Initial import

1 files changed, 1550 insertions, 0 deletions

diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
new file mode 100644
index 000000000..53b7acde9
--- /dev/null
+++ b/net/sctp/protocol.c
@@ -0,0 +1,1550 @@
+/* SCTP kernel implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ * Copyright (c) 2001 Nokia, Inc.
+ * Copyright (c) 2001 La Monte H.P. Yarroll
+ *
+ * This file is part of the SCTP kernel implementation
+ *
+ * Initialization/cleanup for SCTP protocol support.
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <linux-sctp@vger.kernel.org>
+ *
+ * Written or modified by:
+ *    La Monte H.P. Yarroll <piggy@acm.org>
+ *    Karl Knutson <karl@athena.chicago.il.us>
+ *    Jon Grimm <jgrimm@us.ibm.com>
+ *    Sridhar Samudrala <sri@us.ibm.com>
+ *    Daisy Chang <daisyc@us.ibm.com>
+ *    Ardelle Fan <ardelle.fan@intel.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/seq_file.h>
+#include <linux/bootmem.h>
+#include <linux/highmem.h>
+#include <linux/swap.h>
+#include <linux/slab.h>
+#include <net/net_namespace.h>
+#include <net/protocol.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/route.h>
+#include <net/sctp/sctp.h>
+#include <net/addrconf.h>
+#include <net/inet_common.h>
+#include <net/inet_ecn.h>
+
+/* Global data structures. */
+struct sctp_globals sctp_globals __read_mostly;
+
+struct idr sctp_assocs_id;
+DEFINE_SPINLOCK(sctp_assocs_id_lock);
+
+static struct sctp_pf *sctp_pf_inet6_specific;
+static struct sctp_pf *sctp_pf_inet_specific;
+static struct sctp_af *sctp_af_v4_specific;
+static struct sctp_af *sctp_af_v6_specific;
+
+struct kmem_cache *sctp_chunk_cachep __read_mostly;
+struct kmem_cache *sctp_bucket_cachep __read_mostly;
+
+long sysctl_sctp_mem[3];
+int sysctl_sctp_rmem[3];
+int sysctl_sctp_wmem[3];
+
+/* Set up the proc fs entry for the SCTP protocol. */
+static int __net_init sctp_proc_init(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+	net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
+	if (!net->sctp.proc_net_sctp)
+		goto out_proc_net_sctp;
+	if (sctp_snmp_proc_init(net))
+		goto out_snmp_proc_init;
+	if (sctp_eps_proc_init(net))
+		goto out_eps_proc_init;
+	if (sctp_assocs_proc_init(net))
+		goto out_assocs_proc_init;
+	if (sctp_remaddr_proc_init(net))
+		goto out_remaddr_proc_init;
+
+	return 0;
+
+out_remaddr_proc_init:
+	sctp_assocs_proc_exit(net);
+out_assocs_proc_init:
+	sctp_eps_proc_exit(net);
+out_eps_proc_init:
+	sctp_snmp_proc_exit(net);
+out_snmp_proc_init:
+	remove_proc_entry("sctp", net->proc_net);
+	net->sctp.proc_net_sctp = NULL;
+out_proc_net_sctp:
+	return -ENOMEM;
+#endif /* CONFIG_PROC_FS */
+	return 0;
+}
+
+/* Clean up the proc fs entry for the SCTP protocol.
+ * Note: Do not make this __exit as it is used in the init error
+ * path.
+ */
+static void sctp_proc_exit(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+	sctp_snmp_proc_exit(net);
+	sctp_eps_proc_exit(net);
+	sctp_assocs_proc_exit(net);
+	sctp_remaddr_proc_exit(net);
+
+	remove_proc_entry("sctp", net->proc_net);
+	net->sctp.proc_net_sctp = NULL;
+#endif
+}
+
+/* Private helper to extract ipv4 address and stash them in
+ * the protocol structure.
+ */
+static void sctp_v4_copy_addrlist(struct list_head *addrlist,
+				  struct net_device *dev)
+{
+	struct in_device *in_dev;
+	struct in_ifaddr *ifa;
+	struct sctp_sockaddr_entry *addr;
+
+	rcu_read_lock();
+	if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
+		rcu_read_unlock();
+		return;
+	}
+
+	for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
+		/* Add the address to the local list.  */
+		addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
+		if (addr) {
+			addr->a.v4.sin_family = AF_INET;
+			addr->a.v4.sin_port = 0;
+			addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
+			addr->valid = 1;
+			INIT_LIST_HEAD(&addr->list);
+			list_add_tail(&addr->list, addrlist);
+		}
+	}
+
+	rcu_read_unlock();
+}
+
+/* Extract our IP addresses from the system and stash them in the
+ * protocol structure.
+ */
+static void sctp_get_local_addr_list(struct net *net)
+{
+	struct net_device *dev;
+	struct list_head *pos;
+	struct sctp_af *af;
+
+	rcu_read_lock();
+	for_each_netdev_rcu(net, dev) {
+		list_for_each(pos, &sctp_address_families) {
+			af = list_entry(pos, struct sctp_af, list);
+			af->copy_addrlist(&net->sctp.local_addr_list, dev);
+		}
+	}
+	rcu_read_unlock();
+}
+
+/* Free the existing local addresses.  */
+static void sctp_free_local_addr_list(struct net *net)
+{
+	struct sctp_sockaddr_entry *addr;
+	struct list_head *pos, *temp;
+
+	list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
+		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
+		list_del(pos);
+		kfree(addr);
+	}
+}
+
+/* Copy the local addresses which are valid for 'scope' into 'bp'.  */
+int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
+			      sctp_scope_t scope, gfp_t gfp, int copy_flags)
+{
+	struct sctp_sockaddr_entry *addr;
+	int error = 0;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
+		if (!addr->valid)
+			continue;
+		if (sctp_in_scope(net, &addr->a, scope)) {
+			/* Now that the address is in scope, check to see if
+			 * the address type is really supported by the local
+			 * sock as well as the remote peer.
+			 */
+			if ((((AF_INET == addr->a.sa.sa_family) &&
+			      (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
+			    (((AF_INET6 == addr->a.sa.sa_family) &&
+			      (copy_flags & SCTP_ADDR6_ALLOWED) &&
+			      (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
+				error = sctp_add_bind_addr(bp, &addr->a,
+						    SCTP_ADDR_SRC, GFP_ATOMIC);
+				if (error)
+					goto end_copy;
+			}
+		}
+	}
+
+end_copy:
+	rcu_read_unlock();
+	return error;
+}
+
+/* Initialize a sctp_addr from in incoming skb.  */
+static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
+			     int is_saddr)
+{
+	void *from;
+	__be16 *port;
+	struct sctphdr *sh;
+
+	port = &addr->v4.sin_port;
+	addr->v4.sin_family = AF_INET;
+
+	sh = sctp_hdr(skb);
+	if (is_saddr) {
+		*port  = sh->source;
+		from = &ip_hdr(skb)->saddr;
+	} else {
+		*port = sh->dest;
+		from = &ip_hdr(skb)->daddr;
+	}
+	memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
+}
+
+/* Initialize an sctp_addr from a socket. */
+static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
+{
+	addr->v4.sin_family = AF_INET;
+	addr->v4.sin_port = 0;
+	addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
+}
+
+/* Initialize sk->sk_rcv_saddr from sctp_addr. */
+static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
+{
+	inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
+}
+
+/* Initialize sk->sk_daddr from sctp_addr. */
+static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
+{
+	inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
+}
+
+/* Initialize a sctp_addr from an address parameter. */
+static void sctp_v4_from_addr_param(union sctp_addr *addr,
+				    union sctp_addr_param *param,
+				    __be16 port, int iif)
+{
+	addr->v4.sin_family = AF_INET;
+	addr->v4.sin_port = port;
+	addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
+}
+
+/* Initialize an address parameter from a sctp_addr and return the length
+ * of the address parameter.
+ */
+static int sctp_v4_to_addr_param(const union sctp_addr *addr,
+				 union sctp_addr_param *param)
+{
+	int length = sizeof(sctp_ipv4addr_param_t);
+
+	param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
+	param->v4.param_hdr.length = htons(length);
+	param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
+
+	return length;
+}
+
+/* Initialize a sctp_addr from a dst_entry. */
+static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
+			      __be16 port)
+{
+	saddr->v4.sin_family = AF_INET;
+	saddr->v4.sin_port = port;
+	saddr->v4.sin_addr.s_addr = fl4->saddr;
+}
+
+/* Compare two addresses exactly. */
+static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
+			    const union sctp_addr *addr2)
+{
+	if (addr1->sa.sa_family != addr2->sa.sa_family)
+		return 0;
+	if (addr1->v4.sin_port != addr2->v4.sin_port)
+		return 0;
+	if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
+		return 0;
+
+	return 1;
+}
+
+/* Initialize addr struct to INADDR_ANY. */
+static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
+{
+	addr->v4.sin_family = AF_INET;
+	addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
+	addr->v4.sin_port = port;
+}
+
+/* Is this a wildcard address? */
+static int sctp_v4_is_any(const union sctp_addr *addr)
+{
+	return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
+}
+
+/* This function checks if the address is a valid address to be used for
+ * SCTP binding.
+ *
+ * Output:
+ * Return 0 - If the address is a non-unicast or an illegal address.
+ * Return 1 - If the address is a unicast.
+ */
+static int sctp_v4_addr_valid(union sctp_addr *addr,
+			      struct sctp_sock *sp,
+			      const struct sk_buff *skb)
+{
+	/* IPv4 addresses not allowed */
+	if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
+		return 0;
+
+	/* Is this a non-unicast address or a unusable SCTP address? */
+	if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
+		return 0;
+
+	/* Is this a broadcast address? */
+	if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
+		return 0;
+
+	return 1;
+}
+
+/* Should this be available for binding?   */
+static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
+{
+	struct net *net = sock_net(&sp->inet.sk);
+	int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
+
+
+	if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
+	   ret != RTN_LOCAL &&
+	   !sp->inet.freebind &&
+	   !net->ipv4.sysctl_ip_nonlocal_bind)
+		return 0;
+
+	if (ipv6_only_sock(sctp_opt2sk(sp)))
+		return 0;
+
+	return 1;
+}
+
+/* Checking the loopback, private and other address scopes as defined in
+ * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
+ * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
+ *
+ * Level 0 - unusable SCTP addresses
+ * Level 1 - loopback address
+ * Level 2 - link-local addresses
+ * Level 3 - private addresses.
+ * Level 4 - global addresses
+ * For INIT and INIT-ACK address list, let L be the level of
+ * of requested destination address, sender and receiver
+ * SHOULD include all of its addresses with level greater
+ * than or equal to L.
+ *
+ * IPv4 scoping can be controlled through sysctl option
+ * net.sctp.addr_scope_policy
+ */
+static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
+{
+	sctp_scope_t retval;
+
+	/* Check for unusable SCTP addresses. */
+	if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
+		retval =  SCTP_SCOPE_UNUSABLE;
+	} else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
+		retval = SCTP_SCOPE_LOOPBACK;
+	} else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
+		retval = SCTP_SCOPE_LINK;
+	} else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
+		   ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
+		   ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
+		retval = SCTP_SCOPE_PRIVATE;
+	} else {
+		retval = SCTP_SCOPE_GLOBAL;
+	}
+
+	return retval;
+}
+
+/* Returns a valid dst cache entry for the given source and destination ip
+ * addresses. If an association is passed, trys to get a dst entry with a
+ * source address that matches an address in the bind address list.
+ */
+static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
+				struct flowi *fl, struct sock *sk)
+{
+	struct sctp_association *asoc = t->asoc;
+	struct rtable *rt;
+	struct flowi4 *fl4 = &fl->u.ip4;
+	struct sctp_bind_addr *bp;
+	struct sctp_sockaddr_entry *laddr;
+	struct dst_entry *dst = NULL;
+	union sctp_addr *daddr = &t->ipaddr;
+	union sctp_addr dst_saddr;
+
+	memset(fl4, 0x0, sizeof(struct flowi4));
+	fl4->daddr  = daddr->v4.sin_addr.s_addr;
+	fl4->fl4_dport = daddr->v4.sin_port;
+	fl4->flowi4_proto = IPPROTO_SCTP;
+	if (asoc) {
+		fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
+		fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
+		fl4->fl4_sport = htons(asoc->base.bind_addr.port);
+	}
+	if (saddr) {
+		fl4->saddr = saddr->v4.sin_addr.s_addr;
+		fl4->fl4_sport = saddr->v4.sin_port;
+	}
+
+	pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
+		 &fl4->saddr);
+
+	rt = ip_route_output_key(sock_net(sk), fl4);
+	if (!IS_ERR(rt))
+		dst = &rt->dst;
+
+	/* If there is no association or if a source address is passed, no
+	 * more validation is required.
+	 */
+	if (!asoc || saddr)
+		goto out;
+
+	bp = &asoc->base.bind_addr;
+
+	if (dst) {
+		/* Walk through the bind address list and look for a bind
+		 * address that matches the source address of the returned dst.
+		 */
+		sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
+		rcu_read_lock();
+		list_for_each_entry_rcu(laddr, &bp->address_list, list) {
+			if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
+			    (laddr->state != SCTP_ADDR_SRC &&
+			    !asoc->src_out_of_asoc_ok))
+				continue;
+			if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
+				goto out_unlock;
+		}
+		rcu_read_unlock();
+
+		/* None of the bound addresses match the source address of the
+		 * dst. So release it.
+		 */
+		dst_release(dst);
+		dst = NULL;
+	}
+
+	/* Walk through the bind address list and try to get a dst that
+	 * matches a bind address as the source address.
+	 */
+	rcu_read_lock();
+	list_for_each_entry_rcu(laddr, &bp->address_list, list) {
+		if (!laddr->valid)
+			continue;
+		if ((laddr->state == SCTP_ADDR_SRC) &&
+		    (AF_INET == laddr->a.sa.sa_family)) {
+			fl4->fl4_sport = laddr->a.v4.sin_port;
+			flowi4_update_output(fl4,
+					     asoc->base.sk->sk_bound_dev_if,
+					     RT_CONN_FLAGS(asoc->base.sk),
+					     daddr->v4.sin_addr.s_addr,
+					     laddr->a.v4.sin_addr.s_addr);
+
+			rt = ip_route_output_key(sock_net(sk), fl4);
+			if (!IS_ERR(rt)) {
+				dst = &rt->dst;
+				goto out_unlock;
+			}
+		}
+	}
+
+out_unlock:
+	rcu_read_unlock();
+out:
+	t->dst = dst;
+	if (dst)
+		pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
+			 &fl4->daddr, &fl4->saddr);
+	else
+		pr_debug("no route\n");
+}
+
+/* For v4, the source address is cached in the route entry(dst). So no need
+ * to cache it separately and hence this is an empty routine.
+ */
+static void sctp_v4_get_saddr(struct sctp_sock *sk,
+			      struct sctp_transport *t,
+			      struct flowi *fl)
+{
+	union sctp_addr *saddr = &t->saddr;
+	struct rtable *rt = (struct rtable *)t->dst;
+
+	if (rt) {
+		saddr->v4.sin_family = AF_INET;
+		saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
+	}
+}
+
+/* What interface did this skb arrive on? */
+static int sctp_v4_skb_iif(const struct sk_buff *skb)
+{
+	return inet_iif(skb);
+}
+
+/* Was this packet marked by Explicit Congestion Notification? */
+static int sctp_v4_is_ce(const struct sk_buff *skb)
+{
+	return INET_ECN_is_ce(ip_hdr(skb)->tos);
+}
+
+/* Create and initialize a new sk for the socket returned by accept(). */
+static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
+					     struct sctp_association *asoc)
+{
+	struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
+			sk->sk_prot);
+	struct inet_sock *newinet;
+
+	if (!newsk)
+		goto out;
+
+	sock_init_data(NULL, newsk);
+
+	sctp_copy_sock(newsk, sk, asoc);
+	sock_reset_flag(newsk, SOCK_ZAPPED);
+
+	newinet = inet_sk(newsk);
+
+	newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
+
+	sk_refcnt_debug_inc(newsk);
+
+	if (newsk->sk_prot->init(newsk)) {
+		sk_common_release(newsk);
+		newsk = NULL;
+	}
+
+out:
+	return newsk;
+}
+
+static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
+{
+	/* No address mapping for V4 sockets */
+	return sizeof(struct sockaddr_in);
+}
+
+/* Dump the v4 addr to the seq file. */
+static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
+{
+	seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
+}
+
+static void sctp_v4_ecn_capable(struct sock *sk)
+{
+	INET_ECN_xmit(sk);
+}
+
+static void sctp_addr_wq_timeout_handler(unsigned long arg)
+{
+	struct net *net = (struct net *)arg;
+	struct sctp_sockaddr_entry *addrw, *temp;
+	struct sctp_sock *sp;
+
+	spin_lock_bh(&net->sctp.addr_wq_lock);
+
+	list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
+		pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
+			 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
+			 addrw->state, addrw);
+
+#if IS_ENABLED(CONFIG_IPV6)
+		/* Now we send an ASCONF for each association */
+		/* Note. we currently don't handle link local IPv6 addressees */
+		if (addrw->a.sa.sa_family == AF_INET6) {
+			struct in6_addr *in6;
+
+			if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
+			    IPV6_ADDR_LINKLOCAL)
+				goto free_next;
+
+			in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
+			if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
+			    addrw->state == SCTP_ADDR_NEW) {
+				unsigned long timeo_val;
+
+				pr_debug("%s: this is on DAD, trying %d sec "
+					 "later\n", __func__,
+					 SCTP_ADDRESS_TICK_DELAY);
+
+				timeo_val = jiffies;
+				timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
+				mod_timer(&net->sctp.addr_wq_timer, timeo_val);
+				break;
+			}
+		}
+#endif
+		list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
+			struct sock *sk;
+
+			sk = sctp_opt2sk(sp);
+			/* ignore bound-specific endpoints */
+			if (!sctp_is_ep_boundall(sk))
+				continue;
+			bh_lock_sock(sk);
+			if (sctp_asconf_mgmt(sp, addrw) < 0)
+				pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
+			bh_unlock_sock(sk);
+		}
+#if IS_ENABLED(CONFIG_IPV6)
+free_next:
+#endif
+		list_del(&addrw->list);
+		kfree(addrw);
+	}
+	spin_unlock_bh(&net->sctp.addr_wq_lock);
+}
+
+static void sctp_free_addr_wq(struct net *net)
+{
+	struct sctp_sockaddr_entry *addrw;
+	struct sctp_sockaddr_entry *temp;
+
+	spin_lock_bh(&net->sctp.addr_wq_lock);
+	del_timer(&net->sctp.addr_wq_timer);
+	list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
+		list_del(&addrw->list);
+		kfree(addrw);
+	}
+	spin_unlock_bh(&net->sctp.addr_wq_lock);
+}
+
+/* lookup the entry for the same address in the addr_waitq
+ * sctp_addr_wq MUST be locked
+ */
+static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
+					struct sctp_sockaddr_entry *addr)
+{
+	struct sctp_sockaddr_entry *addrw;
+
+	list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
+		if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
+			continue;
+		if (addrw->a.sa.sa_family == AF_INET) {
+			if (addrw->a.v4.sin_addr.s_addr ==
+			    addr->a.v4.sin_addr.s_addr)
+				return addrw;
+		} else if (addrw->a.sa.sa_family == AF_INET6) {
+			if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
+			    &addr->a.v6.sin6_addr))
+				return addrw;
+		}
+	}
+	return NULL;
+}
+
+void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
+{
+	struct sctp_sockaddr_entry *addrw;
+	unsigned long timeo_val;
+
+	/* first, we check if an opposite message already exist in the queue.
+	 * If we found such message, it is removed.
+	 * This operation is a bit stupid, but the DHCP client attaches the
+	 * new address after a couple of addition and deletion of that address
+	 */
+
+	spin_lock_bh(&net->sctp.addr_wq_lock);
+	/* Offsets existing events in addr_wq */
+	addrw = sctp_addr_wq_lookup(net, addr);
+	if (addrw) {
+		if (addrw->state != cmd) {
+			pr_debug("%s: offsets existing entry for %d, addr:%pISc "
+				 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
+				 &net->sctp.addr_waitq);
+
+			list_del(&addrw->list);
+			kfree(addrw);
+		}
+		spin_unlock_bh(&net->sctp.addr_wq_lock);
+		return;
+	}
+
+	/* OK, we have to add the new address to the wait queue */
+	addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
+	if (addrw == NULL) {
+		spin_unlock_bh(&net->sctp.addr_wq_lock);
+		return;
+	}
+	addrw->state = cmd;
+	list_add_tail(&addrw->list, &net->sctp.addr_waitq);
+
+	pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
+		 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
+
+	if (!timer_pending(&net->sctp.addr_wq_timer)) {
+		timeo_val = jiffies;
+		timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
+		mod_timer(&net->sctp.addr_wq_timer, timeo_val);
+	}
+	spin_unlock_bh(&net->sctp.addr_wq_lock);
+}
+
+/* Event handler for inet address addition/deletion events.
+ * The sctp_local_addr_list needs to be protocted by a spin lock since
+ * multiple notifiers (say IPv4 and IPv6) may be running at the same
+ * time and thus corrupt the list.
+ * The reader side is protected with RCU.
+ */
+static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
+			       void *ptr)
+{
+	struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
+	struct sctp_sockaddr_entry *addr = NULL;
+	struct sctp_sockaddr_entry *temp;
+	struct net *net = dev_net(ifa->ifa_dev->dev);
+	int found = 0;
+
+	switch (ev) {
+	case NETDEV_UP:
+		addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
+		if (addr) {
+			addr->a.v4.sin_family = AF_INET;
+			addr->a.v4.sin_port = 0;
+			addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
+			addr->valid = 1;
+			spin_lock_bh(&net->sctp.local_addr_lock);
+			list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
+			sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
+			spin_unlock_bh(&net->sctp.local_addr_lock);
+		}
+		break;
+	case NETDEV_DOWN:
+		spin_lock_bh(&net->sctp.local_addr_lock);
+		list_for_each_entry_safe(addr, temp,
+					&net->sctp.local_addr_list, list) {
+			if (addr->a.sa.sa_family == AF_INET &&
+					addr->a.v4.sin_addr.s_addr ==
+					ifa->ifa_local) {
+				sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
+				found = 1;
+				addr->valid = 0;
+				list_del_rcu(&addr->list);
+				break;
+			}
+		}
+		spin_unlock_bh(&net->sctp.local_addr_lock);
+		if (found)
+			kfree_rcu(addr, rcu);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+/*
+ * Initialize the control inode/socket with a control endpoint data
+ * structure.  This endpoint is reserved exclusively for the OOTB processing.
+ */
+static int sctp_ctl_sock_init(struct net *net)
+{
+	int err;
+	sa_family_t family = PF_INET;
+
+	if (sctp_get_pf_specific(PF_INET6))
+		family = PF_INET6;
+
+	err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
+				   SOCK_SEQPACKET, IPPROTO_SCTP, net);
+
+	/* If IPv6 socket could not be created, try the IPv4 socket */
+	if (err < 0 && family == PF_INET6)
+		err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
+					   SOCK_SEQPACKET, IPPROTO_SCTP,
+					   net);
+
+	if (err < 0) {
+		pr_err("Failed to create the SCTP control socket\n");
+		return err;
+	}
+	return 0;
+}
+
+/* Register address family specific functions. */
+int sctp_register_af(struct sctp_af *af)
+{
+	switch (af->sa_family) {
+	case AF_INET:
+		if (sctp_af_v4_specific)
+			return 0;
+		sctp_af_v4_specific = af;
+		break;
+	case AF_INET6:
+		if (sctp_af_v6_specific)
+			return 0;
+		sctp_af_v6_specific = af;
+		break;
+	default:
+		return 0;
+	}
+
+	INIT_LIST_HEAD(&af->list);
+	list_add_tail(&af->list, &sctp_address_families);
+	return 1;
+}
+
+/* Get the table of functions for manipulating a particular address
+ * family.
+ */
+struct sctp_af *sctp_get_af_specific(sa_family_t family)
+{
+	switch (family) {
+	case AF_INET:
+		return sctp_af_v4_specific;
+	case AF_INET6:
+		return sctp_af_v6_specific;
+	default:
+		return NULL;
+	}
+}
+
+/* Common code to initialize a AF_INET msg_name. */
+static void sctp_inet_msgname(char *msgname, int *addr_len)
+{
+	struct sockaddr_in *sin;
+
+	sin = (struct sockaddr_in *)msgname;
+	*addr_len = sizeof(struct sockaddr_in);
+	sin->sin_family = AF_INET;
+	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+}
+
+/* Copy the primary address of the peer primary address as the msg_name. */
+static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
+				    int *addr_len)
+{
+	struct sockaddr_in *sin, *sinfrom;
+
+	if (msgname) {
+		struct sctp_association *asoc;
+
+		asoc = event->asoc;
+		sctp_inet_msgname(msgname, addr_len);
+		sin = (struct sockaddr_in *)msgname;
+		sinfrom = &asoc->peer.primary_addr.v4;
+		sin->sin_port = htons(asoc->peer.port);
+		sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
+	}
+}
+
+/* Initialize and copy out a msgname from an inbound skb. */
+static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
+{
+	if (msgname) {
+		struct sctphdr *sh = sctp_hdr(skb);
+		struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
+
+		sctp_inet_msgname(msgname, len);
+		sin->sin_port = sh->source;
+		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
+	}
+}
+
+/* Do we support this AF? */
+static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
+{
+	/* PF_INET only supports AF_INET addresses. */
+	return AF_INET == family;
+}
+
+/* Address matching with wildcards allowed. */
+static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
+			      const union sctp_addr *addr2,
+			      struct sctp_sock *opt)
+{
+	/* PF_INET only supports AF_INET addresses. */
+	if (addr1->sa.sa_family != addr2->sa.sa_family)
+		return 0;
+	if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
+	    htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
+		return 1;
+	if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
+		return 1;
+
+	return 0;
+}
+
+/* Verify that provided sockaddr looks bindable.  Common verification has
+ * already been taken care of.
+ */
+static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
+{
+	return sctp_v4_available(addr, opt);
+}
+
+/* Verify that sockaddr looks sendable.  Common verification has already
+ * been taken care of.
+ */
+static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
+{
+	return 1;
+}
+
+/* Fill in Supported Address Type information for INIT and INIT-ACK
+ * chunks.  Returns number of addresses supported.
+ */
+static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
+				     __be16 *types)
+{
+	types[0] = SCTP_PARAM_IPV4_ADDRESS;
+	return 1;
+}
+
+/* Wrapper routine that calls the ip transmit routine. */
+static inline int sctp_v4_xmit(struct sk_buff *skb,
+			       struct sctp_transport *transport)
+{
+	struct inet_sock *inet = inet_sk(skb->sk);
+
+	pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
+		 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
+
+	inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
+			 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
+
+	SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
+
+	return ip_queue_xmit(&inet->sk, skb, &transport->fl);
+}
+
+static struct sctp_af sctp_af_inet;
+
+static struct sctp_pf sctp_pf_inet = {
+	.event_msgname = sctp_inet_event_msgname,
+	.skb_msgname   = sctp_inet_skb_msgname,
+	.af_supported  = sctp_inet_af_supported,
+	.cmp_addr      = sctp_inet_cmp_addr,
+	.bind_verify   = sctp_inet_bind_verify,
+	.send_verify   = sctp_inet_send_verify,
+	.supported_addrs = sctp_inet_supported_addrs,
+	.create_accept_sk = sctp_v4_create_accept_sk,
+	.addr_to_user  = sctp_v4_addr_to_user,
+	.to_sk_saddr   = sctp_v4_to_sk_saddr,
+	.to_sk_daddr   = sctp_v4_to_sk_daddr,
+	.af            = &sctp_af_inet
+};
+
+/* Notifier for inetaddr addition/deletion events.  */
+static struct notifier_block sctp_inetaddr_notifier = {
+	.notifier_call = sctp_inetaddr_event,
+};
+
+/* Socket operations.  */
+static const struct proto_ops inet_seqpacket_ops = {
+	.family		   = PF_INET,
+	.owner		   = THIS_MODULE,
+	.release	   = inet_release,	/* Needs to be wrapped... */
+	.bind		   = inet_bind,
+	.connect	   = inet_dgram_connect,
+	.socketpair	   = sock_no_socketpair,
+	.accept		   = inet_accept,
+	.getname	   = inet_getname,	/* Semantics are different.  */
+	.poll		   = sctp_poll,
+	.ioctl		   = inet_ioctl,
+	.listen		   = sctp_inet_listen,
+	.shutdown	   = inet_shutdown,	/* Looks harmless.  */
+	.setsockopt	   = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
+	.getsockopt	   = sock_common_getsockopt,
+	.sendmsg	   = inet_sendmsg,
+	.recvmsg	   = sock_common_recvmsg,
+	.mmap		   = sock_no_mmap,
+	.sendpage	   = sock_no_sendpage,
+#ifdef CONFIG_COMPAT
+	.compat_setsockopt = compat_sock_common_setsockopt,
+	.compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+};
+
+/* Registration with AF_INET family.  */
+static struct inet_protosw sctp_seqpacket_protosw = {
+	.type       = SOCK_SEQPACKET,
+	.protocol   = IPPROTO_SCTP,
+	.prot       = &sctp_prot,
+	.ops        = &inet_seqpacket_ops,
+	.flags      = SCTP_PROTOSW_FLAG
+};
+static struct inet_protosw sctp_stream_protosw = {
+	.type       = SOCK_STREAM,
+	.protocol   = IPPROTO_SCTP,
+	.prot       = &sctp_prot,
+	.ops        = &inet_seqpacket_ops,
+	.flags      = SCTP_PROTOSW_FLAG
+};
+
+/* Register with IP layer.  */
+static const struct net_protocol sctp_protocol = {
+	.handler     = sctp_rcv,
+	.err_handler = sctp_v4_err,
+	.no_policy   = 1,
+	.netns_ok    = 1,
+	.icmp_strict_tag_validation = 1,
+};
+
+/* IPv4 address related functions.  */
+static struct sctp_af sctp_af_inet = {
+	.sa_family	   = AF_INET,
+	.sctp_xmit	   = sctp_v4_xmit,
+	.setsockopt	   = ip_setsockopt,
+	.getsockopt	   = ip_getsockopt,
+	.get_dst	   = sctp_v4_get_dst,
+	.get_saddr	   = sctp_v4_get_saddr,
+	.copy_addrlist	   = sctp_v4_copy_addrlist,
+	.from_skb	   = sctp_v4_from_skb,
+	.from_sk	   = sctp_v4_from_sk,
+	.from_addr_param   = sctp_v4_from_addr_param,
+	.to_addr_param	   = sctp_v4_to_addr_param,
+	.cmp_addr	   = sctp_v4_cmp_addr,
+	.addr_valid	   = sctp_v4_addr_valid,
+	.inaddr_any	   = sctp_v4_inaddr_any,
+	.is_any		   = sctp_v4_is_any,
+	.available	   = sctp_v4_available,
+	.scope		   = sctp_v4_scope,
+	.skb_iif	   = sctp_v4_skb_iif,
+	.is_ce		   = sctp_v4_is_ce,
+	.seq_dump_addr	   = sctp_v4_seq_dump_addr,
+	.ecn_capable	   = sctp_v4_ecn_capable,
+	.net_header_len	   = sizeof(struct iphdr),
+	.sockaddr_len	   = sizeof(struct sockaddr_in),
+#ifdef CONFIG_COMPAT
+	.compat_setsockopt = compat_ip_setsockopt,
+	.compat_getsockopt = compat_ip_getsockopt,
+#endif
+};
+
+struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
+{
+	switch (family) {
+	case PF_INET:
+		return sctp_pf_inet_specific;
+	case PF_INET6:
+		return sctp_pf_inet6_specific;
+	default:
+		return NULL;
+	}
+}
+
+/* Register the PF specific function table.  */
+int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
+{
+	switch (family) {
+	case PF_INET:
+		if (sctp_pf_inet_specific)
+			return 0;
+		sctp_pf_inet_specific = pf;
+		break;
+	case PF_INET6:
+		if (sctp_pf_inet6_specific)
+			return 0;
+		sctp_pf_inet6_specific = pf;
+		break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static inline int init_sctp_mibs(struct net *net)
+{
+	net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
+	if (!net->sctp.sctp_statistics)
+		return -ENOMEM;
+	return 0;
+}
+
+static inline void cleanup_sctp_mibs(struct net *net)
+{
+	free_percpu(net->sctp.sctp_statistics);
+}
+
+static void sctp_v4_pf_init(void)
+{
+	/* Initialize the SCTP specific PF functions. */
+	sctp_register_pf(&sctp_pf_inet, PF_INET);
+	sctp_register_af(&sctp_af_inet);
+}
+
+static void sctp_v4_pf_exit(void)
+{
+	list_del(&sctp_af_inet.list);
+}
+
+static int sctp_v4_protosw_init(void)
+{
+	int rc;
+
+	rc = proto_register(&sctp_prot, 1);
+	if (rc)
+		return rc;
+
+	/* Register SCTP(UDP and TCP style) with socket layer.  */
+	inet_register_protosw(&sctp_seqpacket_protosw);
+	inet_register_protosw(&sctp_stream_protosw);
+
+	return 0;
+}
+
+static void sctp_v4_protosw_exit(void)
+{
+	inet_unregister_protosw(&sctp_stream_protosw);
+	inet_unregister_protosw(&sctp_seqpacket_protosw);
+	proto_unregister(&sctp_prot);
+}
+
+static int sctp_v4_add_protocol(void)
+{
+	/* Register notifier for inet address additions/deletions. */
+	register_inetaddr_notifier(&sctp_inetaddr_notifier);
+
+	/* Register SCTP with inet layer.  */
+	if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
+		return -EAGAIN;
+
+	return 0;
+}
+
+static void sctp_v4_del_protocol(void)
+{
+	inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
+	unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
+}
+
+static int __net_init sctp_net_init(struct net *net)
+{
+	int status;
+
+	/*
+	 * 14. Suggested SCTP Protocol Parameter Values
+	 */
+	/* The following protocol parameters are RECOMMENDED:  */
+	/* RTO.Initial              - 3  seconds */
+	net->sctp.rto_initial			= SCTP_RTO_INITIAL;
+	/* RTO.Min                  - 1  second */
+	net->sctp.rto_min	 		= SCTP_RTO_MIN;
+	/* RTO.Max                 -  60 seconds */
+	net->sctp.rto_max 			= SCTP_RTO_MAX;
+	/* RTO.Alpha                - 1/8 */
+	net->sctp.rto_alpha			= SCTP_RTO_ALPHA;
+	/* RTO.Beta                 - 1/4 */
+	net->sctp.rto_beta			= SCTP_RTO_BETA;
+
+	/* Valid.Cookie.Life        - 60  seconds */
+	net->sctp.valid_cookie_life		= SCTP_DEFAULT_COOKIE_LIFE;
+
+	/* Whether Cookie Preservative is enabled(1) or not(0) */
+	net->sctp.cookie_preserve_enable 	= 1;
+
+	/* Default sctp sockets to use md5 as their hmac alg */
+#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
+	net->sctp.sctp_hmac_alg			= "md5";
+#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
+	net->sctp.sctp_hmac_alg			= "sha1";
+#else
+	net->sctp.sctp_hmac_alg			= NULL;
+#endif
+
+	/* Max.Burst		    - 4 */
+	net->sctp.max_burst			= SCTP_DEFAULT_MAX_BURST;
+
+	/* Association.Max.Retrans  - 10 attempts
+	 * Path.Max.Retrans         - 5  attempts (per destination address)
+	 * Max.Init.Retransmits     - 8  attempts
+	 */
+	net->sctp.max_retrans_association	= 10;
+	net->sctp.max_retrans_path		= 5;
+	net->sctp.max_retrans_init		= 8;
+
+	/* Sendbuffer growth	    - do per-socket accounting */
+	net->sctp.sndbuf_policy			= 0;
+
+	/* Rcvbuffer growth	    - do per-socket accounting */
+	net->sctp.rcvbuf_policy			= 0;
+
+	/* HB.interval              - 30 seconds */
+	net->sctp.hb_interval			= SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
+
+	/* delayed SACK timeout */
+	net->sctp.sack_timeout			= SCTP_DEFAULT_TIMEOUT_SACK;
+
+	/* Disable ADDIP by default. */
+	net->sctp.addip_enable = 0;
+	net->sctp.addip_noauth = 0;
+	net->sctp.default_auto_asconf = 0;
+
+	/* Enable PR-SCTP by default. */
+	net->sctp.prsctp_enable = 1;
+
+	/* Disable AUTH by default. */
+	net->sctp.auth_enable = 0;
+
+	/* Set SCOPE policy to enabled */
+	net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
+
+	/* Set the default rwnd update threshold */
+	net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
+
+	/* Initialize maximum autoclose timeout. */
+	net->sctp.max_autoclose		= INT_MAX / HZ;
+
+	status = sctp_sysctl_net_register(net);
+	if (status)
+		goto err_sysctl_register;
+
+	/* Allocate and initialise sctp mibs.  */
+	status = init_sctp_mibs(net);
+	if (status)
+		goto err_init_mibs;
+
+	/* Initialize proc fs directory.  */
+	status = sctp_proc_init(net);
+	if (status)
+		goto err_init_proc;
+
+	sctp_dbg_objcnt_init(net);
+
+	/* Initialize the control inode/socket for handling OOTB packets.  */
+	if ((status = sctp_ctl_sock_init(net))) {
+		pr_err("Failed to initialize the SCTP control sock\n");
+		goto err_ctl_sock_init;
+	}
+
+	/* Initialize the local address list. */
+	INIT_LIST_HEAD(&net->sctp.local_addr_list);
+	spin_lock_init(&net->sctp.local_addr_lock);
+	sctp_get_local_addr_list(net);
+
+	/* Initialize the address event list */
+	INIT_LIST_HEAD(&net->sctp.addr_waitq);
+	INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
+	spin_lock_init(&net->sctp.addr_wq_lock);
+	net->sctp.addr_wq_timer.expires = 0;
+	setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
+		    (unsigned long)net);
+
+	return 0;
+
+err_ctl_sock_init:
+	sctp_dbg_objcnt_exit(net);
+	sctp_proc_exit(net);
+err_init_proc:
+	cleanup_sctp_mibs(net);
+err_init_mibs:
+	sctp_sysctl_net_unregister(net);
+err_sysctl_register:
+	return status;
+}
+
+static void __net_exit sctp_net_exit(struct net *net)
+{
+	/* Free the local address list */
+	sctp_free_addr_wq(net);
+	sctp_free_local_addr_list(net);
+
+	/* Free the control endpoint.  */
+	inet_ctl_sock_destroy(net->sctp.ctl_sock);
+
+	sctp_dbg_objcnt_exit(net);
+
+	sctp_proc_exit(net);
+	cleanup_sctp_mibs(net);
+	sctp_sysctl_net_unregister(net);
+}
+
+static struct pernet_operations sctp_net_ops = {
+	.init = sctp_net_init,
+	.exit = sctp_net_exit,
+};
+
+/* Initialize the universe into something sensible.  */
+static __init int sctp_init(void)
+{
+	int i;
+	int status = -EINVAL;
+	unsigned long goal;
+	unsigned long limit;
+	int max_share;
+	int order;
+
+	sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
+
+	/* Allocate bind_bucket and chunk caches. */
+	status = -ENOBUFS;
+	sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
+					       sizeof(struct sctp_bind_bucket),
+					       0, SLAB_HWCACHE_ALIGN,
+					       NULL);
+	if (!sctp_bucket_cachep)
+		goto out;
+
+	sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
+					       sizeof(struct sctp_chunk),
+					       0, SLAB_HWCACHE_ALIGN,
+					       NULL);
+	if (!sctp_chunk_cachep)
+		goto err_chunk_cachep;
+
+	status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
+	if (status)
+		goto err_percpu_counter_init;
+
+	/* Implementation specific variables. */
+
+	/* Initialize default stream count setup information. */
+	sctp_max_instreams    		= SCTP_DEFAULT_INSTREAMS;
+	sctp_max_outstreams   		= SCTP_DEFAULT_OUTSTREAMS;
+
+	/* Initialize handle used for association ids. */
+	idr_init(&sctp_assocs_id);
+
+	limit = nr_free_buffer_pages() / 8;
+	limit = max(limit, 128UL);
+	sysctl_sctp_mem[0] = limit / 4 * 3;
+	sysctl_sctp_mem[1] = limit;
+	sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
+
+	/* Set per-socket limits to no more than 1/128 the pressure threshold*/
+	limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
+	max_share = min(4UL*1024*1024, limit);
+
+	sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
+	sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
+	sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
+
+	sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
+	sysctl_sctp_wmem[1] = 16*1024;
+	sysctl_sctp_wmem[2] = max(64*1024, max_share);
+
+	/* Size and allocate the association hash table.
+	 * The methodology is similar to that of the tcp hash tables.
+	 */
+	if (totalram_pages >= (128 * 1024))
+		goal = totalram_pages >> (22 - PAGE_SHIFT);
+	else
+		goal = totalram_pages >> (24 - PAGE_SHIFT);
+
+	for (order = 0; (1UL << order) < goal; order++)
+		;
+
+	do {
+		sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
+					sizeof(struct sctp_hashbucket);
+		if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
+			continue;
+		sctp_assoc_hashtable = (struct sctp_hashbucket *)
+			__get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
+	} while (!sctp_assoc_hashtable && --order > 0);
+	if (!sctp_assoc_hashtable) {
+		pr_err("Failed association hash alloc\n");
+		status = -ENOMEM;
+		goto err_ahash_alloc;
+	}
+	for (i = 0; i < sctp_assoc_hashsize; i++) {
+		rwlock_init(&sctp_assoc_hashtable[i].lock);
+		INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
+	}
+
+	/* Allocate and initialize the endpoint hash table.  */
+	sctp_ep_hashsize = 64;
+	sctp_ep_hashtable =
+		kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
+	if (!sctp_ep_hashtable) {
+		pr_err("Failed endpoint_hash alloc\n");
+		status = -ENOMEM;
+		goto err_ehash_alloc;
+	}
+	for (i = 0; i < sctp_ep_hashsize; i++) {
+		rwlock_init(&sctp_ep_hashtable[i].lock);
+		INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
+	}
+
+	/* Allocate and initialize the SCTP port hash table.  */
+	do {
+		sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
+					sizeof(struct sctp_bind_hashbucket);
+		if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
+			continue;
+		sctp_port_hashtable = (struct sctp_bind_hashbucket *)
+			__get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
+	} while (!sctp_port_hashtable && --order > 0);
+	if (!sctp_port_hashtable) {
+		pr_err("Failed bind hash alloc\n");
+		status = -ENOMEM;
+		goto err_bhash_alloc;
+	}
+	for (i = 0; i < sctp_port_hashsize; i++) {
+		spin_lock_init(&sctp_port_hashtable[i].lock);
+		INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
+	}
+
+	pr_info("Hash tables configured (established %d bind %d)\n",
+		sctp_assoc_hashsize, sctp_port_hashsize);
+
+	sctp_sysctl_register();
+
+	INIT_LIST_HEAD(&sctp_address_families);
+	sctp_v4_pf_init();
+	sctp_v6_pf_init();
+
+	status = sctp_v4_protosw_init();
+
+	if (status)
+		goto err_protosw_init;
+
+	status = sctp_v6_protosw_init();
+	if (status)
+		goto err_v6_protosw_init;
+
+	status = register_pernet_subsys(&sctp_net_ops);
+	if (status)
+		goto err_register_pernet_subsys;
+
+	status = sctp_v4_add_protocol();
+	if (status)
+		goto err_add_protocol;
+
+	/* Register SCTP with inet6 layer.  */
+	status = sctp_v6_add_protocol();
+	if (status)
+		goto err_v6_add_protocol;
+
+out:
+	return status;
+err_v6_add_protocol:
+	sctp_v4_del_protocol();
+err_add_protocol:
+	unregister_pernet_subsys(&sctp_net_ops);
+err_register_pernet_subsys:
+	sctp_v6_protosw_exit();
+err_v6_protosw_init:
+	sctp_v4_protosw_exit();
+err_protosw_init:
+	sctp_v4_pf_exit();
+	sctp_v6_pf_exit();
+	sctp_sysctl_unregister();
+	free_pages((unsigned long)sctp_port_hashtable,
+		   get_order(sctp_port_hashsize *
+			     sizeof(struct sctp_bind_hashbucket)));
+err_bhash_alloc:
+	kfree(sctp_ep_hashtable);
+err_ehash_alloc:
+	free_pages((unsigned long)sctp_assoc_hashtable,
+		   get_order(sctp_assoc_hashsize *
+			     sizeof(struct sctp_hashbucket)));
+err_ahash_alloc:
+	percpu_counter_destroy(&sctp_sockets_allocated);
+err_percpu_counter_init:
+	kmem_cache_destroy(sctp_chunk_cachep);
+err_chunk_cachep:
+	kmem_cache_destroy(sctp_bucket_cachep);
+	goto out;
+}
+
+/* Exit handler for the SCTP protocol.  */
+static __exit void sctp_exit(void)
+{
+	/* BUG.  This should probably do something useful like clean
+	 * up all the remaining associations and all that memory.
+	 */
+
+	/* Unregister with inet6/inet layers. */
+	sctp_v6_del_protocol();
+	sctp_v4_del_protocol();
+
+	unregister_pernet_subsys(&sctp_net_ops);
+
+	/* Free protosw registrations */
+	sctp_v6_protosw_exit();
+	sctp_v4_protosw_exit();
+
+	/* Unregister with socket layer. */
+	sctp_v6_pf_exit();
+	sctp_v4_pf_exit();
+
+	sctp_sysctl_unregister();
+
+	free_pages((unsigned long)sctp_assoc_hashtable,
+		   get_order(sctp_assoc_hashsize *
+			     sizeof(struct sctp_hashbucket)));
+	kfree(sctp_ep_hashtable);
+	free_pages((unsigned long)sctp_port_hashtable,
+		   get_order(sctp_port_hashsize *
+			     sizeof(struct sctp_bind_hashbucket)));
+
+	percpu_counter_destroy(&sctp_sockets_allocated);
+
+	rcu_barrier(); /* Wait for completion of call_rcu()'s */
+
+	kmem_cache_destroy(sctp_chunk_cachep);
+	kmem_cache_destroy(sctp_bucket_cachep);
+}
+
+module_init(sctp_init);
+module_exit(sctp_exit);
+
+/*
+ * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
+ */
+MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
+MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
+MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
+MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
+module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
+MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
+MODULE_LICENSE("GPL");