protocol.c 36.6 KB
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/* SCTP kernel implementation
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 * (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
 *
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 * This file is part of the SCTP kernel implementation
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 *
 * Initialization/cleanup for SCTP protocol support.
 *
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 * This SCTP implementation is free software;
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 * 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.
 *
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 * This SCTP implementation is distributed in the hope that it
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 * 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, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
 *
 * Or submit a bug report through the following website:
 *    http://www.sf.net/projects/lksctp
 *
 * 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>
 *
 * Any bugs reported given to us we will try to fix... any fixes shared will
 * be incorporated into the next SCTP release.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/seq_file.h>
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#include <linux/bootmem.h>
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#include <net/net_namespace.h>
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#include <net/protocol.h>
#include <net/ip.h>
#include <net/ipv6.h>
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#include <net/route.h>
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#include <net/sctp/sctp.h>
#include <net/addrconf.h>
#include <net/inet_common.h>
#include <net/inet_ecn.h>

/* Global data structures. */
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struct sctp_globals sctp_globals __read_mostly;
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struct proc_dir_entry	*proc_net_sctp;
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DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
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struct idr sctp_assocs_id;
DEFINE_SPINLOCK(sctp_assocs_id_lock);

/* This is the global socket data structure used for responding to
 * the Out-of-the-blue (OOTB) packets.  A control sock will be created
 * for this socket at the initialization time.
 */
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static struct sock *sctp_ctl_sock;
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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;

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struct kmem_cache *sctp_chunk_cachep __read_mostly;
struct kmem_cache *sctp_bucket_cachep __read_mostly;
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int sysctl_sctp_mem[3];
int sysctl_sctp_rmem[3];
int sysctl_sctp_wmem[3];
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/* Return the address of the control sock. */
struct sock *sctp_get_ctl_sock(void)
{
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	return sctp_ctl_sock;
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}

/* Set up the proc fs entry for the SCTP protocol. */
static __init int sctp_proc_init(void)
{
	if (!proc_net_sctp) {
		struct proc_dir_entry *ent;
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		ent = proc_mkdir("sctp", init_net.proc_net);
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		if (ent) {
			ent->owner = THIS_MODULE;
			proc_net_sctp = ent;
		} else
			goto out_nomem;
	}

	if (sctp_snmp_proc_init())
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		goto out_snmp_proc_init;
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	if (sctp_eps_proc_init())
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		goto out_eps_proc_init;
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	if (sctp_assocs_proc_init())
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		goto out_assocs_proc_init;
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	if (sctp_remaddr_proc_init())
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		goto out_remaddr_proc_init;
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	return 0;

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out_remaddr_proc_init:
	sctp_remaddr_proc_exit();
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out_assocs_proc_init:
	sctp_eps_proc_exit();
out_eps_proc_init:
	sctp_snmp_proc_exit();
out_snmp_proc_init:
	if (proc_net_sctp) {
		proc_net_sctp = NULL;
		remove_proc_entry("sctp", init_net.proc_net);
	}
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out_nomem:
	return -ENOMEM;
}

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/* Clean up the proc fs entry for the SCTP protocol.
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 * Note: Do not make this __exit as it is used in the init error
 * path.
 */
static void sctp_proc_exit(void)
{
	sctp_snmp_proc_exit();
	sctp_eps_proc_exit();
	sctp_assocs_proc_exit();
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	sctp_remaddr_proc_exit();
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	if (proc_net_sctp) {
		proc_net_sctp = NULL;
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		remove_proc_entry("sctp", init_net.proc_net);
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	}
}

/* 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();
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	if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
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		rcu_read_unlock();
		return;
	}

	for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
		/* Add the address to the local list.  */
		addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
		if (addr) {
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			addr->a.v4.sin_family = AF_INET;
			addr->a.v4.sin_port = 0;
			addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
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			addr->valid = 1;
			INIT_LIST_HEAD(&addr->list);
			INIT_RCU_HEAD(&addr->rcu);
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			list_add_tail(&addr->list, addrlist);
		}
	}

	rcu_read_unlock();
}

/* Extract our IP addresses from the system and stash them in the
 * protocol structure.
 */
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static void sctp_get_local_addr_list(void)
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{
	struct net_device *dev;
	struct list_head *pos;
	struct sctp_af *af;

	read_lock(&dev_base_lock);
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	for_each_netdev(&init_net, dev) {
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		__list_for_each(pos, &sctp_address_families) {
			af = list_entry(pos, struct sctp_af, list);
			af->copy_addrlist(&sctp_local_addr_list, dev);
		}
	}
	read_unlock(&dev_base_lock);
}

/* Free the existing local addresses.  */
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static void sctp_free_local_addr_list(void)
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{
	struct sctp_sockaddr_entry *addr;
	struct list_head *pos, *temp;

	list_for_each_safe(pos, temp, &sctp_local_addr_list) {
		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
		list_del(pos);
		kfree(addr);
	}
}

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void sctp_local_addr_free(struct rcu_head *head)
{
	struct sctp_sockaddr_entry *e = container_of(head,
				struct sctp_sockaddr_entry, rcu);
	kfree(e);
}

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/* Copy the local addresses which are valid for 'scope' into 'bp'.  */
int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
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			      gfp_t gfp, int copy_flags)
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{
	struct sctp_sockaddr_entry *addr;
	int error = 0;

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	rcu_read_lock();
	list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
		if (!addr->valid)
			continue;
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		if (sctp_in_scope(&addr->a, scope)) {
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			/* 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.
			 */
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			if ((((AF_INET == addr->a.sa.sa_family) &&
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			      (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
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			    (((AF_INET6 == addr->a.sa.sa_family) &&
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			      (copy_flags & SCTP_ADDR6_ALLOWED) &&
			      (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
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				error = sctp_add_bind_addr(bp, &addr->a,
						    SCTP_ADDR_SRC, GFP_ATOMIC);
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				if (error)
					goto end_copy;
			}
		}
	}

end_copy:
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	rcu_read_unlock();
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	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;
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	__be16 *port;
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	struct sctphdr *sh;

	port = &addr->v4.sin_port;
	addr->v4.sin_family = AF_INET;

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	sh = sctp_hdr(skb);
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	if (is_saddr) {
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		*port  = sh->source;
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		from = &ip_hdr(skb)->saddr;
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	} else {
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		*port = sh->dest;
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		from = &ip_hdr(skb)->daddr;
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	}
	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;
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	addr->v4.sin_port = 0;
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	addr->v4.sin_addr.s_addr = inet_sk(sk)->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)->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)->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,
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				    __be16 port, int iif)
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{
	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;
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	param->v4.param_hdr.length = htons(length);
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	param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
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	return length;
}

/* Initialize a sctp_addr from a dst_entry. */
static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
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			      __be16 port)
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{
	struct rtable *rt = (struct rtable *)dst;
	saddr->v4.sin_family = AF_INET;
	saddr->v4.sin_port = port;
	saddr->v4.sin_addr.s_addr = rt->rt_src;
}

/* 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. */
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static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
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{
	addr->v4.sin_family = AF_INET;
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	addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
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	addr->v4.sin_port = port;
}

/* Is this a wildcard address? */
static int sctp_v4_is_any(const union sctp_addr *addr)
{
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	return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
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}

/* 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.
 */
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static int sctp_v4_addr_valid(union sctp_addr *addr,
			      struct sctp_sock *sp,
			      const struct sk_buff *skb)
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{
	/* Is this a non-unicast address or a unusable SCTP address? */
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	if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
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		return 0;

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	/* Is this a broadcast address? */
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	if (skb && skb->rtable->rt_flags & RTCF_BROADCAST)
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		return 0;
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	return 1;
}

/* Should this be available for binding?   */
static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
{
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	int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
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	if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
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	   ret != RTN_LOCAL &&
	   !sp->inet.freebind &&
	   !sysctl_ip_nonlocal_bind)
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		return 0;
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	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.
 */
static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
{
	sctp_scope_t retval;

	/* Should IPv4 scoping be a sysctl configurable option
	 * so users can turn it off (default on) for certain
	 * unconventional networking environments?
	 */

	/* Check for unusable SCTP addresses. */
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	if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
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		retval =  SCTP_SCOPE_UNUSABLE;
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	} else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
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		retval = SCTP_SCOPE_LOOPBACK;
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	} else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
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		retval = SCTP_SCOPE_LINK;
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	} 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)) {
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		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 struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
					 union sctp_addr *daddr,
					 union sctp_addr *saddr)
{
	struct rtable *rt;
	struct flowi fl;
	struct sctp_bind_addr *bp;
	struct sctp_sockaddr_entry *laddr;
	struct dst_entry *dst = NULL;
	union sctp_addr dst_saddr;

	memset(&fl, 0x0, sizeof(struct flowi));
	fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
	fl.proto = IPPROTO_SCTP;
	if (asoc) {
		fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
		fl.oif = asoc->base.sk->sk_bound_dev_if;
	}
	if (saddr)
		fl.fl4_src = saddr->v4.sin_addr.s_addr;

	SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
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			  __func__, NIPQUAD(fl.fl4_dst),
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			  NIPQUAD(fl.fl4_src));

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	if (!ip_route_output_key(&init_net, &rt, &fl)) {
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		dst = &rt->u.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.
		 */
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		sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
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		rcu_read_lock();
		list_for_each_entry_rcu(laddr, &bp->address_list, list) {
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			if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
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				continue;
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			if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
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				goto out_unlock;
		}
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		rcu_read_unlock();
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		/* 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.
	 */
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	rcu_read_lock();
	list_for_each_entry_rcu(laddr, &bp->address_list, list) {
		if (!laddr->valid)
			continue;
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		if ((laddr->state == SCTP_ADDR_SRC) &&
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		    (AF_INET == laddr->a.sa.sa_family)) {
			fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
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			if (!ip_route_output_key(&init_net, &rt, &fl)) {
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				dst = &rt->u.dst;
				goto out_unlock;
			}
		}
	}

out_unlock:
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	rcu_read_unlock();
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out:
	if (dst)
		SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
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				  NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
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	else
		SCTP_DEBUG_PRINTK("NO ROUTE\n");

	return dst;
}

/* 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.
 */
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static void sctp_v4_get_saddr(struct sctp_sock *sk,
			      struct sctp_association *asoc,
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			      struct dst_entry *dst,
			      union sctp_addr *daddr,
			      union sctp_addr *saddr)
{
	struct rtable *rt = (struct rtable *)dst;

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	if (!asoc)
		return;

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	if (rt) {
		saddr->v4.sin_family = AF_INET;
549
		saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
550
		saddr->v4.sin_addr.s_addr = rt->rt_src;
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	}
}

/* What interface did this skb arrive on? */
static int sctp_v4_skb_iif(const struct sk_buff *skb)
{
557
	return skb->rtable->rt_iif;
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}

/* Was this packet marked by Explicit Congestion Notification? */
static int sctp_v4_is_ce(const struct sk_buff *skb)
{
563
	return INET_ECN_is_ce(ip_hdr(skb)->tos);
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}

/* 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 inet_sock *inet = inet_sk(sk);
	struct inet_sock *newinet;
572
	struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
573
			sk->sk_prot);
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	if (!newsk)
		goto out;

	sock_init_data(NULL, newsk);

	newsk->sk_type = SOCK_STREAM;

	newsk->sk_no_check = sk->sk_no_check;
	newsk->sk_reuse = sk->sk_reuse;
	newsk->sk_shutdown = sk->sk_shutdown;

	newsk->sk_destruct = inet_sock_destruct;
	newsk->sk_family = PF_INET;
	newsk->sk_protocol = IPPROTO_SCTP;
	newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
	sock_reset_flag(newsk, SOCK_ZAPPED);

	newinet = inet_sk(newsk);

	/* Initialize sk's sport, dport, rcv_saddr and daddr for
	 * getsockname() and getpeername()
	 */
	newinet->sport = inet->sport;
	newinet->saddr = inet->saddr;
	newinet->rcv_saddr = inet->rcv_saddr;
	newinet->dport = htons(asoc->peer.port);
	newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
	newinet->pmtudisc = inet->pmtudisc;
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	newinet->id = asoc->next_tsn ^ jiffies;
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	newinet->uc_ttl = -1;
	newinet->mc_loop = 1;
	newinet->mc_ttl = 1;
	newinet->mc_index = 0;
	newinet->mc_list = NULL;

611
	sk_refcnt_debug_inc(newsk);
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	if (newsk->sk_prot->init(newsk)) {
		sk_common_release(newsk);
		newsk = NULL;
	}

out:
	return newsk;
}

/* Map address, empty for v4 family */
static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
{
	/* Empty */
}

/* 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, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
}

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static void sctp_v4_ecn_capable(struct sock *sk)
{
	INET_ECN_xmit(sk);
}

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/* 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.
 */
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static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
			       void *ptr)
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{
648
	struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
649 650
	struct sctp_sockaddr_entry *addr = NULL;
	struct sctp_sockaddr_entry *temp;
651
	int found = 0;
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653
	if (dev_net(ifa->ifa_dev->dev) != &init_net)
654 655
		return NOTIFY_DONE;

656 657 658 659 660 661 662
	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;
663 664 665 666
			addr->valid = 1;
			spin_lock_bh(&sctp_local_addr_lock);
			list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
			spin_unlock_bh(&sctp_local_addr_lock);
667 668 669
		}
		break;
	case NETDEV_DOWN:
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		spin_lock_bh(&sctp_local_addr_lock);
		list_for_each_entry_safe(addr, temp,
					&sctp_local_addr_list, list) {
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			if (addr->a.sa.sa_family == AF_INET &&
					addr->a.v4.sin_addr.s_addr ==
					ifa->ifa_local) {
676
				found = 1;
677 678
				addr->valid = 0;
				list_del_rcu(&addr->list);
679 680 681
				break;
			}
		}
682
		spin_unlock_bh(&sctp_local_addr_lock);
683
		if (found)
684
			call_rcu(&addr->rcu, sctp_local_addr_free);
685 686
		break;
	}
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	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(void)
{
	int err;
	sa_family_t family;

	if (sctp_get_pf_specific(PF_INET6))
		family = PF_INET6;
	else
		family = PF_INET;

705
	err = inet_ctl_sock_create(&sctp_ctl_sock, family,
706
				   SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
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	if (err < 0) {
		printk(KERN_ERR
		       "SCTP: 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) {
786 787 788
		struct sctphdr *sh = sctp_hdr(skb);
		struct sockaddr_in *sin = (struct sockaddr_in *)msgname;

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		sctp_inet_msgname(msgname, len);
		sin->sin_port = sh->source;
791
		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
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	}
}

/* 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;
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	if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
	    htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
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		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,
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				     __be16 *types)
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{
	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, int ipfragok)
{
	SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
			  "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
851
			  __func__, skb, skb->len,
852 853
			  NIPQUAD(skb->rtable->rt_src),
			  NIPQUAD(skb->rtable->rt_dst));
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	SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
856
	return ip_queue_xmit(skb, ipfragok);
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}

859
static struct sctp_af sctp_af_inet;
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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_v4map	= sctp_v4_addr_v4map,
871
	.af            = &sctp_af_inet
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};

/* Notifier for inetaddr addition/deletion events.  */
static struct notifier_block sctp_inetaddr_notifier = {
	.notifier_call = sctp_inetaddr_event,
};

/* Socket operations.  */
880
static const struct proto_ops inet_seqpacket_ops = {
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
	.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,
899
#ifdef CONFIG_COMPAT
900 901
	.compat_setsockopt = compat_sock_common_setsockopt,
	.compat_getsockopt = compat_sock_common_getsockopt,
902
#endif
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};

/* 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,
	.capability = -1,
	.no_check   = 0,
	.flags      = SCTP_PROTOSW_FLAG
};
static struct inet_protosw sctp_stream_protosw = {
	.type       = SOCK_STREAM,
	.protocol   = IPPROTO_SCTP,
	.prot       = &sctp_prot,
	.ops        = &inet_seqpacket_ops,
	.capability = -1,
	.no_check   = 0,
	.flags      = SCTP_PROTOSW_FLAG
};

/* Register with IP layer.  */
static struct net_protocol sctp_protocol = {
	.handler     = sctp_rcv,
	.err_handler = sctp_v4_err,
	.no_policy   = 1,
};

/* IPv4 address related functions.  */
933
static struct sctp_af sctp_af_inet = {
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
	.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,
	.to_sk_saddr	   = sctp_v4_to_sk_saddr,
	.to_sk_daddr	   = sctp_v4_to_sk_daddr,
	.from_addr_param   = sctp_v4_from_addr_param,
	.to_addr_param	   = sctp_v4_to_addr_param,
	.dst_saddr	   = sctp_v4_dst_saddr,
	.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,
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	.ecn_capable	   = sctp_v4_ecn_capable,
958 959
	.net_header_len	   = sizeof(struct iphdr),
	.sockaddr_len	   = sizeof(struct sockaddr_in),
960
#ifdef CONFIG_COMPAT
961 962
	.compat_setsockopt = compat_ip_setsockopt,
	.compat_getsockopt = compat_ip_getsockopt,
963
#endif
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};

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;
}

998 999 1000
static inline int init_sctp_mibs(void)
{
	return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib));
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}

1003
static inline void cleanup_sctp_mibs(void)
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1004
{
1005
	snmp_mib_free((void**)sctp_statistics);
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}

1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
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);
}

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/* Initialize the universe into something sensible.  */
SCTP_STATIC __init int sctp_init(void)
{
	int i;
	int status = -EINVAL;
	unsigned long goal;
1066 1067
	unsigned long limit;
	int max_share;
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	int order;

	/* SCTP_DEBUG sanity check. */
	if (!sctp_sanity_check())
		goto out;

1074
	/* Allocate bind_bucket and chunk caches. */
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	status = -ENOBUFS;
	sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
					       sizeof(struct sctp_bind_bucket),
					       0, SLAB_HWCACHE_ALIGN,
1079
					       NULL);
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	if (!sctp_bucket_cachep)
1081
		goto out;
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	sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
					       sizeof(struct sctp_chunk),
					       0, SLAB_HWCACHE_ALIGN,
1086
					       NULL);
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	if (!sctp_chunk_cachep)
		goto err_chunk_cachep;

	/* Allocate and initialise sctp mibs.  */
	status = init_sctp_mibs();
	if (status)
		goto err_init_mibs;

	/* Initialize proc fs directory.  */
	status = sctp_proc_init();
	if (status)
		goto err_init_proc;

	/* Initialize object count debugging.  */
	sctp_dbg_objcnt_init();

	/*
	 * 14. Suggested SCTP Protocol Parameter Values
	 */
	/* The following protocol parameters are RECOMMENDED:  */
	/* RTO.Initial              - 3  seconds */
	sctp_rto_initial		= SCTP_RTO_INITIAL;
	/* RTO.Min                  - 1  second */
	sctp_rto_min	 		= SCTP_RTO_MIN;
	/* RTO.Max                 -  60 seconds */
	sctp_rto_max 			= SCTP_RTO_MAX;
	/* RTO.Alpha                - 1/8 */
	sctp_rto_alpha	        	= SCTP_RTO_ALPHA;
	/* RTO.Beta                 - 1/4 */
	sctp_rto_beta			= SCTP_RTO_BETA;

	/* Valid.Cookie.Life        - 60  seconds */
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	sctp_valid_cookie_life		= SCTP_DEFAULT_COOKIE_LIFE;
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	/* Whether Cookie Preservative is enabled(1) or not(0) */
	sctp_cookie_preserve_enable 	= 1;

	/* Max.Burst		    - 4 */
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	sctp_max_burst 			= SCTP_DEFAULT_MAX_BURST;
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	/* Association.Max.Retrans  - 10 attempts
	 * Path.Max.Retrans         - 5  attempts (per destination address)
	 * Max.Init.Retransmits     - 8  attempts
	 */
	sctp_max_retrans_association 	= 10;
	sctp_max_retrans_path		= 5;
	sctp_max_retrans_init		= 8;

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	/* Sendbuffer growth	    - do per-socket accounting */
	sctp_sndbuf_policy		= 0;

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	/* Rcvbuffer growth	    - do per-socket accounting */
	sctp_rcvbuf_policy		= 0;

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	/* HB.interval              - 30 seconds */
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	sctp_hb_interval		= SCTP_DEFAULT_TIMEOUT_HEARTBEAT;

	/* delayed SACK timeout */
	sctp_sack_timeout		= SCTP_DEFAULT_TIMEOUT_SACK;
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	/* 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);

1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
	/* Set the pressure threshold to be a fraction of global memory that
	 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
	 * memory, with a floor of 128 pages.
	 * Note this initalizes the data in sctpv6_prot too
	 * Unabashedly stolen from tcp_init
	 */
	limit = min(num_physpages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
	limit = (limit * (num_physpages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
	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] = PAGE_SIZE; /* give each asoc 1 page min */
	sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
	sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);

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	sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
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	sysctl_sctp_wmem[1] = 16*1024;
	sysctl_sctp_wmem[2] = max(64*1024, max_share);

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	/* Size and allocate the association hash table.
	 * The methodology is similar to that of the tcp hash tables.
	 */
	if (num_physpages >= (128 * 1024))
		goal = num_physpages >> (22 - PAGE_SHIFT);
	else
		goal = num_physpages >> (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, order);
	} while (!sctp_assoc_hashtable && --order > 0);
	if (!sctp_assoc_hashtable) {
		printk(KERN_ERR "SCTP: 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);
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		INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
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	}

	/* Allocate and initialize the endpoint hash table.  */
	sctp_ep_hashsize = 64;
	sctp_ep_hashtable = (struct sctp_hashbucket *)
		kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
	if (!sctp_ep_hashtable) {
		printk(KERN_ERR "SCTP: 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);
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		INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
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	}

	/* 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, order);
	} while (!sctp_port_hashtable && --order > 0);
	if (!sctp_port_hashtable) {
		printk(KERN_ERR "SCTP: Failed bind hash alloc.");
		status = -ENOMEM;
		goto err_bhash_alloc;
	}
	for (i = 0; i < sctp_port_hashsize; i++) {
		spin_lock_init(&sctp_port_hashtable[i].lock);
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		INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
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	}

	printk(KERN_INFO "SCTP: Hash tables configured "
			 "(established %d bind %d)\n",
		sctp_assoc_hashsize, sctp_port_hashsize);

	/* Disable ADDIP by default. */
	sctp_addip_enable = 0;
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	sctp_addip_noauth = 0;
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	/* Enable PR-SCTP by default. */
	sctp_prsctp_enable = 1;

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	/* Disable AUTH by default. */
	sctp_auth_enable = 0;

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	sctp_sysctl_register();

	INIT_LIST_HEAD(&sctp_address_families);
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	sctp_v4_pf_init();
	sctp_v6_pf_init();
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	/* Initialize the local address list. */
	INIT_LIST_HEAD(&sctp_local_addr_list);
	spin_lock_init(&sctp_local_addr_lock);
	sctp_get_local_addr_list();
1267

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	status = sctp_v4_protosw_init();
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	if (status)
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		goto err_protosw_init;

	status = sctp_v6_protosw_init();
	if (status)
		goto err_v6_protosw_init;
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	/* Initialize the control inode/socket for handling OOTB packets.  */
	if ((status = sctp_ctl_sock_init())) {
		printk (KERN_ERR
			"SCTP: Failed to initialize the SCTP control sock.\n");
		goto err_ctl_sock_init;
	}

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	status = sctp_v4_add_protocol();
	if (status)
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		goto err_add_protocol;

	/* Register SCTP with inet6 layer.  */
	status = sctp_v6_add_protocol();
	if (status)
		goto err_v6_add_protocol;

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	status = 0;
out:
	return status;
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err_v6_add_protocol:
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	sctp_v6_del_protocol();
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err_add_protocol:
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	sctp_v4_del_protocol();
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	inet_ctl_sock_destroy(sctp_ctl_sock);
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err_ctl_sock_init:
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	sctp_v6_protosw_exit();
err_v6_protosw_init:
	sctp_v4_protosw_exit();
err_protosw_init:
	sctp_free_local_addr_list();
	sctp_v4_pf_exit();
	sctp_v6_pf_exit();
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	sctp_sysctl_unregister();
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	list_del(&sctp_af_inet.list);
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	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:
	sctp_dbg_objcnt_exit();
	sctp_proc_exit();
1323
err_init_proc:
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	cleanup_sctp_mibs();
err_init_mibs:
	kmem_cache_destroy(sctp_chunk_cachep);
err_chunk_cachep:
	kmem_cache_destroy(sctp_bucket_cachep);
	goto out;
}

/* Exit handler for the SCTP protocol.  */
SCTP_STATIC __exit void sctp_exit(void)
{
	/* BUG.  This should probably do something useful like clean
	 * up all the remaining associations and all that memory.
	 */

1339 1340
	/* Unregister with inet6/inet layers. */
	sctp_v6_del_protocol();
1341
	sctp_v4_del_protocol();
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	/* Free the control endpoint.  */
1344
	inet_ctl_sock_destroy(sctp_ctl_sock);
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	/* Free protosw registrations */
	sctp_v6_protosw_exit();
	sctp_v4_protosw_exit();

	/* Free the local address list.  */
	sctp_free_local_addr_list();
1352 1353

	/* Unregister with socket layer. */
1354 1355
	sctp_v6_pf_exit();
	sctp_v4_pf_exit();
1356

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	sctp_sysctl_unregister();
1358
	list_del(&sctp_af_inet.list);
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	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)));

	sctp_dbg_objcnt_exit();
	sctp_proc_exit();
	cleanup_sctp_mibs();

1372 1373
	kmem_cache_destroy(sctp_chunk_cachep);
	kmem_cache_destroy(sctp_bucket_cachep);
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}

module_init(sctp_init);
module_exit(sctp_exit);

1379 1380 1381 1382
/*
 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
 */
MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1383
MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
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MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
MODULE_LICENSE("GPL");