include/net/inet_hashtables.h - android_kernel_htc_m7 - Gitiles

 /*
  * INET		An implementation of the TCP/IP protocol suite for the LINUX
  *		operating system.  INET is implemented using the BSD Socket
  *		interface as the means of communication with the user level.
  *
  * Authors:	Lotsa people, from code originally in tcp
  *
  *	This program 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 of the License, or (at your option) any later version.
  */

 #ifndef _INET_HASHTABLES_H
 #define _INET_HASHTABLES_H


 #include <linux/interrupt.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
 #include <linux/list.h>
 #include <linux/slab.h>
 #include <linux/socket.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include <linux/wait.h>
 #include <linux/vmalloc.h>

 #include <net/inet_connection_sock.h>
 #include <net/inet_sock.h>
 #include <net/sock.h>
 #include <net/route.h>
 #include <net/tcp_states.h>
 #include <net/netns/hash.h>

 #include <linux/atomic.h>
 #include <asm/byteorder.h>

 struct inet_ehash_bucket {
 	struct hlist_nulls_head chain;
 	struct hlist_nulls_head twchain;
 };

 struct inet_bind_bucket {
 #ifdef CONFIG_NET_NS
 	struct net		*ib_net;
 #endif
 	unsigned short		port;
 	signed short		fastreuse;
 	int			num_owners;
 	struct hlist_node	node;
 	struct hlist_head	owners;
 };

 static inline struct net *ib_net(struct inet_bind_bucket *ib)
 {
 	return read_pnet(&ib->ib_net);
 }

 #define inet_bind_bucket_for_each(tb, pos, head) \
 	hlist_for_each_entry(tb, pos, head, node)

 struct inet_bind_hashbucket {
 	spinlock_t		lock;
 	struct hlist_head	chain;
 };

 #define LISTENING_NULLS_BASE (1U << 29)
 struct inet_listen_hashbucket {
 	spinlock_t		lock;
 	struct hlist_nulls_head	head;
 };

 #define INET_LHTABLE_SIZE	32

 struct inet_hashinfo {
 	struct inet_ehash_bucket	*ehash;
 	spinlock_t			*ehash_locks;
 	unsigned int			ehash_mask;
 	unsigned int			ehash_locks_mask;

 	struct inet_bind_hashbucket	*bhash;

 	unsigned int			bhash_size;


 	struct kmem_cache		*bind_bucket_cachep;

 	/* All the above members are written once at bootup and
 	 * never written again _or_ are predominantly read-access.
 	 *
 	 * Now align to a new cache line as all the following members
 	 * might be often dirty.
 	 */
 	struct inet_listen_hashbucket	listening_hash[INET_LHTABLE_SIZE]
 					____cacheline_aligned_in_smp;

 	atomic_t			bsockets;
 };

 static inline struct inet_ehash_bucket *inet_ehash_bucket(
 	struct inet_hashinfo *hashinfo,
 	unsigned int hash)
 {
 	return &hashinfo->ehash[hash & hashinfo->ehash_mask];
 }

 static inline spinlock_t *inet_ehash_lockp(
 	struct inet_hashinfo *hashinfo,
 	unsigned int hash)
 {
 	return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
 }

 static inline int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
 {
 	unsigned int i, size = 256;
 #if defined(CONFIG_PROVE_LOCKING)
 	unsigned int nr_pcpus = 2;
 #else
 	unsigned int nr_pcpus = num_possible_cpus();
 #endif
 	if (nr_pcpus >= 4)
 		size = 512;
 	if (nr_pcpus >= 8)
 		size = 1024;
 	if (nr_pcpus >= 16)
 		size = 2048;
 	if (nr_pcpus >= 32)
 		size = 4096;
 	if (sizeof(spinlock_t) != 0) {
 #ifdef CONFIG_NUMA
 		if (size * sizeof(spinlock_t) > PAGE_SIZE)
 			hashinfo->ehash_locks = vmalloc(size * sizeof(spinlock_t));
 		else
 #endif
 		hashinfo->ehash_locks =	kmalloc(size * sizeof(spinlock_t),
 						GFP_KERNEL);
 		if (!hashinfo->ehash_locks)
 			return ENOMEM;
 		for (i = 0; i < size; i++)
 			spin_lock_init(&hashinfo->ehash_locks[i]);
 	}
 	hashinfo->ehash_locks_mask = size - 1;
 	return 0;
 }

 static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
 {
 	if (hashinfo->ehash_locks) {
 #ifdef CONFIG_NUMA
 		unsigned int size = (hashinfo->ehash_locks_mask + 1) *
 							sizeof(spinlock_t);
 		if (size > PAGE_SIZE)
 			vfree(hashinfo->ehash_locks);
 		else
 #endif
 		kfree(hashinfo->ehash_locks);
 		hashinfo->ehash_locks = NULL;
 	}
 }

 extern struct inet_bind_bucket *
 		    inet_bind_bucket_create(struct kmem_cache *cachep,
 					    struct net *net,
 					    struct inet_bind_hashbucket *head,
 					    const unsigned short snum);
 extern void inet_bind_bucket_destroy(struct kmem_cache *cachep,
 				     struct inet_bind_bucket *tb);

 static inline int inet_bhashfn(struct net *net,
 		const __u16 lport, const int bhash_size)
 {
 	return (lport + net_hash_mix(net)) & (bhash_size - 1);
 }

 extern void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
 			   const unsigned short snum);

 static inline int inet_lhashfn(struct net *net, const unsigned short num)
 {
 	return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
 }

 static inline int inet_sk_listen_hashfn(const struct sock *sk)
 {
 	return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
 }

 extern int __inet_inherit_port(struct sock *sk, struct sock *child);

 extern void inet_put_port(struct sock *sk);

 void inet_hashinfo_init(struct inet_hashinfo *h);

 extern int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw);
 extern void inet_hash(struct sock *sk);
 extern void inet_unhash(struct sock *sk);

 extern struct sock *__inet_lookup_listener(struct net *net,
 					   struct inet_hashinfo *hashinfo,
 					   const __be32 daddr,
 					   const unsigned short hnum,
 					   const int dif);

 static inline struct sock *inet_lookup_listener(struct net *net,
 		struct inet_hashinfo *hashinfo,
 		__be32 daddr, __be16 dport, int dif)
 {
 	return __inet_lookup_listener(net, hashinfo, daddr, ntohs(dport), dif);
 }

 typedef __u32 __bitwise __portpair;
 #ifdef __BIG_ENDIAN
 #define INET_COMBINED_PORTS(__sport, __dport) \
 	((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
 #else
 #define INET_COMBINED_PORTS(__sport, __dport) \
 	((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
 #endif

 #if (BITS_PER_LONG == 64)
 typedef __u64 __bitwise __addrpair;
 #ifdef __BIG_ENDIAN
 #define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
 	const __addrpair __name = (__force __addrpair) ( \
 				   (((__force __u64)(__be32)(__saddr)) << 32) | \
 				   ((__force __u64)(__be32)(__daddr)));
 #else
 #define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
 	const __addrpair __name = (__force __addrpair) ( \
 				   (((__force __u64)(__be32)(__daddr)) << 32) | \
 				   ((__force __u64)(__be32)(__saddr)));
 #endif
 #define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
 	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) &&	\
 	 ((*((__addrpair *)&(inet_sk(__sk)->inet_daddr))) == (__cookie))  &&	\
 	 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports))   &&	\
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 #define INET_TW_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
 	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) &&	\
 	 ((*((__addrpair *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) &&	\
 	 ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) &&	\
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 #else
 #define INET_ADDR_COOKIE(__name, __saddr, __daddr)
 #define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)	\
 	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net))	&&	\
 	 (inet_sk(__sk)->inet_daddr	== (__saddr))		&&	\
 	 (inet_sk(__sk)->inet_rcv_saddr	== (__daddr))		&&	\
 	 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports))	&&	\
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 #define INET_TW_MATCH(__sk, __net, __hash,__cookie, __saddr, __daddr, __ports, __dif)	\
 	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net))	&&	\
 	 (inet_twsk(__sk)->tw_daddr	== (__saddr))		&&	\
 	 (inet_twsk(__sk)->tw_rcv_saddr	== (__daddr))		&&	\
 	 ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) &&	\
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 #endif

 extern struct sock * __inet_lookup_established(struct net *net,
 		struct inet_hashinfo *hashinfo,
 		const __be32 saddr, const __be16 sport,
 		const __be32 daddr, const u16 hnum, const int dif);

 static inline struct sock *
 	inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
 				const __be32 saddr, const __be16 sport,
 				const __be32 daddr, const __be16 dport,
 				const int dif)
 {
 	return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
 					 ntohs(dport), dif);
 }

 static inline struct sock *__inet_lookup(struct net *net,
 					 struct inet_hashinfo *hashinfo,
 					 const __be32 saddr, const __be16 sport,
 					 const __be32 daddr, const __be16 dport,
 					 const int dif)
 {
 	u16 hnum = ntohs(dport);
 	struct sock *sk = __inet_lookup_established(net, hashinfo,
 				saddr, sport, daddr, hnum, dif);

 	return sk ? : __inet_lookup_listener(net, hashinfo, daddr, hnum, dif);
 }

 static inline struct sock *inet_lookup(struct net *net,
 				       struct inet_hashinfo *hashinfo,
 				       const __be32 saddr, const __be16 sport,
 				       const __be32 daddr, const __be16 dport,
 				       const int dif)
 {
 	struct sock *sk;

 	local_bh_disable();
 	sk = __inet_lookup(net, hashinfo, saddr, sport, daddr, dport, dif);
 	local_bh_enable();

 	return sk;
 }

 static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
 					     struct sk_buff *skb,
 					     const __be16 sport,
 					     const __be16 dport)
 {
 	struct sock *sk;
 	const struct iphdr *iph = ip_hdr(skb);

 	if (unlikely(sk = skb_steal_sock(skb)))
 		return sk;
 	else
 		return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
 				     iph->saddr, sport,
 				     iph->daddr, dport, inet_iif(skb));
 }

 extern int __inet_hash_connect(struct inet_timewait_death_row *death_row,
 		struct sock *sk,
 		u32 port_offset,
 		int (*check_established)(struct inet_timewait_death_row *,
 			struct sock *, __u16, struct inet_timewait_sock **),
 		int (*hash)(struct sock *sk, struct inet_timewait_sock *twp));

 extern int inet_hash_connect(struct inet_timewait_death_row *death_row,
 			     struct sock *sk);
 #endif
	/*
	* INET An implementation of the TCP/IP protocol suite for the LINUX
	* operating system. INET is implemented using the BSD Socket
	* interface as the means of communication with the user level.
	*
	* Authors: Lotsa people, from code originally in tcp
	*
	* This program 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 of the License, or (at your option) any later version.
	*/

	#ifndef _INET_HASHTABLES_H
	#define _INET_HASHTABLES_H


	#include <linux/interrupt.h>
	#include <linux/ip.h>
	#include <linux/ipv6.h>
	#include <linux/list.h>
	#include <linux/slab.h>
	#include <linux/socket.h>
	#include <linux/spinlock.h>
	#include <linux/types.h>
	#include <linux/wait.h>
	#include <linux/vmalloc.h>

	#include <net/inet_connection_sock.h>
	#include <net/inet_sock.h>
	#include <net/sock.h>
	#include <net/route.h>
	#include <net/tcp_states.h>
	#include <net/netns/hash.h>

	#include <linux/atomic.h>
	#include <asm/byteorder.h>

	struct inet_ehash_bucket {
	struct hlist_nulls_head chain;
	struct hlist_nulls_head twchain;
	};

	struct inet_bind_bucket {
	#ifdef CONFIG_NET_NS
	struct net *ib_net;
	#endif
	unsigned short port;
	signed short fastreuse;
	int num_owners;
	struct hlist_node node;
	struct hlist_head owners;
	};

	static inline struct net ib_net(struct inet_bind_bucket ib)
	{
	return read_pnet(&ib->ib_net);
	}

	#define inet_bind_bucket_for_each(tb, pos, head) \
	hlist_for_each_entry(tb, pos, head, node)

	struct inet_bind_hashbucket {
	spinlock_t lock;
	struct hlist_head chain;
	};

	#define LISTENING_NULLS_BASE (1U << 29)
	struct inet_listen_hashbucket {
	spinlock_t lock;
	struct hlist_nulls_head head;
	};

	#define INET_LHTABLE_SIZE 32

	struct inet_hashinfo {
	struct inet_ehash_bucket *ehash;
	spinlock_t *ehash_locks;
	unsigned int ehash_mask;
	unsigned int ehash_locks_mask;

	struct inet_bind_hashbucket *bhash;

	unsigned int bhash_size;


	struct kmem_cache *bind_bucket_cachep;

	/* All the above members are written once at bootup and
	* never written again _or_ are predominantly read-access.
	*
	* Now align to a new cache line as all the following members
	* might be often dirty.
	*/
	struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE]
	____cacheline_aligned_in_smp;

	atomic_t bsockets;
	};

	static inline struct inet_ehash_bucket *inet_ehash_bucket(
	struct inet_hashinfo *hashinfo,
	unsigned int hash)
	{
	return &hashinfo->ehash[hash & hashinfo->ehash_mask];
	}

	static inline spinlock_t *inet_ehash_lockp(
	struct inet_hashinfo *hashinfo,
	unsigned int hash)
	{
	return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
	}

	static inline int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
	{
	unsigned int i, size = 256;
	#if defined(CONFIG_PROVE_LOCKING)
	unsigned int nr_pcpus = 2;
	#else
	unsigned int nr_pcpus = num_possible_cpus();
	#endif
	if (nr_pcpus >= 4)
	size = 512;
	if (nr_pcpus >= 8)
	size = 1024;
	if (nr_pcpus >= 16)
	size = 2048;
	if (nr_pcpus >= 32)
	size = 4096;
	if (sizeof(spinlock_t) != 0) {
	#ifdef CONFIG_NUMA
	if (size * sizeof(spinlock_t) > PAGE_SIZE)
	hashinfo->ehash_locks = vmalloc(size * sizeof(spinlock_t));
	else
	#endif
	hashinfo->ehash_locks = kmalloc(size * sizeof(spinlock_t),
	GFP_KERNEL);
	if (!hashinfo->ehash_locks)
	return ENOMEM;
	for (i = 0; i < size; i++)
	spin_lock_init(&hashinfo->ehash_locks[i]);
	}
	hashinfo->ehash_locks_mask = size - 1;
	return 0;
	}

	static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
	{
	if (hashinfo->ehash_locks) {
	#ifdef CONFIG_NUMA
	unsigned int size = (hashinfo->ehash_locks_mask + 1) *
	sizeof(spinlock_t);
	if (size > PAGE_SIZE)
	vfree(hashinfo->ehash_locks);
	else
	#endif
	kfree(hashinfo->ehash_locks);
	hashinfo->ehash_locks = NULL;
	}
	}

	extern struct inet_bind_bucket *
	inet_bind_bucket_create(struct kmem_cache *cachep,
	struct net *net,
	struct inet_bind_hashbucket *head,
	const unsigned short snum);
	extern void inet_bind_bucket_destroy(struct kmem_cache *cachep,
	struct inet_bind_bucket *tb);

	static inline int inet_bhashfn(struct net *net,
	const __u16 lport, const int bhash_size)
	{
	return (lport + net_hash_mix(net)) & (bhash_size - 1);
	}

	extern void inet_bind_hash(struct sock sk, struct inet_bind_bucket tb,
	const unsigned short snum);

	static inline int inet_lhashfn(struct net *net, const unsigned short num)
	{
	return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
	}

	static inline int inet_sk_listen_hashfn(const struct sock *sk)
	{
	return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
	}

	extern int __inet_inherit_port(struct sock sk, struct sock child);

	extern void inet_put_port(struct sock *sk);

	void inet_hashinfo_init(struct inet_hashinfo *h);

	extern int __inet_hash_nolisten(struct sock sk, struct inet_timewait_sock tw);
	extern void inet_hash(struct sock *sk);
	extern void inet_unhash(struct sock *sk);

	extern struct sock __inet_lookup_listener(struct net net,
	struct inet_hashinfo *hashinfo,
	const __be32 daddr,
	const unsigned short hnum,
	const int dif);

	static inline struct sock inet_lookup_listener(struct net net,
	struct inet_hashinfo *hashinfo,
	__be32 daddr, __be16 dport, int dif)
	{
	return __inet_lookup_listener(net, hashinfo, daddr, ntohs(dport), dif);
	}

	typedef __u32 __bitwise __portpair;
	#ifdef __BIG_ENDIAN
	#define INET_COMBINED_PORTS(__sport, __dport) \
	((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) \| (__u32)(__dport)))
	#else
	#define INET_COMBINED_PORTS(__sport, __dport) \
	((__force __portpair)(((__u32)(__dport) << 16) \| (__force __u32)(__be16)(__sport)))
	#endif

	#if (BITS_PER_LONG == 64)
	typedef __u64 __bitwise __addrpair;
	#ifdef __BIG_ENDIAN
	#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
	const __addrpair __name = (__force __addrpair) ( \
	(((__force __u64)(__be32)(__saddr)) << 32) \| \
	((__force __u64)(__be32)(__daddr)));
	#else
	#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
	const __addrpair __name = (__force __addrpair) ( \
	(((__force __u64)(__be32)(__daddr)) << 32) \| \
	((__force __u64)(__be32)(__saddr)));
	#endif
	#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
	((((__addrpair )&(inet_sk(__sk)->inet_daddr))) == (__cookie)) && \
	((((__portpair )&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
	#define INET_TW_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
	((((__addrpair )&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) && \
	((((__portpair )&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
	#else
	#define INET_ADDR_COOKIE(__name, __saddr, __daddr)
	#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif) \
	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
	(inet_sk(__sk)->inet_daddr == (__saddr)) && \
	(inet_sk(__sk)->inet_rcv_saddr == (__daddr)) && \
	((((__portpair )&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
	#define INET_TW_MATCH(__sk, __net, __hash,__cookie, __saddr, __daddr, __ports, __dif) \
	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
	(inet_twsk(__sk)->tw_daddr == (__saddr)) && \
	(inet_twsk(__sk)->tw_rcv_saddr == (__daddr)) && \
	((((__portpair )&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
	#endif

	extern struct sock * __inet_lookup_established(struct net *net,
	struct inet_hashinfo *hashinfo,
	const __be32 saddr, const __be16 sport,
	const __be32 daddr, const u16 hnum, const int dif);

	static inline struct sock *
	inet_lookup_established(struct net net, struct inet_hashinfo hashinfo,
	const __be32 saddr, const __be16 sport,
	const __be32 daddr, const __be16 dport,
	const int dif)
	{
	return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
	ntohs(dport), dif);
	}

	static inline struct sock __inet_lookup(struct net net,
	struct inet_hashinfo *hashinfo,
	const __be32 saddr, const __be16 sport,
	const __be32 daddr, const __be16 dport,
	const int dif)
	{
	u16 hnum = ntohs(dport);
	struct sock *sk = __inet_lookup_established(net, hashinfo,
	saddr, sport, daddr, hnum, dif);

	return sk ? : __inet_lookup_listener(net, hashinfo, daddr, hnum, dif);
	}

	static inline struct sock inet_lookup(struct net net,
	struct inet_hashinfo *hashinfo,
	const __be32 saddr, const __be16 sport,
	const __be32 daddr, const __be16 dport,
	const int dif)
	{
	struct sock *sk;

	local_bh_disable();
	sk = __inet_lookup(net, hashinfo, saddr, sport, daddr, dport, dif);
	local_bh_enable();

	return sk;
	}

	static inline struct sock __inet_lookup_skb(struct inet_hashinfo hashinfo,
	struct sk_buff *skb,
	const __be16 sport,
	const __be16 dport)
	{
	struct sock *sk;
	const struct iphdr *iph = ip_hdr(skb);

	if (unlikely(sk = skb_steal_sock(skb)))
	return sk;
	else
	return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
	iph->saddr, sport,
	iph->daddr, dport, inet_iif(skb));
	}

	extern int __inet_hash_connect(struct inet_timewait_death_row *death_row,
	struct sock *sk,
	u32 port_offset,
	int (check_established)(struct inet_timewait_death_row ,
	struct sock , __u16, struct inet_timewait_sock *),
	int (hash)(struct sock sk, struct inet_timewait_sock *twp));

	extern int inet_hash_connect(struct inet_timewait_death_row *death_row,
	struct sock *sk);
	#endif