[mirror_ubuntu-bionic-kernel.git] / include / net / inet_hashtables.h

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

/* This is for all connections with a full identity, no wildcards.
 * One chain is dedicated to TIME_WAIT sockets.
 * I'll experiment with dynamic table growth later.
 */
struct inet_ehash_bucket {
	struct hlist_nulls_head chain;
	struct hlist_nulls_head twchain;
};

/* There are a few simple rules, which allow for local port reuse by
 * an application.  In essence:
 *
 *	1) Sockets bound to different interfaces may share a local port.
 *	   Failing that, goto test 2.
 *	2) If all sockets have sk->sk_reuse set, and none of them are in
 *	   TCP_LISTEN state, the port may be shared.
 *	   Failing that, goto test 3.
 *	3) If all sockets are bound to a specific inet_sk(sk)->rcv_saddr local
 *	   address, and none of them are the same, the port may be
 *	   shared.
 *	   Failing this, the port cannot be shared.
 *
 * The interesting point, is test #2.  This is what an FTP server does
 * all day.  To optimize this case we use a specific flag bit defined
 * below.  As we add sockets to a bind bucket list, we perform a
 * check of: (newsk->sk_reuse && (newsk->sk_state != TCP_LISTEN))
 * As long as all sockets added to a bind bucket pass this test,
 * the flag bit will be set.
 * The resulting situation is that tcp_v[46]_verify_bind() can just check
 * for this flag bit, if it is set and the socket trying to bind has
 * sk->sk_reuse set, we don't even have to walk the owners list at all,
 * we return that it is ok to bind this socket to the requested local port.
 *
 * Sounds like a lot of work, but it is worth it.  In a more naive
 * implementation (ie. current FreeBSD etc.) the entire list of ports
 * must be walked for each data port opened by an ftp server.  Needless
 * to say, this does not scale at all.  With a couple thousand FTP
 * users logged onto your box, isn't it nice to know that new data
 * ports are created in O(1) time?  I thought so. ;-)	-DaveM
 */
struct inet_bind_bucket {
#ifdef CONFIG_NET_NS
	struct net		*ib_net;
#endif
	unsigned short		port;
	signed short		fastreuse;
	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, node, head) \
	hlist_for_each_entry(tb, node, head, node)

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

struct inet_listen_hashbucket {
	spinlock_t		lock;
	struct hlist_head	head;
};

/* This is for listening sockets, thus all sockets which possess wildcards. */
#define INET_LHTABLE_SIZE	32	/* Yes, really, this is all you need. */

struct inet_hashinfo {
	/* This is for sockets with full identity only.  Sockets here will
	 * always be without wildcards and will have the following invariant:
	 *
	 *          TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
	 *
	 * TIME_WAIT sockets use a separate chain (twchain).
	 */
	struct inet_ehash_bucket	*ehash;
	spinlock_t			*ehash_locks;
	unsigned int			ehash_size;
	unsigned int			ehash_locks_mask;

	/* Ok, let's try this, I give up, we do need a local binding
	 * TCP hash as well as the others for fast bind/connect.
	 */
	struct inet_bind_hashbucket	*bhash;

	unsigned int			bhash_size;
	/* Note : 4 bytes padding on 64 bit arches */

	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.
	 */
	/* All sockets in TCP_LISTEN state will be in here.  This is the only
	 * table where wildcard'd TCP sockets can exist.  Hash function here
	 * is just local port number.
	 */
	struct inet_listen_hashbucket	listening_hash[INET_LHTABLE_SIZE]
					____cacheline_aligned_in_smp;

};

static inline struct inet_ehash_bucket *inet_ehash_bucket(
	struct inet_hashinfo *hashinfo,
	unsigned int hash)
{
	return &hashinfo->ehash[hash & (hashinfo->ehash_size - 1)];
}

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(rwlock_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);

/* These can have wildcards, don't try too hard. */
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)->num);
}

/* Caller must disable local BH processing. */
extern void __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 void __inet_hash_nolisten(struct sock *sk);
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);
}

/* Socket demux engine toys. */
/* What happens here is ugly; there's a pair of adjacent fields in
   struct inet_sock; __be16 dport followed by __u16 num.  We want to
   search by pair, so we combine the keys into a single 32bit value
   and compare with 32bit value read from &...->dport.  Let's at least
   make sure that it's not mixed with anything else...
   On 64bit targets we combine comparisons with pair of adjacent __be32
   fields in the same way.
*/
typedef __u32 __bitwise __portpair;
#ifdef __BIG_ENDIAN
#define INET_COMBINED_PORTS(__sport, __dport) \
	((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
#else /* __LITTLE_ENDIAN */
#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 /* __LITTLE_ENDIAN */
#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
	const __addrpair __name = (__force __addrpair) ( \
				   (((__force __u64)(__be32)(__daddr)) << 32) | \
				   ((__force __u64)(__be32)(__saddr)));
#endif /* __BIG_ENDIAN */
#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)->daddr))) == (__cookie))	&&	\
	 ((*((__portpair *)&(inet_sk(__sk)->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 /* 32-bit arch */
#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)->daddr		== (__saddr))		&&	\
	 (inet_sk(__sk)->rcv_saddr	== (__daddr))		&&	\
	 ((*((__portpair *)&(inet_sk(__sk)->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 /* 64-bit arch */

/*
 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
 * not check it for lookups anymore, thanks Alexey. -DaveM
 *
 * Local BH must be disabled here.
 */
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->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 **),
			       void (*hash)(struct sock *sk));
extern int inet_hash_connect(struct inet_timewait_death_row *death_row,
			     struct sock *sk);
#endif /* _INET_HASHTABLES_H */
Commit	Line	Data
304a1618 ACM	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Authors: Lotsa people, from code originally in tcp
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*/
	13
	14	#ifndef _INET_HASHTABLES_H
	15	#define _INET_HASHTABLES_H
	16
8feaf0c0	17
2d8c4ce5	18	#include <linux/interrupt.h>
9a1f27c4	19	#include <linux/ip.h>
33b62231	20	#include <linux/ipv6.h>
77d8bf9c ACM	21	#include <linux/list.h>
77d8bf9c ACM	22	#include <linux/slab.h>
33b62231	23	#include <linux/socket.h>
77d8bf9c	24	#include <linux/spinlock.h>
304a1618	25	#include <linux/types.h>
f3f05f70	26	#include <linux/wait.h>
9e4505c4	27	#include <linux/vmalloc.h>
304a1618	28
463c84b9	29	#include <net/inet_connection_sock.h>
14c85021	30	#include <net/inet_sock.h>
2d8c4ce5	31	#include <net/sock.h>
9a1f27c4	32	#include <net/route.h>
c752f073	33	#include <net/tcp_states.h>
0b441916	34	#include <net/netns/hash.h>
2d8c4ce5	35
f3f05f70	36	#include <asm/atomic.h>
e48c414e	37	#include <asm/byteorder.h>
f3f05f70	38
77d8bf9c	39	/* This is for all connections with a full identity, no wildcards.
dbca9b27 ED	40	* One chain is dedicated to TIME_WAIT sockets.
dbca9b27 ED	41	* I'll experiment with dynamic table growth later.
77d8bf9c ACM	42	*/
77d8bf9c ACM	43	struct inet_ehash_bucket {
3ab5aee7 ED	44	struct hlist_nulls_head chain;
3ab5aee7 ED	45	struct hlist_nulls_head twchain;
6d255361	46	};
77d8bf9c ACM	47
	48	/* There are a few simple rules, which allow for local port reuse by
	49	* an application. In essence:
	50	*
	51	* 1) Sockets bound to different interfaces may share a local port.
	52	* Failing that, goto test 2.
	53	* 2) If all sockets have sk->sk_reuse set, and none of them are in
	54	* TCP_LISTEN state, the port may be shared.
	55	* Failing that, goto test 3.
	56	* 3) If all sockets are bound to a specific inet_sk(sk)->rcv_saddr local
	57	* address, and none of them are the same, the port may be
	58	* shared.
	59	* Failing this, the port cannot be shared.
	60	*
	61	* The interesting point, is test #2. This is what an FTP server does
	62	* all day. To optimize this case we use a specific flag bit defined
	63	* below. As we add sockets to a bind bucket list, we perform a
	64	* check of: (newsk->sk_reuse && (newsk->sk_state != TCP_LISTEN))
	65	* As long as all sockets added to a bind bucket pass this test,
	66	* the flag bit will be set.
	67	* The resulting situation is that tcp_v[46]_verify_bind() can just check
	68	* for this flag bit, if it is set and the socket trying to bind has
	69	* sk->sk_reuse set, we don't even have to walk the owners list at all,
	70	* we return that it is ok to bind this socket to the requested local port.
	71	*
	72	* Sounds like a lot of work, but it is worth it. In a more naive
	73	* implementation (ie. current FreeBSD etc.) the entire list of ports
	74	* must be walked for each data port opened by an ftp server. Needless
	75	* to say, this does not scale at all. With a couple thousand FTP
	76	* users logged onto your box, isn't it nice to know that new data
	77	* ports are created in O(1) time? I thought so. ;-) -DaveM
	78	*/
	79	struct inet_bind_bucket {
7a9546ee	80	#ifdef CONFIG_NET_NS
941b1d22	81	struct net *ib_net;
7a9546ee	82	#endif
77d8bf9c ACM	83	unsigned short port;
	84	signed short fastreuse;
	85	struct hlist_node node;
	86	struct hlist_head owners;
	87	};
	88
7a9546ee ED	89	static inline struct net ib_net(struct inet_bind_bucket ib)
	90	{
	91	return read_pnet(&ib->ib_net);
	92	}
	93
77d8bf9c ACM	94	#define inet_bind_bucket_for_each(tb, node, head) \
	95	hlist_for_each_entry(tb, node, head, node)
	96
	97	struct inet_bind_hashbucket {
	98	spinlock_t lock;
	99	struct hlist_head chain;
	100	};
	101
5caea4ea ED	102	struct inet_listen_hashbucket {
	103	spinlock_t lock;
	104	struct hlist_head head;
	105	};
	106
77d8bf9c ACM	107	/* This is for listening sockets, thus all sockets which possess wildcards. */
	108	#define INET_LHTABLE_SIZE 32 /* Yes, really, this is all you need. */
	109
	110	struct inet_hashinfo {
	111	/* This is for sockets with full identity only. Sockets here will
	112	* always be without wildcards and will have the following invariant:
	113	*
	114	* TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
	115	*
dbca9b27	116	* TIME_WAIT sockets use a separate chain (twchain).
77d8bf9c ACM	117	*/
77d8bf9c ACM	118	struct inet_ehash_bucket *ehash;
9db66bdc	119	spinlock_t *ehash_locks;
230140cf ED	120	unsigned int ehash_size;
230140cf ED	121	unsigned int ehash_locks_mask;
77d8bf9c ACM	122
	123	/* Ok, let's try this, I give up, we do need a local binding
	124	* TCP hash as well as the others for fast bind/connect.
	125	*/
	126	struct inet_bind_hashbucket *bhash;
	127
cfcabdcc	128	unsigned int bhash_size;
230140cf	129	/* Note : 4 bytes padding on 64 bit arches */
77d8bf9c	130
5caea4ea	131	struct kmem_cache *bind_bucket_cachep;
77d8bf9c ACM	132
	133	/* All the above members are written once at bootup and
	134	* never written again _or_ are predominantly read-access.
	135	*
	136	* Now align to a new cache line as all the following members
5caea4ea ED	137	* might be often dirty.
	138	*/
	139	/* All sockets in TCP_LISTEN state will be in here. This is the only
	140	* table where wildcard'd TCP sockets can exist. Hash function here
	141	* is just local port number.
77d8bf9c	142	*/
5caea4ea ED	143	struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE]
	144	____cacheline_aligned_in_smp;
	145
77d8bf9c ACM	146	};
77d8bf9c ACM	147
81c3d547 ED	148	static inline struct inet_ehash_bucket *inet_ehash_bucket(
	149	struct inet_hashinfo *hashinfo,
	150	unsigned int hash)
	151	{
	152	return &hashinfo->ehash[hash & (hashinfo->ehash_size - 1)];
304a1618 ACM	153	}
304a1618 ACM	154
9db66bdc	155	static inline spinlock_t *inet_ehash_lockp(
230140cf ED	156	struct inet_hashinfo *hashinfo,
	157	unsigned int hash)
	158	{
	159	return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
	160	}
	161
	162	static inline int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
	163	{
	164	unsigned int i, size = 256;
	165	#if defined(CONFIG_PROVE_LOCKING)
	166	unsigned int nr_pcpus = 2;
	167	#else
	168	unsigned int nr_pcpus = num_possible_cpus();
	169	#endif
	170	if (nr_pcpus >= 4)
	171	size = 512;
	172	if (nr_pcpus >= 8)
	173	size = 1024;
	174	if (nr_pcpus >= 16)
	175	size = 2048;
	176	if (nr_pcpus >= 32)
	177	size = 4096;
	178	if (sizeof(rwlock_t) != 0) {
	179	#ifdef CONFIG_NUMA
9db66bdc ED	180	if (size * sizeof(spinlock_t) > PAGE_SIZE)
9db66bdc ED	181	hashinfo->ehash_locks = vmalloc(size * sizeof(spinlock_t));
230140cf ED	182	else
230140cf ED	183	#endif
9db66bdc	184	hashinfo->ehash_locks = kmalloc(size * sizeof(spinlock_t),
230140cf ED	185	GFP_KERNEL);
	186	if (!hashinfo->ehash_locks)
	187	return ENOMEM;
	188	for (i = 0; i < size; i++)
9db66bdc	189	spin_lock_init(&hashinfo->ehash_locks[i]);
230140cf ED	190	}
	191	hashinfo->ehash_locks_mask = size - 1;
	192	return 0;
	193	}
	194
	195	static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
	196	{
	197	if (hashinfo->ehash_locks) {
	198	#ifdef CONFIG_NUMA
	199	unsigned int size = (hashinfo->ehash_locks_mask + 1) *
9db66bdc	200	sizeof(spinlock_t);
230140cf ED	201	if (size > PAGE_SIZE)
	202	vfree(hashinfo->ehash_locks);
	203	else
230140cf	204	#endif
218ad12f	205	kfree(hashinfo->ehash_locks);
230140cf ED	206	hashinfo->ehash_locks = NULL;
	207	}
	208	}
	209
77d8bf9c	210	extern struct inet_bind_bucket *
e18b890b	211	inet_bind_bucket_create(struct kmem_cache *cachep,
941b1d22	212	struct net *net,
77d8bf9c ACM	213	struct inet_bind_hashbucket *head,
77d8bf9c ACM	214	const unsigned short snum);
e18b890b	215	extern void inet_bind_bucket_destroy(struct kmem_cache *cachep,
77d8bf9c ACM	216	struct inet_bind_bucket *tb);
77d8bf9c ACM	217
7f635ab7 PE	218	static inline int inet_bhashfn(struct net *net,
7f635ab7 PE	219	const __u16 lport, const int bhash_size)
77d8bf9c	220	{
0b441916	221	return (lport + net_hash_mix(net)) & (bhash_size - 1);
77d8bf9c ACM	222	}
77d8bf9c ACM	223
2d8c4ce5 ACM	224	extern void inet_bind_hash(struct sock sk, struct inet_bind_bucket tb,
	225	const unsigned short snum);
	226
77d8bf9c	227	/* These can have wildcards, don't try too hard. */
2086a650	228	static inline int inet_lhashfn(struct net *net, const unsigned short num)
77d8bf9c	229	{
0b441916	230	return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
77d8bf9c ACM	231	}
	232
	233	static inline int inet_sk_listen_hashfn(const struct sock *sk)
	234	{
2086a650	235	return inet_lhashfn(sock_net(sk), inet_sk(sk)->num);
77d8bf9c ACM	236	}
77d8bf9c ACM	237
2d8c4ce5	238	/* Caller must disable local BH processing. */
53083773	239	extern void __inet_inherit_port(struct sock sk, struct sock child);
2d8c4ce5	240
ab1e0a13	241	extern void inet_put_port(struct sock *sk);
2d8c4ce5	242
5caea4ea	243	void inet_hashinfo_init(struct inet_hashinfo *h);
f3f05f70	244
ab1e0a13 ACM	245	extern void __inet_hash_nolisten(struct sock *sk);
	246	extern void inet_hash(struct sock *sk);
	247	extern void inet_unhash(struct sock *sk);
33b62231	248
c67499c0 PE	249	extern struct sock __inet_lookup_listener(struct net net,
c67499c0 PE	250	struct inet_hashinfo *hashinfo,
fb99c848	251	const __be32 daddr,
8f491069 HX	252	const unsigned short hnum,
	253	const int dif);
	254
c67499c0 PE	255	static inline struct sock inet_lookup_listener(struct net net,
	256	struct inet_hashinfo *hashinfo,
	257	__be32 daddr, __be16 dport, int dif)
8f491069	258	{
c67499c0	259	return __inet_lookup_listener(net, hashinfo, daddr, ntohs(dport), dif);
8f491069	260	}
8feaf0c0 ACM	261
8feaf0c0 ACM	262	/* Socket demux engine toys. */
4f765d84 AV	263	/* What happens here is ugly; there's a pair of adjacent fields in
	264	struct inet_sock; __be16 dport followed by __u16 num. We want to
	265	search by pair, so we combine the keys into a single 32bit value
	266	and compare with 32bit value read from &...->dport. Let's at least
	267	make sure that it's not mixed with anything else...
	268	On 64bit targets we combine comparisons with pair of adjacent __be32
	269	fields in the same way.
	270	*/
	271	typedef __u32 __bitwise __portpair;
8feaf0c0 ACM	272	#ifdef __BIG_ENDIAN
8feaf0c0 ACM	273	#define INET_COMBINED_PORTS(__sport, __dport) \
4f765d84	274	((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) \| (__u32)(__dport)))
8feaf0c0 ACM	275	#else /* __LITTLE_ENDIAN */
8feaf0c0 ACM	276	#define INET_COMBINED_PORTS(__sport, __dport) \
4f765d84	277	((__force __portpair)(((__u32)(__dport) << 16) \| (__force __u32)(__be16)(__sport)))
8feaf0c0 ACM	278	#endif
	279
	280	#if (BITS_PER_LONG == 64)
4f765d84	281	typedef __u64 __bitwise __addrpair;
8feaf0c0 ACM	282	#ifdef __BIG_ENDIAN
8feaf0c0 ACM	283	#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
4f765d84 AV	284	const __addrpair __name = (__force __addrpair) ( \
	285	(((__force __u64)(__be32)(__saddr)) << 32) \| \
	286	((__force __u64)(__be32)(__daddr)));
8feaf0c0 ACM	287	#else /* __LITTLE_ENDIAN */
8feaf0c0 ACM	288	#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
4f765d84 AV	289	const __addrpair __name = (__force __addrpair) ( \
	290	(((__force __u64)(__be32)(__daddr)) << 32) \| \
	291	((__force __u64)(__be32)(__saddr)));
8feaf0c0	292	#endif /* __BIG_ENDIAN */
c67499c0	293	#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
f757fec4	294	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
4f765d84 AV	295	((((__addrpair )&(inet_sk(__sk)->daddr))) == (__cookie)) && \
4f765d84 AV	296	((((__portpair )&(inet_sk(__sk)->dport))) == (__ports)) && \
8feaf0c0	297	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
c67499c0	298	#define INET_TW_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
f757fec4	299	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
4f765d84 AV	300	((((__addrpair )&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) && \
4f765d84 AV	301	((((__portpair )&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
8feaf0c0 ACM	302	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
	303	#else /* 32-bit arch */
	304	#define INET_ADDR_COOKIE(__name, __saddr, __daddr)
c67499c0	305	#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif) \
f757fec4	306	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
81c3d547	307	(inet_sk(__sk)->daddr == (__saddr)) && \
8feaf0c0	308	(inet_sk(__sk)->rcv_saddr == (__daddr)) && \
4f765d84	309	((((__portpair )&(inet_sk(__sk)->dport))) == (__ports)) && \
8feaf0c0	310	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
c67499c0	311	#define INET_TW_MATCH(__sk, __net, __hash,__cookie, __saddr, __daddr, __ports, __dif) \
f757fec4	312	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
81c3d547	313	(inet_twsk(__sk)->tw_daddr == (__saddr)) && \
8feaf0c0	314	(inet_twsk(__sk)->tw_rcv_saddr == (__daddr)) && \
4f765d84	315	((((__portpair )&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
8feaf0c0 ACM	316	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
8feaf0c0 ACM	317	#endif /* 64-bit arch */
e48c414e ACM	318
	319	/*
	320	* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
	321	* not check it for lookups anymore, thanks Alexey. -DaveM
	322	*
	323	* Local BH must be disabled here.
	324	*/
c67499c0 PE	325	extern struct sock * __inet_lookup_established(struct net *net,
c67499c0 PE	326	struct inet_hashinfo *hashinfo,
77a5ba55 PE	327	const __be32 saddr, const __be16 sport,
77a5ba55 PE	328	const __be32 daddr, const u16 hnum, const int dif);
e48c414e	329
8f491069	330	static inline struct sock *
c67499c0	331	inet_lookup_established(struct net net, struct inet_hashinfo hashinfo,
fb99c848 AV	332	const __be32 saddr, const __be16 sport,
fb99c848 AV	333	const __be32 daddr, const __be16 dport,
8f491069 HX	334	const int dif)
8f491069 HX	335	{
c67499c0	336	return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
8f491069 HX	337	ntohs(dport), dif);
	338	}
	339
c67499c0 PE	340	static inline struct sock __inet_lookup(struct net net,
c67499c0 PE	341	struct inet_hashinfo *hashinfo,
fb99c848 AV	342	const __be32 saddr, const __be16 sport,
fb99c848 AV	343	const __be32 daddr, const __be16 dport,
e48c414e ACM	344	const int dif)
e48c414e ACM	345	{
8f491069	346	u16 hnum = ntohs(dport);
c67499c0 PE	347	struct sock *sk = __inet_lookup_established(net, hashinfo,
	348	saddr, sport, daddr, hnum, dif);
	349
	350	return sk ? : __inet_lookup_listener(net, hashinfo, daddr, hnum, dif);
e48c414e ACM	351	}
e48c414e ACM	352
c67499c0 PE	353	static inline struct sock inet_lookup(struct net net,
c67499c0 PE	354	struct inet_hashinfo *hashinfo,
fb99c848 AV	355	const __be32 saddr, const __be16 sport,
fb99c848 AV	356	const __be32 daddr, const __be16 dport,
e48c414e ACM	357	const int dif)
	358	{
	359	struct sock *sk;
	360
	361	local_bh_disable();
c67499c0	362	sk = __inet_lookup(net, hashinfo, saddr, sport, daddr, dport, dif);
e48c414e ACM	363	local_bh_enable();
	364
	365	return sk;
	366	}
a7f5e7f1	367
9a1f27c4 ACM	368	static inline struct sock __inet_lookup_skb(struct inet_hashinfo hashinfo,
	369	struct sk_buff *skb,
	370	const __be16 sport,
	371	const __be16 dport)
	372	{
23542618	373	struct sock *sk;
9a1f27c4 ACM	374	const struct iphdr *iph = ip_hdr(skb);
9a1f27c4 ACM	375
23542618 KK	376	if (unlikely(sk = skb_steal_sock(skb)))
	377	return sk;
	378	else
	379	return __inet_lookup(dev_net(skb->dst->dev), hashinfo,
	380	iph->saddr, sport,
	381	iph->daddr, dport, inet_iif(skb));
9a1f27c4 ACM	382	}
9a1f27c4 ACM	383
5ee31fc1	384	extern int __inet_hash_connect(struct inet_timewait_death_row *death_row,
5d8c0aa9	385	struct sock *sk, u32 port_offset,
5ee31fc1 PE	386	int (check_established)(struct inet_timewait_death_row ,
5ee31fc1 PE	387	struct sock , __u16, struct inet_timewait_sock *),
ab1e0a13	388	void (hash)(struct sock sk));
a7f5e7f1 ACM	389	extern int inet_hash_connect(struct inet_timewait_death_row *death_row,
a7f5e7f1 ACM	390	struct sock *sk);
304a1618	391	#endif /* _INET_HASHTABLES_H */