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/*
* 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.
*
* Generic INET transport hashtables
*
* 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.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <net/inet_hashtables.h>
/*
* Allocate and initialize a new local port bind bucket.
* The bindhash mutex for snum's hash chain must be held here.
*/
struct inet_bind_bucket *inet_bind_bucket_create(kmem_cache_t *cachep,
struct inet_bind_hashbucket *head,
const unsigned short snum)
{
struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, SLAB_ATOMIC);
if (tb != NULL) {
tb->port = snum;
tb->fastreuse = 0;
INIT_HLIST_HEAD(&tb->owners);
hlist_add_head(&tb->node, &head->chain);
}
return tb;
}
EXPORT_SYMBOL(inet_bind_bucket_create);
/*
* Caller must hold hashbucket lock for this tb with local BH disabled
*/
void inet_bind_bucket_destroy(kmem_cache_t *cachep, struct inet_bind_bucket *tb)
{
if (hlist_empty(&tb->owners)) {
__hlist_del(&tb->node);
kmem_cache_free(cachep, tb);
}
}
void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
const unsigned short snum)
{
struct inet_sock *inet = inet_sk(sk);
inet->num = snum;
sk_add_bind_node(sk, &tb->owners);
inet->bind_hash = tb;
}
EXPORT_SYMBOL(inet_bind_hash);
/*
* Get rid of any references to a local port held by the given sock.
*/
static void __inet_put_port(struct inet_hashinfo *hashinfo, struct sock *sk)
{
struct inet_sock *inet = inet_sk(sk);
const int bhash = inet_bhashfn(inet->num, hashinfo->bhash_size);
struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
struct inet_bind_bucket *tb;
spin_lock(&head->lock);
tb = inet->bind_hash;
__sk_del_bind_node(sk);
inet->bind_hash = NULL;
inet->num = 0;
inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
spin_unlock(&head->lock);
}
void inet_put_port(struct inet_hashinfo *hashinfo, struct sock *sk)
{
local_bh_disable();
__inet_put_port(hashinfo, sk);
local_bh_enable();
}
EXPORT_SYMBOL(inet_put_port);
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