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.
6 * Generic INET transport hashtables
8 * Authors: Lotsa people, from code originally in tcp
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/slab.h>
20 #include <net/inet_hashtables.h>
23 * Allocate and initialize a new local port bind bucket.
24 * The bindhash mutex for snum's hash chain must be held here.
26 struct inet_bind_bucket *inet_bind_bucket_create(kmem_cache_t *cachep,
27 struct inet_bind_hashbucket *head,
28 const unsigned short snum)
30 struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, SLAB_ATOMIC);
35 INIT_HLIST_HEAD(&tb->owners);
36 hlist_add_head(&tb->node, &head->chain);
41 EXPORT_SYMBOL(inet_bind_bucket_create);
44 * Caller must hold hashbucket lock for this tb with local BH disabled
46 void inet_bind_bucket_destroy(kmem_cache_t *cachep, struct inet_bind_bucket *tb)
48 if (hlist_empty(&tb->owners)) {
49 __hlist_del(&tb->node);
50 kmem_cache_free(cachep, tb);
54 void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
55 const unsigned short snum)
57 struct inet_sock *inet = inet_sk(sk);
59 sk_add_bind_node(sk, &tb->owners);
63 EXPORT_SYMBOL(inet_bind_hash);
66 * Get rid of any references to a local port held by the given sock.
68 static void __inet_put_port(struct inet_hashinfo *hashinfo, struct sock *sk)
70 struct inet_sock *inet = inet_sk(sk);
71 const int bhash = inet_bhashfn(inet->num, hashinfo->bhash_size);
72 struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
73 struct inet_bind_bucket *tb;
75 spin_lock(&head->lock);
77 __sk_del_bind_node(sk);
78 inet->bind_hash = NULL;
80 inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
81 spin_unlock(&head->lock);
84 void inet_put_port(struct inet_hashinfo *hashinfo, struct sock *sk)
87 __inet_put_port(hashinfo, sk);
91 EXPORT_SYMBOL(inet_put_port);