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77d8bf9c 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 | * Generic INET transport hashtables | |
7 | * | |
8 | * Authors: Lotsa people, from code originally in tcp | |
9 | * | |
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. | |
14 | */ | |
15 | ||
16 | #include <linux/config.h> | |
2d8c4ce5 | 17 | #include <linux/module.h> |
77d8bf9c ACM |
18 | #include <linux/slab.h> |
19 | ||
20 | #include <net/inet_hashtables.h> | |
21 | ||
22 | /* | |
23 | * Allocate and initialize a new local port bind bucket. | |
24 | * The bindhash mutex for snum's hash chain must be held here. | |
25 | */ | |
26 | struct inet_bind_bucket *inet_bind_bucket_create(kmem_cache_t *cachep, | |
27 | struct inet_bind_hashbucket *head, | |
28 | const unsigned short snum) | |
29 | { | |
30 | struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, SLAB_ATOMIC); | |
31 | ||
32 | if (tb != NULL) { | |
33 | tb->port = snum; | |
34 | tb->fastreuse = 0; | |
35 | INIT_HLIST_HEAD(&tb->owners); | |
36 | hlist_add_head(&tb->node, &head->chain); | |
37 | } | |
38 | return tb; | |
39 | } | |
40 | ||
41 | EXPORT_SYMBOL(inet_bind_bucket_create); | |
42 | ||
43 | /* | |
44 | * Caller must hold hashbucket lock for this tb with local BH disabled | |
45 | */ | |
46 | void inet_bind_bucket_destroy(kmem_cache_t *cachep, struct inet_bind_bucket *tb) | |
47 | { | |
48 | if (hlist_empty(&tb->owners)) { | |
49 | __hlist_del(&tb->node); | |
50 | kmem_cache_free(cachep, tb); | |
51 | } | |
52 | } | |
2d8c4ce5 ACM |
53 | |
54 | void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb, | |
55 | const unsigned short snum) | |
56 | { | |
57 | struct inet_sock *inet = inet_sk(sk); | |
58 | inet->num = snum; | |
59 | sk_add_bind_node(sk, &tb->owners); | |
60 | inet->bind_hash = tb; | |
61 | } | |
62 | ||
63 | EXPORT_SYMBOL(inet_bind_hash); | |
64 | ||
65 | /* | |
66 | * Get rid of any references to a local port held by the given sock. | |
67 | */ | |
68 | static void __inet_put_port(struct inet_hashinfo *hashinfo, struct sock *sk) | |
69 | { | |
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; | |
74 | ||
75 | spin_lock(&head->lock); | |
76 | tb = inet->bind_hash; | |
77 | __sk_del_bind_node(sk); | |
78 | inet->bind_hash = NULL; | |
79 | inet->num = 0; | |
80 | inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb); | |
81 | spin_unlock(&head->lock); | |
82 | } | |
83 | ||
84 | void inet_put_port(struct inet_hashinfo *hashinfo, struct sock *sk) | |
85 | { | |
86 | local_bh_disable(); | |
87 | __inet_put_port(hashinfo, sk); | |
88 | local_bh_enable(); | |
89 | } | |
90 | ||
91 | EXPORT_SYMBOL(inet_put_port); |