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[NETNS]: Make bind buckets live in net namespaces. 

This tags the inet_bind_bucket struct with net pointer,
initializes it during creation and makes a filtering
during lookup.

A better hashfn, that takes the net into account is to
be done in the future, but currently all bind buckets
with similar port will be in one hash chain.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2008-01-31 05:05:50 -08:00 committed by David S. Miller
parent 5ee31fc1ec
commit 941b1d22cc
3 changed files with 13 additions and 5 deletions
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2
include/net/inet_hashtables.h
View File

@ -74,6 +74,7 @@ struct inet_ehash_bucket {
* ports are created in O(1) time? I thought so. ;-) -DaveM
*/
struct inet_bind_bucket {
struct net *ib_net;
unsigned short port;
signed short fastreuse;
struct hlist_node node;
@ -194,6 +195,7 @@ static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
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,

8
net/ipv4/inet_connection_sock.c
View File

@ -87,6 +87,7 @@ int inet_csk_get_port(struct inet_hashinfo *hashinfo,
struct hlist_node *node;
struct inet_bind_bucket *tb;
int ret;
struct net *net = sk->sk_net;
local_bh_disable();
if (!snum) {
@ -100,7 +101,7 @@ int inet_csk_get_port(struct inet_hashinfo *hashinfo,
head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)];
spin_lock(&head->lock);
inet_bind_bucket_for_each(tb, node, &head->chain)
if (tb->port == rover)
if (tb->ib_net == net && tb->port == rover)
goto next;
break;
next:
@ -127,7 +128,7 @@ int inet_csk_get_port(struct inet_hashinfo *hashinfo,
head = &hashinfo->bhash[inet_bhashfn(snum, hashinfo->bhash_size)];
spin_lock(&head->lock);
inet_bind_bucket_for_each(tb, node, &head->chain)
if (tb->port == snum)
if (tb->ib_net == net && tb->port == snum)
goto tb_found;
}
tb = NULL;
@ -147,7 +148,8 @@ tb_found:
}
tb_not_found:
ret = 1;
if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, head, snum)) == NULL)
if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep,
net, head, snum)) == NULL)
goto fail_unlock;
if (hlist_empty(&tb->owners)) {
if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)

8
net/ipv4/inet_hashtables.c
View File

@ -28,12 +28,14 @@
* The bindhash mutex for snum's hash chain must be held here.
*/
struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
struct net *net,
struct inet_bind_hashbucket *head,
const unsigned short snum)
{
struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
if (tb != NULL) {
tb->ib_net = net;
tb->port = snum;
tb->fastreuse = 0;
INIT_HLIST_HEAD(&tb->owners);
@ -359,6 +361,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
struct inet_bind_hashbucket *head;
struct inet_bind_bucket *tb;
int ret;
struct net *net = sk->sk_net;
if (!snum) {
int i, remaining, low, high, port;
@ -381,7 +384,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
* unique enough.
*/
inet_bind_bucket_for_each(tb, node, &head->chain) {
if (tb->port == port) {
if (tb->ib_net == net && tb->port == port) {
BUG_TRAP(!hlist_empty(&tb->owners));
if (tb->fastreuse >= 0)
goto next_port;
@ -392,7 +395,8 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
}
}
tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep, head, port);
tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
net, head, port);
if (!tb) {
spin_unlock(&head->lock);
break;