forked from luck/tmp_suning_uos_patched
d8c97a9451
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: David S. Miller <davem@davemloft.net>
115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
/*
|
|
* 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 TIME_WAIT sockets functions
|
|
*
|
|
* From code orinally in TCP
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
|
|
#include <net/inet_hashtables.h>
|
|
#include <net/inet_timewait_sock.h>
|
|
|
|
/* Must be called with locally disabled BHs. */
|
|
void __inet_twsk_kill(struct inet_timewait_sock *tw, struct inet_hashinfo *hashinfo)
|
|
{
|
|
struct inet_bind_hashbucket *bhead;
|
|
struct inet_bind_bucket *tb;
|
|
/* Unlink from established hashes. */
|
|
struct inet_ehash_bucket *ehead = &hashinfo->ehash[tw->tw_hashent];
|
|
|
|
write_lock(&ehead->lock);
|
|
if (hlist_unhashed(&tw->tw_node)) {
|
|
write_unlock(&ehead->lock);
|
|
return;
|
|
}
|
|
__hlist_del(&tw->tw_node);
|
|
sk_node_init(&tw->tw_node);
|
|
write_unlock(&ehead->lock);
|
|
|
|
/* Disassociate with bind bucket. */
|
|
bhead = &hashinfo->bhash[inet_bhashfn(tw->tw_num, hashinfo->bhash_size)];
|
|
spin_lock(&bhead->lock);
|
|
tb = tw->tw_tb;
|
|
__hlist_del(&tw->tw_bind_node);
|
|
tw->tw_tb = NULL;
|
|
inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
|
|
spin_unlock(&bhead->lock);
|
|
#ifdef SOCK_REFCNT_DEBUG
|
|
if (atomic_read(&tw->tw_refcnt) != 1) {
|
|
printk(KERN_DEBUG "%s timewait_sock %p refcnt=%d\n",
|
|
tw->tw_prot->name, tw, atomic_read(&tw->tw_refcnt));
|
|
}
|
|
#endif
|
|
inet_twsk_put(tw);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(__inet_twsk_kill);
|
|
|
|
/*
|
|
* Enter the time wait state. This is called with locally disabled BH.
|
|
* Essentially we whip up a timewait bucket, copy the relevant info into it
|
|
* from the SK, and mess with hash chains and list linkage.
|
|
*/
|
|
void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
|
|
struct inet_hashinfo *hashinfo)
|
|
{
|
|
const struct inet_sock *inet = inet_sk(sk);
|
|
const struct inet_connection_sock *icsk = inet_csk(sk);
|
|
struct inet_ehash_bucket *ehead = &hashinfo->ehash[sk->sk_hashent];
|
|
struct inet_bind_hashbucket *bhead;
|
|
/* Step 1: Put TW into bind hash. Original socket stays there too.
|
|
Note, that any socket with inet->num != 0 MUST be bound in
|
|
binding cache, even if it is closed.
|
|
*/
|
|
bhead = &hashinfo->bhash[inet_bhashfn(inet->num, hashinfo->bhash_size)];
|
|
spin_lock(&bhead->lock);
|
|
tw->tw_tb = icsk->icsk_bind_hash;
|
|
BUG_TRAP(icsk->icsk_bind_hash);
|
|
inet_twsk_add_bind_node(tw, &tw->tw_tb->owners);
|
|
spin_unlock(&bhead->lock);
|
|
|
|
write_lock(&ehead->lock);
|
|
|
|
/* Step 2: Remove SK from established hash. */
|
|
if (__sk_del_node_init(sk))
|
|
sock_prot_dec_use(sk->sk_prot);
|
|
|
|
/* Step 3: Hash TW into TIMEWAIT half of established hash table. */
|
|
inet_twsk_add_node(tw, &(ehead + hashinfo->ehash_size)->chain);
|
|
atomic_inc(&tw->tw_refcnt);
|
|
|
|
write_unlock(&ehead->lock);
|
|
}
|
|
|
|
struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, const int state)
|
|
{
|
|
struct inet_timewait_sock *tw = kmem_cache_alloc(sk->sk_prot_creator->twsk_slab,
|
|
SLAB_ATOMIC);
|
|
if (tw != NULL) {
|
|
const struct inet_sock *inet = inet_sk(sk);
|
|
|
|
/* Give us an identity. */
|
|
tw->tw_daddr = inet->daddr;
|
|
tw->tw_rcv_saddr = inet->rcv_saddr;
|
|
tw->tw_bound_dev_if = sk->sk_bound_dev_if;
|
|
tw->tw_num = inet->num;
|
|
tw->tw_state = TCP_TIME_WAIT;
|
|
tw->tw_substate = state;
|
|
tw->tw_sport = inet->sport;
|
|
tw->tw_dport = inet->dport;
|
|
tw->tw_family = sk->sk_family;
|
|
tw->tw_reuse = sk->sk_reuse;
|
|
tw->tw_hashent = sk->sk_hashent;
|
|
tw->tw_ipv6only = 0;
|
|
tw->tw_prot = sk->sk_prot_creator;
|
|
atomic_set(&tw->tw_refcnt, 1);
|
|
inet_twsk_dead_node_init(tw);
|
|
}
|
|
|
|
return tw;
|
|
}
|