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[SOCK]: Introduce sk_clone

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Out of tcp_create_openreq_child, will be used in
dccp_create_openreq_child, and is a nice sock function anyway.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo
2005-08-09 20:10:12 -07:00
committed by David S. Miller
parent c676270bcd
commit 87d11ceb9d
3 changed files with 79 additions and 67 deletions
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74
net/core/sock.c
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@ -700,6 +700,80 @@ void sk_free(struct sock *sk)
module_put(owner);
}
struct sock *sk_clone(const struct sock *sk, const unsigned int __nocast priority)
{
struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0);
if (newsk != NULL) {
struct sk_filter *filter;
memcpy(newsk, sk, sk->sk_prot->obj_size);
/* SANITY */
sk_node_init(&newsk->sk_node);
sock_lock_init(newsk);
bh_lock_sock(newsk);
atomic_set(&newsk->sk_rmem_alloc, 0);
atomic_set(&newsk->sk_wmem_alloc, 0);
atomic_set(&newsk->sk_omem_alloc, 0);
skb_queue_head_init(&newsk->sk_receive_queue);
skb_queue_head_init(&newsk->sk_write_queue);
rwlock_init(&newsk->sk_dst_lock);
rwlock_init(&newsk->sk_callback_lock);
newsk->sk_dst_cache = NULL;
newsk->sk_wmem_queued = 0;
newsk->sk_forward_alloc = 0;
newsk->sk_send_head = NULL;
newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
sock_reset_flag(newsk, SOCK_DONE);
skb_queue_head_init(&newsk->sk_error_queue);
filter = newsk->sk_filter;
if (filter != NULL)
sk_filter_charge(newsk, filter);
if (unlikely(xfrm_sk_clone_policy(newsk))) {
/* It is still raw copy of parent, so invalidate
* destructor and make plain sk_free() */
newsk->sk_destruct = NULL;
sk_free(newsk);
newsk = NULL;
goto out;
}
newsk->sk_err = 0;
newsk->sk_priority = 0;
atomic_set(&newsk->sk_refcnt, 2);
/*
* Increment the counter in the same struct proto as the master
* sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
* is the same as sk->sk_prot->socks, as this field was copied
* with memcpy).
*
* This _changes_ the previous behaviour, where
* tcp_create_openreq_child always was incrementing the
* equivalent to tcp_prot->socks (inet_sock_nr), so this have
* to be taken into account in all callers. -acme
*/
sk_refcnt_debug_inc(newsk);
newsk->sk_socket = NULL;
newsk->sk_sleep = NULL;
if (newsk->sk_prot->sockets_allocated)
atomic_inc(newsk->sk_prot->sockets_allocated);
}
out:
return newsk;
}
EXPORT_SYMBOL_GPL(sk_clone);
void __init sk_init(void)
{
if (num_physpages <= 4096) {