diff options
author | Arnaldo Carvalho de Melo <acme@ghostprotocols.net> | 2005-08-10 05:10:12 +0200 |
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committer | David S. Miller <davem@sunset.davemloft.net> | 2005-08-30 00:42:36 +0200 |
commit | 87d11ceb9deb7a3f13fdee6e89d9bb6be7d27a71 (patch) | |
tree | 3b5f6f15a76e6d58e5088cad707859390757181a /net/core | |
parent | [INET_TWSK]: Introduce inet_twsk_alloc (diff) | |
download | linux-87d11ceb9deb7a3f13fdee6e89d9bb6be7d27a71.tar.xz linux-87d11ceb9deb7a3f13fdee6e89d9bb6be7d27a71.zip |
[SOCK]: Introduce sk_clone
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>
Diffstat (limited to 'net/core')
-rw-r--r-- | net/core/sock.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index aba31fedf2ac..ccd10fd65682 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -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) { |