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tcp: avoid two atomic ops for syncookies

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inet_reqsk_alloc() is used to allocate a temporary request
in order to generate a SYNACK with a cookie. Then later,
syncookie validation also uses a temporary request.

These paths already took a reference on listener refcount,
we can avoid a couple of atomic operations.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2015-10-04 21:08:11 -07:00
committed by David S. Miller
parent 004a5d0140
commit a1a5344ddb
7 changed files with 19 additions and 11 deletions
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11
include/net/request_sock.h
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@@ -80,7 +80,8 @@ static inline struct sock *req_to_sk(struct request_sock *req)
}
static inline struct request_sock *
reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk_listener)
reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk_listener,
bool attach_listener)
{
struct request_sock *req;
@@ -88,8 +89,12 @@ reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk_listener)
if (req) {
req->rsk_ops = ops;
sock_hold(sk_listener);
req->rsk_listener = sk_listener;
if (attach_listener) {
sock_hold(sk_listener);
req->rsk_listener = sk_listener;
} else {
req->rsk_listener = NULL;
}
req_to_sk(req)->sk_prot = sk_listener->sk_prot;
sk_node_init(&req_to_sk(req)->sk_node);
sk_tx_queue_clear(req_to_sk(req));