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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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8
net/ipv4/tcp_input.c
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@@ -6042,9 +6042,11 @@ static void tcp_openreq_init(struct request_sock *req,
}
struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
struct sock *sk_listener)
struct sock *sk_listener,
bool attach_listener)
{
struct request_sock *req = reqsk_alloc(ops, sk_listener);
struct request_sock *req = reqsk_alloc(ops, sk_listener,
attach_listener);
if (req) {
struct inet_request_sock *ireq = inet_rsk(req);
@@ -6143,7 +6145,7 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
goto drop;
}
req = inet_reqsk_alloc(rsk_ops, sk);
req = inet_reqsk_alloc(rsk_ops, sk, !want_cookie);
if (!req)
goto drop;