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authorEric Dumazet <edumazet@google.com>2015-10-04 21:08:11 -0700
committerDavid S. Miller <davem@davemloft.net>2015-10-05 02:45:27 -0700
commita1a5344ddbe8fd3e080013b317ac9a664490cfdf (patch)
tree75c793a05dd64db3df05f804e429bae45ead20d1 /net
parent004a5d0140ce1d05c1f5fce5df4baa2717a330e0 (diff)
tcp: avoid two atomic ops for syncookies
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>
Diffstat (limited to 'net')
-rw-r--r--net/dccp/ipv4.c2
-rw-r--r--net/dccp/ipv6.c2
-rw-r--r--net/ipv4/syncookies.c2
-rw-r--r--net/ipv4/tcp_input.c8
-rw-r--r--net/ipv6/syncookies.c2
5 files changed, 9 insertions, 7 deletions
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 8910c9567719..8e99681c8189 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -595,7 +595,7 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
goto drop;
- req = inet_reqsk_alloc(&dccp_request_sock_ops, sk);
+ req = inet_reqsk_alloc(&dccp_request_sock_ops, sk, true);
if (req == NULL)
goto drop;
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 1361a3f45df7..aed314f8c7c6 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -319,7 +319,7 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
goto drop;
- req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk);
+ req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true);
if (req == NULL)
goto drop;
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 729ceb5f63c6..8113c30ccf96 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -326,7 +326,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
goto out;
ret = NULL;
- req = inet_reqsk_alloc(&tcp_request_sock_ops, sk); /* for safety */
+ req = inet_reqsk_alloc(&tcp_request_sock_ops, sk, false); /* for safety */
if (!req)
goto out;
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index a95c8eb04ff7..ddadb318e850 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -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;
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index 7606eba83e7b..f610b5310b17 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -170,7 +170,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
goto out;
ret = NULL;
- req = inet_reqsk_alloc(&tcp6_request_sock_ops, sk);
+ req = inet_reqsk_alloc(&tcp6_request_sock_ops, sk, false);
if (!req)
goto out;