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authorDmitry Popov <ixaphire@qrator.net>2014-08-07 02:38:22 +0400
committerDavid S. Miller <davem@davemloft.net>2014-08-06 16:00:20 -0700
commit9ea88a153001ffeb3d8810917e8eea62ca9b6f25 (patch)
tree5e0139567bed202fc110fbe1e78febe385f410ca /net/ipv6
parent269f8cb2608c7bdebadeb9a2061ba42dcd6d4ff7 (diff)
downloadlinux-9ea88a153001ffeb3d8810917e8eea62ca9b6f25.tar.bz2
tcp: md5: check md5 signature without socket lock
Since a8afca032 (tcp: md5: protects md5sig_info with RCU) tcp_md5_do_lookup doesn't require socket lock, rcu_read_lock is enough. Therefore socket lock is no longer required for tcp_v{4,6}_inbound_md5_hash too, so we can move these calls (wrapped with rcu_read_{,un}lock) before bh_lock_sock: from tcp_v{4,6}_do_rcv to tcp_v{4,6}_rcv. Signed-off-by: Dmitry Popov <ixaphire@qrator.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/tcp_ipv6.c25
1 files changed, 19 insertions, 6 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 22055b098428..f2ce95502392 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -667,7 +667,8 @@ clear_hash_noput:
return 1;
}
-static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
+static int __tcp_v6_inbound_md5_hash(struct sock *sk,
+ const struct sk_buff *skb)
{
const __u8 *hash_location = NULL;
struct tcp_md5sig_key *hash_expected;
@@ -707,6 +708,18 @@ static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
}
return 0;
}
+
+static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
+{
+ int ret;
+
+ rcu_read_lock();
+ ret = __tcp_v6_inbound_md5_hash(sk, skb);
+ rcu_read_unlock();
+
+ return ret;
+}
+
#endif
static void tcp_v6_init_req(struct request_sock *req, struct sock *sk,
@@ -1247,11 +1260,6 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
if (skb->protocol == htons(ETH_P_IP))
return tcp_v4_do_rcv(sk, skb);
-#ifdef CONFIG_TCP_MD5SIG
- if (tcp_v6_inbound_md5_hash(sk, skb))
- goto discard;
-#endif
-
if (sk_filter(sk, skb))
goto discard;
@@ -1424,6 +1432,11 @@ process:
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
goto discard_and_relse;
+#ifdef CONFIG_TCP_MD5SIG
+ if (tcp_v6_inbound_md5_hash(sk, skb))
+ goto discard_and_relse;
+#endif
+
if (sk_filter(sk, skb))
goto discard_and_relse;