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>
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 992a1f9..dceff5f 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1167,7 +1167,8 @@
}
EXPORT_SYMBOL(tcp_v4_md5_hash_skb);
-static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
+static bool __tcp_v4_inbound_md5_hash(struct sock *sk,
+ const struct sk_buff *skb)
{
/*
* This gets called for each TCP segment that arrives
@@ -1220,6 +1221,17 @@
return false;
}
+static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
+{
+ bool ret;
+
+ rcu_read_lock();
+ ret = __tcp_v4_inbound_md5_hash(sk, skb);
+ rcu_read_unlock();
+
+ return ret;
+}
+
#endif
static void tcp_v4_init_req(struct request_sock *req, struct sock *sk,
@@ -1432,16 +1444,6 @@
int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
{
struct sock *rsk;
-#ifdef CONFIG_TCP_MD5SIG
- /*
- * We really want to reject the packet as early as possible
- * if:
- * o We're expecting an MD5'd packet and this is no MD5 tcp option
- * o There is an MD5 option and we're not expecting one
- */
- if (tcp_v4_inbound_md5_hash(sk, skb))
- goto discard;
-#endif
if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
struct dst_entry *dst = sk->sk_rx_dst;
@@ -1644,6 +1646,18 @@
if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
goto discard_and_relse;
+
+#ifdef CONFIG_TCP_MD5SIG
+ /*
+ * We really want to reject the packet as early as possible
+ * if:
+ * o We're expecting an MD5'd packet and this is no MD5 tcp option
+ * o There is an MD5 option and we're not expecting one
+ */
+ if (tcp_v4_inbound_md5_hash(sk, skb))
+ goto discard_and_relse;
+#endif
+
nf_reset(skb);
if (sk_filter(sk, skb))