tcp: md5: increment sk_drops on syn_recv state
TCP MD5 mismatches do increment sk_drops counter in all states but
SYN_RECV.
This is very unlikely to happen in the real world, but worth adding
to help diagnostics.
We increase the parent (listener) sk_drops.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 32b048e..436d978 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1602,6 +1602,7 @@
sk = req->rsk_listener;
if (unlikely(tcp_v4_inbound_md5_hash(sk, skb))) {
+ sk_drops_add(sk, skb);
reqsk_put(req);
goto discard_it;
}