From e65c332de8a0c9f570847ec490b60effffcd5320 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 24 Aug 2016 08:50:24 -0700 Subject: [PATCH] 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 Acked-by: Neal Cardwell Signed-off-by: David S. Miller --- net/ipv4/tcp_ipv4.c | 1 + net/ipv6/tcp_ipv6.c | 1 + 2 files changed, 2 insertions(+) diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 32b048e524d6..436d978c6c39 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1602,6 +1602,7 @@ process: sk = req->rsk_listener; if (unlikely(tcp_v4_inbound_md5_hash(sk, skb))) { + sk_drops_add(sk, skb); reqsk_put(req); goto discard_it; } diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index e0f46439e391..ac0ed7bda406 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1409,6 +1409,7 @@ process: sk = req->rsk_listener; tcp_v6_fill_cb(skb, hdr, th); if (tcp_v6_inbound_md5_hash(sk, skb)) { + sk_drops_add(sk, skb); reqsk_put(req); goto discard_it; } -- 2.20.1