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authorEric Dumazet <eric.dumazet@gmail.com>2010-03-07 23:21:57 +0000
committerDavid S. Miller <davem@davemloft.net>2010-03-08 10:45:27 -0800
commit6cce09f87a04797fae5b947ef2626c14a78f0b49 (patch)
treea1d7638f9571a29db9bc5c5d8e0baee19597d59e /net/ipv6/tcp_ipv6.c
parent4045635318538d3ddd2007720412fdc4b08f6a62 (diff)
downloadop-kernel-dev-6cce09f87a04797fae5b947ef2626c14a78f0b49.zip
op-kernel-dev-6cce09f87a04797fae5b947ef2626c14a78f0b49.tar.gz
tcp: Add SNMP counters for backlog and min_ttl drops
Commit 6b03a53a (tcp: use limited socket backlog) added the possibility of dropping frames when backlog queue is full. Commit d218d111 (tcp: Generalized TTL Security Mechanism) added the possibility of dropping frames when TTL is under a given limit. This patch adds new SNMP MIB entries, named TCPBacklogDrop and TCPMinTTLDrop, published in /proc/net/netstat in TcpExt: line netstat -s | egrep "TCPBacklogDrop|TCPMinTTLDrop" TCPBacklogDrop: 0 TCPMinTTLDrop: 0 Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
-rw-r--r--net/ipv6/tcp_ipv6.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 2c378b1..9b6dbba 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1740,8 +1740,9 @@ process:
if (!tcp_prequeue(sk, skb))
ret = tcp_v6_do_rcv(sk, skb);
}
- } else if (sk_add_backlog(sk, skb)) {
+ } else if (unlikely(sk_add_backlog(sk, skb))) {
bh_unlock_sock(sk);
+ NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
goto discard_and_relse;
}
bh_unlock_sock(sk);
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