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| author |   Eric Dumazet <eric.dumazet@gmail.com> | 2010-03-07 23:21:57 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2010-03-08 10:45:27 -0800 |
| commit | 6cce09f87a04797fae5b947ef2626c14a78f0b49 (patch) | |
| tree | a1d7638f9571a29db9bc5c5d8e0baee19597d59e /net/ipv4 | |
| parent | net: add __must_check to sk_add_backlog (diff) | |
| download | linux-dev-6cce09f87a04797fae5b947ef2626c14a78f0b49.tar.xz linux-dev-6cce09f87a04797fae5b947ef2626c14a78f0b49.zip | |
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/ipv4')
| -rw-r--r-- | net/ipv4/proc.c | 2 | ||||
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 7 |
2 files changed, 7 insertions, 2 deletions
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 242ed2307370..4f1f337f4337 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -249,6 +249,8 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED), SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED), SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK), + SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP), + SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP), SNMP_MIB_SENTINEL }; diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 1915f7dc30e6..8d51d39ad1bb 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1651,8 +1651,10 @@ int tcp_v4_rcv(struct sk_buff *skb) if (!sk) goto no_tcp_socket; - if (iph->ttl < inet_sk(sk)->min_ttl) + if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { + NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); goto discard_and_relse; + } process: if (sk->sk_state == TCP_TIME_WAIT) @@ -1682,8 +1684,9 @@ process: if (!tcp_prequeue(sk, skb)) ret = tcp_v4_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); |