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authorEric Dumazet <eric.dumazet@gmail.com>2010-03-07 18:21:57 -0500
committerDavid S. Miller <davem@davemloft.net>2010-03-08 13:45:27 -0500
commit6cce09f87a04797fae5b947ef2626c14a78f0b49 (patch)
treea1d7638f9571a29db9bc5c5d8e0baee19597d59e /net/ipv4
parent4045635318538d3ddd2007720412fdc4b08f6a62 (diff)
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.c2
-rw-r--r--net/ipv4/tcp_ipv4.c7
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[] = {
249 SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED), 249 SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
250 SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED), 250 SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
251 SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK), 251 SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
252 SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
253 SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
252 SNMP_MIB_SENTINEL 254 SNMP_MIB_SENTINEL
253}; 255};
254 256
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)
1651 if (!sk) 1651 if (!sk)
1652 goto no_tcp_socket; 1652 goto no_tcp_socket;
1653 1653
1654 if (iph->ttl < inet_sk(sk)->min_ttl) 1654 if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) {
1655 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
1655 goto discard_and_relse; 1656 goto discard_and_relse;
1657 }
1656 1658
1657process: 1659process:
1658 if (sk->sk_state == TCP_TIME_WAIT) 1660 if (sk->sk_state == TCP_TIME_WAIT)
@@ -1682,8 +1684,9 @@ process:
1682 if (!tcp_prequeue(sk, skb)) 1684 if (!tcp_prequeue(sk, skb))
1683 ret = tcp_v4_do_rcv(sk, skb); 1685 ret = tcp_v4_do_rcv(sk, skb);
1684 } 1686 }
1685 } else if (sk_add_backlog(sk, skb)) { 1687 } else if (unlikely(sk_add_backlog(sk, skb))) {
1686 bh_unlock_sock(sk); 1688 bh_unlock_sock(sk);
1689 NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
1687 goto discard_and_relse; 1690 goto discard_and_relse;
1688 } 1691 }
1689 bh_unlock_sock(sk); 1692 bh_unlock_sock(sk);