From 6a5dc9e598fe90160fee7de098fa319665f5253e Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 29 Apr 2013 08:39:56 +0000 Subject: net: Add MIB counters for checksum errors Add MIB counters for checksum errors in IP layer, and TCP/UDP/ICMP layers, to help diagnose problems. $ nstat -a | grep Csum IcmpInCsumErrors 72 0.0 TcpInCsumErrors 382 0.0 UdpInCsumErrors 463221 0.0 Icmp6InCsumErrors 75 0.0 Udp6InCsumErrors 173442 0.0 IpExtInCsumErrors 10884 0.0 Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/tcp_ipv4.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'net/ipv4/tcp_ipv4.c') diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 2278669..8ea9751 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1866,6 +1866,7 @@ discard: return 0; csum_err: + TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); goto discard; } @@ -1985,7 +1986,7 @@ int tcp_v4_rcv(struct sk_buff *skb) * provided case of th->doff==0 is eliminated. * So, we defer the checks. */ if (!skb_csum_unnecessary(skb) && tcp_v4_checksum_init(skb)) - goto bad_packet; + goto csum_error; th = tcp_hdr(skb); iph = ip_hdr(skb); @@ -2051,6 +2052,8 @@ no_tcp_socket: goto discard_it; if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { +csum_error: + TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); bad_packet: TCP_INC_STATS_BH(net, TCP_MIB_INERRS); } else { @@ -2072,10 +2075,13 @@ do_time_wait: goto discard_it; } - if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { - TCP_INC_STATS_BH(net, TCP_MIB_INERRS); + if (skb->len < (th->doff << 2)) { inet_twsk_put(inet_twsk(sk)); - goto discard_it; + goto bad_packet; + } + if (tcp_checksum_complete(skb)) { + inet_twsk_put(inet_twsk(sk)); + goto csum_error; } switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { case TCP_TW_SYN: { -- cgit v1.1