commit 6a5dc9e598fe90160fee7de098fa319665f5253e
author Eric Dumazet <edumazet@google.com> Mon Apr 29 08:39:56 2013 +0000
committer David S. Miller <davem@davemloft.net> Mon Apr 29 15:14:03 2013 -0400
tree 7f2c2130e3dec81aea01e997cec7e87744f02694
parent f233a976ad15c3b8c54c0157f3c41d23f7514279

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 <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/icmp.c

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 3ac5dff..76e10b4 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -881,7 +881,7 @@
 	case CHECKSUM_NONE:
 		skb->csum = 0;
 		if (__skb_checksum_complete(skb))
-			goto error;
+			goto csum_error;
 	}
 
 	if (!pskb_pull(skb, sizeof(*icmph)))
@@ -929,6 +929,8 @@
 drop:
 	kfree_skb(skb);
 	return 0;
+csum_error:
+	ICMP_INC_STATS_BH(net, ICMP_MIB_CSUMERRORS);
 error:
 	ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
 	goto drop;