netdev - iproute2/nstat: Bug in displaying icmp stats

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Date:	Fri, 5 Dec 2014 15:35:10 -0800
From:	Vijay Subramanian <subramanian.vijay@...il.com>
To:	netdev <netdev@...r.kernel.org>
Subject: iproute2/nstat: Bug in displaying icmp stats

Hi,

I noticed nstat is displaying icmp stats incorrectly.

$ cat /proc/net/snmp | grep Icmp | head -2 | awk '{print $1 " " $2 " "
$3 " " $4}'
Icmp: InMsgs InErrors InCsumErrors
Icmp: 215 0 0

$ nstat  -az | grep IcmpIn  | head -3
IcmpInMsgs                      0                  0.0
IcmpInErrors                    215                0.0
IcmpInCsumErrors                0                  0.0

For example, as seen in /proc/net/snmp, IcmpInMsgs should be 215 but
that value is assigned to IcmpInErrors.

The issue seems to be the way the values are populated.

$vim +209 misc/nstat.c
-----x----

                       /* Trick to skip "dummy" trailing ICMP MIB in 2.4 */

                        if (strcmp(idbuf, "IcmpOutAddrMaskReps") == 0)

                                idbuf[5] = 0;

                        else

                                n = n->next;

-----x------

It seems "IcmpOutAddrMaskReps" is processed twice and values assigned
are off by one.

Any idea what the code is doing for 2.4 kernel and how to fix this?

vijay
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