How does counter value for icmp OutEchos changes in /proc/net/snmp

[Anuz Pratap Singh Tomar <chambilkethakur@xxxxxxxxx>]

Hi All,
If someone can point me out as to where to exactly look for change in value of icmp counters in /proc/net/, I am specifically looking for OutEchos for snmp. But, I couldn't locate anything specific to what is the general mechanism.

I looked in net/ipv4/proc.c, where the value gets printed in string:

static int snmp_seq_show(struct seq_file *seq, void *v) {
..................................
seq_puts(seq, "\nIcmp:");
        for (i = 0; snmp4_icmp_list[i].name != NULL; i++)

                seq_printf(seq, " %s", snmp4_icmp_list[i].name);

        seq_puts(seq, "\nIcmp:");
        for (i = 0; snmp4_icmp_list[i].name != NULL; i++)
                seq_printf(seq, " %lu",

                           fold_field((void **) icmp_statistics,
                                      snmp4_icmp_list[i].entry));

...............................................


}

but this only prints value in seq buffer,  I wanted to know how this entire mechanism work, I mean how does counter increment/decrement happens. Any pointer in this regard?

Thank you
-Anuz