Count discarded inbound packets
ipmib.InDiscards
op
value to be added to the counter (default value of 1)
skb
pointer to the struct sk_buff being acted on
The packet pointed to by skb is filtered by the function ipmib_filter_key. If the packet passes the filter is is counted in the global InDiscards (equivalent to SNMP's MIB STATS_MIB_INDISCARDS)