Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
probe::ipmib.ForwDatagrams - Count forwarded packet
SYNOPSIS
ipmib.ForwDatagrams
VALUES
op
value to be added to the counter (default value of 1)
skb
pointer to the struct sk_buff being acted on
DESCRIPTION
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 ForwDatagrams (equivalent to SNMP's MIB IPSTATS_MIB_OUTFORWDATAGRAMS)
SystemTap Tapset Reference March 2016 PROBE::IPMIB.FORWD(3stap)