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

NAME
probe::udp.recvmsg - Fires whenever a UDP message is received
SYNOPSIS
udp.recvmsg
VALUES
saddr
A string representing the source IP address
dport
UDP destination port
size
Number of bytes received by the process
sock
Network socket used by the process
sport
UDP source port
daddr
A string representing the destination IP address
family
IP address family
name
The name of this probe
CONTEXT
The process which received a UDP message
SystemTap Tapset Reference March 2016 PROBE::UDP.RECVMSG(3stap)