How to use match

match(f=v): match packets whose field f has value v

builtin fields are:

FIELD	TYPE	E.G.
switch	int	4
inport	int	3
outport	int	2
srcmac	MAC	MAC('00:00:00:00:00:01')
dstmac	MAC	MAC('00:00:00:00:00:03')
srcip	IP,string	IP('10.0.1.1'), '10.0.0/24'
dstip	IP,string	IP('10.0.1.2'), '10.0.1/24'
tos	int	0
srcport	int	80
dstport	int	8080
ethtype	int	1
protocol	int	7
vlan_id	int	0
vlan_pcp	int	0

e.g., match(srcip=IP("1.1.1.2")) match(srcmac=MAC("00:00:00:00:00:01")) match(switch=4)