How to use match

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

Built-in fields are:

FIELD	TYPE	EXAMPLE
switch	int	4
inport	int	3
outport	int	2
srcmac	EthAddr	EthAddr('00:00:00:00:00:01')
dstmac	EthAddr	EthAddr('00:00:00:00:00:03')
srcip	IPAddr or string	IPAddr('10.0.1.1'), '10.0.0.0/24'
dstip	IPAddr or string	IPAddr('10.0.1.2'), '10.0.0.1/24'
tos	int	0
srcport	int	80
dstport	int	8080
ethtype	int	1
protocol	int	7
vlan_id	int	0
vlan_pcp	int	0

Examples: ``` from pyretic.core import packet match(srcip=IPAddr("1.1.1.2")) match(srcip="1.1.1.0/24")) match(srcmac=EthAddr("00:00:00:00:00:01")) match(switch=4) match(dstport=8080, ethtype=packet.IPV4, protocl=packet.TCP_PROTO) ```

match also supports multiple field value pairs seperated by a comma - e.g.,

match(switch=4, srcmac=MAC("00:00:00:00:00:01"))

which means exactly the same thing as

match(switch=4) & match(srcmac=MAC("00:00:00:00:00:01"))