def __init__(self, action=NONE, pkt=None):
"""Initialize
@param action NONE (default), DROP, GET, FLOOD
@param packet dpkt parsed packet
"""
actions.__init__(self)
packet.__init__(self, pkt)
##Match
self.match = pyof.ofp_match()
##Idle timeout
self.idle_timeout = DEFAULT_TIMEOUT
##Hard timeout
self.hard_timeout = pyof.OFP_FLOW_PERMANENT
##Priority
self.priority = pyof.OFP_DEFAULT_PRIORITY
##Out port
self.out_port = pyof.OFPP_NONE
##Flags
self.flags = 0
if action == flow_entry.GET:
self.add_output(pyof.OFPP_CONTROLLER)
elif action == flow_entry.FLOOD:
self.add_output(pyof.OFPP_FLOOD)
def get_ofp_match(in_port, packet):
"""Generate ofp_match from raw packet
Note that OpenFlow uses outermost Ethertype, while dokt provides
the innermost one. And VLAN tag parsing is manually done.
@param in_port input port of packet
@param packet raw packet
@return (ofp match, dpkt's packet)
"""
ofm = pyof.ofp_match()
pkt = dpkt.ethernet.Ethernet(packet)
#In Port
ofm.in_port = in_port
#Get Ethernet
ofm.dl_src = pu.byte_str2array(pkt.src)
ofm.dl_dst = pu.byte_str2array(pkt.dst)
ofm.dl_type = struct.unpack('>H',packet[12:14])[0]
#802.1Q VLAN
if (ofm.dl_type == dpkt.ethernet.ETH_TYPE_8021Q):
ofm.dl_vlan = pkt.tag & VLAN_ID_MASK
ofm.dl_vlan_pcp = (pkt.tag & VLAN_PRIORITY_MASK) >> VLAN_PRIORITY_SHIFT
#Get IP if any
if (isinstance(pkt.data, dpkt.ip.IP)):
__get_ip_ofp_match(ofm, pkt.data)
elif (isinstance(pkt.data, dpkt.arp.ARP)):
__get_arp_ofp_match(ofm, pkt.data)
return (ofm, pkt)
