def udt_receive(self):
fr_S = self.intf_L[0].get('in')
if fr_S is None:
return
#decapsulate the network packet
fr = LinkFrame.from_byte_S(fr_S)
assert(fr.type_S == 'Network') #should be receiving network packets by hosts
pkt_S = fr.data_S
print('%s: received packet "%s"' % (self, pkt_S))
def process_queues(self):
for i in range(len(self.intf_L)):
fr_S = None #make sure we are starting the loop with a blank frame
fr_S = self.intf_L[i].get('in') #get frame from interface i
if fr_S is None:
continue # no frame to process yet
#decapsulate the packet
fr = LinkFrame.from_byte_S(fr_S)
pkt_S = fr.data_S
#process the packet as network, or MPLS
if fr.type_S == "Network":
p = NetworkPacket.from_byte_S(pkt_S) #parse a packet out
self.process_network_packet(p, i)
elif fr.type_S == "MPLS":
# TODO: handle MPLS frames
m_fr = MPLSFrame.from_byte_S(pkt_S) #parse a frame out
#send the MPLS frame for processing
self.process_MPLS_frame(m_fr, i)
else:
raise ('%s: unknown frame type: %s' % (self, fr.type_S))