Good afternoon everyone,
I am experimenting with handling custom protocols with Ryu, but am unable
to parse the new protocols at the switch or controller.
I have created a custom protocol with Scapy that simple holds 3 IntFields
(4 bytes each) and 2 ShortFields (2 bytes each). I create a packet with
Scapy that has several standard protocols (ethernet, ipv4, tcp, etc.) as
well as our custom created protocol.
I modified the Ryu switch to print out all the protocols of each packet
received during a "Packet_In" event. The standard protocols get printed
naturally:
ethernet(dst='ea:b1:d3:52:39:b5',ethertype=2048,src='2e:3a:92:b5:df:c0')
ipv4(csum=25275,dst='10.0.2.3',flags=0,header_length=5,identification=1,offset=0,option=None,proto=6,src='10.0.2.2',tos=0,total_length=56,ttl=64,version=4)
tcp(ack=0,bits=2,csum=48080,dst_port=14450,offset=5,option=None,seq=0,src_port=33666,urgent=0,window_size=8192),
but the custom protocol gets printed as:
'\x00\x00\x00\x05\x00\x00\x00\x03\x00\x00\x00\x01\x00\x00\x00\x00'
Where 5, 3, 1, 0, 0 are the values set for the fields in the custom
protocol.
In the Ryu code base, I defined my custom protocol class (in a new file
saved in the packet subfolder), using the other protocols as a guide.
Any help you could provide in this regard would be greatly appreciated.
Sam
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