Hi,
Does your custom protocol reserve any TCP src/dst port?
If you can define it, please modify the following to return your protocol class.
https://github.com/osrg/ryu/blob/master/ryu/lib/packet/tcp.py#L135
e.g.)
$ git diff
diff --git a/ryu/lib/packet/tcp.py b/ryu/lib/packet/tcp.py
index 1771b9a..1c3a15e 100644
--- a/ryu/lib/packet/tcp.py
+++ b/ryu/lib/packet/tcp.py
@@ -108,6 +108,13 @@ class tcp(packet_base.PacketBase):
mask = sum(flags)
return (self.bits & mask) == mask
+ @staticmethod
+ def get_packet_type(src_port, dst_port):
+ if (src_port == YOUR_PROTOCOL_PORT_NO or
+ dst_port == YOUR_PROTOCOL_PORT_NO):
+ return YourProtocolClass
+ return None
+
@classmethod
def parser(cls, buf):
(src_port, dst_port, seq, ack, offset, bits, window_size,
@@ -132,7 +139,7 @@ class tcp(packet_base.PacketBase):
msg = cls(src_port, dst_port, seq, ack, offset, bits,
window_size, csum, urgent, option)
- return msg, None, buf[length:]
+ return msg, cls.get_packet_type(src_port, dst_port), buf[length:]
def serialize(self, payload, prev):
offset = self.offset << 4
Thanks,
Iwase
On 2016年07月06日 03:04, Sam Snodgrass wrote:
> 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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