Thank you for the response Iwase,
Originally my protocol did not reserve any tcp ports. However, in order to
test your solution, I added TCP ports with unique values to the protocol,
and implemented your changes.
Unfortunately, the result is the same (albeit with additional fields):
'\xad\x9c\xd9\x03\x00\x00\x00\x05\x00\x00\x00\x03\x00\x00\x00\x01\x00\x00\x00\x00'
Do you have any other suggestions or ideas about what may be causing this?
Thank you again,
Sam
On Wed, Jul 6, 2016 at 2:51 AM, Iwase Yusuke <[email protected]>
wrote:
> 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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