CODEWITHSUNDEEP
openflowryu
passsp
passsp

Reputation: 61

Ryu framework, tcp_flags in parser.OFPMatch

I am trying to match flow in openflow-compatible switch (openflow 1.5) by using ryu framework.

As far as I know, openflow version 1.5 supports 'tcp_flags' match conditions, and Ryu also does.

So, when I am trying to code like: 

    match = parser.OFPMatch(
        tcp_flags=0x000
        )

nothing happens in flow table, while I am expecting to occur a new flow entry.

Ingress packet contains empty value for tcp flags.

Does anyone knows, how to code such kind of condition in a ryu?

Thanks.

Upvotes: 2

Views: 957

Answers (1)

passsp
passsp

Reputation: 61

match = parser.OFPMatch(
    eth_type=0x0800, 
    ip_proto=6, 
    tcp_flags=0x000
    )

solved my problem. According to 'OpenFlow Switch Specification', before use of 'tcp_flags', some prerequisite fields should be met. In my case, 'tcp_flags' field needs 'eth_type = 0x8000' and 'ip_proto = 6' fields placed before.

Upvotes: 3

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