Hi, On 2016年05月07日 01:17, Randa Alani wrote: > Thank you for replaying, I know this file but what I am trying to do is the > following: > > Normally(I think) an option can by written as this: > > option = '\x03\x03\x03' > > and included in the tcp protocol. But I want to do the following: > > mcw = int(log(window_scale, 2)) > > shift_cnt = mcw > > option = '\x03\x03\mcw' > > I mean that I want to inject the value of mcw in this string but I do not > know how to work it with (\xnn).
the "option" field should be a list of TCPOption sub-classes or an bytearray. Please refer to the following snippet. >>> mcw = 5 >>> option = [tcp.TCPOptionWindowScale(mcw)] >>> pkt = tcp.tcp(option=option) Or, directly, >>> option = b'\x03\x03\x05\x00' # b'\x00' is a padding >>> pkt = tcp.tcp(option=option) Thanks, Iwase > > Please advice > > Kind regards, > > Randa > > *From:*Ramana Reddy [mailto:gtvrre...@gmail.com] > *Sent:* 06 May 2016 17:07 > *To:* Randa Alani <el...@leeds.ac.uk> > *Cc:* ryu-devel@lists.sourceforge.net > *Subject:* Re: [Ryu-devel] TCP options (Randa Alani) > > Recently ryu added the feature to serialize/parse the tcp option. Please look > at the this file: > https://github.com/osrg/ryu/blob/master/ryu/lib/packet/tcp.py > > Hope this helps, > > Regards, > > Ramana > > On Fri, May 6, 2016 at 8:17 PM, Randa Alani <el...@leeds.ac.uk > <mailto:el...@leeds.ac.uk>> wrote: > > Dear all > > I just wanted to add that the shift_cnt is not a constant as I described > before, instead it is a variable that presents an equation. > > mcw = int(log(window_scale, 2)) > > shift_cnt = mcw > > Please advise > > Kind regards, > > Randa > > > > ------------------------------------------------------------------------------ > Find and fix application performance issues faster with Applications > Manager > Applications Manager provides deep performance insights into multiple > tiers of > your business applications. It resolves application problems quickly and > reduces your MTTR. Get your free trial! > https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > _______________________________________________ > Ryu-devel mailing list > Ryu-devel@lists.sourceforge.net <mailto:Ryu-devel@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/ryu-devel > > > > ------------------------------------------------------------------------------ > Find and fix application performance issues faster with Applications Manager > Applications Manager provides deep performance insights into multiple tiers of > your business applications. It resolves application problems quickly and > reduces your MTTR. Get your free trial! > https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > > > > _______________________________________________ > Ryu-devel mailing list > Ryu-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/ryu-devel > ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Ryu-devel mailing list Ryu-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ryu-devel
