Hey there,
I am just getting started using RYU and try to manually craft some
packets to send out. But I am running into some problems with that. I
hope you can point me into the right direction.
I have used the example from the docs
https://github.com/osrg/ryu/blob/master/doc/source/library_packet.rst#building-packet
to build my packet like this:
lbip = '192.168.4.42'
rewriteip = '192.168.4.201'
e = ethernet.ethernet('00:00:00:00:00:00', '08:60:6e:7f:74:e7',
ether.ETH_TYPE_8021Q)
a = arp.arp(hwtype=1, proto=0x0800, hlen=6, plen=4, opcode=2,
src_mac='08:60:6e:7f:74:e7', src_ip=self.lbip,
dst_mac='00:00:00:00:00:00', dst_ip=self.rewriteip)
p = packet.Packet()
p.add_protocol(e)
p.add_protocol(a)
p.serialize()
out = parser.OFPPacketOut(datapath=datapath,
in_port=ofproto.OFPP_CONTROLLER,
buffer_id=ofproto.OFP_NO_BUFFER,
actions=[parser.OFPActionOutput(ofproto.OFPP_FLOOD,0)],
data=p.data)
datapath.send_msg(out)
Doing so will trigger my switch to return an error message
error msg ev version: 0x4 msg_type 0x1 xid 0x671379c
OFPErrorMsg(code=12,data='\x04\r\x00R\x06q7\x9c\xff\xff\xff\xff\xff\xff\xff\xfd\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10\xff\xff\xff\xfb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x08`n\x7ft\xe7\x81\x00\x00\x01\x08\x00\x06\x04\x00\x02\x08`',type=1)
type 0x1 code 0xc 0x4 0xd 0x0 0x52 0x6 0x71 0x37 0x9c 0xff 0xff 0xff
0xff 0xff 0xff 0xff 0xfd 0x0 0x10 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0
0x0 0x10 0xff 0xff 0xff 0xfb 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0
0x0 0x0 0x0 0x0 0x8 0x60 0x6e 0x7f 0x74 0xe7 0x81 0x0 0x0 0x1 0x8
0x0 0x6 0x4 0x0 0x2 0x8 0x60
which I decoded to saying "Bad Request: Bad Packet".
I tried to look at the packet. Printed p.data in hex, it looks like this
00000000000008606e7f74e78100000108000604000208606e7f74e7c0a8042a000000000000c0a804c9
Which is of course totally wrong considering the ordering.
Can you guys maybe point me into the right direction to get the packet
right?
Thanks in advance!
Sebastian
P.S.: Replacing p.data with str(p) in the out message, will actually
have the switch write the string representation to the wire in ascii,
which is wrong as well, but doesn't return an error code.
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