Please forgive me if I miss a simple solution of have a
flawed analysis. I am new to both ryu and to python.
Ive been using ryu to develop a controller algorithm. I make
use of the Packet libs to process OF packet in data.
When my ofswitch is connected to "the real world" it
receives LLDP frames from its upstream (non OF) HP switch
that are 170 octets of payload.
But the switch only sends 128 of those octets because thats
what controller/ofp_handler.py says to do around line 198:
set_config = ofproto_parser.OFPSetConfig(
datapath, ofproto.OFPC_FRAG_NORMAL,
128 # TODO:XXX
)
That is where miss_send_length is set to 128
The trouble comes when lib/packet/lldp.py is parsing the lldp
message. It is fine working through the tlvs until it runs out
of data then the assert len(buf) >= self.len + LLDP_TLV_SIZE
gets thrown.
The TLV in this case says it is 90 octets long, but the buf
doesn't have that much left.
So....
What would be the way to fix this?
- up the miss_send_length ?
- have lldp.py recognise it has run out of buf and stop parsing
in a somewhat gracefull fashion? (and only partially parse the packet)
- Just have packet lib stop parsing lldp (comment out the register)
So far I have taken the last option (simple, and I don't need
to parse lldp (yet :) )
Thoughts?
E
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