Hi,
On 2015年12月08日 13:57, nitish nagesh wrote:
> Hello,
>
> I am trying to modify the existing example script to generate a packet out
> for every packet-in. My requirement is to send a packet out message to the
> switch with the Packet-Out payload containing a 802.1Q VLAN tag of the
> controller VID. In other words, irrespective of what packet was sent in the
> packet-in message i send this crafted packet in the packet-out with all hard
> coded packet fields. Following is the handler function:
> /
>
> @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
> def packet_in_handler(self, ev):
> msg = ev.msg
> dp = msg.datapath
> ofp = dp.ofproto
> ofp_parser = dp.ofproto_parser
>
> /
> / /* Construct payload packet */
> /
> / e = ethernet.ethernet(DST_MAC_ADDRESS,
> SRC_MAC_ADDRESS,
> ether.ETH_TYPE_IP)
>
> ip = ipv4.ipv4(4, header_length, tos, total_length, identification,
> 0, 0, IPV4_TTL, inet.IPPROTO_UDP, 0,
> primary_ip_address, IPV4_DST_ADDRESS)
> p = packet.Packet()
> p.add_protocol(e)
> if vlan_id is not None:
> vlan_ = vlan.vlan(0, 0, vlan_id, e.ethertype)
> e.ethertype = ether.ETH_TYPE_8021Q
> p.add_protocol(vlan_)
> p.add_protocol(ip)
>
> /
> / */* HOW DO I ASSOCIATE Packet 'p' TO THE PKT-OUT PAYLOAD HERE? */*
> /
> /
> actions = [ofp_parser.OFPActionOutput(ofp.OFPP_FLOOD)]
> out = ofp_parser.OFPPacketOut(
> datapath=dp, buffer_id=msg.buffer_id, in_port=msg.in_port,
> actions=actions)
> dp.send_msg(out)/
>
>
> However i am unable to figure out how to associate the crafted packet (p) to
> the packet-out payload. I am newbie to python/RYU programming. Please help.
First, please serialize packet.Packet() instance and set binary data into
ofp_parser.OFPPacketOut() args.
Then, how about the following?
/* Construct payload packet */
...
...
p.add_protocol(ip)
p.serialize() # serialize packet data
actions = [ofp_parser.OFPActionOutput(ofp.OFPP_FLOOD)]
out = ofp_parser.OFPPacketOut(
datapath=dp, buffer_id=msg.buffer_id, in_port=msg.in_port,
actions=actions, data=p.data) # p.data is the binary packet data
For more infomations for packet library, please refer to this page.
http://osrg.github.io/ryu-book/en/html/packet_lib.html
Thanks,
Iwase
>
> Thanks,
> Nitish
>
>
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