Please see "What are these log messages from the packet subsystem?" in the POX
FAQ.
-- Murphy
On Aug 19, 2014, at 1:29 PM, 张伟 <zhang...@126.com> wrote:
> Yes, just now I change the event to like that
> def _handle_PacketIn (event):
> packet = event.parsed
> msg = of.ofp_flow_mod()
> msg.match = of.ofp_match.from_packet(packet, event.port);
> msg.buffer_id = event.ofp.buffer_id
> msg.idle_timeout = 10
> msg.idle_timeout = 30
> msg.actions.append(of.ofp_action_output(port = 1))
> msg.data = event.ofp
> event.connection.send(msg)
>
> def launch ():
> '''
> Starting the Firewall module
> '''
> core.openflow.addListenerByName("PacketIn", _handle_PacketIn)
> log.info("test miss flow")
>
> It seems it can work. However, pox still gives this warning:
> INFO:packet:(udp parse) warning UDP packet data shorter than UDP len: 96 < 962
> INFO:packet:(udp parse) warning UDP packet data shorter than UDP len: 96 < 962
>
> Can you give some guidance, why it has this warning.
>
> This is my packet_in message
> void get_header(struct request *req, struct ofp_packet_in *pi)
> {
> char *header;
> struct rte_mbuf *pkt = req->pkt;
> header = (char *)(rte_pktmbuf_mtod(pkt, unsigned char *));
> memcpy(pi->data, header, OFP_DEFAULT_MISS_SEND_LEN);
> }
>
> static int make_packet_in(int xid, int buffer_id, char *buf)
> {
> struct ofp_packet_in *pi;
> struct request *req;
> int len;
> pi = (struct ofp_packet_in *)buf;
> pi->header.version = OFP_VERSION;
> pi->header.type = OFPT_PACKET_IN;
> pi->header.xid = htonl(xid);
> req = (struct request *)ring_peek(&to_channel, buffer_id);
> if (req == NULL) {
> fprintf(stderr, "req NULL pointer.\n");
> return 0;
> }
> else {
> pi->in_port = req->in_port;
> pi->buffer_id = htonl(req->buffer_id);
> pi->reason = OFPR_NO_MATCH;
> pi->pad = 0;
> get_header(req, pi);
> }
>
> len = sizeof(*pi) + OFP_DEFAULT_MISS_SEND_LEN;
> pi->header.length = htons(len);
> pi->total_len = htons(len);
> return len;
> }
>
> Whehter the len is not correct?
>
>
>
>
>
>
> At 2014-08-20 04:10:54, "Murphy McCauley" <murphy.mccau...@gmail.com> wrote:
> >It seems like you want to be listening to the PacketIn event, not the
> >ConnectionUp event.
> >
> >-- Murphy
> >
> >On Aug 19, 2014, at 12:35 PM, zhang...@126.com wrote:
> >
> >> Hi all,
> >>
> >> I want to manually set a flow for test. The switch sends a packet_in
> >> message to pox controller.
> >> This is the code:
> >> from pox.core import core
> >> import pox.openflow.libopenflow_01 as of
> >> from pox.lib.revent import *
> >> from pox.lib.addresses import IPAddr, EthAddr
> >> from collections import namedtuple
> >> from pox.lib.util import str_to_bool, dpid_to_str
> >> from pox.lib.packet.ipv4 import ipv4
> >> from pox.lib.packet.ethernet import ethernet
> >> from pox.lib.packet.tcp import *
> >> from pox.lib.packet.udp import *
> >> import os
> >>
> >> log = core.getLogger()
> >>
> >> class Test_output_port (EventMixin):
> >> def __init__ (self):
> >> self.listenTo(core.openflow)
> >>
> >> def _handle_ConnectionUp (self, event):
> >> packet = event.parsed
> >> msg = of.ofp_flow_mod()
> >> msg.match = of.ofp_match.from_packet(packet, event.port);
> >> msg.buffer_id = event.ofp.buffer_id
> >> msg.idle_timeout = 10
> >> msg.idle_timeout = 30
> >> msg.actions.append(of.ofp_action_output(port = 1))
> >> msg.data = event.ofp
> >> event.connection.send(msg),
> >>
> >> def launch ():
> >> '''
> >> Starting the Firewall module
> >> '''
> >> core.registerNew(Test_output_port)
> >>
> >> When test, it shows the following error. If anybody knows the reason, and
> >> can give some help, I will appreciate.
> >> POX 0.2.0 (carp) / Copyright 2011-2013 James McCauley, et al.
> >> DEBUG:core:POX 0.2.0 (carp) going up...
> >> DEBUG:core:Running on CPython (2.7.3/Sep 26 2013 20:03:06)
> >> DEBUG:core:Platform is
> >> Linux-3.2.0-58-generic-x86_64-with-Ubuntu-12.04-precise
> >> INFO:core:POX 0.2.0 (carp) is up.
> >> DEBUG:openflow.of_01:Listening on 0.0.0.0:6633
> >> WARNING:openflow.of_01:<class 'pox.openflow.PacketIn'> raised on dummy
> >> OpenFlow nexus
> >> INFO:openflow.of_01:[00-00-00-00-00-01 1] connected
> >> ERROR:core:Exception while handling OpenFlowNexus!ConnectionUp...
> >> Traceback (most recent call last):
> >> File "/home/guest/controller/pox/pox/lib/revent/revent.py", line 231, in
> >> raiseEventNoErrors
> >> return self.raiseEvent(event, *args, **kw)
> >> File "/home/guest/controller/pox/pox/lib/revent/revent.py", line 278, in
> >> raiseEvent
> >> rv = event._invoke(handler, *args, **kw)
> >> File "/home/guest/controller/pox/pox/lib/revent/revent.py", line 156, in
> >> _invoke
> >> return handler(self, *args, **kw)
> >> File "/home/guest/controller/pox/pox/misc/test_flow_miss.py", line 25, in
> >> _handle_ConnectionUp
> >> packet = event.parsed
> >> AttributeError: 'ConnectionUp' object has no attribute 'parsed'
>
>
