Hi Every One,
I am trying to write an application that does topology discovery.
I added the a function def get_topology_data at the end of my application
I ran the controller with the command: "ryu-manager ryu.app.myswitch
--observe-links" and then the mininet with my custom. However, the event
EventSwitchEnter is never triggered. Can you please let me know if i am
missing something here?
My code is as follows:
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_3
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet
from ryu.lib.packet import ether_types
from ryu import utils
from ryu.lib.packet import ipv6
from ryu.lib import mac
from ryu.topology import event,switches
from ryu.topology.api import get_switch, get_link
import copy
class SimpleSwitch13(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(SimpleSwitch13, self).__init__(*args, **kwargs)
self.mac_to_port = {}
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def switch_features_handler(self, ev):
datapath = ev.msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
msg=ev.msg
#self.logger.info("Packet data: {}".format(msg))
# install table-miss flow entry
#
# We specify NO BUFFER to max_len of the output action due to
# OVS bug. At this moment, if we specify a lesser number, e.g.,
# 128, OVS will send Packet-In with invalid buffer_id and
# truncated packet data. In that case, we cannot output packets
# correctly. The bug has been fixed in OVS v2.1.0.
match = parser.OFPMatch()
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
ofproto.OFPCML_NO_BUFFER)]
self.add_flow(datapath, 0, match, actions)
#self.logger.info("Switch: {}".format(datapath.id))
def add_flow(self, datapath, priority, match, actions, buffer_id=None):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions)]
if buffer_id:
mod = parser.OFPFlowMod(datapath=datapath, buffer_id=buffer_id,
priority=priority, match=match,
instructions=inst)
else:
mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
match=match, instructions=inst)
datapath.send_msg(mod)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
# If you hit this you might want to increase
# the "miss_send_length" of your switch
if ev.msg.msg_len < ev.msg.total_len:
self.logger.debug("packet truncated: only %s of %s bytes",
ev.msg.msg_len, ev.msg.total_len)
msg = ev.msg
datapath = msg.datapath
#self.logger.info('Datapath: {}'.format(datapath.id))
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
#self.logger.info('Parser: {}'.format(parser))
if msg.reason == ofproto.OFPR_NO_MATCH:
reason = 'NO MATCH'
elif msg.reason == ofproto.OFPR_ACTION:
reason = 'ACTION'
elif msg.reason == ofproto.OFPR_INVALID_TTL:
reason = 'INVALID TTL'
#self.logger.info('OFPPacketIn received: buffer_id=%x total_len=%d
reason=%s table_id=%d cookie=%d match=%s', msg.buffer_id, msg.total_len,
reason, msg.table_id, msg.cookie, msg.match)
in_port = msg.match['in_port']
#open flow headers are parsed already
pkt = packet.Packet(msg.data)
#self.logger.info('Packet information {}'.format(pkt))
eth = pkt.get_protocols(ethernet.ethernet)[0]
dst = eth.dst
src = eth.src
dpid = datapath.id
if eth.ethertype == ether_types.ETH_TYPE_LLDP: # ignore lldp packet
#self.logger.info("LLDP packet in %s %s %s %s", dpid, src, dst,
in_port)
return
self.mac_to_port.setdefault(dpid, {})
self.logger.info("packet in %s %s %s %s", dpid, src, dst, in_port)
if dst[:5] == "33:33": # ignore IPV6 multicast packet
match = parser.OFPMatch(in_port=in_port,eth_dst=dst)
actions=[]
self.add_flow(datapath, 1 , match, actions)
return
if dst==mac.BROADCAST_STR: # Handle ARP broadcast
self.logger.info('This is ARP broadcast received at port {} of
switch {}'.format(in_port, datapath.id) )
#self.send_arpproxy()
# This event is not triggered at all.
@set_ev_cls(event.EventSwitchEnter)
def get_topology_data(self, ev):
# The Function get_switch(self, None) outputs the list of switches.
self.topo_raw_switches = copy.copy(get_switch(self, None))
# The Function get_link(self, None) outputs the list of links.
self.topo_raw_links = copy.copy(get_link(self, None))
self.logger.info("****************THIS EVENT IS NOT
TRIGGERRED***********")
print(" \t" + "Current Links:")
for l in self.topo_raw_links:
print (" \t\t" + str(l))
print(" \t" + "Current Switches:")
for s in self.topo_raw_switches:
print (" \t\t" + str(s))
return
Thank you,
Taha
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Ryu-devel mailing list
Ryu-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/ryu-devel
