def _init_switches(self):
self.dpids = getStats.get_dpids()
for dpid in self.dpids:
vid = Vid(sw=dpid, host=0x00)
switch = Switch(dpid=dpid, vid=vid)
if dpid == self.DPID:
self.switch = switch
self.topo.addSwitch(switch)
# table 0
# handle arp request
if Switch.is_edge_switch(dpid):
postFlows.add_arp_request_flow(dpid, Vid.vid2mac(0x20, 0x00))
postFlows.add_arp_dir_transfer_flow(dpid,
Vid.vid2mac(0x20, 0x00))
# disable lldp
postFlows.add_lldp_disable_flow(dpid)
# rule for packet from hosts
postFlows.add_host_packet_modify_flow(dpid)
# set go to table 2
postFlows.add_resubmit_flow(dpid, table_id=0, goto_id=2)
def _handle_host_register(self, datapath, in_port, src_mac, src_ip, dst_ip):
# proxy is registering
# src_mac should be the hwaddr of host
host = self.server.get_host(src_mac)
if host:
# host is registering its first vid
self.logger.info('Vid register request received from %s', host.local_mac)
self.server.register_host(host)
self.server.add_host_receiving_entry(host)
src_mac = host.fake_mac
dst_mac = Vid.vid2mac(host.switch.vid.sw, host.vid.host)
self._send_arp_reply(datapath, in_port, src_mac, dst_mac, src_ip, dst_ip)
self.logger.info('Answer host register with vid %s', src_mac)
def _handle_arp(self, datapath, in_port, src_mac, src_ip, dst_ip):
self.logger.info("Handling ARP...")
# arp askee
dst_host = self.server.find_host_by_ip(dst_ip)
self.logger.info("ARP askee is: %s", str(dst_host))
# arp asker
src_host = self.server.find_host_by_fake_mac(src_mac)
self.logger.info("ARP asker is: %s", str(src_host))
if dst_host and src_host:
if self.server.add_host_forwarding_entry(src_host.switch.dpid, dst_host):
self.logger.info("Adding new host forwarding entry to %s, host.fake_mac == %s", src_host.dpid, dst_host.fake_mac)
dst_mac = dst_host.fake_mac
src_mac = Vid.vid2mac(src_host.switch.vid.sw, src_host.vid.host)
self.logger.info('PacketIn: ARP, %s is asking for %s', src_ip, dst_ip)
self._send_arp_reply(datapath, in_port, dst_mac, src_mac, dst_ip, src_ip)
self.logger.info('Answer ARP for %s with MAC address %s', dst_ip, dst_mac)
def answer_host_vid_update_request(self, host):
affected_dpids = []
new_host_vid = Vid.get_next_host_vid()
self.del_host_receiving_flow(host.dpid, host.vid, host.port)
self.del_host_forwarding_flow(host.dpid, host.vid, host.switch.vid)
for switch in self.topo.switches.itervalues():
affected = False
for h in switch.host_forwarding_table:
if h.vid == host.vid:
affected = True
affected_dpids.append(switch.dpid)
h.vid = new_host_vid
if affected:
self.del_host_forwarding_flow(switch.dpid, host.vid,
host.switch.vid)
self.add_host_forwarding_flow(switch.dpid, new_host_vid,
host.switch.vid)
host.update_vid(new_host_vid)
host.set_fake_mac(Vid.vid2mac(host.vid.sw, host.vid.host))
self.add_host_receiving_entry(host)
return affected_dpids
def register_host(self, host):
host.update_vid(Vid.get_next_host_vid())
host.set_fake_mac(Vid.vid2mac(host.vid.sw, host.vid.host))
self.topo.switches[host.dpid].addHost(host)
def add_arp_dir_transfer_flow(self, dpid):
postFlows.add_arp_dir_transfer_flow(
dpid, Vid.vid2mac(self.switch.vid.sw, self.vid.host))
def mod_arp_request_flow(self, dpid):
postFlows.mod_arp_request_flow(
dpid, Vid.vid2mac(self.switch.vid.sw, self.vid.host))