def _link_down(self, port):
try:
dst, rev_link_dst = self.links.port_deleted(port)
except KeyError:
# LOG.debug('key error. src=%s, dst=%s',
# port, self.links.get_peer(port))
return
link = Link(port, dst)
self.send_event_to_observers(event.EventLinkDelete(link))
if rev_link_dst:
rev_link = Link(dst, rev_link_dst)
self.send_event_to_observers(event.EventLinkDelete(rev_link))
self.ports.move_front(dst)
def link_loop(self):
while self.is_active:
self.link_event.clear()
now = time.time()
deleted = []
for (link, timestamp) in self.links.items():
# LOG.debug('%s timestamp %d (now %d)', link, timestamp, now)
if timestamp + self.LINK_TIMEOUT < now:
deleted.append(link)
for link in deleted:
self.links.link_down(link)
# LOG.debug('delete %s', link)
self.send_event_to_observers(event.EventLinkDelete(link))
dst = link.dst
rev_link = Link(dst, link.src)
if rev_link not in deleted:
# It is very likely that the reverse link is also
# disconnected. Check it early.
expire = now - self.LINK_TIMEOUT
self.links.rev_link_set_timestamp(rev_link, expire)
if dst in self.ports:
self.ports.move_front(dst)
self.lldp_event.set()
self.link_event.wait(timeout=self.TIMEOUT_CHECK_PERIOD)
def lldp_packet_in_handler(self, ev):
if not self.link_discovery:
return
msg = ev.msg
try:
src_dpid, src_port_no = LLDPPacket.lldp_parse(msg.data)
except LLDPPacket.LLDPUnknownFormat:
# This handler can receive all the packets which can be
# not-LLDP packet. Ignore it silently
return
dst_dpid = msg.datapath.id
if msg.datapath.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
dst_port_no = msg.in_port
elif msg.datapath.ofproto.OFP_VERSION >= ofproto_v1_2.OFP_VERSION:
dst_port_no = msg.match['in_port']
else:
LOG.error('cannot accept LLDP. unsupported version. %x',
msg.datapath.ofproto.OFP_VERSION)
src = self._get_port(src_dpid, src_port_no)
if not src or src.dpid == dst_dpid:
return
try:
self.ports.lldp_received(src)
except KeyError:
# There are races between EventOFPPacketIn and
# EventDPPortAdd. So packet-in event can happend before
# port add event. In that case key error can happend.
# LOG.debug('lldp_received error', exc_info=True)
pass
dst = self._get_port(dst_dpid, dst_port_no)
if not dst:
return
old_peer = self.links.get_peer(src)
# LOG.debug("Packet-In")
# LOG.debug(" src=%s", src)
# LOG.debug(" dst=%s", dst)
# LOG.debug(" old_peer=%s", old_peer)
if old_peer and old_peer != dst:
old_link = Link(src, old_peer)
del self.links[old_link]
self.send_event_to_observers(event.EventLinkDelete(old_link))
link = Link(src, dst)
if link not in self.links:
self.send_event_to_observers(event.EventLinkAdd(link))
# remove hosts if it's not attached to edge port
host_to_del = []
for host in self.hosts.values():
if not self._is_edge_port(host.port):
host_to_del.append(host.mac)
for host_mac in host_to_del:
del self.hosts[host_mac]
if not self.links.update_link(src, dst):
# reverse link is not detected yet.
# So schedule the check early because it's very likely it's up
self.ports.move_front(dst)
self.lldp_event.set()
if self.explicit_drop:
self._drop_packet(msg)