def learn(self, event):
"""
Intercept and inspect ARP messages.
"""
pkt = event.parse()
if pkt.type != 2054: return
arp = pkt.next
host_a = core.db.find_host({"mac": str(arp.hwsrc)})
h = {
"_parent": str(event.dpid),
"port_no": str(event.port),
"ip": str(arp.protosrc),
"mac": str(arp.hwsrc),
"group_no": "-1",
"active": True
}
# Is the DB out of sync
if host_a is None:
print("Host %s is new. Recording and adding to null group" %
str(arp.hwsrc))
self.hosts[str(arp.hwsrc)] = h
core.db.update_host(h)
return
# Is Local out of sync
if not str(arp.hwsrc) in self.hosts:
print("Host %s is new to local db. Syncing with remote db." %
str(arp.hwsrc))
h["group_no"] = host_a["group_no"]
self.hosts[str(arp.hwsrc)] = h
core.db.update_host(h)
e = Event()
e.host = host_a
self.handle_event("host-update", e)
# Is Local out of sync
h["group_no"] = host_a["group_no"]
if host_a["ip"] != h["ip"] or host_a["port_no"] != h["port_no"] \
or host_a["_parent"] != h["_parent"] or host_a["active"] != h["active"]:
print("Saving host %s changes to db and installing new flows." %
str(arp.hwsrc))
self.hosts[str(arp.hwsrc)] = h
core.db.update_host(h)
e = Event()
e.host = host_a
self.handle_event("host-update", e)
if host_a["group_no"] is "-1":
print("Not broadcasting ARP from Host %s" % str(arp.hwsrc))
return
else:
host_b = core.db.find_host({"ip": str(arp.protodst)})
if host_b is None or host_b["group_no"] is -1: return
self.send_arp(host_a, host_b)
def learn(self, event):
"""
Intercept and inspect ARP messages.
"""
pkt = event.parse()
if pkt.type != 2054: return
arp = pkt.next
host_a = core.db.find_host({"mac": str(arp.hwsrc)})
h = {"_parent": str(event.dpid),
"port_no": str(event.port),
"ip": str(arp.protosrc),
"mac": str(arp.hwsrc),
"group_no": "-1", "active": True}
# Is the DB out of sync
if host_a is None:
print("Host %s is new. Recording and adding to null group" % str(arp.hwsrc))
self.hosts[str(arp.hwsrc)] = h
core.db.update_host(h)
return
# Is Local out of sync
if not str(arp.hwsrc) in self.hosts:
print("Host %s is new to local db. Syncing with remote db." % str(arp.hwsrc))
h["group_no"] = host_a["group_no"]
self.hosts[str(arp.hwsrc)] = h
core.db.update_host(h)
e = Event()
e.host = host_a
self.handle_event("host-update", e)
# Is Local out of sync
h["group_no"] = host_a["group_no"]
if host_a["ip"] != h["ip"] or host_a["port_no"] != h["port_no"] \
or host_a["_parent"] != h["_parent"] or host_a["active"] != h["active"]:
print("Saving host %s changes to db and installing new flows." % str(arp.hwsrc))
self.hosts[str(arp.hwsrc)] = h
core.db.update_host(h)
e = Event()
e.host = host_a
self.handle_event("host-update", e)
if host_a["group_no"] is "-1":
print("Not broadcasting ARP from Host %s" % str(arp.hwsrc))
return
else:
host_b = core.db.find_host({"ip": str(arp.protodst)})
if host_b is None or host_b["group_no"] is -1: return
self.send_arp(host_a, host_b)
