def install_routing_path(self, path, msg):
""" Set the flow tables for the new routing path and
forward the message
"""
if path != None:
pck = packet.Packet(msg.data)
eth = pck.get_protocol(ethernet.ethernet)
src = eth.src
dst = eth.dst
# build match from msg
match = CustomOFPMatch.build_from_msg(msg)
print "DEBUG: build match from msg:/n", match
# exclude in the loop the last node in the path because it is an host
for i in range( len(path)-2, -1, -1 ):
node = path[i]
out_port = self.get_next_out_port(path, node)
datapath = self.dp_ref_dict.get(node)
actions = [parser13.OFPActionOutput(out_port)]
of_func.ofAddFlow(datapath = datapath, match = match,
actions = actions, idle_timeout = self.IDLE_TIME_OUT, buffer_id = msg.buffer_id)
def _init_switch_oftable(self, datapath):
# drop arp requests to avoid arp storm
match_arp_req = parser13.OFPMatch(eth_type = ETH_TYPE_ARP, arp_op = ARP_REQUEST)
actions_arp_req = []
of_tb_func.ofAddFlow(datapath, match_arp_req, actions_arp_req)
# forward arp replies to the controller
match_arp_rep = parser13.OFPMatch(eth_type = ETH_TYPE_ARP, arp_op = ARP_REPLY)
actions_arp_rep = [parser13.OFPActionOutput(ofproto13.OFPP_CONTROLLER, ofproto13.OFPCML_NO_BUFFER)]
of_tb_func.ofAddFlow(datapath, match_arp_rep, actions_arp_rep)
def _init_switch_oftable(self, ev):
datapath = ev.msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
# install table-miss flow entry
# NO BUFFER option set
match = parser.OFPMatch()
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
ofproto.OFPCML_NO_BUFFER)]
of_func.ofAddFlow(datapath, match, actions, priority = 0)
def setup_flowtable(self, ev):
datapath = ev.msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
# install table-miss flow entry
# NO BUFFER option set
match = parser.OFPMatch()
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER)] #TODO set buffer on the switched
priority = TABLE_MISS_PRIORITY
of_func.ofAddFlow(datapath, match, actions, priority)
def broadcast_arp(self):
switch_list = get_switch(self, None)
# modify flows to drop temporarily arp request
match = parser13.OFPMatch(eth_dst = BROADCAST_STR, eth_type = ETH_TYPE_ARP)
actions = []
for switch in switch_list:
of_func.ofAddFlow(switch.dp, match, actions, self.ARP_BROADCAST_PRIORITY)
for switch in switch_list:
of_func.ofPckOut(self.current_msg, ofproto13.OFPP_FLOOD)
# del flows to drop arp request
for switch in switch_list:
of_func.ofDelFlow(switch.dp, match, self.ARP_BROADCAST_PRIORITY)