def deploy_flow_entry(self, subnet, outport, dstport):
"""
translate the routing information into flow entry format
and send FlowMod.
"""
if outport is None:
logger.warning('fail to deploy flow entry, cant find output port for %s', str(subnet))
return
# match by destination IP address
match = ofctl_v1_0.to_match(self.dp, {'nw_dst': str(subnet), 'dl_type': '2048', 'nw_proto': '1'})
# rewrite source MAC address with gateway's MAC address
# rewrite destination MAC address with host's MAC address
# set output port
actions = []
actions.append(self.dp.ofproto_parser.OFPActionSetDlSrc(outport.hw_addr.packed))
actions.append(self.dp.ofproto_parser.OFPActionSetDlDst(dstport.hw_addr.packed))
actions.append(self.dp.ofproto_parser.OFPActionOutput(outport.port_no))
mod = self.dp.ofproto_parser.OFPFlowMod(
datapath = self.dp, match = match,
priority = 1, cookie = 0, actions = actions,
idle_timeout = FLOW_IDLE_TIMEOUT,
hard_timeout = FLOW_HARD_TIMEOUT,
command = self.dp.ofproto.OFPFC_MODIFY)
# send FlowMod
self.dp.send_msg(mod)
def remove_ofrule(self, match):
mod = self._ofproto_parser.OFPFlowMod(
datapath=self._dp,
match=to_match(self._dp, match),
cookie=0,
command=self._ofproto.OFPFC_DELETE)
self._dp.send_msg(mod)
def remove_ofrule(self, match):
mod = self._ofproto_parser.OFPFlowMod(
datapath=self._dp,
match=to_match(self._dp, match),
cookie=0,
command=self._ofproto.OFPFC_DELETE)
self._dp.send_msg(mod)
def deliver_to_host(self, msg, pkt, outport_no):
"""
deliver packet to host if the switch owns that subnet.
(1) find ARP entry for destination IP address.
if failed, send ARP request and buffer the packet
(2) create a FlowMod packet.
(3) send FlowMod and PacketOut.
"""
ip_layer = self.find_packet(pkt, 'ipv4')
dp = msg.datapath
switch = self.switches[dp.id]
ipDestAddr = netaddr.IPAddress(ip_layer.dst)
logger.info('final switch arrived, try to deliver to %s (dpid=%s)', str(ipDestAddr), dpid_lib.dpid_to_str(msg.datapath.id))
try:
mac_addr = switch.ip_to_mac[ipDestAddr][0]
except KeyError:
logger.info('no ARP entry for %s, packet buffered', str(ipDestAddr))
self.send_arp_request(msg.datapath, outport_no, ipDestAddr)
switch.msg_buffer.append((msg, pkt, outport_no))
return False
# match by destination IP address
match = ofctl_v1_0.to_match(dp, {'nw_dst': str(ipDestAddr), 'dl_type': '2048', 'nw_proto': '1'})
# rewrite source MAC address with gateway's MAC address
# rewrite destination MAC address with host's MAC address
# set output port
actions = []
actions.append(dp.ofproto_parser.OFPActionSetDlSrc(switch.ports[outport_no].hw_addr.packed))
actions.append(dp.ofproto_parser.OFPActionSetDlDst(mac_addr.packed))
actions.append(dp.ofproto_parser.OFPActionOutput(outport_no))
mod = dp.ofproto_parser.OFPFlowMod(
datapath = dp, match = match,
priority = 1, cookie = 0, actions = actions,
idle_timeout = FLOW_IDLE_TIMEOUT,
hard_timeout = FLOW_HARD_TIMEOUT,
command = dp.ofproto.OFPFC_MODIFY)
out = dp.ofproto_parser.OFPPacketOut(
datapath = dp, buffer_id = msg.buffer_id,
in_port = msg.in_port, actions = actions)
dp.send_msg(mod)
dp.send_msg(out)
logger.info('FlowMod and PacketOut sent, packet delivered to %s', str(ipDestAddr))
return True
def add_ofrule(self, match, actions, priority):
mod = self._ofproto_parser.OFPFlowMod(
datapath=self._dp,
match=to_match(self._dp, match),
cookie=0,
command=self._ofproto.OFPFC_ADD,
idle_timeout=0,
hard_timeout=0,
priority=priority,
flags=self._ofproto.OFPFF_SEND_FLOW_REM,
actions=to_actions(self._dp, actions))
self._dp.send_msg(mod)
def add_ofrule(self, match, actions, priority):
mod = self._ofproto_parser.OFPFlowMod(
datapath=self._dp,
match=to_match(self._dp, match),
cookie=0,
command=self._ofproto.OFPFC_ADD,
idle_timeout=0,
hard_timeout=0,
priority=priority,
flags=self._ofproto.OFPFF_SEND_FLOW_REM,
actions=to_actions(self._dp, actions))
self._dp.send_msg(mod)
def add_ofrule(self, match, actions, priority):
if 'in_port' in match:
for action in actions:
if action['type'] != 'OUTPUT':
continue
if action['port'] == match['in_port']:
action['port'] = ofproto_v1_0.OFPP_IN_PORT
mod = self._ofproto_parser.OFPFlowMod(
datapath=self._dp,
match=to_match(self._dp, match),
cookie=0,
command=self._ofproto.OFPFC_ADD,
idle_timeout=0,
hard_timeout=0,
priority=priority,
flags=self._ofproto.OFPFF_SEND_FLOW_REM,
actions=to_actions(self._dp, actions))
self._dp.send_msg(mod)
def deploy_flow_entry(self, subnet, outport, dstport):
"""
translate the routing information into flow entry format
and send FlowMod.
"""
if outport is None:
logger.warning(
'fail to deploy flow entry, cant find output port for %s',
str(subnet))
return
# match by destination IP address
match = ofctl_v1_0.to_match(self.dp, {
'nw_dst': str(subnet),
'dl_type': '2048',
'nw_proto': '1'
})
# rewrite source MAC address with gateway's MAC address
# rewrite destination MAC address with host's MAC address
# set output port
actions = []
actions.append(
self.dp.ofproto_parser.OFPActionSetDlSrc(outport.hw_addr.packed))
actions.append(
self.dp.ofproto_parser.OFPActionSetDlDst(dstport.hw_addr.packed))
actions.append(self.dp.ofproto_parser.OFPActionOutput(outport.port_no))
mod = self.dp.ofproto_parser.OFPFlowMod(
datapath=self.dp,
match=match,
priority=1,
cookie=0,
actions=actions,
idle_timeout=FLOW_IDLE_TIMEOUT,
hard_timeout=FLOW_HARD_TIMEOUT,
command=self.dp.ofproto.OFPFC_MODIFY)
# send FlowMod
self.dp.send_msg(mod)
def deliver_to_host(self, msg, pkt, outport_no):
"""
deliver packet to host if the switch owns that subnet.
(1) find ARP entry for destination IP address.
if failed, send ARP request and buffer the packet
(2) create a FlowMod packet.
(3) send FlowMod and PacketOut.
"""
ip_layer = self.find_packet(pkt, 'ipv4')
dp = msg.datapath
switch = self.switches[dp.id]
ipDestAddr = netaddr.IPAddress(ip_layer.dst)
logger.info('final switch arrived, try to deliver to %s (dpid=%s)',
str(ipDestAddr), dpid_lib.dpid_to_str(msg.datapath.id))
try:
mac_addr = switch.ip_to_mac[ipDestAddr][0]
except KeyError:
logger.info('no ARP entry for %s, packet buffered',
str(ipDestAddr))
self.send_arp_request(msg.datapath, outport_no, ipDestAddr)
switch.msg_buffer.append((msg, pkt, outport_no))
return False
# match by destination IP address
match = ofctl_v1_0.to_match(dp, {
'nw_dst': str(ipDestAddr),
'dl_type': '2048',
'nw_proto': '1'
})
# rewrite source MAC address with gateway's MAC address
# rewrite destination MAC address with host's MAC address
# set output port
actions = []
actions.append(
dp.ofproto_parser.OFPActionSetDlSrc(
switch.ports[outport_no].hw_addr.packed))
actions.append(dp.ofproto_parser.OFPActionSetDlDst(mac_addr.packed))
actions.append(dp.ofproto_parser.OFPActionOutput(outport_no))
mod = dp.ofproto_parser.OFPFlowMod(datapath=dp,
match=match,
priority=1,
cookie=0,
actions=actions,
idle_timeout=FLOW_IDLE_TIMEOUT,
hard_timeout=FLOW_HARD_TIMEOUT,
command=dp.ofproto.OFPFC_MODIFY)
out = dp.ofproto_parser.OFPPacketOut(datapath=dp,
buffer_id=msg.buffer_id,
in_port=msg.in_port,
actions=actions)
dp.send_msg(mod)
dp.send_msg(out)
logger.info('FlowMod and PacketOut sent, packet delivered to %s',
str(ipDestAddr))
return True
def test_match_to_str(self):
for attrs in self.attrs_list:
match = ofctl_v1_0.to_match(self.dp, attrs)
str = ofctl_v1_0.match_to_str(match)
eq_(attrs, str)