def rcv_packet(self, dp_id, in_port, vlan_vid, pkt):
"""Handle a packet from the dataplane (eg to re/learn a host).
The packet may be sent to us also in response to FAUCET
initiating IPv6 neighbor discovery, or ARP, to resolve
a nexthop.
Args:
dp_id (int): datapath ID.
in_port (int): port packet was received on.
vlan_vid (int): VLAN VID of port packet was received on.
pkt (ryu.lib.packet.packet): packet received.
Return:
list: OpenFlow messages, if any.
"""
if not self._known_up_dpid_and_port(dp_id, in_port):
return []
ofmsgs = []
eth_pkt = valve_packet.parse_pkt(pkt)
eth_src = eth_pkt.src
eth_dst = eth_pkt.dst
vlan = self.dp.vlans[vlan_vid]
port = self.dp.ports[in_port]
if valve_packet.mac_addr_is_unicast(eth_src):
self.logger.debug(
'Packet_in %s src:%s in_port:%d vid:%s',
util.dpid_log(dp_id), eth_src, in_port, vlan_vid)
ofmsgs.extend(self.control_plane_handler(
in_port, vlan, eth_src, eth_dst, pkt))
# ban learning new hosts if max_hosts reached on a VLAN.
if (vlan.max_hosts is not None and
len(vlan.host_cache) == vlan.max_hosts and
eth_src not in vlan.host_cache):
ofmsgs.append(self.host_manager.temp_ban_host_learning_on_vlan(
vlan))
self.logger.info(
'max hosts %u reached on vlan %u, ' +
'temporarily banning learning on this vlan, ' +
'and not learning %s',
vlan.max_hosts, vlan.vid, eth_src)
else:
# TODO: it would be good to be able to notify an external
# system upon re/learning a host.
ofmsgs.extend(self.host_manager.learn_host_on_vlan_port(
port, vlan, eth_src))
self.logger.info(
'learned %u hosts on vlan %u',
len(vlan.host_cache), vlan.vid)
return ofmsgs
def control_plane_handler(self, pkt_meta):
"""Handle a packet probably destined to FAUCET's route managers.
For example, next hop resolution or ICMP echo requests.
Args:
pkt_meta (PacketMeta): packet for control plane.
Returns:
list: OpenFlow messages, if any.
"""
if (pkt_meta.eth_dst == self.FAUCET_MAC or
not valve_packet.mac_addr_is_unicast(pkt_meta.eth_dst)):
for handler in (self.ipv4_route_manager.control_plane_handler,
self.ipv6_route_manager.control_plane_handler):
ofmsgs = handler(pkt_meta)
if ofmsgs:
return ofmsgs
return []
def control_plane_handler(self, pkt_meta):
"""Handle a packet probably destined to FAUCET's route managers.
For example, next hop resolution or ICMP echo requests.
Args:
pkt_meta (PacketMeta): packet for control plane.
Returns:
list: OpenFlow messages, if any.
"""
if (pkt_meta.eth_dst == self.FAUCET_MAC or
not valve_packet.mac_addr_is_unicast(pkt_meta.eth_dst)):
for handler in (self.ipv4_route_manager.control_plane_handler,
self.ipv6_route_manager.control_plane_handler):
ofmsgs = handler(pkt_meta)
if ofmsgs:
return ofmsgs
return []
def rcv_packet(self, dp_id, valves, in_port, vlan_vid, pkt):
"""Handle a packet from the dataplane (eg to re/learn a host).
The packet may be sent to us also in response to FAUCET
initiating IPv6 neighbor discovery, or ARP, to resolve
a nexthop.
Args:
dp_id (int): datapath ID.
valves (dict): all datapaths, indexed by datapath ID.
in_port (int): port packet was received on.
vlan_vid (int): VLAN VID of port packet was received on.
pkt (ryu.lib.packet.packet): packet received.
Return:
list: OpenFlow messages, if any.
"""
if not self._known_up_dpid_and_port(dp_id, in_port):
return []
pkt_meta = self._parse_rcv_packet(in_port, vlan_vid, pkt)
ofmsgs = []
if valve_packet.mac_addr_is_unicast(pkt_meta.eth_src):
self.logger.debug(
'Packet_in %s src:%s in_port:%d vid:%s',
util.dpid_log(dp_id),
pkt_meta.eth_src,
pkt_meta.port.number,
pkt_meta.vlan.vid)
ofmsgs.extend(self.control_plane_handler(pkt_meta))
if self._rate_limit_packet_ins():
return ofmsgs
ban_vlan_rules = self._vlan_learn_ban_rules(pkt_meta)
if ban_vlan_rules:
ofmsgs.extend(ban_vlan_rules)
return ofmsgs
ofmsgs.extend(self._learn_host(valves, dp_id, pkt_meta))
return ofmsgs
def rcv_packet(self, dp_id, valves, in_port, vlan_vid, pkt):
"""Handle a packet from the dataplane (eg to re/learn a host).
The packet may be sent to us also in response to FAUCET
initiating IPv6 neighbor discovery, or ARP, to resolve
a nexthop.
Args:
dp_id (int): datapath ID.
valves (dict): all datapaths, indexed by datapath ID.
in_port (int): port packet was received on.
vlan_vid (int): VLAN VID of port packet was received on.
pkt (ryu.lib.packet.packet): packet received.
Return:
list: OpenFlow messages, if any.
"""
if not self._known_up_dpid_and_port(dp_id, in_port):
return []
pkt_meta = self._parse_rcv_packet(in_port, vlan_vid, pkt)
ofmsgs = []
if valve_packet.mac_addr_is_unicast(pkt_meta.eth_src):
self.logger.debug(
'Packet_in %s src:%s in_port:%d vid:%s',
util.dpid_log(dp_id),
pkt_meta.eth_src,
pkt_meta.port.number,
pkt_meta.vlan.vid)
ofmsgs.extend(self.control_plane_handler(pkt_meta))
if self._rate_limit_packet_ins():
return ofmsgs
ban_vlan_rules = self._vlan_learn_ban_rules(pkt_meta)
if ban_vlan_rules:
ofmsgs.extend(ban_vlan_rules)
return ofmsgs
ofmsgs.extend(self._learn_host(valves, dp_id, pkt_meta))
return ofmsgs
def control_plane_handler(self, in_port, vlan, eth_src, eth_dst, pkt):
"""Handle a packet probably destined to FAUCET's route managers.
For example, next hop resolution or ICMP echo requests.
Args:
in_port (int): port the packet was received on.
vlan (vlan): vlan of the port the packet was received on.
eth_src (str): source Ethernet MAC address.
eth_dst (str): destination Ethernet MAC address.
pkt (ryu.lib.packet.ethernet): packet received.
Returns:
list: OpenFlow messages, if any.
"""
if eth_dst == self.FAUCET_MAC or not valve_packet.mac_addr_is_unicast(eth_dst):
for handler in (self.ipv4_route_manager.control_plane_handler,
self.ipv6_route_manager.control_plane_handler):
ofmsgs = handler(in_port, vlan, eth_src, eth_dst, pkt)
if ofmsgs:
return ofmsgs
return []
def control_plane_handler(self, in_port, vlan, eth_src, eth_dst, pkt):
"""Handle a packet probably destined to FAUCET's route managers.
For example, next hop resolution or ICMP echo requests.
Args:
in_port (int): port the packet was received on.
vlan (vlan): vlan of the port the packet was received on.
eth_src (str): source Ethernet MAC address.
eth_dst (str): destination Ethernet MAC address.
pkt (ryu.lib.packet.ethernet): packet received.
Returns:
list: OpenFlow messages, if any.
"""
if eth_dst == self.FAUCET_MAC or not valve_packet.mac_addr_is_unicast(eth_dst):
for handler in (self.ipv4_route_manager.control_plane_handler,
self.ipv6_route_manager.control_plane_handler):
ofmsgs = handler(in_port, vlan, eth_src, eth_dst, pkt)
if ofmsgs:
return ofmsgs
return []
def rcv_packet(self, dp_id, valves, in_port, vlan_vid, pkt):
"""Handle a packet from the dataplane (eg to re/learn a host).
The packet may be sent to us also in response to FAUCET
initiating IPv6 neighbor discovery, or ARP, to resolve
a nexthop.
Args:
dp_id (int): datapath ID.
valves (dict): all datapaths, indexed by datapath ID.
in_port (int): port packet was received on.
vlan_vid (int): VLAN VID of port packet was received on.
pkt (ryu.lib.packet.packet): packet received.
Return:
list: OpenFlow messages, if any.
"""
if not self._known_up_dpid_and_port(dp_id, in_port):
return []
ofmsgs = []
eth_pkt = valve_packet.parse_pkt(pkt)
eth_src = eth_pkt.src
eth_dst = eth_pkt.dst
vlan = self.dp.vlans[vlan_vid]
port = self.dp.ports[in_port]
if valve_packet.mac_addr_is_unicast(eth_src):
self.logger.debug(
'Packet_in %s src:%s in_port:%d vid:%s',
util.dpid_log(dp_id), eth_src, in_port, vlan_vid)
ofmsgs.extend(self.control_plane_handler(
in_port, vlan, eth_src, eth_dst, pkt))
# Apply learning packet in rate limit.
if self.dp.ignore_learn_ins:
if int(time.time() * 1e3) % self.dp.ignore_learn_ins == 0:
return ofmsgs
# ban learning new hosts if max_hosts reached on a VLAN.
if (vlan.max_hosts is not None and
len(vlan.host_cache) == vlan.max_hosts and
eth_src not in vlan.host_cache):
ofmsgs.append(self.host_manager.temp_ban_host_learning_on_vlan(
vlan))
self.logger.info(
'max hosts %u reached on vlan %u, ' +
'temporarily banning learning on this vlan, ' +
'and not learning %s',
vlan.max_hosts, vlan.vid, eth_src)
else:
if port.stack is None:
learn_port = port
else:
# TODO: simplest possible unicast learning.
# We find just one port that is the shortest unicast path to
# the destination. We could use other factors (eg we could
# load balance over multiple ports based on destination MAC).
# TODO: each DP learns independently. An edge DP could
# call other valves so they learn immediately without waiting
# for packet in.
# TODO: edge DPs could use a different forwarding algorithm
# (for example, just default switch to a neighbor).
host_learned_other_dp = None
# Find port that forwards closer to destination DP that
# has already learned this host (if any).
for other_dpid, other_valve in valves.iteritems():
if other_dpid == dp_id:
continue
other_dp = other_valve.dp
other_dp_host_cache = other_dp.vlans[vlan_vid].host_cache
if eth_src in other_dp_host_cache:
host = other_dp_host_cache[eth_src]
if host.edge:
host_learned_other_dp = other_dp
break
# No edge DP may have learned this host yet.
if host_learned_other_dp is None:
return ofmsgs
learn_port = self.dp.shortest_path_port(
host_learned_other_dp.name)
self.logger.info(
'host learned via stack port to %s',
host_learned_other_dp.name)
# TODO: it would be good to be able to notify an external
# system upon re/learning a host.
ofmsgs.extend(self.host_manager.learn_host_on_vlan_port(
learn_port, vlan, eth_src))
self.logger.info(
'learned %u hosts on vlan %u',
len(vlan.host_cache), vlan.vid)
return ofmsgs
