def _control_plane_arp_handler(self, pkt_meta):
ofmsgs = []
pkt_meta.reparse_ip(ether.ETH_TYPE_ARP)
arp_pkt = pkt_meta.pkt.get_protocol(arp.arp)
if arp_pkt is None:
return ofmsgs
src_ip = ipaddress.IPv4Address(btos(arp_pkt.src_ip))
dst_ip = ipaddress.IPv4Address(btos(arp_pkt.dst_ip))
vlan = pkt_meta.vlan
if vlan.from_connected_to_vip(src_ip, dst_ip):
opcode = arp_pkt.opcode
port = pkt_meta.port
eth_src = pkt_meta.eth_src
vid = self._vlan_vid(vlan, port)
if opcode == arp.ARP_REQUEST:
ofmsgs.extend(
self._add_host_fib_route(vlan, src_ip))
ofmsgs.extend(self._update_nexthop(
vlan, port, eth_src, src_ip))
arp_reply = valve_packet.arp_reply(
vid, vlan.faucet_mac, eth_src, dst_ip, src_ip)
ofmsgs.append(
valve_of.packetout(port.number, arp_reply.data))
self.logger.info(
'Responded to ARP request for %s from %s (%s) on VLAN %u' % (
dst_ip, src_ip, eth_src, vlan.vid))
elif (opcode == arp.ARP_REPLY and
pkt_meta.eth_dst == vlan.faucet_mac):
ofmsgs.extend(
self._update_nexthop(vlan, port, eth_src, src_ip))
self.logger.info(
'ARP response %s (%s) on VLAN %u' % (
src_ip, eth_src, vlan.vid))
return ofmsgs
def __init__(self, _id, dp_id, conf=None):
super(VLAN, self).__init__(_id, conf)
self.dp_id = dp_id
self.tagged = []
self.untagged = []
self.dyn_host_cache = {}
self.dyn_faucet_vips_by_ipv = collections.defaultdict(list)
self.dyn_routes_by_ipv = collections.defaultdict(dict)
self.dyn_neigh_cache_by_ipv = collections.defaultdict(dict)
self.dyn_ipvs = []
if self.faucet_vips:
self.faucet_vips = [
ipaddress.ip_interface(btos(ip)) for ip in self.faucet_vips
]
for faucet_vip in self.faucet_vips:
self.dyn_faucet_vips_by_ipv[faucet_vip.version].append(
faucet_vip)
self.dyn_ipvs = list(self.dyn_faucet_vips_by_ipv.keys())
if self.bgp_as:
assert self.bgp_port
assert ipaddress.IPv4Address(btos(self.bgp_routerid))
for neighbor_ip in self.bgp_neighbor_addresses:
assert ipaddress.ip_address(btos(neighbor_ip))
assert self.bgp_neighbor_as
if self.routes:
self.routes = [route['route'] for route in self.routes]
for route in self.routes:
ip_gw = ipaddress.ip_address(btos(route['ip_gw']))
ip_dst = ipaddress.ip_network(btos(route['ip_dst']))
assert ip_gw.version == ip_dst.version
self.dyn_routes_by_ipv[ip_gw.version][ip_dst] = ip_gw
def _bgp_route_handler(self, path_change, vlan):
"""Handle a BGP change event.
Args:
path_change (ryu.services.protocols.bgp.bgpspeaker.EventPrefix): path change
vlan (vlan): Valve VLAN this path change was received for.
"""
prefix = ipaddress.ip_network(btos(path_change.prefix))
nexthop = ipaddress.ip_address(btos(path_change.nexthop))
withdraw = path_change.is_withdraw
flowmods = []
valve = self._valves[vlan.dp_id]
if vlan.is_faucet_vip(nexthop):
self.logger.error('BGP nexthop %s for prefix %s cannot be us',
nexthop, prefix)
return
if vlan.ip_in_vip_subnet(nexthop) is None:
self.logger.error(
'BGP nexthop %s for prefix %s is not a connected network',
nexthop, prefix)
return
if withdraw:
self.logger.info('BGP withdraw %s nexthop %s', prefix, nexthop)
flowmods = valve.del_route(vlan, prefix)
else:
self.logger.info('BGP add %s nexthop %s', prefix, nexthop)
flowmods = valve.add_route(vlan, nexthop, prefix)
if flowmods:
self._send_flow_msgs(vlan.dp_id, flowmods)
def _control_plane_arp_handler(self, pkt_meta, arp_pkt):
src_ip = ipaddress.IPv4Address(btos(arp_pkt.src_ip))
dst_ip = ipaddress.IPv4Address(btos(arp_pkt.dst_ip))
vlan = pkt_meta.vlan
opcode = arp_pkt.opcode
ofmsgs = []
if vlan.from_connected_to_vip(src_ip, dst_ip):
port = pkt_meta.port
eth_src = pkt_meta.eth_src
if opcode == arp.ARP_REQUEST:
ofmsgs.extend(self._add_host_fib_route(vlan, src_ip))
ofmsgs.extend(self._update_nexthop(vlan, port, eth_src,
src_ip))
vid = self._vlan_vid(vlan, port)
arp_reply = valve_packet.arp_reply(vid, self.faucet_mac,
eth_src, dst_ip, src_ip)
ofmsgs.append(valve_of.packetout(port.number, arp_reply.data))
self.logger.info(
'Responded to ARP request for %s from %s (%s)', dst_ip,
src_ip, eth_src)
elif (opcode == arp.ARP_REPLY
and pkt_meta.eth_dst == self.faucet_mac):
ofmsgs.extend(self._update_nexthop(vlan, port, eth_src,
src_ip))
self.logger.info('ARP response %s (%s)', src_ip, eth_src)
return ofmsgs
def _control_plane_icmpv6_handler(self, pkt_meta, ipv6_pkt, icmpv6_pkt):
vlan = pkt_meta.vlan
src_ip = ipaddress.IPv6Address(btos(ipv6_pkt.src))
dst_ip = ipaddress.IPv6Address(btos(ipv6_pkt.dst))
icmpv6_type = icmpv6_pkt.type_
ofmsgs = []
if vlan.ip_in_vip_subnet(src_ip):
in_port = pkt_meta.port.number
vid = self._vlan_vid(vlan, in_port)
eth_src = pkt_meta.eth_src
if icmpv6_type == icmpv6.ND_NEIGHBOR_SOLICIT:
solicited_ip = btos(icmpv6_pkt.data.dst)
if vlan.is_faucet_vip(ipaddress.ip_address(solicited_ip)):
ofmsgs.extend(self._add_host_fib_route(vlan, src_ip))
nd_reply = valve_packet.nd_reply(self.faucet_mac, eth_src,
vid, solicited_ip, src_ip,
ipv6_pkt.hop_limit)
ofmsgs.append(valve_of.packetout(in_port, nd_reply.data))
self.logger.info(
'Responded to ND solicit for %s to %s (%s)',
solicited_ip, src_ip, eth_src)
elif icmpv6_type == icmpv6.ND_NEIGHBOR_ADVERT:
ofmsgs.extend(
self._update_nexthop(vlan, in_port, eth_src, src_ip))
self.logger.info('ND advert %s (%s)', src_ip, eth_src)
elif vlan.from_connected_to_vip(src_ip, dst_ip):
if (icmpv6_type == icmpv6.ICMPV6_ECHO_REQUEST
and pkt_meta.eth_dst == self.faucet_mac):
icmpv6_echo_reply = valve_packet.icmpv6_echo_reply(
self.faucet_mac, eth_src, vid, dst_ip, src_ip,
ipv6_pkt.hop_limit, icmpv6_pkt.data.id,
icmpv6_pkt.data.seq, icmpv6_pkt.data.data)
ofmsgs.append(
valve_of.packetout(in_port, icmpv6_echo_reply.data))
return ofmsgs
def _control_plane_icmp_handler(self, pkt_meta, ipv4_pkt, icmp_pkt):
src_ip = ipaddress.IPv4Address(btos(ipv4_pkt.src))
dst_ip = ipaddress.IPv4Address(btos(ipv4_pkt.dst))
vlan = pkt_meta.vlan
icmpv4_type = icmp_pkt.type
ofmsgs = []
if vlan.from_connected_to_vip(src_ip, dst_ip):
if (icmpv4_type == icmp.ICMP_ECHO_REQUEST
and pkt_meta.eth_dst == self.faucet_mac):
port = pkt_meta.port
vid = self._vlan_vid(vlan, port)
echo_reply = valve_packet.echo_reply(vid, self.faucet_mac,
pkt_meta.eth_src, dst_ip,
src_ip, icmp_pkt.data)
ofmsgs.append(valve_of.packetout(port.number, echo_reply.data))
return ofmsgs
def add_host_fib_route_from_pkt(self, pkt_meta):
"""Add a host FIB route given packet from host.
Args:
pkt_meta (PacketMeta): received packet.
Returns:
list: OpenFlow messages.
"""
ip_pkt = self._ip_pkt(pkt_meta.pkt)
ofmsgs = []
if ip_pkt:
src_ip = ipaddress.ip_address(btos(ip_pkt.src))
if src_ip and pkt_meta.vlan.ip_in_vip_subnet(src_ip):
now = time.time()
nexthop_fresh = self._nexthop_fresh(pkt_meta.vlan, src_ip, now)
self._update_nexthop_cache(pkt_meta.vlan, pkt_meta.eth_src,
src_ip)
if not nexthop_fresh:
if self.use_group_table:
ofmsgs.extend(
self._update_nexthop_group(False, src_ip,
pkt_meta.vlan,
pkt_meta.port,
pkt_meta.eth_src))
ofmsgs.extend(
self._add_host_fib_route(pkt_meta.vlan, src_ip))
return ofmsgs
def control_plane_handler(self, pkt_meta):
pkt = pkt_meta.pkt
ipv6_pkt = pkt.get_protocol(ipv6.ipv6)
if ipv6_pkt is not None:
icmp_replies = self._control_plane_icmpv6_handler(
pkt_meta, ipv6_pkt)
if icmp_replies:
return icmp_replies
dst_ip = ipaddress.IPv6Address(btos(ipv6_pkt.dst))
return self._proactive_resolve_neighbor([pkt_meta.vlan], dst_ip)
return []
def control_plane_handler(self, pkt_meta):
ipv4_pkt = pkt_meta.pkt.get_protocol(ipv4.ipv4)
if ipv4_pkt is None:
return self._control_plane_arp_handler(pkt_meta)
else:
icmp_replies = self._control_plane_icmp_handler(pkt_meta, ipv4_pkt)
if icmp_replies:
return icmp_replies
dst_ip = ipaddress.IPv4Address(btos(ipv4_pkt.dst))
vlan = pkt_meta.vlan
return self._proactive_resolve_neighbor([vlan], dst_ip)
return []
def _control_plane_icmp_handler(self, pkt_meta, ipv4_pkt):
ofmsgs = []
src_ip = ipaddress.IPv4Address(btos(ipv4_pkt.src))
dst_ip = ipaddress.IPv4Address(btos(ipv4_pkt.dst))
vlan = pkt_meta.vlan
if vlan.from_connected_to_vip(src_ip, dst_ip):
if pkt_meta.eth_dst != vlan.faucet_mac:
return ofmsgs
if ipv4_pkt.proto != inet.IPPROTO_ICMP:
return ofmsgs
pkt_meta.reparse_all()
icmp_pkt = pkt_meta.pkt.get_protocol(icmp.icmp)
if icmp_pkt is None:
return ofmsgs
if icmp_pkt.type == icmp.ICMP_ECHO_REQUEST:
port = pkt_meta.port
vid = self._vlan_vid(vlan, port)
echo_reply = valve_packet.echo_reply(vid, vlan.faucet_mac,
pkt_meta.eth_src, dst_ip,
src_ip, icmp_pkt.data)
ofmsgs.append(valve_of.packetout(port.number, echo_reply.data))
return ofmsgs
def __init__(self, _id, dp_id, conf=None):
if conf is None:
conf = {}
self._id = _id
self.dp_id = dp_id
valve_util.check_unknown_conf(conf, self.defaults)
self.update(conf)
self.set_defaults()
self._id = _id
self.tagged = []
self.untagged = []
self.dyn_ipv4_routes = {}
self.dyn_ipv6_routes = {}
self.dyn_arp_cache = {}
self.dyn_nd_cache = {}
self.dyn_host_cache = {}
if self.faucet_vips:
self.faucet_vips = [
ipaddress.ip_interface(btos(ip)) for ip in self.faucet_vips
]
if self.bgp_as:
assert self.bgp_port
assert ipaddress.IPv4Address(btos(self.bgp_routerid))
for neighbor_ip in self.bgp_neighbor_addresses:
assert ipaddress.ip_address(btos(neighbor_ip))
assert self.bgp_neighbor_as
if self.routes:
self.routes = [route['route'] for route in self.routes]
for route in self.routes:
ip_gw = ipaddress.ip_address(btos(route['ip_gw']))
ip_dst = ipaddress.ip_network(btos(route['ip_dst']))
assert ip_gw.version == ip_dst.version
if ip_gw.version == 4:
self.ipv4_routes[ip_dst] = ip_gw
else:
self.ipv6_routes[ip_dst] = ip_gw
def ipv6_solicited_node_from_ucast(ucast):
"""Return IPv6 solicited node multicast address from IPv6 unicast address.
See RFC 3513 section 2.7.1.
Args:
ucast (ipaddress.IPv6Address): IPv6 unicast address.
Returns:
ipaddress.IPv6Address: IPv6 solicited node multicast address.
"""
link_mcast_prefix = ipaddress.ip_interface(btos('ff02::1:ff00:0/104'))
mcast_bytes = link_mcast_prefix.packed[:13] + ucast.packed[-3:]
link_mcast = ipaddress.IPv6Address(mcast_bytes)
return link_mcast
def add_host_fib_route_from_pkt(self, pkt_meta):
"""Add a host FIB route given packet from host.
Args:
pkt_meta (PacketMeta): received packet.
Returns:
list: OpenFlow messages.
"""
ip_pkt = self._ip_pkt(pkt_meta.pkt)
ofmsgs = []
if ip_pkt:
src_ip = ipaddress.ip_address(btos(ip_pkt.src))
if src_ip and pkt_meta.vlan.ip_in_vip_subnet(src_ip):
ofmsgs.extend(
self._add_host_fib_route(pkt_meta.vlan, src_ip))
ofmsgs.extend(self._update_nexthop(
pkt_meta.vlan, pkt_meta.port, pkt_meta.eth_src, src_ip))
return ofmsgs
def _control_plane_icmpv6_handler(self, pkt_meta, ipv6_pkt):
ofmsgs = []
src_ip = ipaddress.IPv6Address(btos(ipv6_pkt.src))
dst_ip = ipaddress.IPv6Address(btos(ipv6_pkt.dst))
vlan = pkt_meta.vlan
if vlan.ip_in_vip_subnet(src_ip):
# Must be ICMPv6 and have no extended headers.
if ipv6_pkt.nxt != inet.IPPROTO_ICMPV6:
return ofmsgs
if ipv6_pkt.ext_hdrs:
return ofmsgs
# Explicitly ignore messages to all notes.
if dst_ip == valve_packet.IPV6_ALL_NODES:
return ofmsgs
pkt_meta.reparse_ip(self.ETH_TYPE, payload=32)
icmpv6_pkt = pkt_meta.pkt.get_protocol(icmpv6.icmpv6)
if icmpv6_pkt is None:
return ofmsgs
icmpv6_type = icmpv6_pkt.type_
if (ipv6_pkt.hop_limit != valve_packet.IPV6_MAX_HOP_LIM and
icmpv6_type != icmpv6.ICMPV6_ECHO_REQUEST):
return ofmsgs
port = pkt_meta.port
vid = self._vlan_vid(vlan, port)
eth_src = pkt_meta.eth_src
if icmpv6_type == icmpv6.ND_NEIGHBOR_SOLICIT:
solicited_ip = btos(icmpv6_pkt.data.dst)
if vlan.is_faucet_vip(ipaddress.ip_address(solicited_ip)):
ofmsgs.extend(
self._add_host_fib_route(vlan, src_ip))
ofmsgs.extend(self._update_nexthop(
vlan, port, eth_src, src_ip))
nd_reply = valve_packet.nd_advert(
vid, vlan.faucet_mac, eth_src,
solicited_ip, src_ip)
ofmsgs.append(
valve_of.packetout(port.number, nd_reply.data))
self.logger.info(
'Responded to ND solicit for %s to %s (%s) on VLAN %u' % (
solicited_ip, src_ip, eth_src, vlan.vid))
elif icmpv6_type == icmpv6.ND_NEIGHBOR_ADVERT:
ofmsgs.extend(self._update_nexthop(
vlan, port, eth_src, src_ip))
self.logger.info(
'ND advert %s (%s) on VLAN %u' % (
src_ip, eth_src, vlan.vid))
elif icmpv6_type == icmpv6.ND_ROUTER_SOLICIT:
link_local_vips, other_vips = self._link_and_other_vips(vlan)
for vip in link_local_vips:
if src_ip in vip.network:
ofmsgs.extend(
self._add_host_fib_route(vlan, src_ip))
ofmsgs.extend(self._update_nexthop(
vlan, port, eth_src, src_ip))
ra_advert = valve_packet.router_advert(
vlan, vid, vlan.faucet_mac, eth_src,
vip.ip, src_ip, other_vips)
ofmsgs.append(
valve_of.packetout(port.number, ra_advert.data))
self.logger.info(
'Responded to RS solicit from %s (%s) to VIP %s on VLAN %u' % (
src_ip, eth_src, vip, vlan.vid))
break
elif icmpv6_type == icmpv6.ICMPV6_ECHO_REQUEST:
if (vlan.from_connected_to_vip(src_ip, dst_ip) and
pkt_meta.eth_dst == vlan.faucet_mac):
icmpv6_echo_reply = valve_packet.icmpv6_echo_reply(
vid, vlan.faucet_mac, eth_src,
dst_ip, src_ip, ipv6_pkt.hop_limit,
icmpv6_pkt.data.id, icmpv6_pkt.data.seq,
icmpv6_pkt.data.data)
ofmsgs.append(
valve_of.packetout(port.number, icmpv6_echo_reply.data))
return ofmsgs
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import ipaddress
from ryu.lib import mac
from ryu.lib.packet import arp, ethernet, icmp, icmpv6, ipv4, ipv6, stream_parser, packet, vlan
from ryu.ofproto import ether
from ryu.ofproto import inet
from valve_util import btos
IPV6_ALL_NODES_MCAST = '33:33:00:00:00:01'
IPV6_ALL_ROUTERS_MCAST = '33:33:00:00:00:02'
IPV6_LINK_LOCAL = ipaddress.IPv6Network(btos('fe80::/10'))
IPV6_ALL_NODES = ipaddress.IPv6Address(btos('ff02::1'))
def mac_addr_is_unicast(mac_addr):
"""Returns True if mac_addr is a unicast Ethernet address.
Args:
mac_addr (str): MAC address.
Returns:
bool: True if a unicast Ethernet address.
"""
msb = mac_addr.split(':')[0]
return msb[-1] in '02468aAcCeE'
