235 lines
9.0 KiB
Python
235 lines
9.0 KiB
Python
# Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from os_ken.services.protocols.bgp.base import Activity
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from os_ken.lib import hub
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from os_ken.lib.packet import bmp
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from os_ken.lib.packet import bgp
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import socket
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import logging
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from calendar import timegm
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from os_ken.services.protocols.bgp.signals.emit import BgpSignalBus
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from os_ken.services.protocols.bgp.info_base.ipv4 import Ipv4Path
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from os_ken.lib.packet.bgp import BGPUpdate
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from os_ken.lib.packet.bgp import BGPPathAttributeMpUnreachNLRI
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LOG = logging.getLogger('bgpspeaker.bmp')
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class BMPClient(Activity):
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"""A BMP client.
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Try to establish BMP session between a configured BMP server.
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If BMP session is established, transfer information about peers
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(e.g. received and sent open msgs, contents of adj-rib-in, other stats)
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"""
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def __init__(self, core_service, host, port):
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super(BMPClient, self).__init__(name='BMPClient(%s:%s)' % (host, port))
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self._core_service = core_service
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self._core_service.signal_bus.register_listener(
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BgpSignalBus.BGP_ADJ_RIB_IN_CHANGED,
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lambda _, data: self.on_adj_rib_in_changed(data)
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)
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self._core_service.signal_bus.register_listener(
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BgpSignalBus.BGP_ADJ_UP,
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lambda _, data: self.on_adj_up(data)
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)
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self._core_service.signal_bus.register_listener(
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BgpSignalBus.BGP_ADJ_DOWN,
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lambda _, data: self.on_adj_down(data)
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)
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self._socket = None
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self.server_address = (host, port)
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self._connect_retry_event = hub.Event()
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self._connect_retry_time = 5
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def _run(self):
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self._connect_retry_event.set()
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while True:
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self._connect_retry_event.wait()
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try:
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self._connect_retry_event.clear()
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self._connect_tcp(self.server_address,
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self._handle_bmp_session)
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except socket.error:
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self._connect_retry_event.set()
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LOG.info('Will try to reconnect to %s after %s secs: %s',
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self.server_address, self._connect_retry_time,
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self._connect_retry_event.is_set())
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self.pause(self._connect_retry_time)
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def _send(self, msg):
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if not self._socket:
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return
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assert isinstance(msg, bmp.BMPMessage)
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self._socket.send(msg.serialize())
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def on_adj_rib_in_changed(self, data):
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peer = data['peer']
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path = data['received_route']
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msg = self._construct_route_monitoring(peer, path)
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self._send(msg)
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def on_adj_up(self, data):
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peer = data['peer']
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msg = self._construct_peer_up_notification(peer)
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self._send(msg)
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def on_adj_down(self, data):
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peer = data['peer']
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msg = self._construct_peer_down_notification(peer)
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self._send(msg)
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def _construct_peer_up_notification(self, peer):
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if peer.is_mpbgp_cap_valid(bgp.RF_IPv4_VPN) or \
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peer.is_mpbgp_cap_valid(bgp.RF_IPv6_VPN):
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peer_type = bmp.BMP_PEER_TYPE_L3VPN
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else:
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peer_type = bmp.BMP_PEER_TYPE_GLOBAL
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peer_distinguisher = 0
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peer_as = peer._neigh_conf.remote_as
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peer_bgp_id = peer.protocol.recv_open_msg.bgp_identifier
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timestamp = peer.state._established_time
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local_address = peer.host_bind_ip
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local_port = int(peer.host_bind_port)
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peer_address, remote_port = peer.protocol._remotename
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remote_port = int(remote_port)
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sent_open_msg = peer.protocol.sent_open_msg
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recv_open_msg = peer.protocol.recv_open_msg
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msg = bmp.BMPPeerUpNotification(local_address=local_address,
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local_port=local_port,
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remote_port=remote_port,
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sent_open_message=sent_open_msg,
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received_open_message=recv_open_msg,
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peer_type=peer_type,
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is_post_policy=False,
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peer_distinguisher=peer_distinguisher,
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peer_address=peer_address,
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peer_as=peer_as,
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peer_bgp_id=peer_bgp_id,
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timestamp=timestamp)
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return msg
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def _construct_peer_down_notification(self, peer):
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if peer.is_mpbgp_cap_valid(bgp.RF_IPv4_VPN) or \
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peer.is_mpbgp_cap_valid(bgp.RF_IPv6_VPN):
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peer_type = bmp.BMP_PEER_TYPE_L3VPN
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else:
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peer_type = bmp.BMP_PEER_TYPE_GLOBAL
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peer_as = peer._neigh_conf.remote_as
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peer_bgp_id = peer.protocol.recv_open_msg.bgp_identifier
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peer_address, _ = peer.protocol._remotename
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return bmp.BMPPeerDownNotification(bmp.BMP_PEER_DOWN_REASON_UNKNOWN,
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data=None,
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peer_type=peer_type,
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is_post_policy=False,
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peer_distinguisher=0,
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peer_address=peer_address,
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peer_as=peer_as,
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peer_bgp_id=peer_bgp_id,
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timestamp=0)
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def _construct_update(self, path):
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# Get copy of path's path attributes.
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new_pathattr = [attr for attr in path.pathattr_map.values()]
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if path.is_withdraw:
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if isinstance(path, Ipv4Path):
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return BGPUpdate(withdrawn_routes=[path.nlri],
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path_attributes=new_pathattr)
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else:
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mpunreach_attr = BGPPathAttributeMpUnreachNLRI(
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path.route_family.afi, path.route_family.safi, [path.nlri]
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)
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new_pathattr.append(mpunreach_attr)
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else:
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if isinstance(path, Ipv4Path):
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return BGPUpdate(nlri=[path.nlri],
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path_attributes=new_pathattr)
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return BGPUpdate(path_attributes=new_pathattr)
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def _construct_route_monitoring(self, peer, route):
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if peer.is_mpbgp_cap_valid(bgp.RF_IPv4_VPN) or \
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peer.is_mpbgp_cap_valid(bgp.RF_IPv6_VPN):
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peer_type = bmp.BMP_PEER_TYPE_L3VPN
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else:
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peer_type = bmp.BMP_PEER_TYPE_GLOBAL
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peer_distinguisher = 0
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peer_as = peer._neigh_conf.remote_as
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peer_bgp_id = peer.protocol.recv_open_msg.bgp_identifier
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peer_address, _ = peer.protocol._remotename
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bgp_update = self._construct_update(route.path)
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is_post_policy = not route.filtered
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timestamp = timegm(route.timestamp)
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msg = bmp.BMPRouteMonitoring(bgp_update=bgp_update,
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peer_type=peer_type,
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is_post_policy=is_post_policy,
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peer_distinguisher=peer_distinguisher,
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peer_address=peer_address,
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peer_as=peer_as, peer_bgp_id=peer_bgp_id,
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timestamp=timestamp)
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return msg
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def _handle_bmp_session(self, socket):
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self._socket = socket
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# send init message
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init_info = {'type': bmp.BMP_INIT_TYPE_STRING,
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'value': u'This is OSKen BGP BMP message'}
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init_msg = bmp.BMPInitiation([init_info])
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self._send(init_msg)
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# send peer-up message for each peers
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peer_manager = self._core_service.peer_manager
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for peer in (p for p in peer_manager.iterpeers if p.in_established()):
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msg = self._construct_peer_up_notification(peer)
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self._send(msg)
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for path in peer._adj_rib_in.values():
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msg = self._construct_route_monitoring(peer, path)
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self._send(msg)
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# TODO periodically send stats to bmpstation
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while True:
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# bmpstation shouldn't send any packet to bmpclient.
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# this recv() is only meant to detect socket closed
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ret = self._socket.recv(1)
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if len(ret) == 0:
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LOG.debug('BMP socket is closed. retry connecting..')
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self._socket = None
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self._connect_retry_event.set()
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break
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# silently ignore packets from the bmpstation
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