0c7952cfd7
self._localname() is invalid before a connection establishes. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
594 lines
23 KiB
Python
594 lines
23 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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"""
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BGP protocol implementation.
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"""
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import logging
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import socket
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import struct
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import traceback
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from socket import IPPROTO_TCP, TCP_NODELAY
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from eventlet import semaphore
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from ryu.lib.packet import bgp
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from ryu.lib.packet.bgp import RouteFamily
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from ryu.lib.packet.bgp import RF_RTC_UC
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from ryu.lib.packet.bgp import BGPMessage
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from ryu.lib.packet.bgp import BGPOpen
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from ryu.lib.packet.bgp import BGPUpdate
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from ryu.lib.packet.bgp import BGPKeepAlive
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from ryu.lib.packet.bgp import BGPNotification
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from ryu.lib.packet.bgp import BGPRouteRefresh
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from ryu.lib.packet.bgp import BGP_MSG_OPEN
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from ryu.lib.packet.bgp import BGP_MSG_UPDATE
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from ryu.lib.packet.bgp import BGP_MSG_KEEPALIVE
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from ryu.lib.packet.bgp import BGP_MSG_NOTIFICATION
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from ryu.lib.packet.bgp import BGP_MSG_ROUTE_REFRESH
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from ryu.lib.packet.bgp import BGP_CAP_ENHANCED_ROUTE_REFRESH
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from ryu.lib.packet.bgp import BGP_CAP_MULTIPROTOCOL
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from ryu.lib.packet.bgp import BGP_CAP_ROUTE_REFRESH
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from ryu.lib.packet.bgp import BGP_ERROR_HOLD_TIMER_EXPIRED
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from ryu.lib.packet.bgp import BGP_ERROR_SUB_HOLD_TIMER_EXPIRED
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from ryu.services.protocols.bgp.base import Activity
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from ryu.services.protocols.bgp.base import add_bgp_error_metadata
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from ryu.services.protocols.bgp.base import BGPSException
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from ryu.services.protocols.bgp.base import CORE_ERROR_CODE
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from ryu.services.protocols.bgp.constants import BGP_FSM_CONNECT
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from ryu.services.protocols.bgp.constants import BGP_FSM_OPEN_CONFIRM
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from ryu.services.protocols.bgp.constants import BGP_FSM_OPEN_SENT
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from ryu.services.protocols.bgp.constants import BGP_VERSION_NUM
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from ryu.services.protocols.bgp.protocol import Protocol
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from ryu.services.protocols.bgp.utils.validation import is_valid_old_asn
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LOG = logging.getLogger('bgpspeaker.speaker')
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# BGP min. and max. message lengths as per RFC.
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BGP_MIN_MSG_LEN = 19
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BGP_MAX_MSG_LEN = 4096
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# Keep-alive singleton.
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_KEEP_ALIVE = BGPKeepAlive()
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@add_bgp_error_metadata(code=CORE_ERROR_CODE, sub_code=2,
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def_desc='Unknown error occurred related to Speaker.')
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class BgpProtocolException(BGPSException):
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"""Base exception related to peer connection management.
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"""
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pass
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def nofitication_factory(code, subcode):
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"""Returns a `Notification` message corresponding to given codes.
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Parameters:
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- `code`: (int) BGP error code
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- `subcode`: (int) BGP error sub-code
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"""
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notification = BGPNotification(code, subcode)
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if not notification.reason:
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raise ValueError('Invalid code/sub-code.')
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return notification
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class BgpProtocol(Protocol, Activity):
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"""Protocol that handles BGP messages.
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"""
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MESSAGE_MARKER = ('\xff\xff\xff\xff\xff\xff\xff\xff'
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'\xff\xff\xff\xff\xff\xff\xff\xff')
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def __init__(self, socket, signal_bus, is_reactive_conn=False):
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# Validate input.
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if socket is None:
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raise ValueError('Invalid arguments passed.')
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self._remotename = self.get_remotename(socket)
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self._localname = self.get_localname(socket)
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activity_name = ('BgpProtocol %s, %s, %s' % (is_reactive_conn,
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self._remotename,
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self._localname))
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Activity.__init__(self, name=activity_name)
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# Intialize instance variables.
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self._peer = None
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self._recv_buff = ''
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self._socket = socket
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self._socket.setsockopt(IPPROTO_TCP, TCP_NODELAY, 1)
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self._sendlock = semaphore.Semaphore()
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self._signal_bus = signal_bus
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self._holdtime = None
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self._keepalive = None
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self._expiry = None
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# Add socket to Activity's socket container for managing it.
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if is_reactive_conn:
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self._asso_socket_map['passive_conn'] = self._socket
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else:
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self._asso_socket_map['active_conn'] = self._socket
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self._open_msg = None
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self.state = BGP_FSM_CONNECT
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self._is_reactive = is_reactive_conn
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self.sent_open_msg = None
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self.recv_open_msg = None
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self._is_bound = False
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@property
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def is_reactive(self):
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return self._is_reactive
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@property
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def holdtime(self):
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return self._holdtime
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@property
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def keepalive(self):
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return self._keepalive
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def is_colliding(self, other_protocol):
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if not isinstance(other_protocol, BgpProtocol):
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raise ValueError('Currently only support comparing with '
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'`BgpProtocol`')
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# Compare protocol connection end point's addresses
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if (self._remotename[0] == other_protoco._remotename[0] and
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self._localname[0] == other_protocol._localname[0]):
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return True
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return False
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def is_local_router_id_greater(self):
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"""Compares *True* if local router id is greater when compared to peer
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bgp id.
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Should only be called after protocol has reached OpenConfirm state.
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"""
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from ryu.services.protocols.bgp.utils.bgp import from_inet_ptoi
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if not self.state == BGP_FSM_OPEN_CONFIRM:
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raise BgpProtocolException(desc='Can access remote router id only'
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' after open message is received')
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remote_id = self.recv_open_msg.bgp_identifier
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local_id = self.sent_open_msg.bgp_identifier
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return from_inet_ptoi(local_id) > from_inet_ptoi(remote_id)
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def is_enhanced_rr_cap_valid(self):
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"""Checks is enhanced route refresh capability is enabled/valid.
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Checks sent and received `Open` messages to see if this session with
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peer is capable of enhanced route refresh capability.
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"""
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if not self.recv_open_msg:
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raise ValueError('Did not yet receive peers open message.')
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err_cap_enabled = False
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local_cap = self.sent_open_msg.caps
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peer_cap = self.recv_open_msg.caps
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# Both local and peer should advertise ERR capability for it to be
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# enabled.
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if (local_cap.get(BGP_CAP_ENHANCED_ROUTE_REFRESH) and
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peer_cap.get(BGP_CAP_ENHANCED_ROUTE_REFRESH)):
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err_cap_enabled = True
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return err_cap_enabled
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def _check_route_fmly_adv(self, open_msg, route_family):
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match_found = False
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local_caps = open_msg.opt_param
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for cap in local_caps:
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# Check MP_BGP capability was advertised.
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if cap.cap_code == BGP_CAP_MULTIPROTOCOL:
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# Iterate over all advertised mp_bgp caps to find a match.
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if (route_family.afi == cap.afi and
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route_family.safi == cap.safi):
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match_found = True
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return match_found
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def is_route_family_adv(self, route_family):
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"""Checks if `route_family` was advertised to peer as per MP_BGP cap.
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Returns:
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- True: if given address family was advertised.
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- False: if given address family was not advertised.
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"""
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return self._check_route_fmly_adv(self.sent_open_msg, route_family)
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def is_route_family_adv_recv(self, route_family):
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"""Checks if `route_family` was advertised by peer as per MP_BGP cap.
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Returns:
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- True: if given address family was advertised.
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- False: if given address family was not advertised.
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"""
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return self._check_route_fmly_adv(self.recv_open_msg, route_family)
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@property
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def negotiated_afs(self):
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local_caps = self.sent_open_msg.caps
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remote_caps = self.recv_open_msg.caps
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local_mbgp_cap = local_caps.get(BGP_CAP_MULTIPROTOCOL)
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remote_mbgp_cap = remote_caps.get(BGP_CAP_MULTIPROTOCOL)
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# Check MP_BGP capabilities were advertised.
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if local_mbgp_cap and remote_mbgp_cap:
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local_families = {
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(peer_cap.route_family.afi, peer_cap.route_family.safi)
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for peer_cap in local_mbgp_cap
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}
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remote_families = {
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(peer_cap.route_family.afi, peer_cap.route_family.safi)
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for peer_cap in remote_mbgp_cap
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}
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afi_safi = local_families.intersection(remote_families)
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else:
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afi_safi = set()
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afs = []
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for afi, safi in afi_safi:
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afs.append(RouteFamily(afi, safi))
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return afs
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def is_mbgp_cap_valid(self, route_family):
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"""Returns true if both sides of this protocol have advertise
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capability for this address family.
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"""
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return (self.is_route_family_adv(route_family) and
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self.is_route_family_adv_recv(route_family))
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def _run(self, peer):
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"""Sends open message to peer and handles received messages.
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Parameters:
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- `peer`: the peer to which this protocol instance is connected to.
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"""
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# We know the peer we are connected to, we send open message.
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self._peer = peer
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self.connection_made()
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# We wait for peer to send messages.
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self._recv_loop()
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def data_received(self, next_bytes):
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try:
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self._data_received(next_bytes)
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except bgp.BgpExc as exc:
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LOG.error(
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"BGPExc Exception while receiving data: "
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"%s \n Traceback %s \n"
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% (str(exc), traceback.format_exc())
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)
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if exc.SEND_ERROR:
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self.send_notification(exc.CODE, exc.SUB_CODE)
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else:
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self._socket.close()
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raise exc
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@staticmethod
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def parse_msg_header(buff):
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"""Parses given `buff` into bgp message header format.
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Returns a tuple of marker, length, type of bgp message.
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"""
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return struct.unpack('!16sHB', buff)
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def _data_received(self, next_bytes):
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"""Maintains buffer of bytes received from peer and extracts bgp
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message from this buffer if enough data is received.
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Validates bgp message marker, length, type and data and constructs
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appropriate bgp message instance and calls handler.
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:Parameters:
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- `next_bytes`: next set of bytes received from peer.
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"""
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# Append buffer with received bytes.
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self._recv_buff += next_bytes
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while True:
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# If current buffer size is less then minimum bgp message size, we
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# return as we do not have a complete bgp message to work with.
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if len(self._recv_buff) < BGP_MIN_MSG_LEN:
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return
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# Parse message header into elements.
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auth, length, ptype = BgpProtocol.parse_msg_header(
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self._recv_buff[:BGP_MIN_MSG_LEN])
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# Check if we have valid bgp message marker.
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# We should get default marker since we are not supporting any
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# authentication.
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if (auth != BgpProtocol.MESSAGE_MARKER):
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LOG.error('Invalid message marker received: %s' % auth)
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raise bgp.NotSync()
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# Check if we have valid bgp message length.
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check = lambda: length < BGP_MIN_MSG_LEN\
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or length > BGP_MAX_MSG_LEN
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# RFC says: The minimum length of the OPEN message is 29
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# octets (including the message header).
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check2 = lambda: ptype == BGP_MSG_OPEN\
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and length < BGPOpen._MIN_LEN
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# RFC says: A KEEPALIVE message consists of only the
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# message header and has a length of 19 octets.
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check3 = lambda: ptype == BGP_MSG_KEEPALIVE\
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and length != BGPKeepAlive._MIN_LEN
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# RFC says: The minimum length of the UPDATE message is 23
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# octets.
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check4 = lambda: ptype == BGP_MSG_UPDATE\
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and length < BGPUpdate._MIN_LEN
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if check() or check2() or check3() or check4():
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raise bgp.BadLen(ptype, length)
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# If we have partial message we wait for rest of the message.
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if len(self._recv_buff) < length:
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return
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msg, rest = BGPMessage.parser(self._recv_buff)
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self._recv_buff = rest
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# If we have a valid bgp message we call message handler.
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self._handle_msg(msg)
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def send_notification(self, code, subcode):
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"""Utility to send notification message.
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Closes the socket after sending the message.
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:Parameters:
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- `socket`: (socket) - socket over which to send notification
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message.
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- `code`: (int) - BGP Notification code
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- `subcode`: (int) - BGP Notification sub-code
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RFC ref: http://tools.ietf.org/html/rfc4486
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http://www.iana.org/assignments/bgp-parameters/bgp-parameters.xhtml
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"""
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notification = BGPNotification(code, subcode)
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reason = notification.reason
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self._send_with_lock(notification)
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self._signal_bus.bgp_error(self._peer, code, subcode, reason)
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if len(self._localname()):
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LOG.error('Sent notification to %r >> %s' % (self._localname(),
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notification))
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self._socket.close()
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def _send_with_lock(self, msg):
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self._sendlock.acquire()
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try:
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self._socket.sendall(msg.serialize())
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except socket.error as err:
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self.connection_lost('failed to write to socket')
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finally:
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self._sendlock.release()
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def send(self, msg):
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if not self.started:
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raise BgpProtocolException('Tried to send message to peer when '
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'this protocol instance is not started'
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' or is no longer is started state.')
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self._send_with_lock(msg)
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if msg.type == BGP_MSG_NOTIFICATION:
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LOG.error('Sent notification to %s >> %s' %
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(self._remotename, msg))
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self._signal_bus.bgp_notification_sent(self._peer, msg)
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else:
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LOG.debug('Sent msg to %s >> %s' % (self._remotename, msg))
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def stop(self):
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Activity.stop(self)
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def _validate_open_msg(self, open_msg):
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"""Validates BGP OPEN message according from application context.
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Parsing modules takes care of validating OPEN message that need no
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context. But here we validate it according to current application
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settings. RTC or RR/ERR are MUST capability if peer does not support
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either one of them we have to end session.
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"""
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assert open_msg.type == BGP_MSG_OPEN
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# Validate remote ASN.
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remote_asnum = open_msg.my_as
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# Since 4byte AS is not yet supported, we validate AS as old style AS.
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if (not is_valid_old_asn(remote_asnum) or
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remote_asnum != self._peer.remote_as):
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raise bgp.BadPeerAs()
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# Validate bgp version number.
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if open_msg.version != BGP_VERSION_NUM:
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raise bgp.UnsupportedVersion(BGP_VERSION_NUM)
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adv_caps = open_msg.opt_param
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for cap in adv_caps:
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if cap.cap_code == BGP_CAP_ROUTE_REFRESH:
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rr_cap_adv = cap
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elif cap.cap_code == BGP_CAP_ENHANCED_ROUTE_REFRESH:
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err_cap_adv = cap
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# If either RTC or RR/ERR are MUST capability if peer does not support
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# either one of them we have to end session as we have to request peer
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# to send prefixes for new VPNs that may be created automatically.
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# TODO(PH): Check with experts if error is suitable in this case
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if not (rr_cap_adv or err_cap_adv or
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self._check_route_fmly_adv(open_msg, RF_RTC_UC)):
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raise bgp.UnsupportedOptParam()
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def _handle_msg(self, msg):
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"""When a BGP message is received, send it to peer.
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Open messages are validated here. Peer handler is called to handle each
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message except for *Open* and *Notification* message. On receiving
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*Notification* message we close connection with peer.
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"""
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LOG.debug('Received msg from %s << %s' % (self._remotename, msg))
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# If we receive open message we try to bind to protocol
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if (msg.type == BGP_MSG_OPEN):
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if self.state == BGP_FSM_OPEN_SENT:
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# Validate open message.
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self._validate_open_msg(msg)
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self.recv_open_msg = msg
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self.state = BGP_FSM_OPEN_CONFIRM
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self._peer.state.bgp_state = self.state
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# Try to bind this protocol to peer.
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self._is_bound = self._peer.bind_protocol(self)
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# If this protocol failed to bind to peer.
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if not self._is_bound:
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# Failure to bind to peer indicates connection collision
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# resolution choose different instance of protocol and this
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# instance has to close. Before closing it sends
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# appropriate notification msg. to peer.
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raise bgp.CollisionResolution()
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# If peer sends Hold Time as zero, then according to RFC we do
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# not set Hold Time and Keep Alive timer.
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if msg.hold_time == 0:
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LOG.info('The Hold Time sent by the peer is zero, hence '
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'not setting any Hold Time and Keep Alive'
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' timers.')
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else:
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# Start Keep Alive timer considering Hold Time preference
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# of the peer.
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self._start_timers(msg.hold_time)
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self._send_keepalive()
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# Peer does not see open message.
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return
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else:
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# If we receive a Open message out of order
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LOG.error('Open message received when current state is not '
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'OpenSent')
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# Received out-of-order open message
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# We raise Finite state machine error
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raise bgp.FiniteStateMachineError()
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elif msg.type == BGP_MSG_NOTIFICATION:
|
|
if self._peer:
|
|
self._signal_bus.bgp_notification_received(self._peer, msg)
|
|
# If we receive notification message
|
|
LOG.error('Received notification message, hence closing '
|
|
'connection %s' % msg)
|
|
self._socket.close()
|
|
return
|
|
|
|
# If we receive keepalive or update message, we reset expire timer.
|
|
if (msg.type == BGP_MSG_KEEPALIVE or
|
|
msg.type == BGP_MSG_UPDATE):
|
|
if self._expiry:
|
|
self._expiry.reset()
|
|
|
|
# Call peer message handler for appropriate messages.
|
|
if (msg.type in
|
|
(BGP_MSG_UPDATE, BGP_MSG_KEEPALIVE, BGP_MSG_ROUTE_REFRESH)):
|
|
self._peer.handle_msg(msg)
|
|
# We give chance to other threads to run.
|
|
self.pause(0)
|
|
|
|
def _start_timers(self, peer_holdtime):
|
|
"""Starts keepalive and expire timers.
|
|
|
|
Hold time is set to min. of peer and configured/default hold time.
|
|
Starts keep alive timer and expire timer based on this value.
|
|
"""
|
|
neg_timer = min(self._holdtime, peer_holdtime)
|
|
if neg_timer < self._holdtime:
|
|
LOG.info('Negotiated hold time (%s) is lower then '
|
|
'configured/default (%s).' % (neg_timer, self._holdtime))
|
|
# We use negotiated timer value.
|
|
self._holdtime = neg_timer
|
|
self._keepalive = self._create_timer('Keepalive Timer',
|
|
self._send_keepalive)
|
|
interval = self._holdtime / 3
|
|
self._keepalive.start(interval, now=False)
|
|
# Setup the expire timer.
|
|
self._expiry = self._create_timer('Holdtime Timer', self._expired)
|
|
self._expiry.start(self._holdtime, now=False)
|
|
LOG.debug('Started keep-alive and expire timer for negotiated hold'
|
|
'time %s' % self._holdtime)
|
|
|
|
def _expired(self):
|
|
"""Hold timer expired event handler.
|
|
"""
|
|
LOG.info('Negotiated hold time %s expired.' % self._holdtime)
|
|
code = BGP_ERROR_HOLD_TIMER_EXPIRED
|
|
subcode = BGP_ERROR_SUB_HOLD_TIMER_EXPIRED
|
|
self.send_notification(code, subcode)
|
|
self.connection_lost('Negotiated hold time %s expired.' %
|
|
self._holdtime)
|
|
self.stop()
|
|
|
|
def _send_keepalive(self):
|
|
self.send(_KEEP_ALIVE)
|
|
|
|
def _recv_loop(self):
|
|
"""Sits in tight loop collecting data received from peer and
|
|
processing it.
|
|
"""
|
|
required_len = BGP_MIN_MSG_LEN
|
|
conn_lost_reason = "Connection lost as protocol is no longer active"
|
|
try:
|
|
while True:
|
|
next_bytes = self._socket.recv(required_len)
|
|
if len(next_bytes) == 0:
|
|
conn_lost_reason = 'Peer closed connection'
|
|
break
|
|
self.data_received(next_bytes)
|
|
except socket.error as err:
|
|
conn_lost_reason = 'Connection to peer lost: %s.' % err
|
|
except bgp.BgpExc as ex:
|
|
conn_lost_reason = 'Connection to peer lost, reason: %s.' % ex
|
|
except Exception as e:
|
|
LOG.debug(traceback.format_exc())
|
|
conn_lost_reason = str(e)
|
|
finally:
|
|
self.connection_lost(conn_lost_reason)
|
|
|
|
def connection_made(self):
|
|
"""Connection to peer handler.
|
|
|
|
We send bgp open message to peer and intialize related attributes.
|
|
"""
|
|
assert self.state == BGP_FSM_CONNECT
|
|
# We have a connection with peer we send open message.
|
|
open_msg = self._peer.create_open_msg()
|
|
self._holdtime = open_msg.hold_time
|
|
self.state = BGP_FSM_OPEN_SENT
|
|
if not self.is_reactive:
|
|
self._peer.state.bgp_state = self.state
|
|
self.sent_open_msg = open_msg
|
|
self.send(open_msg)
|
|
self._peer.connection_made()
|
|
LOG.debug('Sent open message %s' % open_msg)
|
|
|
|
def connection_lost(self, reason):
|
|
"""Stops all timers and notifies peer that connection is lost.
|
|
"""
|
|
|
|
if self._peer:
|
|
state = self._peer.state.bgp_state
|
|
if self._is_bound or state == BGP_FSM_OPEN_SENT:
|
|
self._peer.connection_lost(reason)
|
|
|
|
self._peer = None
|
|
|
|
if reason:
|
|
LOG.info(reason)
|
|
else:
|
|
LOG.info('Connection to peer closed for unknown reasons.')
|