def UpdateFactory(self, data):
length = len(data)
# withdrawn
lw, withdrawn, data = defix(data)
if len(withdrawn) != lw:
raise Notify(3, 1)
la, attribute, announced = defix(data)
if len(attribute) != la:
raise Notify(3, 1)
# The RFC check ...
#if lw + la + 23 > length:
if 2 + lw + 2 + la + len(announced) != length:
raise Notify(3, 1)
routes = []
while withdrawn:
nlri = BGPPrefix(AFI.ipv4, withdrawn)
route = ReceivedRoute(nlri, 'withdraw')
withdrawn = withdrawn[len(nlri):]
routes.append(route)
self.mp_routes = []
attributes = self.AttributesFactory(attribute)
routes.extend(self.mp_routes)
while announced:
nlri = BGPPrefix(AFI.ipv4, announced)
route = ReceivedRoute(nlri, 'announce')
# XXX: Should this be a deep copy
route.attributes = attributes
announced = announced[len(nlri):]
routes.append(route)
#logger.info(self.me('Received route %s' % nlri))
#print "routes", routes
#print "attributes", attributes
if routes:
return Update(routes)
return NOP('')
def UpdateFactory (self,data):
length = len(data)
# withdrawn
lw,withdrawn,data = defix(data)
if len(withdrawn) != lw:
raise Notify(3,1)
la,attribute,announced = defix(data)
if len(attribute) != la:
raise Notify(3,1)
# The RFC check ...
#if lw + la + 23 > length:
if 2 + lw + 2+ la + len(announced) != length:
raise Notify(3,1)
routes = []
while withdrawn:
nlri = BGPPrefix(AFI.ipv4,withdrawn)
route = ReceivedRoute(nlri,'withdraw')
withdrawn = withdrawn[len(nlri):]
routes.append(route)
self.mp_routes = []
attributes = self.AttributesFactory(attribute)
routes.extend(self.mp_routes)
while announced:
nlri = BGPPrefix(AFI.ipv4,announced)
route = ReceivedRoute(nlri,'announce')
# XXX: Should this be a deep copy
route.attributes = attributes
announced = announced[len(nlri):]
routes.append(route)
#logger.info(self.me('Received route %s' % nlri))
#print "routes", routes
#print "attributes", attributes
if routes:
return Update(routes)
return NOP('')
def _AttributesFactory(self, data):
if not data:
return self
# We do not care if the attribute are transitive or not as we do not redistribute
flag = Flag(ord(data[0]))
code = AttributeID(ord(data[1]))
if flag & Flag.EXTENDED_LENGTH:
length = unpack('!H', data[2:4])[0]
offset = 4
else:
length = ord(data[2])
offset = 3
data = data[offset:]
# if not length:
# return self._AttributesFactory(data[length:])
# XXX: This code does not make sure that attributes are unique - or does it ?
if code == AttributeID.ORIGIN:
logger.parser('parsing origin')
self.attributes.add(Origin(ord(data[0])))
return self._AttributesFactory(data[length:])
if code == AttributeID.AS_PATH:
logger.parser('parsing as_path')
self.attributes.add(self.__new_ASPath(data[:length], self._asn4))
if not self._asn4 and self.attributes.has(AttributeID.AS4_PATH):
self.__merge_attributes()
return self._AttributesFactory(data[length:])
if code == AttributeID.AS4_PATH:
logger.parser('parsing as_path')
self.attributes.add(self.__new_AS4Path(data[:length]))
if not self._asn4 and self.attributes.has(AttributeID.AS_PATH):
self.__merge_attributes()
return self._AttributesFactory(data[length:])
if code == AttributeID.NEXT_HOP:
logger.parser('parsing next-hop')
self.attributes.add(NextHop(Inet(AFI.ipv4, data[:4])))
return self._AttributesFactory(data[length:])
if code == AttributeID.MED:
logger.parser('parsing med')
self.attributes.add(MED(unpack('!L', data[:4])[0]))
return self._AttributesFactory(data[length:])
if code == AttributeID.LOCAL_PREF:
logger.parser('parsing local-preference')
self.attributes.add(LocalPreference(unpack('!L', data[:4])[0]))
return self._AttributesFactory(data[length:])
if code == AttributeID.ORIGINATOR_ID:
logger.parser('parsing originator-id')
self.attributes.add(OriginatorId.unpack(data[:4]))
return self._AttributesFactory(data[length:])
if code == AttributeID.PMSI_TUNNEL:
logger.parser('parsing pmsi-tunnel')
self.attributes.add(PMSITunnel.unpack(data[:length]))
return self._AttributesFactory(data[length:])
if code == AttributeID.ATOMIC_AGGREGATE:
logger.parser('ignoring atomic-aggregate')
return self._AttributesFactory(data[length:])
if code == AttributeID.AGGREGATOR:
logger.parser('ignoring aggregator')
return self._AttributesFactory(data[length:])
if code == AttributeID.AS4_AGGREGATOR:
logger.parser('ignoring as4_aggregator')
return self._AttributesFactory(data[length:])
if code == AttributeID.COMMUNITY:
logger.parser('parsing communities')
self.attributes.add(self.__new_communities(data[:length]))
return self._AttributesFactory(data[length:])
if code == AttributeID.EXTENDED_COMMUNITY:
logger.parser('parsing communities')
self.attributes.add(self.__new_extended_communities(data[:length]))
return self._AttributesFactory(data[length:])
if code == AttributeID.MP_UNREACH_NLRI:
logger.parser('parsing multi-protocol nlri unreacheable')
next_attributes = data[length:]
data = data[:length]
afi, safi = unpack('!HB', data[:3])
offset = 3
# See RFC 5549 for better support
if not afi in (AFI.ipv4, AFI.ipv6, AFI.l2vpn) or (not safi in (
SAFI.unicast, SAFI.mpls_vpn, SAFI.rtc, SAFI.evpn)):
#self.log.out('we only understand IPv4/IPv6 and should never have received this MP_UNREACH_NLRI (%s %s)' % (afi,safi))
raise Exception(
"Unsupported AFI/SAFI received !! not supposed to happen here..."
)
return self._AttributesFactory(next_attributes)
data = data[offset:]
while data:
if safi == SAFI.unicast:
route = ReceivedRoute(BGPPrefix(afi, data), 'withdraw')
elif (afi == AFI.ipv4 and safi == SAFI.mpls_vpn):
route = ReceivedRoute(
VPNLabelledPrefix.unpack(afi, safi, data), 'withdraw')
elif (afi == AFI.ipv4 and safi == SAFI.rtc):
route = ReceivedRoute(
RouteTargetConstraint.unpack(afi, safi, data),
'withdraw')
elif (afi == AFI.l2vpn and safi == SAFI.evpn):
route = ReceivedRoute(EVPNNLRI.unpack(data), 'withdraw')
else:
raise Exception("Unsupported AFI/SAFI combination !!")
return self._AttributesFactory(next_attributes)
data = data[len(route.nlri):]
self.mp_routes.append(route)
return self._AttributesFactory(next_attributes)
if code == AttributeID.MP_REACH_NLRI:
logger.parser('parsing multi-protocol nlri reacheable')
next_attributes = data[length:]
data = data[:length]
afi, safi = unpack('!HB', data[:3])
offset = 3
if not afi in (AFI.ipv4, AFI.ipv6, AFI.l2vpn) or (not safi in (
SAFI.unicast, SAFI.mpls_vpn, SAFI.rtc, SAFI.evpn)):
#self.log.out('we only understand IPv4/IPv6 and should never have received this MP_REACH_NLRI (%s %s)' % (afi,safi))
raise Exception(
"Unsupported AFI/SAFI received !! not supposed to happen here..."
)
return self._AttributesFactory(next_attributes)
len_nh = ord(data[offset])
offset += 1
if afi == AFI.ipv4 and safi in (
SAFI.unicast, ) and not len_nh == 4:
# We are not following RFC 4760 Section 7 (deleting route and possibly tearing down the session)
#self.log.out('bad IPv4 next-hop length (%d)' % len_nh)
return self._AttributesFactory(next_attributes)
if afi == AFI.ipv6 and safi in (
SAFI.unicast, ) and not len_nh in (16, 32):
# We are not following RFC 4760 Section 7 (deleting route and possibly tearing down the session)
#self.log.out('bad IPv6 next-hop length (%d)' % len_nh)
return self._AttributesFactory(next_attributes)
nh = data[offset:offset + len_nh]
offset += len_nh
if len_nh == 32:
# we have a link-local address in the next-hop we ideally need to ignore
if nh[0] == chr(0xfe): nh = nh[16:]
elif nh[16] == chr(0xfe):
nh = nh[:16]
# We are not following RFC 4760 Section 7 (deleting route and possibly tearing down the session)
else:
return self._AttributesFactory(next_attributes)
if len_nh >= 16: nh = socket.inet_ntop(socket.AF_INET6, nh)
else:
if (safi in (SAFI.mpls_vpn, )):
# the next-hop is preceded by an rdtype and a 6-byte RD, we don't care about the RD yet
nh = socket.inet_ntop(socket.AF_INET, nh[8:])
else:
nh = socket.inet_ntop(socket.AF_INET, nh)
nb_snpa = ord(data[offset])
offset += 1
snpas = []
for _ in range(nb_snpa):
len_snpa = ord(offset)
offset += 1
snpas.append(data[offset:offset + len_snpa])
offset += len_snpa
data = data[offset:]
while data:
if safi == SAFI.unicast:
route = ReceivedRoute(BGPPrefix(afi, data), 'announce')
elif (afi == AFI.ipv4 and safi == SAFI.mpls_vpn):
route = ReceivedRoute(
VPNLabelledPrefix.unpack(afi, safi, data), 'announce')
elif (afi == AFI.ipv4 and safi == SAFI.rtc):
route = ReceivedRoute(
RouteTargetConstraint.unpack(afi, safi, data),
'announce')
elif (afi == AFI.l2vpn and safi == SAFI.evpn):
route = ReceivedRoute(EVPNNLRI.unpack(data), 'announce')
else:
raise Exception("Unsupported AFI/SAFI combination !!")
return self._AttributesFactory(next_attributes)
data = data[len(route.nlri):]
route.attributes = self.attributes
route.attributes.add(NextHop(to_IP(nh)))
self.mp_routes.append(route)
return self._AttributesFactory(next_attributes)
logger.warning(
"ignoring attributes of type %s %s" %
(str(code), [hex(ord(_)) for _ in data]), 'parsing')
return self._AttributesFactory(data[length:])
def _AttributesFactory (self,data):
if not data:
return self
# We do not care if the attribute are transitive or not as we do not redistribute
flag = Flag(ord(data[0]))
code = AttributeID(ord(data[1]))
if flag & Flag.EXTENDED_LENGTH:
length = unpack('!H',data[2:4])[0]
offset = 4
else:
length = ord(data[2])
offset = 3
data = data[offset:]
# if not length:
# return self._AttributesFactory(data[length:])
# XXX: This code does not make sure that attributes are unique - or does it ?
if code == AttributeID.ORIGIN:
logger.parser('parsing origin')
self.attributes.add(Origin(ord(data[0])))
return self._AttributesFactory(data[length:])
if code == AttributeID.AS_PATH:
logger.parser('parsing as_path')
self.attributes.add(self.__new_ASPath(data[:length],self._asn4))
if not self._asn4 and self.attributes.has(AttributeID.AS4_PATH):
self.__merge_attributes()
return self._AttributesFactory(data[length:])
if code == AttributeID.AS4_PATH:
logger.parser('parsing as_path')
self.attributes.add(self.__new_AS4Path(data[:length]))
if not self._asn4 and self.attributes.has(AttributeID.AS_PATH):
self.__merge_attributes()
return self._AttributesFactory(data[length:])
if code == AttributeID.NEXT_HOP:
logger.parser('parsing next-hop')
self.attributes.add(NextHop(Inet(AFI.ipv4,data[:4])))
return self._AttributesFactory(data[length:])
if code == AttributeID.MED:
logger.parser('parsing med')
self.attributes.add(MED(unpack('!L',data[:4])[0]))
return self._AttributesFactory(data[length:])
if code == AttributeID.LOCAL_PREF:
logger.parser('parsing local-preference')
self.attributes.add(LocalPreference(unpack('!L',data[:4])[0]))
return self._AttributesFactory(data[length:])
if code == AttributeID.ORIGINATOR_ID:
logger.parser('parsing originator-id')
self.attributes.add(OriginatorId.unpack(data[:4]))
return self._AttributesFactory(data[length:])
if code == AttributeID.PMSI_TUNNEL:
logger.parser('parsing pmsi-tunnel')
self.attributes.add(PMSITunnel.unpack(data[:length]))
return self._AttributesFactory(data[length:])
if code == AttributeID.ATOMIC_AGGREGATE:
logger.parser('ignoring atomic-aggregate')
return self._AttributesFactory(data[length:])
if code == AttributeID.AGGREGATOR:
logger.parser('ignoring aggregator')
return self._AttributesFactory(data[length:])
if code == AttributeID.AS4_AGGREGATOR:
logger.parser('ignoring as4_aggregator')
return self._AttributesFactory(data[length:])
if code == AttributeID.COMMUNITY:
logger.parser('parsing communities')
self.attributes.add(self.__new_communities(data[:length]))
return self._AttributesFactory(data[length:])
if code == AttributeID.EXTENDED_COMMUNITY:
logger.parser('parsing communities')
self.attributes.add(self.__new_extended_communities(data[:length]))
return self._AttributesFactory(data[length:])
if code == AttributeID.MP_UNREACH_NLRI:
logger.parser('parsing multi-protocol nlri unreacheable')
next_attributes = data[length:]
data = data[:length]
afi,safi = unpack('!HB',data[:3])
offset = 3
# See RFC 5549 for better support
if not afi in (AFI.ipv4,AFI.ipv6,AFI.l2vpn) or (not safi in (SAFI.unicast, SAFI.mpls_vpn, SAFI.rtc,SAFI.evpn)):
#self.log.out('we only understand IPv4/IPv6 and should never have received this MP_UNREACH_NLRI (%s %s)' % (afi,safi))
raise Exception("Unsupported AFI/SAFI received !! not supposed to happen here...")
return self._AttributesFactory(next_attributes)
data = data[offset:]
while data:
if safi == SAFI.unicast:
route = ReceivedRoute(BGPPrefix(afi,data),'withdraw')
elif (afi == AFI.ipv4 and safi == SAFI.mpls_vpn):
route = ReceivedRoute(VPNLabelledPrefix.unpack(afi,safi,data),'withdraw')
elif (afi == AFI.ipv4 and safi == SAFI.rtc):
route = ReceivedRoute(RouteTargetConstraint.unpack(afi,safi,data),'withdraw')
elif (afi == AFI.l2vpn and safi == SAFI.evpn):
route = ReceivedRoute(EVPNNLRI.unpack(data) ,'withdraw')
else:
raise Exception("Unsupported AFI/SAFI combination !!")
return self._AttributesFactory(next_attributes)
data = data[len(route.nlri):]
self.mp_routes.append(route)
return self._AttributesFactory(next_attributes)
if code == AttributeID.MP_REACH_NLRI:
logger.parser('parsing multi-protocol nlri reacheable')
next_attributes = data[length:]
data = data[:length]
afi,safi = unpack('!HB',data[:3])
offset = 3
if not afi in (AFI.ipv4,AFI.ipv6,AFI.l2vpn) or (not safi in (SAFI.unicast,SAFI.mpls_vpn,SAFI.rtc,SAFI.evpn)):
#self.log.out('we only understand IPv4/IPv6 and should never have received this MP_REACH_NLRI (%s %s)' % (afi,safi))
raise Exception("Unsupported AFI/SAFI received !! not supposed to happen here...")
return self._AttributesFactory(next_attributes)
len_nh = ord(data[offset])
offset += 1
if afi == AFI.ipv4 and safi in (SAFI.unicast,) and not len_nh == 4:
# We are not following RFC 4760 Section 7 (deleting route and possibly tearing down the session)
#self.log.out('bad IPv4 next-hop length (%d)' % len_nh)
return self._AttributesFactory(next_attributes)
if afi == AFI.ipv6 and safi in (SAFI.unicast,) and not len_nh in (16,32):
# We are not following RFC 4760 Section 7 (deleting route and possibly tearing down the session)
#self.log.out('bad IPv6 next-hop length (%d)' % len_nh)
return self._AttributesFactory(next_attributes)
nh = data[offset:offset+len_nh]
offset += len_nh
if len_nh == 32:
# we have a link-local address in the next-hop we ideally need to ignore
if nh[0] == chr(0xfe): nh = nh[16:]
elif nh[16] == chr(0xfe): nh = nh[:16]
# We are not following RFC 4760 Section 7 (deleting route and possibly tearing down the session)
else: return self._AttributesFactory(next_attributes)
if len_nh >= 16: nh = socket.inet_ntop(socket.AF_INET6,nh)
else:
if (safi in (SAFI.mpls_vpn,)):
# the next-hop is preceded by an rdtype and a 6-byte RD, we don't care about the RD yet
nh = socket.inet_ntop(socket.AF_INET,nh[8:])
else:
nh = socket.inet_ntop(socket.AF_INET,nh)
nb_snpa = ord(data[offset])
offset += 1
snpas = []
for _ in range(nb_snpa):
len_snpa = ord(offset)
offset += 1
snpas.append(data[offset:offset+len_snpa])
offset += len_snpa
data = data[offset:]
while data:
if safi == SAFI.unicast:
route = ReceivedRoute(BGPPrefix(afi,data),'announce')
elif (afi == AFI.ipv4 and safi == SAFI.mpls_vpn):
route = ReceivedRoute(VPNLabelledPrefix.unpack(afi,safi,data) ,'announce')
elif (afi == AFI.ipv4 and safi == SAFI.rtc):
route = ReceivedRoute(RouteTargetConstraint.unpack(afi,safi,data) ,'announce')
elif (afi == AFI.l2vpn and safi == SAFI.evpn):
route = ReceivedRoute(EVPNNLRI.unpack(data) ,'announce')
else:
raise Exception("Unsupported AFI/SAFI combination !!")
return self._AttributesFactory(next_attributes)
data = data[len(route.nlri):]
route.attributes = self.attributes
route.attributes.add(NextHop(to_IP(nh)))
self.mp_routes.append(route)
return self._AttributesFactory(next_attributes)
logger.warning("ignoring attributes of type %s %s" % (str(code),[hex(ord(_)) for _ in data]),'parsing')
return self._AttributesFactory(data[length:])
