def unpack (cls, exdata): data = exdata # Get the data length to understand if addresses are IPv4 or IPv6 datalen = len(data) rd = RouteDistinguisher.unpack(data[:8]) data = data[8:] esi = ESI.unpack(data[:10]) data = data[10:] etag = EthernetTag.unpack(data[:4]) data = data[4:] iplen = ord(data[0]) data = data[1:] if datalen == (26 + 8): # Using IPv4 addresses ip = IP.unpack(data[:4]) data = data[4:] gwip = IP.unpack(data[:4]) data = data[4:] elif datalen == (26 + 32): # Using IPv6 addresses ip = IP.unpack(data[:16]) data = data[16:] gwip = IP.unpack(data[:16]) data = data[16:] else: raise Notify(3,5,"Data field length is given as %d, but EVPN route currently support only IPv4 or IPv6(34 or 58)" % iplen) label = Labels.unpack(data[:3]) return cls(rd,esi,etag,label,ip,iplen,gwip,exdata)
def next_hop (self, scope, name, command, tokens):
if scope[-1]['announce'][-1].attributes.has(Attribute.CODE.NEXT_HOP):
return self.error.set(self.syntax)
try:
# next-hop self is unsupported
ip = tokens.pop(0)
if ip.lower() == 'self':
if 'local-address' in scope[-1]:
la = scope[-1]['local-address']
elif self._nexthopself:
la = self._nexthopself
else:
return self.error.set('next-hop self can only be specified with a neighbor')
nh = IP.unpack(la.pack())
else:
nh = IP.create(ip)
change = scope[-1]['announce'][-1]
nlri = change.nlri
afi = nlri.afi
safi = nlri.safi
nlri.nexthop = nh
if afi == AFI.ipv4 and safi in (SAFI.unicast,SAFI.multicast):
change.attributes.add(Attribute.unpack(NextHop.ID,NextHop.FLAG,nh.packed,None))
# NextHop(nh.ip,nh.packed) does not cache the result, using unpack does
# change.attributes.add(NextHop(nh.ip,nh.packed))
return True
except Exception:
return self.error.set(self.syntax)
def test99_EVPNMACCreatePackUnpack(self):
'''Test pack/unpack for E-VPN MAC routes'''
nlri = EVPNMAC(RouteDistinguisher.fromElements("42.42.42.42", 5),
ESI(),
EthernetTag(111),
MAC("01:02:03:04:05:06"), 6*8,
Labels([42], True),
IP.create("1.1.1.1"))
packed = nlri.pack()
unpacked,leftover = EVPN.unpack_nlri(AFI(AFI.l2vpn), SAFI(SAFI.evpn),
packed, OUT.UNSET, None)
self.assertEqual(0, len(leftover))
# TODO: compare packed with a reference encoding verified
# as conformant with RFC7432
self.assertTrue(isinstance(unpacked, EVPNMAC))
self.assertEqual("42.42.42.42:5", unpacked.rd._str())
self.assertEqual(ESI.DEFAULT, unpacked.esi.esi)
self.assertEqual(EthernetTag(111), unpacked.etag)
self.assertEqual(MAC("01:02:03:04:05:06"), unpacked.mac)
self.assertEqual(IP.create("1.1.1.1"), unpacked.ip)
self.assertEqual(1, len(unpacked.label.labels))
self.assertEqual(42, unpacked.label.labels[0])
def listen_on(self, local_addr, remote_addr, port, md5_password,
md5_base64, ttl_in):
try:
if not remote_addr:
remote_addr = IP.create(
'0.0.0.0') if local_addr.ipv4() else IP.create('::')
self._listen(local_addr, remote_addr, port, md5_password,
md5_base64, ttl_in)
self.logger.debug(
'listening for BGP session(s) on %s:%d%s' %
(local_addr, port, ' with MD5' if md5_password else ''),
'network')
return True
except NetworkError as exc:
if os.geteuid() != 0 and port <= 1024:
self.logger.critical(
'can not bind to %s:%d, you may need to run ExaBGP as root'
% (local_addr, port), 'network')
else:
self.logger.critical(
'can not bind to %s:%d (%s)' %
(local_addr, port, str(exc)), 'network')
self.logger.critical(
'unset exabgp.tcp.bind if you do not want listen for incoming connections',
'network')
self.logger.critical(
'and check that no other daemon is already binding to port %d'
% port, 'network')
return False
def insert_static_route (self, scope, name, command, tokens):
try:
ip = tokens.pop(0)
except IndexError:
return self.error.set(self.syntax)
try:
ip,mask = ip.split('/')
mask = int(mask)
except ValueError:
mask = 32
try:
if 'rd' in tokens:
klass = MPLS
elif 'route-distinguisher' in tokens:
klass = MPLS
elif 'label' in tokens:
klass = MPLS
else:
klass = INET
# nexthop must be false and its str return nothing .. an empty string does that
update = Change(klass(afi=IP.toafi(ip),safi=IP.tosafi(ip),packed=IP.pton(ip),mask=mask,nexthop=None,action=OUT.ANNOUNCE),Attributes())
except ValueError:
return self.error.set(self.syntax)
if 'announce' not in scope[-1]:
scope[-1]['announce'] = []
scope[-1]['announce'].append(update)
return True
def parse_api_attribute(self, command, peers, action):
# This is a quick solution which does not support next-hop self
attribute, nlris = command.split('nlri')
route = '%s route 0.0.0.0/0 %s' % (action, ' '.join(
attribute.split()[2:]))
parsed = self.parse_api_route(route, peers, action)
if parsed in (True, False, None):
return parsed
attributes = parsed[0][1].attributes
nexthop = parsed[0][1].nlri.nexthop
changes = []
for nlri in nlris.split():
ip, mask = nlri.split('/')
klass = Prefix if 'path-information' in command else MPLS
change = Change(
klass(afi=IP.toafi(ip),
safi=IP.tosafi(ip),
packed=IP.pton(ip),
mask=int(mask),
nexthop=nexthop.packed,
action=action), attributes)
if action == 'withdraw':
change.nlri.action = OUT.withdraw
else:
change.nlri.action = OUT.announce
changes.append((peers.keys(), change))
return changes
def redirect (tokeniser):
data = tokeniser()
count = data.count(':')
if count == 0:
return IP.create(data), ExtendedCommunities().add(TrafficNextHopSimpson(False))
if count == 1:
prefix,suffix = data.split(':',1)
if prefix.count('.'):
raise ValueError('this format has been deprecated as it does not make sense and it is not supported by other vendors')
asn = int(prefix)
route_target = int(suffix)
if asn >= pow(2, 32):
raise ValueError('asn is a 32 bits number, value too large %s' % asn)
if asn >= pow(2,16):
if route_target >= pow(2, 16):
raise ValueError('asn is a 32 bits number, route target can only be 16 bit %s' % route_target)
return NoNextHop, ExtendedCommunities().add(TrafficRedirectASN4(asn, route_target))
if route_target >= pow(2,32):
raise ValueError('route target is a 32 bits number, value too large %s' % route_target)
return NoNextHop,ExtendedCommunities().add(TrafficRedirect(asn,route_target))
else:
elements = data.split(':')
ip = ':'.join(elements[:-1])
asn = int(elements[-1])
return IP.create(ip), ExtendedCommunities().add(TrafficRedirectIPv6(ip,asn))
def api_attribute (self, command, peers, action):
# This is a quick solution which does not support next-hop self
attribute,nlris = command.split('nlri')
route = '%s route 0.0.0.0/0 %s' % (action, ' '.join(attribute.split()[2:]))
parsed = self.api_route(peers,route)
if parsed in (True,False,None):
return parsed
attributes = parsed[0][1].attributes
nexthop = parsed[0][1].nlri.nexthop
changes = []
for nlri in nlris.split():
ip,mask = nlri.split('/')
klass = MPLS if 'path-information' in command else INET
change = Change(
klass(
afi=IP.toafi(ip),
safi=IP.tosafi(ip),
packed=IP.pton(ip),
mask=int(mask),
nexthop='', # could be NextHopSelf
action=action
),
attributes
)
change.nlri.nexthop = nexthop
if action == 'withdraw':
change.nlri.action = OUT.WITHDRAW
else:
change.nlri.action = OUT.ANNOUNCE
changes.append((peers.keys(),change))
return changes
def test100_EVPNMACHashEqual(self):
'''
Two indistinct EVPN NLRI should
hash to the same value, and be equal
'''
nlri1 = EVPNMAC(
RouteDistinguisher.fromElements("42.42.42.42", 5),
ESI(),
EthernetTag(111),
MAC("01:02:03:04:05:06"),
6 * 8,
Labels([42], True),
IP.create("1.1.1.1"),
)
nlri2 = EVPNMAC(
RouteDistinguisher.fromElements("42.42.42.42", 5),
ESI(),
EthernetTag(111),
MAC("01:02:03:04:05:06"),
6 * 8,
Labels([42], True),
IP.create("1.1.1.1"),
)
self.assertEqual(hash(nlri1), hash(nlri2))
self.assertEqual(nlri1, nlri2)
def test99_EVPNMACCreatePackUnpack(self):
'''Test pack/unpack for E-VPN MAC routes'''
nlri = EVPNMAC(
RouteDistinguisher.fromElements("42.42.42.42", 5),
ESI(),
EthernetTag(111),
MAC("01:02:03:04:05:06"),
6 * 8,
Labels([42], True),
IP.create("1.1.1.1"),
)
packed = nlri.pack()
unpacked, leftover = EVPN.unpack_nlri(AFI.l2vpn, SAFI.evpn, packed,
OUT.UNSET, None)
self.assertEqual(0, len(leftover))
# TODO: compare packed with a reference encoding verified
# as conformant with RFC7432
self.assertTrue(isinstance(unpacked, EVPNMAC))
self.assertEqual("42.42.42.42:5", unpacked.rd._str())
self.assertEqual(ESI.DEFAULT, unpacked.esi.esi)
self.assertEqual(EthernetTag(111), unpacked.etag)
self.assertEqual(MAC("01:02:03:04:05:06"), unpacked.mac)
self.assertEqual(IP.create("1.1.1.1"), unpacked.ip)
self.assertEqual(1, len(unpacked.label.labels))
self.assertEqual(42, unpacked.label.labels[0])
def parse_api_attribute (self,command,peers,action):
# This is a quick solution which does not support next-hop self
attribute,nlris = command.split('nlri')
route = '%s route 0.0.0.0/0 %s' % (action, ' '.join(attribute.split()[2:]))
parsed = self.parse_api_route(route,peers,action)
if parsed in (True,False,None):
return parsed
attributes = parsed[0][1].attributes
nexthop = parsed[0][1].nlri.nexthop
changes = []
for nlri in nlris.split():
ip,mask = nlri.split('/')
klass = Prefix if 'path-information' in command else MPLS
change = Change(
klass(
afi=IP.toafi(ip),
safi=IP.tosafi(ip),
packed=IP.pton(ip),
mask=int(mask),
nexthop=nexthop.packed,
action=action
)
,attributes
)
if action == 'withdraw':
change.nlri.action = OUT.withdraw
else:
change.nlri.action = OUT.announce
changes.append((peers.keys(),change))
return changes
def test99_EVPNPrefixCreatePackUnpack(self):
'''Test pack/unpack for E-VPN Prefix routes'''
nlri = EVPNPrefix(RouteDistinguisher.fromElements("42.42.42.42", 5),
ESI(),
EthernetTag(111),
Labels([42], True),
IP.create("1.1.1.0"),24,
IP.create("2.2.2.2"),
)
packed = nlri.pack()
unpacked,leftover = EVPN.unpack_nlri(AFI.l2vpn, SAFI.evpn,
packed, OUT.UNSET, None)
self.assertEqual(0, len(leftover))
# TODO: compare packed with a reference encoding verified
# as conformant with RFC7432
self.assertTrue(isinstance(unpacked, EVPNPrefix))
self.assertEqual("42.42.42.42:5", unpacked.rd._str())
self.assertEqual(ESI.DEFAULT, unpacked.esi.esi)
self.assertEqual(EthernetTag(111), unpacked.etag)
self.assertEqual(IP.create("1.1.1.0"), unpacked.ip)
self.assertEqual(24, unpacked.iplen)
self.assertEqual(IP.create("2.2.2.2"), unpacked.gwip)
self.assertEqual(1, len(unpacked.label.labels))
self.assertEqual(42, unpacked.label.labels[0])
def test3_IPVPNHashEqual(self):
'''
Two VPN NLRI distinct only by their *action* should
hash to the same value, and be equal
'''
packedPrefix, mask = prefixToPackedIPMask("1.1.1.1/32")
nlri1 = IPVPN.new(AFI(AFI.ipv4), SAFI(SAFI.mpls_vpn),
packedPrefix, mask,
Labels([42], True),
RouteDistinguisher.fromElements("42.42.42.42", 5),
IP.pton("45.45.45.45"),
OUT.ANNOUNCE)
nlri2 = IPVPN.new(AFI(AFI.ipv4), SAFI(SAFI.mpls_vpn),
packedPrefix, mask,
Labels([42], True),
RouteDistinguisher.fromElements("42.42.42.42", 5),
IP.pton("45.45.45.45"),
OUT.WITHDRAW)
self.assertEqual(hash(nlri1), hash(nlri2))
self.assertTrue(nlri1.eq(nlri2))
self.assertEqual(nlri1, nlri2)
def unpack (cls, exdata): data = exdata # Get the data length to understand if addresses are IPv4 or IPv6 datalen = len(data) rd = RouteDistinguisher.unpack(data[:8]) data = data[8:] esi = ESI.unpack(data[:10]) data = data[10:] etag = EthernetTag.unpack(data[:4]) data = data[4:] iplen = ord(data[0]) data = data[1:] if datalen == (26 + 8): # Using IPv4 addresses ip = IP.unpack(data[:4]) data = data[4:] gwip = IP.unpack(data[:4]) data = data[4:] elif datalen == (26 + 32): # Using IPv6 addresses ip = IP.unpack(data[:16]) data = data[16:] gwip = IP.unpack(data[:16]) data = data[16:] else: raise Notify(3,5,"Data field length is given as %d, but EVPN route currently support only IPv4 or IPv6(34 or 58)" % iplen) label = Labels.unpack(data[:3]) return cls(rd,esi,etag,label,ip,iplen,gwip,exdata)
def unpack (cls,data,length): if len(data) == 4: # IPv4 address terid = IP.unpack(data[:4]) elif len(data) == 16: # IPv6 terid = IP.unpack(data[:16]) return cls(terid=terid)
def inet(tokeniser):
ipmask = prefix(tokeniser)
inet = INET(afi=IP.toafi(ipmask.top()),
safi=IP.tosafi(ipmask.top()),
action=OUT.UNSET)
inet.cidr = CIDR(ipmask.ton(), ipmask.mask)
return Change(inet, Attributes())
def unpack (cls, data): if len(data) == 4: # IPv4 address addr = IP.unpack(data[:4]) elif len(data) == 16: # IPv6 addr = IP.unpack(data[:16]) return cls(iface_addr=addr)
def unpack(cls, data):
if len(data) == 4:
# IPv4 address
addr = IP.unpack(data[:4])
elif len(data) == 16:
# IPv6
addr = IP.unpack(data[:16])
return cls(iface_addr=addr)
def unpack(cls, data, length):
if len(data) == 4:
# IPv4 address
terid = IP.unpack(data[:4])
elif len(data) == 16:
# IPv6
terid = IP.unpack(data[:16])
return cls(terid=terid)
def mpls(tokeniser):
ipmask = prefix(tokeniser)
mpls = IPVPN(afi=IP.toafi(ipmask.top()),
safi=IP.tosafi(ipmask.top()),
action=OUT.ANNOUNCE)
mpls.cidr = CIDR(ipmask.ton(), ipmask.mask)
return Change(mpls, Attributes())
def unpack (cls, afi, safi, data, addpath, nexthop, action):
local_node_id = ""
local_asn = ""
local_ipv4 = ""
remote_node_id = ""
remote_asn = ""
remote_ipv4 = ""
nlri_type = data[0:2]
nlri_length, = unpack('!H',data[2:4])
protocol_id = data[4:5]
topology_type = data[5:13]
nlri_offset = 13
nlri_cur_pos = 0
while nlri_offset < nlri_length:
tlv_type, tlv_length, tlv_value = decode_tlv(data, nlri_offset, 2, 2)
if tlv_type == LSTLV.LOCAL_NODE_DESCRIPTORS:
node_length = tlv_length
node_offset = nlri_offset + 4
node_cur_pos = 0
while node_cur_pos < node_length:
node_tlv_type, node_tlv_length, node_tlv_value = decode_tlv(data, node_offset, 2, 2)
if node_tlv_type == LSTLV.IGP_ROUTER_ID:
local_node_id = str(IP.unpack(node_tlv_value))
if node_tlv_type == LSTLV.ASN:
local_asn = str(int(binascii.hexlify(node_tlv_value), 16))
node_offset = node_offset+2+2+node_tlv_length
node_cur_pos = node_cur_pos+2+2+node_tlv_length
if tlv_type == LSTLV.REMOTE_NODE_DESCRIPTORS:
node_length = tlv_length
node_offset = nlri_offset + 4
node_cur_pos = 0
while node_cur_pos < node_length:
node_tlv_type, node_tlv_length, node_tlv_value = decode_tlv(data, node_offset, 2, 2)
if node_tlv_type == LSTLV.IGP_ROUTER_ID:
print str(int(binascii.hexlify(node_tlv_value), 16))
remote_node_id = str(IP.unpack(node_tlv_value))
if node_tlv_type == LSTLV.ASN:
remote_asn = str(int(binascii.hexlify(node_tlv_value), 16))
node_offset = node_offset+2+2+node_tlv_length
node_cur_pos = node_cur_pos+2+2+node_tlv_length
if tlv_type == LSTLV.LOCAL_IPV4:
local_ipv4 = str(IP.unpack(tlv_value))
if tlv_type == LSTLV.REMOTE_IPV4:
remote_ipv4 = str(IP.unpack(tlv_value))
nlri_offset = nlri_offset+2+2+tlv_length
nlri_cur_pos = nlri_cur_pos +2+2+tlv_length
nlri = cls(local_node_id, local_asn, remote_node_id, remote_asn, local_ipv4, remote_ipv4, action)
nlri.action = action
if action == 1:
nlri.nexthop = IP.unpack(nexthop)
return len(data), nlri
def unpack(cls, data, igp):
node_type, length = unpack('!HH', data[0:4])
packed = data[:4 + length]
payload = packed[4:]
remaining = data[4 + length:]
node_id = None
dr_id = None
psn = None
# autonomous-system
if node_type == 512:
if length != 4:
raise Exception(cls._error_tlvs[node_type])
node_id = unpack('!L', payload)[0]
return cls(node_id, node_type, psn, dr_id, packed), remaining
# bgp-ls-id
if node_type == 513:
if length != 4:
raise Exception(cls._error_tlvs[node_type])
node_id = unpack('!L', payload)[0]
return cls(node_id, node_type, psn, dr_id, packed), remaining
# ospf-area-id
if node_type == 514:
if length not in (4, 16): # FIXME: it may only need to be 4
raise Exception(cls._error_tlvs[node_type])
node_id = IP.unpack(payload)
return cls(node_id, node_type, psn, dr_id, packed), remaining
# IGP Router-ID: The TLV size in combination with the protocol
# identifier enables the decoder to determine the node_typee
# of the node: sec 3.2.1.4.
if node_type == 515:
# IS-IS non-pseudonode
if igp in (1, 2):
if length not in (6, 7):
raise Exception(cls._error_tlvs[node_type])
node_id = ISO.unpack_sysid(payload),
if length == 7:
psn = unpack('!B', payload[6:7])[0]
return cls(node_id, node_type, psn, dr_id, packed), remaining
# OSPFv{2,3} non-pseudonode
if igp in (3, 5, 6, 227):
if length not in (4, 8):
raise Exception(cls._error_tlvs[node_type])
node_id = IP.unpack(payload[:4]),
if length == 8:
dr_id = IP.unpack(payload[4:8])
return cls(node_id, node_type, psn, dr_id, packed), remaining
raise Exception("unknown node descriptor sub-tlv ({}, {})".format(
f'node-type: {node_type}',
f'igp: {igp}',
))
def attributes(tokeniser):
ipmask = prefix(lambda: tokeniser.tokens[-1])
if 'rd' in tokeniser.tokens or 'route-distinguisher' in tokeniser.tokens:
nlri = IPVPN(IP.toafi(ipmask.top()), SAFI.mpls_vpn, OUT.ANNOUNCE)
elif 'label' in tokeniser.tokens:
nlri = Labelled(IP.toafi(ipmask.top()), SAFI.nlri_mpls, OUT.ANNOUNCE)
else:
nlri = INET(IP.toafi(ipmask.top()), IP.tosafi(ipmask.top()),
OUT.ANNOUNCE)
nlri.cidr = CIDR(ipmask.pack(), ipmask.mask)
change = Change(nlri, Attributes())
while True:
command = tokeniser()
if not command:
return []
if command == 'nlri':
break
action = ParseStatic.action[command]
if action == 'attribute-add':
change.attributes.add(ParseStatic.known[command](tokeniser))
elif action == 'nlri-set':
change.nlri.assign(ParseStatic.assign[command],
ParseStatic.known[command](tokeniser))
elif action == 'nexthop-and-attribute':
nexthop, attribute = ParseStatic.known[command](tokeniser)
change.nlri.nexthop = nexthop
change.attributes.add(attribute)
else:
raise ValueError('route: unknown command "%s"' % command)
attributes = change.attributes
nexthop = change.nlri.nexthop
changes = []
while True:
nlri = tokeniser.peek()
if not nlri:
break
ipmask = prefix(tokeniser)
new = Change(
change.nlri.__class__(change.nlri.afi, change.nlri.safi,
OUT.UNSET), attributes)
new.nlri.cidr = CIDR(ipmask.pack(), ipmask.mask)
new.nlri.nexthop = nexthop
changes.append(new)
return changes
def unpack (cls,data,length):
if len(data) == 4:
# IPv4 address
addr = IP.unpack(data[:4])
elif len(data) == 16:
# IPv6
addr = IP.unpack(data[:16])
else:
raise Notify(3,5, "Error parsing OSPF Forwarding Address. Wrong size")
return cls(addr=addr)
def MD5(io, ip, port, md5):
if md5:
os = platform.system()
if os == 'FreeBSD':
if md5 != 'kernel':
raise MD5Error(
'FreeBSD requires that you set your MD5 key via ipsec.conf.\n'
'Something like:\n'
'flush;\n'
'add <local ip> <peer ip> tcp 0x1000 -A tcp-md5 "password";'
)
try:
TCP_MD5SIG = 0x10
io.setsockopt(socket.IPPROTO_TCP, TCP_MD5SIG, 1)
except socket.error:
raise MD5Error(
'FreeBSD requires that you rebuild your kernel to enable TCP MD5 Signatures:\n'
'options IPSEC\n'
'options TCP_SIGNATURE\n'
'device crypto\n')
elif os == 'Linux':
try:
# __kernel_sockaddr_storage
n_af = IP.toaf(ip)
n_addr = IP.pton(ip)
n_port = socket.htons(port)
# pack 'x' is padding, so we want the struct
# Do not use '!' for the pack, the network (big) endian switch in
# struct.pack is fighting against inet_pton and htons (note the n)
if IP.toafi(ip) == AFI.ipv4:
# SS_MAXSIZE is 128 but addr_family, port and ipaddr (8 bytes total) are written independently of the padding
SS_MAXSIZE_PADDING = 128 - calcsize('HH4s') # 8
sockaddr = pack('HH4s%dx' % SS_MAXSIZE_PADDING,
socket.AF_INET, n_port, n_addr)
else:
SS_MAXSIZE_PADDING = 128 - calcsize('HI16sI') # 28
SIN6_FLOWINFO = 0
SIN6_SCOPE_ID = 0
sockaddr = pack('HHI16sI%dx' % SS_MAXSIZE_PADDING, n_af,
n_port, SIN6_FLOWINFO, n_addr,
SIN6_SCOPE_ID)
TCP_MD5SIG_MAXKEYLEN = 80
key = pack('2xH4x%ds' % TCP_MD5SIG_MAXKEYLEN, len(md5), md5)
TCP_MD5SIG = 14
io.setsockopt(socket.IPPROTO_TCP, TCP_MD5SIG, sockaddr + key)
except socket.error, exc:
raise MD5Error(
'This linux machine does not support TCP_MD5SIG, you can not use MD5 (%s)'
% errstr(exc))
else:
raise MD5Error('ExaBGP has no MD5 support for %s' % os)
def unpack(cls, data, length):
if len(data) == 4:
# IPv4 address
addr = IP.unpack(data[:4])
elif len(data) == 16:
# IPv6
addr = IP.unpack(data[:16])
else:
raise Notify(3, 5,
"Error parsing OSPF Forwarding Address. Wrong size")
return cls(addr=addr)
def prefix(tokeniser):
# XXX: could raise
ip = tokeniser()
try:
ip, mask = ip.split('/')
mask = int(mask)
except ValueError:
mask = 32
tokeniser.afi = IP.toafi(ip)
return Range(ip, IP.pton(ip), mask)
def redirect(tokeniser):
data = tokeniser()
count = data.count(':')
if count == 0:
return IP.create(data), ExtendedCommunities().add(
TrafficNextHopSimpson(False))
if count == 1:
prefix, suffix = data.split(':', 1)
if prefix.count('.'):
raise ValueError(
'this format has been deprecated as it does not make sense and it is not supported by other vendors'
)
asn = int(prefix)
route_target = int(suffix)
if asn >= pow(2, 32):
raise ValueError('asn is a 32 bits number, value too large %s' %
asn)
if asn >= pow(2, 16):
if route_target >= pow(2, 16):
raise ValueError(
'asn is a 32 bits number, route target can only be 16 bit %s'
% route_target)
return NoNextHop, ExtendedCommunities().add(
TrafficRedirectASN4(asn, route_target))
if route_target >= pow(2, 32):
raise ValueError(
'route target is a 32 bits number, value too large %s' %
route_target)
return NoNextHop, ExtendedCommunities().add(
TrafficRedirect(asn, route_target))
else:
explicit_v6 = ']:' in data
# ipv4
if not explicit_v6 and data.count(':') == 1:
return IP.create(data), ExtendedCommunities().add(
TrafficNextHopSimpson(False))
# ipv6 using []: notation
if explicit_v6:
ip, asn = data.split(']:')
ip = ip.replace('[', '', 1)
# FIXME: should this be 2^16 ??
if asn >= pow(2, 32):
raise ValueError(
'asn is a 32 bits number, value too large %s' % asn)
return IP.create(ip), ExtendedCommunities().add(
TrafficRedirectIPv6(ip, asn))
raise ValueError(
'it looks like you tried to use an IPv6 but did not enclose it in []'
)
def unpack(cls, data, igp):
dtype, dlength = unpack('!HH', data[0:4])
if dtype not in NODE_TLVS.keys():
raise Exception("Unknown Node Descriptor Sub-TLV")
# OSPF Area-ID
if dtype == 514:
return cls(node_id=IP.unpack(data[4:4 + dlength]),
dtype=dtype,
packed=data[:4 + dlength]), data[4 + dlength:]
# IGP Router-ID: The TLV size in combination with the protocol
# identifier enables the decoder to determine the type
# of the node: sec 3.2.1.4.
elif dtype == 515:
# OSPFv{2,3} non-pseudonode
if (igp == 3 or igp == 6) and dlength == 4:
r_id = IP.unpack(data[4:4 + 4])
return cls(node_id=r_id,
dtype=dtype,
packed=data[:4 + dlength]), data[4 + 4:]
# OSPFv{2,3} LAN pseudonode
if (igp == 3 or igp == 6) and dlength == 8:
r_id = IP.unpack(data[4:4 + 4])
dr_id = IP.unpack(data[8:4 + 8])
return cls(node_id=r_id,
dtype=dtype,
psn=None,
dr_id=dr_id,
packed=data[:4 + dlength]), data[4 + 8:]
# IS-IS non-pseudonode
if (igp == 1 or igp == 2) and dlength == 6:
return cls(node_id=ISO.unpack_sysid(data[4:4 + 6]),
dtype=dtype,
packed=data[:4 + dlength]), data[4 + 6:]
# IS-IS LAN pseudonode = ISO Node-ID + PSN
# Unpack ISO address
if (igp == 1 or igp == 2) and dlength == 7:
iso_node = ISO.unpack_sysid(data[4:4 + 6])
psn = unpack('!B', data[4 + 6:4 + 7])[0]
return cls(node_id=iso_node,
dtype=dtype,
psn=psn,
packed=data[:4 + dlength]), data[4 + 7:]
elif dtype == 512 and dlength == 4:
# ASN
return cls(node_id=unpack('!L', data[4:4 + dlength])[0],
dtype=dtype,
packed=data[:4 + dlength]), data[4 + 4:]
elif dtype == 513 and dlength == 4:
# BGP-LS
return cls(node_id=unpack('!L', data[4:4 + dlength])[0],
dtype=dtype,
packed=data[:4 + dlength]), data[4 + 4:]
else:
raise Notify(3, 5, 'could not decode Local Node descriptor')
def prefix (tokeniser):
# XXX: could raise
ip = tokeniser()
try:
ip,mask = ip.split('/')
mask = int(mask)
except ValueError:
mask = 32
tokeniser.afi = IP.toafi(ip)
return Range(ip,IP.pton(ip),mask)
def route (tokeniser):
action = OUT.ANNOUNCE if tokeniser.announce else OUT.WITHDRAW
ipmask = prefix(tokeniser)
check = lambda change,afi: True
if 'rd' in tokeniser.tokens or 'route-distinguisher' in tokeniser.tokens:
nlri = IPVPN(IP.toafi(ipmask.top()),SAFI.mpls_vpn,action)
check = AnnounceVPN.check
elif 'label' in tokeniser.tokens:
nlri = Label(IP.toafi(ipmask.top()),SAFI.nlri_mpls,action)
check = AnnounceLabel.check
else:
nlri = INET(IP.toafi(ipmask.top()), IP.tosafi(ipmask.top()), action)
check = AnnouncePath.check
nlri.cidr = CIDR(ipmask.pack(),ipmask.mask)
change = Change(
nlri,
Attributes()
)
while True:
command = tokeniser()
if not command:
break
if command == 'label':
nlri.labels = label(tokeniser)
continue
if command == 'rd' or command == 'route-distinguisher':
nlri.rd = route_distinguisher(tokeniser)
continue
action = ParseStatic.action.get(command,'')
if action == 'attribute-add':
change.attributes.add(ParseStatic.known[command](tokeniser))
elif action == 'nlri-set':
change.nlri.assign(ParseStatic.assign[command],ParseStatic.known[command](tokeniser))
elif action == 'nexthop-and-attribute':
nexthop,attribute = ParseStatic.known[command](tokeniser)
change.nlri.nexthop = nexthop
change.attributes.add(attribute)
else:
raise ValueError('unknown command "%s"' % command)
if not check(change,nlri.afi):
raise ValueError('invalid route (missing next-hop, label or rd ?)')
return list(ParseStatic.split(change))
def destination(tokeniser):
data = tokeniser()
if data.count('.') == 3 and data.count(':') == 0:
ip, netmask = data.split('/')
raw = b''.join(bytes([int(_)]) for _ in ip.split('.'))
yield Flow4Destination(raw, int(netmask))
elif data.count('/') == 1:
ip, netmask = data.split('/')
offset = 0
yield Flow6Destination(IP.pton(ip), int(netmask), int(offset))
else:
ip, netmask, offset = data.split('/')
yield Flow6Destination(IP.pton(ip), int(netmask), int(offset))
def inet (tokeniser): ipmask = prefix(tokeniser) inet = INET( afi=IP.toafi(ipmask.top()), safi=IP.tosafi(ipmask.top()), action=OUT.UNSET ) inet.cidr = CIDR(ipmask.ton(),ipmask.mask) return Change( inet, Attributes() )
def mpls (tokeniser): ipmask = prefix(tokeniser) mpls = IPVPN( afi=IP.toafi(ipmask.top()), safi=IP.tosafi(ipmask.top()), action=OUT.UNSET ) mpls.cidr = CIDR(ipmask.ton(),ipmask.mask) return Change( mpls, Attributes() )
def destination(tokeniser):
data = tokeniser()
if data.count('.') == 3 and data.count(':') == 0:
ip, netmask = data.split('/')
raw = concat_bytes_i(character(int(_)) for _ in ip.split('.'))
yield Flow4Destination(raw, int(netmask))
elif data.count('/') == 1:
ip, netmask = data.split('/')
offset = 0
yield Flow6Destination(IP.pton(ip), int(netmask), int(offset))
else:
ip, netmask, offset = data.split('/')
yield Flow6Destination(IP.pton(ip), int(netmask), int(offset))
def source(tokeniser):
data = tokeniser()
if data.count('.') == 3 and data.count(':') == 0:
ip, netmask = data.split('/')
raw = ''.join(chr(int(_)) for _ in ip.split('.'))
yield Flow4Source(raw, int(netmask))
elif data.count('/') == 1:
ip, netmask = data.split('/')
offset = 0
yield Flow6Source(IP.pton(ip), int(netmask), int(offset))
else:
ip, netmask, offset = data.split('/')
yield Flow6Source(IP.pton(ip), int(netmask), int(offset))
def inet (tokeniser): ipmask = prefix(tokeniser) return Change( INET( afi=IP.toafi(ipmask.string), safi=IP.tosafi(ipmask.string), packed=IP.pton(ipmask.string), mask=ipmask.mask, nexthop=None, action=OUT.UNSET ), Attributes() )
def destination (tokeniser):
data = tokeniser()
if data.count('.') == 3 and data.count(':') == 0:
ip,netmask = data.split('/')
raw = concat_bytes_i(character(int(_)) for _ in ip.split('.'))
yield Flow4Destination(raw,int(netmask))
elif data.count('/') == 1:
ip,netmask = data.split('/')
offset = 0
yield Flow6Destination(IP.pton(ip),int(netmask),int(offset))
else:
ip,netmask,offset = data.split('/')
yield Flow6Destination(IP.pton(ip),int(netmask),int(offset))
def listen_on (self, local_addr, remote_addr, port, md5_password, md5_base64, ttl_in):
try:
if not remote_addr:
remote_addr = IP.create('0.0.0.0') if local_addr.ipv4() else IP.create('::')
self._listen(local_addr, remote_addr, port, md5_password, md5_base64, ttl_in)
self.logger.debug('listening for BGP session(s) on %s:%d%s' % (local_addr, port,' with MD5' if md5_password else ''),'network')
return True
except NetworkError as exc:
if os.geteuid() != 0 and port <= 1024:
self.logger.critical('can not bind to %s:%d, you may need to run ExaBGP as root' % (local_addr, port),'network')
else:
self.logger.critical('can not bind to %s:%d (%s)' % (local_addr, port,str(exc)),'network')
self.logger.critical('unset exabgp.tcp.bind if you do not want listen for incoming connections','network')
self.logger.critical('and check that no other daemon is already binding to port %d' % port,'network')
return False
def test101_EVPNHashEqual_somefieldsvary(self):
'''
Two EVPN MAC NLRIs differing by their ESI or label or RD,
or nexthop, but otherwise identical should hash to the same value,
and be equal
'''
nlri0 = EVPNMAC(RouteDistinguisher.fromElements("42.42.42.42",
5), ESI(),
EthernetTag(111), MAC("01:02:03:04:05:06"), 6 * 8,
Labels([42], True), IP.create("1.1.1.1"))
# Esi
nlri1 = EVPNMAC(RouteDistinguisher.fromElements("42.42.42.42", 5),
ESI(['1' for _ in range(0, 10)]), EthernetTag(111),
MAC("01:02:03:04:05:06"), 6 * 8, Labels([42], True),
IP.create("1.1.1.1"))
# label
nlri2 = EVPNMAC(RouteDistinguisher.fromElements("42.42.42.42",
5), ESI(),
EthernetTag(111), MAC("01:02:03:04:05:06"), 6 * 8,
Labels([4444], True), IP.create("1.1.1.1"))
# IP: different IPs, but same MACs: different route
nlri3 = EVPNMAC(RouteDistinguisher.fromElements("42.42.42.42",
5), ESI(),
EthernetTag(111), MAC("01:02:03:04:05:06"), 6 * 8,
Labels([42], True), IP.create("2.2.2.2"))
# with a next hop...
nlri4 = EVPNMAC(RouteDistinguisher.fromElements("42.42.42.42",
5), ESI(),
EthernetTag(111), MAC("01:02:03:04:05:06"), 6 * 8,
Labels([42], True), IP.create("1.1.1.1"),
IP.pton("10.10.10.10"))
nlri5 = EVPNMAC(RouteDistinguisher.fromElements("42.42.42.42",
5), ESI(),
EthernetTag(111), MAC("01:02:03:04:05:06"), 6 * 8,
Labels([42], True), IP.create("1.1.1.1"),
IP.pton("11.11.11.11"))
self.assertEqual(hash(nlri0), hash(nlri1))
self.assertEqual(hash(nlri0), hash(nlri2))
self.assertEqual(hash(nlri0), hash(nlri4))
self.assertEqual(nlri0, nlri1)
self.assertEqual(nlri0, nlri2)
self.assertEqual(nlri0, nlri4)
self.assertEqual(nlri1, nlri2)
self.assertEqual(nlri1, nlri4)
self.assertEqual(nlri2, nlri4)
self.assertEqual(nlri4, nlri5)
self.assertNotEqual(hash(nlri0), hash(nlri3))
self.assertNotEqual(nlri0, nlri3)
self.assertNotEqual(nlri1, nlri3)
self.assertNotEqual(nlri2, nlri3)
self.assertNotEqual(nlri3, nlri4)
def unpack(cls, data):
length = len(data)
if length not in (4, 16):
raise Notify(3, 5, "Invalid remote-te size")
return cls([str(IP.unpack(data))])
def connect(self):
# allows to test the protocol code using modified StringIO with a extra 'pending' function
if not self.connection:
local = self.neighbor.md5_ip.top(
) if not self.neighbor.auto_discovery else None
peer = self.neighbor.peer_address.top()
afi = self.neighbor.peer_address.afi
md5 = self.neighbor.md5_password
md5_base64 = self.neighbor.md5_base64
ttl_out = self.neighbor.ttl_out
self.connection = Outgoing(afi, peer, local, self.port, md5,
md5_base64, ttl_out)
if not local and self.connection.init:
self.neighbor.local_address = IP.create(self.connection.local)
if self.neighbor.router_id is None and self.neighbor.local_address.afi == AFI.ipv4:
self.neighbor.router_id = self.neighbor.local_address
try:
generator = self.connection.establish()
while True:
connected = six.next(generator)
if not connected:
yield False
continue
if self.peer.neighbor.api['neighbor-changes']:
self.peer.reactor.processes.connected(
self.peer.neighbor)
yield True
return
except StopIteration:
# close called by the caller
# self.close('could not connect to remote end')
yield False
return
def connect(self):
# allows to test the protocol code using modified StringIO with a extra 'pending' function
if self.connection:
return
local = self.neighbor['md5-ip'].top(
) if not self.neighbor.auto_discovery else None
peer = self.neighbor['peer-address'].top()
afi = self.neighbor['peer-address'].afi
md5 = self.neighbor['md5-password']
md5_base64 = self.neighbor['md5-base64']
ttl_out = self.neighbor['outgoing-ttl']
self.connection = Outgoing(afi, peer, local, self.port, md5,
md5_base64, ttl_out)
for connected in self.connection.establish():
yield False
if self.peer.neighbor.api['neighbor-changes']:
self.peer.reactor.processes.connected(self.peer.neighbor)
if not local:
self.neighbor['local-address'] = IP.create(self.connection.local)
if self.neighbor['router-id'] is None and self.neighbor[
'local-address'].afi == AFI.ipv4:
self.neighbor['router-id'] = self.neighbor['local-address']
yield True
def connect (self): # allows to test the protocol code using modified StringIO with a extra 'pending' function if not self.connection: local = self.neighbor.md5_ip.top() if not self.neighbor.auto_discovery else None peer = self.neighbor.peer_address.top() afi = self.neighbor.peer_address.afi md5 = self.neighbor.md5_password md5_base64 = self.neighbor.md5_base64 ttl_out = self.neighbor.ttl_out self.connection = Outgoing(afi,peer,local,self.port,md5,md5_base64,ttl_out) if not self.connection.init: yield False return if not local: self.neighbor.local_address = IP.create(self.connection.local) if self.neighbor.router_id is None and self.neighbor.local_address.afi == AFI.ipv4: self.neighbor.router_id = self.neighbor.local_address for connected in self.connection.establish(): if not connected: yield False continue if self.peer.neighbor.api['neighbor-changes']: self.peer.reactor.processes.connected(self.peer.neighbor) yield True return
def redirect (self, scope, name, command, tokens):
try:
if tokens[0].count(':') == 1:
prefix,suffix = tokens[0].split(':',1)
if prefix.count('.'):
raise ValueError('this format has been deprecaded as it does not make sense and it is not supported by other vendors')
else:
asn = int(prefix)
route_target = int(suffix)
if asn >= pow(2,16):
raise ValueError('asn is a 32 bits number, it can only be 16 bit %s' % route_target)
if route_target >= pow(2,32):
raise ValueError('route target is a 32 bits number, value too large %s' % route_target)
scope[-1]['announce'][-1].attributes[Attribute.CODE.EXTENDED_COMMUNITY].add(TrafficRedirect(asn,route_target))
return True
else:
change = scope[-1]['announce'][-1]
if change.nlri.nexthop is not NoNextHop:
return self.error.set(self.syntax)
nh = IP.create(tokens.pop(0))
change.nlri.nexthop = nh
change.attributes[Attribute.CODE.EXTENDED_COMMUNITY].add(TrafficNextHop(False))
return True
except (IndexError,ValueError):
return self.error.set(self.syntax)
def _multi_neighbor (self, scope, tokens):
if len(tokens) != 1:
return self.error.set('syntax: neighbor <ip> { <options> }')
address = tokens[0]
scope.append({})
try:
scope[-1]['peer-address'] = IP.create(address)
except (IndexError,ValueError,socket.error):
return self.error.set('"%s" is not a valid IP address' % address)
while True:
r = self._dispatch(
scope,'neighbor',
[
'static','flow','l2vpn',
'process','family','capability','operational'
],
[
'description','router-id','local-address','local-as','peer-as',
'host-name','domain-name',
'passive','listen','hold-time','add-path','graceful-restart','md5',
'ttl-security','multi-session','group-updates','asn4','aigp',
'auto-flush','adj-rib-out'
]
)
# XXX: THIS SHOULD ALLOW CAPABILITY AND NOT THE INDIVIDUAL SUB KEYS
if r is False:
return False
if r is None:
return True
def test200_IPVPNCreatePackUnpack(self):
'''Test pack/unpack for IPVPN routes'''
nlri = IPVPN.new(
AFI.ipv4,
SAFI.mpls_vpn,
IP.pton("1.2.3.0"),
24,
Labels([42], True),
RouteDistinguisher.fromElements("42.42.42.42", 5),
)
packed = nlri.pack()
unpacked, leftover = IPVPN.unpack_nlri(AFI.ipv4, SAFI.mpls_vpn, packed,
OUT.UNSET, None)
self.assertEqual(0, len(leftover))
# TODO: compare packed with a reference encoding verified
# as conformant with RFC4364
self.assertTrue(isinstance(unpacked, IPVPN))
self.assertEqual("1.2.3.0/24", unpacked.cidr.prefix())
self.assertEqual(1, len(unpacked.labels.labels))
self.assertEqual(42, unpacked.labels.labels[0])
self.assertEqual("42.42.42.42:5", unpacked.rd._str())
def _multi_neighbor (self, scope, name, command, tokens):
if len(tokens) != 1:
return self.error.set('syntax: neighbor <ip> { <options> }')
address = tokens[0]
scope.append({})
try:
scope[-1]['peer-address'] = IP.create(address)
except (IndexError,ValueError,socket.error):
return self.error.set('"%s" is not a valid IP address' % address)
while True:
r = self._dispatch(
scope,name,'neighbor',
[
'static','flow','l2vpn',
'process','family','capability','operational'
],
self._command['neighbor']
)
# XXX: THIS SHOULD ALLOW CAPABILITY AND NOT THE INDIVIDUAL SUB KEYS
if r is False:
return False
if r is None:
return True
def __init__(self,afi,safi,packed,mask,nexthop,action): self.labels = Labels.NOLABEL self.rd = RouteDistinguisher.NORD self.nexthop = IP.unpack(nexthop) if nexthop else NoIP self.action = action NLRI.__init__(self,afi,safi) CIDR.__init__(self,packed,mask)
def unpack(cls, data, length):
size = len(data)
if size not in (4, 16):
raise Notify(3, 5, "Invalid remote-te size")
return cls([str(IP.unpack(data[:size]))])
def __init__ (self, afi=AFI.ipv4,safi=SAFI.flow_ip,nexthop=None,rd=None):
NLRI.__init__(self,afi,safi)
self.rules = {}
self.action = OUT.UNSET
self.nexthop = IP.unpack(nexthop) if nexthop else NoNextHop
self.rd = rd if rd else RouteDistinguisher.NORD
self.unique = unique.next()
def connect (self):
# allows to test the protocol code using modified StringIO with a extra 'pending' function
if not self.connection:
local = self.neighbor.md5_ip.top() if not self.neighbor.auto_discovery else None
peer = self.neighbor.peer_address.top()
afi = self.neighbor.peer_address.afi
md5 = self.neighbor.md5_password
md5_base64 = self.neighbor.md5_base64
ttl_out = self.neighbor.ttl_out
self.connection = Outgoing(afi,peer,local,self.port,md5,md5_base64,ttl_out)
if not local and self.connection.init:
self.neighbor.local_address = IP.create(self.connection.local)
if self.neighbor.router_id is None and self.neighbor.local_address.afi == AFI.ipv4:
self.neighbor.router_id = self.neighbor.local_address
try:
generator = self.connection.establish()
while True:
connected = six.next(generator)
if not connected:
yield False
continue
if self.peer.neighbor.api['neighbor-changes']:
self.peer.reactor.processes.connected(self.peer.neighbor)
yield True
return
except StopIteration:
# close called by the caller
# self.close('could not connect to remote end')
yield False
return
def unpack (cls, data): datalen = len(data) rd = RouteDistinguisher.unpack(data[:8]) esi = ESI.unpack(data[8:18]) etag = EthernetTag.unpack(data[18:22]) maclength = ord(data[22]) if (maclength > 48 or maclength < 0): raise Notify(3,5,'invalid MAC Address length in %s' % cls.NAME) end = 23 + 6 # MAC length MUST be 6 mac = MACQUAL.unpack(data[23:end]) length = ord(data[end]) iplen = length / 8 if datalen in [36,39]: # No IP information (1 or 2 labels) iplenUnpack = 0 if iplen != 0: raise Notify(3,5,"IP length is given as %d, but current MAC route has no IP information" % iplen) elif datalen in [40, 43]: # Using IPv4 addresses (1 or 2 labels) iplenUnpack = 4 if (iplen > 32 or iplen < 0): raise Notify(3,5,"IP field length is given as %d, but current MAC route is IPv4 and valus is out of range" % iplen) elif datalen in [52, 55]: # Using IPv6 addresses (1 or 2 labels) iplenUnpack = 16 if (iplen > 128 or iplen < 0): raise Notify(3,5,"IP field length is given as %d, but current MAC route is IPv6 and valus is out of range" % iplen) else: raise Notify(3,5,"Data field length is given as %d, but does not match one of the expected lengths" % datalen) ip = IP.unpack(data[end+1:end+1+iplenUnpack]) label = Labels.unpack(data[end+1+iplenUnpack:end+1+iplenUnpack+3]) return cls(rd,esi,etag,mac,maclength,label,ip,data)
def connect(self):
# allows to test the protocol code using modified StringIO with a extra 'pending' function
if not self.connection:
local = self.neighbor.md5_ip.top(
) if not self.neighbor.auto_discovery else None
peer = self.neighbor.peer_address.top()
afi = self.neighbor.peer_address.afi
md5 = self.neighbor.md5_password
md5_base64 = self.neighbor.md5_base64
ttl_out = self.neighbor.ttl_out
self.connection = Outgoing(afi, peer, local, self.port, md5,
md5_base64, ttl_out)
if not self.connection.init:
yield False
return
if not local:
self.neighbor.local_address = IP.create(self.connection.local)
if self.neighbor.router_id is None and self.neighbor.local_address.afi == AFI.ipv4:
self.neighbor.router_id = self.neighbor.local_address
for connected in self.connection.establish():
if not connected:
yield False
continue
if self.peer.neighbor.api['neighbor-changes']:
self.peer.reactor.processes.connected(self.peer.neighbor)
yield True
return
def __init__ (self,afi=AFI.ipv4,safi=SAFI.flow_ip,nexthop=None,rd=None):
NLRI.__init__(self,afi,safi)
self.rules = {}
self.action = OUT.announce
self.nexthop = IP.unpack(nexthop) if nexthop else NoIP
self.rd = rd
self.unique = unique.next()
def __init__(self, afi=AFI.ipv4, safi=SAFI.flow_ip, nexthop=None, rd=None):
NLRI.__init__(self, afi, safi)
self.rules = {}
self.action = OUT.ANNOUNCE
self.nexthop = IP.unpack(nexthop) if nexthop else NoIP
self.rd = rd
self.unique = unique.next()
def __init__ (self, afi, safi, packed, mask, nexthop, action,path=None): self.path_info = PathInfo.NOPATH if path is None else path self.labels = Labels.NOLABEL self.rd = RouteDistinguisher.NORD self.nexthop = IP.unpack(nexthop) if nexthop else NoNextHop self.action = action NLRI.__init__(self,afi,safi) CIDR.__init__(self,packed,mask)
def route (tokeniser):
ipmask = prefix(tokeniser)
if 'rd' in tokeniser.tokens or 'route-distinguisher' in tokeniser.tokens:
klass = MPLS
safi = SAFI(SAFI.mpls_vpn)
elif 'label' in tokeniser.tokens:
# XXX: should we create a LABEL class ?
klass = MPLS
safi = SAFI(SAFI.nlri_mpls)
else:
klass = INET
safi = IP.tosafi(ipmask.string)
change = Change(
klass(
IP.toafi(ipmask.string),
safi,
ipmask.pack(),
ipmask.mask,
'',
OUT.UNSET
),
Attributes()
)
while True:
command = tokeniser()
if not command:
break
action = ParseStatic.action[command]
if action == 'attribute-add':
change.attributes.add(ParseStatic.known[command](tokeniser))
elif action == 'nlri-set':
change.nlri.assign(ParseStatic.assign[command],ParseStatic.known[command](tokeniser))
elif action == 'nexthop-and-attribute':
nexthop,attribute = ParseStatic.known[command](tokeniser)
change.nlri.nexthop = nexthop
change.attributes.add(attribute)
else:
raise ValueError('route: unknown command "%s"' % command)
return list(ParseStatic.split(change))
def ip (self, scope, command, tokens):
try:
ip = IP.create(tokens[0])
except (IndexError,ValueError):
return self.error.set('"%s" is an invalid IP address' % ' '.join(tokens))
scope[-1][command] = ip
return True
