def parse(cls, value):
try:
afi, safi = struct.unpack('!HB', value[0:3])
except Exception:
raise excep.UpdateMessageError(
sub_error=bgp_cons.ERR_MSG_UPDATE_ATTR_LEN, data='')
nlri_bin = value[3:]
# for IPv4
if afi == afn.AFNUM_INET:
# VPNv4
if safi == safn.SAFNUM_LAB_VPNUNICAST:
nlri = IPv4MPLSVPN.parse(nlri_bin, iswithdraw=True)
return dict(afi_safi=(afi, safi), withdraw=nlri)
# BGP flow spec
elif safi == safn.SAFNUM_FSPEC_RULE:
# if nlri length is greater than 240 bytes, it is encoded over 2 bytes
withdraw_list = []
while nlri_bin:
length = ord(nlri_bin[0])
if length >> 4 == 0xf and len(nlri_bin) > 2:
length = struct.unpack('!H', nlri_bin[:2])[0]
nlri_tmp = nlri_bin[2:length + 2]
nlri_bin = nlri_bin[length + 2:]
else:
nlri_tmp = nlri_bin[1:length + 1]
nlri_bin = nlri_bin[length + 1:]
nlri = IPv4FlowSpec.parse(nlri_tmp)
if nlri:
withdraw_list.append(nlri)
return dict(afi_safi=(afi, safi), withdraw=withdraw_list)
else:
return dict(afi_safi=(afn.AFNUM_INET, safi),
withdraw=repr(nlri_bin))
# for ipv6
elif afi == afn.AFNUM_INET6:
# for ipv6 unicast
if safi == safn.SAFNUM_UNICAST:
return dict(afi_safi=(afi, safi),
withdraw=IPv6Unicast.parse(nlri_data=nlri_bin))
elif safi == safn.SAFNUM_LAB_VPNUNICAST:
return dict(afi_safi=(afi, safi),
withdraw=IPv6MPLSVPN.parse(value=nlri_bin,
iswithdraw=True))
else:
return dict(afi_safi=(afi, safi), withdraw=repr(nlri_bin))
# for l2vpn
elif afi == afn.AFNUM_L2VPN:
# for evpn
if safi == safn.SAFNUM_EVPN:
return dict(afi_safi=(afi, safi),
withdraw=EVPN.parse(nlri_data=nlri_bin))
else:
return dict(afi_safi=(afi, safi), withdraw=repr(nlri_bin))
else:
return dict(afi_safi=(afi, safi), withdraw=repr(nlri_bin))
def parse(cls, value):
try:
afi, safi = struct.unpack('!HB', value[0:3])
except Exception:
raise excep.UpdateMessageError(sub_error=bgp_cons.ERR_MSG_UPDATE_ATTR_LEN,
data='')
nlri_bin = value[3:]
# for IPv4
if afi == afn.AFNUM_INET:
# VPNv4
if safi == safn.SAFNUM_LAB_VPNUNICAST:
nlri = IPv4MPLSVPN.parse(nlri_bin, iswithdraw=True)
return dict(afi_safi=(afi, safi), withdraw=nlri)
# BGP flow spec
elif safi == safn.SAFNUM_FSPEC_RULE:
# if nlri length is greater than 240 bytes, it is encoded over 2 bytes
withdraw_list = []
while nlri_bin:
length = ord(nlri_bin[0])
if length >> 4 == 0xf and len(nlri_bin) > 2:
length = struct.unpack('!H', nlri_bin[:2])[0]
nlri_tmp = nlri_bin[2: length + 2]
nlri_bin = nlri_bin[length + 2:]
else:
nlri_tmp = nlri_bin[1: length + 1]
nlri_bin = nlri_bin[length + 1:]
nlri = IPv4FlowSpec.parse(nlri_tmp)
if nlri:
withdraw_list.append(nlri)
return dict(afi_safi=(afi, safi), withdraw=withdraw_list)
else:
return dict(afi_safi=(afn.AFNUM_INET, safi), withdraw=repr(nlri_bin))
# for ipv6
elif afi == afn.AFNUM_INET6:
# for ipv6 unicast
if safi == safn.SAFNUM_UNICAST:
return dict(afi_safi=(afi, safi), withdraw=IPv6Unicast.parse(nlri_data=nlri_bin))
elif safi == safn.SAFNUM_LAB_VPNUNICAST:
return dict(afi_safi=(afi, safi), withdraw=IPv6MPLSVPN.parse(value=nlri_bin, iswithdraw=True))
else:
return dict(afi_safi=(afi, safi), withdraw=repr(nlri_bin))
# for l2vpn
elif afi == afn.AFNUM_L2VPN:
# for evpn
if safi == safn.SAFNUM_EVPN:
return dict(afi_safi=(afi, safi), withdraw=EVPN.parse(nlri_data=nlri_bin))
else:
return dict(afi_safi=(afi, safi), withdraw=repr(nlri_bin))
else:
return dict(afi_safi=(afi, safi), withdraw=repr(nlri_bin))
def test_parse_in_mul_eth_tag(self):
data_hex = b'\x03\x11\x00\x01\xac\x10\x00\x01\x17\x10\x00\x00\x00\x64\x20\xc0\xa8\x00\x01'
data_list = [{
'type': bgp_cons.BGPNLRI_EVPN_INCLUSIVE_MULTICAST_ETHERNET_TAG,
'value': {
'rd': '172.16.0.1:5904',
'eth_tag_id': 100,
'ip': '192.168.0.1'
}
}]
self.assertEqual(data_list, EVPN.parse(data_hex))
def test_parse_in_mul_eth_tag(self):
data_hex = b'\x03\x11\x00\x01\xac\x10\x00\x01\x17\x10\x00\x00\x00\x64\x20\xc0\xa8\x00\x01'
data_list = [{
'type': bgp_cons.BGPNLRI_EVPN_INCLUSIVE_MULTICAST_ETHERNET_TAG,
'value': {
'rd': '172.16.0.1:5904',
'eth_tag_id': 100,
'ip': '192.168.0.1'
}
}]
self.assertEqual(data_list, EVPN.parse(data_hex))
def test_parse_eth_segment(self):
data_hex = b'\x04\x17\x00\x01\xac\x10\x00\x01\x17\x10\x00\x00' \
b'\x00\x00\x00\x00\x00\x00\x00\x00\x20\xc0\xa8\x00\x01'
data_list = [{
'type': bgp_cons.BGPNLRI_EVPN_ETHERNET_SEGMENT,
'value': {
'rd': '172.16.0.1:5904',
'esi': 0,
'ip': '192.168.0.1'
}
}]
self.assertEqual(data_list, EVPN.parse(data_hex))
def test_parse_eth_segment(self):
data_hex = b'\x04\x17\x00\x01\xac\x10\x00\x01\x17\x10\x00\x00' \
b'\x00\x00\x00\x00\x00\x00\x00\x00\x20\xc0\xa8\x00\x01'
data_list = [{
'type': bgp_cons.BGPNLRI_EVPN_ETHERNET_SEGMENT,
'value': {
'rd': '172.16.0.1:5904',
'esi': 0,
'ip': '192.168.0.1'
}
}]
self.assertEqual(data_list, EVPN.parse(data_hex))
def test_parse_eth_auto_dis(self):
data_hex = b'\x01\x19\x00\x01\x01\x01\x01\x01\x80\x63\x00\x00\x00' \
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x64\x00\x00\xa1'
data_list = [{
'type': bgp_cons.BGPNLRI_EVPN_ETHERNET_AUTO_DISCOVERY,
'value': {
'rd': '1.1.1.1:32867',
'esi': 0,
'eth_tag_id': 100,
'label': [10]
}
}]
self.assertEqual(data_list, EVPN.parse(data_hex))
def test_parse_ip_route_prefix_v4(self):
data_hex = b'\x05\x22\x00\x02\x00\x01\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' \
b'\x00\x00\x00\x01\x18\x01\x01\x01\x00\x01\x01\x01\x01\x00\x00\xa1'
data_list = [{
'type': 5,
'value': {
'esi': 0,
'eth_tag_id': 1,
'gateway': '1.1.1.1',
'label': [10],
'prefix': '1.1.1.0/24',
'rd': '65536:2'}}]
self.assertEqual(data_list, EVPN.parse(data_hex))
def test_parse_eth_auto_dis(self):
data_hex = b'\x01\x19\x00\x01\x01\x01\x01\x01\x80\x63\x00\x00\x00' \
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x64\x00\x00\xa1'
data_list = [{
'type': bgp_cons.BGPNLRI_EVPN_ETHERNET_AUTO_DISCOVERY,
'value': {
'rd': '1.1.1.1:32867',
'esi': 0,
'eth_tag_id': 100,
'label': [10]
}
}]
self.assertEqual(data_list, EVPN.parse(data_hex))
def test_parse_mac_ip_adv(self):
data_hex = b'\x02\x25\x00\x01\xac\x11\x00\x03\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' \
b'\x00\x00\x00\x6c\x30\x00\x11\x22\x33\x44\x55\x20\x0b\x0b\x0b\x01\x00\x00\x00'
data_list = [{
'type': bgp_cons.BGPNLRI_EVPN_MAC_IP_ADVERTISEMENT,
'value': {
'rd': '172.17.0.3:2',
'mac': '00-11-22-33-44-55',
'eth_tag_id': 108,
'esi': 0,
'ip': '11.11.11.1',
'label': [0]}
}]
self.assertEqual(data_list, EVPN.parse(data_hex))
def test_parse_mac_ip_adv(self):
data_hex = b'\x02\x25\x00\x01\xac\x11\x00\x03\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' \
b'\x00\x00\x00\x6c\x30\x00\x11\x22\x33\x44\x55\x20\x0b\x0b\x0b\x01\x00\x00\x00'
data_list = [{
'type': bgp_cons.BGPNLRI_EVPN_MAC_IP_ADVERTISEMENT,
'value': {
'rd': '172.17.0.3:2',
'mac': '00-11-22-33-44-55',
'eth_tag_id': 108,
'esi': 0,
'ip': '11.11.11.1',
'label': [0]}
}]
self.assertEqual(data_list, EVPN.parse(data_hex))
def test_parse_ip_route_prefix_v6(self):
data_hex = b'\x05' \
b'\x3a' \
b'\x00\x02\x00\x01\x00\x00\x00\x02' \
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' \
b'\x00\x00\x00\x01' \
b'\x40' \
b'\x20\x01\x32\x32\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01' \
b'\x20\x01\x32\x32\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01' \
b'\x00\x00\xa1'
data_list = [{
'type': 5,
'value': {
'esi': 0,
'eth_tag_id': 1,
'gateway': '2001:3232::1',
'label': [10],
'prefix': '2001:3232::1/64',
'rd': '65536:2'}}]
self.assertEqual(data_list, EVPN.parse(data_hex))
def parse(cls, value):
try:
afi, safi, nexthop_length = struct.unpack('!HBB', value[0:4])
nexthop_bin = value[4:4 + nexthop_length]
nlri_bin = value[5 + nexthop_length:]
except Exception:
# error when lenght is wrong
raise excep.UpdateMessageError(
sub_error=bgp_cons.ERR_MSG_UPDATE_ATTR_LEN, data=repr(value))
# Address Family IPv4
if afi == afn.AFNUM_INET:
if safi == safn.SAFNUM_LAB_VPNUNICAST:
# MPLS VPN
# parse nexthop
rd_bin = nexthop_bin[0:8]
rd_type = struct.unpack('!H', rd_bin[0:2])[0]
rd_value_bin = rd_bin[2:]
if rd_type == 0:
asn, an = struct.unpack('!HI', rd_value_bin)
ipv4 = str(
netaddr.IPAddress(
int(binascii.b2a_hex(nexthop_bin[8:]), 16)))
nexthop = {'rd': '%s:%s' % (asn, an), 'str': ipv4}
# TODO(xiaoquwl) for other RD type decoding
else:
nexthop = repr(nexthop_bin[8:])
# parse nlri
nlri = IPv4MPLSVPN.parse(nlri_bin)
return dict(afi_safi=(afi, safi), nexthop=nexthop, nlri=nlri)
elif safi == safn.SAFNUM_FSPEC_RULE:
# if nlri length is greater than 240 bytes, it is encoded over 2 bytes
if len(nlri_bin) >= 240:
nlri_bin = nlri_bin[2:]
else:
nlri_bin = nlri_bin[1:]
nlri = IPv4FlowSpec.parse(nlri_bin)
return dict(afi_safi=(afi, safi),
nexthop=nexthop_bin,
nlri=nlri)
else:
nlri = repr(nlri_bin)
# # Address Family IPv6
elif afi == afn.AFNUM_INET6:
# IPv6 unicast
if safi == safn.SAFNUM_UNICAST:
# decode nexthop
# RFC 2545
# The value of the Length of Next Hop Network Address field on a
# MP_REACH_NLRI attribute shall be set to 16, when only a global
# address is present, or 32 if a link-local address is also included in
# the Next Hop field.
#
# The link-local address shall be included in the Next Hop field if and
# only if the BGP speaker shares a common subnet with the entity
# identified by the global IPv6 address carried in the Network Address
# of Next Hop field and the peer the route is being advertised to.
nexthop_addrlen = 16
has_link_local = False
nexthop = str(
netaddr.IPAddress(
int(binascii.b2a_hex(nexthop_bin[:nexthop_addrlen]),
16)))
if len(nexthop_bin) == 2 * nexthop_addrlen:
# has link local address
has_link_local = True
linklocal_nexthop = str(
netaddr.IPAddress(
int(
binascii.b2a_hex(
nexthop_bin[nexthop_addrlen:]), 16)))
nlri = IPv6Unicast.parse(nlri_bin)
if has_link_local:
return dict(afi_safi=(afi, safi),
nexthop=nexthop,
linklocal_nexthop=linklocal_nexthop,
nlri=nlri)
else:
return dict(afi_safi=(afi, safi),
nexthop=nexthop,
nlri=nlri)
elif safi == safn.SAFNUM_LAB_VPNUNICAST:
# IPv6 MPLS VPN
# parse nexthop
rd_bin = nexthop_bin[0:8]
rd_type = struct.unpack('!H', rd_bin[0:2])[0]
rd_value_bin = rd_bin[2:]
if rd_type == 0:
asn, an = struct.unpack('!HI', rd_value_bin)
ipv6 = str(
netaddr.IPAddress(
int(binascii.b2a_hex(nexthop_bin[8:]), 16)))
nexthop = {'rd': '%s:%s' % (asn, an), 'str': ipv6}
# TODO(xiaoquwl) for other RD type decoding
else:
nexthop = repr(nexthop_bin[8:])
# parse nlri
nlri = IPv6MPLSVPN.parse(nlri_bin)
return dict(afi_safi=(afi, safi), nexthop=nexthop, nlri=nlri)
else:
return dict(afi_safi=(afi, safi),
nexthop=nexthop_bin,
nlri=nlri_bin)
# for l2vpn
elif afi == afn.AFNUM_L2VPN:
if safi == safn.SAFNUM_EVPN:
nexthop = str(
netaddr.IPAddress(int(binascii.b2a_hex(nexthop_bin), 16)))
nlri = EVPN.parse(nlri_bin)
return dict(afi_safi=(afi, safi), nexthop=nexthop, nlri=nlri)
else:
nlri = repr(nlri_bin)
else:
nlri = repr(nlri_bin)
return dict(afi_safi=(afi, safi), nexthop=nexthop_bin, nlri=nlri_bin)
def parse(cls, value):
try:
afi, safi, nexthop_length = struct.unpack('!HBB', value[0:4])
nexthop_bin = value[4:4 + nexthop_length]
nlri_bin = value[5 + nexthop_length:]
except Exception:
# error when lenght is wrong
raise excep.UpdateMessageError(
sub_error=bgp_cons.ERR_MSG_UPDATE_ATTR_LEN,
data=repr(value))
# Address Family IPv4
if afi == afn.AFNUM_INET:
if safi == safn.SAFNUM_LAB_VPNUNICAST:
# MPLS VPN
# parse nexthop
rd_bin = nexthop_bin[0:8]
rd_type = struct.unpack('!H', rd_bin[0:2])[0]
rd_value_bin = rd_bin[2:]
if rd_type == 0:
asn, an = struct.unpack('!HI', rd_value_bin)
ipv4 = str(netaddr.IPAddress(int(binascii.b2a_hex(nexthop_bin[8:]), 16)))
nexthop = {'rd': '%s:%s' % (asn, an), 'str': ipv4}
# TODO(xiaoquwl) for other RD type decoding
else:
nexthop = repr(nexthop_bin[8:])
# parse nlri
nlri = IPv4MPLSVPN.parse(nlri_bin)
return dict(afi_safi=(afi, safi), nexthop=nexthop, nlri=nlri)
elif safi == safn.SAFNUM_FSPEC_RULE:
# if nlri length is greater than 240 bytes, it is encoded over 2 bytes
nlri_list = []
while nlri_bin:
length = ord(nlri_bin[0])
if length >> 4 == 0xf and len(nlri_bin) > 2:
length = struct.unpack('!H', nlri_bin[:2])[0]
nlri_tmp = nlri_bin[2: length + 2]
nlri_bin = nlri_bin[length + 2:]
else:
nlri_tmp = nlri_bin[1: length + 1]
nlri_bin = nlri_bin[length + 1:]
nlri = IPv4FlowSpec.parse(nlri_tmp)
if nlri:
nlri_list.append(nlri)
if nexthop_bin:
nexthop = str(netaddr.IPAddress(int(binascii.b2a_hex(nexthop_bin), 16)))
else:
nexthop = ''
return dict(afi_safi=(afi, safi), nexthop=nexthop, nlri=nlri_list)
else:
nlri = repr(nlri_bin)
# # Address Family IPv6
elif afi == afn.AFNUM_INET6:
# IPv6 unicast
if safi == safn.SAFNUM_UNICAST:
# decode nexthop
# RFC 2545
# The value of the Length of Next Hop Network Address field on a
# MP_REACH_NLRI attribute shall be set to 16, when only a global
# address is present, or 32 if a link-local address is also included in
# the Next Hop field.
#
# The link-local address shall be included in the Next Hop field if and
# only if the BGP speaker shares a common subnet with the entity
# identified by the global IPv6 address carried in the Network Address
# of Next Hop field and the peer the route is being advertised to.
nexthop_addrlen = 16
has_link_local = False
nexthop = str(netaddr.IPAddress(int(binascii.b2a_hex(nexthop_bin[:nexthop_addrlen]), 16)))
if len(nexthop_bin) == 2 * nexthop_addrlen:
# has link local address
has_link_local = True
linklocal_nexthop = str(netaddr.IPAddress(int(binascii.b2a_hex(nexthop_bin[nexthop_addrlen:]), 16)))
nlri = IPv6Unicast.parse(nlri_bin)
if has_link_local:
return dict(afi_safi=(afi, safi), nexthop=nexthop, linklocal_nexthop=linklocal_nexthop, nlri=nlri)
else:
return dict(afi_safi=(afi, safi), nexthop=nexthop, nlri=nlri)
elif safi == safn.SAFNUM_LAB_VPNUNICAST:
# IPv6 MPLS VPN
# parse nexthop
rd_bin = nexthop_bin[0:8]
rd_type = struct.unpack('!H', rd_bin[0:2])[0]
rd_value_bin = rd_bin[2:]
if rd_type == 0:
asn, an = struct.unpack('!HI', rd_value_bin)
ipv6 = str(netaddr.IPAddress(int(binascii.b2a_hex(nexthop_bin[8:]), 16)))
nexthop = {'rd': '%s:%s' % (asn, an), 'str': ipv6}
# TODO(xiaoquwl) for other RD type decoding
else:
nexthop = repr(nexthop_bin[8:])
# parse nlri
nlri = IPv6MPLSVPN.parse(nlri_bin)
return dict(afi_safi=(afi, safi), nexthop=nexthop, nlri=nlri)
else:
return dict(afi_safi=(afi, safi), nexthop=nexthop_bin, nlri=nlri_bin)
# for l2vpn
elif afi == afn.AFNUM_L2VPN:
if safi == safn.SAFNUM_EVPN:
nexthop = str(netaddr.IPAddress(int(binascii.b2a_hex(nexthop_bin), 16)))
nlri = EVPN.parse(nlri_bin)
return dict(afi_safi=(afi, safi), nexthop=nexthop, nlri=nlri)
else:
nlri = repr(nlri_bin)
else:
nlri = repr(nlri_bin)
return dict(afi_safi=(afi, safi), nexthop=nexthop_bin, nlri=nlri_bin)
