def construct(cls, value):
"""Construct a attribute
:param value: python dictionary
{'afi_safi': (1,128),
'nexthop': {},
'nlri': []
"""
afi, safi = value['afi_safi']
if afi == afn.AFNUM_INET:
if safi == safn.SAFNUM_LAB_VPNUNICAST: # MPLS VPN
pass
elif safi == safn.SAFNUM_FSPEC_RULE: # BGP Flow spec
try:
try:
nexthop = netaddr.IPAddress(value['nexthop']).packed
except netaddr.core.AddrFormatError:
nexthop = ''
nlri = IPv4FlowSpec.construct(value=value['nlri'])
if nlri:
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + \
struct.pack('!B', len(nexthop)) + nexthop + b'\x00' + nlri
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
except Exception as e:
raise excep.ConstructAttributeFailed(
reason='failed to construct attributes: %s' % e,
data=value
)
else:
raise excep.ConstructAttributeFailed(
reason='unsupport this sub address family',
data=value)
# ipv6 unicast
elif afi == afn.AFNUM_INET6:
if safi == safn.SAFNUM_UNICAST:
nexthop_len = 16
nexthop_bin = netaddr.IPAddress(value['nexthop']).packed
if value.get('linklocal_nexthop'):
nexthop_len *= 2
nexthop_bin += netaddr.IPAddress(value['linklocal_nexthop']).packed
nlri_bin = IPv6Unicast.construct(nlri_list=value['nlri'])
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + struct.pack('!B', nexthop_len) + \
nexthop_bin + b'\x00' + nlri_bin
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID)\
+ struct.pack('!B', len(attr_value)) + attr_value
else:
raise excep.ConstructAttributeFailed(
reason='unsupport this sub address family',
data=value)
def construct(cls, value):
"""Construct a attribute
:param value: python dictionary
{'afi_safi': (1,128),
'nexthop': {},
'nlri': []
"""
afi, safi = value['afi_safi']
if afi == afn.AFNUM_INET:
if safi == safn.SAFNUM_LAB_VPNUNICAST: # MPLS VPN
nexthop_hex = cls.construct_mpls_vpn_nexthop(value['nexthop'])
nlri_hex = IPv4MPLSVPN.construct(value['nlri'])
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) +\
struct.pack('!B', len(nexthop_hex)) + nexthop_hex + b'\x00' + nlri_hex
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
elif safi == safn.SAFNUM_FSPEC_RULE: # BGP Flow spec
try:
try:
nexthop = netaddr.IPAddress(value['nexthop']).packed
except netaddr.core.AddrFormatError:
nexthop = ''
nlri = IPv4FlowSpec.construct(value=value['nlri'])
if nlri:
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + \
struct.pack('!B', len(nexthop)) + nexthop + b'\x00' + nlri
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
except Exception as e:
raise excep.ConstructAttributeFailed(
reason='failed to construct attributes: %s' % e,
data=value)
else:
raise excep.ConstructAttributeFailed(
reason='unsupport this sub address family', data=value)
# ipv6 unicast
elif afi == afn.AFNUM_INET6:
if safi == safn.SAFNUM_LAB_VPNUNICAST: # MPLS VPN
nexthop_hex = cls.construct_mpls_vpn_nexthop(value['nexthop'])
nlri_hex = IPv6MPLSVPN.construct(value['nlri'])
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) +\
struct.pack('!B', len(nexthop_hex)) + nexthop_hex + b'\x00' + nlri_hex
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
elif safi == safn.SAFNUM_UNICAST:
nexthop_len = 16
nexthop_bin = netaddr.IPAddress(value['nexthop']).packed
if value.get('linklocal_nexthop'):
nexthop_len *= 2
nexthop_bin += netaddr.IPAddress(
value['linklocal_nexthop']).packed
nlri_bin = IPv6Unicast.construct(nlri_list=value['nlri'])
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + struct.pack('!B', nexthop_len) + \
nexthop_bin + b'\x00' + nlri_bin
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID)\
+ struct.pack('!B', len(attr_value)) + attr_value
# for l2vpn
elif afi == afn.AFNUM_L2VPN:
if safi == safn.SAFNUM_EVPN:
nexthop_bin = netaddr.IPAddress(value['nexthop']).packed
nlri_bin = EVPN.construct(nlri_list=value['nlri'])
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + struct.pack('!B', len(nexthop_bin)) + \
nexthop_bin + b'\x00' + nlri_bin
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID)\
+ struct.pack('!B', len(attr_value)) + attr_value
else:
raise excep.ConstructAttributeFailed(
reason='unsupport this sub address family', data=value)
def construct(cls, value):
"""Construct a attribute
:param value: python dictionary
{'afi_safi': (1,128),
'withdraw': []
"""
afi, safi = value['afi_safi']
if afi == afn.AFNUM_INET:
if safi == safn.SAFNUM_LAB_VPNUNICAST: # MPLS VPN
nlri = IPv4MPLSVPN.construct(value['withdraw'], iswithdraw=True)
if nlri:
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + nlri
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
else:
return None
elif safi == safn.SAFNUM_FSPEC_RULE:
try:
nlri_list = value.get('withdraw') or []
if not nlri_list:
return None
nlri_hex = b''
for nlri in nlri_list:
nlri_hex += IPv4FlowSpec.construct(value=nlri)
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + nlri_hex
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
except Exception:
raise excep.ConstructAttributeFailed(
reason='failed to construct attributes',
data=value
)
else:
raise excep.ConstructAttributeFailed(
reason='unsupport this sub address family',
data=value)
elif afi == afn.AFNUM_INET6:
if safi == safn.SAFNUM_UNICAST:
nlri = IPv6Unicast.construct(nlri_list=value['withdraw'])
if nlri:
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + nlri
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
elif safi == safn.SAFNUM_LAB_VPNUNICAST:
nlri = IPv6MPLSVPN.construct(value=value['withdraw'], iswithdraw=True)
if nlri:
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + nlri
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
else:
return None
# for l2vpn
elif afi == afn.AFNUM_L2VPN:
# for evpn
if safi == safn.SAFNUM_EVPN:
nlri = EVPN.construct(nlri_list=value['withdraw'])
if nlri:
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + nlri
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
else:
return None
else:
raise excep.ConstructAttributeFailed(
reason='unsupport this sub address family',
data=value)
def construct(cls, value):
"""Construct a attribute
:param value: python dictionary
{'afi_safi': (1,128),
'withdraw': []
"""
afi, safi = value['afi_safi']
if afi == afn.AFNUM_INET:
if safi == safn.SAFNUM_LAB_VPNUNICAST: # MPLS VPN
nlri = IPv4MPLSVPN.construct(value['withdraw'], iswithdraw=True)
if nlri:
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + nlri
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
else:
return None
elif safi == safn.SAFNUM_FSPEC_RULE:
try:
nlri_list = value.get('withdraw') or []
if not nlri_list:
return None
nlri_hex = b''
for nlri in nlri_list:
nlri_hex += IPv4FlowSpec.construct(value=nlri)
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + nlri_hex
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
except Exception:
raise excep.ConstructAttributeFailed(
reason='failed to construct attributes',
data=value
)
else:
raise excep.ConstructAttributeFailed(
reason='unsupport this sub address family',
data=value)
elif afi == afn.AFNUM_INET6:
if safi == safn.SAFNUM_UNICAST:
nlri = IPv6Unicast.construct(nlri_list=value['withdraw'])
if nlri:
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + nlri
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
elif safi == safn.SAFNUM_LAB_VPNUNICAST:
nlri = IPv6MPLSVPN.construct(value=value['withdraw'], iswithdraw=True)
if nlri:
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + nlri
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
else:
return None
# for l2vpn
elif afi == afn.AFNUM_L2VPN:
# for evpn
if safi == safn.SAFNUM_EVPN:
nlri = EVPN.construct(nlri_list=value['withdraw'])
if nlri:
attr_value = struct.pack('!H', afi) + struct.pack('!B', safi) + nlri
return struct.pack('!B', cls.FLAG) + struct.pack('!B', cls.ID) \
+ struct.pack('!B', len(attr_value)) + attr_value
else:
return None
else:
raise excep.ConstructAttributeFailed(
reason='unsupport this sub address family',
data=value)
