def str_to_bin_for_rt(route_target):
rt = route_target.split(":")
as_number = int(rt[0])
local_administrator = int(rt[1])
rt_tmp = BGPTwoOctetAsSpecificExtendedCommunity(subtype=2, as_number=as_number, local_administrator=local_administrator)
bin_rt = rt_tmp.serialize()
return bin_rt
def create_rt_extended_community(value, subtype=2):
"""
Creates an instance of the BGP Route Target Community (if "subtype=2")
or Route Origin Community ("subtype=3").
:param value: String of Route Target or Route Origin value.
:param subtype: Subtype of Extended Community.
:return: An instance of Route Target or Route Origin Community.
"""
global_admin, local_admin = value.split(':')
local_admin = int(local_admin)
if global_admin.isdigit() and 0 <= int(global_admin) <= 0xffff:
ext_com = BGPTwoOctetAsSpecificExtendedCommunity(
subtype=subtype,
as_number=int(global_admin),
local_administrator=local_admin)
elif global_admin.isdigit() and 0xffff < int(global_admin) <= 0xffffffff:
ext_com = BGPFourOctetAsSpecificExtendedCommunity(
subtype=subtype,
as_number=int(global_admin),
local_administrator=local_admin)
elif ip.valid_ipv4(global_admin):
ext_com = BGPIPv4AddressSpecificExtendedCommunity(
subtype=subtype,
ipv4_address=global_admin,
local_administrator=local_admin)
else:
raise ValueError('Invalid Route Target or Route Origin value: %s' %
value)
return ext_com
def insert_vrf_path(self,
ip_nlri,
next_hop=None,
gen_lbl=False,
is_withdraw=False):
assert ip_nlri
pattrs = None
label_list = []
vrf_conf = self.vrf_conf
if not is_withdraw:
# Create a dictionary for path-attrs.
pattrs = OrderedDict()
# MpReachNlri and/or MpUnReachNlri attribute info. is contained
# in the path. Hence we do not add these attributes here.
from ryu.services.protocols.bgp.core import EXPECTED_ORIGIN
pattrs[BGP_ATTR_TYPE_ORIGIN] = BGPPathAttributeOrigin(
EXPECTED_ORIGIN)
pattrs[BGP_ATTR_TYPE_AS_PATH] = BGPPathAttributeAsPath([])
communities = []
for rt in vrf_conf.export_rts:
as_num, local_admin = rt.split(':')
subtype = 2
communities.append(
BGPTwoOctetAsSpecificExtendedCommunity(
as_number=int(as_num),
local_administrator=int(local_admin),
subtype=subtype))
for soo in vrf_conf.soo_list:
as_num, local_admin = rt.split(':')
subtype = 3
communities.append(
BGPTwoOctetAsSpecificExtendedCommunity(
as_number=int(as_num),
local_administrator=int(local_admin),
subtype=subtype))
pattrs[BGP_ATTR_TYPE_EXTENDED_COMMUNITIES] = \
BGPPathAttributeExtendedCommunities(communities=communities)
if vrf_conf.multi_exit_disc:
pattrs[BGP_ATTR_TYPE_MULTI_EXIT_DISC] = \
BGPPathAttributeMultiExitDisc(vrf_conf.multi_exit_disc)
table_manager = self._core_service.table_manager
if gen_lbl and next_hop:
# Label per next_hop demands we use a different label
# per next_hop. Here connected interfaces are advertised per
# VRF.
label_key = (vrf_conf.route_dist, next_hop)
nh_label = table_manager.get_nexthop_label(label_key)
if not nh_label:
nh_label = table_manager.get_next_vpnv4_label()
table_manager.set_nexthop_label(label_key, nh_label)
label_list.append(nh_label)
elif gen_lbl:
# If we do not have next_hop, get a new label.
label_list.append(table_manager.get_next_vpnv4_label())
puid = self.VRF_PATH_CLASS.create_puid(vrf_conf.route_dist,
ip_nlri.prefix)
path = self.VRF_PATH_CLASS(puid,
None,
ip_nlri,
0,
pattrs=pattrs,
nexthop=next_hop,
label_list=label_list,
is_withdraw=is_withdraw)
# Insert the path into VRF table, get affected destination so that we
# can process it further.
eff_dest = self.insert(path)
# Enqueue the eff_dest for further processing.
self._signal_bus.dest_changed(eff_dest)
return label_list
def insert_vrf_path(self,
nlri,
next_hop=None,
gen_lbl=False,
is_withdraw=False,
**kwargs):
assert nlri
pattrs = None
label_list = []
vrf_conf = self.vrf_conf
if not is_withdraw:
# Create a dictionary for path-attrs.
pattrs = OrderedDict()
# MpReachNlri and/or MpUnReachNlri attribute info. is contained
# in the path. Hence we do not add these attributes here.
from ryu.services.protocols.bgp.core import EXPECTED_ORIGIN
pattrs[BGP_ATTR_TYPE_ORIGIN] = BGPPathAttributeOrigin(
EXPECTED_ORIGIN)
pattrs[BGP_ATTR_TYPE_AS_PATH] = BGPPathAttributeAsPath([])
communities = []
for rt in vrf_conf.export_rts:
as_num, local_admin = rt.split(':')
subtype = 2
communities.append(
BGPTwoOctetAsSpecificExtendedCommunity(
as_number=int(as_num),
local_administrator=int(local_admin),
subtype=subtype))
for soo in vrf_conf.soo_list:
as_num, local_admin = soo.split(':')
subtype = 3
communities.append(
BGPTwoOctetAsSpecificExtendedCommunity(
as_number=int(as_num),
local_administrator=int(local_admin),
subtype=subtype))
# Set Tunnel Encapsulation Attribute
tunnel_type = kwargs.get('tunnel_type', None)
if tunnel_type:
communities.append(
BGPEncapsulationExtendedCommunity.from_str(tunnel_type))
pattrs[BGP_ATTR_TYPE_EXTENDED_COMMUNITIES] = \
BGPPathAttributeExtendedCommunities(communities=communities)
if vrf_conf.multi_exit_disc:
pattrs[BGP_ATTR_TYPE_MULTI_EXIT_DISC] = \
BGPPathAttributeMultiExitDisc(vrf_conf.multi_exit_disc)
table_manager = self._core_service.table_manager
if gen_lbl and next_hop:
# Label per next_hop demands we use a different label
# per next_hop. Here connected interfaces are advertised per
# VRF.
label_key = (vrf_conf.route_dist, next_hop)
nh_label = table_manager.get_nexthop_label(label_key)
if not nh_label:
nh_label = table_manager.get_next_vpnv4_label()
table_manager.set_nexthop_label(label_key, nh_label)
label_list.append(nh_label)
elif gen_lbl:
# If we do not have next_hop, get a new label.
label_list.append(table_manager.get_next_vpnv4_label())
# Set PMSI Tunnel Attribute
pmsi_tunnel_type = kwargs.get('pmsi_tunnel_type', None)
if pmsi_tunnel_type is not None:
from ryu.services.protocols.bgp.api.prefix import (
PMSI_TYPE_INGRESS_REP)
if pmsi_tunnel_type == PMSI_TYPE_INGRESS_REP:
tunnel_id = PmsiTunnelIdIngressReplication(
tunnel_endpoint_ip=self._core_service.router_id)
else: # pmsi_tunnel_type == PMSI_TYPE_NO_TUNNEL_INFO
tunnel_id = None
pattrs[BGP_ATTR_TYEP_PMSI_TUNNEL_ATTRIBUTE] = \
BGPPathAttributePmsiTunnel(pmsi_flags=0,
tunnel_type=pmsi_tunnel_type,
tunnel_id=tunnel_id)
# Set MPLS labels with the generated labels
if gen_lbl and isinstance(nlri, EvpnMacIPAdvertisementNLRI):
nlri.mpls_labels = label_list[:2]
puid = self.VRF_PATH_CLASS.create_puid(vrf_conf.route_dist,
nlri.prefix)
path = self.VRF_PATH_CLASS(puid,
None,
nlri,
0,
pattrs=pattrs,
nexthop=next_hop,
label_list=label_list,
is_withdraw=is_withdraw)
# Insert the path into VRF table, get affected destination so that we
# can process it further.
eff_dest = self.insert(path)
# Enqueue the eff_dest for further processing.
self._signal_bus.dest_changed(eff_dest)
return label_list