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BGPSpeaker: Support to advertise Type 1, 2 Route Target

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Currently, BGPSpeaker supports only type 0 (Two-Octet AS-Specific) Route
Target (or Route Distinguisher).
This patch enables to advertise Type 1 (IPv4-Address-Specific) and Type
2 (Four-Octet AS-Specific) Route Targets.

Reported-by: Albert Siersema <albert@mediacaster.nl>
Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
This commit is contained in:
IWASE Yusuke 2017-01-30 16:43:43 +09:00 committed by FUJITA Tomonori
parent 6c92a75aa8
commit c4218ccde3
2 changed files with 41 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
ryu/services/protocols/bgp/info_base/vrf.py
View File

@ -30,7 +30,6 @@ from ryu.lib.packet.bgp import BGPPathAttributeOrigin
from ryu.lib.packet.bgp import BGPPathAttributeAsPath
from ryu.lib.packet.bgp import EvpnEthernetSegmentNLRI
from ryu.lib.packet.bgp import BGPPathAttributeExtendedCommunities
from ryu.lib.packet.bgp import BGPTwoOctetAsSpecificExtendedCommunity
from ryu.lib.packet.bgp import BGPPathAttributeMultiExitDisc
from ryu.lib.packet.bgp import BGPEncapsulationExtendedCommunity
from ryu.lib.packet.bgp import BGPEvpnEsiLabelExtendedCommunity
@ -47,6 +46,7 @@ from ryu.services.protocols.bgp.constants import VRF_TABLE
from ryu.services.protocols.bgp.info_base.base import Destination
from ryu.services.protocols.bgp.info_base.base import Path
from ryu.services.protocols.bgp.info_base.base import Table
from ryu.services.protocols.bgp.utils.bgp import create_rt_extended_community
from ryu.services.protocols.bgp.utils.stats import LOCAL_ROUTES
from ryu.services.protocols.bgp.utils.stats import REMOTE_ROUTES
from ryu.services.protocols.bgp.utils.stats import RESOURCE_ID
@ -267,19 +267,9 @@ class VrfTable(Table):
es_import=es_import))
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))
communities.append(create_rt_extended_community(rt, 2))
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))
communities.append(create_rt_extended_community(soo, 3))
# Set Tunnel Encapsulation Attribute
tunnel_type = kwargs.get('tunnel_type', None)

38
ryu/services/protocols/bgp/utils/bgp.py
View File

@ -19,6 +19,8 @@
import logging
import socket
import netaddr
from ryu.lib.packet.bgp import (
BGPUpdate,
RF_IPv4_UC,
@ -36,6 +38,9 @@ from ryu.lib.packet.bgp import (
BGPPathAttributeUnknown,
BGP_ATTR_FLAG_OPTIONAL,
BGP_ATTR_FLAG_TRANSITIVE,
BGPTwoOctetAsSpecificExtendedCommunity,
BGPIPv4AddressSpecificExtendedCommunity,
BGPFourOctetAsSpecificExtendedCommunity,
)
from ryu.services.protocols.bgp.info_base.rtc import RtcPath
from ryu.services.protocols.bgp.info_base.ipv4 import Ipv4Path
@ -141,3 +146,36 @@ def create_end_of_rib_update():
# Bgp update message instance that can used as End of RIB marker.
UPDATE_EOR = create_end_of_rib_update()
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 netaddr.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