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# encoding: utf-8 |
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""" |
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sr/srv6vpnsid.py |
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Created by Hiroki Shirokura 2020-01-09 |
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Copyright (c) 2020 Hiroki Shirokura . All rights reserved. |
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""" |
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from struct import pack |
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from exabgp.util import concat_bytes |
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from exabgp.protocol.ip import IP |
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from exabgp.bgp.message.notification import Notify |
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from exabgp.bgp.message.update.attribute.sr.prefixsid import PrefixSid |
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# 0 1 2 3 |
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# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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# | Type | Length | RESERVED | |
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# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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# | SID-Type | SID-Flags | | |
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# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
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# | | |
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# | IPv6 SID (16 octets) | |
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# | | |
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# | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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# | | |
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# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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# 3.2. SRv6 VPN SID |
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View Code Duplication |
@PrefixSid.register() |
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class Srv6VpnSid(object): |
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TLV = 4 |
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LENGTH = 19 |
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def __init__ (self,vpnsid,packed=None): |
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self.vpnsid = vpnsid |
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self.packed = self.pack() |
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def __repr__ (self): |
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return "srv6-vpn-sid %s" % (self.vpnsid) |
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def pack (self): |
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return concat_bytes( |
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pack('!B', self.TLV), |
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pack('!H', self.LENGTH), |
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pack('!B', 0), |
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pack('!B', 0), |
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pack('!B', 0), |
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IP.pton(self.vpnsid) |
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) |
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@classmethod |
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def unpack (cls,data,length): |
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vpnsid = -1 |
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if cls.LENGTH != length: |
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raise Notify(3,5, "Invalid TLV size. Should be {0} but {1} received".format(cls.LENGTH, length)) |
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data = data[3:19] |
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vpnsid = IP.unpack(data) |
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return cls(vpnsid=str(vpnsid),packed=data) |
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def json (self, compact=None): |
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return '"srv6-vpn-sid": "%s"' % (self.vpnsid) |
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Exa-Networks /
exabgp
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