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# encoding: utf-8 |
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""" |
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community.py |
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Created by Thomas Mangin on 2009-11-05. |
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Copyright (c) 2009-2017 Exa Networks. All rights reserved. |
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License: 3-clause BSD. (See the COPYRIGHT file) |
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""" |
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from exabgp.util import ordinal |
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from exabgp.bgp.message.update.attribute import Attribute |
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from struct import pack |
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# ======================================================= ExtendedCommunity (16) |
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# XXX: Should subclasses register with transitivity ? |
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class ExtendedCommunityBase (Attribute): |
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COMMUNITY_TYPE = 0x00 # MUST be redefined by subclasses |
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COMMUNITY_SUBTYPE = 0x00 # MUST be redefined by subclasses |
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NON_TRANSITIVE = 0x40 |
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registered_extended = {} |
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@classmethod |
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def register (cls, klass): |
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cls.registered_extended[(klass.COMMUNITY_TYPE & 0x0F,klass.COMMUNITY_SUBTYPE)] = klass |
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return klass |
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# size of value for data (boolean: is extended) |
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length_value = {False:7, True:6} |
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name = {False: 'regular', True: 'extended'} |
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__slots__ = ['community'] |
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def __init__ (self, community): |
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# Two top bits are iana and transitive bits |
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self.community = community |
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self.klass = None |
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def __eq__(self, other): |
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return \ |
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self.ID == other.ID and \ |
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self.FLAG == other.FLAG and \ |
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self.community == other.community |
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def __ne__(self, other): |
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return not self.__eq__(other) |
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def __lt__ (self, other): |
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return self.community < other.community |
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def __le__ (self, other): |
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return self.community <= other.community |
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def __gt__ (self, other): |
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return self.community > other.community |
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def __ge__ (self, other): |
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return self.community >= other.community |
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def iana (self): |
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return not not (self.community[0] & 0x80) |
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def transitive (self): |
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# bit set means "not transitive" |
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# RFC4360: |
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# T - Transitive bit |
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# Value 0: The community is transitive across ASes |
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# Value 1: The community is non-transitive across ASes |
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return not (self.community[0] & 0x40) |
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def pack (self, negotiated=None): |
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return self.community |
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def _subtype (self, transitive=True): |
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# if not transitive -> set the 'transitive' bit, as per RFC4360 |
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return pack( |
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'!BB', |
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self.COMMUNITY_TYPE if transitive else self.COMMUNITY_TYPE | self.NON_TRANSITIVE, |
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self.COMMUNITY_SUBTYPE |
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) |
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def json (self): |
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h = 0x00 |
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for byte in self.community: |
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h <<= 8 |
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h += ordinal(byte) |
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s = self.klass.__repr__(self) if self.klass else '' |
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return '{ "value": %s, "string": "%s" }' % (h,s) |
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def __repr__ (self): |
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if self.klass: |
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return self.klass.__repr__(self) |
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h = 0x00 |
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for byte in self.community: |
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h <<= 8 |
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h += ordinal(byte) |
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return "0x%016X" % h |
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def __hash__ (self): |
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return hash(self.community) |
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@staticmethod |
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def unpack (data, negotiated=None): |
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# 30/02/12 Quagga communities for soo and rt are not transitive when 4360 says they must be, hence the & 0x0FFF |
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community = (ordinal(data[0]) & 0x0F,ordinal(data[1])) |
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if community in ExtendedCommunity.registered_extended: |
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klass = ExtendedCommunity.registered_extended[community] |
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instance = klass.unpack(data) |
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instance.klass = klass |
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return instance |
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return ExtendedCommunity(data) |
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class ExtendedCommunity (ExtendedCommunityBase): |
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ID = Attribute.CODE.EXTENDED_COMMUNITY |
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FLAG = Attribute.Flag.TRANSITIVE | Attribute.Flag.OPTIONAL |
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def __len__ (self): |
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return 8 |
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class ExtendedCommunityIPv6 (ExtendedCommunityBase): |
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ID = Attribute.CODE.IPV6_EXTENDED_COMMUNITY |
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FLAG = Attribute.Flag.TRANSITIVE | Attribute.Flag.OPTIONAL |
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def __len__ (self): |
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return 20 |
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Exa-Networks /
exabgp
