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# encoding: utf-8 |
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""" |
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announce/label.py |
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Created by Thomas Mangin on 2017-07-05. |
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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.protocol.ip import NoNextHop |
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from exabgp.rib.change import Change |
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from exabgp.bgp.message import OUT |
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from exabgp.protocol.family import AFI |
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from exabgp.protocol.family import SAFI |
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from exabgp.bgp.message.update.nlri.inet import INET |
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from exabgp.bgp.message.update.nlri.cidr import CIDR |
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from exabgp.bgp.message.update.attribute import Attributes |
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from exabgp.configuration.announce import ParseAnnounce |
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from exabgp.configuration.announce.ip import AnnounceIP |
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from exabgp.configuration.static.parser import prefix |
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from exabgp.configuration.static.parser import path_information |
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class AnnouncePath (AnnounceIP): |
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# put next-hop first as it is a requirement atm |
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definition = [ |
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'label <15 bits number>', |
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] + AnnounceIP.definition |
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syntax = \ |
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'<safi> <ip>/<netmask> { ' \ |
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'\n ' + ' ;\n '.join(definition) + '\n}' |
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known = dict(AnnounceIP.known,**{ |
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'path-information': path_information, |
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}) |
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action = dict(AnnounceIP.action,**{ |
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'path-information': 'nlri-set', |
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}) |
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assign = dict(AnnounceIP.assign,**{ |
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'path-information': 'path_info', |
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}) |
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name = 'path' |
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afi = None |
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def __init__ (self, tokeniser, scope, error, logger): |
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AnnounceIP.__init__(self,tokeniser,scope,error,logger) |
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def clear (self): |
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return True |
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@staticmethod |
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def check (change,afi): |
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if not AnnounceIP.check(change,afi): |
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return False |
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return True |
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View Code Duplication |
def ip_unicast (tokeniser,afi,safi): |
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action = OUT.ANNOUNCE if tokeniser.announce else OUT.WITHDRAW |
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ipmask = prefix(tokeniser) |
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nlri = INET(afi, safi, action) |
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nlri.cidr = CIDR(ipmask.pack(),ipmask.mask) |
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change = Change( |
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nlri, |
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Attributes() |
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) |
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while True: |
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command = tokeniser() |
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if not command: |
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break |
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action = AnnouncePath.action.get(command,'') |
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if action == 'attribute-add': |
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change.attributes.add(AnnouncePath.known[command](tokeniser)) |
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elif action == 'nlri-set': |
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change.nlri.assign(AnnouncePath.assign[command],AnnouncePath.known[command](tokeniser)) |
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elif action == 'nexthop-and-attribute': |
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nexthop,attribute = AnnouncePath.known[command](tokeniser) |
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change.nlri.nexthop = nexthop |
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change.attributes.add(attribute) |
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else: |
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raise ValueError('unknown command "%s"' % command) |
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if not AnnouncePath.check(change,afi): |
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raise ValueError('invalid announcement (missing next-hop ?)') |
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return [change] |
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@ParseAnnounce.register('unicast','extend-name','ipv4') |
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def unicast_v4 (tokeniser): |
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return ip_unicast(tokeniser,AFI.ipv4,SAFI.unicast) |
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@ParseAnnounce.register('unicast','extend-name','ipv6') |
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def unicast_v6 (tokeniser): |
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return ip_unicast(tokeniser,AFI.ipv6,SAFI.unicast) |
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Exa-Networks /
exabgp
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