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# encoding: utf-8 |
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""" |
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announce/__init__.py |
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Created by Thomas Mangin on 2015-06-04. |
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Copyright (c) 2009-2017 Exa Networks. All rights reserved. |
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""" |
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from exabgp.util import ordinal |
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from exabgp.util import character |
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from exabgp.util import concat_bytes_i |
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from exabgp.protocol.ip import IP |
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from exabgp.bgp.message import OUT |
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from exabgp.rib.change import Change |
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from exabgp.protocol.family import AFI |
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from exabgp.configuration.core import Section |
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from exabgp.bgp.message.update.nlri.cidr import CIDR |
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from exabgp.bgp.message.update.attribute import Attribute |
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# Take an integer an created it networked packed representation for the right family (ipv4/ipv6) |
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def pack_int (afi, integer): |
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return concat_bytes_i(character((integer >> (offset * 8)) & 0xff) for offset in range(IP.length(afi)-1,-1,-1)) |
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class ParseAnnounce (Section): |
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syntax = '' |
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afi = None |
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def post (self): |
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self._split() |
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routes = self.scope.pop(self.name) |
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if routes: |
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self.scope.extend_routes(routes) |
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return True |
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@staticmethod |
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def split (last): |
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if Attribute.CODE.INTERNAL_SPLIT not in last.attributes: |
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yield last |
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return |
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# ignore if the request is for an aggregate, or the same size |
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mask = last.nlri.cidr.mask |
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cut = last.attributes[Attribute.CODE.INTERNAL_SPLIT] |
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if mask >= cut: |
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yield last |
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return |
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# calculate the number of IP in the /<size> of the new route |
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increment = pow(2,last.nlri.afi.mask() - cut) |
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# how many new routes are we going to create from the initial one |
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number = pow(2,cut - last.nlri.cidr.mask) |
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# convert the IP into a integer/long |
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ip = 0 |
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for c in last.nlri.cidr.ton(): |
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ip <<= 8 |
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ip += ordinal(c) |
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afi = last.nlri.afi |
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safi = last.nlri.safi |
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# Really ugly |
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klass = last.nlri.__class__ |
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path_info = last.nlri.path_info |
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nexthop = last.nlri.nexthop |
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# XXX: Looks weird to set and then set to None, check |
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last.nlri.cidr.mask = cut |
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last.nlri = None |
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# generate the new routes |
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for _ in range(number): |
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# update ip to the next route, this recalculate the "ip" field of the Inet class |
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nlri = klass(afi,safi,OUT.ANNOUNCE) |
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nlri.cidr = CIDR(pack_int(afi,ip),cut) |
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nlri.nexthop = nexthop # nexthop can be NextHopSelf |
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nlri.path_info = path_info |
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# next ip |
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ip += increment |
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yield Change(nlri,last.attributes) |
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def _split (self): |
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for route in self.scope.pop_routes(): |
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for splat in self.split(route): |
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self.scope.append_route(splat) |
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def _check(self): |
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if not self.check(self.scope.get(self.name), self.afi): |
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return self.error.set(self.syntax) |
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return True |
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@staticmethod |
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def check (change,afi): |
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raise RuntimeError('need to be implemented by subclasses') |
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class SectionAnnounce (ParseAnnounce): |
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name = 'announce' |
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def __init__ (self, tokeniser, scope, error, logger): |
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Section.__init__(self,tokeniser,scope,error,logger) |
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def clear (self): |
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return True |
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def pre (self): |
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return True |
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def post (self): |
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routes = self.scope.pop('routes',[]) |
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self.scope.pop() |
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if routes: |
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self.scope.extend('routes',routes) |
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self.scope.pop(self.name) |
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return True |
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class AnnounceIPv4 (ParseAnnounce): |
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name = 'ipv4' |
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afi = AFI.ipv4 |
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def clear (self): |
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return True |
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class AnnounceIPv6 (ParseAnnounce): |
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name = 'ipv6' |
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afi = AFI.ipv6 |
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def clear (self): |
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return True |
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class AnnounceL2VPN (ParseAnnounce): |
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name = 'l2vpn' |
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afi = AFI.l2vpn |
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def clear (self): |
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return True |
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Exa-Networks /
exabgp
