def redirect(tokeniser):
data = tokeniser()
if data.count(':') == 1:
prefix, suffix = data.split(':', 1)
if prefix.count('.'):
raise ValueError(
'this format has been deprecaded as it does not make sense and it is not supported by other vendors'
)
asn = int(prefix)
route_target = int(suffix)
if asn >= pow(2, 32):
raise ValueError('asn is a 32 bits number, value too large %s' %
asn)
if asn >= pow(2, 16):
if route_target >= pow(2, 16):
raise ValueError(
'asn is a 32 bits number, route target can only be 16 bit %s'
% route_target)
return NoNextHop, ExtendedCommunities().add(
TrafficRedirectASN4(asn, route_target))
if route_target >= pow(2, 32):
raise ValueError(
'route target is a 32 bits number, value too large %s' %
route_target)
return NoNextHop, ExtendedCommunities().add(
TrafficRedirect(asn, route_target))
else:
return IP.create(data), ExtendedCommunities().add(
TrafficNextHop(False))
def redirect(tokeniser):
data = tokeniser()
count = data.count(':')
if count == 0:
return IP.create(data), ExtendedCommunities().add(
TrafficNextHopSimpson(False))
if count == 1:
prefix, suffix = data.split(':', 1)
if prefix.count('.'):
raise ValueError(
'this format has been deprecated as it does not make sense and it is not supported by other vendors'
)
asn = int(prefix)
route_target = int(suffix)
if asn >= pow(2, 32):
raise ValueError('asn is a 32 bits number, value too large %s' %
asn)
if asn >= pow(2, 16):
if route_target >= pow(2, 16):
raise ValueError(
'asn is a 32 bits number, route target can only be 16 bit %s'
% route_target)
return NoNextHop, ExtendedCommunities().add(
TrafficRedirectASN4(asn, route_target))
if route_target >= pow(2, 32):
raise ValueError(
'route target is a 32 bits number, value too large %s' %
route_target)
return NoNextHop, ExtendedCommunities().add(
TrafficRedirect(asn, route_target))
else:
explicit_v6 = ']:' in data
# ipv4
if not explicit_v6 and data.count(':') == 1:
return IP.create(data), ExtendedCommunities().add(
TrafficNextHopSimpson(False))
# ipv6 using []: notation
if explicit_v6:
ip, asn = data.split(']:')
ip = ip.replace('[', '', 1)
# FIXME: should this be 2^16 ??
if asn >= pow(2, 32):
raise ValueError(
'asn is a 32 bits number, value too large %s' % asn)
return IP.create(ip), ExtendedCommunities().add(
TrafficRedirectIPv6(ip, asn))
raise ValueError(
'it looks like you tried to use an IPv6 but did not enclose it in []'
)
def redirect(self, scope, name, command, tokens):
try:
if tokens[0].count(':') == 1:
prefix, suffix = tokens[0].split(':', 1)
if prefix.count('.'):
raise ValueError(
'this format has been deprecaded as it does not make sense and it is not supported by other vendors'
)
else:
asn = int(prefix)
route_target = int(suffix)
if asn >= pow(2, 16):
raise ValueError(
'asn is a 32 bits number, it can only be 16 bit %s'
% route_target)
if route_target >= pow(2, 32):
raise ValueError(
'route target is a 32 bits number, value too large %s'
% route_target)
scope[-1]['announce'][-1].attributes[
Attribute.CODE.EXTENDED_COMMUNITY].add(
TrafficRedirect(asn, route_target))
return True
else:
change = scope[-1]['announce'][-1]
if change.nlri.nexthop is not NoNextHop:
return self.error.set(self.syntax)
nh = IP.create(tokens.pop(0))
change.nlri.nexthop = nh
change.attributes[Attribute.CODE.EXTENDED_COMMUNITY].add(
TrafficNextHop(False))
return True
except (IndexError, ValueError):
return self.error.set(self.syntax)