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_next_hop(self, scope, name, command, tokens):
try:
change = scope[-1]['announce'][-1]
if change.nlri.nexthop is NoNextHop:
return self.error.set(self.syntax)
change.attributes[Attribute.CODE.EXTENDED_COMMUNITY].add(
TrafficNextHop(False))
return True
except (IndexError, ValueError):
return self.error.set(self.syntax)
def copy(self, scope, name, command, tokens):
# README: We are setting the ASN as zero as that what Juniper (and Arbor) did when we created a local flow route
try:
if scope[-1]['announce'][-1].attributes.has(
Attribute.CODE.NEXT_HOP):
return self.error.set(self.syntax)
change = scope[-1]['announce'][-1]
change.nlri.nexthop = IP.create(tokens.pop(0))
change.attributes[Attribute.CODE.EXTENDED_COMMUNITY].add(
TrafficNextHop(True))
return True
except (IndexError, ValueError):
return self.error.set(self.syntax)
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)
def copy(tokeniser):
return IP.create(tokeniser()), ExtendedCommunities().add(
TrafficNextHop(True))
def redirect_next_hop(tokeniser):
return ExtendedCommunities().add(TrafficNextHop(False))
