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 extended_community(tokeniser):
communities = ExtendedCommunities()
value = tokeniser()
if value == "[":
while True:
value = tokeniser()
if value == "]":
break
communities.add(_extended_community(value))
else:
communities.add(_extended_community(value))
return communities
def interface_set (tokeniser): communities = ExtendedCommunities() value = tokeniser() if value == '[': while True: value = tokeniser() if value == ']': break communities.add(_interface_set(value)) else: communities.add(_interface_set(value)) return communities
def rate_limit(tokeniser):
# README: We are setting the ASN as zero as that what Juniper (and Arbor) did when we created a local flow route
speed = int(tokeniser())
if speed < 9600 and speed != 0:
log.warning("rate-limiting flow under 9600 bytes per seconds may not work", 'configuration')
if speed > 1000000000000:
speed = 1000000000000
log.warning("rate-limiting changed for 1 000 000 000 000 bytes from %s" % speed, 'configuration')
return ExtendedCommunities().add(TrafficRate(ASN(0), speed))
def action(tokeniser):
value = tokeniser()
sample = 'sample' in value
terminal = 'terminal' in value
if not sample and not terminal:
raise ValueError('invalid flow action')
return ExtendedCommunities().add(TrafficAction(sample, terminal))
def mark(tokeniser):
value = tokeniser()
if not value.isdigit():
raise ValueError('dscp is not a number')
dscp_value = int(value)
if dscp_value < 0 or dscp_value > 0b111111:
raise ValueError('dscp is not a valid number')
return ExtendedCommunities().add(TrafficMark(dscp_value))
def extended_community(self, scope, name, command, tokens):
attributes = scope[-1]['announce'][-1].attributes
if Attribute.CODE.EXTENDED_COMMUNITY in attributes:
extended_communities = attributes[
Attribute.CODE.EXTENDED_COMMUNITY]
else:
extended_communities = ExtendedCommunities()
attributes.add(extended_communities)
extended_community = tokens.pop(0)
try:
if extended_community == '[':
while True:
try:
extended_community = tokens.pop(0)
except IndexError:
return self.error.set(self.syntax)
if extended_community == ']':
break
extended_communities.add(
self._parse_extended_community(scope,
extended_community))
else:
extended_communities.add(
self._parse_extended_community(scope, extended_community))
except ValueError:
return self.error.set(self.syntax)
return True
def extended_community (self, scope, name, command, tokens): attributes = scope[-1]['announce'][-1].attributes if Attribute.CODE.EXTENDED_COMMUNITY in attributes: extended_communities = attributes[Attribute.CODE.EXTENDED_COMMUNITY] else: extended_communities = ExtendedCommunities() attributes.add(extended_communities) extended_community = tokens.pop(0) try: if extended_community == '[': while True: try: extended_community = tokens.pop(0) except IndexError: return self.error.set(self.syntax) if extended_community == ']': break extended_communities.add(self._parse_extended_community(scope,extended_community)) else: extended_communities.add(self._parse_extended_community(scope,extended_community)) except ValueError: return self.error.set(self.syntax) return True
def interface_set(tokeniser):
communities = ExtendedCommunities()
value = tokeniser()
if value == '[':
while True:
value = tokeniser()
if value == ']':
break
communities.add(_interface_set(value))
else:
communities.add(_interface_set(value))
return communities
def extended_community(tokeniser):
communities = ExtendedCommunities()
value = tokeniser()
if value == '[':
while True:
value = tokeniser()
if value == ']':
break
communities.add(_extended_community(value))
else:
communities.add(_extended_community(value))
return communities
def copy(tokeniser):
return IP.create(tokeniser()), ExtendedCommunities().add(TrafficNextHopSimpson(True))
def redirect_next_hop_ietf(tokeniser):
ip = IP.create(tokeniser())
if ip.ipv4():
return ExtendedCommunities().add(TrafficNextHopIPv4IETF(ip, False))
else:
return ExtendedCommunitiesIPv6().add(TrafficNextHopIPv6IETF(ip, False))
def redirect_next_hop(tokeniser):
return ExtendedCommunities().add(TrafficNextHopSimpson(False))
def discard(tokeniser):
# README: We are setting the ASN as zero as that what Juniper (and Arbor) did when we created a local flow route
return ExtendedCommunities().add(TrafficRate(ASN(0), 0))
