def ip_vpn(tokeniser, afi, safi):
action = OUT.ANNOUNCE if tokeniser.announce else OUT.WITHDRAW
ipmask = prefix(tokeniser)
nlri = IPVPN(afi, safi, action)
nlri.cidr = CIDR(ipmask.pack(), ipmask.mask)
change = Change(nlri, Attributes())
while True:
command = tokeniser()
if not command:
break
action = AnnounceVPN.action.get(command, '')
if action == 'attribute-add':
change.attributes.add(AnnounceVPN.known[command](tokeniser))
elif action == 'nlri-set':
change.nlri.assign(AnnounceVPN.assign[command],
AnnounceVPN.known[command](tokeniser))
elif action == 'nexthop-and-attribute':
nexthop, attribute = AnnounceVPN.known[command](tokeniser)
change.nlri.nexthop = nexthop
change.attributes.add(attribute)
else:
raise ValueError('unknown command "%s"' % command)
if not AnnounceVPN.check(change, afi):
raise ValueError(
'invalid announcement (missing next-hop, label or rd ?)')
return [change]
def ip_vpn(tokeniser, afi, safi):
ipmask = prefix(tokeniser)
nlri = IPVPN(afi, safi, OUT.ANNOUNCE)
nlri.cidr = CIDR(ipmask.pack(), ipmask.mask)
change = Change(nlri, Attributes())
while True:
command = tokeniser()
if not command:
break
action = ParseVPN.action.get(command, '')
if action == 'attribute-add':
change.attributes.add(ParseVPN.known[command](tokeniser))
elif action == 'nlri-set':
change.nlri.assign(ParseVPN.assign[command],
ParseVPN.known[command](tokeniser))
elif action == 'nexthop-and-attribute':
nexthop, attribute = ParseVPN.known[command](tokeniser)
change.nlri.nexthop = nexthop
change.attributes.add(attribute)
else:
raise ValueError('route: unknown command "%s"' % command)
return [change]
def ip_multicast(tokeniser, afi, safi):
action = OUT.ANNOUNCE if tokeniser.announce else OUT.WITHDRAW
ipmask = prefix(tokeniser)
nlri = INET(afi, safi, action)
nlri.cidr = CIDR(ipmask.pack(), ipmask.mask)
change = Change(nlri, Attributes())
while True:
command = tokeniser()
if not command:
break
action = AnnounceIP.action.get(command, '')
if action == 'attribute-add':
change.attributes.add(AnnounceIP.known[command](tokeniser))
elif action == 'nlri-set':
change.nlri.assign(AnnounceIP.assign[command],
AnnounceIP.known[command](tokeniser))
elif action == 'nexthop-and-attribute':
nexthop, attribute = AnnounceIP.known[command](tokeniser)
change.nlri.nexthop = nexthop
change.attributes.add(attribute)
else:
raise ValueError('unknown command "%s"' % command)
return [change]
def unpack_nlri(cls, afi, safi, bgp, action, addpath):
nlri = cls(afi, safi, action)
if addpath:
nlri.path_info = PathInfo(bgp[:4])
bgp = bgp[4:]
mask = bgp[0]
bgp = bgp[1:]
_, rd_size = Family.size.get((afi, safi), (0, 0))
rd_mask = rd_size * 8
if safi.has_label():
labels = []
while mask - rd_mask >= 24:
label = int(unpack('!L', bytes([0]) + bgp[:3])[0])
bgp = bgp[3:]
mask -= 24 # 3 bytes
# The last 4 bits are the bottom of Stack
# The last bit is set for the last label
labels.append(label >> 4)
# This is a route withdrawal
if label == 0x800000 and action == IN.WITHDRAWN:
break
# This is a next-hop
if label == 0x000000:
break
if label & 1:
break
nlri.labels = Labels(labels)
if rd_size:
mask -= rd_mask # the route distinguisher
rd = bgp[:rd_size]
bgp = bgp[rd_size:]
nlri.rd = RouteDistinguisher(rd)
if mask < 0:
raise Notify(3, 10, 'invalid length in NLRI prefix')
if not bgp and mask:
raise Notify(
3, 10,
'not enough data for the mask provided to decode the NLRI')
size = CIDR.size(mask)
if len(bgp) < size:
raise Notify(
3, 10,
'could not decode route with family %s (AFI %d) %s (SAFI %d)' %
(AFI(afi), int(afi), SAFI(safi), int(safi)))
network, bgp = bgp[:size], bgp[size:]
nlri.cidr = CIDR(network + bytes(IP.length(afi) - size), mask)
return nlri, bgp
def new(cls, afi, safi, packed, mask, labels, rd, nexthop, action):
instance = cls(afi, safi, OUT.ANNOUNCE)
instance.cidr = CIDR(packed, mask)
instance.labels = labels
instance.rd = rd
instance.nexthop = NextHop(IP.ntop(nexthop), nexthop)
instance.action = action
return instance
def new (cls, afi, safi, packed, mask, labels, rd, nexthop=None, action=OUT.UNSET): instance = cls(afi,safi,action) instance.cidr = CIDR(packed, mask) instance.labels = labels instance.rd = rd instance.nexthop = IP.create(nexthop) if nexthop else NoNextHop instance.action = action return instance
def unpack_nlri(cls, afi, safi, bgp, action, addpath):
nlri = cls(afi, safi, action)
if addpath:
nlri.path_info = PathInfo(bgp[:4])
bgp = bgp[4:]
mask = ord(bgp[0])
bgp = bgp[1:]
if cls.has_label():
labels = []
while bgp and mask >= 8:
label = int(unpack('!L', chr(0) + bgp[:3])[0])
bgp = bgp[3:]
mask -= 24 # 3 bytes
# The last 4 bits are the bottom of Stack
# The last bit is set for the last label
labels.append(label >> 4)
# This is a route withdrawal
if label == 0x800000 and action == IN.WITHDRAWN:
break
# This is a next-hop
if label == 0x000000:
break
if label & 1:
break
nlri.labels = Labels(labels)
if cls.has_rd():
mask -= 8 * 8 # the 8 bytes of the route distinguisher
rd = bgp[:8]
bgp = bgp[8:]
nlri.rd = RouteDistinguisher(rd)
if mask < 0:
raise Notify(3, 10, 'invalid length in NLRI prefix')
if not bgp and mask:
raise Notify(
3, 10,
'not enough data for the mask provided to decode the NLRI')
size = CIDR.size(mask)
if len(bgp) < size:
raise Notify(
3, 10, 'could not decode route with AFI %d sand SAFI %d' %
(afi, safi))
network, bgp = bgp[:size], bgp[size:]
padding = '\0' * (IP.length(afi) - size)
nlri.cidr = CIDR(network + padding, mask)
return nlri, bgp
def split(last):
if Attribute.CODE.INTERNAL_SPLIT not in last.attributes:
yield last
return
# ignore if the request is for an aggregate, or the same size
mask = last.nlri.cidr.mask
cut = last.attributes[Attribute.CODE.INTERNAL_SPLIT]
if mask >= cut:
yield last
return
# calculate the number of IP in the /<size> of the new route
increment = pow(2, last.nlri.afi.mask() - cut)
# how many new routes are we going to create from the initial one
number = pow(2, cut - last.nlri.cidr.mask)
# convert the IP into a integer/long
ip = 0
for c in last.nlri.cidr.ton():
ip <<= 8
ip += c
afi = last.nlri.afi
safi = last.nlri.safi
# Really ugly
klass = last.nlri.__class__
nexthop = last.nlri.nexthop
if safi.has_path():
path_info = last.nlri.path_info
if safi.has_label():
labels = last.nlri.labels
if safi.has_rd():
rd = last.nlri.rd
# XXX: Looks weird to set and then set to None, check
last.nlri.cidr.mask = cut
last.nlri = None
# generate the new routes
for _ in range(number):
# update ip to the next route, this recalculate the "ip" field of the Inet class
nlri = klass(afi, safi, OUT.ANNOUNCE)
nlri.cidr = CIDR(pack_int(afi, ip), cut)
nlri.nexthop = nexthop # nexthop can be NextHopSelf
if safi.has_path():
nlri.path_info = path_info
if safi.has_label():
nlri.labels = labels
if safi.has_rd():
nlri.rd = rd
# next ip
ip += increment
yield Change(nlri, last.attributes)
def __init__(self, raw, netmask, offset):
self.cidr = CIDR(raw, netmask)
self.offset = offset
def __init__(self, raw, netmask):
self.cidr = CIDR(raw, netmask)
def __init__(self, raw, netmask):
self.nlri = CIDR(raw, netmask)
