def unpack_message(cls, data, negotiated): # pylint: disable=W0613
what = Type(unpack('!H', data[0:2])[0])
length = unpack('!H', data[2:4])[0]
decode, klass = cls.registered_operational.get(what, ('unknown', None))
if decode == 'advisory':
afi = unpack('!H', data[4:6])[0]
safi = ord_(data[6])
data = data[7:length + 4]
return klass(afi, safi, data)
elif decode == 'query':
afi = unpack('!H', data[4:6])[0]
safi = ord_(data[6])
routerid = RouterID.unpack(data[7:11])
sequence = unpack('!L', data[11:15])[0]
return klass(afi, safi, routerid, sequence)
elif decode == 'counter':
afi = unpack('!H', data[4:6])[0]
safi = ord_(data[6])
routerid = RouterID.unpack(data[7:11])
sequence = unpack('!L', data[11:15])[0]
counter = unpack('!L', data[15:19])[0]
return klass(afi, safi, routerid, sequence, counter)
else:
print('ignoring ATM this kind of message')
def unpack_message (cls, data, negotiated): # pylint: disable=W0613
what = Type(unpack('!H',data[0:2])[0])
length = unpack('!H',data[2:4])[0]
decode,klass = cls.registered_operational.get(what,('unknown',None))
if decode == 'advisory':
afi = unpack('!H',data[4:6])[0]
safi = ord_(data[6])
data = data[7:length+4]
return klass(afi,safi,data)
elif decode == 'query':
afi = unpack('!H',data[4:6])[0]
safi = ord_(data[6])
routerid = RouterID.unpack(data[7:11])
sequence = unpack('!L',data[11:15])[0]
return klass(afi,safi,routerid,sequence)
elif decode == 'counter':
afi = unpack('!H',data[4:6])[0]
safi = ord_(data[6])
routerid = RouterID.unpack(data[7:11])
sequence = unpack('!L',data[11:15])[0]
counter = unpack('!L',data[15:19])[0]
return klass(afi,safi,routerid,sequence,counter)
else:
print('ignoring ATM this kind of message')
def unpack(data, negotiated=None):
# 30/02/12 Quagga communities for soo and rt are not transitive when 4360 says they must be, hence the & 0x0FFF
community = (ord_(data[0]) & 0x0F, ord_(data[1]))
if community in ExtendedCommunity.registered_extended:
return ExtendedCommunity.registered_extended[community].unpack(
data)
return ExtendedCommunity(data)
def _new_aspaths(cls, data, asn4, klass=None):
as_set = []
as_seq = []
as_cset = []
as_cseq = []
backup = data
unpacker = {
False: '!H',
True: '!L',
}
size = {
False: 2,
True: 4,
}
as_choice = {
ASPath.AS_SEQUENCE: as_seq,
ASPath.AS_SET: as_set,
ASPath.AS_CONFED_SEQUENCE: as_cseq,
ASPath.AS_CONFED_SET: as_cset,
}
upr = unpacker[asn4]
length = size[asn4]
try:
while data:
stype = ord_(data[0])
slen = ord_(data[1])
if stype not in (ASPath.AS_SET, ASPath.AS_SEQUENCE,
ASPath.AS_CONFED_SEQUENCE,
ASPath.AS_CONFED_SET):
raise Notify(3, 11, 'invalid AS Path type sent %d' % stype)
end = 2 + (slen * length)
sdata = data[2:end]
data = data[end:]
# Eat the data and ignore it if the ASPath attribute is know known
asns = as_choice.get(stype, [])
for _ in range(slen):
asn = unpack(upr, sdata[:length])[0]
asns.append(ASN(asn))
sdata = sdata[length:]
except IndexError:
raise Notify(3, 11,
'not enough data to decode AS_PATH or AS4_PATH')
except error: # struct
raise Notify(3, 11,
'not enough data to decode AS_PATH or AS4_PATH')
if klass:
return klass(as_seq, as_set, as_cseq, as_cset, backup)
return cls(as_seq, as_set, as_cseq, as_cset, backup)
def flag_attribute_content (data):
flag = Attribute.Flag(ord_(data[0]))
attr = Attribute.CODE(ord_(data[1]))
if flag & Attribute.Flag.EXTENDED_LENGTH:
length = unpack('!H',data[2:4])[0]
return flag, attr, data[4:length+4]
else:
length = ord_(data[2])
return flag, attr, data[3:length+3]
def flag_attribute_content(data):
flag = Attribute.Flag(ord_(data[0]))
attr = Attribute.CODE(ord_(data[1]))
if flag & Attribute.Flag.EXTENDED_LENGTH:
length = unpack('!H', data[2:4])[0]
return flag, attr, data[4:length + 4]
else:
length = ord_(data[2])
return flag, attr, data[3:length + 3]
def _key_values (name, data): if len(data) < 2: raise Notify(2,0,"Bad length for OPEN %s (<2) %s" % (name,Capability.hex(data))) l = ord_(data[1]) boundary = l+2 if len(data) < boundary: raise Notify(2,0,"Bad length for OPEN %s (buffer underrun) %s" % (name,Capability.hex(data))) key = ord_(data[0]) value = data[2:boundary] rest = data[boundary:] return key,value,rest
def _new_aspaths (cls, data, asn4, klass=None):
as_set = []
as_seq = []
as_cset = []
as_cseq = []
backup = data
unpacker = {
False: '!H',
True: '!L',
}
size = {
False: 2,
True: 4,
}
as_choice = {
ASPath.AS_SEQUENCE: as_seq,
ASPath.AS_SET: as_set,
ASPath.AS_CONFED_SEQUENCE: as_cseq,
ASPath.AS_CONFED_SET: as_cset,
}
upr = unpacker[asn4]
length = size[asn4]
try:
while data:
stype = ord_(data[0])
slen = ord_(data[1])
if stype not in (ASPath.AS_SET, ASPath.AS_SEQUENCE, ASPath.AS_CONFED_SEQUENCE, ASPath.AS_CONFED_SET):
raise Notify(3,11,'invalid AS Path type sent %d' % stype)
end = 2+(slen*length)
sdata = data[2:end]
data = data[end:]
# Eat the data and ignore it if the ASPath attribute is know known
asns = as_choice.get(stype,[])
for _ in range(slen):
asn = unpack(upr,sdata[:length])[0]
asns.append(ASN(asn))
sdata = sdata[length:]
except IndexError:
raise Notify(3,11,'not enough data to decode AS_PATH or AS4_PATH')
except error: # struct
raise Notify(3,11,'not enough data to decode AS_PATH or AS4_PATH')
if klass:
return klass(as_seq,as_set,as_cseq,as_cset,backup)
return cls(as_seq,as_set,as_cseq,as_cset,backup)
def unpack_nlri (cls, afi, safi, bgp, action, addpath):
length,bgp = ord_(bgp[0]),bgp[1:]
if length & 0xF0 == 0xF0: # bigger than 240
extra,bgp = ord_(bgp[0]),bgp[1:]
length = ((length & 0x0F) << 16) + extra
if length > len(bgp):
raise Notify(3,10,'invalid length at the start of the the flow')
over = bgp[length:]
bgp = bgp[:length]
nlri = cls(afi,safi,action)
if safi == SAFI.flow_vpn:
nlri.rd = RouteDistinguisher(bgp[:8])
bgp = bgp[8:]
seen = []
while bgp:
what,bgp = ord_(bgp[0]),bgp[1:]
if what not in decode.get(afi,{}):
raise Notify(3,10,'unknown flowspec component received for address family %d' % what)
seen.append(what)
if sorted(seen) != seen:
raise Notify(3,10,'components are not sent in the right order %s' % seen)
decoded = decode[afi][what]
klass = factory[afi][what]
if decoded == 'prefix':
adding,bgp = klass.make(bgp)
if not nlri.add(adding):
raise Notify(3,10,'components are incompatible (two sources, two destinations, mix ipv4/ipv6) %s' % seen)
# logger.parser(LazyFormat("added flow %s (%s) payload " % (klass.NAME,adding),bgp[:-len(left)]))
else:
end = False
while not end:
byte,bgp = ord_(bgp[0]),bgp[1:]
end = CommonOperator.eol(byte)
operator = CommonOperator.operator(byte)
length = CommonOperator.length(byte)
value,bgp = bgp[:length],bgp[length:]
adding = klass.decoder(value)
nlri.add(klass(operator,adding))
# logger.parser(LazyFormat("added flow %s (%s) operator %d len %d payload " % (klass.NAME,adding,byte,length),value))
return nlri, bgp+over
def unpack(cls, data):
datalen = len(data)
rd = RouteDistinguisher.unpack(data[:8])
esi = ESI.unpack(data[8:18])
etag = EthernetTag.unpack(data[18:22])
maclength = ord_(data[22])
if (maclength > 48 or maclength < 0):
raise Notify(3, 5, 'invalid MAC Address length in %s' % cls.NAME)
end = 23 + 6 # MAC length MUST be 6
mac = MACQUAL.unpack(data[23:end])
length = ord_(data[end])
iplen = length / 8
if datalen in [33, 36]: # No IP information (1 or 2 labels)
iplenUnpack = 0
if iplen != 0:
raise Notify(
3, 5,
"IP length is given as %d, but current MAC route has no IP information"
% iplen)
elif datalen in [37, 40]: # Using IPv4 addresses (1 or 2 labels)
iplenUnpack = 4
if (iplen > 32 or iplen < 0):
raise Notify(
3, 5,
"IP field length is given as %d, but current MAC route is IPv4 and valus is out of range"
% iplen)
elif datalen in [49, 52]: # Using IPv6 addresses (1 or 2 labels)
iplenUnpack = 16
if (iplen > 128 or iplen < 0):
raise Notify(
3, 5,
"IP field length is given as %d, but current MAC route is IPv6 and valus is out of range"
% iplen)
else:
raise Notify(
3, 5,
"Data field length is given as %d, but does not match one of the expected lengths"
% datalen)
payload = data[end + 1:end + 1 + iplenUnpack]
if payload:
ip = IP.unpack(data[end + 1:end + 1 + iplenUnpack])
else:
ip = None
label = Labels.unpack(data[end + 1 + iplenUnpack:end + 1 +
iplenUnpack + 3])
return cls(rd, esi, etag, mac, maclength, label, ip, data)
def unpack_nlri(cls, afi, safi, bgp, action, addpath):
code = ord_(bgp[0])
length = ord_(bgp[1])
if code in cls.registered_evpn:
klass = cls.registered_evpn[code].unpack(bgp[2:length + 2])
else:
klass = GenericEVPN(code, bgp[2:length + 2])
klass.CODE = code
klass.action = action
klass.addpath = addpath
return klass, bgp[length + 2:]
def unpack_nlri (cls, afi, safi, bgp, action, addpath): code = ord_(bgp[0]) length = ord_(bgp[1]) if code in cls.registered_evpn: klass = cls.registered_evpn[code].unpack(bgp[2:length+2]) else: klass = GenericEVPN(code,bgp[2:length+2]) klass.CODE = code klass.action = action klass.addpath = addpath return klass,bgp[length+2:]
def unpack (data):
def _key_values (name, data):
if len(data) < 2:
raise Notify(2,0,"Bad length for OPEN %s (<2) %s" % (name,Capability.hex(data)))
l = ord_(data[1])
boundary = l+2
if len(data) < boundary:
raise Notify(2,0,"Bad length for OPEN %s (buffer underrun) %s" % (name,Capability.hex(data)))
key = ord_(data[0])
value = data[2:boundary]
rest = data[boundary:]
return key,value,rest
capabilities = Capabilities()
option_len = ord_(data[0])
if not option_len:
return capabilities
data = data[1:option_len+1]
while data:
key,value,data = _key_values('parameter',data)
# Paramaters must only be sent once.
if key == Parameter.AUTHENTIFICATION_INFORMATION:
raise Notify(2,5)
if key == Parameter.CAPABILITIES:
while value:
capability,capv,value = _key_values('capability',value)
capabilities[capability] = Capability.unpack(capability,capabilities,capv)
else:
raise Notify(2,0,'Unknow OPEN parameter %s' % hex(key))
return capabilities
def unpack (cls, exdata): data = exdata # Get the data length to understand if addresses are IPv4 or IPv6 datalen = len(data) rd = RouteDistinguisher.unpack(data[:8]) data = data[8:] esi = ESI.unpack(data[:10]) data = data[10:] etag = EthernetTag.unpack(data[:4]) data = data[4:] iplen = ord_(data[0]) data = data[1:] if datalen == (26 + 8): # Using IPv4 addresses ip = IP.unpack(data[:4]) data = data[4:] gwip = IP.unpack(data[:4]) data = data[4:] elif datalen == (26 + 32): # Using IPv6 addresses ip = IP.unpack(data[:16]) data = data[16:] gwip = IP.unpack(data[:16]) data = data[16:] else: raise Notify(3,5,"Data field length is given as %d, but EVPN route currently support only IPv4 or IPv6(34 or 58)" % datalen) label = Labels.unpack(data[:3]) return cls(rd,esi,etag,label,ip,iplen,gwip,exdata)
def unpack (data, negotiated): communities = ExtendedCommunities() while data: if data and len(data) < 8: raise Notify(3,1,'could not decode extended community %s' % str([hex(ord_(_)) for _ in data])) communities.add(ExtendedCommunity.unpack(data[:8],negotiated)) data = data[8:] return communities
def decode (afi,bgp): mask = ord_(bgp[0]) size = CIDR.size(mask) if len(bgp) < size+1: raise Notify(3,10,'could not decode CIDR') return bgp[1:size+1] + padding(IP.length(afi)-size), mask
def pack (self, negotiated=None):
# XXX: no support for addpath yet
# We reset ext com flag bits from the first byte in the packed RT
# because in an RTC route these flags never appear.
if self.rt:
packedRT = self.rt.pack()
return pack("!BLB", len(self), self.origin, ord_(RTC.resetFlags(packedRT[0]))) + packedRT[1:]
return pack("!B",0)
def unpack (cls, data):
rd = RouteDistinguisher.unpack(data[:8])
etag = EthernetTag.unpack(data[8:12])
iplen = ord_(data[12])
if iplen not in (4*8,16*8):
raise Exception("IP len is %d, but EVPN route currently support only IPv4" % iplen)
ip = IP.unpack(data[13:13+iplen//8])
return cls(rd,etag,ip,data)
def pack(self, negotiated=None):
# XXX: no support for addpath yet
# We reset ext com flag bits from the first byte in the packed RT
# because in an RTC route these flags never appear.
if self.rt:
packedRT = self.rt.pack()
return pack("!BLB", len(self), self.origin,
ord_(RTC.resetFlags(packedRT[0]))) + packedRT[1:]
return pack("!B", 0)
def unpack_capability (instance, data, capability=None): # pylint: disable=W0613 # XXX: FIXME: should check that we have not yet seen the capability while data: afi = AFI.unpack(data[:2]) safi = SAFI.unpack(data[2]) sr = ord_(data[3]) instance.add_path(afi,safi,sr) data = data[4:] return instance
def unpack(data, negotiated):
communities = ExtendedCommunities()
while data:
if data and len(data) < 8:
raise Notify(
3, 1, 'could not decode extended community %s' %
str([hex(ord_(_)) for _ in data]))
communities.add(ExtendedCommunity.unpack(data[:8], negotiated))
data = data[8:]
return communities
def unpack(data, negotiated):
communities = Communities()
while data:
if data and len(data) < 4:
raise Notify(
3, 1, 'could not decode community %s' %
str([hex(ord_(_)) for _ in data]))
communities.add(Community.unpack(data[:4], negotiated))
data = data[4:]
return communities
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:]
nlri.cidr = CIDR(network + padding(IP.length(afi) - size), mask)
return nlri, bgp
def unpack (data, negotiated): large_communities = LargeCommunities() while data: if data and len(data) < 12: raise Notify(3,1,'could not decode large community %s' % str([hex(ord_(_)) for _ in data])) lc = LargeCommunity.unpack(data[:12],negotiated) data = data[12:] if lc in large_communities.communities: continue large_communities.add(lc) return large_communities
def unpack (cls, data): rd = RouteDistinguisher.unpack(data[:8]) esi = ESI.unpack(data[8:18]) iplen = ord_(data[18]) if iplen not in (32,128): raise Notify(3,5,"IP length field is given as %d in current Segment, expecting 32 (IPv4) or 128 (IPv6) bits" % iplen) ip = IP.unpack(data[19:19+(iplen/8)]) return cls(rd,esi,ip,data)
def unpack(data, negotiated):
large_communities = LargeCommunities()
while data:
if data and len(data) < 12:
raise Notify(
3, 1, 'could not decode large community %s' %
str([hex(ord_(_)) for _ in data]))
lc = LargeCommunity.unpack(data[:12], negotiated)
data = data[12:]
if lc in large_communities.communities:
continue
large_communities.add(lc)
return large_communities
def unpack (cls, data): datalen = len(data) rd = RouteDistinguisher.unpack(data[:8]) esi = ESI.unpack(data[8:18]) etag = EthernetTag.unpack(data[18:22]) maclength = ord_(data[22]) if (maclength > 48 or maclength < 0): raise Notify(3,5,'invalid MAC Address length in %s' % cls.NAME) end = 23 + 6 # MAC length MUST be 6 mac = MACQUAL.unpack(data[23:end]) length = ord_(data[end]) iplen = length / 8 if datalen in [33,36]: # No IP information (1 or 2 labels) iplenUnpack = 0 if iplen != 0: raise Notify(3,5,"IP length is given as %d, but current MAC route has no IP information" % iplen) elif datalen in [37, 40]: # Using IPv4 addresses (1 or 2 labels) iplenUnpack = 4 if (iplen > 32 or iplen < 0): raise Notify(3,5,"IP field length is given as %d, but current MAC route is IPv4 and valus is out of range" % iplen) elif datalen in [49, 52]: # Using IPv6 addresses (1 or 2 labels) iplenUnpack = 16 if (iplen > 128 or iplen < 0): raise Notify(3,5,"IP field length is given as %d, but current MAC route is IPv6 and valus is out of range" % iplen) else: raise Notify(3,5,"Data field length is given as %d, but does not match one of the expected lengths" % datalen) payload = data[end+1:end+1+iplenUnpack] if payload: ip = IP.unpack(data[end+1:end+1+iplenUnpack]) else: ip = None label = Labels.unpack(data[end+1+iplenUnpack:end+1+iplenUnpack+3]) return cls(rd,esi,etag,mac,maclength,label,ip,data)
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 and SAFI %d' % (afi,safi))
network,bgp = bgp[:size],bgp[size:]
nlri.cidr = CIDR(network + padding(IP.length(afi)-size),mask)
return nlri,bgp
def unpack(cls, data):
rd = RouteDistinguisher.unpack(data[:8])
esi = ESI.unpack(data[8:18])
iplen = ord_(data[18])
if iplen not in (32, 128):
raise Notify(
3, 5,
"IP field length is given as %d in current Segment, expecting 32 (IPv4) or 128 (IPv6) bits"
% iplen)
ip = IP.unpack(data[19:19 + (iplen / 8)])
return cls(rd, esi, ip, data)
def unpack_capability (instance, data, capability=None): # pylint: disable=W0613
# XXX: FIXME: should raise if instance was already setup
restart = unpack('!H',data[:2])[0]
restart_flag = restart >> 12
restart_time = restart & Graceful.TIME_MASK
data = data[2:]
families = []
while data:
afi = AFI.unpack(data[:2])
safi = SAFI.unpack(data[2])
flag_family = ord_(data[3])
families.append((afi,safi,flag_family))
data = data[4:]
return instance.set(restart_flag,restart_time,families)
def unpack_message (cls, data, _=None):
version = ord_(data[0])
if version != 4:
# Only version 4 is supported nowdays..
raise Notify(2,1,data[0])
asn = unpack('!H',data[1:3])[0]
hold_time = unpack('!H',data[3:5])[0]
numeric = unpack('!L',data[5:9])[0]
router_id = "%d.%d.%d.%d" % (numeric >> 24,(numeric >> 16) & 0xFF,(numeric >> 8) & 0xFF,numeric & 0xFF)
return cls(
Version(version),
ASN(asn),
HoldTime(hold_time),
RouterID(router_id),
Capabilities.unpack(data[9:])
)
def unpack_nlri(cls, afi, safi, bgp, action, addpath):
length = ord_(bgp[0])
if length == 0:
return cls(afi, safi, action, ASN(0), None), bgp[1:]
if length < 8 * 4:
raise Exception("incorrect RT lenght: %d (should be >=32,<=96)" %
length)
# We are reseting the flags on the RouteTarget extended
# community, because they do not make sense for an RTC route
return cls(afi, safi, action, ASN(unpack('!L', bgp[1:5])[0]),
RouteTarget.unpack(RTC.resetFlags(bgp[5]) +
bgp[6:13])), bgp[13:]
def __init__(self, code, subcode, data=b''):
self.code = code
self.subcode = subcode
if not (code, subcode) in [(6, 2), (6, 4)]:
self.data = data if not len(
[_ for _ in data
if _ not in string.printable]) else hexstring(data)
return
if len(data) == 0:
# shutdown without shutdown communication (the old fashioned way)
self.data = b''
return
# draft-ietf-idr-shutdown or the peer was using 6,2 with data
shutdown_length = ord_(data[0])
data = data[1:]
if shutdown_length == 0:
self.data = "empty Shutdown Communication."
# move offset past length field
return
if len(data) < shutdown_length:
self.data = "invalid Shutdown Communication (buffer underrun) length : %i [%s]" % (
shutdown_length, hexstring(data))
return
if shutdown_length > 128:
self.data = "invalid Shutdown Communication (too large) length : %i [%s]" % (
shutdown_length, hexstring(data))
return
try:
self.data = 'Shutdown Communication: "%s"' % \
data[:shutdown_length].decode('utf-8').replace('\r',' ').replace('\n',' ')
except UnicodeDecodeError:
self.data = "invalid Shutdown Communication (invalid UTF-8) length : %i [%s]" % (
shutdown_length, hexstring(data))
return
trailer = data[shutdown_length:]
if trailer:
self.data += ", trailing data: " + hexstring(trailer)
def unpack_nlri (cls, afi, safi, bgp, action, addpath):
length = ord_(bgp[0])
if length == 0:
return cls(afi,safi,action,ASN(0),None),bgp[1:]
if length < 8*4:
raise Exception("incorrect RT length: %d (should be >=32,<=96)" % length)
# We are reseting the flags on the RouteTarget extended
# community, because they do not make sense for an RTC route
return cls(
afi, safi, action,
ASN(unpack('!L', bgp[1:5])[0]),
RouteTarget.unpack(
RTC.resetFlags(bgp[5])+bgp[6:13]
)
),bgp[13:]
def __init__ (self, code, subcode, data=b''):
self.code = code
self.subcode = subcode
if not (code, subcode) in [(6, 2), (6, 4)]:
self.data = data if not len([_ for _ in data if _ not in string.printable]) else hexstring(data)
return
if len(data) == 0:
# shutdown without shutdown communication (the old fashioned way)
self.data = b''
return
# draft-ietf-idr-shutdown or the peer was using 6,2 with data
shutdown_length = ord_(data[0])
data = data[1:]
if shutdown_length == 0:
self.data = "empty Shutdown Communication."
# move offset past length field
return
if len(data) < shutdown_length:
self.data = "invalid Shutdown Communication (buffer underrun) length : %i [%s]" % (shutdown_length, hexstring(data))
return
if shutdown_length > 128:
self.data = "invalid Shutdown Communication (too large) length : %i [%s]" % (shutdown_length, hexstring(data))
return
try:
self.data = 'Shutdown Communication: "%s"' % \
data[:shutdown_length].decode('utf-8').replace('\r',' ').replace('\n',' ')
except UnicodeDecodeError:
self.data = "invalid Shutdown Communication (invalid UTF-8) length : %i [%s]" % (shutdown_length, hexstring(data))
return
trailer = data[shutdown_length:]
if trailer:
self.data += ", trailing data: " + hexstring(trailer)
def unpack(cls, exdata):
data = exdata
# Get the data length to understand if addresses are IPv4 or IPv6
datalen = len(data)
rd = RouteDistinguisher.unpack(data[:8])
data = data[8:]
esi = ESI.unpack(data[:10])
data = data[10:]
etag = EthernetTag.unpack(data[:4])
data = data[4:]
iplen = ord_(data[0])
data = data[1:]
if datalen == (26 + 8): # Using IPv4 addresses
ip = IP.unpack(data[:4])
data = data[4:]
gwip = IP.unpack(data[:4])
data = data[4:]
elif datalen == (26 + 32): # Using IPv6 addresses
ip = IP.unpack(data[:16])
data = data[16:]
gwip = IP.unpack(data[:16])
data = data[16:]
else:
raise Notify(
3, 5,
"Data field length is given as %d, but EVPN route currently support only IPv4 or IPv6(34 or 58)"
% datalen)
label = Labels.unpack(data[:3])
return cls(rd, esi, etag, label, ip, iplen, gwip, exdata)
def __str__ (self):
return "evpn:%s:%s" % (self.registered_evpn.get(self.CODE,self).SHORT_NAME.lower(),'0x' + ''.join('%02x' % ord_(_) for _ in self._packed))
def unpack (data, negotiated=None): # 30/02/12 Quagga communities for soo and rt are not transitive when 4360 says they must be, hence the & 0x0FFF community = (ord_(data[0]) & 0x0F,ord_(data[1])) if community in ExtendedCommunity.registered_extended: return ExtendedCommunity.registered_extended[community].unpack(data) return ExtendedCommunity(data)
def __repr__(self):
return '0x' + ''.join('%02x' % ord_(_) for _ in self.data)
def __str__(self):
return ':'.join('%02X' % ord_(_) for _ in self._packed)
def unpack (cls, data, negotiated): return cls(ord_(data),data)
def resetFlags(char):
return chr_(
ord_(char)
& ~(Attribute.Flag.TRANSITIVE | Attribute.Flag.OPTIONAL))
def hex(data):
return '0x' + b''.join('%02x' % ord_(_) for _ in data)
def resetFlags(char): return chr_(ord_(char) & ~(Attribute.Flag.TRANSITIVE | Attribute.Flag.OPTIONAL))
def __str__(self):
return "evpn:%s:%s" % (self.registered_evpn.get(
self.CODE,
self).SHORT_NAME.lower(), '0x' + ''.join('%02x' % ord_(_)
for _ in self._packed))
def prettytunnel (self):
return "0x" + ''.join('%02X' % ord_(_) for _ in self.tunnel) if self.tunnel else ''
def _raw (self):
return ''.join('%02X' % ord_(_) for _ in self.pack())
def __repr__ (self):
return '0x' + ''.join('%02x' % ord_(_) for _ in self.data)
def json (self): h = 0x00 for byte in self.community: h <<= 8 h += ord_(byte) return "%ld" % h
def unpack (cls, data, negotiated):
nlris = []
# -- Reading AFI/SAFI
afi,safi = unpack('!HB',data[:3])
offset = 3
# we do not want to accept unknown families
if negotiated and (afi,safi) not in negotiated.families:
raise Notify(3,0,'presented a non-negotiated family %d/%d' % (afi,safi))
# -- Reading length of next-hop
len_nh = ord_(data[offset])
offset += 1
rd = 0
# check next-hop size
if afi == AFI.ipv4:
if safi in (SAFI.unicast,SAFI.multicast):
if len_nh != 4:
raise Notify(3,0,'invalid ipv4 unicast/multicast next-hop length %d expected 4' % len_nh)
elif safi in (SAFI.mpls_vpn,):
if len_nh != 12:
raise Notify(3,0,'invalid ipv4 mpls_vpn next-hop length %d expected 12' % len_nh)
rd = 8
elif safi in (SAFI.flow_ip,):
if len_nh not in (0,4):
raise Notify(3,0,'invalid ipv4 flow_ip next-hop length %d expected 4' % len_nh)
elif safi in (SAFI.flow_vpn,):
if len_nh not in (0,4):
raise Notify(3,0,'invalid ipv4 flow_vpn next-hop length %d expected 4' % len_nh)
elif safi in (SAFI.rtc,):
if len_nh not in (4,16):
raise Notify(3,0,'invalid ipv4 rtc next-hop length %d expected 4' % len_nh)
elif afi == AFI.ipv6:
if safi in (SAFI.unicast,):
if len_nh not in (16,32):
raise Notify(3,0,'invalid ipv6 unicast next-hop length %d expected 16 or 32' % len_nh)
elif safi in (SAFI.mpls_vpn,):
if len_nh not in (24,40):
raise Notify(3,0,'invalid ipv6 mpls_vpn next-hop length %d expected 24 or 40' % len_nh)
rd = 8
elif safi in (SAFI.flow_ip,):
if len_nh not in (0,16,32):
raise Notify(3,0,'invalid ipv6 flow_ip next-hop length %d expected 0, 16 or 32' % len_nh)
elif safi in (SAFI.flow_vpn,):
if len_nh not in (0,16,32):
raise Notify(3,0,'invalid ipv6 flow_vpn next-hop length %d expected 0, 16 or 32' % len_nh)
elif afi == AFI.l2vpn:
if len_nh != 4:
Notify(3,0,'invalid l2vpn next-hop length %d expected 4' % len_nh)
elif afi == AFI.bgpls:
if len_nh != 4:
Notify(3,0,'invalid bgpls next-hop length %d expected 4' % len_nh)
size = len_nh - rd
# XXX: FIXME: GET IT FROM CACHE HERE ?
nhs = data[offset+rd:offset+rd+size]
nexthops = [nhs[pos:pos+16] for pos in range(0,len(nhs),16)]
# chech the RD is well zero
if rd and sum([int(ord_(_)) for _ in data[offset:8]]) != 0:
raise Notify(3,0,"MP_REACH_NLRI next-hop's route-distinguisher must be zero")
offset += len_nh
# Skip a reserved bit as somone had to bug us !
reserved = ord_(data[offset])
offset += 1
if reserved != 0:
raise Notify(3,0,'the reserved bit of MP_REACH_NLRI is not zero')
# Is the peer going to send us some Path Information with the route (AddPath)
addpath = negotiated.addpath.receive(afi,safi)
# Reading the NLRIs
data = data[offset:]
if not data:
raise Notify(3,0,'No data to decode in an MPREACHNLRI but it is not an EOR %d/%d' % (afi,safi))
while data:
if nexthops:
for nexthop in nexthops:
nlri,left = NLRI.unpack_nlri(afi,safi,data,IN.ANNOUNCED,addpath)
nlri.nexthop = NextHop.unpack(nexthop)
nlris.append(nlri)
else:
nlri,left = NLRI.unpack_nlri(afi,safi,data,IN.ANNOUNCED,addpath)
nlris.append(nlri)
if left == data:
raise RuntimeError("sub-calls should consume data")
# logger.parser(LazyFormat("parsed announce mp nlri %s payload " % nlri,data[:length]))
data = left
return cls(afi,safi,nlris)
def __repr__ (self): h = 0x00 for byte in self.community: h <<= 8 h += ord_(byte) return "0x%016X" % h
def _raw(self):
return ''.join('%02X' % ord_(_) for _ in self.pack())
def unpack (cls, data):
return cls(':'.join('%02X' % ord_(_) for _ in data[:6]),data[:6])
def __str__ (self):
return ':'.join('%02X' % ord_(_) for _ in self._packed)
def unpack(cls, data, negotiated):
if data:
raise Notify(
3, 2,
'invalid ATOMIC_AGGREGATE %s' % [hex(ord_(_)) for _ in data])
return cls()
