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 unpack(cls, data, negotiated):
nlris = []
# -- Reading AFI/SAFI
_afi, _safi = unpack('!HB', data[:3])
afi, safi = AFI.create(_afi), SAFI.create(_safi)
offset = 3
nh_afi = afi
# 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 %s/%s' % (afi, safi))
# -- Reading length of next-hop
len_nh = ordinal(data[offset])
offset += 1
if (afi, safi) not in Family.size:
raise Notify(3, 0, 'unsupported %s %s' % (afi, safi))
length, rd = Family.size[(afi, safi)]
if negotiated.nexthop:
if len_nh in (16, 32):
nh_afi = AFI.ipv6
elif len_nh in (4, ):
nh_afi = AFI.ipv4
else:
raise Notify(
3, 0,
'unsupported family %s %s with extended next-hop capability enabled'
% (afi, safi))
length, _ = Family.size[(nh_afi, safi)]
if len_nh not in length:
raise Notify(
3, 0, 'invalid %s %s next-hop length %d expected %s' %
(afi, safi, len_nh, ' or '.join(str(_) for _ in length)))
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(ordinal(_)) 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 = ordinal(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)
# allow unpack_nlri to return none for "treat as withdraw" controlled by NLRI.unpack_nlri
if nlri:
nlri.nexthop = NextHop.unpack(nexthop)
nlris.append(nlri)
else:
nlri, left = NLRI.unpack_nlri(afi, safi, data, IN.ANNOUNCED,
addpath)
# allow unpack_nlri to return none for "treat as withdraw" controlled by NLRI.unpack_nlri
if nlri:
nlris.append(nlri)
if left == data:
raise RuntimeError("sub-calls should consume data")
data = left
return cls(afi, safi, nlris)
def unpack (cls, data, negotiated):
nlris = []
# -- Reading AFI/SAFI
_afi,_safi = unpack('!HB',data[:3])
afi,safi = AFI.create(_afi),SAFI.create(_safi)
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 %s/%s' % (afi,safi))
# -- Reading length of next-hop
len_nh = ordinal(data[offset])
offset += 1
if (afi,safi) not in Family.size:
raise Notify(3,0,'unsupported %s %s' % (afi,safi))
length,rd = Family.size[(afi,safi)]
if len_nh not in length:
raise Notify(3,0,'invalid %s %s next-hop length %d expected %s' % (afi,safi,len_nh,' or '.join(str(_) for _ in length)))
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(ordinal(_)) 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 = ordinal(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")
data = left
return cls(afi,safi,nlris)
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 = ordinal(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(ordinal(_)) 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 = ordinal(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)