def do_build(self):
_cur = self
if isinstance(_cur.payload, LoWPAN_NHC):
_cur = _cur.payload
if not isinstance(_cur.payload, IPv6):
return Packet.do_build(self)
ipv6 = _cur.payload
self._reserved = 0x03
# NEW COMPRESSION TECHNIQUE!
# a ) Compression Techniques
# 1. Set Traffic Class
if self.tf == 0x0:
self.tc_ecn = ipv6.tc >> 6
self.tc_dscp = ipv6.tc & 0x3F
self.flowlabel = ipv6.fl
elif self.tf == 0x1:
self.tc_ecn = ipv6.tc >> 6
self.flowlabel = ipv6.fl
elif self.tf == 0x2:
self.tc_ecn = ipv6.tc >> 6
self.tc_dscp = ipv6.tc & 0x3F
else: # self.tf == 0x3:
pass # no field is set
# 2. Next Header
if self.nh == 0x0:
self.nhField = ipv6.nh
elif self.nh == 1:
# This will be handled in LoWPAN_NHC
pass
# 3. HLim
if self.hlim == 0x0:
self.hopLimit = ipv6.hlim
else: # if hlim is 1, 2 or 3, there are nothing to do!
pass
# 4. Context (which context to use...)
if self.cid == 0x0:
pass
else:
# TODO: Context Unimplemented yet
pass
# 5. Compress Source Addr
self.compressSourceAddr(ipv6)
self.compressDestAddr(ipv6)
return Packet.do_build(self)
def do_build(self):
if not isinstance(self.payload, IPv6):
return Packet.do_build(self)
ipv6 = self.payload
self._reserved = 0x03
# NEW COMPRESSION TECHNIQUE!
# a ) Compression Techniques
# 1. Set Traffic Class
if self.tf == 0x0:
self.tc_ecn = ipv6.tc >> 6
self.tc_dscp = ipv6.tc & 0x3F
self.flowlabel = ipv6.fl
elif self.tf == 0x1:
self.tc_ecn = ipv6.tc >> 6
self.flowlabel = ipv6.fl
elif self.tf == 0x2:
self.tc_ecn = ipv6.tc >> 6
self.tc_dscp = ipv6.tc & 0x3F
else: # self.tf == 0x3:
pass # no field is set
# 2. Next Header
if self.nh == 0x0:
self.nh = 0 # ipv6.nh
elif self.nh == 0x1:
self.nh = 0 # disable compression
# The Next Header field is compressed and the next header is encoded using LOWPAN_NHC, which is discussed in Section 4.1. # noqa: E501
warning(
'Next header compression is not implemented yet ! Will be ignored'
) # noqa: E501
# 3. HLim
if self.hlim == 0x0:
self._hopLimit = ipv6.hlim
else: # if hlim is 1, 2 or 3, there are nothing to do!
pass
# 4. Context (which context to use...)
if self.cid == 0x0:
pass
else:
# TODO: Context Unimplemented yet in my class
self._contextIdentifierExtension = 0
# 5. Compress Source Addr
self.compressSourceAddr(ipv6)
self.compressDestinyAddr(ipv6)
return Packet.do_build(self)
def do_build(self):
if not isinstance(self.payload, IPv6):
return Packet.do_build(self)
ipv6 = self.payload
self._reserved = 0x03
# NEW COMPRESSION TECHNIQUE!
# a ) Compression Techniques
# 1. Set Traffic Class
if self.tf == 0x0:
self.tc_ecn = ipv6.tc >> 6
self.tc_dscp = ipv6.tc & 0x3F
self.flowlabel = ipv6.fl
elif self.tf == 0x1:
self.tc_ecn = ipv6.tc >> 6
self.flowlabel = ipv6.fl
elif self.tf == 0x2:
self.tc_ecn = ipv6.tc >> 6
self.tc_dscp = ipv6.tc & 0x3F
else: # self.tf == 0x3:
pass # no field is set
# 2. Next Header
if self.nh == 0x0:
self.nh = 0 # ipv6.nh
elif self.nh == 0x1:
self.nh = 0 # disable compression
# The Next Header field is compressed and the next header is encoded using LOWPAN_NHC, which is discussed in Section 4.1. # noqa: E501
warning('Next header compression is not implemented yet ! Will be ignored') # noqa: E501
# 3. HLim
if self.hlim == 0x0:
self._hopLimit = ipv6.hlim
else: # if hlim is 1, 2 or 3, there are nothing to do!
pass
# 4. Context (which context to use...)
if self.cid == 0x0:
pass
else:
# TODO: Context Unimplemented yet in my class
self._contextIdentifierExtension = 0
# 5. Compress Source Addr
self.compressSourceAddr(ipv6)
self.compressDestinyAddr(ipv6)
return Packet.do_build(self)
def do_build(self):
if not isinstance(self.payload, IPv6):
return Packet.do_build(self)
pay = self.payload.payload
while pay and isinstance(pay.payload, _IPv6ExtHdr):
# XXX todo: populate a LoWPAN_NHC_IPv6Ext
pay = pay.payload
if isinstance(pay, UDP):
try:
udp_hdr = next(
x for x in self.exts if isinstance(x, LoWPAN_NHC_UDP)
)
except StopIteration:
udp_hdr = LoWPAN_NHC_UDP()
# Guess best compression
if pay.sport >> 4 == 0xf0b and pay.dport >> 4 == 0xf0b:
udp_hdr.P = 3
elif pay.sport >> 8 == 0xf0:
udp_hdr.P = 2
elif pay.dport >> 8 == 0xf0:
udp_hdr.P = 1
self.exts.insert(0, udp_hdr)
# https://tools.ietf.org/html/rfc6282#section-4.3.3
if udp_hdr.P == 0:
udp_hdr.udpSourcePort = pay.sport
udp_hdr.udpDestPort = pay.dport
elif udp_hdr.P == 1:
udp_hdr.udpSourcePort = pay.sport
udp_hdr.udpDestPort = pay.dport & 255
elif udp_hdr.P == 2:
udp_hdr.udpSourcePort = pay.sport & 255
udp_hdr.udpDestPort = pay.dport
elif udp_hdr.P == 3:
udp_hdr.udpSourcePort = pay.sport & 15
udp_hdr.udpDestPort = pay.dport & 15
if udp_hdr.C == 0:
if pay.chksum:
udp_hdr.udpChecksum = pay.chksum
else:
udp_hdr.udpChecksum = UDP(raw(pay)).chksum
return Packet.do_build(self)
def do_build(self):
if not isinstance(self.payload, IPv6):
return Packet.do_build(self)
# IPv6
ipv6 = self.payload
self.src = ipv6.src
self.dst = ipv6.dst
self.flow_label = ipv6.fl
self.traffic_class = ipv6.tc
self.hopLimit = ipv6.hlim
if isinstance(ipv6.payload, UDP):
self.nh = 1
self.hc2 = 1
udp = ipv6.payload
self.udpSourcePort = udp.sport
self.udpDestPort = udp.dport
if not udp.len or not udp.chksum:
udp = UDP(raw(udp))
self.udpLength = udp.len
self.udpChecksum = udp.chksum
return Packet.do_build(self)
def do_build(self):
self.delta_ext, self.delta = self._populate_extended(self.delta)
self.len_ext, self.len = self._populate_extended(len(self.opt_val))
return Packet.do_build(self)
def do_build(self):
self.delta_ext, self.delta = self._populate_extended(self.delta)
self.len_ext, self.len = self._populate_extended(len(self.opt_val))
return Packet.do_build(self)
