#!/usr/bin/env python
# scapy.contrib.description = OSPF
# scapy.contrib.status = loads
"""
OSPF extension for Scapy <http://www.secdev.org/scapy>
This module provides Scapy layers for the Open Shortest Path First
routing protocol as defined in RFC 2328 and RFC 5340.
Copyright (c) 2008 Dirk Loss : mail dirk-loss de
Copyright (c) 2010 Jochen Bartl : jochen.bartl gmail com
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
"""
from scapy.all import *
EXT_VERSION = "v0.9.2"
class OSPFOptionsField(FlagsField):
def __init__(self, name="options", default=0, size=8,
names=["MT", "E", "MC", "NP", "L", "DC", "O", "DN"]):
FlagsField.__init__(self, name, default, size, names)
_OSPF_types = {1: "Hello",
2: "DBDesc",
3: "LSReq",
4: "LSUpd",
5: "LSAck"}
class OSPF_Hdr(Packet):
name = "OSPF Header"
fields_desc = [
ByteField("version", 2),
ByteEnumField("type", 1, _OSPF_types),
ShortField("len", None),
IPField("src", "1.1.1.1"),
IPField("area", "0.0.0.0"), # default: backbone
XShortField("chksum", None),
ShortEnumField("authtype", 0, {0:"Null", 1:"Simple", 2:"Crypto"}),
# Null or Simple Authentication
ConditionalField(XLongField("authdata", 0), lambda pkt:pkt.authtype != 2),
# Crypto Authentication
ConditionalField(XShortField("reserved", 0), lambda pkt:pkt.authtype == 2),
ConditionalField(ByteField("keyid", 1), lambda pkt:pkt.authtype == 2),
ConditionalField(ByteField("authdatalen", 0), lambda pkt:pkt.authtype == 2),
ConditionalField(XIntField("seq", 0), lambda pkt:pkt.authtype == 2),
# TODO: Support authdata (which is appended to the packets as if it were padding)
]
def post_build(self, p, pay):
# TODO: Remove LLS data from pay
# LLS data blocks may be attached to OSPF Hello and DD packets
# The length of the LLS block shall not be included into the length of OSPF packet
# See <http://tools.ietf.org/html/rfc5613>
p += pay
l = self.len
if l is None:
l = len(p)
p = p[:2] + struct.pack("!H", l) + p[4:]
if self.chksum is None:
if self.authtype == 2:
ck = 0 # Crypto, see RFC 2328, D.4.3
else:
# Checksum is calculated without authentication data
# Algorithm is the same as in IP()
ck = checksum(p[:16] + p[24:])
p = p[:12] + chr(ck >> 8) + chr(ck & 0xff) + p[14:]
# TODO: Handle Crypto: Add message digest (RFC 2328, D.4.3)
return p
def hashret(self):
return struct.pack("H", self.area) + self.payload.hashret()
def answers(self, other):
if (isinstance(other, OSPF_Hdr) and
self.area == other.area and
self.type == 5): # Only acknowledgements answer other packets
return self.payload.answers(other.payload)
return 0
class OSPF_Hello(Packet):
name = "OSPF Hello"
fields_desc = [IPField("mask", "255.255.255.0"),
ShortField("hellointerval", 10),
OSPFOptionsField(),
ByteField("prio", 1),
IntField("deadinterval", 40),
IPField("router", "0.0.0.0"),
IPField("backup", "0.0.0.0"),
FieldListField("neighbors", [], IPField("", "0.0.0.0"), length_from=lambda pkt: (pkt.underlayer.len - 44))]
def guess_payload_class(self, payload):
# check presence of LLS data block flag
if self.options & 0x10 == 0x10:
return OSPF_LLS_Hdr
else:
return Packet.guess_payload_class(self, payload)
class LLS_Generic_TLV(Packet):
name = "LLS Generic"
fields_desc = [ShortField("type", 1),
FieldLenField("len", None, length_of=lambda x: x.val),
StrLenField("val", "", length_from=lambda x: x.len)]
def guess_payload_class(self, p):
return conf.padding_layer
class LLS_ExtendedOptionsField(FlagsField):
def __init__(self, name="options", default=0, size=32,
names=["LR", "RS"]):
FlagsField.__init__(self, name, default, size, names)
class LLS_Extended_Options(LLS_Generic_TLV):
name = "LLS Extended Options and Flags"
fields_desc = [ShortField("type", 1),
ShortField("len", 4),
LLS_ExtendedOptionsField()]
class LLS_Crypto_Auth(LLS_Generic_TLV):
name = "LLS Cryptographic Authentication"
fields_desc = [ShortField("type", 2),
FieldLenField("len", 20, fmt="B", length_of=lambda x: x.authdata),
XIntField("sequence", "\x00\x00\x00\x00"),
StrLenField("authdata", "\x00" * 16, length_from=lambda x: x.len)]
def post_build(self, p, pay):
p += pay
l = self.len
if l is None:
# length = len(sequence) + len(authdata) + len(payload)
l = len(p[3:])
p = p[:2] + struct.pack("!H", l) + p[3:]
return p
_OSPF_LLSclasses = {1: "LLS_Extended_Options",
2: "LLS_Crypto_Auth"}
def _LLSGuessPayloadClass(p, **kargs):
""" Guess the correct LLS class for a given payload """
cls = conf.raw_layer
if len(p) >= 4:
typ = struct.unpack("!H", p[0:2])[0]
clsname = _OSPF_LLSclasses.get(typ, "LLS_Generic_TLV")
cls = globals()[clsname]
return cls(p, **kargs)
class OSPF_LLS_Hdr(Packet):
name = "OSPF Link-local signaling"
fields_desc = [XShortField("chksum", None),
# FIXME Length should be displayed in 32-bit words
ShortField("len", None),
PacketListField("llstlv", [], _LLSGuessPayloadClass)]
def post_build(self, p, pay):
p += pay
l = self.len
if l is None:
# Length in 32-bit words
l = len(p) / 4
p = p[:2] + struct.pack("!H", l) + p[4:]
if self.chksum is None:
c = checksum(p)
p = chr((c >> 8) & 0xff) + chr(c & 0xff) + p[2:]
return p
_OSPF_LStypes = {1: "router",
2: "network",
3: "summaryIP",
4: "summaryASBR",
5: "external",
7: "NSSAexternal"}
_OSPF_LSclasses = {1: "OSPF_Router_LSA",
2: "OSPF_Network_LSA",
3: "OSPF_SummaryIP_LSA",
4: "OSPF_SummaryASBR_LSA",
5: "OSPF_External_LSA",
7: "OSPF_NSSA_External_LSA"}
def ospf_lsa_checksum(lsa):
""" Fletcher checksum for OSPF LSAs, returned as a 2 byte string.
Give the whole LSA packet as argument.
For details on the algorithm, see RFC 2328 chapter 12.1.7 and RFC 905 Annex B.
"""
# This is based on the GPLed C implementation in Zebra <http://www.zebra.org/>
CHKSUM_OFFSET = 16
if len(lsa) < CHKSUM_OFFSET:
raise Exception("LSA Packet too short (%s bytes)" % len(lsa))
c0 = c1 = 0
# Calculation is done with checksum set to zero
lsa = lsa[:CHKSUM_OFFSET] + "\x00\x00" + lsa[CHKSUM_OFFSET + 2:]
for char in lsa[2:]: # leave out age
c0 += ord(char)
c1 += c0
c0 %= 255
c1 %= 255
x = ((len(lsa) - CHKSUM_OFFSET - 1) * c0 - c1) % 255
if (x <= 0):
x += 255
y = 510 - c0 - x
if (y > 255):
y -= 255
#checksum = (x << 8) + y
return chr(x) + chr(y)
class OSPF_LSA_Hdr(Packet):
name = "OSPF LSA Header"
fields_desc = [ShortField("age", 1),
OSPFOptionsField(),
ByteEnumField("type", 1, _OSPF_LStypes),
IPField("id", "192.168.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", 0),
ShortField("len", 36)]
def extract_padding(self, s):
return "", s
_OSPF_Router_LSA_types = {1: "p2p",
2: "transit",
3: "stub",
4: "virtual"}
class OSPF_Link(Packet):
name = "OSPF Link"
fields_desc = [IPField("id", "192.168.0.0"),
IPField("data", "255.255.255.0"),
ByteEnumField("type", 3, _OSPF_Router_LSA_types),
ByteField("toscount", 0),
ShortField("metric", 10),
# TODO: define correct conditions
ConditionalField(ByteField("tos", 0), lambda pkt: False),
ConditionalField(ByteField("reserved", 0), lambda pkt: False),
ConditionalField(ShortField("tosmetric", 0), lambda pkt: False)]
def extract_padding(self, s):
return "", s
def _LSAGuessPayloadClass(p, **kargs):
""" Guess the correct LSA class for a given payload """
# This is heavily based on scapy-cdp.py by Nicolas Bareil and Arnaud Ebalard
# XXX: This only works if all payload
cls = conf.raw_layer
if len(p) >= 4:
typ = struct.unpack("!B", p[3])[0]
clsname = _OSPF_LSclasses.get(typ, "Raw")
cls = globals()[clsname]
return cls(p, **kargs)
class OSPF_BaseLSA(Packet):
""" An abstract base class for Link State Advertisements """
def post_build(self, p, pay):
length = self.len
if length is None:
length = len(p)
p = p[:18] + struct.pack("!H", length) + p[20:]
if self.chksum is None:
chksum = ospf_lsa_checksum(p)
p = p[:16] + chksum + p[18:]
return p # p+pay?
def extract_padding(self, s):
length = self.len
return "", s
class OSPF_Router_LSA(OSPF_BaseLSA):
name = "OSPF Router LSA"
fields_desc = [ShortField("age", 1),
OSPFOptionsField(),
ByteField("type", 1),
IPField("id", "1.1.1.1"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
FlagsField("flags", 0, 8, ["B", "E", "V", "W", "Nt"]),
ByteField("reserved", 0),
FieldLenField("linkcount", None, count_of="linklist"),
PacketListField("linklist", [], OSPF_Link,
count_from=lambda pkt: pkt.linkcount,
length_from=lambda pkt: pkt.linkcount * 12)]
class OSPF_Network_LSA(OSPF_BaseLSA):
name = "OSPF Network LSA"
fields_desc = [ShortField("age", 1),
OSPFOptionsField(),
ByteField("type", 2),
IPField("id", "192.168.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
IPField("mask", "255.255.255.0"),
FieldListField("routerlist", [], IPField("", "1.1.1.1"),
length_from=lambda pkt: pkt.len - 24)]
class OSPF_SummaryIP_LSA(OSPF_BaseLSA):
name = "OSPF Summary LSA (IP Network)"
fields_desc = [ShortField("age", 1),
OSPFOptionsField(),
ByteField("type", 3),
IPField("id", "192.168.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
IPField("mask", "255.255.255.0"),
ByteField("reserved", 0),
X3BytesField("metric", 10),
# TODO: Define correct conditions
ConditionalField(ByteField("tos", 0), lambda pkt:False),
ConditionalField(X3BytesField("tosmetric", 0), lambda pkt:False)]
class OSPF_SummaryASBR_LSA(OSPF_SummaryIP_LSA):
name = "OSPF Summary LSA (AS Boundary Router)"
type = 4
id = "2.2.2.2"
mask = "0.0.0.0"
metric = 20
class OSPF_External_LSA(OSPF_BaseLSA):
name = "OSPF External LSA (ASBR)"
fields_desc = [ShortField("age", 1),
OSPFOptionsField(),
ByteField("type", 5),
IPField("id", "192.168.0.0"),
IPField("adrouter", "2.2.2.2"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
IPField("mask", "255.255.255.0"),
FlagsField("ebit", 0, 1, ["E"]),
BitField("reserved", 0, 7),
X3BytesField("metric", 20),
IPField("fwdaddr", "0.0.0.0"),
XIntField("tag", 0),
# TODO: Define correct conditions
ConditionalField(ByteField("tos", 0), lambda pkt:False),
ConditionalField(X3BytesField("tosmetric", 0), lambda pkt:False)]
class OSPF_NSSA_External_LSA(OSPF_External_LSA):
name = "OSPF NSSA External LSA"
type = 7
class OSPF_DBDesc(Packet):
name = "OSPF Database Description"
fields_desc = [ShortField("mtu", 1500),
OSPFOptionsField(),
FlagsField("dbdescr", 0, 8, ["MS", "M", "I", "R", "4", "3", "2", "1"]),
IntField("ddseq", 1),
PacketListField("lsaheaders", None, OSPF_LSA_Hdr,
count_from = lambda pkt: None,
length_from = lambda pkt: pkt.underlayer.len - 24 - 8)]
def guess_payload_class(self, payload):
# check presence of LLS data block flag
if self.options & 0x10 == 0x10:
return OSPF_LLS_Hdr
else:
return Packet.guess_payload_class(self, payload)
class OSPF_LSReq_Item(Packet):
name = "OSPF Link State Request (item)"
fields_desc = [IntEnumField("type", 1, _OSPF_LStypes),
IPField("id", "1.1.1.1"),
IPField("adrouter", "1.1.1.1")]
def extract_padding(self, s):
return "", s
class OSPF_LSReq(Packet):
name = "OSPF Link State Request (container)"
fields_desc = [PacketListField("requests", None, OSPF_LSReq_Item,
count_from = lambda pkt:None,
length_from = lambda pkt:pkt.underlayer.len - 24)]
class OSPF_LSUpd(Packet):
name = "OSPF Link State Update"
fields_desc = [FieldLenField("lsacount", None, fmt="!I", count_of="lsalist"),
PacketListField("lsalist", [], _LSAGuessPayloadClass,
count_from = lambda pkt: pkt.lsacount,
length_from = lambda pkt: pkt.underlayer.len - 24)]
class OSPF_LSAck(Packet):
name = "OSPF Link State Acknowledgement"
fields_desc = [PacketListField("lsaheaders", None, OSPF_LSA_Hdr,
count_from = lambda pkt: None,
length_from = lambda pkt: pkt.underlayer.len - 24)]
def answers(self, other):
if isinstance(other, OSPF_LSUpd):
for reqLSA in other.lsalist:
for ackLSA in self.lsaheaders:
if (reqLSA.type == ackLSA.type and
reqLSA.seq == ackLSA.seq):
return 1
return 0
#------------------------------------------------------------------------------
# OSPFv3
#------------------------------------------------------------------------------
# TODO: Add length_from / adjust functionality to IP6Field and remove this class
class OspfIP6Field(StrField, IP6Field):
"""
Special IP6Field for prefix fields in OSPFv3 LSAs
"""
def __init__(self, name, default, length=None, length_from=None):
StrField.__init__(self, name, default)
self.length_from = length_from
if length is not None:
self.length_from = lambda pkt, length = length: length
def any2i(self, pkt, x):
return IP6Field.any2i(self, pkt, x)
def i2repr(self, pkt, x):
return IP6Field.i2repr(self, pkt, x)
def h2i(self, pkt, x):
return IP6Field.h2i(self, pkt, x)
def i2m(self, pkt, x):
x = inet_pton(socket.AF_INET6, x)
l = self.length_from(pkt)
l = self.prefixlen_to_bytelen(l)
return x[:l]
def m2i(self, pkt, x):
l = self.length_from(pkt)
prefixlen = self.prefixlen_to_bytelen(l)
if l > 128:
warning("OspfIP6Field: Prefix length is > 128. Dissection of this packet will fail")
else:
pad = "\x00" * (16 - prefixlen)
x += pad
return inet_ntop(socket.AF_INET6, x)
def prefixlen_to_bytelen(self, l):
if l <= 32:
return 4
elif l <= 64:
return 8
elif l <= 96:
return 12
else:
return 16
def i2len(self, pkt, x):
l = self.length_from(pkt)
l = self.prefixlen_to_bytelen(l)
return l
def getfield(self, pkt, s):
l = self.length_from(pkt)
l = self.prefixlen_to_bytelen(l)
return s[l:], self.m2i(pkt, s[:l])
class OSPFv3_Hdr(Packet):
name = "OSPFv3 Header"
fields_desc = [ByteField("version", 3),
ByteEnumField("type", 1, _OSPF_types),
ShortField("len", None),
IPField("src", "1.1.1.1"),
IPField("area", "0.0.0.0"),
XShortField("chksum", None),
ByteField("instance", 0),
ByteField("reserved", 0)]
def post_build(self, p, pay):
p += pay
l = self.len
if l is None:
l = len(p)
p = p[:2] + struct.pack("!H", l) + p[4:]
if self.chksum is None:
chksum = in6_chksum(89, self.underlayer, p)
p = p[:12] + chr(chksum >> 8) + chr(chksum & 0xff) + p[14:]
return p
class OSPFv3OptionsField(FlagsField):
def __init__(self, name="options", default=0, size=24,
names=["V6", "E", "MC", "N", "R", "DC", "AF", "L", "I", "F"]):
FlagsField.__init__(self, name, default, size, names)
class OSPFv3_Hello(Packet):
name = "OSPFv3 Hello"
fields_desc = [IntField("intid", 0),
ByteField("prio", 1),
OSPFv3OptionsField(),
ShortField("hellointerval", 10),
ShortField("deadinterval", 40),
IPField("router", "0.0.0.0"),
IPField("backup", "0.0.0.0"),
FieldListField("neighbors", [], IPField("", "0.0.0.0"),
length_from=lambda pkt: (pkt.underlayer.len - 36))]
_OSPFv3_LStypes = {0x2001: "router",
0x2002: "network",
0x2003: "interAreaPrefix",
0x2004: "interAreaRouter",
0x4005: "asExternal",
0x2007: "type7",
0x0008: "link",
0x2009: "intraAreaPrefix"}
_OSPFv3_LSclasses = {0x2001: "OSPFv3_Router_LSA",
0x2002: "OSPFv3_Network_LSA",
0x2003: "OSPFv3_Inter_Area_Prefix_LSA",
0x2004: "OSPFv3_Inter_Area_Router_LSA",
0x4005: "OSPFv3_AS_External_LSA",
0x2007: "OSPFv3_Type_7_LSA",
0x0008: "OSPFv3_Link_LSA",
0x2009: "OSPFv3_Intra_Area_Prefix_LSA"}
class OSPFv3_LSA_Hdr(Packet):
name = "OSPFv3 LSA Header"
fields_desc = [ShortField("age", 1),
ShortEnumField("type", 0x2001, _OSPFv3_LStypes),
IPField("id", "0.0.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", 0),
ShortField("len", 36)]
def extract_padding(self, s):
return "", s
def _OSPFv3_LSAGuessPayloadClass(p, **kargs):
""" Guess the correct OSPFv3 LSA class for a given payload """
cls = conf.raw_layer
if len(p) >= 6:
typ = struct.unpack("!H", p[2:4])[0]
clsname = _OSPFv3_LSclasses.get(typ, "Raw")
cls = globals()[clsname]
return cls(p, **kargs)
_OSPFv3_Router_LSA_types = {1: "p2p",
2: "transit",
3: "reserved",
4: "virtual"}
class OSPFv3_Link(Packet):
name = "OSPFv3 Link"
fields_desc = [ByteEnumField("type", 1, _OSPFv3_Router_LSA_types),
ByteField("reserved", 0),
ShortField("metric", 10),
IntField("intid", 0),
IntField("neighintid", 0),
IPField("neighbor", "2.2.2.2")]
def extract_padding(self, s):
return "", s
class OSPFv3_Router_LSA(OSPF_BaseLSA):
name = "OSPFv3 Router LSA"
fields_desc = [ShortField("age", 1),
ShortEnumField("type", 0x2001, _OSPFv3_LStypes),
IPField("id", "0.0.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
FlagsField("flags", 0, 8, ["B", "E", "V", "W"]),
OSPFv3OptionsField(),
PacketListField("linklist", [], OSPFv3_Link,
length_from=lambda pkt:pkt.len - 24)]
class OSPFv3_Network_LSA(OSPF_BaseLSA):
name = "OSPFv3 Network LSA"
fields_desc = [ShortField("age", 1),
ShortEnumField("type", 0x2002, _OSPFv3_LStypes),
IPField("id", "0.0.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
ByteField("reserved", 0),
OSPFv3OptionsField(),
FieldListField("routerlist", [], IPField("", "0.0.0.1"),
length_from=lambda pkt: pkt.len - 24)]
class OSPFv3PrefixOptionsField(FlagsField):
def __init__(self, name="prefixoptions", default=0, size=8,
names=["NU", "LA", "MC", "P"]):
FlagsField.__init__(self, name, default, size, names)
class OSPFv3_Inter_Area_Prefix_LSA(OSPF_BaseLSA):
name = "OSPFv3 Inter Area Prefix LSA"
fields_desc = [ShortField("age", 1),
ShortEnumField("type", 0x2003, _OSPFv3_LStypes),
IPField("id", "0.0.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
ByteField("reserved", 0),
X3BytesField("metric", 10),
ByteField("prefixlen", 64),
OSPFv3PrefixOptionsField(),
ShortField("reserved2", 0),
OspfIP6Field("prefix", "2001:db8:0:42::", length_from=lambda pkt: pkt.prefixlen)]
class OSPFv3_Inter_Area_Router_LSA(OSPF_BaseLSA):
name = "OSPFv3 Inter Area Router LSA"
fields_desc = [ShortField("age", 1),
ShortEnumField("type", 0x2004, _OSPFv3_LStypes),
IPField("id", "0.0.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
ByteField("reserved", 0),
X3BytesField("metric", 1),
IPField("router", "2.2.2.2")]
class OSPFv3_AS_External_LSA(OSPF_BaseLSA):
name = "OSPFv3 AS External LSA"
fields_desc = [ShortField("age", 1),
ShortEnumField("type", 0x4005, _OSPFv3_LStypes),
IPField("id", "0.0.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
FlagsField("flags", 0, 8, ["T", "F", "E"]),
X3BytesField("metric", 20),
ByteField("prefixlen", 64),
OSPFv3PrefixOptionsField(),
ShortEnumField("reflstype", 0, _OSPFv3_LStypes),
OspfIP6Field("prefix", "2001:db8:0:42::", length_from=lambda pkt: pkt.prefixlen),
ConditionalField(IP6Field("fwaddr", "::"), lambda pkt: pkt.flags & 0x02 == 0x02),
ConditionalField(IntField("tag", 0), lambda pkt: pkt.flags & 0x01 == 0x01),
ConditionalField(IPField("reflsid", 0), lambda pkt: pkt.reflstype != 0)]
class OSPFv3_Type_7_LSA(OSPFv3_AS_External_LSA):
name = "OSPFv3 Type 7 LSA"
type = 0x2007
class OSPFv3_Prefix_Item(Packet):
name = "OSPFv3 Link Prefix Item"
fields_desc = [ByteField("prefixlen", 64),
OSPFv3PrefixOptionsField(),
ShortField("metric", 10),
OspfIP6Field("prefix", "2001:db8:0:42::", length_from=lambda pkt: pkt.prefixlen)]
def extract_padding(self, s):
return "", s
class OSPFv3_Link_LSA(OSPF_BaseLSA):
name = "OSPFv3 Link LSA"
fields_desc = [ShortField("age", 1),
ShortEnumField("type", 0x0008, _OSPFv3_LStypes),
IPField("id", "0.0.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
ByteField("prio", 1),
OSPFv3OptionsField(),
IP6Field("lladdr", "fe80::"),
IntField("prefixes", 0),
PacketListField("prefixlist", None, OSPFv3_Prefix_Item,
count_from = lambda pkt: pkt.prefixes)]
class OSPFv3_Intra_Area_Prefix_LSA(OSPF_BaseLSA):
name = "OSPFv3 Intra Area Prefix LSA"
fields_desc = [ShortField("age", 1),
ShortEnumField("type", 0x2009, _OSPFv3_LStypes),
IPField("id", "0.0.0.0"),
IPField("adrouter", "1.1.1.1"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
ShortField("prefixes", 0),
ShortEnumField("reflstype", 0, _OSPFv3_LStypes),
IPField("reflsid", "0.0.0.0"),
IPField("refadrouter", "0.0.0.0"),
PacketListField("prefixlist", None, OSPFv3_Prefix_Item,
count_from = lambda pkt: pkt.prefixes)]
class OSPFv3_DBDesc(Packet):
name = "OSPFv3 Database Description"
fields_desc = [ByteField("reserved", 0),
OSPFv3OptionsField(),
ShortField("mtu", 1500),
ByteField("reserved2", 0),
FlagsField("dbdescr", 0, 8, ["MS", "M", "I", "R"]),
IntField("ddseq", 1),
PacketListField("lsaheaders", None, OSPFv3_LSA_Hdr,
count_from = lambda pkt:None,
length_from = lambda pkt:pkt.underlayer.len - 28)]
class OSPFv3_LSReq_Item(Packet):
name = "OSPFv3 Link State Request (item)"
fields_desc = [ShortField("reserved", 0),
ShortEnumField("type", 0x2001, _OSPFv3_LStypes),
IPField("id", "1.1.1.1"),
IPField("adrouter", "1.1.1.1")]
def extract_padding(self, s):
return "", s
class OSPFv3_LSReq(Packet):
name = "OSPFv3 Link State Request (container)"
fields_desc = [PacketListField("requests", None, OSPFv3_LSReq_Item,
count_from = lambda pkt:None,
length_from = lambda pkt:pkt.underlayer.len - 16)]
class OSPFv3_LSUpd(Packet):
name = "OSPFv3 Link State Update"
fields_desc = [FieldLenField("lsacount", None, fmt="!I", count_of="lsalist"),
PacketListField("lsalist", [], _OSPFv3_LSAGuessPayloadClass,
count_from = lambda pkt:pkt.lsacount,
length_from = lambda pkt:pkt.underlayer.len - 16)]
class OSPFv3_LSAck(Packet):
name = "OSPFv3 Link State Acknowledgement"
fields_desc = [PacketListField("lsaheaders", None, OSPFv3_LSA_Hdr,
count_from = lambda pkt:None,
length_from = lambda pkt:pkt.underlayer.len - 16)]
bind_layers(IP, OSPF_Hdr, proto=89)
bind_layers(OSPF_Hdr, OSPF_Hello, type=1)
bind_layers(OSPF_Hdr, OSPF_DBDesc, type=2)
bind_layers(OSPF_Hdr, OSPF_LSReq, type=3)
bind_layers(OSPF_Hdr, OSPF_LSUpd, type=4)
bind_layers(OSPF_Hdr, OSPF_LSAck, type=5)
bind_layers(IPv6, OSPFv3_Hdr, nh=89)
bind_layers(OSPFv3_Hdr, OSPFv3_Hello, type=1)
bind_layers(OSPFv3_Hdr, OSPFv3_DBDesc, type=2)
bind_layers(OSPFv3_Hdr, OSPFv3_LSReq, type=3)
bind_layers(OSPFv3_Hdr, OSPFv3_LSUpd, type=4)
bind_layers(OSPFv3_Hdr, OSPFv3_LSAck, type=5)
if __name__ == "__main__":
interact(mydict=globals(), mybanner="OSPF extension %s" % EXT_VERSION)