# scapy.contrib.description = Open Shortest Path First (OSPF)
# scapy.contrib.status = loads
# This file is part of Scapy
# Scapy 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
# any later version.
#
# Scapy 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.
#
# You should have received a copy of the GNU General Public License
# along with Scapy. If not, see .
"""
OSPF extension for 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
"""
import struct
from scapy.packet import bind_layers, Packet
from scapy.fields import BitField, ByteEnumField, ByteField, \
ConditionalField, DestIP6Field, FieldLenField, \
FieldListField, FlagsField, IP6Field, IP6PrefixField, IPField, \
IntEnumField, IntField, LenField, PacketListField, ShortEnumField, \
ShortField, StrLenField, X3BytesField, XIntField, XLongField, XShortField
from scapy.layers.inet import IP, DestIPField
from scapy.layers.inet6 import IPv6, in6_chksum
from scapy.utils import fletcher16_checkbytes, checksum, inet_aton
from scapy.compat import orb
from scapy.config import conf
EXT_VERSION = "v0.9.2"
class OSPFOptionsField(FlagsField):
def __init__(self, name="options", default=0, size=8,
names=None):
if names is None:
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 _NoLLSLenField(LenField):
"""
LenField that will ignore the size of OSPF_LLS_Hdr if it exists
in the payload
"""
def i2m(self, pkt, x):
if x is None:
x = self.adjust(len(pkt.payload))
if OSPF_LLS_Hdr in pkt:
x -= len(pkt[OSPF_LLS_Hdr])
return x
class OSPF_Hdr(Packet):
name = "OSPF Header"
fields_desc = [
ByteField("version", 2),
ByteEnumField("type", 1, _OSPF_types),
_NoLLSLenField("len", None, adjust=lambda x: x + 24),
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), # noqa: E501
# Crypto Authentication
ConditionalField(XShortField("reserved", 0), lambda pkt: pkt.authtype == 2), # noqa: E501
ConditionalField(ByteField("keyid", 1), lambda pkt: pkt.authtype == 2),
ConditionalField(ByteField("authdatalen", 0), lambda pkt: pkt.authtype == 2), # noqa: E501
ConditionalField(XIntField("seq", 0), lambda pkt: pkt.authtype == 2),
# TODO: Support authdata (which is appended to the packets as if it were padding) # noqa: E501
]
def post_build(self, p, pay):
# See
p += pay
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] + struct.pack("!H", ck) + 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) if pkt.underlayer else None)] # noqa: E501
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", 0),
FieldLenField("len", None, length_of="val"),
StrLenField("val", "", length_from=lambda x: x.len)]
def guess_payload_class(self, p):
return conf.padding_layer
class LLS_Extended_Options(LLS_Generic_TLV):
name = "LLS Extended Options and Flags"
fields_desc = [ShortField("type", 1),
FieldLenField("len", None, fmt="!H", length_of="options"),
StrLenField("options", "", length_from=lambda x: x.len)]
# TODO: FlagsField("options", 0, names=["LR", "RS"], size) with dynamic size # noqa: E501
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 + 4), # noqa: E501
XIntField("sequence", 0),
StrLenField("authdata", b"\x00" * 16, length_from=lambda x: x.len - 4)] # noqa: E501
_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) >= 3:
typ = struct.unpack("!H", p[0:2])[0]
clsname = _OSPF_LLSclasses.get(typ, "LLS_Generic_TLV")
cls = globals()[clsname]
return cls(p, **kargs)
class FieldLenField32Bits(FieldLenField):
def i2repr(self, pkt, x):
return repr(x) if not x else str(FieldLenField.i2h(self, pkt, x) << 2) + " bytes" # noqa: E501
class OSPF_LLS_Hdr(Packet):
name = "OSPF Link-local signaling"
fields_desc = [XShortField("chksum", None),
FieldLenField32Bits("len", None, length_of="llstlv", adjust=lambda pkt, x: (x + 4) >> 2), # noqa: E501
PacketListField("llstlv", [], _LLSGuessPayloadClass, length_from=lambda x: (x.len << 2) - 4)] # noqa: E501
def post_build(self, p, pay):
p += pay
if self.chksum is None:
c = checksum(p)
p = struct.pack("!H", c) + p[2:]
return p
_OSPF_LStypes = {1: "router",
2: "network",
3: "summaryIP",
4: "summaryASBR",
5: "external",
7: "NSSAexternal",
9: "linkScopeOpaque",
10: "areaScopeOpaque",
11: "asScopeOpaque"}
_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",
9: "OSPF_Link_Scope_Opaque_LSA",
10: "OSPF_Area_Scope_Opaque_LSA",
11: "OSPF_AS_Scope_Opaque_LSA"}
def ospf_lsa_checksum(lsa):
return fletcher16_checkbytes(b"\x00\x00" + lsa[2:], 16) # leave out age
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), # noqa: E501
ConditionalField(ShortField("tosmetric", 0), lambda pkt: False)] # noqa: E501
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 # noqa: E501
cls = conf.raw_layer
if len(p) >= 4:
typ = orb(p[3])
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):
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)] # noqa: E501
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)] # noqa: E501
class OSPF_NSSA_External_LSA(OSPF_External_LSA):
name = "OSPF NSSA External LSA"
type = 7
class OSPF_Link_Scope_Opaque_LSA(OSPF_BaseLSA):
name = "OSPF Link Scope External LSA"
type = 9
fields_desc = [ShortField("age", 1),
OSPFOptionsField(),
ByteField("type", 9),
IPField("id", "192.0.2.1"),
IPField("adrouter", "198.51.100.100"),
XIntField("seq", 0x80000001),
XShortField("chksum", None),
ShortField("len", None),
StrLenField("data", "data",
length_from=lambda pkt: pkt.len - 20)
]
def opaqueid(self):
return struct.unpack('>I', inet_aton(self.id))[0] & 0xFFFFFF
def opaquetype(self):
return (struct.unpack('>I', inet_aton(self.id))[0] >> 24) & 0xFF
class OSPF_Area_Scope_Opaque_LSA(OSPF_Link_Scope_Opaque_LSA):
name = "OSPF Area Scope External LSA"
type = 10
class OSPF_AS_Scope_Opaque_LSA(OSPF_Link_Scope_Opaque_LSA):
name = "OSPF AS Scope External LSA"
type = 11
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"]), # noqa: E501
IntField("ddseq", 1),
PacketListField("lsaheaders", None, OSPF_LSA_Hdr,
count_from=lambda pkt: None,
length_from=lambda pkt: pkt.underlayer.len - 24 - 8)] # noqa: E501
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)] # noqa: E501
class OSPF_LSUpd(Packet):
name = "OSPF Link State Update"
fields_desc = [FieldLenField("lsacount", None, fmt="!I", count_of="lsalist"), # noqa: E501
PacketListField("lsalist", None, _LSAGuessPayloadClass,
count_from=lambda pkt: pkt.lsacount,
length_from=lambda pkt: pkt.underlayer.len - 24)] # noqa: E501
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)] # noqa: E501
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
###############################################################################
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
tmp_len = self.len
if tmp_len is None:
tmp_len = len(p)
p = p[:2] + struct.pack("!H", tmp_len) + p[4:]
if self.chksum is None:
chksum = in6_chksum(89, self.underlayer, p)
p = p[:12] + struct.pack("!H", chksum) + p[14:]
return p
class OSPFv3OptionsField(FlagsField):
def __init__(self, name="options", default=0, size=24,
names=None):
if names is None:
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))] # noqa: E501
_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=None):
if names is None:
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),
FieldLenField("prefixlen", None, length_of="prefix", fmt="B"), # noqa: E501
OSPFv3PrefixOptionsField(),
ShortField("reserved2", 0),
IP6PrefixField("prefix", "2001:db8:0:42::/64", wordbytes=4, length_from=lambda pkt: pkt.prefixlen)] # noqa: E501
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),
OSPFv3OptionsField(),
ByteField("reserved2", 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),
FieldLenField("prefixlen", None, length_of="prefix", fmt="B"), # noqa: E501
OSPFv3PrefixOptionsField(),
ShortEnumField("reflstype", 0, _OSPFv3_LStypes),
IP6PrefixField("prefix", "2001:db8:0:42::/64", wordbytes=4, length_from=lambda pkt: pkt.prefixlen), # noqa: E501
ConditionalField(IP6Field("fwaddr", "::"), lambda pkt: pkt.flags & 0x02 == 0x02), # noqa: E501
ConditionalField(IntField("tag", 0), lambda pkt: pkt.flags & 0x01 == 0x01), # noqa: E501
ConditionalField(IPField("reflsid", 0), lambda pkt: pkt.reflstype != 0)] # noqa: E501
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 = [FieldLenField("prefixlen", None, length_of="prefix", fmt="B"), # noqa: E501
OSPFv3PrefixOptionsField(),
ShortField("metric", 10),
IP6PrefixField("prefix", "2001:db8:0:42::/64", wordbytes=4, length_from=lambda pkt: pkt.prefixlen)] # noqa: E501
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::"),
FieldLenField("prefixes", None, count_of="prefixlist", fmt="I"), # noqa: E501
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),
FieldLenField("prefixes", None, count_of="prefixlist", fmt="H"), # noqa: E501
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)] # noqa: E501
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)] # noqa: E501
class OSPFv3_LSUpd(Packet):
name = "OSPFv3 Link State Update"
fields_desc = [FieldLenField("lsacount", None, fmt="!I", count_of="lsalist"), # noqa: E501
PacketListField("lsalist", [], _OSPFv3_LSAGuessPayloadClass,
count_from=lambda pkt:pkt.lsacount,
length_from=lambda pkt:pkt.underlayer.len - 16)] # noqa: E501
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)] # noqa: E501
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)
DestIPField.bind_addr(OSPF_Hdr, "224.0.0.5")
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)
DestIP6Field.bind_addr(OSPFv3_Hdr, "ff02::5")
if __name__ == "__main__":
from scapy.main import interact
interact(mydict=globals(), mybanner="OSPF extension %s" % EXT_VERSION)