226 lines
7.6 KiB
Python
226 lines
7.6 KiB
Python
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# RSVP layer
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# This file is part of Scapy
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# Scapy is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# any later version.
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#
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# Scapy is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Scapy. If not, see <http://www.gnu.org/licenses/>.
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# scapy.contrib.description = Resource Reservation Protocol (RSVP)
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# scapy.contrib.status = loads
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from scapy.compat import chb
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from scapy.packet import Packet, bind_layers
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from scapy.fields import BitField, ByteEnumField, ByteField, FieldLenField, \
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IPField, ShortField, StrLenField, XByteField, XShortField
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from scapy.layers.inet import IP, checksum
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rsvpmsgtypes = {0x01: "Path",
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0x02: "Reservation request",
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0x03: "Path error",
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0x04: "Reservation request error",
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0x05: "Path teardown",
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0x06: "Reservation teardown",
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0x07: "Reservation request acknowledgment"
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}
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class RSVP(Packet):
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name = "RSVP"
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fields_desc = [BitField("Version", 1, 4),
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BitField("Flags", 1, 4),
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ByteEnumField("Class", 0x01, rsvpmsgtypes),
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XShortField("chksum", None),
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ByteField("TTL", 1),
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XByteField("dataofs", 0),
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ShortField("Length", None)]
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def post_build(self, p, pay):
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p += pay
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if self.Length is None:
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tmp_len = len(p)
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tmp_p = p[:6] + chb((tmp_len >> 8) & 0xff) + chb(tmp_len & 0xff)
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p = tmp_p + p[8:]
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if self.chksum is None:
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ck = checksum(p)
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p = p[:2] + chb(ck >> 8) + chb(ck & 0xff) + p[4:]
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return p
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rsvptypes = {0x01: "Session",
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0x03: "HOP",
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0x04: "INTEGRITY",
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0x05: "TIME_VALUES",
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0x06: "ERROR_SPEC",
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0x07: "SCOPE",
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0x08: "STYLE",
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0x09: "FLOWSPEC",
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0x0A: "FILTER_SPEC",
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0x0B: "SENDER_TEMPLATE",
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0x0C: "SENDER_TSPEC",
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0x0D: "ADSPEC",
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0x0E: "POLICY_DATA",
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0x0F: "RESV_CONFIRM",
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0x10: "RSVP_LABEL",
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0x11: "HOP_COUNT",
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0x12: "STRICT_SOURCE_ROUTE",
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0x13: "LABEL_REQUEST",
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0x14: "EXPLICIT_ROUTE",
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0x15: "ROUTE_RECORD",
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0x16: "HELLO",
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0x17: "MESSAGE_ID",
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0x18: "MESSAGE_ID_ACK",
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0x19: "MESSAGE_ID_LIST",
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0x1E: "DIAGNOSTIC",
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0x1F: "ROUTE",
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0x20: "DIAG_RESPONSE",
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0x21: "DIAG_SELECT",
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0x22: "RECOVERY_LABEL",
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0x23: "UPSTREAM_LABEL",
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0x24: "LABEL_SET",
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0x25: "PROTECTION",
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0x26: "PRIMARY PATH ROUTE",
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0x2A: "DSBM IP ADDRESS",
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0x2B: "SBM_PRIORITY",
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0x2C: "DSBM TIMER INTERVALS",
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0x2D: "SBM_INFO",
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0x32: "S2L_SUB_LSP",
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0x3F: "DETOUR",
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0x40: "CHALLENGE",
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0x41: "DIFF-SERV",
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0x42: "CLASSTYPE",
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0x43: "LSP_REQUIRED_ATTRIBUTES",
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0x80: "NODE_CHAR",
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0x81: "SUGGESTED_LABEL",
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0x82: "ACCEPTABLE_LABEL_SET",
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0x83: "RESTART_CA",
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0x84: "SESSION-OF-INTEREST",
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0x85: "LINK_CAPABILITY",
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0x86: "Capability Object",
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0xA1: "RSVP_HOP_L2",
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0xA2: "LAN_NHOP_L2",
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0xA3: "LAN_NHOP_L3",
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0xA4: "LAN_LOOPBACK",
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0xA5: "TCLASS",
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0xC0: "TUNNEL",
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0xC1: "LSP_TUNNEL_INTERFACE_ID",
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0xC2: "USER_ERROR_SPEC",
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0xC3: "NOTIFY_REQUEST",
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0xC4: "ADMIN-STATUS",
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0xC5: "LSP_ATTRIBUTES",
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0xC6: "ALARM_SPEC",
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0xC7: "ASSOCIATION",
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0xC8: "SECONDARY_EXPLICIT_ROUTE",
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0xC9: "SECONDARY_RECORD_ROUTE",
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0xCD: "FAST_REROUTE",
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0xCF: "SESSION_ATTRIBUTE",
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0xE1: "DCLASS",
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0xE2: "PACKETCABLE EXTENSIONS",
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0xE3: "ATM_SERVICECLASS",
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0xE4: "CALL_OPS (ASON)",
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0xE5: "GENERALIZED_UNI",
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0xE6: "CALL_ID",
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0xE7: "3GPP2_Object",
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0xE8: "EXCLUDE_ROUTE"
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}
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class RSVP_Object(Packet):
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name = "RSVP_Object"
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fields_desc = [ShortField("Length", 4),
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ByteEnumField("Class", 0x01, rsvptypes),
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ByteField("C-Type", 1)]
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def guess_payload_class(self, payload):
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if self.Class == 0x03:
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return RSVP_HOP
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elif self.Class == 0x05:
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return RSVP_Time
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elif self.Class == 0x0c:
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return RSVP_SenderTSPEC
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elif self.Class == 0x13:
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return RSVP_LabelReq
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elif self.Class == 0xCF:
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return RSVP_SessionAttrb
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else:
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return RSVP_Data
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class RSVP_Data(Packet):
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name = "Data"
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overload_fields = {RSVP_Object: {"Class": 0x01}}
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fields_desc = [StrLenField("Data", "", length_from=lambda pkt:pkt.underlayer.Length - 4)] # noqa: E501
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def default_payload_class(self, payload):
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return RSVP_Object
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class RSVP_HOP(Packet):
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name = "HOP"
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overload_fields = {RSVP_Object: {"Class": 0x03}}
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fields_desc = [IPField("neighbor", "0.0.0.0"),
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BitField("inface", 1, 32)]
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def default_payload_class(self, payload):
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return RSVP_Object
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class RSVP_Time(Packet):
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name = "Time Val"
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overload_fields = {RSVP_Object: {"Class": 0x05}}
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fields_desc = [BitField("refresh", 1, 32)]
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def default_payload_class(self, payload):
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return RSVP_Object
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class RSVP_SenderTSPEC(Packet):
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name = "Sender_TSPEC"
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overload_fields = {RSVP_Object: {"Class": 0x0c}}
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fields_desc = [ByteField("Msg_Format", 0),
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ByteField("reserve", 0),
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ShortField("Data_Length", 4),
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ByteField("Srv_hdr", 1),
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ByteField("reserve2", 0),
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ShortField("Srv_Length", 4),
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StrLenField("Tokens", "", length_from=lambda pkt:pkt.underlayer.Length - 12)] # noqa: E501
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def default_payload_class(self, payload):
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return RSVP_Object
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class RSVP_LabelReq(Packet):
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name = "Label Req"
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overload_fields = {RSVP_Object: {"Class": 0x13}}
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fields_desc = [ShortField("reserve", 1),
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ShortField("L3PID", 1)]
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def default_payload_class(self, payload):
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return RSVP_Object
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class RSVP_SessionAttrb(Packet):
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name = "Session_Attribute"
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overload_fields = {RSVP_Object: {"Class": 0xCF}}
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fields_desc = [ByteField("Setup_priority", 1),
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ByteField("Hold_priority", 1),
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ByteField("flags", 1),
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FieldLenField("Name_length", None, length_of="Name"),
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StrLenField("Name", "", length_from=lambda pkt:pkt.Name_length), # noqa: E501
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]
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def default_payload_class(self, payload):
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return RSVP_Object
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bind_layers(IP, RSVP, {"proto": 46})
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bind_layers(RSVP, RSVP_Object)
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