7563779cb0
header, if present. Don't explicitly base the length of the subset we hand to the PPP dissector on the length in the header, as it might not be present; instead, just use -1 for the lengths, as we set the length of our tvbuff if there's a length in the L2TP header. Set the length of the L2TP top-level protocol item for data packets, so it covers the L2TP header but not the packet data. Don't put a padding item into the tree if there's no padding. svn path=/trunk/; revision=6922
1083 lines
32 KiB
C
1083 lines
32 KiB
C
/* packet-l2tp.c
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* Routines for Layer Two Tunnelling Protocol (L2TP) (RFC 2661) packet
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* disassembly
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* John Thomes <john@ensemblecom.com>
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*
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* Minor changes by: (2000-01-10)
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* Laurent Cazalet <laurent.cazalet@mailclub.net>
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* Thomas Parvais <thomas.parvais@advalvas.be>
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*
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* $Id: packet-l2tp.c,v 1.37 2003/01/14 18:57:07 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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static int proto_l2tp = -1;
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static int hf_l2tp_type = -1;
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static int hf_l2tp_length_bit = -1;
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static int hf_l2tp_seq_bit = -1;
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static int hf_l2tp_offset_bit = -1;
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static int hf_l2tp_priority = -1;
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static int hf_l2tp_version = -1;
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static int hf_l2tp_length = -1;
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static int hf_l2tp_tunnel = -1;
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static int hf_l2tp_session = -1;
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static int hf_l2tp_Ns = -1;
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static int hf_l2tp_Nr = -1;
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static int hf_l2tp_offset = -1;
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static int hf_l2tp_avp_mandatory = -1;
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static int hf_l2tp_avp_hidden = -1;
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static int hf_l2tp_avp_length = -1;
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static int hf_l2tp_avp_vendor_id = -1;
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static int hf_l2tp_avp_type = -1;
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static int hf_l2tp_tie_breaker = -1;
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/resolv.h>
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#define UDP_PORT_L2TP 1701
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#define CONTROL_BIT(msg_info) (msg_info & 0x8000) /* Type bit control = 1 data = 0 */
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#define LENGTH_BIT(msg_info) (msg_info & 0x4000) /* Length bit = 1 */
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#define RESERVE_BITS(msg_info) (msg_info &0x37F8) /* Reserved bit - usused */
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#define SEQUENCE_BIT(msg_info) (msg_info & 0x0800) /* SEQUENCE bit = 1 Ns and Nr fields */
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#define OFFSET_BIT(msg_info) (msg_info & 0x0200) /* Offset */
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#define PRIORITY_BIT(msg_info) (msg_info & 0x0100) /* Priority */
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#define L2TP_VERSION(msg_info) (msg_info & 0x000f) /* Version of l2tp */
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#define MANDATORY_BIT(msg_info) (msg_info & 0x8000) /* Mandatory = 1 */
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#define HIDDEN_BIT(msg_info) (msg_info & 0x4000) /* Hidden = 1 */
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#define AVP_LENGTH(msg_info) (msg_info & 0x03ff) /* AVP Length */
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#define FRAMING_SYNC(msg_info) (msg_info & 0x0001) /* SYNC Framing Type */
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#define FRAMING_ASYNC(msg_info) (msg_info & 0x0002) /* ASYNC Framing Type */
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#define BEARER_DIGITAL(msg_info) (msg_info & 0x0001) /* Digital Bearer Type */
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#define BEARER_ANALOG(msg_info) (msg_info & 0x0002) /* Analog Bearer Type */
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static gint ett_l2tp = -1;
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static gint ett_l2tp_ctrl = -1;
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static gint ett_l2tp_avp = -1;
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static gint ett_l2tp_lcp = -1;
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#define AVP_SCCRQ 1
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#define AVP_SCCRP 2
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#define AVP_SCCCN 3
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#define AVP_StopCCN 4
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#define AVP_Reserved 5
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#define AVP_HELLO 6
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#define AVP_OCRQ 7
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#define AVP_OCRP 8
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#define AVP_ORCRP 9
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#define AVP_ICRQ 10
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#define AVP_ICRP 11
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#define AVP_ICCN 12
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#define AVP_Reserved1 13
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#define AVP_CDN 14
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#define NUM_CONTROL_CALL_TYPES 16
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static const char *calltypestr[NUM_CONTROL_CALL_TYPES+1] = {
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"Unknown Call Type ",
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"Start_Control_Request ",
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"Start_Control_Reply ",
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"Start_Control_Connected ",
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"Stop_Control_Notification ",
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"Reserved ",
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"Hello ",
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"Outgoing_Call_Request ",
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"Outgoing_Call_Reply ",
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"Outgoing_Call_Connected ",
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"Incoming_Call_Request ",
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"Incoming_Call_Reply ",
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"Incoming_Call_Connected ",
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"Reserved ",
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"Call_Disconnect_Notification",
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"WAN_Error_Notify ",
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"Set_Link_Info ",
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};
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static const char *calltype_short_str[NUM_CONTROL_CALL_TYPES+1] = {
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"Unknown ",
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"SCCRQ ",
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"SCCRP ",
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"SCCCN ",
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"StopCCN ",
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"Reserved",
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"Hello ",
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"OCRQ ",
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"OCRP ",
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"OCCN ",
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"ICRQ ",
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"ICRP ",
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"ICCN ",
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"Reserved",
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"CDN ",
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"WEN ",
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"SLI ",
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};
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static const char *control_msg = "Control Message";
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static const char *data_msg = "Data Message";
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static const value_string l2tp_type_vals[] = {
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{ 0, "Data Message" },
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{ 1, "Control Message" },
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{ 0, NULL },
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};
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static const value_string cause_code_direction_vals[] = {
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{ 0, "global error" },
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{ 1, "at peer" },
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{ 2, "at local" },
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{ 0, NULL },
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};
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static const true_false_string l2tp_length_bit_truth =
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{ "Length field is present", "Length field is not present" };
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static const true_false_string l2tp_seq_bit_truth =
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{ "Ns and Nr fields are present", "Ns and Nr fields are not present" };
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static const true_false_string l2tp_offset_bit_truth =
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{ "Offset Size field is present", "Offset size field is not present" };
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static const true_false_string l2tp_priority_truth =
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{ "This data message has priority", "No priority" };
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static const value_string authen_type_vals[] = {
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{ 0, "Reserved" },
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{ 1, "Textual username and password" },
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{ 2, "PPP CHAP" },
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{ 3, "PPP PAP" },
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{ 4, "No Authentication" },
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{ 5, "Microsoft CHAP Version 1" },
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{ 0, NULL }
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};
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#define CONTROL_MESSAGE 0
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#define RESULT_ERROR_CODE 1
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#define PROTOCOL_VERSION 2
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#define FRAMING_CAPABILITIES 3
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#define BEARER_CAPABILITIES 4
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#define TIE_BREAKER 5
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#define FIRMWARE_REVISION 6
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#define HOST_NAME 7
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#define VENDOR_NAME 8
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#define ASSIGNED_TUNNEL_ID 9
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#define RECEIVE_WINDOW_SIZE 10
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#define CHALLENGE 11
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#define CAUSE_CODE 12
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#define CHALLENGE_RESPONSE 13
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#define ASSIGNED_SESSION 14
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#define CALL_SERIAL_NUMBER 15
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#define MINIMUM_BPS 16
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#define MAXIMUM_BPS 17
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#define BEARER_TYPE 18
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#define FRAMING_TYPE 19
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#define CALLED_NUMBER 21
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#define CALLING_NUMBER 22
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#define SUB_ADDRESS 23
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#define TX_CONNECT_SPEED 24
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#define PHYSICAL_CHANNEL 25
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#define INITIAL_RECEIVED_LCP_CONFREQ 26
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#define LAST_SENT_LCP_CONFREQ 27
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#define LAST_RECEIVED_LCP_CONFREQ 28
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#define PROXY_AUTHEN_TYPE 29
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#define PROXY_AUTHEN_NAME 30
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#define PROXY_AUTHEN_CHALLENGE 31
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#define PROXY_AUTHEN_ID 32
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#define PROXY_AUTHEN_RESPONSE 33
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#define CALL_STATUS_AVPS 34
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#define ACCM 35
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#define RANDOM_VECTOR 36
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#define PRIVATE_GROUP_ID 37
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#define RX_CONNECT_SPEED 38
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#define SEQUENCING_REQUIRED 39
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#define PPP_DISCONNECT_CAUSE_CODE 46 /* RFC 3145 */
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#define NUM_AVP_TYPES 40
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static const value_string avp_type_vals[] = {
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{ CONTROL_MESSAGE, "Control Message" },
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{ RESULT_ERROR_CODE, "Result-Error Code" },
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{ PROTOCOL_VERSION, "Protocol Version" },
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{ FRAMING_CAPABILITIES, "Framing Capabilities" },
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{ BEARER_CAPABILITIES, "Bearer Capabilities" },
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{ TIE_BREAKER, "Tie Breaker" },
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{ FIRMWARE_REVISION, "Firmware Revision" },
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{ HOST_NAME, "Host Name" },
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{ VENDOR_NAME, "Vendor Name" },
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{ ASSIGNED_TUNNEL_ID, "Assigned Tunnel ID" },
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{ RECEIVE_WINDOW_SIZE, "Receive Window Size" },
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{ CHALLENGE, "Challenge" },
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{ CAUSE_CODE, "Cause Code" },
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{ CHALLENGE_RESPONSE, "Challenge Response" },
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{ ASSIGNED_SESSION, "Assigned Session" },
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{ CALL_SERIAL_NUMBER, "Call Serial Number" },
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{ MINIMUM_BPS, "Minimum BPS" },
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{ MAXIMUM_BPS, "Maximum BPS" },
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{ BEARER_TYPE, "Bearer Type" },
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{ FRAMING_TYPE, "Framing Type" },
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{ CALLED_NUMBER, "Called Number" },
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{ CALLING_NUMBER, "Calling Number" },
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{ SUB_ADDRESS, "Sub-Address" },
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{ TX_CONNECT_SPEED, "Connect Speed" },
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{ PHYSICAL_CHANNEL, "Physical Channel" },
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{ INITIAL_RECEIVED_LCP_CONFREQ, "Initial Received LCP CONFREQ" },
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{ LAST_SENT_LCP_CONFREQ, "Last Sent LCP CONFREQ" },
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{ LAST_RECEIVED_LCP_CONFREQ, "Last Received LCP CONFREQ" },
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{ PROXY_AUTHEN_TYPE, "Proxy Authen Type" },
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{ PROXY_AUTHEN_NAME, "Proxy Authen Name" },
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{ PROXY_AUTHEN_CHALLENGE, "Proxy Authen Challenge" },
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{ PROXY_AUTHEN_ID, "Proxy Authen ID" },
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{ PROXY_AUTHEN_RESPONSE, "Proxy Authen Response" },
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{ CALL_STATUS_AVPS, "Call status AVPs" },
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{ ACCM, "ACCM" },
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{ RANDOM_VECTOR, "Random Vector" },
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{ PRIVATE_GROUP_ID, "Private group ID" },
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{ RX_CONNECT_SPEED, "RxConnect Speed" },
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{ SEQUENCING_REQUIRED, "Sequencing Required" },
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{ PPP_DISCONNECT_CAUSE_CODE, "PPP Disconnect Cause Code" },
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{ 0, NULL }
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};
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/*
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* These are SMI Network Management Private Enterprise Codes for
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* organizations; see
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*
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* http://www.isi.edu/in-notes/iana/assignments/enterprise-numbers
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*
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* for a list.
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*/
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#define VENDOR_IETF 0
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#define VENDOR_ACC 5
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#define VENDOR_CISCO 9
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#define VENDOR_SHIVA 166
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#define VENDOR_LIVINGSTON 307
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#define VENDOR_3COM 429
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#define VENDOR_ASCEND 529
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#define VENDOR_BAY 1584
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#define VENDOR_REDBACK 2352
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#define VENDOR_JUNIPER 2636
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#define VENDOR_COSINE 3085
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#define VENDOR_UNISPHERE 4874
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static const value_string avp_vendor_id_vals[] =
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{{VENDOR_IETF,"IETF"},
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{VENDOR_ACC,"ACC"},
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{VENDOR_CISCO,"Cisco"},
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{VENDOR_SHIVA,"Shiva"},
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{VENDOR_LIVINGSTON,"Livingston"},
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{VENDOR_3COM,"3Com"},
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{VENDOR_ASCEND,"Ascend"},
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{VENDOR_BAY,"Bay Networks"},
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{VENDOR_REDBACK,"Redback"},
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{VENDOR_JUNIPER,"Juniper Networks"},
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{VENDOR_COSINE,"CoSine Communications"},
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{VENDOR_UNISPHERE,"Unisphere Networks"},
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{0,NULL}};
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static gchar textbuffer[200];
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static dissector_handle_t ppp_hdlc_handle;
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static dissector_handle_t ppp_lcp_options_handle;
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static void
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dissect_l2tp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *l2tp_tree=NULL, *l2tp_avp_tree, *l2tp_lcp_avp_tree, *ctrl_tree;
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proto_item *l2tp_item = NULL, *ti, *tf, *te;
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int rhcode;
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int index = 0;
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int tmp_index;
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guint16 length = 0; /* Length field */
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guint16 tid; /* Tunnel ID */
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guint16 cid; /* Call ID */
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guint16 offset_size; /* Offset size */
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guint16 ver_len_hidden;
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guint16 avp_vendor_id;
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guint16 avp_type;
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guint16 msg_type;
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guint16 avp_len;
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guint16 result_code;
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guint16 error_code;
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guint32 bits;
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guint16 firmware_rev;
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guint16 control;
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tvbuff_t *next_tvb;
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) /* build output for closed L2tp frame displayed */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "L2TP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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control = tvb_get_ntohs(tvb, 0);
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if (L2TP_VERSION(control) != 2) {
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "L2TP Version %u", L2TP_VERSION(control) );
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}
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return;
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}
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rhcode= 10;
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if (LENGTH_BIT(control)) { /* length field included ? */
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index += 2; /* skip ahead */
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length = tvb_get_ntohs(tvb, index);
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}
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|
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/* collect the tunnel id & call id */
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index += 2;
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tid = tvb_get_ntohs(tvb, index);
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index += 2;
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cid = tvb_get_ntohs(tvb, index);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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if (CONTROL_BIT(control)) {
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/* CONTROL MESSAGE */
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tmp_index = index;
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if ((LENGTH_BIT(control))&&(length==12)) /* ZLB Message */
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sprintf(textbuffer,"%s - ZLB (tunnel id=%d, session id=%d)",
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control_msg , tid ,cid);
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else
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{
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if (SEQUENCE_BIT(control)) {
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tmp_index += 4;
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}
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|
|
|
tmp_index+=4;
|
|
|
|
avp_type = tvb_get_ntohs(tvb, (tmp_index+=2));
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|
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if (avp_type == CONTROL_MESSAGE)
|
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{
|
|
/* We print message type */
|
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msg_type = tvb_get_ntohs(tvb, (tmp_index+=2));
|
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sprintf(textbuffer,"%s - %s (tunnel id=%d, session id=%d)",
|
|
control_msg ,
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((NUM_CONTROL_CALL_TYPES + 1 ) > msg_type) ?
|
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calltype_short_str[msg_type] : "Unknown",
|
|
tid ,cid);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* This is not a control message.
|
|
* We never pass here except in case of bad l2tp packet!
|
|
*/
|
|
sprintf(textbuffer,"%s (tunnel id=%d, session id=%d)",
|
|
control_msg , tid ,cid);
|
|
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
/* DATA Message */
|
|
sprintf(textbuffer,"%s (tunnel id=%d, session id=%d)",
|
|
data_msg, tid ,cid);
|
|
}
|
|
col_add_fstr(pinfo->cinfo,COL_INFO,textbuffer);
|
|
}
|
|
|
|
if (LENGTH_BIT(control)) {
|
|
/*
|
|
* Set the length of this tvbuff to be no longer than the length
|
|
* in the header.
|
|
*
|
|
* XXX - complain if that length is longer than the length of
|
|
* the tvbuff? Have "set_actual_length()" return a Boolean
|
|
* and have its callers check the result?
|
|
*/
|
|
set_actual_length(tvb, length);
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|
}
|
|
|
|
if (tree) {
|
|
l2tp_item = proto_tree_add_item(tree,proto_l2tp, tvb, 0, -1, FALSE);
|
|
l2tp_tree = proto_item_add_subtree(l2tp_item, ett_l2tp);
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|
|
|
ti = proto_tree_add_text(l2tp_tree, tvb, 0, 2,
|
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"Packet Type: %s Tunnel Id=%d Session Id=%d",
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|
(CONTROL_BIT(control) ? control_msg : data_msg), tid, cid);
|
|
|
|
ctrl_tree = proto_item_add_subtree(ti, ett_l2tp_ctrl);
|
|
proto_tree_add_uint(ctrl_tree, hf_l2tp_type, tvb, 0, 2, control);
|
|
proto_tree_add_boolean(ctrl_tree, hf_l2tp_length_bit, tvb, 0, 2, control);
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|
proto_tree_add_boolean(ctrl_tree, hf_l2tp_seq_bit, tvb, 0, 2, control);
|
|
proto_tree_add_boolean(ctrl_tree, hf_l2tp_offset_bit, tvb, 0, 2, control);
|
|
proto_tree_add_boolean(ctrl_tree, hf_l2tp_priority, tvb, 0, 2, control);
|
|
proto_tree_add_uint(ctrl_tree, hf_l2tp_version, tvb, 0, 2, control);
|
|
}
|
|
index = 2;
|
|
if (LENGTH_BIT(control)) {
|
|
if (tree) {
|
|
proto_tree_add_item(l2tp_tree, hf_l2tp_length, tvb, index, 2, FALSE);
|
|
}
|
|
index += 2;
|
|
}
|
|
|
|
if (tree) {
|
|
proto_tree_add_item(l2tp_tree, hf_l2tp_tunnel, tvb, index, 2, FALSE);
|
|
}
|
|
index += 2;
|
|
if (tree) {
|
|
proto_tree_add_item(l2tp_tree, hf_l2tp_session, tvb, index, 2, FALSE);
|
|
}
|
|
index += 2;
|
|
|
|
if (SEQUENCE_BIT(control)) {
|
|
if (tree) {
|
|
proto_tree_add_item(l2tp_tree, hf_l2tp_Ns, tvb, index, 2, FALSE);
|
|
}
|
|
index += 2;
|
|
if (tree) {
|
|
proto_tree_add_item(l2tp_tree, hf_l2tp_Nr, tvb, index, 2, FALSE);
|
|
}
|
|
index += 2;
|
|
}
|
|
if (OFFSET_BIT(control)) {
|
|
offset_size = tvb_get_ntohs(tvb, index);
|
|
if (tree) {
|
|
proto_tree_add_uint(l2tp_tree, hf_l2tp_offset, tvb, index, 2,
|
|
offset_size);
|
|
}
|
|
index += 2;
|
|
if (offset_size != 0) {
|
|
if (tree) {
|
|
proto_tree_add_text(l2tp_tree, tvb, index, offset_size, "Offset Padding");
|
|
}
|
|
index += offset_size;
|
|
}
|
|
}
|
|
if (tree && (LENGTH_BIT(control))&&(length==12)) {
|
|
proto_tree_add_text(l2tp_tree, tvb, 0, 0, "Zero Length Bit message");
|
|
}
|
|
|
|
if (!CONTROL_BIT(control)) { /* Data Messages so we are done */
|
|
if (tree)
|
|
proto_item_set_len(l2tp_item, index);
|
|
/* If we have data, signified by having a length bit, dissect it */
|
|
if (tvb_offset_exists(tvb, index)) {
|
|
next_tvb = tvb_new_subset(tvb, index, -1, -1);
|
|
call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (tree) {
|
|
if (!LENGTH_BIT(control)) {
|
|
return;
|
|
}
|
|
while (index < length ) { /* Process AVP's */
|
|
ver_len_hidden = tvb_get_ntohs(tvb, index);
|
|
avp_len = AVP_LENGTH(ver_len_hidden);
|
|
avp_vendor_id = tvb_get_ntohs(tvb, index + 2);
|
|
avp_type = tvb_get_ntohs(tvb, index + 4);
|
|
|
|
if (avp_vendor_id == VENDOR_IETF) {
|
|
tf = proto_tree_add_text(l2tp_tree, tvb, index,
|
|
avp_len, "%s AVP",
|
|
val_to_str(avp_type, avp_type_vals, "Unknown (%u)"));
|
|
} else { /* Vendor-Specific AVP */
|
|
tf = proto_tree_add_text(l2tp_tree, tvb, index,
|
|
avp_len, "Vendor %s AVP",
|
|
val_to_str(avp_vendor_id, avp_vendor_id_vals, "Unknown (%u)"));
|
|
}
|
|
|
|
l2tp_avp_tree = proto_item_add_subtree(tf, ett_l2tp_avp);
|
|
|
|
proto_tree_add_boolean_format(l2tp_avp_tree,hf_l2tp_avp_mandatory, tvb, index, 1,
|
|
rhcode, "Mandatory: %s",
|
|
(MANDATORY_BIT(ver_len_hidden)) ? "True" : "False" );
|
|
proto_tree_add_boolean_format(l2tp_avp_tree,hf_l2tp_avp_hidden, tvb, index, 1,
|
|
rhcode, "Hidden: %s",
|
|
(HIDDEN_BIT(ver_len_hidden)) ? "True" : "False" );
|
|
proto_tree_add_uint_format(l2tp_avp_tree,hf_l2tp_avp_length, tvb, index, 2,
|
|
rhcode, "Length: %u", avp_len);
|
|
if (HIDDEN_BIT(ver_len_hidden)) { /* don't try do display hidden */
|
|
index += avp_len;
|
|
continue;
|
|
}
|
|
|
|
if (avp_len == 0) {
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 0,
|
|
"AVP length must not be zero");
|
|
return;
|
|
}
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
proto_tree_add_item(l2tp_avp_tree, hf_l2tp_avp_vendor_id,
|
|
tvb, index, 2, FALSE);
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
if (avp_vendor_id != VENDOR_IETF) {
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Type: %u", avp_type);
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
/* For the time being, we don't decode any Vendor-
|
|
specific AVP. */
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index,
|
|
avp_len, "Vendor-Specific AVP");
|
|
|
|
index += avp_len;
|
|
continue;
|
|
}
|
|
|
|
proto_tree_add_uint(l2tp_avp_tree, hf_l2tp_avp_type,
|
|
tvb, index, 2, avp_type);
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
switch (avp_type) {
|
|
|
|
case CONTROL_MESSAGE:
|
|
msg_type = tvb_get_ntohs(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree,tvb, index, 2,
|
|
"Control Message Type: (%u) %s", msg_type,
|
|
((NUM_CONTROL_CALL_TYPES + 1 ) > msg_type) ?
|
|
calltypestr[msg_type] : "Unknown");
|
|
break;
|
|
|
|
case RESULT_ERROR_CODE:
|
|
if (avp_len < 2)
|
|
break;
|
|
result_code = tvb_get_ntohs(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Result code: %u", result_code);
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
if (avp_len < 2)
|
|
break;
|
|
error_code = tvb_get_ntohs(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Error code: %u", error_code);
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
if (avp_len == 0)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Error Message: %.*s", avp_len,
|
|
tvb_get_ptr(tvb, index, avp_len));
|
|
break;
|
|
|
|
case PROTOCOL_VERSION:
|
|
if (avp_len < 1)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 1,
|
|
"Version: %u", tvb_get_guint8(tvb, index));
|
|
index += 1;
|
|
avp_len -= 1;
|
|
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 1,
|
|
"Revision: %u", tvb_get_guint8(tvb, index));
|
|
break;
|
|
|
|
case FRAMING_CAPABILITIES:
|
|
bits = tvb_get_ntohl(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Async Framing Supported: %s",
|
|
(FRAMING_ASYNC(bits)) ? "True" : "False");
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Sync Framing Supported: %s",
|
|
(FRAMING_SYNC(bits)) ? "True" : "False");
|
|
break;
|
|
|
|
case BEARER_CAPABILITIES:
|
|
bits = tvb_get_ntohl(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Analog Access Supported: %s",
|
|
(BEARER_ANALOG(bits)) ? "True" : "False");
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Digital Access Supported: %s",
|
|
(BEARER_DIGITAL(bits)) ? "True" : "False");
|
|
break;
|
|
|
|
case TIE_BREAKER:
|
|
proto_tree_add_item(l2tp_avp_tree, hf_l2tp_tie_breaker, tvb, index, 8, FALSE);
|
|
break;
|
|
|
|
case FIRMWARE_REVISION:
|
|
firmware_rev = tvb_get_ntohs(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Firmware Revision: %d 0x%x", firmware_rev,firmware_rev );
|
|
break;
|
|
|
|
case HOST_NAME:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Host Name: %.*s", avp_len,
|
|
tvb_get_ptr(tvb, index, avp_len));
|
|
break;
|
|
|
|
case VENDOR_NAME:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Vendor Name: %.*s", avp_len,
|
|
tvb_get_ptr(tvb, index, avp_len));
|
|
break;
|
|
|
|
case ASSIGNED_TUNNEL_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Tunnel ID: %u", tvb_get_ntohs(tvb, index));
|
|
break;
|
|
|
|
case RECEIVE_WINDOW_SIZE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Receive Window Size: %u",
|
|
tvb_get_ntohs(tvb, index));
|
|
break;
|
|
|
|
case CHALLENGE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"CHAP Challenge: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
|
|
case CAUSE_CODE:
|
|
/*
|
|
* XXX - export stuff from the Q.931 dissector
|
|
* to dissect the cause code and cause message,
|
|
* and use it.
|
|
*/
|
|
if (avp_len < 2)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Cause Code: %u",
|
|
tvb_get_ntohs(tvb, index));
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
if (avp_len < 1)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 1,
|
|
"Cause Msg: %u",
|
|
tvb_get_guint8(tvb, index));
|
|
index += 1;
|
|
avp_len -= 1;
|
|
|
|
if (avp_len == 0)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Advisory Msg: %.*s", avp_len,
|
|
tvb_get_ptr(tvb, index, avp_len));
|
|
break;
|
|
|
|
case CHALLENGE_RESPONSE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 16,
|
|
"CHAP Challenge Response: %s",
|
|
tvb_bytes_to_str(tvb, index, 16));
|
|
break;
|
|
|
|
case ASSIGNED_SESSION:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Assigned Session: %u",
|
|
tvb_get_ntohs(tvb, index));
|
|
break;
|
|
|
|
case CALL_SERIAL_NUMBER:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Call Serial Number: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
|
|
case MINIMUM_BPS:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Minimum BPS: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
|
|
case MAXIMUM_BPS:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Maximum BPS: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
|
|
case BEARER_TYPE:
|
|
bits = tvb_get_ntohl(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Analog Bearer Type: %s",
|
|
(BEARER_ANALOG(bits)) ? "True" : "False");
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Digital Bearer Type: %s",
|
|
(BEARER_DIGITAL(bits)) ? "True" : "False");
|
|
break;
|
|
|
|
case FRAMING_TYPE:
|
|
bits = tvb_get_ntohl(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Async Framing Type: %s",
|
|
(FRAMING_ASYNC(bits)) ? "True" : "False");
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Sync Framing Type: %s",
|
|
(FRAMING_SYNC(bits)) ? "True" : "False");
|
|
break;
|
|
|
|
case CALLED_NUMBER:
|
|
if (avp_len == 0)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Called Number: %.*s", avp_len,
|
|
tvb_get_ptr(tvb, index, avp_len));
|
|
break;
|
|
|
|
case CALLING_NUMBER:
|
|
if (avp_len == 0)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Calling Number: %.*s", avp_len,
|
|
tvb_get_ptr(tvb, index, avp_len));
|
|
break;
|
|
|
|
case SUB_ADDRESS:
|
|
if (avp_len == 0)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Sub-Address: %.*s", avp_len,
|
|
tvb_get_ptr(tvb, index, avp_len));
|
|
break;
|
|
|
|
case TX_CONNECT_SPEED:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Connect Speed: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
|
|
case PHYSICAL_CHANNEL:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Physical Channel: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
|
|
case INITIAL_RECEIVED_LCP_CONFREQ:
|
|
te = proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Initial Received LCP CONFREQ: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
l2tp_lcp_avp_tree = proto_item_add_subtree(te, ett_l2tp_lcp);
|
|
next_tvb = tvb_new_subset(tvb, index, avp_len, avp_len);
|
|
call_dissector(ppp_lcp_options_handle, next_tvb, pinfo, l2tp_lcp_avp_tree );
|
|
break;
|
|
|
|
case LAST_SENT_LCP_CONFREQ:
|
|
te = proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Last Sent LCP CONFREQ: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
l2tp_lcp_avp_tree = proto_item_add_subtree(te, ett_l2tp_lcp);
|
|
next_tvb = tvb_new_subset(tvb, index, avp_len, avp_len);
|
|
call_dissector(ppp_lcp_options_handle, next_tvb, pinfo, l2tp_lcp_avp_tree );
|
|
break;
|
|
|
|
case LAST_RECEIVED_LCP_CONFREQ:
|
|
te = proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Last Received LCP CONFREQ: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
l2tp_lcp_avp_tree = proto_item_add_subtree(te, ett_l2tp_lcp);
|
|
next_tvb = tvb_new_subset(tvb, index, avp_len, avp_len);
|
|
call_dissector(ppp_lcp_options_handle, next_tvb, pinfo, l2tp_lcp_avp_tree );
|
|
break;
|
|
|
|
case PROXY_AUTHEN_TYPE:
|
|
msg_type = tvb_get_ntohs(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Proxy Authen Type: %s",
|
|
val_to_str(msg_type, authen_type_vals, "Unknown (%u)"));
|
|
break;
|
|
|
|
case PROXY_AUTHEN_NAME:
|
|
if (avp_len == 0)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Proxy Authen Name: %.*s", avp_len,
|
|
tvb_get_ptr(tvb, index, avp_len));
|
|
break;
|
|
|
|
case PROXY_AUTHEN_CHALLENGE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Proxy Authen Challenge: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
|
|
case PROXY_AUTHEN_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index + 1, 1,
|
|
"Proxy Authen ID: %u",
|
|
tvb_get_guint8(tvb, index + 1));
|
|
break;
|
|
|
|
case PROXY_AUTHEN_RESPONSE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Proxy Authen Response: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
|
|
case CALL_STATUS_AVPS:
|
|
if (avp_len < 2)
|
|
break;
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
if (avp_len < 4)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"CRC Errors: %u", tvb_get_ntohl(tvb, index));
|
|
index += 4;
|
|
avp_len -= 4;
|
|
|
|
if (avp_len < 4)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Framing Errors: %u", tvb_get_ntohl(tvb, index));
|
|
index += 4;
|
|
avp_len -= 4;
|
|
|
|
if (avp_len < 4)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Hardware Overruns: %u", tvb_get_ntohl(tvb, index));
|
|
index += 4;
|
|
avp_len -= 4;
|
|
|
|
if (avp_len < 4)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Buffer Overruns: %u", tvb_get_ntohl(tvb, index));
|
|
index += 4;
|
|
avp_len -= 4;
|
|
|
|
if (avp_len < 4)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Time-out Errors: %u", tvb_get_ntohl(tvb, index));
|
|
index += 4;
|
|
avp_len -= 4;
|
|
|
|
if (avp_len < 4)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Alignment Errors: %u", tvb_get_ntohl(tvb, index));
|
|
index += 4;
|
|
avp_len -= 4;
|
|
break;
|
|
|
|
case ACCM:
|
|
if (avp_len < 2)
|
|
break;
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
if (avp_len < 4)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Send ACCM: %u", tvb_get_ntohl(tvb, index));
|
|
index += 4;
|
|
avp_len -= 4;
|
|
|
|
if (avp_len < 4)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Receive ACCM: %u", tvb_get_ntohl(tvb, index));
|
|
index += 4;
|
|
avp_len -= 4;
|
|
break;
|
|
|
|
case RANDOM_VECTOR:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Random Vector: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
|
|
case PRIVATE_GROUP_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Private Group ID: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
|
|
case RX_CONNECT_SPEED:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Rx Connect Speed: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
|
|
case PPP_DISCONNECT_CAUSE_CODE:
|
|
if (avp_len < 2)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Disconnect Code: %u",
|
|
tvb_get_ntohs(tvb, index));
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
if (avp_len < 2)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Control Protocol Number: %u",
|
|
tvb_get_ntohs(tvb, index));
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
if (avp_len < 1)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 1,
|
|
"Direction: %s",
|
|
val_to_str(tvb_get_guint8(tvb, index),
|
|
cause_code_direction_vals,
|
|
"Reserved (%u)"));
|
|
index += 1;
|
|
avp_len -= 1;
|
|
|
|
if (avp_len == 0)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Message: %.*s", avp_len,
|
|
tvb_get_ptr(tvb, index, avp_len));
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Unknown AVP");
|
|
break;
|
|
}
|
|
|
|
/* printf("Avp Decode avp_len= %d index= %d length= %d %x\n ",avp_len,
|
|
index,length,length); */
|
|
|
|
index += avp_len;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
/* registration with the filtering engine */
|
|
void
|
|
proto_register_l2tp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_l2tp_type,
|
|
{ "Type", "l2tp.type", FT_UINT16, BASE_DEC, VALS(l2tp_type_vals), 0x8000,
|
|
"Type bit", HFILL }},
|
|
|
|
{ &hf_l2tp_length_bit,
|
|
{ "Length Bit", "l2tp.length_bit", FT_BOOLEAN, 16, TFS(&l2tp_length_bit_truth), 0x4000,
|
|
"Length bit", HFILL }},
|
|
|
|
{ &hf_l2tp_seq_bit,
|
|
{ "Sequence Bit", "l2tp.seq_bit", FT_BOOLEAN, 16, TFS(&l2tp_seq_bit_truth), 0x0800,
|
|
"Sequence bit", HFILL }},
|
|
|
|
{ &hf_l2tp_offset_bit,
|
|
{ "Offset bit", "l2tp.offset_bit", FT_BOOLEAN, 16, TFS(&l2tp_offset_bit_truth), 0x0200,
|
|
"Offset bit", HFILL }},
|
|
|
|
{ &hf_l2tp_priority,
|
|
{ "Priority", "l2tp.priority", FT_BOOLEAN, 16, TFS(&l2tp_priority_truth), 0x0100,
|
|
"Priority bit", HFILL }},
|
|
|
|
{ &hf_l2tp_version,
|
|
{ "Version", "l2tp.version", FT_UINT16, BASE_DEC, NULL, 0x000f,
|
|
"Version", HFILL }},
|
|
|
|
{ &hf_l2tp_length,
|
|
{ "Length","l2tp.length", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_l2tp_tunnel,
|
|
{ "Tunnel ID","l2tp.tunnel", FT_UINT16, BASE_DEC, NULL, 0x0, /* Probably should be FT_BYTES */
|
|
"Tunnel ID", HFILL }},
|
|
|
|
{ &hf_l2tp_session,
|
|
{ "Session ID","l2tp.session", FT_UINT16, BASE_DEC, NULL, 0x0, /* Probably should be FT_BYTES */
|
|
"Session ID", HFILL }},
|
|
|
|
{ &hf_l2tp_Ns,
|
|
{ "Ns","l2tp.Ns", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_l2tp_Nr,
|
|
{ "Nr","l2tp.Nr", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_l2tp_offset,
|
|
{ "Offset","l2tp.offset", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Number of octest past the L2TP header at which the"
|
|
"payload data starts.", HFILL }},
|
|
|
|
{ &hf_l2tp_avp_mandatory,
|
|
{ "Mandatory", "l2tp.avp.mandatory", FT_BOOLEAN, BASE_NONE, NULL, 0,
|
|
"Mandatory AVP", HFILL }},
|
|
|
|
{ &hf_l2tp_avp_hidden,
|
|
{ "Hidden", "l2tp.avp.hidden", FT_BOOLEAN, BASE_NONE, NULL, 0,
|
|
"Hidden AVP", HFILL }},
|
|
|
|
{ &hf_l2tp_avp_length,
|
|
{ "Length", "l2tp.avp.length", FT_UINT16, BASE_DEC, NULL, 0,
|
|
"AVP Length", HFILL }},
|
|
|
|
{ &hf_l2tp_avp_vendor_id,
|
|
{ "Vendor ID", "l2tp.avp.vendor_id", FT_UINT16, BASE_DEC, VALS(avp_vendor_id_vals), 0,
|
|
"AVP Vendor ID", HFILL }},
|
|
|
|
{ &hf_l2tp_avp_type,
|
|
{ "Type", "l2tp.avp.type", FT_UINT16, BASE_DEC, VALS(avp_type_vals), 0,
|
|
"AVP Type", HFILL }},
|
|
|
|
{ &hf_l2tp_tie_breaker,
|
|
{ "Tie Breaker", "l2tp.tie_breaker", FT_UINT64, BASE_HEX, NULL, 0,
|
|
"Tie Breaker", HFILL }},
|
|
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_l2tp,
|
|
&ett_l2tp_ctrl,
|
|
&ett_l2tp_avp,
|
|
&ett_l2tp_lcp,
|
|
};
|
|
|
|
proto_l2tp = proto_register_protocol(
|
|
"Layer 2 Tunneling Protocol", "L2TP", "l2tp");
|
|
proto_register_field_array(proto_l2tp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_l2tp(void)
|
|
{
|
|
dissector_handle_t l2tp_handle;
|
|
|
|
l2tp_handle = create_dissector_handle(dissect_l2tp, proto_l2tp);
|
|
dissector_add("udp.port", UDP_PORT_L2TP, l2tp_handle);
|
|
|
|
/*
|
|
* Get a handle for the PPP-in-HDLC-like-framing dissector.
|
|
*/
|
|
ppp_hdlc_handle = find_dissector("ppp_hdlc");
|
|
ppp_lcp_options_handle = find_dissector("ppp_lcp_options");
|
|
|
|
}
|