forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
the numerical value of the pseudowire type, and show the Remote End ID AVP as text rather than binary data. svn path=/trunk/; revision=13359
2061 lines
64 KiB
C
2061 lines
64 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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* $Id$
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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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/*
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* RFC 2661 for L2TPv2
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* I-D draft-ietf-l2tpext-l2tp-base for L2TPv3
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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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static int hf_l2tp_sid = -1;
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static int hf_l2tp_res = -1;
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static int hf_l2tp_ccid = -1;
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static int hf_l2tp_cookie = -1;
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static int hf_l2tp_l2_spec_def = -1;
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static int hf_l2tp_l2_spec_atm = -1;
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static int hf_l2tp_l2_spec_s = -1;
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static int hf_l2tp_l2_spec_sequence = -1;
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static int hf_l2tp_l2_spec_t = -1;
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static int hf_l2tp_l2_spec_g = -1;
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static int hf_l2tp_l2_spec_c = -1;
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static int hf_l2tp_l2_spec_u = -1;
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static int hf_l2tp_cisco_avp_type = -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/addr_resolv.h>
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#include <epan/ipproto.h>
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#include <epan/sminmpec.h>
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#include <epan/prefs.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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#define CIRCUIT_STATUS_BIT(msg_info) (msg_info & 0x0001) /* Circuit Status */
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#define CIRCUIT_TYPE_BIT(msg_info) (msg_info & 0x0001) /* Circuit Condition */
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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_avp_sub = -1;
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static gint ett_l2tp_lcp = -1;
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static gint ett_l2tp_l2_spec = -1;
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static enum_val_t l2tpv3_cookies[] = {
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{"cookie0", "None", 0},
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{"cookie4", "4 Byte Cookie", 4},
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{"cookie8", "8 Byte Cookie", 8},
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{NULL, NULL, 0}
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};
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#define L2TPv3_PROTOCOL_ETH 0
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#define L2TPv3_PROTOCOL_CHDLC 1
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#define L2TPv3_PROTOCOL_FR 2
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#define L2TPv3_PROTOCOL_PPP 3
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#define L2TPv3_PROTOCOL_IP 4
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#define L2TPv3_PROTOCOL_MPLS 5
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#define L2TPv3_PROTOCOL_AAL5 6
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static enum_val_t l2tpv3_protocols[] = {
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{"eth", "Ethernet", L2TPv3_PROTOCOL_ETH},
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{"chdlc", "Cisco HDLC", L2TPv3_PROTOCOL_CHDLC},
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{"fr", "Frame Relay", L2TPv3_PROTOCOL_FR},
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{"ppp", "PPP", L2TPv3_PROTOCOL_PPP},
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{"ip", "IP", L2TPv3_PROTOCOL_IP},
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{"mpls", "MPLS", L2TPv3_PROTOCOL_MPLS},
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{"aal5", "AAL5", L2TPv3_PROTOCOL_AAL5},
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{NULL, NULL, 0}
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};
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#define L2TPv3_L2_SPECIFIC_NONE 0
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#define L2TPv3_L2_SPECIFIC_DEFAULT 1
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#define L2TPv3_L2_SPECIFIC_ATM 2
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static enum_val_t l2tpv3_l2_specifics[] = {
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{"none", "None", L2TPv3_L2_SPECIFIC_NONE},
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{"default", "Default L2-Specific", L2TPv3_L2_SPECIFIC_DEFAULT},
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{"atm", "ATM-Specific", L2TPv3_L2_SPECIFIC_ATM},
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{NULL, NULL, 0}
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};
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static gint l2tpv3_cookie = 4;
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static gint l2tpv3_protocol = L2TPv3_PROTOCOL_CHDLC;
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static gint l2tpv3_l2_specific = L2TPv3_L2_SPECIFIC_DEFAULT;
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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 20
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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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"Modem_Status ",
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"Service_Relay_Request_Msg ",
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"Service_Relay_Reply_Message ",
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"Explicit_Acknowledgement ",
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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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"MDMST ",
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"SRRQ ",
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"SRRP ",
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"ACK ",
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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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static const value_string data_sequencing_vals[] = {
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{ 0, "No incoming data packets require sequencing" },
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{ 1, "Only non-IP data packets require sequencing" },
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{ 2, "All incoming data packets require sequencing" },
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{ 0, NULL }
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};
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static const value_string l2_sublayer_vals[] = {
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{ 0, "No L2-Specific Sublayer Present" },
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{ 1, "Default L2-Specific is used" },
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{ 0, NULL }
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};
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static const value_string result_code_stopccn_vals[] = {
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{ 0, "Reserved", },
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{ 1, "General request to clear control connection", },
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{ 2, "General error, Error Code indicates the problem", },
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{ 3, "Control connection already exists", },
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{ 4, "Requester is not authorized to establish a control connection", },
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{ 5, "The protocol version of the requester is not supported", },
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{ 6, "Requester is being shut down", },
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{ 7, "Finite state machine error or timeout", },
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{ 8, "Control connection due to mismatching CCDS value", },
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{ 0, NULL }
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};
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static const value_string result_code_cdn_vals[] = {
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{ 0, "Reserved", },
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{ 1, "Session disconnected due to loss of carrier or circuit disconnect", },
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{ 2, "Session disconnected for the reason indicated in Error Code", },
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{ 3, "Session disconnected for administrative reasons", },
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{ 4, "Appropriate facilities unavailable (temporary condition)", },
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{ 5, "Appropriate facilities unavailable (permanent condition)", },
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{ 6, "Invalid destination", },
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{ 7, "Call failed due to no carrier detected", },
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{ 8, "Call failed due to detection of a busy signal", },
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{ 9, "Call failed due to lack of a dial tone", },
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{ 10, "Call was not established within time allotted by LAC", },
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{ 11, "Call was connected but no appropriate framing was detected", },
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{ 12, "Disconnecting call due to mismatching SDS value", },
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{ 13, "Session not established due to losing tie breaker", },
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{ 14, "Session not established due to unsupported PW type", },
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{ 15, "Session not established, sequencing required without valid L2-Specific Sublayer", },
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{ 16, "Finite state machine error or timeout", },
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{ 0, NULL }
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};
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static const value_string error_code_vals[] = {
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{ 0, "No General Error", },
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{ 1, "No control connection exists yet for this pair of LCCEs", },
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{ 2, "Length is wrong", },
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{ 3, "One of the field values was out of range", },
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{ 4, "Insufficient resources to handle this operation now", },
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{ 5, "Invalid Session ID", },
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{ 6, "A generic vendor-specific error occurred", },
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{ 7, "Try another", },
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{ 8, "Receipt of an unknown AVP with the M bit set", },
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{ 9, "Try another directed", },
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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 EXTENDED_VENDOR_ID 58
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#define MESSAGE_DIGEST 59
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#define ROUTER_ID 60
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#define ASSIGNED_CONTROL_CONN_ID 61
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#define PW_CAPABILITY_LIST 62
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#define LOCAL_SESSION_ID 63
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#define REMOTE_SESSION_ID 64
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#define ASSIGNED_COOKIE 65
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#define REMOTE_END_ID 66
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#define PW_TYPE 68
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#define L2_SPECIFIC_SUBLAYER 69
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#define DATA_SEQUENCING 70
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#define CIRCUIT_STATUS 71
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#define PREFERRED_LANGUAGE 72
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#define CTL_MSG_AUTH_NONCE 73
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#define TX_CONNECT_SPEED_V3 74
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#define RX_CONNECT_SPEED_V3 75
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#define NUM_AVP_TYPES 76
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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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{ EXTENDED_VENDOR_ID, "Extended Vendor ID" },
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{ MESSAGE_DIGEST, "Message Digest" },
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{ ROUTER_ID, "Router ID" },
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{ ASSIGNED_CONTROL_CONN_ID, "Assigned Control Connection ID" },
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{ PW_CAPABILITY_LIST, "Pseudowire Capability List" },
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{ LOCAL_SESSION_ID, "Local Session ID" },
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{ REMOTE_SESSION_ID, "Remote Session ID" },
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{ ASSIGNED_COOKIE, "Assigned Cookie" },
|
|
{ REMOTE_END_ID, "Remote End ID" },
|
|
{ PW_TYPE, "Pseudowire Type" },
|
|
{ L2_SPECIFIC_SUBLAYER, "Layer2 Specific Sublayer" },
|
|
{ DATA_SEQUENCING, "Data Sequencing" },
|
|
{ CIRCUIT_STATUS, "Circuit Status" },
|
|
{ PREFERRED_LANGUAGE, "Preferred Language" },
|
|
{ CTL_MSG_AUTH_NONCE, "Control Message Authentication Nonce" },
|
|
{ TX_CONNECT_SPEED_V3, "Tx Connect Speed Version 3" },
|
|
{ RX_CONNECT_SPEED_V3, "Rx Connect Speed Version 3" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define CISCO_ASSIGNED_CONNECTION_ID 1
|
|
#define CISCO_PW_CAPABILITY_LIST 2
|
|
#define CISCO_LOCAL_SESSION_ID 3
|
|
#define CISCO_REMOTE_SESSION_ID 4
|
|
#define CISCO_ASSIGNED_COOKIE 5
|
|
#define CISCO_REMOTE_END_ID 6
|
|
#define CISCO_PW_TYPE 7
|
|
#define CISCO_CIRCUIT_STATUS 8
|
|
#define CISCO_SESSION_TIE_BREAKER 9
|
|
#define CISCO_DRAFT_AVP_VERSION 10
|
|
#define CISCO_MESSAGE_DIGEST 12
|
|
#define CISCO_AUTH_NONCE 13
|
|
#define CISCO_INTERFACE_MTU 14
|
|
|
|
static const value_string cisco_avp_type_vals[] = {
|
|
{ CISCO_ASSIGNED_CONNECTION_ID, "Assigned Connection ID" },
|
|
{ CISCO_PW_CAPABILITY_LIST, "Pseudowire Capabilities List" },
|
|
{ CISCO_LOCAL_SESSION_ID, "Local Session ID" },
|
|
{ CISCO_REMOTE_SESSION_ID, "Remote Session ID" },
|
|
{ CISCO_ASSIGNED_COOKIE, "Assigned Cookie" },
|
|
{ CISCO_REMOTE_END_ID, "Remote End ID" },
|
|
{ CISCO_PW_TYPE, "Pseudowire Type" },
|
|
{ CISCO_CIRCUIT_STATUS, "Circuit Status" },
|
|
{ CISCO_SESSION_TIE_BREAKER, "Session Tie Breaker" },
|
|
{ CISCO_DRAFT_AVP_VERSION, "Draft AVP Version" },
|
|
{ CISCO_MESSAGE_DIGEST, "Message Digest" },
|
|
{ CISCO_AUTH_NONCE, "Control Message Authentication Nonce" },
|
|
{ CISCO_INTERFACE_MTU, "Interface MTU" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define NUM_PW_TYPES 0x1A
|
|
static const value_string pw_types_vals[NUM_PW_TYPES+1] = {
|
|
{ 0, "End of PW Capability List" },
|
|
{ 1, "Frame Relay DLCI (Martini Mode)" },
|
|
{ 2, "ATM AAL5 SDU VCC transport" },
|
|
{ 3, "ATM transparent cell transport" },
|
|
{ 4, "Ethernet Tagged Mode" },
|
|
{ 5, "Ethernet" },
|
|
{ 6, "HDLC" },
|
|
{ 7, "PPP" },
|
|
{ 8, "SONET/SDH Circuit Emulation Service Over MPLS (CEM) [Note1]" },
|
|
{ 9, "ATM n-to-one VCC cell transport" },
|
|
{ 10, "ATM n-to-one VPC cell transport" },
|
|
{ 11, "IP Layer2 Transport" },
|
|
{ 12, "ATM one-to-one VCC Cell Mode" },
|
|
{ 13, "ATM one-to-one VPC Cell Mode" },
|
|
{ 14, "ATM AAL5 PDU VCC transport" },
|
|
{ 15, "Frame-Relay Port mode" },
|
|
{ 16, "SONET/SDH Circuit Emulation over Packet (CEP)" },
|
|
{ 17, "Structure-agnostic E1 over Packet (SAToP)" },
|
|
{ 18, "Structure-agnostic T1 (DS1) over Packet (SAToP)" },
|
|
{ 19, "Structure-agnostic E3 over Packet (SAToP)" },
|
|
{ 20, "Structure-agnostic T3 (DS3) over Packet (SAToP)" },
|
|
{ 21, "CESoPSN basic mode" },
|
|
{ 22, "TDMoIP basic mode" },
|
|
{ 23, "CESoPSN TDM with CAS" },
|
|
{ 24, "TDMoIP TDM with CAS" },
|
|
{ 25, "Frame Relay DLCI" },
|
|
{ 0, "NULL" },
|
|
};
|
|
|
|
static dissector_handle_t ppp_hdlc_handle;
|
|
static dissector_handle_t ppp_lcp_options_handle;
|
|
|
|
static dissector_handle_t eth_withoutfcs_handle;
|
|
static dissector_handle_t chdlc_handle;
|
|
static dissector_handle_t fr_handle;
|
|
static dissector_handle_t ip_handle;
|
|
static dissector_handle_t mpls_handle;
|
|
static dissector_handle_t llc_handle;
|
|
static dissector_handle_t data_handle;
|
|
|
|
/*
|
|
* Processes AVPs for Control Messages all versions and transports
|
|
*/
|
|
static void process_control_avps(tvbuff_t *tvb,
|
|
packet_info *pinfo,
|
|
proto_tree *l2tp_tree,
|
|
int index,
|
|
int length)
|
|
{
|
|
proto_tree *l2tp_lcp_avp_tree, *l2tp_avp_tree, *l2tp_avp_tree_sub;
|
|
proto_item *tf, *te;
|
|
|
|
int msg_type;
|
|
gboolean isStopCcn = FALSE;
|
|
int avp_type;
|
|
guint32 avp_vendor_id;
|
|
guint16 avp_len;
|
|
guint16 ver_len_hidden;
|
|
int rhcode = 10;
|
|
tvbuff_t *next_tvb;
|
|
guint16 result_code;
|
|
guint16 error_code;
|
|
guint32 bits;
|
|
guint16 firmware_rev;
|
|
|
|
if (l2tp_tree) {
|
|
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 if (avp_vendor_id == VENDOR_CISCO) { /* Vendor-Specific AVP */
|
|
tf = proto_tree_add_text(l2tp_tree, tvb, index,
|
|
avp_len, "Vendor %s: %s AVP",
|
|
val_to_str(avp_vendor_id, sminmpec_values, "Unknown (%u)"),
|
|
val_to_str(avp_type, cisco_avp_type_vals, "Unknown (%u)"));
|
|
} else { /* Vendor-Specific AVP */
|
|
tf = proto_tree_add_text(l2tp_tree, tvb, index,
|
|
avp_len, "Vendor %s AVP Type %u",
|
|
val_to_str(avp_vendor_id, sminmpec_values, "Unknown (%u)"),
|
|
avp_type);
|
|
}
|
|
|
|
|
|
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 < 6) {
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 0,
|
|
"AVP length must be >= 6");
|
|
return;
|
|
}
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
/* Special Case for handling Extended Vendor Id */
|
|
if (avp_type == EXTENDED_VENDOR_ID) {
|
|
index += 2;
|
|
avp_len -= 2;
|
|
proto_tree_add_item(l2tp_avp_tree, hf_l2tp_avp_vendor_id,
|
|
tvb, index, 4, FALSE);
|
|
|
|
avp_vendor_id = tvb_get_ntohl(tvb, index);
|
|
|
|
index += 4;
|
|
avp_len -= 4;
|
|
continue;
|
|
}
|
|
else {
|
|
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_CISCO) {
|
|
proto_tree_add_uint(l2tp_avp_tree, hf_l2tp_cisco_avp_type,
|
|
tvb, index, 2, avp_type);
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
/* For the time being, we don't decode any Vendor-
|
|
specific AVP. */
|
|
switch (avp_type) {
|
|
case CISCO_ASSIGNED_CONNECTION_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Assigned Control Connection ID: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
|
|
case CISCO_PW_CAPABILITY_LIST:
|
|
te = proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Pseudowire Capabilities List");
|
|
l2tp_avp_tree_sub = proto_item_add_subtree(te, ett_l2tp_avp_sub);
|
|
while (avp_len >= 2) {
|
|
int pw_type = tvb_get_ntohs(tvb, index);
|
|
|
|
proto_tree_add_text(l2tp_avp_tree_sub, tvb, index,
|
|
2, "PW Type: (%u) %s",
|
|
pw_type,
|
|
(pw_type < NUM_PW_TYPES) ?
|
|
pw_types_vals[pw_type].strptr : "Unknown");
|
|
index += 2;
|
|
avp_len -= 2;
|
|
}
|
|
break;
|
|
|
|
case CISCO_LOCAL_SESSION_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Local Session ID: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
case CISCO_REMOTE_SESSION_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Remote Session ID: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
case CISCO_ASSIGNED_COOKIE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Assigned Cookie: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
case CISCO_REMOTE_END_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Remote End ID: %s",
|
|
tvb_format_text(tvb, index, avp_len));
|
|
break;
|
|
case CISCO_PW_TYPE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Pseudowire Type: %u - %s",
|
|
tvb_get_ntohs(tvb, index),
|
|
val_to_str(tvb_get_ntohs(tvb, index),
|
|
pw_types_vals, "Unknown (%u)"));
|
|
break;
|
|
case CISCO_CIRCUIT_STATUS:
|
|
bits = tvb_get_ntohs(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Circuit Status: %s",
|
|
(CIRCUIT_STATUS_BIT(bits)) ? "Up" : "Down");
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Circuit Type: %s",
|
|
(CIRCUIT_TYPE_BIT(bits)) ? "New" : "Existing");
|
|
break;
|
|
case CISCO_SESSION_TIE_BREAKER:
|
|
proto_tree_add_item(l2tp_avp_tree, hf_l2tp_tie_breaker,
|
|
tvb, index, 8, FALSE);
|
|
break;
|
|
case CISCO_DRAFT_AVP_VERSION:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Draft AVP Version: %u",
|
|
tvb_get_ntohs(tvb, index));
|
|
break;
|
|
case CISCO_MESSAGE_DIGEST:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Message Digest: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
case CISCO_AUTH_NONCE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Nonce: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
case CISCO_INTERFACE_MTU:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Interface MTU: %u",
|
|
tvb_get_ntohs(tvb, index));
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index,
|
|
avp_len, "Vendor-Specific AVP");
|
|
break;
|
|
}
|
|
index += avp_len;
|
|
continue;
|
|
} else if (avp_vendor_id != VENDOR_IETF) {
|
|
if (avp_len >= 2) {
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Type: %u", avp_type);
|
|
index += 2;
|
|
avp_len -= 2;
|
|
if (avp_len > 0) {
|
|
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");
|
|
|
|
if (msg_type == AVP_StopCCN) {
|
|
isStopCcn = TRUE;
|
|
}
|
|
break;
|
|
|
|
case RESULT_ERROR_CODE:
|
|
if (avp_len < 2)
|
|
break;
|
|
result_code = tvb_get_ntohs(tvb, index);
|
|
if (isStopCcn) {
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Result code: %u - %s", result_code,
|
|
val_to_str(result_code, result_code_stopccn_vals, "Unknown (%u)"));
|
|
}
|
|
else {
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Result code: %u - %s", result_code,
|
|
val_to_str(result_code, result_code_cdn_vals, "Unknown (%u)"));
|
|
}
|
|
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 - %s", error_code,
|
|
val_to_str(error_code, error_code_vals, "Unknown (%u)"));
|
|
index += 2;
|
|
avp_len -= 2;
|
|
|
|
if (avp_len == 0)
|
|
break;
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Error Message: %s",
|
|
tvb_format_text(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",
|
|
tvb_format_text(tvb, index, avp_len));
|
|
break;
|
|
|
|
case VENDOR_NAME:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Vendor Name: %s",
|
|
tvb_format_text(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",
|
|
tvb_format_text(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",
|
|
tvb_format_text(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",
|
|
tvb_format_text(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",
|
|
tvb_format_text(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",
|
|
tvb_format_text(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",
|
|
tvb_format_text(tvb, index, avp_len));
|
|
break;
|
|
|
|
case MESSAGE_DIGEST:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Message Digest: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
case ROUTER_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Router ID: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
case ASSIGNED_CONTROL_CONN_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Assigned Control Connection ID: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
case PW_CAPABILITY_LIST:
|
|
te = proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Pseudowire Capabilities List");
|
|
l2tp_avp_tree_sub = proto_item_add_subtree(te, ett_l2tp_avp_sub);
|
|
|
|
while (avp_len >= 2) {
|
|
int pw_type = tvb_get_ntohs(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree_sub, tvb, index,
|
|
2, "PW Type: (%u) %s",
|
|
pw_type,
|
|
(pw_type < NUM_PW_TYPES) ?
|
|
pw_types_vals[pw_type].strptr : "Unknown");
|
|
index += 2;
|
|
avp_len -= 2;
|
|
}
|
|
break;
|
|
case LOCAL_SESSION_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Local Session ID: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
case REMOTE_SESSION_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 4,
|
|
"Remote Session ID: %u",
|
|
tvb_get_ntohl(tvb, index));
|
|
break;
|
|
case ASSIGNED_COOKIE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Assigned Cookie: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
case REMOTE_END_ID:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Remote End ID: %s",
|
|
tvb_format_text(tvb, index, avp_len));
|
|
break;
|
|
case PW_TYPE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Pseudowire Type: %u - %s",
|
|
tvb_get_ntohs(tvb, index),
|
|
val_to_str(tvb_get_ntohs(tvb, index),
|
|
pw_types_vals, "Unknown"));
|
|
break;
|
|
case L2_SPECIFIC_SUBLAYER:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Layer2 Specific Sublayer: %s",
|
|
val_to_str(tvb_get_ntohs(tvb, index),
|
|
l2_sublayer_vals, "Invalid (%u)"));
|
|
break;
|
|
case DATA_SEQUENCING:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Data Sequencing: %s",
|
|
val_to_str(tvb_get_ntohs(tvb, index),
|
|
data_sequencing_vals, "Invalid (%u)"));
|
|
break;
|
|
case CIRCUIT_STATUS:
|
|
bits = tvb_get_ntohs(tvb, index);
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Circuit Status: %s",
|
|
(CIRCUIT_STATUS_BIT(bits)) ? "Up" : "Down");
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
|
|
"Circuit Type: %s",
|
|
(CIRCUIT_TYPE_BIT(bits)) ? "New" : "Existing");
|
|
break;
|
|
case PREFERRED_LANGUAGE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Preferred Language: %s",
|
|
tvb_format_text(tvb, index, avp_len));
|
|
break;
|
|
case CTL_MSG_AUTH_NONCE:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Nonce: %s",
|
|
tvb_bytes_to_str(tvb, index, avp_len));
|
|
break;
|
|
case TX_CONNECT_SPEED_V3:
|
|
{
|
|
guint32 l_int, h_int;
|
|
if (avp_len < 8)
|
|
break;
|
|
|
|
h_int = tvb_get_ntohl(tvb, index);
|
|
l_int = tvb_get_ntohl(tvb, index+4);
|
|
if (!h_int && !l_int) {
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 8,
|
|
"Tx Connect Speed v3: indeterminable or no physical p2p link");
|
|
}
|
|
else {
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 8,
|
|
"Tx Connect Speed v3: %#x%04x",
|
|
h_int, l_int);
|
|
}
|
|
break;
|
|
}
|
|
case RX_CONNECT_SPEED_V3:
|
|
{
|
|
guint32 l_int, h_int;
|
|
if (avp_len < 8)
|
|
break;
|
|
|
|
h_int = tvb_get_ntohl(tvb, index);
|
|
l_int = tvb_get_ntohl(tvb, index+4);
|
|
if (!h_int && !l_int) {
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 8,
|
|
"Rx Connect Speed v3: indeterminable or no physical p2p link");
|
|
}
|
|
else {
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, 8,
|
|
"Rx Connect Speed v3: %#x%04x",
|
|
h_int, l_int);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
proto_tree_add_text(l2tp_avp_tree, tvb, index, avp_len,
|
|
"Unknown AVP");
|
|
break;
|
|
}
|
|
|
|
index += avp_len;
|
|
}
|
|
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Processes Data Messages for v3 IP and UDP, starting from the Session ID
|
|
* (common to IP and UDP). Dissects the L2TPv3 Session header, the (optional)
|
|
* L2-Specific sublayer and calls the appropriate dissector for the payload.
|
|
*/
|
|
static void
|
|
process_l2tpv3_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
proto_tree *l2tp_tree, proto_item *l2tp_item, int *pIndex)
|
|
{
|
|
int index = *pIndex;
|
|
int sid, oam_cell = 0;
|
|
proto_tree *l2_specific = NULL;
|
|
proto_item *ti = NULL;
|
|
tvbuff_t *next_tvb;
|
|
|
|
/* Get Session ID */
|
|
sid = tvb_get_ntohl(tvb, index);
|
|
index += 4;
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo,COL_INFO,
|
|
"%s (session id=%u)",
|
|
data_msg, sid);
|
|
}
|
|
|
|
if (tree) {
|
|
proto_tree_add_item(l2tp_tree, hf_l2tp_sid, tvb, index-4, 4, FALSE);
|
|
proto_item_set_len(l2tp_item, index);
|
|
if (!(tvb_offset_exists(tvb, index)))
|
|
return;
|
|
if (l2tpv3_cookie != 0)
|
|
proto_tree_add_item(l2tp_tree, hf_l2tp_cookie, tvb, index, l2tpv3_cookie, FALSE);
|
|
|
|
switch(l2tpv3_l2_specific){
|
|
|
|
case L2TPv3_L2_SPECIFIC_DEFAULT:
|
|
ti = proto_tree_add_item(tree, hf_l2tp_l2_spec_def,
|
|
tvb, index + l2tpv3_cookie, 4, FALSE);
|
|
l2_specific = proto_item_add_subtree(ti, ett_l2tp_l2_spec);
|
|
|
|
proto_tree_add_item(l2_specific, hf_l2tp_l2_spec_s, tvb, index + l2tpv3_cookie,
|
|
1, FALSE);
|
|
proto_tree_add_item(l2_specific, hf_l2tp_l2_spec_sequence, tvb,
|
|
index + l2tpv3_cookie + 1, 3, FALSE);
|
|
break;
|
|
case L2TPv3_L2_SPECIFIC_ATM:
|
|
ti = proto_tree_add_item(tree, hf_l2tp_l2_spec_atm,
|
|
tvb, index + l2tpv3_cookie, 4, FALSE);
|
|
l2_specific = proto_item_add_subtree(ti, ett_l2tp_l2_spec);
|
|
|
|
proto_tree_add_item(l2_specific, hf_l2tp_l2_spec_s, tvb, index + l2tpv3_cookie,
|
|
1, FALSE);
|
|
proto_tree_add_item(l2_specific, hf_l2tp_l2_spec_t, tvb, index + l2tpv3_cookie,
|
|
1, FALSE);
|
|
oam_cell = tvb_get_ntohl(tvb, 4 + l2tpv3_cookie) & 0x08000000;
|
|
proto_tree_add_item(l2_specific, hf_l2tp_l2_spec_g, tvb, index + l2tpv3_cookie,
|
|
1, FALSE);
|
|
proto_tree_add_item(l2_specific, hf_l2tp_l2_spec_c, tvb, index + l2tpv3_cookie,
|
|
1, FALSE);
|
|
proto_tree_add_item(l2_specific, hf_l2tp_l2_spec_u, tvb, index + l2tpv3_cookie,
|
|
1, FALSE);
|
|
proto_tree_add_item(l2_specific, hf_l2tp_l2_spec_sequence, tvb,
|
|
index + l2tpv3_cookie + 1, 3, FALSE);
|
|
break;
|
|
case L2TPv3_L2_SPECIFIC_NONE:
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
switch(l2tpv3_l2_specific){
|
|
case L2TPv3_L2_SPECIFIC_DEFAULT:
|
|
case L2TPv3_L2_SPECIFIC_ATM:
|
|
next_tvb = tvb_new_subset(tvb, index + l2tpv3_cookie + 4, -1, -1);
|
|
break;
|
|
case L2TPv3_L2_SPECIFIC_NONE:
|
|
default:
|
|
next_tvb = tvb_new_subset(tvb, index + l2tpv3_cookie, -1, -1);
|
|
break;
|
|
}
|
|
|
|
switch(l2tpv3_protocol){
|
|
case L2TPv3_PROTOCOL_ETH:
|
|
call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
case L2TPv3_PROTOCOL_CHDLC:
|
|
call_dissector(chdlc_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
case L2TPv3_PROTOCOL_FR:
|
|
call_dissector(fr_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
case L2TPv3_PROTOCOL_PPP:
|
|
/*
|
|
* PPP is transported without Address and Control
|
|
* fields, ppp_hdlc_handle can handle that as if if
|
|
* was ACFC (NULL Address and Control)
|
|
*/
|
|
call_dissector(ppp_hdlc_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
case L2TPv3_PROTOCOL_IP:
|
|
call_dissector(ip_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
case L2TPv3_PROTOCOL_MPLS:
|
|
call_dissector(mpls_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
case L2TPv3_PROTOCOL_AAL5:
|
|
if (oam_cell) {
|
|
/* XXX - the ATM dissector should offer an OAM cell dissector */
|
|
call_dissector(data_handle, next_tvb, pinfo, tree);
|
|
} else {
|
|
call_dissector(llc_handle, next_tvb, pinfo, tree);
|
|
}
|
|
break;
|
|
default:
|
|
call_dissector(data_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Processes v3 data message over UDP, to then call process_l2tpv3_data
|
|
* from the common part (Session ID)
|
|
*/
|
|
static void
|
|
process_l2tpv3_data_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_tree *l2tp_tree = NULL, *ctrl_tree;
|
|
proto_item *l2tp_item = NULL, *ti;
|
|
|
|
int index = 0;
|
|
int control;
|
|
int sid;
|
|
|
|
control = tvb_get_ntohs(tvb, index);
|
|
index += 2; /* skip ahead */
|
|
index += 2; /* Skip the reserved */
|
|
sid = tvb_get_ntohl(tvb, index);
|
|
|
|
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);
|
|
proto_item_append_text(l2tp_item, " version 3");
|
|
|
|
ti = proto_tree_add_text(l2tp_tree, tvb, 0, 2,
|
|
"Packet Type: %s Session Id=%u",
|
|
data_msg, sid);
|
|
|
|
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);
|
|
proto_tree_add_boolean(ctrl_tree, hf_l2tp_seq_bit, tvb, 0, 2, control);
|
|
proto_tree_add_uint(ctrl_tree, hf_l2tp_version, tvb, 0, 2, control);
|
|
/* Data in v3 over UDP has this reserved */
|
|
proto_tree_add_item(l2tp_tree, hf_l2tp_res, tvb, 2, 2, FALSE);
|
|
}
|
|
|
|
/* Call process_l2tpv3_data from Session ID (offset in index of 4) */
|
|
process_l2tpv3_data(tvb, pinfo, tree, l2tp_tree, l2tp_item, &index);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Processes v3 data message over IP, to then call process_l2tpv3_data
|
|
* from the common part (Session ID)
|
|
*/
|
|
static void
|
|
process_l2tpv3_data_ip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_tree *l2tp_tree = NULL;
|
|
proto_item *l2tp_item = NULL, *ti;
|
|
|
|
int index = 0;
|
|
int sid;
|
|
|
|
sid = tvb_get_ntohl(tvb, index);
|
|
|
|
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);
|
|
proto_item_append_text(l2tp_item, " version 3");
|
|
|
|
ti = proto_tree_add_text(l2tp_tree, tvb, 0, 4,
|
|
"Packet Type: %s Session Id=%u",
|
|
data_msg, sid);
|
|
}
|
|
|
|
/* Call process_l2tpv3_data from Session ID (offset in index of 0) */
|
|
process_l2tpv3_data(tvb, pinfo, tree, l2tp_tree, l2tp_item, &index);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Processes v3 Control Message over IP, that carries NULL Session ID
|
|
* to then call process_control_avps after dissecting the control.
|
|
*/
|
|
static void
|
|
process_l2tpv3_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int baseIndex)
|
|
{
|
|
proto_tree *l2tp_tree=NULL, *ctrl_tree;
|
|
proto_item *l2tp_item = NULL, *ti;
|
|
|
|
int index = baseIndex;
|
|
int tmp_index;
|
|
guint16 length = 0; /* Length field */
|
|
guint32 ccid = 0; /* Control Connection ID */
|
|
guint16 avp_type;
|
|
guint16 msg_type;
|
|
guint16 control = 0;
|
|
|
|
control = tvb_get_ntohs(tvb, index);
|
|
index += 2; /* skip ahead */
|
|
if (LENGTH_BIT(control)) { /* length field included ? */
|
|
length = tvb_get_ntohs(tvb, index);
|
|
index += 2;
|
|
}
|
|
|
|
/* Get Control Channel ID */
|
|
ccid = tvb_get_ntohl(tvb, index);
|
|
index += 4;
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
tmp_index = index;
|
|
|
|
if ((LENGTH_BIT(control))&&(length==12)) /* ZLB Message */
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s - ZLB (tunnel id=%u)",
|
|
control_msg , ccid);
|
|
else
|
|
{
|
|
if (SEQUENCE_BIT(control)) {
|
|
tmp_index += 4;
|
|
}
|
|
|
|
tmp_index+=4;
|
|
|
|
avp_type = tvb_get_ntohs(tvb, tmp_index);
|
|
tmp_index += 2;
|
|
|
|
if (avp_type == CONTROL_MESSAGE) {
|
|
/* We print message type */
|
|
msg_type = tvb_get_ntohs(tvb, tmp_index);
|
|
tmp_index += 2;
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s - %s (tunnel id=%u)",
|
|
control_msg ,
|
|
((NUM_CONTROL_CALL_TYPES + 1 ) > msg_type) ?
|
|
calltype_short_str[msg_type] : "Unknown",
|
|
ccid);
|
|
}
|
|
else {
|
|
/*
|
|
* This is not a control message.
|
|
* We never pass here except in case of bad l2tp packet!
|
|
*/
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s (tunnel id=%u)",
|
|
control_msg, ccid);
|
|
}
|
|
}
|
|
}
|
|
|
|
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+baseIndex);
|
|
}
|
|
|
|
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);
|
|
proto_item_append_text(l2tp_item, " version 3");
|
|
|
|
if (baseIndex) {
|
|
proto_tree_add_item(l2tp_tree, hf_l2tp_sid, tvb, 0, 4, FALSE);
|
|
}
|
|
ti = proto_tree_add_text(l2tp_tree, tvb, baseIndex, 2,
|
|
"Packet Type: %s Control Connection Id=%d",
|
|
(CONTROL_BIT(control) ? control_msg : data_msg), ccid);
|
|
|
|
ctrl_tree = proto_item_add_subtree(ti, ett_l2tp_ctrl);
|
|
proto_tree_add_uint(ctrl_tree, hf_l2tp_type, tvb, baseIndex, 2, control);
|
|
proto_tree_add_boolean(ctrl_tree, hf_l2tp_length_bit, tvb, baseIndex, 2, control);
|
|
proto_tree_add_boolean(ctrl_tree, hf_l2tp_seq_bit, tvb, baseIndex, 2, control);
|
|
proto_tree_add_uint(ctrl_tree, hf_l2tp_version, tvb, baseIndex, 2, control);
|
|
}
|
|
index = baseIndex + 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_ccid, tvb, index, 4, FALSE);
|
|
}
|
|
index += 4;
|
|
|
|
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 (tree && (LENGTH_BIT(control))&&(length==12)) {
|
|
proto_tree_add_text(l2tp_tree, tvb, 0, 0, "Zero Length Bit message");
|
|
}
|
|
|
|
if (!LENGTH_BIT(control)) {
|
|
return;
|
|
}
|
|
|
|
process_control_avps(tvb, pinfo, l2tp_tree, index, length+baseIndex);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Dissector for L2TP over UDP. For v2, calls process_control_avps for
|
|
* control messages, or the ppp dissector based on the control bit.
|
|
* For v3, calls either process_l2tpv3_control or process_l2tpv3_data_udp
|
|
* based on the control bit.
|
|
*/
|
|
static int
|
|
dissect_l2tp_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_tree *l2tp_tree=NULL, *ctrl_tree;
|
|
proto_item *l2tp_item = NULL, *ti;
|
|
int index = 0;
|
|
int tmp_index;
|
|
guint16 length = 0; /* Length field */
|
|
guint16 tid; /* Tunnel ID */
|
|
guint16 cid; /* Call ID */
|
|
guint16 offset_size; /* Offset size */
|
|
guint16 avp_type;
|
|
guint16 msg_type;
|
|
guint16 control;
|
|
tvbuff_t *next_tvb;
|
|
|
|
/*
|
|
* Don't accept packets that aren't for an L2TP version we know,
|
|
* as they might not be L2TP packets even though they happen
|
|
* to be coming from or going to the L2TP port.
|
|
*/
|
|
if (!tvb_bytes_exist(tvb, 0, 2))
|
|
return 0; /* not enough information to check */
|
|
control = tvb_get_ntohs(tvb, 0);
|
|
switch (L2TP_VERSION(control)) {
|
|
|
|
case 2:
|
|
case 3:
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL)) /* build output for closed L2tp frame displayed */
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "L2TP");
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
switch (L2TP_VERSION(control)) {
|
|
|
|
case 2:
|
|
break;
|
|
|
|
case 3:
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "L2TPv3");
|
|
if (CONTROL_BIT(control)) {
|
|
/* Call to process l2tp v3 control message */
|
|
process_l2tpv3_control(tvb, pinfo, tree, 0);
|
|
}
|
|
else {
|
|
/* Call to process l2tp v3 data message */
|
|
process_l2tpv3_data_udp(tvb, pinfo, tree);
|
|
}
|
|
return tvb_length(tvb);
|
|
}
|
|
|
|
if (LENGTH_BIT(control)) { /* length field included ? */
|
|
index += 2; /* skip ahead */
|
|
length = tvb_get_ntohs(tvb, index);
|
|
}
|
|
|
|
/* collect the tunnel id & call id */
|
|
index += 2;
|
|
tid = tvb_get_ntohs(tvb, index);
|
|
index += 2;
|
|
cid = tvb_get_ntohs(tvb, index);
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
if (CONTROL_BIT(control)) {
|
|
/* CONTROL MESSAGE */
|
|
tmp_index = index;
|
|
|
|
if ((LENGTH_BIT(control))&&(length==12)) /* ZLB Message */
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s - ZLB (tunnel id=%d, session id=%u)",
|
|
control_msg, tid, cid);
|
|
else
|
|
{
|
|
if (SEQUENCE_BIT(control)) {
|
|
tmp_index += 4;
|
|
}
|
|
|
|
tmp_index+=4;
|
|
|
|
avp_type = tvb_get_ntohs(tvb, (tmp_index+=2));
|
|
|
|
if (avp_type == CONTROL_MESSAGE) {
|
|
/* We print message type */
|
|
msg_type = tvb_get_ntohs(tvb, (tmp_index+=2));
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s - %s (tunnel id=%u, session id=%u)",
|
|
control_msg,
|
|
((NUM_CONTROL_CALL_TYPES + 1 ) > msg_type) ?
|
|
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!
|
|
*/
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s (tunnel id=%u, session id=%u)",
|
|
control_msg, tid, cid);
|
|
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
/* DATA Message */
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s (tunnel id=%u, session id=%u)",
|
|
data_msg, tid, cid);
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
|
|
ti = proto_tree_add_text(l2tp_tree, tvb, 0, 2,
|
|
"Packet Type: %s Tunnel Id=%d Session Id=%d",
|
|
(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);
|
|
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 tvb_length(tvb);
|
|
}
|
|
|
|
if (LENGTH_BIT(control))
|
|
process_control_avps(tvb, pinfo, l2tp_tree, index, length);
|
|
|
|
return tvb_length(tvb);
|
|
}
|
|
|
|
|
|
/*
|
|
* Only L2TPv3 runs directly over IP, and dissect_l2tp_ip starts dissecting
|
|
* those packets to call either process_l2tpv3_control for Control Messages
|
|
* or process_l2tpv3_data_ip for Data Messages over IP, based on the
|
|
* Session ID
|
|
*/
|
|
static void
|
|
dissect_l2tp_ip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
int index = 0;
|
|
guint32 sid; /* Session ID */
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL)) /* Only L2TPv3 runs directly over IP */
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "L2TPv3");
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
sid = tvb_get_ntohl(tvb, index);
|
|
if (sid == 0) {
|
|
/* This is control message */
|
|
/* Call to process l2tp v3 control message */
|
|
process_l2tpv3_control(tvb, pinfo, tree, 4);
|
|
}
|
|
else {
|
|
/* Call to process l2tp v3 data message */
|
|
process_l2tpv3_data_ip(tvb, pinfo, tree);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/* 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(sminmpec_values), 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 }},
|
|
|
|
{ &hf_l2tp_sid,
|
|
{ "Session ID","l2tp.sid", FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Session ID", HFILL }},
|
|
|
|
{ &hf_l2tp_ccid,
|
|
{ "Control Connection ID","l2tp.ccid", FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Control Connection ID", HFILL }},
|
|
|
|
{ &hf_l2tp_res,
|
|
{ "Reserved","l2tp.res", FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"Reserved", HFILL }},
|
|
|
|
{ &hf_l2tp_cookie,
|
|
{ "Cookie","lt2p.cookie", FT_BYTES, BASE_HEX, NULL, 0x0,
|
|
"Cookie", HFILL }},
|
|
|
|
{ &hf_l2tp_l2_spec_def,
|
|
{ "Default L2-Specific Sublayer","lt2p.l2_spec_def", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"Default L2-Specific Sublayer", HFILL }},
|
|
|
|
{ &hf_l2tp_l2_spec_atm,
|
|
{ "ATM-Specific Sublayer","lt2p.l2_spec_atm", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"ATM-Specific Sublayer", HFILL }},
|
|
|
|
{ &hf_l2tp_l2_spec_s,
|
|
{ "S-bit","lt2p.l2_spec_s", FT_BOOLEAN, 8, NULL, 0x40,
|
|
"Sequence Bit", HFILL }},
|
|
|
|
{ &hf_l2tp_l2_spec_t,
|
|
{ "T-bit","lt2p.l2_spec_t", FT_BOOLEAN, 8, NULL, 0x08,
|
|
"Transport Type Bit", HFILL }},
|
|
|
|
{ &hf_l2tp_l2_spec_g,
|
|
{ "G-bit","lt2p.l2_spec_g", FT_BOOLEAN, 8, NULL, 0x04,
|
|
"EFCI Bit", HFILL }},
|
|
|
|
{ &hf_l2tp_l2_spec_c,
|
|
{ "C-bit","lt2p.l2_spec_c", FT_BOOLEAN, 8, NULL, 0x02,
|
|
"CLP Bit", HFILL }},
|
|
|
|
{ &hf_l2tp_l2_spec_u,
|
|
{ "U-bit","lt2p.l2_spec_u", FT_BOOLEAN, 8, NULL, 0x01,
|
|
"C/R Bit", HFILL }},
|
|
|
|
{ &hf_l2tp_l2_spec_sequence,
|
|
{ "Sequence Number","lt2p.l2_spec_sequence", FT_UINT24, BASE_DEC, NULL, 0x0,
|
|
"Sequence Number", HFILL }},
|
|
|
|
{ &hf_l2tp_cisco_avp_type,
|
|
{ "Type", "l2tp.avp.ciscotype", FT_UINT16, BASE_DEC, VALS(cisco_avp_type_vals), 0,
|
|
"AVP Type", HFILL }},
|
|
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_l2tp,
|
|
&ett_l2tp_ctrl,
|
|
&ett_l2tp_avp,
|
|
&ett_l2tp_avp_sub,
|
|
&ett_l2tp_l2_spec,
|
|
&ett_l2tp_lcp,
|
|
};
|
|
|
|
module_t *l2tp_module;
|
|
|
|
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));
|
|
|
|
l2tp_module = prefs_register_protocol(proto_l2tp, NULL);
|
|
|
|
prefs_register_enum_preference(l2tp_module,
|
|
"cookie_size",
|
|
"L2TPv3 Cookie Size",
|
|
"L2TPv3 Cookie Size",
|
|
&l2tpv3_cookie,
|
|
l2tpv3_cookies,
|
|
FALSE);
|
|
|
|
prefs_register_enum_preference(l2tp_module,
|
|
"l2_specific",
|
|
"L2TPv3 L2-Specific Sublayer",
|
|
"L2TPv3 L2-Specific Sublayer",
|
|
&l2tpv3_l2_specific,
|
|
l2tpv3_l2_specifics,
|
|
FALSE);
|
|
|
|
prefs_register_enum_preference(l2tp_module,
|
|
"protocol",
|
|
"Decode L2TPv3 packet contents as this protocol",
|
|
"Decode L2TPv3 packet contents as this protocol",
|
|
&l2tpv3_protocol,
|
|
l2tpv3_protocols,
|
|
FALSE);
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_l2tp(void)
|
|
{
|
|
dissector_handle_t l2tp_udp_handle;
|
|
dissector_handle_t l2tp_ip_handle;
|
|
|
|
l2tp_udp_handle = new_create_dissector_handle(dissect_l2tp_udp, proto_l2tp);
|
|
dissector_add("udp.port", UDP_PORT_L2TP, l2tp_udp_handle);
|
|
|
|
l2tp_ip_handle = create_dissector_handle(dissect_l2tp_ip, proto_l2tp);
|
|
dissector_add("ip.proto", IP_PROTO_L2TP, l2tp_ip_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");
|
|
|
|
/*
|
|
* Get a handle for the dissectors used in v3.
|
|
*/
|
|
eth_withoutfcs_handle = find_dissector("eth_withoutfcs");
|
|
chdlc_handle = find_dissector("chdlc");
|
|
fr_handle = find_dissector("fr");
|
|
ip_handle = find_dissector("ip");
|
|
mpls_handle = find_dissector("mpls");
|
|
llc_handle = find_dissector("llc");
|
|
|
|
data_handle = find_dissector("data");
|
|
}
|