Ethereal-dev: [Ethereal-dev] Submitting support for decode of L2TP version 3
Note: This archive is from the project's previous web site, ethereal.com. This list is no longer active.
From: Deepak Jain <jain1971@xxxxxxxxx>
Date: Sat, 8 Jan 2005 19:53:03 -0800 (PST)
Hi,
I have modified the packet_l2tp.c to include support for L2TP version 3 (rfc draft 15). Review the changes and update the file for the next release.
Thanks
Deepak
Deepak Jain
Do you Yahoo!?
Meet the all-new My Yahoo! � Try it today!
/* packet-l2tp.c
* Routines for Layer Two Tunnelling Protocol (L2TP) (RFC 2661) packet
* disassembly
* John Thomes <john@xxxxxxxxxxxxxxx>
*
* Minor changes by: (2000-01-10)
* Laurent Cazalet <laurent.cazalet@xxxxxxxxxxxx>
* Thomas Parvais <thomas.parvais@xxxxxxxxxxx>
*
* $Id: packet-l2tp.c 11615 2004-08-06 19:57:49Z guy $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@xxxxxxxxxxxx>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
static int proto_l2tp = -1;
static int hf_l2tp_type = -1;
static int hf_l2tp_length_bit = -1;
static int hf_l2tp_seq_bit = -1;
static int hf_l2tp_offset_bit = -1;
static int hf_l2tp_priority = -1;
static int hf_l2tp_version = -1;
static int hf_l2tp_length = -1;
static int hf_l2tp_tunnel = -1;
static int hf_l2tp_session = -1;
static int hf_l2tp_Ns = -1;
static int hf_l2tp_Nr = -1;
static int hf_l2tp_offset = -1;
static int hf_l2tp_avp_mandatory = -1;
static int hf_l2tp_avp_hidden = -1;
static int hf_l2tp_avp_length = -1;
static int hf_l2tp_avp_vendor_id = -1;
static int hf_l2tp_avp_type = -1;
static int hf_l2tp_tie_breaker = -1;
static int hf_l2tp_sid = -1;
static int hf_l2tp_ccid = -1;
static int hf_l2tp_cisco_avp_type = -1;
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/addr_resolv.h>
#define UDP_PORT_L2TP 1701
#define IP_PROTOCOL_L2TP 115
#define CONTROL_BIT(msg_info) (msg_info & 0x8000) /* Type bit control = 1 data = 0 */
#define LENGTH_BIT(msg_info) (msg_info & 0x4000) /* Length bit = 1 */
#define RESERVE_BITS(msg_info) (msg_info &0x37F8) /* Reserved bit - usused */
#define SEQUENCE_BIT(msg_info) (msg_info & 0x0800) /* SEQUENCE bit = 1 Ns and Nr fields */
#define OFFSET_BIT(msg_info) (msg_info & 0x0200) /* Offset */
#define PRIORITY_BIT(msg_info) (msg_info & 0x0100) /* Priority */
#define L2TP_VERSION(msg_info) (msg_info & 0x000f) /* Version of l2tp */
#define MANDATORY_BIT(msg_info) (msg_info & 0x8000) /* Mandatory = 1 */
#define HIDDEN_BIT(msg_info) (msg_info & 0x4000) /* Hidden = 1 */
#define AVP_LENGTH(msg_info) (msg_info & 0x03ff) /* AVP Length */
#define FRAMING_SYNC(msg_info) (msg_info & 0x0001) /* SYNC Framing Type */
#define FRAMING_ASYNC(msg_info) (msg_info & 0x0002) /* ASYNC Framing Type */
#define BEARER_DIGITAL(msg_info) (msg_info & 0x0001) /* Digital Bearer Type */
#define BEARER_ANALOG(msg_info) (msg_info & 0x0002) /* Analog Bearer Type */
#define CIRCUIT_STATUS_BIT(msg_info) (msg_info & 0x0001) /* Circuit Status */
#define CIRCUIT_TYPE_BIT(msg_info) (msg_info & 0x0001) /* Circuit Condition */
static gint ett_l2tp = -1;
static gint ett_l2tp_ctrl = -1;
static gint ett_l2tp_avp = -1;
static gint ett_l2tp_lcp = -1;
#define AVP_SCCRQ 1
#define AVP_SCCRP 2
#define AVP_SCCCN 3
#define AVP_StopCCN 4
#define AVP_Reserved 5
#define AVP_HELLO 6
#define AVP_OCRQ 7
#define AVP_OCRP 8
#define AVP_ORCRP 9
#define AVP_ICRQ 10
#define AVP_ICRP 11
#define AVP_ICCN 12
#define AVP_Reserved1 13
#define AVP_CDN 14
#define NUM_CONTROL_CALL_TYPES 20
static const char *calltypestr[NUM_CONTROL_CALL_TYPES+1] = {
"Unknown Call Type ",
"Start_Control_Request ",
"Start_Control_Reply ",
"Start_Control_Connected ",
"Stop_Control_Notification ",
"Reserved ",
"Hello ",
"Outgoing_Call_Request ",
"Outgoing_Call_Reply ",
"Outgoing_Call_Connected ",
"Incoming_Call_Request ",
"Incoming_Call_Reply ",
"Incoming_Call_Connected ",
"Reserved ",
"Call_Disconnect_Notification",
"WAN_Error_Notify ",
"Set_Link_Info ",
"Unknown Call Type ",
"Unknown Call Type ",
"Unknown Call Type ",
"Explicit Acknowledgement ",
};
static const char *calltype_short_str[NUM_CONTROL_CALL_TYPES+1] = {
"Unknown ",
"SCCRQ ",
"SCCRP ",
"SCCCN ",
"StopCCN ",
"Reserved",
"Hello ",
"OCRQ ",
"OCRP ",
"OCCN ",
"ICRQ ",
"ICRP ",
"ICCN ",
"Reserved",
"CDN ",
"WEN ",
"SLI ",
"Unknown ",
"Unknown ",
"Unknown ",
"ACK ",
};
static const char *control_msg = "Control Message";
static const char *data_msg = "Data Message";
static const value_string l2tp_type_vals[] = {
{ 0, "Data Message" },
{ 1, "Control Message" },
{ 0, NULL },
};
static const value_string cause_code_direction_vals[] = {
{ 0, "global error" },
{ 1, "at peer" },
{ 2, "at local" },
{ 0, NULL },
};
static const true_false_string l2tp_length_bit_truth =
{ "Length field is present", "Length field is not present" };
static const true_false_string l2tp_seq_bit_truth =
{ "Ns and Nr fields are present", "Ns and Nr fields are not present" };
static const true_false_string l2tp_offset_bit_truth =
{ "Offset Size field is present", "Offset size field is not present" };
static const true_false_string l2tp_priority_truth =
{ "This data message has priority", "No priority" };
static const value_string authen_type_vals[] = {
{ 0, "Reserved" },
{ 1, "Textual username and password" },
{ 2, "PPP CHAP" },
{ 3, "PPP PAP" },
{ 4, "No Authentication" },
{ 5, "Microsoft CHAP Version 1" },
{ 0, NULL }
};
static const value_string data_sequencing_vals[] = {
{ 0, "No incoming data packets require sequencing" },
{ 1, "Only non-IP data packets require sequencing" },
{ 2, "All incoming data packets require sequencing" },
{ 0, NULL }
};
static const value_string l2_sublayer_vals[] = {
{ 0, "No L2-Specific Sublayer Present" },
{ 1, "Default L2-Specific is used" },
{ 0, NULL }
};
static const value_string result_code_stopccn_vals[] = {
{ 0, "Reserved", },
{ 1, "General request to clear control connection", },
{ 2, "General error, Error Code indicates the problem", },
{ 3, "Control connection already exists", },
{ 4, "Requester is not authorized to establish a control connection", },
{ 5, "The protocol version of the requester is not supported", },
{ 6, "Requester is being shut down", },
{ 7, "Finite state machine error or timeout", },
{ 0, NULL }
};
static const value_string result_code_cdn_vals[] = {
{ 0, "Reserved", },
{ 1, "Session disconnected due to loss of carrier or circuit disconnect", },
{ 2, "Session disconnected for the reason indicated in Error Code", },
{ 3, "Session disconnected for administrative reasons", },
{ 4, "Appropriate facilities unavailable (temporary condition)", },
{ 5, "Appropriate facilities unavailable (permanent condition)", },
{ 13, "Session not established due to losing tie breaker", },
{ 14, "Session not established due to unsupported PW type", },
{ 15, "Session not established, sequencing required without valid L2-Specific Sublayer", },
{ 16, "Finite state machine error or timeout", },
{ 0, NULL }
};
static const value_string error_code_vals[] = {
{ 0, "No General Error", },
{ 1, "No control connection exists yet for this pair of LCCEs", },
{ 2, "Length is wrong", },
{ 3, "One of the field values was out of range", },
{ 4, "Insufficient resources to handle this operation now", },
{ 5, "Invalid Session ID", },
{ 6, "A generic vendor-specific error occurred", },
{ 7, "Try another", },
{ 8, "Receipt of an unknown AVP with the M bit set", },
{ 9, "Try another directed", },
{ 0, NULL }
};
#define CONTROL_MESSAGE 0
#define RESULT_ERROR_CODE 1
#define PROTOCOL_VERSION 2
#define FRAMING_CAPABILITIES 3
#define BEARER_CAPABILITIES 4
#define TIE_BREAKER 5
#define FIRMWARE_REVISION 6
#define HOST_NAME 7
#define VENDOR_NAME 8
#define ASSIGNED_TUNNEL_ID 9
#define RECEIVE_WINDOW_SIZE 10
#define CHALLENGE 11
#define CAUSE_CODE 12
#define CHALLENGE_RESPONSE 13
#define ASSIGNED_SESSION 14
#define CALL_SERIAL_NUMBER 15
#define MINIMUM_BPS 16
#define MAXIMUM_BPS 17
#define BEARER_TYPE 18
#define FRAMING_TYPE 19
#define CALLED_NUMBER 21
#define CALLING_NUMBER 22
#define SUB_ADDRESS 23
#define TX_CONNECT_SPEED 24
#define PHYSICAL_CHANNEL 25
#define INITIAL_RECEIVED_LCP_CONFREQ 26
#define LAST_SENT_LCP_CONFREQ 27
#define LAST_RECEIVED_LCP_CONFREQ 28
#define PROXY_AUTHEN_TYPE 29
#define PROXY_AUTHEN_NAME 30
#define PROXY_AUTHEN_CHALLENGE 31
#define PROXY_AUTHEN_ID 32
#define PROXY_AUTHEN_RESPONSE 33
#define CALL_STATUS_AVPS 34
#define ACCM 35
#define RANDOM_VECTOR 36
#define PRIVATE_GROUP_ID 37
#define RX_CONNECT_SPEED 38
#define SEQUENCING_REQUIRED 39
#define PPP_DISCONNECT_CAUSE_CODE 46 /* RFC 3145 */
#define EXTENDED_VENDOR_ID 58
#define MESSAGE_DIGEST 59
#define ROUTER_ID 60
#define ASSIGNED_CONTROL_CONN_ID 61
#define PW_CAPABILITY_LIST 62
#define LOCAL_SESSION_ID 63
#define REMOTE_SESSION_ID 64
#define ASSIGNED_COOKIE 65
#define REMOTE_END_ID 66
#define PW_TYPE 68
#define L2_SPECIFIC_SUBLAYER 69
#define DATA_SEQUENCING 70
#define CIRCUIT_STATUS 71
#define PREFERRED_LANGUAGE 72
#define CTL_MSG_AUTH_NONCE 73
#define TX_CONNECT_SPEED_V3 74
#define RX_CONNECT_SPEED_V3 75
#define NUM_AVP_TYPES 76
static const value_string avp_type_vals[] = {
{ CONTROL_MESSAGE, "Control Message" },
{ RESULT_ERROR_CODE, "Result-Error Code" },
{ PROTOCOL_VERSION, "Protocol Version" },
{ FRAMING_CAPABILITIES, "Framing Capabilities" },
{ BEARER_CAPABILITIES, "Bearer Capabilities" },
{ TIE_BREAKER, "Tie Breaker" },
{ FIRMWARE_REVISION, "Firmware Revision" },
{ HOST_NAME, "Host Name" },
{ VENDOR_NAME, "Vendor Name" },
{ ASSIGNED_TUNNEL_ID, "Assigned Tunnel ID" },
{ RECEIVE_WINDOW_SIZE, "Receive Window Size" },
{ CHALLENGE, "Challenge" },
{ CAUSE_CODE, "Cause Code" },
{ CHALLENGE_RESPONSE, "Challenge Response" },
{ ASSIGNED_SESSION, "Assigned Session" },
{ CALL_SERIAL_NUMBER, "Call Serial Number" },
{ MINIMUM_BPS, "Minimum BPS" },
{ MAXIMUM_BPS, "Maximum BPS" },
{ BEARER_TYPE, "Bearer Type" },
{ FRAMING_TYPE, "Framing Type" },
{ CALLED_NUMBER, "Called Number" },
{ CALLING_NUMBER, "Calling Number" },
{ SUB_ADDRESS, "Sub-Address" },
{ TX_CONNECT_SPEED, "Connect Speed" },
{ PHYSICAL_CHANNEL, "Physical Channel" },
{ INITIAL_RECEIVED_LCP_CONFREQ, "Initial Received LCP CONFREQ" },
{ LAST_SENT_LCP_CONFREQ, "Last Sent LCP CONFREQ" },
{ LAST_RECEIVED_LCP_CONFREQ, "Last Received LCP CONFREQ" },
{ PROXY_AUTHEN_TYPE, "Proxy Authen Type" },
{ PROXY_AUTHEN_NAME, "Proxy Authen Name" },
{ PROXY_AUTHEN_CHALLENGE, "Proxy Authen Challenge" },
{ PROXY_AUTHEN_ID, "Proxy Authen ID" },
{ PROXY_AUTHEN_RESPONSE, "Proxy Authen Response" },
{ CALL_STATUS_AVPS, "Call status AVPs" },
{ ACCM, "ACCM" },
{ RANDOM_VECTOR, "Random Vector" },
{ PRIVATE_GROUP_ID, "Private group ID" },
{ RX_CONNECT_SPEED, "RxConnect Speed" },
{ SEQUENCING_REQUIRED, "Sequencing Required" },
{ PPP_DISCONNECT_CAUSE_CODE, "PPP Disconnect Cause Code" },
{ EXTENDED_VENDOR_ID, "Extended Vendor ID" },
{ MESSAGE_DIGEST, "Message Digest" },
{ ROUTER_ID, "Router ID" },
{ ASSIGNED_CONTROL_CONN_ID, "Assigned Control Connection ID" },
{ PW_CAPABILITY_LIST, "Pseudowire Capability List" },
{ LOCAL_SESSION_ID, "Local Session ID" },
{ REMOTE_SESSION_ID, "Remote Session ID" },
{ 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 }
};
/*
* These are SMI Network Management Private Enterprise Codes for
* organizations; see
*
* http://www.iana.org/assignments/enterprise-numbers
*
* for a list.
*/
#define VENDOR_IETF 0
#define VENDOR_ACC 5
#define VENDOR_CISCO 9
#define VENDOR_SHIVA 166
#define VENDOR_LIVINGSTON 307
#define VENDOR_3COM 429
#define VENDOR_ASCEND 529
#define VENDOR_BAY 1584
#define VENDOR_REDBACK 2352
#define VENDOR_JUNIPER 2636
#define VENDOR_COSINE 3085
#define VENDOR_UNISPHERE 4874
static const value_string avp_vendor_id_vals[] =
{{VENDOR_IETF,"IETF"},
{VENDOR_ACC,"ACC"},
{VENDOR_CISCO,"Cisco"},
{VENDOR_SHIVA,"Shiva"},
{VENDOR_LIVINGSTON,"Livingston"},
{VENDOR_3COM,"3Com"},
{VENDOR_ASCEND,"Ascend"},
{VENDOR_BAY,"Bay Networks"},
{VENDOR_REDBACK,"Redback"},
{VENDOR_JUNIPER,"Juniper Networks"},
{VENDOR_COSINE,"CoSine Communications"},
{VENDOR_UNISPHERE,"Unisphere Networks"},
{0,NULL}};
#define CISCO_ASSIGNED_CONNECTION_ID 1
#define CISCO_PW_CAPABILITY_LIST 2
#define CISCO_UNKNOWN_10 10
static const value_string cisco_avp_type_vals[] = {
{ CISCO_ASSIGNED_CONNECTION_ID, "Assigned Connection ID" },
{ CISCO_PW_CAPABILITY_LIST, "Pseudowire Capabilities List" },
{ CISCO_UNKNOWN_10, "Cisco Unknown 10" },
{ 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 gchar textbuffer[200];
static dissector_handle_t ppp_hdlc_handle;
static dissector_handle_t ppp_lcp_options_handle;
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;
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 { /* Vendor-Specific AVP */
tf = proto_tree_add_text(l2tp_tree, tvb, index,
avp_len, "Vendor %s:%s AVP",
val_to_str(avp_vendor_id, avp_vendor_id_vals, "Unknown (%u)"),
val_to_str(avp_type, cisco_avp_type_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 < 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_IETF) {
proto_tree_add_uint(l2tp_avp_tree, hf_l2tp_cisco_avp_type,
tvb, index, 2, avp_type);
/*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. */
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:
while (avp_len > 0) {
int pw_type = tvb_get_ntohs(tvb, index);
proto_tree_add_text(l2tp_avp_tree, tvb, index,
2, "\t PW Type: (%u) %s",
pw_type,
(pw_type < NUM_PW_TYPES) ?
pw_types_vals[pw_type].strptr : "Unknown");
index += 2;
avp_len -= 2;
}
break;
default:
proto_tree_add_text(l2tp_avp_tree, tvb, index,
avp_len, "Vendor-Specific AVP");
break;
}
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: %s",
val_to_str(result_code, result_code_stopccn_vals, "Unknown (%u)"));
}
else {
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
"Result code: %s",
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: %s",
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", 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;
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:
while (avp_len > 0) {
int pw_type = tvb_get_ntohs(tvb, index);
proto_tree_add_text(l2tp_avp_tree, tvb, index,
2, "\t 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_bytes_to_str(tvb, index, avp_len));
break;
case PW_TYPE:
proto_tree_add_text(l2tp_avp_tree, tvb, index, 2,
"Pseudowire Type: %s",
val_to_str(tvb_get_ntohs(tvb, index),
pw_types_vals, "Unknown (%u)"));
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", avp_len,
tvb_get_ptr(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;
}
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;
tvbuff_t *next_tvb;
/* Get Session ID */
sid = tvb_get_ntohl(tvb, index);
index += 4;
if (check_col(pinfo->cinfo, COL_INFO)) {
sprintf(textbuffer,"%s (session id=%d)",
data_msg, sid);
col_add_fstr(pinfo->cinfo,COL_INFO,textbuffer);
}
if (tree) {
proto_tree_add_item(l2tp_tree, hf_l2tp_sid, tvb, index-4, 4, FALSE);
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;
}
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;
control = tvb_get_ntohs(tvb, index);
index += 2; /* skip ahead */
index += 2; /* Skip the reserved */
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 - version 3",
data_msg);
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_uint(ctrl_tree, hf_l2tp_version, tvb, 0, 2, control);
}
process_l2tpv3_data(tvb, pinfo, tree, l2tp_tree, l2tp_item, &index);
return;
}
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;
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, 4, 2,
"Packet Type: %s - version 3",
data_msg);
}
process_l2tpv3_data(tvb, pinfo, tree, l2tp_tree, l2tp_item, &index);
return;
}
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 */
sprintf(textbuffer,"%s - ZLB (tunnel id=%d)",
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;
sprintf(textbuffer,"%s - %s (tunnel id=%d)",
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!
*/
sprintf(textbuffer,"%s (tunnel id=%d)",
control_msg , ccid);
}
}
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+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);
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 Tunnel 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, 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);
}
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;
}
static void
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;
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);
control = tvb_get_ntohs(tvb, 0);
if (L2TP_VERSION(control) != 2) {
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, COL_INFO, "L2TP Version %u", L2TP_VERSION(control) );
}
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;
}
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 */
sprintf(textbuffer,"%s - ZLB (tunnel id=%d, session id=%d)",
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));
sprintf(textbuffer,"%s - %s (tunnel id=%d, session id=%d)",
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!
*/
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);
}
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;
}
process_control_avps(tvb, pinfo, l2tp_tree, index, length);
return;
}
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)) /* 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);
col_add_fstr(pinfo->cinfo, COL_INFO, "L2TP Version 3");
}
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(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 }},
{ &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_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_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_udp_handle;
dissector_handle_t l2tp_ip_handle;
l2tp_udp_handle = 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_PROTOCOL_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");
}
- Follow-Ups:
- Re: [Ethereal-dev] Submitting support for decode of L2TP version 3
- From: Guy Harris
- Re: [Ethereal-dev] Submitting support for decode of L2TP version 3
- Prev by Date: Re: [Ethereal-dev] 0.10.8 soon?( Mate)
- Next by Date: [Ethereal-dev] Prescan packets
- Previous by thread: [Ethereal-dev] Problems in the H.450 dissector when it calls H.225 routines.
- Next by thread: Re: [Ethereal-dev] Submitting support for decode of L2TP version 3
- Index(es):