1*b636d99dSDavid van Moolenbroek /*
2*b636d99dSDavid van Moolenbroek * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
3*b636d99dSDavid van Moolenbroek * The Regents of the University of California. All rights reserved.
4*b636d99dSDavid van Moolenbroek *
5*b636d99dSDavid van Moolenbroek * Redistribution and use in source and binary forms, with or without
6*b636d99dSDavid van Moolenbroek * modification, are permitted provided that: (1) source code distributions
7*b636d99dSDavid van Moolenbroek * retain the above copyright notice and this paragraph in its entirety, (2)
8*b636d99dSDavid van Moolenbroek * distributions including binary code include the above copyright notice and
9*b636d99dSDavid van Moolenbroek * this paragraph in its entirety in the documentation or other materials
10*b636d99dSDavid van Moolenbroek * provided with the distribution, and (3) all advertising materials mentioning
11*b636d99dSDavid van Moolenbroek * features or use of this software display the following acknowledgement:
12*b636d99dSDavid van Moolenbroek * ``This product includes software developed by the University of California,
13*b636d99dSDavid van Moolenbroek * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14*b636d99dSDavid van Moolenbroek * the University nor the names of its contributors may be used to endorse
15*b636d99dSDavid van Moolenbroek * or promote products derived from this software without specific prior
16*b636d99dSDavid van Moolenbroek * written permission.
17*b636d99dSDavid van Moolenbroek * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18*b636d99dSDavid van Moolenbroek * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19*b636d99dSDavid van Moolenbroek * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20*b636d99dSDavid van Moolenbroek *
21*b636d99dSDavid van Moolenbroek * L2TP support contributed by Motonori Shindo (mshindo@mshindo.net)
22*b636d99dSDavid van Moolenbroek */
23*b636d99dSDavid van Moolenbroek
24*b636d99dSDavid van Moolenbroek #include <sys/cdefs.h>
25*b636d99dSDavid van Moolenbroek #ifndef lint
26*b636d99dSDavid van Moolenbroek __RCSID("$NetBSD: print-l2tp.c,v 1.5 2014/11/20 03:05:03 christos Exp $");
27*b636d99dSDavid van Moolenbroek #endif
28*b636d99dSDavid van Moolenbroek
29*b636d99dSDavid van Moolenbroek #define NETDISSECT_REWORKED
30*b636d99dSDavid van Moolenbroek #ifdef HAVE_CONFIG_H
31*b636d99dSDavid van Moolenbroek #include "config.h"
32*b636d99dSDavid van Moolenbroek #endif
33*b636d99dSDavid van Moolenbroek
34*b636d99dSDavid van Moolenbroek #include <tcpdump-stdinc.h>
35*b636d99dSDavid van Moolenbroek
36*b636d99dSDavid van Moolenbroek #include "interface.h"
37*b636d99dSDavid van Moolenbroek #include "extract.h"
38*b636d99dSDavid van Moolenbroek
39*b636d99dSDavid van Moolenbroek #define L2TP_FLAG_TYPE 0x8000 /* Type (0=Data, 1=Control) */
40*b636d99dSDavid van Moolenbroek #define L2TP_FLAG_LENGTH 0x4000 /* Length */
41*b636d99dSDavid van Moolenbroek #define L2TP_FLAG_SEQUENCE 0x0800 /* Sequence */
42*b636d99dSDavid van Moolenbroek #define L2TP_FLAG_OFFSET 0x0200 /* Offset */
43*b636d99dSDavid van Moolenbroek #define L2TP_FLAG_PRIORITY 0x0100 /* Priority */
44*b636d99dSDavid van Moolenbroek
45*b636d99dSDavid van Moolenbroek #define L2TP_VERSION_MASK 0x000f /* Version Mask */
46*b636d99dSDavid van Moolenbroek #define L2TP_VERSION_L2F 0x0001 /* L2F */
47*b636d99dSDavid van Moolenbroek #define L2TP_VERSION_L2TP 0x0002 /* L2TP */
48*b636d99dSDavid van Moolenbroek
49*b636d99dSDavid van Moolenbroek #define L2TP_AVP_HDR_FLAG_MANDATORY 0x8000 /* Mandatory Flag */
50*b636d99dSDavid van Moolenbroek #define L2TP_AVP_HDR_FLAG_HIDDEN 0x4000 /* Hidden Flag */
51*b636d99dSDavid van Moolenbroek #define L2TP_AVP_HDR_LEN_MASK 0x03ff /* Length Mask */
52*b636d99dSDavid van Moolenbroek
53*b636d99dSDavid van Moolenbroek #define L2TP_FRAMING_CAP_SYNC_MASK 0x00000001 /* Synchronous */
54*b636d99dSDavid van Moolenbroek #define L2TP_FRAMING_CAP_ASYNC_MASK 0x00000002 /* Asynchronous */
55*b636d99dSDavid van Moolenbroek
56*b636d99dSDavid van Moolenbroek #define L2TP_FRAMING_TYPE_SYNC_MASK 0x00000001 /* Synchronous */
57*b636d99dSDavid van Moolenbroek #define L2TP_FRAMING_TYPE_ASYNC_MASK 0x00000002 /* Asynchronous */
58*b636d99dSDavid van Moolenbroek
59*b636d99dSDavid van Moolenbroek #define L2TP_BEARER_CAP_DIGITAL_MASK 0x00000001 /* Digital */
60*b636d99dSDavid van Moolenbroek #define L2TP_BEARER_CAP_ANALOG_MASK 0x00000002 /* Analog */
61*b636d99dSDavid van Moolenbroek
62*b636d99dSDavid van Moolenbroek #define L2TP_BEARER_TYPE_DIGITAL_MASK 0x00000001 /* Digital */
63*b636d99dSDavid van Moolenbroek #define L2TP_BEARER_TYPE_ANALOG_MASK 0x00000002 /* Analog */
64*b636d99dSDavid van Moolenbroek
65*b636d99dSDavid van Moolenbroek /* Authen Type */
66*b636d99dSDavid van Moolenbroek #define L2TP_AUTHEN_TYPE_RESERVED 0x0000 /* Reserved */
67*b636d99dSDavid van Moolenbroek #define L2TP_AUTHEN_TYPE_TEXTUAL 0x0001 /* Textual username/password exchange */
68*b636d99dSDavid van Moolenbroek #define L2TP_AUTHEN_TYPE_CHAP 0x0002 /* PPP CHAP */
69*b636d99dSDavid van Moolenbroek #define L2TP_AUTHEN_TYPE_PAP 0x0003 /* PPP PAP */
70*b636d99dSDavid van Moolenbroek #define L2TP_AUTHEN_TYPE_NO_AUTH 0x0004 /* No Authentication */
71*b636d99dSDavid van Moolenbroek #define L2TP_AUTHEN_TYPE_MSCHAPv1 0x0005 /* MSCHAPv1 */
72*b636d99dSDavid van Moolenbroek
73*b636d99dSDavid van Moolenbroek #define L2TP_PROXY_AUTH_ID_MASK 0x00ff
74*b636d99dSDavid van Moolenbroek
75*b636d99dSDavid van Moolenbroek static const char tstr[] = " [|l2tp]";
76*b636d99dSDavid van Moolenbroek
77*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_SCCRQ 1 /* Start-Control-Connection-Request */
78*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_SCCRP 2 /* Start-Control-Connection-Reply */
79*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_SCCCN 3 /* Start-Control-Connection-Connected */
80*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_STOPCCN 4 /* Stop-Control-Connection-Notification */
81*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_HELLO 6 /* Hello */
82*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_OCRQ 7 /* Outgoing-Call-Request */
83*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_OCRP 8 /* Outgoing-Call-Reply */
84*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_OCCN 9 /* Outgoing-Call-Connected */
85*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_ICRQ 10 /* Incoming-Call-Request */
86*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_ICRP 11 /* Incoming-Call-Reply */
87*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_ICCN 12 /* Incoming-Call-Connected */
88*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_CDN 14 /* Call-Disconnect-Notify */
89*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_WEN 15 /* WAN-Error-Notify */
90*b636d99dSDavid van Moolenbroek #define L2TP_MSGTYPE_SLI 16 /* Set-Link-Info */
91*b636d99dSDavid van Moolenbroek
92*b636d99dSDavid van Moolenbroek static const struct tok l2tp_msgtype2str[] = {
93*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_SCCRQ, "SCCRQ" },
94*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_SCCRP, "SCCRP" },
95*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_SCCCN, "SCCCN" },
96*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_STOPCCN, "StopCCN" },
97*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_HELLO, "HELLO" },
98*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_OCRQ, "OCRQ" },
99*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_OCRP, "OCRP" },
100*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_OCCN, "OCCN" },
101*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_ICRQ, "ICRQ" },
102*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_ICRP, "ICRP" },
103*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_ICCN, "ICCN" },
104*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_CDN, "CDN" },
105*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_WEN, "WEN" },
106*b636d99dSDavid van Moolenbroek { L2TP_MSGTYPE_SLI, "SLI" },
107*b636d99dSDavid van Moolenbroek { 0, NULL }
108*b636d99dSDavid van Moolenbroek };
109*b636d99dSDavid van Moolenbroek
110*b636d99dSDavid van Moolenbroek #define L2TP_AVP_MSGTYPE 0 /* Message Type */
111*b636d99dSDavid van Moolenbroek #define L2TP_AVP_RESULT_CODE 1 /* Result Code */
112*b636d99dSDavid van Moolenbroek #define L2TP_AVP_PROTO_VER 2 /* Protocol Version */
113*b636d99dSDavid van Moolenbroek #define L2TP_AVP_FRAMING_CAP 3 /* Framing Capabilities */
114*b636d99dSDavid van Moolenbroek #define L2TP_AVP_BEARER_CAP 4 /* Bearer Capabilities */
115*b636d99dSDavid van Moolenbroek #define L2TP_AVP_TIE_BREAKER 5 /* Tie Breaker */
116*b636d99dSDavid van Moolenbroek #define L2TP_AVP_FIRM_VER 6 /* Firmware Revision */
117*b636d99dSDavid van Moolenbroek #define L2TP_AVP_HOST_NAME 7 /* Host Name */
118*b636d99dSDavid van Moolenbroek #define L2TP_AVP_VENDOR_NAME 8 /* Vendor Name */
119*b636d99dSDavid van Moolenbroek #define L2TP_AVP_ASSND_TUN_ID 9 /* Assigned Tunnel ID */
120*b636d99dSDavid van Moolenbroek #define L2TP_AVP_RECV_WIN_SIZE 10 /* Receive Window Size */
121*b636d99dSDavid van Moolenbroek #define L2TP_AVP_CHALLENGE 11 /* Challenge */
122*b636d99dSDavid van Moolenbroek #define L2TP_AVP_Q931_CC 12 /* Q.931 Cause Code */
123*b636d99dSDavid van Moolenbroek #define L2TP_AVP_CHALLENGE_RESP 13 /* Challenge Response */
124*b636d99dSDavid van Moolenbroek #define L2TP_AVP_ASSND_SESS_ID 14 /* Assigned Session ID */
125*b636d99dSDavid van Moolenbroek #define L2TP_AVP_CALL_SER_NUM 15 /* Call Serial Number */
126*b636d99dSDavid van Moolenbroek #define L2TP_AVP_MINIMUM_BPS 16 /* Minimum BPS */
127*b636d99dSDavid van Moolenbroek #define L2TP_AVP_MAXIMUM_BPS 17 /* Maximum BPS */
128*b636d99dSDavid van Moolenbroek #define L2TP_AVP_BEARER_TYPE 18 /* Bearer Type */
129*b636d99dSDavid van Moolenbroek #define L2TP_AVP_FRAMING_TYPE 19 /* Framing Type */
130*b636d99dSDavid van Moolenbroek #define L2TP_AVP_PACKET_PROC_DELAY 20 /* Packet Processing Delay (OBSOLETE) */
131*b636d99dSDavid van Moolenbroek #define L2TP_AVP_CALLED_NUMBER 21 /* Called Number */
132*b636d99dSDavid van Moolenbroek #define L2TP_AVP_CALLING_NUMBER 22 /* Calling Number */
133*b636d99dSDavid van Moolenbroek #define L2TP_AVP_SUB_ADDRESS 23 /* Sub-Address */
134*b636d99dSDavid van Moolenbroek #define L2TP_AVP_TX_CONN_SPEED 24 /* (Tx) Connect Speed */
135*b636d99dSDavid van Moolenbroek #define L2TP_AVP_PHY_CHANNEL_ID 25 /* Physical Channel ID */
136*b636d99dSDavid van Moolenbroek #define L2TP_AVP_INI_RECV_LCP 26 /* Initial Received LCP CONFREQ */
137*b636d99dSDavid van Moolenbroek #define L2TP_AVP_LAST_SENT_LCP 27 /* Last Sent LCP CONFREQ */
138*b636d99dSDavid van Moolenbroek #define L2TP_AVP_LAST_RECV_LCP 28 /* Last Received LCP CONFREQ */
139*b636d99dSDavid van Moolenbroek #define L2TP_AVP_PROXY_AUTH_TYPE 29 /* Proxy Authen Type */
140*b636d99dSDavid van Moolenbroek #define L2TP_AVP_PROXY_AUTH_NAME 30 /* Proxy Authen Name */
141*b636d99dSDavid van Moolenbroek #define L2TP_AVP_PROXY_AUTH_CHAL 31 /* Proxy Authen Challenge */
142*b636d99dSDavid van Moolenbroek #define L2TP_AVP_PROXY_AUTH_ID 32 /* Proxy Authen ID */
143*b636d99dSDavid van Moolenbroek #define L2TP_AVP_PROXY_AUTH_RESP 33 /* Proxy Authen Response */
144*b636d99dSDavid van Moolenbroek #define L2TP_AVP_CALL_ERRORS 34 /* Call Errors */
145*b636d99dSDavid van Moolenbroek #define L2TP_AVP_ACCM 35 /* ACCM */
146*b636d99dSDavid van Moolenbroek #define L2TP_AVP_RANDOM_VECTOR 36 /* Random Vector */
147*b636d99dSDavid van Moolenbroek #define L2TP_AVP_PRIVATE_GRP_ID 37 /* Private Group ID */
148*b636d99dSDavid van Moolenbroek #define L2TP_AVP_RX_CONN_SPEED 38 /* (Rx) Connect Speed */
149*b636d99dSDavid van Moolenbroek #define L2TP_AVP_SEQ_REQUIRED 39 /* Sequencing Required */
150*b636d99dSDavid van Moolenbroek #define L2TP_AVP_PPP_DISCON_CC 46 /* PPP Disconnect Cause Code */
151*b636d99dSDavid van Moolenbroek
152*b636d99dSDavid van Moolenbroek static const struct tok l2tp_avp2str[] = {
153*b636d99dSDavid van Moolenbroek { L2TP_AVP_MSGTYPE, "MSGTYPE" },
154*b636d99dSDavid van Moolenbroek { L2TP_AVP_RESULT_CODE, "RESULT_CODE" },
155*b636d99dSDavid van Moolenbroek { L2TP_AVP_PROTO_VER, "PROTO_VER" },
156*b636d99dSDavid van Moolenbroek { L2TP_AVP_FRAMING_CAP, "FRAMING_CAP" },
157*b636d99dSDavid van Moolenbroek { L2TP_AVP_BEARER_CAP, "BEARER_CAP" },
158*b636d99dSDavid van Moolenbroek { L2TP_AVP_TIE_BREAKER, "TIE_BREAKER" },
159*b636d99dSDavid van Moolenbroek { L2TP_AVP_FIRM_VER, "FIRM_VER" },
160*b636d99dSDavid van Moolenbroek { L2TP_AVP_HOST_NAME, "HOST_NAME" },
161*b636d99dSDavid van Moolenbroek { L2TP_AVP_VENDOR_NAME, "VENDOR_NAME" },
162*b636d99dSDavid van Moolenbroek { L2TP_AVP_ASSND_TUN_ID, "ASSND_TUN_ID" },
163*b636d99dSDavid van Moolenbroek { L2TP_AVP_RECV_WIN_SIZE, "RECV_WIN_SIZE" },
164*b636d99dSDavid van Moolenbroek { L2TP_AVP_CHALLENGE, "CHALLENGE" },
165*b636d99dSDavid van Moolenbroek { L2TP_AVP_Q931_CC, "Q931_CC", },
166*b636d99dSDavid van Moolenbroek { L2TP_AVP_CHALLENGE_RESP, "CHALLENGE_RESP" },
167*b636d99dSDavid van Moolenbroek { L2TP_AVP_ASSND_SESS_ID, "ASSND_SESS_ID" },
168*b636d99dSDavid van Moolenbroek { L2TP_AVP_CALL_SER_NUM, "CALL_SER_NUM" },
169*b636d99dSDavid van Moolenbroek { L2TP_AVP_MINIMUM_BPS, "MINIMUM_BPS" },
170*b636d99dSDavid van Moolenbroek { L2TP_AVP_MAXIMUM_BPS, "MAXIMUM_BPS" },
171*b636d99dSDavid van Moolenbroek { L2TP_AVP_BEARER_TYPE, "BEARER_TYPE" },
172*b636d99dSDavid van Moolenbroek { L2TP_AVP_FRAMING_TYPE, "FRAMING_TYPE" },
173*b636d99dSDavid van Moolenbroek { L2TP_AVP_PACKET_PROC_DELAY, "PACKET_PROC_DELAY" },
174*b636d99dSDavid van Moolenbroek { L2TP_AVP_CALLED_NUMBER, "CALLED_NUMBER" },
175*b636d99dSDavid van Moolenbroek { L2TP_AVP_CALLING_NUMBER, "CALLING_NUMBER" },
176*b636d99dSDavid van Moolenbroek { L2TP_AVP_SUB_ADDRESS, "SUB_ADDRESS" },
177*b636d99dSDavid van Moolenbroek { L2TP_AVP_TX_CONN_SPEED, "TX_CONN_SPEED" },
178*b636d99dSDavid van Moolenbroek { L2TP_AVP_PHY_CHANNEL_ID, "PHY_CHANNEL_ID" },
179*b636d99dSDavid van Moolenbroek { L2TP_AVP_INI_RECV_LCP, "INI_RECV_LCP" },
180*b636d99dSDavid van Moolenbroek { L2TP_AVP_LAST_SENT_LCP, "LAST_SENT_LCP" },
181*b636d99dSDavid van Moolenbroek { L2TP_AVP_LAST_RECV_LCP, "LAST_RECV_LCP" },
182*b636d99dSDavid van Moolenbroek { L2TP_AVP_PROXY_AUTH_TYPE, "PROXY_AUTH_TYPE" },
183*b636d99dSDavid van Moolenbroek { L2TP_AVP_PROXY_AUTH_NAME, "PROXY_AUTH_NAME" },
184*b636d99dSDavid van Moolenbroek { L2TP_AVP_PROXY_AUTH_CHAL, "PROXY_AUTH_CHAL" },
185*b636d99dSDavid van Moolenbroek { L2TP_AVP_PROXY_AUTH_ID, "PROXY_AUTH_ID" },
186*b636d99dSDavid van Moolenbroek { L2TP_AVP_PROXY_AUTH_RESP, "PROXY_AUTH_RESP" },
187*b636d99dSDavid van Moolenbroek { L2TP_AVP_CALL_ERRORS, "CALL_ERRORS" },
188*b636d99dSDavid van Moolenbroek { L2TP_AVP_ACCM, "ACCM" },
189*b636d99dSDavid van Moolenbroek { L2TP_AVP_RANDOM_VECTOR, "RANDOM_VECTOR" },
190*b636d99dSDavid van Moolenbroek { L2TP_AVP_PRIVATE_GRP_ID, "PRIVATE_GRP_ID" },
191*b636d99dSDavid van Moolenbroek { L2TP_AVP_RX_CONN_SPEED, "RX_CONN_SPEED" },
192*b636d99dSDavid van Moolenbroek { L2TP_AVP_SEQ_REQUIRED, "SEQ_REQUIRED" },
193*b636d99dSDavid van Moolenbroek { L2TP_AVP_PPP_DISCON_CC, "PPP_DISCON_CC" },
194*b636d99dSDavid van Moolenbroek { 0, NULL }
195*b636d99dSDavid van Moolenbroek };
196*b636d99dSDavid van Moolenbroek
197*b636d99dSDavid van Moolenbroek static const struct tok l2tp_authentype2str[] = {
198*b636d99dSDavid van Moolenbroek { L2TP_AUTHEN_TYPE_RESERVED, "Reserved" },
199*b636d99dSDavid van Moolenbroek { L2TP_AUTHEN_TYPE_TEXTUAL, "Textual" },
200*b636d99dSDavid van Moolenbroek { L2TP_AUTHEN_TYPE_CHAP, "CHAP" },
201*b636d99dSDavid van Moolenbroek { L2TP_AUTHEN_TYPE_PAP, "PAP" },
202*b636d99dSDavid van Moolenbroek { L2TP_AUTHEN_TYPE_NO_AUTH, "No Auth" },
203*b636d99dSDavid van Moolenbroek { L2TP_AUTHEN_TYPE_MSCHAPv1, "MS-CHAPv1" },
204*b636d99dSDavid van Moolenbroek { 0, NULL }
205*b636d99dSDavid van Moolenbroek };
206*b636d99dSDavid van Moolenbroek
207*b636d99dSDavid van Moolenbroek #define L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL 0
208*b636d99dSDavid van Moolenbroek #define L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER 1
209*b636d99dSDavid van Moolenbroek #define L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL 2
210*b636d99dSDavid van Moolenbroek
211*b636d99dSDavid van Moolenbroek static const struct tok l2tp_cc_direction2str[] = {
212*b636d99dSDavid van Moolenbroek { L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL, "global error" },
213*b636d99dSDavid van Moolenbroek { L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER, "at peer" },
214*b636d99dSDavid van Moolenbroek { L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL,"at local" },
215*b636d99dSDavid van Moolenbroek { 0, NULL }
216*b636d99dSDavid van Moolenbroek };
217*b636d99dSDavid van Moolenbroek
218*b636d99dSDavid van Moolenbroek #if 0
219*b636d99dSDavid van Moolenbroek static char *l2tp_result_code_StopCCN[] = {
220*b636d99dSDavid van Moolenbroek "Reserved",
221*b636d99dSDavid van Moolenbroek "General request to clear control connection",
222*b636d99dSDavid van Moolenbroek "General error--Error Code indicates the problem",
223*b636d99dSDavid van Moolenbroek "Control channel already exists",
224*b636d99dSDavid van Moolenbroek "Requester is not authorized to establish a control channel",
225*b636d99dSDavid van Moolenbroek "The protocol version of the requester is not supported",
226*b636d99dSDavid van Moolenbroek "Requester is being shut down",
227*b636d99dSDavid van Moolenbroek "Finite State Machine error"
228*b636d99dSDavid van Moolenbroek #define L2TP_MAX_RESULT_CODE_STOPCC_INDEX 8
229*b636d99dSDavid van Moolenbroek };
230*b636d99dSDavid van Moolenbroek #endif
231*b636d99dSDavid van Moolenbroek
232*b636d99dSDavid van Moolenbroek #if 0
233*b636d99dSDavid van Moolenbroek static char *l2tp_result_code_CDN[] = {
234*b636d99dSDavid van Moolenbroek "Reserved",
235*b636d99dSDavid van Moolenbroek "Call disconnected due to loss of carrier",
236*b636d99dSDavid van Moolenbroek "Call disconnected for the reason indicated in error code",
237*b636d99dSDavid van Moolenbroek "Call disconnected for administrative reasons",
238*b636d99dSDavid van Moolenbroek "Call failed due to lack of appropriate facilities being " \
239*b636d99dSDavid van Moolenbroek "available (temporary condition)",
240*b636d99dSDavid van Moolenbroek "Call failed due to lack of appropriate facilities being " \
241*b636d99dSDavid van Moolenbroek "available (permanent condition)",
242*b636d99dSDavid van Moolenbroek "Invalid destination",
243*b636d99dSDavid van Moolenbroek "Call failed due to no carrier detected",
244*b636d99dSDavid van Moolenbroek "Call failed due to detection of a busy signal",
245*b636d99dSDavid van Moolenbroek "Call failed due to lack of a dial tone",
246*b636d99dSDavid van Moolenbroek "Call was not established within time allotted by LAC",
247*b636d99dSDavid van Moolenbroek "Call was connected but no appropriate framing was detected"
248*b636d99dSDavid van Moolenbroek #define L2TP_MAX_RESULT_CODE_CDN_INDEX 12
249*b636d99dSDavid van Moolenbroek };
250*b636d99dSDavid van Moolenbroek #endif
251*b636d99dSDavid van Moolenbroek
252*b636d99dSDavid van Moolenbroek #if 0
253*b636d99dSDavid van Moolenbroek static char *l2tp_error_code_general[] = {
254*b636d99dSDavid van Moolenbroek "No general error",
255*b636d99dSDavid van Moolenbroek "No control connection exists yet for this LAC-LNS pair",
256*b636d99dSDavid van Moolenbroek "Length is wrong",
257*b636d99dSDavid van Moolenbroek "One of the field values was out of range or " \
258*b636d99dSDavid van Moolenbroek "reserved field was non-zero"
259*b636d99dSDavid van Moolenbroek "Insufficient resources to handle this operation now",
260*b636d99dSDavid van Moolenbroek "The Session ID is invalid in this context",
261*b636d99dSDavid van Moolenbroek "A generic vendor-specific error occurred in the LAC",
262*b636d99dSDavid van Moolenbroek "Try another"
263*b636d99dSDavid van Moolenbroek #define L2TP_MAX_ERROR_CODE_GENERAL_INDEX 8
264*b636d99dSDavid van Moolenbroek };
265*b636d99dSDavid van Moolenbroek #endif
266*b636d99dSDavid van Moolenbroek
267*b636d99dSDavid van Moolenbroek /******************************/
268*b636d99dSDavid van Moolenbroek /* generic print out routines */
269*b636d99dSDavid van Moolenbroek /******************************/
270*b636d99dSDavid van Moolenbroek static void
print_string(netdissect_options * ndo,const u_char * dat,u_int length)271*b636d99dSDavid van Moolenbroek print_string(netdissect_options *ndo, const u_char *dat, u_int length)
272*b636d99dSDavid van Moolenbroek {
273*b636d99dSDavid van Moolenbroek u_int i;
274*b636d99dSDavid van Moolenbroek for (i=0; i<length; i++) {
275*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%c", *dat++));
276*b636d99dSDavid van Moolenbroek }
277*b636d99dSDavid van Moolenbroek }
278*b636d99dSDavid van Moolenbroek
279*b636d99dSDavid van Moolenbroek static void
print_octets(netdissect_options * ndo,const u_char * dat,u_int length)280*b636d99dSDavid van Moolenbroek print_octets(netdissect_options *ndo, const u_char *dat, u_int length)
281*b636d99dSDavid van Moolenbroek {
282*b636d99dSDavid van Moolenbroek u_int i;
283*b636d99dSDavid van Moolenbroek for (i=0; i<length; i++) {
284*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%02x", *dat++));
285*b636d99dSDavid van Moolenbroek }
286*b636d99dSDavid van Moolenbroek }
287*b636d99dSDavid van Moolenbroek
288*b636d99dSDavid van Moolenbroek static void
print_16bits_val(netdissect_options * ndo,const uint16_t * dat)289*b636d99dSDavid van Moolenbroek print_16bits_val(netdissect_options *ndo, const uint16_t *dat)
290*b636d99dSDavid van Moolenbroek {
291*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%u", EXTRACT_16BITS(dat)));
292*b636d99dSDavid van Moolenbroek }
293*b636d99dSDavid van Moolenbroek
294*b636d99dSDavid van Moolenbroek static void
print_32bits_val(netdissect_options * ndo,const uint32_t * dat)295*b636d99dSDavid van Moolenbroek print_32bits_val(netdissect_options *ndo, const uint32_t *dat)
296*b636d99dSDavid van Moolenbroek {
297*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%lu", (u_long)EXTRACT_32BITS(dat)));
298*b636d99dSDavid van Moolenbroek }
299*b636d99dSDavid van Moolenbroek
300*b636d99dSDavid van Moolenbroek /***********************************/
301*b636d99dSDavid van Moolenbroek /* AVP-specific print out routines */
302*b636d99dSDavid van Moolenbroek /***********************************/
303*b636d99dSDavid van Moolenbroek static void
l2tp_msgtype_print(netdissect_options * ndo,const u_char * dat)304*b636d99dSDavid van Moolenbroek l2tp_msgtype_print(netdissect_options *ndo, const u_char *dat)
305*b636d99dSDavid van Moolenbroek {
306*b636d99dSDavid van Moolenbroek uint16_t *ptr = (uint16_t*)dat;
307*b636d99dSDavid van Moolenbroek
308*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%s", tok2str(l2tp_msgtype2str, "MSGTYPE-#%u",
309*b636d99dSDavid van Moolenbroek EXTRACT_16BITS(ptr))));
310*b636d99dSDavid van Moolenbroek }
311*b636d99dSDavid van Moolenbroek
312*b636d99dSDavid van Moolenbroek static void
l2tp_result_code_print(netdissect_options * ndo,const u_char * dat,u_int length)313*b636d99dSDavid van Moolenbroek l2tp_result_code_print(netdissect_options *ndo, const u_char *dat, u_int length)
314*b636d99dSDavid van Moolenbroek {
315*b636d99dSDavid van Moolenbroek uint16_t *ptr = (uint16_t *)dat;
316*b636d99dSDavid van Moolenbroek
317*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%u", EXTRACT_16BITS(ptr))); ptr++; /* Result Code */
318*b636d99dSDavid van Moolenbroek if (length > 2) { /* Error Code (opt) */
319*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "/%u", EXTRACT_16BITS(ptr))); ptr++;
320*b636d99dSDavid van Moolenbroek }
321*b636d99dSDavid van Moolenbroek if (length > 4) { /* Error Message (opt) */
322*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " "));
323*b636d99dSDavid van Moolenbroek print_string(ndo, (u_char *)ptr, length - 4);
324*b636d99dSDavid van Moolenbroek }
325*b636d99dSDavid van Moolenbroek }
326*b636d99dSDavid van Moolenbroek
327*b636d99dSDavid van Moolenbroek static void
l2tp_proto_ver_print(netdissect_options * ndo,const uint16_t * dat)328*b636d99dSDavid van Moolenbroek l2tp_proto_ver_print(netdissect_options *ndo, const uint16_t *dat)
329*b636d99dSDavid van Moolenbroek {
330*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%u.%u", (EXTRACT_16BITS(dat) >> 8),
331*b636d99dSDavid van Moolenbroek (EXTRACT_16BITS(dat) & 0xff)));
332*b636d99dSDavid van Moolenbroek }
333*b636d99dSDavid van Moolenbroek
334*b636d99dSDavid van Moolenbroek static void
l2tp_framing_cap_print(netdissect_options * ndo,const u_char * dat)335*b636d99dSDavid van Moolenbroek l2tp_framing_cap_print(netdissect_options *ndo, const u_char *dat)
336*b636d99dSDavid van Moolenbroek {
337*b636d99dSDavid van Moolenbroek uint32_t *ptr = (uint32_t *)dat;
338*b636d99dSDavid van Moolenbroek
339*b636d99dSDavid van Moolenbroek if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_CAP_ASYNC_MASK) {
340*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "A"));
341*b636d99dSDavid van Moolenbroek }
342*b636d99dSDavid van Moolenbroek if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_CAP_SYNC_MASK) {
343*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "S"));
344*b636d99dSDavid van Moolenbroek }
345*b636d99dSDavid van Moolenbroek }
346*b636d99dSDavid van Moolenbroek
347*b636d99dSDavid van Moolenbroek static void
l2tp_bearer_cap_print(netdissect_options * ndo,const u_char * dat)348*b636d99dSDavid van Moolenbroek l2tp_bearer_cap_print(netdissect_options *ndo, const u_char *dat)
349*b636d99dSDavid van Moolenbroek {
350*b636d99dSDavid van Moolenbroek uint32_t *ptr = (uint32_t *)dat;
351*b636d99dSDavid van Moolenbroek
352*b636d99dSDavid van Moolenbroek if (EXTRACT_32BITS(ptr) & L2TP_BEARER_CAP_ANALOG_MASK) {
353*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "A"));
354*b636d99dSDavid van Moolenbroek }
355*b636d99dSDavid van Moolenbroek if (EXTRACT_32BITS(ptr) & L2TP_BEARER_CAP_DIGITAL_MASK) {
356*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "D"));
357*b636d99dSDavid van Moolenbroek }
358*b636d99dSDavid van Moolenbroek }
359*b636d99dSDavid van Moolenbroek
360*b636d99dSDavid van Moolenbroek static void
l2tp_q931_cc_print(netdissect_options * ndo,const u_char * dat,u_int length)361*b636d99dSDavid van Moolenbroek l2tp_q931_cc_print(netdissect_options *ndo, const u_char *dat, u_int length)
362*b636d99dSDavid van Moolenbroek {
363*b636d99dSDavid van Moolenbroek print_16bits_val(ndo, (uint16_t *)dat);
364*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, ", %02x", dat[2]));
365*b636d99dSDavid van Moolenbroek if (length > 3) {
366*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " "));
367*b636d99dSDavid van Moolenbroek print_string(ndo, dat+3, length-3);
368*b636d99dSDavid van Moolenbroek }
369*b636d99dSDavid van Moolenbroek }
370*b636d99dSDavid van Moolenbroek
371*b636d99dSDavid van Moolenbroek static void
l2tp_bearer_type_print(netdissect_options * ndo,const u_char * dat)372*b636d99dSDavid van Moolenbroek l2tp_bearer_type_print(netdissect_options *ndo, const u_char *dat)
373*b636d99dSDavid van Moolenbroek {
374*b636d99dSDavid van Moolenbroek uint32_t *ptr = (uint32_t *)dat;
375*b636d99dSDavid van Moolenbroek
376*b636d99dSDavid van Moolenbroek if (EXTRACT_32BITS(ptr) & L2TP_BEARER_TYPE_ANALOG_MASK) {
377*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "A"));
378*b636d99dSDavid van Moolenbroek }
379*b636d99dSDavid van Moolenbroek if (EXTRACT_32BITS(ptr) & L2TP_BEARER_TYPE_DIGITAL_MASK) {
380*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "D"));
381*b636d99dSDavid van Moolenbroek }
382*b636d99dSDavid van Moolenbroek }
383*b636d99dSDavid van Moolenbroek
384*b636d99dSDavid van Moolenbroek static void
l2tp_framing_type_print(netdissect_options * ndo,const u_char * dat)385*b636d99dSDavid van Moolenbroek l2tp_framing_type_print(netdissect_options *ndo, const u_char *dat)
386*b636d99dSDavid van Moolenbroek {
387*b636d99dSDavid van Moolenbroek uint32_t *ptr = (uint32_t *)dat;
388*b636d99dSDavid van Moolenbroek
389*b636d99dSDavid van Moolenbroek if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_TYPE_ASYNC_MASK) {
390*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "A"));
391*b636d99dSDavid van Moolenbroek }
392*b636d99dSDavid van Moolenbroek if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_TYPE_SYNC_MASK) {
393*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "S"));
394*b636d99dSDavid van Moolenbroek }
395*b636d99dSDavid van Moolenbroek }
396*b636d99dSDavid van Moolenbroek
397*b636d99dSDavid van Moolenbroek static void
l2tp_packet_proc_delay_print(netdissect_options * ndo)398*b636d99dSDavid van Moolenbroek l2tp_packet_proc_delay_print(netdissect_options *ndo)
399*b636d99dSDavid van Moolenbroek {
400*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "obsolete"));
401*b636d99dSDavid van Moolenbroek }
402*b636d99dSDavid van Moolenbroek
403*b636d99dSDavid van Moolenbroek static void
l2tp_proxy_auth_type_print(netdissect_options * ndo,const u_char * dat)404*b636d99dSDavid van Moolenbroek l2tp_proxy_auth_type_print(netdissect_options *ndo, const u_char *dat)
405*b636d99dSDavid van Moolenbroek {
406*b636d99dSDavid van Moolenbroek uint16_t *ptr = (uint16_t *)dat;
407*b636d99dSDavid van Moolenbroek
408*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%s", tok2str(l2tp_authentype2str,
409*b636d99dSDavid van Moolenbroek "AuthType-#%u", EXTRACT_16BITS(ptr))));
410*b636d99dSDavid van Moolenbroek }
411*b636d99dSDavid van Moolenbroek
412*b636d99dSDavid van Moolenbroek static void
l2tp_proxy_auth_id_print(netdissect_options * ndo,const u_char * dat)413*b636d99dSDavid van Moolenbroek l2tp_proxy_auth_id_print(netdissect_options *ndo, const u_char *dat)
414*b636d99dSDavid van Moolenbroek {
415*b636d99dSDavid van Moolenbroek uint16_t *ptr = (uint16_t *)dat;
416*b636d99dSDavid van Moolenbroek
417*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%u", EXTRACT_16BITS(ptr) & L2TP_PROXY_AUTH_ID_MASK));
418*b636d99dSDavid van Moolenbroek }
419*b636d99dSDavid van Moolenbroek
420*b636d99dSDavid van Moolenbroek static void
l2tp_call_errors_print(netdissect_options * ndo,const u_char * dat)421*b636d99dSDavid van Moolenbroek l2tp_call_errors_print(netdissect_options *ndo, const u_char *dat)
422*b636d99dSDavid van Moolenbroek {
423*b636d99dSDavid van Moolenbroek uint16_t *ptr = (uint16_t *)dat;
424*b636d99dSDavid van Moolenbroek uint16_t val_h, val_l;
425*b636d99dSDavid van Moolenbroek
426*b636d99dSDavid van Moolenbroek ptr++; /* skip "Reserved" */
427*b636d99dSDavid van Moolenbroek
428*b636d99dSDavid van Moolenbroek val_h = EXTRACT_16BITS(ptr); ptr++;
429*b636d99dSDavid van Moolenbroek val_l = EXTRACT_16BITS(ptr); ptr++;
430*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "CRCErr=%u ", (val_h<<16) + val_l));
431*b636d99dSDavid van Moolenbroek
432*b636d99dSDavid van Moolenbroek val_h = EXTRACT_16BITS(ptr); ptr++;
433*b636d99dSDavid van Moolenbroek val_l = EXTRACT_16BITS(ptr); ptr++;
434*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "FrameErr=%u ", (val_h<<16) + val_l));
435*b636d99dSDavid van Moolenbroek
436*b636d99dSDavid van Moolenbroek val_h = EXTRACT_16BITS(ptr); ptr++;
437*b636d99dSDavid van Moolenbroek val_l = EXTRACT_16BITS(ptr); ptr++;
438*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "HardOver=%u ", (val_h<<16) + val_l));
439*b636d99dSDavid van Moolenbroek
440*b636d99dSDavid van Moolenbroek val_h = EXTRACT_16BITS(ptr); ptr++;
441*b636d99dSDavid van Moolenbroek val_l = EXTRACT_16BITS(ptr); ptr++;
442*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "BufOver=%u ", (val_h<<16) + val_l));
443*b636d99dSDavid van Moolenbroek
444*b636d99dSDavid van Moolenbroek val_h = EXTRACT_16BITS(ptr); ptr++;
445*b636d99dSDavid van Moolenbroek val_l = EXTRACT_16BITS(ptr); ptr++;
446*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "Timeout=%u ", (val_h<<16) + val_l));
447*b636d99dSDavid van Moolenbroek
448*b636d99dSDavid van Moolenbroek val_h = EXTRACT_16BITS(ptr); ptr++;
449*b636d99dSDavid van Moolenbroek val_l = EXTRACT_16BITS(ptr); ptr++;
450*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "AlignErr=%u ", (val_h<<16) + val_l));
451*b636d99dSDavid van Moolenbroek }
452*b636d99dSDavid van Moolenbroek
453*b636d99dSDavid van Moolenbroek static void
l2tp_accm_print(netdissect_options * ndo,const u_char * dat)454*b636d99dSDavid van Moolenbroek l2tp_accm_print(netdissect_options *ndo, const u_char *dat)
455*b636d99dSDavid van Moolenbroek {
456*b636d99dSDavid van Moolenbroek uint16_t *ptr = (uint16_t *)dat;
457*b636d99dSDavid van Moolenbroek uint16_t val_h, val_l;
458*b636d99dSDavid van Moolenbroek
459*b636d99dSDavid van Moolenbroek ptr++; /* skip "Reserved" */
460*b636d99dSDavid van Moolenbroek
461*b636d99dSDavid van Moolenbroek val_h = EXTRACT_16BITS(ptr); ptr++;
462*b636d99dSDavid van Moolenbroek val_l = EXTRACT_16BITS(ptr); ptr++;
463*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "send=%08x ", (val_h<<16) + val_l));
464*b636d99dSDavid van Moolenbroek
465*b636d99dSDavid van Moolenbroek val_h = EXTRACT_16BITS(ptr); ptr++;
466*b636d99dSDavid van Moolenbroek val_l = EXTRACT_16BITS(ptr); ptr++;
467*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "recv=%08x ", (val_h<<16) + val_l));
468*b636d99dSDavid van Moolenbroek }
469*b636d99dSDavid van Moolenbroek
470*b636d99dSDavid van Moolenbroek static void
l2tp_ppp_discon_cc_print(netdissect_options * ndo,const u_char * dat,u_int length)471*b636d99dSDavid van Moolenbroek l2tp_ppp_discon_cc_print(netdissect_options *ndo, const u_char *dat, u_int length)
472*b636d99dSDavid van Moolenbroek {
473*b636d99dSDavid van Moolenbroek uint16_t *ptr = (uint16_t *)dat;
474*b636d99dSDavid van Moolenbroek
475*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%04x, ", EXTRACT_16BITS(ptr))); ptr++; /* Disconnect Code */
476*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(ptr))); ptr++; /* Control Protocol Number */
477*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%s", tok2str(l2tp_cc_direction2str,
478*b636d99dSDavid van Moolenbroek "Direction-#%u", *((u_char *)ptr++))));
479*b636d99dSDavid van Moolenbroek
480*b636d99dSDavid van Moolenbroek if (length > 5) {
481*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " "));
482*b636d99dSDavid van Moolenbroek print_string(ndo, (const u_char *)ptr, length-5);
483*b636d99dSDavid van Moolenbroek }
484*b636d99dSDavid van Moolenbroek }
485*b636d99dSDavid van Moolenbroek
486*b636d99dSDavid van Moolenbroek static void
l2tp_avp_print(netdissect_options * ndo,const u_char * dat,int length)487*b636d99dSDavid van Moolenbroek l2tp_avp_print(netdissect_options *ndo, const u_char *dat, int length)
488*b636d99dSDavid van Moolenbroek {
489*b636d99dSDavid van Moolenbroek u_int len;
490*b636d99dSDavid van Moolenbroek const uint16_t *ptr = (uint16_t *)dat;
491*b636d99dSDavid van Moolenbroek uint16_t attr_type;
492*b636d99dSDavid van Moolenbroek int hidden = FALSE;
493*b636d99dSDavid van Moolenbroek
494*b636d99dSDavid van Moolenbroek if (length <= 0) {
495*b636d99dSDavid van Moolenbroek return;
496*b636d99dSDavid van Moolenbroek }
497*b636d99dSDavid van Moolenbroek
498*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " "));
499*b636d99dSDavid van Moolenbroek
500*b636d99dSDavid van Moolenbroek ND_TCHECK(*ptr); /* Flags & Length */
501*b636d99dSDavid van Moolenbroek len = EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_LEN_MASK;
502*b636d99dSDavid van Moolenbroek
503*b636d99dSDavid van Moolenbroek /* If it is not long enough to contain the header, we'll give up. */
504*b636d99dSDavid van Moolenbroek if (len < 6)
505*b636d99dSDavid van Moolenbroek goto trunc;
506*b636d99dSDavid van Moolenbroek
507*b636d99dSDavid van Moolenbroek /* If it goes past the end of the remaining length of the packet,
508*b636d99dSDavid van Moolenbroek we'll give up. */
509*b636d99dSDavid van Moolenbroek if (len > (u_int)length)
510*b636d99dSDavid van Moolenbroek goto trunc;
511*b636d99dSDavid van Moolenbroek
512*b636d99dSDavid van Moolenbroek /* If it goes past the end of the remaining length of the captured
513*b636d99dSDavid van Moolenbroek data, we'll give up. */
514*b636d99dSDavid van Moolenbroek ND_TCHECK2(*ptr, len);
515*b636d99dSDavid van Moolenbroek /* After this point, no need to worry about truncation */
516*b636d99dSDavid van Moolenbroek
517*b636d99dSDavid van Moolenbroek if (EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_FLAG_MANDATORY) {
518*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "*"));
519*b636d99dSDavid van Moolenbroek }
520*b636d99dSDavid van Moolenbroek if (EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_FLAG_HIDDEN) {
521*b636d99dSDavid van Moolenbroek hidden = TRUE;
522*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "?"));
523*b636d99dSDavid van Moolenbroek }
524*b636d99dSDavid van Moolenbroek ptr++;
525*b636d99dSDavid van Moolenbroek
526*b636d99dSDavid van Moolenbroek if (EXTRACT_16BITS(ptr)) {
527*b636d99dSDavid van Moolenbroek /* Vendor Specific Attribute */
528*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "VENDOR%04x:", EXTRACT_16BITS(ptr))); ptr++;
529*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "ATTR%04x", EXTRACT_16BITS(ptr))); ptr++;
530*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "("));
531*b636d99dSDavid van Moolenbroek print_octets(ndo, (u_char *)ptr, len-6);
532*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, ")"));
533*b636d99dSDavid van Moolenbroek } else {
534*b636d99dSDavid van Moolenbroek /* IETF-defined Attributes */
535*b636d99dSDavid van Moolenbroek ptr++;
536*b636d99dSDavid van Moolenbroek attr_type = EXTRACT_16BITS(ptr); ptr++;
537*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%s", tok2str(l2tp_avp2str, "AVP-#%u", attr_type)));
538*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "("));
539*b636d99dSDavid van Moolenbroek if (hidden) {
540*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "???"));
541*b636d99dSDavid van Moolenbroek } else {
542*b636d99dSDavid van Moolenbroek switch (attr_type) {
543*b636d99dSDavid van Moolenbroek case L2TP_AVP_MSGTYPE:
544*b636d99dSDavid van Moolenbroek l2tp_msgtype_print(ndo, (u_char *)ptr);
545*b636d99dSDavid van Moolenbroek break;
546*b636d99dSDavid van Moolenbroek case L2TP_AVP_RESULT_CODE:
547*b636d99dSDavid van Moolenbroek l2tp_result_code_print(ndo, (u_char *)ptr, len-6);
548*b636d99dSDavid van Moolenbroek break;
549*b636d99dSDavid van Moolenbroek case L2TP_AVP_PROTO_VER:
550*b636d99dSDavid van Moolenbroek l2tp_proto_ver_print(ndo, ptr);
551*b636d99dSDavid van Moolenbroek break;
552*b636d99dSDavid van Moolenbroek case L2TP_AVP_FRAMING_CAP:
553*b636d99dSDavid van Moolenbroek l2tp_framing_cap_print(ndo, (u_char *)ptr);
554*b636d99dSDavid van Moolenbroek break;
555*b636d99dSDavid van Moolenbroek case L2TP_AVP_BEARER_CAP:
556*b636d99dSDavid van Moolenbroek l2tp_bearer_cap_print(ndo, (u_char *)ptr);
557*b636d99dSDavid van Moolenbroek break;
558*b636d99dSDavid van Moolenbroek case L2TP_AVP_TIE_BREAKER:
559*b636d99dSDavid van Moolenbroek print_octets(ndo, (u_char *)ptr, 8);
560*b636d99dSDavid van Moolenbroek break;
561*b636d99dSDavid van Moolenbroek case L2TP_AVP_FIRM_VER:
562*b636d99dSDavid van Moolenbroek case L2TP_AVP_ASSND_TUN_ID:
563*b636d99dSDavid van Moolenbroek case L2TP_AVP_RECV_WIN_SIZE:
564*b636d99dSDavid van Moolenbroek case L2TP_AVP_ASSND_SESS_ID:
565*b636d99dSDavid van Moolenbroek print_16bits_val(ndo, ptr);
566*b636d99dSDavid van Moolenbroek break;
567*b636d99dSDavid van Moolenbroek case L2TP_AVP_HOST_NAME:
568*b636d99dSDavid van Moolenbroek case L2TP_AVP_VENDOR_NAME:
569*b636d99dSDavid van Moolenbroek case L2TP_AVP_CALLING_NUMBER:
570*b636d99dSDavid van Moolenbroek case L2TP_AVP_CALLED_NUMBER:
571*b636d99dSDavid van Moolenbroek case L2TP_AVP_SUB_ADDRESS:
572*b636d99dSDavid van Moolenbroek case L2TP_AVP_PROXY_AUTH_NAME:
573*b636d99dSDavid van Moolenbroek case L2TP_AVP_PRIVATE_GRP_ID:
574*b636d99dSDavid van Moolenbroek print_string(ndo, (u_char *)ptr, len-6);
575*b636d99dSDavid van Moolenbroek break;
576*b636d99dSDavid van Moolenbroek case L2TP_AVP_CHALLENGE:
577*b636d99dSDavid van Moolenbroek case L2TP_AVP_INI_RECV_LCP:
578*b636d99dSDavid van Moolenbroek case L2TP_AVP_LAST_SENT_LCP:
579*b636d99dSDavid van Moolenbroek case L2TP_AVP_LAST_RECV_LCP:
580*b636d99dSDavid van Moolenbroek case L2TP_AVP_PROXY_AUTH_CHAL:
581*b636d99dSDavid van Moolenbroek case L2TP_AVP_PROXY_AUTH_RESP:
582*b636d99dSDavid van Moolenbroek case L2TP_AVP_RANDOM_VECTOR:
583*b636d99dSDavid van Moolenbroek print_octets(ndo, (u_char *)ptr, len-6);
584*b636d99dSDavid van Moolenbroek break;
585*b636d99dSDavid van Moolenbroek case L2TP_AVP_Q931_CC:
586*b636d99dSDavid van Moolenbroek l2tp_q931_cc_print(ndo, (u_char *)ptr, len-6);
587*b636d99dSDavid van Moolenbroek break;
588*b636d99dSDavid van Moolenbroek case L2TP_AVP_CHALLENGE_RESP:
589*b636d99dSDavid van Moolenbroek print_octets(ndo, (u_char *)ptr, 16);
590*b636d99dSDavid van Moolenbroek break;
591*b636d99dSDavid van Moolenbroek case L2TP_AVP_CALL_SER_NUM:
592*b636d99dSDavid van Moolenbroek case L2TP_AVP_MINIMUM_BPS:
593*b636d99dSDavid van Moolenbroek case L2TP_AVP_MAXIMUM_BPS:
594*b636d99dSDavid van Moolenbroek case L2TP_AVP_TX_CONN_SPEED:
595*b636d99dSDavid van Moolenbroek case L2TP_AVP_PHY_CHANNEL_ID:
596*b636d99dSDavid van Moolenbroek case L2TP_AVP_RX_CONN_SPEED:
597*b636d99dSDavid van Moolenbroek print_32bits_val(ndo, (uint32_t *)ptr);
598*b636d99dSDavid van Moolenbroek break;
599*b636d99dSDavid van Moolenbroek case L2TP_AVP_BEARER_TYPE:
600*b636d99dSDavid van Moolenbroek l2tp_bearer_type_print(ndo, (u_char *)ptr);
601*b636d99dSDavid van Moolenbroek break;
602*b636d99dSDavid van Moolenbroek case L2TP_AVP_FRAMING_TYPE:
603*b636d99dSDavid van Moolenbroek l2tp_framing_type_print(ndo, (u_char *)ptr);
604*b636d99dSDavid van Moolenbroek break;
605*b636d99dSDavid van Moolenbroek case L2TP_AVP_PACKET_PROC_DELAY:
606*b636d99dSDavid van Moolenbroek l2tp_packet_proc_delay_print(ndo);
607*b636d99dSDavid van Moolenbroek break;
608*b636d99dSDavid van Moolenbroek case L2TP_AVP_PROXY_AUTH_TYPE:
609*b636d99dSDavid van Moolenbroek l2tp_proxy_auth_type_print(ndo, (u_char *)ptr);
610*b636d99dSDavid van Moolenbroek break;
611*b636d99dSDavid van Moolenbroek case L2TP_AVP_PROXY_AUTH_ID:
612*b636d99dSDavid van Moolenbroek l2tp_proxy_auth_id_print(ndo, (u_char *)ptr);
613*b636d99dSDavid van Moolenbroek break;
614*b636d99dSDavid van Moolenbroek case L2TP_AVP_CALL_ERRORS:
615*b636d99dSDavid van Moolenbroek l2tp_call_errors_print(ndo, (u_char *)ptr);
616*b636d99dSDavid van Moolenbroek break;
617*b636d99dSDavid van Moolenbroek case L2TP_AVP_ACCM:
618*b636d99dSDavid van Moolenbroek l2tp_accm_print(ndo, (u_char *)ptr);
619*b636d99dSDavid van Moolenbroek break;
620*b636d99dSDavid van Moolenbroek case L2TP_AVP_SEQ_REQUIRED:
621*b636d99dSDavid van Moolenbroek break; /* No Attribute Value */
622*b636d99dSDavid van Moolenbroek case L2TP_AVP_PPP_DISCON_CC:
623*b636d99dSDavid van Moolenbroek l2tp_ppp_discon_cc_print(ndo, (u_char *)ptr, len-6);
624*b636d99dSDavid van Moolenbroek break;
625*b636d99dSDavid van Moolenbroek default:
626*b636d99dSDavid van Moolenbroek break;
627*b636d99dSDavid van Moolenbroek }
628*b636d99dSDavid van Moolenbroek }
629*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, ")"));
630*b636d99dSDavid van Moolenbroek }
631*b636d99dSDavid van Moolenbroek
632*b636d99dSDavid van Moolenbroek l2tp_avp_print(ndo, dat+len, length-len);
633*b636d99dSDavid van Moolenbroek return;
634*b636d99dSDavid van Moolenbroek
635*b636d99dSDavid van Moolenbroek trunc:
636*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "|..."));
637*b636d99dSDavid van Moolenbroek }
638*b636d99dSDavid van Moolenbroek
639*b636d99dSDavid van Moolenbroek
640*b636d99dSDavid van Moolenbroek void
l2tp_print(netdissect_options * ndo,const u_char * dat,u_int length)641*b636d99dSDavid van Moolenbroek l2tp_print(netdissect_options *ndo, const u_char *dat, u_int length)
642*b636d99dSDavid van Moolenbroek {
643*b636d99dSDavid van Moolenbroek const u_char *ptr = dat;
644*b636d99dSDavid van Moolenbroek u_int cnt = 0; /* total octets consumed */
645*b636d99dSDavid van Moolenbroek uint16_t pad;
646*b636d99dSDavid van Moolenbroek int flag_t, flag_l, flag_s, flag_o;
647*b636d99dSDavid van Moolenbroek uint16_t l2tp_len;
648*b636d99dSDavid van Moolenbroek
649*b636d99dSDavid van Moolenbroek flag_t = flag_l = flag_s = flag_o = FALSE;
650*b636d99dSDavid van Moolenbroek
651*b636d99dSDavid van Moolenbroek ND_TCHECK2(*ptr, 2); /* Flags & Version */
652*b636d99dSDavid van Moolenbroek if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2TP) {
653*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " l2tp:"));
654*b636d99dSDavid van Moolenbroek } else if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2F) {
655*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " l2f:"));
656*b636d99dSDavid van Moolenbroek return; /* nothing to do */
657*b636d99dSDavid van Moolenbroek } else {
658*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " Unknown Version, neither L2F(1) nor L2TP(2)"));
659*b636d99dSDavid van Moolenbroek return; /* nothing we can do */
660*b636d99dSDavid van Moolenbroek }
661*b636d99dSDavid van Moolenbroek
662*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "["));
663*b636d99dSDavid van Moolenbroek if (EXTRACT_16BITS(ptr) & L2TP_FLAG_TYPE) {
664*b636d99dSDavid van Moolenbroek flag_t = TRUE;
665*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "T"));
666*b636d99dSDavid van Moolenbroek }
667*b636d99dSDavid van Moolenbroek if (EXTRACT_16BITS(ptr) & L2TP_FLAG_LENGTH) {
668*b636d99dSDavid van Moolenbroek flag_l = TRUE;
669*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "L"));
670*b636d99dSDavid van Moolenbroek }
671*b636d99dSDavid van Moolenbroek if (EXTRACT_16BITS(ptr) & L2TP_FLAG_SEQUENCE) {
672*b636d99dSDavid van Moolenbroek flag_s = TRUE;
673*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "S"));
674*b636d99dSDavid van Moolenbroek }
675*b636d99dSDavid van Moolenbroek if (EXTRACT_16BITS(ptr) & L2TP_FLAG_OFFSET) {
676*b636d99dSDavid van Moolenbroek flag_o = TRUE;
677*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "O"));
678*b636d99dSDavid van Moolenbroek }
679*b636d99dSDavid van Moolenbroek if (EXTRACT_16BITS(ptr) & L2TP_FLAG_PRIORITY)
680*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "P"));
681*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "]"));
682*b636d99dSDavid van Moolenbroek
683*b636d99dSDavid van Moolenbroek ptr += 2;
684*b636d99dSDavid van Moolenbroek cnt += 2;
685*b636d99dSDavid van Moolenbroek
686*b636d99dSDavid van Moolenbroek if (flag_l) {
687*b636d99dSDavid van Moolenbroek ND_TCHECK2(*ptr, 2); /* Length */
688*b636d99dSDavid van Moolenbroek l2tp_len = EXTRACT_16BITS(ptr);
689*b636d99dSDavid van Moolenbroek ptr += 2;
690*b636d99dSDavid van Moolenbroek cnt += 2;
691*b636d99dSDavid van Moolenbroek } else {
692*b636d99dSDavid van Moolenbroek l2tp_len = 0;
693*b636d99dSDavid van Moolenbroek }
694*b636d99dSDavid van Moolenbroek
695*b636d99dSDavid van Moolenbroek ND_TCHECK2(*ptr, 2); /* Tunnel ID */
696*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "(%u/", EXTRACT_16BITS(ptr)));
697*b636d99dSDavid van Moolenbroek ptr += 2;
698*b636d99dSDavid van Moolenbroek cnt += 2;
699*b636d99dSDavid van Moolenbroek ND_TCHECK2(*ptr, 2); /* Session ID */
700*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%u)", EXTRACT_16BITS(ptr)));
701*b636d99dSDavid van Moolenbroek ptr += 2;
702*b636d99dSDavid van Moolenbroek cnt += 2;
703*b636d99dSDavid van Moolenbroek
704*b636d99dSDavid van Moolenbroek if (flag_s) {
705*b636d99dSDavid van Moolenbroek ND_TCHECK2(*ptr, 2); /* Ns */
706*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "Ns=%u,", EXTRACT_16BITS(ptr)));
707*b636d99dSDavid van Moolenbroek ptr += 2;
708*b636d99dSDavid van Moolenbroek cnt += 2;
709*b636d99dSDavid van Moolenbroek ND_TCHECK2(*ptr, 2); /* Nr */
710*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "Nr=%u", EXTRACT_16BITS(ptr)));
711*b636d99dSDavid van Moolenbroek ptr += 2;
712*b636d99dSDavid van Moolenbroek cnt += 2;
713*b636d99dSDavid van Moolenbroek }
714*b636d99dSDavid van Moolenbroek
715*b636d99dSDavid van Moolenbroek if (flag_o) {
716*b636d99dSDavid van Moolenbroek ND_TCHECK2(*ptr, 2); /* Offset Size */
717*b636d99dSDavid van Moolenbroek pad = EXTRACT_16BITS(ptr);
718*b636d99dSDavid van Moolenbroek ptr += (2 + pad);
719*b636d99dSDavid van Moolenbroek cnt += (2 + pad);
720*b636d99dSDavid van Moolenbroek }
721*b636d99dSDavid van Moolenbroek
722*b636d99dSDavid van Moolenbroek if (flag_l) {
723*b636d99dSDavid van Moolenbroek if (length < l2tp_len) {
724*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " Length %u larger than packet", l2tp_len));
725*b636d99dSDavid van Moolenbroek return;
726*b636d99dSDavid van Moolenbroek }
727*b636d99dSDavid van Moolenbroek length = l2tp_len;
728*b636d99dSDavid van Moolenbroek }
729*b636d99dSDavid van Moolenbroek if (length < cnt) {
730*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " Length %u smaller than header length", length));
731*b636d99dSDavid van Moolenbroek return;
732*b636d99dSDavid van Moolenbroek }
733*b636d99dSDavid van Moolenbroek if (flag_t) {
734*b636d99dSDavid van Moolenbroek if (!flag_l) {
735*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " No length"));
736*b636d99dSDavid van Moolenbroek return;
737*b636d99dSDavid van Moolenbroek }
738*b636d99dSDavid van Moolenbroek if (length - cnt == 0) {
739*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " ZLB"));
740*b636d99dSDavid van Moolenbroek } else {
741*b636d99dSDavid van Moolenbroek l2tp_avp_print(ndo, ptr, length - cnt);
742*b636d99dSDavid van Moolenbroek }
743*b636d99dSDavid van Moolenbroek } else {
744*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, " {"));
745*b636d99dSDavid van Moolenbroek ppp_print(ndo, ptr, length - cnt);
746*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "}"));
747*b636d99dSDavid van Moolenbroek }
748*b636d99dSDavid van Moolenbroek
749*b636d99dSDavid van Moolenbroek return;
750*b636d99dSDavid van Moolenbroek
751*b636d99dSDavid van Moolenbroek trunc:
752*b636d99dSDavid van Moolenbroek ND_PRINT((ndo, "%s", tstr));
753*b636d99dSDavid van Moolenbroek }
754