The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that: (1) source code distributions |
| 7 | * retain the above copyright notice and this paragraph in its entirety, (2) |
| 8 | * distributions including binary code include the above copyright notice and |
| 9 | * this paragraph in its entirety in the documentation or other materials |
| 10 | * provided with the distribution, and (3) all advertising materials mentioning |
| 11 | * features or use of this software display the following acknowledgement: |
| 12 | * ``This product includes software developed by the University of California, |
| 13 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| 14 | * the University nor the names of its contributors may be used to endorse |
| 15 | * or promote products derived from this software without specific prior |
| 16 | * written permission. |
| 17 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| 18 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| 19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 20 | * |
| 21 | * L2TP support contributed by Motonori Shindo (mshindo@mshindo.net) |
| 22 | */ |
| 23 | |
| 24 | #ifndef lint |
| 25 | static const char rcsid[] _U_ = |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 26 | "@(#) $Header: /tcpdump/master/tcpdump/print-l2tp.c,v 1.20 2006-06-23 02:03:09 hannes Exp $"; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 27 | #endif |
| 28 | |
| 29 | #ifdef HAVE_CONFIG_H |
| 30 | #include "config.h" |
| 31 | #endif |
| 32 | |
| 33 | #include <tcpdump-stdinc.h> |
| 34 | |
| 35 | #include <stdio.h> |
| 36 | |
| 37 | #include "l2tp.h" |
| 38 | #include "interface.h" |
| 39 | #include "extract.h" |
| 40 | |
| 41 | static char tstr[] = " [|l2tp]"; |
| 42 | |
| 43 | #define L2TP_MSGTYPE_SCCRQ 1 /* Start-Control-Connection-Request */ |
| 44 | #define L2TP_MSGTYPE_SCCRP 2 /* Start-Control-Connection-Reply */ |
| 45 | #define L2TP_MSGTYPE_SCCCN 3 /* Start-Control-Connection-Connected */ |
| 46 | #define L2TP_MSGTYPE_STOPCCN 4 /* Stop-Control-Connection-Notification */ |
| 47 | #define L2TP_MSGTYPE_HELLO 6 /* Hello */ |
| 48 | #define L2TP_MSGTYPE_OCRQ 7 /* Outgoing-Call-Request */ |
| 49 | #define L2TP_MSGTYPE_OCRP 8 /* Outgoing-Call-Reply */ |
| 50 | #define L2TP_MSGTYPE_OCCN 9 /* Outgoing-Call-Connected */ |
| 51 | #define L2TP_MSGTYPE_ICRQ 10 /* Incoming-Call-Request */ |
| 52 | #define L2TP_MSGTYPE_ICRP 11 /* Incoming-Call-Reply */ |
| 53 | #define L2TP_MSGTYPE_ICCN 12 /* Incoming-Call-Connected */ |
| 54 | #define L2TP_MSGTYPE_CDN 14 /* Call-Disconnect-Notify */ |
| 55 | #define L2TP_MSGTYPE_WEN 15 /* WAN-Error-Notify */ |
| 56 | #define L2TP_MSGTYPE_SLI 16 /* Set-Link-Info */ |
| 57 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 58 | static const struct tok l2tp_msgtype2str[] = { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 59 | { L2TP_MSGTYPE_SCCRQ, "SCCRQ" }, |
| 60 | { L2TP_MSGTYPE_SCCRP, "SCCRP" }, |
| 61 | { L2TP_MSGTYPE_SCCCN, "SCCCN" }, |
| 62 | { L2TP_MSGTYPE_STOPCCN, "StopCCN" }, |
| 63 | { L2TP_MSGTYPE_HELLO, "HELLO" }, |
| 64 | { L2TP_MSGTYPE_OCRQ, "OCRQ" }, |
| 65 | { L2TP_MSGTYPE_OCRP, "OCRP" }, |
| 66 | { L2TP_MSGTYPE_OCCN, "OCCN" }, |
| 67 | { L2TP_MSGTYPE_ICRQ, "ICRQ" }, |
| 68 | { L2TP_MSGTYPE_ICRP, "ICRP" }, |
| 69 | { L2TP_MSGTYPE_ICCN, "ICCN" }, |
| 70 | { L2TP_MSGTYPE_CDN, "CDN" }, |
| 71 | { L2TP_MSGTYPE_WEN, "WEN" }, |
| 72 | { L2TP_MSGTYPE_SLI, "SLI" }, |
| 73 | { 0, NULL } |
| 74 | }; |
| 75 | |
| 76 | #define L2TP_AVP_MSGTYPE 0 /* Message Type */ |
| 77 | #define L2TP_AVP_RESULT_CODE 1 /* Result Code */ |
| 78 | #define L2TP_AVP_PROTO_VER 2 /* Protocol Version */ |
| 79 | #define L2TP_AVP_FRAMING_CAP 3 /* Framing Capabilities */ |
| 80 | #define L2TP_AVP_BEARER_CAP 4 /* Bearer Capabilities */ |
| 81 | #define L2TP_AVP_TIE_BREAKER 5 /* Tie Breaker */ |
| 82 | #define L2TP_AVP_FIRM_VER 6 /* Firmware Revision */ |
| 83 | #define L2TP_AVP_HOST_NAME 7 /* Host Name */ |
| 84 | #define L2TP_AVP_VENDOR_NAME 8 /* Vendor Name */ |
| 85 | #define L2TP_AVP_ASSND_TUN_ID 9 /* Assigned Tunnel ID */ |
| 86 | #define L2TP_AVP_RECV_WIN_SIZE 10 /* Receive Window Size */ |
| 87 | #define L2TP_AVP_CHALLENGE 11 /* Challenge */ |
| 88 | #define L2TP_AVP_Q931_CC 12 /* Q.931 Cause Code */ |
| 89 | #define L2TP_AVP_CHALLENGE_RESP 13 /* Challenge Response */ |
| 90 | #define L2TP_AVP_ASSND_SESS_ID 14 /* Assigned Session ID */ |
| 91 | #define L2TP_AVP_CALL_SER_NUM 15 /* Call Serial Number */ |
| 92 | #define L2TP_AVP_MINIMUM_BPS 16 /* Minimum BPS */ |
| 93 | #define L2TP_AVP_MAXIMUM_BPS 17 /* Maximum BPS */ |
| 94 | #define L2TP_AVP_BEARER_TYPE 18 /* Bearer Type */ |
| 95 | #define L2TP_AVP_FRAMING_TYPE 19 /* Framing Type */ |
| 96 | #define L2TP_AVP_PACKET_PROC_DELAY 20 /* Packet Processing Delay (OBSOLETE) */ |
| 97 | #define L2TP_AVP_CALLED_NUMBER 21 /* Called Number */ |
| 98 | #define L2TP_AVP_CALLING_NUMBER 22 /* Calling Number */ |
| 99 | #define L2TP_AVP_SUB_ADDRESS 23 /* Sub-Address */ |
| 100 | #define L2TP_AVP_TX_CONN_SPEED 24 /* (Tx) Connect Speed */ |
| 101 | #define L2TP_AVP_PHY_CHANNEL_ID 25 /* Physical Channel ID */ |
| 102 | #define L2TP_AVP_INI_RECV_LCP 26 /* Initial Received LCP CONFREQ */ |
| 103 | #define L2TP_AVP_LAST_SENT_LCP 27 /* Last Sent LCP CONFREQ */ |
| 104 | #define L2TP_AVP_LAST_RECV_LCP 28 /* Last Received LCP CONFREQ */ |
| 105 | #define L2TP_AVP_PROXY_AUTH_TYPE 29 /* Proxy Authen Type */ |
| 106 | #define L2TP_AVP_PROXY_AUTH_NAME 30 /* Proxy Authen Name */ |
| 107 | #define L2TP_AVP_PROXY_AUTH_CHAL 31 /* Proxy Authen Challenge */ |
| 108 | #define L2TP_AVP_PROXY_AUTH_ID 32 /* Proxy Authen ID */ |
| 109 | #define L2TP_AVP_PROXY_AUTH_RESP 33 /* Proxy Authen Response */ |
| 110 | #define L2TP_AVP_CALL_ERRORS 34 /* Call Errors */ |
| 111 | #define L2TP_AVP_ACCM 35 /* ACCM */ |
| 112 | #define L2TP_AVP_RANDOM_VECTOR 36 /* Random Vector */ |
| 113 | #define L2TP_AVP_PRIVATE_GRP_ID 37 /* Private Group ID */ |
| 114 | #define L2TP_AVP_RX_CONN_SPEED 38 /* (Rx) Connect Speed */ |
| 115 | #define L2TP_AVP_SEQ_REQUIRED 39 /* Sequencing Required */ |
| 116 | #define L2TP_AVP_PPP_DISCON_CC 46 /* PPP Disconnect Cause Code */ |
| 117 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 118 | static const struct tok l2tp_avp2str[] = { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 119 | { L2TP_AVP_MSGTYPE, "MSGTYPE" }, |
| 120 | { L2TP_AVP_RESULT_CODE, "RESULT_CODE" }, |
| 121 | { L2TP_AVP_PROTO_VER, "PROTO_VER" }, |
| 122 | { L2TP_AVP_FRAMING_CAP, "FRAMING_CAP" }, |
| 123 | { L2TP_AVP_BEARER_CAP, "BEARER_CAP" }, |
| 124 | { L2TP_AVP_TIE_BREAKER, "TIE_BREAKER" }, |
| 125 | { L2TP_AVP_FIRM_VER, "FIRM_VER" }, |
| 126 | { L2TP_AVP_HOST_NAME, "HOST_NAME" }, |
| 127 | { L2TP_AVP_VENDOR_NAME, "VENDOR_NAME" }, |
| 128 | { L2TP_AVP_ASSND_TUN_ID, "ASSND_TUN_ID" }, |
| 129 | { L2TP_AVP_RECV_WIN_SIZE, "RECV_WIN_SIZE" }, |
| 130 | { L2TP_AVP_CHALLENGE, "CHALLENGE" }, |
| 131 | { L2TP_AVP_Q931_CC, "Q931_CC", }, |
| 132 | { L2TP_AVP_CHALLENGE_RESP, "CHALLENGE_RESP" }, |
| 133 | { L2TP_AVP_ASSND_SESS_ID, "ASSND_SESS_ID" }, |
| 134 | { L2TP_AVP_CALL_SER_NUM, "CALL_SER_NUM" }, |
| 135 | { L2TP_AVP_MINIMUM_BPS, "MINIMUM_BPS" }, |
| 136 | { L2TP_AVP_MAXIMUM_BPS, "MAXIMUM_BPS" }, |
| 137 | { L2TP_AVP_BEARER_TYPE, "BEARER_TYPE" }, |
| 138 | { L2TP_AVP_FRAMING_TYPE, "FRAMING_TYPE" }, |
| 139 | { L2TP_AVP_PACKET_PROC_DELAY, "PACKET_PROC_DELAY" }, |
| 140 | { L2TP_AVP_CALLED_NUMBER, "CALLED_NUMBER" }, |
| 141 | { L2TP_AVP_CALLING_NUMBER, "CALLING_NUMBER" }, |
| 142 | { L2TP_AVP_SUB_ADDRESS, "SUB_ADDRESS" }, |
| 143 | { L2TP_AVP_TX_CONN_SPEED, "TX_CONN_SPEED" }, |
| 144 | { L2TP_AVP_PHY_CHANNEL_ID, "PHY_CHANNEL_ID" }, |
| 145 | { L2TP_AVP_INI_RECV_LCP, "INI_RECV_LCP" }, |
| 146 | { L2TP_AVP_LAST_SENT_LCP, "LAST_SENT_LCP" }, |
| 147 | { L2TP_AVP_LAST_RECV_LCP, "LAST_RECV_LCP" }, |
| 148 | { L2TP_AVP_PROXY_AUTH_TYPE, "PROXY_AUTH_TYPE" }, |
| 149 | { L2TP_AVP_PROXY_AUTH_NAME, "PROXY_AUTH_NAME" }, |
| 150 | { L2TP_AVP_PROXY_AUTH_CHAL, "PROXY_AUTH_CHAL" }, |
| 151 | { L2TP_AVP_PROXY_AUTH_ID, "PROXY_AUTH_ID" }, |
| 152 | { L2TP_AVP_PROXY_AUTH_RESP, "PROXY_AUTH_RESP" }, |
| 153 | { L2TP_AVP_CALL_ERRORS, "CALL_ERRORS" }, |
| 154 | { L2TP_AVP_ACCM, "ACCM" }, |
| 155 | { L2TP_AVP_RANDOM_VECTOR, "RANDOM_VECTOR" }, |
| 156 | { L2TP_AVP_PRIVATE_GRP_ID, "PRIVATE_GRP_ID" }, |
| 157 | { L2TP_AVP_RX_CONN_SPEED, "RX_CONN_SPEED" }, |
| 158 | { L2TP_AVP_SEQ_REQUIRED, "SEQ_REQUIRED" }, |
| 159 | { L2TP_AVP_PPP_DISCON_CC, "PPP_DISCON_CC" }, |
| 160 | { 0, NULL } |
| 161 | }; |
| 162 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 163 | static const struct tok l2tp_authentype2str[] = { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 164 | { L2TP_AUTHEN_TYPE_RESERVED, "Reserved" }, |
| 165 | { L2TP_AUTHEN_TYPE_TEXTUAL, "Textual" }, |
| 166 | { L2TP_AUTHEN_TYPE_CHAP, "CHAP" }, |
| 167 | { L2TP_AUTHEN_TYPE_PAP, "PAP" }, |
| 168 | { L2TP_AUTHEN_TYPE_NO_AUTH, "No Auth" }, |
| 169 | { L2TP_AUTHEN_TYPE_MSCHAPv1, "MS-CHAPv1" }, |
| 170 | { 0, NULL } |
| 171 | }; |
| 172 | |
| 173 | #define L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL 0 |
| 174 | #define L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER 1 |
| 175 | #define L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL 2 |
| 176 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 177 | static const struct tok l2tp_cc_direction2str[] = { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 178 | { L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL, "global error" }, |
| 179 | { L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER, "at peer" }, |
| 180 | { L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL,"at local" }, |
| 181 | { 0, NULL } |
| 182 | }; |
| 183 | |
| 184 | #if 0 |
| 185 | static char *l2tp_result_code_StopCCN[] = { |
| 186 | "Reserved", |
| 187 | "General request to clear control connection", |
| 188 | "General error--Error Code indicates the problem", |
| 189 | "Control channel already exists", |
| 190 | "Requester is not authorized to establish a control channel", |
| 191 | "The protocol version of the requester is not supported", |
| 192 | "Requester is being shut down", |
| 193 | "Finite State Machine error" |
| 194 | #define L2TP_MAX_RESULT_CODE_STOPCC_INDEX 8 |
| 195 | }; |
| 196 | #endif |
| 197 | |
| 198 | #if 0 |
| 199 | static char *l2tp_result_code_CDN[] = { |
| 200 | "Reserved", |
| 201 | "Call disconnected due to loss of carrier", |
| 202 | "Call disconnected for the reason indicated in error code", |
| 203 | "Call disconnected for administrative reasons", |
| 204 | "Call failed due to lack of appropriate facilities being " \ |
| 205 | "available (temporary condition)", |
| 206 | "Call failed due to lack of appropriate facilities being " \ |
| 207 | "available (permanent condition)", |
| 208 | "Invalid destination", |
| 209 | "Call failed due to no carrier detected", |
| 210 | "Call failed due to detection of a busy signal", |
| 211 | "Call failed due to lack of a dial tone", |
| 212 | "Call was not established within time allotted by LAC", |
| 213 | "Call was connected but no appropriate framing was detected" |
| 214 | #define L2TP_MAX_RESULT_CODE_CDN_INDEX 12 |
| 215 | }; |
| 216 | #endif |
| 217 | |
| 218 | #if 0 |
| 219 | static char *l2tp_error_code_general[] = { |
| 220 | "No general error", |
| 221 | "No control connection exists yet for this LAC-LNS pair", |
| 222 | "Length is wrong", |
| 223 | "One of the field values was out of range or " \ |
| 224 | "reserved field was non-zero" |
| 225 | "Insufficient resources to handle this operation now", |
| 226 | "The Session ID is invalid in this context", |
| 227 | "A generic vendor-specific error occurred in the LAC", |
| 228 | "Try another" |
| 229 | #define L2TP_MAX_ERROR_CODE_GENERAL_INDEX 8 |
| 230 | }; |
| 231 | #endif |
| 232 | |
| 233 | /******************************/ |
| 234 | /* generic print out routines */ |
| 235 | /******************************/ |
| 236 | static void |
| 237 | print_string(const u_char *dat, u_int length) |
| 238 | { |
| 239 | u_int i; |
| 240 | for (i=0; i<length; i++) { |
| 241 | printf("%c", *dat++); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | static void |
| 246 | print_octets(const u_char *dat, u_int length) |
| 247 | { |
| 248 | u_int i; |
| 249 | for (i=0; i<length; i++) { |
| 250 | printf("%02x", *dat++); |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | static void |
| 255 | print_16bits_val(const u_int16_t *dat) |
| 256 | { |
| 257 | printf("%u", EXTRACT_16BITS(dat)); |
| 258 | } |
| 259 | |
| 260 | static void |
| 261 | print_32bits_val(const u_int32_t *dat) |
| 262 | { |
| 263 | printf("%lu", (u_long)EXTRACT_32BITS(dat)); |
| 264 | } |
| 265 | |
| 266 | /***********************************/ |
| 267 | /* AVP-specific print out routines */ |
| 268 | /***********************************/ |
| 269 | static void |
| 270 | l2tp_msgtype_print(const u_char *dat) |
| 271 | { |
| 272 | u_int16_t *ptr = (u_int16_t*)dat; |
| 273 | |
| 274 | printf("%s", tok2str(l2tp_msgtype2str, "MSGTYPE-#%u", |
| 275 | EXTRACT_16BITS(ptr))); |
| 276 | } |
| 277 | |
| 278 | static void |
| 279 | l2tp_result_code_print(const u_char *dat, u_int length) |
| 280 | { |
| 281 | u_int16_t *ptr = (u_int16_t *)dat; |
| 282 | |
| 283 | printf("%u", EXTRACT_16BITS(ptr)); ptr++; /* Result Code */ |
| 284 | if (length > 2) { /* Error Code (opt) */ |
| 285 | printf("/%u", EXTRACT_16BITS(ptr)); ptr++; |
| 286 | } |
| 287 | if (length > 4) { /* Error Message (opt) */ |
| 288 | printf(" "); |
| 289 | print_string((u_char *)ptr, length - 4); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | static void |
| 294 | l2tp_proto_ver_print(const u_int16_t *dat) |
| 295 | { |
| 296 | printf("%u.%u", (EXTRACT_16BITS(dat) >> 8), |
| 297 | (EXTRACT_16BITS(dat) & 0xff)); |
| 298 | } |
| 299 | |
| 300 | static void |
| 301 | l2tp_framing_cap_print(const u_char *dat) |
| 302 | { |
| 303 | u_int32_t *ptr = (u_int32_t *)dat; |
| 304 | |
| 305 | if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_CAP_ASYNC_MASK) { |
| 306 | printf("A"); |
| 307 | } |
| 308 | if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_CAP_SYNC_MASK) { |
| 309 | printf("S"); |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | static void |
| 314 | l2tp_bearer_cap_print(const u_char *dat) |
| 315 | { |
| 316 | u_int32_t *ptr = (u_int32_t *)dat; |
| 317 | |
| 318 | if (EXTRACT_32BITS(ptr) & L2TP_BEARER_CAP_ANALOG_MASK) { |
| 319 | printf("A"); |
| 320 | } |
| 321 | if (EXTRACT_32BITS(ptr) & L2TP_BEARER_CAP_DIGITAL_MASK) { |
| 322 | printf("D"); |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | static void |
| 327 | l2tp_q931_cc_print(const u_char *dat, u_int length) |
| 328 | { |
| 329 | print_16bits_val((u_int16_t *)dat); |
| 330 | printf(", %02x", dat[2]); |
| 331 | if (length > 3) { |
| 332 | printf(" "); |
| 333 | print_string(dat+3, length-3); |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | static void |
| 338 | l2tp_bearer_type_print(const u_char *dat) |
| 339 | { |
| 340 | u_int32_t *ptr = (u_int32_t *)dat; |
| 341 | |
| 342 | if (EXTRACT_32BITS(ptr) & L2TP_BEARER_TYPE_ANALOG_MASK) { |
| 343 | printf("A"); |
| 344 | } |
| 345 | if (EXTRACT_32BITS(ptr) & L2TP_BEARER_TYPE_DIGITAL_MASK) { |
| 346 | printf("D"); |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | static void |
| 351 | l2tp_framing_type_print(const u_char *dat) |
| 352 | { |
| 353 | u_int32_t *ptr = (u_int32_t *)dat; |
| 354 | |
| 355 | if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_TYPE_ASYNC_MASK) { |
| 356 | printf("A"); |
| 357 | } |
| 358 | if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_TYPE_SYNC_MASK) { |
| 359 | printf("S"); |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | static void |
| 364 | l2tp_packet_proc_delay_print(void) |
| 365 | { |
| 366 | printf("obsolete"); |
| 367 | } |
| 368 | |
| 369 | static void |
| 370 | l2tp_proxy_auth_type_print(const u_char *dat) |
| 371 | { |
| 372 | u_int16_t *ptr = (u_int16_t *)dat; |
| 373 | |
| 374 | printf("%s", tok2str(l2tp_authentype2str, |
| 375 | "AuthType-#%u", EXTRACT_16BITS(ptr))); |
| 376 | } |
| 377 | |
| 378 | static void |
| 379 | l2tp_proxy_auth_id_print(const u_char *dat) |
| 380 | { |
| 381 | u_int16_t *ptr = (u_int16_t *)dat; |
| 382 | |
| 383 | printf("%u", EXTRACT_16BITS(ptr) & L2TP_PROXY_AUTH_ID_MASK); |
| 384 | } |
| 385 | |
| 386 | static void |
| 387 | l2tp_call_errors_print(const u_char *dat) |
| 388 | { |
| 389 | u_int16_t *ptr = (u_int16_t *)dat; |
| 390 | u_int16_t val_h, val_l; |
| 391 | |
| 392 | ptr++; /* skip "Reserved" */ |
| 393 | |
| 394 | val_h = EXTRACT_16BITS(ptr); ptr++; |
| 395 | val_l = EXTRACT_16BITS(ptr); ptr++; |
| 396 | printf("CRCErr=%u ", (val_h<<16) + val_l); |
| 397 | |
| 398 | val_h = EXTRACT_16BITS(ptr); ptr++; |
| 399 | val_l = EXTRACT_16BITS(ptr); ptr++; |
| 400 | printf("FrameErr=%u ", (val_h<<16) + val_l); |
| 401 | |
| 402 | val_h = EXTRACT_16BITS(ptr); ptr++; |
| 403 | val_l = EXTRACT_16BITS(ptr); ptr++; |
| 404 | printf("HardOver=%u ", (val_h<<16) + val_l); |
| 405 | |
| 406 | val_h = EXTRACT_16BITS(ptr); ptr++; |
| 407 | val_l = EXTRACT_16BITS(ptr); ptr++; |
| 408 | printf("BufOver=%u ", (val_h<<16) + val_l); |
| 409 | |
| 410 | val_h = EXTRACT_16BITS(ptr); ptr++; |
| 411 | val_l = EXTRACT_16BITS(ptr); ptr++; |
| 412 | printf("Timeout=%u ", (val_h<<16) + val_l); |
| 413 | |
| 414 | val_h = EXTRACT_16BITS(ptr); ptr++; |
| 415 | val_l = EXTRACT_16BITS(ptr); ptr++; |
| 416 | printf("AlignErr=%u ", (val_h<<16) + val_l); |
| 417 | } |
| 418 | |
| 419 | static void |
| 420 | l2tp_accm_print(const u_char *dat) |
| 421 | { |
| 422 | u_int16_t *ptr = (u_int16_t *)dat; |
| 423 | u_int16_t val_h, val_l; |
| 424 | |
| 425 | ptr++; /* skip "Reserved" */ |
| 426 | |
| 427 | val_h = EXTRACT_16BITS(ptr); ptr++; |
| 428 | val_l = EXTRACT_16BITS(ptr); ptr++; |
| 429 | printf("send=%08x ", (val_h<<16) + val_l); |
| 430 | |
| 431 | val_h = EXTRACT_16BITS(ptr); ptr++; |
| 432 | val_l = EXTRACT_16BITS(ptr); ptr++; |
| 433 | printf("recv=%08x ", (val_h<<16) + val_l); |
| 434 | } |
| 435 | |
| 436 | static void |
| 437 | l2tp_ppp_discon_cc_print(const u_char *dat, u_int length) |
| 438 | { |
| 439 | u_int16_t *ptr = (u_int16_t *)dat; |
| 440 | |
| 441 | printf("%04x, ", EXTRACT_16BITS(ptr)); ptr++; /* Disconnect Code */ |
| 442 | printf("%04x ", EXTRACT_16BITS(ptr)); ptr++; /* Control Protocol Number */ |
| 443 | printf("%s", tok2str(l2tp_cc_direction2str, |
| 444 | "Direction-#%u", *((u_char *)ptr++))); |
| 445 | |
| 446 | if (length > 5) { |
| 447 | printf(" "); |
| 448 | print_string((const u_char *)ptr, length-5); |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | static void |
| 453 | l2tp_avp_print(const u_char *dat, int length) |
| 454 | { |
| 455 | u_int len; |
| 456 | const u_int16_t *ptr = (u_int16_t *)dat; |
| 457 | u_int16_t attr_type; |
| 458 | int hidden = FALSE; |
| 459 | |
| 460 | if (length <= 0) { |
| 461 | return; |
| 462 | } |
| 463 | |
| 464 | printf(" "); |
| 465 | |
| 466 | TCHECK(*ptr); /* Flags & Length */ |
| 467 | len = EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_LEN_MASK; |
| 468 | |
| 469 | /* If it is not long enough to contain the header, we'll give up. */ |
| 470 | if (len < 6) |
| 471 | goto trunc; |
| 472 | |
| 473 | /* If it goes past the end of the remaining length of the packet, |
| 474 | we'll give up. */ |
| 475 | if (len > (u_int)length) |
| 476 | goto trunc; |
| 477 | |
| 478 | /* If it goes past the end of the remaining length of the captured |
| 479 | data, we'll give up. */ |
| 480 | TCHECK2(*ptr, len); |
| 481 | /* After this point, no need to worry about truncation */ |
| 482 | |
| 483 | if (EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_FLAG_MANDATORY) { |
| 484 | printf("*"); |
| 485 | } |
| 486 | if (EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_FLAG_HIDDEN) { |
| 487 | hidden = TRUE; |
| 488 | printf("?"); |
| 489 | } |
| 490 | ptr++; |
| 491 | |
| 492 | if (EXTRACT_16BITS(ptr)) { |
| 493 | /* Vendor Specific Attribute */ |
| 494 | printf("VENDOR%04x:", EXTRACT_16BITS(ptr)); ptr++; |
| 495 | printf("ATTR%04x", EXTRACT_16BITS(ptr)); ptr++; |
| 496 | printf("("); |
| 497 | print_octets((u_char *)ptr, len-6); |
| 498 | printf(")"); |
| 499 | } else { |
| 500 | /* IETF-defined Attributes */ |
| 501 | ptr++; |
| 502 | attr_type = EXTRACT_16BITS(ptr); ptr++; |
| 503 | printf("%s", tok2str(l2tp_avp2str, "AVP-#%u", attr_type)); |
| 504 | printf("("); |
| 505 | if (hidden) { |
| 506 | printf("???"); |
| 507 | } else { |
| 508 | switch (attr_type) { |
| 509 | case L2TP_AVP_MSGTYPE: |
| 510 | l2tp_msgtype_print((u_char *)ptr); |
| 511 | break; |
| 512 | case L2TP_AVP_RESULT_CODE: |
| 513 | l2tp_result_code_print((u_char *)ptr, len-6); |
| 514 | break; |
| 515 | case L2TP_AVP_PROTO_VER: |
| 516 | l2tp_proto_ver_print(ptr); |
| 517 | break; |
| 518 | case L2TP_AVP_FRAMING_CAP: |
| 519 | l2tp_framing_cap_print((u_char *)ptr); |
| 520 | break; |
| 521 | case L2TP_AVP_BEARER_CAP: |
| 522 | l2tp_bearer_cap_print((u_char *)ptr); |
| 523 | break; |
| 524 | case L2TP_AVP_TIE_BREAKER: |
| 525 | print_octets((u_char *)ptr, 8); |
| 526 | break; |
| 527 | case L2TP_AVP_FIRM_VER: |
| 528 | case L2TP_AVP_ASSND_TUN_ID: |
| 529 | case L2TP_AVP_RECV_WIN_SIZE: |
| 530 | case L2TP_AVP_ASSND_SESS_ID: |
| 531 | print_16bits_val(ptr); |
| 532 | break; |
| 533 | case L2TP_AVP_HOST_NAME: |
| 534 | case L2TP_AVP_VENDOR_NAME: |
| 535 | case L2TP_AVP_CALLING_NUMBER: |
| 536 | case L2TP_AVP_CALLED_NUMBER: |
| 537 | case L2TP_AVP_SUB_ADDRESS: |
| 538 | case L2TP_AVP_PROXY_AUTH_NAME: |
| 539 | case L2TP_AVP_PRIVATE_GRP_ID: |
| 540 | print_string((u_char *)ptr, len-6); |
| 541 | break; |
| 542 | case L2TP_AVP_CHALLENGE: |
| 543 | case L2TP_AVP_INI_RECV_LCP: |
| 544 | case L2TP_AVP_LAST_SENT_LCP: |
| 545 | case L2TP_AVP_LAST_RECV_LCP: |
| 546 | case L2TP_AVP_PROXY_AUTH_CHAL: |
| 547 | case L2TP_AVP_PROXY_AUTH_RESP: |
| 548 | case L2TP_AVP_RANDOM_VECTOR: |
| 549 | print_octets((u_char *)ptr, len-6); |
| 550 | break; |
| 551 | case L2TP_AVP_Q931_CC: |
| 552 | l2tp_q931_cc_print((u_char *)ptr, len-6); |
| 553 | break; |
| 554 | case L2TP_AVP_CHALLENGE_RESP: |
| 555 | print_octets((u_char *)ptr, 16); |
| 556 | break; |
| 557 | case L2TP_AVP_CALL_SER_NUM: |
| 558 | case L2TP_AVP_MINIMUM_BPS: |
| 559 | case L2TP_AVP_MAXIMUM_BPS: |
| 560 | case L2TP_AVP_TX_CONN_SPEED: |
| 561 | case L2TP_AVP_PHY_CHANNEL_ID: |
| 562 | case L2TP_AVP_RX_CONN_SPEED: |
| 563 | print_32bits_val((u_int32_t *)ptr); |
| 564 | break; |
| 565 | case L2TP_AVP_BEARER_TYPE: |
| 566 | l2tp_bearer_type_print((u_char *)ptr); |
| 567 | break; |
| 568 | case L2TP_AVP_FRAMING_TYPE: |
| 569 | l2tp_framing_type_print((u_char *)ptr); |
| 570 | break; |
| 571 | case L2TP_AVP_PACKET_PROC_DELAY: |
| 572 | l2tp_packet_proc_delay_print(); |
| 573 | break; |
| 574 | case L2TP_AVP_PROXY_AUTH_TYPE: |
| 575 | l2tp_proxy_auth_type_print((u_char *)ptr); |
| 576 | break; |
| 577 | case L2TP_AVP_PROXY_AUTH_ID: |
| 578 | l2tp_proxy_auth_id_print((u_char *)ptr); |
| 579 | break; |
| 580 | case L2TP_AVP_CALL_ERRORS: |
| 581 | l2tp_call_errors_print((u_char *)ptr); |
| 582 | break; |
| 583 | case L2TP_AVP_ACCM: |
| 584 | l2tp_accm_print((u_char *)ptr); |
| 585 | break; |
| 586 | case L2TP_AVP_SEQ_REQUIRED: |
| 587 | break; /* No Attribute Value */ |
| 588 | case L2TP_AVP_PPP_DISCON_CC: |
| 589 | l2tp_ppp_discon_cc_print((u_char *)ptr, len-6); |
| 590 | break; |
| 591 | default: |
| 592 | break; |
| 593 | } |
| 594 | } |
| 595 | printf(")"); |
| 596 | } |
| 597 | |
| 598 | l2tp_avp_print(dat+len, length-len); |
| 599 | return; |
| 600 | |
| 601 | trunc: |
| 602 | printf("|..."); |
| 603 | } |
| 604 | |
| 605 | |
| 606 | void |
| 607 | l2tp_print(const u_char *dat, u_int length) |
| 608 | { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 609 | const u_char *ptr = dat; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 610 | u_int cnt = 0; /* total octets consumed */ |
| 611 | u_int16_t pad; |
| 612 | int flag_t, flag_l, flag_s, flag_o; |
| 613 | u_int16_t l2tp_len; |
| 614 | |
| 615 | flag_t = flag_l = flag_s = flag_o = FALSE; |
| 616 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 617 | TCHECK2(*ptr, 2); /* Flags & Version */ |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 618 | if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2TP) { |
| 619 | printf(" l2tp:"); |
| 620 | } else if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2F) { |
| 621 | printf(" l2f:"); |
| 622 | return; /* nothing to do */ |
| 623 | } else { |
| 624 | printf(" Unknown Version, neither L2F(1) nor L2TP(2)"); |
| 625 | return; /* nothing we can do */ |
| 626 | } |
| 627 | |
| 628 | printf("["); |
| 629 | if (EXTRACT_16BITS(ptr) & L2TP_FLAG_TYPE) { |
| 630 | flag_t = TRUE; |
| 631 | printf("T"); |
| 632 | } |
| 633 | if (EXTRACT_16BITS(ptr) & L2TP_FLAG_LENGTH) { |
| 634 | flag_l = TRUE; |
| 635 | printf("L"); |
| 636 | } |
| 637 | if (EXTRACT_16BITS(ptr) & L2TP_FLAG_SEQUENCE) { |
| 638 | flag_s = TRUE; |
| 639 | printf("S"); |
| 640 | } |
| 641 | if (EXTRACT_16BITS(ptr) & L2TP_FLAG_OFFSET) { |
| 642 | flag_o = TRUE; |
| 643 | printf("O"); |
| 644 | } |
| 645 | if (EXTRACT_16BITS(ptr) & L2TP_FLAG_PRIORITY) |
| 646 | printf("P"); |
| 647 | printf("]"); |
| 648 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 649 | ptr += 2; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 650 | cnt += 2; |
| 651 | |
| 652 | if (flag_l) { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 653 | TCHECK2(*ptr, 2); /* Length */ |
| 654 | l2tp_len = EXTRACT_16BITS(ptr); |
| 655 | ptr += 2; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 656 | cnt += 2; |
| 657 | } else { |
| 658 | l2tp_len = 0; |
| 659 | } |
| 660 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 661 | TCHECK2(*ptr, 2); /* Tunnel ID */ |
| 662 | printf("(%u/", EXTRACT_16BITS(ptr)); |
| 663 | ptr += 2; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 664 | cnt += 2; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 665 | TCHECK2(*ptr, 2); /* Session ID */ |
| 666 | printf("%u)", EXTRACT_16BITS(ptr)); |
| 667 | ptr += 2; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 668 | cnt += 2; |
| 669 | |
| 670 | if (flag_s) { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 671 | TCHECK2(*ptr, 2); /* Ns */ |
| 672 | printf("Ns=%u,", EXTRACT_16BITS(ptr)); |
| 673 | ptr += 2; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 674 | cnt += 2; |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 675 | TCHECK2(*ptr, 2); /* Nr */ |
| 676 | printf("Nr=%u", EXTRACT_16BITS(ptr)); |
| 677 | ptr += 2; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 678 | cnt += 2; |
| 679 | } |
| 680 | |
| 681 | if (flag_o) { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 682 | TCHECK2(*ptr, 2); /* Offset Size */ |
| 683 | pad = EXTRACT_16BITS(ptr); |
| 684 | ptr += (2 + pad); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 685 | cnt += (2 + pad); |
| 686 | } |
| 687 | |
| 688 | if (flag_l) { |
| 689 | if (length < l2tp_len) { |
| 690 | printf(" Length %u larger than packet", l2tp_len); |
| 691 | return; |
| 692 | } |
| 693 | length = l2tp_len; |
| 694 | } |
| 695 | if (length < cnt) { |
| 696 | printf(" Length %u smaller than header length", length); |
| 697 | return; |
| 698 | } |
| 699 | if (flag_t) { |
| 700 | if (!flag_l) { |
| 701 | printf(" No length"); |
| 702 | return; |
| 703 | } |
| 704 | if (length - cnt == 0) { |
| 705 | printf(" ZLB"); |
| 706 | } else { |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 707 | l2tp_avp_print(ptr, length - cnt); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 708 | } |
| 709 | } else { |
| 710 | printf(" {"); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 711 | ppp_print(ptr, length - cnt); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 712 | printf("}"); |
| 713 | } |
| 714 | |
| 715 | return; |
| 716 | |
| 717 | trunc: |
| 718 | printf("%s", tstr); |
| 719 | } |