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_ = 26 "@(#) $Header: /tcpdump/master/tcpdump/print-l2tp.c,v 1.17.2.2 2005/04/20 21:50:16 guy Exp $"; 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 #ifndef TRUE 44 #define TRUE 1 45 #endif 46 47 #ifndef FALSE 48 #define FALSE 0 49 #endif 50 51 #define L2TP_MSGTYPE_SCCRQ 1 /* Start-Control-Connection-Request */ 52 #define L2TP_MSGTYPE_SCCRP 2 /* Start-Control-Connection-Reply */ 53 #define L2TP_MSGTYPE_SCCCN 3 /* Start-Control-Connection-Connected */ 54 #define L2TP_MSGTYPE_STOPCCN 4 /* Stop-Control-Connection-Notification */ 55 #define L2TP_MSGTYPE_HELLO 6 /* Hello */ 56 #define L2TP_MSGTYPE_OCRQ 7 /* Outgoing-Call-Request */ 57 #define L2TP_MSGTYPE_OCRP 8 /* Outgoing-Call-Reply */ 58 #define L2TP_MSGTYPE_OCCN 9 /* Outgoing-Call-Connected */ 59 #define L2TP_MSGTYPE_ICRQ 10 /* Incoming-Call-Request */ 60 #define L2TP_MSGTYPE_ICRP 11 /* Incoming-Call-Reply */ 61 #define L2TP_MSGTYPE_ICCN 12 /* Incoming-Call-Connected */ 62 #define L2TP_MSGTYPE_CDN 14 /* Call-Disconnect-Notify */ 63 #define L2TP_MSGTYPE_WEN 15 /* WAN-Error-Notify */ 64 #define L2TP_MSGTYPE_SLI 16 /* Set-Link-Info */ 65 66 static struct tok l2tp_msgtype2str[] = { 67 { L2TP_MSGTYPE_SCCRQ, "SCCRQ" }, 68 { L2TP_MSGTYPE_SCCRP, "SCCRP" }, 69 { L2TP_MSGTYPE_SCCCN, "SCCCN" }, 70 { L2TP_MSGTYPE_STOPCCN, "StopCCN" }, 71 { L2TP_MSGTYPE_HELLO, "HELLO" }, 72 { L2TP_MSGTYPE_OCRQ, "OCRQ" }, 73 { L2TP_MSGTYPE_OCRP, "OCRP" }, 74 { L2TP_MSGTYPE_OCCN, "OCCN" }, 75 { L2TP_MSGTYPE_ICRQ, "ICRQ" }, 76 { L2TP_MSGTYPE_ICRP, "ICRP" }, 77 { L2TP_MSGTYPE_ICCN, "ICCN" }, 78 { L2TP_MSGTYPE_CDN, "CDN" }, 79 { L2TP_MSGTYPE_WEN, "WEN" }, 80 { L2TP_MSGTYPE_SLI, "SLI" }, 81 { 0, NULL } 82 }; 83 84 #define L2TP_AVP_MSGTYPE 0 /* Message Type */ 85 #define L2TP_AVP_RESULT_CODE 1 /* Result Code */ 86 #define L2TP_AVP_PROTO_VER 2 /* Protocol Version */ 87 #define L2TP_AVP_FRAMING_CAP 3 /* Framing Capabilities */ 88 #define L2TP_AVP_BEARER_CAP 4 /* Bearer Capabilities */ 89 #define L2TP_AVP_TIE_BREAKER 5 /* Tie Breaker */ 90 #define L2TP_AVP_FIRM_VER 6 /* Firmware Revision */ 91 #define L2TP_AVP_HOST_NAME 7 /* Host Name */ 92 #define L2TP_AVP_VENDOR_NAME 8 /* Vendor Name */ 93 #define L2TP_AVP_ASSND_TUN_ID 9 /* Assigned Tunnel ID */ 94 #define L2TP_AVP_RECV_WIN_SIZE 10 /* Receive Window Size */ 95 #define L2TP_AVP_CHALLENGE 11 /* Challenge */ 96 #define L2TP_AVP_Q931_CC 12 /* Q.931 Cause Code */ 97 #define L2TP_AVP_CHALLENGE_RESP 13 /* Challenge Response */ 98 #define L2TP_AVP_ASSND_SESS_ID 14 /* Assigned Session ID */ 99 #define L2TP_AVP_CALL_SER_NUM 15 /* Call Serial Number */ 100 #define L2TP_AVP_MINIMUM_BPS 16 /* Minimum BPS */ 101 #define L2TP_AVP_MAXIMUM_BPS 17 /* Maximum BPS */ 102 #define L2TP_AVP_BEARER_TYPE 18 /* Bearer Type */ 103 #define L2TP_AVP_FRAMING_TYPE 19 /* Framing Type */ 104 #define L2TP_AVP_PACKET_PROC_DELAY 20 /* Packet Processing Delay (OBSOLETE) */ 105 #define L2TP_AVP_CALLED_NUMBER 21 /* Called Number */ 106 #define L2TP_AVP_CALLING_NUMBER 22 /* Calling Number */ 107 #define L2TP_AVP_SUB_ADDRESS 23 /* Sub-Address */ 108 #define L2TP_AVP_TX_CONN_SPEED 24 /* (Tx) Connect Speed */ 109 #define L2TP_AVP_PHY_CHANNEL_ID 25 /* Physical Channel ID */ 110 #define L2TP_AVP_INI_RECV_LCP 26 /* Initial Received LCP CONFREQ */ 111 #define L2TP_AVP_LAST_SENT_LCP 27 /* Last Sent LCP CONFREQ */ 112 #define L2TP_AVP_LAST_RECV_LCP 28 /* Last Received LCP CONFREQ */ 113 #define L2TP_AVP_PROXY_AUTH_TYPE 29 /* Proxy Authen Type */ 114 #define L2TP_AVP_PROXY_AUTH_NAME 30 /* Proxy Authen Name */ 115 #define L2TP_AVP_PROXY_AUTH_CHAL 31 /* Proxy Authen Challenge */ 116 #define L2TP_AVP_PROXY_AUTH_ID 32 /* Proxy Authen ID */ 117 #define L2TP_AVP_PROXY_AUTH_RESP 33 /* Proxy Authen Response */ 118 #define L2TP_AVP_CALL_ERRORS 34 /* Call Errors */ 119 #define L2TP_AVP_ACCM 35 /* ACCM */ 120 #define L2TP_AVP_RANDOM_VECTOR 36 /* Random Vector */ 121 #define L2TP_AVP_PRIVATE_GRP_ID 37 /* Private Group ID */ 122 #define L2TP_AVP_RX_CONN_SPEED 38 /* (Rx) Connect Speed */ 123 #define L2TP_AVP_SEQ_REQUIRED 39 /* Sequencing Required */ 124 #define L2TP_AVP_PPP_DISCON_CC 46 /* PPP Disconnect Cause Code */ 125 126 static struct tok l2tp_avp2str[] = { 127 { L2TP_AVP_MSGTYPE, "MSGTYPE" }, 128 { L2TP_AVP_RESULT_CODE, "RESULT_CODE" }, 129 { L2TP_AVP_PROTO_VER, "PROTO_VER" }, 130 { L2TP_AVP_FRAMING_CAP, "FRAMING_CAP" }, 131 { L2TP_AVP_BEARER_CAP, "BEARER_CAP" }, 132 { L2TP_AVP_TIE_BREAKER, "TIE_BREAKER" }, 133 { L2TP_AVP_FIRM_VER, "FIRM_VER" }, 134 { L2TP_AVP_HOST_NAME, "HOST_NAME" }, 135 { L2TP_AVP_VENDOR_NAME, "VENDOR_NAME" }, 136 { L2TP_AVP_ASSND_TUN_ID, "ASSND_TUN_ID" }, 137 { L2TP_AVP_RECV_WIN_SIZE, "RECV_WIN_SIZE" }, 138 { L2TP_AVP_CHALLENGE, "CHALLENGE" }, 139 { L2TP_AVP_Q931_CC, "Q931_CC", }, 140 { L2TP_AVP_CHALLENGE_RESP, "CHALLENGE_RESP" }, 141 { L2TP_AVP_ASSND_SESS_ID, "ASSND_SESS_ID" }, 142 { L2TP_AVP_CALL_SER_NUM, "CALL_SER_NUM" }, 143 { L2TP_AVP_MINIMUM_BPS, "MINIMUM_BPS" }, 144 { L2TP_AVP_MAXIMUM_BPS, "MAXIMUM_BPS" }, 145 { L2TP_AVP_BEARER_TYPE, "BEARER_TYPE" }, 146 { L2TP_AVP_FRAMING_TYPE, "FRAMING_TYPE" }, 147 { L2TP_AVP_PACKET_PROC_DELAY, "PACKET_PROC_DELAY" }, 148 { L2TP_AVP_CALLED_NUMBER, "CALLED_NUMBER" }, 149 { L2TP_AVP_CALLING_NUMBER, "CALLING_NUMBER" }, 150 { L2TP_AVP_SUB_ADDRESS, "SUB_ADDRESS" }, 151 { L2TP_AVP_TX_CONN_SPEED, "TX_CONN_SPEED" }, 152 { L2TP_AVP_PHY_CHANNEL_ID, "PHY_CHANNEL_ID" }, 153 { L2TP_AVP_INI_RECV_LCP, "INI_RECV_LCP" }, 154 { L2TP_AVP_LAST_SENT_LCP, "LAST_SENT_LCP" }, 155 { L2TP_AVP_LAST_RECV_LCP, "LAST_RECV_LCP" }, 156 { L2TP_AVP_PROXY_AUTH_TYPE, "PROXY_AUTH_TYPE" }, 157 { L2TP_AVP_PROXY_AUTH_NAME, "PROXY_AUTH_NAME" }, 158 { L2TP_AVP_PROXY_AUTH_CHAL, "PROXY_AUTH_CHAL" }, 159 { L2TP_AVP_PROXY_AUTH_ID, "PROXY_AUTH_ID" }, 160 { L2TP_AVP_PROXY_AUTH_RESP, "PROXY_AUTH_RESP" }, 161 { L2TP_AVP_CALL_ERRORS, "CALL_ERRORS" }, 162 { L2TP_AVP_ACCM, "ACCM" }, 163 { L2TP_AVP_RANDOM_VECTOR, "RANDOM_VECTOR" }, 164 { L2TP_AVP_PRIVATE_GRP_ID, "PRIVATE_GRP_ID" }, 165 { L2TP_AVP_RX_CONN_SPEED, "RX_CONN_SPEED" }, 166 { L2TP_AVP_SEQ_REQUIRED, "SEQ_REQUIRED" }, 167 { L2TP_AVP_PPP_DISCON_CC, "PPP_DISCON_CC" }, 168 { 0, NULL } 169 }; 170 171 static struct tok l2tp_authentype2str[] = { 172 { L2TP_AUTHEN_TYPE_RESERVED, "Reserved" }, 173 { L2TP_AUTHEN_TYPE_TEXTUAL, "Textual" }, 174 { L2TP_AUTHEN_TYPE_CHAP, "CHAP" }, 175 { L2TP_AUTHEN_TYPE_PAP, "PAP" }, 176 { L2TP_AUTHEN_TYPE_NO_AUTH, "No Auth" }, 177 { L2TP_AUTHEN_TYPE_MSCHAPv1, "MS-CHAPv1" }, 178 { 0, NULL } 179 }; 180 181 #define L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL 0 182 #define L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER 1 183 #define L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL 2 184 185 static struct tok l2tp_cc_direction2str[] = { 186 { L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL, "global error" }, 187 { L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER, "at peer" }, 188 { L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL,"at local" }, 189 { 0, NULL } 190 }; 191 192 #if 0 193 static char *l2tp_result_code_StopCCN[] = { 194 "Reserved", 195 "General request to clear control connection", 196 "General error--Error Code indicates the problem", 197 "Control channel already exists", 198 "Requester is not authorized to establish a control channel", 199 "The protocol version of the requester is not supported", 200 "Requester is being shut down", 201 "Finite State Machine error" 202 #define L2TP_MAX_RESULT_CODE_STOPCC_INDEX 8 203 }; 204 #endif 205 206 #if 0 207 static char *l2tp_result_code_CDN[] = { 208 "Reserved", 209 "Call disconnected due to loss of carrier", 210 "Call disconnected for the reason indicated in error code", 211 "Call disconnected for administrative reasons", 212 "Call failed due to lack of appropriate facilities being " \ 213 "available (temporary condition)", 214 "Call failed due to lack of appropriate facilities being " \ 215 "available (permanent condition)", 216 "Invalid destination", 217 "Call failed due to no carrier detected", 218 "Call failed due to detection of a busy signal", 219 "Call failed due to lack of a dial tone", 220 "Call was not established within time allotted by LAC", 221 "Call was connected but no appropriate framing was detected" 222 #define L2TP_MAX_RESULT_CODE_CDN_INDEX 12 223 }; 224 #endif 225 226 #if 0 227 static char *l2tp_error_code_general[] = { 228 "No general error", 229 "No control connection exists yet for this LAC-LNS pair", 230 "Length is wrong", 231 "One of the field values was out of range or " \ 232 "reserved field was non-zero" 233 "Insufficient resources to handle this operation now", 234 "The Session ID is invalid in this context", 235 "A generic vendor-specific error occurred in the LAC", 236 "Try another" 237 #define L2TP_MAX_ERROR_CODE_GENERAL_INDEX 8 238 }; 239 #endif 240 241 /******************************/ 242 /* generic print out routines */ 243 /******************************/ 244 static void 245 print_string(const u_char *dat, u_int length) 246 { 247 u_int i; 248 for (i=0; i<length; i++) { 249 printf("%c", *dat++); 250 } 251 } 252 253 static void 254 print_octets(const u_char *dat, u_int length) 255 { 256 u_int i; 257 for (i=0; i<length; i++) { 258 printf("%02x", *dat++); 259 } 260 } 261 262 static void 263 print_16bits_val(const u_int16_t *dat) 264 { 265 printf("%u", EXTRACT_16BITS(dat)); 266 } 267 268 static void 269 print_32bits_val(const u_int32_t *dat) 270 { 271 printf("%lu", (u_long)EXTRACT_32BITS(dat)); 272 } 273 274 /***********************************/ 275 /* AVP-specific print out routines */ 276 /***********************************/ 277 static void 278 l2tp_msgtype_print(const u_char *dat) 279 { 280 u_int16_t *ptr = (u_int16_t*)dat; 281 282 printf("%s", tok2str(l2tp_msgtype2str, "MSGTYPE-#%u", 283 EXTRACT_16BITS(ptr))); 284 } 285 286 static void 287 l2tp_result_code_print(const u_char *dat, u_int length) 288 { 289 u_int16_t *ptr = (u_int16_t *)dat; 290 291 printf("%u", EXTRACT_16BITS(ptr)); ptr++; /* Result Code */ 292 if (length > 2) { /* Error Code (opt) */ 293 printf("/%u", EXTRACT_16BITS(ptr)); ptr++; 294 } 295 if (length > 4) { /* Error Message (opt) */ 296 printf(" "); 297 print_string((u_char *)ptr, length - 4); 298 } 299 } 300 301 static void 302 l2tp_proto_ver_print(const u_int16_t *dat) 303 { 304 printf("%u.%u", (EXTRACT_16BITS(dat) >> 8), 305 (EXTRACT_16BITS(dat) & 0xff)); 306 } 307 308 static void 309 l2tp_framing_cap_print(const u_char *dat) 310 { 311 u_int32_t *ptr = (u_int32_t *)dat; 312 313 if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_CAP_ASYNC_MASK) { 314 printf("A"); 315 } 316 if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_CAP_SYNC_MASK) { 317 printf("S"); 318 } 319 } 320 321 static void 322 l2tp_bearer_cap_print(const u_char *dat) 323 { 324 u_int32_t *ptr = (u_int32_t *)dat; 325 326 if (EXTRACT_32BITS(ptr) & L2TP_BEARER_CAP_ANALOG_MASK) { 327 printf("A"); 328 } 329 if (EXTRACT_32BITS(ptr) & L2TP_BEARER_CAP_DIGITAL_MASK) { 330 printf("D"); 331 } 332 } 333 334 static void 335 l2tp_q931_cc_print(const u_char *dat, u_int length) 336 { 337 print_16bits_val((u_int16_t *)dat); 338 printf(", %02x", dat[2]); 339 if (length > 3) { 340 printf(" "); 341 print_string(dat+3, length-3); 342 } 343 } 344 345 static void 346 l2tp_bearer_type_print(const u_char *dat) 347 { 348 u_int32_t *ptr = (u_int32_t *)dat; 349 350 if (EXTRACT_32BITS(ptr) & L2TP_BEARER_TYPE_ANALOG_MASK) { 351 printf("A"); 352 } 353 if (EXTRACT_32BITS(ptr) & L2TP_BEARER_TYPE_DIGITAL_MASK) { 354 printf("D"); 355 } 356 } 357 358 static void 359 l2tp_framing_type_print(const u_char *dat) 360 { 361 u_int32_t *ptr = (u_int32_t *)dat; 362 363 if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_TYPE_ASYNC_MASK) { 364 printf("A"); 365 } 366 if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_TYPE_SYNC_MASK) { 367 printf("S"); 368 } 369 } 370 371 static void 372 l2tp_packet_proc_delay_print(void) 373 { 374 printf("obsolete"); 375 } 376 377 static void 378 l2tp_proxy_auth_type_print(const u_char *dat) 379 { 380 u_int16_t *ptr = (u_int16_t *)dat; 381 382 printf("%s", tok2str(l2tp_authentype2str, 383 "AuthType-#%u", EXTRACT_16BITS(ptr))); 384 } 385 386 static void 387 l2tp_proxy_auth_id_print(const u_char *dat) 388 { 389 u_int16_t *ptr = (u_int16_t *)dat; 390 391 printf("%u", EXTRACT_16BITS(ptr) & L2TP_PROXY_AUTH_ID_MASK); 392 } 393 394 static void 395 l2tp_call_errors_print(const u_char *dat) 396 { 397 u_int16_t *ptr = (u_int16_t *)dat; 398 u_int16_t val_h, val_l; 399 400 ptr++; /* skip "Reserved" */ 401 402 val_h = EXTRACT_16BITS(ptr); ptr++; 403 val_l = EXTRACT_16BITS(ptr); ptr++; 404 printf("CRCErr=%u ", (val_h<<16) + val_l); 405 406 val_h = EXTRACT_16BITS(ptr); ptr++; 407 val_l = EXTRACT_16BITS(ptr); ptr++; 408 printf("FrameErr=%u ", (val_h<<16) + val_l); 409 410 val_h = EXTRACT_16BITS(ptr); ptr++; 411 val_l = EXTRACT_16BITS(ptr); ptr++; 412 printf("HardOver=%u ", (val_h<<16) + val_l); 413 414 val_h = EXTRACT_16BITS(ptr); ptr++; 415 val_l = EXTRACT_16BITS(ptr); ptr++; 416 printf("BufOver=%u ", (val_h<<16) + val_l); 417 418 val_h = EXTRACT_16BITS(ptr); ptr++; 419 val_l = EXTRACT_16BITS(ptr); ptr++; 420 printf("Timeout=%u ", (val_h<<16) + val_l); 421 422 val_h = EXTRACT_16BITS(ptr); ptr++; 423 val_l = EXTRACT_16BITS(ptr); ptr++; 424 printf("AlignErr=%u ", (val_h<<16) + val_l); 425 } 426 427 static void 428 l2tp_accm_print(const u_char *dat) 429 { 430 u_int16_t *ptr = (u_int16_t *)dat; 431 u_int16_t val_h, val_l; 432 433 ptr++; /* skip "Reserved" */ 434 435 val_h = EXTRACT_16BITS(ptr); ptr++; 436 val_l = EXTRACT_16BITS(ptr); ptr++; 437 printf("send=%08x ", (val_h<<16) + val_l); 438 439 val_h = EXTRACT_16BITS(ptr); ptr++; 440 val_l = EXTRACT_16BITS(ptr); ptr++; 441 printf("recv=%08x ", (val_h<<16) + val_l); 442 } 443 444 static void 445 l2tp_ppp_discon_cc_print(const u_char *dat, u_int length) 446 { 447 u_int16_t *ptr = (u_int16_t *)dat; 448 449 printf("%04x, ", EXTRACT_16BITS(ptr)); ptr++; /* Disconnect Code */ 450 printf("%04x ", EXTRACT_16BITS(ptr)); ptr++; /* Control Protocol Number */ 451 printf("%s", tok2str(l2tp_cc_direction2str, 452 "Direction-#%u", *((u_char *)ptr++))); 453 454 if (length > 5) { 455 printf(" "); 456 print_string((const u_char *)ptr, length-5); 457 } 458 } 459 460 static void 461 l2tp_avp_print(const u_char *dat, int length) 462 { 463 u_int len; 464 const u_int16_t *ptr = (u_int16_t *)dat; 465 u_int16_t attr_type; 466 int hidden = FALSE; 467 468 if (length <= 0) { 469 return; 470 } 471 472 printf(" "); 473 474 TCHECK(*ptr); /* Flags & Length */ 475 len = EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_LEN_MASK; 476 477 /* If it is not long enough to contain the header, we'll give up. */ 478 if (len < 6) 479 goto trunc; 480 481 /* If it goes past the end of the remaining length of the packet, 482 we'll give up. */ 483 if (len > (u_int)length) 484 goto trunc; 485 486 /* If it goes past the end of the remaining length of the captured 487 data, we'll give up. */ 488 TCHECK2(*ptr, len); 489 /* After this point, no need to worry about truncation */ 490 491 if (EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_FLAG_MANDATORY) { 492 printf("*"); 493 } 494 if (EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_FLAG_HIDDEN) { 495 hidden = TRUE; 496 printf("?"); 497 } 498 ptr++; 499 500 if (EXTRACT_16BITS(ptr)) { 501 /* Vendor Specific Attribute */ 502 printf("VENDOR%04x:", EXTRACT_16BITS(ptr)); ptr++; 503 printf("ATTR%04x", EXTRACT_16BITS(ptr)); ptr++; 504 printf("("); 505 print_octets((u_char *)ptr, len-6); 506 printf(")"); 507 } else { 508 /* IETF-defined Attributes */ 509 ptr++; 510 attr_type = EXTRACT_16BITS(ptr); ptr++; 511 printf("%s", tok2str(l2tp_avp2str, "AVP-#%u", attr_type)); 512 printf("("); 513 if (hidden) { 514 printf("???"); 515 } else { 516 switch (attr_type) { 517 case L2TP_AVP_MSGTYPE: 518 l2tp_msgtype_print((u_char *)ptr); 519 break; 520 case L2TP_AVP_RESULT_CODE: 521 l2tp_result_code_print((u_char *)ptr, len-6); 522 break; 523 case L2TP_AVP_PROTO_VER: 524 l2tp_proto_ver_print(ptr); 525 break; 526 case L2TP_AVP_FRAMING_CAP: 527 l2tp_framing_cap_print((u_char *)ptr); 528 break; 529 case L2TP_AVP_BEARER_CAP: 530 l2tp_bearer_cap_print((u_char *)ptr); 531 break; 532 case L2TP_AVP_TIE_BREAKER: 533 print_octets((u_char *)ptr, 8); 534 break; 535 case L2TP_AVP_FIRM_VER: 536 case L2TP_AVP_ASSND_TUN_ID: 537 case L2TP_AVP_RECV_WIN_SIZE: 538 case L2TP_AVP_ASSND_SESS_ID: 539 print_16bits_val(ptr); 540 break; 541 case L2TP_AVP_HOST_NAME: 542 case L2TP_AVP_VENDOR_NAME: 543 case L2TP_AVP_CALLING_NUMBER: 544 case L2TP_AVP_CALLED_NUMBER: 545 case L2TP_AVP_SUB_ADDRESS: 546 case L2TP_AVP_PROXY_AUTH_NAME: 547 case L2TP_AVP_PRIVATE_GRP_ID: 548 print_string((u_char *)ptr, len-6); 549 break; 550 case L2TP_AVP_CHALLENGE: 551 case L2TP_AVP_INI_RECV_LCP: 552 case L2TP_AVP_LAST_SENT_LCP: 553 case L2TP_AVP_LAST_RECV_LCP: 554 case L2TP_AVP_PROXY_AUTH_CHAL: 555 case L2TP_AVP_PROXY_AUTH_RESP: 556 case L2TP_AVP_RANDOM_VECTOR: 557 print_octets((u_char *)ptr, len-6); 558 break; 559 case L2TP_AVP_Q931_CC: 560 l2tp_q931_cc_print((u_char *)ptr, len-6); 561 break; 562 case L2TP_AVP_CHALLENGE_RESP: 563 print_octets((u_char *)ptr, 16); 564 break; 565 case L2TP_AVP_CALL_SER_NUM: 566 case L2TP_AVP_MINIMUM_BPS: 567 case L2TP_AVP_MAXIMUM_BPS: 568 case L2TP_AVP_TX_CONN_SPEED: 569 case L2TP_AVP_PHY_CHANNEL_ID: 570 case L2TP_AVP_RX_CONN_SPEED: 571 print_32bits_val((u_int32_t *)ptr); 572 break; 573 case L2TP_AVP_BEARER_TYPE: 574 l2tp_bearer_type_print((u_char *)ptr); 575 break; 576 case L2TP_AVP_FRAMING_TYPE: 577 l2tp_framing_type_print((u_char *)ptr); 578 break; 579 case L2TP_AVP_PACKET_PROC_DELAY: 580 l2tp_packet_proc_delay_print(); 581 break; 582 case L2TP_AVP_PROXY_AUTH_TYPE: 583 l2tp_proxy_auth_type_print((u_char *)ptr); 584 break; 585 case L2TP_AVP_PROXY_AUTH_ID: 586 l2tp_proxy_auth_id_print((u_char *)ptr); 587 break; 588 case L2TP_AVP_CALL_ERRORS: 589 l2tp_call_errors_print((u_char *)ptr); 590 break; 591 case L2TP_AVP_ACCM: 592 l2tp_accm_print((u_char *)ptr); 593 break; 594 case L2TP_AVP_SEQ_REQUIRED: 595 break; /* No Attribute Value */ 596 case L2TP_AVP_PPP_DISCON_CC: 597 l2tp_ppp_discon_cc_print((u_char *)ptr, len-6); 598 break; 599 default: 600 break; 601 } 602 } 603 printf(")"); 604 } 605 606 l2tp_avp_print(dat+len, length-len); 607 return; 608 609 trunc: 610 printf("|..."); 611 } 612 613 614 void 615 l2tp_print(const u_char *dat, u_int length) 616 { 617 const u_int16_t *ptr = (u_int16_t *)dat; 618 u_int cnt = 0; /* total octets consumed */ 619 u_int16_t pad; 620 int flag_t, flag_l, flag_s, flag_o; 621 u_int16_t l2tp_len; 622 623 flag_t = flag_l = flag_s = flag_o = FALSE; 624 625 TCHECK(*ptr); /* Flags & Version */ 626 if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2TP) { 627 printf(" l2tp:"); 628 } else if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2F) { 629 printf(" l2f:"); 630 return; /* nothing to do */ 631 } else { 632 printf(" Unknown Version, neither L2F(1) nor L2TP(2)"); 633 return; /* nothing we can do */ 634 } 635 636 printf("["); 637 if (EXTRACT_16BITS(ptr) & L2TP_FLAG_TYPE) { 638 flag_t = TRUE; 639 printf("T"); 640 } 641 if (EXTRACT_16BITS(ptr) & L2TP_FLAG_LENGTH) { 642 flag_l = TRUE; 643 printf("L"); 644 } 645 if (EXTRACT_16BITS(ptr) & L2TP_FLAG_SEQUENCE) { 646 flag_s = TRUE; 647 printf("S"); 648 } 649 if (EXTRACT_16BITS(ptr) & L2TP_FLAG_OFFSET) { 650 flag_o = TRUE; 651 printf("O"); 652 } 653 if (EXTRACT_16BITS(ptr) & L2TP_FLAG_PRIORITY) 654 printf("P"); 655 printf("]"); 656 657 ptr++; 658 cnt += 2; 659 660 if (flag_l) { 661 TCHECK(*ptr); /* Length */ 662 l2tp_len = EXTRACT_16BITS(ptr); ptr++; 663 cnt += 2; 664 } else { 665 l2tp_len = 0; 666 } 667 668 TCHECK(*ptr); /* Tunnel ID */ 669 printf("(%u/", EXTRACT_16BITS(ptr)); ptr++; 670 cnt += 2; 671 TCHECK(*ptr); /* Session ID */ 672 printf("%u)", EXTRACT_16BITS(ptr)); ptr++; 673 cnt += 2; 674 675 if (flag_s) { 676 TCHECK(*ptr); /* Ns */ 677 printf("Ns=%u,", EXTRACT_16BITS(ptr)); ptr++; 678 cnt += 2; 679 TCHECK(*ptr); /* Nr */ 680 printf("Nr=%u", EXTRACT_16BITS(ptr)); ptr++; 681 cnt += 2; 682 } 683 684 if (flag_o) { 685 TCHECK(*ptr); /* Offset Size */ 686 pad = EXTRACT_16BITS(ptr); ptr++; 687 ptr += pad / sizeof(*ptr); 688 cnt += (2 + pad); 689 } 690 691 if (flag_l) { 692 if (length < l2tp_len) { 693 printf(" Length %u larger than packet", l2tp_len); 694 return; 695 } 696 length = l2tp_len; 697 } 698 if (length < cnt) { 699 printf(" Length %u smaller than header length", length); 700 return; 701 } 702 if (flag_t) { 703 if (!flag_l) { 704 printf(" No length"); 705 return; 706 } 707 if (length - cnt == 0) { 708 printf(" ZLB"); 709 } else { 710 l2tp_avp_print((u_char *)ptr, length - cnt); 711 } 712 } else { 713 printf(" {"); 714 ppp_print((u_char *)ptr, length - cnt); 715 printf("}"); 716 } 717 718 return; 719 720 trunc: 721 printf("%s", tstr); 722 } 723