1 /* 2 * Copyright (c) 1990, 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 * Extensively modified by Motonori Shindo (mshindo@mshindo.net) for more 22 * complete PPP support. 23 * 24 * $FreeBSD$ 25 */ 26 27 /* 28 * TODO: 29 * o resolve XXX as much as possible 30 * o MP support 31 * o BAP support 32 */ 33 34 #ifndef lint 35 static const char rcsid[] _U_ = 36 "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.89.2.3 2004/03/24 03:32:43 guy Exp $ (LBL)"; 37 #endif 38 39 #ifdef HAVE_CONFIG_H 40 #include "config.h" 41 #endif 42 43 #include <tcpdump-stdinc.h> 44 45 #ifdef __bsdi__ 46 #include <net/slcompress.h> 47 #include <net/if_ppp.h> 48 #endif 49 50 #include <pcap.h> 51 #include <stdio.h> 52 53 #include "interface.h" 54 #include "extract.h" 55 #include "addrtoname.h" 56 #include "ppp.h" 57 #include "chdlc.h" 58 #include "ethertype.h" 59 60 /* 61 * The following constatns are defined by IANA. Please refer to 62 * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers 63 * for the up-to-date information. 64 */ 65 66 /* Protocol Codes defined in ppp.h */ 67 68 struct tok ppptype2str[] = { 69 { PPP_IP, "IP" }, 70 { PPP_OSI, "OSI" }, 71 { PPP_NS, "NS" }, 72 { PPP_DECNET, "DECNET" }, 73 { PPP_APPLE, "APPLE" }, 74 { PPP_IPX, "IPX" }, 75 { PPP_VJC, "VJC" }, 76 { PPP_VJNC, "VJNC" }, 77 { PPP_BRPDU, "BRPDU" }, 78 { PPP_STII, "STII" }, 79 { PPP_VINES, "VINES" }, 80 { PPP_MPLS_UCAST, "MPLS" }, 81 { PPP_MPLS_MCAST, "MPLS" }, 82 83 { PPP_HELLO, "HELLO" }, 84 { PPP_LUXCOM, "LUXCOM" }, 85 { PPP_SNS, "SNS" }, 86 { PPP_IPCP, "IPCP" }, 87 { PPP_OSICP, "OSICP" }, 88 { PPP_NSCP, "NSCP" }, 89 { PPP_DECNETCP, "DECNETCP" }, 90 { PPP_APPLECP, "APPLECP" }, 91 { PPP_IPXCP, "IPXCP" }, 92 { PPP_STIICP, "STIICP" }, 93 { PPP_VINESCP, "VINESCP" }, 94 { PPP_MPLSCP, "MPLSCP" }, 95 96 { PPP_LCP, "LCP" }, 97 { PPP_PAP, "PAP" }, 98 { PPP_LQM, "LQM" }, 99 { PPP_CHAP, "CHAP" }, 100 { PPP_BACP, "BACP" }, 101 { PPP_BAP, "BAP" }, 102 { PPP_MP, "ML" }, 103 { 0, NULL } 104 }; 105 106 /* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */ 107 108 #define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */ 109 #define CPCODES_CONF_REQ 1 /* Configure-Request */ 110 #define CPCODES_CONF_ACK 2 /* Configure-Ack */ 111 #define CPCODES_CONF_NAK 3 /* Configure-Nak */ 112 #define CPCODES_CONF_REJ 4 /* Configure-Reject */ 113 #define CPCODES_TERM_REQ 5 /* Terminate-Request */ 114 #define CPCODES_TERM_ACK 6 /* Terminate-Ack */ 115 #define CPCODES_CODE_REJ 7 /* Code-Reject */ 116 #define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */ 117 #define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */ 118 #define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */ 119 #define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */ 120 #define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */ 121 #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */ 122 #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */ 123 #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */ 124 125 struct tok cpcodes[] = { 126 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */ 127 {CPCODES_CONF_REQ, "Conf-Request"}, 128 {CPCODES_CONF_ACK, "Conf-Ack"}, 129 {CPCODES_CONF_NAK, "Conf-Nack"}, 130 {CPCODES_CONF_REJ, "Conf-Reject"}, 131 {CPCODES_TERM_REQ, "Term-Request"}, 132 {CPCODES_TERM_ACK, "Term-Ack"}, 133 {CPCODES_CODE_REJ, "Code-Reject"}, 134 {CPCODES_PROT_REJ, "Prot-Reject"}, 135 {CPCODES_ECHO_REQ, "Echo-Request"}, 136 {CPCODES_ECHO_RPL, "Echo-Reply"}, 137 {CPCODES_DISC_REQ, "Disc-Req"}, 138 {CPCODES_ID, "Ident"}, /* RFC1570 */ 139 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */ 140 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */ 141 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */ 142 {0, NULL} 143 }; 144 145 /* LCP Config Options */ 146 147 #define LCPOPT_VEXT 0 148 #define LCPOPT_MRU 1 149 #define LCPOPT_ACCM 2 150 #define LCPOPT_AP 3 151 #define LCPOPT_QP 4 152 #define LCPOPT_MN 5 153 #define LCPOPT_DEP6 6 154 #define LCPOPT_PFC 7 155 #define LCPOPT_ACFC 8 156 #define LCPOPT_FCSALT 9 157 #define LCPOPT_SDP 10 158 #define LCPOPT_NUMMODE 11 159 #define LCPOPT_DEP12 12 160 #define LCPOPT_CBACK 13 161 #define LCPOPT_DEP14 14 162 #define LCPOPT_DEP15 15 163 #define LCPOPT_DEP16 16 164 #define LCPOPT_MLMRRU 17 165 #define LCPOPT_MLSSNHF 18 166 #define LCPOPT_MLED 19 167 #define LCPOPT_PROP 20 168 #define LCPOPT_DCEID 21 169 #define LCPOPT_MPP 22 170 #define LCPOPT_LD 23 171 #define LCPOPT_LCPAOPT 24 172 #define LCPOPT_COBS 25 173 #define LCPOPT_PE 26 174 #define LCPOPT_MLHF 27 175 #define LCPOPT_I18N 28 176 #define LCPOPT_SDLOS 29 177 #define LCPOPT_PPPMUX 30 178 179 #define LCPOPT_MIN LCPOPT_VEXT 180 #define LCPOPT_MAX LCPOPT_PPPMUX 181 182 static const char *lcpconfopts[] = { 183 "Vend-Ext", /* (0) */ 184 "MRU", /* (1) */ 185 "ACCM", /* (2) */ 186 "Auth-Prot", /* (3) */ 187 "Qual-Prot", /* (4) */ 188 "Magic-Num", /* (5) */ 189 "deprecated(6)", /* used to be a Quality Protocol */ 190 "PFC", /* (7) */ 191 "ACFC", /* (8) */ 192 "FCS-Alt", /* (9) */ 193 "SDP", /* (10) */ 194 "Num-Mode", /* (11) */ 195 "deprecated(12)", /* used to be a Multi-Link-Procedure*/ 196 "Call-Back", /* (13) */ 197 "deprecated(14)", /* used to be a Connect-Time */ 198 "deprecated(15)", /* used to be a Compund-Frames */ 199 "deprecated(16)", /* used to be a Nominal-Data-Encap */ 200 "MRRU", /* (17) */ 201 "SSNHF", /* (18) */ 202 "End-Disc", /* (19) */ 203 "Proprietary", /* (20) */ 204 "DCE-Id", /* (21) */ 205 "MP+", /* (22) */ 206 "Link-Disc", /* (23) */ 207 "LCP-Auth-Opt", /* (24) */ 208 "COBS", /* (25) */ 209 "Prefix-elision", /* (26) */ 210 "Multilink-header-Form",/* (27) */ 211 "I18N", /* (28) */ 212 "SDL-over-SONET/SDH", /* (29) */ 213 "PPP-Muxing", /* (30) */ 214 }; 215 216 /* IPV6CP - to be supported */ 217 /* ECP - to be supported */ 218 219 /* CCP Config Options */ 220 221 #define CCPOPT_OUI 0 /* RFC1962 */ 222 #define CCPOPT_PRED1 1 /* RFC1962 */ 223 #define CCPOPT_PRED2 2 /* RFC1962 */ 224 #define CCPOPT_PJUMP 3 /* RFC1962 */ 225 /* 4-15 unassigned */ 226 #define CCPOPT_HPPPC 16 /* RFC1962 */ 227 #define CCPOPT_STACLZS 17 /* RFC1974 */ 228 #define CCPOPT_MPPC 18 /* RFC2118 */ 229 #define CCPOPT_GFZA 19 /* RFC1962 */ 230 #define CCPOPT_V42BIS 20 /* RFC1962 */ 231 #define CCPOPT_BSDCOMP 21 /* RFC1977 */ 232 /* 22 unassigned */ 233 #define CCPOPT_LZSDCP 23 /* RFC1967 */ 234 #define CCPOPT_MVRCA 24 /* RFC1975 */ 235 #define CCPOPT_DEC 25 /* RFC1976 */ 236 #define CCPOPT_DEFLATE 26 /* RFC1979 */ 237 /* 27-254 unassigned */ 238 #define CCPOPT_RESV 255 /* RFC1962 */ 239 240 #define CCPOPT_MIN CCPOPT_OUI 241 #define CCPOPT_MAX CCPOPT_DEFLATE /* XXX: should be CCPOPT_RESV but... */ 242 243 static const char *ccpconfopts[] = { 244 "OUI", /* (0) */ 245 "Pred-1", /* (1) */ 246 "Pred-2", /* (2) */ 247 "Puddle", /* (3) */ 248 "unassigned(4)", /* (4) */ 249 "unassigned(5)", /* (5) */ 250 "unassigned(6)", /* (6) */ 251 "unassigned(7)", /* (7) */ 252 "unassigned(8)", /* (8) */ 253 "unassigned(9)", /* (9) */ 254 "unassigned(10)", /* (10) */ 255 "unassigned(11)", /* (11) */ 256 "unassigned(12)", /* (12) */ 257 "unassigned(13)", /* (13) */ 258 "unassigned(14)", /* (14) */ 259 "unassigned(15)", /* (15) */ 260 "HP-PPC", /* (16) */ 261 "Stac-LZS", /* (17) */ 262 "MPPC", /* (18) */ 263 "Gand-FZA", /* (19) */ 264 "V.42bis", /* (20) */ 265 "BSD-Comp", /* (21) */ 266 "unassigned(22)", /* (22) */ 267 "LZS-DCP", /* (23) */ 268 "MVRCA", /* (24) */ 269 "DEC", /* (25) */ 270 "Deflate", /* (26) */ 271 }; 272 273 /* BACP Config Options */ 274 275 #define BACPOPT_FPEER 1 /* RFC2125 */ 276 277 /* SDCP - to be supported */ 278 279 /* IPCP Config Options */ 280 281 #define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */ 282 #define IPCPOPT_IPCOMP 2 /* RFC1332 */ 283 #define IPCPOPT_ADDR 3 /* RFC1332 */ 284 #define IPCPOPT_MOBILE4 4 /* RFC2290 */ 285 286 #define IPCPOPT_PRIDNS 129 /* RFC1877 */ 287 #define IPCPOPT_PRINBNS 130 /* RFC1877 */ 288 #define IPCPOPT_SECDNS 131 /* RFC1877 */ 289 #define IPCPOPT_SECNBNS 132 /* RFC1877 */ 290 291 /* ATCP - to be supported */ 292 /* OSINLCP - to be supported */ 293 /* BVCP - to be supported */ 294 /* BCP - to be supported */ 295 /* IPXCP - to be supported */ 296 /* MPLSCP - to be supported */ 297 298 /* Auth Algorithms */ 299 300 /* 0-4 Reserved (RFC1994) */ 301 #define AUTHALG_CHAPMD5 5 /* RFC1994 */ 302 #define AUTHALG_MSCHAP1 128 /* RFC2433 */ 303 #define AUTHALG_MSCHAP2 129 /* RFC2795 */ 304 305 /* FCS Alternatives - to be supported */ 306 307 /* Multilink Endpoint Discriminator (RFC1717) */ 308 #define MEDCLASS_NULL 0 /* Null Class */ 309 #define MEDCLASS_LOCAL 1 /* Locally Assigned */ 310 #define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */ 311 #define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */ 312 #define MEDCLASS_MNB 4 /* PPP Magic Number Block */ 313 #define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */ 314 315 /* PPP LCP Callback */ 316 #define CALLBACK_AUTH 0 /* Location determined by user auth */ 317 #define CALLBACK_DSTR 1 /* Dialing string */ 318 #define CALLBACK_LID 2 /* Location identifier */ 319 #define CALLBACK_E164 3 /* E.164 number */ 320 #define CALLBACK_X500 4 /* X.500 distinguished name */ 321 #define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */ 322 323 /* CHAP */ 324 325 #define CHAP_CHAL 1 326 #define CHAP_RESP 2 327 #define CHAP_SUCC 3 328 #define CHAP_FAIL 4 329 330 #define CHAP_CODEMIN CHAP_CHAL 331 #define CHAP_CODEMAX CHAP_FAIL 332 333 static const char *chapcode[] = { 334 "Chal", /* (1) */ 335 "Resp", /* (2) */ 336 "Succ", /* (3) */ 337 "Fail", /* (4) */ 338 }; 339 340 /* PAP */ 341 342 #define PAP_AREQ 1 343 #define PAP_AACK 2 344 #define PAP_ANAK 3 345 346 #define PAP_CODEMIN PAP_AREQ 347 #define PAP_CODEMAX PAP_ANAK 348 349 static const char *papcode[] = { 350 "Auth-Req", /* (1) */ 351 "Auth-Ack", /* (2) */ 352 "Auth-Nak", /* (3) */ 353 }; 354 355 /* BAP */ 356 #define BAP_CALLREQ 1 357 #define BAP_CALLRES 2 358 #define BAP_CBREQ 3 359 #define BAP_CBRES 4 360 #define BAP_LDQREQ 5 361 #define BAP_LDQRES 6 362 #define BAP_CSIND 7 363 #define BAP_CSRES 8 364 365 static void handle_ctrl_proto (u_int proto,const u_char *p, int length); 366 static void handle_chap (const u_char *p, int length); 367 static void handle_pap (const u_char *p, int length); 368 static void handle_bap (const u_char *p, int length); 369 static int print_lcp_config_options (const u_char *p, int); 370 static int print_ipcp_config_options (const u_char *p, int); 371 static int print_ccp_config_options (const u_char *p, int); 372 static int print_bacp_config_options (const u_char *p, int); 373 static void handle_ppp (u_int proto, const u_char *p, int length); 374 375 /* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */ 376 static void 377 handle_ctrl_proto(u_int proto, const u_char *pptr, int length) 378 { 379 const char *typestr; 380 u_int code, len; 381 int (*pfunc)(const u_char *, int); 382 int x, j; 383 const u_char *tptr; 384 385 tptr=pptr; 386 387 typestr = tok2str(ppptype2str, "unknown", proto); 388 printf("%s, ",typestr); 389 390 if (length < 4) /* FIXME weak boundary checking */ 391 goto trunc; 392 TCHECK2(*tptr, 2); 393 394 code = *tptr++; 395 396 printf("%s (0x%02x), id %u", 397 tok2str(cpcodes, "Unknown Opcode",code), 398 code, 399 *tptr++); /* ID */ 400 401 TCHECK2(*tptr, 2); 402 len = EXTRACT_16BITS(tptr); 403 tptr += 2; 404 405 if (length <= 4) 406 return; /* there may be a NULL confreq etc. */ 407 408 switch (code) { 409 case CPCODES_VEXT: 410 if (length < 11) 411 break; 412 TCHECK2(*tptr, 4); 413 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 414 tptr += 4; 415 TCHECK2(*tptr, 3); 416 printf(" OUI 0x%06x", EXTRACT_24BITS(tptr)); 417 /* XXX: need to decode Kind and Value(s)? */ 418 break; 419 case CPCODES_CONF_REQ: 420 case CPCODES_CONF_ACK: 421 case CPCODES_CONF_NAK: 422 case CPCODES_CONF_REJ: 423 x = len - 4; /* Code(1), Identifier(1) and Length(2) */ 424 do { 425 switch (proto) { 426 case PPP_LCP: 427 pfunc = print_lcp_config_options; 428 break; 429 case PPP_IPCP: 430 pfunc = print_ipcp_config_options; 431 break; 432 case PPP_CCP: 433 pfunc = print_ccp_config_options; 434 break; 435 case PPP_BACP: 436 pfunc = print_bacp_config_options; 437 break; 438 default: 439 /* 440 * This should never happen, but we set 441 * "pfunc" to squelch uninitialized 442 * variable warnings from compilers. 443 */ 444 pfunc = NULL; 445 break; 446 } 447 if ((j = (*pfunc)(tptr, len)) == 0) 448 break; 449 x -= j; 450 tptr += j; 451 } while (x > 0); 452 break; 453 454 case CPCODES_TERM_REQ: 455 case CPCODES_TERM_ACK: 456 /* XXX: need to decode Data? */ 457 break; 458 case CPCODES_CODE_REJ: 459 /* XXX: need to decode Rejected-Packet? */ 460 break; 461 case CPCODES_PROT_REJ: 462 if (length < 6) 463 break; 464 TCHECK2(*tptr, 2); 465 printf(", Rejected %s Protocol (0x%04x)", 466 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)), 467 EXTRACT_16BITS(tptr)); 468 /* XXX: need to decode Rejected-Information? */ 469 break; 470 case CPCODES_ECHO_REQ: 471 case CPCODES_ECHO_RPL: 472 case CPCODES_DISC_REQ: 473 case CPCODES_ID: 474 if (length < 8) 475 break; 476 TCHECK2(*tptr, 4); 477 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 478 /* XXX: need to decode Data? */ 479 break; 480 case CPCODES_TIME_REM: 481 if (length < 12) 482 break; 483 TCHECK2(*tptr, 4); 484 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 485 TCHECK2(*(tptr + 4), 4); 486 printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4)); 487 /* XXX: need to decode Message? */ 488 break; 489 default: 490 /* XXX this is dirty but we do not get the 491 * original pointer passed to the begin 492 * the PPP packet */ 493 if (vflag <= 1) 494 print_unknown_data(pptr-2,"\n\t",length+2); 495 break; 496 } 497 printf(", length %u", length); 498 499 if (vflag >1) 500 print_unknown_data(pptr-2,"\n\t",length+2); 501 return; 502 503 trunc: 504 printf("[|%s]", typestr); 505 } 506 507 /* LCP config options */ 508 static int 509 print_lcp_config_options(const u_char *p, int length) 510 { 511 int len, opt; 512 513 if (length < 2) 514 return 0; 515 TCHECK2(*p, 2); 516 len = p[1]; 517 opt = p[0]; 518 if (length < len) 519 return 0; 520 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) 521 printf(", %s ", lcpconfopts[opt]); 522 else { 523 printf(", unknown LCP option 0x%02x", opt); 524 return len; 525 } 526 527 switch (opt) { 528 case LCPOPT_VEXT: 529 if (len >= 6) { 530 TCHECK2(*(p + 2), 3); 531 printf(" OUI 0x%06x", EXTRACT_24BITS(p+2)); 532 #if 0 533 TCHECK(p[5]); 534 printf(" kind 0x%02x", p[5]); 535 printf(" val 0x") 536 for (i = 0; i < len - 6; i++) { 537 TCHECK(p[6 + i]); 538 printf("%02x", p[6 + i]); 539 } 540 #endif 541 } 542 break; 543 case LCPOPT_MRU: 544 if (len == 4) { 545 TCHECK2(*(p + 2), 2); 546 printf(" %u", EXTRACT_16BITS(p + 2)); 547 } 548 break; 549 case LCPOPT_ACCM: 550 if (len == 6) { 551 TCHECK2(*(p + 2), 4); 552 printf(" %08x", EXTRACT_32BITS(p + 2)); 553 } 554 break; 555 case LCPOPT_AP: 556 if (len >= 4) { 557 TCHECK2(*(p + 2), 2); 558 switch (EXTRACT_16BITS(p+2)) { 559 case PPP_PAP: 560 printf(" PAP"); 561 break; 562 case PPP_CHAP: 563 printf(" CHAP"); 564 TCHECK(p[4]); 565 switch (p[4]) { 566 default: 567 printf(", unknown-algorithm-%u", p[4]); 568 break; 569 case AUTHALG_CHAPMD5: 570 printf(", MD5"); 571 break; 572 case AUTHALG_MSCHAP1: 573 printf(", MSCHAPv1"); 574 break; 575 case AUTHALG_MSCHAP2: 576 printf(", MSCHAPv2"); 577 break; 578 } 579 break; 580 case PPP_EAP: 581 printf(" EAP"); 582 break; 583 case PPP_SPAP: 584 printf(" SPAP"); 585 break; 586 case PPP_SPAP_OLD: 587 printf(" Old-SPAP"); 588 break; 589 default: 590 printf("unknown"); 591 } 592 } 593 break; 594 case LCPOPT_QP: 595 if (len >= 4) { 596 TCHECK2(*(p + 2), 2); 597 if (EXTRACT_16BITS(p+2) == PPP_LQM) 598 printf(" LQR"); 599 else 600 printf(" unknown"); 601 } 602 break; 603 case LCPOPT_MN: 604 if (len == 6) { 605 TCHECK2(*(p + 2), 4); 606 printf(" 0x%08x", EXTRACT_32BITS(p + 2)); 607 } 608 break; 609 case LCPOPT_PFC: 610 break; 611 case LCPOPT_ACFC: 612 break; 613 case LCPOPT_LD: 614 if (len == 4) { 615 TCHECK2(*(p + 2), 2); 616 printf(" 0x%04x", EXTRACT_16BITS(p + 2)); 617 } 618 break; 619 case LCPOPT_CBACK: 620 if (len < 3) 621 break; 622 TCHECK(p[2]); 623 switch (p[2]) { /* Operation */ 624 case CALLBACK_AUTH: 625 printf(" UserAuth"); 626 break; 627 case CALLBACK_DSTR: 628 printf(" DialString"); 629 break; 630 case CALLBACK_LID: 631 printf(" LocalID"); 632 break; 633 case CALLBACK_E164: 634 printf(" E.164"); 635 break; 636 case CALLBACK_X500: 637 printf(" X.500"); 638 break; 639 case CALLBACK_CBCP: 640 printf(" CBCP"); 641 break; 642 default: 643 printf(" unknown-operation=%u", p[2]); 644 break; 645 } 646 break; 647 case LCPOPT_MLMRRU: 648 if (len == 4) { 649 TCHECK2(*(p + 2), 2); 650 printf(" %u", EXTRACT_16BITS(p + 2)); 651 } 652 break; 653 case LCPOPT_MLED: 654 if (len < 3) 655 break; 656 TCHECK(p[2]); 657 switch (p[2]) { /* class */ 658 case MEDCLASS_NULL: 659 printf(" Null"); 660 break; 661 case MEDCLASS_LOCAL: 662 printf(" Local"); /* XXX */ 663 break; 664 case MEDCLASS_IPV4: 665 if (len != 7) 666 break; 667 TCHECK2(*(p + 3), 4); 668 printf(" IPv4 %s", ipaddr_string(p + 3)); 669 break; 670 case MEDCLASS_MAC: 671 if (len != 9) 672 break; 673 TCHECK(p[8]); 674 printf(" MAC %02x:%02x:%02x:%02x:%02x:%02x", 675 p[3], p[4], p[5], p[6], p[7], p[8]); 676 break; 677 case MEDCLASS_MNB: 678 printf(" Magic-Num-Block"); /* XXX */ 679 break; 680 case MEDCLASS_PSNDN: 681 printf(" PSNDN"); /* XXX */ 682 break; 683 } 684 break; 685 686 /* XXX: to be supported */ 687 #if 0 688 case LCPOPT_DEP6: 689 case LCPOPT_FCSALT: 690 case LCPOPT_SDP: 691 case LCPOPT_NUMMODE: 692 case LCPOPT_DEP12: 693 case LCPOPT_DEP14: 694 case LCPOPT_DEP15: 695 case LCPOPT_DEP16: 696 case LCPOPT_MLSSNHF: 697 case LCPOPT_PROP: 698 case LCPOPT_DCEID: 699 case LCPOPT_MPP: 700 case LCPOPT_LCPAOPT: 701 case LCPOPT_COBS: 702 case LCPOPT_PE: 703 case LCPOPT_MLHF: 704 case LCPOPT_I18N: 705 case LCPOPT_SDLOS: 706 case LCPOPT_PPPMUX: 707 break; 708 #endif 709 } 710 return len; 711 712 trunc: 713 printf("[|lcp]"); 714 return 0; 715 } 716 717 /* CHAP */ 718 static void 719 handle_chap(const u_char *p, int length) 720 { 721 u_int code, len; 722 int val_size, name_size, msg_size; 723 const u_char *p0; 724 int i; 725 726 p0 = p; 727 if (length < 1) { 728 printf("[|chap]"); 729 return; 730 } else if (length < 4) { 731 TCHECK(*p); 732 printf("[|chap 0x%02x]", *p); 733 return; 734 } 735 736 TCHECK(*p); 737 code = *p; 738 if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX)) 739 printf("%s", chapcode[code - 1]); 740 else { 741 printf("0x%02x", code); 742 return; 743 } 744 p++; 745 746 TCHECK(*p); 747 printf("(%u)", *p); /* ID */ 748 p++; 749 750 TCHECK2(*p, 2); 751 len = EXTRACT_16BITS(p); 752 p += 2; 753 754 /* 755 * Note that this is a generic CHAP decoding routine. Since we 756 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1, 757 * MS-CHAPv2) is used at this point, we can't decode packet 758 * specifically to each algorithms. Instead, we simply decode 759 * the GCD (Gratest Common Denominator) for all algorithms. 760 */ 761 switch (code) { 762 case CHAP_CHAL: 763 case CHAP_RESP: 764 if (length - (p - p0) < 1) 765 return; 766 TCHECK(*p); 767 val_size = *p; /* value size */ 768 p++; 769 if (length - (p - p0) < val_size) 770 return; 771 printf(", Value "); 772 for (i = 0; i < val_size; i++) { 773 TCHECK(*p); 774 printf("%02x", *p++); 775 } 776 name_size = len - (p - p0); 777 printf(", Name "); 778 for (i = 0; i < name_size; i++) { 779 TCHECK(*p); 780 safeputchar(*p++); 781 } 782 break; 783 case CHAP_SUCC: 784 case CHAP_FAIL: 785 msg_size = len - (p - p0); 786 printf(", Msg "); 787 for (i = 0; i< msg_size; i++) { 788 TCHECK(*p); 789 safeputchar(*p++); 790 } 791 break; 792 } 793 return; 794 795 trunc: 796 printf("[|chap]"); 797 } 798 799 /* PAP (see RFC 1334) */ 800 static void 801 handle_pap(const u_char *p, int length) 802 { 803 u_int code, len; 804 int peerid_len, passwd_len, msg_len; 805 const u_char *p0; 806 int i; 807 808 p0 = p; 809 if (length < 1) { 810 printf("[|pap]"); 811 return; 812 } else if (length < 4) { 813 TCHECK(*p); 814 printf("[|pap 0x%02x]", *p); 815 return; 816 } 817 818 TCHECK(*p); 819 code = *p; 820 if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX)) 821 printf("%s", papcode[code - 1]); 822 else { 823 printf("0x%02x", code); 824 return; 825 } 826 p++; 827 828 TCHECK(*p); 829 printf("(%u)", *p); /* ID */ 830 p++; 831 832 TCHECK2(*p, 2); 833 len = EXTRACT_16BITS(p); 834 p += 2; 835 836 switch (code) { 837 case PAP_AREQ: 838 if (length - (p - p0) < 1) 839 return; 840 TCHECK(*p); 841 peerid_len = *p; /* Peer-ID Length */ 842 p++; 843 if (length - (p - p0) < peerid_len) 844 return; 845 printf(", Peer "); 846 for (i = 0; i < peerid_len; i++) { 847 TCHECK(*p); 848 safeputchar(*p++); 849 } 850 851 if (length - (p - p0) < 1) 852 return; 853 TCHECK(*p); 854 passwd_len = *p; /* Password Length */ 855 p++; 856 if (length - (p - p0) < passwd_len) 857 return; 858 printf(", Name "); 859 for (i = 0; i < passwd_len; i++) { 860 TCHECK(*p); 861 safeputchar(*p++); 862 } 863 break; 864 case PAP_AACK: 865 case PAP_ANAK: 866 if (length - (p - p0) < 1) 867 return; 868 TCHECK(*p); 869 msg_len = *p; /* Msg-Length */ 870 p++; 871 if (length - (p - p0) < msg_len) 872 return; 873 printf(", Msg "); 874 for (i = 0; i< msg_len; i++) { 875 TCHECK(*p); 876 safeputchar(*p++); 877 } 878 break; 879 } 880 return; 881 882 trunc: 883 printf("[|pap]"); 884 } 885 886 /* BAP */ 887 static void 888 handle_bap(const u_char *p _U_, int length _U_) 889 { 890 /* XXX: to be supported!! */ 891 } 892 893 894 /* IPCP config options */ 895 static int 896 print_ipcp_config_options(const u_char *p, int length) 897 { 898 int len, opt; 899 900 if (length < 2) 901 return 0; 902 TCHECK2(*p, 2); 903 len = p[1]; 904 opt = p[0]; 905 if (length < len) 906 return 0; 907 switch (opt) { 908 case IPCPOPT_2ADDR: /* deprecated */ 909 if (len != 10) 910 goto invlen; 911 TCHECK2(*(p + 6), 4); 912 printf(", IP-Addrs src %s, dst %s", 913 ipaddr_string(p + 2), 914 ipaddr_string(p + 6)); 915 break; 916 case IPCPOPT_IPCOMP: 917 if (len < 4) 918 goto invlen; 919 printf(", IP-Comp"); 920 TCHECK2(*(p + 2), 2); 921 if (EXTRACT_16BITS(p + 2) == PPP_VJC) { 922 printf(" VJ-Comp"); 923 /* XXX: VJ-Comp parameters should be decoded */ 924 } else 925 printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2)); 926 break; 927 case IPCPOPT_ADDR: 928 if (len != 6) 929 goto invlen; 930 TCHECK2(*(p + 2), 4); 931 printf(", IP-Addr %s", ipaddr_string(p + 2)); 932 break; 933 case IPCPOPT_MOBILE4: 934 if (len != 6) 935 goto invlen; 936 TCHECK2(*(p + 2), 4); 937 printf(", Home-Addr %s", ipaddr_string(p + 2)); 938 break; 939 case IPCPOPT_PRIDNS: 940 if (len != 6) 941 goto invlen; 942 TCHECK2(*(p + 2), 4); 943 printf(", Pri-DNS %s", ipaddr_string(p + 2)); 944 break; 945 case IPCPOPT_PRINBNS: 946 if (len != 6) 947 goto invlen; 948 TCHECK2(*(p + 2), 4); 949 printf(", Pri-NBNS %s", ipaddr_string(p + 2)); 950 break; 951 case IPCPOPT_SECDNS: 952 if (len != 6) 953 goto invlen; 954 TCHECK2(*(p + 2), 4); 955 printf(", Sec-DNS %s", ipaddr_string(p + 2)); 956 break; 957 case IPCPOPT_SECNBNS: 958 if (len != 6) 959 goto invlen; 960 TCHECK2(*(p + 2), 4); 961 printf(", Sec-NBNS %s", ipaddr_string(p + 2)); 962 break; 963 default: 964 printf(", unknown-%d", opt); 965 break; 966 } 967 return len; 968 969 invlen: 970 printf(", invalid-length-%d", opt); 971 return 0; 972 973 trunc: 974 printf("[|ipcp]"); 975 return 0; 976 } 977 978 /* CCP config options */ 979 static int 980 print_ccp_config_options(const u_char *p, int length) 981 { 982 int len, opt; 983 984 if (length < 2) 985 return 0; 986 TCHECK2(*p, 2); 987 len = p[1]; 988 opt = p[0]; 989 if (length < len) 990 return 0; 991 if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX)) 992 printf(", %s", ccpconfopts[opt]); 993 #if 0 /* XXX */ 994 switch (opt) { 995 case CCPOPT_OUI: 996 case CCPOPT_PRED1: 997 case CCPOPT_PRED2: 998 case CCPOPT_PJUMP: 999 case CCPOPT_HPPPC: 1000 case CCPOPT_STACLZS: 1001 case CCPOPT_MPPC: 1002 case CCPOPT_GFZA: 1003 case CCPOPT_V42BIS: 1004 case CCPOPT_BSDCOMP: 1005 case CCPOPT_LZSDCP: 1006 case CCPOPT_MVRCA: 1007 case CCPOPT_DEC: 1008 case CCPOPT_DEFLATE: 1009 case CCPOPT_RESV: 1010 break; 1011 1012 default: 1013 printf(", unknown-%d", opt); 1014 break; 1015 } 1016 #endif 1017 return len; 1018 1019 trunc: 1020 printf("[|ccp]"); 1021 return 0; 1022 } 1023 1024 /* BACP config options */ 1025 static int 1026 print_bacp_config_options(const u_char *p, int length) 1027 { 1028 int len, opt; 1029 1030 if (length < 2) 1031 return 0; 1032 TCHECK2(*p, 2); 1033 len = p[1]; 1034 opt = p[0]; 1035 if (length < len) 1036 return 0; 1037 if (opt == BACPOPT_FPEER) { 1038 TCHECK2(*(p + 2), 4); 1039 printf(", Favored-Peer"); 1040 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2)); 1041 } else { 1042 printf(", unknown-option-%d", opt); 1043 } 1044 return len; 1045 1046 trunc: 1047 printf("[|bacp]"); 1048 return 0; 1049 } 1050 1051 1052 /* PPP */ 1053 static void 1054 handle_ppp(u_int proto, const u_char *p, int length) 1055 { 1056 switch (proto) { 1057 case PPP_LCP: 1058 case PPP_IPCP: 1059 case PPP_OSICP: 1060 case PPP_MPLSCP: 1061 case PPP_IPV6CP: 1062 case PPP_CCP: 1063 case PPP_BACP: 1064 handle_ctrl_proto(proto, p, length); 1065 break; 1066 case PPP_CHAP: 1067 handle_chap(p, length); 1068 break; 1069 case PPP_PAP: 1070 handle_pap(p, length); 1071 break; 1072 case PPP_BAP: /* XXX: not yet completed */ 1073 handle_bap(p, length); 1074 break; 1075 case ETHERTYPE_IP: /*XXX*/ 1076 case PPP_IP: 1077 ip_print(p, length); 1078 break; 1079 #ifdef INET6 1080 case ETHERTYPE_IPV6: /*XXX*/ 1081 case PPP_IPV6: 1082 ip6_print(p, length); 1083 break; 1084 #endif 1085 case ETHERTYPE_IPX: /*XXX*/ 1086 case PPP_IPX: 1087 ipx_print(p, length); 1088 break; 1089 case PPP_OSI: 1090 isoclns_print(p, length, length); 1091 break; 1092 case PPP_MPLS_UCAST: 1093 case PPP_MPLS_MCAST: 1094 mpls_print(p, length); 1095 break; 1096 default: 1097 printf("unknown PPP protocol (0x%04x)", proto); 1098 print_unknown_data(p,"\n\t",length); 1099 break; 1100 } 1101 } 1102 1103 /* Standard PPP printer */ 1104 u_int 1105 ppp_print(register const u_char *p, u_int length) 1106 { 1107 u_int proto; 1108 u_int olen = length; /* _o_riginal length */ 1109 u_int hdr_len = 0; 1110 1111 /* 1112 * Here, we assume that p points to the Address and Control 1113 * field (if they present). 1114 */ 1115 if (length < 2) 1116 goto trunc; 1117 TCHECK2(*p, 2); 1118 if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) { 1119 p += 2; /* ACFC not used */ 1120 length -= 2; 1121 hdr_len += 2; 1122 } 1123 1124 if (length < 2) 1125 goto trunc; 1126 TCHECK(*p); 1127 if (*p % 2) { 1128 proto = *p; /* PFC is used */ 1129 p++; 1130 length--; 1131 hdr_len++; 1132 } else { 1133 TCHECK2(*p, 2); 1134 proto = EXTRACT_16BITS(p); 1135 p += 2; 1136 length -= 2; 1137 hdr_len += 2; 1138 } 1139 1140 if (eflag) 1141 printf("PPP-%s (0x%04x), length %u: ", 1142 tok2str(ppptype2str, "unknown", proto), 1143 proto, 1144 olen); 1145 1146 handle_ppp(proto, p, length); 1147 return (hdr_len); 1148 trunc: 1149 printf("[|ppp]"); 1150 return (0); 1151 } 1152 1153 1154 /* PPP I/F printer */ 1155 u_int 1156 ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p) 1157 { 1158 register u_int length = h->len; 1159 register u_int caplen = h->caplen; 1160 1161 if (caplen < PPP_HDRLEN) { 1162 printf("[|ppp]"); 1163 return (caplen); 1164 } 1165 1166 #if 0 1167 /* 1168 * XXX: seems to assume that there are 2 octets prepended to an 1169 * actual PPP frame. The 1st octet looks like Input/Output flag 1170 * while 2nd octet is unknown, at least to me 1171 * (mshindo@mshindo.net). 1172 * 1173 * That was what the original tcpdump code did. 1174 * 1175 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound 1176 * packets and 0 for inbound packets - but only if the 1177 * protocol field has the 0x8000 bit set (i.e., it's a network 1178 * control protocol); it does so before running the packet through 1179 * "bpf_filter" to see if it should be discarded, and to see 1180 * if we should update the time we sent the most recent packet... 1181 * 1182 * ...but it puts the original address field back after doing 1183 * so. 1184 * 1185 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion. 1186 * 1187 * I don't know if any PPP implementation handed up to a BPF 1188 * device packets with the first octet being 1 for outbound and 1189 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know 1190 * whether that ever needs to be checked or not. 1191 * 1192 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP, 1193 * and its tcpdump appears to assume that the frame always 1194 * begins with an address field and a control field, and that 1195 * the address field might be 0x0f or 0x8f, for Cisco 1196 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1197 * 1547, as well as 0xff, for PPP in HDLC-like framing as per 1198 * RFC 1662. 1199 * 1200 * (Is the Cisco framing in question what DLT_C_HDLC, in 1201 * BSD/OS, is?) 1202 */ 1203 if (eflag) 1204 printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]); 1205 #endif 1206 1207 ppp_print(p, length); 1208 1209 return (0); 1210 } 1211 1212 /* 1213 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like 1214 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547, 1215 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL, 1216 * discard them *if* those are the first two octets, and parse the remaining 1217 * packet as a PPP packet, as "ppp_print()" does). 1218 * 1219 * This handles, for example, DLT_PPP_SERIAL in NetBSD. 1220 */ 1221 u_int 1222 ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p) 1223 { 1224 register u_int length = h->len; 1225 register u_int caplen = h->caplen; 1226 u_int proto; 1227 u_int hdrlen = 0; 1228 1229 if (caplen < 2) { 1230 printf("[|ppp]"); 1231 return (caplen); 1232 } 1233 1234 switch (p[0]) { 1235 1236 case PPP_ADDRESS: 1237 if (caplen < 4) { 1238 printf("[|ppp]"); 1239 return (caplen); 1240 } 1241 1242 if (eflag) 1243 printf("%02x %02x %d ", p[0], p[1], length); 1244 p += 2; 1245 length -= 2; 1246 hdrlen += 2; 1247 1248 proto = EXTRACT_16BITS(p); 1249 p += 2; 1250 length -= 2; 1251 hdrlen += 2; 1252 printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); 1253 1254 handle_ppp(proto, p, length); 1255 break; 1256 1257 case CHDLC_UNICAST: 1258 case CHDLC_BCAST: 1259 return (chdlc_if_print(h, p)); 1260 1261 default: 1262 if (eflag) 1263 printf("%02x %02x %d ", p[0], p[1], length); 1264 p += 2; 1265 length -= 2; 1266 hdrlen += 2; 1267 1268 /* 1269 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats 1270 * the next two octets as an Ethernet type; does that 1271 * ever happen? 1272 */ 1273 printf("unknown addr %02x; ctrl %02x", p[0], p[1]); 1274 break; 1275 } 1276 1277 return (hdrlen); 1278 } 1279 1280 #define PPP_BSDI_HDRLEN 24 1281 1282 /* BSD/OS specific PPP printer */ 1283 u_int 1284 ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_) 1285 { 1286 register int hdrlength; 1287 #ifdef __bsdi__ 1288 register u_int length = h->len; 1289 register u_int caplen = h->caplen; 1290 u_int16_t ptype; 1291 const u_char *q; 1292 int i; 1293 1294 if (caplen < PPP_BSDI_HDRLEN) { 1295 printf("[|ppp]"); 1296 return (caplen) 1297 } 1298 1299 hdrlength = 0; 1300 1301 #if 0 1302 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) { 1303 if (eflag) 1304 printf("%02x %02x ", p[0], p[1]); 1305 p += 2; 1306 hdrlength = 2; 1307 } 1308 1309 if (eflag) 1310 printf("%d ", length); 1311 /* Retrieve the protocol type */ 1312 if (*p & 01) { 1313 /* Compressed protocol field */ 1314 ptype = *p; 1315 if (eflag) 1316 printf("%02x ", ptype); 1317 p++; 1318 hdrlength += 1; 1319 } else { 1320 /* Un-compressed protocol field */ 1321 ptype = ntohs(*(u_int16_t *)p); 1322 if (eflag) 1323 printf("%04x ", ptype); 1324 p += 2; 1325 hdrlength += 2; 1326 } 1327 #else 1328 ptype = 0; /*XXX*/ 1329 if (eflag) 1330 printf("%c ", p[SLC_DIR] ? 'O' : 'I'); 1331 if (p[SLC_LLHL]) { 1332 /* link level header */ 1333 struct ppp_header *ph; 1334 1335 q = p + SLC_BPFHDRLEN; 1336 ph = (struct ppp_header *)q; 1337 if (ph->phdr_addr == PPP_ADDRESS 1338 && ph->phdr_ctl == PPP_CONTROL) { 1339 if (eflag) 1340 printf("%02x %02x ", q[0], q[1]); 1341 ptype = ntohs(ph->phdr_type); 1342 if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) { 1343 printf("%s ", tok2str(ppptype2str, 1344 "proto-#%d", ptype)); 1345 } 1346 } else { 1347 if (eflag) { 1348 printf("LLH=["); 1349 for (i = 0; i < p[SLC_LLHL]; i++) 1350 printf("%02x", q[i]); 1351 printf("] "); 1352 } 1353 } 1354 } 1355 if (eflag) 1356 printf("%d ", length); 1357 if (p[SLC_CHL]) { 1358 q = p + SLC_BPFHDRLEN + p[SLC_LLHL]; 1359 1360 switch (ptype) { 1361 case PPP_VJC: 1362 ptype = vjc_print(q, ptype); 1363 hdrlength = PPP_BSDI_HDRLEN; 1364 p += hdrlength; 1365 switch (ptype) { 1366 case PPP_IP: 1367 ip_print(p, length); 1368 break; 1369 #ifdef INET6 1370 case PPP_IPV6: 1371 ip6_print(p, length); 1372 break; 1373 #endif 1374 case PPP_MPLS_UCAST: 1375 case PPP_MPLS_MCAST: 1376 mpls_print(p, length); 1377 break; 1378 } 1379 goto printx; 1380 case PPP_VJNC: 1381 ptype = vjc_print(q, ptype); 1382 hdrlength = PPP_BSDI_HDRLEN; 1383 p += hdrlength; 1384 switch (ptype) { 1385 case PPP_IP: 1386 ip_print(p, length); 1387 break; 1388 #ifdef INET6 1389 case PPP_IPV6: 1390 ip6_print(p, length); 1391 break; 1392 #endif 1393 case PPP_MPLS_UCAST: 1394 case PPP_MPLS_MCAST: 1395 mpls_print(p, length); 1396 break; 1397 } 1398 goto printx; 1399 default: 1400 if (eflag) { 1401 printf("CH=["); 1402 for (i = 0; i < p[SLC_LLHL]; i++) 1403 printf("%02x", q[i]); 1404 printf("] "); 1405 } 1406 break; 1407 } 1408 } 1409 1410 hdrlength = PPP_BSDI_HDRLEN; 1411 #endif 1412 1413 length -= hdrlength; 1414 p += hdrlength; 1415 1416 switch (ptype) { 1417 case PPP_IP: 1418 ip_print(p, length); 1419 break; 1420 #ifdef INET6 1421 case PPP_IPV6: 1422 ip6_print(p, length); 1423 break; 1424 #endif 1425 case PPP_MPLS_UCAST: 1426 case PPP_MPLS_MCAST: 1427 mpls_print(p, length); 1428 break; 1429 default: 1430 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype)); 1431 } 1432 1433 printx: 1434 #else /* __bsdi */ 1435 hdrlength = 0; 1436 #endif /* __bsdi__ */ 1437 return (hdrlength); 1438 } 1439