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 25 /* 26 * TODO: 27 * o resolve XXX as much as possible 28 * o MP support 29 * o BAP support 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static const char rcsid[] _U_ = 36 "@(#) Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.114 2005-12-05 11:35:58 hannes Exp (LBL)"; 37 #else 38 __RCSID("$NetBSD: print-ppp.c,v 1.4 2013/12/31 17:33:31 christos Exp $"); 39 #endif 40 #endif 41 42 #ifdef HAVE_CONFIG_H 43 #include "config.h" 44 #endif 45 46 #include <tcpdump-stdinc.h> 47 48 #ifdef __bsdi__ 49 #include <net/slcompress.h> 50 #include <net/if_ppp.h> 51 #endif 52 53 #include <pcap.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 57 #include "interface.h" 58 #include "extract.h" 59 #include "addrtoname.h" 60 #include "ppp.h" 61 #include "chdlc.h" 62 #include "ethertype.h" 63 #include "oui.h" 64 65 /* 66 * The following constatns are defined by IANA. Please refer to 67 * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers 68 * for the up-to-date information. 69 */ 70 71 /* Protocol Codes defined in ppp.h */ 72 73 static const struct tok ppptype2str[] = { 74 { PPP_IP, "IP" }, 75 { PPP_OSI, "OSI" }, 76 { PPP_NS, "NS" }, 77 { PPP_DECNET, "DECNET" }, 78 { PPP_APPLE, "APPLE" }, 79 { PPP_IPX, "IPX" }, 80 { PPP_VJC, "VJC IP" }, 81 { PPP_VJNC, "VJNC IP" }, 82 { PPP_BRPDU, "BRPDU" }, 83 { PPP_STII, "STII" }, 84 { PPP_VINES, "VINES" }, 85 { PPP_MPLS_UCAST, "MPLS" }, 86 { PPP_MPLS_MCAST, "MPLS" }, 87 { PPP_COMP, "Compressed"}, 88 { PPP_ML, "MLPPP"}, 89 { PPP_IPV6, "IP6"}, 90 91 { PPP_HELLO, "HELLO" }, 92 { PPP_LUXCOM, "LUXCOM" }, 93 { PPP_SNS, "SNS" }, 94 { PPP_IPCP, "IPCP" }, 95 { PPP_OSICP, "OSICP" }, 96 { PPP_NSCP, "NSCP" }, 97 { PPP_DECNETCP, "DECNETCP" }, 98 { PPP_APPLECP, "APPLECP" }, 99 { PPP_IPXCP, "IPXCP" }, 100 { PPP_STIICP, "STIICP" }, 101 { PPP_VINESCP, "VINESCP" }, 102 { PPP_IPV6CP, "IP6CP" }, 103 { PPP_MPLSCP, "MPLSCP" }, 104 105 { PPP_LCP, "LCP" }, 106 { PPP_PAP, "PAP" }, 107 { PPP_LQM, "LQM" }, 108 { PPP_CHAP, "CHAP" }, 109 { PPP_EAP, "EAP" }, 110 { PPP_SPAP, "SPAP" }, 111 { PPP_SPAP_OLD, "Old-SPAP" }, 112 { PPP_BACP, "BACP" }, 113 { PPP_BAP, "BAP" }, 114 { PPP_MPCP, "MLPPP-CP" }, 115 { 0, NULL } 116 }; 117 118 /* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */ 119 120 #define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */ 121 #define CPCODES_CONF_REQ 1 /* Configure-Request */ 122 #define CPCODES_CONF_ACK 2 /* Configure-Ack */ 123 #define CPCODES_CONF_NAK 3 /* Configure-Nak */ 124 #define CPCODES_CONF_REJ 4 /* Configure-Reject */ 125 #define CPCODES_TERM_REQ 5 /* Terminate-Request */ 126 #define CPCODES_TERM_ACK 6 /* Terminate-Ack */ 127 #define CPCODES_CODE_REJ 7 /* Code-Reject */ 128 #define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */ 129 #define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */ 130 #define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */ 131 #define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */ 132 #define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */ 133 #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */ 134 #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */ 135 #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */ 136 137 static const struct tok cpcodes[] = { 138 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */ 139 {CPCODES_CONF_REQ, "Conf-Request"}, 140 {CPCODES_CONF_ACK, "Conf-Ack"}, 141 {CPCODES_CONF_NAK, "Conf-Nack"}, 142 {CPCODES_CONF_REJ, "Conf-Reject"}, 143 {CPCODES_TERM_REQ, "Term-Request"}, 144 {CPCODES_TERM_ACK, "Term-Ack"}, 145 {CPCODES_CODE_REJ, "Code-Reject"}, 146 {CPCODES_PROT_REJ, "Prot-Reject"}, 147 {CPCODES_ECHO_REQ, "Echo-Request"}, 148 {CPCODES_ECHO_RPL, "Echo-Reply"}, 149 {CPCODES_DISC_REQ, "Disc-Req"}, 150 {CPCODES_ID, "Ident"}, /* RFC1570 */ 151 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */ 152 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */ 153 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */ 154 {0, NULL} 155 }; 156 157 /* LCP Config Options */ 158 159 #define LCPOPT_VEXT 0 160 #define LCPOPT_MRU 1 161 #define LCPOPT_ACCM 2 162 #define LCPOPT_AP 3 163 #define LCPOPT_QP 4 164 #define LCPOPT_MN 5 165 #define LCPOPT_DEP6 6 166 #define LCPOPT_PFC 7 167 #define LCPOPT_ACFC 8 168 #define LCPOPT_FCSALT 9 169 #define LCPOPT_SDP 10 170 #define LCPOPT_NUMMODE 11 171 #define LCPOPT_DEP12 12 172 #define LCPOPT_CBACK 13 173 #define LCPOPT_DEP14 14 174 #define LCPOPT_DEP15 15 175 #define LCPOPT_DEP16 16 176 #define LCPOPT_MLMRRU 17 177 #define LCPOPT_MLSSNHF 18 178 #define LCPOPT_MLED 19 179 #define LCPOPT_PROP 20 180 #define LCPOPT_DCEID 21 181 #define LCPOPT_MPP 22 182 #define LCPOPT_LD 23 183 #define LCPOPT_LCPAOPT 24 184 #define LCPOPT_COBS 25 185 #define LCPOPT_PE 26 186 #define LCPOPT_MLHF 27 187 #define LCPOPT_I18N 28 188 #define LCPOPT_SDLOS 29 189 #define LCPOPT_PPPMUX 30 190 191 #define LCPOPT_MIN LCPOPT_VEXT 192 #define LCPOPT_MAX LCPOPT_PPPMUX 193 194 static const char *lcpconfopts[] = { 195 "Vend-Ext", /* (0) */ 196 "MRU", /* (1) */ 197 "ACCM", /* (2) */ 198 "Auth-Prot", /* (3) */ 199 "Qual-Prot", /* (4) */ 200 "Magic-Num", /* (5) */ 201 "deprecated(6)", /* used to be a Quality Protocol */ 202 "PFC", /* (7) */ 203 "ACFC", /* (8) */ 204 "FCS-Alt", /* (9) */ 205 "SDP", /* (10) */ 206 "Num-Mode", /* (11) */ 207 "deprecated(12)", /* used to be a Multi-Link-Procedure*/ 208 "Call-Back", /* (13) */ 209 "deprecated(14)", /* used to be a Connect-Time */ 210 "deprecated(15)", /* used to be a Compund-Frames */ 211 "deprecated(16)", /* used to be a Nominal-Data-Encap */ 212 "MRRU", /* (17) */ 213 "12-Bit seq #", /* (18) */ 214 "End-Disc", /* (19) */ 215 "Proprietary", /* (20) */ 216 "DCE-Id", /* (21) */ 217 "MP+", /* (22) */ 218 "Link-Disc", /* (23) */ 219 "LCP-Auth-Opt", /* (24) */ 220 "COBS", /* (25) */ 221 "Prefix-elision", /* (26) */ 222 "Multilink-header-Form",/* (27) */ 223 "I18N", /* (28) */ 224 "SDL-over-SONET/SDH", /* (29) */ 225 "PPP-Muxing", /* (30) */ 226 }; 227 228 /* ECP - to be supported */ 229 230 /* CCP Config Options */ 231 232 #define CCPOPT_OUI 0 /* RFC1962 */ 233 #define CCPOPT_PRED1 1 /* RFC1962 */ 234 #define CCPOPT_PRED2 2 /* RFC1962 */ 235 #define CCPOPT_PJUMP 3 /* RFC1962 */ 236 /* 4-15 unassigned */ 237 #define CCPOPT_HPPPC 16 /* RFC1962 */ 238 #define CCPOPT_STACLZS 17 /* RFC1974 */ 239 #define CCPOPT_MPPC 18 /* RFC2118 */ 240 #define CCPOPT_GFZA 19 /* RFC1962 */ 241 #define CCPOPT_V42BIS 20 /* RFC1962 */ 242 #define CCPOPT_BSDCOMP 21 /* RFC1977 */ 243 /* 22 unassigned */ 244 #define CCPOPT_LZSDCP 23 /* RFC1967 */ 245 #define CCPOPT_MVRCA 24 /* RFC1975 */ 246 #define CCPOPT_DEC 25 /* RFC1976 */ 247 #define CCPOPT_DEFLATE 26 /* RFC1979 */ 248 /* 27-254 unassigned */ 249 #define CCPOPT_RESV 255 /* RFC1962 */ 250 251 static const struct tok ccpconfopts_values[] = { 252 { CCPOPT_OUI, "OUI" }, 253 { CCPOPT_PRED1, "Pred-1" }, 254 { CCPOPT_PRED2, "Pred-2" }, 255 { CCPOPT_PJUMP, "Puddle" }, 256 { CCPOPT_HPPPC, "HP-PPC" }, 257 { CCPOPT_STACLZS, "Stac-LZS" }, 258 { CCPOPT_MPPC, "MPPC" }, 259 { CCPOPT_GFZA, "Gand-FZA" }, 260 { CCPOPT_V42BIS, "V.42bis" }, 261 { CCPOPT_BSDCOMP, "BSD-Comp" }, 262 { CCPOPT_LZSDCP, "LZS-DCP" }, 263 { CCPOPT_MVRCA, "MVRCA" }, 264 { CCPOPT_DEC, "DEC" }, 265 { CCPOPT_DEFLATE, "Deflate" }, 266 { CCPOPT_RESV, "Reserved"}, 267 {0, NULL} 268 }; 269 270 /* BACP Config Options */ 271 272 #define BACPOPT_FPEER 1 /* RFC2125 */ 273 274 static const struct tok bacconfopts_values[] = { 275 { BACPOPT_FPEER, "Favored-Peer" }, 276 {0, NULL} 277 }; 278 279 280 /* SDCP - to be supported */ 281 282 /* IPCP Config Options */ 283 #define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */ 284 #define IPCPOPT_IPCOMP 2 /* RFC1332 */ 285 #define IPCPOPT_ADDR 3 /* RFC1332 */ 286 #define IPCPOPT_MOBILE4 4 /* RFC2290 */ 287 #define IPCPOPT_PRIDNS 129 /* RFC1877 */ 288 #define IPCPOPT_PRINBNS 130 /* RFC1877 */ 289 #define IPCPOPT_SECDNS 131 /* RFC1877 */ 290 #define IPCPOPT_SECNBNS 132 /* RFC1877 */ 291 292 static const struct tok ipcpopt_values[] = { 293 { IPCPOPT_2ADDR, "IP-Addrs" }, 294 { IPCPOPT_IPCOMP, "IP-Comp" }, 295 { IPCPOPT_ADDR, "IP-Addr" }, 296 { IPCPOPT_MOBILE4, "Home-Addr" }, 297 { IPCPOPT_PRIDNS, "Pri-DNS" }, 298 { IPCPOPT_PRINBNS, "Pri-NBNS" }, 299 { IPCPOPT_SECDNS, "Sec-DNS" }, 300 { IPCPOPT_SECNBNS, "Sec-NBNS" }, 301 { 0, NULL } 302 }; 303 304 #define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */ 305 #define IPCPOPT_IPCOMP_MINLEN 14 306 307 static const struct tok ipcpopt_compproto_values[] = { 308 { PPP_VJC, "VJ-Comp" }, 309 { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" }, 310 { 0, NULL } 311 }; 312 313 static const struct tok ipcpopt_compproto_subopt_values[] = { 314 { 1, "RTP-Compression" }, 315 { 2, "Enhanced RTP-Compression" }, 316 { 0, NULL } 317 }; 318 319 /* IP6CP Config Options */ 320 #define IP6CP_IFID 1 321 322 static const struct tok ip6cpopt_values[] = { 323 { IP6CP_IFID, "Interface-ID" }, 324 { 0, NULL } 325 }; 326 327 /* ATCP - to be supported */ 328 /* OSINLCP - to be supported */ 329 /* BVCP - to be supported */ 330 /* BCP - to be supported */ 331 /* IPXCP - to be supported */ 332 /* MPLSCP - to be supported */ 333 334 /* Auth Algorithms */ 335 336 /* 0-4 Reserved (RFC1994) */ 337 #define AUTHALG_CHAPMD5 5 /* RFC1994 */ 338 #define AUTHALG_MSCHAP1 128 /* RFC2433 */ 339 #define AUTHALG_MSCHAP2 129 /* RFC2795 */ 340 341 static const struct tok authalg_values[] = { 342 { AUTHALG_CHAPMD5, "MD5" }, 343 { AUTHALG_MSCHAP1, "MS-CHAPv1" }, 344 { AUTHALG_MSCHAP2, "MS-CHAPv2" }, 345 { 0, NULL } 346 }; 347 348 /* FCS Alternatives - to be supported */ 349 350 /* Multilink Endpoint Discriminator (RFC1717) */ 351 #define MEDCLASS_NULL 0 /* Null Class */ 352 #define MEDCLASS_LOCAL 1 /* Locally Assigned */ 353 #define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */ 354 #define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */ 355 #define MEDCLASS_MNB 4 /* PPP Magic Number Block */ 356 #define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */ 357 358 /* PPP LCP Callback */ 359 #define CALLBACK_AUTH 0 /* Location determined by user auth */ 360 #define CALLBACK_DSTR 1 /* Dialing string */ 361 #define CALLBACK_LID 2 /* Location identifier */ 362 #define CALLBACK_E164 3 /* E.164 number */ 363 #define CALLBACK_X500 4 /* X.500 distinguished name */ 364 #define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */ 365 366 static const struct tok ppp_callback_values[] = { 367 { CALLBACK_AUTH, "UserAuth" }, 368 { CALLBACK_DSTR, "DialString" }, 369 { CALLBACK_LID, "LocalID" }, 370 { CALLBACK_E164, "E.164" }, 371 { CALLBACK_X500, "X.500" }, 372 { CALLBACK_CBCP, "CBCP" }, 373 { 0, NULL } 374 }; 375 376 /* CHAP */ 377 378 #define CHAP_CHAL 1 379 #define CHAP_RESP 2 380 #define CHAP_SUCC 3 381 #define CHAP_FAIL 4 382 383 static const struct tok chapcode_values[] = { 384 { CHAP_CHAL, "Challenge" }, 385 { CHAP_RESP, "Response" }, 386 { CHAP_SUCC, "Success" }, 387 { CHAP_FAIL, "Fail" }, 388 { 0, NULL} 389 }; 390 391 /* PAP */ 392 393 #define PAP_AREQ 1 394 #define PAP_AACK 2 395 #define PAP_ANAK 3 396 397 static const struct tok papcode_values[] = { 398 { PAP_AREQ, "Auth-Req" }, 399 { PAP_AACK, "Auth-ACK" }, 400 { PAP_ANAK, "Auth-NACK" }, 401 { 0, NULL } 402 }; 403 404 /* BAP */ 405 #define BAP_CALLREQ 1 406 #define BAP_CALLRES 2 407 #define BAP_CBREQ 3 408 #define BAP_CBRES 4 409 #define BAP_LDQREQ 5 410 #define BAP_LDQRES 6 411 #define BAP_CSIND 7 412 #define BAP_CSRES 8 413 414 static void handle_ctrl_proto (u_int proto,const u_char *p, int length); 415 static void handle_chap (const u_char *p, int length); 416 static void handle_pap (const u_char *p, int length); 417 static void handle_bap (const u_char *p, int length); 418 static void handle_mlppp(const u_char *p, int length); 419 static int print_lcp_config_options (const u_char *p, int); 420 static int print_ipcp_config_options (const u_char *p, int); 421 static int print_ip6cp_config_options (const u_char *p, int); 422 static int print_ccp_config_options (const u_char *p, int); 423 static int print_bacp_config_options (const u_char *p, int); 424 static void handle_ppp (u_int proto, const u_char *p, int length); 425 static void ppp_hdlc(const u_char *p, int length); 426 427 /* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */ 428 static void 429 handle_ctrl_proto(u_int proto, const u_char *pptr, int length) 430 { 431 const char *typestr; 432 u_int code, len; 433 int (*pfunc)(const u_char *, int); 434 int x, j; 435 const u_char *tptr; 436 437 tptr=pptr; 438 439 typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto); 440 printf("%s, ",typestr); 441 442 if (length < 4) /* FIXME weak boundary checking */ 443 goto trunc; 444 TCHECK2(*tptr, 2); 445 446 code = *tptr++; 447 448 printf("%s (0x%02x), id %u, length %u", 449 tok2str(cpcodes, "Unknown Opcode",code), 450 code, 451 *tptr++, /* ID */ 452 length+2); 453 454 if (!vflag) 455 return; 456 457 if (length <= 4) 458 return; /* there may be a NULL confreq etc. */ 459 460 TCHECK2(*tptr, 2); 461 len = EXTRACT_16BITS(tptr); 462 tptr += 2; 463 464 printf("\n\tencoded length %u (=Option(s) length %u)",len,len-4); 465 466 if (vflag>1) 467 print_unknown_data(pptr-2,"\n\t",6); 468 469 470 switch (code) { 471 case CPCODES_VEXT: 472 if (length < 11) 473 break; 474 TCHECK2(*tptr, 4); 475 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 476 tptr += 4; 477 TCHECK2(*tptr, 3); 478 printf(" Vendor: %s (%u)", 479 tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)), 480 EXTRACT_24BITS(tptr)); 481 /* XXX: need to decode Kind and Value(s)? */ 482 break; 483 case CPCODES_CONF_REQ: 484 case CPCODES_CONF_ACK: 485 case CPCODES_CONF_NAK: 486 case CPCODES_CONF_REJ: 487 x = len - 4; /* Code(1), Identifier(1) and Length(2) */ 488 do { 489 switch (proto) { 490 case PPP_LCP: 491 pfunc = print_lcp_config_options; 492 break; 493 case PPP_IPCP: 494 pfunc = print_ipcp_config_options; 495 break; 496 case PPP_IPV6CP: 497 pfunc = print_ip6cp_config_options; 498 break; 499 case PPP_CCP: 500 pfunc = print_ccp_config_options; 501 break; 502 case PPP_BACP: 503 pfunc = print_bacp_config_options; 504 break; 505 default: 506 /* 507 * No print routine for the options for 508 * this protocol. 509 */ 510 pfunc = NULL; 511 break; 512 } 513 514 if (pfunc == NULL) /* catch the above null pointer if unknown CP */ 515 break; 516 517 if ((j = (*pfunc)(tptr, len)) == 0) 518 break; 519 x -= j; 520 tptr += j; 521 } while (x > 0); 522 break; 523 524 case CPCODES_TERM_REQ: 525 case CPCODES_TERM_ACK: 526 /* XXX: need to decode Data? */ 527 break; 528 case CPCODES_CODE_REJ: 529 /* XXX: need to decode Rejected-Packet? */ 530 break; 531 case CPCODES_PROT_REJ: 532 if (length < 6) 533 break; 534 TCHECK2(*tptr, 2); 535 printf("\n\t Rejected %s Protocol (0x%04x)", 536 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)), 537 EXTRACT_16BITS(tptr)); 538 /* XXX: need to decode Rejected-Information? - hexdump for now */ 539 if (len > 6) { 540 printf("\n\t Rejected Packet"); 541 print_unknown_data(tptr+2,"\n\t ",len-2); 542 } 543 break; 544 case CPCODES_ECHO_REQ: 545 case CPCODES_ECHO_RPL: 546 case CPCODES_DISC_REQ: 547 if (length < 8) 548 break; 549 TCHECK2(*tptr, 4); 550 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 551 /* XXX: need to decode Data? - hexdump for now */ 552 if (len > 8) { 553 printf("\n\t -----trailing data-----"); 554 TCHECK2(tptr[4], len-8); 555 print_unknown_data(tptr+4,"\n\t ",len-8); 556 } 557 break; 558 case CPCODES_ID: 559 if (length < 8) 560 break; 561 TCHECK2(*tptr, 4); 562 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 563 /* RFC 1661 says this is intended to be human readable */ 564 if (len > 8) { 565 printf("\n\t Message\n\t "); 566 fn_printn(tptr+4,len-4,snapend); 567 } 568 break; 569 case CPCODES_TIME_REM: 570 if (length < 12) 571 break; 572 TCHECK2(*tptr, 4); 573 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 574 TCHECK2(*(tptr + 4), 4); 575 printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4)); 576 /* XXX: need to decode Message? */ 577 break; 578 default: 579 /* XXX this is dirty but we do not get the 580 * original pointer passed to the begin 581 * the PPP packet */ 582 if (vflag <= 1) 583 print_unknown_data(pptr-2,"\n\t ",length+2); 584 break; 585 } 586 return; 587 588 trunc: 589 printf("[|%s]", typestr); 590 } 591 592 /* LCP config options */ 593 static int 594 print_lcp_config_options(const u_char *p, int length) 595 { 596 int len, opt; 597 598 if (length < 2) 599 return 0; 600 TCHECK2(*p, 2); 601 len = p[1]; 602 opt = p[0]; 603 if (length < len) 604 return 0; 605 if (len < 2) { 606 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) 607 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", lcpconfopts[opt],opt,len); 608 else 609 printf("\n\tunknown LCP option 0x%02x", opt); 610 return 0; 611 } 612 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) 613 printf("\n\t %s Option (0x%02x), length %u: ", lcpconfopts[opt],opt,len); 614 else { 615 printf("\n\tunknown LCP option 0x%02x", opt); 616 return len; 617 } 618 619 switch (opt) { 620 case LCPOPT_VEXT: 621 if (len >= 6) { 622 TCHECK2(*(p + 2), 3); 623 printf("Vendor: %s (%u)", 624 tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)), 625 EXTRACT_24BITS(p+2)); 626 #if 0 627 TCHECK(p[5]); 628 printf(", kind: 0x%02x", p[5]); 629 printf(", Value: 0x") 630 for (i = 0; i < len - 6; i++) { 631 TCHECK(p[6 + i]); 632 printf("%02x", p[6 + i]); 633 } 634 #endif 635 } 636 break; 637 case LCPOPT_MRU: 638 if (len == 4) { 639 TCHECK2(*(p + 2), 2); 640 printf("%u", EXTRACT_16BITS(p + 2)); 641 } 642 break; 643 case LCPOPT_ACCM: 644 if (len == 6) { 645 TCHECK2(*(p + 2), 4); 646 printf("0x%08x", EXTRACT_32BITS(p + 2)); 647 } 648 break; 649 case LCPOPT_AP: 650 if (len >= 4) { 651 TCHECK2(*(p + 2), 2); 652 printf("%s", tok2str(ppptype2str,"Unknown Auth Proto (0x04x)",EXTRACT_16BITS(p+2))); 653 654 switch (EXTRACT_16BITS(p+2)) { 655 case PPP_CHAP: 656 TCHECK(p[4]); 657 printf(", %s",tok2str(authalg_values,"Unknown Auth Alg %u",p[4])); 658 break; 659 case PPP_PAP: /* fall through */ 660 case PPP_EAP: 661 case PPP_SPAP: 662 case PPP_SPAP_OLD: 663 break; 664 default: 665 print_unknown_data(p,"\n\t",len); 666 } 667 } 668 break; 669 case LCPOPT_QP: 670 if (len >= 4) { 671 TCHECK2(*(p + 2), 2); 672 if (EXTRACT_16BITS(p+2) == PPP_LQM) 673 printf(" LQR"); 674 else 675 printf(" unknown"); 676 } 677 break; 678 case LCPOPT_MN: 679 if (len == 6) { 680 TCHECK2(*(p + 2), 4); 681 printf("0x%08x", EXTRACT_32BITS(p + 2)); 682 } 683 break; 684 case LCPOPT_PFC: 685 break; 686 case LCPOPT_ACFC: 687 break; 688 case LCPOPT_LD: 689 if (len == 4) { 690 TCHECK2(*(p + 2), 2); 691 printf("0x%04x", EXTRACT_16BITS(p + 2)); 692 } 693 break; 694 case LCPOPT_CBACK: 695 if (len < 3) 696 break; 697 TCHECK(p[2]); 698 printf("Callback Operation %s (%u)", 699 tok2str(ppp_callback_values,"Unknown",p[2]), 700 p[2]); 701 break; 702 case LCPOPT_MLMRRU: 703 if (len == 4) { 704 TCHECK2(*(p + 2), 2); 705 printf("%u", EXTRACT_16BITS(p + 2)); 706 } 707 break; 708 case LCPOPT_MLED: 709 if (len < 3) 710 break; 711 TCHECK(p[2]); 712 switch (p[2]) { /* class */ 713 case MEDCLASS_NULL: 714 printf("Null"); 715 break; 716 case MEDCLASS_LOCAL: 717 printf("Local"); /* XXX */ 718 break; 719 case MEDCLASS_IPV4: 720 if (len != 7) 721 break; 722 TCHECK2(*(p + 3), 4); 723 printf("IPv4 %s", ipaddr_string(p + 3)); 724 break; 725 case MEDCLASS_MAC: 726 if (len != 9) 727 break; 728 TCHECK(p[8]); 729 printf("MAC %02x:%02x:%02x:%02x:%02x:%02x", 730 p[3], p[4], p[5], p[6], p[7], p[8]); 731 break; 732 case MEDCLASS_MNB: 733 printf("Magic-Num-Block"); /* XXX */ 734 break; 735 case MEDCLASS_PSNDN: 736 printf("PSNDN"); /* XXX */ 737 break; 738 } 739 break; 740 741 /* XXX: to be supported */ 742 #if 0 743 case LCPOPT_DEP6: 744 case LCPOPT_FCSALT: 745 case LCPOPT_SDP: 746 case LCPOPT_NUMMODE: 747 case LCPOPT_DEP12: 748 case LCPOPT_DEP14: 749 case LCPOPT_DEP15: 750 case LCPOPT_DEP16: 751 case LCPOPT_MLSSNHF: 752 case LCPOPT_PROP: 753 case LCPOPT_DCEID: 754 case LCPOPT_MPP: 755 case LCPOPT_LCPAOPT: 756 case LCPOPT_COBS: 757 case LCPOPT_PE: 758 case LCPOPT_MLHF: 759 case LCPOPT_I18N: 760 case LCPOPT_SDLOS: 761 case LCPOPT_PPPMUX: 762 break; 763 #endif 764 default: 765 if(vflag<2) 766 print_unknown_data(&p[2],"\n\t ",len-2); 767 break; 768 } 769 770 if (vflag>1) 771 print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ 772 773 return len; 774 775 trunc: 776 printf("[|lcp]"); 777 return 0; 778 } 779 780 /* ML-PPP*/ 781 static const struct tok ppp_ml_flag_values[] = { 782 { 0x80, "begin" }, 783 { 0x40, "end" }, 784 { 0, NULL } 785 }; 786 787 static void 788 handle_mlppp(const u_char *p, int length) { 789 790 if (!eflag) 791 printf("MLPPP, "); 792 793 printf("seq 0x%03x, Flags [%s], length %u", 794 (EXTRACT_16BITS(p))&0x0fff, /* only support 12-Bit sequence space for now */ 795 bittok2str(ppp_ml_flag_values, "none", *p & 0xc0), 796 length); 797 798 return; 799 } 800 801 /* CHAP */ 802 static void 803 handle_chap(const u_char *p, int length) 804 { 805 u_int code, len; 806 int val_size, name_size, msg_size; 807 const u_char *p0; 808 int i; 809 810 p0 = p; 811 if (length < 1) { 812 printf("[|chap]"); 813 return; 814 } else if (length < 4) { 815 TCHECK(*p); 816 printf("[|chap 0x%02x]", *p); 817 return; 818 } 819 820 TCHECK(*p); 821 code = *p; 822 printf("CHAP, %s (0x%02x)", 823 tok2str(chapcode_values,"unknown",code), 824 code); 825 p++; 826 827 TCHECK(*p); 828 printf(", id %u", *p); /* ID */ 829 p++; 830 831 TCHECK2(*p, 2); 832 len = EXTRACT_16BITS(p); 833 p += 2; 834 835 /* 836 * Note that this is a generic CHAP decoding routine. Since we 837 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1, 838 * MS-CHAPv2) is used at this point, we can't decode packet 839 * specifically to each algorithms. Instead, we simply decode 840 * the GCD (Gratest Common Denominator) for all algorithms. 841 */ 842 switch (code) { 843 case CHAP_CHAL: 844 case CHAP_RESP: 845 if (length - (p - p0) < 1) 846 return; 847 TCHECK(*p); 848 val_size = *p; /* value size */ 849 p++; 850 if (length - (p - p0) < val_size) 851 return; 852 printf(", Value "); 853 for (i = 0; i < val_size; i++) { 854 TCHECK(*p); 855 printf("%02x", *p++); 856 } 857 name_size = len - (p - p0); 858 printf(", Name "); 859 for (i = 0; i < name_size; i++) { 860 TCHECK(*p); 861 safeputchar(*p++); 862 } 863 break; 864 case CHAP_SUCC: 865 case CHAP_FAIL: 866 msg_size = len - (p - p0); 867 printf(", Msg "); 868 for (i = 0; i< msg_size; i++) { 869 TCHECK(*p); 870 safeputchar(*p++); 871 } 872 break; 873 } 874 return; 875 876 trunc: 877 printf("[|chap]"); 878 } 879 880 /* PAP (see RFC 1334) */ 881 static void 882 handle_pap(const u_char *p, int length) 883 { 884 u_int code, len; 885 int peerid_len, passwd_len, msg_len; 886 const u_char *p0; 887 int i; 888 889 p0 = p; 890 if (length < 1) { 891 printf("[|pap]"); 892 return; 893 } else if (length < 4) { 894 TCHECK(*p); 895 printf("[|pap 0x%02x]", *p); 896 return; 897 } 898 899 TCHECK(*p); 900 code = *p; 901 printf("PAP, %s (0x%02x)", 902 tok2str(papcode_values,"unknown",code), 903 code); 904 p++; 905 906 TCHECK(*p); 907 printf(", id %u", *p); /* ID */ 908 p++; 909 910 TCHECK2(*p, 2); 911 len = EXTRACT_16BITS(p); 912 p += 2; 913 914 if ((int)len > length) { 915 printf(", length %u > packet size", len); 916 return; 917 } 918 length = len; 919 if (length < (p - p0)) { 920 printf(", length %u < PAP header length", length); 921 return; 922 } 923 924 switch (code) { 925 case PAP_AREQ: 926 if (length - (p - p0) < 1) 927 return; 928 TCHECK(*p); 929 peerid_len = *p; /* Peer-ID Length */ 930 p++; 931 if (length - (p - p0) < peerid_len) 932 return; 933 printf(", Peer "); 934 for (i = 0; i < peerid_len; i++) { 935 TCHECK(*p); 936 safeputchar(*p++); 937 } 938 939 if (length - (p - p0) < 1) 940 return; 941 TCHECK(*p); 942 passwd_len = *p; /* Password Length */ 943 p++; 944 if (length - (p - p0) < passwd_len) 945 return; 946 printf(", Name "); 947 for (i = 0; i < passwd_len; i++) { 948 TCHECK(*p); 949 safeputchar(*p++); 950 } 951 break; 952 case PAP_AACK: 953 case PAP_ANAK: 954 if (length - (p - p0) < 1) 955 return; 956 TCHECK(*p); 957 msg_len = *p; /* Msg-Length */ 958 p++; 959 if (length - (p - p0) < msg_len) 960 return; 961 printf(", Msg "); 962 for (i = 0; i< msg_len; i++) { 963 TCHECK(*p); 964 safeputchar(*p++); 965 } 966 break; 967 } 968 return; 969 970 trunc: 971 printf("[|pap]"); 972 } 973 974 /* BAP */ 975 static void 976 handle_bap(const u_char *p _U_, int length _U_) 977 { 978 /* XXX: to be supported!! */ 979 } 980 981 982 /* IPCP config options */ 983 static int 984 print_ipcp_config_options(const u_char *p, int length) 985 { 986 int len, opt; 987 u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen; 988 989 if (length < 2) 990 return 0; 991 TCHECK2(*p, 2); 992 len = p[1]; 993 opt = p[0]; 994 if (length < len) 995 return 0; 996 if (len < 2) { 997 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", 998 tok2str(ipcpopt_values,"unknown",opt), 999 opt, 1000 len); 1001 return 0; 1002 } 1003 1004 printf("\n\t %s Option (0x%02x), length %u: ", 1005 tok2str(ipcpopt_values,"unknown",opt), 1006 opt, 1007 len); 1008 1009 switch (opt) { 1010 case IPCPOPT_2ADDR: /* deprecated */ 1011 if (len != 10) 1012 goto invlen; 1013 TCHECK2(*(p + 6), 4); 1014 printf("src %s, dst %s", 1015 ipaddr_string(p + 2), 1016 ipaddr_string(p + 6)); 1017 break; 1018 case IPCPOPT_IPCOMP: 1019 if (len < 4) 1020 goto invlen; 1021 TCHECK2(*(p + 2), 2); 1022 compproto = EXTRACT_16BITS(p+2); 1023 1024 printf("%s (0x%02x):", 1025 tok2str(ipcpopt_compproto_values,"Unknown",compproto), 1026 compproto); 1027 1028 switch (compproto) { 1029 case PPP_VJC: 1030 /* XXX: VJ-Comp parameters should be decoded */ 1031 break; 1032 case IPCPOPT_IPCOMP_HDRCOMP: 1033 if (len < IPCPOPT_IPCOMP_MINLEN) 1034 goto invlen; 1035 1036 TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN); 1037 printf("\n\t TCP Space %u, non-TCP Space %u" \ 1038 ", maxPeriod %u, maxTime %u, maxHdr %u", 1039 EXTRACT_16BITS(p+4), 1040 EXTRACT_16BITS(p+6), 1041 EXTRACT_16BITS(p+8), 1042 EXTRACT_16BITS(p+10), 1043 EXTRACT_16BITS(p+12)); 1044 1045 /* suboptions present ? */ 1046 if (len > IPCPOPT_IPCOMP_MINLEN) { 1047 ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN; 1048 p += IPCPOPT_IPCOMP_MINLEN; 1049 1050 printf("\n\t Suboptions, length %u", ipcomp_subopttotallen); 1051 1052 while (ipcomp_subopttotallen >= 2) { 1053 TCHECK2(*p, 2); 1054 ipcomp_subopt = *p; 1055 ipcomp_suboptlen = *(p+1); 1056 1057 /* sanity check */ 1058 if (ipcomp_subopt == 0 || 1059 ipcomp_suboptlen == 0 ) 1060 break; 1061 1062 /* XXX: just display the suboptions for now */ 1063 printf("\n\t\t%s Suboption #%u, length %u", 1064 tok2str(ipcpopt_compproto_subopt_values, 1065 "Unknown", 1066 ipcomp_subopt), 1067 ipcomp_subopt, 1068 ipcomp_suboptlen); 1069 1070 ipcomp_subopttotallen -= ipcomp_suboptlen; 1071 p += ipcomp_suboptlen; 1072 } 1073 } 1074 break; 1075 default: 1076 break; 1077 } 1078 break; 1079 1080 case IPCPOPT_ADDR: /* those options share the same format - fall through */ 1081 case IPCPOPT_MOBILE4: 1082 case IPCPOPT_PRIDNS: 1083 case IPCPOPT_PRINBNS: 1084 case IPCPOPT_SECDNS: 1085 case IPCPOPT_SECNBNS: 1086 if (len != 6) 1087 goto invlen; 1088 TCHECK2(*(p + 2), 4); 1089 printf("%s", ipaddr_string(p + 2)); 1090 break; 1091 default: 1092 if(vflag<2) 1093 print_unknown_data(&p[2],"\n\t ",len-2); 1094 break; 1095 } 1096 if (vflag>1) 1097 print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ 1098 return len; 1099 1100 invlen: 1101 printf(", invalid-length-%d", opt); 1102 return 0; 1103 1104 trunc: 1105 printf("[|ipcp]"); 1106 return 0; 1107 } 1108 1109 /* IP6CP config options */ 1110 static int 1111 print_ip6cp_config_options(const u_char *p, int length) 1112 { 1113 int len, opt; 1114 1115 if (length < 2) 1116 return 0; 1117 TCHECK2(*p, 2); 1118 len = p[1]; 1119 opt = p[0]; 1120 if (length < len) 1121 return 0; 1122 if (len < 2) { 1123 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", 1124 tok2str(ip6cpopt_values,"unknown",opt), 1125 opt, 1126 len); 1127 return 0; 1128 } 1129 1130 printf("\n\t %s Option (0x%02x), length %u: ", 1131 tok2str(ip6cpopt_values,"unknown",opt), 1132 opt, 1133 len); 1134 1135 switch (opt) { 1136 case IP6CP_IFID: 1137 if (len != 10) 1138 goto invlen; 1139 TCHECK2(*(p + 2), 8); 1140 printf("%04x:%04x:%04x:%04x", 1141 EXTRACT_16BITS(p + 2), 1142 EXTRACT_16BITS(p + 4), 1143 EXTRACT_16BITS(p + 6), 1144 EXTRACT_16BITS(p + 8)); 1145 break; 1146 default: 1147 if(vflag<2) 1148 print_unknown_data(&p[2],"\n\t ",len-2); 1149 break; 1150 } 1151 if (vflag>1) 1152 print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ 1153 1154 return len; 1155 1156 invlen: 1157 printf(", invalid-length-%d", opt); 1158 return 0; 1159 1160 trunc: 1161 printf("[|ip6cp]"); 1162 return 0; 1163 } 1164 1165 1166 /* CCP config options */ 1167 static int 1168 print_ccp_config_options(const u_char *p, int length) 1169 { 1170 int len, opt; 1171 1172 if (length < 2) 1173 return 0; 1174 TCHECK2(*p, 2); 1175 len = p[1]; 1176 opt = p[0]; 1177 if (length < len) 1178 return 0; 1179 if (len < 2) { 1180 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", 1181 tok2str(ccpconfopts_values, "Unknown", opt), 1182 opt, 1183 len); 1184 return 0; 1185 } 1186 1187 printf("\n\t %s Option (0x%02x), length %u:", 1188 tok2str(ccpconfopts_values, "Unknown", opt), 1189 opt, 1190 len); 1191 1192 switch (opt) { 1193 /* fall through --> default: nothing supported yet */ 1194 case CCPOPT_OUI: 1195 case CCPOPT_PRED1: 1196 case CCPOPT_PRED2: 1197 case CCPOPT_PJUMP: 1198 case CCPOPT_HPPPC: 1199 case CCPOPT_STACLZS: 1200 case CCPOPT_MPPC: 1201 case CCPOPT_GFZA: 1202 case CCPOPT_V42BIS: 1203 case CCPOPT_BSDCOMP: 1204 case CCPOPT_LZSDCP: 1205 case CCPOPT_MVRCA: 1206 case CCPOPT_DEC: 1207 case CCPOPT_DEFLATE: 1208 case CCPOPT_RESV: 1209 default: 1210 if(vflag<2) 1211 print_unknown_data(&p[2],"\n\t ",len-2); 1212 break; 1213 } 1214 if (vflag>1) 1215 print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ 1216 1217 return len; 1218 1219 trunc: 1220 printf("[|ccp]"); 1221 return 0; 1222 } 1223 1224 /* BACP config options */ 1225 static int 1226 print_bacp_config_options(const u_char *p, int length) 1227 { 1228 int len, opt; 1229 1230 if (length < 2) 1231 return 0; 1232 TCHECK2(*p, 2); 1233 len = p[1]; 1234 opt = p[0]; 1235 if (length < len) 1236 return 0; 1237 if (len < 2) { 1238 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", 1239 tok2str(bacconfopts_values, "Unknown", opt), 1240 opt, 1241 len); 1242 return 0; 1243 } 1244 1245 printf("\n\t %s Option (0x%02x), length %u:", 1246 tok2str(bacconfopts_values, "Unknown", opt), 1247 opt, 1248 len); 1249 1250 switch (opt) { 1251 case BACPOPT_FPEER: 1252 TCHECK2(*(p + 2), 4); 1253 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2)); 1254 break; 1255 default: 1256 if(vflag<2) 1257 print_unknown_data(&p[2],"\n\t ",len-2); 1258 break; 1259 } 1260 if (vflag>1) 1261 print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ 1262 1263 return len; 1264 1265 trunc: 1266 printf("[|bacp]"); 1267 return 0; 1268 } 1269 1270 1271 static void 1272 ppp_hdlc(const u_char *p, int length) 1273 { 1274 u_char *b, *s, *t, c; 1275 int i, proto; 1276 const void *se; 1277 1278 b = (u_int8_t *)malloc(length); 1279 if (b == NULL) 1280 return; 1281 1282 /* 1283 * Unescape all the data into a temporary, private, buffer. 1284 * Do this so that we dont overwrite the original packet 1285 * contents. 1286 */ 1287 for (s = (u_char *)p, t = b, i = length; i > 0; i--) { 1288 c = *s++; 1289 if (c == 0x7d) { 1290 if (i > 1) { 1291 i--; 1292 c = *s++ ^ 0x20; 1293 } else 1294 continue; 1295 } 1296 *t++ = c; 1297 } 1298 1299 se = snapend; 1300 snapend = t; 1301 1302 /* now lets guess about the payload codepoint format */ 1303 proto = *b; /* start with a one-octet codepoint guess */ 1304 1305 switch (proto) { 1306 case PPP_IP: 1307 ip_print(gndo, b+1, t - b - 1); 1308 goto cleanup; 1309 #ifdef INET6 1310 case PPP_IPV6: 1311 ip6_print(gndo, b+1, t - b - 1); 1312 goto cleanup; 1313 #endif 1314 default: /* no luck - try next guess */ 1315 break; 1316 } 1317 1318 proto = EXTRACT_16BITS(b); /* next guess - load two octets */ 1319 1320 switch (proto) { 1321 case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */ 1322 proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */ 1323 handle_ppp(proto, b+4, t - b - 4); 1324 break; 1325 default: /* last guess - proto must be a PPP proto-id */ 1326 handle_ppp(proto, b+2, t - b - 2); 1327 break; 1328 } 1329 1330 cleanup: 1331 snapend = se; 1332 free(b); 1333 return; 1334 } 1335 1336 1337 /* PPP */ 1338 static void 1339 handle_ppp(u_int proto, const u_char *p, int length) 1340 { 1341 if ((proto & 0xff00) == 0x7e00) {/* is this an escape code ? */ 1342 ppp_hdlc(p-1, length); 1343 return; 1344 } 1345 1346 switch (proto) { 1347 case PPP_LCP: /* fall through */ 1348 case PPP_IPCP: 1349 case PPP_OSICP: 1350 case PPP_MPLSCP: 1351 case PPP_IPV6CP: 1352 case PPP_CCP: 1353 case PPP_BACP: 1354 handle_ctrl_proto(proto, p, length); 1355 break; 1356 case PPP_ML: 1357 handle_mlppp(p, length); 1358 break; 1359 case PPP_CHAP: 1360 handle_chap(p, length); 1361 break; 1362 case PPP_PAP: 1363 handle_pap(p, length); 1364 break; 1365 case PPP_BAP: /* XXX: not yet completed */ 1366 handle_bap(p, length); 1367 break; 1368 case ETHERTYPE_IP: /*XXX*/ 1369 case PPP_VJNC: 1370 case PPP_IP: 1371 ip_print(gndo, p, length); 1372 break; 1373 #ifdef INET6 1374 case ETHERTYPE_IPV6: /*XXX*/ 1375 case PPP_IPV6: 1376 ip6_print(gndo, p, length); 1377 break; 1378 #endif 1379 case ETHERTYPE_IPX: /*XXX*/ 1380 case PPP_IPX: 1381 ipx_print(p, length); 1382 break; 1383 case PPP_OSI: 1384 isoclns_print(p, length, length); 1385 break; 1386 case PPP_MPLS_UCAST: 1387 case PPP_MPLS_MCAST: 1388 mpls_print(p, length); 1389 break; 1390 case PPP_COMP: 1391 printf("compressed PPP data"); 1392 break; 1393 default: 1394 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); 1395 print_unknown_data(p,"\n\t",length); 1396 break; 1397 } 1398 } 1399 1400 /* Standard PPP printer */ 1401 u_int 1402 ppp_print(register const u_char *p, u_int length) 1403 { 1404 u_int proto,ppp_header; 1405 u_int olen = length; /* _o_riginal length */ 1406 u_int hdr_len = 0; 1407 1408 /* 1409 * Here, we assume that p points to the Address and Control 1410 * field (if they present). 1411 */ 1412 if (length < 2) 1413 goto trunc; 1414 TCHECK2(*p, 2); 1415 ppp_header = EXTRACT_16BITS(p); 1416 1417 switch(ppp_header) { 1418 case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL): 1419 if (eflag) printf("In "); 1420 p += 2; 1421 length -= 2; 1422 hdr_len += 2; 1423 break; 1424 case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL): 1425 if (eflag) printf("Out "); 1426 p += 2; 1427 length -= 2; 1428 hdr_len += 2; 1429 break; 1430 case (PPP_ADDRESS << 8 | PPP_CONTROL): 1431 p += 2; /* ACFC not used */ 1432 length -= 2; 1433 hdr_len += 2; 1434 break; 1435 1436 default: 1437 break; 1438 } 1439 1440 if (length < 2) 1441 goto trunc; 1442 TCHECK(*p); 1443 if (*p % 2) { 1444 proto = *p; /* PFC is used */ 1445 p++; 1446 length--; 1447 hdr_len++; 1448 } else { 1449 TCHECK2(*p, 2); 1450 proto = EXTRACT_16BITS(p); 1451 p += 2; 1452 length -= 2; 1453 hdr_len += 2; 1454 } 1455 1456 if (eflag) 1457 printf("%s (0x%04x), length %u: ", 1458 tok2str(ppptype2str, "unknown", proto), 1459 proto, 1460 olen); 1461 1462 handle_ppp(proto, p, length); 1463 return (hdr_len); 1464 trunc: 1465 printf("[|ppp]"); 1466 return (0); 1467 } 1468 1469 1470 /* PPP I/F printer */ 1471 u_int 1472 ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p) 1473 { 1474 register u_int length = h->len; 1475 register u_int caplen = h->caplen; 1476 1477 if (caplen < PPP_HDRLEN) { 1478 printf("[|ppp]"); 1479 return (caplen); 1480 } 1481 1482 #if 0 1483 /* 1484 * XXX: seems to assume that there are 2 octets prepended to an 1485 * actual PPP frame. The 1st octet looks like Input/Output flag 1486 * while 2nd octet is unknown, at least to me 1487 * (mshindo@mshindo.net). 1488 * 1489 * That was what the original tcpdump code did. 1490 * 1491 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound 1492 * packets and 0 for inbound packets - but only if the 1493 * protocol field has the 0x8000 bit set (i.e., it's a network 1494 * control protocol); it does so before running the packet through 1495 * "bpf_filter" to see if it should be discarded, and to see 1496 * if we should update the time we sent the most recent packet... 1497 * 1498 * ...but it puts the original address field back after doing 1499 * so. 1500 * 1501 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion. 1502 * 1503 * I don't know if any PPP implementation handed up to a BPF 1504 * device packets with the first octet being 1 for outbound and 1505 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know 1506 * whether that ever needs to be checked or not. 1507 * 1508 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP, 1509 * and its tcpdump appears to assume that the frame always 1510 * begins with an address field and a control field, and that 1511 * the address field might be 0x0f or 0x8f, for Cisco 1512 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1513 * 1547, as well as 0xff, for PPP in HDLC-like framing as per 1514 * RFC 1662. 1515 * 1516 * (Is the Cisco framing in question what DLT_C_HDLC, in 1517 * BSD/OS, is?) 1518 */ 1519 if (eflag) 1520 printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]); 1521 #endif 1522 1523 ppp_print(p, length); 1524 1525 return (0); 1526 } 1527 1528 /* 1529 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like 1530 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547, 1531 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL, 1532 * discard them *if* those are the first two octets, and parse the remaining 1533 * packet as a PPP packet, as "ppp_print()" does). 1534 * 1535 * This handles, for example, DLT_PPP_SERIAL in NetBSD. 1536 */ 1537 u_int 1538 ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p) 1539 { 1540 register u_int length = h->len; 1541 register u_int caplen = h->caplen; 1542 u_int proto; 1543 u_int hdrlen = 0; 1544 1545 if (caplen < 2) { 1546 printf("[|ppp]"); 1547 return (caplen); 1548 } 1549 1550 switch (p[0]) { 1551 1552 case PPP_ADDRESS: 1553 if (caplen < 4) { 1554 printf("[|ppp]"); 1555 return (caplen); 1556 } 1557 1558 if (eflag) 1559 printf("%02x %02x %d ", p[0], p[1], length); 1560 p += 2; 1561 length -= 2; 1562 hdrlen += 2; 1563 1564 proto = EXTRACT_16BITS(p); 1565 p += 2; 1566 length -= 2; 1567 hdrlen += 2; 1568 printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); 1569 1570 handle_ppp(proto, p, length); 1571 break; 1572 1573 case CHDLC_UNICAST: 1574 case CHDLC_BCAST: 1575 return (chdlc_if_print(h, p)); 1576 1577 default: 1578 if (eflag) 1579 printf("%02x %02x %d ", p[0], p[1], length); 1580 p += 2; 1581 length -= 2; 1582 hdrlen += 2; 1583 1584 /* 1585 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats 1586 * the next two octets as an Ethernet type; does that 1587 * ever happen? 1588 */ 1589 printf("unknown addr %02x; ctrl %02x", p[0], p[1]); 1590 break; 1591 } 1592 1593 return (hdrlen); 1594 } 1595 1596 #define PPP_BSDI_HDRLEN 24 1597 1598 /* BSD/OS specific PPP printer */ 1599 u_int 1600 ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_) 1601 { 1602 register int hdrlength; 1603 #ifdef __bsdi__ 1604 register u_int length = h->len; 1605 register u_int caplen = h->caplen; 1606 u_int16_t ptype; 1607 const u_char *q; 1608 int i; 1609 1610 if (caplen < PPP_BSDI_HDRLEN) { 1611 printf("[|ppp]"); 1612 return (caplen) 1613 } 1614 1615 hdrlength = 0; 1616 1617 #if 0 1618 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) { 1619 if (eflag) 1620 printf("%02x %02x ", p[0], p[1]); 1621 p += 2; 1622 hdrlength = 2; 1623 } 1624 1625 if (eflag) 1626 printf("%d ", length); 1627 /* Retrieve the protocol type */ 1628 if (*p & 01) { 1629 /* Compressed protocol field */ 1630 ptype = *p; 1631 if (eflag) 1632 printf("%02x ", ptype); 1633 p++; 1634 hdrlength += 1; 1635 } else { 1636 /* Un-compressed protocol field */ 1637 ptype = EXTRACT_16BITS(p); 1638 if (eflag) 1639 printf("%04x ", ptype); 1640 p += 2; 1641 hdrlength += 2; 1642 } 1643 #else 1644 ptype = 0; /*XXX*/ 1645 if (eflag) 1646 printf("%c ", p[SLC_DIR] ? 'O' : 'I'); 1647 if (p[SLC_LLHL]) { 1648 /* link level header */ 1649 struct ppp_header *ph; 1650 1651 q = p + SLC_BPFHDRLEN; 1652 ph = (struct ppp_header *)q; 1653 if (ph->phdr_addr == PPP_ADDRESS 1654 && ph->phdr_ctl == PPP_CONTROL) { 1655 if (eflag) 1656 printf("%02x %02x ", q[0], q[1]); 1657 ptype = EXTRACT_16BITS(&ph->phdr_type); 1658 if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) { 1659 printf("%s ", tok2str(ppptype2str, 1660 "proto-#%d", ptype)); 1661 } 1662 } else { 1663 if (eflag) { 1664 printf("LLH=["); 1665 for (i = 0; i < p[SLC_LLHL]; i++) 1666 printf("%02x", q[i]); 1667 printf("] "); 1668 } 1669 } 1670 } 1671 if (eflag) 1672 printf("%d ", length); 1673 if (p[SLC_CHL]) { 1674 q = p + SLC_BPFHDRLEN + p[SLC_LLHL]; 1675 1676 switch (ptype) { 1677 case PPP_VJC: 1678 ptype = vjc_print(q, ptype); 1679 hdrlength = PPP_BSDI_HDRLEN; 1680 p += hdrlength; 1681 switch (ptype) { 1682 case PPP_IP: 1683 ip_print(gndo, p, length); 1684 break; 1685 #ifdef INET6 1686 case PPP_IPV6: 1687 ip6_print(gndo, p, length); 1688 break; 1689 #endif 1690 case PPP_MPLS_UCAST: 1691 case PPP_MPLS_MCAST: 1692 mpls_print(p, length); 1693 break; 1694 } 1695 goto printx; 1696 case PPP_VJNC: 1697 ptype = vjc_print(q, ptype); 1698 hdrlength = PPP_BSDI_HDRLEN; 1699 p += hdrlength; 1700 switch (ptype) { 1701 case PPP_IP: 1702 ip_print(gndo, p, length); 1703 break; 1704 #ifdef INET6 1705 case PPP_IPV6: 1706 ip6_print(gndo, p, length); 1707 break; 1708 #endif 1709 case PPP_MPLS_UCAST: 1710 case PPP_MPLS_MCAST: 1711 mpls_print(p, length); 1712 break; 1713 } 1714 goto printx; 1715 default: 1716 if (eflag) { 1717 printf("CH=["); 1718 for (i = 0; i < p[SLC_LLHL]; i++) 1719 printf("%02x", q[i]); 1720 printf("] "); 1721 } 1722 break; 1723 } 1724 } 1725 1726 hdrlength = PPP_BSDI_HDRLEN; 1727 #endif 1728 1729 length -= hdrlength; 1730 p += hdrlength; 1731 1732 switch (ptype) { 1733 case PPP_IP: 1734 ip_print(p, length); 1735 break; 1736 #ifdef INET6 1737 case PPP_IPV6: 1738 ip6_print(gndo, p, length); 1739 break; 1740 #endif 1741 case PPP_MPLS_UCAST: 1742 case PPP_MPLS_MCAST: 1743 mpls_print(gndo, p, length); 1744 break; 1745 default: 1746 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype)); 1747 } 1748 1749 printx: 1750 #else /* __bsdi */ 1751 hdrlength = 0; 1752 #endif /* __bsdi__ */ 1753 return (hdrlength); 1754 } 1755 1756 1757 /* 1758 * Local Variables: 1759 * c-style: whitesmith 1760 * c-basic-offset: 8 1761 * End: 1762 */ 1763