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