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/* \summary: Point to Point Protocol (PPP) printer */ 26 27/* 28 * TODO: 29 * o resolve XXX as much as possible 30 * o MP support 31 * o BAP support 32 */ 33 34#ifdef HAVE_CONFIG_H 35#include <config.h> 36#endif 37 38#include "netdissect-stdinc.h" 39 40#ifdef __bsdi__ 41#include <net/slcompress.h> 42#include <net/if_ppp.h> 43#endif 44 45#include "netdissect.h" 46#include "extract.h" 47#include "addrtoname.h" 48#include "ppp.h" 49#include "chdlc.h" 50#include "ethertype.h" 51#include "oui.h" 52#include "netdissect-alloc.h" 53 54/* 55 * The following constants are defined by IANA. Please refer to 56 * https://www.isi.edu/in-notes/iana/assignments/ppp-numbers 57 * for the up-to-date information. 58 */ 59 60/* Protocol Codes defined in ppp.h */ 61 62static const struct tok ppptype2str[] = { 63 { PPP_IP, "IP" }, 64 { PPP_OSI, "OSI" }, 65 { PPP_NS, "NS" }, 66 { PPP_DECNET, "DECNET" }, 67 { PPP_APPLE, "APPLE" }, 68 { PPP_IPX, "IPX" }, 69 { PPP_VJC, "VJC IP" }, 70 { PPP_VJNC, "VJNC IP" }, 71 { PPP_BRPDU, "BRPDU" }, 72 { PPP_STII, "STII" }, 73 { PPP_VINES, "VINES" }, 74 { PPP_MPLS_UCAST, "MPLS" }, 75 { PPP_MPLS_MCAST, "MPLS" }, 76 { PPP_COMP, "Compressed"}, 77 { PPP_ML, "MLPPP"}, 78 { PPP_IPV6, "IP6"}, 79 80 { PPP_HELLO, "HELLO" }, 81 { PPP_LUXCOM, "LUXCOM" }, 82 { PPP_SNS, "SNS" }, 83 { PPP_IPCP, "IPCP" }, 84 { PPP_OSICP, "OSICP" }, 85 { PPP_NSCP, "NSCP" }, 86 { PPP_DECNETCP, "DECNETCP" }, 87 { PPP_APPLECP, "APPLECP" }, 88 { PPP_IPXCP, "IPXCP" }, 89 { PPP_STIICP, "STIICP" }, 90 { PPP_VINESCP, "VINESCP" }, 91 { PPP_IPV6CP, "IP6CP" }, 92 { PPP_MPLSCP, "MPLSCP" }, 93 94 { PPP_LCP, "LCP" }, 95 { PPP_PAP, "PAP" }, 96 { PPP_LQM, "LQM" }, 97 { PPP_CHAP, "CHAP" }, 98 { PPP_EAP, "EAP" }, 99 { PPP_SPAP, "SPAP" }, 100 { PPP_SPAP_OLD, "Old-SPAP" }, 101 { PPP_BACP, "BACP" }, 102 { PPP_BAP, "BAP" }, 103 { PPP_MPCP, "MLPPP-CP" }, 104 { PPP_CCP, "CCP" }, 105 { 0, NULL } 106}; 107 108/* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */ 109 110#define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */ 111#define CPCODES_CONF_REQ 1 /* Configure-Request */ 112#define CPCODES_CONF_ACK 2 /* Configure-Ack */ 113#define CPCODES_CONF_NAK 3 /* Configure-Nak */ 114#define CPCODES_CONF_REJ 4 /* Configure-Reject */ 115#define CPCODES_TERM_REQ 5 /* Terminate-Request */ 116#define CPCODES_TERM_ACK 6 /* Terminate-Ack */ 117#define CPCODES_CODE_REJ 7 /* Code-Reject */ 118#define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */ 119#define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */ 120#define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */ 121#define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */ 122#define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */ 123#define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */ 124#define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */ 125#define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */ 126 127static const struct tok cpcodes[] = { 128 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */ 129 {CPCODES_CONF_REQ, "Conf-Request"}, 130 {CPCODES_CONF_ACK, "Conf-Ack"}, 131 {CPCODES_CONF_NAK, "Conf-Nack"}, 132 {CPCODES_CONF_REJ, "Conf-Reject"}, 133 {CPCODES_TERM_REQ, "Term-Request"}, 134 {CPCODES_TERM_ACK, "Term-Ack"}, 135 {CPCODES_CODE_REJ, "Code-Reject"}, 136 {CPCODES_PROT_REJ, "Prot-Reject"}, 137 {CPCODES_ECHO_REQ, "Echo-Request"}, 138 {CPCODES_ECHO_RPL, "Echo-Reply"}, 139 {CPCODES_DISC_REQ, "Disc-Req"}, 140 {CPCODES_ID, "Ident"}, /* RFC1570 */ 141 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */ 142 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */ 143 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */ 144 {0, NULL} 145}; 146 147/* LCP Config Options */ 148 149#define LCPOPT_VEXT 0 150#define LCPOPT_MRU 1 151#define LCPOPT_ACCM 2 152#define LCPOPT_AP 3 153#define LCPOPT_QP 4 154#define LCPOPT_MN 5 155#define LCPOPT_DEP6 6 156#define LCPOPT_PFC 7 157#define LCPOPT_ACFC 8 158#define LCPOPT_FCSALT 9 159#define LCPOPT_SDP 10 160#define LCPOPT_NUMMODE 11 161#define LCPOPT_DEP12 12 162#define LCPOPT_CBACK 13 163#define LCPOPT_DEP14 14 164#define LCPOPT_DEP15 15 165#define LCPOPT_DEP16 16 166#define LCPOPT_MLMRRU 17 167#define LCPOPT_MLSSNHF 18 168#define LCPOPT_MLED 19 169#define LCPOPT_PROP 20 170#define LCPOPT_DCEID 21 171#define LCPOPT_MPP 22 172#define LCPOPT_LD 23 173#define LCPOPT_LCPAOPT 24 174#define LCPOPT_COBS 25 175#define LCPOPT_PE 26 176#define LCPOPT_MLHF 27 177#define LCPOPT_I18N 28 178#define LCPOPT_SDLOS 29 179#define LCPOPT_PPPMUX 30 180 181static const char *lcpconfopts[] = { 182 "Vend-Ext", /* (0) */ 183 "MRU", /* (1) */ 184 "ACCM", /* (2) */ 185 "Auth-Prot", /* (3) */ 186 "Qual-Prot", /* (4) */ 187 "Magic-Num", /* (5) */ 188 "deprecated(6)", /* used to be a Quality Protocol */ 189 "PFC", /* (7) */ 190 "ACFC", /* (8) */ 191 "FCS-Alt", /* (9) */ 192 "SDP", /* (10) */ 193 "Num-Mode", /* (11) */ 194 "deprecated(12)", /* used to be a Multi-Link-Procedure*/ 195 "Call-Back", /* (13) */ 196 "deprecated(14)", /* used to be a Connect-Time */ 197 "deprecated(15)", /* used to be a Compund-Frames */ 198 "deprecated(16)", /* used to be a Nominal-Data-Encap */ 199 "MRRU", /* (17) */ 200 "12-Bit seq #", /* (18) */ 201 "End-Disc", /* (19) */ 202 "Proprietary", /* (20) */ 203 "DCE-Id", /* (21) */ 204 "MP+", /* (22) */ 205 "Link-Disc", /* (23) */ 206 "LCP-Auth-Opt", /* (24) */ 207 "COBS", /* (25) */ 208 "Prefix-elision", /* (26) */ 209 "Multilink-header-Form",/* (27) */ 210 "I18N", /* (28) */ 211 "SDL-over-SONET/SDH", /* (29) */ 212 "PPP-Muxing", /* (30) */ 213}; 214 215#define NUM_LCPOPTS (sizeof(lcpconfopts) / sizeof(lcpconfopts[0])) 216 217/* 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 240static const struct tok ccpconfopts_values[] = { 241 { CCPOPT_OUI, "OUI" }, 242 { CCPOPT_PRED1, "Pred-1" }, 243 { CCPOPT_PRED2, "Pred-2" }, 244 { CCPOPT_PJUMP, "Puddle" }, 245 { CCPOPT_HPPPC, "HP-PPC" }, 246 { CCPOPT_STACLZS, "Stac-LZS" }, 247 { CCPOPT_MPPC, "MPPC" }, 248 { CCPOPT_GFZA, "Gand-FZA" }, 249 { CCPOPT_V42BIS, "V.42bis" }, 250 { CCPOPT_BSDCOMP, "BSD-Comp" }, 251 { CCPOPT_LZSDCP, "LZS-DCP" }, 252 { CCPOPT_MVRCA, "MVRCA" }, 253 { CCPOPT_DEC, "DEC" }, 254 { CCPOPT_DEFLATE, "Deflate" }, 255 { CCPOPT_RESV, "Reserved"}, 256 {0, NULL} 257}; 258 259/* BACP Config Options */ 260 261#define BACPOPT_FPEER 1 /* RFC2125 */ 262 263static const struct tok bacconfopts_values[] = { 264 { BACPOPT_FPEER, "Favored-Peer" }, 265 {0, NULL} 266}; 267 268 269/* SDCP - to be supported */ 270 271/* IPCP Config Options */ 272#define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */ 273#define IPCPOPT_IPCOMP 2 /* RFC1332 */ 274#define IPCPOPT_ADDR 3 /* RFC1332 */ 275#define IPCPOPT_MOBILE4 4 /* RFC2290 */ 276#define IPCPOPT_PRIDNS 129 /* RFC1877 */ 277#define IPCPOPT_PRINBNS 130 /* RFC1877 */ 278#define IPCPOPT_SECDNS 131 /* RFC1877 */ 279#define IPCPOPT_SECNBNS 132 /* RFC1877 */ 280 281static const struct tok ipcpopt_values[] = { 282 { IPCPOPT_2ADDR, "IP-Addrs" }, 283 { IPCPOPT_IPCOMP, "IP-Comp" }, 284 { IPCPOPT_ADDR, "IP-Addr" }, 285 { IPCPOPT_MOBILE4, "Home-Addr" }, 286 { IPCPOPT_PRIDNS, "Pri-DNS" }, 287 { IPCPOPT_PRINBNS, "Pri-NBNS" }, 288 { IPCPOPT_SECDNS, "Sec-DNS" }, 289 { IPCPOPT_SECNBNS, "Sec-NBNS" }, 290 { 0, NULL } 291}; 292 293#define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */ 294#define IPCPOPT_IPCOMP_MINLEN 14 295 296static const struct tok ipcpopt_compproto_values[] = { 297 { PPP_VJC, "VJ-Comp" }, 298 { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" }, 299 { 0, NULL } 300}; 301 302static const struct tok ipcpopt_compproto_subopt_values[] = { 303 { 1, "RTP-Compression" }, 304 { 2, "Enhanced RTP-Compression" }, 305 { 0, NULL } 306}; 307 308/* IP6CP Config Options */ 309#define IP6CP_IFID 1 310 311static const struct tok ip6cpopt_values[] = { 312 { IP6CP_IFID, "Interface-ID" }, 313 { 0, NULL } 314}; 315 316/* ATCP - to be supported */ 317/* OSINLCP - to be supported */ 318/* BVCP - to be supported */ 319/* BCP - to be supported */ 320/* IPXCP - to be supported */ 321/* MPLSCP - to be supported */ 322 323/* Auth Algorithms */ 324 325/* 0-4 Reserved (RFC1994) */ 326#define AUTHALG_CHAPMD5 5 /* RFC1994 */ 327#define AUTHALG_MSCHAP1 128 /* RFC2433 */ 328#define AUTHALG_MSCHAP2 129 /* RFC2795 */ 329 330static const struct tok authalg_values[] = { 331 { AUTHALG_CHAPMD5, "MD5" }, 332 { AUTHALG_MSCHAP1, "MS-CHAPv1" }, 333 { AUTHALG_MSCHAP2, "MS-CHAPv2" }, 334 { 0, NULL } 335}; 336 337/* FCS Alternatives - to be supported */ 338 339/* Multilink Endpoint Discriminator (RFC1717) */ 340#define MEDCLASS_NULL 0 /* Null Class */ 341#define MEDCLASS_LOCAL 1 /* Locally Assigned */ 342#define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */ 343#define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */ 344#define MEDCLASS_MNB 4 /* PPP Magic Number Block */ 345#define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */ 346 347/* PPP LCP Callback */ 348#define CALLBACK_AUTH 0 /* Location determined by user auth */ 349#define CALLBACK_DSTR 1 /* Dialing string */ 350#define CALLBACK_LID 2 /* Location identifier */ 351#define CALLBACK_E164 3 /* E.164 number */ 352#define CALLBACK_X500 4 /* X.500 distinguished name */ 353#define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */ 354 355static const struct tok ppp_callback_values[] = { 356 { CALLBACK_AUTH, "UserAuth" }, 357 { CALLBACK_DSTR, "DialString" }, 358 { CALLBACK_LID, "LocalID" }, 359 { CALLBACK_E164, "E.164" }, 360 { CALLBACK_X500, "X.500" }, 361 { CALLBACK_CBCP, "CBCP" }, 362 { 0, NULL } 363}; 364 365/* CHAP */ 366 367#define CHAP_CHAL 1 368#define CHAP_RESP 2 369#define CHAP_SUCC 3 370#define CHAP_FAIL 4 371 372static const struct tok chapcode_values[] = { 373 { CHAP_CHAL, "Challenge" }, 374 { CHAP_RESP, "Response" }, 375 { CHAP_SUCC, "Success" }, 376 { CHAP_FAIL, "Fail" }, 377 { 0, NULL} 378}; 379 380/* PAP */ 381 382#define PAP_AREQ 1 383#define PAP_AACK 2 384#define PAP_ANAK 3 385 386static const struct tok papcode_values[] = { 387 { PAP_AREQ, "Auth-Req" }, 388 { PAP_AACK, "Auth-ACK" }, 389 { PAP_ANAK, "Auth-NACK" }, 390 { 0, NULL } 391}; 392 393/* BAP */ 394#define BAP_CALLREQ 1 395#define BAP_CALLRES 2 396#define BAP_CBREQ 3 397#define BAP_CBRES 4 398#define BAP_LDQREQ 5 399#define BAP_LDQRES 6 400#define BAP_CSIND 7 401#define BAP_CSRES 8 402 403static u_int print_lcp_config_options(netdissect_options *, const u_char *p, u_int); 404static u_int print_ipcp_config_options(netdissect_options *, const u_char *p, u_int); 405static u_int print_ip6cp_config_options(netdissect_options *, const u_char *p, u_int); 406static u_int print_ccp_config_options(netdissect_options *, const u_char *p, u_int); 407static u_int print_bacp_config_options(netdissect_options *, const u_char *p, u_int); 408static void handle_ppp(netdissect_options *, u_int proto, const u_char *p, u_int length); 409 410/* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */ 411static void 412handle_ctrl_proto(netdissect_options *ndo, 413 u_int proto, const u_char *pptr, u_int length) 414{ 415 const char *typestr; 416 u_int code, len; 417 u_int (*pfunc)(netdissect_options *, const u_char *, u_int); 418 u_int tlen, advance; 419 const u_char *tptr; 420 421 tptr=pptr; 422 423 typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto); 424 ND_PRINT("%s, ", typestr); 425 426 if (length < 4) /* FIXME weak boundary checking */ 427 goto trunc; 428 ND_TCHECK_2(tptr); 429 430 code = GET_U_1(tptr); 431 tptr++; 432 433 ND_PRINT("%s (0x%02x), id %u, length %u", 434 tok2str(cpcodes, "Unknown Opcode",code), 435 code, 436 GET_U_1(tptr), /* ID */ 437 length + 2); 438 tptr++; 439 440 if (!ndo->ndo_vflag) 441 return; 442 443 len = GET_BE_U_2(tptr); 444 tptr += 2; 445 446 if (len < 4) { 447 ND_PRINT("\n\tencoded length %u (< 4))", len); 448 return; 449 } 450 451 if (len > length) { 452 ND_PRINT("\n\tencoded length %u (> packet length %u))", len, length); 453 return; 454 } 455 length = len; 456 457 ND_PRINT("\n\tencoded length %u (=Option(s) length %u)", len, len - 4); 458 459 if (length == 4) 460 return; /* there may be a NULL confreq etc. */ 461 462 if (ndo->ndo_vflag > 1) 463 print_unknown_data(ndo, pptr - 2, "\n\t", 6); 464 465 466 switch (code) { 467 case CPCODES_VEXT: 468 if (length < 11) 469 break; 470 ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr)); 471 tptr += 4; 472 ND_PRINT(" Vendor: %s (%u)", 473 tok2str(oui_values,"Unknown",GET_BE_U_3(tptr)), 474 GET_BE_U_3(tptr)); 475 /* XXX: need to decode Kind and Value(s)? */ 476 break; 477 case CPCODES_CONF_REQ: 478 case CPCODES_CONF_ACK: 479 case CPCODES_CONF_NAK: 480 case CPCODES_CONF_REJ: 481 tlen = len - 4; /* Code(1), Identifier(1) and Length(2) */ 482 do { 483 switch (proto) { 484 case PPP_LCP: 485 pfunc = print_lcp_config_options; 486 break; 487 case PPP_IPCP: 488 pfunc = print_ipcp_config_options; 489 break; 490 case PPP_IPV6CP: 491 pfunc = print_ip6cp_config_options; 492 break; 493 case PPP_CCP: 494 pfunc = print_ccp_config_options; 495 break; 496 case PPP_BACP: 497 pfunc = print_bacp_config_options; 498 break; 499 default: 500 /* 501 * No print routine for the options for 502 * this protocol. 503 */ 504 pfunc = NULL; 505 break; 506 } 507 508 if (pfunc == NULL) /* catch the above null pointer if unknown CP */ 509 break; 510 511 if ((advance = (*pfunc)(ndo, tptr, len)) == 0) 512 break; 513 if (tlen < advance) { 514 ND_PRINT(" [remaining options length %u < %u]", 515 tlen, advance); 516 nd_print_invalid(ndo); 517 break; 518 } 519 tlen -= advance; 520 tptr += advance; 521 } while (tlen != 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 ND_PRINT("\n\t Rejected %s Protocol (0x%04x)", 535 tok2str(ppptype2str,"unknown", GET_BE_U_2(tptr)), 536 GET_BE_U_2(tptr)); 537 /* XXX: need to decode Rejected-Information? - hexdump for now */ 538 if (len > 6) { 539 ND_PRINT("\n\t Rejected Packet"); 540 print_unknown_data(ndo, tptr + 2, "\n\t ", len - 2); 541 } 542 break; 543 case CPCODES_ECHO_REQ: 544 case CPCODES_ECHO_RPL: 545 case CPCODES_DISC_REQ: 546 if (length < 8) 547 break; 548 ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr)); 549 /* XXX: need to decode Data? - hexdump for now */ 550 if (len > 8) { 551 ND_PRINT("\n\t -----trailing data-----"); 552 ND_TCHECK_LEN(tptr + 4, len - 8); 553 print_unknown_data(ndo, tptr + 4, "\n\t ", len - 8); 554 } 555 break; 556 case CPCODES_ID: 557 if (length < 8) 558 break; 559 ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr)); 560 /* RFC 1661 says this is intended to be human readable */ 561 if (len > 8) { 562 ND_PRINT("\n\t Message\n\t "); 563 if (nd_printn(ndo, tptr + 4, len - 4, ndo->ndo_snapend)) 564 goto trunc; 565 } 566 break; 567 case CPCODES_TIME_REM: 568 if (length < 12) 569 break; 570 ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr)); 571 ND_PRINT(", Seconds-Remaining %us", GET_BE_U_4(tptr + 4)); 572 /* XXX: need to decode Message? */ 573 break; 574 default: 575 /* XXX this is dirty but we do not get the 576 * original pointer passed to the begin 577 * the PPP packet */ 578 if (ndo->ndo_vflag <= 1) 579 print_unknown_data(ndo, pptr - 2, "\n\t ", length + 2); 580 break; 581 } 582 return; 583 584trunc: 585 ND_PRINT("[|%s]", typestr); 586} 587 588/* LCP config options */ 589static u_int 590print_lcp_config_options(netdissect_options *ndo, 591 const u_char *p, u_int length) 592{ 593 u_int opt, len; 594 595 if (length < 2) 596 return 0; 597 ND_TCHECK_2(p); 598 opt = GET_U_1(p); 599 len = GET_U_1(p + 1); 600 if (length < len) 601 return 0; 602 if (len < 2) { 603 if (opt < NUM_LCPOPTS) 604 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 605 lcpconfopts[opt], opt, len); 606 else 607 ND_PRINT("\n\tunknown LCP option 0x%02x", opt); 608 return 0; 609 } 610 if (opt < NUM_LCPOPTS) 611 ND_PRINT("\n\t %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len); 612 else { 613 ND_PRINT("\n\tunknown LCP option 0x%02x", opt); 614 return len; 615 } 616 617 switch (opt) { 618 case LCPOPT_VEXT: 619 if (len < 6) { 620 ND_PRINT(" (length bogus, should be >= 6)"); 621 return len; 622 } 623 ND_PRINT(": Vendor: %s (%u)", 624 tok2str(oui_values,"Unknown",GET_BE_U_3(p + 2)), 625 GET_BE_U_3(p + 2)); 626#if 0 627 ND_PRINT(", kind: 0x%02x", GET_U_1(p + 5)); 628 ND_PRINT(", Value: 0x"); 629 for (i = 0; i < len - 6; i++) { 630 ND_PRINT("%02x", GET_U_1(p + 6 + i)); 631 } 632#endif 633 break; 634 case LCPOPT_MRU: 635 if (len != 4) { 636 ND_PRINT(" (length bogus, should be = 4)"); 637 return len; 638 } 639 ND_PRINT(": %u", GET_BE_U_2(p + 2)); 640 break; 641 case LCPOPT_ACCM: 642 if (len != 6) { 643 ND_PRINT(" (length bogus, should be = 6)"); 644 return len; 645 } 646 ND_PRINT(": 0x%08x", GET_BE_U_4(p + 2)); 647 break; 648 case LCPOPT_AP: 649 if (len < 4) { 650 ND_PRINT(" (length bogus, should be >= 4)"); 651 return len; 652 } 653 ND_PRINT(": %s", 654 tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", GET_BE_U_2(p + 2))); 655 656 switch (GET_BE_U_2(p + 2)) { 657 case PPP_CHAP: 658 ND_PRINT(", %s", 659 tok2str(authalg_values, "Unknown Auth Alg %u", GET_U_1(p + 4))); 660 break; 661 case PPP_PAP: /* fall through */ 662 case PPP_EAP: 663 case PPP_SPAP: 664 case PPP_SPAP_OLD: 665 break; 666 default: 667 print_unknown_data(ndo, p, "\n\t", len); 668 } 669 break; 670 case LCPOPT_QP: 671 if (len < 4) { 672 ND_PRINT(" (length bogus, should be >= 4)"); 673 return 0; 674 } 675 if (GET_BE_U_2(p + 2) == PPP_LQM) 676 ND_PRINT(": LQR"); 677 else 678 ND_PRINT(": unknown"); 679 break; 680 case LCPOPT_MN: 681 if (len != 6) { 682 ND_PRINT(" (length bogus, should be = 6)"); 683 return 0; 684 } 685 ND_PRINT(": 0x%08x", GET_BE_U_4(p + 2)); 686 break; 687 case LCPOPT_PFC: 688 break; 689 case LCPOPT_ACFC: 690 break; 691 case LCPOPT_LD: 692 if (len != 4) { 693 ND_PRINT(" (length bogus, should be = 4)"); 694 return 0; 695 } 696 ND_PRINT(": 0x%04x", GET_BE_U_2(p + 2)); 697 break; 698 case LCPOPT_CBACK: 699 if (len < 3) { 700 ND_PRINT(" (length bogus, should be >= 3)"); 701 return 0; 702 } 703 ND_PRINT(": "); 704 ND_PRINT(": Callback Operation %s (%u)", 705 tok2str(ppp_callback_values, "Unknown", GET_U_1(p + 2)), 706 GET_U_1(p + 2)); 707 break; 708 case LCPOPT_MLMRRU: 709 if (len != 4) { 710 ND_PRINT(" (length bogus, should be = 4)"); 711 return 0; 712 } 713 ND_PRINT(": %u", GET_BE_U_2(p + 2)); 714 break; 715 case LCPOPT_MLED: 716 if (len < 3) { 717 ND_PRINT(" (length bogus, should be >= 3)"); 718 return 0; 719 } 720 switch (GET_U_1(p + 2)) { /* class */ 721 case MEDCLASS_NULL: 722 ND_PRINT(": Null"); 723 break; 724 case MEDCLASS_LOCAL: 725 ND_PRINT(": Local"); /* XXX */ 726 break; 727 case MEDCLASS_IPV4: 728 if (len != 7) { 729 ND_PRINT(" (length bogus, should be = 7)"); 730 return 0; 731 } 732 ND_PRINT(": IPv4 %s", GET_IPADDR_STRING(p + 3)); 733 break; 734 case MEDCLASS_MAC: 735 if (len != 9) { 736 ND_PRINT(" (length bogus, should be = 9)"); 737 return 0; 738 } 739 ND_PRINT(": MAC %s", GET_ETHERADDR_STRING(p + 3)); 740 break; 741 case MEDCLASS_MNB: 742 ND_PRINT(": Magic-Num-Block"); /* XXX */ 743 break; 744 case MEDCLASS_PSNDN: 745 ND_PRINT(": PSNDN"); /* XXX */ 746 break; 747 default: 748 ND_PRINT(": Unknown class %u", GET_U_1(p + 2)); 749 break; 750 } 751 break; 752 753/* XXX: to be supported */ 754#if 0 755 case LCPOPT_DEP6: 756 case LCPOPT_FCSALT: 757 case LCPOPT_SDP: 758 case LCPOPT_NUMMODE: 759 case LCPOPT_DEP12: 760 case LCPOPT_DEP14: 761 case LCPOPT_DEP15: 762 case LCPOPT_DEP16: 763 case LCPOPT_MLSSNHF: 764 case LCPOPT_PROP: 765 case LCPOPT_DCEID: 766 case LCPOPT_MPP: 767 case LCPOPT_LCPAOPT: 768 case LCPOPT_COBS: 769 case LCPOPT_PE: 770 case LCPOPT_MLHF: 771 case LCPOPT_I18N: 772 case LCPOPT_SDLOS: 773 case LCPOPT_PPPMUX: 774 break; 775#endif 776 default: 777 /* 778 * Unknown option; dump it as raw bytes now if we're 779 * not going to do so below. 780 */ 781 if (ndo->ndo_vflag < 2) 782 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); 783 break; 784 } 785 786 if (ndo->ndo_vflag > 1) 787 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */ 788 789 return len; 790 791trunc: 792 ND_PRINT("[|lcp]"); 793 return 0; 794} 795 796/* ML-PPP*/ 797static const struct tok ppp_ml_flag_values[] = { 798 { 0x80, "begin" }, 799 { 0x40, "end" }, 800 { 0, NULL } 801}; 802 803static void 804handle_mlppp(netdissect_options *ndo, 805 const u_char *p, u_int length) 806{ 807 if (!ndo->ndo_eflag) 808 ND_PRINT("MLPPP, "); 809 810 if (length < 2) { 811 ND_PRINT("[|mlppp]"); 812 return; 813 } 814 if (!ND_TTEST_2(p)) { 815 ND_PRINT("[|mlppp]"); 816 return; 817 } 818 819 ND_PRINT("seq 0x%03x, Flags [%s], length %u", 820 (GET_BE_U_2(p))&0x0fff, 821 /* only support 12-Bit sequence space for now */ 822 bittok2str(ppp_ml_flag_values, "none", GET_U_1(p) & 0xc0), 823 length); 824} 825 826/* CHAP */ 827static void 828handle_chap(netdissect_options *ndo, 829 const u_char *p, u_int length) 830{ 831 u_int code, len; 832 u_int val_size, name_size, msg_size; 833 const u_char *p0; 834 u_int i; 835 836 p0 = p; 837 if (length < 1) { 838 ND_PRINT("[|chap]"); 839 return; 840 } else if (length < 4) { 841 ND_PRINT("[|chap 0x%02x]", GET_U_1(p)); 842 return; 843 } 844 845 code = GET_U_1(p); 846 ND_PRINT("CHAP, %s (0x%02x)", 847 tok2str(chapcode_values,"unknown",code), 848 code); 849 p++; 850 851 ND_PRINT(", id %u", GET_U_1(p)); /* ID */ 852 p++; 853 854 len = GET_BE_U_2(p); 855 p += 2; 856 857 /* 858 * Note that this is a generic CHAP decoding routine. Since we 859 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1, 860 * MS-CHAPv2) is used at this point, we can't decode packet 861 * specifically to each algorithms. Instead, we simply decode 862 * the GCD (Gratest Common Denominator) for all algorithms. 863 */ 864 switch (code) { 865 case CHAP_CHAL: 866 case CHAP_RESP: 867 if (length - (p - p0) < 1) 868 return; 869 val_size = GET_U_1(p); /* value size */ 870 p++; 871 if (length - (p - p0) < val_size) 872 return; 873 ND_PRINT(", Value "); 874 for (i = 0; i < val_size; i++) { 875 ND_PRINT("%02x", GET_U_1(p)); 876 p++; 877 } 878 name_size = len - (u_int)(p - p0); 879 ND_PRINT(", Name "); 880 for (i = 0; i < name_size; i++) { 881 fn_print_char(ndo, GET_U_1(p)); 882 p++; 883 } 884 break; 885 case CHAP_SUCC: 886 case CHAP_FAIL: 887 msg_size = len - (u_int)(p - p0); 888 ND_PRINT(", Msg "); 889 for (i = 0; i< msg_size; i++) { 890 fn_print_char(ndo, GET_U_1(p)); 891 p++; 892 } 893 break; 894 } 895} 896 897/* PAP (see RFC 1334) */ 898static void 899handle_pap(netdissect_options *ndo, 900 const u_char *p, u_int length) 901{ 902 u_int code, len; 903 u_int peerid_len, passwd_len, msg_len; 904 const u_char *p0; 905 u_int i; 906 907 p0 = p; 908 if (length < 1) { 909 ND_PRINT("[|pap]"); 910 return; 911 } else if (length < 4) { 912 ND_PRINT("[|pap 0x%02x]", GET_U_1(p)); 913 return; 914 } 915 916 code = GET_U_1(p); 917 ND_PRINT("PAP, %s (0x%02x)", 918 tok2str(papcode_values, "unknown", code), 919 code); 920 p++; 921 922 ND_PRINT(", id %u", GET_U_1(p)); /* ID */ 923 p++; 924 925 len = GET_BE_U_2(p); 926 p += 2; 927 928 if (len > length) { 929 ND_PRINT(", length %u > packet size", len); 930 return; 931 } 932 length = len; 933 if (length < (size_t)(p - p0)) { 934 ND_PRINT(", length %u < PAP header length", length); 935 return; 936 } 937 938 switch (code) { 939 case PAP_AREQ: 940 /* A valid Authenticate-Request is 6 or more octets long. */ 941 if (len < 6) 942 goto trunc; 943 if (length - (p - p0) < 1) 944 return; 945 peerid_len = GET_U_1(p); /* Peer-ID Length */ 946 p++; 947 if (length - (p - p0) < peerid_len) 948 return; 949 ND_PRINT(", Peer "); 950 for (i = 0; i < peerid_len; i++) { 951 fn_print_char(ndo, GET_U_1(p)); 952 p++; 953 } 954 955 if (length - (p - p0) < 1) 956 return; 957 passwd_len = GET_U_1(p); /* Password Length */ 958 p++; 959 if (length - (p - p0) < passwd_len) 960 return; 961 ND_PRINT(", Name "); 962 for (i = 0; i < passwd_len; i++) { 963 fn_print_char(ndo, GET_U_1(p)); 964 p++; 965 } 966 break; 967 case PAP_AACK: 968 case PAP_ANAK: 969 /* Although some implementations ignore truncation at 970 * this point and at least one generates a truncated 971 * packet, RFC 1334 section 2.2.2 clearly states that 972 * both AACK and ANAK are at least 5 bytes long. 973 */ 974 if (len < 5) 975 goto trunc; 976 if (length - (p - p0) < 1) 977 return; 978 msg_len = GET_U_1(p); /* Msg-Length */ 979 p++; 980 if (length - (p - p0) < msg_len) 981 return; 982 ND_PRINT(", Msg "); 983 for (i = 0; i< msg_len; i++) { 984 fn_print_char(ndo, GET_U_1(p)); 985 p++; 986 } 987 break; 988 } 989 return; 990 991trunc: 992 ND_PRINT("[|pap]"); 993} 994 995/* BAP */ 996static void 997handle_bap(netdissect_options *ndo _U_, 998 const u_char *p _U_, u_int length _U_) 999{ 1000 /* XXX: to be supported!! */ 1001} 1002 1003 1004/* IPCP config options */ 1005static u_int 1006print_ipcp_config_options(netdissect_options *ndo, 1007 const u_char *p, u_int length) 1008{ 1009 u_int opt, len; 1010 u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen; 1011 1012 if (length < 2) 1013 return 0; 1014 ND_TCHECK_2(p); 1015 opt = GET_U_1(p); 1016 len = GET_U_1(p + 1); 1017 if (length < len) 1018 return 0; 1019 if (len < 2) { 1020 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1021 tok2str(ipcpopt_values,"unknown",opt), 1022 opt, 1023 len); 1024 return 0; 1025 } 1026 1027 ND_PRINT("\n\t %s Option (0x%02x), length %u", 1028 tok2str(ipcpopt_values,"unknown",opt), 1029 opt, 1030 len); 1031 1032 switch (opt) { 1033 case IPCPOPT_2ADDR: /* deprecated */ 1034 if (len != 10) { 1035 ND_PRINT(" (length bogus, should be = 10)"); 1036 return len; 1037 } 1038 ND_PRINT(": src %s, dst %s", 1039 GET_IPADDR_STRING(p + 2), 1040 GET_IPADDR_STRING(p + 6)); 1041 break; 1042 case IPCPOPT_IPCOMP: 1043 if (len < 4) { 1044 ND_PRINT(" (length bogus, should be >= 4)"); 1045 return 0; 1046 } 1047 compproto = GET_BE_U_2(p + 2); 1048 1049 ND_PRINT(": %s (0x%02x):", 1050 tok2str(ipcpopt_compproto_values, "Unknown", compproto), 1051 compproto); 1052 1053 switch (compproto) { 1054 case PPP_VJC: 1055 /* XXX: VJ-Comp parameters should be decoded */ 1056 break; 1057 case IPCPOPT_IPCOMP_HDRCOMP: 1058 if (len < IPCPOPT_IPCOMP_MINLEN) { 1059 ND_PRINT(" (length bogus, should be >= %u)", 1060 IPCPOPT_IPCOMP_MINLEN); 1061 return 0; 1062 } 1063 1064 ND_TCHECK_LEN(p + 2, IPCPOPT_IPCOMP_MINLEN); 1065 ND_PRINT("\n\t TCP Space %u, non-TCP Space %u" 1066 ", maxPeriod %u, maxTime %u, maxHdr %u", 1067 GET_BE_U_2(p + 4), 1068 GET_BE_U_2(p + 6), 1069 GET_BE_U_2(p + 8), 1070 GET_BE_U_2(p + 10), 1071 GET_BE_U_2(p + 12)); 1072 1073 /* suboptions present ? */ 1074 if (len > IPCPOPT_IPCOMP_MINLEN) { 1075 ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN; 1076 p += IPCPOPT_IPCOMP_MINLEN; 1077 1078 ND_PRINT("\n\t Suboptions, length %u", ipcomp_subopttotallen); 1079 1080 while (ipcomp_subopttotallen >= 2) { 1081 ND_TCHECK_2(p); 1082 ipcomp_subopt = GET_U_1(p); 1083 ipcomp_suboptlen = GET_U_1(p + 1); 1084 1085 /* sanity check */ 1086 if (ipcomp_subopt == 0 || 1087 ipcomp_suboptlen == 0 ) 1088 break; 1089 1090 /* XXX: just display the suboptions for now */ 1091 ND_PRINT("\n\t\t%s Suboption #%u, length %u", 1092 tok2str(ipcpopt_compproto_subopt_values, 1093 "Unknown", 1094 ipcomp_subopt), 1095 ipcomp_subopt, 1096 ipcomp_suboptlen); 1097 if (ipcomp_subopttotallen < ipcomp_suboptlen) { 1098 ND_PRINT(" [remaining suboptions length %u < %u]", 1099 ipcomp_subopttotallen, ipcomp_suboptlen); 1100 nd_print_invalid(ndo); 1101 break; 1102 } 1103 ipcomp_subopttotallen -= ipcomp_suboptlen; 1104 p += ipcomp_suboptlen; 1105 } 1106 } 1107 break; 1108 default: 1109 break; 1110 } 1111 break; 1112 1113 case IPCPOPT_ADDR: /* those options share the same format - fall through */ 1114 case IPCPOPT_MOBILE4: 1115 case IPCPOPT_PRIDNS: 1116 case IPCPOPT_PRINBNS: 1117 case IPCPOPT_SECDNS: 1118 case IPCPOPT_SECNBNS: 1119 if (len != 6) { 1120 ND_PRINT(" (length bogus, should be = 6)"); 1121 return 0; 1122 } 1123 ND_PRINT(": %s", GET_IPADDR_STRING(p + 2)); 1124 break; 1125 default: 1126 /* 1127 * Unknown option; dump it as raw bytes now if we're 1128 * not going to do so below. 1129 */ 1130 if (ndo->ndo_vflag < 2) 1131 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); 1132 break; 1133 } 1134 if (ndo->ndo_vflag > 1) 1135 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */ 1136 return len; 1137 1138trunc: 1139 ND_PRINT("[|ipcp]"); 1140 return 0; 1141} 1142 1143/* IP6CP config options */ 1144static u_int 1145print_ip6cp_config_options(netdissect_options *ndo, 1146 const u_char *p, u_int length) 1147{ 1148 u_int opt, len; 1149 1150 if (length < 2) 1151 return 0; 1152 ND_TCHECK_2(p); 1153 opt = GET_U_1(p); 1154 len = GET_U_1(p + 1); 1155 if (length < len) 1156 return 0; 1157 if (len < 2) { 1158 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1159 tok2str(ip6cpopt_values,"unknown",opt), 1160 opt, 1161 len); 1162 return 0; 1163 } 1164 1165 ND_PRINT("\n\t %s Option (0x%02x), length %u", 1166 tok2str(ip6cpopt_values,"unknown",opt), 1167 opt, 1168 len); 1169 1170 switch (opt) { 1171 case IP6CP_IFID: 1172 if (len != 10) { 1173 ND_PRINT(" (length bogus, should be = 10)"); 1174 return len; 1175 } 1176 ND_TCHECK_8(p + 2); 1177 ND_PRINT(": %04x:%04x:%04x:%04x", 1178 GET_BE_U_2(p + 2), 1179 GET_BE_U_2(p + 4), 1180 GET_BE_U_2(p + 6), 1181 GET_BE_U_2(p + 8)); 1182 break; 1183 default: 1184 /* 1185 * Unknown option; dump it as raw bytes now if we're 1186 * not going to do so below. 1187 */ 1188 if (ndo->ndo_vflag < 2) 1189 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); 1190 break; 1191 } 1192 if (ndo->ndo_vflag > 1) 1193 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */ 1194 1195 return len; 1196 1197trunc: 1198 ND_PRINT("[|ip6cp]"); 1199 return 0; 1200} 1201 1202 1203/* CCP config options */ 1204static u_int 1205print_ccp_config_options(netdissect_options *ndo, 1206 const u_char *p, u_int length) 1207{ 1208 u_int opt, len; 1209 1210 if (length < 2) 1211 return 0; 1212 ND_TCHECK_2(p); 1213 opt = GET_U_1(p); 1214 len = GET_U_1(p + 1); 1215 if (length < len) 1216 return 0; 1217 if (len < 2) { 1218 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1219 tok2str(ccpconfopts_values, "Unknown", opt), 1220 opt, 1221 len); 1222 return 0; 1223 } 1224 1225 ND_PRINT("\n\t %s Option (0x%02x), length %u", 1226 tok2str(ccpconfopts_values, "Unknown", opt), 1227 opt, 1228 len); 1229 1230 switch (opt) { 1231 case CCPOPT_BSDCOMP: 1232 if (len < 3) { 1233 ND_PRINT(" (length bogus, should be >= 3)"); 1234 return len; 1235 } 1236 ND_PRINT(": Version: %u, Dictionary Bits: %u", 1237 GET_U_1(p + 2) >> 5, 1238 GET_U_1(p + 2) & 0x1f); 1239 break; 1240 case CCPOPT_MVRCA: 1241 if (len < 4) { 1242 ND_PRINT(" (length bogus, should be >= 4)"); 1243 return len; 1244 } 1245 ND_PRINT(": Features: %u, PxP: %s, History: %u, #CTX-ID: %u", 1246 (GET_U_1(p + 2) & 0xc0) >> 6, 1247 (GET_U_1(p + 2) & 0x20) ? "Enabled" : "Disabled", 1248 GET_U_1(p + 2) & 0x1f, 1249 GET_U_1(p + 3)); 1250 break; 1251 case CCPOPT_DEFLATE: 1252 if (len < 4) { 1253 ND_PRINT(" (length bogus, should be >= 4)"); 1254 return len; 1255 } 1256 ND_PRINT(": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u", 1257 (GET_U_1(p + 2) & 0xf0) >> 4, 1258 ((GET_U_1(p + 2) & 0x0f) == 8) ? "zlib" : "unknown", 1259 GET_U_1(p + 2) & 0x0f, 1260 (GET_U_1(p + 3) & 0xfc) >> 2, 1261 GET_U_1(p + 3) & 0x03); 1262 break; 1263 1264/* XXX: to be supported */ 1265#if 0 1266 case CCPOPT_OUI: 1267 case CCPOPT_PRED1: 1268 case CCPOPT_PRED2: 1269 case CCPOPT_PJUMP: 1270 case CCPOPT_HPPPC: 1271 case CCPOPT_STACLZS: 1272 case CCPOPT_MPPC: 1273 case CCPOPT_GFZA: 1274 case CCPOPT_V42BIS: 1275 case CCPOPT_LZSDCP: 1276 case CCPOPT_DEC: 1277 case CCPOPT_RESV: 1278 break; 1279#endif 1280 default: 1281 /* 1282 * Unknown option; dump it as raw bytes now if we're 1283 * not going to do so below. 1284 */ 1285 if (ndo->ndo_vflag < 2) 1286 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); 1287 break; 1288 } 1289 if (ndo->ndo_vflag > 1) 1290 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */ 1291 1292 return len; 1293 1294trunc: 1295 ND_PRINT("[|ccp]"); 1296 return 0; 1297} 1298 1299/* BACP config options */ 1300static u_int 1301print_bacp_config_options(netdissect_options *ndo, 1302 const u_char *p, u_int length) 1303{ 1304 u_int opt, len; 1305 1306 if (length < 2) 1307 return 0; 1308 ND_TCHECK_2(p); 1309 opt = GET_U_1(p); 1310 len = GET_U_1(p + 1); 1311 if (length < len) 1312 return 0; 1313 if (len < 2) { 1314 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1315 tok2str(bacconfopts_values, "Unknown", opt), 1316 opt, 1317 len); 1318 return 0; 1319 } 1320 1321 ND_PRINT("\n\t %s Option (0x%02x), length %u", 1322 tok2str(bacconfopts_values, "Unknown", opt), 1323 opt, 1324 len); 1325 1326 switch (opt) { 1327 case BACPOPT_FPEER: 1328 if (len != 6) { 1329 ND_PRINT(" (length bogus, should be = 6)"); 1330 return len; 1331 } 1332 ND_PRINT(": Magic-Num 0x%08x", GET_BE_U_4(p + 2)); 1333 break; 1334 default: 1335 /* 1336 * Unknown option; dump it as raw bytes now if we're 1337 * not going to do so below. 1338 */ 1339 if (ndo->ndo_vflag < 2) 1340 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); 1341 break; 1342 } 1343 if (ndo->ndo_vflag > 1) 1344 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */ 1345 1346 return len; 1347 1348trunc: 1349 ND_PRINT("[|bacp]"); 1350 return 0; 1351} 1352 1353/* 1354 * Un-escape RFC 1662 PPP in HDLC-like framing, with octet escapes. 1355 * The length argument is the on-the-wire length, not the captured 1356 * length; we can only un-escape the captured part. 1357 */ 1358static void 1359ppp_hdlc(netdissect_options *ndo, 1360 const u_char *p, u_int length) 1361{ 1362 u_int caplen = ND_BYTES_AVAILABLE_AFTER(p); 1363 u_char *b, *t, c; 1364 const u_char *s; 1365 u_int i, proto; 1366 const void *sb, *se; 1367 1368 if (caplen == 0) 1369 return; 1370 1371 if (length == 0) 1372 return; 1373 1374 b = (u_char *)nd_malloc(ndo, caplen); 1375 if (b == NULL) 1376 return; 1377 1378 /* 1379 * Unescape all the data into a temporary, private, buffer. 1380 * Do this so that we don't overwrite the original packet 1381 * contents. 1382 */ 1383 for (s = p, t = b, i = caplen; i != 0; i--) { 1384 c = GET_U_1(s); 1385 s++; 1386 if (c == 0x7d) { 1387 if (i <= 1) 1388 break; 1389 i--; 1390 c = GET_U_1(s) ^ 0x20; 1391 s++; 1392 } 1393 *t++ = c; 1394 } 1395 1396 /* 1397 * Change the end pointer, so bounds checks work. 1398 * Change the pointer to packet data to help debugging. 1399 */ 1400 sb = ndo->ndo_packetp; 1401 se = ndo->ndo_snapend; 1402 ndo->ndo_packetp = b; 1403 ndo->ndo_snapend = t; 1404 length = ND_BYTES_AVAILABLE_AFTER(b); 1405 1406 /* now lets guess about the payload codepoint format */ 1407 if (length < 1) 1408 goto trunc; 1409 proto = GET_U_1(b); /* start with a one-octet codepoint guess */ 1410 1411 switch (proto) { 1412 case PPP_IP: 1413 ip_print(ndo, b + 1, length - 1); 1414 goto cleanup; 1415 case PPP_IPV6: 1416 ip6_print(ndo, b + 1, length - 1); 1417 goto cleanup; 1418 default: /* no luck - try next guess */ 1419 break; 1420 } 1421 1422 if (length < 2) 1423 goto trunc; 1424 proto = GET_BE_U_2(b); /* next guess - load two octets */ 1425 1426 switch (proto) { 1427 case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */ 1428 if (length < 4) 1429 goto trunc; 1430 proto = GET_BE_U_2(b + 2); /* load the PPP proto-id */ 1431 if ((proto & 0xff00) == 0x7e00) 1432 ND_PRINT("(protocol 0x%04x invalid)", proto); 1433 else 1434 handle_ppp(ndo, proto, b + 4, length - 4); 1435 break; 1436 default: /* last guess - proto must be a PPP proto-id */ 1437 if ((proto & 0xff00) == 0x7e00) 1438 ND_PRINT("(protocol 0x%04x invalid)", proto); 1439 else 1440 handle_ppp(ndo, proto, b + 2, length - 2); 1441 break; 1442 } 1443 1444cleanup: 1445 ndo->ndo_packetp = sb; 1446 ndo->ndo_snapend = se; 1447 return; 1448 1449trunc: 1450 ndo->ndo_packetp = sb; 1451 ndo->ndo_snapend = se; 1452 nd_print_trunc(ndo); 1453} 1454 1455 1456/* PPP */ 1457static void 1458handle_ppp(netdissect_options *ndo, 1459 u_int proto, const u_char *p, u_int length) 1460{ 1461 if ((proto & 0xff00) == 0x7e00) { /* is this an escape code ? */ 1462 ppp_hdlc(ndo, p - 1, length); 1463 return; 1464 } 1465 1466 switch (proto) { 1467 case PPP_LCP: /* fall through */ 1468 case PPP_IPCP: 1469 case PPP_OSICP: 1470 case PPP_MPLSCP: 1471 case PPP_IPV6CP: 1472 case PPP_CCP: 1473 case PPP_BACP: 1474 handle_ctrl_proto(ndo, proto, p, length); 1475 break; 1476 case PPP_ML: 1477 handle_mlppp(ndo, p, length); 1478 break; 1479 case PPP_CHAP: 1480 handle_chap(ndo, p, length); 1481 break; 1482 case PPP_PAP: 1483 handle_pap(ndo, p, length); 1484 break; 1485 case PPP_BAP: /* XXX: not yet completed */ 1486 handle_bap(ndo, p, length); 1487 break; 1488 case ETHERTYPE_IP: /*XXX*/ 1489 case PPP_VJNC: 1490 case PPP_IP: 1491 ip_print(ndo, p, length); 1492 break; 1493 case ETHERTYPE_IPV6: /*XXX*/ 1494 case PPP_IPV6: 1495 ip6_print(ndo, p, length); 1496 break; 1497 case ETHERTYPE_IPX: /*XXX*/ 1498 case PPP_IPX: 1499 ipx_print(ndo, p, length); 1500 break; 1501 case PPP_OSI: 1502 isoclns_print(ndo, p, length); 1503 break; 1504 case PPP_MPLS_UCAST: 1505 case PPP_MPLS_MCAST: 1506 mpls_print(ndo, p, length); 1507 break; 1508 case PPP_COMP: 1509 ND_PRINT("compressed PPP data"); 1510 break; 1511 default: 1512 ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); 1513 print_unknown_data(ndo, p, "\n\t", length); 1514 break; 1515 } 1516} 1517 1518/* Standard PPP printer */ 1519u_int 1520ppp_print(netdissect_options *ndo, 1521 const u_char *p, u_int length) 1522{ 1523 u_int proto,ppp_header; 1524 u_int olen = length; /* _o_riginal length */ 1525 u_int hdr_len = 0; 1526 1527 ndo->ndo_protocol = "ppp"; 1528 /* 1529 * Here, we assume that p points to the Address and Control 1530 * field (if they present). 1531 */ 1532 if (length < 2) 1533 goto trunc; 1534 ppp_header = GET_BE_U_2(p); 1535 1536 switch(ppp_header) { 1537 case (PPP_PPPD_IN << 8 | PPP_CONTROL): 1538 if (ndo->ndo_eflag) ND_PRINT("In "); 1539 p += 2; 1540 length -= 2; 1541 hdr_len += 2; 1542 break; 1543 case (PPP_PPPD_OUT << 8 | PPP_CONTROL): 1544 if (ndo->ndo_eflag) ND_PRINT("Out "); 1545 p += 2; 1546 length -= 2; 1547 hdr_len += 2; 1548 break; 1549 case (PPP_ADDRESS << 8 | PPP_CONTROL): 1550 p += 2; /* ACFC not used */ 1551 length -= 2; 1552 hdr_len += 2; 1553 break; 1554 1555 default: 1556 break; 1557 } 1558 1559 if (length < 2) 1560 goto trunc; 1561 if (GET_U_1(p) % 2) { 1562 proto = GET_U_1(p); /* PFC is used */ 1563 p++; 1564 length--; 1565 hdr_len++; 1566 } else { 1567 proto = GET_BE_U_2(p); 1568 p += 2; 1569 length -= 2; 1570 hdr_len += 2; 1571 } 1572 1573 if (ndo->ndo_eflag) { 1574 const char *typestr; 1575 typestr = tok2str(ppptype2str, "unknown", proto); 1576 ND_PRINT("%s (0x%04x), length %u", 1577 typestr, 1578 proto, 1579 olen); 1580 if (*typestr == 'u') /* "unknown" */ 1581 return hdr_len; 1582 1583 ND_PRINT(": "); 1584 } 1585 1586 handle_ppp(ndo, proto, p, length); 1587 return (hdr_len); 1588trunc: 1589 nd_print_trunc(ndo); 1590 return (0); 1591} 1592 1593 1594/* PPP I/F printer */ 1595void 1596ppp_if_print(netdissect_options *ndo, 1597 const struct pcap_pkthdr *h, const u_char *p) 1598{ 1599 u_int length = h->len; 1600 u_int caplen = h->caplen; 1601 1602 ndo->ndo_protocol = "ppp"; 1603 if (caplen < PPP_HDRLEN) { 1604 nd_print_trunc(ndo); 1605 ndo->ndo_ll_hdr_len += caplen; 1606 return; 1607 } 1608 ndo->ndo_ll_hdr_len += PPP_HDRLEN; 1609 1610#if 0 1611 /* 1612 * XXX: seems to assume that there are 2 octets prepended to an 1613 * actual PPP frame. The 1st octet looks like Input/Output flag 1614 * while 2nd octet is unknown, at least to me 1615 * (mshindo@mshindo.net). 1616 * 1617 * That was what the original tcpdump code did. 1618 * 1619 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound 1620 * packets and 0 for inbound packets - but only if the 1621 * protocol field has the 0x8000 bit set (i.e., it's a network 1622 * control protocol); it does so before running the packet through 1623 * "bpf_filter" to see if it should be discarded, and to see 1624 * if we should update the time we sent the most recent packet... 1625 * 1626 * ...but it puts the original address field back after doing 1627 * so. 1628 * 1629 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion. 1630 * 1631 * I don't know if any PPP implementation handed up to a BPF 1632 * device packets with the first octet being 1 for outbound and 1633 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know 1634 * whether that ever needs to be checked or not. 1635 * 1636 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP, 1637 * and its tcpdump appears to assume that the frame always 1638 * begins with an address field and a control field, and that 1639 * the address field might be 0x0f or 0x8f, for Cisco 1640 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1641 * 1547, as well as 0xff, for PPP in HDLC-like framing as per 1642 * RFC 1662. 1643 * 1644 * (Is the Cisco framing in question what DLT_C_HDLC, in 1645 * BSD/OS, is?) 1646 */ 1647 if (ndo->ndo_eflag) 1648 ND_PRINT("%c %4d %02x ", GET_U_1(p) ? 'O' : 'I', 1649 length, GET_U_1(p + 1)); 1650#endif 1651 1652 ppp_print(ndo, p, length); 1653} 1654 1655/* 1656 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like 1657 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547, 1658 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL, 1659 * discard them *if* those are the first two octets, and parse the remaining 1660 * packet as a PPP packet, as "ppp_print()" does). 1661 * 1662 * This handles, for example, DLT_PPP_SERIAL in NetBSD. 1663 */ 1664void 1665ppp_hdlc_if_print(netdissect_options *ndo, 1666 const struct pcap_pkthdr *h, const u_char *p) 1667{ 1668 u_int length = h->len; 1669 u_int caplen = h->caplen; 1670 u_int proto; 1671 u_int hdrlen = 0; 1672 1673 ndo->ndo_protocol = "ppp_hdlc"; 1674 if (caplen < 2) { 1675 nd_print_trunc(ndo); 1676 ndo->ndo_ll_hdr_len += caplen; 1677 return; 1678 } 1679 1680 switch (GET_U_1(p)) { 1681 1682 case PPP_ADDRESS: 1683 if (caplen < 4) { 1684 nd_print_trunc(ndo); 1685 ndo->ndo_ll_hdr_len += caplen; 1686 return; 1687 } 1688 1689 if (ndo->ndo_eflag) 1690 ND_PRINT("%02x %02x %u ", GET_U_1(p), 1691 GET_U_1(p + 1), length); 1692 p += 2; 1693 length -= 2; 1694 hdrlen += 2; 1695 1696 proto = GET_BE_U_2(p); 1697 p += 2; 1698 length -= 2; 1699 hdrlen += 2; 1700 ND_PRINT("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); 1701 1702 handle_ppp(ndo, proto, p, length); 1703 break; 1704 1705 case CHDLC_UNICAST: 1706 case CHDLC_BCAST: 1707 chdlc_if_print(ndo, h, p); 1708 return; 1709 1710 default: 1711 if (caplen < 4) { 1712 nd_print_trunc(ndo); 1713 ndo->ndo_ll_hdr_len += caplen; 1714 return; 1715 } 1716 1717 if (ndo->ndo_eflag) 1718 ND_PRINT("%02x %02x %u ", GET_U_1(p), 1719 GET_U_1(p + 1), length); 1720 p += 2; 1721 hdrlen += 2; 1722 1723 /* 1724 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats 1725 * the next two octets as an Ethernet type; does that 1726 * ever happen? 1727 */ 1728 ND_PRINT("unknown addr %02x; ctrl %02x", GET_U_1(p), 1729 GET_U_1(p + 1)); 1730 break; 1731 } 1732 1733 ndo->ndo_ll_hdr_len += hdrlen; 1734} 1735 1736#define PPP_BSDI_HDRLEN 24 1737 1738/* BSD/OS specific PPP printer */ 1739void 1740ppp_bsdos_if_print(netdissect_options *ndo, 1741 const struct pcap_pkthdr *h _U_, const u_char *p _U_) 1742{ 1743 u_int hdrlength; 1744#ifdef __bsdi__ 1745 u_int length = h->len; 1746 u_int caplen = h->caplen; 1747 uint16_t ptype; 1748 uint8_t llhl; 1749 const u_char *q; 1750 u_int i; 1751 1752 ndo->ndo_protocol = "ppp_bsdos"; 1753 if (caplen < PPP_BSDI_HDRLEN) { 1754 nd_print_trunc(ndo); 1755 ndo->ndo_ll_hdr_len += caplen; 1756 return; 1757 } 1758 1759 hdrlength = 0; 1760 1761#if 0 1762 if (GET_U_1(p) == PPP_ADDRESS && 1763 GET_U_1(p + 1) == PPP_CONTROL) { 1764 if (ndo->ndo_eflag) 1765 ND_PRINT("%02x %02x ", GET_U_1(p), 1766 GET_U_1(p + 1)); 1767 p += 2; 1768 hdrlength = 2; 1769 } 1770 1771 if (ndo->ndo_eflag) 1772 ND_PRINT("%u ", length); 1773 /* Retrieve the protocol type */ 1774 if (GET_U_1(p) & 01) { 1775 /* Compressed protocol field */ 1776 ptype = GET_U_1(p); 1777 if (ndo->ndo_eflag) 1778 ND_PRINT("%02x ", ptype); 1779 p++; 1780 hdrlength += 1; 1781 } else { 1782 /* Un-compressed protocol field */ 1783 ptype = GET_BE_U_2(p); 1784 if (ndo->ndo_eflag) 1785 ND_PRINT("%04x ", ptype); 1786 p += 2; 1787 hdrlength += 2; 1788 } 1789#else 1790 ptype = 0; /*XXX*/ 1791 if (ndo->ndo_eflag) 1792 ND_PRINT("%c ", GET_U_1(p + SLC_DIR) ? 'O' : 'I'); 1793 llhl = GET_U_1(p + SLC_LLHL); 1794 if (llhl) { 1795 /* link level header */ 1796 struct ppp_header *ph; 1797 1798 q = p + SLC_BPFHDRLEN; 1799 ph = (struct ppp_header *)q; 1800 if (ph->phdr_addr == PPP_ADDRESS 1801 && ph->phdr_ctl == PPP_CONTROL) { 1802 if (ndo->ndo_eflag) 1803 ND_PRINT("%02x %02x ", GET_U_1(q), 1804 GET_U_1(q + 1)); 1805 ptype = GET_BE_U_2(&ph->phdr_type); 1806 if (ndo->ndo_eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) { 1807 ND_PRINT("%s ", tok2str(ppptype2str, 1808 "proto-#%u", ptype)); 1809 } 1810 } else { 1811 if (ndo->ndo_eflag) { 1812 ND_PRINT("LLH=["); 1813 for (i = 0; i < llhl; i++) 1814 ND_PRINT("%02x", GET_U_1(q + i)); 1815 ND_PRINT("] "); 1816 } 1817 } 1818 } 1819 if (ndo->ndo_eflag) 1820 ND_PRINT("%u ", length); 1821 if (GET_U_1(p + SLC_CHL)) { 1822 q = p + SLC_BPFHDRLEN + llhl; 1823 1824 switch (ptype) { 1825 case PPP_VJC: 1826 ptype = vjc_print(ndo, q, ptype); 1827 hdrlength = PPP_BSDI_HDRLEN; 1828 p += hdrlength; 1829 switch (ptype) { 1830 case PPP_IP: 1831 ip_print(ndo, p, length); 1832 break; 1833 case PPP_IPV6: 1834 ip6_print(ndo, p, length); 1835 break; 1836 case PPP_MPLS_UCAST: 1837 case PPP_MPLS_MCAST: 1838 mpls_print(ndo, p, length); 1839 break; 1840 } 1841 goto printx; 1842 case PPP_VJNC: 1843 ptype = vjc_print(ndo, q, ptype); 1844 hdrlength = PPP_BSDI_HDRLEN; 1845 p += hdrlength; 1846 switch (ptype) { 1847 case PPP_IP: 1848 ip_print(ndo, p, length); 1849 break; 1850 case PPP_IPV6: 1851 ip6_print(ndo, p, length); 1852 break; 1853 case PPP_MPLS_UCAST: 1854 case PPP_MPLS_MCAST: 1855 mpls_print(ndo, p, length); 1856 break; 1857 } 1858 goto printx; 1859 default: 1860 if (ndo->ndo_eflag) { 1861 ND_PRINT("CH=["); 1862 for (i = 0; i < llhl; i++) 1863 ND_PRINT("%02x", 1864 GET_U_1(q + i)); 1865 ND_PRINT("] "); 1866 } 1867 break; 1868 } 1869 } 1870 1871 hdrlength = PPP_BSDI_HDRLEN; 1872#endif 1873 1874 length -= hdrlength; 1875 p += hdrlength; 1876 1877 switch (ptype) { 1878 case PPP_IP: 1879 ip_print(p, length); 1880 break; 1881 case PPP_IPV6: 1882 ip6_print(ndo, p, length); 1883 break; 1884 case PPP_MPLS_UCAST: 1885 case PPP_MPLS_MCAST: 1886 mpls_print(ndo, p, length); 1887 break; 1888 default: 1889 ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype)); 1890 } 1891 1892printx: 1893#else /* __bsdi */ 1894 hdrlength = 0; 1895#endif /* __bsdi__ */ 1896 ndo->ndo_ll_hdr_len += hdrlength; 1897} 1898