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 (at) 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 <stdlib.h> 46 47 #include "netdissect.h" 48 #include "extract.h" 49 #include "addrtoname.h" 50 #include "ppp.h" 51 #include "chdlc.h" 52 #include "ethertype.h" 53 #include "oui.h" 54 55 /* 56 * The following constatns are defined by IANA. Please refer to 57 * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers 58 * for the up-to-date information. 59 */ 60 61 /* Protocol Codes defined in ppp.h */ 62 63 static const struct tok ppptype2str[] = { 64 { PPP_IP, "IP" }, 65 { PPP_OSI, "OSI" }, 66 { PPP_NS, "NS" }, 67 { PPP_DECNET, "DECNET" }, 68 { PPP_APPLE, "APPLE" }, 69 { PPP_IPX, "IPX" }, 70 { PPP_VJC, "VJC IP" }, 71 { PPP_VJNC, "VJNC IP" }, 72 { PPP_BRPDU, "BRPDU" }, 73 { PPP_STII, "STII" }, 74 { PPP_VINES, "VINES" }, 75 { PPP_MPLS_UCAST, "MPLS" }, 76 { PPP_MPLS_MCAST, "MPLS" }, 77 { PPP_COMP, "Compressed"}, 78 { PPP_ML, "MLPPP"}, 79 { PPP_IPV6, "IP6"}, 80 81 { PPP_HELLO, "HELLO" }, 82 { PPP_LUXCOM, "LUXCOM" }, 83 { PPP_SNS, "SNS" }, 84 { PPP_IPCP, "IPCP" }, 85 { PPP_OSICP, "OSICP" }, 86 { PPP_NSCP, "NSCP" }, 87 { PPP_DECNETCP, "DECNETCP" }, 88 { PPP_APPLECP, "APPLECP" }, 89 { PPP_IPXCP, "IPXCP" }, 90 { PPP_STIICP, "STIICP" }, 91 { PPP_VINESCP, "VINESCP" }, 92 { PPP_IPV6CP, "IP6CP" }, 93 { PPP_MPLSCP, "MPLSCP" }, 94 95 { PPP_LCP, "LCP" }, 96 { PPP_PAP, "PAP" }, 97 { PPP_LQM, "LQM" }, 98 { PPP_CHAP, "CHAP" }, 99 { PPP_EAP, "EAP" }, 100 { PPP_SPAP, "SPAP" }, 101 { PPP_SPAP_OLD, "Old-SPAP" }, 102 { PPP_BACP, "BACP" }, 103 { PPP_BAP, "BAP" }, 104 { PPP_MPCP, "MLPPP-CP" }, 105 { PPP_CCP, "CCP" }, 106 { 0, NULL } 107 }; 108 109 /* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */ 110 111 #define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */ 112 #define CPCODES_CONF_REQ 1 /* Configure-Request */ 113 #define CPCODES_CONF_ACK 2 /* Configure-Ack */ 114 #define CPCODES_CONF_NAK 3 /* Configure-Nak */ 115 #define CPCODES_CONF_REJ 4 /* Configure-Reject */ 116 #define CPCODES_TERM_REQ 5 /* Terminate-Request */ 117 #define CPCODES_TERM_ACK 6 /* Terminate-Ack */ 118 #define CPCODES_CODE_REJ 7 /* Code-Reject */ 119 #define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */ 120 #define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */ 121 #define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */ 122 #define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */ 123 #define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */ 124 #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */ 125 #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */ 126 #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */ 127 128 static const struct tok cpcodes[] = { 129 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */ 130 {CPCODES_CONF_REQ, "Conf-Request"}, 131 {CPCODES_CONF_ACK, "Conf-Ack"}, 132 {CPCODES_CONF_NAK, "Conf-Nack"}, 133 {CPCODES_CONF_REJ, "Conf-Reject"}, 134 {CPCODES_TERM_REQ, "Term-Request"}, 135 {CPCODES_TERM_ACK, "Term-Ack"}, 136 {CPCODES_CODE_REJ, "Code-Reject"}, 137 {CPCODES_PROT_REJ, "Prot-Reject"}, 138 {CPCODES_ECHO_REQ, "Echo-Request"}, 139 {CPCODES_ECHO_RPL, "Echo-Reply"}, 140 {CPCODES_DISC_REQ, "Disc-Req"}, 141 {CPCODES_ID, "Ident"}, /* RFC1570 */ 142 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */ 143 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */ 144 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */ 145 {0, NULL} 146 }; 147 148 /* LCP Config Options */ 149 150 #define LCPOPT_VEXT 0 151 #define LCPOPT_MRU 1 152 #define LCPOPT_ACCM 2 153 #define LCPOPT_AP 3 154 #define LCPOPT_QP 4 155 #define LCPOPT_MN 5 156 #define LCPOPT_DEP6 6 157 #define LCPOPT_PFC 7 158 #define LCPOPT_ACFC 8 159 #define LCPOPT_FCSALT 9 160 #define LCPOPT_SDP 10 161 #define LCPOPT_NUMMODE 11 162 #define LCPOPT_DEP12 12 163 #define LCPOPT_CBACK 13 164 #define LCPOPT_DEP14 14 165 #define LCPOPT_DEP15 15 166 #define LCPOPT_DEP16 16 167 #define LCPOPT_MLMRRU 17 168 #define LCPOPT_MLSSNHF 18 169 #define LCPOPT_MLED 19 170 #define LCPOPT_PROP 20 171 #define LCPOPT_DCEID 21 172 #define LCPOPT_MPP 22 173 #define LCPOPT_LD 23 174 #define LCPOPT_LCPAOPT 24 175 #define LCPOPT_COBS 25 176 #define LCPOPT_PE 26 177 #define LCPOPT_MLHF 27 178 #define LCPOPT_I18N 28 179 #define LCPOPT_SDLOS 29 180 #define LCPOPT_PPPMUX 30 181 182 #define LCPOPT_MIN LCPOPT_VEXT 183 #define LCPOPT_MAX LCPOPT_PPPMUX 184 185 static const char *lcpconfopts[] = { 186 "Vend-Ext", /* (0) */ 187 "MRU", /* (1) */ 188 "ACCM", /* (2) */ 189 "Auth-Prot", /* (3) */ 190 "Qual-Prot", /* (4) */ 191 "Magic-Num", /* (5) */ 192 "deprecated(6)", /* used to be a Quality Protocol */ 193 "PFC", /* (7) */ 194 "ACFC", /* (8) */ 195 "FCS-Alt", /* (9) */ 196 "SDP", /* (10) */ 197 "Num-Mode", /* (11) */ 198 "deprecated(12)", /* used to be a Multi-Link-Procedure*/ 199 "Call-Back", /* (13) */ 200 "deprecated(14)", /* used to be a Connect-Time */ 201 "deprecated(15)", /* used to be a Compund-Frames */ 202 "deprecated(16)", /* used to be a Nominal-Data-Encap */ 203 "MRRU", /* (17) */ 204 "12-Bit seq #", /* (18) */ 205 "End-Disc", /* (19) */ 206 "Proprietary", /* (20) */ 207 "DCE-Id", /* (21) */ 208 "MP+", /* (22) */ 209 "Link-Disc", /* (23) */ 210 "LCP-Auth-Opt", /* (24) */ 211 "COBS", /* (25) */ 212 "Prefix-elision", /* (26) */ 213 "Multilink-header-Form",/* (27) */ 214 "I18N", /* (28) */ 215 "SDL-over-SONET/SDH", /* (29) */ 216 "PPP-Muxing", /* (30) */ 217 }; 218 219 /* ECP - to be supported */ 220 221 /* CCP Config Options */ 222 223 #define CCPOPT_OUI 0 /* RFC1962 */ 224 #define CCPOPT_PRED1 1 /* RFC1962 */ 225 #define CCPOPT_PRED2 2 /* RFC1962 */ 226 #define CCPOPT_PJUMP 3 /* RFC1962 */ 227 /* 4-15 unassigned */ 228 #define CCPOPT_HPPPC 16 /* RFC1962 */ 229 #define CCPOPT_STACLZS 17 /* RFC1974 */ 230 #define CCPOPT_MPPC 18 /* RFC2118 */ 231 #define CCPOPT_GFZA 19 /* RFC1962 */ 232 #define CCPOPT_V42BIS 20 /* RFC1962 */ 233 #define CCPOPT_BSDCOMP 21 /* RFC1977 */ 234 /* 22 unassigned */ 235 #define CCPOPT_LZSDCP 23 /* RFC1967 */ 236 #define CCPOPT_MVRCA 24 /* RFC1975 */ 237 #define CCPOPT_DEC 25 /* RFC1976 */ 238 #define CCPOPT_DEFLATE 26 /* RFC1979 */ 239 /* 27-254 unassigned */ 240 #define CCPOPT_RESV 255 /* RFC1962 */ 241 242 static const struct tok ccpconfopts_values[] = { 243 { CCPOPT_OUI, "OUI" }, 244 { CCPOPT_PRED1, "Pred-1" }, 245 { CCPOPT_PRED2, "Pred-2" }, 246 { CCPOPT_PJUMP, "Puddle" }, 247 { CCPOPT_HPPPC, "HP-PPC" }, 248 { CCPOPT_STACLZS, "Stac-LZS" }, 249 { CCPOPT_MPPC, "MPPC" }, 250 { CCPOPT_GFZA, "Gand-FZA" }, 251 { CCPOPT_V42BIS, "V.42bis" }, 252 { CCPOPT_BSDCOMP, "BSD-Comp" }, 253 { CCPOPT_LZSDCP, "LZS-DCP" }, 254 { CCPOPT_MVRCA, "MVRCA" }, 255 { CCPOPT_DEC, "DEC" }, 256 { CCPOPT_DEFLATE, "Deflate" }, 257 { CCPOPT_RESV, "Reserved"}, 258 {0, NULL} 259 }; 260 261 /* BACP Config Options */ 262 263 #define BACPOPT_FPEER 1 /* RFC2125 */ 264 265 static const struct tok bacconfopts_values[] = { 266 { BACPOPT_FPEER, "Favored-Peer" }, 267 {0, NULL} 268 }; 269 270 271 /* SDCP - to be supported */ 272 273 /* IPCP Config Options */ 274 #define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */ 275 #define IPCPOPT_IPCOMP 2 /* RFC1332 */ 276 #define IPCPOPT_ADDR 3 /* RFC1332 */ 277 #define IPCPOPT_MOBILE4 4 /* RFC2290 */ 278 #define IPCPOPT_PRIDNS 129 /* RFC1877 */ 279 #define IPCPOPT_PRINBNS 130 /* RFC1877 */ 280 #define IPCPOPT_SECDNS 131 /* RFC1877 */ 281 #define IPCPOPT_SECNBNS 132 /* RFC1877 */ 282 283 static const struct tok ipcpopt_values[] = { 284 { IPCPOPT_2ADDR, "IP-Addrs" }, 285 { IPCPOPT_IPCOMP, "IP-Comp" }, 286 { IPCPOPT_ADDR, "IP-Addr" }, 287 { IPCPOPT_MOBILE4, "Home-Addr" }, 288 { IPCPOPT_PRIDNS, "Pri-DNS" }, 289 { IPCPOPT_PRINBNS, "Pri-NBNS" }, 290 { IPCPOPT_SECDNS, "Sec-DNS" }, 291 { IPCPOPT_SECNBNS, "Sec-NBNS" }, 292 { 0, NULL } 293 }; 294 295 #define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */ 296 #define IPCPOPT_IPCOMP_MINLEN 14 297 298 static const struct tok ipcpopt_compproto_values[] = { 299 { PPP_VJC, "VJ-Comp" }, 300 { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" }, 301 { 0, NULL } 302 }; 303 304 static const struct tok ipcpopt_compproto_subopt_values[] = { 305 { 1, "RTP-Compression" }, 306 { 2, "Enhanced RTP-Compression" }, 307 { 0, NULL } 308 }; 309 310 /* IP6CP Config Options */ 311 #define IP6CP_IFID 1 312 313 static const struct tok ip6cpopt_values[] = { 314 { IP6CP_IFID, "Interface-ID" }, 315 { 0, NULL } 316 }; 317 318 /* ATCP - to be supported */ 319 /* OSINLCP - to be supported */ 320 /* BVCP - to be supported */ 321 /* BCP - to be supported */ 322 /* IPXCP - to be supported */ 323 /* MPLSCP - to be supported */ 324 325 /* Auth Algorithms */ 326 327 /* 0-4 Reserved (RFC1994) */ 328 #define AUTHALG_CHAPMD5 5 /* RFC1994 */ 329 #define AUTHALG_MSCHAP1 128 /* RFC2433 */ 330 #define AUTHALG_MSCHAP2 129 /* RFC2795 */ 331 332 static const struct tok authalg_values[] = { 333 { AUTHALG_CHAPMD5, "MD5" }, 334 { AUTHALG_MSCHAP1, "MS-CHAPv1" }, 335 { AUTHALG_MSCHAP2, "MS-CHAPv2" }, 336 { 0, NULL } 337 }; 338 339 /* FCS Alternatives - to be supported */ 340 341 /* Multilink Endpoint Discriminator (RFC1717) */ 342 #define MEDCLASS_NULL 0 /* Null Class */ 343 #define MEDCLASS_LOCAL 1 /* Locally Assigned */ 344 #define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */ 345 #define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */ 346 #define MEDCLASS_MNB 4 /* PPP Magic Number Block */ 347 #define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */ 348 349 /* PPP LCP Callback */ 350 #define CALLBACK_AUTH 0 /* Location determined by user auth */ 351 #define CALLBACK_DSTR 1 /* Dialing string */ 352 #define CALLBACK_LID 2 /* Location identifier */ 353 #define CALLBACK_E164 3 /* E.164 number */ 354 #define CALLBACK_X500 4 /* X.500 distinguished name */ 355 #define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */ 356 357 static const struct tok ppp_callback_values[] = { 358 { CALLBACK_AUTH, "UserAuth" }, 359 { CALLBACK_DSTR, "DialString" }, 360 { CALLBACK_LID, "LocalID" }, 361 { CALLBACK_E164, "E.164" }, 362 { CALLBACK_X500, "X.500" }, 363 { CALLBACK_CBCP, "CBCP" }, 364 { 0, NULL } 365 }; 366 367 /* CHAP */ 368 369 #define CHAP_CHAL 1 370 #define CHAP_RESP 2 371 #define CHAP_SUCC 3 372 #define CHAP_FAIL 4 373 374 static const struct tok chapcode_values[] = { 375 { CHAP_CHAL, "Challenge" }, 376 { CHAP_RESP, "Response" }, 377 { CHAP_SUCC, "Success" }, 378 { CHAP_FAIL, "Fail" }, 379 { 0, NULL} 380 }; 381 382 /* PAP */ 383 384 #define PAP_AREQ 1 385 #define PAP_AACK 2 386 #define PAP_ANAK 3 387 388 static const struct tok papcode_values[] = { 389 { PAP_AREQ, "Auth-Req" }, 390 { PAP_AACK, "Auth-ACK" }, 391 { PAP_ANAK, "Auth-NACK" }, 392 { 0, NULL } 393 }; 394 395 /* BAP */ 396 #define BAP_CALLREQ 1 397 #define BAP_CALLRES 2 398 #define BAP_CBREQ 3 399 #define BAP_CBRES 4 400 #define BAP_LDQREQ 5 401 #define BAP_LDQRES 6 402 #define BAP_CSIND 7 403 #define BAP_CSRES 8 404 405 static int print_lcp_config_options(netdissect_options *, const u_char *p, int); 406 static int print_ipcp_config_options(netdissect_options *, const u_char *p, int); 407 static int print_ip6cp_config_options(netdissect_options *, const u_char *p, int); 408 static int print_ccp_config_options(netdissect_options *, const u_char *p, int); 409 static int print_bacp_config_options(netdissect_options *, const u_char *p, int); 410 static void handle_ppp(netdissect_options *, u_int proto, const u_char *p, int length); 411 412 /* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */ 413 static void 414 handle_ctrl_proto(netdissect_options *ndo, 415 u_int proto, const u_char *pptr, int length) 416 { 417 const char *typestr; 418 u_int code, len; 419 int (*pfunc)(netdissect_options *, const u_char *, int); 420 int x, j; 421 const u_char *tptr; 422 423 tptr=pptr; 424 425 typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto); 426 ND_PRINT((ndo, "%s, ", typestr)); 427 428 if (length < 4) /* FIXME weak boundary checking */ 429 goto trunc; 430 ND_TCHECK2(*tptr, 2); 431 432 code = *tptr++; 433 434 ND_PRINT((ndo, "%s (0x%02x), id %u, length %u", 435 tok2str(cpcodes, "Unknown Opcode",code), 436 code, 437 *tptr++, /* ID */ 438 length + 2)); 439 440 if (!ndo->ndo_vflag) 441 return; 442 443 if (length <= 4) 444 return; /* there may be a NULL confreq etc. */ 445 446 ND_TCHECK2(*tptr, 2); 447 len = EXTRACT_16BITS(tptr); 448 tptr += 2; 449 450 ND_PRINT((ndo, "\n\tencoded length %u (=Option(s) length %u)", len, len - 4)); 451 452 if (ndo->ndo_vflag > 1) 453 print_unknown_data(ndo, pptr - 2, "\n\t", 6); 454 455 456 switch (code) { 457 case CPCODES_VEXT: 458 if (length < 11) 459 break; 460 ND_TCHECK2(*tptr, 4); 461 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); 462 tptr += 4; 463 ND_TCHECK2(*tptr, 3); 464 ND_PRINT((ndo, " Vendor: %s (%u)", 465 tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)), 466 EXTRACT_24BITS(tptr))); 467 /* XXX: need to decode Kind and Value(s)? */ 468 break; 469 case CPCODES_CONF_REQ: 470 case CPCODES_CONF_ACK: 471 case CPCODES_CONF_NAK: 472 case CPCODES_CONF_REJ: 473 x = len - 4; /* Code(1), Identifier(1) and Length(2) */ 474 do { 475 switch (proto) { 476 case PPP_LCP: 477 pfunc = print_lcp_config_options; 478 break; 479 case PPP_IPCP: 480 pfunc = print_ipcp_config_options; 481 break; 482 case PPP_IPV6CP: 483 pfunc = print_ip6cp_config_options; 484 break; 485 case PPP_CCP: 486 pfunc = print_ccp_config_options; 487 break; 488 case PPP_BACP: 489 pfunc = print_bacp_config_options; 490 break; 491 default: 492 /* 493 * No print routine for the options for 494 * this protocol. 495 */ 496 pfunc = NULL; 497 break; 498 } 499 500 if (pfunc == NULL) /* catch the above null pointer if unknown CP */ 501 break; 502 503 if ((j = (*pfunc)(ndo, tptr, len)) == 0) 504 break; 505 x -= j; 506 tptr += j; 507 } while (x > 0); 508 break; 509 510 case CPCODES_TERM_REQ: 511 case CPCODES_TERM_ACK: 512 /* XXX: need to decode Data? */ 513 break; 514 case CPCODES_CODE_REJ: 515 /* XXX: need to decode Rejected-Packet? */ 516 break; 517 case CPCODES_PROT_REJ: 518 if (length < 6) 519 break; 520 ND_TCHECK2(*tptr, 2); 521 ND_PRINT((ndo, "\n\t Rejected %s Protocol (0x%04x)", 522 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)), 523 EXTRACT_16BITS(tptr))); 524 /* XXX: need to decode Rejected-Information? - hexdump for now */ 525 if (len > 6) { 526 ND_PRINT((ndo, "\n\t Rejected Packet")); 527 print_unknown_data(ndo, tptr + 2, "\n\t ", len - 2); 528 } 529 break; 530 case CPCODES_ECHO_REQ: 531 case CPCODES_ECHO_RPL: 532 case CPCODES_DISC_REQ: 533 if (length < 8) 534 break; 535 ND_TCHECK2(*tptr, 4); 536 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); 537 /* XXX: need to decode Data? - hexdump for now */ 538 if (len > 8) { 539 ND_PRINT((ndo, "\n\t -----trailing data-----")); 540 ND_TCHECK2(tptr[4], len - 8); 541 print_unknown_data(ndo, tptr + 4, "\n\t ", len - 8); 542 } 543 break; 544 case CPCODES_ID: 545 if (length < 8) 546 break; 547 ND_TCHECK2(*tptr, 4); 548 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); 549 /* RFC 1661 says this is intended to be human readable */ 550 if (len > 8) { 551 ND_PRINT((ndo, "\n\t Message\n\t ")); 552 if (fn_printn(ndo, tptr + 4, len - 4, ndo->ndo_snapend)) 553 goto trunc; 554 } 555 break; 556 case CPCODES_TIME_REM: 557 if (length < 12) 558 break; 559 ND_TCHECK2(*tptr, 4); 560 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr))); 561 ND_TCHECK2(*(tptr + 4), 4); 562 ND_PRINT((ndo, ", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4))); 563 /* XXX: need to decode Message? */ 564 break; 565 default: 566 /* XXX this is dirty but we do not get the 567 * original pointer passed to the begin 568 * the PPP packet */ 569 if (ndo->ndo_vflag <= 1) 570 print_unknown_data(ndo, pptr - 2, "\n\t ", length + 2); 571 break; 572 } 573 return; 574 575 trunc: 576 ND_PRINT((ndo, "[|%s]", typestr)); 577 } 578 579 /* LCP config options */ 580 static int 581 print_lcp_config_options(netdissect_options *ndo, 582 const u_char *p, int length) 583 { 584 int len, opt; 585 586 if (length < 2) 587 return 0; 588 ND_TCHECK2(*p, 2); 589 len = p[1]; 590 opt = p[0]; 591 if (length < len) 592 return 0; 593 if (len < 2) { 594 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) 595 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 596 lcpconfopts[opt], opt, len)); 597 else 598 ND_PRINT((ndo, "\n\tunknown LCP option 0x%02x", opt)); 599 return 0; 600 } 601 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) 602 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len)); 603 else { 604 ND_PRINT((ndo, "\n\tunknown LCP option 0x%02x", opt)); 605 return len; 606 } 607 608 switch (opt) { 609 case LCPOPT_VEXT: 610 if (len < 6) { 611 ND_PRINT((ndo, " (length bogus, should be >= 6)")); 612 return len; 613 } 614 ND_TCHECK_24BITS(p + 2); 615 ND_PRINT((ndo, ": Vendor: %s (%u)", 616 tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)), 617 EXTRACT_24BITS(p + 2))); 618 #if 0 619 ND_TCHECK(p[5]); 620 ND_PRINT((ndo, ", kind: 0x%02x", p[5])); 621 ND_PRINT((ndo, ", Value: 0x")); 622 for (i = 0; i < len - 6; i++) { 623 ND_TCHECK(p[6 + i]); 624 ND_PRINT((ndo, "%02x", p[6 + i])); 625 } 626 #endif 627 break; 628 case LCPOPT_MRU: 629 if (len != 4) { 630 ND_PRINT((ndo, " (length bogus, should be = 4)")); 631 return len; 632 } 633 ND_TCHECK_16BITS(p + 2); 634 ND_PRINT((ndo, ": %u", EXTRACT_16BITS(p + 2))); 635 break; 636 case LCPOPT_ACCM: 637 if (len != 6) { 638 ND_PRINT((ndo, " (length bogus, should be = 6)")); 639 return len; 640 } 641 ND_TCHECK_32BITS(p + 2); 642 ND_PRINT((ndo, ": 0x%08x", EXTRACT_32BITS(p + 2))); 643 break; 644 case LCPOPT_AP: 645 if (len < 4) { 646 ND_PRINT((ndo, " (length bogus, should be >= 4)")); 647 return len; 648 } 649 ND_TCHECK_16BITS(p + 2); 650 ND_PRINT((ndo, ": %s", tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", EXTRACT_16BITS(p + 2)))); 651 652 switch (EXTRACT_16BITS(p+2)) { 653 case PPP_CHAP: 654 ND_TCHECK(p[4]); 655 ND_PRINT((ndo, ", %s", tok2str(authalg_values, "Unknown Auth Alg %u", p[4]))); 656 break; 657 case PPP_PAP: /* fall through */ 658 case PPP_EAP: 659 case PPP_SPAP: 660 case PPP_SPAP_OLD: 661 break; 662 default: 663 print_unknown_data(ndo, p, "\n\t", len); 664 } 665 break; 666 case LCPOPT_QP: 667 if (len < 4) { 668 ND_PRINT((ndo, " (length bogus, should be >= 4)")); 669 return 0; 670 } 671 ND_TCHECK_16BITS(p+2); 672 if (EXTRACT_16BITS(p+2) == PPP_LQM) 673 ND_PRINT((ndo, ": LQR")); 674 else 675 ND_PRINT((ndo, ": unknown")); 676 break; 677 case LCPOPT_MN: 678 if (len != 6) { 679 ND_PRINT((ndo, " (length bogus, should be = 6)")); 680 return 0; 681 } 682 ND_TCHECK_32BITS(p + 2); 683 ND_PRINT((ndo, ": 0x%08x", EXTRACT_32BITS(p + 2))); 684 break; 685 case LCPOPT_PFC: 686 break; 687 case LCPOPT_ACFC: 688 break; 689 case LCPOPT_LD: 690 if (len != 4) { 691 ND_PRINT((ndo, " (length bogus, should be = 4)")); 692 return 0; 693 } 694 ND_TCHECK_16BITS(p + 2); 695 ND_PRINT((ndo, ": 0x%04x", EXTRACT_16BITS(p + 2))); 696 break; 697 case LCPOPT_CBACK: 698 if (len < 3) { 699 ND_PRINT((ndo, " (length bogus, should be >= 3)")); 700 return 0; 701 } 702 ND_PRINT((ndo, ": ")); 703 ND_TCHECK(p[2]); 704 ND_PRINT((ndo, ": Callback Operation %s (%u)", 705 tok2str(ppp_callback_values, "Unknown", p[2]), 706 p[2])); 707 break; 708 case LCPOPT_MLMRRU: 709 if (len != 4) { 710 ND_PRINT((ndo, " (length bogus, should be = 4)")); 711 return 0; 712 } 713 ND_TCHECK_16BITS(p + 2); 714 ND_PRINT((ndo, ": %u", EXTRACT_16BITS(p + 2))); 715 break; 716 case LCPOPT_MLED: 717 if (len < 3) { 718 ND_PRINT((ndo, " (length bogus, should be >= 3)")); 719 return 0; 720 } 721 ND_TCHECK(p[2]); 722 switch (p[2]) { /* class */ 723 case MEDCLASS_NULL: 724 ND_PRINT((ndo, ": Null")); 725 break; 726 case MEDCLASS_LOCAL: 727 ND_PRINT((ndo, ": Local")); /* XXX */ 728 break; 729 case MEDCLASS_IPV4: 730 if (len != 7) { 731 ND_PRINT((ndo, " (length bogus, should be = 7)")); 732 return 0; 733 } 734 ND_TCHECK2(*(p + 3), 4); 735 ND_PRINT((ndo, ": IPv4 %s", ipaddr_string(ndo, p + 3))); 736 break; 737 case MEDCLASS_MAC: 738 if (len != 9) { 739 ND_PRINT((ndo, " (length bogus, should be = 9)")); 740 return 0; 741 } 742 ND_TCHECK2(*(p + 3), 6); 743 ND_PRINT((ndo, ": MAC %s", etheraddr_string(ndo, p + 3))); 744 break; 745 case MEDCLASS_MNB: 746 ND_PRINT((ndo, ": Magic-Num-Block")); /* XXX */ 747 break; 748 case MEDCLASS_PSNDN: 749 ND_PRINT((ndo, ": PSNDN")); /* XXX */ 750 break; 751 default: 752 ND_PRINT((ndo, ": Unknown class %u", p[2])); 753 break; 754 } 755 break; 756 757 /* XXX: to be supported */ 758 #if 0 759 case LCPOPT_DEP6: 760 case LCPOPT_FCSALT: 761 case LCPOPT_SDP: 762 case LCPOPT_NUMMODE: 763 case LCPOPT_DEP12: 764 case LCPOPT_DEP14: 765 case LCPOPT_DEP15: 766 case LCPOPT_DEP16: 767 case LCPOPT_MLSSNHF: 768 case LCPOPT_PROP: 769 case LCPOPT_DCEID: 770 case LCPOPT_MPP: 771 case LCPOPT_LCPAOPT: 772 case LCPOPT_COBS: 773 case LCPOPT_PE: 774 case LCPOPT_MLHF: 775 case LCPOPT_I18N: 776 case LCPOPT_SDLOS: 777 case LCPOPT_PPPMUX: 778 break; 779 #endif 780 default: 781 /* 782 * Unknown option; dump it as raw bytes now if we're 783 * not going to do so below. 784 */ 785 if (ndo->ndo_vflag < 2) 786 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); 787 break; 788 } 789 790 if (ndo->ndo_vflag > 1) 791 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */ 792 793 return len; 794 795 trunc: 796 ND_PRINT((ndo, "[|lcp]")); 797 return 0; 798 } 799 800 /* ML-PPP*/ 801 static const struct tok ppp_ml_flag_values[] = { 802 { 0x80, "begin" }, 803 { 0x40, "end" }, 804 { 0, NULL } 805 }; 806 807 static void 808 handle_mlppp(netdissect_options *ndo, 809 const u_char *p, int length) 810 { 811 if (!ndo->ndo_eflag) 812 ND_PRINT((ndo, "MLPPP, ")); 813 814 if (length < 2) { 815 ND_PRINT((ndo, "[|mlppp]")); 816 return; 817 } 818 if (!ND_TTEST_16BITS(p)) { 819 ND_PRINT((ndo, "[|mlppp]")); 820 return; 821 } 822 823 ND_PRINT((ndo, "seq 0x%03x, Flags [%s], length %u", 824 (EXTRACT_16BITS(p))&0x0fff, /* only support 12-Bit sequence space for now */ 825 bittok2str(ppp_ml_flag_values, "none", *p & 0xc0), 826 length)); 827 } 828 829 /* CHAP */ 830 static void 831 handle_chap(netdissect_options *ndo, 832 const u_char *p, int length) 833 { 834 u_int code, len; 835 int val_size, name_size, msg_size; 836 const u_char *p0; 837 int i; 838 839 p0 = p; 840 if (length < 1) { 841 ND_PRINT((ndo, "[|chap]")); 842 return; 843 } else if (length < 4) { 844 ND_TCHECK(*p); 845 ND_PRINT((ndo, "[|chap 0x%02x]", *p)); 846 return; 847 } 848 849 ND_TCHECK(*p); 850 code = *p; 851 ND_PRINT((ndo, "CHAP, %s (0x%02x)", 852 tok2str(chapcode_values,"unknown",code), 853 code)); 854 p++; 855 856 ND_TCHECK(*p); 857 ND_PRINT((ndo, ", id %u", *p)); /* ID */ 858 p++; 859 860 ND_TCHECK2(*p, 2); 861 len = EXTRACT_16BITS(p); 862 p += 2; 863 864 /* 865 * Note that this is a generic CHAP decoding routine. Since we 866 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1, 867 * MS-CHAPv2) is used at this point, we can't decode packet 868 * specifically to each algorithms. Instead, we simply decode 869 * the GCD (Gratest Common Denominator) for all algorithms. 870 */ 871 switch (code) { 872 case CHAP_CHAL: 873 case CHAP_RESP: 874 if (length - (p - p0) < 1) 875 return; 876 ND_TCHECK(*p); 877 val_size = *p; /* value size */ 878 p++; 879 if (length - (p - p0) < val_size) 880 return; 881 ND_PRINT((ndo, ", Value ")); 882 for (i = 0; i < val_size; i++) { 883 ND_TCHECK(*p); 884 ND_PRINT((ndo, "%02x", *p++)); 885 } 886 name_size = len - (p - p0); 887 ND_PRINT((ndo, ", Name ")); 888 for (i = 0; i < name_size; i++) { 889 ND_TCHECK(*p); 890 safeputchar(ndo, *p++); 891 } 892 break; 893 case CHAP_SUCC: 894 case CHAP_FAIL: 895 msg_size = len - (p - p0); 896 ND_PRINT((ndo, ", Msg ")); 897 for (i = 0; i< msg_size; i++) { 898 ND_TCHECK(*p); 899 safeputchar(ndo, *p++); 900 } 901 break; 902 } 903 return; 904 905 trunc: 906 ND_PRINT((ndo, "[|chap]")); 907 } 908 909 /* PAP (see RFC 1334) */ 910 static void 911 handle_pap(netdissect_options *ndo, 912 const u_char *p, int length) 913 { 914 u_int code, len; 915 int peerid_len, passwd_len, msg_len; 916 const u_char *p0; 917 int i; 918 919 p0 = p; 920 if (length < 1) { 921 ND_PRINT((ndo, "[|pap]")); 922 return; 923 } else if (length < 4) { 924 ND_TCHECK(*p); 925 ND_PRINT((ndo, "[|pap 0x%02x]", *p)); 926 return; 927 } 928 929 ND_TCHECK(*p); 930 code = *p; 931 ND_PRINT((ndo, "PAP, %s (0x%02x)", 932 tok2str(papcode_values, "unknown", code), 933 code)); 934 p++; 935 936 ND_TCHECK(*p); 937 ND_PRINT((ndo, ", id %u", *p)); /* ID */ 938 p++; 939 940 ND_TCHECK2(*p, 2); 941 len = EXTRACT_16BITS(p); 942 p += 2; 943 944 if ((int)len > length) { 945 ND_PRINT((ndo, ", length %u > packet size", len)); 946 return; 947 } 948 length = len; 949 if (length < (p - p0)) { 950 ND_PRINT((ndo, ", length %u < PAP header length", length)); 951 return; 952 } 953 954 switch (code) { 955 case PAP_AREQ: 956 /* A valid Authenticate-Request is 6 or more octets long. */ 957 if (len < 6) 958 goto trunc; 959 if (length - (p - p0) < 1) 960 return; 961 ND_TCHECK(*p); 962 peerid_len = *p; /* Peer-ID Length */ 963 p++; 964 if (length - (p - p0) < peerid_len) 965 return; 966 ND_PRINT((ndo, ", Peer ")); 967 for (i = 0; i < peerid_len; i++) { 968 ND_TCHECK(*p); 969 safeputchar(ndo, *p++); 970 } 971 972 if (length - (p - p0) < 1) 973 return; 974 ND_TCHECK(*p); 975 passwd_len = *p; /* Password Length */ 976 p++; 977 if (length - (p - p0) < passwd_len) 978 return; 979 ND_PRINT((ndo, ", Name ")); 980 for (i = 0; i < passwd_len; i++) { 981 ND_TCHECK(*p); 982 safeputchar(ndo, *p++); 983 } 984 break; 985 case PAP_AACK: 986 case PAP_ANAK: 987 /* Although some implementations ignore truncation at 988 * this point and at least one generates a truncated 989 * packet, RFC 1334 section 2.2.2 clearly states that 990 * both AACK and ANAK are at least 5 bytes long. 991 */ 992 if (len < 5) 993 goto trunc; 994 if (length - (p - p0) < 1) 995 return; 996 ND_TCHECK(*p); 997 msg_len = *p; /* Msg-Length */ 998 p++; 999 if (length - (p - p0) < msg_len) 1000 return; 1001 ND_PRINT((ndo, ", Msg ")); 1002 for (i = 0; i< msg_len; i++) { 1003 ND_TCHECK(*p); 1004 safeputchar(ndo, *p++); 1005 } 1006 break; 1007 } 1008 return; 1009 1010 trunc: 1011 ND_PRINT((ndo, "[|pap]")); 1012 } 1013 1014 /* BAP */ 1015 static void 1016 handle_bap(netdissect_options *ndo _U_, 1017 const u_char *p _U_, int length _U_) 1018 { 1019 /* XXX: to be supported!! */ 1020 } 1021 1022 1023 /* IPCP config options */ 1024 static int 1025 print_ipcp_config_options(netdissect_options *ndo, 1026 const u_char *p, int length) 1027 { 1028 int len, opt; 1029 u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen; 1030 1031 if (length < 2) 1032 return 0; 1033 ND_TCHECK2(*p, 2); 1034 len = p[1]; 1035 opt = p[0]; 1036 if (length < len) 1037 return 0; 1038 if (len < 2) { 1039 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1040 tok2str(ipcpopt_values,"unknown",opt), 1041 opt, 1042 len)); 1043 return 0; 1044 } 1045 1046 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", 1047 tok2str(ipcpopt_values,"unknown",opt), 1048 opt, 1049 len)); 1050 1051 switch (opt) { 1052 case IPCPOPT_2ADDR: /* deprecated */ 1053 if (len != 10) { 1054 ND_PRINT((ndo, " (length bogus, should be = 10)")); 1055 return len; 1056 } 1057 ND_TCHECK2(*(p + 6), 4); 1058 ND_PRINT((ndo, ": src %s, dst %s", 1059 ipaddr_string(ndo, p + 2), 1060 ipaddr_string(ndo, p + 6))); 1061 break; 1062 case IPCPOPT_IPCOMP: 1063 if (len < 4) { 1064 ND_PRINT((ndo, " (length bogus, should be >= 4)")); 1065 return 0; 1066 } 1067 ND_TCHECK_16BITS(p+2); 1068 compproto = EXTRACT_16BITS(p+2); 1069 1070 ND_PRINT((ndo, ": %s (0x%02x):", 1071 tok2str(ipcpopt_compproto_values, "Unknown", compproto), 1072 compproto)); 1073 1074 switch (compproto) { 1075 case PPP_VJC: 1076 /* XXX: VJ-Comp parameters should be decoded */ 1077 break; 1078 case IPCPOPT_IPCOMP_HDRCOMP: 1079 if (len < IPCPOPT_IPCOMP_MINLEN) { 1080 ND_PRINT((ndo, " (length bogus, should be >= %u)", 1081 IPCPOPT_IPCOMP_MINLEN)); 1082 return 0; 1083 } 1084 1085 ND_TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN); 1086 ND_PRINT((ndo, "\n\t TCP Space %u, non-TCP Space %u" \ 1087 ", maxPeriod %u, maxTime %u, maxHdr %u", 1088 EXTRACT_16BITS(p+4), 1089 EXTRACT_16BITS(p+6), 1090 EXTRACT_16BITS(p+8), 1091 EXTRACT_16BITS(p+10), 1092 EXTRACT_16BITS(p+12))); 1093 1094 /* suboptions present ? */ 1095 if (len > IPCPOPT_IPCOMP_MINLEN) { 1096 ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN; 1097 p += IPCPOPT_IPCOMP_MINLEN; 1098 1099 ND_PRINT((ndo, "\n\t Suboptions, length %u", ipcomp_subopttotallen)); 1100 1101 while (ipcomp_subopttotallen >= 2) { 1102 ND_TCHECK2(*p, 2); 1103 ipcomp_subopt = *p; 1104 ipcomp_suboptlen = *(p+1); 1105 1106 /* sanity check */ 1107 if (ipcomp_subopt == 0 || 1108 ipcomp_suboptlen == 0 ) 1109 break; 1110 1111 /* XXX: just display the suboptions for now */ 1112 ND_PRINT((ndo, "\n\t\t%s Suboption #%u, length %u", 1113 tok2str(ipcpopt_compproto_subopt_values, 1114 "Unknown", 1115 ipcomp_subopt), 1116 ipcomp_subopt, 1117 ipcomp_suboptlen)); 1118 1119 ipcomp_subopttotallen -= ipcomp_suboptlen; 1120 p += ipcomp_suboptlen; 1121 } 1122 } 1123 break; 1124 default: 1125 break; 1126 } 1127 break; 1128 1129 case IPCPOPT_ADDR: /* those options share the same format - fall through */ 1130 case IPCPOPT_MOBILE4: 1131 case IPCPOPT_PRIDNS: 1132 case IPCPOPT_PRINBNS: 1133 case IPCPOPT_SECDNS: 1134 case IPCPOPT_SECNBNS: 1135 if (len != 6) { 1136 ND_PRINT((ndo, " (length bogus, should be = 6)")); 1137 return 0; 1138 } 1139 ND_TCHECK2(*(p + 2), 4); 1140 ND_PRINT((ndo, ": %s", ipaddr_string(ndo, p + 2))); 1141 break; 1142 default: 1143 /* 1144 * Unknown option; dump it as raw bytes now if we're 1145 * not going to do so below. 1146 */ 1147 if (ndo->ndo_vflag < 2) 1148 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); 1149 break; 1150 } 1151 if (ndo->ndo_vflag > 1) 1152 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */ 1153 return len; 1154 1155 trunc: 1156 ND_PRINT((ndo, "[|ipcp]")); 1157 return 0; 1158 } 1159 1160 /* IP6CP config options */ 1161 static int 1162 print_ip6cp_config_options(netdissect_options *ndo, 1163 const u_char *p, int length) 1164 { 1165 int len, opt; 1166 1167 if (length < 2) 1168 return 0; 1169 ND_TCHECK2(*p, 2); 1170 len = p[1]; 1171 opt = p[0]; 1172 if (length < len) 1173 return 0; 1174 if (len < 2) { 1175 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1176 tok2str(ip6cpopt_values,"unknown",opt), 1177 opt, 1178 len)); 1179 return 0; 1180 } 1181 1182 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", 1183 tok2str(ip6cpopt_values,"unknown",opt), 1184 opt, 1185 len)); 1186 1187 switch (opt) { 1188 case IP6CP_IFID: 1189 if (len != 10) { 1190 ND_PRINT((ndo, " (length bogus, should be = 10)")); 1191 return len; 1192 } 1193 ND_TCHECK2(*(p + 2), 8); 1194 ND_PRINT((ndo, ": %04x:%04x:%04x:%04x", 1195 EXTRACT_16BITS(p + 2), 1196 EXTRACT_16BITS(p + 4), 1197 EXTRACT_16BITS(p + 6), 1198 EXTRACT_16BITS(p + 8))); 1199 break; 1200 default: 1201 /* 1202 * Unknown option; dump it as raw bytes now if we're 1203 * not going to do so below. 1204 */ 1205 if (ndo->ndo_vflag < 2) 1206 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); 1207 break; 1208 } 1209 if (ndo->ndo_vflag > 1) 1210 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */ 1211 1212 return len; 1213 1214 trunc: 1215 ND_PRINT((ndo, "[|ip6cp]")); 1216 return 0; 1217 } 1218 1219 1220 /* CCP config options */ 1221 static int 1222 print_ccp_config_options(netdissect_options *ndo, 1223 const u_char *p, int length) 1224 { 1225 int len, opt; 1226 1227 if (length < 2) 1228 return 0; 1229 ND_TCHECK2(*p, 2); 1230 len = p[1]; 1231 opt = p[0]; 1232 if (length < len) 1233 return 0; 1234 if (len < 2) { 1235 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1236 tok2str(ccpconfopts_values, "Unknown", opt), 1237 opt, 1238 len)); 1239 return 0; 1240 } 1241 1242 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", 1243 tok2str(ccpconfopts_values, "Unknown", opt), 1244 opt, 1245 len)); 1246 1247 switch (opt) { 1248 case CCPOPT_BSDCOMP: 1249 if (len < 3) { 1250 ND_PRINT((ndo, " (length bogus, should be >= 3)")); 1251 return len; 1252 } 1253 ND_TCHECK(p[2]); 1254 ND_PRINT((ndo, ": Version: %u, Dictionary Bits: %u", 1255 p[2] >> 5, p[2] & 0x1f)); 1256 break; 1257 case CCPOPT_MVRCA: 1258 if (len < 4) { 1259 ND_PRINT((ndo, " (length bogus, should be >= 4)")); 1260 return len; 1261 } 1262 ND_TCHECK(p[3]); 1263 ND_PRINT((ndo, ": Features: %u, PxP: %s, History: %u, #CTX-ID: %u", 1264 (p[2] & 0xc0) >> 6, 1265 (p[2] & 0x20) ? "Enabled" : "Disabled", 1266 p[2] & 0x1f, p[3])); 1267 break; 1268 case CCPOPT_DEFLATE: 1269 if (len < 4) { 1270 ND_PRINT((ndo, " (length bogus, should be >= 4)")); 1271 return len; 1272 } 1273 ND_TCHECK(p[3]); 1274 ND_PRINT((ndo, ": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u", 1275 (p[2] & 0xf0) >> 4, 1276 ((p[2] & 0x0f) == 8) ? "zlib" : "unknown", 1277 p[2] & 0x0f, (p[3] & 0xfc) >> 2, p[3] & 0x03)); 1278 break; 1279 1280 /* XXX: to be supported */ 1281 #if 0 1282 case CCPOPT_OUI: 1283 case CCPOPT_PRED1: 1284 case CCPOPT_PRED2: 1285 case CCPOPT_PJUMP: 1286 case CCPOPT_HPPPC: 1287 case CCPOPT_STACLZS: 1288 case CCPOPT_MPPC: 1289 case CCPOPT_GFZA: 1290 case CCPOPT_V42BIS: 1291 case CCPOPT_LZSDCP: 1292 case CCPOPT_DEC: 1293 case CCPOPT_RESV: 1294 break; 1295 #endif 1296 default: 1297 /* 1298 * Unknown option; dump it as raw bytes now if we're 1299 * not going to do so below. 1300 */ 1301 if (ndo->ndo_vflag < 2) 1302 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); 1303 break; 1304 } 1305 if (ndo->ndo_vflag > 1) 1306 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */ 1307 1308 return len; 1309 1310 trunc: 1311 ND_PRINT((ndo, "[|ccp]")); 1312 return 0; 1313 } 1314 1315 /* BACP config options */ 1316 static int 1317 print_bacp_config_options(netdissect_options *ndo, 1318 const u_char *p, int length) 1319 { 1320 int len, opt; 1321 1322 if (length < 2) 1323 return 0; 1324 ND_TCHECK2(*p, 2); 1325 len = p[1]; 1326 opt = p[0]; 1327 if (length < len) 1328 return 0; 1329 if (len < 2) { 1330 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1331 tok2str(bacconfopts_values, "Unknown", opt), 1332 opt, 1333 len)); 1334 return 0; 1335 } 1336 1337 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", 1338 tok2str(bacconfopts_values, "Unknown", opt), 1339 opt, 1340 len)); 1341 1342 switch (opt) { 1343 case BACPOPT_FPEER: 1344 if (len != 6) { 1345 ND_PRINT((ndo, " (length bogus, should be = 6)")); 1346 return len; 1347 } 1348 ND_TCHECK_32BITS(p + 2); 1349 ND_PRINT((ndo, ": Magic-Num 0x%08x", EXTRACT_32BITS(p + 2))); 1350 break; 1351 default: 1352 /* 1353 * Unknown option; dump it as raw bytes now if we're 1354 * not going to do so below. 1355 */ 1356 if (ndo->ndo_vflag < 2) 1357 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); 1358 break; 1359 } 1360 if (ndo->ndo_vflag > 1) 1361 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */ 1362 1363 return len; 1364 1365 trunc: 1366 ND_PRINT((ndo, "[|bacp]")); 1367 return 0; 1368 } 1369 1370 static void 1371 ppp_hdlc(netdissect_options *ndo, 1372 const u_char *p, int length) 1373 { 1374 u_char *b, *t, c; 1375 const u_char *s; 1376 int i, proto; 1377 const void *se; 1378 1379 if (length <= 0) 1380 return; 1381 1382 b = (u_char *)malloc(length); 1383 if (b == NULL) 1384 return; 1385 1386 /* 1387 * Unescape all the data into a temporary, private, buffer. 1388 * Do this so that we dont overwrite the original packet 1389 * contents. 1390 */ 1391 for (s = p, t = b, i = length; i > 0 && ND_TTEST(*s); i--) { 1392 c = *s++; 1393 if (c == 0x7d) { 1394 if (i <= 1 || !ND_TTEST(*s)) 1395 break; 1396 i--; 1397 c = *s++ ^ 0x20; 1398 } 1399 *t++ = c; 1400 } 1401 1402 se = ndo->ndo_snapend; 1403 ndo->ndo_snapend = t; 1404 length = t - b; 1405 1406 /* now lets guess about the payload codepoint format */ 1407 if (length < 1) 1408 goto trunc; 1409 proto = *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 = EXTRACT_16BITS(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 = EXTRACT_16BITS(b+2); /* load the PPP proto-id */ 1431 handle_ppp(ndo, proto, b + 4, length - 4); 1432 break; 1433 default: /* last guess - proto must be a PPP proto-id */ 1434 handle_ppp(ndo, proto, b + 2, length - 2); 1435 break; 1436 } 1437 1438 cleanup: 1439 ndo->ndo_snapend = se; 1440 free(b); 1441 return; 1442 1443 trunc: 1444 ndo->ndo_snapend = se; 1445 free(b); 1446 ND_PRINT((ndo, "[|ppp]")); 1447 } 1448 1449 1450 /* PPP */ 1451 static void 1452 handle_ppp(netdissect_options *ndo, 1453 u_int proto, const u_char *p, int length) 1454 { 1455 if ((proto & 0xff00) == 0x7e00) { /* is this an escape code ? */ 1456 ppp_hdlc(ndo, p - 1, length); 1457 return; 1458 } 1459 1460 switch (proto) { 1461 case PPP_LCP: /* fall through */ 1462 case PPP_IPCP: 1463 case PPP_OSICP: 1464 case PPP_MPLSCP: 1465 case PPP_IPV6CP: 1466 case PPP_CCP: 1467 case PPP_BACP: 1468 handle_ctrl_proto(ndo, proto, p, length); 1469 break; 1470 case PPP_ML: 1471 handle_mlppp(ndo, p, length); 1472 break; 1473 case PPP_CHAP: 1474 handle_chap(ndo, p, length); 1475 break; 1476 case PPP_PAP: 1477 handle_pap(ndo, p, length); 1478 break; 1479 case PPP_BAP: /* XXX: not yet completed */ 1480 handle_bap(ndo, p, length); 1481 break; 1482 case ETHERTYPE_IP: /*XXX*/ 1483 case PPP_VJNC: 1484 case PPP_IP: 1485 ip_print(ndo, p, length); 1486 break; 1487 case ETHERTYPE_IPV6: /*XXX*/ 1488 case PPP_IPV6: 1489 ip6_print(ndo, p, length); 1490 break; 1491 case ETHERTYPE_IPX: /*XXX*/ 1492 case PPP_IPX: 1493 ipx_print(ndo, p, length); 1494 break; 1495 case PPP_OSI: 1496 isoclns_print(ndo, p, length); 1497 break; 1498 case PPP_MPLS_UCAST: 1499 case PPP_MPLS_MCAST: 1500 mpls_print(ndo, p, length); 1501 break; 1502 case PPP_COMP: 1503 ND_PRINT((ndo, "compressed PPP data")); 1504 break; 1505 default: 1506 ND_PRINT((ndo, "%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto))); 1507 print_unknown_data(ndo, p, "\n\t", length); 1508 break; 1509 } 1510 } 1511 1512 /* Standard PPP printer */ 1513 u_int 1514 ppp_print(netdissect_options *ndo, 1515 register const u_char *p, u_int length) 1516 { 1517 u_int proto,ppp_header; 1518 u_int olen = length; /* _o_riginal length */ 1519 u_int hdr_len = 0; 1520 1521 /* 1522 * Here, we assume that p points to the Address and Control 1523 * field (if they present). 1524 */ 1525 if (length < 2) 1526 goto trunc; 1527 ND_TCHECK2(*p, 2); 1528 ppp_header = EXTRACT_16BITS(p); 1529 1530 switch(ppp_header) { 1531 case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL): 1532 if (ndo->ndo_eflag) ND_PRINT((ndo, "In ")); 1533 p += 2; 1534 length -= 2; 1535 hdr_len += 2; 1536 break; 1537 case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL): 1538 if (ndo->ndo_eflag) ND_PRINT((ndo, "Out ")); 1539 p += 2; 1540 length -= 2; 1541 hdr_len += 2; 1542 break; 1543 case (PPP_ADDRESS << 8 | PPP_CONTROL): 1544 p += 2; /* ACFC not used */ 1545 length -= 2; 1546 hdr_len += 2; 1547 break; 1548 1549 default: 1550 break; 1551 } 1552 1553 if (length < 2) 1554 goto trunc; 1555 ND_TCHECK(*p); 1556 if (*p % 2) { 1557 proto = *p; /* PFC is used */ 1558 p++; 1559 length--; 1560 hdr_len++; 1561 } else { 1562 ND_TCHECK2(*p, 2); 1563 proto = EXTRACT_16BITS(p); 1564 p += 2; 1565 length -= 2; 1566 hdr_len += 2; 1567 } 1568 1569 if (ndo->ndo_eflag) 1570 ND_PRINT((ndo, "%s (0x%04x), length %u: ", 1571 tok2str(ppptype2str, "unknown", proto), 1572 proto, 1573 olen)); 1574 1575 handle_ppp(ndo, proto, p, length); 1576 return (hdr_len); 1577 trunc: 1578 ND_PRINT((ndo, "[|ppp]")); 1579 return (0); 1580 } 1581 1582 1583 /* PPP I/F printer */ 1584 u_int 1585 ppp_if_print(netdissect_options *ndo, 1586 const struct pcap_pkthdr *h, register const u_char *p) 1587 { 1588 register u_int length = h->len; 1589 register u_int caplen = h->caplen; 1590 1591 if (caplen < PPP_HDRLEN) { 1592 ND_PRINT((ndo, "[|ppp]")); 1593 return (caplen); 1594 } 1595 1596 #if 0 1597 /* 1598 * XXX: seems to assume that there are 2 octets prepended to an 1599 * actual PPP frame. The 1st octet looks like Input/Output flag 1600 * while 2nd octet is unknown, at least to me 1601 * (mshindo (at) mshindo.net). 1602 * 1603 * That was what the original tcpdump code did. 1604 * 1605 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound 1606 * packets and 0 for inbound packets - but only if the 1607 * protocol field has the 0x8000 bit set (i.e., it's a network 1608 * control protocol); it does so before running the packet through 1609 * "bpf_filter" to see if it should be discarded, and to see 1610 * if we should update the time we sent the most recent packet... 1611 * 1612 * ...but it puts the original address field back after doing 1613 * so. 1614 * 1615 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion. 1616 * 1617 * I don't know if any PPP implementation handed up to a BPF 1618 * device packets with the first octet being 1 for outbound and 1619 * 0 for inbound packets, so I (guy (at) alum.mit.edu) don't know 1620 * whether that ever needs to be checked or not. 1621 * 1622 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP, 1623 * and its tcpdump appears to assume that the frame always 1624 * begins with an address field and a control field, and that 1625 * the address field might be 0x0f or 0x8f, for Cisco 1626 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1627 * 1547, as well as 0xff, for PPP in HDLC-like framing as per 1628 * RFC 1662. 1629 * 1630 * (Is the Cisco framing in question what DLT_C_HDLC, in 1631 * BSD/OS, is?) 1632 */ 1633 if (ndo->ndo_eflag) 1634 ND_PRINT((ndo, "%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1])); 1635 #endif 1636 1637 ppp_print(ndo, p, length); 1638 1639 return (0); 1640 } 1641 1642 /* 1643 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like 1644 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547, 1645 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL, 1646 * discard them *if* those are the first two octets, and parse the remaining 1647 * packet as a PPP packet, as "ppp_print()" does). 1648 * 1649 * This handles, for example, DLT_PPP_SERIAL in NetBSD. 1650 */ 1651 u_int 1652 ppp_hdlc_if_print(netdissect_options *ndo, 1653 const struct pcap_pkthdr *h, register const u_char *p) 1654 { 1655 register u_int length = h->len; 1656 register u_int caplen = h->caplen; 1657 u_int proto; 1658 u_int hdrlen = 0; 1659 1660 if (caplen < 2) { 1661 ND_PRINT((ndo, "[|ppp]")); 1662 return (caplen); 1663 } 1664 1665 switch (p[0]) { 1666 1667 case PPP_ADDRESS: 1668 if (caplen < 4) { 1669 ND_PRINT((ndo, "[|ppp]")); 1670 return (caplen); 1671 } 1672 1673 if (ndo->ndo_eflag) 1674 ND_PRINT((ndo, "%02x %02x %d ", p[0], p[1], length)); 1675 p += 2; 1676 length -= 2; 1677 hdrlen += 2; 1678 1679 proto = EXTRACT_16BITS(p); 1680 p += 2; 1681 length -= 2; 1682 hdrlen += 2; 1683 ND_PRINT((ndo, "%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto))); 1684 1685 handle_ppp(ndo, proto, p, length); 1686 break; 1687 1688 case CHDLC_UNICAST: 1689 case CHDLC_BCAST: 1690 return (chdlc_if_print(ndo, h, p)); 1691 1692 default: 1693 if (caplen < 4) { 1694 ND_PRINT((ndo, "[|ppp]")); 1695 return (caplen); 1696 } 1697 1698 if (ndo->ndo_eflag) 1699 ND_PRINT((ndo, "%02x %02x %d ", p[0], p[1], length)); 1700 p += 2; 1701 hdrlen += 2; 1702 1703 /* 1704 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats 1705 * the next two octets as an Ethernet type; does that 1706 * ever happen? 1707 */ 1708 ND_PRINT((ndo, "unknown addr %02x; ctrl %02x", p[0], p[1])); 1709 break; 1710 } 1711 1712 return (hdrlen); 1713 } 1714 1715 #define PPP_BSDI_HDRLEN 24 1716 1717 /* BSD/OS specific PPP printer */ 1718 u_int 1719 ppp_bsdos_if_print(netdissect_options *ndo _U_, 1720 const struct pcap_pkthdr *h _U_, register const u_char *p _U_) 1721 { 1722 register int hdrlength; 1723 #ifdef __bsdi__ 1724 register u_int length = h->len; 1725 register u_int caplen = h->caplen; 1726 uint16_t ptype; 1727 const u_char *q; 1728 int i; 1729 1730 if (caplen < PPP_BSDI_HDRLEN) { 1731 ND_PRINT((ndo, "[|ppp]")); 1732 return (caplen) 1733 } 1734 1735 hdrlength = 0; 1736 1737 #if 0 1738 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) { 1739 if (ndo->ndo_eflag) 1740 ND_PRINT((ndo, "%02x %02x ", p[0], p[1])); 1741 p += 2; 1742 hdrlength = 2; 1743 } 1744 1745 if (ndo->ndo_eflag) 1746 ND_PRINT((ndo, "%d ", length)); 1747 /* Retrieve the protocol type */ 1748 if (*p & 01) { 1749 /* Compressed protocol field */ 1750 ptype = *p; 1751 if (ndo->ndo_eflag) 1752 ND_PRINT((ndo, "%02x ", ptype)); 1753 p++; 1754 hdrlength += 1; 1755 } else { 1756 /* Un-compressed protocol field */ 1757 ptype = EXTRACT_16BITS(p); 1758 if (ndo->ndo_eflag) 1759 ND_PRINT((ndo, "%04x ", ptype)); 1760 p += 2; 1761 hdrlength += 2; 1762 } 1763 #else 1764 ptype = 0; /*XXX*/ 1765 if (ndo->ndo_eflag) 1766 ND_PRINT((ndo, "%c ", p[SLC_DIR] ? 'O' : 'I')); 1767 if (p[SLC_LLHL]) { 1768 /* link level header */ 1769 struct ppp_header *ph; 1770 1771 q = p + SLC_BPFHDRLEN; 1772 ph = (struct ppp_header *)q; 1773 if (ph->phdr_addr == PPP_ADDRESS 1774 && ph->phdr_ctl == PPP_CONTROL) { 1775 if (ndo->ndo_eflag) 1776 ND_PRINT((ndo, "%02x %02x ", q[0], q[1])); 1777 ptype = EXTRACT_16BITS(&ph->phdr_type); 1778 if (ndo->ndo_eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) { 1779 ND_PRINT((ndo, "%s ", tok2str(ppptype2str, 1780 "proto-#%d", ptype))); 1781 } 1782 } else { 1783 if (ndo->ndo_eflag) { 1784 ND_PRINT((ndo, "LLH=[")); 1785 for (i = 0; i < p[SLC_LLHL]; i++) 1786 ND_PRINT((ndo, "%02x", q[i])); 1787 ND_PRINT((ndo, "] ")); 1788 } 1789 } 1790 } 1791 if (ndo->ndo_eflag) 1792 ND_PRINT((ndo, "%d ", length)); 1793 if (p[SLC_CHL]) { 1794 q = p + SLC_BPFHDRLEN + p[SLC_LLHL]; 1795 1796 switch (ptype) { 1797 case PPP_VJC: 1798 ptype = vjc_print(ndo, q, ptype); 1799 hdrlength = PPP_BSDI_HDRLEN; 1800 p += hdrlength; 1801 switch (ptype) { 1802 case PPP_IP: 1803 ip_print(ndo, p, length); 1804 break; 1805 case PPP_IPV6: 1806 ip6_print(ndo, p, length); 1807 break; 1808 case PPP_MPLS_UCAST: 1809 case PPP_MPLS_MCAST: 1810 mpls_print(ndo, p, length); 1811 break; 1812 } 1813 goto printx; 1814 case PPP_VJNC: 1815 ptype = vjc_print(ndo, q, ptype); 1816 hdrlength = PPP_BSDI_HDRLEN; 1817 p += hdrlength; 1818 switch (ptype) { 1819 case PPP_IP: 1820 ip_print(ndo, p, length); 1821 break; 1822 case PPP_IPV6: 1823 ip6_print(ndo, p, length); 1824 break; 1825 case PPP_MPLS_UCAST: 1826 case PPP_MPLS_MCAST: 1827 mpls_print(ndo, p, length); 1828 break; 1829 } 1830 goto printx; 1831 default: 1832 if (ndo->ndo_eflag) { 1833 ND_PRINT((ndo, "CH=[")); 1834 for (i = 0; i < p[SLC_LLHL]; i++) 1835 ND_PRINT((ndo, "%02x", q[i])); 1836 ND_PRINT((ndo, "] ")); 1837 } 1838 break; 1839 } 1840 } 1841 1842 hdrlength = PPP_BSDI_HDRLEN; 1843 #endif 1844 1845 length -= hdrlength; 1846 p += hdrlength; 1847 1848 switch (ptype) { 1849 case PPP_IP: 1850 ip_print(p, length); 1851 break; 1852 case PPP_IPV6: 1853 ip6_print(ndo, p, length); 1854 break; 1855 case PPP_MPLS_UCAST: 1856 case PPP_MPLS_MCAST: 1857 mpls_print(ndo, p, length); 1858 break; 1859 default: 1860 ND_PRINT((ndo, "%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype))); 1861 } 1862 1863 printx: 1864 #else /* __bsdi */ 1865 hdrlength = 0; 1866 #endif /* __bsdi__ */ 1867 return (hdrlength); 1868 } 1869 1870 1871 /* 1872 * Local Variables: 1873 * c-style: whitesmith 1874 * c-basic-offset: 8 1875 * End: 1876 */ 1877
