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 <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 #include "netdissect-alloc.h" 55 56 /* 57 * The following constants are defined by IANA. Please refer to 58 * https://www.isi.edu/in-notes/iana/assignments/ppp-numbers 59 * for the up-to-date information. 60 */ 61 62 /* Protocol Codes defined in ppp.h */ 63 64 static const struct tok ppptype2str[] = { 65 { PPP_IP, "IP" }, 66 { PPP_OSI, "OSI" }, 67 { PPP_NS, "NS" }, 68 { PPP_DECNET, "DECNET" }, 69 { PPP_APPLE, "APPLE" }, 70 { PPP_IPX, "IPX" }, 71 { PPP_VJC, "VJC IP" }, 72 { PPP_VJNC, "VJNC IP" }, 73 { PPP_BRPDU, "BRPDU" }, 74 { PPP_STII, "STII" }, 75 { PPP_VINES, "VINES" }, 76 { PPP_MPLS_UCAST, "MPLS" }, 77 { PPP_MPLS_MCAST, "MPLS" }, 78 { PPP_COMP, "Compressed"}, 79 { PPP_ML, "MLPPP"}, 80 { PPP_IPV6, "IP6"}, 81 82 { PPP_HELLO, "HELLO" }, 83 { PPP_LUXCOM, "LUXCOM" }, 84 { PPP_SNS, "SNS" }, 85 { PPP_IPCP, "IPCP" }, 86 { PPP_OSICP, "OSICP" }, 87 { PPP_NSCP, "NSCP" }, 88 { PPP_DECNETCP, "DECNETCP" }, 89 { PPP_APPLECP, "APPLECP" }, 90 { PPP_IPXCP, "IPXCP" }, 91 { PPP_STIICP, "STIICP" }, 92 { PPP_VINESCP, "VINESCP" }, 93 { PPP_IPV6CP, "IP6CP" }, 94 { PPP_MPLSCP, "MPLSCP" }, 95 96 { PPP_LCP, "LCP" }, 97 { PPP_PAP, "PAP" }, 98 { PPP_LQM, "LQM" }, 99 { PPP_CHAP, "CHAP" }, 100 { PPP_EAP, "EAP" }, 101 { PPP_SPAP, "SPAP" }, 102 { PPP_SPAP_OLD, "Old-SPAP" }, 103 { PPP_BACP, "BACP" }, 104 { PPP_BAP, "BAP" }, 105 { PPP_MPCP, "MLPPP-CP" }, 106 { PPP_CCP, "CCP" }, 107 { 0, NULL } 108 }; 109 110 /* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */ 111 112 #define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */ 113 #define CPCODES_CONF_REQ 1 /* Configure-Request */ 114 #define CPCODES_CONF_ACK 2 /* Configure-Ack */ 115 #define CPCODES_CONF_NAK 3 /* Configure-Nak */ 116 #define CPCODES_CONF_REJ 4 /* Configure-Reject */ 117 #define CPCODES_TERM_REQ 5 /* Terminate-Request */ 118 #define CPCODES_TERM_ACK 6 /* Terminate-Ack */ 119 #define CPCODES_CODE_REJ 7 /* Code-Reject */ 120 #define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */ 121 #define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */ 122 #define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */ 123 #define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */ 124 #define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */ 125 #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */ 126 #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */ 127 #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */ 128 129 static const struct tok cpcodes[] = { 130 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */ 131 {CPCODES_CONF_REQ, "Conf-Request"}, 132 {CPCODES_CONF_ACK, "Conf-Ack"}, 133 {CPCODES_CONF_NAK, "Conf-Nack"}, 134 {CPCODES_CONF_REJ, "Conf-Reject"}, 135 {CPCODES_TERM_REQ, "Term-Request"}, 136 {CPCODES_TERM_ACK, "Term-Ack"}, 137 {CPCODES_CODE_REJ, "Code-Reject"}, 138 {CPCODES_PROT_REJ, "Prot-Reject"}, 139 {CPCODES_ECHO_REQ, "Echo-Request"}, 140 {CPCODES_ECHO_RPL, "Echo-Reply"}, 141 {CPCODES_DISC_REQ, "Disc-Req"}, 142 {CPCODES_ID, "Ident"}, /* RFC1570 */ 143 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */ 144 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */ 145 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */ 146 {0, NULL} 147 }; 148 149 /* LCP Config Options */ 150 151 #define LCPOPT_VEXT 0 152 #define LCPOPT_MRU 1 153 #define LCPOPT_ACCM 2 154 #define LCPOPT_AP 3 155 #define LCPOPT_QP 4 156 #define LCPOPT_MN 5 157 #define LCPOPT_DEP6 6 158 #define LCPOPT_PFC 7 159 #define LCPOPT_ACFC 8 160 #define LCPOPT_FCSALT 9 161 #define LCPOPT_SDP 10 162 #define LCPOPT_NUMMODE 11 163 #define LCPOPT_DEP12 12 164 #define LCPOPT_CBACK 13 165 #define LCPOPT_DEP14 14 166 #define LCPOPT_DEP15 15 167 #define LCPOPT_DEP16 16 168 #define LCPOPT_MLMRRU 17 169 #define LCPOPT_MLSSNHF 18 170 #define LCPOPT_MLED 19 171 #define LCPOPT_PROP 20 172 #define LCPOPT_DCEID 21 173 #define LCPOPT_MPP 22 174 #define LCPOPT_LD 23 175 #define LCPOPT_LCPAOPT 24 176 #define LCPOPT_COBS 25 177 #define LCPOPT_PE 26 178 #define LCPOPT_MLHF 27 179 #define LCPOPT_I18N 28 180 #define LCPOPT_SDLOS 29 181 #define LCPOPT_PPPMUX 30 182 183 static const char *lcpconfopts[] = { 184 "Vend-Ext", /* (0) */ 185 "MRU", /* (1) */ 186 "ACCM", /* (2) */ 187 "Auth-Prot", /* (3) */ 188 "Qual-Prot", /* (4) */ 189 "Magic-Num", /* (5) */ 190 "deprecated(6)", /* used to be a Quality Protocol */ 191 "PFC", /* (7) */ 192 "ACFC", /* (8) */ 193 "FCS-Alt", /* (9) */ 194 "SDP", /* (10) */ 195 "Num-Mode", /* (11) */ 196 "deprecated(12)", /* used to be a Multi-Link-Procedure*/ 197 "Call-Back", /* (13) */ 198 "deprecated(14)", /* used to be a Connect-Time */ 199 "deprecated(15)", /* used to be a Compund-Frames */ 200 "deprecated(16)", /* used to be a Nominal-Data-Encap */ 201 "MRRU", /* (17) */ 202 "12-Bit seq #", /* (18) */ 203 "End-Disc", /* (19) */ 204 "Proprietary", /* (20) */ 205 "DCE-Id", /* (21) */ 206 "MP+", /* (22) */ 207 "Link-Disc", /* (23) */ 208 "LCP-Auth-Opt", /* (24) */ 209 "COBS", /* (25) */ 210 "Prefix-elision", /* (26) */ 211 "Multilink-header-Form",/* (27) */ 212 "I18N", /* (28) */ 213 "SDL-over-SONET/SDH", /* (29) */ 214 "PPP-Muxing", /* (30) */ 215 }; 216 217 #define NUM_LCPOPTS (sizeof(lcpconfopts) / sizeof(lcpconfopts[0])) 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 u_int print_lcp_config_options(netdissect_options *, const u_char *p, u_int); 406 static u_int print_ipcp_config_options(netdissect_options *, const u_char *p, u_int); 407 static u_int print_ip6cp_config_options(netdissect_options *, const u_char *p, u_int); 408 static u_int print_ccp_config_options(netdissect_options *, const u_char *p, u_int); 409 static u_int print_bacp_config_options(netdissect_options *, const u_char *p, u_int); 410 static void handle_ppp(netdissect_options *, u_int proto, const u_char *p, u_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, u_int length) 416 { 417 const char *typestr; 418 u_int code, len; 419 u_int (*pfunc)(netdissect_options *, const u_char *, u_int); 420 u_int tlen, advance; 421 const u_char *tptr; 422 423 tptr=pptr; 424 425 typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto); 426 ND_PRINT("%s, ", typestr); 427 428 if (length < 4) /* FIXME weak boundary checking */ 429 goto trunc; 430 ND_TCHECK_2(tptr); 431 432 code = GET_U_1(tptr); 433 tptr++; 434 435 ND_PRINT("%s (0x%02x), id %u, length %u", 436 tok2str(cpcodes, "Unknown Opcode",code), 437 code, 438 GET_U_1(tptr), /* ID */ 439 length + 2); 440 tptr++; 441 442 if (!ndo->ndo_vflag) 443 return; 444 445 len = GET_BE_U_2(tptr); 446 tptr += 2; 447 448 if (len < 4) { 449 ND_PRINT("\n\tencoded length %u (< 4))", len); 450 return; 451 } 452 453 if (len > length) { 454 ND_PRINT("\n\tencoded length %u (> packet length %u))", len, length); 455 return; 456 } 457 length = len; 458 459 ND_PRINT("\n\tencoded length %u (=Option(s) length %u)", len, len - 4); 460 461 if (length == 4) 462 return; /* there may be a NULL confreq etc. */ 463 464 if (ndo->ndo_vflag > 1) 465 print_unknown_data(ndo, pptr - 2, "\n\t", 6); 466 467 468 switch (code) { 469 case CPCODES_VEXT: 470 if (length < 11) 471 break; 472 ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr)); 473 tptr += 4; 474 ND_PRINT(" Vendor: %s (%u)", 475 tok2str(oui_values,"Unknown",GET_BE_U_3(tptr)), 476 GET_BE_U_3(tptr)); 477 /* XXX: need to decode Kind and Value(s)? */ 478 break; 479 case CPCODES_CONF_REQ: 480 case CPCODES_CONF_ACK: 481 case CPCODES_CONF_NAK: 482 case CPCODES_CONF_REJ: 483 tlen = len - 4; /* Code(1), Identifier(1) and Length(2) */ 484 do { 485 switch (proto) { 486 case PPP_LCP: 487 pfunc = print_lcp_config_options; 488 break; 489 case PPP_IPCP: 490 pfunc = print_ipcp_config_options; 491 break; 492 case PPP_IPV6CP: 493 pfunc = print_ip6cp_config_options; 494 break; 495 case PPP_CCP: 496 pfunc = print_ccp_config_options; 497 break; 498 case PPP_BACP: 499 pfunc = print_bacp_config_options; 500 break; 501 default: 502 /* 503 * No print routine for the options for 504 * this protocol. 505 */ 506 pfunc = NULL; 507 break; 508 } 509 510 if (pfunc == NULL) /* catch the above null pointer if unknown CP */ 511 break; 512 513 if ((advance = (*pfunc)(ndo, tptr, len)) == 0) 514 break; 515 if (tlen < advance) { 516 ND_PRINT(" [remaining options length %u < %u]", 517 tlen, advance); 518 nd_print_invalid(ndo); 519 break; 520 } 521 tlen -= advance; 522 tptr += advance; 523 } while (tlen != 0); 524 break; 525 526 case CPCODES_TERM_REQ: 527 case CPCODES_TERM_ACK: 528 /* XXX: need to decode Data? */ 529 break; 530 case CPCODES_CODE_REJ: 531 /* XXX: need to decode Rejected-Packet? */ 532 break; 533 case CPCODES_PROT_REJ: 534 if (length < 6) 535 break; 536 ND_PRINT("\n\t Rejected %s Protocol (0x%04x)", 537 tok2str(ppptype2str,"unknown", GET_BE_U_2(tptr)), 538 GET_BE_U_2(tptr)); 539 /* XXX: need to decode Rejected-Information? - hexdump for now */ 540 if (len > 6) { 541 ND_PRINT("\n\t Rejected Packet"); 542 print_unknown_data(ndo, tptr + 2, "\n\t ", len - 2); 543 } 544 break; 545 case CPCODES_ECHO_REQ: 546 case CPCODES_ECHO_RPL: 547 case CPCODES_DISC_REQ: 548 if (length < 8) 549 break; 550 ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr)); 551 /* XXX: need to decode Data? - hexdump for now */ 552 if (len > 8) { 553 ND_PRINT("\n\t -----trailing data-----"); 554 ND_TCHECK_LEN(tptr + 4, len - 8); 555 print_unknown_data(ndo, tptr + 4, "\n\t ", len - 8); 556 } 557 break; 558 case CPCODES_ID: 559 if (length < 8) 560 break; 561 ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr)); 562 /* RFC 1661 says this is intended to be human readable */ 563 if (len > 8) { 564 ND_PRINT("\n\t Message\n\t "); 565 if (nd_printn(ndo, tptr + 4, len - 4, ndo->ndo_snapend)) 566 goto trunc; 567 } 568 break; 569 case CPCODES_TIME_REM: 570 if (length < 12) 571 break; 572 ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr)); 573 ND_PRINT(", Seconds-Remaining %us", GET_BE_U_4(tptr + 4)); 574 /* XXX: need to decode Message? */ 575 break; 576 default: 577 /* XXX this is dirty but we do not get the 578 * original pointer passed to the begin 579 * the PPP packet */ 580 if (ndo->ndo_vflag <= 1) 581 print_unknown_data(ndo, pptr - 2, "\n\t ", length + 2); 582 break; 583 } 584 return; 585 586 trunc: 587 ND_PRINT("[|%s]", typestr); 588 } 589 590 /* LCP config options */ 591 static u_int 592 print_lcp_config_options(netdissect_options *ndo, 593 const u_char *p, u_int length) 594 { 595 u_int opt, len; 596 597 if (length < 2) 598 return 0; 599 ND_TCHECK_2(p); 600 opt = GET_U_1(p); 601 len = GET_U_1(p + 1); 602 if (length < len) 603 return 0; 604 if (len < 2) { 605 if (opt < NUM_LCPOPTS) 606 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 607 lcpconfopts[opt], opt, len); 608 else 609 ND_PRINT("\n\tunknown LCP option 0x%02x", opt); 610 return 0; 611 } 612 if (opt < NUM_LCPOPTS) 613 ND_PRINT("\n\t %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len); 614 else { 615 ND_PRINT("\n\tunknown LCP option 0x%02x", opt); 616 return len; 617 } 618 619 switch (opt) { 620 case LCPOPT_VEXT: 621 if (len < 6) { 622 ND_PRINT(" (length bogus, should be >= 6)"); 623 return len; 624 } 625 ND_PRINT(": Vendor: %s (%u)", 626 tok2str(oui_values,"Unknown",GET_BE_U_3(p + 2)), 627 GET_BE_U_3(p + 2)); 628 #if 0 629 ND_PRINT(", kind: 0x%02x", GET_U_1(p + 5)); 630 ND_PRINT(", Value: 0x"); 631 for (i = 0; i < len - 6; i++) { 632 ND_PRINT("%02x", GET_U_1(p + 6 + i)); 633 } 634 #endif 635 break; 636 case LCPOPT_MRU: 637 if (len != 4) { 638 ND_PRINT(" (length bogus, should be = 4)"); 639 return len; 640 } 641 ND_PRINT(": %u", GET_BE_U_2(p + 2)); 642 break; 643 case LCPOPT_ACCM: 644 if (len != 6) { 645 ND_PRINT(" (length bogus, should be = 6)"); 646 return len; 647 } 648 ND_PRINT(": 0x%08x", GET_BE_U_4(p + 2)); 649 break; 650 case LCPOPT_AP: 651 if (len < 4) { 652 ND_PRINT(" (length bogus, should be >= 4)"); 653 return len; 654 } 655 ND_PRINT(": %s", 656 tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", GET_BE_U_2(p + 2))); 657 658 switch (GET_BE_U_2(p + 2)) { 659 case PPP_CHAP: 660 ND_PRINT(", %s", 661 tok2str(authalg_values, "Unknown Auth Alg %u", GET_U_1(p + 4))); 662 break; 663 case PPP_PAP: /* fall through */ 664 case PPP_EAP: 665 case PPP_SPAP: 666 case PPP_SPAP_OLD: 667 break; 668 default: 669 print_unknown_data(ndo, p, "\n\t", len); 670 } 671 break; 672 case LCPOPT_QP: 673 if (len < 4) { 674 ND_PRINT(" (length bogus, should be >= 4)"); 675 return 0; 676 } 677 if (GET_BE_U_2(p + 2) == PPP_LQM) 678 ND_PRINT(": LQR"); 679 else 680 ND_PRINT(": unknown"); 681 break; 682 case LCPOPT_MN: 683 if (len != 6) { 684 ND_PRINT(" (length bogus, should be = 6)"); 685 return 0; 686 } 687 ND_PRINT(": 0x%08x", GET_BE_U_4(p + 2)); 688 break; 689 case LCPOPT_PFC: 690 break; 691 case LCPOPT_ACFC: 692 break; 693 case LCPOPT_LD: 694 if (len != 4) { 695 ND_PRINT(" (length bogus, should be = 4)"); 696 return 0; 697 } 698 ND_PRINT(": 0x%04x", GET_BE_U_2(p + 2)); 699 break; 700 case LCPOPT_CBACK: 701 if (len < 3) { 702 ND_PRINT(" (length bogus, should be >= 3)"); 703 return 0; 704 } 705 ND_PRINT(": "); 706 ND_PRINT(": Callback Operation %s (%u)", 707 tok2str(ppp_callback_values, "Unknown", GET_U_1(p + 2)), 708 GET_U_1(p + 2)); 709 break; 710 case LCPOPT_MLMRRU: 711 if (len != 4) { 712 ND_PRINT(" (length bogus, should be = 4)"); 713 return 0; 714 } 715 ND_PRINT(": %u", GET_BE_U_2(p + 2)); 716 break; 717 case LCPOPT_MLED: 718 if (len < 3) { 719 ND_PRINT(" (length bogus, should be >= 3)"); 720 return 0; 721 } 722 switch (GET_U_1(p + 2)) { /* class */ 723 case MEDCLASS_NULL: 724 ND_PRINT(": Null"); 725 break; 726 case MEDCLASS_LOCAL: 727 ND_PRINT(": Local"); /* XXX */ 728 break; 729 case MEDCLASS_IPV4: 730 if (len != 7) { 731 ND_PRINT(" (length bogus, should be = 7)"); 732 return 0; 733 } 734 ND_PRINT(": IPv4 %s", GET_IPADDR_STRING(p + 3)); 735 break; 736 case MEDCLASS_MAC: 737 if (len != 9) { 738 ND_PRINT(" (length bogus, should be = 9)"); 739 return 0; 740 } 741 ND_PRINT(": MAC %s", GET_ETHERADDR_STRING(p + 3)); 742 break; 743 case MEDCLASS_MNB: 744 ND_PRINT(": Magic-Num-Block"); /* XXX */ 745 break; 746 case MEDCLASS_PSNDN: 747 ND_PRINT(": PSNDN"); /* XXX */ 748 break; 749 default: 750 ND_PRINT(": Unknown class %u", GET_U_1(p + 2)); 751 break; 752 } 753 break; 754 755 /* XXX: to be supported */ 756 #if 0 757 case LCPOPT_DEP6: 758 case LCPOPT_FCSALT: 759 case LCPOPT_SDP: 760 case LCPOPT_NUMMODE: 761 case LCPOPT_DEP12: 762 case LCPOPT_DEP14: 763 case LCPOPT_DEP15: 764 case LCPOPT_DEP16: 765 case LCPOPT_MLSSNHF: 766 case LCPOPT_PROP: 767 case LCPOPT_DCEID: 768 case LCPOPT_MPP: 769 case LCPOPT_LCPAOPT: 770 case LCPOPT_COBS: 771 case LCPOPT_PE: 772 case LCPOPT_MLHF: 773 case LCPOPT_I18N: 774 case LCPOPT_SDLOS: 775 case LCPOPT_PPPMUX: 776 break; 777 #endif 778 default: 779 /* 780 * Unknown option; dump it as raw bytes now if we're 781 * not going to do so below. 782 */ 783 if (ndo->ndo_vflag < 2) 784 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); 785 break; 786 } 787 788 if (ndo->ndo_vflag > 1) 789 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */ 790 791 return len; 792 793 trunc: 794 ND_PRINT("[|lcp]"); 795 return 0; 796 } 797 798 /* ML-PPP*/ 799 static const struct tok ppp_ml_flag_values[] = { 800 { 0x80, "begin" }, 801 { 0x40, "end" }, 802 { 0, NULL } 803 }; 804 805 static void 806 handle_mlppp(netdissect_options *ndo, 807 const u_char *p, u_int length) 808 { 809 if (!ndo->ndo_eflag) 810 ND_PRINT("MLPPP, "); 811 812 if (length < 2) { 813 ND_PRINT("[|mlppp]"); 814 return; 815 } 816 if (!ND_TTEST_2(p)) { 817 ND_PRINT("[|mlppp]"); 818 return; 819 } 820 821 ND_PRINT("seq 0x%03x, Flags [%s], length %u", 822 (GET_BE_U_2(p))&0x0fff, 823 /* only support 12-Bit sequence space for now */ 824 bittok2str(ppp_ml_flag_values, "none", GET_U_1(p) & 0xc0), 825 length); 826 } 827 828 /* CHAP */ 829 static void 830 handle_chap(netdissect_options *ndo, 831 const u_char *p, u_int length) 832 { 833 u_int code, len; 834 u_int val_size, name_size, msg_size; 835 const u_char *p0; 836 u_int i; 837 838 p0 = p; 839 if (length < 1) { 840 ND_PRINT("[|chap]"); 841 return; 842 } else if (length < 4) { 843 ND_PRINT("[|chap 0x%02x]", GET_U_1(p)); 844 return; 845 } 846 847 code = GET_U_1(p); 848 ND_PRINT("CHAP, %s (0x%02x)", 849 tok2str(chapcode_values,"unknown",code), 850 code); 851 p++; 852 853 ND_PRINT(", id %u", GET_U_1(p)); /* ID */ 854 p++; 855 856 len = GET_BE_U_2(p); 857 p += 2; 858 859 /* 860 * Note that this is a generic CHAP decoding routine. Since we 861 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1, 862 * MS-CHAPv2) is used at this point, we can't decode packet 863 * specifically to each algorithms. Instead, we simply decode 864 * the GCD (Gratest Common Denominator) for all algorithms. 865 */ 866 switch (code) { 867 case CHAP_CHAL: 868 case CHAP_RESP: 869 if (length - (p - p0) < 1) 870 return; 871 val_size = GET_U_1(p); /* value size */ 872 p++; 873 if (length - (p - p0) < val_size) 874 return; 875 ND_PRINT(", Value "); 876 for (i = 0; i < val_size; i++) { 877 ND_PRINT("%02x", GET_U_1(p)); 878 p++; 879 } 880 name_size = len - (u_int)(p - p0); 881 ND_PRINT(", Name "); 882 for (i = 0; i < name_size; i++) { 883 fn_print_char(ndo, GET_U_1(p)); 884 p++; 885 } 886 break; 887 case CHAP_SUCC: 888 case CHAP_FAIL: 889 msg_size = len - (u_int)(p - p0); 890 ND_PRINT(", Msg "); 891 for (i = 0; i< msg_size; i++) { 892 fn_print_char(ndo, GET_U_1(p)); 893 p++; 894 } 895 break; 896 } 897 } 898 899 /* PAP (see RFC 1334) */ 900 static void 901 handle_pap(netdissect_options *ndo, 902 const u_char *p, u_int length) 903 { 904 u_int code, len; 905 u_int peerid_len, passwd_len, msg_len; 906 const u_char *p0; 907 u_int i; 908 909 p0 = p; 910 if (length < 1) { 911 ND_PRINT("[|pap]"); 912 return; 913 } else if (length < 4) { 914 ND_PRINT("[|pap 0x%02x]", GET_U_1(p)); 915 return; 916 } 917 918 code = GET_U_1(p); 919 ND_PRINT("PAP, %s (0x%02x)", 920 tok2str(papcode_values, "unknown", code), 921 code); 922 p++; 923 924 ND_PRINT(", id %u", GET_U_1(p)); /* ID */ 925 p++; 926 927 len = GET_BE_U_2(p); 928 p += 2; 929 930 if (len > length) { 931 ND_PRINT(", length %u > packet size", len); 932 return; 933 } 934 length = len; 935 if (length < (size_t)(p - p0)) { 936 ND_PRINT(", length %u < PAP header length", length); 937 return; 938 } 939 940 switch (code) { 941 case PAP_AREQ: 942 /* A valid Authenticate-Request is 6 or more octets long. */ 943 if (len < 6) 944 goto trunc; 945 if (length - (p - p0) < 1) 946 return; 947 peerid_len = GET_U_1(p); /* Peer-ID Length */ 948 p++; 949 if (length - (p - p0) < peerid_len) 950 return; 951 ND_PRINT(", Peer "); 952 for (i = 0; i < peerid_len; i++) { 953 fn_print_char(ndo, GET_U_1(p)); 954 p++; 955 } 956 957 if (length - (p - p0) < 1) 958 return; 959 passwd_len = GET_U_1(p); /* Password Length */ 960 p++; 961 if (length - (p - p0) < passwd_len) 962 return; 963 ND_PRINT(", Name "); 964 for (i = 0; i < passwd_len; i++) { 965 fn_print_char(ndo, GET_U_1(p)); 966 p++; 967 } 968 break; 969 case PAP_AACK: 970 case PAP_ANAK: 971 /* Although some implementations ignore truncation at 972 * this point and at least one generates a truncated 973 * packet, RFC 1334 section 2.2.2 clearly states that 974 * both AACK and ANAK are at least 5 bytes long. 975 */ 976 if (len < 5) 977 goto trunc; 978 if (length - (p - p0) < 1) 979 return; 980 msg_len = GET_U_1(p); /* Msg-Length */ 981 p++; 982 if (length - (p - p0) < msg_len) 983 return; 984 ND_PRINT(", Msg "); 985 for (i = 0; i< msg_len; i++) { 986 fn_print_char(ndo, GET_U_1(p)); 987 p++; 988 } 989 break; 990 } 991 return; 992 993 trunc: 994 ND_PRINT("[|pap]"); 995 } 996 997 /* BAP */ 998 static void 999 handle_bap(netdissect_options *ndo _U_, 1000 const u_char *p _U_, u_int length _U_) 1001 { 1002 /* XXX: to be supported!! */ 1003 } 1004 1005 1006 /* IPCP config options */ 1007 static u_int 1008 print_ipcp_config_options(netdissect_options *ndo, 1009 const u_char *p, u_int length) 1010 { 1011 u_int opt, len; 1012 u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen; 1013 1014 if (length < 2) 1015 return 0; 1016 ND_TCHECK_2(p); 1017 opt = GET_U_1(p); 1018 len = GET_U_1(p + 1); 1019 if (length < len) 1020 return 0; 1021 if (len < 2) { 1022 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1023 tok2str(ipcpopt_values,"unknown",opt), 1024 opt, 1025 len); 1026 return 0; 1027 } 1028 1029 ND_PRINT("\n\t %s Option (0x%02x), length %u", 1030 tok2str(ipcpopt_values,"unknown",opt), 1031 opt, 1032 len); 1033 1034 switch (opt) { 1035 case IPCPOPT_2ADDR: /* deprecated */ 1036 if (len != 10) { 1037 ND_PRINT(" (length bogus, should be = 10)"); 1038 return len; 1039 } 1040 ND_PRINT(": src %s, dst %s", 1041 GET_IPADDR_STRING(p + 2), 1042 GET_IPADDR_STRING(p + 6)); 1043 break; 1044 case IPCPOPT_IPCOMP: 1045 if (len < 4) { 1046 ND_PRINT(" (length bogus, should be >= 4)"); 1047 return 0; 1048 } 1049 compproto = GET_BE_U_2(p + 2); 1050 1051 ND_PRINT(": %s (0x%02x):", 1052 tok2str(ipcpopt_compproto_values, "Unknown", compproto), 1053 compproto); 1054 1055 switch (compproto) { 1056 case PPP_VJC: 1057 /* XXX: VJ-Comp parameters should be decoded */ 1058 break; 1059 case IPCPOPT_IPCOMP_HDRCOMP: 1060 if (len < IPCPOPT_IPCOMP_MINLEN) { 1061 ND_PRINT(" (length bogus, should be >= %u)", 1062 IPCPOPT_IPCOMP_MINLEN); 1063 return 0; 1064 } 1065 1066 ND_TCHECK_LEN(p + 2, IPCPOPT_IPCOMP_MINLEN); 1067 ND_PRINT("\n\t TCP Space %u, non-TCP Space %u" 1068 ", maxPeriod %u, maxTime %u, maxHdr %u", 1069 GET_BE_U_2(p + 4), 1070 GET_BE_U_2(p + 6), 1071 GET_BE_U_2(p + 8), 1072 GET_BE_U_2(p + 10), 1073 GET_BE_U_2(p + 12)); 1074 1075 /* suboptions present ? */ 1076 if (len > IPCPOPT_IPCOMP_MINLEN) { 1077 ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN; 1078 p += IPCPOPT_IPCOMP_MINLEN; 1079 1080 ND_PRINT("\n\t Suboptions, length %u", ipcomp_subopttotallen); 1081 1082 while (ipcomp_subopttotallen >= 2) { 1083 ND_TCHECK_2(p); 1084 ipcomp_subopt = GET_U_1(p); 1085 ipcomp_suboptlen = GET_U_1(p + 1); 1086 1087 /* sanity check */ 1088 if (ipcomp_subopt == 0 || 1089 ipcomp_suboptlen == 0 ) 1090 break; 1091 1092 /* XXX: just display the suboptions for now */ 1093 ND_PRINT("\n\t\t%s Suboption #%u, length %u", 1094 tok2str(ipcpopt_compproto_subopt_values, 1095 "Unknown", 1096 ipcomp_subopt), 1097 ipcomp_subopt, 1098 ipcomp_suboptlen); 1099 if (ipcomp_subopttotallen < ipcomp_suboptlen) { 1100 ND_PRINT(" [remaining suboptions length %u < %u]", 1101 ipcomp_subopttotallen, ipcomp_suboptlen); 1102 nd_print_invalid(ndo); 1103 break; 1104 } 1105 ipcomp_subopttotallen -= ipcomp_suboptlen; 1106 p += ipcomp_suboptlen; 1107 } 1108 } 1109 break; 1110 default: 1111 break; 1112 } 1113 break; 1114 1115 case IPCPOPT_ADDR: /* those options share the same format - fall through */ 1116 case IPCPOPT_MOBILE4: 1117 case IPCPOPT_PRIDNS: 1118 case IPCPOPT_PRINBNS: 1119 case IPCPOPT_SECDNS: 1120 case IPCPOPT_SECNBNS: 1121 if (len != 6) { 1122 ND_PRINT(" (length bogus, should be = 6)"); 1123 return 0; 1124 } 1125 ND_PRINT(": %s", GET_IPADDR_STRING(p + 2)); 1126 break; 1127 default: 1128 /* 1129 * Unknown option; dump it as raw bytes now if we're 1130 * not going to do so below. 1131 */ 1132 if (ndo->ndo_vflag < 2) 1133 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); 1134 break; 1135 } 1136 if (ndo->ndo_vflag > 1) 1137 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */ 1138 return len; 1139 1140 trunc: 1141 ND_PRINT("[|ipcp]"); 1142 return 0; 1143 } 1144 1145 /* IP6CP config options */ 1146 static u_int 1147 print_ip6cp_config_options(netdissect_options *ndo, 1148 const u_char *p, u_int length) 1149 { 1150 u_int opt, len; 1151 1152 if (length < 2) 1153 return 0; 1154 ND_TCHECK_2(p); 1155 opt = GET_U_1(p); 1156 len = GET_U_1(p + 1); 1157 if (length < len) 1158 return 0; 1159 if (len < 2) { 1160 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1161 tok2str(ip6cpopt_values,"unknown",opt), 1162 opt, 1163 len); 1164 return 0; 1165 } 1166 1167 ND_PRINT("\n\t %s Option (0x%02x), length %u", 1168 tok2str(ip6cpopt_values,"unknown",opt), 1169 opt, 1170 len); 1171 1172 switch (opt) { 1173 case IP6CP_IFID: 1174 if (len != 10) { 1175 ND_PRINT(" (length bogus, should be = 10)"); 1176 return len; 1177 } 1178 ND_TCHECK_8(p + 2); 1179 ND_PRINT(": %04x:%04x:%04x:%04x", 1180 GET_BE_U_2(p + 2), 1181 GET_BE_U_2(p + 4), 1182 GET_BE_U_2(p + 6), 1183 GET_BE_U_2(p + 8)); 1184 break; 1185 default: 1186 /* 1187 * Unknown option; dump it as raw bytes now if we're 1188 * not going to do so below. 1189 */ 1190 if (ndo->ndo_vflag < 2) 1191 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); 1192 break; 1193 } 1194 if (ndo->ndo_vflag > 1) 1195 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */ 1196 1197 return len; 1198 1199 trunc: 1200 ND_PRINT("[|ip6cp]"); 1201 return 0; 1202 } 1203 1204 1205 /* CCP config options */ 1206 static u_int 1207 print_ccp_config_options(netdissect_options *ndo, 1208 const u_char *p, u_int length) 1209 { 1210 u_int opt, len; 1211 1212 if (length < 2) 1213 return 0; 1214 ND_TCHECK_2(p); 1215 opt = GET_U_1(p); 1216 len = GET_U_1(p + 1); 1217 if (length < len) 1218 return 0; 1219 if (len < 2) { 1220 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1221 tok2str(ccpconfopts_values, "Unknown", opt), 1222 opt, 1223 len); 1224 return 0; 1225 } 1226 1227 ND_PRINT("\n\t %s Option (0x%02x), length %u", 1228 tok2str(ccpconfopts_values, "Unknown", opt), 1229 opt, 1230 len); 1231 1232 switch (opt) { 1233 case CCPOPT_BSDCOMP: 1234 if (len < 3) { 1235 ND_PRINT(" (length bogus, should be >= 3)"); 1236 return len; 1237 } 1238 ND_PRINT(": Version: %u, Dictionary Bits: %u", 1239 GET_U_1(p + 2) >> 5, 1240 GET_U_1(p + 2) & 0x1f); 1241 break; 1242 case CCPOPT_MVRCA: 1243 if (len < 4) { 1244 ND_PRINT(" (length bogus, should be >= 4)"); 1245 return len; 1246 } 1247 ND_PRINT(": Features: %u, PxP: %s, History: %u, #CTX-ID: %u", 1248 (GET_U_1(p + 2) & 0xc0) >> 6, 1249 (GET_U_1(p + 2) & 0x20) ? "Enabled" : "Disabled", 1250 GET_U_1(p + 2) & 0x1f, 1251 GET_U_1(p + 3)); 1252 break; 1253 case CCPOPT_DEFLATE: 1254 if (len < 4) { 1255 ND_PRINT(" (length bogus, should be >= 4)"); 1256 return len; 1257 } 1258 ND_PRINT(": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u", 1259 (GET_U_1(p + 2) & 0xf0) >> 4, 1260 ((GET_U_1(p + 2) & 0x0f) == 8) ? "zlib" : "unknown", 1261 GET_U_1(p + 2) & 0x0f, 1262 (GET_U_1(p + 3) & 0xfc) >> 2, 1263 GET_U_1(p + 3) & 0x03); 1264 break; 1265 1266 /* XXX: to be supported */ 1267 #if 0 1268 case CCPOPT_OUI: 1269 case CCPOPT_PRED1: 1270 case CCPOPT_PRED2: 1271 case CCPOPT_PJUMP: 1272 case CCPOPT_HPPPC: 1273 case CCPOPT_STACLZS: 1274 case CCPOPT_MPPC: 1275 case CCPOPT_GFZA: 1276 case CCPOPT_V42BIS: 1277 case CCPOPT_LZSDCP: 1278 case CCPOPT_DEC: 1279 case CCPOPT_RESV: 1280 break; 1281 #endif 1282 default: 1283 /* 1284 * Unknown option; dump it as raw bytes now if we're 1285 * not going to do so below. 1286 */ 1287 if (ndo->ndo_vflag < 2) 1288 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); 1289 break; 1290 } 1291 if (ndo->ndo_vflag > 1) 1292 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */ 1293 1294 return len; 1295 1296 trunc: 1297 ND_PRINT("[|ccp]"); 1298 return 0; 1299 } 1300 1301 /* BACP config options */ 1302 static u_int 1303 print_bacp_config_options(netdissect_options *ndo, 1304 const u_char *p, u_int length) 1305 { 1306 u_int opt, len; 1307 1308 if (length < 2) 1309 return 0; 1310 ND_TCHECK_2(p); 1311 opt = GET_U_1(p); 1312 len = GET_U_1(p + 1); 1313 if (length < len) 1314 return 0; 1315 if (len < 2) { 1316 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)", 1317 tok2str(bacconfopts_values, "Unknown", opt), 1318 opt, 1319 len); 1320 return 0; 1321 } 1322 1323 ND_PRINT("\n\t %s Option (0x%02x), length %u", 1324 tok2str(bacconfopts_values, "Unknown", opt), 1325 opt, 1326 len); 1327 1328 switch (opt) { 1329 case BACPOPT_FPEER: 1330 if (len != 6) { 1331 ND_PRINT(" (length bogus, should be = 6)"); 1332 return len; 1333 } 1334 ND_PRINT(": Magic-Num 0x%08x", GET_BE_U_4(p + 2)); 1335 break; 1336 default: 1337 /* 1338 * Unknown option; dump it as raw bytes now if we're 1339 * not going to do so below. 1340 */ 1341 if (ndo->ndo_vflag < 2) 1342 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); 1343 break; 1344 } 1345 if (ndo->ndo_vflag > 1) 1346 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */ 1347 1348 return len; 1349 1350 trunc: 1351 ND_PRINT("[|bacp]"); 1352 return 0; 1353 } 1354 1355 /* 1356 * Un-escape RFC 1662 PPP in HDLC-like framing, with octet escapes. 1357 * The length argument is the on-the-wire length, not the captured 1358 * length; we can only un-escape the captured part. 1359 */ 1360 static void 1361 ppp_hdlc(netdissect_options *ndo, 1362 const u_char *p, u_int length) 1363 { 1364 u_int caplen = ND_BYTES_AVAILABLE_AFTER(p); 1365 u_char *b, *t, c; 1366 const u_char *s; 1367 u_int i, proto; 1368 1369 if (caplen == 0) 1370 return; 1371 1372 if (length == 0) 1373 return; 1374 1375 b = (u_char *)malloc(caplen); 1376 if (b == NULL) { 1377 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC, 1378 "%s: malloc", __func__); 1379 } 1380 1381 /* 1382 * Unescape all the data into a temporary, private, buffer. 1383 * Do this so that we don't overwrite the original packet 1384 * contents. 1385 */ 1386 for (s = p, t = b, i = caplen; i != 0; i--) { 1387 c = GET_U_1(s); 1388 s++; 1389 if (c == 0x7d) { 1390 if (i <= 1) 1391 break; 1392 i--; 1393 c = GET_U_1(s) ^ 0x20; 1394 s++; 1395 } 1396 *t++ = c; 1397 } 1398 1399 /* 1400 * Switch to the output buffer for dissection, and save it 1401 * on the buffer stack so it can be freed; our caller must 1402 * pop it when done. 1403 */ 1404 if (!nd_push_buffer(ndo, b, b, (u_int)(t - b))) { 1405 free(b); 1406 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC, 1407 "%s: can't push buffer on buffer stack", __func__); 1408 } 1409 length = ND_BYTES_AVAILABLE_AFTER(b); 1410 1411 /* now lets guess about the payload codepoint format */ 1412 if (length < 1) 1413 goto trunc; 1414 proto = GET_U_1(b); /* start with a one-octet codepoint guess */ 1415 1416 switch (proto) { 1417 case PPP_IP: 1418 ip_print(ndo, b + 1, length - 1); 1419 goto cleanup; 1420 case PPP_IPV6: 1421 ip6_print(ndo, b + 1, length - 1); 1422 goto cleanup; 1423 default: /* no luck - try next guess */ 1424 break; 1425 } 1426 1427 if (length < 2) 1428 goto trunc; 1429 proto = GET_BE_U_2(b); /* next guess - load two octets */ 1430 1431 switch (proto) { 1432 case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */ 1433 if (length < 4) 1434 goto trunc; 1435 proto = GET_BE_U_2(b + 2); /* load the PPP proto-id */ 1436 if ((proto & 0xff00) == 0x7e00) 1437 ND_PRINT("(protocol 0x%04x invalid)", proto); 1438 else 1439 handle_ppp(ndo, proto, b + 4, length - 4); 1440 break; 1441 default: /* last guess - proto must be a PPP proto-id */ 1442 if ((proto & 0xff00) == 0x7e00) 1443 ND_PRINT("(protocol 0x%04x invalid)", proto); 1444 else 1445 handle_ppp(ndo, proto, b + 2, length - 2); 1446 break; 1447 } 1448 1449 cleanup: 1450 nd_pop_packet_info(ndo); 1451 return; 1452 1453 trunc: 1454 nd_pop_packet_info(ndo); 1455 nd_print_trunc(ndo); 1456 } 1457 1458 1459 /* PPP */ 1460 static void 1461 handle_ppp(netdissect_options *ndo, 1462 u_int proto, const u_char *p, u_int length) 1463 { 1464 if ((proto & 0xff00) == 0x7e00) { /* is this an escape code ? */ 1465 ppp_hdlc(ndo, p - 1, length); 1466 return; 1467 } 1468 1469 switch (proto) { 1470 case PPP_LCP: /* fall through */ 1471 case PPP_IPCP: 1472 case PPP_OSICP: 1473 case PPP_MPLSCP: 1474 case PPP_IPV6CP: 1475 case PPP_CCP: 1476 case PPP_BACP: 1477 handle_ctrl_proto(ndo, proto, p, length); 1478 break; 1479 case PPP_ML: 1480 handle_mlppp(ndo, p, length); 1481 break; 1482 case PPP_CHAP: 1483 handle_chap(ndo, p, length); 1484 break; 1485 case PPP_PAP: 1486 handle_pap(ndo, p, length); 1487 break; 1488 case PPP_BAP: /* XXX: not yet completed */ 1489 handle_bap(ndo, p, length); 1490 break; 1491 case ETHERTYPE_IP: /*XXX*/ 1492 case PPP_VJNC: 1493 case PPP_IP: 1494 ip_print(ndo, p, length); 1495 break; 1496 case ETHERTYPE_IPV6: /*XXX*/ 1497 case PPP_IPV6: 1498 ip6_print(ndo, p, length); 1499 break; 1500 case ETHERTYPE_IPX: /*XXX*/ 1501 case PPP_IPX: 1502 ipx_print(ndo, p, length); 1503 break; 1504 case PPP_OSI: 1505 isoclns_print(ndo, p, length); 1506 break; 1507 case PPP_MPLS_UCAST: 1508 case PPP_MPLS_MCAST: 1509 mpls_print(ndo, p, length); 1510 break; 1511 case PPP_COMP: 1512 ND_PRINT("compressed PPP data"); 1513 break; 1514 default: 1515 ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); 1516 print_unknown_data(ndo, p, "\n\t", length); 1517 break; 1518 } 1519 } 1520 1521 /* Standard PPP printer */ 1522 u_int 1523 ppp_print(netdissect_options *ndo, 1524 const u_char *p, u_int length) 1525 { 1526 u_int proto,ppp_header; 1527 u_int olen = length; /* _o_riginal length */ 1528 u_int hdr_len = 0; 1529 1530 ndo->ndo_protocol = "ppp"; 1531 /* 1532 * Here, we assume that p points to the Address and Control 1533 * field (if they present). 1534 */ 1535 if (length < 2) 1536 goto trunc; 1537 ppp_header = GET_BE_U_2(p); 1538 1539 switch(ppp_header) { 1540 case (PPP_PPPD_IN << 8 | PPP_CONTROL): 1541 if (ndo->ndo_eflag) ND_PRINT("In "); 1542 p += 2; 1543 length -= 2; 1544 hdr_len += 2; 1545 break; 1546 case (PPP_PPPD_OUT << 8 | PPP_CONTROL): 1547 if (ndo->ndo_eflag) ND_PRINT("Out "); 1548 p += 2; 1549 length -= 2; 1550 hdr_len += 2; 1551 break; 1552 case (PPP_ADDRESS << 8 | PPP_CONTROL): 1553 p += 2; /* ACFC not used */ 1554 length -= 2; 1555 hdr_len += 2; 1556 break; 1557 1558 default: 1559 break; 1560 } 1561 1562 if (length < 2) 1563 goto trunc; 1564 if (GET_U_1(p) % 2) { 1565 proto = GET_U_1(p); /* PFC is used */ 1566 p++; 1567 length--; 1568 hdr_len++; 1569 } else { 1570 proto = GET_BE_U_2(p); 1571 p += 2; 1572 length -= 2; 1573 hdr_len += 2; 1574 } 1575 1576 if (ndo->ndo_eflag) { 1577 const char *typestr; 1578 typestr = tok2str(ppptype2str, "unknown", proto); 1579 ND_PRINT("%s (0x%04x), length %u", 1580 typestr, 1581 proto, 1582 olen); 1583 if (*typestr == 'u') /* "unknown" */ 1584 return hdr_len; 1585 1586 ND_PRINT(": "); 1587 } 1588 1589 handle_ppp(ndo, proto, p, length); 1590 return (hdr_len); 1591 trunc: 1592 nd_print_trunc(ndo); 1593 return (0); 1594 } 1595 1596 1597 /* PPP I/F printer */ 1598 void 1599 ppp_if_print(netdissect_options *ndo, 1600 const struct pcap_pkthdr *h, const u_char *p) 1601 { 1602 u_int length = h->len; 1603 u_int caplen = h->caplen; 1604 1605 ndo->ndo_protocol = "ppp"; 1606 if (caplen < PPP_HDRLEN) { 1607 nd_print_trunc(ndo); 1608 ndo->ndo_ll_hdr_len += caplen; 1609 return; 1610 } 1611 ndo->ndo_ll_hdr_len += PPP_HDRLEN; 1612 1613 #if 0 1614 /* 1615 * XXX: seems to assume that there are 2 octets prepended to an 1616 * actual PPP frame. The 1st octet looks like Input/Output flag 1617 * while 2nd octet is unknown, at least to me 1618 * (mshindo@mshindo.net). 1619 * 1620 * That was what the original tcpdump code did. 1621 * 1622 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound 1623 * packets and 0 for inbound packets - but only if the 1624 * protocol field has the 0x8000 bit set (i.e., it's a network 1625 * control protocol); it does so before running the packet through 1626 * "bpf_filter" to see if it should be discarded, and to see 1627 * if we should update the time we sent the most recent packet... 1628 * 1629 * ...but it puts the original address field back after doing 1630 * so. 1631 * 1632 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion. 1633 * 1634 * I don't know if any PPP implementation handed up to a BPF 1635 * device packets with the first octet being 1 for outbound and 1636 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know 1637 * whether that ever needs to be checked or not. 1638 * 1639 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP, 1640 * and its tcpdump appears to assume that the frame always 1641 * begins with an address field and a control field, and that 1642 * the address field might be 0x0f or 0x8f, for Cisco 1643 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1644 * 1547, as well as 0xff, for PPP in HDLC-like framing as per 1645 * RFC 1662. 1646 * 1647 * (Is the Cisco framing in question what DLT_C_HDLC, in 1648 * BSD/OS, is?) 1649 */ 1650 if (ndo->ndo_eflag) 1651 ND_PRINT("%c %4d %02x ", GET_U_1(p) ? 'O' : 'I', 1652 length, GET_U_1(p + 1)); 1653 #endif 1654 1655 ppp_print(ndo, p, length); 1656 } 1657 1658 /* 1659 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like 1660 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547, 1661 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL, 1662 * discard them *if* those are the first two octets, and parse the remaining 1663 * packet as a PPP packet, as "ppp_print()" does). 1664 * 1665 * This handles, for example, DLT_PPP_SERIAL in NetBSD. 1666 */ 1667 void 1668 ppp_hdlc_if_print(netdissect_options *ndo, 1669 const struct pcap_pkthdr *h, const u_char *p) 1670 { 1671 u_int length = h->len; 1672 u_int caplen = h->caplen; 1673 u_int proto; 1674 u_int hdrlen = 0; 1675 1676 ndo->ndo_protocol = "ppp_hdlc"; 1677 if (caplen < 2) { 1678 nd_print_trunc(ndo); 1679 ndo->ndo_ll_hdr_len += caplen; 1680 return; 1681 } 1682 1683 switch (GET_U_1(p)) { 1684 1685 case PPP_ADDRESS: 1686 if (caplen < 4) { 1687 nd_print_trunc(ndo); 1688 ndo->ndo_ll_hdr_len += caplen; 1689 return; 1690 } 1691 1692 if (ndo->ndo_eflag) 1693 ND_PRINT("%02x %02x %u ", GET_U_1(p), 1694 GET_U_1(p + 1), length); 1695 p += 2; 1696 length -= 2; 1697 hdrlen += 2; 1698 1699 proto = GET_BE_U_2(p); 1700 p += 2; 1701 length -= 2; 1702 hdrlen += 2; 1703 ND_PRINT("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); 1704 1705 handle_ppp(ndo, proto, p, length); 1706 break; 1707 1708 case CHDLC_UNICAST: 1709 case CHDLC_BCAST: 1710 chdlc_if_print(ndo, h, p); 1711 return; 1712 1713 default: 1714 if (caplen < 4) { 1715 nd_print_trunc(ndo); 1716 ndo->ndo_ll_hdr_len += caplen; 1717 return; 1718 } 1719 1720 if (ndo->ndo_eflag) 1721 ND_PRINT("%02x %02x %u ", GET_U_1(p), 1722 GET_U_1(p + 1), length); 1723 p += 2; 1724 hdrlen += 2; 1725 1726 /* 1727 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats 1728 * the next two octets as an Ethernet type; does that 1729 * ever happen? 1730 */ 1731 ND_PRINT("unknown addr %02x; ctrl %02x", GET_U_1(p), 1732 GET_U_1(p + 1)); 1733 break; 1734 } 1735 1736 ndo->ndo_ll_hdr_len += hdrlen; 1737 } 1738 1739 #define PPP_BSDI_HDRLEN 24 1740 1741 /* BSD/OS specific PPP printer */ 1742 void 1743 ppp_bsdos_if_print(netdissect_options *ndo, 1744 const struct pcap_pkthdr *h _U_, const u_char *p _U_) 1745 { 1746 u_int hdrlength; 1747 #ifdef __bsdi__ 1748 u_int length = h->len; 1749 u_int caplen = h->caplen; 1750 uint16_t ptype; 1751 uint8_t llhl; 1752 const u_char *q; 1753 u_int i; 1754 1755 ndo->ndo_protocol = "ppp_bsdos"; 1756 if (caplen < PPP_BSDI_HDRLEN) { 1757 nd_print_trunc(ndo); 1758 ndo->ndo_ll_hdr_len += caplen; 1759 return; 1760 } 1761 1762 hdrlength = 0; 1763 1764 #if 0 1765 if (GET_U_1(p) == PPP_ADDRESS && 1766 GET_U_1(p + 1) == PPP_CONTROL) { 1767 if (ndo->ndo_eflag) 1768 ND_PRINT("%02x %02x ", GET_U_1(p), 1769 GET_U_1(p + 1)); 1770 p += 2; 1771 hdrlength = 2; 1772 } 1773 1774 if (ndo->ndo_eflag) 1775 ND_PRINT("%u ", length); 1776 /* Retrieve the protocol type */ 1777 if (GET_U_1(p) & 01) { 1778 /* Compressed protocol field */ 1779 ptype = GET_U_1(p); 1780 if (ndo->ndo_eflag) 1781 ND_PRINT("%02x ", ptype); 1782 p++; 1783 hdrlength += 1; 1784 } else { 1785 /* Un-compressed protocol field */ 1786 ptype = GET_BE_U_2(p); 1787 if (ndo->ndo_eflag) 1788 ND_PRINT("%04x ", ptype); 1789 p += 2; 1790 hdrlength += 2; 1791 } 1792 #else 1793 ptype = 0; /*XXX*/ 1794 if (ndo->ndo_eflag) 1795 ND_PRINT("%c ", GET_U_1(p + SLC_DIR) ? 'O' : 'I'); 1796 llhl = GET_U_1(p + SLC_LLHL); 1797 if (llhl) { 1798 /* link level header */ 1799 struct ppp_header *ph; 1800 1801 q = p + SLC_BPFHDRLEN; 1802 ph = (struct ppp_header *)q; 1803 if (ph->phdr_addr == PPP_ADDRESS 1804 && ph->phdr_ctl == PPP_CONTROL) { 1805 if (ndo->ndo_eflag) 1806 ND_PRINT("%02x %02x ", GET_U_1(q), 1807 GET_U_1(q + 1)); 1808 ptype = GET_BE_U_2(&ph->phdr_type); 1809 if (ndo->ndo_eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) { 1810 ND_PRINT("%s ", tok2str(ppptype2str, 1811 "proto-#%u", ptype)); 1812 } 1813 } else { 1814 if (ndo->ndo_eflag) { 1815 ND_PRINT("LLH=["); 1816 for (i = 0; i < llhl; i++) 1817 ND_PRINT("%02x", GET_U_1(q + i)); 1818 ND_PRINT("] "); 1819 } 1820 } 1821 } 1822 if (ndo->ndo_eflag) 1823 ND_PRINT("%u ", length); 1824 if (GET_U_1(p + SLC_CHL)) { 1825 q = p + SLC_BPFHDRLEN + llhl; 1826 1827 switch (ptype) { 1828 case PPP_VJC: 1829 ptype = vjc_print(ndo, q, ptype); 1830 hdrlength = PPP_BSDI_HDRLEN; 1831 p += hdrlength; 1832 switch (ptype) { 1833 case PPP_IP: 1834 ip_print(ndo, p, length); 1835 break; 1836 case PPP_IPV6: 1837 ip6_print(ndo, p, length); 1838 break; 1839 case PPP_MPLS_UCAST: 1840 case PPP_MPLS_MCAST: 1841 mpls_print(ndo, p, length); 1842 break; 1843 } 1844 goto printx; 1845 case PPP_VJNC: 1846 ptype = vjc_print(ndo, q, ptype); 1847 hdrlength = PPP_BSDI_HDRLEN; 1848 p += hdrlength; 1849 switch (ptype) { 1850 case PPP_IP: 1851 ip_print(ndo, p, length); 1852 break; 1853 case PPP_IPV6: 1854 ip6_print(ndo, p, length); 1855 break; 1856 case PPP_MPLS_UCAST: 1857 case PPP_MPLS_MCAST: 1858 mpls_print(ndo, p, length); 1859 break; 1860 } 1861 goto printx; 1862 default: 1863 if (ndo->ndo_eflag) { 1864 ND_PRINT("CH=["); 1865 for (i = 0; i < llhl; i++) 1866 ND_PRINT("%02x", 1867 GET_U_1(q + i)); 1868 ND_PRINT("] "); 1869 } 1870 break; 1871 } 1872 } 1873 1874 hdrlength = PPP_BSDI_HDRLEN; 1875 #endif 1876 1877 length -= hdrlength; 1878 p += hdrlength; 1879 1880 switch (ptype) { 1881 case PPP_IP: 1882 ip_print(p, length); 1883 break; 1884 case PPP_IPV6: 1885 ip6_print(ndo, p, length); 1886 break; 1887 case PPP_MPLS_UCAST: 1888 case PPP_MPLS_MCAST: 1889 mpls_print(ndo, p, length); 1890 break; 1891 default: 1892 ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype)); 1893 } 1894 1895 printx: 1896 #else /* __bsdi */ 1897 hdrlength = 0; 1898 #endif /* __bsdi__ */ 1899 ndo->ndo_ll_hdr_len += hdrlength; 1900 } 1901