contrib/tcpdump/print-ppp.c

   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
  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@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@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  */