The Tcpdump Group git mirrors - tcpdump/blob - print-ldp.c

   1 /*
   2  * Redistribution and use in source and binary forms, with or without
   3  * modification, are permitted provided that: (1) source code
   4  * distributions retain the above copyright notice and this paragraph
   5  * in its entirety, and (2) distributions including binary code include
   6  * the above copyright notice and this paragraph in its entirety in
   7  * the documentation or other materials provided with the distribution.
   8  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
   9  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  10  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  11  * FOR A PARTICULAR PURPOSE.
  12  *
  13  * Original code by Hannes Gredler (hannes@juniper.net)
  14  *  and Steinar Haug (sthaug@nethelp.no)
  15  */
  16
  17 #ifndef lint
  18 static const char rcsid[] _U_ =
  19     "@(#) $Header: /tcpdump/master/tcpdump/print-ldp.c,v 1.8.2.8 2006-02-03 08:42:30 hannes Exp $";
  20 #endif
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include "interface.h"
  33 #include "decode_prefix.h"
  34 #include "extract.h"
  35 #include "addrtoname.h"
  36
  37 #include "l2vpn.h"
  38
  39 /*
  40  * ldp common header
  41  *
  42  *  0                   1                   2                   3
  43  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  44  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  45  * |  Version                      |         PDU Length            |
  46  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  47  * |                         LDP Identifier                        |
  48  * +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  49  * |                               |
  50  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  51  *
  52  */
  53
  54 struct ldp_common_header {
  55     u_int8_t version[2];
  56     u_int8_t pdu_length[2];
  57     u_int8_t lsr_id[4];
  58     u_int8_t label_space[2];
  59 };
  60
  61 #define LDP_VERSION 1
  62
  63 /*
  64  * ldp message header
  65  *
  66  *  0                   1                   2                   3
  67  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  68  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  69  * |U|   Message Type              |      Message Length           |
  70  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  71  * |                     Message ID                                |
  72  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  73  * |                                                               |
  74  * +                                                               +
  75  * |                     Mandatory Parameters                      |
  76  * +                                                               +
  77  * |                                                               |
  78  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  79  * |                                                               |
  80  * +                                                               +
  81  * |                     Optional Parameters                       |
  82  * +                                                               +
  83  * |                                                               |
  84  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  85  */
  86
  87 struct ldp_msg_header {
  88     u_int8_t type[2];
  89     u_int8_t length[2];
  90     u_int8_t id[4];
  91 };
  92
  93 #define LDP_MASK_MSG_TYPE(x)  ((x)&0x7fff)
  94 #define LDP_MASK_U_BIT(x)     ((x)&0x8000)
  95
  96 #define LDP_MSG_NOTIF                0x0001
  97 #define LDP_MSG_HELLO                0x0100
  98 #define LDP_MSG_INIT                 0x0200
  99 #define LDP_MSG_KEEPALIVE            0x0201
 100 #define LDP_MSG_ADDRESS              0x0300
 101 #define LDP_MSG_ADDRESS_WITHDRAW     0x0301
 102 #define LDP_MSG_LABEL_MAPPING        0x0400
 103 #define LDP_MSG_LABEL_REQUEST        0x0401
 104 #define LDP_MSG_LABEL_WITHDRAW       0x0402
 105 #define LDP_MSG_LABEL_RELEASE        0x0403
 106 #define LDP_MSG_LABEL_ABORT_REQUEST  0x0404
 107
 108 #define LDP_VENDOR_PRIVATE_MIN       0x3e00
 109 #define LDP_VENDOR_PRIVATE_MAX       0x3eff
 110 #define LDP_EXPERIMENTAL_MIN         0x3f00
 111 #define LDP_EXPERIMENTAL_MAX         0x3fff
 112
 113 static const struct tok ldp_msg_values[] = {
 114     { LDP_MSG_NOTIF,                 "Notification" },
 115     { LDP_MSG_HELLO,                 "Hello" },
 116     { LDP_MSG_INIT,                  "Initialization" },
 117     { LDP_MSG_KEEPALIVE,             "Keepalive" },
 118     { LDP_MSG_ADDRESS,               "Address" },
 119     { LDP_MSG_ADDRESS_WITHDRAW,      "Address Withdraw" },
 120     { LDP_MSG_LABEL_MAPPING,         "Label Mapping" },
 121     { LDP_MSG_LABEL_REQUEST,         "Label Request" },
 122     { LDP_MSG_LABEL_WITHDRAW,        "Label Withdraw" },
 123     { LDP_MSG_LABEL_RELEASE,         "Label Release" },
 124     { LDP_MSG_LABEL_ABORT_REQUEST,   "Label Abort Request" },
 125     { 0, NULL}
 126 };
 127
 128 #define LDP_MASK_TLV_TYPE(x)  ((x)&0x3fff)
 129 #define LDP_MASK_F_BIT(x) ((x)&0x4000)
 130
 131 #define LDP_TLV_FEC                  0x0100
 132 #define LDP_TLV_ADDRESS_LIST         0x0101
 133 #define LDP_TLV_HOP_COUNT            0x0103
 134 #define LDP_TLV_PATH_VECTOR          0x0104
 135 #define LDP_TLV_GENERIC_LABEL        0x0200
 136 #define LDP_TLV_ATM_LABEL            0x0201
 137 #define LDP_TLV_FR_LABEL             0x0202
 138 #define LDP_TLV_STATUS               0x0300
 139 #define LDP_TLV_EXTD_STATUS          0x0301
 140 #define LDP_TLV_RETURNED_PDU         0x0302
 141 #define LDP_TLV_RETURNED_MSG         0x0303
 142 #define LDP_TLV_COMMON_HELLO         0x0400
 143 #define LDP_TLV_IPV4_TRANSPORT_ADDR  0x0401
 144 #define LDP_TLV_CONFIG_SEQ_NUMBER    0x0402
 145 #define LDP_TLV_IPV6_TRANSPORT_ADDR  0x0403
 146 #define LDP_TLV_COMMON_SESSION       0x0500
 147 #define LDP_TLV_ATM_SESSION_PARM     0x0501
 148 #define LDP_TLV_FR_SESSION_PARM      0x0502
 149 #define LDP_TLV_FT_SESSION           0x0503
 150 #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
 151
 152 static const struct tok ldp_tlv_values[] = {
 153     { LDP_TLV_FEC,                   "FEC" },
 154     { LDP_TLV_ADDRESS_LIST,          "Address List" },
 155     { LDP_TLV_HOP_COUNT,             "Hop Count" },
 156     { LDP_TLV_PATH_VECTOR,           "Path Vector" },
 157     { LDP_TLV_GENERIC_LABEL,         "Generic Label" },
 158     { LDP_TLV_ATM_LABEL,             "ATM Label" },
 159     { LDP_TLV_FR_LABEL,              "Frame-Relay Label" },
 160     { LDP_TLV_STATUS,                "Status" },
 161     { LDP_TLV_EXTD_STATUS,           "Extended Status" },
 162     { LDP_TLV_RETURNED_PDU,          "Returned PDU" },
 163     { LDP_TLV_RETURNED_MSG,          "Returned Message" },
 164     { LDP_TLV_COMMON_HELLO,          "Common Hello Parameters" },
 165     { LDP_TLV_IPV4_TRANSPORT_ADDR,   "IPv4 Transport Address" },
 166     { LDP_TLV_CONFIG_SEQ_NUMBER,     "Configuration Sequence Number" },
 167     { LDP_TLV_IPV6_TRANSPORT_ADDR,   "IPv6 Transport Address" },
 168     { LDP_TLV_COMMON_SESSION,        "Common Session Parameters" },
 169     { LDP_TLV_ATM_SESSION_PARM,      "ATM Session Parameters" },
 170     { LDP_TLV_FR_SESSION_PARM,       "Frame-Relay Session Parameters" },
 171     { LDP_TLV_FT_SESSION,            "Fault-Tolerant Session Parameters" },
 172     { LDP_TLV_LABEL_REQUEST_MSG_ID,  "Label Request Message ID" },
 173     { 0, NULL}
 174 };
 175
 176 #define LDP_FEC_WILDCARD        0x01
 177 #define LDP_FEC_PREFIX          0x02
 178 #define LDP_FEC_HOSTADDRESS     0x03
 179 /* From draft-martini-l2circuit-trans-mpls-13.txt */
 180 #define LDP_FEC_MARTINI_VC      0x80
 181
 182 static const struct tok ldp_fec_values[] = {
 183     { LDP_FEC_WILDCARD,         "Wildcard" },
 184     { LDP_FEC_PREFIX,           "Prefix" },
 185     { LDP_FEC_HOSTADDRESS,      "Host address" },
 186     { LDP_FEC_MARTINI_VC,       "Martini VC" },
 187     { 0, NULL}
 188 };
 189
 190 #define LDP_FEC_MARTINI_IFPARM_MTU  0x01
 191 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
 192 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
 193
 194 static const struct tok ldp_fec_martini_ifparm_values[] = {
 195     { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
 196     { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
 197     { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
 198     { 0, NULL}
 199 };
 200
 201 /* draft-ietf-pwe3-vccv-04.txt */
 202 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
 203     { 0x01, "PWE3 control word" },
 204     { 0x02, "MPLS Router Alert Label" },
 205     { 0x04, "MPLS inner label TTL = 1" },
 206     { 0, NULL}
 207 };
 208
 209 /* draft-ietf-pwe3-vccv-04.txt */
 210 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
 211     { 0x01, "ICMP Ping" },
 212     { 0x02, "LSP Ping" },
 213     { 0x04, "BFD" },
 214     { 0, NULL}
 215 };
 216
 217 /* RFC1700 address family numbers, same definition in print-bgp.c */
 218 /* FIXME: move all AF stuff into dedicated files */
 219 #define AFNUM_INET      1
 220 #define AFNUM_INET6     2
 221 #define AFNUM_LEN       2
 222
 223 #define FALSE 0
 224 #define TRUE  1
 225
 226 int ldp_msg_print(register const u_char *);
 227 int ldp_tlv_print(register const u_char *);
 228
 229 /*
 230  * ldp tlv header
 231  *
 232  *  0                   1                   2                   3
 233  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 234  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 235  * |U|F|        Type               |            Length             |
 236  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 237  * |                                                               |
 238  * |                             Value                             |
 239  * ~                                                               ~
 240  * |                                                               |
 241  * |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 242  * |                               |
 243  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 244  */
 245
 246 int
 247 ldp_tlv_print(register const u_char *tptr) {
 248
 249     struct ldp_tlv_header {
 250         u_int8_t type[2];
 251         u_int8_t length[2];
 252     };
 253
 254     const struct ldp_tlv_header *ldp_tlv_header;
 255     u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
 256     u_char fec_type;
 257     u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
 258     char buf[100];
 259     int i;
 260
 261     ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
 262     tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
 263     tlv_tlen=tlv_len;
 264     tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
 265
 266     /* FIXME vendor private / experimental check */
 267     printf("\n\t    %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
 268            tok2str(ldp_tlv_values,
 269                    "Unknown",
 270                    tlv_type),
 271            tlv_type,
 272            tlv_len,
 273            LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
 274            LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't");
 275
 276     tptr+=sizeof(struct ldp_tlv_header);
 277
 278     switch(tlv_type) {
 279
 280     case LDP_TLV_COMMON_HELLO:
 281         printf("\n\t      Hold Time: %us, Flags: [%s Hello%s]",
 282                EXTRACT_16BITS(tptr),
 283                (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
 284                (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : "");
 285         break;
 286
 287     case LDP_TLV_IPV4_TRANSPORT_ADDR:
 288         printf("\n\t      IPv4 Transport Address: %s", ipaddr_string(tptr));
 289         break;
 290 #ifdef INET6
 291     case LDP_TLV_IPV6_TRANSPORT_ADDR:
 292         printf("\n\t      IPv6 Transport Address: %s", ip6addr_string(tptr));
 293         break;
 294 #endif
 295     case LDP_TLV_CONFIG_SEQ_NUMBER:
 296         printf("\n\t      Sequence Number: %u", EXTRACT_32BITS(tptr));
 297         break;
 298
 299     case LDP_TLV_ADDRESS_LIST:
 300         af = EXTRACT_16BITS(tptr);
 301         tptr+=AFNUM_LEN;
 302         tlv_tlen -= AFNUM_LEN;
 303         printf("\n\t      Address Family: ");
 304         if (af == AFNUM_INET) {
 305             printf("IPv4, addresses:");
 306             while(tlv_tlen >= sizeof(struct in_addr)) {
 307                 printf(" %s",ipaddr_string(tptr));
 308                 tlv_tlen-=sizeof(struct in_addr);
 309                 tptr+=sizeof(struct in_addr);
 310             }
 311         }
 312 #ifdef INET6
 313         else if (af == AFNUM_INET6) {
 314             printf("IPv6, addresses:");
 315             while(tlv_tlen >= sizeof(struct in6_addr)) {
 316                 printf(" %s",ip6addr_string(tptr));
 317                 tlv_tlen-=sizeof(struct in6_addr);
 318                 tptr+=sizeof(struct in6_addr);
 319             }
 320         }
 321 #endif
 322         break;
 323
 324     case LDP_TLV_COMMON_SESSION:
 325         printf("\n\t      Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
 326                EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
 327                (EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
 328                (EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
 329                );
 330         break;
 331
 332     case LDP_TLV_FEC:
 333         fec_type = *tptr;
 334         printf("\n\t      %s FEC (0x%02x)",
 335                tok2str(ldp_fec_values, "Unknown", fec_type),
 336                fec_type);
 337
 338         tptr+=1;
 339         switch(fec_type) {
 340
 341         case LDP_FEC_WILDCARD:
 342             break;
 343         case LDP_FEC_PREFIX:
 344             af = EXTRACT_16BITS(tptr);
 345             tptr+=2;
 346             if (af == AFNUM_INET) {
 347                 i=decode_prefix4(tptr,buf,sizeof(buf));
 348                 printf(": IPv4 prefix %s",buf);
 349             }
 350 #ifdef INET6
 351             else if (af == AFNUM_INET6) {
 352                 i=decode_prefix6(tptr,buf,sizeof(buf));
 353                 printf(": IPv6 prefix %s",buf);
 354             }
 355 #endif
 356             break;
 357         case LDP_FEC_HOSTADDRESS:
 358             break;
 359         case LDP_FEC_MARTINI_VC:
 360             if (!TTEST2(*tptr, 11))
 361                 goto trunc;
 362             vc_info_len = *(tptr+2);
 363
 364             printf(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
 365                    tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
 366                    EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
 367                    EXTRACT_32BITS(tptr+3),
 368                    EXTRACT_32BITS(tptr+7),
 369                    vc_info_len);
 370
 371             if (vc_info_len == 0) /* infinite loop protection */
 372                 break;
 373
 374             tptr+=11;
 375             if (!TTEST2(*tptr, vc_info_len))
 376                 goto trunc;
 377
 378             while (vc_info_len > 2) {
 379                 vc_info_tlv_type = *tptr;
 380                 vc_info_tlv_len = *(tptr+1);
 381                 if (vc_info_tlv_len < 2)
 382                     break;
 383                 if (vc_info_len < vc_info_tlv_len)
 384                     break;
 385
 386                 printf("\n\t\tInterface Parameter: %s (0x%02x), len %u",
 387                        tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
 388                        vc_info_tlv_type,
 389                        vc_info_tlv_len);
 390
 391                 switch(vc_info_tlv_type) {
 392                 case LDP_FEC_MARTINI_IFPARM_MTU:
 393                     printf(": %u",EXTRACT_16BITS(tptr+2));
 394                     break;
 395
 396                 case LDP_FEC_MARTINI_IFPARM_DESC:
 397                     printf(": ");
 398                     for (idx = 2; idx < vc_info_tlv_len; idx++)
 399                         safeputchar(*(tptr+idx));
 400                     break;
 401
 402                 case LDP_FEC_MARTINI_IFPARM_VCCV:
 403                     printf("\n\t\t  Control Channels (0x%02x) = [%s]",
 404                            *(tptr+2),
 405                            bittok2str(ldp_fec_martini_ifparm_vccv_cc_values,"none",*(tptr+2)));
 406                     printf("\n\t\t  CV Types (0x%02x) = [%s]",
 407                            *(tptr+3),
 408                            bittok2str(ldp_fec_martini_ifparm_vccv_cv_values,"none",*(tptr+3)));
 409                     break;
 410
 411                 default:
 412                     print_unknown_data(tptr+2,"\n\t\t  ",vc_info_tlv_len-2);
 413                     break;
 414                 }
 415
 416                 vc_info_len -= vc_info_tlv_len;
 417                 tptr += vc_info_tlv_len;
 418             }
 419             break;
 420         }
 421
 422         break;
 423
 424     case LDP_TLV_GENERIC_LABEL:
 425         printf("\n\t      Label: %u", EXTRACT_32BITS(tptr) & 0xfffff);
 426         break;
 427
 428     case LDP_TLV_STATUS:
 429         ui = EXTRACT_32BITS(tptr);
 430         tptr+=4;
 431         printf("\n\t      Status: 0x%02x, Flags: [%s and %s forward]",
 432                ui&0x3fffffff,
 433                ui&0x80000000 ? "Fatal error" : "Advisory Notification",
 434                ui&0x40000000 ? "do" : "don't");
 435         ui = EXTRACT_32BITS(tptr);
 436         tptr+=4;
 437         if (ui)
 438             printf(", causing Message ID: 0x%08x", ui);
 439         break;
 440
 441     case LDP_TLV_FT_SESSION:
 442         ft_flags = EXTRACT_16BITS(tptr);
 443         printf("\n\t      Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
 444                ft_flags&0x8000 ? "" : "No ",
 445                ft_flags&0x8 ? "" : "Don't ",
 446                ft_flags&0x4 ? "" : "No ",
 447                ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
 448                ft_flags&0x1 ? "" : "Don't ");
 449         tptr+=4;
 450         ui = EXTRACT_32BITS(tptr);
 451         if (ui)
 452             printf(", Reconnect Timeout: %ums", ui);
 453         tptr+=4;
 454         ui = EXTRACT_32BITS(tptr);
 455         if (ui)
 456             printf(", Recovery Time: %ums", ui);
 457         break;
 458
 459
 460     /*
 461      *  FIXME those are the defined TLVs that lack a decoder
 462      *  you are welcome to contribute code ;-)
 463      */
 464
 465     case LDP_TLV_HOP_COUNT:
 466     case LDP_TLV_PATH_VECTOR:
 467     case LDP_TLV_ATM_LABEL:
 468     case LDP_TLV_FR_LABEL:
 469     case LDP_TLV_EXTD_STATUS:
 470     case LDP_TLV_RETURNED_PDU:
 471     case LDP_TLV_RETURNED_MSG:
 472     case LDP_TLV_ATM_SESSION_PARM:
 473     case LDP_TLV_FR_SESSION_PARM:
 474     case LDP_TLV_LABEL_REQUEST_MSG_ID:
 475
 476     default:
 477         if (vflag <= 1)
 478             print_unknown_data(tptr,"\n\t      ",tlv_tlen);
 479         break;
 480     }
 481     return(tlv_len+4); /* Type & Length fields not included */
 482
 483 trunc:
 484     printf("\n\t\t packet exceeded snapshot");
 485     return 0;
 486 }
 487
 488 void
 489 ldp_print(register const u_char *pptr, register u_int len) {
 490
 491     int processed;
 492     while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
 493         processed = ldp_msg_print(pptr);
 494         if (processed == 0)
 495             return;
 496         len -= processed;
 497         pptr += processed;
 498     }
 499 }
 500
 501
 502 int
 503 ldp_msg_print(register const u_char *pptr) {
 504
 505     const struct ldp_common_header *ldp_com_header;
 506     const struct ldp_msg_header *ldp_msg_header;
 507     const u_char *tptr,*msg_tptr;
 508     u_short tlen;
 509     u_short pdu_len,msg_len,msg_type,msg_tlen;
 510     int hexdump,processed;
 511
 512     tptr=pptr;
 513     ldp_com_header = (const struct ldp_common_header *)pptr;
 514     TCHECK(*ldp_com_header);
 515
 516     /*
 517      * Sanity checking of the header.
 518      */
 519     if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
 520         printf("%sLDP version %u packet not supported",
 521                (vflag < 1) ? "" : "\n\t",
 522                EXTRACT_16BITS(&ldp_com_header->version));
 523         return 0;
 524     }
 525
 526     /* print the LSR-ID, label-space & length */
 527     pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
 528     printf("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
 529            (vflag < 1) ? "" : "\n\t",
 530            ipaddr_string(&ldp_com_header->lsr_id),
 531            EXTRACT_16BITS(&ldp_com_header->label_space),
 532            pdu_len);
 533
 534     /* bail out if non-verbose */
 535     if (vflag < 1)
 536         return 0;
 537
 538     /* ok they seem to want to know everything - lets fully decode it */
 539     tlen=pdu_len;
 540
 541     tptr += sizeof(const struct ldp_common_header);
 542     tlen -= sizeof(const struct ldp_common_header)-4;   /* Type & Length fields not included */
 543
 544     while(tlen>0) {
 545         /* did we capture enough for fully decoding the msg header ? */
 546         if (!TTEST2(*tptr, sizeof(struct ldp_msg_header)))
 547             goto trunc;
 548
 549         ldp_msg_header = (const struct ldp_msg_header *)tptr;
 550         msg_len=EXTRACT_16BITS(ldp_msg_header->length);
 551         msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
 552
 553         /* FIXME vendor private / experimental check */
 554         printf("\n\t  %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
 555                tok2str(ldp_msg_values,
 556                        "Unknown",
 557                        msg_type),
 558                msg_type,
 559                msg_len,
 560                EXTRACT_32BITS(&ldp_msg_header->id),
 561                LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore");
 562
 563         if (msg_len == 0) /* infinite loop protection */
 564             return 0;
 565
 566         msg_tptr=tptr+sizeof(struct ldp_msg_header);
 567         msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
 568
 569         /* did we capture enough for fully decoding the message ? */
 570         if (!TTEST2(*tptr, msg_len))
 571             goto trunc;
 572         hexdump=FALSE;
 573
 574         switch(msg_type) {
 575
 576         case LDP_MSG_NOTIF:
 577         case LDP_MSG_HELLO:
 578         case LDP_MSG_INIT:
 579         case LDP_MSG_KEEPALIVE:
 580         case LDP_MSG_ADDRESS:
 581         case LDP_MSG_LABEL_MAPPING:
 582         case LDP_MSG_ADDRESS_WITHDRAW:
 583         case LDP_MSG_LABEL_WITHDRAW:
 584             while(msg_tlen >= 4) {
 585                 processed = ldp_tlv_print(msg_tptr);
 586                 if (processed == 0)
 587                     break;
 588                 msg_tlen-=processed;
 589                 msg_tptr+=processed;
 590             }
 591             break;
 592
 593         /*
 594          *  FIXME those are the defined messages that lack a decoder
 595          *  you are welcome to contribute code ;-)
 596          */
 597
 598         case LDP_MSG_LABEL_REQUEST:
 599         case LDP_MSG_LABEL_RELEASE:
 600         case LDP_MSG_LABEL_ABORT_REQUEST:
 601
 602         default:
 603             if (vflag <= 1)
 604                 print_unknown_data(msg_tptr,"\n\t  ",msg_tlen);
 605             break;
 606         }
 607         /* do we want to see an additionally hexdump ? */
 608         if (vflag > 1 || hexdump==TRUE)
 609             print_unknown_data(tptr+sizeof(sizeof(struct ldp_msg_header)),"\n\t  ",
 610                                msg_len);
 611
 612         tptr += msg_len+4;
 613         tlen -= msg_len+4;
 614     }
 615     return pdu_len+4;
 616 trunc:
 617     printf("\n\t\t packet exceeded snapshot");
 618     return 0;
 619 }
 620