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 1.19 2006-03-28 07:06:21 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 #include "af.h"
  39
  40 /*
  41  * ldp common header
  42  *
  43  *  0                   1                   2                   3
  44  *  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
  45  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  46  * |  Version                      |         PDU Length            |
  47  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  48  * |                         LDP Identifier                        |
  49  * +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  50  * |                               |
  51  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  52  *
  53  */
  54
  55 struct ldp_common_header {
  56     u_int8_t version[2];
  57     u_int8_t pdu_length[2];
  58     u_int8_t lsr_id[4];
  59     u_int8_t label_space[2];
  60 };
  61
  62 #define LDP_VERSION 1
  63
  64 /*
  65  * ldp message header
  66  *
  67  *  0                   1                   2                   3
  68  *  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
  69  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  70  * |U|   Message Type              |      Message Length           |
  71  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  72  * |                     Message ID                                |
  73  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  74  * |                                                               |
  75  * +                                                               +
  76  * |                     Mandatory Parameters                      |
  77  * +                                                               +
  78  * |                                                               |
  79  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  80  * |                                                               |
  81  * +                                                               +
  82  * |                     Optional Parameters                       |
  83  * +                                                               +
  84  * |                                                               |
  85  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  86  */
  87
  88 struct ldp_msg_header {
  89     u_int8_t type[2];
  90     u_int8_t length[2];
  91     u_int8_t id[4];
  92 };
  93
  94 #define LDP_MASK_MSG_TYPE(x)  ((x)&0x7fff)
  95 #define LDP_MASK_U_BIT(x)     ((x)&0x8000)
  96
  97 #define LDP_MSG_NOTIF                0x0001
  98 #define LDP_MSG_HELLO                0x0100
  99 #define LDP_MSG_INIT                 0x0200
 100 #define LDP_MSG_KEEPALIVE            0x0201
 101 #define LDP_MSG_ADDRESS              0x0300
 102 #define LDP_MSG_ADDRESS_WITHDRAW     0x0301
 103 #define LDP_MSG_LABEL_MAPPING        0x0400
 104 #define LDP_MSG_LABEL_REQUEST        0x0401
 105 #define LDP_MSG_LABEL_WITHDRAW       0x0402
 106 #define LDP_MSG_LABEL_RELEASE        0x0403
 107 #define LDP_MSG_LABEL_ABORT_REQUEST  0x0404
 108
 109 #define LDP_VENDOR_PRIVATE_MIN       0x3e00
 110 #define LDP_VENDOR_PRIVATE_MAX       0x3eff
 111 #define LDP_EXPERIMENTAL_MIN         0x3f00
 112 #define LDP_EXPERIMENTAL_MAX         0x3fff
 113
 114 static const struct tok ldp_msg_values[] = {
 115     { LDP_MSG_NOTIF,                 "Notification" },
 116     { LDP_MSG_HELLO,                 "Hello" },
 117     { LDP_MSG_INIT,                  "Initialization" },
 118     { LDP_MSG_KEEPALIVE,             "Keepalive" },
 119     { LDP_MSG_ADDRESS,               "Address" },
 120     { LDP_MSG_ADDRESS_WITHDRAW,      "Address Withdraw" },
 121     { LDP_MSG_LABEL_MAPPING,         "Label Mapping" },
 122     { LDP_MSG_LABEL_REQUEST,         "Label Request" },
 123     { LDP_MSG_LABEL_WITHDRAW,        "Label Withdraw" },
 124     { LDP_MSG_LABEL_RELEASE,         "Label Release" },
 125     { LDP_MSG_LABEL_ABORT_REQUEST,   "Label Abort Request" },
 126     { 0, NULL}
 127 };
 128
 129 #define LDP_MASK_TLV_TYPE(x)  ((x)&0x3fff)
 130 #define LDP_MASK_F_BIT(x) ((x)&0x4000)
 131
 132 #define LDP_TLV_FEC                  0x0100
 133 #define LDP_TLV_ADDRESS_LIST         0x0101
 134 #define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2
 135 #define LDP_TLV_HOP_COUNT            0x0103
 136 #define LDP_TLV_PATH_VECTOR          0x0104
 137 #define LDP_TLV_GENERIC_LABEL        0x0200
 138 #define LDP_TLV_ATM_LABEL            0x0201
 139 #define LDP_TLV_FR_LABEL             0x0202
 140 #define LDP_TLV_STATUS               0x0300
 141 #define LDP_TLV_EXTD_STATUS          0x0301
 142 #define LDP_TLV_RETURNED_PDU         0x0302
 143 #define LDP_TLV_RETURNED_MSG         0x0303
 144 #define LDP_TLV_COMMON_HELLO         0x0400
 145 #define LDP_TLV_IPV4_TRANSPORT_ADDR  0x0401
 146 #define LDP_TLV_CONFIG_SEQ_NUMBER    0x0402
 147 #define LDP_TLV_IPV6_TRANSPORT_ADDR  0x0403
 148 #define LDP_TLV_COMMON_SESSION       0x0500
 149 #define LDP_TLV_ATM_SESSION_PARM     0x0501
 150 #define LDP_TLV_FR_SESSION_PARM      0x0502
 151 #define LDP_TLV_FT_SESSION           0x0503
 152 #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
 153 #define LDP_TLV_MTU                  0x0601 /* rfc 3988 */
 154
 155 static const struct tok ldp_tlv_values[] = {
 156     { LDP_TLV_FEC,                   "FEC" },
 157     { LDP_TLV_ADDRESS_LIST,          "Address List" },
 158     { LDP_TLV_HOP_COUNT,             "Hop Count" },
 159     { LDP_TLV_PATH_VECTOR,           "Path Vector" },
 160     { LDP_TLV_GENERIC_LABEL,         "Generic Label" },
 161     { LDP_TLV_ATM_LABEL,             "ATM Label" },
 162     { LDP_TLV_FR_LABEL,              "Frame-Relay Label" },
 163     { LDP_TLV_STATUS,                "Status" },
 164     { LDP_TLV_EXTD_STATUS,           "Extended Status" },
 165     { LDP_TLV_RETURNED_PDU,          "Returned PDU" },
 166     { LDP_TLV_RETURNED_MSG,          "Returned Message" },
 167     { LDP_TLV_COMMON_HELLO,          "Common Hello Parameters" },
 168     { LDP_TLV_IPV4_TRANSPORT_ADDR,   "IPv4 Transport Address" },
 169     { LDP_TLV_CONFIG_SEQ_NUMBER,     "Configuration Sequence Number" },
 170     { LDP_TLV_IPV6_TRANSPORT_ADDR,   "IPv6 Transport Address" },
 171     { LDP_TLV_COMMON_SESSION,        "Common Session Parameters" },
 172     { LDP_TLV_ATM_SESSION_PARM,      "ATM Session Parameters" },
 173     { LDP_TLV_FR_SESSION_PARM,       "Frame-Relay Session Parameters" },
 174     { LDP_TLV_FT_SESSION,            "Fault-Tolerant Session Parameters" },
 175     { LDP_TLV_LABEL_REQUEST_MSG_ID,  "Label Request Message ID" },
 176     { LDP_TLV_MTU,                   "MTU" },
 177     { 0, NULL}
 178 };
 179
 180 #define LDP_FEC_WILDCARD        0x01
 181 #define LDP_FEC_PREFIX          0x02
 182 #define LDP_FEC_HOSTADDRESS     0x03
 183 /* From draft-martini-l2circuit-trans-mpls-13.txt */
 184 #define LDP_FEC_MARTINI_VC      0x80
 185
 186 static const struct tok ldp_fec_values[] = {
 187     { LDP_FEC_WILDCARD,         "Wildcard" },
 188     { LDP_FEC_PREFIX,           "Prefix" },
 189     { LDP_FEC_HOSTADDRESS,      "Host address" },
 190     { LDP_FEC_MARTINI_VC,       "Martini VC" },
 191     { 0, NULL}
 192 };
 193
 194 #define LDP_FEC_MARTINI_IFPARM_MTU  0x01
 195 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
 196 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
 197
 198 static const struct tok ldp_fec_martini_ifparm_values[] = {
 199     { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
 200     { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
 201     { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
 202     { 0, NULL}
 203 };
 204
 205 /* draft-ietf-pwe3-vccv-04.txt */
 206 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
 207     { 0x01, "PWE3 control word" },
 208     { 0x02, "MPLS Router Alert Label" },
 209     { 0x04, "MPLS inner label TTL = 1" },
 210     { 0, NULL}
 211 };
 212
 213 /* draft-ietf-pwe3-vccv-04.txt */
 214 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
 215     { 0x01, "ICMP Ping" },
 216     { 0x02, "LSP Ping" },
 217     { 0x04, "BFD" },
 218     { 0, NULL}
 219 };
 220
 221 #define FALSE 0
 222 #define TRUE  1
 223
 224 int ldp_msg_print(register const u_char *);
 225 int ldp_tlv_print(register const u_char *);
 226
 227 /*
 228  * ldp tlv header
 229  *
 230  *  0                   1                   2                   3
 231  *  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
 232  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 233  * |U|F|        Type               |            Length             |
 234  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 235  * |                                                               |
 236  * |                             Value                             |
 237  * ~                                                               ~
 238  * |                                                               |
 239  * |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 240  * |                               |
 241  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 242  */
 243
 244 int
 245 ldp_tlv_print(register const u_char *tptr) {
 246
 247     struct ldp_tlv_header {
 248         u_int8_t type[2];
 249         u_int8_t length[2];
 250     };
 251
 252     const struct ldp_tlv_header *ldp_tlv_header;
 253     u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
 254     u_char fec_type;
 255     u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
 256     char buf[100];
 257     int i;
 258
 259     ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
 260     tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
 261     tlv_tlen=tlv_len;
 262     tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
 263
 264     /* FIXME vendor private / experimental check */
 265     printf("\n\t    %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
 266            tok2str(ldp_tlv_values,
 267                    "Unknown",
 268                    tlv_type),
 269            tlv_type,
 270            tlv_len,
 271            LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
 272            LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't");
 273
 274     tptr+=sizeof(struct ldp_tlv_header);
 275
 276     switch(tlv_type) {
 277
 278     case LDP_TLV_COMMON_HELLO:
 279         printf("\n\t      Hold Time: %us, Flags: [%s Hello%s]",
 280                EXTRACT_16BITS(tptr),
 281                (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
 282                (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : "");
 283         break;
 284
 285     case LDP_TLV_IPV4_TRANSPORT_ADDR:
 286         printf("\n\t      IPv4 Transport Address: %s", ipaddr_string(tptr));
 287         break;
 288 #ifdef INET6
 289     case LDP_TLV_IPV6_TRANSPORT_ADDR:
 290         printf("\n\t      IPv6 Transport Address: %s", ip6addr_string(tptr));
 291         break;
 292 #endif
 293     case LDP_TLV_CONFIG_SEQ_NUMBER:
 294         printf("\n\t      Sequence Number: %u", EXTRACT_32BITS(tptr));
 295         break;
 296
 297     case LDP_TLV_ADDRESS_LIST:
 298         af = EXTRACT_16BITS(tptr);
 299         tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 300         tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 301         printf("\n\t      Address Family: %s, addresses",
 302                tok2str(af_values, "Unknown (%u)", af));
 303         switch (af) {
 304         case AFNUM_INET:
 305             while(tlv_tlen >= sizeof(struct in_addr)) {
 306                 printf(" %s",ipaddr_string(tptr));
 307                 tlv_tlen-=sizeof(struct in_addr);
 308                 tptr+=sizeof(struct in_addr);
 309             }
 310             break;
 311 #ifdef INET6
 312         case AFNUM_INET6:
 313             while(tlv_tlen >= sizeof(struct in6_addr)) {
 314                 printf(" %s",ip6addr_string(tptr));
 315                 tlv_tlen-=sizeof(struct in6_addr);
 316                 tptr+=sizeof(struct in6_addr);
 317             }
 318             break;
 319 #endif
 320         default:
 321             /* unknown AF */
 322             break;
 323         }
 324         break;
 325
 326     case LDP_TLV_COMMON_SESSION:
 327         printf("\n\t      Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
 328                EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
 329                (EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
 330                (EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
 331                );
 332         break;
 333
 334     case LDP_TLV_FEC:
 335         fec_type = *tptr;
 336         printf("\n\t      %s FEC (0x%02x)",
 337                tok2str(ldp_fec_values, "Unknown", fec_type),
 338                fec_type);
 339
 340         tptr+=1;
 341         switch(fec_type) {
 342
 343         case LDP_FEC_WILDCARD:
 344             break;
 345         case LDP_FEC_PREFIX:
 346             af = EXTRACT_16BITS(tptr);
 347             tptr+=2;
 348             if (af == AFNUM_INET) {
 349                 i=decode_prefix4(tptr,buf,sizeof(buf));
 350                 printf(": IPv4 prefix %s",buf);
 351             }
 352 #ifdef INET6
 353             else if (af == AFNUM_INET6) {
 354                 i=decode_prefix6(tptr,buf,sizeof(buf));
 355                 printf(": IPv6 prefix %s",buf);
 356             }
 357 #endif
 358             break;
 359         case LDP_FEC_HOSTADDRESS:
 360             break;
 361         case LDP_FEC_MARTINI_VC:
 362             if (!TTEST2(*tptr, 11))
 363                 goto trunc;
 364             vc_info_len = *(tptr+2);
 365
 366             printf(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
 367                    tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
 368                    EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
 369                    EXTRACT_32BITS(tptr+3),
 370                    EXTRACT_32BITS(tptr+7),
 371                    vc_info_len);
 372
 373             if (vc_info_len == 0) /* infinite loop protection */
 374                 break;
 375
 376             tptr+=11;
 377             if (!TTEST2(*tptr, vc_info_len))
 378                 goto trunc;
 379
 380             while (vc_info_len > 2) {
 381                 vc_info_tlv_type = *tptr;
 382                 vc_info_tlv_len = *(tptr+1);
 383                 if (vc_info_tlv_len < 2)
 384                     break;
 385                 if (vc_info_len < vc_info_tlv_len)
 386                     break;
 387
 388                 printf("\n\t\tInterface Parameter: %s (0x%02x), len %u",
 389                        tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
 390                        vc_info_tlv_type,
 391                        vc_info_tlv_len);
 392
 393                 switch(vc_info_tlv_type) {
 394                 case LDP_FEC_MARTINI_IFPARM_MTU:
 395                     printf(": %u",EXTRACT_16BITS(tptr+2));
 396                     break;
 397
 398                 case LDP_FEC_MARTINI_IFPARM_DESC:
 399                     printf(": ");
 400                     for (idx = 2; idx < vc_info_tlv_len; idx++)
 401                         safeputchar(*(tptr+idx));
 402                     break;
 403
 404                 case LDP_FEC_MARTINI_IFPARM_VCCV:
 405                     printf("\n\t\t  Control Channels (0x%02x) = [%s]",
 406                            *(tptr+2),
 407                            bittok2str(ldp_fec_martini_ifparm_vccv_cc_values,"none",*(tptr+2)));
 408                     printf("\n\t\t  CV Types (0x%02x) = [%s]",
 409                            *(tptr+3),
 410                            bittok2str(ldp_fec_martini_ifparm_vccv_cv_values,"none",*(tptr+3)));
 411                     break;
 412
 413                 default:
 414                     print_unknown_data(tptr+2,"\n\t\t  ",vc_info_tlv_len-2);
 415                     break;
 416                 }
 417
 418                 vc_info_len -= vc_info_tlv_len;
 419                 tptr += vc_info_tlv_len;
 420             }
 421             break;
 422         }
 423
 424         break;
 425
 426     case LDP_TLV_GENERIC_LABEL:
 427         printf("\n\t      Label: %u", EXTRACT_32BITS(tptr) & 0xfffff);
 428         break;
 429
 430     case LDP_TLV_STATUS:
 431         ui = EXTRACT_32BITS(tptr);
 432         tptr+=4;
 433         printf("\n\t      Status: 0x%02x, Flags: [%s and %s forward]",
 434                ui&0x3fffffff,
 435                ui&0x80000000 ? "Fatal error" : "Advisory Notification",
 436                ui&0x40000000 ? "do" : "don't");
 437         ui = EXTRACT_32BITS(tptr);
 438         tptr+=4;
 439         if (ui)
 440             printf(", causing Message ID: 0x%08x", ui);
 441         break;
 442
 443     case LDP_TLV_FT_SESSION:
 444         ft_flags = EXTRACT_16BITS(tptr);
 445         printf("\n\t      Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
 446                ft_flags&0x8000 ? "" : "No ",
 447                ft_flags&0x8 ? "" : "Don't ",
 448                ft_flags&0x4 ? "" : "No ",
 449                ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
 450                ft_flags&0x1 ? "" : "Don't ");
 451         tptr+=4;
 452         ui = EXTRACT_32BITS(tptr);
 453         if (ui)
 454             printf(", Reconnect Timeout: %ums", ui);
 455         tptr+=4;
 456         ui = EXTRACT_32BITS(tptr);
 457         if (ui)
 458             printf(", Recovery Time: %ums", ui);
 459         break;
 460
 461     case LDP_TLV_MTU:
 462         printf("\n\t      MTU: %u", EXTRACT_16BITS(tptr));
 463         break;
 464
 465
 466     /*
 467      *  FIXME those are the defined TLVs that lack a decoder
 468      *  you are welcome to contribute code ;-)
 469      */
 470
 471     case LDP_TLV_HOP_COUNT:
 472     case LDP_TLV_PATH_VECTOR:
 473     case LDP_TLV_ATM_LABEL:
 474     case LDP_TLV_FR_LABEL:
 475     case LDP_TLV_EXTD_STATUS:
 476     case LDP_TLV_RETURNED_PDU:
 477     case LDP_TLV_RETURNED_MSG:
 478     case LDP_TLV_ATM_SESSION_PARM:
 479     case LDP_TLV_FR_SESSION_PARM:
 480     case LDP_TLV_LABEL_REQUEST_MSG_ID:
 481
 482     default:
 483         if (vflag <= 1)
 484             print_unknown_data(tptr,"\n\t      ",tlv_tlen);
 485         break;
 486     }
 487     return(tlv_len+4); /* Type & Length fields not included */
 488
 489 trunc:
 490     printf("\n\t\t packet exceeded snapshot");
 491     return 0;
 492 }
 493
 494 void
 495 ldp_print(register const u_char *pptr, register u_int len) {
 496
 497     int processed;
 498     while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
 499         processed = ldp_msg_print(pptr);
 500         if (processed == 0)
 501             return;
 502         len -= processed;
 503         pptr += processed;
 504     }
 505 }
 506
 507
 508 int
 509 ldp_msg_print(register const u_char *pptr) {
 510
 511     const struct ldp_common_header *ldp_com_header;
 512     const struct ldp_msg_header *ldp_msg_header;
 513     const u_char *tptr,*msg_tptr;
 514     u_short tlen;
 515     u_short pdu_len,msg_len,msg_type,msg_tlen;
 516     int hexdump,processed;
 517
 518     tptr=pptr;
 519     ldp_com_header = (const struct ldp_common_header *)pptr;
 520     TCHECK(*ldp_com_header);
 521
 522     /*
 523      * Sanity checking of the header.
 524      */
 525     if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
 526         printf("%sLDP version %u packet not supported",
 527                (vflag < 1) ? "" : "\n\t",
 528                EXTRACT_16BITS(&ldp_com_header->version));
 529         return 0;
 530     }
 531
 532     /* print the LSR-ID, label-space & length */
 533     pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
 534     printf("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
 535            (vflag < 1) ? "" : "\n\t",
 536            ipaddr_string(&ldp_com_header->lsr_id),
 537            EXTRACT_16BITS(&ldp_com_header->label_space),
 538            pdu_len);
 539
 540     /* bail out if non-verbose */
 541     if (vflag < 1)
 542         return 0;
 543
 544     /* ok they seem to want to know everything - lets fully decode it */
 545     tlen=pdu_len;
 546
 547     tptr += sizeof(const struct ldp_common_header);
 548     tlen -= sizeof(const struct ldp_common_header)-4;   /* Type & Length fields not included */
 549
 550     while(tlen>0) {
 551         /* did we capture enough for fully decoding the msg header ? */
 552         if (!TTEST2(*tptr, sizeof(struct ldp_msg_header)))
 553             goto trunc;
 554
 555         ldp_msg_header = (const struct ldp_msg_header *)tptr;
 556         msg_len=EXTRACT_16BITS(ldp_msg_header->length);
 557         msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
 558
 559         /* FIXME vendor private / experimental check */
 560         printf("\n\t  %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
 561                tok2str(ldp_msg_values,
 562                        "Unknown",
 563                        msg_type),
 564                msg_type,
 565                msg_len,
 566                EXTRACT_32BITS(&ldp_msg_header->id),
 567                LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore");
 568
 569         if (msg_len == 0) /* infinite loop protection */
 570             return 0;
 571
 572         msg_tptr=tptr+sizeof(struct ldp_msg_header);
 573         msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
 574
 575         /* did we capture enough for fully decoding the message ? */
 576         if (!TTEST2(*tptr, msg_len))
 577             goto trunc;
 578         hexdump=FALSE;
 579
 580         switch(msg_type) {
 581
 582         case LDP_MSG_NOTIF:
 583         case LDP_MSG_HELLO:
 584         case LDP_MSG_INIT:
 585         case LDP_MSG_KEEPALIVE:
 586         case LDP_MSG_ADDRESS:
 587         case LDP_MSG_LABEL_MAPPING:
 588         case LDP_MSG_ADDRESS_WITHDRAW:
 589         case LDP_MSG_LABEL_WITHDRAW:
 590             while(msg_tlen >= 4) {
 591                 processed = ldp_tlv_print(msg_tptr);
 592                 if (processed == 0)
 593                     break;
 594                 msg_tlen-=processed;
 595                 msg_tptr+=processed;
 596             }
 597             break;
 598
 599         /*
 600          *  FIXME those are the defined messages that lack a decoder
 601          *  you are welcome to contribute code ;-)
 602          */
 603
 604         case LDP_MSG_LABEL_REQUEST:
 605         case LDP_MSG_LABEL_RELEASE:
 606         case LDP_MSG_LABEL_ABORT_REQUEST:
 607
 608         default:
 609             if (vflag <= 1)
 610                 print_unknown_data(msg_tptr,"\n\t  ",msg_tlen);
 611             break;
 612         }
 613         /* do we want to see an additionally hexdump ? */
 614         if (vflag > 1 || hexdump==TRUE)
 615             print_unknown_data(tptr+sizeof(sizeof(struct ldp_msg_header)),"\n\t  ",
 616                                msg_len);
 617
 618         tptr += msg_len+4;
 619         tlen -= msg_len+4;
 620     }
 621     return pdu_len+4;
 622 trunc:
 623     printf("\n\t\t packet exceeded snapshot");
 624     return 0;
 625 }
 626