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 1.20 2006-06-23 02:03:09 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 RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
 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 int ldp_msg_print(register const u_char *);
 222 int ldp_tlv_print(register const u_char *);
 223
 224 /*
 225  * ldp tlv header
 226  *
 227  *  0                   1                   2                   3
 228  *  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
 229  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 230  * |U|F|        Type               |            Length             |
 231  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 232  * |                                                               |
 233  * |                             Value                             |
 234  * ~                                                               ~
 235  * |                                                               |
 236  * |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 237  * |                               |
 238  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 239  */
 240
 241 #define TLV_TCHECK(minlen) \
 242     TCHECK2(*tptr, minlen); if (tlv_tlen < minlen) goto badtlv;
 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         TLV_TCHECK(4);
 280         printf("\n\t      Hold Time: %us, Flags: [%s Hello%s]",
 281                EXTRACT_16BITS(tptr),
 282                (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
 283                (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : "");
 284         break;
 285
 286     case LDP_TLV_IPV4_TRANSPORT_ADDR:
 287         TLV_TCHECK(4);
 288         printf("\n\t      IPv4 Transport Address: %s", ipaddr_string(tptr));
 289         break;
 290 #ifdef INET6
 291     case LDP_TLV_IPV6_TRANSPORT_ADDR:
 292         TLV_TCHECK(16);
 293         printf("\n\t      IPv6 Transport Address: %s", ip6addr_string(tptr));
 294         break;
 295 #endif
 296     case LDP_TLV_CONFIG_SEQ_NUMBER:
 297         TLV_TCHECK(4);
 298         printf("\n\t      Sequence Number: %u", EXTRACT_32BITS(tptr));
 299         break;
 300
 301     case LDP_TLV_ADDRESS_LIST:
 302         TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
 303         af = EXTRACT_16BITS(tptr);
 304         tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 305         tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 306         printf("\n\t      Address Family: %s, addresses",
 307                tok2str(af_values, "Unknown (%u)", af));
 308         switch (af) {
 309         case AFNUM_INET:
 310             while(tlv_tlen >= sizeof(struct in_addr)) {
 311                 TCHECK2(*tptr, sizeof(struct in_addr));
 312                 printf(" %s",ipaddr_string(tptr));
 313                 tlv_tlen-=sizeof(struct in_addr);
 314                 tptr+=sizeof(struct in_addr);
 315             }
 316             break;
 317 #ifdef INET6
 318         case AFNUM_INET6:
 319             while(tlv_tlen >= sizeof(struct in6_addr)) {
 320                 TCHECK2(*tptr, sizeof(struct in6_addr));
 321                 printf(" %s",ip6addr_string(tptr));
 322                 tlv_tlen-=sizeof(struct in6_addr);
 323                 tptr+=sizeof(struct in6_addr);
 324             }
 325             break;
 326 #endif
 327         default:
 328             /* unknown AF */
 329             break;
 330         }
 331         break;
 332
 333     case LDP_TLV_COMMON_SESSION:
 334         TLV_TCHECK(8);
 335         printf("\n\t      Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
 336                EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
 337                (EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
 338                (EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
 339                );
 340         break;
 341
 342     case LDP_TLV_FEC:
 343         TLV_TCHECK(1);
 344         fec_type = *tptr;
 345         printf("\n\t      %s FEC (0x%02x)",
 346                tok2str(ldp_fec_values, "Unknown", fec_type),
 347                fec_type);
 348
 349         tptr+=1;
 350         tlv_tlen-=1;
 351         switch(fec_type) {
 352
 353         case LDP_FEC_WILDCARD:
 354             break;
 355         case LDP_FEC_PREFIX:
 356             TLV_TCHECK(2);
 357             af = EXTRACT_16BITS(tptr);
 358             tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 359             tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 360             if (af == AFNUM_INET) {
 361                 i=decode_prefix4(tptr,tlv_tlen,buf,sizeof(buf));
 362                 if (i == -2)
 363                     goto trunc;
 364                 if (i == -3)
 365                     printf(": IPv4 prefix (goes past end of TLV)");
 366                 else if (i == -1)
 367                     printf(": IPv4 prefix (invalid length)");
 368                 else
 369                     printf(": IPv4 prefix %s",buf);
 370             }
 371 #ifdef INET6
 372             else if (af == AFNUM_INET6) {
 373                 i=decode_prefix6(tptr,tlv_tlen,buf,sizeof(buf));
 374                 if (i == -2)
 375                     goto trunc;
 376                 if (i == -3)
 377                     printf(": IPv4 prefix (goes past end of TLV)");
 378                 else if (i == -1)
 379                     printf(": IPv6 prefix (invalid length)");
 380                 else
 381                     printf(": IPv6 prefix %s",buf);
 382             }
 383 #endif
 384             else
 385                 printf(": Address family %u prefix", af);
 386             break;
 387         case LDP_FEC_HOSTADDRESS:
 388             break;
 389         case LDP_FEC_MARTINI_VC:
 390             /*
 391              * According to RFC 4908, the VC info Length field can be zero,
 392              * in which case not only are there no interface parameters,
 393              * there's no VC ID.
 394              */
 395             TLV_TCHECK(7);
 396             vc_info_len = *(tptr+2);
 397
 398             if (vc_info_len == 0) {
 399                 printf(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
 400                        tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
 401                        EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
 402                        EXTRACT_32BITS(tptr+3),
 403                        vc_info_len);
 404                 break;
 405             }
 406
 407             /* Make sure we have the VC ID as well */
 408             TLV_TCHECK(11);
 409             printf(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
 410                    tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
 411                    EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
 412                    EXTRACT_32BITS(tptr+3),
 413                    EXTRACT_32BITS(tptr+7),
 414                    vc_info_len);
 415             if (vc_info_len < 4)
 416                 goto trunc; /* minimum 4, for the VC ID */
 417             vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
 418
 419             /* Skip past the fixed information and the VC ID */
 420             tptr+=11;
 421             tlv_tlen-=11;
 422             TLV_TCHECK(vc_info_len);
 423
 424             while (vc_info_len > 2) {
 425                 vc_info_tlv_type = *tptr;
 426                 vc_info_tlv_len = *(tptr+1);
 427                 if (vc_info_tlv_len < 2)
 428                     break;
 429                 if (vc_info_len < vc_info_tlv_len)
 430                     break;
 431
 432                 printf("\n\t\tInterface Parameter: %s (0x%02x), len %u",
 433                        tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
 434                        vc_info_tlv_type,
 435                        vc_info_tlv_len);
 436
 437                 switch(vc_info_tlv_type) {
 438                 case LDP_FEC_MARTINI_IFPARM_MTU:
 439                     printf(": %u",EXTRACT_16BITS(tptr+2));
 440                     break;
 441
 442                 case LDP_FEC_MARTINI_IFPARM_DESC:
 443                     printf(": ");
 444                     for (idx = 2; idx < vc_info_tlv_len; idx++)
 445                         safeputchar(*(tptr+idx));
 446                     break;
 447
 448                 case LDP_FEC_MARTINI_IFPARM_VCCV:
 449                     printf("\n\t\t  Control Channels (0x%02x) = [%s]",
 450                            *(tptr+2),
 451                            bittok2str(ldp_fec_martini_ifparm_vccv_cc_values,"none",*(tptr+2)));
 452                     printf("\n\t\t  CV Types (0x%02x) = [%s]",
 453                            *(tptr+3),
 454                            bittok2str(ldp_fec_martini_ifparm_vccv_cv_values,"none",*(tptr+3)));
 455                     break;
 456
 457                 default:
 458                     print_unknown_data(gndo,tptr+2,"\n\t\t  ",vc_info_tlv_len-2);
 459                     break;
 460                 }
 461
 462                 vc_info_len -= vc_info_tlv_len;
 463                 tptr += vc_info_tlv_len;
 464             }
 465             break;
 466         }
 467
 468         break;
 469
 470     case LDP_TLV_GENERIC_LABEL:
 471         TLV_TCHECK(4);
 472         printf("\n\t      Label: %u", EXTRACT_32BITS(tptr) & 0xfffff);
 473         break;
 474
 475     case LDP_TLV_STATUS:
 476         TLV_TCHECK(8);
 477         ui = EXTRACT_32BITS(tptr);
 478         tptr+=4;
 479         printf("\n\t      Status: 0x%02x, Flags: [%s and %s forward]",
 480                ui&0x3fffffff,
 481                ui&0x80000000 ? "Fatal error" : "Advisory Notification",
 482                ui&0x40000000 ? "do" : "don't");
 483         ui = EXTRACT_32BITS(tptr);
 484         tptr+=4;
 485         if (ui)
 486             printf(", causing Message ID: 0x%08x", ui);
 487         break;
 488
 489     case LDP_TLV_FT_SESSION:
 490         TLV_TCHECK(8);
 491         ft_flags = EXTRACT_16BITS(tptr);
 492         printf("\n\t      Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
 493                ft_flags&0x8000 ? "" : "No ",
 494                ft_flags&0x8 ? "" : "Don't ",
 495                ft_flags&0x4 ? "" : "No ",
 496                ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
 497                ft_flags&0x1 ? "" : "Don't ");
 498         tptr+=4;
 499         ui = EXTRACT_32BITS(tptr);
 500         if (ui)
 501             printf(", Reconnect Timeout: %ums", ui);
 502         tptr+=4;
 503         ui = EXTRACT_32BITS(tptr);
 504         if (ui)
 505             printf(", Recovery Time: %ums", ui);
 506         break;
 507
 508     case LDP_TLV_MTU:
 509         TLV_TCHECK(2);
 510         printf("\n\t      MTU: %u", EXTRACT_16BITS(tptr));
 511         break;
 512
 513
 514     /*
 515      *  FIXME those are the defined TLVs that lack a decoder
 516      *  you are welcome to contribute code ;-)
 517      */
 518
 519     case LDP_TLV_HOP_COUNT:
 520     case LDP_TLV_PATH_VECTOR:
 521     case LDP_TLV_ATM_LABEL:
 522     case LDP_TLV_FR_LABEL:
 523     case LDP_TLV_EXTD_STATUS:
 524     case LDP_TLV_RETURNED_PDU:
 525     case LDP_TLV_RETURNED_MSG:
 526     case LDP_TLV_ATM_SESSION_PARM:
 527     case LDP_TLV_FR_SESSION_PARM:
 528     case LDP_TLV_LABEL_REQUEST_MSG_ID:
 529
 530     default:
 531         if (vflag <= 1)
 532             print_unknown_data(gndo,tptr,"\n\t      ",tlv_tlen);
 533         break;
 534     }
 535     return(tlv_len+4); /* Type & Length fields not included */
 536
 537 trunc:
 538     printf("\n\t\t packet exceeded snapshot");
 539     return 0;
 540
 541 badtlv:
 542     printf("\n\t\t TLV contents go past end of TLV");
 543     return(tlv_len+4); /* Type & Length fields not included */
 544 }
 545
 546 void
 547 ldp_print(register const u_char *pptr, register u_int len) {
 548
 549     int processed;
 550     while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
 551         processed = ldp_msg_print(pptr);
 552         if (processed == 0)
 553             return;
 554         len -= processed;
 555         pptr += processed;
 556     }
 557 }
 558
 559
 560 int
 561 ldp_msg_print(register const u_char *pptr) {
 562
 563     const struct ldp_common_header *ldp_com_header;
 564     const struct ldp_msg_header *ldp_msg_header;
 565     const u_char *tptr,*msg_tptr;
 566     u_short tlen;
 567     u_short pdu_len,msg_len,msg_type,msg_tlen;
 568     int hexdump,processed;
 569
 570     tptr=pptr;
 571     ldp_com_header = (const struct ldp_common_header *)pptr;
 572     TCHECK(*ldp_com_header);
 573
 574     /*
 575      * Sanity checking of the header.
 576      */
 577     if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
 578         printf("%sLDP version %u packet not supported",
 579                (vflag < 1) ? "" : "\n\t",
 580                EXTRACT_16BITS(&ldp_com_header->version));
 581         return 0;
 582     }
 583
 584     /* print the LSR-ID, label-space & length */
 585     pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
 586     printf("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
 587            (vflag < 1) ? "" : "\n\t",
 588            ipaddr_string(&ldp_com_header->lsr_id),
 589            EXTRACT_16BITS(&ldp_com_header->label_space),
 590            pdu_len);
 591
 592     /* bail out if non-verbose */
 593     if (vflag < 1)
 594         return 0;
 595
 596     /* ok they seem to want to know everything - lets fully decode it */
 597     tlen=pdu_len;
 598
 599     tptr += sizeof(const struct ldp_common_header);
 600     tlen -= sizeof(const struct ldp_common_header)-4;   /* Type & Length fields not included */
 601
 602     while(tlen>0) {
 603         /* did we capture enough for fully decoding the msg header ? */
 604         TCHECK2(*tptr, sizeof(struct ldp_msg_header));
 605
 606         ldp_msg_header = (const struct ldp_msg_header *)tptr;
 607         msg_len=EXTRACT_16BITS(ldp_msg_header->length);
 608         msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
 609
 610         /* FIXME vendor private / experimental check */
 611         printf("\n\t  %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
 612                tok2str(ldp_msg_values,
 613                        "Unknown",
 614                        msg_type),
 615                msg_type,
 616                msg_len,
 617                EXTRACT_32BITS(&ldp_msg_header->id),
 618                LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore");
 619
 620         if (msg_len == 0) /* infinite loop protection */
 621             return 0;
 622
 623         msg_tptr=tptr+sizeof(struct ldp_msg_header);
 624         msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
 625
 626         /* did we capture enough for fully decoding the message ? */
 627         TCHECK2(*tptr, msg_len);
 628         hexdump=FALSE;
 629
 630         switch(msg_type) {
 631
 632         case LDP_MSG_NOTIF:
 633         case LDP_MSG_HELLO:
 634         case LDP_MSG_INIT:
 635         case LDP_MSG_KEEPALIVE:
 636         case LDP_MSG_ADDRESS:
 637         case LDP_MSG_LABEL_MAPPING:
 638         case LDP_MSG_ADDRESS_WITHDRAW:
 639         case LDP_MSG_LABEL_WITHDRAW:
 640             while(msg_tlen >= 4) {
 641                 processed = ldp_tlv_print(msg_tptr);
 642                 if (processed == 0)
 643                     break;
 644                 msg_tlen-=processed;
 645                 msg_tptr+=processed;
 646             }
 647             break;
 648
 649         /*
 650          *  FIXME those are the defined messages that lack a decoder
 651          *  you are welcome to contribute code ;-)
 652          */
 653
 654         case LDP_MSG_LABEL_REQUEST:
 655         case LDP_MSG_LABEL_RELEASE:
 656         case LDP_MSG_LABEL_ABORT_REQUEST:
 657
 658         default:
 659             if (vflag <= 1)
 660                 print_unknown_data(gndo,msg_tptr,"\n\t  ",msg_tlen);
 661             break;
 662         }
 663         /* do we want to see an additionally hexdump ? */
 664         if (vflag > 1 || hexdump==TRUE)
 665             print_unknown_data(gndo,tptr+sizeof(struct ldp_msg_header),"\n\t  ",
 666                                msg_len);
 667
 668         tptr += msg_len+4;
 669         tlen -= msg_len+4;
 670     }
 671     return pdu_len+4;
 672 trunc:
 673     printf("\n\t\t packet exceeded snapshot");
 674     return 0;
 675 }
 676
 677 /*
 678  * Local Variables:
 679  * c-style: whitesmith
 680  * c-basic-offset: 8
 681  * End:
 682  */