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 #define NETDISSECT_REWORKED
  18 #ifdef HAVE_CONFIG_H
  19 #include "config.h"
  20 #endif
  21
  22 #include <tcpdump-stdinc.h>
  23
  24 #include "interface.h"
  25 #include "extract.h"
  26 #include "addrtoname.h"
  27
  28 #include "l2vpn.h"
  29 #include "af.h"
  30
  31 /*
  32  * ldp common header
  33  *
  34  *  0                   1                   2                   3
  35  *  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
  36  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  37  * |  Version                      |         PDU Length            |
  38  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  39  * |                         LDP Identifier                        |
  40  * +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  41  * |                               |
  42  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  43  *
  44  */
  45
  46 struct ldp_common_header {
  47     uint8_t version[2];
  48     uint8_t pdu_length[2];
  49     uint8_t lsr_id[4];
  50     uint8_t label_space[2];
  51 };
  52
  53 #define LDP_VERSION 1
  54
  55 /*
  56  * ldp message header
  57  *
  58  *  0                   1                   2                   3
  59  *  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
  60  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  61  * |U|   Message Type              |      Message Length           |
  62  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  63  * |                     Message ID                                |
  64  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  65  * |                                                               |
  66  * +                                                               +
  67  * |                     Mandatory Parameters                      |
  68  * +                                                               +
  69  * |                                                               |
  70  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  71  * |                                                               |
  72  * +                                                               +
  73  * |                     Optional Parameters                       |
  74  * +                                                               +
  75  * |                                                               |
  76  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  77  */
  78
  79 struct ldp_msg_header {
  80     uint8_t type[2];
  81     uint8_t length[2];
  82     uint8_t id[4];
  83 };
  84
  85 #define LDP_MASK_MSG_TYPE(x)  ((x)&0x7fff)
  86 #define LDP_MASK_U_BIT(x)     ((x)&0x8000)
  87
  88 #define LDP_MSG_NOTIF                0x0001
  89 #define LDP_MSG_HELLO                0x0100
  90 #define LDP_MSG_INIT                 0x0200
  91 #define LDP_MSG_KEEPALIVE            0x0201
  92 #define LDP_MSG_ADDRESS              0x0300
  93 #define LDP_MSG_ADDRESS_WITHDRAW     0x0301
  94 #define LDP_MSG_LABEL_MAPPING        0x0400
  95 #define LDP_MSG_LABEL_REQUEST        0x0401
  96 #define LDP_MSG_LABEL_WITHDRAW       0x0402
  97 #define LDP_MSG_LABEL_RELEASE        0x0403
  98 #define LDP_MSG_LABEL_ABORT_REQUEST  0x0404
  99
 100 #define LDP_VENDOR_PRIVATE_MIN       0x3e00
 101 #define LDP_VENDOR_PRIVATE_MAX       0x3eff
 102 #define LDP_EXPERIMENTAL_MIN         0x3f00
 103 #define LDP_EXPERIMENTAL_MAX         0x3fff
 104
 105 static const struct tok ldp_msg_values[] = {
 106     { LDP_MSG_NOTIF,                 "Notification" },
 107     { LDP_MSG_HELLO,                 "Hello" },
 108     { LDP_MSG_INIT,                  "Initialization" },
 109     { LDP_MSG_KEEPALIVE,             "Keepalive" },
 110     { LDP_MSG_ADDRESS,               "Address" },
 111     { LDP_MSG_ADDRESS_WITHDRAW,      "Address Withdraw" },
 112     { LDP_MSG_LABEL_MAPPING,         "Label Mapping" },
 113     { LDP_MSG_LABEL_REQUEST,         "Label Request" },
 114     { LDP_MSG_LABEL_WITHDRAW,        "Label Withdraw" },
 115     { LDP_MSG_LABEL_RELEASE,         "Label Release" },
 116     { LDP_MSG_LABEL_ABORT_REQUEST,   "Label Abort Request" },
 117     { 0, NULL}
 118 };
 119
 120 #define LDP_MASK_TLV_TYPE(x)  ((x)&0x3fff)
 121 #define LDP_MASK_F_BIT(x) ((x)&0x4000)
 122
 123 #define LDP_TLV_FEC                  0x0100
 124 #define LDP_TLV_ADDRESS_LIST         0x0101
 125 #define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2
 126 #define LDP_TLV_HOP_COUNT            0x0103
 127 #define LDP_TLV_PATH_VECTOR          0x0104
 128 #define LDP_TLV_GENERIC_LABEL        0x0200
 129 #define LDP_TLV_ATM_LABEL            0x0201
 130 #define LDP_TLV_FR_LABEL             0x0202
 131 #define LDP_TLV_STATUS               0x0300
 132 #define LDP_TLV_EXTD_STATUS          0x0301
 133 #define LDP_TLV_RETURNED_PDU         0x0302
 134 #define LDP_TLV_RETURNED_MSG         0x0303
 135 #define LDP_TLV_COMMON_HELLO         0x0400
 136 #define LDP_TLV_IPV4_TRANSPORT_ADDR  0x0401
 137 #define LDP_TLV_CONFIG_SEQ_NUMBER    0x0402
 138 #define LDP_TLV_IPV6_TRANSPORT_ADDR  0x0403
 139 #define LDP_TLV_COMMON_SESSION       0x0500
 140 #define LDP_TLV_ATM_SESSION_PARM     0x0501
 141 #define LDP_TLV_FR_SESSION_PARM      0x0502
 142 #define LDP_TLV_FT_SESSION           0x0503
 143 #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
 144 #define LDP_TLV_MTU                  0x0601 /* rfc 3988 */
 145
 146 static const struct tok ldp_tlv_values[] = {
 147     { LDP_TLV_FEC,                   "FEC" },
 148     { LDP_TLV_ADDRESS_LIST,          "Address List" },
 149     { LDP_TLV_HOP_COUNT,             "Hop Count" },
 150     { LDP_TLV_PATH_VECTOR,           "Path Vector" },
 151     { LDP_TLV_GENERIC_LABEL,         "Generic Label" },
 152     { LDP_TLV_ATM_LABEL,             "ATM Label" },
 153     { LDP_TLV_FR_LABEL,              "Frame-Relay Label" },
 154     { LDP_TLV_STATUS,                "Status" },
 155     { LDP_TLV_EXTD_STATUS,           "Extended Status" },
 156     { LDP_TLV_RETURNED_PDU,          "Returned PDU" },
 157     { LDP_TLV_RETURNED_MSG,          "Returned Message" },
 158     { LDP_TLV_COMMON_HELLO,          "Common Hello Parameters" },
 159     { LDP_TLV_IPV4_TRANSPORT_ADDR,   "IPv4 Transport Address" },
 160     { LDP_TLV_CONFIG_SEQ_NUMBER,     "Configuration Sequence Number" },
 161     { LDP_TLV_IPV6_TRANSPORT_ADDR,   "IPv6 Transport Address" },
 162     { LDP_TLV_COMMON_SESSION,        "Common Session Parameters" },
 163     { LDP_TLV_ATM_SESSION_PARM,      "ATM Session Parameters" },
 164     { LDP_TLV_FR_SESSION_PARM,       "Frame-Relay Session Parameters" },
 165     { LDP_TLV_FT_SESSION,            "Fault-Tolerant Session Parameters" },
 166     { LDP_TLV_LABEL_REQUEST_MSG_ID,  "Label Request Message ID" },
 167     { LDP_TLV_MTU,                   "MTU" },
 168     { 0, NULL}
 169 };
 170
 171 #define LDP_FEC_WILDCARD        0x01
 172 #define LDP_FEC_PREFIX          0x02
 173 #define LDP_FEC_HOSTADDRESS     0x03
 174 /* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
 175 #define LDP_FEC_MARTINI_VC      0x80
 176
 177 static const struct tok ldp_fec_values[] = {
 178     { LDP_FEC_WILDCARD,         "Wildcard" },
 179     { LDP_FEC_PREFIX,           "Prefix" },
 180     { LDP_FEC_HOSTADDRESS,      "Host address" },
 181     { LDP_FEC_MARTINI_VC,       "Martini VC" },
 182     { 0, NULL}
 183 };
 184
 185 #define LDP_FEC_MARTINI_IFPARM_MTU  0x01
 186 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
 187 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
 188
 189 static const struct tok ldp_fec_martini_ifparm_values[] = {
 190     { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
 191     { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
 192     { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
 193     { 0, NULL}
 194 };
 195
 196 /* draft-ietf-pwe3-vccv-04.txt */
 197 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
 198     { 0x01, "PWE3 control word" },
 199     { 0x02, "MPLS Router Alert Label" },
 200     { 0x04, "MPLS inner label TTL = 1" },
 201     { 0, NULL}
 202 };
 203
 204 /* draft-ietf-pwe3-vccv-04.txt */
 205 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
 206     { 0x01, "ICMP Ping" },
 207     { 0x02, "LSP Ping" },
 208     { 0x04, "BFD" },
 209     { 0, NULL}
 210 };
 211
 212 static int ldp_msg_print(netdissect_options *, register const u_char *);
 213
 214 /*
 215  * ldp tlv header
 216  *
 217  *  0                   1                   2                   3
 218  *  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
 219  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 220  * |U|F|        Type               |            Length             |
 221  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 222  * |                                                               |
 223  * |                             Value                             |
 224  * ~                                                               ~
 225  * |                                                               |
 226  * |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 227  * |                               |
 228  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 229  */
 230
 231 #define TLV_TCHECK(minlen) \
 232     ND_TCHECK2(*tptr, minlen); if (tlv_tlen < minlen) goto badtlv;
 233
 234 static int
 235 ldp_tlv_print(netdissect_options *ndo,
 236               register const u_char *tptr) {
 237
 238     struct ldp_tlv_header {
 239         uint8_t type[2];
 240         uint8_t length[2];
 241     };
 242
 243     const struct ldp_tlv_header *ldp_tlv_header;
 244     u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
 245     u_char fec_type;
 246     u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
 247     char buf[100];
 248     int i;
 249
 250     ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
 251     tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
 252     tlv_tlen=tlv_len;
 253     tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
 254
 255     /* FIXME vendor private / experimental check */
 256     ND_PRINT((ndo, "\n\t    %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
 257            tok2str(ldp_tlv_values,
 258                    "Unknown",
 259                    tlv_type),
 260            tlv_type,
 261            tlv_len,
 262            LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
 263            LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't"));
 264
 265     tptr+=sizeof(struct ldp_tlv_header);
 266
 267     switch(tlv_type) {
 268
 269     case LDP_TLV_COMMON_HELLO:
 270         TLV_TCHECK(4);
 271         ND_PRINT((ndo, "\n\t      Hold Time: %us, Flags: [%s Hello%s]",
 272                EXTRACT_16BITS(tptr),
 273                (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
 274                (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : ""));
 275         break;
 276
 277     case LDP_TLV_IPV4_TRANSPORT_ADDR:
 278         TLV_TCHECK(4);
 279         ND_PRINT((ndo, "\n\t      IPv4 Transport Address: %s", ipaddr_string(ndo, tptr)));
 280         break;
 281 #ifdef INET6
 282     case LDP_TLV_IPV6_TRANSPORT_ADDR:
 283         TLV_TCHECK(16);
 284         ND_PRINT((ndo, "\n\t      IPv6 Transport Address: %s", ip6addr_string(ndo, tptr)));
 285         break;
 286 #endif
 287     case LDP_TLV_CONFIG_SEQ_NUMBER:
 288         TLV_TCHECK(4);
 289         ND_PRINT((ndo, "\n\t      Sequence Number: %u", EXTRACT_32BITS(tptr)));
 290         break;
 291
 292     case LDP_TLV_ADDRESS_LIST:
 293         TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
 294         af = EXTRACT_16BITS(tptr);
 295         tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 296         tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 297         ND_PRINT((ndo, "\n\t      Address Family: %s, addresses",
 298                tok2str(af_values, "Unknown (%u)", af)));
 299         switch (af) {
 300         case AFNUM_INET:
 301             while(tlv_tlen >= sizeof(struct in_addr)) {
 302                 ND_TCHECK2(*tptr, sizeof(struct in_addr));
 303                 ND_PRINT((ndo, " %s", ipaddr_string(ndo, tptr)));
 304                 tlv_tlen-=sizeof(struct in_addr);
 305                 tptr+=sizeof(struct in_addr);
 306             }
 307             break;
 308 #ifdef INET6
 309         case AFNUM_INET6:
 310             while(tlv_tlen >= sizeof(struct in6_addr)) {
 311                 ND_TCHECK2(*tptr, sizeof(struct in6_addr));
 312                 ND_PRINT((ndo, " %s", ip6addr_string(ndo, tptr)));
 313                 tlv_tlen-=sizeof(struct in6_addr);
 314                 tptr+=sizeof(struct in6_addr);
 315             }
 316             break;
 317 #endif
 318         default:
 319             /* unknown AF */
 320             break;
 321         }
 322         break;
 323
 324     case LDP_TLV_COMMON_SESSION:
 325         TLV_TCHECK(8);
 326         ND_PRINT((ndo, "\n\t      Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
 327                EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
 328                (EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
 329                (EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
 330                ));
 331         break;
 332
 333     case LDP_TLV_FEC:
 334         TLV_TCHECK(1);
 335         fec_type = *tptr;
 336         ND_PRINT((ndo, "\n\t      %s FEC (0x%02x)",
 337                tok2str(ldp_fec_values, "Unknown", fec_type),
 338                fec_type));
 339
 340         tptr+=1;
 341         tlv_tlen-=1;
 342         switch(fec_type) {
 343
 344         case LDP_FEC_WILDCARD:
 345             break;
 346         case LDP_FEC_PREFIX:
 347             TLV_TCHECK(2);
 348             af = EXTRACT_16BITS(tptr);
 349             tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 350             tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 351             if (af == AFNUM_INET) {
 352                 i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
 353                 if (i == -2)
 354                     goto trunc;
 355                 if (i == -3)
 356                     ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
 357                 else if (i == -1)
 358                     ND_PRINT((ndo, ": IPv4 prefix (invalid length)"));
 359                 else
 360                     ND_PRINT((ndo, ": IPv4 prefix %s", buf));
 361             }
 362 #ifdef INET6
 363             else if (af == AFNUM_INET6) {
 364                 i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
 365                 if (i == -2)
 366                     goto trunc;
 367                 if (i == -3)
 368                     ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
 369                 else if (i == -1)
 370                     ND_PRINT((ndo, ": IPv6 prefix (invalid length)"));
 371                 else
 372                     ND_PRINT((ndo, ": IPv6 prefix %s", buf));
 373             }
 374 #endif
 375             else
 376                 ND_PRINT((ndo, ": Address family %u prefix", af));
 377             break;
 378         case LDP_FEC_HOSTADDRESS:
 379             break;
 380         case LDP_FEC_MARTINI_VC:
 381             /*
 382              * According to RFC 4908, the VC info Length field can be zero,
 383              * in which case not only are there no interface parameters,
 384              * there's no VC ID.
 385              */
 386             TLV_TCHECK(7);
 387             vc_info_len = *(tptr+2);
 388
 389             if (vc_info_len == 0) {
 390                 ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-info-length: %u",
 391                        tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
 392                        EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
 393                        EXTRACT_32BITS(tptr+3),
 394                        vc_info_len));
 395                 break;
 396             }
 397
 398             /* Make sure we have the VC ID as well */
 399             TLV_TCHECK(11);
 400             ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
 401                    tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
 402                    EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
 403                    EXTRACT_32BITS(tptr+3),
 404                    EXTRACT_32BITS(tptr+7),
 405                    vc_info_len));
 406             if (vc_info_len < 4)
 407                 goto trunc; /* minimum 4, for the VC ID */
 408             vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
 409
 410             /* Skip past the fixed information and the VC ID */
 411             tptr+=11;
 412             tlv_tlen-=11;
 413             TLV_TCHECK(vc_info_len);
 414
 415             while (vc_info_len > 2) {
 416                 vc_info_tlv_type = *tptr;
 417                 vc_info_tlv_len = *(tptr+1);
 418                 if (vc_info_tlv_len < 2)
 419                     break;
 420                 if (vc_info_len < vc_info_tlv_len)
 421                     break;
 422
 423                 ND_PRINT((ndo, "\n\t\tInterface Parameter: %s (0x%02x), len %u",
 424                        tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
 425                        vc_info_tlv_type,
 426                        vc_info_tlv_len));
 427
 428                 switch(vc_info_tlv_type) {
 429                 case LDP_FEC_MARTINI_IFPARM_MTU:
 430                     ND_PRINT((ndo, ": %u", EXTRACT_16BITS(tptr+2)));
 431                     break;
 432
 433                 case LDP_FEC_MARTINI_IFPARM_DESC:
 434                     ND_PRINT((ndo, ": "));
 435                     for (idx = 2; idx < vc_info_tlv_len; idx++)
 436                         safeputchar(ndo, *(tptr + idx));
 437                     break;
 438
 439                 case LDP_FEC_MARTINI_IFPARM_VCCV:
 440                     ND_PRINT((ndo, "\n\t\t  Control Channels (0x%02x) = [%s]",
 441                            *(tptr+2),
 442                            bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", *(tptr+2))));
 443                     ND_PRINT((ndo, "\n\t\t  CV Types (0x%02x) = [%s]",
 444                            *(tptr+3),
 445                            bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", *(tptr+3))));
 446                     break;
 447
 448                 default:
 449                     print_unknown_data(ndo, tptr+2, "\n\t\t  ", vc_info_tlv_len-2);
 450                     break;
 451                 }
 452
 453                 vc_info_len -= vc_info_tlv_len;
 454                 tptr += vc_info_tlv_len;
 455             }
 456             break;
 457         }
 458
 459         break;
 460
 461     case LDP_TLV_GENERIC_LABEL:
 462         TLV_TCHECK(4);
 463         ND_PRINT((ndo, "\n\t      Label: %u", EXTRACT_32BITS(tptr) & 0xfffff));
 464         break;
 465
 466     case LDP_TLV_STATUS:
 467         TLV_TCHECK(8);
 468         ui = EXTRACT_32BITS(tptr);
 469         tptr+=4;
 470         ND_PRINT((ndo, "\n\t      Status: 0x%02x, Flags: [%s and %s forward]",
 471                ui&0x3fffffff,
 472                ui&0x80000000 ? "Fatal error" : "Advisory Notification",
 473                ui&0x40000000 ? "do" : "don't"));
 474         ui = EXTRACT_32BITS(tptr);
 475         tptr+=4;
 476         if (ui)
 477             ND_PRINT((ndo, ", causing Message ID: 0x%08x", ui));
 478         break;
 479
 480     case LDP_TLV_FT_SESSION:
 481         TLV_TCHECK(8);
 482         ft_flags = EXTRACT_16BITS(tptr);
 483         ND_PRINT((ndo, "\n\t      Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
 484                ft_flags&0x8000 ? "" : "No ",
 485                ft_flags&0x8 ? "" : "Don't ",
 486                ft_flags&0x4 ? "" : "No ",
 487                ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
 488                ft_flags&0x1 ? "" : "Don't "));
 489         tptr+=4;
 490         ui = EXTRACT_32BITS(tptr);
 491         if (ui)
 492             ND_PRINT((ndo, ", Reconnect Timeout: %ums", ui));
 493         tptr+=4;
 494         ui = EXTRACT_32BITS(tptr);
 495         if (ui)
 496             ND_PRINT((ndo, ", Recovery Time: %ums", ui));
 497         break;
 498
 499     case LDP_TLV_MTU:
 500         TLV_TCHECK(2);
 501         ND_PRINT((ndo, "\n\t      MTU: %u", EXTRACT_16BITS(tptr)));
 502         break;
 503
 504
 505     /*
 506      *  FIXME those are the defined TLVs that lack a decoder
 507      *  you are welcome to contribute code ;-)
 508      */
 509
 510     case LDP_TLV_HOP_COUNT:
 511     case LDP_TLV_PATH_VECTOR:
 512     case LDP_TLV_ATM_LABEL:
 513     case LDP_TLV_FR_LABEL:
 514     case LDP_TLV_EXTD_STATUS:
 515     case LDP_TLV_RETURNED_PDU:
 516     case LDP_TLV_RETURNED_MSG:
 517     case LDP_TLV_ATM_SESSION_PARM:
 518     case LDP_TLV_FR_SESSION_PARM:
 519     case LDP_TLV_LABEL_REQUEST_MSG_ID:
 520
 521     default:
 522         if (ndo->ndo_vflag <= 1)
 523             print_unknown_data(ndo, tptr, "\n\t      ", tlv_tlen);
 524         break;
 525     }
 526     return(tlv_len+4); /* Type & Length fields not included */
 527
 528 trunc:
 529     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 530     return 0;
 531
 532 badtlv:
 533     ND_PRINT((ndo, "\n\t\t TLV contents go past end of TLV"));
 534     return(tlv_len+4); /* Type & Length fields not included */
 535 }
 536
 537 void
 538 ldp_print(netdissect_options *ndo,
 539           register const u_char *pptr, register u_int len) {
 540
 541     int processed;
 542     while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
 543         processed = ldp_msg_print(ndo, pptr);
 544         if (processed == 0)
 545             return;
 546         len -= processed;
 547         pptr += processed;
 548     }
 549 }
 550
 551 static int
 552 ldp_msg_print(netdissect_options *ndo,
 553               register const u_char *pptr) {
 554
 555     const struct ldp_common_header *ldp_com_header;
 556     const struct ldp_msg_header *ldp_msg_header;
 557     const u_char *tptr,*msg_tptr;
 558     u_short tlen;
 559     u_short pdu_len,msg_len,msg_type,msg_tlen;
 560     int hexdump,processed;
 561
 562     tptr=pptr;
 563     ldp_com_header = (const struct ldp_common_header *)pptr;
 564     ND_TCHECK(*ldp_com_header);
 565
 566     /*
 567      * Sanity checking of the header.
 568      */
 569     if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
 570         ND_PRINT((ndo, "%sLDP version %u packet not supported",
 571                (ndo->ndo_vflag < 1) ? "" : "\n\t",
 572                EXTRACT_16BITS(&ldp_com_header->version)));
 573         return 0;
 574     }
 575
 576     /* print the LSR-ID, label-space & length */
 577     pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
 578     ND_PRINT((ndo, "%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
 579            (ndo->ndo_vflag < 1) ? "" : "\n\t",
 580            ipaddr_string(ndo, &ldp_com_header->lsr_id),
 581            EXTRACT_16BITS(&ldp_com_header->label_space),
 582            pdu_len));
 583
 584     /* bail out if non-verbose */
 585     if (ndo->ndo_vflag < 1)
 586         return 0;
 587
 588     /* ok they seem to want to know everything - lets fully decode it */
 589     tlen=pdu_len;
 590
 591     tptr += sizeof(const struct ldp_common_header);
 592     tlen -= sizeof(const struct ldp_common_header)-4;   /* Type & Length fields not included */
 593
 594     while(tlen>0) {
 595         /* did we capture enough for fully decoding the msg header ? */
 596         ND_TCHECK2(*tptr, sizeof(struct ldp_msg_header));
 597
 598         ldp_msg_header = (const struct ldp_msg_header *)tptr;
 599         msg_len=EXTRACT_16BITS(ldp_msg_header->length);
 600         msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
 601
 602         /* FIXME vendor private / experimental check */
 603         ND_PRINT((ndo, "\n\t  %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
 604                tok2str(ldp_msg_values,
 605                        "Unknown",
 606                        msg_type),
 607                msg_type,
 608                msg_len,
 609                EXTRACT_32BITS(&ldp_msg_header->id),
 610                LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore"));
 611
 612         if (msg_len == 0) /* infinite loop protection */
 613             return 0;
 614
 615         msg_tptr=tptr+sizeof(struct ldp_msg_header);
 616         msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */
 617
 618         /* did we capture enough for fully decoding the message ? */
 619         ND_TCHECK2(*tptr, msg_len);
 620         hexdump=FALSE;
 621
 622         switch(msg_type) {
 623
 624         case LDP_MSG_NOTIF:
 625         case LDP_MSG_HELLO:
 626         case LDP_MSG_INIT:
 627         case LDP_MSG_KEEPALIVE:
 628         case LDP_MSG_ADDRESS:
 629         case LDP_MSG_LABEL_MAPPING:
 630         case LDP_MSG_ADDRESS_WITHDRAW:
 631         case LDP_MSG_LABEL_WITHDRAW:
 632             while(msg_tlen >= 4) {
 633                 processed = ldp_tlv_print(ndo, msg_tptr);
 634                 if (processed == 0)
 635                     break;
 636                 msg_tlen-=processed;
 637                 msg_tptr+=processed;
 638             }
 639             break;
 640
 641         /*
 642          *  FIXME those are the defined messages that lack a decoder
 643          *  you are welcome to contribute code ;-)
 644          */
 645
 646         case LDP_MSG_LABEL_REQUEST:
 647         case LDP_MSG_LABEL_RELEASE:
 648         case LDP_MSG_LABEL_ABORT_REQUEST:
 649
 650         default:
 651             if (ndo->ndo_vflag <= 1)
 652                 print_unknown_data(ndo, msg_tptr, "\n\t  ", msg_tlen);
 653             break;
 654         }
 655         /* do we want to see an additionally hexdump ? */
 656         if (ndo->ndo_vflag > 1 || hexdump==TRUE)
 657             print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t  ",
 658                                msg_len);
 659
 660         tptr += msg_len+4;
 661         tlen -= msg_len+4;
 662     }
 663     return pdu_len+4;
 664 trunc:
 665     ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
 666     return 0;
 667 }
 668
 669 /*
 670  * Local Variables:
 671  * c-style: whitesmith
 672  * c-basic-offset: 8
 673  * End:
 674  */