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@gredler.at)
  14  *  and Steinar Haug (sthaug@nethelp.no)
  15  */
  16
  17 /* \summary: Label Distribution Protocol (LDP) printer */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #endif
  22
  23 #include "netdissect-stdinc.h"
  24
  25 #include "netdissect.h"
  26 #include "extract.h"
  27 #include "addrtoname.h"
  28
  29 #include "l2vpn.h"
  30 #include "af.h"
  31
  32
  33 /*
  34  * ldp common header
  35  *
  36  *  0                   1                   2                   3
  37  *  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
  38  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  39  * |  Version                      |         PDU Length            |
  40  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  41  * |                         LDP Identifier                        |
  42  * +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  43  * |                               |
  44  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  45  *
  46  */
  47
  48 struct ldp_common_header {
  49     nd_uint16_t version;
  50     nd_uint16_t pdu_length;
  51     nd_ipv4     lsr_id;
  52     nd_uint16_t label_space;
  53 };
  54
  55 #define LDP_VERSION 1
  56
  57 /*
  58  * ldp message header
  59  *
  60  *  0                   1                   2                   3
  61  *  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
  62  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  63  * |U|   Message Type              |      Message Length           |
  64  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  65  * |                     Message ID                                |
  66  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  67  * |                                                               |
  68  * +                                                               +
  69  * |                     Mandatory Parameters                      |
  70  * +                                                               +
  71  * |                                                               |
  72  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  73  * |                                                               |
  74  * +                                                               +
  75  * |                     Optional Parameters                       |
  76  * +                                                               +
  77  * |                                                               |
  78  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  79  */
  80
  81 struct ldp_msg_header {
  82     nd_uint16_t type;
  83     nd_uint16_t length;
  84     nd_uint32_t id;
  85 };
  86
  87 #define LDP_MASK_MSG_TYPE(x)  ((x)&0x7fff)
  88 #define LDP_MASK_U_BIT(x)     ((x)&0x8000)
  89
  90 #define LDP_MSG_NOTIF                0x0001
  91 #define LDP_MSG_HELLO                0x0100
  92 #define LDP_MSG_INIT                 0x0200
  93 #define LDP_MSG_KEEPALIVE            0x0201
  94 #define LDP_MSG_ADDRESS              0x0300
  95 #define LDP_MSG_ADDRESS_WITHDRAW     0x0301
  96 #define LDP_MSG_LABEL_MAPPING        0x0400
  97 #define LDP_MSG_LABEL_REQUEST        0x0401
  98 #define LDP_MSG_LABEL_WITHDRAW       0x0402
  99 #define LDP_MSG_LABEL_RELEASE        0x0403
 100 #define LDP_MSG_LABEL_ABORT_REQUEST  0x0404
 101
 102 #define LDP_VENDOR_PRIVATE_MIN       0x3e00
 103 #define LDP_VENDOR_PRIVATE_MAX       0x3eff
 104 #define LDP_EXPERIMENTAL_MIN         0x3f00
 105 #define LDP_EXPERIMENTAL_MAX         0x3fff
 106
 107 static const struct tok ldp_msg_values[] = {
 108     { LDP_MSG_NOTIF,                 "Notification" },
 109     { LDP_MSG_HELLO,                 "Hello" },
 110     { LDP_MSG_INIT,                  "Initialization" },
 111     { LDP_MSG_KEEPALIVE,             "Keepalive" },
 112     { LDP_MSG_ADDRESS,               "Address" },
 113     { LDP_MSG_ADDRESS_WITHDRAW,      "Address Withdraw" },
 114     { LDP_MSG_LABEL_MAPPING,         "Label Mapping" },
 115     { LDP_MSG_LABEL_REQUEST,         "Label Request" },
 116     { LDP_MSG_LABEL_WITHDRAW,        "Label Withdraw" },
 117     { LDP_MSG_LABEL_RELEASE,         "Label Release" },
 118     { LDP_MSG_LABEL_ABORT_REQUEST,   "Label Abort Request" },
 119     { 0, NULL}
 120 };
 121
 122 #define LDP_MASK_TLV_TYPE(x)  ((x)&0x3fff)
 123 #define LDP_MASK_F_BIT(x) ((x)&0x4000)
 124
 125 #define LDP_TLV_FEC                  0x0100
 126 #define LDP_TLV_ADDRESS_LIST         0x0101
 127 #define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2
 128 #define LDP_TLV_HOP_COUNT            0x0103
 129 #define LDP_TLV_PATH_VECTOR          0x0104
 130 #define LDP_TLV_GENERIC_LABEL        0x0200
 131 #define LDP_TLV_ATM_LABEL            0x0201
 132 #define LDP_TLV_FR_LABEL             0x0202
 133 #define LDP_TLV_STATUS               0x0300
 134 #define LDP_TLV_EXTD_STATUS          0x0301
 135 #define LDP_TLV_RETURNED_PDU         0x0302
 136 #define LDP_TLV_RETURNED_MSG         0x0303
 137 #define LDP_TLV_COMMON_HELLO         0x0400
 138 #define LDP_TLV_IPV4_TRANSPORT_ADDR  0x0401
 139 #define LDP_TLV_CONFIG_SEQ_NUMBER    0x0402
 140 #define LDP_TLV_IPV6_TRANSPORT_ADDR  0x0403
 141 #define LDP_TLV_COMMON_SESSION       0x0500
 142 #define LDP_TLV_ATM_SESSION_PARM     0x0501
 143 #define LDP_TLV_FR_SESSION_PARM      0x0502
 144 #define LDP_TLV_FT_SESSION           0x0503
 145 #define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
 146 #define LDP_TLV_MTU                  0x0601 /* rfc 3988 */
 147
 148 static const struct tok ldp_tlv_values[] = {
 149     { LDP_TLV_FEC,                   "FEC" },
 150     { LDP_TLV_ADDRESS_LIST,          "Address List" },
 151     { LDP_TLV_HOP_COUNT,             "Hop Count" },
 152     { LDP_TLV_PATH_VECTOR,           "Path Vector" },
 153     { LDP_TLV_GENERIC_LABEL,         "Generic Label" },
 154     { LDP_TLV_ATM_LABEL,             "ATM Label" },
 155     { LDP_TLV_FR_LABEL,              "Frame-Relay Label" },
 156     { LDP_TLV_STATUS,                "Status" },
 157     { LDP_TLV_EXTD_STATUS,           "Extended Status" },
 158     { LDP_TLV_RETURNED_PDU,          "Returned PDU" },
 159     { LDP_TLV_RETURNED_MSG,          "Returned Message" },
 160     { LDP_TLV_COMMON_HELLO,          "Common Hello Parameters" },
 161     { LDP_TLV_IPV4_TRANSPORT_ADDR,   "IPv4 Transport Address" },
 162     { LDP_TLV_CONFIG_SEQ_NUMBER,     "Configuration Sequence Number" },
 163     { LDP_TLV_IPV6_TRANSPORT_ADDR,   "IPv6 Transport Address" },
 164     { LDP_TLV_COMMON_SESSION,        "Common Session Parameters" },
 165     { LDP_TLV_ATM_SESSION_PARM,      "ATM Session Parameters" },
 166     { LDP_TLV_FR_SESSION_PARM,       "Frame-Relay Session Parameters" },
 167     { LDP_TLV_FT_SESSION,            "Fault-Tolerant Session Parameters" },
 168     { LDP_TLV_LABEL_REQUEST_MSG_ID,  "Label Request Message ID" },
 169     { LDP_TLV_MTU,                   "MTU" },
 170     { 0, NULL}
 171 };
 172
 173 #define LDP_FEC_WILDCARD        0x01
 174 #define LDP_FEC_PREFIX          0x02
 175 #define LDP_FEC_HOSTADDRESS     0x03
 176 /* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
 177 #define LDP_FEC_MARTINI_VC      0x80
 178
 179 static const struct tok ldp_fec_values[] = {
 180     { LDP_FEC_WILDCARD,         "Wildcard" },
 181     { LDP_FEC_PREFIX,           "Prefix" },
 182     { LDP_FEC_HOSTADDRESS,      "Host address" },
 183     { LDP_FEC_MARTINI_VC,       "Martini VC" },
 184     { 0, NULL}
 185 };
 186
 187 #define LDP_FEC_MARTINI_IFPARM_MTU  0x01
 188 #define LDP_FEC_MARTINI_IFPARM_DESC 0x03
 189 #define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
 190
 191 static const struct tok ldp_fec_martini_ifparm_values[] = {
 192     { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
 193     { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
 194     { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
 195     { 0, NULL}
 196 };
 197
 198 /* draft-ietf-pwe3-vccv-04.txt */
 199 static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
 200     { 0x01, "PWE3 control word" },
 201     { 0x02, "MPLS Router Alert Label" },
 202     { 0x04, "MPLS inner label TTL = 1" },
 203     { 0, NULL}
 204 };
 205
 206 /* draft-ietf-pwe3-vccv-04.txt */
 207 static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
 208     { 0x01, "ICMP Ping" },
 209     { 0x02, "LSP Ping" },
 210     { 0x04, "BFD" },
 211     { 0, NULL}
 212 };
 213
 214 static u_int ldp_pdu_print(netdissect_options *, const u_char *);
 215
 216 /*
 217  * ldp tlv header
 218  *
 219  *  0                   1                   2                   3
 220  *  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
 221  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 222  * |U|F|        Type               |            Length             |
 223  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 224  * |                                                               |
 225  * |                             Value                             |
 226  * ~                                                               ~
 227  * |                                                               |
 228  * |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 229  * |                               |
 230  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 231  */
 232
 233 #define TLV_TCHECK(minlen) \
 234     if (tlv_tlen < minlen) { \
 235         ND_PRINT(" [tlv length %u < %u]", tlv_tlen, minlen); \
 236         nd_print_invalid(ndo); \
 237         goto invalid; \
 238     }
 239
 240 static u_int
 241 ldp_tlv_print(netdissect_options *ndo,
 242               const u_char *tptr,
 243               u_int msg_tlen)
 244 {
 245     struct ldp_tlv_header {
 246         nd_uint16_t type;
 247         nd_uint16_t length;
 248     };
 249
 250     const struct ldp_tlv_header *ldp_tlv_header;
 251     u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
 252     u_char fec_type;
 253     u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
 254     char buf[100];
 255     int i;
 256
 257     ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
 258     ND_TCHECK_SIZE(ldp_tlv_header);
 259     tlv_len=GET_BE_U_2(ldp_tlv_header->length);
 260     if (tlv_len + 4U > msg_tlen) {
 261         ND_PRINT("\n\t\t TLV contents go past end of message");
 262         return 0;
 263     }
 264     tlv_tlen=tlv_len;
 265     tlv_type=LDP_MASK_TLV_TYPE(GET_BE_U_2(ldp_tlv_header->type));
 266
 267     /* FIXME vendor private / experimental check */
 268     ND_PRINT("\n\t    %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
 269            tok2str(ldp_tlv_values,
 270                    "Unknown",
 271                    tlv_type),
 272            tlv_type,
 273            tlv_len,
 274            LDP_MASK_U_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "continue processing" : "ignore",
 275            LDP_MASK_F_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "do" : "don't");
 276
 277     tptr+=sizeof(struct ldp_tlv_header);
 278
 279     switch(tlv_type) {
 280
 281     case LDP_TLV_COMMON_HELLO:
 282         TLV_TCHECK(4);
 283         ND_PRINT("\n\t      Hold Time: %us, Flags: [%s Hello%s]",
 284                GET_BE_U_2(tptr),
 285                (GET_BE_U_2(tptr + 2)&0x8000) ? "Targeted" : "Link",
 286                (GET_BE_U_2(tptr + 2)&0x4000) ? ", Request for targeted Hellos" : "");
 287         break;
 288
 289     case LDP_TLV_IPV4_TRANSPORT_ADDR:
 290         TLV_TCHECK(4);
 291         ND_PRINT("\n\t      IPv4 Transport Address: %s", GET_IPADDR_STRING(tptr));
 292         break;
 293     case LDP_TLV_IPV6_TRANSPORT_ADDR:
 294         TLV_TCHECK(16);
 295         ND_PRINT("\n\t      IPv6 Transport Address: %s", GET_IP6ADDR_STRING(tptr));
 296         break;
 297     case LDP_TLV_CONFIG_SEQ_NUMBER:
 298         TLV_TCHECK(4);
 299         ND_PRINT("\n\t      Sequence Number: %u", GET_BE_U_4(tptr));
 300         break;
 301
 302     case LDP_TLV_ADDRESS_LIST:
 303         TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
 304         af = GET_BE_U_2(tptr);
 305         tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 306         tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
 307         ND_PRINT("\n\t      Address Family: %s, addresses",
 308                tok2str(af_values, "Unknown (%u)", af));
 309         switch (af) {
 310         case AFNUM_IP:
 311             while(tlv_tlen >= sizeof(nd_ipv4)) {
 312                 ND_PRINT(" %s", GET_IPADDR_STRING(tptr));
 313                 tlv_tlen-=sizeof(nd_ipv4);
 314                 tptr+=sizeof(nd_ipv4);
 315             }
 316             break;
 317         case AFNUM_IP6:
 318             while(tlv_tlen >= sizeof(nd_ipv6)) {
 319                 ND_PRINT(" %s", GET_IP6ADDR_STRING(tptr));
 320                 tlv_tlen-=sizeof(nd_ipv6);
 321                 tptr+=sizeof(nd_ipv6);
 322             }
 323             break;
 324         default:
 325             /* unknown AF */
 326             break;
 327         }
 328         break;
 329
 330     case LDP_TLV_COMMON_SESSION:
 331         TLV_TCHECK(14);
 332         ND_PRINT("\n\t      Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
 333                GET_BE_U_2(tptr), GET_BE_U_2(tptr + 2),
 334                (GET_BE_U_2(tptr + 4)&0x8000) ? "On Demand" : "Unsolicited",
 335                (GET_BE_U_2(tptr + 4)&0x4000) ? "Enabled" : "Disabled"
 336                );
 337         ND_PRINT("\n\t      Path Vector Limit %u, Max-PDU length: %u, Receiver Label-Space-ID %s:%u",
 338                GET_U_1(tptr+5),
 339                GET_BE_U_2(tptr+6),
 340                GET_IPADDR_STRING(tptr+8),
 341                GET_BE_U_2(tptr+12)
 342                );
 343         break;
 344
 345     case LDP_TLV_FEC:
 346         TLV_TCHECK(1);
 347         fec_type = GET_U_1(tptr);
 348         ND_PRINT("\n\t      %s FEC (0x%02x)",
 349                tok2str(ldp_fec_values, "Unknown", fec_type),
 350                fec_type);
 351
 352         tptr+=1;
 353         tlv_tlen-=1;
 354         switch(fec_type) {
 355
 356         case LDP_FEC_WILDCARD:
 357             break;
 358         case LDP_FEC_PREFIX:
 359             TLV_TCHECK(2);
 360             af = GET_BE_U_2(tptr);
 361             tptr+=2;
 362             tlv_tlen-=2;
 363             if (af == AFNUM_IP) {
 364                 i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
 365                 if (i == -2)
 366                     goto trunc;
 367                 if (i == -3)
 368                     ND_PRINT(": IPv4 prefix (goes past end of TLV)");
 369                 else if (i == -1)
 370                     ND_PRINT(": IPv4 prefix (invalid length)");
 371                 else
 372                     ND_PRINT(": IPv4 prefix %s", buf);
 373             } else if (af == AFNUM_IP6) {
 374                 i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
 375                 if (i == -2)
 376                     goto trunc;
 377                 if (i == -3)
 378                     ND_PRINT(": IPv4 prefix (goes past end of TLV)");
 379                 else if (i == -1)
 380                     ND_PRINT(": IPv6 prefix (invalid length)");
 381                 else
 382                     ND_PRINT(": IPv6 prefix %s", buf);
 383             } else
 384                 ND_PRINT(": Address family %u prefix", af);
 385             break;
 386         case LDP_FEC_HOSTADDRESS:
 387             break;
 388         case LDP_FEC_MARTINI_VC:
 389             /*
 390              * We assume the type was supposed to be one of the MPLS
 391              * Pseudowire Types.
 392              */
 393             TLV_TCHECK(7);
 394             vc_info_len = GET_U_1(tptr + 2);
 395
 396             /*
 397              * According to RFC 4908, the VC info Length field can be zero,
 398              * in which case not only are there no interface parameters,
 399              * there's no VC ID.
 400              */
 401             if (vc_info_len == 0) {
 402                 ND_PRINT(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
 403                        tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
 404                        GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
 405                        GET_BE_U_4(tptr + 3),
 406                        vc_info_len);
 407                 break;
 408             }
 409
 410             /* Make sure we have the VC ID as well */
 411             TLV_TCHECK(11);
 412             ND_PRINT(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
 413                    tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
 414                    GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
 415                    GET_BE_U_4(tptr + 3),
 416                    GET_BE_U_4(tptr + 7),
 417                    vc_info_len);
 418             if (vc_info_len < 4) {
 419                 /* minimum 4, for the VC ID */
 420                 ND_PRINT(" (invalid, < 4");
 421                 return(tlv_len+4); /* Type & Length fields not included */
 422             }
 423             vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
 424
 425             /* Skip past the fixed information and the VC ID */
 426             tptr+=11;
 427             tlv_tlen-=11;
 428             TLV_TCHECK(vc_info_len);
 429
 430             while (vc_info_len > 2) {
 431                 vc_info_tlv_type = GET_U_1(tptr);
 432                 vc_info_tlv_len = GET_U_1(tptr + 1);
 433                 if (vc_info_tlv_len < 2)
 434                     break;
 435                 if (vc_info_len < vc_info_tlv_len)
 436                     break;
 437
 438                 ND_PRINT("\n\t\tInterface Parameter: %s (0x%02x), len %u",
 439                        tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
 440                        vc_info_tlv_type,
 441                        vc_info_tlv_len);
 442
 443                 switch(vc_info_tlv_type) {
 444                 case LDP_FEC_MARTINI_IFPARM_MTU:
 445                     ND_PRINT(": %u", GET_BE_U_2(tptr + 2));
 446                     break;
 447
 448                 case LDP_FEC_MARTINI_IFPARM_DESC:
 449                     ND_PRINT(": ");
 450                     for (idx = 2; idx < vc_info_tlv_len; idx++)
 451                         fn_print_char(ndo, GET_U_1(tptr + idx));
 452                     break;
 453
 454                 case LDP_FEC_MARTINI_IFPARM_VCCV:
 455                     ND_PRINT("\n\t\t  Control Channels (0x%02x) = [%s]",
 456                            GET_U_1((tptr + 2)),
 457                            bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", GET_U_1((tptr + 2))));
 458                     ND_PRINT("\n\t\t  CV Types (0x%02x) = [%s]",
 459                            GET_U_1((tptr + 3)),
 460                            bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", GET_U_1((tptr + 3))));
 461                     break;
 462
 463                 default:
 464                     print_unknown_data(ndo, tptr+2, "\n\t\t  ", vc_info_tlv_len-2);
 465                     break;
 466                 }
 467
 468                 vc_info_len -= vc_info_tlv_len;
 469                 tptr += vc_info_tlv_len;
 470             }
 471             break;
 472         }
 473
 474         break;
 475
 476     case LDP_TLV_GENERIC_LABEL:
 477         TLV_TCHECK(4);
 478         ND_PRINT("\n\t      Label: %u", GET_BE_U_4(tptr) & 0xfffff);
 479         break;
 480
 481     case LDP_TLV_STATUS:
 482         TLV_TCHECK(8);
 483         ui = GET_BE_U_4(tptr);
 484         tptr+=4;
 485         ND_PRINT("\n\t      Status: 0x%02x, Flags: [%s and %s forward]",
 486                ui&0x3fffffff,
 487                ui&0x80000000 ? "Fatal error" : "Advisory Notification",
 488                ui&0x40000000 ? "do" : "don't");
 489         ui = GET_BE_U_4(tptr);
 490         tptr+=4;
 491         if (ui)
 492             ND_PRINT(", causing Message ID: 0x%08x", ui);
 493         break;
 494
 495     case LDP_TLV_FT_SESSION:
 496         TLV_TCHECK(12);
 497         ft_flags = GET_BE_U_2(tptr);
 498         ND_PRINT("\n\t      Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
 499                ft_flags&0x8000 ? "" : "No ",
 500                ft_flags&0x8 ? "" : "Don't ",
 501                ft_flags&0x4 ? "" : "No ",
 502                ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
 503                ft_flags&0x1 ? "" : "Don't ");
 504         /* 16 bits (FT Flags) + 16 bits (Reserved) */
 505         tptr+=4;
 506         ui = GET_BE_U_4(tptr);
 507         if (ui)
 508             ND_PRINT(", Reconnect Timeout: %ums", ui);
 509         tptr+=4;
 510         ui = GET_BE_U_4(tptr);
 511         if (ui)
 512             ND_PRINT(", Recovery Time: %ums", ui);
 513         break;
 514
 515     case LDP_TLV_MTU:
 516         TLV_TCHECK(2);
 517         ND_PRINT("\n\t      MTU: %u", GET_BE_U_2(tptr));
 518         break;
 519
 520
 521     /*
 522      *  FIXME those are the defined TLVs that lack a decoder
 523      *  you are welcome to contribute code ;-)
 524      */
 525
 526     case LDP_TLV_HOP_COUNT:
 527     case LDP_TLV_PATH_VECTOR:
 528     case LDP_TLV_ATM_LABEL:
 529     case LDP_TLV_FR_LABEL:
 530     case LDP_TLV_EXTD_STATUS:
 531     case LDP_TLV_RETURNED_PDU:
 532     case LDP_TLV_RETURNED_MSG:
 533     case LDP_TLV_ATM_SESSION_PARM:
 534     case LDP_TLV_FR_SESSION_PARM:
 535     case LDP_TLV_LABEL_REQUEST_MSG_ID:
 536
 537     default:
 538         if (ndo->ndo_vflag <= 1)
 539             print_unknown_data(ndo, tptr, "\n\t      ", tlv_tlen);
 540         break;
 541     }
 542     return(tlv_len+4); /* Type & Length fields not included */
 543
 544 trunc:
 545     nd_trunc_longjmp(ndo);
 546
 547 invalid:
 548     return(tlv_len+4); /* Type & Length fields not included */
 549 }
 550
 551 void
 552 ldp_print(netdissect_options *ndo,
 553           const u_char *pptr, u_int len)
 554 {
 555     u_int processed;
 556
 557     ndo->ndo_protocol = "ldp";
 558     while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
 559         processed = ldp_pdu_print(ndo, pptr);
 560         if (processed == 0)
 561             return;
 562         if (len < processed) {
 563             ND_PRINT(" [remaining length %u < %u]", len, processed);
 564             nd_print_invalid(ndo);
 565             break;
 566         }
 567         len -= processed;
 568         pptr += processed;
 569     }
 570 }
 571
 572 static u_int
 573 ldp_pdu_print(netdissect_options *ndo,
 574               const u_char *pptr)
 575 {
 576     const struct ldp_common_header *ldp_com_header;
 577     const struct ldp_msg_header *ldp_msg_header;
 578     const u_char *tptr,*msg_tptr;
 579     u_short tlen;
 580     u_short pdu_len,msg_len,msg_type;
 581     u_int msg_tlen;
 582     int hexdump,processed;
 583
 584     ldp_com_header = (const struct ldp_common_header *)pptr;
 585     ND_TCHECK_SIZE(ldp_com_header);
 586
 587     /*
 588      * Sanity checking of the header.
 589      */
 590     if (GET_BE_U_2(ldp_com_header->version) != LDP_VERSION) {
 591         ND_PRINT("%sLDP version %u packet not supported",
 592                (ndo->ndo_vflag < 1) ? "" : "\n\t",
 593                GET_BE_U_2(ldp_com_header->version));
 594         return 0;
 595     }
 596
 597     pdu_len = GET_BE_U_2(ldp_com_header->pdu_length);
 598     if (pdu_len < sizeof(struct ldp_common_header)-4) {
 599         /* length too short */
 600         ND_PRINT("%sLDP, pdu-length: %u (too short, < %zu)",
 601                  (ndo->ndo_vflag < 1) ? "" : "\n\t",
 602                  pdu_len,
 603                  sizeof(struct ldp_common_header)-4);
 604         return 0;
 605     }
 606
 607     /* print the LSR-ID, label-space & length */
 608     ND_PRINT("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
 609            (ndo->ndo_vflag < 1) ? "" : "\n\t",
 610            GET_IPADDR_STRING(ldp_com_header->lsr_id),
 611            GET_BE_U_2(ldp_com_header->label_space),
 612            pdu_len);
 613
 614     /* bail out if non-verbose */
 615     if (ndo->ndo_vflag < 1)
 616         return 0;
 617
 618     /* ok they seem to want to know everything - lets fully decode it */
 619     tptr = pptr + sizeof(struct ldp_common_header);
 620     tlen = pdu_len - (sizeof(struct ldp_common_header)-4);      /* Type & Length fields not included */
 621
 622     while(tlen>0) {
 623         /* did we capture enough for fully decoding the msg header ? */
 624         ND_TCHECK_LEN(tptr, sizeof(struct ldp_msg_header));
 625
 626         ldp_msg_header = (const struct ldp_msg_header *)tptr;
 627         msg_len=GET_BE_U_2(ldp_msg_header->length);
 628         msg_type=LDP_MASK_MSG_TYPE(GET_BE_U_2(ldp_msg_header->type));
 629
 630         if (msg_len < sizeof(struct ldp_msg_header)-4) {
 631             /* length too short */
 632             /* FIXME vendor private / experimental check */
 633             ND_PRINT("\n\t  %s Message (0x%04x), length: %u (too short, < %zu)",
 634                      tok2str(ldp_msg_values,
 635                              "Unknown",
 636                              msg_type),
 637                      msg_type,
 638                      msg_len,
 639                      sizeof(struct ldp_msg_header)-4);
 640             return 0;
 641         }
 642
 643         /* FIXME vendor private / experimental check */
 644         ND_PRINT("\n\t  %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
 645                tok2str(ldp_msg_values,
 646                        "Unknown",
 647                        msg_type),
 648                msg_type,
 649                msg_len,
 650                GET_BE_U_4(ldp_msg_header->id),
 651                LDP_MASK_U_BIT(GET_BE_U_2(ldp_msg_header->type)) ? "continue processing" : "ignore");
 652
 653         msg_tptr=tptr+sizeof(struct ldp_msg_header);
 654         msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */
 655
 656         /* did we capture enough for fully decoding the message ? */
 657         ND_TCHECK_LEN(tptr, msg_len);
 658         hexdump=FALSE;
 659
 660         switch(msg_type) {
 661
 662         case LDP_MSG_NOTIF:
 663         case LDP_MSG_HELLO:
 664         case LDP_MSG_INIT:
 665         case LDP_MSG_KEEPALIVE:
 666         case LDP_MSG_ADDRESS:
 667         case LDP_MSG_LABEL_MAPPING:
 668         case LDP_MSG_ADDRESS_WITHDRAW:
 669         case LDP_MSG_LABEL_WITHDRAW:
 670             while(msg_tlen >= 4) {
 671                 processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen);
 672                 if (processed == 0)
 673                     break;
 674                 msg_tlen-=processed;
 675                 msg_tptr+=processed;
 676             }
 677             break;
 678
 679         /*
 680          *  FIXME those are the defined messages that lack a decoder
 681          *  you are welcome to contribute code ;-)
 682          */
 683
 684         case LDP_MSG_LABEL_REQUEST:
 685         case LDP_MSG_LABEL_RELEASE:
 686         case LDP_MSG_LABEL_ABORT_REQUEST:
 687
 688         default:
 689             if (ndo->ndo_vflag <= 1)
 690                 print_unknown_data(ndo, msg_tptr, "\n\t  ", msg_tlen);
 691             break;
 692         }
 693         /* do we want to see an additionally hexdump ? */
 694         if (ndo->ndo_vflag > 1 || hexdump==TRUE)
 695             print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t  ",
 696                                msg_len);
 697
 698         tptr += msg_len+4;
 699         tlen -= msg_len+4;
 700     }
 701     return pdu_len+4;
 702 trunc:
 703     nd_trunc_longjmp(ndo);
 704 }