epan/dissectors/packet-cdp.c

   1 /* packet-cdp.c
   2  * Routines for the disassembly of the "Cisco Discovery Protocol"
   3  * (c) Copyright Hannes R. Boehm <hannes@boehm.org>
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2
  12  * of the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  22  */
  23
  24 #include "config.h"
  25
  26 #include <string.h>
  27
  28 #include <glib.h>
  29 #include <epan/packet.h>
  30 #include <epan/to_str.h>
  31 #include <epan/in_cksum.h>
  32 #include <epan/wmem/wmem.h>
  33
  34 #include <epan/oui.h>
  35 #include <epan/nlpid.h>
  36
  37
  38 /*
  39  * See
  40  *
  41  *      http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm#xtocid12
  42  *
  43  * for some information on CDP.
  44  *
  45  * See
  46  *
  47  *      http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a0080094713.shtml#cdp
  48  *
  49  * for some more information on CDP version 2.
  50  */
  51
  52 void proto_register_cdp(void);
  53 void proto_reg_handoff_cdp(void);
  54
  55 /* Offsets in TLV structure. */
  56 #define TLV_TYPE        0
  57 #define TLV_LENGTH      2
  58
  59 static int proto_cdp = -1;
  60 static int hf_cdp_version = -1;
  61 static int hf_cdp_checksum = -1;
  62 static int hf_cdp_checksum_good = -1;
  63 static int hf_cdp_checksum_bad = -1;
  64 static int hf_cdp_ttl = -1;
  65 static int hf_cdp_tlvtype = -1;
  66 static int hf_cdp_tlvlength = -1;
  67 static int hf_cdp_deviceid = -1;
  68 static int hf_cdp_platform = -1;
  69 static int hf_cdp_portid = -1;
  70 static int hf_cdp_capabilities = -1;
  71 static int hf_cdp_capabilities_router = -1;
  72 static int hf_cdp_capabilities_trans_bridge = -1;
  73 static int hf_cdp_capabilities_src_bridge = -1;
  74 static int hf_cdp_capabilities_switch = -1;
  75 static int hf_cdp_capabilities_host = -1;
  76 static int hf_cdp_capabilities_igmp_capable = -1;
  77 static int hf_cdp_capabilities_repeater = -1;
  78 static int hf_cdp_spare_poe_tlv = -1;
  79 static int hf_cdp_spare_poe_tlv_poe = -1;
  80 static int hf_cdp_spare_poe_tlv_spare_pair_arch = -1;
  81 static int hf_cdp_spare_poe_tlv_req_spare_pair_poe = -1;
  82 static int hf_cdp_spare_poe_tlv_pse_spare_pair_poe = -1;
  83
  84 static gint ett_cdp = -1;
  85 static gint ett_cdp_tlv = -1;
  86 static gint ett_cdp_nrgyz_tlv = -1;
  87 static gint ett_cdp_address = -1;
  88 static gint ett_cdp_capabilities = -1;
  89 static gint ett_cdp_spare_poe_tlv = -1;
  90 static gint ett_cdp_checksum = -1;
  91
  92 static dissector_handle_t data_handle;
  93
  94 static int
  95 dissect_address_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree);
  96 static void
  97 dissect_capabilities(tvbuff_t *tvb, int offset, int length, proto_tree *tree);
  98 static void
  99 dissect_nrgyz_tlv(tvbuff_t *tvb, int offset, guint16 length, guint16 num,
 100   proto_tree *tree);
 101 static void
 102 dissect_spare_poe_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree);
 103 static void
 104 add_multi_line_string_to_tree(proto_tree *tree, tvbuff_t *tvb, gint start,
 105   gint len, const gchar *prefix);
 106
 107 #define TYPE_DEVICE_ID          0x0001
 108 #define TYPE_ADDRESS            0x0002
 109 #define TYPE_PORT_ID            0x0003
 110 #define TYPE_CAPABILITIES       0x0004
 111 #define TYPE_IOS_VERSION        0x0005
 112 #define TYPE_PLATFORM           0x0006
 113 #define TYPE_IP_PREFIX          0x0007
 114 #define TYPE_PROTOCOL_HELLO     0x0008 /* Protocol Hello */
 115 #define TYPE_VTP_MGMT_DOMAIN    0x0009 /* VTP Domain, CTPv2 - see second URL */
 116 #define TYPE_NATIVE_VLAN        0x000a /* Native VLAN, CTPv2 - see second URL */
 117 #define TYPE_DUPLEX             0x000b /* Full/Half Duplex - see second URL */
 118 /*                              0x000c */
 119 /*                              0x000d */
 120 #define TYPE_VOIP_VLAN_REPLY    0x000e /* VoIP VLAN reply */
 121 #define TYPE_VOIP_VLAN_QUERY    0x000f /* VoIP VLAN query */
 122 #define TYPE_POWER              0x0010 /* Power consumption */
 123 #define TYPE_MTU                0x0011 /* MTU */
 124 #define TYPE_TRUST_BITMAP       0x0012 /* Trust bitmap */
 125 #define TYPE_UNTRUSTED_COS      0x0013 /* Untrusted port CoS */
 126 #define TYPE_SYSTEM_NAME        0x0014 /* System Name */
 127 #define TYPE_SYSTEM_OID         0x0015 /* System OID */
 128 #define TYPE_MANAGEMENT_ADDR    0x0016 /* Management Address(es) */
 129 #define TYPE_LOCATION           0x0017 /* Location */
 130 #define TYPE_EXT_PORT_ID        0x0018 /* External Port-ID */
 131 #define TYPE_POWER_REQUESTED    0x0019 /* Power Requested */
 132 #define TYPE_POWER_AVAILABLE    0x001a /* Power Available */
 133 #define TYPE_PORT_UNIDIR        0x001b /* Port Unidirectional */
 134 #define TYPE_NRGYZ              0x001d /* EnergyWise over CDP */
 135 #define TYPE_SPARE_POE          0x001f /* Spare Pair PoE */
 136
 137 #define TYPE_HP_BSSID           0x1000 /* BSSID */
 138 #define TYPE_HP_SERIAL          0x1001 /* Serial number */
 139 #define TYPE_HP_SSID            0x1002 /* SSID */
 140 #define TYPE_HP_RADIO1_CH       0x1003 /* Radio1 channel */
 141 /*                              0x1004 */
 142 /*                              0x1005 */
 143 #define TYPE_HP_SNMP_PORT       0x1006 /* SNMP listening UDP port */
 144 #define TYPE_HP_MGMT_PORT       0x1007 /* Web interface TCP port */
 145 #define TYPE_HP_SOURCE_MAC      0x1008 /* Sender MAC address for the AP, bouth wired and wireless */
 146 #define TYPE_HP_RADIO2_CH       0x1009 /* Radio2 channel */
 147 #define TYPE_HP_RADIO1_OMODE    0x100A /* Radio1 Operating mode */
 148 #define TYPE_HP_RADIO2_OMODE    0x100B /* Radio2 Operating mode */
 149 #define TYPE_HP_RADIO1_RMODE    0x100C /* Radio1 Radio mode */
 150 #define TYPE_HP_RADIO2_RMODE    0x100D /* Radio2 Radio mode */
 151
 152 static const value_string type_vals[] = {
 153     { TYPE_DEVICE_ID,       "Device ID" },
 154     { TYPE_ADDRESS,         "Addresses" },
 155     { TYPE_PORT_ID,         "Port ID" },
 156     { TYPE_CAPABILITIES,    "Capabilities" },
 157     { TYPE_IOS_VERSION,     "Software version" },
 158     { TYPE_PLATFORM,        "Platform" },
 159     { TYPE_IP_PREFIX,       "IP Prefix/Gateway (used for ODR)" },
 160     { TYPE_PROTOCOL_HELLO,  "Protocol Hello" },
 161     { TYPE_VTP_MGMT_DOMAIN, "VTP Management Domain" },
 162     { TYPE_NATIVE_VLAN,     "Native VLAN" },
 163     { TYPE_DUPLEX,          "Duplex" },
 164     { TYPE_VOIP_VLAN_REPLY, "VoIP VLAN Reply" },
 165     { TYPE_VOIP_VLAN_QUERY, "VoIP VLAN Query" },
 166     { TYPE_POWER,           "Power consumption" },
 167     { TYPE_MTU,             "MTU"},
 168     { TYPE_TRUST_BITMAP,    "Trust Bitmap" },
 169     { TYPE_UNTRUSTED_COS,   "Untrusted Port CoS" },
 170     { TYPE_SYSTEM_NAME,     "System Name" },
 171     { TYPE_SYSTEM_OID,      "System Object ID" },
 172     { TYPE_MANAGEMENT_ADDR, "Management Address" },
 173     { TYPE_LOCATION,        "Location" },
 174     { TYPE_EXT_PORT_ID,     "External Port-ID" },
 175     { TYPE_POWER_REQUESTED, "Power Requested" },
 176     { TYPE_POWER_AVAILABLE, "Power Available" },
 177     { TYPE_PORT_UNIDIR,     "Port Unidirectional" },
 178     { TYPE_NRGYZ,           "EnergyWise" },
 179     { TYPE_SPARE_POE,       "Spare PoE" },
 180     { TYPE_HP_BSSID,        "BSSID" },
 181     { TYPE_HP_SERIAL,       "Serial number" },
 182     { TYPE_HP_SSID,         "SSID" },
 183     { TYPE_HP_RADIO1_CH,    "Radio1 channel" },
 184     { TYPE_HP_SNMP_PORT,    "SNMP UDP port" },
 185     { TYPE_HP_MGMT_PORT,    "Web TCP port" },
 186     { TYPE_HP_SOURCE_MAC,   "Source MAC address" },
 187     { TYPE_HP_RADIO2_CH,    "Radio2 channel" },
 188     { TYPE_HP_RADIO1_OMODE, "Radio1 Operating mode" },
 189     { TYPE_HP_RADIO2_OMODE, "Radio2 Operating mode" },
 190     { TYPE_HP_RADIO1_RMODE, "Radio1 Radio mode" },
 191     { TYPE_HP_RADIO2_RMODE, "Radio2 Radio mode" },
 192     { 0, NULL }
 193 };
 194
 195 #define TYPE_HELLO_CLUSTER_MGMT    0x0112
 196
 197 static const value_string type_hello_vals[] = {
 198     { TYPE_HELLO_CLUSTER_MGMT,   "Cluster Management" },
 199     { 0, NULL }
 200 };
 201
 202 #define TYPE_NRGYZ_ROLE    0x00000007
 203 #define TYPE_NRGYZ_DOMAIN  0x00000008
 204 #define TYPE_NRGYZ_NAME    0x00000009
 205 #define TYPE_NRGYZ_REPLYTO 0x00000017
 206
 207 static const value_string type_nrgyz_vals[] = {
 208     { TYPE_NRGYZ_ROLE,    "Role" },
 209     { TYPE_NRGYZ_DOMAIN,  "Domain" },
 210     { TYPE_NRGYZ_NAME,    "Name" },
 211     { TYPE_NRGYZ_REPLYTO, "Reply To" },
 212     { 0, NULL }
 213 };
 214
 215 static void
 216 dissect_cdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 217 {
 218     proto_item *ti, *checksum_item;
 219     proto_tree *cdp_tree = NULL, *checksum_tree;
 220     int         offset   = 0;
 221     guint16     type;
 222     guint16     length, packet_checksum, computed_checksum, data_length;
 223     gboolean    checksum_good, checksum_bad;
 224     proto_item *tlvi     = NULL;
 225     proto_tree *tlv_tree = NULL;
 226     int         real_length;
 227     guint32     naddresses;
 228     guint32     power_avail_len, power_avail;
 229     guint32     power_req_len, power_req;
 230     int         addr_length;
 231     guint32     ip_addr;
 232     vec_t       cksum_vec[1];
 233
 234     col_set_str(pinfo->cinfo, COL_PROTOCOL, "CDP");
 235     col_clear(pinfo->cinfo, COL_INFO);
 236
 237     if (tree) {
 238         ti = proto_tree_add_item(tree, proto_cdp, tvb, offset, -1, ENC_NA);
 239         cdp_tree = proto_item_add_subtree(ti, ett_cdp);
 240
 241         /* CDP header */
 242         proto_tree_add_item(cdp_tree, hf_cdp_version, tvb, offset, 1, ENC_BIG_ENDIAN);
 243         offset += 1;
 244
 245         proto_tree_add_uint_format_value(cdp_tree, hf_cdp_ttl, tvb, offset, 1,
 246                                          tvb_get_guint8(tvb, offset),
 247                                          "%u seconds",
 248                                          tvb_get_guint8(tvb, offset));
 249         offset += 1;
 250     } else {
 251         offset += 2; /* The version/ttl fields from above */
 252     }
 253
 254     /* Checksum display & verification code */
 255     packet_checksum = tvb_get_ntohs(tvb, offset);
 256
 257     data_length = tvb_reported_length(tvb);
 258
 259     /* CDP doesn't adhere to RFC 1071 section 2. (B). It incorrectly assumes
 260      * checksums are calculated on a big endian platform, therefore i.s.o.
 261      * padding odd sized data with a zero byte _at the end_ it sets the last
 262      * big endian _word_ to contain the last network _octet_. This byteswap
 263      * has to be done on the last octet of network data before feeding it to
 264      * the Internet checksum routine.
 265      * CDP checksumming code has a bug in the addition of this last _word_
 266      * as a signed number into the long word intermediate checksum. When
 267      * reducing this long to word size checksum an off-by-one error can be
 268      * made. This off-by-one error is compensated for in the last _word_ of
 269      * the network data.
 270      */
 271     if (data_length & 1) {
 272         guint8 *padded_buffer;
 273         /* Allocate new buffer */
 274         padded_buffer = (guint8 *)wmem_alloc(wmem_packet_scope(), data_length+1);
 275         tvb_memcpy(tvb, padded_buffer, 0, data_length);
 276         /* Swap bytes in last word */
 277         padded_buffer[data_length] = padded_buffer[data_length-1];
 278         padded_buffer[data_length-1] = 0;
 279         /* Compensate off-by-one error */
 280         if (padded_buffer[data_length] & 0x80) {
 281           padded_buffer[data_length]--;
 282           padded_buffer[data_length-1]--;
 283         }
 284         /* Setup checksum routine data buffer */
 285         cksum_vec[0].ptr = padded_buffer;
 286         cksum_vec[0].len = data_length+1;
 287     } else {
 288         /* Setup checksum routine data buffer */
 289         cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, data_length);
 290         cksum_vec[0].len = data_length;
 291     }
 292
 293     computed_checksum = in_cksum(cksum_vec, 1);
 294     checksum_good = (computed_checksum == 0);
 295     checksum_bad = !checksum_good;
 296     if (checksum_good) {
 297         checksum_item = proto_tree_add_uint_format_value(cdp_tree,
 298                                                    hf_cdp_checksum, tvb, offset, 2, packet_checksum,
 299                                                    "0x%04x [correct]", packet_checksum);
 300     } else {
 301         checksum_item = proto_tree_add_uint_format_value(cdp_tree,
 302                                                    hf_cdp_checksum, tvb, offset, 2, packet_checksum,
 303                                                    "0x%04x [incorrect, should be 0x%04x]",
 304                                                    packet_checksum,
 305                                                    in_cksum_shouldbe(packet_checksum, computed_checksum));
 306     }
 307
 308     checksum_tree = proto_item_add_subtree(checksum_item, ett_cdp_checksum);
 309     checksum_item = proto_tree_add_boolean(checksum_tree, hf_cdp_checksum_good,
 310                                            tvb, offset, 2, checksum_good);
 311     PROTO_ITEM_SET_GENERATED(checksum_item);
 312     checksum_item = proto_tree_add_boolean(checksum_tree, hf_cdp_checksum_bad,
 313                                            tvb, offset, 2, checksum_bad);
 314     PROTO_ITEM_SET_GENERATED(checksum_item);
 315
 316     offset += 2;
 317
 318     while (tvb_reported_length_remaining(tvb, offset) != 0) {
 319         type = tvb_get_ntohs(tvb, offset + TLV_TYPE);
 320         length = tvb_get_ntohs(tvb, offset + TLV_LENGTH);
 321         if (length < 4) {
 322             if (tree) {
 323                 tlvi = proto_tree_add_text(cdp_tree, tvb, offset, 4,
 324                                            "TLV with invalid length %u (< 4)",
 325                                            length);
 326                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 327                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 328                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 329             }
 330             offset += 4;
 331             break;
 332         }
 333
 334         switch (type) {
 335
 336         case TYPE_DEVICE_ID:
 337             /* Device ID */
 338
 339             col_append_fstr(pinfo->cinfo, COL_INFO,
 340                             "Device ID: %s  ",
 341                             tvb_format_stringzpad(tvb, offset + 4, length - 4));
 342
 343             if (tree) {
 344                 tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
 345                                            length, "Device ID: %s",
 346                                            tvb_format_stringzpad(tvb, offset + 4, length - 4));
 347                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 348                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 349                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 350                 proto_tree_add_item(tlv_tree, hf_cdp_deviceid, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
 351             }
 352             offset += length;
 353             break;
 354
 355         case TYPE_PORT_ID:
 356             real_length = length;
 357             if (tvb_get_guint8(tvb, offset + real_length) != 0x00) {
 358                 /* The length in the TLV doesn't appear to be the
 359                    length of the TLV, as the byte just past it
 360                    isn't the first byte of a 2-byte big-endian
 361                    small integer; make the length of the TLV the length
 362                    in the TLV, plus 4 bytes for the TLV type and length,
 363                    minus 1 because that's what makes one capture work. */
 364                 real_length = length + 3;
 365             }
 366
 367             col_append_fstr(pinfo->cinfo, COL_INFO,
 368                             "Port ID: %s  ",
 369                             tvb_format_stringzpad(tvb, offset + 4,
 370                                                   length - 4));
 371
 372             if (tree) {
 373                 tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
 374                                            real_length, "Port ID: %s",
 375                                            tvb_format_text(tvb, offset + 4, real_length - 4));
 376                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 377                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 378                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 379                 proto_tree_add_item(tlv_tree, hf_cdp_portid, tvb, offset + 4, real_length - 4, ENC_ASCII|ENC_NA);
 380             }
 381             offset += real_length;
 382             break;
 383
 384         case TYPE_ADDRESS:
 385             /* Addresses */
 386             if (tree) {
 387                 tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
 388                                            length, "Addresses");
 389                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 390                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 391                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 392             }
 393             offset += 4;
 394             length -= 4;
 395             naddresses = tvb_get_ntohl(tvb, offset);
 396             if (tree) {
 397                 proto_tree_add_text(tlv_tree, tvb, offset, 4,
 398                                     "Number of addresses: %u", naddresses);
 399             }
 400             offset += 4;
 401             length -= 4;
 402             while (naddresses != 0) {
 403                 addr_length = dissect_address_tlv(tvb, offset, length,
 404                                                   tlv_tree);
 405                 if (addr_length < 0)
 406                     break;
 407                 offset += addr_length;
 408                 length -= addr_length;
 409
 410                 naddresses--;
 411             }
 412             offset += length;
 413             break;
 414
 415         case TYPE_CAPABILITIES:
 416             if (tree) {
 417                 tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
 418                                            length, "Capabilities");
 419                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 420                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 421                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 422             }
 423             offset += 4;
 424             length -= 4;
 425             dissect_capabilities(tvb, offset, length, tlv_tree);
 426             offset += length;
 427             break;
 428
 429         case TYPE_IOS_VERSION:
 430             if (tree) {
 431                 tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
 432                                            length, "Software Version");
 433                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 434                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 435                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 436                 add_multi_line_string_to_tree(tlv_tree, tvb, offset + 4,
 437                                               length - 4, "Software Version: ");
 438             }
 439             offset += length;
 440             break;
 441
 442         case TYPE_PLATFORM:
 443             /* ??? platform */
 444             if (tree) {
 445                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 446                                            offset, length, "Platform: %s",
 447                                            tvb_format_text(tvb, offset + 4, length - 4));
 448                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 449                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 450                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 451                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
 452             }
 453             offset += length;
 454             break;
 455
 456         case TYPE_IP_PREFIX:
 457             if (length == 8) {
 458                 /* if length is 8 then this is default gw not prefix */
 459                 if (tree) {
 460                     tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
 461                                                length, "ODR Default gateway: %s",
 462                                                tvb_ip_to_str(tvb, offset+4));
 463                     tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 464                     proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 465                     proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 466                     proto_tree_add_text(tlv_tree, tvb, offset+4, 4,
 467                                         "ODR Default gateway = %s",
 468                                         tvb_ip_to_str(tvb, offset+4));
 469                 }
 470                 offset += 8;
 471             } else {
 472                 if (tree) {
 473                     tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
 474                                                length, "IP Prefixes: %d",length/5);
 475
 476                     /* the actual number of prefixes is (length-4)/5
 477                        but if the variable is not a "float" but "integer"
 478                        then length/5=(length-4)/5  :)  */
 479
 480                     tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 481                     proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 482                     proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 483                 }
 484                 offset += 4;
 485                 length -= 4;
 486                 while (length > 0) {
 487                     if (tree) {
 488                         proto_tree_add_text(tlv_tree, tvb, offset, 5,
 489                                             "IP Prefix = %s/%u",
 490                                             tvb_ip_to_str(tvb, offset),
 491                                             tvb_get_guint8(tvb,offset+4));
 492                     }
 493                     offset += 5;
 494                     length -= 5;
 495                 }
 496             }
 497             break;
 498
 499         case TYPE_PROTOCOL_HELLO:
 500             if (tree) {
 501                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 502                                            offset,length, "Protocol Hello: %s",
 503                                            val_to_str(tvb_get_ntohs(tvb, offset+7), type_hello_vals, "Unknown (0x%04x)"));
 504                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 505                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 506                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 507                 proto_tree_add_text(tlv_tree, tvb, offset+4, 3,
 508                                     "OUI: 0x%06X (%s)",
 509                                     tvb_get_ntoh24(tvb,offset+4),
 510                                     val_to_str_const(tvb_get_ntoh24(tvb,offset+4), oui_vals, "Unknown"));
 511                 proto_tree_add_text(tlv_tree, tvb, offset+7, 2,
 512                                     "Protocol ID: 0x%04X (%s)",
 513                                     tvb_get_ntohs(tvb, offset+7),
 514                                     val_to_str_const(tvb_get_ntohs(tvb, offset+7), type_hello_vals, "Unknown"));
 515
 516                 switch(tvb_get_ntohs(tvb, offset+7)) {
 517
 518                 case TYPE_HELLO_CLUSTER_MGMT:
 519                     /*          proto_tree_add_text(tlv_tree, tvb, offset+9,
 520                                 length - 9, "Cluster Management");
 521                     */
 522                     ip_addr = tvb_get_ipv4(tvb, offset+9);
 523                     proto_tree_add_text(tlv_tree, tvb, offset+9, 4,
 524                                         "Cluster Master IP: %s",ip_to_str((guint8 *)&ip_addr));
 525                     ip_addr = tvb_get_ipv4(tvb, offset+13);
 526                     proto_tree_add_text(tlv_tree, tvb, offset+13, 4,
 527                                         "UNKNOWN (IP?): 0x%08X (%s)",
 528                                         ip_addr, ip_to_str((guint8 *)&ip_addr));
 529                     proto_tree_add_text(tlv_tree, tvb, offset+17, 1,
 530                                         "Version?: 0x%02X",
 531                                         tvb_get_guint8(tvb, offset+17));
 532                     proto_tree_add_text(tlv_tree, tvb, offset+18, 1,
 533                                         "Sub Version?: 0x%02X",
 534                                         tvb_get_guint8(tvb, offset+18));
 535                     proto_tree_add_text(tlv_tree, tvb, offset+19, 1,
 536                                         "Status?: 0x%02X",
 537                                         tvb_get_guint8(tvb, offset+19));
 538                     proto_tree_add_text(tlv_tree, tvb, offset+20, 1,
 539                                         "UNKNOWN: 0x%02X",
 540                                         tvb_get_guint8(tvb, offset+20));
 541                     proto_tree_add_text(tlv_tree, tvb, offset+21, 6,
 542                                         "Cluster Commander MAC: %s",
 543                                         tvb_ether_to_str(tvb, offset+21));
 544                     proto_tree_add_text(tlv_tree, tvb, offset+27, 6,
 545                                         "Switch's MAC: %s",
 546                                         tvb_ether_to_str(tvb, offset+27));
 547                     proto_tree_add_text(tlv_tree, tvb, offset+33, 1,
 548                                         "UNKNOWN: 0x%02X",
 549                                         tvb_get_guint8(tvb, offset+33));
 550                     proto_tree_add_text(tlv_tree, tvb, offset+34, 2,
 551                                         "Management VLAN: %d",
 552                                         tvb_get_ntohs(tvb, offset+34));
 553                     break;
 554                 default:
 555                     proto_tree_add_text(tlv_tree, tvb, offset + 9,
 556                                         length - 9, "Unknown");
 557                     break;
 558                 }
 559             }
 560             offset += length;
 561             break;
 562
 563         case TYPE_VTP_MGMT_DOMAIN:
 564             if (tree) {
 565                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 566                                            offset, length, "VTP Management Domain: %s",
 567                                            tvb_format_text(tvb, offset + 4, length - 4));
 568                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 569                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 570                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 571                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 572                                     length - 4, "VTP Management Domain: %s",
 573                                     tvb_format_text(tvb, offset + 4, length - 4));
 574             }
 575             offset += length;
 576             break;
 577
 578         case TYPE_NATIVE_VLAN:
 579             if (tree) {
 580                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 581                                            offset, length, "Native VLAN: %u",
 582                                            tvb_get_ntohs(tvb, offset + 4));
 583                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 584                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 585                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 586                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 587                                     length - 4, "Native VLAN: %u",
 588                                     tvb_get_ntohs(tvb, offset + 4));
 589             }
 590             offset += length;
 591             break;
 592
 593         case TYPE_DUPLEX:
 594             if (tree) {
 595                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 596                                            offset, length, "Duplex: %s",
 597                                            tvb_get_guint8(tvb, offset + 4) ?
 598                                            "Full" : "Half" );
 599                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 600                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 601                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 602                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 603                                     length - 4, "Duplex: %s",
 604                                     tvb_get_guint8(tvb, offset + 4) ?
 605                                     "Full" : "Half" );
 606             }
 607             offset += length;
 608             break;
 609
 610         case TYPE_VOIP_VLAN_REPLY:
 611             if (tree) {
 612                 if (length >= 7) {
 613                     tlvi = proto_tree_add_text(cdp_tree, tvb, offset, length,
 614                                                "VoIP VLAN Reply: %u", tvb_get_ntohs(tvb, offset + 5));
 615                 } else {
 616                     /*
 617                      * XXX - what are these?  I've seen them in some captures;
 618                      * they have a length of 6, and run up to the end of
 619                      * the packet, so if we try to dissect it the same way
 620                      * we dissect the 7-byte ones, we report a malformed
 621                      * frame.
 622                      */
 623                     tlvi = proto_tree_add_text(cdp_tree, tvb,
 624                                                offset, length, "VoIP VLAN Reply");
 625                 }
 626                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 627                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 628                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 629                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 630                                     1, "Data");
 631                 if (length >= 7) {
 632                     proto_tree_add_text(tlv_tree, tvb, offset + 5,
 633                                         2, "Voice VLAN: %u",
 634                                         tvb_get_ntohs(tvb, offset + 5));
 635                 }
 636             }
 637             offset += length;
 638             break;
 639
 640         case TYPE_VOIP_VLAN_QUERY:
 641             if (tree) {
 642                 if (length >= 7) {
 643                     tlvi = proto_tree_add_text(cdp_tree, tvb,
 644                                                offset, length, "VoIP VLAN Query: %u", tvb_get_ntohs(tvb, offset + 5));
 645                 } else {
 646                     /*
 647                      * XXX - what are these?  I've seen them in some captures;
 648                      * they have a length of 6, and run up to the end of
 649                      * the packet, so if we try to dissect it the same way
 650                      * we dissect the 7-byte ones, we report a malformed
 651                      * frame.
 652                      */
 653                     tlvi = proto_tree_add_text(cdp_tree, tvb,
 654                                                offset, length, "VoIP VLAN Query");
 655                 }
 656                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 657                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 658                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 659                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 660                                     1, "Data");
 661                 if (length >= 7) {
 662                     proto_tree_add_text(tlv_tree, tvb, offset + 5,
 663                                         2, "Voice VLAN: %u",
 664                                         tvb_get_ntohs(tvb, offset + 5));
 665                 }
 666             }
 667             offset += length;
 668             break;
 669
 670         case TYPE_POWER:
 671             if (tree) {
 672                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 673                                            offset, length, "Power Consumption: %u mW",
 674                                            tvb_get_ntohs(tvb, offset + 4));
 675                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 676                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 677                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 678                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 679                                     length - 4, "Power Consumption: %u mW",
 680                                     tvb_get_ntohs(tvb, offset + 4));
 681             }
 682             offset += length;
 683             break;
 684
 685         case TYPE_MTU:
 686             if (tree) {
 687                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 688                                            offset, length, "MTU: %u",
 689                                            tvb_get_ntohl(tvb,offset + 4));
 690                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 691                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 692                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 693                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 694                                     length - 4, "MTU: %u",
 695                                     tvb_get_ntohl(tvb,offset + 4));
 696             }
 697             offset += length;
 698             break;
 699
 700         case TYPE_TRUST_BITMAP:
 701             if (tree) {
 702                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 703                                            offset, length, "Trust Bitmap: 0x%02X",
 704                                            tvb_get_guint8(tvb, offset + 4));
 705                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 706                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 707                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 708                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 709                                     length - 4, "Trust Bitmap: %02x",
 710                                     tvb_get_guint8(tvb, offset + 4));
 711             }
 712             offset += length;
 713             break;
 714
 715         case TYPE_UNTRUSTED_COS:
 716             if (tree) {
 717                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 718                                            offset, length, "Untrusted port CoS: 0x%02X",
 719                                            tvb_get_guint8(tvb, offset + 4));
 720                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 721                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 722                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 723                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 724                                     length - 4, "Untrusted port CoS: %02x",
 725                                     tvb_get_guint8(tvb, offset + 4));
 726             }
 727             offset += length;
 728             break;
 729
 730         case TYPE_SYSTEM_NAME:
 731             if (tree) {
 732                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 733                                            offset, length, "System Name: %s",
 734                                            tvb_format_text(tvb, offset + 4, length - 4));
 735                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 736                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 737                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 738                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 739                                     length - 4, "System Name: %s",
 740                                     tvb_format_text(tvb, offset + 4, length - 4));
 741             }
 742             offset += length;
 743             break;
 744
 745         case TYPE_SYSTEM_OID:
 746             if (tree) {
 747                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 748                                            offset, length, "System Object Identifier");
 749                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 750                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 751                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 752                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 753                                     length - 4, "System Object Identifier: %s",
 754                                     tvb_bytes_to_ep_str(tvb, offset + 4, length - 4));
 755             }
 756             offset += length;
 757             break;
 758
 759         case TYPE_MANAGEMENT_ADDR:
 760             if (tree) {
 761                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 762                                            offset, length, "Management Addresses");
 763                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 764                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 765                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 766             }
 767             offset += 4;
 768             length -= 4;
 769             naddresses = tvb_get_ntohl(tvb, offset);
 770             if (tree) {
 771                 proto_tree_add_text(tlv_tree, tvb, offset, 4,
 772                                     "Number of addresses: %u", naddresses);
 773             }
 774             offset += 4;
 775             length -= 4;
 776             while (naddresses != 0) {
 777                 addr_length = dissect_address_tlv(tvb, offset, length,
 778                                                   tlv_tree);
 779                 if (addr_length < 0)
 780                     break;
 781                 offset += addr_length;
 782                 length -= addr_length;
 783
 784                 naddresses--;
 785             }
 786             offset += length;
 787             break;
 788
 789         case TYPE_LOCATION:
 790             if (tree) {
 791                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 792                                            offset, length, "Location: %s",
 793                                            tvb_format_text(tvb, offset + 5, length - 5));
 794                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 795                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 796                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 797                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 798                                     1 , "UNKNOWN: 0x%02X",
 799                                     tvb_get_guint8(tvb, offset + 4));
 800                 proto_tree_add_text(tlv_tree, tvb, offset + 5,
 801                                     length - 5, "Location: %s",
 802                                     tvb_format_text(tvb, offset + 5, length - 5));
 803             }
 804             offset += length;
 805             break;
 806
 807         case TYPE_POWER_REQUESTED:
 808             if (tree) {
 809                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 810                                            offset, length, "Power Request: ");
 811                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 812                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 813                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 814                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 815                                     2, "Request-ID: %u",
 816                                     tvb_get_ntohs(tvb, offset + 4));
 817                 proto_tree_add_text(tlv_tree, tvb, offset + 6,
 818                                     2, "Management-ID: %u",
 819                                     tvb_get_ntohs(tvb, offset + 6));
 820             }
 821             power_req_len = (tvb_get_ntohs(tvb, offset + TLV_LENGTH)) - 8;
 822             /* Move offset to where the list of Power Request Values Exist */
 823             offset += 8;
 824             while(power_req_len) {
 825                 if (power_req_len > 4) {
 826                     power_req = tvb_get_ntohl(tvb, offset);
 827                     if (tree) {
 828                         proto_tree_add_text(tlv_tree, tvb, offset,
 829                                             4, "Power Requested: %u mW", power_req);
 830                         proto_item_append_text(tlvi, "%u mW, ", power_req);
 831                     }
 832                     power_req_len -= 4;
 833                     offset += 4;
 834                 } else {
 835                     if (power_req_len == 4) {
 836                         power_req = tvb_get_ntohl(tvb, offset);
 837                         if (tree) {
 838                             proto_tree_add_text(tlv_tree, tvb, offset,
 839                                                 4, "Power Requested: %u mW", power_req);
 840                             proto_item_append_text(tlvi, "%u mW", power_req);
 841                         }
 842                     }
 843                     offset += power_req_len;
 844                     break;
 845                 }
 846             }
 847             break;
 848
 849         case TYPE_POWER_AVAILABLE:
 850             if (tree) {
 851                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 852                                            offset, length, "Power Available: ");
 853                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 854                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 855                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 856                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 857                                     2, "Request-ID: %u",
 858                                     tvb_get_ntohs(tvb, offset + 4));
 859                 proto_tree_add_text(tlv_tree, tvb, offset + 6,
 860                                     2, "Management-ID: %u",
 861                                     tvb_get_ntohs(tvb, offset + 6));
 862             }
 863             power_avail_len = (tvb_get_ntohs(tvb, offset + TLV_LENGTH)) - 8;
 864             /* Move offset to where the list of Power Available Values Exist */
 865             offset += 8;
 866             while(power_avail_len) {
 867                 if (power_avail_len >= 4) {
 868                     power_avail = tvb_get_ntohl(tvb, offset);
 869                     if (tree) {
 870                         proto_tree_add_text(tlv_tree, tvb, offset,
 871                                             4, "Power Available: %u mW", power_avail);
 872                         proto_item_append_text(tlvi, "%u mW, ", power_avail);
 873                     }
 874                     power_avail_len -= 4;
 875                     offset += 4;
 876                 } else {
 877                     offset += power_avail_len;
 878                     break;
 879                 }
 880             }
 881             break;
 882
 883         case TYPE_NRGYZ:
 884             if (tree) {
 885                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 886                                            offset, length, "EnergyWise");
 887                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 888                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 889                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 890                 proto_tree_add_text(tlv_tree, tvb, offset + 4,
 891                                     20, "Encrypted Data");
 892                 proto_tree_add_text(tlv_tree, tvb, offset + 24,
 893                                     4, "Unknown (Seen Sequence?): %u",
 894                                     tvb_get_ntohl(tvb, offset + 24));
 895                 proto_tree_add_text(tlv_tree, tvb, offset + 28,
 896                                     4, "Sequence Number: %u",
 897                                     tvb_get_ntohl(tvb, offset + 28));
 898                 proto_tree_add_text(tlv_tree, tvb, offset + 32,
 899                                     16, "Model Number: %s",
 900                                     tvb_format_stringzpad(tvb, offset + 32, 16));
 901                 proto_tree_add_text(tlv_tree, tvb, offset + 48,
 902                                     2, "Unknown Pad: %x",
 903                                     tvb_get_ntohs(tvb, offset + 48));
 904                 proto_tree_add_text(tlv_tree, tvb, offset + 50,
 905                                     3, "Hardware Version ID: %s",
 906                                     tvb_format_stringzpad(tvb, offset + 50, 3));
 907                 proto_tree_add_text(tlv_tree, tvb, offset + 53,
 908                                     11, "System Serial Number: %s",
 909                                     tvb_format_stringzpad(tvb, offset + 53, 11));
 910                 proto_tree_add_text(tlv_tree, tvb, offset + 64,
 911                                     8, "Unknown Values");
 912                 proto_tree_add_text(tlv_tree, tvb, offset + 72,
 913                                     2, "Length of TLV table: %u",
 914                                     tvb_get_ntohs(tvb, offset + 72));
 915                 proto_tree_add_text(tlv_tree, tvb, offset + 74,
 916                                     2, "Number of TLVs in table: %u",
 917                                     tvb_get_ntohs(tvb, offset + 74));
 918 /*
 919   proto_tree_add_text(tlv_tree, tvb,
 920   offset + 76, length - 76,
 921   "EnergyWise TLV Table");
 922 */
 923                 dissect_nrgyz_tlv(tvb, offset + 76,
 924                                   tvb_get_ntohs(tvb, offset + 72),
 925                                   tvb_get_ntohs(tvb, offset + 74),
 926                                   tlv_tree);
 927
 928
 929             }
 930             offset += length;
 931             break;
 932
 933         case TYPE_SPARE_POE:
 934             if (tree) {
 935                 tlvi = proto_tree_add_text(cdp_tree, tvb, offset, length,
 936                                            "Spare Pair PoE");
 937                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 938
 939                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 940                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 941             }
 942             offset += 4;
 943             length -= 4;
 944             dissect_spare_poe_tlv(tvb, offset, length, tlv_tree);
 945             offset += length;
 946             break;
 947
 948         case TYPE_HP_BSSID:
 949             /* BSSID */
 950             if (tree) {
 951                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 952                                            offset, length, "BSSID: %s",
 953                                            tvb_format_text(tvb, offset + 4, length - 4));
 954                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 955                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 956                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 957                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
 958             }
 959             offset += length;
 960             break;
 961
 962         case TYPE_HP_SERIAL:
 963             /* Serial number */
 964             if (tree) {
 965                 tlvi = proto_tree_add_text(cdp_tree, tvb,
 966                                            offset, length, "Serial: %s",
 967                                            tvb_format_text(tvb, offset + 4, length - 4));
 968                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 969                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 970                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 971                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
 972             }
 973             offset += length;
 974             break;
 975
 976         case TYPE_HP_SSID:
 977             /* SSID */
 978             if (tree) {
 979                 if (length == 4) {
 980                     tlvi = proto_tree_add_text(cdp_tree, tvb,
 981                                                offset, length, "SSID: [Empty]");
 982                     tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 983                     proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 984                     proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 985                 } else {
 986                     tlvi = proto_tree_add_text(cdp_tree, tvb,
 987                                                offset, length, "SSID: %s",
 988                                                tvb_format_text(tvb, offset + 4, length - 4));
 989                     tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
 990                     proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
 991                     proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
 992                     proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
 993                 }
 994             }
 995             offset += length;
 996             break;
 997
 998         case TYPE_HP_RADIO1_CH:
 999             /* Radio1 channel */
1000             if (tree) {
1001                 tlvi = proto_tree_add_text(cdp_tree, tvb,
1002                                            offset, length, "Radio 1 channel: %s",
1003                                            tvb_format_text(tvb, offset + 4, length - 4));
1004                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
1005                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
1006                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
1007                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
1008             }
1009             offset += length;
1010             break;
1011
1012         case TYPE_HP_SNMP_PORT:
1013             /* SNMP listening UDP port */
1014             if (tree) {
1015                 tlvi = proto_tree_add_text(cdp_tree, tvb,
1016                                            offset, length, "SNMP port: %s",
1017                                            tvb_format_text(tvb, offset + 4, length - 4));
1018                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
1019                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
1020                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
1021                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
1022             }
1023             offset += length;
1024             break;
1025
1026         case TYPE_HP_MGMT_PORT:
1027             /* Web interface TCP port */
1028             if (tree) {
1029                 tlvi = proto_tree_add_text(cdp_tree, tvb,
1030                                            offset, length, "Web mgmt port: %s",
1031                                            tvb_format_text(tvb, offset + 4, length - 4));
1032                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
1033                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
1034                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
1035                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
1036             }
1037             offset += length;
1038             break;
1039
1040         case TYPE_HP_SOURCE_MAC:
1041             /* Sender MAC address for the AP, bouth wired and wireless */
1042             if (tree) {
1043                 tlvi = proto_tree_add_text(cdp_tree, tvb,
1044                                            offset, length, "Source MAC: %s",
1045                                            tvb_format_text(tvb, offset + 4, length - 4));
1046                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
1047                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
1048                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
1049                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
1050             }
1051             offset += length;
1052             break;
1053
1054         case TYPE_HP_RADIO2_CH:
1055             /* Radio2 channel */
1056             if (tree) {
1057                 tlvi = proto_tree_add_text(cdp_tree, tvb,
1058                                            offset, length, "Radio 2 channel: %s",
1059                                            tvb_format_text(tvb, offset + 4, length - 4));
1060                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
1061                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
1062                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
1063                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
1064             }
1065             offset += length;
1066             break;
1067
1068         case TYPE_HP_RADIO1_OMODE:
1069             /* Radio1 Operating mode */
1070             if (tree) {
1071                 tlvi = proto_tree_add_text(cdp_tree, tvb,
1072                                            offset, length, "Radio 1 operating mode: %s",
1073                                            tvb_format_text(tvb, offset + 4, length - 4));
1074                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
1075                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
1076                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
1077                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
1078             }
1079             offset += length;
1080             break;
1081
1082         case TYPE_HP_RADIO2_OMODE:
1083             /* Radio2 Operating mode */
1084             if (tree) {
1085                 tlvi = proto_tree_add_text(cdp_tree, tvb,
1086                                            offset, length, "Radio 2 operating mode: %s",
1087                                            tvb_format_text(tvb, offset + 4, length - 4));
1088                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
1089                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
1090                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
1091                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
1092             }
1093             offset += length;
1094             break;
1095
1096         case TYPE_HP_RADIO1_RMODE:
1097             /* Radio1 Radio mode */
1098             if (tree) {
1099                 tlvi = proto_tree_add_text(cdp_tree, tvb,
1100                                            offset, length, "Radio 1 radio mode: %s",
1101                                            tvb_format_text(tvb, offset + 4, length - 4));
1102                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
1103                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
1104                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
1105                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
1106             }
1107             offset += length;
1108             break;
1109
1110         case TYPE_HP_RADIO2_RMODE:
1111             /* Radio2 Radio mode */
1112             if (tree) {
1113                 tlvi = proto_tree_add_text(cdp_tree, tvb,
1114                                            offset, length, "Radio 2 radio mode: %s",
1115                                            tvb_format_text(tvb, offset + 4, length - 4));
1116                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
1117                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
1118                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
1119                 proto_tree_add_item(tlv_tree, hf_cdp_platform, tvb, offset + 4, length - 4, ENC_ASCII|ENC_NA);
1120             }
1121             offset += length;
1122             break;
1123
1124         default:
1125             if (tree) {
1126                 tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
1127                                            length, "Type: %s, length: %u",
1128                                            val_to_str(type, type_vals, "Unknown (0x%04x)"),
1129                                            length);
1130                 tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
1131                 proto_tree_add_item(tlv_tree, hf_cdp_tlvtype, tvb, offset + TLV_TYPE, 2, ENC_BIG_ENDIAN);
1132                 proto_tree_add_item(tlv_tree, hf_cdp_tlvlength, tvb, offset + TLV_LENGTH, 2, ENC_BIG_ENDIAN);
1133                 if (length > 4) {
1134                     proto_tree_add_text(tlv_tree, tvb, offset + 4,
1135                                         length - 4, "Data");
1136                 } else {
1137                     return;
1138                 }
1139             }
1140             offset += length;
1141         }
1142     }
1143     call_dissector(data_handle, tvb_new_subset_remaining(tvb, offset), pinfo, cdp_tree);
1144 }
1145
1146 #define PROTO_TYPE_NLPID       1
1147 #define PROTO_TYPE_IEEE_802_2  2
1148
1149 static const value_string proto_type_vals[] = {
1150     { PROTO_TYPE_NLPID,      "NLPID" },
1151     { PROTO_TYPE_IEEE_802_2, "802.2" },
1152     { 0,                     NULL }
1153 };
1154
1155 static int
1156 dissect_address_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree)
1157 {
1158     proto_item *ti;
1159     proto_tree *address_tree;
1160     guint8      protocol_type;
1161     guint8      protocol_length;
1162     int         nlpid;
1163     const char *protocol_str;
1164     guint16     address_length;
1165     const char *address_type_str;
1166     const char *address_str;
1167
1168     if (length < 1)
1169         return -1;
1170     ti = proto_tree_add_text(tree, tvb, offset, length, "Truncated address");
1171     address_tree = proto_item_add_subtree(ti, ett_cdp_address);
1172     protocol_type = tvb_get_guint8(tvb, offset);
1173     proto_tree_add_text(address_tree, tvb, offset, 1, "Protocol type: %s",
1174                         val_to_str(protocol_type, proto_type_vals, "Unknown (0x%02x)"));
1175     offset += 1;
1176     length -= 1;
1177
1178     if (length < 1)
1179         return -1;
1180     protocol_length = tvb_get_guint8(tvb, offset);
1181     proto_tree_add_text(address_tree, tvb, offset, 1, "Protocol length: %u",
1182                         protocol_length);
1183     offset += 1;
1184     length -= 1;
1185
1186     if (length < protocol_length) {
1187         if (length != 0) {
1188             proto_tree_add_text(address_tree, tvb, offset, length,
1189               "Protocol: %s (truncated)",
1190               tvb_bytes_to_ep_str(tvb, offset, length));
1191         }
1192         return -1;
1193     }
1194     protocol_str = NULL;
1195     if ((protocol_type == PROTO_TYPE_NLPID) && (protocol_length == 1)) {
1196         nlpid = tvb_get_guint8(tvb, offset);
1197         protocol_str = val_to_str(nlpid, nlpid_vals, "Unknown (0x%02x)");
1198     } else
1199         nlpid = -1;
1200     if (protocol_str == NULL)
1201         protocol_str = tvb_bytes_to_ep_str(tvb, offset, protocol_length);
1202     proto_tree_add_text(address_tree, tvb, offset, protocol_length,
1203                         "Protocol: %s", protocol_str);
1204     offset += protocol_length;
1205     length -= protocol_length;
1206
1207     if (length < 2)
1208         return -1;
1209     address_length = tvb_get_ntohs(tvb, offset);
1210     proto_tree_add_text(address_tree, tvb, offset, 2, "Address length: %u",
1211                         address_length);
1212     offset += 2;
1213     length -= 2;
1214
1215     if (length < address_length) {
1216         if (length != 0) {
1217             proto_tree_add_text(address_tree, tvb, offset, length,
1218               "Address: %s (truncated)",
1219               tvb_bytes_to_ep_str(tvb, offset, length));
1220         }
1221         return -1;
1222     }
1223     /* XXX - the Cisco document seems to be saying that, for 802.2-format
1224        protocol types, 0xAAAA03 0x000000 0x0800 is IPv6, but 0x0800 is
1225        the Ethernet protocol type for IPv4. */
1226     address_type_str = NULL;
1227     address_str = NULL;
1228     if ((protocol_type == PROTO_TYPE_NLPID) && (protocol_length == 1)) {
1229         switch (nlpid) {
1230
1231         /* XXX - dissect NLPID_ISO8473_CLNP as OSI CLNP address? */
1232
1233         case NLPID_IP:
1234             if (address_length == 4) {
1235                 /* The address is an IP address. */
1236                 address_type_str = "IP address";
1237                 address_str = tvb_ip_to_str(tvb, offset);
1238             }
1239             break;
1240         }
1241     }
1242     if (address_type_str == NULL)
1243         address_type_str = "Address";
1244     if (address_str == NULL) {
1245         address_str = tvb_bytes_to_ep_str(tvb, offset, address_length);
1246     }
1247     proto_item_set_text(ti, "%s: %s", address_type_str, address_str);
1248     proto_tree_add_text(address_tree, tvb, offset, address_length, "%s: %s",
1249       address_type_str, address_str);
1250     return 2 + protocol_length + 2 + address_length;
1251 }
1252
1253 static void
1254 dissect_capabilities(tvbuff_t *tvb, int offset, int length, proto_tree *tree)
1255 {
1256     proto_item *ti;
1257     proto_tree *capabilities_tree;
1258
1259     if (length < 4)
1260         return;
1261     ti = proto_tree_add_item(tree, hf_cdp_capabilities, tvb, offset, 4, ENC_BIG_ENDIAN);
1262     capabilities_tree = proto_item_add_subtree(ti, ett_cdp_capabilities);
1263     proto_tree_add_item(capabilities_tree, hf_cdp_capabilities_router, tvb, offset, 4, ENC_BIG_ENDIAN);
1264     proto_tree_add_item(capabilities_tree, hf_cdp_capabilities_trans_bridge, tvb, offset, 4, ENC_BIG_ENDIAN);
1265     proto_tree_add_item(capabilities_tree, hf_cdp_capabilities_src_bridge, tvb, offset, 4, ENC_BIG_ENDIAN);
1266     proto_tree_add_item(capabilities_tree, hf_cdp_capabilities_switch, tvb, offset, 4, ENC_BIG_ENDIAN);
1267     proto_tree_add_item(capabilities_tree, hf_cdp_capabilities_host, tvb, offset, 4, ENC_BIG_ENDIAN);
1268     proto_tree_add_item(capabilities_tree, hf_cdp_capabilities_igmp_capable, tvb, offset, 4, ENC_BIG_ENDIAN);
1269     proto_tree_add_item(capabilities_tree, hf_cdp_capabilities_repeater, tvb, offset, 4, ENC_BIG_ENDIAN);
1270 }
1271
1272 static void
1273 dissect_nrgyz_tlv(tvbuff_t *tvb, int offset, guint16 length, guint16 num,
1274                   proto_tree *tree)
1275 {
1276     guint32     tlvt, tlvl, ip_addr;
1277     proto_item *it    = NULL;
1278     proto_tree *etree = NULL;
1279     char const *ttext = NULL;
1280
1281     while (num-- && (length >= 8)) {
1282         tlvt = tvb_get_ntohl(tvb, offset);
1283         tlvl = tvb_get_ntohl(tvb, offset + 4);
1284
1285         if (length < tlvl)
1286             break;
1287         length -= tlvl;
1288
1289         if (tlvl < 8) {
1290             proto_tree_add_text(tree, tvb, offset, 8,
1291                                 "TLV with invalid length %u (< 8)",
1292                                 tlvl);
1293             offset += 8;
1294             break;
1295         }
1296         else {
1297             ttext = val_to_str(tlvt, type_nrgyz_vals, "Unknown (0x%04x)");
1298             switch (tlvt) {
1299             case TYPE_NRGYZ_ROLE:
1300             case TYPE_NRGYZ_DOMAIN:
1301             case TYPE_NRGYZ_NAME:
1302                 it = proto_tree_add_text(tree, tvb, offset,
1303                                          tlvl, "EnergyWise %s: %s", ttext,
1304                                          tvb_format_stringzpad(tvb, offset + 8, tlvl - 8)
1305                     );
1306                 break;
1307             case TYPE_NRGYZ_REPLYTO:
1308                 ip_addr = tvb_get_ipv4(tvb, offset + 12);
1309                 it = proto_tree_add_text(tree, tvb, offset,
1310                                          tlvl, "EnergyWise %s: %s port %u",
1311                                          ttext,
1312                                          ip_to_str((guint8 *)&ip_addr),
1313                                          tvb_get_ntohs(tvb, offset + 10)
1314                     );
1315                 break;
1316             default:
1317                 it = proto_tree_add_text(tree, tvb, offset,
1318                                          tlvl, "EnergyWise %s TLV", ttext);
1319             }
1320             etree = proto_item_add_subtree(it, ett_cdp_nrgyz_tlv);
1321             proto_tree_add_text(etree, tvb, offset, 4,
1322                                 "TLV Type: %x (%s)", tlvt, ttext);
1323             proto_tree_add_text(etree, tvb, offset + 4, 4,
1324                                 "TLV Length: %u", tlvl);
1325             switch (tlvt) {
1326             case TYPE_NRGYZ_ROLE:
1327             case TYPE_NRGYZ_DOMAIN:
1328             case TYPE_NRGYZ_NAME:
1329                 proto_tree_add_text(etree, tvb, offset + 8,
1330                                     tlvl - 8, "%s %s", ttext,
1331                                     tvb_format_stringzpad(tvb, offset + 8, tlvl - 8)
1332                     );
1333                 break;
1334             case TYPE_NRGYZ_REPLYTO:
1335                 ip_addr = tvb_get_ipv4(tvb, offset + 12);
1336                 proto_tree_add_text(etree, tvb, offset + 8, 2,
1337                                     "Unknown Field");
1338                 proto_tree_add_text(etree, tvb, offset + 10, 2,
1339                                     "Port %d",
1340                                     tvb_get_ntohs(tvb, offset + 10)
1341                     );
1342                 proto_tree_add_text(etree, tvb, offset + 12, 4,
1343                                     "IP Address %s",
1344                                     ip_to_str((guint8 *)&ip_addr)
1345                     );
1346                 proto_tree_add_text(etree, tvb, offset + 16, 2,
1347                                     "Unknown Field (Backup server Port?)");
1348                 proto_tree_add_text(etree, tvb, offset + 18, 4,
1349                                     "Unknown Field (Backup Server IP?)");
1350                 break;
1351             default:
1352                 if (tlvl > 8) {
1353                     proto_tree_add_text(etree, tvb, offset + 8,
1354                                         tlvl - 8, "Data");
1355                 }
1356             }
1357             offset += tlvl;
1358         }
1359     }
1360     if (length) {
1361         proto_tree_add_text(tree, tvb, offset, length,
1362                             "Invalid garbage at end");
1363     }
1364 }
1365
1366 static void
1367 dissect_spare_poe_tlv(tvbuff_t *tvb, int offset, int length,
1368                       proto_tree *tree)
1369 {
1370     proto_item *ti;
1371     proto_tree *tlv_tree;
1372
1373     if (length == 0) {
1374         return;
1375     }
1376
1377     ti = proto_tree_add_item(tree, hf_cdp_spare_poe_tlv, tvb, offset, 1, ENC_BIG_ENDIAN);
1378     tlv_tree = proto_item_add_subtree(ti, ett_cdp_spare_poe_tlv);
1379     proto_tree_add_item(tlv_tree, hf_cdp_spare_poe_tlv_poe, tvb, offset, 1, ENC_BIG_ENDIAN);
1380     proto_tree_add_item(tlv_tree, hf_cdp_spare_poe_tlv_spare_pair_arch, tvb, offset, 1, ENC_BIG_ENDIAN);
1381     proto_tree_add_item(tlv_tree, hf_cdp_spare_poe_tlv_req_spare_pair_poe, tvb, offset, 1, ENC_BIG_ENDIAN);
1382     proto_tree_add_item(tlv_tree, hf_cdp_spare_poe_tlv_pse_spare_pair_poe, tvb, offset, 1, ENC_BIG_ENDIAN);
1383 }
1384
1385 static void
1386 add_multi_line_string_to_tree(proto_tree *tree, tvbuff_t *tvb, gint start,
1387   gint len, const gchar *prefix)
1388 {
1389     int  prefix_len;
1390     int  i;
1391     char blanks[64+1];
1392     gint next;
1393     int  line_len;
1394     int  data_len;
1395
1396     prefix_len = (int)strlen(prefix);
1397     if (prefix_len > 64)
1398         prefix_len = 64;
1399     for (i = 0; i < prefix_len; i++)
1400         blanks[i] = ' ';
1401     blanks[i] = '\0';
1402     while (len > 0) {
1403         line_len = tvb_find_line_end(tvb, start, len, &next, FALSE);
1404         data_len = next - start;
1405         proto_tree_add_text(tree, tvb, start, data_len, "%s%s", prefix,
1406            tvb_format_stringzpad(tvb, start, line_len));
1407         start += data_len;
1408         len   -= data_len;
1409         prefix = blanks;
1410     }
1411 }
1412
1413 void
1414 proto_register_cdp(void)
1415 {
1416     static hf_register_info hf[] = {
1417         { &hf_cdp_version,
1418         { "Version",            "cdp.version",  FT_UINT8, BASE_DEC, NULL, 0x0,
1419           NULL, HFILL }},
1420
1421         { &hf_cdp_ttl,
1422         { "TTL",                "cdp.ttl", FT_UINT16, BASE_DEC, NULL, 0x0,
1423           NULL, HFILL }},
1424
1425         { &hf_cdp_checksum,
1426         { "Checksum",           "cdp.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
1427           NULL, HFILL }},
1428
1429         { &hf_cdp_checksum_good,
1430           { "Good",       "cdp.checksum_good", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
1431             "True: checksum matches packet content; False: doesn't match content or not checked", HFILL }},
1432
1433         { &hf_cdp_checksum_bad,
1434           { "Bad",       "cdp.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
1435             "True: checksum doesn't match packet content; False: matches content or not checked", HFILL }},
1436
1437         { &hf_cdp_tlvtype,
1438         { "Type",               "cdp.tlv.type", FT_UINT16, BASE_HEX, VALS(type_vals), 0x0,
1439           NULL, HFILL }},
1440
1441         { &hf_cdp_tlvlength,
1442         { "Length",             "cdp.tlv.len", FT_UINT16, BASE_DEC, NULL, 0x0,
1443           NULL, HFILL }},
1444
1445         { &hf_cdp_deviceid,
1446         {"Device ID", "cdp.deviceid", FT_STRING, BASE_NONE,
1447          NULL, 0, NULL, HFILL }},
1448
1449         { &hf_cdp_platform,
1450         {"Platform", "cdp.platform", FT_STRING, BASE_NONE,
1451          NULL, 0, NULL, HFILL }},
1452
1453         { &hf_cdp_portid,
1454         {"Sent through Interface", "cdp.portid", FT_STRING, BASE_NONE,
1455                 NULL, 0, NULL, HFILL }},
1456
1457         { &hf_cdp_capabilities,
1458         {"Capabilities", "cdp.capabilities", FT_UINT32, BASE_HEX,
1459                 NULL, 0, NULL, HFILL }},
1460
1461         { &hf_cdp_capabilities_router,
1462         {"Router", "cdp.capabilities.router", FT_BOOLEAN, 32,
1463                 TFS(&tfs_yes_no), 0x01, NULL, HFILL }},
1464
1465         { &hf_cdp_capabilities_trans_bridge,
1466         {"Transparent Bridge", "cdp.capabilities.trans_bridge", FT_BOOLEAN, 32,
1467                 TFS(&tfs_yes_no), 0x02, NULL, HFILL }},
1468
1469         { &hf_cdp_capabilities_src_bridge,
1470         {"Source Route Bridge", "cdp.capabilities.src_bridge", FT_BOOLEAN, 32,
1471                 TFS(&tfs_yes_no), 0x04, NULL, HFILL }},
1472
1473         { &hf_cdp_capabilities_switch,
1474         {"Switch", "cdp.capabilities.switch", FT_BOOLEAN, 32,
1475                 TFS(&tfs_yes_no), 0x08, NULL, HFILL }},
1476
1477         { &hf_cdp_capabilities_host,
1478         {"Host", "cdp.capabilities.host", FT_BOOLEAN, 32,
1479                 TFS(&tfs_yes_no), 0x10, NULL, HFILL }},
1480
1481         { &hf_cdp_capabilities_igmp_capable,
1482         {"IGMP capable", "cdp.capabilities.igmp_capable", FT_BOOLEAN, 32,
1483                 TFS(&tfs_yes_no), 0x20, NULL, HFILL }},
1484
1485         { &hf_cdp_capabilities_repeater,
1486         {"Repeater", "cdp.capabilities.repeater", FT_BOOLEAN, 32,
1487                 TFS(&tfs_yes_no), 0x40, NULL, HFILL }},
1488
1489         { &hf_cdp_spare_poe_tlv,
1490         { "Spare Pair PoE", "cdp.spare_poe_tlv", FT_UINT8, BASE_HEX,
1491                 NULL, 0x0, NULL, HFILL }
1492         },
1493
1494         { &hf_cdp_spare_poe_tlv_poe,
1495         { "PSE Four-Wire PoE", "cdp.spare_poe_tlv.poe", FT_BOOLEAN, 8,
1496                 TFS(&tfs_supported_not_supported), 0x01, NULL, HFILL }
1497         },
1498
1499         { &hf_cdp_spare_poe_tlv_spare_pair_arch,
1500         { "PD Spare Pair Architecture", "cdp.spare_poe_tlv.spare_pair_arch", FT_BOOLEAN, 8,
1501                 TFS(&tfs_shared_independent), 0x02, NULL, HFILL }
1502         },
1503
1504         { &hf_cdp_spare_poe_tlv_req_spare_pair_poe,
1505         { "PD Request Spare Pair PoE", "cdp.spare_poe_tlv.req_spare_pair_poe", FT_BOOLEAN, 8,
1506                 TFS(&tfs_on_off), 0x04, NULL, HFILL }
1507         },
1508
1509         { &hf_cdp_spare_poe_tlv_pse_spare_pair_poe,
1510         { "PSE Spare Pair PoE", "cdp.spare_poe_tlv.pse_spare_pair_poe", FT_BOOLEAN, 8,
1511                 TFS(&tfs_on_off), 0x08, NULL, HFILL }
1512         },
1513     };
1514
1515     static gint *ett[] = {
1516         &ett_cdp,
1517         &ett_cdp_tlv,
1518         &ett_cdp_nrgyz_tlv,
1519         &ett_cdp_address,
1520         &ett_cdp_capabilities,
1521         &ett_cdp_checksum,
1522         &ett_cdp_spare_poe_tlv
1523     };
1524
1525     proto_cdp = proto_register_protocol("Cisco Discovery Protocol",
1526                                         "CDP", "cdp");
1527     proto_register_field_array(proto_cdp, hf, array_length(hf));
1528     proto_register_subtree_array(ett, array_length(ett));
1529 }
1530
1531 void
1532 proto_reg_handoff_cdp(void)
1533 {
1534     dissector_handle_t cdp_handle;
1535
1536     data_handle = find_dissector("data");
1537     cdp_handle  = create_dissector_handle(dissect_cdp, proto_cdp);
1538     dissector_add_uint("llc.cisco_pid", 0x2000, cdp_handle);
1539     dissector_add_uint("chdlc.protocol", 0x2000, cdp_handle);
1540     dissector_add_uint("ppp.protocol",  0x0207, cdp_handle);
1541 }