/* packet-vtp.c * Routines for the disassembly of Cisco's VLAN Trunking Protocol * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "config.h" #include #include #include /* * See * * http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm * * for some information on VTP. * * It's incomplete, and it appears to be inaccurate in a number of places, * but it's all I could find.... */ static int proto_vtp = -1; static int hf_vtp_version = -1; static int hf_vtp_code = -1; static int hf_vtp_followers = -1; static int hf_vtp_md_len = -1; static int hf_vtp_md = -1; static int hf_vtp_conf_rev_num = -1; static int hf_vtp_upd_id = -1; static int hf_vtp_upd_ts = -1; static int hf_vtp_md5_digest = -1; static int hf_vtp_seq_num = -1; static int hf_vtp_start_value = -1; static int hf_vtp_vlan_info_len = -1; static int hf_vtp_vlan_status_vlan_susp = -1; static int hf_vtp_vlan_type = -1; static int hf_vtp_vlan_name_len = -1; static int hf_vtp_isl_vlan_id = -1; static int hf_vtp_mtu_size = -1; static int hf_vtp_802_10_index = -1; static int hf_vtp_vlan_name = -1; static int hf_vtp_vlan_tlvtype = -1; static int hf_vtp_vlan_tlvlength = -1; static gint hf_vtp_pruning_first_vid = -1; static gint hf_vtp_pruning_last_vid = -1; static gint hf_vtp_pruning_active_vid = -1; static gint ett_vtp = -1; static gint ett_vtp_vlan_info = -1; static gint ett_vtp_vlan_status = -1; static gint ett_vtp_tlv = -1; static gint ett_vtp_pruning = -1; static int dissect_vlan_info(tvbuff_t *tvb, int offset, proto_tree *tree); static void dissect_vlan_info_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree, proto_item *ti, guint8 type); #define SUMMARY_ADVERT 0x01 #define SUBSET_ADVERT 0x02 #define ADVERT_REQUEST 0x03 #define JOIN_MSG 0x04 static const value_string type_vals[] = { { SUMMARY_ADVERT, "Summary Advertisement" }, { SUBSET_ADVERT, "Subset Advertisement" }, { ADVERT_REQUEST, "Advertisement Request" }, { JOIN_MSG, "Join/Prune Message" }, { 0, NULL }, }; static void set_vtp_info_col(tvbuff_t *tvb, packet_info *pinfo) { switch (tvb_get_guint8(tvb, 1)) { case SUMMARY_ADVERT: col_add_fstr(pinfo->cinfo, COL_INFO, "Summary Advertisement, Revision: %u", tvb_get_ntohl(tvb, 36)); if (tvb_get_guint8(tvb, 2) > 0) { col_append_fstr(pinfo->cinfo, COL_INFO, ", Followers: %u", tvb_get_guint8(tvb, 2)); } break; case SUBSET_ADVERT: col_add_fstr(pinfo->cinfo, COL_INFO, "Subset Advertisement, Revision: %u, Seq: %u", tvb_get_ntohl(tvb, 36), tvb_get_guint8(tvb, 2)); break; case ADVERT_REQUEST: col_set_str(pinfo->cinfo, COL_INFO, "Advertisement Request"); break; case JOIN_MSG: col_set_str(pinfo->cinfo, COL_INFO, "Join"); break; default: col_set_str(pinfo->cinfo, COL_INFO, "Unrecognized VTP message"); break; } } static void dissect_vtp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_item *ti; proto_tree *vtp_tree = NULL, *vtp_pruning_tree = NULL; int offset = 0; guint8 code; guint8 md_len; const guint8 *upd_timestamp; int vlan_info_len; int pruning_vlan_id; col_set_str(pinfo->cinfo, COL_PROTOCOL, "VTP"); set_vtp_info_col(tvb, pinfo); if (tree) { ti = proto_tree_add_item(tree, proto_vtp, tvb, offset, -1, ENC_NA); vtp_tree = proto_item_add_subtree(ti, ett_vtp); proto_tree_add_item(vtp_tree, hf_vtp_version, tvb, offset, 1, ENC_BIG_ENDIAN); offset += 1; code = tvb_get_guint8(tvb, offset); proto_tree_add_uint(vtp_tree, hf_vtp_code, tvb, offset, 1, code); offset += 1; switch (code) { case SUMMARY_ADVERT: proto_tree_add_item(vtp_tree, hf_vtp_followers, tvb, offset, 1, ENC_BIG_ENDIAN); offset += 1; md_len = tvb_get_guint8(tvb, offset); proto_tree_add_uint(vtp_tree, hf_vtp_md_len, tvb, offset, 1, md_len); offset += 1; proto_tree_add_item(vtp_tree, hf_vtp_md, tvb, offset, 32, ENC_ASCII|ENC_NA); offset += 32; proto_tree_add_item(vtp_tree, hf_vtp_conf_rev_num, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4; proto_tree_add_item(vtp_tree, hf_vtp_upd_id, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4; upd_timestamp = tvb_get_ptr(tvb, offset, 12); proto_tree_add_string_format(vtp_tree, hf_vtp_upd_ts, tvb, offset, 12, (gchar*)upd_timestamp, "Update Timestamp: %.2s-%.2s-%.2s %.2s:%.2s:%.2s", &upd_timestamp[0], &upd_timestamp[2], &upd_timestamp[4], &upd_timestamp[6], &upd_timestamp[8], &upd_timestamp[10]); offset += 12; proto_tree_add_item(vtp_tree, hf_vtp_md5_digest, tvb, offset, 16, ENC_NA); break; case SUBSET_ADVERT: proto_tree_add_item(vtp_tree, hf_vtp_seq_num, tvb, offset, 1, ENC_BIG_ENDIAN); offset += 1; md_len = tvb_get_guint8(tvb, offset); proto_tree_add_uint(vtp_tree, hf_vtp_md_len, tvb, offset, 1, md_len); offset += 1; proto_tree_add_item(vtp_tree, hf_vtp_md, tvb, offset, 32, ENC_ASCII|ENC_NA); offset += 32; proto_tree_add_item(vtp_tree, hf_vtp_conf_rev_num, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4; while (tvb_reported_length_remaining(tvb, offset) > 0) { vlan_info_len = dissect_vlan_info(tvb, offset, vtp_tree); if (vlan_info_len < 0) break; offset += vlan_info_len; } break; case ADVERT_REQUEST: offset += 1; /* skip reserved field */ md_len = tvb_get_guint8(tvb, offset); proto_tree_add_uint(vtp_tree, hf_vtp_md_len, tvb, offset, 1, md_len); offset += 1; proto_tree_add_item(vtp_tree, hf_vtp_md, tvb, offset, 32, ENC_ASCII|ENC_NA); offset += 32; proto_tree_add_item(vtp_tree, hf_vtp_start_value, tvb, offset, 2, ENC_BIG_ENDIAN); break; case JOIN_MSG: offset += 1; /* skip reserved/unused field */ md_len = tvb_get_guint8(tvb, offset); proto_tree_add_uint(vtp_tree, hf_vtp_md_len, tvb, offset, 1, md_len); offset += 1; proto_tree_add_item(vtp_tree, hf_vtp_md, tvb, offset, 32, ENC_ASCII|ENC_NA); offset += 32; proto_tree_add_item(vtp_tree, hf_vtp_pruning_first_vid, tvb, offset, 2, ENC_BIG_ENDIAN); pruning_vlan_id = tvb_get_ntohs(tvb, offset); offset += 2; proto_tree_add_item(vtp_tree, hf_vtp_pruning_last_vid, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; ti = proto_tree_add_text (vtp_tree, tvb, offset, -1, "Advertised active (i.e. not pruned) VLANs"); vtp_pruning_tree = proto_item_add_subtree(ti, ett_vtp_pruning); while (tvb_reported_length_remaining(tvb, offset) > 0) { guint8 vlan_usage_bitmap; int shift; vlan_usage_bitmap = tvb_get_guint8(tvb, offset); for (shift = 0; shift < 8; shift++) { if (vlan_usage_bitmap & (1<<7)) { proto_tree_add_uint(vtp_pruning_tree, hf_vtp_pruning_active_vid, tvb, offset, 1, pruning_vlan_id); } pruning_vlan_id += 1; vlan_usage_bitmap <<= 1; } offset += 1; } break; } } } #define VLAN_SUSPENDED 0x01 static const value_string vlan_type_vals[] = { { 0x01, "Ethernet" }, { 0x02, "FDDI" }, { 0x03, "TrCRF" }, { 0x04, "FDDI-net" }, { 0x05, "TrBRF" }, { 0, NULL }, }; #define SR_RING_NUM 0x01 #define SR_BRIDGE_NUM 0x02 #define STP_TYPE 0x03 #define PARENT_VLAN 0x04 #define TR_BRIDGED_VLANS 0x05 #define PRUNING 0x06 #define BRIDGE_TYPE 0x07 #define MAX_ARE_HOP_CNT 0x08 #define MAX_STE_HOP_CNT 0x09 #define BACKUP_CRF_MODE 0x0A static const value_string vlan_tlv_type_vals[] = { { SR_RING_NUM, "Source-Routing Ring Number" }, { SR_BRIDGE_NUM, "Source-Routing Bridge Number" }, { STP_TYPE, "Spanning-Tree Protocol Type" }, { PARENT_VLAN, "Parent VLAN" }, { TR_BRIDGED_VLANS, "Translationally Bridged VLANs" }, { PRUNING, "Pruning" }, { BRIDGE_TYPE, "Bridge Type" }, { MAX_ARE_HOP_CNT, "Max ARE Hop Count" }, { MAX_STE_HOP_CNT, "Max STE Hop Count" }, { BACKUP_CRF_MODE, "Backup CRF Mode" }, { 0, NULL }, }; static int dissect_vlan_info(tvbuff_t *tvb, int offset, proto_tree *tree) { proto_item *ti; proto_tree *vlan_info_tree; proto_tree *status_tree; guint8 vlan_info_len; int vlan_info_left; guint8 status; guint8 vlan_name_len; guint8 type; int length; proto_tree *tlv_tree; vlan_info_len = tvb_get_guint8(tvb, offset); ti = proto_tree_add_text(tree, tvb, offset, vlan_info_len, "VLAN Information"); vlan_info_tree = proto_item_add_subtree(ti, ett_vtp_vlan_info); vlan_info_left = vlan_info_len; proto_tree_add_uint(vlan_info_tree, hf_vtp_vlan_info_len, tvb, offset, 1, vlan_info_len); offset += 1; vlan_info_left -= 1; if (vlan_info_left < 1) return -1; status = tvb_get_guint8(tvb, offset); ti = proto_tree_add_text(vlan_info_tree, tvb, offset, 1, "Status: 0x%02x%s", status, (status & VLAN_SUSPENDED) ? "(VLAN suspended)" : ""); status_tree = proto_item_add_subtree(ti, ett_vtp_vlan_status); proto_tree_add_boolean(status_tree, hf_vtp_vlan_status_vlan_susp, tvb, offset, 1, status); offset += 1; vlan_info_left -= 1; if (vlan_info_left < 1) return -1; proto_tree_add_item(vlan_info_tree, hf_vtp_vlan_type, tvb, offset, 1, ENC_BIG_ENDIAN); offset += 1; vlan_info_left -= 1; if (vlan_info_left < 1) return -1; vlan_name_len = tvb_get_guint8(tvb, offset); proto_tree_add_uint(vlan_info_tree, hf_vtp_vlan_name_len, tvb, offset, 1, vlan_name_len); offset += 1; vlan_info_left -= 1; if (vlan_info_left < 2) return -1; proto_tree_add_item(vlan_info_tree, hf_vtp_isl_vlan_id, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; vlan_info_left -= 2; if (vlan_info_left < 2) return -1; proto_tree_add_item(vlan_info_tree, hf_vtp_mtu_size, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; vlan_info_left -= 2; if (vlan_info_left < 4) return -1; proto_tree_add_item(vlan_info_tree, hf_vtp_802_10_index, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4; vlan_info_left -= 4; /* VLAN name length appears to be rounded up to a multiple of 4. */ vlan_name_len = 4*((vlan_name_len + 3)/4); if (vlan_info_left < vlan_name_len) return -1; proto_tree_add_item(vlan_info_tree, hf_vtp_vlan_name, tvb, offset, vlan_name_len, ENC_ASCII|ENC_NA); offset += vlan_name_len; vlan_info_left -= vlan_name_len; while (vlan_info_left > 0) { type = tvb_get_guint8(tvb, offset + 0); length = tvb_get_guint8(tvb, offset + 1); ti = proto_tree_add_text(vlan_info_tree, tvb, offset, 2 + length*2, "%s", val_to_str(type, vlan_tlv_type_vals, "Unknown TLV type: 0x%02x")); tlv_tree = proto_item_add_subtree(ti, ett_vtp_tlv); proto_tree_add_uint(tlv_tree, hf_vtp_vlan_tlvtype, tvb, offset, 1, type); proto_tree_add_uint(tlv_tree, hf_vtp_vlan_tlvlength, tvb, offset+1, 1, length); offset += 2; vlan_info_left -= 2; if (length > 0) { dissect_vlan_info_tlv(tvb, offset, length*2, tlv_tree, ti, type); } offset += length*2; vlan_info_left -= length*2; } return vlan_info_len; } static const value_string stp_type_vals[] = { { 1, "SRT" }, { 2, "SRB" }, { 3, "Auto" }, { 0, NULL }, }; static const value_string pruning_vals[] = { { 1, "Enabled" }, { 2, "Disabled" }, { 0, NULL }, }; static const value_string bridge_type_vals[] = { { 1, "SRT" }, { 2, "SRB" }, { 0, NULL }, }; static const value_string backup_crf_mode_vals[] = { { 1, "TrCRF is configured as a backup" }, { 2, "TrCRF is not configured as a backup" }, { 0, NULL }, }; static void dissect_vlan_info_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree, proto_item *ti, guint8 type) { switch (type) { case SR_RING_NUM: if (length == 2) { proto_item_set_text(ti, "Source-Routing Ring Number: 0x%04x", tvb_get_ntohs(tvb, offset)); proto_tree_add_text(tree, tvb, offset, 2, "Source-Routing Ring Number: 0x%04x", tvb_get_ntohs(tvb, offset)); } else { proto_item_set_text(ti, "Source-Routing Ring Number: Bad length %u", length); proto_tree_add_text(tree, tvb, offset, length, "Source-Routing Ring Number: Bad length %u", length); } break; case SR_BRIDGE_NUM: if (length == 2) { proto_item_set_text(ti, "Source-Routing Bridge Number: 0x%04x", tvb_get_ntohs(tvb, offset)); proto_tree_add_text(tree, tvb, offset, 2, "Source-Routing Bridge Number: 0x%04x", tvb_get_ntohs(tvb, offset)); } else { proto_item_set_text(ti, "Source-Routing Bridge Number: Bad length %u", length); proto_tree_add_text(tree, tvb, offset, length, "Source-Routing Bridge Number: Bad length %u", length); } break; case STP_TYPE: if (length == 2) { proto_item_set_text(ti, "Spanning-Tree Protocol Type: %s", val_to_str(tvb_get_ntohs(tvb, offset), stp_type_vals, "Unknown (0x%04x)")); proto_tree_add_text(tree, tvb, offset, 2, "Spanning-Tree Protocol Type: %s", val_to_str(tvb_get_ntohs(tvb, offset), stp_type_vals, "Unknown (0x%04x)")); } else { proto_item_set_text(ti, "Spanning-Tree Protocol Type: Bad length %u", length); proto_tree_add_text(tree, tvb, offset, length, "Spanning-Tree Protocol Type: Bad length %u", length); } break; case PARENT_VLAN: if (length == 2) { proto_item_set_text(ti, "Parent VLAN: 0x%04x", tvb_get_ntohs(tvb, offset)); proto_tree_add_text(tree, tvb, offset, 2, "Parent VLAN: 0x%04x", tvb_get_ntohs(tvb, offset)); } else { proto_item_set_text(ti, "Parent VLAN: Bad length %u", length); proto_tree_add_text(tree, tvb, offset, length, "Parent VLAN: Bad length %u", length); } break; case TR_BRIDGED_VLANS: if (length == 2) { proto_item_set_text(ti, "Translationally Bridged VLANs: 0x%04x", tvb_get_ntohs(tvb, offset)); proto_tree_add_text(tree, tvb, offset, 2, "Translationally Bridged VLANs: 0x%04x", tvb_get_ntohs(tvb, offset)); } else { proto_item_set_text(ti, "Translationally Bridged VLANs: Bad length %u", length); proto_tree_add_text(tree, tvb, offset, length, "Translationally Bridged VLANs: Bad length %u", length); } break; case PRUNING: if (length == 2) { proto_item_set_text(ti, "Pruning: %s", val_to_str(tvb_get_ntohs(tvb, offset), pruning_vals, "Unknown (0x%04x)")); proto_tree_add_text(tree, tvb, offset, 2, "Pruning: %s", val_to_str(tvb_get_ntohs(tvb, offset), pruning_vals, "Unknown (0x%04x)")); } else { proto_item_set_text(ti, "Pruning: Bad length %u", length); proto_tree_add_text(tree, tvb, offset, length, "Pruning: Bad length %u", length); } break; case BRIDGE_TYPE: if (length == 2) { proto_item_set_text(ti, "Bridge Type: %s", val_to_str(tvb_get_ntohs(tvb, offset), bridge_type_vals, "Unknown (0x%04x)")); proto_tree_add_text(tree, tvb, offset, 2, "Bridge Type: %s", val_to_str(tvb_get_ntohs(tvb, offset), bridge_type_vals, "Unknown (0x%04x)")); } else { proto_item_set_text(ti, "Bridge Type: Bad length %u", length); proto_tree_add_text(tree, tvb, offset, length, "Bridge Type: Bad length %u", length); } break; case MAX_ARE_HOP_CNT: if (length == 2) { proto_item_set_text(ti, "Max ARE Hop Count: %u", tvb_get_ntohs(tvb, offset)); proto_tree_add_text(tree, tvb, offset, 2, "Max ARE Hop Count: %u", tvb_get_ntohs(tvb, offset)); } else { proto_item_set_text(ti, "Max ARE Hop Count: Bad length %u", length); proto_tree_add_text(tree, tvb, offset, length, "Max ARE Hop Count: Bad length %u", length); } break; case MAX_STE_HOP_CNT: if (length == 2) { proto_item_set_text(ti, "Max STE Hop Count: %u", tvb_get_ntohs(tvb, offset)); proto_tree_add_text(tree, tvb, offset, 2, "Max STE Hop Count: %u", tvb_get_ntohs(tvb, offset)); } else { proto_item_set_text(ti, "Max STE Hop Count: Bad length %u", length); proto_tree_add_text(tree, tvb, offset, length, "Max STE Hop Count: Bad length %u", length); } break; case BACKUP_CRF_MODE: if (length == 2) { proto_item_set_text(ti, "Backup CRF Mode: %s", val_to_str(tvb_get_ntohs(tvb, offset), backup_crf_mode_vals, "Unknown (0x%04x)")); proto_tree_add_text(tree, tvb, offset, 2, "Backup CRF Mode: %s", val_to_str(tvb_get_ntohs(tvb, offset), backup_crf_mode_vals, "Unknown (0x%04x)")); } else { proto_item_set_text(ti, "Backup CRF Mode: Bad length %u", length); proto_tree_add_text(tree, tvb, offset, length, "Backup CRF Mode: Bad length %u", length); } break; default: proto_tree_add_text(tree, tvb, offset, length, "Data"); break; } } void proto_register_vtp(void) { static hf_register_info hf[] = { { &hf_vtp_version, { "Version", "vtp.version", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_vtp_code, { "Code", "vtp.code", FT_UINT8, BASE_HEX, VALS(type_vals), 0x0, NULL, HFILL }}, { &hf_vtp_followers, { "Followers", "vtp.followers", FT_UINT8, BASE_DEC, NULL, 0x0, "Number of following Subset-Advert messages", HFILL }}, { &hf_vtp_md_len, { "Management Domain Length", "vtp.md_len", FT_UINT8, BASE_DEC, NULL, 0x0, "Length of management domain string", HFILL }}, { &hf_vtp_md, { "Management Domain", "vtp.md", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_vtp_conf_rev_num, { "Configuration Revision Number", "vtp.conf_rev_num", FT_UINT32, BASE_DEC, NULL, 0x0, "Revision number of the configuration information", HFILL }}, { &hf_vtp_upd_id, { "Updater Identity", "vtp.upd_id", FT_IPv4, BASE_NONE, NULL, 0x0, "IP address of the updater", HFILL }}, { &hf_vtp_upd_ts, { "Update Timestamp", "vtp.upd_ts", FT_STRING, BASE_NONE, NULL, 0, "Time stamp of the current configuration revision", HFILL }}, { &hf_vtp_md5_digest, { "MD5 Digest", "vtp.md5_digest", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_vtp_seq_num, { "Sequence Number", "vtp.seq_num", FT_UINT8, BASE_DEC, NULL, 0x0, "Order of this frame in the sequence of Subset-Advert frames", HFILL }}, { &hf_vtp_start_value, { "Start Value", "vtp.start_value", FT_UINT16, BASE_HEX, NULL, 0x0, "Virtual LAN ID of first VLAN for which information is requested", HFILL }}, { &hf_vtp_vlan_info_len, { "VLAN Information Length", "vtp.vlan_info.len", FT_UINT8, BASE_DEC, NULL, 0x0, "Length of the VLAN information field", HFILL }}, { &hf_vtp_vlan_status_vlan_susp, { "VLAN suspended", "vtp.vlan_info.status.vlan_susp", FT_BOOLEAN, 8, NULL, VLAN_SUSPENDED, NULL, HFILL }}, { &hf_vtp_vlan_type, { "VLAN Type", "vtp.vlan_info.vlan_type", FT_UINT8, BASE_HEX, VALS(vlan_type_vals), 0x0, "Type of VLAN", HFILL }}, { &hf_vtp_vlan_name_len, { "VLAN Name Length", "vtp.vlan_info.vlan_name_len", FT_UINT8, BASE_DEC, NULL, 0x0, "Length of VLAN name string", HFILL }}, { &hf_vtp_isl_vlan_id, { "ISL VLAN ID", "vtp.vlan_info.isl_vlan_id", FT_UINT16, BASE_HEX, NULL, 0x0, "ID of this VLAN on ISL trunks", HFILL }}, { &hf_vtp_mtu_size, { "MTU Size", "vtp.vlan_info.mtu_size", FT_UINT16, BASE_DEC, NULL, 0x0, "MTU for this VLAN", HFILL }}, { &hf_vtp_802_10_index, { "802.10 Index", "vtp.vlan_info.802_10_index", FT_UINT32, BASE_HEX, NULL, 0x0, "IEEE 802.10 security association identifier for this VLAN", HFILL }}, { &hf_vtp_vlan_name, { "VLAN Name", "vtp.vlan_info.vlan_name", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }}, { &hf_vtp_vlan_tlvtype, { "Type", "vtp.vlan_info.tlv_type", FT_UINT8, BASE_HEX, VALS(vlan_tlv_type_vals), 0x0, NULL, HFILL }}, { &hf_vtp_vlan_tlvlength, { "Length", "vtp.vlan_info.tlv_len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_vtp_pruning_first_vid, { "First VLAN ID", "vtp.pruning.first", FT_UINT16, BASE_DEC, NULL, 0x0, "First VLAN ID for which pruning information is present", HFILL }}, { &hf_vtp_pruning_last_vid, { "Last VLAN ID", "vtp.pruning.last", FT_UINT16, BASE_DEC, NULL, 0x0, "Last VLAN ID for which pruning information is present", HFILL }}, { &hf_vtp_pruning_active_vid, { "VLAN", "vtp.pruning.active", FT_UINT16, BASE_DEC, NULL, 0x0, "Active advertised VLAN ID", HFILL }}, }; static gint *ett[] = { &ett_vtp, &ett_vtp_vlan_info, &ett_vtp_vlan_status, &ett_vtp_tlv, &ett_vtp_pruning, }; proto_vtp = proto_register_protocol("VLAN Trunking Protocol", "VTP", "vtp"); proto_register_field_array(proto_vtp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_vtp(void) { dissector_handle_t vtp_handle; vtp_handle = create_dissector_handle(dissect_vtp, proto_vtp); dissector_add_uint("llc.cisco_pid", 0x2003, vtp_handle); }