2017-11-23 21:38:34 +00:00
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/* packet-mpls-mac.c
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*
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* Routines for MPLS Media Access Control (MAC) Address Withdrawal over Static Pseudowire.
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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2018-02-12 11:23:27 +00:00
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* SPDX-License-Identifier: GPL-2.0-or-later
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2017-11-23 21:38:34 +00:00
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include "packet-mpls.h"
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void proto_register_mpls_mac(void);
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void proto_reg_handoff_mpls_mac(void);
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static gint proto_mpls_mac = -1;
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static gint ett_mpls_mac = -1;
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static gint ett_mpls_mac_flags = -1;
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static gint ett_mpls_mac_tlv = -1;
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static int hf_mpls_mac_reserved = -1;
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static int hf_mpls_mac_tlv_length_total = -1;
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static int hf_mpls_mac_flags = -1;
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static int hf_mpls_mac_flags_a = -1;
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static int hf_mpls_mac_flags_r = -1;
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static int hf_mpls_mac_flags_reserved = -1;
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static int hf_mpls_mac_tlv = -1;
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static int hf_mpls_mac_tlv_res = -1;
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static int hf_mpls_mac_tlv_type = -1;
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static int hf_mpls_mac_tlv_length = -1;
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static int hf_mpls_mac_tlv_value = -1;
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static int hf_mpls_mac_tlv_sequence_number = -1;
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static const int *mpls_mac_flags[] = {
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&hf_mpls_mac_flags_a,
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&hf_mpls_mac_flags_r,
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&hf_mpls_mac_flags_reserved,
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NULL
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};
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static int
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dissect_mpls_mac(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *ti;
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proto_tree *mac_tree;
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guint32 offset = 0, tlv_length, offset_end;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MPLS-MAC");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_mpls_mac, tvb, 0, -1, ENC_NA);
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mac_tree = proto_item_add_subtree(ti, ett_mpls_mac);
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/* Reserved */
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proto_tree_add_item(mac_tree, hf_mpls_mac_reserved, tvb, offset, 2, ENC_NA);
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offset += 2;
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/* TLV length */
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proto_tree_add_item_ret_uint(mac_tree, hf_mpls_mac_tlv_length_total, tvb, offset, 1, ENC_BIG_ENDIAN, &tlv_length);
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offset += 1;
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/* Flags */
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proto_tree_add_bitmask(mac_tree, tvb, offset, hf_mpls_mac_flags,
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ett_mpls_mac_flags,
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mpls_mac_flags,
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ENC_BIG_ENDIAN);
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offset += 1;
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offset_end = offset + tlv_length;
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while(offset < offset_end){
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guint32 type, length;
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proto_tree *tlv_tree;
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ti = proto_tree_add_item(mac_tree, hf_mpls_mac_tlv, tvb, offset, 4, ENC_NA);
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tlv_tree = proto_item_add_subtree(ti, ett_mpls_mac_tlv);
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/* res(erved) */
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proto_tree_add_item(tlv_tree, hf_mpls_mac_tlv_res, tvb, offset, 2, ENC_BIG_ENDIAN);
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/* TLV Type */
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proto_tree_add_item_ret_uint(tlv_tree, hf_mpls_mac_tlv_type, tvb, offset, 2, ENC_BIG_ENDIAN, &type);
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offset += 2;
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/* TLV Length */
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proto_tree_add_item_ret_uint(tlv_tree, hf_mpls_mac_tlv_length, tvb, offset, 2, ENC_BIG_ENDIAN, &length);
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offset += 2;
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proto_item_set_len(ti, 2+2+length);
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proto_item_append_text(ti, " (t=0x%x, l=%u)", type, length);
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/* TLV Value */
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proto_tree_add_item(tlv_tree, hf_mpls_mac_tlv_value, tvb, offset, length, ENC_NA);
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switch(type){
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case 0x0001:
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proto_tree_add_item(tlv_tree, hf_mpls_mac_tlv_sequence_number, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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break;
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default:
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offset += length;
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break;
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}
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}
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return offset;
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}
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void
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proto_register_mpls_mac(void)
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{
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static hf_register_info hf[] = {
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{
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&hf_mpls_mac_reserved,
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{
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"Reserved", "mpls_mac.reserved",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_length_total,
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{
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"TLV Length (Total)", "mpls_mac.tlv_length_total",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_flags,
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{
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"Flags", "mpls_mac.flags",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_flags_a,
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{
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"Flags A", "mpls_mac.flags.a",
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FT_BOOLEAN, 8, NULL, 0x80,
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"set by a receiver to acknowledge receipt and processing of a MAC Address Withdraw OAM Message", HFILL
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}
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},
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{
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&hf_mpls_mac_flags_r,
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{
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"Flags R", "mpls_mac.flags.r",
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FT_BOOLEAN, 8, NULL, 0x40,
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"Set to indicate if the sender is requesting reset of the sequence numbers", HFILL
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}
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},
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{
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&hf_mpls_mac_flags_reserved,
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{
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"Flags Reserved", "mpls_mac.flags.reserved",
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FT_UINT8, BASE_HEX, NULL, 0x3F,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv,
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{
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"TLV", "mpls_mac.tlv",
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FT_NONE, BASE_NONE, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_res,
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{
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"Res(erved)", "mpls_mac.tlv.res",
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FT_UINT16, BASE_HEX, NULL, 0xC000,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_type,
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{
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"TLV Type", "mpls_mac.tlv.type",
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FT_UINT16, BASE_HEX, NULL, 0x3FFF,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_length,
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{
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"TLV Length", "mpls_mac.tlv.length",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_value,
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{
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"TLV Value", "mpls_mac.tlv.value",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL
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}
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},
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{
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&hf_mpls_mac_tlv_sequence_number,
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{
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"Sequence Number", "mpls_mac.tlv.sequence_number",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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};
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static gint *ett[] = {
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&ett_mpls_mac,
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&ett_mpls_mac_flags,
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&ett_mpls_mac_tlv,
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};
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proto_mpls_mac =
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proto_register_protocol("MPLS-MAC",
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"Media Access Control (MAC) Address Withdrawal over Static Pseudowire",
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"mpls_mac");
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proto_register_field_array(proto_mpls_mac, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_mpls_mac(void)
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{
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dissector_handle_t mpls_mac_handle;
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mpls_mac_handle = create_dissector_handle( dissect_mpls_mac, proto_mpls_mac );
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dissector_add_uint("pwach.channel_type", PW_ACH_TYPE_MAC, mpls_mac_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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