forked from osmocom/wireshark
109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
/* packet-maccontrol.c
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* Routines for MAC Control ethernet header disassembly
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*
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* $Id$
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include "packet-ieee8023.h"
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#include "packet-llc.h"
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#include <epan/etypes.h>
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static int proto_macctrl = -1;
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static gint ett_macctrl = -1;
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static int hf_macctrl_opcode = -1;
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static int hf_macctrl_pause_time = -1;
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#define MACCTRL_PAUSE 0x0001
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static const value_string opcode_vals[] = {
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{ MACCTRL_PAUSE, "Pause" },
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{ 0, NULL }
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};
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static void
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dissect_macctrl(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *ti;
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proto_tree *macctrl_tree = NULL;
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guint16 opcode;
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guint16 pause_time;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CTRL");
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col_clear(pinfo->cinfo, COL_INFO);
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opcode = tvb_get_ntohs(tvb, 0);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_macctrl, tvb, 0, 4, FALSE);
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macctrl_tree = proto_item_add_subtree(ti, ett_macctrl);
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proto_tree_add_uint(macctrl_tree, hf_macctrl_opcode, tvb, 0, 2, opcode);
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}
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switch (opcode) {
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case MACCTRL_PAUSE:
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pause_time = tvb_get_ntohs(tvb, 2);
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col_add_fstr(pinfo->cinfo, COL_INFO, "MAC PAUSE: pause_time %u quanta",
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pause_time);
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if (tree)
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proto_tree_add_uint(macctrl_tree, hf_macctrl_pause_time, tvb, 2, 2,
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pause_time);
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break;
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}
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}
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void
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proto_register_macctrl(void)
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{
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static hf_register_info hf[] = {
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{ &hf_macctrl_opcode,
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{ "Opcode", "macctrl.opcode", FT_UINT16, BASE_HEX,
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VALS(opcode_vals), 0x0, "MAC Control opcode", HFILL}},
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{ &hf_macctrl_pause_time,
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{ "pause_time", "macctrl.pause_time", FT_UINT16, BASE_DEC,
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NULL, 0x0, "MAC control PAUSE frame pause_time", HFILL }}
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};
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static gint *ett[] = {
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&ett_macctrl,
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};
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proto_macctrl = proto_register_protocol("MAC Control", "MACC", "macc");
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proto_register_field_array(proto_macctrl, 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_macctrl(void)
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{
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dissector_handle_t macctrl_handle;
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macctrl_handle = create_dissector_handle(dissect_macctrl, proto_macctrl);
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dissector_add("ethertype", ETHERTYPE_MAC_CONTROL, macctrl_handle);
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}
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