epan/dissectors/packet-maccontrol.c

   1 /* packet-maccontrol.c
   2  * Routines for MAC Control ethernet header disassembly
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 /*
  26  * 04/26/2010: WMeier: "Class-Based Flow Control [CBFC] Pause Frame"  dissection added
  27  *             See: http://www.ieee802.org/1/files/public/docs2007/new-cm-barrass-pause-proposal.pdf
  28  */
  29
  30 #include "config.h"
  31
  32 #include <glib.h>
  33 #include <epan/packet.h>
  34 #include "packet-llc.h"
  35 #include <epan/etypes.h>
  36
  37 static int proto_macctrl = -1;
  38
  39 static int hf_macctrl_opcode       = -1;
  40 static int hf_macctrl_pause_time   = -1;
  41 static int hf_macctrl_cbfc_enbv    = -1;
  42 static int hf_macctrl_cbfc_enbv_c0 = -1;
  43 static int hf_macctrl_cbfc_enbv_c1 = -1;
  44 static int hf_macctrl_cbfc_enbv_c2 = -1;
  45 static int hf_macctrl_cbfc_enbv_c3 = -1;
  46 static int hf_macctrl_cbfc_enbv_c4 = -1;
  47 static int hf_macctrl_cbfc_enbv_c5 = -1;
  48 static int hf_macctrl_cbfc_enbv_c6 = -1;
  49 static int hf_macctrl_cbfc_enbv_c7 = -1;
  50 static int hf_macctrl_cbfc_pause_time_c0 = -1;
  51 static int hf_macctrl_cbfc_pause_time_c1 = -1;
  52 static int hf_macctrl_cbfc_pause_time_c2 = -1;
  53 static int hf_macctrl_cbfc_pause_time_c3 = -1;
  54 static int hf_macctrl_cbfc_pause_time_c4 = -1;
  55 static int hf_macctrl_cbfc_pause_time_c5 = -1;
  56 static int hf_macctrl_cbfc_pause_time_c6 = -1;
  57 static int hf_macctrl_cbfc_pause_time_c7 = -1;
  58
  59 static gint ett_macctrl            = -1;
  60 static gint ett_macctrl_cbfc_enbv  = -1;
  61 static gint ett_macctrl_cbfc_pause_times = -1;
  62
  63 static const int *macctrl_cbfc_enbv_list[] = {
  64   &hf_macctrl_cbfc_enbv_c0,
  65   &hf_macctrl_cbfc_enbv_c1,
  66   &hf_macctrl_cbfc_enbv_c2,
  67   &hf_macctrl_cbfc_enbv_c3,
  68   &hf_macctrl_cbfc_enbv_c4,
  69   &hf_macctrl_cbfc_enbv_c5,
  70   &hf_macctrl_cbfc_enbv_c6,
  71   &hf_macctrl_cbfc_enbv_c7,
  72   NULL
  73 };
  74
  75 static const int *macctrl_cbfc_pause_times_list[] = {
  76   &hf_macctrl_cbfc_pause_time_c0,
  77   &hf_macctrl_cbfc_pause_time_c1,
  78   &hf_macctrl_cbfc_pause_time_c2,
  79   &hf_macctrl_cbfc_pause_time_c3,
  80   &hf_macctrl_cbfc_pause_time_c4,
  81   &hf_macctrl_cbfc_pause_time_c5,
  82   &hf_macctrl_cbfc_pause_time_c6,
  83   &hf_macctrl_cbfc_pause_time_c7
  84 };
  85
  86 #define MACCTRL_PAUSE                        0x0001
  87 #define MACCTRL_CLASS_BASED_FLOW_CNTRL_PAUSE 0x0101
  88
  89 static const value_string opcode_vals[] = {
  90   { MACCTRL_PAUSE, "Pause" },
  91   { MACCTRL_CLASS_BASED_FLOW_CNTRL_PAUSE, "Class Based Flow Control [CBFC] Pause" },
  92   { 0, NULL }
  93 };
  94
  95 static void
  96 dissect_macctrl(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  97 {
  98   proto_tree *ti;
  99   proto_tree *macctrl_tree = NULL;
 100   proto_tree *pause_times_tree = NULL;
 101   guint16     opcode;
 102   guint16     pause_time;
 103
 104   col_set_str(pinfo->cinfo, COL_PROTOCOL, "MAC CTRL");
 105   col_clear(pinfo->cinfo, COL_INFO);
 106
 107   opcode = tvb_get_ntohs(tvb, 0);
 108   if (tree) {
 109     ti = proto_tree_add_item(tree, proto_macctrl, tvb, 0, 46, ENC_NA);
 110     macctrl_tree = proto_item_add_subtree(ti, ett_macctrl);
 111
 112     proto_tree_add_uint(macctrl_tree, hf_macctrl_opcode, tvb, 0, 2, opcode);
 113   }
 114
 115   switch (opcode) {
 116
 117     case MACCTRL_PAUSE:
 118       pause_time = tvb_get_ntohs(tvb, 2);
 119       col_add_fstr(pinfo->cinfo, COL_INFO, "MAC PAUSE: pause_time: %u quanta",
 120                    pause_time);
 121       if (tree)
 122         proto_tree_add_uint(macctrl_tree, hf_macctrl_pause_time, tvb, 2, 2,
 123                             pause_time);
 124       break;
 125
 126     case MACCTRL_CLASS_BASED_FLOW_CNTRL_PAUSE:
 127       col_set_str(pinfo->cinfo, COL_INFO, "MAC CLASS BASED FLOW CONTROL PAUSE");
 128       if (tree) {
 129         int i;
 130         proto_tree_add_bitmask(macctrl_tree, tvb, 2, hf_macctrl_cbfc_enbv,
 131                                ett_macctrl_cbfc_enbv, macctrl_cbfc_enbv_list, ENC_BIG_ENDIAN);
 132
 133         ti = proto_tree_add_text(macctrl_tree, tvb, 4, 8*2, "CBFC Class Pause Times");
 134         pause_times_tree = proto_item_add_subtree(ti, ett_macctrl_cbfc_pause_times);
 135
 136         for (i=0; i<8; i++) {
 137           proto_tree_add_item(pause_times_tree, *macctrl_cbfc_pause_times_list[i], tvb, 4+i*2, 2, ENC_BIG_ENDIAN);
 138         }
 139       }
 140       break;
 141
 142   }
 143 }
 144
 145 void
 146 proto_register_macctrl(void)
 147 {
 148   static hf_register_info hf[] = {
 149     { &hf_macctrl_opcode,
 150       { "Opcode", "macc.opcode", FT_UINT16, BASE_HEX,
 151         VALS(opcode_vals), 0x0, "MAC Control opcode", HFILL}},
 152
 153     { &hf_macctrl_pause_time,
 154       { "pause_time", "macc.pause_time", FT_UINT16, BASE_DEC,
 155         NULL, 0x0, "MAC control PAUSE frame pause_time", HFILL }},
 156
 157     { &hf_macctrl_cbfc_enbv,
 158       { "CBFC Class Enable Vector", "macc.cbfc.enbv", FT_UINT16, BASE_HEX,
 159         NULL, 0x0, NULL, HFILL }},
 160
 161     { &hf_macctrl_cbfc_enbv_c0,
 162       { "C0", "macc.cbfc.enbv.c0", FT_BOOLEAN, 16,
 163         NULL, 0x01, NULL, HFILL }},
 164
 165     { &hf_macctrl_cbfc_enbv_c1,
 166       { "C1", "macc.cbfc.enbv.c1", FT_BOOLEAN, 16,
 167         NULL, 0x02, NULL, HFILL }},
 168
 169     { &hf_macctrl_cbfc_enbv_c2,
 170       { "C2", "macc.cbfc.enbv.c2", FT_BOOLEAN, 16,
 171         NULL, 0x04, NULL, HFILL }},
 172
 173     { &hf_macctrl_cbfc_enbv_c3,
 174       { "C3", "macc.cbfc.enbv.c3", FT_BOOLEAN, 16,
 175         NULL, 0x08, NULL, HFILL }},
 176
 177     { &hf_macctrl_cbfc_enbv_c4,
 178       { "C4", "macc.cbfc.enbv.c4", FT_BOOLEAN, 16,
 179         NULL, 0x10, NULL, HFILL }},
 180
 181     { &hf_macctrl_cbfc_enbv_c5,
 182       { "C5", "macc.cbfc.enbv.c5", FT_BOOLEAN, 16,
 183         NULL, 0x20, NULL, HFILL }},
 184
 185     { &hf_macctrl_cbfc_enbv_c6,
 186       { "C6", "macc.cbfc.enbv.c6", FT_BOOLEAN, 16,
 187         NULL, 0x40, NULL, HFILL }},
 188
 189     { &hf_macctrl_cbfc_enbv_c7,
 190       { "C7", "macc.cbfc.enbv.c7", FT_BOOLEAN, 16,
 191         NULL, 0x80, NULL, HFILL }},
 192
 193     { &hf_macctrl_cbfc_pause_time_c0,
 194       { "C0", "macc.cbfc.pause_time.c0", FT_UINT16, BASE_DEC,
 195         NULL, 0x00, NULL, HFILL }},
 196
 197     { &hf_macctrl_cbfc_pause_time_c1,
 198       { "C1", "macc.cbfc.pause_time.c1", FT_UINT16, BASE_DEC,
 199         NULL, 0x00, NULL, HFILL }},
 200
 201     { &hf_macctrl_cbfc_pause_time_c2,
 202       { "C2", "macc.cbfc.pause_time.c2", FT_UINT16, BASE_DEC,
 203         NULL, 0x00, NULL, HFILL }},
 204
 205     { &hf_macctrl_cbfc_pause_time_c3,
 206       { "C3", "macc.cbfc.pause_time.c3", FT_UINT16, BASE_DEC,
 207         NULL, 0x00, NULL, HFILL }},
 208
 209     { &hf_macctrl_cbfc_pause_time_c4,
 210       { "C4", "macc.cbfc.pause_time.c4", FT_UINT16, BASE_DEC,
 211         NULL, 0x00, NULL, HFILL }},
 212
 213     { &hf_macctrl_cbfc_pause_time_c5,
 214       { "C5", "macc.cbfc.pause_time.c5", FT_UINT16, BASE_DEC,
 215         NULL, 0x00, NULL, HFILL }},
 216
 217     { &hf_macctrl_cbfc_pause_time_c6,
 218       { "C6", "macc.cbfc.pause_time.c6", FT_UINT16, BASE_DEC,
 219         NULL, 0x00, NULL, HFILL }},
 220
 221     { &hf_macctrl_cbfc_pause_time_c7,
 222       { "C7", "macc.cbfc.pause_time.c7", FT_UINT16, BASE_DEC,
 223         NULL, 0x00, NULL, HFILL }}
 224
 225   };
 226
 227   static gint *ett[] = {
 228         &ett_macctrl,
 229         &ett_macctrl_cbfc_enbv,
 230         &ett_macctrl_cbfc_pause_times
 231   };
 232   proto_macctrl = proto_register_protocol("MAC Control", "MACC", "macc");
 233   proto_register_field_array(proto_macctrl, hf, array_length(hf));
 234   proto_register_subtree_array(ett, array_length(ett));
 235 }
 236
 237 void
 238 proto_reg_handoff_macctrl(void)
 239 {
 240   dissector_handle_t macctrl_handle;
 241
 242   macctrl_handle = create_dissector_handle(dissect_macctrl, proto_macctrl);
 243   dissector_add_uint("ethertype", ETHERTYPE_MAC_CONTROL, macctrl_handle);
 244 }