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/* packet-trmac.c
* Routines for Token-Ring Media Access Control
* Gilbert Ramirez <gram@alumni.rice.edu>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include "packet-frame.h"
static int proto_trmac = -1;
static int hf_trmac_mv = -1;
static int hf_trmac_length = -1;
static int hf_trmac_srcclass = -1;
static int hf_trmac_dstclass = -1;
static int hf_trmac_sv = -1;
static int hf_trmac_errors_iso = -1;
static int hf_trmac_errors_line = -1;
static int hf_trmac_errors_internal = -1;
static int hf_trmac_errors_burst = -1;
static int hf_trmac_errors_ac = -1;
static int hf_trmac_errors_abort = -1;
static int hf_trmac_errors_noniso = -1;
static int hf_trmac_errors_lost = -1;
static int hf_trmac_errors_congestion = -1;
static int hf_trmac_errors_fc = -1;
static int hf_trmac_errors_freq = -1;
static int hf_trmac_errors_token = -1;
static int hf_trmac_naun = -1;
static gint ett_tr_mac = -1;
static gint ett_tr_ierr_cnt = -1;
static gint ett_tr_nerr_cnt = -1;
/* Major Vector */
static const value_string major_vector_vs[] = {
{ 0x00, "Response" },
{ 0x02, "Beacon" },
{ 0x03, "Claim Token" },
{ 0x04, "Ring Purge" },
{ 0x05, "Active Monitor Present" },
{ 0x06, "Standby Monitor Present" },
{ 0x07, "Duplicate Address Test" },
{ 0x09, "Transmit Forward" },
{ 0x0B, "Remove Ring Station" },
{ 0x0C, "Change Parameters" },
{ 0x0D, "Initialize Ring Station" },
{ 0x0E, "Request Ring Station Address" },
{ 0x0F, "Request Ring Station Address" },
{ 0x10, "Request Ring Station Attachments" },
{ 0x20, "Request Initialization" },
{ 0x22, "Report Ring Station Address" },
{ 0x23, "Report Ring Station State" },
{ 0x24, "Report Ring Station Attachments" },
{ 0x25, "Report New Active Monitor" },
{ 0x26, "Report NAUN Change" },
{ 0x27, "Report Poll Error" },
{ 0x28, "Report Monitor Errors" },
{ 0x29, "Report Error" },
{ 0x2A, "Report Transmit Forward" },
{ 0x00, NULL }
};
/* Src. and Dest. Classes */
static const value_string classes_vs[] = {
{ 0x00, "Ring Station" },
{ 0x01, "LLC Manager" },
{ 0x04, "Configuration Report Server" },
{ 0x05, "Ring Parameter Server" },
{ 0x06, "Ring Error Monitor" },
{ 0x00, NULL }
};
/* Sub-vectors */
static int
sv_text(tvbuff_t *tvb, int svoff, proto_tree *tree)
{
int sv_length = tvb_get_guint8(tvb, svoff+0);
guint16 beacon_type, ring;
const char *beacon[] = {
"Recovery mode set", "Signal loss error",
"Streaming signal not Claim Token MAC frame",
"Streaming signal, Claim Token MAC frame"
};
proto_tree *sv_tree;
proto_item *ti, *hidden_item;
guchar errors[6]; /* isolating or non-isolating */
/* Check the SV length.
XXX - Should we do this in each case statement below, e.g. to force
an SV length of 6 for the NAUN address? */
if (sv_length < 1) {
proto_tree_add_protocol_format(tree, proto_malformed, tvb, svoff+0, 1,
"Invalid subvector length: %d bytes", sv_length);
return sv_length;
}
/* this just adds to the clutter on the screen...
proto_tree_add_text(tree, tvb, svoff, 1,
"Subvector Length: %d bytes", sv_length);*/
hidden_item = proto_tree_add_uint(tree, hf_trmac_sv, tvb, svoff+1, 1, tvb_get_guint8(tvb, svoff+1));
PROTO_ITEM_SET_HIDDEN(hidden_item);
switch(tvb_get_guint8(tvb, svoff+1)) {
case 0x01: /* Beacon Type */
beacon_type = tvb_get_ntohs(tvb, svoff+2);
if (beacon_type < array_length(beacon)) {
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Beacon Type: %s", beacon[beacon_type] );
} else {
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Beacon Type: Illegal value: %d", beacon_type );
}
break;
case 0x02: /* NAUN */
proto_tree_add_ether(tree, hf_trmac_naun, tvb, svoff+1, sv_length-1,
tvb_get_ptr(tvb, svoff+2, 6));
break;
case 0x03: /* Local Ring Number */
ring = tvb_get_ntohs(tvb, svoff+2);
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Local Ring Number: 0x%04X (%d)", ring, ring);
break;
case 0x04: /* Assign Physical Location */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Assign Physical Location: 0x%08X", tvb_get_ntohl(tvb, svoff+2) );
break;
case 0x05: /* Soft Error Report Value */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Soft Error Report Value: %d ms", 10 * tvb_get_ntohs(tvb, svoff+2) );
break;
case 0x06: /* Enabled Function Classes */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Enabled Function Classes: %04X", tvb_get_ntohs(tvb, svoff+2) );
break;
case 0x07: /* Allowed Access Priority */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Allowed Access Priority: %04X", tvb_get_ntohs(tvb, svoff+2) );
break;
case 0x09: /* Correlator */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Correlator: %04X", tvb_get_ntohs(tvb, svoff+2) );
break;
case 0x0A: /* Address of last neighbor notification */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Address of Last Neighbor Notification: %s",
ether_to_str(tvb_get_ptr(tvb, svoff+2, 6)));
break;
case 0x0B: /* Physical Location */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Physical Location: 0x%08X", tvb_get_ntohl(tvb, svoff+2) );
break;
case 0x20: /* Response Code */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Response Code: 0x%04X 0x%04X", tvb_get_ntohl(tvb, svoff+2),
tvb_get_ntohl(tvb, svoff+4) );
break;
case 0x21: /* Reserved */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Reserved: 0x%04X", tvb_get_ntohs(tvb, svoff+2) );
break;
case 0x22: /* Product Instance ID */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Product Instance ID: ...");
break;
case 0x23: /* Ring Station Microcode Level */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Ring Station Microcode Level: ...");
break;
case 0x26: /* Wrap data */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Wrap Data: ... (%d bytes)", sv_length - 2);
break;
case 0x27: /* Frame Forward */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Frame Forward: ... (%d bytes)", sv_length - 2);
break;
case 0x29: /* Ring Station Status Subvector */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Ring Station Status Subvector: ...");
break;
case 0x2A: /* Transmit Status Code */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Transmit Status Code: %04X", tvb_get_ntohs(tvb, svoff+2) );
break;
case 0x2B: /* Group Address */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Group Address: %08X", tvb_get_ntohl(tvb, svoff+2) );
break;
case 0x2C: /* Functional Address */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Functional Address: %08X", tvb_get_ntohl(tvb, svoff+2) );
break;
case 0x2D: /* Isolating Error Counts */
tvb_memcpy(tvb, errors, svoff+2, 6);
ti = proto_tree_add_uint(tree, hf_trmac_errors_iso, tvb, svoff+1, sv_length-1,
errors[0] + errors[1] + errors[2] + errors[3] + errors[4]);
sv_tree = proto_item_add_subtree(ti, ett_tr_ierr_cnt);
proto_tree_add_uint(sv_tree, hf_trmac_errors_line, tvb, svoff+2, 1, errors[0]);
proto_tree_add_uint(sv_tree, hf_trmac_errors_internal, tvb, svoff+3, 1, errors[1]);
proto_tree_add_uint(sv_tree, hf_trmac_errors_burst, tvb, svoff+4, 1, errors[2]);
proto_tree_add_uint(sv_tree, hf_trmac_errors_ac, tvb, svoff+5, 1, errors[3]);
proto_tree_add_uint(sv_tree, hf_trmac_errors_abort, tvb, svoff+6, 1, errors[4]);
break;
case 0x2E: /* Non-Isolating Error Counts */
tvb_memcpy(tvb, errors, svoff+2, 6);
ti = proto_tree_add_uint(tree, hf_trmac_errors_noniso, tvb, svoff+1, sv_length-1,
errors[0] + errors[1] + errors[2] + errors[3] + errors[4]);
sv_tree = proto_item_add_subtree(ti, ett_tr_nerr_cnt);
proto_tree_add_uint(sv_tree, hf_trmac_errors_lost, tvb, svoff+2, 1, errors[0]);
proto_tree_add_uint(sv_tree, hf_trmac_errors_congestion, tvb, svoff+3, 1, errors[1]);
proto_tree_add_uint(sv_tree, hf_trmac_errors_fc, tvb, svoff+4, 1, errors[2]);
proto_tree_add_uint(sv_tree, hf_trmac_errors_freq, tvb, svoff+5, 1, errors[3]);
proto_tree_add_uint(sv_tree, hf_trmac_errors_token, tvb, svoff+6, 1, errors[4]);
break;
case 0x30: /* Error Code */
proto_tree_add_text(tree, tvb, svoff+1, sv_length-1,
"Error Code: %04X", tvb_get_ntohs(tvb, svoff+2) );
break;
default: /* Unknown */
proto_tree_add_text(tree, tvb, svoff+1, 1,
"Unknown Sub-Vector: 0x%02X", tvb_get_guint8(tvb, svoff+1));
}
return sv_length;
}
static void
dissect_trmac(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *mac_tree = NULL;
proto_item *ti;
int mv_length, sv_offset, sv_additional;
guint8 mv_val;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TR MAC");
col_clear(pinfo->cinfo, COL_INFO);
mv_val = tvb_get_guint8(tvb, 3);
/* Interpret the major vector */
if (check_col(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(mv_val, major_vector_vs, "Unknown Major Vector: %u"));
if (tree) {
mv_length = tvb_get_ntohs(tvb, 0);
ti = proto_tree_add_item(tree, proto_trmac, tvb, 0, mv_length, FALSE);
mac_tree = proto_item_add_subtree(ti, ett_tr_mac);
proto_tree_add_uint(mac_tree, hf_trmac_mv, tvb, 3, 1, mv_val);
proto_tree_add_uint_format(mac_tree, hf_trmac_length, tvb, 0, 2, mv_length,
"Total Length: %d bytes", mv_length);
proto_tree_add_uint(mac_tree, hf_trmac_srcclass, tvb, 2, 1, tvb_get_guint8(tvb, 2) & 0x0f);
proto_tree_add_uint(mac_tree, hf_trmac_dstclass, tvb, 2, 1, tvb_get_guint8(tvb, 2) >> 4 );
/* interpret the subvectors */
sv_offset = 4;
while (sv_offset < mv_length) {
sv_additional = sv_text(tvb, sv_offset, mac_tree);
/* if this is a bad packet, we could get a 0-length added here,
* looping forever */
if (sv_additional > 0)
sv_offset += sv_additional;
else
break;
}
}
}
void
proto_register_trmac(void)
{
static hf_register_info hf[] = {
{ &hf_trmac_mv,
{ "Major Vector", "trmac.mvec", FT_UINT8, BASE_HEX, major_vector_vs, 0x0,
NULL, HFILL }},
{ &hf_trmac_length,
{ "Total Length", "trmac.length", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_srcclass,
{ "Source Class", "trmac.srcclass", FT_UINT8, BASE_HEX, classes_vs, 0x0,
NULL, HFILL }},
{ &hf_trmac_dstclass,
{ "Destination Class", "trmac.dstclass", FT_UINT8, BASE_HEX, classes_vs, 0x0,
NULL, HFILL }},
{ &hf_trmac_sv,
{ "Sub-Vector", "trmac.svec", FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_iso,
{ "Isolating Errors", "trmac.errors.iso", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_line,
{ "Line Errors", "trmac.errors.line", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_internal,
{ "Internal Errors", "trmac.errors.internal", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_burst,
{ "Burst Errors", "trmac.errors.burst", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_ac,
{ "A/C Errors", "trmac.errors.ac", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_abort,
{ "Abort Delimiter Transmitted Errors", "trmac.errors.abort", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_noniso,
{ "Non-Isolating Errors", "trmac.errors.noniso", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_lost,
{ "Lost Frame Errors", "trmac.errors.lost", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_congestion,
{ "Receiver Congestion Errors", "trmac.errors.congestion", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_fc,
{ "Frame-Copied Errors", "trmac.errors.fc", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_freq,
{ "Frequency Errors", "trmac.errors.freq", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_errors_token,
{ "Token Errors", "trmac.errors.token", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_trmac_naun,
{ "NAUN", "trmac.naun", FT_ETHER, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
};
static gint *ett[] = {
&ett_tr_mac,
&ett_tr_ierr_cnt,
&ett_tr_nerr_cnt,
};
proto_trmac = proto_register_protocol("Token-Ring Media Access Control",
"TR MAC", "trmac");
proto_register_field_array(proto_trmac, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("trmac", dissect_trmac, proto_trmac);
}
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