317 lines
11 KiB
C
317 lines
11 KiB
C
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/* packet-mdshdr.c
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* Routines for dissection of Cisco MDS Switch Internal Header
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* Copyright 2001, Dinesh G Dutt <ddutt@andiamo.com>
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*
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* $Id: packet-mdshdr.c,v 1.1 2003/01/22 06:26:33 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* Copied from WHATEVER_FILE_YOU_USED (where "WHATEVER_FILE_YOU_USED"
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* is a dissector file; if you just copied this from README.developer,
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* don't bother with the "Copied from" - you don't even need to put
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* in a "Copied from" if you copied an existing dissector, especially
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* if the bulk of the code in the new dissector is your code)
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <glib.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#include <epan/value_string.h>
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#include <etypes.h>
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#include <epan/packet.h>
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#include "prefs.h"
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#define MDSHDR_VERSION_OFFSET 0
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/* Mdshdr Control bits */
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#define MDSHDR_CTL_IDXDIRECT 1
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#define MDSHDR_CTL_IGNACLO 2
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#define MDSHDR_CTL_DRP 4
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/* OFFSETS OF FIELDS */
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#define MDSHDR_VER_OFFSET 0
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#define MDSHDR_SOF_OFFSET 1
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#define MDSHDR_PKTLEN_OFFSET 2
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#define MDSHDR_DIDX_OFFSET 5
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#define MDSHDR_SIDX_OFFSET 6
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#define MDSHDR_VSAN_OFFSET 13
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/* Two size definitions are sufficient */
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#define MDSHDR_SIZE_BYTE sizeof (gchar)
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#define MDSHDR_SIZE_INT16 sizeof (guint16)
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#define MDSHDR_SIZE_INT32 sizeof (guint32)
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/* Other miscellaneous defines; can't rely on sizeof structs */
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#define MDSHDR_MAX_VERSION 0
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#define MDSHDR_HEADER_SIZE 16
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#define MDSHDR_TRAILER_SIZE 6
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/* SOF Encodings */
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#define MDSHDR_SOFc1 0x1
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#define MDSHDR_SOFi1 0x2
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#define MDSHDR_SOFn1 0x3
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#define MDSHDR_SOFi2 0x4
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#define MDSHDR_SOFn2 0x5
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#define MDSHDR_SOFi3 0x6
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#define MDSHDR_SOFn3 0x7
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#define MDSHDR_SOFf 0x8
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#define MDSHDR_SOFc4 0x9
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#define MDSHDR_SOFi4 0xa
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#define MDSHDR_SOFn4 0xb
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/* EOF Encodings */
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#define MDSHDR_EOFt 0x1
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#define MDSHDR_EOFdt 0x2
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#define MDSHDR_EOFa 0x4
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#define MDSHDR_EOFn 0x3
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#define MDSHDR_EOFdti 0x6
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#define MDSHDR_EOFni 0x7
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#define MDSHDR_EOFrt 0xa
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#define MDSHDR_EOFrti 0xe
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#define MDSHDR_EOF_UNKNOWN 0xb
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/* Initialize the protocol and registered fields */
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static int proto_mdshdr = -1;
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static int hf_mdshdr_sof = -1;
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static int hf_mdshdr_pkt_len = -1;
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static int hf_mdshdr_dstidx = -1;
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static int hf_mdshdr_srcidx = -1;
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static int hf_mdshdr_vsan = -1;
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static int hf_mdshdr_eof = -1;
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/* Initialize the subtree pointers */
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static gint ett_mdshdr = -1;
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static gint ett_mdshdr_hdr = -1;
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static gint ett_mdshdr_trlr = -1;
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static dissector_handle_t data_handle, fc_dissector_handle;
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static const value_string sof_vals[] = {
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{MDSHDR_SOFc1, "SOFc1"},
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{MDSHDR_SOFi1, "SOFi1"},
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{MDSHDR_SOFn1, "SOFn1"},
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{MDSHDR_SOFi2, "SOFi2"},
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{MDSHDR_SOFn2, "SOFn2"},
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{MDSHDR_SOFi3, "SOFi3"},
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{MDSHDR_SOFn3, "SOFn3"},
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{MDSHDR_SOFc4, "SOFc4"},
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{MDSHDR_SOFi4, "SOFi4"},
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{MDSHDR_SOFn4, "SOFn4"},
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{MDSHDR_SOFf, "SOFf"},
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{0, NULL},
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};
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static const value_string eof_vals[] = {
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{MDSHDR_EOFt, "EOFt"},
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{MDSHDR_EOFdt, "EOFdt"},
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{MDSHDR_EOFa, "EOFa"},
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{MDSHDR_EOFn, "EOFn"},
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{MDSHDR_EOFdti, "EOFdti"},
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{MDSHDR_EOFni, "EOFni"},
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{MDSHDR_EOFrt, "EOFrt"},
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{MDSHDR_EOFrti, "EOFrti"},
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{MDSHDR_EOF_UNKNOWN, ""},
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{0, NULL},
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};
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static const gchar * sof_strings[] = {
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"Null", "SOFc1", "SOFi1", "SOFn1", "SOFi2", "SOFn2", "SOFi3", "SOFn3",
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"SOFf", "SOFc4", "SOFi4", "SOFn4",
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};
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static const gchar *eof_strings[] = {
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"Null", "EOFt", "EOFdt", "EOFn", "EOFa", "", "EOFdti", "EOFni",
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"", "", "EOFrt", "", "", "", "EOFrti",
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};
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/* Code to actually dissect the packets */
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static void
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dissect_mdshdr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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/* Set up structures needed to add the protocol subtree and manage it */
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proto_item *ti_main, *ti_hdr, *ti_trlr;
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proto_tree *mdshdr_tree_main, *mdshdr_tree_hdr, *mdshdr_tree_trlr;
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int offset = 0,
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pktlen;
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tvbuff_t *next_tvb;
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guint8 sof, eof;
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guint16 vsan;
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int trailer_start = 0;
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/* Make entries in Protocol column and Info column on summary display */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MDS Header");
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if (check_col (pinfo->cinfo, COL_INFO))
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col_clear (pinfo->cinfo, COL_INFO);
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sof = tvb_get_guint8 (tvb, offset+MDSHDR_SOF_OFFSET) & 0x0F;
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pktlen = tvb_get_ntohs (tvb, offset+MDSHDR_PKTLEN_OFFSET) & 0x1FFF;
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vsan = tvb_get_ntohs (tvb, offset+MDSHDR_VSAN_OFFSET) & 0x0FFF;
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/* The Mdshdr trailer is at the end of the frame */
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if (tvb_bytes_exist (tvb, 0, MDSHDR_HEADER_SIZE + pktlen)) {
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trailer_start = MDSHDR_HEADER_SIZE + pktlen - MDSHDR_TRAILER_SIZE;
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eof = tvb_get_guint8 (tvb, trailer_start);
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tvb_set_reported_length (tvb, MDSHDR_HEADER_SIZE+pktlen);
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}
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else {
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eof = MDSHDR_EOF_UNKNOWN;
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}
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pinfo->src_idx = (tvb_get_ntohs (tvb, MDSHDR_SIDX_OFFSET) & 0x3FF);
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pinfo->dst_idx = (tvb_get_ntohs (tvb, MDSHDR_DIDX_OFFSET) & 0xFFC) >> 6;
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pinfo->vsan = vsan;
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/* In the interest of speed, if "tree" is NULL, don't do any work not
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necessary to generate protocol tree items. */
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if (tree) {
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/* create display subtree for the protocol */
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ti_main = proto_tree_add_protocol_format (tree, proto_mdshdr, tvb, 0,
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MDSHDR_HEADER_SIZE+pktlen,
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"MDS Header(%s/%s)",
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sof_strings[sof], eof_strings[eof]);
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mdshdr_tree_main = proto_item_add_subtree (ti_main, ett_mdshdr);
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/* Add Header part as subtree first */
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ti_hdr = proto_tree_add_text (mdshdr_tree_main, tvb, MDSHDR_VER_OFFSET,
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MDSHDR_HEADER_SIZE, "MDS Header");
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mdshdr_tree_hdr = proto_item_add_subtree (ti_hdr, ett_mdshdr_hdr);
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proto_tree_add_item_hidden (mdshdr_tree_hdr, hf_mdshdr_sof, tvb, MDSHDR_SOF_OFFSET,
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MDSHDR_SIZE_BYTE, 0);
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proto_tree_add_item (mdshdr_tree_hdr, hf_mdshdr_pkt_len, tvb, MDSHDR_PKTLEN_OFFSET,
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MDSHDR_SIZE_INT16, 0);
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proto_tree_add_item (mdshdr_tree_hdr, hf_mdshdr_dstidx, tvb, MDSHDR_DIDX_OFFSET,
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MDSHDR_SIZE_INT16, 0);
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proto_tree_add_item (mdshdr_tree_hdr, hf_mdshdr_srcidx, tvb, MDSHDR_SIDX_OFFSET,
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MDSHDR_SIZE_INT16, 0);
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proto_tree_add_item (mdshdr_tree_hdr, hf_mdshdr_vsan, tvb, MDSHDR_VSAN_OFFSET,
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MDSHDR_SIZE_INT16, 0);
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/* Add Mdshdr Trailer part */
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if (tvb_bytes_exist (tvb, 0, MDSHDR_HEADER_SIZE+pktlen)) {
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ti_trlr = proto_tree_add_text (mdshdr_tree_main, tvb, trailer_start,
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MDSHDR_TRAILER_SIZE,
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"MDS Trailer");
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mdshdr_tree_trlr = proto_item_add_subtree (ti_trlr, ett_mdshdr_trlr);
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proto_tree_add_item (mdshdr_tree_trlr, hf_mdshdr_eof, tvb,
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trailer_start, MDSHDR_SIZE_BYTE, 0);
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}
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}
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/* If this protocol has a sub-dissector call it here, see section 1.8 */
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if (tvb_bytes_exist (tvb, 0, MDSHDR_HEADER_SIZE+pktlen)) {
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next_tvb = tvb_new_subset (tvb, MDSHDR_HEADER_SIZE, pktlen, pktlen);
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}
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else {
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next_tvb = tvb_new_subset (tvb, MDSHDR_HEADER_SIZE, -1, -1);
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}
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/* Call the Fibre Channel dissector */
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if (fc_dissector_handle) {
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call_dissector (fc_dissector_handle, next_tvb, pinfo, tree);
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}
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else {
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call_dissector (data_handle, next_tvb, pinfo, tree);
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}
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}
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/* Register the protocol with Ethereal. This format is require because a script
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* is used to build the C function that calls all the protocol registration.
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*/
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void
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proto_register_mdshdr(void)
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{
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{ &hf_mdshdr_sof,
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{"SOF", "mdshdr.sof", FT_UINT8, BASE_DEC, VALS(sof_vals), 0x0, "", HFILL}},
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{ &hf_mdshdr_pkt_len,
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{"Packet Len", "mdshdr.plen", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}},
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{ &hf_mdshdr_dstidx,
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{"Dst Index", "mdshdr.dstidx", FT_UINT16, BASE_HEX, NULL, 0xFFC, "", HFILL}},
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{ &hf_mdshdr_srcidx,
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{"Src Index", "mdshdr.srcidx", FT_UINT16, BASE_HEX, NULL, 0x3FF, "", HFILL}},
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{ &hf_mdshdr_vsan,
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{"VSAN", "mdshdr.vsan", FT_UINT16, BASE_DEC, NULL, 0x0FFF, "", HFILL}},
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{ &hf_mdshdr_eof,
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{"EOF", "mdshdr.eof", FT_UINT8, BASE_DEC, VALS(eof_vals), 0x0, "", HFILL}},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_mdshdr,
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&ett_mdshdr_hdr,
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&ett_mdshdr_trlr
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};
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/* Register the protocol name and description */
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proto_mdshdr = proto_register_protocol("MDS Header", "mdshdr", "mdshdr");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_mdshdr, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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/* If this dissector uses sub-dissector registration add a registration routine.
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This format is required because a script is used to find these routines and
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create the code that calls these routines.
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*/
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void
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proto_reg_handoff_mdshdr(void)
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{
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dissector_handle_t mdshdr_handle;
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mdshdr_handle = create_dissector_handle (dissect_mdshdr, proto_mdshdr);
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dissector_add ("ethertype", ETHERTYPE_UNK, mdshdr_handle);
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data_handle = find_dissector ("data");
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fc_dissector_handle = find_dissector ("fc");
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}
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