![Bill Meier](/assets/img/avatar_default.png)
Change-Id: I1ad94654343e5a018a0b3159481d45ffb3a91263 Reviewed-on: https://code.wireshark.org/review/4363 Reviewed-by: Bill Meier <wmeier@newsguy.com>
370 lines
14 KiB
C
370 lines
14 KiB
C
/* 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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* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <etypes.h>
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#include <epan/prefs.h>
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#include "packet-fc.h"
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void proto_register_mdshdr(void);
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void proto_reg_handoff_mdshdr(void);
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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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static int hf_mdshdr_no_trailer = -1;
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static int hf_mdshdr_span = -1;
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static int hf_mdshdr_fccrc = -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 gboolean decode_if_zero_etype = TRUE;
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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, ""}, intentionally removed*/
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{0, NULL},
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};
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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;
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proto_item *hidden_item;
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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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guint pktlen;
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tvbuff_t *next_tvb;
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guint8 sof, eof;
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int trailer_start = 0; /*0 means "no trailer found"*/
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fc_data_t fc_data;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MDS Header");
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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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/* The Mdshdr trailer is at the end of the frame */
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if ((tvb_length(tvb) >= (MDSHDR_HEADER_SIZE + pktlen))
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/* Avoid header/trailer overlap if something wrong */
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&& (pktlen >= MDSHDR_TRAILER_SIZE)) {
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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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fc_data.sof_eof = 0;
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if ((sof == MDSHDR_SOFi3) || (sof == MDSHDR_SOFi2) || (sof == MDSHDR_SOFi1)
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|| (sof == MDSHDR_SOFi4)) {
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fc_data.sof_eof = FC_DATA_SOF_FIRST_FRAME;
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}
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else if (sof == MDSHDR_SOFf) {
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fc_data.sof_eof = FC_DATA_SOF_SOFF;
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}
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if (eof != MDSHDR_EOFn) {
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fc_data.sof_eof |= FC_DATA_EOF_LAST_FRAME;
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}
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else if (eof != MDSHDR_EOFt) {
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fc_data.sof_eof |= FC_DATA_EOF_INVALID;
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}
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if (tree) {
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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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val_to_str(sof, sof_vals, "Unknown(%u)"),
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val_to_str(eof, eof_vals, "Unknown(%u)"));
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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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mdshdr_tree_hdr = proto_tree_add_subtree(mdshdr_tree_main, tvb, MDSHDR_VER_OFFSET,
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MDSHDR_HEADER_SIZE, ett_mdshdr_hdr, NULL, "MDS Header");
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hidden_item = proto_tree_add_item(mdshdr_tree_hdr, hf_mdshdr_sof, tvb, MDSHDR_SOF_OFFSET,
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MDSHDR_SIZE_BYTE, ENC_BIG_ENDIAN);
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PROTO_ITEM_SET_HIDDEN(hidden_item);
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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, ENC_BIG_ENDIAN);
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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, ENC_BIG_ENDIAN);
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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, ENC_BIG_ENDIAN);
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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, ENC_BIG_ENDIAN);
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hidden_item = proto_tree_add_item(mdshdr_tree_hdr, hf_mdshdr_span,
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tvb, MDSHDR_VSAN_OFFSET,
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MDSHDR_SIZE_INT16, ENC_BIG_ENDIAN);
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PROTO_ITEM_SET_HIDDEN(hidden_item);
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/* Add Mdshdr Trailer part */
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if (tvb_length(tvb) >= MDSHDR_HEADER_SIZE + pktlen
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&& 0 != trailer_start) {
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mdshdr_tree_trlr = proto_tree_add_subtree(mdshdr_tree_main, tvb, trailer_start,
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MDSHDR_TRAILER_SIZE,
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ett_mdshdr_trlr, NULL, "MDS Trailer");
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proto_tree_add_item(mdshdr_tree_trlr, hf_mdshdr_eof, tvb,
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trailer_start, MDSHDR_SIZE_BYTE, ENC_BIG_ENDIAN);
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proto_tree_add_item(mdshdr_tree_trlr, hf_mdshdr_fccrc, tvb,
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trailer_start+2, MDSHDR_SIZE_INT32, ENC_BIG_ENDIAN);
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}
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else {
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proto_tree_add_item(mdshdr_tree_main, hf_mdshdr_no_trailer, tvb, 0, 0, ENC_NA);
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}
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}
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if (tvb_length(tvb) >= MDSHDR_HEADER_SIZE + pktlen
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&& 0 != pktlen /*if something wrong*/) {
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next_tvb = tvb_new_subset_length(tvb, MDSHDR_HEADER_SIZE, pktlen);
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/* XXX what to do with the rest of this frame? --ArtemTamazov */
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}
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else {
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next_tvb = tvb_new_subset_remaining(tvb, MDSHDR_HEADER_SIZE);
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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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fc_data.ethertype = ETHERTYPE_FCFT;
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call_dissector_with_data(fc_dissector_handle, next_tvb, pinfo, tree, &fc_data);
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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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void
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proto_register_mdshdr(void)
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{
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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, NULL, HFILL}},
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{ &hf_mdshdr_pkt_len,
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{"Packet Len", "mdshdr.plen", FT_UINT16, BASE_DEC, NULL, 0x1FFF, NULL, HFILL}},
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{ &hf_mdshdr_dstidx,
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{"Dst Index", "mdshdr.dstidx", FT_UINT16, BASE_HEX, NULL, 0xFFC, NULL, HFILL}},
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{ &hf_mdshdr_srcidx,
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{"Src Index", "mdshdr.srcidx", FT_UINT16, BASE_HEX, NULL, 0x3FF, NULL, HFILL}},
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{ &hf_mdshdr_vsan,
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{"VSAN", "mdshdr.vsan", FT_UINT16, BASE_DEC, NULL, 0x0FFF, NULL, HFILL}},
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{ &hf_mdshdr_eof,
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{"EOF", "mdshdr.eof", FT_UINT8, BASE_DEC, VALS(eof_vals), 0x0, NULL, HFILL}},
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{ &hf_mdshdr_no_trailer,
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{"MDS Trailer: Not Found", "mdshdr.no_trailer", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL}},
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{ &hf_mdshdr_span,
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{"SPAN Frame", "mdshdr.span", FT_UINT16, BASE_DEC, NULL, 0xF000, NULL, HFILL}},
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{ &hf_mdshdr_fccrc,
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{"CRC", "mdshdr.crc", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, 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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module_t *mdshdr_module;
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/* Register the protocol name and description */
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proto_mdshdr = proto_register_protocol("MDS Header", "MDS Header", "mdshdr");
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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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mdshdr_module = prefs_register_protocol(proto_mdshdr, proto_reg_handoff_mdshdr);
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prefs_register_bool_preference(mdshdr_module, "decode_if_etype_zero",
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"Decode as MDS Header if Ethertype == 0",
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"A frame is considered for decoding as MDSHDR if either "
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"ethertype is 0xFCFC or zero. Turn this flag off if you "
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"don't want ethertype zero to be decoded as MDSHDR. "
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"This might be useful to avoid problems with test frames.",
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&decode_if_zero_etype);
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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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static dissector_handle_t mdshdr_handle;
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static gboolean registered_for_zero_etype = FALSE;
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static gboolean mdshdr_prefs_initialized = FALSE;
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if (!mdshdr_prefs_initialized) {
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/*
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* This is the first time this has been called (i.e.,
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* Wireshark/TShark is starting up), so create a handle for
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* the MDS Header dissector, register the dissector for
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* ethertype ETHERTYPE_FCFT, and fetch the data and Fibre
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* Channel handles.
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*/
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mdshdr_handle = create_dissector_handle(dissect_mdshdr, proto_mdshdr);
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dissector_add_uint("ethertype", ETHERTYPE_FCFT, 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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mdshdr_prefs_initialized = TRUE;
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}
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/*
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* Only register the dissector for ethertype 0 if the preference
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* is set to do so.
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*/
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if (decode_if_zero_etype) {
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/*
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* The preference to register for ethertype ETHERTYPE_UNK (0)
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* is set; if we're not registered for ethertype ETHERTYPE_UNK,
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* do so.
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*/
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if (!registered_for_zero_etype) {
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dissector_add_uint("ethertype", ETHERTYPE_UNK, mdshdr_handle);
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registered_for_zero_etype = TRUE;
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}
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} else {
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/*
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* The preference to register for ethertype ETHERTYPE_UNK (0)
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* is not set; if we're registered for ethertype ETHERTYPE_UNK,
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* undo that registration.
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*/
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if (registered_for_zero_etype) {
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dissector_delete_uint("ethertype", ETHERTYPE_UNK, mdshdr_handle);
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registered_for_zero_etype = FALSE;
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}
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}
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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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