2007-06-18 19:31:34 +00:00
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2007-05-28 06:38:30 +00:00
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/*
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* packet-fcoe.c
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* Routines for FCoE dissection - Fibre Channel over Ethernet
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* Copyright (c) 2006 Nuova Systems, Inc. (jre@nuovasystems.com)
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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@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* Based on packet-fcip.c, Copyright 2001, Dinesh G Dutt (ddutt@cisco.com)
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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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/*
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* For FCoE protocol details, see http://fcoe.com.
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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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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/crc32.h>
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#include <epan/etypes.h>
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#include <epan/expert.h>
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#define FCOE_ENCAP_HEADER_LEN 2
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typedef enum {
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FCOE_EOFn = 0x41,
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FCOE_EOFt = 0x42,
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FCOE_EOFrt = 0x44,
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FCOE_EOFdt = 0x46,
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FCOE_EOFni = 0x49,
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FCOE_EOFdti = 0x4E,
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FCOE_EOFrti = 0x4F,
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FCOE_EOFa = 0x50
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} fcoe_eof_t;
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typedef enum {
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FCOE_SOFf = 0x8,
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FCOE_SOFi4 = 0x9,
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FCOE_SOFi2 = 0xD,
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FCOE_SOFi3 = 0xE,
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FCOE_SOFn4 = 0x1,
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FCOE_SOFn2 = 0x5,
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FCOE_SOFn3 = 0x6,
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FCOE_SOFc4 = 0x9
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} fcoe_sof_t;
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static const value_string fcoe_eof_vals[] = {
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{FCOE_EOFn, "EOFn" },
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{FCOE_EOFt, "EOFt" },
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{FCOE_EOFrt, "EOFrt" },
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{FCOE_EOFdt, "EOFdt" },
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{FCOE_EOFni, "EOFni" },
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{FCOE_EOFdti, "EOFdti" },
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{FCOE_EOFrti, "EOFrti" },
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{FCOE_EOFa, "EOFa" },
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{0, NULL}
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};
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static const value_string fcoe_sof_vals[] = {
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{FCOE_SOFf, "SOFf" },
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{FCOE_SOFi4, "SOFi4" },
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{FCOE_SOFi2, "SOFi2" },
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{FCOE_SOFi3, "SOFi3" },
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{FCOE_SOFn4, "SOFn4" },
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{FCOE_SOFn2, "SOFn2" },
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{FCOE_SOFn3, "SOFn3" },
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{FCOE_SOFc4, "SOFc4" },
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{0, NULL}
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};
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static int proto_fcoe = -1;
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static int hf_fcoe_ver = -1;
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static int hf_fcoe_len = -1;
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static int hf_fcoe_sof = -1;
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static int hf_fcoe_eof = -1;
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static int hf_fcoe_crc = -1;
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static int hf_fcoe_crc_bad = -1;
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static int hf_fcoe_crc_good = -1;
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static int ett_fcoe = -1;
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static int ett_fcoe_crc = -1;
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static dissector_handle_t data_handle;
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static dissector_handle_t fc_handle;
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static void
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dissect_fcoe(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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gint eof_offset = 0;
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gint frame_len = 0;
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guint version;
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char *ver;
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guint16 len_sof;
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gint bytes_remaining = tvb_length_remaining(tvb, 0);
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guint8 sof = 0;
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guint8 eof = 0;
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const char *eof_str;
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char *crc_msg;
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proto_item *ti;
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proto_item *item;
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proto_tree *fcoe_tree = NULL;
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proto_tree *crc_tree;
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tvbuff_t *next_tvb;
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gboolean crc_exists;
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guint32 crc_computed = 0;
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guint32 crc = 0;
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if (bytes_remaining < FCOE_ENCAP_HEADER_LEN) {
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return;
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}
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "FCOE");
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len_sof = tvb_get_ntohs(tvb, 0);
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frame_len = (len_sof & 0x3ff0) >> 2;
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sof = len_sof & 0xf;
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version = len_sof >> 14;
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next_tvb = tvb_new_subset(tvb, FCOE_ENCAP_HEADER_LEN, -1, frame_len - 4);
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if (tree) {
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/*
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* Only version 0 is defined at this point.
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* Don't print the version in the short summary if it is zero.
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*/
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ver = "";
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if (version != 0) {
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int ver_buf_len = 16;
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ver = ep_alloc(ver_buf_len);
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g_snprintf(ver, ver_buf_len, "ver %d ", version);
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}
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eof_offset = FCOE_ENCAP_HEADER_LEN + frame_len;
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eof_str = "none";
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if (tvb_bytes_exist(tvb, eof_offset, 1)) {
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eof = tvb_get_guint8(tvb, eof_offset);
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eof_str = val_to_str(eof, fcoe_eof_vals, "0x%x");
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}
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/*
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* Check the CRC.
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*/
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crc_msg = "";
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crc_exists = tvb_bytes_exist(tvb, eof_offset - 4, 4);
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if (crc_exists) {
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crc = tvb_get_ntohl(tvb, eof_offset - 4);
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crc_computed = crc32_802_tvb(next_tvb, frame_len - 4);
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if (crc != crc_computed) {
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crc_msg = " [bad FC CRC]";
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}
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}
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ti = proto_tree_add_protocol_format(tree, proto_fcoe, tvb, 0,
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FCOE_ENCAP_HEADER_LEN,
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"FCoE %s(%s/%s) %d bytes%s", ver,
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val_to_str(sof, fcoe_sof_vals,
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"0x%x"),
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eof_str, frame_len, crc_msg);
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/* Dissect the FCoE header */
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fcoe_tree = proto_item_add_subtree(ti, ett_fcoe);
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proto_tree_add_uint(fcoe_tree, hf_fcoe_sof, tvb, 1, 1, sof);
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proto_tree_add_uint(fcoe_tree, hf_fcoe_ver, tvb, 0, 1, version);
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proto_tree_add_uint(fcoe_tree, hf_fcoe_len, tvb, 0, 2, frame_len);
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/*
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* Create the CRC information.
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*/
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item = ti;
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if (crc_exists) {
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if (crc == crc_computed) {
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item = proto_tree_add_uint_format(fcoe_tree, hf_fcoe_crc, tvb,
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eof_offset - 4, 4, crc,
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"CRC: %8.8x [valid]", crc);
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} else {
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item = proto_tree_add_uint_format(fcoe_tree, hf_fcoe_crc, tvb,
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eof_offset - 4, 4, crc,
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"CRC: %8.8x "
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"[error: should be %8.8x]",
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crc, crc_computed);
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expert_add_info_format(pinfo, item, PI_CHECKSUM, PI_ERROR,
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"Bad FC CRC %8.8x %8.x",
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crc, crc_computed);
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}
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}
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crc_tree = proto_item_add_subtree(item, ett_fcoe_crc);
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ti = proto_tree_add_boolean(crc_tree, hf_fcoe_crc_bad, tvb,
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eof_offset - 4, 4,
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crc_exists && crc != crc_computed);
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PROTO_ITEM_SET_GENERATED(ti);
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ti = proto_tree_add_boolean(crc_tree, hf_fcoe_crc_good, tvb,
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eof_offset - 4, 4,
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crc_exists && crc == crc_computed);
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PROTO_ITEM_SET_GENERATED(ti);
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/*
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* Interpret the EOF.
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*/
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if (tvb_bytes_exist(tvb, eof_offset, 1)) {
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proto_tree_add_item(fcoe_tree, hf_fcoe_eof, tvb, eof_offset, 1, 0);
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}
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}
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/* Set the SOF/EOF flags in the packet_info header */
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pinfo->sof_eof = 0;
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if (sof == FCOE_SOFi3 || sof == FCOE_SOFi2 || sof == FCOE_SOFi4) {
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pinfo->sof_eof = PINFO_SOF_FIRST_FRAME;
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} else if (sof == FCOE_SOFf) {
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pinfo->sof_eof = PINFO_SOF_SOFF;
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}
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if (eof != FCOE_EOFn) {
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pinfo->sof_eof |= PINFO_EOF_LAST_FRAME;
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} else if (eof != FCOE_EOFt) {
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pinfo->sof_eof |= PINFO_EOF_INVALID;
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}
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/* Call the FC Dissector if this is carrying an FC frame */
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if (fc_handle) {
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call_dissector(fc_handle, next_tvb, pinfo, tree);
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} else if (data_handle) {
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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_fcoe(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_fcoe_sof,
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{"SOF", "fcoe.sof", FT_UINT8, BASE_HEX, VALS(&fcoe_sof_vals), 0,
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"", HFILL}},
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{ &hf_fcoe_eof,
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{"EOF", "fcoe.eof", FT_UINT8, BASE_HEX, VALS(&fcoe_eof_vals), 0,
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"", HFILL}},
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{ &hf_fcoe_ver,
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{"Version", "fcoe.ver", FT_UINT32, BASE_DEC, NULL, 0, "", HFILL}},
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{ &hf_fcoe_len,
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{"Frame length", "fcoe.len", FT_UINT32,
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BASE_DEC, NULL, 0, "", HFILL}},
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{ &hf_fcoe_crc,
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{"CRC", "fcoe.crc", FT_UINT32, BASE_HEX, NULL, 0, "", HFILL}},
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{ &hf_fcoe_crc_good,
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{"CRC good", "fcoe.crc_good", FT_BOOLEAN, BASE_NONE, NULL, 0,
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"True: CRC matches packet content; "
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"False: doesn't match or not checked.", HFILL }},
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{ &hf_fcoe_crc_bad,
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{"CRC bad", "fcoe.crc_bad", FT_BOOLEAN, BASE_NONE, NULL, 0,
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"True: CRC doesn't match packet content; "
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"False: matches or not checked.", HFILL }}
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};
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static gint *ett[] = {
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&ett_fcoe,
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&ett_fcoe_crc
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};
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/* Register the protocol name and description */
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proto_fcoe = proto_register_protocol("Fibre Channel over Ethernet",
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"FCoE", "fcoe");
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/* Required function calls to register the header fields and
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* subtrees used */
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proto_register_field_array(proto_fcoe, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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/*
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2007-06-18 19:31:34 +00:00
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* This function name is required because a script is used to find these
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2007-05-28 06:38:30 +00:00
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* routines and create the code that calls these routines.
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*/
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void
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proto_reg_handoff_fcoe(void)
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{
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2007-06-18 19:31:34 +00:00
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dissector_handle_t fcoe_handle;
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fcoe_handle = create_dissector_handle(dissect_fcoe, proto_fcoe);
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dissector_add("ethertype", ETHERTYPE_FCOE, fcoe_handle);
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data_handle = find_dissector("data");
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fc_handle = find_dissector("fc");
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2007-05-28 06:38:30 +00:00
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}
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