339 lines
11 KiB
C
339 lines
11 KiB
C
|
/*
|
||
|
* packet-fcoe.c
|
||
|
* Routines for FCoE dissection - Fibre Channel over Ethernet
|
||
|
* Copyright (c) 2006 Nuova Systems, Inc. (jre@nuovasystems.com)
|
||
|
*
|
||
|
* $Id$
|
||
|
*
|
||
|
* Wireshark - Network traffic analyzer
|
||
|
* By Gerald Combs <gerald@ethereal.com>
|
||
|
* Copyright 1998 Gerald Combs
|
||
|
*
|
||
|
* Based on packet-fcip.c, Copyright 2001, Dinesh G Dutt (ddutt@cisco.com)
|
||
|
*
|
||
|
* 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.
|
||
|
*/
|
||
|
|
||
|
/*
|
||
|
* For FCoE protocol details, see http://fcoe.com.
|
||
|
*/
|
||
|
|
||
|
#ifdef HAVE_CONFIG_H
|
||
|
# include "config.h"
|
||
|
#endif
|
||
|
|
||
|
#include <stdio.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
|
||
|
#include <glib.h>
|
||
|
|
||
|
#include <epan/packet.h>
|
||
|
#include <epan/prefs.h>
|
||
|
#include <epan/crc32.h>
|
||
|
#include <epan/etypes.h>
|
||
|
#include <epan/expert.h>
|
||
|
|
||
|
#define FCOE_ENCAP_HEADER_LEN 2
|
||
|
|
||
|
typedef enum {
|
||
|
FCOE_EOFn = 0x41,
|
||
|
FCOE_EOFt = 0x42,
|
||
|
FCOE_EOFrt = 0x44,
|
||
|
FCOE_EOFdt = 0x46,
|
||
|
FCOE_EOFni = 0x49,
|
||
|
FCOE_EOFdti = 0x4E,
|
||
|
FCOE_EOFrti = 0x4F,
|
||
|
FCOE_EOFa = 0x50
|
||
|
} fcoe_eof_t;
|
||
|
|
||
|
typedef enum {
|
||
|
FCOE_SOFf = 0x8,
|
||
|
FCOE_SOFi4 = 0x9,
|
||
|
FCOE_SOFi2 = 0xD,
|
||
|
FCOE_SOFi3 = 0xE,
|
||
|
FCOE_SOFn4 = 0x1,
|
||
|
FCOE_SOFn2 = 0x5,
|
||
|
FCOE_SOFn3 = 0x6,
|
||
|
FCOE_SOFc4 = 0x9
|
||
|
} fcoe_sof_t;
|
||
|
|
||
|
static const value_string fcoe_eof_vals[] = {
|
||
|
{FCOE_EOFn, "EOFn" },
|
||
|
{FCOE_EOFt, "EOFt" },
|
||
|
{FCOE_EOFrt, "EOFrt" },
|
||
|
{FCOE_EOFdt, "EOFdt" },
|
||
|
{FCOE_EOFni, "EOFni" },
|
||
|
{FCOE_EOFdti, "EOFdti" },
|
||
|
{FCOE_EOFrti, "EOFrti" },
|
||
|
{FCOE_EOFa, "EOFa" },
|
||
|
{0, NULL}
|
||
|
};
|
||
|
|
||
|
static const value_string fcoe_sof_vals[] = {
|
||
|
{FCOE_SOFf, "SOFf" },
|
||
|
{FCOE_SOFi4, "SOFi4" },
|
||
|
{FCOE_SOFi2, "SOFi2" },
|
||
|
{FCOE_SOFi3, "SOFi3" },
|
||
|
{FCOE_SOFn4, "SOFn4" },
|
||
|
{FCOE_SOFn2, "SOFn2" },
|
||
|
{FCOE_SOFn3, "SOFn3" },
|
||
|
{FCOE_SOFc4, "SOFc4" },
|
||
|
{0, NULL}
|
||
|
};
|
||
|
|
||
|
static int proto_fcoe = -1;
|
||
|
static int hf_fcoe_ver = -1;
|
||
|
static int hf_fcoe_len = -1;
|
||
|
static int hf_fcoe_sof = -1;
|
||
|
static int hf_fcoe_eof = -1;
|
||
|
static int hf_fcoe_crc = -1;
|
||
|
static int hf_fcoe_crc_bad = -1;
|
||
|
static int hf_fcoe_crc_good = -1;
|
||
|
|
||
|
static int ett_fcoe = -1;
|
||
|
static int ett_fcoe_crc = -1;
|
||
|
|
||
|
static guint fcoe_ethertype = ETHERTYPE_FCOE;
|
||
|
|
||
|
static dissector_handle_t data_handle;
|
||
|
static dissector_handle_t fc_handle;
|
||
|
static void fcoe_apply_prefs(void);
|
||
|
|
||
|
static void
|
||
|
dissect_fcoe(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
||
|
{
|
||
|
gint eof_offset = 0;
|
||
|
gint frame_len = 0;
|
||
|
guint version;
|
||
|
char *ver;
|
||
|
guint16 len_sof;
|
||
|
gint bytes_remaining = tvb_length_remaining(tvb, 0);
|
||
|
guint8 sof = 0;
|
||
|
guint8 eof = 0;
|
||
|
const char *eof_str;
|
||
|
char *crc_msg;
|
||
|
proto_item *ti;
|
||
|
proto_item *item;
|
||
|
proto_tree *fcoe_tree = NULL;
|
||
|
proto_tree *crc_tree;
|
||
|
tvbuff_t *next_tvb;
|
||
|
gboolean crc_exists;
|
||
|
guint32 crc_computed = 0;
|
||
|
guint32 crc = 0;
|
||
|
|
||
|
if (bytes_remaining < FCOE_ENCAP_HEADER_LEN) {
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
||
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FCOE");
|
||
|
|
||
|
len_sof = tvb_get_ntohs(tvb, 0);
|
||
|
frame_len = (len_sof & 0x3ff0) >> 2;
|
||
|
sof = len_sof & 0xf;
|
||
|
version = len_sof >> 14;
|
||
|
next_tvb = tvb_new_subset(tvb, FCOE_ENCAP_HEADER_LEN, -1, frame_len - 4);
|
||
|
|
||
|
if (tree) {
|
||
|
|
||
|
/*
|
||
|
* Only version 0 is defined at this point.
|
||
|
* Don't print the version in the short summary if it is zero.
|
||
|
*/
|
||
|
ver = "";
|
||
|
if (version != 0) {
|
||
|
int ver_buf_len = 16;
|
||
|
ver = ep_alloc(ver_buf_len);
|
||
|
g_snprintf(ver, ver_buf_len, "ver %d ", version);
|
||
|
}
|
||
|
eof_offset = FCOE_ENCAP_HEADER_LEN + frame_len;
|
||
|
eof_str = "none";
|
||
|
if (tvb_bytes_exist(tvb, eof_offset, 1)) {
|
||
|
eof = tvb_get_guint8(tvb, eof_offset);
|
||
|
eof_str = val_to_str(eof, fcoe_eof_vals, "0x%x");
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Check the CRC.
|
||
|
*/
|
||
|
crc_msg = "";
|
||
|
crc_exists = tvb_bytes_exist(tvb, eof_offset - 4, 4);
|
||
|
if (crc_exists) {
|
||
|
crc = tvb_get_ntohl(tvb, eof_offset - 4);
|
||
|
crc_computed = crc32_802_tvb(next_tvb, frame_len - 4);
|
||
|
if (crc != crc_computed) {
|
||
|
crc_msg = " [bad FC CRC]";
|
||
|
}
|
||
|
}
|
||
|
|
||
|
ti = proto_tree_add_protocol_format(tree, proto_fcoe, tvb, 0,
|
||
|
FCOE_ENCAP_HEADER_LEN,
|
||
|
"FCoE %s(%s/%s) %d bytes%s", ver,
|
||
|
val_to_str(sof, fcoe_sof_vals,
|
||
|
"0x%x"),
|
||
|
eof_str, frame_len, crc_msg);
|
||
|
|
||
|
/* Dissect the FCoE header */
|
||
|
|
||
|
fcoe_tree = proto_item_add_subtree(ti, ett_fcoe);
|
||
|
proto_tree_add_uint(fcoe_tree, hf_fcoe_sof, tvb, 1, 1, sof);
|
||
|
proto_tree_add_uint(fcoe_tree, hf_fcoe_ver, tvb, 0, 1, version);
|
||
|
proto_tree_add_uint(fcoe_tree, hf_fcoe_len, tvb, 0, 2, frame_len);
|
||
|
|
||
|
/*
|
||
|
* Create the CRC information.
|
||
|
*/
|
||
|
item = ti;
|
||
|
if (crc_exists) {
|
||
|
if (crc == crc_computed) {
|
||
|
item = proto_tree_add_uint_format(fcoe_tree, hf_fcoe_crc, tvb,
|
||
|
eof_offset - 4, 4, crc,
|
||
|
"CRC: %8.8x [valid]", crc);
|
||
|
} else {
|
||
|
item = proto_tree_add_uint_format(fcoe_tree, hf_fcoe_crc, tvb,
|
||
|
eof_offset - 4, 4, crc,
|
||
|
"CRC: %8.8x "
|
||
|
"[error: should be %8.8x]",
|
||
|
crc, crc_computed);
|
||
|
expert_add_info_format(pinfo, item, PI_CHECKSUM, PI_ERROR,
|
||
|
"Bad FC CRC %8.8x %8.x",
|
||
|
crc, crc_computed);
|
||
|
}
|
||
|
}
|
||
|
crc_tree = proto_item_add_subtree(item, ett_fcoe_crc);
|
||
|
ti = proto_tree_add_boolean(crc_tree, hf_fcoe_crc_bad, tvb,
|
||
|
eof_offset - 4, 4,
|
||
|
crc_exists && crc != crc_computed);
|
||
|
PROTO_ITEM_SET_GENERATED(ti);
|
||
|
ti = proto_tree_add_boolean(crc_tree, hf_fcoe_crc_good, tvb,
|
||
|
eof_offset - 4, 4,
|
||
|
crc_exists && crc == crc_computed);
|
||
|
PROTO_ITEM_SET_GENERATED(ti);
|
||
|
|
||
|
/*
|
||
|
* Interpret the EOF.
|
||
|
*/
|
||
|
if (tvb_bytes_exist(tvb, eof_offset, 1)) {
|
||
|
proto_tree_add_item(fcoe_tree, hf_fcoe_eof, tvb, eof_offset, 1, 0);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Set the SOF/EOF flags in the packet_info header */
|
||
|
pinfo->sof_eof = 0;
|
||
|
if (sof == FCOE_SOFi3 || sof == FCOE_SOFi2 || sof == FCOE_SOFi4) {
|
||
|
pinfo->sof_eof = PINFO_SOF_FIRST_FRAME;
|
||
|
} else if (sof == FCOE_SOFf) {
|
||
|
pinfo->sof_eof = PINFO_SOF_SOFF;
|
||
|
}
|
||
|
|
||
|
if (eof != FCOE_EOFn) {
|
||
|
pinfo->sof_eof |= PINFO_EOF_LAST_FRAME;
|
||
|
} else if (eof != FCOE_EOFt) {
|
||
|
pinfo->sof_eof |= PINFO_EOF_INVALID;
|
||
|
}
|
||
|
|
||
|
/* Call the FC Dissector if this is carrying an FC frame */
|
||
|
|
||
|
if (fc_handle) {
|
||
|
call_dissector(fc_handle, next_tvb, pinfo, tree);
|
||
|
} else if (data_handle) {
|
||
|
call_dissector(data_handle, next_tvb, pinfo, tree);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void
|
||
|
proto_register_fcoe(void)
|
||
|
{
|
||
|
/* Setup list of header fields See Section 1.6.1 for details*/
|
||
|
static hf_register_info hf[] = {
|
||
|
{ &hf_fcoe_sof,
|
||
|
{"SOF", "fcoe.sof", FT_UINT8, BASE_HEX, VALS(&fcoe_sof_vals), 0,
|
||
|
"", HFILL}},
|
||
|
{ &hf_fcoe_eof,
|
||
|
{"EOF", "fcoe.eof", FT_UINT8, BASE_HEX, VALS(&fcoe_eof_vals), 0,
|
||
|
"", HFILL}},
|
||
|
{ &hf_fcoe_ver,
|
||
|
{"Version", "fcoe.ver", FT_UINT32, BASE_DEC, NULL, 0, "", HFILL}},
|
||
|
{ &hf_fcoe_len,
|
||
|
{"Frame length", "fcoe.len", FT_UINT32,
|
||
|
BASE_DEC, NULL, 0, "", HFILL}},
|
||
|
{ &hf_fcoe_crc,
|
||
|
{"CRC", "fcoe.crc", FT_UINT32, BASE_HEX, NULL, 0, "", HFILL}},
|
||
|
{ &hf_fcoe_crc_good,
|
||
|
{"CRC good", "fcoe.crc_good", FT_BOOLEAN, BASE_NONE, NULL, 0,
|
||
|
"True: CRC matches packet content; "
|
||
|
"False: doesn't match or not checked.", HFILL }},
|
||
|
{ &hf_fcoe_crc_bad,
|
||
|
{"CRC bad", "fcoe.crc_bad", FT_BOOLEAN, BASE_NONE, NULL, 0,
|
||
|
"True: CRC doesn't match packet content; "
|
||
|
"False: matches or not checked.", HFILL }}
|
||
|
};
|
||
|
static gint *ett[] = {
|
||
|
&ett_fcoe,
|
||
|
&ett_fcoe_crc
|
||
|
};
|
||
|
module_t *fcoe_module;
|
||
|
|
||
|
/* Register the protocol name and description */
|
||
|
proto_fcoe = proto_register_protocol("Fibre Channel over Ethernet",
|
||
|
"FCoE", "fcoe");
|
||
|
|
||
|
/* Required function calls to register the header fields and
|
||
|
* subtrees used */
|
||
|
proto_register_field_array(proto_fcoe, hf, array_length(hf));
|
||
|
proto_register_subtree_array(ett, array_length(ett));
|
||
|
|
||
|
fcoe_module = prefs_register_protocol(proto_fcoe, fcoe_apply_prefs);
|
||
|
prefs_register_uint_preference(fcoe_module,
|
||
|
"ethertype",
|
||
|
"Ether Type",
|
||
|
"ethernet type number used for FCOE",
|
||
|
16,
|
||
|
&fcoe_ethertype);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
fcoe_apply_prefs(void)
|
||
|
{
|
||
|
static guint active_ethertype = 0;
|
||
|
static dissector_handle_t fcoe_handle;
|
||
|
|
||
|
if (fcoe_handle == 0) {
|
||
|
fcoe_handle = create_dissector_handle(dissect_fcoe, proto_fcoe);
|
||
|
}
|
||
|
if (active_ethertype != fcoe_ethertype) {
|
||
|
if (active_ethertype != 0) {
|
||
|
dissector_delete("ethertype", active_ethertype, fcoe_handle);
|
||
|
}
|
||
|
if (fcoe_handle != 0) {
|
||
|
dissector_add("ethertype", fcoe_ethertype, fcoe_handle);
|
||
|
active_ethertype = fcoe_ethertype;
|
||
|
}
|
||
|
}
|
||
|
data_handle = find_dissector("data");
|
||
|
fc_handle = find_dissector("fc");
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* This format is required because a script is used to find these
|
||
|
* routines and create the code that calls these routines.
|
||
|
*/
|
||
|
void
|
||
|
proto_reg_handoff_fcoe(void)
|
||
|
{
|
||
|
fcoe_apply_prefs();
|
||
|
}
|