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wireshark/epan/dissectors/packet-fcoe.c

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/*
* packet-fcoe.c
* Routines for FCoE dissection - Fibre Channel over Ethernet
* Copyright (c) 2006 Nuova Systems, Inc. (jre@nuovasystems.com)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* For FCoE protocol details, see http://fcoe.com.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/crc32-tvb.h>
#include <epan/etypes.h>
#include <epan/expert.h>
#include "packet-fc.h"
void proto_register_fcoe(void);
void proto_reg_handoff_fcoe(void);
#define FCOE_HEADER_LEN 14 /* header: version, SOF, and padding */
#define FCOE_TRAILER_LEN 8 /* trailer: CRC, EOF, and padding */
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 = 0x28,
FCOE_SOFi4 = 0x29,
FCOE_SOFi2 = 0x2D,
FCOE_SOFi3 = 0x2E,
FCOE_SOFn4 = 0x31,
FCOE_SOFn2 = 0x35,
FCOE_SOFn3 = 0x36,
FCOE_SOFc4 = 0x39
} 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_status = -1;
static int ett_fcoe = -1;
static expert_field ei_fcoe_crc = EI_INIT;
static dissector_handle_t fc_handle;
static int
dissect_fcoe(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
gint crc_offset;
gint eof_offset;
gint frame_len = 0;
gint header_len = FCOE_HEADER_LEN;
guint version;
const char *ver;
guint16 len_sof;
gint bytes_remaining;
guint8 sof = 0;
guint8 eof = 0;
const char *eof_str;
const char *crc_msg;
const char *len_msg;
proto_item *ti;
proto_tree *fcoe_tree;
tvbuff_t *next_tvb;
gboolean crc_exists;
guint32 crc_computed = 0;
guint32 crc = 0;
fc_data_t fc_data;
/*
* For now, handle both the version defined before and after August 2007.
* In the newer version, byte 1 is reserved and always zero. In the old
* version, it'll never be zero.
*/
if (tvb_get_guint8(tvb, 1)) {
header_len = 2;
len_sof = tvb_get_ntohs(tvb, 0);
frame_len = ((len_sof & 0x3ff0) >> 2) - 4;
sof = len_sof & 0xf;
sof |= (sof < 8) ? 0x30 : 0x20;
version = len_sof >> 14;
ver = "pre-T11 ";
if (version != 0)
ver = wmem_strdup_printf(wmem_packet_scope(), ver, "pre-T11 ver %d ", version);
} else {
frame_len = tvb_reported_length_remaining(tvb, 0) -
FCOE_HEADER_LEN - FCOE_TRAILER_LEN;
sof = tvb_get_guint8(tvb, FCOE_HEADER_LEN - 1);
/*
* Only version 0 is defined at this point.
* Don't print the version in the short summary if it is zero.
*/
ver = "";
version = tvb_get_guint8(tvb, 0) >> 4;
if (version != 0)
ver = wmem_strdup_printf(wmem_packet_scope(), ver, "ver %d ", version);
}
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FCoE");
crc_offset = header_len + frame_len;
eof_offset = crc_offset + 4;
bytes_remaining = tvb_captured_length_remaining(tvb, header_len);
if (bytes_remaining > frame_len)
bytes_remaining = frame_len; /* backing length */
next_tvb = tvb_new_subset(tvb, header_len, bytes_remaining, 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, crc_offset, 4);
if (crc_exists) {
crc = tvb_get_ntohl(tvb, crc_offset);
crc_computed = crc32_802_tvb(next_tvb, frame_len);
if (crc != crc_computed) {
crc_msg = " [bad FC CRC]";
}
}
len_msg = "";
if ((frame_len % 4) != 0 || frame_len < 24) {
len_msg = " [invalid length]";
}
ti = proto_tree_add_protocol_format(tree, proto_fcoe, tvb, 0,
header_len,
"FCoE %s(%s/%s) %d bytes%s%s", ver,
val_to_str(sof, fcoe_sof_vals,
"0x%x"),
eof_str, frame_len, crc_msg,
len_msg);
/* Dissect the FCoE header */
fcoe_tree = proto_item_add_subtree(ti, ett_fcoe);
proto_tree_add_uint(fcoe_tree, hf_fcoe_ver, tvb, 0, 1, version);
if (tvb_get_guint8(tvb, 1)) {
proto_tree_add_uint(fcoe_tree, hf_fcoe_len, tvb, 0, 2, frame_len);
}
proto_tree_add_uint(fcoe_tree, hf_fcoe_sof, tvb,
header_len - 1, 1, sof);
/*
* Create the CRC information.
*/
if (crc_exists) {
proto_tree_add_checksum(fcoe_tree, tvb, crc_offset, hf_fcoe_crc, hf_fcoe_crc_status, &ei_fcoe_crc, pinfo, crc_computed, ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY);
proto_tree_set_appendix(fcoe_tree, tvb, crc_offset,
tvb_captured_length_remaining (tvb, crc_offset));
} else {
proto_tree_add_checksum(fcoe_tree, tvb, crc_offset, hf_fcoe_crc, hf_fcoe_crc_status, &ei_fcoe_crc, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NOT_PRESENT);
}
/*
* Interpret the EOF.
*/
if (tvb_bytes_exist(tvb, eof_offset, 1)) {
proto_tree_add_item(fcoe_tree, hf_fcoe_eof, tvb, eof_offset, 1, ENC_BIG_ENDIAN);
}
/* Set the SOF/EOF flags in the packet_info header */
fc_data.sof_eof = 0;
if (sof == FCOE_SOFi3 || sof == FCOE_SOFi2 || sof == FCOE_SOFi4) {
fc_data.sof_eof = FC_DATA_SOF_FIRST_FRAME;
} else if (sof == FCOE_SOFf) {
fc_data.sof_eof = FC_DATA_SOF_SOFF;
}
if (eof != FCOE_EOFn) {
fc_data.sof_eof |= FC_DATA_EOF_LAST_FRAME;
} else if (eof != FCOE_EOFt) {
fc_data.sof_eof |= FC_DATA_EOF_INVALID;
}
/* Call the FC Dissector if this is carrying an FC frame */
fc_data.ethertype = 0;
if (fc_handle) {
call_dissector_with_data(fc_handle, next_tvb, pinfo, tree, &fc_data);
} else {
call_data_dissector(next_tvb, pinfo, tree);
}
return tvb_captured_length(tvb);
}
void
proto_register_fcoe(void)
{
module_t *fcoe_module;
/* 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,
NULL, HFILL}},
{ &hf_fcoe_eof,
{"EOF", "fcoe.eof", FT_UINT8, BASE_HEX, VALS(fcoe_eof_vals), 0,
NULL, HFILL}},
{ &hf_fcoe_ver,
{"Version", "fcoe.ver", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL}},
{ &hf_fcoe_len,
{"Frame length", "fcoe.len", FT_UINT32,
BASE_DEC, NULL, 0, NULL, HFILL}},
{ &hf_fcoe_crc,
{"CRC", "fcoe.crc", FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL}},
{ &hf_fcoe_crc_status,
{"CRC Status", "fcoe.crc.status", FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0,
NULL, HFILL }}
};
static gint *ett[] = {
&ett_fcoe,
};
static ei_register_info ei[] = {
{ &ei_fcoe_crc, { "fcoe.crc.bad", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }},
};
expert_module_t* expert_fcoe;
/* 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));
expert_fcoe = expert_register_protocol(proto_fcoe);
expert_register_field_array(expert_fcoe, ei, array_length(ei));
fcoe_module = prefs_register_protocol(proto_fcoe, NULL);
prefs_register_obsolete_preference(fcoe_module, "ethertype");
}
void
proto_reg_handoff_fcoe(void)
{
dissector_handle_t fcoe_handle;
fcoe_handle = create_dissector_handle(dissect_fcoe, proto_fcoe);
dissector_add_uint("ethertype", ETHERTYPE_FCOE, fcoe_handle);
fc_handle = find_dissector_add_dependency("fc", proto_fcoe);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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