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wireshark/packet-brdwlk.c

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/* packet-brdwlk.c
* Routines for decoding MDS Port Analyzer Adapter (FC in Eth) Header
* Copyright 2001, Dinesh G Dutt <ddutt@andiamo.com>
*
* $Id: packet-brdwlk.c,v 1.6 2003/10/30 03:15:26 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <glib.h>
#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif
#include <epan/packet.h>
#include "etypes.h"
#define BRDWLK_MAX_PACKET_CNT 0xFFFF
#define BRDWLK_TRUNCATED_BIT 0x8
#define BRDWLK_HAS_PLEN 0x1
#define FCM_DELIM_SOFC1 0x01
#define FCM_DELIM_SOFI1 0x02
#define FCM_DELIM_SOFI2 0x04
#define FCM_DELIM_SOFI3 0x06
#define FCM_DELIM_SOFN1 0x03
#define FCM_DELIM_SOFN2 0x05
#define FCM_DELIM_SOFN3 0x07
#define FCM_DELIM_SOFF 0x08
#define FCM_DELIM_SOFC4 0x09
#define FCM_DELIM_SOFI4 0x0A
#define FCM_DELIM_SOFN4 0x0B
#define FCM_DELIM_EOFT 0x01
#define FCM_DELIM_EOFDT 0x02
#define FCM_DELIM_EOFN 0x03
#define FCM_DELIM_EOFA 0x04
#define FCM_DELIM_EOFNI 0x07
#define FCM_DELIM_EOFDTI 0x06
#define FCM_DELIM_EOFRT 0x0A
#define FCM_DELIM_EOFRTI 0x0E
#define FCM_DELIM_NOEOF 0xF0
#define FCM_DELIM_EOFJUMBO 0xF1
static const value_string brdwlk_sof_vals[] = {
{FCM_DELIM_SOFI1, "SOFi1"},
{FCM_DELIM_SOFI2, "SOFi2"},
{FCM_DELIM_SOFI3, "SOFi3"},
{FCM_DELIM_SOFN1, "SOFn1"},
{FCM_DELIM_SOFN2, "SOFn2"},
{FCM_DELIM_SOFN3, "SOFn3"},
{FCM_DELIM_SOFF, "SOFf"},
{0, NULL},
};
static const value_string brdwlk_eof_vals[] = {
{FCM_DELIM_EOFDT, "EOFdt"},
{FCM_DELIM_EOFA, "EOFa"},
{FCM_DELIM_EOFN, "EOFn"},
{FCM_DELIM_EOFT, "EOFt"},
{0, NULL},
};
static int hf_brdwlk_sof = -1;
static int hf_brdwlk_eof = -1;
static int hf_brdwlk_error = -1;
static int hf_brdwlk_vsan = -1;
static int hf_brdwlk_pktcnt = -1;
static int hf_brdwlk_drop = -1;
static int hf_brdwlk_plen = -1;
/* Initialize the subtree pointers */
static gint ett_brdwlk = -1;
static gint proto_brdwlk = -1;
static guint16 packet_count = 0;
static gboolean first_pkt = TRUE; /* start of capture */
static dissector_handle_t data_handle;
static dissector_handle_t fc_dissector_handle;
static gchar *
brdwlk_err_to_str (guint8 error, char *str)
{
if (str != NULL) {
str[0] = '\0';
if (error & 0x1) {
strcat (str, "Packet Length Present");
}
if (error & 0x2) {
strcat (str, "Empty Frame, ");
}
if (error & 0x4) {
strcat (str, "No Data, ");
}
if (error & 0x8) {
strcat (str, "Truncated, ");
}
if (error & 0x10) {
strcat (str, "Bad FC CRC, ");
}
if (error & 0x20) {
strcat (str, "Fifo Full, ");
}
if (error & 0x40) {
strcat (str, "Jumbo FC Frame, ");
}
if (error & 0x80) {
strcat (str, "Ctrl Char Inside Frame");
}
}
return (str);
}
/* Code to actually dissect the packets */
static void
dissect_brdwlk (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
proto_tree *brdwlk_tree = NULL;
tvbuff_t *next_tvb;
guint8 error, eof, sof;
int hdrlen = 2,
offset = 0;
gint len, reported_len, plen;
guint16 pkt_cnt;
gboolean dropped_packets;
gchar errstr[512];
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Boardwalk");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
pinfo->vsan = (tvb_get_ntohs (tvb, offset) & 0xFFF);
sof = (tvb_get_guint8 (tvb, offset) & 0xF0) >> 4;
if ((sof == FCM_DELIM_SOFI3) || (sof == FCM_DELIM_SOFI2) || (sof == FCM_DELIM_SOFI1)
|| (sof == FCM_DELIM_SOFI4)) {
pinfo->sof_eof = PINFO_SOF_FIRST_FRAME;
}
else if (sof == FCM_DELIM_SOFF) {
pinfo->sof_eof = PINFO_SOF_SOFF;
}
if (tree) {
ti = proto_tree_add_protocol_format (tree, proto_brdwlk, tvb, 0,
hdrlen, "Boardwalk");
brdwlk_tree = proto_item_add_subtree (ti, ett_brdwlk);
proto_tree_add_item (brdwlk_tree, hf_brdwlk_sof, tvb, offset, 1, 0);
proto_tree_add_item (brdwlk_tree, hf_brdwlk_vsan, tvb, offset, 2, 0);
}
/* Locate EOF which is the last 4 bytes of the frame */
len = tvb_length_remaining(tvb, hdrlen);
reported_len = tvb_reported_length_remaining(tvb, hdrlen);
if (reported_len < 4) {
/*
* This packet is claimed not to even have enough data for
* a 4-byte EOF.
* Don't try to process the EOF.
*/
;
}
else if (len < reported_len) {
/*
* This packet is claimed to have enough data for a 4-byte EOF,
* but we didn't capture all of the packet.
* Slice off the 4-byte EOF from the reported length, and trim
* the captured length so it's no more than the reported length;
* that will slice off what of the EOF, if any, is in the
* captured length.
*/
reported_len -= 4;
if (len > reported_len)
len = reported_len;
}
else {
/*
* We have the entire packet, and it includes a 4-byte EOF.
* Slice it off, and put it into the tree if we're building
* a tree.
*/
len -= 4;
reported_len -= 4;
offset = tvb_reported_length(tvb) - 4;
pkt_cnt = tvb_get_ntohs (tvb, offset);
if (tree) {
proto_tree_add_uint (brdwlk_tree, hf_brdwlk_pktcnt, tvb, offset,
2, pkt_cnt);
}
dropped_packets = FALSE;
if (pinfo->fd->flags.visited) {
/*
* This isn't the first pass, so we can't use the global
* "packet_count" variable to determine whether there were
* any dropped frames or not.
* We therefore attach a non-null pointer as frame data to
* any frame preceded by dropped packets.
*/
if (p_get_proto_data(pinfo->fd, proto_brdwlk) != NULL)
dropped_packets = TRUE;
} else {
/*
* This is the first pass, so we have to use the global
* "packet_count" variable to determine whether there were
* any dropped frames or not.
*
* XXX - can there be more than one stream of packets, so that
* we can't just use a global variable?
*/
if (pkt_cnt != packet_count + 1) {
if (!first_pkt &&
(pkt_cnt != 0 || (packet_count != BRDWLK_MAX_PACKET_CNT))) {
dropped_packets = TRUE;
/*
* Mark this frame as having been preceded by dropped
* packets. (The data we use as the frame data doesn't
* matter - it just matters that it's non-null.)
*/
p_add_proto_data(pinfo->fd, proto_brdwlk, &packet_count);
}
}
if (tree) {
proto_tree_add_boolean_hidden (brdwlk_tree, hf_brdwlk_drop,
tvb, offset, 0, dropped_packets);
}
}
packet_count = pkt_cnt;
error = tvb_get_guint8 (tvb, offset+2);
if (tree) {
proto_tree_add_uint_format (brdwlk_tree, hf_brdwlk_error, tvb,
offset+2, 1, error, "Error: 0x%x (%s)",
error,
brdwlk_err_to_str (error, errstr));
}
eof = tvb_get_guint8 (tvb, offset+3);
if (eof != FCM_DELIM_EOFN) {
pinfo->sof_eof |= PINFO_EOF_LAST_FRAME;
}
else if (eof != FCM_DELIM_EOFT) {
pinfo->sof_eof |= PINFO_EOF_INVALID;
}
if (tree) {
proto_tree_add_item (brdwlk_tree, hf_brdwlk_eof, tvb, offset+3,
1, 0);
}
if ((error & BRDWLK_HAS_PLEN) && tree) {
/* In newer Boardwalks, if this bit is set, the actual frame length
* is also provided. This length is the size between SOF & EOF
* including FC CRC.
*/
plen = tvb_get_ntohl (tvb, offset-4);
plen *= 4;
proto_tree_add_uint (brdwlk_tree, hf_brdwlk_plen, tvb, offset-4,
4, plen);
#if 0
/* XXX - this would throw an exception if it would increase
* the reported length.
*/
if (error & BRDWLK_TRUNCATED_BIT) {
tvb_set_reported_length (tvb, plen);
}
#endif
}
}
next_tvb = tvb_new_subset (tvb, 2, len, reported_len);
if (fc_dissector_handle) {
call_dissector (fc_dissector_handle, next_tvb, pinfo, tree);
}
}
static void
brdwlk_init(void)
{
packet_count = 0;
first_pkt = TRUE;
}
/* Register the protocol with Ethereal */
/* this format is require because a script is used to build the C function
that calls all the protocol registration.
*/
void
proto_register_brdwlk (void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_brdwlk_sof,
{"SOF", "brdwlk.sof", FT_UINT8, BASE_HEX, VALS (brdwlk_sof_vals),
0xF0, "SOF", HFILL}},
{ &hf_brdwlk_eof,
{"EOF", "brdwlk.eof", FT_UINT8, BASE_HEX, VALS (brdwlk_eof_vals),
0x0F, "EOF", HFILL}},
{ &hf_brdwlk_error,
{"Error", "brdwlk.error", FT_UINT8, BASE_DEC, NULL, 0x0, "Error",
HFILL}},
{ &hf_brdwlk_pktcnt,
{"Packet Count", "brdwlk.pktcnt", FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL}},
{ &hf_brdwlk_drop,
{"Packet Dropped", "brdwlk.drop", FT_BOOLEAN, BASE_DEC, NULL, 0x0,
"", HFILL}},
{ &hf_brdwlk_vsan,
{"VSAN", "brdwlk.vsan", FT_UINT16, BASE_DEC, NULL, 0xFFF, "",
HFILL}},
{ &hf_brdwlk_plen,
{"Original Packet Length", "brdwlk.plen", FT_UINT32, BASE_DEC, NULL, 0x0, "",
HFILL}},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_brdwlk,
};
/* Register the protocol name and description */
proto_brdwlk = proto_register_protocol("Boardwalk",
"Boardwalk", "brdwlk");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_brdwlk, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_init_routine(&brdwlk_init);
}
/* If this dissector uses sub-dissector registration add a registration routine.
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_brdwlk(void)
{
dissector_handle_t brdwlk_handle;
brdwlk_handle = create_dissector_handle (dissect_brdwlk, proto_brdwlk);
dissector_add("ethertype", ETHERTYPE_BRDWALK, brdwlk_handle);
dissector_add("ethertype", 0xABCD, brdwlk_handle);
data_handle = find_dissector("data");
fc_dissector_handle = find_dissector ("fc");
}
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