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/* packet-fddi.c
* Routines for FDDI packet disassembly
*
* Laurent Deniel <deniel@worldnet.fr>
*
* $Id: packet-fddi.c,v 1.5 1998/10/13 07:48:03 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* 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 <gtk/gtk.h>
#include <stdio.h>
#include <pcap.h>
#include "ethereal.h"
#include "packet.h"
#include "resolv.h"
/* FDDI Frame Control values */
#define FDDI_FC_VOID 0x00 /* Void frame */
#define FDDI_FC_NRT 0x80 /* Nonrestricted token */
#define FDDI_FC_RT 0xc0 /* Restricted token */
#define FDDI_FC_MAC 0xc0 /* MAC frame */
#define FDDI_FC_SMT 0x40 /* SMT frame */
#define FDDI_FC_SMT_INFO 0x41 /* SMT Info */
#define FDDI_FC_SMT_NSA 0x4F /* SMT Next station adrs */
#define FDDI_FC_SMT_MIN FDDI_FC_SMT_INFO
#define FDDI_FC_SMT_MAX FDDI_FC_SMT_NSA
#define FDDI_FC_MAC_MIN 0xc1
#define FDDI_FC_MAC_BEACON 0xc2 /* MAC Beacon frame */
#define FDDI_FC_MAC_CLAIM 0xc3 /* MAC Claim frame */
#define FDDI_FC_MAC_MAX 0xcf
#define FDDI_FC_LLC_ASYNC 0x50 /* Async. LLC frame */
#define FDDI_FC_LLC_ASYNC_MIN FDDI_FC_LLC_ASYNC
#define FDDI_FC_LLC_ASYNC_DEF 0x54
#define FDDI_FC_LLC_ASYNC_MAX 0x5f
#define FDDI_FC_LLC_SYNC 0xd0 /* Sync. LLC frame */
#define FDDI_FC_LLC_SYNC_MIN FDDI_FC_LLC_SYNC
#define FDDI_FC_LLC_SYNC_MAX 0xd7
#define FDDI_FC_IMP_ASYNC 0x60 /* Implementor Async. */
#define FDDI_FC_IMP_ASYNC_MIN FDDI_FC_IMP_ASYNC
#define FDDI_FC_IMP_ASYNC_MAX 0x6f
#define FDDI_FC_IMP_SYNC 0xe0 /* Implementor Synch. */
#define FDDI_HEADER_SIZE 13
/* field positions */
#define FDDI_P_FC 0
#define FDDI_P_DHOST 1
#define FDDI_P_SHOST 7
/* On some systems, the FDDI MAC addresses are bit-swapped. */
#if !defined(ultrix) && !defined(__alpha) && !defined(__bsdi)
#define BIT_SWAPPED_MAC_ADDRS
#endif
#ifdef BIT_SWAPPED_MAC_ADDRS
/* "swaptab[i]" is the value of "i" with the bits reversed. */
static u_char swaptab[256] = {
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
};
#endif
static void get_mac_addr(u_char *swapped_addr, const u_char *addr)
{
int i;
for (i = 0; i < 6; i++) {
#ifdef BIT_SWAPPED_MAC_ADDRS
swapped_addr[i] = swaptab[addr[i]];
#else
swapped_addr[i] = addr[i];
#endif
}
}
void dissect_fddi(const u_char *pd, frame_data *fd, GtkTree *tree)
{
int offset = 0, fc;
GtkWidget *fh_tree, *ti;
u_char src[6], dst[6];
if (fd->cap_len < FDDI_HEADER_SIZE) {
dissect_data(pd, offset, fd, tree);
return;
}
/* Extract the source and destination addresses, possibly bit-swapping
them. */
get_mac_addr(dst, (u_char *)&pd[FDDI_P_DHOST]);
get_mac_addr(src, (u_char *)&pd[FDDI_P_SHOST]);
fc = (int) pd[FDDI_P_FC];
if (fd->win_info[COL_NUM]) {
strcpy(fd->win_info[COL_DESTINATION], get_ether_name(dst));
strcpy(fd->win_info[COL_SOURCE], get_ether_name(src));
strcpy(fd->win_info[COL_INFO], "FDDI");
}
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), 0, offset,
"FDDI %s",
(fc >= FDDI_FC_LLC_ASYNC_MIN && fc <= FDDI_FC_LLC_ASYNC_MAX) ?
"Async LLC" : "unsupported FC");
fh_tree = gtk_tree_new();
add_subtree(ti, fh_tree, ETT_FDDI);
add_item_to_tree(fh_tree, FDDI_P_FC, 1, "Frame Control: 0x%02x", fc);
add_item_to_tree(fh_tree, FDDI_P_DHOST, 6, "Destination: %s (%s)",
ether_to_str(dst), get_ether_name(dst));
add_item_to_tree(fh_tree, FDDI_P_SHOST, 6, "Source: %s (%s)",
ether_to_str(src), get_ether_name(src));
}
offset = FDDI_HEADER_SIZE;
switch (fc) {
/* From now, only 802.2 SNAP (Async. LCC frame) is supported */
case FDDI_FC_LLC_ASYNC + 0 :
case FDDI_FC_LLC_ASYNC + 1 :
case FDDI_FC_LLC_ASYNC + 2 :
case FDDI_FC_LLC_ASYNC + 3 :
case FDDI_FC_LLC_ASYNC + 4 :
case FDDI_FC_LLC_ASYNC + 5 :
case FDDI_FC_LLC_ASYNC + 6 :
case FDDI_FC_LLC_ASYNC + 7 :
case FDDI_FC_LLC_ASYNC + 8 :
case FDDI_FC_LLC_ASYNC + 9 :
case FDDI_FC_LLC_ASYNC + 10 :
case FDDI_FC_LLC_ASYNC + 11 :
case FDDI_FC_LLC_ASYNC + 12 :
case FDDI_FC_LLC_ASYNC + 13 :
case FDDI_FC_LLC_ASYNC + 14 :
case FDDI_FC_LLC_ASYNC + 15 :
dissect_llc(pd, offset, fd, tree);
return;
default :
dissect_data(pd, offset, fd, tree);
return;
} /* fc */
} /* dissect_fddi */
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