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wireshark/packet-fddi.c

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/* packet-fddi.c
* Routines for FDDI packet disassembly
*
* Laurent Deniel <deniel@worldnet.fr>
*
* $Id: packet-fddi.c,v 1.42 2000/11/19 08:53:57 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
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include "bitswap.h"
#include "packet.h"
#include "packet-fddi.h"
#include "packet-llc.h"
#include "resolv.h"
static int proto_fddi = -1;
static int hf_fddi_fc = -1;
static int hf_fddi_dst = -1;
static int hf_fddi_src = -1;
static int hf_fddi_addr = -1;
static gint ett_fddi = -1;
/* 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_FC_CLFF 0xF0 /* Class/Length/Format bits */
#define FDDI_FC_ZZZZ 0x0F /* Control bits */
/*
* Async frame ZZZZ bits:
*/
#define FDDI_FC_ASYNC_R 0x08 /* Reserved */
#define FDDI_FC_ASYNC_PRI 0x07 /* Priority */
#define FDDI_HEADER_SIZE 13
/* field positions */
#define FDDI_P_FC 0
#define FDDI_P_DHOST 1
#define FDDI_P_SHOST 7
static void
swap_mac_addr(u_char *swapped_addr, const u_char *orig_addr)
{
int i;
for (i = 0; i < 6; i++) {
swapped_addr[i] = BIT_SWAP(orig_addr[i]);
}
}
void
capture_fddi(const u_char *pd, packet_counts *ld)
{
int offset = 0, fc;
if (!BYTES_ARE_IN_FRAME(0, FDDI_HEADER_SIZE)) {
ld->other++;
return;
}
offset = FDDI_HEADER_SIZE;
fc = (int) pd[FDDI_P_FC];
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 :
capture_llc(pd, offset, ld);
return;
default :
ld->other++;
return;
} /* fc */
} /* capture_fddi */
static gchar *
fddifc_to_str(int fc)
{
static gchar strbuf[128+1];
switch (fc) {
case FDDI_FC_VOID: /* Void frame */
return "Void frame";
case FDDI_FC_NRT: /* Nonrestricted token */
return "Nonrestricted token";
case FDDI_FC_RT: /* Restricted token */
return "Restricted token";
case FDDI_FC_SMT_INFO: /* SMT Info */
return "SMT info";
case FDDI_FC_SMT_NSA: /* SMT Next station adrs */
return "SMT Next station address";
case FDDI_FC_MAC_BEACON: /* MAC Beacon frame */
return "MAC beacon";
case FDDI_FC_MAC_CLAIM: /* MAC Claim frame */
return "MAC claim token";
default:
switch (fc & FDDI_FC_CLFF) {
case FDDI_FC_MAC:
sprintf(strbuf, "MAC frame, control %x", fc & FDDI_FC_ZZZZ);
return strbuf;
case FDDI_FC_SMT:
sprintf(strbuf, "SMT frame, control %x", fc & FDDI_FC_ZZZZ);
return strbuf;
case FDDI_FC_LLC_ASYNC:
if (fc & FDDI_FC_ASYNC_R)
sprintf(strbuf, "Async LLC frame, control %x", fc & FDDI_FC_ZZZZ);
else
sprintf(strbuf, "Async LLC frame, priority %d",
fc & FDDI_FC_ASYNC_PRI);
return strbuf;
case FDDI_FC_LLC_SYNC:
if (fc & FDDI_FC_ZZZZ) {
sprintf(strbuf, "Sync LLC frame, control %x", fc & FDDI_FC_ZZZZ);
return strbuf;
} else
return "Sync LLC frame";
case FDDI_FC_IMP_ASYNC:
sprintf(strbuf, "Implementor async frame, control %x",
fc & FDDI_FC_ZZZZ);
return strbuf;
case FDDI_FC_IMP_SYNC:
sprintf(strbuf, "Implementor sync frame, control %x",
fc & FDDI_FC_ZZZZ);
return strbuf;
break;
default:
return "Unknown frame type";
}
}
}
void
dissect_fddi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
gboolean bitswapped)
{
int fc;
proto_tree *fh_tree = NULL;
proto_item *ti;
gchar *fc_str;
static u_char src[6], dst[6];
u_char src_swapped[6], dst_swapped[6];
tvbuff_t *next_tvb;
CHECK_DISPLAY_AS_DATA(proto_fddi, tvb, pinfo, tree);
pinfo->current_proto = "FDDI";
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "FDDI");
fc = (int) tvb_get_guint8(tvb, FDDI_P_FC);
fc_str = fddifc_to_str(fc);
if (check_col(pinfo->fd, COL_INFO))
col_add_str(pinfo->fd, COL_INFO, fc_str);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_fddi, tvb, 0, FDDI_HEADER_SIZE,
"Fiber Distributed Data Interface, %s", fc_str);
fh_tree = proto_item_add_subtree(ti, ett_fddi);
proto_tree_add_uint(fh_tree, hf_fddi_fc, tvb, FDDI_P_FC, 1, fc);
}
/* Extract the destination address, possibly bit-swapping it. */
if (bitswapped)
swap_mac_addr(dst, (u_char *) tvb_get_ptr(tvb, FDDI_P_DHOST, 6));
else
memcpy(dst, (u_char *) tvb_get_ptr(tvb, FDDI_P_DHOST, 6), sizeof dst);
swap_mac_addr(dst_swapped, (u_char*) tvb_get_ptr(tvb, FDDI_P_DHOST, 6));
/* XXX - copy them to some buffer associated with "pi", rather than
just making "dst" static? */
SET_ADDRESS(&pi.dl_dst, AT_ETHER, 6, &dst[0]);
SET_ADDRESS(&pi.dst, AT_ETHER, 6, &dst[0]);
if (fh_tree) {
proto_tree_add_ether(fh_tree, hf_fddi_dst, tvb, FDDI_P_DHOST, 6, dst);
proto_tree_add_ether_hidden(fh_tree, hf_fddi_addr, tvb, FDDI_P_DHOST, 6, dst);
/* hide some bit-swapped mac address fields in the proto_tree, just in case */
proto_tree_add_ether_hidden(fh_tree, hf_fddi_dst, tvb, FDDI_P_DHOST, 6, dst_swapped);
proto_tree_add_ether_hidden(fh_tree, hf_fddi_addr, tvb, FDDI_P_DHOST, 6, dst_swapped);
}
/* Extract the source address, possibly bit-swapping it. */
if (bitswapped)
swap_mac_addr(src, (u_char *) tvb_get_ptr(tvb, FDDI_P_SHOST, 6));
else
memcpy(src, (u_char *) tvb_get_ptr(tvb, FDDI_P_SHOST, 6), sizeof src);
swap_mac_addr(src_swapped, (u_char*) tvb_get_ptr(tvb, FDDI_P_SHOST, 6));
/* XXX - copy them to some buffer associated with "pi", rather than
just making "src" static? */
SET_ADDRESS(&pi.dl_src, AT_ETHER, 6, &src[0]);
SET_ADDRESS(&pi.src, AT_ETHER, 6, &src[0]);
if (fh_tree) {
proto_tree_add_ether(fh_tree, hf_fddi_src, tvb, FDDI_P_SHOST, 6, src);
proto_tree_add_ether_hidden(fh_tree, hf_fddi_addr, tvb, FDDI_P_SHOST, 6, src);
/* hide some bit-swapped mac address fields in the proto_tree, just in case */
proto_tree_add_ether_hidden(fh_tree, hf_fddi_src, tvb, FDDI_P_SHOST, 6, src_swapped);
proto_tree_add_ether_hidden(fh_tree, hf_fddi_addr, tvb, FDDI_P_SHOST, 6, src_swapped);
}
next_tvb = tvb_new_subset(tvb, FDDI_HEADER_SIZE, -1, -1);
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(next_tvb, pinfo, tree);
return;
default :
dissect_data(next_tvb, 0, pinfo, tree);
return;
} /* fc */
} /* dissect_fddi */
void
proto_register_fddi(void)
{
static hf_register_info hf[] = {
/*
* XXX - we want this guy to have his own private formatting
* routine, using "fc_to_str()"; if "fc_to_str()" returns
* NULL, just show the hex value, else show the string.
*/
{ &hf_fddi_fc,
{ "Frame Control", "fddi.fc", FT_UINT8, BASE_HEX, NULL, 0x0,
"" }},
{ &hf_fddi_dst,
{ "Destination", "fddi.dst", FT_ETHER, BASE_NONE, NULL, 0x0,
"Destination Hardware Address" }},
{ &hf_fddi_src,
{ "Source", "fddi.src", FT_ETHER, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_fddi_addr,
{ "Source or Destination Address", "fddi.addr", FT_ETHER, BASE_NONE, NULL, 0x0,
"Source or Destination Hardware Address" }},
};
static gint *ett[] = {
&ett_fddi,
};
proto_fddi = proto_register_protocol ("Fiber Distributed Data Interface", "fddi" );
proto_register_field_array(proto_fddi, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
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