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/* atm.c
*
* $Id$
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
*
* 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 "wtap-int.h"
#include "atm.h"
/*
* Routines to use with ATM capture file types that don't include information
* about the *type* of ATM traffic (or, at least, where we haven't found
* that information).
*
* We assume the traffic is AAL5, unless it's VPI 0/VCI 5, in which case
* we assume it's the signalling AAL.
*/
void
atm_guess_traffic_type(const guint8 *pd, guint32 len,
union wtap_pseudo_header *pseudo_header)
{
/*
* Start out assuming nothing other than that it's AAL5.
*/
pseudo_header->atm.aal = AAL_5;
pseudo_header->atm.type = TRAF_UNKNOWN;
pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
if (pseudo_header->atm.vpi == 0) {
/*
* Traffic on some PVCs with a VPI of 0 and certain
* VCIs is of particular types.
*/
switch (pseudo_header->atm.vci) {
case 5:
/*
* Signalling AAL.
*/
pseudo_header->atm.aal = AAL_SIGNALLING;
return;
case 16:
/*
* ILMI.
*/
pseudo_header->atm.type = TRAF_ILMI;
return;
}
}
/*
* OK, we can't tell what it is based on the VPI/VCI; try
* guessing based on the contents, if we have enough data
* to guess.
*/
if (len >= 3) {
if (pd[0] == 0xaa && pd[1] == 0xaa && pd[2] == 0x03) {
/*
* Looks like a SNAP header; assume it's LLC
* multiplexed RFC 1483 traffic.
*/
pseudo_header->atm.type = TRAF_LLCMX;
} else {
/*
* Assume it's LANE.
*/
pseudo_header->atm.type = TRAF_LANE;
atm_guess_lane_type(pd, len, pseudo_header);
}
}
}
void
atm_guess_lane_type(const guint8 *pd, guint32 len,
union wtap_pseudo_header *pseudo_header)
{
if (len >= 2) {
if (pd[0] == 0xff && pd[1] == 0x00) {
/*
* Looks like LE Control traffic.
*/
pseudo_header->atm.subtype = TRAF_ST_LANE_LE_CTRL;
} else {
/*
* XXX - Ethernet, or Token Ring?
* Assume Ethernet for now; if we see earlier
* LANE traffic, we may be able to figure out
* the traffic type from that, but there may
* still be situations where the user has to
* tell us.
*/
pseudo_header->atm.subtype = TRAF_ST_LANE_802_3;
}
}
}
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