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/* GPRS SNDCP protocol implementation as per 3GPP TS 04.65 */
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* 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.
*
*/
#include <errno.h>
#include <stdint.h>
#include <osmocore/msgb.h>
#include <osmocore/linuxlist.h>
#include <osmocore/timer.h>
#include <osmocore/talloc.h>
#include <openbsc/gsm_data.h>
#include <openbsc/debug.h>
#include <openbsc/gprs_bssgp.h>
#include <openbsc/gprs_llc.h>
/* Chapter 7.2: SN-PDU Formats */
struct sndcp_common_hdr {
/* octet 1 */
uint8_t nsapi:4;
uint8_t more:1;
uint8_t type:1;
uint8_t first:1;
uint8_t spare:1;
/* octet 2 */
uint8_t pcomp;
uint8_t dcomp;
};
struct sndcp_udata_hdr {
/* octet 3 */
uint8_t npdu_high:4;
uint8_t seg_nr:4;
/* octet 4 */
uint8_t npdu_low;
};
/* Entry point for the LL-UNITDATA.indication */
int sndcp_unitdata_ind(struct msgb *msg, uint8_t sapi, uint8_t *hdr, uint8_t len)
{
struct sndcp_udata_hdr *suh;
uint16_t npdu;
if (suh->type == 0) {
LOGP(DGPRS, LOGL_ERROR, "SN-DATA PDU at unitdata_ind() function\n");
return -EINVAL;
}
npdu = (suh->npdu_high << 8) | suh->npdu_low;
}
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