71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/* GPRS SNDCP protocol implementation as per 3GPP TS 04.65 */
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/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <errno.h>
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#include <stdint.h>
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#include <osmocore/msgb.h>
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#include <osmocore/linuxlist.h>
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#include <osmocore/timer.h>
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#include <osmocore/talloc.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/debug.h>
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#include <openbsc/gprs_bssgp.h>
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#include <openbsc/gprs_llc.h>
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/* Chapter 7.2: SN-PDU Formats */
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struct sndcp_common_hdr {
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/* octet 1 */
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uint8_t nsapi:4;
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uint8_t more:1;
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uint8_t type:1;
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uint8_t first:1;
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uint8_t spare:1;
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/* octet 2 */
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uint8_t pcomp;
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uint8_t dcomp;
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};
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struct sndcp_udata_hdr {
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/* octet 3 */
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uint8_t npdu_high:4;
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uint8_t seg_nr:4;
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/* octet 4 */
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uint8_t npdu_low;
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};
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/* Entry point for the LL-UNITDATA.indication */
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int sndcp_unitdata_ind(struct msgb *msg, uint8_t sapi, uint8_t *hdr, uint8_t len)
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{
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struct sndcp_udata_hdr *suh;
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uint16_t npdu;
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if (suh->type == 0) {
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LOGP(DGPRS, LOGL_ERROR, "SN-DATA PDU at unitdata_ind() function\n");
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return -EINVAL;
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}
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npdu = (suh->npdu_high << 8) | suh->npdu_low;
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}
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