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/* GMR-1 GSMtap helpers */
/* (C) 2011-2016 by Sylvain Munaut <tnt@246tNt.com>
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*! \addtogroup gsmtap
* @{
*/
/*! \file gsmtap.c
* \brief Osmocom GMR-1 GSMtap helpers header
*/
#include <stdint.h>
#include <string.h>
#include <arpa/inet.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/gsmtap.h>
#include <osmocom/gmr1/gsmtap.h>
/*! \brief Helper to build GSM tap message with GMR-1 payload
* \param[in] chan_type Type of channel (one of GSMTAP_GMR1_xxx)
* \param[in] l2 Packet of L2 data to encapsulate
* \param[in] len Length of the l2 data in bytes
*/
struct msgb *
gmr1_gsmtap_makemsg(uint8_t chan_type, uint32_t fn, uint8_t tn,
const uint8_t *l2, int len)
{
struct msgb *msg;
struct gsmtap_hdr *gh;
uint8_t *dst;
msg = msgb_alloc(sizeof(*gh) + len, "gmr1_gsmtap_tx");
if (!msg)
return NULL;
gh = (struct gsmtap_hdr *) msgb_put(msg, sizeof(*gh));
gh->version = GSMTAP_VERSION;
gh->hdr_len = sizeof(*gh)/4;
gh->type = GSMTAP_TYPE_GMR1_UM;
gh->timeslot = tn;
gh->sub_slot = 0;
gh->snr_db = 0;
gh->signal_dbm = 0;
gh->frame_number = htonl(fn);
gh->sub_type = chan_type;
gh->antenna_nr = 0;
dst = msgb_put(msg, len);
memcpy(dst, l2, len);
return msg;
}
/*! @} */
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