74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/* GMR-1 GSMtap helpers */
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/* (C) 2011-2019 by Sylvain Munaut <tnt@246tNt.com>
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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 Affero General Public License as published by
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* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*! \addtogroup gsmtap
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* @{
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*/
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/*! \file gsmtap.c
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* \brief Osmocom GMR-1 GSMtap helpers header
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*/
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#include <stdint.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/gsmtap.h>
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#include <osmocom/gmr1/gsmtap.h>
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/*! \brief Helper to build GSM tap message with GMR-1 payload
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* \param[in] chan_type Type of channel (one of GSMTAP_GMR1_xxx)
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* \param[in] l2 Packet of L2 data to encapsulate
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* \param[in] len Length of the l2 data in bytes
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*/
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struct msgb *
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gmr1_gsmtap_makemsg(uint8_t chan_type, uint32_t fn, uint8_t tn,
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const uint8_t *l2, int len)
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{
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struct msgb *msg;
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struct gsmtap_hdr *gh;
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uint8_t *dst;
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msg = msgb_alloc(sizeof(*gh) + len, "gmr1_gsmtap_tx");
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if (!msg)
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return NULL;
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gh = (struct gsmtap_hdr *) msgb_put(msg, sizeof(*gh));
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gh->version = GSMTAP_VERSION;
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gh->hdr_len = sizeof(*gh)/4;
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gh->type = GSMTAP_TYPE_GMR1_UM;
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gh->timeslot = tn;
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gh->sub_slot = 0;
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gh->snr_db = 0;
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gh->signal_dbm = 0;
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gh->frame_number = htonl(fn);
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gh->sub_type = chan_type;
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gh->antenna_nr = 0;
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dst = msgb_put(msg, len);
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memcpy(dst, l2, len);
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return msg;
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}
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/*! @} */
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