163 lines
4.1 KiB
C
163 lines
4.1 KiB
C
/* RSLms - GSM 08.58 like protocol between L2 and L3 of GSM Um interface */
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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 <stdint.h>
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#include <errno.h>
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#include <stdio.h>
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#include <osmocore/msgb.h>
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#include <osmocore/rsl.h>
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#include <osmocore/tlv.h>
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#include <osmocore/protocol/gsm_04_08.h>
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#include <osmocom/lapdm.h>
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#include <osmocom/rslms.h>
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#include <osmocom/layer3.h>
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#include <osmocom/osmocom_data.h>
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#include <osmocom/l1ctl.h>
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int rsl_dec_chan_nr(uint8_t chan_nr, uint8_t *type, uint8_t *subch, uint8_t *timeslot)
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{
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*timeslot = chan_nr & 0x7;
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if ((chan_nr & 0xf8) == RSL_CHAN_Bm_ACCHs) {
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*type = RSL_CHAN_Bm_ACCHs;
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*subch = 0;
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} else if ((chan_nr & 0xf0) == RSL_CHAN_Lm_ACCHs) {
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*type = RSL_CHAN_Lm_ACCHs;
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*subch = (chan_nr >> 3) & 0x1;
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} else if ((chan_nr & 0xe0) == RSL_CHAN_SDCCH4_ACCH) {
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*type = RSL_CHAN_SDCCH4_ACCH;
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*subch = (chan_nr >> 3) & 0x3;
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} else if ((chan_nr & 0xc0) == RSL_CHAN_SDCCH8_ACCH) {
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*type = RSL_CHAN_SDCCH8_ACCH;
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*subch = (chan_nr >> 3) & 0x7;
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} else {
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printf("unable to decode chan_nr\n");
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return -EINVAL;
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}
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return 0;
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}
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/* Send a 'simple' RLL request to L2 */
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int rslms_tx_rll_req(struct osmocom_ms *ms, uint8_t msg_type,
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uint8_t chan_nr, uint8_t link_id)
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{
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struct msgb *msg;
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msg = rsl_rll_simple(msg_type, chan_nr, link_id);
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return rslms_recvmsg(msg, ms);
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}
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/* Send a RLL request (including L3 info) to L2 */
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int rslms_tx_rll_req_l3(struct osmocom_ms *ms, uint8_t msg_type,
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uint8_t chan_nr, uint8_t link_id, struct msgb *msg)
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{
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rsl_rll_push_l3(msg, msg_type, chan_nr, link_id);
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return rslms_recvmsg(msg, ms);
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}
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static int rach_count = 0;
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static int rslms_rx_udata_ind(struct msgb *msg, struct osmocom_ms *ms)
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{
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struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
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struct tlv_parsed tv;
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int rc = 0;
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printf("RSLms UNIT DATA IND chan_nr=0x%02x link_id=0x%02x\n",
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rllh->chan_nr, rllh->link_id);
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rsl_tlv_parse(&tv, rllh->data, msgb_l2len(msg)-sizeof(*rllh));
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if (!TLVP_PRESENT(&tv, RSL_IE_L3_INFO)) {
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printf("UNIT_DATA_IND without L3 INFO ?!?\n");
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return -EIO;
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}
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msg->l3h = (uint8_t *) TLVP_VAL(&tv, RSL_IE_L3_INFO);
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if (rllh->chan_nr == RSL_CHAN_PCH_AGCH)
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rc = gsm48_rx_ccch(msg, ms);
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else if (rllh->chan_nr == RSL_CHAN_BCCH) {
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rc = gsm48_rx_bcch(msg);
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if (rach_count < 2) {
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tx_ph_rach_req(ms);
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rach_count++;
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}
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}
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return rc;
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}
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static int rslms_rx_rll(struct msgb *msg, struct osmocom_ms *ms)
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{
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struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
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int rc = 0;
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switch (rllh->c.msg_type) {
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case RSL_MT_DATA_IND:
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printf("RSLms DATA IND\n");
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break;
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case RSL_MT_UNIT_DATA_IND:
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rc = rslms_rx_udata_ind(msg, ms);
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break;
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case RSL_MT_EST_IND:
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printf("RSLms EST IND\n");
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break;
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case RSL_MT_EST_CONF:
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printf("RSLms EST CONF\n");
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break;
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case RSL_MT_REL_CONF:
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printf("RSLms REL CONF\n");
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break;
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case RSL_MT_ERROR_IND:
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printf("RSLms ERR IND\n");
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break;
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default:
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printf("unknown RSLms message type 0x%02x\n", rllh->c.msg_type);
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rc = -EINVAL;
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break;
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}
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return rc;
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}
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/* input function that L2 calls when sending messages up to L3 */
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int rslms_sendmsg(struct msgb *msg, struct osmocom_ms *ms)
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{
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struct abis_rsl_common_hdr *rslh = msgb_l2(msg);
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int rc = 0;
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switch (rslh->msg_discr & 0xfe) {
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case ABIS_RSL_MDISC_RLL:
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rc = rslms_rx_rll(msg, ms);
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break;
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default:
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printf("unknown RSLms msg_discr 0x%02x\n", rslh->msg_discr);
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rc = -EINVAL;
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break;
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}
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return rc;
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}
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