148 lines
3.8 KiB
C
148 lines
3.8 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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*/
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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 <osmocom/core/msgb.h>
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#include <osmocom/gsm/rsl.h>
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#include <osmocom/gsm/tlv.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include <osmocom/bb/common/logging.h>
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#include <osmocom/gsm/lapdm.h>
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#include <osmocom/bb/misc/rslms.h>
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#include <osmocom/bb/misc/layer3.h>
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#include <osmocom/bb/common/osmocom_data.h>
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#include <osmocom/bb/common/l1ctl.h>
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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, 1);
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return lapdm_rslms_recvmsg(msg, &ms->lapdm_channel);
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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, 1);
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return lapdm_rslms_recvmsg(msg, &ms->lapdm_channel);
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}
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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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DEBUGP(DRSL, "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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DEBUGP(DRSL, "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, ms);
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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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DEBUGP(DRSL, "RSLms DATA IND\n");
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/* FIXME: implement this */
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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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DEBUGP(DRSL, "RSLms EST IND\n");
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/* FIXME: implement this */
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break;
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case RSL_MT_EST_CONF:
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DEBUGP(DRSL, "RSLms EST CONF\n");
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/* FIXME: implement this */
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break;
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case RSL_MT_REL_CONF:
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DEBUGP(DRSL, "RSLms REL CONF\n");
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/* FIXME: implement this */
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break;
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case RSL_MT_ERROR_IND:
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DEBUGP(DRSL, "RSLms ERR IND\n");
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/* FIXME: implement this */
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break;
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default:
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LOGP(DRSL, LOGL_NOTICE, "unknown RSLms message type "
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"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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msgb_free(msg);
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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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static int layer3_from_layer2(struct msgb *msg, struct lapdm_entity *le, void *ctx)
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{
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struct osmocom_ms *ms = ctx;
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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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/* FIXME: implement this */
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LOGP(DRSL, LOGL_NOTICE, "unknown RSLms msg_discr 0x%02x\n",
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rslh->msg_discr);
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msgb_free(msg);
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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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int layer3_init(struct osmocom_ms *ms)
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{
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lapdm_channel_set_l3(&ms->lapdm_channel, &layer3_from_layer2, ms);
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return 0;
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}
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