1 /* RSLms - GSM 08.58 like protocol between L2 and L3 of GSM Um interface */
3 /* (C) 2010 by Harald Welte <laforge@gnumonks.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include <osmocore/msgb.h>
28 #include <osmocore/rsl.h>
29 #include <osmocore/tlv.h>
30 #include <osmocore/protocol/gsm_04_08.h>
32 #include <osmocom/logging.h>
33 #include <osmocom/lapdm.h>
34 #include <osmocom/rslms.h>
35 #include <osmocom/layer3.h>
36 #include <osmocom/osmocom_data.h>
37 #include <osmocom/l1ctl.h>
39 /* Send a 'simple' RLL request to L2 */
40 int rslms_tx_rll_req(struct osmocom_ms *ms, uint8_t msg_type,
41 uint8_t chan_nr, uint8_t link_id)
45 msg = rsl_rll_simple(msg_type, chan_nr, link_id, 1);
47 return rslms_recvmsg(msg, ms);
50 /* Send a RLL request (including L3 info) to L2 */
51 int rslms_tx_rll_req_l3(struct osmocom_ms *ms, uint8_t msg_type,
52 uint8_t chan_nr, uint8_t link_id, struct msgb *msg)
54 rsl_rll_push_l3(msg, msg_type, chan_nr, link_id, 1);
56 return rslms_recvmsg(msg, ms);
59 static int rach_count = 0;
61 static int rslms_rx_udata_ind(struct msgb *msg, struct osmocom_ms *ms)
63 struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
67 DEBUGP(DRSL, "RSLms UNIT DATA IND chan_nr=0x%02x link_id=0x%02x\n",
68 rllh->chan_nr, rllh->link_id);
70 rsl_tlv_parse(&tv, rllh->data, msgb_l2len(msg)-sizeof(*rllh));
71 if (!TLVP_PRESENT(&tv, RSL_IE_L3_INFO)) {
72 DEBUGP(DRSL, "UNIT_DATA_IND without L3 INFO ?!?\n");
75 msg->l3h = (uint8_t *) TLVP_VAL(&tv, RSL_IE_L3_INFO);
77 if (rllh->chan_nr == RSL_CHAN_PCH_AGCH)
78 rc = gsm48_rx_ccch(msg, ms);
79 else if (rllh->chan_nr == RSL_CHAN_BCCH) {
80 rc = gsm48_rx_bcch(msg, ms);
90 static int rslms_rx_rll(struct msgb *msg, struct osmocom_ms *ms)
92 struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
95 switch (rllh->c.msg_type) {
97 DEBUGP(DRSL, "RSLms DATA IND\n");
98 /* FIXME: implement this */
100 case RSL_MT_UNIT_DATA_IND:
101 rc = rslms_rx_udata_ind(msg, ms);
104 DEBUGP(DRSL, "RSLms EST IND\n");
105 /* FIXME: implement this */
107 case RSL_MT_EST_CONF:
108 DEBUGP(DRSL, "RSLms EST CONF\n");
109 /* FIXME: implement this */
111 case RSL_MT_REL_CONF:
112 DEBUGP(DRSL, "RSLms REL CONF\n");
113 /* FIXME: implement this */
115 case RSL_MT_ERROR_IND:
116 DEBUGP(DRSL, "RSLms ERR IND\n");
117 /* FIXME: implement this */
120 LOGP(DRSL, LOGL_NOTICE, "unknown RSLms message type "
121 "0x%02x\n", rllh->c.msg_type);
129 /* input function that L2 calls when sending messages up to L3 */
130 static int layer3_from_layer2(struct msgb *msg, struct osmocom_ms *ms)
132 struct abis_rsl_common_hdr *rslh = msgb_l2(msg);
135 switch (rslh->msg_discr & 0xfe) {
136 case ABIS_RSL_MDISC_RLL:
137 rc = rslms_rx_rll(msg, ms);
140 /* FIXME: implement this */
141 LOGP(DRSL, LOGL_NOTICE, "unknown RSLms msg_discr 0x%02x\n",
151 int layer3_init(struct osmocom_ms *ms)
153 return osmol2_register_handler(ms, &layer3_from_layer2);