Add new BSC RLL layer of code
A caller can call rll_establish(lchan, link_id) and a callback to the GSM RLL
code. He will get called back if the RLL link is established or receives some
error message, or the establishment times out.
We need this for proper SMS implementation, where we need to restablish a SAPI3
RLL link before transmitting the actual CP-DATA messages.
diff --git a/openbsc/src/abis_rsl.c b/openbsc/src/abis_rsl.c
index 726ef23..1e828a9 100644
--- a/openbsc/src/abis_rsl.c
+++ b/openbsc/src/abis_rsl.c
@@ -32,6 +32,7 @@
#include <openbsc/gsm_04_08.h>
#include <openbsc/abis_rsl.h>
#include <openbsc/chan_alloc.h>
+#include <openbsc/bsc_rll.h>
#include <openbsc/debug.h>
#include <openbsc/tlv.h>
#include <openbsc/paging.h>
@@ -840,6 +841,24 @@
return abis_rsl_sendmsg(msg);
}
+/* Send "ESTABLISH REQUEST" message with given L3 Info payload */
+/* Chapter 8.3.1 */
+int rsl_establish_request(struct gsm_lchan *lchan, u_int8_t link_id)
+{
+ struct msgb *msg = rsl_msgb_alloc();
+ struct abis_rsl_rll_hdr *rh;
+
+ rh = (struct abis_rsl_rll_hdr *) msgb_put(msg, sizeof(*rh));
+ init_llm_hdr(rh, RSL_MT_REL_REQ);
+ //rh->c.msg_discr |= ABIS_RSL_MDISC_TRANSP;
+ rh->chan_nr = lchan2chan_nr(lchan);
+ rh->link_id = link_id;
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
/* Chapter 8.3.7 Request the release of multiframe mode of RLL connection.
This is what higher layers should call. The BTS then responds with
RELEASE CONFIRM, which we in turn use to trigger RSL CHANNEL RELEASE,
@@ -1212,6 +1231,8 @@
u_int8_t *rlm_cause = rllh->data;
DEBUGPC(DRLL, "ERROR INDICATION cause=0x%02x\n", rlm_cause[1]);
+
+ rll_indication(msg->lchan, rllh->link_id, BSC_RLLR_IND_ERR_IND);
if (rlm_cause[1] == RLL_CAUSE_T200_EXPIRED)
return rsl_chan_release(msg->lchan);
@@ -1254,9 +1275,16 @@
return gsm0408_rcvmsg(msg);
}
break;
+ case RSL_MT_EST_CONF:
+ DEBUGPC(DRLL, "ESTABLISH CONFIRMATION\n");
+ rll_indication(msg->lchan, rllh->link_id,
+ BSC_RLLR_IND_EST_CONF);
+ break;
case RSL_MT_REL_IND:
/* BTS informs us of having received DISC from MS */
DEBUGPC(DRLL, "RELEASE INDICATION\n");
+ rll_indication(msg->lchan, rllh->link_id,
+ BSC_RLLR_IND_REL_IND);
/* we can now releae the channel on the BTS/Abis side */
rsl_chan_release(msg->lchan);
break;