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bsc_api: Implement transparent RLL establishment and SAPI n REJECT

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When submitting a DTAP message, the BSC API will attempt to
establish the RLL layer and then send the message or send an
SAPI n REJECT. This will be used by the SMS code.
This commit is contained in:
Holger Hans Peter Freyther
2010-06-15 11:20:52 +08:00
parent 0cfbe26cb9
commit 9c595b7474
2 changed files with 47 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
openbsc/include/openbsc/gsm_data.h
View File

@@ -105,6 +105,8 @@ struct openbsc_msgb_cb {
#define msgb_bcid(__x) OBSC_MSGB_CB(__x)->bssgp_cell_id
#define msgb_llch(__x) OBSC_MSGB_CB(__x)->llch
#define OBSC_LINKID_CB(__msgb) (__msgb)->cb[3]
enum gsm_security_event {
GSM_SECURITY_NOAVAIL,
GSM_SECURITY_AUTH_FAILED,

46
openbsc/src/bsc_api.c
View File

@@ -23,12 +23,16 @@
*/
#include <openbsc/bsc_api.h>
#include <openbsc/bsc_rll.h>
#include <openbsc/gsm_data.h>
#include <openbsc/signal.h>
#include <openbsc/abis_rsl.h>
#include <osmocore/talloc.h>
static void rll_ind_cb(struct gsm_lchan *, uint8_t, void *, enum bsc_rllr_ind);
static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id);
int bsc_api_init(struct gsm_network *network, struct bsc_api *api)
{
network->bsc_api = api;
@@ -38,9 +42,21 @@ int bsc_api_init(struct gsm_network *network, struct bsc_api *api)
int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
struct msgb *msg, int link_id)
{
uint8_t sapi = link_id & 0x7;
msg->lchan = conn->lchan;
msg->trx = msg->lchan->ts->trx;
return rsl_data_request(msg, link_id);
if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) {
OBSC_LINKID_CB(msg) = link_id;
if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) {
msgb_free(msg);
send_sapi_reject(conn, link_id);
return -1;
}
return 0;
} else {
return rsl_data_request(msg, link_id);
}
}
/* dequeue messages to layer 4 */
@@ -62,6 +78,34 @@ int bsc_upqueue(struct gsm_network *net)
return work;
}
static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id)
{
struct bsc_api *api;
api = conn->bts->network->bsc_api;
if (!api || !api->sapi_n_reject)
return;
api->sapi_n_reject(conn, link_id);
}
static void rll_ind_cb(struct gsm_lchan *lchan, uint8_t link_id, void *_data, enum bsc_rllr_ind rllr_ind)
{
struct msgb *msg = _data;
switch (rllr_ind) {
case BSC_RLLR_IND_EST_CONF:
rsl_data_request(msg, OBSC_LINKID_CB(msg));
break;
case BSC_RLLR_IND_REL_IND:
case BSC_RLLR_IND_ERR_IND:
case BSC_RLLR_IND_TIMEOUT:
send_sapi_reject(&lchan->conn, OBSC_LINKID_CB(msg));
msgb_free(msg);
break;
}
}
static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal,
void *handler_data, void *signal_data)
{