static int gsm48_sendmsg(struct msgb *msg)
{
if (msg->lchan)
msg->dst = msg->lchan->ts->trx->rsl_link;
msg->l3h = msg->data;
return rsl_data_request(msg, 0);
}
/*! \brief process incoming 08.08 DTAP from MSC (send via BTS to MS) */
int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
struct msgb *msg, int link_id, int allow_sacch)
{
uint8_t sapi;
if (!conn->lchan) {
LOGP(DMSC, LOGL_ERROR,
"Called submit dtap without an lchan.\n");
msgb_free(msg);
return -1;
}
sapi = link_id & 0x7;
msg->lchan = conn->lchan;
msg->dst = msg->lchan->ts->trx->rsl_link;
/* If we are on a TCH and need to submit a SMS (on SAPI=3) we need to use the SACH */
if (allow_sacch && sapi != 0) {
if (conn->lchan->type == GSM_LCHAN_TCH_F || conn->lchan->type == GSM_LCHAN_TCH_H)
link_id |= 0x40;
}
msg->l3h = msg->data;
/* is requested SAPI already up? */
if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) {
/* Establish L2 for additional SAPI */
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 {
/* Directly forward via RLL/RSL to BTS */
return rsl_data_request(msg, 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;
/*
* There seems to be a small window that the RLL timer can
* fire after a lchan_release call and before the S_CHALLOC_FREED
* is called. Check if a conn is set before proceeding.
*/
if (!lchan->conn)
return;
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;
}
}