cellular-infrastructure
/
osmo-bsc
mirror of https://gerrit.osmocom.org/osmo-bsc
9
0
Fork 0
Code Issues Releases Wiki Activity

bsc: Look for CM Service Requests with emergency cause 

Look for emergency calls and send them to a MSC that can
handle them properly.
This commit is contained in:
Holger Hans Peter Freyther 2011-06-08 19:25:38 +02:00
parent 210565ed8c
commit 18fa70aa3a
3 changed files with 25 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
openbsc/include/openbsc/osmo_msc_data.h
View File

@ -46,6 +46,7 @@ struct osmo_msc_data {
/* Back pointer */
struct gsm_network *network;
int allow_emerg;
int type;
/* Connection data */

25
openbsc/src/osmo-bsc/osmo_bsc_filter.c
View File

@ -106,6 +106,21 @@ static int handle_page_resp(struct gsm_subscriber_connection *conn, struct msgb
subscr_put(subscr);
return 0;
}
static int is_cm_service_for_emerg(struct msgb *msg)
{
struct gsm48_service_request *cm;
struct gsm48_hdr *gh = msgb_l3(msg);
if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*cm)) {
LOGP(DMSC, LOGL_ERROR, "CM ServiceRequest does not fit.\n");
return 0;
}
cm = (struct gsm48_service_request *) &gh->data[0];
return cm->cm_service_type == GSM48_CMSERV_EMERGENCY;
}
struct osmo_msc_data *bsc_find_msc(struct gsm_subscriber_connection *conn,
struct msgb *msg)
{
@ -115,6 +130,7 @@ struct osmo_msc_data *bsc_find_msc(struct gsm_subscriber_connection *conn,
struct osmo_bsc_data *bsc;
struct osmo_msc_data *msc, *pag_msc;
struct gsm_subscriber *subscr;
int is_emerg = 0;
bsc = conn->bts->network->bsc_data;
@ -135,14 +151,19 @@ struct osmo_msc_data *bsc_find_msc(struct gsm_subscriber_connection *conn,
*/
if (pdisc == GSM48_PDISC_RR && mtype == GSM48_MT_RR_PAG_RESP)
goto paging;
else
else if (pdisc == GSM48_PDISC_MM && mtype == GSM48_MT_MM_CM_SERV_REQ) {
is_emerg = is_cm_service_for_emerg(msg);
goto round_robin;
} else
goto round_robin;
round_robin:
llist_for_each_entry(msc, &bsc->mscs, entry) {
if (!msc->msc_con->is_authenticated)
continue;
if (msc->type != MSC_CON_TYPE_NORMAL)
if (!is_emerg && msc->type != MSC_CON_TYPE_NORMAL)
continue;
if (is_emerg && !msc->allow_emerg)
continue;
/* force round robin by moving it to the end */

1
openbsc/src/osmo-bsc/osmo_bsc_msc.c
View File

@ -492,6 +492,7 @@ struct osmo_msc_data *osmo_msc_data_alloc(struct gsm_network *net, int nr)
msc_data->rtp_base = 4000;
msc_data->nr = nr;
msc_data->allow_emerg = 1;
return msc_data;
}