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osmo-msc
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periodic/lu: Attempt to implicitly attach a subscriber instead of rejecting 

When modern Smartphones receive "Not in VLR". The baseband firmware
apparently does not try to do an IMSI ATTACH but just remains un-happy
and will not connect to the network anymore.
This commit is contained in:
Holger Hans Peter Freyther 2013-12-27 17:19:19 +01:00
parent defb10fa62
commit 2147bc4cc9
1 changed files with 17 additions and 4 deletions
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21
openbsc/src/libmsc/gsm_04_08.c
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@ -804,6 +804,21 @@ int gsm48_tx_mm_auth_rej(struct gsm_subscriber_connection *conn)
return gsm48_tx_simple(conn, GSM48_PDISC_MM, GSM48_MT_MM_AUTH_REJ);
}
/*
* At the 30C3 phones miss their periodic update
* interval a lot and then remain unreachable. In case
* we still know the TMSI we can just attach it again.
*/
static void implit_attach(struct gsm_subscriber_connection *conn)
{
if (conn->subscr->lac != GSM_LAC_RESERVED_DETACHED)
return;
subscr_update(conn->subscr, conn->bts,
GSM_SUBSCRIBER_UPDATE_ATTACHED);
}
static int _gsm48_rx_mm_serv_req_sec_cb(
unsigned int hooknum, unsigned int event,
struct msgb *msg, void *data, void *param)
@ -822,11 +837,13 @@ static int _gsm48_rx_mm_serv_req_sec_cb(
case GSM_SECURITY_NOAVAIL:
case GSM_SECURITY_ALREADY:
rc = gsm48_tx_mm_serv_ack(conn);
implit_attach(conn);
break;
case GSM_SECURITY_SUCCEEDED:
/* nothing to do. CIPHER MODE COMMAND is
* implicit CM SERV ACK */
implit_attach(conn);
break;
default:
@ -897,10 +914,6 @@ static int gsm48_rx_mm_serv_req(struct gsm_subscriber_connection *conn, struct m
if (!subscr)
return gsm48_tx_mm_serv_rej(conn,
GSM48_REJECT_IMSI_UNKNOWN_IN_HLR);
if (subscr->lac == GSM_LAC_RESERVED_DETACHED)
/* If the subscriber is not attached, reject service */
return gsm48_tx_mm_serv_rej(conn,
GSM48_REJECT_IMSI_UNKNOWN_IN_VLR);
if (!conn->subscr)
conn->subscr = subscr;