sgsn: Clear LAC/RAC value for the routing area identity
Clear LAC/RAC with pre-defined value in the RAI.
3GPP 29.060 v7.17.0 section 7.3.1 page 23:
"The SGSN may include the Routeing Area Identity (RAI) of the
SGSN where the MS is registered. The MCC and MNC components shall
be populated with the MCC and MNC, respectively, of the SGSN
where the MS is registered. The LAC and RAC components shall be
populated by the SGSN with the value of 'FFFE' and 'FF',
respectively.”
diff --git a/openbsc/src/gprs/sgsn_libgtp.c b/openbsc/src/gprs/sgsn_libgtp.c
index a96eb5c..52d99aa 100644
--- a/openbsc/src/gprs/sgsn_libgtp.c
+++ b/openbsc/src/gprs/sgsn_libgtp.c
@@ -120,6 +120,7 @@
uint16_t nsapi,
struct tlv_parsed *tp)
{
+ struct gprs_ra_id raid;
struct sgsn_pdp_ctx *pctx;
struct pdp_t *pdp;
uint64_t imsi_ui64;
@@ -230,7 +231,10 @@
/* Include RAI and ULI all the time */
pdp->rai_given = 1;
pdp->rai.l = 6;
- gsm48_construct_ra(pdp->rai.v, &mmctx->ra);
+ raid = mmctx->ra;
+ raid.lac = 0xFFFE;
+ raid.rac = 0xFF;
+ gsm48_construct_ra(pdp->rai.v, &raid);
pdp->userloc_given = 1;
pdp->userloc.l = 8;