sgsn: Give the IMEI to the GGSN for analysis
Most SGSNs pass the IMEI(SV). We currently only enquire about
the IMEI and then pad the 'SV' with 1111b (thanks to the encoding
routine). Sadly it insists on always writing the length which
means we have to memmove the data around by a single octet.
Manually verified using the pcu-emu and looking at the trace
using wireshark.
diff --git a/openbsc/src/gprs/sgsn_libgtp.c b/openbsc/src/gprs/sgsn_libgtp.c
index 008ec1e..a96eb5c 100644
--- a/openbsc/src/gprs/sgsn_libgtp.c
+++ b/openbsc/src/gprs/sgsn_libgtp.c
@@ -237,6 +237,12 @@
pdp->userloc.v[0] = 0; /* CGI for GERAN */
bssgp_create_cell_id(&pdp->userloc.v[1], &mmctx->ra, mmctx->cell_id);
+ /* include the IMEI(SV) */
+ pdp->imeisv_given = 1;
+ gsm48_encode_bcd_number(&pdp->imeisv.v[0], 8, 0, mmctx->imei);
+ pdp->imeisv.l = pdp->imeisv.v[0];
+ memmove(&pdp->imeisv.v[0], &pdp->imeisv.v[1], 8);
+
/* change pdp state to 'requested' */
pctx->state = PDP_STATE_CR_REQ;