sgsn: add a minimalistic ACL
This adds a minimalistic ACL by which certain, individual roaming IMSIs
can be authorized to use the SGSN. So you can selectively bypass the
'MCC+MNC == first 5 digits of IMSI' checking for a couple of IMSIs
diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index bb61ab5..36798e0 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -698,7 +698,8 @@
* as long as it is part of 'our' network */
char mccmnc[16];
snprintf(mccmnc, sizeof(mccmnc), "%03d%02d", ra_id.mcc, ra_id.mnc);
- if (strncmp(mccmnc, mi_string, 5)) {
+ if (strncmp(mccmnc, mi_string, 5) &&
+ !sgsn_acl_lookup(mi_string)) {
LOGP(DMM, LOGL_INFO, "Rejecting ATTACH REQUESET IMSI=%s\n",
mi_string);
return gsm48_tx_gmm_att_rej_oldmsg(msg,