diff options
| author | Harald Welte <laforge@gnumonks.org> | 2010-12-24 15:39:08 +0100 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2010-12-24 15:42:26 +0100 |
| commit | eafe22ca7290280fca0f8d31d70239fd0b0dbb9d (patch) | |
| tree | 0fc0757956c1f7dc0963c90e6f367d70914709f6 /openbsc/src/gprs | |
| parent | 2cafc4b30910f244e610e4cf75f72ba360df6ace (diff) | |
SGSN / GMM: Only allow non-roaming IMSIs
As we do not yet use the HLR from the SGSN, we allow all MS to
attach to our GPRS network. However, if this is running in a public
environment, it could cause service interruption to users of commercial
GPRS networks.
Thus, we now check if the first 5 digits of the IMSI match the MCC/MNC
of the cell that they want to register to. Thus, any subscribers with
SIM cards from real operators will no longer be accepted.
Diffstat (limited to 'openbsc/src/gprs')
| -rw-r--r-- | openbsc/src/gprs/gprs_gmm.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c index 82a4ca85b..158f577a7 100644 --- a/openbsc/src/gprs/gprs_gmm.c +++ b/openbsc/src/gprs/gprs_gmm.c @@ -671,7 +671,16 @@ static int gsm48_rx_gmm_att_req(struct sgsn_mm_ctx *ctx, struct msgb *msg, #if 0 return gsm48_tx_gmm_att_rej(msg, GMM_CAUSE_IMSI_UNKNOWN); #else - /* As a temorary hack, we simply assume that the IMSI exists */ + /* As a temorary hack, we simply assume that the IMSI exists, + * 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)) { + LOGP(DMM, LOGL_INFO, "Rejecting ATTACH REQUESET IMSI=%s\n", + mi_string); + return gsm48_tx_gmm_att_rej_oldmsg(msg, + GMM_CAUSE_GPRS_NOTALLOWED); + } ctx = sgsn_mm_ctx_alloc(0, &ra_id); if (!ctx) return gsm48_tx_gmm_att_rej_oldmsg(msg, GMM_CAUSE_NET_FAIL); |