implement support for 3-digit MNC with leading zeros

Add 3-digit flags and use the new RAI and LAI API from libosmocore throughout
the code base to be able to handle an MNC < 100 that has three digits (leading
zeros).

Depends: Id2240f7f518494c9df6c8bda52c0d5092f90f221 (libosmocore),
         Ib7176b1d65a03b76f41f94bc9d3293a8a07d24c6 (libosmocore)
Change-Id: I82f0016d9512ee8722a3489a3cb4b6c704a271fc

include/osmocom/msc/gsm_data.h

@@ -223,11 +223,11 @@ struct gsm_network {
 	 * these have in common, like country and network code, put in yet
 	 * separate structs and placed as members in osmo_bsc and osmo_msc. */
 
-	/* global parameters */
-	uint16_t country_code;
-	uint16_t network_code;
+	struct osmo_plmn_id plmn;
+
 	char *name_long;
 	char *name_short;
+
 	/* bit-mask of permitted encryption algorithms. LSB=A5/0, MSB=A5/7 */
 	uint8_t a5_encryption_mask;
 	bool authentication_required;

src/libcommon-cs/common_cs.c

@@ -45,8 +45,8 @@ struct gsm_network *gsm_network_init(void *ctx, mncc_recv_cb_t mncc_recv)
 	if (!net)
 		return NULL;
 
-	net->country_code = 1;
-	net->network_code = 1;
+	net->plmn = (struct osmo_plmn_id){ .mcc=1, .mnc=1 };
+
 	/* Permit a compile-time default of A5/3 and A5/1 */
 	net->a5_encryption_mask = (1 << 3) | (1 << 1);
 

src/libcommon-cs/common_cs_vty.c

@@ -61,7 +61,7 @@ DEFUN(cfg_net_ncc,
 {
 	struct gsm_network *gsmnet = gsmnet_from_vty(vty);
 
-	gsmnet->country_code = atoi(argv[0]);
+	gsmnet->plmn.mcc = atoi(argv[0]);
 
 	return CMD_SUCCESS;
 }
@@ -75,8 +75,16 @@ DEFUN(cfg_net_mnc,
       "Mobile Network Code to use\n")
 {
 	struct gsm_network *gsmnet = gsmnet_from_vty(vty);
+	uint16_t mnc;
+	bool mnc_3_digits;
 
-	gsmnet->network_code = atoi(argv[0]);
+	if (osmo_mnc_from_str(argv[0], &mnc, &mnc_3_digits)) {
+		vty_out(vty, "%% Error decoding MNC: %s%s", argv[0], VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	gsmnet->plmn.mnc = mnc;
+	gsmnet->plmn.mnc_3_digits = mnc_3_digits;
 
 	return CMD_SUCCESS;
 }

src/libmsc/a_iface_bssap.c

@@ -263,9 +263,7 @@ static int bssmap_rx_l3_compl(struct osmo_sccp_user *scu, const struct a_conn_in
 		struct gsm48_loc_area_id lai;
 		uint16_t ci;
 	} __attribute__ ((packed)) lai_ci;
-	uint16_t mcc;
-	uint16_t mnc;
-	uint16_t lac;
+	struct osmo_location_area_id lai;
 	uint8_t data_length;
 	const uint8_t *data;
 	int rc;
@@ -301,18 +299,15 @@ static int bssmap_rx_l3_compl(struct osmo_sccp_user *scu, const struct a_conn_in
 		     "Unable to parse element CELL IDENTIFIER (wrong cell identification discriminator) -- discarding message!\n");
 		return -EINVAL;
 	}
-	if (gsm48_decode_lai(&lai_ci.lai, &mcc, &mnc, &lac) != 0) {
-		LOGP(DBSSAP, LOGL_ERROR,
-		     "Unable to parse element CELL IDENTIFIER (lai decoding failed) -- discarding message!\n");
-		return -EINVAL;
-	}
+	gsm48_decode_lai2(&lai_ci.lai, &lai);
+	/* FIXME: Actually compare the MCC-MNC to the local network config?? */
 
 	/* Parse Layer 3 Information element */
 	msg->l3h = (uint8_t*)TLVP_VAL(tp, GSM0808_IE_LAYER_3_INFORMATION);
 	msgb_l3trim(msg, TLVP_LEN(tp, GSM0808_IE_LAYER_3_INFORMATION));
 
 	/* Create new subscriber context */
-	conn = subscr_conn_allocate_a(a_conn_info, network, lac, scu, a_conn_info->conn_id);
+	conn = subscr_conn_allocate_a(a_conn_info, network, lai.lac, scu, a_conn_info->conn_id);
 
 	/* Handover location update to the MSC code */
 	rc = msc_compl_l3(conn, msg, 0);

src/libmsc/gsm_04_08.c

@@ -222,15 +222,17 @@ static int gsm0408_loc_upd_acc(struct gsm_subscriber_connection *conn,
 	struct gsm48_hdr *gh;
 	struct gsm48_loc_area_id *lai;
 	uint8_t *mid;
+	struct osmo_location_area_id laid = {
+		.plmn = conn->network->plmn,
+		.lac = conn->lac,
+	};
 
 	gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
 	gh->proto_discr = GSM48_PDISC_MM;
 	gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT;
 
 	lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai));
-	gsm48_generate_lai(lai, conn->network->country_code,
-			   conn->network->network_code,
-			   conn->lac);
+	gsm48_generate_lai2(lai, &laid);
 
 	if (send_tmsi == GSM_RESERVED_TMSI) {
 		/* we did not allocate a TMSI to the MS, so we need to
@@ -381,10 +383,8 @@ int mm_rx_loc_upd_req(struct gsm_subscriber_connection *conn, struct msgb *msg)
 		break;
 	}
 
-	gsm48_decode_lai(&lu->lai, &old_lai.plmn.mcc,
-			 &old_lai.plmn.mnc, &old_lai.lac);
-	new_lai.plmn.mcc = conn->network->country_code;
-	new_lai.plmn.mnc = conn->network->network_code;
+	gsm48_decode_lai2(&lu->lai, &old_lai);
+	new_lai.plmn = conn->network->plmn;
 	new_lai.lac = conn->lac;
 	DEBUGP(DMM, "LU/new-LAC: %u/%u\n", old_lai.lac, new_lai.lac);
 
@@ -701,8 +701,7 @@ int gsm48_rx_mm_serv_req(struct gsm_subscriber_connection *conn, struct msgb *ms
 	bool is_utran;
 	int rc;
 
-	lai.plmn.mcc = conn->network->country_code;
-	lai.plmn.mnc = conn->network->network_code;
+	lai.plmn = conn->network->plmn;
 	lai.lac = conn->lac;
 
 	DEBUGP(DMM, "<- CM SERVICE REQUEST ");
@@ -1152,8 +1151,7 @@ static int gsm48_rx_rr_pag_resp(struct gsm_subscriber_connection *conn, struct m
 	struct osmo_location_area_id lai;
 	bool is_utran;
 
-	lai.plmn.mcc = conn->network->country_code;
-	lai.plmn.mnc = conn->network->network_code;
+	lai.plmn = conn->network->plmn;
 	lai.lac = conn->lac;
 
 	resp = (struct gsm48_pag_resp *) &gh->data[0];

src/libmsc/msc_vty.c

@@ -183,8 +183,9 @@ static int config_write_net(struct vty *vty)
 	int i;
 
 	vty_out(vty, "network%s", VTY_NEWLINE);
-	vty_out(vty, " network country code %u%s", gsmnet->country_code, VTY_NEWLINE);
-	vty_out(vty, " mobile network code %u%s", gsmnet->network_code, VTY_NEWLINE);
+	vty_out(vty, " network country code %s%s", osmo_mcc_name(gsmnet->plmn.mcc), VTY_NEWLINE);
+	vty_out(vty, " mobile network code %s%s",
+		osmo_mnc_name(gsmnet->plmn.mnc, gsmnet->plmn.mnc_3_digits), VTY_NEWLINE);
 	vty_out(vty, " short name %s%s", gsmnet->name_short, VTY_NEWLINE);
 	vty_out(vty, " long name %s%s", gsmnet->name_long, VTY_NEWLINE);
 	vty_out(vty, " encryption a5");

src/libvlr/vlr_lu_fsm.c

@@ -911,14 +911,6 @@ static int assoc_lfp_with_sub(struct osmo_fsm_inst *fi, struct vlr_subscr *vsub)
 	return 0;
 }
 
-static const char *lai_name(struct osmo_location_area_id *lai)
-{
-	static char buf[64];
-	snprintf(buf, sizeof(buf),"MCC:%u, MNC:%u, LAC:%u",
-		 lai->plmn.mcc, lai->plmn.mnc, lai->lac);
-	return buf;
-}
-
 static int _lu_fsm_associate_vsub(struct osmo_fsm_inst *fi)
 {
 	struct lu_fsm_priv *lfp = fi->priv;
@@ -988,7 +980,7 @@ static void _start_lu_main(struct osmo_fsm_inst *fi)
 #endif
 		LOGPFSML(fi, LOGL_NOTICE, "LAI change from %s,"
 			 " but checking previous VLR not implemented\n",
-			 lai_name(&lfp->old_lai));
+			 osmo_lai_name(&lfp->old_lai));
 	}
 
 	/* If this is a TMSI based LU, we may not have the IMSI. Make sure that

src/osmo-msc/msc_main.c

@@ -281,9 +281,7 @@ static int rcvmsg_iu_cs(struct msgb *msg, struct gprs_ra_id *ra_id, uint16_t *sa
 {
 	DEBUGP(DIUCS, "got IuCS message %d bytes: %s\n", msg->len, msgb_hexdump(msg));
 	if (ra_id) {
-		DEBUGP(DIUCS, "got IuCS message on"
-		       " MNC %d MCC %d LAC %d RAC %d\n",
-		       ra_id->mnc, ra_id->mcc, ra_id->lac, ra_id->rac);
+		DEBUGP(DIUCS, "got IuCS message on %s\n", osmo_rai_name(ra_id));
 	}
 
 	return gsm0408_rcvmsg_iucs(msc_network, msg, ra_id? &ra_id->lac : NULL);