nat: Extract the LAC/CI from the Complete Layer3 Information

Find the Cell Identifier from the Complete Layer3 Information and
store it for future reference. We could begin to verify that the
LAC/CI used really belongs to the BSC.
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat.c b/openbsc/src/osmo-bsc_nat/bsc_nat.c
index 21f5287..0496802 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat.c
@@ -1,8 +1,8 @@
 /* BSC Multiplexer/NAT */
 
 /*
- * (C) 2010-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
- * (C) 2010-2012 by On-Waves
+ * (C) 2010-2013 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2010-2013 by On-Waves
  * (C) 2009 by Harald Welte <laforge@gnumonks.org>
  * All Rights Reserved
  *
@@ -1056,6 +1056,7 @@
 			con_msc = con->msc_con;
 			con->con_type = con_type;
 			con->imsi_checked = filter;
+			bsc_nat_extract_lac(bsc, con, parsed, msg);
 			if (imsi)
 				con->imsi = talloc_steal(con, imsi);
 			imsi = NULL;