filter: Move the gsm 04.08 filter to a common place

For customer requirements we want to be able to do
filtering on the BSC as well. The same messages need
to be scanned and the same access-lists will be looked
at. In the future we might even split traffic based
on the IMSI. Begin with moving the code to a new top
level directory and then renaming and removing the
nat dependency.

openbsc/configure.ac

@@ -179,6 +179,7 @@ AC_OUTPUT(
     src/libmsc/Makefile
     src/libmgcp/Makefile
     src/libcommon/Makefile
+    src/libfilter/Makefile
     src/osmo-nitb/Makefile
     src/osmo-bsc/Makefile
     src/osmo-bsc_nat/Makefile

openbsc/src/Makefile.am

@@ -2,7 +2,7 @@ AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
 AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(COVERAGE_CFLAGS)
 AM_LDFLAGS = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(COVERAGE_LDFLAGS)
 
-SUBDIRS = libcommon libmgcp libbsc libmsc libtrau osmo-nitb osmo-bsc_mgcp utils ipaccess gprs
+SUBDIRS = libcommon libmgcp libbsc libmsc libtrau libfilter osmo-nitb osmo-bsc_mgcp utils ipaccess gprs
 
 # Conditional modules
 if BUILD_NAT

openbsc/src/libfilter/Makefile.am

@@ -0,0 +1,9 @@
+AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
+AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS)
+
+noinst_LIBRARIES = libfilter.a
+
+libfilter_a_SOURCES = \
+	bsc_msg_filter.c
+

openbsc/src/osmo-bsc_nat/Makefile.am

@@ -7,12 +7,13 @@ bin_PROGRAMS = osmo-bsc_nat
 
 osmo_bsc_nat_SOURCES = bsc_filter.c bsc_mgcp_utils.c bsc_nat.c bsc_nat_utils.c \
 		  bsc_nat_vty.c bsc_sccp.c bsc_ussd.c bsc_nat_ctrl.c \
-		  bsc_nat_rewrite.c bsc_nat_filter.c bsc_nat_rewrite_trie.c
+		  bsc_nat_rewrite.c bsc_nat_rewrite_trie.c
 osmo_bsc_nat_LDADD = \
 		$(top_builddir)/src/libmgcp/libmgcp.a \
 		$(top_builddir)/src/libbsc/libbsc.a \
 		$(top_builddir)/src/libtrau/libtrau.a \
 		$(top_builddir)/src/libcommon/libcommon.a \
+		$(top_builddir)/src/libfilter/libfilter.a \
 		-lrt $(LIBOSMOSCCP_LIBS) $(LIBOSMOCORE_LIBS) \
 		$(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) $(LIBOSMOCTRL_LIBS) \
 		$(LIBOSMOABIS_LIBS) $(LIBOSMONETIF_LIBS)

openbsc/tests/bsc-nat/Makefile.am

@@ -10,11 +10,12 @@ bsc_nat_test_SOURCES = bsc_nat_test.c \
 			$(top_srcdir)/src/osmo-bsc_nat/bsc_filter.c \
 			$(top_srcdir)/src/osmo-bsc_nat/bsc_sccp.c \
 			$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_utils.c \
-			$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_filter.c \
 			$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_rewrite.c \
 			$(top_srcdir)/src/osmo-bsc_nat/bsc_nat_rewrite_trie.c \
 			$(top_srcdir)/src/osmo-bsc_nat/bsc_mgcp_utils.c
-bsc_nat_test_LDADD = $(top_builddir)/src/libbsc/libbsc.a \
+bsc_nat_test_LDADD = \
+			$(top_builddir)/src/libfilter/libfilter.a \
+			$(top_builddir)/src/libbsc/libbsc.a \
 			$(top_builddir)/src/libmgcp/libmgcp.a \
 			$(top_builddir)/src/libtrau/libtrau.a \
 			$(top_builddir)/src/libcommon/libcommon.a \