[gprs] Build the SGSN stand-alone and not as part of bsc_hack

Instead of continuing to add more and more functionality to the
bsc_hack binary, we should have the new SGSN code run as a separate
executable.

After this commit we now build a 'osmo_sgsn' executable, using its
own osmo_sgsn.cfg config file.

However, the SGSN is not yet functional, mainly due to the fact that
the BSSGP and GMM code are written with the assumption that there
is a msgb->trx->bts and the according 'sturct gsm_bts' data model
around - which clearly is no longer the case outside of bsc_hack.

1 files changed, 30 insertions, 0 deletions

diff --git a/openbsc/include/openbsc/sgsn.h b/openbsc/include/openbsc/sgsn.h
new file mode 100644
index 000000000..2dc53c13d
--- /dev/null
+++ b/openbsc/include/openbsc/sgsn.h
@@ -0,0 +1,30 @@
+#ifndef _SGSN_H
+#define _SGSN_H
+
+#include <sys/types.h>
+
+#include <osmocore/msgb.h>
+
+#include <openbsc/gprs_ns.h>
+
+struct sgsn_config {
+	/* parsed from config file */
+	u_int32_t nsip_listen_ip;
+	u_int16_t nsip_listen_port;
+
+	/* misc */
+	struct gprs_ns_inst *nsi;
+};
+
+
+/* sgsn_vty.c */
+
+int sgsn_vty_init(void);
+int sgsn_parse_config(const char *config_file, struct sgsn_config *cfg);
+
+/* sgsn.c */
+
+/* Main input function for Gb proxy */
+int sgsn_rcvmsg(struct msgb *msg, struct gprs_nsvc *nsvc, uint16_t ns_bvci);
+
+#endif