Move lots of Iu/ranap specific code into its own file
RANAP related functionalities were splitted among several files
(gprs_gmm.c, gprs_sgsn.c and sgsn_libgtp.c). Let's move it into its own
file to shrink complexity/size of existing files.
It also allows to keep a lot of conditionally enabled code (BUILD_IU)
and its dependencies (osmo-iuh) together.
Change-Id: I549042aaff045a378de77d657cc396ee08f22f33
diff --git a/include/osmocom/sgsn/gprs_ranap.h b/include/osmocom/sgsn/gprs_ranap.h
new file mode 100644
index 0000000..b300130
--- /dev/null
+++ b/include/osmocom/sgsn/gprs_ranap.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/sgsn/gprs_sgsn.h>
+
+#ifdef BUILD_IU
+#include <osmocom/ranap/ranap_ies_defs.h>
+#include <osmocom/ranap/ranap_msg_factory.h>
+#include <osmocom/ranap/iu_client.h>
+
+void activate_pdp_rabs(struct sgsn_mm_ctx *ctx);
+int sgsn_ranap_iu_event(struct ranap_ue_conn_ctx *ctx, enum ranap_iu_event_type type, void *data);
+int iu_rab_act_ps(uint8_t rab_id, struct sgsn_pdp_ctx *pdp);
+
+int gsm0408_gprs_rcvmsg_iu(struct msgb *msg, struct gprs_ra_id *ra_id, uint16_t *sai);
+#endif
+
+struct ranap_ue_conn_ctx;
+/* On RANAP, Returns pointer to he associated ranap_ue_conn_ctx in msg, filled
+ * in by osmo-iuh's iu_recv_cb().
+ * On Gb, returns NULL */
+#define MSG_IU_UE_CTX(msg) ((struct ranap_ue_conn_ctx *)(msg)->dst)
+#define MSG_IU_UE_CTX_SET(msg, val) (msg)->dst = (val)