hnbgw: Add SUA client socket towards localhost

This socket doesn't do much yet except to connect to localhost:14001

The host/port needs to be made configurable, and the RUA<->SUA
interfacing needs to be implemented.

Also, we'll need two SUA sockets, one for MSC and one for SGSN.

configure.ac

@@ -18,6 +18,7 @@ AC_PROG_RANLIB
 PKG_CHECK_MODULES(OSMOCORE, libosmocore)
 PKG_CHECK_MODULES(OSMOGSM, libosmogsm)
 PKG_CHECK_MODULES(OSMOVTY, libosmovty)
+PKG_CHECK_MODULES(OSMOSIGTRAN, libosmo-sigtran)
 PKG_CHECK_MODULES(ASN1C, libasn1c)
 
 AC_CONFIG_MACRO_DIR([m4])

src/Makefile.am

@@ -3,13 +3,13 @@ SUBDIRS = hnbap rua ranap tests
 ASN1_ROOT = $(top_builddir)/asn1/
 ASN1TOSTRUCT = $(ASN1_ROOT)/utils/asn1tostruct.py
 
-AM_CFLAGS = $(OSMOCORE_CFLAGS) $(OSMOVTY_CFLAGS) $(OSMOGSM_CFLAGS) $(ASN1C_CFLAGS) -Ihnbap/
+AM_CFLAGS = $(OSMOCORE_CFLAGS) $(OSMOVTY_CFLAGS) $(OSMOGSM_CFLAGS) $(ASN1C_CFLAGS) $(OSMOSIGTRAN_CFLAGS) -Ihnbap/
 COMMON_LDADD = -lsctp
 
 bin_PROGRAMS = hnbgw
 
 hnbgw_SOURCES = hnbap_encoder.c hnbap_decoder.c rua_encoder.c rua_decoder.c ranap_common.c rua_common.c hnbap_common.c iu_helpers.c asn1helpers.c hnbgw.c hnbgw_hnbap.c hnbgw_rua.c hnbgw_ranap.c ranap_decoder.c ranap_encoder.c ranap_msg_factory.c
-hnbgw_LDADD = $(OSMOCORE_LIBS) $(OSMOVTY_LIBS) $(OSMOGSM_LIBS) $(ASN1C_LIBS) $(COMMON_LDADD) hnbap/libosmo-asn1-hnbap.a rua/libosmo-asn1-rua.a ranap/libosmo-asn1-ranap.a
+hnbgw_LDADD = $(OSMOCORE_LIBS) $(OSMOVTY_LIBS) $(OSMOGSM_LIBS) $(ASN1C_LIBS) $(OSMOSIGTRAN_LIBS) $(COMMON_LDADD) hnbap/libosmo-asn1-hnbap.a rua/libosmo-asn1-rua.a ranap/libosmo-asn1-ranap.a
 
 BUILT_SOURCES = hnbap_decoder.c hnbap_encoder.c rua_decoder.c rua_encoder.c ranap_decoder.c ranap_encoder.c
 

src/hnbgw.c

@@ -44,12 +44,17 @@
 #include <osmocom/vty/logging.h>
 #include <osmocom/vty/command.h>
 
+#include <osmocom/sigtran/sua.h>
+#include <osmocom/sigtran/protocol/sua.h>
+#include <osmocom/sigtran/sccp_sap.h>
+
 #include "hnbgw.h"
 #include "hnbgw_hnbap.h"
 #include "hnbgw_rua.h"
 
 static void *tall_hnb_ctx;
 static void *tall_ue_ctx;
+static void *tall_sua_ctx;
 void *talloc_asn1_ctx;
 
 struct hnb_gw g_hnb_gw = {
@@ -237,6 +242,20 @@ static int listen_fd_cb(struct osmo_fd *fd, unsigned int what)
 	return 0;
 }
 
+/* Entry point for primitives coming up from SCCP User SAP */
+static int sccp_sap_up(struct osmo_prim_hdr *oph, void *link)
+{
+	struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph;
+
+	LOGP(DMAIN, LOGL_DEBUG, "sccp_sap_up(%s)\n", osmo_scu_prim_name(oph));
+
+	/* FIXME: Do something */
+
+	msgb_free(oph->msg);
+
+	return 0;
+}
+
 static const struct log_info_cat log_cat[] = {
 	[DMAIN] = {
 		.name = "DMAIN", .loglevel = LOGL_INFO, .enabled = 1,
@@ -248,6 +267,11 @@ static const struct log_info_cat log_cat[] = {
 		.color = "",
 		.description = "Home Node B Application Part",
 	},
+	[DSUA] = {
+		.name = "DSUA", .loglevel = LOGL_DEBUG, .enabled = 1,
+		.color = "",
+		.description = "SCCP User Adaptation",
+	},
 };
 
 static const struct log_info hnbgw_log_info = {
@@ -328,10 +352,13 @@ static void hnbgw_vty_init(void)
 
 int main(int argc, char **argv)
 {
+	struct osmo_sua_user *sua_user;
+	struct osmo_sua_link *sua_link;
 	int rc;
 
 	tall_hnb_ctx = talloc_named_const(NULL, 0, "hnb_context");
 	tall_ue_ctx = talloc_named_const(NULL, 0, "ue_context");
+	tall_sua_ctx = talloc_named_const(NULL, 0, "sua");
 	talloc_asn1_ctx = talloc_named_const(NULL, 0, "asn1_context");
 
 	g_hnb_gw.listen_fd.cb = listen_fd_cb;
@@ -354,6 +381,23 @@ int main(int argc, char **argv)
 		exit(1);
 	}
 
+	osmo_sua_set_log_area(DSUA);
+	sua_user = osmo_sua_user_create(tall_sua_ctx, sccp_sap_up);
+	if (!sua_user) {
+		perror("Failed to init SUA");
+		exit(1);
+	}
+	rc = osmo_sua_client_connect(sua_user, "127.0.0.1", SUA_PORT);
+	if (rc < 0) {
+		perror("Failed to connect SUA");
+		exit(1);
+	}
+	sua_link = osmo_sua_client_get_link(sua_user);
+	if (!sua_link) {
+		perror("Failed to get SUA link");
+		exit(1);
+	}
+
 	rc = osmo_sock_init_ofd(&g_hnb_gw.listen_fd, AF_INET, SOCK_STREAM,
 			   IPPROTO_SCTP, NULL,
 			   g_hnb_gw.config.iuh_listen_port, OSMO_SOCK_F_BIND);

src/hnbgw.h

@@ -12,6 +12,7 @@
 enum {
 	DMAIN,
 	DHNBAP,
+	DSUA,
 };