sgsn: Remove explicit sgsn_instance parameters

Currently the function in sgsn_auth.c either have an sgsn_config or
an sgsn_instance parameter. Since then global sgsn variable is
already being used in that file and since other parts of the SGSN
related code also rely on a global sgsn singleton, these parameters
pretend to provide a flexibility that is not really supported.

Therefore this patch removes these parameters except for the ACL
related functions, which do not call code that uses the sgsn
variable.

Sponsored-by: On-Waves ehf

openbsc/include/openbsc/gprs_sgsn.h

@@ -271,15 +271,14 @@ struct sgsn_config;
 struct sgsn_instance;
 extern const struct value_string *sgsn_auth_state_names;
 
-void sgsn_auth_init(struct sgsn_instance *sgi);
+void sgsn_auth_init(void);
 struct imsi_acl_entry *sgsn_acl_lookup(const char *imsi, struct sgsn_config *cfg);
 int sgsn_acl_add(const char *imsi, struct sgsn_config *cfg);
 int sgsn_acl_del(const char *imsi, struct sgsn_config *cfg);
 /* Request authorization */
-int sgsn_auth_request(struct sgsn_mm_ctx *mm, struct sgsn_config *cfg);
-enum sgsn_auth_state sgsn_auth_state(struct sgsn_mm_ctx *mm,
-				     struct sgsn_config *cfg);
-void sgsn_auth_update(struct sgsn_mm_ctx *mm, struct sgsn_instance *sgi);
+int sgsn_auth_request(struct sgsn_mm_ctx *mm);
+enum sgsn_auth_state sgsn_auth_state(struct sgsn_mm_ctx *mm);
+void sgsn_auth_update(struct sgsn_mm_ctx *mm);
 
 /* Called on subscriber data updates */
 void sgsn_update_subscriber_data(struct sgsn_mm_ctx *mmctx);

openbsc/src/gprs/gprs_gmm.c

@@ -647,7 +647,7 @@ static int gsm48_gmm_authorize(struct sgsn_mm_ctx *ctx)
 		 * sgsn_auth_update which in turn calls
 		 * gsm0408_gprs_access_granted or gsm0408_gprs_access_denied */
 
-		sgsn_auth_request(ctx, &sgsn->cfg);
+		sgsn_auth_request(ctx);
 		/* Note that gsm48_gmm_authorize can be called recursively via
 		 * sgsn_auth_request iff ctx->auth_info changes to AUTH_ACCEPTED
 		 */

openbsc/src/gprs/gprs_sgsn.c

@@ -455,5 +455,5 @@ void sgsn_update_subscriber_data(struct sgsn_mm_ctx *mmctx)
 {
 	OSMO_ASSERT(mmctx);
 
-	sgsn_auth_update(mmctx, sgsn);
+	sgsn_auth_update(mmctx);
 }

openbsc/src/gprs/sgsn_auth.c

@@ -34,9 +34,9 @@ const struct value_string auth_state_names[] = {
 
 const struct value_string *sgsn_auth_state_names = auth_state_names;
 
-void sgsn_auth_init(struct sgsn_instance *sgi)
+void sgsn_auth_init(void)
 {
-	INIT_LLIST_HEAD(&sgi->cfg.imsi_acl);
+	INIT_LLIST_HEAD(&sgsn->cfg.imsi_acl);
 }
 
 /* temporary IMSI ACL hack */
@@ -81,8 +81,7 @@ int sgsn_acl_del(const char *imsi, struct sgsn_config *cfg)
 	return 0;
 }
 
-enum sgsn_auth_state sgsn_auth_state(struct sgsn_mm_ctx *mmctx,
-				     struct sgsn_config *cfg)
+enum sgsn_auth_state sgsn_auth_state(struct sgsn_mm_ctx *mmctx)
 {
 	char mccmnc[16];
 	int check_net = 0;
@@ -125,22 +124,22 @@ enum sgsn_auth_state sgsn_auth_state(struct sgsn_mm_ctx *mmctx,
 	return SGSN_AUTH_REJECTED;
 }
 
-int sgsn_auth_request(struct sgsn_mm_ctx *mmctx, struct sgsn_config *cfg)
+int sgsn_auth_request(struct sgsn_mm_ctx *mmctx)
 {
 	/* TODO: Add remote subscriber update requests here */
 
-	sgsn_auth_update(mmctx, sgsn);
+	sgsn_auth_update(mmctx);
 
 	return 0;
 }
 
-void sgsn_auth_update(struct sgsn_mm_ctx *mmctx, struct sgsn_instance *sgi)
+void sgsn_auth_update(struct sgsn_mm_ctx *mmctx)
 {
 	enum sgsn_auth_state auth_state;
 
 	LOGMMCTXP(LOGL_DEBUG, mmctx, "Updating authorization\n");
 
-	auth_state = sgsn_auth_state(mmctx, &sgi->cfg);
+	auth_state = sgsn_auth_state(mmctx);
 	if (auth_state == SGSN_AUTH_UNKNOWN) {
 		/* Reject requests since remote updates are NYI */
 		LOGMMCTXP(LOGL_ERROR, mmctx,

openbsc/src/gprs/sgsn_main.c

@@ -345,7 +345,7 @@ int main(int argc, char **argv)
 	bssgp_vty_init();
 	gprs_llc_vty_init();
 	gprs_sndcp_vty_init();
-	sgsn_auth_init(&sgsn_inst);
+	sgsn_auth_init();
 	/* FIXME: register signal handler for SS_L_NS */
 
 	rc = sgsn_parse_config(sgsn_inst.config_file, &sgsn_inst.cfg);

openbsc/tests/sgsn/sgsn_test.c

@@ -798,7 +798,7 @@ int main(int argc, char **argv)
 	tall_bsc_ctx = talloc_named_const(NULL, 0, "osmo_sgsn");
 	tall_msgb_ctx = talloc_named_const(tall_bsc_ctx, 0, "msgb");
 
-	sgsn_auth_init(sgsn);
+	sgsn_auth_init();
 
 	test_llme();
 	test_gmm_detach();