eap: Add dynamic EAP method registration

src/eap.c

@@ -412,15 +412,54 @@ int eap_unregister_method(struct eap_method *method)
 	return -ENOENT;
 }
 
-void eap_init(void) {
-	eap_methods = l_queue_new();
+static void __eap_method_enable(struct eap_method_desc *start,
+					struct eap_method_desc *stop)
+{
+        struct eap_method_desc *desc;
 
-	eap_register_method(&eap_md5);
-	eap_register_method(&eap_tls);
-	eap_register_method(&eap_ttls);
+	l_debug("");
+
+	if (start == NULL || stop == NULL)
+		return;
+
+	for (desc = start; desc < stop; desc++) {
+		if (!desc->init)
+			continue;
+
+		desc->init();
+	}
 }
 
-void eap_exit(void) {
+static void __eap_method_disable(struct eap_method_desc *start,
+					struct eap_method_desc *stop)
+{
+        struct eap_method_desc *desc;
+
+	l_debug("");
+
+	if (start == NULL || stop == NULL)
+		return;
+
+	for (desc = start; desc < stop; desc++) {
+		if (!desc->exit)
+			continue;
+
+		desc->exit();
+	}
+}
+
+extern struct eap_method_desc __start___eap[];
+extern struct eap_method_desc __stop___eap[];
+
+void eap_init(void)
+{
+	eap_methods = l_queue_new();
+	__eap_method_enable(__start___eap, __stop___eap);
+}
+
+void eap_exit(void)
+{
+	__eap_method_disable(__start___eap, __stop___eap);
 	l_queue_destroy(eap_methods, NULL);
 }
 

src/eap.h

@@ -95,6 +95,18 @@ struct eap_method {
 				const uint8_t *pkt, size_t len);
 };
 
+struct eap_method_desc {
+	const char *name;
+	int (*init)(void);
+	void (*exit)(void);
+} __attribute__((aligned(8)));
+
+#define EAP_METHOD_BUILTIN(name, init, exit)				\
+	static struct eap_method_desc __eap_builtin_ ## name		\
+		__attribute__((used, section("__eap"), aligned(8))) = {	\
+			#name, init, exit				\
+		};							\
+
 int eap_register_method(struct eap_method *method);
 int eap_unregister_method(struct eap_method *method);
 
@@ -117,7 +129,3 @@ void eap_method_error(struct eap_state *eap);
 
 void eap_save_last_id(struct eap_state *eap, uint8_t *last_id);
 void eap_restore_last_id(struct eap_state *eap, uint8_t last_id);
-
-extern struct eap_method eap_md5;
-extern struct eap_method eap_tls;
-extern struct eap_method eap_ttls;