gluon-radv-filterd: Add respondd module reporting the chosen gateway

package/gluon-radv-filterd/Makefile

@@ -12,11 +12,7 @@ define Package/gluon-radv-filterd
   SECTION:=gluon
   CATEGORY:=Gluon
   TITLE:=Filter IPv6 router advertisements
-  DEPENDS:=+gluon-ebtables
-endef
-
-define Package/gluon-radv-filterd/description
-	Gluon community wifi mesh firmware framework: filter IPv6 router advertisements
+  DEPENDS:=+gluon-ebtables +libgluonutil
 endef
 
 define Build/Prepare
@@ -38,6 +34,9 @@ define Package/gluon-radv-filterd/install
 
 	$(INSTALL_DIR) $(1)/usr/sbin/
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/gluon-radv-filterd $(1)/usr/sbin/
+
+	$(INSTALL_DIR) $(1)/lib/gluon/respondd
+	$(CP) $(PKG_BUILD_DIR)/respondd.so $(1)/lib/gluon/respondd/radv-filterd.so
 endef
 
 define Package/gluon-radv-filterd/postinst

package/gluon-radv-filterd/src/Makefile

@@ -1,4 +1,7 @@
-all: gluon-radv-filterd
+all: gluon-radv-filterd respondd.so
 
 gluon-radv-filterd: gluon-radv-filterd.c
 	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -Wall -o $@ $^ $(LDLIBS)
+
+respondd.so: respondd.c
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -shared -fPIC -D_GNU_SOURCE -o $@ $^ $(LDLIBS) -lgluonutil

package/gluon-radv-filterd/src/gluon-radv-filterd.c

@@ -45,12 +45,13 @@
 
 #include <linux/filter.h>
 #include <linux/if_packet.h>
-#include <linux/if_ether.h>
 #include <linux/limits.h>
 
 #include <netinet/icmp6.h>
 #include <netinet/ip6.h>
 
+#include "mac.h"
+
 // Recheck TQs after this time even if no RA was received
 #define MAX_INTERVAL 60
 
@@ -72,10 +73,6 @@
 #define TRANSTABLE_GLOBAL DEBUGFS "transtable_global"
 #define TRANSTABLE_LOCAL DEBUGFS "transtable_local"
 
-#define F_MAC "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx"
-#define F_MAC_IGN "%*2x:%*2x:%*2x:%*2x:%*2x:%*2x"
-#define F_MAC_VAR(var) var[0], var[1], var[2], var[3], var[4], var[5]
-
 #ifdef DEBUG
 #define CHECK(stmt) \
     if(!(stmt)) { \
@@ -92,8 +89,6 @@
 #define ARRAY_SIZE(A) (sizeof(A)/sizeof(A[0]))
 #endif
 
-typedef uint8_t macaddr_t[ETH_ALEN];
-
 struct list_item {
 	struct list *next;
 };

package/gluon-radv-filterd/src/mac.h

@@ -0,0 +1,8 @@
+#include <stdint.h>
+#include <linux/if_ether.h>
+
+#define F_MAC "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx"
+#define F_MAC_IGN "%*2x:%*2x:%*2x:%*2x:%*2x:%*2x"
+#define F_MAC_VAR(var) var[0], var[1], var[2], var[3], var[4], var[5]
+
+typedef uint8_t macaddr_t[ETH_ALEN];

package/gluon-radv-filterd/src/respondd.c

@@ -0,0 +1,45 @@
+#include <respondd.h>
+
+#include <json-c/json.h>
+#include <libgluonutil.h>
+#include <stdio.h>
+
+#include "mac.h"
+
+static struct json_object * get_radv_filter() {
+	FILE *f = popen("exec ebtables -L RADV_FILTER", "r");
+	char *line = NULL;
+	size_t len = 0;
+	macaddr_t mac = { 0 };
+	struct json_object *ret = NULL;
+
+	if (!f)
+		return NULL;
+
+	while (getline(&line, &len, f) > 0) {
+		if (sscanf(line, "-s " F_MAC " -j ACCEPT\n", F_MAC_VAR(&mac)) == ETH_ALEN)
+			break;
+	}
+
+	pclose(f);
+
+	sprintf(line, F_MAC, F_MAC_VAR(mac));
+	ret = gluonutil_wrap_string(line);
+	free(line);
+	return ret;
+}
+
+static struct json_object * respondd_provider_statistics() {
+	struct json_object *ret = json_object_new_object();
+
+	struct json_object *radv_filter = get_radv_filter();
+	if (radv_filter)
+		json_object_object_add(ret, "gateway6", radv_filter);
+
+	return ret;
+}
+
+const struct respondd_provider_info respondd_providers[] = {
+	{"statistics", respondd_provider_statistics},
+	{}
+};