hostapd: add ubus reload

Add ubus interface to hostapd and wpa_supplicant to allow dynamically
reloading wiface configuration without having to restart the hostapd
process.
As a consequence, both hostapd and wpa_supplicant are now started
persistently on boot for each wifi device in the system and then
receive ubus calls adding, modifying or removing interface
configuration.
At a later stage it would be desirable to reduce the services to one
single instance managing all radios.

Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 173 insertions, 3 deletions

diff --git a/package/network/services/hostapd/src/wpa_supplicant/ubus.c b/package/network/services/hostapd/src/wpa_supplicant/ubus.c
index 5fdb57be7a..9a98979e9a 100644
--- a/package/network/services/hostapd/src/wpa_supplicant/ubus.c
+++ b/package/network/services/hostapd/src/wpa_supplicant/ubus.c
@@ -20,6 +20,11 @@ static struct ubus_context *ctx;
 static struct blob_buf b;
 static int ctx_ref;
 
+static inline struct wpa_global *get_wpa_global_from_object(struct ubus_object *obj)
+{
+	return container_of(obj, struct wpa_global, ubus_global);
+}
+
 static inline struct wpa_supplicant *get_wpas_from_object(struct ubus_object *obj)
 {
 	return container_of(obj, struct wpa_supplicant, ubus.obj);
@@ -95,6 +100,19 @@ wpas_bss_get_features(struct ubus_context *ctx, struct ubus_object *obj,
 	return 0;
 }
 
+static int
+wpas_bss_reload(struct ubus_context *ctx, struct ubus_object *obj,
+		struct ubus_request_data *req, const char *method,
+		struct blob_attr *msg)
+{
+	struct wpa_supplicant *wpa_s = get_wpas_from_object(obj);
+
+	if (wpa_supplicant_reload_configuration(wpa_s))
+		return UBUS_STATUS_UNKNOWN_ERROR;
+	else
+		return 0;
+}
+
 #ifdef CONFIG_WPS
 enum {
 	WPS_START_MULTI_AP,
@@ -146,11 +164,12 @@ wpas_bss_wps_cancel(struct ubus_context *ctx, struct ubus_object *obj,
 #endif
 
 static const struct ubus_method bss_methods[] = {
+	UBUS_METHOD_NOARG("reload", wpas_bss_reload),
+	UBUS_METHOD_NOARG("get_features", wpas_bss_get_features),
 #ifdef CONFIG_WPS
 	UBUS_METHOD_NOARG("wps_start", wpas_bss_wps_start),
 	UBUS_METHOD_NOARG("wps_cancel", wpas_bss_wps_cancel),
 #endif
-	UBUS_METHOD_NOARG("get_features", wpas_bss_get_features),
 };
 
 static struct ubus_object_type bss_object_type =
@@ -162,8 +181,6 @@ void wpas_ubus_add_bss(struct wpa_supplicant *wpa_s)
 	char *name;
 	int ret;
 
-	if (!wpas_ubus_init())
-		return;
 
 	if (asprintf(&name, "wpa_supplicant.%s", wpa_s->ifname) < 0)
 		return;
@@ -192,6 +209,159 @@ void wpas_ubus_free_bss(struct wpa_supplicant *wpa_s)
 	free(name);
 }
 
+enum {
+	WPAS_CONFIG_DRIVER,
+	WPAS_CONFIG_IFACE,
+	WPAS_CONFIG_BRIDGE,
+	WPAS_CONFIG_HOSTAPD_CTRL,
+	WPAS_CONFIG_CTRL,
+	WPAS_CONFIG_FILE,
+	__WPAS_CONFIG_MAX
+};
+
+static const struct blobmsg_policy wpas_config_add_policy[__WPAS_CONFIG_MAX] = {
+	[WPAS_CONFIG_DRIVER] = { "driver", BLOBMSG_TYPE_STRING },
+	[WPAS_CONFIG_IFACE] = { "iface", BLOBMSG_TYPE_STRING },
+	[WPAS_CONFIG_BRIDGE] = { "bridge", BLOBMSG_TYPE_STRING },
+	[WPAS_CONFIG_HOSTAPD_CTRL] = { "hostapd_ctrl", BLOBMSG_TYPE_STRING },
+	[WPAS_CONFIG_CTRL] = { "ctrl", BLOBMSG_TYPE_STRING },
+	[WPAS_CONFIG_FILE] = { "config", BLOBMSG_TYPE_STRING },
+};
+
+static int
+wpas_config_add(struct ubus_context *ctx, struct ubus_object *obj,
+		struct ubus_request_data *req, const char *method,
+		struct blob_attr *msg)
+{
+	struct blob_attr *tb[__WPAS_CONFIG_MAX];
+	struct wpa_global *global = get_wpa_global_from_object(obj);
+	struct wpa_interface *iface;
+
+	blobmsg_parse(wpas_config_add_policy, __WPAS_CONFIG_MAX, tb, blob_data(msg), blob_len(msg));
+
+	if (!tb[WPAS_CONFIG_FILE] || !tb[WPAS_CONFIG_IFACE] || !tb[WPAS_CONFIG_DRIVER])
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	iface = os_zalloc(sizeof(struct wpa_interface));
+	if (iface == NULL)
+		return UBUS_STATUS_UNKNOWN_ERROR;
+
+	iface->driver = blobmsg_get_string(tb[WPAS_CONFIG_DRIVER]);
+	iface->ifname = blobmsg_get_string(tb[WPAS_CONFIG_IFACE]);
+	iface->confname = blobmsg_get_string(tb[WPAS_CONFIG_FILE]);
+
+	if (tb[WPAS_CONFIG_BRIDGE])
+		iface->bridge_ifname = blobmsg_get_string(tb[WPAS_CONFIG_BRIDGE]);
+
+	if (tb[WPAS_CONFIG_CTRL])
+		iface->ctrl_interface = blobmsg_get_string(tb[WPAS_CONFIG_CTRL]);
+
+	if (tb[WPAS_CONFIG_HOSTAPD_CTRL])
+		iface->hostapd_ctrl = blobmsg_get_string(tb[WPAS_CONFIG_HOSTAPD_CTRL]);
+
+	if (!wpa_supplicant_add_iface(global, iface, NULL))
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	return UBUS_STATUS_OK;
+}
+
+enum {
+	WPAS_CONFIG_REM_IFACE,
+	__WPAS_CONFIG_REM_MAX
+};
+
+static const struct blobmsg_policy wpas_config_remove_policy[__WPAS_CONFIG_REM_MAX] = {
+	[WPAS_CONFIG_REM_IFACE] = { "iface", BLOBMSG_TYPE_STRING },
+};
+
+static int
+wpas_config_remove(struct ubus_context *ctx, struct ubus_object *obj,
+		   struct ubus_request_data *req, const char *method,
+		   struct blob_attr *msg)
+{
+	struct blob_attr *tb[__WPAS_CONFIG_REM_MAX];
+	struct wpa_global *global = get_wpa_global_from_object(obj);
+	struct wpa_supplicant *wpa_s = NULL;
+	unsigned int found = 0;
+
+	blobmsg_parse(wpas_config_remove_policy, __WPAS_CONFIG_REM_MAX, tb, blob_data(msg), blob_len(msg));
+
+	if (!tb[WPAS_CONFIG_REM_IFACE])
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	/* find wpa_s object for to-be-removed interface */
+	for (wpa_s = global->ifaces; wpa_s; wpa_s = wpa_s->next) {
+		if (!strncmp(wpa_s->ifname,
+			     blobmsg_get_string(tb[WPAS_CONFIG_REM_IFACE]),
+			     sizeof(wpa_s->ifname)))
+		{
+			found = 1;
+			break;
+		}
+	}
+
+	if (!found)
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	if (wpa_supplicant_remove_iface(global, wpa_s, 0))
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	return UBUS_STATUS_OK;
+}
+
+static const struct ubus_method wpas_daemon_methods[] = {
+	UBUS_METHOD("config_add", wpas_config_add, wpas_config_add_policy),
+	UBUS_METHOD("config_remove", wpas_config_remove, wpas_config_remove_policy),
+};
+
+static struct ubus_object_type wpas_daemon_object_type =
+	UBUS_OBJECT_TYPE("wpa_supplicant", wpas_daemon_methods);
+
+void wpas_ubus_add(struct wpa_global *global)
+{
+	struct ubus_object *obj = &global->ubus_global;
+	int name_len;
+	int ret;
+
+	if (!wpas_ubus_init())
+		return;
+
+	name_len = strlen("wpa_supplicant") + 1;
+	if (global->params.name)
+		name_len += strlen(global->params.name) + 1;
+	obj->name = malloc(name_len);
+	strcpy(obj->name, "wpa_supplicant");
+
+	if (global->params.name)
+	{
+		strcat(obj->name, ".");
+		strcat(obj->name, global->params.name);
+	}
+
+	obj->type = &wpas_daemon_object_type;
+	obj->methods = wpas_daemon_object_type.methods;
+	obj->n_methods = wpas_daemon_object_type.n_methods;
+	ret = ubus_add_object(ctx, obj);
+	wpas_ubus_ref_inc();
+}
+
+void wpas_ubus_free(struct wpa_global *global)
+{
+	struct ubus_object *obj = &global->ubus_global;
+	char *name = (char *) obj->name;
+
+	if (!ctx)
+		return;
+
+	if (obj->id) {
+		ubus_remove_object(ctx, obj);
+		wpas_ubus_ref_dec();
+	}
+
+	free(name);
+}
+
+
 #ifdef CONFIG_WPS
 void wpas_ubus_notify(struct wpa_supplicant *wpa_s, const struct wps_credential *cred)
 {