add local_mode config option

This prevents communication with other usteer nodes and allows it to be
used for purely local band steering / load balancing

Signed-off-by: Felix Fietkau <nbd@nbd.name>

openwrt/usteer/files/etc/config/usteer

@@ -5,6 +5,9 @@ config usteer
 	# Log messages to syslog (0/1)
 	option 'syslog' '1'
 
+	# Disable network communication (0/1)
+	option local_mode '0'
+
 	# Use IPv6 for remote exchange
 	option 'ipv6' '0'
 

openwrt/usteer/files/etc/init.d/usteer

@@ -66,6 +66,7 @@ uci_usteer() {
 
 	uci_option_to_json_bool "$cfg" syslog
 	uci_option_to_json_bool "$cfg" ipv6
+	uci_option_to_json_bool "$cfg" local_mode
 	uci_option_to_json_bool "$cfg" load_kick_enabled
 	uci_option_to_json_bool "$cfg" assoc_steering
 	uci_option_to_json_string "$cfg" node_up_script

remote.c

@@ -315,6 +315,9 @@ interface_recv_msg(struct interface *iface, char *addr_str, void *buf, int len)
 	struct blob_attr *cur;
 	int rem;
 
+	if (config.local_mode)
+		return;
+
 	if (blob_pad_len(data) != len) {
 		MSG(DEBUG, "Invalid message length (header: %d, real: %d)\n", blob_pad_len(data), len);
 		return;
@@ -606,7 +609,7 @@ usteer_check_timeout(void)
 	int timeout = config.remote_node_timeout;
 
 	list_for_each_entry_safe(node, tmp, &remote_nodes, list) {
-		if (node->check++ > timeout)
+		if (config.local_mode || node->check++ > timeout)
 			remote_node_free(node);
 	}
 }
@@ -653,7 +656,8 @@ usteer_send_update_timer(struct uloop_timeout *t)
 	usteer_update_time();
 	uloop_timeout_set(t, config.remote_update_interval);
 
-	if (!avl_is_empty(&local_nodes) || host_info_blob) {
+	if (!config.local_mode &&
+	    (!avl_is_empty(&local_nodes) || host_info_blob)) {
 		c = usteer_update_init();
 		for_each_local_node(node)
 			usteer_send_node(node, NULL);

ubus.c

@@ -149,6 +149,7 @@ struct cfg_item {
 	_cfg(BOOL, syslog), \
 	_cfg(U32, debug_level), \
 	_cfg(BOOL, ipv6), \
+	_cfg(BOOL, local_mode), \
 	_cfg(U32, sta_block_timeout), \
 	_cfg(U32, local_sta_timeout), \
 	_cfg(U32, local_sta_update), \

usteer.h

@@ -149,6 +149,7 @@ struct usteer_config {
 	uint32_t debug_level;
 
 	bool ipv6;
+	bool local_mode;
 
 	uint32_t sta_block_timeout;
 	uint32_t local_sta_timeout;