policy: add steer-reject-timeout

Add a timeout in case a STA rejected a transition request. For this
configurable timeframe, usteer will refrain from steering the client
another time.

Signed-off-by: David Bauer <mail@david-bauer.net>

main.c

@@ -97,6 +97,8 @@ void usteer_init_defaults(void)
 	config.initial_connect_delay = 0;
 	config.remote_node_timeout = 10;
 
+	config.steer_reject_timeout = 60000;
+
 	config.roam_kick_delay = 10000;
 	config.roam_process_timeout = 5 * 1000;
 	config.roam_scan_tries = 3;

openwrt/usteer/files/etc/config/usteer

@@ -65,6 +65,9 @@ config usteer
 	# Timeout after which a station with snr < min_snr will be kicked
 	#option min_snr_kick_delay 5000
 
+	# Timeout (ms) for which a client will not be steered after rejecting a BSS-transition-request
+	#option steer_reject_timeout 60000
+
 	# Timeout (in ms) after which a association following a disassociation is not seen
 	# as a roam
 	#option roam_process_timeout 5000

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

@@ -81,7 +81,7 @@ uci_usteer() {
 		load_balancing_threshold band_steering_threshold \
 		remote_update_interval remote_node_timeout\
 		min_connect_snr min_snr min_snr_kick_delay signal_diff_threshold \
-		initial_connect_delay roam_process_timeout\
+		initial_connect_delay steer_reject_timeout roam_process_timeout\
 		roam_kick_delay roam_scan_tries roam_scan_timeout \
 		roam_scan_snr roam_scan_interval \
 		roam_trigger_snr roam_trigger_interval \

policy.c

@@ -385,6 +385,7 @@ usteer_local_node_roam_check(struct usteer_local_node *ln, struct uevent *ev)
 	list_for_each_entry(si, &ln->node.sta_info, node_list) {
 		if (si->connected != STA_CONNECTED || si->signal >= min_signal ||
 			si->kick_time ||
+			(si->bss_transition_response.status_code && current_time - si->bss_transition_response.timestamp < config.steer_reject_timeout) ||
 		    current_time - si->roam_kick < config.roam_trigger_interval) {
 			usteer_roam_set_state(si, ROAM_TRIGGER_IDLE, ev);
 			continue;

ubus.c

@@ -165,6 +165,7 @@ struct cfg_item {
 	_cfg(I32, min_connect_snr), \
 	_cfg(I32, min_snr), \
 	_cfg(U32, min_snr_kick_delay), \
+	_cfg(U32, steer_reject_timeout), \
 	_cfg(U32, roam_process_timeout), \
 	_cfg(I32, roam_scan_snr), \
 	_cfg(U32, roam_scan_tries), \

usteer.h

@@ -174,6 +174,8 @@ struct usteer_config {
 	int32_t min_connect_snr;
 	uint32_t signal_diff_threshold;
 
+	uint32_t steer_reject_timeout;
+
 	int32_t roam_scan_snr;
 	uint32_t roam_process_timeout;