policy: make roam-steers client-rejectable

While usteer tries it's best to determine the availability of a better
node for a certain client, it might still attempt to direct the client
to a unsuitable AP.

Transition away from using BSS-Transition-Requests with the
disassoc-imminent bit set and instead unset this bit.

This way, the client can inform the AP it will not transition to a
different BSS but instead wishes to remain connected to the current AP.

usteer will still kick clients in case they either accepted the
BSS-transition-request and do not roam or ignore the request completely.

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

local_node.c

@@ -180,6 +180,11 @@ usteer_handle_bss_tm_response(struct usteer_local_node *ln, struct blob_attr *ms
 	si->bss_transition_response.status_code = blobmsg_get_u8(tb[BSS_TM_RESPONSE_STATUS_CODE]);
 	si->bss_transition_response.timestamp = current_time;
 
+	if (si->bss_transition_response.status_code) {
+		/* Cancel imminent kick in case BSS transition was rejected */
+		si->kick_time = 0;
+	}
+
 	return 0;
 }