[RFC PATCH 5/5] hostapd: DFS for channel switch in repeater mode

In repeater mode remote AP may request channel switch to a new channel.
Check if DFS is required for the new channel before proceeding with
normal AP operations. Start CAC procedure if radar detection is
required and channel is not yet marked as available.

Signed-off-by: Sergey Matyukevich <[email protected]>
---
 src/ap/drv_callbacks.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/ap/drv_callbacks.c b/src/ap/drv_callbacks.c
index fdd845573..6575eaa9f 100644
--- a/src/ap/drv_callbacks.c
+++ b/src/ap/drv_callbacks.c
@@ -906,6 +906,13 @@ void hostapd_event_ch_switch(struct hostapd_data *hapd, int freq, int ht,
 	} else if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) {
 		wpa_msg(hapd->msg_ctx, MSG_INFO, AP_CSA_FINISHED
 			"freq=%d dfs=%d", freq, is_dfs);
+	} else if (is_dfs) {
+		if (hostapd_is_dfs_required(hapd->iface) &&
+		    !hostapd_is_dfs_chan_available(hapd->iface) &&
+		    !hapd->iface->cac_started) {
+			hostapd_disable_iface(hapd->iface);
+			hostapd_enable_iface(hapd->iface);
+		}
 	}
 
 	for (i = 0; i < hapd->iface->num_bss; i++)
-- 
2.11.0