hostapd: add back support for passing CSA events from sta/mesh to AP interfaces

Fixes handling CSA when using AP+STA or AP+Mesh
This change was accidentally dropped in commit 167028b75
("hostapd: Update to version 2.9 (2019-08-08)")

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

package/network/services/hostapd/patches/370-ap_sta_support.patch

@@ -272,3 +272,132 @@
  	hapd->beacon_set_done = 1;
  
  	if (ieee802_11_build_ap_params(hapd, &params) < 0)
+--- a/wpa_supplicant/events.c
++++ b/wpa_supplicant/events.c
+@@ -4184,6 +4184,60 @@ static void wpas_event_assoc_reject(stru
+ }
+ 
+ 
++static void
++supplicant_ch_switch_started(struct wpa_supplicant *wpa_s,
++			    union wpa_event_data *data)
++{
++	char buf[256];
++	size_t len = sizeof(buf);
++	char *cmd = NULL;
++	int width = 20;
++	int ret;
++
++	if (!wpa_s->hostapd)
++		return;
++
++	wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_CHANNEL_SWITCH
++		"count=%d freq=%d ht_enabled=%d ch_offset=%d ch_width=%s cf1=%d cf2=%d",
++		data->ch_switch.count,
++		data->ch_switch.freq,
++		data->ch_switch.ht_enabled,
++		data->ch_switch.ch_offset,
++		channel_width_to_string(data->ch_switch.ch_width),
++		data->ch_switch.cf1,
++		data->ch_switch.cf2);
++
++	switch (data->ch_switch.ch_width) {
++	case CHAN_WIDTH_20_NOHT:
++	case CHAN_WIDTH_20:
++		width = 20;
++		break;
++	case CHAN_WIDTH_40:
++		width = 40;
++		break;
++	case CHAN_WIDTH_80:
++		width = 80;
++		break;
++	case CHAN_WIDTH_160:
++	case CHAN_WIDTH_80P80:
++		width = 160;
++		break;
++	}
++
++	asprintf(&cmd, "CHAN_SWITCH %d %d sec_channel_offset=%d center_freq1=%d center_freq2=%d, bandwidth=%d auto-ht\n",
++		data->ch_switch.count - 1,
++		data->ch_switch.freq,
++		data->ch_switch.ch_offset,
++		data->ch_switch.cf1,
++		data->ch_switch.cf2,
++		width);
++	ret = wpa_ctrl_request(wpa_s->hostapd, cmd, os_strlen(cmd), buf, &len, NULL);
++	free(cmd);
++
++	if (ret < 0)
++		wpa_printf(MSG_ERROR, "\nFailed to reload hostapd AP interfaces\n");
++}
++
+ void supplicant_event(void *ctx, enum wpa_event_type event,
+ 		      union wpa_event_data *data)
+ {
+@@ -4485,8 +4539,10 @@ void supplicant_event(void *ctx, enum wp
+ 			channel_width_to_string(data->ch_switch.ch_width),
+ 			data->ch_switch.cf1,
+ 			data->ch_switch.cf2);
+-		if (event == EVENT_CH_SWITCH_STARTED)
++		if (event == EVENT_CH_SWITCH_STARTED) {
++			supplicant_ch_switch_started(wpa_s, data);
+ 			break;
++		}
+ 
+ 		wpa_s->assoc_freq = data->ch_switch.freq;
+ 		wpa_s->current_ssid->frequency = data->ch_switch.freq;
+--- a/src/drivers/driver.h
++++ b/src/drivers/driver.h
+@@ -5478,6 +5478,7 @@ union wpa_event_data {
+ 
+ 	/**
+ 	 * struct ch_switch
++	 * @count: Count until channel switch activates
+ 	 * @freq: Frequency of new channel in MHz
+ 	 * @ht_enabled: Whether this is an HT channel
+ 	 * @ch_offset: Secondary channel offset
+@@ -5486,6 +5487,7 @@ union wpa_event_data {
+ 	 * @cf2: Center frequency 2
+ 	 */
+ 	struct ch_switch {
++		int count;
+ 		int freq;
+ 		int ht_enabled;
+ 		int ch_offset;
+--- a/src/drivers/driver_nl80211_event.c
++++ b/src/drivers/driver_nl80211_event.c
+@@ -536,7 +536,7 @@ static void mlme_event_ch_switch(struct
+ 				 struct nlattr *ifindex, struct nlattr *freq,
+ 				 struct nlattr *type, struct nlattr *bw,
+ 				 struct nlattr *cf1, struct nlattr *cf2,
+-				 int finished)
++				 struct nlattr *count, int finished)
+ {
+ 	struct i802_bss *bss;
+ 	union wpa_event_data data;
+@@ -595,6 +595,8 @@ static void mlme_event_ch_switch(struct
+ 		data.ch_switch.cf1 = nla_get_u32(cf1);
+ 	if (cf2)
+ 		data.ch_switch.cf2 = nla_get_u32(cf2);
++	if (count)
++		data.ch_switch.count = nla_get_u32(count);
+ 
+ 	if (finished)
+ 		bss->freq = data.ch_switch.freq;
+@@ -2544,6 +2546,7 @@ static void do_process_drv_event(struct
+ 				     tb[NL80211_ATTR_CHANNEL_WIDTH],
+ 				     tb[NL80211_ATTR_CENTER_FREQ1],
+ 				     tb[NL80211_ATTR_CENTER_FREQ2],
++				     tb[NL80211_ATTR_CH_SWITCH_COUNT],
+ 				     0);
+ 		break;
+ 	case NL80211_CMD_CH_SWITCH_NOTIFY:
+@@ -2554,6 +2557,7 @@ static void do_process_drv_event(struct
+ 				     tb[NL80211_ATTR_CHANNEL_WIDTH],
+ 				     tb[NL80211_ATTR_CENTER_FREQ1],
+ 				     tb[NL80211_ATTR_CENTER_FREQ2],
++				     NULL,
+ 				     1);
+ 		break;
+ 	case NL80211_CMD_DISCONNECT: