hostapd: implement channel switch request drv ops (INTERNAL)

New hostapd_channel_switch – to handle channel switch request.

Signed-hostap: Victor Goldenshtein <victorg@ti.com>

4 files changed, 55 insertions, 0 deletions

diff --git a/src/ap/ap_config.h b/src/ap/ap_config.h
index 4e10a0f..d6b67fe 100644
--- a/src/ap/ap_config.h
+++ b/src/ap/ap_config.h
@@ -432,6 +432,9 @@ struct hostapd_config {
 
 	int ieee80211d;
 
+	/* AP/GO channel switch count */
+	int channel_switch_count;
+
 	struct hostapd_tx_queue_params tx_queue[NUM_TX_QUEUES];
 
 	/*
diff --git a/src/ap/ap_drv_ops.c b/src/ap/ap_drv_ops.c
index 859b529..fbeaf9c 100644
--- a/src/ap/ap_drv_ops.c
+++ b/src/ap/ap_drv_ops.c
@@ -596,3 +596,34 @@ int hostapd_drv_send_action(struct hostapd_data *hapd, unsigned int freq,
 					 hapd->own_addr, hapd->own_addr, data,
 					 len, 0);
 }
+
+
+int hostapd_channel_switch(struct hostapd_data *hapd, int freq, int flags,
+			   u8 tx_block, u8 post_switch_block_tx)
+{
+	struct hostapd_channel_switch params;
+
+	if (!hapd->driver || !hapd->driver->hapd_channel_switch)
+		return 0;
+
+	if (flags & HOSTAPD_CHAN_RADAR) {
+		wpa_printf(MSG_ERROR, "Can't switch to radar channel, "
+			   "DFS functionality is not supported");
+		return -1;
+	}
+
+	if (hapd->iface->conf->secondary_channel) {
+		wpa_printf(MSG_ERROR, "Channel switch is not supported "
+			   "with HT40");
+		return -1;
+	}
+
+	params.freq = freq;
+	params.tx_block = tx_block;
+	params.post_switch_block_tx = post_switch_block_tx;
+	params.ch_switch_count =
+	        (hapd->iconf->channel_switch_count > hapd->conf->dtim_period) ?
+	        hapd->iconf->channel_switch_count : hapd->conf->dtim_period * 2;
+
+	return hapd->driver->hapd_channel_switch(hapd->drv_priv, &params);
+}
diff --git a/src/ap/ap_drv_ops.h b/src/ap/ap_drv_ops.h
index e3b15c0..6305050 100644
--- a/src/ap/ap_drv_ops.h
+++ b/src/ap/ap_drv_ops.h
@@ -97,6 +97,8 @@ int hostapd_sta_assoc(struct hostapd_data *hapd, const u8 *addr,
 		      int reassoc, u16 status, const u8 *ie, size_t len);
 int hostapd_add_tspec(struct hostapd_data *hapd, const u8 *addr,
 		      u8 *tspec_ie, size_t tspec_ielen);
+int hostapd_channel_switch(struct hostapd_data *hapd, int freq, int flags,
+			   u8 tx_block, u8 post_switch_block_tx);
 
 
 #include "drivers/driver.h"
diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index 7afbda1..b25b4b9 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -898,6 +898,16 @@ struct hostapd_freq_params {
 				 * enabled, secondary channel above primary */
 };
 
+struct hostapd_channel_switch {
+	int freq;
+	int tx_block;			/* immediately block the tx on the
+					 * operational channel
+					 * (prior channel switch) */
+	int post_switch_block_tx;	/* block tx on the target ch (after
+					 * channel switch) */
+	int ch_switch_count;
+};
+
 enum wpa_driver_if_type {
 	/**
 	 * WPA_IF_STATION - Station mode interface
@@ -2587,6 +2597,15 @@ struct wpa_driver_ops {
 	 * Returns: 0 on success, -1 on failure
 	 */
 	 int (*driver_cmd)(void *priv, char *cmd, char *buf, size_t buf_len);
+
+	/**
+	 * hapd_channel_switch - Perform an AP channel switch
+	 * @priv: Private driver interface data
+	 * @params: Channels switch parameters
+	 * Returns: 0 on success, -1 on failure
+	 */
+	int (*hapd_channel_switch)(void *priv,
+				   struct hostapd_channel_switch *params);
 };