Add nl80211 driver operation functions:
hostapd_enable_tx – to enable tx on DFS channel after
channel availability check.
hostapd_channel_switch – to handle channel switch request.
hostapd_start_radar_detection – to enable radar detection
on DFS channel.
Signed-hostap: Victor Goldenshtein <victorg@xxxxxx>
---
src/ap/ap_config.h | 3 ++
src/ap/ap_drv_ops.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++
src/ap/ap_drv_ops.h | 5 +++
src/ap/hostapd.h | 6 +++
src/drivers/driver.h | 48 +++++++++++++++++++++++++
5 files changed, 157 insertions(+), 0 deletions(-)
diff --git a/src/ap/ap_config.h b/src/ap/ap_config.h
index bfb2d8a..c21a7a8 100644
--- a/src/ap/ap_config.h
+++ b/src/ap/ap_config.h
@@ -454,6 +454,9 @@ struct hostapd_config {
int ieee80211d;
+ /* DFS */
+ 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 64c9c20..d1d9e8b 100644
--- a/src/ap/ap_drv_ops.c
+++ b/src/ap/ap_drv_ops.c
@@ -621,3 +621,98 @@ int hostapd_drv_send_action(struct hostapd_data *hapd, unsigned int freq,
hapd->own_addr, hapd->own_addr, data,
len, 0);
}
+
+int hostapd_enable_tx(struct hostapd_data *hapd, int freq, int flags)
+{
+ struct os_time now;
+
+ if (!hapd->driver || !hapd->driver->enable_tx)
+ return 0;
+
+ if ((flags & HOSTAPD_CHAN_RADAR) &&
+ !(hapd->iface->dfs_state & DFS_ENABLED)) {
+ wpa_printf(MSG_ERROR, "Can't enable tx, "
+ "DFS functionality is not enabled");
+ return -1;
+ }
+
+ os_get_time(&now);
+
+ if ((flags & HOSTAPD_CHAN_RADAR) &&
+ now.sec - hapd->iface->dfs_start_cac_ts < DFS_MIN_CAC_TIME_SEC) {
+ wpa_printf(MSG_ERROR, "Can't enable tx, "
+ "DFS min CAC time hasn't passed");
+ return -1;
+ }
+
+ hapd->iface->dfs_start_cac_ts = 0;
+
+ return hapd->driver->enable_tx(hapd->drv_priv, freq);
+}
+
+
+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) &&
+ !(hapd->iface->dfs_state & DFS_ENABLED)) {
+ wpa_printf(MSG_ERROR, "Can't switch to radar channel, "
+ "DFS functionality is not enabled");
+ 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->iface->conf->channel_switch_count;
+
+ return hapd->driver->hapd_channel_switch(hapd->drv_priv, ¶ms);
+}
+
+int hostapd_start_radar_detection(struct hostapd_data *hapd, int freq,
+ int flags)
+{
+ int ret;
+ struct os_time now;
+
+ if (!hapd->driver || !hapd->driver->start_radar_detection)
+ return 0;
+
+ if (!(flags & HOSTAPD_CHAN_RADAR)) {
+ wpa_printf(MSG_ERROR, "Can't start radar detection, the channel"
+ " %d is not DFS channel", (int)hapd->iconf->channel);
+ return -1;
+ }
+
+ if (!(hapd->iface->dfs_state & DFS_ENABLED)) {
+ wpa_printf(MSG_ERROR, "Can't start radar detection, "
+ "DFS functionality is not enabled");
+ return -1;
+ }
+
+ if (hapd->iface->conf->secondary_channel) {
+ wpa_printf(MSG_ERROR, "Can't start radar detection, "
+ "DFS functionality on HT40 is not supported");
+ return -1;
+ }
+
+ ret = hapd->driver->start_radar_detection(hapd->drv_priv, freq);
+ if (!ret) {
+ os_get_time(&now);
+ hapd->iface->dfs_start_cac_ts = now.sec;
+ } else
+ hapd->iface->dfs_start_cac_ts = 0;
+
+ return ret;
+}
diff --git a/src/ap/ap_drv_ops.h b/src/ap/ap_drv_ops.h
index 9c53b99..f36bec1 100644
--- a/src/ap/ap_drv_ops.h
+++ b/src/ap/ap_drv_ops.h
@@ -97,6 +97,11 @@ 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_enable_tx(struct hostapd_data *hapd, int freq, int flags);
+int hostapd_channel_switch(struct hostapd_data *hapd, int freq, int flags,
+ u8 tx_block, u8 post_switch_block_tx);
+int hostapd_start_radar_detection(struct hostapd_data *hapd, int freq,
+ int flags);
#include "drivers/driver.h"
diff --git a/src/ap/hostapd.h b/src/ap/hostapd.h
index f7ed311..cdd7556 100644
--- a/src/ap/hostapd.h
+++ b/src/ap/hostapd.h
@@ -240,6 +240,12 @@ struct hostapd_iface {
int olbc_ht;
u16 ht_op_mode;
+
+ /* dfs states */
+ u8 dfs_state;
+ /* dfs start channel availability check time stamp */
+ os_time_t dfs_start_cac_ts;
+
void (*scan_cb)(struct hostapd_iface *iface);
int (*ctrl_iface_init)(struct hostapd_data *hapd);
diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index 82b72cd..bc714e8 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -29,6 +29,19 @@
#define HOSTAPD_CHAN_HT40MINUS 0x00000020
#define HOSTAPD_CHAN_HT40 0x00000040
+/*
+ * DFS functionality is enabled.
+ */
+#define DFS_ENABLED BIT(0)
+
+/*
+ * DFS Channel Availability Check Time - the time a system shall monitor a
+ * 'radar channel' for presence of radar prior to initiating a TX, spec defines
+ * it as 60 seconds.
+ * Driver will block any attempt to enable the TX prior this minimal CAC time.
+ */
+#define DFS_MIN_CAC_TIME_SEC 60
+
/**
* struct hostapd_channel_data - Channel information
*/
@@ -904,6 +917,16 @@ 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
@@ -2603,6 +2626,31 @@ struct wpa_driver_ops {
* avoid frequency conflict in single channel concurrency.
*/
int (*switch_channel)(void *priv, unsigned int freq);
+
+ /**
+ * 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);
+
+ /**
+ * enable_tx - Enable TX
+ * @priv: Private driver interface data
+ * @freq: Frequency (in MHz) of the channel
+ * Returns: 0 on success, -1 on failure
+ */
+ int (*enable_tx)(void *priv, int freq);
+
+ /**
+ * start_radar_detection - Listen for radar interference on the channel.
+ * @priv: Private driver interface data
+ * @freq: Frequency (in MHz) of the channel
+ * Returns: 0 on success, -1 on failure
+ */
+ int (*start_radar_detection)(void *priv, int freq);
};
--
1.7.5.4
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