nl80211: Implement shared_freq

This patch implements shared_freq handler for driver_nl80211.c. If a
"p2p_group_add" happens after legacy STA association, then this patch
will help to start the GO on the same frequency. This is useful when
supplicant is started on multiple interface running over a singly "PHY"
and the station interface is not used for the P2P device operations.

For example, wpa_supplicant -iwlan0 ..  -N -iwlan1 ... and wlan0 is used
for station connection and wlan1 as the P2P device interface.

Signed-hostap: Jithu Jance <jithu@broadcom.com>

diff --git a/src/drivers/driver_nl80211.c b/src/drivers/driver_nl80211.c
index 89775d794756d2ad9a52f47d5012065fd4b88a5f..1b0656da09883212388adc9006fa1961583c05d6 100644 (file)
--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -7216,6 +7216,44 @@ static int nl80211_signal_poll(void *priv, struct wpa_signal_info *si)
 }
 
 
+static int wpa_driver_nl80211_shared_freq(void *priv)
+{
+       struct i802_bss *bss = priv;
+       struct wpa_driver_nl80211_data *drv = bss->drv;
+       struct wpa_driver_nl80211_data *driver;
+       int freq = 0;
+
+       /*
+        * If the same PHY is in connected state with some other interface,
+        * then retrieve the assoc freq.
+        */
+       wpa_printf(MSG_DEBUG, "nl80211: Get shared freq for PHY %s",
+                  drv->phyname);
+
+       dl_list_for_each(driver, &drv->global->interfaces,
+                        struct wpa_driver_nl80211_data, list) {
+               if (drv == driver ||
+                   os_strcmp(drv->phyname, driver->phyname) != 0 ||
+                   !driver->associated)
+                       continue;
+
+               wpa_printf(MSG_DEBUG, "nl80211: Found a match for PHY %s - %s "
+                          MACSTR,
+                          driver->phyname, driver->first_bss.ifname,
+                          MAC2STR(driver->addr));
+               freq = nl80211_get_assoc_freq(driver);
+               wpa_printf(MSG_DEBUG, "nl80211: Shared freq for PHY %s: %d",
+                          drv->phyname, freq);
+       }
+
+       if (!freq)
+               wpa_printf(MSG_DEBUG, "nl80211: No shared interface for "
+                          "PHY (%s) in associated state", drv->phyname);
+
+       return freq;
+}
+
+
 static int nl80211_send_frame(void *priv, const u8 *data, size_t data_len,
                              int encrypt)
 {
@@ -7594,6 +7632,7 @@ const struct wpa_driver_ops wpa_driver_nl80211_ops = {
        .signal_monitor = nl80211_signal_monitor,
        .signal_poll = nl80211_signal_poll,
        .send_frame = nl80211_send_frame,
+       .shared_freq = wpa_driver_nl80211_shared_freq,
        .set_param = nl80211_set_param,
        .get_radio_name = nl80211_get_radio_name,
        .add_pmkid = nl80211_add_pmkid,