cfg80211: Add an attribute to set inactivity timeout in AP mode

This patch adds an attribute, NL80211_ATTR_INACTIVITY_TIMEOUT,
to set the inactivity timeout which can be used to remove the
station in AP mode. This can be passed in NL80211_CMD_START_AP
and used by the drivers which have AP MLME in firmware but
don't support get_station() properly. To disable inactivity
timer in userspace, wpa_s for example, there is a new flag,
NL80211_FEATURE_INACTIVITY_TIMER, in nl80211_feature_flags
through which drivers can register their capability to use
the inactivity timeout to free the stations.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 38fda5e..9f46c62 100644 (file)
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -168,8 +168,8 @@
  *     %NL80211_ATTR_DTIM_PERIOD, %NL80211_ATTR_SSID,
  *     %NL80211_ATTR_HIDDEN_SSID, %NL80211_ATTR_CIPHERS_PAIRWISE,
  *     %NL80211_ATTR_CIPHER_GROUP, %NL80211_ATTR_WPA_VERSIONS,
- *     %NL80211_ATTR_AKM_SUITES, %NL80211_ATTR_PRIVACY and
- *     %NL80211_ATTR_AUTH_TYPE.
+ *     %NL80211_ATTR_AKM_SUITES, %NL80211_ATTR_PRIVACY,
+ *     %NL80211_ATTR_AUTH_TYPE and %NL80211_ATTR_INACTIVITY_TIMEOUT.
  * @NL80211_CMD_NEW_BEACON: old alias for %NL80211_CMD_START_AP
  * @NL80211_CMD_STOP_AP: Stop AP operation on the given interface
  * @NL80211_CMD_DEL_BEACON: old alias for %NL80211_CMD_STOP_AP
@@ -1197,6 +1197,12 @@ enum nl80211_commands {
  * @NL80211_ATTR_NOACK_MAP: This u16 bitmap contains the No Ack Policy of
  *      up to 16 TIDs.
  *
+ * @NL80211_ATTR_INACTIVITY_TIMEOUT: timeout value in seconds, this can be
+ *     used by the drivers which has MLME in firmware and does not have support
+ *     to report per station tx/rx activity to free up the staion entry from
+ *     the list. This needs to be used when the driver advertises the
+ *     capability to timeout the stations.
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -1442,6 +1448,8 @@ enum nl80211_attrs {
 
        NL80211_ATTR_NOACK_MAP,
 
+       NL80211_ATTR_INACTIVITY_TIMEOUT,
+
        /* add attributes here, update the policy in nl80211.c */
 
        __NL80211_ATTR_AFTER_LAST,
@@ -2809,10 +2817,13 @@ enum nl80211_ap_sme_features {
  *     TX status to the socket error queue when requested with the
  *     socket option.
  * @NL80211_FEATURE_HT_IBSS: This driver supports IBSS with HT datarates.
+ * @NL80211_FEATURE_INACTIVITY_TIMER: This driver takes care of freeing up
+ *     the connected inactive stations in AP mode.
  */
 enum nl80211_feature_flags {
        NL80211_FEATURE_SK_TX_STATUS    = 1 << 0,
        NL80211_FEATURE_HT_IBSS         = 1 << 1,
+       NL80211_FEATURE_INACTIVITY_TIMER = 1 << 2,
 };
 
 /**

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index d640a39..8048058 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -413,6 +413,7 @@ struct cfg80211_beacon_data {
  * @crypto: crypto settings
  * @privacy: the BSS uses privacy
  * @auth_type: Authentication type (algorithm)
+ * @inactivity_timeout: time in seconds to determine station's inactivity.
  */
 struct cfg80211_ap_settings {
        struct cfg80211_beacon_data beacon;
@@ -424,6 +425,7 @@ struct cfg80211_ap_settings {
        struct cfg80211_crypto_settings crypto;
        bool privacy;
        enum nl80211_auth_type auth_type;
+       int inactivity_timeout;
 };
 
 /**

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 25a470a..4b6afc3 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -204,6 +204,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
                .len = NL80211_HT_CAPABILITY_LEN
        },
        [NL80211_ATTR_NOACK_MAP] = { .type = NLA_U16 },
+       [NL80211_ATTR_INACTIVITY_TIMEOUT] = { .type = NLA_U16 },
 };
 
 /* policy for the key attributes */
@@ -2214,6 +2215,13 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
        if (err)
                return err;
 
+       if (info->attrs[NL80211_ATTR_INACTIVITY_TIMEOUT]) {
+               if (!(rdev->wiphy.features & NL80211_FEATURE_INACTIVITY_TIMER))
+                       return -EOPNOTSUPP;
+               params.inactivity_timeout = nla_get_u16(
+                       info->attrs[NL80211_ATTR_INACTIVITY_TIMEOUT]);
+       }
+
        err = rdev->ops->start_ap(&rdev->wiphy, dev, &params);
        if (!err)
                wdev->beacon_interval = params.beacon_interval;