cfg80211: allow the user space to change current NAN configuration

Some NAN configuration paramaters may change during the operation of
the NAN device. For example, a user may want to update master preference
value when the device gets plugged/unplugged to the power.
Add API that allows to do so.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 2f35ccf..8574a57 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2327,6 +2327,18 @@ struct cfg80211_nan_conf {
 };
 
 /**
+ * enum cfg80211_nan_conf_changes - indicates changed fields in NAN
+ * configuration
+ *
+ * @CFG80211_NAN_CONF_CHANGED_PREF: master preference
+ * @CFG80211_NAN_CONF_CHANGED_DUAL: dual band operation
+ */
+enum cfg80211_nan_conf_changes {
+       CFG80211_NAN_CONF_CHANGED_PREF = BIT(0),
+       CFG80211_NAN_CONF_CHANGED_DUAL = BIT(1),
+};
+
+/**
  * struct cfg80211_nan_func_filter - a NAN function Rx / Tx filter
  *
  * @filter: the content of the filter
@@ -2691,6 +2703,9 @@ struct cfg80211_nan_func {
  *     On success the driver should assign an instance_id in the
  *     provided @nan_func.
  * @del_nan_func: Delete a NAN function.
+ * @nan_change_conf: changes NAN configuration. The changed parameters must
+ *     be specified in @changes (using &enum cfg80211_nan_conf_changes);
+ *     All other parameters must be ignored.
  */
 struct cfg80211_ops {
        int     (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -2963,6 +2978,10 @@ struct cfg80211_ops {
                                struct cfg80211_nan_func *nan_func);
        void    (*del_nan_func)(struct wiphy *wiphy, struct wireless_dev *wdev,
                               u64 cookie);
+       int     (*nan_change_conf)(struct wiphy *wiphy,
+                                  struct wireless_dev *wdev,
+                                  struct cfg80211_nan_conf *conf,
+                                  u32 changes);
 };
 
 /*

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index e4935d9..9c9c0c3 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -862,6 +862,10 @@
  *     the response to this command.
  *     Look at %NL80211_ATTR_SOCKET_OWNER as well.
  * @NL80211_CMD_DEL_NAN_FUNCTION: Delete a NAN function by cookie.
+ * @NL80211_CMD_CHANGE_NAN_CONFIG: Change current NAN configuration. NAN
+ *     must be operational (%NL80211_CMD_START_NAN was executed).
+ *     It must contain at least one of the following attributes:
+ *     %NL80211_ATTR_NAN_MASTER_PREF, %NL80211_ATTR_NAN_DUAL.
  *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
@@ -1055,6 +1059,7 @@ enum nl80211_commands {
        NL80211_CMD_STOP_NAN,
        NL80211_CMD_ADD_NAN_FUNCTION,
        NL80211_CMD_DEL_NAN_FUNCTION,
+       NL80211_CMD_CHANGE_NAN_CONFIG,
 
        /* add new commands above here */
 
@@ -1910,12 +1915,14 @@ enum nl80211_commands {
  *     used to pull the stored data for mesh peer in power save state.
  *
  * @NL80211_ATTR_NAN_MASTER_PREF: the master preference to be used by
- *     %NL80211_CMD_START_NAN. Its type is u8 and it can't be 0.
+ *     %NL80211_CMD_START_NAN and optionally with
+ *     %NL80211_CMD_CHANGE_NAN_CONFIG. Its type is u8 and it can't be 0.
  *     Also, values 1 and 255 are reserved for certification purposes and
  *     should not be used during a normal device operation.
  * @NL80211_ATTR_NAN_DUAL: NAN dual band operation config (see
  *     &enum nl80211_nan_dual_band_conf). This attribute is used with
- *     %NL80211_CMD_START_NAN.
+ *     %NL80211_CMD_START_NAN and optionally with
+ *     %NL80211_CMD_CHANGE_NAN_CONFIG.
  * @NL80211_ATTR_NAN_FUNC: a function that can be added to NAN. See
  *     &enum nl80211_nan_func_attributes for description of this nested
  *     attribute.

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 0eca59c..c0b5ae4 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -10919,6 +10919,40 @@ static int nl80211_nan_del_func(struct sk_buff *skb,
        return 0;
 }
 
+static int nl80211_nan_change_config(struct sk_buff *skb,
+                                    struct genl_info *info)
+{
+       struct cfg80211_registered_device *rdev = info->user_ptr[0];
+       struct wireless_dev *wdev = info->user_ptr[1];
+       struct cfg80211_nan_conf conf = {};
+       u32 changed = 0;
+
+       if (wdev->iftype != NL80211_IFTYPE_NAN)
+               return -EOPNOTSUPP;
+
+       if (!wdev->nan_started)
+               return -ENOTCONN;
+
+       if (info->attrs[NL80211_ATTR_NAN_MASTER_PREF]) {
+               conf.master_pref =
+                       nla_get_u8(info->attrs[NL80211_ATTR_NAN_MASTER_PREF]);
+               if (conf.master_pref <= 1 || conf.master_pref == 255)
+                       return -EINVAL;
+
+               changed |= CFG80211_NAN_CONF_CHANGED_PREF;
+       }
+
+       if (info->attrs[NL80211_ATTR_NAN_DUAL]) {
+               conf.dual = nla_get_u8(info->attrs[NL80211_ATTR_NAN_DUAL]);
+               changed |= CFG80211_NAN_CONF_CHANGED_DUAL;
+       }
+
+       if (!changed)
+               return -EINVAL;
+
+       return rdev_nan_change_conf(rdev, wdev, &conf, changed);
+}
+
 static int nl80211_get_protocol_features(struct sk_buff *skb,
                                         struct genl_info *info)
 {
@@ -12293,6 +12327,14 @@ static const struct genl_ops nl80211_ops[] = {
                                  NL80211_FLAG_NEED_RTNL,
        },
        {
+               .cmd = NL80211_CMD_CHANGE_NAN_CONFIG,
+               .doit = nl80211_nan_change_config,
+               .policy = nl80211_policy,
+               .flags = GENL_ADMIN_PERM,
+               .internal_flags = NL80211_FLAG_NEED_WDEV_UP |
+                                 NL80211_FLAG_NEED_RTNL,
+       },
+       {
                .cmd = NL80211_CMD_SET_MCAST_RATE,
                .doit = nl80211_set_mcast_rate,
                .policy = nl80211_policy,

diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h
index 98c4c3b..11cf83c 100644 (file)
--- a/net/wireless/rdev-ops.h
+++ b/net/wireless/rdev-ops.h
@@ -928,6 +928,23 @@ static inline void rdev_del_nan_func(struct cfg80211_registered_device *rdev,
        trace_rdev_return_void(&rdev->wiphy);
 }
 
+static inline int
+rdev_nan_change_conf(struct cfg80211_registered_device *rdev,
+                    struct wireless_dev *wdev,
+                    struct cfg80211_nan_conf *conf, u32 changes)
+{
+       int ret;
+
+       trace_rdev_nan_change_conf(&rdev->wiphy, wdev, conf, changes);
+       if (rdev->ops->nan_change_conf)
+               ret = rdev->ops->nan_change_conf(&rdev->wiphy, wdev, conf,
+                                                changes);
+       else
+               ret = -ENOTSUPP;
+       trace_rdev_return_int(&rdev->wiphy, ret);
+       return ret;
+}
+
 static inline int rdev_set_mac_acl(struct cfg80211_registered_device *rdev,
                                   struct net_device *dev,
                                   struct cfg80211_acl_data *params)

diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 5608984..a3d0a91 100644 (file)
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -1911,6 +1911,30 @@ TRACE_EVENT(rdev_start_nan,
                  __entry->dual)
 );
 
+TRACE_EVENT(rdev_nan_change_conf,
+       TP_PROTO(struct wiphy *wiphy, struct wireless_dev *wdev,
+                struct cfg80211_nan_conf *conf, u32 changes),
+       TP_ARGS(wiphy, wdev, conf, changes),
+       TP_STRUCT__entry(
+               WIPHY_ENTRY
+               WDEV_ENTRY
+               __field(u8, master_pref)
+               __field(u8, dual);
+               __field(u32, changes);
+       ),
+       TP_fast_assign(
+               WIPHY_ASSIGN;
+               WDEV_ASSIGN;
+               __entry->master_pref = conf->master_pref;
+               __entry->dual = conf->dual;
+               __entry->changes = changes;
+       ),
+       TP_printk(WIPHY_PR_FMT ", " WDEV_PR_FMT
+                 ", master preference: %u, dual: %d, changes: %x",
+                 WIPHY_PR_ARG, WDEV_PR_ARG, __entry->master_pref,
+                 __entry->dual, __entry->changes)
+);
+
 DEFINE_EVENT(wiphy_wdev_evt, rdev_stop_nan,
        TP_PROTO(struct wiphy *wiphy, struct wireless_dev *wdev),
        TP_ARGS(wiphy, wdev)