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>

3 files changed, 83 insertions, 0 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 0eca59ccd685..c0b5ae4af2d8 100644
--- 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 98c4c3bdcb11..11cf83c8ad4f 100644
--- 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 56089843d619..a3d0a91b1e09 100644
--- 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)