mac80211: support GTK rekey offload

This adds the necessary mac80211 APIs to support
GTK rekey offload, mirroring the functionality
from cfg80211.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 87 insertions, 0 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 9fe22cc393c..295ab747663 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2101,6 +2101,21 @@ static void ieee80211_get_ringparam(struct wiphy *wiphy,
 	drv_get_ringparam(local, tx, tx_max, rx, rx_max);
 }
 
+static int ieee80211_set_rekey_data(struct wiphy *wiphy,
+				    struct net_device *dev,
+				    struct cfg80211_gtk_rekey_data *data)
+{
+	struct ieee80211_local *local = wiphy_priv(wiphy);
+	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+	if (!local->ops->set_rekey_data)
+		return -EOPNOTSUPP;
+
+	drv_set_rekey_data(local, sdata, data);
+
+	return 0;
+}
+
 struct cfg80211_ops mac80211_config_ops = {
 	.add_virtual_intf = ieee80211_add_iface,
 	.del_virtual_intf = ieee80211_del_iface,
@@ -2163,4 +2178,5 @@ struct cfg80211_ops mac80211_config_ops = {
 	.get_antenna = ieee80211_get_antenna,
 	.set_ringparam = ieee80211_set_ringparam,
 	.get_ringparam = ieee80211_get_ringparam,
+	.set_rekey_data = ieee80211_set_rekey_data,
 };
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index 0e7e4268ddf..edd2dd79c9b 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -647,4 +647,14 @@ static inline int drv_set_bitrate_mask(struct ieee80211_local *local,
 	return ret;
 }
 
+static inline void drv_set_rekey_data(struct ieee80211_local *local,
+				      struct ieee80211_sub_if_data *sdata,
+				      struct cfg80211_gtk_rekey_data *data)
+{
+	trace_drv_set_rekey_data(local, sdata, data);
+	if (local->ops->set_rekey_data)
+		local->ops->set_rekey_data(&local->hw, &sdata->vif, data);
+	trace_drv_return_void(local);
+}
+
 #endif /* __MAC80211_DRIVER_OPS */
diff --git a/net/mac80211/driver-trace.h b/net/mac80211/driver-trace.h
index 3cb6795e926..31a9dfa81f6 100644
--- a/net/mac80211/driver-trace.h
+++ b/net/mac80211/driver-trace.h
@@ -1024,6 +1024,34 @@ TRACE_EVENT(drv_set_bitrate_mask,
 	)
 );
 
+TRACE_EVENT(drv_set_rekey_data,
+	TP_PROTO(struct ieee80211_local *local,
+		 struct ieee80211_sub_if_data *sdata,
+		 struct cfg80211_gtk_rekey_data *data),
+
+	TP_ARGS(local, sdata, data),
+
+	TP_STRUCT__entry(
+		LOCAL_ENTRY
+		VIF_ENTRY
+		__array(u8, kek, NL80211_KEK_LEN)
+		__array(u8, kck, NL80211_KCK_LEN)
+		__array(u8, replay_ctr, NL80211_REPLAY_CTR_LEN)
+	),
+
+	TP_fast_assign(
+		LOCAL_ASSIGN;
+		VIF_ASSIGN;
+		memcpy(__entry->kek, data->kek, NL80211_KEK_LEN);
+		memcpy(__entry->kck, data->kck, NL80211_KCK_LEN);
+		memcpy(__entry->replay_ctr, data->replay_ctr,
+		       NL80211_REPLAY_CTR_LEN);
+	),
+
+	TP_printk(LOCAL_PR_FMT VIF_PR_FMT,
+		  LOCAL_PR_ARG, VIF_PR_ARG)
+);
+
 /*
  * Tracing for API calls that drivers call.
  */
@@ -1293,6 +1321,27 @@ DEFINE_EVENT(local_only_evt, api_remain_on_channel_expired,
 	TP_ARGS(local)
 );
 
+TRACE_EVENT(api_gtk_rekey_notify,
+	TP_PROTO(struct ieee80211_sub_if_data *sdata,
+		 const u8 *bssid, const u8 *replay_ctr),
+
+	TP_ARGS(sdata, bssid, replay_ctr),
+
+	TP_STRUCT__entry(
+		VIF_ENTRY
+		__array(u8, bssid, ETH_ALEN)
+		__array(u8, replay_ctr, NL80211_REPLAY_CTR_LEN)
+	),
+
+	TP_fast_assign(
+		VIF_ASSIGN;
+		memcpy(__entry->bssid, bssid, ETH_ALEN);
+		memcpy(__entry->replay_ctr, replay_ctr, NL80211_REPLAY_CTR_LEN);
+	),
+
+	TP_printk(VIF_PR_FMT, VIF_PR_ARG)
+);
+
 /*
  * Tracing for internal functions
  * (which may also be called in response to driver calls)
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index fcab5fe726a..1208a7878bf 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -613,3 +613,15 @@ void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
 
 	mutex_unlock(&sdata->local->key_mtx);
 }
+
+
+void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
+				const u8 *replay_ctr, gfp_t gfp)
+{
+	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+
+	trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
+
+	cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
+}
+EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);