mac80211: remove drop_unencrypted code

This mechanism was historic, and only ever used by IBSS, which
also doesn't need to have it as it properly manages station's
802.1X PAE state (or, with WEP, always has a key.)

Remove the mechanism to clean up the code.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

7 files changed, 2 insertions, 30 deletions

diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 74830ce..23813eb 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -274,8 +274,6 @@ void debugfs_hw_add(struct ieee80211_local *local)
 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 	DEBUGFS_STATS_ADD(tx_handlers_drop, local->tx_handlers_drop);
 	DEBUGFS_STATS_ADD(tx_handlers_queued, local->tx_handlers_queued);
-	DEBUGFS_STATS_ADD(tx_handlers_drop_unencrypted,
-		local->tx_handlers_drop_unencrypted);
 	DEBUGFS_STATS_ADD(tx_handlers_drop_fragment,
 		local->tx_handlers_drop_fragment);
 	DEBUGFS_STATS_ADD(tx_handlers_drop_wep,
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index c68896a..29236e8 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -177,7 +177,6 @@ static ssize_t ieee80211_if_write_##name(struct file *file,		\
 	IEEE80211_IF_FILE_R(name)
 
 /* common attributes */
-IEEE80211_IF_FILE(drop_unencrypted, drop_unencrypted, DEC);
 IEEE80211_IF_FILE(rc_rateidx_mask_2ghz, rc_rateidx_mask[IEEE80211_BAND_2GHZ],
 		  HEX);
 IEEE80211_IF_FILE(rc_rateidx_mask_5ghz, rc_rateidx_mask[IEEE80211_BAND_5GHZ],
@@ -562,7 +561,6 @@ IEEE80211_IF_FILE(dot11MeshAwakeWindowDuration,
 
 static void add_common_files(struct ieee80211_sub_if_data *sdata)
 {
-	DEBUGFS_ADD(drop_unencrypted);
 	DEBUGFS_ADD(rc_rateidx_mask_2ghz);
 	DEBUGFS_ADD(rc_rateidx_mask_5ghz);
 	DEBUGFS_ADD(rc_rateidx_mcs_mask_2ghz);
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index dec24d4..17eda35 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -249,8 +249,6 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 	if (presp)
 		kfree_rcu(presp, rcu_head);
 
-	sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
-
 	/* make a copy of the chandef, it could be modified below. */
 	chandef = *req_chandef;
 	chan = chandef.chan;
@@ -1303,8 +1301,6 @@ static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 
 	if (ifibss->privacy)
 		capability |= WLAN_CAPABILITY_PRIVACY;
-	else
-		sdata->drop_unencrypted = 0;
 
 	__ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 				  &ifibss->chandef, ifibss->basic_rates,
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 0266c57..4f4bcc6 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -818,8 +818,6 @@ struct ieee80211_sub_if_data {
 
 	unsigned long state;
 
-	int drop_unencrypted;
-
 	char name[IFNAMSIZ];
 
 	/* Fragment table for host-based reassembly */
@@ -1262,7 +1260,6 @@ struct ieee80211_local {
 	/* TX/RX handler statistics */
 	unsigned int tx_handlers_drop;
 	unsigned int tx_handlers_queued;
-	unsigned int tx_handlers_drop_unencrypted;
 	unsigned int tx_handlers_drop_fragment;
 	unsigned int tx_handlers_drop_wep;
 	unsigned int tx_handlers_drop_not_assoc;
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 81a2751..9689d3b 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1508,7 +1508,6 @@ int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 	}
 
 	/* reset some values that shouldn't be kept across type changes */
-	sdata->drop_unencrypted = 0;
 	if (type == NL80211_IFTYPE_STATION)
 		sdata->u.mgd.use_4addr = false;
 
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 6accd61..9eab443 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1912,8 +1912,7 @@ static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
 	/* Drop unencrypted frames if key is set. */
 	if (unlikely(!ieee80211_has_protected(fc) &&
 		     !ieee80211_is_nullfunc(fc) &&
-		     ieee80211_is_data(fc) &&
-		     (rx->key || rx->sdata->drop_unencrypted)))
+		     ieee80211_is_data(fc) && rx->key))
 		return -EACCES;
 
 	return 0;
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 7e7de81..0bae03b 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -593,23 +593,8 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
 	else if (!is_multicast_ether_addr(hdr->addr1) &&
 		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
 		tx->key = key;
-	else if (info->flags & IEEE80211_TX_CTL_INJECTED)
-		tx->key = NULL;
-	else if (!tx->sdata->drop_unencrypted)
-		tx->key = NULL;
-	else if (tx->skb->protocol == tx->sdata->control_port_protocol)
-		tx->key = NULL;
-	else if (ieee80211_is_robust_mgmt_frame(tx->skb) &&
-		 !(ieee80211_is_action(hdr->frame_control) &&
-		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
-		tx->key = NULL;
-	else if (ieee80211_is_mgmt(hdr->frame_control) &&
-		 !ieee80211_is_robust_mgmt_frame(tx->skb))
+	else
 		tx->key = NULL;
-	else {
-		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
-		return TX_DROP;
-	}
 
 	if (tx->key) {
 		bool skip_hw = false;