mac80211: backport support for the IEEE80211_KEY_FLAG_GENERATE_MMIE flag

Required for an upcoming mt76 update

Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry-picked from commit 0441edfb7f)

package/kernel/mac80211/patches/subsys/361-mac80211-add-IEEE80211_KEY_FLAG_GENERATE_MMIE-to-iee.patch

@@ -0,0 +1,58 @@
+From: Lorenzo Bianconi <lorenzo@kernel.org>
+Date: Tue, 16 Jul 2019 00:09:19 +0200
+Subject: [PATCH] mac80211: add IEEE80211_KEY_FLAG_GENERATE_MMIE to
+ ieee80211_key_flags
+
+Add IEEE80211_KEY_FLAG_GENERATE_MMIE flag to ieee80211_key_flags in order
+to allow the driver to notify mac80211 to generate MMIE and that it
+requires sequence number generation only.
+This is a preliminary patch to add BIP_CMAC_128 hw support to mt7615
+driver
+
+Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
+Link: https://lore.kernel.org/r/dfe275f9aa0f1cc6b33085f9efd5d8447f68ad13.1563228405.git.lorenzo@kernel.org
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+
+--- a/include/net/mac80211.h
++++ b/include/net/mac80211.h
+@@ -1616,6 +1616,9 @@ struct wireless_dev *ieee80211_vif_to_wd
+  * @IEEE80211_KEY_FLAG_PUT_MIC_SPACE: This flag should be set by the driver for
+  *	a TKIP key if it only requires MIC space. Do not set together with
+  *	@IEEE80211_KEY_FLAG_GENERATE_MMIC on the same key.
++ * @IEEE80211_KEY_FLAG_GENERATE_MMIE: This flag should be set by the driver
++ *	for a AES_CMAC key to indicate that it requires sequence number
++ *	generation only
+  */
+ enum ieee80211_key_flags {
+ 	IEEE80211_KEY_FLAG_GENERATE_IV_MGMT	= BIT(0),
+@@ -1627,6 +1630,7 @@ enum ieee80211_key_flags {
+ 	IEEE80211_KEY_FLAG_RX_MGMT		= BIT(6),
+ 	IEEE80211_KEY_FLAG_RESERVE_TAILROOM	= BIT(7),
+ 	IEEE80211_KEY_FLAG_PUT_MIC_SPACE	= BIT(8),
++	IEEE80211_KEY_FLAG_GENERATE_MMIE	= BIT(10),
+ };
+ 
+ /**
+--- a/net/mac80211/wpa.c
++++ b/net/mac80211/wpa.c
+@@ -947,7 +947,8 @@ ieee80211_crypto_aes_cmac_encrypt(struct
+ 
+ 	info = IEEE80211_SKB_CB(skb);
+ 
+-	if (info->control.hw_key)
++	if (info->control.hw_key &&
++	    !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE))
+ 		return TX_CONTINUE;
+ 
+ 	if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
+@@ -963,6 +964,9 @@ ieee80211_crypto_aes_cmac_encrypt(struct
+ 
+ 	bip_ipn_set64(mmie->sequence_number, pn64);
+ 
++	if (info->control.hw_key)
++		return TX_CONTINUE;
++
+ 	bip_aad(skb, aad);
+ 
+ 	/*