mac80211: move control.hw_key assignment

When mac80211 asks a driver to encrypt a frame, it
must assign the control.hw_key pointer for it to
know which key to use etc. Currently, mac80211 does
this whenever it would software-encrypt a frame.

Change the logic of this code to assign the hw_key
pointer when selecting the key, and later check it
when deciding whether to encrypt the frame or let
it be encrypted by the hardware. This allows us to
later simply skip the encryption function since it
no longer modifies the TX control.

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

1 files changed, 22 insertions, 35 deletions

diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index 5332014..f4971cd 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -31,8 +31,8 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
 	unsigned int hdrlen;
 	struct ieee80211_hdr *hdr;
 	struct sk_buff *skb = tx->skb;
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 	int authenticator;
-	int wpa_test = 0;
 	int tail;
 
 	hdr = (struct ieee80211_hdr *)skb->data;
@@ -47,16 +47,15 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
 	data = skb->data + hdrlen;
 	data_len = skb->len - hdrlen;
 
-	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
+	if (info->control.hw_key &&
 	    !(tx->flags & IEEE80211_TX_FRAGMENTED) &&
-	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
-	    !wpa_test) {
-		/* hwaccel - with no need for preallocated room for MMIC */
+	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
+		/* hwaccel - with no need for SW-generated MMIC */
 		return TX_CONTINUE;
 	}
 
 	tail = MICHAEL_MIC_LEN;
-	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
+	if (!info->control.hw_key)
 		tail += TKIP_ICV_LEN;
 
 	if (WARN_ON(skb_tailroom(skb) < tail ||
@@ -147,17 +146,16 @@ static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
 	int len, tail;
 	u8 *pos;
 
-	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
-	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
-		/* hwaccel - with no need for preallocated room for IV/ICV */
-		info->control.hw_key = &tx->key->conf;
+	if (info->control.hw_key &&
+	    !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
+		/* hwaccel - with no need for software-generated IV */
 		return 0;
 	}
 
 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
 	len = skb->len - hdrlen;
 
-	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
+	if (info->control.hw_key)
 		tail = 0;
 	else
 		tail = TKIP_ICV_LEN;
@@ -175,13 +173,11 @@ static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
 	if (key->u.tkip.tx.iv16 == 0)
 		key->u.tkip.tx.iv32++;
 
-	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
-		/* hwaccel - with preallocated room for IV */
-		ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
+	pos = ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
 
-		info->control.hw_key = &tx->key->conf;
+	/* hwaccel - with software IV */
+	if (info->control.hw_key)
 		return 0;
-	}
 
 	/* Add room for ICV */
 	skb_put(skb, TKIP_ICV_LEN);
@@ -363,24 +359,20 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
 	int hdrlen, len, tail;
 	u8 *pos, *pn;
 	int i;
-	bool skip_hw;
-
-	skip_hw = (tx->key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT) &&
-		ieee80211_is_mgmt(hdr->frame_control);
 
-	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
-	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
-	    !skip_hw) {
-		/* hwaccel - with no need for preallocated room for CCMP
-		 * header or MIC fields */
-		info->control.hw_key = &tx->key->conf;
+	if (info->control.hw_key &&
+	    !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
+		/*
+		 * hwaccel has no need for preallocated room for CCMP
+		 * header or MIC fields
+		 */
 		return 0;
 	}
 
 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
 	len = skb->len - hdrlen;
 
-	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
+	if (info->control.hw_key)
 		tail = 0;
 	else
 		tail = CCMP_MIC_LEN;
@@ -405,11 +397,9 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
 
 	ccmp_pn2hdr(pos, pn, key->conf.keyidx);
 
-	if ((key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && !skip_hw) {
-		/* hwaccel - with preallocated room for CCMP header */
-		info->control.hw_key = &tx->key->conf;
+	/* hwaccel - with software CCMP header */
+	if (info->control.hw_key)
 		return 0;
-	}
 
 	pos += CCMP_HDR_LEN;
 	ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
@@ -525,11 +515,8 @@ ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
 	u8 *pn, aad[20];
 	int i;
 
-	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
-		/* hwaccel */
-		info->control.hw_key = &tx->key->conf;
+	if (info->control.hw_key)
 		return 0;
-	}
 
 	if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
 		return TX_DROP;