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>

diff --git a/net/mac80211/tkip.c b/net/mac80211/tkip.c
index b73454a507f9cfd2dc89b45bac88352d32c75f2c..14fe49332c02f5c472b9342393b9a85e1d08ce55 100644 (file)
--- a/net/mac80211/tkip.c
+++ b/net/mac80211/tkip.c
@@ -195,11 +195,13 @@ void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
 }
 EXPORT_SYMBOL(ieee80211_get_tkip_key);
 
-/* Encrypt packet payload with TKIP using @key. @pos is a pointer to the
+/*
+ * Encrypt packet payload with TKIP using @key. @pos is a pointer to the
  * beginning of the buffer containing payload. This payload must include
- * headroom of eight octets for IV and Ext. IV and taildroom of four octets
- * for ICV. @payload_len is the length of payload (_not_ including extra
- * headroom and tailroom). @ta is the transmitter addresses. */
+ * the IV/Ext.IV and space for (taildroom) four octets for ICV.
+ * @payload_len is the length of payload (_not_ including IV/ICV length).
+ * @ta is the transmitter addresses.
+ */
 void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
                                 struct ieee80211_key *key,
                                 u8 *pos, size_t payload_len, u8 *ta)
@@ -214,7 +216,6 @@ void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
 
        tkip_mixing_phase2(tk, ctx, ctx->iv16, rc4key);
 
-       pos = ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
        ieee80211_wep_encrypt_data(tfm, rc4key, 16, pos, payload_len);
 }
 

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 9afbee0d53c0c6bed2956e4f4ec2808367b3e3a5..e3d8ff533ee6635831db885f8f6b263504b26920 100644 (file)
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -529,6 +529,8 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
                tx->key = NULL;
 
        if (tx->key) {
+               bool skip_hw = false;
+
                tx->key->tx_rx_count++;
                /* TODO: add threshold stuff again */
 
@@ -545,12 +547,19 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
                            !ieee80211_use_mfp(hdr->frame_control, tx->sta,
                                               tx->skb))
                                tx->key = NULL;
+                       skip_hw = (tx->key->conf.flags &
+                                               IEEE80211_KEY_FLAG_SW_MGMT) &&
+                                  ieee80211_is_mgmt(hdr->frame_control);
                        break;
                case ALG_AES_CMAC:
                        if (!ieee80211_is_mgmt(hdr->frame_control))
                                tx->key = NULL;
                        break;
                }
+
+               if (!skip_hw &&
+                   tx->key->conf.flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
+                       info->control.hw_key = &tx->key->conf;
        }
 
        return TX_CONTINUE;

diff --git a/net/mac80211/wep.c b/net/mac80211/wep.c
index 247123fe1a7a6307aa41a7fea01a7378ccec53e3..0a4c641c960537c8a93ec3190927c3f484969490 100644 (file)
--- a/net/mac80211/wep.c
+++ b/net/mac80211/wep.c
@@ -305,20 +305,20 @@ static int wep_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
 {
        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 
-       if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
+       if (!info->control.hw_key) {
                if (ieee80211_wep_encrypt(tx->local, skb, tx->key->conf.key,
                                          tx->key->conf.keylen,
                                          tx->key->conf.keyidx))
                        return -1;
-       } else {
-               info->control.hw_key = &tx->key->conf;
-               if (tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) {
-                       if (!ieee80211_wep_add_iv(tx->local, skb,
-                                                 tx->key->conf.keylen,
-                                                 tx->key->conf.keyidx))
-                               return -1;
-               }
        }
+
+       if (info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) {
+               if (!ieee80211_wep_add_iv(tx->local, skb,
+                                         tx->key->conf.keylen,
+                                         tx->key->conf.keyidx))
+                       return -1;
+       }
+
        return 0;
 }
 

diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index 5332014cb22915c20a1f3015ea80f2bb59077833..f4971cd45c64f53eaa248680ca965a471abb7564 100644 (file)
--- 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;