lib80211: Introduce TKIP_HDR_LEN define for code clarity

Introduce TKIP_HDR_LEN define for code clarity (in the same way as
CCMP_HDR_LEN).

Also odd len variable (not used) dropped from lib80211_tkip_hdr().

Signed-off-by: Andriy V. Tkachuk <andrit@ukr.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/wireless/lib80211_crypt_tkip.c b/net/wireless/lib80211_crypt_tkip.c
index c6a3cae..8cbdb32 100644 (file)
--- a/net/wireless/lib80211_crypt_tkip.c
+++ b/net/wireless/lib80211_crypt_tkip.c
@@ -36,6 +36,8 @@ MODULE_AUTHOR("Jouni Malinen");
 MODULE_DESCRIPTION("lib80211 crypt: TKIP");
 MODULE_LICENSE("GPL");
 
+#define TKIP_HDR_LEN 8
+
 struct lib80211_tkip_data {
 #define TKIP_KEY_LEN 32
        u8 key[TKIP_KEY_LEN];
@@ -314,13 +316,12 @@ static int lib80211_tkip_hdr(struct sk_buff *skb, int hdr_len,
                              u8 * rc4key, int keylen, void *priv)
 {
        struct lib80211_tkip_data *tkey = priv;
-       int len;
        u8 *pos;
        struct ieee80211_hdr *hdr;
 
        hdr = (struct ieee80211_hdr *)skb->data;
 
-       if (skb_headroom(skb) < 8 || skb->len < hdr_len)
+       if (skb_headroom(skb) < TKIP_HDR_LEN || skb->len < hdr_len)
                return -1;
 
        if (rc4key == NULL || keylen < 16)
@@ -333,9 +334,8 @@ static int lib80211_tkip_hdr(struct sk_buff *skb, int hdr_len,
        }
        tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, tkey->tx_iv16);
 
-       len = skb->len - hdr_len;
-       pos = skb_push(skb, 8);
-       memmove(pos, pos + 8, hdr_len);
+       pos = skb_push(skb, TKIP_HDR_LEN);
+       memmove(pos, pos + TKIP_HDR_LEN, hdr_len);
        pos += hdr_len;
 
        *pos++ = *rc4key;
@@ -353,7 +353,7 @@ static int lib80211_tkip_hdr(struct sk_buff *skb, int hdr_len,
                tkey->tx_iv32++;
        }
 
-       return 8;
+       return TKIP_HDR_LEN;
 }
 
 static int lib80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
@@ -433,7 +433,7 @@ static int lib80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
                return -1;
        }
 
-       if (skb->len < hdr_len + 8 + 4)
+       if (skb->len < hdr_len + TKIP_HDR_LEN + 4)
                return -1;
 
        pos = skb->data + hdr_len;
@@ -461,7 +461,7 @@ static int lib80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
        }
        iv16 = (pos[0] << 8) | pos[2];
        iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24);
-       pos += 8;
+       pos += TKIP_HDR_LEN;
 
        if (tkip_replay_check(iv32, iv16, tkey->rx_iv32, tkey->rx_iv16)) {
 #ifdef CONFIG_LIB80211_DEBUG
@@ -522,8 +522,8 @@ static int lib80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
        tkey->rx_iv16_new = iv16;
 
        /* Remove IV and ICV */
-       memmove(skb->data + 8, skb->data, hdr_len);
-       skb_pull(skb, 8);
+       memmove(skb->data + TKIP_HDR_LEN, skb->data, hdr_len);
+       skb_pull(skb, TKIP_HDR_LEN);
        skb_trim(skb, skb->len - 4);
 
        return keyidx;