Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6

[powerpc.git] / net / ieee80211 / ieee80211_crypt_wep.c

diff --git a/net/ieee80211/ieee80211_crypt_wep.c b/net/ieee80211/ieee80211_crypt_wep.c
index 073aebd..f8dca31 100644 (file)
--- a/net/ieee80211/ieee80211_crypt_wep.c
+++ b/net/ieee80211/ieee80211_crypt_wep.c
@@ -75,22 +75,14 @@ static void prism2_wep_deinit(void *priv)
        kfree(priv);
 }
 
-/* Perform WEP encryption on given skb that has at least 4 bytes of headroom
- * for IV and 4 bytes of tailroom for ICV. Both IV and ICV will be transmitted,
- * so the payload length increases with 8 bytes.
- *
- * WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data))
- */
-static int prism2_wep_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+/* Add WEP IV/key info to a frame that has at least 4 bytes of headroom */
+static int prism2_wep_build_iv(struct sk_buff *skb, int hdr_len, void *priv)
 {
        struct prism2_wep_data *wep = priv;
-       u32 crc, klen, len;
-       u8 key[WEP_KEY_LEN + 3];
-       u8 *pos, *icv;
-       struct scatterlist sg;
-
-       if (skb_headroom(skb) < 4 || skb_tailroom(skb) < 4 ||
-           skb->len < hdr_len)
+       u32 klen, len;
+       u8 *pos;
+       
+       if (skb_headroom(skb) < 4 || skb->len < hdr_len)
                return -1;
 
        len = skb->len - hdr_len;
@@ -112,15 +104,47 @@ static int prism2_wep_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
        }
 
        /* Prepend 24-bit IV to RC4 key and TX frame */
-       *pos++ = key[0] = (wep->iv >> 16) & 0xff;
-       *pos++ = key[1] = (wep->iv >> 8) & 0xff;
-       *pos++ = key[2] = wep->iv & 0xff;
+       *pos++ = (wep->iv >> 16) & 0xff;
+       *pos++ = (wep->iv >> 8) & 0xff;
+       *pos++ = wep->iv & 0xff;
        *pos++ = wep->key_idx << 6;
 
+       return 0;
+}
+
+/* Perform WEP encryption on given skb that has at least 4 bytes of headroom
+ * for IV and 4 bytes of tailroom for ICV. Both IV and ICV will be transmitted,
+ * so the payload length increases with 8 bytes.
+ *
+ * WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data))
+ */
+static int prism2_wep_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+       struct prism2_wep_data *wep = priv;
+       u32 crc, klen, len;
+       u8 *pos, *icv;
+       struct scatterlist sg;
+       u8 key[WEP_KEY_LEN + 3];
+
+       /* other checks are in prism2_wep_build_iv */
+       if (skb_tailroom(skb) < 4)
+               return -1;
+       
+       /* add the IV to the frame */
+       if (prism2_wep_build_iv(skb, hdr_len, priv))
+               return -1;
+       
+       /* Copy the IV into the first 3 bytes of the key */
+       memcpy(key, skb->data + hdr_len, 3);
+
        /* Copy rest of the WEP key (the secret part) */
        memcpy(key + 3, wep->key, wep->key_len);
+       
+       len = skb->len - hdr_len - 4;
+       pos = skb->data + hdr_len + 4;
+       klen = 3 + wep->key_len;
 
-       /* Append little-endian CRC32 and encrypt it to produce ICV */
+       /* Append little-endian CRC32 over only the data and encrypt it to produce ICV */
        crc = ~crc32_le(~0, pos, len);
        icv = skb_put(skb, 4);
        icv[0] = crc;
@@ -231,6 +255,7 @@ static struct ieee80211_crypto_ops ieee80211_crypt_wep = {
        .name = "WEP",
        .init = prism2_wep_init,
        .deinit = prism2_wep_deinit,
+       .build_iv = prism2_wep_build_iv,
        .encrypt_mpdu = prism2_wep_encrypt,
        .decrypt_mpdu = prism2_wep_decrypt,
        .encrypt_msdu = NULL,