OpenSDV
/
linux-stable-rt
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ath5k: clean up ath5k_hw_set_key 

Status: O

With the addition of TKIP (and soon CCMP), key->alg is a more useful
guide to key type than the key length.

This patch cleans up key type assignment in ath5k_hw_set_key by
extracting it into its own function.  It also replaces the separate
memcpy() calls for extracting key material into the hardware format
with a loop that works regardless of key size.

Finally, the patch removes support for WEP-128 since it is a
non-standard key length that mac80211 also doesn't use.

Changes-licensed-under: ISC
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bob Copeland 2008-11-25 20:55:21 -05:00 committed by John W. Linville
parent f6bac3ea59
commit 6714349046
1 changed files with 34 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/net/wireless/ath5k/pcu.c
View File

@ -1013,6 +1013,23 @@ int ath5k_hw_is_key_valid(struct ath5k_hw *ah, u16 entry)
AR5K_KEYTABLE_VALID;
}
static
int ath5k_keycache_type(const struct ieee80211_key_conf *key)
{
switch (key->alg) {
case ALG_TKIP:
return AR5K_KEYTABLE_TYPE_TKIP;
case ALG_CCMP:
return AR5K_KEYTABLE_TYPE_CCM;
case ALG_WEP:
if (key->keylen == LEN_WEP40)
return AR5K_KEYTABLE_TYPE_40;
else if (key->keylen == LEN_WEP104)
return AR5K_KEYTABLE_TYPE_104;
}
return -EINVAL;
}
/*
* Set a key entry on the table
*/
@ -1027,6 +1044,7 @@ int ath5k_hw_set_key(struct ath5k_hw *ah, u16 entry,
u32 keytype;
u16 micentry = entry + AR5K_KEYTABLE_MIC_OFFSET;
bool is_tkip;
const u8 *key_ptr;
ATH5K_TRACE(ah->ah_sc);
@ -1042,33 +1060,25 @@ int ath5k_hw_set_key(struct ath5k_hw *ah, u16 entry,
(is_tkip && micentry > AR5K_KEYTABLE_SIZE))
return -EOPNOTSUPP;
switch (keylen) {
/* WEP 40-bit = 40-bit entered key + 24 bit IV = 64-bit */
case 40 / 8:
memcpy(&key_v[0], key->key, 5);
keytype = AR5K_KEYTABLE_TYPE_40;
break;
if (unlikely(keylen > 16))
return -EOPNOTSUPP;
/* WEP 104-bit = 104-bit entered key + 24-bit IV = 128-bit */
case 104 / 8:
memcpy(&key_v[0], &key->key[0], 6);
memcpy(&key_v[2], &key->key[6], 6);
memcpy(&key_v[4], &key->key[12], 1);
keytype = AR5K_KEYTABLE_TYPE_104;
break;
/* WEP/TKIP 128-bit = 128-bit entered key + 24 bit IV = 152-bit */
case 128 / 8:
memcpy(&key_v[0], &key->key[0], 6);
memcpy(&key_v[2], &key->key[6], 6);
memcpy(&key_v[4], &key->key[12], 4);
keytype = is_tkip ?
AR5K_KEYTABLE_TYPE_TKIP :
AR5K_KEYTABLE_TYPE_128;
break;
keytype = ath5k_keycache_type(key);
if (keytype < 0)
return keytype;
default:
return -EINVAL; /* shouldn't happen */
/*
* each key block is 6 bytes wide, written as pairs of
* alternating 32 and 16 bit le values.
*/
key_ptr = key->key;
for (i = 0; keylen >= 6; keylen -= 6) {
memcpy(&key_v[i], key_ptr, 6);
i += 2;
key_ptr += 6;
}
if (keylen)
memcpy(&key_v[i], key_ptr, keylen);
/* intentionally corrupt key until mic is installed */
if (is_tkip) {