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rt2500usb: fallback to SW encryption for TKIP+AES

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HW crypto in rt2500usb does not seem to support keys with different ciphers,
which breaks TKIP+AES mode. Fall back to software encryption to fix it.

This should fix long-standing problems with rt2500usb and WPA, such as:
http://rt2x00.serialmonkey.com/phpBB/viewtopic.php?f=4&t=4834
https://bugzilla.redhat.com/show_bug.cgi?id=484888

Also tested that it does not break WEP, TKIP-only and AES-only modes.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ondrej Zary 2010-06-23 12:57:15 +02:00 committed by John W. Linville
parent 98d2ff8bec
commit 75f64dd54a
1 changed files with 10 additions and 0 deletions
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10
drivers/net/wireless/rt2x00/rt2500usb.c
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@ -347,6 +347,7 @@ static int rt2500usb_config_key(struct rt2x00_dev *rt2x00dev,
{
u32 mask;
u16 reg;
enum cipher curr_cipher;
if (crypto->cmd == SET_KEY) {
/*
@ -357,6 +358,7 @@ static int rt2500usb_config_key(struct rt2x00_dev *rt2x00dev,
mask = TXRX_CSR0_KEY_ID.bit_mask;
rt2500usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
curr_cipher = rt2x00_get_field16(reg, TXRX_CSR0_ALGORITHM);
reg &= mask;
if (reg && reg == mask)
@ -365,6 +367,14 @@ static int rt2500usb_config_key(struct rt2x00_dev *rt2x00dev,
reg = rt2x00_get_field16(reg, TXRX_CSR0_KEY_ID);
key->hw_key_idx += reg ? ffz(reg) : 0;
/*
* Hardware requires that all keys use the same cipher
* (e.g. TKIP-only, AES-only, but not TKIP+AES).
* If this is not the first key, compare the cipher with the
* first one and fall back to SW crypto if not the same.
*/
if (key->hw_key_idx > 0 && crypto->cipher != curr_cipher)
return -EOPNOTSUPP;
rt2500usb_register_multiwrite(rt2x00dev, reg,
crypto->key, sizeof(crypto->key));