Messages in this thread Patch in this message |  | | | Date | Thu, 05 May 2011 17:21:59 -0700 | | From | Greg KH <> | | Subject | [134/143] rt2500usb: fallback to SW encryption for TKIP+AES |
| |
2.6.32-longterm review patch. If anyone has any objections, please let us know.
------------------ From: Ondrej Zary <linux@rainbow-software.org>
commit 75f64dd54a185150ebfc45e99351c890d4a2252f upstream.
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> [bwh: Adjust context for 2.6.32] Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- drivers/net/wireless/rt2x00/rt2500usb.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/drivers/net/wireless/rt2x00/rt2500usb.c +++ b/drivers/net/wireless/rt2x00/rt2500usb.c @@ -347,6 +347,7 @@ static int rt2500usb_config_key(struct r int timeout; u32 mask; u16 reg; + enum cipher curr_cipher; if (crypto->cmd == SET_KEY) { /* @@ -357,6 +358,7 @@ static int rt2500usb_config_key(struct r mask = TXRX_CSR0_KEY_ID.bit_mask; rt2500usb_register_read(rt2x00dev, TXRX_CSR0, ®); + 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 r 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; /* * The encryption key doesn't fit within the CSR cache,
|  |