From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mats Johannesson <spamcan1@abrasax.se>
Date: Thu, 18 Sep 2008 04:46:18 +0200
Subject: [ath9k-devel] ath9k constantly drops network connection
In-Reply-To: <20080917191003.GC6198@tesla>
References: <e14212e0809170305v46b0c512i63c1a2874e730274@mail.gmail.com>
	<20080917191003.GC6198@tesla>
Message-ID: <20080918044618.0cd64cd9@loke.fish.not>
List-Id: <ath9k-devel.lists.ath9k.org>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: ath9k-devel@lists.ath9k.org

On Wed, 17 Sep 2008 12:10:03 -0700 Luis R. Rodriguez wrote:
> On Wed, Sep 17, 2008 at 03:05:59AM -0700, Partha Bagchi wrote:
[...]
> > 03:42:27 EDT 2008 i686 i686 i386 GNU/Linux
> 
> Please try appling the patch titled:
> 
> "[PATCH] ath9k: connectivity is lost after Group rekeying is done"
> 
> which was posted on linux-wireless. If that fixes your issue I can

A question Luis. Looking at the code (and not knowing _anything_ about
wireless internals):

-		if (sc->sc_keytype == ATH9K_CIPHER_WEP)
+		if (tx_info->control.hw_key->alg == ALG_WEP)
 			txctl->keytype = ATH9K_KEY_TYPE_WEP;
-		else if (sc->sc_keytype == ATH9K_CIPHER_TKIP)
+		else if (tx_info->control.hw_key->alg == ALG_TKIP)
 			txctl->keytype = ATH9K_KEY_TYPE_TKIP;
-		else if (sc->sc_keytype == ATH9K_CIPHER_AES_CCM)
+		else if (tx_info->control.hw_key->alg == ALG_CCMP)
 			txctl->keytype = ATH9K_KEY_TYPE_AES;

I'm confused regarding the AES cypher. My AP is set through its
interface as:

Security Mode: WPA-Personal
WPA Mode: WPA2 Only
Cipher Type: AES
Group Key Update Interval: 2461 seconds (~41 minutes)
Pre-Shared Key: Loooong long key.

But the output from "iwlist scan" tells another story:

                    Encryption key:on
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (1) : TKIP
                        Authentication Suites (1) : PSK

So someones lying... Does this effect ath9k?

I'll compile another kernel and try to get rid of TKIP stuff completely
to test this out. At the moment the environment looks like this:

grep -i tkip my-.config
grep -i michael my-.config
# CONFIG_CRYPTO_MICHAEL_MIC is not set
grep -i ecb my-.config
CONFIG_CRYPTO_ECB=m
grep -i aes my-.config
CONFIG_CRYPTO_AES=m
CONFIG_CRYPTO_AES_X86_64=m

loke at sleipner:~$ lsmod|grep -i ecb
ecb                     1344  2
crypto_blkcipher        8964  1 ecb
crypto_algapi           6336  6 aes_x86_64,aes_generic,arc4,ecb,crypto_blkcipher,cryptomgr

loke at sleipner:~$ lsmod|grep -i aes
aes_x86_64              6784  3
aes_generic            25576  1 aes_x86_64
crypto_algapi           6336  6 aes_x86_64,aes_generic,arc4,ecb,crypto_blkcipher,cryptomgr

Perhaps I'll break ath9k if the kernel lets me compile without an ecb
module...

Mvh
Mats Johannesson