linux-kernel - Re: Weird wireless/wpa

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Date:	Fri, 12 Mar 2010 19:09:09 -0800
From:	Johannes Berg <johannes@...solutions.net>
To:	Valdis.Kletnieks@...edu
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: Weird wireless/wpa_supplicant screw-up.

On Fri, 2010-03-12 at 16:49 -0500, Valdis.Kletnieks@...edu wrote:

> OK, getting closer ;)

No ... you're not getting closer at all ... you ignored my second email.

> in net/wireless/wext-compat.c, we have this in cfg80211_wext_giwencode()
> after I add some printk's:
> 
> printk(KERN_INFO "In giwencode idx=%d keys=%x cipher=%x\n", idx, wdev->wext.keys, wdev->wext.keys->params[idx].cipher);
>         if (!wdev->wext.keys || !wdev->wext.keys->params[idx].cipher) {
> printk(KERN_INFO "And we're going home...\n");
>                 erq->flags |= IW_ENCODE_DISABLED;
>                 erq->length = 0;
>                 return 0;
>         }
> 
> which produces
> 
> [  151.401195] In giwencode idx=0 keys=1d023600 cipher=0
> [  151.401198] And we're going home...

No ... look at _all_ that it produces.

[   98.592575] In giwencode idx=0 keys=ffff88001b304000 cipher=0
[   98.592580] And we're going home...
*****
[   98.592633] In giwencode idx=1 keys=ffff88001b304000 cipher=fac04
*****
[   98.592749] In giwencode idx=2 keys=ffff88001b304000 cipher=0
[   98.592751] And we're going home...
[   98.592803] In giwencode idx=3 keys=ffff88001b304000 cipher=0
[   98.592805] And we're going home...
[   98.592856] In giwencode idx=0 keys=ffff88001b304000 cipher=0
[   98.592859] And we're going home...

See? It reports one key which is the RX-only group key which is
absolutely correct.

> So the root cause has something to do with params[idx].cipher being unset.

Not at all.

GIWENCODE is 100% unsuitable for WPA. Just forget about "iwlist key".
And then we'd like to know what the actual problem is.

johannes

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