How to use software encryption with WEP and mac80211

How to use software encryption with WEP and mac80211

[Larry Finger]

What do I need to do to get mac80211 to do software encryption for WEP? My port of the PHY code from 
bcm43xx and the mac80211 front end works with WPA encryption. With WEP, it authenticates and 
associates, but never gets an IP number from DHCP. That indicates to me that the encryption is not 
set up correctly. I looked through the various definitions in include/net/mac80211.h, but nothing 
seems to apply.

Thanks,

Larry

Re: How to use software encryption with WEP and mac80211

[Michael Buesch]

On Saturday 11 August 2007 05:25:11 Larry Finger wrote:
> What do I need to do to get mac80211 to do software encryption for WEP? My port of the PHY code from 
> bcm43xx and the mac80211 front end works with WPA encryption. With WEP, it authenticates and 
> associates, but never gets an IP number from DHCP. That indicates to me that the encryption is not 
> set up correctly. I looked through the various definitions in include/net/mac80211.h, but nothing 
> seems to apply.

Which hw enc code do you use in that tree? The old softmac crap
or my new code from bcm43xx-mac80211?

Anyway, if you want to disable hw enc, always set the force sw enc bit
in the set_key function and return early:

	key->flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
	return 0;

-- 
Greetings Michael.

Re: How to use software encryption with WEP and mac80211

[Larry Finger]

Michael Buesch wrote:
> On Saturday 11 August 2007 05:25:11 Larry Finger wrote:
>> What do I need to do to get mac80211 to do software encryption for WEP? My port of the PHY code from 
>> bcm43xx and the mac80211 front end works with WPA encryption. With WEP, it authenticates and 
>> associates, but never gets an IP number from DHCP. That indicates to me that the encryption is not 
>> set up correctly. I looked through the various definitions in include/net/mac80211.h, but nothing 
>> seems to apply.
> 
> Which hw enc code do you use in that tree? The old softmac crap
> or my new code from bcm43xx-mac80211?

I had stripped out all the key stuff, but before that it was from bcm43xx-mac80211.

> Anyway, if you want to disable hw enc, always set the force sw enc bit
> in the set_key function and return early:
> 
> 	key->flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
> 	return 0;

This doesn't seem to work. I had tried it before. I guess I put your code back in again.

Thanks,

Larry

Re: How to use software encryption with WEP and mac80211

[Michael Buesch]

On Saturday 11 August 2007 17:05:28 Larry Finger wrote:
> Michael Buesch wrote:
> > On Saturday 11 August 2007 05:25:11 Larry Finger wrote:
> >> What do I need to do to get mac80211 to do software encryption for WEP? My port of the PHY code from 
> >> bcm43xx and the mac80211 front end works with WPA encryption. With WEP, it authenticates and 
> >> associates, but never gets an IP number from DHCP. That indicates to me that the encryption is not 
> >> set up correctly. I looked through the various definitions in include/net/mac80211.h, but nothing 
> >> seems to apply.
> > 
> > Which hw enc code do you use in that tree? The old softmac crap
> > or my new code from bcm43xx-mac80211?
> 
> I had stripped out all the key stuff, but before that it was from bcm43xx-mac80211.
> 
> > Anyway, if you want to disable hw enc, always set the force sw enc bit
> > in the set_key function and return early:
> > 
> > 	key->flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
> > 	return 0;
> 
> This doesn't seem to work. I had tried it before. I guess I put your code back in again.

bcm43xx-mac80211 hwenc code does not work with v3 firmware.
There is no working hwenc code for v3 firmware.

The above code should work to enable swenc, unless there's a bug in mac80211.


-- 
Greetings Michael.

Re: How to use software encryption with WEP and mac80211

[Larry Finger]

Michael Buesch wrote:
> On Saturday 11 August 2007 17:05:28 Larry Finger wrote:
>> This doesn't seem to work. I had tried it before. I guess I put your code back in again.
> 
> bcm43xx-mac80211 hwenc code does not work with v3 firmware.
> There is no working hwenc code for v3 firmware.
> 
> The above code should work to enable swenc, unless there's a bug in mac80211.

Thanks. That saves a lot of work. Now I know where to look.

Larry

Re: How to use software encryption with WEP and mac80211

[Larry Finger]

Michael Buesch wrote:
> On Saturday 11 August 2007 17:05:28 Larry Finger wrote:
>> Michael Buesch wrote:
>>> On Saturday 11 August 2007 05:25:11 Larry Finger wrote:
>>>> What do I need to do to get mac80211 to do software encryption for WEP? My port of the PHY code from 
>>>> bcm43xx and the mac80211 front end works with WPA encryption. With WEP, it authenticates and 
>>>> associates, but never gets an IP number from DHCP. That indicates to me that the encryption is not 
>>>> set up correctly. I looked through the various definitions in include/net/mac80211.h, but nothing 
>>>> seems to apply.
>>> Which hw enc code do you use in that tree? The old softmac crap
>>> or my new code from bcm43xx-mac80211?
>> I had stripped out all the key stuff, but before that it was from bcm43xx-mac80211.
>>
>>> Anyway, if you want to disable hw enc, always set the force sw enc bit
>>> in the set_key function and return early:
>>>
>>> 	key->flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
>>> 	return 0;
>> This doesn't seem to work. I had tried it before. I guess I put your code back in again.
> 
> bcm43xx-mac80211 hwenc code does not work with v3 firmware.
> There is no working hwenc code for v3 firmware.
> 
> The above code should work to enable swenc, unless there's a bug in mac80211.

It wasn't a bug in mac80211. In fact, it forces software encryption if the set_key callback is not 
specified. My problem was that the hw->flags were wrong in the initial registration of the iface. 
Both WEP and WPA are working now.

Larry