[ath9k-devel] Fully control ethernet frame

hi,

for ath9k_htc devices you have to hack the TX descriptor setup in the
firmware, rather than in ath9k_htc.



-adrian


On 13 July 2016 at 01:52, SangHyuk Kim <[email protected]> wrote:

> Dear Adrian.
>
> Thanks for your reply.
>
> I could check the point you mentioned, but when I tried to modify source
> code(ar9002.c) and rebuild it didn't any effects.
>
> And I realized that my wifi usb uses ath9k_htc things.
>
> So I'm researching about htc_*.c things, but I can't find any crew clue.
>
> My new questions :
>
> 1) How can I corrupt CRC/FCS using htc driver product
> 2) Also, what is the 'txok' variable in htc_drv_txrx.c :
>
> [image: ?? ??? 1]
>
> Any replies, thanks.
>
> 2016-07-09 8:56 GMT+09:00 Adrian Chadd <[email protected]>:
>
>> On 8 July 2016 at 10:55, Ben Greear <[email protected]> wrote:
>> > On 07/08/2016 10:46 AM, Adrian Chadd wrote:
>> >>
>> >> hi,
>> >>
>> >> There's a transmit descriptor bit, AR_CorruptFCS, which you can set
>> >> and it will negate the FCS so it always fails.
>> >>
>> >> Look in the ar9002_mac.c / ar9003_mac.c where NoAck is set; i think
>> >> AR_CorruptFCS should also be set in that (ctl1 for ar9002 and below,
>> >> ctl12 for ar9003)
>> >
>> >
>> > Neat.
>> >
>> > e1000e (I think?) and some other drivers I mucked with long ago have
>> > the ability to accept FCS from user-space.  If someone adds that
>> > same support to ath9k then that would make applications supporting
>> > this API able to work on ath9k devices as well...
>>
>> I don't know if we can disable hardware FCS calculation. :-) It looks
>> like we can only make it be corrupted, for testing.
>>
>>
>>
>> -adrian
>>
>> >
>> > Thanks,
>> > Ben
>> >
>> >
>> >>
>> >>
>> >> -a
>> >>
>> >>
>> >> On 8 July 2016 at 00:08, ??? <[email protected]> wrote:
>> >>>
>> >>> Hi all,
>> >>>
>> >>> I want to make corrupted packet by wrong CRC/FCS
>> >>>
>> >>> I have two questions.
>> >>>
>> >>> 1) Can I handle CRC/FCS when ethernet frame be made at Tx ?
>> >>>
>> >>> 2-1) If can, how can I ? or where is related source?
>> >>>
>> >>> 2-2) If can?t, is there any way to control CRC/FCS at Tx ?
>> >>>
>> >>> Thanks.
>> >>> _______________________________________________
>> >>> ath9k-devel mailing list
>> >>> ath9k-devel at lists.ath9k.org
>> >>> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>> >>
>> >> _______________________________________________
>> >> ath9k-devel mailing list
>> >> ath9k-devel at lists.ath9k.org
>> >> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>> >>
>> >
>> >
>> > --
>> > Ben Greear <[email protected]>
>> > Candela Technologies Inc  http://www.candelatech.com
>> >
>>
>
>
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