2010/5/7 Roberto Riggio <roberto.riggio@xxxxxxxxxxxxxx>:
> Hi,
>
> well, that is what i wanted to understand. These are the struct
> that I'm using to compose the rediotap header:
>
> struct ieee80211_radiotap_header {
> u_int8_t it_version;
> u_int8_t it_pad;
> u_int16_t it_len;
> u_int32_t it_present;
AFAIK these 2 fields need to be little-endian even on big-endian
machines. If your system is big-endian, this can cause problems.
> } __attribute__((__packed__));
>
> struct click_radiotap_header {
> struct ieee80211_radiotap_header wt_ihdr;
> u_int8_t wt_rate;
> u_int8_t wt_txpower;
> u_int8_t wt_rts_retries;
> u_int8_t wt_data_retries;
> };
>
> The flags are set in order to take into account the fields that I
> specify. But i do not know at which point the frame are
> dropped.
>
> R.
>
> On 05/07/2010 06:35 PM, Gábor Stefanik wrote:
>>
>> Hi!
>> Are you sure it is not your injector that is having alignment issues?
>> AFAIK the radiotap parser explicitly uses endianness-aware function
>> everywhere.
>>
>> On Fri, May 7, 2010 at 6:13 PM, Roberto Riggio
>> <roberto.riggio@xxxxxxxxxxxxxx> wrote:
>>
>>>
>>> Hi,
>>>
>>> I'm writing an application to inject traffic over a wireless interface.
>>> This
>>> app
>>> is working fine on an x86 machine. However if i compile the same app for
>>> an arm platform, no frame are sent over the wireless interface (ath9k).
>>>
>>> I'm guessing that this is because of some alignment issues but i cannot
>>> track
>>> the piece of code that is actually parsing the frame. I've found the
>>> __ieee80211_parse_tx_radiotap in net/mac80211/tx.c function, but it is
>>> not called when i try to inject some traffic, so the frame are dropped
>>> before that.
>>>
>>> Any hints?
>>>
>>> Thanks
>>> R.
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>>>
>>
>>
>>
>
>
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