Handling RADIOTAP_EXT

Handling RADIOTAP_EXT

[Roberto Riggio]

Hi,

I have a radiotap header with extended namespaces. Basically in each on 
them I define a rate (either legacy or mcs) and a retry count.

I can correctly iterate over the header using the reference lib, however 
I could not figure it out how to keep known the namespace index 
currently being parsed.

Thanks

-- 
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Roberto Riggio, Ph.D.
CREATE-NET
Network & Security Solutions for Pervasive Computing Systems (iNSPIRE)
Senior Researcher
Via alla Cascata 56/D - 38123 Povo Trento (Italy)
e-mail: roberto.riggio-2TmCWn7/4sHOQU1ULcgDhA@public.gmane.org
Tel: (+39) 0461 408400 - interno/extension 708
Fax: (+39) 0461 421157
www.create-net.org/~rriggio
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Re: Handling RADIOTAP_EXT

[Johannes Berg]

Hi

> I have a radiotap header with extended namespaces. Basically in each on 
> them I define a rate (either legacy or mcs) and a retry count.

Makes sense.

> I can correctly iterate over the header using the reference lib, however 
> I could not figure it out how to keep known the namespace index 
> currently being parsed.

Can you elaborate what you mean? Do you want to keep something while
using the library?

johannes

Re: Handling RADIOTAP_EXT

[Roberto Riggio]

On 03/07/2012 09:10 AM, Johannes Berg wrote:
> Can you elaborate what you mean? Do you want to keep something while
> using the library?

Let's assume that I'm the the following situation:

---
RATE (1) 54 Mbps
COUNT (1) 3
---
RATE (2) 18 Mbps
COUNT (2) 3
---
RATE (3) 6 Mbps
COUNT (3) 3
---

When I'm iterating over the header I could keep track of the namespace 
by incrementing an index after I have found the RETRIES field. This will 
work because the RETRIES field is always after the RATE field so my 
index is consistent.

On the other hand, if in the header MCS and RETRIES the approach above 
will not work, since the MCS field is after the RETRIES field.

So I was wondering if there is a way, while iterating over an header, to 
known how many time the RADIOTAP_NAMESPACE (or the EXT) field has been 
found.

> johannes
R.

Re: Handling RADIOTAP_EXT

[Johannes Berg]

On Wed, 2012-03-07 at 09:20 +0100, Roberto Riggio wrote:
> On 03/07/2012 09:10 AM, Johannes Berg wrote:
> > Can you elaborate what you mean? Do you want to keep something while
> > using the library?
> 
> Let's assume that I'm the the following situation:
> 
> ---
> RATE (1) 54 Mbps
> COUNT (1) 3
> ---
> RATE (2) 18 Mbps
> COUNT (2) 3
> ---
> RATE (3) 6 Mbps
> COUNT (3) 3
> ---
> 
> When I'm iterating over the header I could keep track of the namespace 
> by incrementing an index after I have found the RETRIES field. This will 
> work because the RETRIES field is always after the RATE field so my 
> index is consistent.
> 
> On the other hand, if in the header MCS and RETRIES the approach above 
> will not work, since the MCS field is after the RETRIES field.
> 
> So I was wondering if there is a way, while iterating over an header, to 
> known how many time the RADIOTAP_NAMESPACE (or the EXT) field has been 
> found.

Ah, no, not with the library as it is today. I suppose we could add a
flag "inform me of namespace boundaries" or something like that.

johannes