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From: Roberto Riggio <roberto.riggio-2TmCWn7/>
To: Johannes Berg <>
Subject: Re: Fields alignment when extended mask is present
Date: Mon, 21 Feb 2011 11:11:42 +0100
Message-ID: <> (raw)
In-Reply-To: <>

Il 21/02/2011 10:50, Johannes Berg ha scritto:
> On Mon, 2011-02-21 at 10:47 +0100, Roberto Riggio wrote:
>>>> rate_1 (8)
>>>> retry _1 (8)
>>>> rate_2 (8)
>>>> retry _2 (8)
>>> What's with the "(8)"? Generally, anything in the data portion of
>>> radiotap needs to be padded to the right position.
>> (8) was the field length. in the example above i;ve repoted
>> two different radiotap headers where i specify twice the rate
>> and the retries field.
>> of course i know that in this case i will have to put to it-present
>> bitmasks and i will have to set the bit 31 of the first bitmask to 1.
>> what i'm not sure is if i have to pad the first "block" to the word
>> boundary or not.
> I still don't get it. If the field length is 8 bits (1 byte) you don't
> need any alignment anyway.
Ok thanks this is what i wasn;t sure of.
> johannes

Roberto Riggio, Ph.D.
Network&  Security Solutions for Pervasive Computing Systems (iNSPIRE)
Senior Researcher
Via alla Cascata 56/D - 38123 Povo Trento (Italy)
e-mail: roberto.riggio-2TmCWn7/
Tel: (+39) 0461 408400 - interno/extension 708
Fax: (+39) 0461 421157

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      parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-20 10:55 Roberto Riggio
     [not found] ` <4D60F317.8090007-2TmCWn7/>
2011-02-21  9:27   ` Johannes Berg
     [not found]     ` <>
2011-02-21  9:47       ` Roberto Riggio
     [not found]         ` <4D6234C5.2020201-2TmCWn7/>
2011-02-21  9:50           ` Johannes Berg
     [not found]             ` <>
2011-02-21 10:11               ` Roberto Riggio [this message]

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