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Re: [PATCH] mac80211: correct header length calculation

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On Mon, 2015-01-19 at 12:07 +0800, Fred Chou wrote:
> From: Fred Chou <fred.chou.nd@xxxxxxxxx>
> 
> HT Control field may also be present in management frames, as defined
> in 8.2.4.1.10 of 802.11-2012. Account for this in calculation of 
> header length.
> 
> Signed-off-by: Fred Chou <fred.chou.nd@xxxxxxxxx>
> ---
>  net/wireless/util.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/net/wireless/util.c b/net/wireless/util.c
> index 1d2fcfa..ce9617c 100644
> --- a/net/wireless/util.c
> +++ b/net/wireless/util.c
> @@ -297,6 +297,12 @@ unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
>  {
>  	unsigned int hdrlen = 24;
>  
> +	if (ieee80211_is_mgmt(fc)) {
> +		if (ieee80211_has_order(fc))
> +			hdrlen += IEEE80211_HT_CTL_LEN;
> +		goto out;
> +	}
> +
>  	if (ieee80211_is_data(fc)) {

I think you should insert this after data since data frames are more
common.

johannes

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