linux-kernel - Re: [PATCH -next] mac80211: Use #define IEEE80211_CCMP_PN

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Date:	Mon, 30 Mar 2015 22:01:58 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Joe Perches <joe@...ches.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] mac80211: Use #define IEEE80211_CCMP_PN_LEN and
 bool

On Mon, 2015-03-30 at 09:37 -0700, Joe Perches wrote:

> @@ -89,11 +90,11 @@ struct ieee80211_fragment_entry {
>  	unsigned int last_frag;
>  	unsigned int extra_len;
>  	struct sk_buff_head skb_list;
> -	int ccmp; /* Whether fragments were encrypted with CCMP */
> -	u8 last_pn[6]; /* PN of the last fragment if CCMP was used */
> +	/* for CCMP fragments */
> +	bool ccmp;				/* encrypted with CCMP */
> +	u8 last_pn[IEEE80211_CCMP_PN_LEN];	/* PN of the last fragment */

I took your patch as an opportunity to check into this, and it turns out
all of this logic is also going to be needed for GCMP. As a result, I'm
not going to take this patch but instead we'll fix it up for GCMP (where
using CCMP_PN_LEN would not be appropriate anyway - perhaps we need a
union or just keep '8' which is the right size for both anyway, or we'll
go to a u64 value or something)

johannes

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