netdev - Re: [net-next v3 3/3] cfg80211: add MPLS and 802.21 classification

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Date:	Mon, 24 Feb 2014 22:57:24 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Simon Wunderlich <sw@...onwunderlich.de>, netdev@...r.kernel.org
CC:	davem@...emloft.net, linux-wireless@...r.kernel.org,
	mathias.kretschmer@...us.fraunhofer.de
Subject: Re: [net-next v3 3/3] cfg80211: add MPLS and 802.21 classification

Hello.

On 02/24/2014 03:28 PM, Simon Wunderlich wrote:

> MPLS labels may contain traffic control information, which should be
> evaluated and used by the wireless subsystem if present.

> Also check for IEEE 802.21 which is always network control traffic.

> Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
> Signed-off-by: Mathias Kretschmer <mathias.kretschmer@...us.fraunhofer.de>
> ---
> Changes to second version:

>   * rely on skb->protocol instead of checking ethertype

> Changes to first version:
>
>   * include linux/mpls.h, not the UAPI one
>   * change __constant_htons to htons
> ---
>   net/wireless/util.c |   16 ++++++++++++++++
>   1 file changed, 16 insertions(+)

> diff --git a/net/wireless/util.c b/net/wireless/util.c
> index d39c371..6799d5a 100644
> --- a/net/wireless/util.c
> +++ b/net/wireless/util.c
[...]
> @@ -717,6 +718,21 @@ unsigned int cfg80211_classify8021d(struct sk_buff *skb,
>   	case htons(ETH_P_IPV6):
>   		dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
>   		break;
> +	case htons(ETH_P_MPLS_UC):
> +	case htons(ETH_P_MPLS_MC): {
> +		struct mpls_label_stack mpls_tmp, *mpls;
> +
> +		mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
> +					  sizeof(*mpls), &mpls_tmp);
> +		if (!mpls)
> +			return 0;
> +
> +		return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
> +			>> MPLS_LS_TC_SHIFT;
> +		}

    Brace is over-indented here, it can't be at the same level as the 
statements it embraces.

WBR, Sergei

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