Subject: Re: [net-next v2 3/3] cfg80211: add MPLS and 802.21 classification

From: Arend van Spriel <arend-dY08KVG/lbpWk0Htik3J/[email-masked]>
Date: Mon, 17 Feb 2014 18:30:51 +0100

On 02/17/14 17:56, 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<[email-masked]>
> Signed-off-by: Mathias Kretschmer<[email-masked]>
> ---
> Changes to first version:
>
>   * include linux/mpls.h, not the UAPI one
>   * change __constant_htons to htons
> ---
>   net/wireless/util.c |   24 ++++++++++++++++++++++++
>   1 file changed, 24 insertions(+)
>
> diff --git a/net/wireless/util.c b/net/wireless/util.c
> index d39c371..54956eb 100644
> --- a/net/wireless/util.c
> +++ b/net/wireless/util.c
> @@ -11,6 +11,7 @@
>   #include<net/ip.h>
>   #include<net/dsfield.h>
>   #include<linux/if_vlan.h>
> +#include<linux/mpls.h>
>   #include "core.h"
>   #include "rdev-ops.h"
>
> @@ -710,6 +711,29 @@ unsigned int cfg80211_classify8021d(struct sk_buff *skb,

So does the name still covers what it is doing now or should we just 
callit cfg80211_classify_skb()?

>   			return vlan_priority;
>   	}
>
> +	if (skb_headlen(skb)>= sizeof(struct ethhdr)) {
> +		struct ethhdr *eh = (struct ethhdr *)skb->data;
> +		struct mpls_label_stack mpls_tmp, *mpls;
> +
> +		switch (eh->h_proto) {

It seem eh->h_proto should be the same as skb->protocol, right? So why 
not add these case statements to the switch below?

Regards,
Arend

> +		case htons(ETH_P_MPLS_UC):
> +		case htons(ETH_P_MPLS_MC):
> +			/* MPLS */
> +			mpls = skb_header_pointer(skb, sizeof(*eh),
> +						  sizeof(*mpls),&mpls_tmp);
> +			if (!mpls)
> +				break;
> +
> +			return (ntohl(mpls->entry)&  MPLS_LS_TC_MASK)
> +				>>  MPLS_LS_TC_SHIFT;
> +		case htons(ETH_P_80221):
> +			/* 802.21 is always network control traffic */
> +			return 7;
> +		default:
> +			break;
> +		}
> +	}
> +
>   	switch (skb->protocol) {
>   	case htons(ETH_P_IP):
>   		dscp = ipv4_get_dsfield(ip_hdr(skb))&  0xfc;

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