netdev - Re: [PATCH RESEND] packet: Deliver VLAN TPID to userspace

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Date:	Fri, 25 Oct 2013 18:59:20 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	atzm@...atosphere.co.jp
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	bhutchings@...arflare.com
Subject: Re: [PATCH RESEND] packet: Deliver VLAN TPID to userspace

From: Atzm Watanabe <atzm@...atosphere.co.jp>
Date: Tue, 22 Oct 2013 17:39:40 +0900

>  struct tpacket_hdr_variant1 {
>  	__u32	tp_rxhash;
>  	__u32	tp_vlan_tci;
> +	__u32	tp_vlan_tpid;
>  };
>  

You cannot do this, the header length is not variable.

This patch has been submitted several times, each of which you
have been shown ways in which your changes break userspace in
one way or another.
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