netdev - Re: [PATCH net] bpf: make padding in bpf_tunnel

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Date:	Wed, 30 Mar 2016 00:10:43 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	daniel@...earbox.net
Cc:	alexei.starovoitov@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] bpf: make padding in bpf_tunnel_key explicit

From: Daniel Borkmann <daniel@...earbox.net>
Date: Wed, 30 Mar 2016 00:02:00 +0200

> Make the 2 byte padding in struct bpf_tunnel_key between tunnel_ttl
> and tunnel_label members explicit. No issue has been observed, and
> gcc/llvm does padding for the old struct already, where tunnel_label
> was not yet present, so the current code works, but since it's part
> of uapi, make sure we don't introduce holes in structs.
> 
> Therefore, add tunnel_ext that we can use generically in future
> (f.e. to flag OAM messages for backends, etc). Also add the offset
> to the compat tests to be sure should some compilers not padd the
> tail of the old version of bpf_tunnel_key.
> 
> Fixes: 4018ab1875e0 ("bpf: support flow label for bpf_skb_{set, get}_tunnel_key")
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>

Applied, thanks.