netdev - Re: [PATCH v6 net-next 09/14] ip6_tun: Add infrastructure for doing encapsulation

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Date:	Mon, 16 May 2016 15:25:06 -0700
From:	Alexander Duyck <alexander.duyck@...il.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>, Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v6 net-next 09/14] ip6_tun: Add infrastructure for doing encapsulation

On Mon, May 16, 2016 at 2:33 PM, Tom Herbert <tom@...bertland.com> wrote:
> Add encap_hlen and ip_tunnel_encap structure to ip6_tnl. Add functions
> for getting encap hlen, setting up encap on a tunnel, performing
> encapsulation operation.
>
> Signed-off-by: Tom Herbert <tom@...bertland.com>
> ---
>  include/net/ip6_tunnel.h  | 58 ++++++++++++++++++++++++++++++++
>  net/ipv4/ip_tunnel_core.c |  5 +++
>  net/ipv6/ip6_tunnel.c     | 85 ++++++++++++++++++++++++++++++++++++++++++-----
>  3 files changed, 139 insertions(+), 9 deletions(-)
>

So it looks like you completely dropped the two spots that were
updating mtu and max_headroom with the t->hlen.  I thought you needed
to at least have a check that used t->encap_hlen here in order to
avoid overflowing the buffer or exceeding skb_headroom, or am I
missing something?

- Alex