netdev - Re: [PATCH net] vxlan: fix missing options_len update on RX with collect metadata

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Date:	Wed, 2 Mar 2016 17:21:13 -0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Daniel Borkmann <daniel@...earbox.net>
Cc:	David Miller <davem@...emloft.net>, Thomas Graf <tgraf@...g.ch>,
	Pravin B Shelar <pshelar@...ira.com>, jesse@...nel.org,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net] vxlan: fix missing options_len update on RX with
 collect metadata

On Tue, Mar 1, 2016 at 5:32 PM, Daniel Borkmann <daniel@...earbox.net> wrote:
> When signalling to metadata consumers that the metadata_dst entry
> carries additional GBP extension data for vxlan (TUNNEL_VXLAN_OPT),
> the dst's vxlan_metadata information is populated, but options_len
> is left to zero. F.e. in ovs, ovs_flow_key_extract() checks for
> options_len before extracting the data through ip_tunnel_info_opts_get().
>
> Geneve uses ip_tunnel_info_opts_set() helper in receive path, which
> sets options_len internally, vxlan however uses ip_tunnel_info_opts(),
> so when filling vxlan_metadata, we do need to update options_len.
>
> Fixes: 4c22279848c5 ("ip-tunnel: Use API to access tunnel metadata options.")
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> ---
>  drivers/net/vxlan.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
> index b601139..1c32bd1 100644
> --- a/drivers/net/vxlan.c
> +++ b/drivers/net/vxlan.c
> @@ -1308,8 +1308,10 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
>                 gbp = (struct vxlanhdr_gbp *)vxh;
>                 md->gbp = ntohs(gbp->policy_id);
>
> -               if (tun_dst)
> +               if (tun_dst) {
>                         tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
> +                       tun_dst->u.tun_info.options_len = sizeof(*md);
> +               }
>

Why not set it in tun_rx_dst() where it is allocated?