netdev - Re: [PATCHv2 net-next] openvswitch: fix vport packet length check.

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Date:   Wed, 7 Mar 2018 17:01:57 -0800
From:   Pravin Shelar <pshelar@....org>
To:     William Tu <u9012063@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jiri Benc <jbenc@...hat.com>
Subject: Re: [PATCHv2 net-next] openvswitch: fix vport packet length check.

On Wed, Mar 7, 2018 at 3:38 PM, William Tu <u9012063@...il.com> wrote:
> When sending a packet to a tunnel device, the dev's hard_header_len
> could be larger than the skb->len in function packet_length().
> In the case of ip6gretap/erspan, hard_header_len = LL_MAX_HEADER + t_hlen,
> which is around 180, and an ARP packet sent to this tunnel has
> skb->len = 42.  This causes the 'unsign int length' to become super
> large because it is negative value, causing the later ovs_vport_send
> to drop it due to over-mtu size.  The patch fixes it by setting it to 0.
>
> Signed-off-by: William Tu <u9012063@...il.com>
> ---
> v1->v2:
>   replace the return type from unsigned int to int
> ---
Acked-by: Pravin B Shelar <pshelar@....org>