netdev - Re: [PATCH net 1/2] packet: do skb_probe_transport

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Date:	Sun, 08 Nov 2015 22:11:21 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	daniel@...earbox.net
Cc:	eric.dumazet@...il.com, edumazet@...gle.com, willemb@...gle.com,
	tklauser@...tanz.ch, netdev@...r.kernel.org, jasowang@...hat.com
Subject: Re: [PATCH net 1/2] packet: do skb_probe_transport_header when we
 actually have data

From: Daniel Borkmann <daniel@...earbox.net>
Date: Sun, 08 Nov 2015 01:33:56 +0100

> Hmm, yeah, on a (only quick) look, it seems this is mostly needed for
> the
> virtio_net related code in packet_snd() / packet_recvmsg(), not
> handled in
> RX/TX ring paths actually.
> 
> $ git grep -n gso_size net/packet/
> net/packet/af_packet.c:2748: if (vnet_hdr.gso_size == 0)
> net/packet/af_packet.c:2825:            skb_shinfo(skb)->gso_size =
> net/packet/af_packet.c:2826: __virtio16_to_cpu(vio_le(),
> vnet_hdr.gso_size);
> net/packet/af_packet.c:3219:                    vnet_hdr.gso_size =
> net/packet/af_packet.c:3220: __cpu_to_virtio16(vio_le(),
> sinfo->gso_size);
> 
> Need to take a closer look on Monday.

I think for complete safety, we need the transport header set for
all SKBs once they hit the device.

I know this is separate from the bugs you are trying to fix, but
let's take care of this in this series ok?
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