On Tue, 2013-04-16 at 17:32 +0200, Florian Westphal wrote:
> Once we allow userspace to receive gso/gro packets, userspace
> needs to be able to determine when checksums appear to be
> broken, but are not.
>
> NFQA_SKB_CSUMNOTREADY means 'checksums will be fixed in kernel
> later, pretend they are ok'.
>
> NFQA_SKB_GSO could be used for statistics, or to determine when
> packet size exceeds mtu.
>
> Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
> Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
> ---
>
> +static int nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet)
> +{
> + __u32 flags = 0;
> +
> + if (skb_is_gso(packet))
> + flags = NFQA_SKB_GSO;
> + if (packet->ip_summed == CHECKSUM_PARTIAL)
> + flags |= NFQA_SKB_CSUMNOTREADY;
> +
> + return nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags));
Maybe you could avoid sending NFQA_SKB_INFO if flags == 0 ?
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