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gre: set inner_protocol on xmit

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Ensure that the inner_protocol is set on transmit so that GSO segmentation,
which relies on that field, works correctly.

This is achieved by setting the inner_protocol in gre_build_header rather
than each caller of that function. It ensures that the inner_protocol is
set when gre_fb_xmit() is used to transmit GRE which was not previously the
case.

I have observed this is not the case when OvS transmits GRE using
lwtunnel metadata (which it always does).

Fixes: 3872035241 ("gre: Use inner_proto to obtain inner header protocol")
Cc: Pravin Shelar <[email protected]>
Acked-by: Alexander Duyck <[email protected]>
Signed-off-by: Simon Horman <[email protected]>
Acked-by: Pravin B Shelar <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Simon Horman 2016-08-15 13:06:24 +02:00 • committed by David S. Miller
commit 3d7b332092
3 changed files with 1 additions and 3 deletions
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2
net/ipv6/ip6_gre.c
View file

@ -519,8 +519,6 @@ static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
skb_set_inner_protocol(skb, protocol);
return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
NEXTHDR_GRE);
}