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ip6_tunnel: fix GRE6 segmentation

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Commit 6c11fbf97e ("ip6_tunnel: add MPLS transmit support")
moved assiging inner_ipproto down from ipxip6_tnl_xmit() to
its callee ip6_tnl_xmit(). The latter is also used by GRE.

Since commit 3872035241 ("gre: Use inner_proto to obtain inner
header protocol") GRE had been depending on skb->inner_protocol
during segmentation. It sets it in gre_build_header() and reads
it in gre_gso_segment(). Changes to ip6_tnl_xmit() overwrite
the protocol, resulting in GSO skbs getting dropped.

Note that inner_protocol is a union with inner_ipproto,
GRE uses the former while the change switched it to the latter
(always setting it to just IPPROTO_GRE).

Restore the original location of skb_set_inner_ipproto(),
it is unclear why it was moved in the first place.

Fixes: 6c11fbf97e ("ip6_tunnel: add MPLS transmit support")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Tested-by: Vadim Fedorenko <vfedorenko@novek.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2021-06-21 18:52:54 -07:00 committed by David S. Miller
parent e596212e0f
commit a6e3f2985a
1 changed files with 2 additions and 2 deletions
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4
net/ipv6/ip6_tunnel.c
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@ -1239,8 +1239,6 @@ route_lookup:
if (max_headroom > dev->needed_headroom)
dev->needed_headroom = max_headroom;
skb_set_inner_ipproto(skb, proto);
err = ip6_tnl_encap(skb, t, &proto, fl6);
if (err)
return err;
@ -1377,6 +1375,8 @@ ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
return -1;
skb_set_inner_ipproto(skb, protocol);
err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
protocol);
if (err != 0) {