ip6_gre: Do not allow segmentation offloads GRE_CSUM is enabled with FOU/GUE
This patch addresses the same issue we had for IPv4 where enabling GRE with
an inner checksum cannot be supported with FOU/GUE due to the fact that
they will jump past the GRE header at it is treated like a tunnel header.
Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 6fb1b89..af503f5 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -1355,11 +1355,15 @@
dev->hw_features |= GRE6_FEATURES;
if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
- /* TCP segmentation offload is not supported when we
- * generate output sequences.
+ /* TCP offload with GRE SEQ is not supported, nor
+ * can we support 2 levels of outer headers requiring
+ * an update.
*/
- dev->features |= NETIF_F_GSO_SOFTWARE;
- dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+ if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
+ (nt->encap.type == TUNNEL_ENCAP_NONE)) {
+ dev->features |= NETIF_F_GSO_SOFTWARE;
+ dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+ }
/* Can use a lockless transmit, unless we generate
* output sequences