Commit 096de2f8 authored by Sabrina Dubroca's avatar Sabrina Dubroca Committed by David S. Miller

benet: stricter vxlan offloading check in be_features_check

When VXLAN offloading is enabled, be_features_check() tries to check if
an encapsulated packet is indeed a VXLAN packet. The check is not strict
enough, and considers any UDP-encapsulated ethernet frame with a 8-byte
tunnel header as being VXLAN. Unfortunately, both GENEVE and VXLAN-GPE
have a 8-byte header, so they get through this check.

Force the UDP destination port to be the one that has been offloaded to
hardware.

Without this, GENEVE-encapsulated packets can end up having an incorrect
checksum when both a GENEVE and a VXLAN (offloaded) tunnel are
configured.

This is similar to commit a547224d ("mlx4e: Do not attempt to
offload VXLAN ports that are unrecognized").
Signed-off-by: default avatarSabrina Dubroca <sd@queasysnail.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5350d54f
......@@ -5155,7 +5155,9 @@ static netdev_features_t be_features_check(struct sk_buff *skb,
skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
skb->inner_protocol != htons(ETH_P_TEB) ||
skb_inner_mac_header(skb) - skb_transport_header(skb) !=
sizeof(struct udphdr) + sizeof(struct vxlanhdr))
sizeof(struct udphdr) + sizeof(struct vxlanhdr) ||
!adapter->vxlan_port ||
udp_hdr(skb)->dest != adapter->vxlan_port)
return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
return features;
......
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