Commit cfdf1e1b authored by Jesse Gross's avatar Jesse Gross Committed by David S. Miller
Browse files

udptunnel: Add SKB_GSO_UDP_TUNNEL during gro_complete. 



When doing GRO processing for UDP tunnels, we never add
SKB_GSO_UDP_TUNNEL to gso_type - only the type of the inner protocol
is added (such as SKB_GSO_TCPV4). The result is that if the packet is
later resegmented we will do GSO but not treat it as a tunnel. This
results in UDP fragmentation of the outer header instead of (i.e.) TCP
segmentation of the inner header as was originally on the wire.

Signed-off-by: default avatarJesse Gross <jesse@nicira.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 10b450cb

drivers/net/vxlan.c

+2 −0
Original line number Diff line number Diff line
@@ -621,6 +621,8 @@ static int vxlan_gro_complete(struct sk_buff *skb, int nhoff) 
	int vxlan_len  = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);

	int err = -ENOSYS;



	udp_tunnel_gro_complete(skb, nhoff);



	eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));

	type = eh->h_proto;

include/net/udp_tunnel.h

+9 −0
Original line number Diff line number Diff line
@@ -100,6 +100,15 @@ static inline struct sk_buff *udp_tunnel_handle_offloads(struct sk_buff *skb, 
	return iptunnel_handle_offloads(skb, udp_csum, type);

}



static inline void udp_tunnel_gro_complete(struct sk_buff *skb, int nhoff)

{

	struct udphdr *uh;



	uh = (struct udphdr *)(skb->data + nhoff - sizeof(struct udphdr));

	skb_shinfo(skb)->gso_type |= uh->check ?

				SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;

}



static inline void udp_tunnel_encap_enable(struct socket *sock)

{

#if IS_ENABLED(CONFIG_IPV6)

net/ipv4/fou.c

+2 −0
Original line number Diff line number Diff line
@@ -133,6 +133,8 @@ static int fou_gro_complete(struct sk_buff *skb, int nhoff) 
	int err = -ENOSYS;

	const struct net_offload **offloads;



	udp_tunnel_gro_complete(skb, nhoff);



	rcu_read_lock();

	offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;

	ops = rcu_dereference(offloads[proto]);

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