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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: Jesse Gross <jesse@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesse Gross 2014-11-10 11:45:13 -08:00 committed by David S. Miller
parent 10b450cbbc
commit cfdf1e1ba5
3 changed files with 13 additions and 0 deletions
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2
drivers/net/vxlan.c
View File

@ -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;

9
include/net/udp_tunnel.h
View File

@ -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)

2
net/ipv4/fou.c
View File

@ -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]);