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net: Add vxlan_gso_check() helper 

Most NICs that report NETIF_F_GSO_UDP_TUNNEL support VXLAN, and not
other UDP-based encapsulation protocols where the format and size of the
header differs. This patch implements a generic ndo_gso_check() for
VXLAN which will only advertise GSO support when the skb looks like it
contains VXLAN (or no UDP tunnelling at all).

Implementation shamelessly stolen from Tom Herbert:
http://thread.gmane.org/gmane.linux.network/332428/focus=333111

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joe Stringer 2014-11-13 16:38:12 -08:00 committed by David S. Miller
parent 8a5809e0dd
commit 23e62de33d
2 changed files with 15 additions and 0 deletions
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13
drivers/net/vxlan.c
View File

@ -1571,6 +1571,19 @@ static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
return false;
}
bool vxlan_gso_check(struct sk_buff *skb)
{
if ((skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL) &&
(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))))
return false;
return true;
}
EXPORT_SYMBOL_GPL(vxlan_gso_check);
#if IS_ENABLED(CONFIG_IPV6)
static int vxlan6_xmit_skb(struct vxlan_sock *vs,
struct dst_entry *dst, struct sk_buff *skb,

2
include/net/vxlan.h
View File

@ -45,6 +45,8 @@ int vxlan_xmit_skb(struct vxlan_sock *vs,
__be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
__be16 src_port, __be16 dst_port, __be32 vni, bool xnet);
bool vxlan_gso_check(struct sk_buff *skb);
/* IP header + UDP + VXLAN + Ethernet header */
#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
/* IPv6 header + UDP + VXLAN + Ethernet header */