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| author | Joe Stringer <joestringer@nicira.com> | 2014-11-14 01:38:12 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-11-14 23:12:48 +0100 |
| commit | 23e62de33d179e229e4c1dfd93f90a3c7355c519 (patch) | |
| tree | a08dd11592ac4910158cb478749b092cb81317b0 /drivers/net | |
| parent | Merge tag 'master-2014-11-11' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff) | |
| download | linux-23e62de33d179e229e4c1dfd93f90a3c7355c519.tar.xz linux-23e62de33d179e229e4c1dfd93f90a3c7355c519.zip | |
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>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/vxlan.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index fa9dc45b75a6..6b658638b456 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -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, |