vxlan: fix missing options_len update on RX with collect metadata

[ Upstream commit 4024fcf70556311521e7b6cf79fa50e16f31013a ]

When signalling to metadata consumers that the metadata_dst entry
carries additional GBP extension data for vxlan (TUNNEL_VXLAN_OPT),
the dst's vxlan_metadata information is populated, but options_len
is left to zero. F.e. in ovs, ovs_flow_key_extract() checks for
options_len before extracting the data through ip_tunnel_info_opts_get().

Geneve uses ip_tunnel_info_opts_set() helper in receive path, which
sets options_len internally, vxlan however uses ip_tunnel_info_opts(),
so when filling vxlan_metadata, we do need to update options_len.

Fixes: 4c22279848c5 ("ip-tunnel: Use API to access tunnel metadata options.")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index e0fcda4ddd55a401b5aedc9e4d79ace206758afb..3c0df70e2f53aa0020b79e93f3adf92b43fee0b3 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1306,8 +1306,10 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
                gbp = (struct vxlanhdr_gbp *)vxh;
                md->gbp = ntohs(gbp->policy_id);
 
-               if (tun_dst)
+               if (tun_dst) {
                        tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
+                       tun_dst->u.tun_info.options_len = sizeof(*md);
+               }
 
                if (gbp->dont_learn)
                        md->gbp |= VXLAN_GBP_DONT_LEARN;