Hi,
I’m experimenting with attaching metadata_dst to skb in the gtp recv path. The
goal is to let ovs to meter the gtp traffic. However, I encountered the
following error in ovs_flow_cmd_new
:
[ 411.462443] openvswitch: netlink: Unexpected mask (mask=110058,
allowed=41980cc)
Seems the OVS_KEY_ATTR_ETHERNET bit is not allowed.
Why does the error happen?
My setup is as following,
libgtpnl:
modprobe gtp
./gtp-link add gtp0
./gtp-tunnel add gtp0 v1 999 123 1.1.1.1 192.168.60.143
ovs dev branch:
ovs-vsctl add-br br0
ifconfig br0 1.1.1.122/24 up
ovs-vsctl add-port br0 gtp0
Linux 4.9 drivers/net/gtp.c:
@@ -270,12 +274,33 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp,
struct sk_buff *skb,
goto out_rcu;
}
rcu_read_unlock();
+*/
+ if (ip_tunnel_collect_metadata() || true) { // always collect metadata
+ __be16 flags;
+ struct metadata_dst *tun_dst;
+
+ flags = TUNNEL_KEY;
+
+ tun_dst = udp_tun_rx_dst(skb, gtp->sock1u->sk->sk_family,
flags,
+ ntohl(gtp1->tid), 0);
+ if (!tun_dst)
+ goto drop;
+
+ netdev_info(gtp->dev, "Attaching tun_dst to skb...");
+ skb_dst_set(skb, (struct dst_entry *)tun_dst);
+ } else {
+ netdev_err(gtp->dev, "Not collecting metadata");
+ }
Thanks
-Jiannan
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