datapath: supply a dummy err_handler of gre_cisco_protocol to prevent kernel crash

[cascardo/ovs.git] / datapath / vport-gre.c

diff --git a/datapath/vport-gre.c b/datapath/vport-gre.c
index 8737b63..93869ff 100644 (file)
--- a/datapath/vport-gre.c
+++ b/datapath/vport-gre.c
@@ -116,6 +116,25 @@ static int gre_rcv(struct sk_buff *skb,
        return PACKET_RCVD;
 }
 
+/* Called with rcu_read_lock and BH disabled. */
+static int gre_err(struct sk_buff *skb, u32 info,
+                  const struct tnl_ptk_info *tpi)
+{
+       struct ovs_net *ovs_net;
+       struct vport *vport;
+
+       ovs_net = net_generic(dev_net(skb->dev), ovs_net_id);
+       if ((tpi->flags & TUNNEL_KEY) && (tpi->flags & TUNNEL_SEQ))
+               vport = rcu_dereference(ovs_net->vport_net.gre64_vport);
+       else
+               vport = rcu_dereference(ovs_net->vport_net.gre_vport);
+
+       if (unlikely(!vport))
+               return PACKET_REJECT;
+       else
+               return PACKET_RCVD;
+}
+
 static int __send(struct vport *vport, struct sk_buff *skb,
                  int tunnel_hlen,
                  __be32 seq, __be16 gre64_flag)
@@ -187,6 +206,7 @@ error:
 
 static struct gre_cisco_protocol gre_protocol = {
        .handler        = gre_rcv,
+       .err_handler    = gre_err,
        .priority       = 1,
 };