Respond to echo requests in OpenFlow implementations.

[sliver-openvswitch.git] / datapath / datapath.c

diff --git a/datapath/datapath.c b/datapath/datapath.c
index 8403644..55c2c61 100644 (file)
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -813,6 +813,22 @@ dp_send_error_msg(struct datapath *dp, const struct sender *sender,
        return send_openflow_skb(skb, sender);
 }
 
+int
+dp_send_echo_reply(struct datapath *dp, const struct sender *sender,
+                  const struct ofp_header *rq)
+{
+       struct sk_buff *skb;
+       struct ofp_header *reply;
+
+       reply = alloc_openflow_skb(dp, ntohs(rq->length), OFPT_ECHO_REPLY,
+                                  sender, &skb);
+       if (!reply)
+               return -ENOMEM;
+
+       memcpy(reply + 1, rq + 1, ntohs(rq->length) - sizeof *rq);
+       return send_openflow_skb(skb, sender);
+}
+
 /* Generic Netlink interface.
  *
  * See netlink(7) for an introduction to netlink.  See