OS-4018 lxbrand support TCP SO_REUSEPORT
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Cody Mello <cody.mello@joyent.com>

@@ -19,10 +19,11 @@
  * CDDL HEADER END
  */
 
 /*
  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2015 Joyent, Inc.
  */
 
 /* This file contains all TCP kernel socket related functions. */
 
 #include <sys/types.h>

@@ -1019,10 +1020,20 @@
                 freeb(stropt_mp);
                 freeb(ordrel_mp);
                 return (ENOMEM);
         }
 
+        /*
+         * Do not allow fallback on connections making use of SO_REUSEPORT.
+         */
+        if (tcp->tcp_rg_bind != NULL) {
+                freeb(stropt_mp);
+                freeb(ordrel_mp);
+                squeue_synch_exit(connp);
+                return (EINVAL);
+        }
+
         /*
          * Both endpoints must be of the same type (either STREAMS or
          * non-STREAMS) for fusion to be enabled. So if we are fused,
          * we have to unfuse.
          */