Mask the upper bits of dscp instead of failing if the user

supplied a too big value

src/fd_utils.c

@@ -89,14 +89,8 @@ int uc_set_ip_dscp(int fd, unsigned int dscp)
     int val;
 
     //only 6 bits for dscp
-    if (dscp > 63) {
-        errno = EINVAL;
-        return -1;
-    }
-
-    val = dscp << 2;
+    val = (dscp & 0x3f) << 2;
 
     return setsockopt(fd, IPPROTO_IP, IP_TOS, &val, sizeof val);
 }
 
-