datapath-windows: Add file NetlinkError.h.

Contains error codes for netlink transactional errors.
These errors are passed to the "error" field (INT) of the NL_MSG_ERR struct.
The userspace requires them to be negative values: the nl_msg_nlmsgerr userspace
function transforms them from negative to positive values.

These error codes correspond to the userspace error codes defined in:
"C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\include\errno.h"

Signed-off-by: Samuel Ghinet <sghinet@cloudbasesolutions.com>
Acked-by: Eitan Eliahu <eliahue@vmware.com>
Acked-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/datapath-windows/ovsext/Datapath.h b/datapath-windows/ovsext/Datapath.h
index 4e6c9b1ae..73e6654ee 100644
--- a/datapath-windows/ovsext/Datapath.h
+++ b/datapath-windows/ovsext/Datapath.h
@@ -29,7 +29,7 @@
 #define __DATAPATH_H_ 1
 
 /*
- * Structure of any message passed between userspace and kernel.
+ * Structure of a general message passed between userspace and kernel.
  */
 typedef struct _OVS_MESSAGE {
     NL_MSG_HDR nlMsg;
@@ -38,6 +38,14 @@ typedef struct _OVS_MESSAGE {
     /* Variable length nl_attrs follow. */
 } OVS_MESSAGE, *POVS_MESSAGE;
 
+/*
+ * Structure of an error message sent as a reply from kernel.
+ */
+typedef struct _OVS_MESSAGE_ERROR {
+    NL_MSG_HDR nlMsg;
+    NL_MSG_ERR errorMsg;
+} OVS_MESSAGE_ERROR, *POVS_MESSAGE_ERROR;
+
 typedef struct _OVS_DEVICE_EXTENSION {
     INT numberOpenInstance;
     INT pidCount;