datapath-windows: Add GRE TEB support for windows datapath

This patch introduces the support for GRE TEB (trasparent ethernet bridging)
for the windows datapath.

The GRE support is based on http://tools.ietf.org/html/rfc2890, without
taking into account the GRE sequence, and it supports only the GRE protocol
type 6558 (trasparent ethernet bridging) like its linux counterpart.

Util.h: define the GRE pool tag
Vport.c/h: sort the includes alphabetically
           add the function OvsFindTunnelVportByPortType which searches the
           tunnelVportsArray for a given port type
Actions.c : sort the includes alphabetically
            call the GRE encapsulation / decapsulation functions when needed
Gre.c/h : add GRE type defines
          add initialization/cleanup functions
          add encapsulation / decapsulation functions with software offloads
          (hardware offloads will be added in a separate patch)
          support

Tested using: PSPING
              (https://technet.microsoft.com/en-us/sysinternals/psping.aspx)
              (ICMP, TCP, UDP) with various packet lengths
              IPERF3
              (https://iperf.fr/iperf-download.php)
              (TCP, UDP) with various options

Signed-off-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Acked-by: Sorin Vinturis <svinturis@cloudbasesolutions.com>
Signed-off-by: Justin Pettit <jpettit@ovn.org>

1 files changed, 100 insertions, 0 deletions

diff --git a/datapath-windows/ovsext/Gre.h b/datapath-windows/ovsext/Gre.h
new file mode 100644
index 000000000..d2472d91a
--- /dev/null
+++ b/datapath-windows/ovsext/Gre.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2015 Cloudbase Solutions Srl
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __GRE_H_
+#define __GRE_H_ 1
+
+#include "NetProto.h"
+#include "Flow.h"
+
+typedef struct _OVS_GRE_VPORT {
+    UINT64 ipId;
+    /*
+     * To be filled
+     */
+} OVS_GRE_VPORT, *POVS_GRE_VPORT;
+
+
+/* GRE RFC 2890 header based on http://tools.ietf.org/html/rfc2890
+ *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |C| |K|S| Reserved0       | Ver |         Protocol Type         |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |      Checksum (optional)      |       Reserved1 (Optional)    |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                         Key (optional)                        |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                 Sequence Number (Optional)                    |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+typedef struct GREHdr {
+    UINT16 flags;
+    UINT16 protocolType;
+} GREHdr, *PGREHdr;
+
+/* Transparent Ethernet Bridging */
+#define GRE_NET_TEB     0x5865
+/* GRE Flags*/
+#define GRE_CSUM    0x0080
+#define GRE_KEY     0x0020
+
+NTSTATUS OvsInitGreTunnel(POVS_VPORT_ENTRY vport);
+
+VOID OvsCleanupGreTunnel(POVS_VPORT_ENTRY vport);
+
+
+void OvsCleanupGreTunnel(POVS_VPORT_ENTRY vport);
+
+NDIS_STATUS OvsEncapGre(POVS_VPORT_ENTRY vport,
+                        PNET_BUFFER_LIST curNbl,
+                        OvsIPv4TunnelKey *tunKey,
+                        POVS_SWITCH_CONTEXT switchContext,
+                        POVS_PACKET_HDR_INFO layers,
+                        PNET_BUFFER_LIST *newNbl);
+
+NDIS_STATUS OvsDecapGre(POVS_SWITCH_CONTEXT switchContext,
+                        PNET_BUFFER_LIST curNbl,
+                        OvsIPv4TunnelKey *tunKey,
+                        PNET_BUFFER_LIST *newNbl);
+
+static __inline UINT16
+OvsTunnelFlagsToGreFlags(UINT16 tunnelflags)
+{
+    UINT16 flags = 0;
+
+    if (tunnelflags & OVS_TNL_F_CSUM)
+        flags |= GRE_CSUM;
+
+    if (tunnelflags & OVS_TNL_F_KEY)
+        flags |= GRE_KEY;
+
+    return flags;
+}
+
+static __inline UINT32
+GreTunHdrSize(UINT16 flags)
+{
+    UINT32 sum = sizeof(EthHdr) + sizeof(IPHdr) + sizeof(GREHdr);
+    sum += (flags & OVS_TNL_F_CSUM) ?
+           4 : 0;
+    sum += (flags & OVS_TNL_F_KEY) ?
+           4 : 0;
+
+    return sum;
+}
+
+#endif /*__GRE_H_ */