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-rw-r--r--vnet/vnet/gre/packet.h54
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diff --git a/vnet/vnet/gre/packet.h b/vnet/vnet/gre/packet.h
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+#ifndef included_vnet_gre_packet_h
+#define included_vnet_gre_packet_h
+
+/*
+ * GRE packet format
+ *
+ * Copyright (c) 2012 Cisco and/or its affiliates.
+ * 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.
+ */
+
+#define foreach_gre_protocol \
+_ (0x0800, ip4) \
+_ (0x86DD, ip6) \
+_ (0x0806, arp) \
+_ (0x8847, mpls_unicast) \
+_ (0x894F, nsh)
+
+typedef enum {
+#define _(n,f) GRE_PROTOCOL_##f = n,
+ foreach_gre_protocol
+#undef _
+} gre_protocol_t;
+
+typedef struct {
+ /* flags and version */
+ u16 flags_and_version;
+ /* unimplemented at the moment */
+#define GRE_FLAGS_CHECKSUM (1 << 15)
+
+ /* deprecated, according to rfc2784 */
+#define GRE_FLAGS_ROUTING (1 << 14)
+#define GRE_FLAGS_KEY (1 << 13)
+#define GRE_FLAGS_SEQUENCE (1 << 12)
+#define GRE_FLAGS_STRICT_SOURCE_ROUTE (1 << 11)
+
+ /* version 1 is PPTP which we don't support */
+#define GRE_SUPPORTED_VERSION 0
+#define GRE_VERSION_MASK 0x7
+
+ /* 0x800 for ip4, etc. */
+ u16 protocol;
+} gre_header_t;
+
+#endif /* included_vnet_gre_packet_h */