datapath: Abstract tunneling implementation from GRE.

[sliver-openvswitch.git] / datapath / tunnel.h

diff --git a/datapath/tunnel.h b/datapath/tunnel.h
new file mode 100644 (file)
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--- /dev/null
+++ b/datapath/tunnel.h
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2010 Nicira Networks.
+ * Distributed under the terms of the GNU GPL version 2.
+ *
+ * Significant portions of this file may be copied from parts of the Linux
+ * kernel, by Linus Torvalds and others.
+ */
+
+#ifndef TUNNEL_H
+#define TUNNEL_H 1
+
+#include "openvswitch/tunnel.h"
+#include "table.h"
+#include "vport.h"
+
+/* The absolute minimum fragment size.  Note that there are many other
+ * definitions of the minimum MTU. */
+#define IP_MIN_MTU 68
+
+/*
+ * One of these goes in your struct tnl_ops and in tnl_find_port().
+ * These values are in the same namespace as other TNL_T_* values, so
+ * you have only the first 10 bits to define protocol identifiers.
+ */
+#define TNL_T_PROTO_GRE                0
+
+/* You only need these flags when you are calling tnl_find_port(). */
+#define TNL_T_KEY_EXACT                (1 << 10)
+#define TNL_T_KEY_MATCH                (1 << 11)
+#define TNL_T_KEY_EITHER       (TNL_T_KEY_EXACT | TNL_T_KEY_MATCH)
+
+struct tnl_mutable_config {
+       struct rcu_head rcu;
+
+       unsigned char eth_addr[ETH_ALEN];
+       unsigned int mtu;
+       struct tnl_port_config port_config;
+
+       /* Set of TNL_T_* flags that define the category for lookup. */
+       u32 tunnel_type;
+
+       int tunnel_hlen; /* Tunnel header length. */
+};
+
+struct tnl_ops {
+       /* Put your TNL_T_PROTO_* type in here. */
+       u32 tunnel_type;
+       u8 ipproto;
+
+       int (*hdr_len)(const struct tnl_port_config *);
+       void (*build_header)(struct sk_buff *, const struct vport *,
+                            const struct tnl_mutable_config *);
+};
+
+struct tnl_vport {
+       struct rcu_head rcu;
+       struct tbl_node tbl_node;
+
+       char name[IFNAMSIZ];
+       const struct tnl_ops *tnl_ops;
+
+       /* Protected by RCU. */
+       struct tnl_mutable_config *mutable;
+};
+
+int tnl_init(void);
+void tnl_exit(void);
+struct vport *tnl_create(const char *name, const void __user *config,
+                        const struct vport_ops *,
+                        const struct tnl_ops *);
+int tnl_modify(struct vport *, const void __user *config);
+int tnl_destroy(struct vport *);
+int tnl_set_mtu(struct vport *vport, int mtu);
+int tnl_set_addr(struct vport *vport, const unsigned char *addr);
+const char *tnl_get_name(const struct vport *vport);
+const unsigned char *tnl_get_addr(const struct vport *vport);
+int tnl_get_mtu(const struct vport *vport);
+int tnl_send(struct vport *vport, struct sk_buff *skb);
+void tnl_rcv(struct vport *vport, struct sk_buff *skb);
+
+struct vport *tnl_find_port(__be32 saddr, __be32 daddr, __be32 key,
+                           int tunnel_type,
+                           const struct tnl_mutable_config **mutable);
+bool tnl_frag_needed(struct vport *vport,
+                    const struct tnl_mutable_config *mutable,
+                    struct sk_buff *skb, unsigned int mtu, __be32 flow_key);
+
+static inline struct tnl_vport *tnl_vport_priv(const struct vport *vport)
+{
+       return vport_priv(vport);
+}
+
+#endif /* tunnel.h */