1 files changed, 132 insertions, 0 deletions
diff --git a/include/net/lwtunnel.h b/include/net/lwtunnel.h
new file mode 100644
index 0000000..df24b36
--- /dev/null
+++ b/include/net/lwtunnel.h
@@ -0,0 +1,132 @@
+#ifndef __NET_LWTUNNEL_H
+#define __NET_LWTUNNEL_H 1
+
+#include <linux/lwtunnel.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <net/route.h>
+
+#define LWTUNNEL_HASH_BITS   7
+#define LWTUNNEL_HASH_SIZE   (1 << LWTUNNEL_HASH_BITS)
+
+/* lw tunnel state flags */
+#define LWTUNNEL_STATE_OUTPUT_REDIRECT 0x1
+
+struct lwtunnel_state {
+	__u16		type;
+	__u16		flags;
+	atomic_t	refcnt;
+	int             len;
+	__u8            data[0];
+};
+
+struct lwtunnel_encap_ops {
+	int (*build_state)(struct net_device *dev, struct nlattr *encap,
+			   struct lwtunnel_state **ts);
+	int (*output)(struct sock *sk, struct sk_buff *skb);
+	int (*fill_encap)(struct sk_buff *skb,
+			  struct lwtunnel_state *lwtstate);
+	int (*get_encap_size)(struct lwtunnel_state *lwtstate);
+	int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b);
+};
+
+extern const struct lwtunnel_encap_ops __rcu *
+		lwtun_encaps[LWTUNNEL_ENCAP_MAX+1];
+
+#ifdef CONFIG_LWTUNNEL
+static inline void lwtunnel_state_get(struct lwtunnel_state *lws)
+{
+	atomic_inc(&lws->refcnt);
+}
+
+static inline void lwtunnel_state_put(struct lwtunnel_state *lws)
+{
+	if (!lws)
+		return;
+
+	if (atomic_dec_and_test(&lws->refcnt))
+		kfree(lws);
+}
+
+static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
+{
+	if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
+		return true;
+
+	return false;
+}
+
+int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
+			   unsigned int num);
+int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
+			   unsigned int num);
+int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
+			 struct nlattr *encap,
+			 struct lwtunnel_state **lws);
+int lwtunnel_fill_encap(struct sk_buff *skb,
+			struct lwtunnel_state *lwtstate);
+int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
+struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
+int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
+
+#else
+
+static inline void lwtunnel_state_get(struct lwtunnel_state *lws)
+{
+}
+
+static inline void lwtunnel_state_put(struct lwtunnel_state *lws)
+{
+}
+
+static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
+{
+	return false;
+}
+
+static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
+					 unsigned int num)
+{
+	return -EOPNOTSUPP;
+
+}
+
+static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
+					 unsigned int num)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
+				       struct nlattr *encap,
+				       struct lwtunnel_state **lws)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int lwtunnel_fill_encap(struct sk_buff *skb,
+				      struct lwtunnel_state *lwtstate)
+{
+	return 0;
+}
+
+static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
+{
+	return 0;
+}
+
+static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
+{
+	return NULL;
+}
+
+static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
+				     struct lwtunnel_state *b)
+{
+	return 0;
+}
+
+#endif
+
+#endif /* __NET_LWTUNNEL_H */