1 files changed, 122 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h
new file mode 100644
index 000000000000..b22b22082733
--- /dev/null
+++ b/include/net/netfilter/nf_flow_table.h
@@ -0,0 +1,122 @@
+#ifndef _NF_FLOW_TABLE_H
+#define _NF_FLOW_TABLE_H
+
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/rhashtable.h>
+#include <linux/rcupdate.h>
+#include <net/dst.h>
+
+struct nf_flowtable;
+
+struct nf_flowtable_type {
+	struct list_head		list;
+	int				family;
+	void				(*gc)(struct work_struct *work);
+	const struct rhashtable_params	*params;
+	nf_hookfn			*hook;
+	struct module			*owner;
+};
+
+struct nf_flowtable {
+	struct rhashtable		rhashtable;
+	const struct nf_flowtable_type	*type;
+	struct delayed_work		gc_work;
+};
+
+enum flow_offload_tuple_dir {
+	FLOW_OFFLOAD_DIR_ORIGINAL,
+	FLOW_OFFLOAD_DIR_REPLY,
+	__FLOW_OFFLOAD_DIR_MAX		= FLOW_OFFLOAD_DIR_REPLY,
+};
+#define FLOW_OFFLOAD_DIR_MAX	(__FLOW_OFFLOAD_DIR_MAX + 1)
+
+struct flow_offload_tuple {
+	union {
+		struct in_addr		src_v4;
+		struct in6_addr		src_v6;
+	};
+	union {
+		struct in_addr		dst_v4;
+		struct in6_addr		dst_v6;
+	};
+	struct {
+		__be16			src_port;
+		__be16			dst_port;
+	};
+
+	int				iifidx;
+
+	u8				l3proto;
+	u8				l4proto;
+	u8				dir;
+
+	int				oifidx;
+
+	struct dst_entry		*dst_cache;
+};
+
+struct flow_offload_tuple_rhash {
+	struct rhash_head		node;
+	struct flow_offload_tuple	tuple;
+};
+
+#define FLOW_OFFLOAD_SNAT	0x1
+#define FLOW_OFFLOAD_DNAT	0x2
+#define FLOW_OFFLOAD_DYING	0x4
+
+struct flow_offload {
+	struct flow_offload_tuple_rhash		tuplehash[FLOW_OFFLOAD_DIR_MAX];
+	u32					flags;
+	union {
+		/* Your private driver data here. */
+		u32		timeout;
+	};
+};
+
+#define NF_FLOW_TIMEOUT (30 * HZ)
+
+struct nf_flow_route {
+	struct {
+		struct dst_entry	*dst;
+		int			ifindex;
+	} tuple[FLOW_OFFLOAD_DIR_MAX];
+};
+
+struct flow_offload *flow_offload_alloc(struct nf_conn *ct,
+					struct nf_flow_route *route);
+void flow_offload_free(struct flow_offload *flow);
+
+int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow);
+void flow_offload_del(struct nf_flowtable *flow_table, struct flow_offload *flow);
+struct flow_offload_tuple_rhash *flow_offload_lookup(struct nf_flowtable *flow_table,
+						     struct flow_offload_tuple *tuple);
+int nf_flow_table_iterate(struct nf_flowtable *flow_table,
+			  void (*iter)(struct flow_offload *flow, void *data),
+			  void *data);
+void nf_flow_offload_work_gc(struct work_struct *work);
+extern const struct rhashtable_params nf_flow_offload_rhash_params;
+
+void flow_offload_dead(struct flow_offload *flow);
+
+int nf_flow_snat_port(const struct flow_offload *flow,
+		      struct sk_buff *skb, unsigned int thoff,
+		      u8 protocol, enum flow_offload_tuple_dir dir);
+int nf_flow_dnat_port(const struct flow_offload *flow,
+		      struct sk_buff *skb, unsigned int thoff,
+		      u8 protocol, enum flow_offload_tuple_dir dir);
+
+struct flow_ports {
+	__be16 source, dest;
+};
+
+unsigned int nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
+				     const struct nf_hook_state *state);
+unsigned int nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
+				       const struct nf_hook_state *state);
+
+#define MODULE_ALIAS_NF_FLOWTABLE(family)	\
+	MODULE_ALIAS("nf-flowtable-" __stringify(family))
+
+#endif /* _FLOW_OFFLOAD_H */