include/net/netfilter/nf_flow_table.h - third_party/kernel - Git at Google

 #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-types.h>
 #include <linux/rcupdate.h>
 #include <linux/netfilter.h>
 #include <linux/netfilter/nf_conntrack_tuple_common.h>
 #include <net/flow_offload.h>
 #include <net/dst.h>
 #include <linux/if_pppox.h>
 #include <linux/ppp_defs.h>

 struct nf_flowtable;
 struct nf_flow_rule;
 struct flow_offload;
 enum flow_offload_tuple_dir;

 struct nf_flow_key {
 	struct flow_dissector_key_meta			meta;
 	struct flow_dissector_key_control		control;
 	struct flow_dissector_key_control		enc_control;
 	struct flow_dissector_key_basic			basic;
 	struct flow_dissector_key_vlan			vlan;
 	struct flow_dissector_key_vlan			cvlan;
 	union {
 		struct flow_dissector_key_ipv4_addrs	ipv4;
 		struct flow_dissector_key_ipv6_addrs	ipv6;
 	};
 	struct flow_dissector_key_keyid			enc_key_id;
 	union {
 		struct flow_dissector_key_ipv4_addrs	enc_ipv4;
 		struct flow_dissector_key_ipv6_addrs	enc_ipv6;
 	};
 	struct flow_dissector_key_tcp			tcp;
 	struct flow_dissector_key_ports			tp;
 } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */

 struct nf_flow_match {
 	struct flow_dissector	dissector;
 	struct nf_flow_key	key;
 	struct nf_flow_key	mask;
 };

 struct nf_flow_rule {
 	struct nf_flow_match	match;
 	struct flow_rule	*rule;
 };

 struct nf_flowtable_type {
 	struct list_head		list;
 	int				family;
 	int				(*init)(struct nf_flowtable *ft);
 	int				(*setup)(struct nf_flowtable *ft,
 						 struct net_device *dev,
 						 enum flow_block_command cmd);
 	int				(*action)(struct net *net,
 						  const struct flow_offload *flow,
 						  enum flow_offload_tuple_dir dir,
 						  struct nf_flow_rule *flow_rule);
 	void				(*free)(struct nf_flowtable *ft);
 	nf_hookfn			*hook;
 	struct module			*owner;
 };

 enum nf_flowtable_flags {
 	NF_FLOWTABLE_HW_OFFLOAD		= 0x1,	/* NFT_FLOWTABLE_HW_OFFLOAD */
 	NF_FLOWTABLE_COUNTER		= 0x2,	/* NFT_FLOWTABLE_COUNTER */
 };

 struct nf_flowtable {
 	struct list_head		list;
 	struct rhashtable		rhashtable;
 	int				priority;
 	const struct nf_flowtable_type	*type;
 	struct delayed_work		gc_work;
 	unsigned int			flags;
 	struct flow_block		flow_block;
 	struct rw_semaphore		flow_block_lock; /* Guards flow_block */
 	possible_net_t			net;
 };

 static inline bool nf_flowtable_hw_offload(struct nf_flowtable *flowtable)
 {
 	return flowtable->flags & NF_FLOWTABLE_HW_OFFLOAD;
 }

 enum flow_offload_tuple_dir {
 	FLOW_OFFLOAD_DIR_ORIGINAL = IP_CT_DIR_ORIGINAL,
 	FLOW_OFFLOAD_DIR_REPLY = IP_CT_DIR_REPLY,
 };
 #define FLOW_OFFLOAD_DIR_MAX	IP_CT_DIR_MAX

 enum flow_offload_xmit_type {
 	FLOW_OFFLOAD_XMIT_UNSPEC	= 0,
 	FLOW_OFFLOAD_XMIT_NEIGH,
 	FLOW_OFFLOAD_XMIT_XFRM,
 	FLOW_OFFLOAD_XMIT_DIRECT,
 };

 #define NF_FLOW_TABLE_ENCAP_MAX		2

 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;
 	struct {
 		u16			id;
 		__be16			proto;
 	} encap[NF_FLOW_TABLE_ENCAP_MAX];

 	/* All members above are keys for lookups, see flow_offload_hash(). */
 	struct { }			__hash;

 	u8				dir:2,
 					xmit_type:2,
 					encap_num:2,
 					in_vlan_ingress:2;
 	u16				mtu;
 	union {
 		struct {
 			struct dst_entry *dst_cache;
 			u32		dst_cookie;
 		};
 		struct {
 			u32		ifidx;
 			u32		hw_ifidx;
 			u8		h_source[ETH_ALEN];
 			u8		h_dest[ETH_ALEN];
 		} out;
 	};
 };

 struct flow_offload_tuple_rhash {
 	struct rhash_head		node;
 	struct flow_offload_tuple	tuple;
 };

 enum nf_flow_flags {
 	NF_FLOW_SNAT,
 	NF_FLOW_DNAT,
 	NF_FLOW_TEARDOWN,
 	NF_FLOW_HW,
 	NF_FLOW_HW_DYING,
 	NF_FLOW_HW_DEAD,
 	NF_FLOW_HW_PENDING,
 };

 enum flow_offload_type {
 	NF_FLOW_OFFLOAD_UNSPEC	= 0,
 	NF_FLOW_OFFLOAD_ROUTE,
 };

 struct flow_offload {
 	struct flow_offload_tuple_rhash		tuplehash[FLOW_OFFLOAD_DIR_MAX];
 	struct nf_conn				*ct;
 	unsigned long				flags;
 	u16					type;
 	u32					timeout;
 	struct rcu_head				rcu_head;
 };

 #define NF_FLOW_TIMEOUT (30 * HZ)
 #define nf_flowtable_time_stamp	(u32)jiffies

 unsigned long flow_offload_get_timeout(struct flow_offload *flow);

 static inline __s32 nf_flow_timeout_delta(unsigned int timeout)
 {
 	return (__s32)(timeout - nf_flowtable_time_stamp);
 }

 struct nf_flow_route {
 	struct {
 		struct dst_entry		*dst;
 		struct {
 			u32			ifindex;
 			struct {
 				u16		id;
 				__be16		proto;
 			} encap[NF_FLOW_TABLE_ENCAP_MAX];
 			u8			num_encaps:2,
 						ingress_vlans:2;
 		} in;
 		struct {
 			u32			ifindex;
 			u32			hw_ifindex;
 			u8			h_source[ETH_ALEN];
 			u8			h_dest[ETH_ALEN];
 		} out;
 		enum flow_offload_xmit_type	xmit_type;
 	} tuple[FLOW_OFFLOAD_DIR_MAX];
 };

 struct flow_offload *flow_offload_alloc(struct nf_conn *ct);
 void flow_offload_free(struct flow_offload *flow);

 static inline int
 nf_flow_table_offload_add_cb(struct nf_flowtable *flow_table,
 			     flow_setup_cb_t *cb, void *cb_priv)
 {
 	struct flow_block *block = &flow_table->flow_block;
 	struct flow_block_cb *block_cb;
 	int err = 0;

 	down_write(&flow_table->flow_block_lock);
 	block_cb = flow_block_cb_lookup(block, cb, cb_priv);
 	if (block_cb) {
 		err = -EEXIST;
 		goto unlock;
 	}

 	block_cb = flow_block_cb_alloc(cb, cb_priv, cb_priv, NULL);
 	if (IS_ERR(block_cb)) {
 		err = PTR_ERR(block_cb);
 		goto unlock;
 	}

 	list_add_tail(&block_cb->list, &block->cb_list);

 unlock:
 	up_write(&flow_table->flow_block_lock);
 	return err;
 }

 static inline void
 nf_flow_table_offload_del_cb(struct nf_flowtable *flow_table,
 			     flow_setup_cb_t *cb, void *cb_priv)
 {
 	struct flow_block *block = &flow_table->flow_block;
 	struct flow_block_cb *block_cb;

 	down_write(&flow_table->flow_block_lock);
 	block_cb = flow_block_cb_lookup(block, cb, cb_priv);
 	if (block_cb) {
 		list_del(&block_cb->list);
 		flow_block_cb_free(block_cb);
 	} else {
 		WARN_ON(true);
 	}
 	up_write(&flow_table->flow_block_lock);
 }

 int flow_offload_route_init(struct flow_offload *flow,
 			    const struct nf_flow_route *route);

 int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow);
 void flow_offload_refresh(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);
 void nf_flow_table_gc_run(struct nf_flowtable *flow_table);
 void nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable,
 			      struct net_device *dev);
 void nf_flow_table_cleanup(struct net_device *dev);

 int nf_flow_table_init(struct nf_flowtable *flow_table);
 void nf_flow_table_free(struct nf_flowtable *flow_table);

 void flow_offload_teardown(struct flow_offload *flow);

 void nf_flow_snat_port(const struct flow_offload *flow,
 		       struct sk_buff *skb, unsigned int thoff,
 		       u8 protocol, enum flow_offload_tuple_dir dir);
 void 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))

 void nf_flow_offload_add(struct nf_flowtable *flowtable,
 			 struct flow_offload *flow);
 void nf_flow_offload_del(struct nf_flowtable *flowtable,
 			 struct flow_offload *flow);
 void nf_flow_offload_stats(struct nf_flowtable *flowtable,
 			   struct flow_offload *flow);

 void nf_flow_table_offload_flush(struct nf_flowtable *flowtable);
 void nf_flow_table_offload_flush_cleanup(struct nf_flowtable *flowtable);

 int nf_flow_table_offload_setup(struct nf_flowtable *flowtable,
 				struct net_device *dev,
 				enum flow_block_command cmd);
 int nf_flow_rule_route_ipv4(struct net *net, const struct flow_offload *flow,
 			    enum flow_offload_tuple_dir dir,
 			    struct nf_flow_rule *flow_rule);
 int nf_flow_rule_route_ipv6(struct net *net, const struct flow_offload *flow,
 			    enum flow_offload_tuple_dir dir,
 			    struct nf_flow_rule *flow_rule);

 int nf_flow_table_offload_init(void);
 void nf_flow_table_offload_exit(void);

 static inline __be16 nf_flow_pppoe_proto(const struct sk_buff *skb)
 {
 	__be16 proto;

 	proto = *((__be16 *)(skb_mac_header(skb) + ETH_HLEN +
 			     sizeof(struct pppoe_hdr)));
 	switch (proto) {
 	case htons(PPP_IP):
 		return htons(ETH_P_IP);
 	case htons(PPP_IPV6):
 		return htons(ETH_P_IPV6);
 	}

 	return 0;
 }

 #endif /* _NF_FLOW_TABLE_H */
	#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-types.h>
	#include <linux/rcupdate.h>
	#include <linux/netfilter.h>
	#include <linux/netfilter/nf_conntrack_tuple_common.h>
	#include <net/flow_offload.h>
	#include <net/dst.h>
	#include <linux/if_pppox.h>
	#include <linux/ppp_defs.h>

	struct nf_flowtable;
	struct nf_flow_rule;
	struct flow_offload;
	enum flow_offload_tuple_dir;

	struct nf_flow_key {
	struct flow_dissector_key_meta meta;
	struct flow_dissector_key_control control;
	struct flow_dissector_key_control enc_control;
	struct flow_dissector_key_basic basic;
	struct flow_dissector_key_vlan vlan;
	struct flow_dissector_key_vlan cvlan;
	union {
	struct flow_dissector_key_ipv4_addrs ipv4;
	struct flow_dissector_key_ipv6_addrs ipv6;
	};
	struct flow_dissector_key_keyid enc_key_id;
	union {
	struct flow_dissector_key_ipv4_addrs enc_ipv4;
	struct flow_dissector_key_ipv6_addrs enc_ipv6;
	};
	struct flow_dissector_key_tcp tcp;
	struct flow_dissector_key_ports tp;
	} __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */

	struct nf_flow_match {
	struct flow_dissector dissector;
	struct nf_flow_key key;
	struct nf_flow_key mask;
	};

	struct nf_flow_rule {
	struct nf_flow_match match;
	struct flow_rule *rule;
	};

	struct nf_flowtable_type {
	struct list_head list;
	int family;
	int (init)(struct nf_flowtable ft);
	int (setup)(struct nf_flowtable ft,
	struct net_device *dev,
	enum flow_block_command cmd);
	int (action)(struct net net,
	const struct flow_offload *flow,
	enum flow_offload_tuple_dir dir,
	struct nf_flow_rule *flow_rule);
	void (free)(struct nf_flowtable ft);
	nf_hookfn *hook;
	struct module *owner;
	};

	enum nf_flowtable_flags {
	NF_FLOWTABLE_HW_OFFLOAD = 0x1, /* NFT_FLOWTABLE_HW_OFFLOAD */
	NF_FLOWTABLE_COUNTER = 0x2, /* NFT_FLOWTABLE_COUNTER */
	};

	struct nf_flowtable {
	struct list_head list;
	struct rhashtable rhashtable;
	int priority;
	const struct nf_flowtable_type *type;
	struct delayed_work gc_work;
	unsigned int flags;
	struct flow_block flow_block;
	struct rw_semaphore flow_block_lock; /* Guards flow_block */
	possible_net_t net;
	};

	static inline bool nf_flowtable_hw_offload(struct nf_flowtable *flowtable)
	{
	return flowtable->flags & NF_FLOWTABLE_HW_OFFLOAD;
	}

	enum flow_offload_tuple_dir {
	FLOW_OFFLOAD_DIR_ORIGINAL = IP_CT_DIR_ORIGINAL,
	FLOW_OFFLOAD_DIR_REPLY = IP_CT_DIR_REPLY,
	};
	#define FLOW_OFFLOAD_DIR_MAX IP_CT_DIR_MAX

	enum flow_offload_xmit_type {
	FLOW_OFFLOAD_XMIT_UNSPEC = 0,
	FLOW_OFFLOAD_XMIT_NEIGH,
	FLOW_OFFLOAD_XMIT_XFRM,
	FLOW_OFFLOAD_XMIT_DIRECT,
	};

	#define NF_FLOW_TABLE_ENCAP_MAX 2

	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;
	struct {
	u16 id;
	__be16 proto;
	} encap[NF_FLOW_TABLE_ENCAP_MAX];

	/* All members above are keys for lookups, see flow_offload_hash(). */
	struct { } __hash;

	u8 dir:2,
	xmit_type:2,
	encap_num:2,
	in_vlan_ingress:2;
	u16 mtu;
	union {
	struct {
	struct dst_entry *dst_cache;
	u32 dst_cookie;
	};
	struct {
	u32 ifidx;
	u32 hw_ifidx;
	u8 h_source[ETH_ALEN];
	u8 h_dest[ETH_ALEN];
	} out;
	};
	};

	struct flow_offload_tuple_rhash {
	struct rhash_head node;
	struct flow_offload_tuple tuple;
	};

	enum nf_flow_flags {
	NF_FLOW_SNAT,
	NF_FLOW_DNAT,
	NF_FLOW_TEARDOWN,
	NF_FLOW_HW,
	NF_FLOW_HW_DYING,
	NF_FLOW_HW_DEAD,
	NF_FLOW_HW_PENDING,
	};

	enum flow_offload_type {
	NF_FLOW_OFFLOAD_UNSPEC = 0,
	NF_FLOW_OFFLOAD_ROUTE,
	};

	struct flow_offload {
	struct flow_offload_tuple_rhash tuplehash[FLOW_OFFLOAD_DIR_MAX];
	struct nf_conn *ct;
	unsigned long flags;
	u16 type;
	u32 timeout;
	struct rcu_head rcu_head;
	};

	#define NF_FLOW_TIMEOUT (30 * HZ)
	#define nf_flowtable_time_stamp (u32)jiffies

	unsigned long flow_offload_get_timeout(struct flow_offload *flow);

	static inline __s32 nf_flow_timeout_delta(unsigned int timeout)
	{
	return (__s32)(timeout - nf_flowtable_time_stamp);
	}

	struct nf_flow_route {
	struct {
	struct dst_entry *dst;
	struct {
	u32 ifindex;
	struct {
	u16 id;
	__be16 proto;
	} encap[NF_FLOW_TABLE_ENCAP_MAX];
	u8 num_encaps:2,
	ingress_vlans:2;
	} in;
	struct {
	u32 ifindex;
	u32 hw_ifindex;
	u8 h_source[ETH_ALEN];
	u8 h_dest[ETH_ALEN];
	} out;
	enum flow_offload_xmit_type xmit_type;
	} tuple[FLOW_OFFLOAD_DIR_MAX];
	};

	struct flow_offload flow_offload_alloc(struct nf_conn ct);
	void flow_offload_free(struct flow_offload *flow);

	static inline int
	nf_flow_table_offload_add_cb(struct nf_flowtable *flow_table,
	flow_setup_cb_t cb, void cb_priv)
	{
	struct flow_block *block = &flow_table->flow_block;
	struct flow_block_cb *block_cb;
	int err = 0;

	down_write(&flow_table->flow_block_lock);
	block_cb = flow_block_cb_lookup(block, cb, cb_priv);
	if (block_cb) {
	err = -EEXIST;
	goto unlock;
	}

	block_cb = flow_block_cb_alloc(cb, cb_priv, cb_priv, NULL);
	if (IS_ERR(block_cb)) {
	err = PTR_ERR(block_cb);
	goto unlock;
	}

	list_add_tail(&block_cb->list, &block->cb_list);

	unlock:
	up_write(&flow_table->flow_block_lock);
	return err;
	}

	static inline void
	nf_flow_table_offload_del_cb(struct nf_flowtable *flow_table,
	flow_setup_cb_t cb, void cb_priv)
	{
	struct flow_block *block = &flow_table->flow_block;
	struct flow_block_cb *block_cb;

	down_write(&flow_table->flow_block_lock);
	block_cb = flow_block_cb_lookup(block, cb, cb_priv);
	if (block_cb) {
	list_del(&block_cb->list);
	flow_block_cb_free(block_cb);
	} else {
	WARN_ON(true);
	}
	up_write(&flow_table->flow_block_lock);
	}

	int flow_offload_route_init(struct flow_offload *flow,
	const struct nf_flow_route *route);

	int flow_offload_add(struct nf_flowtable flow_table, struct flow_offload flow);
	void flow_offload_refresh(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);
	void nf_flow_table_gc_run(struct nf_flowtable *flow_table);
	void nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable,
	struct net_device *dev);
	void nf_flow_table_cleanup(struct net_device *dev);

	int nf_flow_table_init(struct nf_flowtable *flow_table);
	void nf_flow_table_free(struct nf_flowtable *flow_table);

	void flow_offload_teardown(struct flow_offload *flow);

	void nf_flow_snat_port(const struct flow_offload *flow,
	struct sk_buff *skb, unsigned int thoff,
	u8 protocol, enum flow_offload_tuple_dir dir);
	void 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))

	void nf_flow_offload_add(struct nf_flowtable *flowtable,
	struct flow_offload *flow);
	void nf_flow_offload_del(struct nf_flowtable *flowtable,
	struct flow_offload *flow);
	void nf_flow_offload_stats(struct nf_flowtable *flowtable,
	struct flow_offload *flow);

	void nf_flow_table_offload_flush(struct nf_flowtable *flowtable);
	void nf_flow_table_offload_flush_cleanup(struct nf_flowtable *flowtable);

	int nf_flow_table_offload_setup(struct nf_flowtable *flowtable,
	struct net_device *dev,
	enum flow_block_command cmd);
	int nf_flow_rule_route_ipv4(struct net net, const struct flow_offload flow,
	enum flow_offload_tuple_dir dir,
	struct nf_flow_rule *flow_rule);
	int nf_flow_rule_route_ipv6(struct net net, const struct flow_offload flow,
	enum flow_offload_tuple_dir dir,
	struct nf_flow_rule *flow_rule);

	int nf_flow_table_offload_init(void);
	void nf_flow_table_offload_exit(void);

	static inline __be16 nf_flow_pppoe_proto(const struct sk_buff *skb)
	{
	__be16 proto;

	proto = ((__be16 )(skb_mac_header(skb) + ETH_HLEN +
	sizeof(struct pppoe_hdr)));
	switch (proto) {
	case htons(PPP_IP):
	return htons(ETH_P_IP);
	case htons(PPP_IPV6):
	return htons(ETH_P_IPV6);
	}

	return 0;
	}

	#endif /* _NF_FLOW_TABLE_H */