/* * *	Generic internet FLOW. * */ #ifndef _NET_FLOW_H#define _NET_FLOW_H #include <linux/in6.h>#include <asm/atomic.h> struct flowi {	int	oif;	int	iif;	__u32	mark; 	union {		struct {			__be32			daddr;			__be32			saddr;			__u8			tos;			__u8			scope;		} ip4_u;				struct {			struct in6_addr		daddr;			struct in6_addr		saddr;			__be32			flowlabel;		} ip6_u; 		struct {			__le16			daddr;			__le16			saddr;			__u8			scope;		} dn_u;	} nl_u;#define fld_dst		nl_u.dn_u.daddr#define fld_src		nl_u.dn_u.saddr#define fld_scope	nl_u.dn_u.scope#define fl6_dst		nl_u.ip6_u.daddr#define fl6_src		nl_u.ip6_u.saddr#define fl6_flowlabel	nl_u.ip6_u.flowlabel#define fl4_dst		nl_u.ip4_u.daddr#define fl4_src		nl_u.ip4_u.saddr#define fl4_tos		nl_u.ip4_u.tos#define fl4_scope	nl_u.ip4_u.scope 	__u8	proto;	__u8	flags;#define FLOWI_FLAG_MULTIPATHOLDROUTE 0x01	union {		struct {			__be16	sport;			__be16	dport;		} ports; 		struct {			__u8	type;			__u8	code;		} icmpt; 		struct {			__le16	sport;			__le16	dport;		} dnports; 		__be32		spi; #ifdef CONFIG_IPV6_MIP6		struct {			__u8	type;		} mht;#endif	} uli_u;#define fl_ip_sport	uli_u.ports.sport#define fl_ip_dport	uli_u.ports.dport#define fl_icmp_type	uli_u.icmpt.type#define fl_icmp_code	uli_u.icmpt.code#define fl_ipsec_spi	uli_u.spi#ifdef CONFIG_IPV6_MIP6#define fl_mh_type	uli_u.mht.type#endif	__u32           secid;	/* used by xfrm; see secid.txt */} __attribute__((__aligned__(BITS_PER_LONG/8))); #define FLOW_DIR_IN	0#define FLOW_DIR_OUT	1#define FLOW_DIR_FWD	2 struct sock;typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,			       void **objp, atomic_t **obj_refp); extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,	 		       flow_resolve_t resolver);extern void flow_cache_flush(void);extern atomic_t flow_cache_genid; #endif