/* *	Linux INET6 implementation  * *	Authors: *	Pedro Roque		<roque@di.fc.ul.pt>	 * *	This program is free software; you can redistribute it and/or *      modify it under the terms of the GNU General Public License *      as published by the Free Software Foundation; either version *      2 of the License, or (at your option) any later version. */ #ifndef _IP6_FIB_H#define _IP6_FIB_H #include <linux/ipv6_route.h>#include <linux/rtnetlink.h>#include <linux/spinlock.h>#include <net/dst.h>#include <net/flow.h>#include <net/netlink.h>#include <net/inetpeer.h> #ifdef CONFIG_IPV6_MULTIPLE_TABLES#define FIB6_TABLE_HASHSZ 256#else#define FIB6_TABLE_HASHSZ 1#endif struct rt6_info; struct fib6_config {	u32		fc_table;	u32		fc_metric;	int		fc_dst_len;	int		fc_src_len;	int		fc_ifindex;	u32		fc_flags;	u32		fc_protocol; 	struct in6_addr	fc_dst;	struct in6_addr	fc_src;	struct in6_addr	fc_prefsrc;	struct in6_addr	fc_gateway; 	unsigned long	fc_expires;	struct nlattr	*fc_mx;	int		fc_mx_len; 	struct nl_info	fc_nlinfo;}; struct fib6_node {	struct fib6_node	*parent;	struct fib6_node	*left;	struct fib6_node	*right;#ifdef CONFIG_IPV6_SUBTREES	struct fib6_node	*subtree;#endif	struct rt6_info		*leaf; 	__u16			fn_bit;		/* bit key */	__u16			fn_flags;	__u32			fn_sernum;	struct rt6_info		*rr_ptr;}; #ifndef CONFIG_IPV6_SUBTREES#define FIB6_SUBTREE(fn)	NULL#else#define FIB6_SUBTREE(fn)	((fn)->subtree)#endif /* *	routing information * */ struct rt6key {	struct in6_addr	addr;	int		plen;}; struct fib6_table; struct rt6_info {	struct dst_entry		dst; 	/*	 * Tail elements of dst_entry (__refcnt etc.)	 * and these elements (rarely used in hot path) are in	 * the same cache line.	 */	struct fib6_table		*rt6i_table;	struct fib6_node		*rt6i_node; 	struct in6_addr			rt6i_gateway; 	atomic_t			rt6i_ref; 	/* These are in a separate cache line. */	struct rt6key			rt6i_dst ____cacheline_aligned_in_smp;	u32				rt6i_flags;	struct rt6key			rt6i_src;	struct rt6key			rt6i_prefsrc;	u32				rt6i_metric;	u32				rt6i_peer_genid; 	struct inet6_dev		*rt6i_idev;	struct inet_peer		*rt6i_peer; #ifdef CONFIG_XFRM	u32				rt6i_flow_cache_genid;#endif	/* more non-fragment space at head required */	unsigned short			rt6i_nfheader_len; 	u8				rt6i_protocol;}; static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst){	return ((struct rt6_info *)dst)->rt6i_idev;} static inline void rt6_clean_expires(struct rt6_info *rt){	if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)		dst_release(rt->dst.from); 	rt->rt6i_flags &= ~RTF_EXPIRES;	rt->dst.from = NULL;} static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires){	if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)		dst_release(rt->dst.from); 	rt->rt6i_flags |= RTF_EXPIRES;	rt->dst.expires = expires;} static inline void rt6_update_expires(struct rt6_info *rt, int timeout){	if (!(rt->rt6i_flags & RTF_EXPIRES)) {		if (rt->dst.from)			dst_release(rt->dst.from);		/* dst_set_expires relies on expires == 0 		 * if it has not been set previously.		 */		rt->dst.expires = 0;	} 	dst_set_expires(&rt->dst, timeout);	rt->rt6i_flags |= RTF_EXPIRES;} static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from){	struct dst_entry *new = (struct dst_entry *) from; 	if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {		if (new == rt->dst.from)			return;		dst_release(rt->dst.from);	} 	rt->rt6i_flags &= ~RTF_EXPIRES;	rt->dst.from = new;	dst_hold(new);} struct fib6_walker_t {	struct list_head lh;	struct fib6_node *root, *node;	struct rt6_info *leaf;	unsigned char state;	unsigned char prune;	unsigned int skip;	unsigned int count;	int (*func)(struct fib6_walker_t *);	void *args;}; struct rt6_statistics {	__u32		fib_nodes;	__u32		fib_route_nodes;	__u32		fib_rt_alloc;		/* permanent routes	*/	__u32		fib_rt_entries;		/* rt entries in table	*/	__u32		fib_rt_cache;		/* cache routes		*/	__u32		fib_discarded_routes;}; #define RTN_TL_ROOT	0x0001#define RTN_ROOT	0x0002		/* tree root node		*/#define RTN_RTINFO	0x0004		/* node with valid routing info	*/ /* *	priority levels (or metrics) * */  struct fib6_table {	struct hlist_node	tb6_hlist;	u32			tb6_id;	rwlock_t		tb6_lock;	struct fib6_node	tb6_root;}; #define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC#define RT6_TABLE_MAIN		RT_TABLE_MAIN#define RT6_TABLE_DFLT		RT6_TABLE_MAIN#define RT6_TABLE_INFO		RT6_TABLE_MAIN#define RT6_TABLE_PREFIX	RT6_TABLE_MAIN #ifdef CONFIG_IPV6_MULTIPLE_TABLES#define FIB6_TABLE_MIN		1#define FIB6_TABLE_MAX		RT_TABLE_MAX#define RT6_TABLE_LOCAL		RT_TABLE_LOCAL#else#define FIB6_TABLE_MIN		RT_TABLE_MAIN#define FIB6_TABLE_MAX		FIB6_TABLE_MIN#define RT6_TABLE_LOCAL		RT6_TABLE_MAIN#endif typedef struct rt6_info *(*pol_lookup_t)(struct net *,					 struct fib6_table *,					 struct flowi6 *, int); /* *	exported functions */ extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);extern struct dst_entry         *fib6_rule_lookup(struct net *net,						  struct flowi6 *fl6, int flags,						  pol_lookup_t lookup); extern struct fib6_node		*fib6_lookup(struct fib6_node *root,					     const struct in6_addr *daddr,					     const struct in6_addr *saddr); struct fib6_node		*fib6_locate(struct fib6_node *root,					     const struct in6_addr *daddr, int dst_len,					     const struct in6_addr *saddr, int src_len); extern void			fib6_clean_all_ro(struct net *net,					       int (*func)(struct rt6_info *, void *arg),					       int prune, void *arg); extern void			fib6_clean_all(struct net *net,					       int (*func)(struct rt6_info *, void *arg),					       int prune, void *arg); extern int			fib6_add(struct fib6_node *root,					 struct rt6_info *rt,					 struct nl_info *info); extern int			fib6_del(struct rt6_info *rt,					 struct nl_info *info); extern void			inet6_rt_notify(int event, struct rt6_info *rt,						struct nl_info *info); extern void			fib6_run_gc(unsigned long expires,					    struct net *net); extern void			fib6_gc_cleanup(void); extern int			fib6_init(void); #ifdef CONFIG_IPV6_MULTIPLE_TABLESextern int			fib6_rules_init(void);extern void			fib6_rules_cleanup(void);#elsestatic inline int               fib6_rules_init(void){	return 0;}static inline void              fib6_rules_cleanup(void){	return ;}#endif#endif