[linux-block.git] / include / net / ip6_fib.h

/*
 *	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

#ifdef __KERNEL__

#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>

#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_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
{
	union {
		struct dst_entry	dst;
	} u;

	struct inet6_dev		*rt6i_idev;

#define rt6i_dev			u.dst.dev
#define rt6i_nexthop			u.dst.neighbour
#define rt6i_expires			u.dst.expires

	struct fib6_node		*rt6i_node;

	struct in6_addr			rt6i_gateway;
	
	u32				rt6i_flags;
	u32				rt6i_metric;
	atomic_t			rt6i_ref;

	/* more non-fragment space at head required */
	unsigned short			rt6i_nfheader_len;

	u8				rt6i_protocol;

	struct fib6_table		*rt6i_table;

	struct rt6key			rt6i_dst;

#ifdef CONFIG_XFRM
	u32				rt6i_flow_cache_genid;
#endif

	struct rt6key			rt6i_src;
};

static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
{
	return ((struct rt6_info *)dst)->rt6i_idev;
}

struct fib6_walker_t
{
	struct fib6_walker_t *prev, *next;
	struct fib6_node *root, *node;
	struct rt6_info *leaf;
	unsigned char state;
	unsigned char prune;
	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 flowi *, 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 flowi *fl, int flags,
						  pol_lookup_t lookup);

extern struct fib6_node		*fib6_lookup(struct fib6_node *root,
					     struct in6_addr *daddr,
					     struct in6_addr *saddr);

struct fib6_node		*fib6_locate(struct fib6_node *root,
					     struct in6_addr *daddr, int dst_len,
					     struct in6_addr *saddr, int src_len);

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_TABLES
extern int			fib6_rules_init(void);
extern void			fib6_rules_cleanup(void);
#else
static inline int               fib6_rules_init(void)
{
	return 0;
}
static inline void              fib6_rules_cleanup(void)
{
	return ;
}
#endif
#endif
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Linux INET6 implementation
	3	*
	4	* Authors:
	5	* Pedro Roque <roque@di.fc.ul.pt>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*/
	12
	13	#ifndef _IP6_FIB_H
	14	#define _IP6_FIB_H
	15
	16	#ifdef __KERNEL__
	17
	18	#include <linux/ipv6_route.h>
1da177e4 LT	19	#include <linux/rtnetlink.h>
1da177e4 LT	20	#include <linux/spinlock.h>
86872cb5 TG	21	#include <net/dst.h>
	22	#include <net/flow.h>
	23	#include <net/netlink.h>
1da177e4	24
a33bc5c1 NH	25	#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	26	#define FIB6_TABLE_HASHSZ 256
	27	#else
	28	#define FIB6_TABLE_HASHSZ 1
	29	#endif
	30
1da177e4 LT	31	struct rt6_info;
1da177e4 LT	32
86872cb5 TG	33	struct fib6_config
	34	{
	35	u32 fc_table;
	36	u32 fc_metric;
	37	int fc_dst_len;
	38	int fc_src_len;
	39	int fc_ifindex;
	40	u32 fc_flags;
	41	u32 fc_protocol;
	42
	43	struct in6_addr fc_dst;
	44	struct in6_addr fc_src;
	45	struct in6_addr fc_gateway;
	46
	47	unsigned long fc_expires;
	48	struct nlattr *fc_mx;
	49	int fc_mx_len;
	50
	51	struct nl_info fc_nlinfo;
	52	};
	53
1da177e4 LT	54	struct fib6_node
	55	{
	56	struct fib6_node *parent;
	57	struct fib6_node *left;
	58	struct fib6_node *right;
8bce65b9	59	#ifdef CONFIG_IPV6_SUBTREES
1da177e4	60	struct fib6_node *subtree;
8bce65b9	61	#endif
1da177e4 LT	62	struct rt6_info *leaf;
	63
	64	__u16 fn_bit; /* bit key */
	65	__u16 fn_flags;
	66	__u32 fn_sernum;
f11e6659	67	struct rt6_info *rr_ptr;
1da177e4 LT	68	};
1da177e4 LT	69
7fc33165 YH	70	#ifndef CONFIG_IPV6_SUBTREES
	71	#define FIB6_SUBTREE(fn) NULL
	72	#else
	73	#define FIB6_SUBTREE(fn) ((fn)->subtree)
	74	#endif
1da177e4 LT	75
	76	/*
	77	* routing information
	78	*
	79	*/
	80
	81	struct rt6key
	82	{
	83	struct in6_addr addr;
	84	int plen;
	85	};
	86
c71099ac TG	87	struct fib6_table;
c71099ac TG	88
1da177e4 LT	89	struct rt6_info
	90	{
	91	union {
	92	struct dst_entry dst;
1da177e4 LT	93	} u;
	94
	95	struct inet6_dev *rt6i_idev;
	96
	97	#define rt6i_dev u.dst.dev
	98	#define rt6i_nexthop u.dst.neighbour
	99	#define rt6i_expires u.dst.expires
	100
	101	struct fib6_node *rt6i_node;
	102
	103	struct in6_addr rt6i_gateway;
	104
	105	u32 rt6i_flags;
	106	u32 rt6i_metric;
	107	atomic_t rt6i_ref;
	108
b4ce9277	109	/* more non-fragment space at head required */
a1b05140	110	unsigned short rt6i_nfheader_len;
1da177e4 LT	111
1da177e4 LT	112	u8 rt6i_protocol;
a47ed4cd	113
b4ce9277 HX	114	struct fib6_table *rt6i_table;
	115
	116	struct rt6key rt6i_dst;
	117
a47ed4cd NT	118	#ifdef CONFIG_XFRM
	119	u32 rt6i_flow_cache_genid;
	120	#endif
b4ce9277 HX	121
b4ce9277 HX	122	struct rt6key rt6i_src;
1da177e4 LT	123	};
1da177e4 LT	124
7a3025b1 YH	125	static inline struct inet6_dev ip6_dst_idev(struct dst_entry dst)
	126	{
	127	return ((struct rt6_info *)dst)->rt6i_idev;
	128	}
	129
1da177e4 LT	130	struct fib6_walker_t
	131	{
	132	struct fib6_walker_t prev, next;
	133	struct fib6_node root, node;
	134	struct rt6_info *leaf;
	135	unsigned char state;
	136	unsigned char prune;
	137	int (func)(struct fib6_walker_t );
	138	void *args;
	139	};
	140
1da177e4 LT	141	struct rt6_statistics {
	142	__u32 fib_nodes;
	143	__u32 fib_route_nodes;
	144	__u32 fib_rt_alloc; /* permanent routes */
	145	__u32 fib_rt_entries; /* rt entries in table */
	146	__u32 fib_rt_cache; /* cache routes */
	147	__u32 fib_discarded_routes;
	148	};
	149
	150	#define RTN_TL_ROOT 0x0001
	151	#define RTN_ROOT 0x0002 /* tree root node */
	152	#define RTN_RTINFO 0x0004 /* node with valid routing info */
	153
	154	/*
	155	* priority levels (or metrics)
	156	*
	157	*/
	158
1da177e4	159
c71099ac TG	160	struct fib6_table {
	161	struct hlist_node tb6_hlist;
	162	u32 tb6_id;
	163	rwlock_t tb6_lock;
	164	struct fib6_node tb6_root;
	165	};
	166
	167	#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
	168	#define RT6_TABLE_MAIN RT_TABLE_MAIN
c71099ac TG	169	#define RT6_TABLE_DFLT RT6_TABLE_MAIN
	170	#define RT6_TABLE_INFO RT6_TABLE_MAIN
	171	#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
	172
	173	#ifdef CONFIG_IPV6_MULTIPLE_TABLES
	174	#define FIB6_TABLE_MIN 1
	175	#define FIB6_TABLE_MAX RT_TABLE_MAX
101367c2	176	#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
c71099ac TG	177	#else
	178	#define FIB6_TABLE_MIN RT_TABLE_MAIN
	179	#define FIB6_TABLE_MAX FIB6_TABLE_MIN
101367c2	180	#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
c71099ac TG	181	#endif
c71099ac TG	182
8ed67789 DL	183	typedef struct rt6_info (pol_lookup_t)(struct net *,
8ed67789 DL	184	struct fib6_table *,
c71099ac	185	struct flowi *, int);
1da177e4 LT	186
	187	/*
	188	* exported functions
	189	*/
	190
58f09b78 DL	191	extern struct fib6_table fib6_get_table(struct net net, u32 id);
	192	extern struct fib6_table fib6_new_table(struct net net, u32 id);
	193	extern struct dst_entry fib6_rule_lookup(struct net net,
	194	struct flowi *fl, int flags,
	195	pol_lookup_t lookup);
c71099ac	196
1da177e4 LT	197	extern struct fib6_node fib6_lookup(struct fib6_node root,
	198	struct in6_addr *daddr,
	199	struct in6_addr *saddr);
	200
	201	struct fib6_node fib6_locate(struct fib6_node root,
	202	struct in6_addr *daddr, int dst_len,
	203	struct in6_addr *saddr, int src_len);
	204
f3db4851 DL	205	extern void fib6_clean_all(struct net *net,
f3db4851 DL	206	int (func)(struct rt6_info , void *arg),
c71099ac TG	207	int prune, void *arg);
c71099ac TG	208
1da177e4 LT	209	extern int fib6_add(struct fib6_node *root,
1da177e4 LT	210	struct rt6_info *rt,
86872cb5	211	struct nl_info *info);
1da177e4 LT	212
1da177e4 LT	213	extern int fib6_del(struct rt6_info *rt,
86872cb5	214	struct nl_info *info);
1da177e4 LT	215
1da177e4 LT	216	extern void inet6_rt_notify(int event, struct rt6_info *rt,
86872cb5	217	struct nl_info *info);
1da177e4	218
5b7c931d DL	219	extern void fib6_run_gc(unsigned long expires,
5b7c931d DL	220	struct net *net);
1da177e4 LT	221
	222	extern void fib6_gc_cleanup(void);
	223
d63bddbe	224	extern int fib6_init(void);
101367c2	225
7e5449c2	226	#ifdef CONFIG_IPV6_MULTIPLE_TABLES
9eb87f3f	227	extern int fib6_rules_init(void);
101367c2	228	extern void fib6_rules_cleanup(void);
7e5449c2 DL	229	#else
	230	static inline int fib6_rules_init(void)
	231	{
	232	return 0;
	233	}
	234	static inline void fib6_rules_cleanup(void)
	235	{
	236	return ;
	237	}
	238	#endif
1da177e4 LT	239	#endif
1da177e4 LT	240	#endif