[deliverable/linux.git] / include / net / ip_fib.h

/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET  is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for the Forwarding Information Base.
 *
 * Authors:	A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *		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 _NET_IP_FIB_H
#define _NET_IP_FIB_H

#include <net/flow.h>
#include <linux/seq_file.h>
#include <linux/rcupdate.h>
#include <net/fib_rules.h>
#include <net/inetpeer.h>
#include <linux/percpu.h>

struct fib_config {
	u8			fc_dst_len;
	u8			fc_tos;
	u8			fc_protocol;
	u8			fc_scope;
	u8			fc_type;
	/* 3 bytes unused */
	u32			fc_table;
	__be32			fc_dst;
	__be32			fc_gw;
	int			fc_oif;
	u32			fc_flags;
	u32			fc_priority;
	__be32			fc_prefsrc;
	struct nlattr		*fc_mx;
	struct rtnexthop	*fc_mp;
	int			fc_mx_len;
	int			fc_mp_len;
	u32			fc_flow;
	u32			fc_nlflags;
	struct nl_info		fc_nlinfo;
 };

struct fib_info;
struct rtable;

struct fib_nh_exception {
	struct fib_nh_exception __rcu	*fnhe_next;
	__be32				fnhe_daddr;
	u32				fnhe_pmtu;
	__be32				fnhe_gw;
	unsigned long			fnhe_expires;
	struct rtable __rcu		*fnhe_rth;
	unsigned long			fnhe_stamp;
};

struct fnhe_hash_bucket {
	struct fib_nh_exception __rcu	*chain;
};

#define FNHE_HASH_SIZE		2048
#define FNHE_RECLAIM_DEPTH	5

struct fib_nh {
	struct net_device	*nh_dev;
	struct hlist_node	nh_hash;
	struct fib_info		*nh_parent;
	unsigned int		nh_flags;
	unsigned char		nh_scope;
#ifdef CONFIG_IP_ROUTE_MULTIPATH
	int			nh_weight;
	int			nh_power;
#endif
#ifdef CONFIG_IP_ROUTE_CLASSID
	__u32			nh_tclassid;
#endif
	int			nh_oif;
	__be32			nh_gw;
	__be32			nh_saddr;
	int			nh_saddr_genid;
	struct rtable __rcu * __percpu *nh_pcpu_rth_output;
	struct rtable __rcu	*nh_rth_input;
	struct fnhe_hash_bucket	*nh_exceptions;
};

/*
 * This structure contains data shared by many of routes.
 */

struct fib_info {
	struct hlist_node	fib_hash;
	struct hlist_node	fib_lhash;
	struct net		*fib_net;
	int			fib_treeref;
	atomic_t		fib_clntref;
	unsigned int		fib_flags;
	unsigned char		fib_dead;
	unsigned char		fib_protocol;
	unsigned char		fib_scope;
	__be32			fib_prefsrc;
	u32			fib_priority;
	u32			*fib_metrics;
#define fib_mtu fib_metrics[RTAX_MTU-1]
#define fib_window fib_metrics[RTAX_WINDOW-1]
#define fib_rtt fib_metrics[RTAX_RTT-1]
#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
	int			fib_nhs;
#ifdef CONFIG_IP_ROUTE_MULTIPATH
	int			fib_power;
#endif
	struct rcu_head		rcu;
	struct fib_nh		fib_nh[0];
#define fib_dev		fib_nh[0].nh_dev
};


#ifdef CONFIG_IP_MULTIPLE_TABLES
struct fib_rule;
#endif

struct fib_table;
struct fib_result {
	unsigned char	prefixlen;
	unsigned char	nh_sel;
	unsigned char	type;
	unsigned char	scope;
	u32		tclassid;
	struct fib_info *fi;
	struct fib_table *table;
	struct list_head *fa_head;
};

struct fib_result_nl {
	__be32		fl_addr;   /* To be looked up*/
	u32		fl_mark;
	unsigned char	fl_tos;
	unsigned char   fl_scope;
	unsigned char   tb_id_in;

	unsigned char   tb_id;      /* Results */
	unsigned char	prefixlen;
	unsigned char	nh_sel;
	unsigned char	type;
	unsigned char	scope;
	int             err;      
};

#ifdef CONFIG_IP_ROUTE_MULTIPATH

#define FIB_RES_NH(res)		((res).fi->fib_nh[(res).nh_sel])

#define FIB_TABLE_HASHSZ 2

#else /* CONFIG_IP_ROUTE_MULTIPATH */

#define FIB_RES_NH(res)		((res).fi->fib_nh[0])

#define FIB_TABLE_HASHSZ 256

#endif /* CONFIG_IP_ROUTE_MULTIPATH */

extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);

#define FIB_RES_SADDR(net, res)				\
	((FIB_RES_NH(res).nh_saddr_genid ==		\
	  atomic_read(&(net)->ipv4.dev_addr_genid)) ?	\
	 FIB_RES_NH(res).nh_saddr :			\
	 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
#define FIB_RES_GW(res)			(FIB_RES_NH(res).nh_gw)
#define FIB_RES_DEV(res)		(FIB_RES_NH(res).nh_dev)
#define FIB_RES_OIF(res)		(FIB_RES_NH(res).nh_oif)

#define FIB_RES_PREFSRC(net, res)	((res).fi->fib_prefsrc ? : \
					 FIB_RES_SADDR(net, res))

struct fib_table {
	struct hlist_node	tb_hlist;
	u32			tb_id;
	int			tb_default;
	int			tb_num_default;
	unsigned long		tb_data[0];
};

extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
			    struct fib_result *res, int fib_flags);
extern int fib_table_insert(struct fib_table *, struct fib_config *);
extern int fib_table_delete(struct fib_table *, struct fib_config *);
extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
			  struct netlink_callback *cb);
extern int fib_table_flush(struct fib_table *table);
extern void fib_free_table(struct fib_table *tb);


#ifndef CONFIG_IP_MULTIPLE_TABLES

#define TABLE_LOCAL_INDEX	0
#define TABLE_MAIN_INDEX	1

static inline struct fib_table *fib_get_table(struct net *net, u32 id)
{
	struct hlist_head *ptr;

	ptr = id == RT_TABLE_LOCAL ?
		&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
		&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
	return hlist_entry(ptr->first, struct fib_table, tb_hlist);
}

static inline struct fib_table *fib_new_table(struct net *net, u32 id)
{
	return fib_get_table(net, id);
}

static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
			     struct fib_result *res)
{
	struct fib_table *table;

	table = fib_get_table(net, RT_TABLE_LOCAL);
	if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
		return 0;

	table = fib_get_table(net, RT_TABLE_MAIN);
	if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
		return 0;
	return -ENETUNREACH;
}

#else /* CONFIG_IP_MULTIPLE_TABLES */
extern int __net_init fib4_rules_init(struct net *net);
extern void __net_exit fib4_rules_exit(struct net *net);

extern struct fib_table *fib_new_table(struct net *net, u32 id);
extern struct fib_table *fib_get_table(struct net *net, u32 id);

extern int __fib_lookup(struct net *net, struct flowi4 *flp,
			struct fib_result *res);

static inline int fib_lookup(struct net *net, struct flowi4 *flp,
			     struct fib_result *res)
{
	if (!net->ipv4.fib_has_custom_rules) {
		res->tclassid = 0;
		if (net->ipv4.fib_local &&
		    !fib_table_lookup(net->ipv4.fib_local, flp, res,
				      FIB_LOOKUP_NOREF))
			return 0;
		if (net->ipv4.fib_main &&
		    !fib_table_lookup(net->ipv4.fib_main, flp, res,
				      FIB_LOOKUP_NOREF))
			return 0;
		if (net->ipv4.fib_default &&
		    !fib_table_lookup(net->ipv4.fib_default, flp, res,
				      FIB_LOOKUP_NOREF))
			return 0;
		return -ENETUNREACH;
	}
	return __fib_lookup(net, flp, res);
}

#endif /* CONFIG_IP_MULTIPLE_TABLES */

/* Exported by fib_frontend.c */
extern const struct nla_policy rtm_ipv4_policy[];
extern void		ip_fib_init(void);
extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
			       u8 tos, int oif, struct net_device *dev,
			       struct in_device *idev, u32 *itag);
extern void fib_select_default(struct fib_result *res);
#ifdef CONFIG_IP_ROUTE_CLASSID
static inline int fib_num_tclassid_users(struct net *net)
{
	return net->ipv4.fib_num_tclassid_users;
}
#else
static inline int fib_num_tclassid_users(struct net *net)
{
	return 0;
}
#endif

/* Exported by fib_semantics.c */
extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
extern int fib_sync_down_dev(struct net_device *dev, int force);
extern int fib_sync_down_addr(struct net *net, __be32 local);
extern void fib_update_nh_saddrs(struct net_device *dev);
extern int fib_sync_up(struct net_device *dev);
extern void fib_select_multipath(struct fib_result *res);

/* Exported by fib_trie.c */
extern void fib_trie_init(void);
extern struct fib_table *fib_trie_table(u32 id);

static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
{
#ifdef CONFIG_IP_ROUTE_CLASSID
#ifdef CONFIG_IP_MULTIPLE_TABLES
	u32 rtag;
#endif
	*itag = FIB_RES_NH(*res).nh_tclassid<<16;
#ifdef CONFIG_IP_MULTIPLE_TABLES
	rtag = res->tclassid;
	if (*itag == 0)
		*itag = (rtag<<16);
	*itag |= (rtag>>16);
#endif
#endif
}

extern void free_fib_info(struct fib_info *fi);

static inline void fib_info_put(struct fib_info *fi)
{
	if (atomic_dec_and_test(&fi->fib_clntref))
		free_fib_info(fi);
}

#ifdef CONFIG_PROC_FS
extern int __net_init  fib_proc_init(struct net *net);
extern void __net_exit fib_proc_exit(struct net *net);
#else
static inline int fib_proc_init(struct net *net)
{
	return 0;
}
static inline void fib_proc_exit(struct net *net)
{
}
#endif

#endif  /* _NET_FIB_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Definitions for the Forwarding Information Base.
	7	*
	8	* Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#ifndef _NET_IP_FIB_H
	17	#define _NET_IP_FIB_H
	18
1da177e4 LT	19	#include <net/flow.h>
1da177e4 LT	20	#include <linux/seq_file.h>
4895c771	21	#include <linux/rcupdate.h>
e1ef4bf2	22	#include <net/fib_rules.h>
8e773277	23	#include <net/inetpeer.h>
d26b3a7c	24	#include <linux/percpu.h>
1da177e4	25
4e902c57	26	struct fib_config {
4e902c57	27	u8 fc_dst_len;
4e902c57 TG	28	u8 fc_tos;
	29	u8 fc_protocol;
	30	u8 fc_scope;
	31	u8 fc_type;
b52f070c	32	/* 3 bytes unused */
4e902c57	33	u32 fc_table;
6d85c10a	34	__be32 fc_dst;
6d85c10a	35	__be32 fc_gw;
4e902c57 TG	36	int fc_oif;
	37	u32 fc_flags;
	38	u32 fc_priority;
6d85c10a	39	__be32 fc_prefsrc;
4e902c57 TG	40	struct nlattr *fc_mx;
	41	struct rtnexthop *fc_mp;
	42	int fc_mx_len;
	43	int fc_mp_len;
	44	u32 fc_flow;
4e902c57 TG	45	u32 fc_nlflags;
	46	struct nl_info fc_nlinfo;
	47	};
1da177e4 LT	48
1da177e4 LT	49	struct fib_info;
f2bb4bed	50	struct rtable;
1da177e4	51
4895c771 DM	52	struct fib_nh_exception {
	53	struct fib_nh_exception __rcu *fnhe_next;
	54	__be32 fnhe_daddr;
	55	u32 fnhe_pmtu;
aee06da6	56	__be32 fnhe_gw;
4895c771	57	unsigned long fnhe_expires;
c5038a83	58	struct rtable __rcu *fnhe_rth;
4895c771 DM	59	unsigned long fnhe_stamp;
	60	};
	61
	62	struct fnhe_hash_bucket {
	63	struct fib_nh_exception __rcu *chain;
	64	};
	65
	66	#define FNHE_HASH_SIZE 2048
	67	#define FNHE_RECLAIM_DEPTH 5
	68
1da177e4 LT	69	struct fib_nh {
	70	struct net_device *nh_dev;
	71	struct hlist_node nh_hash;
	72	struct fib_info *nh_parent;
95c96174	73	unsigned int nh_flags;
1da177e4 LT	74	unsigned char nh_scope;
	75	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	76	int nh_weight;
	77	int nh_power;
	78	#endif
c7066f70	79	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	80	__u32 nh_tclassid;
	81	#endif
	82	int nh_oif;
ed49e3ca	83	__be32 nh_gw;
1fc050a1	84	__be32 nh_saddr;
436c3b66	85	int nh_saddr_genid;
d26b3a7c	86	struct rtable __rcu * __percpu *nh_pcpu_rth_output;
54764bb6	87	struct rtable __rcu *nh_rth_input;
4895c771	88	struct fnhe_hash_bucket *nh_exceptions;
1da177e4 LT	89	};
	90
	91	/*
	92	* This structure contains data shared by many of routes.
	93	*/
	94
	95	struct fib_info {
	96	struct hlist_node fib_hash;
	97	struct hlist_node fib_lhash;
7462bd74	98	struct net *fib_net;
1da177e4 LT	99	int fib_treeref;
1da177e4 LT	100	atomic_t fib_clntref;
95c96174	101	unsigned int fib_flags;
37e826c5 DM	102	unsigned char fib_dead;
	103	unsigned char fib_protocol;
	104	unsigned char fib_scope;
b83738ae	105	__be32 fib_prefsrc;
1da177e4	106	u32 fib_priority;
9c150e82	107	u32 *fib_metrics;
1da177e4 LT	108	#define fib_mtu fib_metrics[RTAX_MTU-1]
	109	#define fib_window fib_metrics[RTAX_WINDOW-1]
	110	#define fib_rtt fib_metrics[RTAX_RTT-1]
	111	#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
	112	int fib_nhs;
	113	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	114	int fib_power;
1da177e4	115	#endif
ebc0ffae	116	struct rcu_head rcu;
1da177e4 LT	117	struct fib_nh fib_nh[0];
	118	#define fib_dev fib_nh[0].nh_dev
	119	};
	120
	121
	122	#ifdef CONFIG_IP_MULTIPLE_TABLES
	123	struct fib_rule;
	124	#endif
	125
5b470441	126	struct fib_table;
1da177e4 LT	127	struct fib_result {
	128	unsigned char prefixlen;
	129	unsigned char nh_sel;
	130	unsigned char type;
	131	unsigned char scope;
85b91b03	132	u32 tclassid;
1da177e4	133	struct fib_info *fi;
5b470441 DM	134	struct fib_table *table;
5b470441 DM	135	struct list_head *fa_head;
1da177e4 LT	136	};
1da177e4 LT	137
246955fe	138	struct fib_result_nl {
80e856e1	139	__be32 fl_addr; /* To be looked up*/
5f300893	140	u32 fl_mark;
246955fe RO	141	unsigned char fl_tos;
	142	unsigned char fl_scope;
	143	unsigned char tb_id_in;
	144
	145	unsigned char tb_id; /* Results */
	146	unsigned char prefixlen;
	147	unsigned char nh_sel;
	148	unsigned char type;
	149	unsigned char scope;
	150	int err;
	151	};
1da177e4 LT	152
	153	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	154
	155	#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
1da177e4	156
93456b6d DL	157	#define FIB_TABLE_HASHSZ 2
93456b6d DL	158
1da177e4 LT	159	#else /* CONFIG_IP_ROUTE_MULTIPATH */
	160
	161	#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
1da177e4	162
93456b6d DL	163	#define FIB_TABLE_HASHSZ 256
93456b6d DL	164
1da177e4 LT	165	#endif /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4 LT	166
436c3b66 DM	167	extern __be32 fib_info_update_nh_saddr(struct net net, struct fib_nh nh);
	168
	169	#define FIB_RES_SADDR(net, res) \
	170	((FIB_RES_NH(res).nh_saddr_genid == \
	171	atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
	172	FIB_RES_NH(res).nh_saddr : \
	173	fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
1da177e4 LT	174	#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
	175	#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
	176	#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
	177
436c3b66 DM	178	#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
436c3b66 DM	179	FIB_RES_SADDR(net, res))
1fc050a1	180
1da177e4	181	struct fib_table {
8e773277 DM	182	struct hlist_node tb_hlist;
	183	u32 tb_id;
	184	int tb_default;
	185	int tb_num_default;
8e773277	186	unsigned long tb_data[0];
1da177e4 LT	187	};
1da177e4 LT	188
22bd5b9b	189	extern int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
ebc0ffae	190	struct fib_result *res, int fib_flags);
16c6cf8b SH	191	extern int fib_table_insert(struct fib_table , struct fib_config );
	192	extern int fib_table_delete(struct fib_table , struct fib_config );
	193	extern int fib_table_dump(struct fib_table table, struct sk_buff skb,
	194	struct netlink_callback *cb);
	195	extern int fib_table_flush(struct fib_table *table);
4aa2c466 PE	196	extern void fib_free_table(struct fib_table *tb);
4aa2c466 PE	197
16c6cf8b SH	198
16c6cf8b SH	199
1da177e4 LT	200	#ifndef CONFIG_IP_MULTIPLE_TABLES
1da177e4 LT	201
93456b6d DL	202	#define TABLE_LOCAL_INDEX 0
93456b6d DL	203	#define TABLE_MAIN_INDEX 1
1da177e4	204
8ad4942c	205	static inline struct fib_table fib_get_table(struct net net, u32 id)
1da177e4	206	{
93456b6d DL	207	struct hlist_head *ptr;
	208
	209	ptr = id == RT_TABLE_LOCAL ?
e4aef8ae DL	210	&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
e4aef8ae DL	211	&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
93456b6d	212	return hlist_entry(ptr->first, struct fib_table, tb_hlist);
1da177e4 LT	213	}
1da177e4 LT	214
8ad4942c	215	static inline struct fib_table fib_new_table(struct net net, u32 id)
1da177e4	216	{
8ad4942c	217	return fib_get_table(net, id);
1da177e4 LT	218	}
1da177e4 LT	219
22bd5b9b	220	static inline int fib_lookup(struct net net, const struct flowi4 flp,
da0e28cb	221	struct fib_result *res)
1da177e4	222	{
93456b6d DL	223	struct fib_table *table;
93456b6d DL	224
da0e28cb	225	table = fib_get_table(net, RT_TABLE_LOCAL);
ebc0ffae	226	if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
93456b6d DL	227	return 0;
93456b6d DL	228
da0e28cb	229	table = fib_get_table(net, RT_TABLE_MAIN);
ebc0ffae	230	if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
93456b6d DL	231	return 0;
93456b6d DL	232	return -ENETUNREACH;
1da177e4 LT	233	}
1da177e4 LT	234
1da177e4	235	#else /* CONFIG_IP_MULTIPLE_TABLES */
7b1a74fd DL	236	extern int __net_init fib4_rules_init(struct net *net);
7b1a74fd DL	237	extern void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	238
8ad4942c DL	239	extern struct fib_table fib_new_table(struct net net, u32 id);
8ad4942c DL	240	extern struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	241
f4530fa5 DM	242	extern int __fib_lookup(struct net net, struct flowi4 flp,
	243	struct fib_result *res);
	244
	245	static inline int fib_lookup(struct net net, struct flowi4 flp,
	246	struct fib_result *res)
	247	{
	248	if (!net->ipv4.fib_has_custom_rules) {
85b91b03	249	res->tclassid = 0;
f4530fa5 DM	250	if (net->ipv4.fib_local &&
	251	!fib_table_lookup(net->ipv4.fib_local, flp, res,
	252	FIB_LOOKUP_NOREF))
	253	return 0;
	254	if (net->ipv4.fib_main &&
	255	!fib_table_lookup(net->ipv4.fib_main, flp, res,
	256	FIB_LOOKUP_NOREF))
	257	return 0;
	258	if (net->ipv4.fib_default &&
	259	!fib_table_lookup(net->ipv4.fib_default, flp, res,
	260	FIB_LOOKUP_NOREF))
	261	return 0;
	262	return -ENETUNREACH;
	263	}
	264	return __fib_lookup(net, flp, res);
	265	}
	266
1da177e4 LT	267	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	268
	269	/* Exported by fib_frontend.c */
ef7c79ed	270	extern const struct nla_policy rtm_ipv4_policy[];
1da177e4	271	extern void ip_fib_init(void);
35ebf65e	272	extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
5c04c819 MS	273	extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
5c04c819 MS	274	u8 tos, int oif, struct net_device *dev,
9e56e380	275	struct in_device idev, u32 itag);
0c838ff1	276	extern void fib_select_default(struct fib_result *res);
7a9bc9b8	277	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	278	static inline int fib_num_tclassid_users(struct net *net)
	279	{
	280	return net->ipv4.fib_num_tclassid_users;
	281	}
7a9bc9b8	282	#else
f4530fa5 DM	283	static inline int fib_num_tclassid_users(struct net *net)
	284	{
	285	return 0;
	286	}
7a9bc9b8	287	#endif
14c85021	288
1da177e4	289	/* Exported by fib_semantics.c */
d878e72e	290	extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
85326fa5	291	extern int fib_sync_down_dev(struct net_device *dev, int force);
4814bdbd	292	extern int fib_sync_down_addr(struct net *net, __be32 local);
1fc050a1	293	extern void fib_update_nh_saddrs(struct net_device *dev);
1da177e4	294	extern int fib_sync_up(struct net_device *dev);
1b7fe593	295	extern void fib_select_multipath(struct fib_result *res);
1da177e4	296
5348ba85 DM	297	/* Exported by fib_trie.c */
	298	extern void fib_trie_init(void);
	299	extern struct fib_table *fib_trie_table(u32 id);
1da177e4	300
b6bf3ca0	301	static inline void fib_combine_itag(u32 itag, const struct fib_result res)
1da177e4	302	{
c7066f70	303	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	304	#ifdef CONFIG_IP_MULTIPLE_TABLES
	305	u32 rtag;
	306	#endif
	307	itag = FIB_RES_NH(res).nh_tclassid<<16;
	308	#ifdef CONFIG_IP_MULTIPLE_TABLES
85b91b03	309	rtag = res->tclassid;
1da177e4 LT	310	if (*itag == 0)
	311	*itag = (rtag<<16);
	312	*itag \|= (rtag>>16);
	313	#endif
	314	#endif
	315	}
	316
	317	extern void free_fib_info(struct fib_info *fi);
	318
	319	static inline void fib_info_put(struct fib_info *fi)
	320	{
	321	if (atomic_dec_and_test(&fi->fib_clntref))
	322	free_fib_info(fi);
	323	}
	324
20380731	325	#ifdef CONFIG_PROC_FS
61a02653 DL	326	extern int __net_init fib_proc_init(struct net *net);
61a02653 DL	327	extern void __net_exit fib_proc_exit(struct net *net);
cc8274f5 LZ	328	#else
	329	static inline int fib_proc_init(struct net *net)
	330	{
	331	return 0;
	332	}
	333	static inline void fib_proc_exit(struct net *net)
	334	{
	335	}
20380731 ACM	336	#endif
20380731 ACM	337
1da177e4	338	#endif /* _NET_FIB_H */