[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>

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