[mirror_ubuntu-bionic-kernel.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;
	int				fnhe_genid;
	__be32				fnhe_daddr;
	u32				fnhe_pmtu;
	__be32				fnhe_gw;
	unsigned long			fnhe_expires;
	struct rtable __rcu		*fnhe_rth_input;
	struct rtable __rcu		*fnhe_rth_output;
	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;
	unsigned char		fib_type;
	__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])
#else /* CONFIG_IP_ROUTE_MULTIPATH */
#define FIB_RES_NH(res)		((res).fi->fib_nh[0])
#endif /* CONFIG_IP_ROUTE_MULTIPATH */

#ifdef CONFIG_IP_MULTIPLE_TABLES
#define FIB_TABLE_HASHSZ 256
#else
#define FIB_TABLE_HASHSZ 2
#endif

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 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 {
4895c771 DM	53	struct fib_nh_exception __rcu *fnhe_next;
5aad1de5	54	int fnhe_genid;
4895c771 DM	55	__be32 fnhe_daddr;
4895c771 DM	56	u32 fnhe_pmtu;
aee06da6	57	__be32 fnhe_gw;
4895c771	58	unsigned long fnhe_expires;
2ffae99d TT	59	struct rtable __rcu *fnhe_rth_input;
2ffae99d TT	60	struct rtable __rcu *fnhe_rth_output;
4895c771 DM	61	unsigned long fnhe_stamp;
	62	};
	63
	64	struct fnhe_hash_bucket {
	65	struct fib_nh_exception __rcu *chain;
	66	};
	67
	68	#define FNHE_HASH_SIZE 2048
	69	#define FNHE_RECLAIM_DEPTH 5
	70
1da177e4 LT	71	struct fib_nh {
	72	struct net_device *nh_dev;
	73	struct hlist_node nh_hash;
	74	struct fib_info *nh_parent;
95c96174	75	unsigned int nh_flags;
1da177e4 LT	76	unsigned char nh_scope;
	77	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	78	int nh_weight;
	79	int nh_power;
	80	#endif
c7066f70	81	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	82	__u32 nh_tclassid;
	83	#endif
	84	int nh_oif;
ed49e3ca	85	__be32 nh_gw;
1fc050a1	86	__be32 nh_saddr;
436c3b66	87	int nh_saddr_genid;
d26b3a7c	88	struct rtable __rcu * __percpu *nh_pcpu_rth_output;
54764bb6	89	struct rtable __rcu *nh_rth_input;
4895c771	90	struct fnhe_hash_bucket *nh_exceptions;
1da177e4 LT	91	};
	92
	93	/*
	94	* This structure contains data shared by many of routes.
	95	*/
	96
	97	struct fib_info {
	98	struct hlist_node fib_hash;
	99	struct hlist_node fib_lhash;
7462bd74	100	struct net *fib_net;
1da177e4 LT	101	int fib_treeref;
1da177e4 LT	102	atomic_t fib_clntref;
95c96174	103	unsigned int fib_flags;
37e826c5 DM	104	unsigned char fib_dead;
	105	unsigned char fib_protocol;
	106	unsigned char fib_scope;
f4ef85bb	107	unsigned char fib_type;
b83738ae	108	__be32 fib_prefsrc;
1da177e4	109	u32 fib_priority;
9c150e82	110	u32 *fib_metrics;
1da177e4 LT	111	#define fib_mtu fib_metrics[RTAX_MTU-1]
	112	#define fib_window fib_metrics[RTAX_WINDOW-1]
	113	#define fib_rtt fib_metrics[RTAX_RTT-1]
	114	#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
	115	int fib_nhs;
	116	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	117	int fib_power;
1da177e4	118	#endif
ebc0ffae	119	struct rcu_head rcu;
1da177e4 LT	120	struct fib_nh fib_nh[0];
	121	#define fib_dev fib_nh[0].nh_dev
	122	};
	123
	124
	125	#ifdef CONFIG_IP_MULTIPLE_TABLES
	126	struct fib_rule;
	127	#endif
	128
5b470441	129	struct fib_table;
1da177e4 LT	130	struct fib_result {
	131	unsigned char prefixlen;
	132	unsigned char nh_sel;
	133	unsigned char type;
	134	unsigned char scope;
85b91b03	135	u32 tclassid;
1da177e4	136	struct fib_info *fi;
5b470441 DM	137	struct fib_table *table;
5b470441 DM	138	struct list_head *fa_head;
1da177e4 LT	139	};
1da177e4 LT	140
246955fe	141	struct fib_result_nl {
80e856e1	142	__be32 fl_addr; /* To be looked up*/
5f300893	143	u32 fl_mark;
246955fe RO	144	unsigned char fl_tos;
	145	unsigned char fl_scope;
	146	unsigned char tb_id_in;
	147
	148	unsigned char tb_id; /* Results */
	149	unsigned char prefixlen;
	150	unsigned char nh_sel;
	151	unsigned char type;
	152	unsigned char scope;
	153	int err;
	154	};
1da177e4 LT	155
1da177e4 LT	156	#ifdef CONFIG_IP_ROUTE_MULTIPATH
1da177e4	157	#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
1da177e4	158	#else /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	159	#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
5b9e12db	160	#endif /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	161
5b9e12db	162	#ifdef CONFIG_IP_MULTIPLE_TABLES
93456b6d	163	#define FIB_TABLE_HASHSZ 256
5b9e12db DL	164	#else
	165	#define FIB_TABLE_HASHSZ 2
	166	#endif
1da177e4	167
436c3b66 DM	168	extern __be32 fib_info_update_nh_saddr(struct net net, struct fib_nh nh);
	169
	170	#define FIB_RES_SADDR(net, res) \
	171	((FIB_RES_NH(res).nh_saddr_genid == \
	172	atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
	173	FIB_RES_NH(res).nh_saddr : \
	174	fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
1da177e4 LT	175	#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
	176	#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
	177	#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
	178
436c3b66 DM	179	#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
436c3b66 DM	180	FIB_RES_SADDR(net, res))
1fc050a1	181
1da177e4	182	struct fib_table {
8e773277 DM	183	struct hlist_node tb_hlist;
	184	u32 tb_id;
	185	int tb_default;
	186	int tb_num_default;
8e773277	187	unsigned long tb_data[0];
1da177e4 LT	188	};
1da177e4 LT	189
22bd5b9b	190	extern int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
ebc0ffae	191	struct fib_result *res, int fib_flags);
16c6cf8b SH	192	extern int fib_table_insert(struct fib_table , struct fib_config );
	193	extern int fib_table_delete(struct fib_table , struct fib_config );
	194	extern int fib_table_dump(struct fib_table table, struct sk_buff skb,
	195	struct netlink_callback *cb);
	196	extern int fib_table_flush(struct fib_table *table);
4aa2c466 PE	197	extern void fib_free_table(struct fib_table *tb);
4aa2c466 PE	198
16c6cf8b SH	199
16c6cf8b SH	200
1da177e4 LT	201	#ifndef CONFIG_IP_MULTIPLE_TABLES
1da177e4 LT	202
93456b6d DL	203	#define TABLE_LOCAL_INDEX 0
93456b6d DL	204	#define TABLE_MAIN_INDEX 1
1da177e4	205
8ad4942c	206	static inline struct fib_table fib_get_table(struct net net, u32 id)
1da177e4	207	{
93456b6d DL	208	struct hlist_head *ptr;
	209
	210	ptr = id == RT_TABLE_LOCAL ?
e4aef8ae DL	211	&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
e4aef8ae DL	212	&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
93456b6d	213	return hlist_entry(ptr->first, struct fib_table, tb_hlist);
1da177e4 LT	214	}
1da177e4 LT	215
8ad4942c	216	static inline struct fib_table fib_new_table(struct net net, u32 id)
1da177e4	217	{
8ad4942c	218	return fib_get_table(net, id);
1da177e4 LT	219	}
1da177e4 LT	220
22bd5b9b	221	static inline int fib_lookup(struct net net, const struct flowi4 flp,
da0e28cb	222	struct fib_result *res)
1da177e4	223	{
93456b6d DL	224	struct fib_table *table;
93456b6d DL	225
da0e28cb	226	table = fib_get_table(net, RT_TABLE_LOCAL);
ebc0ffae	227	if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
93456b6d DL	228	return 0;
93456b6d DL	229
da0e28cb	230	table = fib_get_table(net, RT_TABLE_MAIN);
ebc0ffae	231	if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
93456b6d DL	232	return 0;
93456b6d DL	233	return -ENETUNREACH;
1da177e4 LT	234	}
1da177e4 LT	235
1da177e4	236	#else /* CONFIG_IP_MULTIPLE_TABLES */
7b1a74fd DL	237	extern int __net_init fib4_rules_init(struct net *net);
7b1a74fd DL	238	extern void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	239
8ad4942c DL	240	extern struct fib_table fib_new_table(struct net net, u32 id);
8ad4942c DL	241	extern struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	242
f4530fa5 DM	243	extern int __fib_lookup(struct net net, struct flowi4 flp,
	244	struct fib_result *res);
	245
	246	static inline int fib_lookup(struct net net, struct flowi4 flp,
	247	struct fib_result *res)
	248	{
	249	if (!net->ipv4.fib_has_custom_rules) {
85b91b03	250	res->tclassid = 0;
f4530fa5 DM	251	if (net->ipv4.fib_local &&
	252	!fib_table_lookup(net->ipv4.fib_local, flp, res,
	253	FIB_LOOKUP_NOREF))
	254	return 0;
	255	if (net->ipv4.fib_main &&
	256	!fib_table_lookup(net->ipv4.fib_main, flp, res,
	257	FIB_LOOKUP_NOREF))
	258	return 0;
	259	if (net->ipv4.fib_default &&
	260	!fib_table_lookup(net->ipv4.fib_default, flp, res,
	261	FIB_LOOKUP_NOREF))
	262	return 0;
	263	return -ENETUNREACH;
	264	}
	265	return __fib_lookup(net, flp, res);
	266	}
	267
1da177e4 LT	268	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	269
	270	/* Exported by fib_frontend.c */
ef7c79ed	271	extern const struct nla_policy rtm_ipv4_policy[];
1da177e4	272	extern void ip_fib_init(void);
35ebf65e	273	extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
5c04c819 MS	274	extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
5c04c819 MS	275	u8 tos, int oif, struct net_device *dev,
9e56e380	276	struct in_device idev, u32 itag);
0c838ff1	277	extern void fib_select_default(struct fib_result *res);
7a9bc9b8	278	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	279	static inline int fib_num_tclassid_users(struct net *net)
	280	{
	281	return net->ipv4.fib_num_tclassid_users;
	282	}
7a9bc9b8	283	#else
f4530fa5 DM	284	static inline int fib_num_tclassid_users(struct net *net)
	285	{
	286	return 0;
	287	}
7a9bc9b8	288	#endif
14c85021	289
1da177e4	290	/* Exported by fib_semantics.c */
d878e72e	291	extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
85326fa5	292	extern int fib_sync_down_dev(struct net_device *dev, int force);
4814bdbd	293	extern int fib_sync_down_addr(struct net *net, __be32 local);
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 */