[linux-2.6-block.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_SHIFT		11
#define FNHE_HASH_SIZE		(1 << FNHE_HASH_SHIFT)
#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	__rcu *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

__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];
};

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


#ifndef CONFIG_IP_MULTIPLE_TABLES

#define TABLE_LOCAL_INDEX	(RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
#define TABLE_MAIN_INDEX	(RT_TABLE_MAIN  & (FIB_TABLE_HASHSZ - 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)
{
	int err = -ENETUNREACH;

	rcu_read_lock();

	if (!fib_table_lookup(fib_get_table(net, RT_TABLE_LOCAL), flp, res,
			      FIB_LOOKUP_NOREF) ||
	    !fib_table_lookup(fib_get_table(net, RT_TABLE_MAIN), flp, res,
			      FIB_LOOKUP_NOREF))
		err = 0;

	rcu_read_unlock();

	return err;
}

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

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

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) {
		int err = -ENETUNREACH;

		rcu_read_lock();

		res->tclassid = 0;
		if ((net->ipv4.fib_local &&
		     !fib_table_lookup(net->ipv4.fib_local, flp, res,
				       FIB_LOOKUP_NOREF)) ||
		    (net->ipv4.fib_main &&
		     !fib_table_lookup(net->ipv4.fib_main, flp, res,
				       FIB_LOOKUP_NOREF)) ||
		    (net->ipv4.fib_default &&
		     !fib_table_lookup(net->ipv4.fib_default, flp, res,
				       FIB_LOOKUP_NOREF)))
			err = 0;

		rcu_read_unlock();

		return err;
	}
	return __fib_lookup(net, flp, res);
}

#endif /* CONFIG_IP_MULTIPLE_TABLES */

/* Exported by fib_frontend.c */
extern const struct nla_policy rtm_ipv4_policy[];
void ip_fib_init(void);
__be32 fib_compute_spec_dst(struct sk_buff *skb);
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);
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 */
int ip_fib_check_default(__be32 gw, struct net_device *dev);
int fib_sync_down_dev(struct net_device *dev, int force);
int fib_sync_down_addr(struct net *net, __be32 local);
int fib_sync_up(struct net_device *dev);
void fib_select_multipath(struct fib_result *res);

/* Exported by fib_trie.c */
void fib_trie_init(void);
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
}

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
int __net_init fib_proc_init(struct net *net);
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
d546c621 ED	68	#define FNHE_HASH_SHIFT 11
d546c621 ED	69	#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
4895c771 DM	70	#define FNHE_RECLAIM_DEPTH 5
4895c771 DM	71
1da177e4 LT	72	struct fib_nh {
	73	struct net_device *nh_dev;
	74	struct hlist_node nh_hash;
	75	struct fib_info *nh_parent;
95c96174	76	unsigned int nh_flags;
1da177e4 LT	77	unsigned char nh_scope;
	78	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	79	int nh_weight;
	80	int nh_power;
	81	#endif
c7066f70	82	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	83	__u32 nh_tclassid;
	84	#endif
	85	int nh_oif;
ed49e3ca	86	__be32 nh_gw;
1fc050a1	87	__be32 nh_saddr;
436c3b66	88	int nh_saddr_genid;
d26b3a7c	89	struct rtable __rcu * __percpu *nh_pcpu_rth_output;
54764bb6	90	struct rtable __rcu *nh_rth_input;
caa41527	91	struct fnhe_hash_bucket __rcu *nh_exceptions;
1da177e4 LT	92	};
	93
	94	/*
	95	* This structure contains data shared by many of routes.
	96	*/
	97
	98	struct fib_info {
	99	struct hlist_node fib_hash;
	100	struct hlist_node fib_lhash;
7462bd74	101	struct net *fib_net;
1da177e4 LT	102	int fib_treeref;
1da177e4 LT	103	atomic_t fib_clntref;
95c96174	104	unsigned int fib_flags;
37e826c5 DM	105	unsigned char fib_dead;
	106	unsigned char fib_protocol;
	107	unsigned char fib_scope;
f4ef85bb	108	unsigned char fib_type;
b83738ae	109	__be32 fib_prefsrc;
1da177e4	110	u32 fib_priority;
9c150e82	111	u32 *fib_metrics;
1da177e4 LT	112	#define fib_mtu fib_metrics[RTAX_MTU-1]
	113	#define fib_window fib_metrics[RTAX_WINDOW-1]
	114	#define fib_rtt fib_metrics[RTAX_RTT-1]
	115	#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
	116	int fib_nhs;
	117	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	118	int fib_power;
1da177e4	119	#endif
ebc0ffae	120	struct rcu_head rcu;
1da177e4 LT	121	struct fib_nh fib_nh[0];
	122	#define fib_dev fib_nh[0].nh_dev
	123	};
	124
	125
	126	#ifdef CONFIG_IP_MULTIPLE_TABLES
	127	struct fib_rule;
	128	#endif
	129
5b470441	130	struct fib_table;
1da177e4 LT	131	struct fib_result {
	132	unsigned char prefixlen;
	133	unsigned char nh_sel;
	134	unsigned char type;
	135	unsigned char scope;
85b91b03	136	u32 tclassid;
1da177e4	137	struct fib_info *fi;
5b470441 DM	138	struct fib_table *table;
5b470441 DM	139	struct list_head *fa_head;
1da177e4 LT	140	};
1da177e4 LT	141
246955fe	142	struct fib_result_nl {
80e856e1	143	__be32 fl_addr; /* To be looked up*/
5f300893	144	u32 fl_mark;
246955fe RO	145	unsigned char fl_tos;
	146	unsigned char fl_scope;
	147	unsigned char tb_id_in;
	148
	149	unsigned char tb_id; /* Results */
	150	unsigned char prefixlen;
	151	unsigned char nh_sel;
	152	unsigned char type;
	153	unsigned char scope;
	154	int err;
	155	};
1da177e4 LT	156
1da177e4 LT	157	#ifdef CONFIG_IP_ROUTE_MULTIPATH
1da177e4	158	#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
1da177e4	159	#else /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	160	#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
5b9e12db	161	#endif /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	162
5b9e12db	163	#ifdef CONFIG_IP_MULTIPLE_TABLES
93456b6d	164	#define FIB_TABLE_HASHSZ 256
5b9e12db DL	165	#else
	166	#define FIB_TABLE_HASHSZ 2
	167	#endif
1da177e4	168
5c3a0fd7	169	__be32 fib_info_update_nh_saddr(struct net net, struct fib_nh nh);
436c3b66 DM	170
	171	#define FIB_RES_SADDR(net, res) \
	172	((FIB_RES_NH(res).nh_saddr_genid == \
	173	atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
	174	FIB_RES_NH(res).nh_saddr : \
	175	fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
1da177e4 LT	176	#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
	177	#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
	178	#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
	179
436c3b66 DM	180	#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
436c3b66 DM	181	FIB_RES_SADDR(net, res))
1fc050a1	182
1da177e4	183	struct fib_table {
8e773277 DM	184	struct hlist_node tb_hlist;
	185	u32 tb_id;
	186	int tb_default;
	187	int tb_num_default;
8e773277	188	unsigned long tb_data[0];
1da177e4 LT	189	};
1da177e4 LT	190
5c3a0fd7 JP	191	int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
	192	struct fib_result *res, int fib_flags);
	193	int fib_table_insert(struct fib_table , struct fib_config );
	194	int fib_table_delete(struct fib_table , struct fib_config );
	195	int fib_table_dump(struct fib_table table, struct sk_buff skb,
	196	struct netlink_callback *cb);
	197	int fib_table_flush(struct fib_table *table);
	198	void fib_free_table(struct fib_table *tb);
4aa2c466	199
16c6cf8b SH	200
16c6cf8b SH	201
1da177e4 LT	202	#ifndef CONFIG_IP_MULTIPLE_TABLES
1da177e4 LT	203
a5a519b2 AD	204	#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
a5a519b2 AD	205	#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
1da177e4	206
8ad4942c	207	static inline struct fib_table fib_get_table(struct net net, u32 id)
1da177e4	208	{
93456b6d DL	209	struct hlist_head *ptr;
	210
	211	ptr = id == RT_TABLE_LOCAL ?
e4aef8ae DL	212	&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
e4aef8ae DL	213	&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
93456b6d	214	return hlist_entry(ptr->first, struct fib_table, tb_hlist);
1da177e4 LT	215	}
1da177e4 LT	216
8ad4942c	217	static inline struct fib_table fib_new_table(struct net net, u32 id)
1da177e4	218	{
8ad4942c	219	return fib_get_table(net, id);
1da177e4 LT	220	}
1da177e4 LT	221
22bd5b9b	222	static inline int fib_lookup(struct net net, const struct flowi4 flp,
da0e28cb	223	struct fib_result *res)
1da177e4	224	{
345e9b54 AD	225	int err = -ENETUNREACH;
	226
	227	rcu_read_lock();
	228
	229	if (!fib_table_lookup(fib_get_table(net, RT_TABLE_LOCAL), flp, res,
	230	FIB_LOOKUP_NOREF) \|\|
	231	!fib_table_lookup(fib_get_table(net, RT_TABLE_MAIN), flp, res,
	232	FIB_LOOKUP_NOREF))
	233	err = 0;
93456b6d	234
345e9b54	235	rcu_read_unlock();
93456b6d	236
345e9b54	237	return err;
1da177e4 LT	238	}
1da177e4 LT	239
1da177e4	240	#else /* CONFIG_IP_MULTIPLE_TABLES */
5c3a0fd7 JP	241	int __net_init fib4_rules_init(struct net *net);
5c3a0fd7 JP	242	void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	243
5c3a0fd7 JP	244	struct fib_table fib_new_table(struct net net, u32 id);
5c3a0fd7 JP	245	struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	246
5c3a0fd7	247	int __fib_lookup(struct net net, struct flowi4 flp, struct fib_result *res);
f4530fa5 DM	248
	249	static inline int fib_lookup(struct net net, struct flowi4 flp,
	250	struct fib_result *res)
	251	{
	252	if (!net->ipv4.fib_has_custom_rules) {
345e9b54 AD	253	int err = -ENETUNREACH;
	254
	255	rcu_read_lock();
	256
85b91b03	257	res->tclassid = 0;
345e9b54 AD	258	if ((net->ipv4.fib_local &&
	259	!fib_table_lookup(net->ipv4.fib_local, flp, res,
	260	FIB_LOOKUP_NOREF)) \|\|
	261	(net->ipv4.fib_main &&
	262	!fib_table_lookup(net->ipv4.fib_main, flp, res,
	263	FIB_LOOKUP_NOREF)) \|\|
	264	(net->ipv4.fib_default &&
	265	!fib_table_lookup(net->ipv4.fib_default, flp, res,
	266	FIB_LOOKUP_NOREF)))
	267	err = 0;
	268
	269	rcu_read_unlock();
	270
	271	return err;
f4530fa5 DM	272	}
	273	return __fib_lookup(net, flp, res);
	274	}
	275
1da177e4 LT	276	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	277
	278	/* Exported by fib_frontend.c */
ef7c79ed	279	extern const struct nla_policy rtm_ipv4_policy[];
5c3a0fd7 JP	280	void ip_fib_init(void);
	281	__be32 fib_compute_spec_dst(struct sk_buff *skb);
	282	int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
	283	u8 tos, int oif, struct net_device *dev,
	284	struct in_device idev, u32 itag);
	285	void fib_select_default(struct fib_result *res);
7a9bc9b8	286	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	287	static inline int fib_num_tclassid_users(struct net *net)
	288	{
	289	return net->ipv4.fib_num_tclassid_users;
	290	}
7a9bc9b8	291	#else
f4530fa5 DM	292	static inline int fib_num_tclassid_users(struct net *net)
	293	{
	294	return 0;
	295	}
7a9bc9b8	296	#endif
14c85021	297
1da177e4	298	/* Exported by fib_semantics.c */
5c3a0fd7 JP	299	int ip_fib_check_default(__be32 gw, struct net_device *dev);
	300	int fib_sync_down_dev(struct net_device *dev, int force);
	301	int fib_sync_down_addr(struct net *net, __be32 local);
	302	int fib_sync_up(struct net_device *dev);
	303	void fib_select_multipath(struct fib_result *res);
1da177e4	304
5348ba85	305	/* Exported by fib_trie.c */
5c3a0fd7 JP	306	void fib_trie_init(void);
5c3a0fd7 JP	307	struct fib_table *fib_trie_table(u32 id);
1da177e4	308
b6bf3ca0	309	static inline void fib_combine_itag(u32 itag, const struct fib_result res)
1da177e4	310	{
c7066f70	311	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	312	#ifdef CONFIG_IP_MULTIPLE_TABLES
	313	u32 rtag;
	314	#endif
	315	itag = FIB_RES_NH(res).nh_tclassid<<16;
	316	#ifdef CONFIG_IP_MULTIPLE_TABLES
85b91b03	317	rtag = res->tclassid;
1da177e4 LT	318	if (*itag == 0)
	319	*itag = (rtag<<16);
	320	*itag \|= (rtag>>16);
	321	#endif
	322	#endif
	323	}
	324
5c3a0fd7	325	void free_fib_info(struct fib_info *fi);
1da177e4 LT	326
	327	static inline void fib_info_put(struct fib_info *fi)
	328	{
	329	if (atomic_dec_and_test(&fi->fib_clntref))
	330	free_fib_info(fi);
	331	}
	332
20380731	333	#ifdef CONFIG_PROC_FS
5c3a0fd7 JP	334	int __net_init fib_proc_init(struct net *net);
5c3a0fd7 JP	335	void __net_exit fib_proc_exit(struct net *net);
cc8274f5 LZ	336	#else
	337	static inline int fib_proc_init(struct net *net)
	338	{
	339	return 0;
	340	}
	341	static inline void fib_proc_exit(struct net *net)
	342	{
	343	}
20380731 ACM	344	#endif
20380731 ACM	345
1da177e4	346	#endif /* _NET_FIB_H */