[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, <[email protected]>
 *
 *		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 hlist_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;
	struct rcu_head		rcu;
	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_node *tb_hlist;
	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];

	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));

	return hlist_entry(tb_hlist, 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 *tb;
	int err;

	rcu_read_lock();

	for (err = 0; !err; err = -ENETUNREACH) {
		tb = fib_get_table(net, RT_TABLE_LOCAL);
		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
			break;
		tb = fib_get_table(net, RT_TABLE_MAIN);
		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
			break;
	}

	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)
{
	struct fib_table *tb;
	int err;

	if (net->ipv4.fib_has_custom_rules)
		return __fib_lookup(net, flp, res);

	rcu_read_lock();

	res->tclassid = 0;

	for (err = 0; !err; err = -ENETUNREACH) {
		tb = rcu_dereference_rtnl(net->ipv4.fib_local);
		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
			break;

		tb = rcu_dereference_rtnl(net->ipv4.fib_main);
		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
			break;

		tb = rcu_dereference_rtnl(net->ipv4.fib_default);
		if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
			break;
	}

	rcu_read_unlock();

	return err;
}

#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, <[email protected]>
	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	138	struct fib_table *table;
56315f9e	139	struct hlist_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;
a7e53531	188	struct rcu_head rcu;
8e773277	189	unsigned long tb_data[0];
1da177e4 LT	190	};
1da177e4 LT	191
5c3a0fd7 JP	192	int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
	193	struct fib_result *res, int fib_flags);
	194	int fib_table_insert(struct fib_table , struct fib_config );
	195	int fib_table_delete(struct fib_table , struct fib_config );
	196	int fib_table_dump(struct fib_table table, struct sk_buff skb,
	197	struct netlink_callback *cb);
	198	int fib_table_flush(struct fib_table *table);
	199	void fib_free_table(struct fib_table *tb);
4aa2c466	200
16c6cf8b SH	201
16c6cf8b SH	202
1da177e4 LT	203	#ifndef CONFIG_IP_MULTIPLE_TABLES
1da177e4 LT	204
a5a519b2 AD	205	#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
a5a519b2 AD	206	#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
1da177e4	207
8ad4942c	208	static inline struct fib_table fib_get_table(struct net net, u32 id)
1da177e4	209	{
a7e53531	210	struct hlist_node *tb_hlist;
93456b6d DL	211	struct hlist_head *ptr;
	212
	213	ptr = id == RT_TABLE_LOCAL ?
e4aef8ae DL	214	&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
e4aef8ae DL	215	&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
a7e53531 AD	216
	217	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
	218
	219	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
1da177e4 LT	220	}
1da177e4 LT	221
8ad4942c	222	static inline struct fib_table fib_new_table(struct net net, u32 id)
1da177e4	223	{
8ad4942c	224	return fib_get_table(net, id);
1da177e4 LT	225	}
1da177e4 LT	226
22bd5b9b	227	static inline int fib_lookup(struct net net, const struct flowi4 flp,
da0e28cb	228	struct fib_result *res)
1da177e4	229	{
a7e53531 AD	230	struct fib_table *tb;
a7e53531 AD	231	int err;
345e9b54 AD	232
	233	rcu_read_lock();
	234
a7e53531 AD	235	for (err = 0; !err; err = -ENETUNREACH) {
	236	tb = fib_get_table(net, RT_TABLE_LOCAL);
	237	if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
	238	break;
	239	tb = fib_get_table(net, RT_TABLE_MAIN);
	240	if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
	241	break;
	242	}
93456b6d	243
345e9b54	244	rcu_read_unlock();
93456b6d	245
345e9b54	246	return err;
1da177e4 LT	247	}
1da177e4 LT	248
1da177e4	249	#else /* CONFIG_IP_MULTIPLE_TABLES */
5c3a0fd7 JP	250	int __net_init fib4_rules_init(struct net *net);
5c3a0fd7 JP	251	void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	252
5c3a0fd7 JP	253	struct fib_table fib_new_table(struct net net, u32 id);
5c3a0fd7 JP	254	struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	255
5c3a0fd7	256	int __fib_lookup(struct net net, struct flowi4 flp, struct fib_result *res);
f4530fa5 DM	257
	258	static inline int fib_lookup(struct net net, struct flowi4 flp,
	259	struct fib_result *res)
	260	{
a7e53531 AD	261	struct fib_table *tb;
	262	int err;
	263
	264	if (net->ipv4.fib_has_custom_rules)
	265	return __fib_lookup(net, flp, res);
	266
	267	rcu_read_lock();
	268
	269	res->tclassid = 0;
	270
	271	for (err = 0; !err; err = -ENETUNREACH) {
	272	tb = rcu_dereference_rtnl(net->ipv4.fib_local);
	273	if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
	274	break;
	275
	276	tb = rcu_dereference_rtnl(net->ipv4.fib_main);
	277	if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
	278	break;
	279
	280	tb = rcu_dereference_rtnl(net->ipv4.fib_default);
	281	if (tb && !fib_table_lookup(tb, flp, res, FIB_LOOKUP_NOREF))
	282	break;
f4530fa5	283	}
a7e53531 AD	284
	285	rcu_read_unlock();
	286
	287	return err;
f4530fa5 DM	288	}
f4530fa5 DM	289
1da177e4 LT	290	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	291
	292	/* Exported by fib_frontend.c */
ef7c79ed	293	extern const struct nla_policy rtm_ipv4_policy[];
5c3a0fd7 JP	294	void ip_fib_init(void);
	295	__be32 fib_compute_spec_dst(struct sk_buff *skb);
	296	int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
	297	u8 tos, int oif, struct net_device *dev,
	298	struct in_device idev, u32 itag);
	299	void fib_select_default(struct fib_result *res);
7a9bc9b8	300	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	301	static inline int fib_num_tclassid_users(struct net *net)
	302	{
	303	return net->ipv4.fib_num_tclassid_users;
	304	}
7a9bc9b8	305	#else
f4530fa5 DM	306	static inline int fib_num_tclassid_users(struct net *net)
	307	{
	308	return 0;
	309	}
7a9bc9b8	310	#endif
14c85021	311
1da177e4	312	/* Exported by fib_semantics.c */
5c3a0fd7 JP	313	int ip_fib_check_default(__be32 gw, struct net_device *dev);
	314	int fib_sync_down_dev(struct net_device *dev, int force);
	315	int fib_sync_down_addr(struct net *net, __be32 local);
	316	int fib_sync_up(struct net_device *dev);
	317	void fib_select_multipath(struct fib_result *res);
1da177e4	318
5348ba85	319	/* Exported by fib_trie.c */
5c3a0fd7 JP	320	void fib_trie_init(void);
5c3a0fd7 JP	321	struct fib_table *fib_trie_table(u32 id);
1da177e4	322
b6bf3ca0	323	static inline void fib_combine_itag(u32 itag, const struct fib_result res)
1da177e4	324	{
c7066f70	325	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	326	#ifdef CONFIG_IP_MULTIPLE_TABLES
	327	u32 rtag;
	328	#endif
	329	itag = FIB_RES_NH(res).nh_tclassid<<16;
	330	#ifdef CONFIG_IP_MULTIPLE_TABLES
85b91b03	331	rtag = res->tclassid;
1da177e4 LT	332	if (*itag == 0)
	333	*itag = (rtag<<16);
	334	*itag \|= (rtag>>16);
	335	#endif
	336	#endif
	337	}
	338
5c3a0fd7	339	void free_fib_info(struct fib_info *fi);
1da177e4 LT	340
	341	static inline void fib_info_put(struct fib_info *fi)
	342	{
	343	if (atomic_dec_and_test(&fi->fib_clntref))
	344	free_fib_info(fi);
	345	}
	346
20380731	347	#ifdef CONFIG_PROC_FS
5c3a0fd7 JP	348	int __net_init fib_proc_init(struct net *net);
5c3a0fd7 JP	349	void __net_exit fib_proc_exit(struct net *net);
cc8274f5 LZ	350	#else
	351	static inline int fib_proc_init(struct net *net)
	352	{
	353	return 0;
	354	}
	355	static inline void fib_proc_exit(struct net *net)
	356	{
	357	}
20380731 ACM	358	#endif
20380731 ACM	359
1da177e4	360	#endif /* _NET_FIB_H */