[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 nlattr		*fc_encap;
	u16			fc_encap_type;
};

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 rcu_head			rcu;
};

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;
	atomic_t		nh_upper_bound;
#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;
	struct lwtunnel_state	*nh_lwtstate;
};

/*
 * 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_tb_id;
	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_weight;
#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_num_default;
	struct rcu_head		rcu;
	unsigned long 		*tb_data;
	unsigned long		__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);
struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
void fib_table_flush_external(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, unsigned int flags)
{
	struct fib_table *tb;
	int err = -ENETUNREACH;

	rcu_read_lock();

	tb = fib_get_table(net, RT_TABLE_MAIN);
	if (tb)
		err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);

	if (err == -EAGAIN)
		err = -ENETUNREACH;

	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, unsigned int flags);

static inline int fib_lookup(struct net *net, struct flowi4 *flp,
			     struct fib_result *res, unsigned int flags)
{
	struct fib_table *tb;
	int err = -ENETUNREACH;

	flags |= FIB_LOOKUP_NOREF;
	if (net->ipv4.fib_has_custom_rules)
		return __fib_lookup(net, flp, res, flags);

	rcu_read_lock();

	res->tclassid = 0;

	tb = rcu_dereference_rtnl(net->ipv4.fib_main);
	if (tb)
		err = fib_table_lookup(tb, flp, res, flags);

	if (!err)
		goto out;

	tb = rcu_dereference_rtnl(net->ipv4.fib_default);
	if (tb)
		err = fib_table_lookup(tb, flp, res, flags);

out:
	if (err == -EAGAIN)
		err = -ENETUNREACH;

	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(const struct flowi4 *flp, 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
int fib_unmerge(struct net *net);
void fib_flush_external(struct net *net);

/* 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, unsigned long event, bool force);
int fib_sync_down_addr(struct net_device *dev, __be32 local);
int fib_sync_up(struct net_device *dev, unsigned int nh_flags);

extern u32 fib_multipath_secret __read_mostly;

static inline int fib_multipath_hash(__be32 saddr, __be32 daddr)
{
	return jhash_2words((__force u32)saddr, (__force u32)daddr,
			    fib_multipath_secret) >> 1;
}

void fib_select_multipath(struct fib_result *res, int hash);
void fib_select_path(struct net *net, struct fib_result *res,
		     struct flowi4 *fl4, int mp_hash);

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

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;
4e902c57 TG	46	struct nl_info fc_nlinfo;
571e7226 RP	47	struct nlattr *fc_encap;
	48	u16 fc_encap_type;
	49	};
1da177e4 LT	50
1da177e4 LT	51	struct fib_info;
f2bb4bed	52	struct rtable;
1da177e4	53
4895c771 DM	54	struct fib_nh_exception {
4895c771 DM	55	struct fib_nh_exception __rcu *fnhe_next;
5aad1de5	56	int fnhe_genid;
4895c771 DM	57	__be32 fnhe_daddr;
4895c771 DM	58	u32 fnhe_pmtu;
aee06da6	59	__be32 fnhe_gw;
4895c771	60	unsigned long fnhe_expires;
2ffae99d TT	61	struct rtable __rcu *fnhe_rth_input;
2ffae99d TT	62	struct rtable __rcu *fnhe_rth_output;
4895c771	63	unsigned long fnhe_stamp;
deed49df	64	struct rcu_head rcu;
4895c771 DM	65	};
	66
	67	struct fnhe_hash_bucket {
	68	struct fib_nh_exception __rcu *chain;
	69	};
	70
d546c621 ED	71	#define FNHE_HASH_SHIFT 11
d546c621 ED	72	#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
4895c771 DM	73	#define FNHE_RECLAIM_DEPTH 5
4895c771 DM	74
1da177e4 LT	75	struct fib_nh {
	76	struct net_device *nh_dev;
	77	struct hlist_node nh_hash;
	78	struct fib_info *nh_parent;
95c96174	79	unsigned int nh_flags;
1da177e4 LT	80	unsigned char nh_scope;
	81	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	82	int nh_weight;
0e884c78	83	atomic_t nh_upper_bound;
1da177e4	84	#endif
c7066f70	85	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	86	__u32 nh_tclassid;
	87	#endif
	88	int nh_oif;
ed49e3ca	89	__be32 nh_gw;
1fc050a1	90	__be32 nh_saddr;
436c3b66	91	int nh_saddr_genid;
d26b3a7c	92	struct rtable __rcu * __percpu *nh_pcpu_rth_output;
54764bb6	93	struct rtable __rcu *nh_rth_input;
caa41527	94	struct fnhe_hash_bucket __rcu *nh_exceptions;
571e7226	95	struct lwtunnel_state *nh_lwtstate;
1da177e4 LT	96	};
	97
	98	/*
	99	* This structure contains data shared by many of routes.
	100	*/
	101
	102	struct fib_info {
	103	struct hlist_node fib_hash;
	104	struct hlist_node fib_lhash;
7462bd74	105	struct net *fib_net;
1da177e4 LT	106	int fib_treeref;
1da177e4 LT	107	atomic_t fib_clntref;
95c96174	108	unsigned int fib_flags;
37e826c5 DM	109	unsigned char fib_dead;
	110	unsigned char fib_protocol;
	111	unsigned char fib_scope;
f4ef85bb	112	unsigned char fib_type;
b83738ae	113	__be32 fib_prefsrc;
5a56a0b3	114	u32 fib_tb_id;
1da177e4	115	u32 fib_priority;
9c150e82	116	u32 *fib_metrics;
1da177e4 LT	117	#define fib_mtu fib_metrics[RTAX_MTU-1]
	118	#define fib_window fib_metrics[RTAX_WINDOW-1]
	119	#define fib_rtt fib_metrics[RTAX_RTT-1]
	120	#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
	121	int fib_nhs;
	122	#ifdef CONFIG_IP_ROUTE_MULTIPATH
0e884c78	123	int fib_weight;
1da177e4	124	#endif
ebc0ffae	125	struct rcu_head rcu;
1da177e4 LT	126	struct fib_nh fib_nh[0];
	127	#define fib_dev fib_nh[0].nh_dev
	128	};
	129
	130
	131	#ifdef CONFIG_IP_MULTIPLE_TABLES
	132	struct fib_rule;
	133	#endif
	134
5b470441	135	struct fib_table;
1da177e4 LT	136	struct fib_result {
	137	unsigned char prefixlen;
	138	unsigned char nh_sel;
	139	unsigned char type;
	140	unsigned char scope;
85b91b03	141	u32 tclassid;
1da177e4	142	struct fib_info *fi;
5b470441	143	struct fib_table *table;
56315f9e	144	struct hlist_head *fa_head;
1da177e4 LT	145	};
1da177e4 LT	146
246955fe	147	struct fib_result_nl {
80e856e1	148	__be32 fl_addr; /* To be looked up*/
5f300893	149	u32 fl_mark;
246955fe RO	150	unsigned char fl_tos;
	151	unsigned char fl_scope;
	152	unsigned char tb_id_in;
	153
	154	unsigned char tb_id; /* Results */
	155	unsigned char prefixlen;
	156	unsigned char nh_sel;
	157	unsigned char type;
	158	unsigned char scope;
	159	int err;
	160	};
1da177e4 LT	161
1da177e4 LT	162	#ifdef CONFIG_IP_ROUTE_MULTIPATH
1da177e4	163	#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
1da177e4	164	#else /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	165	#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
5b9e12db	166	#endif /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	167
5b9e12db	168	#ifdef CONFIG_IP_MULTIPLE_TABLES
93456b6d	169	#define FIB_TABLE_HASHSZ 256
5b9e12db DL	170	#else
	171	#define FIB_TABLE_HASHSZ 2
	172	#endif
1da177e4	173
5c3a0fd7	174	__be32 fib_info_update_nh_saddr(struct net net, struct fib_nh nh);
436c3b66 DM	175
	176	#define FIB_RES_SADDR(net, res) \
	177	((FIB_RES_NH(res).nh_saddr_genid == \
	178	atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
	179	FIB_RES_NH(res).nh_saddr : \
	180	fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
1da177e4 LT	181	#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
	182	#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
	183	#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
	184
436c3b66 DM	185	#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
436c3b66 DM	186	FIB_RES_SADDR(net, res))
1fc050a1	187
1da177e4	188	struct fib_table {
8e773277 DM	189	struct hlist_node tb_hlist;
8e773277 DM	190	u32 tb_id;
8e773277	191	int tb_num_default;
a7e53531	192	struct rcu_head rcu;
0ddcf43d AD	193	unsigned long *tb_data;
0ddcf43d AD	194	unsigned long __data[0];
1da177e4 LT	195	};
1da177e4 LT	196
5c3a0fd7 JP	197	int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
	198	struct fib_result *res, int fib_flags);
	199	int fib_table_insert(struct fib_table , struct fib_config );
	200	int fib_table_delete(struct fib_table , struct fib_config );
	201	int fib_table_dump(struct fib_table table, struct sk_buff skb,
	202	struct netlink_callback *cb);
	203	int fib_table_flush(struct fib_table *table);
0ddcf43d	204	struct fib_table fib_trie_unmerge(struct fib_table main_tb);
104616e7	205	void fib_table_flush_external(struct fib_table *table);
5c3a0fd7	206	void fib_free_table(struct fib_table *tb);
4aa2c466	207
1da177e4 LT	208	#ifndef CONFIG_IP_MULTIPLE_TABLES
1da177e4 LT	209
a5a519b2 AD	210	#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
a5a519b2 AD	211	#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
1da177e4	212
8ad4942c	213	static inline struct fib_table fib_get_table(struct net net, u32 id)
1da177e4	214	{
a7e53531	215	struct hlist_node *tb_hlist;
93456b6d DL	216	struct hlist_head *ptr;
	217
	218	ptr = id == RT_TABLE_LOCAL ?
e4aef8ae DL	219	&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
e4aef8ae DL	220	&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
a7e53531 AD	221
	222	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
	223
	224	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
1da177e4 LT	225	}
1da177e4 LT	226
8ad4942c	227	static inline struct fib_table fib_new_table(struct net net, u32 id)
1da177e4	228	{
8ad4942c	229	return fib_get_table(net, id);
1da177e4 LT	230	}
1da177e4 LT	231
22bd5b9b	232	static inline int fib_lookup(struct net net, const struct flowi4 flp,
0eeb075f	233	struct fib_result *res, unsigned int flags)
1da177e4	234	{
a7e53531	235	struct fib_table *tb;
0ddcf43d	236	int err = -ENETUNREACH;
345e9b54 AD	237
	238	rcu_read_lock();
	239
0ddcf43d	240	tb = fib_get_table(net, RT_TABLE_MAIN);
0315e382 NF	241	if (tb)
	242	err = fib_table_lookup(tb, flp, res, flags \| FIB_LOOKUP_NOREF);
	243
	244	if (err == -EAGAIN)
	245	err = -ENETUNREACH;
93456b6d	246
345e9b54	247	rcu_read_unlock();
93456b6d	248
345e9b54	249	return err;
1da177e4 LT	250	}
1da177e4 LT	251
1da177e4	252	#else /* CONFIG_IP_MULTIPLE_TABLES */
5c3a0fd7 JP	253	int __net_init fib4_rules_init(struct net *net);
5c3a0fd7 JP	254	void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	255
5c3a0fd7 JP	256	struct fib_table fib_new_table(struct net net, u32 id);
5c3a0fd7 JP	257	struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	258
0eeb075f AG	259	int __fib_lookup(struct net net, struct flowi4 flp,
0eeb075f AG	260	struct fib_result *res, unsigned int flags);
f4530fa5 DM	261
f4530fa5 DM	262	static inline int fib_lookup(struct net net, struct flowi4 flp,
0eeb075f	263	struct fib_result *res, unsigned int flags)
f4530fa5	264	{
a7e53531	265	struct fib_table *tb;
0315e382	266	int err = -ENETUNREACH;
a7e53531	267
0eeb075f	268	flags \|= FIB_LOOKUP_NOREF;
a7e53531	269	if (net->ipv4.fib_has_custom_rules)
0eeb075f	270	return __fib_lookup(net, flp, res, flags);
a7e53531 AD	271
	272	rcu_read_lock();
	273
	274	res->tclassid = 0;
	275
0315e382 NF	276	tb = rcu_dereference_rtnl(net->ipv4.fib_main);
	277	if (tb)
	278	err = fib_table_lookup(tb, flp, res, flags);
	279
	280	if (!err)
	281	goto out;
	282
	283	tb = rcu_dereference_rtnl(net->ipv4.fib_default);
	284	if (tb)
	285	err = fib_table_lookup(tb, flp, res, flags);
a7e53531	286
0315e382 NF	287	out:
	288	if (err == -EAGAIN)
	289	err = -ENETUNREACH;
a7e53531 AD	290
	291	rcu_read_unlock();
	292
	293	return err;
f4530fa5 DM	294	}
f4530fa5 DM	295
1da177e4 LT	296	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	297
	298	/* Exported by fib_frontend.c */
ef7c79ed	299	extern const struct nla_policy rtm_ipv4_policy[];
5c3a0fd7 JP	300	void ip_fib_init(void);
	301	__be32 fib_compute_spec_dst(struct sk_buff *skb);
	302	int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
	303	u8 tos, int oif, struct net_device *dev,
	304	struct in_device idev, u32 itag);
2392debc	305	void fib_select_default(const struct flowi4 flp, struct fib_result res);
7a9bc9b8	306	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	307	static inline int fib_num_tclassid_users(struct net *net)
	308	{
	309	return net->ipv4.fib_num_tclassid_users;
	310	}
7a9bc9b8	311	#else
f4530fa5 DM	312	static inline int fib_num_tclassid_users(struct net *net)
	313	{
	314	return 0;
	315	}
7a9bc9b8	316	#endif
0ddcf43d	317	int fib_unmerge(struct net *net);
104616e7	318	void fib_flush_external(struct net *net);
14c85021	319
1da177e4	320	/* Exported by fib_semantics.c */
5c3a0fd7	321	int ip_fib_check_default(__be32 gw, struct net_device *dev);
4f823def	322	int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
5a56a0b3	323	int fib_sync_down_addr(struct net_device *dev, __be32 local);
8a3d0316	324	int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
0e884c78 PN	325
	326	extern u32 fib_multipath_secret __read_mostly;
	327
	328	static inline int fib_multipath_hash(__be32 saddr, __be32 daddr)
	329	{
0797cbd8 LR	330	return jhash_2words((__force u32)saddr, (__force u32)daddr,
0797cbd8 LR	331	fib_multipath_secret) >> 1;
0e884c78 PN	332	}
	333
	334	void fib_select_multipath(struct fib_result *res, int hash);
3ce58d84 DA	335	void fib_select_path(struct net net, struct fib_result res,
3ce58d84 DA	336	struct flowi4 *fl4, int mp_hash);
1da177e4	337
5348ba85	338	/* Exported by fib_trie.c */
5c3a0fd7	339	void fib_trie_init(void);
0ddcf43d	340	struct fib_table fib_trie_table(u32 id, struct fib_table alias);
1da177e4	341
b6bf3ca0	342	static inline void fib_combine_itag(u32 itag, const struct fib_result res)
1da177e4	343	{
c7066f70	344	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	345	#ifdef CONFIG_IP_MULTIPLE_TABLES
	346	u32 rtag;
	347	#endif
	348	itag = FIB_RES_NH(res).nh_tclassid<<16;
	349	#ifdef CONFIG_IP_MULTIPLE_TABLES
85b91b03	350	rtag = res->tclassid;
1da177e4 LT	351	if (*itag == 0)
	352	*itag = (rtag<<16);
	353	*itag \|= (rtag>>16);
	354	#endif
	355	#endif
	356	}
	357
5c3a0fd7	358	void free_fib_info(struct fib_info *fi);
1da177e4 LT	359
	360	static inline void fib_info_put(struct fib_info *fi)
	361	{
	362	if (atomic_dec_and_test(&fi->fib_clntref))
	363	free_fib_info(fi);
	364	}
	365
20380731	366	#ifdef CONFIG_PROC_FS
5c3a0fd7 JP	367	int __net_init fib_proc_init(struct net *net);
5c3a0fd7 JP	368	void __net_exit fib_proc_exit(struct net *net);
cc8274f5 LZ	369	#else
	370	static inline int fib_proc_init(struct net *net)
	371	{
	372	return 0;
	373	}
	374	static inline void fib_proc_exit(struct net *net)
	375	{
	376	}
20380731 ACM	377	#endif
20380731 ACM	378
1da177e4	379	#endif /* _NET_FIB_H */