[mirror_ubuntu-jammy-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>
#include <linux/notifier.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
	unsigned int		fib_offload_cnt;
	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);

static inline void fib_info_offload_inc(struct fib_info *fi)
{
	fi->fib_offload_cnt++;
	fi->fib_flags |= RTNH_F_OFFLOAD;
}

static inline void fib_info_offload_dec(struct fib_info *fi)
{
	if (--fi->fib_offload_cnt == 0)
		fi->fib_flags &= ~RTNH_F_OFFLOAD;
}

#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_notifier_info {
	struct net *net;
};

struct fib_entry_notifier_info {
	struct fib_notifier_info info; /* must be first */
	u32 dst;
	int dst_len;
	struct fib_info *fi;
	u8 tos;
	u8 type;
	u32 tb_id;
};

struct fib_nh_notifier_info {
	struct fib_notifier_info info; /* must be first */
	struct fib_nh *fib_nh;
};

enum fib_event_type {
	FIB_EVENT_ENTRY_REPLACE,
	FIB_EVENT_ENTRY_APPEND,
	FIB_EVENT_ENTRY_ADD,
	FIB_EVENT_ENTRY_DEL,
	FIB_EVENT_RULE_ADD,
	FIB_EVENT_RULE_DEL,
	FIB_EVENT_NH_ADD,
	FIB_EVENT_NH_DEL,
};

int register_fib_notifier(struct notifier_block *nb,
			  void (*cb)(struct notifier_block *nb));
int unregister_fib_notifier(struct notifier_block *nb);
int call_fib_notifier(struct notifier_block *nb, struct net *net,
		      enum fib_event_type event_type,
		      struct fib_notifier_info *info);
int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
		       struct fib_notifier_info *info);

void fib_notify(struct net *net, struct notifier_block *nb);
#ifdef CONFIG_IP_MULTIPLE_TABLES
void fib_rules_notify(struct net *net, struct notifier_block *nb);
#else
static inline void fib_rules_notify(struct net *net, struct notifier_block *nb)
{
}
#endif

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 net *, struct fib_table *, struct fib_config *);
int fib_table_delete(struct net *, 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 net *net, 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);
#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);

/* 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_hold(struct fib_info *fi)
{
	atomic_inc(&fi->fib_clntref);
}

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>
b90eb754	25	#include <linux/notifier.h>
1da177e4	26
4e902c57	27	struct fib_config {
4e902c57	28	u8 fc_dst_len;
4e902c57 TG	29	u8 fc_tos;
	30	u8 fc_protocol;
	31	u8 fc_scope;
	32	u8 fc_type;
b52f070c	33	/* 3 bytes unused */
4e902c57	34	u32 fc_table;
6d85c10a	35	__be32 fc_dst;
6d85c10a	36	__be32 fc_gw;
4e902c57 TG	37	int fc_oif;
	38	u32 fc_flags;
	39	u32 fc_priority;
6d85c10a	40	__be32 fc_prefsrc;
4e902c57 TG	41	struct nlattr *fc_mx;
	42	struct rtnexthop *fc_mp;
	43	int fc_mx_len;
	44	int fc_mp_len;
	45	u32 fc_flow;
4e902c57 TG	46	u32 fc_nlflags;
4e902c57 TG	47	struct nl_info fc_nlinfo;
571e7226 RP	48	struct nlattr *fc_encap;
	49	u16 fc_encap_type;
	50	};
1da177e4 LT	51
1da177e4 LT	52	struct fib_info;
f2bb4bed	53	struct rtable;
1da177e4	54
4895c771 DM	55	struct fib_nh_exception {
4895c771 DM	56	struct fib_nh_exception __rcu *fnhe_next;
5aad1de5	57	int fnhe_genid;
4895c771 DM	58	__be32 fnhe_daddr;
4895c771 DM	59	u32 fnhe_pmtu;
aee06da6	60	__be32 fnhe_gw;
4895c771	61	unsigned long fnhe_expires;
2ffae99d TT	62	struct rtable __rcu *fnhe_rth_input;
2ffae99d TT	63	struct rtable __rcu *fnhe_rth_output;
4895c771	64	unsigned long fnhe_stamp;
deed49df	65	struct rcu_head rcu;
4895c771 DM	66	};
	67
	68	struct fnhe_hash_bucket {
	69	struct fib_nh_exception __rcu *chain;
	70	};
	71
d546c621 ED	72	#define FNHE_HASH_SHIFT 11
d546c621 ED	73	#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
4895c771 DM	74	#define FNHE_RECLAIM_DEPTH 5
4895c771 DM	75
1da177e4 LT	76	struct fib_nh {
	77	struct net_device *nh_dev;
	78	struct hlist_node nh_hash;
	79	struct fib_info *nh_parent;
95c96174	80	unsigned int nh_flags;
1da177e4 LT	81	unsigned char nh_scope;
	82	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	83	int nh_weight;
0e884c78	84	atomic_t nh_upper_bound;
1da177e4	85	#endif
c7066f70	86	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	87	__u32 nh_tclassid;
	88	#endif
	89	int nh_oif;
ed49e3ca	90	__be32 nh_gw;
1fc050a1	91	__be32 nh_saddr;
436c3b66	92	int nh_saddr_genid;
d26b3a7c	93	struct rtable __rcu * __percpu *nh_pcpu_rth_output;
54764bb6	94	struct rtable __rcu *nh_rth_input;
caa41527	95	struct fnhe_hash_bucket __rcu *nh_exceptions;
571e7226	96	struct lwtunnel_state *nh_lwtstate;
1da177e4 LT	97	};
	98
	99	/*
	100	* This structure contains data shared by many of routes.
	101	*/
	102
	103	struct fib_info {
	104	struct hlist_node fib_hash;
	105	struct hlist_node fib_lhash;
7462bd74	106	struct net *fib_net;
1da177e4 LT	107	int fib_treeref;
1da177e4 LT	108	atomic_t fib_clntref;
95c96174	109	unsigned int fib_flags;
37e826c5 DM	110	unsigned char fib_dead;
	111	unsigned char fib_protocol;
	112	unsigned char fib_scope;
f4ef85bb	113	unsigned char fib_type;
b83738ae	114	__be32 fib_prefsrc;
5a56a0b3	115	u32 fib_tb_id;
1da177e4	116	u32 fib_priority;
9c150e82	117	u32 *fib_metrics;
1da177e4 LT	118	#define fib_mtu fib_metrics[RTAX_MTU-1]
	119	#define fib_window fib_metrics[RTAX_WINDOW-1]
	120	#define fib_rtt fib_metrics[RTAX_RTT-1]
	121	#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
	122	int fib_nhs;
	123	#ifdef CONFIG_IP_ROUTE_MULTIPATH
0e884c78	124	int fib_weight;
1da177e4	125	#endif
c9850187	126	unsigned int fib_offload_cnt;
ebc0ffae	127	struct rcu_head rcu;
1da177e4 LT	128	struct fib_nh fib_nh[0];
	129	#define fib_dev fib_nh[0].nh_dev
	130	};
	131
	132
	133	#ifdef CONFIG_IP_MULTIPLE_TABLES
	134	struct fib_rule;
	135	#endif
	136
5b470441	137	struct fib_table;
1da177e4 LT	138	struct fib_result {
	139	unsigned char prefixlen;
	140	unsigned char nh_sel;
	141	unsigned char type;
	142	unsigned char scope;
85b91b03	143	u32 tclassid;
1da177e4	144	struct fib_info *fi;
5b470441	145	struct fib_table *table;
56315f9e	146	struct hlist_head *fa_head;
1da177e4 LT	147	};
1da177e4 LT	148
246955fe	149	struct fib_result_nl {
80e856e1	150	__be32 fl_addr; /* To be looked up*/
5f300893	151	u32 fl_mark;
246955fe RO	152	unsigned char fl_tos;
	153	unsigned char fl_scope;
	154	unsigned char tb_id_in;
	155
	156	unsigned char tb_id; /* Results */
	157	unsigned char prefixlen;
	158	unsigned char nh_sel;
	159	unsigned char type;
	160	unsigned char scope;
	161	int err;
	162	};
1da177e4 LT	163
1da177e4 LT	164	#ifdef CONFIG_IP_ROUTE_MULTIPATH
1da177e4	165	#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
1da177e4	166	#else /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	167	#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
5b9e12db	168	#endif /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	169
5b9e12db	170	#ifdef CONFIG_IP_MULTIPLE_TABLES
93456b6d	171	#define FIB_TABLE_HASHSZ 256
5b9e12db DL	172	#else
	173	#define FIB_TABLE_HASHSZ 2
	174	#endif
1da177e4	175
5c3a0fd7	176	__be32 fib_info_update_nh_saddr(struct net net, struct fib_nh nh);
436c3b66	177
c9850187 JP	178	static inline void fib_info_offload_inc(struct fib_info *fi)
	179	{
	180	fi->fib_offload_cnt++;
	181	fi->fib_flags \|= RTNH_F_OFFLOAD;
	182	}
	183
	184	static inline void fib_info_offload_dec(struct fib_info *fi)
	185	{
	186	if (--fi->fib_offload_cnt == 0)
	187	fi->fib_flags &= ~RTNH_F_OFFLOAD;
	188	}
	189
436c3b66 DM	190	#define FIB_RES_SADDR(net, res) \
	191	((FIB_RES_NH(res).nh_saddr_genid == \
	192	atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
	193	FIB_RES_NH(res).nh_saddr : \
	194	fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
1da177e4 LT	195	#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
	196	#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
	197	#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
	198
436c3b66 DM	199	#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
436c3b66 DM	200	FIB_RES_SADDR(net, res))
1fc050a1	201
b90eb754 JP	202	struct fib_notifier_info {
	203	struct net *net;
	204	};
	205
	206	struct fib_entry_notifier_info {
	207	struct fib_notifier_info info; /* must be first */
	208	u32 dst;
	209	int dst_len;
	210	struct fib_info *fi;
	211	u8 tos;
	212	u8 type;
	213	u32 tb_id;
b90eb754 JP	214	};
b90eb754 JP	215
982acb97 IS	216	struct fib_nh_notifier_info {
	217	struct fib_notifier_info info; /* must be first */
	218	struct fib_nh *fib_nh;
	219	};
	220
b90eb754	221	enum fib_event_type {
2f3a5272 IS	222	FIB_EVENT_ENTRY_REPLACE,
2f3a5272 IS	223	FIB_EVENT_ENTRY_APPEND,
b90eb754 JP	224	FIB_EVENT_ENTRY_ADD,
	225	FIB_EVENT_ENTRY_DEL,
	226	FIB_EVENT_RULE_ADD,
	227	FIB_EVENT_RULE_DEL,
982acb97 IS	228	FIB_EVENT_NH_ADD,
982acb97 IS	229	FIB_EVENT_NH_DEL,
b90eb754 JP	230	};
b90eb754 JP	231
c3852ef7 IS	232	int register_fib_notifier(struct notifier_block *nb,
c3852ef7 IS	233	void (cb)(struct notifier_block nb));
b90eb754	234	int unregister_fib_notifier(struct notifier_block *nb);
c0243892 IS	235	int call_fib_notifier(struct notifier_block nb, struct net net,
	236	enum fib_event_type event_type,
	237	struct fib_notifier_info *info);
b90eb754 JP	238	int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
	239	struct fib_notifier_info *info);
	240
d05f7a7d	241	void fib_notify(struct net net, struct notifier_block nb);
c0243892	242	#ifdef CONFIG_IP_MULTIPLE_TABLES
d05f7a7d	243	void fib_rules_notify(struct net net, struct notifier_block nb);
c0243892	244	#else
d05f7a7d	245	static inline void fib_rules_notify(struct net net, struct notifier_block nb)
c0243892 IS	246	{
	247	}
	248	#endif
	249
1da177e4	250	struct fib_table {
8e773277 DM	251	struct hlist_node tb_hlist;
8e773277 DM	252	u32 tb_id;
8e773277	253	int tb_num_default;
a7e53531	254	struct rcu_head rcu;
0ddcf43d AD	255	unsigned long *tb_data;
0ddcf43d AD	256	unsigned long __data[0];
1da177e4 LT	257	};
1da177e4 LT	258
5c3a0fd7 JP	259	int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
5c3a0fd7 JP	260	struct fib_result *res, int fib_flags);
b90eb754 JP	261	int fib_table_insert(struct net , struct fib_table , struct fib_config *);
b90eb754 JP	262	int fib_table_delete(struct net , struct fib_table , struct fib_config *);
5c3a0fd7 JP	263	int fib_table_dump(struct fib_table table, struct sk_buff skb,
5c3a0fd7 JP	264	struct netlink_callback *cb);
b90eb754	265	int fib_table_flush(struct net net, struct fib_table table);
0ddcf43d	266	struct fib_table fib_trie_unmerge(struct fib_table main_tb);
3b709334	267	void fib_table_flush_external(struct fib_table *table);
5c3a0fd7	268	void fib_free_table(struct fib_table *tb);
4aa2c466	269
1da177e4 LT	270	#ifndef CONFIG_IP_MULTIPLE_TABLES
1da177e4 LT	271
a5a519b2 AD	272	#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
a5a519b2 AD	273	#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
1da177e4	274
8ad4942c	275	static inline struct fib_table fib_get_table(struct net net, u32 id)
1da177e4	276	{
a7e53531	277	struct hlist_node *tb_hlist;
93456b6d DL	278	struct hlist_head *ptr;
	279
	280	ptr = id == RT_TABLE_LOCAL ?
e4aef8ae DL	281	&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
e4aef8ae DL	282	&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
a7e53531 AD	283
	284	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
	285
	286	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
1da177e4 LT	287	}
1da177e4 LT	288
8ad4942c	289	static inline struct fib_table fib_new_table(struct net net, u32 id)
1da177e4	290	{
8ad4942c	291	return fib_get_table(net, id);
1da177e4 LT	292	}
1da177e4 LT	293
22bd5b9b	294	static inline int fib_lookup(struct net net, const struct flowi4 flp,
0eeb075f	295	struct fib_result *res, unsigned int flags)
1da177e4	296	{
a7e53531	297	struct fib_table *tb;
0ddcf43d	298	int err = -ENETUNREACH;
345e9b54 AD	299
	300	rcu_read_lock();
	301
0ddcf43d	302	tb = fib_get_table(net, RT_TABLE_MAIN);
0315e382 NF	303	if (tb)
	304	err = fib_table_lookup(tb, flp, res, flags \| FIB_LOOKUP_NOREF);
	305
	306	if (err == -EAGAIN)
	307	err = -ENETUNREACH;
93456b6d	308
345e9b54	309	rcu_read_unlock();
93456b6d	310
345e9b54	311	return err;
1da177e4 LT	312	}
1da177e4 LT	313
1da177e4	314	#else /* CONFIG_IP_MULTIPLE_TABLES */
5c3a0fd7 JP	315	int __net_init fib4_rules_init(struct net *net);
5c3a0fd7 JP	316	void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	317
5c3a0fd7 JP	318	struct fib_table fib_new_table(struct net net, u32 id);
5c3a0fd7 JP	319	struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	320
0eeb075f AG	321	int __fib_lookup(struct net net, struct flowi4 flp,
0eeb075f AG	322	struct fib_result *res, unsigned int flags);
f4530fa5 DM	323
f4530fa5 DM	324	static inline int fib_lookup(struct net net, struct flowi4 flp,
0eeb075f	325	struct fib_result *res, unsigned int flags)
f4530fa5	326	{
a7e53531	327	struct fib_table *tb;
0315e382	328	int err = -ENETUNREACH;
a7e53531	329
0eeb075f	330	flags \|= FIB_LOOKUP_NOREF;
a7e53531	331	if (net->ipv4.fib_has_custom_rules)
0eeb075f	332	return __fib_lookup(net, flp, res, flags);
a7e53531 AD	333
	334	rcu_read_lock();
	335
	336	res->tclassid = 0;
	337
0315e382 NF	338	tb = rcu_dereference_rtnl(net->ipv4.fib_main);
	339	if (tb)
	340	err = fib_table_lookup(tb, flp, res, flags);
	341
	342	if (!err)
	343	goto out;
	344
	345	tb = rcu_dereference_rtnl(net->ipv4.fib_default);
	346	if (tb)
	347	err = fib_table_lookup(tb, flp, res, flags);
a7e53531	348
0315e382 NF	349	out:
	350	if (err == -EAGAIN)
	351	err = -ENETUNREACH;
a7e53531 AD	352
	353	rcu_read_unlock();
	354
	355	return err;
f4530fa5 DM	356	}
f4530fa5 DM	357
1da177e4 LT	358	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	359
	360	/* Exported by fib_frontend.c */
ef7c79ed	361	extern const struct nla_policy rtm_ipv4_policy[];
5c3a0fd7 JP	362	void ip_fib_init(void);
	363	__be32 fib_compute_spec_dst(struct sk_buff *skb);
	364	int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
	365	u8 tos, int oif, struct net_device *dev,
	366	struct in_device idev, u32 itag);
7a9bc9b8	367	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	368	static inline int fib_num_tclassid_users(struct net *net)
	369	{
	370	return net->ipv4.fib_num_tclassid_users;
	371	}
7a9bc9b8	372	#else
f4530fa5 DM	373	static inline int fib_num_tclassid_users(struct net *net)
	374	{
	375	return 0;
	376	}
7a9bc9b8	377	#endif
0ddcf43d	378	int fib_unmerge(struct net *net);
14c85021	379
1da177e4	380	/* Exported by fib_semantics.c */
5c3a0fd7	381	int ip_fib_check_default(__be32 gw, struct net_device *dev);
4f823def	382	int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
5a56a0b3	383	int fib_sync_down_addr(struct net_device *dev, __be32 local);
8a3d0316	384	int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
0e884c78 PN	385
	386	extern u32 fib_multipath_secret __read_mostly;
	387
	388	static inline int fib_multipath_hash(__be32 saddr, __be32 daddr)
	389	{
0797cbd8 LR	390	return jhash_2words((__force u32)saddr, (__force u32)daddr,
0797cbd8 LR	391	fib_multipath_secret) >> 1;
0e884c78 PN	392	}
	393
	394	void fib_select_multipath(struct fib_result *res, int hash);
3ce58d84 DA	395	void fib_select_path(struct net net, struct fib_result res,
3ce58d84 DA	396	struct flowi4 *fl4, int mp_hash);
1da177e4	397
5348ba85	398	/* Exported by fib_trie.c */
5c3a0fd7	399	void fib_trie_init(void);
0ddcf43d	400	struct fib_table fib_trie_table(u32 id, struct fib_table alias);
1da177e4	401
b6bf3ca0	402	static inline void fib_combine_itag(u32 itag, const struct fib_result res)
1da177e4	403	{
c7066f70	404	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	405	#ifdef CONFIG_IP_MULTIPLE_TABLES
	406	u32 rtag;
	407	#endif
	408	itag = FIB_RES_NH(res).nh_tclassid<<16;
	409	#ifdef CONFIG_IP_MULTIPLE_TABLES
85b91b03	410	rtag = res->tclassid;
1da177e4 LT	411	if (*itag == 0)
	412	*itag = (rtag<<16);
	413	*itag \|= (rtag>>16);
	414	#endif
	415	#endif
	416	}
	417
5c3a0fd7	418	void free_fib_info(struct fib_info *fi);
1da177e4	419
1c677b3d IS	420	static inline void fib_info_hold(struct fib_info *fi)
	421	{
	422	atomic_inc(&fi->fib_clntref);
	423	}
	424
1da177e4 LT	425	static inline void fib_info_put(struct fib_info *fi)
	426	{
	427	if (atomic_dec_and_test(&fi->fib_clntref))
	428	free_fib_info(fi);
	429	}
	430
20380731	431	#ifdef CONFIG_PROC_FS
5c3a0fd7 JP	432	int __net_init fib_proc_init(struct net *net);
5c3a0fd7 JP	433	void __net_exit fib_proc_exit(struct net *net);
cc8274f5 LZ	434	#else
	435	static inline int fib_proc_init(struct net *net)
	436	{
	437	return 0;
	438	}
	439	static inline void fib_proc_exit(struct net *net)
	440	{
	441	}
20380731 ACM	442	#endif
20380731 ACM	443
1da177e4	444	#endif /* _NET_FIB_H */