[mirror_ubuntu-artful-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>
#include <linux/refcount.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;
	refcount_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;
	struct dst_metrics	*fib_metrics;
#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
#define fib_advmss fib_metrics->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 {
	__be32		prefix;
	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_rule_notifier_info {
	struct fib_notifier_info info; /* must be first */
	struct fib_rule *rule;
};

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 *,
		     struct netlink_ext_ack *extack);
int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
		     struct netlink_ext_ack *extack);
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;
}

static inline bool fib4_rule_default(const struct fib_rule *rule)
{
	return true;
}

#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;
}

bool fib4_rule_default(const struct fib_rule *rule);

#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);

#ifdef CONFIG_IP_ROUTE_MULTIPATH
int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4,
		       const struct sk_buff *skb);
#endif
void fib_select_multipath(struct fib_result *res, int hash);
void fib_select_path(struct net *net, struct fib_result *res,
		     struct flowi4 *fl4, const struct sk_buff *skb);

/* 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)
{
	refcount_inc(&fi->fib_clntref);
}

static inline void fib_info_put(struct fib_info *fi)
{
	if (refcount_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>
0029c0de	26	#include <linux/refcount.h>
1da177e4	27
4e902c57	28	struct fib_config {
4e902c57	29	u8 fc_dst_len;
4e902c57 TG	30	u8 fc_tos;
	31	u8 fc_protocol;
	32	u8 fc_scope;
	33	u8 fc_type;
b52f070c	34	/* 3 bytes unused */
4e902c57	35	u32 fc_table;
6d85c10a	36	__be32 fc_dst;
6d85c10a	37	__be32 fc_gw;
4e902c57 TG	38	int fc_oif;
	39	u32 fc_flags;
	40	u32 fc_priority;
6d85c10a	41	__be32 fc_prefsrc;
4e902c57 TG	42	struct nlattr *fc_mx;
	43	struct rtnexthop *fc_mp;
	44	int fc_mx_len;
	45	int fc_mp_len;
	46	u32 fc_flow;
4e902c57 TG	47	u32 fc_nlflags;
4e902c57 TG	48	struct nl_info fc_nlinfo;
571e7226 RP	49	struct nlattr *fc_encap;
	50	u16 fc_encap_type;
	51	};
1da177e4 LT	52
1da177e4 LT	53	struct fib_info;
f2bb4bed	54	struct rtable;
1da177e4	55
4895c771 DM	56	struct fib_nh_exception {
4895c771 DM	57	struct fib_nh_exception __rcu *fnhe_next;
5aad1de5	58	int fnhe_genid;
4895c771 DM	59	__be32 fnhe_daddr;
4895c771 DM	60	u32 fnhe_pmtu;
aee06da6	61	__be32 fnhe_gw;
4895c771	62	unsigned long fnhe_expires;
2ffae99d TT	63	struct rtable __rcu *fnhe_rth_input;
2ffae99d TT	64	struct rtable __rcu *fnhe_rth_output;
4895c771	65	unsigned long fnhe_stamp;
deed49df	66	struct rcu_head rcu;
4895c771 DM	67	};
	68
	69	struct fnhe_hash_bucket {
	70	struct fib_nh_exception __rcu *chain;
	71	};
	72
d546c621 ED	73	#define FNHE_HASH_SHIFT 11
d546c621 ED	74	#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
4895c771 DM	75	#define FNHE_RECLAIM_DEPTH 5
4895c771 DM	76
1da177e4 LT	77	struct fib_nh {
	78	struct net_device *nh_dev;
	79	struct hlist_node nh_hash;
	80	struct fib_info *nh_parent;
95c96174	81	unsigned int nh_flags;
1da177e4 LT	82	unsigned char nh_scope;
	83	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	84	int nh_weight;
0e884c78	85	atomic_t nh_upper_bound;
1da177e4	86	#endif
c7066f70	87	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	88	__u32 nh_tclassid;
	89	#endif
	90	int nh_oif;
ed49e3ca	91	__be32 nh_gw;
1fc050a1	92	__be32 nh_saddr;
436c3b66	93	int nh_saddr_genid;
d26b3a7c	94	struct rtable __rcu * __percpu *nh_pcpu_rth_output;
54764bb6	95	struct rtable __rcu *nh_rth_input;
caa41527	96	struct fnhe_hash_bucket __rcu *nh_exceptions;
571e7226	97	struct lwtunnel_state *nh_lwtstate;
1da177e4 LT	98	};
	99
	100	/*
	101	* This structure contains data shared by many of routes.
	102	*/
	103
	104	struct fib_info {
	105	struct hlist_node fib_hash;
	106	struct hlist_node fib_lhash;
7462bd74	107	struct net *fib_net;
1da177e4	108	int fib_treeref;
0029c0de	109	refcount_t fib_clntref;
95c96174	110	unsigned int fib_flags;
37e826c5 DM	111	unsigned char fib_dead;
	112	unsigned char fib_protocol;
	113	unsigned char fib_scope;
f4ef85bb	114	unsigned char fib_type;
b83738ae	115	__be32 fib_prefsrc;
5a56a0b3	116	u32 fib_tb_id;
1da177e4	117	u32 fib_priority;
3fb07daf ED	118	struct dst_metrics *fib_metrics;
	119	#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
	120	#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
	121	#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
	122	#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
1da177e4 LT	123	int fib_nhs;
1da177e4 LT	124	#ifdef CONFIG_IP_ROUTE_MULTIPATH
0e884c78	125	int fib_weight;
1da177e4	126	#endif
c9850187	127	unsigned int fib_offload_cnt;
ebc0ffae	128	struct rcu_head rcu;
1da177e4 LT	129	struct fib_nh fib_nh[0];
	130	#define fib_dev fib_nh[0].nh_dev
	131	};
	132
	133
	134	#ifdef CONFIG_IP_MULTIPLE_TABLES
	135	struct fib_rule;
	136	#endif
	137
5b470441	138	struct fib_table;
1da177e4	139	struct fib_result {
6ffd9034	140	__be32 prefix;
1da177e4 LT	141	unsigned char prefixlen;
	142	unsigned char nh_sel;
	143	unsigned char type;
	144	unsigned char scope;
85b91b03	145	u32 tclassid;
1da177e4	146	struct fib_info *fi;
5b470441	147	struct fib_table *table;
56315f9e	148	struct hlist_head *fa_head;
1da177e4 LT	149	};
1da177e4 LT	150
246955fe	151	struct fib_result_nl {
80e856e1	152	__be32 fl_addr; /* To be looked up*/
5f300893	153	u32 fl_mark;
246955fe RO	154	unsigned char fl_tos;
	155	unsigned char fl_scope;
	156	unsigned char tb_id_in;
	157
	158	unsigned char tb_id; /* Results */
	159	unsigned char prefixlen;
	160	unsigned char nh_sel;
	161	unsigned char type;
	162	unsigned char scope;
	163	int err;
	164	};
1da177e4 LT	165
1da177e4 LT	166	#ifdef CONFIG_IP_ROUTE_MULTIPATH
1da177e4	167	#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
1da177e4	168	#else /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	169	#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
5b9e12db	170	#endif /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	171
5b9e12db	172	#ifdef CONFIG_IP_MULTIPLE_TABLES
93456b6d	173	#define FIB_TABLE_HASHSZ 256
5b9e12db DL	174	#else
	175	#define FIB_TABLE_HASHSZ 2
	176	#endif
1da177e4	177
5c3a0fd7	178	__be32 fib_info_update_nh_saddr(struct net net, struct fib_nh nh);
436c3b66	179
c9850187 JP	180	static inline void fib_info_offload_inc(struct fib_info *fi)
	181	{
	182	fi->fib_offload_cnt++;
	183	fi->fib_flags \|= RTNH_F_OFFLOAD;
	184	}
	185
	186	static inline void fib_info_offload_dec(struct fib_info *fi)
	187	{
	188	if (--fi->fib_offload_cnt == 0)
	189	fi->fib_flags &= ~RTNH_F_OFFLOAD;
	190	}
	191
436c3b66 DM	192	#define FIB_RES_SADDR(net, res) \
	193	((FIB_RES_NH(res).nh_saddr_genid == \
	194	atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
	195	FIB_RES_NH(res).nh_saddr : \
	196	fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
1da177e4 LT	197	#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
	198	#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
	199	#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
	200
436c3b66 DM	201	#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
436c3b66 DM	202	FIB_RES_SADDR(net, res))
1fc050a1	203
b90eb754 JP	204	struct fib_notifier_info {
	205	struct net *net;
	206	};
	207
	208	struct fib_entry_notifier_info {
	209	struct fib_notifier_info info; /* must be first */
	210	u32 dst;
	211	int dst_len;
	212	struct fib_info *fi;
	213	u8 tos;
	214	u8 type;
	215	u32 tb_id;
b90eb754 JP	216	};
b90eb754 JP	217
6a003a5f IS	218	struct fib_rule_notifier_info {
	219	struct fib_notifier_info info; /* must be first */
	220	struct fib_rule *rule;
	221	};
	222
982acb97 IS	223	struct fib_nh_notifier_info {
	224	struct fib_notifier_info info; /* must be first */
	225	struct fib_nh *fib_nh;
	226	};
	227
b90eb754	228	enum fib_event_type {
2f3a5272 IS	229	FIB_EVENT_ENTRY_REPLACE,
2f3a5272 IS	230	FIB_EVENT_ENTRY_APPEND,
b90eb754 JP	231	FIB_EVENT_ENTRY_ADD,
	232	FIB_EVENT_ENTRY_DEL,
	233	FIB_EVENT_RULE_ADD,
	234	FIB_EVENT_RULE_DEL,
982acb97 IS	235	FIB_EVENT_NH_ADD,
982acb97 IS	236	FIB_EVENT_NH_DEL,
b90eb754 JP	237	};
b90eb754 JP	238
c3852ef7 IS	239	int register_fib_notifier(struct notifier_block *nb,
c3852ef7 IS	240	void (cb)(struct notifier_block nb));
b90eb754	241	int unregister_fib_notifier(struct notifier_block *nb);
c0243892 IS	242	int call_fib_notifier(struct notifier_block nb, struct net net,
	243	enum fib_event_type event_type,
	244	struct fib_notifier_info *info);
b90eb754 JP	245	int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
	246	struct fib_notifier_info *info);
	247
d05f7a7d	248	void fib_notify(struct net net, struct notifier_block nb);
c0243892	249	#ifdef CONFIG_IP_MULTIPLE_TABLES
d05f7a7d	250	void fib_rules_notify(struct net net, struct notifier_block nb);
c0243892	251	#else
d05f7a7d	252	static inline void fib_rules_notify(struct net net, struct notifier_block nb)
c0243892 IS	253	{
	254	}
	255	#endif
	256
1da177e4	257	struct fib_table {
8e773277 DM	258	struct hlist_node tb_hlist;
8e773277 DM	259	u32 tb_id;
8e773277	260	int tb_num_default;
a7e53531	261	struct rcu_head rcu;
0ddcf43d AD	262	unsigned long *tb_data;
0ddcf43d AD	263	unsigned long __data[0];
1da177e4 LT	264	};
1da177e4 LT	265
5c3a0fd7 JP	266	int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
5c3a0fd7 JP	267	struct fib_result *res, int fib_flags);
6d8422a1 DA	268	int fib_table_insert(struct net , struct fib_table , struct fib_config *,
6d8422a1 DA	269	struct netlink_ext_ack *extack);
78055998 DA	270	int fib_table_delete(struct net , struct fib_table , struct fib_config *,
78055998 DA	271	struct netlink_ext_ack *extack);
5c3a0fd7 JP	272	int fib_table_dump(struct fib_table table, struct sk_buff skb,
5c3a0fd7 JP	273	struct netlink_callback *cb);
b90eb754	274	int fib_table_flush(struct net net, struct fib_table table);
0ddcf43d	275	struct fib_table fib_trie_unmerge(struct fib_table main_tb);
3b709334	276	void fib_table_flush_external(struct fib_table *table);
5c3a0fd7	277	void fib_free_table(struct fib_table *tb);
4aa2c466	278
1da177e4 LT	279	#ifndef CONFIG_IP_MULTIPLE_TABLES
1da177e4 LT	280
a5a519b2 AD	281	#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
a5a519b2 AD	282	#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
1da177e4	283
8ad4942c	284	static inline struct fib_table fib_get_table(struct net net, u32 id)
1da177e4	285	{
a7e53531	286	struct hlist_node *tb_hlist;
93456b6d DL	287	struct hlist_head *ptr;
	288
	289	ptr = id == RT_TABLE_LOCAL ?
e4aef8ae DL	290	&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
e4aef8ae DL	291	&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
a7e53531 AD	292
	293	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
	294
	295	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
1da177e4 LT	296	}
1da177e4 LT	297
8ad4942c	298	static inline struct fib_table fib_new_table(struct net net, u32 id)
1da177e4	299	{
8ad4942c	300	return fib_get_table(net, id);
1da177e4 LT	301	}
1da177e4 LT	302
22bd5b9b	303	static inline int fib_lookup(struct net net, const struct flowi4 flp,
0eeb075f	304	struct fib_result *res, unsigned int flags)
1da177e4	305	{
a7e53531	306	struct fib_table *tb;
0ddcf43d	307	int err = -ENETUNREACH;
345e9b54 AD	308
	309	rcu_read_lock();
	310
0ddcf43d	311	tb = fib_get_table(net, RT_TABLE_MAIN);
0315e382 NF	312	if (tb)
	313	err = fib_table_lookup(tb, flp, res, flags \| FIB_LOOKUP_NOREF);
	314
	315	if (err == -EAGAIN)
	316	err = -ENETUNREACH;
93456b6d	317
345e9b54	318	rcu_read_unlock();
93456b6d	319
345e9b54	320	return err;
1da177e4 LT	321	}
1da177e4 LT	322
3c71006d IS	323	static inline bool fib4_rule_default(const struct fib_rule *rule)
	324	{
	325	return true;
	326	}
	327
1da177e4	328	#else /* CONFIG_IP_MULTIPLE_TABLES */
5c3a0fd7 JP	329	int __net_init fib4_rules_init(struct net *net);
5c3a0fd7 JP	330	void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	331
5c3a0fd7 JP	332	struct fib_table fib_new_table(struct net net, u32 id);
5c3a0fd7 JP	333	struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	334
0eeb075f AG	335	int __fib_lookup(struct net net, struct flowi4 flp,
0eeb075f AG	336	struct fib_result *res, unsigned int flags);
f4530fa5 DM	337
f4530fa5 DM	338	static inline int fib_lookup(struct net net, struct flowi4 flp,
0eeb075f	339	struct fib_result *res, unsigned int flags)
f4530fa5	340	{
a7e53531	341	struct fib_table *tb;
0315e382	342	int err = -ENETUNREACH;
a7e53531	343
0eeb075f	344	flags \|= FIB_LOOKUP_NOREF;
a7e53531	345	if (net->ipv4.fib_has_custom_rules)
0eeb075f	346	return __fib_lookup(net, flp, res, flags);
a7e53531 AD	347
	348	rcu_read_lock();
	349
	350	res->tclassid = 0;
	351
0315e382 NF	352	tb = rcu_dereference_rtnl(net->ipv4.fib_main);
	353	if (tb)
	354	err = fib_table_lookup(tb, flp, res, flags);
	355
	356	if (!err)
	357	goto out;
	358
	359	tb = rcu_dereference_rtnl(net->ipv4.fib_default);
	360	if (tb)
	361	err = fib_table_lookup(tb, flp, res, flags);
a7e53531	362
0315e382 NF	363	out:
	364	if (err == -EAGAIN)
	365	err = -ENETUNREACH;
a7e53531 AD	366
	367	rcu_read_unlock();
	368
	369	return err;
f4530fa5 DM	370	}
f4530fa5 DM	371
3c71006d IS	372	bool fib4_rule_default(const struct fib_rule *rule);
3c71006d IS	373
1da177e4 LT	374	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	375
	376	/* Exported by fib_frontend.c */
ef7c79ed	377	extern const struct nla_policy rtm_ipv4_policy[];
5c3a0fd7 JP	378	void ip_fib_init(void);
	379	__be32 fib_compute_spec_dst(struct sk_buff *skb);
	380	int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
	381	u8 tos, int oif, struct net_device *dev,
	382	struct in_device idev, u32 itag);
7a9bc9b8	383	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	384	static inline int fib_num_tclassid_users(struct net *net)
	385	{
	386	return net->ipv4.fib_num_tclassid_users;
	387	}
7a9bc9b8	388	#else
f4530fa5 DM	389	static inline int fib_num_tclassid_users(struct net *net)
	390	{
	391	return 0;
	392	}
7a9bc9b8	393	#endif
0ddcf43d	394	int fib_unmerge(struct net *net);
14c85021	395
1da177e4	396	/* Exported by fib_semantics.c */
5c3a0fd7	397	int ip_fib_check_default(__be32 gw, struct net_device *dev);
4f823def	398	int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
5a56a0b3	399	int fib_sync_down_addr(struct net_device *dev, __be32 local);
8a3d0316	400	int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
0e884c78	401
bf4e0a3d NA	402	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	403	int fib_multipath_hash(const struct fib_info fi, const struct flowi4 fl4,
	404	const struct sk_buff *skb);
	405	#endif
0e884c78	406	void fib_select_multipath(struct fib_result *res, int hash);
3ce58d84	407	void fib_select_path(struct net net, struct fib_result res,
bf4e0a3d	408	struct flowi4 fl4, const struct sk_buff skb);
1da177e4	409
5348ba85	410	/* Exported by fib_trie.c */
5c3a0fd7	411	void fib_trie_init(void);
0ddcf43d	412	struct fib_table fib_trie_table(u32 id, struct fib_table alias);
1da177e4	413
b6bf3ca0	414	static inline void fib_combine_itag(u32 itag, const struct fib_result res)
1da177e4	415	{
c7066f70	416	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	417	#ifdef CONFIG_IP_MULTIPLE_TABLES
	418	u32 rtag;
	419	#endif
	420	itag = FIB_RES_NH(res).nh_tclassid<<16;
	421	#ifdef CONFIG_IP_MULTIPLE_TABLES
85b91b03	422	rtag = res->tclassid;
1da177e4 LT	423	if (*itag == 0)
	424	*itag = (rtag<<16);
	425	*itag \|= (rtag>>16);
	426	#endif
	427	#endif
	428	}
	429
5c3a0fd7	430	void free_fib_info(struct fib_info *fi);
1da177e4	431
1c677b3d IS	432	static inline void fib_info_hold(struct fib_info *fi)
1c677b3d IS	433	{
0029c0de	434	refcount_inc(&fi->fib_clntref);
1c677b3d IS	435	}
1c677b3d IS	436
1da177e4 LT	437	static inline void fib_info_put(struct fib_info *fi)
1da177e4 LT	438	{
0029c0de	439	if (refcount_dec_and_test(&fi->fib_clntref))
1da177e4 LT	440	free_fib_info(fi);
	441	}
	442
20380731	443	#ifdef CONFIG_PROC_FS
5c3a0fd7 JP	444	int __net_init fib_proc_init(struct net *net);
5c3a0fd7 JP	445	void __net_exit fib_proc_exit(struct net *net);
cc8274f5 LZ	446	#else
	447	static inline int fib_proc_init(struct net *net)
	448	{
	449	return 0;
	450	}
	451	static inline void fib_proc_exit(struct net *net)
	452	{
	453	}
20380731 ACM	454	#endif
20380731 ACM	455
1da177e4	456	#endif /* _NET_FIB_H */