[mirror_ubuntu-bionic-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_notifier.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
	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);

#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_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;
};

int call_fib4_notifier(struct notifier_block *nb, struct net *net,
		       enum fib_event_type event_type,
		       struct fib_notifier_info *info);
int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
			struct fib_notifier_info *info);

int __net_init fib4_notifier_init(struct net *net);
void __net_exit fib4_notifier_exit(struct net *net);

void fib_notify(struct net *net, struct notifier_block *nb);

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;
}

static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb)
{
	return 0;
}

static inline unsigned int fib4_rules_seq_read(struct net *net)
{
	return 0;
}

#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);
int fib4_rules_dump(struct net *net, struct notifier_block *nb);
unsigned int fib4_rules_seq_read(struct net *net);

#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>
04b1d4e5	22	#include <net/fib_notifier.h>
e1ef4bf2	23	#include <net/fib_rules.h>
8e773277	24	#include <net/inetpeer.h>
d26b3a7c	25	#include <linux/percpu.h>
b90eb754	26	#include <linux/notifier.h>
0029c0de	27	#include <linux/refcount.h>
1da177e4	28
4e902c57	29	struct fib_config {
4e902c57	30	u8 fc_dst_len;
4e902c57 TG	31	u8 fc_tos;
	32	u8 fc_protocol;
	33	u8 fc_scope;
	34	u8 fc_type;
b52f070c	35	/* 3 bytes unused */
4e902c57	36	u32 fc_table;
6d85c10a	37	__be32 fc_dst;
6d85c10a	38	__be32 fc_gw;
4e902c57 TG	39	int fc_oif;
	40	u32 fc_flags;
	41	u32 fc_priority;
6d85c10a	42	__be32 fc_prefsrc;
4e902c57 TG	43	struct nlattr *fc_mx;
	44	struct rtnexthop *fc_mp;
	45	int fc_mx_len;
	46	int fc_mp_len;
	47	u32 fc_flow;
4e902c57 TG	48	u32 fc_nlflags;
4e902c57 TG	49	struct nl_info fc_nlinfo;
571e7226 RP	50	struct nlattr *fc_encap;
	51	u16 fc_encap_type;
	52	};
1da177e4 LT	53
1da177e4 LT	54	struct fib_info;
f2bb4bed	55	struct rtable;
1da177e4	56
4895c771 DM	57	struct fib_nh_exception {
4895c771 DM	58	struct fib_nh_exception __rcu *fnhe_next;
5aad1de5	59	int fnhe_genid;
4895c771 DM	60	__be32 fnhe_daddr;
4895c771 DM	61	u32 fnhe_pmtu;
aee06da6	62	__be32 fnhe_gw;
4895c771	63	unsigned long fnhe_expires;
2ffae99d TT	64	struct rtable __rcu *fnhe_rth_input;
2ffae99d TT	65	struct rtable __rcu *fnhe_rth_output;
4895c771	66	unsigned long fnhe_stamp;
deed49df	67	struct rcu_head rcu;
4895c771 DM	68	};
	69
	70	struct fnhe_hash_bucket {
	71	struct fib_nh_exception __rcu *chain;
	72	};
	73
d546c621 ED	74	#define FNHE_HASH_SHIFT 11
d546c621 ED	75	#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
4895c771 DM	76	#define FNHE_RECLAIM_DEPTH 5
4895c771 DM	77
1da177e4 LT	78	struct fib_nh {
	79	struct net_device *nh_dev;
	80	struct hlist_node nh_hash;
	81	struct fib_info *nh_parent;
95c96174	82	unsigned int nh_flags;
1da177e4 LT	83	unsigned char nh_scope;
	84	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	85	int nh_weight;
0e884c78	86	atomic_t nh_upper_bound;
1da177e4	87	#endif
c7066f70	88	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	89	__u32 nh_tclassid;
	90	#endif
	91	int nh_oif;
ed49e3ca	92	__be32 nh_gw;
1fc050a1	93	__be32 nh_saddr;
436c3b66	94	int nh_saddr_genid;
d26b3a7c	95	struct rtable __rcu * __percpu *nh_pcpu_rth_output;
54764bb6	96	struct rtable __rcu *nh_rth_input;
caa41527	97	struct fnhe_hash_bucket __rcu *nh_exceptions;
571e7226	98	struct lwtunnel_state *nh_lwtstate;
1da177e4 LT	99	};
	100
	101	/*
	102	* This structure contains data shared by many of routes.
	103	*/
	104
	105	struct fib_info {
	106	struct hlist_node fib_hash;
	107	struct hlist_node fib_lhash;
7462bd74	108	struct net *fib_net;
1da177e4	109	int fib_treeref;
0029c0de	110	refcount_t fib_clntref;
95c96174	111	unsigned int fib_flags;
37e826c5 DM	112	unsigned char fib_dead;
	113	unsigned char fib_protocol;
	114	unsigned char fib_scope;
f4ef85bb	115	unsigned char fib_type;
b83738ae	116	__be32 fib_prefsrc;
5a56a0b3	117	u32 fib_tb_id;
1da177e4	118	u32 fib_priority;
3fb07daf ED	119	struct dst_metrics *fib_metrics;
	120	#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
	121	#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
	122	#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
	123	#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
1da177e4 LT	124	int fib_nhs;
1da177e4 LT	125	#ifdef CONFIG_IP_ROUTE_MULTIPATH
0e884c78	126	int fib_weight;
1da177e4	127	#endif
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 DM	179
	180	#define FIB_RES_SADDR(net, res) \
	181	((FIB_RES_NH(res).nh_saddr_genid == \
	182	atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
	183	FIB_RES_NH(res).nh_saddr : \
	184	fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
1da177e4 LT	185	#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
	186	#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
	187	#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
	188
436c3b66 DM	189	#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
436c3b66 DM	190	FIB_RES_SADDR(net, res))
1fc050a1	191
b90eb754 JP	192	struct fib_entry_notifier_info {
	193	struct fib_notifier_info info; /* must be first */
	194	u32 dst;
	195	int dst_len;
	196	struct fib_info *fi;
	197	u8 tos;
	198	u8 type;
	199	u32 tb_id;
b90eb754 JP	200	};
b90eb754 JP	201
982acb97 IS	202	struct fib_nh_notifier_info {
	203	struct fib_notifier_info info; /* must be first */
	204	struct fib_nh *fib_nh;
	205	};
	206
04b1d4e5 IS	207	int call_fib4_notifier(struct notifier_block nb, struct net net,
04b1d4e5 IS	208	enum fib_event_type event_type,
b90eb754	209	struct fib_notifier_info *info);
04b1d4e5 IS	210	int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
	211	struct fib_notifier_info *info);
	212
	213	int __net_init fib4_notifier_init(struct net *net);
	214	void __net_exit fib4_notifier_exit(struct net *net);
b90eb754	215
d05f7a7d	216	void fib_notify(struct net net, struct notifier_block nb);
c0243892	217
1da177e4	218	struct fib_table {
8e773277 DM	219	struct hlist_node tb_hlist;
8e773277 DM	220	u32 tb_id;
8e773277	221	int tb_num_default;
a7e53531	222	struct rcu_head rcu;
0ddcf43d AD	223	unsigned long *tb_data;
0ddcf43d AD	224	unsigned long __data[0];
1da177e4 LT	225	};
1da177e4 LT	226
5c3a0fd7 JP	227	int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
5c3a0fd7 JP	228	struct fib_result *res, int fib_flags);
6d8422a1 DA	229	int fib_table_insert(struct net , struct fib_table , struct fib_config *,
6d8422a1 DA	230	struct netlink_ext_ack *extack);
78055998 DA	231	int fib_table_delete(struct net , struct fib_table , struct fib_config *,
78055998 DA	232	struct netlink_ext_ack *extack);
5c3a0fd7 JP	233	int fib_table_dump(struct fib_table table, struct sk_buff skb,
5c3a0fd7 JP	234	struct netlink_callback *cb);
b90eb754	235	int fib_table_flush(struct net net, struct fib_table table);
0ddcf43d	236	struct fib_table fib_trie_unmerge(struct fib_table main_tb);
3b709334	237	void fib_table_flush_external(struct fib_table *table);
5c3a0fd7	238	void fib_free_table(struct fib_table *tb);
4aa2c466	239
1da177e4 LT	240	#ifndef CONFIG_IP_MULTIPLE_TABLES
1da177e4 LT	241
a5a519b2 AD	242	#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
a5a519b2 AD	243	#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
1da177e4	244
8ad4942c	245	static inline struct fib_table fib_get_table(struct net net, u32 id)
1da177e4	246	{
a7e53531	247	struct hlist_node *tb_hlist;
93456b6d DL	248	struct hlist_head *ptr;
	249
	250	ptr = id == RT_TABLE_LOCAL ?
e4aef8ae DL	251	&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
e4aef8ae DL	252	&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
a7e53531 AD	253
	254	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
	255
	256	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
1da177e4 LT	257	}
1da177e4 LT	258
8ad4942c	259	static inline struct fib_table fib_new_table(struct net net, u32 id)
1da177e4	260	{
8ad4942c	261	return fib_get_table(net, id);
1da177e4 LT	262	}
1da177e4 LT	263
22bd5b9b	264	static inline int fib_lookup(struct net net, const struct flowi4 flp,
0eeb075f	265	struct fib_result *res, unsigned int flags)
1da177e4	266	{
a7e53531	267	struct fib_table *tb;
0ddcf43d	268	int err = -ENETUNREACH;
345e9b54 AD	269
	270	rcu_read_lock();
	271
0ddcf43d	272	tb = fib_get_table(net, RT_TABLE_MAIN);
0315e382 NF	273	if (tb)
	274	err = fib_table_lookup(tb, flp, res, flags \| FIB_LOOKUP_NOREF);
	275
	276	if (err == -EAGAIN)
	277	err = -ENETUNREACH;
93456b6d	278
345e9b54	279	rcu_read_unlock();
93456b6d	280
345e9b54	281	return err;
1da177e4 LT	282	}
1da177e4 LT	283
3c71006d IS	284	static inline bool fib4_rule_default(const struct fib_rule *rule)
	285	{
	286	return true;
	287	}
	288
1b2a4440 IS	289	static inline int fib4_rules_dump(struct net net, struct notifier_block nb)
	290	{
	291	return 0;
	292	}
	293
	294	static inline unsigned int fib4_rules_seq_read(struct net *net)
	295	{
	296	return 0;
	297	}
	298
1da177e4	299	#else /* CONFIG_IP_MULTIPLE_TABLES */
5c3a0fd7 JP	300	int __net_init fib4_rules_init(struct net *net);
5c3a0fd7 JP	301	void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	302
5c3a0fd7 JP	303	struct fib_table fib_new_table(struct net net, u32 id);
5c3a0fd7 JP	304	struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	305
0eeb075f AG	306	int __fib_lookup(struct net net, struct flowi4 flp,
0eeb075f AG	307	struct fib_result *res, unsigned int flags);
f4530fa5 DM	308
f4530fa5 DM	309	static inline int fib_lookup(struct net net, struct flowi4 flp,
0eeb075f	310	struct fib_result *res, unsigned int flags)
f4530fa5	311	{
a7e53531	312	struct fib_table *tb;
0315e382	313	int err = -ENETUNREACH;
a7e53531	314
0eeb075f	315	flags \|= FIB_LOOKUP_NOREF;
a7e53531	316	if (net->ipv4.fib_has_custom_rules)
0eeb075f	317	return __fib_lookup(net, flp, res, flags);
a7e53531 AD	318
	319	rcu_read_lock();
	320
	321	res->tclassid = 0;
	322
0315e382 NF	323	tb = rcu_dereference_rtnl(net->ipv4.fib_main);
	324	if (tb)
	325	err = fib_table_lookup(tb, flp, res, flags);
	326
	327	if (!err)
	328	goto out;
	329
	330	tb = rcu_dereference_rtnl(net->ipv4.fib_default);
	331	if (tb)
	332	err = fib_table_lookup(tb, flp, res, flags);
a7e53531	333
0315e382 NF	334	out:
	335	if (err == -EAGAIN)
	336	err = -ENETUNREACH;
a7e53531 AD	337
	338	rcu_read_unlock();
	339
	340	return err;
f4530fa5 DM	341	}
f4530fa5 DM	342
3c71006d	343	bool fib4_rule_default(const struct fib_rule *rule);
1b2a4440 IS	344	int fib4_rules_dump(struct net net, struct notifier_block nb);
1b2a4440 IS	345	unsigned int fib4_rules_seq_read(struct net *net);
3c71006d	346
1da177e4 LT	347	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	348
	349	/* Exported by fib_frontend.c */
ef7c79ed	350	extern const struct nla_policy rtm_ipv4_policy[];
5c3a0fd7 JP	351	void ip_fib_init(void);
	352	__be32 fib_compute_spec_dst(struct sk_buff *skb);
	353	int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
	354	u8 tos, int oif, struct net_device *dev,
	355	struct in_device idev, u32 itag);
7a9bc9b8	356	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	357	static inline int fib_num_tclassid_users(struct net *net)
	358	{
	359	return net->ipv4.fib_num_tclassid_users;
	360	}
7a9bc9b8	361	#else
f4530fa5 DM	362	static inline int fib_num_tclassid_users(struct net *net)
	363	{
	364	return 0;
	365	}
7a9bc9b8	366	#endif
0ddcf43d	367	int fib_unmerge(struct net *net);
14c85021	368
1da177e4	369	/* Exported by fib_semantics.c */
5c3a0fd7	370	int ip_fib_check_default(__be32 gw, struct net_device *dev);
4f823def	371	int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
5a56a0b3	372	int fib_sync_down_addr(struct net_device *dev, __be32 local);
8a3d0316	373	int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
0e884c78	374
bf4e0a3d NA	375	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	376	int fib_multipath_hash(const struct fib_info fi, const struct flowi4 fl4,
	377	const struct sk_buff *skb);
	378	#endif
0e884c78	379	void fib_select_multipath(struct fib_result *res, int hash);
3ce58d84	380	void fib_select_path(struct net net, struct fib_result res,
bf4e0a3d	381	struct flowi4 fl4, const struct sk_buff skb);
1da177e4	382
5348ba85	383	/* Exported by fib_trie.c */
5c3a0fd7	384	void fib_trie_init(void);
0ddcf43d	385	struct fib_table fib_trie_table(u32 id, struct fib_table alias);
1da177e4	386
b6bf3ca0	387	static inline void fib_combine_itag(u32 itag, const struct fib_result res)
1da177e4	388	{
c7066f70	389	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	390	#ifdef CONFIG_IP_MULTIPLE_TABLES
	391	u32 rtag;
	392	#endif
	393	itag = FIB_RES_NH(res).nh_tclassid<<16;
	394	#ifdef CONFIG_IP_MULTIPLE_TABLES
85b91b03	395	rtag = res->tclassid;
1da177e4 LT	396	if (*itag == 0)
	397	*itag = (rtag<<16);
	398	*itag \|= (rtag>>16);
	399	#endif
	400	#endif
	401	}
	402
5c3a0fd7	403	void free_fib_info(struct fib_info *fi);
1da177e4	404
1c677b3d IS	405	static inline void fib_info_hold(struct fib_info *fi)
1c677b3d IS	406	{
0029c0de	407	refcount_inc(&fi->fib_clntref);
1c677b3d IS	408	}
1c677b3d IS	409
1da177e4 LT	410	static inline void fib_info_put(struct fib_info *fi)
1da177e4 LT	411	{
0029c0de	412	if (refcount_dec_and_test(&fi->fib_clntref))
1da177e4 LT	413	free_fib_info(fi);
	414	}
	415
20380731	416	#ifdef CONFIG_PROC_FS
5c3a0fd7 JP	417	int __net_init fib_proc_init(struct net *net);
5c3a0fd7 JP	418	void __net_exit fib_proc_exit(struct net *net);
cc8274f5 LZ	419	#else
	420	static inline int fib_proc_init(struct net *net)
	421	{
	422	return 0;
	423	}
	424	static inline void fib_proc_exit(struct net *net)
	425	{
	426	}
20380731 ACM	427	#endif
20380731 ACM	428
1da177e4	429	#endif /* _NET_FIB_H */