[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_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;
	bool				fnhe_mtu_locked;
	__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_common {
	struct net_device	*nhc_dev;
	int			nhc_oif;
	unsigned int		nhc_flags;
	struct lwtunnel_state	*nhc_lwtstate;
	unsigned char		nhc_scope;
	u8			nhc_family;
	u8			nhc_has_gw:1,
				unused:7;
	union {
		__be32          ipv4;
		struct in6_addr ipv6;
	} nhc_gw;

	int			nhc_weight;
	atomic_t		nhc_upper_bound;
};

struct fib_nh {
	struct fib_nh_common	nh_common;
	struct hlist_node	nh_hash;
	struct fib_info		*nh_parent;
#ifdef CONFIG_IP_ROUTE_CLASSID
	__u32			nh_tclassid;
#endif
	__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;
#define fib_nh_family		nh_common.nhc_family
#define fib_nh_dev		nh_common.nhc_dev
#define fib_nh_oif		nh_common.nhc_oif
#define fib_nh_flags		nh_common.nhc_flags
#define fib_nh_lws		nh_common.nhc_lwtstate
#define fib_nh_scope		nh_common.nhc_scope
#define fib_nh_family		nh_common.nhc_family
#define fib_nh_has_gw		nh_common.nhc_has_gw
#define fib_nh_gw4		nh_common.nhc_gw.ipv4
#define fib_nh_gw6		nh_common.nhc_gw.ipv6
#define fib_nh_weight		nh_common.nhc_weight
#define fib_nh_upper_bound	nh_common.nhc_upper_bound
};

/*
 * 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;
	struct rcu_head		rcu;
	struct fib_nh		fib_nh[0];
#define fib_dev		fib_nh[0].fib_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).fib_nh_gw4)
#define FIB_RES_DEV(res)		(FIB_RES_NH(res).fib_nh_dev)
#define FIB_RES_OIF(res)		(FIB_RES_NH(res).fib_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];
};

struct fib_dump_filter {
	u32			table_id;
	/* filter_set is an optimization that an entry is set */
	bool			filter_set;
	bool			dump_all_families;
	unsigned char		protocol;
	unsigned char		rt_type;
	unsigned int		flags;
	struct net_device	*dev;
};

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, struct fib_dump_filter *filter);
int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all);
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;
}

static inline bool fib4_rules_early_flow_dissect(struct net *net,
						 struct sk_buff *skb,
						 struct flowi4 *fl4,
						 struct flow_keys *flkeys)
{
	return false;
}
#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);

static inline bool fib4_rules_early_flow_dissect(struct net *net,
						 struct sk_buff *skb,
						 struct flowi4 *fl4,
						 struct flow_keys *flkeys)
{
	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;

	if (!net->ipv4.fib_rules_require_fldissect)
		return false;

	skb_flow_dissect_flow_keys(skb, flkeys, flag);
	fl4->fl4_sport = flkeys->ports.src;
	fl4->fl4_dport = flkeys->ports.dst;
	fl4->flowi4_proto = flkeys->basic.ip_proto;

	return true;
}

#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);
bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev);
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);
void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);

#ifdef CONFIG_IP_ROUTE_MULTIPATH
int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
		       const struct sk_buff *skb, struct flow_keys *flkeys);
#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);

int fib_nh_init(struct net *net, struct fib_nh *fib_nh,
		struct fib_config *cfg, int nh_weight,
		struct netlink_ext_ack *extack);
void fib_nh_release(struct net *net, struct fib_nh *fib_nh);
int fib_nh_common_init(struct fib_nh_common *nhc, struct nlattr *fc_encap,
		       u16 fc_encap_type, void *cfg, gfp_t gfp_flags,
		       struct netlink_ext_ack *extack);
void fib_nh_common_release(struct fib_nh_common *nhc);

/* 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

u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);

int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
			  struct fib_dump_filter *filter,
			  struct netlink_callback *cb);
#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;
d52e5a7e	62	bool fnhe_mtu_locked;
aee06da6	63	__be32 fnhe_gw;
4895c771	64	unsigned long fnhe_expires;
2ffae99d TT	65	struct rtable __rcu *fnhe_rth_input;
2ffae99d TT	66	struct rtable __rcu *fnhe_rth_output;
4895c771	67	unsigned long fnhe_stamp;
deed49df	68	struct rcu_head rcu;
4895c771 DM	69	};
	70
	71	struct fnhe_hash_bucket {
	72	struct fib_nh_exception __rcu *chain;
	73	};
	74
d546c621 ED	75	#define FNHE_HASH_SHIFT 11
d546c621 ED	76	#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
4895c771 DM	77	#define FNHE_RECLAIM_DEPTH 5
4895c771 DM	78
f1741730 DA	79	struct fib_nh_common {
	80	struct net_device *nhc_dev;
	81	int nhc_oif;
	82	unsigned int nhc_flags;
	83	struct lwtunnel_state *nhc_lwtstate;
	84	unsigned char nhc_scope;
	85	u8 nhc_family;
	86	u8 nhc_has_gw:1,
	87	unused:7;
	88	union {
	89	__be32 ipv4;
	90	struct in6_addr ipv6;
	91	} nhc_gw;
	92
	93	int nhc_weight;
	94	atomic_t nhc_upper_bound;
	95	};
	96
1da177e4	97	struct fib_nh {
f1741730	98	struct fib_nh_common nh_common;
1da177e4 LT	99	struct hlist_node nh_hash;
1da177e4 LT	100	struct fib_info *nh_parent;
c7066f70	101	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	102	__u32 nh_tclassid;
1da177e4 LT	103	#endif
1fc050a1	104	__be32 nh_saddr;
436c3b66	105	int nh_saddr_genid;
d26b3a7c	106	struct rtable __rcu * __percpu *nh_pcpu_rth_output;
54764bb6	107	struct rtable __rcu *nh_rth_input;
caa41527	108	struct fnhe_hash_bucket __rcu *nh_exceptions;
f1741730 DA	109	#define fib_nh_family nh_common.nhc_family
	110	#define fib_nh_dev nh_common.nhc_dev
	111	#define fib_nh_oif nh_common.nhc_oif
	112	#define fib_nh_flags nh_common.nhc_flags
	113	#define fib_nh_lws nh_common.nhc_lwtstate
	114	#define fib_nh_scope nh_common.nhc_scope
	115	#define fib_nh_family nh_common.nhc_family
	116	#define fib_nh_has_gw nh_common.nhc_has_gw
	117	#define fib_nh_gw4 nh_common.nhc_gw.ipv4
	118	#define fib_nh_gw6 nh_common.nhc_gw.ipv6
	119	#define fib_nh_weight nh_common.nhc_weight
	120	#define fib_nh_upper_bound nh_common.nhc_upper_bound
1da177e4 LT	121	};
	122
	123	/*
	124	* This structure contains data shared by many of routes.
	125	*/
	126
	127	struct fib_info {
	128	struct hlist_node fib_hash;
	129	struct hlist_node fib_lhash;
7462bd74	130	struct net *fib_net;
1da177e4	131	int fib_treeref;
0029c0de	132	refcount_t fib_clntref;
95c96174	133	unsigned int fib_flags;
37e826c5 DM	134	unsigned char fib_dead;
	135	unsigned char fib_protocol;
	136	unsigned char fib_scope;
f4ef85bb	137	unsigned char fib_type;
b83738ae	138	__be32 fib_prefsrc;
5a56a0b3	139	u32 fib_tb_id;
1da177e4	140	u32 fib_priority;
3fb07daf ED	141	struct dst_metrics *fib_metrics;
	142	#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
	143	#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
	144	#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
	145	#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
1da177e4	146	int fib_nhs;
ebc0ffae	147	struct rcu_head rcu;
1da177e4	148	struct fib_nh fib_nh[0];
b75ed8b1	149	#define fib_dev fib_nh[0].fib_nh_dev
1da177e4 LT	150	};
	151
	152
	153	#ifdef CONFIG_IP_MULTIPLE_TABLES
	154	struct fib_rule;
	155	#endif
	156
5b470441	157	struct fib_table;
1da177e4	158	struct fib_result {
6ffd9034	159	__be32 prefix;
1da177e4 LT	160	unsigned char prefixlen;
	161	unsigned char nh_sel;
	162	unsigned char type;
	163	unsigned char scope;
85b91b03	164	u32 tclassid;
1da177e4	165	struct fib_info *fi;
5b470441	166	struct fib_table *table;
56315f9e	167	struct hlist_head *fa_head;
1da177e4 LT	168	};
1da177e4 LT	169
246955fe	170	struct fib_result_nl {
80e856e1	171	__be32 fl_addr; /* To be looked up*/
5f300893	172	u32 fl_mark;
246955fe RO	173	unsigned char fl_tos;
	174	unsigned char fl_scope;
	175	unsigned char tb_id_in;
	176
	177	unsigned char tb_id; /* Results */
	178	unsigned char prefixlen;
	179	unsigned char nh_sel;
	180	unsigned char type;
	181	unsigned char scope;
82695b30	182	int err;
246955fe	183	};
1da177e4 LT	184
1da177e4 LT	185	#ifdef CONFIG_IP_ROUTE_MULTIPATH
1da177e4	186	#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
1da177e4	187	#else /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	188	#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
5b9e12db	189	#endif /* CONFIG_IP_ROUTE_MULTIPATH */
1da177e4	190
5b9e12db	191	#ifdef CONFIG_IP_MULTIPLE_TABLES
93456b6d	192	#define FIB_TABLE_HASHSZ 256
5b9e12db DL	193	#else
	194	#define FIB_TABLE_HASHSZ 2
	195	#endif
1da177e4	196
5c3a0fd7	197	__be32 fib_info_update_nh_saddr(struct net net, struct fib_nh nh);
436c3b66 DM	198
	199	#define FIB_RES_SADDR(net, res) \
	200	((FIB_RES_NH(res).nh_saddr_genid == \
	201	atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
	202	FIB_RES_NH(res).nh_saddr : \
	203	fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
b75ed8b1 DA	204	#define FIB_RES_GW(res) (FIB_RES_NH(res).fib_nh_gw4)
	205	#define FIB_RES_DEV(res) (FIB_RES_NH(res).fib_nh_dev)
	206	#define FIB_RES_OIF(res) (FIB_RES_NH(res).fib_nh_oif)
1da177e4	207
436c3b66 DM	208	#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
436c3b66 DM	209	FIB_RES_SADDR(net, res))
1fc050a1	210
b90eb754 JP	211	struct fib_entry_notifier_info {
	212	struct fib_notifier_info info; /* must be first */
	213	u32 dst;
	214	int dst_len;
	215	struct fib_info *fi;
	216	u8 tos;
	217	u8 type;
	218	u32 tb_id;
b90eb754 JP	219	};
b90eb754 JP	220
982acb97 IS	221	struct fib_nh_notifier_info {
	222	struct fib_notifier_info info; /* must be first */
	223	struct fib_nh *fib_nh;
	224	};
	225
04b1d4e5 IS	226	int call_fib4_notifier(struct notifier_block nb, struct net net,
04b1d4e5 IS	227	enum fib_event_type event_type,
b90eb754	228	struct fib_notifier_info *info);
04b1d4e5 IS	229	int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
	230	struct fib_notifier_info *info);
	231
	232	int __net_init fib4_notifier_init(struct net *net);
	233	void __net_exit fib4_notifier_exit(struct net *net);
b90eb754	234
d05f7a7d	235	void fib_notify(struct net net, struct notifier_block nb);
c0243892	236
1da177e4	237	struct fib_table {
8e773277 DM	238	struct hlist_node tb_hlist;
8e773277 DM	239	u32 tb_id;
8e773277	240	int tb_num_default;
a7e53531	241	struct rcu_head rcu;
0ddcf43d AD	242	unsigned long *tb_data;
0ddcf43d AD	243	unsigned long __data[0];
1da177e4 LT	244	};
1da177e4 LT	245
4724676d DA	246	struct fib_dump_filter {
	247	u32 table_id;
	248	/* filter_set is an optimization that an entry is set */
	249	bool filter_set;
ae677bbb	250	bool dump_all_families;
4724676d DA	251	unsigned char protocol;
	252	unsigned char rt_type;
	253	unsigned int flags;
	254	struct net_device *dev;
	255	};
	256
5c3a0fd7 JP	257	int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
5c3a0fd7 JP	258	struct fib_result *res, int fib_flags);
6d8422a1 DA	259	int fib_table_insert(struct net , struct fib_table , struct fib_config *,
6d8422a1 DA	260	struct netlink_ext_ack *extack);
78055998 DA	261	int fib_table_delete(struct net , struct fib_table , struct fib_config *,
78055998 DA	262	struct netlink_ext_ack *extack);
5c3a0fd7	263	int fib_table_dump(struct fib_table table, struct sk_buff skb,
18a8021a	264	struct netlink_callback cb, struct fib_dump_filter filter);
f97f4dd8	265	int fib_table_flush(struct net net, struct fib_table table, bool flush_all);
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
3c71006d IS	314	static inline bool fib4_rule_default(const struct fib_rule *rule)
	315	{
	316	return true;
	317	}
	318
1b2a4440 IS	319	static inline int fib4_rules_dump(struct net net, struct notifier_block nb)
	320	{
	321	return 0;
	322	}
	323
	324	static inline unsigned int fib4_rules_seq_read(struct net *net)
	325	{
	326	return 0;
	327	}
	328
e37b1e97 RP	329	static inline bool fib4_rules_early_flow_dissect(struct net *net,
	330	struct sk_buff *skb,
	331	struct flowi4 *fl4,
	332	struct flow_keys *flkeys)
	333	{
	334	return false;
	335	}
1da177e4	336	#else /* CONFIG_IP_MULTIPLE_TABLES */
5c3a0fd7 JP	337	int __net_init fib4_rules_init(struct net *net);
5c3a0fd7 JP	338	void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	339
5c3a0fd7 JP	340	struct fib_table fib_new_table(struct net net, u32 id);
5c3a0fd7 JP	341	struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	342
0eeb075f AG	343	int __fib_lookup(struct net net, struct flowi4 flp,
0eeb075f AG	344	struct fib_result *res, unsigned int flags);
f4530fa5 DM	345
f4530fa5 DM	346	static inline int fib_lookup(struct net net, struct flowi4 flp,
0eeb075f	347	struct fib_result *res, unsigned int flags)
f4530fa5	348	{
a7e53531	349	struct fib_table *tb;
0315e382	350	int err = -ENETUNREACH;
a7e53531	351
0eeb075f	352	flags \|= FIB_LOOKUP_NOREF;
a7e53531	353	if (net->ipv4.fib_has_custom_rules)
0eeb075f	354	return __fib_lookup(net, flp, res, flags);
a7e53531 AD	355
	356	rcu_read_lock();
	357
	358	res->tclassid = 0;
	359
0315e382 NF	360	tb = rcu_dereference_rtnl(net->ipv4.fib_main);
	361	if (tb)
	362	err = fib_table_lookup(tb, flp, res, flags);
	363
	364	if (!err)
	365	goto out;
	366
	367	tb = rcu_dereference_rtnl(net->ipv4.fib_default);
	368	if (tb)
	369	err = fib_table_lookup(tb, flp, res, flags);
a7e53531	370
0315e382 NF	371	out:
	372	if (err == -EAGAIN)
	373	err = -ENETUNREACH;
a7e53531 AD	374
	375	rcu_read_unlock();
	376
	377	return err;
f4530fa5 DM	378	}
f4530fa5 DM	379
3c71006d	380	bool fib4_rule_default(const struct fib_rule *rule);
1b2a4440 IS	381	int fib4_rules_dump(struct net net, struct notifier_block nb);
1b2a4440 IS	382	unsigned int fib4_rules_seq_read(struct net *net);
3c71006d	383
e37b1e97 RP	384	static inline bool fib4_rules_early_flow_dissect(struct net *net,
	385	struct sk_buff *skb,
	386	struct flowi4 *fl4,
	387	struct flow_keys *flkeys)
	388	{
	389	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
	390
	391	if (!net->ipv4.fib_rules_require_fldissect)
	392	return false;
	393
	394	skb_flow_dissect_flow_keys(skb, flkeys, flag);
	395	fl4->fl4_sport = flkeys->ports.src;
	396	fl4->fl4_dport = flkeys->ports.dst;
	397	fl4->flowi4_proto = flkeys->basic.ip_proto;
	398
	399	return true;
	400	}
	401
1da177e4 LT	402	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	403
	404	/* Exported by fib_frontend.c */
ef7c79ed	405	extern const struct nla_policy rtm_ipv4_policy[];
5c3a0fd7 JP	406	void ip_fib_init(void);
5c3a0fd7 JP	407	__be32 fib_compute_spec_dst(struct sk_buff *skb);
78f2756c	408	bool fib_info_nh_uses_dev(struct fib_info fi, const struct net_device dev);
5c3a0fd7 JP	409	int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
	410	u8 tos, int oif, struct net_device *dev,
	411	struct in_device idev, u32 itag);
7a9bc9b8	412	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	413	static inline int fib_num_tclassid_users(struct net *net)
	414	{
	415	return net->ipv4.fib_num_tclassid_users;
	416	}
7a9bc9b8	417	#else
f4530fa5 DM	418	static inline int fib_num_tclassid_users(struct net *net)
	419	{
	420	return 0;
	421	}
7a9bc9b8	422	#endif
0ddcf43d	423	int fib_unmerge(struct net *net);
14c85021	424
1da177e4	425	/* Exported by fib_semantics.c */
5c3a0fd7	426	int ip_fib_check_default(__be32 gw, struct net_device *dev);
4f823def	427	int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
5a56a0b3	428	int fib_sync_down_addr(struct net_device *dev, __be32 local);
8a3d0316	429	int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
af7d6cce	430	void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
0e884c78	431
bf4e0a3d	432	#ifdef CONFIG_IP_ROUTE_MULTIPATH
7efc0b6b	433	int fib_multipath_hash(const struct net net, const struct flowi4 fl4,
e37b1e97	434	const struct sk_buff skb, struct flow_keys flkeys);
bf4e0a3d	435	#endif
0e884c78	436	void fib_select_multipath(struct fib_result *res, int hash);
3ce58d84	437	void fib_select_path(struct net net, struct fib_result res,
bf4e0a3d	438	struct flowi4 fl4, const struct sk_buff skb);
1da177e4	439
e4516ef6 DA	440	int fib_nh_init(struct net net, struct fib_nh fib_nh,
	441	struct fib_config *cfg, int nh_weight,
	442	struct netlink_ext_ack *extack);
faa041a4	443	void fib_nh_release(struct net net, struct fib_nh fib_nh);
979e276e DA	444	int fib_nh_common_init(struct fib_nh_common nhc, struct nlattr fc_encap,
	445	u16 fc_encap_type, void *cfg, gfp_t gfp_flags,
	446	struct netlink_ext_ack *extack);
	447	void fib_nh_common_release(struct fib_nh_common *nhc);
e4516ef6	448
5348ba85	449	/* Exported by fib_trie.c */
5c3a0fd7	450	void fib_trie_init(void);
0ddcf43d	451	struct fib_table fib_trie_table(u32 id, struct fib_table alias);
1da177e4	452
b6bf3ca0	453	static inline void fib_combine_itag(u32 itag, const struct fib_result res)
1da177e4	454	{
c7066f70	455	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	456	#ifdef CONFIG_IP_MULTIPLE_TABLES
	457	u32 rtag;
	458	#endif
	459	itag = FIB_RES_NH(res).nh_tclassid<<16;
	460	#ifdef CONFIG_IP_MULTIPLE_TABLES
85b91b03	461	rtag = res->tclassid;
1da177e4 LT	462	if (*itag == 0)
	463	*itag = (rtag<<16);
	464	*itag \|= (rtag>>16);
	465	#endif
	466	#endif
	467	}
	468
5c3a0fd7	469	void free_fib_info(struct fib_info *fi);
1da177e4	470
1c677b3d IS	471	static inline void fib_info_hold(struct fib_info *fi)
1c677b3d IS	472	{
0029c0de	473	refcount_inc(&fi->fib_clntref);
1c677b3d IS	474	}
1c677b3d IS	475
1da177e4 LT	476	static inline void fib_info_put(struct fib_info *fi)
1da177e4 LT	477	{
0029c0de	478	if (refcount_dec_and_test(&fi->fib_clntref))
1da177e4 LT	479	free_fib_info(fi);
	480	}
	481
20380731	482	#ifdef CONFIG_PROC_FS
5c3a0fd7 JP	483	int __net_init fib_proc_init(struct net *net);
5c3a0fd7 JP	484	void __net_exit fib_proc_exit(struct net *net);
cc8274f5 LZ	485	#else
	486	static inline int fib_proc_init(struct net *net)
	487	{
	488	return 0;
	489	}
	490	static inline void fib_proc_exit(struct net *net)
	491	{
	492	}
20380731 ACM	493	#endif
20380731 ACM	494
50d889b1 DA	495	u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
50d889b1 DA	496
4724676d DA	497	int ip_valid_fib_dump_req(struct net net, const struct nlmsghdr nlh,
4724676d DA	498	struct fib_dump_filter *filter,
effe6792	499	struct netlink_callback *cb);
1da177e4	500	#endif /* _NET_FIB_H */