[mirror_ubuntu-hirsute-kernel.git] / include / net / ip_fib.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * 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>
 */

#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;
	u8			fc_gw_family;
	/* 2 bytes unused */
	u32			fc_table;
	__be32			fc_dst;
	union {
		__be32		fc_gw4;
		struct in6_addr	fc_gw6;
	};
	int			fc_oif;
	u32			fc_flags;
	u32			fc_priority;
	__be32			fc_prefsrc;
	u32			fc_nh_id;
	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 char		nhc_scope;
	u8			nhc_family;
	u8			nhc_gw_family;
	unsigned char		nhc_flags;
	struct lwtunnel_state	*nhc_lwtstate;

	union {
		__be32          ipv4;
		struct in6_addr ipv6;
	} nhc_gw;

	int			nhc_weight;
	atomic_t		nhc_upper_bound;

	/* v4 specific, but allows fib6_nh with v4 routes */
	struct rtable __rcu * __percpu *nhc_pcpu_rth_output;
	struct rtable __rcu     *nhc_rth_input;
	struct fnhe_hash_bucket	__rcu *nhc_exceptions;
};

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;
#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_gw_family	nh_common.nhc_gw_family
#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 nexthop;

struct fib_info {
	struct hlist_node	fib_hash;
	struct hlist_node	fib_lhash;
	struct list_head	nh_list;
	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;
	bool			fib_nh_is_v6;
	bool			nh_updated;
	struct nexthop		*nh;
	struct rcu_head		rcu;
	struct fib_nh		fib_nh[];
};


#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_nh_common	*nhc;
	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_MULTIPLE_TABLES
#define FIB_TABLE_HASHSZ 256
#else
#define FIB_TABLE_HASHSZ 2
#endif

__be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc,
				 unsigned char scope);
__be32 fib_result_prefsrc(struct net *net, struct fib_result *res);

#define FIB_RES_NHC(res)		((res).nhc)
#define FIB_RES_DEV(res)	(FIB_RES_NHC(res)->nhc_dev)
#define FIB_RES_OIF(res)	(FIB_RES_NHC(res)->nhc_oif)

struct fib_rt_info {
	struct fib_info		*fi;
	u32			tb_id;
	__be32			dst;
	int			dst_len;
	u8			tos;
	u8			type;
	u8			offload:1,
				trap:1,
				unused:6;
};

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,
		       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_info_notify_update(struct net *net, struct nl_info *info);
int fib_notify(struct net *net, struct notifier_block *nb,
	       struct netlink_ext_ack *extack);

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[];
};

struct fib_dump_filter {
	u32			table_id;
	/* filter_set is an optimization that an entry is set */
	bool			filter_set;
	bool			dump_routes;
	bool			dump_exceptions;
	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_has_custom_rules(const struct net *net)
{
	return false;
}

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,
				  struct netlink_ext_ack *extack)
{
	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;
}

static inline bool fib4_has_custom_rules(const struct net *net)
{
	return net->ipv4.fib_has_custom_rules;
}

bool fib4_rule_default(const struct fib_rule *rule);
int fib4_rules_dump(struct net *net, struct notifier_block *nb,
		    struct netlink_ext_ack *extack);
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);
int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla,
		    struct netlink_ext_ack *extack);
__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);

static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc,
const struct net_device *dev)
{
	if (nhc->nhc_dev == dev ||
	    l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex)
		return true;

	return false;
}

/* 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 char nh_flags);
void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig);

#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
int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope,
		 struct netlink_ext_ack *extack);
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 net *net, 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_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri);
void fib_trie_init(void);
struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags,
			 const struct flowi4 *flp);

static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
{
#ifdef CONFIG_IP_ROUTE_CLASSID
	struct fib_nh_common *nhc = res->nhc;
#ifdef CONFIG_IP_MULTIPLE_TABLES
	u32 rtag;
#endif
	if (nhc->nhc_family == AF_INET) {
		struct fib_nh *nh;

		nh = container_of(nhc, struct fib_nh, nh_common);
		*itag = nh->nh_tclassid << 16;
	} else {
		*itag = 0;
	}

#ifdef CONFIG_IP_MULTIPLE_TABLES
	rtag = res->tclassid;
	if (*itag == 0)
		*itag = (rtag<<16);
	*itag |= (rtag>>16);
#endif
#endif
}

void fib_flush(struct net *net);
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);

int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
		     u8 rt_family, unsigned char *flags, bool skip_oif);
int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,
		    int nh_weight, u8 rt_family);
#endif  /* _NET_FIB_H */
Commit	Line	Data
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4 LT	2	/*
	3	* INET An implementation of the TCP/IP protocol suite for the LINUX
	4	* operating system. INET is implemented using the BSD Socket
	5	* interface as the means of communication with the user level.
	6	*
	7	* Definitions for the Forwarding Information Base.
	8	*
	9	* Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
1da177e4 LT	10	*/
	11
	12	#ifndef _NET_IP_FIB_H
	13	#define _NET_IP_FIB_H
	14
1da177e4 LT	15	#include <net/flow.h>
1da177e4 LT	16	#include <linux/seq_file.h>
4895c771	17	#include <linux/rcupdate.h>
04b1d4e5	18	#include <net/fib_notifier.h>
e1ef4bf2	19	#include <net/fib_rules.h>
8e773277	20	#include <net/inetpeer.h>
d26b3a7c	21	#include <linux/percpu.h>
b90eb754	22	#include <linux/notifier.h>
0029c0de	23	#include <linux/refcount.h>
1da177e4	24
4e902c57	25	struct fib_config {
4e902c57	26	u8 fc_dst_len;
4e902c57 TG	27	u8 fc_tos;
	28	u8 fc_protocol;
	29	u8 fc_scope;
	30	u8 fc_type;
f35b794b DA	31	u8 fc_gw_family;
f35b794b DA	32	/* 2 bytes unused */
4e902c57	33	u32 fc_table;
6d85c10a	34	__be32 fc_dst;
a4ea5d43 DA	35	union {
	36	__be32 fc_gw4;
	37	struct in6_addr fc_gw6;
	38	};
4e902c57 TG	39	int fc_oif;
	40	u32 fc_flags;
	41	u32 fc_priority;
6d85c10a	42	__be32 fc_prefsrc;
493ced1a	43	u32 fc_nh_id;
4e902c57 TG	44	struct nlattr *fc_mx;
	45	struct rtnexthop *fc_mp;
	46	int fc_mx_len;
	47	int fc_mp_len;
	48	u32 fc_flow;
4e902c57 TG	49	u32 fc_nlflags;
4e902c57 TG	50	struct nl_info fc_nlinfo;
571e7226 RP	51	struct nlattr *fc_encap;
	52	u16 fc_encap_type;
	53	};
1da177e4 LT	54
1da177e4 LT	55	struct fib_info;
f2bb4bed	56	struct rtable;
1da177e4	57
4895c771 DM	58	struct fib_nh_exception {
4895c771 DM	59	struct fib_nh_exception __rcu *fnhe_next;
5aad1de5	60	int fnhe_genid;
4895c771 DM	61	__be32 fnhe_daddr;
4895c771 DM	62	u32 fnhe_pmtu;
d52e5a7e	63	bool fnhe_mtu_locked;
aee06da6	64	__be32 fnhe_gw;
4895c771	65	unsigned long fnhe_expires;
2ffae99d TT	66	struct rtable __rcu *fnhe_rth_input;
2ffae99d TT	67	struct rtable __rcu *fnhe_rth_output;
4895c771	68	unsigned long fnhe_stamp;
deed49df	69	struct rcu_head rcu;
4895c771 DM	70	};
	71
	72	struct fnhe_hash_bucket {
	73	struct fib_nh_exception __rcu *chain;
	74	};
	75
d546c621 ED	76	#define FNHE_HASH_SHIFT 11
d546c621 ED	77	#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
4895c771 DM	78	#define FNHE_RECLAIM_DEPTH 5
4895c771 DM	79
f1741730 DA	80	struct fib_nh_common {
	81	struct net_device *nhc_dev;
	82	int nhc_oif;
f1741730 DA	83	unsigned char nhc_scope;
f1741730 DA	84	u8 nhc_family;
bdf00467	85	u8 nhc_gw_family;
ecc5663c DA	86	unsigned char nhc_flags;
ecc5663c DA	87	struct lwtunnel_state *nhc_lwtstate;
bdf00467	88
f1741730 DA	89	union {
	90	__be32 ipv4;
	91	struct in6_addr ipv6;
	92	} nhc_gw;
	93
	94	int nhc_weight;
	95	atomic_t nhc_upper_bound;
0f457a36 DA	96
	97	/* v4 specific, but allows fib6_nh with v4 routes */
	98	struct rtable __rcu * __percpu *nhc_pcpu_rth_output;
	99	struct rtable __rcu *nhc_rth_input;
a5995e71	100	struct fnhe_hash_bucket __rcu *nhc_exceptions;
f1741730 DA	101	};
f1741730 DA	102
1da177e4	103	struct fib_nh {
f1741730	104	struct fib_nh_common nh_common;
1da177e4 LT	105	struct hlist_node nh_hash;
1da177e4 LT	106	struct fib_info *nh_parent;
c7066f70	107	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	108	__u32 nh_tclassid;
1da177e4 LT	109	#endif
1fc050a1	110	__be32 nh_saddr;
436c3b66	111	int nh_saddr_genid;
f1741730 DA	112	#define fib_nh_family nh_common.nhc_family
	113	#define fib_nh_dev nh_common.nhc_dev
	114	#define fib_nh_oif nh_common.nhc_oif
	115	#define fib_nh_flags nh_common.nhc_flags
	116	#define fib_nh_lws nh_common.nhc_lwtstate
	117	#define fib_nh_scope nh_common.nhc_scope
bdf00467	118	#define fib_nh_gw_family nh_common.nhc_gw_family
f1741730 DA	119	#define fib_nh_gw4 nh_common.nhc_gw.ipv4
	120	#define fib_nh_gw6 nh_common.nhc_gw.ipv6
	121	#define fib_nh_weight nh_common.nhc_weight
	122	#define fib_nh_upper_bound nh_common.nhc_upper_bound
1da177e4 LT	123	};
	124
	125	/*
	126	* This structure contains data shared by many of routes.
	127	*/
	128
4c7e8084 DA	129	struct nexthop;
4c7e8084 DA	130
1da177e4 LT	131	struct fib_info {
	132	struct hlist_node fib_hash;
	133	struct hlist_node fib_lhash;
4c7e8084	134	struct list_head nh_list;
7462bd74	135	struct net *fib_net;
1da177e4	136	int fib_treeref;
0029c0de	137	refcount_t fib_clntref;
95c96174	138	unsigned int fib_flags;
37e826c5 DM	139	unsigned char fib_dead;
	140	unsigned char fib_protocol;
	141	unsigned char fib_scope;
f4ef85bb	142	unsigned char fib_type;
b83738ae	143	__be32 fib_prefsrc;
5a56a0b3	144	u32 fib_tb_id;
1da177e4	145	u32 fib_priority;
3fb07daf ED	146	struct dst_metrics *fib_metrics;
	147	#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
	148	#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
	149	#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
	150	#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
1da177e4	151	int fib_nhs;
19a9d136	152	bool fib_nh_is_v6;
1bff1a0c	153	bool nh_updated;
4c7e8084	154	struct nexthop *nh;
ebc0ffae	155	struct rcu_head rcu;
a5311060	156	struct fib_nh fib_nh[];
1da177e4 LT	157	};
	158
	159
	160	#ifdef CONFIG_IP_MULTIPLE_TABLES
	161	struct fib_rule;
	162	#endif
	163
5b470441	164	struct fib_table;
1da177e4	165	struct fib_result {
eba618ab DA	166	__be32 prefix;
	167	unsigned char prefixlen;
	168	unsigned char nh_sel;
	169	unsigned char type;
	170	unsigned char scope;
	171	u32 tclassid;
	172	struct fib_nh_common *nhc;
	173	struct fib_info *fi;
	174	struct fib_table *table;
	175	struct hlist_head *fa_head;
1da177e4 LT	176	};
1da177e4 LT	177
246955fe	178	struct fib_result_nl {
80e856e1	179	__be32 fl_addr; /* To be looked up*/
5f300893	180	u32 fl_mark;
246955fe RO	181	unsigned char fl_tos;
	182	unsigned char fl_scope;
	183	unsigned char tb_id_in;
	184
	185	unsigned char tb_id; /* Results */
	186	unsigned char prefixlen;
	187	unsigned char nh_sel;
	188	unsigned char type;
	189	unsigned char scope;
82695b30	190	int err;
246955fe	191	};
1da177e4	192
5b9e12db	193	#ifdef CONFIG_IP_MULTIPLE_TABLES
93456b6d	194	#define FIB_TABLE_HASHSZ 256
5b9e12db DL	195	#else
	196	#define FIB_TABLE_HASHSZ 2
	197	#endif
1da177e4	198
dcb1ecb5 DA	199	__be32 fib_info_update_nhc_saddr(struct net net, struct fib_nh_common nhc,
dcb1ecb5 DA	200	unsigned char scope);
eba618ab	201	__be32 fib_result_prefsrc(struct net net, struct fib_result res);
436c3b66	202
eba618ab DA	203	#define FIB_RES_NHC(res) ((res).nhc)
	204	#define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev)
	205	#define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif)
1fc050a1	206
1e301fd0 IS	207	struct fib_rt_info {
	208	struct fib_info *fi;
	209	u32 tb_id;
	210	__be32 dst;
	211	int dst_len;
	212	u8 tos;
	213	u8 type;
90b93f1b IS	214	u8 offload:1,
	215	trap:1,
	216	unused:6;
1e301fd0 IS	217	};
1e301fd0 IS	218
b90eb754 JP	219	struct fib_entry_notifier_info {
	220	struct fib_notifier_info info; /* must be first */
	221	u32 dst;
	222	int dst_len;
	223	struct fib_info *fi;
	224	u8 tos;
	225	u8 type;
	226	u32 tb_id;
b90eb754 JP	227	};
b90eb754 JP	228
982acb97 IS	229	struct fib_nh_notifier_info {
	230	struct fib_notifier_info info; /* must be first */
	231	struct fib_nh *fib_nh;
	232	};
	233
7c550daf	234	int call_fib4_notifier(struct notifier_block *nb,
04b1d4e5	235	enum fib_event_type event_type,
b90eb754	236	struct fib_notifier_info *info);
04b1d4e5 IS	237	int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
	238	struct fib_notifier_info *info);
	239
	240	int __net_init fib4_notifier_init(struct net *net);
	241	void __net_exit fib4_notifier_exit(struct net *net);
b90eb754	242
1bff1a0c	243	void fib_info_notify_update(struct net net, struct nl_info info);
b7a59557 JP	244	int fib_notify(struct net net, struct notifier_block nb,
b7a59557 JP	245	struct netlink_ext_ack *extack);
c0243892	246
1da177e4	247	struct fib_table {
8e773277 DM	248	struct hlist_node tb_hlist;
8e773277 DM	249	u32 tb_id;
8e773277	250	int tb_num_default;
a7e53531	251	struct rcu_head rcu;
0ddcf43d	252	unsigned long *tb_data;
a5311060	253	unsigned long __data[];
1da177e4 LT	254	};
1da177e4 LT	255
4724676d DA	256	struct fib_dump_filter {
	257	u32 table_id;
	258	/* filter_set is an optimization that an entry is set */
	259	bool filter_set;
564c91f7 SB	260	bool dump_routes;
564c91f7 SB	261	bool dump_exceptions;
4724676d DA	262	unsigned char protocol;
	263	unsigned char rt_type;
	264	unsigned int flags;
	265	struct net_device *dev;
	266	};
	267
5c3a0fd7 JP	268	int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
5c3a0fd7 JP	269	struct fib_result *res, int fib_flags);
6d8422a1 DA	270	int fib_table_insert(struct net , struct fib_table , struct fib_config *,
6d8422a1 DA	271	struct netlink_ext_ack *extack);
78055998 DA	272	int fib_table_delete(struct net , struct fib_table , struct fib_config *,
78055998 DA	273	struct netlink_ext_ack *extack);
5c3a0fd7	274	int fib_table_dump(struct fib_table table, struct sk_buff skb,
18a8021a	275	struct netlink_callback cb, struct fib_dump_filter filter);
f97f4dd8	276	int fib_table_flush(struct net net, struct fib_table table, bool flush_all);
0ddcf43d	277	struct fib_table fib_trie_unmerge(struct fib_table main_tb);
3b709334	278	void fib_table_flush_external(struct fib_table *table);
5c3a0fd7	279	void fib_free_table(struct fib_table *tb);
4aa2c466	280
1da177e4 LT	281	#ifndef CONFIG_IP_MULTIPLE_TABLES
1da177e4 LT	282
a5a519b2 AD	283	#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
a5a519b2 AD	284	#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
1da177e4	285
8ad4942c	286	static inline struct fib_table fib_get_table(struct net net, u32 id)
1da177e4	287	{
a7e53531	288	struct hlist_node *tb_hlist;
93456b6d DL	289	struct hlist_head *ptr;
	290
	291	ptr = id == RT_TABLE_LOCAL ?
e4aef8ae DL	292	&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
e4aef8ae DL	293	&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
a7e53531 AD	294
	295	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
	296
	297	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
1da177e4 LT	298	}
1da177e4 LT	299
8ad4942c	300	static inline struct fib_table fib_new_table(struct net net, u32 id)
1da177e4	301	{
8ad4942c	302	return fib_get_table(net, id);
1da177e4 LT	303	}
1da177e4 LT	304
22bd5b9b	305	static inline int fib_lookup(struct net net, const struct flowi4 flp,
0eeb075f	306	struct fib_result *res, unsigned int flags)
1da177e4	307	{
a7e53531	308	struct fib_table *tb;
0ddcf43d	309	int err = -ENETUNREACH;
345e9b54 AD	310
	311	rcu_read_lock();
	312
0ddcf43d	313	tb = fib_get_table(net, RT_TABLE_MAIN);
0315e382 NF	314	if (tb)
	315	err = fib_table_lookup(tb, flp, res, flags \| FIB_LOOKUP_NOREF);
	316
	317	if (err == -EAGAIN)
	318	err = -ENETUNREACH;
93456b6d	319
345e9b54	320	rcu_read_unlock();
93456b6d	321
345e9b54	322	return err;
1da177e4 LT	323	}
1da177e4 LT	324
c43c3d76 PA	325	static inline bool fib4_has_custom_rules(const struct net *net)
	326	{
	327	return false;
	328	}
	329
3c71006d IS	330	static inline bool fib4_rule_default(const struct fib_rule *rule)
	331	{
	332	return true;
	333	}
	334
b7a59557 JP	335	static inline int fib4_rules_dump(struct net net, struct notifier_block nb,
b7a59557 JP	336	struct netlink_ext_ack *extack)
1b2a4440 IS	337	{
	338	return 0;
	339	}
	340
	341	static inline unsigned int fib4_rules_seq_read(struct net *net)
	342	{
	343	return 0;
	344	}
	345
e37b1e97 RP	346	static inline bool fib4_rules_early_flow_dissect(struct net *net,
	347	struct sk_buff *skb,
	348	struct flowi4 *fl4,
	349	struct flow_keys *flkeys)
	350	{
	351	return false;
	352	}
1da177e4	353	#else /* CONFIG_IP_MULTIPLE_TABLES */
5c3a0fd7 JP	354	int __net_init fib4_rules_init(struct net *net);
5c3a0fd7 JP	355	void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	356
5c3a0fd7 JP	357	struct fib_table fib_new_table(struct net net, u32 id);
5c3a0fd7 JP	358	struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	359
0eeb075f AG	360	int __fib_lookup(struct net net, struct flowi4 flp,
0eeb075f AG	361	struct fib_result *res, unsigned int flags);
f4530fa5 DM	362
f4530fa5 DM	363	static inline int fib_lookup(struct net net, struct flowi4 flp,
0eeb075f	364	struct fib_result *res, unsigned int flags)
f4530fa5	365	{
a7e53531	366	struct fib_table *tb;
0315e382	367	int err = -ENETUNREACH;
a7e53531	368
0eeb075f	369	flags \|= FIB_LOOKUP_NOREF;
a7e53531	370	if (net->ipv4.fib_has_custom_rules)
0eeb075f	371	return __fib_lookup(net, flp, res, flags);
a7e53531 AD	372
	373	rcu_read_lock();
	374
	375	res->tclassid = 0;
	376
0315e382 NF	377	tb = rcu_dereference_rtnl(net->ipv4.fib_main);
	378	if (tb)
	379	err = fib_table_lookup(tb, flp, res, flags);
	380
	381	if (!err)
	382	goto out;
	383
	384	tb = rcu_dereference_rtnl(net->ipv4.fib_default);
	385	if (tb)
	386	err = fib_table_lookup(tb, flp, res, flags);
a7e53531	387
0315e382 NF	388	out:
	389	if (err == -EAGAIN)
	390	err = -ENETUNREACH;
a7e53531 AD	391
	392	rcu_read_unlock();
	393
	394	return err;
f4530fa5 DM	395	}
f4530fa5 DM	396
c43c3d76 PA	397	static inline bool fib4_has_custom_rules(const struct net *net)
	398	{
	399	return net->ipv4.fib_has_custom_rules;
	400	}
	401
3c71006d	402	bool fib4_rule_default(const struct fib_rule *rule);
b7a59557 JP	403	int fib4_rules_dump(struct net net, struct notifier_block nb,
b7a59557 JP	404	struct netlink_ext_ack *extack);
1b2a4440	405	unsigned int fib4_rules_seq_read(struct net *net);
3c71006d	406
e37b1e97 RP	407	static inline bool fib4_rules_early_flow_dissect(struct net *net,
	408	struct sk_buff *skb,
	409	struct flowi4 *fl4,
	410	struct flow_keys *flkeys)
	411	{
	412	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
	413
	414	if (!net->ipv4.fib_rules_require_fldissect)
	415	return false;
	416
	417	skb_flow_dissect_flow_keys(skb, flkeys, flag);
	418	fl4->fl4_sport = flkeys->ports.src;
	419	fl4->fl4_dport = flkeys->ports.dst;
	420	fl4->flowi4_proto = flkeys->basic.ip_proto;
	421
	422	return true;
	423	}
	424
1da177e4 LT	425	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	426
	427	/* Exported by fib_frontend.c */
ef7c79ed	428	extern const struct nla_policy rtm_ipv4_policy[];
5c3a0fd7	429	void ip_fib_init(void);
d1566268 DA	430	int fib_gw_from_via(struct fib_config cfg, struct nlattr nla,
d1566268 DA	431	struct netlink_ext_ack *extack);
5c3a0fd7	432	__be32 fib_compute_spec_dst(struct sk_buff *skb);
78f2756c	433	bool fib_info_nh_uses_dev(struct fib_info fi, const struct net_device dev);
5c3a0fd7 JP	434	int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
	435	u8 tos, int oif, struct net_device *dev,
	436	struct in_device idev, u32 itag);
7a9bc9b8	437	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	438	static inline int fib_num_tclassid_users(struct net *net)
	439	{
	440	return net->ipv4.fib_num_tclassid_users;
	441	}
7a9bc9b8	442	#else
f4530fa5 DM	443	static inline int fib_num_tclassid_users(struct net *net)
	444	{
	445	return 0;
	446	}
7a9bc9b8	447	#endif
0ddcf43d	448	int fib_unmerge(struct net *net);
14c85021	449
1fd1c768 DA	450	static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc,
	451	const struct net_device *dev)
	452	{
	453	if (nhc->nhc_dev == dev \|\|
	454	l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex)
	455	return true;
	456
	457	return false;
	458	}
	459
1da177e4	460	/* Exported by fib_semantics.c */
5c3a0fd7	461	int ip_fib_check_default(__be32 gw, struct net_device *dev);
4f823def	462	int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
5a56a0b3	463	int fib_sync_down_addr(struct net_device *dev, __be32 local);
ecc5663c	464	int fib_sync_up(struct net_device *dev, unsigned char nh_flags);
af7d6cce	465	void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
06c77c3e	466	void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig);
0e884c78	467
bf4e0a3d	468	#ifdef CONFIG_IP_ROUTE_MULTIPATH
7efc0b6b	469	int fib_multipath_hash(const struct net net, const struct flowi4 fl4,
e37b1e97	470	const struct sk_buff skb, struct flow_keys flkeys);
bf4e0a3d	471	#endif
ac1fab2d DA	472	int fib_check_nh(struct net net, struct fib_nh nh, u32 table, u8 scope,
ac1fab2d DA	473	struct netlink_ext_ack *extack);
0e884c78	474	void fib_select_multipath(struct fib_result *res, int hash);
3ce58d84	475	void fib_select_path(struct net net, struct fib_result res,
bf4e0a3d	476	struct flowi4 fl4, const struct sk_buff skb);
1da177e4	477
e4516ef6 DA	478	int fib_nh_init(struct net net, struct fib_nh fib_nh,
	479	struct fib_config *cfg, int nh_weight,
	480	struct netlink_ext_ack *extack);
faa041a4	481	void fib_nh_release(struct net net, struct fib_nh fib_nh);
faee6769 AA	482	int fib_nh_common_init(struct net net, struct fib_nh_common nhc,
	483	struct nlattr *fc_encap, u16 fc_encap_type,
	484	void *cfg, gfp_t gfp_flags,
979e276e DA	485	struct netlink_ext_ack *extack);
979e276e DA	486	void fib_nh_common_release(struct fib_nh_common *nhc);
e4516ef6	487
5348ba85	488	/* Exported by fib_trie.c */
90b93f1b	489	void fib_alias_hw_flags_set(struct net net, const struct fib_rt_info fri);
5c3a0fd7	490	void fib_trie_init(void);
0ddcf43d	491	struct fib_table fib_trie_table(u32 id, struct fib_table alias);
af7888ad DA	492	bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags,
af7888ad DA	493	const struct flowi4 *flp);
1da177e4	494
b6bf3ca0	495	static inline void fib_combine_itag(u32 itag, const struct fib_result res)
1da177e4	496	{
c7066f70	497	#ifdef CONFIG_IP_ROUTE_CLASSID
eba618ab	498	struct fib_nh_common *nhc = res->nhc;
1da177e4 LT	499	#ifdef CONFIG_IP_MULTIPLE_TABLES
	500	u32 rtag;
	501	#endif
dcb1ecb5 DA	502	if (nhc->nhc_family == AF_INET) {
	503	struct fib_nh *nh;
	504
	505	nh = container_of(nhc, struct fib_nh, nh_common);
	506	*itag = nh->nh_tclassid << 16;
	507	} else {
	508	*itag = 0;
	509	}
	510
1da177e4	511	#ifdef CONFIG_IP_MULTIPLE_TABLES
85b91b03	512	rtag = res->tclassid;
1da177e4 LT	513	if (*itag == 0)
	514	*itag = (rtag<<16);
	515	*itag \|= (rtag>>16);
	516	#endif
	517	#endif
	518	}
	519
9bd83667	520	void fib_flush(struct net *net);
5c3a0fd7	521	void free_fib_info(struct fib_info *fi);
1da177e4	522
1c677b3d IS	523	static inline void fib_info_hold(struct fib_info *fi)
1c677b3d IS	524	{
0029c0de	525	refcount_inc(&fi->fib_clntref);
1c677b3d IS	526	}
1c677b3d IS	527
1da177e4 LT	528	static inline void fib_info_put(struct fib_info *fi)
1da177e4 LT	529	{
0029c0de	530	if (refcount_dec_and_test(&fi->fib_clntref))
1da177e4 LT	531	free_fib_info(fi);
	532	}
	533
20380731	534	#ifdef CONFIG_PROC_FS
5c3a0fd7 JP	535	int __net_init fib_proc_init(struct net *net);
5c3a0fd7 JP	536	void __net_exit fib_proc_exit(struct net *net);
cc8274f5 LZ	537	#else
	538	static inline int fib_proc_init(struct net *net)
	539	{
	540	return 0;
	541	}
	542	static inline void fib_proc_exit(struct net *net)
	543	{
	544	}
20380731 ACM	545	#endif
20380731 ACM	546
50d889b1 DA	547	u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
50d889b1 DA	548
4724676d DA	549	int ip_valid_fib_dump_req(struct net net, const struct nlmsghdr nlh,
4724676d DA	550	struct fib_dump_filter *filter,
effe6792	551	struct netlink_callback *cb);
c0a72077 DA	552
c0a72077 DA	553	int fib_nexthop_info(struct sk_buff skb, const struct fib_nh_common nh,
7bdf4de1	554	u8 rt_family, unsigned char *flags, bool skip_oif);
c0a72077	555	int fib_add_nexthop(struct sk_buff skb, const struct fib_nh_common nh,
7bdf4de1	556	int nh_weight, u8 rt_family);
1da177e4	557	#endif /* _NET_FIB_H */