[linux-block.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/inet_dscp.h>
#include <net/inetpeer.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
#include <linux/refcount.h>

struct fib_config {
	u8			fc_dst_len;
	dscp_t			fc_dscp;
	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;
	netdevice_tracker	nhc_dev_tracker;
	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_dev_tracker	nh_common.nhc_dev_tracker
#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;
	refcount_t		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;
	dscp_t			dscp;
	u8			type;
	u8			offload:1,
				trap:1,
				offload_failed:1,
				unused:5;
};

struct fib_entry_notifier_info {
	struct fib_notifier_info info; /* must be first */
	u32 dst;
	int dst_len;
	struct fib_info *fi;
	dscp_t dscp;
	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 atomic_read(&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);

/* Fields used for sysctl_fib_multipath_hash_fields.
 * Common to IPv4 and IPv6.
 *
 * Add new fields at the end. This is user API.
 */
#define FIB_MULTIPATH_HASH_FIELD_SRC_IP			BIT(0)
#define FIB_MULTIPATH_HASH_FIELD_DST_IP			BIT(1)
#define FIB_MULTIPATH_HASH_FIELD_IP_PROTO		BIT(2)
#define FIB_MULTIPATH_HASH_FIELD_FLOWLABEL		BIT(3)
#define FIB_MULTIPATH_HASH_FIELD_SRC_PORT		BIT(4)
#define FIB_MULTIPATH_HASH_FIELD_DST_PORT		BIT(5)
#define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP		BIT(6)
#define FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP		BIT(7)
#define FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO		BIT(8)
#define FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL	BIT(9)
#define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT		BIT(10)
#define FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT		BIT(11)

#define FIB_MULTIPATH_HASH_FIELD_OUTER_MASK		\
	(FIB_MULTIPATH_HASH_FIELD_SRC_IP |		\
	 FIB_MULTIPATH_HASH_FIELD_DST_IP |		\
	 FIB_MULTIPATH_HASH_FIELD_IP_PROTO |		\
	 FIB_MULTIPATH_HASH_FIELD_FLOWLABEL |		\
	 FIB_MULTIPATH_HASH_FIELD_SRC_PORT |		\
	 FIB_MULTIPATH_HASH_FIELD_DST_PORT)

#define FIB_MULTIPATH_HASH_FIELD_INNER_MASK		\
	(FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP |	\
	 FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP |	\
	 FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO |	\
	 FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL |	\
	 FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT |	\
	 FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT)

#define FIB_MULTIPATH_HASH_FIELD_ALL_MASK		\
	(FIB_MULTIPATH_HASH_FIELD_OUTER_MASK |		\
	 FIB_MULTIPATH_HASH_FIELD_INNER_MASK)

#define FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK		\
	(FIB_MULTIPATH_HASH_FIELD_SRC_IP |		\
	 FIB_MULTIPATH_HASH_FIELD_DST_IP |		\
	 FIB_MULTIPATH_HASH_FIELD_IP_PROTO)

#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, u32 nh_tclassid);
#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>
f55fbb6a	20	#include <net/inet_dscp.h>
8e773277	21	#include <net/inetpeer.h>
d26b3a7c	22	#include <linux/percpu.h>
b90eb754	23	#include <linux/notifier.h>
0029c0de	24	#include <linux/refcount.h>
1da177e4	25
4e902c57	26	struct fib_config {
4e902c57	27	u8 fc_dst_len;
f55fbb6a	28	dscp_t fc_dscp;
4e902c57 TG	29	u8 fc_protocol;
	30	u8 fc_scope;
	31	u8 fc_type;
f35b794b DA	32	u8 fc_gw_family;
f35b794b DA	33	/* 2 bytes unused */
4e902c57	34	u32 fc_table;
6d85c10a	35	__be32 fc_dst;
a4ea5d43 DA	36	union {
	37	__be32 fc_gw4;
	38	struct in6_addr fc_gw6;
	39	};
4e902c57 TG	40	int fc_oif;
	41	u32 fc_flags;
	42	u32 fc_priority;
6d85c10a	43	__be32 fc_prefsrc;
493ced1a	44	u32 fc_nh_id;
4e902c57 TG	45	struct nlattr *fc_mx;
	46	struct rtnexthop *fc_mp;
	47	int fc_mx_len;
	48	int fc_mp_len;
	49	u32 fc_flow;
4e902c57 TG	50	u32 fc_nlflags;
4e902c57 TG	51	struct nl_info fc_nlinfo;
571e7226 RP	52	struct nlattr *fc_encap;
	53	u16 fc_encap_type;
	54	};
1da177e4 LT	55
1da177e4 LT	56	struct fib_info;
f2bb4bed	57	struct rtable;
1da177e4	58
4895c771 DM	59	struct fib_nh_exception {
4895c771 DM	60	struct fib_nh_exception __rcu *fnhe_next;
5aad1de5	61	int fnhe_genid;
4895c771 DM	62	__be32 fnhe_daddr;
4895c771 DM	63	u32 fnhe_pmtu;
d52e5a7e	64	bool fnhe_mtu_locked;
aee06da6	65	__be32 fnhe_gw;
4895c771	66	unsigned long fnhe_expires;
2ffae99d TT	67	struct rtable __rcu *fnhe_rth_input;
2ffae99d TT	68	struct rtable __rcu *fnhe_rth_output;
4895c771	69	unsigned long fnhe_stamp;
deed49df	70	struct rcu_head rcu;
4895c771 DM	71	};
	72
	73	struct fnhe_hash_bucket {
	74	struct fib_nh_exception __rcu *chain;
	75	};
	76
d546c621 ED	77	#define FNHE_HASH_SHIFT 11
d546c621 ED	78	#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
4895c771 DM	79	#define FNHE_RECLAIM_DEPTH 5
4895c771 DM	80
f1741730 DA	81	struct fib_nh_common {
f1741730 DA	82	struct net_device *nhc_dev;
e44b14eb	83	netdevice_tracker nhc_dev_tracker;
f1741730	84	int nhc_oif;
f1741730 DA	85	unsigned char nhc_scope;
f1741730 DA	86	u8 nhc_family;
bdf00467	87	u8 nhc_gw_family;
ecc5663c DA	88	unsigned char nhc_flags;
ecc5663c DA	89	struct lwtunnel_state *nhc_lwtstate;
bdf00467	90
f1741730 DA	91	union {
	92	__be32 ipv4;
	93	struct in6_addr ipv6;
	94	} nhc_gw;
	95
	96	int nhc_weight;
	97	atomic_t nhc_upper_bound;
0f457a36 DA	98
	99	/* v4 specific, but allows fib6_nh with v4 routes */
	100	struct rtable __rcu * __percpu *nhc_pcpu_rth_output;
	101	struct rtable __rcu *nhc_rth_input;
a5995e71	102	struct fnhe_hash_bucket __rcu *nhc_exceptions;
f1741730 DA	103	};
f1741730 DA	104
1da177e4	105	struct fib_nh {
f1741730	106	struct fib_nh_common nh_common;
1da177e4 LT	107	struct hlist_node nh_hash;
1da177e4 LT	108	struct fib_info *nh_parent;
c7066f70	109	#ifdef CONFIG_IP_ROUTE_CLASSID
1da177e4 LT	110	__u32 nh_tclassid;
1da177e4 LT	111	#endif
1fc050a1	112	__be32 nh_saddr;
436c3b66	113	int nh_saddr_genid;
f1741730 DA	114	#define fib_nh_family nh_common.nhc_family
f1741730 DA	115	#define fib_nh_dev nh_common.nhc_dev
e44b14eb	116	#define fib_nh_dev_tracker nh_common.nhc_dev_tracker
f1741730 DA	117	#define fib_nh_oif nh_common.nhc_oif
	118	#define fib_nh_flags nh_common.nhc_flags
	119	#define fib_nh_lws nh_common.nhc_lwtstate
	120	#define fib_nh_scope nh_common.nhc_scope
bdf00467	121	#define fib_nh_gw_family nh_common.nhc_gw_family
f1741730 DA	122	#define fib_nh_gw4 nh_common.nhc_gw.ipv4
	123	#define fib_nh_gw6 nh_common.nhc_gw.ipv6
	124	#define fib_nh_weight nh_common.nhc_weight
	125	#define fib_nh_upper_bound nh_common.nhc_upper_bound
1da177e4 LT	126	};
	127
	128	/*
	129	* This structure contains data shared by many of routes.
	130	*/
	131
4c7e8084 DA	132	struct nexthop;
4c7e8084 DA	133
1da177e4 LT	134	struct fib_info {
	135	struct hlist_node fib_hash;
	136	struct hlist_node fib_lhash;
4c7e8084	137	struct list_head nh_list;
7462bd74	138	struct net *fib_net;
79976892	139	refcount_t fib_treeref;
0029c0de	140	refcount_t fib_clntref;
95c96174	141	unsigned int fib_flags;
37e826c5 DM	142	unsigned char fib_dead;
	143	unsigned char fib_protocol;
	144	unsigned char fib_scope;
f4ef85bb	145	unsigned char fib_type;
b83738ae	146	__be32 fib_prefsrc;
5a56a0b3	147	u32 fib_tb_id;
1da177e4	148	u32 fib_priority;
3fb07daf ED	149	struct dst_metrics *fib_metrics;
	150	#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
	151	#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
	152	#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
	153	#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
1da177e4	154	int fib_nhs;
19a9d136	155	bool fib_nh_is_v6;
1bff1a0c	156	bool nh_updated;
4c7e8084	157	struct nexthop *nh;
ebc0ffae	158	struct rcu_head rcu;
a5311060	159	struct fib_nh fib_nh[];
1da177e4 LT	160	};
	161
	162
	163	#ifdef CONFIG_IP_MULTIPLE_TABLES
	164	struct fib_rule;
	165	#endif
	166
5b470441	167	struct fib_table;
1da177e4	168	struct fib_result {
eba618ab DA	169	__be32 prefix;
	170	unsigned char prefixlen;
	171	unsigned char nh_sel;
	172	unsigned char type;
	173	unsigned char scope;
	174	u32 tclassid;
	175	struct fib_nh_common *nhc;
	176	struct fib_info *fi;
	177	struct fib_table *table;
	178	struct hlist_head *fa_head;
1da177e4 LT	179	};
1da177e4 LT	180
246955fe	181	struct fib_result_nl {
80e856e1	182	__be32 fl_addr; /* To be looked up*/
5f300893	183	u32 fl_mark;
246955fe RO	184	unsigned char fl_tos;
	185	unsigned char fl_scope;
	186	unsigned char tb_id_in;
	187
	188	unsigned char tb_id; /* Results */
	189	unsigned char prefixlen;
	190	unsigned char nh_sel;
	191	unsigned char type;
	192	unsigned char scope;
82695b30	193	int err;
246955fe	194	};
1da177e4	195
5b9e12db	196	#ifdef CONFIG_IP_MULTIPLE_TABLES
93456b6d	197	#define FIB_TABLE_HASHSZ 256
5b9e12db DL	198	#else
	199	#define FIB_TABLE_HASHSZ 2
	200	#endif
1da177e4	201
dcb1ecb5 DA	202	__be32 fib_info_update_nhc_saddr(struct net net, struct fib_nh_common nhc,
dcb1ecb5 DA	203	unsigned char scope);
eba618ab	204	__be32 fib_result_prefsrc(struct net net, struct fib_result res);
436c3b66	205
eba618ab DA	206	#define FIB_RES_NHC(res) ((res).nhc)
	207	#define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev)
	208	#define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif)
1fc050a1	209
1e301fd0 IS	210	struct fib_rt_info {
	211	struct fib_info *fi;
	212	u32 tb_id;
	213	__be32 dst;
	214	int dst_len;
888ade8f	215	dscp_t dscp;
1e301fd0	216	u8 type;
90b93f1b IS	217	u8 offload:1,
90b93f1b IS	218	trap:1,
36c5100e AC	219	offload_failed:1,
36c5100e AC	220	unused:5;
1e301fd0 IS	221	};
1e301fd0 IS	222
b90eb754 JP	223	struct fib_entry_notifier_info {
	224	struct fib_notifier_info info; /* must be first */
	225	u32 dst;
	226	int dst_len;
	227	struct fib_info *fi;
568a3f33	228	dscp_t dscp;
b90eb754 JP	229	u8 type;
b90eb754 JP	230	u32 tb_id;
b90eb754 JP	231	};
b90eb754 JP	232
982acb97 IS	233	struct fib_nh_notifier_info {
	234	struct fib_notifier_info info; /* must be first */
	235	struct fib_nh *fib_nh;
	236	};
	237
7c550daf	238	int call_fib4_notifier(struct notifier_block *nb,
04b1d4e5	239	enum fib_event_type event_type,
b90eb754	240	struct fib_notifier_info *info);
04b1d4e5 IS	241	int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
	242	struct fib_notifier_info *info);
	243
	244	int __net_init fib4_notifier_init(struct net *net);
	245	void __net_exit fib4_notifier_exit(struct net *net);
b90eb754	246
1bff1a0c	247	void fib_info_notify_update(struct net net, struct nl_info info);
b7a59557 JP	248	int fib_notify(struct net net, struct notifier_block nb,
b7a59557 JP	249	struct netlink_ext_ack *extack);
c0243892	250
1da177e4	251	struct fib_table {
8e773277 DM	252	struct hlist_node tb_hlist;
8e773277 DM	253	u32 tb_id;
8e773277	254	int tb_num_default;
a7e53531	255	struct rcu_head rcu;
0ddcf43d	256	unsigned long *tb_data;
a5311060	257	unsigned long __data[];
1da177e4 LT	258	};
1da177e4 LT	259
4724676d DA	260	struct fib_dump_filter {
	261	u32 table_id;
	262	/* filter_set is an optimization that an entry is set */
	263	bool filter_set;
564c91f7 SB	264	bool dump_routes;
564c91f7 SB	265	bool dump_exceptions;
4724676d DA	266	unsigned char protocol;
	267	unsigned char rt_type;
	268	unsigned int flags;
	269	struct net_device *dev;
	270	};
	271
5c3a0fd7 JP	272	int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
5c3a0fd7 JP	273	struct fib_result *res, int fib_flags);
6d8422a1 DA	274	int fib_table_insert(struct net , struct fib_table , struct fib_config *,
6d8422a1 DA	275	struct netlink_ext_ack *extack);
78055998 DA	276	int fib_table_delete(struct net , struct fib_table , struct fib_config *,
78055998 DA	277	struct netlink_ext_ack *extack);
5c3a0fd7	278	int fib_table_dump(struct fib_table table, struct sk_buff skb,
18a8021a	279	struct netlink_callback cb, struct fib_dump_filter filter);
f97f4dd8	280	int fib_table_flush(struct net net, struct fib_table table, bool flush_all);
0ddcf43d	281	struct fib_table fib_trie_unmerge(struct fib_table main_tb);
3b709334	282	void fib_table_flush_external(struct fib_table *table);
5c3a0fd7	283	void fib_free_table(struct fib_table *tb);
4aa2c466	284
1da177e4 LT	285	#ifndef CONFIG_IP_MULTIPLE_TABLES
1da177e4 LT	286
a5a519b2 AD	287	#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
a5a519b2 AD	288	#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
1da177e4	289
8ad4942c	290	static inline struct fib_table fib_get_table(struct net net, u32 id)
1da177e4	291	{
a7e53531	292	struct hlist_node *tb_hlist;
93456b6d DL	293	struct hlist_head *ptr;
	294
	295	ptr = id == RT_TABLE_LOCAL ?
e4aef8ae DL	296	&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
e4aef8ae DL	297	&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
a7e53531 AD	298
	299	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
	300
	301	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
1da177e4 LT	302	}
1da177e4 LT	303
8ad4942c	304	static inline struct fib_table fib_new_table(struct net net, u32 id)
1da177e4	305	{
8ad4942c	306	return fib_get_table(net, id);
1da177e4 LT	307	}
1da177e4 LT	308
22bd5b9b	309	static inline int fib_lookup(struct net net, const struct flowi4 flp,
0eeb075f	310	struct fib_result *res, unsigned int flags)
1da177e4	311	{
a7e53531	312	struct fib_table *tb;
0ddcf43d	313	int err = -ENETUNREACH;
345e9b54 AD	314
	315	rcu_read_lock();
	316
0ddcf43d	317	tb = fib_get_table(net, RT_TABLE_MAIN);
0315e382 NF	318	if (tb)
	319	err = fib_table_lookup(tb, flp, res, flags \| FIB_LOOKUP_NOREF);
	320
	321	if (err == -EAGAIN)
	322	err = -ENETUNREACH;
93456b6d	323
345e9b54	324	rcu_read_unlock();
93456b6d	325
345e9b54	326	return err;
1da177e4 LT	327	}
1da177e4 LT	328
c43c3d76 PA	329	static inline bool fib4_has_custom_rules(const struct net *net)
	330	{
	331	return false;
	332	}
	333
3c71006d IS	334	static inline bool fib4_rule_default(const struct fib_rule *rule)
	335	{
	336	return true;
	337	}
	338
b7a59557 JP	339	static inline int fib4_rules_dump(struct net net, struct notifier_block nb,
b7a59557 JP	340	struct netlink_ext_ack *extack)
1b2a4440 IS	341	{
	342	return 0;
	343	}
	344
	345	static inline unsigned int fib4_rules_seq_read(struct net *net)
	346	{
	347	return 0;
	348	}
	349
e37b1e97 RP	350	static inline bool fib4_rules_early_flow_dissect(struct net *net,
	351	struct sk_buff *skb,
	352	struct flowi4 *fl4,
	353	struct flow_keys *flkeys)
	354	{
	355	return false;
	356	}
1da177e4	357	#else /* CONFIG_IP_MULTIPLE_TABLES */
5c3a0fd7 JP	358	int __net_init fib4_rules_init(struct net *net);
5c3a0fd7 JP	359	void __net_exit fib4_rules_exit(struct net *net);
c3e9a353	360
5c3a0fd7 JP	361	struct fib_table fib_new_table(struct net net, u32 id);
5c3a0fd7 JP	362	struct fib_table fib_get_table(struct net net, u32 id);
1da177e4	363
0eeb075f AG	364	int __fib_lookup(struct net net, struct flowi4 flp,
0eeb075f AG	365	struct fib_result *res, unsigned int flags);
f4530fa5 DM	366
f4530fa5 DM	367	static inline int fib_lookup(struct net net, struct flowi4 flp,
0eeb075f	368	struct fib_result *res, unsigned int flags)
f4530fa5	369	{
a7e53531	370	struct fib_table *tb;
0315e382	371	int err = -ENETUNREACH;
a7e53531	372
0eeb075f	373	flags \|= FIB_LOOKUP_NOREF;
a7e53531	374	if (net->ipv4.fib_has_custom_rules)
0eeb075f	375	return __fib_lookup(net, flp, res, flags);
a7e53531 AD	376
	377	rcu_read_lock();
	378
	379	res->tclassid = 0;
	380
0315e382 NF	381	tb = rcu_dereference_rtnl(net->ipv4.fib_main);
	382	if (tb)
	383	err = fib_table_lookup(tb, flp, res, flags);
	384
	385	if (!err)
	386	goto out;
	387
	388	tb = rcu_dereference_rtnl(net->ipv4.fib_default);
	389	if (tb)
	390	err = fib_table_lookup(tb, flp, res, flags);
a7e53531	391
0315e382 NF	392	out:
	393	if (err == -EAGAIN)
	394	err = -ENETUNREACH;
a7e53531 AD	395
	396	rcu_read_unlock();
	397
	398	return err;
f4530fa5 DM	399	}
f4530fa5 DM	400
c43c3d76 PA	401	static inline bool fib4_has_custom_rules(const struct net *net)
	402	{
	403	return net->ipv4.fib_has_custom_rules;
	404	}
	405
3c71006d	406	bool fib4_rule_default(const struct fib_rule *rule);
b7a59557 JP	407	int fib4_rules_dump(struct net net, struct notifier_block nb,
b7a59557 JP	408	struct netlink_ext_ack *extack);
1b2a4440	409	unsigned int fib4_rules_seq_read(struct net *net);
3c71006d	410
e37b1e97 RP	411	static inline bool fib4_rules_early_flow_dissect(struct net *net,
	412	struct sk_buff *skb,
	413	struct flowi4 *fl4,
	414	struct flow_keys *flkeys)
	415	{
	416	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
	417
	418	if (!net->ipv4.fib_rules_require_fldissect)
	419	return false;
	420
	421	skb_flow_dissect_flow_keys(skb, flkeys, flag);
	422	fl4->fl4_sport = flkeys->ports.src;
	423	fl4->fl4_dport = flkeys->ports.dst;
	424	fl4->flowi4_proto = flkeys->basic.ip_proto;
	425
	426	return true;
	427	}
	428
1da177e4 LT	429	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	430
	431	/* Exported by fib_frontend.c */
ef7c79ed	432	extern const struct nla_policy rtm_ipv4_policy[];
5c3a0fd7	433	void ip_fib_init(void);
d1566268 DA	434	int fib_gw_from_via(struct fib_config cfg, struct nlattr nla,
d1566268 DA	435	struct netlink_ext_ack *extack);
5c3a0fd7	436	__be32 fib_compute_spec_dst(struct sk_buff *skb);
78f2756c	437	bool fib_info_nh_uses_dev(struct fib_info fi, const struct net_device dev);
5c3a0fd7 JP	438	int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
	439	u8 tos, int oif, struct net_device *dev,
	440	struct in_device idev, u32 itag);
7a9bc9b8	441	#ifdef CONFIG_IP_ROUTE_CLASSID
f4530fa5 DM	442	static inline int fib_num_tclassid_users(struct net *net)
f4530fa5 DM	443	{
213f5f8f	444	return atomic_read(&net->ipv4.fib_num_tclassid_users);
f4530fa5	445	}
7a9bc9b8	446	#else
f4530fa5 DM	447	static inline int fib_num_tclassid_users(struct net *net)
	448	{
	449	return 0;
	450	}
7a9bc9b8	451	#endif
0ddcf43d	452	int fib_unmerge(struct net *net);
14c85021	453
1fd1c768 DA	454	static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc,
	455	const struct net_device *dev)
	456	{
	457	if (nhc->nhc_dev == dev \|\|
	458	l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex)
	459	return true;
	460
	461	return false;
	462	}
	463
1da177e4	464	/* Exported by fib_semantics.c */
5c3a0fd7	465	int ip_fib_check_default(__be32 gw, struct net_device *dev);
4f823def	466	int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
5a56a0b3	467	int fib_sync_down_addr(struct net_device *dev, __be32 local);
ecc5663c	468	int fib_sync_up(struct net_device *dev, unsigned char nh_flags);
af7d6cce	469	void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
06c77c3e	470	void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig);
0e884c78	471
ce5c9c20 IS	472	/* Fields used for sysctl_fib_multipath_hash_fields.
	473	* Common to IPv4 and IPv6.
	474	*
	475	* Add new fields at the end. This is user API.
	476	*/
	477	#define FIB_MULTIPATH_HASH_FIELD_SRC_IP BIT(0)
	478	#define FIB_MULTIPATH_HASH_FIELD_DST_IP BIT(1)
	479	#define FIB_MULTIPATH_HASH_FIELD_IP_PROTO BIT(2)
	480	#define FIB_MULTIPATH_HASH_FIELD_FLOWLABEL BIT(3)
	481	#define FIB_MULTIPATH_HASH_FIELD_SRC_PORT BIT(4)
	482	#define FIB_MULTIPATH_HASH_FIELD_DST_PORT BIT(5)
	483	#define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP BIT(6)
	484	#define FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP BIT(7)
	485	#define FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO BIT(8)
	486	#define FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL BIT(9)
	487	#define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT BIT(10)
	488	#define FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT BIT(11)
	489
	490	#define FIB_MULTIPATH_HASH_FIELD_OUTER_MASK \
	491	(FIB_MULTIPATH_HASH_FIELD_SRC_IP \| \
	492	FIB_MULTIPATH_HASH_FIELD_DST_IP \| \
	493	FIB_MULTIPATH_HASH_FIELD_IP_PROTO \| \
	494	FIB_MULTIPATH_HASH_FIELD_FLOWLABEL \| \
	495	FIB_MULTIPATH_HASH_FIELD_SRC_PORT \| \
	496	FIB_MULTIPATH_HASH_FIELD_DST_PORT)
	497
	498	#define FIB_MULTIPATH_HASH_FIELD_INNER_MASK \
	499	(FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP \| \
	500	FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP \| \
	501	FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO \| \
	502	FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL \| \
	503	FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT \| \
	504	FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT)
	505
	506	#define FIB_MULTIPATH_HASH_FIELD_ALL_MASK \
	507	(FIB_MULTIPATH_HASH_FIELD_OUTER_MASK \| \
	508	FIB_MULTIPATH_HASH_FIELD_INNER_MASK)
	509
	510	#define FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK \
	511	(FIB_MULTIPATH_HASH_FIELD_SRC_IP \| \
	512	FIB_MULTIPATH_HASH_FIELD_DST_IP \| \
	513	FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
	514
bf4e0a3d	515	#ifdef CONFIG_IP_ROUTE_MULTIPATH
7efc0b6b	516	int fib_multipath_hash(const struct net net, const struct flowi4 fl4,
e37b1e97	517	const struct sk_buff skb, struct flow_keys flkeys);
bf4e0a3d	518	#endif
ac1fab2d DA	519	int fib_check_nh(struct net net, struct fib_nh nh, u32 table, u8 scope,
ac1fab2d DA	520	struct netlink_ext_ack *extack);
0e884c78	521	void fib_select_multipath(struct fib_result *res, int hash);
3ce58d84	522	void fib_select_path(struct net net, struct fib_result res,
bf4e0a3d	523	struct flowi4 fl4, const struct sk_buff skb);
1da177e4	524
e4516ef6 DA	525	int fib_nh_init(struct net net, struct fib_nh fib_nh,
	526	struct fib_config *cfg, int nh_weight,
	527	struct netlink_ext_ack *extack);
faa041a4	528	void fib_nh_release(struct net net, struct fib_nh fib_nh);
faee6769 AA	529	int fib_nh_common_init(struct net net, struct fib_nh_common nhc,
	530	struct nlattr *fc_encap, u16 fc_encap_type,
	531	void *cfg, gfp_t gfp_flags,
979e276e DA	532	struct netlink_ext_ack *extack);
979e276e DA	533	void fib_nh_common_release(struct fib_nh_common *nhc);
e4516ef6	534
5348ba85	535	/* Exported by fib_trie.c */
90b93f1b	536	void fib_alias_hw_flags_set(struct net net, const struct fib_rt_info fri);
5c3a0fd7	537	void fib_trie_init(void);
0ddcf43d	538	struct fib_table fib_trie_table(u32 id, struct fib_table alias);
af7888ad DA	539	bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags,
af7888ad DA	540	const struct flowi4 *flp);
1da177e4	541
b6bf3ca0	542	static inline void fib_combine_itag(u32 itag, const struct fib_result res)
1da177e4	543	{
c7066f70	544	#ifdef CONFIG_IP_ROUTE_CLASSID
eba618ab	545	struct fib_nh_common *nhc = res->nhc;
1da177e4 LT	546	#ifdef CONFIG_IP_MULTIPLE_TABLES
	547	u32 rtag;
	548	#endif
dcb1ecb5 DA	549	if (nhc->nhc_family == AF_INET) {
	550	struct fib_nh *nh;
	551
	552	nh = container_of(nhc, struct fib_nh, nh_common);
	553	*itag = nh->nh_tclassid << 16;
	554	} else {
	555	*itag = 0;
	556	}
	557
1da177e4	558	#ifdef CONFIG_IP_MULTIPLE_TABLES
85b91b03	559	rtag = res->tclassid;
1da177e4 LT	560	if (*itag == 0)
	561	*itag = (rtag<<16);
	562	*itag \|= (rtag>>16);
	563	#endif
	564	#endif
	565	}
	566
9bd83667	567	void fib_flush(struct net *net);
5c3a0fd7	568	void free_fib_info(struct fib_info *fi);
1da177e4	569
1c677b3d IS	570	static inline void fib_info_hold(struct fib_info *fi)
1c677b3d IS	571	{
0029c0de	572	refcount_inc(&fi->fib_clntref);
1c677b3d IS	573	}
1c677b3d IS	574
1da177e4 LT	575	static inline void fib_info_put(struct fib_info *fi)
1da177e4 LT	576	{
0029c0de	577	if (refcount_dec_and_test(&fi->fib_clntref))
1da177e4 LT	578	free_fib_info(fi);
	579	}
	580
20380731	581	#ifdef CONFIG_PROC_FS
5c3a0fd7 JP	582	int __net_init fib_proc_init(struct net *net);
5c3a0fd7 JP	583	void __net_exit fib_proc_exit(struct net *net);
cc8274f5 LZ	584	#else
	585	static inline int fib_proc_init(struct net *net)
	586	{
	587	return 0;
	588	}
	589	static inline void fib_proc_exit(struct net *net)
	590	{
	591	}
20380731 ACM	592	#endif
20380731 ACM	593
50d889b1 DA	594	u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
50d889b1 DA	595
4724676d DA	596	int ip_valid_fib_dump_req(struct net net, const struct nlmsghdr nlh,
4724676d DA	597	struct fib_dump_filter *filter,
effe6792	598	struct netlink_callback *cb);
c0a72077 DA	599
c0a72077 DA	600	int fib_nexthop_info(struct sk_buff skb, const struct fib_nh_common nh,
7bdf4de1	601	u8 rt_family, unsigned char *flags, bool skip_oif);
c0a72077	602	int fib_add_nexthop(struct sk_buff skb, const struct fib_nh_common nh,
597aa16c	603	int nh_weight, u8 rt_family, u32 nh_tclassid);
1da177e4	604	#endif /* _NET_FIB_H */