/* * INET		An implementation of the TCP/IP protocol suite for the LINUX *		operating system.  INET  is implemented using the  BSD Socket *		interface as the means of communication with the user level. * *		Definitions for the Forwarding Information Base. * * Authors:	A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru> * *		This program is free software; you can redistribute it and/or *		modify it under the terms of the GNU General Public License *		as published by the Free Software Foundation; either version *		2 of the License, or (at your option) any later version. */ #ifndef _NET_IP_FIB_H#define _NET_IP_FIB_H #include <net/flow.h>#include <linux/seq_file.h>#include <linux/rcupdate.h>#include <net/fib_rules.h>#include <net/inetpeer.h>#include <linux/percpu.h>#include <linux/notifier.h>#include <linux/refcount.h> struct fib_config {	u8			fc_dst_len;	u8			fc_tos;	u8			fc_protocol;	u8			fc_scope;	u8			fc_type;	/* 3 bytes unused */	u32			fc_table;	__be32			fc_dst;	__be32			fc_gw;	int			fc_oif;	u32			fc_flags;	u32			fc_priority;	__be32			fc_prefsrc;	struct nlattr		*fc_mx;	struct rtnexthop	*fc_mp;	int			fc_mx_len;	int			fc_mp_len;	u32			fc_flow;	u32			fc_nlflags;	struct nl_info		fc_nlinfo;	struct nlattr		*fc_encap;	u16			fc_encap_type;}; struct fib_info;struct rtable; struct fib_nh_exception {	struct fib_nh_exception __rcu	*fnhe_next;	int				fnhe_genid;	__be32				fnhe_daddr;	u32				fnhe_pmtu;	__be32				fnhe_gw;	unsigned long			fnhe_expires;	struct rtable __rcu		*fnhe_rth_input;	struct rtable __rcu		*fnhe_rth_output;	unsigned long			fnhe_stamp;	struct rcu_head			rcu;}; struct fnhe_hash_bucket {	struct fib_nh_exception __rcu	*chain;}; #define FNHE_HASH_SHIFT		11#define FNHE_HASH_SIZE		(1 << FNHE_HASH_SHIFT)#define FNHE_RECLAIM_DEPTH	5 struct fib_nh {	struct net_device	*nh_dev;	struct hlist_node	nh_hash;	struct fib_info		*nh_parent;	unsigned int		nh_flags;	unsigned char		nh_scope;#ifdef CONFIG_IP_ROUTE_MULTIPATH	int			nh_weight;	atomic_t		nh_upper_bound;#endif#ifdef CONFIG_IP_ROUTE_CLASSID	__u32			nh_tclassid;#endif	int			nh_oif;	__be32			nh_gw;	__be32			nh_saddr;	int			nh_saddr_genid;	struct rtable __rcu * __percpu *nh_pcpu_rth_output;	struct rtable __rcu	*nh_rth_input;	struct fnhe_hash_bucket	__rcu *nh_exceptions;	struct lwtunnel_state	*nh_lwtstate;}; /* * This structure contains data shared by many of routes. */ struct fib_info {	struct hlist_node	fib_hash;	struct hlist_node	fib_lhash;	struct net		*fib_net;	int			fib_treeref;	refcount_t		fib_clntref;	unsigned int		fib_flags;	unsigned char		fib_dead;	unsigned char		fib_protocol;	unsigned char		fib_scope;	unsigned char		fib_type;	__be32			fib_prefsrc;	u32			fib_tb_id;	u32			fib_priority;	struct dst_metrics	*fib_metrics;#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]	int			fib_nhs;#ifdef CONFIG_IP_ROUTE_MULTIPATH	int			fib_weight;#endif	unsigned int		fib_offload_cnt;	struct rcu_head		rcu;	struct fib_nh		fib_nh[0];#define fib_dev		fib_nh[0].nh_dev};  #ifdef CONFIG_IP_MULTIPLE_TABLESstruct fib_rule;#endif struct fib_table;struct fib_result {	__be32		prefix;	unsigned char	prefixlen;	unsigned char	nh_sel;	unsigned char	type;	unsigned char	scope;	u32		tclassid;	struct fib_info *fi;	struct fib_table *table;	struct hlist_head *fa_head;}; struct fib_result_nl {	__be32		fl_addr;   /* To be looked up*/	u32		fl_mark;	unsigned char	fl_tos;	unsigned char   fl_scope;	unsigned char   tb_id_in; 	unsigned char   tb_id;      /* Results */	unsigned char	prefixlen;	unsigned char	nh_sel;	unsigned char	type;	unsigned char	scope;	int             err;      }; #ifdef CONFIG_IP_ROUTE_MULTIPATH#define FIB_RES_NH(res)		((res).fi->fib_nh[(res).nh_sel])#else /* CONFIG_IP_ROUTE_MULTIPATH */#define FIB_RES_NH(res)		((res).fi->fib_nh[0])#endif /* CONFIG_IP_ROUTE_MULTIPATH */ #ifdef CONFIG_IP_MULTIPLE_TABLES#define FIB_TABLE_HASHSZ 256#else#define FIB_TABLE_HASHSZ 2#endif __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); static inline void fib_info_offload_inc(struct fib_info *fi){	fi->fib_offload_cnt++;	fi->fib_flags |= RTNH_F_OFFLOAD;} static inline void fib_info_offload_dec(struct fib_info *fi){	if (--fi->fib_offload_cnt == 0)		fi->fib_flags &= ~RTNH_F_OFFLOAD;} #define FIB_RES_SADDR(net, res)				\	((FIB_RES_NH(res).nh_saddr_genid ==		\	  atomic_read(&(net)->ipv4.dev_addr_genid)) ?	\	 FIB_RES_NH(res).nh_saddr :			\	 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))#define FIB_RES_GW(res)			(FIB_RES_NH(res).nh_gw)#define FIB_RES_DEV(res)		(FIB_RES_NH(res).nh_dev)#define FIB_RES_OIF(res)		(FIB_RES_NH(res).nh_oif) #define FIB_RES_PREFSRC(net, res)	((res).fi->fib_prefsrc ? : \					 FIB_RES_SADDR(net, res)) struct fib_notifier_info {	struct net *net;}; struct fib_entry_notifier_info {	struct fib_notifier_info info; /* must be first */	u32 dst;	int dst_len;	struct fib_info *fi;	u8 tos;	u8 type;	u32 tb_id;}; struct fib_rule_notifier_info {	struct fib_notifier_info info; /* must be first */	struct fib_rule *rule;}; struct fib_nh_notifier_info {	struct fib_notifier_info info; /* must be first */	struct fib_nh *fib_nh;}; enum fib_event_type {	FIB_EVENT_ENTRY_REPLACE,	FIB_EVENT_ENTRY_APPEND,	FIB_EVENT_ENTRY_ADD,	FIB_EVENT_ENTRY_DEL,	FIB_EVENT_RULE_ADD,	FIB_EVENT_RULE_DEL,	FIB_EVENT_NH_ADD,	FIB_EVENT_NH_DEL,}; int register_fib_notifier(struct notifier_block *nb,			  void (*cb)(struct notifier_block *nb));int unregister_fib_notifier(struct notifier_block *nb);int call_fib_notifier(struct notifier_block *nb, struct net *net,		      enum fib_event_type event_type,		      struct fib_notifier_info *info);int call_fib_notifiers(struct net *net, enum fib_event_type event_type,		       struct fib_notifier_info *info); void fib_notify(struct net *net, struct notifier_block *nb);#ifdef CONFIG_IP_MULTIPLE_TABLESvoid fib_rules_notify(struct net *net, struct notifier_block *nb);#elsestatic inline void fib_rules_notify(struct net *net, struct notifier_block *nb){}#endif struct fib_table {	struct hlist_node	tb_hlist;	u32			tb_id;	int			tb_num_default;	struct rcu_head		rcu;	unsigned long 		*tb_data;	unsigned long		__data[0];}; int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,		     struct fib_result *res, int fib_flags);int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,		     struct netlink_ext_ack *extack);int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,		     struct netlink_ext_ack *extack);int fib_table_dump(struct fib_table *table, struct sk_buff *skb,		   struct netlink_callback *cb);int fib_table_flush(struct net *net, struct fib_table *table);struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);void fib_table_flush_external(struct fib_table *table);void fib_free_table(struct fib_table *tb); #ifndef CONFIG_IP_MULTIPLE_TABLES #define TABLE_LOCAL_INDEX	(RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))#define TABLE_MAIN_INDEX	(RT_TABLE_MAIN  & (FIB_TABLE_HASHSZ - 1)) static inline struct fib_table *fib_get_table(struct net *net, u32 id){	struct hlist_node *tb_hlist;	struct hlist_head *ptr; 	ptr = id == RT_TABLE_LOCAL ?		&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :		&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; 	tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); 	return hlist_entry(tb_hlist, struct fib_table, tb_hlist);} static inline struct fib_table *fib_new_table(struct net *net, u32 id){	return fib_get_table(net, id);} static inline int fib_lookup(struct net *net, const struct flowi4 *flp,			     struct fib_result *res, unsigned int flags){	struct fib_table *tb;	int err = -ENETUNREACH; 	rcu_read_lock(); 	tb = fib_get_table(net, RT_TABLE_MAIN);	if (tb)		err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); 	if (err == -EAGAIN)		err = -ENETUNREACH; 	rcu_read_unlock(); 	return err;} static inline bool fib4_rule_default(const struct fib_rule *rule){	return true;} #else /* CONFIG_IP_MULTIPLE_TABLES */int __net_init fib4_rules_init(struct net *net);void __net_exit fib4_rules_exit(struct net *net); struct fib_table *fib_new_table(struct net *net, u32 id);struct fib_table *fib_get_table(struct net *net, u32 id); int __fib_lookup(struct net *net, struct flowi4 *flp,		 struct fib_result *res, unsigned int flags); static inline int fib_lookup(struct net *net, struct flowi4 *flp,			     struct fib_result *res, unsigned int flags){	struct fib_table *tb;	int err = -ENETUNREACH; 	flags |= FIB_LOOKUP_NOREF;	if (net->ipv4.fib_has_custom_rules)		return __fib_lookup(net, flp, res, flags); 	rcu_read_lock(); 	res->tclassid = 0; 	tb = rcu_dereference_rtnl(net->ipv4.fib_main);	if (tb)		err = fib_table_lookup(tb, flp, res, flags); 	if (!err)		goto out; 	tb = rcu_dereference_rtnl(net->ipv4.fib_default);	if (tb)		err = fib_table_lookup(tb, flp, res, flags); out:	if (err == -EAGAIN)		err = -ENETUNREACH; 	rcu_read_unlock(); 	return err;} bool fib4_rule_default(const struct fib_rule *rule); #endif /* CONFIG_IP_MULTIPLE_TABLES */ /* Exported by fib_frontend.c */extern const struct nla_policy rtm_ipv4_policy[];void ip_fib_init(void);__be32 fib_compute_spec_dst(struct sk_buff *skb);int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,			u8 tos, int oif, struct net_device *dev,			struct in_device *idev, u32 *itag);#ifdef CONFIG_IP_ROUTE_CLASSIDstatic inline int fib_num_tclassid_users(struct net *net){	return net->ipv4.fib_num_tclassid_users;}#elsestatic inline int fib_num_tclassid_users(struct net *net){	return 0;}#endifint fib_unmerge(struct net *net); /* Exported by fib_semantics.c */int ip_fib_check_default(__be32 gw, struct net_device *dev);int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);int fib_sync_down_addr(struct net_device *dev, __be32 local);int fib_sync_up(struct net_device *dev, unsigned int nh_flags); #ifdef CONFIG_IP_ROUTE_MULTIPATHint fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4,		       const struct sk_buff *skb);#endifvoid fib_select_multipath(struct fib_result *res, int hash);void fib_select_path(struct net *net, struct fib_result *res,		     struct flowi4 *fl4, const struct sk_buff *skb); /* Exported by fib_trie.c */void fib_trie_init(void);struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); static inline void fib_combine_itag(u32 *itag, const struct fib_result *res){#ifdef CONFIG_IP_ROUTE_CLASSID#ifdef CONFIG_IP_MULTIPLE_TABLES	u32 rtag;#endif	*itag = FIB_RES_NH(*res).nh_tclassid<<16;#ifdef CONFIG_IP_MULTIPLE_TABLES	rtag = res->tclassid;	if (*itag == 0)		*itag = (rtag<<16);	*itag |= (rtag>>16);#endif#endif} void free_fib_info(struct fib_info *fi); static inline void fib_info_hold(struct fib_info *fi){	refcount_inc(&fi->fib_clntref);} static inline void fib_info_put(struct fib_info *fi){	if (refcount_dec_and_test(&fi->fib_clntref))		free_fib_info(fi);} #ifdef CONFIG_PROC_FSint __net_init fib_proc_init(struct net *net);void __net_exit fib_proc_exit(struct net *net);#elsestatic inline int fib_proc_init(struct net *net){	return 0;}static inline void fib_proc_exit(struct net *net){}#endif #endif  /* _NET_FIB_H */