/* * 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 <net/fib_rules.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 fib_info; struct fib_nh {	struct net_device	*nh_dev;	struct hlist_node	nh_hash;	struct fib_info		*nh_parent;	unsigned		nh_flags;	unsigned char		nh_scope;#ifdef CONFIG_IP_ROUTE_MULTIPATH	int			nh_weight;	int			nh_power;#endif#ifdef CONFIG_IP_ROUTE_CLASSID	__u32			nh_tclassid;#endif	int			nh_oif;	__be32			nh_gw;	__be32			nh_saddr;	int			nh_saddr_genid;}; /* * 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;	atomic_t		fib_clntref;	unsigned		fib_flags;	unsigned char		fib_dead;	unsigned char		fib_protocol;	unsigned char		fib_scope;	__be32			fib_prefsrc;	u32			fib_priority;	u32			*fib_metrics;#define fib_mtu fib_metrics[RTAX_MTU-1]#define fib_window fib_metrics[RTAX_WINDOW-1]#define fib_rtt fib_metrics[RTAX_RTT-1]#define fib_advmss fib_metrics[RTAX_ADVMSS-1]	int			fib_nhs;#ifdef CONFIG_IP_ROUTE_MULTIPATH	int			fib_power;#endif	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 {	unsigned char	prefixlen;	unsigned char	nh_sel;	unsigned char	type;	unsigned char	scope;	struct fib_info *fi;	struct fib_table *table;	struct list_head *fa_head;#ifdef CONFIG_IP_MULTIPLE_TABLES	struct fib_rule	*r;#endif}; 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]) #define FIB_TABLE_HASHSZ 2 #else /* CONFIG_IP_ROUTE_MULTIPATH */ #define FIB_RES_NH(res)		((res).fi->fib_nh[0]) #define FIB_TABLE_HASHSZ 256 #endif /* CONFIG_IP_ROUTE_MULTIPATH */ extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); #define FIB_RES_SADDR(net, res)				\	((FIB_RES_NH(res).nh_saddr_genid ==		\	  atomic_read(&(net)->ipv4.dev_addr_genid)) ?	\	 FIB_RES_NH(res).nh_saddr :			\	 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))#define FIB_RES_GW(res)			(FIB_RES_NH(res).nh_gw)#define FIB_RES_DEV(res)		(FIB_RES_NH(res).nh_dev)#define FIB_RES_OIF(res)		(FIB_RES_NH(res).nh_oif) #define FIB_RES_PREFSRC(net, res)	((res).fi->fib_prefsrc ? : \					 FIB_RES_SADDR(net, res)) struct fib_table {	struct hlist_node tb_hlist;	u32		tb_id;	int		tb_default;	int		tb_num_default;	unsigned long	tb_data[0];}; extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,			    struct fib_result *res, int fib_flags);extern int fib_table_insert(struct fib_table *, struct fib_config *);extern int fib_table_delete(struct fib_table *, struct fib_config *);extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,			  struct netlink_callback *cb);extern int fib_table_flush(struct fib_table *table);extern void fib_free_table(struct fib_table *tb);   #ifndef CONFIG_IP_MULTIPLE_TABLES #define TABLE_LOCAL_INDEX	0#define TABLE_MAIN_INDEX	1 static inline struct fib_table *fib_get_table(struct net *net, u32 id){	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];	return hlist_entry(ptr->first, 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){	struct fib_table *table; 	table = fib_get_table(net, RT_TABLE_LOCAL);	if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))		return 0; 	table = fib_get_table(net, RT_TABLE_MAIN);	if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))		return 0;	return -ENETUNREACH;} #else /* CONFIG_IP_MULTIPLE_TABLES */extern int __net_init fib4_rules_init(struct net *net);extern void __net_exit fib4_rules_exit(struct net *net); #ifdef CONFIG_IP_ROUTE_CLASSIDextern u32 fib_rules_tclass(const struct fib_result *res);#endif extern int fib_lookup(struct net *n, struct flowi4 *flp, struct fib_result *res); extern struct fib_table *fib_new_table(struct net *net, u32 id);extern struct fib_table *fib_get_table(struct net *net, u32 id); #endif /* CONFIG_IP_MULTIPLE_TABLES */ /* Exported by fib_frontend.c */extern const struct nla_policy rtm_ipv4_policy[];extern void		ip_fib_init(void);extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,			       u8 tos, int oif, struct net_device *dev,			       __be32 *spec_dst, u32 *itag);extern void fib_select_default(struct fib_result *res); /* Exported by fib_semantics.c */extern int ip_fib_check_default(__be32 gw, struct net_device *dev);extern int fib_sync_down_dev(struct net_device *dev, int force);extern int fib_sync_down_addr(struct net *net, __be32 local);extern void fib_update_nh_saddrs(struct net_device *dev);extern int fib_sync_up(struct net_device *dev);extern void fib_select_multipath(struct fib_result *res); /* Exported by fib_trie.c */extern void fib_trie_init(void);extern struct fib_table *fib_trie_table(u32 id); 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 = fib_rules_tclass(res);	if (*itag == 0)		*itag = (rtag<<16);	*itag |= (rtag>>16);#endif#endif} extern void free_fib_info(struct fib_info *fi); static inline void fib_info_put(struct fib_info *fi){	if (atomic_dec_and_test(&fi->fib_clntref))		free_fib_info(fi);} #ifdef CONFIG_PROC_FSextern int __net_init  fib_proc_init(struct net *net);extern 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 */