/* * 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> /* WARNING: The ordering of these elements must match ordering *          of RTA_* rtnetlink attribute numbers. */struct kern_rta {	void		*rta_dst;	void		*rta_src;	int		*rta_iif;	int		*rta_oif;	void		*rta_gw;	u32		*rta_priority;	void		*rta_prefsrc;	struct rtattr	*rta_mx;	struct rtattr	*rta_mp;	unsigned char	*rta_protoinfo;	u32		*rta_flow;	struct rta_cacheinfo *rta_ci;	struct rta_session *rta_sess;	u32		*rta_mp_alg;}; 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_NET_CLS_ROUTE	__u32			nh_tclassid;#endif	int			nh_oif;	u32			nh_gw;}; /* * This structure contains data shared by many of routes. */ struct fib_info {	struct hlist_node	fib_hash;	struct hlist_node	fib_lhash;	int			fib_treeref;	atomic_t		fib_clntref;	int			fib_dead;	unsigned		fib_flags;	int			fib_protocol;	u32			fib_prefsrc;	u32			fib_priority;	u32			fib_metrics[RTAX_MAX];#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#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED	u32			fib_mp_alg;#endif	struct fib_nh		fib_nh[0];#define fib_dev		fib_nh[0].nh_dev};  #ifdef CONFIG_IP_MULTIPLE_TABLESstruct fib_rule;#endif struct fib_result {	unsigned char	prefixlen;	unsigned char	nh_sel;	unsigned char	type;	unsigned char	scope;#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED	__u32           network;	__u32           netmask;#endif	struct fib_info *fi;#ifdef CONFIG_IP_MULTIPLE_TABLES	struct fib_rule	*r;#endif}; struct fib_result_nl {	u32		fl_addr;   /* To be looked up*/ 	u32		fl_fwmark; 	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_RES_RESET(res)	((res).nh_sel = 0) #else /* CONFIG_IP_ROUTE_MULTIPATH */ #define FIB_RES_NH(res)		((res).fi->fib_nh[0])#define FIB_RES_RESET(res) #endif /* CONFIG_IP_ROUTE_MULTIPATH */ #define FIB_RES_PREFSRC(res)		((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&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) #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED#define FIB_RES_NETWORK(res)		((res).network)#define FIB_RES_NETMASK(res)	        ((res).netmask)#else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */#define FIB_RES_NETWORK(res)		(0)#define FIB_RES_NETMASK(res)	        (0)#endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */ struct fib_table {	unsigned char	tb_id;	unsigned	tb_stamp;	int		(*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);	int		(*tb_insert)(struct fib_table *table, struct rtmsg *r,				     struct kern_rta *rta, struct nlmsghdr *n,				     struct netlink_skb_parms *req);	int		(*tb_delete)(struct fib_table *table, struct rtmsg *r,				     struct kern_rta *rta, struct nlmsghdr *n,				     struct netlink_skb_parms *req);	int		(*tb_dump)(struct fib_table *table, struct sk_buff *skb,				     struct netlink_callback *cb);	int		(*tb_flush)(struct fib_table *table);	void		(*tb_select_default)(struct fib_table *table,					     const struct flowi *flp, struct fib_result *res); 	unsigned char	tb_data[0];}; #ifndef CONFIG_IP_MULTIPLE_TABLES extern struct fib_table *ip_fib_local_table;extern struct fib_table *ip_fib_main_table; static inline struct fib_table *fib_get_table(int id){	if (id != RT_TABLE_LOCAL)		return ip_fib_main_table;	return ip_fib_local_table;} static inline struct fib_table *fib_new_table(int id){	return fib_get_table(id);} static inline int fib_lookup(const struct flowi *flp, struct fib_result *res){	if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&	    ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))		return -ENETUNREACH;	return 0;} static inline void fib_select_default(const struct flowi *flp, struct fib_result *res){	if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)		ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);} #else /* CONFIG_IP_MULTIPLE_TABLES */#define ip_fib_local_table (fib_tables[RT_TABLE_LOCAL])#define ip_fib_main_table (fib_tables[RT_TABLE_MAIN]) extern struct fib_table * fib_tables[RT_TABLE_MAX+1];extern int fib_lookup(const struct flowi *flp, struct fib_result *res);extern struct fib_table *__fib_new_table(int id);extern void fib_rule_put(struct fib_rule *r); static inline struct fib_table *fib_get_table(int id){	if (id == 0)		id = RT_TABLE_MAIN; 	return fib_tables[id];} static inline struct fib_table *fib_new_table(int id){	if (id == 0)		id = RT_TABLE_MAIN; 	return fib_tables[id] ? : __fib_new_table(id);} extern void fib_select_default(const struct flowi *flp, struct fib_result *res); #endif /* CONFIG_IP_MULTIPLE_TABLES */ /* Exported by fib_frontend.c */extern void		ip_fib_init(void);extern int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);extern int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);extern int inet_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);extern int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb);extern int fib_validate_source(u32 src, u32 dst, u8 tos, int oif,			       struct net_device *dev, u32 *spec_dst, u32 *itag);extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res); struct rtentry; /* Exported by fib_semantics.c */extern int ip_fib_check_default(u32 gw, struct net_device *dev);extern int fib_sync_down(u32 local, struct net_device *dev, int force);extern int fib_sync_up(struct net_device *dev);extern int fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,			       struct kern_rta *rta, struct rtentry *r);extern u32  __fib_res_prefsrc(struct fib_result *res); /* Exported by fib_hash.c */extern struct fib_table *fib_hash_init(int id); #ifdef CONFIG_IP_MULTIPLE_TABLES/* Exported by fib_rules.c */ extern int inet_rtm_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);extern int inet_rtm_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);extern int inet_dump_rules(struct sk_buff *skb, struct netlink_callback *cb);#ifdef CONFIG_NET_CLS_ROUTEextern u32 fib_rules_tclass(struct fib_result *res);#endifextern void fib_rules_init(void);#endif static inline void fib_combine_itag(u32 *itag, struct fib_result *res){#ifdef CONFIG_NET_CLS_ROUTE#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);} static inline void fib_res_put(struct fib_result *res){	if (res->fi)		fib_info_put(res->fi);#ifdef CONFIG_IP_MULTIPLE_TABLES	if (res->r)		fib_rule_put(res->r);#endif} #ifdef CONFIG_PROC_FSextern int  fib_proc_init(void);extern void fib_proc_exit(void);#endif #endif  /* _NET_FIB_H */