[net-next-2.6.git] / include / net / ip_fib.h

/*
 * 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_mp_alg;
	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_NET_CLS_ROUTE
	__u32			nh_tclassid;
#endif
	int			nh_oif;
	__be32			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;
	__be32			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_TABLES
struct 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
	__be32          network;
	__be32          netmask;
#endif
	struct fib_info *fi;
#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_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 {
	struct hlist_node tb_hlist;
	u32		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 *, struct fib_config *);
	int		(*tb_delete)(struct fib_table *, struct fib_config *);
	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(u32 id)
{
	if (id != RT_TABLE_LOCAL)
		return ip_fib_main_table;
	return ip_fib_local_table;
}

static inline struct fib_table *fib_new_table(u32 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_get_table(RT_TABLE_LOCAL)
#define ip_fib_main_table fib_get_table(RT_TABLE_MAIN)

extern int fib_lookup(struct flowi *flp, struct fib_result *res);

extern struct fib_table *fib_new_table(u32 id);
extern struct fib_table *fib_get_table(u32 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 struct nla_policy rtm_ipv4_policy[];
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(__be32 src, __be32 dst, u8 tos, int oif,
			       struct net_device *dev, __be32 *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(__be32 gw, struct net_device *dev);
extern int fib_sync_down(__be32 local, struct net_device *dev, int force);
extern int fib_sync_up(struct net_device *dev);
extern __be32  __fib_res_prefsrc(struct fib_result *res);

/* Exported by fib_hash.c */
extern struct fib_table *fib_hash_init(u32 id);

#ifdef CONFIG_IP_MULTIPLE_TABLES
extern int fib4_rules_dump(struct sk_buff *skb, struct netlink_callback *cb);

extern void __init fib4_rules_init(void);

#ifdef CONFIG_NET_CLS_ROUTE
extern u32 fib_rules_tclass(struct fib_result *res);
#endif

#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_FS
extern int  fib_proc_init(void);
extern void fib_proc_exit(void);
#endif

#endif  /* _NET_FIB_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Definitions for the Forwarding Information Base.
	7	*
	8	* Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#ifndef _NET_IP_FIB_H
	17	#define _NET_IP_FIB_H
	18
1da177e4 LT	19	#include <net/flow.h>
1da177e4 LT	20	#include <linux/seq_file.h>
e1ef4bf2	21	#include <net/fib_rules.h>
1da177e4	22
4e902c57	23	struct fib_config {
4e902c57	24	u8 fc_dst_len;
4e902c57 TG	25	u8 fc_tos;
	26	u8 fc_protocol;
	27	u8 fc_scope;
	28	u8 fc_type;
b52f070c	29	/* 3 bytes unused */
4e902c57	30	u32 fc_table;
6d85c10a	31	__be32 fc_dst;
6d85c10a	32	__be32 fc_gw;
4e902c57 TG	33	int fc_oif;
	34	u32 fc_flags;
	35	u32 fc_priority;
6d85c10a	36	__be32 fc_prefsrc;
4e902c57 TG	37	struct nlattr *fc_mx;
	38	struct rtnexthop *fc_mp;
	39	int fc_mx_len;
	40	int fc_mp_len;
	41	u32 fc_flow;
	42	u32 fc_mp_alg;
	43	u32 fc_nlflags;
	44	struct nl_info fc_nlinfo;
	45	};
1da177e4 LT	46
	47	struct fib_info;
	48
	49	struct fib_nh {
	50	struct net_device *nh_dev;
	51	struct hlist_node nh_hash;
	52	struct fib_info *nh_parent;
	53	unsigned nh_flags;
	54	unsigned char nh_scope;
	55	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	56	int nh_weight;
	57	int nh_power;
	58	#endif
	59	#ifdef CONFIG_NET_CLS_ROUTE
	60	__u32 nh_tclassid;
	61	#endif
	62	int nh_oif;
ed49e3ca	63	__be32 nh_gw;
1da177e4 LT	64	};
	65
	66	/*
	67	* This structure contains data shared by many of routes.
	68	*/
	69
	70	struct fib_info {
	71	struct hlist_node fib_hash;
	72	struct hlist_node fib_lhash;
	73	int fib_treeref;
	74	atomic_t fib_clntref;
	75	int fib_dead;
	76	unsigned fib_flags;
	77	int fib_protocol;
b83738ae	78	__be32 fib_prefsrc;
1da177e4 LT	79	u32 fib_priority;
	80	u32 fib_metrics[RTAX_MAX];
	81	#define fib_mtu fib_metrics[RTAX_MTU-1]
	82	#define fib_window fib_metrics[RTAX_WINDOW-1]
	83	#define fib_rtt fib_metrics[RTAX_RTT-1]
	84	#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
	85	int fib_nhs;
	86	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	87	int fib_power;
	88	#endif
	89	#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
	90	u32 fib_mp_alg;
	91	#endif
	92	struct fib_nh fib_nh[0];
	93	#define fib_dev fib_nh[0].nh_dev
	94	};
	95
	96
	97	#ifdef CONFIG_IP_MULTIPLE_TABLES
	98	struct fib_rule;
	99	#endif
	100
	101	struct fib_result {
	102	unsigned char prefixlen;
	103	unsigned char nh_sel;
	104	unsigned char type;
	105	unsigned char scope;
	106	#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
80e856e1 AV	107	__be32 network;
80e856e1 AV	108	__be32 netmask;
1da177e4 LT	109	#endif
	110	struct fib_info *fi;
	111	#ifdef CONFIG_IP_MULTIPLE_TABLES
	112	struct fib_rule *r;
	113	#endif
	114	};
	115
246955fe	116	struct fib_result_nl {
80e856e1	117	__be32 fl_addr; /* To be looked up*/
5f300893	118	u32 fl_mark;
246955fe RO	119	unsigned char fl_tos;
	120	unsigned char fl_scope;
	121	unsigned char tb_id_in;
	122
	123	unsigned char tb_id; /* Results */
	124	unsigned char prefixlen;
	125	unsigned char nh_sel;
	126	unsigned char type;
	127	unsigned char scope;
	128	int err;
	129	};
1da177e4 LT	130
	131	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	132
	133	#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
	134	#define FIB_RES_RESET(res) ((res).nh_sel = 0)
	135
	136	#else /* CONFIG_IP_ROUTE_MULTIPATH */
	137
	138	#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
	139	#define FIB_RES_RESET(res)
	140
	141	#endif /* CONFIG_IP_ROUTE_MULTIPATH */
	142
	143	#define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
	144	#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
	145	#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
	146	#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
	147
	148	#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
	149	#define FIB_RES_NETWORK(res) ((res).network)
	150	#define FIB_RES_NETMASK(res) ((res).netmask)
	151	#else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
	152	#define FIB_RES_NETWORK(res) (0)
	153	#define FIB_RES_NETMASK(res) (0)
	154	#endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */
	155
	156	struct fib_table {
1af5a8c4	157	struct hlist_node tb_hlist;
2dfe55b4	158	u32 tb_id;
1da177e4 LT	159	unsigned tb_stamp;
1da177e4 LT	160	int (tb_lookup)(struct fib_table tb, const struct flowi flp, struct fib_result res);
4e902c57 TG	161	int (tb_insert)(struct fib_table , struct fib_config *);
4e902c57 TG	162	int (tb_delete)(struct fib_table , struct fib_config *);
1da177e4 LT	163	int (tb_dump)(struct fib_table table, struct sk_buff *skb,
	164	struct netlink_callback *cb);
	165	int (tb_flush)(struct fib_table table);
	166	void (tb_select_default)(struct fib_table table,
	167	const struct flowi flp, struct fib_result res);
	168
	169	unsigned char tb_data[0];
	170	};
	171
	172	#ifndef CONFIG_IP_MULTIPLE_TABLES
	173
	174	extern struct fib_table *ip_fib_local_table;
	175	extern struct fib_table *ip_fib_main_table;
	176
2dfe55b4	177	static inline struct fib_table *fib_get_table(u32 id)
1da177e4 LT	178	{
	179	if (id != RT_TABLE_LOCAL)
	180	return ip_fib_main_table;
	181	return ip_fib_local_table;
	182	}
	183
2dfe55b4	184	static inline struct fib_table *fib_new_table(u32 id)
1da177e4 LT	185	{
	186	return fib_get_table(id);
	187	}
	188
	189	static inline int fib_lookup(const struct flowi flp, struct fib_result res)
	190	{
	191	if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
	192	ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
	193	return -ENETUNREACH;
	194	return 0;
	195	}
	196
	197	static inline void fib_select_default(const struct flowi flp, struct fib_result res)
	198	{
	199	if (FIB_RES_GW(res) && FIB_RES_NH(res).nh_scope == RT_SCOPE_LINK)
	200	ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
	201	}
	202
	203	#else /* CONFIG_IP_MULTIPLE_TABLES */
1af5a8c4 PM	204	#define ip_fib_local_table fib_get_table(RT_TABLE_LOCAL)
1af5a8c4 PM	205	#define ip_fib_main_table fib_get_table(RT_TABLE_MAIN)
1da177e4	206
e1ef4bf2	207	extern int fib_lookup(struct flowi flp, struct fib_result res);
1da177e4	208
1af5a8c4 PM	209	extern struct fib_table *fib_new_table(u32 id);
1af5a8c4 PM	210	extern struct fib_table *fib_get_table(u32 id);
1da177e4 LT	211	extern void fib_select_default(const struct flowi flp, struct fib_result res);
	212
	213	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	214
	215	/* Exported by fib_frontend.c */
d889ce3b	216	extern struct nla_policy rtm_ipv4_policy[];
1da177e4 LT	217	extern void ip_fib_init(void);
	218	extern int inet_rtm_delroute(struct sk_buff skb, struct nlmsghdr nlh, void *arg);
	219	extern int inet_rtm_newroute(struct sk_buff skb, struct nlmsghdr nlh, void *arg);
	220	extern int inet_rtm_getroute(struct sk_buff skb, struct nlmsghdr nlh, void *arg);
	221	extern int inet_dump_fib(struct sk_buff skb, struct netlink_callback cb);
d9c9df8c AV	222	extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
d9c9df8c AV	223	struct net_device dev, __be32 spec_dst, u32 *itag);
1da177e4 LT	224	extern void fib_select_multipath(const struct flowi flp, struct fib_result res);
1da177e4 LT	225
14c85021 ACM	226	struct rtentry;
14c85021 ACM	227
1da177e4	228	/* Exported by fib_semantics.c */
d878e72e	229	extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
81f7bf6c	230	extern int fib_sync_down(__be32 local, struct net_device *dev, int force);
1da177e4	231	extern int fib_sync_up(struct net_device *dev);
b83738ae	232	extern __be32 __fib_res_prefsrc(struct fib_result *res);
1da177e4 LT	233
1da177e4 LT	234	/* Exported by fib_hash.c */
2dfe55b4	235	extern struct fib_table *fib_hash_init(u32 id);
1da177e4 LT	236
1da177e4 LT	237	#ifdef CONFIG_IP_MULTIPLE_TABLES
e1ef4bf2 TG	238	extern int fib4_rules_dump(struct sk_buff skb, struct netlink_callback cb);
	239
	240	extern void __init fib4_rules_init(void);
1da177e4	241
1da177e4 LT	242	#ifdef CONFIG_NET_CLS_ROUTE
	243	extern u32 fib_rules_tclass(struct fib_result *res);
	244	#endif
e1ef4bf2	245
1da177e4 LT	246	#endif
	247
	248	static inline void fib_combine_itag(u32 itag, struct fib_result res)
	249	{
	250	#ifdef CONFIG_NET_CLS_ROUTE
	251	#ifdef CONFIG_IP_MULTIPLE_TABLES
	252	u32 rtag;
	253	#endif
	254	itag = FIB_RES_NH(res).nh_tclassid<<16;
	255	#ifdef CONFIG_IP_MULTIPLE_TABLES
	256	rtag = fib_rules_tclass(res);
	257	if (*itag == 0)
	258	*itag = (rtag<<16);
	259	*itag \|= (rtag>>16);
	260	#endif
	261	#endif
	262	}
	263
	264	extern void free_fib_info(struct fib_info *fi);
	265
	266	static inline void fib_info_put(struct fib_info *fi)
	267	{
	268	if (atomic_dec_and_test(&fi->fib_clntref))
	269	free_fib_info(fi);
	270	}
	271
	272	static inline void fib_res_put(struct fib_result *res)
	273	{
	274	if (res->fi)
	275	fib_info_put(res->fi);
	276	#ifdef CONFIG_IP_MULTIPLE_TABLES
	277	if (res->r)
	278	fib_rule_put(res->r);
	279	#endif
	280	}
	281
20380731 ACM	282	#ifdef CONFIG_PROC_FS
	283	extern int fib_proc_init(void);
	284	extern void fib_proc_exit(void);
	285	#endif
	286
1da177e4	287	#endif /* _NET_FIB_H */