[GitHub/mt8127/android_kernel_alcatel_ttab.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_family;
	u8			fc_dst_len;
	u8			fc_src_len;
	u8			fc_tos;
	u8			fc_protocol;
	u8			fc_scope;
	u8			fc_type;
	/* 1 byte unused */
	u32			fc_table;
	__be32			fc_dst;
	__be32			fc_src;
	__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
	__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 {
	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(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 __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 TG	23	struct fib_config {
	24	u8 fc_family;
	25	u8 fc_dst_len;
	26	u8 fc_src_len;
	27	u8 fc_tos;
	28	u8 fc_protocol;
	29	u8 fc_scope;
	30	u8 fc_type;
	31	/* 1 byte unused */
	32	u32 fc_table;
6d85c10a AV	33	__be32 fc_dst;
	34	__be32 fc_src;
	35	__be32 fc_gw;
4e902c57 TG	36	int fc_oif;
	37	u32 fc_flags;
	38	u32 fc_priority;
6d85c10a	39	__be32 fc_prefsrc;
4e902c57 TG	40	struct nlattr *fc_mx;
	41	struct rtnexthop *fc_mp;
	42	int fc_mx_len;
	43	int fc_mp_len;
	44	u32 fc_flow;
	45	u32 fc_mp_alg;
	46	u32 fc_nlflags;
	47	struct nl_info fc_nlinfo;
	48	};
1da177e4 LT	49
	50	struct fib_info;
	51
	52	struct fib_nh {
	53	struct net_device *nh_dev;
	54	struct hlist_node nh_hash;
	55	struct fib_info *nh_parent;
	56	unsigned nh_flags;
	57	unsigned char nh_scope;
	58	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	59	int nh_weight;
	60	int nh_power;
	61	#endif
	62	#ifdef CONFIG_NET_CLS_ROUTE
	63	__u32 nh_tclassid;
	64	#endif
	65	int nh_oif;
ed49e3ca	66	__be32 nh_gw;
1da177e4 LT	67	};
	68
	69	/*
	70	* This structure contains data shared by many of routes.
	71	*/
	72
	73	struct fib_info {
	74	struct hlist_node fib_hash;
	75	struct hlist_node fib_lhash;
	76	int fib_treeref;
	77	atomic_t fib_clntref;
	78	int fib_dead;
	79	unsigned fib_flags;
	80	int fib_protocol;
b83738ae	81	__be32 fib_prefsrc;
1da177e4 LT	82	u32 fib_priority;
	83	u32 fib_metrics[RTAX_MAX];
	84	#define fib_mtu fib_metrics[RTAX_MTU-1]
	85	#define fib_window fib_metrics[RTAX_WINDOW-1]
	86	#define fib_rtt fib_metrics[RTAX_RTT-1]
	87	#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
	88	int fib_nhs;
	89	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	90	int fib_power;
	91	#endif
	92	#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
	93	u32 fib_mp_alg;
	94	#endif
	95	struct fib_nh fib_nh[0];
	96	#define fib_dev fib_nh[0].nh_dev
	97	};
	98
	99
	100	#ifdef CONFIG_IP_MULTIPLE_TABLES
	101	struct fib_rule;
	102	#endif
	103
	104	struct fib_result {
	105	unsigned char prefixlen;
	106	unsigned char nh_sel;
	107	unsigned char type;
	108	unsigned char scope;
	109	#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
	110	__u32 network;
	111	__u32 netmask;
	112	#endif
	113	struct fib_info *fi;
	114	#ifdef CONFIG_IP_MULTIPLE_TABLES
	115	struct fib_rule *r;
	116	#endif
	117	};
	118
246955fe RO	119	struct fib_result_nl {
	120	u32 fl_addr; /* To be looked up*/
	121	u32 fl_fwmark;
	122	unsigned char fl_tos;
	123	unsigned char fl_scope;
	124	unsigned char tb_id_in;
	125
	126	unsigned char tb_id; /* Results */
	127	unsigned char prefixlen;
	128	unsigned char nh_sel;
	129	unsigned char type;
	130	unsigned char scope;
	131	int err;
	132	};
1da177e4 LT	133
	134	#ifdef CONFIG_IP_ROUTE_MULTIPATH
	135
	136	#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
	137	#define FIB_RES_RESET(res) ((res).nh_sel = 0)
	138
	139	#else /* CONFIG_IP_ROUTE_MULTIPATH */
	140
	141	#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
	142	#define FIB_RES_RESET(res)
	143
	144	#endif /* CONFIG_IP_ROUTE_MULTIPATH */
	145
	146	#define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
	147	#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
	148	#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
	149	#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
	150
	151	#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
	152	#define FIB_RES_NETWORK(res) ((res).network)
	153	#define FIB_RES_NETMASK(res) ((res).netmask)
	154	#else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
	155	#define FIB_RES_NETWORK(res) (0)
	156	#define FIB_RES_NETMASK(res) (0)
	157	#endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */
	158
	159	struct fib_table {
1af5a8c4	160	struct hlist_node tb_hlist;
2dfe55b4	161	u32 tb_id;
1da177e4 LT	162	unsigned tb_stamp;
1da177e4 LT	163	int (tb_lookup)(struct fib_table tb, const struct flowi flp, struct fib_result res);
4e902c57 TG	164	int (tb_insert)(struct fib_table , struct fib_config *);
4e902c57 TG	165	int (tb_delete)(struct fib_table , struct fib_config *);
1da177e4 LT	166	int (tb_dump)(struct fib_table table, struct sk_buff *skb,
	167	struct netlink_callback *cb);
	168	int (tb_flush)(struct fib_table table);
	169	void (tb_select_default)(struct fib_table table,
	170	const struct flowi flp, struct fib_result res);
	171
	172	unsigned char tb_data[0];
	173	};
	174
	175	#ifndef CONFIG_IP_MULTIPLE_TABLES
	176
	177	extern struct fib_table *ip_fib_local_table;
	178	extern struct fib_table *ip_fib_main_table;
	179
2dfe55b4	180	static inline struct fib_table *fib_get_table(u32 id)
1da177e4 LT	181	{
	182	if (id != RT_TABLE_LOCAL)
	183	return ip_fib_main_table;
	184	return ip_fib_local_table;
	185	}
	186
2dfe55b4	187	static inline struct fib_table *fib_new_table(u32 id)
1da177e4 LT	188	{
	189	return fib_get_table(id);
	190	}
	191
	192	static inline int fib_lookup(const struct flowi flp, struct fib_result res)
	193	{
	194	if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
	195	ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
	196	return -ENETUNREACH;
	197	return 0;
	198	}
	199
	200	static inline void fib_select_default(const struct flowi flp, struct fib_result res)
	201	{
	202	if (FIB_RES_GW(res) && FIB_RES_NH(res).nh_scope == RT_SCOPE_LINK)
	203	ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
	204	}
	205
	206	#else /* CONFIG_IP_MULTIPLE_TABLES */
1af5a8c4 PM	207	#define ip_fib_local_table fib_get_table(RT_TABLE_LOCAL)
1af5a8c4 PM	208	#define ip_fib_main_table fib_get_table(RT_TABLE_MAIN)
1da177e4	209
e1ef4bf2	210	extern int fib_lookup(struct flowi flp, struct fib_result res);
1da177e4	211
1af5a8c4 PM	212	extern struct fib_table *fib_new_table(u32 id);
1af5a8c4 PM	213	extern struct fib_table *fib_get_table(u32 id);
1da177e4 LT	214	extern void fib_select_default(const struct flowi flp, struct fib_result res);
	215
	216	#endif /* CONFIG_IP_MULTIPLE_TABLES */
	217
	218	/* Exported by fib_frontend.c */
d889ce3b	219	extern struct nla_policy rtm_ipv4_policy[];
1da177e4 LT	220	extern void ip_fib_init(void);
	221	extern int inet_rtm_delroute(struct sk_buff skb, struct nlmsghdr nlh, void *arg);
	222	extern int inet_rtm_newroute(struct sk_buff skb, struct nlmsghdr nlh, void *arg);
	223	extern int inet_rtm_getroute(struct sk_buff skb, struct nlmsghdr nlh, void *arg);
	224	extern int inet_dump_fib(struct sk_buff skb, struct netlink_callback cb);
d9c9df8c AV	225	extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
d9c9df8c AV	226	struct net_device dev, __be32 spec_dst, u32 *itag);
1da177e4 LT	227	extern void fib_select_multipath(const struct flowi flp, struct fib_result res);
1da177e4 LT	228
14c85021 ACM	229	struct rtentry;
14c85021 ACM	230
1da177e4 LT	231	/* Exported by fib_semantics.c */
	232	extern int ip_fib_check_default(u32 gw, struct net_device *dev);
	233	extern int fib_sync_down(u32 local, struct net_device *dev, int force);
	234	extern int fib_sync_up(struct net_device *dev);
b83738ae	235	extern __be32 __fib_res_prefsrc(struct fib_result *res);
1da177e4 LT	236
1da177e4 LT	237	/* Exported by fib_hash.c */
2dfe55b4	238	extern struct fib_table *fib_hash_init(u32 id);
1da177e4 LT	239
1da177e4 LT	240	#ifdef CONFIG_IP_MULTIPLE_TABLES
e1ef4bf2 TG	241	extern int fib4_rules_dump(struct sk_buff skb, struct netlink_callback cb);
	242
	243	extern void __init fib4_rules_init(void);
1da177e4	244
1da177e4 LT	245	#ifdef CONFIG_NET_CLS_ROUTE
	246	extern u32 fib_rules_tclass(struct fib_result *res);
	247	#endif
e1ef4bf2	248
1da177e4 LT	249	#endif
	250
	251	static inline void fib_combine_itag(u32 itag, struct fib_result res)
	252	{
	253	#ifdef CONFIG_NET_CLS_ROUTE
	254	#ifdef CONFIG_IP_MULTIPLE_TABLES
	255	u32 rtag;
	256	#endif
	257	itag = FIB_RES_NH(res).nh_tclassid<<16;
	258	#ifdef CONFIG_IP_MULTIPLE_TABLES
	259	rtag = fib_rules_tclass(res);
	260	if (*itag == 0)
	261	*itag = (rtag<<16);
	262	*itag \|= (rtag>>16);
	263	#endif
	264	#endif
	265	}
	266
	267	extern void free_fib_info(struct fib_info *fi);
	268
	269	static inline void fib_info_put(struct fib_info *fi)
	270	{
	271	if (atomic_dec_and_test(&fi->fib_clntref))
	272	free_fib_info(fi);
	273	}
	274
	275	static inline void fib_res_put(struct fib_result *res)
	276	{
	277	if (res->fi)
	278	fib_info_put(res->fi);
	279	#ifdef CONFIG_IP_MULTIPLE_TABLES
	280	if (res->r)
	281	fib_rule_put(res->r);
	282	#endif
	283	}
	284
20380731 ACM	285	#ifdef CONFIG_PROC_FS
	286	extern int fib_proc_init(void);
	287	extern void fib_proc_exit(void);
	288	#endif
	289
1da177e4	290	#endif /* _NET_FIB_H */