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root/include/net/ip_fib.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. fib_get_table
  2. fib_new_table
  3. fib_lookup
  4. fib_combine_itag
  5. fib_info_put
  6. fib_res_put
  7. fib_proc_init
  8. fib_proc_exit

/*
 * 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_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;
        struct net              *fib_net;
        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
        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;
        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)

#define FIB_TABLE_HASHSZ 2

#else /* CONFIG_IP_ROUTE_MULTIPATH */

#define FIB_RES_NH(res)         ((res).fi->fib_nh[0])
#define FIB_RES_RESET(res)

#define FIB_TABLE_HASHSZ 256

#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)

struct fib_table {
        struct hlist_node tb_hlist;
        u32             tb_id;
        unsigned        tb_stamp;
        int             tb_default;
        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

#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 flowi *flp,
                             struct fib_result *res)
{
        struct fib_table *table;

        table = fib_get_table(net, RT_TABLE_LOCAL);
        if (!table->tb_lookup(table, flp, res))
                return 0;

        table = fib_get_table(net, RT_TABLE_MAIN);
        if (!table->tb_lookup(table, flp, res))
                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_NET_CLS_ROUTE
extern u32 fib_rules_tclass(struct fib_result *res);
#endif

extern int fib_lookup(struct net *n, struct flowi *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(__be32 src, __be32 dst, u8 tos, int oif,
                               struct net_device *dev, __be32 *spec_dst, u32 *itag);
extern void fib_select_default(struct net *net, const struct flowi *flp,
                               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 int fib_sync_up(struct net_device *dev);
extern __be32  __fib_res_prefsrc(struct fib_result *res);
extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);

/* Exported by fib_{hash|trie}.c */
extern void fib_hash_init(void);
extern struct fib_table *fib_hash_table(u32 id);

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 __net_init  fib_proc_init(struct net *net);
extern void __net_exit fib_proc_exit(struct net *net);
#else
static inline int fib_proc_init(struct net *net)
{
        return 0;
}
static inline void fib_proc_exit(struct net *net)
{
}
#endif

#endif  /* _NET_FIB_H */

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