root/include/net/ip6_fib.h

INCLUDED FROM

DEFINITIONS

1. ip6_dst_idev
2. fib6_rules_init
3. fib6_rules_cleanup

/*
 *      Linux INET6 implementation 
 *
 *      Authors:
 *      Pedro Roque             <roque@di.fc.ul.pt>     
 *
 *      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 _IP6_FIB_H
#define _IP6_FIB_H

#ifdef __KERNEL__

#include <linux/ipv6_route.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/netlink.h>

struct rt6_info;

struct fib6_config
{
        u32             fc_table;
        u32             fc_metric;
        int             fc_dst_len;
        int             fc_src_len;
        int             fc_ifindex;
        u32             fc_flags;
        u32             fc_protocol;

        struct in6_addr fc_dst;
        struct in6_addr fc_src;
        struct in6_addr fc_gateway;

        unsigned long   fc_expires;
        struct nlattr   *fc_mx;
        int             fc_mx_len;

        struct nl_info  fc_nlinfo;
};

struct fib6_node
{
        struct fib6_node        *parent;
        struct fib6_node        *left;
        struct fib6_node        *right;
#ifdef CONFIG_IPV6_SUBTREES
        struct fib6_node        *subtree;
#endif
        struct rt6_info         *leaf;

        __u16                   fn_bit;         /* bit key */
        __u16                   fn_flags;
        __u32                   fn_sernum;
        struct rt6_info         *rr_ptr;
};

#ifndef CONFIG_IPV6_SUBTREES
#define FIB6_SUBTREE(fn)        NULL
#else
#define FIB6_SUBTREE(fn)        ((fn)->subtree)
#endif

/*
 *      routing information
 *
 */

struct rt6key
{
        struct in6_addr addr;
        int             plen;
};

struct fib6_table;

struct rt6_info
{
        union {
                struct dst_entry        dst;
        } u;

        struct inet6_dev                *rt6i_idev;

#define rt6i_dev                        u.dst.dev
#define rt6i_nexthop                    u.dst.neighbour
#define rt6i_expires                    u.dst.expires

        struct fib6_node                *rt6i_node;

        struct in6_addr                 rt6i_gateway;
        
        u32                             rt6i_flags;
        u32                             rt6i_metric;
        atomic_t                        rt6i_ref;

        /* more non-fragment space at head required */
        unsigned short                  rt6i_nfheader_len;

        u8                              rt6i_protocol;

        struct fib6_table               *rt6i_table;

        struct rt6key                   rt6i_dst;

#ifdef CONFIG_XFRM
        u32                             rt6i_flow_cache_genid;
#endif

        struct rt6key                   rt6i_src;
};

static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
{
        return ((struct rt6_info *)dst)->rt6i_idev;
}

struct fib6_walker_t
{
        struct fib6_walker_t *prev, *next;
        struct fib6_node *root, *node;
        struct rt6_info *leaf;
        unsigned char state;
        unsigned char prune;
        int (*func)(struct fib6_walker_t *);
        void *args;
};

struct rt6_statistics {
        __u32           fib_nodes;
        __u32           fib_route_nodes;
        __u32           fib_rt_alloc;           /* permanent routes     */
        __u32           fib_rt_entries;         /* rt entries in table  */
        __u32           fib_rt_cache;           /* cache routes         */
        __u32           fib_discarded_routes;
};

#define RTN_TL_ROOT     0x0001
#define RTN_ROOT        0x0002          /* tree root node               */
#define RTN_RTINFO      0x0004          /* node with valid routing info */

/*
 *      priority levels (or metrics)
 *
 */


struct fib6_table {
        struct hlist_node       tb6_hlist;
        u32                     tb6_id;
        rwlock_t                tb6_lock;
        struct fib6_node        tb6_root;
};

#define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
#define RT6_TABLE_MAIN          RT_TABLE_MAIN
#define RT6_TABLE_DFLT          RT6_TABLE_MAIN
#define RT6_TABLE_INFO          RT6_TABLE_MAIN
#define RT6_TABLE_PREFIX        RT6_TABLE_MAIN

#ifdef CONFIG_IPV6_MULTIPLE_TABLES
#define FIB6_TABLE_MIN          1
#define FIB6_TABLE_MAX          RT_TABLE_MAX
#define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
#else
#define FIB6_TABLE_MIN          RT_TABLE_MAIN
#define FIB6_TABLE_MAX          FIB6_TABLE_MIN
#define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
#endif

typedef struct rt6_info *(*pol_lookup_t)(struct net *,
                                         struct fib6_table *,
                                         struct flowi *, int);

/*
 *      exported functions
 */

extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
extern struct dst_entry         *fib6_rule_lookup(struct net *net,
                                                  struct flowi *fl, int flags,
                                                  pol_lookup_t lookup);

extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
                                             struct in6_addr *daddr,
                                             struct in6_addr *saddr);

struct fib6_node                *fib6_locate(struct fib6_node *root,
                                             struct in6_addr *daddr, int dst_len,
                                             struct in6_addr *saddr, int src_len);

extern void                     fib6_clean_all(struct net *net,
                                               int (*func)(struct rt6_info *, void *arg),
                                               int prune, void *arg);

extern int                      fib6_add(struct fib6_node *root,
                                         struct rt6_info *rt,
                                         struct nl_info *info);

extern int                      fib6_del(struct rt6_info *rt,
                                         struct nl_info *info);

extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
                                                struct nl_info *info);

extern void                     fib6_run_gc(unsigned long expires,
                                            struct net *net);

extern void                     fib6_gc_cleanup(void);

extern int                      fib6_init(void);

#ifdef CONFIG_IPV6_MULTIPLE_TABLES
extern int                      fib6_rules_init(void);
extern void                     fib6_rules_cleanup(void);
#else
static inline int               fib6_rules_init(void)
{
        return 0;
}
static inline void              fib6_rules_cleanup(void)
{
        return ;
}
#endif
#endif
#endif