root/include/net/dn_fib.h

INCLUDED FROM

DEFINITIONS

1. dn_fib_info_put
2. dn_fib_res_put
3. dnet_make_mask

#ifndef _NET_DN_FIB_H
#define _NET_DN_FIB_H

/* WARNING: The ordering of these elements must match ordering
 *          of RTA_* rtnetlink attribute numbers.
 */
struct dn_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;
};

struct dn_fib_res {
        struct fib_rule *r;
        struct dn_fib_info *fi;
        unsigned char prefixlen;
        unsigned char nh_sel;
        unsigned char type;
        unsigned char scope;
};

struct dn_fib_nh {
        struct net_device       *nh_dev;
        unsigned                nh_flags;
        unsigned char           nh_scope;
        int                     nh_weight;
        int                     nh_power;
        int                     nh_oif;
        __le16                  nh_gw;
};

struct dn_fib_info {
        struct dn_fib_info      *fib_next;
        struct dn_fib_info      *fib_prev;
        int                     fib_treeref;
        atomic_t                fib_clntref;
        int                     fib_dead;
        unsigned                fib_flags;
        int                     fib_protocol;
        __le16                  fib_prefsrc;
        __u32                   fib_priority;
        __u32                   fib_metrics[RTAX_MAX];
#define dn_fib_mtu  fib_metrics[RTAX_MTU-1]
#define dn_fib_window fib_metrics[RTAX_WINDOW-1]
#define dn_fib_rtt fib_metrics[RTAX_RTT-1]
#define dn_fib_advmss fib_metrics[RTAX_ADVMSS-1]
        int                     fib_nhs;
        int                     fib_power;
        struct dn_fib_nh        fib_nh[0];
#define dn_fib_dev              fib_nh[0].nh_dev
};


#define DN_FIB_RES_RESET(res)   ((res).nh_sel = 0)
#define DN_FIB_RES_NH(res)      ((res).fi->fib_nh[(res).nh_sel])

#define DN_FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __dn_fib_res_prefsrc(&res))
#define DN_FIB_RES_GW(res)      (DN_FIB_RES_NH(res).nh_gw)
#define DN_FIB_RES_DEV(res)     (DN_FIB_RES_NH(res).nh_dev)
#define DN_FIB_RES_OIF(res)     (DN_FIB_RES_NH(res).nh_oif)

typedef struct {
        __le16  datum;
} dn_fib_key_t;

typedef struct {
        __le16  datum;
} dn_fib_hash_t;

typedef struct {
        __u16   datum;
} dn_fib_idx_t;

struct dn_fib_node {
        struct dn_fib_node *fn_next;
        struct dn_fib_info *fn_info;
#define DN_FIB_INFO(f) ((f)->fn_info)
        dn_fib_key_t    fn_key;
        u8              fn_type;
        u8              fn_scope;
        u8              fn_state;
};


struct dn_fib_table {
        struct hlist_node hlist;
        u32 n;

        int (*insert)(struct dn_fib_table *t, struct rtmsg *r, 
                        struct dn_kern_rta *rta, struct nlmsghdr *n, 
                        struct netlink_skb_parms *req);
        int (*delete)(struct dn_fib_table *t, struct rtmsg *r,
                        struct dn_kern_rta *rta, struct nlmsghdr *n,
                        struct netlink_skb_parms *req);
        int (*lookup)(struct dn_fib_table *t, const struct flowi *fl,
                        struct dn_fib_res *res);
        int (*flush)(struct dn_fib_table *t);
        int (*dump)(struct dn_fib_table *t, struct sk_buff *skb, struct netlink_callback *cb);

        unsigned char data[0];
};

#ifdef CONFIG_DECNET_ROUTER
/*
 * dn_fib.c
 */
extern void dn_fib_init(void);
extern void dn_fib_cleanup(void);

extern int dn_fib_ioctl(struct socket *sock, unsigned int cmd, 
                        unsigned long arg);
extern struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, 
                                struct dn_kern_rta *rta, 
                                const struct nlmsghdr *nlh, int *errp);
extern int dn_fib_semantic_match(int type, struct dn_fib_info *fi, 
                        const struct flowi *fl,
                        struct dn_fib_res *res);
extern void dn_fib_release_info(struct dn_fib_info *fi);
extern __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type);
extern void dn_fib_flush(void);
extern void dn_fib_select_multipath(const struct flowi *fl,
                                        struct dn_fib_res *res);

/*
 * dn_tables.c
 */
extern struct dn_fib_table *dn_fib_get_table(u32 n, int creat);
extern struct dn_fib_table *dn_fib_empty_table(void);
extern void dn_fib_table_init(void);
extern void dn_fib_table_cleanup(void);

/*
 * dn_rules.c
 */
extern void dn_fib_rules_init(void);
extern void dn_fib_rules_cleanup(void);
extern unsigned dnet_addr_type(__le16 addr);
extern int dn_fib_lookup(struct flowi *fl, struct dn_fib_res *res);

extern int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb);

extern void dn_fib_free_info(struct dn_fib_info *fi);

static inline void dn_fib_info_put(struct dn_fib_info *fi)
{
        if (atomic_dec_and_test(&fi->fib_clntref))
                dn_fib_free_info(fi);
}

static inline void dn_fib_res_put(struct dn_fib_res *res)
{
        if (res->fi)
                dn_fib_info_put(res->fi);
        if (res->r)
                fib_rule_put(res->r);
}

#else /* Endnode */

#define dn_fib_init()  do { } while(0)
#define dn_fib_cleanup() do { } while(0)

#define dn_fib_lookup(fl, res) (-ESRCH)
#define dn_fib_info_put(fi) do { } while(0)
#define dn_fib_select_multipath(fl, res) do { } while(0)
#define dn_fib_rules_policy(saddr,res,flags) (0)
#define dn_fib_res_put(res) do { } while(0)

#endif /* CONFIG_DECNET_ROUTER */

static inline __le16 dnet_make_mask(int n)
{
        if (n)
                return dn_htons(~((1<<(16-n))-1));
        return 0;
}

#endif /* _NET_DN_FIB_H */