root/include/net/fib_rules.h

INCLUDED FROM

DEFINITIONS

1. fib_rule_get
2. fib_rule_put_rcu
3. fib_rule_put
4. frh_get_table

#ifndef __NET_FIB_RULES_H
#define __NET_FIB_RULES_H

#include <linux/types.h>
#include <linux/netdevice.h>
#include <linux/fib_rules.h>
#include <net/flow.h>
#include <net/rtnetlink.h>

struct fib_rule
{
        struct list_head        list;
        atomic_t                refcnt;
        int                     ifindex;
        char                    ifname[IFNAMSIZ];
        u32                     mark;
        u32                     mark_mask;
        u32                     pref;
        u32                     flags;
        u32                     table;
        u8                      action;
        u32                     target;
        struct fib_rule *       ctarget;
        struct rcu_head         rcu;
        struct net *            fr_net;
};

struct fib_lookup_arg
{
        void                    *lookup_ptr;
        void                    *result;
        struct fib_rule         *rule;
};

struct fib_rules_ops
{
        int                     family;
        struct list_head        list;
        int                     rule_size;
        int                     addr_size;
        int                     unresolved_rules;
        int                     nr_goto_rules;

        int                     (*action)(struct fib_rule *,
                                          struct flowi *, int,
                                          struct fib_lookup_arg *);
        int                     (*match)(struct fib_rule *,
                                         struct flowi *, int);
        int                     (*configure)(struct fib_rule *,
                                             struct sk_buff *,
                                             struct nlmsghdr *,
                                             struct fib_rule_hdr *,
                                             struct nlattr **);
        int                     (*compare)(struct fib_rule *,
                                           struct fib_rule_hdr *,
                                           struct nlattr **);
        int                     (*fill)(struct fib_rule *, struct sk_buff *,
                                        struct nlmsghdr *,
                                        struct fib_rule_hdr *);
        u32                     (*default_pref)(struct fib_rules_ops *ops);
        size_t                  (*nlmsg_payload)(struct fib_rule *);

        /* Called after modifications to the rules set, must flush
         * the route cache if one exists. */
        void                    (*flush_cache)(struct fib_rules_ops *ops);

        int                     nlgroup;
        const struct nla_policy *policy;
        struct list_head        rules_list;
        struct module           *owner;
        struct net              *fro_net;
};

#define FRA_GENERIC_POLICY \
        [FRA_IFNAME]    = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
        [FRA_PRIORITY]  = { .type = NLA_U32 }, \
        [FRA_FWMARK]    = { .type = NLA_U32 }, \
        [FRA_FWMASK]    = { .type = NLA_U32 }, \
        [FRA_TABLE]     = { .type = NLA_U32 }, \
        [FRA_GOTO]      = { .type = NLA_U32 }

static inline void fib_rule_get(struct fib_rule *rule)
{
        atomic_inc(&rule->refcnt);
}

static inline void fib_rule_put_rcu(struct rcu_head *head)
{
        struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
        release_net(rule->fr_net);
        kfree(rule);
}

static inline void fib_rule_put(struct fib_rule *rule)
{
        if (atomic_dec_and_test(&rule->refcnt))
                call_rcu(&rule->rcu, fib_rule_put_rcu);
}

static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
{
        if (nla[FRA_TABLE])
                return nla_get_u32(nla[FRA_TABLE]);
        return frh->table;
}

extern int fib_rules_register(struct fib_rules_ops *);
extern void fib_rules_unregister(struct fib_rules_ops *);
extern void                     fib_rules_cleanup_ops(struct fib_rules_ops *);

extern int                      fib_rules_lookup(struct fib_rules_ops *,
                                                 struct flowi *, int flags,
                                                 struct fib_lookup_arg *);
extern int                      fib_default_rule_add(struct fib_rules_ops *,
                                                     u32 pref, u32 table,
                                                     u32 flags);
#endif