root/include/net/act_api.h

INCLUDED FROM

DEFINITIONS

1. tcf_hash
2. tcf_hashinfo_init
3. tcf_hashinfo_destroy

#ifndef __NET_ACT_API_H
#define __NET_ACT_API_H

/*
 * Public police action API for classifiers/qdiscs
 */

#include <net/sch_generic.h>
#include <net/pkt_sched.h>

struct tcf_common {
        struct hlist_node               tcfc_head;
        u32                             tcfc_index;
        int                             tcfc_refcnt;
        int                             tcfc_bindcnt;
        u32                             tcfc_capab;
        int                             tcfc_action;
        struct tcf_t                    tcfc_tm;
        struct gnet_stats_basic_packed  tcfc_bstats;
        struct gnet_stats_queue         tcfc_qstats;
        struct gnet_stats_rate_est64    tcfc_rate_est;
        spinlock_t                      tcfc_lock;
        struct rcu_head                 tcfc_rcu;
};
#define tcf_head        common.tcfc_head
#define tcf_index       common.tcfc_index
#define tcf_refcnt      common.tcfc_refcnt
#define tcf_bindcnt     common.tcfc_bindcnt
#define tcf_capab       common.tcfc_capab
#define tcf_action      common.tcfc_action
#define tcf_tm          common.tcfc_tm
#define tcf_bstats      common.tcfc_bstats
#define tcf_qstats      common.tcfc_qstats
#define tcf_rate_est    common.tcfc_rate_est
#define tcf_lock        common.tcfc_lock
#define tcf_rcu         common.tcfc_rcu

struct tcf_hashinfo {
        struct hlist_head       *htab;
        unsigned int            hmask;
        spinlock_t              lock;
        u32                     index;
};

static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
{
        return index & hmask;
}

static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
{
        int i;

        spin_lock_init(&hf->lock);
        hf->index = 0;
        hf->hmask = mask;
        hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
                           GFP_KERNEL);
        if (!hf->htab)
                return -ENOMEM;
        for (i = 0; i < mask + 1; i++)
                INIT_HLIST_HEAD(&hf->htab[i]);
        return 0;
}

static inline void tcf_hashinfo_destroy(struct tcf_hashinfo *hf)
{
        kfree(hf->htab);
}

#ifdef CONFIG_NET_CLS_ACT

#define ACT_P_CREATED 1
#define ACT_P_DELETED 1

struct tc_action {
        void                    *priv;
        const struct tc_action_ops      *ops;
        __u32                   type; /* for backward compat(TCA_OLD_COMPAT) */
        __u32                   order;
        struct list_head        list;
};

struct tc_action_ops {
        struct list_head head;
        struct tcf_hashinfo *hinfo;
        char    kind[IFNAMSIZ];
        __u32   type; /* TBD to match kind */
        struct module           *owner;
        int     (*act)(struct sk_buff *, const struct tc_action *, struct tcf_result *);
        int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
        void    (*cleanup)(struct tc_action *, int bind);
        int     (*lookup)(struct tc_action *, u32);
        int     (*init)(struct net *net, struct nlattr *nla,
                        struct nlattr *est, struct tc_action *act, int ovr,
                        int bind);
        int     (*walk)(struct sk_buff *, struct netlink_callback *, int, struct tc_action *);
};

int tcf_hash_search(struct tc_action *a, u32 index);
void tcf_hash_destroy(struct tc_action *a);
int tcf_hash_release(struct tc_action *a, int bind);
u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo);
int tcf_hash_check(u32 index, struct tc_action *a, int bind);
int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a,
                    int size, int bind);
void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
void tcf_hash_insert(struct tc_action *a);

int tcf_register_action(struct tc_action_ops *a, unsigned int mask);
int tcf_unregister_action(struct tc_action_ops *a);
int tcf_action_destroy(struct list_head *actions, int bind);
int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
                    struct tcf_result *res);
int tcf_action_init(struct net *net, struct nlattr *nla,
                                  struct nlattr *est, char *n, int ovr,
                                  int bind, struct list_head *);
struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
                                    struct nlattr *est, char *n, int ovr,
                                    int bind);
int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
#endif /* CONFIG_NET_CLS_ACT */
#endif