act_api.h

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#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 tcf_common       *tcfc_next;
    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_est  tcfc_rate_est;
    spinlock_t          tcfc_lock;
    struct rcu_head         tcfc_rcu;
};
#define tcf_next    common.tcfc_next
#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_police {
    struct tcf_common   common;
    int         tcfp_result;
    u32         tcfp_ewma_rate;
    u32         tcfp_burst;
    u32         tcfp_mtu;
    u32         tcfp_toks;
    u32         tcfp_ptoks;
    psched_time_t       tcfp_t_c;
    struct qdisc_rate_table *tcfp_R_tab;
    struct qdisc_rate_table *tcfp_P_tab;
};
#define to_police(pc)   \
    container_of(pc, struct tcf_police, common)

struct tcf_hashinfo {
    struct tcf_common   **htab;
    unsigned int        hmask;
    rwlock_t        *lock;
};

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

#ifdef CONFIG_NET_CLS_ACT

#define ACT_P_CREATED 1
#define ACT_P_DELETED 1

struct tcf_act_hdr {
    struct tcf_common   common;
};

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

#define TCA_CAP_NONE 0
struct tc_action_ops {
    struct tc_action_ops *next;
    struct tcf_hashinfo *hinfo;
    char    kind[IFNAMSIZ];
    __u32   type; /* TBD to match kind */
    __u32   capab;  /* capabilities includes 4 bit version */
    struct module       *owner;
    int     (*act)(struct sk_buff *, const struct tc_action *, struct tcf_result *);
    int     (*get_stats)(struct sk_buff *, struct tc_action *);
    int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
    int     (*cleanup)(struct tc_action *, int bind);
    int     (*lookup)(struct tc_action *, u32);
    int     (*init)(struct nlattr *, struct nlattr *, struct tc_action *, int , int);
    int     (*walk)(struct sk_buff *, struct netlink_callback *, int, struct tc_action *);
};

extern struct tcf_common *tcf_hash_lookup(u32 index,
                      struct tcf_hashinfo *hinfo);
extern void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo);
extern int tcf_hash_release(struct tcf_common *p, int bind,
                struct tcf_hashinfo *hinfo);
extern int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
                  int type, struct tc_action *a);
extern u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo);
extern int tcf_hash_search(struct tc_action *a, u32 index);
extern struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a,
                     int bind, struct tcf_hashinfo *hinfo);
extern struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est,
                      struct tc_action *a, int size,
                      int bind, u32 *idx_gen,
                      struct tcf_hashinfo *hinfo);
extern void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo);

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