LXR linux/include/net/act

   1#ifndef __NET_ACT_API_H
   2#define __NET_ACT_API_H
   3
   4/*
   5 * Public police action API for classifiers/qdiscs
   6 */
   7
   8#include <net/sch_generic.h>
   9#include <net/pkt_sched.h>
  10
  11struct tcf_common {
  12        struct hlist_node               tcfc_head;
  13        u32                             tcfc_index;
  14        int                             tcfc_refcnt;
  15        int                             tcfc_bindcnt;
  16        u32                             tcfc_capab;
  17        int                             tcfc_action;
  18        struct tcf_t                    tcfc_tm;
  19        struct gnet_stats_basic_packed  tcfc_bstats;
  20        struct gnet_stats_queue         tcfc_qstats;
  21        struct gnet_stats_rate_est64    tcfc_rate_est;
  22        spinlock_t                      tcfc_lock;
  23        struct rcu_head                 tcfc_rcu;
  24        struct gnet_stats_basic_cpu __percpu *cpu_bstats;
  25        struct gnet_stats_queue __percpu *cpu_qstats;
  26};
  27#define tcf_head        common.tcfc_head
  28#define tcf_index       common.tcfc_index
  29#define tcf_refcnt      common.tcfc_refcnt
  30#define tcf_bindcnt     common.tcfc_bindcnt
  31#define tcf_capab       common.tcfc_capab
  32#define tcf_action      common.tcfc_action
  33#define tcf_tm          common.tcfc_tm
  34#define tcf_bstats      common.tcfc_bstats
  35#define tcf_qstats      common.tcfc_qstats
  36#define tcf_rate_est    common.tcfc_rate_est
  37#define tcf_lock        common.tcfc_lock
  38#define tcf_rcu         common.tcfc_rcu
  39
  40struct tcf_hashinfo {
  41        struct hlist_head       *htab;
  42        unsigned int            hmask;
  43        spinlock_t              lock;
  44        u32                     index;
  45};
  46
  47static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
  48{
  49        return index & hmask;
  50}
  51
  52static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
  53{
  54        int i;
  55
  56        spin_lock_init(&hf->lock);
  57        hf->index = 0;
  58        hf->hmask = mask;
  59        hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
  60                           GFP_KERNEL);
  61        if (!hf->htab)
  62                return -ENOMEM;
  63        for (i = 0; i < mask + 1; i++)
  64                INIT_HLIST_HEAD(&hf->htab[i]);
  65        return 0;
  66}
  67
  68static inline void tcf_hashinfo_destroy(struct tcf_hashinfo *hf)
  69{
  70        kfree(hf->htab);
  71}
  72
  73/* Update lastuse only if needed, to avoid dirtying a cache line.
  74 * We use a temp variable to avoid fetching jiffies twice.
  75 */
  76static inline void tcf_lastuse_update(struct tcf_t *tm)
  77{
  78        unsigned long now = jiffies;
  79
  80        if (tm->lastuse != now)
  81                tm->lastuse = now;
  82}
  83
  84#ifdef CONFIG_NET_CLS_ACT
  85
  86#define ACT_P_CREATED 1
  87#define ACT_P_DELETED 1
  88
  89struct tc_action {
  90        void                    *priv;
  91        const struct tc_action_ops      *ops;
  92        __u32                   type; /* for backward compat(TCA_OLD_COMPAT) */
  93        __u32                   order;
  94        struct list_head        list;
  95};
  96
  97struct tc_action_ops {
  98        struct list_head head;
  99        struct tcf_hashinfo *hinfo;
 100        char    kind[IFNAMSIZ];
 101        __u32   type; /* TBD to match kind */
 102        struct module           *owner;
 103        int     (*act)(struct sk_buff *, const struct tc_action *, struct tcf_result *);
 104        int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
 105        void    (*cleanup)(struct tc_action *, int bind);
 106        int     (*lookup)(struct tc_action *, u32);
 107        int     (*init)(struct net *net, struct nlattr *nla,
 108                        struct nlattr *est, struct tc_action *act, int ovr,
 109                        int bind);
 110        int     (*walk)(struct sk_buff *, struct netlink_callback *, int, struct tc_action *);
 111};
 112
 113int tcf_hash_search(struct tc_action *a, u32 index);
 114u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo);
 115int tcf_hash_check(u32 index, struct tc_action *a, int bind);
 116int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a,
 117                    int size, int bind, bool cpustats);
 118void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
 119void tcf_hash_insert(struct tc_action *a);
 120
 121int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
 122
 123static inline int tcf_hash_release(struct tc_action *a, bool bind)
 124{
 125        return __tcf_hash_release(a, bind, false);
 126}
 127
 128int tcf_register_action(struct tc_action_ops *a, unsigned int mask);
 129int tcf_unregister_action(struct tc_action_ops *a);
 130int tcf_action_destroy(struct list_head *actions, int bind);
 131int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
 132                    struct tcf_result *res);
 133int tcf_action_init(struct net *net, struct nlattr *nla,
 134                                  struct nlattr *est, char *n, int ovr,
 135                                  int bind, struct list_head *);
 136struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
 137                                    struct nlattr *est, char *n, int ovr,
 138                                    int bind);
 139int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
 140int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
 141int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
 142int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 143#endif /* CONFIG_NET_CLS_ACT */
 144#endif
 145