include/net/act_api.h

   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
  11 struct 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
  40 struct tcf_hashinfo {
  41         struct hlist_head       *htab;
  42         unsigned int            hmask;
  43         spinlock_t              lock;
  44         u32                     index;
  45 };
  46
  47 static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
  48 {
  49         return index & hmask;
  50 }
  51
  52 static 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
  68 static 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  */
  76 static 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
  89 struct 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
  97 struct 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
 113 int tcf_hash_search(struct tc_action *a, u32 index);
 114 u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo);
 115 int tcf_hash_check(u32 index, struct tc_action *a, int bind);
 116 int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a,
 117                     int size, int bind, bool cpustats);
 118 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
 119 void tcf_hash_insert(struct tc_action *a);
 120
 121 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
 122
 123 static inline int tcf_hash_release(struct tc_action *a, bool bind)
 124 {
 125         return __tcf_hash_release(a, bind, false);
 126 }
 127
 128 int tcf_register_action(struct tc_action_ops *a, unsigned int mask);
 129 int tcf_unregister_action(struct tc_action_ops *a);
 130 int tcf_action_destroy(struct list_head *actions, int bind);
 131 int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
 132                     struct tcf_result *res);
 133 int tcf_action_init(struct net *net, struct nlattr *nla,
 134                                   struct nlattr *est, char *n, int ovr,
 135                                   int bind, struct list_head *);
 136 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
 137                                     struct nlattr *est, char *n, int ovr,
 138                                     int bind);
 139 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
 140 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
 141 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
 142 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 143 #endif /* CONFIG_NET_CLS_ACT */
 144 #endif