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 #include <net/net_namespace.h>
  11 #include <net/netns/generic.h>
  12
  13 struct tcf_common {
  14         struct hlist_node               tcfc_head;
  15         u32                             tcfc_index;
  16         int                             tcfc_refcnt;
  17         int                             tcfc_bindcnt;
  18         u32                             tcfc_capab;
  19         int                             tcfc_action;
  20         struct tcf_t                    tcfc_tm;
  21         struct gnet_stats_basic_packed  tcfc_bstats;
  22         struct gnet_stats_queue         tcfc_qstats;
  23         struct gnet_stats_rate_est64    tcfc_rate_est;
  24         spinlock_t                      tcfc_lock;
  25         struct rcu_head                 tcfc_rcu;
  26         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
  27         struct gnet_stats_queue __percpu *cpu_qstats;
  28 };
  29 #define tcf_head        common.tcfc_head
  30 #define tcf_index       common.tcfc_index
  31 #define tcf_refcnt      common.tcfc_refcnt
  32 #define tcf_bindcnt     common.tcfc_bindcnt
  33 #define tcf_capab       common.tcfc_capab
  34 #define tcf_action      common.tcfc_action
  35 #define tcf_tm          common.tcfc_tm
  36 #define tcf_bstats      common.tcfc_bstats
  37 #define tcf_qstats      common.tcfc_qstats
  38 #define tcf_rate_est    common.tcfc_rate_est
  39 #define tcf_lock        common.tcfc_lock
  40 #define tcf_rcu         common.tcfc_rcu
  41
  42 struct tcf_hashinfo {
  43         struct hlist_head       *htab;
  44         unsigned int            hmask;
  45         spinlock_t              lock;
  46         u32                     index;
  47 };
  48
  49 static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
  50 {
  51         return index & hmask;
  52 }
  53
  54 static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
  55 {
  56         int i;
  57
  58         spin_lock_init(&hf->lock);
  59         hf->index = 0;
  60         hf->hmask = mask;
  61         hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
  62                            GFP_KERNEL);
  63         if (!hf->htab)
  64                 return -ENOMEM;
  65         for (i = 0; i < mask + 1; i++)
  66                 INIT_HLIST_HEAD(&hf->htab[i]);
  67         return 0;
  68 }
  69
  70 /* Update lastuse only if needed, to avoid dirtying a cache line.
  71  * We use a temp variable to avoid fetching jiffies twice.
  72  */
  73 static inline void tcf_lastuse_update(struct tcf_t *tm)
  74 {
  75         unsigned long now = jiffies;
  76
  77         if (tm->lastuse != now)
  78                 tm->lastuse = now;
  79 }
  80
  81 struct tc_action {
  82         void                    *priv;
  83         const struct tc_action_ops      *ops;
  84         __u32                   type; /* for backward compat(TCA_OLD_COMPAT) */
  85         __u32                   order;
  86         struct list_head        list;
  87         struct tcf_hashinfo     *hinfo;
  88 };
  89
  90 #ifdef CONFIG_NET_CLS_ACT
  91
  92 #define ACT_P_CREATED 1
  93 #define ACT_P_DELETED 1
  94
  95 struct tc_action_ops {
  96         struct list_head head;
  97         char    kind[IFNAMSIZ];
  98         __u32   type; /* TBD to match kind */
  99         struct module           *owner;
 100         int     (*act)(struct sk_buff *, const struct tc_action *, struct tcf_result *);
 101         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
 102         void    (*cleanup)(struct tc_action *, int bind);
 103         int     (*lookup)(struct net *, struct tc_action *, u32);
 104         int     (*init)(struct net *net, struct nlattr *nla,
 105                         struct nlattr *est, struct tc_action *act, int ovr,
 106                         int bind);
 107         int     (*walk)(struct net *, struct sk_buff *,
 108                         struct netlink_callback *, int, struct tc_action *);
 109         void    (*stats_update)(struct tc_action *, u64, u32, u64);
 110 };
 111
 112 struct tc_action_net {
 113         struct tcf_hashinfo *hinfo;
 114         const struct tc_action_ops *ops;
 115 };
 116
 117 static inline
 118 int tc_action_net_init(struct tc_action_net *tn, const struct tc_action_ops *ops,
 119                        unsigned int mask)
 120 {
 121         int err = 0;
 122
 123         tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL);
 124         if (!tn->hinfo)
 125                 return -ENOMEM;
 126         tn->ops = ops;
 127         err = tcf_hashinfo_init(tn->hinfo, mask);
 128         if (err)
 129                 kfree(tn->hinfo);
 130         return err;
 131 }
 132
 133 void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
 134                           struct tcf_hashinfo *hinfo);
 135
 136 static inline void tc_action_net_exit(struct tc_action_net *tn)
 137 {
 138         tcf_hashinfo_destroy(tn->ops, tn->hinfo);
 139         kfree(tn->hinfo);
 140 }
 141
 142 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 143                        struct netlink_callback *cb, int type,
 144                        struct tc_action *a);
 145 int tcf_hash_search(struct tc_action_net *tn, struct tc_action *a, u32 index);
 146 u32 tcf_hash_new_index(struct tc_action_net *tn);
 147 int tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action *a,
 148                    int bind);
 149 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 150                     struct tc_action *a, int size, int bind, bool cpustats);
 151 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
 152 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a);
 153
 154 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
 155
 156 static inline int tcf_hash_release(struct tc_action *a, bool bind)
 157 {
 158         return __tcf_hash_release(a, bind, false);
 159 }
 160
 161 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
 162 int tcf_unregister_action(struct tc_action_ops *a, struct pernet_operations *ops);
 163 int tcf_action_destroy(struct list_head *actions, int bind);
 164 int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
 165                     struct tcf_result *res);
 166 int tcf_action_init(struct net *net, struct nlattr *nla,
 167                                   struct nlattr *est, char *n, int ovr,
 168                                   int bind, struct list_head *);
 169 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
 170                                     struct nlattr *est, char *n, int ovr,
 171                                     int bind);
 172 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
 173 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
 174 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
 175 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 176
 177 #define tc_no_actions(_exts) \
 178         (list_empty(&(_exts)->actions))
 179
 180 #define tc_for_each_action(_a, _exts) \
 181         list_for_each_entry(a, &(_exts)->actions, list)
 182
 183 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
 184                                            u64 packets, u64 lastuse)
 185 {
 186         if (!a->ops->stats_update)
 187                 return;
 188
 189         a->ops->stats_update(a, bytes, packets, lastuse);
 190 }
 191
 192 #else /* CONFIG_NET_CLS_ACT */
 193
 194 #define tc_no_actions(_exts) true
 195 #define tc_for_each_action(_a, _exts) while ((void)(_a), 0)
 196 #define tcf_action_stats_update(a, bytes, packets, lastuse)
 197
 198 #endif /* CONFIG_NET_CLS_ACT */
 199 #endif