include/net/act_api.h

   1 #ifndef __NET_ACT_API_H
   2 #define __NET_ACT_API_H
   3
   4 /*
   5  * Public 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
  14 struct tcf_hashinfo {
  15         struct hlist_head       *htab;
  16         unsigned int            hmask;
  17         spinlock_t              lock;
  18         u32                     index;
  19 };
  20
  21 struct tc_action_ops;
  22
  23 struct tc_action {
  24         const struct tc_action_ops      *ops;
  25         __u32                           type; /* for backward compat(TCA_OLD_COMPAT) */
  26         __u32                           order;
  27         struct list_head                list;
  28         struct tcf_hashinfo             *hinfo;
  29
  30         struct hlist_node               tcfa_head;
  31         u32                             tcfa_index;
  32         int                             tcfa_refcnt;
  33         int                             tcfa_bindcnt;
  34         u32                             tcfa_capab;
  35         int                             tcfa_action;
  36         struct tcf_t                    tcfa_tm;
  37         struct gnet_stats_basic_packed  tcfa_bstats;
  38         struct gnet_stats_queue         tcfa_qstats;
  39         struct gnet_stats_rate_est64    tcfa_rate_est;
  40         spinlock_t                      tcfa_lock;
  41         struct rcu_head                 tcfa_rcu;
  42         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
  43         struct gnet_stats_queue __percpu *cpu_qstats;
  44 };
  45 #define tcf_act         common.tcfa_act
  46 #define tcf_head        common.tcfa_head
  47 #define tcf_index       common.tcfa_index
  48 #define tcf_refcnt      common.tcfa_refcnt
  49 #define tcf_bindcnt     common.tcfa_bindcnt
  50 #define tcf_capab       common.tcfa_capab
  51 #define tcf_action      common.tcfa_action
  52 #define tcf_tm          common.tcfa_tm
  53 #define tcf_bstats      common.tcfa_bstats
  54 #define tcf_qstats      common.tcfa_qstats
  55 #define tcf_rate_est    common.tcfa_rate_est
  56 #define tcf_lock        common.tcfa_lock
  57 #define tcf_rcu         common.tcfa_rcu
  58
  59 static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
  60 {
  61         return index & hmask;
  62 }
  63
  64 static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
  65 {
  66         int i;
  67
  68         spin_lock_init(&hf->lock);
  69         hf->index = 0;
  70         hf->hmask = mask;
  71         hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
  72                            GFP_KERNEL);
  73         if (!hf->htab)
  74                 return -ENOMEM;
  75         for (i = 0; i < mask + 1; i++)
  76                 INIT_HLIST_HEAD(&hf->htab[i]);
  77         return 0;
  78 }
  79
  80 /* Update lastuse only if needed, to avoid dirtying a cache line.
  81  * We use a temp variable to avoid fetching jiffies twice.
  82  */
  83 static inline void tcf_lastuse_update(struct tcf_t *tm)
  84 {
  85         unsigned long now = jiffies;
  86
  87         if (tm->lastuse != now)
  88                 tm->lastuse = now;
  89         if (unlikely(!tm->firstuse))
  90                 tm->firstuse = now;
  91 }
  92
  93 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
  94 {
  95         dtm->install = jiffies_to_clock_t(jiffies - stm->install);
  96         dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
  97         dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
  98         dtm->expires = jiffies_to_clock_t(stm->expires);
  99 }
 100
 101 #ifdef CONFIG_NET_CLS_ACT
 102
 103 #define ACT_P_CREATED 1
 104 #define ACT_P_DELETED 1
 105
 106 struct tc_action_ops {
 107         struct list_head head;
 108         char    kind[IFNAMSIZ];
 109         __u32   type; /* TBD to match kind */
 110         size_t  size;
 111         struct module           *owner;
 112         int     (*act)(struct sk_buff *, const struct tc_action *,
 113                        struct tcf_result *);
 114         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
 115         void    (*cleanup)(struct tc_action *, int bind);
 116         int     (*lookup)(struct net *, struct tc_action **, u32);
 117         int     (*init)(struct net *net, struct nlattr *nla,
 118                         struct nlattr *est, struct tc_action **act, int ovr,
 119                         int bind);
 120         int     (*walk)(struct net *, struct sk_buff *,
 121                         struct netlink_callback *, int, const struct tc_action_ops *);
 122         void    (*stats_update)(struct tc_action *, u64, u32, u64);
 123 };
 124
 125 struct tc_action_net {
 126         struct tcf_hashinfo *hinfo;
 127         const struct tc_action_ops *ops;
 128 };
 129
 130 static inline
 131 int tc_action_net_init(struct tc_action_net *tn,
 132                        const struct tc_action_ops *ops, unsigned int mask)
 133 {
 134         int err = 0;
 135
 136         tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL);
 137         if (!tn->hinfo)
 138                 return -ENOMEM;
 139         tn->ops = ops;
 140         err = tcf_hashinfo_init(tn->hinfo, mask);
 141         if (err)
 142                 kfree(tn->hinfo);
 143         return err;
 144 }
 145
 146 void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
 147                           struct tcf_hashinfo *hinfo);
 148
 149 static inline void tc_action_net_exit(struct tc_action_net *tn)
 150 {
 151         tcf_hashinfo_destroy(tn->ops, tn->hinfo);
 152         kfree(tn->hinfo);
 153 }
 154
 155 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 156                        struct netlink_callback *cb, int type,
 157                        const struct tc_action_ops *ops);
 158 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
 159 u32 tcf_hash_new_index(struct tc_action_net *tn);
 160 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
 161                     int bind);
 162 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 163                     struct tc_action **a, const struct tc_action_ops *ops, int bind,
 164                     bool cpustats);
 165 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
 166 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a);
 167
 168 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
 169
 170 static inline int tcf_hash_release(struct tc_action *a, bool bind)
 171 {
 172         return __tcf_hash_release(a, bind, false);
 173 }
 174
 175 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
 176 int tcf_unregister_action(struct tc_action_ops *a,
 177                           struct pernet_operations *ops);
 178 int tcf_action_destroy(struct list_head *actions, int bind);
 179 int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
 180                     struct tcf_result *res);
 181 int tcf_action_init(struct net *net, struct nlattr *nla,
 182                                   struct nlattr *est, char *n, int ovr,
 183                                   int bind, struct list_head *);
 184 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
 185                                     struct nlattr *est, char *n, int ovr,
 186                                     int bind);
 187 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
 188 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
 189 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
 190 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 191
 192 #define tc_no_actions(_exts) \
 193         (list_empty(&(_exts)->actions))
 194
 195 #define tc_for_each_action(_a, _exts) \
 196         list_for_each_entry(a, &(_exts)->actions, list)
 197
 198 #define tc_single_action(_exts) \
 199         (list_is_singular(&(_exts)->actions))
 200
 201 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
 202                                            u64 packets, u64 lastuse)
 203 {
 204         if (!a->ops->stats_update)
 205                 return;
 206
 207         a->ops->stats_update(a, bytes, packets, lastuse);
 208 }
 209
 210 #else /* CONFIG_NET_CLS_ACT */
 211
 212 #define tc_no_actions(_exts) true
 213 #define tc_for_each_action(_a, _exts) while ((void)(_a), 0)
 214 #define tc_single_action(_exts) false
 215 #define tcf_action_stats_update(a, bytes, packets, lastuse)
 216
 217 #endif /* CONFIG_NET_CLS_ACT */
 218 #endif