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 net_rate_estimator __rcu *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         struct tc_cookie        *act_cookie;
  45         struct tcf_chain        *goto_chain;
  46 };
  47 #define tcf_head        common.tcfa_head
  48 #define tcf_index       common.tcfa_index
  49 #define tcf_refcnt      common.tcfa_refcnt
  50 #define tcf_bindcnt     common.tcfa_bindcnt
  51 #define tcf_capab       common.tcfa_capab
  52 #define tcf_action      common.tcfa_action
  53 #define tcf_tm          common.tcfa_tm
  54 #define tcf_bstats      common.tcfa_bstats
  55 #define tcf_qstats      common.tcfa_qstats
  56 #define tcf_rate_est    common.tcfa_rate_est
  57 #define tcf_lock        common.tcfa_lock
  58 #define tcf_rcu         common.tcfa_rcu
  59
  60 static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
  61 {
  62         return index & hmask;
  63 }
  64
  65 static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
  66 {
  67         int i;
  68
  69         spin_lock_init(&hf->lock);
  70         hf->index = 0;
  71         hf->hmask = mask;
  72         hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
  73                            GFP_KERNEL);
  74         if (!hf->htab)
  75                 return -ENOMEM;
  76         for (i = 0; i < mask + 1; i++)
  77                 INIT_HLIST_HEAD(&hf->htab[i]);
  78         return 0;
  79 }
  80
  81 /* Update lastuse only if needed, to avoid dirtying a cache line.
  82  * We use a temp variable to avoid fetching jiffies twice.
  83  */
  84 static inline void tcf_lastuse_update(struct tcf_t *tm)
  85 {
  86         unsigned long now = jiffies;
  87
  88         if (tm->lastuse != now)
  89                 tm->lastuse = now;
  90         if (unlikely(!tm->firstuse))
  91                 tm->firstuse = now;
  92 }
  93
  94 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
  95 {
  96         dtm->install = jiffies_to_clock_t(jiffies - stm->install);
  97         dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
  98         dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
  99         dtm->expires = jiffies_to_clock_t(stm->expires);
 100 }
 101
 102 #ifdef CONFIG_NET_CLS_ACT
 103
 104 #define ACT_P_CREATED 1
 105 #define ACT_P_DELETED 1
 106
 107 struct tc_action_ops {
 108         struct list_head head;
 109         char    kind[IFNAMSIZ];
 110         __u32   type; /* TBD to match kind */
 111         size_t  size;
 112         struct module           *owner;
 113         int     (*act)(struct sk_buff *, const struct tc_action *,
 114                        struct tcf_result *);
 115         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
 116         void    (*cleanup)(struct tc_action *, int bind);
 117         int     (*lookup)(struct net *, struct tc_action **, u32);
 118         int     (*init)(struct net *net, struct nlattr *nla,
 119                         struct nlattr *est, struct tc_action **act, int ovr,
 120                         int bind);
 121         int     (*walk)(struct net *, struct sk_buff *,
 122                         struct netlink_callback *, int, const struct tc_action_ops *);
 123         void    (*stats_update)(struct tc_action *, u64, u32, u64);
 124         int     (*get_dev)(const struct tc_action *a, struct net *net,
 125                            struct net_device **mirred_dev);
 126 };
 127
 128 struct tc_action_net {
 129         struct tcf_hashinfo *hinfo;
 130         const struct tc_action_ops *ops;
 131 };
 132
 133 static inline
 134 int tc_action_net_init(struct tc_action_net *tn,
 135                        const struct tc_action_ops *ops, unsigned int mask)
 136 {
 137         int err = 0;
 138
 139         tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL);
 140         if (!tn->hinfo)
 141                 return -ENOMEM;
 142         tn->ops = ops;
 143         err = tcf_hashinfo_init(tn->hinfo, mask);
 144         if (err)
 145                 kfree(tn->hinfo);
 146         return err;
 147 }
 148
 149 void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
 150                           struct tcf_hashinfo *hinfo);
 151
 152 static inline void tc_action_net_exit(struct tc_action_net *tn)
 153 {
 154         tcf_hashinfo_destroy(tn->ops, tn->hinfo);
 155         kfree(tn->hinfo);
 156 }
 157
 158 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 159                        struct netlink_callback *cb, int type,
 160                        const struct tc_action_ops *ops);
 161 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
 162 u32 tcf_hash_new_index(struct tc_action_net *tn);
 163 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
 164                     int bind);
 165 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 166                     struct tc_action **a, const struct tc_action_ops *ops, int bind,
 167                     bool cpustats);
 168 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
 169 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a);
 170
 171 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
 172
 173 static inline int tcf_hash_release(struct tc_action *a, bool bind)
 174 {
 175         return __tcf_hash_release(a, bind, false);
 176 }
 177
 178 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
 179 int tcf_unregister_action(struct tc_action_ops *a,
 180                           struct pernet_operations *ops);
 181 int tcf_action_destroy(struct list_head *actions, int bind);
 182 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
 183                     int nr_actions, struct tcf_result *res);
 184 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
 185                     struct nlattr *est, char *name, int ovr, int bind,
 186                     struct list_head *actions);
 187 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 188                                     struct nlattr *nla, struct nlattr *est,
 189                                     char *name, int ovr, int bind);
 190 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
 191 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
 192 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
 193 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 194
 195 #endif /* CONFIG_NET_CLS_ACT */
 196
 197 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
 198                                            u64 packets, u64 lastuse)
 199 {
 200 #ifdef CONFIG_NET_CLS_ACT
 201         if (!a->ops->stats_update)
 202                 return;
 203
 204         a->ops->stats_update(a, bytes, packets, lastuse);
 205 #endif
 206 }
 207
 208 #endif