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 struct tcf_idrinfo {
  14         spinlock_t      lock;
  15         struct idr      action_idr;
  16 };
  17
  18 struct tc_action_ops;
  19
  20 struct tc_action {
  21         const struct tc_action_ops      *ops;
  22         __u32                           type; /* for backward compat(TCA_OLD_COMPAT) */
  23         __u32                           order;
  24         struct list_head                list;
  25         struct tcf_idrinfo              *idrinfo;
  26
  27         u32                             tcfa_index;
  28         int                             tcfa_refcnt;
  29         int                             tcfa_bindcnt;
  30         u32                             tcfa_capab;
  31         int                             tcfa_action;
  32         struct tcf_t                    tcfa_tm;
  33         struct gnet_stats_basic_packed  tcfa_bstats;
  34         struct gnet_stats_queue         tcfa_qstats;
  35         struct net_rate_estimator __rcu *tcfa_rate_est;
  36         spinlock_t                      tcfa_lock;
  37         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
  38         struct gnet_stats_queue __percpu *cpu_qstats;
  39         struct tc_cookie        *act_cookie;
  40         struct tcf_chain        *goto_chain;
  41 };
  42 #define tcf_index       common.tcfa_index
  43 #define tcf_refcnt      common.tcfa_refcnt
  44 #define tcf_bindcnt     common.tcfa_bindcnt
  45 #define tcf_capab       common.tcfa_capab
  46 #define tcf_action      common.tcfa_action
  47 #define tcf_tm          common.tcfa_tm
  48 #define tcf_bstats      common.tcfa_bstats
  49 #define tcf_qstats      common.tcfa_qstats
  50 #define tcf_rate_est    common.tcfa_rate_est
  51 #define tcf_lock        common.tcfa_lock
  52
  53 /* Update lastuse only if needed, to avoid dirtying a cache line.
  54  * We use a temp variable to avoid fetching jiffies twice.
  55  */
  56 static inline void tcf_lastuse_update(struct tcf_t *tm)
  57 {
  58         unsigned long now = jiffies;
  59
  60         if (tm->lastuse != now)
  61                 tm->lastuse = now;
  62         if (unlikely(!tm->firstuse))
  63                 tm->firstuse = now;
  64 }
  65
  66 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
  67 {
  68         dtm->install = jiffies_to_clock_t(jiffies - stm->install);
  69         dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
  70         dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
  71         dtm->expires = jiffies_to_clock_t(stm->expires);
  72 }
  73
  74 #ifdef CONFIG_NET_CLS_ACT
  75
  76 #define ACT_P_CREATED 1
  77 #define ACT_P_DELETED 1
  78
  79 struct tc_action_ops {
  80         struct list_head head;
  81         char    kind[IFNAMSIZ];
  82         __u32   type; /* TBD to match kind */
  83         size_t  size;
  84         struct module           *owner;
  85         int     (*act)(struct sk_buff *, const struct tc_action *,
  86                        struct tcf_result *);
  87         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
  88         void    (*cleanup)(struct tc_action *, int bind);
  89         int     (*lookup)(struct net *, struct tc_action **, u32);
  90         int     (*init)(struct net *net, struct nlattr *nla,
  91                         struct nlattr *est, struct tc_action **act, int ovr,
  92                         int bind);
  93         int     (*walk)(struct net *, struct sk_buff *,
  94                         struct netlink_callback *, int, const struct tc_action_ops *);
  95         void    (*stats_update)(struct tc_action *, u64, u32, u64);
  96         int     (*get_dev)(const struct tc_action *a, struct net *net,
  97                            struct net_device **mirred_dev);
  98 };
  99
 100 struct tc_action_net {
 101         struct tcf_idrinfo *idrinfo;
 102         const struct tc_action_ops *ops;
 103 };
 104
 105 static inline
 106 int tc_action_net_init(struct tc_action_net *tn,
 107                        const struct tc_action_ops *ops)
 108 {
 109         int err = 0;
 110
 111         tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
 112         if (!tn->idrinfo)
 113                 return -ENOMEM;
 114         tn->ops = ops;
 115         spin_lock_init(&tn->idrinfo->lock);
 116         idr_init(&tn->idrinfo->action_idr);
 117         return err;
 118 }
 119
 120 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
 121                          struct tcf_idrinfo *idrinfo);
 122
 123 static inline void tc_action_net_exit(struct tc_action_net *tn)
 124 {
 125         tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
 126         kfree(tn->idrinfo);
 127 }
 128
 129 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 130                        struct netlink_callback *cb, int type,
 131                        const struct tc_action_ops *ops);
 132 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
 133 bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
 134                     int bind);
 135 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 136                    struct tc_action **a, const struct tc_action_ops *ops,
 137                    int bind, bool cpustats);
 138 void tcf_idr_cleanup(struct tc_action *a, struct nlattr *est);
 139 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
 140
 141 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
 142
 143 static inline int tcf_idr_release(struct tc_action *a, bool bind)
 144 {
 145         return __tcf_idr_release(a, bind, false);
 146 }
 147
 148 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
 149 int tcf_unregister_action(struct tc_action_ops *a,
 150                           struct pernet_operations *ops);
 151 int tcf_action_destroy(struct list_head *actions, int bind);
 152 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
 153                     int nr_actions, struct tcf_result *res);
 154 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
 155                     struct nlattr *est, char *name, int ovr, int bind,
 156                     struct list_head *actions);
 157 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 158                                     struct nlattr *nla, struct nlattr *est,
 159                                     char *name, int ovr, int bind);
 160 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
 161 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
 162 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
 163 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 164
 165 #endif /* CONFIG_NET_CLS_ACT */
 166
 167 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
 168                                            u64 packets, u64 lastuse)
 169 {
 170 #ifdef CONFIG_NET_CLS_ACT
 171         if (!a->ops->stats_update)
 172                 return;
 173
 174         a->ops->stats_update(a, bytes, packets, lastuse);
 175 #endif
 176 }
 177
 178 #endif