include/net/act_api.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __NET_ACT_API_H
   3 #define __NET_ACT_API_H
   4
   5 /*
   6  * Public action API for classifiers/qdiscs
   7 */
   8
   9 #include <net/sch_generic.h>
  10 #include <net/pkt_sched.h>
  11 #include <net/net_namespace.h>
  12 #include <net/netns/generic.h>
  13
  14 struct tcf_idrinfo {
  15         spinlock_t      lock;
  16         struct idr      action_idr;
  17         struct net      *net;
  18 };
  19
  20 struct tc_action_ops;
  21
  22 struct tc_action {
  23         const struct tc_action_ops      *ops;
  24         __u32                           type; /* for backward compat(TCA_OLD_COMPAT) */
  25         __u32                           order;
  26         struct list_head                list;
  27         struct tcf_idrinfo              *idrinfo;
  28
  29         u32                             tcfa_index;
  30         int                             tcfa_refcnt;
  31         int                             tcfa_bindcnt;
  32         u32                             tcfa_capab;
  33         int                             tcfa_action;
  34         struct tcf_t                    tcfa_tm;
  35         struct gnet_stats_basic_packed  tcfa_bstats;
  36         struct gnet_stats_queue         tcfa_qstats;
  37         struct net_rate_estimator __rcu *tcfa_rate_est;
  38         spinlock_t                      tcfa_lock;
  39         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
  40         struct gnet_stats_queue __percpu *cpu_qstats;
  41         struct tc_cookie        *act_cookie;
  42         struct tcf_chain        *goto_chain;
  43 };
  44 #define tcf_index       common.tcfa_index
  45 #define tcf_refcnt      common.tcfa_refcnt
  46 #define tcf_bindcnt     common.tcfa_bindcnt
  47 #define tcf_capab       common.tcfa_capab
  48 #define tcf_action      common.tcfa_action
  49 #define tcf_tm          common.tcfa_tm
  50 #define tcf_bstats      common.tcfa_bstats
  51 #define tcf_qstats      common.tcfa_qstats
  52 #define tcf_rate_est    common.tcfa_rate_est
  53 #define tcf_lock        common.tcfa_lock
  54
  55 /* Update lastuse only if needed, to avoid dirtying a cache line.
  56  * We use a temp variable to avoid fetching jiffies twice.
  57  */
  58 static inline void tcf_lastuse_update(struct tcf_t *tm)
  59 {
  60         unsigned long now = jiffies;
  61
  62         if (tm->lastuse != now)
  63                 tm->lastuse = now;
  64         if (unlikely(!tm->firstuse))
  65                 tm->firstuse = now;
  66 }
  67
  68 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
  69 {
  70         dtm->install = jiffies_to_clock_t(jiffies - stm->install);
  71         dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
  72         dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
  73         dtm->expires = jiffies_to_clock_t(stm->expires);
  74 }
  75
  76 #ifdef CONFIG_NET_CLS_ACT
  77
  78 #define ACT_P_CREATED 1
  79 #define ACT_P_DELETED 1
  80
  81 struct tc_action_ops {
  82         struct list_head head;
  83         char    kind[IFNAMSIZ];
  84         __u32   type; /* TBD to match kind */
  85         size_t  size;
  86         struct module           *owner;
  87         int     (*act)(struct sk_buff *, const struct tc_action *,
  88                        struct tcf_result *);
  89         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
  90         void    (*cleanup)(struct tc_action *, int bind);
  91         int     (*lookup)(struct net *, struct tc_action **, u32);
  92         int     (*init)(struct net *net, struct nlattr *nla,
  93                         struct nlattr *est, struct tc_action **act, int ovr,
  94                         int bind);
  95         int     (*walk)(struct net *, struct sk_buff *,
  96                         struct netlink_callback *, int, const struct tc_action_ops *);
  97         void    (*stats_update)(struct tc_action *, u64, u32, u64);
  98         struct net_device *(*get_dev)(const struct tc_action *a);
  99 };
 100
 101 struct tc_action_net {
 102         struct tcf_idrinfo *idrinfo;
 103         const struct tc_action_ops *ops;
 104 };
 105
 106 static inline
 107 int tc_action_net_init(struct net *net, struct tc_action_net *tn,
 108                        const struct tc_action_ops *ops)
 109 {
 110         int err = 0;
 111
 112         tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
 113         if (!tn->idrinfo)
 114                 return -ENOMEM;
 115         tn->ops = ops;
 116         tn->idrinfo->net = net;
 117         spin_lock_init(&tn->idrinfo->lock);
 118         idr_init(&tn->idrinfo->action_idr);
 119         return err;
 120 }
 121
 122 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
 123                          struct tcf_idrinfo *idrinfo);
 124
 125 static inline void tc_action_net_exit(struct tc_action_net *tn)
 126 {
 127         rtnl_lock();
 128         tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
 129         rtnl_unlock();
 130         kfree(tn->idrinfo);
 131 }
 132
 133 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 134                        struct netlink_callback *cb, int type,
 135                        const struct tc_action_ops *ops);
 136 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
 137 bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
 138                     int bind);
 139 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 140                    struct tc_action **a, const struct tc_action_ops *ops,
 141                    int bind, bool cpustats);
 142 void tcf_idr_cleanup(struct tc_action *a, struct nlattr *est);
 143 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
 144
 145 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
 146
 147 static inline int tcf_idr_release(struct tc_action *a, bool bind)
 148 {
 149         return __tcf_idr_release(a, bind, false);
 150 }
 151
 152 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
 153 int tcf_unregister_action(struct tc_action_ops *a,
 154                           struct pernet_operations *ops);
 155 int tcf_action_destroy(struct list_head *actions, int bind);
 156 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
 157                     int nr_actions, struct tcf_result *res);
 158 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
 159                     struct nlattr *est, char *name, int ovr, int bind,
 160                     struct list_head *actions);
 161 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 162                                     struct nlattr *nla, struct nlattr *est,
 163                                     char *name, int ovr, int bind);
 164 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
 165 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
 166 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
 167 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 168
 169 #endif /* CONFIG_NET_CLS_ACT */
 170
 171 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
 172                                            u64 packets, u64 lastuse)
 173 {
 174 #ifdef CONFIG_NET_CLS_ACT
 175         if (!a->ops->stats_update)
 176                 return;
 177
 178         a->ops->stats_update(a, bytes, packets, lastuse);
 179 #endif
 180 }
 181
 182 typedef int tc_setup_cb_t(enum tc_setup_type type,
 183                           void *type_data, void *cb_priv);
 184
 185 #ifdef CONFIG_NET_CLS_ACT
 186 int tc_setup_cb_egdev_register(const struct net_device *dev,
 187                                tc_setup_cb_t *cb, void *cb_priv);
 188 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
 189                                   tc_setup_cb_t *cb, void *cb_priv);
 190 int tc_setup_cb_egdev_call(const struct net_device *dev,
 191                            enum tc_setup_type type, void *type_data,
 192                            bool err_stop);
 193 #else
 194 static inline
 195 int tc_setup_cb_egdev_register(const struct net_device *dev,
 196                                tc_setup_cb_t *cb, void *cb_priv)
 197 {
 198         return 0;
 199 }
 200
 201 static inline
 202 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
 203                                   tc_setup_cb_t *cb, void *cb_priv)
 204 {
 205 }
 206
 207 static inline
 208 int tc_setup_cb_egdev_call(const struct net_device *dev,
 209                            enum tc_setup_type type, void *type_data,
 210                            bool err_stop)
 211 {
 212         return 0;
 213 }
 214 #endif
 215
 216 #endif