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 <linux/refcount.h>
  10 #include <net/sch_generic.h>
  11 #include <net/pkt_sched.h>
  12 #include <net/net_namespace.h>
  13 #include <net/netns/generic.h>
  14
  15 struct tcf_idrinfo {
  16         spinlock_t      lock;
  17         struct idr      action_idr;
  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 tcf_idrinfo              *idrinfo;
  27
  28         u32                             tcfa_index;
  29         refcount_t                      tcfa_refcnt;
  30         atomic_t                        tcfa_bindcnt;
  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        __rcu *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_action      common.tcfa_action
  46 #define tcf_tm          common.tcfa_tm
  47 #define tcf_bstats      common.tcfa_bstats
  48 #define tcf_qstats      common.tcfa_qstats
  49 #define tcf_rate_est    common.tcfa_rate_est
  50 #define tcf_lock        common.tcfa_lock
  51
  52 /* Update lastuse only if needed, to avoid dirtying a cache line.
  53  * We use a temp variable to avoid fetching jiffies twice.
  54  */
  55 static inline void tcf_lastuse_update(struct tcf_t *tm)
  56 {
  57         unsigned long now = jiffies;
  58
  59         if (tm->lastuse != now)
  60                 tm->lastuse = now;
  61         if (unlikely(!tm->firstuse))
  62                 tm->firstuse = now;
  63 }
  64
  65 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
  66 {
  67         dtm->install = jiffies_to_clock_t(jiffies - stm->install);
  68         dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
  69         dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
  70         dtm->expires = jiffies_to_clock_t(stm->expires);
  71 }
  72
  73 #ifdef CONFIG_NET_CLS_ACT
  74
  75 #define ACT_P_CREATED 1
  76 #define ACT_P_DELETED 1
  77
  78 struct tc_action_ops {
  79         struct list_head head;
  80         char    kind[IFNAMSIZ];
  81         __u32   type; /* TBD to match kind */
  82         size_t  size;
  83         struct module           *owner;
  84         int     (*act)(struct sk_buff *, const struct tc_action *,
  85                        struct tcf_result *); /* called under RCU BH lock*/
  86         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
  87         void    (*cleanup)(struct tc_action *);
  88         int     (*lookup)(struct net *net, struct tc_action **a, u32 index,
  89                           struct netlink_ext_ack *extack);
  90         int     (*init)(struct net *net, struct nlattr *nla,
  91                         struct nlattr *est, struct tc_action **act, int ovr,
  92                         int bind, bool rtnl_held,
  93                         struct netlink_ext_ack *extack);
  94         int     (*walk)(struct net *, struct sk_buff *,
  95                         struct netlink_callback *, int,
  96                         const struct tc_action_ops *,
  97                         struct netlink_ext_ack *);
  98         void    (*stats_update)(struct tc_action *, u64, u32, u64);
  99         size_t  (*get_fill_size)(const struct tc_action *act);
 100         struct net_device *(*get_dev)(const struct tc_action *a);
 101         void    (*put_dev)(struct net_device *dev);
 102 };
 103
 104 struct tc_action_net {
 105         struct tcf_idrinfo *idrinfo;
 106         const struct tc_action_ops *ops;
 107 };
 108
 109 static inline
 110 int tc_action_net_init(struct tc_action_net *tn,
 111                        const struct tc_action_ops *ops)
 112 {
 113         int err = 0;
 114
 115         tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
 116         if (!tn->idrinfo)
 117                 return -ENOMEM;
 118         tn->ops = ops;
 119         spin_lock_init(&tn->idrinfo->lock);
 120         idr_init(&tn->idrinfo->action_idr);
 121         return err;
 122 }
 123
 124 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
 125                          struct tcf_idrinfo *idrinfo);
 126
 127 static inline void tc_action_net_exit(struct list_head *net_list,
 128                                       unsigned int id)
 129 {
 130         struct net *net;
 131
 132         rtnl_lock();
 133         list_for_each_entry(net, net_list, exit_list) {
 134                 struct tc_action_net *tn = net_generic(net, id);
 135
 136                 tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
 137                 kfree(tn->idrinfo);
 138         }
 139         rtnl_unlock();
 140 }
 141
 142 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 143                        struct netlink_callback *cb, int type,
 144                        const struct tc_action_ops *ops,
 145                        struct netlink_ext_ack *extack);
 146 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
 147 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 148                    struct tc_action **a, const struct tc_action_ops *ops,
 149                    int bind, bool cpustats);
 150 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
 151
 152 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
 153 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
 154                         struct tc_action **a, int bind);
 155 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
 156
 157 static inline int tcf_idr_release(struct tc_action *a, bool bind)
 158 {
 159         return __tcf_idr_release(a, bind, false);
 160 }
 161
 162 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
 163 int tcf_unregister_action(struct tc_action_ops *a,
 164                           struct pernet_operations *ops);
 165 int tcf_action_destroy(struct tc_action *actions[], int bind);
 166 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
 167                     int nr_actions, struct tcf_result *res);
 168 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
 169                     struct nlattr *est, char *name, int ovr, int bind,
 170                     struct tc_action *actions[], size_t *attr_size,
 171                     bool rtnl_held, struct netlink_ext_ack *extack);
 172 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 173                                     struct nlattr *nla, struct nlattr *est,
 174                                     char *name, int ovr, int bind,
 175                                     bool rtnl_held,
 176                                     struct netlink_ext_ack *extack);
 177 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
 178                     int ref);
 179 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
 180 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
 181 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 182
 183 #endif /* CONFIG_NET_CLS_ACT */
 184
 185 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
 186                                            u64 packets, u64 lastuse)
 187 {
 188 #ifdef CONFIG_NET_CLS_ACT
 189         if (!a->ops->stats_update)
 190                 return;
 191
 192         a->ops->stats_update(a, bytes, packets, lastuse);
 193 #endif
 194 }
 195
 196 #ifdef CONFIG_NET_CLS_ACT
 197 int tc_setup_cb_egdev_register(const struct net_device *dev,
 198                                tc_setup_cb_t *cb, void *cb_priv);
 199 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
 200                                   tc_setup_cb_t *cb, void *cb_priv);
 201 int tc_setup_cb_egdev_call(const struct net_device *dev,
 202                            enum tc_setup_type type, void *type_data,
 203                            bool err_stop);
 204 #else
 205 static inline
 206 int tc_setup_cb_egdev_register(const struct net_device *dev,
 207                                tc_setup_cb_t *cb, void *cb_priv)
 208 {
 209         return 0;
 210 }
 211
 212 static inline
 213 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
 214                                   tc_setup_cb_t *cb, void *cb_priv)
 215 {
 216 }
 217
 218 static inline
 219 int tc_setup_cb_egdev_call(const struct net_device *dev,
 220                            enum tc_setup_type type, void *type_data,
 221                            bool err_stop)
 222 {
 223         return 0;
 224 }
 225 #endif
 226
 227 #endif