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         struct mutex    lock;
  17         struct idr      action_idr;
  18         struct net      *net;
  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         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_basic_packed  tcfa_bstats_hw;
  35         struct gnet_stats_queue         tcfa_qstats;
  36         struct net_rate_estimator __rcu *tcfa_rate_est;
  37         spinlock_t                      tcfa_lock;
  38         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
  39         struct gnet_stats_basic_cpu __percpu *cpu_bstats_hw;
  40         struct gnet_stats_queue __percpu *cpu_qstats;
  41         struct tc_cookie        __rcu *act_cookie;
  42         struct tcf_chain        __rcu *goto_chain;
  43         u32                     tcfa_flags;
  44         u8                      hw_stats;
  45         u8                      used_hw_stats;
  46         bool                    used_hw_stats_valid;
  47 };
  48 #define tcf_index       common.tcfa_index
  49 #define tcf_refcnt      common.tcfa_refcnt
  50 #define tcf_bindcnt     common.tcfa_bindcnt
  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
  58 #define TCA_ACT_HW_STATS_ANY (TCA_ACT_HW_STATS_IMMEDIATE | \
  59                               TCA_ACT_HW_STATS_DELAYED)
  60
  61 /* Update lastuse only if needed, to avoid dirtying a cache line.
  62  * We use a temp variable to avoid fetching jiffies twice.
  63  */
  64 static inline void tcf_lastuse_update(struct tcf_t *tm)
  65 {
  66         unsigned long now = jiffies;
  67
  68         if (tm->lastuse != now)
  69                 tm->lastuse = now;
  70         if (unlikely(!tm->firstuse))
  71                 tm->firstuse = now;
  72 }
  73
  74 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
  75 {
  76         dtm->install = jiffies_to_clock_t(jiffies - stm->install);
  77         dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
  78         dtm->firstuse = stm->firstuse ?
  79                 jiffies_to_clock_t(jiffies - stm->firstuse) : 0;
  80         dtm->expires = jiffies_to_clock_t(stm->expires);
  81 }
  82
  83 #ifdef CONFIG_NET_CLS_ACT
  84
  85 #define ACT_P_CREATED 1
  86 #define ACT_P_DELETED 1
  87
  88 typedef void (*tc_action_priv_destructor)(void *priv);
  89
  90 struct tc_action_ops {
  91         struct list_head head;
  92         char    kind[IFNAMSIZ];
  93         enum tca_id  id; /* identifier should match kind */
  94         size_t  size;
  95         struct module           *owner;
  96         int     (*act)(struct sk_buff *, const struct tc_action *,
  97                        struct tcf_result *); /* called under RCU BH lock*/
  98         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
  99         void    (*cleanup)(struct tc_action *);
 100         int     (*lookup)(struct net *net, struct tc_action **a, u32 index);
 101         int     (*init)(struct net *net, struct nlattr *nla,
 102                         struct nlattr *est, struct tc_action **act, int ovr,
 103                         int bind, bool rtnl_held, struct tcf_proto *tp,
 104                         u32 flags, struct netlink_ext_ack *extack);
 105         int     (*walk)(struct net *, struct sk_buff *,
 106                         struct netlink_callback *, int,
 107                         const struct tc_action_ops *,
 108                         struct netlink_ext_ack *);
 109         void    (*stats_update)(struct tc_action *, u64, u64, u64, u64, bool);
 110         size_t  (*get_fill_size)(const struct tc_action *act);
 111         struct net_device *(*get_dev)(const struct tc_action *a,
 112                                       tc_action_priv_destructor *destructor);
 113         struct psample_group *
 114         (*get_psample_group)(const struct tc_action *a,
 115                              tc_action_priv_destructor *destructor);
 116 };
 117
 118 struct tc_action_net {
 119         struct tcf_idrinfo *idrinfo;
 120         const struct tc_action_ops *ops;
 121 };
 122
 123 static inline
 124 int tc_action_net_init(struct net *net, struct tc_action_net *tn,
 125                        const struct tc_action_ops *ops)
 126 {
 127         int err = 0;
 128
 129         tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
 130         if (!tn->idrinfo)
 131                 return -ENOMEM;
 132         tn->ops = ops;
 133         tn->idrinfo->net = net;
 134         mutex_init(&tn->idrinfo->lock);
 135         idr_init(&tn->idrinfo->action_idr);
 136         return err;
 137 }
 138
 139 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
 140                          struct tcf_idrinfo *idrinfo);
 141
 142 static inline void tc_action_net_exit(struct list_head *net_list,
 143                                       unsigned int id)
 144 {
 145         struct net *net;
 146
 147         rtnl_lock();
 148         list_for_each_entry(net, net_list, exit_list) {
 149                 struct tc_action_net *tn = net_generic(net, id);
 150
 151                 tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
 152                 kfree(tn->idrinfo);
 153         }
 154         rtnl_unlock();
 155 }
 156
 157 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 158                        struct netlink_callback *cb, int type,
 159                        const struct tc_action_ops *ops,
 160                        struct netlink_ext_ack *extack);
 161 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
 162 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 163                    struct tc_action **a, const struct tc_action_ops *ops,
 164                    int bind, bool cpustats, u32 flags);
 165 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
 166                               struct nlattr *est, struct tc_action **a,
 167                               const struct tc_action_ops *ops, int bind,
 168                               u32 flags);
 169 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
 170 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
 171                         struct tc_action **a, int bind);
 172 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
 173
 174 static inline int tcf_idr_release(struct tc_action *a, bool bind)
 175 {
 176         return __tcf_idr_release(a, bind, false);
 177 }
 178
 179 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
 180 int tcf_unregister_action(struct tc_action_ops *a,
 181                           struct pernet_operations *ops);
 182 int tcf_action_destroy(struct tc_action *actions[], int bind);
 183 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
 184                     int nr_actions, struct tcf_result *res);
 185 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
 186                     struct nlattr *est, char *name, int ovr, int bind,
 187                     struct tc_action *actions[], size_t *attr_size,
 188                     bool rtnl_held, struct netlink_ext_ack *extack);
 189 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 190                                     struct nlattr *nla, struct nlattr *est,
 191                                     char *name, int ovr, int bind,
 192                                     bool rtnl_held,
 193                                     struct netlink_ext_ack *extack);
 194 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
 195                     int ref, bool terse);
 196 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
 197 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
 198
 199 static inline void tcf_action_update_bstats(struct tc_action *a,
 200                                             struct sk_buff *skb)
 201 {
 202         if (likely(a->cpu_bstats)) {
 203                 bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), skb);
 204                 return;
 205         }
 206         spin_lock(&a->tcfa_lock);
 207         bstats_update(&a->tcfa_bstats, skb);
 208         spin_unlock(&a->tcfa_lock);
 209 }
 210
 211 static inline void tcf_action_inc_drop_qstats(struct tc_action *a)
 212 {
 213         if (likely(a->cpu_qstats)) {
 214                 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats));
 215                 return;
 216         }
 217         spin_lock(&a->tcfa_lock);
 218         qstats_drop_inc(&a->tcfa_qstats);
 219         spin_unlock(&a->tcfa_lock);
 220 }
 221
 222 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a)
 223 {
 224         if (likely(a->cpu_qstats)) {
 225                 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats));
 226                 return;
 227         }
 228         spin_lock(&a->tcfa_lock);
 229         qstats_overlimit_inc(&a->tcfa_qstats);
 230         spin_unlock(&a->tcfa_lock);
 231 }
 232
 233 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
 234                              u64 drops, bool hw);
 235 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 236
 237 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
 238                              struct tcf_chain **handle,
 239                              struct netlink_ext_ack *newchain);
 240 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
 241                                          struct tcf_chain *newchain);
 242
 243 #ifdef CONFIG_INET
 244 DECLARE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
 245 #endif
 246
 247 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
 248 #endif /* CONFIG_NET_CLS_ACT */
 249
 250 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
 251                                            u64 packets, u64 drops,
 252                                            u64 lastuse, bool hw)
 253 {
 254 #ifdef CONFIG_NET_CLS_ACT
 255         if (!a->ops->stats_update)
 256                 return;
 257
 258         a->ops->stats_update(a, bytes, packets, drops, lastuse, hw);
 259 #endif
 260 }
 261
 262
 263 #endif