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/flow_offload.h>
  11 #include <net/sch_generic.h>
  12 #include <net/pkt_sched.h>
  13 #include <net/net_namespace.h>
  14 #include <net/netns/generic.h>
  15
  16 struct tcf_idrinfo {
  17         struct mutex    lock;
  18         struct idr      action_idr;
  19         struct net      *net;
  20 };
  21
  22 struct tc_action_ops;
  23
  24 struct tc_action {
  25         const struct tc_action_ops      *ops;
  26         __u32                           type; /* for backward compat(TCA_OLD_COMPAT) */
  27         struct tcf_idrinfo              *idrinfo;
  28
  29         u32                             tcfa_index;
  30         refcount_t                      tcfa_refcnt;
  31         atomic_t                        tcfa_bindcnt;
  32         int                             tcfa_action;
  33         struct tcf_t                    tcfa_tm;
  34         struct gnet_stats_basic_sync    tcfa_bstats;
  35         struct gnet_stats_basic_sync    tcfa_bstats_hw;
  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_sync __percpu *cpu_bstats;
  40         struct gnet_stats_basic_sync __percpu *cpu_bstats_hw;
  41         struct gnet_stats_queue __percpu *cpu_qstats;
  42         struct tc_cookie        __rcu *act_cookie;
  43         struct tcf_chain        __rcu *goto_chain;
  44         u32                     tcfa_flags;
  45         u8                      hw_stats;
  46         u8                      used_hw_stats;
  47         bool                    used_hw_stats_valid;
  48         u32                     in_hw_count;
  49 };
  50 #define tcf_index       common.tcfa_index
  51 #define tcf_refcnt      common.tcfa_refcnt
  52 #define tcf_bindcnt     common.tcfa_bindcnt
  53 #define tcf_action      common.tcfa_action
  54 #define tcf_tm          common.tcfa_tm
  55 #define tcf_bstats      common.tcfa_bstats
  56 #define tcf_qstats      common.tcfa_qstats
  57 #define tcf_rate_est    common.tcfa_rate_est
  58 #define tcf_lock        common.tcfa_lock
  59
  60 #define TCA_ACT_HW_STATS_ANY (TCA_ACT_HW_STATS_IMMEDIATE | \
  61                               TCA_ACT_HW_STATS_DELAYED)
  62
  63 /* Reserve 16 bits for user-space. See TCA_ACT_FLAGS_NO_PERCPU_STATS. */
  64 #define TCA_ACT_FLAGS_USER_BITS 16
  65 #define TCA_ACT_FLAGS_USER_MASK 0xffff
  66 #define TCA_ACT_FLAGS_POLICE    (1U << TCA_ACT_FLAGS_USER_BITS)
  67 #define TCA_ACT_FLAGS_BIND      (1U << (TCA_ACT_FLAGS_USER_BITS + 1))
  68 #define TCA_ACT_FLAGS_REPLACE   (1U << (TCA_ACT_FLAGS_USER_BITS + 2))
  69 #define TCA_ACT_FLAGS_NO_RTNL   (1U << (TCA_ACT_FLAGS_USER_BITS + 3))
  70
  71 /* Update lastuse only if needed, to avoid dirtying a cache line.
  72  * We use a temp variable to avoid fetching jiffies twice.
  73  */
  74 static inline void tcf_lastuse_update(struct tcf_t *tm)
  75 {
  76         unsigned long now = jiffies;
  77
  78         if (tm->lastuse != now)
  79                 tm->lastuse = now;
  80         if (unlikely(!tm->firstuse))
  81                 tm->firstuse = now;
  82 }
  83
  84 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
  85 {
  86         dtm->install = jiffies_to_clock_t(jiffies - stm->install);
  87         dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
  88         dtm->firstuse = stm->firstuse ?
  89                 jiffies_to_clock_t(jiffies - stm->firstuse) : 0;
  90         dtm->expires = jiffies_to_clock_t(stm->expires);
  91 }
  92
  93 static inline enum flow_action_hw_stats tc_act_hw_stats(u8 hw_stats)
  94 {
  95         if (WARN_ON_ONCE(hw_stats > TCA_ACT_HW_STATS_ANY))
  96                 return FLOW_ACTION_HW_STATS_DONT_CARE;
  97         else if (!hw_stats)
  98                 return FLOW_ACTION_HW_STATS_DISABLED;
  99
 100         return hw_stats;
 101 }
 102
 103 #ifdef CONFIG_NET_CLS_ACT
 104
 105 #define ACT_P_CREATED 1
 106 #define ACT_P_DELETED 1
 107
 108 typedef void (*tc_action_priv_destructor)(void *priv);
 109
 110 struct tc_action_ops {
 111         struct list_head head;
 112         char    kind[IFNAMSIZ];
 113         enum tca_id  id; /* identifier should match kind */
 114         size_t  size;
 115         struct module           *owner;
 116         int     (*act)(struct sk_buff *, const struct tc_action *,
 117                        struct tcf_result *); /* called under RCU BH lock*/
 118         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
 119         void    (*cleanup)(struct tc_action *);
 120         int     (*lookup)(struct net *net, struct tc_action **a, u32 index);
 121         int     (*init)(struct net *net, struct nlattr *nla,
 122                         struct nlattr *est, struct tc_action **act,
 123                         struct tcf_proto *tp,
 124                         u32 flags, struct netlink_ext_ack *extack);
 125         int     (*walk)(struct net *, struct sk_buff *,
 126                         struct netlink_callback *, int,
 127                         const struct tc_action_ops *,
 128                         struct netlink_ext_ack *);
 129         void    (*stats_update)(struct tc_action *, u64, u64, u64, u64, bool);
 130         size_t  (*get_fill_size)(const struct tc_action *act);
 131         struct net_device *(*get_dev)(const struct tc_action *a,
 132                                       tc_action_priv_destructor *destructor);
 133         struct psample_group *
 134         (*get_psample_group)(const struct tc_action *a,
 135                              tc_action_priv_destructor *destructor);
 136         int     (*offload_act_setup)(struct tc_action *act, void *entry_data,
 137                                      u32 *index_inc, bool bind,
 138                                      struct netlink_ext_ack *extack);
 139 };
 140
 141 struct tc_action_net {
 142         struct tcf_idrinfo *idrinfo;
 143         const struct tc_action_ops *ops;
 144 };
 145
 146 static inline
 147 int tc_action_net_init(struct net *net, struct tc_action_net *tn,
 148                        const struct tc_action_ops *ops)
 149 {
 150         int err = 0;
 151
 152         tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
 153         if (!tn->idrinfo)
 154                 return -ENOMEM;
 155         tn->ops = ops;
 156         tn->idrinfo->net = net;
 157         mutex_init(&tn->idrinfo->lock);
 158         idr_init(&tn->idrinfo->action_idr);
 159         return err;
 160 }
 161
 162 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
 163                          struct tcf_idrinfo *idrinfo);
 164
 165 static inline void tc_action_net_exit(struct list_head *net_list,
 166                                       unsigned int id)
 167 {
 168         struct net *net;
 169
 170         rtnl_lock();
 171         list_for_each_entry(net, net_list, exit_list) {
 172                 struct tc_action_net *tn = net_generic(net, id);
 173
 174                 tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
 175                 kfree(tn->idrinfo);
 176         }
 177         rtnl_unlock();
 178 }
 179
 180 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
 181                        struct netlink_callback *cb, int type,
 182                        const struct tc_action_ops *ops,
 183                        struct netlink_ext_ack *extack);
 184 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
 185 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
 186                    struct tc_action **a, const struct tc_action_ops *ops,
 187                    int bind, bool cpustats, u32 flags);
 188 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
 189                               struct nlattr *est, struct tc_action **a,
 190                               const struct tc_action_ops *ops, int bind,
 191                               u32 flags);
 192 void tcf_idr_insert_many(struct tc_action *actions[]);
 193 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
 194 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
 195                         struct tc_action **a, int bind);
 196 int tcf_idr_release(struct tc_action *a, bool bind);
 197
 198 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
 199 int tcf_unregister_action(struct tc_action_ops *a,
 200                           struct pernet_operations *ops);
 201 int tcf_action_destroy(struct tc_action *actions[], int bind);
 202 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
 203                     int nr_actions, struct tcf_result *res);
 204 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
 205                     struct nlattr *est,
 206                     struct tc_action *actions[], int init_res[], size_t *attr_size,
 207                     u32 flags, u32 fl_flags, struct netlink_ext_ack *extack);
 208 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police,
 209                                          bool rtnl_held,
 210                                          struct netlink_ext_ack *extack);
 211 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 212                                     struct nlattr *nla, struct nlattr *est,
 213                                     struct tc_action_ops *a_o, int *init_res,
 214                                     u32 flags, struct netlink_ext_ack *extack);
 215 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
 216                     int ref, bool terse);
 217 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
 218 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
 219
 220 static inline void tcf_action_update_bstats(struct tc_action *a,
 221                                             struct sk_buff *skb)
 222 {
 223         if (likely(a->cpu_bstats)) {
 224                 bstats_update(this_cpu_ptr(a->cpu_bstats), skb);
 225                 return;
 226         }
 227         spin_lock(&a->tcfa_lock);
 228         bstats_update(&a->tcfa_bstats, skb);
 229         spin_unlock(&a->tcfa_lock);
 230 }
 231
 232 static inline void tcf_action_inc_drop_qstats(struct tc_action *a)
 233 {
 234         if (likely(a->cpu_qstats)) {
 235                 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats));
 236                 return;
 237         }
 238         spin_lock(&a->tcfa_lock);
 239         qstats_drop_inc(&a->tcfa_qstats);
 240         spin_unlock(&a->tcfa_lock);
 241 }
 242
 243 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a)
 244 {
 245         if (likely(a->cpu_qstats)) {
 246                 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats));
 247                 return;
 248         }
 249         spin_lock(&a->tcfa_lock);
 250         qstats_overlimit_inc(&a->tcfa_qstats);
 251         spin_unlock(&a->tcfa_lock);
 252 }
 253
 254 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
 255                              u64 drops, bool hw);
 256 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 257
 258 int tcf_action_update_hw_stats(struct tc_action *action);
 259 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
 260                             void *cb_priv, bool add);
 261 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
 262                              struct tcf_chain **handle,
 263                              struct netlink_ext_ack *newchain);
 264 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
 265                                          struct tcf_chain *newchain);
 266
 267 #ifdef CONFIG_INET
 268 DECLARE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
 269 #endif
 270
 271 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
 272
 273 #else /* !CONFIG_NET_CLS_ACT */
 274
 275 static inline int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
 276                                           void *cb_priv, bool add) {
 277         return 0;
 278 }
 279
 280 #endif /* CONFIG_NET_CLS_ACT */
 281
 282 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
 283                                            u64 packets, u64 drops,
 284                                            u64 lastuse, bool hw)
 285 {
 286 #ifdef CONFIG_NET_CLS_ACT
 287         if (!a->ops->stats_update)
 288                 return;
 289
 290         a->ops->stats_update(a, bytes, packets, drops, lastuse, hw);
 291 #endif
 292 }
 293
 294
 295 #endif