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Linux/include/net/act_api.h

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  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 };
 45 #define tcf_index       common.tcfa_index
 46 #define tcf_refcnt      common.tcfa_refcnt
 47 #define tcf_bindcnt     common.tcfa_bindcnt
 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 typedef void (*tc_action_priv_destructor)(void *priv);
 82 
 83 struct tc_action_ops {
 84         struct list_head head;
 85         char    kind[IFNAMSIZ];
 86         enum tca_id  id; /* identifier should match kind */
 87         size_t  size;
 88         struct module           *owner;
 89         int     (*act)(struct sk_buff *, const struct tc_action *,
 90                        struct tcf_result *); /* called under RCU BH lock*/
 91         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
 92         void    (*cleanup)(struct tc_action *);
 93         int     (*lookup)(struct net *net, struct tc_action **a, u32 index);
 94         int     (*init)(struct net *net, struct nlattr *nla,
 95                         struct nlattr *est, struct tc_action **act, int ovr,
 96                         int bind, bool rtnl_held, struct tcf_proto *tp,
 97                         u32 flags, struct netlink_ext_ack *extack);
 98         int     (*walk)(struct net *, struct sk_buff *,
 99                         struct netlink_callback *, int,
100                         const struct tc_action_ops *,
101                         struct netlink_ext_ack *);
102         void    (*stats_update)(struct tc_action *, u64, u32, u64, bool);
103         size_t  (*get_fill_size)(const struct tc_action *act);
104         struct net_device *(*get_dev)(const struct tc_action *a,
105                                       tc_action_priv_destructor *destructor);
106         struct psample_group *
107         (*get_psample_group)(const struct tc_action *a,
108                              tc_action_priv_destructor *destructor);
109 };
110 
111 struct tc_action_net {
112         struct tcf_idrinfo *idrinfo;
113         const struct tc_action_ops *ops;
114 };
115 
116 static inline
117 int tc_action_net_init(struct net *net, struct tc_action_net *tn,
118                        const struct tc_action_ops *ops)
119 {
120         int err = 0;
121 
122         tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
123         if (!tn->idrinfo)
124                 return -ENOMEM;
125         tn->ops = ops;
126         tn->idrinfo->net = net;
127         mutex_init(&tn->idrinfo->lock);
128         idr_init(&tn->idrinfo->action_idr);
129         return err;
130 }
131 
132 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
133                          struct tcf_idrinfo *idrinfo);
134 
135 static inline void tc_action_net_exit(struct list_head *net_list,
136                                       unsigned int id)
137 {
138         struct net *net;
139 
140         rtnl_lock();
141         list_for_each_entry(net, net_list, exit_list) {
142                 struct tc_action_net *tn = net_generic(net, id);
143 
144                 tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
145                 kfree(tn->idrinfo);
146         }
147         rtnl_unlock();
148 }
149 
150 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
151                        struct netlink_callback *cb, int type,
152                        const struct tc_action_ops *ops,
153                        struct netlink_ext_ack *extack);
154 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
155 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
156                    struct tc_action **a, const struct tc_action_ops *ops,
157                    int bind, bool cpustats, u32 flags);
158 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
159                               struct nlattr *est, struct tc_action **a,
160                               const struct tc_action_ops *ops, int bind,
161                               u32 flags);
162 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
163 
164 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
165 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
166                         struct tc_action **a, int bind);
167 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
168 
169 static inline int tcf_idr_release(struct tc_action *a, bool bind)
170 {
171         return __tcf_idr_release(a, bind, false);
172 }
173 
174 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
175 int tcf_unregister_action(struct tc_action_ops *a,
176                           struct pernet_operations *ops);
177 int tcf_action_destroy(struct tc_action *actions[], int bind);
178 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
179                     int nr_actions, struct tcf_result *res);
180 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
181                     struct nlattr *est, char *name, int ovr, int bind,
182                     struct tc_action *actions[], size_t *attr_size,
183                     bool rtnl_held, struct netlink_ext_ack *extack);
184 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
185                                     struct nlattr *nla, struct nlattr *est,
186                                     char *name, int ovr, int bind,
187                                     bool rtnl_held,
188                                     struct netlink_ext_ack *extack);
189 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
190                     int ref);
191 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
192 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
193 
194 static inline void tcf_action_update_bstats(struct tc_action *a,
195                                             struct sk_buff *skb)
196 {
197         if (likely(a->cpu_bstats)) {
198                 bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), skb);
199                 return;
200         }
201         spin_lock(&a->tcfa_lock);
202         bstats_update(&a->tcfa_bstats, skb);
203         spin_unlock(&a->tcfa_lock);
204 }
205 
206 static inline void tcf_action_inc_drop_qstats(struct tc_action *a)
207 {
208         if (likely(a->cpu_qstats)) {
209                 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats));
210                 return;
211         }
212         spin_lock(&a->tcfa_lock);
213         qstats_drop_inc(&a->tcfa_qstats);
214         spin_unlock(&a->tcfa_lock);
215 }
216 
217 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a)
218 {
219         if (likely(a->cpu_qstats)) {
220                 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats));
221                 return;
222         }
223         spin_lock(&a->tcfa_lock);
224         qstats_overlimit_inc(&a->tcfa_qstats);
225         spin_unlock(&a->tcfa_lock);
226 }
227 
228 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u32 packets,
229                              bool drop, bool hw);
230 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
231 
232 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
233                              struct tcf_chain **handle,
234                              struct netlink_ext_ack *newchain);
235 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
236                                          struct tcf_chain *newchain);
237 #endif /* CONFIG_NET_CLS_ACT */
238 
239 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
240                                            u64 packets, u64 lastuse, bool hw)
241 {
242 #ifdef CONFIG_NET_CLS_ACT
243         if (!a->ops->stats_update)
244                 return;
245 
246         a->ops->stats_update(a, bytes, packets, lastuse, hw);
247 #endif
248 }
249 
250 
251 #endif
252 

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