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TOMOYO Linux Cross Reference
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         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 #endif /* CONFIG_NET_CLS_ACT */
243 
244 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
245                                            u64 packets, u64 drops,
246                                            u64 lastuse, bool hw)
247 {
248 #ifdef CONFIG_NET_CLS_ACT
249         if (!a->ops->stats_update)
250                 return;
251 
252         a->ops->stats_update(a, bytes, packets, drops, lastuse, hw);
253 #endif
254 }
255 
256 
257 #endif
258 

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