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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 <net/sch_generic.h>
 10 #include <net/pkt_sched.h>
 11 #include <net/net_namespace.h>
 12 #include <net/netns/generic.h>
 13 
 14 struct tcf_idrinfo {
 15         spinlock_t      lock;
 16         struct idr      action_idr;
 17 };
 18 
 19 struct tc_action_ops;
 20 
 21 struct tc_action {
 22         const struct tc_action_ops      *ops;
 23         __u32                           type; /* for backward compat(TCA_OLD_COMPAT) */
 24         __u32                           order;
 25         struct list_head                list;
 26         struct tcf_idrinfo              *idrinfo;
 27 
 28         u32                             tcfa_index;
 29         int                             tcfa_refcnt;
 30         int                             tcfa_bindcnt;
 31         u32                             tcfa_capab;
 32         int                             tcfa_action;
 33         struct tcf_t                    tcfa_tm;
 34         struct gnet_stats_basic_packed  tcfa_bstats;
 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_queue __percpu *cpu_qstats;
 40         struct tc_cookie        *act_cookie;
 41         struct tcf_chain        *goto_chain;
 42 };
 43 #define tcf_index       common.tcfa_index
 44 #define tcf_refcnt      common.tcfa_refcnt
 45 #define tcf_bindcnt     common.tcfa_bindcnt
 46 #define tcf_capab       common.tcfa_capab
 47 #define tcf_action      common.tcfa_action
 48 #define tcf_tm          common.tcfa_tm
 49 #define tcf_bstats      common.tcfa_bstats
 50 #define tcf_qstats      common.tcfa_qstats
 51 #define tcf_rate_est    common.tcfa_rate_est
 52 #define tcf_lock        common.tcfa_lock
 53 
 54 /* Update lastuse only if needed, to avoid dirtying a cache line.
 55  * We use a temp variable to avoid fetching jiffies twice.
 56  */
 57 static inline void tcf_lastuse_update(struct tcf_t *tm)
 58 {
 59         unsigned long now = jiffies;
 60 
 61         if (tm->lastuse != now)
 62                 tm->lastuse = now;
 63         if (unlikely(!tm->firstuse))
 64                 tm->firstuse = now;
 65 }
 66 
 67 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
 68 {
 69         dtm->install = jiffies_to_clock_t(jiffies - stm->install);
 70         dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
 71         dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
 72         dtm->expires = jiffies_to_clock_t(stm->expires);
 73 }
 74 
 75 #ifdef CONFIG_NET_CLS_ACT
 76 
 77 #define ACT_P_CREATED 1
 78 #define ACT_P_DELETED 1
 79 
 80 struct tc_action_ops {
 81         struct list_head head;
 82         char    kind[IFNAMSIZ];
 83         __u32   type; /* TBD to match kind */
 84         size_t  size;
 85         struct module           *owner;
 86         int     (*act)(struct sk_buff *, const struct tc_action *,
 87                        struct tcf_result *);
 88         int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
 89         void    (*cleanup)(struct tc_action *);
 90         int     (*lookup)(struct net *net, struct tc_action **a, u32 index,
 91                           struct netlink_ext_ack *extack);
 92         int     (*init)(struct net *net, struct nlattr *nla,
 93                         struct nlattr *est, struct tc_action **act, int ovr,
 94                         int bind, struct netlink_ext_ack *extack);
 95         int     (*walk)(struct net *, struct sk_buff *,
 96                         struct netlink_callback *, int,
 97                         const struct tc_action_ops *,
 98                         struct netlink_ext_ack *);
 99         void    (*stats_update)(struct tc_action *, u64, u32, u64);
100         size_t  (*get_fill_size)(const struct tc_action *act);
101         struct net_device *(*get_dev)(const struct tc_action *a);
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 bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
148                     int bind);
149 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
150                    struct tc_action **a, const struct tc_action_ops *ops,
151                    int bind, bool cpustats);
152 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
153 
154 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
155 
156 static inline int tcf_idr_release(struct tc_action *a, bool bind)
157 {
158         return __tcf_idr_release(a, bind, false);
159 }
160 
161 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
162 int tcf_unregister_action(struct tc_action_ops *a,
163                           struct pernet_operations *ops);
164 int tcf_action_destroy(struct list_head *actions, int bind);
165 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
166                     int nr_actions, struct tcf_result *res);
167 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
168                     struct nlattr *est, char *name, int ovr, int bind,
169                     struct list_head *actions, size_t *attr_size,
170                     struct netlink_ext_ack *extack);
171 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
172                                     struct nlattr *nla, struct nlattr *est,
173                                     char *name, int ovr, int bind,
174                                     struct netlink_ext_ack *extack);
175 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
176 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
177 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
178 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
179 
180 #endif /* CONFIG_NET_CLS_ACT */
181 
182 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
183                                            u64 packets, u64 lastuse)
184 {
185 #ifdef CONFIG_NET_CLS_ACT
186         if (!a->ops->stats_update)
187                 return;
188 
189         a->ops->stats_update(a, bytes, packets, lastuse);
190 #endif
191 }
192 
193 typedef int tc_setup_cb_t(enum tc_setup_type type,
194                           void *type_data, void *cb_priv);
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
228 

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