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 spinlock_t 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 __u32 order;
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_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 __rcu *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_action common.tcfa_action
47 #define tcf_tm common.tcfa_tm
48 #define tcf_bstats common.tcfa_bstats
49 #define tcf_qstats common.tcfa_qstats
50 #define tcf_rate_est common.tcfa_rate_est
51 #define tcf_lock common.tcfa_lock
52
53 /* Update lastuse only if needed, to avoid dirtying a cache line.
54 * We use a temp variable to avoid fetching jiffies twice.
55 */
tcf_lastuse_update(struct tcf_t * tm)56 static inline void tcf_lastuse_update(struct tcf_t *tm)
57 {
58 unsigned long now = jiffies;
59
60 if (tm->lastuse != now)
61 tm->lastuse = now;
62 if (unlikely(!tm->firstuse))
63 tm->firstuse = now;
64 }
65
tcf_tm_dump(struct tcf_t * dtm,const struct tcf_t * stm)66 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
67 {
68 dtm->install = jiffies_to_clock_t(jiffies - stm->install);
69 dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
70 dtm->firstuse = stm->firstuse ?
71 jiffies_to_clock_t(jiffies - stm->firstuse) : 0;
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 *); /* called under RCU BH lock*/
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, bool rtnl_held,
95 struct netlink_ext_ack *extack);
96 int (*walk)(struct net *, struct sk_buff *,
97 struct netlink_callback *, int,
98 const struct tc_action_ops *,
99 struct netlink_ext_ack *);
100 void (*stats_update)(struct tc_action *, u64, u32, u64);
101 size_t (*get_fill_size)(const struct tc_action *act);
102 struct net_device *(*get_dev)(const struct tc_action *a);
103 void (*put_dev)(struct net_device *dev);
104 };
105
106 struct tc_action_net {
107 struct tcf_idrinfo *idrinfo;
108 const struct tc_action_ops *ops;
109 };
110
111 static inline
tc_action_net_init(struct net * net,struct tc_action_net * tn,const struct tc_action_ops * ops)112 int tc_action_net_init(struct net *net, struct tc_action_net *tn,
113 const struct tc_action_ops *ops)
114 {
115 int err = 0;
116
117 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
118 if (!tn->idrinfo)
119 return -ENOMEM;
120 tn->ops = ops;
121 tn->idrinfo->net = net;
122 spin_lock_init(&tn->idrinfo->lock);
123 idr_init(&tn->idrinfo->action_idr);
124 return err;
125 }
126
127 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
128 struct tcf_idrinfo *idrinfo);
129
tc_action_net_exit(struct list_head * net_list,unsigned int id)130 static inline void tc_action_net_exit(struct list_head *net_list,
131 unsigned int id)
132 {
133 struct net *net;
134
135 rtnl_lock();
136 list_for_each_entry(net, net_list, exit_list) {
137 struct tc_action_net *tn = net_generic(net, id);
138
139 tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
140 kfree(tn->idrinfo);
141 }
142 rtnl_unlock();
143 }
144
145 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
146 struct netlink_callback *cb, int type,
147 const struct tc_action_ops *ops,
148 struct netlink_ext_ack *extack);
149 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
150 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
151 struct tc_action **a, const struct tc_action_ops *ops,
152 int bind, bool cpustats);
153 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
154
155 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
156 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
157 struct tc_action **a, int bind);
158 int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
159
tcf_idr_release(struct tc_action * a,bool bind)160 static inline int tcf_idr_release(struct tc_action *a, bool bind)
161 {
162 return __tcf_idr_release(a, bind, false);
163 }
164
165 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
166 int tcf_unregister_action(struct tc_action_ops *a,
167 struct pernet_operations *ops);
168 int tcf_action_destroy(struct tc_action *actions[], int bind);
169 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
170 int nr_actions, struct tcf_result *res);
171 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
172 struct nlattr *est, char *name, int ovr, int bind,
173 struct tc_action *actions[], size_t *attr_size,
174 bool rtnl_held, struct netlink_ext_ack *extack);
175 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
176 struct nlattr *nla, struct nlattr *est,
177 char *name, int ovr, int bind,
178 bool rtnl_held,
179 struct netlink_ext_ack *extack);
180 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
181 int ref);
182 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
183 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
184 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
185
186 #endif /* CONFIG_NET_CLS_ACT */
187
tcf_action_stats_update(struct tc_action * a,u64 bytes,u64 packets,u64 lastuse)188 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
189 u64 packets, u64 lastuse)
190 {
191 #ifdef CONFIG_NET_CLS_ACT
192 if (!a->ops->stats_update)
193 return;
194
195 a->ops->stats_update(a, bytes, packets, lastuse);
196 #endif
197 }
198
199 #ifdef CONFIG_NET_CLS_ACT
200 int tc_setup_cb_egdev_register(const struct net_device *dev,
201 tc_setup_cb_t *cb, void *cb_priv);
202 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
203 tc_setup_cb_t *cb, void *cb_priv);
204 int tc_setup_cb_egdev_call(const struct net_device *dev,
205 enum tc_setup_type type, void *type_data,
206 bool err_stop);
207 #else
208 static inline
tc_setup_cb_egdev_register(const struct net_device * dev,tc_setup_cb_t * cb,void * cb_priv)209 int tc_setup_cb_egdev_register(const struct net_device *dev,
210 tc_setup_cb_t *cb, void *cb_priv)
211 {
212 return 0;
213 }
214
215 static inline
tc_setup_cb_egdev_unregister(const struct net_device * dev,tc_setup_cb_t * cb,void * cb_priv)216 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
217 tc_setup_cb_t *cb, void *cb_priv)
218 {
219 }
220
221 static inline
tc_setup_cb_egdev_call(const struct net_device * dev,enum tc_setup_type type,void * type_data,bool err_stop)222 int tc_setup_cb_egdev_call(const struct net_device *dev,
223 enum tc_setup_type type, void *type_data,
224 bool err_stop)
225 {
226 return 0;
227 }
228 #endif
229
230 #endif
231