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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
15struct tcf_idrinfo {
16 spinlock_t lock;
17 struct idr action_idr;
18};
19
20struct tc_action_ops;
21
22struct tc_action {
23 const struct tc_action_ops *ops;
24 __u32 type; /* for backward compat(TCA_OLD_COMPAT) */
25 __u32 order;
26 struct list_head list;
27 struct tcf_idrinfo *idrinfo;
28
29 u32 tcfa_index;
30 refcount_t tcfa_refcnt;
31 atomic_t tcfa_bindcnt;
32 u32 tcfa_capab;
33 int tcfa_action;
34 struct tcf_t tcfa_tm;
35 struct gnet_stats_basic_packed tcfa_bstats;
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_cpu __percpu *cpu_bstats;
40 struct gnet_stats_queue __percpu *cpu_qstats;
41 struct tc_cookie __rcu *act_cookie;
42 struct tcf_chain *goto_chain;
43};
44#define tcf_index common.tcfa_index
45#define tcf_refcnt common.tcfa_refcnt
46#define tcf_bindcnt common.tcfa_bindcnt
47#define tcf_capab common.tcfa_capab
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 */
58static 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
68static 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
81struct tc_action_ops {
82 struct list_head head;
83 char kind[IFNAMSIZ];
84 __u32 type; /* TBD to match kind */
85 size_t size;
86 struct module *owner;
87 int (*act)(struct sk_buff *, const struct tc_action *,
88 struct tcf_result *); /* called under RCU BH lock*/
89 int (*dump)(struct sk_buff *, struct tc_action *, int, int);
90 void (*cleanup)(struct tc_action *);
91 int (*lookup)(struct net *net, struct tc_action **a, u32 index,
92 struct netlink_ext_ack *extack);
93 int (*init)(struct net *net, struct nlattr *nla,
94 struct nlattr *est, struct tc_action **act, int ovr,
95 int bind, bool rtnl_held,
96 struct netlink_ext_ack *extack);
97 int (*walk)(struct net *, struct sk_buff *,
98 struct netlink_callback *, int,
99 const struct tc_action_ops *,
100 struct netlink_ext_ack *);
101 void (*stats_update)(struct tc_action *, u64, u32, u64);
102 size_t (*get_fill_size)(const struct tc_action *act);
103 struct net_device *(*get_dev)(const struct tc_action *a);
104 void (*put_dev)(struct net_device *dev);
105 int (*delete)(struct net *net, u32 index);
106};
107
108struct tc_action_net {
109 struct tcf_idrinfo *idrinfo;
110 const struct tc_action_ops *ops;
111};
112
113static inline
114int tc_action_net_init(struct tc_action_net *tn,
115 const struct tc_action_ops *ops)
116{
117 int err = 0;
118
119 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
120 if (!tn->idrinfo)
121 return -ENOMEM;
122 tn->ops = ops;
123 spin_lock_init(&tn->idrinfo->lock);
124 idr_init(&tn->idrinfo->action_idr);
125 return err;
126}
127
128void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
129 struct tcf_idrinfo *idrinfo);
130
131static inline void tc_action_net_exit(struct list_head *net_list,
132 unsigned int id)
133{
134 struct net *net;
135
136 rtnl_lock();
137 list_for_each_entry(net, net_list, exit_list) {
138 struct tc_action_net *tn = net_generic(net, id);
139
140 tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
141 kfree(tn->idrinfo);
142 }
143 rtnl_unlock();
144}
145
146int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
147 struct netlink_callback *cb, int type,
148 const struct tc_action_ops *ops,
149 struct netlink_ext_ack *extack);
150int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
151bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
152 int bind);
153int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
154 struct tc_action **a, const struct tc_action_ops *ops,
155 int bind, bool cpustats);
156void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
157
158void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
159int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
160 struct tc_action **a, int bind);
161int tcf_idr_delete_index(struct tc_action_net *tn, u32 index);
162int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
163
164static inline int tcf_idr_release(struct tc_action *a, bool bind)
165{
166 return __tcf_idr_release(a, bind, false);
167}
168
169int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
170int tcf_unregister_action(struct tc_action_ops *a,
171 struct pernet_operations *ops);
172int tcf_action_destroy(struct tc_action *actions[], int bind);
173int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
174 int nr_actions, struct tcf_result *res);
175int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
176 struct nlattr *est, char *name, int ovr, int bind,
177 struct tc_action *actions[], size_t *attr_size,
178 bool rtnl_held, struct netlink_ext_ack *extack);
179struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
180 struct nlattr *nla, struct nlattr *est,
181 char *name, int ovr, int bind,
182 bool rtnl_held,
183 struct netlink_ext_ack *extack);
184int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
185 int ref);
186int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
187int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
188int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
189
190#endif /* CONFIG_NET_CLS_ACT */
191
192static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
193 u64 packets, u64 lastuse)
194{
195#ifdef CONFIG_NET_CLS_ACT
196 if (!a->ops->stats_update)
197 return;
198
199 a->ops->stats_update(a, bytes, packets, lastuse);
200#endif
201}
202
203#ifdef CONFIG_NET_CLS_ACT
204int tc_setup_cb_egdev_register(const struct net_device *dev,
205 tc_setup_cb_t *cb, void *cb_priv);
206void tc_setup_cb_egdev_unregister(const struct net_device *dev,
207 tc_setup_cb_t *cb, void *cb_priv);
208int tc_setup_cb_egdev_call(const struct net_device *dev,
209 enum tc_setup_type type, void *type_data,
210 bool err_stop);
211#else
212static inline
213int tc_setup_cb_egdev_register(const struct net_device *dev,
214 tc_setup_cb_t *cb, void *cb_priv)
215{
216 return 0;
217}
218
219static inline
220void tc_setup_cb_egdev_unregister(const struct net_device *dev,
221 tc_setup_cb_t *cb, void *cb_priv)
222{
223}
224
225static inline
226int tc_setup_cb_egdev_call(const struct net_device *dev,
227 enum tc_setup_type type, void *type_data,
228 bool err_stop)
229{
230 return 0;
231}
232#endif
233
234#endif