Linux kernel mirror (for testing)
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linux
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 struct mutex lock;
17 struct idr action_idr;
18 struct net *net;
19};
20
21struct tc_action_ops;
22
23struct 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 */
64static 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
74static 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 = jiffies_to_clock_t(jiffies - stm->firstuse);
79 dtm->expires = jiffies_to_clock_t(stm->expires);
80}
81
82#ifdef CONFIG_NET_CLS_ACT
83
84#define ACT_P_CREATED 1
85#define ACT_P_DELETED 1
86
87typedef void (*tc_action_priv_destructor)(void *priv);
88
89struct tc_action_ops {
90 struct list_head head;
91 char kind[IFNAMSIZ];
92 enum tca_id id; /* identifier should match kind */
93 size_t size;
94 struct module *owner;
95 int (*act)(struct sk_buff *, const struct tc_action *,
96 struct tcf_result *); /* called under RCU BH lock*/
97 int (*dump)(struct sk_buff *, struct tc_action *, int, int);
98 void (*cleanup)(struct tc_action *);
99 int (*lookup)(struct net *net, struct tc_action **a, u32 index);
100 int (*init)(struct net *net, struct nlattr *nla,
101 struct nlattr *est, struct tc_action **act, int ovr,
102 int bind, bool rtnl_held, struct tcf_proto *tp,
103 u32 flags, struct netlink_ext_ack *extack);
104 int (*walk)(struct net *, struct sk_buff *,
105 struct netlink_callback *, int,
106 const struct tc_action_ops *,
107 struct netlink_ext_ack *);
108 void (*stats_update)(struct tc_action *, u64, u32, u64, bool);
109 size_t (*get_fill_size)(const struct tc_action *act);
110 struct net_device *(*get_dev)(const struct tc_action *a,
111 tc_action_priv_destructor *destructor);
112 struct psample_group *
113 (*get_psample_group)(const struct tc_action *a,
114 tc_action_priv_destructor *destructor);
115};
116
117struct tc_action_net {
118 struct tcf_idrinfo *idrinfo;
119 const struct tc_action_ops *ops;
120};
121
122static inline
123int tc_action_net_init(struct net *net, struct tc_action_net *tn,
124 const struct tc_action_ops *ops)
125{
126 int err = 0;
127
128 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
129 if (!tn->idrinfo)
130 return -ENOMEM;
131 tn->ops = ops;
132 tn->idrinfo->net = net;
133 mutex_init(&tn->idrinfo->lock);
134 idr_init(&tn->idrinfo->action_idr);
135 return err;
136}
137
138void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
139 struct tcf_idrinfo *idrinfo);
140
141static inline void tc_action_net_exit(struct list_head *net_list,
142 unsigned int id)
143{
144 struct net *net;
145
146 rtnl_lock();
147 list_for_each_entry(net, net_list, exit_list) {
148 struct tc_action_net *tn = net_generic(net, id);
149
150 tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
151 kfree(tn->idrinfo);
152 }
153 rtnl_unlock();
154}
155
156int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
157 struct netlink_callback *cb, int type,
158 const struct tc_action_ops *ops,
159 struct netlink_ext_ack *extack);
160int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
161int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
162 struct tc_action **a, const struct tc_action_ops *ops,
163 int bind, bool cpustats, u32 flags);
164int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
165 struct nlattr *est, struct tc_action **a,
166 const struct tc_action_ops *ops, int bind,
167 u32 flags);
168void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
169
170void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
171int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
172 struct tc_action **a, int bind);
173int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
174
175static inline int tcf_idr_release(struct tc_action *a, bool bind)
176{
177 return __tcf_idr_release(a, bind, false);
178}
179
180int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
181int tcf_unregister_action(struct tc_action_ops *a,
182 struct pernet_operations *ops);
183int tcf_action_destroy(struct tc_action *actions[], int bind);
184int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
185 int nr_actions, struct tcf_result *res);
186int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
187 struct nlattr *est, char *name, int ovr, int bind,
188 struct tc_action *actions[], size_t *attr_size,
189 bool rtnl_held, struct netlink_ext_ack *extack);
190struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
191 struct nlattr *nla, struct nlattr *est,
192 char *name, int ovr, int bind,
193 bool rtnl_held,
194 struct netlink_ext_ack *extack);
195int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
196 int ref);
197int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
198int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
199
200static inline void tcf_action_update_bstats(struct tc_action *a,
201 struct sk_buff *skb)
202{
203 if (likely(a->cpu_bstats)) {
204 bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), skb);
205 return;
206 }
207 spin_lock(&a->tcfa_lock);
208 bstats_update(&a->tcfa_bstats, skb);
209 spin_unlock(&a->tcfa_lock);
210}
211
212static inline void tcf_action_inc_drop_qstats(struct tc_action *a)
213{
214 if (likely(a->cpu_qstats)) {
215 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats));
216 return;
217 }
218 spin_lock(&a->tcfa_lock);
219 qstats_drop_inc(&a->tcfa_qstats);
220 spin_unlock(&a->tcfa_lock);
221}
222
223static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a)
224{
225 if (likely(a->cpu_qstats)) {
226 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats));
227 return;
228 }
229 spin_lock(&a->tcfa_lock);
230 qstats_overlimit_inc(&a->tcfa_qstats);
231 spin_unlock(&a->tcfa_lock);
232}
233
234void tcf_action_update_stats(struct tc_action *a, u64 bytes, u32 packets,
235 bool drop, bool hw);
236int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
237
238int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
239 struct tcf_chain **handle,
240 struct netlink_ext_ack *newchain);
241struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
242 struct tcf_chain *newchain);
243#endif /* CONFIG_NET_CLS_ACT */
244
245static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
246 u64 packets, 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, lastuse, hw);
253#endif
254}
255
256
257#endif