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};
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 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 *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_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 */
57static 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
67static 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
80struct tc_action_ops {
81 struct list_head head;
82 char kind[IFNAMSIZ];
83 enum tca_id id; /* identifier should 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 int (*init)(struct net *net, struct nlattr *nla,
92 struct nlattr *est, struct tc_action **act, int ovr,
93 int bind, bool rtnl_held,
94 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, bool);
100 size_t (*get_fill_size)(const struct tc_action *act);
101 struct net_device *(*get_dev)(const struct tc_action *a);
102 void (*put_dev)(struct net_device *dev);
103};
104
105struct tc_action_net {
106 struct tcf_idrinfo *idrinfo;
107 const struct tc_action_ops *ops;
108};
109
110static inline
111int tc_action_net_init(struct tc_action_net *tn,
112 const struct tc_action_ops *ops)
113{
114 int err = 0;
115
116 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
117 if (!tn->idrinfo)
118 return -ENOMEM;
119 tn->ops = ops;
120 mutex_init(&tn->idrinfo->lock);
121 idr_init(&tn->idrinfo->action_idr);
122 return err;
123}
124
125void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
126 struct tcf_idrinfo *idrinfo);
127
128static inline void tc_action_net_exit(struct list_head *net_list,
129 unsigned int id)
130{
131 struct net *net;
132
133 rtnl_lock();
134 list_for_each_entry(net, net_list, exit_list) {
135 struct tc_action_net *tn = net_generic(net, id);
136
137 tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
138 kfree(tn->idrinfo);
139 }
140 rtnl_unlock();
141}
142
143int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
144 struct netlink_callback *cb, int type,
145 const struct tc_action_ops *ops,
146 struct netlink_ext_ack *extack);
147int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
148int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
149 struct tc_action **a, const struct tc_action_ops *ops,
150 int bind, bool cpustats);
151void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
152
153void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
154int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
155 struct tc_action **a, int bind);
156int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
157
158static inline int tcf_idr_release(struct tc_action *a, bool bind)
159{
160 return __tcf_idr_release(a, bind, false);
161}
162
163int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
164int tcf_unregister_action(struct tc_action_ops *a,
165 struct pernet_operations *ops);
166int tcf_action_destroy(struct tc_action *actions[], int bind);
167int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
168 int nr_actions, struct tcf_result *res);
169int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
170 struct nlattr *est, char *name, int ovr, int bind,
171 struct tc_action *actions[], size_t *attr_size,
172 bool rtnl_held, struct netlink_ext_ack *extack);
173struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
174 struct nlattr *nla, struct nlattr *est,
175 char *name, int ovr, int bind,
176 bool rtnl_held,
177 struct netlink_ext_ack *extack);
178int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
179 int ref);
180int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
181int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
182int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
183
184#endif /* CONFIG_NET_CLS_ACT */
185
186static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
187 u64 packets, u64 lastuse, bool hw)
188{
189#ifdef CONFIG_NET_CLS_ACT
190 if (!a->ops->stats_update)
191 return;
192
193 a->ops->stats_update(a, bytes, packets, lastuse, hw);
194#endif
195}
196
197
198#endif
199