Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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 __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_basic_packed tcfa_bstats_hw;
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_basic_cpu __percpu *cpu_bstats_hw;
41 struct gnet_stats_queue __percpu *cpu_qstats;
42 struct tc_cookie __rcu *act_cookie;
43 struct tcf_chain __rcu *goto_chain;
44};
45#define tcf_index common.tcfa_index
46#define tcf_refcnt common.tcfa_refcnt
47#define tcf_bindcnt common.tcfa_bindcnt
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 enum tca_id id; /* identifier should 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 int (*init)(struct net *net, struct nlattr *nla,
93 struct nlattr *est, struct tc_action **act, int ovr,
94 int bind, bool rtnl_held, struct tcf_proto *tp,
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, bool);
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
106struct tc_action_net {
107 struct tcf_idrinfo *idrinfo;
108 const struct tc_action_ops *ops;
109};
110
111static inline
112int 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 mutex_init(&tn->idrinfo->lock);
123 idr_init(&tn->idrinfo->action_idr);
124 return err;
125}
126
127void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
128 struct tcf_idrinfo *idrinfo);
129
130static 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
145int 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);
149int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
150int 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);
153void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
154
155void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
156int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
157 struct tc_action **a, int bind);
158int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
159
160static inline int tcf_idr_release(struct tc_action *a, bool bind)
161{
162 return __tcf_idr_release(a, bind, false);
163}
164
165int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
166int tcf_unregister_action(struct tc_action_ops *a,
167 struct pernet_operations *ops);
168int tcf_action_destroy(struct tc_action *actions[], int bind);
169int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
170 int nr_actions, struct tcf_result *res);
171int 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);
175struct 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);
180int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
181 int ref);
182int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
183int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
184int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
185
186int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
187 struct tcf_chain **handle,
188 struct netlink_ext_ack *newchain);
189struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
190 struct tcf_chain *newchain);
191#endif /* CONFIG_NET_CLS_ACT */
192
193static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
194 u64 packets, u64 lastuse, bool hw)
195{
196#ifdef CONFIG_NET_CLS_ACT
197 if (!a->ops->stats_update)
198 return;
199
200 a->ops->stats_update(a, bytes, packets, lastuse, hw);
201#endif
202}
203
204
205#endif