Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1#ifndef __NET_ACT_API_H
2#define __NET_ACT_API_H
3
4/*
5 * Public police action API for classifiers/qdiscs
6 */
7
8#include <net/sch_generic.h>
9#include <net/pkt_sched.h>
10#include <net/net_namespace.h>
11#include <net/netns/generic.h>
12
13struct tcf_common {
14 struct hlist_node tcfc_head;
15 u32 tcfc_index;
16 int tcfc_refcnt;
17 int tcfc_bindcnt;
18 u32 tcfc_capab;
19 int tcfc_action;
20 struct tcf_t tcfc_tm;
21 struct gnet_stats_basic_packed tcfc_bstats;
22 struct gnet_stats_queue tcfc_qstats;
23 struct gnet_stats_rate_est64 tcfc_rate_est;
24 spinlock_t tcfc_lock;
25 struct rcu_head tcfc_rcu;
26 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
27 struct gnet_stats_queue __percpu *cpu_qstats;
28};
29#define tcf_head common.tcfc_head
30#define tcf_index common.tcfc_index
31#define tcf_refcnt common.tcfc_refcnt
32#define tcf_bindcnt common.tcfc_bindcnt
33#define tcf_capab common.tcfc_capab
34#define tcf_action common.tcfc_action
35#define tcf_tm common.tcfc_tm
36#define tcf_bstats common.tcfc_bstats
37#define tcf_qstats common.tcfc_qstats
38#define tcf_rate_est common.tcfc_rate_est
39#define tcf_lock common.tcfc_lock
40#define tcf_rcu common.tcfc_rcu
41
42struct tcf_hashinfo {
43 struct hlist_head *htab;
44 unsigned int hmask;
45 spinlock_t lock;
46 u32 index;
47};
48
49static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
50{
51 return index & hmask;
52}
53
54static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
55{
56 int i;
57
58 spin_lock_init(&hf->lock);
59 hf->index = 0;
60 hf->hmask = mask;
61 hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
62 GFP_KERNEL);
63 if (!hf->htab)
64 return -ENOMEM;
65 for (i = 0; i < mask + 1; i++)
66 INIT_HLIST_HEAD(&hf->htab[i]);
67 return 0;
68}
69
70/* Update lastuse only if needed, to avoid dirtying a cache line.
71 * We use a temp variable to avoid fetching jiffies twice.
72 */
73static inline void tcf_lastuse_update(struct tcf_t *tm)
74{
75 unsigned long now = jiffies;
76
77 if (tm->lastuse != now)
78 tm->lastuse = now;
79}
80
81struct tc_action {
82 void *priv;
83 const struct tc_action_ops *ops;
84 __u32 type; /* for backward compat(TCA_OLD_COMPAT) */
85 __u32 order;
86 struct list_head list;
87 struct tcf_hashinfo *hinfo;
88};
89
90#ifdef CONFIG_NET_CLS_ACT
91
92#define ACT_P_CREATED 1
93#define ACT_P_DELETED 1
94
95struct tc_action_ops {
96 struct list_head head;
97 char kind[IFNAMSIZ];
98 __u32 type; /* TBD to match kind */
99 struct module *owner;
100 int (*act)(struct sk_buff *, const struct tc_action *, struct tcf_result *);
101 int (*dump)(struct sk_buff *, struct tc_action *, int, int);
102 void (*cleanup)(struct tc_action *, int bind);
103 int (*lookup)(struct net *, struct tc_action *, u32);
104 int (*init)(struct net *net, struct nlattr *nla,
105 struct nlattr *est, struct tc_action *act, int ovr,
106 int bind);
107 int (*walk)(struct net *, struct sk_buff *,
108 struct netlink_callback *, int, struct tc_action *);
109 void (*stats_update)(struct tc_action *, u64, u32, u64);
110};
111
112struct tc_action_net {
113 struct tcf_hashinfo *hinfo;
114 const struct tc_action_ops *ops;
115};
116
117static inline
118int tc_action_net_init(struct tc_action_net *tn, const struct tc_action_ops *ops,
119 unsigned int mask)
120{
121 int err = 0;
122
123 tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL);
124 if (!tn->hinfo)
125 return -ENOMEM;
126 tn->ops = ops;
127 err = tcf_hashinfo_init(tn->hinfo, mask);
128 if (err)
129 kfree(tn->hinfo);
130 return err;
131}
132
133void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
134 struct tcf_hashinfo *hinfo);
135
136static inline void tc_action_net_exit(struct tc_action_net *tn)
137{
138 tcf_hashinfo_destroy(tn->ops, tn->hinfo);
139 kfree(tn->hinfo);
140}
141
142int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
143 struct netlink_callback *cb, int type,
144 struct tc_action *a);
145int tcf_hash_search(struct tc_action_net *tn, struct tc_action *a, u32 index);
146u32 tcf_hash_new_index(struct tc_action_net *tn);
147int tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action *a,
148 int bind);
149int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
150 struct tc_action *a, int size, int bind, bool cpustats);
151void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
152void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a);
153
154int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
155
156static inline int tcf_hash_release(struct tc_action *a, bool bind)
157{
158 return __tcf_hash_release(a, bind, false);
159}
160
161int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
162int tcf_unregister_action(struct tc_action_ops *a, struct pernet_operations *ops);
163int tcf_action_destroy(struct list_head *actions, int bind);
164int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
165 struct tcf_result *res);
166int tcf_action_init(struct net *net, struct nlattr *nla,
167 struct nlattr *est, char *n, int ovr,
168 int bind, struct list_head *);
169struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
170 struct nlattr *est, char *n, int ovr,
171 int bind);
172int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
173int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
174int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
175int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
176
177#define tc_no_actions(_exts) \
178 (list_empty(&(_exts)->actions))
179
180#define tc_for_each_action(_a, _exts) \
181 list_for_each_entry(a, &(_exts)->actions, list)
182
183static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
184 u64 packets, u64 lastuse)
185{
186 if (!a->ops->stats_update)
187 return;
188
189 a->ops->stats_update(a, bytes, packets, lastuse);
190}
191
192#else /* CONFIG_NET_CLS_ACT */
193
194#define tc_no_actions(_exts) true
195#define tc_for_each_action(_a, _exts) while ((void)(_a), 0)
196#define tcf_action_stats_update(a, bytes, packets, lastuse)
197
198#endif /* CONFIG_NET_CLS_ACT */
199#endif