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1 | #ifndef __NET_ACT_API_H | |
2 | #define __NET_ACT_API_H | |
3 | ||
4 | /* | |
5 | * Public 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 | ||
13 | ||
14 | struct tcf_hashinfo { | |
15 | struct hlist_head *htab; | |
16 | unsigned int hmask; | |
17 | spinlock_t lock; | |
18 | u32 index; | |
19 | }; | |
20 | ||
21 | struct tc_action_ops; | |
22 | ||
23 | struct tc_action { | |
24 | const struct tc_action_ops *ops; | |
25 | __u32 type; /* for backward compat(TCA_OLD_COMPAT) */ | |
26 | __u32 order; | |
27 | struct list_head list; | |
28 | struct tcf_hashinfo *hinfo; | |
29 | ||
30 | struct hlist_node tcfa_head; | |
31 | u32 tcfa_index; | |
32 | int tcfa_refcnt; | |
33 | int tcfa_bindcnt; | |
34 | u32 tcfa_capab; | |
35 | int tcfa_action; | |
36 | struct tcf_t tcfa_tm; | |
37 | struct gnet_stats_basic_packed tcfa_bstats; | |
38 | struct gnet_stats_queue tcfa_qstats; | |
39 | struct gnet_stats_rate_est64 tcfa_rate_est; | |
40 | spinlock_t tcfa_lock; | |
41 | struct rcu_head tcfa_rcu; | |
42 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; | |
43 | struct gnet_stats_queue __percpu *cpu_qstats; | |
44 | }; | |
45 | #define tcf_act common.tcfa_act | |
46 | #define tcf_head common.tcfa_head | |
47 | #define tcf_index common.tcfa_index | |
48 | #define tcf_refcnt common.tcfa_refcnt | |
49 | #define tcf_bindcnt common.tcfa_bindcnt | |
50 | #define tcf_capab common.tcfa_capab | |
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 | #define tcf_rcu common.tcfa_rcu | |
58 | ||
59 | static inline unsigned int tcf_hash(u32 index, unsigned int hmask) | |
60 | { | |
61 | return index & hmask; | |
62 | } | |
63 | ||
64 | static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask) | |
65 | { | |
66 | int i; | |
67 | ||
68 | spin_lock_init(&hf->lock); | |
69 | hf->index = 0; | |
70 | hf->hmask = mask; | |
71 | hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head), | |
72 | GFP_KERNEL); | |
73 | if (!hf->htab) | |
74 | return -ENOMEM; | |
75 | for (i = 0; i < mask + 1; i++) | |
76 | INIT_HLIST_HEAD(&hf->htab[i]); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | /* Update lastuse only if needed, to avoid dirtying a cache line. | |
81 | * We use a temp variable to avoid fetching jiffies twice. | |
82 | */ | |
83 | static inline void tcf_lastuse_update(struct tcf_t *tm) | |
84 | { | |
85 | unsigned long now = jiffies; | |
86 | ||
87 | if (tm->lastuse != now) | |
88 | tm->lastuse = now; | |
89 | if (unlikely(!tm->firstuse)) | |
90 | tm->firstuse = now; | |
91 | } | |
92 | ||
93 | static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm) | |
94 | { | |
95 | dtm->install = jiffies_to_clock_t(jiffies - stm->install); | |
96 | dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse); | |
97 | dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse); | |
98 | dtm->expires = jiffies_to_clock_t(stm->expires); | |
99 | } | |
100 | ||
101 | #ifdef CONFIG_NET_CLS_ACT | |
102 | ||
103 | #define ACT_P_CREATED 1 | |
104 | #define ACT_P_DELETED 1 | |
105 | ||
106 | struct tc_action_ops { | |
107 | struct list_head head; | |
108 | char kind[IFNAMSIZ]; | |
109 | __u32 type; /* TBD to match kind */ | |
110 | size_t size; | |
111 | struct module *owner; | |
112 | int (*act)(struct sk_buff *, const struct tc_action *, | |
113 | struct tcf_result *); | |
114 | int (*dump)(struct sk_buff *, struct tc_action *, int, int); | |
115 | void (*cleanup)(struct tc_action *, int bind); | |
116 | int (*lookup)(struct net *, struct tc_action **, u32); | |
117 | int (*init)(struct net *net, struct nlattr *nla, | |
118 | struct nlattr *est, struct tc_action **act, int ovr, | |
119 | int bind); | |
120 | int (*walk)(struct net *, struct sk_buff *, | |
121 | struct netlink_callback *, int, const struct tc_action_ops *); | |
122 | void (*stats_update)(struct tc_action *, u64, u32, u64); | |
123 | }; | |
124 | ||
125 | struct tc_action_net { | |
126 | struct tcf_hashinfo *hinfo; | |
127 | const struct tc_action_ops *ops; | |
128 | }; | |
129 | ||
130 | static inline | |
131 | int tc_action_net_init(struct tc_action_net *tn, | |
132 | const struct tc_action_ops *ops, unsigned int mask) | |
133 | { | |
134 | int err = 0; | |
135 | ||
136 | tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL); | |
137 | if (!tn->hinfo) | |
138 | return -ENOMEM; | |
139 | tn->ops = ops; | |
140 | err = tcf_hashinfo_init(tn->hinfo, mask); | |
141 | if (err) | |
142 | kfree(tn->hinfo); | |
143 | return err; | |
144 | } | |
145 | ||
146 | void tcf_hashinfo_destroy(const struct tc_action_ops *ops, | |
147 | struct tcf_hashinfo *hinfo); | |
148 | ||
149 | static inline void tc_action_net_exit(struct tc_action_net *tn) | |
150 | { | |
151 | tcf_hashinfo_destroy(tn->ops, tn->hinfo); | |
152 | kfree(tn->hinfo); | |
153 | } | |
154 | ||
155 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, | |
156 | struct netlink_callback *cb, int type, | |
157 | const struct tc_action_ops *ops); | |
158 | int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index); | |
159 | u32 tcf_hash_new_index(struct tc_action_net *tn); | |
160 | bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a, | |
161 | int bind); | |
162 | int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est, | |
163 | struct tc_action **a, const struct tc_action_ops *ops, int bind, | |
164 | bool cpustats); | |
165 | void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est); | |
166 | void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a); | |
167 | ||
168 | int __tcf_hash_release(struct tc_action *a, bool bind, bool strict); | |
169 | ||
170 | static inline int tcf_hash_release(struct tc_action *a, bool bind) | |
171 | { | |
172 | return __tcf_hash_release(a, bind, false); | |
173 | } | |
174 | ||
175 | int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); | |
176 | int tcf_unregister_action(struct tc_action_ops *a, | |
177 | struct pernet_operations *ops); | |
178 | int tcf_action_destroy(struct list_head *actions, int bind); | |
179 | int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, | |
180 | int nr_actions, struct tcf_result *res); | |
181 | int tcf_action_init(struct net *net, struct nlattr *nla, | |
182 | struct nlattr *est, char *n, int ovr, | |
183 | int bind, struct list_head *); | |
184 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, | |
185 | struct nlattr *est, char *n, int ovr, | |
186 | int bind); | |
187 | int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int); | |
188 | int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int); | |
189 | int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int); | |
190 | int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int); | |
191 | ||
192 | #endif /* CONFIG_NET_CLS_ACT */ | |
193 | ||
194 | static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes, | |
195 | u64 packets, u64 lastuse) | |
196 | { | |
197 | #ifdef CONFIG_NET_CLS_ACT | |
198 | if (!a->ops->stats_update) | |
199 | return; | |
200 | ||
201 | a->ops->stats_update(a, bytes, packets, lastuse); | |
202 | #endif | |
203 | } | |
204 | ||
205 | #endif |