xref: /openbmc/linux/include/net/act_api.h (revision 5d0e4d78)
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 net_rate_estimator __rcu *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 	struct tc_cookie	*act_cookie;
45 	struct tcf_chain	*goto_chain;
46 };
47 #define tcf_head	common.tcfa_head
48 #define tcf_index	common.tcfa_index
49 #define tcf_refcnt	common.tcfa_refcnt
50 #define tcf_bindcnt	common.tcfa_bindcnt
51 #define tcf_capab	common.tcfa_capab
52 #define tcf_action	common.tcfa_action
53 #define tcf_tm		common.tcfa_tm
54 #define tcf_bstats	common.tcfa_bstats
55 #define tcf_qstats	common.tcfa_qstats
56 #define tcf_rate_est	common.tcfa_rate_est
57 #define tcf_lock	common.tcfa_lock
58 #define tcf_rcu		common.tcfa_rcu
59 
60 static inline unsigned int tcf_hash(u32 index, unsigned int hmask)
61 {
62 	return index & hmask;
63 }
64 
65 static inline int tcf_hashinfo_init(struct tcf_hashinfo *hf, unsigned int mask)
66 {
67 	int i;
68 
69 	spin_lock_init(&hf->lock);
70 	hf->index = 0;
71 	hf->hmask = mask;
72 	hf->htab = kzalloc((mask + 1) * sizeof(struct hlist_head),
73 			   GFP_KERNEL);
74 	if (!hf->htab)
75 		return -ENOMEM;
76 	for (i = 0; i < mask + 1; i++)
77 		INIT_HLIST_HEAD(&hf->htab[i]);
78 	return 0;
79 }
80 
81 /* Update lastuse only if needed, to avoid dirtying a cache line.
82  * We use a temp variable to avoid fetching jiffies twice.
83  */
84 static inline void tcf_lastuse_update(struct tcf_t *tm)
85 {
86 	unsigned long now = jiffies;
87 
88 	if (tm->lastuse != now)
89 		tm->lastuse = now;
90 	if (unlikely(!tm->firstuse))
91 		tm->firstuse = now;
92 }
93 
94 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
95 {
96 	dtm->install = jiffies_to_clock_t(jiffies - stm->install);
97 	dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
98 	dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
99 	dtm->expires = jiffies_to_clock_t(stm->expires);
100 }
101 
102 #ifdef CONFIG_NET_CLS_ACT
103 
104 #define ACT_P_CREATED 1
105 #define ACT_P_DELETED 1
106 
107 struct tc_action_ops {
108 	struct list_head head;
109 	char    kind[IFNAMSIZ];
110 	__u32   type; /* TBD to match kind */
111 	size_t	size;
112 	struct module		*owner;
113 	int     (*act)(struct sk_buff *, const struct tc_action *,
114 		       struct tcf_result *);
115 	int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
116 	void	(*cleanup)(struct tc_action *, int bind);
117 	int     (*lookup)(struct net *, struct tc_action **, u32);
118 	int     (*init)(struct net *net, struct nlattr *nla,
119 			struct nlattr *est, struct tc_action **act, int ovr,
120 			int bind);
121 	int     (*walk)(struct net *, struct sk_buff *,
122 			struct netlink_callback *, int, const struct tc_action_ops *);
123 	void	(*stats_update)(struct tc_action *, u64, u32, u64);
124 	int	(*get_dev)(const struct tc_action *a, struct net *net,
125 			   struct net_device **mirred_dev);
126 };
127 
128 struct tc_action_net {
129 	struct tcf_hashinfo *hinfo;
130 	const struct tc_action_ops *ops;
131 };
132 
133 static inline
134 int tc_action_net_init(struct tc_action_net *tn,
135 		       const struct tc_action_ops *ops, unsigned int mask)
136 {
137 	int err = 0;
138 
139 	tn->hinfo = kmalloc(sizeof(*tn->hinfo), GFP_KERNEL);
140 	if (!tn->hinfo)
141 		return -ENOMEM;
142 	tn->ops = ops;
143 	err = tcf_hashinfo_init(tn->hinfo, mask);
144 	if (err)
145 		kfree(tn->hinfo);
146 	return err;
147 }
148 
149 void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
150 			  struct tcf_hashinfo *hinfo);
151 
152 static inline void tc_action_net_exit(struct tc_action_net *tn)
153 {
154 	tcf_hashinfo_destroy(tn->ops, tn->hinfo);
155 	kfree(tn->hinfo);
156 }
157 
158 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
159 		       struct netlink_callback *cb, int type,
160 		       const struct tc_action_ops *ops);
161 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
162 u32 tcf_hash_new_index(struct tc_action_net *tn);
163 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
164 		    int bind);
165 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
166 		    struct tc_action **a, const struct tc_action_ops *ops, int bind,
167 		    bool cpustats);
168 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est);
169 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a);
170 
171 int __tcf_hash_release(struct tc_action *a, bool bind, bool strict);
172 
173 static inline int tcf_hash_release(struct tc_action *a, bool bind)
174 {
175 	return __tcf_hash_release(a, bind, false);
176 }
177 
178 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
179 int tcf_unregister_action(struct tc_action_ops *a,
180 			  struct pernet_operations *ops);
181 int tcf_action_destroy(struct list_head *actions, int bind);
182 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
183 		    int nr_actions, struct tcf_result *res);
184 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
185 		    struct nlattr *est, char *name, int ovr, int bind,
186 		    struct list_head *actions);
187 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
188 				    struct nlattr *nla, struct nlattr *est,
189 				    char *name, int ovr, int bind);
190 int tcf_action_dump(struct sk_buff *skb, struct list_head *, int, int);
191 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
192 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
193 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
194 
195 #endif /* CONFIG_NET_CLS_ACT */
196 
197 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
198 					   u64 packets, u64 lastuse)
199 {
200 #ifdef CONFIG_NET_CLS_ACT
201 	if (!a->ops->stats_update)
202 		return;
203 
204 	a->ops->stats_update(a, bytes, packets, lastuse);
205 #endif
206 }
207 
208 #endif
209