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/flow_offload.h>
11 #include <net/sch_generic.h>
12 #include <net/pkt_sched.h>
13 #include <net/net_namespace.h>
14 #include <net/netns/generic.h>
15 
16 struct tcf_idrinfo {
17 	struct mutex	lock;
18 	struct idr	action_idr;
19 	struct net	*net;
20 };
21 
22 struct tc_action_ops;
23 
24 struct tc_action {
25 	const struct tc_action_ops	*ops;
26 	__u32				type; /* for backward compat(TCA_OLD_COMPAT) */
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_sync	tcfa_bstats;
35 	struct gnet_stats_basic_sync	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_sync __percpu *cpu_bstats;
40 	struct gnet_stats_basic_sync __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 	u32			tcfa_flags;
45 	u8			hw_stats;
46 	u8			used_hw_stats;
47 	bool			used_hw_stats_valid;
48 	u32			in_hw_count;
49 };
50 #define tcf_index	common.tcfa_index
51 #define tcf_refcnt	common.tcfa_refcnt
52 #define tcf_bindcnt	common.tcfa_bindcnt
53 #define tcf_action	common.tcfa_action
54 #define tcf_tm		common.tcfa_tm
55 #define tcf_bstats	common.tcfa_bstats
56 #define tcf_qstats	common.tcfa_qstats
57 #define tcf_rate_est	common.tcfa_rate_est
58 #define tcf_lock	common.tcfa_lock
59 
60 #define TCA_ACT_HW_STATS_ANY (TCA_ACT_HW_STATS_IMMEDIATE | \
61 			      TCA_ACT_HW_STATS_DELAYED)
62 
63 /* Reserve 16 bits for user-space. See TCA_ACT_FLAGS_NO_PERCPU_STATS. */
64 #define TCA_ACT_FLAGS_USER_BITS 16
65 #define TCA_ACT_FLAGS_USER_MASK 0xffff
66 #define TCA_ACT_FLAGS_POLICE	(1U << TCA_ACT_FLAGS_USER_BITS)
67 #define TCA_ACT_FLAGS_BIND	(1U << (TCA_ACT_FLAGS_USER_BITS + 1))
68 #define TCA_ACT_FLAGS_REPLACE	(1U << (TCA_ACT_FLAGS_USER_BITS + 2))
69 #define TCA_ACT_FLAGS_NO_RTNL	(1U << (TCA_ACT_FLAGS_USER_BITS + 3))
70 
71 /* Update lastuse only if needed, to avoid dirtying a cache line.
72  * We use a temp variable to avoid fetching jiffies twice.
73  */
tcf_lastuse_update(struct tcf_t * tm)74 static inline void tcf_lastuse_update(struct tcf_t *tm)
75 {
76 	unsigned long now = jiffies;
77 
78 	if (tm->lastuse != now)
79 		tm->lastuse = now;
80 	if (unlikely(!tm->firstuse))
81 		tm->firstuse = now;
82 }
83 
tcf_tm_dump(struct tcf_t * dtm,const struct tcf_t * stm)84 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
85 {
86 	dtm->install = jiffies_to_clock_t(jiffies - stm->install);
87 	dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
88 	dtm->firstuse = stm->firstuse ?
89 		jiffies_to_clock_t(jiffies - stm->firstuse) : 0;
90 	dtm->expires = jiffies_to_clock_t(stm->expires);
91 }
92 
tc_act_hw_stats(u8 hw_stats)93 static inline enum flow_action_hw_stats tc_act_hw_stats(u8 hw_stats)
94 {
95 	if (WARN_ON_ONCE(hw_stats > TCA_ACT_HW_STATS_ANY))
96 		return FLOW_ACTION_HW_STATS_DONT_CARE;
97 	else if (!hw_stats)
98 		return FLOW_ACTION_HW_STATS_DISABLED;
99 
100 	return hw_stats;
101 }
102 
103 #ifdef CONFIG_NET_CLS_ACT
104 
105 #define ACT_P_CREATED 1
106 #define ACT_P_DELETED 1
107 
108 typedef void (*tc_action_priv_destructor)(void *priv);
109 
110 struct tc_action_ops {
111 	struct list_head head;
112 	char    kind[IFNAMSIZ];
113 	enum tca_id  id; /* identifier should match kind */
114 	size_t	size;
115 	struct module		*owner;
116 	int     (*act)(struct sk_buff *, const struct tc_action *,
117 		       struct tcf_result *); /* called under RCU BH lock*/
118 	int     (*dump)(struct sk_buff *, struct tc_action *, int, int);
119 	void	(*cleanup)(struct tc_action *);
120 	int     (*lookup)(struct net *net, struct tc_action **a, u32 index);
121 	int     (*init)(struct net *net, struct nlattr *nla,
122 			struct nlattr *est, struct tc_action **act,
123 			struct tcf_proto *tp,
124 			u32 flags, struct netlink_ext_ack *extack);
125 	int     (*walk)(struct net *, struct sk_buff *,
126 			struct netlink_callback *, int,
127 			const struct tc_action_ops *,
128 			struct netlink_ext_ack *);
129 	void	(*stats_update)(struct tc_action *, u64, u64, u64, u64, bool);
130 	size_t  (*get_fill_size)(const struct tc_action *act);
131 	struct net_device *(*get_dev)(const struct tc_action *a,
132 				      tc_action_priv_destructor *destructor);
133 	struct psample_group *
134 	(*get_psample_group)(const struct tc_action *a,
135 			     tc_action_priv_destructor *destructor);
136 	int     (*offload_act_setup)(struct tc_action *act, void *entry_data,
137 				     u32 *index_inc, bool bind,
138 				     struct netlink_ext_ack *extack);
139 };
140 
141 struct tc_action_net {
142 	struct tcf_idrinfo *idrinfo;
143 	const struct tc_action_ops *ops;
144 };
145 
146 static inline
tc_action_net_init(struct net * net,struct tc_action_net * tn,const struct tc_action_ops * ops)147 int tc_action_net_init(struct net *net, struct tc_action_net *tn,
148 		       const struct tc_action_ops *ops)
149 {
150 	int err = 0;
151 
152 	tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
153 	if (!tn->idrinfo)
154 		return -ENOMEM;
155 	tn->ops = ops;
156 	tn->idrinfo->net = net;
157 	mutex_init(&tn->idrinfo->lock);
158 	idr_init(&tn->idrinfo->action_idr);
159 	return err;
160 }
161 
162 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
163 			 struct tcf_idrinfo *idrinfo);
164 
tc_action_net_exit(struct list_head * net_list,unsigned int id)165 static inline void tc_action_net_exit(struct list_head *net_list,
166 				      unsigned int id)
167 {
168 	struct net *net;
169 
170 	rtnl_lock();
171 	list_for_each_entry(net, net_list, exit_list) {
172 		struct tc_action_net *tn = net_generic(net, id);
173 
174 		tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
175 		kfree(tn->idrinfo);
176 	}
177 	rtnl_unlock();
178 }
179 
180 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
181 		       struct netlink_callback *cb, int type,
182 		       const struct tc_action_ops *ops,
183 		       struct netlink_ext_ack *extack);
184 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
185 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
186 		   struct tc_action **a, const struct tc_action_ops *ops,
187 		   int bind, bool cpustats, u32 flags);
188 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
189 			      struct nlattr *est, struct tc_action **a,
190 			      const struct tc_action_ops *ops, int bind,
191 			      u32 flags);
192 void tcf_idr_insert_many(struct tc_action *actions[]);
193 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
194 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
195 			struct tc_action **a, int bind);
196 int tcf_idr_release(struct tc_action *a, bool bind);
197 
198 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
199 int tcf_unregister_action(struct tc_action_ops *a,
200 			  struct pernet_operations *ops);
201 int tcf_action_destroy(struct tc_action *actions[], int bind);
202 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
203 		    int nr_actions, struct tcf_result *res);
204 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
205 		    struct nlattr *est,
206 		    struct tc_action *actions[], int init_res[], size_t *attr_size,
207 		    u32 flags, u32 fl_flags, struct netlink_ext_ack *extack);
208 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police,
209 					 bool rtnl_held,
210 					 struct netlink_ext_ack *extack);
211 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
212 				    struct nlattr *nla, struct nlattr *est,
213 				    struct tc_action_ops *a_o, int *init_res,
214 				    u32 flags, struct netlink_ext_ack *extack);
215 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
216 		    int ref, bool terse);
217 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
218 int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int, int);
219 
tcf_action_update_bstats(struct tc_action * a,struct sk_buff * skb)220 static inline void tcf_action_update_bstats(struct tc_action *a,
221 					    struct sk_buff *skb)
222 {
223 	if (likely(a->cpu_bstats)) {
224 		bstats_update(this_cpu_ptr(a->cpu_bstats), skb);
225 		return;
226 	}
227 	spin_lock(&a->tcfa_lock);
228 	bstats_update(&a->tcfa_bstats, skb);
229 	spin_unlock(&a->tcfa_lock);
230 }
231 
tcf_action_inc_drop_qstats(struct tc_action * a)232 static inline void tcf_action_inc_drop_qstats(struct tc_action *a)
233 {
234 	if (likely(a->cpu_qstats)) {
235 		qstats_drop_inc(this_cpu_ptr(a->cpu_qstats));
236 		return;
237 	}
238 	spin_lock(&a->tcfa_lock);
239 	qstats_drop_inc(&a->tcfa_qstats);
240 	spin_unlock(&a->tcfa_lock);
241 }
242 
tcf_action_inc_overlimit_qstats(struct tc_action * a)243 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a)
244 {
245 	if (likely(a->cpu_qstats)) {
246 		qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats));
247 		return;
248 	}
249 	spin_lock(&a->tcfa_lock);
250 	qstats_overlimit_inc(&a->tcfa_qstats);
251 	spin_unlock(&a->tcfa_lock);
252 }
253 
254 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
255 			     u64 drops, bool hw);
256 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
257 
258 int tcf_action_update_hw_stats(struct tc_action *action);
259 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
260 			    void *cb_priv, bool add);
261 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
262 			     struct tcf_chain **handle,
263 			     struct netlink_ext_ack *newchain);
264 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
265 					 struct tcf_chain *newchain);
266 
267 #ifdef CONFIG_INET
268 DECLARE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
269 #endif
270 
271 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
272 
273 #else /* !CONFIG_NET_CLS_ACT */
274 
tcf_action_reoffload_cb(flow_indr_block_bind_cb_t * cb,void * cb_priv,bool add)275 static inline int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
276 					  void *cb_priv, bool add) {
277 	return 0;
278 }
279 
280 #endif /* CONFIG_NET_CLS_ACT */
281 
tcf_action_stats_update(struct tc_action * a,u64 bytes,u64 packets,u64 drops,u64 lastuse,bool hw)282 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
283 					   u64 packets, u64 drops,
284 					   u64 lastuse, bool hw)
285 {
286 #ifdef CONFIG_NET_CLS_ACT
287 	if (!a->ops->stats_update)
288 		return;
289 
290 	a->ops->stats_update(a, bytes, packets, drops, lastuse, hw);
291 #endif
292 }
293 
294 
295 #endif
296