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
37 atomic_t tcfa_drops;
38 atomic_t tcfa_overlimits;
39
40 struct net_rate_estimator __rcu *tcfa_rate_est;
41 spinlock_t tcfa_lock;
42 struct gnet_stats_basic_sync __percpu *cpu_bstats;
43 struct gnet_stats_basic_sync __percpu *cpu_bstats_hw;
44 struct gnet_stats_queue __percpu *cpu_qstats;
45 struct tc_cookie __rcu *user_cookie;
46 struct tcf_chain __rcu *goto_chain;
47 u32 tcfa_flags;
48 u8 hw_stats;
49 u8 used_hw_stats;
50 bool used_hw_stats_valid;
51 u32 in_hw_count;
52 };
53 #define tcf_index common.tcfa_index
54 #define tcf_refcnt common.tcfa_refcnt
55 #define tcf_bindcnt common.tcfa_bindcnt
56 #define tcf_action common.tcfa_action
57 #define tcf_tm common.tcfa_tm
58 #define tcf_bstats common.tcfa_bstats
59 #define tcf_rate_est common.tcfa_rate_est
60 #define tcf_lock common.tcfa_lock
61
62 #define TCA_ACT_HW_STATS_ANY (TCA_ACT_HW_STATS_IMMEDIATE | \
63 TCA_ACT_HW_STATS_DELAYED)
64
65 /* Reserve 16 bits for user-space. See TCA_ACT_FLAGS_NO_PERCPU_STATS. */
66 #define TCA_ACT_FLAGS_USER_BITS 16
67 #define TCA_ACT_FLAGS_USER_MASK 0xffff
68 #define TCA_ACT_FLAGS_POLICE (1U << TCA_ACT_FLAGS_USER_BITS)
69 #define TCA_ACT_FLAGS_BIND (1U << (TCA_ACT_FLAGS_USER_BITS + 1))
70 #define TCA_ACT_FLAGS_REPLACE (1U << (TCA_ACT_FLAGS_USER_BITS + 2))
71 #define TCA_ACT_FLAGS_NO_RTNL (1U << (TCA_ACT_FLAGS_USER_BITS + 3))
72 #define TCA_ACT_FLAGS_AT_INGRESS (1U << (TCA_ACT_FLAGS_USER_BITS + 4))
73
74 /* Update lastuse only if needed, to avoid dirtying a cache line.
75 * We use a temp variable to avoid fetching jiffies twice.
76 */
tcf_lastuse_update(struct tcf_t * tm)77 static inline void tcf_lastuse_update(struct tcf_t *tm)
78 {
79 unsigned long now = jiffies;
80
81 if (READ_ONCE(tm->lastuse) != now)
82 WRITE_ONCE(tm->lastuse, now);
83 if (unlikely(!READ_ONCE(tm->firstuse)))
84 WRITE_ONCE(tm->firstuse, now);
85 }
86
tcf_tm_dump(struct tcf_t * dtm,const struct tcf_t * stm)87 static inline void tcf_tm_dump(struct tcf_t *dtm, const struct tcf_t *stm)
88 {
89 unsigned long firstuse, now = jiffies;
90
91 dtm->install = jiffies_to_clock_t(now - READ_ONCE(stm->install));
92 dtm->lastuse = jiffies_to_clock_t(now - READ_ONCE(stm->lastuse));
93
94 firstuse = READ_ONCE(stm->firstuse);
95 dtm->firstuse = firstuse ?
96 jiffies_to_clock_t(now - firstuse) : 0;
97
98 dtm->expires = jiffies_to_clock_t(READ_ONCE(stm->expires));
99 }
100
tc_act_hw_stats(u8 hw_stats)101 static inline enum flow_action_hw_stats tc_act_hw_stats(u8 hw_stats)
102 {
103 if (WARN_ON_ONCE(hw_stats > TCA_ACT_HW_STATS_ANY))
104 return FLOW_ACTION_HW_STATS_DONT_CARE;
105 else if (!hw_stats)
106 return FLOW_ACTION_HW_STATS_DISABLED;
107
108 return hw_stats;
109 }
110
111 typedef void (*tc_action_priv_destructor)(void *priv);
112
113 struct tc_action_ops {
114 struct list_head head;
115 char kind[IFNAMSIZ];
116 enum tca_id id; /* identifier should match kind */
117 unsigned int net_id;
118 size_t size;
119 struct module *owner;
120 int (*act)(struct sk_buff *, const struct tc_action *,
121 struct tcf_result *); /* called under RCU BH lock*/
122 int (*dump)(struct sk_buff *, struct tc_action *, int, int);
123 void (*cleanup)(struct tc_action *);
124 int (*lookup)(struct net *net, struct tc_action **a, u32 index);
125 int (*init)(struct net *net, struct nlattr *nla,
126 struct nlattr *est, struct tc_action **act,
127 struct tcf_proto *tp,
128 u32 flags, struct netlink_ext_ack *extack);
129 int (*walk)(struct net *, struct sk_buff *,
130 struct netlink_callback *, int,
131 const struct tc_action_ops *,
132 struct netlink_ext_ack *);
133 void (*stats_update)(struct tc_action *, u64, u64, u64, u64, bool);
134 size_t (*get_fill_size)(const struct tc_action *act);
135 struct net_device *(*get_dev)(const struct tc_action *a,
136 tc_action_priv_destructor *destructor);
137 struct psample_group *
138 (*get_psample_group)(const struct tc_action *a,
139 tc_action_priv_destructor *destructor);
140 int (*offload_act_setup)(struct tc_action *act, void *entry_data,
141 u32 *index_inc, bool bind,
142 struct netlink_ext_ack *extack);
143 };
144
145 #ifdef CONFIG_NET_CLS_ACT
146
147 #define ACT_P_BOUND 0
148 #define ACT_P_CREATED 1
149 #define ACT_P_DELETED 1
150
151 struct tc_action_net {
152 struct tcf_idrinfo *idrinfo;
153 const struct tc_action_ops *ops;
154 };
155
156 static inline
tc_action_net_init(struct net * net,struct tc_action_net * tn,const struct tc_action_ops * ops)157 int tc_action_net_init(struct net *net, struct tc_action_net *tn,
158 const struct tc_action_ops *ops)
159 {
160 int err = 0;
161
162 tn->idrinfo = kmalloc(sizeof(*tn->idrinfo), GFP_KERNEL);
163 if (!tn->idrinfo)
164 return -ENOMEM;
165 tn->ops = ops;
166 tn->idrinfo->net = net;
167 mutex_init(&tn->idrinfo->lock);
168 idr_init(&tn->idrinfo->action_idr);
169 return err;
170 }
171
172 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
173 struct tcf_idrinfo *idrinfo);
174
tc_action_net_exit(struct list_head * net_list,unsigned int id)175 static inline void tc_action_net_exit(struct list_head *net_list,
176 unsigned int id)
177 {
178 struct net *net;
179
180 list_for_each_entry(net, net_list, exit_list) {
181 struct tc_action_net *tn = net_generic(net, id);
182
183 tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
184 kfree(tn->idrinfo);
185 }
186 }
187
188 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
189 struct netlink_callback *cb, int type,
190 const struct tc_action_ops *ops,
191 struct netlink_ext_ack *extack);
192 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index);
193 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
194 struct tc_action **a, const struct tc_action_ops *ops,
195 int bind, bool cpustats, u32 flags);
196 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
197 struct nlattr *est, struct tc_action **a,
198 const struct tc_action_ops *ops, int bind,
199 u32 flags);
200 void tcf_idr_insert_many(struct tc_action *actions[], int init_res[]);
201 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
202 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
203 struct tc_action **a, int bind);
204 int tcf_idr_release(struct tc_action *a, bool bind);
205
206 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
207 int tcf_unregister_action(struct tc_action_ops *a,
208 struct pernet_operations *ops);
209 #define NET_ACT_ALIAS_PREFIX "net-act-"
210 #define MODULE_ALIAS_NET_ACT(kind) MODULE_ALIAS(NET_ACT_ALIAS_PREFIX kind)
211 int tcf_action_destroy(struct tc_action *actions[], int bind);
212 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
213 int nr_actions, struct tcf_result *res);
214 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
215 struct nlattr *est,
216 struct tc_action *actions[], int init_res[], size_t *attr_size,
217 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack);
218 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
219 struct netlink_ext_ack *extack);
220 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
221 struct nlattr *nla, struct nlattr *est,
222 struct tc_action_ops *a_o, int *init_res,
223 u32 flags, struct netlink_ext_ack *extack);
224 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
225 int ref, bool terse);
226 int tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int, int);
227
tcf_action_update_bstats(struct tc_action * a,struct sk_buff * skb)228 static inline void tcf_action_update_bstats(struct tc_action *a,
229 struct sk_buff *skb)
230 {
231 if (likely(a->cpu_bstats)) {
232 bstats_update(this_cpu_ptr(a->cpu_bstats), skb);
233 return;
234 }
235 spin_lock(&a->tcfa_lock);
236 bstats_update(&a->tcfa_bstats, skb);
237 spin_unlock(&a->tcfa_lock);
238 }
239
tcf_action_inc_drop_qstats(struct tc_action * a)240 static inline void tcf_action_inc_drop_qstats(struct tc_action *a)
241 {
242 if (likely(a->cpu_qstats)) {
243 qstats_drop_inc(this_cpu_ptr(a->cpu_qstats));
244 return;
245 }
246 atomic_inc(&a->tcfa_drops);
247 }
248
tcf_action_inc_overlimit_qstats(struct tc_action * a)249 static inline void tcf_action_inc_overlimit_qstats(struct tc_action *a)
250 {
251 if (likely(a->cpu_qstats)) {
252 qstats_overlimit_inc(this_cpu_ptr(a->cpu_qstats));
253 return;
254 }
255 atomic_inc(&a->tcfa_overlimits);
256 }
257
258 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
259 u64 drops, bool hw);
260 int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
261
262 int tcf_action_update_hw_stats(struct tc_action *action);
263 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
264 void *cb_priv, bool add);
265 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
266 struct tcf_chain **handle,
267 struct netlink_ext_ack *newchain);
268 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
269 struct tcf_chain *newchain);
270
271 #ifdef CONFIG_INET
272 DECLARE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
273 #endif
274
275 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
276
277 #else /* !CONFIG_NET_CLS_ACT */
278
tcf_action_reoffload_cb(flow_indr_block_bind_cb_t * cb,void * cb_priv,bool add)279 static inline int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
280 void *cb_priv, bool add) {
281 return 0;
282 }
283
284 #endif /* CONFIG_NET_CLS_ACT */
285
tcf_action_stats_update(struct tc_action * a,u64 bytes,u64 packets,u64 drops,u64 lastuse,bool hw)286 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
287 u64 packets, u64 drops,
288 u64 lastuse, bool hw)
289 {
290 #ifdef CONFIG_NET_CLS_ACT
291 if (!a->ops->stats_update)
292 return;
293
294 a->ops->stats_update(a, bytes, packets, drops, lastuse, hw);
295 #endif
296 }
297
298
299 #endif
300