2 * net/sched/police.c Input police filter.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 * J Hadi Salim (action changes)
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/skbuff.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <net/act_api.h>
23 #include <net/netlink.h>
26 struct tcf_common common
;
35 struct psched_ratecfg rate
;
37 struct psched_ratecfg peak
;
40 #define to_police(pc) \
41 container_of(pc, struct tcf_police, common)
43 #define POL_TAB_MASK 15
44 static struct tcf_hashinfo police_hash_info
;
46 /* old policer structure from before tc actions */
47 struct tc_police_compat
{
53 struct tc_ratespec rate
;
54 struct tc_ratespec peakrate
;
57 /* Each policer is serialized by its individual spinlock */
59 static int tcf_act_police_walker(struct sk_buff
*skb
, struct netlink_callback
*cb
,
60 int type
, struct tc_action
*a
)
62 struct tcf_hashinfo
*hinfo
= a
->ops
->hinfo
;
63 struct hlist_head
*head
;
65 int err
= 0, index
= -1, i
= 0, s_i
= 0, n_i
= 0;
68 spin_lock_bh(&hinfo
->lock
);
72 for (i
= 0; i
< (POL_TAB_MASK
+ 1); i
++) {
73 head
= &hinfo
->htab
[tcf_hash(i
, POL_TAB_MASK
)];
75 hlist_for_each_entry_rcu(p
, head
, tcfc_head
) {
81 nest
= nla_nest_start(skb
, a
->order
);
84 if (type
== RTM_DELACTION
)
85 err
= tcf_action_dump_1(skb
, a
, 0, 1);
87 err
= tcf_action_dump_1(skb
, a
, 0, 0);
90 nla_nest_cancel(skb
, nest
);
93 nla_nest_end(skb
, nest
);
98 spin_unlock_bh(&hinfo
->lock
);
104 nla_nest_cancel(skb
, nest
);
108 static const struct nla_policy police_policy
[TCA_POLICE_MAX
+ 1] = {
109 [TCA_POLICE_RATE
] = { .len
= TC_RTAB_SIZE
},
110 [TCA_POLICE_PEAKRATE
] = { .len
= TC_RTAB_SIZE
},
111 [TCA_POLICE_AVRATE
] = { .type
= NLA_U32
},
112 [TCA_POLICE_RESULT
] = { .type
= NLA_U32
},
115 static int tcf_act_police_locate(struct net
*net
, struct nlattr
*nla
,
116 struct nlattr
*est
, struct tc_action
*a
,
121 struct nlattr
*tb
[TCA_POLICE_MAX
+ 1];
122 struct tc_police
*parm
;
123 struct tcf_police
*police
;
124 struct qdisc_rate_table
*R_tab
= NULL
, *P_tab
= NULL
;
125 struct tcf_hashinfo
*hinfo
= a
->ops
->hinfo
;
131 err
= nla_parse_nested(tb
, TCA_POLICE_MAX
, nla
, police_policy
);
135 if (tb
[TCA_POLICE_TBF
] == NULL
)
137 size
= nla_len(tb
[TCA_POLICE_TBF
]);
138 if (size
!= sizeof(*parm
) && size
!= sizeof(struct tc_police_compat
))
140 parm
= nla_data(tb
[TCA_POLICE_TBF
]);
143 if (tcf_hash_search(a
, parm
->index
)) {
144 police
= to_police(a
->priv
);
146 police
->tcf_bindcnt
+= 1;
147 police
->tcf_refcnt
+= 1;
157 police
= kzalloc(sizeof(*police
), GFP_KERNEL
);
161 police
->tcf_refcnt
= 1;
162 spin_lock_init(&police
->tcf_lock
);
164 police
->tcf_bindcnt
= 1;
166 if (parm
->rate
.rate
) {
168 R_tab
= qdisc_get_rtab(&parm
->rate
, tb
[TCA_POLICE_RATE
]);
172 if (parm
->peakrate
.rate
) {
173 P_tab
= qdisc_get_rtab(&parm
->peakrate
,
174 tb
[TCA_POLICE_PEAKRATE
]);
180 spin_lock_bh(&police
->tcf_lock
);
182 err
= gen_replace_estimator(&police
->tcf_bstats
,
183 &police
->tcf_rate_est
,
184 &police
->tcf_lock
, est
);
187 } else if (tb
[TCA_POLICE_AVRATE
] &&
188 (ret
== ACT_P_CREATED
||
189 !gen_estimator_active(&police
->tcf_bstats
,
190 &police
->tcf_rate_est
))) {
195 /* No failure allowed after this point */
196 police
->tcfp_mtu
= parm
->mtu
;
197 if (police
->tcfp_mtu
== 0) {
198 police
->tcfp_mtu
= ~0;
200 police
->tcfp_mtu
= 255 << R_tab
->rate
.cell_log
;
203 police
->rate_present
= true;
204 psched_ratecfg_precompute(&police
->rate
, &R_tab
->rate
, 0);
205 qdisc_put_rtab(R_tab
);
207 police
->rate_present
= false;
210 police
->peak_present
= true;
211 psched_ratecfg_precompute(&police
->peak
, &P_tab
->rate
, 0);
212 qdisc_put_rtab(P_tab
);
214 police
->peak_present
= false;
217 if (tb
[TCA_POLICE_RESULT
])
218 police
->tcfp_result
= nla_get_u32(tb
[TCA_POLICE_RESULT
]);
219 police
->tcfp_burst
= PSCHED_TICKS2NS(parm
->burst
);
220 police
->tcfp_toks
= police
->tcfp_burst
;
221 if (police
->peak_present
) {
222 police
->tcfp_mtu_ptoks
= (s64
) psched_l2t_ns(&police
->peak
,
224 police
->tcfp_ptoks
= police
->tcfp_mtu_ptoks
;
226 police
->tcf_action
= parm
->action
;
228 if (tb
[TCA_POLICE_AVRATE
])
229 police
->tcfp_ewma_rate
= nla_get_u32(tb
[TCA_POLICE_AVRATE
]);
231 spin_unlock_bh(&police
->tcf_lock
);
232 if (ret
!= ACT_P_CREATED
)
235 police
->tcfp_t_c
= ktime_to_ns(ktime_get());
236 police
->tcf_index
= parm
->index
? parm
->index
:
237 tcf_hash_new_index(a
->ops
->hinfo
);
238 h
= tcf_hash(police
->tcf_index
, POL_TAB_MASK
);
239 spin_lock_bh(&hinfo
->lock
);
240 hlist_add_head(&police
->tcf_head
, &hinfo
->htab
[h
]);
241 spin_unlock_bh(&hinfo
->lock
);
247 spin_unlock_bh(&police
->tcf_lock
);
249 qdisc_put_rtab(P_tab
);
250 qdisc_put_rtab(R_tab
);
251 if (ret
== ACT_P_CREATED
)
256 static int tcf_act_police_cleanup(struct tc_action
*a
, int bind
)
258 struct tcf_police
*p
= a
->priv
;
260 return tcf_hash_release(&p
->common
, bind
, &police_hash_info
);
264 static int tcf_act_police(struct sk_buff
*skb
, const struct tc_action
*a
,
265 struct tcf_result
*res
)
267 struct tcf_police
*police
= a
->priv
;
272 spin_lock(&police
->tcf_lock
);
274 bstats_update(&police
->tcf_bstats
, skb
);
276 if (police
->tcfp_ewma_rate
&&
277 police
->tcf_rate_est
.bps
>= police
->tcfp_ewma_rate
) {
278 police
->tcf_qstats
.overlimits
++;
279 if (police
->tcf_action
== TC_ACT_SHOT
)
280 police
->tcf_qstats
.drops
++;
281 spin_unlock(&police
->tcf_lock
);
282 return police
->tcf_action
;
285 if (qdisc_pkt_len(skb
) <= police
->tcfp_mtu
) {
286 if (!police
->rate_present
) {
287 spin_unlock(&police
->tcf_lock
);
288 return police
->tcfp_result
;
291 now
= ktime_to_ns(ktime_get());
292 toks
= min_t(s64
, now
- police
->tcfp_t_c
,
294 if (police
->peak_present
) {
295 ptoks
= toks
+ police
->tcfp_ptoks
;
296 if (ptoks
> police
->tcfp_mtu_ptoks
)
297 ptoks
= police
->tcfp_mtu_ptoks
;
298 ptoks
-= (s64
) psched_l2t_ns(&police
->peak
,
301 toks
+= police
->tcfp_toks
;
302 if (toks
> police
->tcfp_burst
)
303 toks
= police
->tcfp_burst
;
304 toks
-= (s64
) psched_l2t_ns(&police
->rate
, qdisc_pkt_len(skb
));
305 if ((toks
|ptoks
) >= 0) {
306 police
->tcfp_t_c
= now
;
307 police
->tcfp_toks
= toks
;
308 police
->tcfp_ptoks
= ptoks
;
309 spin_unlock(&police
->tcf_lock
);
310 return police
->tcfp_result
;
314 police
->tcf_qstats
.overlimits
++;
315 if (police
->tcf_action
== TC_ACT_SHOT
)
316 police
->tcf_qstats
.drops
++;
317 spin_unlock(&police
->tcf_lock
);
318 return police
->tcf_action
;
322 tcf_act_police_dump(struct sk_buff
*skb
, struct tc_action
*a
, int bind
, int ref
)
324 unsigned char *b
= skb_tail_pointer(skb
);
325 struct tcf_police
*police
= a
->priv
;
326 struct tc_police opt
= {
327 .index
= police
->tcf_index
,
328 .action
= police
->tcf_action
,
329 .mtu
= police
->tcfp_mtu
,
330 .burst
= PSCHED_NS2TICKS(police
->tcfp_burst
),
331 .refcnt
= police
->tcf_refcnt
- ref
,
332 .bindcnt
= police
->tcf_bindcnt
- bind
,
335 if (police
->rate_present
)
336 psched_ratecfg_getrate(&opt
.rate
, &police
->rate
);
337 if (police
->peak_present
)
338 psched_ratecfg_getrate(&opt
.peakrate
, &police
->peak
);
339 if (nla_put(skb
, TCA_POLICE_TBF
, sizeof(opt
), &opt
))
340 goto nla_put_failure
;
341 if (police
->tcfp_result
&&
342 nla_put_u32(skb
, TCA_POLICE_RESULT
, police
->tcfp_result
))
343 goto nla_put_failure
;
344 if (police
->tcfp_ewma_rate
&&
345 nla_put_u32(skb
, TCA_POLICE_AVRATE
, police
->tcfp_ewma_rate
))
346 goto nla_put_failure
;
354 MODULE_AUTHOR("Alexey Kuznetsov");
355 MODULE_DESCRIPTION("Policing actions");
356 MODULE_LICENSE("GPL");
358 static struct tc_action_ops act_police_ops
= {
360 .hinfo
= &police_hash_info
,
361 .type
= TCA_ID_POLICE
,
362 .owner
= THIS_MODULE
,
363 .act
= tcf_act_police
,
364 .dump
= tcf_act_police_dump
,
365 .cleanup
= tcf_act_police_cleanup
,
366 .init
= tcf_act_police_locate
,
367 .walk
= tcf_act_police_walker
371 police_init_module(void)
373 int err
= tcf_hashinfo_init(&police_hash_info
, POL_TAB_MASK
);
376 err
= tcf_register_action(&act_police_ops
);
378 tcf_hashinfo_destroy(&police_hash_info
);
383 police_cleanup_module(void)
385 tcf_hashinfo_destroy(&police_hash_info
);
386 tcf_unregister_action(&act_police_ops
);
389 module_init(police_init_module
);
390 module_exit(police_cleanup_module
);