2 * net/sched/act_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
45 /* old policer structure from before tc actions */
46 struct tc_police_compat
{
52 struct tc_ratespec rate
;
53 struct tc_ratespec peakrate
;
56 /* Each policer is serialized by its individual spinlock */
58 static int police_net_id
;
60 static int tcf_act_police_walker(struct net
*net
, struct sk_buff
*skb
,
61 struct netlink_callback
*cb
, int type
,
64 struct tc_action_net
*tn
= net_generic(net
, police_net_id
);
65 struct tcf_hashinfo
*hinfo
= tn
->hinfo
;
66 struct hlist_head
*head
;
68 int err
= 0, index
= -1, i
= 0, s_i
= 0, n_i
= 0;
71 spin_lock_bh(&hinfo
->lock
);
75 for (i
= 0; i
< (POL_TAB_MASK
+ 1); i
++) {
76 head
= &hinfo
->htab
[tcf_hash(i
, POL_TAB_MASK
)];
78 hlist_for_each_entry_rcu(p
, head
, tcfc_head
) {
84 nest
= nla_nest_start(skb
, a
->order
);
87 if (type
== RTM_DELACTION
)
88 err
= tcf_action_dump_1(skb
, a
, 0, 1);
90 err
= tcf_action_dump_1(skb
, a
, 0, 0);
93 nla_nest_cancel(skb
, nest
);
96 nla_nest_end(skb
, nest
);
101 spin_unlock_bh(&hinfo
->lock
);
107 nla_nest_cancel(skb
, nest
);
111 static const struct nla_policy police_policy
[TCA_POLICE_MAX
+ 1] = {
112 [TCA_POLICE_RATE
] = { .len
= TC_RTAB_SIZE
},
113 [TCA_POLICE_PEAKRATE
] = { .len
= TC_RTAB_SIZE
},
114 [TCA_POLICE_AVRATE
] = { .type
= NLA_U32
},
115 [TCA_POLICE_RESULT
] = { .type
= NLA_U32
},
118 static int tcf_act_police_locate(struct net
*net
, struct nlattr
*nla
,
119 struct nlattr
*est
, struct tc_action
*a
,
124 struct nlattr
*tb
[TCA_POLICE_MAX
+ 1];
125 struct tc_police
*parm
;
126 struct tcf_police
*police
;
127 struct qdisc_rate_table
*R_tab
= NULL
, *P_tab
= NULL
;
128 struct tc_action_net
*tn
= net_generic(net
, police_net_id
);
129 struct tcf_hashinfo
*hinfo
= tn
->hinfo
;
135 err
= nla_parse_nested(tb
, TCA_POLICE_MAX
, nla
, police_policy
);
139 if (tb
[TCA_POLICE_TBF
] == NULL
)
141 size
= nla_len(tb
[TCA_POLICE_TBF
]);
142 if (size
!= sizeof(*parm
) && size
!= sizeof(struct tc_police_compat
))
144 parm
= nla_data(tb
[TCA_POLICE_TBF
]);
147 if (tcf_hash_search(tn
, a
, parm
->index
)) {
148 police
= to_police(a
->priv
);
150 police
->tcf_bindcnt
+= 1;
151 police
->tcf_refcnt
+= 1;
161 police
= kzalloc(sizeof(*police
), GFP_KERNEL
);
165 police
->tcf_refcnt
= 1;
166 spin_lock_init(&police
->tcf_lock
);
168 police
->tcf_bindcnt
= 1;
170 if (parm
->rate
.rate
) {
172 R_tab
= qdisc_get_rtab(&parm
->rate
, tb
[TCA_POLICE_RATE
]);
176 if (parm
->peakrate
.rate
) {
177 P_tab
= qdisc_get_rtab(&parm
->peakrate
,
178 tb
[TCA_POLICE_PEAKRATE
]);
184 spin_lock_bh(&police
->tcf_lock
);
186 err
= gen_replace_estimator(&police
->tcf_bstats
, NULL
,
187 &police
->tcf_rate_est
,
188 &police
->tcf_lock
, est
);
191 } else if (tb
[TCA_POLICE_AVRATE
] &&
192 (ret
== ACT_P_CREATED
||
193 !gen_estimator_active(&police
->tcf_bstats
,
194 &police
->tcf_rate_est
))) {
199 /* No failure allowed after this point */
200 police
->tcfp_mtu
= parm
->mtu
;
201 if (police
->tcfp_mtu
== 0) {
202 police
->tcfp_mtu
= ~0;
204 police
->tcfp_mtu
= 255 << R_tab
->rate
.cell_log
;
207 police
->rate_present
= true;
208 psched_ratecfg_precompute(&police
->rate
, &R_tab
->rate
, 0);
209 qdisc_put_rtab(R_tab
);
211 police
->rate_present
= false;
214 police
->peak_present
= true;
215 psched_ratecfg_precompute(&police
->peak
, &P_tab
->rate
, 0);
216 qdisc_put_rtab(P_tab
);
218 police
->peak_present
= false;
221 if (tb
[TCA_POLICE_RESULT
])
222 police
->tcfp_result
= nla_get_u32(tb
[TCA_POLICE_RESULT
]);
223 police
->tcfp_burst
= PSCHED_TICKS2NS(parm
->burst
);
224 police
->tcfp_toks
= police
->tcfp_burst
;
225 if (police
->peak_present
) {
226 police
->tcfp_mtu_ptoks
= (s64
) psched_l2t_ns(&police
->peak
,
228 police
->tcfp_ptoks
= police
->tcfp_mtu_ptoks
;
230 police
->tcf_action
= parm
->action
;
232 if (tb
[TCA_POLICE_AVRATE
])
233 police
->tcfp_ewma_rate
= nla_get_u32(tb
[TCA_POLICE_AVRATE
]);
235 spin_unlock_bh(&police
->tcf_lock
);
236 if (ret
!= ACT_P_CREATED
)
239 police
->tcfp_t_c
= ktime_get_ns();
240 police
->tcf_index
= parm
->index
? parm
->index
:
241 tcf_hash_new_index(tn
);
242 h
= tcf_hash(police
->tcf_index
, POL_TAB_MASK
);
243 spin_lock_bh(&hinfo
->lock
);
244 hlist_add_head(&police
->tcf_head
, &hinfo
->htab
[h
]);
245 spin_unlock_bh(&hinfo
->lock
);
251 spin_unlock_bh(&police
->tcf_lock
);
253 qdisc_put_rtab(P_tab
);
254 qdisc_put_rtab(R_tab
);
255 if (ret
== ACT_P_CREATED
)
260 static int tcf_act_police(struct sk_buff
*skb
, const struct tc_action
*a
,
261 struct tcf_result
*res
)
263 struct tcf_police
*police
= a
->priv
;
268 spin_lock(&police
->tcf_lock
);
270 bstats_update(&police
->tcf_bstats
, skb
);
272 if (police
->tcfp_ewma_rate
&&
273 police
->tcf_rate_est
.bps
>= police
->tcfp_ewma_rate
) {
274 police
->tcf_qstats
.overlimits
++;
275 if (police
->tcf_action
== TC_ACT_SHOT
)
276 police
->tcf_qstats
.drops
++;
277 spin_unlock(&police
->tcf_lock
);
278 return police
->tcf_action
;
281 if (qdisc_pkt_len(skb
) <= police
->tcfp_mtu
) {
282 if (!police
->rate_present
) {
283 spin_unlock(&police
->tcf_lock
);
284 return police
->tcfp_result
;
287 now
= ktime_get_ns();
288 toks
= min_t(s64
, now
- police
->tcfp_t_c
,
290 if (police
->peak_present
) {
291 ptoks
= toks
+ police
->tcfp_ptoks
;
292 if (ptoks
> police
->tcfp_mtu_ptoks
)
293 ptoks
= police
->tcfp_mtu_ptoks
;
294 ptoks
-= (s64
) psched_l2t_ns(&police
->peak
,
297 toks
+= police
->tcfp_toks
;
298 if (toks
> police
->tcfp_burst
)
299 toks
= police
->tcfp_burst
;
300 toks
-= (s64
) psched_l2t_ns(&police
->rate
, qdisc_pkt_len(skb
));
301 if ((toks
|ptoks
) >= 0) {
302 police
->tcfp_t_c
= now
;
303 police
->tcfp_toks
= toks
;
304 police
->tcfp_ptoks
= ptoks
;
305 spin_unlock(&police
->tcf_lock
);
306 return police
->tcfp_result
;
310 police
->tcf_qstats
.overlimits
++;
311 if (police
->tcf_action
== TC_ACT_SHOT
)
312 police
->tcf_qstats
.drops
++;
313 spin_unlock(&police
->tcf_lock
);
314 return police
->tcf_action
;
318 tcf_act_police_dump(struct sk_buff
*skb
, struct tc_action
*a
, int bind
, int ref
)
320 unsigned char *b
= skb_tail_pointer(skb
);
321 struct tcf_police
*police
= a
->priv
;
322 struct tc_police opt
= {
323 .index
= police
->tcf_index
,
324 .action
= police
->tcf_action
,
325 .mtu
= police
->tcfp_mtu
,
326 .burst
= PSCHED_NS2TICKS(police
->tcfp_burst
),
327 .refcnt
= police
->tcf_refcnt
- ref
,
328 .bindcnt
= police
->tcf_bindcnt
- bind
,
331 if (police
->rate_present
)
332 psched_ratecfg_getrate(&opt
.rate
, &police
->rate
);
333 if (police
->peak_present
)
334 psched_ratecfg_getrate(&opt
.peakrate
, &police
->peak
);
335 if (nla_put(skb
, TCA_POLICE_TBF
, sizeof(opt
), &opt
))
336 goto nla_put_failure
;
337 if (police
->tcfp_result
&&
338 nla_put_u32(skb
, TCA_POLICE_RESULT
, police
->tcfp_result
))
339 goto nla_put_failure
;
340 if (police
->tcfp_ewma_rate
&&
341 nla_put_u32(skb
, TCA_POLICE_AVRATE
, police
->tcfp_ewma_rate
))
342 goto nla_put_failure
;
350 static int tcf_police_search(struct net
*net
, struct tc_action
*a
, u32 index
)
352 struct tc_action_net
*tn
= net_generic(net
, police_net_id
);
354 return tcf_hash_search(tn
, a
, index
);
357 MODULE_AUTHOR("Alexey Kuznetsov");
358 MODULE_DESCRIPTION("Policing actions");
359 MODULE_LICENSE("GPL");
361 static struct tc_action_ops act_police_ops
= {
363 .type
= TCA_ID_POLICE
,
364 .owner
= THIS_MODULE
,
365 .act
= tcf_act_police
,
366 .dump
= tcf_act_police_dump
,
367 .init
= tcf_act_police_locate
,
368 .walk
= tcf_act_police_walker
,
369 .lookup
= tcf_police_search
,
372 static __net_init
int police_init_net(struct net
*net
)
374 struct tc_action_net
*tn
= net_generic(net
, police_net_id
);
376 return tc_action_net_init(tn
, &act_police_ops
, POL_TAB_MASK
);
379 static void __net_exit
police_exit_net(struct net
*net
)
381 struct tc_action_net
*tn
= net_generic(net
, police_net_id
);
383 tc_action_net_exit(tn
);
386 static struct pernet_operations police_net_ops
= {
387 .init
= police_init_net
,
388 .exit
= police_exit_net
,
389 .id
= &police_net_id
,
390 .size
= sizeof(struct tc_action_net
),
394 police_init_module(void)
396 return tcf_register_action(&act_police_ops
, &police_net_ops
);
400 police_cleanup_module(void)
402 tcf_unregister_action(&act_police_ops
, &police_net_ops
);
405 module_init(police_init_module
);
406 module_exit(police_cleanup_module
);