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>
25 #define L2T(p, L) qdisc_l2t((p)->tcfp_R_tab, L)
26 #define L2T_P(p, L) qdisc_l2t((p)->tcfp_P_tab, L)
28 #define POL_TAB_MASK 15
29 static struct tcf_common
*tcf_police_ht
[POL_TAB_MASK
+ 1];
30 static u32 police_idx_gen
;
31 static DEFINE_RWLOCK(police_lock
);
33 static struct tcf_hashinfo police_hash_info
= {
34 .htab
= tcf_police_ht
,
35 .hmask
= POL_TAB_MASK
,
39 /* old policer structure from before tc actions */
40 struct tc_police_compat
{
46 struct tc_ratespec rate
;
47 struct tc_ratespec peakrate
;
50 /* Each policer is serialized by its individual spinlock */
52 static int tcf_act_police_walker(struct sk_buff
*skb
, struct netlink_callback
*cb
,
53 int type
, struct tc_action
*a
)
56 int err
= 0, index
= -1, i
= 0, s_i
= 0, n_i
= 0;
59 read_lock_bh(&police_lock
);
63 for (i
= 0; i
< (POL_TAB_MASK
+ 1); i
++) {
64 p
= tcf_police_ht
[tcf_hash(i
, POL_TAB_MASK
)];
66 for (; p
; p
= p
->tcfc_next
) {
72 nest
= nla_nest_start(skb
, a
->order
);
75 if (type
== RTM_DELACTION
)
76 err
= tcf_action_dump_1(skb
, a
, 0, 1);
78 err
= tcf_action_dump_1(skb
, a
, 0, 0);
81 nla_nest_cancel(skb
, nest
);
84 nla_nest_end(skb
, nest
);
89 read_unlock_bh(&police_lock
);
95 nla_nest_cancel(skb
, nest
);
99 static void tcf_police_destroy(struct tcf_police
*p
)
101 unsigned int h
= tcf_hash(p
->tcf_index
, POL_TAB_MASK
);
102 struct tcf_common
**p1p
;
104 for (p1p
= &tcf_police_ht
[h
]; *p1p
; p1p
= &(*p1p
)->tcfc_next
) {
105 if (*p1p
== &p
->common
) {
106 write_lock_bh(&police_lock
);
108 write_unlock_bh(&police_lock
);
109 gen_kill_estimator(&p
->tcf_bstats
,
112 qdisc_put_rtab(p
->tcfp_R_tab
);
114 qdisc_put_rtab(p
->tcfp_P_tab
);
116 * gen_estimator est_timer() might access p->tcf_lock
117 * or bstats, wait a RCU grace period before freeing p
119 kfree_rcu(p
, tcf_rcu
);
126 static const struct nla_policy police_policy
[TCA_POLICE_MAX
+ 1] = {
127 [TCA_POLICE_RATE
] = { .len
= TC_RTAB_SIZE
},
128 [TCA_POLICE_PEAKRATE
] = { .len
= TC_RTAB_SIZE
},
129 [TCA_POLICE_AVRATE
] = { .type
= NLA_U32
},
130 [TCA_POLICE_RESULT
] = { .type
= NLA_U32
},
133 static int tcf_act_police_locate(struct net
*net
, struct nlattr
*nla
,
134 struct nlattr
*est
, struct tc_action
*a
,
139 struct nlattr
*tb
[TCA_POLICE_MAX
+ 1];
140 struct tc_police
*parm
;
141 struct tcf_police
*police
;
142 struct qdisc_rate_table
*R_tab
= NULL
, *P_tab
= NULL
;
148 err
= nla_parse_nested(tb
, TCA_POLICE_MAX
, nla
, police_policy
);
152 if (tb
[TCA_POLICE_TBF
] == NULL
)
154 size
= nla_len(tb
[TCA_POLICE_TBF
]);
155 if (size
!= sizeof(*parm
) && size
!= sizeof(struct tc_police_compat
))
157 parm
= nla_data(tb
[TCA_POLICE_TBF
]);
160 struct tcf_common
*pc
;
162 pc
= tcf_hash_lookup(parm
->index
, &police_hash_info
);
165 police
= to_police(pc
);
167 police
->tcf_bindcnt
+= 1;
168 police
->tcf_refcnt
+= 1;
176 police
= kzalloc(sizeof(*police
), GFP_KERNEL
);
180 police
->tcf_refcnt
= 1;
181 spin_lock_init(&police
->tcf_lock
);
183 police
->tcf_bindcnt
= 1;
185 if (parm
->rate
.rate
) {
187 R_tab
= qdisc_get_rtab(&parm
->rate
, tb
[TCA_POLICE_RATE
]);
191 if (parm
->peakrate
.rate
) {
192 P_tab
= qdisc_get_rtab(&parm
->peakrate
,
193 tb
[TCA_POLICE_PEAKRATE
]);
199 spin_lock_bh(&police
->tcf_lock
);
201 err
= gen_replace_estimator(&police
->tcf_bstats
,
202 &police
->tcf_rate_est
,
203 &police
->tcf_lock
, est
);
206 } else if (tb
[TCA_POLICE_AVRATE
] &&
207 (ret
== ACT_P_CREATED
||
208 !gen_estimator_active(&police
->tcf_bstats
,
209 &police
->tcf_rate_est
))) {
214 /* No failure allowed after this point */
216 qdisc_put_rtab(police
->tcfp_R_tab
);
217 police
->tcfp_R_tab
= R_tab
;
220 qdisc_put_rtab(police
->tcfp_P_tab
);
221 police
->tcfp_P_tab
= P_tab
;
224 if (tb
[TCA_POLICE_RESULT
])
225 police
->tcfp_result
= nla_get_u32(tb
[TCA_POLICE_RESULT
]);
226 police
->tcfp_toks
= police
->tcfp_burst
= parm
->burst
;
227 police
->tcfp_mtu
= parm
->mtu
;
228 if (police
->tcfp_mtu
== 0) {
229 police
->tcfp_mtu
= ~0;
230 if (police
->tcfp_R_tab
)
231 police
->tcfp_mtu
= 255<<police
->tcfp_R_tab
->rate
.cell_log
;
233 if (police
->tcfp_P_tab
)
234 police
->tcfp_ptoks
= L2T_P(police
, police
->tcfp_mtu
);
235 police
->tcf_action
= parm
->action
;
237 if (tb
[TCA_POLICE_AVRATE
])
238 police
->tcfp_ewma_rate
= nla_get_u32(tb
[TCA_POLICE_AVRATE
]);
240 spin_unlock_bh(&police
->tcf_lock
);
241 if (ret
!= ACT_P_CREATED
)
244 police
->tcfp_t_c
= psched_get_time();
245 police
->tcf_index
= parm
->index
? parm
->index
:
246 tcf_hash_new_index(&police_idx_gen
, &police_hash_info
);
247 h
= tcf_hash(police
->tcf_index
, POL_TAB_MASK
);
248 write_lock_bh(&police_lock
);
249 police
->tcf_next
= tcf_police_ht
[h
];
250 tcf_police_ht
[h
] = &police
->common
;
251 write_unlock_bh(&police_lock
);
257 spin_unlock_bh(&police
->tcf_lock
);
260 qdisc_put_rtab(P_tab
);
262 qdisc_put_rtab(R_tab
);
263 if (ret
== ACT_P_CREATED
)
268 static int tcf_act_police_cleanup(struct tc_action
*a
, int bind
)
270 struct tcf_police
*p
= a
->priv
;
278 if (p
->tcf_refcnt
<= 0 && !p
->tcf_bindcnt
) {
279 tcf_police_destroy(p
);
286 static int tcf_act_police(struct sk_buff
*skb
, const struct tc_action
*a
,
287 struct tcf_result
*res
)
289 struct tcf_police
*police
= a
->priv
;
294 spin_lock(&police
->tcf_lock
);
296 bstats_update(&police
->tcf_bstats
, skb
);
298 if (police
->tcfp_ewma_rate
&&
299 police
->tcf_rate_est
.bps
>= police
->tcfp_ewma_rate
) {
300 police
->tcf_qstats
.overlimits
++;
301 if (police
->tcf_action
== TC_ACT_SHOT
)
302 police
->tcf_qstats
.drops
++;
303 spin_unlock(&police
->tcf_lock
);
304 return police
->tcf_action
;
307 if (qdisc_pkt_len(skb
) <= police
->tcfp_mtu
) {
308 if (police
->tcfp_R_tab
== NULL
) {
309 spin_unlock(&police
->tcf_lock
);
310 return police
->tcfp_result
;
313 now
= psched_get_time();
314 toks
= psched_tdiff_bounded(now
, police
->tcfp_t_c
,
316 if (police
->tcfp_P_tab
) {
317 ptoks
= toks
+ police
->tcfp_ptoks
;
318 if (ptoks
> (long)L2T_P(police
, police
->tcfp_mtu
))
319 ptoks
= (long)L2T_P(police
, police
->tcfp_mtu
);
320 ptoks
-= L2T_P(police
, qdisc_pkt_len(skb
));
322 toks
+= police
->tcfp_toks
;
323 if (toks
> (long)police
->tcfp_burst
)
324 toks
= police
->tcfp_burst
;
325 toks
-= L2T(police
, qdisc_pkt_len(skb
));
326 if ((toks
|ptoks
) >= 0) {
327 police
->tcfp_t_c
= now
;
328 police
->tcfp_toks
= toks
;
329 police
->tcfp_ptoks
= ptoks
;
330 spin_unlock(&police
->tcf_lock
);
331 return police
->tcfp_result
;
335 police
->tcf_qstats
.overlimits
++;
336 if (police
->tcf_action
== TC_ACT_SHOT
)
337 police
->tcf_qstats
.drops
++;
338 spin_unlock(&police
->tcf_lock
);
339 return police
->tcf_action
;
343 tcf_act_police_dump(struct sk_buff
*skb
, struct tc_action
*a
, int bind
, int ref
)
345 unsigned char *b
= skb_tail_pointer(skb
);
346 struct tcf_police
*police
= a
->priv
;
347 struct tc_police opt
= {
348 .index
= police
->tcf_index
,
349 .action
= police
->tcf_action
,
350 .mtu
= police
->tcfp_mtu
,
351 .burst
= police
->tcfp_burst
,
352 .refcnt
= police
->tcf_refcnt
- ref
,
353 .bindcnt
= police
->tcf_bindcnt
- bind
,
356 if (police
->tcfp_R_tab
)
357 opt
.rate
= police
->tcfp_R_tab
->rate
;
358 if (police
->tcfp_P_tab
)
359 opt
.peakrate
= police
->tcfp_P_tab
->rate
;
360 if (nla_put(skb
, TCA_POLICE_TBF
, sizeof(opt
), &opt
))
361 goto nla_put_failure
;
362 if (police
->tcfp_result
&&
363 nla_put_u32(skb
, TCA_POLICE_RESULT
, police
->tcfp_result
))
364 goto nla_put_failure
;
365 if (police
->tcfp_ewma_rate
&&
366 nla_put_u32(skb
, TCA_POLICE_AVRATE
, police
->tcfp_ewma_rate
))
367 goto nla_put_failure
;
375 MODULE_AUTHOR("Alexey Kuznetsov");
376 MODULE_DESCRIPTION("Policing actions");
377 MODULE_LICENSE("GPL");
379 static struct tc_action_ops act_police_ops
= {
381 .hinfo
= &police_hash_info
,
382 .type
= TCA_ID_POLICE
,
383 .capab
= TCA_CAP_NONE
,
384 .owner
= THIS_MODULE
,
385 .act
= tcf_act_police
,
386 .dump
= tcf_act_police_dump
,
387 .cleanup
= tcf_act_police_cleanup
,
388 .lookup
= tcf_hash_search
,
389 .init
= tcf_act_police_locate
,
390 .walk
= tcf_act_police_walker
394 police_init_module(void)
396 return tcf_register_action(&act_police_ops
);
400 police_cleanup_module(void)
402 tcf_unregister_action(&act_police_ops
);
405 module_init(police_init_module
);
406 module_exit(police_cleanup_module
);