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update checkpatch.pl to version 0.05
[pv_ops_mirror.git] / net / sched / act_police.c
blob616f465f407e03d33feaffc17f45a937fb3fcd23
1 /*
2 * net/sched/police.c Input police filter.
3 *
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.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 * J Hadi Salim (action changes)
11 */
12
13 #include <asm/uaccess.h>
14 #include <asm/system.h>
15 #include <linux/bitops.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/mm.h>
21 #include <linux/socket.h>
22 #include <linux/sockios.h>
23 #include <linux/in.h>
24 #include <linux/errno.h>
25 #include <linux/interrupt.h>
26 #include <linux/netdevice.h>
27 #include <linux/skbuff.h>
28 #include <linux/module.h>
29 #include <linux/rtnetlink.h>
30 #include <linux/init.h>
31 #include <net/sock.h>
32 #include <net/act_api.h>
33 #include <net/netlink.h>
34
35 #define L2T(p,L) ((p)->tcfp_R_tab->data[(L)>>(p)->tcfp_R_tab->rate.cell_log])
36 #define L2T_P(p,L) ((p)->tcfp_P_tab->data[(L)>>(p)->tcfp_P_tab->rate.cell_log])
37
38 #define POL_TAB_MASK 15
39 static struct tcf_common *tcf_police_ht[POL_TAB_MASK + 1];
40 static u32 police_idx_gen;
41 static DEFINE_RWLOCK(police_lock);
42
43 static struct tcf_hashinfo police_hash_info = {
44 .htab = tcf_police_ht,
45 .hmask = POL_TAB_MASK,
46 .lock = &police_lock,
47 };
48
49 /* old policer structure from before tc actions */
50 struct tc_police_compat
51 {
52 u32 index;
53 int action;
54 u32 limit;
55 u32 burst;
56 u32 mtu;
57 struct tc_ratespec rate;
58 struct tc_ratespec peakrate;
59 };
60
61 /* Each policer is serialized by its individual spinlock */
62
63 #ifdef CONFIG_NET_CLS_ACT
64 static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *cb,
65 int type, struct tc_action *a)
66 {
67 struct tcf_common *p;
68 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
69 struct rtattr *r;
70
71 read_lock(&police_lock);
72
73 s_i = cb->args[0];
74
75 for (i = 0; i < (POL_TAB_MASK + 1); i++) {
76 p = tcf_police_ht[tcf_hash(i, POL_TAB_MASK)];
77
78 for (; p; p = p->tcfc_next) {
79 index++;
80 if (index < s_i)
81 continue;
82 a->priv = p;
83 a->order = index;
84 r = (struct rtattr *)skb_tail_pointer(skb);
85 RTA_PUT(skb, a->order, 0, NULL);
86 if (type == RTM_DELACTION)
87 err = tcf_action_dump_1(skb, a, 0, 1);
88 else
89 err = tcf_action_dump_1(skb, a, 0, 0);
90 if (err < 0) {
91 index--;
92 nlmsg_trim(skb, r);
93 goto done;
94 }
95 r->rta_len = skb_tail_pointer(skb) - (u8 *)r;
96 n_i++;
97 }
98 }
99 done:
100 read_unlock(&police_lock);
101 if (n_i)
102 cb->args[0] += n_i;
103 return n_i;
104
105 rtattr_failure:
106 nlmsg_trim(skb, r);
107 goto done;
108 }
109 #endif
110
111 void tcf_police_destroy(struct tcf_police *p)
112 {
113 unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
114 struct tcf_common **p1p;
115
116 for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
117 if (*p1p == &p->common) {
118 write_lock_bh(&police_lock);
119 *p1p = p->tcf_next;
120 write_unlock_bh(&police_lock);
121 #ifdef CONFIG_NET_ESTIMATOR
122 gen_kill_estimator(&p->tcf_bstats,
123 &p->tcf_rate_est);
124 #endif
125 if (p->tcfp_R_tab)
126 qdisc_put_rtab(p->tcfp_R_tab);
127 if (p->tcfp_P_tab)
128 qdisc_put_rtab(p->tcfp_P_tab);
129 kfree(p);
130 return;
131 }
132 }
133 BUG_TRAP(0);
134 }
135
136 #ifdef CONFIG_NET_CLS_ACT
137 static int tcf_act_police_locate(struct rtattr *rta, struct rtattr *est,
138 struct tc_action *a, int ovr, int bind)
139 {
140 unsigned h;
141 int ret = 0, err;
142 struct rtattr *tb[TCA_POLICE_MAX];
143 struct tc_police *parm;
144 struct tcf_police *police;
145 struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
146 int size;
147
148 if (rta == NULL || rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
149 return -EINVAL;
150
151 if (tb[TCA_POLICE_TBF-1] == NULL)
152 return -EINVAL;
153 size = RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]);
154 if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
155 return -EINVAL;
156 parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
157
158 if (tb[TCA_POLICE_RESULT-1] != NULL &&
159 RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
160 return -EINVAL;
161 if (tb[TCA_POLICE_RESULT-1] != NULL &&
162 RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
163 return -EINVAL;
164
165 if (parm->index) {
166 struct tcf_common *pc;
167
168 pc = tcf_hash_lookup(parm->index, &police_hash_info);
169 if (pc != NULL) {
170 a->priv = pc;
171 police = to_police(pc);
172 if (bind) {
173 police->tcf_bindcnt += 1;
174 police->tcf_refcnt += 1;
175 }
176 if (ovr)
177 goto override;
178 return ret;
179 }
180 }
181
182 police = kzalloc(sizeof(*police), GFP_KERNEL);
183 if (police == NULL)
184 return -ENOMEM;
185 ret = ACT_P_CREATED;
186 police->tcf_refcnt = 1;
187 spin_lock_init(&police->tcf_lock);
188 police->tcf_stats_lock = &police->tcf_lock;
189 if (bind)
190 police->tcf_bindcnt = 1;
191 override:
192 if (parm->rate.rate) {
193 err = -ENOMEM;
194 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
195 if (R_tab == NULL)
196 goto failure;
197 if (parm->peakrate.rate) {
198 P_tab = qdisc_get_rtab(&parm->peakrate,
199 tb[TCA_POLICE_PEAKRATE-1]);
200 if (P_tab == NULL) {
201 qdisc_put_rtab(R_tab);
202 goto failure;
203 }
204 }
205 }
206 /* No failure allowed after this point */
207 spin_lock_bh(&police->tcf_lock);
208 if (R_tab != NULL) {
209 qdisc_put_rtab(police->tcfp_R_tab);
210 police->tcfp_R_tab = R_tab;
211 }
212 if (P_tab != NULL) {
213 qdisc_put_rtab(police->tcfp_P_tab);
214 police->tcfp_P_tab = P_tab;
215 }
216
217 if (tb[TCA_POLICE_RESULT-1])
218 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
219 police->tcfp_toks = police->tcfp_burst = parm->burst;
220 police->tcfp_mtu = parm->mtu;
221 if (police->tcfp_mtu == 0) {
222 police->tcfp_mtu = ~0;
223 if (police->tcfp_R_tab)
224 police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
225 }
226 if (police->tcfp_P_tab)
227 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
228 police->tcf_action = parm->action;
229
230 #ifdef CONFIG_NET_ESTIMATOR
231 if (tb[TCA_POLICE_AVRATE-1])
232 police->tcfp_ewma_rate =
233 *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
234 if (est)
235 gen_replace_estimator(&police->tcf_bstats,
236 &police->tcf_rate_est,
237 police->tcf_stats_lock, est);
238 #endif
239
240 spin_unlock_bh(&police->tcf_lock);
241 if (ret != ACT_P_CREATED)
242 return ret;
243
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);
252
253 a->priv = police;
254 return ret;
255
256 failure:
257 if (ret == ACT_P_CREATED)
258 kfree(police);
259 return err;
260 }
261
262 static int tcf_act_police_cleanup(struct tc_action *a, int bind)
263 {
264 struct tcf_police *p = a->priv;
265
266 if (p != NULL)
267 return tcf_police_release(p, bind);
268 return 0;
269 }
270
271 static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
272 struct tcf_result *res)
273 {
274 struct tcf_police *police = a->priv;
275 psched_time_t now;
276 long toks;
277 long ptoks = 0;
278
279 spin_lock(&police->tcf_lock);
280
281 police->tcf_bstats.bytes += skb->len;
282 police->tcf_bstats.packets++;
283
284 #ifdef CONFIG_NET_ESTIMATOR
285 if (police->tcfp_ewma_rate &&
286 police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
287 police->tcf_qstats.overlimits++;
288 spin_unlock(&police->tcf_lock);
289 return police->tcf_action;
290 }
291 #endif
292
293 if (skb->len <= police->tcfp_mtu) {
294 if (police->tcfp_R_tab == NULL) {
295 spin_unlock(&police->tcf_lock);
296 return police->tcfp_result;
297 }
298
299 now = psched_get_time();
300 toks = psched_tdiff_bounded(now, police->tcfp_t_c,
301 police->tcfp_burst);
302 if (police->tcfp_P_tab) {
303 ptoks = toks + police->tcfp_ptoks;
304 if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
305 ptoks = (long)L2T_P(police, police->tcfp_mtu);
306 ptoks -= L2T_P(police, skb->len);
307 }
308 toks += police->tcfp_toks;
309 if (toks > (long)police->tcfp_burst)
310 toks = police->tcfp_burst;
311 toks -= L2T(police, skb->len);
312 if ((toks|ptoks) >= 0) {
313 police->tcfp_t_c = now;
314 police->tcfp_toks = toks;
315 police->tcfp_ptoks = ptoks;
316 spin_unlock(&police->tcf_lock);
317 return police->tcfp_result;
318 }
319 }
320
321 police->tcf_qstats.overlimits++;
322 spin_unlock(&police->tcf_lock);
323 return police->tcf_action;
324 }
325
326 static int
327 tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
328 {
329 unsigned char *b = skb_tail_pointer(skb);
330 struct tcf_police *police = a->priv;
331 struct tc_police opt;
332
333 opt.index = police->tcf_index;
334 opt.action = police->tcf_action;
335 opt.mtu = police->tcfp_mtu;
336 opt.burst = police->tcfp_burst;
337 opt.refcnt = police->tcf_refcnt - ref;
338 opt.bindcnt = police->tcf_bindcnt - bind;
339 if (police->tcfp_R_tab)
340 opt.rate = police->tcfp_R_tab->rate;
341 else
342 memset(&opt.rate, 0, sizeof(opt.rate));
343 if (police->tcfp_P_tab)
344 opt.peakrate = police->tcfp_P_tab->rate;
345 else
346 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
347 RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
348 if (police->tcfp_result)
349 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
350 &police->tcfp_result);
351 #ifdef CONFIG_NET_ESTIMATOR
352 if (police->tcfp_ewma_rate)
353 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
354 #endif
355 return skb->len;
356
357 rtattr_failure:
358 nlmsg_trim(skb, b);
359 return -1;
360 }
361
362 MODULE_AUTHOR("Alexey Kuznetsov");
363 MODULE_DESCRIPTION("Policing actions");
364 MODULE_LICENSE("GPL");
365
366 static struct tc_action_ops act_police_ops = {
367 .kind = "police",
368 .hinfo = &police_hash_info,
369 .type = TCA_ID_POLICE,
370 .capab = TCA_CAP_NONE,
371 .owner = THIS_MODULE,
372 .act = tcf_act_police,
373 .dump = tcf_act_police_dump,
374 .cleanup = tcf_act_police_cleanup,
375 .lookup = tcf_hash_search,
376 .init = tcf_act_police_locate,
377 .walk = tcf_act_police_walker
378 };
379
380 static int __init
381 police_init_module(void)
382 {
383 return tcf_register_action(&act_police_ops);
384 }
385
386 static void __exit
387 police_cleanup_module(void)
388 {
389 tcf_unregister_action(&act_police_ops);
390 }
391
392 module_init(police_init_module);
393 module_exit(police_cleanup_module);
394
395 #else /* CONFIG_NET_CLS_ACT */
396
397 static struct tcf_common *tcf_police_lookup(u32 index)
398 {
399 struct tcf_hashinfo *hinfo = &police_hash_info;
400 struct tcf_common *p;
401
402 read_lock(hinfo->lock);
403 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
404 p = p->tcfc_next) {
405 if (p->tcfc_index == index)
406 break;
407 }
408 read_unlock(hinfo->lock);
409
410 return p;
411 }
412
413 static u32 tcf_police_new_index(void)
414 {
415 u32 *idx_gen = &police_idx_gen;
416 u32 val = *idx_gen;
417
418 do {
419 if (++val == 0)
420 val = 1;
421 } while (tcf_police_lookup(val));
422
423 return (*idx_gen = val);
424 }
425
426 struct tcf_police *tcf_police_locate(struct rtattr *rta, struct rtattr *est)
427 {
428 unsigned int h;
429 struct tcf_police *police;
430 struct rtattr *tb[TCA_POLICE_MAX];
431 struct tc_police *parm;
432 int size;
433
434 if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
435 return NULL;
436
437 if (tb[TCA_POLICE_TBF-1] == NULL)
438 return NULL;
439 size = RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]);
440 if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
441 return NULL;
442
443 parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
444
445 if (parm->index) {
446 struct tcf_common *pc;
447
448 pc = tcf_police_lookup(parm->index);
449 if (pc) {
450 police = to_police(pc);
451 police->tcf_refcnt++;
452 return police;
453 }
454 }
455 police = kzalloc(sizeof(*police), GFP_KERNEL);
456 if (unlikely(!police))
457 return NULL;
458
459 police->tcf_refcnt = 1;
460 spin_lock_init(&police->tcf_lock);
461 police->tcf_stats_lock = &police->tcf_lock;
462 if (parm->rate.rate) {
463 police->tcfp_R_tab =
464 qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
465 if (police->tcfp_R_tab == NULL)
466 goto failure;
467 if (parm->peakrate.rate) {
468 police->tcfp_P_tab =
469 qdisc_get_rtab(&parm->peakrate,
470 tb[TCA_POLICE_PEAKRATE-1]);
471 if (police->tcfp_P_tab == NULL)
472 goto failure;
473 }
474 }
475 if (tb[TCA_POLICE_RESULT-1]) {
476 if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
477 goto failure;
478 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
479 }
480 #ifdef CONFIG_NET_ESTIMATOR
481 if (tb[TCA_POLICE_AVRATE-1]) {
482 if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
483 goto failure;
484 police->tcfp_ewma_rate =
485 *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
486 }
487 #endif
488 police->tcfp_toks = police->tcfp_burst = parm->burst;
489 police->tcfp_mtu = parm->mtu;
490 if (police->tcfp_mtu == 0) {
491 police->tcfp_mtu = ~0;
492 if (police->tcfp_R_tab)
493 police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
494 }
495 if (police->tcfp_P_tab)
496 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
497 police->tcfp_t_c = psched_get_time();
498 police->tcf_index = parm->index ? parm->index :
499 tcf_police_new_index();
500 police->tcf_action = parm->action;
501 #ifdef CONFIG_NET_ESTIMATOR
502 if (est)
503 gen_new_estimator(&police->tcf_bstats, &police->tcf_rate_est,
504 police->tcf_stats_lock, est);
505 #endif
506 h = tcf_hash(police->tcf_index, POL_TAB_MASK);
507 write_lock_bh(&police_lock);
508 police->tcf_next = tcf_police_ht[h];
509 tcf_police_ht[h] = &police->common;
510 write_unlock_bh(&police_lock);
511 return police;
512
513 failure:
514 if (police->tcfp_R_tab)
515 qdisc_put_rtab(police->tcfp_R_tab);
516 kfree(police);
517 return NULL;
518 }
519
520 int tcf_police(struct sk_buff *skb, struct tcf_police *police)
521 {
522 psched_time_t now;
523 long toks;
524 long ptoks = 0;
525
526 spin_lock(&police->tcf_lock);
527
528 police->tcf_bstats.bytes += skb->len;
529 police->tcf_bstats.packets++;
530
531 #ifdef CONFIG_NET_ESTIMATOR
532 if (police->tcfp_ewma_rate &&
533 police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
534 police->tcf_qstats.overlimits++;
535 spin_unlock(&police->tcf_lock);
536 return police->tcf_action;
537 }
538 #endif
539 if (skb->len <= police->tcfp_mtu) {
540 if (police->tcfp_R_tab == NULL) {
541 spin_unlock(&police->tcf_lock);
542 return police->tcfp_result;
543 }
544
545 now = psched_get_time();
546 toks = psched_tdiff_bounded(now, police->tcfp_t_c,
547 police->tcfp_burst);
548 if (police->tcfp_P_tab) {
549 ptoks = toks + police->tcfp_ptoks;
550 if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
551 ptoks = (long)L2T_P(police, police->tcfp_mtu);
552 ptoks -= L2T_P(police, skb->len);
553 }
554 toks += police->tcfp_toks;
555 if (toks > (long)police->tcfp_burst)
556 toks = police->tcfp_burst;
557 toks -= L2T(police, skb->len);
558 if ((toks|ptoks) >= 0) {
559 police->tcfp_t_c = now;
560 police->tcfp_toks = toks;
561 police->tcfp_ptoks = ptoks;
562 spin_unlock(&police->tcf_lock);
563 return police->tcfp_result;
564 }
565 }
566
567 police->tcf_qstats.overlimits++;
568 spin_unlock(&police->tcf_lock);
569 return police->tcf_action;
570 }
571 EXPORT_SYMBOL(tcf_police);
572
573 int tcf_police_dump(struct sk_buff *skb, struct tcf_police *police)
574 {
575 unsigned char *b = skb_tail_pointer(skb);
576 struct tc_police opt;
577
578 opt.index = police->tcf_index;
579 opt.action = police->tcf_action;
580 opt.mtu = police->tcfp_mtu;
581 opt.burst = police->tcfp_burst;
582 if (police->tcfp_R_tab)
583 opt.rate = police->tcfp_R_tab->rate;
584 else
585 memset(&opt.rate, 0, sizeof(opt.rate));
586 if (police->tcfp_P_tab)
587 opt.peakrate = police->tcfp_P_tab->rate;
588 else
589 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
590 RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
591 if (police->tcfp_result)
592 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
593 &police->tcfp_result);
594 #ifdef CONFIG_NET_ESTIMATOR
595 if (police->tcfp_ewma_rate)
596 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
597 #endif
598 return skb->len;
599
600 rtattr_failure:
601 nlmsg_trim(skb, b);
602 return -1;
603 }
604
605 int tcf_police_dump_stats(struct sk_buff *skb, struct tcf_police *police)
606 {
607 struct gnet_dump d;
608
609 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
610 TCA_XSTATS, police->tcf_stats_lock,
611 &d) < 0)
612 goto errout;
613
614 if (gnet_stats_copy_basic(&d, &police->tcf_bstats) < 0 ||
615 #ifdef CONFIG_NET_ESTIMATOR
616 gnet_stats_copy_rate_est(&d, &police->tcf_rate_est) < 0 ||
617 #endif
618 gnet_stats_copy_queue(&d, &police->tcf_qstats) < 0)
619 goto errout;
620
621 if (gnet_stats_finish_copy(&d) < 0)
622 goto errout;
623
624 return 0;
625
626 errout:
627 return -1;
628 }
629
630 #endif /* CONFIG_NET_CLS_ACT */
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