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K2.6 patches and update.
[tomato.git] / release / src-rt / linux / linux-2.6 / net / sched / act_police.c
blob4ebc00aa849e0494758297e71fc8f242ba6f6643
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) qdisc_l2t((p)->tcfp_R_tab,L)
36 #define L2T_P(p,L) qdisc_l2t((p)->tcfp_P_tab,L)
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_bh(&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_bh(&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 .index = police->tcf_index,
333 .action = police->tcf_action,
334 .mtu = police->tcfp_mtu,
335 .burst = police->tcfp_burst,
336 .refcnt = police->tcf_refcnt - ref,
337 .bindcnt = police->tcf_bindcnt - bind,
338 };
339
340 if (police->tcfp_R_tab)
341 opt.rate = police->tcfp_R_tab->rate;
342 if (police->tcfp_P_tab)
343 opt.peakrate = police->tcfp_P_tab->rate;
344 RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
345 if (police->tcfp_result)
346 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
347 &police->tcfp_result);
348 #ifdef CONFIG_NET_ESTIMATOR
349 if (police->tcfp_ewma_rate)
350 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
351 #endif
352 return skb->len;
353
354 rtattr_failure:
355 nlmsg_trim(skb, b);
356 return -1;
357 }
358
359 MODULE_AUTHOR("Alexey Kuznetsov");
360 MODULE_DESCRIPTION("Policing actions");
361 MODULE_LICENSE("GPL");
362
363 static struct tc_action_ops act_police_ops = {
364 .kind = "police",
365 .hinfo = &police_hash_info,
366 .type = TCA_ID_POLICE,
367 .capab = TCA_CAP_NONE,
368 .owner = THIS_MODULE,
369 .act = tcf_act_police,
370 .dump = tcf_act_police_dump,
371 .cleanup = tcf_act_police_cleanup,
372 .lookup = tcf_hash_search,
373 .init = tcf_act_police_locate,
374 .walk = tcf_act_police_walker
375 };
376
377 static int __init
378 police_init_module(void)
379 {
380 return tcf_register_action(&act_police_ops);
381 }
382
383 static void __exit
384 police_cleanup_module(void)
385 {
386 tcf_unregister_action(&act_police_ops);
387 }
388
389 module_init(police_init_module);
390 module_exit(police_cleanup_module);
391
392 #else /* CONFIG_NET_CLS_ACT */
393
394 static struct tcf_common *tcf_police_lookup(u32 index)
395 {
396 struct tcf_hashinfo *hinfo = &police_hash_info;
397 struct tcf_common *p;
398
399 read_lock(hinfo->lock);
400 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
401 p = p->tcfc_next) {
402 if (p->tcfc_index == index)
403 break;
404 }
405 read_unlock(hinfo->lock);
406
407 return p;
408 }
409
410 static u32 tcf_police_new_index(void)
411 {
412 u32 *idx_gen = &police_idx_gen;
413 u32 val = *idx_gen;
414
415 do {
416 if (++val == 0)
417 val = 1;
418 } while (tcf_police_lookup(val));
419
420 return (*idx_gen = val);
421 }
422
423 struct tcf_police *tcf_police_locate(struct rtattr *rta, struct rtattr *est)
424 {
425 unsigned int h;
426 struct tcf_police *police;
427 struct rtattr *tb[TCA_POLICE_MAX];
428 struct tc_police *parm;
429 int size;
430
431 if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
432 return NULL;
433
434 if (tb[TCA_POLICE_TBF-1] == NULL)
435 return NULL;
436 size = RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]);
437 if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
438 return NULL;
439
440 parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
441
442 if (parm->index) {
443 struct tcf_common *pc;
444
445 pc = tcf_police_lookup(parm->index);
446 if (pc) {
447 police = to_police(pc);
448 police->tcf_refcnt++;
449 return police;
450 }
451 }
452 police = kzalloc(sizeof(*police), GFP_KERNEL);
453 if (unlikely(!police))
454 return NULL;
455
456 police->tcf_refcnt = 1;
457 spin_lock_init(&police->tcf_lock);
458 police->tcf_stats_lock = &police->tcf_lock;
459 if (parm->rate.rate) {
460 police->tcfp_R_tab =
461 qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
462 if (police->tcfp_R_tab == NULL)
463 goto failure;
464 if (parm->peakrate.rate) {
465 police->tcfp_P_tab =
466 qdisc_get_rtab(&parm->peakrate,
467 tb[TCA_POLICE_PEAKRATE-1]);
468 if (police->tcfp_P_tab == NULL)
469 goto failure;
470 }
471 }
472 if (tb[TCA_POLICE_RESULT-1]) {
473 if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
474 goto failure;
475 police->tcfp_result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
476 }
477 #ifdef CONFIG_NET_ESTIMATOR
478 if (tb[TCA_POLICE_AVRATE-1]) {
479 if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
480 goto failure;
481 police->tcfp_ewma_rate =
482 *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
483 }
484 #endif
485 police->tcfp_toks = police->tcfp_burst = parm->burst;
486 police->tcfp_mtu = parm->mtu;
487 if (police->tcfp_mtu == 0) {
488 police->tcfp_mtu = ~0;
489 if (police->tcfp_R_tab)
490 police->tcfp_mtu = 255<<police->tcfp_R_tab->rate.cell_log;
491 }
492 if (police->tcfp_P_tab)
493 police->tcfp_ptoks = L2T_P(police, police->tcfp_mtu);
494 police->tcfp_t_c = psched_get_time();
495 police->tcf_index = parm->index ? parm->index :
496 tcf_police_new_index();
497 police->tcf_action = parm->action;
498 #ifdef CONFIG_NET_ESTIMATOR
499 if (est)
500 gen_new_estimator(&police->tcf_bstats, &police->tcf_rate_est,
501 police->tcf_stats_lock, est);
502 #endif
503 h = tcf_hash(police->tcf_index, POL_TAB_MASK);
504 write_lock_bh(&police_lock);
505 police->tcf_next = tcf_police_ht[h];
506 tcf_police_ht[h] = &police->common;
507 write_unlock_bh(&police_lock);
508 return police;
509
510 failure:
511 if (police->tcfp_R_tab)
512 qdisc_put_rtab(police->tcfp_R_tab);
513 kfree(police);
514 return NULL;
515 }
516
517 int tcf_police(struct sk_buff *skb, struct tcf_police *police)
518 {
519 psched_time_t now;
520 long toks;
521 long ptoks = 0;
522
523 spin_lock(&police->tcf_lock);
524
525 police->tcf_bstats.bytes += skb->len;
526 police->tcf_bstats.packets++;
527
528 #ifdef CONFIG_NET_ESTIMATOR
529 if (police->tcfp_ewma_rate &&
530 police->tcf_rate_est.bps >= police->tcfp_ewma_rate) {
531 police->tcf_qstats.overlimits++;
532 spin_unlock(&police->tcf_lock);
533 return police->tcf_action;
534 }
535 #endif
536 if (skb->len <= police->tcfp_mtu) {
537 if (police->tcfp_R_tab == NULL) {
538 spin_unlock(&police->tcf_lock);
539 return police->tcfp_result;
540 }
541
542 now = psched_get_time();
543 toks = psched_tdiff_bounded(now, police->tcfp_t_c,
544 police->tcfp_burst);
545 if (police->tcfp_P_tab) {
546 ptoks = toks + police->tcfp_ptoks;
547 if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
548 ptoks = (long)L2T_P(police, police->tcfp_mtu);
549 ptoks -= L2T_P(police, skb->len);
550 }
551 toks += police->tcfp_toks;
552 if (toks > (long)police->tcfp_burst)
553 toks = police->tcfp_burst;
554 toks -= L2T(police, skb->len);
555 if ((toks|ptoks) >= 0) {
556 police->tcfp_t_c = now;
557 police->tcfp_toks = toks;
558 police->tcfp_ptoks = ptoks;
559 spin_unlock(&police->tcf_lock);
560 return police->tcfp_result;
561 }
562 }
563
564 police->tcf_qstats.overlimits++;
565 spin_unlock(&police->tcf_lock);
566 return police->tcf_action;
567 }
568 EXPORT_SYMBOL(tcf_police);
569
570 int tcf_police_dump(struct sk_buff *skb, struct tcf_police *police)
571 {
572 unsigned char *b = skb_tail_pointer(skb);
573 struct tc_police opt = {
574 .index = police->tcf_index,
575 .action = police->tcf_action,
576 .mtu = police->tcfp_mtu,
577 .burst = police->tcfp_burst,
578 };
579
580 if (police->tcfp_R_tab)
581 opt.rate = police->tcfp_R_tab->rate;
582 else
583 memset(&opt.rate, 0, sizeof(opt.rate));
584 if (police->tcfp_P_tab)
585 opt.peakrate = police->tcfp_P_tab->rate;
586 else
587 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
588 RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
589 if (police->tcfp_result)
590 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int),
591 &police->tcfp_result);
592 #ifdef CONFIG_NET_ESTIMATOR
593 if (police->tcfp_ewma_rate)
594 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &police->tcfp_ewma_rate);
595 #endif
596 return skb->len;
597
598 rtattr_failure:
599 nlmsg_trim(skb, b);
600 return -1;
601 }
602
603 int tcf_police_dump_stats(struct sk_buff *skb, struct tcf_police *police)
604 {
605 struct gnet_dump d;
606
607 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
608 TCA_XSTATS, police->tcf_stats_lock,
609 &d) < 0)
610 goto errout;
611
612 if (gnet_stats_copy_basic(&d, &police->tcf_bstats) < 0 ||
613 #ifdef CONFIG_NET_ESTIMATOR
614 gnet_stats_copy_rate_est(&d, &police->tcf_rate_est) < 0 ||
615 #endif
616 gnet_stats_copy_queue(&d, &police->tcf_qstats) < 0)
617 goto errout;
618
619 if (gnet_stats_finish_copy(&d) < 0)
620 goto errout;
621
622 return 0;
623
624 errout:
625 return -1;
626 }
627
628 #endif /* CONFIG_NET_CLS_ACT */
Tomato firmware and modifications.