[MIPS] Delete duplicate definitions of break codes.
[linux-2.6/mini2440.git] / net / sched / police.c
blobeb39fb2f39b6da90c76a24698289212864dfb354
1 /*
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 <asm/uaccess.h>
14 #include <asm/system.h>
15 #include <linux/bitops.h>
16 #include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/string.h>
22 #include <linux/mm.h>
23 #include <linux/socket.h>
24 #include <linux/sockios.h>
25 #include <linux/in.h>
26 #include <linux/errno.h>
27 #include <linux/interrupt.h>
28 #include <linux/netdevice.h>
29 #include <linux/skbuff.h>
30 #include <linux/module.h>
31 #include <linux/rtnetlink.h>
32 #include <linux/init.h>
33 #include <net/sock.h>
34 #include <net/act_api.h>
36 #define L2T(p,L) ((p)->R_tab->data[(L)>>(p)->R_tab->rate.cell_log])
37 #define L2T_P(p,L) ((p)->P_tab->data[(L)>>(p)->P_tab->rate.cell_log])
38 #define PRIV(a) ((struct tcf_police *) (a)->priv)
40 /* use generic hash table */
41 #define MY_TAB_SIZE 16
42 #define MY_TAB_MASK 15
43 static u32 idx_gen;
44 static struct tcf_police *tcf_police_ht[MY_TAB_SIZE];
45 /* Policer hash table lock */
46 static DEFINE_RWLOCK(police_lock);
48 /* Each policer is serialized by its individual spinlock */
50 static __inline__ unsigned tcf_police_hash(u32 index)
52 return index&0xF;
55 static __inline__ struct tcf_police * tcf_police_lookup(u32 index)
57 struct tcf_police *p;
59 read_lock(&police_lock);
60 for (p = tcf_police_ht[tcf_police_hash(index)]; p; p = p->next) {
61 if (p->index == index)
62 break;
64 read_unlock(&police_lock);
65 return p;
68 #ifdef CONFIG_NET_CLS_ACT
69 static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
70 int type, struct tc_action *a)
72 struct tcf_police *p;
73 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
74 struct rtattr *r;
76 read_lock(&police_lock);
78 s_i = cb->args[0];
80 for (i = 0; i < MY_TAB_SIZE; i++) {
81 p = tcf_police_ht[tcf_police_hash(i)];
83 for (; p; p = p->next) {
84 index++;
85 if (index < s_i)
86 continue;
87 a->priv = p;
88 a->order = index;
89 r = (struct rtattr*) skb->tail;
90 RTA_PUT(skb, a->order, 0, NULL);
91 if (type == RTM_DELACTION)
92 err = tcf_action_dump_1(skb, a, 0, 1);
93 else
94 err = tcf_action_dump_1(skb, a, 0, 0);
95 if (err < 0) {
96 index--;
97 skb_trim(skb, (u8*)r - skb->data);
98 goto done;
100 r->rta_len = skb->tail - (u8*)r;
101 n_i++;
104 done:
105 read_unlock(&police_lock);
106 if (n_i)
107 cb->args[0] += n_i;
108 return n_i;
110 rtattr_failure:
111 skb_trim(skb, (u8*)r - skb->data);
112 goto done;
115 static inline int
116 tcf_hash_search(struct tc_action *a, u32 index)
118 struct tcf_police *p = tcf_police_lookup(index);
120 if (p != NULL) {
121 a->priv = p;
122 return 1;
123 } else {
124 return 0;
127 #endif
129 static inline u32 tcf_police_new_index(void)
131 do {
132 if (++idx_gen == 0)
133 idx_gen = 1;
134 } while (tcf_police_lookup(idx_gen));
136 return idx_gen;
139 void tcf_police_destroy(struct tcf_police *p)
141 unsigned h = tcf_police_hash(p->index);
142 struct tcf_police **p1p;
144 for (p1p = &tcf_police_ht[h]; *p1p; p1p = &(*p1p)->next) {
145 if (*p1p == p) {
146 write_lock_bh(&police_lock);
147 *p1p = p->next;
148 write_unlock_bh(&police_lock);
149 #ifdef CONFIG_NET_ESTIMATOR
150 gen_kill_estimator(&p->bstats, &p->rate_est);
151 #endif
152 if (p->R_tab)
153 qdisc_put_rtab(p->R_tab);
154 if (p->P_tab)
155 qdisc_put_rtab(p->P_tab);
156 kfree(p);
157 return;
160 BUG_TRAP(0);
163 #ifdef CONFIG_NET_CLS_ACT
164 static int tcf_act_police_locate(struct rtattr *rta, struct rtattr *est,
165 struct tc_action *a, int ovr, int bind)
167 unsigned h;
168 int ret = 0, err;
169 struct rtattr *tb[TCA_POLICE_MAX];
170 struct tc_police *parm;
171 struct tcf_police *p;
172 struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
174 if (rta == NULL || rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
175 return -EINVAL;
177 if (tb[TCA_POLICE_TBF-1] == NULL ||
178 RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
179 return -EINVAL;
180 parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
182 if (tb[TCA_POLICE_RESULT-1] != NULL &&
183 RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
184 return -EINVAL;
185 if (tb[TCA_POLICE_RESULT-1] != NULL &&
186 RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
187 return -EINVAL;
189 if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
190 a->priv = p;
191 if (bind) {
192 p->bindcnt += 1;
193 p->refcnt += 1;
195 if (ovr)
196 goto override;
197 return ret;
200 p = kmalloc(sizeof(*p), GFP_KERNEL);
201 if (p == NULL)
202 return -ENOMEM;
203 memset(p, 0, sizeof(*p));
205 ret = ACT_P_CREATED;
206 p->refcnt = 1;
207 spin_lock_init(&p->lock);
208 p->stats_lock = &p->lock;
209 if (bind)
210 p->bindcnt = 1;
211 override:
212 if (parm->rate.rate) {
213 err = -ENOMEM;
214 R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
215 if (R_tab == NULL)
216 goto failure;
217 if (parm->peakrate.rate) {
218 P_tab = qdisc_get_rtab(&parm->peakrate,
219 tb[TCA_POLICE_PEAKRATE-1]);
220 if (p->P_tab == NULL) {
221 qdisc_put_rtab(R_tab);
222 goto failure;
226 /* No failure allowed after this point */
227 spin_lock_bh(&p->lock);
228 if (R_tab != NULL) {
229 qdisc_put_rtab(p->R_tab);
230 p->R_tab = R_tab;
232 if (P_tab != NULL) {
233 qdisc_put_rtab(p->P_tab);
234 p->P_tab = P_tab;
237 if (tb[TCA_POLICE_RESULT-1])
238 p->result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
239 p->toks = p->burst = parm->burst;
240 p->mtu = parm->mtu;
241 if (p->mtu == 0) {
242 p->mtu = ~0;
243 if (p->R_tab)
244 p->mtu = 255<<p->R_tab->rate.cell_log;
246 if (p->P_tab)
247 p->ptoks = L2T_P(p, p->mtu);
248 p->action = parm->action;
250 #ifdef CONFIG_NET_ESTIMATOR
251 if (tb[TCA_POLICE_AVRATE-1])
252 p->ewma_rate = *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
253 if (est)
254 gen_replace_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
255 #endif
257 spin_unlock_bh(&p->lock);
258 if (ret != ACT_P_CREATED)
259 return ret;
261 PSCHED_GET_TIME(p->t_c);
262 p->index = parm->index ? : tcf_police_new_index();
263 h = tcf_police_hash(p->index);
264 write_lock_bh(&police_lock);
265 p->next = tcf_police_ht[h];
266 tcf_police_ht[h] = p;
267 write_unlock_bh(&police_lock);
269 a->priv = p;
270 return ret;
272 failure:
273 if (ret == ACT_P_CREATED)
274 kfree(p);
275 return err;
278 static int tcf_act_police_cleanup(struct tc_action *a, int bind)
280 struct tcf_police *p = PRIV(a);
282 if (p != NULL)
283 return tcf_police_release(p, bind);
284 return 0;
287 static int tcf_act_police(struct sk_buff **pskb, struct tc_action *a,
288 struct tcf_result *res)
290 psched_time_t now;
291 struct sk_buff *skb = *pskb;
292 struct tcf_police *p = PRIV(a);
293 long toks;
294 long ptoks = 0;
296 spin_lock(&p->lock);
298 p->bstats.bytes += skb->len;
299 p->bstats.packets++;
301 #ifdef CONFIG_NET_ESTIMATOR
302 if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
303 p->qstats.overlimits++;
304 spin_unlock(&p->lock);
305 return p->action;
307 #endif
309 if (skb->len <= p->mtu) {
310 if (p->R_tab == NULL) {
311 spin_unlock(&p->lock);
312 return p->result;
315 PSCHED_GET_TIME(now);
317 toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);
319 if (p->P_tab) {
320 ptoks = toks + p->ptoks;
321 if (ptoks > (long)L2T_P(p, p->mtu))
322 ptoks = (long)L2T_P(p, p->mtu);
323 ptoks -= L2T_P(p, skb->len);
325 toks += p->toks;
326 if (toks > (long)p->burst)
327 toks = p->burst;
328 toks -= L2T(p, skb->len);
330 if ((toks|ptoks) >= 0) {
331 p->t_c = now;
332 p->toks = toks;
333 p->ptoks = ptoks;
334 spin_unlock(&p->lock);
335 return p->result;
339 p->qstats.overlimits++;
340 spin_unlock(&p->lock);
341 return p->action;
344 static int
345 tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
347 unsigned char *b = skb->tail;
348 struct tc_police opt;
349 struct tcf_police *p = PRIV(a);
351 opt.index = p->index;
352 opt.action = p->action;
353 opt.mtu = p->mtu;
354 opt.burst = p->burst;
355 opt.refcnt = p->refcnt - ref;
356 opt.bindcnt = p->bindcnt - bind;
357 if (p->R_tab)
358 opt.rate = p->R_tab->rate;
359 else
360 memset(&opt.rate, 0, sizeof(opt.rate));
361 if (p->P_tab)
362 opt.peakrate = p->P_tab->rate;
363 else
364 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
365 RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
366 if (p->result)
367 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), &p->result);
368 #ifdef CONFIG_NET_ESTIMATOR
369 if (p->ewma_rate)
370 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &p->ewma_rate);
371 #endif
372 return skb->len;
374 rtattr_failure:
375 skb_trim(skb, b - skb->data);
376 return -1;
379 MODULE_AUTHOR("Alexey Kuznetsov");
380 MODULE_DESCRIPTION("Policing actions");
381 MODULE_LICENSE("GPL");
383 static struct tc_action_ops act_police_ops = {
384 .kind = "police",
385 .type = TCA_ID_POLICE,
386 .capab = TCA_CAP_NONE,
387 .owner = THIS_MODULE,
388 .act = tcf_act_police,
389 .dump = tcf_act_police_dump,
390 .cleanup = tcf_act_police_cleanup,
391 .lookup = tcf_hash_search,
392 .init = tcf_act_police_locate,
393 .walk = tcf_generic_walker
396 static int __init
397 police_init_module(void)
399 return tcf_register_action(&act_police_ops);
402 static void __exit
403 police_cleanup_module(void)
405 tcf_unregister_action(&act_police_ops);
408 module_init(police_init_module);
409 module_exit(police_cleanup_module);
411 #endif
413 struct tcf_police * tcf_police_locate(struct rtattr *rta, struct rtattr *est)
415 unsigned h;
416 struct tcf_police *p;
417 struct rtattr *tb[TCA_POLICE_MAX];
418 struct tc_police *parm;
420 if (rtattr_parse_nested(tb, TCA_POLICE_MAX, rta) < 0)
421 return NULL;
423 if (tb[TCA_POLICE_TBF-1] == NULL ||
424 RTA_PAYLOAD(tb[TCA_POLICE_TBF-1]) != sizeof(*parm))
425 return NULL;
427 parm = RTA_DATA(tb[TCA_POLICE_TBF-1]);
429 if (parm->index && (p = tcf_police_lookup(parm->index)) != NULL) {
430 p->refcnt++;
431 return p;
434 p = kmalloc(sizeof(*p), GFP_KERNEL);
435 if (p == NULL)
436 return NULL;
438 memset(p, 0, sizeof(*p));
439 p->refcnt = 1;
440 spin_lock_init(&p->lock);
441 p->stats_lock = &p->lock;
442 if (parm->rate.rate) {
443 p->R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE-1]);
444 if (p->R_tab == NULL)
445 goto failure;
446 if (parm->peakrate.rate) {
447 p->P_tab = qdisc_get_rtab(&parm->peakrate,
448 tb[TCA_POLICE_PEAKRATE-1]);
449 if (p->P_tab == NULL)
450 goto failure;
453 if (tb[TCA_POLICE_RESULT-1]) {
454 if (RTA_PAYLOAD(tb[TCA_POLICE_RESULT-1]) != sizeof(u32))
455 goto failure;
456 p->result = *(u32*)RTA_DATA(tb[TCA_POLICE_RESULT-1]);
458 #ifdef CONFIG_NET_ESTIMATOR
459 if (tb[TCA_POLICE_AVRATE-1]) {
460 if (RTA_PAYLOAD(tb[TCA_POLICE_AVRATE-1]) != sizeof(u32))
461 goto failure;
462 p->ewma_rate = *(u32*)RTA_DATA(tb[TCA_POLICE_AVRATE-1]);
464 #endif
465 p->toks = p->burst = parm->burst;
466 p->mtu = parm->mtu;
467 if (p->mtu == 0) {
468 p->mtu = ~0;
469 if (p->R_tab)
470 p->mtu = 255<<p->R_tab->rate.cell_log;
472 if (p->P_tab)
473 p->ptoks = L2T_P(p, p->mtu);
474 PSCHED_GET_TIME(p->t_c);
475 p->index = parm->index ? : tcf_police_new_index();
476 p->action = parm->action;
477 #ifdef CONFIG_NET_ESTIMATOR
478 if (est)
479 gen_new_estimator(&p->bstats, &p->rate_est, p->stats_lock, est);
480 #endif
481 h = tcf_police_hash(p->index);
482 write_lock_bh(&police_lock);
483 p->next = tcf_police_ht[h];
484 tcf_police_ht[h] = p;
485 write_unlock_bh(&police_lock);
486 return p;
488 failure:
489 if (p->R_tab)
490 qdisc_put_rtab(p->R_tab);
491 kfree(p);
492 return NULL;
495 int tcf_police(struct sk_buff *skb, struct tcf_police *p)
497 psched_time_t now;
498 long toks;
499 long ptoks = 0;
501 spin_lock(&p->lock);
503 p->bstats.bytes += skb->len;
504 p->bstats.packets++;
506 #ifdef CONFIG_NET_ESTIMATOR
507 if (p->ewma_rate && p->rate_est.bps >= p->ewma_rate) {
508 p->qstats.overlimits++;
509 spin_unlock(&p->lock);
510 return p->action;
512 #endif
514 if (skb->len <= p->mtu) {
515 if (p->R_tab == NULL) {
516 spin_unlock(&p->lock);
517 return p->result;
520 PSCHED_GET_TIME(now);
522 toks = PSCHED_TDIFF_SAFE(now, p->t_c, p->burst);
524 if (p->P_tab) {
525 ptoks = toks + p->ptoks;
526 if (ptoks > (long)L2T_P(p, p->mtu))
527 ptoks = (long)L2T_P(p, p->mtu);
528 ptoks -= L2T_P(p, skb->len);
530 toks += p->toks;
531 if (toks > (long)p->burst)
532 toks = p->burst;
533 toks -= L2T(p, skb->len);
535 if ((toks|ptoks) >= 0) {
536 p->t_c = now;
537 p->toks = toks;
538 p->ptoks = ptoks;
539 spin_unlock(&p->lock);
540 return p->result;
544 p->qstats.overlimits++;
545 spin_unlock(&p->lock);
546 return p->action;
549 int tcf_police_dump(struct sk_buff *skb, struct tcf_police *p)
551 unsigned char *b = skb->tail;
552 struct tc_police opt;
554 opt.index = p->index;
555 opt.action = p->action;
556 opt.mtu = p->mtu;
557 opt.burst = p->burst;
558 if (p->R_tab)
559 opt.rate = p->R_tab->rate;
560 else
561 memset(&opt.rate, 0, sizeof(opt.rate));
562 if (p->P_tab)
563 opt.peakrate = p->P_tab->rate;
564 else
565 memset(&opt.peakrate, 0, sizeof(opt.peakrate));
566 RTA_PUT(skb, TCA_POLICE_TBF, sizeof(opt), &opt);
567 if (p->result)
568 RTA_PUT(skb, TCA_POLICE_RESULT, sizeof(int), &p->result);
569 #ifdef CONFIG_NET_ESTIMATOR
570 if (p->ewma_rate)
571 RTA_PUT(skb, TCA_POLICE_AVRATE, 4, &p->ewma_rate);
572 #endif
573 return skb->len;
575 rtattr_failure:
576 skb_trim(skb, b - skb->data);
577 return -1;
580 int tcf_police_dump_stats(struct sk_buff *skb, struct tcf_police *p)
582 struct gnet_dump d;
584 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
585 TCA_XSTATS, p->stats_lock, &d) < 0)
586 goto errout;
588 if (gnet_stats_copy_basic(&d, &p->bstats) < 0 ||
589 #ifdef CONFIG_NET_ESTIMATOR
590 gnet_stats_copy_rate_est(&d, &p->rate_est) < 0 ||
591 #endif
592 gnet_stats_copy_queue(&d, &p->qstats) < 0)
593 goto errout;
595 if (gnet_stats_finish_copy(&d) < 0)
596 goto errout;
598 return 0;
600 errout:
601 return -1;
605 EXPORT_SYMBOL(tcf_police);
606 EXPORT_SYMBOL(tcf_police_destroy);
607 EXPORT_SYMBOL(tcf_police_dump);
608 EXPORT_SYMBOL(tcf_police_dump_stats);
609 EXPORT_SYMBOL(tcf_police_hash);
610 EXPORT_SYMBOL(tcf_police_ht);
611 EXPORT_SYMBOL(tcf_police_locate);
612 EXPORT_SYMBOL(tcf_police_lookup);
613 EXPORT_SYMBOL(tcf_police_new_index);