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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_api.c Packet scheduler API. | |
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 | * | |
11 | * Fixes: | |
12 | * | |
13 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. | |
14 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
15 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
1da177e4 | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/errno.h> |
1da177e4 | 23 | #include <linux/skbuff.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/proc_fs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/list.h> | |
4179477f | 29 | #include <linux/hrtimer.h> |
1da177e4 | 30 | |
457c4cbc | 31 | #include <net/net_namespace.h> |
dc5fc579 | 32 | #include <net/netlink.h> |
1da177e4 LT |
33 | #include <net/pkt_sched.h> |
34 | ||
1da177e4 LT |
35 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, u32 clid, |
36 | struct Qdisc *old, struct Qdisc *new); | |
37 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
38 | struct Qdisc *q, unsigned long cl, int event); | |
39 | ||
40 | /* | |
41 | ||
42 | Short review. | |
43 | ------------- | |
44 | ||
45 | This file consists of two interrelated parts: | |
46 | ||
47 | 1. queueing disciplines manager frontend. | |
48 | 2. traffic classes manager frontend. | |
49 | ||
50 | Generally, queueing discipline ("qdisc") is a black box, | |
51 | which is able to enqueue packets and to dequeue them (when | |
52 | device is ready to send something) in order and at times | |
53 | determined by algorithm hidden in it. | |
54 | ||
55 | qdisc's are divided to two categories: | |
56 | - "queues", which have no internal structure visible from outside. | |
57 | - "schedulers", which split all the packets to "traffic classes", | |
58 | using "packet classifiers" (look at cls_api.c) | |
59 | ||
60 | In turn, classes may have child qdiscs (as rule, queues) | |
61 | attached to them etc. etc. etc. | |
62 | ||
63 | The goal of the routines in this file is to translate | |
64 | information supplied by user in the form of handles | |
65 | to more intelligible for kernel form, to make some sanity | |
66 | checks and part of work, which is common to all qdiscs | |
67 | and to provide rtnetlink notifications. | |
68 | ||
69 | All real intelligent work is done inside qdisc modules. | |
70 | ||
71 | ||
72 | ||
73 | Every discipline has two major routines: enqueue and dequeue. | |
74 | ||
75 | ---dequeue | |
76 | ||
77 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
78 | but it does not mean that queue is empty, it just means that | |
79 | discipline does not want to send anything this time. | |
80 | Queue is really empty if q->q.qlen == 0. | |
81 | For complicated disciplines with multiple queues q->q is not | |
82 | real packet queue, but however q->q.qlen must be valid. | |
83 | ||
84 | ---enqueue | |
85 | ||
86 | enqueue returns 0, if packet was enqueued successfully. | |
87 | If packet (this one or another one) was dropped, it returns | |
88 | not zero error code. | |
89 | NET_XMIT_DROP - this packet dropped | |
90 | Expected action: do not backoff, but wait until queue will clear. | |
91 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
92 | Expected action: backoff or ignore | |
93 | NET_XMIT_POLICED - dropped by police. | |
94 | Expected action: backoff or error to real-time apps. | |
95 | ||
96 | Auxiliary routines: | |
97 | ||
98 | ---requeue | |
99 | ||
100 | requeues once dequeued packet. It is used for non-standard or | |
101 | just buggy devices, which can defer output even if dev->tbusy=0. | |
102 | ||
103 | ---reset | |
104 | ||
105 | returns qdisc to initial state: purge all buffers, clear all | |
106 | timers, counters (except for statistics) etc. | |
107 | ||
108 | ---init | |
109 | ||
110 | initializes newly created qdisc. | |
111 | ||
112 | ---destroy | |
113 | ||
114 | destroys resources allocated by init and during lifetime of qdisc. | |
115 | ||
116 | ---change | |
117 | ||
118 | changes qdisc parameters. | |
119 | */ | |
120 | ||
121 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
122 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
123 | ||
124 | ||
125 | /************************************************ | |
126 | * Queueing disciplines manipulation. * | |
127 | ************************************************/ | |
128 | ||
129 | ||
130 | /* The list of all installed queueing disciplines. */ | |
131 | ||
132 | static struct Qdisc_ops *qdisc_base; | |
133 | ||
134 | /* Register/uregister queueing discipline */ | |
135 | ||
136 | int register_qdisc(struct Qdisc_ops *qops) | |
137 | { | |
138 | struct Qdisc_ops *q, **qp; | |
139 | int rc = -EEXIST; | |
140 | ||
141 | write_lock(&qdisc_mod_lock); | |
142 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
143 | if (!strcmp(qops->id, q->id)) | |
144 | goto out; | |
145 | ||
146 | if (qops->enqueue == NULL) | |
147 | qops->enqueue = noop_qdisc_ops.enqueue; | |
148 | if (qops->requeue == NULL) | |
149 | qops->requeue = noop_qdisc_ops.requeue; | |
150 | if (qops->dequeue == NULL) | |
151 | qops->dequeue = noop_qdisc_ops.dequeue; | |
152 | ||
153 | qops->next = NULL; | |
154 | *qp = qops; | |
155 | rc = 0; | |
156 | out: | |
157 | write_unlock(&qdisc_mod_lock); | |
158 | return rc; | |
159 | } | |
160 | ||
161 | int unregister_qdisc(struct Qdisc_ops *qops) | |
162 | { | |
163 | struct Qdisc_ops *q, **qp; | |
164 | int err = -ENOENT; | |
165 | ||
166 | write_lock(&qdisc_mod_lock); | |
167 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) | |
168 | if (q == qops) | |
169 | break; | |
170 | if (q) { | |
171 | *qp = q->next; | |
172 | q->next = NULL; | |
173 | err = 0; | |
174 | } | |
175 | write_unlock(&qdisc_mod_lock); | |
176 | return err; | |
177 | } | |
178 | ||
179 | /* We know handle. Find qdisc among all qdisc's attached to device | |
180 | (root qdisc, all its children, children of children etc.) | |
181 | */ | |
182 | ||
0463d4ae | 183 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 LT |
184 | { |
185 | struct Qdisc *q; | |
186 | ||
1da177e4 | 187 | list_for_each_entry(q, &dev->qdisc_list, list) { |
43effa1e | 188 | if (q->handle == handle) |
1da177e4 | 189 | return q; |
1da177e4 | 190 | } |
1da177e4 LT |
191 | return NULL; |
192 | } | |
193 | ||
194 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
195 | { | |
196 | unsigned long cl; | |
197 | struct Qdisc *leaf; | |
198 | struct Qdisc_class_ops *cops = p->ops->cl_ops; | |
199 | ||
200 | if (cops == NULL) | |
201 | return NULL; | |
202 | cl = cops->get(p, classid); | |
203 | ||
204 | if (cl == 0) | |
205 | return NULL; | |
206 | leaf = cops->leaf(p, cl); | |
207 | cops->put(p, cl); | |
208 | return leaf; | |
209 | } | |
210 | ||
211 | /* Find queueing discipline by name */ | |
212 | ||
213 | static struct Qdisc_ops *qdisc_lookup_ops(struct rtattr *kind) | |
214 | { | |
215 | struct Qdisc_ops *q = NULL; | |
216 | ||
217 | if (kind) { | |
218 | read_lock(&qdisc_mod_lock); | |
219 | for (q = qdisc_base; q; q = q->next) { | |
220 | if (rtattr_strcmp(kind, q->id) == 0) { | |
221 | if (!try_module_get(q->owner)) | |
222 | q = NULL; | |
223 | break; | |
224 | } | |
225 | } | |
226 | read_unlock(&qdisc_mod_lock); | |
227 | } | |
228 | return q; | |
229 | } | |
230 | ||
231 | static struct qdisc_rate_table *qdisc_rtab_list; | |
232 | ||
233 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct rtattr *tab) | |
234 | { | |
235 | struct qdisc_rate_table *rtab; | |
236 | ||
237 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
238 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
239 | rtab->refcnt++; | |
240 | return rtab; | |
241 | } | |
242 | } | |
243 | ||
244 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || RTA_PAYLOAD(tab) != 1024) | |
245 | return NULL; | |
246 | ||
247 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
248 | if (rtab) { | |
249 | rtab->rate = *r; | |
250 | rtab->refcnt = 1; | |
251 | memcpy(rtab->data, RTA_DATA(tab), 1024); | |
252 | rtab->next = qdisc_rtab_list; | |
253 | qdisc_rtab_list = rtab; | |
254 | } | |
255 | return rtab; | |
256 | } | |
257 | ||
258 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
259 | { | |
260 | struct qdisc_rate_table *rtab, **rtabp; | |
261 | ||
262 | if (!tab || --tab->refcnt) | |
263 | return; | |
264 | ||
265 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
266 | if (rtab == tab) { | |
267 | *rtabp = rtab->next; | |
268 | kfree(rtab); | |
269 | return; | |
270 | } | |
271 | } | |
272 | } | |
273 | ||
4179477f PM |
274 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
275 | { | |
276 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
277 | timer); | |
1936502d | 278 | struct net_device *dev = wd->qdisc->dev; |
4179477f PM |
279 | |
280 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
11274e5a | 281 | smp_wmb(); |
0621ed2e | 282 | netif_schedule(dev); |
1936502d | 283 | |
4179477f PM |
284 | return HRTIMER_NORESTART; |
285 | } | |
286 | ||
287 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
288 | { | |
289 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
290 | wd->timer.function = qdisc_watchdog; | |
291 | wd->qdisc = qdisc; | |
292 | } | |
293 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
294 | ||
295 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
296 | { | |
297 | ktime_t time; | |
298 | ||
299 | wd->qdisc->flags |= TCQ_F_THROTTLED; | |
300 | time = ktime_set(0, 0); | |
301 | time = ktime_add_ns(time, PSCHED_US2NS(expires)); | |
302 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); | |
303 | } | |
304 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
305 | ||
306 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
307 | { | |
308 | hrtimer_cancel(&wd->timer); | |
309 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
310 | } | |
311 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 LT |
312 | |
313 | /* Allocate an unique handle from space managed by kernel */ | |
314 | ||
315 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
316 | { | |
317 | int i = 0x10000; | |
318 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
319 | ||
320 | do { | |
321 | autohandle += TC_H_MAKE(0x10000U, 0); | |
322 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
323 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
324 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
325 | ||
326 | return i>0 ? autohandle : 0; | |
327 | } | |
328 | ||
329 | /* Attach toplevel qdisc to device dev */ | |
330 | ||
331 | static struct Qdisc * | |
332 | dev_graft_qdisc(struct net_device *dev, struct Qdisc *qdisc) | |
333 | { | |
334 | struct Qdisc *oqdisc; | |
335 | ||
336 | if (dev->flags & IFF_UP) | |
337 | dev_deactivate(dev); | |
338 | ||
339 | qdisc_lock_tree(dev); | |
340 | if (qdisc && qdisc->flags&TCQ_F_INGRESS) { | |
341 | oqdisc = dev->qdisc_ingress; | |
342 | /* Prune old scheduler */ | |
343 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) { | |
344 | /* delete */ | |
345 | qdisc_reset(oqdisc); | |
346 | dev->qdisc_ingress = NULL; | |
347 | } else { /* new */ | |
348 | dev->qdisc_ingress = qdisc; | |
349 | } | |
350 | ||
351 | } else { | |
352 | ||
353 | oqdisc = dev->qdisc_sleeping; | |
354 | ||
355 | /* Prune old scheduler */ | |
356 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
357 | qdisc_reset(oqdisc); | |
358 | ||
359 | /* ... and graft new one */ | |
360 | if (qdisc == NULL) | |
361 | qdisc = &noop_qdisc; | |
362 | dev->qdisc_sleeping = qdisc; | |
363 | dev->qdisc = &noop_qdisc; | |
364 | } | |
365 | ||
366 | qdisc_unlock_tree(dev); | |
367 | ||
368 | if (dev->flags & IFF_UP) | |
369 | dev_activate(dev); | |
370 | ||
371 | return oqdisc; | |
372 | } | |
373 | ||
43effa1e PM |
374 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
375 | { | |
376 | struct Qdisc_class_ops *cops; | |
377 | unsigned long cl; | |
378 | u32 parentid; | |
379 | ||
380 | if (n == 0) | |
381 | return; | |
382 | while ((parentid = sch->parent)) { | |
0463d4ae | 383 | sch = qdisc_lookup(sch->dev, TC_H_MAJ(parentid)); |
ffc8fefa PM |
384 | if (sch == NULL) { |
385 | WARN_ON(parentid != TC_H_ROOT); | |
386 | return; | |
387 | } | |
43effa1e PM |
388 | cops = sch->ops->cl_ops; |
389 | if (cops->qlen_notify) { | |
390 | cl = cops->get(sch, parentid); | |
391 | cops->qlen_notify(sch, cl); | |
392 | cops->put(sch, cl); | |
393 | } | |
394 | sch->q.qlen -= n; | |
395 | } | |
396 | } | |
397 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 LT |
398 | |
399 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
400 | to device "dev". | |
401 | ||
402 | Old qdisc is not destroyed but returned in *old. | |
403 | */ | |
404 | ||
405 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
406 | u32 classid, | |
407 | struct Qdisc *new, struct Qdisc **old) | |
408 | { | |
409 | int err = 0; | |
410 | struct Qdisc *q = *old; | |
411 | ||
412 | ||
10297b99 | 413 | if (parent == NULL) { |
1da177e4 LT |
414 | if (q && q->flags&TCQ_F_INGRESS) { |
415 | *old = dev_graft_qdisc(dev, q); | |
416 | } else { | |
417 | *old = dev_graft_qdisc(dev, new); | |
418 | } | |
419 | } else { | |
420 | struct Qdisc_class_ops *cops = parent->ops->cl_ops; | |
421 | ||
422 | err = -EINVAL; | |
423 | ||
424 | if (cops) { | |
425 | unsigned long cl = cops->get(parent, classid); | |
426 | if (cl) { | |
427 | err = cops->graft(parent, cl, new, old); | |
1da177e4 LT |
428 | cops->put(parent, cl); |
429 | } | |
430 | } | |
431 | } | |
432 | return err; | |
433 | } | |
434 | ||
435 | /* | |
436 | Allocate and initialize new qdisc. | |
437 | ||
438 | Parameters are passed via opt. | |
439 | */ | |
440 | ||
441 | static struct Qdisc * | |
ffc8fefa PM |
442 | qdisc_create(struct net_device *dev, u32 parent, u32 handle, |
443 | struct rtattr **tca, int *errp) | |
1da177e4 LT |
444 | { |
445 | int err; | |
446 | struct rtattr *kind = tca[TCA_KIND-1]; | |
1da177e4 LT |
447 | struct Qdisc *sch; |
448 | struct Qdisc_ops *ops; | |
1da177e4 LT |
449 | |
450 | ops = qdisc_lookup_ops(kind); | |
451 | #ifdef CONFIG_KMOD | |
452 | if (ops == NULL && kind != NULL) { | |
453 | char name[IFNAMSIZ]; | |
454 | if (rtattr_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { | |
455 | /* We dropped the RTNL semaphore in order to | |
456 | * perform the module load. So, even if we | |
457 | * succeeded in loading the module we have to | |
458 | * tell the caller to replay the request. We | |
459 | * indicate this using -EAGAIN. | |
460 | * We replay the request because the device may | |
461 | * go away in the mean time. | |
462 | */ | |
463 | rtnl_unlock(); | |
464 | request_module("sch_%s", name); | |
465 | rtnl_lock(); | |
466 | ops = qdisc_lookup_ops(kind); | |
467 | if (ops != NULL) { | |
468 | /* We will try again qdisc_lookup_ops, | |
469 | * so don't keep a reference. | |
470 | */ | |
471 | module_put(ops->owner); | |
472 | err = -EAGAIN; | |
473 | goto err_out; | |
474 | } | |
475 | } | |
476 | } | |
477 | #endif | |
478 | ||
b9e2cc0f | 479 | err = -ENOENT; |
1da177e4 LT |
480 | if (ops == NULL) |
481 | goto err_out; | |
482 | ||
3d54b82f TG |
483 | sch = qdisc_alloc(dev, ops); |
484 | if (IS_ERR(sch)) { | |
485 | err = PTR_ERR(sch); | |
1da177e4 | 486 | goto err_out2; |
3d54b82f | 487 | } |
1da177e4 | 488 | |
ffc8fefa PM |
489 | sch->parent = parent; |
490 | ||
3d54b82f | 491 | if (handle == TC_H_INGRESS) { |
1da177e4 | 492 | sch->flags |= TCQ_F_INGRESS; |
fd44de7c | 493 | sch->stats_lock = &dev->ingress_lock; |
3d54b82f | 494 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
fd44de7c PM |
495 | } else { |
496 | sch->stats_lock = &dev->queue_lock; | |
497 | if (handle == 0) { | |
498 | handle = qdisc_alloc_handle(dev); | |
499 | err = -ENOMEM; | |
500 | if (handle == 0) | |
501 | goto err_out3; | |
502 | } | |
1da177e4 LT |
503 | } |
504 | ||
3d54b82f | 505 | sch->handle = handle; |
1da177e4 LT |
506 | |
507 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS-1])) == 0) { | |
023e09a7 TG |
508 | if (tca[TCA_RATE-1]) { |
509 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, | |
510 | sch->stats_lock, | |
511 | tca[TCA_RATE-1]); | |
512 | if (err) { | |
513 | /* | |
514 | * Any broken qdiscs that would require | |
515 | * a ops->reset() here? The qdisc was never | |
516 | * in action so it shouldn't be necessary. | |
517 | */ | |
518 | if (ops->destroy) | |
519 | ops->destroy(sch); | |
520 | goto err_out3; | |
521 | } | |
522 | } | |
1da177e4 LT |
523 | qdisc_lock_tree(dev); |
524 | list_add_tail(&sch->list, &dev->qdisc_list); | |
525 | qdisc_unlock_tree(dev); | |
526 | ||
1da177e4 LT |
527 | return sch; |
528 | } | |
529 | err_out3: | |
530 | dev_put(dev); | |
3d54b82f | 531 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
532 | err_out2: |
533 | module_put(ops->owner); | |
534 | err_out: | |
535 | *errp = err; | |
1da177e4 LT |
536 | return NULL; |
537 | } | |
538 | ||
539 | static int qdisc_change(struct Qdisc *sch, struct rtattr **tca) | |
540 | { | |
541 | if (tca[TCA_OPTIONS-1]) { | |
542 | int err; | |
543 | ||
544 | if (sch->ops->change == NULL) | |
545 | return -EINVAL; | |
546 | err = sch->ops->change(sch, tca[TCA_OPTIONS-1]); | |
547 | if (err) | |
548 | return err; | |
549 | } | |
1da177e4 LT |
550 | if (tca[TCA_RATE-1]) |
551 | gen_replace_estimator(&sch->bstats, &sch->rate_est, | |
552 | sch->stats_lock, tca[TCA_RATE-1]); | |
1da177e4 LT |
553 | return 0; |
554 | } | |
555 | ||
556 | struct check_loop_arg | |
557 | { | |
558 | struct qdisc_walker w; | |
559 | struct Qdisc *p; | |
560 | int depth; | |
561 | }; | |
562 | ||
563 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
564 | ||
565 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
566 | { | |
567 | struct check_loop_arg arg; | |
568 | ||
569 | if (q->ops->cl_ops == NULL) | |
570 | return 0; | |
571 | ||
572 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
573 | arg.w.fn = check_loop_fn; | |
574 | arg.depth = depth; | |
575 | arg.p = p; | |
576 | q->ops->cl_ops->walk(q, &arg.w); | |
577 | return arg.w.stop ? -ELOOP : 0; | |
578 | } | |
579 | ||
580 | static int | |
581 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
582 | { | |
583 | struct Qdisc *leaf; | |
584 | struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
585 | struct check_loop_arg *arg = (struct check_loop_arg *)w; | |
586 | ||
587 | leaf = cops->leaf(q, cl); | |
588 | if (leaf) { | |
589 | if (leaf == arg->p || arg->depth > 7) | |
590 | return -ELOOP; | |
591 | return check_loop(leaf, arg->p, arg->depth + 1); | |
592 | } | |
593 | return 0; | |
594 | } | |
595 | ||
596 | /* | |
597 | * Delete/get qdisc. | |
598 | */ | |
599 | ||
600 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
601 | { | |
602 | struct tcmsg *tcm = NLMSG_DATA(n); | |
603 | struct rtattr **tca = arg; | |
604 | struct net_device *dev; | |
605 | u32 clid = tcm->tcm_parent; | |
606 | struct Qdisc *q = NULL; | |
607 | struct Qdisc *p = NULL; | |
608 | int err; | |
609 | ||
881d966b | 610 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
611 | return -ENODEV; |
612 | ||
613 | if (clid) { | |
614 | if (clid != TC_H_ROOT) { | |
615 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
616 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
617 | return -ENOENT; | |
618 | q = qdisc_leaf(p, clid); | |
619 | } else { /* ingress */ | |
620 | q = dev->qdisc_ingress; | |
10297b99 | 621 | } |
1da177e4 LT |
622 | } else { |
623 | q = dev->qdisc_sleeping; | |
624 | } | |
625 | if (!q) | |
626 | return -ENOENT; | |
627 | ||
628 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
629 | return -EINVAL; | |
630 | } else { | |
631 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
632 | return -ENOENT; | |
633 | } | |
634 | ||
635 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) | |
636 | return -EINVAL; | |
637 | ||
638 | if (n->nlmsg_type == RTM_DELQDISC) { | |
639 | if (!clid) | |
640 | return -EINVAL; | |
641 | if (q->handle == 0) | |
642 | return -ENOENT; | |
643 | if ((err = qdisc_graft(dev, p, clid, NULL, &q)) != 0) | |
644 | return err; | |
645 | if (q) { | |
646 | qdisc_notify(skb, n, clid, q, NULL); | |
fd44de7c | 647 | qdisc_lock_tree(dev); |
1da177e4 | 648 | qdisc_destroy(q); |
fd44de7c | 649 | qdisc_unlock_tree(dev); |
1da177e4 LT |
650 | } |
651 | } else { | |
652 | qdisc_notify(skb, n, clid, NULL, q); | |
653 | } | |
654 | return 0; | |
655 | } | |
656 | ||
657 | /* | |
658 | Create/change qdisc. | |
659 | */ | |
660 | ||
661 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
662 | { | |
663 | struct tcmsg *tcm; | |
664 | struct rtattr **tca; | |
665 | struct net_device *dev; | |
666 | u32 clid; | |
667 | struct Qdisc *q, *p; | |
668 | int err; | |
669 | ||
670 | replay: | |
671 | /* Reinit, just in case something touches this. */ | |
672 | tcm = NLMSG_DATA(n); | |
673 | tca = arg; | |
674 | clid = tcm->tcm_parent; | |
675 | q = p = NULL; | |
676 | ||
881d966b | 677 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
678 | return -ENODEV; |
679 | ||
680 | if (clid) { | |
681 | if (clid != TC_H_ROOT) { | |
682 | if (clid != TC_H_INGRESS) { | |
683 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
684 | return -ENOENT; | |
685 | q = qdisc_leaf(p, clid); | |
686 | } else { /*ingress */ | |
687 | q = dev->qdisc_ingress; | |
688 | } | |
689 | } else { | |
690 | q = dev->qdisc_sleeping; | |
691 | } | |
692 | ||
693 | /* It may be default qdisc, ignore it */ | |
694 | if (q && q->handle == 0) | |
695 | q = NULL; | |
696 | ||
697 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
698 | if (tcm->tcm_handle) { | |
699 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
700 | return -EEXIST; | |
701 | if (TC_H_MIN(tcm->tcm_handle)) | |
702 | return -EINVAL; | |
703 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
704 | goto create_n_graft; | |
705 | if (n->nlmsg_flags&NLM_F_EXCL) | |
706 | return -EEXIST; | |
707 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) | |
708 | return -EINVAL; | |
709 | if (q == p || | |
710 | (p && check_loop(q, p, 0))) | |
711 | return -ELOOP; | |
712 | atomic_inc(&q->refcnt); | |
713 | goto graft; | |
714 | } else { | |
715 | if (q == NULL) | |
716 | goto create_n_graft; | |
717 | ||
718 | /* This magic test requires explanation. | |
719 | * | |
720 | * We know, that some child q is already | |
721 | * attached to this parent and have choice: | |
722 | * either to change it or to create/graft new one. | |
723 | * | |
724 | * 1. We are allowed to create/graft only | |
725 | * if CREATE and REPLACE flags are set. | |
726 | * | |
727 | * 2. If EXCL is set, requestor wanted to say, | |
728 | * that qdisc tcm_handle is not expected | |
729 | * to exist, so that we choose create/graft too. | |
730 | * | |
731 | * 3. The last case is when no flags are set. | |
732 | * Alas, it is sort of hole in API, we | |
733 | * cannot decide what to do unambiguously. | |
734 | * For now we select create/graft, if | |
735 | * user gave KIND, which does not match existing. | |
736 | */ | |
737 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
738 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
739 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
740 | (tca[TCA_KIND-1] && | |
741 | rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)))) | |
742 | goto create_n_graft; | |
743 | } | |
744 | } | |
745 | } else { | |
746 | if (!tcm->tcm_handle) | |
747 | return -EINVAL; | |
748 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
749 | } | |
750 | ||
751 | /* Change qdisc parameters */ | |
752 | if (q == NULL) | |
753 | return -ENOENT; | |
754 | if (n->nlmsg_flags&NLM_F_EXCL) | |
755 | return -EEXIST; | |
756 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) | |
757 | return -EINVAL; | |
758 | err = qdisc_change(q, tca); | |
759 | if (err == 0) | |
760 | qdisc_notify(skb, n, clid, NULL, q); | |
761 | return err; | |
762 | ||
763 | create_n_graft: | |
764 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
765 | return -ENOENT; | |
766 | if (clid == TC_H_INGRESS) | |
ffc8fefa PM |
767 | q = qdisc_create(dev, tcm->tcm_parent, tcm->tcm_parent, |
768 | tca, &err); | |
10297b99 | 769 | else |
ffc8fefa PM |
770 | q = qdisc_create(dev, tcm->tcm_parent, tcm->tcm_handle, |
771 | tca, &err); | |
1da177e4 LT |
772 | if (q == NULL) { |
773 | if (err == -EAGAIN) | |
774 | goto replay; | |
775 | return err; | |
776 | } | |
777 | ||
778 | graft: | |
779 | if (1) { | |
780 | struct Qdisc *old_q = NULL; | |
781 | err = qdisc_graft(dev, p, clid, q, &old_q); | |
782 | if (err) { | |
783 | if (q) { | |
fd44de7c | 784 | qdisc_lock_tree(dev); |
1da177e4 | 785 | qdisc_destroy(q); |
fd44de7c | 786 | qdisc_unlock_tree(dev); |
1da177e4 LT |
787 | } |
788 | return err; | |
789 | } | |
790 | qdisc_notify(skb, n, clid, old_q, q); | |
791 | if (old_q) { | |
fd44de7c | 792 | qdisc_lock_tree(dev); |
1da177e4 | 793 | qdisc_destroy(old_q); |
fd44de7c | 794 | qdisc_unlock_tree(dev); |
1da177e4 LT |
795 | } |
796 | } | |
797 | return 0; | |
798 | } | |
799 | ||
800 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 801 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
802 | { |
803 | struct tcmsg *tcm; | |
804 | struct nlmsghdr *nlh; | |
27a884dc | 805 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
806 | struct gnet_dump d; |
807 | ||
e431b8c0 | 808 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
809 | tcm = NLMSG_DATA(nlh); |
810 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
811 | tcm->tcm__pad1 = 0; |
812 | tcm->tcm__pad2 = 0; | |
1da177e4 LT |
813 | tcm->tcm_ifindex = q->dev->ifindex; |
814 | tcm->tcm_parent = clid; | |
815 | tcm->tcm_handle = q->handle; | |
816 | tcm->tcm_info = atomic_read(&q->refcnt); | |
817 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, q->ops->id); | |
818 | if (q->ops->dump && q->ops->dump(q, skb) < 0) | |
819 | goto rtattr_failure; | |
820 | q->qstats.qlen = q->q.qlen; | |
821 | ||
822 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, | |
823 | TCA_XSTATS, q->stats_lock, &d) < 0) | |
824 | goto rtattr_failure; | |
825 | ||
826 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
827 | goto rtattr_failure; | |
828 | ||
829 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
1da177e4 | 830 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
1da177e4 LT |
831 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
832 | goto rtattr_failure; | |
10297b99 | 833 | |
1da177e4 LT |
834 | if (gnet_stats_finish_copy(&d) < 0) |
835 | goto rtattr_failure; | |
10297b99 | 836 | |
27a884dc | 837 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
838 | return skb->len; |
839 | ||
840 | nlmsg_failure: | |
841 | rtattr_failure: | |
dc5fc579 | 842 | nlmsg_trim(skb, b); |
1da177e4 LT |
843 | return -1; |
844 | } | |
845 | ||
846 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
847 | u32 clid, struct Qdisc *old, struct Qdisc *new) | |
848 | { | |
849 | struct sk_buff *skb; | |
850 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
851 | ||
852 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
853 | if (!skb) | |
854 | return -ENOBUFS; | |
855 | ||
856 | if (old && old->handle) { | |
857 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) | |
858 | goto err_out; | |
859 | } | |
860 | if (new) { | |
861 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
862 | goto err_out; | |
863 | } | |
864 | ||
865 | if (skb->len) | |
ac6d439d | 866 | return rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
867 | |
868 | err_out: | |
869 | kfree_skb(skb); | |
870 | return -EINVAL; | |
871 | } | |
872 | ||
873 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) | |
874 | { | |
875 | int idx, q_idx; | |
876 | int s_idx, s_q_idx; | |
877 | struct net_device *dev; | |
878 | struct Qdisc *q; | |
879 | ||
880 | s_idx = cb->args[0]; | |
881 | s_q_idx = q_idx = cb->args[1]; | |
882 | read_lock(&dev_base_lock); | |
7562f876 | 883 | idx = 0; |
881d966b | 884 | for_each_netdev(&init_net, dev) { |
1da177e4 | 885 | if (idx < s_idx) |
7562f876 | 886 | goto cont; |
1da177e4 LT |
887 | if (idx > s_idx) |
888 | s_q_idx = 0; | |
1da177e4 LT |
889 | q_idx = 0; |
890 | list_for_each_entry(q, &dev->qdisc_list, list) { | |
891 | if (q_idx < s_q_idx) { | |
892 | q_idx++; | |
893 | continue; | |
894 | } | |
895 | if (tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
0463d4ae | 896 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1da177e4 | 897 | goto done; |
1da177e4 LT |
898 | q_idx++; |
899 | } | |
7562f876 PE |
900 | cont: |
901 | idx++; | |
1da177e4 LT |
902 | } |
903 | ||
904 | done: | |
905 | read_unlock(&dev_base_lock); | |
906 | ||
907 | cb->args[0] = idx; | |
908 | cb->args[1] = q_idx; | |
909 | ||
910 | return skb->len; | |
911 | } | |
912 | ||
913 | ||
914 | ||
915 | /************************************************ | |
916 | * Traffic classes manipulation. * | |
917 | ************************************************/ | |
918 | ||
919 | ||
920 | ||
921 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
922 | { | |
923 | struct tcmsg *tcm = NLMSG_DATA(n); | |
924 | struct rtattr **tca = arg; | |
925 | struct net_device *dev; | |
926 | struct Qdisc *q = NULL; | |
927 | struct Qdisc_class_ops *cops; | |
928 | unsigned long cl = 0; | |
929 | unsigned long new_cl; | |
930 | u32 pid = tcm->tcm_parent; | |
931 | u32 clid = tcm->tcm_handle; | |
932 | u32 qid = TC_H_MAJ(clid); | |
933 | int err; | |
934 | ||
881d966b | 935 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
936 | return -ENODEV; |
937 | ||
938 | /* | |
939 | parent == TC_H_UNSPEC - unspecified parent. | |
940 | parent == TC_H_ROOT - class is root, which has no parent. | |
941 | parent == X:0 - parent is root class. | |
942 | parent == X:Y - parent is a node in hierarchy. | |
943 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
944 | ||
945 | handle == 0:0 - generate handle from kernel pool. | |
946 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
947 | handle == X:Y - clear. | |
948 | handle == X:0 - root class. | |
949 | */ | |
950 | ||
951 | /* Step 1. Determine qdisc handle X:0 */ | |
952 | ||
953 | if (pid != TC_H_ROOT) { | |
954 | u32 qid1 = TC_H_MAJ(pid); | |
955 | ||
956 | if (qid && qid1) { | |
957 | /* If both majors are known, they must be identical. */ | |
958 | if (qid != qid1) | |
959 | return -EINVAL; | |
960 | } else if (qid1) { | |
961 | qid = qid1; | |
962 | } else if (qid == 0) | |
963 | qid = dev->qdisc_sleeping->handle; | |
964 | ||
965 | /* Now qid is genuine qdisc handle consistent | |
966 | both with parent and child. | |
967 | ||
968 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
969 | */ | |
970 | if (pid) | |
971 | pid = TC_H_MAKE(qid, pid); | |
972 | } else { | |
973 | if (qid == 0) | |
974 | qid = dev->qdisc_sleeping->handle; | |
975 | } | |
976 | ||
977 | /* OK. Locate qdisc */ | |
10297b99 | 978 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
1da177e4 LT |
979 | return -ENOENT; |
980 | ||
981 | /* An check that it supports classes */ | |
982 | cops = q->ops->cl_ops; | |
983 | if (cops == NULL) | |
984 | return -EINVAL; | |
985 | ||
986 | /* Now try to get class */ | |
987 | if (clid == 0) { | |
988 | if (pid == TC_H_ROOT) | |
989 | clid = qid; | |
990 | } else | |
991 | clid = TC_H_MAKE(qid, clid); | |
992 | ||
993 | if (clid) | |
994 | cl = cops->get(q, clid); | |
995 | ||
996 | if (cl == 0) { | |
997 | err = -ENOENT; | |
998 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
999 | goto out; | |
1000 | } else { | |
1001 | switch (n->nlmsg_type) { | |
10297b99 | 1002 | case RTM_NEWTCLASS: |
1da177e4 LT |
1003 | err = -EEXIST; |
1004 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1005 | goto out; | |
1006 | break; | |
1007 | case RTM_DELTCLASS: | |
1008 | err = cops->delete(q, cl); | |
1009 | if (err == 0) | |
1010 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); | |
1011 | goto out; | |
1012 | case RTM_GETTCLASS: | |
1013 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); | |
1014 | goto out; | |
1015 | default: | |
1016 | err = -EINVAL; | |
1017 | goto out; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | new_cl = cl; | |
1022 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1023 | if (err == 0) | |
1024 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); | |
1025 | ||
1026 | out: | |
1027 | if (cl) | |
1028 | cops->put(q, cl); | |
1029 | ||
1030 | return err; | |
1031 | } | |
1032 | ||
1033 | ||
1034 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1035 | unsigned long cl, | |
e431b8c0 | 1036 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1037 | { |
1038 | struct tcmsg *tcm; | |
1039 | struct nlmsghdr *nlh; | |
27a884dc | 1040 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1041 | struct gnet_dump d; |
1042 | struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; | |
1043 | ||
e431b8c0 | 1044 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1045 | tcm = NLMSG_DATA(nlh); |
1046 | tcm->tcm_family = AF_UNSPEC; | |
1047 | tcm->tcm_ifindex = q->dev->ifindex; | |
1048 | tcm->tcm_parent = q->handle; | |
1049 | tcm->tcm_handle = q->handle; | |
1050 | tcm->tcm_info = 0; | |
1051 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, q->ops->id); | |
1052 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) | |
1053 | goto rtattr_failure; | |
1054 | ||
1055 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, | |
1056 | TCA_XSTATS, q->stats_lock, &d) < 0) | |
1057 | goto rtattr_failure; | |
1058 | ||
1059 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1060 | goto rtattr_failure; | |
1061 | ||
1062 | if (gnet_stats_finish_copy(&d) < 0) | |
1063 | goto rtattr_failure; | |
1064 | ||
27a884dc | 1065 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1066 | return skb->len; |
1067 | ||
1068 | nlmsg_failure: | |
1069 | rtattr_failure: | |
dc5fc579 | 1070 | nlmsg_trim(skb, b); |
1da177e4 LT |
1071 | return -1; |
1072 | } | |
1073 | ||
1074 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1075 | struct Qdisc *q, unsigned long cl, int event) | |
1076 | { | |
1077 | struct sk_buff *skb; | |
1078 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1079 | ||
1080 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1081 | if (!skb) | |
1082 | return -ENOBUFS; | |
1083 | ||
1084 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1085 | kfree_skb(skb); | |
1086 | return -EINVAL; | |
1087 | } | |
1088 | ||
ac6d439d | 1089 | return rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1090 | } |
1091 | ||
1092 | struct qdisc_dump_args | |
1093 | { | |
1094 | struct qdisc_walker w; | |
1095 | struct sk_buff *skb; | |
1096 | struct netlink_callback *cb; | |
1097 | }; | |
1098 | ||
1099 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1100 | { | |
1101 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1102 | ||
1103 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1104 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1105 | } | |
1106 | ||
1107 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) | |
1108 | { | |
1109 | int t; | |
1110 | int s_t; | |
1111 | struct net_device *dev; | |
1112 | struct Qdisc *q; | |
1113 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); | |
1114 | struct qdisc_dump_args arg; | |
1115 | ||
1116 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) | |
1117 | return 0; | |
881d966b | 1118 | if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1119 | return 0; |
1120 | ||
1121 | s_t = cb->args[0]; | |
1122 | t = 0; | |
1123 | ||
1da177e4 LT |
1124 | list_for_each_entry(q, &dev->qdisc_list, list) { |
1125 | if (t < s_t || !q->ops->cl_ops || | |
1126 | (tcm->tcm_parent && | |
1127 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1128 | t++; | |
1129 | continue; | |
1130 | } | |
1131 | if (t > s_t) | |
1132 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1133 | arg.w.fn = qdisc_class_dump; | |
1134 | arg.skb = skb; | |
1135 | arg.cb = cb; | |
1136 | arg.w.stop = 0; | |
1137 | arg.w.skip = cb->args[1]; | |
1138 | arg.w.count = 0; | |
1139 | q->ops->cl_ops->walk(q, &arg.w); | |
1140 | cb->args[1] = arg.w.count; | |
1141 | if (arg.w.stop) | |
1142 | break; | |
1143 | t++; | |
1144 | } | |
1da177e4 LT |
1145 | |
1146 | cb->args[0] = t; | |
1147 | ||
1148 | dev_put(dev); | |
1149 | return skb->len; | |
1150 | } | |
1151 | ||
1152 | /* Main classifier routine: scans classifier chain attached | |
1153 | to this qdisc, (optionally) tests for protocol and asks | |
1154 | specific classifiers. | |
1155 | */ | |
73ca4918 PM |
1156 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1157 | struct tcf_result *res) | |
1158 | { | |
1159 | __be16 protocol = skb->protocol; | |
1160 | int err = 0; | |
1161 | ||
1162 | for (; tp; tp = tp->next) { | |
1163 | if ((tp->protocol == protocol || | |
1164 | tp->protocol == htons(ETH_P_ALL)) && | |
1165 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1166 | #ifdef CONFIG_NET_CLS_ACT | |
1167 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1168 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1169 | #endif | |
1170 | return err; | |
1171 | } | |
1172 | } | |
1173 | return -1; | |
1174 | } | |
1175 | EXPORT_SYMBOL(tc_classify_compat); | |
1176 | ||
1da177e4 | 1177 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1178 | struct tcf_result *res) |
1da177e4 LT |
1179 | { |
1180 | int err = 0; | |
73ca4918 | 1181 | __be16 protocol; |
1da177e4 LT |
1182 | #ifdef CONFIG_NET_CLS_ACT |
1183 | struct tcf_proto *otp = tp; | |
1184 | reclassify: | |
1185 | #endif | |
1186 | protocol = skb->protocol; | |
1187 | ||
73ca4918 | 1188 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1189 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1190 | if (err == TC_ACT_RECLASSIFY) { |
1191 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1192 | tp = otp; | |
1193 | ||
1194 | if (verd++ >= MAX_REC_LOOP) { | |
1195 | printk("rule prio %u protocol %02x reclassify loop, " | |
1196 | "packet dropped\n", | |
1197 | tp->prio&0xffff, ntohs(tp->protocol)); | |
1198 | return TC_ACT_SHOT; | |
1da177e4 | 1199 | } |
73ca4918 PM |
1200 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1201 | goto reclassify; | |
1da177e4 | 1202 | } |
73ca4918 PM |
1203 | #endif |
1204 | return err; | |
1da177e4 | 1205 | } |
73ca4918 | 1206 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1207 | |
a48b5a61 PM |
1208 | void tcf_destroy(struct tcf_proto *tp) |
1209 | { | |
1210 | tp->ops->destroy(tp); | |
1211 | module_put(tp->ops->owner); | |
1212 | kfree(tp); | |
1213 | } | |
1214 | ||
1215 | void tcf_destroy_chain(struct tcf_proto *fl) | |
1216 | { | |
1217 | struct tcf_proto *tp; | |
1218 | ||
1219 | while ((tp = fl) != NULL) { | |
1220 | fl = tp->next; | |
1221 | tcf_destroy(tp); | |
1222 | } | |
1223 | } | |
1224 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1225 | ||
1da177e4 LT |
1226 | #ifdef CONFIG_PROC_FS |
1227 | static int psched_show(struct seq_file *seq, void *v) | |
1228 | { | |
3c0cfc13 PM |
1229 | struct timespec ts; |
1230 | ||
1231 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1232 | seq_printf(seq, "%08x %08x %08x %08x\n", |
641b9e0e | 1233 | (u32)NSEC_PER_USEC, (u32)PSCHED_US2NS(1), |
514bca32 | 1234 | 1000000, |
3c0cfc13 | 1235 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1236 | |
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | static int psched_open(struct inode *inode, struct file *file) | |
1241 | { | |
1242 | return single_open(file, psched_show, PDE(inode)->data); | |
1243 | } | |
1244 | ||
da7071d7 | 1245 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1246 | .owner = THIS_MODULE, |
1247 | .open = psched_open, | |
1248 | .read = seq_read, | |
1249 | .llseek = seq_lseek, | |
1250 | .release = single_release, | |
10297b99 | 1251 | }; |
1da177e4 LT |
1252 | #endif |
1253 | ||
1da177e4 LT |
1254 | static int __init pktsched_init(void) |
1255 | { | |
1da177e4 LT |
1256 | register_qdisc(&pfifo_qdisc_ops); |
1257 | register_qdisc(&bfifo_qdisc_ops); | |
457c4cbc | 1258 | proc_net_fops_create(&init_net, "psched", 0, &psched_fops); |
1da177e4 | 1259 | |
be577ddc TG |
1260 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
1261 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); | |
1262 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); | |
1263 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); | |
1264 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); | |
1265 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); | |
1266 | ||
1da177e4 LT |
1267 | return 0; |
1268 | } | |
1269 | ||
1270 | subsys_initcall(pktsched_init); | |
1271 | ||
1272 | EXPORT_SYMBOL(qdisc_get_rtab); | |
1273 | EXPORT_SYMBOL(qdisc_put_rtab); | |
1274 | EXPORT_SYMBOL(register_qdisc); | |
1275 | EXPORT_SYMBOL(unregister_qdisc); |