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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> |
b854272b | 32 | #include <net/sock.h> |
dc5fc579 | 33 | #include <net/netlink.h> |
1da177e4 LT |
34 | #include <net/pkt_sched.h> |
35 | ||
1da177e4 LT |
36 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, u32 clid, |
37 | struct Qdisc *old, struct Qdisc *new); | |
38 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
39 | struct Qdisc *q, unsigned long cl, int event); | |
40 | ||
41 | /* | |
42 | ||
43 | Short review. | |
44 | ------------- | |
45 | ||
46 | This file consists of two interrelated parts: | |
47 | ||
48 | 1. queueing disciplines manager frontend. | |
49 | 2. traffic classes manager frontend. | |
50 | ||
51 | Generally, queueing discipline ("qdisc") is a black box, | |
52 | which is able to enqueue packets and to dequeue them (when | |
53 | device is ready to send something) in order and at times | |
54 | determined by algorithm hidden in it. | |
55 | ||
56 | qdisc's are divided to two categories: | |
57 | - "queues", which have no internal structure visible from outside. | |
58 | - "schedulers", which split all the packets to "traffic classes", | |
59 | using "packet classifiers" (look at cls_api.c) | |
60 | ||
61 | In turn, classes may have child qdiscs (as rule, queues) | |
62 | attached to them etc. etc. etc. | |
63 | ||
64 | The goal of the routines in this file is to translate | |
65 | information supplied by user in the form of handles | |
66 | to more intelligible for kernel form, to make some sanity | |
67 | checks and part of work, which is common to all qdiscs | |
68 | and to provide rtnetlink notifications. | |
69 | ||
70 | All real intelligent work is done inside qdisc modules. | |
71 | ||
72 | ||
73 | ||
74 | Every discipline has two major routines: enqueue and dequeue. | |
75 | ||
76 | ---dequeue | |
77 | ||
78 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
79 | but it does not mean that queue is empty, it just means that | |
80 | discipline does not want to send anything this time. | |
81 | Queue is really empty if q->q.qlen == 0. | |
82 | For complicated disciplines with multiple queues q->q is not | |
83 | real packet queue, but however q->q.qlen must be valid. | |
84 | ||
85 | ---enqueue | |
86 | ||
87 | enqueue returns 0, if packet was enqueued successfully. | |
88 | If packet (this one or another one) was dropped, it returns | |
89 | not zero error code. | |
90 | NET_XMIT_DROP - this packet dropped | |
91 | Expected action: do not backoff, but wait until queue will clear. | |
92 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
93 | Expected action: backoff or ignore | |
94 | NET_XMIT_POLICED - dropped by police. | |
95 | Expected action: backoff or error to real-time apps. | |
96 | ||
97 | Auxiliary routines: | |
98 | ||
99 | ---requeue | |
100 | ||
101 | requeues once dequeued packet. It is used for non-standard or | |
e65d22e1 | 102 | just buggy devices, which can defer output even if netif_queue_stopped()=0. |
1da177e4 LT |
103 | |
104 | ---reset | |
105 | ||
106 | returns qdisc to initial state: purge all buffers, clear all | |
107 | timers, counters (except for statistics) etc. | |
108 | ||
109 | ---init | |
110 | ||
111 | initializes newly created qdisc. | |
112 | ||
113 | ---destroy | |
114 | ||
115 | destroys resources allocated by init and during lifetime of qdisc. | |
116 | ||
117 | ---change | |
118 | ||
119 | changes qdisc parameters. | |
120 | */ | |
121 | ||
122 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
123 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
124 | ||
125 | ||
126 | /************************************************ | |
127 | * Queueing disciplines manipulation. * | |
128 | ************************************************/ | |
129 | ||
130 | ||
131 | /* The list of all installed queueing disciplines. */ | |
132 | ||
133 | static struct Qdisc_ops *qdisc_base; | |
134 | ||
135 | /* Register/uregister queueing discipline */ | |
136 | ||
137 | int register_qdisc(struct Qdisc_ops *qops) | |
138 | { | |
139 | struct Qdisc_ops *q, **qp; | |
140 | int rc = -EEXIST; | |
141 | ||
142 | write_lock(&qdisc_mod_lock); | |
143 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
144 | if (!strcmp(qops->id, q->id)) | |
145 | goto out; | |
146 | ||
147 | if (qops->enqueue == NULL) | |
148 | qops->enqueue = noop_qdisc_ops.enqueue; | |
149 | if (qops->requeue == NULL) | |
150 | qops->requeue = noop_qdisc_ops.requeue; | |
151 | if (qops->dequeue == NULL) | |
152 | qops->dequeue = noop_qdisc_ops.dequeue; | |
153 | ||
154 | qops->next = NULL; | |
155 | *qp = qops; | |
156 | rc = 0; | |
157 | out: | |
158 | write_unlock(&qdisc_mod_lock); | |
159 | return rc; | |
160 | } | |
62e3ba1b | 161 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
162 | |
163 | int unregister_qdisc(struct Qdisc_ops *qops) | |
164 | { | |
165 | struct Qdisc_ops *q, **qp; | |
166 | int err = -ENOENT; | |
167 | ||
168 | write_lock(&qdisc_mod_lock); | |
169 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) | |
170 | if (q == qops) | |
171 | break; | |
172 | if (q) { | |
173 | *qp = q->next; | |
174 | q->next = NULL; | |
175 | err = 0; | |
176 | } | |
177 | write_unlock(&qdisc_mod_lock); | |
178 | return err; | |
179 | } | |
62e3ba1b | 180 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 LT |
181 | |
182 | /* We know handle. Find qdisc among all qdisc's attached to device | |
183 | (root qdisc, all its children, children of children etc.) | |
184 | */ | |
185 | ||
e8a0464c | 186 | static struct Qdisc *__qdisc_lookup(struct netdev_queue *dev_queue, u32 handle) |
1da177e4 LT |
187 | { |
188 | struct Qdisc *q; | |
189 | ||
b0e1e646 | 190 | list_for_each_entry(q, &dev_queue->qdisc_list, list) { |
43effa1e | 191 | if (q->handle == handle) |
1da177e4 | 192 | return q; |
1da177e4 | 193 | } |
1da177e4 LT |
194 | return NULL; |
195 | } | |
196 | ||
e8a0464c DM |
197 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
198 | { | |
199 | unsigned int i; | |
200 | ||
201 | for (i = 0; i < dev->num_tx_queues; i++) { | |
202 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
203 | struct Qdisc *q = __qdisc_lookup(txq, handle); | |
204 | if (q) | |
205 | return q; | |
206 | } | |
207 | return NULL; | |
208 | } | |
209 | ||
1da177e4 LT |
210 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) |
211 | { | |
212 | unsigned long cl; | |
213 | struct Qdisc *leaf; | |
20fea08b | 214 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
215 | |
216 | if (cops == NULL) | |
217 | return NULL; | |
218 | cl = cops->get(p, classid); | |
219 | ||
220 | if (cl == 0) | |
221 | return NULL; | |
222 | leaf = cops->leaf(p, cl); | |
223 | cops->put(p, cl); | |
224 | return leaf; | |
225 | } | |
226 | ||
227 | /* Find queueing discipline by name */ | |
228 | ||
1e90474c | 229 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
230 | { |
231 | struct Qdisc_ops *q = NULL; | |
232 | ||
233 | if (kind) { | |
234 | read_lock(&qdisc_mod_lock); | |
235 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 236 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
237 | if (!try_module_get(q->owner)) |
238 | q = NULL; | |
239 | break; | |
240 | } | |
241 | } | |
242 | read_unlock(&qdisc_mod_lock); | |
243 | } | |
244 | return q; | |
245 | } | |
246 | ||
247 | static struct qdisc_rate_table *qdisc_rtab_list; | |
248 | ||
1e90474c | 249 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
250 | { |
251 | struct qdisc_rate_table *rtab; | |
252 | ||
253 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
254 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
255 | rtab->refcnt++; | |
256 | return rtab; | |
257 | } | |
258 | } | |
259 | ||
5feb5e1a PM |
260 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
261 | nla_len(tab) != TC_RTAB_SIZE) | |
1da177e4 LT |
262 | return NULL; |
263 | ||
264 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
265 | if (rtab) { | |
266 | rtab->rate = *r; | |
267 | rtab->refcnt = 1; | |
1e90474c | 268 | memcpy(rtab->data, nla_data(tab), 1024); |
1da177e4 LT |
269 | rtab->next = qdisc_rtab_list; |
270 | qdisc_rtab_list = rtab; | |
271 | } | |
272 | return rtab; | |
273 | } | |
62e3ba1b | 274 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
275 | |
276 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
277 | { | |
278 | struct qdisc_rate_table *rtab, **rtabp; | |
279 | ||
280 | if (!tab || --tab->refcnt) | |
281 | return; | |
282 | ||
283 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
284 | if (rtab == tab) { | |
285 | *rtabp = rtab->next; | |
286 | kfree(rtab); | |
287 | return; | |
288 | } | |
289 | } | |
290 | } | |
62e3ba1b | 291 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 292 | |
4179477f PM |
293 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
294 | { | |
295 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
296 | timer); | |
297 | ||
298 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
11274e5a | 299 | smp_wmb(); |
37437bb2 | 300 | __netif_schedule(wd->qdisc); |
1936502d | 301 | |
4179477f PM |
302 | return HRTIMER_NORESTART; |
303 | } | |
304 | ||
305 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
306 | { | |
307 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
308 | wd->timer.function = qdisc_watchdog; | |
309 | wd->qdisc = qdisc; | |
310 | } | |
311 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
312 | ||
313 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
314 | { | |
315 | ktime_t time; | |
316 | ||
317 | wd->qdisc->flags |= TCQ_F_THROTTLED; | |
318 | time = ktime_set(0, 0); | |
319 | time = ktime_add_ns(time, PSCHED_US2NS(expires)); | |
320 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); | |
321 | } | |
322 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
323 | ||
324 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
325 | { | |
326 | hrtimer_cancel(&wd->timer); | |
327 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
328 | } | |
329 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 330 | |
6fe1c7a5 PM |
331 | struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
332 | { | |
333 | unsigned int size = n * sizeof(struct hlist_head), i; | |
334 | struct hlist_head *h; | |
335 | ||
336 | if (size <= PAGE_SIZE) | |
337 | h = kmalloc(size, GFP_KERNEL); | |
338 | else | |
339 | h = (struct hlist_head *) | |
340 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
341 | ||
342 | if (h != NULL) { | |
343 | for (i = 0; i < n; i++) | |
344 | INIT_HLIST_HEAD(&h[i]); | |
345 | } | |
346 | return h; | |
347 | } | |
348 | ||
349 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
350 | { | |
351 | unsigned int size = n * sizeof(struct hlist_head); | |
352 | ||
353 | if (size <= PAGE_SIZE) | |
354 | kfree(h); | |
355 | else | |
356 | free_pages((unsigned long)h, get_order(size)); | |
357 | } | |
358 | ||
359 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
360 | { | |
361 | struct Qdisc_class_common *cl; | |
362 | struct hlist_node *n, *next; | |
363 | struct hlist_head *nhash, *ohash; | |
364 | unsigned int nsize, nmask, osize; | |
365 | unsigned int i, h; | |
366 | ||
367 | /* Rehash when load factor exceeds 0.75 */ | |
368 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
369 | return; | |
370 | nsize = clhash->hashsize * 2; | |
371 | nmask = nsize - 1; | |
372 | nhash = qdisc_class_hash_alloc(nsize); | |
373 | if (nhash == NULL) | |
374 | return; | |
375 | ||
376 | ohash = clhash->hash; | |
377 | osize = clhash->hashsize; | |
378 | ||
379 | sch_tree_lock(sch); | |
380 | for (i = 0; i < osize; i++) { | |
381 | hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) { | |
382 | h = qdisc_class_hash(cl->classid, nmask); | |
383 | hlist_add_head(&cl->hnode, &nhash[h]); | |
384 | } | |
385 | } | |
386 | clhash->hash = nhash; | |
387 | clhash->hashsize = nsize; | |
388 | clhash->hashmask = nmask; | |
389 | sch_tree_unlock(sch); | |
390 | ||
391 | qdisc_class_hash_free(ohash, osize); | |
392 | } | |
393 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
394 | ||
395 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
396 | { | |
397 | unsigned int size = 4; | |
398 | ||
399 | clhash->hash = qdisc_class_hash_alloc(size); | |
400 | if (clhash->hash == NULL) | |
401 | return -ENOMEM; | |
402 | clhash->hashsize = size; | |
403 | clhash->hashmask = size - 1; | |
404 | clhash->hashelems = 0; | |
405 | return 0; | |
406 | } | |
407 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
408 | ||
409 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
410 | { | |
411 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
412 | } | |
413 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
414 | ||
415 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
416 | struct Qdisc_class_common *cl) | |
417 | { | |
418 | unsigned int h; | |
419 | ||
420 | INIT_HLIST_NODE(&cl->hnode); | |
421 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
422 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
423 | clhash->hashelems++; | |
424 | } | |
425 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
426 | ||
427 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
428 | struct Qdisc_class_common *cl) | |
429 | { | |
430 | hlist_del(&cl->hnode); | |
431 | clhash->hashelems--; | |
432 | } | |
433 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
434 | ||
1da177e4 LT |
435 | /* Allocate an unique handle from space managed by kernel */ |
436 | ||
437 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
438 | { | |
439 | int i = 0x10000; | |
440 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
441 | ||
442 | do { | |
443 | autohandle += TC_H_MAKE(0x10000U, 0); | |
444 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
445 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
446 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
447 | ||
448 | return i>0 ? autohandle : 0; | |
449 | } | |
450 | ||
451 | /* Attach toplevel qdisc to device dev */ | |
452 | ||
453 | static struct Qdisc * | |
454 | dev_graft_qdisc(struct net_device *dev, struct Qdisc *qdisc) | |
455 | { | |
b0e1e646 | 456 | struct netdev_queue *dev_queue; |
1da177e4 LT |
457 | struct Qdisc *oqdisc; |
458 | ||
459 | if (dev->flags & IFF_UP) | |
460 | dev_deactivate(dev); | |
461 | ||
462 | qdisc_lock_tree(dev); | |
463 | if (qdisc && qdisc->flags&TCQ_F_INGRESS) { | |
816f3258 DM |
464 | dev_queue = &dev->rx_queue; |
465 | oqdisc = dev_queue->qdisc; | |
1da177e4 LT |
466 | /* Prune old scheduler */ |
467 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) { | |
468 | /* delete */ | |
469 | qdisc_reset(oqdisc); | |
816f3258 | 470 | dev_queue->qdisc = NULL; |
1da177e4 | 471 | } else { /* new */ |
816f3258 | 472 | dev_queue->qdisc = qdisc; |
1da177e4 LT |
473 | } |
474 | ||
475 | } else { | |
e8a0464c | 476 | dev_queue = netdev_get_tx_queue(dev, 0); |
b0e1e646 | 477 | oqdisc = dev_queue->qdisc_sleeping; |
1da177e4 LT |
478 | |
479 | /* Prune old scheduler */ | |
480 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
481 | qdisc_reset(oqdisc); | |
482 | ||
483 | /* ... and graft new one */ | |
484 | if (qdisc == NULL) | |
485 | qdisc = &noop_qdisc; | |
b0e1e646 DM |
486 | dev_queue->qdisc_sleeping = qdisc; |
487 | dev_queue->qdisc = &noop_qdisc; | |
1da177e4 LT |
488 | } |
489 | ||
490 | qdisc_unlock_tree(dev); | |
491 | ||
492 | if (dev->flags & IFF_UP) | |
493 | dev_activate(dev); | |
494 | ||
495 | return oqdisc; | |
496 | } | |
497 | ||
43effa1e PM |
498 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
499 | { | |
20fea08b | 500 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
501 | unsigned long cl; |
502 | u32 parentid; | |
503 | ||
504 | if (n == 0) | |
505 | return; | |
506 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
507 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
508 | return; | |
509 | ||
5ce2d488 | 510 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
511 | if (sch == NULL) { |
512 | WARN_ON(parentid != TC_H_ROOT); | |
513 | return; | |
514 | } | |
43effa1e PM |
515 | cops = sch->ops->cl_ops; |
516 | if (cops->qlen_notify) { | |
517 | cl = cops->get(sch, parentid); | |
518 | cops->qlen_notify(sch, cl); | |
519 | cops->put(sch, cl); | |
520 | } | |
521 | sch->q.qlen -= n; | |
522 | } | |
523 | } | |
524 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 LT |
525 | |
526 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
527 | to device "dev". | |
528 | ||
529 | Old qdisc is not destroyed but returned in *old. | |
530 | */ | |
531 | ||
532 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
533 | u32 classid, | |
534 | struct Qdisc *new, struct Qdisc **old) | |
535 | { | |
536 | int err = 0; | |
537 | struct Qdisc *q = *old; | |
538 | ||
539 | ||
10297b99 | 540 | if (parent == NULL) { |
1da177e4 LT |
541 | if (q && q->flags&TCQ_F_INGRESS) { |
542 | *old = dev_graft_qdisc(dev, q); | |
543 | } else { | |
544 | *old = dev_graft_qdisc(dev, new); | |
545 | } | |
546 | } else { | |
20fea08b | 547 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 LT |
548 | |
549 | err = -EINVAL; | |
550 | ||
551 | if (cops) { | |
552 | unsigned long cl = cops->get(parent, classid); | |
553 | if (cl) { | |
554 | err = cops->graft(parent, cl, new, old); | |
1da177e4 LT |
555 | cops->put(parent, cl); |
556 | } | |
557 | } | |
558 | } | |
559 | return err; | |
560 | } | |
561 | ||
562 | /* | |
563 | Allocate and initialize new qdisc. | |
564 | ||
565 | Parameters are passed via opt. | |
566 | */ | |
567 | ||
568 | static struct Qdisc * | |
bb949fbd DM |
569 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
570 | u32 parent, u32 handle, struct nlattr **tca, int *errp) | |
1da177e4 LT |
571 | { |
572 | int err; | |
1e90474c | 573 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
574 | struct Qdisc *sch; |
575 | struct Qdisc_ops *ops; | |
1da177e4 LT |
576 | |
577 | ops = qdisc_lookup_ops(kind); | |
578 | #ifdef CONFIG_KMOD | |
579 | if (ops == NULL && kind != NULL) { | |
580 | char name[IFNAMSIZ]; | |
1e90474c | 581 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
582 | /* We dropped the RTNL semaphore in order to |
583 | * perform the module load. So, even if we | |
584 | * succeeded in loading the module we have to | |
585 | * tell the caller to replay the request. We | |
586 | * indicate this using -EAGAIN. | |
587 | * We replay the request because the device may | |
588 | * go away in the mean time. | |
589 | */ | |
590 | rtnl_unlock(); | |
591 | request_module("sch_%s", name); | |
592 | rtnl_lock(); | |
593 | ops = qdisc_lookup_ops(kind); | |
594 | if (ops != NULL) { | |
595 | /* We will try again qdisc_lookup_ops, | |
596 | * so don't keep a reference. | |
597 | */ | |
598 | module_put(ops->owner); | |
599 | err = -EAGAIN; | |
600 | goto err_out; | |
601 | } | |
602 | } | |
603 | } | |
604 | #endif | |
605 | ||
b9e2cc0f | 606 | err = -ENOENT; |
1da177e4 LT |
607 | if (ops == NULL) |
608 | goto err_out; | |
609 | ||
5ce2d488 | 610 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
611 | if (IS_ERR(sch)) { |
612 | err = PTR_ERR(sch); | |
1da177e4 | 613 | goto err_out2; |
3d54b82f | 614 | } |
1da177e4 | 615 | |
ffc8fefa PM |
616 | sch->parent = parent; |
617 | ||
3d54b82f | 618 | if (handle == TC_H_INGRESS) { |
1da177e4 | 619 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 620 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
fd44de7c | 621 | } else { |
fd44de7c PM |
622 | if (handle == 0) { |
623 | handle = qdisc_alloc_handle(dev); | |
624 | err = -ENOMEM; | |
625 | if (handle == 0) | |
626 | goto err_out3; | |
627 | } | |
1da177e4 LT |
628 | } |
629 | ||
3d54b82f | 630 | sch->handle = handle; |
1da177e4 | 631 | |
1e90474c PM |
632 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
633 | if (tca[TCA_RATE]) { | |
023e09a7 | 634 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
7698b4fc | 635 | qdisc_root_lock(sch), |
1e90474c | 636 | tca[TCA_RATE]); |
023e09a7 TG |
637 | if (err) { |
638 | /* | |
639 | * Any broken qdiscs that would require | |
640 | * a ops->reset() here? The qdisc was never | |
641 | * in action so it shouldn't be necessary. | |
642 | */ | |
643 | if (ops->destroy) | |
644 | ops->destroy(sch); | |
645 | goto err_out3; | |
646 | } | |
647 | } | |
1da177e4 | 648 | qdisc_lock_tree(dev); |
b0e1e646 | 649 | list_add_tail(&sch->list, &dev_queue->qdisc_list); |
1da177e4 LT |
650 | qdisc_unlock_tree(dev); |
651 | ||
1da177e4 LT |
652 | return sch; |
653 | } | |
654 | err_out3: | |
655 | dev_put(dev); | |
3d54b82f | 656 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
657 | err_out2: |
658 | module_put(ops->owner); | |
659 | err_out: | |
660 | *errp = err; | |
1da177e4 LT |
661 | return NULL; |
662 | } | |
663 | ||
1e90474c | 664 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 665 | { |
1e90474c | 666 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
667 | int err; |
668 | ||
669 | if (sch->ops->change == NULL) | |
670 | return -EINVAL; | |
1e90474c | 671 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
672 | if (err) |
673 | return err; | |
674 | } | |
1e90474c | 675 | if (tca[TCA_RATE]) |
1da177e4 | 676 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
7698b4fc | 677 | qdisc_root_lock(sch), tca[TCA_RATE]); |
1da177e4 LT |
678 | return 0; |
679 | } | |
680 | ||
681 | struct check_loop_arg | |
682 | { | |
683 | struct qdisc_walker w; | |
684 | struct Qdisc *p; | |
685 | int depth; | |
686 | }; | |
687 | ||
688 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
689 | ||
690 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
691 | { | |
692 | struct check_loop_arg arg; | |
693 | ||
694 | if (q->ops->cl_ops == NULL) | |
695 | return 0; | |
696 | ||
697 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
698 | arg.w.fn = check_loop_fn; | |
699 | arg.depth = depth; | |
700 | arg.p = p; | |
701 | q->ops->cl_ops->walk(q, &arg.w); | |
702 | return arg.w.stop ? -ELOOP : 0; | |
703 | } | |
704 | ||
705 | static int | |
706 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
707 | { | |
708 | struct Qdisc *leaf; | |
20fea08b | 709 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
710 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
711 | ||
712 | leaf = cops->leaf(q, cl); | |
713 | if (leaf) { | |
714 | if (leaf == arg->p || arg->depth > 7) | |
715 | return -ELOOP; | |
716 | return check_loop(leaf, arg->p, arg->depth + 1); | |
717 | } | |
718 | return 0; | |
719 | } | |
720 | ||
721 | /* | |
722 | * Delete/get qdisc. | |
723 | */ | |
724 | ||
725 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
726 | { | |
3b1e0a65 | 727 | struct net *net = sock_net(skb->sk); |
1da177e4 | 728 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 729 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
730 | struct net_device *dev; |
731 | u32 clid = tcm->tcm_parent; | |
732 | struct Qdisc *q = NULL; | |
733 | struct Qdisc *p = NULL; | |
734 | int err; | |
735 | ||
b854272b DL |
736 | if (net != &init_net) |
737 | return -EINVAL; | |
738 | ||
881d966b | 739 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
740 | return -ENODEV; |
741 | ||
1e90474c PM |
742 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
743 | if (err < 0) | |
744 | return err; | |
745 | ||
1da177e4 LT |
746 | if (clid) { |
747 | if (clid != TC_H_ROOT) { | |
748 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
749 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
750 | return -ENOENT; | |
751 | q = qdisc_leaf(p, clid); | |
752 | } else { /* ingress */ | |
816f3258 | 753 | q = dev->rx_queue.qdisc; |
10297b99 | 754 | } |
1da177e4 | 755 | } else { |
e8a0464c DM |
756 | struct netdev_queue *dev_queue; |
757 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 758 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
759 | } |
760 | if (!q) | |
761 | return -ENOENT; | |
762 | ||
763 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
764 | return -EINVAL; | |
765 | } else { | |
766 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
767 | return -ENOENT; | |
768 | } | |
769 | ||
1e90474c | 770 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
771 | return -EINVAL; |
772 | ||
773 | if (n->nlmsg_type == RTM_DELQDISC) { | |
774 | if (!clid) | |
775 | return -EINVAL; | |
776 | if (q->handle == 0) | |
777 | return -ENOENT; | |
778 | if ((err = qdisc_graft(dev, p, clid, NULL, &q)) != 0) | |
779 | return err; | |
780 | if (q) { | |
781 | qdisc_notify(skb, n, clid, q, NULL); | |
fd44de7c | 782 | qdisc_lock_tree(dev); |
1da177e4 | 783 | qdisc_destroy(q); |
fd44de7c | 784 | qdisc_unlock_tree(dev); |
1da177e4 LT |
785 | } |
786 | } else { | |
787 | qdisc_notify(skb, n, clid, NULL, q); | |
788 | } | |
789 | return 0; | |
790 | } | |
791 | ||
792 | /* | |
793 | Create/change qdisc. | |
794 | */ | |
795 | ||
796 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
797 | { | |
3b1e0a65 | 798 | struct net *net = sock_net(skb->sk); |
1da177e4 | 799 | struct tcmsg *tcm; |
1e90474c | 800 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
801 | struct net_device *dev; |
802 | u32 clid; | |
803 | struct Qdisc *q, *p; | |
804 | int err; | |
805 | ||
b854272b DL |
806 | if (net != &init_net) |
807 | return -EINVAL; | |
808 | ||
1da177e4 LT |
809 | replay: |
810 | /* Reinit, just in case something touches this. */ | |
811 | tcm = NLMSG_DATA(n); | |
1da177e4 LT |
812 | clid = tcm->tcm_parent; |
813 | q = p = NULL; | |
814 | ||
881d966b | 815 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
816 | return -ENODEV; |
817 | ||
1e90474c PM |
818 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
819 | if (err < 0) | |
820 | return err; | |
821 | ||
1da177e4 LT |
822 | if (clid) { |
823 | if (clid != TC_H_ROOT) { | |
824 | if (clid != TC_H_INGRESS) { | |
825 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
826 | return -ENOENT; | |
827 | q = qdisc_leaf(p, clid); | |
828 | } else { /*ingress */ | |
816f3258 | 829 | q = dev->rx_queue.qdisc; |
1da177e4 LT |
830 | } |
831 | } else { | |
e8a0464c DM |
832 | struct netdev_queue *dev_queue; |
833 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 834 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
835 | } |
836 | ||
837 | /* It may be default qdisc, ignore it */ | |
838 | if (q && q->handle == 0) | |
839 | q = NULL; | |
840 | ||
841 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
842 | if (tcm->tcm_handle) { | |
843 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
844 | return -EEXIST; | |
845 | if (TC_H_MIN(tcm->tcm_handle)) | |
846 | return -EINVAL; | |
847 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
848 | goto create_n_graft; | |
849 | if (n->nlmsg_flags&NLM_F_EXCL) | |
850 | return -EEXIST; | |
1e90474c | 851 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
852 | return -EINVAL; |
853 | if (q == p || | |
854 | (p && check_loop(q, p, 0))) | |
855 | return -ELOOP; | |
856 | atomic_inc(&q->refcnt); | |
857 | goto graft; | |
858 | } else { | |
859 | if (q == NULL) | |
860 | goto create_n_graft; | |
861 | ||
862 | /* This magic test requires explanation. | |
863 | * | |
864 | * We know, that some child q is already | |
865 | * attached to this parent and have choice: | |
866 | * either to change it or to create/graft new one. | |
867 | * | |
868 | * 1. We are allowed to create/graft only | |
869 | * if CREATE and REPLACE flags are set. | |
870 | * | |
871 | * 2. If EXCL is set, requestor wanted to say, | |
872 | * that qdisc tcm_handle is not expected | |
873 | * to exist, so that we choose create/graft too. | |
874 | * | |
875 | * 3. The last case is when no flags are set. | |
876 | * Alas, it is sort of hole in API, we | |
877 | * cannot decide what to do unambiguously. | |
878 | * For now we select create/graft, if | |
879 | * user gave KIND, which does not match existing. | |
880 | */ | |
881 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
882 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
883 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
1e90474c PM |
884 | (tca[TCA_KIND] && |
885 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
886 | goto create_n_graft; |
887 | } | |
888 | } | |
889 | } else { | |
890 | if (!tcm->tcm_handle) | |
891 | return -EINVAL; | |
892 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
893 | } | |
894 | ||
895 | /* Change qdisc parameters */ | |
896 | if (q == NULL) | |
897 | return -ENOENT; | |
898 | if (n->nlmsg_flags&NLM_F_EXCL) | |
899 | return -EEXIST; | |
1e90474c | 900 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
901 | return -EINVAL; |
902 | err = qdisc_change(q, tca); | |
903 | if (err == 0) | |
904 | qdisc_notify(skb, n, clid, NULL, q); | |
905 | return err; | |
906 | ||
907 | create_n_graft: | |
908 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
909 | return -ENOENT; | |
910 | if (clid == TC_H_INGRESS) | |
bb949fbd DM |
911 | q = qdisc_create(dev, &dev->rx_queue, |
912 | tcm->tcm_parent, tcm->tcm_parent, | |
ffc8fefa | 913 | tca, &err); |
10297b99 | 914 | else |
e8a0464c | 915 | q = qdisc_create(dev, netdev_get_tx_queue(dev, 0), |
bb949fbd | 916 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 917 | tca, &err); |
1da177e4 LT |
918 | if (q == NULL) { |
919 | if (err == -EAGAIN) | |
920 | goto replay; | |
921 | return err; | |
922 | } | |
923 | ||
924 | graft: | |
925 | if (1) { | |
926 | struct Qdisc *old_q = NULL; | |
927 | err = qdisc_graft(dev, p, clid, q, &old_q); | |
928 | if (err) { | |
929 | if (q) { | |
fd44de7c | 930 | qdisc_lock_tree(dev); |
1da177e4 | 931 | qdisc_destroy(q); |
fd44de7c | 932 | qdisc_unlock_tree(dev); |
1da177e4 LT |
933 | } |
934 | return err; | |
935 | } | |
936 | qdisc_notify(skb, n, clid, old_q, q); | |
937 | if (old_q) { | |
fd44de7c | 938 | qdisc_lock_tree(dev); |
1da177e4 | 939 | qdisc_destroy(old_q); |
fd44de7c | 940 | qdisc_unlock_tree(dev); |
1da177e4 LT |
941 | } |
942 | } | |
943 | return 0; | |
944 | } | |
945 | ||
946 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 947 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
948 | { |
949 | struct tcmsg *tcm; | |
950 | struct nlmsghdr *nlh; | |
27a884dc | 951 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
952 | struct gnet_dump d; |
953 | ||
e431b8c0 | 954 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
955 | tcm = NLMSG_DATA(nlh); |
956 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
957 | tcm->tcm__pad1 = 0; |
958 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 959 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
960 | tcm->tcm_parent = clid; |
961 | tcm->tcm_handle = q->handle; | |
962 | tcm->tcm_info = atomic_read(&q->refcnt); | |
57e1c487 | 963 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 964 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 965 | goto nla_put_failure; |
1da177e4 LT |
966 | q->qstats.qlen = q->q.qlen; |
967 | ||
968 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, | |
7698b4fc | 969 | TCA_XSTATS, qdisc_root_lock(q), &d) < 0) |
1e90474c | 970 | goto nla_put_failure; |
1da177e4 LT |
971 | |
972 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 973 | goto nla_put_failure; |
1da177e4 LT |
974 | |
975 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
1da177e4 | 976 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
1da177e4 | 977 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 978 | goto nla_put_failure; |
10297b99 | 979 | |
1da177e4 | 980 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 981 | goto nla_put_failure; |
10297b99 | 982 | |
27a884dc | 983 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
984 | return skb->len; |
985 | ||
986 | nlmsg_failure: | |
1e90474c | 987 | nla_put_failure: |
dc5fc579 | 988 | nlmsg_trim(skb, b); |
1da177e4 LT |
989 | return -1; |
990 | } | |
991 | ||
992 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
993 | u32 clid, struct Qdisc *old, struct Qdisc *new) | |
994 | { | |
995 | struct sk_buff *skb; | |
996 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
997 | ||
998 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
999 | if (!skb) | |
1000 | return -ENOBUFS; | |
1001 | ||
1002 | if (old && old->handle) { | |
1003 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) | |
1004 | goto err_out; | |
1005 | } | |
1006 | if (new) { | |
1007 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
1008 | goto err_out; | |
1009 | } | |
1010 | ||
1011 | if (skb->len) | |
97c53cac | 1012 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1013 | |
1014 | err_out: | |
1015 | kfree_skb(skb); | |
1016 | return -EINVAL; | |
1017 | } | |
1018 | ||
1019 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) | |
1020 | { | |
3b1e0a65 | 1021 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1022 | int idx, q_idx; |
1023 | int s_idx, s_q_idx; | |
1024 | struct net_device *dev; | |
1025 | struct Qdisc *q; | |
1026 | ||
b854272b DL |
1027 | if (net != &init_net) |
1028 | return 0; | |
1029 | ||
1da177e4 LT |
1030 | s_idx = cb->args[0]; |
1031 | s_q_idx = q_idx = cb->args[1]; | |
1032 | read_lock(&dev_base_lock); | |
7562f876 | 1033 | idx = 0; |
881d966b | 1034 | for_each_netdev(&init_net, dev) { |
b0e1e646 | 1035 | struct netdev_queue *dev_queue; |
1da177e4 | 1036 | if (idx < s_idx) |
7562f876 | 1037 | goto cont; |
1da177e4 LT |
1038 | if (idx > s_idx) |
1039 | s_q_idx = 0; | |
1da177e4 | 1040 | q_idx = 0; |
e8a0464c | 1041 | dev_queue = netdev_get_tx_queue(dev, 0); |
b0e1e646 | 1042 | list_for_each_entry(q, &dev_queue->qdisc_list, list) { |
1da177e4 LT |
1043 | if (q_idx < s_q_idx) { |
1044 | q_idx++; | |
1045 | continue; | |
1046 | } | |
1047 | if (tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
0463d4ae | 1048 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1da177e4 | 1049 | goto done; |
1da177e4 LT |
1050 | q_idx++; |
1051 | } | |
7562f876 PE |
1052 | cont: |
1053 | idx++; | |
1da177e4 LT |
1054 | } |
1055 | ||
1056 | done: | |
1057 | read_unlock(&dev_base_lock); | |
1058 | ||
1059 | cb->args[0] = idx; | |
1060 | cb->args[1] = q_idx; | |
1061 | ||
1062 | return skb->len; | |
1063 | } | |
1064 | ||
1065 | ||
1066 | ||
1067 | /************************************************ | |
1068 | * Traffic classes manipulation. * | |
1069 | ************************************************/ | |
1070 | ||
1071 | ||
1072 | ||
1073 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1074 | { | |
3b1e0a65 | 1075 | struct net *net = sock_net(skb->sk); |
b0e1e646 | 1076 | struct netdev_queue *dev_queue; |
1da177e4 | 1077 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 1078 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1079 | struct net_device *dev; |
1080 | struct Qdisc *q = NULL; | |
20fea08b | 1081 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1082 | unsigned long cl = 0; |
1083 | unsigned long new_cl; | |
1084 | u32 pid = tcm->tcm_parent; | |
1085 | u32 clid = tcm->tcm_handle; | |
1086 | u32 qid = TC_H_MAJ(clid); | |
1087 | int err; | |
1088 | ||
b854272b DL |
1089 | if (net != &init_net) |
1090 | return -EINVAL; | |
1091 | ||
881d966b | 1092 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1093 | return -ENODEV; |
1094 | ||
1e90474c PM |
1095 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1096 | if (err < 0) | |
1097 | return err; | |
1098 | ||
1da177e4 LT |
1099 | /* |
1100 | parent == TC_H_UNSPEC - unspecified parent. | |
1101 | parent == TC_H_ROOT - class is root, which has no parent. | |
1102 | parent == X:0 - parent is root class. | |
1103 | parent == X:Y - parent is a node in hierarchy. | |
1104 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1105 | ||
1106 | handle == 0:0 - generate handle from kernel pool. | |
1107 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1108 | handle == X:Y - clear. | |
1109 | handle == X:0 - root class. | |
1110 | */ | |
1111 | ||
1112 | /* Step 1. Determine qdisc handle X:0 */ | |
1113 | ||
e8a0464c | 1114 | dev_queue = netdev_get_tx_queue(dev, 0); |
1da177e4 LT |
1115 | if (pid != TC_H_ROOT) { |
1116 | u32 qid1 = TC_H_MAJ(pid); | |
1117 | ||
1118 | if (qid && qid1) { | |
1119 | /* If both majors are known, they must be identical. */ | |
1120 | if (qid != qid1) | |
1121 | return -EINVAL; | |
1122 | } else if (qid1) { | |
1123 | qid = qid1; | |
1124 | } else if (qid == 0) | |
b0e1e646 | 1125 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1126 | |
1127 | /* Now qid is genuine qdisc handle consistent | |
1128 | both with parent and child. | |
1129 | ||
1130 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
1131 | */ | |
1132 | if (pid) | |
1133 | pid = TC_H_MAKE(qid, pid); | |
1134 | } else { | |
1135 | if (qid == 0) | |
b0e1e646 | 1136 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1137 | } |
1138 | ||
1139 | /* OK. Locate qdisc */ | |
10297b99 | 1140 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
1da177e4 LT |
1141 | return -ENOENT; |
1142 | ||
1143 | /* An check that it supports classes */ | |
1144 | cops = q->ops->cl_ops; | |
1145 | if (cops == NULL) | |
1146 | return -EINVAL; | |
1147 | ||
1148 | /* Now try to get class */ | |
1149 | if (clid == 0) { | |
1150 | if (pid == TC_H_ROOT) | |
1151 | clid = qid; | |
1152 | } else | |
1153 | clid = TC_H_MAKE(qid, clid); | |
1154 | ||
1155 | if (clid) | |
1156 | cl = cops->get(q, clid); | |
1157 | ||
1158 | if (cl == 0) { | |
1159 | err = -ENOENT; | |
1160 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
1161 | goto out; | |
1162 | } else { | |
1163 | switch (n->nlmsg_type) { | |
10297b99 | 1164 | case RTM_NEWTCLASS: |
1da177e4 LT |
1165 | err = -EEXIST; |
1166 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1167 | goto out; | |
1168 | break; | |
1169 | case RTM_DELTCLASS: | |
1170 | err = cops->delete(q, cl); | |
1171 | if (err == 0) | |
1172 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); | |
1173 | goto out; | |
1174 | case RTM_GETTCLASS: | |
1175 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); | |
1176 | goto out; | |
1177 | default: | |
1178 | err = -EINVAL; | |
1179 | goto out; | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | new_cl = cl; | |
1184 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1185 | if (err == 0) | |
1186 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); | |
1187 | ||
1188 | out: | |
1189 | if (cl) | |
1190 | cops->put(q, cl); | |
1191 | ||
1192 | return err; | |
1193 | } | |
1194 | ||
1195 | ||
1196 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1197 | unsigned long cl, | |
e431b8c0 | 1198 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1199 | { |
1200 | struct tcmsg *tcm; | |
1201 | struct nlmsghdr *nlh; | |
27a884dc | 1202 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1203 | struct gnet_dump d; |
20fea08b | 1204 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1205 | |
e431b8c0 | 1206 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1207 | tcm = NLMSG_DATA(nlh); |
1208 | tcm->tcm_family = AF_UNSPEC; | |
5ce2d488 | 1209 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1210 | tcm->tcm_parent = q->handle; |
1211 | tcm->tcm_handle = q->handle; | |
1212 | tcm->tcm_info = 0; | |
57e1c487 | 1213 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1214 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1215 | goto nla_put_failure; |
1da177e4 LT |
1216 | |
1217 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, | |
7698b4fc | 1218 | TCA_XSTATS, qdisc_root_lock(q), &d) < 0) |
1e90474c | 1219 | goto nla_put_failure; |
1da177e4 LT |
1220 | |
1221 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1222 | goto nla_put_failure; |
1da177e4 LT |
1223 | |
1224 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1225 | goto nla_put_failure; |
1da177e4 | 1226 | |
27a884dc | 1227 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1228 | return skb->len; |
1229 | ||
1230 | nlmsg_failure: | |
1e90474c | 1231 | nla_put_failure: |
dc5fc579 | 1232 | nlmsg_trim(skb, b); |
1da177e4 LT |
1233 | return -1; |
1234 | } | |
1235 | ||
1236 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1237 | struct Qdisc *q, unsigned long cl, int event) | |
1238 | { | |
1239 | struct sk_buff *skb; | |
1240 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1241 | ||
1242 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1243 | if (!skb) | |
1244 | return -ENOBUFS; | |
1245 | ||
1246 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1247 | kfree_skb(skb); | |
1248 | return -EINVAL; | |
1249 | } | |
1250 | ||
97c53cac | 1251 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1252 | } |
1253 | ||
1254 | struct qdisc_dump_args | |
1255 | { | |
1256 | struct qdisc_walker w; | |
1257 | struct sk_buff *skb; | |
1258 | struct netlink_callback *cb; | |
1259 | }; | |
1260 | ||
1261 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1262 | { | |
1263 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1264 | ||
1265 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1266 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1267 | } | |
1268 | ||
1269 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) | |
1270 | { | |
3b1e0a65 | 1271 | struct net *net = sock_net(skb->sk); |
b0e1e646 | 1272 | struct netdev_queue *dev_queue; |
1da177e4 LT |
1273 | int t; |
1274 | int s_t; | |
1275 | struct net_device *dev; | |
1276 | struct Qdisc *q; | |
1277 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); | |
1278 | struct qdisc_dump_args arg; | |
1279 | ||
b854272b DL |
1280 | if (net != &init_net) |
1281 | return 0; | |
1282 | ||
1da177e4 LT |
1283 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
1284 | return 0; | |
881d966b | 1285 | if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1286 | return 0; |
1287 | ||
1288 | s_t = cb->args[0]; | |
1289 | t = 0; | |
1290 | ||
e8a0464c | 1291 | dev_queue = netdev_get_tx_queue(dev, 0); |
b0e1e646 | 1292 | list_for_each_entry(q, &dev_queue->qdisc_list, list) { |
1da177e4 LT |
1293 | if (t < s_t || !q->ops->cl_ops || |
1294 | (tcm->tcm_parent && | |
1295 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1296 | t++; | |
1297 | continue; | |
1298 | } | |
1299 | if (t > s_t) | |
1300 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1301 | arg.w.fn = qdisc_class_dump; | |
1302 | arg.skb = skb; | |
1303 | arg.cb = cb; | |
1304 | arg.w.stop = 0; | |
1305 | arg.w.skip = cb->args[1]; | |
1306 | arg.w.count = 0; | |
1307 | q->ops->cl_ops->walk(q, &arg.w); | |
1308 | cb->args[1] = arg.w.count; | |
1309 | if (arg.w.stop) | |
1310 | break; | |
1311 | t++; | |
1312 | } | |
1da177e4 LT |
1313 | |
1314 | cb->args[0] = t; | |
1315 | ||
1316 | dev_put(dev); | |
1317 | return skb->len; | |
1318 | } | |
1319 | ||
1320 | /* Main classifier routine: scans classifier chain attached | |
1321 | to this qdisc, (optionally) tests for protocol and asks | |
1322 | specific classifiers. | |
1323 | */ | |
73ca4918 PM |
1324 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1325 | struct tcf_result *res) | |
1326 | { | |
1327 | __be16 protocol = skb->protocol; | |
1328 | int err = 0; | |
1329 | ||
1330 | for (; tp; tp = tp->next) { | |
1331 | if ((tp->protocol == protocol || | |
1332 | tp->protocol == htons(ETH_P_ALL)) && | |
1333 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1334 | #ifdef CONFIG_NET_CLS_ACT | |
1335 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1336 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1337 | #endif | |
1338 | return err; | |
1339 | } | |
1340 | } | |
1341 | return -1; | |
1342 | } | |
1343 | EXPORT_SYMBOL(tc_classify_compat); | |
1344 | ||
1da177e4 | 1345 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1346 | struct tcf_result *res) |
1da177e4 LT |
1347 | { |
1348 | int err = 0; | |
73ca4918 | 1349 | __be16 protocol; |
1da177e4 LT |
1350 | #ifdef CONFIG_NET_CLS_ACT |
1351 | struct tcf_proto *otp = tp; | |
1352 | reclassify: | |
1353 | #endif | |
1354 | protocol = skb->protocol; | |
1355 | ||
73ca4918 | 1356 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1357 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1358 | if (err == TC_ACT_RECLASSIFY) { |
1359 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1360 | tp = otp; | |
1361 | ||
1362 | if (verd++ >= MAX_REC_LOOP) { | |
1363 | printk("rule prio %u protocol %02x reclassify loop, " | |
1364 | "packet dropped\n", | |
1365 | tp->prio&0xffff, ntohs(tp->protocol)); | |
1366 | return TC_ACT_SHOT; | |
1da177e4 | 1367 | } |
73ca4918 PM |
1368 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1369 | goto reclassify; | |
1da177e4 | 1370 | } |
73ca4918 PM |
1371 | #endif |
1372 | return err; | |
1da177e4 | 1373 | } |
73ca4918 | 1374 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1375 | |
a48b5a61 PM |
1376 | void tcf_destroy(struct tcf_proto *tp) |
1377 | { | |
1378 | tp->ops->destroy(tp); | |
1379 | module_put(tp->ops->owner); | |
1380 | kfree(tp); | |
1381 | } | |
1382 | ||
ff31ab56 | 1383 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1384 | { |
1385 | struct tcf_proto *tp; | |
1386 | ||
ff31ab56 PM |
1387 | while ((tp = *fl) != NULL) { |
1388 | *fl = tp->next; | |
a48b5a61 PM |
1389 | tcf_destroy(tp); |
1390 | } | |
1391 | } | |
1392 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1393 | ||
1da177e4 LT |
1394 | #ifdef CONFIG_PROC_FS |
1395 | static int psched_show(struct seq_file *seq, void *v) | |
1396 | { | |
3c0cfc13 PM |
1397 | struct timespec ts; |
1398 | ||
1399 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1400 | seq_printf(seq, "%08x %08x %08x %08x\n", |
641b9e0e | 1401 | (u32)NSEC_PER_USEC, (u32)PSCHED_US2NS(1), |
514bca32 | 1402 | 1000000, |
3c0cfc13 | 1403 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1404 | |
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | static int psched_open(struct inode *inode, struct file *file) | |
1409 | { | |
1410 | return single_open(file, psched_show, PDE(inode)->data); | |
1411 | } | |
1412 | ||
da7071d7 | 1413 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1414 | .owner = THIS_MODULE, |
1415 | .open = psched_open, | |
1416 | .read = seq_read, | |
1417 | .llseek = seq_lseek, | |
1418 | .release = single_release, | |
10297b99 | 1419 | }; |
1da177e4 LT |
1420 | #endif |
1421 | ||
1da177e4 LT |
1422 | static int __init pktsched_init(void) |
1423 | { | |
1da177e4 LT |
1424 | register_qdisc(&pfifo_qdisc_ops); |
1425 | register_qdisc(&bfifo_qdisc_ops); | |
457c4cbc | 1426 | proc_net_fops_create(&init_net, "psched", 0, &psched_fops); |
1da177e4 | 1427 | |
be577ddc TG |
1428 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
1429 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); | |
1430 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); | |
1431 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); | |
1432 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); | |
1433 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); | |
1434 | ||
1da177e4 LT |
1435 | return 0; |
1436 | } | |
1437 | ||
1438 | subsys_initcall(pktsched_init); |