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staging: vboxvideo: Remove vboxfb_create_object() wrapper
[linux/fpc-iii.git] / net / sched / sch_api.c
blob98541c6399db53f5d8ae46aee0f17cad7e0a127e
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
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/kernel.h>
21 #include <linux/string.h>
22 #include <linux/errno.h>
23 #include <linux/skbuff.h>
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>
29 #include <linux/hrtimer.h>
30 #include <linux/lockdep.h>
31 #include <linux/slab.h>
32 #include <linux/hashtable.h>
33
34 #include <net/net_namespace.h>
35 #include <net/sock.h>
36 #include <net/netlink.h>
37 #include <net/pkt_sched.h>
38 #include <net/pkt_cls.h>
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
94 Auxiliary routines:
95
96 ---peek
97
98 like dequeue but without removing a packet from the queue
99
100 ---reset
101
102 returns qdisc to initial state: purge all buffers, clear all
103 timers, counters (except for statistics) etc.
104
105 ---init
106
107 initializes newly created qdisc.
108
109 ---destroy
110
111 destroys resources allocated by init and during lifetime of qdisc.
112
113 ---change
114
115 changes qdisc parameters.
116 */
117
118 /* Protects list of registered TC modules. It is pure SMP lock. */
119 static DEFINE_RWLOCK(qdisc_mod_lock);
120
121
122 /************************************************
123 * Queueing disciplines manipulation. *
124 ************************************************/
125
126
127 /* The list of all installed queueing disciplines. */
128
129 static struct Qdisc_ops *qdisc_base;
130
131 /* Register/unregister queueing discipline */
132
133 int register_qdisc(struct Qdisc_ops *qops)
134 {
135 struct Qdisc_ops *q, **qp;
136 int rc = -EEXIST;
137
138 write_lock(&qdisc_mod_lock);
139 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
140 if (!strcmp(qops->id, q->id))
141 goto out;
142
143 if (qops->enqueue == NULL)
144 qops->enqueue = noop_qdisc_ops.enqueue;
145 if (qops->peek == NULL) {
146 if (qops->dequeue == NULL)
147 qops->peek = noop_qdisc_ops.peek;
148 else
149 goto out_einval;
150 }
151 if (qops->dequeue == NULL)
152 qops->dequeue = noop_qdisc_ops.dequeue;
153
154 if (qops->cl_ops) {
155 const struct Qdisc_class_ops *cops = qops->cl_ops;
156
157 if (!(cops->find && cops->walk && cops->leaf))
158 goto out_einval;
159
160 if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf))
161 goto out_einval;
162 }
163
164 qops->next = NULL;
165 *qp = qops;
166 rc = 0;
167 out:
168 write_unlock(&qdisc_mod_lock);
169 return rc;
170
171 out_einval:
172 rc = -EINVAL;
173 goto out;
174 }
175 EXPORT_SYMBOL(register_qdisc);
176
177 int unregister_qdisc(struct Qdisc_ops *qops)
178 {
179 struct Qdisc_ops *q, **qp;
180 int err = -ENOENT;
181
182 write_lock(&qdisc_mod_lock);
183 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
184 if (q == qops)
185 break;
186 if (q) {
187 *qp = q->next;
188 q->next = NULL;
189 err = 0;
190 }
191 write_unlock(&qdisc_mod_lock);
192 return err;
193 }
194 EXPORT_SYMBOL(unregister_qdisc);
195
196 /* Get default qdisc if not otherwise specified */
197 void qdisc_get_default(char *name, size_t len)
198 {
199 read_lock(&qdisc_mod_lock);
200 strlcpy(name, default_qdisc_ops->id, len);
201 read_unlock(&qdisc_mod_lock);
202 }
203
204 static struct Qdisc_ops *qdisc_lookup_default(const char *name)
205 {
206 struct Qdisc_ops *q = NULL;
207
208 for (q = qdisc_base; q; q = q->next) {
209 if (!strcmp(name, q->id)) {
210 if (!try_module_get(q->owner))
211 q = NULL;
212 break;
213 }
214 }
215
216 return q;
217 }
218
219 /* Set new default qdisc to use */
220 int qdisc_set_default(const char *name)
221 {
222 const struct Qdisc_ops *ops;
223
224 if (!capable(CAP_NET_ADMIN))
225 return -EPERM;
226
227 write_lock(&qdisc_mod_lock);
228 ops = qdisc_lookup_default(name);
229 if (!ops) {
230 /* Not found, drop lock and try to load module */
231 write_unlock(&qdisc_mod_lock);
232 request_module("sch_%s", name);
233 write_lock(&qdisc_mod_lock);
234
235 ops = qdisc_lookup_default(name);
236 }
237
238 if (ops) {
239 /* Set new default */
240 module_put(default_qdisc_ops->owner);
241 default_qdisc_ops = ops;
242 }
243 write_unlock(&qdisc_mod_lock);
244
245 return ops ? 0 : -ENOENT;
246 }
247
248 #ifdef CONFIG_NET_SCH_DEFAULT
249 /* Set default value from kernel config */
250 static int __init sch_default_qdisc(void)
251 {
252 return qdisc_set_default(CONFIG_DEFAULT_NET_SCH);
253 }
254 late_initcall(sch_default_qdisc);
255 #endif
256
257 /* We know handle. Find qdisc among all qdisc's attached to device
258 * (root qdisc, all its children, children of children etc.)
259 * Note: caller either uses rtnl or rcu_read_lock()
260 */
261
262 static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
263 {
264 struct Qdisc *q;
265
266 if (!qdisc_dev(root))
267 return (root->handle == handle ? root : NULL);
268
269 if (!(root->flags & TCQ_F_BUILTIN) &&
270 root->handle == handle)
271 return root;
272
273 hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) {
274 if (q->handle == handle)
275 return q;
276 }
277 return NULL;
278 }
279
280 void qdisc_hash_add(struct Qdisc *q, bool invisible)
281 {
282 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
283 ASSERT_RTNL();
284 hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle);
285 if (invisible)
286 q->flags |= TCQ_F_INVISIBLE;
287 }
288 }
289 EXPORT_SYMBOL(qdisc_hash_add);
290
291 void qdisc_hash_del(struct Qdisc *q)
292 {
293 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
294 ASSERT_RTNL();
295 hash_del_rcu(&q->hash);
296 }
297 }
298 EXPORT_SYMBOL(qdisc_hash_del);
299
300 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
301 {
302 struct Qdisc *q;
303
304 if (!handle)
305 return NULL;
306 q = qdisc_match_from_root(dev->qdisc, handle);
307 if (q)
308 goto out;
309
310 if (dev_ingress_queue(dev))
311 q = qdisc_match_from_root(
312 dev_ingress_queue(dev)->qdisc_sleeping,
313 handle);
314 out:
315 return q;
316 }
317
318 static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
319 {
320 unsigned long cl;
321 struct Qdisc *leaf;
322 const struct Qdisc_class_ops *cops = p->ops->cl_ops;
323
324 if (cops == NULL)
325 return NULL;
326 cl = cops->find(p, classid);
327
328 if (cl == 0)
329 return NULL;
330 leaf = cops->leaf(p, cl);
331 return leaf;
332 }
333
334 /* Find queueing discipline by name */
335
336 static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
337 {
338 struct Qdisc_ops *q = NULL;
339
340 if (kind) {
341 read_lock(&qdisc_mod_lock);
342 for (q = qdisc_base; q; q = q->next) {
343 if (nla_strcmp(kind, q->id) == 0) {
344 if (!try_module_get(q->owner))
345 q = NULL;
346 break;
347 }
348 }
349 read_unlock(&qdisc_mod_lock);
350 }
351 return q;
352 }
353
354 /* The linklayer setting were not transferred from iproute2, in older
355 * versions, and the rate tables lookup systems have been dropped in
356 * the kernel. To keep backward compatible with older iproute2 tc
357 * utils, we detect the linklayer setting by detecting if the rate
358 * table were modified.
359 *
360 * For linklayer ATM table entries, the rate table will be aligned to
361 * 48 bytes, thus some table entries will contain the same value. The
362 * mpu (min packet unit) is also encoded into the old rate table, thus
363 * starting from the mpu, we find low and high table entries for
364 * mapping this cell. If these entries contain the same value, when
365 * the rate tables have been modified for linklayer ATM.
366 *
367 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
368 * and then roundup to the next cell, calc the table entry one below,
369 * and compare.
370 */
371 static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
372 {
373 int low = roundup(r->mpu, 48);
374 int high = roundup(low+1, 48);
375 int cell_low = low >> r->cell_log;
376 int cell_high = (high >> r->cell_log) - 1;
377
378 /* rtab is too inaccurate at rates > 100Mbit/s */
379 if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
380 pr_debug("TC linklayer: Giving up ATM detection\n");
381 return TC_LINKLAYER_ETHERNET;
382 }
383
384 if ((cell_high > cell_low) && (cell_high < 256)
385 && (rtab[cell_low] == rtab[cell_high])) {
386 pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
387 cell_low, cell_high, rtab[cell_high]);
388 return TC_LINKLAYER_ATM;
389 }
390 return TC_LINKLAYER_ETHERNET;
391 }
392
393 static struct qdisc_rate_table *qdisc_rtab_list;
394
395 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
396 struct nlattr *tab,
397 struct netlink_ext_ack *extack)
398 {
399 struct qdisc_rate_table *rtab;
400
401 if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
402 nla_len(tab) != TC_RTAB_SIZE) {
403 NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching");
404 return NULL;
405 }
406
407 for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
408 if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) &&
409 !memcmp(&rtab->data, nla_data(tab), 1024)) {
410 rtab->refcnt++;
411 return rtab;
412 }
413 }
414
415 rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
416 if (rtab) {
417 rtab->rate = *r;
418 rtab->refcnt = 1;
419 memcpy(rtab->data, nla_data(tab), 1024);
420 if (r->linklayer == TC_LINKLAYER_UNAWARE)
421 r->linklayer = __detect_linklayer(r, rtab->data);
422 rtab->next = qdisc_rtab_list;
423 qdisc_rtab_list = rtab;
424 } else {
425 NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table");
426 }
427 return rtab;
428 }
429 EXPORT_SYMBOL(qdisc_get_rtab);
430
431 void qdisc_put_rtab(struct qdisc_rate_table *tab)
432 {
433 struct qdisc_rate_table *rtab, **rtabp;
434
435 if (!tab || --tab->refcnt)
436 return;
437
438 for (rtabp = &qdisc_rtab_list;
439 (rtab = *rtabp) != NULL;
440 rtabp = &rtab->next) {
441 if (rtab == tab) {
442 *rtabp = rtab->next;
443 kfree(rtab);
444 return;
445 }
446 }
447 }
448 EXPORT_SYMBOL(qdisc_put_rtab);
449
450 static LIST_HEAD(qdisc_stab_list);
451
452 static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
453 [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
454 [TCA_STAB_DATA] = { .type = NLA_BINARY },
455 };
456
457 static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt,
458 struct netlink_ext_ack *extack)
459 {
460 struct nlattr *tb[TCA_STAB_MAX + 1];
461 struct qdisc_size_table *stab;
462 struct tc_sizespec *s;
463 unsigned int tsize = 0;
464 u16 *tab = NULL;
465 int err;
466
467 err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, extack);
468 if (err < 0)
469 return ERR_PTR(err);
470 if (!tb[TCA_STAB_BASE]) {
471 NL_SET_ERR_MSG(extack, "Size table base attribute is missing");
472 return ERR_PTR(-EINVAL);
473 }
474
475 s = nla_data(tb[TCA_STAB_BASE]);
476
477 if (s->tsize > 0) {
478 if (!tb[TCA_STAB_DATA]) {
479 NL_SET_ERR_MSG(extack, "Size table data attribute is missing");
480 return ERR_PTR(-EINVAL);
481 }
482 tab = nla_data(tb[TCA_STAB_DATA]);
483 tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
484 }
485
486 if (tsize != s->tsize || (!tab && tsize > 0)) {
487 NL_SET_ERR_MSG(extack, "Invalid size of size table");
488 return ERR_PTR(-EINVAL);
489 }
490
491 list_for_each_entry(stab, &qdisc_stab_list, list) {
492 if (memcmp(&stab->szopts, s, sizeof(*s)))
493 continue;
494 if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
495 continue;
496 stab->refcnt++;
497 return stab;
498 }
499
500 stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
501 if (!stab)
502 return ERR_PTR(-ENOMEM);
503
504 stab->refcnt = 1;
505 stab->szopts = *s;
506 if (tsize > 0)
507 memcpy(stab->data, tab, tsize * sizeof(u16));
508
509 list_add_tail(&stab->list, &qdisc_stab_list);
510
511 return stab;
512 }
513
514 static void stab_kfree_rcu(struct rcu_head *head)
515 {
516 kfree(container_of(head, struct qdisc_size_table, rcu));
517 }
518
519 void qdisc_put_stab(struct qdisc_size_table *tab)
520 {
521 if (!tab)
522 return;
523
524 if (--tab->refcnt == 0) {
525 list_del(&tab->list);
526 call_rcu_bh(&tab->rcu, stab_kfree_rcu);
527 }
528 }
529 EXPORT_SYMBOL(qdisc_put_stab);
530
531 static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
532 {
533 struct nlattr *nest;
534
535 nest = nla_nest_start(skb, TCA_STAB);
536 if (nest == NULL)
537 goto nla_put_failure;
538 if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
539 goto nla_put_failure;
540 nla_nest_end(skb, nest);
541
542 return skb->len;
543
544 nla_put_failure:
545 return -1;
546 }
547
548 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
549 const struct qdisc_size_table *stab)
550 {
551 int pkt_len, slot;
552
553 pkt_len = skb->len + stab->szopts.overhead;
554 if (unlikely(!stab->szopts.tsize))
555 goto out;
556
557 slot = pkt_len + stab->szopts.cell_align;
558 if (unlikely(slot < 0))
559 slot = 0;
560
561 slot >>= stab->szopts.cell_log;
562 if (likely(slot < stab->szopts.tsize))
563 pkt_len = stab->data[slot];
564 else
565 pkt_len = stab->data[stab->szopts.tsize - 1] *
566 (slot / stab->szopts.tsize) +
567 stab->data[slot % stab->szopts.tsize];
568
569 pkt_len <<= stab->szopts.size_log;
570 out:
571 if (unlikely(pkt_len < 1))
572 pkt_len = 1;
573 qdisc_skb_cb(skb)->pkt_len = pkt_len;
574 }
575 EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
576
577 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc)
578 {
579 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
580 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
581 txt, qdisc->ops->id, qdisc->handle >> 16);
582 qdisc->flags |= TCQ_F_WARN_NONWC;
583 }
584 }
585 EXPORT_SYMBOL(qdisc_warn_nonwc);
586
587 static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
588 {
589 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
590 timer);
591
592 rcu_read_lock();
593 __netif_schedule(qdisc_root(wd->qdisc));
594 rcu_read_unlock();
595
596 return HRTIMER_NORESTART;
597 }
598
599 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
600 clockid_t clockid)
601 {
602 hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED);
603 wd->timer.function = qdisc_watchdog;
604 wd->qdisc = qdisc;
605 }
606 EXPORT_SYMBOL(qdisc_watchdog_init_clockid);
607
608 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
609 {
610 qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC);
611 }
612 EXPORT_SYMBOL(qdisc_watchdog_init);
613
614 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
615 {
616 if (test_bit(__QDISC_STATE_DEACTIVATED,
617 &qdisc_root_sleeping(wd->qdisc)->state))
618 return;
619
620 if (wd->last_expires == expires)
621 return;
622
623 wd->last_expires = expires;
624 hrtimer_start(&wd->timer,
625 ns_to_ktime(expires),
626 HRTIMER_MODE_ABS_PINNED);
627 }
628 EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);
629
630 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
631 {
632 hrtimer_cancel(&wd->timer);
633 }
634 EXPORT_SYMBOL(qdisc_watchdog_cancel);
635
636 static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
637 {
638 struct hlist_head *h;
639 unsigned int i;
640
641 h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL);
642
643 if (h != NULL) {
644 for (i = 0; i < n; i++)
645 INIT_HLIST_HEAD(&h[i]);
646 }
647 return h;
648 }
649
650 void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
651 {
652 struct Qdisc_class_common *cl;
653 struct hlist_node *next;
654 struct hlist_head *nhash, *ohash;
655 unsigned int nsize, nmask, osize;
656 unsigned int i, h;
657
658 /* Rehash when load factor exceeds 0.75 */
659 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
660 return;
661 nsize = clhash->hashsize * 2;
662 nmask = nsize - 1;
663 nhash = qdisc_class_hash_alloc(nsize);
664 if (nhash == NULL)
665 return;
666
667 ohash = clhash->hash;
668 osize = clhash->hashsize;
669
670 sch_tree_lock(sch);
671 for (i = 0; i < osize; i++) {
672 hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
673 h = qdisc_class_hash(cl->classid, nmask);
674 hlist_add_head(&cl->hnode, &nhash[h]);
675 }
676 }
677 clhash->hash = nhash;
678 clhash->hashsize = nsize;
679 clhash->hashmask = nmask;
680 sch_tree_unlock(sch);
681
682 kvfree(ohash);
683 }
684 EXPORT_SYMBOL(qdisc_class_hash_grow);
685
686 int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
687 {
688 unsigned int size = 4;
689
690 clhash->hash = qdisc_class_hash_alloc(size);
691 if (!clhash->hash)
692 return -ENOMEM;
693 clhash->hashsize = size;
694 clhash->hashmask = size - 1;
695 clhash->hashelems = 0;
696 return 0;
697 }
698 EXPORT_SYMBOL(qdisc_class_hash_init);
699
700 void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
701 {
702 kvfree(clhash->hash);
703 }
704 EXPORT_SYMBOL(qdisc_class_hash_destroy);
705
706 void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
707 struct Qdisc_class_common *cl)
708 {
709 unsigned int h;
710
711 INIT_HLIST_NODE(&cl->hnode);
712 h = qdisc_class_hash(cl->classid, clhash->hashmask);
713 hlist_add_head(&cl->hnode, &clhash->hash[h]);
714 clhash->hashelems++;
715 }
716 EXPORT_SYMBOL(qdisc_class_hash_insert);
717
718 void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
719 struct Qdisc_class_common *cl)
720 {
721 hlist_del(&cl->hnode);
722 clhash->hashelems--;
723 }
724 EXPORT_SYMBOL(qdisc_class_hash_remove);
725
726 /* Allocate an unique handle from space managed by kernel
727 * Possible range is [8000-FFFF]:0000 (0x8000 values)
728 */
729 static u32 qdisc_alloc_handle(struct net_device *dev)
730 {
731 int i = 0x8000;
732 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
733
734 do {
735 autohandle += TC_H_MAKE(0x10000U, 0);
736 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
737 autohandle = TC_H_MAKE(0x80000000U, 0);
738 if (!qdisc_lookup(dev, autohandle))
739 return autohandle;
740 cond_resched();
741 } while (--i > 0);
742
743 return 0;
744 }
745
746 void qdisc_tree_reduce_backlog(struct Qdisc *sch, unsigned int n,
747 unsigned int len)
748 {
749 bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED;
750 const struct Qdisc_class_ops *cops;
751 unsigned long cl;
752 u32 parentid;
753 bool notify;
754 int drops;
755
756 if (n == 0 && len == 0)
757 return;
758 drops = max_t(int, n, 0);
759 rcu_read_lock();
760 while ((parentid = sch->parent)) {
761 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
762 break;
763
764 if (sch->flags & TCQ_F_NOPARENT)
765 break;
766 /* Notify parent qdisc only if child qdisc becomes empty.
767 *
768 * If child was empty even before update then backlog
769 * counter is screwed and we skip notification because
770 * parent class is already passive.
771 *
772 * If the original child was offloaded then it is allowed
773 * to be seem as empty, so the parent is notified anyway.
774 */
775 notify = !sch->q.qlen && !WARN_ON_ONCE(!n &&
776 !qdisc_is_offloaded);
777 /* TODO: perform the search on a per txq basis */
778 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
779 if (sch == NULL) {
780 WARN_ON_ONCE(parentid != TC_H_ROOT);
781 break;
782 }
783 cops = sch->ops->cl_ops;
784 if (notify && cops->qlen_notify) {
785 cl = cops->find(sch, parentid);
786 cops->qlen_notify(sch, cl);
787 }
788 sch->q.qlen -= n;
789 sch->qstats.backlog -= len;
790 __qdisc_qstats_drop(sch, drops);
791 }
792 rcu_read_unlock();
793 }
794 EXPORT_SYMBOL(qdisc_tree_reduce_backlog);
795
796 static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
797 u32 portid, u32 seq, u16 flags, int event)
798 {
799 struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
800 struct gnet_stats_queue __percpu *cpu_qstats = NULL;
801 struct tcmsg *tcm;
802 struct nlmsghdr *nlh;
803 unsigned char *b = skb_tail_pointer(skb);
804 struct gnet_dump d;
805 struct qdisc_size_table *stab;
806 u32 block_index;
807 __u32 qlen;
808
809 cond_resched();
810 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
811 if (!nlh)
812 goto out_nlmsg_trim;
813 tcm = nlmsg_data(nlh);
814 tcm->tcm_family = AF_UNSPEC;
815 tcm->tcm__pad1 = 0;
816 tcm->tcm__pad2 = 0;
817 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
818 tcm->tcm_parent = clid;
819 tcm->tcm_handle = q->handle;
820 tcm->tcm_info = refcount_read(&q->refcnt);
821 if (nla_put_string(skb, TCA_KIND, q->ops->id))
822 goto nla_put_failure;
823 if (q->ops->ingress_block_get) {
824 block_index = q->ops->ingress_block_get(q);
825 if (block_index &&
826 nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index))
827 goto nla_put_failure;
828 }
829 if (q->ops->egress_block_get) {
830 block_index = q->ops->egress_block_get(q);
831 if (block_index &&
832 nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index))
833 goto nla_put_failure;
834 }
835 if (q->ops->dump && q->ops->dump(q, skb) < 0)
836 goto nla_put_failure;
837 if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED)))
838 goto nla_put_failure;
839 qlen = qdisc_qlen_sum(q);
840
841 stab = rtnl_dereference(q->stab);
842 if (stab && qdisc_dump_stab(skb, stab) < 0)
843 goto nla_put_failure;
844
845 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
846 NULL, &d, TCA_PAD) < 0)
847 goto nla_put_failure;
848
849 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
850 goto nla_put_failure;
851
852 if (qdisc_is_percpu_stats(q)) {
853 cpu_bstats = q->cpu_bstats;
854 cpu_qstats = q->cpu_qstats;
855 }
856
857 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q),
858 &d, cpu_bstats, &q->bstats) < 0 ||
859 gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
860 gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0)
861 goto nla_put_failure;
862
863 if (gnet_stats_finish_copy(&d) < 0)
864 goto nla_put_failure;
865
866 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
867 return skb->len;
868
869 out_nlmsg_trim:
870 nla_put_failure:
871 nlmsg_trim(skb, b);
872 return -1;
873 }
874
875 static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible)
876 {
877 if (q->flags & TCQ_F_BUILTIN)
878 return true;
879 if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible)
880 return true;
881
882 return false;
883 }
884
885 static int qdisc_notify(struct net *net, struct sk_buff *oskb,
886 struct nlmsghdr *n, u32 clid,
887 struct Qdisc *old, struct Qdisc *new)
888 {
889 struct sk_buff *skb;
890 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
891
892 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
893 if (!skb)
894 return -ENOBUFS;
895
896 if (old && !tc_qdisc_dump_ignore(old, false)) {
897 if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
898 0, RTM_DELQDISC) < 0)
899 goto err_out;
900 }
901 if (new && !tc_qdisc_dump_ignore(new, false)) {
902 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
903 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
904 goto err_out;
905 }
906
907 if (skb->len)
908 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
909 n->nlmsg_flags & NLM_F_ECHO);
910
911 err_out:
912 kfree_skb(skb);
913 return -EINVAL;
914 }
915
916 static void notify_and_destroy(struct net *net, struct sk_buff *skb,
917 struct nlmsghdr *n, u32 clid,
918 struct Qdisc *old, struct Qdisc *new)
919 {
920 if (new || old)
921 qdisc_notify(net, skb, n, clid, old, new);
922
923 if (old)
924 qdisc_destroy(old);
925 }
926
927 /* Graft qdisc "new" to class "classid" of qdisc "parent" or
928 * to device "dev".
929 *
930 * When appropriate send a netlink notification using 'skb'
931 * and "n".
932 *
933 * On success, destroy old qdisc.
934 */
935
936 static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
937 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
938 struct Qdisc *new, struct Qdisc *old,
939 struct netlink_ext_ack *extack)
940 {
941 struct Qdisc *q = old;
942 struct net *net = dev_net(dev);
943 int err = 0;
944
945 if (parent == NULL) {
946 unsigned int i, num_q, ingress;
947
948 ingress = 0;
949 num_q = dev->num_tx_queues;
950 if ((q && q->flags & TCQ_F_INGRESS) ||
951 (new && new->flags & TCQ_F_INGRESS)) {
952 num_q = 1;
953 ingress = 1;
954 if (!dev_ingress_queue(dev)) {
955 NL_SET_ERR_MSG(extack, "Device does not have an ingress queue");
956 return -ENOENT;
957 }
958 }
959
960 if (dev->flags & IFF_UP)
961 dev_deactivate(dev);
962
963 if (new && new->ops->attach)
964 goto skip;
965
966 for (i = 0; i < num_q; i++) {
967 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
968
969 if (!ingress)
970 dev_queue = netdev_get_tx_queue(dev, i);
971
972 old = dev_graft_qdisc(dev_queue, new);
973 if (new && i > 0)
974 qdisc_refcount_inc(new);
975
976 if (!ingress)
977 qdisc_destroy(old);
978 }
979
980 skip:
981 if (!ingress) {
982 notify_and_destroy(net, skb, n, classid,
983 dev->qdisc, new);
984 if (new && !new->ops->attach)
985 qdisc_refcount_inc(new);
986 dev->qdisc = new ? : &noop_qdisc;
987
988 if (new && new->ops->attach)
989 new->ops->attach(new);
990 } else {
991 notify_and_destroy(net, skb, n, classid, old, new);
992 }
993
994 if (dev->flags & IFF_UP)
995 dev_activate(dev);
996 } else {
997 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
998
999 /* Only support running class lockless if parent is lockless */
1000 if (new && (new->flags & TCQ_F_NOLOCK) &&
1001 parent && !(parent->flags & TCQ_F_NOLOCK))
1002 new->flags &= ~TCQ_F_NOLOCK;
1003
1004 err = -EOPNOTSUPP;
1005 if (cops && cops->graft) {
1006 unsigned long cl = cops->find(parent, classid);
1007
1008 if (cl) {
1009 err = cops->graft(parent, cl, new, &old,
1010 extack);
1011 } else {
1012 NL_SET_ERR_MSG(extack, "Specified class not found");
1013 err = -ENOENT;
1014 }
1015 }
1016 if (!err)
1017 notify_and_destroy(net, skb, n, classid, old, new);
1018 }
1019 return err;
1020 }
1021
1022 static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca,
1023 struct netlink_ext_ack *extack)
1024 {
1025 u32 block_index;
1026
1027 if (tca[TCA_INGRESS_BLOCK]) {
1028 block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]);
1029
1030 if (!block_index) {
1031 NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0");
1032 return -EINVAL;
1033 }
1034 if (!sch->ops->ingress_block_set) {
1035 NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported");
1036 return -EOPNOTSUPP;
1037 }
1038 sch->ops->ingress_block_set(sch, block_index);
1039 }
1040 if (tca[TCA_EGRESS_BLOCK]) {
1041 block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]);
1042
1043 if (!block_index) {
1044 NL_SET_ERR_MSG(extack, "Egress block index cannot be 0");
1045 return -EINVAL;
1046 }
1047 if (!sch->ops->egress_block_set) {
1048 NL_SET_ERR_MSG(extack, "Egress block sharing is not supported");
1049 return -EOPNOTSUPP;
1050 }
1051 sch->ops->egress_block_set(sch, block_index);
1052 }
1053 return 0;
1054 }
1055
1056 /* lockdep annotation is needed for ingress; egress gets it only for name */
1057 static struct lock_class_key qdisc_tx_lock;
1058 static struct lock_class_key qdisc_rx_lock;
1059
1060 /*
1061 Allocate and initialize new qdisc.
1062
1063 Parameters are passed via opt.
1064 */
1065
1066 static struct Qdisc *qdisc_create(struct net_device *dev,
1067 struct netdev_queue *dev_queue,
1068 struct Qdisc *p, u32 parent, u32 handle,
1069 struct nlattr **tca, int *errp,
1070 struct netlink_ext_ack *extack)
1071 {
1072 int err;
1073 struct nlattr *kind = tca[TCA_KIND];
1074 struct Qdisc *sch;
1075 struct Qdisc_ops *ops;
1076 struct qdisc_size_table *stab;
1077
1078 ops = qdisc_lookup_ops(kind);
1079 #ifdef CONFIG_MODULES
1080 if (ops == NULL && kind != NULL) {
1081 char name[IFNAMSIZ];
1082 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
1083 /* We dropped the RTNL semaphore in order to
1084 * perform the module load. So, even if we
1085 * succeeded in loading the module we have to
1086 * tell the caller to replay the request. We
1087 * indicate this using -EAGAIN.
1088 * We replay the request because the device may
1089 * go away in the mean time.
1090 */
1091 rtnl_unlock();
1092 request_module("sch_%s", name);
1093 rtnl_lock();
1094 ops = qdisc_lookup_ops(kind);
1095 if (ops != NULL) {
1096 /* We will try again qdisc_lookup_ops,
1097 * so don't keep a reference.
1098 */
1099 module_put(ops->owner);
1100 err = -EAGAIN;
1101 goto err_out;
1102 }
1103 }
1104 }
1105 #endif
1106
1107 err = -ENOENT;
1108 if (!ops) {
1109 NL_SET_ERR_MSG(extack, "Specified qdisc not found");
1110 goto err_out;
1111 }
1112
1113 sch = qdisc_alloc(dev_queue, ops, extack);
1114 if (IS_ERR(sch)) {
1115 err = PTR_ERR(sch);
1116 goto err_out2;
1117 }
1118
1119 sch->parent = parent;
1120
1121 if (handle == TC_H_INGRESS) {
1122 sch->flags |= TCQ_F_INGRESS;
1123 handle = TC_H_MAKE(TC_H_INGRESS, 0);
1124 lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
1125 } else {
1126 if (handle == 0) {
1127 handle = qdisc_alloc_handle(dev);
1128 err = -ENOMEM;
1129 if (handle == 0)
1130 goto err_out3;
1131 }
1132 lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
1133 if (!netif_is_multiqueue(dev))
1134 sch->flags |= TCQ_F_ONETXQUEUE;
1135 }
1136
1137 sch->handle = handle;
1138
1139 /* This exist to keep backward compatible with a userspace
1140 * loophole, what allowed userspace to get IFF_NO_QUEUE
1141 * facility on older kernels by setting tx_queue_len=0 (prior
1142 * to qdisc init), and then forgot to reinit tx_queue_len
1143 * before again attaching a qdisc.
1144 */
1145 if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) {
1146 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
1147 netdev_info(dev, "Caught tx_queue_len zero misconfig\n");
1148 }
1149
1150 err = qdisc_block_indexes_set(sch, tca, extack);
1151 if (err)
1152 goto err_out3;
1153
1154 if (ops->init) {
1155 err = ops->init(sch, tca[TCA_OPTIONS], extack);
1156 if (err != 0)
1157 goto err_out5;
1158 }
1159
1160 if (tca[TCA_STAB]) {
1161 stab = qdisc_get_stab(tca[TCA_STAB], extack);
1162 if (IS_ERR(stab)) {
1163 err = PTR_ERR(stab);
1164 goto err_out4;
1165 }
1166 rcu_assign_pointer(sch->stab, stab);
1167 }
1168 if (tca[TCA_RATE]) {
1169 seqcount_t *running;
1170
1171 err = -EOPNOTSUPP;
1172 if (sch->flags & TCQ_F_MQROOT) {
1173 NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc");
1174 goto err_out4;
1175 }
1176
1177 if (sch->parent != TC_H_ROOT &&
1178 !(sch->flags & TCQ_F_INGRESS) &&
1179 (!p || !(p->flags & TCQ_F_MQROOT)))
1180 running = qdisc_root_sleeping_running(sch);
1181 else
1182 running = &sch->running;
1183
1184 err = gen_new_estimator(&sch->bstats,
1185 sch->cpu_bstats,
1186 &sch->rate_est,
1187 NULL,
1188 running,
1189 tca[TCA_RATE]);
1190 if (err) {
1191 NL_SET_ERR_MSG(extack, "Failed to generate new estimator");
1192 goto err_out4;
1193 }
1194 }
1195
1196 qdisc_hash_add(sch, false);
1197
1198 return sch;
1199
1200 err_out5:
1201 /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */
1202 if (ops->destroy)
1203 ops->destroy(sch);
1204 err_out3:
1205 dev_put(dev);
1206 qdisc_free(sch);
1207 err_out2:
1208 module_put(ops->owner);
1209 err_out:
1210 *errp = err;
1211 return NULL;
1212
1213 err_out4:
1214 /*
1215 * Any broken qdiscs that would require a ops->reset() here?
1216 * The qdisc was never in action so it shouldn't be necessary.
1217 */
1218 qdisc_put_stab(rtnl_dereference(sch->stab));
1219 if (ops->destroy)
1220 ops->destroy(sch);
1221 goto err_out3;
1222 }
1223
1224 static int qdisc_change(struct Qdisc *sch, struct nlattr **tca,
1225 struct netlink_ext_ack *extack)
1226 {
1227 struct qdisc_size_table *ostab, *stab = NULL;
1228 int err = 0;
1229
1230 if (tca[TCA_OPTIONS]) {
1231 if (!sch->ops->change) {
1232 NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc");
1233 return -EINVAL;
1234 }
1235 if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
1236 NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
1237 return -EOPNOTSUPP;
1238 }
1239 err = sch->ops->change(sch, tca[TCA_OPTIONS], extack);
1240 if (err)
1241 return err;
1242 }
1243
1244 if (tca[TCA_STAB]) {
1245 stab = qdisc_get_stab(tca[TCA_STAB], extack);
1246 if (IS_ERR(stab))
1247 return PTR_ERR(stab);
1248 }
1249
1250 ostab = rtnl_dereference(sch->stab);
1251 rcu_assign_pointer(sch->stab, stab);
1252 qdisc_put_stab(ostab);
1253
1254 if (tca[TCA_RATE]) {
1255 /* NB: ignores errors from replace_estimator
1256 because change can't be undone. */
1257 if (sch->flags & TCQ_F_MQROOT)
1258 goto out;
1259 gen_replace_estimator(&sch->bstats,
1260 sch->cpu_bstats,
1261 &sch->rate_est,
1262 NULL,
1263 qdisc_root_sleeping_running(sch),
1264 tca[TCA_RATE]);
1265 }
1266 out:
1267 return 0;
1268 }
1269
1270 struct check_loop_arg {
1271 struct qdisc_walker w;
1272 struct Qdisc *p;
1273 int depth;
1274 };
1275
1276 static int check_loop_fn(struct Qdisc *q, unsigned long cl,
1277 struct qdisc_walker *w);
1278
1279 static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
1280 {
1281 struct check_loop_arg arg;
1282
1283 if (q->ops->cl_ops == NULL)
1284 return 0;
1285
1286 arg.w.stop = arg.w.skip = arg.w.count = 0;
1287 arg.w.fn = check_loop_fn;
1288 arg.depth = depth;
1289 arg.p = p;
1290 q->ops->cl_ops->walk(q, &arg.w);
1291 return arg.w.stop ? -ELOOP : 0;
1292 }
1293
1294 static int
1295 check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
1296 {
1297 struct Qdisc *leaf;
1298 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1299 struct check_loop_arg *arg = (struct check_loop_arg *)w;
1300
1301 leaf = cops->leaf(q, cl);
1302 if (leaf) {
1303 if (leaf == arg->p || arg->depth > 7)
1304 return -ELOOP;
1305 return check_loop(leaf, arg->p, arg->depth + 1);
1306 }
1307 return 0;
1308 }
1309
1310 /*
1311 * Delete/get qdisc.
1312 */
1313
1314 static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
1315 struct netlink_ext_ack *extack)
1316 {
1317 struct net *net = sock_net(skb->sk);
1318 struct tcmsg *tcm = nlmsg_data(n);
1319 struct nlattr *tca[TCA_MAX + 1];
1320 struct net_device *dev;
1321 u32 clid;
1322 struct Qdisc *q = NULL;
1323 struct Qdisc *p = NULL;
1324 int err;
1325
1326 if ((n->nlmsg_type != RTM_GETQDISC) &&
1327 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1328 return -EPERM;
1329
1330 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
1331 if (err < 0)
1332 return err;
1333
1334 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1335 if (!dev)
1336 return -ENODEV;
1337
1338 clid = tcm->tcm_parent;
1339 if (clid) {
1340 if (clid != TC_H_ROOT) {
1341 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
1342 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1343 if (!p) {
1344 NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid");
1345 return -ENOENT;
1346 }
1347 q = qdisc_leaf(p, clid);
1348 } else if (dev_ingress_queue(dev)) {
1349 q = dev_ingress_queue(dev)->qdisc_sleeping;
1350 }
1351 } else {
1352 q = dev->qdisc;
1353 }
1354 if (!q) {
1355 NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device");
1356 return -ENOENT;
1357 }
1358
1359 if (tcm->tcm_handle && q->handle != tcm->tcm_handle) {
1360 NL_SET_ERR_MSG(extack, "Invalid handle");
1361 return -EINVAL;
1362 }
1363 } else {
1364 q = qdisc_lookup(dev, tcm->tcm_handle);
1365 if (!q) {
1366 NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle");
1367 return -ENOENT;
1368 }
1369 }
1370
1371 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1372 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1373 return -EINVAL;
1374 }
1375
1376 if (n->nlmsg_type == RTM_DELQDISC) {
1377 if (!clid) {
1378 NL_SET_ERR_MSG(extack, "Classid cannot be zero");
1379 return -EINVAL;
1380 }
1381 if (q->handle == 0) {
1382 NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero");
1383 return -ENOENT;
1384 }
1385 err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack);
1386 if (err != 0)
1387 return err;
1388 } else {
1389 qdisc_notify(net, skb, n, clid, NULL, q);
1390 }
1391 return 0;
1392 }
1393
1394 /*
1395 * Create/change qdisc.
1396 */
1397
1398 static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
1399 struct netlink_ext_ack *extack)
1400 {
1401 struct net *net = sock_net(skb->sk);
1402 struct tcmsg *tcm;
1403 struct nlattr *tca[TCA_MAX + 1];
1404 struct net_device *dev;
1405 u32 clid;
1406 struct Qdisc *q, *p;
1407 int err;
1408
1409 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1410 return -EPERM;
1411
1412 replay:
1413 /* Reinit, just in case something touches this. */
1414 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
1415 if (err < 0)
1416 return err;
1417
1418 tcm = nlmsg_data(n);
1419 clid = tcm->tcm_parent;
1420 q = p = NULL;
1421
1422 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1423 if (!dev)
1424 return -ENODEV;
1425
1426
1427 if (clid) {
1428 if (clid != TC_H_ROOT) {
1429 if (clid != TC_H_INGRESS) {
1430 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1431 if (!p) {
1432 NL_SET_ERR_MSG(extack, "Failed to find specified qdisc");
1433 return -ENOENT;
1434 }
1435 q = qdisc_leaf(p, clid);
1436 } else if (dev_ingress_queue_create(dev)) {
1437 q = dev_ingress_queue(dev)->qdisc_sleeping;
1438 }
1439 } else {
1440 q = dev->qdisc;
1441 }
1442
1443 /* It may be default qdisc, ignore it */
1444 if (q && q->handle == 0)
1445 q = NULL;
1446
1447 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1448 if (tcm->tcm_handle) {
1449 if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) {
1450 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override");
1451 return -EEXIST;
1452 }
1453 if (TC_H_MIN(tcm->tcm_handle)) {
1454 NL_SET_ERR_MSG(extack, "Invalid minor handle");
1455 return -EINVAL;
1456 }
1457 q = qdisc_lookup(dev, tcm->tcm_handle);
1458 if (!q)
1459 goto create_n_graft;
1460 if (n->nlmsg_flags & NLM_F_EXCL) {
1461 NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override");
1462 return -EEXIST;
1463 }
1464 if (tca[TCA_KIND] &&
1465 nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1466 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1467 return -EINVAL;
1468 }
1469 if (q == p ||
1470 (p && check_loop(q, p, 0))) {
1471 NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected");
1472 return -ELOOP;
1473 }
1474 qdisc_refcount_inc(q);
1475 goto graft;
1476 } else {
1477 if (!q)
1478 goto create_n_graft;
1479
1480 /* This magic test requires explanation.
1481 *
1482 * We know, that some child q is already
1483 * attached to this parent and have choice:
1484 * either to change it or to create/graft new one.
1485 *
1486 * 1. We are allowed to create/graft only
1487 * if CREATE and REPLACE flags are set.
1488 *
1489 * 2. If EXCL is set, requestor wanted to say,
1490 * that qdisc tcm_handle is not expected
1491 * to exist, so that we choose create/graft too.
1492 *
1493 * 3. The last case is when no flags are set.
1494 * Alas, it is sort of hole in API, we
1495 * cannot decide what to do unambiguously.
1496 * For now we select create/graft, if
1497 * user gave KIND, which does not match existing.
1498 */
1499 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1500 (n->nlmsg_flags & NLM_F_REPLACE) &&
1501 ((n->nlmsg_flags & NLM_F_EXCL) ||
1502 (tca[TCA_KIND] &&
1503 nla_strcmp(tca[TCA_KIND], q->ops->id))))
1504 goto create_n_graft;
1505 }
1506 }
1507 } else {
1508 if (!tcm->tcm_handle) {
1509 NL_SET_ERR_MSG(extack, "Handle cannot be zero");
1510 return -EINVAL;
1511 }
1512 q = qdisc_lookup(dev, tcm->tcm_handle);
1513 }
1514
1515 /* Change qdisc parameters */
1516 if (!q) {
1517 NL_SET_ERR_MSG(extack, "Specified qdisc not found");
1518 return -ENOENT;
1519 }
1520 if (n->nlmsg_flags & NLM_F_EXCL) {
1521 NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify");
1522 return -EEXIST;
1523 }
1524 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1525 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1526 return -EINVAL;
1527 }
1528 err = qdisc_change(q, tca, extack);
1529 if (err == 0)
1530 qdisc_notify(net, skb, n, clid, NULL, q);
1531 return err;
1532
1533 create_n_graft:
1534 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1535 NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag");
1536 return -ENOENT;
1537 }
1538 if (clid == TC_H_INGRESS) {
1539 if (dev_ingress_queue(dev)) {
1540 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1541 tcm->tcm_parent, tcm->tcm_parent,
1542 tca, &err, extack);
1543 } else {
1544 NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device");
1545 err = -ENOENT;
1546 }
1547 } else {
1548 struct netdev_queue *dev_queue;
1549
1550 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1551 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1552 else if (p)
1553 dev_queue = p->dev_queue;
1554 else
1555 dev_queue = netdev_get_tx_queue(dev, 0);
1556
1557 q = qdisc_create(dev, dev_queue, p,
1558 tcm->tcm_parent, tcm->tcm_handle,
1559 tca, &err, extack);
1560 }
1561 if (q == NULL) {
1562 if (err == -EAGAIN)
1563 goto replay;
1564 return err;
1565 }
1566
1567 graft:
1568 err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack);
1569 if (err) {
1570 if (q)
1571 qdisc_destroy(q);
1572 return err;
1573 }
1574
1575 return 0;
1576 }
1577
1578 static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1579 struct netlink_callback *cb,
1580 int *q_idx_p, int s_q_idx, bool recur,
1581 bool dump_invisible)
1582 {
1583 int ret = 0, q_idx = *q_idx_p;
1584 struct Qdisc *q;
1585 int b;
1586
1587 if (!root)
1588 return 0;
1589
1590 q = root;
1591 if (q_idx < s_q_idx) {
1592 q_idx++;
1593 } else {
1594 if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1595 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1596 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1597 RTM_NEWQDISC) <= 0)
1598 goto done;
1599 q_idx++;
1600 }
1601
1602 /* If dumping singletons, there is no qdisc_dev(root) and the singleton
1603 * itself has already been dumped.
1604 *
1605 * If we've already dumped the top-level (ingress) qdisc above and the global
1606 * qdisc hashtable, we don't want to hit it again
1607 */
1608 if (!qdisc_dev(root) || !recur)
1609 goto out;
1610
1611 hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
1612 if (q_idx < s_q_idx) {
1613 q_idx++;
1614 continue;
1615 }
1616 if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1617 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1618 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1619 RTM_NEWQDISC) <= 0)
1620 goto done;
1621 q_idx++;
1622 }
1623
1624 out:
1625 *q_idx_p = q_idx;
1626 return ret;
1627 done:
1628 ret = -1;
1629 goto out;
1630 }
1631
1632 static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1633 {
1634 struct net *net = sock_net(skb->sk);
1635 int idx, q_idx;
1636 int s_idx, s_q_idx;
1637 struct net_device *dev;
1638 const struct nlmsghdr *nlh = cb->nlh;
1639 struct nlattr *tca[TCA_MAX + 1];
1640 int err;
1641
1642 s_idx = cb->args[0];
1643 s_q_idx = q_idx = cb->args[1];
1644
1645 idx = 0;
1646 ASSERT_RTNL();
1647
1648 err = nlmsg_parse(nlh, sizeof(struct tcmsg), tca, TCA_MAX, NULL, NULL);
1649 if (err < 0)
1650 return err;
1651
1652 for_each_netdev(net, dev) {
1653 struct netdev_queue *dev_queue;
1654
1655 if (idx < s_idx)
1656 goto cont;
1657 if (idx > s_idx)
1658 s_q_idx = 0;
1659 q_idx = 0;
1660
1661 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx,
1662 true, tca[TCA_DUMP_INVISIBLE]) < 0)
1663 goto done;
1664
1665 dev_queue = dev_ingress_queue(dev);
1666 if (dev_queue &&
1667 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1668 &q_idx, s_q_idx, false,
1669 tca[TCA_DUMP_INVISIBLE]) < 0)
1670 goto done;
1671
1672 cont:
1673 idx++;
1674 }
1675
1676 done:
1677 cb->args[0] = idx;
1678 cb->args[1] = q_idx;
1679
1680 return skb->len;
1681 }
1682
1683
1684
1685 /************************************************
1686 * Traffic classes manipulation. *
1687 ************************************************/
1688
1689 static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1690 unsigned long cl,
1691 u32 portid, u32 seq, u16 flags, int event)
1692 {
1693 struct tcmsg *tcm;
1694 struct nlmsghdr *nlh;
1695 unsigned char *b = skb_tail_pointer(skb);
1696 struct gnet_dump d;
1697 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1698
1699 cond_resched();
1700 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1701 if (!nlh)
1702 goto out_nlmsg_trim;
1703 tcm = nlmsg_data(nlh);
1704 tcm->tcm_family = AF_UNSPEC;
1705 tcm->tcm__pad1 = 0;
1706 tcm->tcm__pad2 = 0;
1707 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1708 tcm->tcm_parent = q->handle;
1709 tcm->tcm_handle = q->handle;
1710 tcm->tcm_info = 0;
1711 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1712 goto nla_put_failure;
1713 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1714 goto nla_put_failure;
1715
1716 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1717 NULL, &d, TCA_PAD) < 0)
1718 goto nla_put_failure;
1719
1720 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1721 goto nla_put_failure;
1722
1723 if (gnet_stats_finish_copy(&d) < 0)
1724 goto nla_put_failure;
1725
1726 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1727 return skb->len;
1728
1729 out_nlmsg_trim:
1730 nla_put_failure:
1731 nlmsg_trim(skb, b);
1732 return -1;
1733 }
1734
1735 static int tclass_notify(struct net *net, struct sk_buff *oskb,
1736 struct nlmsghdr *n, struct Qdisc *q,
1737 unsigned long cl, int event)
1738 {
1739 struct sk_buff *skb;
1740 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1741
1742 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1743 if (!skb)
1744 return -ENOBUFS;
1745
1746 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
1747 kfree_skb(skb);
1748 return -EINVAL;
1749 }
1750
1751 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1752 n->nlmsg_flags & NLM_F_ECHO);
1753 }
1754
1755 static int tclass_del_notify(struct net *net,
1756 const struct Qdisc_class_ops *cops,
1757 struct sk_buff *oskb, struct nlmsghdr *n,
1758 struct Qdisc *q, unsigned long cl)
1759 {
1760 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1761 struct sk_buff *skb;
1762 int err = 0;
1763
1764 if (!cops->delete)
1765 return -EOPNOTSUPP;
1766
1767 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1768 if (!skb)
1769 return -ENOBUFS;
1770
1771 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
1772 RTM_DELTCLASS) < 0) {
1773 kfree_skb(skb);
1774 return -EINVAL;
1775 }
1776
1777 err = cops->delete(q, cl);
1778 if (err) {
1779 kfree_skb(skb);
1780 return err;
1781 }
1782
1783 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1784 n->nlmsg_flags & NLM_F_ECHO);
1785 }
1786
1787 #ifdef CONFIG_NET_CLS
1788
1789 struct tcf_bind_args {
1790 struct tcf_walker w;
1791 u32 classid;
1792 unsigned long cl;
1793 };
1794
1795 static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
1796 {
1797 struct tcf_bind_args *a = (void *)arg;
1798
1799 if (tp->ops->bind_class) {
1800 struct Qdisc *q = tcf_block_q(tp->chain->block);
1801
1802 sch_tree_lock(q);
1803 tp->ops->bind_class(n, a->classid, a->cl);
1804 sch_tree_unlock(q);
1805 }
1806 return 0;
1807 }
1808
1809 static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
1810 unsigned long new_cl)
1811 {
1812 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1813 struct tcf_block *block;
1814 struct tcf_chain *chain;
1815 unsigned long cl;
1816
1817 cl = cops->find(q, portid);
1818 if (!cl)
1819 return;
1820 block = cops->tcf_block(q, cl, NULL);
1821 if (!block)
1822 return;
1823 list_for_each_entry(chain, &block->chain_list, list) {
1824 struct tcf_proto *tp;
1825
1826 for (tp = rtnl_dereference(chain->filter_chain);
1827 tp; tp = rtnl_dereference(tp->next)) {
1828 struct tcf_bind_args arg = {};
1829
1830 arg.w.fn = tcf_node_bind;
1831 arg.classid = clid;
1832 arg.cl = new_cl;
1833 tp->ops->walk(tp, &arg.w);
1834 }
1835 }
1836 }
1837
1838 #else
1839
1840 static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
1841 unsigned long new_cl)
1842 {
1843 }
1844
1845 #endif
1846
1847 static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
1848 struct netlink_ext_ack *extack)
1849 {
1850 struct net *net = sock_net(skb->sk);
1851 struct tcmsg *tcm = nlmsg_data(n);
1852 struct nlattr *tca[TCA_MAX + 1];
1853 struct net_device *dev;
1854 struct Qdisc *q = NULL;
1855 const struct Qdisc_class_ops *cops;
1856 unsigned long cl = 0;
1857 unsigned long new_cl;
1858 u32 portid;
1859 u32 clid;
1860 u32 qid;
1861 int err;
1862
1863 if ((n->nlmsg_type != RTM_GETTCLASS) &&
1864 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1865 return -EPERM;
1866
1867 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
1868 if (err < 0)
1869 return err;
1870
1871 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1872 if (!dev)
1873 return -ENODEV;
1874
1875 /*
1876 parent == TC_H_UNSPEC - unspecified parent.
1877 parent == TC_H_ROOT - class is root, which has no parent.
1878 parent == X:0 - parent is root class.
1879 parent == X:Y - parent is a node in hierarchy.
1880 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1881
1882 handle == 0:0 - generate handle from kernel pool.
1883 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1884 handle == X:Y - clear.
1885 handle == X:0 - root class.
1886 */
1887
1888 /* Step 1. Determine qdisc handle X:0 */
1889
1890 portid = tcm->tcm_parent;
1891 clid = tcm->tcm_handle;
1892 qid = TC_H_MAJ(clid);
1893
1894 if (portid != TC_H_ROOT) {
1895 u32 qid1 = TC_H_MAJ(portid);
1896
1897 if (qid && qid1) {
1898 /* If both majors are known, they must be identical. */
1899 if (qid != qid1)
1900 return -EINVAL;
1901 } else if (qid1) {
1902 qid = qid1;
1903 } else if (qid == 0)
1904 qid = dev->qdisc->handle;
1905
1906 /* Now qid is genuine qdisc handle consistent
1907 * both with parent and child.
1908 *
1909 * TC_H_MAJ(portid) still may be unspecified, complete it now.
1910 */
1911 if (portid)
1912 portid = TC_H_MAKE(qid, portid);
1913 } else {
1914 if (qid == 0)
1915 qid = dev->qdisc->handle;
1916 }
1917
1918 /* OK. Locate qdisc */
1919 q = qdisc_lookup(dev, qid);
1920 if (!q)
1921 return -ENOENT;
1922
1923 /* An check that it supports classes */
1924 cops = q->ops->cl_ops;
1925 if (cops == NULL)
1926 return -EINVAL;
1927
1928 /* Now try to get class */
1929 if (clid == 0) {
1930 if (portid == TC_H_ROOT)
1931 clid = qid;
1932 } else
1933 clid = TC_H_MAKE(qid, clid);
1934
1935 if (clid)
1936 cl = cops->find(q, clid);
1937
1938 if (cl == 0) {
1939 err = -ENOENT;
1940 if (n->nlmsg_type != RTM_NEWTCLASS ||
1941 !(n->nlmsg_flags & NLM_F_CREATE))
1942 goto out;
1943 } else {
1944 switch (n->nlmsg_type) {
1945 case RTM_NEWTCLASS:
1946 err = -EEXIST;
1947 if (n->nlmsg_flags & NLM_F_EXCL)
1948 goto out;
1949 break;
1950 case RTM_DELTCLASS:
1951 err = tclass_del_notify(net, cops, skb, n, q, cl);
1952 /* Unbind the class with flilters with 0 */
1953 tc_bind_tclass(q, portid, clid, 0);
1954 goto out;
1955 case RTM_GETTCLASS:
1956 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
1957 goto out;
1958 default:
1959 err = -EINVAL;
1960 goto out;
1961 }
1962 }
1963
1964 if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
1965 NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes");
1966 return -EOPNOTSUPP;
1967 }
1968
1969 new_cl = cl;
1970 err = -EOPNOTSUPP;
1971 if (cops->change)
1972 err = cops->change(q, clid, portid, tca, &new_cl, extack);
1973 if (err == 0) {
1974 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
1975 /* We just create a new class, need to do reverse binding. */
1976 if (cl != new_cl)
1977 tc_bind_tclass(q, portid, clid, new_cl);
1978 }
1979 out:
1980 return err;
1981 }
1982
1983 struct qdisc_dump_args {
1984 struct qdisc_walker w;
1985 struct sk_buff *skb;
1986 struct netlink_callback *cb;
1987 };
1988
1989 static int qdisc_class_dump(struct Qdisc *q, unsigned long cl,
1990 struct qdisc_walker *arg)
1991 {
1992 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
1993
1994 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
1995 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
1996 RTM_NEWTCLASS);
1997 }
1998
1999 static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
2000 struct tcmsg *tcm, struct netlink_callback *cb,
2001 int *t_p, int s_t)
2002 {
2003 struct qdisc_dump_args arg;
2004
2005 if (tc_qdisc_dump_ignore(q, false) ||
2006 *t_p < s_t || !q->ops->cl_ops ||
2007 (tcm->tcm_parent &&
2008 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
2009 (*t_p)++;
2010 return 0;
2011 }
2012 if (*t_p > s_t)
2013 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
2014 arg.w.fn = qdisc_class_dump;
2015 arg.skb = skb;
2016 arg.cb = cb;
2017 arg.w.stop = 0;
2018 arg.w.skip = cb->args[1];
2019 arg.w.count = 0;
2020 q->ops->cl_ops->walk(q, &arg.w);
2021 cb->args[1] = arg.w.count;
2022 if (arg.w.stop)
2023 return -1;
2024 (*t_p)++;
2025 return 0;
2026 }
2027
2028 static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
2029 struct tcmsg *tcm, struct netlink_callback *cb,
2030 int *t_p, int s_t)
2031 {
2032 struct Qdisc *q;
2033 int b;
2034
2035 if (!root)
2036 return 0;
2037
2038 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
2039 return -1;
2040
2041 if (!qdisc_dev(root))
2042 return 0;
2043
2044 if (tcm->tcm_parent) {
2045 q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent));
2046 if (q && tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
2047 return -1;
2048 return 0;
2049 }
2050 hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
2051 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
2052 return -1;
2053 }
2054
2055 return 0;
2056 }
2057
2058 static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
2059 {
2060 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2061 struct net *net = sock_net(skb->sk);
2062 struct netdev_queue *dev_queue;
2063 struct net_device *dev;
2064 int t, s_t;
2065
2066 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2067 return 0;
2068 dev = dev_get_by_index(net, tcm->tcm_ifindex);
2069 if (!dev)
2070 return 0;
2071
2072 s_t = cb->args[0];
2073 t = 0;
2074
2075 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
2076 goto done;
2077
2078 dev_queue = dev_ingress_queue(dev);
2079 if (dev_queue &&
2080 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
2081 &t, s_t) < 0)
2082 goto done;
2083
2084 done:
2085 cb->args[0] = t;
2086
2087 dev_put(dev);
2088 return skb->len;
2089 }
2090
2091 #ifdef CONFIG_PROC_FS
2092 static int psched_show(struct seq_file *seq, void *v)
2093 {
2094 seq_printf(seq, "%08x %08x %08x %08x\n",
2095 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
2096 1000000,
2097 (u32)NSEC_PER_SEC / hrtimer_resolution);
2098
2099 return 0;
2100 }
2101
2102 static int __net_init psched_net_init(struct net *net)
2103 {
2104 struct proc_dir_entry *e;
2105
2106 e = proc_create_single("psched", 0, net->proc_net, psched_show);
2107 if (e == NULL)
2108 return -ENOMEM;
2109
2110 return 0;
2111 }
2112
2113 static void __net_exit psched_net_exit(struct net *net)
2114 {
2115 remove_proc_entry("psched", net->proc_net);
2116 }
2117 #else
2118 static int __net_init psched_net_init(struct net *net)
2119 {
2120 return 0;
2121 }
2122
2123 static void __net_exit psched_net_exit(struct net *net)
2124 {
2125 }
2126 #endif
2127
2128 static struct pernet_operations psched_net_ops = {
2129 .init = psched_net_init,
2130 .exit = psched_net_exit,
2131 };
2132
2133 static int __init pktsched_init(void)
2134 {
2135 int err;
2136
2137 err = register_pernet_subsys(&psched_net_ops);
2138 if (err) {
2139 pr_err("pktsched_init: "
2140 "cannot initialize per netns operations\n");
2141 return err;
2142 }
2143
2144 register_qdisc(&pfifo_fast_ops);
2145 register_qdisc(&pfifo_qdisc_ops);
2146 register_qdisc(&bfifo_qdisc_ops);
2147 register_qdisc(&pfifo_head_drop_qdisc_ops);
2148 register_qdisc(&mq_qdisc_ops);
2149 register_qdisc(&noqueue_qdisc_ops);
2150
2151 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0);
2152 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0);
2153 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc,
2154 0);
2155 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0);
2156 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0);
2157 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass,
2158 0);
2159
2160 return 0;
2161 }
2162
2163 subsys_initcall(pktsched_init);
Linux with added FPC-III support