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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/sch_api.c Packet scheduler API.
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 *
7 * Fixes:
8 *
9 * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired.
10 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
11 * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support
12 */
13
14#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/kernel.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19#include <linux/skbuff.h>
20#include <linux/init.h>
21#include <linux/proc_fs.h>
22#include <linux/seq_file.h>
23#include <linux/kmod.h>
24#include <linux/list.h>
25#include <linux/hrtimer.h>
26#include <linux/slab.h>
27#include <linux/hashtable.h>
28
29#include <net/net_namespace.h>
30#include <net/sock.h>
31#include <net/netlink.h>
32#include <net/pkt_sched.h>
33#include <net/pkt_cls.h>
34
35/*
36
37 Short review.
38 -------------
39
40 This file consists of two interrelated parts:
41
42 1. queueing disciplines manager frontend.
43 2. traffic classes manager frontend.
44
45 Generally, queueing discipline ("qdisc") is a black box,
46 which is able to enqueue packets and to dequeue them (when
47 device is ready to send something) in order and at times
48 determined by algorithm hidden in it.
49
50 qdisc's are divided to two categories:
51 - "queues", which have no internal structure visible from outside.
52 - "schedulers", which split all the packets to "traffic classes",
53 using "packet classifiers" (look at cls_api.c)
54
55 In turn, classes may have child qdiscs (as rule, queues)
56 attached to them etc. etc. etc.
57
58 The goal of the routines in this file is to translate
59 information supplied by user in the form of handles
60 to more intelligible for kernel form, to make some sanity
61 checks and part of work, which is common to all qdiscs
62 and to provide rtnetlink notifications.
63
64 All real intelligent work is done inside qdisc modules.
65
66
67
68 Every discipline has two major routines: enqueue and dequeue.
69
70 ---dequeue
71
72 dequeue usually returns a skb to send. It is allowed to return NULL,
73 but it does not mean that queue is empty, it just means that
74 discipline does not want to send anything this time.
75 Queue is really empty if q->q.qlen == 0.
76 For complicated disciplines with multiple queues q->q is not
77 real packet queue, but however q->q.qlen must be valid.
78
79 ---enqueue
80
81 enqueue returns 0, if packet was enqueued successfully.
82 If packet (this one or another one) was dropped, it returns
83 not zero error code.
84 NET_XMIT_DROP - this packet dropped
85 Expected action: do not backoff, but wait until queue will clear.
86 NET_XMIT_CN - probably this packet enqueued, but another one dropped.
87 Expected action: backoff or ignore
88
89 Auxiliary routines:
90
91 ---peek
92
93 like dequeue but without removing a packet from the queue
94
95 ---reset
96
97 returns qdisc to initial state: purge all buffers, clear all
98 timers, counters (except for statistics) etc.
99
100 ---init
101
102 initializes newly created qdisc.
103
104 ---destroy
105
106 destroys resources allocated by init and during lifetime of qdisc.
107
108 ---change
109
110 changes qdisc parameters.
111 */
112
113/* Protects list of registered TC modules. It is pure SMP lock. */
114static DEFINE_RWLOCK(qdisc_mod_lock);
115
116
117/************************************************
118 * Queueing disciplines manipulation. *
119 ************************************************/
120
121
122/* The list of all installed queueing disciplines. */
123
124static struct Qdisc_ops *qdisc_base;
125
126/* Register/unregister queueing discipline */
127
128int register_qdisc(struct Qdisc_ops *qops)
129{
130 struct Qdisc_ops *q, **qp;
131 int rc = -EEXIST;
132
133 write_lock(&qdisc_mod_lock);
134 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
135 if (!strcmp(qops->id, q->id))
136 goto out;
137
138 if (qops->enqueue == NULL)
139 qops->enqueue = noop_qdisc_ops.enqueue;
140 if (qops->peek == NULL) {
141 if (qops->dequeue == NULL)
142 qops->peek = noop_qdisc_ops.peek;
143 else
144 goto out_einval;
145 }
146 if (qops->dequeue == NULL)
147 qops->dequeue = noop_qdisc_ops.dequeue;
148
149 if (qops->cl_ops) {
150 const struct Qdisc_class_ops *cops = qops->cl_ops;
151
152 if (!(cops->find && cops->walk && cops->leaf))
153 goto out_einval;
154
155 if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf))
156 goto out_einval;
157 }
158
159 qops->next = NULL;
160 *qp = qops;
161 rc = 0;
162out:
163 write_unlock(&qdisc_mod_lock);
164 return rc;
165
166out_einval:
167 rc = -EINVAL;
168 goto out;
169}
170EXPORT_SYMBOL(register_qdisc);
171
172int unregister_qdisc(struct Qdisc_ops *qops)
173{
174 struct Qdisc_ops *q, **qp;
175 int err = -ENOENT;
176
177 write_lock(&qdisc_mod_lock);
178 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
179 if (q == qops)
180 break;
181 if (q) {
182 *qp = q->next;
183 q->next = NULL;
184 err = 0;
185 }
186 write_unlock(&qdisc_mod_lock);
187 return err;
188}
189EXPORT_SYMBOL(unregister_qdisc);
190
191/* Get default qdisc if not otherwise specified */
192void qdisc_get_default(char *name, size_t len)
193{
194 read_lock(&qdisc_mod_lock);
195 strlcpy(name, default_qdisc_ops->id, len);
196 read_unlock(&qdisc_mod_lock);
197}
198
199static struct Qdisc_ops *qdisc_lookup_default(const char *name)
200{
201 struct Qdisc_ops *q = NULL;
202
203 for (q = qdisc_base; q; q = q->next) {
204 if (!strcmp(name, q->id)) {
205 if (!try_module_get(q->owner))
206 q = NULL;
207 break;
208 }
209 }
210
211 return q;
212}
213
214/* Set new default qdisc to use */
215int qdisc_set_default(const char *name)
216{
217 const struct Qdisc_ops *ops;
218
219 if (!capable(CAP_NET_ADMIN))
220 return -EPERM;
221
222 write_lock(&qdisc_mod_lock);
223 ops = qdisc_lookup_default(name);
224 if (!ops) {
225 /* Not found, drop lock and try to load module */
226 write_unlock(&qdisc_mod_lock);
227 request_module("sch_%s", name);
228 write_lock(&qdisc_mod_lock);
229
230 ops = qdisc_lookup_default(name);
231 }
232
233 if (ops) {
234 /* Set new default */
235 module_put(default_qdisc_ops->owner);
236 default_qdisc_ops = ops;
237 }
238 write_unlock(&qdisc_mod_lock);
239
240 return ops ? 0 : -ENOENT;
241}
242
243#ifdef CONFIG_NET_SCH_DEFAULT
244/* Set default value from kernel config */
245static int __init sch_default_qdisc(void)
246{
247 return qdisc_set_default(CONFIG_DEFAULT_NET_SCH);
248}
249late_initcall(sch_default_qdisc);
250#endif
251
252/* We know handle. Find qdisc among all qdisc's attached to device
253 * (root qdisc, all its children, children of children etc.)
254 * Note: caller either uses rtnl or rcu_read_lock()
255 */
256
257static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
258{
259 struct Qdisc *q;
260
261 if (!qdisc_dev(root))
262 return (root->handle == handle ? root : NULL);
263
264 if (!(root->flags & TCQ_F_BUILTIN) &&
265 root->handle == handle)
266 return root;
267
268 hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) {
269 if (q->handle == handle)
270 return q;
271 }
272 return NULL;
273}
274
275void qdisc_hash_add(struct Qdisc *q, bool invisible)
276{
277 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
278 ASSERT_RTNL();
279 hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle);
280 if (invisible)
281 q->flags |= TCQ_F_INVISIBLE;
282 }
283}
284EXPORT_SYMBOL(qdisc_hash_add);
285
286void qdisc_hash_del(struct Qdisc *q)
287{
288 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
289 ASSERT_RTNL();
290 hash_del_rcu(&q->hash);
291 }
292}
293EXPORT_SYMBOL(qdisc_hash_del);
294
295struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
296{
297 struct Qdisc *q;
298
299 if (!handle)
300 return NULL;
301 q = qdisc_match_from_root(dev->qdisc, handle);
302 if (q)
303 goto out;
304
305 if (dev_ingress_queue(dev))
306 q = qdisc_match_from_root(
307 dev_ingress_queue(dev)->qdisc_sleeping,
308 handle);
309out:
310 return q;
311}
312
313struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle)
314{
315 struct netdev_queue *nq;
316 struct Qdisc *q;
317
318 if (!handle)
319 return NULL;
320 q = qdisc_match_from_root(dev->qdisc, handle);
321 if (q)
322 goto out;
323
324 nq = dev_ingress_queue_rcu(dev);
325 if (nq)
326 q = qdisc_match_from_root(nq->qdisc_sleeping, handle);
327out:
328 return q;
329}
330
331static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
332{
333 unsigned long cl;
334 const struct Qdisc_class_ops *cops = p->ops->cl_ops;
335
336 if (cops == NULL)
337 return NULL;
338 cl = cops->find(p, classid);
339
340 if (cl == 0)
341 return NULL;
342 return cops->leaf(p, cl);
343}
344
345/* Find queueing discipline by name */
346
347static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
348{
349 struct Qdisc_ops *q = NULL;
350
351 if (kind) {
352 read_lock(&qdisc_mod_lock);
353 for (q = qdisc_base; q; q = q->next) {
354 if (nla_strcmp(kind, q->id) == 0) {
355 if (!try_module_get(q->owner))
356 q = NULL;
357 break;
358 }
359 }
360 read_unlock(&qdisc_mod_lock);
361 }
362 return q;
363}
364
365/* The linklayer setting were not transferred from iproute2, in older
366 * versions, and the rate tables lookup systems have been dropped in
367 * the kernel. To keep backward compatible with older iproute2 tc
368 * utils, we detect the linklayer setting by detecting if the rate
369 * table were modified.
370 *
371 * For linklayer ATM table entries, the rate table will be aligned to
372 * 48 bytes, thus some table entries will contain the same value. The
373 * mpu (min packet unit) is also encoded into the old rate table, thus
374 * starting from the mpu, we find low and high table entries for
375 * mapping this cell. If these entries contain the same value, when
376 * the rate tables have been modified for linklayer ATM.
377 *
378 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
379 * and then roundup to the next cell, calc the table entry one below,
380 * and compare.
381 */
382static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
383{
384 int low = roundup(r->mpu, 48);
385 int high = roundup(low+1, 48);
386 int cell_low = low >> r->cell_log;
387 int cell_high = (high >> r->cell_log) - 1;
388
389 /* rtab is too inaccurate at rates > 100Mbit/s */
390 if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
391 pr_debug("TC linklayer: Giving up ATM detection\n");
392 return TC_LINKLAYER_ETHERNET;
393 }
394
395 if ((cell_high > cell_low) && (cell_high < 256)
396 && (rtab[cell_low] == rtab[cell_high])) {
397 pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
398 cell_low, cell_high, rtab[cell_high]);
399 return TC_LINKLAYER_ATM;
400 }
401 return TC_LINKLAYER_ETHERNET;
402}
403
404static struct qdisc_rate_table *qdisc_rtab_list;
405
406struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
407 struct nlattr *tab,
408 struct netlink_ext_ack *extack)
409{
410 struct qdisc_rate_table *rtab;
411
412 if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
413 nla_len(tab) != TC_RTAB_SIZE) {
414 NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching");
415 return NULL;
416 }
417
418 for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
419 if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) &&
420 !memcmp(&rtab->data, nla_data(tab), 1024)) {
421 rtab->refcnt++;
422 return rtab;
423 }
424 }
425
426 rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
427 if (rtab) {
428 rtab->rate = *r;
429 rtab->refcnt = 1;
430 memcpy(rtab->data, nla_data(tab), 1024);
431 if (r->linklayer == TC_LINKLAYER_UNAWARE)
432 r->linklayer = __detect_linklayer(r, rtab->data);
433 rtab->next = qdisc_rtab_list;
434 qdisc_rtab_list = rtab;
435 } else {
436 NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table");
437 }
438 return rtab;
439}
440EXPORT_SYMBOL(qdisc_get_rtab);
441
442void qdisc_put_rtab(struct qdisc_rate_table *tab)
443{
444 struct qdisc_rate_table *rtab, **rtabp;
445
446 if (!tab || --tab->refcnt)
447 return;
448
449 for (rtabp = &qdisc_rtab_list;
450 (rtab = *rtabp) != NULL;
451 rtabp = &rtab->next) {
452 if (rtab == tab) {
453 *rtabp = rtab->next;
454 kfree(rtab);
455 return;
456 }
457 }
458}
459EXPORT_SYMBOL(qdisc_put_rtab);
460
461static LIST_HEAD(qdisc_stab_list);
462
463static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
464 [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
465 [TCA_STAB_DATA] = { .type = NLA_BINARY },
466};
467
468static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt,
469 struct netlink_ext_ack *extack)
470{
471 struct nlattr *tb[TCA_STAB_MAX + 1];
472 struct qdisc_size_table *stab;
473 struct tc_sizespec *s;
474 unsigned int tsize = 0;
475 u16 *tab = NULL;
476 int err;
477
478 err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy,
479 extack);
480 if (err < 0)
481 return ERR_PTR(err);
482 if (!tb[TCA_STAB_BASE]) {
483 NL_SET_ERR_MSG(extack, "Size table base attribute is missing");
484 return ERR_PTR(-EINVAL);
485 }
486
487 s = nla_data(tb[TCA_STAB_BASE]);
488
489 if (s->tsize > 0) {
490 if (!tb[TCA_STAB_DATA]) {
491 NL_SET_ERR_MSG(extack, "Size table data attribute is missing");
492 return ERR_PTR(-EINVAL);
493 }
494 tab = nla_data(tb[TCA_STAB_DATA]);
495 tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
496 }
497
498 if (tsize != s->tsize || (!tab && tsize > 0)) {
499 NL_SET_ERR_MSG(extack, "Invalid size of size table");
500 return ERR_PTR(-EINVAL);
501 }
502
503 list_for_each_entry(stab, &qdisc_stab_list, list) {
504 if (memcmp(&stab->szopts, s, sizeof(*s)))
505 continue;
506 if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
507 continue;
508 stab->refcnt++;
509 return stab;
510 }
511
512 stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
513 if (!stab)
514 return ERR_PTR(-ENOMEM);
515
516 stab->refcnt = 1;
517 stab->szopts = *s;
518 if (tsize > 0)
519 memcpy(stab->data, tab, tsize * sizeof(u16));
520
521 list_add_tail(&stab->list, &qdisc_stab_list);
522
523 return stab;
524}
525
526void qdisc_put_stab(struct qdisc_size_table *tab)
527{
528 if (!tab)
529 return;
530
531 if (--tab->refcnt == 0) {
532 list_del(&tab->list);
533 kfree_rcu(tab, rcu);
534 }
535}
536EXPORT_SYMBOL(qdisc_put_stab);
537
538static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
539{
540 struct nlattr *nest;
541
542 nest = nla_nest_start_noflag(skb, TCA_STAB);
543 if (nest == NULL)
544 goto nla_put_failure;
545 if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
546 goto nla_put_failure;
547 nla_nest_end(skb, nest);
548
549 return skb->len;
550
551nla_put_failure:
552 return -1;
553}
554
555void __qdisc_calculate_pkt_len(struct sk_buff *skb,
556 const struct qdisc_size_table *stab)
557{
558 int pkt_len, slot;
559
560 pkt_len = skb->len + stab->szopts.overhead;
561 if (unlikely(!stab->szopts.tsize))
562 goto out;
563
564 slot = pkt_len + stab->szopts.cell_align;
565 if (unlikely(slot < 0))
566 slot = 0;
567
568 slot >>= stab->szopts.cell_log;
569 if (likely(slot < stab->szopts.tsize))
570 pkt_len = stab->data[slot];
571 else
572 pkt_len = stab->data[stab->szopts.tsize - 1] *
573 (slot / stab->szopts.tsize) +
574 stab->data[slot % stab->szopts.tsize];
575
576 pkt_len <<= stab->szopts.size_log;
577out:
578 if (unlikely(pkt_len < 1))
579 pkt_len = 1;
580 qdisc_skb_cb(skb)->pkt_len = pkt_len;
581}
582EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
583
584void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc)
585{
586 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
587 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
588 txt, qdisc->ops->id, qdisc->handle >> 16);
589 qdisc->flags |= TCQ_F_WARN_NONWC;
590 }
591}
592EXPORT_SYMBOL(qdisc_warn_nonwc);
593
594static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
595{
596 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
597 timer);
598
599 rcu_read_lock();
600 __netif_schedule(qdisc_root(wd->qdisc));
601 rcu_read_unlock();
602
603 return HRTIMER_NORESTART;
604}
605
606void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
607 clockid_t clockid)
608{
609 hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED);
610 wd->timer.function = qdisc_watchdog;
611 wd->qdisc = qdisc;
612}
613EXPORT_SYMBOL(qdisc_watchdog_init_clockid);
614
615void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
616{
617 qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC);
618}
619EXPORT_SYMBOL(qdisc_watchdog_init);
620
621void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
622{
623 if (test_bit(__QDISC_STATE_DEACTIVATED,
624 &qdisc_root_sleeping(wd->qdisc)->state))
625 return;
626
627 if (wd->last_expires == expires)
628 return;
629
630 wd->last_expires = expires;
631 hrtimer_start(&wd->timer,
632 ns_to_ktime(expires),
633 HRTIMER_MODE_ABS_PINNED);
634}
635EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);
636
637void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
638{
639 hrtimer_cancel(&wd->timer);
640}
641EXPORT_SYMBOL(qdisc_watchdog_cancel);
642
643static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
644{
645 struct hlist_head *h;
646 unsigned int i;
647
648 h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL);
649
650 if (h != NULL) {
651 for (i = 0; i < n; i++)
652 INIT_HLIST_HEAD(&h[i]);
653 }
654 return h;
655}
656
657void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
658{
659 struct Qdisc_class_common *cl;
660 struct hlist_node *next;
661 struct hlist_head *nhash, *ohash;
662 unsigned int nsize, nmask, osize;
663 unsigned int i, h;
664
665 /* Rehash when load factor exceeds 0.75 */
666 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
667 return;
668 nsize = clhash->hashsize * 2;
669 nmask = nsize - 1;
670 nhash = qdisc_class_hash_alloc(nsize);
671 if (nhash == NULL)
672 return;
673
674 ohash = clhash->hash;
675 osize = clhash->hashsize;
676
677 sch_tree_lock(sch);
678 for (i = 0; i < osize; i++) {
679 hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
680 h = qdisc_class_hash(cl->classid, nmask);
681 hlist_add_head(&cl->hnode, &nhash[h]);
682 }
683 }
684 clhash->hash = nhash;
685 clhash->hashsize = nsize;
686 clhash->hashmask = nmask;
687 sch_tree_unlock(sch);
688
689 kvfree(ohash);
690}
691EXPORT_SYMBOL(qdisc_class_hash_grow);
692
693int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
694{
695 unsigned int size = 4;
696
697 clhash->hash = qdisc_class_hash_alloc(size);
698 if (!clhash->hash)
699 return -ENOMEM;
700 clhash->hashsize = size;
701 clhash->hashmask = size - 1;
702 clhash->hashelems = 0;
703 return 0;
704}
705EXPORT_SYMBOL(qdisc_class_hash_init);
706
707void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
708{
709 kvfree(clhash->hash);
710}
711EXPORT_SYMBOL(qdisc_class_hash_destroy);
712
713void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
714 struct Qdisc_class_common *cl)
715{
716 unsigned int h;
717
718 INIT_HLIST_NODE(&cl->hnode);
719 h = qdisc_class_hash(cl->classid, clhash->hashmask);
720 hlist_add_head(&cl->hnode, &clhash->hash[h]);
721 clhash->hashelems++;
722}
723EXPORT_SYMBOL(qdisc_class_hash_insert);
724
725void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
726 struct Qdisc_class_common *cl)
727{
728 hlist_del(&cl->hnode);
729 clhash->hashelems--;
730}
731EXPORT_SYMBOL(qdisc_class_hash_remove);
732
733/* Allocate an unique handle from space managed by kernel
734 * Possible range is [8000-FFFF]:0000 (0x8000 values)
735 */
736static u32 qdisc_alloc_handle(struct net_device *dev)
737{
738 int i = 0x8000;
739 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
740
741 do {
742 autohandle += TC_H_MAKE(0x10000U, 0);
743 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
744 autohandle = TC_H_MAKE(0x80000000U, 0);
745 if (!qdisc_lookup(dev, autohandle))
746 return autohandle;
747 cond_resched();
748 } while (--i > 0);
749
750 return 0;
751}
752
753void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len)
754{
755 bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED;
756 const struct Qdisc_class_ops *cops;
757 unsigned long cl;
758 u32 parentid;
759 bool notify;
760 int drops;
761
762 if (n == 0 && len == 0)
763 return;
764 drops = max_t(int, n, 0);
765 rcu_read_lock();
766 while ((parentid = sch->parent)) {
767 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
768 break;
769
770 if (sch->flags & TCQ_F_NOPARENT)
771 break;
772 /* Notify parent qdisc only if child qdisc becomes empty.
773 *
774 * If child was empty even before update then backlog
775 * counter is screwed and we skip notification because
776 * parent class is already passive.
777 *
778 * If the original child was offloaded then it is allowed
779 * to be seem as empty, so the parent is notified anyway.
780 */
781 notify = !sch->q.qlen && !WARN_ON_ONCE(!n &&
782 !qdisc_is_offloaded);
783 /* TODO: perform the search on a per txq basis */
784 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
785 if (sch == NULL) {
786 WARN_ON_ONCE(parentid != TC_H_ROOT);
787 break;
788 }
789 cops = sch->ops->cl_ops;
790 if (notify && cops->qlen_notify) {
791 cl = cops->find(sch, parentid);
792 cops->qlen_notify(sch, cl);
793 }
794 sch->q.qlen -= n;
795 sch->qstats.backlog -= len;
796 __qdisc_qstats_drop(sch, drops);
797 }
798 rcu_read_unlock();
799}
800EXPORT_SYMBOL(qdisc_tree_reduce_backlog);
801
802int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type,
803 void *type_data)
804{
805 struct net_device *dev = qdisc_dev(sch);
806 int err;
807
808 sch->flags &= ~TCQ_F_OFFLOADED;
809 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
810 return 0;
811
812 err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
813 if (err == -EOPNOTSUPP)
814 return 0;
815
816 if (!err)
817 sch->flags |= TCQ_F_OFFLOADED;
818
819 return err;
820}
821EXPORT_SYMBOL(qdisc_offload_dump_helper);
822
823void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
824 struct Qdisc *new, struct Qdisc *old,
825 enum tc_setup_type type, void *type_data,
826 struct netlink_ext_ack *extack)
827{
828 bool any_qdisc_is_offloaded;
829 int err;
830
831 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
832 return;
833
834 err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
835
836 /* Don't report error if the graft is part of destroy operation. */
837 if (!err || !new || new == &noop_qdisc)
838 return;
839
840 /* Don't report error if the parent, the old child and the new
841 * one are not offloaded.
842 */
843 any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED;
844 any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED;
845 any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED;
846
847 if (any_qdisc_is_offloaded)
848 NL_SET_ERR_MSG(extack, "Offloading graft operation failed.");
849}
850EXPORT_SYMBOL(qdisc_offload_graft_helper);
851
852static void qdisc_offload_graft_root(struct net_device *dev,
853 struct Qdisc *new, struct Qdisc *old,
854 struct netlink_ext_ack *extack)
855{
856 struct tc_root_qopt_offload graft_offload = {
857 .command = TC_ROOT_GRAFT,
858 .handle = new ? new->handle : 0,
859 .ingress = (new && new->flags & TCQ_F_INGRESS) ||
860 (old && old->flags & TCQ_F_INGRESS),
861 };
862
863 qdisc_offload_graft_helper(dev, NULL, new, old,
864 TC_SETUP_ROOT_QDISC, &graft_offload, extack);
865}
866
867static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
868 u32 portid, u32 seq, u16 flags, int event)
869{
870 struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
871 struct gnet_stats_queue __percpu *cpu_qstats = NULL;
872 struct tcmsg *tcm;
873 struct nlmsghdr *nlh;
874 unsigned char *b = skb_tail_pointer(skb);
875 struct gnet_dump d;
876 struct qdisc_size_table *stab;
877 u32 block_index;
878 __u32 qlen;
879
880 cond_resched();
881 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
882 if (!nlh)
883 goto out_nlmsg_trim;
884 tcm = nlmsg_data(nlh);
885 tcm->tcm_family = AF_UNSPEC;
886 tcm->tcm__pad1 = 0;
887 tcm->tcm__pad2 = 0;
888 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
889 tcm->tcm_parent = clid;
890 tcm->tcm_handle = q->handle;
891 tcm->tcm_info = refcount_read(&q->refcnt);
892 if (nla_put_string(skb, TCA_KIND, q->ops->id))
893 goto nla_put_failure;
894 if (q->ops->ingress_block_get) {
895 block_index = q->ops->ingress_block_get(q);
896 if (block_index &&
897 nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index))
898 goto nla_put_failure;
899 }
900 if (q->ops->egress_block_get) {
901 block_index = q->ops->egress_block_get(q);
902 if (block_index &&
903 nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index))
904 goto nla_put_failure;
905 }
906 if (q->ops->dump && q->ops->dump(q, skb) < 0)
907 goto nla_put_failure;
908 if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED)))
909 goto nla_put_failure;
910 qlen = qdisc_qlen_sum(q);
911
912 stab = rtnl_dereference(q->stab);
913 if (stab && qdisc_dump_stab(skb, stab) < 0)
914 goto nla_put_failure;
915
916 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
917 NULL, &d, TCA_PAD) < 0)
918 goto nla_put_failure;
919
920 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
921 goto nla_put_failure;
922
923 if (qdisc_is_percpu_stats(q)) {
924 cpu_bstats = q->cpu_bstats;
925 cpu_qstats = q->cpu_qstats;
926 }
927
928 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q),
929 &d, cpu_bstats, &q->bstats) < 0 ||
930 gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
931 gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0)
932 goto nla_put_failure;
933
934 if (gnet_stats_finish_copy(&d) < 0)
935 goto nla_put_failure;
936
937 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
938 return skb->len;
939
940out_nlmsg_trim:
941nla_put_failure:
942 nlmsg_trim(skb, b);
943 return -1;
944}
945
946static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible)
947{
948 if (q->flags & TCQ_F_BUILTIN)
949 return true;
950 if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible)
951 return true;
952
953 return false;
954}
955
956static int qdisc_notify(struct net *net, struct sk_buff *oskb,
957 struct nlmsghdr *n, u32 clid,
958 struct Qdisc *old, struct Qdisc *new)
959{
960 struct sk_buff *skb;
961 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
962
963 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
964 if (!skb)
965 return -ENOBUFS;
966
967 if (old && !tc_qdisc_dump_ignore(old, false)) {
968 if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
969 0, RTM_DELQDISC) < 0)
970 goto err_out;
971 }
972 if (new && !tc_qdisc_dump_ignore(new, false)) {
973 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
974 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
975 goto err_out;
976 }
977
978 if (skb->len)
979 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
980 n->nlmsg_flags & NLM_F_ECHO);
981
982err_out:
983 kfree_skb(skb);
984 return -EINVAL;
985}
986
987static void notify_and_destroy(struct net *net, struct sk_buff *skb,
988 struct nlmsghdr *n, u32 clid,
989 struct Qdisc *old, struct Qdisc *new)
990{
991 if (new || old)
992 qdisc_notify(net, skb, n, clid, old, new);
993
994 if (old)
995 qdisc_put(old);
996}
997
998static void qdisc_clear_nolock(struct Qdisc *sch)
999{
1000 sch->flags &= ~TCQ_F_NOLOCK;
1001 if (!(sch->flags & TCQ_F_CPUSTATS))
1002 return;
1003
1004 free_percpu(sch->cpu_bstats);
1005 free_percpu(sch->cpu_qstats);
1006 sch->cpu_bstats = NULL;
1007 sch->cpu_qstats = NULL;
1008 sch->flags &= ~TCQ_F_CPUSTATS;
1009}
1010
1011/* Graft qdisc "new" to class "classid" of qdisc "parent" or
1012 * to device "dev".
1013 *
1014 * When appropriate send a netlink notification using 'skb'
1015 * and "n".
1016 *
1017 * On success, destroy old qdisc.
1018 */
1019
1020static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
1021 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
1022 struct Qdisc *new, struct Qdisc *old,
1023 struct netlink_ext_ack *extack)
1024{
1025 struct Qdisc *q = old;
1026 struct net *net = dev_net(dev);
1027
1028 if (parent == NULL) {
1029 unsigned int i, num_q, ingress;
1030
1031 ingress = 0;
1032 num_q = dev->num_tx_queues;
1033 if ((q && q->flags & TCQ_F_INGRESS) ||
1034 (new && new->flags & TCQ_F_INGRESS)) {
1035 num_q = 1;
1036 ingress = 1;
1037 if (!dev_ingress_queue(dev)) {
1038 NL_SET_ERR_MSG(extack, "Device does not have an ingress queue");
1039 return -ENOENT;
1040 }
1041 }
1042
1043 if (dev->flags & IFF_UP)
1044 dev_deactivate(dev);
1045
1046 qdisc_offload_graft_root(dev, new, old, extack);
1047
1048 if (new && new->ops->attach)
1049 goto skip;
1050
1051 for (i = 0; i < num_q; i++) {
1052 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
1053
1054 if (!ingress)
1055 dev_queue = netdev_get_tx_queue(dev, i);
1056
1057 old = dev_graft_qdisc(dev_queue, new);
1058 if (new && i > 0)
1059 qdisc_refcount_inc(new);
1060
1061 if (!ingress)
1062 qdisc_put(old);
1063 }
1064
1065skip:
1066 if (!ingress) {
1067 notify_and_destroy(net, skb, n, classid,
1068 dev->qdisc, new);
1069 if (new && !new->ops->attach)
1070 qdisc_refcount_inc(new);
1071 dev->qdisc = new ? : &noop_qdisc;
1072
1073 if (new && new->ops->attach)
1074 new->ops->attach(new);
1075 } else {
1076 notify_and_destroy(net, skb, n, classid, old, new);
1077 }
1078
1079 if (dev->flags & IFF_UP)
1080 dev_activate(dev);
1081 } else {
1082 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
1083 unsigned long cl;
1084 int err;
1085
1086 /* Only support running class lockless if parent is lockless */
1087 if (new && (new->flags & TCQ_F_NOLOCK) &&
1088 parent && !(parent->flags & TCQ_F_NOLOCK))
1089 qdisc_clear_nolock(new);
1090
1091 if (!cops || !cops->graft)
1092 return -EOPNOTSUPP;
1093
1094 cl = cops->find(parent, classid);
1095 if (!cl) {
1096 NL_SET_ERR_MSG(extack, "Specified class not found");
1097 return -ENOENT;
1098 }
1099
1100 err = cops->graft(parent, cl, new, &old, extack);
1101 if (err)
1102 return err;
1103 notify_and_destroy(net, skb, n, classid, old, new);
1104 }
1105 return 0;
1106}
1107
1108static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca,
1109 struct netlink_ext_ack *extack)
1110{
1111 u32 block_index;
1112
1113 if (tca[TCA_INGRESS_BLOCK]) {
1114 block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]);
1115
1116 if (!block_index) {
1117 NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0");
1118 return -EINVAL;
1119 }
1120 if (!sch->ops->ingress_block_set) {
1121 NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported");
1122 return -EOPNOTSUPP;
1123 }
1124 sch->ops->ingress_block_set(sch, block_index);
1125 }
1126 if (tca[TCA_EGRESS_BLOCK]) {
1127 block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]);
1128
1129 if (!block_index) {
1130 NL_SET_ERR_MSG(extack, "Egress block index cannot be 0");
1131 return -EINVAL;
1132 }
1133 if (!sch->ops->egress_block_set) {
1134 NL_SET_ERR_MSG(extack, "Egress block sharing is not supported");
1135 return -EOPNOTSUPP;
1136 }
1137 sch->ops->egress_block_set(sch, block_index);
1138 }
1139 return 0;
1140}
1141
1142/*
1143 Allocate and initialize new qdisc.
1144
1145 Parameters are passed via opt.
1146 */
1147
1148static struct Qdisc *qdisc_create(struct net_device *dev,
1149 struct netdev_queue *dev_queue,
1150 struct Qdisc *p, u32 parent, u32 handle,
1151 struct nlattr **tca, int *errp,
1152 struct netlink_ext_ack *extack)
1153{
1154 int err;
1155 struct nlattr *kind = tca[TCA_KIND];
1156 struct Qdisc *sch;
1157 struct Qdisc_ops *ops;
1158 struct qdisc_size_table *stab;
1159
1160 ops = qdisc_lookup_ops(kind);
1161#ifdef CONFIG_MODULES
1162 if (ops == NULL && kind != NULL) {
1163 char name[IFNAMSIZ];
1164 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
1165 /* We dropped the RTNL semaphore in order to
1166 * perform the module load. So, even if we
1167 * succeeded in loading the module we have to
1168 * tell the caller to replay the request. We
1169 * indicate this using -EAGAIN.
1170 * We replay the request because the device may
1171 * go away in the mean time.
1172 */
1173 rtnl_unlock();
1174 request_module("sch_%s", name);
1175 rtnl_lock();
1176 ops = qdisc_lookup_ops(kind);
1177 if (ops != NULL) {
1178 /* We will try again qdisc_lookup_ops,
1179 * so don't keep a reference.
1180 */
1181 module_put(ops->owner);
1182 err = -EAGAIN;
1183 goto err_out;
1184 }
1185 }
1186 }
1187#endif
1188
1189 err = -ENOENT;
1190 if (!ops) {
1191 NL_SET_ERR_MSG(extack, "Specified qdisc not found");
1192 goto err_out;
1193 }
1194
1195 sch = qdisc_alloc(dev_queue, ops, extack);
1196 if (IS_ERR(sch)) {
1197 err = PTR_ERR(sch);
1198 goto err_out2;
1199 }
1200
1201 sch->parent = parent;
1202
1203 if (handle == TC_H_INGRESS) {
1204 sch->flags |= TCQ_F_INGRESS;
1205 handle = TC_H_MAKE(TC_H_INGRESS, 0);
1206 } else {
1207 if (handle == 0) {
1208 handle = qdisc_alloc_handle(dev);
1209 if (handle == 0) {
1210 NL_SET_ERR_MSG(extack, "Maximum number of qdisc handles was exceeded");
1211 err = -ENOSPC;
1212 goto err_out3;
1213 }
1214 }
1215 if (!netif_is_multiqueue(dev))
1216 sch->flags |= TCQ_F_ONETXQUEUE;
1217 }
1218
1219 sch->handle = handle;
1220
1221 /* This exist to keep backward compatible with a userspace
1222 * loophole, what allowed userspace to get IFF_NO_QUEUE
1223 * facility on older kernels by setting tx_queue_len=0 (prior
1224 * to qdisc init), and then forgot to reinit tx_queue_len
1225 * before again attaching a qdisc.
1226 */
1227 if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) {
1228 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
1229 netdev_info(dev, "Caught tx_queue_len zero misconfig\n");
1230 }
1231
1232 err = qdisc_block_indexes_set(sch, tca, extack);
1233 if (err)
1234 goto err_out3;
1235
1236 if (ops->init) {
1237 err = ops->init(sch, tca[TCA_OPTIONS], extack);
1238 if (err != 0)
1239 goto err_out5;
1240 }
1241
1242 if (tca[TCA_STAB]) {
1243 stab = qdisc_get_stab(tca[TCA_STAB], extack);
1244 if (IS_ERR(stab)) {
1245 err = PTR_ERR(stab);
1246 goto err_out4;
1247 }
1248 rcu_assign_pointer(sch->stab, stab);
1249 }
1250 if (tca[TCA_RATE]) {
1251 seqcount_t *running;
1252
1253 err = -EOPNOTSUPP;
1254 if (sch->flags & TCQ_F_MQROOT) {
1255 NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc");
1256 goto err_out4;
1257 }
1258
1259 if (sch->parent != TC_H_ROOT &&
1260 !(sch->flags & TCQ_F_INGRESS) &&
1261 (!p || !(p->flags & TCQ_F_MQROOT)))
1262 running = qdisc_root_sleeping_running(sch);
1263 else
1264 running = &sch->running;
1265
1266 err = gen_new_estimator(&sch->bstats,
1267 sch->cpu_bstats,
1268 &sch->rate_est,
1269 NULL,
1270 running,
1271 tca[TCA_RATE]);
1272 if (err) {
1273 NL_SET_ERR_MSG(extack, "Failed to generate new estimator");
1274 goto err_out4;
1275 }
1276 }
1277
1278 qdisc_hash_add(sch, false);
1279
1280 return sch;
1281
1282err_out5:
1283 /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */
1284 if (ops->destroy)
1285 ops->destroy(sch);
1286err_out3:
1287 dev_put(dev);
1288 qdisc_free(sch);
1289err_out2:
1290 module_put(ops->owner);
1291err_out:
1292 *errp = err;
1293 return NULL;
1294
1295err_out4:
1296 /*
1297 * Any broken qdiscs that would require a ops->reset() here?
1298 * The qdisc was never in action so it shouldn't be necessary.
1299 */
1300 qdisc_put_stab(rtnl_dereference(sch->stab));
1301 if (ops->destroy)
1302 ops->destroy(sch);
1303 goto err_out3;
1304}
1305
1306static int qdisc_change(struct Qdisc *sch, struct nlattr **tca,
1307 struct netlink_ext_ack *extack)
1308{
1309 struct qdisc_size_table *ostab, *stab = NULL;
1310 int err = 0;
1311
1312 if (tca[TCA_OPTIONS]) {
1313 if (!sch->ops->change) {
1314 NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc");
1315 return -EINVAL;
1316 }
1317 if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
1318 NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
1319 return -EOPNOTSUPP;
1320 }
1321 err = sch->ops->change(sch, tca[TCA_OPTIONS], extack);
1322 if (err)
1323 return err;
1324 }
1325
1326 if (tca[TCA_STAB]) {
1327 stab = qdisc_get_stab(tca[TCA_STAB], extack);
1328 if (IS_ERR(stab))
1329 return PTR_ERR(stab);
1330 }
1331
1332 ostab = rtnl_dereference(sch->stab);
1333 rcu_assign_pointer(sch->stab, stab);
1334 qdisc_put_stab(ostab);
1335
1336 if (tca[TCA_RATE]) {
1337 /* NB: ignores errors from replace_estimator
1338 because change can't be undone. */
1339 if (sch->flags & TCQ_F_MQROOT)
1340 goto out;
1341 gen_replace_estimator(&sch->bstats,
1342 sch->cpu_bstats,
1343 &sch->rate_est,
1344 NULL,
1345 qdisc_root_sleeping_running(sch),
1346 tca[TCA_RATE]);
1347 }
1348out:
1349 return 0;
1350}
1351
1352struct check_loop_arg {
1353 struct qdisc_walker w;
1354 struct Qdisc *p;
1355 int depth;
1356};
1357
1358static int check_loop_fn(struct Qdisc *q, unsigned long cl,
1359 struct qdisc_walker *w);
1360
1361static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
1362{
1363 struct check_loop_arg arg;
1364
1365 if (q->ops->cl_ops == NULL)
1366 return 0;
1367
1368 arg.w.stop = arg.w.skip = arg.w.count = 0;
1369 arg.w.fn = check_loop_fn;
1370 arg.depth = depth;
1371 arg.p = p;
1372 q->ops->cl_ops->walk(q, &arg.w);
1373 return arg.w.stop ? -ELOOP : 0;
1374}
1375
1376static int
1377check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
1378{
1379 struct Qdisc *leaf;
1380 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1381 struct check_loop_arg *arg = (struct check_loop_arg *)w;
1382
1383 leaf = cops->leaf(q, cl);
1384 if (leaf) {
1385 if (leaf == arg->p || arg->depth > 7)
1386 return -ELOOP;
1387 return check_loop(leaf, arg->p, arg->depth + 1);
1388 }
1389 return 0;
1390}
1391
1392const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = {
1393 [TCA_KIND] = { .type = NLA_STRING },
1394 [TCA_RATE] = { .type = NLA_BINARY,
1395 .len = sizeof(struct tc_estimator) },
1396 [TCA_STAB] = { .type = NLA_NESTED },
1397 [TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG },
1398 [TCA_CHAIN] = { .type = NLA_U32 },
1399 [TCA_INGRESS_BLOCK] = { .type = NLA_U32 },
1400 [TCA_EGRESS_BLOCK] = { .type = NLA_U32 },
1401};
1402
1403/*
1404 * Delete/get qdisc.
1405 */
1406
1407static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
1408 struct netlink_ext_ack *extack)
1409{
1410 struct net *net = sock_net(skb->sk);
1411 struct tcmsg *tcm = nlmsg_data(n);
1412 struct nlattr *tca[TCA_MAX + 1];
1413 struct net_device *dev;
1414 u32 clid;
1415 struct Qdisc *q = NULL;
1416 struct Qdisc *p = NULL;
1417 int err;
1418
1419 if ((n->nlmsg_type != RTM_GETQDISC) &&
1420 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1421 return -EPERM;
1422
1423 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
1424 rtm_tca_policy, extack);
1425 if (err < 0)
1426 return err;
1427
1428 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1429 if (!dev)
1430 return -ENODEV;
1431
1432 clid = tcm->tcm_parent;
1433 if (clid) {
1434 if (clid != TC_H_ROOT) {
1435 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
1436 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1437 if (!p) {
1438 NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid");
1439 return -ENOENT;
1440 }
1441 q = qdisc_leaf(p, clid);
1442 } else if (dev_ingress_queue(dev)) {
1443 q = dev_ingress_queue(dev)->qdisc_sleeping;
1444 }
1445 } else {
1446 q = dev->qdisc;
1447 }
1448 if (!q) {
1449 NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device");
1450 return -ENOENT;
1451 }
1452
1453 if (tcm->tcm_handle && q->handle != tcm->tcm_handle) {
1454 NL_SET_ERR_MSG(extack, "Invalid handle");
1455 return -EINVAL;
1456 }
1457 } else {
1458 q = qdisc_lookup(dev, tcm->tcm_handle);
1459 if (!q) {
1460 NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle");
1461 return -ENOENT;
1462 }
1463 }
1464
1465 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1466 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1467 return -EINVAL;
1468 }
1469
1470 if (n->nlmsg_type == RTM_DELQDISC) {
1471 if (!clid) {
1472 NL_SET_ERR_MSG(extack, "Classid cannot be zero");
1473 return -EINVAL;
1474 }
1475 if (q->handle == 0) {
1476 NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero");
1477 return -ENOENT;
1478 }
1479 err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack);
1480 if (err != 0)
1481 return err;
1482 } else {
1483 qdisc_notify(net, skb, n, clid, NULL, q);
1484 }
1485 return 0;
1486}
1487
1488/*
1489 * Create/change qdisc.
1490 */
1491
1492static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
1493 struct netlink_ext_ack *extack)
1494{
1495 struct net *net = sock_net(skb->sk);
1496 struct tcmsg *tcm;
1497 struct nlattr *tca[TCA_MAX + 1];
1498 struct net_device *dev;
1499 u32 clid;
1500 struct Qdisc *q, *p;
1501 int err;
1502
1503 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1504 return -EPERM;
1505
1506replay:
1507 /* Reinit, just in case something touches this. */
1508 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
1509 rtm_tca_policy, extack);
1510 if (err < 0)
1511 return err;
1512
1513 tcm = nlmsg_data(n);
1514 clid = tcm->tcm_parent;
1515 q = p = NULL;
1516
1517 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1518 if (!dev)
1519 return -ENODEV;
1520
1521
1522 if (clid) {
1523 if (clid != TC_H_ROOT) {
1524 if (clid != TC_H_INGRESS) {
1525 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1526 if (!p) {
1527 NL_SET_ERR_MSG(extack, "Failed to find specified qdisc");
1528 return -ENOENT;
1529 }
1530 q = qdisc_leaf(p, clid);
1531 } else if (dev_ingress_queue_create(dev)) {
1532 q = dev_ingress_queue(dev)->qdisc_sleeping;
1533 }
1534 } else {
1535 q = dev->qdisc;
1536 }
1537
1538 /* It may be default qdisc, ignore it */
1539 if (q && q->handle == 0)
1540 q = NULL;
1541
1542 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1543 if (tcm->tcm_handle) {
1544 if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) {
1545 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override");
1546 return -EEXIST;
1547 }
1548 if (TC_H_MIN(tcm->tcm_handle)) {
1549 NL_SET_ERR_MSG(extack, "Invalid minor handle");
1550 return -EINVAL;
1551 }
1552 q = qdisc_lookup(dev, tcm->tcm_handle);
1553 if (!q)
1554 goto create_n_graft;
1555 if (n->nlmsg_flags & NLM_F_EXCL) {
1556 NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override");
1557 return -EEXIST;
1558 }
1559 if (tca[TCA_KIND] &&
1560 nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1561 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1562 return -EINVAL;
1563 }
1564 if (q == p ||
1565 (p && check_loop(q, p, 0))) {
1566 NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected");
1567 return -ELOOP;
1568 }
1569 qdisc_refcount_inc(q);
1570 goto graft;
1571 } else {
1572 if (!q)
1573 goto create_n_graft;
1574
1575 /* This magic test requires explanation.
1576 *
1577 * We know, that some child q is already
1578 * attached to this parent and have choice:
1579 * either to change it or to create/graft new one.
1580 *
1581 * 1. We are allowed to create/graft only
1582 * if CREATE and REPLACE flags are set.
1583 *
1584 * 2. If EXCL is set, requestor wanted to say,
1585 * that qdisc tcm_handle is not expected
1586 * to exist, so that we choose create/graft too.
1587 *
1588 * 3. The last case is when no flags are set.
1589 * Alas, it is sort of hole in API, we
1590 * cannot decide what to do unambiguously.
1591 * For now we select create/graft, if
1592 * user gave KIND, which does not match existing.
1593 */
1594 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1595 (n->nlmsg_flags & NLM_F_REPLACE) &&
1596 ((n->nlmsg_flags & NLM_F_EXCL) ||
1597 (tca[TCA_KIND] &&
1598 nla_strcmp(tca[TCA_KIND], q->ops->id))))
1599 goto create_n_graft;
1600 }
1601 }
1602 } else {
1603 if (!tcm->tcm_handle) {
1604 NL_SET_ERR_MSG(extack, "Handle cannot be zero");
1605 return -EINVAL;
1606 }
1607 q = qdisc_lookup(dev, tcm->tcm_handle);
1608 }
1609
1610 /* Change qdisc parameters */
1611 if (!q) {
1612 NL_SET_ERR_MSG(extack, "Specified qdisc not found");
1613 return -ENOENT;
1614 }
1615 if (n->nlmsg_flags & NLM_F_EXCL) {
1616 NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify");
1617 return -EEXIST;
1618 }
1619 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1620 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1621 return -EINVAL;
1622 }
1623 err = qdisc_change(q, tca, extack);
1624 if (err == 0)
1625 qdisc_notify(net, skb, n, clid, NULL, q);
1626 return err;
1627
1628create_n_graft:
1629 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1630 NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag");
1631 return -ENOENT;
1632 }
1633 if (clid == TC_H_INGRESS) {
1634 if (dev_ingress_queue(dev)) {
1635 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1636 tcm->tcm_parent, tcm->tcm_parent,
1637 tca, &err, extack);
1638 } else {
1639 NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device");
1640 err = -ENOENT;
1641 }
1642 } else {
1643 struct netdev_queue *dev_queue;
1644
1645 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1646 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1647 else if (p)
1648 dev_queue = p->dev_queue;
1649 else
1650 dev_queue = netdev_get_tx_queue(dev, 0);
1651
1652 q = qdisc_create(dev, dev_queue, p,
1653 tcm->tcm_parent, tcm->tcm_handle,
1654 tca, &err, extack);
1655 }
1656 if (q == NULL) {
1657 if (err == -EAGAIN)
1658 goto replay;
1659 return err;
1660 }
1661
1662graft:
1663 err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack);
1664 if (err) {
1665 if (q)
1666 qdisc_put(q);
1667 return err;
1668 }
1669
1670 return 0;
1671}
1672
1673static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1674 struct netlink_callback *cb,
1675 int *q_idx_p, int s_q_idx, bool recur,
1676 bool dump_invisible)
1677{
1678 int ret = 0, q_idx = *q_idx_p;
1679 struct Qdisc *q;
1680 int b;
1681
1682 if (!root)
1683 return 0;
1684
1685 q = root;
1686 if (q_idx < s_q_idx) {
1687 q_idx++;
1688 } else {
1689 if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1690 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1691 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1692 RTM_NEWQDISC) <= 0)
1693 goto done;
1694 q_idx++;
1695 }
1696
1697 /* If dumping singletons, there is no qdisc_dev(root) and the singleton
1698 * itself has already been dumped.
1699 *
1700 * If we've already dumped the top-level (ingress) qdisc above and the global
1701 * qdisc hashtable, we don't want to hit it again
1702 */
1703 if (!qdisc_dev(root) || !recur)
1704 goto out;
1705
1706 hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
1707 if (q_idx < s_q_idx) {
1708 q_idx++;
1709 continue;
1710 }
1711 if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1712 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1713 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1714 RTM_NEWQDISC) <= 0)
1715 goto done;
1716 q_idx++;
1717 }
1718
1719out:
1720 *q_idx_p = q_idx;
1721 return ret;
1722done:
1723 ret = -1;
1724 goto out;
1725}
1726
1727static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1728{
1729 struct net *net = sock_net(skb->sk);
1730 int idx, q_idx;
1731 int s_idx, s_q_idx;
1732 struct net_device *dev;
1733 const struct nlmsghdr *nlh = cb->nlh;
1734 struct nlattr *tca[TCA_MAX + 1];
1735 int err;
1736
1737 s_idx = cb->args[0];
1738 s_q_idx = q_idx = cb->args[1];
1739
1740 idx = 0;
1741 ASSERT_RTNL();
1742
1743 err = nlmsg_parse_deprecated(nlh, sizeof(struct tcmsg), tca, TCA_MAX,
1744 rtm_tca_policy, cb->extack);
1745 if (err < 0)
1746 return err;
1747
1748 for_each_netdev(net, dev) {
1749 struct netdev_queue *dev_queue;
1750
1751 if (idx < s_idx)
1752 goto cont;
1753 if (idx > s_idx)
1754 s_q_idx = 0;
1755 q_idx = 0;
1756
1757 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx,
1758 true, tca[TCA_DUMP_INVISIBLE]) < 0)
1759 goto done;
1760
1761 dev_queue = dev_ingress_queue(dev);
1762 if (dev_queue &&
1763 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1764 &q_idx, s_q_idx, false,
1765 tca[TCA_DUMP_INVISIBLE]) < 0)
1766 goto done;
1767
1768cont:
1769 idx++;
1770 }
1771
1772done:
1773 cb->args[0] = idx;
1774 cb->args[1] = q_idx;
1775
1776 return skb->len;
1777}
1778
1779
1780
1781/************************************************
1782 * Traffic classes manipulation. *
1783 ************************************************/
1784
1785static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1786 unsigned long cl,
1787 u32 portid, u32 seq, u16 flags, int event)
1788{
1789 struct tcmsg *tcm;
1790 struct nlmsghdr *nlh;
1791 unsigned char *b = skb_tail_pointer(skb);
1792 struct gnet_dump d;
1793 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1794
1795 cond_resched();
1796 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1797 if (!nlh)
1798 goto out_nlmsg_trim;
1799 tcm = nlmsg_data(nlh);
1800 tcm->tcm_family = AF_UNSPEC;
1801 tcm->tcm__pad1 = 0;
1802 tcm->tcm__pad2 = 0;
1803 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1804 tcm->tcm_parent = q->handle;
1805 tcm->tcm_handle = q->handle;
1806 tcm->tcm_info = 0;
1807 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1808 goto nla_put_failure;
1809 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1810 goto nla_put_failure;
1811
1812 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1813 NULL, &d, TCA_PAD) < 0)
1814 goto nla_put_failure;
1815
1816 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1817 goto nla_put_failure;
1818
1819 if (gnet_stats_finish_copy(&d) < 0)
1820 goto nla_put_failure;
1821
1822 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1823 return skb->len;
1824
1825out_nlmsg_trim:
1826nla_put_failure:
1827 nlmsg_trim(skb, b);
1828 return -1;
1829}
1830
1831static int tclass_notify(struct net *net, struct sk_buff *oskb,
1832 struct nlmsghdr *n, struct Qdisc *q,
1833 unsigned long cl, int event)
1834{
1835 struct sk_buff *skb;
1836 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1837 int err = 0;
1838
1839 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1840 if (!skb)
1841 return -ENOBUFS;
1842
1843 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
1844 kfree_skb(skb);
1845 return -EINVAL;
1846 }
1847
1848 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1849 n->nlmsg_flags & NLM_F_ECHO);
1850 if (err > 0)
1851 err = 0;
1852 return err;
1853}
1854
1855static int tclass_del_notify(struct net *net,
1856 const struct Qdisc_class_ops *cops,
1857 struct sk_buff *oskb, struct nlmsghdr *n,
1858 struct Qdisc *q, unsigned long cl)
1859{
1860 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1861 struct sk_buff *skb;
1862 int err = 0;
1863
1864 if (!cops->delete)
1865 return -EOPNOTSUPP;
1866
1867 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1868 if (!skb)
1869 return -ENOBUFS;
1870
1871 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
1872 RTM_DELTCLASS) < 0) {
1873 kfree_skb(skb);
1874 return -EINVAL;
1875 }
1876
1877 err = cops->delete(q, cl);
1878 if (err) {
1879 kfree_skb(skb);
1880 return err;
1881 }
1882
1883 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1884 n->nlmsg_flags & NLM_F_ECHO);
1885 if (err > 0)
1886 err = 0;
1887 return err;
1888}
1889
1890#ifdef CONFIG_NET_CLS
1891
1892struct tcf_bind_args {
1893 struct tcf_walker w;
1894 u32 classid;
1895 unsigned long cl;
1896};
1897
1898static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
1899{
1900 struct tcf_bind_args *a = (void *)arg;
1901
1902 if (tp->ops->bind_class) {
1903 struct Qdisc *q = tcf_block_q(tp->chain->block);
1904
1905 sch_tree_lock(q);
1906 tp->ops->bind_class(n, a->classid, a->cl);
1907 sch_tree_unlock(q);
1908 }
1909 return 0;
1910}
1911
1912static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
1913 unsigned long new_cl)
1914{
1915 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1916 struct tcf_block *block;
1917 struct tcf_chain *chain;
1918 unsigned long cl;
1919
1920 cl = cops->find(q, portid);
1921 if (!cl)
1922 return;
1923 if (!cops->tcf_block)
1924 return;
1925 block = cops->tcf_block(q, cl, NULL);
1926 if (!block)
1927 return;
1928 for (chain = tcf_get_next_chain(block, NULL);
1929 chain;
1930 chain = tcf_get_next_chain(block, chain)) {
1931 struct tcf_proto *tp;
1932
1933 for (tp = tcf_get_next_proto(chain, NULL, true);
1934 tp; tp = tcf_get_next_proto(chain, tp, true)) {
1935 struct tcf_bind_args arg = {};
1936
1937 arg.w.fn = tcf_node_bind;
1938 arg.classid = clid;
1939 arg.cl = new_cl;
1940 tp->ops->walk(tp, &arg.w, true);
1941 }
1942 }
1943}
1944
1945#else
1946
1947static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
1948 unsigned long new_cl)
1949{
1950}
1951
1952#endif
1953
1954static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
1955 struct netlink_ext_ack *extack)
1956{
1957 struct net *net = sock_net(skb->sk);
1958 struct tcmsg *tcm = nlmsg_data(n);
1959 struct nlattr *tca[TCA_MAX + 1];
1960 struct net_device *dev;
1961 struct Qdisc *q = NULL;
1962 const struct Qdisc_class_ops *cops;
1963 unsigned long cl = 0;
1964 unsigned long new_cl;
1965 u32 portid;
1966 u32 clid;
1967 u32 qid;
1968 int err;
1969
1970 if ((n->nlmsg_type != RTM_GETTCLASS) &&
1971 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1972 return -EPERM;
1973
1974 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
1975 rtm_tca_policy, extack);
1976 if (err < 0)
1977 return err;
1978
1979 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1980 if (!dev)
1981 return -ENODEV;
1982
1983 /*
1984 parent == TC_H_UNSPEC - unspecified parent.
1985 parent == TC_H_ROOT - class is root, which has no parent.
1986 parent == X:0 - parent is root class.
1987 parent == X:Y - parent is a node in hierarchy.
1988 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1989
1990 handle == 0:0 - generate handle from kernel pool.
1991 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1992 handle == X:Y - clear.
1993 handle == X:0 - root class.
1994 */
1995
1996 /* Step 1. Determine qdisc handle X:0 */
1997
1998 portid = tcm->tcm_parent;
1999 clid = tcm->tcm_handle;
2000 qid = TC_H_MAJ(clid);
2001
2002 if (portid != TC_H_ROOT) {
2003 u32 qid1 = TC_H_MAJ(portid);
2004
2005 if (qid && qid1) {
2006 /* If both majors are known, they must be identical. */
2007 if (qid != qid1)
2008 return -EINVAL;
2009 } else if (qid1) {
2010 qid = qid1;
2011 } else if (qid == 0)
2012 qid = dev->qdisc->handle;
2013
2014 /* Now qid is genuine qdisc handle consistent
2015 * both with parent and child.
2016 *
2017 * TC_H_MAJ(portid) still may be unspecified, complete it now.
2018 */
2019 if (portid)
2020 portid = TC_H_MAKE(qid, portid);
2021 } else {
2022 if (qid == 0)
2023 qid = dev->qdisc->handle;
2024 }
2025
2026 /* OK. Locate qdisc */
2027 q = qdisc_lookup(dev, qid);
2028 if (!q)
2029 return -ENOENT;
2030
2031 /* An check that it supports classes */
2032 cops = q->ops->cl_ops;
2033 if (cops == NULL)
2034 return -EINVAL;
2035
2036 /* Now try to get class */
2037 if (clid == 0) {
2038 if (portid == TC_H_ROOT)
2039 clid = qid;
2040 } else
2041 clid = TC_H_MAKE(qid, clid);
2042
2043 if (clid)
2044 cl = cops->find(q, clid);
2045
2046 if (cl == 0) {
2047 err = -ENOENT;
2048 if (n->nlmsg_type != RTM_NEWTCLASS ||
2049 !(n->nlmsg_flags & NLM_F_CREATE))
2050 goto out;
2051 } else {
2052 switch (n->nlmsg_type) {
2053 case RTM_NEWTCLASS:
2054 err = -EEXIST;
2055 if (n->nlmsg_flags & NLM_F_EXCL)
2056 goto out;
2057 break;
2058 case RTM_DELTCLASS:
2059 err = tclass_del_notify(net, cops, skb, n, q, cl);
2060 /* Unbind the class with flilters with 0 */
2061 tc_bind_tclass(q, portid, clid, 0);
2062 goto out;
2063 case RTM_GETTCLASS:
2064 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
2065 goto out;
2066 default:
2067 err = -EINVAL;
2068 goto out;
2069 }
2070 }
2071
2072 if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
2073 NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes");
2074 return -EOPNOTSUPP;
2075 }
2076
2077 new_cl = cl;
2078 err = -EOPNOTSUPP;
2079 if (cops->change)
2080 err = cops->change(q, clid, portid, tca, &new_cl, extack);
2081 if (err == 0) {
2082 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
2083 /* We just create a new class, need to do reverse binding. */
2084 if (cl != new_cl)
2085 tc_bind_tclass(q, portid, clid, new_cl);
2086 }
2087out:
2088 return err;
2089}
2090
2091struct qdisc_dump_args {
2092 struct qdisc_walker w;
2093 struct sk_buff *skb;
2094 struct netlink_callback *cb;
2095};
2096
2097static int qdisc_class_dump(struct Qdisc *q, unsigned long cl,
2098 struct qdisc_walker *arg)
2099{
2100 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
2101
2102 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
2103 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2104 RTM_NEWTCLASS);
2105}
2106
2107static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
2108 struct tcmsg *tcm, struct netlink_callback *cb,
2109 int *t_p, int s_t)
2110{
2111 struct qdisc_dump_args arg;
2112
2113 if (tc_qdisc_dump_ignore(q, false) ||
2114 *t_p < s_t || !q->ops->cl_ops ||
2115 (tcm->tcm_parent &&
2116 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
2117 (*t_p)++;
2118 return 0;
2119 }
2120 if (*t_p > s_t)
2121 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
2122 arg.w.fn = qdisc_class_dump;
2123 arg.skb = skb;
2124 arg.cb = cb;
2125 arg.w.stop = 0;
2126 arg.w.skip = cb->args[1];
2127 arg.w.count = 0;
2128 q->ops->cl_ops->walk(q, &arg.w);
2129 cb->args[1] = arg.w.count;
2130 if (arg.w.stop)
2131 return -1;
2132 (*t_p)++;
2133 return 0;
2134}
2135
2136static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
2137 struct tcmsg *tcm, struct netlink_callback *cb,
2138 int *t_p, int s_t)
2139{
2140 struct Qdisc *q;
2141 int b;
2142
2143 if (!root)
2144 return 0;
2145
2146 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
2147 return -1;
2148
2149 if (!qdisc_dev(root))
2150 return 0;
2151
2152 if (tcm->tcm_parent) {
2153 q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent));
2154 if (q && q != root &&
2155 tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
2156 return -1;
2157 return 0;
2158 }
2159 hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
2160 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
2161 return -1;
2162 }
2163
2164 return 0;
2165}
2166
2167static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
2168{
2169 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2170 struct net *net = sock_net(skb->sk);
2171 struct netdev_queue *dev_queue;
2172 struct net_device *dev;
2173 int t, s_t;
2174
2175 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2176 return 0;
2177 dev = dev_get_by_index(net, tcm->tcm_ifindex);
2178 if (!dev)
2179 return 0;
2180
2181 s_t = cb->args[0];
2182 t = 0;
2183
2184 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
2185 goto done;
2186
2187 dev_queue = dev_ingress_queue(dev);
2188 if (dev_queue &&
2189 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
2190 &t, s_t) < 0)
2191 goto done;
2192
2193done:
2194 cb->args[0] = t;
2195
2196 dev_put(dev);
2197 return skb->len;
2198}
2199
2200#ifdef CONFIG_PROC_FS
2201static int psched_show(struct seq_file *seq, void *v)
2202{
2203 seq_printf(seq, "%08x %08x %08x %08x\n",
2204 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
2205 1000000,
2206 (u32)NSEC_PER_SEC / hrtimer_resolution);
2207
2208 return 0;
2209}
2210
2211static int __net_init psched_net_init(struct net *net)
2212{
2213 struct proc_dir_entry *e;
2214
2215 e = proc_create_single("psched", 0, net->proc_net, psched_show);
2216 if (e == NULL)
2217 return -ENOMEM;
2218
2219 return 0;
2220}
2221
2222static void __net_exit psched_net_exit(struct net *net)
2223{
2224 remove_proc_entry("psched", net->proc_net);
2225}
2226#else
2227static int __net_init psched_net_init(struct net *net)
2228{
2229 return 0;
2230}
2231
2232static void __net_exit psched_net_exit(struct net *net)
2233{
2234}
2235#endif
2236
2237static struct pernet_operations psched_net_ops = {
2238 .init = psched_net_init,
2239 .exit = psched_net_exit,
2240};
2241
2242static int __init pktsched_init(void)
2243{
2244 int err;
2245
2246 err = register_pernet_subsys(&psched_net_ops);
2247 if (err) {
2248 pr_err("pktsched_init: "
2249 "cannot initialize per netns operations\n");
2250 return err;
2251 }
2252
2253 register_qdisc(&pfifo_fast_ops);
2254 register_qdisc(&pfifo_qdisc_ops);
2255 register_qdisc(&bfifo_qdisc_ops);
2256 register_qdisc(&pfifo_head_drop_qdisc_ops);
2257 register_qdisc(&mq_qdisc_ops);
2258 register_qdisc(&noqueue_qdisc_ops);
2259
2260 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0);
2261 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0);
2262 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc,
2263 0);
2264 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0);
2265 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0);
2266 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass,
2267 0);
2268
2269 return 0;
2270}
2271
2272subsys_initcall(pktsched_init);
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
33#include <net/net_namespace.h>
34#include <net/sock.h>
35#include <net/netlink.h>
36#include <net/pkt_sched.h>
37
38static int qdisc_notify(struct net *net, struct sk_buff *oskb,
39 struct nlmsghdr *n, u32 clid,
40 struct Qdisc *old, struct Qdisc *new);
41static int tclass_notify(struct net *net, struct sk_buff *oskb,
42 struct nlmsghdr *n, struct Qdisc *q,
43 unsigned long cl, int event);
44
45/*
46
47 Short review.
48 -------------
49
50 This file consists of two interrelated parts:
51
52 1. queueing disciplines manager frontend.
53 2. traffic classes manager frontend.
54
55 Generally, queueing discipline ("qdisc") is a black box,
56 which is able to enqueue packets and to dequeue them (when
57 device is ready to send something) in order and at times
58 determined by algorithm hidden in it.
59
60 qdisc's are divided to two categories:
61 - "queues", which have no internal structure visible from outside.
62 - "schedulers", which split all the packets to "traffic classes",
63 using "packet classifiers" (look at cls_api.c)
64
65 In turn, classes may have child qdiscs (as rule, queues)
66 attached to them etc. etc. etc.
67
68 The goal of the routines in this file is to translate
69 information supplied by user in the form of handles
70 to more intelligible for kernel form, to make some sanity
71 checks and part of work, which is common to all qdiscs
72 and to provide rtnetlink notifications.
73
74 All real intelligent work is done inside qdisc modules.
75
76
77
78 Every discipline has two major routines: enqueue and dequeue.
79
80 ---dequeue
81
82 dequeue usually returns a skb to send. It is allowed to return NULL,
83 but it does not mean that queue is empty, it just means that
84 discipline does not want to send anything this time.
85 Queue is really empty if q->q.qlen == 0.
86 For complicated disciplines with multiple queues q->q is not
87 real packet queue, but however q->q.qlen must be valid.
88
89 ---enqueue
90
91 enqueue returns 0, if packet was enqueued successfully.
92 If packet (this one or another one) was dropped, it returns
93 not zero error code.
94 NET_XMIT_DROP - this packet dropped
95 Expected action: do not backoff, but wait until queue will clear.
96 NET_XMIT_CN - probably this packet enqueued, but another one dropped.
97 Expected action: backoff or ignore
98 NET_XMIT_POLICED - dropped by police.
99 Expected action: backoff or error to real-time apps.
100
101 Auxiliary routines:
102
103 ---peek
104
105 like dequeue but without removing a packet from the queue
106
107 ---reset
108
109 returns qdisc to initial state: purge all buffers, clear all
110 timers, counters (except for statistics) etc.
111
112 ---init
113
114 initializes newly created qdisc.
115
116 ---destroy
117
118 destroys resources allocated by init and during lifetime of qdisc.
119
120 ---change
121
122 changes qdisc parameters.
123 */
124
125/* Protects list of registered TC modules. It is pure SMP lock. */
126static DEFINE_RWLOCK(qdisc_mod_lock);
127
128
129/************************************************
130 * Queueing disciplines manipulation. *
131 ************************************************/
132
133
134/* The list of all installed queueing disciplines. */
135
136static struct Qdisc_ops *qdisc_base;
137
138/* Register/unregister queueing discipline */
139
140int register_qdisc(struct Qdisc_ops *qops)
141{
142 struct Qdisc_ops *q, **qp;
143 int rc = -EEXIST;
144
145 write_lock(&qdisc_mod_lock);
146 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
147 if (!strcmp(qops->id, q->id))
148 goto out;
149
150 if (qops->enqueue == NULL)
151 qops->enqueue = noop_qdisc_ops.enqueue;
152 if (qops->peek == NULL) {
153 if (qops->dequeue == NULL)
154 qops->peek = noop_qdisc_ops.peek;
155 else
156 goto out_einval;
157 }
158 if (qops->dequeue == NULL)
159 qops->dequeue = noop_qdisc_ops.dequeue;
160
161 if (qops->cl_ops) {
162 const struct Qdisc_class_ops *cops = qops->cl_ops;
163
164 if (!(cops->get && cops->put && cops->walk && cops->leaf))
165 goto out_einval;
166
167 if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf))
168 goto out_einval;
169 }
170
171 qops->next = NULL;
172 *qp = qops;
173 rc = 0;
174out:
175 write_unlock(&qdisc_mod_lock);
176 return rc;
177
178out_einval:
179 rc = -EINVAL;
180 goto out;
181}
182EXPORT_SYMBOL(register_qdisc);
183
184int unregister_qdisc(struct Qdisc_ops *qops)
185{
186 struct Qdisc_ops *q, **qp;
187 int err = -ENOENT;
188
189 write_lock(&qdisc_mod_lock);
190 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
191 if (q == qops)
192 break;
193 if (q) {
194 *qp = q->next;
195 q->next = NULL;
196 err = 0;
197 }
198 write_unlock(&qdisc_mod_lock);
199 return err;
200}
201EXPORT_SYMBOL(unregister_qdisc);
202
203/* Get default qdisc if not otherwise specified */
204void qdisc_get_default(char *name, size_t len)
205{
206 read_lock(&qdisc_mod_lock);
207 strlcpy(name, default_qdisc_ops->id, len);
208 read_unlock(&qdisc_mod_lock);
209}
210
211static struct Qdisc_ops *qdisc_lookup_default(const char *name)
212{
213 struct Qdisc_ops *q = NULL;
214
215 for (q = qdisc_base; q; q = q->next) {
216 if (!strcmp(name, q->id)) {
217 if (!try_module_get(q->owner))
218 q = NULL;
219 break;
220 }
221 }
222
223 return q;
224}
225
226/* Set new default qdisc to use */
227int qdisc_set_default(const char *name)
228{
229 const struct Qdisc_ops *ops;
230
231 if (!capable(CAP_NET_ADMIN))
232 return -EPERM;
233
234 write_lock(&qdisc_mod_lock);
235 ops = qdisc_lookup_default(name);
236 if (!ops) {
237 /* Not found, drop lock and try to load module */
238 write_unlock(&qdisc_mod_lock);
239 request_module("sch_%s", name);
240 write_lock(&qdisc_mod_lock);
241
242 ops = qdisc_lookup_default(name);
243 }
244
245 if (ops) {
246 /* Set new default */
247 module_put(default_qdisc_ops->owner);
248 default_qdisc_ops = ops;
249 }
250 write_unlock(&qdisc_mod_lock);
251
252 return ops ? 0 : -ENOENT;
253}
254
255/* We know handle. Find qdisc among all qdisc's attached to device
256 (root qdisc, all its children, children of children etc.)
257 */
258
259static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
260{
261 struct Qdisc *q;
262
263 if (!(root->flags & TCQ_F_BUILTIN) &&
264 root->handle == handle)
265 return root;
266
267 list_for_each_entry(q, &root->list, list) {
268 if (q->handle == handle)
269 return q;
270 }
271 return NULL;
272}
273
274void qdisc_list_add(struct Qdisc *q)
275{
276 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
277 struct Qdisc *root = qdisc_dev(q)->qdisc;
278
279 WARN_ON_ONCE(root == &noop_qdisc);
280 list_add_tail(&q->list, &root->list);
281 }
282}
283EXPORT_SYMBOL(qdisc_list_add);
284
285void qdisc_list_del(struct Qdisc *q)
286{
287 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
288 list_del(&q->list);
289}
290EXPORT_SYMBOL(qdisc_list_del);
291
292struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
293{
294 struct Qdisc *q;
295
296 q = qdisc_match_from_root(dev->qdisc, handle);
297 if (q)
298 goto out;
299
300 if (dev_ingress_queue(dev))
301 q = qdisc_match_from_root(
302 dev_ingress_queue(dev)->qdisc_sleeping,
303 handle);
304out:
305 return q;
306}
307
308static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
309{
310 unsigned long cl;
311 struct Qdisc *leaf;
312 const struct Qdisc_class_ops *cops = p->ops->cl_ops;
313
314 if (cops == NULL)
315 return NULL;
316 cl = cops->get(p, classid);
317
318 if (cl == 0)
319 return NULL;
320 leaf = cops->leaf(p, cl);
321 cops->put(p, cl);
322 return leaf;
323}
324
325/* Find queueing discipline by name */
326
327static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
328{
329 struct Qdisc_ops *q = NULL;
330
331 if (kind) {
332 read_lock(&qdisc_mod_lock);
333 for (q = qdisc_base; q; q = q->next) {
334 if (nla_strcmp(kind, q->id) == 0) {
335 if (!try_module_get(q->owner))
336 q = NULL;
337 break;
338 }
339 }
340 read_unlock(&qdisc_mod_lock);
341 }
342 return q;
343}
344
345/* The linklayer setting were not transferred from iproute2, in older
346 * versions, and the rate tables lookup systems have been dropped in
347 * the kernel. To keep backward compatible with older iproute2 tc
348 * utils, we detect the linklayer setting by detecting if the rate
349 * table were modified.
350 *
351 * For linklayer ATM table entries, the rate table will be aligned to
352 * 48 bytes, thus some table entries will contain the same value. The
353 * mpu (min packet unit) is also encoded into the old rate table, thus
354 * starting from the mpu, we find low and high table entries for
355 * mapping this cell. If these entries contain the same value, when
356 * the rate tables have been modified for linklayer ATM.
357 *
358 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
359 * and then roundup to the next cell, calc the table entry one below,
360 * and compare.
361 */
362static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
363{
364 int low = roundup(r->mpu, 48);
365 int high = roundup(low+1, 48);
366 int cell_low = low >> r->cell_log;
367 int cell_high = (high >> r->cell_log) - 1;
368
369 /* rtab is too inaccurate at rates > 100Mbit/s */
370 if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
371 pr_debug("TC linklayer: Giving up ATM detection\n");
372 return TC_LINKLAYER_ETHERNET;
373 }
374
375 if ((cell_high > cell_low) && (cell_high < 256)
376 && (rtab[cell_low] == rtab[cell_high])) {
377 pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
378 cell_low, cell_high, rtab[cell_high]);
379 return TC_LINKLAYER_ATM;
380 }
381 return TC_LINKLAYER_ETHERNET;
382}
383
384static struct qdisc_rate_table *qdisc_rtab_list;
385
386struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab)
387{
388 struct qdisc_rate_table *rtab;
389
390 if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
391 nla_len(tab) != TC_RTAB_SIZE)
392 return NULL;
393
394 for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
395 if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) &&
396 !memcmp(&rtab->data, nla_data(tab), 1024)) {
397 rtab->refcnt++;
398 return rtab;
399 }
400 }
401
402 rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
403 if (rtab) {
404 rtab->rate = *r;
405 rtab->refcnt = 1;
406 memcpy(rtab->data, nla_data(tab), 1024);
407 if (r->linklayer == TC_LINKLAYER_UNAWARE)
408 r->linklayer = __detect_linklayer(r, rtab->data);
409 rtab->next = qdisc_rtab_list;
410 qdisc_rtab_list = rtab;
411 }
412 return rtab;
413}
414EXPORT_SYMBOL(qdisc_get_rtab);
415
416void qdisc_put_rtab(struct qdisc_rate_table *tab)
417{
418 struct qdisc_rate_table *rtab, **rtabp;
419
420 if (!tab || --tab->refcnt)
421 return;
422
423 for (rtabp = &qdisc_rtab_list;
424 (rtab = *rtabp) != NULL;
425 rtabp = &rtab->next) {
426 if (rtab == tab) {
427 *rtabp = rtab->next;
428 kfree(rtab);
429 return;
430 }
431 }
432}
433EXPORT_SYMBOL(qdisc_put_rtab);
434
435static LIST_HEAD(qdisc_stab_list);
436static DEFINE_SPINLOCK(qdisc_stab_lock);
437
438static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
439 [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
440 [TCA_STAB_DATA] = { .type = NLA_BINARY },
441};
442
443static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
444{
445 struct nlattr *tb[TCA_STAB_MAX + 1];
446 struct qdisc_size_table *stab;
447 struct tc_sizespec *s;
448 unsigned int tsize = 0;
449 u16 *tab = NULL;
450 int err;
451
452 err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy);
453 if (err < 0)
454 return ERR_PTR(err);
455 if (!tb[TCA_STAB_BASE])
456 return ERR_PTR(-EINVAL);
457
458 s = nla_data(tb[TCA_STAB_BASE]);
459
460 if (s->tsize > 0) {
461 if (!tb[TCA_STAB_DATA])
462 return ERR_PTR(-EINVAL);
463 tab = nla_data(tb[TCA_STAB_DATA]);
464 tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
465 }
466
467 if (tsize != s->tsize || (!tab && tsize > 0))
468 return ERR_PTR(-EINVAL);
469
470 spin_lock(&qdisc_stab_lock);
471
472 list_for_each_entry(stab, &qdisc_stab_list, list) {
473 if (memcmp(&stab->szopts, s, sizeof(*s)))
474 continue;
475 if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
476 continue;
477 stab->refcnt++;
478 spin_unlock(&qdisc_stab_lock);
479 return stab;
480 }
481
482 spin_unlock(&qdisc_stab_lock);
483
484 stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
485 if (!stab)
486 return ERR_PTR(-ENOMEM);
487
488 stab->refcnt = 1;
489 stab->szopts = *s;
490 if (tsize > 0)
491 memcpy(stab->data, tab, tsize * sizeof(u16));
492
493 spin_lock(&qdisc_stab_lock);
494 list_add_tail(&stab->list, &qdisc_stab_list);
495 spin_unlock(&qdisc_stab_lock);
496
497 return stab;
498}
499
500static void stab_kfree_rcu(struct rcu_head *head)
501{
502 kfree(container_of(head, struct qdisc_size_table, rcu));
503}
504
505void qdisc_put_stab(struct qdisc_size_table *tab)
506{
507 if (!tab)
508 return;
509
510 spin_lock(&qdisc_stab_lock);
511
512 if (--tab->refcnt == 0) {
513 list_del(&tab->list);
514 call_rcu_bh(&tab->rcu, stab_kfree_rcu);
515 }
516
517 spin_unlock(&qdisc_stab_lock);
518}
519EXPORT_SYMBOL(qdisc_put_stab);
520
521static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
522{
523 struct nlattr *nest;
524
525 nest = nla_nest_start(skb, TCA_STAB);
526 if (nest == NULL)
527 goto nla_put_failure;
528 if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
529 goto nla_put_failure;
530 nla_nest_end(skb, nest);
531
532 return skb->len;
533
534nla_put_failure:
535 return -1;
536}
537
538void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab)
539{
540 int pkt_len, slot;
541
542 pkt_len = skb->len + stab->szopts.overhead;
543 if (unlikely(!stab->szopts.tsize))
544 goto out;
545
546 slot = pkt_len + stab->szopts.cell_align;
547 if (unlikely(slot < 0))
548 slot = 0;
549
550 slot >>= stab->szopts.cell_log;
551 if (likely(slot < stab->szopts.tsize))
552 pkt_len = stab->data[slot];
553 else
554 pkt_len = stab->data[stab->szopts.tsize - 1] *
555 (slot / stab->szopts.tsize) +
556 stab->data[slot % stab->szopts.tsize];
557
558 pkt_len <<= stab->szopts.size_log;
559out:
560 if (unlikely(pkt_len < 1))
561 pkt_len = 1;
562 qdisc_skb_cb(skb)->pkt_len = pkt_len;
563}
564EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
565
566void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc)
567{
568 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
569 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
570 txt, qdisc->ops->id, qdisc->handle >> 16);
571 qdisc->flags |= TCQ_F_WARN_NONWC;
572 }
573}
574EXPORT_SYMBOL(qdisc_warn_nonwc);
575
576static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
577{
578 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
579 timer);
580
581 qdisc_unthrottled(wd->qdisc);
582 __netif_schedule(qdisc_root(wd->qdisc));
583
584 return HRTIMER_NORESTART;
585}
586
587void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
588{
589 hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
590 wd->timer.function = qdisc_watchdog;
591 wd->qdisc = qdisc;
592}
593EXPORT_SYMBOL(qdisc_watchdog_init);
594
595void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
596{
597 if (test_bit(__QDISC_STATE_DEACTIVATED,
598 &qdisc_root_sleeping(wd->qdisc)->state))
599 return;
600
601 qdisc_throttled(wd->qdisc);
602
603 hrtimer_start(&wd->timer,
604 ns_to_ktime(expires),
605 HRTIMER_MODE_ABS);
606}
607EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);
608
609void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
610{
611 hrtimer_cancel(&wd->timer);
612 qdisc_unthrottled(wd->qdisc);
613}
614EXPORT_SYMBOL(qdisc_watchdog_cancel);
615
616static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
617{
618 unsigned int size = n * sizeof(struct hlist_head), i;
619 struct hlist_head *h;
620
621 if (size <= PAGE_SIZE)
622 h = kmalloc(size, GFP_KERNEL);
623 else
624 h = (struct hlist_head *)
625 __get_free_pages(GFP_KERNEL, get_order(size));
626
627 if (h != NULL) {
628 for (i = 0; i < n; i++)
629 INIT_HLIST_HEAD(&h[i]);
630 }
631 return h;
632}
633
634static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n)
635{
636 unsigned int size = n * sizeof(struct hlist_head);
637
638 if (size <= PAGE_SIZE)
639 kfree(h);
640 else
641 free_pages((unsigned long)h, get_order(size));
642}
643
644void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
645{
646 struct Qdisc_class_common *cl;
647 struct hlist_node *next;
648 struct hlist_head *nhash, *ohash;
649 unsigned int nsize, nmask, osize;
650 unsigned int i, h;
651
652 /* Rehash when load factor exceeds 0.75 */
653 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
654 return;
655 nsize = clhash->hashsize * 2;
656 nmask = nsize - 1;
657 nhash = qdisc_class_hash_alloc(nsize);
658 if (nhash == NULL)
659 return;
660
661 ohash = clhash->hash;
662 osize = clhash->hashsize;
663
664 sch_tree_lock(sch);
665 for (i = 0; i < osize; i++) {
666 hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
667 h = qdisc_class_hash(cl->classid, nmask);
668 hlist_add_head(&cl->hnode, &nhash[h]);
669 }
670 }
671 clhash->hash = nhash;
672 clhash->hashsize = nsize;
673 clhash->hashmask = nmask;
674 sch_tree_unlock(sch);
675
676 qdisc_class_hash_free(ohash, osize);
677}
678EXPORT_SYMBOL(qdisc_class_hash_grow);
679
680int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
681{
682 unsigned int size = 4;
683
684 clhash->hash = qdisc_class_hash_alloc(size);
685 if (clhash->hash == NULL)
686 return -ENOMEM;
687 clhash->hashsize = size;
688 clhash->hashmask = size - 1;
689 clhash->hashelems = 0;
690 return 0;
691}
692EXPORT_SYMBOL(qdisc_class_hash_init);
693
694void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
695{
696 qdisc_class_hash_free(clhash->hash, clhash->hashsize);
697}
698EXPORT_SYMBOL(qdisc_class_hash_destroy);
699
700void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
701 struct Qdisc_class_common *cl)
702{
703 unsigned int h;
704
705 INIT_HLIST_NODE(&cl->hnode);
706 h = qdisc_class_hash(cl->classid, clhash->hashmask);
707 hlist_add_head(&cl->hnode, &clhash->hash[h]);
708 clhash->hashelems++;
709}
710EXPORT_SYMBOL(qdisc_class_hash_insert);
711
712void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
713 struct Qdisc_class_common *cl)
714{
715 hlist_del(&cl->hnode);
716 clhash->hashelems--;
717}
718EXPORT_SYMBOL(qdisc_class_hash_remove);
719
720/* Allocate an unique handle from space managed by kernel
721 * Possible range is [8000-FFFF]:0000 (0x8000 values)
722 */
723static u32 qdisc_alloc_handle(struct net_device *dev)
724{
725 int i = 0x8000;
726 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
727
728 do {
729 autohandle += TC_H_MAKE(0x10000U, 0);
730 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
731 autohandle = TC_H_MAKE(0x80000000U, 0);
732 if (!qdisc_lookup(dev, autohandle))
733 return autohandle;
734 cond_resched();
735 } while (--i > 0);
736
737 return 0;
738}
739
740void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
741{
742 const struct Qdisc_class_ops *cops;
743 unsigned long cl;
744 u32 parentid;
745 int drops;
746
747 if (n == 0)
748 return;
749 drops = max_t(int, n, 0);
750 while ((parentid = sch->parent)) {
751 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
752 return;
753
754 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
755 if (sch == NULL) {
756 WARN_ON(parentid != TC_H_ROOT);
757 return;
758 }
759 cops = sch->ops->cl_ops;
760 if (cops->qlen_notify) {
761 cl = cops->get(sch, parentid);
762 cops->qlen_notify(sch, cl);
763 cops->put(sch, cl);
764 }
765 sch->q.qlen -= n;
766 sch->qstats.drops += drops;
767 }
768}
769EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
770
771static void notify_and_destroy(struct net *net, struct sk_buff *skb,
772 struct nlmsghdr *n, u32 clid,
773 struct Qdisc *old, struct Qdisc *new)
774{
775 if (new || old)
776 qdisc_notify(net, skb, n, clid, old, new);
777
778 if (old)
779 qdisc_destroy(old);
780}
781
782/* Graft qdisc "new" to class "classid" of qdisc "parent" or
783 * to device "dev".
784 *
785 * When appropriate send a netlink notification using 'skb'
786 * and "n".
787 *
788 * On success, destroy old qdisc.
789 */
790
791static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
792 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
793 struct Qdisc *new, struct Qdisc *old)
794{
795 struct Qdisc *q = old;
796 struct net *net = dev_net(dev);
797 int err = 0;
798
799 if (parent == NULL) {
800 unsigned int i, num_q, ingress;
801
802 ingress = 0;
803 num_q = dev->num_tx_queues;
804 if ((q && q->flags & TCQ_F_INGRESS) ||
805 (new && new->flags & TCQ_F_INGRESS)) {
806 num_q = 1;
807 ingress = 1;
808 if (!dev_ingress_queue(dev))
809 return -ENOENT;
810 }
811
812 if (dev->flags & IFF_UP)
813 dev_deactivate(dev);
814
815 if (new && new->ops->attach) {
816 new->ops->attach(new);
817 num_q = 0;
818 }
819
820 for (i = 0; i < num_q; i++) {
821 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
822
823 if (!ingress)
824 dev_queue = netdev_get_tx_queue(dev, i);
825
826 old = dev_graft_qdisc(dev_queue, new);
827 if (new && i > 0)
828 atomic_inc(&new->refcnt);
829
830 if (!ingress)
831 qdisc_destroy(old);
832 }
833
834 if (!ingress) {
835 notify_and_destroy(net, skb, n, classid,
836 dev->qdisc, new);
837 if (new && !new->ops->attach)
838 atomic_inc(&new->refcnt);
839 dev->qdisc = new ? : &noop_qdisc;
840 } else {
841 notify_and_destroy(net, skb, n, classid, old, new);
842 }
843
844 if (dev->flags & IFF_UP)
845 dev_activate(dev);
846 } else {
847 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
848
849 err = -EOPNOTSUPP;
850 if (cops && cops->graft) {
851 unsigned long cl = cops->get(parent, classid);
852 if (cl) {
853 err = cops->graft(parent, cl, new, &old);
854 cops->put(parent, cl);
855 } else
856 err = -ENOENT;
857 }
858 if (!err)
859 notify_and_destroy(net, skb, n, classid, old, new);
860 }
861 return err;
862}
863
864/* lockdep annotation is needed for ingress; egress gets it only for name */
865static struct lock_class_key qdisc_tx_lock;
866static struct lock_class_key qdisc_rx_lock;
867
868/*
869 Allocate and initialize new qdisc.
870
871 Parameters are passed via opt.
872 */
873
874static struct Qdisc *
875qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
876 struct Qdisc *p, u32 parent, u32 handle,
877 struct nlattr **tca, int *errp)
878{
879 int err;
880 struct nlattr *kind = tca[TCA_KIND];
881 struct Qdisc *sch;
882 struct Qdisc_ops *ops;
883 struct qdisc_size_table *stab;
884
885 ops = qdisc_lookup_ops(kind);
886#ifdef CONFIG_MODULES
887 if (ops == NULL && kind != NULL) {
888 char name[IFNAMSIZ];
889 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
890 /* We dropped the RTNL semaphore in order to
891 * perform the module load. So, even if we
892 * succeeded in loading the module we have to
893 * tell the caller to replay the request. We
894 * indicate this using -EAGAIN.
895 * We replay the request because the device may
896 * go away in the mean time.
897 */
898 rtnl_unlock();
899 request_module("sch_%s", name);
900 rtnl_lock();
901 ops = qdisc_lookup_ops(kind);
902 if (ops != NULL) {
903 /* We will try again qdisc_lookup_ops,
904 * so don't keep a reference.
905 */
906 module_put(ops->owner);
907 err = -EAGAIN;
908 goto err_out;
909 }
910 }
911 }
912#endif
913
914 err = -ENOENT;
915 if (ops == NULL)
916 goto err_out;
917
918 sch = qdisc_alloc(dev_queue, ops);
919 if (IS_ERR(sch)) {
920 err = PTR_ERR(sch);
921 goto err_out2;
922 }
923
924 sch->parent = parent;
925
926 if (handle == TC_H_INGRESS) {
927 sch->flags |= TCQ_F_INGRESS;
928 handle = TC_H_MAKE(TC_H_INGRESS, 0);
929 lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
930 } else {
931 if (handle == 0) {
932 handle = qdisc_alloc_handle(dev);
933 err = -ENOMEM;
934 if (handle == 0)
935 goto err_out3;
936 }
937 lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
938 if (!netif_is_multiqueue(dev))
939 sch->flags |= TCQ_F_ONETXQUEUE;
940 }
941
942 sch->handle = handle;
943
944 if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
945 if (tca[TCA_STAB]) {
946 stab = qdisc_get_stab(tca[TCA_STAB]);
947 if (IS_ERR(stab)) {
948 err = PTR_ERR(stab);
949 goto err_out4;
950 }
951 rcu_assign_pointer(sch->stab, stab);
952 }
953 if (tca[TCA_RATE]) {
954 spinlock_t *root_lock;
955
956 err = -EOPNOTSUPP;
957 if (sch->flags & TCQ_F_MQROOT)
958 goto err_out4;
959
960 if ((sch->parent != TC_H_ROOT) &&
961 !(sch->flags & TCQ_F_INGRESS) &&
962 (!p || !(p->flags & TCQ_F_MQROOT)))
963 root_lock = qdisc_root_sleeping_lock(sch);
964 else
965 root_lock = qdisc_lock(sch);
966
967 err = gen_new_estimator(&sch->bstats, &sch->rate_est,
968 root_lock, tca[TCA_RATE]);
969 if (err)
970 goto err_out4;
971 }
972
973 qdisc_list_add(sch);
974
975 return sch;
976 }
977err_out3:
978 dev_put(dev);
979 kfree((char *) sch - sch->padded);
980err_out2:
981 module_put(ops->owner);
982err_out:
983 *errp = err;
984 return NULL;
985
986err_out4:
987 /*
988 * Any broken qdiscs that would require a ops->reset() here?
989 * The qdisc was never in action so it shouldn't be necessary.
990 */
991 qdisc_put_stab(rtnl_dereference(sch->stab));
992 if (ops->destroy)
993 ops->destroy(sch);
994 goto err_out3;
995}
996
997static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
998{
999 struct qdisc_size_table *ostab, *stab = NULL;
1000 int err = 0;
1001
1002 if (tca[TCA_OPTIONS]) {
1003 if (sch->ops->change == NULL)
1004 return -EINVAL;
1005 err = sch->ops->change(sch, tca[TCA_OPTIONS]);
1006 if (err)
1007 return err;
1008 }
1009
1010 if (tca[TCA_STAB]) {
1011 stab = qdisc_get_stab(tca[TCA_STAB]);
1012 if (IS_ERR(stab))
1013 return PTR_ERR(stab);
1014 }
1015
1016 ostab = rtnl_dereference(sch->stab);
1017 rcu_assign_pointer(sch->stab, stab);
1018 qdisc_put_stab(ostab);
1019
1020 if (tca[TCA_RATE]) {
1021 /* NB: ignores errors from replace_estimator
1022 because change can't be undone. */
1023 if (sch->flags & TCQ_F_MQROOT)
1024 goto out;
1025 gen_replace_estimator(&sch->bstats, &sch->rate_est,
1026 qdisc_root_sleeping_lock(sch),
1027 tca[TCA_RATE]);
1028 }
1029out:
1030 return 0;
1031}
1032
1033struct check_loop_arg {
1034 struct qdisc_walker w;
1035 struct Qdisc *p;
1036 int depth;
1037};
1038
1039static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w);
1040
1041static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
1042{
1043 struct check_loop_arg arg;
1044
1045 if (q->ops->cl_ops == NULL)
1046 return 0;
1047
1048 arg.w.stop = arg.w.skip = arg.w.count = 0;
1049 arg.w.fn = check_loop_fn;
1050 arg.depth = depth;
1051 arg.p = p;
1052 q->ops->cl_ops->walk(q, &arg.w);
1053 return arg.w.stop ? -ELOOP : 0;
1054}
1055
1056static int
1057check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
1058{
1059 struct Qdisc *leaf;
1060 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1061 struct check_loop_arg *arg = (struct check_loop_arg *)w;
1062
1063 leaf = cops->leaf(q, cl);
1064 if (leaf) {
1065 if (leaf == arg->p || arg->depth > 7)
1066 return -ELOOP;
1067 return check_loop(leaf, arg->p, arg->depth + 1);
1068 }
1069 return 0;
1070}
1071
1072/*
1073 * Delete/get qdisc.
1074 */
1075
1076static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
1077{
1078 struct net *net = sock_net(skb->sk);
1079 struct tcmsg *tcm = nlmsg_data(n);
1080 struct nlattr *tca[TCA_MAX + 1];
1081 struct net_device *dev;
1082 u32 clid;
1083 struct Qdisc *q = NULL;
1084 struct Qdisc *p = NULL;
1085 int err;
1086
1087 if ((n->nlmsg_type != RTM_GETQDISC) && !netlink_capable(skb, CAP_NET_ADMIN))
1088 return -EPERM;
1089
1090 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1091 if (err < 0)
1092 return err;
1093
1094 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1095 if (!dev)
1096 return -ENODEV;
1097
1098 clid = tcm->tcm_parent;
1099 if (clid) {
1100 if (clid != TC_H_ROOT) {
1101 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
1102 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1103 if (!p)
1104 return -ENOENT;
1105 q = qdisc_leaf(p, clid);
1106 } else if (dev_ingress_queue(dev)) {
1107 q = dev_ingress_queue(dev)->qdisc_sleeping;
1108 }
1109 } else {
1110 q = dev->qdisc;
1111 }
1112 if (!q)
1113 return -ENOENT;
1114
1115 if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
1116 return -EINVAL;
1117 } else {
1118 q = qdisc_lookup(dev, tcm->tcm_handle);
1119 if (!q)
1120 return -ENOENT;
1121 }
1122
1123 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1124 return -EINVAL;
1125
1126 if (n->nlmsg_type == RTM_DELQDISC) {
1127 if (!clid)
1128 return -EINVAL;
1129 if (q->handle == 0)
1130 return -ENOENT;
1131 err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
1132 if (err != 0)
1133 return err;
1134 } else {
1135 qdisc_notify(net, skb, n, clid, NULL, q);
1136 }
1137 return 0;
1138}
1139
1140/*
1141 * Create/change qdisc.
1142 */
1143
1144static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
1145{
1146 struct net *net = sock_net(skb->sk);
1147 struct tcmsg *tcm;
1148 struct nlattr *tca[TCA_MAX + 1];
1149 struct net_device *dev;
1150 u32 clid;
1151 struct Qdisc *q, *p;
1152 int err;
1153
1154 if (!netlink_capable(skb, CAP_NET_ADMIN))
1155 return -EPERM;
1156
1157replay:
1158 /* Reinit, just in case something touches this. */
1159 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1160 if (err < 0)
1161 return err;
1162
1163 tcm = nlmsg_data(n);
1164 clid = tcm->tcm_parent;
1165 q = p = NULL;
1166
1167 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1168 if (!dev)
1169 return -ENODEV;
1170
1171
1172 if (clid) {
1173 if (clid != TC_H_ROOT) {
1174 if (clid != TC_H_INGRESS) {
1175 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1176 if (!p)
1177 return -ENOENT;
1178 q = qdisc_leaf(p, clid);
1179 } else if (dev_ingress_queue_create(dev)) {
1180 q = dev_ingress_queue(dev)->qdisc_sleeping;
1181 }
1182 } else {
1183 q = dev->qdisc;
1184 }
1185
1186 /* It may be default qdisc, ignore it */
1187 if (q && q->handle == 0)
1188 q = NULL;
1189
1190 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1191 if (tcm->tcm_handle) {
1192 if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
1193 return -EEXIST;
1194 if (TC_H_MIN(tcm->tcm_handle))
1195 return -EINVAL;
1196 q = qdisc_lookup(dev, tcm->tcm_handle);
1197 if (!q)
1198 goto create_n_graft;
1199 if (n->nlmsg_flags & NLM_F_EXCL)
1200 return -EEXIST;
1201 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1202 return -EINVAL;
1203 if (q == p ||
1204 (p && check_loop(q, p, 0)))
1205 return -ELOOP;
1206 atomic_inc(&q->refcnt);
1207 goto graft;
1208 } else {
1209 if (!q)
1210 goto create_n_graft;
1211
1212 /* This magic test requires explanation.
1213 *
1214 * We know, that some child q is already
1215 * attached to this parent and have choice:
1216 * either to change it or to create/graft new one.
1217 *
1218 * 1. We are allowed to create/graft only
1219 * if CREATE and REPLACE flags are set.
1220 *
1221 * 2. If EXCL is set, requestor wanted to say,
1222 * that qdisc tcm_handle is not expected
1223 * to exist, so that we choose create/graft too.
1224 *
1225 * 3. The last case is when no flags are set.
1226 * Alas, it is sort of hole in API, we
1227 * cannot decide what to do unambiguously.
1228 * For now we select create/graft, if
1229 * user gave KIND, which does not match existing.
1230 */
1231 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1232 (n->nlmsg_flags & NLM_F_REPLACE) &&
1233 ((n->nlmsg_flags & NLM_F_EXCL) ||
1234 (tca[TCA_KIND] &&
1235 nla_strcmp(tca[TCA_KIND], q->ops->id))))
1236 goto create_n_graft;
1237 }
1238 }
1239 } else {
1240 if (!tcm->tcm_handle)
1241 return -EINVAL;
1242 q = qdisc_lookup(dev, tcm->tcm_handle);
1243 }
1244
1245 /* Change qdisc parameters */
1246 if (q == NULL)
1247 return -ENOENT;
1248 if (n->nlmsg_flags & NLM_F_EXCL)
1249 return -EEXIST;
1250 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1251 return -EINVAL;
1252 err = qdisc_change(q, tca);
1253 if (err == 0)
1254 qdisc_notify(net, skb, n, clid, NULL, q);
1255 return err;
1256
1257create_n_graft:
1258 if (!(n->nlmsg_flags & NLM_F_CREATE))
1259 return -ENOENT;
1260 if (clid == TC_H_INGRESS) {
1261 if (dev_ingress_queue(dev))
1262 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1263 tcm->tcm_parent, tcm->tcm_parent,
1264 tca, &err);
1265 else
1266 err = -ENOENT;
1267 } else {
1268 struct netdev_queue *dev_queue;
1269
1270 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1271 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1272 else if (p)
1273 dev_queue = p->dev_queue;
1274 else
1275 dev_queue = netdev_get_tx_queue(dev, 0);
1276
1277 q = qdisc_create(dev, dev_queue, p,
1278 tcm->tcm_parent, tcm->tcm_handle,
1279 tca, &err);
1280 }
1281 if (q == NULL) {
1282 if (err == -EAGAIN)
1283 goto replay;
1284 return err;
1285 }
1286
1287graft:
1288 err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
1289 if (err) {
1290 if (q)
1291 qdisc_destroy(q);
1292 return err;
1293 }
1294
1295 return 0;
1296}
1297
1298static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
1299 u32 portid, u32 seq, u16 flags, int event)
1300{
1301 struct tcmsg *tcm;
1302 struct nlmsghdr *nlh;
1303 unsigned char *b = skb_tail_pointer(skb);
1304 struct gnet_dump d;
1305 struct qdisc_size_table *stab;
1306
1307 cond_resched();
1308 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1309 if (!nlh)
1310 goto out_nlmsg_trim;
1311 tcm = nlmsg_data(nlh);
1312 tcm->tcm_family = AF_UNSPEC;
1313 tcm->tcm__pad1 = 0;
1314 tcm->tcm__pad2 = 0;
1315 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1316 tcm->tcm_parent = clid;
1317 tcm->tcm_handle = q->handle;
1318 tcm->tcm_info = atomic_read(&q->refcnt);
1319 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1320 goto nla_put_failure;
1321 if (q->ops->dump && q->ops->dump(q, skb) < 0)
1322 goto nla_put_failure;
1323 q->qstats.qlen = q->q.qlen;
1324
1325 stab = rtnl_dereference(q->stab);
1326 if (stab && qdisc_dump_stab(skb, stab) < 0)
1327 goto nla_put_failure;
1328
1329 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1330 qdisc_root_sleeping_lock(q), &d) < 0)
1331 goto nla_put_failure;
1332
1333 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
1334 goto nla_put_failure;
1335
1336 if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
1337 gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
1338 gnet_stats_copy_queue(&d, &q->qstats) < 0)
1339 goto nla_put_failure;
1340
1341 if (gnet_stats_finish_copy(&d) < 0)
1342 goto nla_put_failure;
1343
1344 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1345 return skb->len;
1346
1347out_nlmsg_trim:
1348nla_put_failure:
1349 nlmsg_trim(skb, b);
1350 return -1;
1351}
1352
1353static bool tc_qdisc_dump_ignore(struct Qdisc *q)
1354{
1355 return (q->flags & TCQ_F_BUILTIN) ? true : false;
1356}
1357
1358static int qdisc_notify(struct net *net, struct sk_buff *oskb,
1359 struct nlmsghdr *n, u32 clid,
1360 struct Qdisc *old, struct Qdisc *new)
1361{
1362 struct sk_buff *skb;
1363 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1364
1365 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1366 if (!skb)
1367 return -ENOBUFS;
1368
1369 if (old && !tc_qdisc_dump_ignore(old)) {
1370 if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
1371 0, RTM_DELQDISC) < 0)
1372 goto err_out;
1373 }
1374 if (new && !tc_qdisc_dump_ignore(new)) {
1375 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
1376 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
1377 goto err_out;
1378 }
1379
1380 if (skb->len)
1381 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1382 n->nlmsg_flags & NLM_F_ECHO);
1383
1384err_out:
1385 kfree_skb(skb);
1386 return -EINVAL;
1387}
1388
1389static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1390 struct netlink_callback *cb,
1391 int *q_idx_p, int s_q_idx)
1392{
1393 int ret = 0, q_idx = *q_idx_p;
1394 struct Qdisc *q;
1395
1396 if (!root)
1397 return 0;
1398
1399 q = root;
1400 if (q_idx < s_q_idx) {
1401 q_idx++;
1402 } else {
1403 if (!tc_qdisc_dump_ignore(q) &&
1404 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1405 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1406 goto done;
1407 q_idx++;
1408 }
1409 list_for_each_entry(q, &root->list, list) {
1410 if (q_idx < s_q_idx) {
1411 q_idx++;
1412 continue;
1413 }
1414 if (!tc_qdisc_dump_ignore(q) &&
1415 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1416 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1417 goto done;
1418 q_idx++;
1419 }
1420
1421out:
1422 *q_idx_p = q_idx;
1423 return ret;
1424done:
1425 ret = -1;
1426 goto out;
1427}
1428
1429static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1430{
1431 struct net *net = sock_net(skb->sk);
1432 int idx, q_idx;
1433 int s_idx, s_q_idx;
1434 struct net_device *dev;
1435
1436 s_idx = cb->args[0];
1437 s_q_idx = q_idx = cb->args[1];
1438
1439 idx = 0;
1440 ASSERT_RTNL();
1441 for_each_netdev(net, dev) {
1442 struct netdev_queue *dev_queue;
1443
1444 if (idx < s_idx)
1445 goto cont;
1446 if (idx > s_idx)
1447 s_q_idx = 0;
1448 q_idx = 0;
1449
1450 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0)
1451 goto done;
1452
1453 dev_queue = dev_ingress_queue(dev);
1454 if (dev_queue &&
1455 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1456 &q_idx, s_q_idx) < 0)
1457 goto done;
1458
1459cont:
1460 idx++;
1461 }
1462
1463done:
1464 cb->args[0] = idx;
1465 cb->args[1] = q_idx;
1466
1467 return skb->len;
1468}
1469
1470
1471
1472/************************************************
1473 * Traffic classes manipulation. *
1474 ************************************************/
1475
1476
1477
1478static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n)
1479{
1480 struct net *net = sock_net(skb->sk);
1481 struct tcmsg *tcm = nlmsg_data(n);
1482 struct nlattr *tca[TCA_MAX + 1];
1483 struct net_device *dev;
1484 struct Qdisc *q = NULL;
1485 const struct Qdisc_class_ops *cops;
1486 unsigned long cl = 0;
1487 unsigned long new_cl;
1488 u32 portid;
1489 u32 clid;
1490 u32 qid;
1491 int err;
1492
1493 if ((n->nlmsg_type != RTM_GETTCLASS) && !netlink_capable(skb, CAP_NET_ADMIN))
1494 return -EPERM;
1495
1496 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1497 if (err < 0)
1498 return err;
1499
1500 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1501 if (!dev)
1502 return -ENODEV;
1503
1504 /*
1505 parent == TC_H_UNSPEC - unspecified parent.
1506 parent == TC_H_ROOT - class is root, which has no parent.
1507 parent == X:0 - parent is root class.
1508 parent == X:Y - parent is a node in hierarchy.
1509 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1510
1511 handle == 0:0 - generate handle from kernel pool.
1512 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1513 handle == X:Y - clear.
1514 handle == X:0 - root class.
1515 */
1516
1517 /* Step 1. Determine qdisc handle X:0 */
1518
1519 portid = tcm->tcm_parent;
1520 clid = tcm->tcm_handle;
1521 qid = TC_H_MAJ(clid);
1522
1523 if (portid != TC_H_ROOT) {
1524 u32 qid1 = TC_H_MAJ(portid);
1525
1526 if (qid && qid1) {
1527 /* If both majors are known, they must be identical. */
1528 if (qid != qid1)
1529 return -EINVAL;
1530 } else if (qid1) {
1531 qid = qid1;
1532 } else if (qid == 0)
1533 qid = dev->qdisc->handle;
1534
1535 /* Now qid is genuine qdisc handle consistent
1536 * both with parent and child.
1537 *
1538 * TC_H_MAJ(portid) still may be unspecified, complete it now.
1539 */
1540 if (portid)
1541 portid = TC_H_MAKE(qid, portid);
1542 } else {
1543 if (qid == 0)
1544 qid = dev->qdisc->handle;
1545 }
1546
1547 /* OK. Locate qdisc */
1548 q = qdisc_lookup(dev, qid);
1549 if (!q)
1550 return -ENOENT;
1551
1552 /* An check that it supports classes */
1553 cops = q->ops->cl_ops;
1554 if (cops == NULL)
1555 return -EINVAL;
1556
1557 /* Now try to get class */
1558 if (clid == 0) {
1559 if (portid == TC_H_ROOT)
1560 clid = qid;
1561 } else
1562 clid = TC_H_MAKE(qid, clid);
1563
1564 if (clid)
1565 cl = cops->get(q, clid);
1566
1567 if (cl == 0) {
1568 err = -ENOENT;
1569 if (n->nlmsg_type != RTM_NEWTCLASS ||
1570 !(n->nlmsg_flags & NLM_F_CREATE))
1571 goto out;
1572 } else {
1573 switch (n->nlmsg_type) {
1574 case RTM_NEWTCLASS:
1575 err = -EEXIST;
1576 if (n->nlmsg_flags & NLM_F_EXCL)
1577 goto out;
1578 break;
1579 case RTM_DELTCLASS:
1580 err = -EOPNOTSUPP;
1581 if (cops->delete)
1582 err = cops->delete(q, cl);
1583 if (err == 0)
1584 tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS);
1585 goto out;
1586 case RTM_GETTCLASS:
1587 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
1588 goto out;
1589 default:
1590 err = -EINVAL;
1591 goto out;
1592 }
1593 }
1594
1595 new_cl = cl;
1596 err = -EOPNOTSUPP;
1597 if (cops->change)
1598 err = cops->change(q, clid, portid, tca, &new_cl);
1599 if (err == 0)
1600 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
1601
1602out:
1603 if (cl)
1604 cops->put(q, cl);
1605
1606 return err;
1607}
1608
1609
1610static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1611 unsigned long cl,
1612 u32 portid, u32 seq, u16 flags, int event)
1613{
1614 struct tcmsg *tcm;
1615 struct nlmsghdr *nlh;
1616 unsigned char *b = skb_tail_pointer(skb);
1617 struct gnet_dump d;
1618 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1619
1620 cond_resched();
1621 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1622 if (!nlh)
1623 goto out_nlmsg_trim;
1624 tcm = nlmsg_data(nlh);
1625 tcm->tcm_family = AF_UNSPEC;
1626 tcm->tcm__pad1 = 0;
1627 tcm->tcm__pad2 = 0;
1628 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1629 tcm->tcm_parent = q->handle;
1630 tcm->tcm_handle = q->handle;
1631 tcm->tcm_info = 0;
1632 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1633 goto nla_put_failure;
1634 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1635 goto nla_put_failure;
1636
1637 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1638 qdisc_root_sleeping_lock(q), &d) < 0)
1639 goto nla_put_failure;
1640
1641 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1642 goto nla_put_failure;
1643
1644 if (gnet_stats_finish_copy(&d) < 0)
1645 goto nla_put_failure;
1646
1647 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1648 return skb->len;
1649
1650out_nlmsg_trim:
1651nla_put_failure:
1652 nlmsg_trim(skb, b);
1653 return -1;
1654}
1655
1656static int tclass_notify(struct net *net, struct sk_buff *oskb,
1657 struct nlmsghdr *n, struct Qdisc *q,
1658 unsigned long cl, int event)
1659{
1660 struct sk_buff *skb;
1661 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1662
1663 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1664 if (!skb)
1665 return -ENOBUFS;
1666
1667 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
1668 kfree_skb(skb);
1669 return -EINVAL;
1670 }
1671
1672 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1673 n->nlmsg_flags & NLM_F_ECHO);
1674}
1675
1676struct qdisc_dump_args {
1677 struct qdisc_walker w;
1678 struct sk_buff *skb;
1679 struct netlink_callback *cb;
1680};
1681
1682static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg)
1683{
1684 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
1685
1686 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
1687 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS);
1688}
1689
1690static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
1691 struct tcmsg *tcm, struct netlink_callback *cb,
1692 int *t_p, int s_t)
1693{
1694 struct qdisc_dump_args arg;
1695
1696 if (tc_qdisc_dump_ignore(q) ||
1697 *t_p < s_t || !q->ops->cl_ops ||
1698 (tcm->tcm_parent &&
1699 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
1700 (*t_p)++;
1701 return 0;
1702 }
1703 if (*t_p > s_t)
1704 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
1705 arg.w.fn = qdisc_class_dump;
1706 arg.skb = skb;
1707 arg.cb = cb;
1708 arg.w.stop = 0;
1709 arg.w.skip = cb->args[1];
1710 arg.w.count = 0;
1711 q->ops->cl_ops->walk(q, &arg.w);
1712 cb->args[1] = arg.w.count;
1713 if (arg.w.stop)
1714 return -1;
1715 (*t_p)++;
1716 return 0;
1717}
1718
1719static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
1720 struct tcmsg *tcm, struct netlink_callback *cb,
1721 int *t_p, int s_t)
1722{
1723 struct Qdisc *q;
1724
1725 if (!root)
1726 return 0;
1727
1728 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
1729 return -1;
1730
1731 list_for_each_entry(q, &root->list, list) {
1732 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
1733 return -1;
1734 }
1735
1736 return 0;
1737}
1738
1739static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
1740{
1741 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1742 struct net *net = sock_net(skb->sk);
1743 struct netdev_queue *dev_queue;
1744 struct net_device *dev;
1745 int t, s_t;
1746
1747 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1748 return 0;
1749 dev = dev_get_by_index(net, tcm->tcm_ifindex);
1750 if (!dev)
1751 return 0;
1752
1753 s_t = cb->args[0];
1754 t = 0;
1755
1756 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
1757 goto done;
1758
1759 dev_queue = dev_ingress_queue(dev);
1760 if (dev_queue &&
1761 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
1762 &t, s_t) < 0)
1763 goto done;
1764
1765done:
1766 cb->args[0] = t;
1767
1768 dev_put(dev);
1769 return skb->len;
1770}
1771
1772/* Main classifier routine: scans classifier chain attached
1773 * to this qdisc, (optionally) tests for protocol and asks
1774 * specific classifiers.
1775 */
1776int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
1777 struct tcf_result *res)
1778{
1779 __be16 protocol = skb->protocol;
1780 int err;
1781
1782 for (; tp; tp = tp->next) {
1783 if (tp->protocol != protocol &&
1784 tp->protocol != htons(ETH_P_ALL))
1785 continue;
1786 err = tp->classify(skb, tp, res);
1787
1788 if (err >= 0) {
1789#ifdef CONFIG_NET_CLS_ACT
1790 if (err != TC_ACT_RECLASSIFY && skb->tc_verd)
1791 skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0);
1792#endif
1793 return err;
1794 }
1795 }
1796 return -1;
1797}
1798EXPORT_SYMBOL(tc_classify_compat);
1799
1800int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1801 struct tcf_result *res)
1802{
1803 int err = 0;
1804#ifdef CONFIG_NET_CLS_ACT
1805 const struct tcf_proto *otp = tp;
1806reclassify:
1807#endif
1808
1809 err = tc_classify_compat(skb, tp, res);
1810#ifdef CONFIG_NET_CLS_ACT
1811 if (err == TC_ACT_RECLASSIFY) {
1812 u32 verd = G_TC_VERD(skb->tc_verd);
1813 tp = otp;
1814
1815 if (verd++ >= MAX_REC_LOOP) {
1816 net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n",
1817 tp->q->ops->id,
1818 tp->prio & 0xffff,
1819 ntohs(tp->protocol));
1820 return TC_ACT_SHOT;
1821 }
1822 skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd);
1823 goto reclassify;
1824 }
1825#endif
1826 return err;
1827}
1828EXPORT_SYMBOL(tc_classify);
1829
1830void tcf_destroy(struct tcf_proto *tp)
1831{
1832 tp->ops->destroy(tp);
1833 module_put(tp->ops->owner);
1834 kfree(tp);
1835}
1836
1837void tcf_destroy_chain(struct tcf_proto **fl)
1838{
1839 struct tcf_proto *tp;
1840
1841 while ((tp = *fl) != NULL) {
1842 *fl = tp->next;
1843 tcf_destroy(tp);
1844 }
1845}
1846EXPORT_SYMBOL(tcf_destroy_chain);
1847
1848#ifdef CONFIG_PROC_FS
1849static int psched_show(struct seq_file *seq, void *v)
1850{
1851 struct timespec ts;
1852
1853 hrtimer_get_res(CLOCK_MONOTONIC, &ts);
1854 seq_printf(seq, "%08x %08x %08x %08x\n",
1855 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
1856 1000000,
1857 (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts)));
1858
1859 return 0;
1860}
1861
1862static int psched_open(struct inode *inode, struct file *file)
1863{
1864 return single_open(file, psched_show, NULL);
1865}
1866
1867static const struct file_operations psched_fops = {
1868 .owner = THIS_MODULE,
1869 .open = psched_open,
1870 .read = seq_read,
1871 .llseek = seq_lseek,
1872 .release = single_release,
1873};
1874
1875static int __net_init psched_net_init(struct net *net)
1876{
1877 struct proc_dir_entry *e;
1878
1879 e = proc_create("psched", 0, net->proc_net, &psched_fops);
1880 if (e == NULL)
1881 return -ENOMEM;
1882
1883 return 0;
1884}
1885
1886static void __net_exit psched_net_exit(struct net *net)
1887{
1888 remove_proc_entry("psched", net->proc_net);
1889}
1890#else
1891static int __net_init psched_net_init(struct net *net)
1892{
1893 return 0;
1894}
1895
1896static void __net_exit psched_net_exit(struct net *net)
1897{
1898}
1899#endif
1900
1901static struct pernet_operations psched_net_ops = {
1902 .init = psched_net_init,
1903 .exit = psched_net_exit,
1904};
1905
1906static int __init pktsched_init(void)
1907{
1908 int err;
1909
1910 err = register_pernet_subsys(&psched_net_ops);
1911 if (err) {
1912 pr_err("pktsched_init: "
1913 "cannot initialize per netns operations\n");
1914 return err;
1915 }
1916
1917 register_qdisc(&pfifo_fast_ops);
1918 register_qdisc(&pfifo_qdisc_ops);
1919 register_qdisc(&bfifo_qdisc_ops);
1920 register_qdisc(&pfifo_head_drop_qdisc_ops);
1921 register_qdisc(&mq_qdisc_ops);
1922
1923 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
1924 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
1925 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL);
1926 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
1927 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
1928 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL);
1929
1930 return 0;
1931}
1932
1933subsys_initcall(pktsched_init);