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