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1/*
2 * net/sched/sch_api.c Packet scheduler API.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 * Fixes:
12 *
13 * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired.
14 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
15 * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support
16 */
17
18#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/kernel.h>
21#include <linux/string.h>
22#include <linux/errno.h>
23#include <linux/skbuff.h>
24#include <linux/init.h>
25#include <linux/proc_fs.h>
26#include <linux/seq_file.h>
27#include <linux/kmod.h>
28#include <linux/list.h>
29#include <linux/hrtimer.h>
30#include <linux/lockdep.h>
31#include <linux/slab.h>
32
33#include <net/net_namespace.h>
34#include <net/sock.h>
35#include <net/netlink.h>
36#include <net/pkt_sched.h>
37
38static int qdisc_notify(struct net *net, struct sk_buff *oskb,
39 struct nlmsghdr *n, u32 clid,
40 struct Qdisc *old, struct Qdisc *new);
41static int tclass_notify(struct net *net, struct sk_buff *oskb,
42 struct nlmsghdr *n, struct Qdisc *q,
43 unsigned long cl, int event);
44
45/*
46
47 Short review.
48 -------------
49
50 This file consists of two interrelated parts:
51
52 1. queueing disciplines manager frontend.
53 2. traffic classes manager frontend.
54
55 Generally, queueing discipline ("qdisc") is a black box,
56 which is able to enqueue packets and to dequeue them (when
57 device is ready to send something) in order and at times
58 determined by algorithm hidden in it.
59
60 qdisc's are divided to two categories:
61 - "queues", which have no internal structure visible from outside.
62 - "schedulers", which split all the packets to "traffic classes",
63 using "packet classifiers" (look at cls_api.c)
64
65 In turn, classes may have child qdiscs (as rule, queues)
66 attached to them etc. etc. etc.
67
68 The goal of the routines in this file is to translate
69 information supplied by user in the form of handles
70 to more intelligible for kernel form, to make some sanity
71 checks and part of work, which is common to all qdiscs
72 and to provide rtnetlink notifications.
73
74 All real intelligent work is done inside qdisc modules.
75
76
77
78 Every discipline has two major routines: enqueue and dequeue.
79
80 ---dequeue
81
82 dequeue usually returns a skb to send. It is allowed to return NULL,
83 but it does not mean that queue is empty, it just means that
84 discipline does not want to send anything this time.
85 Queue is really empty if q->q.qlen == 0.
86 For complicated disciplines with multiple queues q->q is not
87 real packet queue, but however q->q.qlen must be valid.
88
89 ---enqueue
90
91 enqueue returns 0, if packet was enqueued successfully.
92 If packet (this one or another one) was dropped, it returns
93 not zero error code.
94 NET_XMIT_DROP - this packet dropped
95 Expected action: do not backoff, but wait until queue will clear.
96 NET_XMIT_CN - probably this packet enqueued, but another one dropped.
97 Expected action: backoff or ignore
98 NET_XMIT_POLICED - dropped by police.
99 Expected action: backoff or error to real-time apps.
100
101 Auxiliary routines:
102
103 ---peek
104
105 like dequeue but without removing a packet from the queue
106
107 ---reset
108
109 returns qdisc to initial state: purge all buffers, clear all
110 timers, counters (except for statistics) etc.
111
112 ---init
113
114 initializes newly created qdisc.
115
116 ---destroy
117
118 destroys resources allocated by init and during lifetime of qdisc.
119
120 ---change
121
122 changes qdisc parameters.
123 */
124
125/* Protects list of registered TC modules. It is pure SMP lock. */
126static DEFINE_RWLOCK(qdisc_mod_lock);
127
128
129/************************************************
130 * Queueing disciplines manipulation. *
131 ************************************************/
132
133
134/* The list of all installed queueing disciplines. */
135
136static struct Qdisc_ops *qdisc_base;
137
138/* Register/uregister queueing discipline */
139
140int register_qdisc(struct Qdisc_ops *qops)
141{
142 struct Qdisc_ops *q, **qp;
143 int rc = -EEXIST;
144
145 write_lock(&qdisc_mod_lock);
146 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
147 if (!strcmp(qops->id, q->id))
148 goto out;
149
150 if (qops->enqueue == NULL)
151 qops->enqueue = noop_qdisc_ops.enqueue;
152 if (qops->peek == NULL) {
153 if (qops->dequeue == NULL)
154 qops->peek = noop_qdisc_ops.peek;
155 else
156 goto out_einval;
157 }
158 if (qops->dequeue == NULL)
159 qops->dequeue = noop_qdisc_ops.dequeue;
160
161 if (qops->cl_ops) {
162 const struct Qdisc_class_ops *cops = qops->cl_ops;
163
164 if (!(cops->get && cops->put && cops->walk && cops->leaf))
165 goto out_einval;
166
167 if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf))
168 goto out_einval;
169 }
170
171 qops->next = NULL;
172 *qp = qops;
173 rc = 0;
174out:
175 write_unlock(&qdisc_mod_lock);
176 return rc;
177
178out_einval:
179 rc = -EINVAL;
180 goto out;
181}
182EXPORT_SYMBOL(register_qdisc);
183
184int unregister_qdisc(struct Qdisc_ops *qops)
185{
186 struct Qdisc_ops *q, **qp;
187 int err = -ENOENT;
188
189 write_lock(&qdisc_mod_lock);
190 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
191 if (q == qops)
192 break;
193 if (q) {
194 *qp = q->next;
195 q->next = NULL;
196 err = 0;
197 }
198 write_unlock(&qdisc_mod_lock);
199 return err;
200}
201EXPORT_SYMBOL(unregister_qdisc);
202
203/* We know handle. Find qdisc among all qdisc's attached to device
204 (root qdisc, all its children, children of children etc.)
205 */
206
207static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
208{
209 struct Qdisc *q;
210
211 if (!(root->flags & TCQ_F_BUILTIN) &&
212 root->handle == handle)
213 return root;
214
215 list_for_each_entry(q, &root->list, list) {
216 if (q->handle == handle)
217 return q;
218 }
219 return NULL;
220}
221
222static void qdisc_list_add(struct Qdisc *q)
223{
224 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
225 list_add_tail(&q->list, &qdisc_dev(q)->qdisc->list);
226}
227
228void qdisc_list_del(struct Qdisc *q)
229{
230 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
231 list_del(&q->list);
232}
233EXPORT_SYMBOL(qdisc_list_del);
234
235struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
236{
237 struct Qdisc *q;
238
239 q = qdisc_match_from_root(dev->qdisc, handle);
240 if (q)
241 goto out;
242
243 if (dev_ingress_queue(dev))
244 q = qdisc_match_from_root(
245 dev_ingress_queue(dev)->qdisc_sleeping,
246 handle);
247out:
248 return q;
249}
250
251static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
252{
253 unsigned long cl;
254 struct Qdisc *leaf;
255 const struct Qdisc_class_ops *cops = p->ops->cl_ops;
256
257 if (cops == NULL)
258 return NULL;
259 cl = cops->get(p, classid);
260
261 if (cl == 0)
262 return NULL;
263 leaf = cops->leaf(p, cl);
264 cops->put(p, cl);
265 return leaf;
266}
267
268/* Find queueing discipline by name */
269
270static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
271{
272 struct Qdisc_ops *q = NULL;
273
274 if (kind) {
275 read_lock(&qdisc_mod_lock);
276 for (q = qdisc_base; q; q = q->next) {
277 if (nla_strcmp(kind, q->id) == 0) {
278 if (!try_module_get(q->owner))
279 q = NULL;
280 break;
281 }
282 }
283 read_unlock(&qdisc_mod_lock);
284 }
285 return q;
286}
287
288static struct qdisc_rate_table *qdisc_rtab_list;
289
290struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab)
291{
292 struct qdisc_rate_table *rtab;
293
294 for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
295 if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) {
296 rtab->refcnt++;
297 return rtab;
298 }
299 }
300
301 if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
302 nla_len(tab) != TC_RTAB_SIZE)
303 return NULL;
304
305 rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
306 if (rtab) {
307 rtab->rate = *r;
308 rtab->refcnt = 1;
309 memcpy(rtab->data, nla_data(tab), 1024);
310 rtab->next = qdisc_rtab_list;
311 qdisc_rtab_list = rtab;
312 }
313 return rtab;
314}
315EXPORT_SYMBOL(qdisc_get_rtab);
316
317void qdisc_put_rtab(struct qdisc_rate_table *tab)
318{
319 struct qdisc_rate_table *rtab, **rtabp;
320
321 if (!tab || --tab->refcnt)
322 return;
323
324 for (rtabp = &qdisc_rtab_list;
325 (rtab = *rtabp) != NULL;
326 rtabp = &rtab->next) {
327 if (rtab == tab) {
328 *rtabp = rtab->next;
329 kfree(rtab);
330 return;
331 }
332 }
333}
334EXPORT_SYMBOL(qdisc_put_rtab);
335
336static LIST_HEAD(qdisc_stab_list);
337static DEFINE_SPINLOCK(qdisc_stab_lock);
338
339static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
340 [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
341 [TCA_STAB_DATA] = { .type = NLA_BINARY },
342};
343
344static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
345{
346 struct nlattr *tb[TCA_STAB_MAX + 1];
347 struct qdisc_size_table *stab;
348 struct tc_sizespec *s;
349 unsigned int tsize = 0;
350 u16 *tab = NULL;
351 int err;
352
353 err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy);
354 if (err < 0)
355 return ERR_PTR(err);
356 if (!tb[TCA_STAB_BASE])
357 return ERR_PTR(-EINVAL);
358
359 s = nla_data(tb[TCA_STAB_BASE]);
360
361 if (s->tsize > 0) {
362 if (!tb[TCA_STAB_DATA])
363 return ERR_PTR(-EINVAL);
364 tab = nla_data(tb[TCA_STAB_DATA]);
365 tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
366 }
367
368 if (tsize != s->tsize || (!tab && tsize > 0))
369 return ERR_PTR(-EINVAL);
370
371 spin_lock(&qdisc_stab_lock);
372
373 list_for_each_entry(stab, &qdisc_stab_list, list) {
374 if (memcmp(&stab->szopts, s, sizeof(*s)))
375 continue;
376 if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
377 continue;
378 stab->refcnt++;
379 spin_unlock(&qdisc_stab_lock);
380 return stab;
381 }
382
383 spin_unlock(&qdisc_stab_lock);
384
385 stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
386 if (!stab)
387 return ERR_PTR(-ENOMEM);
388
389 stab->refcnt = 1;
390 stab->szopts = *s;
391 if (tsize > 0)
392 memcpy(stab->data, tab, tsize * sizeof(u16));
393
394 spin_lock(&qdisc_stab_lock);
395 list_add_tail(&stab->list, &qdisc_stab_list);
396 spin_unlock(&qdisc_stab_lock);
397
398 return stab;
399}
400
401static void stab_kfree_rcu(struct rcu_head *head)
402{
403 kfree(container_of(head, struct qdisc_size_table, rcu));
404}
405
406void qdisc_put_stab(struct qdisc_size_table *tab)
407{
408 if (!tab)
409 return;
410
411 spin_lock(&qdisc_stab_lock);
412
413 if (--tab->refcnt == 0) {
414 list_del(&tab->list);
415 call_rcu_bh(&tab->rcu, stab_kfree_rcu);
416 }
417
418 spin_unlock(&qdisc_stab_lock);
419}
420EXPORT_SYMBOL(qdisc_put_stab);
421
422static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
423{
424 struct nlattr *nest;
425
426 nest = nla_nest_start(skb, TCA_STAB);
427 if (nest == NULL)
428 goto nla_put_failure;
429 NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts);
430 nla_nest_end(skb, nest);
431
432 return skb->len;
433
434nla_put_failure:
435 return -1;
436}
437
438void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab)
439{
440 int pkt_len, slot;
441
442 pkt_len = skb->len + stab->szopts.overhead;
443 if (unlikely(!stab->szopts.tsize))
444 goto out;
445
446 slot = pkt_len + stab->szopts.cell_align;
447 if (unlikely(slot < 0))
448 slot = 0;
449
450 slot >>= stab->szopts.cell_log;
451 if (likely(slot < stab->szopts.tsize))
452 pkt_len = stab->data[slot];
453 else
454 pkt_len = stab->data[stab->szopts.tsize - 1] *
455 (slot / stab->szopts.tsize) +
456 stab->data[slot % stab->szopts.tsize];
457
458 pkt_len <<= stab->szopts.size_log;
459out:
460 if (unlikely(pkt_len < 1))
461 pkt_len = 1;
462 qdisc_skb_cb(skb)->pkt_len = pkt_len;
463}
464EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
465
466void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc)
467{
468 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
469 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
470 txt, qdisc->ops->id, qdisc->handle >> 16);
471 qdisc->flags |= TCQ_F_WARN_NONWC;
472 }
473}
474EXPORT_SYMBOL(qdisc_warn_nonwc);
475
476static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
477{
478 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
479 timer);
480
481 qdisc_unthrottled(wd->qdisc);
482 __netif_schedule(qdisc_root(wd->qdisc));
483
484 return HRTIMER_NORESTART;
485}
486
487void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
488{
489 hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
490 wd->timer.function = qdisc_watchdog;
491 wd->qdisc = qdisc;
492}
493EXPORT_SYMBOL(qdisc_watchdog_init);
494
495void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires)
496{
497 ktime_t time;
498
499 if (test_bit(__QDISC_STATE_DEACTIVATED,
500 &qdisc_root_sleeping(wd->qdisc)->state))
501 return;
502
503 qdisc_throttled(wd->qdisc);
504 time = ktime_set(0, 0);
505 time = ktime_add_ns(time, PSCHED_TICKS2NS(expires));
506 hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS);
507}
508EXPORT_SYMBOL(qdisc_watchdog_schedule);
509
510void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
511{
512 hrtimer_cancel(&wd->timer);
513 qdisc_unthrottled(wd->qdisc);
514}
515EXPORT_SYMBOL(qdisc_watchdog_cancel);
516
517static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
518{
519 unsigned int size = n * sizeof(struct hlist_head), i;
520 struct hlist_head *h;
521
522 if (size <= PAGE_SIZE)
523 h = kmalloc(size, GFP_KERNEL);
524 else
525 h = (struct hlist_head *)
526 __get_free_pages(GFP_KERNEL, get_order(size));
527
528 if (h != NULL) {
529 for (i = 0; i < n; i++)
530 INIT_HLIST_HEAD(&h[i]);
531 }
532 return h;
533}
534
535static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n)
536{
537 unsigned int size = n * sizeof(struct hlist_head);
538
539 if (size <= PAGE_SIZE)
540 kfree(h);
541 else
542 free_pages((unsigned long)h, get_order(size));
543}
544
545void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
546{
547 struct Qdisc_class_common *cl;
548 struct hlist_node *n, *next;
549 struct hlist_head *nhash, *ohash;
550 unsigned int nsize, nmask, osize;
551 unsigned int i, h;
552
553 /* Rehash when load factor exceeds 0.75 */
554 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
555 return;
556 nsize = clhash->hashsize * 2;
557 nmask = nsize - 1;
558 nhash = qdisc_class_hash_alloc(nsize);
559 if (nhash == NULL)
560 return;
561
562 ohash = clhash->hash;
563 osize = clhash->hashsize;
564
565 sch_tree_lock(sch);
566 for (i = 0; i < osize; i++) {
567 hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) {
568 h = qdisc_class_hash(cl->classid, nmask);
569 hlist_add_head(&cl->hnode, &nhash[h]);
570 }
571 }
572 clhash->hash = nhash;
573 clhash->hashsize = nsize;
574 clhash->hashmask = nmask;
575 sch_tree_unlock(sch);
576
577 qdisc_class_hash_free(ohash, osize);
578}
579EXPORT_SYMBOL(qdisc_class_hash_grow);
580
581int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
582{
583 unsigned int size = 4;
584
585 clhash->hash = qdisc_class_hash_alloc(size);
586 if (clhash->hash == NULL)
587 return -ENOMEM;
588 clhash->hashsize = size;
589 clhash->hashmask = size - 1;
590 clhash->hashelems = 0;
591 return 0;
592}
593EXPORT_SYMBOL(qdisc_class_hash_init);
594
595void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
596{
597 qdisc_class_hash_free(clhash->hash, clhash->hashsize);
598}
599EXPORT_SYMBOL(qdisc_class_hash_destroy);
600
601void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
602 struct Qdisc_class_common *cl)
603{
604 unsigned int h;
605
606 INIT_HLIST_NODE(&cl->hnode);
607 h = qdisc_class_hash(cl->classid, clhash->hashmask);
608 hlist_add_head(&cl->hnode, &clhash->hash[h]);
609 clhash->hashelems++;
610}
611EXPORT_SYMBOL(qdisc_class_hash_insert);
612
613void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
614 struct Qdisc_class_common *cl)
615{
616 hlist_del(&cl->hnode);
617 clhash->hashelems--;
618}
619EXPORT_SYMBOL(qdisc_class_hash_remove);
620
621/* Allocate an unique handle from space managed by kernel */
622
623static u32 qdisc_alloc_handle(struct net_device *dev)
624{
625 int i = 0x10000;
626 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
627
628 do {
629 autohandle += TC_H_MAKE(0x10000U, 0);
630 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
631 autohandle = TC_H_MAKE(0x80000000U, 0);
632 } while (qdisc_lookup(dev, autohandle) && --i > 0);
633
634 return i > 0 ? autohandle : 0;
635}
636
637void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
638{
639 const struct Qdisc_class_ops *cops;
640 unsigned long cl;
641 u32 parentid;
642
643 if (n == 0)
644 return;
645 while ((parentid = sch->parent)) {
646 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
647 return;
648
649 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
650 if (sch == NULL) {
651 WARN_ON(parentid != TC_H_ROOT);
652 return;
653 }
654 cops = sch->ops->cl_ops;
655 if (cops->qlen_notify) {
656 cl = cops->get(sch, parentid);
657 cops->qlen_notify(sch, cl);
658 cops->put(sch, cl);
659 }
660 sch->q.qlen -= n;
661 }
662}
663EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
664
665static void notify_and_destroy(struct net *net, struct sk_buff *skb,
666 struct nlmsghdr *n, u32 clid,
667 struct Qdisc *old, struct Qdisc *new)
668{
669 if (new || old)
670 qdisc_notify(net, skb, n, clid, old, new);
671
672 if (old)
673 qdisc_destroy(old);
674}
675
676/* Graft qdisc "new" to class "classid" of qdisc "parent" or
677 * to device "dev".
678 *
679 * When appropriate send a netlink notification using 'skb'
680 * and "n".
681 *
682 * On success, destroy old qdisc.
683 */
684
685static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
686 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
687 struct Qdisc *new, struct Qdisc *old)
688{
689 struct Qdisc *q = old;
690 struct net *net = dev_net(dev);
691 int err = 0;
692
693 if (parent == NULL) {
694 unsigned int i, num_q, ingress;
695
696 ingress = 0;
697 num_q = dev->num_tx_queues;
698 if ((q && q->flags & TCQ_F_INGRESS) ||
699 (new && new->flags & TCQ_F_INGRESS)) {
700 num_q = 1;
701 ingress = 1;
702 if (!dev_ingress_queue(dev))
703 return -ENOENT;
704 }
705
706 if (dev->flags & IFF_UP)
707 dev_deactivate(dev);
708
709 if (new && new->ops->attach) {
710 new->ops->attach(new);
711 num_q = 0;
712 }
713
714 for (i = 0; i < num_q; i++) {
715 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
716
717 if (!ingress)
718 dev_queue = netdev_get_tx_queue(dev, i);
719
720 old = dev_graft_qdisc(dev_queue, new);
721 if (new && i > 0)
722 atomic_inc(&new->refcnt);
723
724 if (!ingress)
725 qdisc_destroy(old);
726 }
727
728 if (!ingress) {
729 notify_and_destroy(net, skb, n, classid,
730 dev->qdisc, new);
731 if (new && !new->ops->attach)
732 atomic_inc(&new->refcnt);
733 dev->qdisc = new ? : &noop_qdisc;
734 } else {
735 notify_and_destroy(net, skb, n, classid, old, new);
736 }
737
738 if (dev->flags & IFF_UP)
739 dev_activate(dev);
740 } else {
741 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
742
743 err = -EOPNOTSUPP;
744 if (cops && cops->graft) {
745 unsigned long cl = cops->get(parent, classid);
746 if (cl) {
747 err = cops->graft(parent, cl, new, &old);
748 cops->put(parent, cl);
749 } else
750 err = -ENOENT;
751 }
752 if (!err)
753 notify_and_destroy(net, skb, n, classid, old, new);
754 }
755 return err;
756}
757
758/* lockdep annotation is needed for ingress; egress gets it only for name */
759static struct lock_class_key qdisc_tx_lock;
760static struct lock_class_key qdisc_rx_lock;
761
762/*
763 Allocate and initialize new qdisc.
764
765 Parameters are passed via opt.
766 */
767
768static struct Qdisc *
769qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
770 struct Qdisc *p, u32 parent, u32 handle,
771 struct nlattr **tca, int *errp)
772{
773 int err;
774 struct nlattr *kind = tca[TCA_KIND];
775 struct Qdisc *sch;
776 struct Qdisc_ops *ops;
777 struct qdisc_size_table *stab;
778
779 ops = qdisc_lookup_ops(kind);
780#ifdef CONFIG_MODULES
781 if (ops == NULL && kind != NULL) {
782 char name[IFNAMSIZ];
783 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
784 /* We dropped the RTNL semaphore in order to
785 * perform the module load. So, even if we
786 * succeeded in loading the module we have to
787 * tell the caller to replay the request. We
788 * indicate this using -EAGAIN.
789 * We replay the request because the device may
790 * go away in the mean time.
791 */
792 rtnl_unlock();
793 request_module("sch_%s", name);
794 rtnl_lock();
795 ops = qdisc_lookup_ops(kind);
796 if (ops != NULL) {
797 /* We will try again qdisc_lookup_ops,
798 * so don't keep a reference.
799 */
800 module_put(ops->owner);
801 err = -EAGAIN;
802 goto err_out;
803 }
804 }
805 }
806#endif
807
808 err = -ENOENT;
809 if (ops == NULL)
810 goto err_out;
811
812 sch = qdisc_alloc(dev_queue, ops);
813 if (IS_ERR(sch)) {
814 err = PTR_ERR(sch);
815 goto err_out2;
816 }
817
818 sch->parent = parent;
819
820 if (handle == TC_H_INGRESS) {
821 sch->flags |= TCQ_F_INGRESS;
822 handle = TC_H_MAKE(TC_H_INGRESS, 0);
823 lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
824 } else {
825 if (handle == 0) {
826 handle = qdisc_alloc_handle(dev);
827 err = -ENOMEM;
828 if (handle == 0)
829 goto err_out3;
830 }
831 lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
832 }
833
834 sch->handle = handle;
835
836 if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
837 if (tca[TCA_STAB]) {
838 stab = qdisc_get_stab(tca[TCA_STAB]);
839 if (IS_ERR(stab)) {
840 err = PTR_ERR(stab);
841 goto err_out4;
842 }
843 rcu_assign_pointer(sch->stab, stab);
844 }
845 if (tca[TCA_RATE]) {
846 spinlock_t *root_lock;
847
848 err = -EOPNOTSUPP;
849 if (sch->flags & TCQ_F_MQROOT)
850 goto err_out4;
851
852 if ((sch->parent != TC_H_ROOT) &&
853 !(sch->flags & TCQ_F_INGRESS) &&
854 (!p || !(p->flags & TCQ_F_MQROOT)))
855 root_lock = qdisc_root_sleeping_lock(sch);
856 else
857 root_lock = qdisc_lock(sch);
858
859 err = gen_new_estimator(&sch->bstats, &sch->rate_est,
860 root_lock, tca[TCA_RATE]);
861 if (err)
862 goto err_out4;
863 }
864
865 qdisc_list_add(sch);
866
867 return sch;
868 }
869err_out3:
870 dev_put(dev);
871 kfree((char *) sch - sch->padded);
872err_out2:
873 module_put(ops->owner);
874err_out:
875 *errp = err;
876 return NULL;
877
878err_out4:
879 /*
880 * Any broken qdiscs that would require a ops->reset() here?
881 * The qdisc was never in action so it shouldn't be necessary.
882 */
883 qdisc_put_stab(rtnl_dereference(sch->stab));
884 if (ops->destroy)
885 ops->destroy(sch);
886 goto err_out3;
887}
888
889static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
890{
891 struct qdisc_size_table *ostab, *stab = NULL;
892 int err = 0;
893
894 if (tca[TCA_OPTIONS]) {
895 if (sch->ops->change == NULL)
896 return -EINVAL;
897 err = sch->ops->change(sch, tca[TCA_OPTIONS]);
898 if (err)
899 return err;
900 }
901
902 if (tca[TCA_STAB]) {
903 stab = qdisc_get_stab(tca[TCA_STAB]);
904 if (IS_ERR(stab))
905 return PTR_ERR(stab);
906 }
907
908 ostab = rtnl_dereference(sch->stab);
909 rcu_assign_pointer(sch->stab, stab);
910 qdisc_put_stab(ostab);
911
912 if (tca[TCA_RATE]) {
913 /* NB: ignores errors from replace_estimator
914 because change can't be undone. */
915 if (sch->flags & TCQ_F_MQROOT)
916 goto out;
917 gen_replace_estimator(&sch->bstats, &sch->rate_est,
918 qdisc_root_sleeping_lock(sch),
919 tca[TCA_RATE]);
920 }
921out:
922 return 0;
923}
924
925struct check_loop_arg {
926 struct qdisc_walker w;
927 struct Qdisc *p;
928 int depth;
929};
930
931static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w);
932
933static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
934{
935 struct check_loop_arg arg;
936
937 if (q->ops->cl_ops == NULL)
938 return 0;
939
940 arg.w.stop = arg.w.skip = arg.w.count = 0;
941 arg.w.fn = check_loop_fn;
942 arg.depth = depth;
943 arg.p = p;
944 q->ops->cl_ops->walk(q, &arg.w);
945 return arg.w.stop ? -ELOOP : 0;
946}
947
948static int
949check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
950{
951 struct Qdisc *leaf;
952 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
953 struct check_loop_arg *arg = (struct check_loop_arg *)w;
954
955 leaf = cops->leaf(q, cl);
956 if (leaf) {
957 if (leaf == arg->p || arg->depth > 7)
958 return -ELOOP;
959 return check_loop(leaf, arg->p, arg->depth + 1);
960 }
961 return 0;
962}
963
964/*
965 * Delete/get qdisc.
966 */
967
968static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
969{
970 struct net *net = sock_net(skb->sk);
971 struct tcmsg *tcm = NLMSG_DATA(n);
972 struct nlattr *tca[TCA_MAX + 1];
973 struct net_device *dev;
974 u32 clid = tcm->tcm_parent;
975 struct Qdisc *q = NULL;
976 struct Qdisc *p = NULL;
977 int err;
978
979 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
980 if (!dev)
981 return -ENODEV;
982
983 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
984 if (err < 0)
985 return err;
986
987 if (clid) {
988 if (clid != TC_H_ROOT) {
989 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
990 p = qdisc_lookup(dev, TC_H_MAJ(clid));
991 if (!p)
992 return -ENOENT;
993 q = qdisc_leaf(p, clid);
994 } else if (dev_ingress_queue(dev)) {
995 q = dev_ingress_queue(dev)->qdisc_sleeping;
996 }
997 } else {
998 q = dev->qdisc;
999 }
1000 if (!q)
1001 return -ENOENT;
1002
1003 if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
1004 return -EINVAL;
1005 } else {
1006 q = qdisc_lookup(dev, tcm->tcm_handle);
1007 if (!q)
1008 return -ENOENT;
1009 }
1010
1011 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1012 return -EINVAL;
1013
1014 if (n->nlmsg_type == RTM_DELQDISC) {
1015 if (!clid)
1016 return -EINVAL;
1017 if (q->handle == 0)
1018 return -ENOENT;
1019 err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
1020 if (err != 0)
1021 return err;
1022 } else {
1023 qdisc_notify(net, skb, n, clid, NULL, q);
1024 }
1025 return 0;
1026}
1027
1028/*
1029 * Create/change qdisc.
1030 */
1031
1032static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
1033{
1034 struct net *net = sock_net(skb->sk);
1035 struct tcmsg *tcm;
1036 struct nlattr *tca[TCA_MAX + 1];
1037 struct net_device *dev;
1038 u32 clid;
1039 struct Qdisc *q, *p;
1040 int err;
1041
1042replay:
1043 /* Reinit, just in case something touches this. */
1044 tcm = NLMSG_DATA(n);
1045 clid = tcm->tcm_parent;
1046 q = p = NULL;
1047
1048 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1049 if (!dev)
1050 return -ENODEV;
1051
1052 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1053 if (err < 0)
1054 return err;
1055
1056 if (clid) {
1057 if (clid != TC_H_ROOT) {
1058 if (clid != TC_H_INGRESS) {
1059 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1060 if (!p)
1061 return -ENOENT;
1062 q = qdisc_leaf(p, clid);
1063 } else if (dev_ingress_queue_create(dev)) {
1064 q = dev_ingress_queue(dev)->qdisc_sleeping;
1065 }
1066 } else {
1067 q = dev->qdisc;
1068 }
1069
1070 /* It may be default qdisc, ignore it */
1071 if (q && q->handle == 0)
1072 q = NULL;
1073
1074 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1075 if (tcm->tcm_handle) {
1076 if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
1077 return -EEXIST;
1078 if (TC_H_MIN(tcm->tcm_handle))
1079 return -EINVAL;
1080 q = qdisc_lookup(dev, tcm->tcm_handle);
1081 if (!q)
1082 goto create_n_graft;
1083 if (n->nlmsg_flags & NLM_F_EXCL)
1084 return -EEXIST;
1085 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1086 return -EINVAL;
1087 if (q == p ||
1088 (p && check_loop(q, p, 0)))
1089 return -ELOOP;
1090 atomic_inc(&q->refcnt);
1091 goto graft;
1092 } else {
1093 if (!q)
1094 goto create_n_graft;
1095
1096 /* This magic test requires explanation.
1097 *
1098 * We know, that some child q is already
1099 * attached to this parent and have choice:
1100 * either to change it or to create/graft new one.
1101 *
1102 * 1. We are allowed to create/graft only
1103 * if CREATE and REPLACE flags are set.
1104 *
1105 * 2. If EXCL is set, requestor wanted to say,
1106 * that qdisc tcm_handle is not expected
1107 * to exist, so that we choose create/graft too.
1108 *
1109 * 3. The last case is when no flags are set.
1110 * Alas, it is sort of hole in API, we
1111 * cannot decide what to do unambiguously.
1112 * For now we select create/graft, if
1113 * user gave KIND, which does not match existing.
1114 */
1115 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1116 (n->nlmsg_flags & NLM_F_REPLACE) &&
1117 ((n->nlmsg_flags & NLM_F_EXCL) ||
1118 (tca[TCA_KIND] &&
1119 nla_strcmp(tca[TCA_KIND], q->ops->id))))
1120 goto create_n_graft;
1121 }
1122 }
1123 } else {
1124 if (!tcm->tcm_handle)
1125 return -EINVAL;
1126 q = qdisc_lookup(dev, tcm->tcm_handle);
1127 }
1128
1129 /* Change qdisc parameters */
1130 if (q == NULL)
1131 return -ENOENT;
1132 if (n->nlmsg_flags & NLM_F_EXCL)
1133 return -EEXIST;
1134 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1135 return -EINVAL;
1136 err = qdisc_change(q, tca);
1137 if (err == 0)
1138 qdisc_notify(net, skb, n, clid, NULL, q);
1139 return err;
1140
1141create_n_graft:
1142 if (!(n->nlmsg_flags & NLM_F_CREATE))
1143 return -ENOENT;
1144 if (clid == TC_H_INGRESS) {
1145 if (dev_ingress_queue(dev))
1146 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1147 tcm->tcm_parent, tcm->tcm_parent,
1148 tca, &err);
1149 else
1150 err = -ENOENT;
1151 } else {
1152 struct netdev_queue *dev_queue;
1153
1154 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1155 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1156 else if (p)
1157 dev_queue = p->dev_queue;
1158 else
1159 dev_queue = netdev_get_tx_queue(dev, 0);
1160
1161 q = qdisc_create(dev, dev_queue, p,
1162 tcm->tcm_parent, tcm->tcm_handle,
1163 tca, &err);
1164 }
1165 if (q == NULL) {
1166 if (err == -EAGAIN)
1167 goto replay;
1168 return err;
1169 }
1170
1171graft:
1172 err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
1173 if (err) {
1174 if (q)
1175 qdisc_destroy(q);
1176 return err;
1177 }
1178
1179 return 0;
1180}
1181
1182static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
1183 u32 pid, u32 seq, u16 flags, int event)
1184{
1185 struct tcmsg *tcm;
1186 struct nlmsghdr *nlh;
1187 unsigned char *b = skb_tail_pointer(skb);
1188 struct gnet_dump d;
1189 struct qdisc_size_table *stab;
1190
1191 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
1192 tcm = NLMSG_DATA(nlh);
1193 tcm->tcm_family = AF_UNSPEC;
1194 tcm->tcm__pad1 = 0;
1195 tcm->tcm__pad2 = 0;
1196 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1197 tcm->tcm_parent = clid;
1198 tcm->tcm_handle = q->handle;
1199 tcm->tcm_info = atomic_read(&q->refcnt);
1200 NLA_PUT_STRING(skb, TCA_KIND, q->ops->id);
1201 if (q->ops->dump && q->ops->dump(q, skb) < 0)
1202 goto nla_put_failure;
1203 q->qstats.qlen = q->q.qlen;
1204
1205 stab = rtnl_dereference(q->stab);
1206 if (stab && qdisc_dump_stab(skb, stab) < 0)
1207 goto nla_put_failure;
1208
1209 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1210 qdisc_root_sleeping_lock(q), &d) < 0)
1211 goto nla_put_failure;
1212
1213 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
1214 goto nla_put_failure;
1215
1216 if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
1217 gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
1218 gnet_stats_copy_queue(&d, &q->qstats) < 0)
1219 goto nla_put_failure;
1220
1221 if (gnet_stats_finish_copy(&d) < 0)
1222 goto nla_put_failure;
1223
1224 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1225 return skb->len;
1226
1227nlmsg_failure:
1228nla_put_failure:
1229 nlmsg_trim(skb, b);
1230 return -1;
1231}
1232
1233static bool tc_qdisc_dump_ignore(struct Qdisc *q)
1234{
1235 return (q->flags & TCQ_F_BUILTIN) ? true : false;
1236}
1237
1238static int qdisc_notify(struct net *net, struct sk_buff *oskb,
1239 struct nlmsghdr *n, u32 clid,
1240 struct Qdisc *old, struct Qdisc *new)
1241{
1242 struct sk_buff *skb;
1243 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
1244
1245 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1246 if (!skb)
1247 return -ENOBUFS;
1248
1249 if (old && !tc_qdisc_dump_ignore(old)) {
1250 if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq,
1251 0, RTM_DELQDISC) < 0)
1252 goto err_out;
1253 }
1254 if (new && !tc_qdisc_dump_ignore(new)) {
1255 if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq,
1256 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
1257 goto err_out;
1258 }
1259
1260 if (skb->len)
1261 return rtnetlink_send(skb, net, pid, RTNLGRP_TC,
1262 n->nlmsg_flags & NLM_F_ECHO);
1263
1264err_out:
1265 kfree_skb(skb);
1266 return -EINVAL;
1267}
1268
1269static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1270 struct netlink_callback *cb,
1271 int *q_idx_p, int s_q_idx)
1272{
1273 int ret = 0, q_idx = *q_idx_p;
1274 struct Qdisc *q;
1275
1276 if (!root)
1277 return 0;
1278
1279 q = root;
1280 if (q_idx < s_q_idx) {
1281 q_idx++;
1282 } else {
1283 if (!tc_qdisc_dump_ignore(q) &&
1284 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid,
1285 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1286 goto done;
1287 q_idx++;
1288 }
1289 list_for_each_entry(q, &root->list, list) {
1290 if (q_idx < s_q_idx) {
1291 q_idx++;
1292 continue;
1293 }
1294 if (!tc_qdisc_dump_ignore(q) &&
1295 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid,
1296 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1297 goto done;
1298 q_idx++;
1299 }
1300
1301out:
1302 *q_idx_p = q_idx;
1303 return ret;
1304done:
1305 ret = -1;
1306 goto out;
1307}
1308
1309static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1310{
1311 struct net *net = sock_net(skb->sk);
1312 int idx, q_idx;
1313 int s_idx, s_q_idx;
1314 struct net_device *dev;
1315
1316 s_idx = cb->args[0];
1317 s_q_idx = q_idx = cb->args[1];
1318
1319 rcu_read_lock();
1320 idx = 0;
1321 for_each_netdev_rcu(net, dev) {
1322 struct netdev_queue *dev_queue;
1323
1324 if (idx < s_idx)
1325 goto cont;
1326 if (idx > s_idx)
1327 s_q_idx = 0;
1328 q_idx = 0;
1329
1330 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0)
1331 goto done;
1332
1333 dev_queue = dev_ingress_queue(dev);
1334 if (dev_queue &&
1335 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1336 &q_idx, s_q_idx) < 0)
1337 goto done;
1338
1339cont:
1340 idx++;
1341 }
1342
1343done:
1344 rcu_read_unlock();
1345
1346 cb->args[0] = idx;
1347 cb->args[1] = q_idx;
1348
1349 return skb->len;
1350}
1351
1352
1353
1354/************************************************
1355 * Traffic classes manipulation. *
1356 ************************************************/
1357
1358
1359
1360static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
1361{
1362 struct net *net = sock_net(skb->sk);
1363 struct tcmsg *tcm = NLMSG_DATA(n);
1364 struct nlattr *tca[TCA_MAX + 1];
1365 struct net_device *dev;
1366 struct Qdisc *q = NULL;
1367 const struct Qdisc_class_ops *cops;
1368 unsigned long cl = 0;
1369 unsigned long new_cl;
1370 u32 pid = tcm->tcm_parent;
1371 u32 clid = tcm->tcm_handle;
1372 u32 qid = TC_H_MAJ(clid);
1373 int err;
1374
1375 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1376 if (!dev)
1377 return -ENODEV;
1378
1379 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1380 if (err < 0)
1381 return err;
1382
1383 /*
1384 parent == TC_H_UNSPEC - unspecified parent.
1385 parent == TC_H_ROOT - class is root, which has no parent.
1386 parent == X:0 - parent is root class.
1387 parent == X:Y - parent is a node in hierarchy.
1388 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1389
1390 handle == 0:0 - generate handle from kernel pool.
1391 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1392 handle == X:Y - clear.
1393 handle == X:0 - root class.
1394 */
1395
1396 /* Step 1. Determine qdisc handle X:0 */
1397
1398 if (pid != TC_H_ROOT) {
1399 u32 qid1 = TC_H_MAJ(pid);
1400
1401 if (qid && qid1) {
1402 /* If both majors are known, they must be identical. */
1403 if (qid != qid1)
1404 return -EINVAL;
1405 } else if (qid1) {
1406 qid = qid1;
1407 } else if (qid == 0)
1408 qid = dev->qdisc->handle;
1409
1410 /* Now qid is genuine qdisc handle consistent
1411 * both with parent and child.
1412 *
1413 * TC_H_MAJ(pid) still may be unspecified, complete it now.
1414 */
1415 if (pid)
1416 pid = TC_H_MAKE(qid, pid);
1417 } else {
1418 if (qid == 0)
1419 qid = dev->qdisc->handle;
1420 }
1421
1422 /* OK. Locate qdisc */
1423 q = qdisc_lookup(dev, qid);
1424 if (!q)
1425 return -ENOENT;
1426
1427 /* An check that it supports classes */
1428 cops = q->ops->cl_ops;
1429 if (cops == NULL)
1430 return -EINVAL;
1431
1432 /* Now try to get class */
1433 if (clid == 0) {
1434 if (pid == TC_H_ROOT)
1435 clid = qid;
1436 } else
1437 clid = TC_H_MAKE(qid, clid);
1438
1439 if (clid)
1440 cl = cops->get(q, clid);
1441
1442 if (cl == 0) {
1443 err = -ENOENT;
1444 if (n->nlmsg_type != RTM_NEWTCLASS ||
1445 !(n->nlmsg_flags & NLM_F_CREATE))
1446 goto out;
1447 } else {
1448 switch (n->nlmsg_type) {
1449 case RTM_NEWTCLASS:
1450 err = -EEXIST;
1451 if (n->nlmsg_flags & NLM_F_EXCL)
1452 goto out;
1453 break;
1454 case RTM_DELTCLASS:
1455 err = -EOPNOTSUPP;
1456 if (cops->delete)
1457 err = cops->delete(q, cl);
1458 if (err == 0)
1459 tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS);
1460 goto out;
1461 case RTM_GETTCLASS:
1462 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
1463 goto out;
1464 default:
1465 err = -EINVAL;
1466 goto out;
1467 }
1468 }
1469
1470 new_cl = cl;
1471 err = -EOPNOTSUPP;
1472 if (cops->change)
1473 err = cops->change(q, clid, pid, tca, &new_cl);
1474 if (err == 0)
1475 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
1476
1477out:
1478 if (cl)
1479 cops->put(q, cl);
1480
1481 return err;
1482}
1483
1484
1485static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1486 unsigned long cl,
1487 u32 pid, u32 seq, u16 flags, int event)
1488{
1489 struct tcmsg *tcm;
1490 struct nlmsghdr *nlh;
1491 unsigned char *b = skb_tail_pointer(skb);
1492 struct gnet_dump d;
1493 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1494
1495 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
1496 tcm = NLMSG_DATA(nlh);
1497 tcm->tcm_family = AF_UNSPEC;
1498 tcm->tcm__pad1 = 0;
1499 tcm->tcm__pad2 = 0;
1500 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1501 tcm->tcm_parent = q->handle;
1502 tcm->tcm_handle = q->handle;
1503 tcm->tcm_info = 0;
1504 NLA_PUT_STRING(skb, TCA_KIND, q->ops->id);
1505 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1506 goto nla_put_failure;
1507
1508 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1509 qdisc_root_sleeping_lock(q), &d) < 0)
1510 goto nla_put_failure;
1511
1512 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1513 goto nla_put_failure;
1514
1515 if (gnet_stats_finish_copy(&d) < 0)
1516 goto nla_put_failure;
1517
1518 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1519 return skb->len;
1520
1521nlmsg_failure:
1522nla_put_failure:
1523 nlmsg_trim(skb, b);
1524 return -1;
1525}
1526
1527static int tclass_notify(struct net *net, struct sk_buff *oskb,
1528 struct nlmsghdr *n, struct Qdisc *q,
1529 unsigned long cl, int event)
1530{
1531 struct sk_buff *skb;
1532 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
1533
1534 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1535 if (!skb)
1536 return -ENOBUFS;
1537
1538 if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) {
1539 kfree_skb(skb);
1540 return -EINVAL;
1541 }
1542
1543 return rtnetlink_send(skb, net, pid, RTNLGRP_TC,
1544 n->nlmsg_flags & NLM_F_ECHO);
1545}
1546
1547struct qdisc_dump_args {
1548 struct qdisc_walker w;
1549 struct sk_buff *skb;
1550 struct netlink_callback *cb;
1551};
1552
1553static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg)
1554{
1555 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
1556
1557 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid,
1558 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS);
1559}
1560
1561static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
1562 struct tcmsg *tcm, struct netlink_callback *cb,
1563 int *t_p, int s_t)
1564{
1565 struct qdisc_dump_args arg;
1566
1567 if (tc_qdisc_dump_ignore(q) ||
1568 *t_p < s_t || !q->ops->cl_ops ||
1569 (tcm->tcm_parent &&
1570 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
1571 (*t_p)++;
1572 return 0;
1573 }
1574 if (*t_p > s_t)
1575 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
1576 arg.w.fn = qdisc_class_dump;
1577 arg.skb = skb;
1578 arg.cb = cb;
1579 arg.w.stop = 0;
1580 arg.w.skip = cb->args[1];
1581 arg.w.count = 0;
1582 q->ops->cl_ops->walk(q, &arg.w);
1583 cb->args[1] = arg.w.count;
1584 if (arg.w.stop)
1585 return -1;
1586 (*t_p)++;
1587 return 0;
1588}
1589
1590static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
1591 struct tcmsg *tcm, struct netlink_callback *cb,
1592 int *t_p, int s_t)
1593{
1594 struct Qdisc *q;
1595
1596 if (!root)
1597 return 0;
1598
1599 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
1600 return -1;
1601
1602 list_for_each_entry(q, &root->list, list) {
1603 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
1604 return -1;
1605 }
1606
1607 return 0;
1608}
1609
1610static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
1611{
1612 struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh);
1613 struct net *net = sock_net(skb->sk);
1614 struct netdev_queue *dev_queue;
1615 struct net_device *dev;
1616 int t, s_t;
1617
1618 if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
1619 return 0;
1620 dev = dev_get_by_index(net, tcm->tcm_ifindex);
1621 if (!dev)
1622 return 0;
1623
1624 s_t = cb->args[0];
1625 t = 0;
1626
1627 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
1628 goto done;
1629
1630 dev_queue = dev_ingress_queue(dev);
1631 if (dev_queue &&
1632 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
1633 &t, s_t) < 0)
1634 goto done;
1635
1636done:
1637 cb->args[0] = t;
1638
1639 dev_put(dev);
1640 return skb->len;
1641}
1642
1643/* Main classifier routine: scans classifier chain attached
1644 * to this qdisc, (optionally) tests for protocol and asks
1645 * specific classifiers.
1646 */
1647int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
1648 struct tcf_result *res)
1649{
1650 __be16 protocol = skb->protocol;
1651 int err;
1652
1653 for (; tp; tp = tp->next) {
1654 if (tp->protocol != protocol &&
1655 tp->protocol != htons(ETH_P_ALL))
1656 continue;
1657 err = tp->classify(skb, tp, res);
1658
1659 if (err >= 0) {
1660#ifdef CONFIG_NET_CLS_ACT
1661 if (err != TC_ACT_RECLASSIFY && skb->tc_verd)
1662 skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0);
1663#endif
1664 return err;
1665 }
1666 }
1667 return -1;
1668}
1669EXPORT_SYMBOL(tc_classify_compat);
1670
1671int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1672 struct tcf_result *res)
1673{
1674 int err = 0;
1675#ifdef CONFIG_NET_CLS_ACT
1676 const struct tcf_proto *otp = tp;
1677reclassify:
1678#endif
1679
1680 err = tc_classify_compat(skb, tp, res);
1681#ifdef CONFIG_NET_CLS_ACT
1682 if (err == TC_ACT_RECLASSIFY) {
1683 u32 verd = G_TC_VERD(skb->tc_verd);
1684 tp = otp;
1685
1686 if (verd++ >= MAX_REC_LOOP) {
1687 if (net_ratelimit())
1688 pr_notice("%s: packet reclassify loop"
1689 " rule prio %u protocol %02x\n",
1690 tp->q->ops->id,
1691 tp->prio & 0xffff,
1692 ntohs(tp->protocol));
1693 return TC_ACT_SHOT;
1694 }
1695 skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd);
1696 goto reclassify;
1697 }
1698#endif
1699 return err;
1700}
1701EXPORT_SYMBOL(tc_classify);
1702
1703void tcf_destroy(struct tcf_proto *tp)
1704{
1705 tp->ops->destroy(tp);
1706 module_put(tp->ops->owner);
1707 kfree(tp);
1708}
1709
1710void tcf_destroy_chain(struct tcf_proto **fl)
1711{
1712 struct tcf_proto *tp;
1713
1714 while ((tp = *fl) != NULL) {
1715 *fl = tp->next;
1716 tcf_destroy(tp);
1717 }
1718}
1719EXPORT_SYMBOL(tcf_destroy_chain);
1720
1721#ifdef CONFIG_PROC_FS
1722static int psched_show(struct seq_file *seq, void *v)
1723{
1724 struct timespec ts;
1725
1726 hrtimer_get_res(CLOCK_MONOTONIC, &ts);
1727 seq_printf(seq, "%08x %08x %08x %08x\n",
1728 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
1729 1000000,
1730 (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts)));
1731
1732 return 0;
1733}
1734
1735static int psched_open(struct inode *inode, struct file *file)
1736{
1737 return single_open(file, psched_show, NULL);
1738}
1739
1740static const struct file_operations psched_fops = {
1741 .owner = THIS_MODULE,
1742 .open = psched_open,
1743 .read = seq_read,
1744 .llseek = seq_lseek,
1745 .release = single_release,
1746};
1747
1748static int __net_init psched_net_init(struct net *net)
1749{
1750 struct proc_dir_entry *e;
1751
1752 e = proc_net_fops_create(net, "psched", 0, &psched_fops);
1753 if (e == NULL)
1754 return -ENOMEM;
1755
1756 return 0;
1757}
1758
1759static void __net_exit psched_net_exit(struct net *net)
1760{
1761 proc_net_remove(net, "psched");
1762}
1763#else
1764static int __net_init psched_net_init(struct net *net)
1765{
1766 return 0;
1767}
1768
1769static void __net_exit psched_net_exit(struct net *net)
1770{
1771}
1772#endif
1773
1774static struct pernet_operations psched_net_ops = {
1775 .init = psched_net_init,
1776 .exit = psched_net_exit,
1777};
1778
1779static int __init pktsched_init(void)
1780{
1781 int err;
1782
1783 err = register_pernet_subsys(&psched_net_ops);
1784 if (err) {
1785 pr_err("pktsched_init: "
1786 "cannot initialize per netns operations\n");
1787 return err;
1788 }
1789
1790 register_qdisc(&pfifo_qdisc_ops);
1791 register_qdisc(&bfifo_qdisc_ops);
1792 register_qdisc(&pfifo_head_drop_qdisc_ops);
1793 register_qdisc(&mq_qdisc_ops);
1794
1795 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
1796 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
1797 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL);
1798 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
1799 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
1800 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL);
1801
1802 return 0;
1803}
1804
1805subsys_initcall(pktsched_init);
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#include <net/tc_wrapper.h>
35
36#include <trace/events/qdisc.h>
37
38/*
39
40 Short review.
41 -------------
42
43 This file consists of two interrelated parts:
44
45 1. queueing disciplines manager frontend.
46 2. traffic classes manager frontend.
47
48 Generally, queueing discipline ("qdisc") is a black box,
49 which is able to enqueue packets and to dequeue them (when
50 device is ready to send something) in order and at times
51 determined by algorithm hidden in it.
52
53 qdisc's are divided to two categories:
54 - "queues", which have no internal structure visible from outside.
55 - "schedulers", which split all the packets to "traffic classes",
56 using "packet classifiers" (look at cls_api.c)
57
58 In turn, classes may have child qdiscs (as rule, queues)
59 attached to them etc. etc. etc.
60
61 The goal of the routines in this file is to translate
62 information supplied by user in the form of handles
63 to more intelligible for kernel form, to make some sanity
64 checks and part of work, which is common to all qdiscs
65 and to provide rtnetlink notifications.
66
67 All real intelligent work is done inside qdisc modules.
68
69
70
71 Every discipline has two major routines: enqueue and dequeue.
72
73 ---dequeue
74
75 dequeue usually returns a skb to send. It is allowed to return NULL,
76 but it does not mean that queue is empty, it just means that
77 discipline does not want to send anything this time.
78 Queue is really empty if q->q.qlen == 0.
79 For complicated disciplines with multiple queues q->q is not
80 real packet queue, but however q->q.qlen must be valid.
81
82 ---enqueue
83
84 enqueue returns 0, if packet was enqueued successfully.
85 If packet (this one or another one) was dropped, it returns
86 not zero error code.
87 NET_XMIT_DROP - this packet dropped
88 Expected action: do not backoff, but wait until queue will clear.
89 NET_XMIT_CN - probably this packet enqueued, but another one dropped.
90 Expected action: backoff or ignore
91
92 Auxiliary routines:
93
94 ---peek
95
96 like dequeue but without removing a packet from the queue
97
98 ---reset
99
100 returns qdisc to initial state: purge all buffers, clear all
101 timers, counters (except for statistics) etc.
102
103 ---init
104
105 initializes newly created qdisc.
106
107 ---destroy
108
109 destroys resources allocated by init and during lifetime of qdisc.
110
111 ---change
112
113 changes qdisc parameters.
114 */
115
116/* Protects list of registered TC modules. It is pure SMP lock. */
117static DEFINE_RWLOCK(qdisc_mod_lock);
118
119
120/************************************************
121 * Queueing disciplines manipulation. *
122 ************************************************/
123
124
125/* The list of all installed queueing disciplines. */
126
127static struct Qdisc_ops *qdisc_base;
128
129/* Register/unregister queueing discipline */
130
131int register_qdisc(struct Qdisc_ops *qops)
132{
133 struct Qdisc_ops *q, **qp;
134 int rc = -EEXIST;
135
136 write_lock(&qdisc_mod_lock);
137 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
138 if (!strcmp(qops->id, q->id))
139 goto out;
140
141 if (qops->enqueue == NULL)
142 qops->enqueue = noop_qdisc_ops.enqueue;
143 if (qops->peek == NULL) {
144 if (qops->dequeue == NULL)
145 qops->peek = noop_qdisc_ops.peek;
146 else
147 goto out_einval;
148 }
149 if (qops->dequeue == NULL)
150 qops->dequeue = noop_qdisc_ops.dequeue;
151
152 if (qops->cl_ops) {
153 const struct Qdisc_class_ops *cops = qops->cl_ops;
154
155 if (!(cops->find && cops->walk && cops->leaf))
156 goto out_einval;
157
158 if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf))
159 goto out_einval;
160 }
161
162 qops->next = NULL;
163 *qp = qops;
164 rc = 0;
165out:
166 write_unlock(&qdisc_mod_lock);
167 return rc;
168
169out_einval:
170 rc = -EINVAL;
171 goto out;
172}
173EXPORT_SYMBOL(register_qdisc);
174
175void unregister_qdisc(struct Qdisc_ops *qops)
176{
177 struct Qdisc_ops *q, **qp;
178 int err = -ENOENT;
179
180 write_lock(&qdisc_mod_lock);
181 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
182 if (q == qops)
183 break;
184 if (q) {
185 *qp = q->next;
186 q->next = NULL;
187 err = 0;
188 }
189 write_unlock(&qdisc_mod_lock);
190
191 WARN(err, "unregister qdisc(%s) failed\n", qops->id);
192}
193EXPORT_SYMBOL(unregister_qdisc);
194
195/* Get default qdisc if not otherwise specified */
196void qdisc_get_default(char *name, size_t len)
197{
198 read_lock(&qdisc_mod_lock);
199 strscpy(name, default_qdisc_ops->id, len);
200 read_unlock(&qdisc_mod_lock);
201}
202
203static struct Qdisc_ops *qdisc_lookup_default(const char *name)
204{
205 struct Qdisc_ops *q = NULL;
206
207 for (q = qdisc_base; q; q = q->next) {
208 if (!strcmp(name, q->id)) {
209 if (!try_module_get(q->owner))
210 q = NULL;
211 break;
212 }
213 }
214
215 return q;
216}
217
218/* Set new default qdisc to use */
219int qdisc_set_default(const char *name)
220{
221 const struct Qdisc_ops *ops;
222
223 if (!capable(CAP_NET_ADMIN))
224 return -EPERM;
225
226 write_lock(&qdisc_mod_lock);
227 ops = qdisc_lookup_default(name);
228 if (!ops) {
229 /* Not found, drop lock and try to load module */
230 write_unlock(&qdisc_mod_lock);
231 request_module("sch_%s", name);
232 write_lock(&qdisc_mod_lock);
233
234 ops = qdisc_lookup_default(name);
235 }
236
237 if (ops) {
238 /* Set new default */
239 module_put(default_qdisc_ops->owner);
240 default_qdisc_ops = ops;
241 }
242 write_unlock(&qdisc_mod_lock);
243
244 return ops ? 0 : -ENOENT;
245}
246
247#ifdef CONFIG_NET_SCH_DEFAULT
248/* Set default value from kernel config */
249static int __init sch_default_qdisc(void)
250{
251 return qdisc_set_default(CONFIG_DEFAULT_NET_SCH);
252}
253late_initcall(sch_default_qdisc);
254#endif
255
256/* We know handle. Find qdisc among all qdisc's attached to device
257 * (root qdisc, all its children, children of children etc.)
258 * Note: caller either uses rtnl or rcu_read_lock()
259 */
260
261static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
262{
263 struct Qdisc *q;
264
265 if (!qdisc_dev(root))
266 return (root->handle == handle ? root : NULL);
267
268 if (!(root->flags & TCQ_F_BUILTIN) &&
269 root->handle == handle)
270 return root;
271
272 hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle,
273 lockdep_rtnl_is_held()) {
274 if (q->handle == handle)
275 return q;
276 }
277 return NULL;
278}
279
280void qdisc_hash_add(struct Qdisc *q, bool invisible)
281{
282 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
283 ASSERT_RTNL();
284 hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle);
285 if (invisible)
286 q->flags |= TCQ_F_INVISIBLE;
287 }
288}
289EXPORT_SYMBOL(qdisc_hash_add);
290
291void qdisc_hash_del(struct Qdisc *q)
292{
293 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
294 ASSERT_RTNL();
295 hash_del_rcu(&q->hash);
296 }
297}
298EXPORT_SYMBOL(qdisc_hash_del);
299
300struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
301{
302 struct Qdisc *q;
303
304 if (!handle)
305 return NULL;
306 q = qdisc_match_from_root(rtnl_dereference(dev->qdisc), handle);
307 if (q)
308 goto out;
309
310 if (dev_ingress_queue(dev))
311 q = qdisc_match_from_root(
312 rtnl_dereference(dev_ingress_queue(dev)->qdisc_sleeping),
313 handle);
314out:
315 return q;
316}
317
318struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle)
319{
320 struct netdev_queue *nq;
321 struct Qdisc *q;
322
323 if (!handle)
324 return NULL;
325 q = qdisc_match_from_root(rcu_dereference(dev->qdisc), handle);
326 if (q)
327 goto out;
328
329 nq = dev_ingress_queue_rcu(dev);
330 if (nq)
331 q = qdisc_match_from_root(rcu_dereference(nq->qdisc_sleeping),
332 handle);
333out:
334 return q;
335}
336
337static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
338{
339 unsigned long cl;
340 const struct Qdisc_class_ops *cops = p->ops->cl_ops;
341
342 if (cops == NULL)
343 return NULL;
344 cl = cops->find(p, classid);
345
346 if (cl == 0)
347 return NULL;
348 return cops->leaf(p, cl);
349}
350
351/* Find queueing discipline by name */
352
353static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
354{
355 struct Qdisc_ops *q = NULL;
356
357 if (kind) {
358 read_lock(&qdisc_mod_lock);
359 for (q = qdisc_base; q; q = q->next) {
360 if (nla_strcmp(kind, q->id) == 0) {
361 if (!try_module_get(q->owner))
362 q = NULL;
363 break;
364 }
365 }
366 read_unlock(&qdisc_mod_lock);
367 }
368 return q;
369}
370
371/* The linklayer setting were not transferred from iproute2, in older
372 * versions, and the rate tables lookup systems have been dropped in
373 * the kernel. To keep backward compatible with older iproute2 tc
374 * utils, we detect the linklayer setting by detecting if the rate
375 * table were modified.
376 *
377 * For linklayer ATM table entries, the rate table will be aligned to
378 * 48 bytes, thus some table entries will contain the same value. The
379 * mpu (min packet unit) is also encoded into the old rate table, thus
380 * starting from the mpu, we find low and high table entries for
381 * mapping this cell. If these entries contain the same value, when
382 * the rate tables have been modified for linklayer ATM.
383 *
384 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
385 * and then roundup to the next cell, calc the table entry one below,
386 * and compare.
387 */
388static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
389{
390 int low = roundup(r->mpu, 48);
391 int high = roundup(low+1, 48);
392 int cell_low = low >> r->cell_log;
393 int cell_high = (high >> r->cell_log) - 1;
394
395 /* rtab is too inaccurate at rates > 100Mbit/s */
396 if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
397 pr_debug("TC linklayer: Giving up ATM detection\n");
398 return TC_LINKLAYER_ETHERNET;
399 }
400
401 if ((cell_high > cell_low) && (cell_high < 256)
402 && (rtab[cell_low] == rtab[cell_high])) {
403 pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
404 cell_low, cell_high, rtab[cell_high]);
405 return TC_LINKLAYER_ATM;
406 }
407 return TC_LINKLAYER_ETHERNET;
408}
409
410static struct qdisc_rate_table *qdisc_rtab_list;
411
412struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
413 struct nlattr *tab,
414 struct netlink_ext_ack *extack)
415{
416 struct qdisc_rate_table *rtab;
417
418 if (tab == NULL || r->rate == 0 ||
419 r->cell_log == 0 || r->cell_log >= 32 ||
420 nla_len(tab) != TC_RTAB_SIZE) {
421 NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching");
422 return NULL;
423 }
424
425 for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
426 if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) &&
427 !memcmp(&rtab->data, nla_data(tab), 1024)) {
428 rtab->refcnt++;
429 return rtab;
430 }
431 }
432
433 rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
434 if (rtab) {
435 rtab->rate = *r;
436 rtab->refcnt = 1;
437 memcpy(rtab->data, nla_data(tab), 1024);
438 if (r->linklayer == TC_LINKLAYER_UNAWARE)
439 r->linklayer = __detect_linklayer(r, rtab->data);
440 rtab->next = qdisc_rtab_list;
441 qdisc_rtab_list = rtab;
442 } else {
443 NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table");
444 }
445 return rtab;
446}
447EXPORT_SYMBOL(qdisc_get_rtab);
448
449void qdisc_put_rtab(struct qdisc_rate_table *tab)
450{
451 struct qdisc_rate_table *rtab, **rtabp;
452
453 if (!tab || --tab->refcnt)
454 return;
455
456 for (rtabp = &qdisc_rtab_list;
457 (rtab = *rtabp) != NULL;
458 rtabp = &rtab->next) {
459 if (rtab == tab) {
460 *rtabp = rtab->next;
461 kfree(rtab);
462 return;
463 }
464 }
465}
466EXPORT_SYMBOL(qdisc_put_rtab);
467
468static LIST_HEAD(qdisc_stab_list);
469
470static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
471 [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
472 [TCA_STAB_DATA] = { .type = NLA_BINARY },
473};
474
475static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt,
476 struct netlink_ext_ack *extack)
477{
478 struct nlattr *tb[TCA_STAB_MAX + 1];
479 struct qdisc_size_table *stab;
480 struct tc_sizespec *s;
481 unsigned int tsize = 0;
482 u16 *tab = NULL;
483 int err;
484
485 err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy,
486 extack);
487 if (err < 0)
488 return ERR_PTR(err);
489 if (!tb[TCA_STAB_BASE]) {
490 NL_SET_ERR_MSG(extack, "Size table base attribute is missing");
491 return ERR_PTR(-EINVAL);
492 }
493
494 s = nla_data(tb[TCA_STAB_BASE]);
495
496 if (s->tsize > 0) {
497 if (!tb[TCA_STAB_DATA]) {
498 NL_SET_ERR_MSG(extack, "Size table data attribute is missing");
499 return ERR_PTR(-EINVAL);
500 }
501 tab = nla_data(tb[TCA_STAB_DATA]);
502 tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
503 }
504
505 if (tsize != s->tsize || (!tab && tsize > 0)) {
506 NL_SET_ERR_MSG(extack, "Invalid size of size table");
507 return ERR_PTR(-EINVAL);
508 }
509
510 list_for_each_entry(stab, &qdisc_stab_list, list) {
511 if (memcmp(&stab->szopts, s, sizeof(*s)))
512 continue;
513 if (tsize > 0 &&
514 memcmp(stab->data, tab, flex_array_size(stab, data, tsize)))
515 continue;
516 stab->refcnt++;
517 return stab;
518 }
519
520 if (s->size_log > STAB_SIZE_LOG_MAX ||
521 s->cell_log > STAB_SIZE_LOG_MAX) {
522 NL_SET_ERR_MSG(extack, "Invalid logarithmic size of size table");
523 return ERR_PTR(-EINVAL);
524 }
525
526 stab = kmalloc(struct_size(stab, data, tsize), GFP_KERNEL);
527 if (!stab)
528 return ERR_PTR(-ENOMEM);
529
530 stab->refcnt = 1;
531 stab->szopts = *s;
532 if (tsize > 0)
533 memcpy(stab->data, tab, flex_array_size(stab, data, tsize));
534
535 list_add_tail(&stab->list, &qdisc_stab_list);
536
537 return stab;
538}
539
540void qdisc_put_stab(struct qdisc_size_table *tab)
541{
542 if (!tab)
543 return;
544
545 if (--tab->refcnt == 0) {
546 list_del(&tab->list);
547 kfree_rcu(tab, rcu);
548 }
549}
550EXPORT_SYMBOL(qdisc_put_stab);
551
552static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
553{
554 struct nlattr *nest;
555
556 nest = nla_nest_start_noflag(skb, TCA_STAB);
557 if (nest == NULL)
558 goto nla_put_failure;
559 if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
560 goto nla_put_failure;
561 nla_nest_end(skb, nest);
562
563 return skb->len;
564
565nla_put_failure:
566 return -1;
567}
568
569void __qdisc_calculate_pkt_len(struct sk_buff *skb,
570 const struct qdisc_size_table *stab)
571{
572 int pkt_len, slot;
573
574 pkt_len = skb->len + stab->szopts.overhead;
575 if (unlikely(!stab->szopts.tsize))
576 goto out;
577
578 slot = pkt_len + stab->szopts.cell_align;
579 if (unlikely(slot < 0))
580 slot = 0;
581
582 slot >>= stab->szopts.cell_log;
583 if (likely(slot < stab->szopts.tsize))
584 pkt_len = stab->data[slot];
585 else
586 pkt_len = stab->data[stab->szopts.tsize - 1] *
587 (slot / stab->szopts.tsize) +
588 stab->data[slot % stab->szopts.tsize];
589
590 pkt_len <<= stab->szopts.size_log;
591out:
592 if (unlikely(pkt_len < 1))
593 pkt_len = 1;
594 qdisc_skb_cb(skb)->pkt_len = pkt_len;
595}
596EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
597
598void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc)
599{
600 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
601 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
602 txt, qdisc->ops->id, qdisc->handle >> 16);
603 qdisc->flags |= TCQ_F_WARN_NONWC;
604 }
605}
606EXPORT_SYMBOL(qdisc_warn_nonwc);
607
608static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
609{
610 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
611 timer);
612
613 rcu_read_lock();
614 __netif_schedule(qdisc_root(wd->qdisc));
615 rcu_read_unlock();
616
617 return HRTIMER_NORESTART;
618}
619
620void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
621 clockid_t clockid)
622{
623 hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED);
624 wd->timer.function = qdisc_watchdog;
625 wd->qdisc = qdisc;
626}
627EXPORT_SYMBOL(qdisc_watchdog_init_clockid);
628
629void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
630{
631 qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC);
632}
633EXPORT_SYMBOL(qdisc_watchdog_init);
634
635void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
636 u64 delta_ns)
637{
638 bool deactivated;
639
640 rcu_read_lock();
641 deactivated = test_bit(__QDISC_STATE_DEACTIVATED,
642 &qdisc_root_sleeping(wd->qdisc)->state);
643 rcu_read_unlock();
644 if (deactivated)
645 return;
646
647 if (hrtimer_is_queued(&wd->timer)) {
648 u64 softexpires;
649
650 softexpires = ktime_to_ns(hrtimer_get_softexpires(&wd->timer));
651 /* If timer is already set in [expires, expires + delta_ns],
652 * do not reprogram it.
653 */
654 if (softexpires - expires <= delta_ns)
655 return;
656 }
657
658 hrtimer_start_range_ns(&wd->timer,
659 ns_to_ktime(expires),
660 delta_ns,
661 HRTIMER_MODE_ABS_PINNED);
662}
663EXPORT_SYMBOL(qdisc_watchdog_schedule_range_ns);
664
665void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
666{
667 hrtimer_cancel(&wd->timer);
668}
669EXPORT_SYMBOL(qdisc_watchdog_cancel);
670
671static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
672{
673 struct hlist_head *h;
674 unsigned int i;
675
676 h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL);
677
678 if (h != NULL) {
679 for (i = 0; i < n; i++)
680 INIT_HLIST_HEAD(&h[i]);
681 }
682 return h;
683}
684
685void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
686{
687 struct Qdisc_class_common *cl;
688 struct hlist_node *next;
689 struct hlist_head *nhash, *ohash;
690 unsigned int nsize, nmask, osize;
691 unsigned int i, h;
692
693 /* Rehash when load factor exceeds 0.75 */
694 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
695 return;
696 nsize = clhash->hashsize * 2;
697 nmask = nsize - 1;
698 nhash = qdisc_class_hash_alloc(nsize);
699 if (nhash == NULL)
700 return;
701
702 ohash = clhash->hash;
703 osize = clhash->hashsize;
704
705 sch_tree_lock(sch);
706 for (i = 0; i < osize; i++) {
707 hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
708 h = qdisc_class_hash(cl->classid, nmask);
709 hlist_add_head(&cl->hnode, &nhash[h]);
710 }
711 }
712 clhash->hash = nhash;
713 clhash->hashsize = nsize;
714 clhash->hashmask = nmask;
715 sch_tree_unlock(sch);
716
717 kvfree(ohash);
718}
719EXPORT_SYMBOL(qdisc_class_hash_grow);
720
721int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
722{
723 unsigned int size = 4;
724
725 clhash->hash = qdisc_class_hash_alloc(size);
726 if (!clhash->hash)
727 return -ENOMEM;
728 clhash->hashsize = size;
729 clhash->hashmask = size - 1;
730 clhash->hashelems = 0;
731 return 0;
732}
733EXPORT_SYMBOL(qdisc_class_hash_init);
734
735void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
736{
737 kvfree(clhash->hash);
738}
739EXPORT_SYMBOL(qdisc_class_hash_destroy);
740
741void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
742 struct Qdisc_class_common *cl)
743{
744 unsigned int h;
745
746 INIT_HLIST_NODE(&cl->hnode);
747 h = qdisc_class_hash(cl->classid, clhash->hashmask);
748 hlist_add_head(&cl->hnode, &clhash->hash[h]);
749 clhash->hashelems++;
750}
751EXPORT_SYMBOL(qdisc_class_hash_insert);
752
753void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
754 struct Qdisc_class_common *cl)
755{
756 hlist_del(&cl->hnode);
757 clhash->hashelems--;
758}
759EXPORT_SYMBOL(qdisc_class_hash_remove);
760
761/* Allocate an unique handle from space managed by kernel
762 * Possible range is [8000-FFFF]:0000 (0x8000 values)
763 */
764static u32 qdisc_alloc_handle(struct net_device *dev)
765{
766 int i = 0x8000;
767 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
768
769 do {
770 autohandle += TC_H_MAKE(0x10000U, 0);
771 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
772 autohandle = TC_H_MAKE(0x80000000U, 0);
773 if (!qdisc_lookup(dev, autohandle))
774 return autohandle;
775 cond_resched();
776 } while (--i > 0);
777
778 return 0;
779}
780
781void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len)
782{
783 bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED;
784 const struct Qdisc_class_ops *cops;
785 unsigned long cl;
786 u32 parentid;
787 bool notify;
788 int drops;
789
790 if (n == 0 && len == 0)
791 return;
792 drops = max_t(int, n, 0);
793 rcu_read_lock();
794 while ((parentid = sch->parent)) {
795 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
796 break;
797
798 if (sch->flags & TCQ_F_NOPARENT)
799 break;
800 /* Notify parent qdisc only if child qdisc becomes empty.
801 *
802 * If child was empty even before update then backlog
803 * counter is screwed and we skip notification because
804 * parent class is already passive.
805 *
806 * If the original child was offloaded then it is allowed
807 * to be seem as empty, so the parent is notified anyway.
808 */
809 notify = !sch->q.qlen && !WARN_ON_ONCE(!n &&
810 !qdisc_is_offloaded);
811 /* TODO: perform the search on a per txq basis */
812 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
813 if (sch == NULL) {
814 WARN_ON_ONCE(parentid != TC_H_ROOT);
815 break;
816 }
817 cops = sch->ops->cl_ops;
818 if (notify && cops->qlen_notify) {
819 cl = cops->find(sch, parentid);
820 cops->qlen_notify(sch, cl);
821 }
822 sch->q.qlen -= n;
823 sch->qstats.backlog -= len;
824 __qdisc_qstats_drop(sch, drops);
825 }
826 rcu_read_unlock();
827}
828EXPORT_SYMBOL(qdisc_tree_reduce_backlog);
829
830int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type,
831 void *type_data)
832{
833 struct net_device *dev = qdisc_dev(sch);
834 int err;
835
836 sch->flags &= ~TCQ_F_OFFLOADED;
837 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
838 return 0;
839
840 err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
841 if (err == -EOPNOTSUPP)
842 return 0;
843
844 if (!err)
845 sch->flags |= TCQ_F_OFFLOADED;
846
847 return err;
848}
849EXPORT_SYMBOL(qdisc_offload_dump_helper);
850
851void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
852 struct Qdisc *new, struct Qdisc *old,
853 enum tc_setup_type type, void *type_data,
854 struct netlink_ext_ack *extack)
855{
856 bool any_qdisc_is_offloaded;
857 int err;
858
859 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
860 return;
861
862 err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
863
864 /* Don't report error if the graft is part of destroy operation. */
865 if (!err || !new || new == &noop_qdisc)
866 return;
867
868 /* Don't report error if the parent, the old child and the new
869 * one are not offloaded.
870 */
871 any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED;
872 any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED;
873 any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED;
874
875 if (any_qdisc_is_offloaded)
876 NL_SET_ERR_MSG(extack, "Offloading graft operation failed.");
877}
878EXPORT_SYMBOL(qdisc_offload_graft_helper);
879
880void qdisc_offload_query_caps(struct net_device *dev,
881 enum tc_setup_type type,
882 void *caps, size_t caps_len)
883{
884 const struct net_device_ops *ops = dev->netdev_ops;
885 struct tc_query_caps_base base = {
886 .type = type,
887 .caps = caps,
888 };
889
890 memset(caps, 0, caps_len);
891
892 if (ops->ndo_setup_tc)
893 ops->ndo_setup_tc(dev, TC_QUERY_CAPS, &base);
894}
895EXPORT_SYMBOL(qdisc_offload_query_caps);
896
897static void qdisc_offload_graft_root(struct net_device *dev,
898 struct Qdisc *new, struct Qdisc *old,
899 struct netlink_ext_ack *extack)
900{
901 struct tc_root_qopt_offload graft_offload = {
902 .command = TC_ROOT_GRAFT,
903 .handle = new ? new->handle : 0,
904 .ingress = (new && new->flags & TCQ_F_INGRESS) ||
905 (old && old->flags & TCQ_F_INGRESS),
906 };
907
908 qdisc_offload_graft_helper(dev, NULL, new, old,
909 TC_SETUP_ROOT_QDISC, &graft_offload, extack);
910}
911
912static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
913 u32 portid, u32 seq, u16 flags, int event,
914 struct netlink_ext_ack *extack)
915{
916 struct gnet_stats_basic_sync __percpu *cpu_bstats = NULL;
917 struct gnet_stats_queue __percpu *cpu_qstats = NULL;
918 struct tcmsg *tcm;
919 struct nlmsghdr *nlh;
920 unsigned char *b = skb_tail_pointer(skb);
921 struct gnet_dump d;
922 struct qdisc_size_table *stab;
923 u32 block_index;
924 __u32 qlen;
925
926 cond_resched();
927 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
928 if (!nlh)
929 goto out_nlmsg_trim;
930 tcm = nlmsg_data(nlh);
931 tcm->tcm_family = AF_UNSPEC;
932 tcm->tcm__pad1 = 0;
933 tcm->tcm__pad2 = 0;
934 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
935 tcm->tcm_parent = clid;
936 tcm->tcm_handle = q->handle;
937 tcm->tcm_info = refcount_read(&q->refcnt);
938 if (nla_put_string(skb, TCA_KIND, q->ops->id))
939 goto nla_put_failure;
940 if (q->ops->ingress_block_get) {
941 block_index = q->ops->ingress_block_get(q);
942 if (block_index &&
943 nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index))
944 goto nla_put_failure;
945 }
946 if (q->ops->egress_block_get) {
947 block_index = q->ops->egress_block_get(q);
948 if (block_index &&
949 nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index))
950 goto nla_put_failure;
951 }
952 if (q->ops->dump && q->ops->dump(q, skb) < 0)
953 goto nla_put_failure;
954 if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED)))
955 goto nla_put_failure;
956 qlen = qdisc_qlen_sum(q);
957
958 stab = rtnl_dereference(q->stab);
959 if (stab && qdisc_dump_stab(skb, stab) < 0)
960 goto nla_put_failure;
961
962 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
963 NULL, &d, TCA_PAD) < 0)
964 goto nla_put_failure;
965
966 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
967 goto nla_put_failure;
968
969 if (qdisc_is_percpu_stats(q)) {
970 cpu_bstats = q->cpu_bstats;
971 cpu_qstats = q->cpu_qstats;
972 }
973
974 if (gnet_stats_copy_basic(&d, cpu_bstats, &q->bstats, true) < 0 ||
975 gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
976 gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0)
977 goto nla_put_failure;
978
979 if (gnet_stats_finish_copy(&d) < 0)
980 goto nla_put_failure;
981
982 if (extack && extack->_msg &&
983 nla_put_string(skb, TCA_EXT_WARN_MSG, extack->_msg))
984 goto out_nlmsg_trim;
985
986 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
987
988 return skb->len;
989
990out_nlmsg_trim:
991nla_put_failure:
992 nlmsg_trim(skb, b);
993 return -1;
994}
995
996static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible)
997{
998 if (q->flags & TCQ_F_BUILTIN)
999 return true;
1000 if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible)
1001 return true;
1002
1003 return false;
1004}
1005
1006static int qdisc_get_notify(struct net *net, struct sk_buff *oskb,
1007 struct nlmsghdr *n, u32 clid, struct Qdisc *q,
1008 struct netlink_ext_ack *extack)
1009{
1010 struct sk_buff *skb;
1011 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1012
1013 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1014 if (!skb)
1015 return -ENOBUFS;
1016
1017 if (!tc_qdisc_dump_ignore(q, false)) {
1018 if (tc_fill_qdisc(skb, q, clid, portid, n->nlmsg_seq, 0,
1019 RTM_NEWQDISC, extack) < 0)
1020 goto err_out;
1021 }
1022
1023 if (skb->len)
1024 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1025 n->nlmsg_flags & NLM_F_ECHO);
1026
1027err_out:
1028 kfree_skb(skb);
1029 return -EINVAL;
1030}
1031
1032static int qdisc_notify(struct net *net, struct sk_buff *oskb,
1033 struct nlmsghdr *n, u32 clid,
1034 struct Qdisc *old, struct Qdisc *new,
1035 struct netlink_ext_ack *extack)
1036{
1037 struct sk_buff *skb;
1038 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1039
1040 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC))
1041 return 0;
1042
1043 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1044 if (!skb)
1045 return -ENOBUFS;
1046
1047 if (old && !tc_qdisc_dump_ignore(old, false)) {
1048 if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
1049 0, RTM_DELQDISC, extack) < 0)
1050 goto err_out;
1051 }
1052 if (new && !tc_qdisc_dump_ignore(new, false)) {
1053 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
1054 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC, extack) < 0)
1055 goto err_out;
1056 }
1057
1058 if (skb->len)
1059 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1060 n->nlmsg_flags & NLM_F_ECHO);
1061
1062err_out:
1063 kfree_skb(skb);
1064 return -EINVAL;
1065}
1066
1067static void notify_and_destroy(struct net *net, struct sk_buff *skb,
1068 struct nlmsghdr *n, u32 clid,
1069 struct Qdisc *old, struct Qdisc *new,
1070 struct netlink_ext_ack *extack)
1071{
1072 if (new || old)
1073 qdisc_notify(net, skb, n, clid, old, new, extack);
1074
1075 if (old)
1076 qdisc_put(old);
1077}
1078
1079static void qdisc_clear_nolock(struct Qdisc *sch)
1080{
1081 sch->flags &= ~TCQ_F_NOLOCK;
1082 if (!(sch->flags & TCQ_F_CPUSTATS))
1083 return;
1084
1085 free_percpu(sch->cpu_bstats);
1086 free_percpu(sch->cpu_qstats);
1087 sch->cpu_bstats = NULL;
1088 sch->cpu_qstats = NULL;
1089 sch->flags &= ~TCQ_F_CPUSTATS;
1090}
1091
1092/* Graft qdisc "new" to class "classid" of qdisc "parent" or
1093 * to device "dev".
1094 *
1095 * When appropriate send a netlink notification using 'skb'
1096 * and "n".
1097 *
1098 * On success, destroy old qdisc.
1099 */
1100
1101static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
1102 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
1103 struct Qdisc *new, struct Qdisc *old,
1104 struct netlink_ext_ack *extack)
1105{
1106 struct Qdisc *q = old;
1107 struct net *net = dev_net(dev);
1108
1109 if (parent == NULL) {
1110 unsigned int i, num_q, ingress;
1111 struct netdev_queue *dev_queue;
1112
1113 ingress = 0;
1114 num_q = dev->num_tx_queues;
1115 if ((q && q->flags & TCQ_F_INGRESS) ||
1116 (new && new->flags & TCQ_F_INGRESS)) {
1117 ingress = 1;
1118 dev_queue = dev_ingress_queue(dev);
1119 if (!dev_queue) {
1120 NL_SET_ERR_MSG(extack, "Device does not have an ingress queue");
1121 return -ENOENT;
1122 }
1123
1124 q = rtnl_dereference(dev_queue->qdisc_sleeping);
1125
1126 /* This is the counterpart of that qdisc_refcount_inc_nz() call in
1127 * __tcf_qdisc_find() for filter requests.
1128 */
1129 if (!qdisc_refcount_dec_if_one(q)) {
1130 NL_SET_ERR_MSG(extack,
1131 "Current ingress or clsact Qdisc has ongoing filter requests");
1132 return -EBUSY;
1133 }
1134 }
1135
1136 if (dev->flags & IFF_UP)
1137 dev_deactivate(dev);
1138
1139 qdisc_offload_graft_root(dev, new, old, extack);
1140
1141 if (new && new->ops->attach && !ingress)
1142 goto skip;
1143
1144 if (!ingress) {
1145 for (i = 0; i < num_q; i++) {
1146 dev_queue = netdev_get_tx_queue(dev, i);
1147 old = dev_graft_qdisc(dev_queue, new);
1148
1149 if (new && i > 0)
1150 qdisc_refcount_inc(new);
1151 qdisc_put(old);
1152 }
1153 } else {
1154 old = dev_graft_qdisc(dev_queue, NULL);
1155
1156 /* {ingress,clsact}_destroy() @old before grafting @new to avoid
1157 * unprotected concurrent accesses to net_device::miniq_{in,e}gress
1158 * pointer(s) in mini_qdisc_pair_swap().
1159 */
1160 qdisc_notify(net, skb, n, classid, old, new, extack);
1161 qdisc_destroy(old);
1162
1163 dev_graft_qdisc(dev_queue, new);
1164 }
1165
1166skip:
1167 if (!ingress) {
1168 old = rtnl_dereference(dev->qdisc);
1169 if (new && !new->ops->attach)
1170 qdisc_refcount_inc(new);
1171 rcu_assign_pointer(dev->qdisc, new ? : &noop_qdisc);
1172
1173 notify_and_destroy(net, skb, n, classid, old, new, extack);
1174
1175 if (new && new->ops->attach)
1176 new->ops->attach(new);
1177 }
1178
1179 if (dev->flags & IFF_UP)
1180 dev_activate(dev);
1181 } else {
1182 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
1183 unsigned long cl;
1184 int err;
1185
1186 /* Only support running class lockless if parent is lockless */
1187 if (new && (new->flags & TCQ_F_NOLOCK) && !(parent->flags & TCQ_F_NOLOCK))
1188 qdisc_clear_nolock(new);
1189
1190 if (!cops || !cops->graft)
1191 return -EOPNOTSUPP;
1192
1193 cl = cops->find(parent, classid);
1194 if (!cl) {
1195 NL_SET_ERR_MSG(extack, "Specified class not found");
1196 return -ENOENT;
1197 }
1198
1199 if (new && new->ops == &noqueue_qdisc_ops) {
1200 NL_SET_ERR_MSG(extack, "Cannot assign noqueue to a class");
1201 return -EINVAL;
1202 }
1203
1204 err = cops->graft(parent, cl, new, &old, extack);
1205 if (err)
1206 return err;
1207 notify_and_destroy(net, skb, n, classid, old, new, extack);
1208 }
1209 return 0;
1210}
1211
1212static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca,
1213 struct netlink_ext_ack *extack)
1214{
1215 u32 block_index;
1216
1217 if (tca[TCA_INGRESS_BLOCK]) {
1218 block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]);
1219
1220 if (!block_index) {
1221 NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0");
1222 return -EINVAL;
1223 }
1224 if (!sch->ops->ingress_block_set) {
1225 NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported");
1226 return -EOPNOTSUPP;
1227 }
1228 sch->ops->ingress_block_set(sch, block_index);
1229 }
1230 if (tca[TCA_EGRESS_BLOCK]) {
1231 block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]);
1232
1233 if (!block_index) {
1234 NL_SET_ERR_MSG(extack, "Egress block index cannot be 0");
1235 return -EINVAL;
1236 }
1237 if (!sch->ops->egress_block_set) {
1238 NL_SET_ERR_MSG(extack, "Egress block sharing is not supported");
1239 return -EOPNOTSUPP;
1240 }
1241 sch->ops->egress_block_set(sch, block_index);
1242 }
1243 return 0;
1244}
1245
1246/*
1247 Allocate and initialize new qdisc.
1248
1249 Parameters are passed via opt.
1250 */
1251
1252static struct Qdisc *qdisc_create(struct net_device *dev,
1253 struct netdev_queue *dev_queue,
1254 u32 parent, u32 handle,
1255 struct nlattr **tca, int *errp,
1256 struct netlink_ext_ack *extack)
1257{
1258 int err;
1259 struct nlattr *kind = tca[TCA_KIND];
1260 struct Qdisc *sch;
1261 struct Qdisc_ops *ops;
1262 struct qdisc_size_table *stab;
1263
1264 ops = qdisc_lookup_ops(kind);
1265#ifdef CONFIG_MODULES
1266 if (ops == NULL && kind != NULL) {
1267 char name[IFNAMSIZ];
1268 if (nla_strscpy(name, kind, IFNAMSIZ) >= 0) {
1269 /* We dropped the RTNL semaphore in order to
1270 * perform the module load. So, even if we
1271 * succeeded in loading the module we have to
1272 * tell the caller to replay the request. We
1273 * indicate this using -EAGAIN.
1274 * We replay the request because the device may
1275 * go away in the mean time.
1276 */
1277 rtnl_unlock();
1278 request_module("sch_%s", name);
1279 rtnl_lock();
1280 ops = qdisc_lookup_ops(kind);
1281 if (ops != NULL) {
1282 /* We will try again qdisc_lookup_ops,
1283 * so don't keep a reference.
1284 */
1285 module_put(ops->owner);
1286 err = -EAGAIN;
1287 goto err_out;
1288 }
1289 }
1290 }
1291#endif
1292
1293 err = -ENOENT;
1294 if (!ops) {
1295 NL_SET_ERR_MSG(extack, "Specified qdisc kind is unknown");
1296 goto err_out;
1297 }
1298
1299 sch = qdisc_alloc(dev_queue, ops, extack);
1300 if (IS_ERR(sch)) {
1301 err = PTR_ERR(sch);
1302 goto err_out2;
1303 }
1304
1305 sch->parent = parent;
1306
1307 if (handle == TC_H_INGRESS) {
1308 if (!(sch->flags & TCQ_F_INGRESS)) {
1309 NL_SET_ERR_MSG(extack,
1310 "Specified parent ID is reserved for ingress and clsact Qdiscs");
1311 err = -EINVAL;
1312 goto err_out3;
1313 }
1314 handle = TC_H_MAKE(TC_H_INGRESS, 0);
1315 } else {
1316 if (handle == 0) {
1317 handle = qdisc_alloc_handle(dev);
1318 if (handle == 0) {
1319 NL_SET_ERR_MSG(extack, "Maximum number of qdisc handles was exceeded");
1320 err = -ENOSPC;
1321 goto err_out3;
1322 }
1323 }
1324 if (!netif_is_multiqueue(dev))
1325 sch->flags |= TCQ_F_ONETXQUEUE;
1326 }
1327
1328 sch->handle = handle;
1329
1330 /* This exist to keep backward compatible with a userspace
1331 * loophole, what allowed userspace to get IFF_NO_QUEUE
1332 * facility on older kernels by setting tx_queue_len=0 (prior
1333 * to qdisc init), and then forgot to reinit tx_queue_len
1334 * before again attaching a qdisc.
1335 */
1336 if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) {
1337 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
1338 netdev_info(dev, "Caught tx_queue_len zero misconfig\n");
1339 }
1340
1341 err = qdisc_block_indexes_set(sch, tca, extack);
1342 if (err)
1343 goto err_out3;
1344
1345 if (tca[TCA_STAB]) {
1346 stab = qdisc_get_stab(tca[TCA_STAB], extack);
1347 if (IS_ERR(stab)) {
1348 err = PTR_ERR(stab);
1349 goto err_out3;
1350 }
1351 rcu_assign_pointer(sch->stab, stab);
1352 }
1353
1354 if (ops->init) {
1355 err = ops->init(sch, tca[TCA_OPTIONS], extack);
1356 if (err != 0)
1357 goto err_out4;
1358 }
1359
1360 if (tca[TCA_RATE]) {
1361 err = -EOPNOTSUPP;
1362 if (sch->flags & TCQ_F_MQROOT) {
1363 NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc");
1364 goto err_out4;
1365 }
1366
1367 err = gen_new_estimator(&sch->bstats,
1368 sch->cpu_bstats,
1369 &sch->rate_est,
1370 NULL,
1371 true,
1372 tca[TCA_RATE]);
1373 if (err) {
1374 NL_SET_ERR_MSG(extack, "Failed to generate new estimator");
1375 goto err_out4;
1376 }
1377 }
1378
1379 qdisc_hash_add(sch, false);
1380 trace_qdisc_create(ops, dev, parent);
1381
1382 return sch;
1383
1384err_out4:
1385 /* Even if ops->init() failed, we call ops->destroy()
1386 * like qdisc_create_dflt().
1387 */
1388 if (ops->destroy)
1389 ops->destroy(sch);
1390 qdisc_put_stab(rtnl_dereference(sch->stab));
1391err_out3:
1392 netdev_put(dev, &sch->dev_tracker);
1393 qdisc_free(sch);
1394err_out2:
1395 module_put(ops->owner);
1396err_out:
1397 *errp = err;
1398 return NULL;
1399}
1400
1401static int qdisc_change(struct Qdisc *sch, struct nlattr **tca,
1402 struct netlink_ext_ack *extack)
1403{
1404 struct qdisc_size_table *ostab, *stab = NULL;
1405 int err = 0;
1406
1407 if (tca[TCA_OPTIONS]) {
1408 if (!sch->ops->change) {
1409 NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc");
1410 return -EINVAL;
1411 }
1412 if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
1413 NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
1414 return -EOPNOTSUPP;
1415 }
1416 err = sch->ops->change(sch, tca[TCA_OPTIONS], extack);
1417 if (err)
1418 return err;
1419 }
1420
1421 if (tca[TCA_STAB]) {
1422 stab = qdisc_get_stab(tca[TCA_STAB], extack);
1423 if (IS_ERR(stab))
1424 return PTR_ERR(stab);
1425 }
1426
1427 ostab = rtnl_dereference(sch->stab);
1428 rcu_assign_pointer(sch->stab, stab);
1429 qdisc_put_stab(ostab);
1430
1431 if (tca[TCA_RATE]) {
1432 /* NB: ignores errors from replace_estimator
1433 because change can't be undone. */
1434 if (sch->flags & TCQ_F_MQROOT)
1435 goto out;
1436 gen_replace_estimator(&sch->bstats,
1437 sch->cpu_bstats,
1438 &sch->rate_est,
1439 NULL,
1440 true,
1441 tca[TCA_RATE]);
1442 }
1443out:
1444 return 0;
1445}
1446
1447struct check_loop_arg {
1448 struct qdisc_walker w;
1449 struct Qdisc *p;
1450 int depth;
1451};
1452
1453static int check_loop_fn(struct Qdisc *q, unsigned long cl,
1454 struct qdisc_walker *w);
1455
1456static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
1457{
1458 struct check_loop_arg arg;
1459
1460 if (q->ops->cl_ops == NULL)
1461 return 0;
1462
1463 arg.w.stop = arg.w.skip = arg.w.count = 0;
1464 arg.w.fn = check_loop_fn;
1465 arg.depth = depth;
1466 arg.p = p;
1467 q->ops->cl_ops->walk(q, &arg.w);
1468 return arg.w.stop ? -ELOOP : 0;
1469}
1470
1471static int
1472check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
1473{
1474 struct Qdisc *leaf;
1475 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1476 struct check_loop_arg *arg = (struct check_loop_arg *)w;
1477
1478 leaf = cops->leaf(q, cl);
1479 if (leaf) {
1480 if (leaf == arg->p || arg->depth > 7)
1481 return -ELOOP;
1482 return check_loop(leaf, arg->p, arg->depth + 1);
1483 }
1484 return 0;
1485}
1486
1487const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = {
1488 [TCA_KIND] = { .type = NLA_STRING },
1489 [TCA_RATE] = { .type = NLA_BINARY,
1490 .len = sizeof(struct tc_estimator) },
1491 [TCA_STAB] = { .type = NLA_NESTED },
1492 [TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG },
1493 [TCA_CHAIN] = { .type = NLA_U32 },
1494 [TCA_INGRESS_BLOCK] = { .type = NLA_U32 },
1495 [TCA_EGRESS_BLOCK] = { .type = NLA_U32 },
1496};
1497
1498/*
1499 * Delete/get qdisc.
1500 */
1501
1502static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
1503 struct netlink_ext_ack *extack)
1504{
1505 struct net *net = sock_net(skb->sk);
1506 struct tcmsg *tcm = nlmsg_data(n);
1507 struct nlattr *tca[TCA_MAX + 1];
1508 struct net_device *dev;
1509 u32 clid;
1510 struct Qdisc *q = NULL;
1511 struct Qdisc *p = NULL;
1512 int err;
1513
1514 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
1515 rtm_tca_policy, extack);
1516 if (err < 0)
1517 return err;
1518
1519 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1520 if (!dev)
1521 return -ENODEV;
1522
1523 clid = tcm->tcm_parent;
1524 if (clid) {
1525 if (clid != TC_H_ROOT) {
1526 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
1527 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1528 if (!p) {
1529 NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid");
1530 return -ENOENT;
1531 }
1532 q = qdisc_leaf(p, clid);
1533 } else if (dev_ingress_queue(dev)) {
1534 q = rtnl_dereference(dev_ingress_queue(dev)->qdisc_sleeping);
1535 }
1536 } else {
1537 q = rtnl_dereference(dev->qdisc);
1538 }
1539 if (!q) {
1540 NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device");
1541 return -ENOENT;
1542 }
1543
1544 if (tcm->tcm_handle && q->handle != tcm->tcm_handle) {
1545 NL_SET_ERR_MSG(extack, "Invalid handle");
1546 return -EINVAL;
1547 }
1548 } else {
1549 q = qdisc_lookup(dev, tcm->tcm_handle);
1550 if (!q) {
1551 NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle");
1552 return -ENOENT;
1553 }
1554 }
1555
1556 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1557 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1558 return -EINVAL;
1559 }
1560
1561 if (n->nlmsg_type == RTM_DELQDISC) {
1562 if (!clid) {
1563 NL_SET_ERR_MSG(extack, "Classid cannot be zero");
1564 return -EINVAL;
1565 }
1566 if (q->handle == 0) {
1567 NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero");
1568 return -ENOENT;
1569 }
1570 err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack);
1571 if (err != 0)
1572 return err;
1573 } else {
1574 qdisc_get_notify(net, skb, n, clid, q, NULL);
1575 }
1576 return 0;
1577}
1578
1579static bool req_create_or_replace(struct nlmsghdr *n)
1580{
1581 return (n->nlmsg_flags & NLM_F_CREATE &&
1582 n->nlmsg_flags & NLM_F_REPLACE);
1583}
1584
1585static bool req_create_exclusive(struct nlmsghdr *n)
1586{
1587 return (n->nlmsg_flags & NLM_F_CREATE &&
1588 n->nlmsg_flags & NLM_F_EXCL);
1589}
1590
1591static bool req_change(struct nlmsghdr *n)
1592{
1593 return (!(n->nlmsg_flags & NLM_F_CREATE) &&
1594 !(n->nlmsg_flags & NLM_F_REPLACE) &&
1595 !(n->nlmsg_flags & NLM_F_EXCL));
1596}
1597
1598/*
1599 * Create/change qdisc.
1600 */
1601static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
1602 struct netlink_ext_ack *extack)
1603{
1604 struct net *net = sock_net(skb->sk);
1605 struct tcmsg *tcm;
1606 struct nlattr *tca[TCA_MAX + 1];
1607 struct net_device *dev;
1608 u32 clid;
1609 struct Qdisc *q, *p;
1610 int err;
1611
1612replay:
1613 /* Reinit, just in case something touches this. */
1614 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
1615 rtm_tca_policy, extack);
1616 if (err < 0)
1617 return err;
1618
1619 tcm = nlmsg_data(n);
1620 clid = tcm->tcm_parent;
1621 q = p = NULL;
1622
1623 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1624 if (!dev)
1625 return -ENODEV;
1626
1627
1628 if (clid) {
1629 if (clid != TC_H_ROOT) {
1630 if (clid != TC_H_INGRESS) {
1631 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1632 if (!p) {
1633 NL_SET_ERR_MSG(extack, "Failed to find specified qdisc");
1634 return -ENOENT;
1635 }
1636 q = qdisc_leaf(p, clid);
1637 } else if (dev_ingress_queue_create(dev)) {
1638 q = rtnl_dereference(dev_ingress_queue(dev)->qdisc_sleeping);
1639 }
1640 } else {
1641 q = rtnl_dereference(dev->qdisc);
1642 }
1643
1644 /* It may be default qdisc, ignore it */
1645 if (q && q->handle == 0)
1646 q = NULL;
1647
1648 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1649 if (tcm->tcm_handle) {
1650 if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) {
1651 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override");
1652 return -EEXIST;
1653 }
1654 if (TC_H_MIN(tcm->tcm_handle)) {
1655 NL_SET_ERR_MSG(extack, "Invalid minor handle");
1656 return -EINVAL;
1657 }
1658 q = qdisc_lookup(dev, tcm->tcm_handle);
1659 if (!q)
1660 goto create_n_graft;
1661 if (n->nlmsg_flags & NLM_F_EXCL) {
1662 NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override");
1663 return -EEXIST;
1664 }
1665 if (tca[TCA_KIND] &&
1666 nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1667 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1668 return -EINVAL;
1669 }
1670 if (q->flags & TCQ_F_INGRESS) {
1671 NL_SET_ERR_MSG(extack,
1672 "Cannot regraft ingress or clsact Qdiscs");
1673 return -EINVAL;
1674 }
1675 if (q == p ||
1676 (p && check_loop(q, p, 0))) {
1677 NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected");
1678 return -ELOOP;
1679 }
1680 if (clid == TC_H_INGRESS) {
1681 NL_SET_ERR_MSG(extack, "Ingress cannot graft directly");
1682 return -EINVAL;
1683 }
1684 qdisc_refcount_inc(q);
1685 goto graft;
1686 } else {
1687 if (!q)
1688 goto create_n_graft;
1689
1690 /* This magic test requires explanation.
1691 *
1692 * We know, that some child q is already
1693 * attached to this parent and have choice:
1694 * 1) change it or 2) create/graft new one.
1695 * If the requested qdisc kind is different
1696 * than the existing one, then we choose graft.
1697 * If they are the same then this is "change"
1698 * operation - just let it fallthrough..
1699 *
1700 * 1. We are allowed to create/graft only
1701 * if the request is explicitly stating
1702 * "please create if it doesn't exist".
1703 *
1704 * 2. If the request is to exclusive create
1705 * then the qdisc tcm_handle is not expected
1706 * to exist, so that we choose create/graft too.
1707 *
1708 * 3. The last case is when no flags are set.
1709 * This will happen when for example tc
1710 * utility issues a "change" command.
1711 * Alas, it is sort of hole in API, we
1712 * cannot decide what to do unambiguously.
1713 * For now we select create/graft.
1714 */
1715 if (tca[TCA_KIND] &&
1716 nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1717 if (req_create_or_replace(n) ||
1718 req_create_exclusive(n))
1719 goto create_n_graft;
1720 else if (req_change(n))
1721 goto create_n_graft2;
1722 }
1723 }
1724 }
1725 } else {
1726 if (!tcm->tcm_handle) {
1727 NL_SET_ERR_MSG(extack, "Handle cannot be zero");
1728 return -EINVAL;
1729 }
1730 q = qdisc_lookup(dev, tcm->tcm_handle);
1731 }
1732
1733 /* Change qdisc parameters */
1734 if (!q) {
1735 NL_SET_ERR_MSG(extack, "Specified qdisc not found");
1736 return -ENOENT;
1737 }
1738 if (n->nlmsg_flags & NLM_F_EXCL) {
1739 NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify");
1740 return -EEXIST;
1741 }
1742 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1743 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1744 return -EINVAL;
1745 }
1746 err = qdisc_change(q, tca, extack);
1747 if (err == 0)
1748 qdisc_notify(net, skb, n, clid, NULL, q, extack);
1749 return err;
1750
1751create_n_graft:
1752 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1753 NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag");
1754 return -ENOENT;
1755 }
1756create_n_graft2:
1757 if (clid == TC_H_INGRESS) {
1758 if (dev_ingress_queue(dev)) {
1759 q = qdisc_create(dev, dev_ingress_queue(dev),
1760 tcm->tcm_parent, tcm->tcm_parent,
1761 tca, &err, extack);
1762 } else {
1763 NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device");
1764 err = -ENOENT;
1765 }
1766 } else {
1767 struct netdev_queue *dev_queue;
1768
1769 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1770 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1771 else if (p)
1772 dev_queue = p->dev_queue;
1773 else
1774 dev_queue = netdev_get_tx_queue(dev, 0);
1775
1776 q = qdisc_create(dev, dev_queue,
1777 tcm->tcm_parent, tcm->tcm_handle,
1778 tca, &err, extack);
1779 }
1780 if (q == NULL) {
1781 if (err == -EAGAIN)
1782 goto replay;
1783 return err;
1784 }
1785
1786graft:
1787 err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack);
1788 if (err) {
1789 if (q)
1790 qdisc_put(q);
1791 return err;
1792 }
1793
1794 return 0;
1795}
1796
1797static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1798 struct netlink_callback *cb,
1799 int *q_idx_p, int s_q_idx, bool recur,
1800 bool dump_invisible)
1801{
1802 int ret = 0, q_idx = *q_idx_p;
1803 struct Qdisc *q;
1804 int b;
1805
1806 if (!root)
1807 return 0;
1808
1809 q = root;
1810 if (q_idx < s_q_idx) {
1811 q_idx++;
1812 } else {
1813 if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1814 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1815 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1816 RTM_NEWQDISC, NULL) <= 0)
1817 goto done;
1818 q_idx++;
1819 }
1820
1821 /* If dumping singletons, there is no qdisc_dev(root) and the singleton
1822 * itself has already been dumped.
1823 *
1824 * If we've already dumped the top-level (ingress) qdisc above and the global
1825 * qdisc hashtable, we don't want to hit it again
1826 */
1827 if (!qdisc_dev(root) || !recur)
1828 goto out;
1829
1830 hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
1831 if (q_idx < s_q_idx) {
1832 q_idx++;
1833 continue;
1834 }
1835 if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1836 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1837 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1838 RTM_NEWQDISC, NULL) <= 0)
1839 goto done;
1840 q_idx++;
1841 }
1842
1843out:
1844 *q_idx_p = q_idx;
1845 return ret;
1846done:
1847 ret = -1;
1848 goto out;
1849}
1850
1851static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1852{
1853 struct net *net = sock_net(skb->sk);
1854 int idx, q_idx;
1855 int s_idx, s_q_idx;
1856 struct net_device *dev;
1857 const struct nlmsghdr *nlh = cb->nlh;
1858 struct nlattr *tca[TCA_MAX + 1];
1859 int err;
1860
1861 s_idx = cb->args[0];
1862 s_q_idx = q_idx = cb->args[1];
1863
1864 idx = 0;
1865 ASSERT_RTNL();
1866
1867 err = nlmsg_parse_deprecated(nlh, sizeof(struct tcmsg), tca, TCA_MAX,
1868 rtm_tca_policy, cb->extack);
1869 if (err < 0)
1870 return err;
1871
1872 for_each_netdev(net, dev) {
1873 struct netdev_queue *dev_queue;
1874
1875 if (idx < s_idx)
1876 goto cont;
1877 if (idx > s_idx)
1878 s_q_idx = 0;
1879 q_idx = 0;
1880
1881 if (tc_dump_qdisc_root(rtnl_dereference(dev->qdisc),
1882 skb, cb, &q_idx, s_q_idx,
1883 true, tca[TCA_DUMP_INVISIBLE]) < 0)
1884 goto done;
1885
1886 dev_queue = dev_ingress_queue(dev);
1887 if (dev_queue &&
1888 tc_dump_qdisc_root(rtnl_dereference(dev_queue->qdisc_sleeping),
1889 skb, cb, &q_idx, s_q_idx, false,
1890 tca[TCA_DUMP_INVISIBLE]) < 0)
1891 goto done;
1892
1893cont:
1894 idx++;
1895 }
1896
1897done:
1898 cb->args[0] = idx;
1899 cb->args[1] = q_idx;
1900
1901 return skb->len;
1902}
1903
1904
1905
1906/************************************************
1907 * Traffic classes manipulation. *
1908 ************************************************/
1909
1910static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1911 unsigned long cl, u32 portid, u32 seq, u16 flags,
1912 int event, struct netlink_ext_ack *extack)
1913{
1914 struct tcmsg *tcm;
1915 struct nlmsghdr *nlh;
1916 unsigned char *b = skb_tail_pointer(skb);
1917 struct gnet_dump d;
1918 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1919
1920 cond_resched();
1921 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1922 if (!nlh)
1923 goto out_nlmsg_trim;
1924 tcm = nlmsg_data(nlh);
1925 tcm->tcm_family = AF_UNSPEC;
1926 tcm->tcm__pad1 = 0;
1927 tcm->tcm__pad2 = 0;
1928 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1929 tcm->tcm_parent = q->handle;
1930 tcm->tcm_handle = q->handle;
1931 tcm->tcm_info = 0;
1932 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1933 goto nla_put_failure;
1934 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1935 goto nla_put_failure;
1936
1937 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1938 NULL, &d, TCA_PAD) < 0)
1939 goto nla_put_failure;
1940
1941 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1942 goto nla_put_failure;
1943
1944 if (gnet_stats_finish_copy(&d) < 0)
1945 goto nla_put_failure;
1946
1947 if (extack && extack->_msg &&
1948 nla_put_string(skb, TCA_EXT_WARN_MSG, extack->_msg))
1949 goto out_nlmsg_trim;
1950
1951 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1952
1953 return skb->len;
1954
1955out_nlmsg_trim:
1956nla_put_failure:
1957 nlmsg_trim(skb, b);
1958 return -1;
1959}
1960
1961static int tclass_notify(struct net *net, struct sk_buff *oskb,
1962 struct nlmsghdr *n, struct Qdisc *q,
1963 unsigned long cl, int event, struct netlink_ext_ack *extack)
1964{
1965 struct sk_buff *skb;
1966 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1967
1968 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC))
1969 return 0;
1970
1971 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1972 if (!skb)
1973 return -ENOBUFS;
1974
1975 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event, extack) < 0) {
1976 kfree_skb(skb);
1977 return -EINVAL;
1978 }
1979
1980 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1981 n->nlmsg_flags & NLM_F_ECHO);
1982}
1983
1984static int tclass_get_notify(struct net *net, struct sk_buff *oskb,
1985 struct nlmsghdr *n, struct Qdisc *q,
1986 unsigned long cl, struct netlink_ext_ack *extack)
1987{
1988 struct sk_buff *skb;
1989 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1990
1991 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1992 if (!skb)
1993 return -ENOBUFS;
1994
1995 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, RTM_NEWTCLASS,
1996 extack) < 0) {
1997 kfree_skb(skb);
1998 return -EINVAL;
1999 }
2000
2001 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2002 n->nlmsg_flags & NLM_F_ECHO);
2003}
2004
2005static int tclass_del_notify(struct net *net,
2006 const struct Qdisc_class_ops *cops,
2007 struct sk_buff *oskb, struct nlmsghdr *n,
2008 struct Qdisc *q, unsigned long cl,
2009 struct netlink_ext_ack *extack)
2010{
2011 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2012 struct sk_buff *skb;
2013 int err = 0;
2014
2015 if (!cops->delete)
2016 return -EOPNOTSUPP;
2017
2018 if (rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
2019 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2020 if (!skb)
2021 return -ENOBUFS;
2022
2023 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
2024 RTM_DELTCLASS, extack) < 0) {
2025 kfree_skb(skb);
2026 return -EINVAL;
2027 }
2028 } else {
2029 skb = NULL;
2030 }
2031
2032 err = cops->delete(q, cl, extack);
2033 if (err) {
2034 kfree_skb(skb);
2035 return err;
2036 }
2037
2038 err = rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
2039 n->nlmsg_flags & NLM_F_ECHO);
2040 return err;
2041}
2042
2043#ifdef CONFIG_NET_CLS
2044
2045struct tcf_bind_args {
2046 struct tcf_walker w;
2047 unsigned long base;
2048 unsigned long cl;
2049 u32 classid;
2050};
2051
2052static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
2053{
2054 struct tcf_bind_args *a = (void *)arg;
2055
2056 if (n && tp->ops->bind_class) {
2057 struct Qdisc *q = tcf_block_q(tp->chain->block);
2058
2059 sch_tree_lock(q);
2060 tp->ops->bind_class(n, a->classid, a->cl, q, a->base);
2061 sch_tree_unlock(q);
2062 }
2063 return 0;
2064}
2065
2066struct tc_bind_class_args {
2067 struct qdisc_walker w;
2068 unsigned long new_cl;
2069 u32 portid;
2070 u32 clid;
2071};
2072
2073static int tc_bind_class_walker(struct Qdisc *q, unsigned long cl,
2074 struct qdisc_walker *w)
2075{
2076 struct tc_bind_class_args *a = (struct tc_bind_class_args *)w;
2077 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
2078 struct tcf_block *block;
2079 struct tcf_chain *chain;
2080
2081 block = cops->tcf_block(q, cl, NULL);
2082 if (!block)
2083 return 0;
2084 for (chain = tcf_get_next_chain(block, NULL);
2085 chain;
2086 chain = tcf_get_next_chain(block, chain)) {
2087 struct tcf_proto *tp;
2088
2089 for (tp = tcf_get_next_proto(chain, NULL);
2090 tp; tp = tcf_get_next_proto(chain, tp)) {
2091 struct tcf_bind_args arg = {};
2092
2093 arg.w.fn = tcf_node_bind;
2094 arg.classid = a->clid;
2095 arg.base = cl;
2096 arg.cl = a->new_cl;
2097 tp->ops->walk(tp, &arg.w, true);
2098 }
2099 }
2100
2101 return 0;
2102}
2103
2104static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
2105 unsigned long new_cl)
2106{
2107 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
2108 struct tc_bind_class_args args = {};
2109
2110 if (!cops->tcf_block)
2111 return;
2112 args.portid = portid;
2113 args.clid = clid;
2114 args.new_cl = new_cl;
2115 args.w.fn = tc_bind_class_walker;
2116 q->ops->cl_ops->walk(q, &args.w);
2117}
2118
2119#else
2120
2121static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
2122 unsigned long new_cl)
2123{
2124}
2125
2126#endif
2127
2128static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
2129 struct netlink_ext_ack *extack)
2130{
2131 struct net *net = sock_net(skb->sk);
2132 struct tcmsg *tcm = nlmsg_data(n);
2133 struct nlattr *tca[TCA_MAX + 1];
2134 struct net_device *dev;
2135 struct Qdisc *q = NULL;
2136 const struct Qdisc_class_ops *cops;
2137 unsigned long cl = 0;
2138 unsigned long new_cl;
2139 u32 portid;
2140 u32 clid;
2141 u32 qid;
2142 int err;
2143
2144 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
2145 rtm_tca_policy, extack);
2146 if (err < 0)
2147 return err;
2148
2149 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2150 if (!dev)
2151 return -ENODEV;
2152
2153 /*
2154 parent == TC_H_UNSPEC - unspecified parent.
2155 parent == TC_H_ROOT - class is root, which has no parent.
2156 parent == X:0 - parent is root class.
2157 parent == X:Y - parent is a node in hierarchy.
2158 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
2159
2160 handle == 0:0 - generate handle from kernel pool.
2161 handle == 0:Y - class is X:Y, where X:0 is qdisc.
2162 handle == X:Y - clear.
2163 handle == X:0 - root class.
2164 */
2165
2166 /* Step 1. Determine qdisc handle X:0 */
2167
2168 portid = tcm->tcm_parent;
2169 clid = tcm->tcm_handle;
2170 qid = TC_H_MAJ(clid);
2171
2172 if (portid != TC_H_ROOT) {
2173 u32 qid1 = TC_H_MAJ(portid);
2174
2175 if (qid && qid1) {
2176 /* If both majors are known, they must be identical. */
2177 if (qid != qid1)
2178 return -EINVAL;
2179 } else if (qid1) {
2180 qid = qid1;
2181 } else if (qid == 0)
2182 qid = rtnl_dereference(dev->qdisc)->handle;
2183
2184 /* Now qid is genuine qdisc handle consistent
2185 * both with parent and child.
2186 *
2187 * TC_H_MAJ(portid) still may be unspecified, complete it now.
2188 */
2189 if (portid)
2190 portid = TC_H_MAKE(qid, portid);
2191 } else {
2192 if (qid == 0)
2193 qid = rtnl_dereference(dev->qdisc)->handle;
2194 }
2195
2196 /* OK. Locate qdisc */
2197 q = qdisc_lookup(dev, qid);
2198 if (!q)
2199 return -ENOENT;
2200
2201 /* An check that it supports classes */
2202 cops = q->ops->cl_ops;
2203 if (cops == NULL)
2204 return -EINVAL;
2205
2206 /* Now try to get class */
2207 if (clid == 0) {
2208 if (portid == TC_H_ROOT)
2209 clid = qid;
2210 } else
2211 clid = TC_H_MAKE(qid, clid);
2212
2213 if (clid)
2214 cl = cops->find(q, clid);
2215
2216 if (cl == 0) {
2217 err = -ENOENT;
2218 if (n->nlmsg_type != RTM_NEWTCLASS ||
2219 !(n->nlmsg_flags & NLM_F_CREATE))
2220 goto out;
2221 } else {
2222 switch (n->nlmsg_type) {
2223 case RTM_NEWTCLASS:
2224 err = -EEXIST;
2225 if (n->nlmsg_flags & NLM_F_EXCL)
2226 goto out;
2227 break;
2228 case RTM_DELTCLASS:
2229 err = tclass_del_notify(net, cops, skb, n, q, cl, extack);
2230 /* Unbind the class with flilters with 0 */
2231 tc_bind_tclass(q, portid, clid, 0);
2232 goto out;
2233 case RTM_GETTCLASS:
2234 err = tclass_get_notify(net, skb, n, q, cl, extack);
2235 goto out;
2236 default:
2237 err = -EINVAL;
2238 goto out;
2239 }
2240 }
2241
2242 if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
2243 NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes");
2244 return -EOPNOTSUPP;
2245 }
2246
2247 new_cl = cl;
2248 err = -EOPNOTSUPP;
2249 if (cops->change)
2250 err = cops->change(q, clid, portid, tca, &new_cl, extack);
2251 if (err == 0) {
2252 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS, extack);
2253 /* We just create a new class, need to do reverse binding. */
2254 if (cl != new_cl)
2255 tc_bind_tclass(q, portid, clid, new_cl);
2256 }
2257out:
2258 return err;
2259}
2260
2261struct qdisc_dump_args {
2262 struct qdisc_walker w;
2263 struct sk_buff *skb;
2264 struct netlink_callback *cb;
2265};
2266
2267static int qdisc_class_dump(struct Qdisc *q, unsigned long cl,
2268 struct qdisc_walker *arg)
2269{
2270 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
2271
2272 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
2273 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2274 RTM_NEWTCLASS, NULL);
2275}
2276
2277static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
2278 struct tcmsg *tcm, struct netlink_callback *cb,
2279 int *t_p, int s_t)
2280{
2281 struct qdisc_dump_args arg;
2282
2283 if (tc_qdisc_dump_ignore(q, false) ||
2284 *t_p < s_t || !q->ops->cl_ops ||
2285 (tcm->tcm_parent &&
2286 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
2287 (*t_p)++;
2288 return 0;
2289 }
2290 if (*t_p > s_t)
2291 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
2292 arg.w.fn = qdisc_class_dump;
2293 arg.skb = skb;
2294 arg.cb = cb;
2295 arg.w.stop = 0;
2296 arg.w.skip = cb->args[1];
2297 arg.w.count = 0;
2298 q->ops->cl_ops->walk(q, &arg.w);
2299 cb->args[1] = arg.w.count;
2300 if (arg.w.stop)
2301 return -1;
2302 (*t_p)++;
2303 return 0;
2304}
2305
2306static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
2307 struct tcmsg *tcm, struct netlink_callback *cb,
2308 int *t_p, int s_t, bool recur)
2309{
2310 struct Qdisc *q;
2311 int b;
2312
2313 if (!root)
2314 return 0;
2315
2316 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
2317 return -1;
2318
2319 if (!qdisc_dev(root) || !recur)
2320 return 0;
2321
2322 if (tcm->tcm_parent) {
2323 q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent));
2324 if (q && q != root &&
2325 tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
2326 return -1;
2327 return 0;
2328 }
2329 hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
2330 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
2331 return -1;
2332 }
2333
2334 return 0;
2335}
2336
2337static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
2338{
2339 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2340 struct net *net = sock_net(skb->sk);
2341 struct netdev_queue *dev_queue;
2342 struct net_device *dev;
2343 int t, s_t;
2344
2345 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2346 return 0;
2347 dev = dev_get_by_index(net, tcm->tcm_ifindex);
2348 if (!dev)
2349 return 0;
2350
2351 s_t = cb->args[0];
2352 t = 0;
2353
2354 if (tc_dump_tclass_root(rtnl_dereference(dev->qdisc),
2355 skb, tcm, cb, &t, s_t, true) < 0)
2356 goto done;
2357
2358 dev_queue = dev_ingress_queue(dev);
2359 if (dev_queue &&
2360 tc_dump_tclass_root(rtnl_dereference(dev_queue->qdisc_sleeping),
2361 skb, tcm, cb, &t, s_t, false) < 0)
2362 goto done;
2363
2364done:
2365 cb->args[0] = t;
2366
2367 dev_put(dev);
2368 return skb->len;
2369}
2370
2371#ifdef CONFIG_PROC_FS
2372static int psched_show(struct seq_file *seq, void *v)
2373{
2374 seq_printf(seq, "%08x %08x %08x %08x\n",
2375 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
2376 1000000,
2377 (u32)NSEC_PER_SEC / hrtimer_resolution);
2378
2379 return 0;
2380}
2381
2382static int __net_init psched_net_init(struct net *net)
2383{
2384 struct proc_dir_entry *e;
2385
2386 e = proc_create_single("psched", 0, net->proc_net, psched_show);
2387 if (e == NULL)
2388 return -ENOMEM;
2389
2390 return 0;
2391}
2392
2393static void __net_exit psched_net_exit(struct net *net)
2394{
2395 remove_proc_entry("psched", net->proc_net);
2396}
2397#else
2398static int __net_init psched_net_init(struct net *net)
2399{
2400 return 0;
2401}
2402
2403static void __net_exit psched_net_exit(struct net *net)
2404{
2405}
2406#endif
2407
2408static struct pernet_operations psched_net_ops = {
2409 .init = psched_net_init,
2410 .exit = psched_net_exit,
2411};
2412
2413#if IS_ENABLED(CONFIG_RETPOLINE)
2414DEFINE_STATIC_KEY_FALSE(tc_skip_wrapper);
2415#endif
2416
2417static int __init pktsched_init(void)
2418{
2419 int err;
2420
2421 err = register_pernet_subsys(&psched_net_ops);
2422 if (err) {
2423 pr_err("pktsched_init: "
2424 "cannot initialize per netns operations\n");
2425 return err;
2426 }
2427
2428 register_qdisc(&pfifo_fast_ops);
2429 register_qdisc(&pfifo_qdisc_ops);
2430 register_qdisc(&bfifo_qdisc_ops);
2431 register_qdisc(&pfifo_head_drop_qdisc_ops);
2432 register_qdisc(&mq_qdisc_ops);
2433 register_qdisc(&noqueue_qdisc_ops);
2434
2435 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0);
2436 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0);
2437 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc,
2438 0);
2439 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0);
2440 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0);
2441 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass,
2442 0);
2443
2444 tc_wrapper_init();
2445
2446 return 0;
2447}
2448
2449subsys_initcall(pktsched_init);