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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 if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
430 goto nla_put_failure;
431 nla_nest_end(skb, nest);
432
433 return skb->len;
434
435nla_put_failure:
436 return -1;
437}
438
439void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab)
440{
441 int pkt_len, slot;
442
443 pkt_len = skb->len + stab->szopts.overhead;
444 if (unlikely(!stab->szopts.tsize))
445 goto out;
446
447 slot = pkt_len + stab->szopts.cell_align;
448 if (unlikely(slot < 0))
449 slot = 0;
450
451 slot >>= stab->szopts.cell_log;
452 if (likely(slot < stab->szopts.tsize))
453 pkt_len = stab->data[slot];
454 else
455 pkt_len = stab->data[stab->szopts.tsize - 1] *
456 (slot / stab->szopts.tsize) +
457 stab->data[slot % stab->szopts.tsize];
458
459 pkt_len <<= stab->szopts.size_log;
460out:
461 if (unlikely(pkt_len < 1))
462 pkt_len = 1;
463 qdisc_skb_cb(skb)->pkt_len = pkt_len;
464}
465EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
466
467void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc)
468{
469 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
470 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
471 txt, qdisc->ops->id, qdisc->handle >> 16);
472 qdisc->flags |= TCQ_F_WARN_NONWC;
473 }
474}
475EXPORT_SYMBOL(qdisc_warn_nonwc);
476
477static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
478{
479 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
480 timer);
481
482 qdisc_unthrottled(wd->qdisc);
483 __netif_schedule(qdisc_root(wd->qdisc));
484
485 return HRTIMER_NORESTART;
486}
487
488void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
489{
490 hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
491 wd->timer.function = qdisc_watchdog;
492 wd->qdisc = qdisc;
493}
494EXPORT_SYMBOL(qdisc_watchdog_init);
495
496void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires)
497{
498 ktime_t time;
499
500 if (test_bit(__QDISC_STATE_DEACTIVATED,
501 &qdisc_root_sleeping(wd->qdisc)->state))
502 return;
503
504 qdisc_throttled(wd->qdisc);
505 time = ktime_set(0, 0);
506 time = ktime_add_ns(time, PSCHED_TICKS2NS(expires));
507 hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS);
508}
509EXPORT_SYMBOL(qdisc_watchdog_schedule);
510
511void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
512{
513 hrtimer_cancel(&wd->timer);
514 qdisc_unthrottled(wd->qdisc);
515}
516EXPORT_SYMBOL(qdisc_watchdog_cancel);
517
518static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
519{
520 unsigned int size = n * sizeof(struct hlist_head), i;
521 struct hlist_head *h;
522
523 if (size <= PAGE_SIZE)
524 h = kmalloc(size, GFP_KERNEL);
525 else
526 h = (struct hlist_head *)
527 __get_free_pages(GFP_KERNEL, get_order(size));
528
529 if (h != NULL) {
530 for (i = 0; i < n; i++)
531 INIT_HLIST_HEAD(&h[i]);
532 }
533 return h;
534}
535
536static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n)
537{
538 unsigned int size = n * sizeof(struct hlist_head);
539
540 if (size <= PAGE_SIZE)
541 kfree(h);
542 else
543 free_pages((unsigned long)h, get_order(size));
544}
545
546void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
547{
548 struct Qdisc_class_common *cl;
549 struct hlist_node *n, *next;
550 struct hlist_head *nhash, *ohash;
551 unsigned int nsize, nmask, osize;
552 unsigned int i, h;
553
554 /* Rehash when load factor exceeds 0.75 */
555 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
556 return;
557 nsize = clhash->hashsize * 2;
558 nmask = nsize - 1;
559 nhash = qdisc_class_hash_alloc(nsize);
560 if (nhash == NULL)
561 return;
562
563 ohash = clhash->hash;
564 osize = clhash->hashsize;
565
566 sch_tree_lock(sch);
567 for (i = 0; i < osize; i++) {
568 hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) {
569 h = qdisc_class_hash(cl->classid, nmask);
570 hlist_add_head(&cl->hnode, &nhash[h]);
571 }
572 }
573 clhash->hash = nhash;
574 clhash->hashsize = nsize;
575 clhash->hashmask = nmask;
576 sch_tree_unlock(sch);
577
578 qdisc_class_hash_free(ohash, osize);
579}
580EXPORT_SYMBOL(qdisc_class_hash_grow);
581
582int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
583{
584 unsigned int size = 4;
585
586 clhash->hash = qdisc_class_hash_alloc(size);
587 if (clhash->hash == NULL)
588 return -ENOMEM;
589 clhash->hashsize = size;
590 clhash->hashmask = size - 1;
591 clhash->hashelems = 0;
592 return 0;
593}
594EXPORT_SYMBOL(qdisc_class_hash_init);
595
596void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
597{
598 qdisc_class_hash_free(clhash->hash, clhash->hashsize);
599}
600EXPORT_SYMBOL(qdisc_class_hash_destroy);
601
602void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
603 struct Qdisc_class_common *cl)
604{
605 unsigned int h;
606
607 INIT_HLIST_NODE(&cl->hnode);
608 h = qdisc_class_hash(cl->classid, clhash->hashmask);
609 hlist_add_head(&cl->hnode, &clhash->hash[h]);
610 clhash->hashelems++;
611}
612EXPORT_SYMBOL(qdisc_class_hash_insert);
613
614void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
615 struct Qdisc_class_common *cl)
616{
617 hlist_del(&cl->hnode);
618 clhash->hashelems--;
619}
620EXPORT_SYMBOL(qdisc_class_hash_remove);
621
622/* Allocate an unique handle from space managed by kernel
623 * Possible range is [8000-FFFF]:0000 (0x8000 values)
624 */
625static u32 qdisc_alloc_handle(struct net_device *dev)
626{
627 int i = 0x8000;
628 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
629
630 do {
631 autohandle += TC_H_MAKE(0x10000U, 0);
632 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
633 autohandle = TC_H_MAKE(0x80000000U, 0);
634 if (!qdisc_lookup(dev, autohandle))
635 return autohandle;
636 cond_resched();
637 } while (--i > 0);
638
639 return 0;
640}
641
642void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
643{
644 const struct Qdisc_class_ops *cops;
645 unsigned long cl;
646 u32 parentid;
647
648 if (n == 0)
649 return;
650 while ((parentid = sch->parent)) {
651 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
652 return;
653
654 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
655 if (sch == NULL) {
656 WARN_ON(parentid != TC_H_ROOT);
657 return;
658 }
659 cops = sch->ops->cl_ops;
660 if (cops->qlen_notify) {
661 cl = cops->get(sch, parentid);
662 cops->qlen_notify(sch, cl);
663 cops->put(sch, cl);
664 }
665 sch->q.qlen -= n;
666 }
667}
668EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
669
670static void notify_and_destroy(struct net *net, struct sk_buff *skb,
671 struct nlmsghdr *n, u32 clid,
672 struct Qdisc *old, struct Qdisc *new)
673{
674 if (new || old)
675 qdisc_notify(net, skb, n, clid, old, new);
676
677 if (old)
678 qdisc_destroy(old);
679}
680
681/* Graft qdisc "new" to class "classid" of qdisc "parent" or
682 * to device "dev".
683 *
684 * When appropriate send a netlink notification using 'skb'
685 * and "n".
686 *
687 * On success, destroy old qdisc.
688 */
689
690static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
691 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
692 struct Qdisc *new, struct Qdisc *old)
693{
694 struct Qdisc *q = old;
695 struct net *net = dev_net(dev);
696 int err = 0;
697
698 if (parent == NULL) {
699 unsigned int i, num_q, ingress;
700
701 ingress = 0;
702 num_q = dev->num_tx_queues;
703 if ((q && q->flags & TCQ_F_INGRESS) ||
704 (new && new->flags & TCQ_F_INGRESS)) {
705 num_q = 1;
706 ingress = 1;
707 if (!dev_ingress_queue(dev))
708 return -ENOENT;
709 }
710
711 if (dev->flags & IFF_UP)
712 dev_deactivate(dev);
713
714 if (new && new->ops->attach) {
715 new->ops->attach(new);
716 num_q = 0;
717 }
718
719 for (i = 0; i < num_q; i++) {
720 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
721
722 if (!ingress)
723 dev_queue = netdev_get_tx_queue(dev, i);
724
725 old = dev_graft_qdisc(dev_queue, new);
726 if (new && i > 0)
727 atomic_inc(&new->refcnt);
728
729 if (!ingress)
730 qdisc_destroy(old);
731 }
732
733 if (!ingress) {
734 notify_and_destroy(net, skb, n, classid,
735 dev->qdisc, new);
736 if (new && !new->ops->attach)
737 atomic_inc(&new->refcnt);
738 dev->qdisc = new ? : &noop_qdisc;
739 } else {
740 notify_and_destroy(net, skb, n, classid, old, new);
741 }
742
743 if (dev->flags & IFF_UP)
744 dev_activate(dev);
745 } else {
746 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
747
748 err = -EOPNOTSUPP;
749 if (cops && cops->graft) {
750 unsigned long cl = cops->get(parent, classid);
751 if (cl) {
752 err = cops->graft(parent, cl, new, &old);
753 cops->put(parent, cl);
754 } else
755 err = -ENOENT;
756 }
757 if (!err)
758 notify_and_destroy(net, skb, n, classid, old, new);
759 }
760 return err;
761}
762
763/* lockdep annotation is needed for ingress; egress gets it only for name */
764static struct lock_class_key qdisc_tx_lock;
765static struct lock_class_key qdisc_rx_lock;
766
767/*
768 Allocate and initialize new qdisc.
769
770 Parameters are passed via opt.
771 */
772
773static struct Qdisc *
774qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
775 struct Qdisc *p, u32 parent, u32 handle,
776 struct nlattr **tca, int *errp)
777{
778 int err;
779 struct nlattr *kind = tca[TCA_KIND];
780 struct Qdisc *sch;
781 struct Qdisc_ops *ops;
782 struct qdisc_size_table *stab;
783
784 ops = qdisc_lookup_ops(kind);
785#ifdef CONFIG_MODULES
786 if (ops == NULL && kind != NULL) {
787 char name[IFNAMSIZ];
788 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
789 /* We dropped the RTNL semaphore in order to
790 * perform the module load. So, even if we
791 * succeeded in loading the module we have to
792 * tell the caller to replay the request. We
793 * indicate this using -EAGAIN.
794 * We replay the request because the device may
795 * go away in the mean time.
796 */
797 rtnl_unlock();
798 request_module("sch_%s", name);
799 rtnl_lock();
800 ops = qdisc_lookup_ops(kind);
801 if (ops != NULL) {
802 /* We will try again qdisc_lookup_ops,
803 * so don't keep a reference.
804 */
805 module_put(ops->owner);
806 err = -EAGAIN;
807 goto err_out;
808 }
809 }
810 }
811#endif
812
813 err = -ENOENT;
814 if (ops == NULL)
815 goto err_out;
816
817 sch = qdisc_alloc(dev_queue, ops);
818 if (IS_ERR(sch)) {
819 err = PTR_ERR(sch);
820 goto err_out2;
821 }
822
823 sch->parent = parent;
824
825 if (handle == TC_H_INGRESS) {
826 sch->flags |= TCQ_F_INGRESS;
827 handle = TC_H_MAKE(TC_H_INGRESS, 0);
828 lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
829 } else {
830 if (handle == 0) {
831 handle = qdisc_alloc_handle(dev);
832 err = -ENOMEM;
833 if (handle == 0)
834 goto err_out3;
835 }
836 lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
837 }
838
839 sch->handle = handle;
840
841 if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
842 if (tca[TCA_STAB]) {
843 stab = qdisc_get_stab(tca[TCA_STAB]);
844 if (IS_ERR(stab)) {
845 err = PTR_ERR(stab);
846 goto err_out4;
847 }
848 rcu_assign_pointer(sch->stab, stab);
849 }
850 if (tca[TCA_RATE]) {
851 spinlock_t *root_lock;
852
853 err = -EOPNOTSUPP;
854 if (sch->flags & TCQ_F_MQROOT)
855 goto err_out4;
856
857 if ((sch->parent != TC_H_ROOT) &&
858 !(sch->flags & TCQ_F_INGRESS) &&
859 (!p || !(p->flags & TCQ_F_MQROOT)))
860 root_lock = qdisc_root_sleeping_lock(sch);
861 else
862 root_lock = qdisc_lock(sch);
863
864 err = gen_new_estimator(&sch->bstats, &sch->rate_est,
865 root_lock, tca[TCA_RATE]);
866 if (err)
867 goto err_out4;
868 }
869
870 qdisc_list_add(sch);
871
872 return sch;
873 }
874err_out3:
875 dev_put(dev);
876 kfree((char *) sch - sch->padded);
877err_out2:
878 module_put(ops->owner);
879err_out:
880 *errp = err;
881 return NULL;
882
883err_out4:
884 /*
885 * Any broken qdiscs that would require a ops->reset() here?
886 * The qdisc was never in action so it shouldn't be necessary.
887 */
888 qdisc_put_stab(rtnl_dereference(sch->stab));
889 if (ops->destroy)
890 ops->destroy(sch);
891 goto err_out3;
892}
893
894static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
895{
896 struct qdisc_size_table *ostab, *stab = NULL;
897 int err = 0;
898
899 if (tca[TCA_OPTIONS]) {
900 if (sch->ops->change == NULL)
901 return -EINVAL;
902 err = sch->ops->change(sch, tca[TCA_OPTIONS]);
903 if (err)
904 return err;
905 }
906
907 if (tca[TCA_STAB]) {
908 stab = qdisc_get_stab(tca[TCA_STAB]);
909 if (IS_ERR(stab))
910 return PTR_ERR(stab);
911 }
912
913 ostab = rtnl_dereference(sch->stab);
914 rcu_assign_pointer(sch->stab, stab);
915 qdisc_put_stab(ostab);
916
917 if (tca[TCA_RATE]) {
918 /* NB: ignores errors from replace_estimator
919 because change can't be undone. */
920 if (sch->flags & TCQ_F_MQROOT)
921 goto out;
922 gen_replace_estimator(&sch->bstats, &sch->rate_est,
923 qdisc_root_sleeping_lock(sch),
924 tca[TCA_RATE]);
925 }
926out:
927 return 0;
928}
929
930struct check_loop_arg {
931 struct qdisc_walker w;
932 struct Qdisc *p;
933 int depth;
934};
935
936static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w);
937
938static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
939{
940 struct check_loop_arg arg;
941
942 if (q->ops->cl_ops == NULL)
943 return 0;
944
945 arg.w.stop = arg.w.skip = arg.w.count = 0;
946 arg.w.fn = check_loop_fn;
947 arg.depth = depth;
948 arg.p = p;
949 q->ops->cl_ops->walk(q, &arg.w);
950 return arg.w.stop ? -ELOOP : 0;
951}
952
953static int
954check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
955{
956 struct Qdisc *leaf;
957 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
958 struct check_loop_arg *arg = (struct check_loop_arg *)w;
959
960 leaf = cops->leaf(q, cl);
961 if (leaf) {
962 if (leaf == arg->p || arg->depth > 7)
963 return -ELOOP;
964 return check_loop(leaf, arg->p, arg->depth + 1);
965 }
966 return 0;
967}
968
969/*
970 * Delete/get qdisc.
971 */
972
973static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
974{
975 struct net *net = sock_net(skb->sk);
976 struct tcmsg *tcm = NLMSG_DATA(n);
977 struct nlattr *tca[TCA_MAX + 1];
978 struct net_device *dev;
979 u32 clid = tcm->tcm_parent;
980 struct Qdisc *q = NULL;
981 struct Qdisc *p = NULL;
982 int err;
983
984 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
985 if (!dev)
986 return -ENODEV;
987
988 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
989 if (err < 0)
990 return err;
991
992 if (clid) {
993 if (clid != TC_H_ROOT) {
994 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
995 p = qdisc_lookup(dev, TC_H_MAJ(clid));
996 if (!p)
997 return -ENOENT;
998 q = qdisc_leaf(p, clid);
999 } else if (dev_ingress_queue(dev)) {
1000 q = dev_ingress_queue(dev)->qdisc_sleeping;
1001 }
1002 } else {
1003 q = dev->qdisc;
1004 }
1005 if (!q)
1006 return -ENOENT;
1007
1008 if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
1009 return -EINVAL;
1010 } else {
1011 q = qdisc_lookup(dev, tcm->tcm_handle);
1012 if (!q)
1013 return -ENOENT;
1014 }
1015
1016 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1017 return -EINVAL;
1018
1019 if (n->nlmsg_type == RTM_DELQDISC) {
1020 if (!clid)
1021 return -EINVAL;
1022 if (q->handle == 0)
1023 return -ENOENT;
1024 err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
1025 if (err != 0)
1026 return err;
1027 } else {
1028 qdisc_notify(net, skb, n, clid, NULL, q);
1029 }
1030 return 0;
1031}
1032
1033/*
1034 * Create/change qdisc.
1035 */
1036
1037static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
1038{
1039 struct net *net = sock_net(skb->sk);
1040 struct tcmsg *tcm;
1041 struct nlattr *tca[TCA_MAX + 1];
1042 struct net_device *dev;
1043 u32 clid;
1044 struct Qdisc *q, *p;
1045 int err;
1046
1047replay:
1048 /* Reinit, just in case something touches this. */
1049 tcm = NLMSG_DATA(n);
1050 clid = tcm->tcm_parent;
1051 q = p = NULL;
1052
1053 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1054 if (!dev)
1055 return -ENODEV;
1056
1057 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1058 if (err < 0)
1059 return err;
1060
1061 if (clid) {
1062 if (clid != TC_H_ROOT) {
1063 if (clid != TC_H_INGRESS) {
1064 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1065 if (!p)
1066 return -ENOENT;
1067 q = qdisc_leaf(p, clid);
1068 } else if (dev_ingress_queue_create(dev)) {
1069 q = dev_ingress_queue(dev)->qdisc_sleeping;
1070 }
1071 } else {
1072 q = dev->qdisc;
1073 }
1074
1075 /* It may be default qdisc, ignore it */
1076 if (q && q->handle == 0)
1077 q = NULL;
1078
1079 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1080 if (tcm->tcm_handle) {
1081 if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
1082 return -EEXIST;
1083 if (TC_H_MIN(tcm->tcm_handle))
1084 return -EINVAL;
1085 q = qdisc_lookup(dev, tcm->tcm_handle);
1086 if (!q)
1087 goto create_n_graft;
1088 if (n->nlmsg_flags & NLM_F_EXCL)
1089 return -EEXIST;
1090 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1091 return -EINVAL;
1092 if (q == p ||
1093 (p && check_loop(q, p, 0)))
1094 return -ELOOP;
1095 atomic_inc(&q->refcnt);
1096 goto graft;
1097 } else {
1098 if (!q)
1099 goto create_n_graft;
1100
1101 /* This magic test requires explanation.
1102 *
1103 * We know, that some child q is already
1104 * attached to this parent and have choice:
1105 * either to change it or to create/graft new one.
1106 *
1107 * 1. We are allowed to create/graft only
1108 * if CREATE and REPLACE flags are set.
1109 *
1110 * 2. If EXCL is set, requestor wanted to say,
1111 * that qdisc tcm_handle is not expected
1112 * to exist, so that we choose create/graft too.
1113 *
1114 * 3. The last case is when no flags are set.
1115 * Alas, it is sort of hole in API, we
1116 * cannot decide what to do unambiguously.
1117 * For now we select create/graft, if
1118 * user gave KIND, which does not match existing.
1119 */
1120 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1121 (n->nlmsg_flags & NLM_F_REPLACE) &&
1122 ((n->nlmsg_flags & NLM_F_EXCL) ||
1123 (tca[TCA_KIND] &&
1124 nla_strcmp(tca[TCA_KIND], q->ops->id))))
1125 goto create_n_graft;
1126 }
1127 }
1128 } else {
1129 if (!tcm->tcm_handle)
1130 return -EINVAL;
1131 q = qdisc_lookup(dev, tcm->tcm_handle);
1132 }
1133
1134 /* Change qdisc parameters */
1135 if (q == NULL)
1136 return -ENOENT;
1137 if (n->nlmsg_flags & NLM_F_EXCL)
1138 return -EEXIST;
1139 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
1140 return -EINVAL;
1141 err = qdisc_change(q, tca);
1142 if (err == 0)
1143 qdisc_notify(net, skb, n, clid, NULL, q);
1144 return err;
1145
1146create_n_graft:
1147 if (!(n->nlmsg_flags & NLM_F_CREATE))
1148 return -ENOENT;
1149 if (clid == TC_H_INGRESS) {
1150 if (dev_ingress_queue(dev))
1151 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1152 tcm->tcm_parent, tcm->tcm_parent,
1153 tca, &err);
1154 else
1155 err = -ENOENT;
1156 } else {
1157 struct netdev_queue *dev_queue;
1158
1159 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1160 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1161 else if (p)
1162 dev_queue = p->dev_queue;
1163 else
1164 dev_queue = netdev_get_tx_queue(dev, 0);
1165
1166 q = qdisc_create(dev, dev_queue, p,
1167 tcm->tcm_parent, tcm->tcm_handle,
1168 tca, &err);
1169 }
1170 if (q == NULL) {
1171 if (err == -EAGAIN)
1172 goto replay;
1173 return err;
1174 }
1175
1176graft:
1177 err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
1178 if (err) {
1179 if (q)
1180 qdisc_destroy(q);
1181 return err;
1182 }
1183
1184 return 0;
1185}
1186
1187static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
1188 u32 pid, u32 seq, u16 flags, int event)
1189{
1190 struct tcmsg *tcm;
1191 struct nlmsghdr *nlh;
1192 unsigned char *b = skb_tail_pointer(skb);
1193 struct gnet_dump d;
1194 struct qdisc_size_table *stab;
1195
1196 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
1197 tcm = NLMSG_DATA(nlh);
1198 tcm->tcm_family = AF_UNSPEC;
1199 tcm->tcm__pad1 = 0;
1200 tcm->tcm__pad2 = 0;
1201 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1202 tcm->tcm_parent = clid;
1203 tcm->tcm_handle = q->handle;
1204 tcm->tcm_info = atomic_read(&q->refcnt);
1205 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1206 goto nla_put_failure;
1207 if (q->ops->dump && q->ops->dump(q, skb) < 0)
1208 goto nla_put_failure;
1209 q->qstats.qlen = q->q.qlen;
1210
1211 stab = rtnl_dereference(q->stab);
1212 if (stab && qdisc_dump_stab(skb, stab) < 0)
1213 goto nla_put_failure;
1214
1215 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1216 qdisc_root_sleeping_lock(q), &d) < 0)
1217 goto nla_put_failure;
1218
1219 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
1220 goto nla_put_failure;
1221
1222 if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
1223 gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
1224 gnet_stats_copy_queue(&d, &q->qstats) < 0)
1225 goto nla_put_failure;
1226
1227 if (gnet_stats_finish_copy(&d) < 0)
1228 goto nla_put_failure;
1229
1230 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1231 return skb->len;
1232
1233nlmsg_failure:
1234nla_put_failure:
1235 nlmsg_trim(skb, b);
1236 return -1;
1237}
1238
1239static bool tc_qdisc_dump_ignore(struct Qdisc *q)
1240{
1241 return (q->flags & TCQ_F_BUILTIN) ? true : false;
1242}
1243
1244static int qdisc_notify(struct net *net, struct sk_buff *oskb,
1245 struct nlmsghdr *n, u32 clid,
1246 struct Qdisc *old, struct Qdisc *new)
1247{
1248 struct sk_buff *skb;
1249 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
1250
1251 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1252 if (!skb)
1253 return -ENOBUFS;
1254
1255 if (old && !tc_qdisc_dump_ignore(old)) {
1256 if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq,
1257 0, RTM_DELQDISC) < 0)
1258 goto err_out;
1259 }
1260 if (new && !tc_qdisc_dump_ignore(new)) {
1261 if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq,
1262 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
1263 goto err_out;
1264 }
1265
1266 if (skb->len)
1267 return rtnetlink_send(skb, net, pid, RTNLGRP_TC,
1268 n->nlmsg_flags & NLM_F_ECHO);
1269
1270err_out:
1271 kfree_skb(skb);
1272 return -EINVAL;
1273}
1274
1275static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1276 struct netlink_callback *cb,
1277 int *q_idx_p, int s_q_idx)
1278{
1279 int ret = 0, q_idx = *q_idx_p;
1280 struct Qdisc *q;
1281
1282 if (!root)
1283 return 0;
1284
1285 q = root;
1286 if (q_idx < s_q_idx) {
1287 q_idx++;
1288 } else {
1289 if (!tc_qdisc_dump_ignore(q) &&
1290 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid,
1291 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1292 goto done;
1293 q_idx++;
1294 }
1295 list_for_each_entry(q, &root->list, list) {
1296 if (q_idx < s_q_idx) {
1297 q_idx++;
1298 continue;
1299 }
1300 if (!tc_qdisc_dump_ignore(q) &&
1301 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid,
1302 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1303 goto done;
1304 q_idx++;
1305 }
1306
1307out:
1308 *q_idx_p = q_idx;
1309 return ret;
1310done:
1311 ret = -1;
1312 goto out;
1313}
1314
1315static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1316{
1317 struct net *net = sock_net(skb->sk);
1318 int idx, q_idx;
1319 int s_idx, s_q_idx;
1320 struct net_device *dev;
1321
1322 s_idx = cb->args[0];
1323 s_q_idx = q_idx = cb->args[1];
1324
1325 rcu_read_lock();
1326 idx = 0;
1327 for_each_netdev_rcu(net, dev) {
1328 struct netdev_queue *dev_queue;
1329
1330 if (idx < s_idx)
1331 goto cont;
1332 if (idx > s_idx)
1333 s_q_idx = 0;
1334 q_idx = 0;
1335
1336 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0)
1337 goto done;
1338
1339 dev_queue = dev_ingress_queue(dev);
1340 if (dev_queue &&
1341 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1342 &q_idx, s_q_idx) < 0)
1343 goto done;
1344
1345cont:
1346 idx++;
1347 }
1348
1349done:
1350 rcu_read_unlock();
1351
1352 cb->args[0] = idx;
1353 cb->args[1] = q_idx;
1354
1355 return skb->len;
1356}
1357
1358
1359
1360/************************************************
1361 * Traffic classes manipulation. *
1362 ************************************************/
1363
1364
1365
1366static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
1367{
1368 struct net *net = sock_net(skb->sk);
1369 struct tcmsg *tcm = NLMSG_DATA(n);
1370 struct nlattr *tca[TCA_MAX + 1];
1371 struct net_device *dev;
1372 struct Qdisc *q = NULL;
1373 const struct Qdisc_class_ops *cops;
1374 unsigned long cl = 0;
1375 unsigned long new_cl;
1376 u32 pid = tcm->tcm_parent;
1377 u32 clid = tcm->tcm_handle;
1378 u32 qid = TC_H_MAJ(clid);
1379 int err;
1380
1381 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1382 if (!dev)
1383 return -ENODEV;
1384
1385 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1386 if (err < 0)
1387 return err;
1388
1389 /*
1390 parent == TC_H_UNSPEC - unspecified parent.
1391 parent == TC_H_ROOT - class is root, which has no parent.
1392 parent == X:0 - parent is root class.
1393 parent == X:Y - parent is a node in hierarchy.
1394 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1395
1396 handle == 0:0 - generate handle from kernel pool.
1397 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1398 handle == X:Y - clear.
1399 handle == X:0 - root class.
1400 */
1401
1402 /* Step 1. Determine qdisc handle X:0 */
1403
1404 if (pid != TC_H_ROOT) {
1405 u32 qid1 = TC_H_MAJ(pid);
1406
1407 if (qid && qid1) {
1408 /* If both majors are known, they must be identical. */
1409 if (qid != qid1)
1410 return -EINVAL;
1411 } else if (qid1) {
1412 qid = qid1;
1413 } else if (qid == 0)
1414 qid = dev->qdisc->handle;
1415
1416 /* Now qid is genuine qdisc handle consistent
1417 * both with parent and child.
1418 *
1419 * TC_H_MAJ(pid) still may be unspecified, complete it now.
1420 */
1421 if (pid)
1422 pid = TC_H_MAKE(qid, pid);
1423 } else {
1424 if (qid == 0)
1425 qid = dev->qdisc->handle;
1426 }
1427
1428 /* OK. Locate qdisc */
1429 q = qdisc_lookup(dev, qid);
1430 if (!q)
1431 return -ENOENT;
1432
1433 /* An check that it supports classes */
1434 cops = q->ops->cl_ops;
1435 if (cops == NULL)
1436 return -EINVAL;
1437
1438 /* Now try to get class */
1439 if (clid == 0) {
1440 if (pid == TC_H_ROOT)
1441 clid = qid;
1442 } else
1443 clid = TC_H_MAKE(qid, clid);
1444
1445 if (clid)
1446 cl = cops->get(q, clid);
1447
1448 if (cl == 0) {
1449 err = -ENOENT;
1450 if (n->nlmsg_type != RTM_NEWTCLASS ||
1451 !(n->nlmsg_flags & NLM_F_CREATE))
1452 goto out;
1453 } else {
1454 switch (n->nlmsg_type) {
1455 case RTM_NEWTCLASS:
1456 err = -EEXIST;
1457 if (n->nlmsg_flags & NLM_F_EXCL)
1458 goto out;
1459 break;
1460 case RTM_DELTCLASS:
1461 err = -EOPNOTSUPP;
1462 if (cops->delete)
1463 err = cops->delete(q, cl);
1464 if (err == 0)
1465 tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS);
1466 goto out;
1467 case RTM_GETTCLASS:
1468 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
1469 goto out;
1470 default:
1471 err = -EINVAL;
1472 goto out;
1473 }
1474 }
1475
1476 new_cl = cl;
1477 err = -EOPNOTSUPP;
1478 if (cops->change)
1479 err = cops->change(q, clid, pid, tca, &new_cl);
1480 if (err == 0)
1481 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
1482
1483out:
1484 if (cl)
1485 cops->put(q, cl);
1486
1487 return err;
1488}
1489
1490
1491static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1492 unsigned long cl,
1493 u32 pid, u32 seq, u16 flags, int event)
1494{
1495 struct tcmsg *tcm;
1496 struct nlmsghdr *nlh;
1497 unsigned char *b = skb_tail_pointer(skb);
1498 struct gnet_dump d;
1499 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1500
1501 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
1502 tcm = NLMSG_DATA(nlh);
1503 tcm->tcm_family = AF_UNSPEC;
1504 tcm->tcm__pad1 = 0;
1505 tcm->tcm__pad2 = 0;
1506 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1507 tcm->tcm_parent = q->handle;
1508 tcm->tcm_handle = q->handle;
1509 tcm->tcm_info = 0;
1510 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1511 goto nla_put_failure;
1512 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1513 goto nla_put_failure;
1514
1515 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1516 qdisc_root_sleeping_lock(q), &d) < 0)
1517 goto nla_put_failure;
1518
1519 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1520 goto nla_put_failure;
1521
1522 if (gnet_stats_finish_copy(&d) < 0)
1523 goto nla_put_failure;
1524
1525 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1526 return skb->len;
1527
1528nlmsg_failure:
1529nla_put_failure:
1530 nlmsg_trim(skb, b);
1531 return -1;
1532}
1533
1534static int tclass_notify(struct net *net, struct sk_buff *oskb,
1535 struct nlmsghdr *n, struct Qdisc *q,
1536 unsigned long cl, int event)
1537{
1538 struct sk_buff *skb;
1539 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
1540
1541 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1542 if (!skb)
1543 return -ENOBUFS;
1544
1545 if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) {
1546 kfree_skb(skb);
1547 return -EINVAL;
1548 }
1549
1550 return rtnetlink_send(skb, net, pid, RTNLGRP_TC,
1551 n->nlmsg_flags & NLM_F_ECHO);
1552}
1553
1554struct qdisc_dump_args {
1555 struct qdisc_walker w;
1556 struct sk_buff *skb;
1557 struct netlink_callback *cb;
1558};
1559
1560static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg)
1561{
1562 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
1563
1564 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid,
1565 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS);
1566}
1567
1568static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
1569 struct tcmsg *tcm, struct netlink_callback *cb,
1570 int *t_p, int s_t)
1571{
1572 struct qdisc_dump_args arg;
1573
1574 if (tc_qdisc_dump_ignore(q) ||
1575 *t_p < s_t || !q->ops->cl_ops ||
1576 (tcm->tcm_parent &&
1577 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
1578 (*t_p)++;
1579 return 0;
1580 }
1581 if (*t_p > s_t)
1582 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
1583 arg.w.fn = qdisc_class_dump;
1584 arg.skb = skb;
1585 arg.cb = cb;
1586 arg.w.stop = 0;
1587 arg.w.skip = cb->args[1];
1588 arg.w.count = 0;
1589 q->ops->cl_ops->walk(q, &arg.w);
1590 cb->args[1] = arg.w.count;
1591 if (arg.w.stop)
1592 return -1;
1593 (*t_p)++;
1594 return 0;
1595}
1596
1597static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
1598 struct tcmsg *tcm, struct netlink_callback *cb,
1599 int *t_p, int s_t)
1600{
1601 struct Qdisc *q;
1602
1603 if (!root)
1604 return 0;
1605
1606 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
1607 return -1;
1608
1609 list_for_each_entry(q, &root->list, list) {
1610 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
1611 return -1;
1612 }
1613
1614 return 0;
1615}
1616
1617static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
1618{
1619 struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh);
1620 struct net *net = sock_net(skb->sk);
1621 struct netdev_queue *dev_queue;
1622 struct net_device *dev;
1623 int t, s_t;
1624
1625 if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
1626 return 0;
1627 dev = dev_get_by_index(net, tcm->tcm_ifindex);
1628 if (!dev)
1629 return 0;
1630
1631 s_t = cb->args[0];
1632 t = 0;
1633
1634 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
1635 goto done;
1636
1637 dev_queue = dev_ingress_queue(dev);
1638 if (dev_queue &&
1639 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
1640 &t, s_t) < 0)
1641 goto done;
1642
1643done:
1644 cb->args[0] = t;
1645
1646 dev_put(dev);
1647 return skb->len;
1648}
1649
1650/* Main classifier routine: scans classifier chain attached
1651 * to this qdisc, (optionally) tests for protocol and asks
1652 * specific classifiers.
1653 */
1654int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
1655 struct tcf_result *res)
1656{
1657 __be16 protocol = skb->protocol;
1658 int err;
1659
1660 for (; tp; tp = tp->next) {
1661 if (tp->protocol != protocol &&
1662 tp->protocol != htons(ETH_P_ALL))
1663 continue;
1664 err = tp->classify(skb, tp, res);
1665
1666 if (err >= 0) {
1667#ifdef CONFIG_NET_CLS_ACT
1668 if (err != TC_ACT_RECLASSIFY && skb->tc_verd)
1669 skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0);
1670#endif
1671 return err;
1672 }
1673 }
1674 return -1;
1675}
1676EXPORT_SYMBOL(tc_classify_compat);
1677
1678int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1679 struct tcf_result *res)
1680{
1681 int err = 0;
1682#ifdef CONFIG_NET_CLS_ACT
1683 const struct tcf_proto *otp = tp;
1684reclassify:
1685#endif
1686
1687 err = tc_classify_compat(skb, tp, res);
1688#ifdef CONFIG_NET_CLS_ACT
1689 if (err == TC_ACT_RECLASSIFY) {
1690 u32 verd = G_TC_VERD(skb->tc_verd);
1691 tp = otp;
1692
1693 if (verd++ >= MAX_REC_LOOP) {
1694 net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n",
1695 tp->q->ops->id,
1696 tp->prio & 0xffff,
1697 ntohs(tp->protocol));
1698 return TC_ACT_SHOT;
1699 }
1700 skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd);
1701 goto reclassify;
1702 }
1703#endif
1704 return err;
1705}
1706EXPORT_SYMBOL(tc_classify);
1707
1708void tcf_destroy(struct tcf_proto *tp)
1709{
1710 tp->ops->destroy(tp);
1711 module_put(tp->ops->owner);
1712 kfree(tp);
1713}
1714
1715void tcf_destroy_chain(struct tcf_proto **fl)
1716{
1717 struct tcf_proto *tp;
1718
1719 while ((tp = *fl) != NULL) {
1720 *fl = tp->next;
1721 tcf_destroy(tp);
1722 }
1723}
1724EXPORT_SYMBOL(tcf_destroy_chain);
1725
1726#ifdef CONFIG_PROC_FS
1727static int psched_show(struct seq_file *seq, void *v)
1728{
1729 struct timespec ts;
1730
1731 hrtimer_get_res(CLOCK_MONOTONIC, &ts);
1732 seq_printf(seq, "%08x %08x %08x %08x\n",
1733 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
1734 1000000,
1735 (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts)));
1736
1737 return 0;
1738}
1739
1740static int psched_open(struct inode *inode, struct file *file)
1741{
1742 return single_open(file, psched_show, NULL);
1743}
1744
1745static const struct file_operations psched_fops = {
1746 .owner = THIS_MODULE,
1747 .open = psched_open,
1748 .read = seq_read,
1749 .llseek = seq_lseek,
1750 .release = single_release,
1751};
1752
1753static int __net_init psched_net_init(struct net *net)
1754{
1755 struct proc_dir_entry *e;
1756
1757 e = proc_net_fops_create(net, "psched", 0, &psched_fops);
1758 if (e == NULL)
1759 return -ENOMEM;
1760
1761 return 0;
1762}
1763
1764static void __net_exit psched_net_exit(struct net *net)
1765{
1766 proc_net_remove(net, "psched");
1767}
1768#else
1769static int __net_init psched_net_init(struct net *net)
1770{
1771 return 0;
1772}
1773
1774static void __net_exit psched_net_exit(struct net *net)
1775{
1776}
1777#endif
1778
1779static struct pernet_operations psched_net_ops = {
1780 .init = psched_net_init,
1781 .exit = psched_net_exit,
1782};
1783
1784static int __init pktsched_init(void)
1785{
1786 int err;
1787
1788 err = register_pernet_subsys(&psched_net_ops);
1789 if (err) {
1790 pr_err("pktsched_init: "
1791 "cannot initialize per netns operations\n");
1792 return err;
1793 }
1794
1795 register_qdisc(&pfifo_qdisc_ops);
1796 register_qdisc(&bfifo_qdisc_ops);
1797 register_qdisc(&pfifo_head_drop_qdisc_ops);
1798 register_qdisc(&mq_qdisc_ops);
1799
1800 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
1801 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
1802 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL);
1803 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
1804 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
1805 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL);
1806
1807 return 0;
1808}
1809
1810subsys_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(NET_SCH_ALIAS_PREFIX "%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_rcu(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(NET_SCH_ALIAS_PREFIX "%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_MITIGATION_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);