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Linux 5.7.7
[linux/fpc-iii.git] / net / sched / sch_api.c
blob0d99df1e764db812f5dfc78a9c54832c0f676f70
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/sched/sch_api.c Packet scheduler API.
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 *
7 * Fixes:
8 *
9 * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired.
10 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
11 * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support
12 */
13
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/string.h>
18 #include <linux/errno.h>
19 #include <linux/skbuff.h>
20 #include <linux/init.h>
21 #include <linux/proc_fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/kmod.h>
24 #include <linux/list.h>
25 #include <linux/hrtimer.h>
26 #include <linux/slab.h>
27 #include <linux/hashtable.h>
28
29 #include <net/net_namespace.h>
30 #include <net/sock.h>
31 #include <net/netlink.h>
32 #include <net/pkt_sched.h>
33 #include <net/pkt_cls.h>
34
35 /*
36
37 Short review.
38 -------------
39
40 This file consists of two interrelated parts:
41
42 1. queueing disciplines manager frontend.
43 2. traffic classes manager frontend.
44
45 Generally, queueing discipline ("qdisc") is a black box,
46 which is able to enqueue packets and to dequeue them (when
47 device is ready to send something) in order and at times
48 determined by algorithm hidden in it.
49
50 qdisc's are divided to two categories:
51 - "queues", which have no internal structure visible from outside.
52 - "schedulers", which split all the packets to "traffic classes",
53 using "packet classifiers" (look at cls_api.c)
54
55 In turn, classes may have child qdiscs (as rule, queues)
56 attached to them etc. etc. etc.
57
58 The goal of the routines in this file is to translate
59 information supplied by user in the form of handles
60 to more intelligible for kernel form, to make some sanity
61 checks and part of work, which is common to all qdiscs
62 and to provide rtnetlink notifications.
63
64 All real intelligent work is done inside qdisc modules.
65
66
67
68 Every discipline has two major routines: enqueue and dequeue.
69
70 ---dequeue
71
72 dequeue usually returns a skb to send. It is allowed to return NULL,
73 but it does not mean that queue is empty, it just means that
74 discipline does not want to send anything this time.
75 Queue is really empty if q->q.qlen == 0.
76 For complicated disciplines with multiple queues q->q is not
77 real packet queue, but however q->q.qlen must be valid.
78
79 ---enqueue
80
81 enqueue returns 0, if packet was enqueued successfully.
82 If packet (this one or another one) was dropped, it returns
83 not zero error code.
84 NET_XMIT_DROP - this packet dropped
85 Expected action: do not backoff, but wait until queue will clear.
86 NET_XMIT_CN - probably this packet enqueued, but another one dropped.
87 Expected action: backoff or ignore
88
89 Auxiliary routines:
90
91 ---peek
92
93 like dequeue but without removing a packet from the queue
94
95 ---reset
96
97 returns qdisc to initial state: purge all buffers, clear all
98 timers, counters (except for statistics) etc.
99
100 ---init
101
102 initializes newly created qdisc.
103
104 ---destroy
105
106 destroys resources allocated by init and during lifetime of qdisc.
107
108 ---change
109
110 changes qdisc parameters.
111 */
112
113 /* Protects list of registered TC modules. It is pure SMP lock. */
114 static DEFINE_RWLOCK(qdisc_mod_lock);
115
116
117 /************************************************
118 * Queueing disciplines manipulation. *
119 ************************************************/
120
121
122 /* The list of all installed queueing disciplines. */
123
124 static struct Qdisc_ops *qdisc_base;
125
126 /* Register/unregister queueing discipline */
127
128 int register_qdisc(struct Qdisc_ops *qops)
129 {
130 struct Qdisc_ops *q, **qp;
131 int rc = -EEXIST;
132
133 write_lock(&qdisc_mod_lock);
134 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
135 if (!strcmp(qops->id, q->id))
136 goto out;
137
138 if (qops->enqueue == NULL)
139 qops->enqueue = noop_qdisc_ops.enqueue;
140 if (qops->peek == NULL) {
141 if (qops->dequeue == NULL)
142 qops->peek = noop_qdisc_ops.peek;
143 else
144 goto out_einval;
145 }
146 if (qops->dequeue == NULL)
147 qops->dequeue = noop_qdisc_ops.dequeue;
148
149 if (qops->cl_ops) {
150 const struct Qdisc_class_ops *cops = qops->cl_ops;
151
152 if (!(cops->find && cops->walk && cops->leaf))
153 goto out_einval;
154
155 if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf))
156 goto out_einval;
157 }
158
159 qops->next = NULL;
160 *qp = qops;
161 rc = 0;
162 out:
163 write_unlock(&qdisc_mod_lock);
164 return rc;
165
166 out_einval:
167 rc = -EINVAL;
168 goto out;
169 }
170 EXPORT_SYMBOL(register_qdisc);
171
172 int unregister_qdisc(struct Qdisc_ops *qops)
173 {
174 struct Qdisc_ops *q, **qp;
175 int err = -ENOENT;
176
177 write_lock(&qdisc_mod_lock);
178 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
179 if (q == qops)
180 break;
181 if (q) {
182 *qp = q->next;
183 q->next = NULL;
184 err = 0;
185 }
186 write_unlock(&qdisc_mod_lock);
187 return err;
188 }
189 EXPORT_SYMBOL(unregister_qdisc);
190
191 /* Get default qdisc if not otherwise specified */
192 void qdisc_get_default(char *name, size_t len)
193 {
194 read_lock(&qdisc_mod_lock);
195 strlcpy(name, default_qdisc_ops->id, len);
196 read_unlock(&qdisc_mod_lock);
197 }
198
199 static struct Qdisc_ops *qdisc_lookup_default(const char *name)
200 {
201 struct Qdisc_ops *q = NULL;
202
203 for (q = qdisc_base; q; q = q->next) {
204 if (!strcmp(name, q->id)) {
205 if (!try_module_get(q->owner))
206 q = NULL;
207 break;
208 }
209 }
210
211 return q;
212 }
213
214 /* Set new default qdisc to use */
215 int qdisc_set_default(const char *name)
216 {
217 const struct Qdisc_ops *ops;
218
219 if (!capable(CAP_NET_ADMIN))
220 return -EPERM;
221
222 write_lock(&qdisc_mod_lock);
223 ops = qdisc_lookup_default(name);
224 if (!ops) {
225 /* Not found, drop lock and try to load module */
226 write_unlock(&qdisc_mod_lock);
227 request_module("sch_%s", name);
228 write_lock(&qdisc_mod_lock);
229
230 ops = qdisc_lookup_default(name);
231 }
232
233 if (ops) {
234 /* Set new default */
235 module_put(default_qdisc_ops->owner);
236 default_qdisc_ops = ops;
237 }
238 write_unlock(&qdisc_mod_lock);
239
240 return ops ? 0 : -ENOENT;
241 }
242
243 #ifdef CONFIG_NET_SCH_DEFAULT
244 /* Set default value from kernel config */
245 static int __init sch_default_qdisc(void)
246 {
247 return qdisc_set_default(CONFIG_DEFAULT_NET_SCH);
248 }
249 late_initcall(sch_default_qdisc);
250 #endif
251
252 /* We know handle. Find qdisc among all qdisc's attached to device
253 * (root qdisc, all its children, children of children etc.)
254 * Note: caller either uses rtnl or rcu_read_lock()
255 */
256
257 static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
258 {
259 struct Qdisc *q;
260
261 if (!qdisc_dev(root))
262 return (root->handle == handle ? root : NULL);
263
264 if (!(root->flags & TCQ_F_BUILTIN) &&
265 root->handle == handle)
266 return root;
267
268 hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) {
269 if (q->handle == handle)
270 return q;
271 }
272 return NULL;
273 }
274
275 void qdisc_hash_add(struct Qdisc *q, bool invisible)
276 {
277 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
278 ASSERT_RTNL();
279 hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle);
280 if (invisible)
281 q->flags |= TCQ_F_INVISIBLE;
282 }
283 }
284 EXPORT_SYMBOL(qdisc_hash_add);
285
286 void qdisc_hash_del(struct Qdisc *q)
287 {
288 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
289 ASSERT_RTNL();
290 hash_del_rcu(&q->hash);
291 }
292 }
293 EXPORT_SYMBOL(qdisc_hash_del);
294
295 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
296 {
297 struct Qdisc *q;
298
299 if (!handle)
300 return NULL;
301 q = qdisc_match_from_root(dev->qdisc, handle);
302 if (q)
303 goto out;
304
305 if (dev_ingress_queue(dev))
306 q = qdisc_match_from_root(
307 dev_ingress_queue(dev)->qdisc_sleeping,
308 handle);
309 out:
310 return q;
311 }
312
313 struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle)
314 {
315 struct netdev_queue *nq;
316 struct Qdisc *q;
317
318 if (!handle)
319 return NULL;
320 q = qdisc_match_from_root(dev->qdisc, handle);
321 if (q)
322 goto out;
323
324 nq = dev_ingress_queue_rcu(dev);
325 if (nq)
326 q = qdisc_match_from_root(nq->qdisc_sleeping, handle);
327 out:
328 return q;
329 }
330
331 static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
332 {
333 unsigned long cl;
334 const struct Qdisc_class_ops *cops = p->ops->cl_ops;
335
336 if (cops == NULL)
337 return NULL;
338 cl = cops->find(p, classid);
339
340 if (cl == 0)
341 return NULL;
342 return cops->leaf(p, cl);
343 }
344
345 /* Find queueing discipline by name */
346
347 static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
348 {
349 struct Qdisc_ops *q = NULL;
350
351 if (kind) {
352 read_lock(&qdisc_mod_lock);
353 for (q = qdisc_base; q; q = q->next) {
354 if (nla_strcmp(kind, q->id) == 0) {
355 if (!try_module_get(q->owner))
356 q = NULL;
357 break;
358 }
359 }
360 read_unlock(&qdisc_mod_lock);
361 }
362 return q;
363 }
364
365 /* The linklayer setting were not transferred from iproute2, in older
366 * versions, and the rate tables lookup systems have been dropped in
367 * the kernel. To keep backward compatible with older iproute2 tc
368 * utils, we detect the linklayer setting by detecting if the rate
369 * table were modified.
370 *
371 * For linklayer ATM table entries, the rate table will be aligned to
372 * 48 bytes, thus some table entries will contain the same value. The
373 * mpu (min packet unit) is also encoded into the old rate table, thus
374 * starting from the mpu, we find low and high table entries for
375 * mapping this cell. If these entries contain the same value, when
376 * the rate tables have been modified for linklayer ATM.
377 *
378 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
379 * and then roundup to the next cell, calc the table entry one below,
380 * and compare.
381 */
382 static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
383 {
384 int low = roundup(r->mpu, 48);
385 int high = roundup(low+1, 48);
386 int cell_low = low >> r->cell_log;
387 int cell_high = (high >> r->cell_log) - 1;
388
389 /* rtab is too inaccurate at rates > 100Mbit/s */
390 if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
391 pr_debug("TC linklayer: Giving up ATM detection\n");
392 return TC_LINKLAYER_ETHERNET;
393 }
394
395 if ((cell_high > cell_low) && (cell_high < 256)
396 && (rtab[cell_low] == rtab[cell_high])) {
397 pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
398 cell_low, cell_high, rtab[cell_high]);
399 return TC_LINKLAYER_ATM;
400 }
401 return TC_LINKLAYER_ETHERNET;
402 }
403
404 static struct qdisc_rate_table *qdisc_rtab_list;
405
406 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
407 struct nlattr *tab,
408 struct netlink_ext_ack *extack)
409 {
410 struct qdisc_rate_table *rtab;
411
412 if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
413 nla_len(tab) != TC_RTAB_SIZE) {
414 NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching");
415 return NULL;
416 }
417
418 for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
419 if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) &&
420 !memcmp(&rtab->data, nla_data(tab), 1024)) {
421 rtab->refcnt++;
422 return rtab;
423 }
424 }
425
426 rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
427 if (rtab) {
428 rtab->rate = *r;
429 rtab->refcnt = 1;
430 memcpy(rtab->data, nla_data(tab), 1024);
431 if (r->linklayer == TC_LINKLAYER_UNAWARE)
432 r->linklayer = __detect_linklayer(r, rtab->data);
433 rtab->next = qdisc_rtab_list;
434 qdisc_rtab_list = rtab;
435 } else {
436 NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table");
437 }
438 return rtab;
439 }
440 EXPORT_SYMBOL(qdisc_get_rtab);
441
442 void qdisc_put_rtab(struct qdisc_rate_table *tab)
443 {
444 struct qdisc_rate_table *rtab, **rtabp;
445
446 if (!tab || --tab->refcnt)
447 return;
448
449 for (rtabp = &qdisc_rtab_list;
450 (rtab = *rtabp) != NULL;
451 rtabp = &rtab->next) {
452 if (rtab == tab) {
453 *rtabp = rtab->next;
454 kfree(rtab);
455 return;
456 }
457 }
458 }
459 EXPORT_SYMBOL(qdisc_put_rtab);
460
461 static LIST_HEAD(qdisc_stab_list);
462
463 static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
464 [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
465 [TCA_STAB_DATA] = { .type = NLA_BINARY },
466 };
467
468 static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt,
469 struct netlink_ext_ack *extack)
470 {
471 struct nlattr *tb[TCA_STAB_MAX + 1];
472 struct qdisc_size_table *stab;
473 struct tc_sizespec *s;
474 unsigned int tsize = 0;
475 u16 *tab = NULL;
476 int err;
477
478 err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy,
479 extack);
480 if (err < 0)
481 return ERR_PTR(err);
482 if (!tb[TCA_STAB_BASE]) {
483 NL_SET_ERR_MSG(extack, "Size table base attribute is missing");
484 return ERR_PTR(-EINVAL);
485 }
486
487 s = nla_data(tb[TCA_STAB_BASE]);
488
489 if (s->tsize > 0) {
490 if (!tb[TCA_STAB_DATA]) {
491 NL_SET_ERR_MSG(extack, "Size table data attribute is missing");
492 return ERR_PTR(-EINVAL);
493 }
494 tab = nla_data(tb[TCA_STAB_DATA]);
495 tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
496 }
497
498 if (tsize != s->tsize || (!tab && tsize > 0)) {
499 NL_SET_ERR_MSG(extack, "Invalid size of size table");
500 return ERR_PTR(-EINVAL);
501 }
502
503 list_for_each_entry(stab, &qdisc_stab_list, list) {
504 if (memcmp(&stab->szopts, s, sizeof(*s)))
505 continue;
506 if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
507 continue;
508 stab->refcnt++;
509 return stab;
510 }
511
512 stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
513 if (!stab)
514 return ERR_PTR(-ENOMEM);
515
516 stab->refcnt = 1;
517 stab->szopts = *s;
518 if (tsize > 0)
519 memcpy(stab->data, tab, tsize * sizeof(u16));
520
521 list_add_tail(&stab->list, &qdisc_stab_list);
522
523 return stab;
524 }
525
526 void qdisc_put_stab(struct qdisc_size_table *tab)
527 {
528 if (!tab)
529 return;
530
531 if (--tab->refcnt == 0) {
532 list_del(&tab->list);
533 kfree_rcu(tab, rcu);
534 }
535 }
536 EXPORT_SYMBOL(qdisc_put_stab);
537
538 static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
539 {
540 struct nlattr *nest;
541
542 nest = nla_nest_start_noflag(skb, TCA_STAB);
543 if (nest == NULL)
544 goto nla_put_failure;
545 if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
546 goto nla_put_failure;
547 nla_nest_end(skb, nest);
548
549 return skb->len;
550
551 nla_put_failure:
552 return -1;
553 }
554
555 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
556 const struct qdisc_size_table *stab)
557 {
558 int pkt_len, slot;
559
560 pkt_len = skb->len + stab->szopts.overhead;
561 if (unlikely(!stab->szopts.tsize))
562 goto out;
563
564 slot = pkt_len + stab->szopts.cell_align;
565 if (unlikely(slot < 0))
566 slot = 0;
567
568 slot >>= stab->szopts.cell_log;
569 if (likely(slot < stab->szopts.tsize))
570 pkt_len = stab->data[slot];
571 else
572 pkt_len = stab->data[stab->szopts.tsize - 1] *
573 (slot / stab->szopts.tsize) +
574 stab->data[slot % stab->szopts.tsize];
575
576 pkt_len <<= stab->szopts.size_log;
577 out:
578 if (unlikely(pkt_len < 1))
579 pkt_len = 1;
580 qdisc_skb_cb(skb)->pkt_len = pkt_len;
581 }
582 EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
583
584 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc)
585 {
586 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
587 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
588 txt, qdisc->ops->id, qdisc->handle >> 16);
589 qdisc->flags |= TCQ_F_WARN_NONWC;
590 }
591 }
592 EXPORT_SYMBOL(qdisc_warn_nonwc);
593
594 static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
595 {
596 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
597 timer);
598
599 rcu_read_lock();
600 __netif_schedule(qdisc_root(wd->qdisc));
601 rcu_read_unlock();
602
603 return HRTIMER_NORESTART;
604 }
605
606 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
607 clockid_t clockid)
608 {
609 hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED);
610 wd->timer.function = qdisc_watchdog;
611 wd->qdisc = qdisc;
612 }
613 EXPORT_SYMBOL(qdisc_watchdog_init_clockid);
614
615 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
616 {
617 qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC);
618 }
619 EXPORT_SYMBOL(qdisc_watchdog_init);
620
621 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
622 u64 delta_ns)
623 {
624 if (test_bit(__QDISC_STATE_DEACTIVATED,
625 &qdisc_root_sleeping(wd->qdisc)->state))
626 return;
627
628 if (hrtimer_is_queued(&wd->timer)) {
629 /* If timer is already set in [expires, expires + delta_ns],
630 * do not reprogram it.
631 */
632 if (wd->last_expires - expires <= delta_ns)
633 return;
634 }
635
636 wd->last_expires = expires;
637 hrtimer_start_range_ns(&wd->timer,
638 ns_to_ktime(expires),
639 delta_ns,
640 HRTIMER_MODE_ABS_PINNED);
641 }
642 EXPORT_SYMBOL(qdisc_watchdog_schedule_range_ns);
643
644 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
645 {
646 hrtimer_cancel(&wd->timer);
647 }
648 EXPORT_SYMBOL(qdisc_watchdog_cancel);
649
650 static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
651 {
652 struct hlist_head *h;
653 unsigned int i;
654
655 h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL);
656
657 if (h != NULL) {
658 for (i = 0; i < n; i++)
659 INIT_HLIST_HEAD(&h[i]);
660 }
661 return h;
662 }
663
664 void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
665 {
666 struct Qdisc_class_common *cl;
667 struct hlist_node *next;
668 struct hlist_head *nhash, *ohash;
669 unsigned int nsize, nmask, osize;
670 unsigned int i, h;
671
672 /* Rehash when load factor exceeds 0.75 */
673 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
674 return;
675 nsize = clhash->hashsize * 2;
676 nmask = nsize - 1;
677 nhash = qdisc_class_hash_alloc(nsize);
678 if (nhash == NULL)
679 return;
680
681 ohash = clhash->hash;
682 osize = clhash->hashsize;
683
684 sch_tree_lock(sch);
685 for (i = 0; i < osize; i++) {
686 hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
687 h = qdisc_class_hash(cl->classid, nmask);
688 hlist_add_head(&cl->hnode, &nhash[h]);
689 }
690 }
691 clhash->hash = nhash;
692 clhash->hashsize = nsize;
693 clhash->hashmask = nmask;
694 sch_tree_unlock(sch);
695
696 kvfree(ohash);
697 }
698 EXPORT_SYMBOL(qdisc_class_hash_grow);
699
700 int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
701 {
702 unsigned int size = 4;
703
704 clhash->hash = qdisc_class_hash_alloc(size);
705 if (!clhash->hash)
706 return -ENOMEM;
707 clhash->hashsize = size;
708 clhash->hashmask = size - 1;
709 clhash->hashelems = 0;
710 return 0;
711 }
712 EXPORT_SYMBOL(qdisc_class_hash_init);
713
714 void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
715 {
716 kvfree(clhash->hash);
717 }
718 EXPORT_SYMBOL(qdisc_class_hash_destroy);
719
720 void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
721 struct Qdisc_class_common *cl)
722 {
723 unsigned int h;
724
725 INIT_HLIST_NODE(&cl->hnode);
726 h = qdisc_class_hash(cl->classid, clhash->hashmask);
727 hlist_add_head(&cl->hnode, &clhash->hash[h]);
728 clhash->hashelems++;
729 }
730 EXPORT_SYMBOL(qdisc_class_hash_insert);
731
732 void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
733 struct Qdisc_class_common *cl)
734 {
735 hlist_del(&cl->hnode);
736 clhash->hashelems--;
737 }
738 EXPORT_SYMBOL(qdisc_class_hash_remove);
739
740 /* Allocate an unique handle from space managed by kernel
741 * Possible range is [8000-FFFF]:0000 (0x8000 values)
742 */
743 static u32 qdisc_alloc_handle(struct net_device *dev)
744 {
745 int i = 0x8000;
746 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
747
748 do {
749 autohandle += TC_H_MAKE(0x10000U, 0);
750 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
751 autohandle = TC_H_MAKE(0x80000000U, 0);
752 if (!qdisc_lookup(dev, autohandle))
753 return autohandle;
754 cond_resched();
755 } while (--i > 0);
756
757 return 0;
758 }
759
760 void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len)
761 {
762 bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED;
763 const struct Qdisc_class_ops *cops;
764 unsigned long cl;
765 u32 parentid;
766 bool notify;
767 int drops;
768
769 if (n == 0 && len == 0)
770 return;
771 drops = max_t(int, n, 0);
772 rcu_read_lock();
773 while ((parentid = sch->parent)) {
774 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
775 break;
776
777 if (sch->flags & TCQ_F_NOPARENT)
778 break;
779 /* Notify parent qdisc only if child qdisc becomes empty.
780 *
781 * If child was empty even before update then backlog
782 * counter is screwed and we skip notification because
783 * parent class is already passive.
784 *
785 * If the original child was offloaded then it is allowed
786 * to be seem as empty, so the parent is notified anyway.
787 */
788 notify = !sch->q.qlen && !WARN_ON_ONCE(!n &&
789 !qdisc_is_offloaded);
790 /* TODO: perform the search on a per txq basis */
791 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
792 if (sch == NULL) {
793 WARN_ON_ONCE(parentid != TC_H_ROOT);
794 break;
795 }
796 cops = sch->ops->cl_ops;
797 if (notify && cops->qlen_notify) {
798 cl = cops->find(sch, parentid);
799 cops->qlen_notify(sch, cl);
800 }
801 sch->q.qlen -= n;
802 sch->qstats.backlog -= len;
803 __qdisc_qstats_drop(sch, drops);
804 }
805 rcu_read_unlock();
806 }
807 EXPORT_SYMBOL(qdisc_tree_reduce_backlog);
808
809 int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type,
810 void *type_data)
811 {
812 struct net_device *dev = qdisc_dev(sch);
813 int err;
814
815 sch->flags &= ~TCQ_F_OFFLOADED;
816 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
817 return 0;
818
819 err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
820 if (err == -EOPNOTSUPP)
821 return 0;
822
823 if (!err)
824 sch->flags |= TCQ_F_OFFLOADED;
825
826 return err;
827 }
828 EXPORT_SYMBOL(qdisc_offload_dump_helper);
829
830 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
831 struct Qdisc *new, struct Qdisc *old,
832 enum tc_setup_type type, void *type_data,
833 struct netlink_ext_ack *extack)
834 {
835 bool any_qdisc_is_offloaded;
836 int err;
837
838 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
839 return;
840
841 err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
842
843 /* Don't report error if the graft is part of destroy operation. */
844 if (!err || !new || new == &noop_qdisc)
845 return;
846
847 /* Don't report error if the parent, the old child and the new
848 * one are not offloaded.
849 */
850 any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED;
851 any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED;
852 any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED;
853
854 if (any_qdisc_is_offloaded)
855 NL_SET_ERR_MSG(extack, "Offloading graft operation failed.");
856 }
857 EXPORT_SYMBOL(qdisc_offload_graft_helper);
858
859 static void qdisc_offload_graft_root(struct net_device *dev,
860 struct Qdisc *new, struct Qdisc *old,
861 struct netlink_ext_ack *extack)
862 {
863 struct tc_root_qopt_offload graft_offload = {
864 .command = TC_ROOT_GRAFT,
865 .handle = new ? new->handle : 0,
866 .ingress = (new && new->flags & TCQ_F_INGRESS) ||
867 (old && old->flags & TCQ_F_INGRESS),
868 };
869
870 qdisc_offload_graft_helper(dev, NULL, new, old,
871 TC_SETUP_ROOT_QDISC, &graft_offload, extack);
872 }
873
874 static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
875 u32 portid, u32 seq, u16 flags, int event)
876 {
877 struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
878 struct gnet_stats_queue __percpu *cpu_qstats = NULL;
879 struct tcmsg *tcm;
880 struct nlmsghdr *nlh;
881 unsigned char *b = skb_tail_pointer(skb);
882 struct gnet_dump d;
883 struct qdisc_size_table *stab;
884 u32 block_index;
885 __u32 qlen;
886
887 cond_resched();
888 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
889 if (!nlh)
890 goto out_nlmsg_trim;
891 tcm = nlmsg_data(nlh);
892 tcm->tcm_family = AF_UNSPEC;
893 tcm->tcm__pad1 = 0;
894 tcm->tcm__pad2 = 0;
895 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
896 tcm->tcm_parent = clid;
897 tcm->tcm_handle = q->handle;
898 tcm->tcm_info = refcount_read(&q->refcnt);
899 if (nla_put_string(skb, TCA_KIND, q->ops->id))
900 goto nla_put_failure;
901 if (q->ops->ingress_block_get) {
902 block_index = q->ops->ingress_block_get(q);
903 if (block_index &&
904 nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index))
905 goto nla_put_failure;
906 }
907 if (q->ops->egress_block_get) {
908 block_index = q->ops->egress_block_get(q);
909 if (block_index &&
910 nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index))
911 goto nla_put_failure;
912 }
913 if (q->ops->dump && q->ops->dump(q, skb) < 0)
914 goto nla_put_failure;
915 if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED)))
916 goto nla_put_failure;
917 qlen = qdisc_qlen_sum(q);
918
919 stab = rtnl_dereference(q->stab);
920 if (stab && qdisc_dump_stab(skb, stab) < 0)
921 goto nla_put_failure;
922
923 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
924 NULL, &d, TCA_PAD) < 0)
925 goto nla_put_failure;
926
927 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
928 goto nla_put_failure;
929
930 if (qdisc_is_percpu_stats(q)) {
931 cpu_bstats = q->cpu_bstats;
932 cpu_qstats = q->cpu_qstats;
933 }
934
935 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q),
936 &d, cpu_bstats, &q->bstats) < 0 ||
937 gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
938 gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0)
939 goto nla_put_failure;
940
941 if (gnet_stats_finish_copy(&d) < 0)
942 goto nla_put_failure;
943
944 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
945 return skb->len;
946
947 out_nlmsg_trim:
948 nla_put_failure:
949 nlmsg_trim(skb, b);
950 return -1;
951 }
952
953 static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible)
954 {
955 if (q->flags & TCQ_F_BUILTIN)
956 return true;
957 if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible)
958 return true;
959
960 return false;
961 }
962
963 static int qdisc_notify(struct net *net, struct sk_buff *oskb,
964 struct nlmsghdr *n, u32 clid,
965 struct Qdisc *old, struct Qdisc *new)
966 {
967 struct sk_buff *skb;
968 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
969
970 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
971 if (!skb)
972 return -ENOBUFS;
973
974 if (old && !tc_qdisc_dump_ignore(old, false)) {
975 if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
976 0, RTM_DELQDISC) < 0)
977 goto err_out;
978 }
979 if (new && !tc_qdisc_dump_ignore(new, false)) {
980 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
981 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
982 goto err_out;
983 }
984
985 if (skb->len)
986 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
987 n->nlmsg_flags & NLM_F_ECHO);
988
989 err_out:
990 kfree_skb(skb);
991 return -EINVAL;
992 }
993
994 static void notify_and_destroy(struct net *net, struct sk_buff *skb,
995 struct nlmsghdr *n, u32 clid,
996 struct Qdisc *old, struct Qdisc *new)
997 {
998 if (new || old)
999 qdisc_notify(net, skb, n, clid, old, new);
1000
1001 if (old)
1002 qdisc_put(old);
1003 }
1004
1005 static void qdisc_clear_nolock(struct Qdisc *sch)
1006 {
1007 sch->flags &= ~TCQ_F_NOLOCK;
1008 if (!(sch->flags & TCQ_F_CPUSTATS))
1009 return;
1010
1011 free_percpu(sch->cpu_bstats);
1012 free_percpu(sch->cpu_qstats);
1013 sch->cpu_bstats = NULL;
1014 sch->cpu_qstats = NULL;
1015 sch->flags &= ~TCQ_F_CPUSTATS;
1016 }
1017
1018 /* Graft qdisc "new" to class "classid" of qdisc "parent" or
1019 * to device "dev".
1020 *
1021 * When appropriate send a netlink notification using 'skb'
1022 * and "n".
1023 *
1024 * On success, destroy old qdisc.
1025 */
1026
1027 static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
1028 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
1029 struct Qdisc *new, struct Qdisc *old,
1030 struct netlink_ext_ack *extack)
1031 {
1032 struct Qdisc *q = old;
1033 struct net *net = dev_net(dev);
1034
1035 if (parent == NULL) {
1036 unsigned int i, num_q, ingress;
1037
1038 ingress = 0;
1039 num_q = dev->num_tx_queues;
1040 if ((q && q->flags & TCQ_F_INGRESS) ||
1041 (new && new->flags & TCQ_F_INGRESS)) {
1042 num_q = 1;
1043 ingress = 1;
1044 if (!dev_ingress_queue(dev)) {
1045 NL_SET_ERR_MSG(extack, "Device does not have an ingress queue");
1046 return -ENOENT;
1047 }
1048 }
1049
1050 if (dev->flags & IFF_UP)
1051 dev_deactivate(dev);
1052
1053 qdisc_offload_graft_root(dev, new, old, extack);
1054
1055 if (new && new->ops->attach)
1056 goto skip;
1057
1058 for (i = 0; i < num_q; i++) {
1059 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
1060
1061 if (!ingress)
1062 dev_queue = netdev_get_tx_queue(dev, i);
1063
1064 old = dev_graft_qdisc(dev_queue, new);
1065 if (new && i > 0)
1066 qdisc_refcount_inc(new);
1067
1068 if (!ingress)
1069 qdisc_put(old);
1070 }
1071
1072 skip:
1073 if (!ingress) {
1074 notify_and_destroy(net, skb, n, classid,
1075 dev->qdisc, new);
1076 if (new && !new->ops->attach)
1077 qdisc_refcount_inc(new);
1078 dev->qdisc = new ? : &noop_qdisc;
1079
1080 if (new && new->ops->attach)
1081 new->ops->attach(new);
1082 } else {
1083 notify_and_destroy(net, skb, n, classid, old, new);
1084 }
1085
1086 if (dev->flags & IFF_UP)
1087 dev_activate(dev);
1088 } else {
1089 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
1090 unsigned long cl;
1091 int err;
1092
1093 /* Only support running class lockless if parent is lockless */
1094 if (new && (new->flags & TCQ_F_NOLOCK) &&
1095 parent && !(parent->flags & TCQ_F_NOLOCK))
1096 qdisc_clear_nolock(new);
1097
1098 if (!cops || !cops->graft)
1099 return -EOPNOTSUPP;
1100
1101 cl = cops->find(parent, classid);
1102 if (!cl) {
1103 NL_SET_ERR_MSG(extack, "Specified class not found");
1104 return -ENOENT;
1105 }
1106
1107 err = cops->graft(parent, cl, new, &old, extack);
1108 if (err)
1109 return err;
1110 notify_and_destroy(net, skb, n, classid, old, new);
1111 }
1112 return 0;
1113 }
1114
1115 static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca,
1116 struct netlink_ext_ack *extack)
1117 {
1118 u32 block_index;
1119
1120 if (tca[TCA_INGRESS_BLOCK]) {
1121 block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]);
1122
1123 if (!block_index) {
1124 NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0");
1125 return -EINVAL;
1126 }
1127 if (!sch->ops->ingress_block_set) {
1128 NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported");
1129 return -EOPNOTSUPP;
1130 }
1131 sch->ops->ingress_block_set(sch, block_index);
1132 }
1133 if (tca[TCA_EGRESS_BLOCK]) {
1134 block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]);
1135
1136 if (!block_index) {
1137 NL_SET_ERR_MSG(extack, "Egress block index cannot be 0");
1138 return -EINVAL;
1139 }
1140 if (!sch->ops->egress_block_set) {
1141 NL_SET_ERR_MSG(extack, "Egress block sharing is not supported");
1142 return -EOPNOTSUPP;
1143 }
1144 sch->ops->egress_block_set(sch, block_index);
1145 }
1146 return 0;
1147 }
1148
1149 /*
1150 Allocate and initialize new qdisc.
1151
1152 Parameters are passed via opt.
1153 */
1154
1155 static struct Qdisc *qdisc_create(struct net_device *dev,
1156 struct netdev_queue *dev_queue,
1157 struct Qdisc *p, u32 parent, u32 handle,
1158 struct nlattr **tca, int *errp,
1159 struct netlink_ext_ack *extack)
1160 {
1161 int err;
1162 struct nlattr *kind = tca[TCA_KIND];
1163 struct Qdisc *sch;
1164 struct Qdisc_ops *ops;
1165 struct qdisc_size_table *stab;
1166
1167 ops = qdisc_lookup_ops(kind);
1168 #ifdef CONFIG_MODULES
1169 if (ops == NULL && kind != NULL) {
1170 char name[IFNAMSIZ];
1171 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
1172 /* We dropped the RTNL semaphore in order to
1173 * perform the module load. So, even if we
1174 * succeeded in loading the module we have to
1175 * tell the caller to replay the request. We
1176 * indicate this using -EAGAIN.
1177 * We replay the request because the device may
1178 * go away in the mean time.
1179 */
1180 rtnl_unlock();
1181 request_module("sch_%s", name);
1182 rtnl_lock();
1183 ops = qdisc_lookup_ops(kind);
1184 if (ops != NULL) {
1185 /* We will try again qdisc_lookup_ops,
1186 * so don't keep a reference.
1187 */
1188 module_put(ops->owner);
1189 err = -EAGAIN;
1190 goto err_out;
1191 }
1192 }
1193 }
1194 #endif
1195
1196 err = -ENOENT;
1197 if (!ops) {
1198 NL_SET_ERR_MSG(extack, "Specified qdisc not found");
1199 goto err_out;
1200 }
1201
1202 sch = qdisc_alloc(dev_queue, ops, extack);
1203 if (IS_ERR(sch)) {
1204 err = PTR_ERR(sch);
1205 goto err_out2;
1206 }
1207
1208 sch->parent = parent;
1209
1210 if (handle == TC_H_INGRESS) {
1211 sch->flags |= TCQ_F_INGRESS;
1212 handle = TC_H_MAKE(TC_H_INGRESS, 0);
1213 } else {
1214 if (handle == 0) {
1215 handle = qdisc_alloc_handle(dev);
1216 if (handle == 0) {
1217 NL_SET_ERR_MSG(extack, "Maximum number of qdisc handles was exceeded");
1218 err = -ENOSPC;
1219 goto err_out3;
1220 }
1221 }
1222 if (!netif_is_multiqueue(dev))
1223 sch->flags |= TCQ_F_ONETXQUEUE;
1224 }
1225
1226 sch->handle = handle;
1227
1228 /* This exist to keep backward compatible with a userspace
1229 * loophole, what allowed userspace to get IFF_NO_QUEUE
1230 * facility on older kernels by setting tx_queue_len=0 (prior
1231 * to qdisc init), and then forgot to reinit tx_queue_len
1232 * before again attaching a qdisc.
1233 */
1234 if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) {
1235 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
1236 netdev_info(dev, "Caught tx_queue_len zero misconfig\n");
1237 }
1238
1239 err = qdisc_block_indexes_set(sch, tca, extack);
1240 if (err)
1241 goto err_out3;
1242
1243 if (ops->init) {
1244 err = ops->init(sch, tca[TCA_OPTIONS], extack);
1245 if (err != 0)
1246 goto err_out5;
1247 }
1248
1249 if (tca[TCA_STAB]) {
1250 stab = qdisc_get_stab(tca[TCA_STAB], extack);
1251 if (IS_ERR(stab)) {
1252 err = PTR_ERR(stab);
1253 goto err_out4;
1254 }
1255 rcu_assign_pointer(sch->stab, stab);
1256 }
1257 if (tca[TCA_RATE]) {
1258 seqcount_t *running;
1259
1260 err = -EOPNOTSUPP;
1261 if (sch->flags & TCQ_F_MQROOT) {
1262 NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc");
1263 goto err_out4;
1264 }
1265
1266 if (sch->parent != TC_H_ROOT &&
1267 !(sch->flags & TCQ_F_INGRESS) &&
1268 (!p || !(p->flags & TCQ_F_MQROOT)))
1269 running = qdisc_root_sleeping_running(sch);
1270 else
1271 running = &sch->running;
1272
1273 err = gen_new_estimator(&sch->bstats,
1274 sch->cpu_bstats,
1275 &sch->rate_est,
1276 NULL,
1277 running,
1278 tca[TCA_RATE]);
1279 if (err) {
1280 NL_SET_ERR_MSG(extack, "Failed to generate new estimator");
1281 goto err_out4;
1282 }
1283 }
1284
1285 qdisc_hash_add(sch, false);
1286
1287 return sch;
1288
1289 err_out5:
1290 /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */
1291 if (ops->destroy)
1292 ops->destroy(sch);
1293 err_out3:
1294 dev_put(dev);
1295 qdisc_free(sch);
1296 err_out2:
1297 module_put(ops->owner);
1298 err_out:
1299 *errp = err;
1300 return NULL;
1301
1302 err_out4:
1303 /*
1304 * Any broken qdiscs that would require a ops->reset() here?
1305 * The qdisc was never in action so it shouldn't be necessary.
1306 */
1307 qdisc_put_stab(rtnl_dereference(sch->stab));
1308 if (ops->destroy)
1309 ops->destroy(sch);
1310 goto err_out3;
1311 }
1312
1313 static int qdisc_change(struct Qdisc *sch, struct nlattr **tca,
1314 struct netlink_ext_ack *extack)
1315 {
1316 struct qdisc_size_table *ostab, *stab = NULL;
1317 int err = 0;
1318
1319 if (tca[TCA_OPTIONS]) {
1320 if (!sch->ops->change) {
1321 NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc");
1322 return -EINVAL;
1323 }
1324 if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
1325 NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
1326 return -EOPNOTSUPP;
1327 }
1328 err = sch->ops->change(sch, tca[TCA_OPTIONS], extack);
1329 if (err)
1330 return err;
1331 }
1332
1333 if (tca[TCA_STAB]) {
1334 stab = qdisc_get_stab(tca[TCA_STAB], extack);
1335 if (IS_ERR(stab))
1336 return PTR_ERR(stab);
1337 }
1338
1339 ostab = rtnl_dereference(sch->stab);
1340 rcu_assign_pointer(sch->stab, stab);
1341 qdisc_put_stab(ostab);
1342
1343 if (tca[TCA_RATE]) {
1344 /* NB: ignores errors from replace_estimator
1345 because change can't be undone. */
1346 if (sch->flags & TCQ_F_MQROOT)
1347 goto out;
1348 gen_replace_estimator(&sch->bstats,
1349 sch->cpu_bstats,
1350 &sch->rate_est,
1351 NULL,
1352 qdisc_root_sleeping_running(sch),
1353 tca[TCA_RATE]);
1354 }
1355 out:
1356 return 0;
1357 }
1358
1359 struct check_loop_arg {
1360 struct qdisc_walker w;
1361 struct Qdisc *p;
1362 int depth;
1363 };
1364
1365 static int check_loop_fn(struct Qdisc *q, unsigned long cl,
1366 struct qdisc_walker *w);
1367
1368 static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
1369 {
1370 struct check_loop_arg arg;
1371
1372 if (q->ops->cl_ops == NULL)
1373 return 0;
1374
1375 arg.w.stop = arg.w.skip = arg.w.count = 0;
1376 arg.w.fn = check_loop_fn;
1377 arg.depth = depth;
1378 arg.p = p;
1379 q->ops->cl_ops->walk(q, &arg.w);
1380 return arg.w.stop ? -ELOOP : 0;
1381 }
1382
1383 static int
1384 check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
1385 {
1386 struct Qdisc *leaf;
1387 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1388 struct check_loop_arg *arg = (struct check_loop_arg *)w;
1389
1390 leaf = cops->leaf(q, cl);
1391 if (leaf) {
1392 if (leaf == arg->p || arg->depth > 7)
1393 return -ELOOP;
1394 return check_loop(leaf, arg->p, arg->depth + 1);
1395 }
1396 return 0;
1397 }
1398
1399 const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = {
1400 [TCA_KIND] = { .type = NLA_STRING },
1401 [TCA_RATE] = { .type = NLA_BINARY,
1402 .len = sizeof(struct tc_estimator) },
1403 [TCA_STAB] = { .type = NLA_NESTED },
1404 [TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG },
1405 [TCA_CHAIN] = { .type = NLA_U32 },
1406 [TCA_INGRESS_BLOCK] = { .type = NLA_U32 },
1407 [TCA_EGRESS_BLOCK] = { .type = NLA_U32 },
1408 };
1409
1410 /*
1411 * Delete/get qdisc.
1412 */
1413
1414 static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
1415 struct netlink_ext_ack *extack)
1416 {
1417 struct net *net = sock_net(skb->sk);
1418 struct tcmsg *tcm = nlmsg_data(n);
1419 struct nlattr *tca[TCA_MAX + 1];
1420 struct net_device *dev;
1421 u32 clid;
1422 struct Qdisc *q = NULL;
1423 struct Qdisc *p = NULL;
1424 int err;
1425
1426 if ((n->nlmsg_type != RTM_GETQDISC) &&
1427 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1428 return -EPERM;
1429
1430 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
1431 rtm_tca_policy, extack);
1432 if (err < 0)
1433 return err;
1434
1435 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1436 if (!dev)
1437 return -ENODEV;
1438
1439 clid = tcm->tcm_parent;
1440 if (clid) {
1441 if (clid != TC_H_ROOT) {
1442 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
1443 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1444 if (!p) {
1445 NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid");
1446 return -ENOENT;
1447 }
1448 q = qdisc_leaf(p, clid);
1449 } else if (dev_ingress_queue(dev)) {
1450 q = dev_ingress_queue(dev)->qdisc_sleeping;
1451 }
1452 } else {
1453 q = dev->qdisc;
1454 }
1455 if (!q) {
1456 NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device");
1457 return -ENOENT;
1458 }
1459
1460 if (tcm->tcm_handle && q->handle != tcm->tcm_handle) {
1461 NL_SET_ERR_MSG(extack, "Invalid handle");
1462 return -EINVAL;
1463 }
1464 } else {
1465 q = qdisc_lookup(dev, tcm->tcm_handle);
1466 if (!q) {
1467 NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle");
1468 return -ENOENT;
1469 }
1470 }
1471
1472 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1473 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1474 return -EINVAL;
1475 }
1476
1477 if (n->nlmsg_type == RTM_DELQDISC) {
1478 if (!clid) {
1479 NL_SET_ERR_MSG(extack, "Classid cannot be zero");
1480 return -EINVAL;
1481 }
1482 if (q->handle == 0) {
1483 NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero");
1484 return -ENOENT;
1485 }
1486 err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack);
1487 if (err != 0)
1488 return err;
1489 } else {
1490 qdisc_notify(net, skb, n, clid, NULL, q);
1491 }
1492 return 0;
1493 }
1494
1495 /*
1496 * Create/change qdisc.
1497 */
1498
1499 static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
1500 struct netlink_ext_ack *extack)
1501 {
1502 struct net *net = sock_net(skb->sk);
1503 struct tcmsg *tcm;
1504 struct nlattr *tca[TCA_MAX + 1];
1505 struct net_device *dev;
1506 u32 clid;
1507 struct Qdisc *q, *p;
1508 int err;
1509
1510 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1511 return -EPERM;
1512
1513 replay:
1514 /* Reinit, just in case something touches this. */
1515 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
1516 rtm_tca_policy, extack);
1517 if (err < 0)
1518 return err;
1519
1520 tcm = nlmsg_data(n);
1521 clid = tcm->tcm_parent;
1522 q = p = NULL;
1523
1524 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1525 if (!dev)
1526 return -ENODEV;
1527
1528
1529 if (clid) {
1530 if (clid != TC_H_ROOT) {
1531 if (clid != TC_H_INGRESS) {
1532 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1533 if (!p) {
1534 NL_SET_ERR_MSG(extack, "Failed to find specified qdisc");
1535 return -ENOENT;
1536 }
1537 q = qdisc_leaf(p, clid);
1538 } else if (dev_ingress_queue_create(dev)) {
1539 q = dev_ingress_queue(dev)->qdisc_sleeping;
1540 }
1541 } else {
1542 q = dev->qdisc;
1543 }
1544
1545 /* It may be default qdisc, ignore it */
1546 if (q && q->handle == 0)
1547 q = NULL;
1548
1549 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1550 if (tcm->tcm_handle) {
1551 if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) {
1552 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override");
1553 return -EEXIST;
1554 }
1555 if (TC_H_MIN(tcm->tcm_handle)) {
1556 NL_SET_ERR_MSG(extack, "Invalid minor handle");
1557 return -EINVAL;
1558 }
1559 q = qdisc_lookup(dev, tcm->tcm_handle);
1560 if (!q)
1561 goto create_n_graft;
1562 if (n->nlmsg_flags & NLM_F_EXCL) {
1563 NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override");
1564 return -EEXIST;
1565 }
1566 if (tca[TCA_KIND] &&
1567 nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1568 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1569 return -EINVAL;
1570 }
1571 if (q == p ||
1572 (p && check_loop(q, p, 0))) {
1573 NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected");
1574 return -ELOOP;
1575 }
1576 qdisc_refcount_inc(q);
1577 goto graft;
1578 } else {
1579 if (!q)
1580 goto create_n_graft;
1581
1582 /* This magic test requires explanation.
1583 *
1584 * We know, that some child q is already
1585 * attached to this parent and have choice:
1586 * either to change it or to create/graft new one.
1587 *
1588 * 1. We are allowed to create/graft only
1589 * if CREATE and REPLACE flags are set.
1590 *
1591 * 2. If EXCL is set, requestor wanted to say,
1592 * that qdisc tcm_handle is not expected
1593 * to exist, so that we choose create/graft too.
1594 *
1595 * 3. The last case is when no flags are set.
1596 * Alas, it is sort of hole in API, we
1597 * cannot decide what to do unambiguously.
1598 * For now we select create/graft, if
1599 * user gave KIND, which does not match existing.
1600 */
1601 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1602 (n->nlmsg_flags & NLM_F_REPLACE) &&
1603 ((n->nlmsg_flags & NLM_F_EXCL) ||
1604 (tca[TCA_KIND] &&
1605 nla_strcmp(tca[TCA_KIND], q->ops->id))))
1606 goto create_n_graft;
1607 }
1608 }
1609 } else {
1610 if (!tcm->tcm_handle) {
1611 NL_SET_ERR_MSG(extack, "Handle cannot be zero");
1612 return -EINVAL;
1613 }
1614 q = qdisc_lookup(dev, tcm->tcm_handle);
1615 }
1616
1617 /* Change qdisc parameters */
1618 if (!q) {
1619 NL_SET_ERR_MSG(extack, "Specified qdisc not found");
1620 return -ENOENT;
1621 }
1622 if (n->nlmsg_flags & NLM_F_EXCL) {
1623 NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify");
1624 return -EEXIST;
1625 }
1626 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1627 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1628 return -EINVAL;
1629 }
1630 err = qdisc_change(q, tca, extack);
1631 if (err == 0)
1632 qdisc_notify(net, skb, n, clid, NULL, q);
1633 return err;
1634
1635 create_n_graft:
1636 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1637 NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag");
1638 return -ENOENT;
1639 }
1640 if (clid == TC_H_INGRESS) {
1641 if (dev_ingress_queue(dev)) {
1642 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1643 tcm->tcm_parent, tcm->tcm_parent,
1644 tca, &err, extack);
1645 } else {
1646 NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device");
1647 err = -ENOENT;
1648 }
1649 } else {
1650 struct netdev_queue *dev_queue;
1651
1652 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1653 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1654 else if (p)
1655 dev_queue = p->dev_queue;
1656 else
1657 dev_queue = netdev_get_tx_queue(dev, 0);
1658
1659 q = qdisc_create(dev, dev_queue, p,
1660 tcm->tcm_parent, tcm->tcm_handle,
1661 tca, &err, extack);
1662 }
1663 if (q == NULL) {
1664 if (err == -EAGAIN)
1665 goto replay;
1666 return err;
1667 }
1668
1669 graft:
1670 err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack);
1671 if (err) {
1672 if (q)
1673 qdisc_put(q);
1674 return err;
1675 }
1676
1677 return 0;
1678 }
1679
1680 static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1681 struct netlink_callback *cb,
1682 int *q_idx_p, int s_q_idx, bool recur,
1683 bool dump_invisible)
1684 {
1685 int ret = 0, q_idx = *q_idx_p;
1686 struct Qdisc *q;
1687 int b;
1688
1689 if (!root)
1690 return 0;
1691
1692 q = root;
1693 if (q_idx < s_q_idx) {
1694 q_idx++;
1695 } else {
1696 if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1697 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1698 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1699 RTM_NEWQDISC) <= 0)
1700 goto done;
1701 q_idx++;
1702 }
1703
1704 /* If dumping singletons, there is no qdisc_dev(root) and the singleton
1705 * itself has already been dumped.
1706 *
1707 * If we've already dumped the top-level (ingress) qdisc above and the global
1708 * qdisc hashtable, we don't want to hit it again
1709 */
1710 if (!qdisc_dev(root) || !recur)
1711 goto out;
1712
1713 hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
1714 if (q_idx < s_q_idx) {
1715 q_idx++;
1716 continue;
1717 }
1718 if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1719 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1720 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1721 RTM_NEWQDISC) <= 0)
1722 goto done;
1723 q_idx++;
1724 }
1725
1726 out:
1727 *q_idx_p = q_idx;
1728 return ret;
1729 done:
1730 ret = -1;
1731 goto out;
1732 }
1733
1734 static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1735 {
1736 struct net *net = sock_net(skb->sk);
1737 int idx, q_idx;
1738 int s_idx, s_q_idx;
1739 struct net_device *dev;
1740 const struct nlmsghdr *nlh = cb->nlh;
1741 struct nlattr *tca[TCA_MAX + 1];
1742 int err;
1743
1744 s_idx = cb->args[0];
1745 s_q_idx = q_idx = cb->args[1];
1746
1747 idx = 0;
1748 ASSERT_RTNL();
1749
1750 err = nlmsg_parse_deprecated(nlh, sizeof(struct tcmsg), tca, TCA_MAX,
1751 rtm_tca_policy, cb->extack);
1752 if (err < 0)
1753 return err;
1754
1755 for_each_netdev(net, dev) {
1756 struct netdev_queue *dev_queue;
1757
1758 if (idx < s_idx)
1759 goto cont;
1760 if (idx > s_idx)
1761 s_q_idx = 0;
1762 q_idx = 0;
1763
1764 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx,
1765 true, tca[TCA_DUMP_INVISIBLE]) < 0)
1766 goto done;
1767
1768 dev_queue = dev_ingress_queue(dev);
1769 if (dev_queue &&
1770 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1771 &q_idx, s_q_idx, false,
1772 tca[TCA_DUMP_INVISIBLE]) < 0)
1773 goto done;
1774
1775 cont:
1776 idx++;
1777 }
1778
1779 done:
1780 cb->args[0] = idx;
1781 cb->args[1] = q_idx;
1782
1783 return skb->len;
1784 }
1785
1786
1787
1788 /************************************************
1789 * Traffic classes manipulation. *
1790 ************************************************/
1791
1792 static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1793 unsigned long cl,
1794 u32 portid, u32 seq, u16 flags, int event)
1795 {
1796 struct tcmsg *tcm;
1797 struct nlmsghdr *nlh;
1798 unsigned char *b = skb_tail_pointer(skb);
1799 struct gnet_dump d;
1800 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1801
1802 cond_resched();
1803 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1804 if (!nlh)
1805 goto out_nlmsg_trim;
1806 tcm = nlmsg_data(nlh);
1807 tcm->tcm_family = AF_UNSPEC;
1808 tcm->tcm__pad1 = 0;
1809 tcm->tcm__pad2 = 0;
1810 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1811 tcm->tcm_parent = q->handle;
1812 tcm->tcm_handle = q->handle;
1813 tcm->tcm_info = 0;
1814 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1815 goto nla_put_failure;
1816 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1817 goto nla_put_failure;
1818
1819 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1820 NULL, &d, TCA_PAD) < 0)
1821 goto nla_put_failure;
1822
1823 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1824 goto nla_put_failure;
1825
1826 if (gnet_stats_finish_copy(&d) < 0)
1827 goto nla_put_failure;
1828
1829 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1830 return skb->len;
1831
1832 out_nlmsg_trim:
1833 nla_put_failure:
1834 nlmsg_trim(skb, b);
1835 return -1;
1836 }
1837
1838 static int tclass_notify(struct net *net, struct sk_buff *oskb,
1839 struct nlmsghdr *n, struct Qdisc *q,
1840 unsigned long cl, int event)
1841 {
1842 struct sk_buff *skb;
1843 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1844 int err = 0;
1845
1846 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1847 if (!skb)
1848 return -ENOBUFS;
1849
1850 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
1851 kfree_skb(skb);
1852 return -EINVAL;
1853 }
1854
1855 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1856 n->nlmsg_flags & NLM_F_ECHO);
1857 if (err > 0)
1858 err = 0;
1859 return err;
1860 }
1861
1862 static int tclass_del_notify(struct net *net,
1863 const struct Qdisc_class_ops *cops,
1864 struct sk_buff *oskb, struct nlmsghdr *n,
1865 struct Qdisc *q, unsigned long cl)
1866 {
1867 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1868 struct sk_buff *skb;
1869 int err = 0;
1870
1871 if (!cops->delete)
1872 return -EOPNOTSUPP;
1873
1874 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1875 if (!skb)
1876 return -ENOBUFS;
1877
1878 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
1879 RTM_DELTCLASS) < 0) {
1880 kfree_skb(skb);
1881 return -EINVAL;
1882 }
1883
1884 err = cops->delete(q, cl);
1885 if (err) {
1886 kfree_skb(skb);
1887 return err;
1888 }
1889
1890 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1891 n->nlmsg_flags & NLM_F_ECHO);
1892 if (err > 0)
1893 err = 0;
1894 return err;
1895 }
1896
1897 #ifdef CONFIG_NET_CLS
1898
1899 struct tcf_bind_args {
1900 struct tcf_walker w;
1901 unsigned long base;
1902 unsigned long cl;
1903 u32 classid;
1904 };
1905
1906 static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
1907 {
1908 struct tcf_bind_args *a = (void *)arg;
1909
1910 if (tp->ops->bind_class) {
1911 struct Qdisc *q = tcf_block_q(tp->chain->block);
1912
1913 sch_tree_lock(q);
1914 tp->ops->bind_class(n, a->classid, a->cl, q, a->base);
1915 sch_tree_unlock(q);
1916 }
1917 return 0;
1918 }
1919
1920 struct tc_bind_class_args {
1921 struct qdisc_walker w;
1922 unsigned long new_cl;
1923 u32 portid;
1924 u32 clid;
1925 };
1926
1927 static int tc_bind_class_walker(struct Qdisc *q, unsigned long cl,
1928 struct qdisc_walker *w)
1929 {
1930 struct tc_bind_class_args *a = (struct tc_bind_class_args *)w;
1931 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1932 struct tcf_block *block;
1933 struct tcf_chain *chain;
1934
1935 block = cops->tcf_block(q, cl, NULL);
1936 if (!block)
1937 return 0;
1938 for (chain = tcf_get_next_chain(block, NULL);
1939 chain;
1940 chain = tcf_get_next_chain(block, chain)) {
1941 struct tcf_proto *tp;
1942
1943 for (tp = tcf_get_next_proto(chain, NULL, true);
1944 tp; tp = tcf_get_next_proto(chain, tp, true)) {
1945 struct tcf_bind_args arg = {};
1946
1947 arg.w.fn = tcf_node_bind;
1948 arg.classid = a->clid;
1949 arg.base = cl;
1950 arg.cl = a->new_cl;
1951 tp->ops->walk(tp, &arg.w, true);
1952 }
1953 }
1954
1955 return 0;
1956 }
1957
1958 static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
1959 unsigned long new_cl)
1960 {
1961 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1962 struct tc_bind_class_args args = {};
1963
1964 if (!cops->tcf_block)
1965 return;
1966 args.portid = portid;
1967 args.clid = clid;
1968 args.new_cl = new_cl;
1969 args.w.fn = tc_bind_class_walker;
1970 q->ops->cl_ops->walk(q, &args.w);
1971 }
1972
1973 #else
1974
1975 static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
1976 unsigned long new_cl)
1977 {
1978 }
1979
1980 #endif
1981
1982 static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
1983 struct netlink_ext_ack *extack)
1984 {
1985 struct net *net = sock_net(skb->sk);
1986 struct tcmsg *tcm = nlmsg_data(n);
1987 struct nlattr *tca[TCA_MAX + 1];
1988 struct net_device *dev;
1989 struct Qdisc *q = NULL;
1990 const struct Qdisc_class_ops *cops;
1991 unsigned long cl = 0;
1992 unsigned long new_cl;
1993 u32 portid;
1994 u32 clid;
1995 u32 qid;
1996 int err;
1997
1998 if ((n->nlmsg_type != RTM_GETTCLASS) &&
1999 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2000 return -EPERM;
2001
2002 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
2003 rtm_tca_policy, extack);
2004 if (err < 0)
2005 return err;
2006
2007 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2008 if (!dev)
2009 return -ENODEV;
2010
2011 /*
2012 parent == TC_H_UNSPEC - unspecified parent.
2013 parent == TC_H_ROOT - class is root, which has no parent.
2014 parent == X:0 - parent is root class.
2015 parent == X:Y - parent is a node in hierarchy.
2016 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
2017
2018 handle == 0:0 - generate handle from kernel pool.
2019 handle == 0:Y - class is X:Y, where X:0 is qdisc.
2020 handle == X:Y - clear.
2021 handle == X:0 - root class.
2022 */
2023
2024 /* Step 1. Determine qdisc handle X:0 */
2025
2026 portid = tcm->tcm_parent;
2027 clid = tcm->tcm_handle;
2028 qid = TC_H_MAJ(clid);
2029
2030 if (portid != TC_H_ROOT) {
2031 u32 qid1 = TC_H_MAJ(portid);
2032
2033 if (qid && qid1) {
2034 /* If both majors are known, they must be identical. */
2035 if (qid != qid1)
2036 return -EINVAL;
2037 } else if (qid1) {
2038 qid = qid1;
2039 } else if (qid == 0)
2040 qid = dev->qdisc->handle;
2041
2042 /* Now qid is genuine qdisc handle consistent
2043 * both with parent and child.
2044 *
2045 * TC_H_MAJ(portid) still may be unspecified, complete it now.
2046 */
2047 if (portid)
2048 portid = TC_H_MAKE(qid, portid);
2049 } else {
2050 if (qid == 0)
2051 qid = dev->qdisc->handle;
2052 }
2053
2054 /* OK. Locate qdisc */
2055 q = qdisc_lookup(dev, qid);
2056 if (!q)
2057 return -ENOENT;
2058
2059 /* An check that it supports classes */
2060 cops = q->ops->cl_ops;
2061 if (cops == NULL)
2062 return -EINVAL;
2063
2064 /* Now try to get class */
2065 if (clid == 0) {
2066 if (portid == TC_H_ROOT)
2067 clid = qid;
2068 } else
2069 clid = TC_H_MAKE(qid, clid);
2070
2071 if (clid)
2072 cl = cops->find(q, clid);
2073
2074 if (cl == 0) {
2075 err = -ENOENT;
2076 if (n->nlmsg_type != RTM_NEWTCLASS ||
2077 !(n->nlmsg_flags & NLM_F_CREATE))
2078 goto out;
2079 } else {
2080 switch (n->nlmsg_type) {
2081 case RTM_NEWTCLASS:
2082 err = -EEXIST;
2083 if (n->nlmsg_flags & NLM_F_EXCL)
2084 goto out;
2085 break;
2086 case RTM_DELTCLASS:
2087 err = tclass_del_notify(net, cops, skb, n, q, cl);
2088 /* Unbind the class with flilters with 0 */
2089 tc_bind_tclass(q, portid, clid, 0);
2090 goto out;
2091 case RTM_GETTCLASS:
2092 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
2093 goto out;
2094 default:
2095 err = -EINVAL;
2096 goto out;
2097 }
2098 }
2099
2100 if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
2101 NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes");
2102 return -EOPNOTSUPP;
2103 }
2104
2105 new_cl = cl;
2106 err = -EOPNOTSUPP;
2107 if (cops->change)
2108 err = cops->change(q, clid, portid, tca, &new_cl, extack);
2109 if (err == 0) {
2110 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
2111 /* We just create a new class, need to do reverse binding. */
2112 if (cl != new_cl)
2113 tc_bind_tclass(q, portid, clid, new_cl);
2114 }
2115 out:
2116 return err;
2117 }
2118
2119 struct qdisc_dump_args {
2120 struct qdisc_walker w;
2121 struct sk_buff *skb;
2122 struct netlink_callback *cb;
2123 };
2124
2125 static int qdisc_class_dump(struct Qdisc *q, unsigned long cl,
2126 struct qdisc_walker *arg)
2127 {
2128 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
2129
2130 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
2131 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2132 RTM_NEWTCLASS);
2133 }
2134
2135 static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
2136 struct tcmsg *tcm, struct netlink_callback *cb,
2137 int *t_p, int s_t)
2138 {
2139 struct qdisc_dump_args arg;
2140
2141 if (tc_qdisc_dump_ignore(q, false) ||
2142 *t_p < s_t || !q->ops->cl_ops ||
2143 (tcm->tcm_parent &&
2144 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
2145 (*t_p)++;
2146 return 0;
2147 }
2148 if (*t_p > s_t)
2149 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
2150 arg.w.fn = qdisc_class_dump;
2151 arg.skb = skb;
2152 arg.cb = cb;
2153 arg.w.stop = 0;
2154 arg.w.skip = cb->args[1];
2155 arg.w.count = 0;
2156 q->ops->cl_ops->walk(q, &arg.w);
2157 cb->args[1] = arg.w.count;
2158 if (arg.w.stop)
2159 return -1;
2160 (*t_p)++;
2161 return 0;
2162 }
2163
2164 static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
2165 struct tcmsg *tcm, struct netlink_callback *cb,
2166 int *t_p, int s_t)
2167 {
2168 struct Qdisc *q;
2169 int b;
2170
2171 if (!root)
2172 return 0;
2173
2174 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
2175 return -1;
2176
2177 if (!qdisc_dev(root))
2178 return 0;
2179
2180 if (tcm->tcm_parent) {
2181 q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent));
2182 if (q && q != root &&
2183 tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
2184 return -1;
2185 return 0;
2186 }
2187 hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
2188 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
2189 return -1;
2190 }
2191
2192 return 0;
2193 }
2194
2195 static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
2196 {
2197 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2198 struct net *net = sock_net(skb->sk);
2199 struct netdev_queue *dev_queue;
2200 struct net_device *dev;
2201 int t, s_t;
2202
2203 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2204 return 0;
2205 dev = dev_get_by_index(net, tcm->tcm_ifindex);
2206 if (!dev)
2207 return 0;
2208
2209 s_t = cb->args[0];
2210 t = 0;
2211
2212 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
2213 goto done;
2214
2215 dev_queue = dev_ingress_queue(dev);
2216 if (dev_queue &&
2217 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
2218 &t, s_t) < 0)
2219 goto done;
2220
2221 done:
2222 cb->args[0] = t;
2223
2224 dev_put(dev);
2225 return skb->len;
2226 }
2227
2228 #ifdef CONFIG_PROC_FS
2229 static int psched_show(struct seq_file *seq, void *v)
2230 {
2231 seq_printf(seq, "%08x %08x %08x %08x\n",
2232 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
2233 1000000,
2234 (u32)NSEC_PER_SEC / hrtimer_resolution);
2235
2236 return 0;
2237 }
2238
2239 static int __net_init psched_net_init(struct net *net)
2240 {
2241 struct proc_dir_entry *e;
2242
2243 e = proc_create_single("psched", 0, net->proc_net, psched_show);
2244 if (e == NULL)
2245 return -ENOMEM;
2246
2247 return 0;
2248 }
2249
2250 static void __net_exit psched_net_exit(struct net *net)
2251 {
2252 remove_proc_entry("psched", net->proc_net);
2253 }
2254 #else
2255 static int __net_init psched_net_init(struct net *net)
2256 {
2257 return 0;
2258 }
2259
2260 static void __net_exit psched_net_exit(struct net *net)
2261 {
2262 }
2263 #endif
2264
2265 static struct pernet_operations psched_net_ops = {
2266 .init = psched_net_init,
2267 .exit = psched_net_exit,
2268 };
2269
2270 static int __init pktsched_init(void)
2271 {
2272 int err;
2273
2274 err = register_pernet_subsys(&psched_net_ops);
2275 if (err) {
2276 pr_err("pktsched_init: "
2277 "cannot initialize per netns operations\n");
2278 return err;
2279 }
2280
2281 register_qdisc(&pfifo_fast_ops);
2282 register_qdisc(&pfifo_qdisc_ops);
2283 register_qdisc(&bfifo_qdisc_ops);
2284 register_qdisc(&pfifo_head_drop_qdisc_ops);
2285 register_qdisc(&mq_qdisc_ops);
2286 register_qdisc(&noqueue_qdisc_ops);
2287
2288 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0);
2289 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0);
2290 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc,
2291 0);
2292 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0);
2293 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0);
2294 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass,
2295 0);
2296
2297 return 0;
2298 }
2299
2300 subsys_initcall(pktsched_init);
Linux with added FPC-III support