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WIP FPC-III support
[linux/fpc-iii.git] / net / sched / sch_api.c
blob51cb553e4317a3e2bca1996e0df004aab8111d58
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 #include <trace/events/qdisc.h>
36
37 /*
38
39 Short review.
40 -------------
41
42 This file consists of two interrelated parts:
43
44 1. queueing disciplines manager frontend.
45 2. traffic classes manager frontend.
46
47 Generally, queueing discipline ("qdisc") is a black box,
48 which is able to enqueue packets and to dequeue them (when
49 device is ready to send something) in order and at times
50 determined by algorithm hidden in it.
51
52 qdisc's are divided to two categories:
53 - "queues", which have no internal structure visible from outside.
54 - "schedulers", which split all the packets to "traffic classes",
55 using "packet classifiers" (look at cls_api.c)
56
57 In turn, classes may have child qdiscs (as rule, queues)
58 attached to them etc. etc. etc.
59
60 The goal of the routines in this file is to translate
61 information supplied by user in the form of handles
62 to more intelligible for kernel form, to make some sanity
63 checks and part of work, which is common to all qdiscs
64 and to provide rtnetlink notifications.
65
66 All real intelligent work is done inside qdisc modules.
67
68
69
70 Every discipline has two major routines: enqueue and dequeue.
71
72 ---dequeue
73
74 dequeue usually returns a skb to send. It is allowed to return NULL,
75 but it does not mean that queue is empty, it just means that
76 discipline does not want to send anything this time.
77 Queue is really empty if q->q.qlen == 0.
78 For complicated disciplines with multiple queues q->q is not
79 real packet queue, but however q->q.qlen must be valid.
80
81 ---enqueue
82
83 enqueue returns 0, if packet was enqueued successfully.
84 If packet (this one or another one) was dropped, it returns
85 not zero error code.
86 NET_XMIT_DROP - this packet dropped
87 Expected action: do not backoff, but wait until queue will clear.
88 NET_XMIT_CN - probably this packet enqueued, but another one dropped.
89 Expected action: backoff or ignore
90
91 Auxiliary routines:
92
93 ---peek
94
95 like dequeue but without removing a packet from the queue
96
97 ---reset
98
99 returns qdisc to initial state: purge all buffers, clear all
100 timers, counters (except for statistics) etc.
101
102 ---init
103
104 initializes newly created qdisc.
105
106 ---destroy
107
108 destroys resources allocated by init and during lifetime of qdisc.
109
110 ---change
111
112 changes qdisc parameters.
113 */
114
115 /* Protects list of registered TC modules. It is pure SMP lock. */
116 static DEFINE_RWLOCK(qdisc_mod_lock);
117
118
119 /************************************************
120 * Queueing disciplines manipulation. *
121 ************************************************/
122
123
124 /* The list of all installed queueing disciplines. */
125
126 static struct Qdisc_ops *qdisc_base;
127
128 /* Register/unregister queueing discipline */
129
130 int register_qdisc(struct Qdisc_ops *qops)
131 {
132 struct Qdisc_ops *q, **qp;
133 int rc = -EEXIST;
134
135 write_lock(&qdisc_mod_lock);
136 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
137 if (!strcmp(qops->id, q->id))
138 goto out;
139
140 if (qops->enqueue == NULL)
141 qops->enqueue = noop_qdisc_ops.enqueue;
142 if (qops->peek == NULL) {
143 if (qops->dequeue == NULL)
144 qops->peek = noop_qdisc_ops.peek;
145 else
146 goto out_einval;
147 }
148 if (qops->dequeue == NULL)
149 qops->dequeue = noop_qdisc_ops.dequeue;
150
151 if (qops->cl_ops) {
152 const struct Qdisc_class_ops *cops = qops->cl_ops;
153
154 if (!(cops->find && cops->walk && cops->leaf))
155 goto out_einval;
156
157 if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf))
158 goto out_einval;
159 }
160
161 qops->next = NULL;
162 *qp = qops;
163 rc = 0;
164 out:
165 write_unlock(&qdisc_mod_lock);
166 return rc;
167
168 out_einval:
169 rc = -EINVAL;
170 goto out;
171 }
172 EXPORT_SYMBOL(register_qdisc);
173
174 int unregister_qdisc(struct Qdisc_ops *qops)
175 {
176 struct Qdisc_ops *q, **qp;
177 int err = -ENOENT;
178
179 write_lock(&qdisc_mod_lock);
180 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
181 if (q == qops)
182 break;
183 if (q) {
184 *qp = q->next;
185 q->next = NULL;
186 err = 0;
187 }
188 write_unlock(&qdisc_mod_lock);
189 return err;
190 }
191 EXPORT_SYMBOL(unregister_qdisc);
192
193 /* Get default qdisc if not otherwise specified */
194 void qdisc_get_default(char *name, size_t len)
195 {
196 read_lock(&qdisc_mod_lock);
197 strlcpy(name, default_qdisc_ops->id, len);
198 read_unlock(&qdisc_mod_lock);
199 }
200
201 static struct Qdisc_ops *qdisc_lookup_default(const char *name)
202 {
203 struct Qdisc_ops *q = NULL;
204
205 for (q = qdisc_base; q; q = q->next) {
206 if (!strcmp(name, q->id)) {
207 if (!try_module_get(q->owner))
208 q = NULL;
209 break;
210 }
211 }
212
213 return q;
214 }
215
216 /* Set new default qdisc to use */
217 int qdisc_set_default(const char *name)
218 {
219 const struct Qdisc_ops *ops;
220
221 if (!capable(CAP_NET_ADMIN))
222 return -EPERM;
223
224 write_lock(&qdisc_mod_lock);
225 ops = qdisc_lookup_default(name);
226 if (!ops) {
227 /* Not found, drop lock and try to load module */
228 write_unlock(&qdisc_mod_lock);
229 request_module("sch_%s", name);
230 write_lock(&qdisc_mod_lock);
231
232 ops = qdisc_lookup_default(name);
233 }
234
235 if (ops) {
236 /* Set new default */
237 module_put(default_qdisc_ops->owner);
238 default_qdisc_ops = ops;
239 }
240 write_unlock(&qdisc_mod_lock);
241
242 return ops ? 0 : -ENOENT;
243 }
244
245 #ifdef CONFIG_NET_SCH_DEFAULT
246 /* Set default value from kernel config */
247 static int __init sch_default_qdisc(void)
248 {
249 return qdisc_set_default(CONFIG_DEFAULT_NET_SCH);
250 }
251 late_initcall(sch_default_qdisc);
252 #endif
253
254 /* We know handle. Find qdisc among all qdisc's attached to device
255 * (root qdisc, all its children, children of children etc.)
256 * Note: caller either uses rtnl or rcu_read_lock()
257 */
258
259 static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
260 {
261 struct Qdisc *q;
262
263 if (!qdisc_dev(root))
264 return (root->handle == handle ? root : NULL);
265
266 if (!(root->flags & TCQ_F_BUILTIN) &&
267 root->handle == handle)
268 return root;
269
270 hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle,
271 lockdep_rtnl_is_held()) {
272 if (q->handle == handle)
273 return q;
274 }
275 return NULL;
276 }
277
278 void qdisc_hash_add(struct Qdisc *q, bool invisible)
279 {
280 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
281 ASSERT_RTNL();
282 hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle);
283 if (invisible)
284 q->flags |= TCQ_F_INVISIBLE;
285 }
286 }
287 EXPORT_SYMBOL(qdisc_hash_add);
288
289 void qdisc_hash_del(struct Qdisc *q)
290 {
291 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
292 ASSERT_RTNL();
293 hash_del_rcu(&q->hash);
294 }
295 }
296 EXPORT_SYMBOL(qdisc_hash_del);
297
298 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
299 {
300 struct Qdisc *q;
301
302 if (!handle)
303 return NULL;
304 q = qdisc_match_from_root(dev->qdisc, handle);
305 if (q)
306 goto out;
307
308 if (dev_ingress_queue(dev))
309 q = qdisc_match_from_root(
310 dev_ingress_queue(dev)->qdisc_sleeping,
311 handle);
312 out:
313 return q;
314 }
315
316 struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle)
317 {
318 struct netdev_queue *nq;
319 struct Qdisc *q;
320
321 if (!handle)
322 return NULL;
323 q = qdisc_match_from_root(dev->qdisc, handle);
324 if (q)
325 goto out;
326
327 nq = dev_ingress_queue_rcu(dev);
328 if (nq)
329 q = qdisc_match_from_root(nq->qdisc_sleeping, handle);
330 out:
331 return q;
332 }
333
334 static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
335 {
336 unsigned long cl;
337 const struct Qdisc_class_ops *cops = p->ops->cl_ops;
338
339 if (cops == NULL)
340 return NULL;
341 cl = cops->find(p, classid);
342
343 if (cl == 0)
344 return NULL;
345 return cops->leaf(p, cl);
346 }
347
348 /* Find queueing discipline by name */
349
350 static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
351 {
352 struct Qdisc_ops *q = NULL;
353
354 if (kind) {
355 read_lock(&qdisc_mod_lock);
356 for (q = qdisc_base; q; q = q->next) {
357 if (nla_strcmp(kind, q->id) == 0) {
358 if (!try_module_get(q->owner))
359 q = NULL;
360 break;
361 }
362 }
363 read_unlock(&qdisc_mod_lock);
364 }
365 return q;
366 }
367
368 /* The linklayer setting were not transferred from iproute2, in older
369 * versions, and the rate tables lookup systems have been dropped in
370 * the kernel. To keep backward compatible with older iproute2 tc
371 * utils, we detect the linklayer setting by detecting if the rate
372 * table were modified.
373 *
374 * For linklayer ATM table entries, the rate table will be aligned to
375 * 48 bytes, thus some table entries will contain the same value. The
376 * mpu (min packet unit) is also encoded into the old rate table, thus
377 * starting from the mpu, we find low and high table entries for
378 * mapping this cell. If these entries contain the same value, when
379 * the rate tables have been modified for linklayer ATM.
380 *
381 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
382 * and then roundup to the next cell, calc the table entry one below,
383 * and compare.
384 */
385 static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
386 {
387 int low = roundup(r->mpu, 48);
388 int high = roundup(low+1, 48);
389 int cell_low = low >> r->cell_log;
390 int cell_high = (high >> r->cell_log) - 1;
391
392 /* rtab is too inaccurate at rates > 100Mbit/s */
393 if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
394 pr_debug("TC linklayer: Giving up ATM detection\n");
395 return TC_LINKLAYER_ETHERNET;
396 }
397
398 if ((cell_high > cell_low) && (cell_high < 256)
399 && (rtab[cell_low] == rtab[cell_high])) {
400 pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
401 cell_low, cell_high, rtab[cell_high]);
402 return TC_LINKLAYER_ATM;
403 }
404 return TC_LINKLAYER_ETHERNET;
405 }
406
407 static struct qdisc_rate_table *qdisc_rtab_list;
408
409 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
410 struct nlattr *tab,
411 struct netlink_ext_ack *extack)
412 {
413 struct qdisc_rate_table *rtab;
414
415 if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
416 nla_len(tab) != TC_RTAB_SIZE) {
417 NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching");
418 return NULL;
419 }
420
421 for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
422 if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) &&
423 !memcmp(&rtab->data, nla_data(tab), 1024)) {
424 rtab->refcnt++;
425 return rtab;
426 }
427 }
428
429 rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
430 if (rtab) {
431 rtab->rate = *r;
432 rtab->refcnt = 1;
433 memcpy(rtab->data, nla_data(tab), 1024);
434 if (r->linklayer == TC_LINKLAYER_UNAWARE)
435 r->linklayer = __detect_linklayer(r, rtab->data);
436 rtab->next = qdisc_rtab_list;
437 qdisc_rtab_list = rtab;
438 } else {
439 NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table");
440 }
441 return rtab;
442 }
443 EXPORT_SYMBOL(qdisc_get_rtab);
444
445 void qdisc_put_rtab(struct qdisc_rate_table *tab)
446 {
447 struct qdisc_rate_table *rtab, **rtabp;
448
449 if (!tab || --tab->refcnt)
450 return;
451
452 for (rtabp = &qdisc_rtab_list;
453 (rtab = *rtabp) != NULL;
454 rtabp = &rtab->next) {
455 if (rtab == tab) {
456 *rtabp = rtab->next;
457 kfree(rtab);
458 return;
459 }
460 }
461 }
462 EXPORT_SYMBOL(qdisc_put_rtab);
463
464 static LIST_HEAD(qdisc_stab_list);
465
466 static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
467 [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
468 [TCA_STAB_DATA] = { .type = NLA_BINARY },
469 };
470
471 static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt,
472 struct netlink_ext_ack *extack)
473 {
474 struct nlattr *tb[TCA_STAB_MAX + 1];
475 struct qdisc_size_table *stab;
476 struct tc_sizespec *s;
477 unsigned int tsize = 0;
478 u16 *tab = NULL;
479 int err;
480
481 err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy,
482 extack);
483 if (err < 0)
484 return ERR_PTR(err);
485 if (!tb[TCA_STAB_BASE]) {
486 NL_SET_ERR_MSG(extack, "Size table base attribute is missing");
487 return ERR_PTR(-EINVAL);
488 }
489
490 s = nla_data(tb[TCA_STAB_BASE]);
491
492 if (s->tsize > 0) {
493 if (!tb[TCA_STAB_DATA]) {
494 NL_SET_ERR_MSG(extack, "Size table data attribute is missing");
495 return ERR_PTR(-EINVAL);
496 }
497 tab = nla_data(tb[TCA_STAB_DATA]);
498 tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
499 }
500
501 if (tsize != s->tsize || (!tab && tsize > 0)) {
502 NL_SET_ERR_MSG(extack, "Invalid size of size table");
503 return ERR_PTR(-EINVAL);
504 }
505
506 list_for_each_entry(stab, &qdisc_stab_list, list) {
507 if (memcmp(&stab->szopts, s, sizeof(*s)))
508 continue;
509 if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
510 continue;
511 stab->refcnt++;
512 return stab;
513 }
514
515 stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
516 if (!stab)
517 return ERR_PTR(-ENOMEM);
518
519 stab->refcnt = 1;
520 stab->szopts = *s;
521 if (tsize > 0)
522 memcpy(stab->data, tab, tsize * sizeof(u16));
523
524 list_add_tail(&stab->list, &qdisc_stab_list);
525
526 return stab;
527 }
528
529 void qdisc_put_stab(struct qdisc_size_table *tab)
530 {
531 if (!tab)
532 return;
533
534 if (--tab->refcnt == 0) {
535 list_del(&tab->list);
536 kfree_rcu(tab, rcu);
537 }
538 }
539 EXPORT_SYMBOL(qdisc_put_stab);
540
541 static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
542 {
543 struct nlattr *nest;
544
545 nest = nla_nest_start_noflag(skb, TCA_STAB);
546 if (nest == NULL)
547 goto nla_put_failure;
548 if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
549 goto nla_put_failure;
550 nla_nest_end(skb, nest);
551
552 return skb->len;
553
554 nla_put_failure:
555 return -1;
556 }
557
558 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
559 const struct qdisc_size_table *stab)
560 {
561 int pkt_len, slot;
562
563 pkt_len = skb->len + stab->szopts.overhead;
564 if (unlikely(!stab->szopts.tsize))
565 goto out;
566
567 slot = pkt_len + stab->szopts.cell_align;
568 if (unlikely(slot < 0))
569 slot = 0;
570
571 slot >>= stab->szopts.cell_log;
572 if (likely(slot < stab->szopts.tsize))
573 pkt_len = stab->data[slot];
574 else
575 pkt_len = stab->data[stab->szopts.tsize - 1] *
576 (slot / stab->szopts.tsize) +
577 stab->data[slot % stab->szopts.tsize];
578
579 pkt_len <<= stab->szopts.size_log;
580 out:
581 if (unlikely(pkt_len < 1))
582 pkt_len = 1;
583 qdisc_skb_cb(skb)->pkt_len = pkt_len;
584 }
585 EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
586
587 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc)
588 {
589 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
590 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
591 txt, qdisc->ops->id, qdisc->handle >> 16);
592 qdisc->flags |= TCQ_F_WARN_NONWC;
593 }
594 }
595 EXPORT_SYMBOL(qdisc_warn_nonwc);
596
597 static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
598 {
599 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
600 timer);
601
602 rcu_read_lock();
603 __netif_schedule(qdisc_root(wd->qdisc));
604 rcu_read_unlock();
605
606 return HRTIMER_NORESTART;
607 }
608
609 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
610 clockid_t clockid)
611 {
612 hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED);
613 wd->timer.function = qdisc_watchdog;
614 wd->qdisc = qdisc;
615 }
616 EXPORT_SYMBOL(qdisc_watchdog_init_clockid);
617
618 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
619 {
620 qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC);
621 }
622 EXPORT_SYMBOL(qdisc_watchdog_init);
623
624 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
625 u64 delta_ns)
626 {
627 if (test_bit(__QDISC_STATE_DEACTIVATED,
628 &qdisc_root_sleeping(wd->qdisc)->state))
629 return;
630
631 if (hrtimer_is_queued(&wd->timer)) {
632 /* If timer is already set in [expires, expires + delta_ns],
633 * do not reprogram it.
634 */
635 if (wd->last_expires - expires <= delta_ns)
636 return;
637 }
638
639 wd->last_expires = expires;
640 hrtimer_start_range_ns(&wd->timer,
641 ns_to_ktime(expires),
642 delta_ns,
643 HRTIMER_MODE_ABS_PINNED);
644 }
645 EXPORT_SYMBOL(qdisc_watchdog_schedule_range_ns);
646
647 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
648 {
649 hrtimer_cancel(&wd->timer);
650 }
651 EXPORT_SYMBOL(qdisc_watchdog_cancel);
652
653 static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
654 {
655 struct hlist_head *h;
656 unsigned int i;
657
658 h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL);
659
660 if (h != NULL) {
661 for (i = 0; i < n; i++)
662 INIT_HLIST_HEAD(&h[i]);
663 }
664 return h;
665 }
666
667 void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
668 {
669 struct Qdisc_class_common *cl;
670 struct hlist_node *next;
671 struct hlist_head *nhash, *ohash;
672 unsigned int nsize, nmask, osize;
673 unsigned int i, h;
674
675 /* Rehash when load factor exceeds 0.75 */
676 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
677 return;
678 nsize = clhash->hashsize * 2;
679 nmask = nsize - 1;
680 nhash = qdisc_class_hash_alloc(nsize);
681 if (nhash == NULL)
682 return;
683
684 ohash = clhash->hash;
685 osize = clhash->hashsize;
686
687 sch_tree_lock(sch);
688 for (i = 0; i < osize; i++) {
689 hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
690 h = qdisc_class_hash(cl->classid, nmask);
691 hlist_add_head(&cl->hnode, &nhash[h]);
692 }
693 }
694 clhash->hash = nhash;
695 clhash->hashsize = nsize;
696 clhash->hashmask = nmask;
697 sch_tree_unlock(sch);
698
699 kvfree(ohash);
700 }
701 EXPORT_SYMBOL(qdisc_class_hash_grow);
702
703 int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
704 {
705 unsigned int size = 4;
706
707 clhash->hash = qdisc_class_hash_alloc(size);
708 if (!clhash->hash)
709 return -ENOMEM;
710 clhash->hashsize = size;
711 clhash->hashmask = size - 1;
712 clhash->hashelems = 0;
713 return 0;
714 }
715 EXPORT_SYMBOL(qdisc_class_hash_init);
716
717 void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
718 {
719 kvfree(clhash->hash);
720 }
721 EXPORT_SYMBOL(qdisc_class_hash_destroy);
722
723 void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
724 struct Qdisc_class_common *cl)
725 {
726 unsigned int h;
727
728 INIT_HLIST_NODE(&cl->hnode);
729 h = qdisc_class_hash(cl->classid, clhash->hashmask);
730 hlist_add_head(&cl->hnode, &clhash->hash[h]);
731 clhash->hashelems++;
732 }
733 EXPORT_SYMBOL(qdisc_class_hash_insert);
734
735 void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
736 struct Qdisc_class_common *cl)
737 {
738 hlist_del(&cl->hnode);
739 clhash->hashelems--;
740 }
741 EXPORT_SYMBOL(qdisc_class_hash_remove);
742
743 /* Allocate an unique handle from space managed by kernel
744 * Possible range is [8000-FFFF]:0000 (0x8000 values)
745 */
746 static u32 qdisc_alloc_handle(struct net_device *dev)
747 {
748 int i = 0x8000;
749 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
750
751 do {
752 autohandle += TC_H_MAKE(0x10000U, 0);
753 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
754 autohandle = TC_H_MAKE(0x80000000U, 0);
755 if (!qdisc_lookup(dev, autohandle))
756 return autohandle;
757 cond_resched();
758 } while (--i > 0);
759
760 return 0;
761 }
762
763 void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len)
764 {
765 bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED;
766 const struct Qdisc_class_ops *cops;
767 unsigned long cl;
768 u32 parentid;
769 bool notify;
770 int drops;
771
772 if (n == 0 && len == 0)
773 return;
774 drops = max_t(int, n, 0);
775 rcu_read_lock();
776 while ((parentid = sch->parent)) {
777 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
778 break;
779
780 if (sch->flags & TCQ_F_NOPARENT)
781 break;
782 /* Notify parent qdisc only if child qdisc becomes empty.
783 *
784 * If child was empty even before update then backlog
785 * counter is screwed and we skip notification because
786 * parent class is already passive.
787 *
788 * If the original child was offloaded then it is allowed
789 * to be seem as empty, so the parent is notified anyway.
790 */
791 notify = !sch->q.qlen && !WARN_ON_ONCE(!n &&
792 !qdisc_is_offloaded);
793 /* TODO: perform the search on a per txq basis */
794 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
795 if (sch == NULL) {
796 WARN_ON_ONCE(parentid != TC_H_ROOT);
797 break;
798 }
799 cops = sch->ops->cl_ops;
800 if (notify && cops->qlen_notify) {
801 cl = cops->find(sch, parentid);
802 cops->qlen_notify(sch, cl);
803 }
804 sch->q.qlen -= n;
805 sch->qstats.backlog -= len;
806 __qdisc_qstats_drop(sch, drops);
807 }
808 rcu_read_unlock();
809 }
810 EXPORT_SYMBOL(qdisc_tree_reduce_backlog);
811
812 int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type,
813 void *type_data)
814 {
815 struct net_device *dev = qdisc_dev(sch);
816 int err;
817
818 sch->flags &= ~TCQ_F_OFFLOADED;
819 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
820 return 0;
821
822 err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
823 if (err == -EOPNOTSUPP)
824 return 0;
825
826 if (!err)
827 sch->flags |= TCQ_F_OFFLOADED;
828
829 return err;
830 }
831 EXPORT_SYMBOL(qdisc_offload_dump_helper);
832
833 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
834 struct Qdisc *new, struct Qdisc *old,
835 enum tc_setup_type type, void *type_data,
836 struct netlink_ext_ack *extack)
837 {
838 bool any_qdisc_is_offloaded;
839 int err;
840
841 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
842 return;
843
844 err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
845
846 /* Don't report error if the graft is part of destroy operation. */
847 if (!err || !new || new == &noop_qdisc)
848 return;
849
850 /* Don't report error if the parent, the old child and the new
851 * one are not offloaded.
852 */
853 any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED;
854 any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED;
855 any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED;
856
857 if (any_qdisc_is_offloaded)
858 NL_SET_ERR_MSG(extack, "Offloading graft operation failed.");
859 }
860 EXPORT_SYMBOL(qdisc_offload_graft_helper);
861
862 static void qdisc_offload_graft_root(struct net_device *dev,
863 struct Qdisc *new, struct Qdisc *old,
864 struct netlink_ext_ack *extack)
865 {
866 struct tc_root_qopt_offload graft_offload = {
867 .command = TC_ROOT_GRAFT,
868 .handle = new ? new->handle : 0,
869 .ingress = (new && new->flags & TCQ_F_INGRESS) ||
870 (old && old->flags & TCQ_F_INGRESS),
871 };
872
873 qdisc_offload_graft_helper(dev, NULL, new, old,
874 TC_SETUP_ROOT_QDISC, &graft_offload, extack);
875 }
876
877 static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
878 u32 portid, u32 seq, u16 flags, int event)
879 {
880 struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
881 struct gnet_stats_queue __percpu *cpu_qstats = NULL;
882 struct tcmsg *tcm;
883 struct nlmsghdr *nlh;
884 unsigned char *b = skb_tail_pointer(skb);
885 struct gnet_dump d;
886 struct qdisc_size_table *stab;
887 u32 block_index;
888 __u32 qlen;
889
890 cond_resched();
891 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
892 if (!nlh)
893 goto out_nlmsg_trim;
894 tcm = nlmsg_data(nlh);
895 tcm->tcm_family = AF_UNSPEC;
896 tcm->tcm__pad1 = 0;
897 tcm->tcm__pad2 = 0;
898 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
899 tcm->tcm_parent = clid;
900 tcm->tcm_handle = q->handle;
901 tcm->tcm_info = refcount_read(&q->refcnt);
902 if (nla_put_string(skb, TCA_KIND, q->ops->id))
903 goto nla_put_failure;
904 if (q->ops->ingress_block_get) {
905 block_index = q->ops->ingress_block_get(q);
906 if (block_index &&
907 nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index))
908 goto nla_put_failure;
909 }
910 if (q->ops->egress_block_get) {
911 block_index = q->ops->egress_block_get(q);
912 if (block_index &&
913 nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index))
914 goto nla_put_failure;
915 }
916 if (q->ops->dump && q->ops->dump(q, skb) < 0)
917 goto nla_put_failure;
918 if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED)))
919 goto nla_put_failure;
920 qlen = qdisc_qlen_sum(q);
921
922 stab = rtnl_dereference(q->stab);
923 if (stab && qdisc_dump_stab(skb, stab) < 0)
924 goto nla_put_failure;
925
926 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
927 NULL, &d, TCA_PAD) < 0)
928 goto nla_put_failure;
929
930 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
931 goto nla_put_failure;
932
933 if (qdisc_is_percpu_stats(q)) {
934 cpu_bstats = q->cpu_bstats;
935 cpu_qstats = q->cpu_qstats;
936 }
937
938 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q),
939 &d, cpu_bstats, &q->bstats) < 0 ||
940 gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
941 gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0)
942 goto nla_put_failure;
943
944 if (gnet_stats_finish_copy(&d) < 0)
945 goto nla_put_failure;
946
947 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
948 return skb->len;
949
950 out_nlmsg_trim:
951 nla_put_failure:
952 nlmsg_trim(skb, b);
953 return -1;
954 }
955
956 static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible)
957 {
958 if (q->flags & TCQ_F_BUILTIN)
959 return true;
960 if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible)
961 return true;
962
963 return false;
964 }
965
966 static int qdisc_notify(struct net *net, struct sk_buff *oskb,
967 struct nlmsghdr *n, u32 clid,
968 struct Qdisc *old, struct Qdisc *new)
969 {
970 struct sk_buff *skb;
971 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
972
973 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
974 if (!skb)
975 return -ENOBUFS;
976
977 if (old && !tc_qdisc_dump_ignore(old, false)) {
978 if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
979 0, RTM_DELQDISC) < 0)
980 goto err_out;
981 }
982 if (new && !tc_qdisc_dump_ignore(new, false)) {
983 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
984 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
985 goto err_out;
986 }
987
988 if (skb->len)
989 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
990 n->nlmsg_flags & NLM_F_ECHO);
991
992 err_out:
993 kfree_skb(skb);
994 return -EINVAL;
995 }
996
997 static void notify_and_destroy(struct net *net, struct sk_buff *skb,
998 struct nlmsghdr *n, u32 clid,
999 struct Qdisc *old, struct Qdisc *new)
1000 {
1001 if (new || old)
1002 qdisc_notify(net, skb, n, clid, old, new);
1003
1004 if (old)
1005 qdisc_put(old);
1006 }
1007
1008 static void qdisc_clear_nolock(struct Qdisc *sch)
1009 {
1010 sch->flags &= ~TCQ_F_NOLOCK;
1011 if (!(sch->flags & TCQ_F_CPUSTATS))
1012 return;
1013
1014 free_percpu(sch->cpu_bstats);
1015 free_percpu(sch->cpu_qstats);
1016 sch->cpu_bstats = NULL;
1017 sch->cpu_qstats = NULL;
1018 sch->flags &= ~TCQ_F_CPUSTATS;
1019 }
1020
1021 /* Graft qdisc "new" to class "classid" of qdisc "parent" or
1022 * to device "dev".
1023 *
1024 * When appropriate send a netlink notification using 'skb'
1025 * and "n".
1026 *
1027 * On success, destroy old qdisc.
1028 */
1029
1030 static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
1031 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
1032 struct Qdisc *new, struct Qdisc *old,
1033 struct netlink_ext_ack *extack)
1034 {
1035 struct Qdisc *q = old;
1036 struct net *net = dev_net(dev);
1037
1038 if (parent == NULL) {
1039 unsigned int i, num_q, ingress;
1040
1041 ingress = 0;
1042 num_q = dev->num_tx_queues;
1043 if ((q && q->flags & TCQ_F_INGRESS) ||
1044 (new && new->flags & TCQ_F_INGRESS)) {
1045 num_q = 1;
1046 ingress = 1;
1047 if (!dev_ingress_queue(dev)) {
1048 NL_SET_ERR_MSG(extack, "Device does not have an ingress queue");
1049 return -ENOENT;
1050 }
1051 }
1052
1053 if (dev->flags & IFF_UP)
1054 dev_deactivate(dev);
1055
1056 qdisc_offload_graft_root(dev, new, old, extack);
1057
1058 if (new && new->ops->attach)
1059 goto skip;
1060
1061 for (i = 0; i < num_q; i++) {
1062 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
1063
1064 if (!ingress)
1065 dev_queue = netdev_get_tx_queue(dev, i);
1066
1067 old = dev_graft_qdisc(dev_queue, new);
1068 if (new && i > 0)
1069 qdisc_refcount_inc(new);
1070
1071 if (!ingress)
1072 qdisc_put(old);
1073 }
1074
1075 skip:
1076 if (!ingress) {
1077 notify_and_destroy(net, skb, n, classid,
1078 dev->qdisc, new);
1079 if (new && !new->ops->attach)
1080 qdisc_refcount_inc(new);
1081 dev->qdisc = new ? : &noop_qdisc;
1082
1083 if (new && new->ops->attach)
1084 new->ops->attach(new);
1085 } else {
1086 notify_and_destroy(net, skb, n, classid, old, new);
1087 }
1088
1089 if (dev->flags & IFF_UP)
1090 dev_activate(dev);
1091 } else {
1092 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
1093 unsigned long cl;
1094 int err;
1095
1096 /* Only support running class lockless if parent is lockless */
1097 if (new && (new->flags & TCQ_F_NOLOCK) && !(parent->flags & TCQ_F_NOLOCK))
1098 qdisc_clear_nolock(new);
1099
1100 if (!cops || !cops->graft)
1101 return -EOPNOTSUPP;
1102
1103 cl = cops->find(parent, classid);
1104 if (!cl) {
1105 NL_SET_ERR_MSG(extack, "Specified class not found");
1106 return -ENOENT;
1107 }
1108
1109 err = cops->graft(parent, cl, new, &old, extack);
1110 if (err)
1111 return err;
1112 notify_and_destroy(net, skb, n, classid, old, new);
1113 }
1114 return 0;
1115 }
1116
1117 static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca,
1118 struct netlink_ext_ack *extack)
1119 {
1120 u32 block_index;
1121
1122 if (tca[TCA_INGRESS_BLOCK]) {
1123 block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]);
1124
1125 if (!block_index) {
1126 NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0");
1127 return -EINVAL;
1128 }
1129 if (!sch->ops->ingress_block_set) {
1130 NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported");
1131 return -EOPNOTSUPP;
1132 }
1133 sch->ops->ingress_block_set(sch, block_index);
1134 }
1135 if (tca[TCA_EGRESS_BLOCK]) {
1136 block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]);
1137
1138 if (!block_index) {
1139 NL_SET_ERR_MSG(extack, "Egress block index cannot be 0");
1140 return -EINVAL;
1141 }
1142 if (!sch->ops->egress_block_set) {
1143 NL_SET_ERR_MSG(extack, "Egress block sharing is not supported");
1144 return -EOPNOTSUPP;
1145 }
1146 sch->ops->egress_block_set(sch, block_index);
1147 }
1148 return 0;
1149 }
1150
1151 /*
1152 Allocate and initialize new qdisc.
1153
1154 Parameters are passed via opt.
1155 */
1156
1157 static struct Qdisc *qdisc_create(struct net_device *dev,
1158 struct netdev_queue *dev_queue,
1159 struct Qdisc *p, u32 parent, u32 handle,
1160 struct nlattr **tca, int *errp,
1161 struct netlink_ext_ack *extack)
1162 {
1163 int err;
1164 struct nlattr *kind = tca[TCA_KIND];
1165 struct Qdisc *sch;
1166 struct Qdisc_ops *ops;
1167 struct qdisc_size_table *stab;
1168
1169 ops = qdisc_lookup_ops(kind);
1170 #ifdef CONFIG_MODULES
1171 if (ops == NULL && kind != NULL) {
1172 char name[IFNAMSIZ];
1173 if (nla_strscpy(name, kind, IFNAMSIZ) >= 0) {
1174 /* We dropped the RTNL semaphore in order to
1175 * perform the module load. So, even if we
1176 * succeeded in loading the module we have to
1177 * tell the caller to replay the request. We
1178 * indicate this using -EAGAIN.
1179 * We replay the request because the device may
1180 * go away in the mean time.
1181 */
1182 rtnl_unlock();
1183 request_module("sch_%s", name);
1184 rtnl_lock();
1185 ops = qdisc_lookup_ops(kind);
1186 if (ops != NULL) {
1187 /* We will try again qdisc_lookup_ops,
1188 * so don't keep a reference.
1189 */
1190 module_put(ops->owner);
1191 err = -EAGAIN;
1192 goto err_out;
1193 }
1194 }
1195 }
1196 #endif
1197
1198 err = -ENOENT;
1199 if (!ops) {
1200 NL_SET_ERR_MSG(extack, "Specified qdisc not found");
1201 goto err_out;
1202 }
1203
1204 sch = qdisc_alloc(dev_queue, ops, extack);
1205 if (IS_ERR(sch)) {
1206 err = PTR_ERR(sch);
1207 goto err_out2;
1208 }
1209
1210 sch->parent = parent;
1211
1212 if (handle == TC_H_INGRESS) {
1213 sch->flags |= TCQ_F_INGRESS;
1214 handle = TC_H_MAKE(TC_H_INGRESS, 0);
1215 } else {
1216 if (handle == 0) {
1217 handle = qdisc_alloc_handle(dev);
1218 if (handle == 0) {
1219 NL_SET_ERR_MSG(extack, "Maximum number of qdisc handles was exceeded");
1220 err = -ENOSPC;
1221 goto err_out3;
1222 }
1223 }
1224 if (!netif_is_multiqueue(dev))
1225 sch->flags |= TCQ_F_ONETXQUEUE;
1226 }
1227
1228 sch->handle = handle;
1229
1230 /* This exist to keep backward compatible with a userspace
1231 * loophole, what allowed userspace to get IFF_NO_QUEUE
1232 * facility on older kernels by setting tx_queue_len=0 (prior
1233 * to qdisc init), and then forgot to reinit tx_queue_len
1234 * before again attaching a qdisc.
1235 */
1236 if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) {
1237 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
1238 netdev_info(dev, "Caught tx_queue_len zero misconfig\n");
1239 }
1240
1241 err = qdisc_block_indexes_set(sch, tca, extack);
1242 if (err)
1243 goto err_out3;
1244
1245 if (ops->init) {
1246 err = ops->init(sch, tca[TCA_OPTIONS], extack);
1247 if (err != 0)
1248 goto err_out5;
1249 }
1250
1251 if (tca[TCA_STAB]) {
1252 stab = qdisc_get_stab(tca[TCA_STAB], extack);
1253 if (IS_ERR(stab)) {
1254 err = PTR_ERR(stab);
1255 goto err_out4;
1256 }
1257 rcu_assign_pointer(sch->stab, stab);
1258 }
1259 if (tca[TCA_RATE]) {
1260 seqcount_t *running;
1261
1262 err = -EOPNOTSUPP;
1263 if (sch->flags & TCQ_F_MQROOT) {
1264 NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc");
1265 goto err_out4;
1266 }
1267
1268 if (sch->parent != TC_H_ROOT &&
1269 !(sch->flags & TCQ_F_INGRESS) &&
1270 (!p || !(p->flags & TCQ_F_MQROOT)))
1271 running = qdisc_root_sleeping_running(sch);
1272 else
1273 running = &sch->running;
1274
1275 err = gen_new_estimator(&sch->bstats,
1276 sch->cpu_bstats,
1277 &sch->rate_est,
1278 NULL,
1279 running,
1280 tca[TCA_RATE]);
1281 if (err) {
1282 NL_SET_ERR_MSG(extack, "Failed to generate new estimator");
1283 goto err_out4;
1284 }
1285 }
1286
1287 qdisc_hash_add(sch, false);
1288 trace_qdisc_create(ops, dev, parent);
1289
1290 return sch;
1291
1292 err_out5:
1293 /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */
1294 if (ops->destroy)
1295 ops->destroy(sch);
1296 err_out3:
1297 dev_put(dev);
1298 qdisc_free(sch);
1299 err_out2:
1300 module_put(ops->owner);
1301 err_out:
1302 *errp = err;
1303 return NULL;
1304
1305 err_out4:
1306 /*
1307 * Any broken qdiscs that would require a ops->reset() here?
1308 * The qdisc was never in action so it shouldn't be necessary.
1309 */
1310 qdisc_put_stab(rtnl_dereference(sch->stab));
1311 if (ops->destroy)
1312 ops->destroy(sch);
1313 goto err_out3;
1314 }
1315
1316 static int qdisc_change(struct Qdisc *sch, struct nlattr **tca,
1317 struct netlink_ext_ack *extack)
1318 {
1319 struct qdisc_size_table *ostab, *stab = NULL;
1320 int err = 0;
1321
1322 if (tca[TCA_OPTIONS]) {
1323 if (!sch->ops->change) {
1324 NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc");
1325 return -EINVAL;
1326 }
1327 if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
1328 NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
1329 return -EOPNOTSUPP;
1330 }
1331 err = sch->ops->change(sch, tca[TCA_OPTIONS], extack);
1332 if (err)
1333 return err;
1334 }
1335
1336 if (tca[TCA_STAB]) {
1337 stab = qdisc_get_stab(tca[TCA_STAB], extack);
1338 if (IS_ERR(stab))
1339 return PTR_ERR(stab);
1340 }
1341
1342 ostab = rtnl_dereference(sch->stab);
1343 rcu_assign_pointer(sch->stab, stab);
1344 qdisc_put_stab(ostab);
1345
1346 if (tca[TCA_RATE]) {
1347 /* NB: ignores errors from replace_estimator
1348 because change can't be undone. */
1349 if (sch->flags & TCQ_F_MQROOT)
1350 goto out;
1351 gen_replace_estimator(&sch->bstats,
1352 sch->cpu_bstats,
1353 &sch->rate_est,
1354 NULL,
1355 qdisc_root_sleeping_running(sch),
1356 tca[TCA_RATE]);
1357 }
1358 out:
1359 return 0;
1360 }
1361
1362 struct check_loop_arg {
1363 struct qdisc_walker w;
1364 struct Qdisc *p;
1365 int depth;
1366 };
1367
1368 static int check_loop_fn(struct Qdisc *q, unsigned long cl,
1369 struct qdisc_walker *w);
1370
1371 static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
1372 {
1373 struct check_loop_arg arg;
1374
1375 if (q->ops->cl_ops == NULL)
1376 return 0;
1377
1378 arg.w.stop = arg.w.skip = arg.w.count = 0;
1379 arg.w.fn = check_loop_fn;
1380 arg.depth = depth;
1381 arg.p = p;
1382 q->ops->cl_ops->walk(q, &arg.w);
1383 return arg.w.stop ? -ELOOP : 0;
1384 }
1385
1386 static int
1387 check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
1388 {
1389 struct Qdisc *leaf;
1390 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1391 struct check_loop_arg *arg = (struct check_loop_arg *)w;
1392
1393 leaf = cops->leaf(q, cl);
1394 if (leaf) {
1395 if (leaf == arg->p || arg->depth > 7)
1396 return -ELOOP;
1397 return check_loop(leaf, arg->p, arg->depth + 1);
1398 }
1399 return 0;
1400 }
1401
1402 const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = {
1403 [TCA_KIND] = { .type = NLA_STRING },
1404 [TCA_RATE] = { .type = NLA_BINARY,
1405 .len = sizeof(struct tc_estimator) },
1406 [TCA_STAB] = { .type = NLA_NESTED },
1407 [TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG },
1408 [TCA_CHAIN] = { .type = NLA_U32 },
1409 [TCA_INGRESS_BLOCK] = { .type = NLA_U32 },
1410 [TCA_EGRESS_BLOCK] = { .type = NLA_U32 },
1411 };
1412
1413 /*
1414 * Delete/get qdisc.
1415 */
1416
1417 static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
1418 struct netlink_ext_ack *extack)
1419 {
1420 struct net *net = sock_net(skb->sk);
1421 struct tcmsg *tcm = nlmsg_data(n);
1422 struct nlattr *tca[TCA_MAX + 1];
1423 struct net_device *dev;
1424 u32 clid;
1425 struct Qdisc *q = NULL;
1426 struct Qdisc *p = NULL;
1427 int err;
1428
1429 if ((n->nlmsg_type != RTM_GETQDISC) &&
1430 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1431 return -EPERM;
1432
1433 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
1434 rtm_tca_policy, extack);
1435 if (err < 0)
1436 return err;
1437
1438 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1439 if (!dev)
1440 return -ENODEV;
1441
1442 clid = tcm->tcm_parent;
1443 if (clid) {
1444 if (clid != TC_H_ROOT) {
1445 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
1446 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1447 if (!p) {
1448 NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid");
1449 return -ENOENT;
1450 }
1451 q = qdisc_leaf(p, clid);
1452 } else if (dev_ingress_queue(dev)) {
1453 q = dev_ingress_queue(dev)->qdisc_sleeping;
1454 }
1455 } else {
1456 q = dev->qdisc;
1457 }
1458 if (!q) {
1459 NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device");
1460 return -ENOENT;
1461 }
1462
1463 if (tcm->tcm_handle && q->handle != tcm->tcm_handle) {
1464 NL_SET_ERR_MSG(extack, "Invalid handle");
1465 return -EINVAL;
1466 }
1467 } else {
1468 q = qdisc_lookup(dev, tcm->tcm_handle);
1469 if (!q) {
1470 NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle");
1471 return -ENOENT;
1472 }
1473 }
1474
1475 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1476 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1477 return -EINVAL;
1478 }
1479
1480 if (n->nlmsg_type == RTM_DELQDISC) {
1481 if (!clid) {
1482 NL_SET_ERR_MSG(extack, "Classid cannot be zero");
1483 return -EINVAL;
1484 }
1485 if (q->handle == 0) {
1486 NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero");
1487 return -ENOENT;
1488 }
1489 err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack);
1490 if (err != 0)
1491 return err;
1492 } else {
1493 qdisc_notify(net, skb, n, clid, NULL, q);
1494 }
1495 return 0;
1496 }
1497
1498 /*
1499 * Create/change qdisc.
1500 */
1501
1502 static int tc_modify_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;
1507 struct nlattr *tca[TCA_MAX + 1];
1508 struct net_device *dev;
1509 u32 clid;
1510 struct Qdisc *q, *p;
1511 int err;
1512
1513 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1514 return -EPERM;
1515
1516 replay:
1517 /* Reinit, just in case something touches this. */
1518 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
1519 rtm_tca_policy, extack);
1520 if (err < 0)
1521 return err;
1522
1523 tcm = nlmsg_data(n);
1524 clid = tcm->tcm_parent;
1525 q = p = NULL;
1526
1527 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1528 if (!dev)
1529 return -ENODEV;
1530
1531
1532 if (clid) {
1533 if (clid != TC_H_ROOT) {
1534 if (clid != TC_H_INGRESS) {
1535 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1536 if (!p) {
1537 NL_SET_ERR_MSG(extack, "Failed to find specified qdisc");
1538 return -ENOENT;
1539 }
1540 q = qdisc_leaf(p, clid);
1541 } else if (dev_ingress_queue_create(dev)) {
1542 q = dev_ingress_queue(dev)->qdisc_sleeping;
1543 }
1544 } else {
1545 q = dev->qdisc;
1546 }
1547
1548 /* It may be default qdisc, ignore it */
1549 if (q && q->handle == 0)
1550 q = NULL;
1551
1552 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1553 if (tcm->tcm_handle) {
1554 if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) {
1555 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override");
1556 return -EEXIST;
1557 }
1558 if (TC_H_MIN(tcm->tcm_handle)) {
1559 NL_SET_ERR_MSG(extack, "Invalid minor handle");
1560 return -EINVAL;
1561 }
1562 q = qdisc_lookup(dev, tcm->tcm_handle);
1563 if (!q)
1564 goto create_n_graft;
1565 if (n->nlmsg_flags & NLM_F_EXCL) {
1566 NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override");
1567 return -EEXIST;
1568 }
1569 if (tca[TCA_KIND] &&
1570 nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1571 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1572 return -EINVAL;
1573 }
1574 if (q == p ||
1575 (p && check_loop(q, p, 0))) {
1576 NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected");
1577 return -ELOOP;
1578 }
1579 qdisc_refcount_inc(q);
1580 goto graft;
1581 } else {
1582 if (!q)
1583 goto create_n_graft;
1584
1585 /* This magic test requires explanation.
1586 *
1587 * We know, that some child q is already
1588 * attached to this parent and have choice:
1589 * either to change it or to create/graft new one.
1590 *
1591 * 1. We are allowed to create/graft only
1592 * if CREATE and REPLACE flags are set.
1593 *
1594 * 2. If EXCL is set, requestor wanted to say,
1595 * that qdisc tcm_handle is not expected
1596 * to exist, so that we choose create/graft too.
1597 *
1598 * 3. The last case is when no flags are set.
1599 * Alas, it is sort of hole in API, we
1600 * cannot decide what to do unambiguously.
1601 * For now we select create/graft, if
1602 * user gave KIND, which does not match existing.
1603 */
1604 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1605 (n->nlmsg_flags & NLM_F_REPLACE) &&
1606 ((n->nlmsg_flags & NLM_F_EXCL) ||
1607 (tca[TCA_KIND] &&
1608 nla_strcmp(tca[TCA_KIND], q->ops->id))))
1609 goto create_n_graft;
1610 }
1611 }
1612 } else {
1613 if (!tcm->tcm_handle) {
1614 NL_SET_ERR_MSG(extack, "Handle cannot be zero");
1615 return -EINVAL;
1616 }
1617 q = qdisc_lookup(dev, tcm->tcm_handle);
1618 }
1619
1620 /* Change qdisc parameters */
1621 if (!q) {
1622 NL_SET_ERR_MSG(extack, "Specified qdisc not found");
1623 return -ENOENT;
1624 }
1625 if (n->nlmsg_flags & NLM_F_EXCL) {
1626 NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify");
1627 return -EEXIST;
1628 }
1629 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
1630 NL_SET_ERR_MSG(extack, "Invalid qdisc name");
1631 return -EINVAL;
1632 }
1633 err = qdisc_change(q, tca, extack);
1634 if (err == 0)
1635 qdisc_notify(net, skb, n, clid, NULL, q);
1636 return err;
1637
1638 create_n_graft:
1639 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1640 NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag");
1641 return -ENOENT;
1642 }
1643 if (clid == TC_H_INGRESS) {
1644 if (dev_ingress_queue(dev)) {
1645 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1646 tcm->tcm_parent, tcm->tcm_parent,
1647 tca, &err, extack);
1648 } else {
1649 NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device");
1650 err = -ENOENT;
1651 }
1652 } else {
1653 struct netdev_queue *dev_queue;
1654
1655 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1656 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1657 else if (p)
1658 dev_queue = p->dev_queue;
1659 else
1660 dev_queue = netdev_get_tx_queue(dev, 0);
1661
1662 q = qdisc_create(dev, dev_queue, p,
1663 tcm->tcm_parent, tcm->tcm_handle,
1664 tca, &err, extack);
1665 }
1666 if (q == NULL) {
1667 if (err == -EAGAIN)
1668 goto replay;
1669 return err;
1670 }
1671
1672 graft:
1673 err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack);
1674 if (err) {
1675 if (q)
1676 qdisc_put(q);
1677 return err;
1678 }
1679
1680 return 0;
1681 }
1682
1683 static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1684 struct netlink_callback *cb,
1685 int *q_idx_p, int s_q_idx, bool recur,
1686 bool dump_invisible)
1687 {
1688 int ret = 0, q_idx = *q_idx_p;
1689 struct Qdisc *q;
1690 int b;
1691
1692 if (!root)
1693 return 0;
1694
1695 q = root;
1696 if (q_idx < s_q_idx) {
1697 q_idx++;
1698 } else {
1699 if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1700 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1701 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1702 RTM_NEWQDISC) <= 0)
1703 goto done;
1704 q_idx++;
1705 }
1706
1707 /* If dumping singletons, there is no qdisc_dev(root) and the singleton
1708 * itself has already been dumped.
1709 *
1710 * If we've already dumped the top-level (ingress) qdisc above and the global
1711 * qdisc hashtable, we don't want to hit it again
1712 */
1713 if (!qdisc_dev(root) || !recur)
1714 goto out;
1715
1716 hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
1717 if (q_idx < s_q_idx) {
1718 q_idx++;
1719 continue;
1720 }
1721 if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1722 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1723 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1724 RTM_NEWQDISC) <= 0)
1725 goto done;
1726 q_idx++;
1727 }
1728
1729 out:
1730 *q_idx_p = q_idx;
1731 return ret;
1732 done:
1733 ret = -1;
1734 goto out;
1735 }
1736
1737 static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1738 {
1739 struct net *net = sock_net(skb->sk);
1740 int idx, q_idx;
1741 int s_idx, s_q_idx;
1742 struct net_device *dev;
1743 const struct nlmsghdr *nlh = cb->nlh;
1744 struct nlattr *tca[TCA_MAX + 1];
1745 int err;
1746
1747 s_idx = cb->args[0];
1748 s_q_idx = q_idx = cb->args[1];
1749
1750 idx = 0;
1751 ASSERT_RTNL();
1752
1753 err = nlmsg_parse_deprecated(nlh, sizeof(struct tcmsg), tca, TCA_MAX,
1754 rtm_tca_policy, cb->extack);
1755 if (err < 0)
1756 return err;
1757
1758 for_each_netdev(net, dev) {
1759 struct netdev_queue *dev_queue;
1760
1761 if (idx < s_idx)
1762 goto cont;
1763 if (idx > s_idx)
1764 s_q_idx = 0;
1765 q_idx = 0;
1766
1767 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx,
1768 true, tca[TCA_DUMP_INVISIBLE]) < 0)
1769 goto done;
1770
1771 dev_queue = dev_ingress_queue(dev);
1772 if (dev_queue &&
1773 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1774 &q_idx, s_q_idx, false,
1775 tca[TCA_DUMP_INVISIBLE]) < 0)
1776 goto done;
1777
1778 cont:
1779 idx++;
1780 }
1781
1782 done:
1783 cb->args[0] = idx;
1784 cb->args[1] = q_idx;
1785
1786 return skb->len;
1787 }
1788
1789
1790
1791 /************************************************
1792 * Traffic classes manipulation. *
1793 ************************************************/
1794
1795 static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1796 unsigned long cl,
1797 u32 portid, u32 seq, u16 flags, int event)
1798 {
1799 struct tcmsg *tcm;
1800 struct nlmsghdr *nlh;
1801 unsigned char *b = skb_tail_pointer(skb);
1802 struct gnet_dump d;
1803 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
1804
1805 cond_resched();
1806 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1807 if (!nlh)
1808 goto out_nlmsg_trim;
1809 tcm = nlmsg_data(nlh);
1810 tcm->tcm_family = AF_UNSPEC;
1811 tcm->tcm__pad1 = 0;
1812 tcm->tcm__pad2 = 0;
1813 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1814 tcm->tcm_parent = q->handle;
1815 tcm->tcm_handle = q->handle;
1816 tcm->tcm_info = 0;
1817 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1818 goto nla_put_failure;
1819 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1820 goto nla_put_failure;
1821
1822 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1823 NULL, &d, TCA_PAD) < 0)
1824 goto nla_put_failure;
1825
1826 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1827 goto nla_put_failure;
1828
1829 if (gnet_stats_finish_copy(&d) < 0)
1830 goto nla_put_failure;
1831
1832 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1833 return skb->len;
1834
1835 out_nlmsg_trim:
1836 nla_put_failure:
1837 nlmsg_trim(skb, b);
1838 return -1;
1839 }
1840
1841 static int tclass_notify(struct net *net, struct sk_buff *oskb,
1842 struct nlmsghdr *n, struct Qdisc *q,
1843 unsigned long cl, int event)
1844 {
1845 struct sk_buff *skb;
1846 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1847 int err = 0;
1848
1849 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1850 if (!skb)
1851 return -ENOBUFS;
1852
1853 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
1854 kfree_skb(skb);
1855 return -EINVAL;
1856 }
1857
1858 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1859 n->nlmsg_flags & NLM_F_ECHO);
1860 if (err > 0)
1861 err = 0;
1862 return err;
1863 }
1864
1865 static int tclass_del_notify(struct net *net,
1866 const struct Qdisc_class_ops *cops,
1867 struct sk_buff *oskb, struct nlmsghdr *n,
1868 struct Qdisc *q, unsigned long cl)
1869 {
1870 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1871 struct sk_buff *skb;
1872 int err = 0;
1873
1874 if (!cops->delete)
1875 return -EOPNOTSUPP;
1876
1877 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1878 if (!skb)
1879 return -ENOBUFS;
1880
1881 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
1882 RTM_DELTCLASS) < 0) {
1883 kfree_skb(skb);
1884 return -EINVAL;
1885 }
1886
1887 err = cops->delete(q, cl);
1888 if (err) {
1889 kfree_skb(skb);
1890 return err;
1891 }
1892
1893 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1894 n->nlmsg_flags & NLM_F_ECHO);
1895 if (err > 0)
1896 err = 0;
1897 return err;
1898 }
1899
1900 #ifdef CONFIG_NET_CLS
1901
1902 struct tcf_bind_args {
1903 struct tcf_walker w;
1904 unsigned long base;
1905 unsigned long cl;
1906 u32 classid;
1907 };
1908
1909 static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
1910 {
1911 struct tcf_bind_args *a = (void *)arg;
1912
1913 if (tp->ops->bind_class) {
1914 struct Qdisc *q = tcf_block_q(tp->chain->block);
1915
1916 sch_tree_lock(q);
1917 tp->ops->bind_class(n, a->classid, a->cl, q, a->base);
1918 sch_tree_unlock(q);
1919 }
1920 return 0;
1921 }
1922
1923 struct tc_bind_class_args {
1924 struct qdisc_walker w;
1925 unsigned long new_cl;
1926 u32 portid;
1927 u32 clid;
1928 };
1929
1930 static int tc_bind_class_walker(struct Qdisc *q, unsigned long cl,
1931 struct qdisc_walker *w)
1932 {
1933 struct tc_bind_class_args *a = (struct tc_bind_class_args *)w;
1934 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1935 struct tcf_block *block;
1936 struct tcf_chain *chain;
1937
1938 block = cops->tcf_block(q, cl, NULL);
1939 if (!block)
1940 return 0;
1941 for (chain = tcf_get_next_chain(block, NULL);
1942 chain;
1943 chain = tcf_get_next_chain(block, chain)) {
1944 struct tcf_proto *tp;
1945
1946 for (tp = tcf_get_next_proto(chain, NULL);
1947 tp; tp = tcf_get_next_proto(chain, tp)) {
1948 struct tcf_bind_args arg = {};
1949
1950 arg.w.fn = tcf_node_bind;
1951 arg.classid = a->clid;
1952 arg.base = cl;
1953 arg.cl = a->new_cl;
1954 tp->ops->walk(tp, &arg.w, true);
1955 }
1956 }
1957
1958 return 0;
1959 }
1960
1961 static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
1962 unsigned long new_cl)
1963 {
1964 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1965 struct tc_bind_class_args args = {};
1966
1967 if (!cops->tcf_block)
1968 return;
1969 args.portid = portid;
1970 args.clid = clid;
1971 args.new_cl = new_cl;
1972 args.w.fn = tc_bind_class_walker;
1973 q->ops->cl_ops->walk(q, &args.w);
1974 }
1975
1976 #else
1977
1978 static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
1979 unsigned long new_cl)
1980 {
1981 }
1982
1983 #endif
1984
1985 static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
1986 struct netlink_ext_ack *extack)
1987 {
1988 struct net *net = sock_net(skb->sk);
1989 struct tcmsg *tcm = nlmsg_data(n);
1990 struct nlattr *tca[TCA_MAX + 1];
1991 struct net_device *dev;
1992 struct Qdisc *q = NULL;
1993 const struct Qdisc_class_ops *cops;
1994 unsigned long cl = 0;
1995 unsigned long new_cl;
1996 u32 portid;
1997 u32 clid;
1998 u32 qid;
1999 int err;
2000
2001 if ((n->nlmsg_type != RTM_GETTCLASS) &&
2002 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2003 return -EPERM;
2004
2005 err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
2006 rtm_tca_policy, extack);
2007 if (err < 0)
2008 return err;
2009
2010 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2011 if (!dev)
2012 return -ENODEV;
2013
2014 /*
2015 parent == TC_H_UNSPEC - unspecified parent.
2016 parent == TC_H_ROOT - class is root, which has no parent.
2017 parent == X:0 - parent is root class.
2018 parent == X:Y - parent is a node in hierarchy.
2019 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
2020
2021 handle == 0:0 - generate handle from kernel pool.
2022 handle == 0:Y - class is X:Y, where X:0 is qdisc.
2023 handle == X:Y - clear.
2024 handle == X:0 - root class.
2025 */
2026
2027 /* Step 1. Determine qdisc handle X:0 */
2028
2029 portid = tcm->tcm_parent;
2030 clid = tcm->tcm_handle;
2031 qid = TC_H_MAJ(clid);
2032
2033 if (portid != TC_H_ROOT) {
2034 u32 qid1 = TC_H_MAJ(portid);
2035
2036 if (qid && qid1) {
2037 /* If both majors are known, they must be identical. */
2038 if (qid != qid1)
2039 return -EINVAL;
2040 } else if (qid1) {
2041 qid = qid1;
2042 } else if (qid == 0)
2043 qid = dev->qdisc->handle;
2044
2045 /* Now qid is genuine qdisc handle consistent
2046 * both with parent and child.
2047 *
2048 * TC_H_MAJ(portid) still may be unspecified, complete it now.
2049 */
2050 if (portid)
2051 portid = TC_H_MAKE(qid, portid);
2052 } else {
2053 if (qid == 0)
2054 qid = dev->qdisc->handle;
2055 }
2056
2057 /* OK. Locate qdisc */
2058 q = qdisc_lookup(dev, qid);
2059 if (!q)
2060 return -ENOENT;
2061
2062 /* An check that it supports classes */
2063 cops = q->ops->cl_ops;
2064 if (cops == NULL)
2065 return -EINVAL;
2066
2067 /* Now try to get class */
2068 if (clid == 0) {
2069 if (portid == TC_H_ROOT)
2070 clid = qid;
2071 } else
2072 clid = TC_H_MAKE(qid, clid);
2073
2074 if (clid)
2075 cl = cops->find(q, clid);
2076
2077 if (cl == 0) {
2078 err = -ENOENT;
2079 if (n->nlmsg_type != RTM_NEWTCLASS ||
2080 !(n->nlmsg_flags & NLM_F_CREATE))
2081 goto out;
2082 } else {
2083 switch (n->nlmsg_type) {
2084 case RTM_NEWTCLASS:
2085 err = -EEXIST;
2086 if (n->nlmsg_flags & NLM_F_EXCL)
2087 goto out;
2088 break;
2089 case RTM_DELTCLASS:
2090 err = tclass_del_notify(net, cops, skb, n, q, cl);
2091 /* Unbind the class with flilters with 0 */
2092 tc_bind_tclass(q, portid, clid, 0);
2093 goto out;
2094 case RTM_GETTCLASS:
2095 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
2096 goto out;
2097 default:
2098 err = -EINVAL;
2099 goto out;
2100 }
2101 }
2102
2103 if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
2104 NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes");
2105 return -EOPNOTSUPP;
2106 }
2107
2108 new_cl = cl;
2109 err = -EOPNOTSUPP;
2110 if (cops->change)
2111 err = cops->change(q, clid, portid, tca, &new_cl, extack);
2112 if (err == 0) {
2113 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
2114 /* We just create a new class, need to do reverse binding. */
2115 if (cl != new_cl)
2116 tc_bind_tclass(q, portid, clid, new_cl);
2117 }
2118 out:
2119 return err;
2120 }
2121
2122 struct qdisc_dump_args {
2123 struct qdisc_walker w;
2124 struct sk_buff *skb;
2125 struct netlink_callback *cb;
2126 };
2127
2128 static int qdisc_class_dump(struct Qdisc *q, unsigned long cl,
2129 struct qdisc_walker *arg)
2130 {
2131 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
2132
2133 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
2134 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2135 RTM_NEWTCLASS);
2136 }
2137
2138 static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
2139 struct tcmsg *tcm, struct netlink_callback *cb,
2140 int *t_p, int s_t)
2141 {
2142 struct qdisc_dump_args arg;
2143
2144 if (tc_qdisc_dump_ignore(q, false) ||
2145 *t_p < s_t || !q->ops->cl_ops ||
2146 (tcm->tcm_parent &&
2147 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
2148 (*t_p)++;
2149 return 0;
2150 }
2151 if (*t_p > s_t)
2152 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
2153 arg.w.fn = qdisc_class_dump;
2154 arg.skb = skb;
2155 arg.cb = cb;
2156 arg.w.stop = 0;
2157 arg.w.skip = cb->args[1];
2158 arg.w.count = 0;
2159 q->ops->cl_ops->walk(q, &arg.w);
2160 cb->args[1] = arg.w.count;
2161 if (arg.w.stop)
2162 return -1;
2163 (*t_p)++;
2164 return 0;
2165 }
2166
2167 static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
2168 struct tcmsg *tcm, struct netlink_callback *cb,
2169 int *t_p, int s_t)
2170 {
2171 struct Qdisc *q;
2172 int b;
2173
2174 if (!root)
2175 return 0;
2176
2177 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
2178 return -1;
2179
2180 if (!qdisc_dev(root))
2181 return 0;
2182
2183 if (tcm->tcm_parent) {
2184 q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent));
2185 if (q && q != root &&
2186 tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
2187 return -1;
2188 return 0;
2189 }
2190 hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
2191 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
2192 return -1;
2193 }
2194
2195 return 0;
2196 }
2197
2198 static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
2199 {
2200 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2201 struct net *net = sock_net(skb->sk);
2202 struct netdev_queue *dev_queue;
2203 struct net_device *dev;
2204 int t, s_t;
2205
2206 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2207 return 0;
2208 dev = dev_get_by_index(net, tcm->tcm_ifindex);
2209 if (!dev)
2210 return 0;
2211
2212 s_t = cb->args[0];
2213 t = 0;
2214
2215 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
2216 goto done;
2217
2218 dev_queue = dev_ingress_queue(dev);
2219 if (dev_queue &&
2220 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
2221 &t, s_t) < 0)
2222 goto done;
2223
2224 done:
2225 cb->args[0] = t;
2226
2227 dev_put(dev);
2228 return skb->len;
2229 }
2230
2231 #ifdef CONFIG_PROC_FS
2232 static int psched_show(struct seq_file *seq, void *v)
2233 {
2234 seq_printf(seq, "%08x %08x %08x %08x\n",
2235 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
2236 1000000,
2237 (u32)NSEC_PER_SEC / hrtimer_resolution);
2238
2239 return 0;
2240 }
2241
2242 static int __net_init psched_net_init(struct net *net)
2243 {
2244 struct proc_dir_entry *e;
2245
2246 e = proc_create_single("psched", 0, net->proc_net, psched_show);
2247 if (e == NULL)
2248 return -ENOMEM;
2249
2250 return 0;
2251 }
2252
2253 static void __net_exit psched_net_exit(struct net *net)
2254 {
2255 remove_proc_entry("psched", net->proc_net);
2256 }
2257 #else
2258 static int __net_init psched_net_init(struct net *net)
2259 {
2260 return 0;
2261 }
2262
2263 static void __net_exit psched_net_exit(struct net *net)
2264 {
2265 }
2266 #endif
2267
2268 static struct pernet_operations psched_net_ops = {
2269 .init = psched_net_init,
2270 .exit = psched_net_exit,
2271 };
2272
2273 static int __init pktsched_init(void)
2274 {
2275 int err;
2276
2277 err = register_pernet_subsys(&psched_net_ops);
2278 if (err) {
2279 pr_err("pktsched_init: "
2280 "cannot initialize per netns operations\n");
2281 return err;
2282 }
2283
2284 register_qdisc(&pfifo_fast_ops);
2285 register_qdisc(&pfifo_qdisc_ops);
2286 register_qdisc(&bfifo_qdisc_ops);
2287 register_qdisc(&pfifo_head_drop_qdisc_ops);
2288 register_qdisc(&mq_qdisc_ops);
2289 register_qdisc(&noqueue_qdisc_ops);
2290
2291 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0);
2292 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0);
2293 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc,
2294 0);
2295 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0);
2296 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0);
2297 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass,
2298 0);
2299
2300 return 0;
2301 }
2302
2303 subsys_initcall(pktsched_init);
Linux with added FPC-III support