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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_api.c Packet scheduler API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Fixes: | |
12 | * | |
13 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. | |
14 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
15 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
1da177e4 | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/errno.h> |
1da177e4 | 23 | #include <linux/skbuff.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/proc_fs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/list.h> | |
4179477f | 29 | #include <linux/hrtimer.h> |
25bfcd5a | 30 | #include <linux/lockdep.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
59cc1f61 | 32 | #include <linux/hashtable.h> |
1da177e4 | 33 | |
457c4cbc | 34 | #include <net/net_namespace.h> |
b854272b | 35 | #include <net/sock.h> |
dc5fc579 | 36 | #include <net/netlink.h> |
1da177e4 LT |
37 | #include <net/pkt_sched.h> |
38 | ||
7316ae88 TG |
39 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
40 | struct nlmsghdr *n, u32 clid, | |
1da177e4 | 41 | struct Qdisc *old, struct Qdisc *new); |
7316ae88 TG |
42 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
43 | struct nlmsghdr *n, struct Qdisc *q, | |
44 | unsigned long cl, int event); | |
1da177e4 LT |
45 | |
46 | /* | |
47 | ||
48 | Short review. | |
49 | ------------- | |
50 | ||
51 | This file consists of two interrelated parts: | |
52 | ||
53 | 1. queueing disciplines manager frontend. | |
54 | 2. traffic classes manager frontend. | |
55 | ||
56 | Generally, queueing discipline ("qdisc") is a black box, | |
57 | which is able to enqueue packets and to dequeue them (when | |
58 | device is ready to send something) in order and at times | |
59 | determined by algorithm hidden in it. | |
60 | ||
61 | qdisc's are divided to two categories: | |
62 | - "queues", which have no internal structure visible from outside. | |
63 | - "schedulers", which split all the packets to "traffic classes", | |
64 | using "packet classifiers" (look at cls_api.c) | |
65 | ||
66 | In turn, classes may have child qdiscs (as rule, queues) | |
67 | attached to them etc. etc. etc. | |
68 | ||
69 | The goal of the routines in this file is to translate | |
70 | information supplied by user in the form of handles | |
71 | to more intelligible for kernel form, to make some sanity | |
72 | checks and part of work, which is common to all qdiscs | |
73 | and to provide rtnetlink notifications. | |
74 | ||
75 | All real intelligent work is done inside qdisc modules. | |
76 | ||
77 | ||
78 | ||
79 | Every discipline has two major routines: enqueue and dequeue. | |
80 | ||
81 | ---dequeue | |
82 | ||
83 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
84 | but it does not mean that queue is empty, it just means that | |
85 | discipline does not want to send anything this time. | |
86 | Queue is really empty if q->q.qlen == 0. | |
87 | For complicated disciplines with multiple queues q->q is not | |
88 | real packet queue, but however q->q.qlen must be valid. | |
89 | ||
90 | ---enqueue | |
91 | ||
92 | enqueue returns 0, if packet was enqueued successfully. | |
93 | If packet (this one or another one) was dropped, it returns | |
94 | not zero error code. | |
95 | NET_XMIT_DROP - this packet dropped | |
96 | Expected action: do not backoff, but wait until queue will clear. | |
97 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
98 | Expected action: backoff or ignore | |
1da177e4 LT |
99 | |
100 | Auxiliary routines: | |
101 | ||
99c0db26 JP |
102 | ---peek |
103 | ||
104 | like dequeue but without removing a packet from the queue | |
105 | ||
1da177e4 LT |
106 | ---reset |
107 | ||
108 | returns qdisc to initial state: purge all buffers, clear all | |
109 | timers, counters (except for statistics) etc. | |
110 | ||
111 | ---init | |
112 | ||
113 | initializes newly created qdisc. | |
114 | ||
115 | ---destroy | |
116 | ||
117 | destroys resources allocated by init and during lifetime of qdisc. | |
118 | ||
119 | ---change | |
120 | ||
121 | changes qdisc parameters. | |
122 | */ | |
123 | ||
124 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
125 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
126 | ||
127 | ||
128 | /************************************************ | |
129 | * Queueing disciplines manipulation. * | |
130 | ************************************************/ | |
131 | ||
132 | ||
133 | /* The list of all installed queueing disciplines. */ | |
134 | ||
135 | static struct Qdisc_ops *qdisc_base; | |
136 | ||
21eb2189 | 137 | /* Register/unregister queueing discipline */ |
1da177e4 LT |
138 | |
139 | int register_qdisc(struct Qdisc_ops *qops) | |
140 | { | |
141 | struct Qdisc_ops *q, **qp; | |
142 | int rc = -EEXIST; | |
143 | ||
144 | write_lock(&qdisc_mod_lock); | |
145 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
146 | if (!strcmp(qops->id, q->id)) | |
147 | goto out; | |
148 | ||
149 | if (qops->enqueue == NULL) | |
150 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 | 151 | if (qops->peek == NULL) { |
68fd26b5 | 152 | if (qops->dequeue == NULL) |
99c0db26 | 153 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
154 | else |
155 | goto out_einval; | |
99c0db26 | 156 | } |
1da177e4 LT |
157 | if (qops->dequeue == NULL) |
158 | qops->dequeue = noop_qdisc_ops.dequeue; | |
159 | ||
68fd26b5 JP |
160 | if (qops->cl_ops) { |
161 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
162 | ||
3e9e5a59 | 163 | if (!(cops->get && cops->put && cops->walk && cops->leaf)) |
68fd26b5 JP |
164 | goto out_einval; |
165 | ||
6529eaba | 166 | if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf)) |
68fd26b5 JP |
167 | goto out_einval; |
168 | } | |
169 | ||
1da177e4 LT |
170 | qops->next = NULL; |
171 | *qp = qops; | |
172 | rc = 0; | |
173 | out: | |
174 | write_unlock(&qdisc_mod_lock); | |
175 | return rc; | |
68fd26b5 JP |
176 | |
177 | out_einval: | |
178 | rc = -EINVAL; | |
179 | goto out; | |
1da177e4 | 180 | } |
62e3ba1b | 181 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
182 | |
183 | int unregister_qdisc(struct Qdisc_ops *qops) | |
184 | { | |
185 | struct Qdisc_ops *q, **qp; | |
186 | int err = -ENOENT; | |
187 | ||
188 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 189 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
190 | if (q == qops) |
191 | break; | |
192 | if (q) { | |
193 | *qp = q->next; | |
194 | q->next = NULL; | |
195 | err = 0; | |
196 | } | |
197 | write_unlock(&qdisc_mod_lock); | |
198 | return err; | |
199 | } | |
62e3ba1b | 200 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 | 201 | |
6da7c8fc | 202 | /* Get default qdisc if not otherwise specified */ |
203 | void qdisc_get_default(char *name, size_t len) | |
204 | { | |
205 | read_lock(&qdisc_mod_lock); | |
206 | strlcpy(name, default_qdisc_ops->id, len); | |
207 | read_unlock(&qdisc_mod_lock); | |
208 | } | |
209 | ||
210 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) | |
211 | { | |
212 | struct Qdisc_ops *q = NULL; | |
213 | ||
214 | for (q = qdisc_base; q; q = q->next) { | |
215 | if (!strcmp(name, q->id)) { | |
216 | if (!try_module_get(q->owner)) | |
217 | q = NULL; | |
218 | break; | |
219 | } | |
220 | } | |
221 | ||
222 | return q; | |
223 | } | |
224 | ||
225 | /* Set new default qdisc to use */ | |
226 | int qdisc_set_default(const char *name) | |
227 | { | |
228 | const struct Qdisc_ops *ops; | |
229 | ||
230 | if (!capable(CAP_NET_ADMIN)) | |
231 | return -EPERM; | |
232 | ||
233 | write_lock(&qdisc_mod_lock); | |
234 | ops = qdisc_lookup_default(name); | |
235 | if (!ops) { | |
236 | /* Not found, drop lock and try to load module */ | |
237 | write_unlock(&qdisc_mod_lock); | |
238 | request_module("sch_%s", name); | |
239 | write_lock(&qdisc_mod_lock); | |
240 | ||
241 | ops = qdisc_lookup_default(name); | |
242 | } | |
243 | ||
244 | if (ops) { | |
245 | /* Set new default */ | |
246 | module_put(default_qdisc_ops->owner); | |
247 | default_qdisc_ops = ops; | |
248 | } | |
249 | write_unlock(&qdisc_mod_lock); | |
250 | ||
251 | return ops ? 0 : -ENOENT; | |
252 | } | |
253 | ||
8ea3e439 | 254 | #ifdef CONFIG_NET_SCH_DEFAULT |
255 | /* Set default value from kernel config */ | |
256 | static int __init sch_default_qdisc(void) | |
257 | { | |
258 | return qdisc_set_default(CONFIG_DEFAULT_NET_SCH); | |
259 | } | |
260 | late_initcall(sch_default_qdisc); | |
261 | #endif | |
262 | ||
1da177e4 | 263 | /* We know handle. Find qdisc among all qdisc's attached to device |
4eaf3b84 ED |
264 | * (root qdisc, all its children, children of children etc.) |
265 | * Note: caller either uses rtnl or rcu_read_lock() | |
1da177e4 LT |
266 | */ |
267 | ||
6113b748 | 268 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
269 | { |
270 | struct Qdisc *q; | |
271 | ||
69012ae4 JK |
272 | if (!qdisc_dev(root)) |
273 | return (root->handle == handle ? root : NULL); | |
274 | ||
8123b421 DM |
275 | if (!(root->flags & TCQ_F_BUILTIN) && |
276 | root->handle == handle) | |
277 | return root; | |
278 | ||
59cc1f61 | 279 | hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) { |
8123b421 DM |
280 | if (q->handle == handle) |
281 | return q; | |
282 | } | |
283 | return NULL; | |
284 | } | |
285 | ||
49b49971 | 286 | void qdisc_hash_add(struct Qdisc *q, bool invisible) |
f6e0b239 | 287 | { |
37314363 | 288 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
4eaf3b84 | 289 | ASSERT_RTNL(); |
59cc1f61 | 290 | hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle); |
49b49971 JK |
291 | if (invisible) |
292 | q->flags |= TCQ_F_INVISIBLE; | |
37314363 | 293 | } |
f6e0b239 | 294 | } |
59cc1f61 | 295 | EXPORT_SYMBOL(qdisc_hash_add); |
f6e0b239 | 296 | |
59cc1f61 | 297 | void qdisc_hash_del(struct Qdisc *q) |
f6e0b239 | 298 | { |
4eaf3b84 ED |
299 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
300 | ASSERT_RTNL(); | |
59cc1f61 | 301 | hash_del_rcu(&q->hash); |
4eaf3b84 | 302 | } |
f6e0b239 | 303 | } |
59cc1f61 | 304 | EXPORT_SYMBOL(qdisc_hash_del); |
f6e0b239 | 305 | |
ead81cc5 | 306 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 307 | { |
f6e0b239 JP |
308 | struct Qdisc *q; |
309 | ||
af356afa PM |
310 | q = qdisc_match_from_root(dev->qdisc, handle); |
311 | if (q) | |
312 | goto out; | |
f6e0b239 | 313 | |
24824a09 ED |
314 | if (dev_ingress_queue(dev)) |
315 | q = qdisc_match_from_root( | |
316 | dev_ingress_queue(dev)->qdisc_sleeping, | |
317 | handle); | |
f6486d40 | 318 | out: |
f6e0b239 | 319 | return q; |
1da177e4 LT |
320 | } |
321 | ||
322 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
323 | { | |
324 | unsigned long cl; | |
325 | struct Qdisc *leaf; | |
20fea08b | 326 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
327 | |
328 | if (cops == NULL) | |
329 | return NULL; | |
330 | cl = cops->get(p, classid); | |
331 | ||
332 | if (cl == 0) | |
333 | return NULL; | |
334 | leaf = cops->leaf(p, cl); | |
335 | cops->put(p, cl); | |
336 | return leaf; | |
337 | } | |
338 | ||
339 | /* Find queueing discipline by name */ | |
340 | ||
1e90474c | 341 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
342 | { |
343 | struct Qdisc_ops *q = NULL; | |
344 | ||
345 | if (kind) { | |
346 | read_lock(&qdisc_mod_lock); | |
347 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 348 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
349 | if (!try_module_get(q->owner)) |
350 | q = NULL; | |
351 | break; | |
352 | } | |
353 | } | |
354 | read_unlock(&qdisc_mod_lock); | |
355 | } | |
356 | return q; | |
357 | } | |
358 | ||
8a8e3d84 JDB |
359 | /* The linklayer setting were not transferred from iproute2, in older |
360 | * versions, and the rate tables lookup systems have been dropped in | |
361 | * the kernel. To keep backward compatible with older iproute2 tc | |
362 | * utils, we detect the linklayer setting by detecting if the rate | |
363 | * table were modified. | |
364 | * | |
365 | * For linklayer ATM table entries, the rate table will be aligned to | |
366 | * 48 bytes, thus some table entries will contain the same value. The | |
367 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
368 | * starting from the mpu, we find low and high table entries for | |
369 | * mapping this cell. If these entries contain the same value, when | |
370 | * the rate tables have been modified for linklayer ATM. | |
371 | * | |
372 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
373 | * and then roundup to the next cell, calc the table entry one below, | |
374 | * and compare. | |
375 | */ | |
376 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
377 | { | |
378 | int low = roundup(r->mpu, 48); | |
379 | int high = roundup(low+1, 48); | |
380 | int cell_low = low >> r->cell_log; | |
381 | int cell_high = (high >> r->cell_log) - 1; | |
382 | ||
383 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
384 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
385 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
386 | return TC_LINKLAYER_ETHERNET; | |
387 | } | |
388 | ||
389 | if ((cell_high > cell_low) && (cell_high < 256) | |
390 | && (rtab[cell_low] == rtab[cell_high])) { | |
391 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
392 | cell_low, cell_high, rtab[cell_high]); | |
393 | return TC_LINKLAYER_ATM; | |
394 | } | |
395 | return TC_LINKLAYER_ETHERNET; | |
396 | } | |
397 | ||
1da177e4 LT |
398 | static struct qdisc_rate_table *qdisc_rtab_list; |
399 | ||
5a7a5555 JHS |
400 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
401 | struct nlattr *tab) | |
1da177e4 LT |
402 | { |
403 | struct qdisc_rate_table *rtab; | |
404 | ||
40edeff6 ED |
405 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
406 | nla_len(tab) != TC_RTAB_SIZE) | |
407 | return NULL; | |
408 | ||
1da177e4 | 409 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
410 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
411 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
412 | rtab->refcnt++; |
413 | return rtab; | |
414 | } | |
415 | } | |
416 | ||
1da177e4 LT |
417 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
418 | if (rtab) { | |
419 | rtab->rate = *r; | |
420 | rtab->refcnt = 1; | |
1e90474c | 421 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
422 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
423 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
424 | rtab->next = qdisc_rtab_list; |
425 | qdisc_rtab_list = rtab; | |
426 | } | |
427 | return rtab; | |
428 | } | |
62e3ba1b | 429 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
430 | |
431 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
432 | { | |
433 | struct qdisc_rate_table *rtab, **rtabp; | |
434 | ||
435 | if (!tab || --tab->refcnt) | |
436 | return; | |
437 | ||
cc7ec456 ED |
438 | for (rtabp = &qdisc_rtab_list; |
439 | (rtab = *rtabp) != NULL; | |
440 | rtabp = &rtab->next) { | |
1da177e4 LT |
441 | if (rtab == tab) { |
442 | *rtabp = rtab->next; | |
443 | kfree(rtab); | |
444 | return; | |
445 | } | |
446 | } | |
447 | } | |
62e3ba1b | 448 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 449 | |
175f9c1b | 450 | static LIST_HEAD(qdisc_stab_list); |
175f9c1b JK |
451 | |
452 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
453 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
454 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
455 | }; | |
456 | ||
457 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
458 | { | |
459 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
460 | struct qdisc_size_table *stab; | |
461 | struct tc_sizespec *s; | |
462 | unsigned int tsize = 0; | |
463 | u16 *tab = NULL; | |
464 | int err; | |
465 | ||
fceb6435 | 466 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, NULL); |
175f9c1b JK |
467 | if (err < 0) |
468 | return ERR_PTR(err); | |
469 | if (!tb[TCA_STAB_BASE]) | |
470 | return ERR_PTR(-EINVAL); | |
471 | ||
472 | s = nla_data(tb[TCA_STAB_BASE]); | |
473 | ||
474 | if (s->tsize > 0) { | |
475 | if (!tb[TCA_STAB_DATA]) | |
476 | return ERR_PTR(-EINVAL); | |
477 | tab = nla_data(tb[TCA_STAB_DATA]); | |
478 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
479 | } | |
480 | ||
00093fab | 481 | if (tsize != s->tsize || (!tab && tsize > 0)) |
175f9c1b JK |
482 | return ERR_PTR(-EINVAL); |
483 | ||
175f9c1b JK |
484 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
485 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
486 | continue; | |
487 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
488 | continue; | |
489 | stab->refcnt++; | |
175f9c1b JK |
490 | return stab; |
491 | } | |
492 | ||
175f9c1b JK |
493 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); |
494 | if (!stab) | |
495 | return ERR_PTR(-ENOMEM); | |
496 | ||
497 | stab->refcnt = 1; | |
498 | stab->szopts = *s; | |
499 | if (tsize > 0) | |
500 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
501 | ||
175f9c1b | 502 | list_add_tail(&stab->list, &qdisc_stab_list); |
175f9c1b JK |
503 | |
504 | return stab; | |
505 | } | |
506 | ||
a2da570d ED |
507 | static void stab_kfree_rcu(struct rcu_head *head) |
508 | { | |
509 | kfree(container_of(head, struct qdisc_size_table, rcu)); | |
510 | } | |
511 | ||
175f9c1b JK |
512 | void qdisc_put_stab(struct qdisc_size_table *tab) |
513 | { | |
514 | if (!tab) | |
515 | return; | |
516 | ||
175f9c1b JK |
517 | if (--tab->refcnt == 0) { |
518 | list_del(&tab->list); | |
a2da570d | 519 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
175f9c1b | 520 | } |
175f9c1b JK |
521 | } |
522 | EXPORT_SYMBOL(qdisc_put_stab); | |
523 | ||
524 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
525 | { | |
526 | struct nlattr *nest; | |
527 | ||
528 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
529 | if (nest == NULL) |
530 | goto nla_put_failure; | |
1b34ec43 DM |
531 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
532 | goto nla_put_failure; | |
175f9c1b JK |
533 | nla_nest_end(skb, nest); |
534 | ||
535 | return skb->len; | |
536 | ||
537 | nla_put_failure: | |
538 | return -1; | |
539 | } | |
540 | ||
5a7a5555 JHS |
541 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
542 | const struct qdisc_size_table *stab) | |
175f9c1b JK |
543 | { |
544 | int pkt_len, slot; | |
545 | ||
546 | pkt_len = skb->len + stab->szopts.overhead; | |
547 | if (unlikely(!stab->szopts.tsize)) | |
548 | goto out; | |
549 | ||
550 | slot = pkt_len + stab->szopts.cell_align; | |
551 | if (unlikely(slot < 0)) | |
552 | slot = 0; | |
553 | ||
554 | slot >>= stab->szopts.cell_log; | |
555 | if (likely(slot < stab->szopts.tsize)) | |
556 | pkt_len = stab->data[slot]; | |
557 | else | |
558 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
559 | (slot / stab->szopts.tsize) + | |
560 | stab->data[slot % stab->szopts.tsize]; | |
561 | ||
562 | pkt_len <<= stab->szopts.size_log; | |
563 | out: | |
564 | if (unlikely(pkt_len < 1)) | |
565 | pkt_len = 1; | |
566 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
567 | } | |
a2da570d | 568 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 569 | |
6e765a00 | 570 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
571 | { |
572 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
573 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
574 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
575 | qdisc->flags |= TCQ_F_WARN_NONWC; |
576 | } | |
577 | } | |
578 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
579 | ||
4179477f PM |
580 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
581 | { | |
582 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 583 | timer); |
4179477f | 584 | |
1e203c1a | 585 | rcu_read_lock(); |
8608db03 | 586 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 587 | rcu_read_unlock(); |
1936502d | 588 | |
4179477f PM |
589 | return HRTIMER_NORESTART; |
590 | } | |
591 | ||
592 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
593 | { | |
4a8e320c | 594 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 595 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
596 | wd->qdisc = qdisc; |
597 | } | |
598 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
599 | ||
45f50bed | 600 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires) |
4179477f | 601 | { |
2540e051 JP |
602 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
603 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
604 | return; | |
605 | ||
a9efad8b ED |
606 | if (wd->last_expires == expires) |
607 | return; | |
608 | ||
609 | wd->last_expires = expires; | |
46baac38 | 610 | hrtimer_start(&wd->timer, |
34c5d292 | 611 | ns_to_ktime(expires), |
4a8e320c | 612 | HRTIMER_MODE_ABS_PINNED); |
4179477f | 613 | } |
34c5d292 | 614 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
4179477f PM |
615 | |
616 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
617 | { | |
2fbd3da3 | 618 | hrtimer_cancel(&wd->timer); |
4179477f PM |
619 | } |
620 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 621 | |
a94f779f | 622 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 | 623 | { |
6fe1c7a5 | 624 | struct hlist_head *h; |
9695fe6f | 625 | unsigned int i; |
6fe1c7a5 | 626 | |
9695fe6f | 627 | h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL); |
6fe1c7a5 PM |
628 | |
629 | if (h != NULL) { | |
630 | for (i = 0; i < n; i++) | |
631 | INIT_HLIST_HEAD(&h[i]); | |
632 | } | |
633 | return h; | |
634 | } | |
635 | ||
6fe1c7a5 PM |
636 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) |
637 | { | |
638 | struct Qdisc_class_common *cl; | |
b67bfe0d | 639 | struct hlist_node *next; |
6fe1c7a5 PM |
640 | struct hlist_head *nhash, *ohash; |
641 | unsigned int nsize, nmask, osize; | |
642 | unsigned int i, h; | |
643 | ||
644 | /* Rehash when load factor exceeds 0.75 */ | |
645 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
646 | return; | |
647 | nsize = clhash->hashsize * 2; | |
648 | nmask = nsize - 1; | |
649 | nhash = qdisc_class_hash_alloc(nsize); | |
650 | if (nhash == NULL) | |
651 | return; | |
652 | ||
653 | ohash = clhash->hash; | |
654 | osize = clhash->hashsize; | |
655 | ||
656 | sch_tree_lock(sch); | |
657 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 658 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
659 | h = qdisc_class_hash(cl->classid, nmask); |
660 | hlist_add_head(&cl->hnode, &nhash[h]); | |
661 | } | |
662 | } | |
663 | clhash->hash = nhash; | |
664 | clhash->hashsize = nsize; | |
665 | clhash->hashmask = nmask; | |
666 | sch_tree_unlock(sch); | |
667 | ||
9695fe6f | 668 | kvfree(ohash); |
6fe1c7a5 PM |
669 | } |
670 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
671 | ||
672 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
673 | { | |
674 | unsigned int size = 4; | |
675 | ||
676 | clhash->hash = qdisc_class_hash_alloc(size); | |
677 | if (clhash->hash == NULL) | |
678 | return -ENOMEM; | |
679 | clhash->hashsize = size; | |
680 | clhash->hashmask = size - 1; | |
681 | clhash->hashelems = 0; | |
682 | return 0; | |
683 | } | |
684 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
685 | ||
686 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
687 | { | |
9695fe6f | 688 | kvfree(clhash->hash); |
6fe1c7a5 PM |
689 | } |
690 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
691 | ||
692 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
693 | struct Qdisc_class_common *cl) | |
694 | { | |
695 | unsigned int h; | |
696 | ||
697 | INIT_HLIST_NODE(&cl->hnode); | |
698 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
699 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
700 | clhash->hashelems++; | |
701 | } | |
702 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
703 | ||
704 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
705 | struct Qdisc_class_common *cl) | |
706 | { | |
707 | hlist_del(&cl->hnode); | |
708 | clhash->hashelems--; | |
709 | } | |
710 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
711 | ||
fa0f5aa7 ED |
712 | /* Allocate an unique handle from space managed by kernel |
713 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
714 | */ | |
1da177e4 LT |
715 | static u32 qdisc_alloc_handle(struct net_device *dev) |
716 | { | |
fa0f5aa7 | 717 | int i = 0x8000; |
1da177e4 LT |
718 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
719 | ||
720 | do { | |
721 | autohandle += TC_H_MAKE(0x10000U, 0); | |
722 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
723 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
724 | if (!qdisc_lookup(dev, autohandle)) |
725 | return autohandle; | |
726 | cond_resched(); | |
727 | } while (--i > 0); | |
1da177e4 | 728 | |
fa0f5aa7 | 729 | return 0; |
1da177e4 LT |
730 | } |
731 | ||
2ccccf5f WC |
732 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, unsigned int n, |
733 | unsigned int len) | |
43effa1e | 734 | { |
20fea08b | 735 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
736 | unsigned long cl; |
737 | u32 parentid; | |
95946658 | 738 | bool notify; |
2c8c8e6f | 739 | int drops; |
43effa1e | 740 | |
2ccccf5f | 741 | if (n == 0 && len == 0) |
43effa1e | 742 | return; |
2c8c8e6f | 743 | drops = max_t(int, n, 0); |
4eaf3b84 | 744 | rcu_read_lock(); |
43effa1e | 745 | while ((parentid = sch->parent)) { |
066a3b5b | 746 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 747 | break; |
066a3b5b | 748 | |
4eaf3b84 ED |
749 | if (sch->flags & TCQ_F_NOPARENT) |
750 | break; | |
95946658 KK |
751 | /* Notify parent qdisc only if child qdisc becomes empty. |
752 | * | |
753 | * If child was empty even before update then backlog | |
754 | * counter is screwed and we skip notification because | |
755 | * parent class is already passive. | |
756 | */ | |
757 | notify = !sch->q.qlen && !WARN_ON_ONCE(!n); | |
4eaf3b84 | 758 | /* TODO: perform the search on a per txq basis */ |
5ce2d488 | 759 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 760 | if (sch == NULL) { |
4eaf3b84 ED |
761 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
762 | break; | |
ffc8fefa | 763 | } |
43effa1e | 764 | cops = sch->ops->cl_ops; |
95946658 | 765 | if (notify && cops->qlen_notify) { |
43effa1e PM |
766 | cl = cops->get(sch, parentid); |
767 | cops->qlen_notify(sch, cl); | |
768 | cops->put(sch, cl); | |
769 | } | |
770 | sch->q.qlen -= n; | |
2ccccf5f | 771 | sch->qstats.backlog -= len; |
25331d6c | 772 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 773 | } |
4eaf3b84 | 774 | rcu_read_unlock(); |
43effa1e | 775 | } |
2ccccf5f | 776 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
1da177e4 | 777 | |
7316ae88 TG |
778 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
779 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
780 | struct Qdisc *old, struct Qdisc *new) |
781 | { | |
782 | if (new || old) | |
7316ae88 | 783 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 784 | |
4d8863a2 | 785 | if (old) |
99194cff | 786 | qdisc_destroy(old); |
99194cff DM |
787 | } |
788 | ||
789 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
790 | * to device "dev". | |
791 | * | |
792 | * When appropriate send a netlink notification using 'skb' | |
793 | * and "n". | |
794 | * | |
795 | * On success, destroy old qdisc. | |
1da177e4 LT |
796 | */ |
797 | ||
798 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
799 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
800 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 801 | { |
99194cff | 802 | struct Qdisc *q = old; |
7316ae88 | 803 | struct net *net = dev_net(dev); |
1da177e4 | 804 | int err = 0; |
1da177e4 | 805 | |
10297b99 | 806 | if (parent == NULL) { |
99194cff DM |
807 | unsigned int i, num_q, ingress; |
808 | ||
809 | ingress = 0; | |
810 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
811 | if ((q && q->flags & TCQ_F_INGRESS) || |
812 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
813 | num_q = 1; |
814 | ingress = 1; | |
24824a09 ED |
815 | if (!dev_ingress_queue(dev)) |
816 | return -ENOENT; | |
99194cff DM |
817 | } |
818 | ||
819 | if (dev->flags & IFF_UP) | |
820 | dev_deactivate(dev); | |
821 | ||
86e363dc WC |
822 | if (new && new->ops->attach) |
823 | goto skip; | |
6ec1c69a | 824 | |
99194cff | 825 | for (i = 0; i < num_q; i++) { |
24824a09 | 826 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
827 | |
828 | if (!ingress) | |
829 | dev_queue = netdev_get_tx_queue(dev, i); | |
830 | ||
8d50b53d DM |
831 | old = dev_graft_qdisc(dev_queue, new); |
832 | if (new && i > 0) | |
7b936405 | 833 | refcount_inc(&new->refcnt); |
8d50b53d | 834 | |
036d6a67 JP |
835 | if (!ingress) |
836 | qdisc_destroy(old); | |
1da177e4 | 837 | } |
99194cff | 838 | |
86e363dc | 839 | skip: |
036d6a67 | 840 | if (!ingress) { |
7316ae88 TG |
841 | notify_and_destroy(net, skb, n, classid, |
842 | dev->qdisc, new); | |
036d6a67 | 843 | if (new && !new->ops->attach) |
7b936405 | 844 | refcount_inc(&new->refcnt); |
036d6a67 | 845 | dev->qdisc = new ? : &noop_qdisc; |
86e363dc WC |
846 | |
847 | if (new && new->ops->attach) | |
848 | new->ops->attach(new); | |
036d6a67 | 849 | } else { |
7316ae88 | 850 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 851 | } |
af356afa | 852 | |
99194cff DM |
853 | if (dev->flags & IFF_UP) |
854 | dev_activate(dev); | |
1da177e4 | 855 | } else { |
20fea08b | 856 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 857 | |
c9f1d038 PM |
858 | err = -EOPNOTSUPP; |
859 | if (cops && cops->graft) { | |
1da177e4 LT |
860 | unsigned long cl = cops->get(parent, classid); |
861 | if (cl) { | |
99194cff | 862 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 863 | cops->put(parent, cl); |
c9f1d038 PM |
864 | } else |
865 | err = -ENOENT; | |
1da177e4 | 866 | } |
99194cff | 867 | if (!err) |
7316ae88 | 868 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
869 | } |
870 | return err; | |
871 | } | |
872 | ||
25bfcd5a JP |
873 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
874 | static struct lock_class_key qdisc_tx_lock; | |
875 | static struct lock_class_key qdisc_rx_lock; | |
876 | ||
1da177e4 LT |
877 | /* |
878 | Allocate and initialize new qdisc. | |
879 | ||
880 | Parameters are passed via opt. | |
881 | */ | |
882 | ||
5a7a5555 JHS |
883 | static struct Qdisc *qdisc_create(struct net_device *dev, |
884 | struct netdev_queue *dev_queue, | |
885 | struct Qdisc *p, u32 parent, u32 handle, | |
886 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
887 | { |
888 | int err; | |
1e90474c | 889 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
890 | struct Qdisc *sch; |
891 | struct Qdisc_ops *ops; | |
175f9c1b | 892 | struct qdisc_size_table *stab; |
1da177e4 LT |
893 | |
894 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 895 | #ifdef CONFIG_MODULES |
1da177e4 LT |
896 | if (ops == NULL && kind != NULL) { |
897 | char name[IFNAMSIZ]; | |
1e90474c | 898 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
899 | /* We dropped the RTNL semaphore in order to |
900 | * perform the module load. So, even if we | |
901 | * succeeded in loading the module we have to | |
902 | * tell the caller to replay the request. We | |
903 | * indicate this using -EAGAIN. | |
904 | * We replay the request because the device may | |
905 | * go away in the mean time. | |
906 | */ | |
907 | rtnl_unlock(); | |
908 | request_module("sch_%s", name); | |
909 | rtnl_lock(); | |
910 | ops = qdisc_lookup_ops(kind); | |
911 | if (ops != NULL) { | |
912 | /* We will try again qdisc_lookup_ops, | |
913 | * so don't keep a reference. | |
914 | */ | |
915 | module_put(ops->owner); | |
916 | err = -EAGAIN; | |
917 | goto err_out; | |
918 | } | |
919 | } | |
920 | } | |
921 | #endif | |
922 | ||
b9e2cc0f | 923 | err = -ENOENT; |
1da177e4 LT |
924 | if (ops == NULL) |
925 | goto err_out; | |
926 | ||
5ce2d488 | 927 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
928 | if (IS_ERR(sch)) { |
929 | err = PTR_ERR(sch); | |
1da177e4 | 930 | goto err_out2; |
3d54b82f | 931 | } |
1da177e4 | 932 | |
ffc8fefa PM |
933 | sch->parent = parent; |
934 | ||
3d54b82f | 935 | if (handle == TC_H_INGRESS) { |
1da177e4 | 936 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 937 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 938 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 939 | } else { |
fd44de7c PM |
940 | if (handle == 0) { |
941 | handle = qdisc_alloc_handle(dev); | |
942 | err = -ENOMEM; | |
943 | if (handle == 0) | |
944 | goto err_out3; | |
945 | } | |
25bfcd5a | 946 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1abbe139 | 947 | if (!netif_is_multiqueue(dev)) |
225734de | 948 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
949 | } |
950 | ||
3d54b82f | 951 | sch->handle = handle; |
1da177e4 | 952 | |
84c46dd8 JDB |
953 | /* This exist to keep backward compatible with a userspace |
954 | * loophole, what allowed userspace to get IFF_NO_QUEUE | |
955 | * facility on older kernels by setting tx_queue_len=0 (prior | |
956 | * to qdisc init), and then forgot to reinit tx_queue_len | |
957 | * before again attaching a qdisc. | |
958 | */ | |
959 | if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { | |
960 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; | |
961 | netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); | |
962 | } | |
963 | ||
1e90474c | 964 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
22e0f8b9 JF |
965 | if (qdisc_is_percpu_stats(sch)) { |
966 | sch->cpu_bstats = | |
7c1c97d5 | 967 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
22e0f8b9 JF |
968 | if (!sch->cpu_bstats) |
969 | goto err_out4; | |
b0ab6f92 JF |
970 | |
971 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
972 | if (!sch->cpu_qstats) | |
973 | goto err_out4; | |
22e0f8b9 JF |
974 | } |
975 | ||
175f9c1b JK |
976 | if (tca[TCA_STAB]) { |
977 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
978 | if (IS_ERR(stab)) { | |
979 | err = PTR_ERR(stab); | |
7c64b9f3 | 980 | goto err_out4; |
175f9c1b | 981 | } |
a2da570d | 982 | rcu_assign_pointer(sch->stab, stab); |
175f9c1b | 983 | } |
1e90474c | 984 | if (tca[TCA_RATE]) { |
edb09eb1 | 985 | seqcount_t *running; |
f6f9b93f | 986 | |
23bcf634 PM |
987 | err = -EOPNOTSUPP; |
988 | if (sch->flags & TCQ_F_MQROOT) | |
989 | goto err_out4; | |
990 | ||
f6f9b93f | 991 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
992 | !(sch->flags & TCQ_F_INGRESS) && |
993 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
edb09eb1 | 994 | running = qdisc_root_sleeping_running(sch); |
f6f9b93f | 995 | else |
edb09eb1 | 996 | running = &sch->running; |
f6f9b93f | 997 | |
22e0f8b9 JF |
998 | err = gen_new_estimator(&sch->bstats, |
999 | sch->cpu_bstats, | |
1000 | &sch->rate_est, | |
edb09eb1 ED |
1001 | NULL, |
1002 | running, | |
22e0f8b9 | 1003 | tca[TCA_RATE]); |
23bcf634 PM |
1004 | if (err) |
1005 | goto err_out4; | |
023e09a7 | 1006 | } |
f6e0b239 | 1007 | |
49b49971 | 1008 | qdisc_hash_add(sch, false); |
1da177e4 | 1009 | |
1da177e4 LT |
1010 | return sch; |
1011 | } | |
87b60cfa | 1012 | /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ |
c1a4872e GF |
1013 | if (ops->destroy) |
1014 | ops->destroy(sch); | |
1da177e4 LT |
1015 | err_out3: |
1016 | dev_put(dev); | |
3d54b82f | 1017 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
1018 | err_out2: |
1019 | module_put(ops->owner); | |
1020 | err_out: | |
1021 | *errp = err; | |
1da177e4 | 1022 | return NULL; |
23bcf634 PM |
1023 | |
1024 | err_out4: | |
22e0f8b9 | 1025 | free_percpu(sch->cpu_bstats); |
b0ab6f92 | 1026 | free_percpu(sch->cpu_qstats); |
23bcf634 PM |
1027 | /* |
1028 | * Any broken qdiscs that would require a ops->reset() here? | |
1029 | * The qdisc was never in action so it shouldn't be necessary. | |
1030 | */ | |
a2da570d | 1031 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1032 | if (ops->destroy) |
1033 | ops->destroy(sch); | |
1034 | goto err_out3; | |
1da177e4 LT |
1035 | } |
1036 | ||
1e90474c | 1037 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 1038 | { |
a2da570d | 1039 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1040 | int err = 0; |
1da177e4 | 1041 | |
175f9c1b | 1042 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
1043 | if (sch->ops->change == NULL) |
1044 | return -EINVAL; | |
1e90474c | 1045 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
1046 | if (err) |
1047 | return err; | |
1048 | } | |
175f9c1b JK |
1049 | |
1050 | if (tca[TCA_STAB]) { | |
1051 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
1052 | if (IS_ERR(stab)) | |
1053 | return PTR_ERR(stab); | |
1054 | } | |
1055 | ||
a2da570d ED |
1056 | ostab = rtnl_dereference(sch->stab); |
1057 | rcu_assign_pointer(sch->stab, stab); | |
1058 | qdisc_put_stab(ostab); | |
175f9c1b | 1059 | |
23bcf634 | 1060 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1061 | /* NB: ignores errors from replace_estimator |
1062 | because change can't be undone. */ | |
23bcf634 PM |
1063 | if (sch->flags & TCQ_F_MQROOT) |
1064 | goto out; | |
22e0f8b9 JF |
1065 | gen_replace_estimator(&sch->bstats, |
1066 | sch->cpu_bstats, | |
1067 | &sch->rate_est, | |
edb09eb1 ED |
1068 | NULL, |
1069 | qdisc_root_sleeping_running(sch), | |
22e0f8b9 | 1070 | tca[TCA_RATE]); |
23bcf634 PM |
1071 | } |
1072 | out: | |
1da177e4 LT |
1073 | return 0; |
1074 | } | |
1075 | ||
cc7ec456 ED |
1076 | struct check_loop_arg { |
1077 | struct qdisc_walker w; | |
1da177e4 LT |
1078 | struct Qdisc *p; |
1079 | int depth; | |
1080 | }; | |
1081 | ||
5a7a5555 JHS |
1082 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, |
1083 | struct qdisc_walker *w); | |
1da177e4 LT |
1084 | |
1085 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1086 | { | |
1087 | struct check_loop_arg arg; | |
1088 | ||
1089 | if (q->ops->cl_ops == NULL) | |
1090 | return 0; | |
1091 | ||
1092 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1093 | arg.w.fn = check_loop_fn; | |
1094 | arg.depth = depth; | |
1095 | arg.p = p; | |
1096 | q->ops->cl_ops->walk(q, &arg.w); | |
1097 | return arg.w.stop ? -ELOOP : 0; | |
1098 | } | |
1099 | ||
1100 | static int | |
1101 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1102 | { | |
1103 | struct Qdisc *leaf; | |
20fea08b | 1104 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1105 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1106 | ||
1107 | leaf = cops->leaf(q, cl); | |
1108 | if (leaf) { | |
1109 | if (leaf == arg->p || arg->depth > 7) | |
1110 | return -ELOOP; | |
1111 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1112 | } | |
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * Delete/get qdisc. | |
1118 | */ | |
1119 | ||
c21ef3e3 DA |
1120 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1121 | struct netlink_ext_ack *extack) | |
1da177e4 | 1122 | { |
3b1e0a65 | 1123 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1124 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1125 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1126 | struct net_device *dev; |
de179c8c | 1127 | u32 clid; |
1da177e4 LT |
1128 | struct Qdisc *q = NULL; |
1129 | struct Qdisc *p = NULL; | |
1130 | int err; | |
1131 | ||
4e8bbb81 | 1132 | if ((n->nlmsg_type != RTM_GETQDISC) && |
5f013c9b | 1133 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1134 | return -EPERM; |
1135 | ||
c21ef3e3 | 1136 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack); |
1e90474c PM |
1137 | if (err < 0) |
1138 | return err; | |
1139 | ||
de179c8c H |
1140 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1141 | if (!dev) | |
1142 | return -ENODEV; | |
1143 | ||
1144 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1145 | if (clid) { |
1146 | if (clid != TC_H_ROOT) { | |
1147 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 ED |
1148 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1149 | if (!p) | |
1da177e4 LT |
1150 | return -ENOENT; |
1151 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1152 | } else if (dev_ingress_queue(dev)) { |
1153 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1154 | } |
1da177e4 | 1155 | } else { |
af356afa | 1156 | q = dev->qdisc; |
1da177e4 LT |
1157 | } |
1158 | if (!q) | |
1159 | return -ENOENT; | |
1160 | ||
1161 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
1162 | return -EINVAL; | |
1163 | } else { | |
cc7ec456 ED |
1164 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1165 | if (!q) | |
1da177e4 LT |
1166 | return -ENOENT; |
1167 | } | |
1168 | ||
1e90474c | 1169 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1170 | return -EINVAL; |
1171 | ||
1172 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1173 | if (!clid) | |
1174 | return -EINVAL; | |
1175 | if (q->handle == 0) | |
1176 | return -ENOENT; | |
cc7ec456 ED |
1177 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
1178 | if (err != 0) | |
1da177e4 | 1179 | return err; |
1da177e4 | 1180 | } else { |
7316ae88 | 1181 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1182 | } |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | /* | |
cc7ec456 | 1187 | * Create/change qdisc. |
1da177e4 LT |
1188 | */ |
1189 | ||
c21ef3e3 DA |
1190 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1191 | struct netlink_ext_ack *extack) | |
1da177e4 | 1192 | { |
3b1e0a65 | 1193 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1194 | struct tcmsg *tcm; |
1e90474c | 1195 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1196 | struct net_device *dev; |
1197 | u32 clid; | |
1198 | struct Qdisc *q, *p; | |
1199 | int err; | |
1200 | ||
5f013c9b | 1201 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1202 | return -EPERM; |
1203 | ||
1da177e4 LT |
1204 | replay: |
1205 | /* Reinit, just in case something touches this. */ | |
c21ef3e3 | 1206 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack); |
de179c8c H |
1207 | if (err < 0) |
1208 | return err; | |
1209 | ||
02ef22ca | 1210 | tcm = nlmsg_data(n); |
1da177e4 LT |
1211 | clid = tcm->tcm_parent; |
1212 | q = p = NULL; | |
1213 | ||
cc7ec456 ED |
1214 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1215 | if (!dev) | |
1da177e4 LT |
1216 | return -ENODEV; |
1217 | ||
1e90474c | 1218 | |
1da177e4 LT |
1219 | if (clid) { |
1220 | if (clid != TC_H_ROOT) { | |
1221 | if (clid != TC_H_INGRESS) { | |
cc7ec456 ED |
1222 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1223 | if (!p) | |
1da177e4 LT |
1224 | return -ENOENT; |
1225 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1226 | } else if (dev_ingress_queue_create(dev)) { |
1227 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1228 | } |
1229 | } else { | |
af356afa | 1230 | q = dev->qdisc; |
1da177e4 LT |
1231 | } |
1232 | ||
1233 | /* It may be default qdisc, ignore it */ | |
1234 | if (q && q->handle == 0) | |
1235 | q = NULL; | |
1236 | ||
1237 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1238 | if (tcm->tcm_handle) { | |
cc7ec456 | 1239 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
1da177e4 LT |
1240 | return -EEXIST; |
1241 | if (TC_H_MIN(tcm->tcm_handle)) | |
1242 | return -EINVAL; | |
cc7ec456 ED |
1243 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1244 | if (!q) | |
1da177e4 | 1245 | goto create_n_graft; |
cc7ec456 | 1246 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1247 | return -EEXIST; |
1e90474c | 1248 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1249 | return -EINVAL; |
1250 | if (q == p || | |
1251 | (p && check_loop(q, p, 0))) | |
1252 | return -ELOOP; | |
7b936405 | 1253 | refcount_inc(&q->refcnt); |
1da177e4 LT |
1254 | goto graft; |
1255 | } else { | |
cc7ec456 | 1256 | if (!q) |
1da177e4 LT |
1257 | goto create_n_graft; |
1258 | ||
1259 | /* This magic test requires explanation. | |
1260 | * | |
1261 | * We know, that some child q is already | |
1262 | * attached to this parent and have choice: | |
1263 | * either to change it or to create/graft new one. | |
1264 | * | |
1265 | * 1. We are allowed to create/graft only | |
1266 | * if CREATE and REPLACE flags are set. | |
1267 | * | |
1268 | * 2. If EXCL is set, requestor wanted to say, | |
1269 | * that qdisc tcm_handle is not expected | |
1270 | * to exist, so that we choose create/graft too. | |
1271 | * | |
1272 | * 3. The last case is when no flags are set. | |
1273 | * Alas, it is sort of hole in API, we | |
1274 | * cannot decide what to do unambiguously. | |
1275 | * For now we select create/graft, if | |
1276 | * user gave KIND, which does not match existing. | |
1277 | */ | |
cc7ec456 ED |
1278 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1279 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1280 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1281 | (tca[TCA_KIND] && |
1282 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1283 | goto create_n_graft; |
1284 | } | |
1285 | } | |
1286 | } else { | |
1287 | if (!tcm->tcm_handle) | |
1288 | return -EINVAL; | |
1289 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1290 | } | |
1291 | ||
1292 | /* Change qdisc parameters */ | |
1293 | if (q == NULL) | |
1294 | return -ENOENT; | |
cc7ec456 | 1295 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1296 | return -EEXIST; |
1e90474c | 1297 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1298 | return -EINVAL; |
1299 | err = qdisc_change(q, tca); | |
1300 | if (err == 0) | |
7316ae88 | 1301 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1302 | return err; |
1303 | ||
1304 | create_n_graft: | |
cc7ec456 | 1305 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
1da177e4 | 1306 | return -ENOENT; |
24824a09 ED |
1307 | if (clid == TC_H_INGRESS) { |
1308 | if (dev_ingress_queue(dev)) | |
1309 | q = qdisc_create(dev, dev_ingress_queue(dev), p, | |
1310 | tcm->tcm_parent, tcm->tcm_parent, | |
1311 | tca, &err); | |
1312 | else | |
1313 | err = -ENOENT; | |
1314 | } else { | |
926e61b7 | 1315 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1316 | |
1317 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1318 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1319 | else if (p) | |
1320 | dev_queue = p->dev_queue; | |
1321 | else | |
1322 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1323 | |
926e61b7 | 1324 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1325 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1326 | tca, &err); |
6ec1c69a | 1327 | } |
1da177e4 LT |
1328 | if (q == NULL) { |
1329 | if (err == -EAGAIN) | |
1330 | goto replay; | |
1331 | return err; | |
1332 | } | |
1333 | ||
1334 | graft: | |
e5befbd9 IJ |
1335 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1336 | if (err) { | |
1337 | if (q) | |
1338 | qdisc_destroy(q); | |
1339 | return err; | |
1da177e4 | 1340 | } |
e5befbd9 | 1341 | |
1da177e4 LT |
1342 | return 0; |
1343 | } | |
1344 | ||
1345 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
15e47304 | 1346 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 | 1347 | { |
22e0f8b9 | 1348 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; |
b0ab6f92 | 1349 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; |
1da177e4 LT |
1350 | struct tcmsg *tcm; |
1351 | struct nlmsghdr *nlh; | |
27a884dc | 1352 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1353 | struct gnet_dump d; |
a2da570d | 1354 | struct qdisc_size_table *stab; |
64015853 | 1355 | __u32 qlen; |
1da177e4 | 1356 | |
fba373d2 | 1357 | cond_resched(); |
15e47304 | 1358 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1359 | if (!nlh) |
1360 | goto out_nlmsg_trim; | |
1361 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1362 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 PM |
1363 | tcm->tcm__pad1 = 0; |
1364 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1365 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1366 | tcm->tcm_parent = clid; |
1367 | tcm->tcm_handle = q->handle; | |
7b936405 | 1368 | tcm->tcm_info = refcount_read(&q->refcnt); |
1b34ec43 DM |
1369 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1370 | goto nla_put_failure; | |
1da177e4 | 1371 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1372 | goto nla_put_failure; |
64015853 | 1373 | qlen = q->q.qlen; |
1da177e4 | 1374 | |
a2da570d ED |
1375 | stab = rtnl_dereference(q->stab); |
1376 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
175f9c1b JK |
1377 | goto nla_put_failure; |
1378 | ||
102396ae | 1379 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
edb09eb1 | 1380 | NULL, &d, TCA_PAD) < 0) |
1e90474c | 1381 | goto nla_put_failure; |
1da177e4 LT |
1382 | |
1383 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1384 | goto nla_put_failure; |
1da177e4 | 1385 | |
b0ab6f92 | 1386 | if (qdisc_is_percpu_stats(q)) { |
22e0f8b9 | 1387 | cpu_bstats = q->cpu_bstats; |
b0ab6f92 JF |
1388 | cpu_qstats = q->cpu_qstats; |
1389 | } | |
22e0f8b9 | 1390 | |
edb09eb1 ED |
1391 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q), |
1392 | &d, cpu_bstats, &q->bstats) < 0 || | |
1c0d32fd | 1393 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
b0ab6f92 | 1394 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) |
1e90474c | 1395 | goto nla_put_failure; |
10297b99 | 1396 | |
1da177e4 | 1397 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1398 | goto nla_put_failure; |
10297b99 | 1399 | |
27a884dc | 1400 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1401 | return skb->len; |
1402 | ||
02ef22ca | 1403 | out_nlmsg_trim: |
1e90474c | 1404 | nla_put_failure: |
dc5fc579 | 1405 | nlmsg_trim(skb, b); |
1da177e4 LT |
1406 | return -1; |
1407 | } | |
1408 | ||
49b49971 | 1409 | static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible) |
53b0f080 | 1410 | { |
49b49971 JK |
1411 | if (q->flags & TCQ_F_BUILTIN) |
1412 | return true; | |
1413 | if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible) | |
1414 | return true; | |
1415 | ||
1416 | return false; | |
53b0f080 ED |
1417 | } |
1418 | ||
7316ae88 TG |
1419 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1420 | struct nlmsghdr *n, u32 clid, | |
1421 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1422 | { |
1423 | struct sk_buff *skb; | |
15e47304 | 1424 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1425 | |
1426 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1427 | if (!skb) | |
1428 | return -ENOBUFS; | |
1429 | ||
49b49971 | 1430 | if (old && !tc_qdisc_dump_ignore(old, false)) { |
15e47304 | 1431 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1432 | 0, RTM_DELQDISC) < 0) |
1da177e4 LT |
1433 | goto err_out; |
1434 | } | |
49b49971 | 1435 | if (new && !tc_qdisc_dump_ignore(new, false)) { |
15e47304 | 1436 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1437 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
1da177e4 LT |
1438 | goto err_out; |
1439 | } | |
1440 | ||
1441 | if (skb->len) | |
15e47304 | 1442 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1443 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1444 | |
1445 | err_out: | |
1446 | kfree_skb(skb); | |
1447 | return -EINVAL; | |
1448 | } | |
1449 | ||
30723673 DM |
1450 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1451 | struct netlink_callback *cb, | |
49b49971 JK |
1452 | int *q_idx_p, int s_q_idx, bool recur, |
1453 | bool dump_invisible) | |
30723673 DM |
1454 | { |
1455 | int ret = 0, q_idx = *q_idx_p; | |
1456 | struct Qdisc *q; | |
59cc1f61 | 1457 | int b; |
30723673 DM |
1458 | |
1459 | if (!root) | |
1460 | return 0; | |
1461 | ||
1462 | q = root; | |
1463 | if (q_idx < s_q_idx) { | |
1464 | q_idx++; | |
1465 | } else { | |
49b49971 | 1466 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1467 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1468 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1469 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1470 | goto done; |
1471 | q_idx++; | |
1472 | } | |
69012ae4 | 1473 | |
ea327469 JK |
1474 | /* If dumping singletons, there is no qdisc_dev(root) and the singleton |
1475 | * itself has already been dumped. | |
1476 | * | |
1477 | * If we've already dumped the top-level (ingress) qdisc above and the global | |
1478 | * qdisc hashtable, we don't want to hit it again | |
1479 | */ | |
1480 | if (!qdisc_dev(root) || !recur) | |
69012ae4 JK |
1481 | goto out; |
1482 | ||
59cc1f61 | 1483 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1484 | if (q_idx < s_q_idx) { |
1485 | q_idx++; | |
1486 | continue; | |
1487 | } | |
49b49971 | 1488 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1489 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1490 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1491 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1492 | goto done; |
1493 | q_idx++; | |
1494 | } | |
1495 | ||
1496 | out: | |
1497 | *q_idx_p = q_idx; | |
1498 | return ret; | |
1499 | done: | |
1500 | ret = -1; | |
1501 | goto out; | |
1502 | } | |
1503 | ||
1da177e4 LT |
1504 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1505 | { | |
3b1e0a65 | 1506 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1507 | int idx, q_idx; |
1508 | int s_idx, s_q_idx; | |
1509 | struct net_device *dev; | |
49b49971 JK |
1510 | const struct nlmsghdr *nlh = cb->nlh; |
1511 | struct tcmsg *tcm = nlmsg_data(nlh); | |
1512 | struct nlattr *tca[TCA_MAX + 1]; | |
1513 | int err; | |
1da177e4 LT |
1514 | |
1515 | s_idx = cb->args[0]; | |
1516 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1517 | |
7562f876 | 1518 | idx = 0; |
15dc36eb | 1519 | ASSERT_RTNL(); |
49b49971 | 1520 | |
fceb6435 | 1521 | err = nlmsg_parse(nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); |
49b49971 JK |
1522 | if (err < 0) |
1523 | return err; | |
1524 | ||
15dc36eb | 1525 | for_each_netdev(net, dev) { |
30723673 DM |
1526 | struct netdev_queue *dev_queue; |
1527 | ||
1da177e4 | 1528 | if (idx < s_idx) |
7562f876 | 1529 | goto cont; |
1da177e4 LT |
1530 | if (idx > s_idx) |
1531 | s_q_idx = 0; | |
1da177e4 | 1532 | q_idx = 0; |
30723673 | 1533 | |
5a7a5555 | 1534 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx, |
49b49971 | 1535 | true, tca[TCA_DUMP_INVISIBLE]) < 0) |
30723673 DM |
1536 | goto done; |
1537 | ||
24824a09 ED |
1538 | dev_queue = dev_ingress_queue(dev); |
1539 | if (dev_queue && | |
1540 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
49b49971 JK |
1541 | &q_idx, s_q_idx, false, |
1542 | tca[TCA_DUMP_INVISIBLE]) < 0) | |
30723673 DM |
1543 | goto done; |
1544 | ||
7562f876 PE |
1545 | cont: |
1546 | idx++; | |
1da177e4 LT |
1547 | } |
1548 | ||
1549 | done: | |
1da177e4 LT |
1550 | cb->args[0] = idx; |
1551 | cb->args[1] = q_idx; | |
1552 | ||
1553 | return skb->len; | |
1554 | } | |
1555 | ||
1556 | ||
1557 | ||
1558 | /************************************************ | |
1559 | * Traffic classes manipulation. * | |
1560 | ************************************************/ | |
1561 | ||
1562 | ||
1563 | ||
c21ef3e3 DA |
1564 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, |
1565 | struct netlink_ext_ack *extack) | |
1da177e4 | 1566 | { |
3b1e0a65 | 1567 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1568 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1569 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1570 | struct net_device *dev; |
1571 | struct Qdisc *q = NULL; | |
20fea08b | 1572 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1573 | unsigned long cl = 0; |
1574 | unsigned long new_cl; | |
de179c8c H |
1575 | u32 portid; |
1576 | u32 clid; | |
1577 | u32 qid; | |
1da177e4 LT |
1578 | int err; |
1579 | ||
4e8bbb81 | 1580 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
5f013c9b | 1581 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1582 | return -EPERM; |
1583 | ||
c21ef3e3 | 1584 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack); |
1e90474c PM |
1585 | if (err < 0) |
1586 | return err; | |
1587 | ||
de179c8c H |
1588 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1589 | if (!dev) | |
1590 | return -ENODEV; | |
1591 | ||
1da177e4 LT |
1592 | /* |
1593 | parent == TC_H_UNSPEC - unspecified parent. | |
1594 | parent == TC_H_ROOT - class is root, which has no parent. | |
1595 | parent == X:0 - parent is root class. | |
1596 | parent == X:Y - parent is a node in hierarchy. | |
1597 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1598 | ||
1599 | handle == 0:0 - generate handle from kernel pool. | |
1600 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1601 | handle == X:Y - clear. | |
1602 | handle == X:0 - root class. | |
1603 | */ | |
1604 | ||
1605 | /* Step 1. Determine qdisc handle X:0 */ | |
1606 | ||
de179c8c H |
1607 | portid = tcm->tcm_parent; |
1608 | clid = tcm->tcm_handle; | |
1609 | qid = TC_H_MAJ(clid); | |
1610 | ||
15e47304 EB |
1611 | if (portid != TC_H_ROOT) { |
1612 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
1613 | |
1614 | if (qid && qid1) { | |
1615 | /* If both majors are known, they must be identical. */ | |
1616 | if (qid != qid1) | |
1617 | return -EINVAL; | |
1618 | } else if (qid1) { | |
1619 | qid = qid1; | |
1620 | } else if (qid == 0) | |
af356afa | 1621 | qid = dev->qdisc->handle; |
1da177e4 LT |
1622 | |
1623 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1624 | * both with parent and child. |
1625 | * | |
15e47304 | 1626 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 1627 | */ |
15e47304 EB |
1628 | if (portid) |
1629 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
1630 | } else { |
1631 | if (qid == 0) | |
af356afa | 1632 | qid = dev->qdisc->handle; |
1da177e4 LT |
1633 | } |
1634 | ||
1635 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1636 | q = qdisc_lookup(dev, qid); |
1637 | if (!q) | |
1da177e4 LT |
1638 | return -ENOENT; |
1639 | ||
1640 | /* An check that it supports classes */ | |
1641 | cops = q->ops->cl_ops; | |
1642 | if (cops == NULL) | |
1643 | return -EINVAL; | |
1644 | ||
1645 | /* Now try to get class */ | |
1646 | if (clid == 0) { | |
15e47304 | 1647 | if (portid == TC_H_ROOT) |
1da177e4 LT |
1648 | clid = qid; |
1649 | } else | |
1650 | clid = TC_H_MAKE(qid, clid); | |
1651 | ||
1652 | if (clid) | |
1653 | cl = cops->get(q, clid); | |
1654 | ||
1655 | if (cl == 0) { | |
1656 | err = -ENOENT; | |
cc7ec456 ED |
1657 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1658 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1659 | goto out; |
1660 | } else { | |
1661 | switch (n->nlmsg_type) { | |
10297b99 | 1662 | case RTM_NEWTCLASS: |
1da177e4 | 1663 | err = -EEXIST; |
cc7ec456 | 1664 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1665 | goto out; |
1666 | break; | |
1667 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1668 | err = -EOPNOTSUPP; |
1669 | if (cops->delete) | |
1670 | err = cops->delete(q, cl); | |
1da177e4 | 1671 | if (err == 0) |
5a7a5555 JHS |
1672 | tclass_notify(net, skb, n, q, cl, |
1673 | RTM_DELTCLASS); | |
1da177e4 LT |
1674 | goto out; |
1675 | case RTM_GETTCLASS: | |
7316ae88 | 1676 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1677 | goto out; |
1678 | default: | |
1679 | err = -EINVAL; | |
1680 | goto out; | |
1681 | } | |
1682 | } | |
1683 | ||
1684 | new_cl = cl; | |
de6d5cdf PM |
1685 | err = -EOPNOTSUPP; |
1686 | if (cops->change) | |
15e47304 | 1687 | err = cops->change(q, clid, portid, tca, &new_cl); |
1da177e4 | 1688 | if (err == 0) |
7316ae88 | 1689 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1690 | |
1691 | out: | |
1692 | if (cl) | |
1693 | cops->put(q, cl); | |
1694 | ||
1695 | return err; | |
1696 | } | |
1697 | ||
1698 | ||
1699 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1700 | unsigned long cl, | |
15e47304 | 1701 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1702 | { |
1703 | struct tcmsg *tcm; | |
1704 | struct nlmsghdr *nlh; | |
27a884dc | 1705 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1706 | struct gnet_dump d; |
20fea08b | 1707 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1708 | |
fba373d2 | 1709 | cond_resched(); |
15e47304 | 1710 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1711 | if (!nlh) |
1712 | goto out_nlmsg_trim; | |
1713 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1714 | tcm->tcm_family = AF_UNSPEC; |
16ebb5e0 ED |
1715 | tcm->tcm__pad1 = 0; |
1716 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1717 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1718 | tcm->tcm_parent = q->handle; |
1719 | tcm->tcm_handle = q->handle; | |
1720 | tcm->tcm_info = 0; | |
1b34ec43 DM |
1721 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1722 | goto nla_put_failure; | |
1da177e4 | 1723 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1724 | goto nla_put_failure; |
1da177e4 | 1725 | |
102396ae | 1726 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
edb09eb1 | 1727 | NULL, &d, TCA_PAD) < 0) |
1e90474c | 1728 | goto nla_put_failure; |
1da177e4 LT |
1729 | |
1730 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1731 | goto nla_put_failure; |
1da177e4 LT |
1732 | |
1733 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1734 | goto nla_put_failure; |
1da177e4 | 1735 | |
27a884dc | 1736 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1737 | return skb->len; |
1738 | ||
02ef22ca | 1739 | out_nlmsg_trim: |
1e90474c | 1740 | nla_put_failure: |
dc5fc579 | 1741 | nlmsg_trim(skb, b); |
1da177e4 LT |
1742 | return -1; |
1743 | } | |
1744 | ||
7316ae88 TG |
1745 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1746 | struct nlmsghdr *n, struct Qdisc *q, | |
1747 | unsigned long cl, int event) | |
1da177e4 LT |
1748 | { |
1749 | struct sk_buff *skb; | |
15e47304 | 1750 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1751 | |
1752 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1753 | if (!skb) | |
1754 | return -ENOBUFS; | |
1755 | ||
15e47304 | 1756 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { |
1da177e4 LT |
1757 | kfree_skb(skb); |
1758 | return -EINVAL; | |
1759 | } | |
1760 | ||
15e47304 | 1761 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1762 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1763 | } |
1764 | ||
cc7ec456 ED |
1765 | struct qdisc_dump_args { |
1766 | struct qdisc_walker w; | |
1767 | struct sk_buff *skb; | |
1768 | struct netlink_callback *cb; | |
1da177e4 LT |
1769 | }; |
1770 | ||
5a7a5555 JHS |
1771 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, |
1772 | struct qdisc_walker *arg) | |
1da177e4 LT |
1773 | { |
1774 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1775 | ||
15e47304 | 1776 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
1777 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1778 | RTM_NEWTCLASS); | |
1da177e4 LT |
1779 | } |
1780 | ||
30723673 DM |
1781 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1782 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1783 | int *t_p, int s_t) | |
1784 | { | |
1785 | struct qdisc_dump_args arg; | |
1786 | ||
49b49971 | 1787 | if (tc_qdisc_dump_ignore(q, false) || |
30723673 DM |
1788 | *t_p < s_t || !q->ops->cl_ops || |
1789 | (tcm->tcm_parent && | |
1790 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1791 | (*t_p)++; | |
1792 | return 0; | |
1793 | } | |
1794 | if (*t_p > s_t) | |
1795 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1796 | arg.w.fn = qdisc_class_dump; | |
1797 | arg.skb = skb; | |
1798 | arg.cb = cb; | |
1799 | arg.w.stop = 0; | |
1800 | arg.w.skip = cb->args[1]; | |
1801 | arg.w.count = 0; | |
1802 | q->ops->cl_ops->walk(q, &arg.w); | |
1803 | cb->args[1] = arg.w.count; | |
1804 | if (arg.w.stop) | |
1805 | return -1; | |
1806 | (*t_p)++; | |
1807 | return 0; | |
1808 | } | |
1809 | ||
1810 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1811 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1812 | int *t_p, int s_t) | |
1813 | { | |
1814 | struct Qdisc *q; | |
59cc1f61 | 1815 | int b; |
30723673 DM |
1816 | |
1817 | if (!root) | |
1818 | return 0; | |
1819 | ||
1820 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1821 | return -1; | |
1822 | ||
69012ae4 JK |
1823 | if (!qdisc_dev(root)) |
1824 | return 0; | |
1825 | ||
cb395b20 ED |
1826 | if (tcm->tcm_parent) { |
1827 | q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent)); | |
1828 | if (q && tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1829 | return -1; | |
1830 | return 0; | |
1831 | } | |
59cc1f61 | 1832 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1833 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
1834 | return -1; | |
1835 | } | |
1836 | ||
1837 | return 0; | |
1838 | } | |
1839 | ||
1da177e4 LT |
1840 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1841 | { | |
02ef22ca | 1842 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 1843 | struct net *net = sock_net(skb->sk); |
30723673 | 1844 | struct netdev_queue *dev_queue; |
1da177e4 | 1845 | struct net_device *dev; |
30723673 | 1846 | int t, s_t; |
1da177e4 | 1847 | |
573ce260 | 1848 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1849 | return 0; |
cc7ec456 ED |
1850 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
1851 | if (!dev) | |
1da177e4 LT |
1852 | return 0; |
1853 | ||
1854 | s_t = cb->args[0]; | |
1855 | t = 0; | |
1856 | ||
af356afa | 1857 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1858 | goto done; |
1859 | ||
24824a09 ED |
1860 | dev_queue = dev_ingress_queue(dev); |
1861 | if (dev_queue && | |
1862 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
1863 | &t, s_t) < 0) | |
30723673 | 1864 | goto done; |
1da177e4 | 1865 | |
30723673 | 1866 | done: |
1da177e4 LT |
1867 | cb->args[0] = t; |
1868 | ||
1869 | dev_put(dev); | |
1870 | return skb->len; | |
1871 | } | |
1872 | ||
1da177e4 LT |
1873 | #ifdef CONFIG_PROC_FS |
1874 | static int psched_show(struct seq_file *seq, void *v) | |
1875 | { | |
1876 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 1877 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1878 | 1000000, |
1e317688 | 1879 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
1880 | |
1881 | return 0; | |
1882 | } | |
1883 | ||
1884 | static int psched_open(struct inode *inode, struct file *file) | |
1885 | { | |
7e5ab157 | 1886 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1887 | } |
1888 | ||
da7071d7 | 1889 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1890 | .owner = THIS_MODULE, |
1891 | .open = psched_open, | |
1892 | .read = seq_read, | |
1893 | .llseek = seq_lseek, | |
1894 | .release = single_release, | |
10297b99 | 1895 | }; |
7316ae88 TG |
1896 | |
1897 | static int __net_init psched_net_init(struct net *net) | |
1898 | { | |
1899 | struct proc_dir_entry *e; | |
1900 | ||
d4beaa66 | 1901 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
7316ae88 TG |
1902 | if (e == NULL) |
1903 | return -ENOMEM; | |
1904 | ||
1905 | return 0; | |
1906 | } | |
1907 | ||
1908 | static void __net_exit psched_net_exit(struct net *net) | |
1909 | { | |
ece31ffd | 1910 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
1911 | } |
1912 | #else | |
1913 | static int __net_init psched_net_init(struct net *net) | |
1914 | { | |
1915 | return 0; | |
1916 | } | |
1917 | ||
1918 | static void __net_exit psched_net_exit(struct net *net) | |
1919 | { | |
1920 | } | |
1da177e4 LT |
1921 | #endif |
1922 | ||
7316ae88 TG |
1923 | static struct pernet_operations psched_net_ops = { |
1924 | .init = psched_net_init, | |
1925 | .exit = psched_net_exit, | |
1926 | }; | |
1927 | ||
1da177e4 LT |
1928 | static int __init pktsched_init(void) |
1929 | { | |
7316ae88 TG |
1930 | int err; |
1931 | ||
1932 | err = register_pernet_subsys(&psched_net_ops); | |
1933 | if (err) { | |
cc7ec456 | 1934 | pr_err("pktsched_init: " |
7316ae88 TG |
1935 | "cannot initialize per netns operations\n"); |
1936 | return err; | |
1937 | } | |
1938 | ||
6da7c8fc | 1939 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
1940 | register_qdisc(&pfifo_qdisc_ops); |
1941 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1942 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1943 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 1944 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 1945 | |
b97bac64 FW |
1946 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0); |
1947 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0); | |
5a7a5555 | 1948 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, |
b97bac64 FW |
1949 | 0); |
1950 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0); | |
1951 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0); | |
5a7a5555 | 1952 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, |
b97bac64 | 1953 | 0); |
be577ddc | 1954 | |
1da177e4 LT |
1955 | return 0; |
1956 | } | |
1957 | ||
1958 | subsys_initcall(pktsched_init); |