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 | ||
1da177e4 LT |
39 | /* |
40 | ||
41 | Short review. | |
42 | ------------- | |
43 | ||
44 | This file consists of two interrelated parts: | |
45 | ||
46 | 1. queueing disciplines manager frontend. | |
47 | 2. traffic classes manager frontend. | |
48 | ||
49 | Generally, queueing discipline ("qdisc") is a black box, | |
50 | which is able to enqueue packets and to dequeue them (when | |
51 | device is ready to send something) in order and at times | |
52 | determined by algorithm hidden in it. | |
53 | ||
54 | qdisc's are divided to two categories: | |
55 | - "queues", which have no internal structure visible from outside. | |
56 | - "schedulers", which split all the packets to "traffic classes", | |
57 | using "packet classifiers" (look at cls_api.c) | |
58 | ||
59 | In turn, classes may have child qdiscs (as rule, queues) | |
60 | attached to them etc. etc. etc. | |
61 | ||
62 | The goal of the routines in this file is to translate | |
63 | information supplied by user in the form of handles | |
64 | to more intelligible for kernel form, to make some sanity | |
65 | checks and part of work, which is common to all qdiscs | |
66 | and to provide rtnetlink notifications. | |
67 | ||
68 | All real intelligent work is done inside qdisc modules. | |
69 | ||
70 | ||
71 | ||
72 | Every discipline has two major routines: enqueue and dequeue. | |
73 | ||
74 | ---dequeue | |
75 | ||
76 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
77 | but it does not mean that queue is empty, it just means that | |
78 | discipline does not want to send anything this time. | |
79 | Queue is really empty if q->q.qlen == 0. | |
80 | For complicated disciplines with multiple queues q->q is not | |
81 | real packet queue, but however q->q.qlen must be valid. | |
82 | ||
83 | ---enqueue | |
84 | ||
85 | enqueue returns 0, if packet was enqueued successfully. | |
86 | If packet (this one or another one) was dropped, it returns | |
87 | not zero error code. | |
88 | NET_XMIT_DROP - this packet dropped | |
89 | Expected action: do not backoff, but wait until queue will clear. | |
90 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
91 | Expected action: backoff or ignore | |
1da177e4 LT |
92 | |
93 | Auxiliary routines: | |
94 | ||
99c0db26 JP |
95 | ---peek |
96 | ||
97 | like dequeue but without removing a packet from the queue | |
98 | ||
1da177e4 LT |
99 | ---reset |
100 | ||
101 | returns qdisc to initial state: purge all buffers, clear all | |
102 | timers, counters (except for statistics) etc. | |
103 | ||
104 | ---init | |
105 | ||
106 | initializes newly created qdisc. | |
107 | ||
108 | ---destroy | |
109 | ||
110 | destroys resources allocated by init and during lifetime of qdisc. | |
111 | ||
112 | ---change | |
113 | ||
114 | changes qdisc parameters. | |
115 | */ | |
116 | ||
117 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
118 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
119 | ||
120 | ||
121 | /************************************************ | |
122 | * Queueing disciplines manipulation. * | |
123 | ************************************************/ | |
124 | ||
125 | ||
126 | /* The list of all installed queueing disciplines. */ | |
127 | ||
128 | static struct Qdisc_ops *qdisc_base; | |
129 | ||
21eb2189 | 130 | /* Register/unregister queueing discipline */ |
1da177e4 LT |
131 | |
132 | int register_qdisc(struct Qdisc_ops *qops) | |
133 | { | |
134 | struct Qdisc_ops *q, **qp; | |
135 | int rc = -EEXIST; | |
136 | ||
137 | write_lock(&qdisc_mod_lock); | |
138 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
139 | if (!strcmp(qops->id, q->id)) | |
140 | goto out; | |
141 | ||
142 | if (qops->enqueue == NULL) | |
143 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 | 144 | if (qops->peek == NULL) { |
68fd26b5 | 145 | if (qops->dequeue == NULL) |
99c0db26 | 146 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
147 | else |
148 | goto out_einval; | |
99c0db26 | 149 | } |
1da177e4 LT |
150 | if (qops->dequeue == NULL) |
151 | qops->dequeue = noop_qdisc_ops.dequeue; | |
152 | ||
68fd26b5 JP |
153 | if (qops->cl_ops) { |
154 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
155 | ||
143976ce | 156 | if (!(cops->find && cops->walk && cops->leaf)) |
68fd26b5 JP |
157 | goto out_einval; |
158 | ||
6529eaba | 159 | if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf)) |
68fd26b5 JP |
160 | goto out_einval; |
161 | } | |
162 | ||
1da177e4 LT |
163 | qops->next = NULL; |
164 | *qp = qops; | |
165 | rc = 0; | |
166 | out: | |
167 | write_unlock(&qdisc_mod_lock); | |
168 | return rc; | |
68fd26b5 JP |
169 | |
170 | out_einval: | |
171 | rc = -EINVAL; | |
172 | goto out; | |
1da177e4 | 173 | } |
62e3ba1b | 174 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
175 | |
176 | int unregister_qdisc(struct Qdisc_ops *qops) | |
177 | { | |
178 | struct Qdisc_ops *q, **qp; | |
179 | int err = -ENOENT; | |
180 | ||
181 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 182 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
183 | if (q == qops) |
184 | break; | |
185 | if (q) { | |
186 | *qp = q->next; | |
187 | q->next = NULL; | |
188 | err = 0; | |
189 | } | |
190 | write_unlock(&qdisc_mod_lock); | |
191 | return err; | |
192 | } | |
62e3ba1b | 193 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 | 194 | |
6da7c8fc | 195 | /* Get default qdisc if not otherwise specified */ |
196 | void qdisc_get_default(char *name, size_t len) | |
197 | { | |
198 | read_lock(&qdisc_mod_lock); | |
199 | strlcpy(name, default_qdisc_ops->id, len); | |
200 | read_unlock(&qdisc_mod_lock); | |
201 | } | |
202 | ||
203 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) | |
204 | { | |
205 | struct Qdisc_ops *q = NULL; | |
206 | ||
207 | for (q = qdisc_base; q; q = q->next) { | |
208 | if (!strcmp(name, q->id)) { | |
209 | if (!try_module_get(q->owner)) | |
210 | q = NULL; | |
211 | break; | |
212 | } | |
213 | } | |
214 | ||
215 | return q; | |
216 | } | |
217 | ||
218 | /* Set new default qdisc to use */ | |
219 | int qdisc_set_default(const char *name) | |
220 | { | |
221 | const struct Qdisc_ops *ops; | |
222 | ||
223 | if (!capable(CAP_NET_ADMIN)) | |
224 | return -EPERM; | |
225 | ||
226 | write_lock(&qdisc_mod_lock); | |
227 | ops = qdisc_lookup_default(name); | |
228 | if (!ops) { | |
229 | /* Not found, drop lock and try to load module */ | |
230 | write_unlock(&qdisc_mod_lock); | |
231 | request_module("sch_%s", name); | |
232 | write_lock(&qdisc_mod_lock); | |
233 | ||
234 | ops = qdisc_lookup_default(name); | |
235 | } | |
236 | ||
237 | if (ops) { | |
238 | /* Set new default */ | |
239 | module_put(default_qdisc_ops->owner); | |
240 | default_qdisc_ops = ops; | |
241 | } | |
242 | write_unlock(&qdisc_mod_lock); | |
243 | ||
244 | return ops ? 0 : -ENOENT; | |
245 | } | |
246 | ||
8ea3e439 | 247 | #ifdef CONFIG_NET_SCH_DEFAULT |
248 | /* Set default value from kernel config */ | |
249 | static int __init sch_default_qdisc(void) | |
250 | { | |
251 | return qdisc_set_default(CONFIG_DEFAULT_NET_SCH); | |
252 | } | |
253 | late_initcall(sch_default_qdisc); | |
254 | #endif | |
255 | ||
1da177e4 | 256 | /* We know handle. Find qdisc among all qdisc's attached to device |
4eaf3b84 ED |
257 | * (root qdisc, all its children, children of children etc.) |
258 | * Note: caller either uses rtnl or rcu_read_lock() | |
1da177e4 LT |
259 | */ |
260 | ||
6113b748 | 261 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
262 | { |
263 | struct Qdisc *q; | |
264 | ||
69012ae4 JK |
265 | if (!qdisc_dev(root)) |
266 | return (root->handle == handle ? root : NULL); | |
267 | ||
8123b421 DM |
268 | if (!(root->flags & TCQ_F_BUILTIN) && |
269 | root->handle == handle) | |
270 | return root; | |
271 | ||
59cc1f61 | 272 | hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) { |
8123b421 DM |
273 | if (q->handle == handle) |
274 | return q; | |
275 | } | |
276 | return NULL; | |
277 | } | |
278 | ||
49b49971 | 279 | void qdisc_hash_add(struct Qdisc *q, bool invisible) |
f6e0b239 | 280 | { |
37314363 | 281 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
4eaf3b84 | 282 | ASSERT_RTNL(); |
59cc1f61 | 283 | hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle); |
49b49971 JK |
284 | if (invisible) |
285 | q->flags |= TCQ_F_INVISIBLE; | |
37314363 | 286 | } |
f6e0b239 | 287 | } |
59cc1f61 | 288 | EXPORT_SYMBOL(qdisc_hash_add); |
f6e0b239 | 289 | |
59cc1f61 | 290 | void qdisc_hash_del(struct Qdisc *q) |
f6e0b239 | 291 | { |
4eaf3b84 ED |
292 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
293 | ASSERT_RTNL(); | |
59cc1f61 | 294 | hash_del_rcu(&q->hash); |
4eaf3b84 | 295 | } |
f6e0b239 | 296 | } |
59cc1f61 | 297 | EXPORT_SYMBOL(qdisc_hash_del); |
f6e0b239 | 298 | |
ead81cc5 | 299 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 300 | { |
f6e0b239 JP |
301 | struct Qdisc *q; |
302 | ||
af356afa PM |
303 | q = qdisc_match_from_root(dev->qdisc, handle); |
304 | if (q) | |
305 | goto out; | |
f6e0b239 | 306 | |
24824a09 ED |
307 | if (dev_ingress_queue(dev)) |
308 | q = qdisc_match_from_root( | |
309 | dev_ingress_queue(dev)->qdisc_sleeping, | |
310 | handle); | |
f6486d40 | 311 | out: |
f6e0b239 | 312 | return q; |
1da177e4 LT |
313 | } |
314 | ||
315 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
316 | { | |
317 | unsigned long cl; | |
318 | struct Qdisc *leaf; | |
20fea08b | 319 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
320 | |
321 | if (cops == NULL) | |
322 | return NULL; | |
143976ce | 323 | cl = cops->find(p, classid); |
1da177e4 LT |
324 | |
325 | if (cl == 0) | |
326 | return NULL; | |
327 | leaf = cops->leaf(p, cl); | |
1da177e4 LT |
328 | return leaf; |
329 | } | |
330 | ||
331 | /* Find queueing discipline by name */ | |
332 | ||
1e90474c | 333 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
334 | { |
335 | struct Qdisc_ops *q = NULL; | |
336 | ||
337 | if (kind) { | |
338 | read_lock(&qdisc_mod_lock); | |
339 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 340 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
341 | if (!try_module_get(q->owner)) |
342 | q = NULL; | |
343 | break; | |
344 | } | |
345 | } | |
346 | read_unlock(&qdisc_mod_lock); | |
347 | } | |
348 | return q; | |
349 | } | |
350 | ||
8a8e3d84 JDB |
351 | /* The linklayer setting were not transferred from iproute2, in older |
352 | * versions, and the rate tables lookup systems have been dropped in | |
353 | * the kernel. To keep backward compatible with older iproute2 tc | |
354 | * utils, we detect the linklayer setting by detecting if the rate | |
355 | * table were modified. | |
356 | * | |
357 | * For linklayer ATM table entries, the rate table will be aligned to | |
358 | * 48 bytes, thus some table entries will contain the same value. The | |
359 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
360 | * starting from the mpu, we find low and high table entries for | |
361 | * mapping this cell. If these entries contain the same value, when | |
362 | * the rate tables have been modified for linklayer ATM. | |
363 | * | |
364 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
365 | * and then roundup to the next cell, calc the table entry one below, | |
366 | * and compare. | |
367 | */ | |
368 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
369 | { | |
370 | int low = roundup(r->mpu, 48); | |
371 | int high = roundup(low+1, 48); | |
372 | int cell_low = low >> r->cell_log; | |
373 | int cell_high = (high >> r->cell_log) - 1; | |
374 | ||
375 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
376 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
377 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
378 | return TC_LINKLAYER_ETHERNET; | |
379 | } | |
380 | ||
381 | if ((cell_high > cell_low) && (cell_high < 256) | |
382 | && (rtab[cell_low] == rtab[cell_high])) { | |
383 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
384 | cell_low, cell_high, rtab[cell_high]); | |
385 | return TC_LINKLAYER_ATM; | |
386 | } | |
387 | return TC_LINKLAYER_ETHERNET; | |
388 | } | |
389 | ||
1da177e4 LT |
390 | static struct qdisc_rate_table *qdisc_rtab_list; |
391 | ||
5a7a5555 JHS |
392 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
393 | struct nlattr *tab) | |
1da177e4 LT |
394 | { |
395 | struct qdisc_rate_table *rtab; | |
396 | ||
40edeff6 ED |
397 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
398 | nla_len(tab) != TC_RTAB_SIZE) | |
399 | return NULL; | |
400 | ||
1da177e4 | 401 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
402 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
403 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
404 | rtab->refcnt++; |
405 | return rtab; | |
406 | } | |
407 | } | |
408 | ||
1da177e4 LT |
409 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
410 | if (rtab) { | |
411 | rtab->rate = *r; | |
412 | rtab->refcnt = 1; | |
1e90474c | 413 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
414 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
415 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
416 | rtab->next = qdisc_rtab_list; |
417 | qdisc_rtab_list = rtab; | |
418 | } | |
419 | return rtab; | |
420 | } | |
62e3ba1b | 421 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
422 | |
423 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
424 | { | |
425 | struct qdisc_rate_table *rtab, **rtabp; | |
426 | ||
427 | if (!tab || --tab->refcnt) | |
428 | return; | |
429 | ||
cc7ec456 ED |
430 | for (rtabp = &qdisc_rtab_list; |
431 | (rtab = *rtabp) != NULL; | |
432 | rtabp = &rtab->next) { | |
1da177e4 LT |
433 | if (rtab == tab) { |
434 | *rtabp = rtab->next; | |
435 | kfree(rtab); | |
436 | return; | |
437 | } | |
438 | } | |
439 | } | |
62e3ba1b | 440 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 441 | |
175f9c1b | 442 | static LIST_HEAD(qdisc_stab_list); |
175f9c1b JK |
443 | |
444 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
445 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
446 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
447 | }; | |
448 | ||
449 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
450 | { | |
451 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
452 | struct qdisc_size_table *stab; | |
453 | struct tc_sizespec *s; | |
454 | unsigned int tsize = 0; | |
455 | u16 *tab = NULL; | |
456 | int err; | |
457 | ||
fceb6435 | 458 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, NULL); |
175f9c1b JK |
459 | if (err < 0) |
460 | return ERR_PTR(err); | |
461 | if (!tb[TCA_STAB_BASE]) | |
462 | return ERR_PTR(-EINVAL); | |
463 | ||
464 | s = nla_data(tb[TCA_STAB_BASE]); | |
465 | ||
466 | if (s->tsize > 0) { | |
467 | if (!tb[TCA_STAB_DATA]) | |
468 | return ERR_PTR(-EINVAL); | |
469 | tab = nla_data(tb[TCA_STAB_DATA]); | |
470 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
471 | } | |
472 | ||
00093fab | 473 | if (tsize != s->tsize || (!tab && tsize > 0)) |
175f9c1b JK |
474 | return ERR_PTR(-EINVAL); |
475 | ||
175f9c1b JK |
476 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
477 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
478 | continue; | |
479 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
480 | continue; | |
481 | stab->refcnt++; | |
175f9c1b JK |
482 | return stab; |
483 | } | |
484 | ||
175f9c1b JK |
485 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); |
486 | if (!stab) | |
487 | return ERR_PTR(-ENOMEM); | |
488 | ||
489 | stab->refcnt = 1; | |
490 | stab->szopts = *s; | |
491 | if (tsize > 0) | |
492 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
493 | ||
175f9c1b | 494 | list_add_tail(&stab->list, &qdisc_stab_list); |
175f9c1b JK |
495 | |
496 | return stab; | |
497 | } | |
498 | ||
a2da570d ED |
499 | static void stab_kfree_rcu(struct rcu_head *head) |
500 | { | |
501 | kfree(container_of(head, struct qdisc_size_table, rcu)); | |
502 | } | |
503 | ||
175f9c1b JK |
504 | void qdisc_put_stab(struct qdisc_size_table *tab) |
505 | { | |
506 | if (!tab) | |
507 | return; | |
508 | ||
175f9c1b JK |
509 | if (--tab->refcnt == 0) { |
510 | list_del(&tab->list); | |
a2da570d | 511 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
175f9c1b | 512 | } |
175f9c1b JK |
513 | } |
514 | EXPORT_SYMBOL(qdisc_put_stab); | |
515 | ||
516 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
517 | { | |
518 | struct nlattr *nest; | |
519 | ||
520 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
521 | if (nest == NULL) |
522 | goto nla_put_failure; | |
1b34ec43 DM |
523 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
524 | goto nla_put_failure; | |
175f9c1b JK |
525 | nla_nest_end(skb, nest); |
526 | ||
527 | return skb->len; | |
528 | ||
529 | nla_put_failure: | |
530 | return -1; | |
531 | } | |
532 | ||
5a7a5555 JHS |
533 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
534 | const struct qdisc_size_table *stab) | |
175f9c1b JK |
535 | { |
536 | int pkt_len, slot; | |
537 | ||
538 | pkt_len = skb->len + stab->szopts.overhead; | |
539 | if (unlikely(!stab->szopts.tsize)) | |
540 | goto out; | |
541 | ||
542 | slot = pkt_len + stab->szopts.cell_align; | |
543 | if (unlikely(slot < 0)) | |
544 | slot = 0; | |
545 | ||
546 | slot >>= stab->szopts.cell_log; | |
547 | if (likely(slot < stab->szopts.tsize)) | |
548 | pkt_len = stab->data[slot]; | |
549 | else | |
550 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
551 | (slot / stab->szopts.tsize) + | |
552 | stab->data[slot % stab->szopts.tsize]; | |
553 | ||
554 | pkt_len <<= stab->szopts.size_log; | |
555 | out: | |
556 | if (unlikely(pkt_len < 1)) | |
557 | pkt_len = 1; | |
558 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
559 | } | |
a2da570d | 560 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 561 | |
6e765a00 | 562 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
563 | { |
564 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
565 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
566 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
567 | qdisc->flags |= TCQ_F_WARN_NONWC; |
568 | } | |
569 | } | |
570 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
571 | ||
4179477f PM |
572 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
573 | { | |
574 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 575 | timer); |
4179477f | 576 | |
1e203c1a | 577 | rcu_read_lock(); |
8608db03 | 578 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 579 | rcu_read_unlock(); |
1936502d | 580 | |
4179477f PM |
581 | return HRTIMER_NORESTART; |
582 | } | |
583 | ||
584 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
585 | { | |
4a8e320c | 586 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 587 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
588 | wd->qdisc = qdisc; |
589 | } | |
590 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
591 | ||
45f50bed | 592 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires) |
4179477f | 593 | { |
2540e051 JP |
594 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
595 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
596 | return; | |
597 | ||
a9efad8b ED |
598 | if (wd->last_expires == expires) |
599 | return; | |
600 | ||
601 | wd->last_expires = expires; | |
46baac38 | 602 | hrtimer_start(&wd->timer, |
34c5d292 | 603 | ns_to_ktime(expires), |
4a8e320c | 604 | HRTIMER_MODE_ABS_PINNED); |
4179477f | 605 | } |
34c5d292 | 606 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
4179477f PM |
607 | |
608 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
609 | { | |
2fbd3da3 | 610 | hrtimer_cancel(&wd->timer); |
4179477f PM |
611 | } |
612 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 613 | |
a94f779f | 614 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 | 615 | { |
6fe1c7a5 | 616 | struct hlist_head *h; |
9695fe6f | 617 | unsigned int i; |
6fe1c7a5 | 618 | |
9695fe6f | 619 | h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL); |
6fe1c7a5 PM |
620 | |
621 | if (h != NULL) { | |
622 | for (i = 0; i < n; i++) | |
623 | INIT_HLIST_HEAD(&h[i]); | |
624 | } | |
625 | return h; | |
626 | } | |
627 | ||
6fe1c7a5 PM |
628 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) |
629 | { | |
630 | struct Qdisc_class_common *cl; | |
b67bfe0d | 631 | struct hlist_node *next; |
6fe1c7a5 PM |
632 | struct hlist_head *nhash, *ohash; |
633 | unsigned int nsize, nmask, osize; | |
634 | unsigned int i, h; | |
635 | ||
636 | /* Rehash when load factor exceeds 0.75 */ | |
637 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
638 | return; | |
639 | nsize = clhash->hashsize * 2; | |
640 | nmask = nsize - 1; | |
641 | nhash = qdisc_class_hash_alloc(nsize); | |
642 | if (nhash == NULL) | |
643 | return; | |
644 | ||
645 | ohash = clhash->hash; | |
646 | osize = clhash->hashsize; | |
647 | ||
648 | sch_tree_lock(sch); | |
649 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 650 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
651 | h = qdisc_class_hash(cl->classid, nmask); |
652 | hlist_add_head(&cl->hnode, &nhash[h]); | |
653 | } | |
654 | } | |
655 | clhash->hash = nhash; | |
656 | clhash->hashsize = nsize; | |
657 | clhash->hashmask = nmask; | |
658 | sch_tree_unlock(sch); | |
659 | ||
9695fe6f | 660 | kvfree(ohash); |
6fe1c7a5 PM |
661 | } |
662 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
663 | ||
664 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
665 | { | |
666 | unsigned int size = 4; | |
667 | ||
668 | clhash->hash = qdisc_class_hash_alloc(size); | |
669 | if (clhash->hash == NULL) | |
670 | return -ENOMEM; | |
671 | clhash->hashsize = size; | |
672 | clhash->hashmask = size - 1; | |
673 | clhash->hashelems = 0; | |
674 | return 0; | |
675 | } | |
676 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
677 | ||
678 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
679 | { | |
9695fe6f | 680 | kvfree(clhash->hash); |
6fe1c7a5 PM |
681 | } |
682 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
683 | ||
684 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
685 | struct Qdisc_class_common *cl) | |
686 | { | |
687 | unsigned int h; | |
688 | ||
689 | INIT_HLIST_NODE(&cl->hnode); | |
690 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
691 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
692 | clhash->hashelems++; | |
693 | } | |
694 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
695 | ||
696 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
697 | struct Qdisc_class_common *cl) | |
698 | { | |
699 | hlist_del(&cl->hnode); | |
700 | clhash->hashelems--; | |
701 | } | |
702 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
703 | ||
fa0f5aa7 ED |
704 | /* Allocate an unique handle from space managed by kernel |
705 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
706 | */ | |
1da177e4 LT |
707 | static u32 qdisc_alloc_handle(struct net_device *dev) |
708 | { | |
fa0f5aa7 | 709 | int i = 0x8000; |
1da177e4 LT |
710 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
711 | ||
712 | do { | |
713 | autohandle += TC_H_MAKE(0x10000U, 0); | |
714 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
715 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
716 | if (!qdisc_lookup(dev, autohandle)) |
717 | return autohandle; | |
718 | cond_resched(); | |
719 | } while (--i > 0); | |
1da177e4 | 720 | |
fa0f5aa7 | 721 | return 0; |
1da177e4 LT |
722 | } |
723 | ||
2ccccf5f WC |
724 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, unsigned int n, |
725 | unsigned int len) | |
43effa1e | 726 | { |
20fea08b | 727 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
728 | unsigned long cl; |
729 | u32 parentid; | |
95946658 | 730 | bool notify; |
2c8c8e6f | 731 | int drops; |
43effa1e | 732 | |
2ccccf5f | 733 | if (n == 0 && len == 0) |
43effa1e | 734 | return; |
2c8c8e6f | 735 | drops = max_t(int, n, 0); |
4eaf3b84 | 736 | rcu_read_lock(); |
43effa1e | 737 | while ((parentid = sch->parent)) { |
066a3b5b | 738 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 739 | break; |
066a3b5b | 740 | |
4eaf3b84 ED |
741 | if (sch->flags & TCQ_F_NOPARENT) |
742 | break; | |
95946658 KK |
743 | /* Notify parent qdisc only if child qdisc becomes empty. |
744 | * | |
745 | * If child was empty even before update then backlog | |
746 | * counter is screwed and we skip notification because | |
747 | * parent class is already passive. | |
748 | */ | |
749 | notify = !sch->q.qlen && !WARN_ON_ONCE(!n); | |
4eaf3b84 | 750 | /* TODO: perform the search on a per txq basis */ |
5ce2d488 | 751 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 752 | if (sch == NULL) { |
4eaf3b84 ED |
753 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
754 | break; | |
ffc8fefa | 755 | } |
43effa1e | 756 | cops = sch->ops->cl_ops; |
95946658 | 757 | if (notify && cops->qlen_notify) { |
143976ce | 758 | cl = cops->find(sch, parentid); |
43effa1e | 759 | cops->qlen_notify(sch, cl); |
43effa1e PM |
760 | } |
761 | sch->q.qlen -= n; | |
2ccccf5f | 762 | sch->qstats.backlog -= len; |
25331d6c | 763 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 764 | } |
4eaf3b84 | 765 | rcu_read_unlock(); |
43effa1e | 766 | } |
2ccccf5f | 767 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
1da177e4 | 768 | |
27d7f07c WC |
769 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, |
770 | u32 portid, u32 seq, u16 flags, int event) | |
771 | { | |
772 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; | |
773 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; | |
774 | struct tcmsg *tcm; | |
775 | struct nlmsghdr *nlh; | |
776 | unsigned char *b = skb_tail_pointer(skb); | |
777 | struct gnet_dump d; | |
778 | struct qdisc_size_table *stab; | |
779 | __u32 qlen; | |
780 | ||
781 | cond_resched(); | |
782 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
783 | if (!nlh) | |
784 | goto out_nlmsg_trim; | |
785 | tcm = nlmsg_data(nlh); | |
786 | tcm->tcm_family = AF_UNSPEC; | |
787 | tcm->tcm__pad1 = 0; | |
788 | tcm->tcm__pad2 = 0; | |
789 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
790 | tcm->tcm_parent = clid; | |
791 | tcm->tcm_handle = q->handle; | |
792 | tcm->tcm_info = refcount_read(&q->refcnt); | |
793 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
794 | goto nla_put_failure; | |
795 | if (q->ops->dump && q->ops->dump(q, skb) < 0) | |
796 | goto nla_put_failure; | |
797 | qlen = q->q.qlen; | |
798 | ||
799 | stab = rtnl_dereference(q->stab); | |
800 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
801 | goto nla_put_failure; | |
802 | ||
803 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
804 | NULL, &d, TCA_PAD) < 0) | |
805 | goto nla_put_failure; | |
806 | ||
807 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
808 | goto nla_put_failure; | |
809 | ||
810 | if (qdisc_is_percpu_stats(q)) { | |
811 | cpu_bstats = q->cpu_bstats; | |
812 | cpu_qstats = q->cpu_qstats; | |
813 | } | |
814 | ||
815 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q), | |
816 | &d, cpu_bstats, &q->bstats) < 0 || | |
817 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || | |
818 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) | |
819 | goto nla_put_failure; | |
820 | ||
821 | if (gnet_stats_finish_copy(&d) < 0) | |
822 | goto nla_put_failure; | |
823 | ||
824 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
825 | return skb->len; | |
826 | ||
827 | out_nlmsg_trim: | |
828 | nla_put_failure: | |
829 | nlmsg_trim(skb, b); | |
830 | return -1; | |
831 | } | |
832 | ||
833 | static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible) | |
834 | { | |
835 | if (q->flags & TCQ_F_BUILTIN) | |
836 | return true; | |
837 | if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible) | |
838 | return true; | |
839 | ||
840 | return false; | |
841 | } | |
842 | ||
843 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, | |
844 | struct nlmsghdr *n, u32 clid, | |
845 | struct Qdisc *old, struct Qdisc *new) | |
846 | { | |
847 | struct sk_buff *skb; | |
848 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
849 | ||
850 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
851 | if (!skb) | |
852 | return -ENOBUFS; | |
853 | ||
854 | if (old && !tc_qdisc_dump_ignore(old, false)) { | |
855 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, | |
856 | 0, RTM_DELQDISC) < 0) | |
857 | goto err_out; | |
858 | } | |
859 | if (new && !tc_qdisc_dump_ignore(new, false)) { | |
860 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, | |
861 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
862 | goto err_out; | |
863 | } | |
864 | ||
865 | if (skb->len) | |
866 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
867 | n->nlmsg_flags & NLM_F_ECHO); | |
868 | ||
869 | err_out: | |
870 | kfree_skb(skb); | |
871 | return -EINVAL; | |
872 | } | |
873 | ||
7316ae88 TG |
874 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
875 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
876 | struct Qdisc *old, struct Qdisc *new) |
877 | { | |
878 | if (new || old) | |
7316ae88 | 879 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 880 | |
4d8863a2 | 881 | if (old) |
99194cff | 882 | qdisc_destroy(old); |
99194cff DM |
883 | } |
884 | ||
885 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
886 | * to device "dev". | |
887 | * | |
888 | * When appropriate send a netlink notification using 'skb' | |
889 | * and "n". | |
890 | * | |
891 | * On success, destroy old qdisc. | |
1da177e4 LT |
892 | */ |
893 | ||
894 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
895 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
896 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 897 | { |
99194cff | 898 | struct Qdisc *q = old; |
7316ae88 | 899 | struct net *net = dev_net(dev); |
1da177e4 | 900 | int err = 0; |
1da177e4 | 901 | |
10297b99 | 902 | if (parent == NULL) { |
99194cff DM |
903 | unsigned int i, num_q, ingress; |
904 | ||
905 | ingress = 0; | |
906 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
907 | if ((q && q->flags & TCQ_F_INGRESS) || |
908 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
909 | num_q = 1; |
910 | ingress = 1; | |
24824a09 ED |
911 | if (!dev_ingress_queue(dev)) |
912 | return -ENOENT; | |
99194cff DM |
913 | } |
914 | ||
915 | if (dev->flags & IFF_UP) | |
916 | dev_deactivate(dev); | |
917 | ||
86e363dc WC |
918 | if (new && new->ops->attach) |
919 | goto skip; | |
6ec1c69a | 920 | |
99194cff | 921 | for (i = 0; i < num_q; i++) { |
24824a09 | 922 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
923 | |
924 | if (!ingress) | |
925 | dev_queue = netdev_get_tx_queue(dev, i); | |
926 | ||
8d50b53d DM |
927 | old = dev_graft_qdisc(dev_queue, new); |
928 | if (new && i > 0) | |
7b936405 | 929 | refcount_inc(&new->refcnt); |
8d50b53d | 930 | |
036d6a67 JP |
931 | if (!ingress) |
932 | qdisc_destroy(old); | |
1da177e4 | 933 | } |
99194cff | 934 | |
86e363dc | 935 | skip: |
036d6a67 | 936 | if (!ingress) { |
7316ae88 TG |
937 | notify_and_destroy(net, skb, n, classid, |
938 | dev->qdisc, new); | |
036d6a67 | 939 | if (new && !new->ops->attach) |
7b936405 | 940 | refcount_inc(&new->refcnt); |
036d6a67 | 941 | dev->qdisc = new ? : &noop_qdisc; |
86e363dc WC |
942 | |
943 | if (new && new->ops->attach) | |
944 | new->ops->attach(new); | |
036d6a67 | 945 | } else { |
7316ae88 | 946 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 947 | } |
af356afa | 948 | |
99194cff DM |
949 | if (dev->flags & IFF_UP) |
950 | dev_activate(dev); | |
1da177e4 | 951 | } else { |
20fea08b | 952 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 953 | |
c9f1d038 PM |
954 | err = -EOPNOTSUPP; |
955 | if (cops && cops->graft) { | |
143976ce WC |
956 | unsigned long cl = cops->find(parent, classid); |
957 | ||
958 | if (cl) | |
99194cff | 959 | err = cops->graft(parent, cl, new, &old); |
143976ce | 960 | else |
c9f1d038 | 961 | err = -ENOENT; |
1da177e4 | 962 | } |
99194cff | 963 | if (!err) |
7316ae88 | 964 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
965 | } |
966 | return err; | |
967 | } | |
968 | ||
25bfcd5a JP |
969 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
970 | static struct lock_class_key qdisc_tx_lock; | |
971 | static struct lock_class_key qdisc_rx_lock; | |
972 | ||
1da177e4 LT |
973 | /* |
974 | Allocate and initialize new qdisc. | |
975 | ||
976 | Parameters are passed via opt. | |
977 | */ | |
978 | ||
5a7a5555 JHS |
979 | static struct Qdisc *qdisc_create(struct net_device *dev, |
980 | struct netdev_queue *dev_queue, | |
981 | struct Qdisc *p, u32 parent, u32 handle, | |
982 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
983 | { |
984 | int err; | |
1e90474c | 985 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
986 | struct Qdisc *sch; |
987 | struct Qdisc_ops *ops; | |
175f9c1b | 988 | struct qdisc_size_table *stab; |
1da177e4 LT |
989 | |
990 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 991 | #ifdef CONFIG_MODULES |
1da177e4 LT |
992 | if (ops == NULL && kind != NULL) { |
993 | char name[IFNAMSIZ]; | |
1e90474c | 994 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
995 | /* We dropped the RTNL semaphore in order to |
996 | * perform the module load. So, even if we | |
997 | * succeeded in loading the module we have to | |
998 | * tell the caller to replay the request. We | |
999 | * indicate this using -EAGAIN. | |
1000 | * We replay the request because the device may | |
1001 | * go away in the mean time. | |
1002 | */ | |
1003 | rtnl_unlock(); | |
1004 | request_module("sch_%s", name); | |
1005 | rtnl_lock(); | |
1006 | ops = qdisc_lookup_ops(kind); | |
1007 | if (ops != NULL) { | |
1008 | /* We will try again qdisc_lookup_ops, | |
1009 | * so don't keep a reference. | |
1010 | */ | |
1011 | module_put(ops->owner); | |
1012 | err = -EAGAIN; | |
1013 | goto err_out; | |
1014 | } | |
1015 | } | |
1016 | } | |
1017 | #endif | |
1018 | ||
b9e2cc0f | 1019 | err = -ENOENT; |
1da177e4 LT |
1020 | if (ops == NULL) |
1021 | goto err_out; | |
1022 | ||
5ce2d488 | 1023 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
1024 | if (IS_ERR(sch)) { |
1025 | err = PTR_ERR(sch); | |
1da177e4 | 1026 | goto err_out2; |
3d54b82f | 1027 | } |
1da177e4 | 1028 | |
ffc8fefa PM |
1029 | sch->parent = parent; |
1030 | ||
3d54b82f | 1031 | if (handle == TC_H_INGRESS) { |
1da177e4 | 1032 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 1033 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 1034 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 1035 | } else { |
fd44de7c PM |
1036 | if (handle == 0) { |
1037 | handle = qdisc_alloc_handle(dev); | |
1038 | err = -ENOMEM; | |
1039 | if (handle == 0) | |
1040 | goto err_out3; | |
1041 | } | |
25bfcd5a | 1042 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1abbe139 | 1043 | if (!netif_is_multiqueue(dev)) |
225734de | 1044 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
1045 | } |
1046 | ||
3d54b82f | 1047 | sch->handle = handle; |
1da177e4 | 1048 | |
84c46dd8 JDB |
1049 | /* This exist to keep backward compatible with a userspace |
1050 | * loophole, what allowed userspace to get IFF_NO_QUEUE | |
1051 | * facility on older kernels by setting tx_queue_len=0 (prior | |
1052 | * to qdisc init), and then forgot to reinit tx_queue_len | |
1053 | * before again attaching a qdisc. | |
1054 | */ | |
1055 | if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { | |
1056 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; | |
1057 | netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); | |
1058 | } | |
1059 | ||
1e90474c | 1060 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
22e0f8b9 JF |
1061 | if (qdisc_is_percpu_stats(sch)) { |
1062 | sch->cpu_bstats = | |
7c1c97d5 | 1063 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
22e0f8b9 JF |
1064 | if (!sch->cpu_bstats) |
1065 | goto err_out4; | |
b0ab6f92 JF |
1066 | |
1067 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
1068 | if (!sch->cpu_qstats) | |
1069 | goto err_out4; | |
22e0f8b9 JF |
1070 | } |
1071 | ||
175f9c1b JK |
1072 | if (tca[TCA_STAB]) { |
1073 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
1074 | if (IS_ERR(stab)) { | |
1075 | err = PTR_ERR(stab); | |
7c64b9f3 | 1076 | goto err_out4; |
175f9c1b | 1077 | } |
a2da570d | 1078 | rcu_assign_pointer(sch->stab, stab); |
175f9c1b | 1079 | } |
1e90474c | 1080 | if (tca[TCA_RATE]) { |
edb09eb1 | 1081 | seqcount_t *running; |
f6f9b93f | 1082 | |
23bcf634 PM |
1083 | err = -EOPNOTSUPP; |
1084 | if (sch->flags & TCQ_F_MQROOT) | |
1085 | goto err_out4; | |
1086 | ||
f6f9b93f | 1087 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
1088 | !(sch->flags & TCQ_F_INGRESS) && |
1089 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
edb09eb1 | 1090 | running = qdisc_root_sleeping_running(sch); |
f6f9b93f | 1091 | else |
edb09eb1 | 1092 | running = &sch->running; |
f6f9b93f | 1093 | |
22e0f8b9 JF |
1094 | err = gen_new_estimator(&sch->bstats, |
1095 | sch->cpu_bstats, | |
1096 | &sch->rate_est, | |
edb09eb1 ED |
1097 | NULL, |
1098 | running, | |
22e0f8b9 | 1099 | tca[TCA_RATE]); |
23bcf634 PM |
1100 | if (err) |
1101 | goto err_out4; | |
023e09a7 | 1102 | } |
f6e0b239 | 1103 | |
49b49971 | 1104 | qdisc_hash_add(sch, false); |
1da177e4 | 1105 | |
1da177e4 LT |
1106 | return sch; |
1107 | } | |
87b60cfa | 1108 | /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ |
c1a4872e GF |
1109 | if (ops->destroy) |
1110 | ops->destroy(sch); | |
1da177e4 LT |
1111 | err_out3: |
1112 | dev_put(dev); | |
3d54b82f | 1113 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
1114 | err_out2: |
1115 | module_put(ops->owner); | |
1116 | err_out: | |
1117 | *errp = err; | |
1da177e4 | 1118 | return NULL; |
23bcf634 PM |
1119 | |
1120 | err_out4: | |
22e0f8b9 | 1121 | free_percpu(sch->cpu_bstats); |
b0ab6f92 | 1122 | free_percpu(sch->cpu_qstats); |
23bcf634 PM |
1123 | /* |
1124 | * Any broken qdiscs that would require a ops->reset() here? | |
1125 | * The qdisc was never in action so it shouldn't be necessary. | |
1126 | */ | |
a2da570d | 1127 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1128 | if (ops->destroy) |
1129 | ops->destroy(sch); | |
1130 | goto err_out3; | |
1da177e4 LT |
1131 | } |
1132 | ||
1e90474c | 1133 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 1134 | { |
a2da570d | 1135 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1136 | int err = 0; |
1da177e4 | 1137 | |
175f9c1b | 1138 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
1139 | if (sch->ops->change == NULL) |
1140 | return -EINVAL; | |
1e90474c | 1141 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
1142 | if (err) |
1143 | return err; | |
1144 | } | |
175f9c1b JK |
1145 | |
1146 | if (tca[TCA_STAB]) { | |
1147 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
1148 | if (IS_ERR(stab)) | |
1149 | return PTR_ERR(stab); | |
1150 | } | |
1151 | ||
a2da570d ED |
1152 | ostab = rtnl_dereference(sch->stab); |
1153 | rcu_assign_pointer(sch->stab, stab); | |
1154 | qdisc_put_stab(ostab); | |
175f9c1b | 1155 | |
23bcf634 | 1156 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1157 | /* NB: ignores errors from replace_estimator |
1158 | because change can't be undone. */ | |
23bcf634 PM |
1159 | if (sch->flags & TCQ_F_MQROOT) |
1160 | goto out; | |
22e0f8b9 JF |
1161 | gen_replace_estimator(&sch->bstats, |
1162 | sch->cpu_bstats, | |
1163 | &sch->rate_est, | |
edb09eb1 ED |
1164 | NULL, |
1165 | qdisc_root_sleeping_running(sch), | |
22e0f8b9 | 1166 | tca[TCA_RATE]); |
23bcf634 PM |
1167 | } |
1168 | out: | |
1da177e4 LT |
1169 | return 0; |
1170 | } | |
1171 | ||
cc7ec456 ED |
1172 | struct check_loop_arg { |
1173 | struct qdisc_walker w; | |
1da177e4 LT |
1174 | struct Qdisc *p; |
1175 | int depth; | |
1176 | }; | |
1177 | ||
5a7a5555 JHS |
1178 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, |
1179 | struct qdisc_walker *w); | |
1da177e4 LT |
1180 | |
1181 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1182 | { | |
1183 | struct check_loop_arg arg; | |
1184 | ||
1185 | if (q->ops->cl_ops == NULL) | |
1186 | return 0; | |
1187 | ||
1188 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1189 | arg.w.fn = check_loop_fn; | |
1190 | arg.depth = depth; | |
1191 | arg.p = p; | |
1192 | q->ops->cl_ops->walk(q, &arg.w); | |
1193 | return arg.w.stop ? -ELOOP : 0; | |
1194 | } | |
1195 | ||
1196 | static int | |
1197 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1198 | { | |
1199 | struct Qdisc *leaf; | |
20fea08b | 1200 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1201 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1202 | ||
1203 | leaf = cops->leaf(q, cl); | |
1204 | if (leaf) { | |
1205 | if (leaf == arg->p || arg->depth > 7) | |
1206 | return -ELOOP; | |
1207 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1208 | } | |
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * Delete/get qdisc. | |
1214 | */ | |
1215 | ||
c21ef3e3 DA |
1216 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1217 | struct netlink_ext_ack *extack) | |
1da177e4 | 1218 | { |
3b1e0a65 | 1219 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1220 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1221 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1222 | struct net_device *dev; |
de179c8c | 1223 | u32 clid; |
1da177e4 LT |
1224 | struct Qdisc *q = NULL; |
1225 | struct Qdisc *p = NULL; | |
1226 | int err; | |
1227 | ||
4e8bbb81 | 1228 | if ((n->nlmsg_type != RTM_GETQDISC) && |
5f013c9b | 1229 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1230 | return -EPERM; |
1231 | ||
c21ef3e3 | 1232 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack); |
1e90474c PM |
1233 | if (err < 0) |
1234 | return err; | |
1235 | ||
de179c8c H |
1236 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1237 | if (!dev) | |
1238 | return -ENODEV; | |
1239 | ||
1240 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1241 | if (clid) { |
1242 | if (clid != TC_H_ROOT) { | |
1243 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 ED |
1244 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1245 | if (!p) | |
1da177e4 LT |
1246 | return -ENOENT; |
1247 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1248 | } else if (dev_ingress_queue(dev)) { |
1249 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1250 | } |
1da177e4 | 1251 | } else { |
af356afa | 1252 | q = dev->qdisc; |
1da177e4 LT |
1253 | } |
1254 | if (!q) | |
1255 | return -ENOENT; | |
1256 | ||
1257 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
1258 | return -EINVAL; | |
1259 | } else { | |
cc7ec456 ED |
1260 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1261 | if (!q) | |
1da177e4 LT |
1262 | return -ENOENT; |
1263 | } | |
1264 | ||
1e90474c | 1265 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1266 | return -EINVAL; |
1267 | ||
1268 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1269 | if (!clid) | |
1270 | return -EINVAL; | |
1271 | if (q->handle == 0) | |
1272 | return -ENOENT; | |
cc7ec456 ED |
1273 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
1274 | if (err != 0) | |
1da177e4 | 1275 | return err; |
1da177e4 | 1276 | } else { |
7316ae88 | 1277 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1278 | } |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | /* | |
cc7ec456 | 1283 | * Create/change qdisc. |
1da177e4 LT |
1284 | */ |
1285 | ||
c21ef3e3 DA |
1286 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1287 | struct netlink_ext_ack *extack) | |
1da177e4 | 1288 | { |
3b1e0a65 | 1289 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1290 | struct tcmsg *tcm; |
1e90474c | 1291 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1292 | struct net_device *dev; |
1293 | u32 clid; | |
1294 | struct Qdisc *q, *p; | |
1295 | int err; | |
1296 | ||
5f013c9b | 1297 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1298 | return -EPERM; |
1299 | ||
1da177e4 LT |
1300 | replay: |
1301 | /* Reinit, just in case something touches this. */ | |
c21ef3e3 | 1302 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack); |
de179c8c H |
1303 | if (err < 0) |
1304 | return err; | |
1305 | ||
02ef22ca | 1306 | tcm = nlmsg_data(n); |
1da177e4 LT |
1307 | clid = tcm->tcm_parent; |
1308 | q = p = NULL; | |
1309 | ||
cc7ec456 ED |
1310 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1311 | if (!dev) | |
1da177e4 LT |
1312 | return -ENODEV; |
1313 | ||
1e90474c | 1314 | |
1da177e4 LT |
1315 | if (clid) { |
1316 | if (clid != TC_H_ROOT) { | |
1317 | if (clid != TC_H_INGRESS) { | |
cc7ec456 ED |
1318 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1319 | if (!p) | |
1da177e4 LT |
1320 | return -ENOENT; |
1321 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1322 | } else if (dev_ingress_queue_create(dev)) { |
1323 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1324 | } |
1325 | } else { | |
af356afa | 1326 | q = dev->qdisc; |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | /* It may be default qdisc, ignore it */ | |
1330 | if (q && q->handle == 0) | |
1331 | q = NULL; | |
1332 | ||
1333 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1334 | if (tcm->tcm_handle) { | |
cc7ec456 | 1335 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
1da177e4 LT |
1336 | return -EEXIST; |
1337 | if (TC_H_MIN(tcm->tcm_handle)) | |
1338 | return -EINVAL; | |
cc7ec456 ED |
1339 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1340 | if (!q) | |
1da177e4 | 1341 | goto create_n_graft; |
cc7ec456 | 1342 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1343 | return -EEXIST; |
1e90474c | 1344 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1345 | return -EINVAL; |
1346 | if (q == p || | |
1347 | (p && check_loop(q, p, 0))) | |
1348 | return -ELOOP; | |
7b936405 | 1349 | refcount_inc(&q->refcnt); |
1da177e4 LT |
1350 | goto graft; |
1351 | } else { | |
cc7ec456 | 1352 | if (!q) |
1da177e4 LT |
1353 | goto create_n_graft; |
1354 | ||
1355 | /* This magic test requires explanation. | |
1356 | * | |
1357 | * We know, that some child q is already | |
1358 | * attached to this parent and have choice: | |
1359 | * either to change it or to create/graft new one. | |
1360 | * | |
1361 | * 1. We are allowed to create/graft only | |
1362 | * if CREATE and REPLACE flags are set. | |
1363 | * | |
1364 | * 2. If EXCL is set, requestor wanted to say, | |
1365 | * that qdisc tcm_handle is not expected | |
1366 | * to exist, so that we choose create/graft too. | |
1367 | * | |
1368 | * 3. The last case is when no flags are set. | |
1369 | * Alas, it is sort of hole in API, we | |
1370 | * cannot decide what to do unambiguously. | |
1371 | * For now we select create/graft, if | |
1372 | * user gave KIND, which does not match existing. | |
1373 | */ | |
cc7ec456 ED |
1374 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1375 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1376 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1377 | (tca[TCA_KIND] && |
1378 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1379 | goto create_n_graft; |
1380 | } | |
1381 | } | |
1382 | } else { | |
1383 | if (!tcm->tcm_handle) | |
1384 | return -EINVAL; | |
1385 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1386 | } | |
1387 | ||
1388 | /* Change qdisc parameters */ | |
1389 | if (q == NULL) | |
1390 | return -ENOENT; | |
cc7ec456 | 1391 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1392 | return -EEXIST; |
1e90474c | 1393 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1394 | return -EINVAL; |
1395 | err = qdisc_change(q, tca); | |
1396 | if (err == 0) | |
7316ae88 | 1397 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1398 | return err; |
1399 | ||
1400 | create_n_graft: | |
cc7ec456 | 1401 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
1da177e4 | 1402 | return -ENOENT; |
24824a09 ED |
1403 | if (clid == TC_H_INGRESS) { |
1404 | if (dev_ingress_queue(dev)) | |
1405 | q = qdisc_create(dev, dev_ingress_queue(dev), p, | |
1406 | tcm->tcm_parent, tcm->tcm_parent, | |
1407 | tca, &err); | |
1408 | else | |
1409 | err = -ENOENT; | |
1410 | } else { | |
926e61b7 | 1411 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1412 | |
1413 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1414 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1415 | else if (p) | |
1416 | dev_queue = p->dev_queue; | |
1417 | else | |
1418 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1419 | |
926e61b7 | 1420 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1421 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1422 | tca, &err); |
6ec1c69a | 1423 | } |
1da177e4 LT |
1424 | if (q == NULL) { |
1425 | if (err == -EAGAIN) | |
1426 | goto replay; | |
1427 | return err; | |
1428 | } | |
1429 | ||
1430 | graft: | |
e5befbd9 IJ |
1431 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1432 | if (err) { | |
1433 | if (q) | |
1434 | qdisc_destroy(q); | |
1435 | return err; | |
1da177e4 | 1436 | } |
e5befbd9 | 1437 | |
1da177e4 LT |
1438 | return 0; |
1439 | } | |
1440 | ||
30723673 DM |
1441 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1442 | struct netlink_callback *cb, | |
49b49971 JK |
1443 | int *q_idx_p, int s_q_idx, bool recur, |
1444 | bool dump_invisible) | |
30723673 DM |
1445 | { |
1446 | int ret = 0, q_idx = *q_idx_p; | |
1447 | struct Qdisc *q; | |
59cc1f61 | 1448 | int b; |
30723673 DM |
1449 | |
1450 | if (!root) | |
1451 | return 0; | |
1452 | ||
1453 | q = root; | |
1454 | if (q_idx < s_q_idx) { | |
1455 | q_idx++; | |
1456 | } else { | |
49b49971 | 1457 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1458 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1459 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1460 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1461 | goto done; |
1462 | q_idx++; | |
1463 | } | |
69012ae4 | 1464 | |
ea327469 JK |
1465 | /* If dumping singletons, there is no qdisc_dev(root) and the singleton |
1466 | * itself has already been dumped. | |
1467 | * | |
1468 | * If we've already dumped the top-level (ingress) qdisc above and the global | |
1469 | * qdisc hashtable, we don't want to hit it again | |
1470 | */ | |
1471 | if (!qdisc_dev(root) || !recur) | |
69012ae4 JK |
1472 | goto out; |
1473 | ||
59cc1f61 | 1474 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1475 | if (q_idx < s_q_idx) { |
1476 | q_idx++; | |
1477 | continue; | |
1478 | } | |
49b49971 | 1479 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1480 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1481 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1482 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1483 | goto done; |
1484 | q_idx++; | |
1485 | } | |
1486 | ||
1487 | out: | |
1488 | *q_idx_p = q_idx; | |
1489 | return ret; | |
1490 | done: | |
1491 | ret = -1; | |
1492 | goto out; | |
1493 | } | |
1494 | ||
1da177e4 LT |
1495 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1496 | { | |
3b1e0a65 | 1497 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1498 | int idx, q_idx; |
1499 | int s_idx, s_q_idx; | |
1500 | struct net_device *dev; | |
49b49971 JK |
1501 | const struct nlmsghdr *nlh = cb->nlh; |
1502 | struct tcmsg *tcm = nlmsg_data(nlh); | |
1503 | struct nlattr *tca[TCA_MAX + 1]; | |
1504 | int err; | |
1da177e4 LT |
1505 | |
1506 | s_idx = cb->args[0]; | |
1507 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1508 | |
7562f876 | 1509 | idx = 0; |
15dc36eb | 1510 | ASSERT_RTNL(); |
49b49971 | 1511 | |
fceb6435 | 1512 | err = nlmsg_parse(nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL); |
49b49971 JK |
1513 | if (err < 0) |
1514 | return err; | |
1515 | ||
15dc36eb | 1516 | for_each_netdev(net, dev) { |
30723673 DM |
1517 | struct netdev_queue *dev_queue; |
1518 | ||
1da177e4 | 1519 | if (idx < s_idx) |
7562f876 | 1520 | goto cont; |
1da177e4 LT |
1521 | if (idx > s_idx) |
1522 | s_q_idx = 0; | |
1da177e4 | 1523 | q_idx = 0; |
30723673 | 1524 | |
5a7a5555 | 1525 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx, |
49b49971 | 1526 | true, tca[TCA_DUMP_INVISIBLE]) < 0) |
30723673 DM |
1527 | goto done; |
1528 | ||
24824a09 ED |
1529 | dev_queue = dev_ingress_queue(dev); |
1530 | if (dev_queue && | |
1531 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
49b49971 JK |
1532 | &q_idx, s_q_idx, false, |
1533 | tca[TCA_DUMP_INVISIBLE]) < 0) | |
30723673 DM |
1534 | goto done; |
1535 | ||
7562f876 PE |
1536 | cont: |
1537 | idx++; | |
1da177e4 LT |
1538 | } |
1539 | ||
1540 | done: | |
1da177e4 LT |
1541 | cb->args[0] = idx; |
1542 | cb->args[1] = q_idx; | |
1543 | ||
1544 | return skb->len; | |
1545 | } | |
1546 | ||
1547 | ||
1548 | ||
1549 | /************************************************ | |
1550 | * Traffic classes manipulation. * | |
1551 | ************************************************/ | |
1552 | ||
27d7f07c WC |
1553 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, |
1554 | unsigned long cl, | |
1555 | u32 portid, u32 seq, u16 flags, int event) | |
1556 | { | |
1557 | struct tcmsg *tcm; | |
1558 | struct nlmsghdr *nlh; | |
1559 | unsigned char *b = skb_tail_pointer(skb); | |
1560 | struct gnet_dump d; | |
1561 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; | |
1da177e4 | 1562 | |
27d7f07c WC |
1563 | cond_resched(); |
1564 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1565 | if (!nlh) | |
1566 | goto out_nlmsg_trim; | |
1567 | tcm = nlmsg_data(nlh); | |
1568 | tcm->tcm_family = AF_UNSPEC; | |
1569 | tcm->tcm__pad1 = 0; | |
1570 | tcm->tcm__pad2 = 0; | |
1571 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1572 | tcm->tcm_parent = q->handle; | |
1573 | tcm->tcm_handle = q->handle; | |
1574 | tcm->tcm_info = 0; | |
1575 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
1576 | goto nla_put_failure; | |
1577 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) | |
1578 | goto nla_put_failure; | |
1579 | ||
1580 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
1581 | NULL, &d, TCA_PAD) < 0) | |
1582 | goto nla_put_failure; | |
1583 | ||
1584 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1585 | goto nla_put_failure; | |
1586 | ||
1587 | if (gnet_stats_finish_copy(&d) < 0) | |
1588 | goto nla_put_failure; | |
1589 | ||
1590 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1591 | return skb->len; | |
1592 | ||
1593 | out_nlmsg_trim: | |
1594 | nla_put_failure: | |
1595 | nlmsg_trim(skb, b); | |
1596 | return -1; | |
1597 | } | |
1598 | ||
1599 | static int tclass_notify(struct net *net, struct sk_buff *oskb, | |
1600 | struct nlmsghdr *n, struct Qdisc *q, | |
1601 | unsigned long cl, int event) | |
1602 | { | |
1603 | struct sk_buff *skb; | |
1604 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1605 | ||
1606 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1607 | if (!skb) | |
1608 | return -ENOBUFS; | |
1609 | ||
1610 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { | |
1611 | kfree_skb(skb); | |
1612 | return -EINVAL; | |
1613 | } | |
1614 | ||
1615 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1616 | n->nlmsg_flags & NLM_F_ECHO); | |
1617 | } | |
1da177e4 | 1618 | |
14546ba1 WC |
1619 | static int tclass_del_notify(struct net *net, |
1620 | const struct Qdisc_class_ops *cops, | |
1621 | struct sk_buff *oskb, struct nlmsghdr *n, | |
1622 | struct Qdisc *q, unsigned long cl) | |
1623 | { | |
1624 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1625 | struct sk_buff *skb; | |
1626 | int err = 0; | |
1627 | ||
1628 | if (!cops->delete) | |
1629 | return -EOPNOTSUPP; | |
1630 | ||
1631 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1632 | if (!skb) | |
1633 | return -ENOBUFS; | |
1634 | ||
1635 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, | |
1636 | RTM_DELTCLASS) < 0) { | |
1637 | kfree_skb(skb); | |
1638 | return -EINVAL; | |
1639 | } | |
1640 | ||
1641 | err = cops->delete(q, cl); | |
1642 | if (err) { | |
1643 | kfree_skb(skb); | |
1644 | return err; | |
1645 | } | |
1646 | ||
1647 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1648 | n->nlmsg_flags & NLM_F_ECHO); | |
1649 | } | |
1650 | ||
c21ef3e3 DA |
1651 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, |
1652 | struct netlink_ext_ack *extack) | |
1da177e4 | 1653 | { |
3b1e0a65 | 1654 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1655 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1656 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1657 | struct net_device *dev; |
1658 | struct Qdisc *q = NULL; | |
20fea08b | 1659 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1660 | unsigned long cl = 0; |
1661 | unsigned long new_cl; | |
de179c8c H |
1662 | u32 portid; |
1663 | u32 clid; | |
1664 | u32 qid; | |
1da177e4 LT |
1665 | int err; |
1666 | ||
4e8bbb81 | 1667 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
5f013c9b | 1668 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1669 | return -EPERM; |
1670 | ||
c21ef3e3 | 1671 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack); |
1e90474c PM |
1672 | if (err < 0) |
1673 | return err; | |
1674 | ||
de179c8c H |
1675 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1676 | if (!dev) | |
1677 | return -ENODEV; | |
1678 | ||
1da177e4 LT |
1679 | /* |
1680 | parent == TC_H_UNSPEC - unspecified parent. | |
1681 | parent == TC_H_ROOT - class is root, which has no parent. | |
1682 | parent == X:0 - parent is root class. | |
1683 | parent == X:Y - parent is a node in hierarchy. | |
1684 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1685 | ||
1686 | handle == 0:0 - generate handle from kernel pool. | |
1687 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1688 | handle == X:Y - clear. | |
1689 | handle == X:0 - root class. | |
1690 | */ | |
1691 | ||
1692 | /* Step 1. Determine qdisc handle X:0 */ | |
1693 | ||
de179c8c H |
1694 | portid = tcm->tcm_parent; |
1695 | clid = tcm->tcm_handle; | |
1696 | qid = TC_H_MAJ(clid); | |
1697 | ||
15e47304 EB |
1698 | if (portid != TC_H_ROOT) { |
1699 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
1700 | |
1701 | if (qid && qid1) { | |
1702 | /* If both majors are known, they must be identical. */ | |
1703 | if (qid != qid1) | |
1704 | return -EINVAL; | |
1705 | } else if (qid1) { | |
1706 | qid = qid1; | |
1707 | } else if (qid == 0) | |
af356afa | 1708 | qid = dev->qdisc->handle; |
1da177e4 LT |
1709 | |
1710 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1711 | * both with parent and child. |
1712 | * | |
15e47304 | 1713 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 1714 | */ |
15e47304 EB |
1715 | if (portid) |
1716 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
1717 | } else { |
1718 | if (qid == 0) | |
af356afa | 1719 | qid = dev->qdisc->handle; |
1da177e4 LT |
1720 | } |
1721 | ||
1722 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1723 | q = qdisc_lookup(dev, qid); |
1724 | if (!q) | |
1da177e4 LT |
1725 | return -ENOENT; |
1726 | ||
1727 | /* An check that it supports classes */ | |
1728 | cops = q->ops->cl_ops; | |
1729 | if (cops == NULL) | |
1730 | return -EINVAL; | |
1731 | ||
1732 | /* Now try to get class */ | |
1733 | if (clid == 0) { | |
15e47304 | 1734 | if (portid == TC_H_ROOT) |
1da177e4 LT |
1735 | clid = qid; |
1736 | } else | |
1737 | clid = TC_H_MAKE(qid, clid); | |
1738 | ||
1739 | if (clid) | |
143976ce | 1740 | cl = cops->find(q, clid); |
1da177e4 LT |
1741 | |
1742 | if (cl == 0) { | |
1743 | err = -ENOENT; | |
cc7ec456 ED |
1744 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1745 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1746 | goto out; |
1747 | } else { | |
1748 | switch (n->nlmsg_type) { | |
10297b99 | 1749 | case RTM_NEWTCLASS: |
1da177e4 | 1750 | err = -EEXIST; |
cc7ec456 | 1751 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1752 | goto out; |
1753 | break; | |
1754 | case RTM_DELTCLASS: | |
14546ba1 | 1755 | err = tclass_del_notify(net, cops, skb, n, q, cl); |
1da177e4 LT |
1756 | goto out; |
1757 | case RTM_GETTCLASS: | |
7316ae88 | 1758 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1759 | goto out; |
1760 | default: | |
1761 | err = -EINVAL; | |
1762 | goto out; | |
1763 | } | |
1764 | } | |
1765 | ||
1766 | new_cl = cl; | |
de6d5cdf PM |
1767 | err = -EOPNOTSUPP; |
1768 | if (cops->change) | |
15e47304 | 1769 | err = cops->change(q, clid, portid, tca, &new_cl); |
1da177e4 | 1770 | if (err == 0) |
7316ae88 | 1771 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1772 | |
1773 | out: | |
1da177e4 LT |
1774 | return err; |
1775 | } | |
1776 | ||
cc7ec456 ED |
1777 | struct qdisc_dump_args { |
1778 | struct qdisc_walker w; | |
1779 | struct sk_buff *skb; | |
1780 | struct netlink_callback *cb; | |
1da177e4 LT |
1781 | }; |
1782 | ||
5a7a5555 JHS |
1783 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, |
1784 | struct qdisc_walker *arg) | |
1da177e4 LT |
1785 | { |
1786 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1787 | ||
15e47304 | 1788 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
1789 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1790 | RTM_NEWTCLASS); | |
1da177e4 LT |
1791 | } |
1792 | ||
30723673 DM |
1793 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1794 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1795 | int *t_p, int s_t) | |
1796 | { | |
1797 | struct qdisc_dump_args arg; | |
1798 | ||
49b49971 | 1799 | if (tc_qdisc_dump_ignore(q, false) || |
30723673 DM |
1800 | *t_p < s_t || !q->ops->cl_ops || |
1801 | (tcm->tcm_parent && | |
1802 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1803 | (*t_p)++; | |
1804 | return 0; | |
1805 | } | |
1806 | if (*t_p > s_t) | |
1807 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1808 | arg.w.fn = qdisc_class_dump; | |
1809 | arg.skb = skb; | |
1810 | arg.cb = cb; | |
1811 | arg.w.stop = 0; | |
1812 | arg.w.skip = cb->args[1]; | |
1813 | arg.w.count = 0; | |
1814 | q->ops->cl_ops->walk(q, &arg.w); | |
1815 | cb->args[1] = arg.w.count; | |
1816 | if (arg.w.stop) | |
1817 | return -1; | |
1818 | (*t_p)++; | |
1819 | return 0; | |
1820 | } | |
1821 | ||
1822 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1823 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1824 | int *t_p, int s_t) | |
1825 | { | |
1826 | struct Qdisc *q; | |
59cc1f61 | 1827 | int b; |
30723673 DM |
1828 | |
1829 | if (!root) | |
1830 | return 0; | |
1831 | ||
1832 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1833 | return -1; | |
1834 | ||
69012ae4 JK |
1835 | if (!qdisc_dev(root)) |
1836 | return 0; | |
1837 | ||
cb395b20 ED |
1838 | if (tcm->tcm_parent) { |
1839 | q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent)); | |
1840 | if (q && tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1841 | return -1; | |
1842 | return 0; | |
1843 | } | |
59cc1f61 | 1844 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1845 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
1846 | return -1; | |
1847 | } | |
1848 | ||
1849 | return 0; | |
1850 | } | |
1851 | ||
1da177e4 LT |
1852 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1853 | { | |
02ef22ca | 1854 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 1855 | struct net *net = sock_net(skb->sk); |
30723673 | 1856 | struct netdev_queue *dev_queue; |
1da177e4 | 1857 | struct net_device *dev; |
30723673 | 1858 | int t, s_t; |
1da177e4 | 1859 | |
573ce260 | 1860 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1861 | return 0; |
cc7ec456 ED |
1862 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
1863 | if (!dev) | |
1da177e4 LT |
1864 | return 0; |
1865 | ||
1866 | s_t = cb->args[0]; | |
1867 | t = 0; | |
1868 | ||
af356afa | 1869 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1870 | goto done; |
1871 | ||
24824a09 ED |
1872 | dev_queue = dev_ingress_queue(dev); |
1873 | if (dev_queue && | |
1874 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
1875 | &t, s_t) < 0) | |
30723673 | 1876 | goto done; |
1da177e4 | 1877 | |
30723673 | 1878 | done: |
1da177e4 LT |
1879 | cb->args[0] = t; |
1880 | ||
1881 | dev_put(dev); | |
1882 | return skb->len; | |
1883 | } | |
1884 | ||
1da177e4 LT |
1885 | #ifdef CONFIG_PROC_FS |
1886 | static int psched_show(struct seq_file *seq, void *v) | |
1887 | { | |
1888 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 1889 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1890 | 1000000, |
1e317688 | 1891 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
1892 | |
1893 | return 0; | |
1894 | } | |
1895 | ||
1896 | static int psched_open(struct inode *inode, struct file *file) | |
1897 | { | |
7e5ab157 | 1898 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1899 | } |
1900 | ||
da7071d7 | 1901 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1902 | .owner = THIS_MODULE, |
1903 | .open = psched_open, | |
1904 | .read = seq_read, | |
1905 | .llseek = seq_lseek, | |
1906 | .release = single_release, | |
10297b99 | 1907 | }; |
7316ae88 TG |
1908 | |
1909 | static int __net_init psched_net_init(struct net *net) | |
1910 | { | |
1911 | struct proc_dir_entry *e; | |
1912 | ||
d4beaa66 | 1913 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
7316ae88 TG |
1914 | if (e == NULL) |
1915 | return -ENOMEM; | |
1916 | ||
1917 | return 0; | |
1918 | } | |
1919 | ||
1920 | static void __net_exit psched_net_exit(struct net *net) | |
1921 | { | |
ece31ffd | 1922 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
1923 | } |
1924 | #else | |
1925 | static int __net_init psched_net_init(struct net *net) | |
1926 | { | |
1927 | return 0; | |
1928 | } | |
1929 | ||
1930 | static void __net_exit psched_net_exit(struct net *net) | |
1931 | { | |
1932 | } | |
1da177e4 LT |
1933 | #endif |
1934 | ||
7316ae88 TG |
1935 | static struct pernet_operations psched_net_ops = { |
1936 | .init = psched_net_init, | |
1937 | .exit = psched_net_exit, | |
1938 | }; | |
1939 | ||
1da177e4 LT |
1940 | static int __init pktsched_init(void) |
1941 | { | |
7316ae88 TG |
1942 | int err; |
1943 | ||
1944 | err = register_pernet_subsys(&psched_net_ops); | |
1945 | if (err) { | |
cc7ec456 | 1946 | pr_err("pktsched_init: " |
7316ae88 TG |
1947 | "cannot initialize per netns operations\n"); |
1948 | return err; | |
1949 | } | |
1950 | ||
6da7c8fc | 1951 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
1952 | register_qdisc(&pfifo_qdisc_ops); |
1953 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1954 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1955 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 1956 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 1957 | |
b97bac64 FW |
1958 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0); |
1959 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0); | |
5a7a5555 | 1960 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, |
b97bac64 FW |
1961 | 0); |
1962 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0); | |
1963 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0); | |
5a7a5555 | 1964 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, |
b97bac64 | 1965 | 0); |
be577ddc | 1966 | |
1da177e4 LT |
1967 | return 0; |
1968 | } | |
1969 | ||
1970 | subsys_initcall(pktsched_init); |