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 | 37 | #include <net/pkt_sched.h> |
07d79fc7 | 38 | #include <net/pkt_cls.h> |
1da177e4 | 39 | |
1da177e4 LT |
40 | /* |
41 | ||
42 | Short review. | |
43 | ------------- | |
44 | ||
45 | This file consists of two interrelated parts: | |
46 | ||
47 | 1. queueing disciplines manager frontend. | |
48 | 2. traffic classes manager frontend. | |
49 | ||
50 | Generally, queueing discipline ("qdisc") is a black box, | |
51 | which is able to enqueue packets and to dequeue them (when | |
52 | device is ready to send something) in order and at times | |
53 | determined by algorithm hidden in it. | |
54 | ||
55 | qdisc's are divided to two categories: | |
56 | - "queues", which have no internal structure visible from outside. | |
57 | - "schedulers", which split all the packets to "traffic classes", | |
58 | using "packet classifiers" (look at cls_api.c) | |
59 | ||
60 | In turn, classes may have child qdiscs (as rule, queues) | |
61 | attached to them etc. etc. etc. | |
62 | ||
63 | The goal of the routines in this file is to translate | |
64 | information supplied by user in the form of handles | |
65 | to more intelligible for kernel form, to make some sanity | |
66 | checks and part of work, which is common to all qdiscs | |
67 | and to provide rtnetlink notifications. | |
68 | ||
69 | All real intelligent work is done inside qdisc modules. | |
70 | ||
71 | ||
72 | ||
73 | Every discipline has two major routines: enqueue and dequeue. | |
74 | ||
75 | ---dequeue | |
76 | ||
77 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
78 | but it does not mean that queue is empty, it just means that | |
79 | discipline does not want to send anything this time. | |
80 | Queue is really empty if q->q.qlen == 0. | |
81 | For complicated disciplines with multiple queues q->q is not | |
82 | real packet queue, but however q->q.qlen must be valid. | |
83 | ||
84 | ---enqueue | |
85 | ||
86 | enqueue returns 0, if packet was enqueued successfully. | |
87 | If packet (this one or another one) was dropped, it returns | |
88 | not zero error code. | |
89 | NET_XMIT_DROP - this packet dropped | |
90 | Expected action: do not backoff, but wait until queue will clear. | |
91 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
92 | Expected action: backoff or ignore | |
1da177e4 LT |
93 | |
94 | Auxiliary routines: | |
95 | ||
99c0db26 JP |
96 | ---peek |
97 | ||
98 | like dequeue but without removing a packet from the queue | |
99 | ||
1da177e4 LT |
100 | ---reset |
101 | ||
102 | returns qdisc to initial state: purge all buffers, clear all | |
103 | timers, counters (except for statistics) etc. | |
104 | ||
105 | ---init | |
106 | ||
107 | initializes newly created qdisc. | |
108 | ||
109 | ---destroy | |
110 | ||
111 | destroys resources allocated by init and during lifetime of qdisc. | |
112 | ||
113 | ---change | |
114 | ||
115 | changes qdisc parameters. | |
116 | */ | |
117 | ||
118 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
119 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
120 | ||
121 | ||
122 | /************************************************ | |
123 | * Queueing disciplines manipulation. * | |
124 | ************************************************/ | |
125 | ||
126 | ||
127 | /* The list of all installed queueing disciplines. */ | |
128 | ||
129 | static struct Qdisc_ops *qdisc_base; | |
130 | ||
21eb2189 | 131 | /* Register/unregister queueing discipline */ |
1da177e4 LT |
132 | |
133 | int register_qdisc(struct Qdisc_ops *qops) | |
134 | { | |
135 | struct Qdisc_ops *q, **qp; | |
136 | int rc = -EEXIST; | |
137 | ||
138 | write_lock(&qdisc_mod_lock); | |
139 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
140 | if (!strcmp(qops->id, q->id)) | |
141 | goto out; | |
142 | ||
143 | if (qops->enqueue == NULL) | |
144 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 | 145 | if (qops->peek == NULL) { |
68fd26b5 | 146 | if (qops->dequeue == NULL) |
99c0db26 | 147 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
148 | else |
149 | goto out_einval; | |
99c0db26 | 150 | } |
1da177e4 LT |
151 | if (qops->dequeue == NULL) |
152 | qops->dequeue = noop_qdisc_ops.dequeue; | |
153 | ||
68fd26b5 JP |
154 | if (qops->cl_ops) { |
155 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
156 | ||
143976ce | 157 | if (!(cops->find && cops->walk && cops->leaf)) |
68fd26b5 JP |
158 | goto out_einval; |
159 | ||
6529eaba | 160 | if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf)) |
68fd26b5 JP |
161 | goto out_einval; |
162 | } | |
163 | ||
1da177e4 LT |
164 | qops->next = NULL; |
165 | *qp = qops; | |
166 | rc = 0; | |
167 | out: | |
168 | write_unlock(&qdisc_mod_lock); | |
169 | return rc; | |
68fd26b5 JP |
170 | |
171 | out_einval: | |
172 | rc = -EINVAL; | |
173 | goto out; | |
1da177e4 | 174 | } |
62e3ba1b | 175 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
176 | |
177 | int unregister_qdisc(struct Qdisc_ops *qops) | |
178 | { | |
179 | struct Qdisc_ops *q, **qp; | |
180 | int err = -ENOENT; | |
181 | ||
182 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 183 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
184 | if (q == qops) |
185 | break; | |
186 | if (q) { | |
187 | *qp = q->next; | |
188 | q->next = NULL; | |
189 | err = 0; | |
190 | } | |
191 | write_unlock(&qdisc_mod_lock); | |
192 | return err; | |
193 | } | |
62e3ba1b | 194 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 | 195 | |
6da7c8fc | 196 | /* Get default qdisc if not otherwise specified */ |
197 | void qdisc_get_default(char *name, size_t len) | |
198 | { | |
199 | read_lock(&qdisc_mod_lock); | |
200 | strlcpy(name, default_qdisc_ops->id, len); | |
201 | read_unlock(&qdisc_mod_lock); | |
202 | } | |
203 | ||
204 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) | |
205 | { | |
206 | struct Qdisc_ops *q = NULL; | |
207 | ||
208 | for (q = qdisc_base; q; q = q->next) { | |
209 | if (!strcmp(name, q->id)) { | |
210 | if (!try_module_get(q->owner)) | |
211 | q = NULL; | |
212 | break; | |
213 | } | |
214 | } | |
215 | ||
216 | return q; | |
217 | } | |
218 | ||
219 | /* Set new default qdisc to use */ | |
220 | int qdisc_set_default(const char *name) | |
221 | { | |
222 | const struct Qdisc_ops *ops; | |
223 | ||
224 | if (!capable(CAP_NET_ADMIN)) | |
225 | return -EPERM; | |
226 | ||
227 | write_lock(&qdisc_mod_lock); | |
228 | ops = qdisc_lookup_default(name); | |
229 | if (!ops) { | |
230 | /* Not found, drop lock and try to load module */ | |
231 | write_unlock(&qdisc_mod_lock); | |
232 | request_module("sch_%s", name); | |
233 | write_lock(&qdisc_mod_lock); | |
234 | ||
235 | ops = qdisc_lookup_default(name); | |
236 | } | |
237 | ||
238 | if (ops) { | |
239 | /* Set new default */ | |
240 | module_put(default_qdisc_ops->owner); | |
241 | default_qdisc_ops = ops; | |
242 | } | |
243 | write_unlock(&qdisc_mod_lock); | |
244 | ||
245 | return ops ? 0 : -ENOENT; | |
246 | } | |
247 | ||
8ea3e439 | 248 | #ifdef CONFIG_NET_SCH_DEFAULT |
249 | /* Set default value from kernel config */ | |
250 | static int __init sch_default_qdisc(void) | |
251 | { | |
252 | return qdisc_set_default(CONFIG_DEFAULT_NET_SCH); | |
253 | } | |
254 | late_initcall(sch_default_qdisc); | |
255 | #endif | |
256 | ||
1da177e4 | 257 | /* We know handle. Find qdisc among all qdisc's attached to device |
4eaf3b84 ED |
258 | * (root qdisc, all its children, children of children etc.) |
259 | * Note: caller either uses rtnl or rcu_read_lock() | |
1da177e4 LT |
260 | */ |
261 | ||
6113b748 | 262 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
263 | { |
264 | struct Qdisc *q; | |
265 | ||
69012ae4 JK |
266 | if (!qdisc_dev(root)) |
267 | return (root->handle == handle ? root : NULL); | |
268 | ||
8123b421 DM |
269 | if (!(root->flags & TCQ_F_BUILTIN) && |
270 | root->handle == handle) | |
271 | return root; | |
272 | ||
59cc1f61 | 273 | hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) { |
8123b421 DM |
274 | if (q->handle == handle) |
275 | return q; | |
276 | } | |
277 | return NULL; | |
278 | } | |
279 | ||
49b49971 | 280 | void qdisc_hash_add(struct Qdisc *q, bool invisible) |
f6e0b239 | 281 | { |
37314363 | 282 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
4eaf3b84 | 283 | ASSERT_RTNL(); |
59cc1f61 | 284 | hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle); |
49b49971 JK |
285 | if (invisible) |
286 | q->flags |= TCQ_F_INVISIBLE; | |
37314363 | 287 | } |
f6e0b239 | 288 | } |
59cc1f61 | 289 | EXPORT_SYMBOL(qdisc_hash_add); |
f6e0b239 | 290 | |
59cc1f61 | 291 | void qdisc_hash_del(struct Qdisc *q) |
f6e0b239 | 292 | { |
4eaf3b84 ED |
293 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
294 | ASSERT_RTNL(); | |
59cc1f61 | 295 | hash_del_rcu(&q->hash); |
4eaf3b84 | 296 | } |
f6e0b239 | 297 | } |
59cc1f61 | 298 | EXPORT_SYMBOL(qdisc_hash_del); |
f6e0b239 | 299 | |
ead81cc5 | 300 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 301 | { |
f6e0b239 JP |
302 | struct Qdisc *q; |
303 | ||
50317fce CW |
304 | if (!handle) |
305 | return NULL; | |
af356afa PM |
306 | q = qdisc_match_from_root(dev->qdisc, handle); |
307 | if (q) | |
308 | goto out; | |
f6e0b239 | 309 | |
24824a09 ED |
310 | if (dev_ingress_queue(dev)) |
311 | q = qdisc_match_from_root( | |
312 | dev_ingress_queue(dev)->qdisc_sleeping, | |
313 | handle); | |
f6486d40 | 314 | out: |
f6e0b239 | 315 | return q; |
1da177e4 LT |
316 | } |
317 | ||
318 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
319 | { | |
320 | unsigned long cl; | |
321 | struct Qdisc *leaf; | |
20fea08b | 322 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
323 | |
324 | if (cops == NULL) | |
325 | return NULL; | |
143976ce | 326 | cl = cops->find(p, classid); |
1da177e4 LT |
327 | |
328 | if (cl == 0) | |
329 | return NULL; | |
330 | leaf = cops->leaf(p, cl); | |
1da177e4 LT |
331 | return leaf; |
332 | } | |
333 | ||
334 | /* Find queueing discipline by name */ | |
335 | ||
1e90474c | 336 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
337 | { |
338 | struct Qdisc_ops *q = NULL; | |
339 | ||
340 | if (kind) { | |
341 | read_lock(&qdisc_mod_lock); | |
342 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 343 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
344 | if (!try_module_get(q->owner)) |
345 | q = NULL; | |
346 | break; | |
347 | } | |
348 | } | |
349 | read_unlock(&qdisc_mod_lock); | |
350 | } | |
351 | return q; | |
352 | } | |
353 | ||
8a8e3d84 JDB |
354 | /* The linklayer setting were not transferred from iproute2, in older |
355 | * versions, and the rate tables lookup systems have been dropped in | |
356 | * the kernel. To keep backward compatible with older iproute2 tc | |
357 | * utils, we detect the linklayer setting by detecting if the rate | |
358 | * table were modified. | |
359 | * | |
360 | * For linklayer ATM table entries, the rate table will be aligned to | |
361 | * 48 bytes, thus some table entries will contain the same value. The | |
362 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
363 | * starting from the mpu, we find low and high table entries for | |
364 | * mapping this cell. If these entries contain the same value, when | |
365 | * the rate tables have been modified for linklayer ATM. | |
366 | * | |
367 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
368 | * and then roundup to the next cell, calc the table entry one below, | |
369 | * and compare. | |
370 | */ | |
371 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
372 | { | |
373 | int low = roundup(r->mpu, 48); | |
374 | int high = roundup(low+1, 48); | |
375 | int cell_low = low >> r->cell_log; | |
376 | int cell_high = (high >> r->cell_log) - 1; | |
377 | ||
378 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
379 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
380 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
381 | return TC_LINKLAYER_ETHERNET; | |
382 | } | |
383 | ||
384 | if ((cell_high > cell_low) && (cell_high < 256) | |
385 | && (rtab[cell_low] == rtab[cell_high])) { | |
386 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
387 | cell_low, cell_high, rtab[cell_high]); | |
388 | return TC_LINKLAYER_ATM; | |
389 | } | |
390 | return TC_LINKLAYER_ETHERNET; | |
391 | } | |
392 | ||
1da177e4 LT |
393 | static struct qdisc_rate_table *qdisc_rtab_list; |
394 | ||
5a7a5555 | 395 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
e9bc3fa2 AA |
396 | struct nlattr *tab, |
397 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
398 | { |
399 | struct qdisc_rate_table *rtab; | |
400 | ||
40edeff6 | 401 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
e9bc3fa2 AA |
402 | nla_len(tab) != TC_RTAB_SIZE) { |
403 | NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching"); | |
40edeff6 | 404 | return NULL; |
e9bc3fa2 | 405 | } |
40edeff6 | 406 | |
1da177e4 | 407 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
408 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
409 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
410 | rtab->refcnt++; |
411 | return rtab; | |
412 | } | |
413 | } | |
414 | ||
1da177e4 LT |
415 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
416 | if (rtab) { | |
417 | rtab->rate = *r; | |
418 | rtab->refcnt = 1; | |
1e90474c | 419 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
420 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
421 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
422 | rtab->next = qdisc_rtab_list; |
423 | qdisc_rtab_list = rtab; | |
e9bc3fa2 AA |
424 | } else { |
425 | NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table"); | |
1da177e4 LT |
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 | ||
09215598 AA |
457 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt, |
458 | struct netlink_ext_ack *extack) | |
175f9c1b JK |
459 | { |
460 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
461 | struct qdisc_size_table *stab; | |
462 | struct tc_sizespec *s; | |
463 | unsigned int tsize = 0; | |
464 | u16 *tab = NULL; | |
465 | int err; | |
466 | ||
09215598 | 467 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, extack); |
175f9c1b JK |
468 | if (err < 0) |
469 | return ERR_PTR(err); | |
09215598 AA |
470 | if (!tb[TCA_STAB_BASE]) { |
471 | NL_SET_ERR_MSG(extack, "Size table base attribute is missing"); | |
175f9c1b | 472 | return ERR_PTR(-EINVAL); |
09215598 | 473 | } |
175f9c1b JK |
474 | |
475 | s = nla_data(tb[TCA_STAB_BASE]); | |
476 | ||
477 | if (s->tsize > 0) { | |
09215598 AA |
478 | if (!tb[TCA_STAB_DATA]) { |
479 | NL_SET_ERR_MSG(extack, "Size table data attribute is missing"); | |
175f9c1b | 480 | return ERR_PTR(-EINVAL); |
09215598 | 481 | } |
175f9c1b JK |
482 | tab = nla_data(tb[TCA_STAB_DATA]); |
483 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
484 | } | |
485 | ||
09215598 AA |
486 | if (tsize != s->tsize || (!tab && tsize > 0)) { |
487 | NL_SET_ERR_MSG(extack, "Invalid size of size table"); | |
175f9c1b | 488 | return ERR_PTR(-EINVAL); |
09215598 | 489 | } |
175f9c1b | 490 | |
175f9c1b JK |
491 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
492 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
493 | continue; | |
494 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
495 | continue; | |
496 | stab->refcnt++; | |
175f9c1b JK |
497 | return stab; |
498 | } | |
499 | ||
175f9c1b JK |
500 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); |
501 | if (!stab) | |
502 | return ERR_PTR(-ENOMEM); | |
503 | ||
504 | stab->refcnt = 1; | |
505 | stab->szopts = *s; | |
506 | if (tsize > 0) | |
507 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
508 | ||
175f9c1b | 509 | list_add_tail(&stab->list, &qdisc_stab_list); |
175f9c1b JK |
510 | |
511 | return stab; | |
512 | } | |
513 | ||
a2da570d ED |
514 | static void stab_kfree_rcu(struct rcu_head *head) |
515 | { | |
516 | kfree(container_of(head, struct qdisc_size_table, rcu)); | |
517 | } | |
518 | ||
175f9c1b JK |
519 | void qdisc_put_stab(struct qdisc_size_table *tab) |
520 | { | |
521 | if (!tab) | |
522 | return; | |
523 | ||
175f9c1b JK |
524 | if (--tab->refcnt == 0) { |
525 | list_del(&tab->list); | |
a2da570d | 526 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
175f9c1b | 527 | } |
175f9c1b JK |
528 | } |
529 | EXPORT_SYMBOL(qdisc_put_stab); | |
530 | ||
531 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
532 | { | |
533 | struct nlattr *nest; | |
534 | ||
535 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
536 | if (nest == NULL) |
537 | goto nla_put_failure; | |
1b34ec43 DM |
538 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
539 | goto nla_put_failure; | |
175f9c1b JK |
540 | nla_nest_end(skb, nest); |
541 | ||
542 | return skb->len; | |
543 | ||
544 | nla_put_failure: | |
545 | return -1; | |
546 | } | |
547 | ||
5a7a5555 JHS |
548 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
549 | const struct qdisc_size_table *stab) | |
175f9c1b JK |
550 | { |
551 | int pkt_len, slot; | |
552 | ||
553 | pkt_len = skb->len + stab->szopts.overhead; | |
554 | if (unlikely(!stab->szopts.tsize)) | |
555 | goto out; | |
556 | ||
557 | slot = pkt_len + stab->szopts.cell_align; | |
558 | if (unlikely(slot < 0)) | |
559 | slot = 0; | |
560 | ||
561 | slot >>= stab->szopts.cell_log; | |
562 | if (likely(slot < stab->szopts.tsize)) | |
563 | pkt_len = stab->data[slot]; | |
564 | else | |
565 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
566 | (slot / stab->szopts.tsize) + | |
567 | stab->data[slot % stab->szopts.tsize]; | |
568 | ||
569 | pkt_len <<= stab->szopts.size_log; | |
570 | out: | |
571 | if (unlikely(pkt_len < 1)) | |
572 | pkt_len = 1; | |
573 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
574 | } | |
a2da570d | 575 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 576 | |
6e765a00 | 577 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
578 | { |
579 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
580 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
581 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
582 | qdisc->flags |= TCQ_F_WARN_NONWC; |
583 | } | |
584 | } | |
585 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
586 | ||
4179477f PM |
587 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
588 | { | |
589 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 590 | timer); |
4179477f | 591 | |
1e203c1a | 592 | rcu_read_lock(); |
8608db03 | 593 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 594 | rcu_read_unlock(); |
1936502d | 595 | |
4179477f PM |
596 | return HRTIMER_NORESTART; |
597 | } | |
598 | ||
599 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
600 | { | |
4a8e320c | 601 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 602 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
603 | wd->qdisc = qdisc; |
604 | } | |
605 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
606 | ||
45f50bed | 607 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires) |
4179477f | 608 | { |
2540e051 JP |
609 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
610 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
611 | return; | |
612 | ||
a9efad8b ED |
613 | if (wd->last_expires == expires) |
614 | return; | |
615 | ||
616 | wd->last_expires = expires; | |
46baac38 | 617 | hrtimer_start(&wd->timer, |
34c5d292 | 618 | ns_to_ktime(expires), |
4a8e320c | 619 | HRTIMER_MODE_ABS_PINNED); |
4179477f | 620 | } |
34c5d292 | 621 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
4179477f PM |
622 | |
623 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
624 | { | |
2fbd3da3 | 625 | hrtimer_cancel(&wd->timer); |
4179477f PM |
626 | } |
627 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 628 | |
a94f779f | 629 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 | 630 | { |
6fe1c7a5 | 631 | struct hlist_head *h; |
9695fe6f | 632 | unsigned int i; |
6fe1c7a5 | 633 | |
9695fe6f | 634 | h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL); |
6fe1c7a5 PM |
635 | |
636 | if (h != NULL) { | |
637 | for (i = 0; i < n; i++) | |
638 | INIT_HLIST_HEAD(&h[i]); | |
639 | } | |
640 | return h; | |
641 | } | |
642 | ||
6fe1c7a5 PM |
643 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) |
644 | { | |
645 | struct Qdisc_class_common *cl; | |
b67bfe0d | 646 | struct hlist_node *next; |
6fe1c7a5 PM |
647 | struct hlist_head *nhash, *ohash; |
648 | unsigned int nsize, nmask, osize; | |
649 | unsigned int i, h; | |
650 | ||
651 | /* Rehash when load factor exceeds 0.75 */ | |
652 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
653 | return; | |
654 | nsize = clhash->hashsize * 2; | |
655 | nmask = nsize - 1; | |
656 | nhash = qdisc_class_hash_alloc(nsize); | |
657 | if (nhash == NULL) | |
658 | return; | |
659 | ||
660 | ohash = clhash->hash; | |
661 | osize = clhash->hashsize; | |
662 | ||
663 | sch_tree_lock(sch); | |
664 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 665 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
666 | h = qdisc_class_hash(cl->classid, nmask); |
667 | hlist_add_head(&cl->hnode, &nhash[h]); | |
668 | } | |
669 | } | |
670 | clhash->hash = nhash; | |
671 | clhash->hashsize = nsize; | |
672 | clhash->hashmask = nmask; | |
673 | sch_tree_unlock(sch); | |
674 | ||
9695fe6f | 675 | kvfree(ohash); |
6fe1c7a5 PM |
676 | } |
677 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
678 | ||
679 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
680 | { | |
681 | unsigned int size = 4; | |
682 | ||
683 | clhash->hash = qdisc_class_hash_alloc(size); | |
ac8ef4ab | 684 | if (!clhash->hash) |
6fe1c7a5 PM |
685 | return -ENOMEM; |
686 | clhash->hashsize = size; | |
687 | clhash->hashmask = size - 1; | |
688 | clhash->hashelems = 0; | |
689 | return 0; | |
690 | } | |
691 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
692 | ||
693 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
694 | { | |
9695fe6f | 695 | kvfree(clhash->hash); |
6fe1c7a5 PM |
696 | } |
697 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
698 | ||
699 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
700 | struct Qdisc_class_common *cl) | |
701 | { | |
702 | unsigned int h; | |
703 | ||
704 | INIT_HLIST_NODE(&cl->hnode); | |
705 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
706 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
707 | clhash->hashelems++; | |
708 | } | |
709 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
710 | ||
711 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
712 | struct Qdisc_class_common *cl) | |
713 | { | |
714 | hlist_del(&cl->hnode); | |
715 | clhash->hashelems--; | |
716 | } | |
717 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
718 | ||
fa0f5aa7 ED |
719 | /* Allocate an unique handle from space managed by kernel |
720 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
721 | */ | |
1da177e4 LT |
722 | static u32 qdisc_alloc_handle(struct net_device *dev) |
723 | { | |
fa0f5aa7 | 724 | int i = 0x8000; |
1da177e4 LT |
725 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
726 | ||
727 | do { | |
728 | autohandle += TC_H_MAKE(0x10000U, 0); | |
729 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
730 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
731 | if (!qdisc_lookup(dev, autohandle)) |
732 | return autohandle; | |
733 | cond_resched(); | |
734 | } while (--i > 0); | |
1da177e4 | 735 | |
fa0f5aa7 | 736 | return 0; |
1da177e4 LT |
737 | } |
738 | ||
2ccccf5f WC |
739 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, unsigned int n, |
740 | unsigned int len) | |
43effa1e | 741 | { |
20fea08b | 742 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
743 | unsigned long cl; |
744 | u32 parentid; | |
95946658 | 745 | bool notify; |
2c8c8e6f | 746 | int drops; |
43effa1e | 747 | |
2ccccf5f | 748 | if (n == 0 && len == 0) |
43effa1e | 749 | return; |
2c8c8e6f | 750 | drops = max_t(int, n, 0); |
4eaf3b84 | 751 | rcu_read_lock(); |
43effa1e | 752 | while ((parentid = sch->parent)) { |
066a3b5b | 753 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 754 | break; |
066a3b5b | 755 | |
4eaf3b84 ED |
756 | if (sch->flags & TCQ_F_NOPARENT) |
757 | break; | |
95946658 KK |
758 | /* Notify parent qdisc only if child qdisc becomes empty. |
759 | * | |
760 | * If child was empty even before update then backlog | |
761 | * counter is screwed and we skip notification because | |
762 | * parent class is already passive. | |
763 | */ | |
764 | notify = !sch->q.qlen && !WARN_ON_ONCE(!n); | |
4eaf3b84 | 765 | /* TODO: perform the search on a per txq basis */ |
5ce2d488 | 766 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 767 | if (sch == NULL) { |
4eaf3b84 ED |
768 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
769 | break; | |
ffc8fefa | 770 | } |
43effa1e | 771 | cops = sch->ops->cl_ops; |
95946658 | 772 | if (notify && cops->qlen_notify) { |
143976ce | 773 | cl = cops->find(sch, parentid); |
43effa1e | 774 | cops->qlen_notify(sch, cl); |
43effa1e PM |
775 | } |
776 | sch->q.qlen -= n; | |
2ccccf5f | 777 | sch->qstats.backlog -= len; |
25331d6c | 778 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 779 | } |
4eaf3b84 | 780 | rcu_read_unlock(); |
43effa1e | 781 | } |
2ccccf5f | 782 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
1da177e4 | 783 | |
27d7f07c WC |
784 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, |
785 | u32 portid, u32 seq, u16 flags, int event) | |
786 | { | |
787 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; | |
788 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; | |
789 | struct tcmsg *tcm; | |
790 | struct nlmsghdr *nlh; | |
791 | unsigned char *b = skb_tail_pointer(skb); | |
792 | struct gnet_dump d; | |
793 | struct qdisc_size_table *stab; | |
794 | __u32 qlen; | |
795 | ||
796 | cond_resched(); | |
797 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
798 | if (!nlh) | |
799 | goto out_nlmsg_trim; | |
800 | tcm = nlmsg_data(nlh); | |
801 | tcm->tcm_family = AF_UNSPEC; | |
802 | tcm->tcm__pad1 = 0; | |
803 | tcm->tcm__pad2 = 0; | |
804 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
805 | tcm->tcm_parent = clid; | |
806 | tcm->tcm_handle = q->handle; | |
807 | tcm->tcm_info = refcount_read(&q->refcnt); | |
808 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
809 | goto nla_put_failure; | |
7a4fa291 YM |
810 | if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED))) |
811 | goto nla_put_failure; | |
27d7f07c WC |
812 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
813 | goto nla_put_failure; | |
7e66016f JF |
814 | |
815 | qlen = qdisc_qlen_sum(q); | |
27d7f07c WC |
816 | |
817 | stab = rtnl_dereference(q->stab); | |
818 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
819 | goto nla_put_failure; | |
820 | ||
821 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
822 | NULL, &d, TCA_PAD) < 0) | |
823 | goto nla_put_failure; | |
824 | ||
825 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
826 | goto nla_put_failure; | |
827 | ||
828 | if (qdisc_is_percpu_stats(q)) { | |
829 | cpu_bstats = q->cpu_bstats; | |
830 | cpu_qstats = q->cpu_qstats; | |
831 | } | |
832 | ||
833 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q), | |
834 | &d, cpu_bstats, &q->bstats) < 0 || | |
835 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || | |
836 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) | |
837 | goto nla_put_failure; | |
838 | ||
839 | if (gnet_stats_finish_copy(&d) < 0) | |
840 | goto nla_put_failure; | |
841 | ||
842 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
843 | return skb->len; | |
844 | ||
845 | out_nlmsg_trim: | |
846 | nla_put_failure: | |
847 | nlmsg_trim(skb, b); | |
848 | return -1; | |
849 | } | |
850 | ||
851 | static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible) | |
852 | { | |
853 | if (q->flags & TCQ_F_BUILTIN) | |
854 | return true; | |
855 | if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible) | |
856 | return true; | |
857 | ||
858 | return false; | |
859 | } | |
860 | ||
861 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, | |
862 | struct nlmsghdr *n, u32 clid, | |
863 | struct Qdisc *old, struct Qdisc *new) | |
864 | { | |
865 | struct sk_buff *skb; | |
866 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
867 | ||
868 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
869 | if (!skb) | |
870 | return -ENOBUFS; | |
871 | ||
872 | if (old && !tc_qdisc_dump_ignore(old, false)) { | |
873 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, | |
874 | 0, RTM_DELQDISC) < 0) | |
875 | goto err_out; | |
876 | } | |
877 | if (new && !tc_qdisc_dump_ignore(new, false)) { | |
878 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, | |
879 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
880 | goto err_out; | |
881 | } | |
882 | ||
883 | if (skb->len) | |
884 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
885 | n->nlmsg_flags & NLM_F_ECHO); | |
886 | ||
887 | err_out: | |
888 | kfree_skb(skb); | |
889 | return -EINVAL; | |
890 | } | |
891 | ||
7316ae88 TG |
892 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
893 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
894 | struct Qdisc *old, struct Qdisc *new) |
895 | { | |
896 | if (new || old) | |
7316ae88 | 897 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 898 | |
4d8863a2 | 899 | if (old) |
99194cff | 900 | qdisc_destroy(old); |
99194cff DM |
901 | } |
902 | ||
903 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
904 | * to device "dev". | |
905 | * | |
906 | * When appropriate send a netlink notification using 'skb' | |
907 | * and "n". | |
908 | * | |
909 | * On success, destroy old qdisc. | |
1da177e4 LT |
910 | */ |
911 | ||
912 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff | 913 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
09215598 AA |
914 | struct Qdisc *new, struct Qdisc *old, |
915 | struct netlink_ext_ack *extack) | |
1da177e4 | 916 | { |
99194cff | 917 | struct Qdisc *q = old; |
7316ae88 | 918 | struct net *net = dev_net(dev); |
1da177e4 | 919 | int err = 0; |
1da177e4 | 920 | |
10297b99 | 921 | if (parent == NULL) { |
99194cff DM |
922 | unsigned int i, num_q, ingress; |
923 | ||
924 | ingress = 0; | |
925 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
926 | if ((q && q->flags & TCQ_F_INGRESS) || |
927 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
928 | num_q = 1; |
929 | ingress = 1; | |
09215598 AA |
930 | if (!dev_ingress_queue(dev)) { |
931 | NL_SET_ERR_MSG(extack, "Device does not have an ingress queue"); | |
24824a09 | 932 | return -ENOENT; |
09215598 | 933 | } |
99194cff DM |
934 | } |
935 | ||
936 | if (dev->flags & IFF_UP) | |
937 | dev_deactivate(dev); | |
938 | ||
86e363dc WC |
939 | if (new && new->ops->attach) |
940 | goto skip; | |
6ec1c69a | 941 | |
99194cff | 942 | for (i = 0; i < num_q; i++) { |
24824a09 | 943 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
944 | |
945 | if (!ingress) | |
946 | dev_queue = netdev_get_tx_queue(dev, i); | |
947 | ||
8d50b53d DM |
948 | old = dev_graft_qdisc(dev_queue, new); |
949 | if (new && i > 0) | |
551143d8 | 950 | qdisc_refcount_inc(new); |
8d50b53d | 951 | |
036d6a67 JP |
952 | if (!ingress) |
953 | qdisc_destroy(old); | |
1da177e4 | 954 | } |
99194cff | 955 | |
86e363dc | 956 | skip: |
036d6a67 | 957 | if (!ingress) { |
7316ae88 TG |
958 | notify_and_destroy(net, skb, n, classid, |
959 | dev->qdisc, new); | |
036d6a67 | 960 | if (new && !new->ops->attach) |
551143d8 | 961 | qdisc_refcount_inc(new); |
036d6a67 | 962 | dev->qdisc = new ? : &noop_qdisc; |
86e363dc WC |
963 | |
964 | if (new && new->ops->attach) | |
965 | new->ops->attach(new); | |
036d6a67 | 966 | } else { |
7316ae88 | 967 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 968 | } |
af356afa | 969 | |
99194cff DM |
970 | if (dev->flags & IFF_UP) |
971 | dev_activate(dev); | |
1da177e4 | 972 | } else { |
20fea08b | 973 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 974 | |
c5ad119f JF |
975 | /* Only support running class lockless if parent is lockless */ |
976 | if (new && (new->flags & TCQ_F_NOLOCK) && | |
977 | parent && !(parent->flags & TCQ_F_NOLOCK)) | |
978 | new->flags &= ~TCQ_F_NOLOCK; | |
979 | ||
c9f1d038 PM |
980 | err = -EOPNOTSUPP; |
981 | if (cops && cops->graft) { | |
143976ce WC |
982 | unsigned long cl = cops->find(parent, classid); |
983 | ||
09215598 | 984 | if (cl) { |
653d6fd6 AA |
985 | err = cops->graft(parent, cl, new, &old, |
986 | extack); | |
09215598 AA |
987 | } else { |
988 | NL_SET_ERR_MSG(extack, "Specified class not found"); | |
c9f1d038 | 989 | err = -ENOENT; |
09215598 | 990 | } |
1da177e4 | 991 | } |
99194cff | 992 | if (!err) |
7316ae88 | 993 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
994 | } |
995 | return err; | |
996 | } | |
997 | ||
25bfcd5a JP |
998 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
999 | static struct lock_class_key qdisc_tx_lock; | |
1000 | static struct lock_class_key qdisc_rx_lock; | |
1001 | ||
1da177e4 LT |
1002 | /* |
1003 | Allocate and initialize new qdisc. | |
1004 | ||
1005 | Parameters are passed via opt. | |
1006 | */ | |
1007 | ||
5a7a5555 JHS |
1008 | static struct Qdisc *qdisc_create(struct net_device *dev, |
1009 | struct netdev_queue *dev_queue, | |
1010 | struct Qdisc *p, u32 parent, u32 handle, | |
09215598 AA |
1011 | struct nlattr **tca, int *errp, |
1012 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1013 | { |
1014 | int err; | |
1e90474c | 1015 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
1016 | struct Qdisc *sch; |
1017 | struct Qdisc_ops *ops; | |
175f9c1b | 1018 | struct qdisc_size_table *stab; |
1da177e4 LT |
1019 | |
1020 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 1021 | #ifdef CONFIG_MODULES |
1da177e4 LT |
1022 | if (ops == NULL && kind != NULL) { |
1023 | char name[IFNAMSIZ]; | |
1e90474c | 1024 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
1025 | /* We dropped the RTNL semaphore in order to |
1026 | * perform the module load. So, even if we | |
1027 | * succeeded in loading the module we have to | |
1028 | * tell the caller to replay the request. We | |
1029 | * indicate this using -EAGAIN. | |
1030 | * We replay the request because the device may | |
1031 | * go away in the mean time. | |
1032 | */ | |
1033 | rtnl_unlock(); | |
1034 | request_module("sch_%s", name); | |
1035 | rtnl_lock(); | |
1036 | ops = qdisc_lookup_ops(kind); | |
1037 | if (ops != NULL) { | |
1038 | /* We will try again qdisc_lookup_ops, | |
1039 | * so don't keep a reference. | |
1040 | */ | |
1041 | module_put(ops->owner); | |
1042 | err = -EAGAIN; | |
1043 | goto err_out; | |
1044 | } | |
1045 | } | |
1046 | } | |
1047 | #endif | |
1048 | ||
b9e2cc0f | 1049 | err = -ENOENT; |
09215598 AA |
1050 | if (!ops) { |
1051 | NL_SET_ERR_MSG(extack, "Specified qdisc not found"); | |
1da177e4 | 1052 | goto err_out; |
09215598 | 1053 | } |
1da177e4 | 1054 | |
d0bd684d | 1055 | sch = qdisc_alloc(dev_queue, ops, extack); |
3d54b82f TG |
1056 | if (IS_ERR(sch)) { |
1057 | err = PTR_ERR(sch); | |
1da177e4 | 1058 | goto err_out2; |
3d54b82f | 1059 | } |
1da177e4 | 1060 | |
ffc8fefa PM |
1061 | sch->parent = parent; |
1062 | ||
3d54b82f | 1063 | if (handle == TC_H_INGRESS) { |
1da177e4 | 1064 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 1065 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 1066 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 1067 | } else { |
fd44de7c PM |
1068 | if (handle == 0) { |
1069 | handle = qdisc_alloc_handle(dev); | |
1070 | err = -ENOMEM; | |
1071 | if (handle == 0) | |
1072 | goto err_out3; | |
1073 | } | |
25bfcd5a | 1074 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1abbe139 | 1075 | if (!netif_is_multiqueue(dev)) |
225734de | 1076 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
1077 | } |
1078 | ||
3d54b82f | 1079 | sch->handle = handle; |
1da177e4 | 1080 | |
84c46dd8 JDB |
1081 | /* This exist to keep backward compatible with a userspace |
1082 | * loophole, what allowed userspace to get IFF_NO_QUEUE | |
1083 | * facility on older kernels by setting tx_queue_len=0 (prior | |
1084 | * to qdisc init), and then forgot to reinit tx_queue_len | |
1085 | * before again attaching a qdisc. | |
1086 | */ | |
1087 | if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { | |
1088 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; | |
1089 | netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); | |
1090 | } | |
1091 | ||
54160ef6 | 1092 | if (ops->init) { |
e63d7dfd | 1093 | err = ops->init(sch, tca[TCA_OPTIONS], extack); |
54160ef6 AA |
1094 | if (err != 0) |
1095 | goto err_out5; | |
1096 | } | |
22e0f8b9 | 1097 | |
54160ef6 AA |
1098 | if (qdisc_is_percpu_stats(sch)) { |
1099 | sch->cpu_bstats = | |
1100 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
1101 | if (!sch->cpu_bstats) | |
1102 | goto err_out4; | |
f6f9b93f | 1103 | |
54160ef6 AA |
1104 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); |
1105 | if (!sch->cpu_qstats) | |
1106 | goto err_out4; | |
1107 | } | |
23bcf634 | 1108 | |
54160ef6 | 1109 | if (tca[TCA_STAB]) { |
09215598 | 1110 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
54160ef6 AA |
1111 | if (IS_ERR(stab)) { |
1112 | err = PTR_ERR(stab); | |
1113 | goto err_out4; | |
023e09a7 | 1114 | } |
54160ef6 AA |
1115 | rcu_assign_pointer(sch->stab, stab); |
1116 | } | |
1117 | if (tca[TCA_RATE]) { | |
1118 | seqcount_t *running; | |
f6e0b239 | 1119 | |
54160ef6 | 1120 | err = -EOPNOTSUPP; |
09215598 AA |
1121 | if (sch->flags & TCQ_F_MQROOT) { |
1122 | NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc"); | |
54160ef6 | 1123 | goto err_out4; |
09215598 | 1124 | } |
1da177e4 | 1125 | |
54160ef6 AA |
1126 | if (sch->parent != TC_H_ROOT && |
1127 | !(sch->flags & TCQ_F_INGRESS) && | |
1128 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
1129 | running = qdisc_root_sleeping_running(sch); | |
1130 | else | |
1131 | running = &sch->running; | |
1132 | ||
1133 | err = gen_new_estimator(&sch->bstats, | |
1134 | sch->cpu_bstats, | |
1135 | &sch->rate_est, | |
1136 | NULL, | |
1137 | running, | |
1138 | tca[TCA_RATE]); | |
09215598 AA |
1139 | if (err) { |
1140 | NL_SET_ERR_MSG(extack, "Failed to generate new estimator"); | |
54160ef6 | 1141 | goto err_out4; |
09215598 | 1142 | } |
1da177e4 | 1143 | } |
54160ef6 AA |
1144 | |
1145 | qdisc_hash_add(sch, false); | |
1146 | ||
1147 | return sch; | |
1148 | ||
1149 | err_out5: | |
87b60cfa | 1150 | /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ |
c1a4872e GF |
1151 | if (ops->destroy) |
1152 | ops->destroy(sch); | |
1da177e4 LT |
1153 | err_out3: |
1154 | dev_put(dev); | |
3d54b82f | 1155 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
1156 | err_out2: |
1157 | module_put(ops->owner); | |
1158 | err_out: | |
1159 | *errp = err; | |
1da177e4 | 1160 | return NULL; |
23bcf634 PM |
1161 | |
1162 | err_out4: | |
22e0f8b9 | 1163 | free_percpu(sch->cpu_bstats); |
b0ab6f92 | 1164 | free_percpu(sch->cpu_qstats); |
23bcf634 PM |
1165 | /* |
1166 | * Any broken qdiscs that would require a ops->reset() here? | |
1167 | * The qdisc was never in action so it shouldn't be necessary. | |
1168 | */ | |
a2da570d | 1169 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1170 | if (ops->destroy) |
1171 | ops->destroy(sch); | |
1172 | goto err_out3; | |
1da177e4 LT |
1173 | } |
1174 | ||
09215598 AA |
1175 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca, |
1176 | struct netlink_ext_ack *extack) | |
1da177e4 | 1177 | { |
a2da570d | 1178 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1179 | int err = 0; |
1da177e4 | 1180 | |
175f9c1b | 1181 | if (tca[TCA_OPTIONS]) { |
09215598 AA |
1182 | if (!sch->ops->change) { |
1183 | NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc"); | |
1da177e4 | 1184 | return -EINVAL; |
09215598 | 1185 | } |
2030721c | 1186 | err = sch->ops->change(sch, tca[TCA_OPTIONS], extack); |
1da177e4 LT |
1187 | if (err) |
1188 | return err; | |
1189 | } | |
175f9c1b JK |
1190 | |
1191 | if (tca[TCA_STAB]) { | |
09215598 | 1192 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
175f9c1b JK |
1193 | if (IS_ERR(stab)) |
1194 | return PTR_ERR(stab); | |
1195 | } | |
1196 | ||
a2da570d ED |
1197 | ostab = rtnl_dereference(sch->stab); |
1198 | rcu_assign_pointer(sch->stab, stab); | |
1199 | qdisc_put_stab(ostab); | |
175f9c1b | 1200 | |
23bcf634 | 1201 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1202 | /* NB: ignores errors from replace_estimator |
1203 | because change can't be undone. */ | |
23bcf634 PM |
1204 | if (sch->flags & TCQ_F_MQROOT) |
1205 | goto out; | |
22e0f8b9 JF |
1206 | gen_replace_estimator(&sch->bstats, |
1207 | sch->cpu_bstats, | |
1208 | &sch->rate_est, | |
edb09eb1 ED |
1209 | NULL, |
1210 | qdisc_root_sleeping_running(sch), | |
22e0f8b9 | 1211 | tca[TCA_RATE]); |
23bcf634 PM |
1212 | } |
1213 | out: | |
1da177e4 LT |
1214 | return 0; |
1215 | } | |
1216 | ||
cc7ec456 ED |
1217 | struct check_loop_arg { |
1218 | struct qdisc_walker w; | |
1da177e4 LT |
1219 | struct Qdisc *p; |
1220 | int depth; | |
1221 | }; | |
1222 | ||
5a7a5555 JHS |
1223 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, |
1224 | struct qdisc_walker *w); | |
1da177e4 LT |
1225 | |
1226 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1227 | { | |
1228 | struct check_loop_arg arg; | |
1229 | ||
1230 | if (q->ops->cl_ops == NULL) | |
1231 | return 0; | |
1232 | ||
1233 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1234 | arg.w.fn = check_loop_fn; | |
1235 | arg.depth = depth; | |
1236 | arg.p = p; | |
1237 | q->ops->cl_ops->walk(q, &arg.w); | |
1238 | return arg.w.stop ? -ELOOP : 0; | |
1239 | } | |
1240 | ||
1241 | static int | |
1242 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1243 | { | |
1244 | struct Qdisc *leaf; | |
20fea08b | 1245 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1246 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1247 | ||
1248 | leaf = cops->leaf(q, cl); | |
1249 | if (leaf) { | |
1250 | if (leaf == arg->p || arg->depth > 7) | |
1251 | return -ELOOP; | |
1252 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1253 | } | |
1254 | return 0; | |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * Delete/get qdisc. | |
1259 | */ | |
1260 | ||
c21ef3e3 DA |
1261 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1262 | struct netlink_ext_ack *extack) | |
1da177e4 | 1263 | { |
3b1e0a65 | 1264 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1265 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1266 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1267 | struct net_device *dev; |
de179c8c | 1268 | u32 clid; |
1da177e4 LT |
1269 | struct Qdisc *q = NULL; |
1270 | struct Qdisc *p = NULL; | |
1271 | int err; | |
1272 | ||
4e8bbb81 | 1273 | if ((n->nlmsg_type != RTM_GETQDISC) && |
5f013c9b | 1274 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1275 | return -EPERM; |
1276 | ||
c21ef3e3 | 1277 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack); |
1e90474c PM |
1278 | if (err < 0) |
1279 | return err; | |
1280 | ||
de179c8c H |
1281 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1282 | if (!dev) | |
1283 | return -ENODEV; | |
1284 | ||
1285 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1286 | if (clid) { |
1287 | if (clid != TC_H_ROOT) { | |
1288 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 | 1289 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1290 | if (!p) { |
1291 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid"); | |
1da177e4 | 1292 | return -ENOENT; |
09215598 | 1293 | } |
1da177e4 | 1294 | q = qdisc_leaf(p, clid); |
cc7ec456 ED |
1295 | } else if (dev_ingress_queue(dev)) { |
1296 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1297 | } |
1da177e4 | 1298 | } else { |
af356afa | 1299 | q = dev->qdisc; |
1da177e4 | 1300 | } |
09215598 AA |
1301 | if (!q) { |
1302 | NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device"); | |
1da177e4 | 1303 | return -ENOENT; |
09215598 | 1304 | } |
1da177e4 | 1305 | |
09215598 AA |
1306 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) { |
1307 | NL_SET_ERR_MSG(extack, "Invalid handle"); | |
1da177e4 | 1308 | return -EINVAL; |
09215598 | 1309 | } |
1da177e4 | 1310 | } else { |
cc7ec456 | 1311 | q = qdisc_lookup(dev, tcm->tcm_handle); |
09215598 AA |
1312 | if (!q) { |
1313 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle"); | |
1da177e4 | 1314 | return -ENOENT; |
09215598 | 1315 | } |
1da177e4 LT |
1316 | } |
1317 | ||
09215598 AA |
1318 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1319 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1320 | return -EINVAL; |
09215598 | 1321 | } |
1da177e4 LT |
1322 | |
1323 | if (n->nlmsg_type == RTM_DELQDISC) { | |
09215598 AA |
1324 | if (!clid) { |
1325 | NL_SET_ERR_MSG(extack, "Classid cannot be zero"); | |
1da177e4 | 1326 | return -EINVAL; |
09215598 AA |
1327 | } |
1328 | if (q->handle == 0) { | |
1329 | NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero"); | |
1da177e4 | 1330 | return -ENOENT; |
09215598 AA |
1331 | } |
1332 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack); | |
cc7ec456 | 1333 | if (err != 0) |
1da177e4 | 1334 | return err; |
1da177e4 | 1335 | } else { |
7316ae88 | 1336 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1337 | } |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | /* | |
cc7ec456 | 1342 | * Create/change qdisc. |
1da177e4 LT |
1343 | */ |
1344 | ||
c21ef3e3 DA |
1345 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1346 | struct netlink_ext_ack *extack) | |
1da177e4 | 1347 | { |
3b1e0a65 | 1348 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1349 | struct tcmsg *tcm; |
1e90474c | 1350 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1351 | struct net_device *dev; |
1352 | u32 clid; | |
1353 | struct Qdisc *q, *p; | |
1354 | int err; | |
1355 | ||
5f013c9b | 1356 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1357 | return -EPERM; |
1358 | ||
1da177e4 LT |
1359 | replay: |
1360 | /* Reinit, just in case something touches this. */ | |
c21ef3e3 | 1361 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack); |
de179c8c H |
1362 | if (err < 0) |
1363 | return err; | |
1364 | ||
02ef22ca | 1365 | tcm = nlmsg_data(n); |
1da177e4 LT |
1366 | clid = tcm->tcm_parent; |
1367 | q = p = NULL; | |
1368 | ||
cc7ec456 ED |
1369 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1370 | if (!dev) | |
1da177e4 LT |
1371 | return -ENODEV; |
1372 | ||
1e90474c | 1373 | |
1da177e4 LT |
1374 | if (clid) { |
1375 | if (clid != TC_H_ROOT) { | |
1376 | if (clid != TC_H_INGRESS) { | |
cc7ec456 | 1377 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1378 | if (!p) { |
1379 | NL_SET_ERR_MSG(extack, "Failed to find specified qdisc"); | |
1da177e4 | 1380 | return -ENOENT; |
09215598 | 1381 | } |
1da177e4 | 1382 | q = qdisc_leaf(p, clid); |
cc7ec456 ED |
1383 | } else if (dev_ingress_queue_create(dev)) { |
1384 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1385 | } |
1386 | } else { | |
af356afa | 1387 | q = dev->qdisc; |
1da177e4 LT |
1388 | } |
1389 | ||
1390 | /* It may be default qdisc, ignore it */ | |
1391 | if (q && q->handle == 0) | |
1392 | q = NULL; | |
1393 | ||
1394 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1395 | if (tcm->tcm_handle) { | |
09215598 AA |
1396 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) { |
1397 | NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override"); | |
1da177e4 | 1398 | return -EEXIST; |
09215598 AA |
1399 | } |
1400 | if (TC_H_MIN(tcm->tcm_handle)) { | |
1401 | NL_SET_ERR_MSG(extack, "Invalid minor handle"); | |
1da177e4 | 1402 | return -EINVAL; |
09215598 | 1403 | } |
cc7ec456 | 1404 | q = qdisc_lookup(dev, tcm->tcm_handle); |
8ec69574 | 1405 | if (!q) |
1da177e4 | 1406 | goto create_n_graft; |
09215598 AA |
1407 | if (n->nlmsg_flags & NLM_F_EXCL) { |
1408 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override"); | |
1da177e4 | 1409 | return -EEXIST; |
09215598 | 1410 | } |
0ac4bd68 | 1411 | if (tca[TCA_KIND] && |
09215598 AA |
1412 | nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1413 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1414 | return -EINVAL; |
09215598 | 1415 | } |
1da177e4 | 1416 | if (q == p || |
09215598 AA |
1417 | (p && check_loop(q, p, 0))) { |
1418 | NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected"); | |
1da177e4 | 1419 | return -ELOOP; |
09215598 | 1420 | } |
551143d8 | 1421 | qdisc_refcount_inc(q); |
1da177e4 LT |
1422 | goto graft; |
1423 | } else { | |
cc7ec456 | 1424 | if (!q) |
1da177e4 LT |
1425 | goto create_n_graft; |
1426 | ||
1427 | /* This magic test requires explanation. | |
1428 | * | |
1429 | * We know, that some child q is already | |
1430 | * attached to this parent and have choice: | |
1431 | * either to change it or to create/graft new one. | |
1432 | * | |
1433 | * 1. We are allowed to create/graft only | |
1434 | * if CREATE and REPLACE flags are set. | |
1435 | * | |
1436 | * 2. If EXCL is set, requestor wanted to say, | |
1437 | * that qdisc tcm_handle is not expected | |
1438 | * to exist, so that we choose create/graft too. | |
1439 | * | |
1440 | * 3. The last case is when no flags are set. | |
1441 | * Alas, it is sort of hole in API, we | |
1442 | * cannot decide what to do unambiguously. | |
1443 | * For now we select create/graft, if | |
1444 | * user gave KIND, which does not match existing. | |
1445 | */ | |
cc7ec456 ED |
1446 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1447 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1448 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1449 | (tca[TCA_KIND] && |
1450 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1451 | goto create_n_graft; |
1452 | } | |
1453 | } | |
1454 | } else { | |
09215598 AA |
1455 | if (!tcm->tcm_handle) { |
1456 | NL_SET_ERR_MSG(extack, "Handle cannot be zero"); | |
1da177e4 | 1457 | return -EINVAL; |
09215598 | 1458 | } |
1da177e4 LT |
1459 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1460 | } | |
1461 | ||
1462 | /* Change qdisc parameters */ | |
09215598 AA |
1463 | if (!q) { |
1464 | NL_SET_ERR_MSG(extack, "Specified qdisc not found"); | |
1da177e4 | 1465 | return -ENOENT; |
09215598 AA |
1466 | } |
1467 | if (n->nlmsg_flags & NLM_F_EXCL) { | |
1468 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify"); | |
1da177e4 | 1469 | return -EEXIST; |
09215598 AA |
1470 | } |
1471 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { | |
1472 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1473 | return -EINVAL; |
09215598 AA |
1474 | } |
1475 | err = qdisc_change(q, tca, extack); | |
1da177e4 | 1476 | if (err == 0) |
7316ae88 | 1477 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1478 | return err; |
1479 | ||
1480 | create_n_graft: | |
09215598 AA |
1481 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
1482 | NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag"); | |
1da177e4 | 1483 | return -ENOENT; |
09215598 | 1484 | } |
24824a09 | 1485 | if (clid == TC_H_INGRESS) { |
09215598 | 1486 | if (dev_ingress_queue(dev)) { |
24824a09 ED |
1487 | q = qdisc_create(dev, dev_ingress_queue(dev), p, |
1488 | tcm->tcm_parent, tcm->tcm_parent, | |
09215598 AA |
1489 | tca, &err, extack); |
1490 | } else { | |
1491 | NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device"); | |
24824a09 | 1492 | err = -ENOENT; |
09215598 | 1493 | } |
24824a09 | 1494 | } else { |
926e61b7 | 1495 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1496 | |
1497 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1498 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1499 | else if (p) | |
1500 | dev_queue = p->dev_queue; | |
1501 | else | |
1502 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1503 | |
926e61b7 | 1504 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1505 | tcm->tcm_parent, tcm->tcm_handle, |
09215598 | 1506 | tca, &err, extack); |
6ec1c69a | 1507 | } |
1da177e4 LT |
1508 | if (q == NULL) { |
1509 | if (err == -EAGAIN) | |
1510 | goto replay; | |
1511 | return err; | |
1512 | } | |
1513 | ||
1514 | graft: | |
09215598 | 1515 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack); |
e5befbd9 IJ |
1516 | if (err) { |
1517 | if (q) | |
1518 | qdisc_destroy(q); | |
1519 | return err; | |
1da177e4 | 1520 | } |
e5befbd9 | 1521 | |
1da177e4 LT |
1522 | return 0; |
1523 | } | |
1524 | ||
30723673 DM |
1525 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1526 | struct netlink_callback *cb, | |
49b49971 JK |
1527 | int *q_idx_p, int s_q_idx, bool recur, |
1528 | bool dump_invisible) | |
30723673 DM |
1529 | { |
1530 | int ret = 0, q_idx = *q_idx_p; | |
1531 | struct Qdisc *q; | |
59cc1f61 | 1532 | int b; |
30723673 DM |
1533 | |
1534 | if (!root) | |
1535 | return 0; | |
1536 | ||
1537 | q = root; | |
1538 | if (q_idx < s_q_idx) { | |
1539 | q_idx++; | |
1540 | } else { | |
49b49971 | 1541 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1542 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1543 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1544 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1545 | goto done; |
1546 | q_idx++; | |
1547 | } | |
69012ae4 | 1548 | |
ea327469 JK |
1549 | /* If dumping singletons, there is no qdisc_dev(root) and the singleton |
1550 | * itself has already been dumped. | |
1551 | * | |
1552 | * If we've already dumped the top-level (ingress) qdisc above and the global | |
1553 | * qdisc hashtable, we don't want to hit it again | |
1554 | */ | |
1555 | if (!qdisc_dev(root) || !recur) | |
69012ae4 JK |
1556 | goto out; |
1557 | ||
59cc1f61 | 1558 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1559 | if (q_idx < s_q_idx) { |
1560 | q_idx++; | |
1561 | continue; | |
1562 | } | |
49b49971 | 1563 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1564 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1565 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1566 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1567 | goto done; |
1568 | q_idx++; | |
1569 | } | |
1570 | ||
1571 | out: | |
1572 | *q_idx_p = q_idx; | |
1573 | return ret; | |
1574 | done: | |
1575 | ret = -1; | |
1576 | goto out; | |
1577 | } | |
1578 | ||
1da177e4 LT |
1579 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1580 | { | |
3b1e0a65 | 1581 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1582 | int idx, q_idx; |
1583 | int s_idx, s_q_idx; | |
1584 | struct net_device *dev; | |
49b49971 | 1585 | const struct nlmsghdr *nlh = cb->nlh; |
49b49971 JK |
1586 | struct nlattr *tca[TCA_MAX + 1]; |
1587 | int err; | |
1da177e4 LT |
1588 | |
1589 | s_idx = cb->args[0]; | |
1590 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1591 | |
7562f876 | 1592 | idx = 0; |
15dc36eb | 1593 | ASSERT_RTNL(); |
49b49971 | 1594 | |
7e5dd53f | 1595 | err = nlmsg_parse(nlh, sizeof(struct tcmsg), tca, TCA_MAX, NULL, NULL); |
49b49971 JK |
1596 | if (err < 0) |
1597 | return err; | |
1598 | ||
15dc36eb | 1599 | for_each_netdev(net, dev) { |
30723673 DM |
1600 | struct netdev_queue *dev_queue; |
1601 | ||
1da177e4 | 1602 | if (idx < s_idx) |
7562f876 | 1603 | goto cont; |
1da177e4 LT |
1604 | if (idx > s_idx) |
1605 | s_q_idx = 0; | |
1da177e4 | 1606 | q_idx = 0; |
30723673 | 1607 | |
5a7a5555 | 1608 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx, |
49b49971 | 1609 | true, tca[TCA_DUMP_INVISIBLE]) < 0) |
30723673 DM |
1610 | goto done; |
1611 | ||
24824a09 ED |
1612 | dev_queue = dev_ingress_queue(dev); |
1613 | if (dev_queue && | |
1614 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
49b49971 JK |
1615 | &q_idx, s_q_idx, false, |
1616 | tca[TCA_DUMP_INVISIBLE]) < 0) | |
30723673 DM |
1617 | goto done; |
1618 | ||
7562f876 PE |
1619 | cont: |
1620 | idx++; | |
1da177e4 LT |
1621 | } |
1622 | ||
1623 | done: | |
1da177e4 LT |
1624 | cb->args[0] = idx; |
1625 | cb->args[1] = q_idx; | |
1626 | ||
1627 | return skb->len; | |
1628 | } | |
1629 | ||
1630 | ||
1631 | ||
1632 | /************************************************ | |
1633 | * Traffic classes manipulation. * | |
1634 | ************************************************/ | |
1635 | ||
27d7f07c WC |
1636 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, |
1637 | unsigned long cl, | |
1638 | u32 portid, u32 seq, u16 flags, int event) | |
1639 | { | |
1640 | struct tcmsg *tcm; | |
1641 | struct nlmsghdr *nlh; | |
1642 | unsigned char *b = skb_tail_pointer(skb); | |
1643 | struct gnet_dump d; | |
1644 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; | |
1da177e4 | 1645 | |
27d7f07c WC |
1646 | cond_resched(); |
1647 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1648 | if (!nlh) | |
1649 | goto out_nlmsg_trim; | |
1650 | tcm = nlmsg_data(nlh); | |
1651 | tcm->tcm_family = AF_UNSPEC; | |
1652 | tcm->tcm__pad1 = 0; | |
1653 | tcm->tcm__pad2 = 0; | |
1654 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1655 | tcm->tcm_parent = q->handle; | |
1656 | tcm->tcm_handle = q->handle; | |
1657 | tcm->tcm_info = 0; | |
1658 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
1659 | goto nla_put_failure; | |
1660 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) | |
1661 | goto nla_put_failure; | |
1662 | ||
1663 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
1664 | NULL, &d, TCA_PAD) < 0) | |
1665 | goto nla_put_failure; | |
1666 | ||
1667 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1668 | goto nla_put_failure; | |
1669 | ||
1670 | if (gnet_stats_finish_copy(&d) < 0) | |
1671 | goto nla_put_failure; | |
1672 | ||
1673 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1674 | return skb->len; | |
1675 | ||
1676 | out_nlmsg_trim: | |
1677 | nla_put_failure: | |
1678 | nlmsg_trim(skb, b); | |
1679 | return -1; | |
1680 | } | |
1681 | ||
1682 | static int tclass_notify(struct net *net, struct sk_buff *oskb, | |
1683 | struct nlmsghdr *n, struct Qdisc *q, | |
1684 | unsigned long cl, int event) | |
1685 | { | |
1686 | struct sk_buff *skb; | |
1687 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1688 | ||
1689 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1690 | if (!skb) | |
1691 | return -ENOBUFS; | |
1692 | ||
1693 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { | |
1694 | kfree_skb(skb); | |
1695 | return -EINVAL; | |
1696 | } | |
1697 | ||
1698 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1699 | n->nlmsg_flags & NLM_F_ECHO); | |
1700 | } | |
1da177e4 | 1701 | |
14546ba1 WC |
1702 | static int tclass_del_notify(struct net *net, |
1703 | const struct Qdisc_class_ops *cops, | |
1704 | struct sk_buff *oskb, struct nlmsghdr *n, | |
1705 | struct Qdisc *q, unsigned long cl) | |
1706 | { | |
1707 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1708 | struct sk_buff *skb; | |
1709 | int err = 0; | |
1710 | ||
1711 | if (!cops->delete) | |
1712 | return -EOPNOTSUPP; | |
1713 | ||
1714 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1715 | if (!skb) | |
1716 | return -ENOBUFS; | |
1717 | ||
1718 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, | |
1719 | RTM_DELTCLASS) < 0) { | |
1720 | kfree_skb(skb); | |
1721 | return -EINVAL; | |
1722 | } | |
1723 | ||
1724 | err = cops->delete(q, cl); | |
1725 | if (err) { | |
1726 | kfree_skb(skb); | |
1727 | return err; | |
1728 | } | |
1729 | ||
1730 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1731 | n->nlmsg_flags & NLM_F_ECHO); | |
1732 | } | |
1733 | ||
07d79fc7 CW |
1734 | #ifdef CONFIG_NET_CLS |
1735 | ||
1736 | struct tcf_bind_args { | |
1737 | struct tcf_walker w; | |
1738 | u32 classid; | |
1739 | unsigned long cl; | |
1740 | }; | |
1741 | ||
1742 | static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg) | |
1743 | { | |
1744 | struct tcf_bind_args *a = (void *)arg; | |
1745 | ||
1746 | if (tp->ops->bind_class) { | |
74e3be60 JP |
1747 | struct Qdisc *q = tcf_block_q(tp->chain->block); |
1748 | ||
1749 | sch_tree_lock(q); | |
07d79fc7 | 1750 | tp->ops->bind_class(n, a->classid, a->cl); |
74e3be60 | 1751 | sch_tree_unlock(q); |
07d79fc7 CW |
1752 | } |
1753 | return 0; | |
1754 | } | |
1755 | ||
1756 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
1757 | unsigned long new_cl) | |
1758 | { | |
1759 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1760 | struct tcf_block *block; | |
1761 | struct tcf_chain *chain; | |
1762 | unsigned long cl; | |
1763 | ||
1764 | cl = cops->find(q, portid); | |
1765 | if (!cl) | |
1766 | return; | |
cbaacc4e | 1767 | block = cops->tcf_block(q, cl, NULL); |
07d79fc7 CW |
1768 | if (!block) |
1769 | return; | |
1770 | list_for_each_entry(chain, &block->chain_list, list) { | |
1771 | struct tcf_proto *tp; | |
1772 | ||
1773 | for (tp = rtnl_dereference(chain->filter_chain); | |
1774 | tp; tp = rtnl_dereference(tp->next)) { | |
1775 | struct tcf_bind_args arg = {}; | |
1776 | ||
1777 | arg.w.fn = tcf_node_bind; | |
1778 | arg.classid = clid; | |
1779 | arg.cl = new_cl; | |
1780 | tp->ops->walk(tp, &arg.w); | |
1781 | } | |
1782 | } | |
1783 | } | |
1784 | ||
1785 | #else | |
1786 | ||
1787 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
1788 | unsigned long new_cl) | |
1789 | { | |
1790 | } | |
1791 | ||
1792 | #endif | |
1793 | ||
c21ef3e3 DA |
1794 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, |
1795 | struct netlink_ext_ack *extack) | |
1da177e4 | 1796 | { |
3b1e0a65 | 1797 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1798 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1799 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1800 | struct net_device *dev; |
1801 | struct Qdisc *q = NULL; | |
20fea08b | 1802 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1803 | unsigned long cl = 0; |
1804 | unsigned long new_cl; | |
de179c8c H |
1805 | u32 portid; |
1806 | u32 clid; | |
1807 | u32 qid; | |
1da177e4 LT |
1808 | int err; |
1809 | ||
4e8bbb81 | 1810 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
5f013c9b | 1811 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1812 | return -EPERM; |
1813 | ||
c21ef3e3 | 1814 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack); |
1e90474c PM |
1815 | if (err < 0) |
1816 | return err; | |
1817 | ||
de179c8c H |
1818 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1819 | if (!dev) | |
1820 | return -ENODEV; | |
1821 | ||
1da177e4 LT |
1822 | /* |
1823 | parent == TC_H_UNSPEC - unspecified parent. | |
1824 | parent == TC_H_ROOT - class is root, which has no parent. | |
1825 | parent == X:0 - parent is root class. | |
1826 | parent == X:Y - parent is a node in hierarchy. | |
1827 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1828 | ||
1829 | handle == 0:0 - generate handle from kernel pool. | |
1830 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1831 | handle == X:Y - clear. | |
1832 | handle == X:0 - root class. | |
1833 | */ | |
1834 | ||
1835 | /* Step 1. Determine qdisc handle X:0 */ | |
1836 | ||
de179c8c H |
1837 | portid = tcm->tcm_parent; |
1838 | clid = tcm->tcm_handle; | |
1839 | qid = TC_H_MAJ(clid); | |
1840 | ||
15e47304 EB |
1841 | if (portid != TC_H_ROOT) { |
1842 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
1843 | |
1844 | if (qid && qid1) { | |
1845 | /* If both majors are known, they must be identical. */ | |
1846 | if (qid != qid1) | |
1847 | return -EINVAL; | |
1848 | } else if (qid1) { | |
1849 | qid = qid1; | |
1850 | } else if (qid == 0) | |
af356afa | 1851 | qid = dev->qdisc->handle; |
1da177e4 LT |
1852 | |
1853 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1854 | * both with parent and child. |
1855 | * | |
15e47304 | 1856 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 1857 | */ |
15e47304 EB |
1858 | if (portid) |
1859 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
1860 | } else { |
1861 | if (qid == 0) | |
af356afa | 1862 | qid = dev->qdisc->handle; |
1da177e4 LT |
1863 | } |
1864 | ||
1865 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1866 | q = qdisc_lookup(dev, qid); |
1867 | if (!q) | |
1da177e4 LT |
1868 | return -ENOENT; |
1869 | ||
1870 | /* An check that it supports classes */ | |
1871 | cops = q->ops->cl_ops; | |
1872 | if (cops == NULL) | |
1873 | return -EINVAL; | |
1874 | ||
1875 | /* Now try to get class */ | |
1876 | if (clid == 0) { | |
15e47304 | 1877 | if (portid == TC_H_ROOT) |
1da177e4 LT |
1878 | clid = qid; |
1879 | } else | |
1880 | clid = TC_H_MAKE(qid, clid); | |
1881 | ||
1882 | if (clid) | |
143976ce | 1883 | cl = cops->find(q, clid); |
1da177e4 LT |
1884 | |
1885 | if (cl == 0) { | |
1886 | err = -ENOENT; | |
cc7ec456 ED |
1887 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1888 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1889 | goto out; |
1890 | } else { | |
1891 | switch (n->nlmsg_type) { | |
10297b99 | 1892 | case RTM_NEWTCLASS: |
1da177e4 | 1893 | err = -EEXIST; |
cc7ec456 | 1894 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1895 | goto out; |
1896 | break; | |
1897 | case RTM_DELTCLASS: | |
14546ba1 | 1898 | err = tclass_del_notify(net, cops, skb, n, q, cl); |
07d79fc7 CW |
1899 | /* Unbind the class with flilters with 0 */ |
1900 | tc_bind_tclass(q, portid, clid, 0); | |
1da177e4 LT |
1901 | goto out; |
1902 | case RTM_GETTCLASS: | |
7316ae88 | 1903 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1904 | goto out; |
1905 | default: | |
1906 | err = -EINVAL; | |
1907 | goto out; | |
1908 | } | |
1909 | } | |
1910 | ||
1911 | new_cl = cl; | |
de6d5cdf PM |
1912 | err = -EOPNOTSUPP; |
1913 | if (cops->change) | |
793d81d6 | 1914 | err = cops->change(q, clid, portid, tca, &new_cl, extack); |
07d79fc7 | 1915 | if (err == 0) { |
7316ae88 | 1916 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
07d79fc7 CW |
1917 | /* We just create a new class, need to do reverse binding. */ |
1918 | if (cl != new_cl) | |
1919 | tc_bind_tclass(q, portid, clid, new_cl); | |
1920 | } | |
1da177e4 | 1921 | out: |
1da177e4 LT |
1922 | return err; |
1923 | } | |
1924 | ||
cc7ec456 ED |
1925 | struct qdisc_dump_args { |
1926 | struct qdisc_walker w; | |
1927 | struct sk_buff *skb; | |
1928 | struct netlink_callback *cb; | |
1da177e4 LT |
1929 | }; |
1930 | ||
5a7a5555 JHS |
1931 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, |
1932 | struct qdisc_walker *arg) | |
1da177e4 LT |
1933 | { |
1934 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1935 | ||
15e47304 | 1936 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
1937 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1938 | RTM_NEWTCLASS); | |
1da177e4 LT |
1939 | } |
1940 | ||
30723673 DM |
1941 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1942 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1943 | int *t_p, int s_t) | |
1944 | { | |
1945 | struct qdisc_dump_args arg; | |
1946 | ||
49b49971 | 1947 | if (tc_qdisc_dump_ignore(q, false) || |
30723673 DM |
1948 | *t_p < s_t || !q->ops->cl_ops || |
1949 | (tcm->tcm_parent && | |
1950 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1951 | (*t_p)++; | |
1952 | return 0; | |
1953 | } | |
1954 | if (*t_p > s_t) | |
1955 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1956 | arg.w.fn = qdisc_class_dump; | |
1957 | arg.skb = skb; | |
1958 | arg.cb = cb; | |
1959 | arg.w.stop = 0; | |
1960 | arg.w.skip = cb->args[1]; | |
1961 | arg.w.count = 0; | |
1962 | q->ops->cl_ops->walk(q, &arg.w); | |
1963 | cb->args[1] = arg.w.count; | |
1964 | if (arg.w.stop) | |
1965 | return -1; | |
1966 | (*t_p)++; | |
1967 | return 0; | |
1968 | } | |
1969 | ||
1970 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1971 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1972 | int *t_p, int s_t) | |
1973 | { | |
1974 | struct Qdisc *q; | |
59cc1f61 | 1975 | int b; |
30723673 DM |
1976 | |
1977 | if (!root) | |
1978 | return 0; | |
1979 | ||
1980 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1981 | return -1; | |
1982 | ||
69012ae4 JK |
1983 | if (!qdisc_dev(root)) |
1984 | return 0; | |
1985 | ||
cb395b20 ED |
1986 | if (tcm->tcm_parent) { |
1987 | q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent)); | |
1988 | if (q && tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1989 | return -1; | |
1990 | return 0; | |
1991 | } | |
59cc1f61 | 1992 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1993 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
1994 | return -1; | |
1995 | } | |
1996 | ||
1997 | return 0; | |
1998 | } | |
1999 | ||
1da177e4 LT |
2000 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
2001 | { | |
02ef22ca | 2002 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 2003 | struct net *net = sock_net(skb->sk); |
30723673 | 2004 | struct netdev_queue *dev_queue; |
1da177e4 | 2005 | struct net_device *dev; |
30723673 | 2006 | int t, s_t; |
1da177e4 | 2007 | |
573ce260 | 2008 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 2009 | return 0; |
cc7ec456 ED |
2010 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
2011 | if (!dev) | |
1da177e4 LT |
2012 | return 0; |
2013 | ||
2014 | s_t = cb->args[0]; | |
2015 | t = 0; | |
2016 | ||
af356afa | 2017 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
2018 | goto done; |
2019 | ||
24824a09 ED |
2020 | dev_queue = dev_ingress_queue(dev); |
2021 | if (dev_queue && | |
2022 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
2023 | &t, s_t) < 0) | |
30723673 | 2024 | goto done; |
1da177e4 | 2025 | |
30723673 | 2026 | done: |
1da177e4 LT |
2027 | cb->args[0] = t; |
2028 | ||
2029 | dev_put(dev); | |
2030 | return skb->len; | |
2031 | } | |
2032 | ||
1da177e4 LT |
2033 | #ifdef CONFIG_PROC_FS |
2034 | static int psched_show(struct seq_file *seq, void *v) | |
2035 | { | |
2036 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 2037 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 2038 | 1000000, |
1e317688 | 2039 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
2040 | |
2041 | return 0; | |
2042 | } | |
2043 | ||
2044 | static int psched_open(struct inode *inode, struct file *file) | |
2045 | { | |
7e5ab157 | 2046 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
2047 | } |
2048 | ||
da7071d7 | 2049 | static const struct file_operations psched_fops = { |
1da177e4 LT |
2050 | .owner = THIS_MODULE, |
2051 | .open = psched_open, | |
2052 | .read = seq_read, | |
2053 | .llseek = seq_lseek, | |
2054 | .release = single_release, | |
10297b99 | 2055 | }; |
7316ae88 TG |
2056 | |
2057 | static int __net_init psched_net_init(struct net *net) | |
2058 | { | |
2059 | struct proc_dir_entry *e; | |
2060 | ||
d4beaa66 | 2061 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
7316ae88 TG |
2062 | if (e == NULL) |
2063 | return -ENOMEM; | |
2064 | ||
2065 | return 0; | |
2066 | } | |
2067 | ||
2068 | static void __net_exit psched_net_exit(struct net *net) | |
2069 | { | |
ece31ffd | 2070 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
2071 | } |
2072 | #else | |
2073 | static int __net_init psched_net_init(struct net *net) | |
2074 | { | |
2075 | return 0; | |
2076 | } | |
2077 | ||
2078 | static void __net_exit psched_net_exit(struct net *net) | |
2079 | { | |
2080 | } | |
1da177e4 LT |
2081 | #endif |
2082 | ||
7316ae88 TG |
2083 | static struct pernet_operations psched_net_ops = { |
2084 | .init = psched_net_init, | |
2085 | .exit = psched_net_exit, | |
2086 | }; | |
2087 | ||
1da177e4 LT |
2088 | static int __init pktsched_init(void) |
2089 | { | |
7316ae88 TG |
2090 | int err; |
2091 | ||
2092 | err = register_pernet_subsys(&psched_net_ops); | |
2093 | if (err) { | |
cc7ec456 | 2094 | pr_err("pktsched_init: " |
7316ae88 TG |
2095 | "cannot initialize per netns operations\n"); |
2096 | return err; | |
2097 | } | |
2098 | ||
6da7c8fc | 2099 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
2100 | register_qdisc(&pfifo_qdisc_ops); |
2101 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 2102 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 2103 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 2104 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 2105 | |
b97bac64 FW |
2106 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0); |
2107 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0); | |
5a7a5555 | 2108 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, |
b97bac64 FW |
2109 | 0); |
2110 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0); | |
2111 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0); | |
5a7a5555 | 2112 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, |
b97bac64 | 2113 | 0); |
be577ddc | 2114 | |
1da177e4 LT |
2115 | return 0; |
2116 | } | |
2117 | ||
2118 | subsys_initcall(pktsched_init); |