Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/sch_api.c Packet scheduler API. | |
4 | * | |
1da177e4 LT |
5 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
6 | * | |
7 | * Fixes: | |
8 | * | |
9 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. | |
10 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
11 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support | |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/types.h> | |
16 | #include <linux/kernel.h> | |
1da177e4 | 17 | #include <linux/string.h> |
1da177e4 | 18 | #include <linux/errno.h> |
1da177e4 | 19 | #include <linux/skbuff.h> |
1da177e4 LT |
20 | #include <linux/init.h> |
21 | #include <linux/proc_fs.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/kmod.h> | |
24 | #include <linux/list.h> | |
4179477f | 25 | #include <linux/hrtimer.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
59cc1f61 | 27 | #include <linux/hashtable.h> |
1da177e4 | 28 | |
457c4cbc | 29 | #include <net/net_namespace.h> |
b854272b | 30 | #include <net/sock.h> |
dc5fc579 | 31 | #include <net/netlink.h> |
1da177e4 | 32 | #include <net/pkt_sched.h> |
07d79fc7 | 33 | #include <net/pkt_cls.h> |
1da177e4 | 34 | |
f5a7833e CW |
35 | #include <trace/events/qdisc.h> |
36 | ||
1da177e4 LT |
37 | /* |
38 | ||
39 | Short review. | |
40 | ------------- | |
41 | ||
42 | This file consists of two interrelated parts: | |
43 | ||
44 | 1. queueing disciplines manager frontend. | |
45 | 2. traffic classes manager frontend. | |
46 | ||
47 | Generally, queueing discipline ("qdisc") is a black box, | |
48 | which is able to enqueue packets and to dequeue them (when | |
49 | device is ready to send something) in order and at times | |
50 | determined by algorithm hidden in it. | |
51 | ||
52 | qdisc's are divided to two categories: | |
53 | - "queues", which have no internal structure visible from outside. | |
54 | - "schedulers", which split all the packets to "traffic classes", | |
55 | using "packet classifiers" (look at cls_api.c) | |
56 | ||
57 | In turn, classes may have child qdiscs (as rule, queues) | |
58 | attached to them etc. etc. etc. | |
59 | ||
60 | The goal of the routines in this file is to translate | |
61 | information supplied by user in the form of handles | |
62 | to more intelligible for kernel form, to make some sanity | |
63 | checks and part of work, which is common to all qdiscs | |
64 | and to provide rtnetlink notifications. | |
65 | ||
66 | All real intelligent work is done inside qdisc modules. | |
67 | ||
68 | ||
69 | ||
70 | Every discipline has two major routines: enqueue and dequeue. | |
71 | ||
72 | ---dequeue | |
73 | ||
74 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
75 | but it does not mean that queue is empty, it just means that | |
76 | discipline does not want to send anything this time. | |
77 | Queue is really empty if q->q.qlen == 0. | |
78 | For complicated disciplines with multiple queues q->q is not | |
79 | real packet queue, but however q->q.qlen must be valid. | |
80 | ||
81 | ---enqueue | |
82 | ||
83 | enqueue returns 0, if packet was enqueued successfully. | |
84 | If packet (this one or another one) was dropped, it returns | |
85 | not zero error code. | |
86 | NET_XMIT_DROP - this packet dropped | |
87 | Expected action: do not backoff, but wait until queue will clear. | |
88 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
89 | Expected action: backoff or ignore | |
1da177e4 LT |
90 | |
91 | Auxiliary routines: | |
92 | ||
99c0db26 JP |
93 | ---peek |
94 | ||
95 | like dequeue but without removing a packet from the queue | |
96 | ||
1da177e4 LT |
97 | ---reset |
98 | ||
99 | returns qdisc to initial state: purge all buffers, clear all | |
100 | timers, counters (except for statistics) etc. | |
101 | ||
102 | ---init | |
103 | ||
104 | initializes newly created qdisc. | |
105 | ||
106 | ---destroy | |
107 | ||
108 | destroys resources allocated by init and during lifetime of qdisc. | |
109 | ||
110 | ---change | |
111 | ||
112 | changes qdisc parameters. | |
113 | */ | |
114 | ||
115 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
116 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
117 | ||
118 | ||
119 | /************************************************ | |
120 | * Queueing disciplines manipulation. * | |
121 | ************************************************/ | |
122 | ||
123 | ||
124 | /* The list of all installed queueing disciplines. */ | |
125 | ||
126 | static struct Qdisc_ops *qdisc_base; | |
127 | ||
21eb2189 | 128 | /* Register/unregister queueing discipline */ |
1da177e4 LT |
129 | |
130 | int register_qdisc(struct Qdisc_ops *qops) | |
131 | { | |
132 | struct Qdisc_ops *q, **qp; | |
133 | int rc = -EEXIST; | |
134 | ||
135 | write_lock(&qdisc_mod_lock); | |
136 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
137 | if (!strcmp(qops->id, q->id)) | |
138 | goto out; | |
139 | ||
140 | if (qops->enqueue == NULL) | |
141 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 | 142 | if (qops->peek == NULL) { |
68fd26b5 | 143 | if (qops->dequeue == NULL) |
99c0db26 | 144 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
145 | else |
146 | goto out_einval; | |
99c0db26 | 147 | } |
1da177e4 LT |
148 | if (qops->dequeue == NULL) |
149 | qops->dequeue = noop_qdisc_ops.dequeue; | |
150 | ||
68fd26b5 JP |
151 | if (qops->cl_ops) { |
152 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
153 | ||
143976ce | 154 | if (!(cops->find && cops->walk && cops->leaf)) |
68fd26b5 JP |
155 | goto out_einval; |
156 | ||
6529eaba | 157 | if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf)) |
68fd26b5 JP |
158 | goto out_einval; |
159 | } | |
160 | ||
1da177e4 LT |
161 | qops->next = NULL; |
162 | *qp = qops; | |
163 | rc = 0; | |
164 | out: | |
165 | write_unlock(&qdisc_mod_lock); | |
166 | return rc; | |
68fd26b5 JP |
167 | |
168 | out_einval: | |
169 | rc = -EINVAL; | |
170 | goto out; | |
1da177e4 | 171 | } |
62e3ba1b | 172 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
173 | |
174 | int unregister_qdisc(struct Qdisc_ops *qops) | |
175 | { | |
176 | struct Qdisc_ops *q, **qp; | |
177 | int err = -ENOENT; | |
178 | ||
179 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 180 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
181 | if (q == qops) |
182 | break; | |
183 | if (q) { | |
184 | *qp = q->next; | |
185 | q->next = NULL; | |
186 | err = 0; | |
187 | } | |
188 | write_unlock(&qdisc_mod_lock); | |
189 | return err; | |
190 | } | |
62e3ba1b | 191 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 | 192 | |
6da7c8fc | 193 | /* Get default qdisc if not otherwise specified */ |
194 | void qdisc_get_default(char *name, size_t len) | |
195 | { | |
196 | read_lock(&qdisc_mod_lock); | |
197 | strlcpy(name, default_qdisc_ops->id, len); | |
198 | read_unlock(&qdisc_mod_lock); | |
199 | } | |
200 | ||
201 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) | |
202 | { | |
203 | struct Qdisc_ops *q = NULL; | |
204 | ||
205 | for (q = qdisc_base; q; q = q->next) { | |
206 | if (!strcmp(name, q->id)) { | |
207 | if (!try_module_get(q->owner)) | |
208 | q = NULL; | |
209 | break; | |
210 | } | |
211 | } | |
212 | ||
213 | return q; | |
214 | } | |
215 | ||
216 | /* Set new default qdisc to use */ | |
217 | int qdisc_set_default(const char *name) | |
218 | { | |
219 | const struct Qdisc_ops *ops; | |
220 | ||
221 | if (!capable(CAP_NET_ADMIN)) | |
222 | return -EPERM; | |
223 | ||
224 | write_lock(&qdisc_mod_lock); | |
225 | ops = qdisc_lookup_default(name); | |
226 | if (!ops) { | |
227 | /* Not found, drop lock and try to load module */ | |
228 | write_unlock(&qdisc_mod_lock); | |
229 | request_module("sch_%s", name); | |
230 | write_lock(&qdisc_mod_lock); | |
231 | ||
232 | ops = qdisc_lookup_default(name); | |
233 | } | |
234 | ||
235 | if (ops) { | |
236 | /* Set new default */ | |
237 | module_put(default_qdisc_ops->owner); | |
238 | default_qdisc_ops = ops; | |
239 | } | |
240 | write_unlock(&qdisc_mod_lock); | |
241 | ||
242 | return ops ? 0 : -ENOENT; | |
243 | } | |
244 | ||
8ea3e439 | 245 | #ifdef CONFIG_NET_SCH_DEFAULT |
246 | /* Set default value from kernel config */ | |
247 | static int __init sch_default_qdisc(void) | |
248 | { | |
249 | return qdisc_set_default(CONFIG_DEFAULT_NET_SCH); | |
250 | } | |
251 | late_initcall(sch_default_qdisc); | |
252 | #endif | |
253 | ||
1da177e4 | 254 | /* We know handle. Find qdisc among all qdisc's attached to device |
4eaf3b84 ED |
255 | * (root qdisc, all its children, children of children etc.) |
256 | * Note: caller either uses rtnl or rcu_read_lock() | |
1da177e4 LT |
257 | */ |
258 | ||
6113b748 | 259 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
260 | { |
261 | struct Qdisc *q; | |
262 | ||
69012ae4 JK |
263 | if (!qdisc_dev(root)) |
264 | return (root->handle == handle ? root : NULL); | |
265 | ||
8123b421 DM |
266 | if (!(root->flags & TCQ_F_BUILTIN) && |
267 | root->handle == handle) | |
268 | return root; | |
269 | ||
a8b7b2d0 JP |
270 | hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle, |
271 | lockdep_rtnl_is_held()) { | |
8123b421 DM |
272 | if (q->handle == handle) |
273 | return q; | |
274 | } | |
275 | return NULL; | |
276 | } | |
277 | ||
49b49971 | 278 | void qdisc_hash_add(struct Qdisc *q, bool invisible) |
f6e0b239 | 279 | { |
37314363 | 280 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
4eaf3b84 | 281 | ASSERT_RTNL(); |
59cc1f61 | 282 | hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle); |
49b49971 JK |
283 | if (invisible) |
284 | q->flags |= TCQ_F_INVISIBLE; | |
37314363 | 285 | } |
f6e0b239 | 286 | } |
59cc1f61 | 287 | EXPORT_SYMBOL(qdisc_hash_add); |
f6e0b239 | 288 | |
59cc1f61 | 289 | void qdisc_hash_del(struct Qdisc *q) |
f6e0b239 | 290 | { |
4eaf3b84 ED |
291 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
292 | ASSERT_RTNL(); | |
59cc1f61 | 293 | hash_del_rcu(&q->hash); |
4eaf3b84 | 294 | } |
f6e0b239 | 295 | } |
59cc1f61 | 296 | EXPORT_SYMBOL(qdisc_hash_del); |
f6e0b239 | 297 | |
ead81cc5 | 298 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 299 | { |
f6e0b239 JP |
300 | struct Qdisc *q; |
301 | ||
50317fce CW |
302 | if (!handle) |
303 | return NULL; | |
af356afa PM |
304 | q = qdisc_match_from_root(dev->qdisc, handle); |
305 | if (q) | |
306 | goto out; | |
f6e0b239 | 307 | |
24824a09 ED |
308 | if (dev_ingress_queue(dev)) |
309 | q = qdisc_match_from_root( | |
310 | dev_ingress_queue(dev)->qdisc_sleeping, | |
311 | handle); | |
f6486d40 | 312 | out: |
f6e0b239 | 313 | return q; |
1da177e4 LT |
314 | } |
315 | ||
3a7d0d07 VB |
316 | struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle) |
317 | { | |
318 | struct netdev_queue *nq; | |
319 | struct Qdisc *q; | |
320 | ||
321 | if (!handle) | |
322 | return NULL; | |
323 | q = qdisc_match_from_root(dev->qdisc, handle); | |
324 | if (q) | |
325 | goto out; | |
326 | ||
327 | nq = dev_ingress_queue_rcu(dev); | |
328 | if (nq) | |
329 | q = qdisc_match_from_root(nq->qdisc_sleeping, handle); | |
330 | out: | |
331 | return q; | |
332 | } | |
333 | ||
1da177e4 LT |
334 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) |
335 | { | |
336 | unsigned long cl; | |
20fea08b | 337 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
338 | |
339 | if (cops == NULL) | |
340 | return NULL; | |
143976ce | 341 | cl = cops->find(p, classid); |
1da177e4 LT |
342 | |
343 | if (cl == 0) | |
344 | return NULL; | |
2561f972 | 345 | return cops->leaf(p, cl); |
1da177e4 LT |
346 | } |
347 | ||
348 | /* Find queueing discipline by name */ | |
349 | ||
1e90474c | 350 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
351 | { |
352 | struct Qdisc_ops *q = NULL; | |
353 | ||
354 | if (kind) { | |
355 | read_lock(&qdisc_mod_lock); | |
356 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 357 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
358 | if (!try_module_get(q->owner)) |
359 | q = NULL; | |
360 | break; | |
361 | } | |
362 | } | |
363 | read_unlock(&qdisc_mod_lock); | |
364 | } | |
365 | return q; | |
366 | } | |
367 | ||
8a8e3d84 JDB |
368 | /* The linklayer setting were not transferred from iproute2, in older |
369 | * versions, and the rate tables lookup systems have been dropped in | |
370 | * the kernel. To keep backward compatible with older iproute2 tc | |
371 | * utils, we detect the linklayer setting by detecting if the rate | |
372 | * table were modified. | |
373 | * | |
374 | * For linklayer ATM table entries, the rate table will be aligned to | |
375 | * 48 bytes, thus some table entries will contain the same value. The | |
376 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
377 | * starting from the mpu, we find low and high table entries for | |
378 | * mapping this cell. If these entries contain the same value, when | |
379 | * the rate tables have been modified for linklayer ATM. | |
380 | * | |
381 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
382 | * and then roundup to the next cell, calc the table entry one below, | |
383 | * and compare. | |
384 | */ | |
385 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
386 | { | |
387 | int low = roundup(r->mpu, 48); | |
388 | int high = roundup(low+1, 48); | |
389 | int cell_low = low >> r->cell_log; | |
390 | int cell_high = (high >> r->cell_log) - 1; | |
391 | ||
392 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
393 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
394 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
395 | return TC_LINKLAYER_ETHERNET; | |
396 | } | |
397 | ||
398 | if ((cell_high > cell_low) && (cell_high < 256) | |
399 | && (rtab[cell_low] == rtab[cell_high])) { | |
400 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
401 | cell_low, cell_high, rtab[cell_high]); | |
402 | return TC_LINKLAYER_ATM; | |
403 | } | |
404 | return TC_LINKLAYER_ETHERNET; | |
405 | } | |
406 | ||
1da177e4 LT |
407 | static struct qdisc_rate_table *qdisc_rtab_list; |
408 | ||
5a7a5555 | 409 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
e9bc3fa2 AA |
410 | struct nlattr *tab, |
411 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
412 | { |
413 | struct qdisc_rate_table *rtab; | |
414 | ||
40edeff6 | 415 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
e9bc3fa2 AA |
416 | nla_len(tab) != TC_RTAB_SIZE) { |
417 | NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching"); | |
40edeff6 | 418 | return NULL; |
e9bc3fa2 | 419 | } |
40edeff6 | 420 | |
1da177e4 | 421 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
422 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
423 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
424 | rtab->refcnt++; |
425 | return rtab; | |
426 | } | |
427 | } | |
428 | ||
1da177e4 LT |
429 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
430 | if (rtab) { | |
431 | rtab->rate = *r; | |
432 | rtab->refcnt = 1; | |
1e90474c | 433 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
434 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
435 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
436 | rtab->next = qdisc_rtab_list; |
437 | qdisc_rtab_list = rtab; | |
e9bc3fa2 AA |
438 | } else { |
439 | NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table"); | |
1da177e4 LT |
440 | } |
441 | return rtab; | |
442 | } | |
62e3ba1b | 443 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
444 | |
445 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
446 | { | |
447 | struct qdisc_rate_table *rtab, **rtabp; | |
448 | ||
449 | if (!tab || --tab->refcnt) | |
450 | return; | |
451 | ||
cc7ec456 ED |
452 | for (rtabp = &qdisc_rtab_list; |
453 | (rtab = *rtabp) != NULL; | |
454 | rtabp = &rtab->next) { | |
1da177e4 LT |
455 | if (rtab == tab) { |
456 | *rtabp = rtab->next; | |
457 | kfree(rtab); | |
458 | return; | |
459 | } | |
460 | } | |
461 | } | |
62e3ba1b | 462 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 463 | |
175f9c1b | 464 | static LIST_HEAD(qdisc_stab_list); |
175f9c1b JK |
465 | |
466 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
467 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
468 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
469 | }; | |
470 | ||
09215598 AA |
471 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt, |
472 | struct netlink_ext_ack *extack) | |
175f9c1b JK |
473 | { |
474 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
475 | struct qdisc_size_table *stab; | |
476 | struct tc_sizespec *s; | |
477 | unsigned int tsize = 0; | |
478 | u16 *tab = NULL; | |
479 | int err; | |
480 | ||
8cb08174 JB |
481 | err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy, |
482 | extack); | |
175f9c1b JK |
483 | if (err < 0) |
484 | return ERR_PTR(err); | |
09215598 AA |
485 | if (!tb[TCA_STAB_BASE]) { |
486 | NL_SET_ERR_MSG(extack, "Size table base attribute is missing"); | |
175f9c1b | 487 | return ERR_PTR(-EINVAL); |
09215598 | 488 | } |
175f9c1b JK |
489 | |
490 | s = nla_data(tb[TCA_STAB_BASE]); | |
491 | ||
492 | if (s->tsize > 0) { | |
09215598 AA |
493 | if (!tb[TCA_STAB_DATA]) { |
494 | NL_SET_ERR_MSG(extack, "Size table data attribute is missing"); | |
175f9c1b | 495 | return ERR_PTR(-EINVAL); |
09215598 | 496 | } |
175f9c1b JK |
497 | tab = nla_data(tb[TCA_STAB_DATA]); |
498 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
499 | } | |
500 | ||
09215598 AA |
501 | if (tsize != s->tsize || (!tab && tsize > 0)) { |
502 | NL_SET_ERR_MSG(extack, "Invalid size of size table"); | |
175f9c1b | 503 | return ERR_PTR(-EINVAL); |
09215598 | 504 | } |
175f9c1b | 505 | |
175f9c1b JK |
506 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
507 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
508 | continue; | |
509 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
510 | continue; | |
511 | stab->refcnt++; | |
175f9c1b JK |
512 | return stab; |
513 | } | |
514 | ||
175f9c1b JK |
515 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); |
516 | if (!stab) | |
517 | return ERR_PTR(-ENOMEM); | |
518 | ||
519 | stab->refcnt = 1; | |
520 | stab->szopts = *s; | |
521 | if (tsize > 0) | |
522 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
523 | ||
175f9c1b | 524 | list_add_tail(&stab->list, &qdisc_stab_list); |
175f9c1b JK |
525 | |
526 | return stab; | |
527 | } | |
528 | ||
529 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
530 | { | |
531 | if (!tab) | |
532 | return; | |
533 | ||
175f9c1b JK |
534 | if (--tab->refcnt == 0) { |
535 | list_del(&tab->list); | |
6e07902f | 536 | kfree_rcu(tab, rcu); |
175f9c1b | 537 | } |
175f9c1b JK |
538 | } |
539 | EXPORT_SYMBOL(qdisc_put_stab); | |
540 | ||
541 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
542 | { | |
543 | struct nlattr *nest; | |
544 | ||
ae0be8de | 545 | nest = nla_nest_start_noflag(skb, TCA_STAB); |
3aa4614d PM |
546 | if (nest == NULL) |
547 | goto nla_put_failure; | |
1b34ec43 DM |
548 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
549 | goto nla_put_failure; | |
175f9c1b JK |
550 | nla_nest_end(skb, nest); |
551 | ||
552 | return skb->len; | |
553 | ||
554 | nla_put_failure: | |
555 | return -1; | |
556 | } | |
557 | ||
5a7a5555 JHS |
558 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
559 | const struct qdisc_size_table *stab) | |
175f9c1b JK |
560 | { |
561 | int pkt_len, slot; | |
562 | ||
563 | pkt_len = skb->len + stab->szopts.overhead; | |
564 | if (unlikely(!stab->szopts.tsize)) | |
565 | goto out; | |
566 | ||
567 | slot = pkt_len + stab->szopts.cell_align; | |
568 | if (unlikely(slot < 0)) | |
569 | slot = 0; | |
570 | ||
571 | slot >>= stab->szopts.cell_log; | |
572 | if (likely(slot < stab->szopts.tsize)) | |
573 | pkt_len = stab->data[slot]; | |
574 | else | |
575 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
576 | (slot / stab->szopts.tsize) + | |
577 | stab->data[slot % stab->szopts.tsize]; | |
578 | ||
579 | pkt_len <<= stab->szopts.size_log; | |
580 | out: | |
581 | if (unlikely(pkt_len < 1)) | |
582 | pkt_len = 1; | |
583 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
584 | } | |
a2da570d | 585 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 586 | |
6e765a00 | 587 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
588 | { |
589 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
590 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
591 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
592 | qdisc->flags |= TCQ_F_WARN_NONWC; |
593 | } | |
594 | } | |
595 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
596 | ||
4179477f PM |
597 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
598 | { | |
599 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 600 | timer); |
4179477f | 601 | |
1e203c1a | 602 | rcu_read_lock(); |
8608db03 | 603 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 604 | rcu_read_unlock(); |
1936502d | 605 | |
4179477f PM |
606 | return HRTIMER_NORESTART; |
607 | } | |
608 | ||
860b642b VCG |
609 | void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc, |
610 | clockid_t clockid) | |
4179477f | 611 | { |
860b642b | 612 | hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 613 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
614 | wd->qdisc = qdisc; |
615 | } | |
860b642b VCG |
616 | EXPORT_SYMBOL(qdisc_watchdog_init_clockid); |
617 | ||
618 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
619 | { | |
620 | qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC); | |
621 | } | |
4179477f PM |
622 | EXPORT_SYMBOL(qdisc_watchdog_init); |
623 | ||
efe074c2 ED |
624 | void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires, |
625 | u64 delta_ns) | |
4179477f | 626 | { |
2540e051 JP |
627 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
628 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
629 | return; | |
630 | ||
b88948fb ED |
631 | if (hrtimer_is_queued(&wd->timer)) { |
632 | /* If timer is already set in [expires, expires + delta_ns], | |
633 | * do not reprogram it. | |
634 | */ | |
635 | if (wd->last_expires - expires <= delta_ns) | |
636 | return; | |
637 | } | |
a9efad8b ED |
638 | |
639 | wd->last_expires = expires; | |
efe074c2 ED |
640 | hrtimer_start_range_ns(&wd->timer, |
641 | ns_to_ktime(expires), | |
642 | delta_ns, | |
643 | HRTIMER_MODE_ABS_PINNED); | |
4179477f | 644 | } |
efe074c2 | 645 | EXPORT_SYMBOL(qdisc_watchdog_schedule_range_ns); |
4179477f PM |
646 | |
647 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
648 | { | |
2fbd3da3 | 649 | hrtimer_cancel(&wd->timer); |
4179477f PM |
650 | } |
651 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 652 | |
a94f779f | 653 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 | 654 | { |
6fe1c7a5 | 655 | struct hlist_head *h; |
9695fe6f | 656 | unsigned int i; |
6fe1c7a5 | 657 | |
9695fe6f | 658 | h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL); |
6fe1c7a5 PM |
659 | |
660 | if (h != NULL) { | |
661 | for (i = 0; i < n; i++) | |
662 | INIT_HLIST_HEAD(&h[i]); | |
663 | } | |
664 | return h; | |
665 | } | |
666 | ||
6fe1c7a5 PM |
667 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) |
668 | { | |
669 | struct Qdisc_class_common *cl; | |
b67bfe0d | 670 | struct hlist_node *next; |
6fe1c7a5 PM |
671 | struct hlist_head *nhash, *ohash; |
672 | unsigned int nsize, nmask, osize; | |
673 | unsigned int i, h; | |
674 | ||
675 | /* Rehash when load factor exceeds 0.75 */ | |
676 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
677 | return; | |
678 | nsize = clhash->hashsize * 2; | |
679 | nmask = nsize - 1; | |
680 | nhash = qdisc_class_hash_alloc(nsize); | |
681 | if (nhash == NULL) | |
682 | return; | |
683 | ||
684 | ohash = clhash->hash; | |
685 | osize = clhash->hashsize; | |
686 | ||
687 | sch_tree_lock(sch); | |
688 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 689 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
690 | h = qdisc_class_hash(cl->classid, nmask); |
691 | hlist_add_head(&cl->hnode, &nhash[h]); | |
692 | } | |
693 | } | |
694 | clhash->hash = nhash; | |
695 | clhash->hashsize = nsize; | |
696 | clhash->hashmask = nmask; | |
697 | sch_tree_unlock(sch); | |
698 | ||
9695fe6f | 699 | kvfree(ohash); |
6fe1c7a5 PM |
700 | } |
701 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
702 | ||
703 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
704 | { | |
705 | unsigned int size = 4; | |
706 | ||
707 | clhash->hash = qdisc_class_hash_alloc(size); | |
ac8ef4ab | 708 | if (!clhash->hash) |
6fe1c7a5 PM |
709 | return -ENOMEM; |
710 | clhash->hashsize = size; | |
711 | clhash->hashmask = size - 1; | |
712 | clhash->hashelems = 0; | |
713 | return 0; | |
714 | } | |
715 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
716 | ||
717 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
718 | { | |
9695fe6f | 719 | kvfree(clhash->hash); |
6fe1c7a5 PM |
720 | } |
721 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
722 | ||
723 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
724 | struct Qdisc_class_common *cl) | |
725 | { | |
726 | unsigned int h; | |
727 | ||
728 | INIT_HLIST_NODE(&cl->hnode); | |
729 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
730 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
731 | clhash->hashelems++; | |
732 | } | |
733 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
734 | ||
735 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
736 | struct Qdisc_class_common *cl) | |
737 | { | |
738 | hlist_del(&cl->hnode); | |
739 | clhash->hashelems--; | |
740 | } | |
741 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
742 | ||
fa0f5aa7 ED |
743 | /* Allocate an unique handle from space managed by kernel |
744 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
745 | */ | |
1da177e4 LT |
746 | static u32 qdisc_alloc_handle(struct net_device *dev) |
747 | { | |
fa0f5aa7 | 748 | int i = 0x8000; |
1da177e4 LT |
749 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
750 | ||
751 | do { | |
752 | autohandle += TC_H_MAKE(0x10000U, 0); | |
753 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
754 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
755 | if (!qdisc_lookup(dev, autohandle)) |
756 | return autohandle; | |
757 | cond_resched(); | |
758 | } while (--i > 0); | |
1da177e4 | 759 | |
fa0f5aa7 | 760 | return 0; |
1da177e4 LT |
761 | } |
762 | ||
5f2939d9 | 763 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len) |
43effa1e | 764 | { |
fd5ac14a | 765 | bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED; |
20fea08b | 766 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
767 | unsigned long cl; |
768 | u32 parentid; | |
95946658 | 769 | bool notify; |
2c8c8e6f | 770 | int drops; |
43effa1e | 771 | |
2ccccf5f | 772 | if (n == 0 && len == 0) |
43effa1e | 773 | return; |
2c8c8e6f | 774 | drops = max_t(int, n, 0); |
4eaf3b84 | 775 | rcu_read_lock(); |
43effa1e | 776 | while ((parentid = sch->parent)) { |
066a3b5b | 777 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 778 | break; |
066a3b5b | 779 | |
4eaf3b84 ED |
780 | if (sch->flags & TCQ_F_NOPARENT) |
781 | break; | |
95946658 KK |
782 | /* Notify parent qdisc only if child qdisc becomes empty. |
783 | * | |
784 | * If child was empty even before update then backlog | |
785 | * counter is screwed and we skip notification because | |
786 | * parent class is already passive. | |
fd5ac14a NF |
787 | * |
788 | * If the original child was offloaded then it is allowed | |
789 | * to be seem as empty, so the parent is notified anyway. | |
95946658 | 790 | */ |
fd5ac14a NF |
791 | notify = !sch->q.qlen && !WARN_ON_ONCE(!n && |
792 | !qdisc_is_offloaded); | |
4eaf3b84 | 793 | /* TODO: perform the search on a per txq basis */ |
5ce2d488 | 794 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 795 | if (sch == NULL) { |
4eaf3b84 ED |
796 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
797 | break; | |
ffc8fefa | 798 | } |
43effa1e | 799 | cops = sch->ops->cl_ops; |
95946658 | 800 | if (notify && cops->qlen_notify) { |
143976ce | 801 | cl = cops->find(sch, parentid); |
43effa1e | 802 | cops->qlen_notify(sch, cl); |
43effa1e PM |
803 | } |
804 | sch->q.qlen -= n; | |
2ccccf5f | 805 | sch->qstats.backlog -= len; |
25331d6c | 806 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 807 | } |
4eaf3b84 | 808 | rcu_read_unlock(); |
43effa1e | 809 | } |
2ccccf5f | 810 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
1da177e4 | 811 | |
b592843c JK |
812 | int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type, |
813 | void *type_data) | |
814 | { | |
815 | struct net_device *dev = qdisc_dev(sch); | |
816 | int err; | |
817 | ||
818 | sch->flags &= ~TCQ_F_OFFLOADED; | |
819 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
820 | return 0; | |
821 | ||
822 | err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data); | |
823 | if (err == -EOPNOTSUPP) | |
824 | return 0; | |
825 | ||
826 | if (!err) | |
827 | sch->flags |= TCQ_F_OFFLOADED; | |
828 | ||
829 | return err; | |
830 | } | |
831 | EXPORT_SYMBOL(qdisc_offload_dump_helper); | |
832 | ||
bfaee911 JK |
833 | void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
834 | struct Qdisc *new, struct Qdisc *old, | |
835 | enum tc_setup_type type, void *type_data, | |
836 | struct netlink_ext_ack *extack) | |
837 | { | |
838 | bool any_qdisc_is_offloaded; | |
839 | int err; | |
840 | ||
841 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
842 | return; | |
843 | ||
844 | err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data); | |
845 | ||
846 | /* Don't report error if the graft is part of destroy operation. */ | |
847 | if (!err || !new || new == &noop_qdisc) | |
848 | return; | |
849 | ||
850 | /* Don't report error if the parent, the old child and the new | |
851 | * one are not offloaded. | |
852 | */ | |
853 | any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED; | |
854 | any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED; | |
855 | any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED; | |
856 | ||
857 | if (any_qdisc_is_offloaded) | |
858 | NL_SET_ERR_MSG(extack, "Offloading graft operation failed."); | |
859 | } | |
860 | EXPORT_SYMBOL(qdisc_offload_graft_helper); | |
861 | ||
98b0e5f6 JK |
862 | static void qdisc_offload_graft_root(struct net_device *dev, |
863 | struct Qdisc *new, struct Qdisc *old, | |
864 | struct netlink_ext_ack *extack) | |
865 | { | |
866 | struct tc_root_qopt_offload graft_offload = { | |
867 | .command = TC_ROOT_GRAFT, | |
868 | .handle = new ? new->handle : 0, | |
869 | .ingress = (new && new->flags & TCQ_F_INGRESS) || | |
870 | (old && old->flags & TCQ_F_INGRESS), | |
871 | }; | |
872 | ||
873 | qdisc_offload_graft_helper(dev, NULL, new, old, | |
874 | TC_SETUP_ROOT_QDISC, &graft_offload, extack); | |
875 | } | |
876 | ||
27d7f07c WC |
877 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, |
878 | u32 portid, u32 seq, u16 flags, int event) | |
879 | { | |
880 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; | |
881 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; | |
882 | struct tcmsg *tcm; | |
883 | struct nlmsghdr *nlh; | |
884 | unsigned char *b = skb_tail_pointer(skb); | |
885 | struct gnet_dump d; | |
886 | struct qdisc_size_table *stab; | |
d47a6b0e | 887 | u32 block_index; |
27d7f07c WC |
888 | __u32 qlen; |
889 | ||
890 | cond_resched(); | |
891 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
892 | if (!nlh) | |
893 | goto out_nlmsg_trim; | |
894 | tcm = nlmsg_data(nlh); | |
895 | tcm->tcm_family = AF_UNSPEC; | |
896 | tcm->tcm__pad1 = 0; | |
897 | tcm->tcm__pad2 = 0; | |
898 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
899 | tcm->tcm_parent = clid; | |
900 | tcm->tcm_handle = q->handle; | |
901 | tcm->tcm_info = refcount_read(&q->refcnt); | |
902 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
903 | goto nla_put_failure; | |
d47a6b0e JP |
904 | if (q->ops->ingress_block_get) { |
905 | block_index = q->ops->ingress_block_get(q); | |
906 | if (block_index && | |
907 | nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index)) | |
908 | goto nla_put_failure; | |
909 | } | |
910 | if (q->ops->egress_block_get) { | |
911 | block_index = q->ops->egress_block_get(q); | |
912 | if (block_index && | |
913 | nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index)) | |
914 | goto nla_put_failure; | |
915 | } | |
27d7f07c WC |
916 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
917 | goto nla_put_failure; | |
44edf2f8 NF |
918 | if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED))) |
919 | goto nla_put_failure; | |
7e66016f | 920 | qlen = qdisc_qlen_sum(q); |
27d7f07c WC |
921 | |
922 | stab = rtnl_dereference(q->stab); | |
923 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
924 | goto nla_put_failure; | |
925 | ||
926 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
927 | NULL, &d, TCA_PAD) < 0) | |
928 | goto nla_put_failure; | |
929 | ||
930 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
931 | goto nla_put_failure; | |
932 | ||
933 | if (qdisc_is_percpu_stats(q)) { | |
934 | cpu_bstats = q->cpu_bstats; | |
935 | cpu_qstats = q->cpu_qstats; | |
936 | } | |
937 | ||
938 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q), | |
939 | &d, cpu_bstats, &q->bstats) < 0 || | |
940 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || | |
941 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) | |
942 | goto nla_put_failure; | |
943 | ||
944 | if (gnet_stats_finish_copy(&d) < 0) | |
945 | goto nla_put_failure; | |
946 | ||
947 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
948 | return skb->len; | |
949 | ||
950 | out_nlmsg_trim: | |
951 | nla_put_failure: | |
952 | nlmsg_trim(skb, b); | |
953 | return -1; | |
954 | } | |
955 | ||
956 | static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible) | |
957 | { | |
958 | if (q->flags & TCQ_F_BUILTIN) | |
959 | return true; | |
960 | if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible) | |
961 | return true; | |
962 | ||
963 | return false; | |
964 | } | |
965 | ||
966 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, | |
967 | struct nlmsghdr *n, u32 clid, | |
968 | struct Qdisc *old, struct Qdisc *new) | |
969 | { | |
970 | struct sk_buff *skb; | |
971 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
972 | ||
973 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
974 | if (!skb) | |
975 | return -ENOBUFS; | |
976 | ||
977 | if (old && !tc_qdisc_dump_ignore(old, false)) { | |
978 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, | |
979 | 0, RTM_DELQDISC) < 0) | |
980 | goto err_out; | |
981 | } | |
982 | if (new && !tc_qdisc_dump_ignore(new, false)) { | |
983 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, | |
984 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
985 | goto err_out; | |
986 | } | |
987 | ||
988 | if (skb->len) | |
989 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
990 | n->nlmsg_flags & NLM_F_ECHO); | |
991 | ||
992 | err_out: | |
993 | kfree_skb(skb); | |
994 | return -EINVAL; | |
995 | } | |
996 | ||
7316ae88 TG |
997 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
998 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
999 | struct Qdisc *old, struct Qdisc *new) |
1000 | { | |
1001 | if (new || old) | |
7316ae88 | 1002 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 1003 | |
4d8863a2 | 1004 | if (old) |
86bd446b | 1005 | qdisc_put(old); |
99194cff DM |
1006 | } |
1007 | ||
8a53e616 PA |
1008 | static void qdisc_clear_nolock(struct Qdisc *sch) |
1009 | { | |
1010 | sch->flags &= ~TCQ_F_NOLOCK; | |
1011 | if (!(sch->flags & TCQ_F_CPUSTATS)) | |
1012 | return; | |
1013 | ||
1014 | free_percpu(sch->cpu_bstats); | |
1015 | free_percpu(sch->cpu_qstats); | |
1016 | sch->cpu_bstats = NULL; | |
1017 | sch->cpu_qstats = NULL; | |
1018 | sch->flags &= ~TCQ_F_CPUSTATS; | |
1019 | } | |
1020 | ||
99194cff DM |
1021 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or |
1022 | * to device "dev". | |
1023 | * | |
1024 | * When appropriate send a netlink notification using 'skb' | |
1025 | * and "n". | |
1026 | * | |
1027 | * On success, destroy old qdisc. | |
1da177e4 LT |
1028 | */ |
1029 | ||
1030 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff | 1031 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
09215598 AA |
1032 | struct Qdisc *new, struct Qdisc *old, |
1033 | struct netlink_ext_ack *extack) | |
1da177e4 | 1034 | { |
99194cff | 1035 | struct Qdisc *q = old; |
7316ae88 | 1036 | struct net *net = dev_net(dev); |
1da177e4 | 1037 | |
10297b99 | 1038 | if (parent == NULL) { |
99194cff DM |
1039 | unsigned int i, num_q, ingress; |
1040 | ||
1041 | ingress = 0; | |
1042 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
1043 | if ((q && q->flags & TCQ_F_INGRESS) || |
1044 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
1045 | num_q = 1; |
1046 | ingress = 1; | |
09215598 AA |
1047 | if (!dev_ingress_queue(dev)) { |
1048 | NL_SET_ERR_MSG(extack, "Device does not have an ingress queue"); | |
24824a09 | 1049 | return -ENOENT; |
09215598 | 1050 | } |
99194cff DM |
1051 | } |
1052 | ||
1053 | if (dev->flags & IFF_UP) | |
1054 | dev_deactivate(dev); | |
1055 | ||
98b0e5f6 JK |
1056 | qdisc_offload_graft_root(dev, new, old, extack); |
1057 | ||
86e363dc WC |
1058 | if (new && new->ops->attach) |
1059 | goto skip; | |
6ec1c69a | 1060 | |
99194cff | 1061 | for (i = 0; i < num_q; i++) { |
24824a09 | 1062 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
1063 | |
1064 | if (!ingress) | |
1065 | dev_queue = netdev_get_tx_queue(dev, i); | |
1066 | ||
8d50b53d DM |
1067 | old = dev_graft_qdisc(dev_queue, new); |
1068 | if (new && i > 0) | |
551143d8 | 1069 | qdisc_refcount_inc(new); |
8d50b53d | 1070 | |
036d6a67 | 1071 | if (!ingress) |
86bd446b | 1072 | qdisc_put(old); |
1da177e4 | 1073 | } |
99194cff | 1074 | |
86e363dc | 1075 | skip: |
036d6a67 | 1076 | if (!ingress) { |
7316ae88 TG |
1077 | notify_and_destroy(net, skb, n, classid, |
1078 | dev->qdisc, new); | |
036d6a67 | 1079 | if (new && !new->ops->attach) |
551143d8 | 1080 | qdisc_refcount_inc(new); |
036d6a67 | 1081 | dev->qdisc = new ? : &noop_qdisc; |
86e363dc WC |
1082 | |
1083 | if (new && new->ops->attach) | |
1084 | new->ops->attach(new); | |
036d6a67 | 1085 | } else { |
7316ae88 | 1086 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 1087 | } |
af356afa | 1088 | |
99194cff DM |
1089 | if (dev->flags & IFF_UP) |
1090 | dev_activate(dev); | |
1da177e4 | 1091 | } else { |
20fea08b | 1092 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
9da93ece JK |
1093 | unsigned long cl; |
1094 | int err; | |
1da177e4 | 1095 | |
c5ad119f | 1096 | /* Only support running class lockless if parent is lockless */ |
8eaf8d99 | 1097 | if (new && (new->flags & TCQ_F_NOLOCK) && !(parent->flags & TCQ_F_NOLOCK)) |
8a53e616 | 1098 | qdisc_clear_nolock(new); |
c5ad119f | 1099 | |
9da93ece JK |
1100 | if (!cops || !cops->graft) |
1101 | return -EOPNOTSUPP; | |
143976ce | 1102 | |
9da93ece JK |
1103 | cl = cops->find(parent, classid); |
1104 | if (!cl) { | |
1105 | NL_SET_ERR_MSG(extack, "Specified class not found"); | |
1106 | return -ENOENT; | |
1da177e4 | 1107 | } |
9da93ece JK |
1108 | |
1109 | err = cops->graft(parent, cl, new, &old, extack); | |
1110 | if (err) | |
1111 | return err; | |
1112 | notify_and_destroy(net, skb, n, classid, old, new); | |
1da177e4 | 1113 | } |
9da93ece | 1114 | return 0; |
1da177e4 LT |
1115 | } |
1116 | ||
d47a6b0e JP |
1117 | static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca, |
1118 | struct netlink_ext_ack *extack) | |
1119 | { | |
1120 | u32 block_index; | |
1121 | ||
1122 | if (tca[TCA_INGRESS_BLOCK]) { | |
1123 | block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]); | |
1124 | ||
1125 | if (!block_index) { | |
1126 | NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0"); | |
1127 | return -EINVAL; | |
1128 | } | |
1129 | if (!sch->ops->ingress_block_set) { | |
1130 | NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported"); | |
1131 | return -EOPNOTSUPP; | |
1132 | } | |
1133 | sch->ops->ingress_block_set(sch, block_index); | |
1134 | } | |
1135 | if (tca[TCA_EGRESS_BLOCK]) { | |
1136 | block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]); | |
1137 | ||
1138 | if (!block_index) { | |
1139 | NL_SET_ERR_MSG(extack, "Egress block index cannot be 0"); | |
1140 | return -EINVAL; | |
1141 | } | |
1142 | if (!sch->ops->egress_block_set) { | |
1143 | NL_SET_ERR_MSG(extack, "Egress block sharing is not supported"); | |
1144 | return -EOPNOTSUPP; | |
1145 | } | |
1146 | sch->ops->egress_block_set(sch, block_index); | |
1147 | } | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1da177e4 LT |
1151 | /* |
1152 | Allocate and initialize new qdisc. | |
1153 | ||
1154 | Parameters are passed via opt. | |
1155 | */ | |
1156 | ||
5a7a5555 JHS |
1157 | static struct Qdisc *qdisc_create(struct net_device *dev, |
1158 | struct netdev_queue *dev_queue, | |
1159 | struct Qdisc *p, u32 parent, u32 handle, | |
09215598 AA |
1160 | struct nlattr **tca, int *errp, |
1161 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1162 | { |
1163 | int err; | |
1e90474c | 1164 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
1165 | struct Qdisc *sch; |
1166 | struct Qdisc_ops *ops; | |
175f9c1b | 1167 | struct qdisc_size_table *stab; |
1da177e4 LT |
1168 | |
1169 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 1170 | #ifdef CONFIG_MODULES |
1da177e4 LT |
1171 | if (ops == NULL && kind != NULL) { |
1172 | char name[IFNAMSIZ]; | |
872f6903 | 1173 | if (nla_strscpy(name, kind, IFNAMSIZ) >= 0) { |
1da177e4 LT |
1174 | /* We dropped the RTNL semaphore in order to |
1175 | * perform the module load. So, even if we | |
1176 | * succeeded in loading the module we have to | |
1177 | * tell the caller to replay the request. We | |
1178 | * indicate this using -EAGAIN. | |
1179 | * We replay the request because the device may | |
1180 | * go away in the mean time. | |
1181 | */ | |
1182 | rtnl_unlock(); | |
1183 | request_module("sch_%s", name); | |
1184 | rtnl_lock(); | |
1185 | ops = qdisc_lookup_ops(kind); | |
1186 | if (ops != NULL) { | |
1187 | /* We will try again qdisc_lookup_ops, | |
1188 | * so don't keep a reference. | |
1189 | */ | |
1190 | module_put(ops->owner); | |
1191 | err = -EAGAIN; | |
1192 | goto err_out; | |
1193 | } | |
1194 | } | |
1195 | } | |
1196 | #endif | |
1197 | ||
b9e2cc0f | 1198 | err = -ENOENT; |
09215598 AA |
1199 | if (!ops) { |
1200 | NL_SET_ERR_MSG(extack, "Specified qdisc not found"); | |
1da177e4 | 1201 | goto err_out; |
09215598 | 1202 | } |
1da177e4 | 1203 | |
d0bd684d | 1204 | sch = qdisc_alloc(dev_queue, ops, extack); |
3d54b82f TG |
1205 | if (IS_ERR(sch)) { |
1206 | err = PTR_ERR(sch); | |
1da177e4 | 1207 | goto err_out2; |
3d54b82f | 1208 | } |
1da177e4 | 1209 | |
ffc8fefa PM |
1210 | sch->parent = parent; |
1211 | ||
3d54b82f | 1212 | if (handle == TC_H_INGRESS) { |
1da177e4 | 1213 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 1214 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
fd44de7c | 1215 | } else { |
fd44de7c PM |
1216 | if (handle == 0) { |
1217 | handle = qdisc_alloc_handle(dev); | |
aaeb1dea IV |
1218 | if (handle == 0) { |
1219 | NL_SET_ERR_MSG(extack, "Maximum number of qdisc handles was exceeded"); | |
1220 | err = -ENOSPC; | |
fd44de7c | 1221 | goto err_out3; |
aaeb1dea | 1222 | } |
fd44de7c | 1223 | } |
1abbe139 | 1224 | if (!netif_is_multiqueue(dev)) |
225734de | 1225 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
1226 | } |
1227 | ||
3d54b82f | 1228 | sch->handle = handle; |
1da177e4 | 1229 | |
84c46dd8 JDB |
1230 | /* This exist to keep backward compatible with a userspace |
1231 | * loophole, what allowed userspace to get IFF_NO_QUEUE | |
1232 | * facility on older kernels by setting tx_queue_len=0 (prior | |
1233 | * to qdisc init), and then forgot to reinit tx_queue_len | |
1234 | * before again attaching a qdisc. | |
1235 | */ | |
1236 | if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { | |
1237 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; | |
1238 | netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); | |
1239 | } | |
1240 | ||
d47a6b0e JP |
1241 | err = qdisc_block_indexes_set(sch, tca, extack); |
1242 | if (err) | |
1243 | goto err_out3; | |
1244 | ||
54160ef6 | 1245 | if (ops->init) { |
e63d7dfd | 1246 | err = ops->init(sch, tca[TCA_OPTIONS], extack); |
54160ef6 AA |
1247 | if (err != 0) |
1248 | goto err_out5; | |
1249 | } | |
22e0f8b9 | 1250 | |
54160ef6 | 1251 | if (tca[TCA_STAB]) { |
09215598 | 1252 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
54160ef6 AA |
1253 | if (IS_ERR(stab)) { |
1254 | err = PTR_ERR(stab); | |
1255 | goto err_out4; | |
023e09a7 | 1256 | } |
54160ef6 AA |
1257 | rcu_assign_pointer(sch->stab, stab); |
1258 | } | |
1259 | if (tca[TCA_RATE]) { | |
1260 | seqcount_t *running; | |
f6e0b239 | 1261 | |
54160ef6 | 1262 | err = -EOPNOTSUPP; |
09215598 AA |
1263 | if (sch->flags & TCQ_F_MQROOT) { |
1264 | NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc"); | |
54160ef6 | 1265 | goto err_out4; |
09215598 | 1266 | } |
1da177e4 | 1267 | |
54160ef6 AA |
1268 | if (sch->parent != TC_H_ROOT && |
1269 | !(sch->flags & TCQ_F_INGRESS) && | |
1270 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
1271 | running = qdisc_root_sleeping_running(sch); | |
1272 | else | |
1273 | running = &sch->running; | |
1274 | ||
1275 | err = gen_new_estimator(&sch->bstats, | |
1276 | sch->cpu_bstats, | |
1277 | &sch->rate_est, | |
1278 | NULL, | |
1279 | running, | |
1280 | tca[TCA_RATE]); | |
09215598 AA |
1281 | if (err) { |
1282 | NL_SET_ERR_MSG(extack, "Failed to generate new estimator"); | |
54160ef6 | 1283 | goto err_out4; |
09215598 | 1284 | } |
1da177e4 | 1285 | } |
54160ef6 AA |
1286 | |
1287 | qdisc_hash_add(sch, false); | |
f5a7833e | 1288 | trace_qdisc_create(ops, dev, parent); |
54160ef6 AA |
1289 | |
1290 | return sch; | |
1291 | ||
1292 | err_out5: | |
87b60cfa | 1293 | /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ |
c1a4872e GF |
1294 | if (ops->destroy) |
1295 | ops->destroy(sch); | |
1da177e4 LT |
1296 | err_out3: |
1297 | dev_put(dev); | |
81d947e2 | 1298 | qdisc_free(sch); |
1da177e4 LT |
1299 | err_out2: |
1300 | module_put(ops->owner); | |
1301 | err_out: | |
1302 | *errp = err; | |
1da177e4 | 1303 | return NULL; |
23bcf634 PM |
1304 | |
1305 | err_out4: | |
1306 | /* | |
1307 | * Any broken qdiscs that would require a ops->reset() here? | |
1308 | * The qdisc was never in action so it shouldn't be necessary. | |
1309 | */ | |
a2da570d | 1310 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1311 | if (ops->destroy) |
1312 | ops->destroy(sch); | |
1313 | goto err_out3; | |
1da177e4 LT |
1314 | } |
1315 | ||
09215598 AA |
1316 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca, |
1317 | struct netlink_ext_ack *extack) | |
1da177e4 | 1318 | { |
a2da570d | 1319 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1320 | int err = 0; |
1da177e4 | 1321 | |
175f9c1b | 1322 | if (tca[TCA_OPTIONS]) { |
09215598 AA |
1323 | if (!sch->ops->change) { |
1324 | NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc"); | |
1da177e4 | 1325 | return -EINVAL; |
09215598 | 1326 | } |
d47a6b0e JP |
1327 | if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) { |
1328 | NL_SET_ERR_MSG(extack, "Change of blocks is not supported"); | |
1329 | return -EOPNOTSUPP; | |
1330 | } | |
2030721c | 1331 | err = sch->ops->change(sch, tca[TCA_OPTIONS], extack); |
1da177e4 LT |
1332 | if (err) |
1333 | return err; | |
1334 | } | |
175f9c1b JK |
1335 | |
1336 | if (tca[TCA_STAB]) { | |
09215598 | 1337 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
175f9c1b JK |
1338 | if (IS_ERR(stab)) |
1339 | return PTR_ERR(stab); | |
1340 | } | |
1341 | ||
a2da570d ED |
1342 | ostab = rtnl_dereference(sch->stab); |
1343 | rcu_assign_pointer(sch->stab, stab); | |
1344 | qdisc_put_stab(ostab); | |
175f9c1b | 1345 | |
23bcf634 | 1346 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1347 | /* NB: ignores errors from replace_estimator |
1348 | because change can't be undone. */ | |
23bcf634 PM |
1349 | if (sch->flags & TCQ_F_MQROOT) |
1350 | goto out; | |
22e0f8b9 JF |
1351 | gen_replace_estimator(&sch->bstats, |
1352 | sch->cpu_bstats, | |
1353 | &sch->rate_est, | |
edb09eb1 ED |
1354 | NULL, |
1355 | qdisc_root_sleeping_running(sch), | |
22e0f8b9 | 1356 | tca[TCA_RATE]); |
23bcf634 PM |
1357 | } |
1358 | out: | |
1da177e4 LT |
1359 | return 0; |
1360 | } | |
1361 | ||
cc7ec456 ED |
1362 | struct check_loop_arg { |
1363 | struct qdisc_walker w; | |
1da177e4 LT |
1364 | struct Qdisc *p; |
1365 | int depth; | |
1366 | }; | |
1367 | ||
5a7a5555 JHS |
1368 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, |
1369 | struct qdisc_walker *w); | |
1da177e4 LT |
1370 | |
1371 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1372 | { | |
1373 | struct check_loop_arg arg; | |
1374 | ||
1375 | if (q->ops->cl_ops == NULL) | |
1376 | return 0; | |
1377 | ||
1378 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1379 | arg.w.fn = check_loop_fn; | |
1380 | arg.depth = depth; | |
1381 | arg.p = p; | |
1382 | q->ops->cl_ops->walk(q, &arg.w); | |
1383 | return arg.w.stop ? -ELOOP : 0; | |
1384 | } | |
1385 | ||
1386 | static int | |
1387 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1388 | { | |
1389 | struct Qdisc *leaf; | |
20fea08b | 1390 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1391 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1392 | ||
1393 | leaf = cops->leaf(q, cl); | |
1394 | if (leaf) { | |
1395 | if (leaf == arg->p || arg->depth > 7) | |
1396 | return -ELOOP; | |
1397 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1398 | } | |
1399 | return 0; | |
1400 | } | |
1401 | ||
8b4c3cdd | 1402 | const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = { |
6f96c3c6 | 1403 | [TCA_KIND] = { .type = NLA_STRING }, |
8b4c3cdd DA |
1404 | [TCA_RATE] = { .type = NLA_BINARY, |
1405 | .len = sizeof(struct tc_estimator) }, | |
1406 | [TCA_STAB] = { .type = NLA_NESTED }, | |
1407 | [TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG }, | |
1408 | [TCA_CHAIN] = { .type = NLA_U32 }, | |
1409 | [TCA_INGRESS_BLOCK] = { .type = NLA_U32 }, | |
1410 | [TCA_EGRESS_BLOCK] = { .type = NLA_U32 }, | |
1411 | }; | |
1412 | ||
e331473f DC |
1413 | /* |
1414 | * Delete/get qdisc. | |
1415 | */ | |
1416 | ||
c21ef3e3 DA |
1417 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1418 | struct netlink_ext_ack *extack) | |
1da177e4 | 1419 | { |
3b1e0a65 | 1420 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1421 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1422 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1423 | struct net_device *dev; |
de179c8c | 1424 | u32 clid; |
1da177e4 LT |
1425 | struct Qdisc *q = NULL; |
1426 | struct Qdisc *p = NULL; | |
1427 | int err; | |
1428 | ||
4e8bbb81 | 1429 | if ((n->nlmsg_type != RTM_GETQDISC) && |
5f013c9b | 1430 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1431 | return -EPERM; |
1432 | ||
8cb08174 JB |
1433 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1434 | rtm_tca_policy, extack); | |
1e90474c PM |
1435 | if (err < 0) |
1436 | return err; | |
1437 | ||
de179c8c H |
1438 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1439 | if (!dev) | |
1440 | return -ENODEV; | |
1441 | ||
1442 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1443 | if (clid) { |
1444 | if (clid != TC_H_ROOT) { | |
1445 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 | 1446 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1447 | if (!p) { |
1448 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid"); | |
1da177e4 | 1449 | return -ENOENT; |
09215598 | 1450 | } |
1da177e4 | 1451 | q = qdisc_leaf(p, clid); |
cc7ec456 ED |
1452 | } else if (dev_ingress_queue(dev)) { |
1453 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1454 | } |
1da177e4 | 1455 | } else { |
af356afa | 1456 | q = dev->qdisc; |
1da177e4 | 1457 | } |
09215598 AA |
1458 | if (!q) { |
1459 | NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device"); | |
1da177e4 | 1460 | return -ENOENT; |
09215598 | 1461 | } |
1da177e4 | 1462 | |
09215598 AA |
1463 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) { |
1464 | NL_SET_ERR_MSG(extack, "Invalid handle"); | |
1da177e4 | 1465 | return -EINVAL; |
09215598 | 1466 | } |
1da177e4 | 1467 | } else { |
cc7ec456 | 1468 | q = qdisc_lookup(dev, tcm->tcm_handle); |
09215598 AA |
1469 | if (!q) { |
1470 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle"); | |
1da177e4 | 1471 | return -ENOENT; |
09215598 | 1472 | } |
1da177e4 LT |
1473 | } |
1474 | ||
09215598 AA |
1475 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1476 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1477 | return -EINVAL; |
09215598 | 1478 | } |
1da177e4 LT |
1479 | |
1480 | if (n->nlmsg_type == RTM_DELQDISC) { | |
09215598 AA |
1481 | if (!clid) { |
1482 | NL_SET_ERR_MSG(extack, "Classid cannot be zero"); | |
1da177e4 | 1483 | return -EINVAL; |
09215598 AA |
1484 | } |
1485 | if (q->handle == 0) { | |
1486 | NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero"); | |
1da177e4 | 1487 | return -ENOENT; |
09215598 AA |
1488 | } |
1489 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack); | |
cc7ec456 | 1490 | if (err != 0) |
1da177e4 | 1491 | return err; |
1da177e4 | 1492 | } else { |
7316ae88 | 1493 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1494 | } |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | /* | |
cc7ec456 | 1499 | * Create/change qdisc. |
1da177e4 LT |
1500 | */ |
1501 | ||
c21ef3e3 DA |
1502 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1503 | struct netlink_ext_ack *extack) | |
1da177e4 | 1504 | { |
3b1e0a65 | 1505 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1506 | struct tcmsg *tcm; |
1e90474c | 1507 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1508 | struct net_device *dev; |
1509 | u32 clid; | |
1510 | struct Qdisc *q, *p; | |
1511 | int err; | |
1512 | ||
5f013c9b | 1513 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1514 | return -EPERM; |
1515 | ||
1da177e4 LT |
1516 | replay: |
1517 | /* Reinit, just in case something touches this. */ | |
8cb08174 JB |
1518 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1519 | rtm_tca_policy, extack); | |
de179c8c H |
1520 | if (err < 0) |
1521 | return err; | |
1522 | ||
02ef22ca | 1523 | tcm = nlmsg_data(n); |
1da177e4 LT |
1524 | clid = tcm->tcm_parent; |
1525 | q = p = NULL; | |
1526 | ||
cc7ec456 ED |
1527 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1528 | if (!dev) | |
1da177e4 LT |
1529 | return -ENODEV; |
1530 | ||
1e90474c | 1531 | |
1da177e4 LT |
1532 | if (clid) { |
1533 | if (clid != TC_H_ROOT) { | |
1534 | if (clid != TC_H_INGRESS) { | |
cc7ec456 | 1535 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1536 | if (!p) { |
1537 | NL_SET_ERR_MSG(extack, "Failed to find specified qdisc"); | |
1da177e4 | 1538 | return -ENOENT; |
09215598 | 1539 | } |
1da177e4 | 1540 | q = qdisc_leaf(p, clid); |
cc7ec456 ED |
1541 | } else if (dev_ingress_queue_create(dev)) { |
1542 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1543 | } |
1544 | } else { | |
af356afa | 1545 | q = dev->qdisc; |
1da177e4 LT |
1546 | } |
1547 | ||
1548 | /* It may be default qdisc, ignore it */ | |
1549 | if (q && q->handle == 0) | |
1550 | q = NULL; | |
1551 | ||
1552 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1553 | if (tcm->tcm_handle) { | |
09215598 AA |
1554 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) { |
1555 | NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override"); | |
1da177e4 | 1556 | return -EEXIST; |
09215598 AA |
1557 | } |
1558 | if (TC_H_MIN(tcm->tcm_handle)) { | |
1559 | NL_SET_ERR_MSG(extack, "Invalid minor handle"); | |
1da177e4 | 1560 | return -EINVAL; |
09215598 | 1561 | } |
cc7ec456 | 1562 | q = qdisc_lookup(dev, tcm->tcm_handle); |
8ec69574 | 1563 | if (!q) |
1da177e4 | 1564 | goto create_n_graft; |
09215598 AA |
1565 | if (n->nlmsg_flags & NLM_F_EXCL) { |
1566 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override"); | |
1da177e4 | 1567 | return -EEXIST; |
09215598 | 1568 | } |
0ac4bd68 | 1569 | if (tca[TCA_KIND] && |
09215598 AA |
1570 | nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1571 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1572 | return -EINVAL; |
09215598 | 1573 | } |
1da177e4 | 1574 | if (q == p || |
09215598 AA |
1575 | (p && check_loop(q, p, 0))) { |
1576 | NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected"); | |
1da177e4 | 1577 | return -ELOOP; |
09215598 | 1578 | } |
551143d8 | 1579 | qdisc_refcount_inc(q); |
1da177e4 LT |
1580 | goto graft; |
1581 | } else { | |
cc7ec456 | 1582 | if (!q) |
1da177e4 LT |
1583 | goto create_n_graft; |
1584 | ||
1585 | /* This magic test requires explanation. | |
1586 | * | |
1587 | * We know, that some child q is already | |
1588 | * attached to this parent and have choice: | |
1589 | * either to change it or to create/graft new one. | |
1590 | * | |
1591 | * 1. We are allowed to create/graft only | |
1592 | * if CREATE and REPLACE flags are set. | |
1593 | * | |
1594 | * 2. If EXCL is set, requestor wanted to say, | |
1595 | * that qdisc tcm_handle is not expected | |
1596 | * to exist, so that we choose create/graft too. | |
1597 | * | |
1598 | * 3. The last case is when no flags are set. | |
1599 | * Alas, it is sort of hole in API, we | |
1600 | * cannot decide what to do unambiguously. | |
1601 | * For now we select create/graft, if | |
1602 | * user gave KIND, which does not match existing. | |
1603 | */ | |
cc7ec456 ED |
1604 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1605 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1606 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1607 | (tca[TCA_KIND] && |
1608 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1609 | goto create_n_graft; |
1610 | } | |
1611 | } | |
1612 | } else { | |
09215598 AA |
1613 | if (!tcm->tcm_handle) { |
1614 | NL_SET_ERR_MSG(extack, "Handle cannot be zero"); | |
1da177e4 | 1615 | return -EINVAL; |
09215598 | 1616 | } |
1da177e4 LT |
1617 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1618 | } | |
1619 | ||
1620 | /* Change qdisc parameters */ | |
09215598 AA |
1621 | if (!q) { |
1622 | NL_SET_ERR_MSG(extack, "Specified qdisc not found"); | |
1da177e4 | 1623 | return -ENOENT; |
09215598 AA |
1624 | } |
1625 | if (n->nlmsg_flags & NLM_F_EXCL) { | |
1626 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify"); | |
1da177e4 | 1627 | return -EEXIST; |
09215598 AA |
1628 | } |
1629 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { | |
1630 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1631 | return -EINVAL; |
09215598 AA |
1632 | } |
1633 | err = qdisc_change(q, tca, extack); | |
1da177e4 | 1634 | if (err == 0) |
7316ae88 | 1635 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1636 | return err; |
1637 | ||
1638 | create_n_graft: | |
09215598 AA |
1639 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
1640 | NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag"); | |
1da177e4 | 1641 | return -ENOENT; |
09215598 | 1642 | } |
24824a09 | 1643 | if (clid == TC_H_INGRESS) { |
09215598 | 1644 | if (dev_ingress_queue(dev)) { |
24824a09 ED |
1645 | q = qdisc_create(dev, dev_ingress_queue(dev), p, |
1646 | tcm->tcm_parent, tcm->tcm_parent, | |
09215598 AA |
1647 | tca, &err, extack); |
1648 | } else { | |
1649 | NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device"); | |
24824a09 | 1650 | err = -ENOENT; |
09215598 | 1651 | } |
24824a09 | 1652 | } else { |
926e61b7 | 1653 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1654 | |
1655 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1656 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1657 | else if (p) | |
1658 | dev_queue = p->dev_queue; | |
1659 | else | |
1660 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1661 | |
926e61b7 | 1662 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1663 | tcm->tcm_parent, tcm->tcm_handle, |
09215598 | 1664 | tca, &err, extack); |
6ec1c69a | 1665 | } |
1da177e4 LT |
1666 | if (q == NULL) { |
1667 | if (err == -EAGAIN) | |
1668 | goto replay; | |
1669 | return err; | |
1670 | } | |
1671 | ||
1672 | graft: | |
09215598 | 1673 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack); |
e5befbd9 IJ |
1674 | if (err) { |
1675 | if (q) | |
86bd446b | 1676 | qdisc_put(q); |
e5befbd9 | 1677 | return err; |
1da177e4 | 1678 | } |
e5befbd9 | 1679 | |
1da177e4 LT |
1680 | return 0; |
1681 | } | |
1682 | ||
30723673 DM |
1683 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1684 | struct netlink_callback *cb, | |
49b49971 JK |
1685 | int *q_idx_p, int s_q_idx, bool recur, |
1686 | bool dump_invisible) | |
30723673 DM |
1687 | { |
1688 | int ret = 0, q_idx = *q_idx_p; | |
1689 | struct Qdisc *q; | |
59cc1f61 | 1690 | int b; |
30723673 DM |
1691 | |
1692 | if (!root) | |
1693 | return 0; | |
1694 | ||
1695 | q = root; | |
1696 | if (q_idx < s_q_idx) { | |
1697 | q_idx++; | |
1698 | } else { | |
49b49971 | 1699 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1700 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1701 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1702 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1703 | goto done; |
1704 | q_idx++; | |
1705 | } | |
69012ae4 | 1706 | |
ea327469 JK |
1707 | /* If dumping singletons, there is no qdisc_dev(root) and the singleton |
1708 | * itself has already been dumped. | |
1709 | * | |
1710 | * If we've already dumped the top-level (ingress) qdisc above and the global | |
1711 | * qdisc hashtable, we don't want to hit it again | |
1712 | */ | |
1713 | if (!qdisc_dev(root) || !recur) | |
69012ae4 JK |
1714 | goto out; |
1715 | ||
59cc1f61 | 1716 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1717 | if (q_idx < s_q_idx) { |
1718 | q_idx++; | |
1719 | continue; | |
1720 | } | |
49b49971 | 1721 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1722 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1723 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1724 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1725 | goto done; |
1726 | q_idx++; | |
1727 | } | |
1728 | ||
1729 | out: | |
1730 | *q_idx_p = q_idx; | |
1731 | return ret; | |
1732 | done: | |
1733 | ret = -1; | |
1734 | goto out; | |
1735 | } | |
1736 | ||
1da177e4 LT |
1737 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1738 | { | |
3b1e0a65 | 1739 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1740 | int idx, q_idx; |
1741 | int s_idx, s_q_idx; | |
1742 | struct net_device *dev; | |
49b49971 | 1743 | const struct nlmsghdr *nlh = cb->nlh; |
49b49971 JK |
1744 | struct nlattr *tca[TCA_MAX + 1]; |
1745 | int err; | |
1da177e4 LT |
1746 | |
1747 | s_idx = cb->args[0]; | |
1748 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1749 | |
7562f876 | 1750 | idx = 0; |
15dc36eb | 1751 | ASSERT_RTNL(); |
49b49971 | 1752 | |
8cb08174 JB |
1753 | err = nlmsg_parse_deprecated(nlh, sizeof(struct tcmsg), tca, TCA_MAX, |
1754 | rtm_tca_policy, cb->extack); | |
49b49971 JK |
1755 | if (err < 0) |
1756 | return err; | |
1757 | ||
15dc36eb | 1758 | for_each_netdev(net, dev) { |
30723673 DM |
1759 | struct netdev_queue *dev_queue; |
1760 | ||
1da177e4 | 1761 | if (idx < s_idx) |
7562f876 | 1762 | goto cont; |
1da177e4 LT |
1763 | if (idx > s_idx) |
1764 | s_q_idx = 0; | |
1da177e4 | 1765 | q_idx = 0; |
30723673 | 1766 | |
5a7a5555 | 1767 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx, |
49b49971 | 1768 | true, tca[TCA_DUMP_INVISIBLE]) < 0) |
30723673 DM |
1769 | goto done; |
1770 | ||
24824a09 ED |
1771 | dev_queue = dev_ingress_queue(dev); |
1772 | if (dev_queue && | |
1773 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
49b49971 JK |
1774 | &q_idx, s_q_idx, false, |
1775 | tca[TCA_DUMP_INVISIBLE]) < 0) | |
30723673 DM |
1776 | goto done; |
1777 | ||
7562f876 PE |
1778 | cont: |
1779 | idx++; | |
1da177e4 LT |
1780 | } |
1781 | ||
1782 | done: | |
1da177e4 LT |
1783 | cb->args[0] = idx; |
1784 | cb->args[1] = q_idx; | |
1785 | ||
1786 | return skb->len; | |
1787 | } | |
1788 | ||
1789 | ||
1790 | ||
1791 | /************************************************ | |
1792 | * Traffic classes manipulation. * | |
1793 | ************************************************/ | |
1794 | ||
27d7f07c WC |
1795 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, |
1796 | unsigned long cl, | |
1797 | u32 portid, u32 seq, u16 flags, int event) | |
1798 | { | |
1799 | struct tcmsg *tcm; | |
1800 | struct nlmsghdr *nlh; | |
1801 | unsigned char *b = skb_tail_pointer(skb); | |
1802 | struct gnet_dump d; | |
1803 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; | |
1da177e4 | 1804 | |
27d7f07c WC |
1805 | cond_resched(); |
1806 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1807 | if (!nlh) | |
1808 | goto out_nlmsg_trim; | |
1809 | tcm = nlmsg_data(nlh); | |
1810 | tcm->tcm_family = AF_UNSPEC; | |
1811 | tcm->tcm__pad1 = 0; | |
1812 | tcm->tcm__pad2 = 0; | |
1813 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1814 | tcm->tcm_parent = q->handle; | |
1815 | tcm->tcm_handle = q->handle; | |
1816 | tcm->tcm_info = 0; | |
1817 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
1818 | goto nla_put_failure; | |
1819 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) | |
1820 | goto nla_put_failure; | |
1821 | ||
1822 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
1823 | NULL, &d, TCA_PAD) < 0) | |
1824 | goto nla_put_failure; | |
1825 | ||
1826 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1827 | goto nla_put_failure; | |
1828 | ||
1829 | if (gnet_stats_finish_copy(&d) < 0) | |
1830 | goto nla_put_failure; | |
1831 | ||
1832 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1833 | return skb->len; | |
1834 | ||
1835 | out_nlmsg_trim: | |
1836 | nla_put_failure: | |
1837 | nlmsg_trim(skb, b); | |
1838 | return -1; | |
1839 | } | |
1840 | ||
1841 | static int tclass_notify(struct net *net, struct sk_buff *oskb, | |
1842 | struct nlmsghdr *n, struct Qdisc *q, | |
1843 | unsigned long cl, int event) | |
1844 | { | |
1845 | struct sk_buff *skb; | |
1846 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
5b5f99b1 | 1847 | int err = 0; |
27d7f07c WC |
1848 | |
1849 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1850 | if (!skb) | |
1851 | return -ENOBUFS; | |
1852 | ||
1853 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { | |
1854 | kfree_skb(skb); | |
1855 | return -EINVAL; | |
1856 | } | |
1857 | ||
5b5f99b1 ZW |
1858 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1859 | n->nlmsg_flags & NLM_F_ECHO); | |
1860 | if (err > 0) | |
1861 | err = 0; | |
1862 | return err; | |
27d7f07c | 1863 | } |
1da177e4 | 1864 | |
14546ba1 WC |
1865 | static int tclass_del_notify(struct net *net, |
1866 | const struct Qdisc_class_ops *cops, | |
1867 | struct sk_buff *oskb, struct nlmsghdr *n, | |
1868 | struct Qdisc *q, unsigned long cl) | |
1869 | { | |
1870 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1871 | struct sk_buff *skb; | |
1872 | int err = 0; | |
1873 | ||
1874 | if (!cops->delete) | |
1875 | return -EOPNOTSUPP; | |
1876 | ||
1877 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1878 | if (!skb) | |
1879 | return -ENOBUFS; | |
1880 | ||
1881 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, | |
1882 | RTM_DELTCLASS) < 0) { | |
1883 | kfree_skb(skb); | |
1884 | return -EINVAL; | |
1885 | } | |
1886 | ||
1887 | err = cops->delete(q, cl); | |
1888 | if (err) { | |
1889 | kfree_skb(skb); | |
1890 | return err; | |
1891 | } | |
1892 | ||
5b5f99b1 ZW |
1893 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1894 | n->nlmsg_flags & NLM_F_ECHO); | |
1895 | if (err > 0) | |
1896 | err = 0; | |
1897 | return err; | |
14546ba1 WC |
1898 | } |
1899 | ||
07d79fc7 CW |
1900 | #ifdef CONFIG_NET_CLS |
1901 | ||
1902 | struct tcf_bind_args { | |
1903 | struct tcf_walker w; | |
2e24cd75 | 1904 | unsigned long base; |
07d79fc7 | 1905 | unsigned long cl; |
2e24cd75 | 1906 | u32 classid; |
07d79fc7 CW |
1907 | }; |
1908 | ||
1909 | static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg) | |
1910 | { | |
1911 | struct tcf_bind_args *a = (void *)arg; | |
1912 | ||
1913 | if (tp->ops->bind_class) { | |
74e3be60 JP |
1914 | struct Qdisc *q = tcf_block_q(tp->chain->block); |
1915 | ||
1916 | sch_tree_lock(q); | |
2e24cd75 | 1917 | tp->ops->bind_class(n, a->classid, a->cl, q, a->base); |
74e3be60 | 1918 | sch_tree_unlock(q); |
07d79fc7 CW |
1919 | } |
1920 | return 0; | |
1921 | } | |
1922 | ||
760d228e CW |
1923 | struct tc_bind_class_args { |
1924 | struct qdisc_walker w; | |
1925 | unsigned long new_cl; | |
1926 | u32 portid; | |
1927 | u32 clid; | |
1928 | }; | |
1929 | ||
1930 | static int tc_bind_class_walker(struct Qdisc *q, unsigned long cl, | |
1931 | struct qdisc_walker *w) | |
07d79fc7 | 1932 | { |
760d228e | 1933 | struct tc_bind_class_args *a = (struct tc_bind_class_args *)w; |
07d79fc7 CW |
1934 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1935 | struct tcf_block *block; | |
1936 | struct tcf_chain *chain; | |
07d79fc7 | 1937 | |
cbaacc4e | 1938 | block = cops->tcf_block(q, cl, NULL); |
07d79fc7 | 1939 | if (!block) |
760d228e | 1940 | return 0; |
bbf73830 VB |
1941 | for (chain = tcf_get_next_chain(block, NULL); |
1942 | chain; | |
1943 | chain = tcf_get_next_chain(block, chain)) { | |
07d79fc7 CW |
1944 | struct tcf_proto *tp; |
1945 | ||
0fca55ed VB |
1946 | for (tp = tcf_get_next_proto(chain, NULL); |
1947 | tp; tp = tcf_get_next_proto(chain, tp)) { | |
07d79fc7 CW |
1948 | struct tcf_bind_args arg = {}; |
1949 | ||
1950 | arg.w.fn = tcf_node_bind; | |
760d228e | 1951 | arg.classid = a->clid; |
2e24cd75 | 1952 | arg.base = cl; |
760d228e | 1953 | arg.cl = a->new_cl; |
12db03b6 | 1954 | tp->ops->walk(tp, &arg.w, true); |
07d79fc7 CW |
1955 | } |
1956 | } | |
760d228e CW |
1957 | |
1958 | return 0; | |
1959 | } | |
1960 | ||
1961 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
1962 | unsigned long new_cl) | |
1963 | { | |
1964 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1965 | struct tc_bind_class_args args = {}; | |
1966 | ||
1967 | if (!cops->tcf_block) | |
1968 | return; | |
1969 | args.portid = portid; | |
1970 | args.clid = clid; | |
1971 | args.new_cl = new_cl; | |
1972 | args.w.fn = tc_bind_class_walker; | |
1973 | q->ops->cl_ops->walk(q, &args.w); | |
07d79fc7 CW |
1974 | } |
1975 | ||
1976 | #else | |
1977 | ||
1978 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
1979 | unsigned long new_cl) | |
1980 | { | |
1981 | } | |
1982 | ||
1983 | #endif | |
1984 | ||
c21ef3e3 DA |
1985 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, |
1986 | struct netlink_ext_ack *extack) | |
1da177e4 | 1987 | { |
3b1e0a65 | 1988 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1989 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1990 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1991 | struct net_device *dev; |
1992 | struct Qdisc *q = NULL; | |
20fea08b | 1993 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1994 | unsigned long cl = 0; |
1995 | unsigned long new_cl; | |
de179c8c H |
1996 | u32 portid; |
1997 | u32 clid; | |
1998 | u32 qid; | |
1da177e4 LT |
1999 | int err; |
2000 | ||
4e8bbb81 | 2001 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
5f013c9b | 2002 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
2003 | return -EPERM; |
2004 | ||
8cb08174 JB |
2005 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
2006 | rtm_tca_policy, extack); | |
1e90474c PM |
2007 | if (err < 0) |
2008 | return err; | |
2009 | ||
de179c8c H |
2010 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
2011 | if (!dev) | |
2012 | return -ENODEV; | |
2013 | ||
1da177e4 LT |
2014 | /* |
2015 | parent == TC_H_UNSPEC - unspecified parent. | |
2016 | parent == TC_H_ROOT - class is root, which has no parent. | |
2017 | parent == X:0 - parent is root class. | |
2018 | parent == X:Y - parent is a node in hierarchy. | |
2019 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
2020 | ||
2021 | handle == 0:0 - generate handle from kernel pool. | |
2022 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
2023 | handle == X:Y - clear. | |
2024 | handle == X:0 - root class. | |
2025 | */ | |
2026 | ||
2027 | /* Step 1. Determine qdisc handle X:0 */ | |
2028 | ||
de179c8c H |
2029 | portid = tcm->tcm_parent; |
2030 | clid = tcm->tcm_handle; | |
2031 | qid = TC_H_MAJ(clid); | |
2032 | ||
15e47304 EB |
2033 | if (portid != TC_H_ROOT) { |
2034 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
2035 | |
2036 | if (qid && qid1) { | |
2037 | /* If both majors are known, they must be identical. */ | |
2038 | if (qid != qid1) | |
2039 | return -EINVAL; | |
2040 | } else if (qid1) { | |
2041 | qid = qid1; | |
2042 | } else if (qid == 0) | |
af356afa | 2043 | qid = dev->qdisc->handle; |
1da177e4 LT |
2044 | |
2045 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
2046 | * both with parent and child. |
2047 | * | |
15e47304 | 2048 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 2049 | */ |
15e47304 EB |
2050 | if (portid) |
2051 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
2052 | } else { |
2053 | if (qid == 0) | |
af356afa | 2054 | qid = dev->qdisc->handle; |
1da177e4 LT |
2055 | } |
2056 | ||
2057 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
2058 | q = qdisc_lookup(dev, qid); |
2059 | if (!q) | |
1da177e4 LT |
2060 | return -ENOENT; |
2061 | ||
2062 | /* An check that it supports classes */ | |
2063 | cops = q->ops->cl_ops; | |
2064 | if (cops == NULL) | |
2065 | return -EINVAL; | |
2066 | ||
2067 | /* Now try to get class */ | |
2068 | if (clid == 0) { | |
15e47304 | 2069 | if (portid == TC_H_ROOT) |
1da177e4 LT |
2070 | clid = qid; |
2071 | } else | |
2072 | clid = TC_H_MAKE(qid, clid); | |
2073 | ||
2074 | if (clid) | |
143976ce | 2075 | cl = cops->find(q, clid); |
1da177e4 LT |
2076 | |
2077 | if (cl == 0) { | |
2078 | err = -ENOENT; | |
cc7ec456 ED |
2079 | if (n->nlmsg_type != RTM_NEWTCLASS || |
2080 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
2081 | goto out; |
2082 | } else { | |
2083 | switch (n->nlmsg_type) { | |
10297b99 | 2084 | case RTM_NEWTCLASS: |
1da177e4 | 2085 | err = -EEXIST; |
cc7ec456 | 2086 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
2087 | goto out; |
2088 | break; | |
2089 | case RTM_DELTCLASS: | |
14546ba1 | 2090 | err = tclass_del_notify(net, cops, skb, n, q, cl); |
07d79fc7 CW |
2091 | /* Unbind the class with flilters with 0 */ |
2092 | tc_bind_tclass(q, portid, clid, 0); | |
1da177e4 LT |
2093 | goto out; |
2094 | case RTM_GETTCLASS: | |
7316ae88 | 2095 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
2096 | goto out; |
2097 | default: | |
2098 | err = -EINVAL; | |
2099 | goto out; | |
2100 | } | |
2101 | } | |
2102 | ||
d47a6b0e JP |
2103 | if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) { |
2104 | NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes"); | |
2105 | return -EOPNOTSUPP; | |
2106 | } | |
2107 | ||
1da177e4 | 2108 | new_cl = cl; |
de6d5cdf PM |
2109 | err = -EOPNOTSUPP; |
2110 | if (cops->change) | |
793d81d6 | 2111 | err = cops->change(q, clid, portid, tca, &new_cl, extack); |
07d79fc7 | 2112 | if (err == 0) { |
7316ae88 | 2113 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
07d79fc7 CW |
2114 | /* We just create a new class, need to do reverse binding. */ |
2115 | if (cl != new_cl) | |
2116 | tc_bind_tclass(q, portid, clid, new_cl); | |
2117 | } | |
1da177e4 | 2118 | out: |
1da177e4 LT |
2119 | return err; |
2120 | } | |
2121 | ||
cc7ec456 ED |
2122 | struct qdisc_dump_args { |
2123 | struct qdisc_walker w; | |
2124 | struct sk_buff *skb; | |
2125 | struct netlink_callback *cb; | |
1da177e4 LT |
2126 | }; |
2127 | ||
5a7a5555 JHS |
2128 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, |
2129 | struct qdisc_walker *arg) | |
1da177e4 LT |
2130 | { |
2131 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
2132 | ||
15e47304 | 2133 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
2134 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
2135 | RTM_NEWTCLASS); | |
1da177e4 LT |
2136 | } |
2137 | ||
30723673 DM |
2138 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
2139 | struct tcmsg *tcm, struct netlink_callback *cb, | |
2140 | int *t_p, int s_t) | |
2141 | { | |
2142 | struct qdisc_dump_args arg; | |
2143 | ||
49b49971 | 2144 | if (tc_qdisc_dump_ignore(q, false) || |
30723673 DM |
2145 | *t_p < s_t || !q->ops->cl_ops || |
2146 | (tcm->tcm_parent && | |
2147 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
2148 | (*t_p)++; | |
2149 | return 0; | |
2150 | } | |
2151 | if (*t_p > s_t) | |
2152 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
2153 | arg.w.fn = qdisc_class_dump; | |
2154 | arg.skb = skb; | |
2155 | arg.cb = cb; | |
2156 | arg.w.stop = 0; | |
2157 | arg.w.skip = cb->args[1]; | |
2158 | arg.w.count = 0; | |
2159 | q->ops->cl_ops->walk(q, &arg.w); | |
2160 | cb->args[1] = arg.w.count; | |
2161 | if (arg.w.stop) | |
2162 | return -1; | |
2163 | (*t_p)++; | |
2164 | return 0; | |
2165 | } | |
2166 | ||
2167 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
2168 | struct tcmsg *tcm, struct netlink_callback *cb, | |
2169 | int *t_p, int s_t) | |
2170 | { | |
2171 | struct Qdisc *q; | |
59cc1f61 | 2172 | int b; |
30723673 DM |
2173 | |
2174 | if (!root) | |
2175 | return 0; | |
2176 | ||
2177 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
2178 | return -1; | |
2179 | ||
69012ae4 JK |
2180 | if (!qdisc_dev(root)) |
2181 | return 0; | |
2182 | ||
cb395b20 ED |
2183 | if (tcm->tcm_parent) { |
2184 | q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent)); | |
3c53ed8f PS |
2185 | if (q && q != root && |
2186 | tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
cb395b20 ED |
2187 | return -1; |
2188 | return 0; | |
2189 | } | |
59cc1f61 | 2190 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
2191 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
2192 | return -1; | |
2193 | } | |
2194 | ||
2195 | return 0; | |
2196 | } | |
2197 | ||
1da177e4 LT |
2198 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
2199 | { | |
02ef22ca | 2200 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 2201 | struct net *net = sock_net(skb->sk); |
30723673 | 2202 | struct netdev_queue *dev_queue; |
1da177e4 | 2203 | struct net_device *dev; |
30723673 | 2204 | int t, s_t; |
1da177e4 | 2205 | |
573ce260 | 2206 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 2207 | return 0; |
cc7ec456 ED |
2208 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
2209 | if (!dev) | |
1da177e4 LT |
2210 | return 0; |
2211 | ||
2212 | s_t = cb->args[0]; | |
2213 | t = 0; | |
2214 | ||
af356afa | 2215 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
2216 | goto done; |
2217 | ||
24824a09 ED |
2218 | dev_queue = dev_ingress_queue(dev); |
2219 | if (dev_queue && | |
2220 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
2221 | &t, s_t) < 0) | |
30723673 | 2222 | goto done; |
1da177e4 | 2223 | |
30723673 | 2224 | done: |
1da177e4 LT |
2225 | cb->args[0] = t; |
2226 | ||
2227 | dev_put(dev); | |
2228 | return skb->len; | |
2229 | } | |
2230 | ||
1da177e4 LT |
2231 | #ifdef CONFIG_PROC_FS |
2232 | static int psched_show(struct seq_file *seq, void *v) | |
2233 | { | |
2234 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 2235 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 2236 | 1000000, |
1e317688 | 2237 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
2238 | |
2239 | return 0; | |
2240 | } | |
2241 | ||
7316ae88 TG |
2242 | static int __net_init psched_net_init(struct net *net) |
2243 | { | |
2244 | struct proc_dir_entry *e; | |
2245 | ||
3f3942ac | 2246 | e = proc_create_single("psched", 0, net->proc_net, psched_show); |
7316ae88 TG |
2247 | if (e == NULL) |
2248 | return -ENOMEM; | |
2249 | ||
2250 | return 0; | |
2251 | } | |
2252 | ||
2253 | static void __net_exit psched_net_exit(struct net *net) | |
2254 | { | |
ece31ffd | 2255 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
2256 | } |
2257 | #else | |
2258 | static int __net_init psched_net_init(struct net *net) | |
2259 | { | |
2260 | return 0; | |
2261 | } | |
2262 | ||
2263 | static void __net_exit psched_net_exit(struct net *net) | |
2264 | { | |
2265 | } | |
1da177e4 LT |
2266 | #endif |
2267 | ||
7316ae88 TG |
2268 | static struct pernet_operations psched_net_ops = { |
2269 | .init = psched_net_init, | |
2270 | .exit = psched_net_exit, | |
2271 | }; | |
2272 | ||
1da177e4 LT |
2273 | static int __init pktsched_init(void) |
2274 | { | |
7316ae88 TG |
2275 | int err; |
2276 | ||
2277 | err = register_pernet_subsys(&psched_net_ops); | |
2278 | if (err) { | |
cc7ec456 | 2279 | pr_err("pktsched_init: " |
7316ae88 TG |
2280 | "cannot initialize per netns operations\n"); |
2281 | return err; | |
2282 | } | |
2283 | ||
6da7c8fc | 2284 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
2285 | register_qdisc(&pfifo_qdisc_ops); |
2286 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 2287 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 2288 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 2289 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 2290 | |
b97bac64 FW |
2291 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0); |
2292 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0); | |
5a7a5555 | 2293 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, |
b97bac64 FW |
2294 | 0); |
2295 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0); | |
2296 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0); | |
5a7a5555 | 2297 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, |
b97bac64 | 2298 | 0); |
be577ddc | 2299 | |
1da177e4 LT |
2300 | return 0; |
2301 | } | |
2302 | ||
2303 | subsys_initcall(pktsched_init); |