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 | ||
e4bedf48 ED |
415 | if (tab == NULL || r->rate == 0 || |
416 | r->cell_log == 0 || r->cell_log >= 32 || | |
e9bc3fa2 AA |
417 | nla_len(tab) != TC_RTAB_SIZE) { |
418 | NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching"); | |
40edeff6 | 419 | return NULL; |
e9bc3fa2 | 420 | } |
40edeff6 | 421 | |
1da177e4 | 422 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
423 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
424 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
425 | rtab->refcnt++; |
426 | return rtab; | |
427 | } | |
428 | } | |
429 | ||
1da177e4 LT |
430 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
431 | if (rtab) { | |
432 | rtab->rate = *r; | |
433 | rtab->refcnt = 1; | |
1e90474c | 434 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
435 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
436 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
437 | rtab->next = qdisc_rtab_list; |
438 | qdisc_rtab_list = rtab; | |
e9bc3fa2 AA |
439 | } else { |
440 | NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table"); | |
1da177e4 LT |
441 | } |
442 | return rtab; | |
443 | } | |
62e3ba1b | 444 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
445 | |
446 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
447 | { | |
448 | struct qdisc_rate_table *rtab, **rtabp; | |
449 | ||
450 | if (!tab || --tab->refcnt) | |
451 | return; | |
452 | ||
cc7ec456 ED |
453 | for (rtabp = &qdisc_rtab_list; |
454 | (rtab = *rtabp) != NULL; | |
455 | rtabp = &rtab->next) { | |
1da177e4 LT |
456 | if (rtab == tab) { |
457 | *rtabp = rtab->next; | |
458 | kfree(rtab); | |
459 | return; | |
460 | } | |
461 | } | |
462 | } | |
62e3ba1b | 463 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 464 | |
175f9c1b | 465 | static LIST_HEAD(qdisc_stab_list); |
175f9c1b JK |
466 | |
467 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
468 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
469 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
470 | }; | |
471 | ||
09215598 AA |
472 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt, |
473 | struct netlink_ext_ack *extack) | |
175f9c1b JK |
474 | { |
475 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
476 | struct qdisc_size_table *stab; | |
477 | struct tc_sizespec *s; | |
478 | unsigned int tsize = 0; | |
479 | u16 *tab = NULL; | |
480 | int err; | |
481 | ||
8cb08174 JB |
482 | err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy, |
483 | extack); | |
175f9c1b JK |
484 | if (err < 0) |
485 | return ERR_PTR(err); | |
09215598 AA |
486 | if (!tb[TCA_STAB_BASE]) { |
487 | NL_SET_ERR_MSG(extack, "Size table base attribute is missing"); | |
175f9c1b | 488 | return ERR_PTR(-EINVAL); |
09215598 | 489 | } |
175f9c1b JK |
490 | |
491 | s = nla_data(tb[TCA_STAB_BASE]); | |
492 | ||
493 | if (s->tsize > 0) { | |
09215598 AA |
494 | if (!tb[TCA_STAB_DATA]) { |
495 | NL_SET_ERR_MSG(extack, "Size table data attribute is missing"); | |
175f9c1b | 496 | return ERR_PTR(-EINVAL); |
09215598 | 497 | } |
175f9c1b JK |
498 | tab = nla_data(tb[TCA_STAB_DATA]); |
499 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
500 | } | |
501 | ||
09215598 AA |
502 | if (tsize != s->tsize || (!tab && tsize > 0)) { |
503 | NL_SET_ERR_MSG(extack, "Invalid size of size table"); | |
175f9c1b | 504 | return ERR_PTR(-EINVAL); |
09215598 | 505 | } |
175f9c1b | 506 | |
175f9c1b JK |
507 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
508 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
509 | continue; | |
510 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
511 | continue; | |
512 | stab->refcnt++; | |
175f9c1b JK |
513 | return stab; |
514 | } | |
515 | ||
175f9c1b JK |
516 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); |
517 | if (!stab) | |
518 | return ERR_PTR(-ENOMEM); | |
519 | ||
520 | stab->refcnt = 1; | |
521 | stab->szopts = *s; | |
522 | if (tsize > 0) | |
523 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
524 | ||
175f9c1b | 525 | list_add_tail(&stab->list, &qdisc_stab_list); |
175f9c1b JK |
526 | |
527 | return stab; | |
528 | } | |
529 | ||
530 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
531 | { | |
532 | if (!tab) | |
533 | return; | |
534 | ||
175f9c1b JK |
535 | if (--tab->refcnt == 0) { |
536 | list_del(&tab->list); | |
6e07902f | 537 | kfree_rcu(tab, rcu); |
175f9c1b | 538 | } |
175f9c1b JK |
539 | } |
540 | EXPORT_SYMBOL(qdisc_put_stab); | |
541 | ||
542 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
543 | { | |
544 | struct nlattr *nest; | |
545 | ||
ae0be8de | 546 | nest = nla_nest_start_noflag(skb, TCA_STAB); |
3aa4614d PM |
547 | if (nest == NULL) |
548 | goto nla_put_failure; | |
1b34ec43 DM |
549 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
550 | goto nla_put_failure; | |
175f9c1b JK |
551 | nla_nest_end(skb, nest); |
552 | ||
553 | return skb->len; | |
554 | ||
555 | nla_put_failure: | |
556 | return -1; | |
557 | } | |
558 | ||
5a7a5555 JHS |
559 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
560 | const struct qdisc_size_table *stab) | |
175f9c1b JK |
561 | { |
562 | int pkt_len, slot; | |
563 | ||
564 | pkt_len = skb->len + stab->szopts.overhead; | |
565 | if (unlikely(!stab->szopts.tsize)) | |
566 | goto out; | |
567 | ||
568 | slot = pkt_len + stab->szopts.cell_align; | |
569 | if (unlikely(slot < 0)) | |
570 | slot = 0; | |
571 | ||
572 | slot >>= stab->szopts.cell_log; | |
573 | if (likely(slot < stab->szopts.tsize)) | |
574 | pkt_len = stab->data[slot]; | |
575 | else | |
576 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
577 | (slot / stab->szopts.tsize) + | |
578 | stab->data[slot % stab->szopts.tsize]; | |
579 | ||
580 | pkt_len <<= stab->szopts.size_log; | |
581 | out: | |
582 | if (unlikely(pkt_len < 1)) | |
583 | pkt_len = 1; | |
584 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
585 | } | |
a2da570d | 586 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 587 | |
6e765a00 | 588 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
589 | { |
590 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
591 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
592 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
593 | qdisc->flags |= TCQ_F_WARN_NONWC; |
594 | } | |
595 | } | |
596 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
597 | ||
4179477f PM |
598 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
599 | { | |
600 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 601 | timer); |
4179477f | 602 | |
1e203c1a | 603 | rcu_read_lock(); |
8608db03 | 604 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 605 | rcu_read_unlock(); |
1936502d | 606 | |
4179477f PM |
607 | return HRTIMER_NORESTART; |
608 | } | |
609 | ||
860b642b VCG |
610 | void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc, |
611 | clockid_t clockid) | |
4179477f | 612 | { |
860b642b | 613 | hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 614 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
615 | wd->qdisc = qdisc; |
616 | } | |
860b642b VCG |
617 | EXPORT_SYMBOL(qdisc_watchdog_init_clockid); |
618 | ||
619 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
620 | { | |
621 | qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC); | |
622 | } | |
4179477f PM |
623 | EXPORT_SYMBOL(qdisc_watchdog_init); |
624 | ||
efe074c2 ED |
625 | void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires, |
626 | u64 delta_ns) | |
4179477f | 627 | { |
2540e051 JP |
628 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
629 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
630 | return; | |
631 | ||
b88948fb ED |
632 | if (hrtimer_is_queued(&wd->timer)) { |
633 | /* If timer is already set in [expires, expires + delta_ns], | |
634 | * do not reprogram it. | |
635 | */ | |
636 | if (wd->last_expires - expires <= delta_ns) | |
637 | return; | |
638 | } | |
a9efad8b ED |
639 | |
640 | wd->last_expires = expires; | |
efe074c2 ED |
641 | hrtimer_start_range_ns(&wd->timer, |
642 | ns_to_ktime(expires), | |
643 | delta_ns, | |
644 | HRTIMER_MODE_ABS_PINNED); | |
4179477f | 645 | } |
efe074c2 | 646 | EXPORT_SYMBOL(qdisc_watchdog_schedule_range_ns); |
4179477f PM |
647 | |
648 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
649 | { | |
2fbd3da3 | 650 | hrtimer_cancel(&wd->timer); |
4179477f PM |
651 | } |
652 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 653 | |
a94f779f | 654 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 | 655 | { |
6fe1c7a5 | 656 | struct hlist_head *h; |
9695fe6f | 657 | unsigned int i; |
6fe1c7a5 | 658 | |
9695fe6f | 659 | h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL); |
6fe1c7a5 PM |
660 | |
661 | if (h != NULL) { | |
662 | for (i = 0; i < n; i++) | |
663 | INIT_HLIST_HEAD(&h[i]); | |
664 | } | |
665 | return h; | |
666 | } | |
667 | ||
6fe1c7a5 PM |
668 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) |
669 | { | |
670 | struct Qdisc_class_common *cl; | |
b67bfe0d | 671 | struct hlist_node *next; |
6fe1c7a5 PM |
672 | struct hlist_head *nhash, *ohash; |
673 | unsigned int nsize, nmask, osize; | |
674 | unsigned int i, h; | |
675 | ||
676 | /* Rehash when load factor exceeds 0.75 */ | |
677 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
678 | return; | |
679 | nsize = clhash->hashsize * 2; | |
680 | nmask = nsize - 1; | |
681 | nhash = qdisc_class_hash_alloc(nsize); | |
682 | if (nhash == NULL) | |
683 | return; | |
684 | ||
685 | ohash = clhash->hash; | |
686 | osize = clhash->hashsize; | |
687 | ||
688 | sch_tree_lock(sch); | |
689 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 690 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
691 | h = qdisc_class_hash(cl->classid, nmask); |
692 | hlist_add_head(&cl->hnode, &nhash[h]); | |
693 | } | |
694 | } | |
695 | clhash->hash = nhash; | |
696 | clhash->hashsize = nsize; | |
697 | clhash->hashmask = nmask; | |
698 | sch_tree_unlock(sch); | |
699 | ||
9695fe6f | 700 | kvfree(ohash); |
6fe1c7a5 PM |
701 | } |
702 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
703 | ||
704 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
705 | { | |
706 | unsigned int size = 4; | |
707 | ||
708 | clhash->hash = qdisc_class_hash_alloc(size); | |
ac8ef4ab | 709 | if (!clhash->hash) |
6fe1c7a5 PM |
710 | return -ENOMEM; |
711 | clhash->hashsize = size; | |
712 | clhash->hashmask = size - 1; | |
713 | clhash->hashelems = 0; | |
714 | return 0; | |
715 | } | |
716 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
717 | ||
718 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
719 | { | |
9695fe6f | 720 | kvfree(clhash->hash); |
6fe1c7a5 PM |
721 | } |
722 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
723 | ||
724 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
725 | struct Qdisc_class_common *cl) | |
726 | { | |
727 | unsigned int h; | |
728 | ||
729 | INIT_HLIST_NODE(&cl->hnode); | |
730 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
731 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
732 | clhash->hashelems++; | |
733 | } | |
734 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
735 | ||
736 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
737 | struct Qdisc_class_common *cl) | |
738 | { | |
739 | hlist_del(&cl->hnode); | |
740 | clhash->hashelems--; | |
741 | } | |
742 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
743 | ||
fa0f5aa7 ED |
744 | /* Allocate an unique handle from space managed by kernel |
745 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
746 | */ | |
1da177e4 LT |
747 | static u32 qdisc_alloc_handle(struct net_device *dev) |
748 | { | |
fa0f5aa7 | 749 | int i = 0x8000; |
1da177e4 LT |
750 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
751 | ||
752 | do { | |
753 | autohandle += TC_H_MAKE(0x10000U, 0); | |
754 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
755 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
756 | if (!qdisc_lookup(dev, autohandle)) |
757 | return autohandle; | |
758 | cond_resched(); | |
759 | } while (--i > 0); | |
1da177e4 | 760 | |
fa0f5aa7 | 761 | return 0; |
1da177e4 LT |
762 | } |
763 | ||
5f2939d9 | 764 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len) |
43effa1e | 765 | { |
fd5ac14a | 766 | bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED; |
20fea08b | 767 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
768 | unsigned long cl; |
769 | u32 parentid; | |
95946658 | 770 | bool notify; |
2c8c8e6f | 771 | int drops; |
43effa1e | 772 | |
2ccccf5f | 773 | if (n == 0 && len == 0) |
43effa1e | 774 | return; |
2c8c8e6f | 775 | drops = max_t(int, n, 0); |
4eaf3b84 | 776 | rcu_read_lock(); |
43effa1e | 777 | while ((parentid = sch->parent)) { |
066a3b5b | 778 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 779 | break; |
066a3b5b | 780 | |
4eaf3b84 ED |
781 | if (sch->flags & TCQ_F_NOPARENT) |
782 | break; | |
95946658 KK |
783 | /* Notify parent qdisc only if child qdisc becomes empty. |
784 | * | |
785 | * If child was empty even before update then backlog | |
786 | * counter is screwed and we skip notification because | |
787 | * parent class is already passive. | |
fd5ac14a NF |
788 | * |
789 | * If the original child was offloaded then it is allowed | |
790 | * to be seem as empty, so the parent is notified anyway. | |
95946658 | 791 | */ |
fd5ac14a NF |
792 | notify = !sch->q.qlen && !WARN_ON_ONCE(!n && |
793 | !qdisc_is_offloaded); | |
4eaf3b84 | 794 | /* TODO: perform the search on a per txq basis */ |
5ce2d488 | 795 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 796 | if (sch == NULL) { |
4eaf3b84 ED |
797 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
798 | break; | |
ffc8fefa | 799 | } |
43effa1e | 800 | cops = sch->ops->cl_ops; |
95946658 | 801 | if (notify && cops->qlen_notify) { |
143976ce | 802 | cl = cops->find(sch, parentid); |
43effa1e | 803 | cops->qlen_notify(sch, cl); |
43effa1e PM |
804 | } |
805 | sch->q.qlen -= n; | |
2ccccf5f | 806 | sch->qstats.backlog -= len; |
25331d6c | 807 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 808 | } |
4eaf3b84 | 809 | rcu_read_unlock(); |
43effa1e | 810 | } |
2ccccf5f | 811 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
1da177e4 | 812 | |
b592843c JK |
813 | int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type, |
814 | void *type_data) | |
815 | { | |
816 | struct net_device *dev = qdisc_dev(sch); | |
817 | int err; | |
818 | ||
819 | sch->flags &= ~TCQ_F_OFFLOADED; | |
820 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
821 | return 0; | |
822 | ||
823 | err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data); | |
824 | if (err == -EOPNOTSUPP) | |
825 | return 0; | |
826 | ||
827 | if (!err) | |
828 | sch->flags |= TCQ_F_OFFLOADED; | |
829 | ||
830 | return err; | |
831 | } | |
832 | EXPORT_SYMBOL(qdisc_offload_dump_helper); | |
833 | ||
bfaee911 JK |
834 | void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
835 | struct Qdisc *new, struct Qdisc *old, | |
836 | enum tc_setup_type type, void *type_data, | |
837 | struct netlink_ext_ack *extack) | |
838 | { | |
839 | bool any_qdisc_is_offloaded; | |
840 | int err; | |
841 | ||
842 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
843 | return; | |
844 | ||
845 | err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data); | |
846 | ||
847 | /* Don't report error if the graft is part of destroy operation. */ | |
848 | if (!err || !new || new == &noop_qdisc) | |
849 | return; | |
850 | ||
851 | /* Don't report error if the parent, the old child and the new | |
852 | * one are not offloaded. | |
853 | */ | |
854 | any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED; | |
855 | any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED; | |
856 | any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED; | |
857 | ||
858 | if (any_qdisc_is_offloaded) | |
859 | NL_SET_ERR_MSG(extack, "Offloading graft operation failed."); | |
860 | } | |
861 | EXPORT_SYMBOL(qdisc_offload_graft_helper); | |
862 | ||
98b0e5f6 JK |
863 | static void qdisc_offload_graft_root(struct net_device *dev, |
864 | struct Qdisc *new, struct Qdisc *old, | |
865 | struct netlink_ext_ack *extack) | |
866 | { | |
867 | struct tc_root_qopt_offload graft_offload = { | |
868 | .command = TC_ROOT_GRAFT, | |
869 | .handle = new ? new->handle : 0, | |
870 | .ingress = (new && new->flags & TCQ_F_INGRESS) || | |
871 | (old && old->flags & TCQ_F_INGRESS), | |
872 | }; | |
873 | ||
874 | qdisc_offload_graft_helper(dev, NULL, new, old, | |
875 | TC_SETUP_ROOT_QDISC, &graft_offload, extack); | |
876 | } | |
877 | ||
27d7f07c WC |
878 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, |
879 | u32 portid, u32 seq, u16 flags, int event) | |
880 | { | |
881 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; | |
882 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; | |
883 | struct tcmsg *tcm; | |
884 | struct nlmsghdr *nlh; | |
885 | unsigned char *b = skb_tail_pointer(skb); | |
886 | struct gnet_dump d; | |
887 | struct qdisc_size_table *stab; | |
d47a6b0e | 888 | u32 block_index; |
27d7f07c WC |
889 | __u32 qlen; |
890 | ||
891 | cond_resched(); | |
892 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
893 | if (!nlh) | |
894 | goto out_nlmsg_trim; | |
895 | tcm = nlmsg_data(nlh); | |
896 | tcm->tcm_family = AF_UNSPEC; | |
897 | tcm->tcm__pad1 = 0; | |
898 | tcm->tcm__pad2 = 0; | |
899 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
900 | tcm->tcm_parent = clid; | |
901 | tcm->tcm_handle = q->handle; | |
902 | tcm->tcm_info = refcount_read(&q->refcnt); | |
903 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
904 | goto nla_put_failure; | |
d47a6b0e JP |
905 | if (q->ops->ingress_block_get) { |
906 | block_index = q->ops->ingress_block_get(q); | |
907 | if (block_index && | |
908 | nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index)) | |
909 | goto nla_put_failure; | |
910 | } | |
911 | if (q->ops->egress_block_get) { | |
912 | block_index = q->ops->egress_block_get(q); | |
913 | if (block_index && | |
914 | nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index)) | |
915 | goto nla_put_failure; | |
916 | } | |
27d7f07c WC |
917 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
918 | goto nla_put_failure; | |
44edf2f8 NF |
919 | if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED))) |
920 | goto nla_put_failure; | |
7e66016f | 921 | qlen = qdisc_qlen_sum(q); |
27d7f07c WC |
922 | |
923 | stab = rtnl_dereference(q->stab); | |
924 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
925 | goto nla_put_failure; | |
926 | ||
927 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
928 | NULL, &d, TCA_PAD) < 0) | |
929 | goto nla_put_failure; | |
930 | ||
931 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
932 | goto nla_put_failure; | |
933 | ||
934 | if (qdisc_is_percpu_stats(q)) { | |
935 | cpu_bstats = q->cpu_bstats; | |
936 | cpu_qstats = q->cpu_qstats; | |
937 | } | |
938 | ||
939 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q), | |
940 | &d, cpu_bstats, &q->bstats) < 0 || | |
941 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || | |
942 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) | |
943 | goto nla_put_failure; | |
944 | ||
945 | if (gnet_stats_finish_copy(&d) < 0) | |
946 | goto nla_put_failure; | |
947 | ||
948 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
949 | return skb->len; | |
950 | ||
951 | out_nlmsg_trim: | |
952 | nla_put_failure: | |
953 | nlmsg_trim(skb, b); | |
954 | return -1; | |
955 | } | |
956 | ||
957 | static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible) | |
958 | { | |
959 | if (q->flags & TCQ_F_BUILTIN) | |
960 | return true; | |
961 | if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible) | |
962 | return true; | |
963 | ||
964 | return false; | |
965 | } | |
966 | ||
967 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, | |
968 | struct nlmsghdr *n, u32 clid, | |
969 | struct Qdisc *old, struct Qdisc *new) | |
970 | { | |
971 | struct sk_buff *skb; | |
972 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
973 | ||
974 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
975 | if (!skb) | |
976 | return -ENOBUFS; | |
977 | ||
978 | if (old && !tc_qdisc_dump_ignore(old, false)) { | |
979 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, | |
980 | 0, RTM_DELQDISC) < 0) | |
981 | goto err_out; | |
982 | } | |
983 | if (new && !tc_qdisc_dump_ignore(new, false)) { | |
984 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, | |
985 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
986 | goto err_out; | |
987 | } | |
988 | ||
989 | if (skb->len) | |
990 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
991 | n->nlmsg_flags & NLM_F_ECHO); | |
992 | ||
993 | err_out: | |
994 | kfree_skb(skb); | |
995 | return -EINVAL; | |
996 | } | |
997 | ||
7316ae88 TG |
998 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
999 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
1000 | struct Qdisc *old, struct Qdisc *new) |
1001 | { | |
1002 | if (new || old) | |
7316ae88 | 1003 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 1004 | |
4d8863a2 | 1005 | if (old) |
86bd446b | 1006 | qdisc_put(old); |
99194cff DM |
1007 | } |
1008 | ||
8a53e616 PA |
1009 | static void qdisc_clear_nolock(struct Qdisc *sch) |
1010 | { | |
1011 | sch->flags &= ~TCQ_F_NOLOCK; | |
1012 | if (!(sch->flags & TCQ_F_CPUSTATS)) | |
1013 | return; | |
1014 | ||
1015 | free_percpu(sch->cpu_bstats); | |
1016 | free_percpu(sch->cpu_qstats); | |
1017 | sch->cpu_bstats = NULL; | |
1018 | sch->cpu_qstats = NULL; | |
1019 | sch->flags &= ~TCQ_F_CPUSTATS; | |
1020 | } | |
1021 | ||
99194cff DM |
1022 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or |
1023 | * to device "dev". | |
1024 | * | |
1025 | * When appropriate send a netlink notification using 'skb' | |
1026 | * and "n". | |
1027 | * | |
1028 | * On success, destroy old qdisc. | |
1da177e4 LT |
1029 | */ |
1030 | ||
1031 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff | 1032 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
09215598 AA |
1033 | struct Qdisc *new, struct Qdisc *old, |
1034 | struct netlink_ext_ack *extack) | |
1da177e4 | 1035 | { |
99194cff | 1036 | struct Qdisc *q = old; |
7316ae88 | 1037 | struct net *net = dev_net(dev); |
1da177e4 | 1038 | |
10297b99 | 1039 | if (parent == NULL) { |
99194cff DM |
1040 | unsigned int i, num_q, ingress; |
1041 | ||
1042 | ingress = 0; | |
1043 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
1044 | if ((q && q->flags & TCQ_F_INGRESS) || |
1045 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
1046 | num_q = 1; |
1047 | ingress = 1; | |
09215598 AA |
1048 | if (!dev_ingress_queue(dev)) { |
1049 | NL_SET_ERR_MSG(extack, "Device does not have an ingress queue"); | |
24824a09 | 1050 | return -ENOENT; |
09215598 | 1051 | } |
99194cff DM |
1052 | } |
1053 | ||
1054 | if (dev->flags & IFF_UP) | |
1055 | dev_deactivate(dev); | |
1056 | ||
98b0e5f6 JK |
1057 | qdisc_offload_graft_root(dev, new, old, extack); |
1058 | ||
86e363dc WC |
1059 | if (new && new->ops->attach) |
1060 | goto skip; | |
6ec1c69a | 1061 | |
99194cff | 1062 | for (i = 0; i < num_q; i++) { |
24824a09 | 1063 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
1064 | |
1065 | if (!ingress) | |
1066 | dev_queue = netdev_get_tx_queue(dev, i); | |
1067 | ||
8d50b53d DM |
1068 | old = dev_graft_qdisc(dev_queue, new); |
1069 | if (new && i > 0) | |
551143d8 | 1070 | qdisc_refcount_inc(new); |
8d50b53d | 1071 | |
036d6a67 | 1072 | if (!ingress) |
86bd446b | 1073 | qdisc_put(old); |
1da177e4 | 1074 | } |
99194cff | 1075 | |
86e363dc | 1076 | skip: |
036d6a67 | 1077 | if (!ingress) { |
7316ae88 TG |
1078 | notify_and_destroy(net, skb, n, classid, |
1079 | dev->qdisc, new); | |
036d6a67 | 1080 | if (new && !new->ops->attach) |
551143d8 | 1081 | qdisc_refcount_inc(new); |
036d6a67 | 1082 | dev->qdisc = new ? : &noop_qdisc; |
86e363dc WC |
1083 | |
1084 | if (new && new->ops->attach) | |
1085 | new->ops->attach(new); | |
036d6a67 | 1086 | } else { |
7316ae88 | 1087 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 1088 | } |
af356afa | 1089 | |
99194cff DM |
1090 | if (dev->flags & IFF_UP) |
1091 | dev_activate(dev); | |
1da177e4 | 1092 | } else { |
20fea08b | 1093 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
9da93ece JK |
1094 | unsigned long cl; |
1095 | int err; | |
1da177e4 | 1096 | |
c5ad119f | 1097 | /* Only support running class lockless if parent is lockless */ |
8eaf8d99 | 1098 | if (new && (new->flags & TCQ_F_NOLOCK) && !(parent->flags & TCQ_F_NOLOCK)) |
8a53e616 | 1099 | qdisc_clear_nolock(new); |
c5ad119f | 1100 | |
9da93ece JK |
1101 | if (!cops || !cops->graft) |
1102 | return -EOPNOTSUPP; | |
143976ce | 1103 | |
9da93ece JK |
1104 | cl = cops->find(parent, classid); |
1105 | if (!cl) { | |
1106 | NL_SET_ERR_MSG(extack, "Specified class not found"); | |
1107 | return -ENOENT; | |
1da177e4 | 1108 | } |
9da93ece JK |
1109 | |
1110 | err = cops->graft(parent, cl, new, &old, extack); | |
1111 | if (err) | |
1112 | return err; | |
1113 | notify_and_destroy(net, skb, n, classid, old, new); | |
1da177e4 | 1114 | } |
9da93ece | 1115 | return 0; |
1da177e4 LT |
1116 | } |
1117 | ||
d47a6b0e JP |
1118 | static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca, |
1119 | struct netlink_ext_ack *extack) | |
1120 | { | |
1121 | u32 block_index; | |
1122 | ||
1123 | if (tca[TCA_INGRESS_BLOCK]) { | |
1124 | block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]); | |
1125 | ||
1126 | if (!block_index) { | |
1127 | NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0"); | |
1128 | return -EINVAL; | |
1129 | } | |
1130 | if (!sch->ops->ingress_block_set) { | |
1131 | NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported"); | |
1132 | return -EOPNOTSUPP; | |
1133 | } | |
1134 | sch->ops->ingress_block_set(sch, block_index); | |
1135 | } | |
1136 | if (tca[TCA_EGRESS_BLOCK]) { | |
1137 | block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]); | |
1138 | ||
1139 | if (!block_index) { | |
1140 | NL_SET_ERR_MSG(extack, "Egress block index cannot be 0"); | |
1141 | return -EINVAL; | |
1142 | } | |
1143 | if (!sch->ops->egress_block_set) { | |
1144 | NL_SET_ERR_MSG(extack, "Egress block sharing is not supported"); | |
1145 | return -EOPNOTSUPP; | |
1146 | } | |
1147 | sch->ops->egress_block_set(sch, block_index); | |
1148 | } | |
1149 | return 0; | |
1150 | } | |
1151 | ||
1da177e4 LT |
1152 | /* |
1153 | Allocate and initialize new qdisc. | |
1154 | ||
1155 | Parameters are passed via opt. | |
1156 | */ | |
1157 | ||
5a7a5555 JHS |
1158 | static struct Qdisc *qdisc_create(struct net_device *dev, |
1159 | struct netdev_queue *dev_queue, | |
1160 | struct Qdisc *p, u32 parent, u32 handle, | |
09215598 AA |
1161 | struct nlattr **tca, int *errp, |
1162 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1163 | { |
1164 | int err; | |
1e90474c | 1165 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
1166 | struct Qdisc *sch; |
1167 | struct Qdisc_ops *ops; | |
175f9c1b | 1168 | struct qdisc_size_table *stab; |
1da177e4 LT |
1169 | |
1170 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 1171 | #ifdef CONFIG_MODULES |
1da177e4 LT |
1172 | if (ops == NULL && kind != NULL) { |
1173 | char name[IFNAMSIZ]; | |
872f6903 | 1174 | if (nla_strscpy(name, kind, IFNAMSIZ) >= 0) { |
1da177e4 LT |
1175 | /* We dropped the RTNL semaphore in order to |
1176 | * perform the module load. So, even if we | |
1177 | * succeeded in loading the module we have to | |
1178 | * tell the caller to replay the request. We | |
1179 | * indicate this using -EAGAIN. | |
1180 | * We replay the request because the device may | |
1181 | * go away in the mean time. | |
1182 | */ | |
1183 | rtnl_unlock(); | |
1184 | request_module("sch_%s", name); | |
1185 | rtnl_lock(); | |
1186 | ops = qdisc_lookup_ops(kind); | |
1187 | if (ops != NULL) { | |
1188 | /* We will try again qdisc_lookup_ops, | |
1189 | * so don't keep a reference. | |
1190 | */ | |
1191 | module_put(ops->owner); | |
1192 | err = -EAGAIN; | |
1193 | goto err_out; | |
1194 | } | |
1195 | } | |
1196 | } | |
1197 | #endif | |
1198 | ||
b9e2cc0f | 1199 | err = -ENOENT; |
09215598 AA |
1200 | if (!ops) { |
1201 | NL_SET_ERR_MSG(extack, "Specified qdisc not found"); | |
1da177e4 | 1202 | goto err_out; |
09215598 | 1203 | } |
1da177e4 | 1204 | |
d0bd684d | 1205 | sch = qdisc_alloc(dev_queue, ops, extack); |
3d54b82f TG |
1206 | if (IS_ERR(sch)) { |
1207 | err = PTR_ERR(sch); | |
1da177e4 | 1208 | goto err_out2; |
3d54b82f | 1209 | } |
1da177e4 | 1210 | |
ffc8fefa PM |
1211 | sch->parent = parent; |
1212 | ||
3d54b82f | 1213 | if (handle == TC_H_INGRESS) { |
1da177e4 | 1214 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 1215 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
fd44de7c | 1216 | } else { |
fd44de7c PM |
1217 | if (handle == 0) { |
1218 | handle = qdisc_alloc_handle(dev); | |
aaeb1dea IV |
1219 | if (handle == 0) { |
1220 | NL_SET_ERR_MSG(extack, "Maximum number of qdisc handles was exceeded"); | |
1221 | err = -ENOSPC; | |
fd44de7c | 1222 | goto err_out3; |
aaeb1dea | 1223 | } |
fd44de7c | 1224 | } |
1abbe139 | 1225 | if (!netif_is_multiqueue(dev)) |
225734de | 1226 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
1227 | } |
1228 | ||
3d54b82f | 1229 | sch->handle = handle; |
1da177e4 | 1230 | |
84c46dd8 JDB |
1231 | /* This exist to keep backward compatible with a userspace |
1232 | * loophole, what allowed userspace to get IFF_NO_QUEUE | |
1233 | * facility on older kernels by setting tx_queue_len=0 (prior | |
1234 | * to qdisc init), and then forgot to reinit tx_queue_len | |
1235 | * before again attaching a qdisc. | |
1236 | */ | |
1237 | if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { | |
1238 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; | |
1239 | netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); | |
1240 | } | |
1241 | ||
d47a6b0e JP |
1242 | err = qdisc_block_indexes_set(sch, tca, extack); |
1243 | if (err) | |
1244 | goto err_out3; | |
1245 | ||
54160ef6 | 1246 | if (ops->init) { |
e63d7dfd | 1247 | err = ops->init(sch, tca[TCA_OPTIONS], extack); |
54160ef6 AA |
1248 | if (err != 0) |
1249 | goto err_out5; | |
1250 | } | |
22e0f8b9 | 1251 | |
54160ef6 | 1252 | if (tca[TCA_STAB]) { |
09215598 | 1253 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
54160ef6 AA |
1254 | if (IS_ERR(stab)) { |
1255 | err = PTR_ERR(stab); | |
1256 | goto err_out4; | |
023e09a7 | 1257 | } |
54160ef6 AA |
1258 | rcu_assign_pointer(sch->stab, stab); |
1259 | } | |
1260 | if (tca[TCA_RATE]) { | |
1261 | seqcount_t *running; | |
f6e0b239 | 1262 | |
54160ef6 | 1263 | err = -EOPNOTSUPP; |
09215598 AA |
1264 | if (sch->flags & TCQ_F_MQROOT) { |
1265 | NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc"); | |
54160ef6 | 1266 | goto err_out4; |
09215598 | 1267 | } |
1da177e4 | 1268 | |
54160ef6 AA |
1269 | if (sch->parent != TC_H_ROOT && |
1270 | !(sch->flags & TCQ_F_INGRESS) && | |
1271 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
1272 | running = qdisc_root_sleeping_running(sch); | |
1273 | else | |
1274 | running = &sch->running; | |
1275 | ||
1276 | err = gen_new_estimator(&sch->bstats, | |
1277 | sch->cpu_bstats, | |
1278 | &sch->rate_est, | |
1279 | NULL, | |
1280 | running, | |
1281 | tca[TCA_RATE]); | |
09215598 AA |
1282 | if (err) { |
1283 | NL_SET_ERR_MSG(extack, "Failed to generate new estimator"); | |
54160ef6 | 1284 | goto err_out4; |
09215598 | 1285 | } |
1da177e4 | 1286 | } |
54160ef6 AA |
1287 | |
1288 | qdisc_hash_add(sch, false); | |
f5a7833e | 1289 | trace_qdisc_create(ops, dev, parent); |
54160ef6 AA |
1290 | |
1291 | return sch; | |
1292 | ||
1293 | err_out5: | |
87b60cfa | 1294 | /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ |
c1a4872e GF |
1295 | if (ops->destroy) |
1296 | ops->destroy(sch); | |
1da177e4 LT |
1297 | err_out3: |
1298 | dev_put(dev); | |
81d947e2 | 1299 | qdisc_free(sch); |
1da177e4 LT |
1300 | err_out2: |
1301 | module_put(ops->owner); | |
1302 | err_out: | |
1303 | *errp = err; | |
1da177e4 | 1304 | return NULL; |
23bcf634 PM |
1305 | |
1306 | err_out4: | |
1307 | /* | |
1308 | * Any broken qdiscs that would require a ops->reset() here? | |
1309 | * The qdisc was never in action so it shouldn't be necessary. | |
1310 | */ | |
a2da570d | 1311 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1312 | if (ops->destroy) |
1313 | ops->destroy(sch); | |
1314 | goto err_out3; | |
1da177e4 LT |
1315 | } |
1316 | ||
09215598 AA |
1317 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca, |
1318 | struct netlink_ext_ack *extack) | |
1da177e4 | 1319 | { |
a2da570d | 1320 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1321 | int err = 0; |
1da177e4 | 1322 | |
175f9c1b | 1323 | if (tca[TCA_OPTIONS]) { |
09215598 AA |
1324 | if (!sch->ops->change) { |
1325 | NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc"); | |
1da177e4 | 1326 | return -EINVAL; |
09215598 | 1327 | } |
d47a6b0e JP |
1328 | if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) { |
1329 | NL_SET_ERR_MSG(extack, "Change of blocks is not supported"); | |
1330 | return -EOPNOTSUPP; | |
1331 | } | |
2030721c | 1332 | err = sch->ops->change(sch, tca[TCA_OPTIONS], extack); |
1da177e4 LT |
1333 | if (err) |
1334 | return err; | |
1335 | } | |
175f9c1b JK |
1336 | |
1337 | if (tca[TCA_STAB]) { | |
09215598 | 1338 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
175f9c1b JK |
1339 | if (IS_ERR(stab)) |
1340 | return PTR_ERR(stab); | |
1341 | } | |
1342 | ||
a2da570d ED |
1343 | ostab = rtnl_dereference(sch->stab); |
1344 | rcu_assign_pointer(sch->stab, stab); | |
1345 | qdisc_put_stab(ostab); | |
175f9c1b | 1346 | |
23bcf634 | 1347 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1348 | /* NB: ignores errors from replace_estimator |
1349 | because change can't be undone. */ | |
23bcf634 PM |
1350 | if (sch->flags & TCQ_F_MQROOT) |
1351 | goto out; | |
22e0f8b9 JF |
1352 | gen_replace_estimator(&sch->bstats, |
1353 | sch->cpu_bstats, | |
1354 | &sch->rate_est, | |
edb09eb1 ED |
1355 | NULL, |
1356 | qdisc_root_sleeping_running(sch), | |
22e0f8b9 | 1357 | tca[TCA_RATE]); |
23bcf634 PM |
1358 | } |
1359 | out: | |
1da177e4 LT |
1360 | return 0; |
1361 | } | |
1362 | ||
cc7ec456 ED |
1363 | struct check_loop_arg { |
1364 | struct qdisc_walker w; | |
1da177e4 LT |
1365 | struct Qdisc *p; |
1366 | int depth; | |
1367 | }; | |
1368 | ||
5a7a5555 JHS |
1369 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, |
1370 | struct qdisc_walker *w); | |
1da177e4 LT |
1371 | |
1372 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1373 | { | |
1374 | struct check_loop_arg arg; | |
1375 | ||
1376 | if (q->ops->cl_ops == NULL) | |
1377 | return 0; | |
1378 | ||
1379 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1380 | arg.w.fn = check_loop_fn; | |
1381 | arg.depth = depth; | |
1382 | arg.p = p; | |
1383 | q->ops->cl_ops->walk(q, &arg.w); | |
1384 | return arg.w.stop ? -ELOOP : 0; | |
1385 | } | |
1386 | ||
1387 | static int | |
1388 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1389 | { | |
1390 | struct Qdisc *leaf; | |
20fea08b | 1391 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1392 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1393 | ||
1394 | leaf = cops->leaf(q, cl); | |
1395 | if (leaf) { | |
1396 | if (leaf == arg->p || arg->depth > 7) | |
1397 | return -ELOOP; | |
1398 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1399 | } | |
1400 | return 0; | |
1401 | } | |
1402 | ||
8b4c3cdd | 1403 | const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = { |
6f96c3c6 | 1404 | [TCA_KIND] = { .type = NLA_STRING }, |
8b4c3cdd DA |
1405 | [TCA_RATE] = { .type = NLA_BINARY, |
1406 | .len = sizeof(struct tc_estimator) }, | |
1407 | [TCA_STAB] = { .type = NLA_NESTED }, | |
1408 | [TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG }, | |
1409 | [TCA_CHAIN] = { .type = NLA_U32 }, | |
1410 | [TCA_INGRESS_BLOCK] = { .type = NLA_U32 }, | |
1411 | [TCA_EGRESS_BLOCK] = { .type = NLA_U32 }, | |
1412 | }; | |
1413 | ||
e331473f DC |
1414 | /* |
1415 | * Delete/get qdisc. | |
1416 | */ | |
1417 | ||
c21ef3e3 DA |
1418 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1419 | struct netlink_ext_ack *extack) | |
1da177e4 | 1420 | { |
3b1e0a65 | 1421 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1422 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1423 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1424 | struct net_device *dev; |
de179c8c | 1425 | u32 clid; |
1da177e4 LT |
1426 | struct Qdisc *q = NULL; |
1427 | struct Qdisc *p = NULL; | |
1428 | int err; | |
1429 | ||
4e8bbb81 | 1430 | if ((n->nlmsg_type != RTM_GETQDISC) && |
5f013c9b | 1431 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1432 | return -EPERM; |
1433 | ||
8cb08174 JB |
1434 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1435 | rtm_tca_policy, extack); | |
1e90474c PM |
1436 | if (err < 0) |
1437 | return err; | |
1438 | ||
de179c8c H |
1439 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1440 | if (!dev) | |
1441 | return -ENODEV; | |
1442 | ||
1443 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1444 | if (clid) { |
1445 | if (clid != TC_H_ROOT) { | |
1446 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 | 1447 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1448 | if (!p) { |
1449 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid"); | |
1da177e4 | 1450 | return -ENOENT; |
09215598 | 1451 | } |
1da177e4 | 1452 | q = qdisc_leaf(p, clid); |
cc7ec456 ED |
1453 | } else if (dev_ingress_queue(dev)) { |
1454 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1455 | } |
1da177e4 | 1456 | } else { |
af356afa | 1457 | q = dev->qdisc; |
1da177e4 | 1458 | } |
09215598 AA |
1459 | if (!q) { |
1460 | NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device"); | |
1da177e4 | 1461 | return -ENOENT; |
09215598 | 1462 | } |
1da177e4 | 1463 | |
09215598 AA |
1464 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) { |
1465 | NL_SET_ERR_MSG(extack, "Invalid handle"); | |
1da177e4 | 1466 | return -EINVAL; |
09215598 | 1467 | } |
1da177e4 | 1468 | } else { |
cc7ec456 | 1469 | q = qdisc_lookup(dev, tcm->tcm_handle); |
09215598 AA |
1470 | if (!q) { |
1471 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle"); | |
1da177e4 | 1472 | return -ENOENT; |
09215598 | 1473 | } |
1da177e4 LT |
1474 | } |
1475 | ||
09215598 AA |
1476 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1477 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1478 | return -EINVAL; |
09215598 | 1479 | } |
1da177e4 LT |
1480 | |
1481 | if (n->nlmsg_type == RTM_DELQDISC) { | |
09215598 AA |
1482 | if (!clid) { |
1483 | NL_SET_ERR_MSG(extack, "Classid cannot be zero"); | |
1da177e4 | 1484 | return -EINVAL; |
09215598 AA |
1485 | } |
1486 | if (q->handle == 0) { | |
1487 | NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero"); | |
1da177e4 | 1488 | return -ENOENT; |
09215598 AA |
1489 | } |
1490 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack); | |
cc7ec456 | 1491 | if (err != 0) |
1da177e4 | 1492 | return err; |
1da177e4 | 1493 | } else { |
7316ae88 | 1494 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1495 | } |
1496 | return 0; | |
1497 | } | |
1498 | ||
1499 | /* | |
cc7ec456 | 1500 | * Create/change qdisc. |
1da177e4 LT |
1501 | */ |
1502 | ||
c21ef3e3 DA |
1503 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1504 | struct netlink_ext_ack *extack) | |
1da177e4 | 1505 | { |
3b1e0a65 | 1506 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1507 | struct tcmsg *tcm; |
1e90474c | 1508 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1509 | struct net_device *dev; |
1510 | u32 clid; | |
1511 | struct Qdisc *q, *p; | |
1512 | int err; | |
1513 | ||
5f013c9b | 1514 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1515 | return -EPERM; |
1516 | ||
1da177e4 LT |
1517 | replay: |
1518 | /* Reinit, just in case something touches this. */ | |
8cb08174 JB |
1519 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1520 | rtm_tca_policy, extack); | |
de179c8c H |
1521 | if (err < 0) |
1522 | return err; | |
1523 | ||
02ef22ca | 1524 | tcm = nlmsg_data(n); |
1da177e4 LT |
1525 | clid = tcm->tcm_parent; |
1526 | q = p = NULL; | |
1527 | ||
cc7ec456 ED |
1528 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1529 | if (!dev) | |
1da177e4 LT |
1530 | return -ENODEV; |
1531 | ||
1e90474c | 1532 | |
1da177e4 LT |
1533 | if (clid) { |
1534 | if (clid != TC_H_ROOT) { | |
1535 | if (clid != TC_H_INGRESS) { | |
cc7ec456 | 1536 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1537 | if (!p) { |
1538 | NL_SET_ERR_MSG(extack, "Failed to find specified qdisc"); | |
1da177e4 | 1539 | return -ENOENT; |
09215598 | 1540 | } |
1da177e4 | 1541 | q = qdisc_leaf(p, clid); |
cc7ec456 ED |
1542 | } else if (dev_ingress_queue_create(dev)) { |
1543 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1544 | } |
1545 | } else { | |
af356afa | 1546 | q = dev->qdisc; |
1da177e4 LT |
1547 | } |
1548 | ||
1549 | /* It may be default qdisc, ignore it */ | |
1550 | if (q && q->handle == 0) | |
1551 | q = NULL; | |
1552 | ||
1553 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1554 | if (tcm->tcm_handle) { | |
09215598 AA |
1555 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) { |
1556 | NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override"); | |
1da177e4 | 1557 | return -EEXIST; |
09215598 AA |
1558 | } |
1559 | if (TC_H_MIN(tcm->tcm_handle)) { | |
1560 | NL_SET_ERR_MSG(extack, "Invalid minor handle"); | |
1da177e4 | 1561 | return -EINVAL; |
09215598 | 1562 | } |
cc7ec456 | 1563 | q = qdisc_lookup(dev, tcm->tcm_handle); |
8ec69574 | 1564 | if (!q) |
1da177e4 | 1565 | goto create_n_graft; |
09215598 AA |
1566 | if (n->nlmsg_flags & NLM_F_EXCL) { |
1567 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override"); | |
1da177e4 | 1568 | return -EEXIST; |
09215598 | 1569 | } |
0ac4bd68 | 1570 | if (tca[TCA_KIND] && |
09215598 AA |
1571 | nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1572 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1573 | return -EINVAL; |
09215598 | 1574 | } |
1da177e4 | 1575 | if (q == p || |
09215598 AA |
1576 | (p && check_loop(q, p, 0))) { |
1577 | NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected"); | |
1da177e4 | 1578 | return -ELOOP; |
09215598 | 1579 | } |
551143d8 | 1580 | qdisc_refcount_inc(q); |
1da177e4 LT |
1581 | goto graft; |
1582 | } else { | |
cc7ec456 | 1583 | if (!q) |
1da177e4 LT |
1584 | goto create_n_graft; |
1585 | ||
1586 | /* This magic test requires explanation. | |
1587 | * | |
1588 | * We know, that some child q is already | |
1589 | * attached to this parent and have choice: | |
1590 | * either to change it or to create/graft new one. | |
1591 | * | |
1592 | * 1. We are allowed to create/graft only | |
1593 | * if CREATE and REPLACE flags are set. | |
1594 | * | |
1595 | * 2. If EXCL is set, requestor wanted to say, | |
1596 | * that qdisc tcm_handle is not expected | |
1597 | * to exist, so that we choose create/graft too. | |
1598 | * | |
1599 | * 3. The last case is when no flags are set. | |
1600 | * Alas, it is sort of hole in API, we | |
1601 | * cannot decide what to do unambiguously. | |
1602 | * For now we select create/graft, if | |
1603 | * user gave KIND, which does not match existing. | |
1604 | */ | |
cc7ec456 ED |
1605 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1606 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1607 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1608 | (tca[TCA_KIND] && |
1609 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1610 | goto create_n_graft; |
1611 | } | |
1612 | } | |
1613 | } else { | |
09215598 AA |
1614 | if (!tcm->tcm_handle) { |
1615 | NL_SET_ERR_MSG(extack, "Handle cannot be zero"); | |
1da177e4 | 1616 | return -EINVAL; |
09215598 | 1617 | } |
1da177e4 LT |
1618 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1619 | } | |
1620 | ||
1621 | /* Change qdisc parameters */ | |
09215598 AA |
1622 | if (!q) { |
1623 | NL_SET_ERR_MSG(extack, "Specified qdisc not found"); | |
1da177e4 | 1624 | return -ENOENT; |
09215598 AA |
1625 | } |
1626 | if (n->nlmsg_flags & NLM_F_EXCL) { | |
1627 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify"); | |
1da177e4 | 1628 | return -EEXIST; |
09215598 AA |
1629 | } |
1630 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { | |
1631 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1632 | return -EINVAL; |
09215598 AA |
1633 | } |
1634 | err = qdisc_change(q, tca, extack); | |
1da177e4 | 1635 | if (err == 0) |
7316ae88 | 1636 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1637 | return err; |
1638 | ||
1639 | create_n_graft: | |
09215598 AA |
1640 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
1641 | NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag"); | |
1da177e4 | 1642 | return -ENOENT; |
09215598 | 1643 | } |
24824a09 | 1644 | if (clid == TC_H_INGRESS) { |
09215598 | 1645 | if (dev_ingress_queue(dev)) { |
24824a09 ED |
1646 | q = qdisc_create(dev, dev_ingress_queue(dev), p, |
1647 | tcm->tcm_parent, tcm->tcm_parent, | |
09215598 AA |
1648 | tca, &err, extack); |
1649 | } else { | |
1650 | NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device"); | |
24824a09 | 1651 | err = -ENOENT; |
09215598 | 1652 | } |
24824a09 | 1653 | } else { |
926e61b7 | 1654 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1655 | |
1656 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1657 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1658 | else if (p) | |
1659 | dev_queue = p->dev_queue; | |
1660 | else | |
1661 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1662 | |
926e61b7 | 1663 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1664 | tcm->tcm_parent, tcm->tcm_handle, |
09215598 | 1665 | tca, &err, extack); |
6ec1c69a | 1666 | } |
1da177e4 LT |
1667 | if (q == NULL) { |
1668 | if (err == -EAGAIN) | |
1669 | goto replay; | |
1670 | return err; | |
1671 | } | |
1672 | ||
1673 | graft: | |
09215598 | 1674 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack); |
e5befbd9 IJ |
1675 | if (err) { |
1676 | if (q) | |
86bd446b | 1677 | qdisc_put(q); |
e5befbd9 | 1678 | return err; |
1da177e4 | 1679 | } |
e5befbd9 | 1680 | |
1da177e4 LT |
1681 | return 0; |
1682 | } | |
1683 | ||
30723673 DM |
1684 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1685 | struct netlink_callback *cb, | |
49b49971 JK |
1686 | int *q_idx_p, int s_q_idx, bool recur, |
1687 | bool dump_invisible) | |
30723673 DM |
1688 | { |
1689 | int ret = 0, q_idx = *q_idx_p; | |
1690 | struct Qdisc *q; | |
59cc1f61 | 1691 | int b; |
30723673 DM |
1692 | |
1693 | if (!root) | |
1694 | return 0; | |
1695 | ||
1696 | q = root; | |
1697 | if (q_idx < s_q_idx) { | |
1698 | q_idx++; | |
1699 | } else { | |
49b49971 | 1700 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1701 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1702 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1703 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1704 | goto done; |
1705 | q_idx++; | |
1706 | } | |
69012ae4 | 1707 | |
ea327469 JK |
1708 | /* If dumping singletons, there is no qdisc_dev(root) and the singleton |
1709 | * itself has already been dumped. | |
1710 | * | |
1711 | * If we've already dumped the top-level (ingress) qdisc above and the global | |
1712 | * qdisc hashtable, we don't want to hit it again | |
1713 | */ | |
1714 | if (!qdisc_dev(root) || !recur) | |
69012ae4 JK |
1715 | goto out; |
1716 | ||
59cc1f61 | 1717 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1718 | if (q_idx < s_q_idx) { |
1719 | q_idx++; | |
1720 | continue; | |
1721 | } | |
49b49971 | 1722 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1723 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1724 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1725 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1726 | goto done; |
1727 | q_idx++; | |
1728 | } | |
1729 | ||
1730 | out: | |
1731 | *q_idx_p = q_idx; | |
1732 | return ret; | |
1733 | done: | |
1734 | ret = -1; | |
1735 | goto out; | |
1736 | } | |
1737 | ||
1da177e4 LT |
1738 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1739 | { | |
3b1e0a65 | 1740 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1741 | int idx, q_idx; |
1742 | int s_idx, s_q_idx; | |
1743 | struct net_device *dev; | |
49b49971 | 1744 | const struct nlmsghdr *nlh = cb->nlh; |
49b49971 JK |
1745 | struct nlattr *tca[TCA_MAX + 1]; |
1746 | int err; | |
1da177e4 LT |
1747 | |
1748 | s_idx = cb->args[0]; | |
1749 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1750 | |
7562f876 | 1751 | idx = 0; |
15dc36eb | 1752 | ASSERT_RTNL(); |
49b49971 | 1753 | |
8cb08174 JB |
1754 | err = nlmsg_parse_deprecated(nlh, sizeof(struct tcmsg), tca, TCA_MAX, |
1755 | rtm_tca_policy, cb->extack); | |
49b49971 JK |
1756 | if (err < 0) |
1757 | return err; | |
1758 | ||
15dc36eb | 1759 | for_each_netdev(net, dev) { |
30723673 DM |
1760 | struct netdev_queue *dev_queue; |
1761 | ||
1da177e4 | 1762 | if (idx < s_idx) |
7562f876 | 1763 | goto cont; |
1da177e4 LT |
1764 | if (idx > s_idx) |
1765 | s_q_idx = 0; | |
1da177e4 | 1766 | q_idx = 0; |
30723673 | 1767 | |
5a7a5555 | 1768 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx, |
49b49971 | 1769 | true, tca[TCA_DUMP_INVISIBLE]) < 0) |
30723673 DM |
1770 | goto done; |
1771 | ||
24824a09 ED |
1772 | dev_queue = dev_ingress_queue(dev); |
1773 | if (dev_queue && | |
1774 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
49b49971 JK |
1775 | &q_idx, s_q_idx, false, |
1776 | tca[TCA_DUMP_INVISIBLE]) < 0) | |
30723673 DM |
1777 | goto done; |
1778 | ||
7562f876 PE |
1779 | cont: |
1780 | idx++; | |
1da177e4 LT |
1781 | } |
1782 | ||
1783 | done: | |
1da177e4 LT |
1784 | cb->args[0] = idx; |
1785 | cb->args[1] = q_idx; | |
1786 | ||
1787 | return skb->len; | |
1788 | } | |
1789 | ||
1790 | ||
1791 | ||
1792 | /************************************************ | |
1793 | * Traffic classes manipulation. * | |
1794 | ************************************************/ | |
1795 | ||
27d7f07c WC |
1796 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, |
1797 | unsigned long cl, | |
1798 | u32 portid, u32 seq, u16 flags, int event) | |
1799 | { | |
1800 | struct tcmsg *tcm; | |
1801 | struct nlmsghdr *nlh; | |
1802 | unsigned char *b = skb_tail_pointer(skb); | |
1803 | struct gnet_dump d; | |
1804 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; | |
1da177e4 | 1805 | |
27d7f07c WC |
1806 | cond_resched(); |
1807 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1808 | if (!nlh) | |
1809 | goto out_nlmsg_trim; | |
1810 | tcm = nlmsg_data(nlh); | |
1811 | tcm->tcm_family = AF_UNSPEC; | |
1812 | tcm->tcm__pad1 = 0; | |
1813 | tcm->tcm__pad2 = 0; | |
1814 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1815 | tcm->tcm_parent = q->handle; | |
1816 | tcm->tcm_handle = q->handle; | |
1817 | tcm->tcm_info = 0; | |
1818 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
1819 | goto nla_put_failure; | |
1820 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) | |
1821 | goto nla_put_failure; | |
1822 | ||
1823 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
1824 | NULL, &d, TCA_PAD) < 0) | |
1825 | goto nla_put_failure; | |
1826 | ||
1827 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1828 | goto nla_put_failure; | |
1829 | ||
1830 | if (gnet_stats_finish_copy(&d) < 0) | |
1831 | goto nla_put_failure; | |
1832 | ||
1833 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1834 | return skb->len; | |
1835 | ||
1836 | out_nlmsg_trim: | |
1837 | nla_put_failure: | |
1838 | nlmsg_trim(skb, b); | |
1839 | return -1; | |
1840 | } | |
1841 | ||
1842 | static int tclass_notify(struct net *net, struct sk_buff *oskb, | |
1843 | struct nlmsghdr *n, struct Qdisc *q, | |
1844 | unsigned long cl, int event) | |
1845 | { | |
1846 | struct sk_buff *skb; | |
1847 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
5b5f99b1 | 1848 | int err = 0; |
27d7f07c WC |
1849 | |
1850 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1851 | if (!skb) | |
1852 | return -ENOBUFS; | |
1853 | ||
1854 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { | |
1855 | kfree_skb(skb); | |
1856 | return -EINVAL; | |
1857 | } | |
1858 | ||
5b5f99b1 ZW |
1859 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1860 | n->nlmsg_flags & NLM_F_ECHO); | |
1861 | if (err > 0) | |
1862 | err = 0; | |
1863 | return err; | |
27d7f07c | 1864 | } |
1da177e4 | 1865 | |
14546ba1 WC |
1866 | static int tclass_del_notify(struct net *net, |
1867 | const struct Qdisc_class_ops *cops, | |
1868 | struct sk_buff *oskb, struct nlmsghdr *n, | |
4dd78a73 MM |
1869 | struct Qdisc *q, unsigned long cl, |
1870 | struct netlink_ext_ack *extack) | |
14546ba1 WC |
1871 | { |
1872 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1873 | struct sk_buff *skb; | |
1874 | int err = 0; | |
1875 | ||
1876 | if (!cops->delete) | |
1877 | return -EOPNOTSUPP; | |
1878 | ||
1879 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1880 | if (!skb) | |
1881 | return -ENOBUFS; | |
1882 | ||
1883 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, | |
1884 | RTM_DELTCLASS) < 0) { | |
1885 | kfree_skb(skb); | |
1886 | return -EINVAL; | |
1887 | } | |
1888 | ||
4dd78a73 | 1889 | err = cops->delete(q, cl, extack); |
14546ba1 WC |
1890 | if (err) { |
1891 | kfree_skb(skb); | |
1892 | return err; | |
1893 | } | |
1894 | ||
5b5f99b1 ZW |
1895 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1896 | n->nlmsg_flags & NLM_F_ECHO); | |
1897 | if (err > 0) | |
1898 | err = 0; | |
1899 | return err; | |
14546ba1 WC |
1900 | } |
1901 | ||
07d79fc7 CW |
1902 | #ifdef CONFIG_NET_CLS |
1903 | ||
1904 | struct tcf_bind_args { | |
1905 | struct tcf_walker w; | |
2e24cd75 | 1906 | unsigned long base; |
07d79fc7 | 1907 | unsigned long cl; |
2e24cd75 | 1908 | u32 classid; |
07d79fc7 CW |
1909 | }; |
1910 | ||
1911 | static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg) | |
1912 | { | |
1913 | struct tcf_bind_args *a = (void *)arg; | |
1914 | ||
1915 | if (tp->ops->bind_class) { | |
74e3be60 JP |
1916 | struct Qdisc *q = tcf_block_q(tp->chain->block); |
1917 | ||
1918 | sch_tree_lock(q); | |
2e24cd75 | 1919 | tp->ops->bind_class(n, a->classid, a->cl, q, a->base); |
74e3be60 | 1920 | sch_tree_unlock(q); |
07d79fc7 CW |
1921 | } |
1922 | return 0; | |
1923 | } | |
1924 | ||
760d228e CW |
1925 | struct tc_bind_class_args { |
1926 | struct qdisc_walker w; | |
1927 | unsigned long new_cl; | |
1928 | u32 portid; | |
1929 | u32 clid; | |
1930 | }; | |
1931 | ||
1932 | static int tc_bind_class_walker(struct Qdisc *q, unsigned long cl, | |
1933 | struct qdisc_walker *w) | |
07d79fc7 | 1934 | { |
760d228e | 1935 | struct tc_bind_class_args *a = (struct tc_bind_class_args *)w; |
07d79fc7 CW |
1936 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1937 | struct tcf_block *block; | |
1938 | struct tcf_chain *chain; | |
07d79fc7 | 1939 | |
cbaacc4e | 1940 | block = cops->tcf_block(q, cl, NULL); |
07d79fc7 | 1941 | if (!block) |
760d228e | 1942 | return 0; |
bbf73830 VB |
1943 | for (chain = tcf_get_next_chain(block, NULL); |
1944 | chain; | |
1945 | chain = tcf_get_next_chain(block, chain)) { | |
07d79fc7 CW |
1946 | struct tcf_proto *tp; |
1947 | ||
0fca55ed VB |
1948 | for (tp = tcf_get_next_proto(chain, NULL); |
1949 | tp; tp = tcf_get_next_proto(chain, tp)) { | |
07d79fc7 CW |
1950 | struct tcf_bind_args arg = {}; |
1951 | ||
1952 | arg.w.fn = tcf_node_bind; | |
760d228e | 1953 | arg.classid = a->clid; |
2e24cd75 | 1954 | arg.base = cl; |
760d228e | 1955 | arg.cl = a->new_cl; |
12db03b6 | 1956 | tp->ops->walk(tp, &arg.w, true); |
07d79fc7 CW |
1957 | } |
1958 | } | |
760d228e CW |
1959 | |
1960 | return 0; | |
1961 | } | |
1962 | ||
1963 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
1964 | unsigned long new_cl) | |
1965 | { | |
1966 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1967 | struct tc_bind_class_args args = {}; | |
1968 | ||
1969 | if (!cops->tcf_block) | |
1970 | return; | |
1971 | args.portid = portid; | |
1972 | args.clid = clid; | |
1973 | args.new_cl = new_cl; | |
1974 | args.w.fn = tc_bind_class_walker; | |
1975 | q->ops->cl_ops->walk(q, &args.w); | |
07d79fc7 CW |
1976 | } |
1977 | ||
1978 | #else | |
1979 | ||
1980 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
1981 | unsigned long new_cl) | |
1982 | { | |
1983 | } | |
1984 | ||
1985 | #endif | |
1986 | ||
c21ef3e3 DA |
1987 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, |
1988 | struct netlink_ext_ack *extack) | |
1da177e4 | 1989 | { |
3b1e0a65 | 1990 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1991 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1992 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1993 | struct net_device *dev; |
1994 | struct Qdisc *q = NULL; | |
20fea08b | 1995 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1996 | unsigned long cl = 0; |
1997 | unsigned long new_cl; | |
de179c8c H |
1998 | u32 portid; |
1999 | u32 clid; | |
2000 | u32 qid; | |
1da177e4 LT |
2001 | int err; |
2002 | ||
4e8bbb81 | 2003 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
5f013c9b | 2004 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
2005 | return -EPERM; |
2006 | ||
8cb08174 JB |
2007 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
2008 | rtm_tca_policy, extack); | |
1e90474c PM |
2009 | if (err < 0) |
2010 | return err; | |
2011 | ||
de179c8c H |
2012 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
2013 | if (!dev) | |
2014 | return -ENODEV; | |
2015 | ||
1da177e4 LT |
2016 | /* |
2017 | parent == TC_H_UNSPEC - unspecified parent. | |
2018 | parent == TC_H_ROOT - class is root, which has no parent. | |
2019 | parent == X:0 - parent is root class. | |
2020 | parent == X:Y - parent is a node in hierarchy. | |
2021 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
2022 | ||
2023 | handle == 0:0 - generate handle from kernel pool. | |
2024 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
2025 | handle == X:Y - clear. | |
2026 | handle == X:0 - root class. | |
2027 | */ | |
2028 | ||
2029 | /* Step 1. Determine qdisc handle X:0 */ | |
2030 | ||
de179c8c H |
2031 | portid = tcm->tcm_parent; |
2032 | clid = tcm->tcm_handle; | |
2033 | qid = TC_H_MAJ(clid); | |
2034 | ||
15e47304 EB |
2035 | if (portid != TC_H_ROOT) { |
2036 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
2037 | |
2038 | if (qid && qid1) { | |
2039 | /* If both majors are known, they must be identical. */ | |
2040 | if (qid != qid1) | |
2041 | return -EINVAL; | |
2042 | } else if (qid1) { | |
2043 | qid = qid1; | |
2044 | } else if (qid == 0) | |
af356afa | 2045 | qid = dev->qdisc->handle; |
1da177e4 LT |
2046 | |
2047 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
2048 | * both with parent and child. |
2049 | * | |
15e47304 | 2050 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 2051 | */ |
15e47304 EB |
2052 | if (portid) |
2053 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
2054 | } else { |
2055 | if (qid == 0) | |
af356afa | 2056 | qid = dev->qdisc->handle; |
1da177e4 LT |
2057 | } |
2058 | ||
2059 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
2060 | q = qdisc_lookup(dev, qid); |
2061 | if (!q) | |
1da177e4 LT |
2062 | return -ENOENT; |
2063 | ||
2064 | /* An check that it supports classes */ | |
2065 | cops = q->ops->cl_ops; | |
2066 | if (cops == NULL) | |
2067 | return -EINVAL; | |
2068 | ||
2069 | /* Now try to get class */ | |
2070 | if (clid == 0) { | |
15e47304 | 2071 | if (portid == TC_H_ROOT) |
1da177e4 LT |
2072 | clid = qid; |
2073 | } else | |
2074 | clid = TC_H_MAKE(qid, clid); | |
2075 | ||
2076 | if (clid) | |
143976ce | 2077 | cl = cops->find(q, clid); |
1da177e4 LT |
2078 | |
2079 | if (cl == 0) { | |
2080 | err = -ENOENT; | |
cc7ec456 ED |
2081 | if (n->nlmsg_type != RTM_NEWTCLASS || |
2082 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
2083 | goto out; |
2084 | } else { | |
2085 | switch (n->nlmsg_type) { | |
10297b99 | 2086 | case RTM_NEWTCLASS: |
1da177e4 | 2087 | err = -EEXIST; |
cc7ec456 | 2088 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
2089 | goto out; |
2090 | break; | |
2091 | case RTM_DELTCLASS: | |
4dd78a73 | 2092 | err = tclass_del_notify(net, cops, skb, n, q, cl, extack); |
07d79fc7 CW |
2093 | /* Unbind the class with flilters with 0 */ |
2094 | tc_bind_tclass(q, portid, clid, 0); | |
1da177e4 LT |
2095 | goto out; |
2096 | case RTM_GETTCLASS: | |
7316ae88 | 2097 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
2098 | goto out; |
2099 | default: | |
2100 | err = -EINVAL; | |
2101 | goto out; | |
2102 | } | |
2103 | } | |
2104 | ||
d47a6b0e JP |
2105 | if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) { |
2106 | NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes"); | |
2107 | return -EOPNOTSUPP; | |
2108 | } | |
2109 | ||
1da177e4 | 2110 | new_cl = cl; |
de6d5cdf PM |
2111 | err = -EOPNOTSUPP; |
2112 | if (cops->change) | |
793d81d6 | 2113 | err = cops->change(q, clid, portid, tca, &new_cl, extack); |
07d79fc7 | 2114 | if (err == 0) { |
7316ae88 | 2115 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
07d79fc7 CW |
2116 | /* We just create a new class, need to do reverse binding. */ |
2117 | if (cl != new_cl) | |
2118 | tc_bind_tclass(q, portid, clid, new_cl); | |
2119 | } | |
1da177e4 | 2120 | out: |
1da177e4 LT |
2121 | return err; |
2122 | } | |
2123 | ||
cc7ec456 ED |
2124 | struct qdisc_dump_args { |
2125 | struct qdisc_walker w; | |
2126 | struct sk_buff *skb; | |
2127 | struct netlink_callback *cb; | |
1da177e4 LT |
2128 | }; |
2129 | ||
5a7a5555 JHS |
2130 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, |
2131 | struct qdisc_walker *arg) | |
1da177e4 LT |
2132 | { |
2133 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
2134 | ||
15e47304 | 2135 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
2136 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
2137 | RTM_NEWTCLASS); | |
1da177e4 LT |
2138 | } |
2139 | ||
30723673 DM |
2140 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
2141 | struct tcmsg *tcm, struct netlink_callback *cb, | |
2142 | int *t_p, int s_t) | |
2143 | { | |
2144 | struct qdisc_dump_args arg; | |
2145 | ||
49b49971 | 2146 | if (tc_qdisc_dump_ignore(q, false) || |
30723673 DM |
2147 | *t_p < s_t || !q->ops->cl_ops || |
2148 | (tcm->tcm_parent && | |
2149 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
2150 | (*t_p)++; | |
2151 | return 0; | |
2152 | } | |
2153 | if (*t_p > s_t) | |
2154 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
2155 | arg.w.fn = qdisc_class_dump; | |
2156 | arg.skb = skb; | |
2157 | arg.cb = cb; | |
2158 | arg.w.stop = 0; | |
2159 | arg.w.skip = cb->args[1]; | |
2160 | arg.w.count = 0; | |
2161 | q->ops->cl_ops->walk(q, &arg.w); | |
2162 | cb->args[1] = arg.w.count; | |
2163 | if (arg.w.stop) | |
2164 | return -1; | |
2165 | (*t_p)++; | |
2166 | return 0; | |
2167 | } | |
2168 | ||
2169 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
2170 | struct tcmsg *tcm, struct netlink_callback *cb, | |
bfc25605 | 2171 | int *t_p, int s_t, bool recur) |
30723673 DM |
2172 | { |
2173 | struct Qdisc *q; | |
59cc1f61 | 2174 | int b; |
30723673 DM |
2175 | |
2176 | if (!root) | |
2177 | return 0; | |
2178 | ||
2179 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
2180 | return -1; | |
2181 | ||
bfc25605 | 2182 | if (!qdisc_dev(root) || !recur) |
69012ae4 JK |
2183 | return 0; |
2184 | ||
cb395b20 ED |
2185 | if (tcm->tcm_parent) { |
2186 | q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent)); | |
3c53ed8f PS |
2187 | if (q && q != root && |
2188 | tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
cb395b20 ED |
2189 | return -1; |
2190 | return 0; | |
2191 | } | |
59cc1f61 | 2192 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
2193 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
2194 | return -1; | |
2195 | } | |
2196 | ||
2197 | return 0; | |
2198 | } | |
2199 | ||
1da177e4 LT |
2200 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
2201 | { | |
02ef22ca | 2202 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 2203 | struct net *net = sock_net(skb->sk); |
30723673 | 2204 | struct netdev_queue *dev_queue; |
1da177e4 | 2205 | struct net_device *dev; |
30723673 | 2206 | int t, s_t; |
1da177e4 | 2207 | |
573ce260 | 2208 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 2209 | return 0; |
cc7ec456 ED |
2210 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
2211 | if (!dev) | |
1da177e4 LT |
2212 | return 0; |
2213 | ||
2214 | s_t = cb->args[0]; | |
2215 | t = 0; | |
2216 | ||
bfc25605 | 2217 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t, true) < 0) |
30723673 DM |
2218 | goto done; |
2219 | ||
24824a09 ED |
2220 | dev_queue = dev_ingress_queue(dev); |
2221 | if (dev_queue && | |
2222 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
bfc25605 | 2223 | &t, s_t, false) < 0) |
30723673 | 2224 | goto done; |
1da177e4 | 2225 | |
30723673 | 2226 | done: |
1da177e4 LT |
2227 | cb->args[0] = t; |
2228 | ||
2229 | dev_put(dev); | |
2230 | return skb->len; | |
2231 | } | |
2232 | ||
1da177e4 LT |
2233 | #ifdef CONFIG_PROC_FS |
2234 | static int psched_show(struct seq_file *seq, void *v) | |
2235 | { | |
2236 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 2237 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 2238 | 1000000, |
1e317688 | 2239 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
2240 | |
2241 | return 0; | |
2242 | } | |
2243 | ||
7316ae88 TG |
2244 | static int __net_init psched_net_init(struct net *net) |
2245 | { | |
2246 | struct proc_dir_entry *e; | |
2247 | ||
3f3942ac | 2248 | e = proc_create_single("psched", 0, net->proc_net, psched_show); |
7316ae88 TG |
2249 | if (e == NULL) |
2250 | return -ENOMEM; | |
2251 | ||
2252 | return 0; | |
2253 | } | |
2254 | ||
2255 | static void __net_exit psched_net_exit(struct net *net) | |
2256 | { | |
ece31ffd | 2257 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
2258 | } |
2259 | #else | |
2260 | static int __net_init psched_net_init(struct net *net) | |
2261 | { | |
2262 | return 0; | |
2263 | } | |
2264 | ||
2265 | static void __net_exit psched_net_exit(struct net *net) | |
2266 | { | |
2267 | } | |
1da177e4 LT |
2268 | #endif |
2269 | ||
7316ae88 TG |
2270 | static struct pernet_operations psched_net_ops = { |
2271 | .init = psched_net_init, | |
2272 | .exit = psched_net_exit, | |
2273 | }; | |
2274 | ||
1da177e4 LT |
2275 | static int __init pktsched_init(void) |
2276 | { | |
7316ae88 TG |
2277 | int err; |
2278 | ||
2279 | err = register_pernet_subsys(&psched_net_ops); | |
2280 | if (err) { | |
cc7ec456 | 2281 | pr_err("pktsched_init: " |
7316ae88 TG |
2282 | "cannot initialize per netns operations\n"); |
2283 | return err; | |
2284 | } | |
2285 | ||
6da7c8fc | 2286 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
2287 | register_qdisc(&pfifo_qdisc_ops); |
2288 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 2289 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 2290 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 2291 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 2292 | |
b97bac64 FW |
2293 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0); |
2294 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0); | |
5a7a5555 | 2295 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, |
b97bac64 FW |
2296 | 0); |
2297 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0); | |
2298 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0); | |
5a7a5555 | 2299 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, |
b97bac64 | 2300 | 0); |
be577ddc | 2301 | |
1da177e4 LT |
2302 | return 0; |
2303 | } | |
2304 | ||
2305 | subsys_initcall(pktsched_init); |