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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 | |
1da177e4 LT |
35 | /* |
36 | ||
37 | Short review. | |
38 | ------------- | |
39 | ||
40 | This file consists of two interrelated parts: | |
41 | ||
42 | 1. queueing disciplines manager frontend. | |
43 | 2. traffic classes manager frontend. | |
44 | ||
45 | Generally, queueing discipline ("qdisc") is a black box, | |
46 | which is able to enqueue packets and to dequeue them (when | |
47 | device is ready to send something) in order and at times | |
48 | determined by algorithm hidden in it. | |
49 | ||
50 | qdisc's are divided to two categories: | |
51 | - "queues", which have no internal structure visible from outside. | |
52 | - "schedulers", which split all the packets to "traffic classes", | |
53 | using "packet classifiers" (look at cls_api.c) | |
54 | ||
55 | In turn, classes may have child qdiscs (as rule, queues) | |
56 | attached to them etc. etc. etc. | |
57 | ||
58 | The goal of the routines in this file is to translate | |
59 | information supplied by user in the form of handles | |
60 | to more intelligible for kernel form, to make some sanity | |
61 | checks and part of work, which is common to all qdiscs | |
62 | and to provide rtnetlink notifications. | |
63 | ||
64 | All real intelligent work is done inside qdisc modules. | |
65 | ||
66 | ||
67 | ||
68 | Every discipline has two major routines: enqueue and dequeue. | |
69 | ||
70 | ---dequeue | |
71 | ||
72 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
73 | but it does not mean that queue is empty, it just means that | |
74 | discipline does not want to send anything this time. | |
75 | Queue is really empty if q->q.qlen == 0. | |
76 | For complicated disciplines with multiple queues q->q is not | |
77 | real packet queue, but however q->q.qlen must be valid. | |
78 | ||
79 | ---enqueue | |
80 | ||
81 | enqueue returns 0, if packet was enqueued successfully. | |
82 | If packet (this one or another one) was dropped, it returns | |
83 | not zero error code. | |
84 | NET_XMIT_DROP - this packet dropped | |
85 | Expected action: do not backoff, but wait until queue will clear. | |
86 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
87 | Expected action: backoff or ignore | |
1da177e4 LT |
88 | |
89 | Auxiliary routines: | |
90 | ||
99c0db26 JP |
91 | ---peek |
92 | ||
93 | like dequeue but without removing a packet from the queue | |
94 | ||
1da177e4 LT |
95 | ---reset |
96 | ||
97 | returns qdisc to initial state: purge all buffers, clear all | |
98 | timers, counters (except for statistics) etc. | |
99 | ||
100 | ---init | |
101 | ||
102 | initializes newly created qdisc. | |
103 | ||
104 | ---destroy | |
105 | ||
106 | destroys resources allocated by init and during lifetime of qdisc. | |
107 | ||
108 | ---change | |
109 | ||
110 | changes qdisc parameters. | |
111 | */ | |
112 | ||
113 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
114 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
115 | ||
116 | ||
117 | /************************************************ | |
118 | * Queueing disciplines manipulation. * | |
119 | ************************************************/ | |
120 | ||
121 | ||
122 | /* The list of all installed queueing disciplines. */ | |
123 | ||
124 | static struct Qdisc_ops *qdisc_base; | |
125 | ||
21eb2189 | 126 | /* Register/unregister queueing discipline */ |
1da177e4 LT |
127 | |
128 | int register_qdisc(struct Qdisc_ops *qops) | |
129 | { | |
130 | struct Qdisc_ops *q, **qp; | |
131 | int rc = -EEXIST; | |
132 | ||
133 | write_lock(&qdisc_mod_lock); | |
134 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
135 | if (!strcmp(qops->id, q->id)) | |
136 | goto out; | |
137 | ||
138 | if (qops->enqueue == NULL) | |
139 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 | 140 | if (qops->peek == NULL) { |
68fd26b5 | 141 | if (qops->dequeue == NULL) |
99c0db26 | 142 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
143 | else |
144 | goto out_einval; | |
99c0db26 | 145 | } |
1da177e4 LT |
146 | if (qops->dequeue == NULL) |
147 | qops->dequeue = noop_qdisc_ops.dequeue; | |
148 | ||
68fd26b5 JP |
149 | if (qops->cl_ops) { |
150 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
151 | ||
143976ce | 152 | if (!(cops->find && cops->walk && cops->leaf)) |
68fd26b5 JP |
153 | goto out_einval; |
154 | ||
6529eaba | 155 | if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf)) |
68fd26b5 JP |
156 | goto out_einval; |
157 | } | |
158 | ||
1da177e4 LT |
159 | qops->next = NULL; |
160 | *qp = qops; | |
161 | rc = 0; | |
162 | out: | |
163 | write_unlock(&qdisc_mod_lock); | |
164 | return rc; | |
68fd26b5 JP |
165 | |
166 | out_einval: | |
167 | rc = -EINVAL; | |
168 | goto out; | |
1da177e4 | 169 | } |
62e3ba1b | 170 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
171 | |
172 | int unregister_qdisc(struct Qdisc_ops *qops) | |
173 | { | |
174 | struct Qdisc_ops *q, **qp; | |
175 | int err = -ENOENT; | |
176 | ||
177 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 178 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
179 | if (q == qops) |
180 | break; | |
181 | if (q) { | |
182 | *qp = q->next; | |
183 | q->next = NULL; | |
184 | err = 0; | |
185 | } | |
186 | write_unlock(&qdisc_mod_lock); | |
187 | return err; | |
188 | } | |
62e3ba1b | 189 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 | 190 | |
6da7c8fc | 191 | /* Get default qdisc if not otherwise specified */ |
192 | void qdisc_get_default(char *name, size_t len) | |
193 | { | |
194 | read_lock(&qdisc_mod_lock); | |
195 | strlcpy(name, default_qdisc_ops->id, len); | |
196 | read_unlock(&qdisc_mod_lock); | |
197 | } | |
198 | ||
199 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) | |
200 | { | |
201 | struct Qdisc_ops *q = NULL; | |
202 | ||
203 | for (q = qdisc_base; q; q = q->next) { | |
204 | if (!strcmp(name, q->id)) { | |
205 | if (!try_module_get(q->owner)) | |
206 | q = NULL; | |
207 | break; | |
208 | } | |
209 | } | |
210 | ||
211 | return q; | |
212 | } | |
213 | ||
214 | /* Set new default qdisc to use */ | |
215 | int qdisc_set_default(const char *name) | |
216 | { | |
217 | const struct Qdisc_ops *ops; | |
218 | ||
219 | if (!capable(CAP_NET_ADMIN)) | |
220 | return -EPERM; | |
221 | ||
222 | write_lock(&qdisc_mod_lock); | |
223 | ops = qdisc_lookup_default(name); | |
224 | if (!ops) { | |
225 | /* Not found, drop lock and try to load module */ | |
226 | write_unlock(&qdisc_mod_lock); | |
227 | request_module("sch_%s", name); | |
228 | write_lock(&qdisc_mod_lock); | |
229 | ||
230 | ops = qdisc_lookup_default(name); | |
231 | } | |
232 | ||
233 | if (ops) { | |
234 | /* Set new default */ | |
235 | module_put(default_qdisc_ops->owner); | |
236 | default_qdisc_ops = ops; | |
237 | } | |
238 | write_unlock(&qdisc_mod_lock); | |
239 | ||
240 | return ops ? 0 : -ENOENT; | |
241 | } | |
242 | ||
8ea3e439 | 243 | #ifdef CONFIG_NET_SCH_DEFAULT |
244 | /* Set default value from kernel config */ | |
245 | static int __init sch_default_qdisc(void) | |
246 | { | |
247 | return qdisc_set_default(CONFIG_DEFAULT_NET_SCH); | |
248 | } | |
249 | late_initcall(sch_default_qdisc); | |
250 | #endif | |
251 | ||
1da177e4 | 252 | /* We know handle. Find qdisc among all qdisc's attached to device |
4eaf3b84 ED |
253 | * (root qdisc, all its children, children of children etc.) |
254 | * Note: caller either uses rtnl or rcu_read_lock() | |
1da177e4 LT |
255 | */ |
256 | ||
6113b748 | 257 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
258 | { |
259 | struct Qdisc *q; | |
260 | ||
69012ae4 JK |
261 | if (!qdisc_dev(root)) |
262 | return (root->handle == handle ? root : NULL); | |
263 | ||
8123b421 DM |
264 | if (!(root->flags & TCQ_F_BUILTIN) && |
265 | root->handle == handle) | |
266 | return root; | |
267 | ||
59cc1f61 | 268 | hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) { |
8123b421 DM |
269 | if (q->handle == handle) |
270 | return q; | |
271 | } | |
272 | return NULL; | |
273 | } | |
274 | ||
49b49971 | 275 | void qdisc_hash_add(struct Qdisc *q, bool invisible) |
f6e0b239 | 276 | { |
37314363 | 277 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
4eaf3b84 | 278 | ASSERT_RTNL(); |
59cc1f61 | 279 | hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle); |
49b49971 JK |
280 | if (invisible) |
281 | q->flags |= TCQ_F_INVISIBLE; | |
37314363 | 282 | } |
f6e0b239 | 283 | } |
59cc1f61 | 284 | EXPORT_SYMBOL(qdisc_hash_add); |
f6e0b239 | 285 | |
59cc1f61 | 286 | void qdisc_hash_del(struct Qdisc *q) |
f6e0b239 | 287 | { |
4eaf3b84 ED |
288 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
289 | ASSERT_RTNL(); | |
59cc1f61 | 290 | hash_del_rcu(&q->hash); |
4eaf3b84 | 291 | } |
f6e0b239 | 292 | } |
59cc1f61 | 293 | EXPORT_SYMBOL(qdisc_hash_del); |
f6e0b239 | 294 | |
ead81cc5 | 295 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 296 | { |
f6e0b239 JP |
297 | struct Qdisc *q; |
298 | ||
50317fce CW |
299 | if (!handle) |
300 | return NULL; | |
af356afa PM |
301 | q = qdisc_match_from_root(dev->qdisc, handle); |
302 | if (q) | |
303 | goto out; | |
f6e0b239 | 304 | |
24824a09 ED |
305 | if (dev_ingress_queue(dev)) |
306 | q = qdisc_match_from_root( | |
307 | dev_ingress_queue(dev)->qdisc_sleeping, | |
308 | handle); | |
f6486d40 | 309 | out: |
f6e0b239 | 310 | return q; |
1da177e4 LT |
311 | } |
312 | ||
3a7d0d07 VB |
313 | struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle) |
314 | { | |
315 | struct netdev_queue *nq; | |
316 | struct Qdisc *q; | |
317 | ||
318 | if (!handle) | |
319 | return NULL; | |
320 | q = qdisc_match_from_root(dev->qdisc, handle); | |
321 | if (q) | |
322 | goto out; | |
323 | ||
324 | nq = dev_ingress_queue_rcu(dev); | |
325 | if (nq) | |
326 | q = qdisc_match_from_root(nq->qdisc_sleeping, handle); | |
327 | out: | |
328 | return q; | |
329 | } | |
330 | ||
1da177e4 LT |
331 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) |
332 | { | |
333 | unsigned long cl; | |
20fea08b | 334 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
335 | |
336 | if (cops == NULL) | |
337 | return NULL; | |
143976ce | 338 | cl = cops->find(p, classid); |
1da177e4 LT |
339 | |
340 | if (cl == 0) | |
341 | return NULL; | |
2561f972 | 342 | return cops->leaf(p, cl); |
1da177e4 LT |
343 | } |
344 | ||
345 | /* Find queueing discipline by name */ | |
346 | ||
1e90474c | 347 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
348 | { |
349 | struct Qdisc_ops *q = NULL; | |
350 | ||
351 | if (kind) { | |
352 | read_lock(&qdisc_mod_lock); | |
353 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 354 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
355 | if (!try_module_get(q->owner)) |
356 | q = NULL; | |
357 | break; | |
358 | } | |
359 | } | |
360 | read_unlock(&qdisc_mod_lock); | |
361 | } | |
362 | return q; | |
363 | } | |
364 | ||
8a8e3d84 JDB |
365 | /* The linklayer setting were not transferred from iproute2, in older |
366 | * versions, and the rate tables lookup systems have been dropped in | |
367 | * the kernel. To keep backward compatible with older iproute2 tc | |
368 | * utils, we detect the linklayer setting by detecting if the rate | |
369 | * table were modified. | |
370 | * | |
371 | * For linklayer ATM table entries, the rate table will be aligned to | |
372 | * 48 bytes, thus some table entries will contain the same value. The | |
373 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
374 | * starting from the mpu, we find low and high table entries for | |
375 | * mapping this cell. If these entries contain the same value, when | |
376 | * the rate tables have been modified for linklayer ATM. | |
377 | * | |
378 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
379 | * and then roundup to the next cell, calc the table entry one below, | |
380 | * and compare. | |
381 | */ | |
382 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
383 | { | |
384 | int low = roundup(r->mpu, 48); | |
385 | int high = roundup(low+1, 48); | |
386 | int cell_low = low >> r->cell_log; | |
387 | int cell_high = (high >> r->cell_log) - 1; | |
388 | ||
389 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
390 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
391 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
392 | return TC_LINKLAYER_ETHERNET; | |
393 | } | |
394 | ||
395 | if ((cell_high > cell_low) && (cell_high < 256) | |
396 | && (rtab[cell_low] == rtab[cell_high])) { | |
397 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
398 | cell_low, cell_high, rtab[cell_high]); | |
399 | return TC_LINKLAYER_ATM; | |
400 | } | |
401 | return TC_LINKLAYER_ETHERNET; | |
402 | } | |
403 | ||
1da177e4 LT |
404 | static struct qdisc_rate_table *qdisc_rtab_list; |
405 | ||
5a7a5555 | 406 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
e9bc3fa2 AA |
407 | struct nlattr *tab, |
408 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
409 | { |
410 | struct qdisc_rate_table *rtab; | |
411 | ||
40edeff6 | 412 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
e9bc3fa2 AA |
413 | nla_len(tab) != TC_RTAB_SIZE) { |
414 | NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching"); | |
40edeff6 | 415 | return NULL; |
e9bc3fa2 | 416 | } |
40edeff6 | 417 | |
1da177e4 | 418 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
419 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
420 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
421 | rtab->refcnt++; |
422 | return rtab; | |
423 | } | |
424 | } | |
425 | ||
1da177e4 LT |
426 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
427 | if (rtab) { | |
428 | rtab->rate = *r; | |
429 | rtab->refcnt = 1; | |
1e90474c | 430 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
431 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
432 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
433 | rtab->next = qdisc_rtab_list; |
434 | qdisc_rtab_list = rtab; | |
e9bc3fa2 AA |
435 | } else { |
436 | NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table"); | |
1da177e4 LT |
437 | } |
438 | return rtab; | |
439 | } | |
62e3ba1b | 440 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
441 | |
442 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
443 | { | |
444 | struct qdisc_rate_table *rtab, **rtabp; | |
445 | ||
446 | if (!tab || --tab->refcnt) | |
447 | return; | |
448 | ||
cc7ec456 ED |
449 | for (rtabp = &qdisc_rtab_list; |
450 | (rtab = *rtabp) != NULL; | |
451 | rtabp = &rtab->next) { | |
1da177e4 LT |
452 | if (rtab == tab) { |
453 | *rtabp = rtab->next; | |
454 | kfree(rtab); | |
455 | return; | |
456 | } | |
457 | } | |
458 | } | |
62e3ba1b | 459 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 460 | |
175f9c1b | 461 | static LIST_HEAD(qdisc_stab_list); |
175f9c1b JK |
462 | |
463 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
464 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
465 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
466 | }; | |
467 | ||
09215598 AA |
468 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt, |
469 | struct netlink_ext_ack *extack) | |
175f9c1b JK |
470 | { |
471 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
472 | struct qdisc_size_table *stab; | |
473 | struct tc_sizespec *s; | |
474 | unsigned int tsize = 0; | |
475 | u16 *tab = NULL; | |
476 | int err; | |
477 | ||
8cb08174 JB |
478 | err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy, |
479 | extack); | |
175f9c1b JK |
480 | if (err < 0) |
481 | return ERR_PTR(err); | |
09215598 AA |
482 | if (!tb[TCA_STAB_BASE]) { |
483 | NL_SET_ERR_MSG(extack, "Size table base attribute is missing"); | |
175f9c1b | 484 | return ERR_PTR(-EINVAL); |
09215598 | 485 | } |
175f9c1b JK |
486 | |
487 | s = nla_data(tb[TCA_STAB_BASE]); | |
488 | ||
489 | if (s->tsize > 0) { | |
09215598 AA |
490 | if (!tb[TCA_STAB_DATA]) { |
491 | NL_SET_ERR_MSG(extack, "Size table data attribute is missing"); | |
175f9c1b | 492 | return ERR_PTR(-EINVAL); |
09215598 | 493 | } |
175f9c1b JK |
494 | tab = nla_data(tb[TCA_STAB_DATA]); |
495 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
496 | } | |
497 | ||
09215598 AA |
498 | if (tsize != s->tsize || (!tab && tsize > 0)) { |
499 | NL_SET_ERR_MSG(extack, "Invalid size of size table"); | |
175f9c1b | 500 | return ERR_PTR(-EINVAL); |
09215598 | 501 | } |
175f9c1b | 502 | |
175f9c1b JK |
503 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
504 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
505 | continue; | |
506 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
507 | continue; | |
508 | stab->refcnt++; | |
175f9c1b JK |
509 | return stab; |
510 | } | |
511 | ||
175f9c1b JK |
512 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); |
513 | if (!stab) | |
514 | return ERR_PTR(-ENOMEM); | |
515 | ||
516 | stab->refcnt = 1; | |
517 | stab->szopts = *s; | |
518 | if (tsize > 0) | |
519 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
520 | ||
175f9c1b | 521 | list_add_tail(&stab->list, &qdisc_stab_list); |
175f9c1b JK |
522 | |
523 | return stab; | |
524 | } | |
525 | ||
526 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
527 | { | |
528 | if (!tab) | |
529 | return; | |
530 | ||
175f9c1b JK |
531 | if (--tab->refcnt == 0) { |
532 | list_del(&tab->list); | |
6e07902f | 533 | kfree_rcu(tab, rcu); |
175f9c1b | 534 | } |
175f9c1b JK |
535 | } |
536 | EXPORT_SYMBOL(qdisc_put_stab); | |
537 | ||
538 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
539 | { | |
540 | struct nlattr *nest; | |
541 | ||
ae0be8de | 542 | nest = nla_nest_start_noflag(skb, TCA_STAB); |
3aa4614d PM |
543 | if (nest == NULL) |
544 | goto nla_put_failure; | |
1b34ec43 DM |
545 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
546 | goto nla_put_failure; | |
175f9c1b JK |
547 | nla_nest_end(skb, nest); |
548 | ||
549 | return skb->len; | |
550 | ||
551 | nla_put_failure: | |
552 | return -1; | |
553 | } | |
554 | ||
5a7a5555 JHS |
555 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
556 | const struct qdisc_size_table *stab) | |
175f9c1b JK |
557 | { |
558 | int pkt_len, slot; | |
559 | ||
560 | pkt_len = skb->len + stab->szopts.overhead; | |
561 | if (unlikely(!stab->szopts.tsize)) | |
562 | goto out; | |
563 | ||
564 | slot = pkt_len + stab->szopts.cell_align; | |
565 | if (unlikely(slot < 0)) | |
566 | slot = 0; | |
567 | ||
568 | slot >>= stab->szopts.cell_log; | |
569 | if (likely(slot < stab->szopts.tsize)) | |
570 | pkt_len = stab->data[slot]; | |
571 | else | |
572 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
573 | (slot / stab->szopts.tsize) + | |
574 | stab->data[slot % stab->szopts.tsize]; | |
575 | ||
576 | pkt_len <<= stab->szopts.size_log; | |
577 | out: | |
578 | if (unlikely(pkt_len < 1)) | |
579 | pkt_len = 1; | |
580 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
581 | } | |
a2da570d | 582 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 583 | |
6e765a00 | 584 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
585 | { |
586 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
587 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
588 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
589 | qdisc->flags |= TCQ_F_WARN_NONWC; |
590 | } | |
591 | } | |
592 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
593 | ||
4179477f PM |
594 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
595 | { | |
596 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 597 | timer); |
4179477f | 598 | |
1e203c1a | 599 | rcu_read_lock(); |
8608db03 | 600 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 601 | rcu_read_unlock(); |
1936502d | 602 | |
4179477f PM |
603 | return HRTIMER_NORESTART; |
604 | } | |
605 | ||
860b642b VCG |
606 | void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc, |
607 | clockid_t clockid) | |
4179477f | 608 | { |
860b642b | 609 | hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 610 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
611 | wd->qdisc = qdisc; |
612 | } | |
860b642b VCG |
613 | EXPORT_SYMBOL(qdisc_watchdog_init_clockid); |
614 | ||
615 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
616 | { | |
617 | qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC); | |
618 | } | |
4179477f PM |
619 | EXPORT_SYMBOL(qdisc_watchdog_init); |
620 | ||
45f50bed | 621 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires) |
4179477f | 622 | { |
2540e051 JP |
623 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
624 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
625 | return; | |
626 | ||
a9efad8b ED |
627 | if (wd->last_expires == expires) |
628 | return; | |
629 | ||
630 | wd->last_expires = expires; | |
46baac38 | 631 | hrtimer_start(&wd->timer, |
34c5d292 | 632 | ns_to_ktime(expires), |
4a8e320c | 633 | HRTIMER_MODE_ABS_PINNED); |
4179477f | 634 | } |
34c5d292 | 635 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
4179477f PM |
636 | |
637 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
638 | { | |
2fbd3da3 | 639 | hrtimer_cancel(&wd->timer); |
4179477f PM |
640 | } |
641 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 642 | |
a94f779f | 643 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 | 644 | { |
6fe1c7a5 | 645 | struct hlist_head *h; |
9695fe6f | 646 | unsigned int i; |
6fe1c7a5 | 647 | |
9695fe6f | 648 | h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL); |
6fe1c7a5 PM |
649 | |
650 | if (h != NULL) { | |
651 | for (i = 0; i < n; i++) | |
652 | INIT_HLIST_HEAD(&h[i]); | |
653 | } | |
654 | return h; | |
655 | } | |
656 | ||
6fe1c7a5 PM |
657 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) |
658 | { | |
659 | struct Qdisc_class_common *cl; | |
b67bfe0d | 660 | struct hlist_node *next; |
6fe1c7a5 PM |
661 | struct hlist_head *nhash, *ohash; |
662 | unsigned int nsize, nmask, osize; | |
663 | unsigned int i, h; | |
664 | ||
665 | /* Rehash when load factor exceeds 0.75 */ | |
666 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
667 | return; | |
668 | nsize = clhash->hashsize * 2; | |
669 | nmask = nsize - 1; | |
670 | nhash = qdisc_class_hash_alloc(nsize); | |
671 | if (nhash == NULL) | |
672 | return; | |
673 | ||
674 | ohash = clhash->hash; | |
675 | osize = clhash->hashsize; | |
676 | ||
677 | sch_tree_lock(sch); | |
678 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 679 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
680 | h = qdisc_class_hash(cl->classid, nmask); |
681 | hlist_add_head(&cl->hnode, &nhash[h]); | |
682 | } | |
683 | } | |
684 | clhash->hash = nhash; | |
685 | clhash->hashsize = nsize; | |
686 | clhash->hashmask = nmask; | |
687 | sch_tree_unlock(sch); | |
688 | ||
9695fe6f | 689 | kvfree(ohash); |
6fe1c7a5 PM |
690 | } |
691 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
692 | ||
693 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
694 | { | |
695 | unsigned int size = 4; | |
696 | ||
697 | clhash->hash = qdisc_class_hash_alloc(size); | |
ac8ef4ab | 698 | if (!clhash->hash) |
6fe1c7a5 PM |
699 | return -ENOMEM; |
700 | clhash->hashsize = size; | |
701 | clhash->hashmask = size - 1; | |
702 | clhash->hashelems = 0; | |
703 | return 0; | |
704 | } | |
705 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
706 | ||
707 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
708 | { | |
9695fe6f | 709 | kvfree(clhash->hash); |
6fe1c7a5 PM |
710 | } |
711 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
712 | ||
713 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
714 | struct Qdisc_class_common *cl) | |
715 | { | |
716 | unsigned int h; | |
717 | ||
718 | INIT_HLIST_NODE(&cl->hnode); | |
719 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
720 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
721 | clhash->hashelems++; | |
722 | } | |
723 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
724 | ||
725 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
726 | struct Qdisc_class_common *cl) | |
727 | { | |
728 | hlist_del(&cl->hnode); | |
729 | clhash->hashelems--; | |
730 | } | |
731 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
732 | ||
fa0f5aa7 ED |
733 | /* Allocate an unique handle from space managed by kernel |
734 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
735 | */ | |
1da177e4 LT |
736 | static u32 qdisc_alloc_handle(struct net_device *dev) |
737 | { | |
fa0f5aa7 | 738 | int i = 0x8000; |
1da177e4 LT |
739 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
740 | ||
741 | do { | |
742 | autohandle += TC_H_MAKE(0x10000U, 0); | |
743 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
744 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
745 | if (!qdisc_lookup(dev, autohandle)) |
746 | return autohandle; | |
747 | cond_resched(); | |
748 | } while (--i > 0); | |
1da177e4 | 749 | |
fa0f5aa7 | 750 | return 0; |
1da177e4 LT |
751 | } |
752 | ||
5f2939d9 | 753 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len) |
43effa1e | 754 | { |
fd5ac14a | 755 | bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED; |
20fea08b | 756 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
757 | unsigned long cl; |
758 | u32 parentid; | |
95946658 | 759 | bool notify; |
2c8c8e6f | 760 | int drops; |
43effa1e | 761 | |
2ccccf5f | 762 | if (n == 0 && len == 0) |
43effa1e | 763 | return; |
2c8c8e6f | 764 | drops = max_t(int, n, 0); |
4eaf3b84 | 765 | rcu_read_lock(); |
43effa1e | 766 | while ((parentid = sch->parent)) { |
066a3b5b | 767 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 768 | break; |
066a3b5b | 769 | |
4eaf3b84 ED |
770 | if (sch->flags & TCQ_F_NOPARENT) |
771 | break; | |
95946658 KK |
772 | /* Notify parent qdisc only if child qdisc becomes empty. |
773 | * | |
774 | * If child was empty even before update then backlog | |
775 | * counter is screwed and we skip notification because | |
776 | * parent class is already passive. | |
fd5ac14a NF |
777 | * |
778 | * If the original child was offloaded then it is allowed | |
779 | * to be seem as empty, so the parent is notified anyway. | |
95946658 | 780 | */ |
fd5ac14a NF |
781 | notify = !sch->q.qlen && !WARN_ON_ONCE(!n && |
782 | !qdisc_is_offloaded); | |
4eaf3b84 | 783 | /* TODO: perform the search on a per txq basis */ |
5ce2d488 | 784 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 785 | if (sch == NULL) { |
4eaf3b84 ED |
786 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
787 | break; | |
ffc8fefa | 788 | } |
43effa1e | 789 | cops = sch->ops->cl_ops; |
95946658 | 790 | if (notify && cops->qlen_notify) { |
143976ce | 791 | cl = cops->find(sch, parentid); |
43effa1e | 792 | cops->qlen_notify(sch, cl); |
43effa1e PM |
793 | } |
794 | sch->q.qlen -= n; | |
2ccccf5f | 795 | sch->qstats.backlog -= len; |
25331d6c | 796 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 797 | } |
4eaf3b84 | 798 | rcu_read_unlock(); |
43effa1e | 799 | } |
2ccccf5f | 800 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
1da177e4 | 801 | |
b592843c JK |
802 | int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type, |
803 | void *type_data) | |
804 | { | |
805 | struct net_device *dev = qdisc_dev(sch); | |
806 | int err; | |
807 | ||
808 | sch->flags &= ~TCQ_F_OFFLOADED; | |
809 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
810 | return 0; | |
811 | ||
812 | err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data); | |
813 | if (err == -EOPNOTSUPP) | |
814 | return 0; | |
815 | ||
816 | if (!err) | |
817 | sch->flags |= TCQ_F_OFFLOADED; | |
818 | ||
819 | return err; | |
820 | } | |
821 | EXPORT_SYMBOL(qdisc_offload_dump_helper); | |
822 | ||
bfaee911 JK |
823 | void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
824 | struct Qdisc *new, struct Qdisc *old, | |
825 | enum tc_setup_type type, void *type_data, | |
826 | struct netlink_ext_ack *extack) | |
827 | { | |
828 | bool any_qdisc_is_offloaded; | |
829 | int err; | |
830 | ||
831 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
832 | return; | |
833 | ||
834 | err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data); | |
835 | ||
836 | /* Don't report error if the graft is part of destroy operation. */ | |
837 | if (!err || !new || new == &noop_qdisc) | |
838 | return; | |
839 | ||
840 | /* Don't report error if the parent, the old child and the new | |
841 | * one are not offloaded. | |
842 | */ | |
843 | any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED; | |
844 | any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED; | |
845 | any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED; | |
846 | ||
847 | if (any_qdisc_is_offloaded) | |
848 | NL_SET_ERR_MSG(extack, "Offloading graft operation failed."); | |
849 | } | |
850 | EXPORT_SYMBOL(qdisc_offload_graft_helper); | |
851 | ||
98b0e5f6 JK |
852 | static void qdisc_offload_graft_root(struct net_device *dev, |
853 | struct Qdisc *new, struct Qdisc *old, | |
854 | struct netlink_ext_ack *extack) | |
855 | { | |
856 | struct tc_root_qopt_offload graft_offload = { | |
857 | .command = TC_ROOT_GRAFT, | |
858 | .handle = new ? new->handle : 0, | |
859 | .ingress = (new && new->flags & TCQ_F_INGRESS) || | |
860 | (old && old->flags & TCQ_F_INGRESS), | |
861 | }; | |
862 | ||
863 | qdisc_offload_graft_helper(dev, NULL, new, old, | |
864 | TC_SETUP_ROOT_QDISC, &graft_offload, extack); | |
865 | } | |
866 | ||
27d7f07c WC |
867 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, |
868 | u32 portid, u32 seq, u16 flags, int event) | |
869 | { | |
870 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; | |
871 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; | |
872 | struct tcmsg *tcm; | |
873 | struct nlmsghdr *nlh; | |
874 | unsigned char *b = skb_tail_pointer(skb); | |
875 | struct gnet_dump d; | |
876 | struct qdisc_size_table *stab; | |
d47a6b0e | 877 | u32 block_index; |
27d7f07c WC |
878 | __u32 qlen; |
879 | ||
880 | cond_resched(); | |
881 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
882 | if (!nlh) | |
883 | goto out_nlmsg_trim; | |
884 | tcm = nlmsg_data(nlh); | |
885 | tcm->tcm_family = AF_UNSPEC; | |
886 | tcm->tcm__pad1 = 0; | |
887 | tcm->tcm__pad2 = 0; | |
888 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
889 | tcm->tcm_parent = clid; | |
890 | tcm->tcm_handle = q->handle; | |
891 | tcm->tcm_info = refcount_read(&q->refcnt); | |
892 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
893 | goto nla_put_failure; | |
d47a6b0e JP |
894 | if (q->ops->ingress_block_get) { |
895 | block_index = q->ops->ingress_block_get(q); | |
896 | if (block_index && | |
897 | nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index)) | |
898 | goto nla_put_failure; | |
899 | } | |
900 | if (q->ops->egress_block_get) { | |
901 | block_index = q->ops->egress_block_get(q); | |
902 | if (block_index && | |
903 | nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index)) | |
904 | goto nla_put_failure; | |
905 | } | |
27d7f07c WC |
906 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
907 | goto nla_put_failure; | |
44edf2f8 NF |
908 | if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED))) |
909 | goto nla_put_failure; | |
7e66016f | 910 | qlen = qdisc_qlen_sum(q); |
27d7f07c WC |
911 | |
912 | stab = rtnl_dereference(q->stab); | |
913 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
914 | goto nla_put_failure; | |
915 | ||
916 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
917 | NULL, &d, TCA_PAD) < 0) | |
918 | goto nla_put_failure; | |
919 | ||
920 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
921 | goto nla_put_failure; | |
922 | ||
923 | if (qdisc_is_percpu_stats(q)) { | |
924 | cpu_bstats = q->cpu_bstats; | |
925 | cpu_qstats = q->cpu_qstats; | |
926 | } | |
927 | ||
928 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q), | |
929 | &d, cpu_bstats, &q->bstats) < 0 || | |
930 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || | |
931 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) | |
932 | goto nla_put_failure; | |
933 | ||
934 | if (gnet_stats_finish_copy(&d) < 0) | |
935 | goto nla_put_failure; | |
936 | ||
937 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
938 | return skb->len; | |
939 | ||
940 | out_nlmsg_trim: | |
941 | nla_put_failure: | |
942 | nlmsg_trim(skb, b); | |
943 | return -1; | |
944 | } | |
945 | ||
946 | static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible) | |
947 | { | |
948 | if (q->flags & TCQ_F_BUILTIN) | |
949 | return true; | |
950 | if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible) | |
951 | return true; | |
952 | ||
953 | return false; | |
954 | } | |
955 | ||
956 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, | |
957 | struct nlmsghdr *n, u32 clid, | |
958 | struct Qdisc *old, struct Qdisc *new) | |
959 | { | |
960 | struct sk_buff *skb; | |
961 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
962 | ||
963 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
964 | if (!skb) | |
965 | return -ENOBUFS; | |
966 | ||
967 | if (old && !tc_qdisc_dump_ignore(old, false)) { | |
968 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, | |
969 | 0, RTM_DELQDISC) < 0) | |
970 | goto err_out; | |
971 | } | |
972 | if (new && !tc_qdisc_dump_ignore(new, false)) { | |
973 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, | |
974 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
975 | goto err_out; | |
976 | } | |
977 | ||
978 | if (skb->len) | |
979 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
980 | n->nlmsg_flags & NLM_F_ECHO); | |
981 | ||
982 | err_out: | |
983 | kfree_skb(skb); | |
984 | return -EINVAL; | |
985 | } | |
986 | ||
7316ae88 TG |
987 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
988 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
989 | struct Qdisc *old, struct Qdisc *new) |
990 | { | |
991 | if (new || old) | |
7316ae88 | 992 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 993 | |
4d8863a2 | 994 | if (old) |
86bd446b | 995 | qdisc_put(old); |
99194cff DM |
996 | } |
997 | ||
8a53e616 PA |
998 | static void qdisc_clear_nolock(struct Qdisc *sch) |
999 | { | |
1000 | sch->flags &= ~TCQ_F_NOLOCK; | |
1001 | if (!(sch->flags & TCQ_F_CPUSTATS)) | |
1002 | return; | |
1003 | ||
1004 | free_percpu(sch->cpu_bstats); | |
1005 | free_percpu(sch->cpu_qstats); | |
1006 | sch->cpu_bstats = NULL; | |
1007 | sch->cpu_qstats = NULL; | |
1008 | sch->flags &= ~TCQ_F_CPUSTATS; | |
1009 | } | |
1010 | ||
99194cff DM |
1011 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or |
1012 | * to device "dev". | |
1013 | * | |
1014 | * When appropriate send a netlink notification using 'skb' | |
1015 | * and "n". | |
1016 | * | |
1017 | * On success, destroy old qdisc. | |
1da177e4 LT |
1018 | */ |
1019 | ||
1020 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff | 1021 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
09215598 AA |
1022 | struct Qdisc *new, struct Qdisc *old, |
1023 | struct netlink_ext_ack *extack) | |
1da177e4 | 1024 | { |
99194cff | 1025 | struct Qdisc *q = old; |
7316ae88 | 1026 | struct net *net = dev_net(dev); |
1da177e4 | 1027 | |
10297b99 | 1028 | if (parent == NULL) { |
99194cff DM |
1029 | unsigned int i, num_q, ingress; |
1030 | ||
1031 | ingress = 0; | |
1032 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
1033 | if ((q && q->flags & TCQ_F_INGRESS) || |
1034 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
1035 | num_q = 1; |
1036 | ingress = 1; | |
09215598 AA |
1037 | if (!dev_ingress_queue(dev)) { |
1038 | NL_SET_ERR_MSG(extack, "Device does not have an ingress queue"); | |
24824a09 | 1039 | return -ENOENT; |
09215598 | 1040 | } |
99194cff DM |
1041 | } |
1042 | ||
1043 | if (dev->flags & IFF_UP) | |
1044 | dev_deactivate(dev); | |
1045 | ||
98b0e5f6 JK |
1046 | qdisc_offload_graft_root(dev, new, old, extack); |
1047 | ||
86e363dc WC |
1048 | if (new && new->ops->attach) |
1049 | goto skip; | |
6ec1c69a | 1050 | |
99194cff | 1051 | for (i = 0; i < num_q; i++) { |
24824a09 | 1052 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
1053 | |
1054 | if (!ingress) | |
1055 | dev_queue = netdev_get_tx_queue(dev, i); | |
1056 | ||
8d50b53d DM |
1057 | old = dev_graft_qdisc(dev_queue, new); |
1058 | if (new && i > 0) | |
551143d8 | 1059 | qdisc_refcount_inc(new); |
8d50b53d | 1060 | |
036d6a67 | 1061 | if (!ingress) |
86bd446b | 1062 | qdisc_put(old); |
1da177e4 | 1063 | } |
99194cff | 1064 | |
86e363dc | 1065 | skip: |
036d6a67 | 1066 | if (!ingress) { |
7316ae88 TG |
1067 | notify_and_destroy(net, skb, n, classid, |
1068 | dev->qdisc, new); | |
036d6a67 | 1069 | if (new && !new->ops->attach) |
551143d8 | 1070 | qdisc_refcount_inc(new); |
036d6a67 | 1071 | dev->qdisc = new ? : &noop_qdisc; |
86e363dc WC |
1072 | |
1073 | if (new && new->ops->attach) | |
1074 | new->ops->attach(new); | |
036d6a67 | 1075 | } else { |
7316ae88 | 1076 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 1077 | } |
af356afa | 1078 | |
99194cff DM |
1079 | if (dev->flags & IFF_UP) |
1080 | dev_activate(dev); | |
1da177e4 | 1081 | } else { |
20fea08b | 1082 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
9da93ece JK |
1083 | unsigned long cl; |
1084 | int err; | |
1da177e4 | 1085 | |
c5ad119f JF |
1086 | /* Only support running class lockless if parent is lockless */ |
1087 | if (new && (new->flags & TCQ_F_NOLOCK) && | |
1088 | parent && !(parent->flags & TCQ_F_NOLOCK)) | |
8a53e616 | 1089 | qdisc_clear_nolock(new); |
c5ad119f | 1090 | |
9da93ece JK |
1091 | if (!cops || !cops->graft) |
1092 | return -EOPNOTSUPP; | |
143976ce | 1093 | |
9da93ece JK |
1094 | cl = cops->find(parent, classid); |
1095 | if (!cl) { | |
1096 | NL_SET_ERR_MSG(extack, "Specified class not found"); | |
1097 | return -ENOENT; | |
1da177e4 | 1098 | } |
9da93ece JK |
1099 | |
1100 | err = cops->graft(parent, cl, new, &old, extack); | |
1101 | if (err) | |
1102 | return err; | |
1103 | notify_and_destroy(net, skb, n, classid, old, new); | |
1da177e4 | 1104 | } |
9da93ece | 1105 | return 0; |
1da177e4 LT |
1106 | } |
1107 | ||
d47a6b0e JP |
1108 | static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca, |
1109 | struct netlink_ext_ack *extack) | |
1110 | { | |
1111 | u32 block_index; | |
1112 | ||
1113 | if (tca[TCA_INGRESS_BLOCK]) { | |
1114 | block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]); | |
1115 | ||
1116 | if (!block_index) { | |
1117 | NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0"); | |
1118 | return -EINVAL; | |
1119 | } | |
1120 | if (!sch->ops->ingress_block_set) { | |
1121 | NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported"); | |
1122 | return -EOPNOTSUPP; | |
1123 | } | |
1124 | sch->ops->ingress_block_set(sch, block_index); | |
1125 | } | |
1126 | if (tca[TCA_EGRESS_BLOCK]) { | |
1127 | block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]); | |
1128 | ||
1129 | if (!block_index) { | |
1130 | NL_SET_ERR_MSG(extack, "Egress block index cannot be 0"); | |
1131 | return -EINVAL; | |
1132 | } | |
1133 | if (!sch->ops->egress_block_set) { | |
1134 | NL_SET_ERR_MSG(extack, "Egress block sharing is not supported"); | |
1135 | return -EOPNOTSUPP; | |
1136 | } | |
1137 | sch->ops->egress_block_set(sch, block_index); | |
1138 | } | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1da177e4 LT |
1142 | /* |
1143 | Allocate and initialize new qdisc. | |
1144 | ||
1145 | Parameters are passed via opt. | |
1146 | */ | |
1147 | ||
5a7a5555 JHS |
1148 | static struct Qdisc *qdisc_create(struct net_device *dev, |
1149 | struct netdev_queue *dev_queue, | |
1150 | struct Qdisc *p, u32 parent, u32 handle, | |
09215598 AA |
1151 | struct nlattr **tca, int *errp, |
1152 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1153 | { |
1154 | int err; | |
1e90474c | 1155 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
1156 | struct Qdisc *sch; |
1157 | struct Qdisc_ops *ops; | |
175f9c1b | 1158 | struct qdisc_size_table *stab; |
1da177e4 LT |
1159 | |
1160 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 1161 | #ifdef CONFIG_MODULES |
1da177e4 LT |
1162 | if (ops == NULL && kind != NULL) { |
1163 | char name[IFNAMSIZ]; | |
1e90474c | 1164 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
1165 | /* We dropped the RTNL semaphore in order to |
1166 | * perform the module load. So, even if we | |
1167 | * succeeded in loading the module we have to | |
1168 | * tell the caller to replay the request. We | |
1169 | * indicate this using -EAGAIN. | |
1170 | * We replay the request because the device may | |
1171 | * go away in the mean time. | |
1172 | */ | |
1173 | rtnl_unlock(); | |
1174 | request_module("sch_%s", name); | |
1175 | rtnl_lock(); | |
1176 | ops = qdisc_lookup_ops(kind); | |
1177 | if (ops != NULL) { | |
1178 | /* We will try again qdisc_lookup_ops, | |
1179 | * so don't keep a reference. | |
1180 | */ | |
1181 | module_put(ops->owner); | |
1182 | err = -EAGAIN; | |
1183 | goto err_out; | |
1184 | } | |
1185 | } | |
1186 | } | |
1187 | #endif | |
1188 | ||
b9e2cc0f | 1189 | err = -ENOENT; |
09215598 AA |
1190 | if (!ops) { |
1191 | NL_SET_ERR_MSG(extack, "Specified qdisc not found"); | |
1da177e4 | 1192 | goto err_out; |
09215598 | 1193 | } |
1da177e4 | 1194 | |
d0bd684d | 1195 | sch = qdisc_alloc(dev_queue, ops, extack); |
3d54b82f TG |
1196 | if (IS_ERR(sch)) { |
1197 | err = PTR_ERR(sch); | |
1da177e4 | 1198 | goto err_out2; |
3d54b82f | 1199 | } |
1da177e4 | 1200 | |
ffc8fefa PM |
1201 | sch->parent = parent; |
1202 | ||
3d54b82f | 1203 | if (handle == TC_H_INGRESS) { |
1da177e4 | 1204 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 1205 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
fd44de7c | 1206 | } else { |
fd44de7c PM |
1207 | if (handle == 0) { |
1208 | handle = qdisc_alloc_handle(dev); | |
aaeb1dea IV |
1209 | if (handle == 0) { |
1210 | NL_SET_ERR_MSG(extack, "Maximum number of qdisc handles was exceeded"); | |
1211 | err = -ENOSPC; | |
fd44de7c | 1212 | goto err_out3; |
aaeb1dea | 1213 | } |
fd44de7c | 1214 | } |
1abbe139 | 1215 | if (!netif_is_multiqueue(dev)) |
225734de | 1216 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
1217 | } |
1218 | ||
3d54b82f | 1219 | sch->handle = handle; |
1da177e4 | 1220 | |
84c46dd8 JDB |
1221 | /* This exist to keep backward compatible with a userspace |
1222 | * loophole, what allowed userspace to get IFF_NO_QUEUE | |
1223 | * facility on older kernels by setting tx_queue_len=0 (prior | |
1224 | * to qdisc init), and then forgot to reinit tx_queue_len | |
1225 | * before again attaching a qdisc. | |
1226 | */ | |
1227 | if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { | |
1228 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; | |
1229 | netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); | |
1230 | } | |
1231 | ||
d47a6b0e JP |
1232 | err = qdisc_block_indexes_set(sch, tca, extack); |
1233 | if (err) | |
1234 | goto err_out3; | |
1235 | ||
54160ef6 | 1236 | if (ops->init) { |
e63d7dfd | 1237 | err = ops->init(sch, tca[TCA_OPTIONS], extack); |
54160ef6 AA |
1238 | if (err != 0) |
1239 | goto err_out5; | |
1240 | } | |
22e0f8b9 | 1241 | |
54160ef6 | 1242 | if (tca[TCA_STAB]) { |
09215598 | 1243 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
54160ef6 AA |
1244 | if (IS_ERR(stab)) { |
1245 | err = PTR_ERR(stab); | |
1246 | goto err_out4; | |
023e09a7 | 1247 | } |
54160ef6 AA |
1248 | rcu_assign_pointer(sch->stab, stab); |
1249 | } | |
1250 | if (tca[TCA_RATE]) { | |
1251 | seqcount_t *running; | |
f6e0b239 | 1252 | |
54160ef6 | 1253 | err = -EOPNOTSUPP; |
09215598 AA |
1254 | if (sch->flags & TCQ_F_MQROOT) { |
1255 | NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc"); | |
54160ef6 | 1256 | goto err_out4; |
09215598 | 1257 | } |
1da177e4 | 1258 | |
54160ef6 AA |
1259 | if (sch->parent != TC_H_ROOT && |
1260 | !(sch->flags & TCQ_F_INGRESS) && | |
1261 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
1262 | running = qdisc_root_sleeping_running(sch); | |
1263 | else | |
1264 | running = &sch->running; | |
1265 | ||
1266 | err = gen_new_estimator(&sch->bstats, | |
1267 | sch->cpu_bstats, | |
1268 | &sch->rate_est, | |
1269 | NULL, | |
1270 | running, | |
1271 | tca[TCA_RATE]); | |
09215598 AA |
1272 | if (err) { |
1273 | NL_SET_ERR_MSG(extack, "Failed to generate new estimator"); | |
54160ef6 | 1274 | goto err_out4; |
09215598 | 1275 | } |
1da177e4 | 1276 | } |
54160ef6 AA |
1277 | |
1278 | qdisc_hash_add(sch, false); | |
1279 | ||
1280 | return sch; | |
1281 | ||
1282 | err_out5: | |
87b60cfa | 1283 | /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ |
c1a4872e GF |
1284 | if (ops->destroy) |
1285 | ops->destroy(sch); | |
1da177e4 LT |
1286 | err_out3: |
1287 | dev_put(dev); | |
81d947e2 | 1288 | qdisc_free(sch); |
1da177e4 LT |
1289 | err_out2: |
1290 | module_put(ops->owner); | |
1291 | err_out: | |
1292 | *errp = err; | |
1da177e4 | 1293 | return NULL; |
23bcf634 PM |
1294 | |
1295 | err_out4: | |
1296 | /* | |
1297 | * Any broken qdiscs that would require a ops->reset() here? | |
1298 | * The qdisc was never in action so it shouldn't be necessary. | |
1299 | */ | |
a2da570d | 1300 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1301 | if (ops->destroy) |
1302 | ops->destroy(sch); | |
1303 | goto err_out3; | |
1da177e4 LT |
1304 | } |
1305 | ||
09215598 AA |
1306 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca, |
1307 | struct netlink_ext_ack *extack) | |
1da177e4 | 1308 | { |
a2da570d | 1309 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1310 | int err = 0; |
1da177e4 | 1311 | |
175f9c1b | 1312 | if (tca[TCA_OPTIONS]) { |
09215598 AA |
1313 | if (!sch->ops->change) { |
1314 | NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc"); | |
1da177e4 | 1315 | return -EINVAL; |
09215598 | 1316 | } |
d47a6b0e JP |
1317 | if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) { |
1318 | NL_SET_ERR_MSG(extack, "Change of blocks is not supported"); | |
1319 | return -EOPNOTSUPP; | |
1320 | } | |
2030721c | 1321 | err = sch->ops->change(sch, tca[TCA_OPTIONS], extack); |
1da177e4 LT |
1322 | if (err) |
1323 | return err; | |
1324 | } | |
175f9c1b JK |
1325 | |
1326 | if (tca[TCA_STAB]) { | |
09215598 | 1327 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
175f9c1b JK |
1328 | if (IS_ERR(stab)) |
1329 | return PTR_ERR(stab); | |
1330 | } | |
1331 | ||
a2da570d ED |
1332 | ostab = rtnl_dereference(sch->stab); |
1333 | rcu_assign_pointer(sch->stab, stab); | |
1334 | qdisc_put_stab(ostab); | |
175f9c1b | 1335 | |
23bcf634 | 1336 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1337 | /* NB: ignores errors from replace_estimator |
1338 | because change can't be undone. */ | |
23bcf634 PM |
1339 | if (sch->flags & TCQ_F_MQROOT) |
1340 | goto out; | |
22e0f8b9 JF |
1341 | gen_replace_estimator(&sch->bstats, |
1342 | sch->cpu_bstats, | |
1343 | &sch->rate_est, | |
edb09eb1 ED |
1344 | NULL, |
1345 | qdisc_root_sleeping_running(sch), | |
22e0f8b9 | 1346 | tca[TCA_RATE]); |
23bcf634 PM |
1347 | } |
1348 | out: | |
1da177e4 LT |
1349 | return 0; |
1350 | } | |
1351 | ||
cc7ec456 ED |
1352 | struct check_loop_arg { |
1353 | struct qdisc_walker w; | |
1da177e4 LT |
1354 | struct Qdisc *p; |
1355 | int depth; | |
1356 | }; | |
1357 | ||
5a7a5555 JHS |
1358 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, |
1359 | struct qdisc_walker *w); | |
1da177e4 LT |
1360 | |
1361 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1362 | { | |
1363 | struct check_loop_arg arg; | |
1364 | ||
1365 | if (q->ops->cl_ops == NULL) | |
1366 | return 0; | |
1367 | ||
1368 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1369 | arg.w.fn = check_loop_fn; | |
1370 | arg.depth = depth; | |
1371 | arg.p = p; | |
1372 | q->ops->cl_ops->walk(q, &arg.w); | |
1373 | return arg.w.stop ? -ELOOP : 0; | |
1374 | } | |
1375 | ||
1376 | static int | |
1377 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1378 | { | |
1379 | struct Qdisc *leaf; | |
20fea08b | 1380 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1381 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1382 | ||
1383 | leaf = cops->leaf(q, cl); | |
1384 | if (leaf) { | |
1385 | if (leaf == arg->p || arg->depth > 7) | |
1386 | return -ELOOP; | |
1387 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1388 | } | |
1389 | return 0; | |
1390 | } | |
1391 | ||
8b4c3cdd DA |
1392 | const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = { |
1393 | [TCA_KIND] = { .type = NLA_STRING }, | |
8b4c3cdd DA |
1394 | [TCA_RATE] = { .type = NLA_BINARY, |
1395 | .len = sizeof(struct tc_estimator) }, | |
1396 | [TCA_STAB] = { .type = NLA_NESTED }, | |
1397 | [TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG }, | |
1398 | [TCA_CHAIN] = { .type = NLA_U32 }, | |
1399 | [TCA_INGRESS_BLOCK] = { .type = NLA_U32 }, | |
1400 | [TCA_EGRESS_BLOCK] = { .type = NLA_U32 }, | |
1401 | }; | |
1402 | ||
e331473f DC |
1403 | /* |
1404 | * Delete/get qdisc. | |
1405 | */ | |
1406 | ||
c21ef3e3 DA |
1407 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1408 | struct netlink_ext_ack *extack) | |
1da177e4 | 1409 | { |
3b1e0a65 | 1410 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1411 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1412 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1413 | struct net_device *dev; |
de179c8c | 1414 | u32 clid; |
1da177e4 LT |
1415 | struct Qdisc *q = NULL; |
1416 | struct Qdisc *p = NULL; | |
1417 | int err; | |
1418 | ||
4e8bbb81 | 1419 | if ((n->nlmsg_type != RTM_GETQDISC) && |
5f013c9b | 1420 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1421 | return -EPERM; |
1422 | ||
8cb08174 JB |
1423 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1424 | rtm_tca_policy, extack); | |
1e90474c PM |
1425 | if (err < 0) |
1426 | return err; | |
1427 | ||
de179c8c H |
1428 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1429 | if (!dev) | |
1430 | return -ENODEV; | |
1431 | ||
1432 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1433 | if (clid) { |
1434 | if (clid != TC_H_ROOT) { | |
1435 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 | 1436 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1437 | if (!p) { |
1438 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid"); | |
1da177e4 | 1439 | return -ENOENT; |
09215598 | 1440 | } |
1da177e4 | 1441 | q = qdisc_leaf(p, clid); |
cc7ec456 ED |
1442 | } else if (dev_ingress_queue(dev)) { |
1443 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1444 | } |
1da177e4 | 1445 | } else { |
af356afa | 1446 | q = dev->qdisc; |
1da177e4 | 1447 | } |
09215598 AA |
1448 | if (!q) { |
1449 | NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device"); | |
1da177e4 | 1450 | return -ENOENT; |
09215598 | 1451 | } |
1da177e4 | 1452 | |
09215598 AA |
1453 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) { |
1454 | NL_SET_ERR_MSG(extack, "Invalid handle"); | |
1da177e4 | 1455 | return -EINVAL; |
09215598 | 1456 | } |
1da177e4 | 1457 | } else { |
cc7ec456 | 1458 | q = qdisc_lookup(dev, tcm->tcm_handle); |
09215598 AA |
1459 | if (!q) { |
1460 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle"); | |
1da177e4 | 1461 | return -ENOENT; |
09215598 | 1462 | } |
1da177e4 LT |
1463 | } |
1464 | ||
09215598 AA |
1465 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1466 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1467 | return -EINVAL; |
09215598 | 1468 | } |
1da177e4 LT |
1469 | |
1470 | if (n->nlmsg_type == RTM_DELQDISC) { | |
09215598 AA |
1471 | if (!clid) { |
1472 | NL_SET_ERR_MSG(extack, "Classid cannot be zero"); | |
1da177e4 | 1473 | return -EINVAL; |
09215598 AA |
1474 | } |
1475 | if (q->handle == 0) { | |
1476 | NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero"); | |
1da177e4 | 1477 | return -ENOENT; |
09215598 AA |
1478 | } |
1479 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack); | |
cc7ec456 | 1480 | if (err != 0) |
1da177e4 | 1481 | return err; |
1da177e4 | 1482 | } else { |
7316ae88 | 1483 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1484 | } |
1485 | return 0; | |
1486 | } | |
1487 | ||
1488 | /* | |
cc7ec456 | 1489 | * Create/change qdisc. |
1da177e4 LT |
1490 | */ |
1491 | ||
c21ef3e3 DA |
1492 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1493 | struct netlink_ext_ack *extack) | |
1da177e4 | 1494 | { |
3b1e0a65 | 1495 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1496 | struct tcmsg *tcm; |
1e90474c | 1497 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1498 | struct net_device *dev; |
1499 | u32 clid; | |
1500 | struct Qdisc *q, *p; | |
1501 | int err; | |
1502 | ||
5f013c9b | 1503 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1504 | return -EPERM; |
1505 | ||
1da177e4 LT |
1506 | replay: |
1507 | /* Reinit, just in case something touches this. */ | |
8cb08174 JB |
1508 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1509 | rtm_tca_policy, extack); | |
de179c8c H |
1510 | if (err < 0) |
1511 | return err; | |
1512 | ||
02ef22ca | 1513 | tcm = nlmsg_data(n); |
1da177e4 LT |
1514 | clid = tcm->tcm_parent; |
1515 | q = p = NULL; | |
1516 | ||
cc7ec456 ED |
1517 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1518 | if (!dev) | |
1da177e4 LT |
1519 | return -ENODEV; |
1520 | ||
1e90474c | 1521 | |
1da177e4 LT |
1522 | if (clid) { |
1523 | if (clid != TC_H_ROOT) { | |
1524 | if (clid != TC_H_INGRESS) { | |
cc7ec456 | 1525 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1526 | if (!p) { |
1527 | NL_SET_ERR_MSG(extack, "Failed to find specified qdisc"); | |
1da177e4 | 1528 | return -ENOENT; |
09215598 | 1529 | } |
1da177e4 | 1530 | q = qdisc_leaf(p, clid); |
cc7ec456 ED |
1531 | } else if (dev_ingress_queue_create(dev)) { |
1532 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1533 | } |
1534 | } else { | |
af356afa | 1535 | q = dev->qdisc; |
1da177e4 LT |
1536 | } |
1537 | ||
1538 | /* It may be default qdisc, ignore it */ | |
1539 | if (q && q->handle == 0) | |
1540 | q = NULL; | |
1541 | ||
1542 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1543 | if (tcm->tcm_handle) { | |
09215598 AA |
1544 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) { |
1545 | NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override"); | |
1da177e4 | 1546 | return -EEXIST; |
09215598 AA |
1547 | } |
1548 | if (TC_H_MIN(tcm->tcm_handle)) { | |
1549 | NL_SET_ERR_MSG(extack, "Invalid minor handle"); | |
1da177e4 | 1550 | return -EINVAL; |
09215598 | 1551 | } |
cc7ec456 | 1552 | q = qdisc_lookup(dev, tcm->tcm_handle); |
8ec69574 | 1553 | if (!q) |
1da177e4 | 1554 | goto create_n_graft; |
09215598 AA |
1555 | if (n->nlmsg_flags & NLM_F_EXCL) { |
1556 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override"); | |
1da177e4 | 1557 | return -EEXIST; |
09215598 | 1558 | } |
0ac4bd68 | 1559 | if (tca[TCA_KIND] && |
09215598 AA |
1560 | nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1561 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1562 | return -EINVAL; |
09215598 | 1563 | } |
1da177e4 | 1564 | if (q == p || |
09215598 AA |
1565 | (p && check_loop(q, p, 0))) { |
1566 | NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected"); | |
1da177e4 | 1567 | return -ELOOP; |
09215598 | 1568 | } |
551143d8 | 1569 | qdisc_refcount_inc(q); |
1da177e4 LT |
1570 | goto graft; |
1571 | } else { | |
cc7ec456 | 1572 | if (!q) |
1da177e4 LT |
1573 | goto create_n_graft; |
1574 | ||
1575 | /* This magic test requires explanation. | |
1576 | * | |
1577 | * We know, that some child q is already | |
1578 | * attached to this parent and have choice: | |
1579 | * either to change it or to create/graft new one. | |
1580 | * | |
1581 | * 1. We are allowed to create/graft only | |
1582 | * if CREATE and REPLACE flags are set. | |
1583 | * | |
1584 | * 2. If EXCL is set, requestor wanted to say, | |
1585 | * that qdisc tcm_handle is not expected | |
1586 | * to exist, so that we choose create/graft too. | |
1587 | * | |
1588 | * 3. The last case is when no flags are set. | |
1589 | * Alas, it is sort of hole in API, we | |
1590 | * cannot decide what to do unambiguously. | |
1591 | * For now we select create/graft, if | |
1592 | * user gave KIND, which does not match existing. | |
1593 | */ | |
cc7ec456 ED |
1594 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1595 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1596 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1597 | (tca[TCA_KIND] && |
1598 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1599 | goto create_n_graft; |
1600 | } | |
1601 | } | |
1602 | } else { | |
09215598 AA |
1603 | if (!tcm->tcm_handle) { |
1604 | NL_SET_ERR_MSG(extack, "Handle cannot be zero"); | |
1da177e4 | 1605 | return -EINVAL; |
09215598 | 1606 | } |
1da177e4 LT |
1607 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1608 | } | |
1609 | ||
1610 | /* Change qdisc parameters */ | |
09215598 AA |
1611 | if (!q) { |
1612 | NL_SET_ERR_MSG(extack, "Specified qdisc not found"); | |
1da177e4 | 1613 | return -ENOENT; |
09215598 AA |
1614 | } |
1615 | if (n->nlmsg_flags & NLM_F_EXCL) { | |
1616 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify"); | |
1da177e4 | 1617 | return -EEXIST; |
09215598 AA |
1618 | } |
1619 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { | |
1620 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1621 | return -EINVAL; |
09215598 AA |
1622 | } |
1623 | err = qdisc_change(q, tca, extack); | |
1da177e4 | 1624 | if (err == 0) |
7316ae88 | 1625 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1626 | return err; |
1627 | ||
1628 | create_n_graft: | |
09215598 AA |
1629 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
1630 | NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag"); | |
1da177e4 | 1631 | return -ENOENT; |
09215598 | 1632 | } |
24824a09 | 1633 | if (clid == TC_H_INGRESS) { |
09215598 | 1634 | if (dev_ingress_queue(dev)) { |
24824a09 ED |
1635 | q = qdisc_create(dev, dev_ingress_queue(dev), p, |
1636 | tcm->tcm_parent, tcm->tcm_parent, | |
09215598 AA |
1637 | tca, &err, extack); |
1638 | } else { | |
1639 | NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device"); | |
24824a09 | 1640 | err = -ENOENT; |
09215598 | 1641 | } |
24824a09 | 1642 | } else { |
926e61b7 | 1643 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1644 | |
1645 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1646 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1647 | else if (p) | |
1648 | dev_queue = p->dev_queue; | |
1649 | else | |
1650 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1651 | |
926e61b7 | 1652 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1653 | tcm->tcm_parent, tcm->tcm_handle, |
09215598 | 1654 | tca, &err, extack); |
6ec1c69a | 1655 | } |
1da177e4 LT |
1656 | if (q == NULL) { |
1657 | if (err == -EAGAIN) | |
1658 | goto replay; | |
1659 | return err; | |
1660 | } | |
1661 | ||
1662 | graft: | |
09215598 | 1663 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack); |
e5befbd9 IJ |
1664 | if (err) { |
1665 | if (q) | |
86bd446b | 1666 | qdisc_put(q); |
e5befbd9 | 1667 | return err; |
1da177e4 | 1668 | } |
e5befbd9 | 1669 | |
1da177e4 LT |
1670 | return 0; |
1671 | } | |
1672 | ||
30723673 DM |
1673 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1674 | struct netlink_callback *cb, | |
49b49971 JK |
1675 | int *q_idx_p, int s_q_idx, bool recur, |
1676 | bool dump_invisible) | |
30723673 DM |
1677 | { |
1678 | int ret = 0, q_idx = *q_idx_p; | |
1679 | struct Qdisc *q; | |
59cc1f61 | 1680 | int b; |
30723673 DM |
1681 | |
1682 | if (!root) | |
1683 | return 0; | |
1684 | ||
1685 | q = root; | |
1686 | if (q_idx < s_q_idx) { | |
1687 | q_idx++; | |
1688 | } else { | |
49b49971 | 1689 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1690 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1691 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1692 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1693 | goto done; |
1694 | q_idx++; | |
1695 | } | |
69012ae4 | 1696 | |
ea327469 JK |
1697 | /* If dumping singletons, there is no qdisc_dev(root) and the singleton |
1698 | * itself has already been dumped. | |
1699 | * | |
1700 | * If we've already dumped the top-level (ingress) qdisc above and the global | |
1701 | * qdisc hashtable, we don't want to hit it again | |
1702 | */ | |
1703 | if (!qdisc_dev(root) || !recur) | |
69012ae4 JK |
1704 | goto out; |
1705 | ||
59cc1f61 | 1706 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1707 | if (q_idx < s_q_idx) { |
1708 | q_idx++; | |
1709 | continue; | |
1710 | } | |
49b49971 | 1711 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1712 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1713 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1714 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1715 | goto done; |
1716 | q_idx++; | |
1717 | } | |
1718 | ||
1719 | out: | |
1720 | *q_idx_p = q_idx; | |
1721 | return ret; | |
1722 | done: | |
1723 | ret = -1; | |
1724 | goto out; | |
1725 | } | |
1726 | ||
1da177e4 LT |
1727 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1728 | { | |
3b1e0a65 | 1729 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1730 | int idx, q_idx; |
1731 | int s_idx, s_q_idx; | |
1732 | struct net_device *dev; | |
49b49971 | 1733 | const struct nlmsghdr *nlh = cb->nlh; |
49b49971 JK |
1734 | struct nlattr *tca[TCA_MAX + 1]; |
1735 | int err; | |
1da177e4 LT |
1736 | |
1737 | s_idx = cb->args[0]; | |
1738 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1739 | |
7562f876 | 1740 | idx = 0; |
15dc36eb | 1741 | ASSERT_RTNL(); |
49b49971 | 1742 | |
8cb08174 JB |
1743 | err = nlmsg_parse_deprecated(nlh, sizeof(struct tcmsg), tca, TCA_MAX, |
1744 | rtm_tca_policy, cb->extack); | |
49b49971 JK |
1745 | if (err < 0) |
1746 | return err; | |
1747 | ||
15dc36eb | 1748 | for_each_netdev(net, dev) { |
30723673 DM |
1749 | struct netdev_queue *dev_queue; |
1750 | ||
1da177e4 | 1751 | if (idx < s_idx) |
7562f876 | 1752 | goto cont; |
1da177e4 LT |
1753 | if (idx > s_idx) |
1754 | s_q_idx = 0; | |
1da177e4 | 1755 | q_idx = 0; |
30723673 | 1756 | |
5a7a5555 | 1757 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx, |
49b49971 | 1758 | true, tca[TCA_DUMP_INVISIBLE]) < 0) |
30723673 DM |
1759 | goto done; |
1760 | ||
24824a09 ED |
1761 | dev_queue = dev_ingress_queue(dev); |
1762 | if (dev_queue && | |
1763 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
49b49971 JK |
1764 | &q_idx, s_q_idx, false, |
1765 | tca[TCA_DUMP_INVISIBLE]) < 0) | |
30723673 DM |
1766 | goto done; |
1767 | ||
7562f876 PE |
1768 | cont: |
1769 | idx++; | |
1da177e4 LT |
1770 | } |
1771 | ||
1772 | done: | |
1da177e4 LT |
1773 | cb->args[0] = idx; |
1774 | cb->args[1] = q_idx; | |
1775 | ||
1776 | return skb->len; | |
1777 | } | |
1778 | ||
1779 | ||
1780 | ||
1781 | /************************************************ | |
1782 | * Traffic classes manipulation. * | |
1783 | ************************************************/ | |
1784 | ||
27d7f07c WC |
1785 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, |
1786 | unsigned long cl, | |
1787 | u32 portid, u32 seq, u16 flags, int event) | |
1788 | { | |
1789 | struct tcmsg *tcm; | |
1790 | struct nlmsghdr *nlh; | |
1791 | unsigned char *b = skb_tail_pointer(skb); | |
1792 | struct gnet_dump d; | |
1793 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; | |
1da177e4 | 1794 | |
27d7f07c WC |
1795 | cond_resched(); |
1796 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1797 | if (!nlh) | |
1798 | goto out_nlmsg_trim; | |
1799 | tcm = nlmsg_data(nlh); | |
1800 | tcm->tcm_family = AF_UNSPEC; | |
1801 | tcm->tcm__pad1 = 0; | |
1802 | tcm->tcm__pad2 = 0; | |
1803 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1804 | tcm->tcm_parent = q->handle; | |
1805 | tcm->tcm_handle = q->handle; | |
1806 | tcm->tcm_info = 0; | |
1807 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
1808 | goto nla_put_failure; | |
1809 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) | |
1810 | goto nla_put_failure; | |
1811 | ||
1812 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
1813 | NULL, &d, TCA_PAD) < 0) | |
1814 | goto nla_put_failure; | |
1815 | ||
1816 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1817 | goto nla_put_failure; | |
1818 | ||
1819 | if (gnet_stats_finish_copy(&d) < 0) | |
1820 | goto nla_put_failure; | |
1821 | ||
1822 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1823 | return skb->len; | |
1824 | ||
1825 | out_nlmsg_trim: | |
1826 | nla_put_failure: | |
1827 | nlmsg_trim(skb, b); | |
1828 | return -1; | |
1829 | } | |
1830 | ||
1831 | static int tclass_notify(struct net *net, struct sk_buff *oskb, | |
1832 | struct nlmsghdr *n, struct Qdisc *q, | |
1833 | unsigned long cl, int event) | |
1834 | { | |
1835 | struct sk_buff *skb; | |
1836 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
5b5f99b1 | 1837 | int err = 0; |
27d7f07c WC |
1838 | |
1839 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1840 | if (!skb) | |
1841 | return -ENOBUFS; | |
1842 | ||
1843 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { | |
1844 | kfree_skb(skb); | |
1845 | return -EINVAL; | |
1846 | } | |
1847 | ||
5b5f99b1 ZW |
1848 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1849 | n->nlmsg_flags & NLM_F_ECHO); | |
1850 | if (err > 0) | |
1851 | err = 0; | |
1852 | return err; | |
27d7f07c | 1853 | } |
1da177e4 | 1854 | |
14546ba1 WC |
1855 | static int tclass_del_notify(struct net *net, |
1856 | const struct Qdisc_class_ops *cops, | |
1857 | struct sk_buff *oskb, struct nlmsghdr *n, | |
1858 | struct Qdisc *q, unsigned long cl) | |
1859 | { | |
1860 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1861 | struct sk_buff *skb; | |
1862 | int err = 0; | |
1863 | ||
1864 | if (!cops->delete) | |
1865 | return -EOPNOTSUPP; | |
1866 | ||
1867 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1868 | if (!skb) | |
1869 | return -ENOBUFS; | |
1870 | ||
1871 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, | |
1872 | RTM_DELTCLASS) < 0) { | |
1873 | kfree_skb(skb); | |
1874 | return -EINVAL; | |
1875 | } | |
1876 | ||
1877 | err = cops->delete(q, cl); | |
1878 | if (err) { | |
1879 | kfree_skb(skb); | |
1880 | return err; | |
1881 | } | |
1882 | ||
5b5f99b1 ZW |
1883 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1884 | n->nlmsg_flags & NLM_F_ECHO); | |
1885 | if (err > 0) | |
1886 | err = 0; | |
1887 | return err; | |
14546ba1 WC |
1888 | } |
1889 | ||
07d79fc7 CW |
1890 | #ifdef CONFIG_NET_CLS |
1891 | ||
1892 | struct tcf_bind_args { | |
1893 | struct tcf_walker w; | |
1894 | u32 classid; | |
1895 | unsigned long cl; | |
1896 | }; | |
1897 | ||
1898 | static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg) | |
1899 | { | |
1900 | struct tcf_bind_args *a = (void *)arg; | |
1901 | ||
1902 | if (tp->ops->bind_class) { | |
74e3be60 JP |
1903 | struct Qdisc *q = tcf_block_q(tp->chain->block); |
1904 | ||
1905 | sch_tree_lock(q); | |
07d79fc7 | 1906 | tp->ops->bind_class(n, a->classid, a->cl); |
74e3be60 | 1907 | sch_tree_unlock(q); |
07d79fc7 CW |
1908 | } |
1909 | return 0; | |
1910 | } | |
1911 | ||
1912 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
1913 | unsigned long new_cl) | |
1914 | { | |
1915 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1916 | struct tcf_block *block; | |
1917 | struct tcf_chain *chain; | |
1918 | unsigned long cl; | |
1919 | ||
1920 | cl = cops->find(q, portid); | |
1921 | if (!cl) | |
1922 | return; | |
8b142a00 CW |
1923 | if (!cops->tcf_block) |
1924 | return; | |
cbaacc4e | 1925 | block = cops->tcf_block(q, cl, NULL); |
07d79fc7 CW |
1926 | if (!block) |
1927 | return; | |
bbf73830 VB |
1928 | for (chain = tcf_get_next_chain(block, NULL); |
1929 | chain; | |
1930 | chain = tcf_get_next_chain(block, chain)) { | |
07d79fc7 CW |
1931 | struct tcf_proto *tp; |
1932 | ||
12db03b6 VB |
1933 | for (tp = tcf_get_next_proto(chain, NULL, true); |
1934 | tp; tp = tcf_get_next_proto(chain, tp, true)) { | |
07d79fc7 CW |
1935 | struct tcf_bind_args arg = {}; |
1936 | ||
1937 | arg.w.fn = tcf_node_bind; | |
1938 | arg.classid = clid; | |
1939 | arg.cl = new_cl; | |
12db03b6 | 1940 | tp->ops->walk(tp, &arg.w, true); |
07d79fc7 CW |
1941 | } |
1942 | } | |
1943 | } | |
1944 | ||
1945 | #else | |
1946 | ||
1947 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
1948 | unsigned long new_cl) | |
1949 | { | |
1950 | } | |
1951 | ||
1952 | #endif | |
1953 | ||
c21ef3e3 DA |
1954 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, |
1955 | struct netlink_ext_ack *extack) | |
1da177e4 | 1956 | { |
3b1e0a65 | 1957 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1958 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1959 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1960 | struct net_device *dev; |
1961 | struct Qdisc *q = NULL; | |
20fea08b | 1962 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1963 | unsigned long cl = 0; |
1964 | unsigned long new_cl; | |
de179c8c H |
1965 | u32 portid; |
1966 | u32 clid; | |
1967 | u32 qid; | |
1da177e4 LT |
1968 | int err; |
1969 | ||
4e8bbb81 | 1970 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
5f013c9b | 1971 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1972 | return -EPERM; |
1973 | ||
8cb08174 JB |
1974 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1975 | rtm_tca_policy, extack); | |
1e90474c PM |
1976 | if (err < 0) |
1977 | return err; | |
1978 | ||
de179c8c H |
1979 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1980 | if (!dev) | |
1981 | return -ENODEV; | |
1982 | ||
1da177e4 LT |
1983 | /* |
1984 | parent == TC_H_UNSPEC - unspecified parent. | |
1985 | parent == TC_H_ROOT - class is root, which has no parent. | |
1986 | parent == X:0 - parent is root class. | |
1987 | parent == X:Y - parent is a node in hierarchy. | |
1988 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1989 | ||
1990 | handle == 0:0 - generate handle from kernel pool. | |
1991 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1992 | handle == X:Y - clear. | |
1993 | handle == X:0 - root class. | |
1994 | */ | |
1995 | ||
1996 | /* Step 1. Determine qdisc handle X:0 */ | |
1997 | ||
de179c8c H |
1998 | portid = tcm->tcm_parent; |
1999 | clid = tcm->tcm_handle; | |
2000 | qid = TC_H_MAJ(clid); | |
2001 | ||
15e47304 EB |
2002 | if (portid != TC_H_ROOT) { |
2003 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
2004 | |
2005 | if (qid && qid1) { | |
2006 | /* If both majors are known, they must be identical. */ | |
2007 | if (qid != qid1) | |
2008 | return -EINVAL; | |
2009 | } else if (qid1) { | |
2010 | qid = qid1; | |
2011 | } else if (qid == 0) | |
af356afa | 2012 | qid = dev->qdisc->handle; |
1da177e4 LT |
2013 | |
2014 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
2015 | * both with parent and child. |
2016 | * | |
15e47304 | 2017 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 2018 | */ |
15e47304 EB |
2019 | if (portid) |
2020 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
2021 | } else { |
2022 | if (qid == 0) | |
af356afa | 2023 | qid = dev->qdisc->handle; |
1da177e4 LT |
2024 | } |
2025 | ||
2026 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
2027 | q = qdisc_lookup(dev, qid); |
2028 | if (!q) | |
1da177e4 LT |
2029 | return -ENOENT; |
2030 | ||
2031 | /* An check that it supports classes */ | |
2032 | cops = q->ops->cl_ops; | |
2033 | if (cops == NULL) | |
2034 | return -EINVAL; | |
2035 | ||
2036 | /* Now try to get class */ | |
2037 | if (clid == 0) { | |
15e47304 | 2038 | if (portid == TC_H_ROOT) |
1da177e4 LT |
2039 | clid = qid; |
2040 | } else | |
2041 | clid = TC_H_MAKE(qid, clid); | |
2042 | ||
2043 | if (clid) | |
143976ce | 2044 | cl = cops->find(q, clid); |
1da177e4 LT |
2045 | |
2046 | if (cl == 0) { | |
2047 | err = -ENOENT; | |
cc7ec456 ED |
2048 | if (n->nlmsg_type != RTM_NEWTCLASS || |
2049 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
2050 | goto out; |
2051 | } else { | |
2052 | switch (n->nlmsg_type) { | |
10297b99 | 2053 | case RTM_NEWTCLASS: |
1da177e4 | 2054 | err = -EEXIST; |
cc7ec456 | 2055 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
2056 | goto out; |
2057 | break; | |
2058 | case RTM_DELTCLASS: | |
14546ba1 | 2059 | err = tclass_del_notify(net, cops, skb, n, q, cl); |
07d79fc7 CW |
2060 | /* Unbind the class with flilters with 0 */ |
2061 | tc_bind_tclass(q, portid, clid, 0); | |
1da177e4 LT |
2062 | goto out; |
2063 | case RTM_GETTCLASS: | |
7316ae88 | 2064 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
2065 | goto out; |
2066 | default: | |
2067 | err = -EINVAL; | |
2068 | goto out; | |
2069 | } | |
2070 | } | |
2071 | ||
d47a6b0e JP |
2072 | if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) { |
2073 | NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes"); | |
2074 | return -EOPNOTSUPP; | |
2075 | } | |
2076 | ||
1da177e4 | 2077 | new_cl = cl; |
de6d5cdf PM |
2078 | err = -EOPNOTSUPP; |
2079 | if (cops->change) | |
793d81d6 | 2080 | err = cops->change(q, clid, portid, tca, &new_cl, extack); |
07d79fc7 | 2081 | if (err == 0) { |
7316ae88 | 2082 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
07d79fc7 CW |
2083 | /* We just create a new class, need to do reverse binding. */ |
2084 | if (cl != new_cl) | |
2085 | tc_bind_tclass(q, portid, clid, new_cl); | |
2086 | } | |
1da177e4 | 2087 | out: |
1da177e4 LT |
2088 | return err; |
2089 | } | |
2090 | ||
cc7ec456 ED |
2091 | struct qdisc_dump_args { |
2092 | struct qdisc_walker w; | |
2093 | struct sk_buff *skb; | |
2094 | struct netlink_callback *cb; | |
1da177e4 LT |
2095 | }; |
2096 | ||
5a7a5555 JHS |
2097 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, |
2098 | struct qdisc_walker *arg) | |
1da177e4 LT |
2099 | { |
2100 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
2101 | ||
15e47304 | 2102 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
2103 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
2104 | RTM_NEWTCLASS); | |
1da177e4 LT |
2105 | } |
2106 | ||
30723673 DM |
2107 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
2108 | struct tcmsg *tcm, struct netlink_callback *cb, | |
2109 | int *t_p, int s_t) | |
2110 | { | |
2111 | struct qdisc_dump_args arg; | |
2112 | ||
49b49971 | 2113 | if (tc_qdisc_dump_ignore(q, false) || |
30723673 DM |
2114 | *t_p < s_t || !q->ops->cl_ops || |
2115 | (tcm->tcm_parent && | |
2116 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
2117 | (*t_p)++; | |
2118 | return 0; | |
2119 | } | |
2120 | if (*t_p > s_t) | |
2121 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
2122 | arg.w.fn = qdisc_class_dump; | |
2123 | arg.skb = skb; | |
2124 | arg.cb = cb; | |
2125 | arg.w.stop = 0; | |
2126 | arg.w.skip = cb->args[1]; | |
2127 | arg.w.count = 0; | |
2128 | q->ops->cl_ops->walk(q, &arg.w); | |
2129 | cb->args[1] = arg.w.count; | |
2130 | if (arg.w.stop) | |
2131 | return -1; | |
2132 | (*t_p)++; | |
2133 | return 0; | |
2134 | } | |
2135 | ||
2136 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
2137 | struct tcmsg *tcm, struct netlink_callback *cb, | |
2138 | int *t_p, int s_t) | |
2139 | { | |
2140 | struct Qdisc *q; | |
59cc1f61 | 2141 | int b; |
30723673 DM |
2142 | |
2143 | if (!root) | |
2144 | return 0; | |
2145 | ||
2146 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
2147 | return -1; | |
2148 | ||
69012ae4 JK |
2149 | if (!qdisc_dev(root)) |
2150 | return 0; | |
2151 | ||
cb395b20 ED |
2152 | if (tcm->tcm_parent) { |
2153 | q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent)); | |
3c53ed8f PS |
2154 | if (q && q != root && |
2155 | tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
cb395b20 ED |
2156 | return -1; |
2157 | return 0; | |
2158 | } | |
59cc1f61 | 2159 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
2160 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
2161 | return -1; | |
2162 | } | |
2163 | ||
2164 | return 0; | |
2165 | } | |
2166 | ||
1da177e4 LT |
2167 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
2168 | { | |
02ef22ca | 2169 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 2170 | struct net *net = sock_net(skb->sk); |
30723673 | 2171 | struct netdev_queue *dev_queue; |
1da177e4 | 2172 | struct net_device *dev; |
30723673 | 2173 | int t, s_t; |
1da177e4 | 2174 | |
573ce260 | 2175 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 2176 | return 0; |
cc7ec456 ED |
2177 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
2178 | if (!dev) | |
1da177e4 LT |
2179 | return 0; |
2180 | ||
2181 | s_t = cb->args[0]; | |
2182 | t = 0; | |
2183 | ||
af356afa | 2184 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
2185 | goto done; |
2186 | ||
24824a09 ED |
2187 | dev_queue = dev_ingress_queue(dev); |
2188 | if (dev_queue && | |
2189 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
2190 | &t, s_t) < 0) | |
30723673 | 2191 | goto done; |
1da177e4 | 2192 | |
30723673 | 2193 | done: |
1da177e4 LT |
2194 | cb->args[0] = t; |
2195 | ||
2196 | dev_put(dev); | |
2197 | return skb->len; | |
2198 | } | |
2199 | ||
1da177e4 LT |
2200 | #ifdef CONFIG_PROC_FS |
2201 | static int psched_show(struct seq_file *seq, void *v) | |
2202 | { | |
2203 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 2204 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 2205 | 1000000, |
1e317688 | 2206 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
2207 | |
2208 | return 0; | |
2209 | } | |
2210 | ||
7316ae88 TG |
2211 | static int __net_init psched_net_init(struct net *net) |
2212 | { | |
2213 | struct proc_dir_entry *e; | |
2214 | ||
3f3942ac | 2215 | e = proc_create_single("psched", 0, net->proc_net, psched_show); |
7316ae88 TG |
2216 | if (e == NULL) |
2217 | return -ENOMEM; | |
2218 | ||
2219 | return 0; | |
2220 | } | |
2221 | ||
2222 | static void __net_exit psched_net_exit(struct net *net) | |
2223 | { | |
ece31ffd | 2224 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
2225 | } |
2226 | #else | |
2227 | static int __net_init psched_net_init(struct net *net) | |
2228 | { | |
2229 | return 0; | |
2230 | } | |
2231 | ||
2232 | static void __net_exit psched_net_exit(struct net *net) | |
2233 | { | |
2234 | } | |
1da177e4 LT |
2235 | #endif |
2236 | ||
7316ae88 TG |
2237 | static struct pernet_operations psched_net_ops = { |
2238 | .init = psched_net_init, | |
2239 | .exit = psched_net_exit, | |
2240 | }; | |
2241 | ||
1da177e4 LT |
2242 | static int __init pktsched_init(void) |
2243 | { | |
7316ae88 TG |
2244 | int err; |
2245 | ||
2246 | err = register_pernet_subsys(&psched_net_ops); | |
2247 | if (err) { | |
cc7ec456 | 2248 | pr_err("pktsched_init: " |
7316ae88 TG |
2249 | "cannot initialize per netns operations\n"); |
2250 | return err; | |
2251 | } | |
2252 | ||
6da7c8fc | 2253 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
2254 | register_qdisc(&pfifo_qdisc_ops); |
2255 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 2256 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 2257 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 2258 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 2259 | |
b97bac64 FW |
2260 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0); |
2261 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0); | |
5a7a5555 | 2262 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, |
b97bac64 FW |
2263 | 0); |
2264 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0); | |
2265 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0); | |
5a7a5555 | 2266 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, |
b97bac64 | 2267 | 0); |
be577ddc | 2268 | |
1da177e4 LT |
2269 | return 0; |
2270 | } | |
2271 | ||
2272 | subsys_initcall(pktsched_init); |