Commit | Line | Data |
---|---|---|
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> |
7f0e8102 | 34 | #include <net/tc_wrapper.h> |
1da177e4 | 35 | |
f5a7833e CW |
36 | #include <trace/events/qdisc.h> |
37 | ||
1da177e4 LT |
38 | /* |
39 | ||
40 | Short review. | |
41 | ------------- | |
42 | ||
43 | This file consists of two interrelated parts: | |
44 | ||
45 | 1. queueing disciplines manager frontend. | |
46 | 2. traffic classes manager frontend. | |
47 | ||
48 | Generally, queueing discipline ("qdisc") is a black box, | |
49 | which is able to enqueue packets and to dequeue them (when | |
50 | device is ready to send something) in order and at times | |
51 | determined by algorithm hidden in it. | |
52 | ||
53 | qdisc's are divided to two categories: | |
54 | - "queues", which have no internal structure visible from outside. | |
55 | - "schedulers", which split all the packets to "traffic classes", | |
56 | using "packet classifiers" (look at cls_api.c) | |
57 | ||
58 | In turn, classes may have child qdiscs (as rule, queues) | |
59 | attached to them etc. etc. etc. | |
60 | ||
61 | The goal of the routines in this file is to translate | |
62 | information supplied by user in the form of handles | |
63 | to more intelligible for kernel form, to make some sanity | |
64 | checks and part of work, which is common to all qdiscs | |
65 | and to provide rtnetlink notifications. | |
66 | ||
67 | All real intelligent work is done inside qdisc modules. | |
68 | ||
69 | ||
70 | ||
71 | Every discipline has two major routines: enqueue and dequeue. | |
72 | ||
73 | ---dequeue | |
74 | ||
75 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
76 | but it does not mean that queue is empty, it just means that | |
77 | discipline does not want to send anything this time. | |
78 | Queue is really empty if q->q.qlen == 0. | |
79 | For complicated disciplines with multiple queues q->q is not | |
80 | real packet queue, but however q->q.qlen must be valid. | |
81 | ||
82 | ---enqueue | |
83 | ||
84 | enqueue returns 0, if packet was enqueued successfully. | |
85 | If packet (this one or another one) was dropped, it returns | |
86 | not zero error code. | |
87 | NET_XMIT_DROP - this packet dropped | |
88 | Expected action: do not backoff, but wait until queue will clear. | |
89 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
90 | Expected action: backoff or ignore | |
1da177e4 LT |
91 | |
92 | Auxiliary routines: | |
93 | ||
99c0db26 JP |
94 | ---peek |
95 | ||
96 | like dequeue but without removing a packet from the queue | |
97 | ||
1da177e4 LT |
98 | ---reset |
99 | ||
100 | returns qdisc to initial state: purge all buffers, clear all | |
101 | timers, counters (except for statistics) etc. | |
102 | ||
103 | ---init | |
104 | ||
105 | initializes newly created qdisc. | |
106 | ||
107 | ---destroy | |
108 | ||
109 | destroys resources allocated by init and during lifetime of qdisc. | |
110 | ||
111 | ---change | |
112 | ||
113 | changes qdisc parameters. | |
114 | */ | |
115 | ||
116 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
117 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
118 | ||
119 | ||
120 | /************************************************ | |
121 | * Queueing disciplines manipulation. * | |
122 | ************************************************/ | |
123 | ||
124 | ||
125 | /* The list of all installed queueing disciplines. */ | |
126 | ||
127 | static struct Qdisc_ops *qdisc_base; | |
128 | ||
21eb2189 | 129 | /* Register/unregister queueing discipline */ |
1da177e4 LT |
130 | |
131 | int register_qdisc(struct Qdisc_ops *qops) | |
132 | { | |
133 | struct Qdisc_ops *q, **qp; | |
134 | int rc = -EEXIST; | |
135 | ||
136 | write_lock(&qdisc_mod_lock); | |
137 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
138 | if (!strcmp(qops->id, q->id)) | |
139 | goto out; | |
140 | ||
141 | if (qops->enqueue == NULL) | |
142 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 | 143 | if (qops->peek == NULL) { |
68fd26b5 | 144 | if (qops->dequeue == NULL) |
99c0db26 | 145 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
146 | else |
147 | goto out_einval; | |
99c0db26 | 148 | } |
1da177e4 LT |
149 | if (qops->dequeue == NULL) |
150 | qops->dequeue = noop_qdisc_ops.dequeue; | |
151 | ||
68fd26b5 JP |
152 | if (qops->cl_ops) { |
153 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
154 | ||
143976ce | 155 | if (!(cops->find && cops->walk && cops->leaf)) |
68fd26b5 JP |
156 | goto out_einval; |
157 | ||
6529eaba | 158 | if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf)) |
68fd26b5 JP |
159 | goto out_einval; |
160 | } | |
161 | ||
1da177e4 LT |
162 | qops->next = NULL; |
163 | *qp = qops; | |
164 | rc = 0; | |
165 | out: | |
166 | write_unlock(&qdisc_mod_lock); | |
167 | return rc; | |
68fd26b5 JP |
168 | |
169 | out_einval: | |
170 | rc = -EINVAL; | |
171 | goto out; | |
1da177e4 | 172 | } |
62e3ba1b | 173 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 | 174 | |
52327d2e | 175 | void unregister_qdisc(struct Qdisc_ops *qops) |
1da177e4 LT |
176 | { |
177 | struct Qdisc_ops *q, **qp; | |
178 | int err = -ENOENT; | |
179 | ||
180 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 181 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
182 | if (q == qops) |
183 | break; | |
184 | if (q) { | |
185 | *qp = q->next; | |
186 | q->next = NULL; | |
187 | err = 0; | |
188 | } | |
189 | write_unlock(&qdisc_mod_lock); | |
52327d2e ZS |
190 | |
191 | WARN(err, "unregister qdisc(%s) failed\n", qops->id); | |
1da177e4 | 192 | } |
62e3ba1b | 193 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 | 194 | |
6da7c8fc | 195 | /* Get default qdisc if not otherwise specified */ |
196 | void qdisc_get_default(char *name, size_t len) | |
197 | { | |
198 | read_lock(&qdisc_mod_lock); | |
92f24c6f | 199 | strscpy(name, default_qdisc_ops->id, len); |
6da7c8fc | 200 | read_unlock(&qdisc_mod_lock); |
201 | } | |
202 | ||
203 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) | |
204 | { | |
205 | struct Qdisc_ops *q = NULL; | |
206 | ||
207 | for (q = qdisc_base; q; q = q->next) { | |
208 | if (!strcmp(name, q->id)) { | |
209 | if (!try_module_get(q->owner)) | |
210 | q = NULL; | |
211 | break; | |
212 | } | |
213 | } | |
214 | ||
215 | return q; | |
216 | } | |
217 | ||
218 | /* Set new default qdisc to use */ | |
219 | int qdisc_set_default(const char *name) | |
220 | { | |
221 | const struct Qdisc_ops *ops; | |
222 | ||
223 | if (!capable(CAP_NET_ADMIN)) | |
224 | return -EPERM; | |
225 | ||
226 | write_lock(&qdisc_mod_lock); | |
227 | ops = qdisc_lookup_default(name); | |
228 | if (!ops) { | |
229 | /* Not found, drop lock and try to load module */ | |
230 | write_unlock(&qdisc_mod_lock); | |
231 | request_module("sch_%s", name); | |
232 | write_lock(&qdisc_mod_lock); | |
233 | ||
234 | ops = qdisc_lookup_default(name); | |
235 | } | |
236 | ||
237 | if (ops) { | |
238 | /* Set new default */ | |
239 | module_put(default_qdisc_ops->owner); | |
240 | default_qdisc_ops = ops; | |
241 | } | |
242 | write_unlock(&qdisc_mod_lock); | |
243 | ||
244 | return ops ? 0 : -ENOENT; | |
245 | } | |
246 | ||
8ea3e439 | 247 | #ifdef CONFIG_NET_SCH_DEFAULT |
248 | /* Set default value from kernel config */ | |
249 | static int __init sch_default_qdisc(void) | |
250 | { | |
251 | return qdisc_set_default(CONFIG_DEFAULT_NET_SCH); | |
252 | } | |
253 | late_initcall(sch_default_qdisc); | |
254 | #endif | |
255 | ||
1da177e4 | 256 | /* We know handle. Find qdisc among all qdisc's attached to device |
4eaf3b84 ED |
257 | * (root qdisc, all its children, children of children etc.) |
258 | * Note: caller either uses rtnl or rcu_read_lock() | |
1da177e4 LT |
259 | */ |
260 | ||
6113b748 | 261 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
262 | { |
263 | struct Qdisc *q; | |
264 | ||
69012ae4 JK |
265 | if (!qdisc_dev(root)) |
266 | return (root->handle == handle ? root : NULL); | |
267 | ||
8123b421 DM |
268 | if (!(root->flags & TCQ_F_BUILTIN) && |
269 | root->handle == handle) | |
270 | return root; | |
271 | ||
a8b7b2d0 JP |
272 | hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle, |
273 | lockdep_rtnl_is_held()) { | |
8123b421 DM |
274 | if (q->handle == handle) |
275 | return q; | |
276 | } | |
277 | return NULL; | |
278 | } | |
279 | ||
49b49971 | 280 | void qdisc_hash_add(struct Qdisc *q, bool invisible) |
f6e0b239 | 281 | { |
37314363 | 282 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
4eaf3b84 | 283 | ASSERT_RTNL(); |
59cc1f61 | 284 | hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle); |
49b49971 JK |
285 | if (invisible) |
286 | q->flags |= TCQ_F_INVISIBLE; | |
37314363 | 287 | } |
f6e0b239 | 288 | } |
59cc1f61 | 289 | EXPORT_SYMBOL(qdisc_hash_add); |
f6e0b239 | 290 | |
59cc1f61 | 291 | void qdisc_hash_del(struct Qdisc *q) |
f6e0b239 | 292 | { |
4eaf3b84 ED |
293 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
294 | ASSERT_RTNL(); | |
59cc1f61 | 295 | hash_del_rcu(&q->hash); |
4eaf3b84 | 296 | } |
f6e0b239 | 297 | } |
59cc1f61 | 298 | EXPORT_SYMBOL(qdisc_hash_del); |
f6e0b239 | 299 | |
ead81cc5 | 300 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 301 | { |
f6e0b239 JP |
302 | struct Qdisc *q; |
303 | ||
50317fce CW |
304 | if (!handle) |
305 | return NULL; | |
5891cd5e | 306 | q = qdisc_match_from_root(rtnl_dereference(dev->qdisc), handle); |
af356afa PM |
307 | if (q) |
308 | goto out; | |
f6e0b239 | 309 | |
24824a09 ED |
310 | if (dev_ingress_queue(dev)) |
311 | q = qdisc_match_from_root( | |
312 | dev_ingress_queue(dev)->qdisc_sleeping, | |
313 | handle); | |
f6486d40 | 314 | out: |
f6e0b239 | 315 | return q; |
1da177e4 LT |
316 | } |
317 | ||
3a7d0d07 VB |
318 | struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle) |
319 | { | |
320 | struct netdev_queue *nq; | |
321 | struct Qdisc *q; | |
322 | ||
323 | if (!handle) | |
324 | return NULL; | |
5891cd5e | 325 | q = qdisc_match_from_root(rcu_dereference(dev->qdisc), handle); |
3a7d0d07 VB |
326 | if (q) |
327 | goto out; | |
328 | ||
329 | nq = dev_ingress_queue_rcu(dev); | |
330 | if (nq) | |
331 | q = qdisc_match_from_root(nq->qdisc_sleeping, handle); | |
332 | out: | |
333 | return q; | |
334 | } | |
335 | ||
1da177e4 LT |
336 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) |
337 | { | |
338 | unsigned long cl; | |
20fea08b | 339 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
340 | |
341 | if (cops == NULL) | |
342 | return NULL; | |
143976ce | 343 | cl = cops->find(p, classid); |
1da177e4 LT |
344 | |
345 | if (cl == 0) | |
346 | return NULL; | |
2561f972 | 347 | return cops->leaf(p, cl); |
1da177e4 LT |
348 | } |
349 | ||
350 | /* Find queueing discipline by name */ | |
351 | ||
1e90474c | 352 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
353 | { |
354 | struct Qdisc_ops *q = NULL; | |
355 | ||
356 | if (kind) { | |
357 | read_lock(&qdisc_mod_lock); | |
358 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 359 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
360 | if (!try_module_get(q->owner)) |
361 | q = NULL; | |
362 | break; | |
363 | } | |
364 | } | |
365 | read_unlock(&qdisc_mod_lock); | |
366 | } | |
367 | return q; | |
368 | } | |
369 | ||
8a8e3d84 JDB |
370 | /* The linklayer setting were not transferred from iproute2, in older |
371 | * versions, and the rate tables lookup systems have been dropped in | |
372 | * the kernel. To keep backward compatible with older iproute2 tc | |
373 | * utils, we detect the linklayer setting by detecting if the rate | |
374 | * table were modified. | |
375 | * | |
376 | * For linklayer ATM table entries, the rate table will be aligned to | |
377 | * 48 bytes, thus some table entries will contain the same value. The | |
378 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
379 | * starting from the mpu, we find low and high table entries for | |
380 | * mapping this cell. If these entries contain the same value, when | |
381 | * the rate tables have been modified for linklayer ATM. | |
382 | * | |
383 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
384 | * and then roundup to the next cell, calc the table entry one below, | |
385 | * and compare. | |
386 | */ | |
387 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
388 | { | |
389 | int low = roundup(r->mpu, 48); | |
390 | int high = roundup(low+1, 48); | |
391 | int cell_low = low >> r->cell_log; | |
392 | int cell_high = (high >> r->cell_log) - 1; | |
393 | ||
394 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
395 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
396 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
397 | return TC_LINKLAYER_ETHERNET; | |
398 | } | |
399 | ||
400 | if ((cell_high > cell_low) && (cell_high < 256) | |
401 | && (rtab[cell_low] == rtab[cell_high])) { | |
402 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
403 | cell_low, cell_high, rtab[cell_high]); | |
404 | return TC_LINKLAYER_ATM; | |
405 | } | |
406 | return TC_LINKLAYER_ETHERNET; | |
407 | } | |
408 | ||
1da177e4 LT |
409 | static struct qdisc_rate_table *qdisc_rtab_list; |
410 | ||
5a7a5555 | 411 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
e9bc3fa2 AA |
412 | struct nlattr *tab, |
413 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
414 | { |
415 | struct qdisc_rate_table *rtab; | |
416 | ||
e4bedf48 ED |
417 | if (tab == NULL || r->rate == 0 || |
418 | r->cell_log == 0 || r->cell_log >= 32 || | |
e9bc3fa2 AA |
419 | nla_len(tab) != TC_RTAB_SIZE) { |
420 | NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching"); | |
40edeff6 | 421 | return NULL; |
e9bc3fa2 | 422 | } |
40edeff6 | 423 | |
1da177e4 | 424 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
425 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
426 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
427 | rtab->refcnt++; |
428 | return rtab; | |
429 | } | |
430 | } | |
431 | ||
1da177e4 LT |
432 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
433 | if (rtab) { | |
434 | rtab->rate = *r; | |
435 | rtab->refcnt = 1; | |
1e90474c | 436 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
437 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
438 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
439 | rtab->next = qdisc_rtab_list; |
440 | qdisc_rtab_list = rtab; | |
e9bc3fa2 AA |
441 | } else { |
442 | NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table"); | |
1da177e4 LT |
443 | } |
444 | return rtab; | |
445 | } | |
62e3ba1b | 446 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
447 | |
448 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
449 | { | |
450 | struct qdisc_rate_table *rtab, **rtabp; | |
451 | ||
452 | if (!tab || --tab->refcnt) | |
453 | return; | |
454 | ||
cc7ec456 ED |
455 | for (rtabp = &qdisc_rtab_list; |
456 | (rtab = *rtabp) != NULL; | |
457 | rtabp = &rtab->next) { | |
1da177e4 LT |
458 | if (rtab == tab) { |
459 | *rtabp = rtab->next; | |
460 | kfree(rtab); | |
461 | return; | |
462 | } | |
463 | } | |
464 | } | |
62e3ba1b | 465 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 466 | |
175f9c1b | 467 | static LIST_HEAD(qdisc_stab_list); |
175f9c1b JK |
468 | |
469 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
470 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
471 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
472 | }; | |
473 | ||
09215598 AA |
474 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt, |
475 | struct netlink_ext_ack *extack) | |
175f9c1b JK |
476 | { |
477 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
478 | struct qdisc_size_table *stab; | |
479 | struct tc_sizespec *s; | |
480 | unsigned int tsize = 0; | |
481 | u16 *tab = NULL; | |
482 | int err; | |
483 | ||
8cb08174 JB |
484 | err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy, |
485 | extack); | |
175f9c1b JK |
486 | if (err < 0) |
487 | return ERR_PTR(err); | |
09215598 AA |
488 | if (!tb[TCA_STAB_BASE]) { |
489 | NL_SET_ERR_MSG(extack, "Size table base attribute is missing"); | |
175f9c1b | 490 | return ERR_PTR(-EINVAL); |
09215598 | 491 | } |
175f9c1b JK |
492 | |
493 | s = nla_data(tb[TCA_STAB_BASE]); | |
494 | ||
495 | if (s->tsize > 0) { | |
09215598 AA |
496 | if (!tb[TCA_STAB_DATA]) { |
497 | NL_SET_ERR_MSG(extack, "Size table data attribute is missing"); | |
175f9c1b | 498 | return ERR_PTR(-EINVAL); |
09215598 | 499 | } |
175f9c1b JK |
500 | tab = nla_data(tb[TCA_STAB_DATA]); |
501 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
502 | } | |
503 | ||
09215598 AA |
504 | if (tsize != s->tsize || (!tab && tsize > 0)) { |
505 | NL_SET_ERR_MSG(extack, "Invalid size of size table"); | |
175f9c1b | 506 | return ERR_PTR(-EINVAL); |
09215598 | 507 | } |
175f9c1b | 508 | |
175f9c1b JK |
509 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
510 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
511 | continue; | |
69508d43 GS |
512 | if (tsize > 0 && |
513 | memcmp(stab->data, tab, flex_array_size(stab, data, tsize))) | |
175f9c1b JK |
514 | continue; |
515 | stab->refcnt++; | |
175f9c1b JK |
516 | return stab; |
517 | } | |
518 | ||
b193e15a | 519 | if (s->size_log > STAB_SIZE_LOG_MAX || |
520 | s->cell_log > STAB_SIZE_LOG_MAX) { | |
521 | NL_SET_ERR_MSG(extack, "Invalid logarithmic size of size table"); | |
522 | return ERR_PTR(-EINVAL); | |
523 | } | |
524 | ||
69508d43 | 525 | stab = kmalloc(struct_size(stab, data, tsize), GFP_KERNEL); |
175f9c1b JK |
526 | if (!stab) |
527 | return ERR_PTR(-ENOMEM); | |
528 | ||
529 | stab->refcnt = 1; | |
530 | stab->szopts = *s; | |
531 | if (tsize > 0) | |
69508d43 | 532 | memcpy(stab->data, tab, flex_array_size(stab, data, tsize)); |
175f9c1b | 533 | |
175f9c1b | 534 | list_add_tail(&stab->list, &qdisc_stab_list); |
175f9c1b JK |
535 | |
536 | return stab; | |
537 | } | |
538 | ||
539 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
540 | { | |
541 | if (!tab) | |
542 | return; | |
543 | ||
175f9c1b JK |
544 | if (--tab->refcnt == 0) { |
545 | list_del(&tab->list); | |
6e07902f | 546 | kfree_rcu(tab, rcu); |
175f9c1b | 547 | } |
175f9c1b JK |
548 | } |
549 | EXPORT_SYMBOL(qdisc_put_stab); | |
550 | ||
551 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
552 | { | |
553 | struct nlattr *nest; | |
554 | ||
ae0be8de | 555 | nest = nla_nest_start_noflag(skb, TCA_STAB); |
3aa4614d PM |
556 | if (nest == NULL) |
557 | goto nla_put_failure; | |
1b34ec43 DM |
558 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
559 | goto nla_put_failure; | |
175f9c1b JK |
560 | nla_nest_end(skb, nest); |
561 | ||
562 | return skb->len; | |
563 | ||
564 | nla_put_failure: | |
565 | return -1; | |
566 | } | |
567 | ||
5a7a5555 JHS |
568 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
569 | const struct qdisc_size_table *stab) | |
175f9c1b JK |
570 | { |
571 | int pkt_len, slot; | |
572 | ||
573 | pkt_len = skb->len + stab->szopts.overhead; | |
574 | if (unlikely(!stab->szopts.tsize)) | |
575 | goto out; | |
576 | ||
577 | slot = pkt_len + stab->szopts.cell_align; | |
578 | if (unlikely(slot < 0)) | |
579 | slot = 0; | |
580 | ||
581 | slot >>= stab->szopts.cell_log; | |
582 | if (likely(slot < stab->szopts.tsize)) | |
583 | pkt_len = stab->data[slot]; | |
584 | else | |
585 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
586 | (slot / stab->szopts.tsize) + | |
587 | stab->data[slot % stab->szopts.tsize]; | |
588 | ||
589 | pkt_len <<= stab->szopts.size_log; | |
590 | out: | |
591 | if (unlikely(pkt_len < 1)) | |
592 | pkt_len = 1; | |
593 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
594 | } | |
a2da570d | 595 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 596 | |
6e765a00 | 597 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
598 | { |
599 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
600 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
601 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
602 | qdisc->flags |= TCQ_F_WARN_NONWC; |
603 | } | |
604 | } | |
605 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
606 | ||
4179477f PM |
607 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
608 | { | |
609 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 610 | timer); |
4179477f | 611 | |
1e203c1a | 612 | rcu_read_lock(); |
8608db03 | 613 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 614 | rcu_read_unlock(); |
1936502d | 615 | |
4179477f PM |
616 | return HRTIMER_NORESTART; |
617 | } | |
618 | ||
860b642b VCG |
619 | void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc, |
620 | clockid_t clockid) | |
4179477f | 621 | { |
860b642b | 622 | hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 623 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
624 | wd->qdisc = qdisc; |
625 | } | |
860b642b VCG |
626 | EXPORT_SYMBOL(qdisc_watchdog_init_clockid); |
627 | ||
628 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
629 | { | |
630 | qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC); | |
631 | } | |
4179477f PM |
632 | EXPORT_SYMBOL(qdisc_watchdog_init); |
633 | ||
efe074c2 ED |
634 | void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires, |
635 | u64 delta_ns) | |
4179477f | 636 | { |
2540e051 JP |
637 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
638 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
639 | return; | |
640 | ||
b88948fb ED |
641 | if (hrtimer_is_queued(&wd->timer)) { |
642 | /* If timer is already set in [expires, expires + delta_ns], | |
643 | * do not reprogram it. | |
644 | */ | |
645 | if (wd->last_expires - expires <= delta_ns) | |
646 | return; | |
647 | } | |
a9efad8b ED |
648 | |
649 | wd->last_expires = expires; | |
efe074c2 ED |
650 | hrtimer_start_range_ns(&wd->timer, |
651 | ns_to_ktime(expires), | |
652 | delta_ns, | |
653 | HRTIMER_MODE_ABS_PINNED); | |
4179477f | 654 | } |
efe074c2 | 655 | EXPORT_SYMBOL(qdisc_watchdog_schedule_range_ns); |
4179477f PM |
656 | |
657 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
658 | { | |
2fbd3da3 | 659 | hrtimer_cancel(&wd->timer); |
4179477f PM |
660 | } |
661 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 662 | |
a94f779f | 663 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 | 664 | { |
6fe1c7a5 | 665 | struct hlist_head *h; |
9695fe6f | 666 | unsigned int i; |
6fe1c7a5 | 667 | |
9695fe6f | 668 | h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL); |
6fe1c7a5 PM |
669 | |
670 | if (h != NULL) { | |
671 | for (i = 0; i < n; i++) | |
672 | INIT_HLIST_HEAD(&h[i]); | |
673 | } | |
674 | return h; | |
675 | } | |
676 | ||
6fe1c7a5 PM |
677 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) |
678 | { | |
679 | struct Qdisc_class_common *cl; | |
b67bfe0d | 680 | struct hlist_node *next; |
6fe1c7a5 PM |
681 | struct hlist_head *nhash, *ohash; |
682 | unsigned int nsize, nmask, osize; | |
683 | unsigned int i, h; | |
684 | ||
685 | /* Rehash when load factor exceeds 0.75 */ | |
686 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
687 | return; | |
688 | nsize = clhash->hashsize * 2; | |
689 | nmask = nsize - 1; | |
690 | nhash = qdisc_class_hash_alloc(nsize); | |
691 | if (nhash == NULL) | |
692 | return; | |
693 | ||
694 | ohash = clhash->hash; | |
695 | osize = clhash->hashsize; | |
696 | ||
697 | sch_tree_lock(sch); | |
698 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 699 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
700 | h = qdisc_class_hash(cl->classid, nmask); |
701 | hlist_add_head(&cl->hnode, &nhash[h]); | |
702 | } | |
703 | } | |
704 | clhash->hash = nhash; | |
705 | clhash->hashsize = nsize; | |
706 | clhash->hashmask = nmask; | |
707 | sch_tree_unlock(sch); | |
708 | ||
9695fe6f | 709 | kvfree(ohash); |
6fe1c7a5 PM |
710 | } |
711 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
712 | ||
713 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
714 | { | |
715 | unsigned int size = 4; | |
716 | ||
717 | clhash->hash = qdisc_class_hash_alloc(size); | |
ac8ef4ab | 718 | if (!clhash->hash) |
6fe1c7a5 PM |
719 | return -ENOMEM; |
720 | clhash->hashsize = size; | |
721 | clhash->hashmask = size - 1; | |
722 | clhash->hashelems = 0; | |
723 | return 0; | |
724 | } | |
725 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
726 | ||
727 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
728 | { | |
9695fe6f | 729 | kvfree(clhash->hash); |
6fe1c7a5 PM |
730 | } |
731 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
732 | ||
733 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
734 | struct Qdisc_class_common *cl) | |
735 | { | |
736 | unsigned int h; | |
737 | ||
738 | INIT_HLIST_NODE(&cl->hnode); | |
739 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
740 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
741 | clhash->hashelems++; | |
742 | } | |
743 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
744 | ||
745 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
746 | struct Qdisc_class_common *cl) | |
747 | { | |
748 | hlist_del(&cl->hnode); | |
749 | clhash->hashelems--; | |
750 | } | |
751 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
752 | ||
fa0f5aa7 ED |
753 | /* Allocate an unique handle from space managed by kernel |
754 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
755 | */ | |
1da177e4 LT |
756 | static u32 qdisc_alloc_handle(struct net_device *dev) |
757 | { | |
fa0f5aa7 | 758 | int i = 0x8000; |
1da177e4 LT |
759 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
760 | ||
761 | do { | |
762 | autohandle += TC_H_MAKE(0x10000U, 0); | |
763 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
764 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
765 | if (!qdisc_lookup(dev, autohandle)) |
766 | return autohandle; | |
767 | cond_resched(); | |
768 | } while (--i > 0); | |
1da177e4 | 769 | |
fa0f5aa7 | 770 | return 0; |
1da177e4 LT |
771 | } |
772 | ||
5f2939d9 | 773 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len) |
43effa1e | 774 | { |
fd5ac14a | 775 | bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED; |
20fea08b | 776 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
777 | unsigned long cl; |
778 | u32 parentid; | |
95946658 | 779 | bool notify; |
2c8c8e6f | 780 | int drops; |
43effa1e | 781 | |
2ccccf5f | 782 | if (n == 0 && len == 0) |
43effa1e | 783 | return; |
2c8c8e6f | 784 | drops = max_t(int, n, 0); |
4eaf3b84 | 785 | rcu_read_lock(); |
43effa1e | 786 | while ((parentid = sch->parent)) { |
066a3b5b | 787 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 788 | break; |
066a3b5b | 789 | |
4eaf3b84 ED |
790 | if (sch->flags & TCQ_F_NOPARENT) |
791 | break; | |
95946658 KK |
792 | /* Notify parent qdisc only if child qdisc becomes empty. |
793 | * | |
794 | * If child was empty even before update then backlog | |
795 | * counter is screwed and we skip notification because | |
796 | * parent class is already passive. | |
fd5ac14a NF |
797 | * |
798 | * If the original child was offloaded then it is allowed | |
799 | * to be seem as empty, so the parent is notified anyway. | |
95946658 | 800 | */ |
fd5ac14a NF |
801 | notify = !sch->q.qlen && !WARN_ON_ONCE(!n && |
802 | !qdisc_is_offloaded); | |
4eaf3b84 | 803 | /* TODO: perform the search on a per txq basis */ |
5ce2d488 | 804 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 805 | if (sch == NULL) { |
4eaf3b84 ED |
806 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
807 | break; | |
ffc8fefa | 808 | } |
43effa1e | 809 | cops = sch->ops->cl_ops; |
95946658 | 810 | if (notify && cops->qlen_notify) { |
143976ce | 811 | cl = cops->find(sch, parentid); |
43effa1e | 812 | cops->qlen_notify(sch, cl); |
43effa1e PM |
813 | } |
814 | sch->q.qlen -= n; | |
2ccccf5f | 815 | sch->qstats.backlog -= len; |
25331d6c | 816 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 817 | } |
4eaf3b84 | 818 | rcu_read_unlock(); |
43effa1e | 819 | } |
2ccccf5f | 820 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
1da177e4 | 821 | |
b592843c JK |
822 | int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type, |
823 | void *type_data) | |
824 | { | |
825 | struct net_device *dev = qdisc_dev(sch); | |
826 | int err; | |
827 | ||
828 | sch->flags &= ~TCQ_F_OFFLOADED; | |
829 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
830 | return 0; | |
831 | ||
832 | err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data); | |
833 | if (err == -EOPNOTSUPP) | |
834 | return 0; | |
835 | ||
836 | if (!err) | |
837 | sch->flags |= TCQ_F_OFFLOADED; | |
838 | ||
839 | return err; | |
840 | } | |
841 | EXPORT_SYMBOL(qdisc_offload_dump_helper); | |
842 | ||
bfaee911 JK |
843 | void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
844 | struct Qdisc *new, struct Qdisc *old, | |
845 | enum tc_setup_type type, void *type_data, | |
846 | struct netlink_ext_ack *extack) | |
847 | { | |
848 | bool any_qdisc_is_offloaded; | |
849 | int err; | |
850 | ||
851 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
852 | return; | |
853 | ||
854 | err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data); | |
855 | ||
856 | /* Don't report error if the graft is part of destroy operation. */ | |
857 | if (!err || !new || new == &noop_qdisc) | |
858 | return; | |
859 | ||
860 | /* Don't report error if the parent, the old child and the new | |
861 | * one are not offloaded. | |
862 | */ | |
863 | any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED; | |
864 | any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED; | |
865 | any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED; | |
866 | ||
867 | if (any_qdisc_is_offloaded) | |
868 | NL_SET_ERR_MSG(extack, "Offloading graft operation failed."); | |
869 | } | |
870 | EXPORT_SYMBOL(qdisc_offload_graft_helper); | |
871 | ||
aac4daa8 VO |
872 | void qdisc_offload_query_caps(struct net_device *dev, |
873 | enum tc_setup_type type, | |
874 | void *caps, size_t caps_len) | |
875 | { | |
876 | const struct net_device_ops *ops = dev->netdev_ops; | |
877 | struct tc_query_caps_base base = { | |
878 | .type = type, | |
879 | .caps = caps, | |
880 | }; | |
881 | ||
882 | memset(caps, 0, caps_len); | |
883 | ||
884 | if (ops->ndo_setup_tc) | |
885 | ops->ndo_setup_tc(dev, TC_QUERY_CAPS, &base); | |
886 | } | |
887 | EXPORT_SYMBOL(qdisc_offload_query_caps); | |
888 | ||
98b0e5f6 JK |
889 | static void qdisc_offload_graft_root(struct net_device *dev, |
890 | struct Qdisc *new, struct Qdisc *old, | |
891 | struct netlink_ext_ack *extack) | |
892 | { | |
893 | struct tc_root_qopt_offload graft_offload = { | |
894 | .command = TC_ROOT_GRAFT, | |
895 | .handle = new ? new->handle : 0, | |
896 | .ingress = (new && new->flags & TCQ_F_INGRESS) || | |
897 | (old && old->flags & TCQ_F_INGRESS), | |
898 | }; | |
899 | ||
900 | qdisc_offload_graft_helper(dev, NULL, new, old, | |
901 | TC_SETUP_ROOT_QDISC, &graft_offload, extack); | |
902 | } | |
903 | ||
27d7f07c WC |
904 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, |
905 | u32 portid, u32 seq, u16 flags, int event) | |
906 | { | |
50dc9a85 | 907 | struct gnet_stats_basic_sync __percpu *cpu_bstats = NULL; |
27d7f07c WC |
908 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; |
909 | struct tcmsg *tcm; | |
910 | struct nlmsghdr *nlh; | |
911 | unsigned char *b = skb_tail_pointer(skb); | |
912 | struct gnet_dump d; | |
913 | struct qdisc_size_table *stab; | |
d47a6b0e | 914 | u32 block_index; |
27d7f07c WC |
915 | __u32 qlen; |
916 | ||
917 | cond_resched(); | |
918 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
919 | if (!nlh) | |
920 | goto out_nlmsg_trim; | |
921 | tcm = nlmsg_data(nlh); | |
922 | tcm->tcm_family = AF_UNSPEC; | |
923 | tcm->tcm__pad1 = 0; | |
924 | tcm->tcm__pad2 = 0; | |
925 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
926 | tcm->tcm_parent = clid; | |
927 | tcm->tcm_handle = q->handle; | |
928 | tcm->tcm_info = refcount_read(&q->refcnt); | |
929 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
930 | goto nla_put_failure; | |
d47a6b0e JP |
931 | if (q->ops->ingress_block_get) { |
932 | block_index = q->ops->ingress_block_get(q); | |
933 | if (block_index && | |
934 | nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index)) | |
935 | goto nla_put_failure; | |
936 | } | |
937 | if (q->ops->egress_block_get) { | |
938 | block_index = q->ops->egress_block_get(q); | |
939 | if (block_index && | |
940 | nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index)) | |
941 | goto nla_put_failure; | |
942 | } | |
27d7f07c WC |
943 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
944 | goto nla_put_failure; | |
44edf2f8 NF |
945 | if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED))) |
946 | goto nla_put_failure; | |
7e66016f | 947 | qlen = qdisc_qlen_sum(q); |
27d7f07c WC |
948 | |
949 | stab = rtnl_dereference(q->stab); | |
950 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
951 | goto nla_put_failure; | |
952 | ||
953 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
954 | NULL, &d, TCA_PAD) < 0) | |
955 | goto nla_put_failure; | |
956 | ||
957 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
958 | goto nla_put_failure; | |
959 | ||
960 | if (qdisc_is_percpu_stats(q)) { | |
961 | cpu_bstats = q->cpu_bstats; | |
962 | cpu_qstats = q->cpu_qstats; | |
963 | } | |
964 | ||
29cbcd85 | 965 | if (gnet_stats_copy_basic(&d, cpu_bstats, &q->bstats, true) < 0 || |
27d7f07c WC |
966 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
967 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) | |
968 | goto nla_put_failure; | |
969 | ||
970 | if (gnet_stats_finish_copy(&d) < 0) | |
971 | goto nla_put_failure; | |
972 | ||
973 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
974 | return skb->len; | |
975 | ||
976 | out_nlmsg_trim: | |
977 | nla_put_failure: | |
978 | nlmsg_trim(skb, b); | |
979 | return -1; | |
980 | } | |
981 | ||
982 | static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible) | |
983 | { | |
984 | if (q->flags & TCQ_F_BUILTIN) | |
985 | return true; | |
986 | if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible) | |
987 | return true; | |
988 | ||
989 | return false; | |
990 | } | |
991 | ||
992 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, | |
993 | struct nlmsghdr *n, u32 clid, | |
994 | struct Qdisc *old, struct Qdisc *new) | |
995 | { | |
996 | struct sk_buff *skb; | |
997 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
998 | ||
999 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1000 | if (!skb) | |
1001 | return -ENOBUFS; | |
1002 | ||
1003 | if (old && !tc_qdisc_dump_ignore(old, false)) { | |
1004 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, | |
1005 | 0, RTM_DELQDISC) < 0) | |
1006 | goto err_out; | |
1007 | } | |
1008 | if (new && !tc_qdisc_dump_ignore(new, false)) { | |
1009 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, | |
1010 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
1011 | goto err_out; | |
1012 | } | |
1013 | ||
1014 | if (skb->len) | |
1015 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1016 | n->nlmsg_flags & NLM_F_ECHO); | |
1017 | ||
1018 | err_out: | |
1019 | kfree_skb(skb); | |
1020 | return -EINVAL; | |
1021 | } | |
1022 | ||
7316ae88 TG |
1023 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
1024 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
1025 | struct Qdisc *old, struct Qdisc *new) |
1026 | { | |
1027 | if (new || old) | |
7316ae88 | 1028 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 1029 | |
4d8863a2 | 1030 | if (old) |
86bd446b | 1031 | qdisc_put(old); |
99194cff DM |
1032 | } |
1033 | ||
8a53e616 PA |
1034 | static void qdisc_clear_nolock(struct Qdisc *sch) |
1035 | { | |
1036 | sch->flags &= ~TCQ_F_NOLOCK; | |
1037 | if (!(sch->flags & TCQ_F_CPUSTATS)) | |
1038 | return; | |
1039 | ||
1040 | free_percpu(sch->cpu_bstats); | |
1041 | free_percpu(sch->cpu_qstats); | |
1042 | sch->cpu_bstats = NULL; | |
1043 | sch->cpu_qstats = NULL; | |
1044 | sch->flags &= ~TCQ_F_CPUSTATS; | |
1045 | } | |
1046 | ||
99194cff DM |
1047 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or |
1048 | * to device "dev". | |
1049 | * | |
1050 | * When appropriate send a netlink notification using 'skb' | |
1051 | * and "n". | |
1052 | * | |
1053 | * On success, destroy old qdisc. | |
1da177e4 LT |
1054 | */ |
1055 | ||
1056 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff | 1057 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
09215598 AA |
1058 | struct Qdisc *new, struct Qdisc *old, |
1059 | struct netlink_ext_ack *extack) | |
1da177e4 | 1060 | { |
99194cff | 1061 | struct Qdisc *q = old; |
7316ae88 | 1062 | struct net *net = dev_net(dev); |
1da177e4 | 1063 | |
10297b99 | 1064 | if (parent == NULL) { |
99194cff DM |
1065 | unsigned int i, num_q, ingress; |
1066 | ||
1067 | ingress = 0; | |
1068 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
1069 | if ((q && q->flags & TCQ_F_INGRESS) || |
1070 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
1071 | num_q = 1; |
1072 | ingress = 1; | |
09215598 AA |
1073 | if (!dev_ingress_queue(dev)) { |
1074 | NL_SET_ERR_MSG(extack, "Device does not have an ingress queue"); | |
24824a09 | 1075 | return -ENOENT; |
09215598 | 1076 | } |
99194cff DM |
1077 | } |
1078 | ||
1079 | if (dev->flags & IFF_UP) | |
1080 | dev_deactivate(dev); | |
1081 | ||
98b0e5f6 JK |
1082 | qdisc_offload_graft_root(dev, new, old, extack); |
1083 | ||
de2d807b | 1084 | if (new && new->ops->attach && !ingress) |
86e363dc | 1085 | goto skip; |
6ec1c69a | 1086 | |
99194cff | 1087 | for (i = 0; i < num_q; i++) { |
24824a09 | 1088 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
1089 | |
1090 | if (!ingress) | |
1091 | dev_queue = netdev_get_tx_queue(dev, i); | |
1092 | ||
8d50b53d DM |
1093 | old = dev_graft_qdisc(dev_queue, new); |
1094 | if (new && i > 0) | |
551143d8 | 1095 | qdisc_refcount_inc(new); |
8d50b53d | 1096 | |
036d6a67 | 1097 | if (!ingress) |
86bd446b | 1098 | qdisc_put(old); |
1da177e4 | 1099 | } |
99194cff | 1100 | |
86e363dc | 1101 | skip: |
036d6a67 | 1102 | if (!ingress) { |
ebda44da | 1103 | old = rtnl_dereference(dev->qdisc); |
036d6a67 | 1104 | if (new && !new->ops->attach) |
551143d8 | 1105 | qdisc_refcount_inc(new); |
5891cd5e | 1106 | rcu_assign_pointer(dev->qdisc, new ? : &noop_qdisc); |
86e363dc | 1107 | |
ebda44da ED |
1108 | notify_and_destroy(net, skb, n, classid, old, new); |
1109 | ||
86e363dc WC |
1110 | if (new && new->ops->attach) |
1111 | new->ops->attach(new); | |
036d6a67 | 1112 | } else { |
7316ae88 | 1113 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 1114 | } |
af356afa | 1115 | |
99194cff DM |
1116 | if (dev->flags & IFF_UP) |
1117 | dev_activate(dev); | |
1da177e4 | 1118 | } else { |
20fea08b | 1119 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
9da93ece JK |
1120 | unsigned long cl; |
1121 | int err; | |
1da177e4 | 1122 | |
c5ad119f | 1123 | /* Only support running class lockless if parent is lockless */ |
8eaf8d99 | 1124 | if (new && (new->flags & TCQ_F_NOLOCK) && !(parent->flags & TCQ_F_NOLOCK)) |
8a53e616 | 1125 | qdisc_clear_nolock(new); |
c5ad119f | 1126 | |
9da93ece JK |
1127 | if (!cops || !cops->graft) |
1128 | return -EOPNOTSUPP; | |
143976ce | 1129 | |
9da93ece JK |
1130 | cl = cops->find(parent, classid); |
1131 | if (!cl) { | |
1132 | NL_SET_ERR_MSG(extack, "Specified class not found"); | |
1133 | return -ENOENT; | |
1da177e4 | 1134 | } |
9da93ece JK |
1135 | |
1136 | err = cops->graft(parent, cl, new, &old, extack); | |
1137 | if (err) | |
1138 | return err; | |
1139 | notify_and_destroy(net, skb, n, classid, old, new); | |
1da177e4 | 1140 | } |
9da93ece | 1141 | return 0; |
1da177e4 LT |
1142 | } |
1143 | ||
d47a6b0e JP |
1144 | static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca, |
1145 | struct netlink_ext_ack *extack) | |
1146 | { | |
1147 | u32 block_index; | |
1148 | ||
1149 | if (tca[TCA_INGRESS_BLOCK]) { | |
1150 | block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]); | |
1151 | ||
1152 | if (!block_index) { | |
1153 | NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0"); | |
1154 | return -EINVAL; | |
1155 | } | |
1156 | if (!sch->ops->ingress_block_set) { | |
1157 | NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported"); | |
1158 | return -EOPNOTSUPP; | |
1159 | } | |
1160 | sch->ops->ingress_block_set(sch, block_index); | |
1161 | } | |
1162 | if (tca[TCA_EGRESS_BLOCK]) { | |
1163 | block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]); | |
1164 | ||
1165 | if (!block_index) { | |
1166 | NL_SET_ERR_MSG(extack, "Egress block index cannot be 0"); | |
1167 | return -EINVAL; | |
1168 | } | |
1169 | if (!sch->ops->egress_block_set) { | |
1170 | NL_SET_ERR_MSG(extack, "Egress block sharing is not supported"); | |
1171 | return -EOPNOTSUPP; | |
1172 | } | |
1173 | sch->ops->egress_block_set(sch, block_index); | |
1174 | } | |
1175 | return 0; | |
1176 | } | |
1177 | ||
1da177e4 LT |
1178 | /* |
1179 | Allocate and initialize new qdisc. | |
1180 | ||
1181 | Parameters are passed via opt. | |
1182 | */ | |
1183 | ||
5a7a5555 JHS |
1184 | static struct Qdisc *qdisc_create(struct net_device *dev, |
1185 | struct netdev_queue *dev_queue, | |
cfc111d5 | 1186 | u32 parent, u32 handle, |
09215598 AA |
1187 | struct nlattr **tca, int *errp, |
1188 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1189 | { |
1190 | int err; | |
1e90474c | 1191 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
1192 | struct Qdisc *sch; |
1193 | struct Qdisc_ops *ops; | |
175f9c1b | 1194 | struct qdisc_size_table *stab; |
1da177e4 LT |
1195 | |
1196 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 1197 | #ifdef CONFIG_MODULES |
1da177e4 LT |
1198 | if (ops == NULL && kind != NULL) { |
1199 | char name[IFNAMSIZ]; | |
872f6903 | 1200 | if (nla_strscpy(name, kind, IFNAMSIZ) >= 0) { |
1da177e4 LT |
1201 | /* We dropped the RTNL semaphore in order to |
1202 | * perform the module load. So, even if we | |
1203 | * succeeded in loading the module we have to | |
1204 | * tell the caller to replay the request. We | |
1205 | * indicate this using -EAGAIN. | |
1206 | * We replay the request because the device may | |
1207 | * go away in the mean time. | |
1208 | */ | |
1209 | rtnl_unlock(); | |
1210 | request_module("sch_%s", name); | |
1211 | rtnl_lock(); | |
1212 | ops = qdisc_lookup_ops(kind); | |
1213 | if (ops != NULL) { | |
1214 | /* We will try again qdisc_lookup_ops, | |
1215 | * so don't keep a reference. | |
1216 | */ | |
1217 | module_put(ops->owner); | |
1218 | err = -EAGAIN; | |
1219 | goto err_out; | |
1220 | } | |
1221 | } | |
1222 | } | |
1223 | #endif | |
1224 | ||
b9e2cc0f | 1225 | err = -ENOENT; |
09215598 | 1226 | if (!ops) { |
973bf8fd | 1227 | NL_SET_ERR_MSG(extack, "Specified qdisc kind is unknown"); |
1da177e4 | 1228 | goto err_out; |
09215598 | 1229 | } |
1da177e4 | 1230 | |
d0bd684d | 1231 | sch = qdisc_alloc(dev_queue, ops, extack); |
3d54b82f TG |
1232 | if (IS_ERR(sch)) { |
1233 | err = PTR_ERR(sch); | |
1da177e4 | 1234 | goto err_out2; |
3d54b82f | 1235 | } |
1da177e4 | 1236 | |
ffc8fefa PM |
1237 | sch->parent = parent; |
1238 | ||
3d54b82f | 1239 | if (handle == TC_H_INGRESS) { |
1da177e4 | 1240 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 1241 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
fd44de7c | 1242 | } else { |
fd44de7c PM |
1243 | if (handle == 0) { |
1244 | handle = qdisc_alloc_handle(dev); | |
aaeb1dea IV |
1245 | if (handle == 0) { |
1246 | NL_SET_ERR_MSG(extack, "Maximum number of qdisc handles was exceeded"); | |
1247 | err = -ENOSPC; | |
fd44de7c | 1248 | goto err_out3; |
aaeb1dea | 1249 | } |
fd44de7c | 1250 | } |
1abbe139 | 1251 | if (!netif_is_multiqueue(dev)) |
225734de | 1252 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
1253 | } |
1254 | ||
3d54b82f | 1255 | sch->handle = handle; |
1da177e4 | 1256 | |
84c46dd8 JDB |
1257 | /* This exist to keep backward compatible with a userspace |
1258 | * loophole, what allowed userspace to get IFF_NO_QUEUE | |
1259 | * facility on older kernels by setting tx_queue_len=0 (prior | |
1260 | * to qdisc init), and then forgot to reinit tx_queue_len | |
1261 | * before again attaching a qdisc. | |
1262 | */ | |
1263 | if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { | |
1264 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; | |
1265 | netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); | |
1266 | } | |
1267 | ||
d47a6b0e JP |
1268 | err = qdisc_block_indexes_set(sch, tca, extack); |
1269 | if (err) | |
1270 | goto err_out3; | |
1271 | ||
54160ef6 | 1272 | if (ops->init) { |
e63d7dfd | 1273 | err = ops->init(sch, tca[TCA_OPTIONS], extack); |
54160ef6 AA |
1274 | if (err != 0) |
1275 | goto err_out5; | |
1276 | } | |
22e0f8b9 | 1277 | |
54160ef6 | 1278 | if (tca[TCA_STAB]) { |
09215598 | 1279 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
54160ef6 AA |
1280 | if (IS_ERR(stab)) { |
1281 | err = PTR_ERR(stab); | |
1282 | goto err_out4; | |
023e09a7 | 1283 | } |
54160ef6 AA |
1284 | rcu_assign_pointer(sch->stab, stab); |
1285 | } | |
1286 | if (tca[TCA_RATE]) { | |
54160ef6 | 1287 | err = -EOPNOTSUPP; |
09215598 AA |
1288 | if (sch->flags & TCQ_F_MQROOT) { |
1289 | NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc"); | |
54160ef6 | 1290 | goto err_out4; |
09215598 | 1291 | } |
1da177e4 | 1292 | |
54160ef6 AA |
1293 | err = gen_new_estimator(&sch->bstats, |
1294 | sch->cpu_bstats, | |
1295 | &sch->rate_est, | |
1296 | NULL, | |
29cbcd85 | 1297 | true, |
54160ef6 | 1298 | tca[TCA_RATE]); |
09215598 AA |
1299 | if (err) { |
1300 | NL_SET_ERR_MSG(extack, "Failed to generate new estimator"); | |
54160ef6 | 1301 | goto err_out4; |
09215598 | 1302 | } |
1da177e4 | 1303 | } |
54160ef6 AA |
1304 | |
1305 | qdisc_hash_add(sch, false); | |
f5a7833e | 1306 | trace_qdisc_create(ops, dev, parent); |
54160ef6 AA |
1307 | |
1308 | return sch; | |
1309 | ||
1310 | err_out5: | |
87b60cfa | 1311 | /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ |
c1a4872e GF |
1312 | if (ops->destroy) |
1313 | ops->destroy(sch); | |
1da177e4 | 1314 | err_out3: |
d62607c3 | 1315 | netdev_put(dev, &sch->dev_tracker); |
81d947e2 | 1316 | qdisc_free(sch); |
1da177e4 LT |
1317 | err_out2: |
1318 | module_put(ops->owner); | |
1319 | err_out: | |
1320 | *errp = err; | |
1da177e4 | 1321 | return NULL; |
23bcf634 PM |
1322 | |
1323 | err_out4: | |
1324 | /* | |
1325 | * Any broken qdiscs that would require a ops->reset() here? | |
1326 | * The qdisc was never in action so it shouldn't be necessary. | |
1327 | */ | |
a2da570d | 1328 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1329 | if (ops->destroy) |
1330 | ops->destroy(sch); | |
1331 | goto err_out3; | |
1da177e4 LT |
1332 | } |
1333 | ||
09215598 AA |
1334 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca, |
1335 | struct netlink_ext_ack *extack) | |
1da177e4 | 1336 | { |
a2da570d | 1337 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1338 | int err = 0; |
1da177e4 | 1339 | |
175f9c1b | 1340 | if (tca[TCA_OPTIONS]) { |
09215598 AA |
1341 | if (!sch->ops->change) { |
1342 | NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc"); | |
1da177e4 | 1343 | return -EINVAL; |
09215598 | 1344 | } |
d47a6b0e JP |
1345 | if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) { |
1346 | NL_SET_ERR_MSG(extack, "Change of blocks is not supported"); | |
1347 | return -EOPNOTSUPP; | |
1348 | } | |
2030721c | 1349 | err = sch->ops->change(sch, tca[TCA_OPTIONS], extack); |
1da177e4 LT |
1350 | if (err) |
1351 | return err; | |
1352 | } | |
175f9c1b JK |
1353 | |
1354 | if (tca[TCA_STAB]) { | |
09215598 | 1355 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
175f9c1b JK |
1356 | if (IS_ERR(stab)) |
1357 | return PTR_ERR(stab); | |
1358 | } | |
1359 | ||
a2da570d ED |
1360 | ostab = rtnl_dereference(sch->stab); |
1361 | rcu_assign_pointer(sch->stab, stab); | |
1362 | qdisc_put_stab(ostab); | |
175f9c1b | 1363 | |
23bcf634 | 1364 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1365 | /* NB: ignores errors from replace_estimator |
1366 | because change can't be undone. */ | |
23bcf634 PM |
1367 | if (sch->flags & TCQ_F_MQROOT) |
1368 | goto out; | |
22e0f8b9 JF |
1369 | gen_replace_estimator(&sch->bstats, |
1370 | sch->cpu_bstats, | |
1371 | &sch->rate_est, | |
edb09eb1 | 1372 | NULL, |
29cbcd85 | 1373 | true, |
22e0f8b9 | 1374 | tca[TCA_RATE]); |
23bcf634 PM |
1375 | } |
1376 | out: | |
1da177e4 LT |
1377 | return 0; |
1378 | } | |
1379 | ||
cc7ec456 ED |
1380 | struct check_loop_arg { |
1381 | struct qdisc_walker w; | |
1da177e4 LT |
1382 | struct Qdisc *p; |
1383 | int depth; | |
1384 | }; | |
1385 | ||
5a7a5555 JHS |
1386 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, |
1387 | struct qdisc_walker *w); | |
1da177e4 LT |
1388 | |
1389 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1390 | { | |
1391 | struct check_loop_arg arg; | |
1392 | ||
1393 | if (q->ops->cl_ops == NULL) | |
1394 | return 0; | |
1395 | ||
1396 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1397 | arg.w.fn = check_loop_fn; | |
1398 | arg.depth = depth; | |
1399 | arg.p = p; | |
1400 | q->ops->cl_ops->walk(q, &arg.w); | |
1401 | return arg.w.stop ? -ELOOP : 0; | |
1402 | } | |
1403 | ||
1404 | static int | |
1405 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1406 | { | |
1407 | struct Qdisc *leaf; | |
20fea08b | 1408 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1409 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1410 | ||
1411 | leaf = cops->leaf(q, cl); | |
1412 | if (leaf) { | |
1413 | if (leaf == arg->p || arg->depth > 7) | |
1414 | return -ELOOP; | |
1415 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1416 | } | |
1417 | return 0; | |
1418 | } | |
1419 | ||
8b4c3cdd | 1420 | const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = { |
6f96c3c6 | 1421 | [TCA_KIND] = { .type = NLA_STRING }, |
8b4c3cdd DA |
1422 | [TCA_RATE] = { .type = NLA_BINARY, |
1423 | .len = sizeof(struct tc_estimator) }, | |
1424 | [TCA_STAB] = { .type = NLA_NESTED }, | |
1425 | [TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG }, | |
1426 | [TCA_CHAIN] = { .type = NLA_U32 }, | |
1427 | [TCA_INGRESS_BLOCK] = { .type = NLA_U32 }, | |
1428 | [TCA_EGRESS_BLOCK] = { .type = NLA_U32 }, | |
1429 | }; | |
1430 | ||
e331473f DC |
1431 | /* |
1432 | * Delete/get qdisc. | |
1433 | */ | |
1434 | ||
c21ef3e3 DA |
1435 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1436 | struct netlink_ext_ack *extack) | |
1da177e4 | 1437 | { |
3b1e0a65 | 1438 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1439 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1440 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1441 | struct net_device *dev; |
de179c8c | 1442 | u32 clid; |
1da177e4 LT |
1443 | struct Qdisc *q = NULL; |
1444 | struct Qdisc *p = NULL; | |
1445 | int err; | |
1446 | ||
8cb08174 JB |
1447 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1448 | rtm_tca_policy, extack); | |
1e90474c PM |
1449 | if (err < 0) |
1450 | return err; | |
1451 | ||
de179c8c H |
1452 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1453 | if (!dev) | |
1454 | return -ENODEV; | |
1455 | ||
1456 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1457 | if (clid) { |
1458 | if (clid != TC_H_ROOT) { | |
1459 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 | 1460 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1461 | if (!p) { |
1462 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid"); | |
1da177e4 | 1463 | return -ENOENT; |
09215598 | 1464 | } |
1da177e4 | 1465 | q = qdisc_leaf(p, clid); |
cc7ec456 ED |
1466 | } else if (dev_ingress_queue(dev)) { |
1467 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1468 | } |
1da177e4 | 1469 | } else { |
5891cd5e | 1470 | q = rtnl_dereference(dev->qdisc); |
1da177e4 | 1471 | } |
09215598 AA |
1472 | if (!q) { |
1473 | NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device"); | |
1da177e4 | 1474 | return -ENOENT; |
09215598 | 1475 | } |
1da177e4 | 1476 | |
09215598 AA |
1477 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) { |
1478 | NL_SET_ERR_MSG(extack, "Invalid handle"); | |
1da177e4 | 1479 | return -EINVAL; |
09215598 | 1480 | } |
1da177e4 | 1481 | } else { |
cc7ec456 | 1482 | q = qdisc_lookup(dev, tcm->tcm_handle); |
09215598 AA |
1483 | if (!q) { |
1484 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle"); | |
1da177e4 | 1485 | return -ENOENT; |
09215598 | 1486 | } |
1da177e4 LT |
1487 | } |
1488 | ||
09215598 AA |
1489 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1490 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1491 | return -EINVAL; |
09215598 | 1492 | } |
1da177e4 LT |
1493 | |
1494 | if (n->nlmsg_type == RTM_DELQDISC) { | |
09215598 AA |
1495 | if (!clid) { |
1496 | NL_SET_ERR_MSG(extack, "Classid cannot be zero"); | |
1da177e4 | 1497 | return -EINVAL; |
09215598 AA |
1498 | } |
1499 | if (q->handle == 0) { | |
1500 | NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero"); | |
1da177e4 | 1501 | return -ENOENT; |
09215598 AA |
1502 | } |
1503 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack); | |
cc7ec456 | 1504 | if (err != 0) |
1da177e4 | 1505 | return err; |
1da177e4 | 1506 | } else { |
7316ae88 | 1507 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1508 | } |
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | /* | |
cc7ec456 | 1513 | * Create/change qdisc. |
1da177e4 LT |
1514 | */ |
1515 | ||
c21ef3e3 DA |
1516 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1517 | struct netlink_ext_ack *extack) | |
1da177e4 | 1518 | { |
3b1e0a65 | 1519 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1520 | struct tcmsg *tcm; |
1e90474c | 1521 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1522 | struct net_device *dev; |
1523 | u32 clid; | |
1524 | struct Qdisc *q, *p; | |
1525 | int err; | |
1526 | ||
1527 | replay: | |
1528 | /* Reinit, just in case something touches this. */ | |
8cb08174 JB |
1529 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1530 | rtm_tca_policy, extack); | |
de179c8c H |
1531 | if (err < 0) |
1532 | return err; | |
1533 | ||
02ef22ca | 1534 | tcm = nlmsg_data(n); |
1da177e4 LT |
1535 | clid = tcm->tcm_parent; |
1536 | q = p = NULL; | |
1537 | ||
cc7ec456 ED |
1538 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1539 | if (!dev) | |
1da177e4 LT |
1540 | return -ENODEV; |
1541 | ||
1e90474c | 1542 | |
1da177e4 LT |
1543 | if (clid) { |
1544 | if (clid != TC_H_ROOT) { | |
1545 | if (clid != TC_H_INGRESS) { | |
cc7ec456 | 1546 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1547 | if (!p) { |
1548 | NL_SET_ERR_MSG(extack, "Failed to find specified qdisc"); | |
1da177e4 | 1549 | return -ENOENT; |
09215598 | 1550 | } |
1da177e4 | 1551 | q = qdisc_leaf(p, clid); |
cc7ec456 ED |
1552 | } else if (dev_ingress_queue_create(dev)) { |
1553 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1554 | } |
1555 | } else { | |
5891cd5e | 1556 | q = rtnl_dereference(dev->qdisc); |
1da177e4 LT |
1557 | } |
1558 | ||
1559 | /* It may be default qdisc, ignore it */ | |
1560 | if (q && q->handle == 0) | |
1561 | q = NULL; | |
1562 | ||
1563 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1564 | if (tcm->tcm_handle) { | |
09215598 AA |
1565 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) { |
1566 | NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override"); | |
1da177e4 | 1567 | return -EEXIST; |
09215598 AA |
1568 | } |
1569 | if (TC_H_MIN(tcm->tcm_handle)) { | |
1570 | NL_SET_ERR_MSG(extack, "Invalid minor handle"); | |
1da177e4 | 1571 | return -EINVAL; |
09215598 | 1572 | } |
cc7ec456 | 1573 | q = qdisc_lookup(dev, tcm->tcm_handle); |
8ec69574 | 1574 | if (!q) |
1da177e4 | 1575 | goto create_n_graft; |
09215598 AA |
1576 | if (n->nlmsg_flags & NLM_F_EXCL) { |
1577 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override"); | |
1da177e4 | 1578 | return -EEXIST; |
09215598 | 1579 | } |
0ac4bd68 | 1580 | if (tca[TCA_KIND] && |
09215598 AA |
1581 | nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1582 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1583 | return -EINVAL; |
09215598 | 1584 | } |
1da177e4 | 1585 | if (q == p || |
09215598 AA |
1586 | (p && check_loop(q, p, 0))) { |
1587 | NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected"); | |
1da177e4 | 1588 | return -ELOOP; |
09215598 | 1589 | } |
551143d8 | 1590 | qdisc_refcount_inc(q); |
1da177e4 LT |
1591 | goto graft; |
1592 | } else { | |
cc7ec456 | 1593 | if (!q) |
1da177e4 LT |
1594 | goto create_n_graft; |
1595 | ||
1596 | /* This magic test requires explanation. | |
1597 | * | |
1598 | * We know, that some child q is already | |
1599 | * attached to this parent and have choice: | |
1600 | * either to change it or to create/graft new one. | |
1601 | * | |
1602 | * 1. We are allowed to create/graft only | |
1603 | * if CREATE and REPLACE flags are set. | |
1604 | * | |
1605 | * 2. If EXCL is set, requestor wanted to say, | |
1606 | * that qdisc tcm_handle is not expected | |
1607 | * to exist, so that we choose create/graft too. | |
1608 | * | |
1609 | * 3. The last case is when no flags are set. | |
1610 | * Alas, it is sort of hole in API, we | |
1611 | * cannot decide what to do unambiguously. | |
1612 | * For now we select create/graft, if | |
1613 | * user gave KIND, which does not match existing. | |
1614 | */ | |
cc7ec456 ED |
1615 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1616 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1617 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1618 | (tca[TCA_KIND] && |
1619 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1620 | goto create_n_graft; |
1621 | } | |
1622 | } | |
1623 | } else { | |
09215598 AA |
1624 | if (!tcm->tcm_handle) { |
1625 | NL_SET_ERR_MSG(extack, "Handle cannot be zero"); | |
1da177e4 | 1626 | return -EINVAL; |
09215598 | 1627 | } |
1da177e4 LT |
1628 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1629 | } | |
1630 | ||
1631 | /* Change qdisc parameters */ | |
09215598 AA |
1632 | if (!q) { |
1633 | NL_SET_ERR_MSG(extack, "Specified qdisc not found"); | |
1da177e4 | 1634 | return -ENOENT; |
09215598 AA |
1635 | } |
1636 | if (n->nlmsg_flags & NLM_F_EXCL) { | |
1637 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify"); | |
1da177e4 | 1638 | return -EEXIST; |
09215598 AA |
1639 | } |
1640 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { | |
1641 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1642 | return -EINVAL; |
09215598 AA |
1643 | } |
1644 | err = qdisc_change(q, tca, extack); | |
1da177e4 | 1645 | if (err == 0) |
7316ae88 | 1646 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1647 | return err; |
1648 | ||
1649 | create_n_graft: | |
09215598 AA |
1650 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
1651 | NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag"); | |
1da177e4 | 1652 | return -ENOENT; |
09215598 | 1653 | } |
24824a09 | 1654 | if (clid == TC_H_INGRESS) { |
09215598 | 1655 | if (dev_ingress_queue(dev)) { |
cfc111d5 | 1656 | q = qdisc_create(dev, dev_ingress_queue(dev), |
24824a09 | 1657 | tcm->tcm_parent, tcm->tcm_parent, |
09215598 AA |
1658 | tca, &err, extack); |
1659 | } else { | |
1660 | NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device"); | |
24824a09 | 1661 | err = -ENOENT; |
09215598 | 1662 | } |
24824a09 | 1663 | } else { |
926e61b7 | 1664 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1665 | |
1666 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1667 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1668 | else if (p) | |
1669 | dev_queue = p->dev_queue; | |
1670 | else | |
1671 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1672 | |
cfc111d5 | 1673 | q = qdisc_create(dev, dev_queue, |
bb949fbd | 1674 | tcm->tcm_parent, tcm->tcm_handle, |
09215598 | 1675 | tca, &err, extack); |
6ec1c69a | 1676 | } |
1da177e4 LT |
1677 | if (q == NULL) { |
1678 | if (err == -EAGAIN) | |
1679 | goto replay; | |
1680 | return err; | |
1681 | } | |
1682 | ||
1683 | graft: | |
09215598 | 1684 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack); |
e5befbd9 IJ |
1685 | if (err) { |
1686 | if (q) | |
86bd446b | 1687 | qdisc_put(q); |
e5befbd9 | 1688 | return err; |
1da177e4 | 1689 | } |
e5befbd9 | 1690 | |
1da177e4 LT |
1691 | return 0; |
1692 | } | |
1693 | ||
30723673 DM |
1694 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1695 | struct netlink_callback *cb, | |
49b49971 JK |
1696 | int *q_idx_p, int s_q_idx, bool recur, |
1697 | bool dump_invisible) | |
30723673 DM |
1698 | { |
1699 | int ret = 0, q_idx = *q_idx_p; | |
1700 | struct Qdisc *q; | |
59cc1f61 | 1701 | int b; |
30723673 DM |
1702 | |
1703 | if (!root) | |
1704 | return 0; | |
1705 | ||
1706 | q = root; | |
1707 | if (q_idx < s_q_idx) { | |
1708 | q_idx++; | |
1709 | } else { | |
49b49971 | 1710 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1711 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1712 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1713 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1714 | goto done; |
1715 | q_idx++; | |
1716 | } | |
69012ae4 | 1717 | |
ea327469 JK |
1718 | /* If dumping singletons, there is no qdisc_dev(root) and the singleton |
1719 | * itself has already been dumped. | |
1720 | * | |
1721 | * If we've already dumped the top-level (ingress) qdisc above and the global | |
1722 | * qdisc hashtable, we don't want to hit it again | |
1723 | */ | |
1724 | if (!qdisc_dev(root) || !recur) | |
69012ae4 JK |
1725 | goto out; |
1726 | ||
59cc1f61 | 1727 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1728 | if (q_idx < s_q_idx) { |
1729 | q_idx++; | |
1730 | continue; | |
1731 | } | |
49b49971 | 1732 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1733 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1734 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1735 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1736 | goto done; |
1737 | q_idx++; | |
1738 | } | |
1739 | ||
1740 | out: | |
1741 | *q_idx_p = q_idx; | |
1742 | return ret; | |
1743 | done: | |
1744 | ret = -1; | |
1745 | goto out; | |
1746 | } | |
1747 | ||
1da177e4 LT |
1748 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1749 | { | |
3b1e0a65 | 1750 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1751 | int idx, q_idx; |
1752 | int s_idx, s_q_idx; | |
1753 | struct net_device *dev; | |
49b49971 | 1754 | const struct nlmsghdr *nlh = cb->nlh; |
49b49971 JK |
1755 | struct nlattr *tca[TCA_MAX + 1]; |
1756 | int err; | |
1da177e4 LT |
1757 | |
1758 | s_idx = cb->args[0]; | |
1759 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1760 | |
7562f876 | 1761 | idx = 0; |
15dc36eb | 1762 | ASSERT_RTNL(); |
49b49971 | 1763 | |
8cb08174 JB |
1764 | err = nlmsg_parse_deprecated(nlh, sizeof(struct tcmsg), tca, TCA_MAX, |
1765 | rtm_tca_policy, cb->extack); | |
49b49971 JK |
1766 | if (err < 0) |
1767 | return err; | |
1768 | ||
15dc36eb | 1769 | for_each_netdev(net, dev) { |
30723673 DM |
1770 | struct netdev_queue *dev_queue; |
1771 | ||
1da177e4 | 1772 | if (idx < s_idx) |
7562f876 | 1773 | goto cont; |
1da177e4 LT |
1774 | if (idx > s_idx) |
1775 | s_q_idx = 0; | |
1da177e4 | 1776 | q_idx = 0; |
30723673 | 1777 | |
5891cd5e ED |
1778 | if (tc_dump_qdisc_root(rtnl_dereference(dev->qdisc), |
1779 | skb, cb, &q_idx, s_q_idx, | |
49b49971 | 1780 | true, tca[TCA_DUMP_INVISIBLE]) < 0) |
30723673 DM |
1781 | goto done; |
1782 | ||
24824a09 ED |
1783 | dev_queue = dev_ingress_queue(dev); |
1784 | if (dev_queue && | |
1785 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
49b49971 JK |
1786 | &q_idx, s_q_idx, false, |
1787 | tca[TCA_DUMP_INVISIBLE]) < 0) | |
30723673 DM |
1788 | goto done; |
1789 | ||
7562f876 PE |
1790 | cont: |
1791 | idx++; | |
1da177e4 LT |
1792 | } |
1793 | ||
1794 | done: | |
1da177e4 LT |
1795 | cb->args[0] = idx; |
1796 | cb->args[1] = q_idx; | |
1797 | ||
1798 | return skb->len; | |
1799 | } | |
1800 | ||
1801 | ||
1802 | ||
1803 | /************************************************ | |
1804 | * Traffic classes manipulation. * | |
1805 | ************************************************/ | |
1806 | ||
27d7f07c WC |
1807 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, |
1808 | unsigned long cl, | |
1809 | u32 portid, u32 seq, u16 flags, int event) | |
1810 | { | |
1811 | struct tcmsg *tcm; | |
1812 | struct nlmsghdr *nlh; | |
1813 | unsigned char *b = skb_tail_pointer(skb); | |
1814 | struct gnet_dump d; | |
1815 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; | |
1da177e4 | 1816 | |
27d7f07c WC |
1817 | cond_resched(); |
1818 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1819 | if (!nlh) | |
1820 | goto out_nlmsg_trim; | |
1821 | tcm = nlmsg_data(nlh); | |
1822 | tcm->tcm_family = AF_UNSPEC; | |
1823 | tcm->tcm__pad1 = 0; | |
1824 | tcm->tcm__pad2 = 0; | |
1825 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1826 | tcm->tcm_parent = q->handle; | |
1827 | tcm->tcm_handle = q->handle; | |
1828 | tcm->tcm_info = 0; | |
1829 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
1830 | goto nla_put_failure; | |
1831 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) | |
1832 | goto nla_put_failure; | |
1833 | ||
1834 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
1835 | NULL, &d, TCA_PAD) < 0) | |
1836 | goto nla_put_failure; | |
1837 | ||
1838 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1839 | goto nla_put_failure; | |
1840 | ||
1841 | if (gnet_stats_finish_copy(&d) < 0) | |
1842 | goto nla_put_failure; | |
1843 | ||
1844 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; | |
1845 | return skb->len; | |
1846 | ||
1847 | out_nlmsg_trim: | |
1848 | nla_put_failure: | |
1849 | nlmsg_trim(skb, b); | |
1850 | return -1; | |
1851 | } | |
1852 | ||
1853 | static int tclass_notify(struct net *net, struct sk_buff *oskb, | |
1854 | struct nlmsghdr *n, struct Qdisc *q, | |
1855 | unsigned long cl, int event) | |
1856 | { | |
1857 | struct sk_buff *skb; | |
1858 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1859 | ||
1860 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1861 | if (!skb) | |
1862 | return -ENOBUFS; | |
1863 | ||
1864 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { | |
1865 | kfree_skb(skb); | |
1866 | return -EINVAL; | |
1867 | } | |
1868 | ||
f79a3bcb YD |
1869 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1870 | n->nlmsg_flags & NLM_F_ECHO); | |
27d7f07c | 1871 | } |
1da177e4 | 1872 | |
14546ba1 WC |
1873 | static int tclass_del_notify(struct net *net, |
1874 | const struct Qdisc_class_ops *cops, | |
1875 | struct sk_buff *oskb, struct nlmsghdr *n, | |
4dd78a73 MM |
1876 | struct Qdisc *q, unsigned long cl, |
1877 | struct netlink_ext_ack *extack) | |
14546ba1 WC |
1878 | { |
1879 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1880 | struct sk_buff *skb; | |
1881 | int err = 0; | |
1882 | ||
1883 | if (!cops->delete) | |
1884 | return -EOPNOTSUPP; | |
1885 | ||
1886 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1887 | if (!skb) | |
1888 | return -ENOBUFS; | |
1889 | ||
1890 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, | |
1891 | RTM_DELTCLASS) < 0) { | |
1892 | kfree_skb(skb); | |
1893 | return -EINVAL; | |
1894 | } | |
1895 | ||
4dd78a73 | 1896 | err = cops->delete(q, cl, extack); |
14546ba1 WC |
1897 | if (err) { |
1898 | kfree_skb(skb); | |
1899 | return err; | |
1900 | } | |
1901 | ||
5b5f99b1 ZW |
1902 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1903 | n->nlmsg_flags & NLM_F_ECHO); | |
5b5f99b1 | 1904 | return err; |
14546ba1 WC |
1905 | } |
1906 | ||
07d79fc7 CW |
1907 | #ifdef CONFIG_NET_CLS |
1908 | ||
1909 | struct tcf_bind_args { | |
1910 | struct tcf_walker w; | |
2e24cd75 | 1911 | unsigned long base; |
07d79fc7 | 1912 | unsigned long cl; |
2e24cd75 | 1913 | u32 classid; |
07d79fc7 CW |
1914 | }; |
1915 | ||
1916 | static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg) | |
1917 | { | |
1918 | struct tcf_bind_args *a = (void *)arg; | |
1919 | ||
4e6263ec | 1920 | if (n && tp->ops->bind_class) { |
74e3be60 JP |
1921 | struct Qdisc *q = tcf_block_q(tp->chain->block); |
1922 | ||
1923 | sch_tree_lock(q); | |
2e24cd75 | 1924 | tp->ops->bind_class(n, a->classid, a->cl, q, a->base); |
74e3be60 | 1925 | sch_tree_unlock(q); |
07d79fc7 CW |
1926 | } |
1927 | return 0; | |
1928 | } | |
1929 | ||
760d228e CW |
1930 | struct tc_bind_class_args { |
1931 | struct qdisc_walker w; | |
1932 | unsigned long new_cl; | |
1933 | u32 portid; | |
1934 | u32 clid; | |
1935 | }; | |
1936 | ||
1937 | static int tc_bind_class_walker(struct Qdisc *q, unsigned long cl, | |
1938 | struct qdisc_walker *w) | |
07d79fc7 | 1939 | { |
760d228e | 1940 | struct tc_bind_class_args *a = (struct tc_bind_class_args *)w; |
07d79fc7 CW |
1941 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1942 | struct tcf_block *block; | |
1943 | struct tcf_chain *chain; | |
07d79fc7 | 1944 | |
cbaacc4e | 1945 | block = cops->tcf_block(q, cl, NULL); |
07d79fc7 | 1946 | if (!block) |
760d228e | 1947 | return 0; |
bbf73830 VB |
1948 | for (chain = tcf_get_next_chain(block, NULL); |
1949 | chain; | |
1950 | chain = tcf_get_next_chain(block, chain)) { | |
07d79fc7 CW |
1951 | struct tcf_proto *tp; |
1952 | ||
0fca55ed VB |
1953 | for (tp = tcf_get_next_proto(chain, NULL); |
1954 | tp; tp = tcf_get_next_proto(chain, tp)) { | |
07d79fc7 CW |
1955 | struct tcf_bind_args arg = {}; |
1956 | ||
1957 | arg.w.fn = tcf_node_bind; | |
760d228e | 1958 | arg.classid = a->clid; |
2e24cd75 | 1959 | arg.base = cl; |
760d228e | 1960 | arg.cl = a->new_cl; |
12db03b6 | 1961 | tp->ops->walk(tp, &arg.w, true); |
07d79fc7 CW |
1962 | } |
1963 | } | |
760d228e CW |
1964 | |
1965 | return 0; | |
1966 | } | |
1967 | ||
1968 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
1969 | unsigned long new_cl) | |
1970 | { | |
1971 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
1972 | struct tc_bind_class_args args = {}; | |
1973 | ||
1974 | if (!cops->tcf_block) | |
1975 | return; | |
1976 | args.portid = portid; | |
1977 | args.clid = clid; | |
1978 | args.new_cl = new_cl; | |
1979 | args.w.fn = tc_bind_class_walker; | |
1980 | q->ops->cl_ops->walk(q, &args.w); | |
07d79fc7 CW |
1981 | } |
1982 | ||
1983 | #else | |
1984 | ||
1985 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
1986 | unsigned long new_cl) | |
1987 | { | |
1988 | } | |
1989 | ||
1990 | #endif | |
1991 | ||
c21ef3e3 DA |
1992 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, |
1993 | struct netlink_ext_ack *extack) | |
1da177e4 | 1994 | { |
3b1e0a65 | 1995 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1996 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1997 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1998 | struct net_device *dev; |
1999 | struct Qdisc *q = NULL; | |
20fea08b | 2000 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
2001 | unsigned long cl = 0; |
2002 | unsigned long new_cl; | |
de179c8c H |
2003 | u32 portid; |
2004 | u32 clid; | |
2005 | u32 qid; | |
1da177e4 LT |
2006 | int err; |
2007 | ||
8cb08174 JB |
2008 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
2009 | rtm_tca_policy, extack); | |
1e90474c PM |
2010 | if (err < 0) |
2011 | return err; | |
2012 | ||
de179c8c H |
2013 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
2014 | if (!dev) | |
2015 | return -ENODEV; | |
2016 | ||
1da177e4 LT |
2017 | /* |
2018 | parent == TC_H_UNSPEC - unspecified parent. | |
2019 | parent == TC_H_ROOT - class is root, which has no parent. | |
2020 | parent == X:0 - parent is root class. | |
2021 | parent == X:Y - parent is a node in hierarchy. | |
2022 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
2023 | ||
2024 | handle == 0:0 - generate handle from kernel pool. | |
2025 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
2026 | handle == X:Y - clear. | |
2027 | handle == X:0 - root class. | |
2028 | */ | |
2029 | ||
2030 | /* Step 1. Determine qdisc handle X:0 */ | |
2031 | ||
de179c8c H |
2032 | portid = tcm->tcm_parent; |
2033 | clid = tcm->tcm_handle; | |
2034 | qid = TC_H_MAJ(clid); | |
2035 | ||
15e47304 EB |
2036 | if (portid != TC_H_ROOT) { |
2037 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
2038 | |
2039 | if (qid && qid1) { | |
2040 | /* If both majors are known, they must be identical. */ | |
2041 | if (qid != qid1) | |
2042 | return -EINVAL; | |
2043 | } else if (qid1) { | |
2044 | qid = qid1; | |
2045 | } else if (qid == 0) | |
5891cd5e | 2046 | qid = rtnl_dereference(dev->qdisc)->handle; |
1da177e4 LT |
2047 | |
2048 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
2049 | * both with parent and child. |
2050 | * | |
15e47304 | 2051 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 2052 | */ |
15e47304 EB |
2053 | if (portid) |
2054 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
2055 | } else { |
2056 | if (qid == 0) | |
5891cd5e | 2057 | qid = rtnl_dereference(dev->qdisc)->handle; |
1da177e4 LT |
2058 | } |
2059 | ||
2060 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
2061 | q = qdisc_lookup(dev, qid); |
2062 | if (!q) | |
1da177e4 LT |
2063 | return -ENOENT; |
2064 | ||
2065 | /* An check that it supports classes */ | |
2066 | cops = q->ops->cl_ops; | |
2067 | if (cops == NULL) | |
2068 | return -EINVAL; | |
2069 | ||
2070 | /* Now try to get class */ | |
2071 | if (clid == 0) { | |
15e47304 | 2072 | if (portid == TC_H_ROOT) |
1da177e4 LT |
2073 | clid = qid; |
2074 | } else | |
2075 | clid = TC_H_MAKE(qid, clid); | |
2076 | ||
2077 | if (clid) | |
143976ce | 2078 | cl = cops->find(q, clid); |
1da177e4 LT |
2079 | |
2080 | if (cl == 0) { | |
2081 | err = -ENOENT; | |
cc7ec456 ED |
2082 | if (n->nlmsg_type != RTM_NEWTCLASS || |
2083 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
2084 | goto out; |
2085 | } else { | |
2086 | switch (n->nlmsg_type) { | |
10297b99 | 2087 | case RTM_NEWTCLASS: |
1da177e4 | 2088 | err = -EEXIST; |
cc7ec456 | 2089 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
2090 | goto out; |
2091 | break; | |
2092 | case RTM_DELTCLASS: | |
4dd78a73 | 2093 | err = tclass_del_notify(net, cops, skb, n, q, cl, extack); |
07d79fc7 CW |
2094 | /* Unbind the class with flilters with 0 */ |
2095 | tc_bind_tclass(q, portid, clid, 0); | |
1da177e4 LT |
2096 | goto out; |
2097 | case RTM_GETTCLASS: | |
7316ae88 | 2098 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
2099 | goto out; |
2100 | default: | |
2101 | err = -EINVAL; | |
2102 | goto out; | |
2103 | } | |
2104 | } | |
2105 | ||
d47a6b0e JP |
2106 | if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) { |
2107 | NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes"); | |
2108 | return -EOPNOTSUPP; | |
2109 | } | |
2110 | ||
1da177e4 | 2111 | new_cl = cl; |
de6d5cdf PM |
2112 | err = -EOPNOTSUPP; |
2113 | if (cops->change) | |
793d81d6 | 2114 | err = cops->change(q, clid, portid, tca, &new_cl, extack); |
07d79fc7 | 2115 | if (err == 0) { |
7316ae88 | 2116 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
07d79fc7 CW |
2117 | /* We just create a new class, need to do reverse binding. */ |
2118 | if (cl != new_cl) | |
2119 | tc_bind_tclass(q, portid, clid, new_cl); | |
2120 | } | |
1da177e4 | 2121 | out: |
1da177e4 LT |
2122 | return err; |
2123 | } | |
2124 | ||
cc7ec456 ED |
2125 | struct qdisc_dump_args { |
2126 | struct qdisc_walker w; | |
2127 | struct sk_buff *skb; | |
2128 | struct netlink_callback *cb; | |
1da177e4 LT |
2129 | }; |
2130 | ||
5a7a5555 JHS |
2131 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, |
2132 | struct qdisc_walker *arg) | |
1da177e4 LT |
2133 | { |
2134 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
2135 | ||
15e47304 | 2136 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
2137 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
2138 | RTM_NEWTCLASS); | |
1da177e4 LT |
2139 | } |
2140 | ||
30723673 DM |
2141 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
2142 | struct tcmsg *tcm, struct netlink_callback *cb, | |
2143 | int *t_p, int s_t) | |
2144 | { | |
2145 | struct qdisc_dump_args arg; | |
2146 | ||
49b49971 | 2147 | if (tc_qdisc_dump_ignore(q, false) || |
30723673 DM |
2148 | *t_p < s_t || !q->ops->cl_ops || |
2149 | (tcm->tcm_parent && | |
2150 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
2151 | (*t_p)++; | |
2152 | return 0; | |
2153 | } | |
2154 | if (*t_p > s_t) | |
2155 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
2156 | arg.w.fn = qdisc_class_dump; | |
2157 | arg.skb = skb; | |
2158 | arg.cb = cb; | |
2159 | arg.w.stop = 0; | |
2160 | arg.w.skip = cb->args[1]; | |
2161 | arg.w.count = 0; | |
2162 | q->ops->cl_ops->walk(q, &arg.w); | |
2163 | cb->args[1] = arg.w.count; | |
2164 | if (arg.w.stop) | |
2165 | return -1; | |
2166 | (*t_p)++; | |
2167 | return 0; | |
2168 | } | |
2169 | ||
2170 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
2171 | struct tcmsg *tcm, struct netlink_callback *cb, | |
bfc25605 | 2172 | int *t_p, int s_t, bool recur) |
30723673 DM |
2173 | { |
2174 | struct Qdisc *q; | |
59cc1f61 | 2175 | int b; |
30723673 DM |
2176 | |
2177 | if (!root) | |
2178 | return 0; | |
2179 | ||
2180 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
2181 | return -1; | |
2182 | ||
bfc25605 | 2183 | if (!qdisc_dev(root) || !recur) |
69012ae4 JK |
2184 | return 0; |
2185 | ||
cb395b20 ED |
2186 | if (tcm->tcm_parent) { |
2187 | q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent)); | |
3c53ed8f PS |
2188 | if (q && q != root && |
2189 | tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
cb395b20 ED |
2190 | return -1; |
2191 | return 0; | |
2192 | } | |
59cc1f61 | 2193 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
2194 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
2195 | return -1; | |
2196 | } | |
2197 | ||
2198 | return 0; | |
2199 | } | |
2200 | ||
1da177e4 LT |
2201 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
2202 | { | |
02ef22ca | 2203 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 2204 | struct net *net = sock_net(skb->sk); |
30723673 | 2205 | struct netdev_queue *dev_queue; |
1da177e4 | 2206 | struct net_device *dev; |
30723673 | 2207 | int t, s_t; |
1da177e4 | 2208 | |
573ce260 | 2209 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 2210 | return 0; |
cc7ec456 ED |
2211 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
2212 | if (!dev) | |
1da177e4 LT |
2213 | return 0; |
2214 | ||
2215 | s_t = cb->args[0]; | |
2216 | t = 0; | |
2217 | ||
5891cd5e ED |
2218 | if (tc_dump_tclass_root(rtnl_dereference(dev->qdisc), |
2219 | skb, tcm, cb, &t, s_t, true) < 0) | |
30723673 DM |
2220 | goto done; |
2221 | ||
24824a09 ED |
2222 | dev_queue = dev_ingress_queue(dev); |
2223 | if (dev_queue && | |
2224 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
bfc25605 | 2225 | &t, s_t, false) < 0) |
30723673 | 2226 | goto done; |
1da177e4 | 2227 | |
30723673 | 2228 | done: |
1da177e4 LT |
2229 | cb->args[0] = t; |
2230 | ||
2231 | dev_put(dev); | |
2232 | return skb->len; | |
2233 | } | |
2234 | ||
1da177e4 LT |
2235 | #ifdef CONFIG_PROC_FS |
2236 | static int psched_show(struct seq_file *seq, void *v) | |
2237 | { | |
2238 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 2239 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 2240 | 1000000, |
1e317688 | 2241 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
2242 | |
2243 | return 0; | |
2244 | } | |
2245 | ||
7316ae88 TG |
2246 | static int __net_init psched_net_init(struct net *net) |
2247 | { | |
2248 | struct proc_dir_entry *e; | |
2249 | ||
3f3942ac | 2250 | e = proc_create_single("psched", 0, net->proc_net, psched_show); |
7316ae88 TG |
2251 | if (e == NULL) |
2252 | return -ENOMEM; | |
2253 | ||
2254 | return 0; | |
2255 | } | |
2256 | ||
2257 | static void __net_exit psched_net_exit(struct net *net) | |
2258 | { | |
ece31ffd | 2259 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
2260 | } |
2261 | #else | |
2262 | static int __net_init psched_net_init(struct net *net) | |
2263 | { | |
2264 | return 0; | |
2265 | } | |
2266 | ||
2267 | static void __net_exit psched_net_exit(struct net *net) | |
2268 | { | |
2269 | } | |
1da177e4 LT |
2270 | #endif |
2271 | ||
7316ae88 TG |
2272 | static struct pernet_operations psched_net_ops = { |
2273 | .init = psched_net_init, | |
2274 | .exit = psched_net_exit, | |
2275 | }; | |
2276 | ||
7f0e8102 PT |
2277 | DEFINE_STATIC_KEY_FALSE(tc_skip_wrapper); |
2278 | ||
1da177e4 LT |
2279 | static int __init pktsched_init(void) |
2280 | { | |
7316ae88 TG |
2281 | int err; |
2282 | ||
2283 | err = register_pernet_subsys(&psched_net_ops); | |
2284 | if (err) { | |
cc7ec456 | 2285 | pr_err("pktsched_init: " |
7316ae88 TG |
2286 | "cannot initialize per netns operations\n"); |
2287 | return err; | |
2288 | } | |
2289 | ||
6da7c8fc | 2290 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
2291 | register_qdisc(&pfifo_qdisc_ops); |
2292 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 2293 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 2294 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 2295 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 2296 | |
b97bac64 FW |
2297 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0); |
2298 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0); | |
5a7a5555 | 2299 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, |
b97bac64 FW |
2300 | 0); |
2301 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0); | |
2302 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0); | |
5a7a5555 | 2303 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, |
b97bac64 | 2304 | 0); |
be577ddc | 2305 | |
7f0e8102 PT |
2306 | tc_wrapper_init(); |
2307 | ||
1da177e4 LT |
2308 | return 0; |
2309 | } | |
2310 | ||
2311 | subsys_initcall(pktsched_init); |