]>
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( | |
d636fc5d | 312 | rtnl_dereference(dev_ingress_queue(dev)->qdisc_sleeping), |
24824a09 | 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) | |
d636fc5d ED |
331 | q = qdisc_match_from_root(rcu_dereference(nq->qdisc_sleeping), |
332 | handle); | |
3a7d0d07 VB |
333 | out: |
334 | return q; | |
335 | } | |
336 | ||
1da177e4 LT |
337 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) |
338 | { | |
339 | unsigned long cl; | |
20fea08b | 340 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
341 | |
342 | if (cops == NULL) | |
343 | return NULL; | |
143976ce | 344 | cl = cops->find(p, classid); |
1da177e4 LT |
345 | |
346 | if (cl == 0) | |
347 | return NULL; | |
2561f972 | 348 | return cops->leaf(p, cl); |
1da177e4 LT |
349 | } |
350 | ||
351 | /* Find queueing discipline by name */ | |
352 | ||
1e90474c | 353 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
354 | { |
355 | struct Qdisc_ops *q = NULL; | |
356 | ||
357 | if (kind) { | |
358 | read_lock(&qdisc_mod_lock); | |
359 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 360 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
361 | if (!try_module_get(q->owner)) |
362 | q = NULL; | |
363 | break; | |
364 | } | |
365 | } | |
366 | read_unlock(&qdisc_mod_lock); | |
367 | } | |
368 | return q; | |
369 | } | |
370 | ||
8a8e3d84 JDB |
371 | /* The linklayer setting were not transferred from iproute2, in older |
372 | * versions, and the rate tables lookup systems have been dropped in | |
373 | * the kernel. To keep backward compatible with older iproute2 tc | |
374 | * utils, we detect the linklayer setting by detecting if the rate | |
375 | * table were modified. | |
376 | * | |
377 | * For linklayer ATM table entries, the rate table will be aligned to | |
378 | * 48 bytes, thus some table entries will contain the same value. The | |
379 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
380 | * starting from the mpu, we find low and high table entries for | |
381 | * mapping this cell. If these entries contain the same value, when | |
382 | * the rate tables have been modified for linklayer ATM. | |
383 | * | |
384 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
385 | * and then roundup to the next cell, calc the table entry one below, | |
386 | * and compare. | |
387 | */ | |
388 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
389 | { | |
390 | int low = roundup(r->mpu, 48); | |
391 | int high = roundup(low+1, 48); | |
392 | int cell_low = low >> r->cell_log; | |
393 | int cell_high = (high >> r->cell_log) - 1; | |
394 | ||
395 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
396 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
397 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
398 | return TC_LINKLAYER_ETHERNET; | |
399 | } | |
400 | ||
401 | if ((cell_high > cell_low) && (cell_high < 256) | |
402 | && (rtab[cell_low] == rtab[cell_high])) { | |
403 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
404 | cell_low, cell_high, rtab[cell_high]); | |
405 | return TC_LINKLAYER_ATM; | |
406 | } | |
407 | return TC_LINKLAYER_ETHERNET; | |
408 | } | |
409 | ||
1da177e4 LT |
410 | static struct qdisc_rate_table *qdisc_rtab_list; |
411 | ||
5a7a5555 | 412 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
e9bc3fa2 AA |
413 | struct nlattr *tab, |
414 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
415 | { |
416 | struct qdisc_rate_table *rtab; | |
417 | ||
e4bedf48 ED |
418 | if (tab == NULL || r->rate == 0 || |
419 | r->cell_log == 0 || r->cell_log >= 32 || | |
e9bc3fa2 AA |
420 | nla_len(tab) != TC_RTAB_SIZE) { |
421 | NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching"); | |
40edeff6 | 422 | return NULL; |
e9bc3fa2 | 423 | } |
40edeff6 | 424 | |
1da177e4 | 425 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
426 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
427 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
428 | rtab->refcnt++; |
429 | return rtab; | |
430 | } | |
431 | } | |
432 | ||
1da177e4 LT |
433 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
434 | if (rtab) { | |
435 | rtab->rate = *r; | |
436 | rtab->refcnt = 1; | |
1e90474c | 437 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
438 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
439 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
440 | rtab->next = qdisc_rtab_list; |
441 | qdisc_rtab_list = rtab; | |
e9bc3fa2 AA |
442 | } else { |
443 | NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table"); | |
1da177e4 LT |
444 | } |
445 | return rtab; | |
446 | } | |
62e3ba1b | 447 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
448 | |
449 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
450 | { | |
451 | struct qdisc_rate_table *rtab, **rtabp; | |
452 | ||
453 | if (!tab || --tab->refcnt) | |
454 | return; | |
455 | ||
cc7ec456 ED |
456 | for (rtabp = &qdisc_rtab_list; |
457 | (rtab = *rtabp) != NULL; | |
458 | rtabp = &rtab->next) { | |
1da177e4 LT |
459 | if (rtab == tab) { |
460 | *rtabp = rtab->next; | |
461 | kfree(rtab); | |
462 | return; | |
463 | } | |
464 | } | |
465 | } | |
62e3ba1b | 466 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 467 | |
175f9c1b | 468 | static LIST_HEAD(qdisc_stab_list); |
175f9c1b JK |
469 | |
470 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
471 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
472 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
473 | }; | |
474 | ||
09215598 AA |
475 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt, |
476 | struct netlink_ext_ack *extack) | |
175f9c1b JK |
477 | { |
478 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
479 | struct qdisc_size_table *stab; | |
480 | struct tc_sizespec *s; | |
481 | unsigned int tsize = 0; | |
482 | u16 *tab = NULL; | |
483 | int err; | |
484 | ||
8cb08174 JB |
485 | err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy, |
486 | extack); | |
175f9c1b JK |
487 | if (err < 0) |
488 | return ERR_PTR(err); | |
09215598 AA |
489 | if (!tb[TCA_STAB_BASE]) { |
490 | NL_SET_ERR_MSG(extack, "Size table base attribute is missing"); | |
175f9c1b | 491 | return ERR_PTR(-EINVAL); |
09215598 | 492 | } |
175f9c1b JK |
493 | |
494 | s = nla_data(tb[TCA_STAB_BASE]); | |
495 | ||
496 | if (s->tsize > 0) { | |
09215598 AA |
497 | if (!tb[TCA_STAB_DATA]) { |
498 | NL_SET_ERR_MSG(extack, "Size table data attribute is missing"); | |
175f9c1b | 499 | return ERR_PTR(-EINVAL); |
09215598 | 500 | } |
175f9c1b JK |
501 | tab = nla_data(tb[TCA_STAB_DATA]); |
502 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
503 | } | |
504 | ||
09215598 AA |
505 | if (tsize != s->tsize || (!tab && tsize > 0)) { |
506 | NL_SET_ERR_MSG(extack, "Invalid size of size table"); | |
175f9c1b | 507 | return ERR_PTR(-EINVAL); |
09215598 | 508 | } |
175f9c1b | 509 | |
175f9c1b JK |
510 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
511 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
512 | continue; | |
69508d43 GS |
513 | if (tsize > 0 && |
514 | memcmp(stab->data, tab, flex_array_size(stab, data, tsize))) | |
175f9c1b JK |
515 | continue; |
516 | stab->refcnt++; | |
175f9c1b JK |
517 | return stab; |
518 | } | |
519 | ||
b193e15a | 520 | if (s->size_log > STAB_SIZE_LOG_MAX || |
521 | s->cell_log > STAB_SIZE_LOG_MAX) { | |
522 | NL_SET_ERR_MSG(extack, "Invalid logarithmic size of size table"); | |
523 | return ERR_PTR(-EINVAL); | |
524 | } | |
525 | ||
69508d43 | 526 | stab = kmalloc(struct_size(stab, data, tsize), GFP_KERNEL); |
175f9c1b JK |
527 | if (!stab) |
528 | return ERR_PTR(-ENOMEM); | |
529 | ||
530 | stab->refcnt = 1; | |
531 | stab->szopts = *s; | |
532 | if (tsize > 0) | |
69508d43 | 533 | memcpy(stab->data, tab, flex_array_size(stab, data, tsize)); |
175f9c1b | 534 | |
175f9c1b | 535 | list_add_tail(&stab->list, &qdisc_stab_list); |
175f9c1b JK |
536 | |
537 | return stab; | |
538 | } | |
539 | ||
540 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
541 | { | |
542 | if (!tab) | |
543 | return; | |
544 | ||
175f9c1b JK |
545 | if (--tab->refcnt == 0) { |
546 | list_del(&tab->list); | |
6e07902f | 547 | kfree_rcu(tab, rcu); |
175f9c1b | 548 | } |
175f9c1b JK |
549 | } |
550 | EXPORT_SYMBOL(qdisc_put_stab); | |
551 | ||
552 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
553 | { | |
554 | struct nlattr *nest; | |
555 | ||
ae0be8de | 556 | nest = nla_nest_start_noflag(skb, TCA_STAB); |
3aa4614d PM |
557 | if (nest == NULL) |
558 | goto nla_put_failure; | |
1b34ec43 DM |
559 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
560 | goto nla_put_failure; | |
175f9c1b JK |
561 | nla_nest_end(skb, nest); |
562 | ||
563 | return skb->len; | |
564 | ||
565 | nla_put_failure: | |
566 | return -1; | |
567 | } | |
568 | ||
5a7a5555 JHS |
569 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
570 | const struct qdisc_size_table *stab) | |
175f9c1b JK |
571 | { |
572 | int pkt_len, slot; | |
573 | ||
574 | pkt_len = skb->len + stab->szopts.overhead; | |
575 | if (unlikely(!stab->szopts.tsize)) | |
576 | goto out; | |
577 | ||
578 | slot = pkt_len + stab->szopts.cell_align; | |
579 | if (unlikely(slot < 0)) | |
580 | slot = 0; | |
581 | ||
582 | slot >>= stab->szopts.cell_log; | |
583 | if (likely(slot < stab->szopts.tsize)) | |
584 | pkt_len = stab->data[slot]; | |
585 | else | |
586 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
587 | (slot / stab->szopts.tsize) + | |
588 | stab->data[slot % stab->szopts.tsize]; | |
589 | ||
590 | pkt_len <<= stab->szopts.size_log; | |
591 | out: | |
592 | if (unlikely(pkt_len < 1)) | |
593 | pkt_len = 1; | |
594 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
595 | } | |
a2da570d | 596 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 597 | |
6e765a00 | 598 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
599 | { |
600 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
601 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
602 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
603 | qdisc->flags |= TCQ_F_WARN_NONWC; |
604 | } | |
605 | } | |
606 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
607 | ||
4179477f PM |
608 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
609 | { | |
610 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 611 | timer); |
4179477f | 612 | |
1e203c1a | 613 | rcu_read_lock(); |
8608db03 | 614 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 615 | rcu_read_unlock(); |
1936502d | 616 | |
4179477f PM |
617 | return HRTIMER_NORESTART; |
618 | } | |
619 | ||
860b642b VCG |
620 | void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc, |
621 | clockid_t clockid) | |
4179477f | 622 | { |
860b642b | 623 | hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 624 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
625 | wd->qdisc = qdisc; |
626 | } | |
860b642b VCG |
627 | EXPORT_SYMBOL(qdisc_watchdog_init_clockid); |
628 | ||
629 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
630 | { | |
631 | qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC); | |
632 | } | |
4179477f PM |
633 | EXPORT_SYMBOL(qdisc_watchdog_init); |
634 | ||
efe074c2 ED |
635 | void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires, |
636 | u64 delta_ns) | |
4179477f | 637 | { |
d636fc5d ED |
638 | bool deactivated; |
639 | ||
640 | rcu_read_lock(); | |
641 | deactivated = test_bit(__QDISC_STATE_DEACTIVATED, | |
642 | &qdisc_root_sleeping(wd->qdisc)->state); | |
643 | rcu_read_unlock(); | |
644 | if (deactivated) | |
2540e051 JP |
645 | return; |
646 | ||
b88948fb | 647 | if (hrtimer_is_queued(&wd->timer)) { |
62423bd2 ED |
648 | u64 softexpires; |
649 | ||
650 | softexpires = ktime_to_ns(hrtimer_get_softexpires(&wd->timer)); | |
b88948fb ED |
651 | /* If timer is already set in [expires, expires + delta_ns], |
652 | * do not reprogram it. | |
653 | */ | |
62423bd2 | 654 | if (softexpires - expires <= delta_ns) |
b88948fb ED |
655 | return; |
656 | } | |
a9efad8b | 657 | |
efe074c2 ED |
658 | hrtimer_start_range_ns(&wd->timer, |
659 | ns_to_ktime(expires), | |
660 | delta_ns, | |
661 | HRTIMER_MODE_ABS_PINNED); | |
4179477f | 662 | } |
efe074c2 | 663 | EXPORT_SYMBOL(qdisc_watchdog_schedule_range_ns); |
4179477f PM |
664 | |
665 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
666 | { | |
2fbd3da3 | 667 | hrtimer_cancel(&wd->timer); |
4179477f PM |
668 | } |
669 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 670 | |
a94f779f | 671 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 | 672 | { |
6fe1c7a5 | 673 | struct hlist_head *h; |
9695fe6f | 674 | unsigned int i; |
6fe1c7a5 | 675 | |
9695fe6f | 676 | h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL); |
6fe1c7a5 PM |
677 | |
678 | if (h != NULL) { | |
679 | for (i = 0; i < n; i++) | |
680 | INIT_HLIST_HEAD(&h[i]); | |
681 | } | |
682 | return h; | |
683 | } | |
684 | ||
6fe1c7a5 PM |
685 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) |
686 | { | |
687 | struct Qdisc_class_common *cl; | |
b67bfe0d | 688 | struct hlist_node *next; |
6fe1c7a5 PM |
689 | struct hlist_head *nhash, *ohash; |
690 | unsigned int nsize, nmask, osize; | |
691 | unsigned int i, h; | |
692 | ||
693 | /* Rehash when load factor exceeds 0.75 */ | |
694 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
695 | return; | |
696 | nsize = clhash->hashsize * 2; | |
697 | nmask = nsize - 1; | |
698 | nhash = qdisc_class_hash_alloc(nsize); | |
699 | if (nhash == NULL) | |
700 | return; | |
701 | ||
702 | ohash = clhash->hash; | |
703 | osize = clhash->hashsize; | |
704 | ||
705 | sch_tree_lock(sch); | |
706 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 707 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
708 | h = qdisc_class_hash(cl->classid, nmask); |
709 | hlist_add_head(&cl->hnode, &nhash[h]); | |
710 | } | |
711 | } | |
712 | clhash->hash = nhash; | |
713 | clhash->hashsize = nsize; | |
714 | clhash->hashmask = nmask; | |
715 | sch_tree_unlock(sch); | |
716 | ||
9695fe6f | 717 | kvfree(ohash); |
6fe1c7a5 PM |
718 | } |
719 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
720 | ||
721 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
722 | { | |
723 | unsigned int size = 4; | |
724 | ||
725 | clhash->hash = qdisc_class_hash_alloc(size); | |
ac8ef4ab | 726 | if (!clhash->hash) |
6fe1c7a5 PM |
727 | return -ENOMEM; |
728 | clhash->hashsize = size; | |
729 | clhash->hashmask = size - 1; | |
730 | clhash->hashelems = 0; | |
731 | return 0; | |
732 | } | |
733 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
734 | ||
735 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
736 | { | |
9695fe6f | 737 | kvfree(clhash->hash); |
6fe1c7a5 PM |
738 | } |
739 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
740 | ||
741 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
742 | struct Qdisc_class_common *cl) | |
743 | { | |
744 | unsigned int h; | |
745 | ||
746 | INIT_HLIST_NODE(&cl->hnode); | |
747 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
748 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
749 | clhash->hashelems++; | |
750 | } | |
751 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
752 | ||
753 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
754 | struct Qdisc_class_common *cl) | |
755 | { | |
756 | hlist_del(&cl->hnode); | |
757 | clhash->hashelems--; | |
758 | } | |
759 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
760 | ||
fa0f5aa7 ED |
761 | /* Allocate an unique handle from space managed by kernel |
762 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
763 | */ | |
1da177e4 LT |
764 | static u32 qdisc_alloc_handle(struct net_device *dev) |
765 | { | |
fa0f5aa7 | 766 | int i = 0x8000; |
1da177e4 LT |
767 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
768 | ||
769 | do { | |
770 | autohandle += TC_H_MAKE(0x10000U, 0); | |
771 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
772 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
773 | if (!qdisc_lookup(dev, autohandle)) |
774 | return autohandle; | |
775 | cond_resched(); | |
776 | } while (--i > 0); | |
1da177e4 | 777 | |
fa0f5aa7 | 778 | return 0; |
1da177e4 LT |
779 | } |
780 | ||
5f2939d9 | 781 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len) |
43effa1e | 782 | { |
fd5ac14a | 783 | bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED; |
20fea08b | 784 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
785 | unsigned long cl; |
786 | u32 parentid; | |
95946658 | 787 | bool notify; |
2c8c8e6f | 788 | int drops; |
43effa1e | 789 | |
2ccccf5f | 790 | if (n == 0 && len == 0) |
43effa1e | 791 | return; |
2c8c8e6f | 792 | drops = max_t(int, n, 0); |
4eaf3b84 | 793 | rcu_read_lock(); |
43effa1e | 794 | while ((parentid = sch->parent)) { |
066a3b5b | 795 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 796 | break; |
066a3b5b | 797 | |
4eaf3b84 ED |
798 | if (sch->flags & TCQ_F_NOPARENT) |
799 | break; | |
95946658 KK |
800 | /* Notify parent qdisc only if child qdisc becomes empty. |
801 | * | |
802 | * If child was empty even before update then backlog | |
803 | * counter is screwed and we skip notification because | |
804 | * parent class is already passive. | |
fd5ac14a NF |
805 | * |
806 | * If the original child was offloaded then it is allowed | |
807 | * to be seem as empty, so the parent is notified anyway. | |
95946658 | 808 | */ |
fd5ac14a NF |
809 | notify = !sch->q.qlen && !WARN_ON_ONCE(!n && |
810 | !qdisc_is_offloaded); | |
4eaf3b84 | 811 | /* TODO: perform the search on a per txq basis */ |
5ce2d488 | 812 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 813 | if (sch == NULL) { |
4eaf3b84 ED |
814 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
815 | break; | |
ffc8fefa | 816 | } |
43effa1e | 817 | cops = sch->ops->cl_ops; |
95946658 | 818 | if (notify && cops->qlen_notify) { |
143976ce | 819 | cl = cops->find(sch, parentid); |
43effa1e | 820 | cops->qlen_notify(sch, cl); |
43effa1e PM |
821 | } |
822 | sch->q.qlen -= n; | |
2ccccf5f | 823 | sch->qstats.backlog -= len; |
25331d6c | 824 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 825 | } |
4eaf3b84 | 826 | rcu_read_unlock(); |
43effa1e | 827 | } |
2ccccf5f | 828 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
1da177e4 | 829 | |
b592843c JK |
830 | int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type, |
831 | void *type_data) | |
832 | { | |
833 | struct net_device *dev = qdisc_dev(sch); | |
834 | int err; | |
835 | ||
836 | sch->flags &= ~TCQ_F_OFFLOADED; | |
837 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
838 | return 0; | |
839 | ||
840 | err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data); | |
841 | if (err == -EOPNOTSUPP) | |
842 | return 0; | |
843 | ||
844 | if (!err) | |
845 | sch->flags |= TCQ_F_OFFLOADED; | |
846 | ||
847 | return err; | |
848 | } | |
849 | EXPORT_SYMBOL(qdisc_offload_dump_helper); | |
850 | ||
bfaee911 JK |
851 | void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
852 | struct Qdisc *new, struct Qdisc *old, | |
853 | enum tc_setup_type type, void *type_data, | |
854 | struct netlink_ext_ack *extack) | |
855 | { | |
856 | bool any_qdisc_is_offloaded; | |
857 | int err; | |
858 | ||
859 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
860 | return; | |
861 | ||
862 | err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data); | |
863 | ||
864 | /* Don't report error if the graft is part of destroy operation. */ | |
865 | if (!err || !new || new == &noop_qdisc) | |
866 | return; | |
867 | ||
868 | /* Don't report error if the parent, the old child and the new | |
869 | * one are not offloaded. | |
870 | */ | |
871 | any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED; | |
872 | any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED; | |
873 | any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED; | |
874 | ||
875 | if (any_qdisc_is_offloaded) | |
876 | NL_SET_ERR_MSG(extack, "Offloading graft operation failed."); | |
877 | } | |
878 | EXPORT_SYMBOL(qdisc_offload_graft_helper); | |
879 | ||
aac4daa8 VO |
880 | void qdisc_offload_query_caps(struct net_device *dev, |
881 | enum tc_setup_type type, | |
882 | void *caps, size_t caps_len) | |
883 | { | |
884 | const struct net_device_ops *ops = dev->netdev_ops; | |
885 | struct tc_query_caps_base base = { | |
886 | .type = type, | |
887 | .caps = caps, | |
888 | }; | |
889 | ||
890 | memset(caps, 0, caps_len); | |
891 | ||
892 | if (ops->ndo_setup_tc) | |
893 | ops->ndo_setup_tc(dev, TC_QUERY_CAPS, &base); | |
894 | } | |
895 | EXPORT_SYMBOL(qdisc_offload_query_caps); | |
896 | ||
98b0e5f6 JK |
897 | static void qdisc_offload_graft_root(struct net_device *dev, |
898 | struct Qdisc *new, struct Qdisc *old, | |
899 | struct netlink_ext_ack *extack) | |
900 | { | |
901 | struct tc_root_qopt_offload graft_offload = { | |
902 | .command = TC_ROOT_GRAFT, | |
903 | .handle = new ? new->handle : 0, | |
904 | .ingress = (new && new->flags & TCQ_F_INGRESS) || | |
905 | (old && old->flags & TCQ_F_INGRESS), | |
906 | }; | |
907 | ||
908 | qdisc_offload_graft_helper(dev, NULL, new, old, | |
909 | TC_SETUP_ROOT_QDISC, &graft_offload, extack); | |
910 | } | |
911 | ||
27d7f07c | 912 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, |
0349b877 HL |
913 | u32 portid, u32 seq, u16 flags, int event, |
914 | struct netlink_ext_ack *extack) | |
27d7f07c | 915 | { |
50dc9a85 | 916 | struct gnet_stats_basic_sync __percpu *cpu_bstats = NULL; |
27d7f07c WC |
917 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; |
918 | struct tcmsg *tcm; | |
919 | struct nlmsghdr *nlh; | |
920 | unsigned char *b = skb_tail_pointer(skb); | |
921 | struct gnet_dump d; | |
922 | struct qdisc_size_table *stab; | |
d47a6b0e | 923 | u32 block_index; |
27d7f07c WC |
924 | __u32 qlen; |
925 | ||
926 | cond_resched(); | |
927 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
928 | if (!nlh) | |
929 | goto out_nlmsg_trim; | |
930 | tcm = nlmsg_data(nlh); | |
931 | tcm->tcm_family = AF_UNSPEC; | |
932 | tcm->tcm__pad1 = 0; | |
933 | tcm->tcm__pad2 = 0; | |
934 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
935 | tcm->tcm_parent = clid; | |
936 | tcm->tcm_handle = q->handle; | |
937 | tcm->tcm_info = refcount_read(&q->refcnt); | |
938 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
939 | goto nla_put_failure; | |
d47a6b0e JP |
940 | if (q->ops->ingress_block_get) { |
941 | block_index = q->ops->ingress_block_get(q); | |
942 | if (block_index && | |
943 | nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index)) | |
944 | goto nla_put_failure; | |
945 | } | |
946 | if (q->ops->egress_block_get) { | |
947 | block_index = q->ops->egress_block_get(q); | |
948 | if (block_index && | |
949 | nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index)) | |
950 | goto nla_put_failure; | |
951 | } | |
27d7f07c WC |
952 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
953 | goto nla_put_failure; | |
44edf2f8 NF |
954 | if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED))) |
955 | goto nla_put_failure; | |
7e66016f | 956 | qlen = qdisc_qlen_sum(q); |
27d7f07c WC |
957 | |
958 | stab = rtnl_dereference(q->stab); | |
959 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
960 | goto nla_put_failure; | |
961 | ||
962 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
963 | NULL, &d, TCA_PAD) < 0) | |
964 | goto nla_put_failure; | |
965 | ||
966 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
967 | goto nla_put_failure; | |
968 | ||
969 | if (qdisc_is_percpu_stats(q)) { | |
970 | cpu_bstats = q->cpu_bstats; | |
971 | cpu_qstats = q->cpu_qstats; | |
972 | } | |
973 | ||
29cbcd85 | 974 | if (gnet_stats_copy_basic(&d, cpu_bstats, &q->bstats, true) < 0 || |
27d7f07c WC |
975 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
976 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) | |
977 | goto nla_put_failure; | |
978 | ||
979 | if (gnet_stats_finish_copy(&d) < 0) | |
980 | goto nla_put_failure; | |
981 | ||
0349b877 HL |
982 | if (extack && extack->_msg && |
983 | nla_put_string(skb, TCA_EXT_WARN_MSG, extack->_msg)) | |
984 | goto out_nlmsg_trim; | |
985 | ||
27d7f07c | 986 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
0349b877 | 987 | |
27d7f07c WC |
988 | return skb->len; |
989 | ||
990 | out_nlmsg_trim: | |
991 | nla_put_failure: | |
992 | nlmsg_trim(skb, b); | |
993 | return -1; | |
994 | } | |
995 | ||
996 | static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible) | |
997 | { | |
998 | if (q->flags & TCQ_F_BUILTIN) | |
999 | return true; | |
1000 | if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible) | |
1001 | return true; | |
1002 | ||
1003 | return false; | |
1004 | } | |
1005 | ||
1006 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, | |
1007 | struct nlmsghdr *n, u32 clid, | |
0349b877 HL |
1008 | struct Qdisc *old, struct Qdisc *new, |
1009 | struct netlink_ext_ack *extack) | |
27d7f07c WC |
1010 | { |
1011 | struct sk_buff *skb; | |
1012 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1013 | ||
1014 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1015 | if (!skb) | |
1016 | return -ENOBUFS; | |
1017 | ||
1018 | if (old && !tc_qdisc_dump_ignore(old, false)) { | |
1019 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, | |
0349b877 | 1020 | 0, RTM_DELQDISC, extack) < 0) |
27d7f07c WC |
1021 | goto err_out; |
1022 | } | |
1023 | if (new && !tc_qdisc_dump_ignore(new, false)) { | |
1024 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, | |
0349b877 | 1025 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC, extack) < 0) |
27d7f07c WC |
1026 | goto err_out; |
1027 | } | |
1028 | ||
1029 | if (skb->len) | |
1030 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1031 | n->nlmsg_flags & NLM_F_ECHO); | |
1032 | ||
1033 | err_out: | |
1034 | kfree_skb(skb); | |
1035 | return -EINVAL; | |
1036 | } | |
1037 | ||
7316ae88 TG |
1038 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
1039 | struct nlmsghdr *n, u32 clid, | |
0349b877 HL |
1040 | struct Qdisc *old, struct Qdisc *new, |
1041 | struct netlink_ext_ack *extack) | |
99194cff DM |
1042 | { |
1043 | if (new || old) | |
0349b877 | 1044 | qdisc_notify(net, skb, n, clid, old, new, extack); |
1da177e4 | 1045 | |
4d8863a2 | 1046 | if (old) |
86bd446b | 1047 | qdisc_put(old); |
99194cff DM |
1048 | } |
1049 | ||
8a53e616 PA |
1050 | static void qdisc_clear_nolock(struct Qdisc *sch) |
1051 | { | |
1052 | sch->flags &= ~TCQ_F_NOLOCK; | |
1053 | if (!(sch->flags & TCQ_F_CPUSTATS)) | |
1054 | return; | |
1055 | ||
1056 | free_percpu(sch->cpu_bstats); | |
1057 | free_percpu(sch->cpu_qstats); | |
1058 | sch->cpu_bstats = NULL; | |
1059 | sch->cpu_qstats = NULL; | |
1060 | sch->flags &= ~TCQ_F_CPUSTATS; | |
1061 | } | |
1062 | ||
99194cff DM |
1063 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or |
1064 | * to device "dev". | |
1065 | * | |
1066 | * When appropriate send a netlink notification using 'skb' | |
1067 | * and "n". | |
1068 | * | |
1069 | * On success, destroy old qdisc. | |
1da177e4 LT |
1070 | */ |
1071 | ||
1072 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff | 1073 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
09215598 AA |
1074 | struct Qdisc *new, struct Qdisc *old, |
1075 | struct netlink_ext_ack *extack) | |
1da177e4 | 1076 | { |
99194cff | 1077 | struct Qdisc *q = old; |
7316ae88 | 1078 | struct net *net = dev_net(dev); |
1da177e4 | 1079 | |
10297b99 | 1080 | if (parent == NULL) { |
99194cff | 1081 | unsigned int i, num_q, ingress; |
2d5f6a8d | 1082 | struct netdev_queue *dev_queue; |
99194cff DM |
1083 | |
1084 | ingress = 0; | |
1085 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
1086 | if ((q && q->flags & TCQ_F_INGRESS) || |
1087 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff | 1088 | ingress = 1; |
84ad0af0 PY |
1089 | dev_queue = dev_ingress_queue(dev); |
1090 | if (!dev_queue) { | |
09215598 | 1091 | NL_SET_ERR_MSG(extack, "Device does not have an ingress queue"); |
24824a09 | 1092 | return -ENOENT; |
09215598 | 1093 | } |
84ad0af0 PY |
1094 | |
1095 | q = rtnl_dereference(dev_queue->qdisc_sleeping); | |
1096 | ||
1097 | /* This is the counterpart of that qdisc_refcount_inc_nz() call in | |
1098 | * __tcf_qdisc_find() for filter requests. | |
1099 | */ | |
1100 | if (!qdisc_refcount_dec_if_one(q)) { | |
1101 | NL_SET_ERR_MSG(extack, | |
1102 | "Current ingress or clsact Qdisc has ongoing filter requests"); | |
1103 | return -EBUSY; | |
1104 | } | |
99194cff DM |
1105 | } |
1106 | ||
1107 | if (dev->flags & IFF_UP) | |
1108 | dev_deactivate(dev); | |
1109 | ||
98b0e5f6 JK |
1110 | qdisc_offload_graft_root(dev, new, old, extack); |
1111 | ||
de2d807b | 1112 | if (new && new->ops->attach && !ingress) |
86e363dc | 1113 | goto skip; |
6ec1c69a | 1114 | |
2d5f6a8d PY |
1115 | if (!ingress) { |
1116 | for (i = 0; i < num_q; i++) { | |
99194cff | 1117 | dev_queue = netdev_get_tx_queue(dev, i); |
2d5f6a8d | 1118 | old = dev_graft_qdisc(dev_queue, new); |
99194cff | 1119 | |
2d5f6a8d PY |
1120 | if (new && i > 0) |
1121 | qdisc_refcount_inc(new); | |
86bd446b | 1122 | qdisc_put(old); |
2d5f6a8d PY |
1123 | } |
1124 | } else { | |
84ad0af0 PY |
1125 | old = dev_graft_qdisc(dev_queue, NULL); |
1126 | ||
1127 | /* {ingress,clsact}_destroy() @old before grafting @new to avoid | |
1128 | * unprotected concurrent accesses to net_device::miniq_{in,e}gress | |
1129 | * pointer(s) in mini_qdisc_pair_swap(). | |
1130 | */ | |
1131 | qdisc_notify(net, skb, n, classid, old, new, extack); | |
1132 | qdisc_destroy(old); | |
1133 | ||
1134 | dev_graft_qdisc(dev_queue, new); | |
1da177e4 | 1135 | } |
99194cff | 1136 | |
86e363dc | 1137 | skip: |
036d6a67 | 1138 | if (!ingress) { |
ebda44da | 1139 | old = rtnl_dereference(dev->qdisc); |
036d6a67 | 1140 | if (new && !new->ops->attach) |
551143d8 | 1141 | qdisc_refcount_inc(new); |
5891cd5e | 1142 | rcu_assign_pointer(dev->qdisc, new ? : &noop_qdisc); |
86e363dc | 1143 | |
0349b877 | 1144 | notify_and_destroy(net, skb, n, classid, old, new, extack); |
ebda44da | 1145 | |
86e363dc WC |
1146 | if (new && new->ops->attach) |
1147 | new->ops->attach(new); | |
036d6a67 | 1148 | } |
af356afa | 1149 | |
99194cff DM |
1150 | if (dev->flags & IFF_UP) |
1151 | dev_activate(dev); | |
1da177e4 | 1152 | } else { |
20fea08b | 1153 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
9da93ece JK |
1154 | unsigned long cl; |
1155 | int err; | |
1da177e4 | 1156 | |
c5ad119f | 1157 | /* Only support running class lockless if parent is lockless */ |
8eaf8d99 | 1158 | if (new && (new->flags & TCQ_F_NOLOCK) && !(parent->flags & TCQ_F_NOLOCK)) |
8a53e616 | 1159 | qdisc_clear_nolock(new); |
c5ad119f | 1160 | |
9da93ece JK |
1161 | if (!cops || !cops->graft) |
1162 | return -EOPNOTSUPP; | |
143976ce | 1163 | |
9da93ece JK |
1164 | cl = cops->find(parent, classid); |
1165 | if (!cl) { | |
1166 | NL_SET_ERR_MSG(extack, "Specified class not found"); | |
1167 | return -ENOENT; | |
1da177e4 | 1168 | } |
9da93ece | 1169 | |
96398560 FL |
1170 | if (new && new->ops == &noqueue_qdisc_ops) { |
1171 | NL_SET_ERR_MSG(extack, "Cannot assign noqueue to a class"); | |
1172 | return -EINVAL; | |
1173 | } | |
1174 | ||
9da93ece JK |
1175 | err = cops->graft(parent, cl, new, &old, extack); |
1176 | if (err) | |
1177 | return err; | |
0349b877 | 1178 | notify_and_destroy(net, skb, n, classid, old, new, extack); |
1da177e4 | 1179 | } |
9da93ece | 1180 | return 0; |
1da177e4 LT |
1181 | } |
1182 | ||
d47a6b0e JP |
1183 | static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca, |
1184 | struct netlink_ext_ack *extack) | |
1185 | { | |
1186 | u32 block_index; | |
1187 | ||
1188 | if (tca[TCA_INGRESS_BLOCK]) { | |
1189 | block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]); | |
1190 | ||
1191 | if (!block_index) { | |
1192 | NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0"); | |
1193 | return -EINVAL; | |
1194 | } | |
1195 | if (!sch->ops->ingress_block_set) { | |
1196 | NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported"); | |
1197 | return -EOPNOTSUPP; | |
1198 | } | |
1199 | sch->ops->ingress_block_set(sch, block_index); | |
1200 | } | |
1201 | if (tca[TCA_EGRESS_BLOCK]) { | |
1202 | block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]); | |
1203 | ||
1204 | if (!block_index) { | |
1205 | NL_SET_ERR_MSG(extack, "Egress block index cannot be 0"); | |
1206 | return -EINVAL; | |
1207 | } | |
1208 | if (!sch->ops->egress_block_set) { | |
1209 | NL_SET_ERR_MSG(extack, "Egress block sharing is not supported"); | |
1210 | return -EOPNOTSUPP; | |
1211 | } | |
1212 | sch->ops->egress_block_set(sch, block_index); | |
1213 | } | |
1214 | return 0; | |
1215 | } | |
1216 | ||
1da177e4 LT |
1217 | /* |
1218 | Allocate and initialize new qdisc. | |
1219 | ||
1220 | Parameters are passed via opt. | |
1221 | */ | |
1222 | ||
5a7a5555 JHS |
1223 | static struct Qdisc *qdisc_create(struct net_device *dev, |
1224 | struct netdev_queue *dev_queue, | |
cfc111d5 | 1225 | u32 parent, u32 handle, |
09215598 AA |
1226 | struct nlattr **tca, int *errp, |
1227 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1228 | { |
1229 | int err; | |
1e90474c | 1230 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
1231 | struct Qdisc *sch; |
1232 | struct Qdisc_ops *ops; | |
175f9c1b | 1233 | struct qdisc_size_table *stab; |
1da177e4 LT |
1234 | |
1235 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 1236 | #ifdef CONFIG_MODULES |
1da177e4 LT |
1237 | if (ops == NULL && kind != NULL) { |
1238 | char name[IFNAMSIZ]; | |
872f6903 | 1239 | if (nla_strscpy(name, kind, IFNAMSIZ) >= 0) { |
1da177e4 LT |
1240 | /* We dropped the RTNL semaphore in order to |
1241 | * perform the module load. So, even if we | |
1242 | * succeeded in loading the module we have to | |
1243 | * tell the caller to replay the request. We | |
1244 | * indicate this using -EAGAIN. | |
1245 | * We replay the request because the device may | |
1246 | * go away in the mean time. | |
1247 | */ | |
1248 | rtnl_unlock(); | |
1249 | request_module("sch_%s", name); | |
1250 | rtnl_lock(); | |
1251 | ops = qdisc_lookup_ops(kind); | |
1252 | if (ops != NULL) { | |
1253 | /* We will try again qdisc_lookup_ops, | |
1254 | * so don't keep a reference. | |
1255 | */ | |
1256 | module_put(ops->owner); | |
1257 | err = -EAGAIN; | |
1258 | goto err_out; | |
1259 | } | |
1260 | } | |
1261 | } | |
1262 | #endif | |
1263 | ||
b9e2cc0f | 1264 | err = -ENOENT; |
09215598 | 1265 | if (!ops) { |
973bf8fd | 1266 | NL_SET_ERR_MSG(extack, "Specified qdisc kind is unknown"); |
1da177e4 | 1267 | goto err_out; |
09215598 | 1268 | } |
1da177e4 | 1269 | |
d0bd684d | 1270 | sch = qdisc_alloc(dev_queue, ops, extack); |
3d54b82f TG |
1271 | if (IS_ERR(sch)) { |
1272 | err = PTR_ERR(sch); | |
1da177e4 | 1273 | goto err_out2; |
3d54b82f | 1274 | } |
1da177e4 | 1275 | |
ffc8fefa PM |
1276 | sch->parent = parent; |
1277 | ||
3d54b82f | 1278 | if (handle == TC_H_INGRESS) { |
f85fa45d PY |
1279 | if (!(sch->flags & TCQ_F_INGRESS)) { |
1280 | NL_SET_ERR_MSG(extack, | |
1281 | "Specified parent ID is reserved for ingress and clsact Qdiscs"); | |
1282 | err = -EINVAL; | |
1283 | goto err_out3; | |
1284 | } | |
3d54b82f | 1285 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
fd44de7c | 1286 | } else { |
fd44de7c PM |
1287 | if (handle == 0) { |
1288 | handle = qdisc_alloc_handle(dev); | |
aaeb1dea IV |
1289 | if (handle == 0) { |
1290 | NL_SET_ERR_MSG(extack, "Maximum number of qdisc handles was exceeded"); | |
1291 | err = -ENOSPC; | |
fd44de7c | 1292 | goto err_out3; |
aaeb1dea | 1293 | } |
fd44de7c | 1294 | } |
1abbe139 | 1295 | if (!netif_is_multiqueue(dev)) |
225734de | 1296 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
1297 | } |
1298 | ||
3d54b82f | 1299 | sch->handle = handle; |
1da177e4 | 1300 | |
84c46dd8 JDB |
1301 | /* This exist to keep backward compatible with a userspace |
1302 | * loophole, what allowed userspace to get IFF_NO_QUEUE | |
1303 | * facility on older kernels by setting tx_queue_len=0 (prior | |
1304 | * to qdisc init), and then forgot to reinit tx_queue_len | |
1305 | * before again attaching a qdisc. | |
1306 | */ | |
1307 | if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { | |
1308 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; | |
1309 | netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); | |
1310 | } | |
1311 | ||
d47a6b0e JP |
1312 | err = qdisc_block_indexes_set(sch, tca, extack); |
1313 | if (err) | |
1314 | goto err_out3; | |
1315 | ||
54160ef6 | 1316 | if (tca[TCA_STAB]) { |
09215598 | 1317 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
54160ef6 AA |
1318 | if (IS_ERR(stab)) { |
1319 | err = PTR_ERR(stab); | |
4fab6412 | 1320 | goto err_out3; |
023e09a7 | 1321 | } |
54160ef6 AA |
1322 | rcu_assign_pointer(sch->stab, stab); |
1323 | } | |
1f62879e VO |
1324 | |
1325 | if (ops->init) { | |
1326 | err = ops->init(sch, tca[TCA_OPTIONS], extack); | |
1327 | if (err != 0) | |
4fab6412 | 1328 | goto err_out4; |
1f62879e VO |
1329 | } |
1330 | ||
54160ef6 | 1331 | if (tca[TCA_RATE]) { |
54160ef6 | 1332 | err = -EOPNOTSUPP; |
09215598 AA |
1333 | if (sch->flags & TCQ_F_MQROOT) { |
1334 | NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc"); | |
4fab6412 | 1335 | goto err_out4; |
09215598 | 1336 | } |
1da177e4 | 1337 | |
54160ef6 AA |
1338 | err = gen_new_estimator(&sch->bstats, |
1339 | sch->cpu_bstats, | |
1340 | &sch->rate_est, | |
1341 | NULL, | |
29cbcd85 | 1342 | true, |
54160ef6 | 1343 | tca[TCA_RATE]); |
09215598 AA |
1344 | if (err) { |
1345 | NL_SET_ERR_MSG(extack, "Failed to generate new estimator"); | |
4fab6412 | 1346 | goto err_out4; |
09215598 | 1347 | } |
1da177e4 | 1348 | } |
54160ef6 AA |
1349 | |
1350 | qdisc_hash_add(sch, false); | |
f5a7833e | 1351 | trace_qdisc_create(ops, dev, parent); |
54160ef6 AA |
1352 | |
1353 | return sch; | |
1354 | ||
1f62879e | 1355 | err_out4: |
4fab6412 ED |
1356 | /* Even if ops->init() failed, we call ops->destroy() |
1357 | * like qdisc_create_dflt(). | |
1358 | */ | |
c1a4872e GF |
1359 | if (ops->destroy) |
1360 | ops->destroy(sch); | |
4fab6412 | 1361 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
1da177e4 | 1362 | err_out3: |
d62607c3 | 1363 | netdev_put(dev, &sch->dev_tracker); |
81d947e2 | 1364 | qdisc_free(sch); |
1da177e4 LT |
1365 | err_out2: |
1366 | module_put(ops->owner); | |
1367 | err_out: | |
1368 | *errp = err; | |
1da177e4 LT |
1369 | return NULL; |
1370 | } | |
1371 | ||
09215598 AA |
1372 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca, |
1373 | struct netlink_ext_ack *extack) | |
1da177e4 | 1374 | { |
a2da570d | 1375 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1376 | int err = 0; |
1da177e4 | 1377 | |
175f9c1b | 1378 | if (tca[TCA_OPTIONS]) { |
09215598 AA |
1379 | if (!sch->ops->change) { |
1380 | NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc"); | |
1da177e4 | 1381 | return -EINVAL; |
09215598 | 1382 | } |
d47a6b0e JP |
1383 | if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) { |
1384 | NL_SET_ERR_MSG(extack, "Change of blocks is not supported"); | |
1385 | return -EOPNOTSUPP; | |
1386 | } | |
2030721c | 1387 | err = sch->ops->change(sch, tca[TCA_OPTIONS], extack); |
1da177e4 LT |
1388 | if (err) |
1389 | return err; | |
1390 | } | |
175f9c1b JK |
1391 | |
1392 | if (tca[TCA_STAB]) { | |
09215598 | 1393 | stab = qdisc_get_stab(tca[TCA_STAB], extack); |
175f9c1b JK |
1394 | if (IS_ERR(stab)) |
1395 | return PTR_ERR(stab); | |
1396 | } | |
1397 | ||
a2da570d ED |
1398 | ostab = rtnl_dereference(sch->stab); |
1399 | rcu_assign_pointer(sch->stab, stab); | |
1400 | qdisc_put_stab(ostab); | |
175f9c1b | 1401 | |
23bcf634 | 1402 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1403 | /* NB: ignores errors from replace_estimator |
1404 | because change can't be undone. */ | |
23bcf634 PM |
1405 | if (sch->flags & TCQ_F_MQROOT) |
1406 | goto out; | |
22e0f8b9 JF |
1407 | gen_replace_estimator(&sch->bstats, |
1408 | sch->cpu_bstats, | |
1409 | &sch->rate_est, | |
edb09eb1 | 1410 | NULL, |
29cbcd85 | 1411 | true, |
22e0f8b9 | 1412 | tca[TCA_RATE]); |
23bcf634 PM |
1413 | } |
1414 | out: | |
1da177e4 LT |
1415 | return 0; |
1416 | } | |
1417 | ||
cc7ec456 ED |
1418 | struct check_loop_arg { |
1419 | struct qdisc_walker w; | |
1da177e4 LT |
1420 | struct Qdisc *p; |
1421 | int depth; | |
1422 | }; | |
1423 | ||
5a7a5555 JHS |
1424 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, |
1425 | struct qdisc_walker *w); | |
1da177e4 LT |
1426 | |
1427 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1428 | { | |
1429 | struct check_loop_arg arg; | |
1430 | ||
1431 | if (q->ops->cl_ops == NULL) | |
1432 | return 0; | |
1433 | ||
1434 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1435 | arg.w.fn = check_loop_fn; | |
1436 | arg.depth = depth; | |
1437 | arg.p = p; | |
1438 | q->ops->cl_ops->walk(q, &arg.w); | |
1439 | return arg.w.stop ? -ELOOP : 0; | |
1440 | } | |
1441 | ||
1442 | static int | |
1443 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1444 | { | |
1445 | struct Qdisc *leaf; | |
20fea08b | 1446 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1447 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1448 | ||
1449 | leaf = cops->leaf(q, cl); | |
1450 | if (leaf) { | |
1451 | if (leaf == arg->p || arg->depth > 7) | |
1452 | return -ELOOP; | |
1453 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1454 | } | |
1455 | return 0; | |
1456 | } | |
1457 | ||
8b4c3cdd | 1458 | const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = { |
6f96c3c6 | 1459 | [TCA_KIND] = { .type = NLA_STRING }, |
8b4c3cdd DA |
1460 | [TCA_RATE] = { .type = NLA_BINARY, |
1461 | .len = sizeof(struct tc_estimator) }, | |
1462 | [TCA_STAB] = { .type = NLA_NESTED }, | |
1463 | [TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG }, | |
1464 | [TCA_CHAIN] = { .type = NLA_U32 }, | |
1465 | [TCA_INGRESS_BLOCK] = { .type = NLA_U32 }, | |
1466 | [TCA_EGRESS_BLOCK] = { .type = NLA_U32 }, | |
1467 | }; | |
1468 | ||
e331473f DC |
1469 | /* |
1470 | * Delete/get qdisc. | |
1471 | */ | |
1472 | ||
c21ef3e3 DA |
1473 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1474 | struct netlink_ext_ack *extack) | |
1da177e4 | 1475 | { |
3b1e0a65 | 1476 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1477 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1478 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1479 | struct net_device *dev; |
de179c8c | 1480 | u32 clid; |
1da177e4 LT |
1481 | struct Qdisc *q = NULL; |
1482 | struct Qdisc *p = NULL; | |
1483 | int err; | |
1484 | ||
8cb08174 JB |
1485 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1486 | rtm_tca_policy, extack); | |
1e90474c PM |
1487 | if (err < 0) |
1488 | return err; | |
1489 | ||
de179c8c H |
1490 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1491 | if (!dev) | |
1492 | return -ENODEV; | |
1493 | ||
1494 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1495 | if (clid) { |
1496 | if (clid != TC_H_ROOT) { | |
1497 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 | 1498 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1499 | if (!p) { |
1500 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid"); | |
1da177e4 | 1501 | return -ENOENT; |
09215598 | 1502 | } |
1da177e4 | 1503 | q = qdisc_leaf(p, clid); |
cc7ec456 | 1504 | } else if (dev_ingress_queue(dev)) { |
d636fc5d | 1505 | q = rtnl_dereference(dev_ingress_queue(dev)->qdisc_sleeping); |
10297b99 | 1506 | } |
1da177e4 | 1507 | } else { |
5891cd5e | 1508 | q = rtnl_dereference(dev->qdisc); |
1da177e4 | 1509 | } |
09215598 AA |
1510 | if (!q) { |
1511 | NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device"); | |
1da177e4 | 1512 | return -ENOENT; |
09215598 | 1513 | } |
1da177e4 | 1514 | |
09215598 AA |
1515 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) { |
1516 | NL_SET_ERR_MSG(extack, "Invalid handle"); | |
1da177e4 | 1517 | return -EINVAL; |
09215598 | 1518 | } |
1da177e4 | 1519 | } else { |
cc7ec456 | 1520 | q = qdisc_lookup(dev, tcm->tcm_handle); |
09215598 AA |
1521 | if (!q) { |
1522 | NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle"); | |
1da177e4 | 1523 | return -ENOENT; |
09215598 | 1524 | } |
1da177e4 LT |
1525 | } |
1526 | ||
09215598 AA |
1527 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1528 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1529 | return -EINVAL; |
09215598 | 1530 | } |
1da177e4 LT |
1531 | |
1532 | if (n->nlmsg_type == RTM_DELQDISC) { | |
09215598 AA |
1533 | if (!clid) { |
1534 | NL_SET_ERR_MSG(extack, "Classid cannot be zero"); | |
1da177e4 | 1535 | return -EINVAL; |
09215598 AA |
1536 | } |
1537 | if (q->handle == 0) { | |
1538 | NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero"); | |
1da177e4 | 1539 | return -ENOENT; |
09215598 AA |
1540 | } |
1541 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack); | |
cc7ec456 | 1542 | if (err != 0) |
1da177e4 | 1543 | return err; |
1da177e4 | 1544 | } else { |
0349b877 | 1545 | qdisc_notify(net, skb, n, clid, NULL, q, NULL); |
1da177e4 LT |
1546 | } |
1547 | return 0; | |
1548 | } | |
1549 | ||
da71714e JHS |
1550 | static bool req_create_or_replace(struct nlmsghdr *n) |
1551 | { | |
1552 | return (n->nlmsg_flags & NLM_F_CREATE && | |
1553 | n->nlmsg_flags & NLM_F_REPLACE); | |
1554 | } | |
1555 | ||
1556 | static bool req_create_exclusive(struct nlmsghdr *n) | |
1557 | { | |
1558 | return (n->nlmsg_flags & NLM_F_CREATE && | |
1559 | n->nlmsg_flags & NLM_F_EXCL); | |
1560 | } | |
1561 | ||
1562 | static bool req_change(struct nlmsghdr *n) | |
1563 | { | |
1564 | return (!(n->nlmsg_flags & NLM_F_CREATE) && | |
1565 | !(n->nlmsg_flags & NLM_F_REPLACE) && | |
1566 | !(n->nlmsg_flags & NLM_F_EXCL)); | |
1567 | } | |
1568 | ||
1da177e4 | 1569 | /* |
cc7ec456 | 1570 | * Create/change qdisc. |
1da177e4 | 1571 | */ |
c21ef3e3 DA |
1572 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, |
1573 | struct netlink_ext_ack *extack) | |
1da177e4 | 1574 | { |
3b1e0a65 | 1575 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1576 | struct tcmsg *tcm; |
1e90474c | 1577 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1578 | struct net_device *dev; |
1579 | u32 clid; | |
1580 | struct Qdisc *q, *p; | |
1581 | int err; | |
1582 | ||
1583 | replay: | |
1584 | /* Reinit, just in case something touches this. */ | |
8cb08174 JB |
1585 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
1586 | rtm_tca_policy, extack); | |
de179c8c H |
1587 | if (err < 0) |
1588 | return err; | |
1589 | ||
02ef22ca | 1590 | tcm = nlmsg_data(n); |
1da177e4 LT |
1591 | clid = tcm->tcm_parent; |
1592 | q = p = NULL; | |
1593 | ||
cc7ec456 ED |
1594 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1595 | if (!dev) | |
1da177e4 LT |
1596 | return -ENODEV; |
1597 | ||
1e90474c | 1598 | |
1da177e4 LT |
1599 | if (clid) { |
1600 | if (clid != TC_H_ROOT) { | |
1601 | if (clid != TC_H_INGRESS) { | |
cc7ec456 | 1602 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
09215598 AA |
1603 | if (!p) { |
1604 | NL_SET_ERR_MSG(extack, "Failed to find specified qdisc"); | |
1da177e4 | 1605 | return -ENOENT; |
09215598 | 1606 | } |
1da177e4 | 1607 | q = qdisc_leaf(p, clid); |
cc7ec456 | 1608 | } else if (dev_ingress_queue_create(dev)) { |
d636fc5d | 1609 | q = rtnl_dereference(dev_ingress_queue(dev)->qdisc_sleeping); |
1da177e4 LT |
1610 | } |
1611 | } else { | |
5891cd5e | 1612 | q = rtnl_dereference(dev->qdisc); |
1da177e4 LT |
1613 | } |
1614 | ||
1615 | /* It may be default qdisc, ignore it */ | |
1616 | if (q && q->handle == 0) | |
1617 | q = NULL; | |
1618 | ||
1619 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1620 | if (tcm->tcm_handle) { | |
09215598 AA |
1621 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) { |
1622 | NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override"); | |
1da177e4 | 1623 | return -EEXIST; |
09215598 AA |
1624 | } |
1625 | if (TC_H_MIN(tcm->tcm_handle)) { | |
1626 | NL_SET_ERR_MSG(extack, "Invalid minor handle"); | |
1da177e4 | 1627 | return -EINVAL; |
09215598 | 1628 | } |
cc7ec456 | 1629 | q = qdisc_lookup(dev, tcm->tcm_handle); |
8ec69574 | 1630 | if (!q) |
1da177e4 | 1631 | goto create_n_graft; |
09215598 AA |
1632 | if (n->nlmsg_flags & NLM_F_EXCL) { |
1633 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override"); | |
1da177e4 | 1634 | return -EEXIST; |
09215598 | 1635 | } |
0ac4bd68 | 1636 | if (tca[TCA_KIND] && |
09215598 AA |
1637 | nla_strcmp(tca[TCA_KIND], q->ops->id)) { |
1638 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1639 | return -EINVAL; |
09215598 | 1640 | } |
9de95df5 PY |
1641 | if (q->flags & TCQ_F_INGRESS) { |
1642 | NL_SET_ERR_MSG(extack, | |
1643 | "Cannot regraft ingress or clsact Qdiscs"); | |
1644 | return -EINVAL; | |
1645 | } | |
1da177e4 | 1646 | if (q == p || |
09215598 AA |
1647 | (p && check_loop(q, p, 0))) { |
1648 | NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected"); | |
1da177e4 | 1649 | return -ELOOP; |
09215598 | 1650 | } |
36eec020 ZS |
1651 | if (clid == TC_H_INGRESS) { |
1652 | NL_SET_ERR_MSG(extack, "Ingress cannot graft directly"); | |
1653 | return -EINVAL; | |
1654 | } | |
551143d8 | 1655 | qdisc_refcount_inc(q); |
1da177e4 LT |
1656 | goto graft; |
1657 | } else { | |
cc7ec456 | 1658 | if (!q) |
1da177e4 LT |
1659 | goto create_n_graft; |
1660 | ||
1661 | /* This magic test requires explanation. | |
1662 | * | |
1663 | * We know, that some child q is already | |
1664 | * attached to this parent and have choice: | |
da71714e JHS |
1665 | * 1) change it or 2) create/graft new one. |
1666 | * If the requested qdisc kind is different | |
1667 | * than the existing one, then we choose graft. | |
1668 | * If they are the same then this is "change" | |
1669 | * operation - just let it fallthrough.. | |
1da177e4 LT |
1670 | * |
1671 | * 1. We are allowed to create/graft only | |
da71714e JHS |
1672 | * if the request is explicitly stating |
1673 | * "please create if it doesn't exist". | |
1da177e4 | 1674 | * |
da71714e JHS |
1675 | * 2. If the request is to exclusive create |
1676 | * then the qdisc tcm_handle is not expected | |
1da177e4 LT |
1677 | * to exist, so that we choose create/graft too. |
1678 | * | |
1679 | * 3. The last case is when no flags are set. | |
da71714e JHS |
1680 | * This will happen when for example tc |
1681 | * utility issues a "change" command. | |
1da177e4 LT |
1682 | * Alas, it is sort of hole in API, we |
1683 | * cannot decide what to do unambiguously. | |
da71714e | 1684 | * For now we select create/graft. |
1da177e4 | 1685 | */ |
da71714e JHS |
1686 | if (tca[TCA_KIND] && |
1687 | nla_strcmp(tca[TCA_KIND], q->ops->id)) { | |
1688 | if (req_create_or_replace(n) || | |
1689 | req_create_exclusive(n)) | |
1690 | goto create_n_graft; | |
1691 | else if (req_change(n)) | |
1692 | goto create_n_graft2; | |
1693 | } | |
1da177e4 LT |
1694 | } |
1695 | } | |
1696 | } else { | |
09215598 AA |
1697 | if (!tcm->tcm_handle) { |
1698 | NL_SET_ERR_MSG(extack, "Handle cannot be zero"); | |
1da177e4 | 1699 | return -EINVAL; |
09215598 | 1700 | } |
1da177e4 LT |
1701 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1702 | } | |
1703 | ||
1704 | /* Change qdisc parameters */ | |
09215598 AA |
1705 | if (!q) { |
1706 | NL_SET_ERR_MSG(extack, "Specified qdisc not found"); | |
1da177e4 | 1707 | return -ENOENT; |
09215598 AA |
1708 | } |
1709 | if (n->nlmsg_flags & NLM_F_EXCL) { | |
1710 | NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify"); | |
1da177e4 | 1711 | return -EEXIST; |
09215598 AA |
1712 | } |
1713 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { | |
1714 | NL_SET_ERR_MSG(extack, "Invalid qdisc name"); | |
1da177e4 | 1715 | return -EINVAL; |
09215598 AA |
1716 | } |
1717 | err = qdisc_change(q, tca, extack); | |
1da177e4 | 1718 | if (err == 0) |
0349b877 | 1719 | qdisc_notify(net, skb, n, clid, NULL, q, extack); |
1da177e4 LT |
1720 | return err; |
1721 | ||
1722 | create_n_graft: | |
09215598 AA |
1723 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { |
1724 | NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag"); | |
1da177e4 | 1725 | return -ENOENT; |
09215598 | 1726 | } |
da71714e | 1727 | create_n_graft2: |
24824a09 | 1728 | if (clid == TC_H_INGRESS) { |
09215598 | 1729 | if (dev_ingress_queue(dev)) { |
cfc111d5 | 1730 | q = qdisc_create(dev, dev_ingress_queue(dev), |
24824a09 | 1731 | tcm->tcm_parent, tcm->tcm_parent, |
09215598 AA |
1732 | tca, &err, extack); |
1733 | } else { | |
1734 | NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device"); | |
24824a09 | 1735 | err = -ENOENT; |
09215598 | 1736 | } |
24824a09 | 1737 | } else { |
926e61b7 | 1738 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1739 | |
1740 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1741 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1742 | else if (p) | |
1743 | dev_queue = p->dev_queue; | |
1744 | else | |
1745 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1746 | |
cfc111d5 | 1747 | q = qdisc_create(dev, dev_queue, |
bb949fbd | 1748 | tcm->tcm_parent, tcm->tcm_handle, |
09215598 | 1749 | tca, &err, extack); |
6ec1c69a | 1750 | } |
1da177e4 LT |
1751 | if (q == NULL) { |
1752 | if (err == -EAGAIN) | |
1753 | goto replay; | |
1754 | return err; | |
1755 | } | |
1756 | ||
1757 | graft: | |
09215598 | 1758 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack); |
e5befbd9 IJ |
1759 | if (err) { |
1760 | if (q) | |
86bd446b | 1761 | qdisc_put(q); |
e5befbd9 | 1762 | return err; |
1da177e4 | 1763 | } |
e5befbd9 | 1764 | |
1da177e4 LT |
1765 | return 0; |
1766 | } | |
1767 | ||
30723673 DM |
1768 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1769 | struct netlink_callback *cb, | |
49b49971 JK |
1770 | int *q_idx_p, int s_q_idx, bool recur, |
1771 | bool dump_invisible) | |
30723673 DM |
1772 | { |
1773 | int ret = 0, q_idx = *q_idx_p; | |
1774 | struct Qdisc *q; | |
59cc1f61 | 1775 | int b; |
30723673 DM |
1776 | |
1777 | if (!root) | |
1778 | return 0; | |
1779 | ||
1780 | q = root; | |
1781 | if (q_idx < s_q_idx) { | |
1782 | q_idx++; | |
1783 | } else { | |
49b49971 | 1784 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1785 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 | 1786 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
0349b877 | 1787 | RTM_NEWQDISC, NULL) <= 0) |
30723673 DM |
1788 | goto done; |
1789 | q_idx++; | |
1790 | } | |
69012ae4 | 1791 | |
ea327469 JK |
1792 | /* If dumping singletons, there is no qdisc_dev(root) and the singleton |
1793 | * itself has already been dumped. | |
1794 | * | |
1795 | * If we've already dumped the top-level (ingress) qdisc above and the global | |
1796 | * qdisc hashtable, we don't want to hit it again | |
1797 | */ | |
1798 | if (!qdisc_dev(root) || !recur) | |
69012ae4 JK |
1799 | goto out; |
1800 | ||
59cc1f61 | 1801 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1802 | if (q_idx < s_q_idx) { |
1803 | q_idx++; | |
1804 | continue; | |
1805 | } | |
49b49971 | 1806 | if (!tc_qdisc_dump_ignore(q, dump_invisible) && |
15e47304 | 1807 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 | 1808 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
0349b877 | 1809 | RTM_NEWQDISC, NULL) <= 0) |
30723673 DM |
1810 | goto done; |
1811 | q_idx++; | |
1812 | } | |
1813 | ||
1814 | out: | |
1815 | *q_idx_p = q_idx; | |
1816 | return ret; | |
1817 | done: | |
1818 | ret = -1; | |
1819 | goto out; | |
1820 | } | |
1821 | ||
1da177e4 LT |
1822 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1823 | { | |
3b1e0a65 | 1824 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1825 | int idx, q_idx; |
1826 | int s_idx, s_q_idx; | |
1827 | struct net_device *dev; | |
49b49971 | 1828 | const struct nlmsghdr *nlh = cb->nlh; |
49b49971 JK |
1829 | struct nlattr *tca[TCA_MAX + 1]; |
1830 | int err; | |
1da177e4 LT |
1831 | |
1832 | s_idx = cb->args[0]; | |
1833 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1834 | |
7562f876 | 1835 | idx = 0; |
15dc36eb | 1836 | ASSERT_RTNL(); |
49b49971 | 1837 | |
8cb08174 JB |
1838 | err = nlmsg_parse_deprecated(nlh, sizeof(struct tcmsg), tca, TCA_MAX, |
1839 | rtm_tca_policy, cb->extack); | |
49b49971 JK |
1840 | if (err < 0) |
1841 | return err; | |
1842 | ||
15dc36eb | 1843 | for_each_netdev(net, dev) { |
30723673 DM |
1844 | struct netdev_queue *dev_queue; |
1845 | ||
1da177e4 | 1846 | if (idx < s_idx) |
7562f876 | 1847 | goto cont; |
1da177e4 LT |
1848 | if (idx > s_idx) |
1849 | s_q_idx = 0; | |
1da177e4 | 1850 | q_idx = 0; |
30723673 | 1851 | |
5891cd5e ED |
1852 | if (tc_dump_qdisc_root(rtnl_dereference(dev->qdisc), |
1853 | skb, cb, &q_idx, s_q_idx, | |
49b49971 | 1854 | true, tca[TCA_DUMP_INVISIBLE]) < 0) |
30723673 DM |
1855 | goto done; |
1856 | ||
24824a09 ED |
1857 | dev_queue = dev_ingress_queue(dev); |
1858 | if (dev_queue && | |
d636fc5d ED |
1859 | tc_dump_qdisc_root(rtnl_dereference(dev_queue->qdisc_sleeping), |
1860 | skb, cb, &q_idx, s_q_idx, false, | |
49b49971 | 1861 | tca[TCA_DUMP_INVISIBLE]) < 0) |
30723673 DM |
1862 | goto done; |
1863 | ||
7562f876 PE |
1864 | cont: |
1865 | idx++; | |
1da177e4 LT |
1866 | } |
1867 | ||
1868 | done: | |
1da177e4 LT |
1869 | cb->args[0] = idx; |
1870 | cb->args[1] = q_idx; | |
1871 | ||
1872 | return skb->len; | |
1873 | } | |
1874 | ||
1875 | ||
1876 | ||
1877 | /************************************************ | |
1878 | * Traffic classes manipulation. * | |
1879 | ************************************************/ | |
1880 | ||
27d7f07c | 1881 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, |
0349b877 HL |
1882 | unsigned long cl, u32 portid, u32 seq, u16 flags, |
1883 | int event, struct netlink_ext_ack *extack) | |
27d7f07c WC |
1884 | { |
1885 | struct tcmsg *tcm; | |
1886 | struct nlmsghdr *nlh; | |
1887 | unsigned char *b = skb_tail_pointer(skb); | |
1888 | struct gnet_dump d; | |
1889 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; | |
1da177e4 | 1890 | |
27d7f07c WC |
1891 | cond_resched(); |
1892 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); | |
1893 | if (!nlh) | |
1894 | goto out_nlmsg_trim; | |
1895 | tcm = nlmsg_data(nlh); | |
1896 | tcm->tcm_family = AF_UNSPEC; | |
1897 | tcm->tcm__pad1 = 0; | |
1898 | tcm->tcm__pad2 = 0; | |
1899 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; | |
1900 | tcm->tcm_parent = q->handle; | |
1901 | tcm->tcm_handle = q->handle; | |
1902 | tcm->tcm_info = 0; | |
1903 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) | |
1904 | goto nla_put_failure; | |
1905 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) | |
1906 | goto nla_put_failure; | |
1907 | ||
1908 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, | |
1909 | NULL, &d, TCA_PAD) < 0) | |
1910 | goto nla_put_failure; | |
1911 | ||
1912 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1913 | goto nla_put_failure; | |
1914 | ||
1915 | if (gnet_stats_finish_copy(&d) < 0) | |
1916 | goto nla_put_failure; | |
1917 | ||
0349b877 HL |
1918 | if (extack && extack->_msg && |
1919 | nla_put_string(skb, TCA_EXT_WARN_MSG, extack->_msg)) | |
1920 | goto out_nlmsg_trim; | |
1921 | ||
27d7f07c | 1922 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
0349b877 | 1923 | |
27d7f07c WC |
1924 | return skb->len; |
1925 | ||
1926 | out_nlmsg_trim: | |
1927 | nla_put_failure: | |
1928 | nlmsg_trim(skb, b); | |
1929 | return -1; | |
1930 | } | |
1931 | ||
1932 | static int tclass_notify(struct net *net, struct sk_buff *oskb, | |
1933 | struct nlmsghdr *n, struct Qdisc *q, | |
0349b877 | 1934 | unsigned long cl, int event, struct netlink_ext_ack *extack) |
27d7f07c WC |
1935 | { |
1936 | struct sk_buff *skb; | |
1937 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1938 | ||
1939 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1940 | if (!skb) | |
1941 | return -ENOBUFS; | |
1942 | ||
0349b877 | 1943 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event, extack) < 0) { |
27d7f07c WC |
1944 | kfree_skb(skb); |
1945 | return -EINVAL; | |
1946 | } | |
1947 | ||
f79a3bcb YD |
1948 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1949 | n->nlmsg_flags & NLM_F_ECHO); | |
27d7f07c | 1950 | } |
1da177e4 | 1951 | |
14546ba1 WC |
1952 | static int tclass_del_notify(struct net *net, |
1953 | const struct Qdisc_class_ops *cops, | |
1954 | struct sk_buff *oskb, struct nlmsghdr *n, | |
4dd78a73 MM |
1955 | struct Qdisc *q, unsigned long cl, |
1956 | struct netlink_ext_ack *extack) | |
14546ba1 WC |
1957 | { |
1958 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; | |
1959 | struct sk_buff *skb; | |
1960 | int err = 0; | |
1961 | ||
1962 | if (!cops->delete) | |
1963 | return -EOPNOTSUPP; | |
1964 | ||
1965 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1966 | if (!skb) | |
1967 | return -ENOBUFS; | |
1968 | ||
1969 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, | |
0349b877 | 1970 | RTM_DELTCLASS, extack) < 0) { |
14546ba1 WC |
1971 | kfree_skb(skb); |
1972 | return -EINVAL; | |
1973 | } | |
1974 | ||
4dd78a73 | 1975 | err = cops->delete(q, cl, extack); |
14546ba1 WC |
1976 | if (err) { |
1977 | kfree_skb(skb); | |
1978 | return err; | |
1979 | } | |
1980 | ||
5b5f99b1 ZW |
1981 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1982 | n->nlmsg_flags & NLM_F_ECHO); | |
5b5f99b1 | 1983 | return err; |
14546ba1 WC |
1984 | } |
1985 | ||
07d79fc7 CW |
1986 | #ifdef CONFIG_NET_CLS |
1987 | ||
1988 | struct tcf_bind_args { | |
1989 | struct tcf_walker w; | |
2e24cd75 | 1990 | unsigned long base; |
07d79fc7 | 1991 | unsigned long cl; |
2e24cd75 | 1992 | u32 classid; |
07d79fc7 CW |
1993 | }; |
1994 | ||
1995 | static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg) | |
1996 | { | |
1997 | struct tcf_bind_args *a = (void *)arg; | |
1998 | ||
4e6263ec | 1999 | if (n && tp->ops->bind_class) { |
74e3be60 JP |
2000 | struct Qdisc *q = tcf_block_q(tp->chain->block); |
2001 | ||
2002 | sch_tree_lock(q); | |
2e24cd75 | 2003 | tp->ops->bind_class(n, a->classid, a->cl, q, a->base); |
74e3be60 | 2004 | sch_tree_unlock(q); |
07d79fc7 CW |
2005 | } |
2006 | return 0; | |
2007 | } | |
2008 | ||
760d228e CW |
2009 | struct tc_bind_class_args { |
2010 | struct qdisc_walker w; | |
2011 | unsigned long new_cl; | |
2012 | u32 portid; | |
2013 | u32 clid; | |
2014 | }; | |
2015 | ||
2016 | static int tc_bind_class_walker(struct Qdisc *q, unsigned long cl, | |
2017 | struct qdisc_walker *w) | |
07d79fc7 | 2018 | { |
760d228e | 2019 | struct tc_bind_class_args *a = (struct tc_bind_class_args *)w; |
07d79fc7 CW |
2020 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
2021 | struct tcf_block *block; | |
2022 | struct tcf_chain *chain; | |
07d79fc7 | 2023 | |
cbaacc4e | 2024 | block = cops->tcf_block(q, cl, NULL); |
07d79fc7 | 2025 | if (!block) |
760d228e | 2026 | return 0; |
bbf73830 VB |
2027 | for (chain = tcf_get_next_chain(block, NULL); |
2028 | chain; | |
2029 | chain = tcf_get_next_chain(block, chain)) { | |
07d79fc7 CW |
2030 | struct tcf_proto *tp; |
2031 | ||
0fca55ed VB |
2032 | for (tp = tcf_get_next_proto(chain, NULL); |
2033 | tp; tp = tcf_get_next_proto(chain, tp)) { | |
07d79fc7 CW |
2034 | struct tcf_bind_args arg = {}; |
2035 | ||
2036 | arg.w.fn = tcf_node_bind; | |
760d228e | 2037 | arg.classid = a->clid; |
2e24cd75 | 2038 | arg.base = cl; |
760d228e | 2039 | arg.cl = a->new_cl; |
12db03b6 | 2040 | tp->ops->walk(tp, &arg.w, true); |
07d79fc7 CW |
2041 | } |
2042 | } | |
760d228e CW |
2043 | |
2044 | return 0; | |
2045 | } | |
2046 | ||
2047 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
2048 | unsigned long new_cl) | |
2049 | { | |
2050 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; | |
2051 | struct tc_bind_class_args args = {}; | |
2052 | ||
2053 | if (!cops->tcf_block) | |
2054 | return; | |
2055 | args.portid = portid; | |
2056 | args.clid = clid; | |
2057 | args.new_cl = new_cl; | |
2058 | args.w.fn = tc_bind_class_walker; | |
2059 | q->ops->cl_ops->walk(q, &args.w); | |
07d79fc7 CW |
2060 | } |
2061 | ||
2062 | #else | |
2063 | ||
2064 | static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, | |
2065 | unsigned long new_cl) | |
2066 | { | |
2067 | } | |
2068 | ||
2069 | #endif | |
2070 | ||
c21ef3e3 DA |
2071 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, |
2072 | struct netlink_ext_ack *extack) | |
1da177e4 | 2073 | { |
3b1e0a65 | 2074 | struct net *net = sock_net(skb->sk); |
02ef22ca | 2075 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 2076 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
2077 | struct net_device *dev; |
2078 | struct Qdisc *q = NULL; | |
20fea08b | 2079 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
2080 | unsigned long cl = 0; |
2081 | unsigned long new_cl; | |
de179c8c H |
2082 | u32 portid; |
2083 | u32 clid; | |
2084 | u32 qid; | |
1da177e4 LT |
2085 | int err; |
2086 | ||
8cb08174 JB |
2087 | err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX, |
2088 | rtm_tca_policy, extack); | |
1e90474c PM |
2089 | if (err < 0) |
2090 | return err; | |
2091 | ||
de179c8c H |
2092 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
2093 | if (!dev) | |
2094 | return -ENODEV; | |
2095 | ||
1da177e4 LT |
2096 | /* |
2097 | parent == TC_H_UNSPEC - unspecified parent. | |
2098 | parent == TC_H_ROOT - class is root, which has no parent. | |
2099 | parent == X:0 - parent is root class. | |
2100 | parent == X:Y - parent is a node in hierarchy. | |
2101 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
2102 | ||
2103 | handle == 0:0 - generate handle from kernel pool. | |
2104 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
2105 | handle == X:Y - clear. | |
2106 | handle == X:0 - root class. | |
2107 | */ | |
2108 | ||
2109 | /* Step 1. Determine qdisc handle X:0 */ | |
2110 | ||
de179c8c H |
2111 | portid = tcm->tcm_parent; |
2112 | clid = tcm->tcm_handle; | |
2113 | qid = TC_H_MAJ(clid); | |
2114 | ||
15e47304 EB |
2115 | if (portid != TC_H_ROOT) { |
2116 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
2117 | |
2118 | if (qid && qid1) { | |
2119 | /* If both majors are known, they must be identical. */ | |
2120 | if (qid != qid1) | |
2121 | return -EINVAL; | |
2122 | } else if (qid1) { | |
2123 | qid = qid1; | |
2124 | } else if (qid == 0) | |
5891cd5e | 2125 | qid = rtnl_dereference(dev->qdisc)->handle; |
1da177e4 LT |
2126 | |
2127 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
2128 | * both with parent and child. |
2129 | * | |
15e47304 | 2130 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 2131 | */ |
15e47304 EB |
2132 | if (portid) |
2133 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
2134 | } else { |
2135 | if (qid == 0) | |
5891cd5e | 2136 | qid = rtnl_dereference(dev->qdisc)->handle; |
1da177e4 LT |
2137 | } |
2138 | ||
2139 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
2140 | q = qdisc_lookup(dev, qid); |
2141 | if (!q) | |
1da177e4 LT |
2142 | return -ENOENT; |
2143 | ||
2144 | /* An check that it supports classes */ | |
2145 | cops = q->ops->cl_ops; | |
2146 | if (cops == NULL) | |
2147 | return -EINVAL; | |
2148 | ||
2149 | /* Now try to get class */ | |
2150 | if (clid == 0) { | |
15e47304 | 2151 | if (portid == TC_H_ROOT) |
1da177e4 LT |
2152 | clid = qid; |
2153 | } else | |
2154 | clid = TC_H_MAKE(qid, clid); | |
2155 | ||
2156 | if (clid) | |
143976ce | 2157 | cl = cops->find(q, clid); |
1da177e4 LT |
2158 | |
2159 | if (cl == 0) { | |
2160 | err = -ENOENT; | |
cc7ec456 ED |
2161 | if (n->nlmsg_type != RTM_NEWTCLASS || |
2162 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
2163 | goto out; |
2164 | } else { | |
2165 | switch (n->nlmsg_type) { | |
10297b99 | 2166 | case RTM_NEWTCLASS: |
1da177e4 | 2167 | err = -EEXIST; |
cc7ec456 | 2168 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
2169 | goto out; |
2170 | break; | |
2171 | case RTM_DELTCLASS: | |
4dd78a73 | 2172 | err = tclass_del_notify(net, cops, skb, n, q, cl, extack); |
07d79fc7 CW |
2173 | /* Unbind the class with flilters with 0 */ |
2174 | tc_bind_tclass(q, portid, clid, 0); | |
1da177e4 LT |
2175 | goto out; |
2176 | case RTM_GETTCLASS: | |
0349b877 | 2177 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS, extack); |
1da177e4 LT |
2178 | goto out; |
2179 | default: | |
2180 | err = -EINVAL; | |
2181 | goto out; | |
2182 | } | |
2183 | } | |
2184 | ||
d47a6b0e JP |
2185 | if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) { |
2186 | NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes"); | |
2187 | return -EOPNOTSUPP; | |
2188 | } | |
2189 | ||
1da177e4 | 2190 | new_cl = cl; |
de6d5cdf PM |
2191 | err = -EOPNOTSUPP; |
2192 | if (cops->change) | |
793d81d6 | 2193 | err = cops->change(q, clid, portid, tca, &new_cl, extack); |
07d79fc7 | 2194 | if (err == 0) { |
0349b877 | 2195 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS, extack); |
07d79fc7 CW |
2196 | /* We just create a new class, need to do reverse binding. */ |
2197 | if (cl != new_cl) | |
2198 | tc_bind_tclass(q, portid, clid, new_cl); | |
2199 | } | |
1da177e4 | 2200 | out: |
1da177e4 LT |
2201 | return err; |
2202 | } | |
2203 | ||
cc7ec456 ED |
2204 | struct qdisc_dump_args { |
2205 | struct qdisc_walker w; | |
2206 | struct sk_buff *skb; | |
2207 | struct netlink_callback *cb; | |
1da177e4 LT |
2208 | }; |
2209 | ||
5a7a5555 JHS |
2210 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, |
2211 | struct qdisc_walker *arg) | |
1da177e4 LT |
2212 | { |
2213 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
2214 | ||
15e47304 | 2215 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 | 2216 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
0349b877 | 2217 | RTM_NEWTCLASS, NULL); |
1da177e4 LT |
2218 | } |
2219 | ||
30723673 DM |
2220 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
2221 | struct tcmsg *tcm, struct netlink_callback *cb, | |
2222 | int *t_p, int s_t) | |
2223 | { | |
2224 | struct qdisc_dump_args arg; | |
2225 | ||
49b49971 | 2226 | if (tc_qdisc_dump_ignore(q, false) || |
30723673 DM |
2227 | *t_p < s_t || !q->ops->cl_ops || |
2228 | (tcm->tcm_parent && | |
2229 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
2230 | (*t_p)++; | |
2231 | return 0; | |
2232 | } | |
2233 | if (*t_p > s_t) | |
2234 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
2235 | arg.w.fn = qdisc_class_dump; | |
2236 | arg.skb = skb; | |
2237 | arg.cb = cb; | |
2238 | arg.w.stop = 0; | |
2239 | arg.w.skip = cb->args[1]; | |
2240 | arg.w.count = 0; | |
2241 | q->ops->cl_ops->walk(q, &arg.w); | |
2242 | cb->args[1] = arg.w.count; | |
2243 | if (arg.w.stop) | |
2244 | return -1; | |
2245 | (*t_p)++; | |
2246 | return 0; | |
2247 | } | |
2248 | ||
2249 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
2250 | struct tcmsg *tcm, struct netlink_callback *cb, | |
bfc25605 | 2251 | int *t_p, int s_t, bool recur) |
30723673 DM |
2252 | { |
2253 | struct Qdisc *q; | |
59cc1f61 | 2254 | int b; |
30723673 DM |
2255 | |
2256 | if (!root) | |
2257 | return 0; | |
2258 | ||
2259 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
2260 | return -1; | |
2261 | ||
bfc25605 | 2262 | if (!qdisc_dev(root) || !recur) |
69012ae4 JK |
2263 | return 0; |
2264 | ||
cb395b20 ED |
2265 | if (tcm->tcm_parent) { |
2266 | q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent)); | |
3c53ed8f PS |
2267 | if (q && q != root && |
2268 | tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
cb395b20 ED |
2269 | return -1; |
2270 | return 0; | |
2271 | } | |
59cc1f61 | 2272 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
2273 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
2274 | return -1; | |
2275 | } | |
2276 | ||
2277 | return 0; | |
2278 | } | |
2279 | ||
1da177e4 LT |
2280 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
2281 | { | |
02ef22ca | 2282 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 2283 | struct net *net = sock_net(skb->sk); |
30723673 | 2284 | struct netdev_queue *dev_queue; |
1da177e4 | 2285 | struct net_device *dev; |
30723673 | 2286 | int t, s_t; |
1da177e4 | 2287 | |
573ce260 | 2288 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 2289 | return 0; |
cc7ec456 ED |
2290 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
2291 | if (!dev) | |
1da177e4 LT |
2292 | return 0; |
2293 | ||
2294 | s_t = cb->args[0]; | |
2295 | t = 0; | |
2296 | ||
5891cd5e ED |
2297 | if (tc_dump_tclass_root(rtnl_dereference(dev->qdisc), |
2298 | skb, tcm, cb, &t, s_t, true) < 0) | |
30723673 DM |
2299 | goto done; |
2300 | ||
24824a09 ED |
2301 | dev_queue = dev_ingress_queue(dev); |
2302 | if (dev_queue && | |
d636fc5d ED |
2303 | tc_dump_tclass_root(rtnl_dereference(dev_queue->qdisc_sleeping), |
2304 | skb, tcm, cb, &t, s_t, false) < 0) | |
30723673 | 2305 | goto done; |
1da177e4 | 2306 | |
30723673 | 2307 | done: |
1da177e4 LT |
2308 | cb->args[0] = t; |
2309 | ||
2310 | dev_put(dev); | |
2311 | return skb->len; | |
2312 | } | |
2313 | ||
1da177e4 LT |
2314 | #ifdef CONFIG_PROC_FS |
2315 | static int psched_show(struct seq_file *seq, void *v) | |
2316 | { | |
2317 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 2318 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 2319 | 1000000, |
1e317688 | 2320 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
2321 | |
2322 | return 0; | |
2323 | } | |
2324 | ||
7316ae88 TG |
2325 | static int __net_init psched_net_init(struct net *net) |
2326 | { | |
2327 | struct proc_dir_entry *e; | |
2328 | ||
3f3942ac | 2329 | e = proc_create_single("psched", 0, net->proc_net, psched_show); |
7316ae88 TG |
2330 | if (e == NULL) |
2331 | return -ENOMEM; | |
2332 | ||
2333 | return 0; | |
2334 | } | |
2335 | ||
2336 | static void __net_exit psched_net_exit(struct net *net) | |
2337 | { | |
ece31ffd | 2338 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
2339 | } |
2340 | #else | |
2341 | static int __net_init psched_net_init(struct net *net) | |
2342 | { | |
2343 | return 0; | |
2344 | } | |
2345 | ||
2346 | static void __net_exit psched_net_exit(struct net *net) | |
2347 | { | |
2348 | } | |
1da177e4 LT |
2349 | #endif |
2350 | ||
7316ae88 TG |
2351 | static struct pernet_operations psched_net_ops = { |
2352 | .init = psched_net_init, | |
2353 | .exit = psched_net_exit, | |
2354 | }; | |
2355 | ||
aefb2f2e | 2356 | #if IS_ENABLED(CONFIG_MITIGATION_RETPOLINE) |
7f0e8102 | 2357 | DEFINE_STATIC_KEY_FALSE(tc_skip_wrapper); |
8cde87b0 | 2358 | #endif |
7f0e8102 | 2359 | |
1da177e4 LT |
2360 | static int __init pktsched_init(void) |
2361 | { | |
7316ae88 TG |
2362 | int err; |
2363 | ||
2364 | err = register_pernet_subsys(&psched_net_ops); | |
2365 | if (err) { | |
cc7ec456 | 2366 | pr_err("pktsched_init: " |
7316ae88 TG |
2367 | "cannot initialize per netns operations\n"); |
2368 | return err; | |
2369 | } | |
2370 | ||
6da7c8fc | 2371 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
2372 | register_qdisc(&pfifo_qdisc_ops); |
2373 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 2374 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 2375 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 2376 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 2377 | |
b97bac64 FW |
2378 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0); |
2379 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0); | |
5a7a5555 | 2380 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, |
b97bac64 FW |
2381 | 0); |
2382 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0); | |
2383 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0); | |
5a7a5555 | 2384 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, |
b97bac64 | 2385 | 0); |
be577ddc | 2386 | |
7f0e8102 PT |
2387 | tc_wrapper_init(); |
2388 | ||
1da177e4 LT |
2389 | return 0; |
2390 | } | |
2391 | ||
2392 | subsys_initcall(pktsched_init); |