Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_api.c Packet scheduler API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Fixes: | |
12 | * | |
13 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. | |
14 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
15 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
1da177e4 | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/errno.h> |
1da177e4 | 23 | #include <linux/skbuff.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/proc_fs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/list.h> | |
4179477f | 29 | #include <linux/hrtimer.h> |
25bfcd5a | 30 | #include <linux/lockdep.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
1da177e4 | 32 | |
457c4cbc | 33 | #include <net/net_namespace.h> |
b854272b | 34 | #include <net/sock.h> |
dc5fc579 | 35 | #include <net/netlink.h> |
1da177e4 LT |
36 | #include <net/pkt_sched.h> |
37 | ||
7316ae88 TG |
38 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
39 | struct nlmsghdr *n, u32 clid, | |
1da177e4 | 40 | struct Qdisc *old, struct Qdisc *new); |
7316ae88 TG |
41 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
42 | struct nlmsghdr *n, struct Qdisc *q, | |
43 | unsigned long cl, int event); | |
1da177e4 LT |
44 | |
45 | /* | |
46 | ||
47 | Short review. | |
48 | ------------- | |
49 | ||
50 | This file consists of two interrelated parts: | |
51 | ||
52 | 1. queueing disciplines manager frontend. | |
53 | 2. traffic classes manager frontend. | |
54 | ||
55 | Generally, queueing discipline ("qdisc") is a black box, | |
56 | which is able to enqueue packets and to dequeue them (when | |
57 | device is ready to send something) in order and at times | |
58 | determined by algorithm hidden in it. | |
59 | ||
60 | qdisc's are divided to two categories: | |
61 | - "queues", which have no internal structure visible from outside. | |
62 | - "schedulers", which split all the packets to "traffic classes", | |
63 | using "packet classifiers" (look at cls_api.c) | |
64 | ||
65 | In turn, classes may have child qdiscs (as rule, queues) | |
66 | attached to them etc. etc. etc. | |
67 | ||
68 | The goal of the routines in this file is to translate | |
69 | information supplied by user in the form of handles | |
70 | to more intelligible for kernel form, to make some sanity | |
71 | checks and part of work, which is common to all qdiscs | |
72 | and to provide rtnetlink notifications. | |
73 | ||
74 | All real intelligent work is done inside qdisc modules. | |
75 | ||
76 | ||
77 | ||
78 | Every discipline has two major routines: enqueue and dequeue. | |
79 | ||
80 | ---dequeue | |
81 | ||
82 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
83 | but it does not mean that queue is empty, it just means that | |
84 | discipline does not want to send anything this time. | |
85 | Queue is really empty if q->q.qlen == 0. | |
86 | For complicated disciplines with multiple queues q->q is not | |
87 | real packet queue, but however q->q.qlen must be valid. | |
88 | ||
89 | ---enqueue | |
90 | ||
91 | enqueue returns 0, if packet was enqueued successfully. | |
92 | If packet (this one or another one) was dropped, it returns | |
93 | not zero error code. | |
94 | NET_XMIT_DROP - this packet dropped | |
95 | Expected action: do not backoff, but wait until queue will clear. | |
96 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
97 | Expected action: backoff or ignore | |
98 | NET_XMIT_POLICED - dropped by police. | |
99 | Expected action: backoff or error to real-time apps. | |
100 | ||
101 | Auxiliary routines: | |
102 | ||
99c0db26 JP |
103 | ---peek |
104 | ||
105 | like dequeue but without removing a packet from the queue | |
106 | ||
1da177e4 LT |
107 | ---reset |
108 | ||
109 | returns qdisc to initial state: purge all buffers, clear all | |
110 | timers, counters (except for statistics) etc. | |
111 | ||
112 | ---init | |
113 | ||
114 | initializes newly created qdisc. | |
115 | ||
116 | ---destroy | |
117 | ||
118 | destroys resources allocated by init and during lifetime of qdisc. | |
119 | ||
120 | ---change | |
121 | ||
122 | changes qdisc parameters. | |
123 | */ | |
124 | ||
125 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
126 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
127 | ||
128 | ||
129 | /************************************************ | |
130 | * Queueing disciplines manipulation. * | |
131 | ************************************************/ | |
132 | ||
133 | ||
134 | /* The list of all installed queueing disciplines. */ | |
135 | ||
136 | static struct Qdisc_ops *qdisc_base; | |
137 | ||
21eb2189 | 138 | /* Register/unregister queueing discipline */ |
1da177e4 LT |
139 | |
140 | int register_qdisc(struct Qdisc_ops *qops) | |
141 | { | |
142 | struct Qdisc_ops *q, **qp; | |
143 | int rc = -EEXIST; | |
144 | ||
145 | write_lock(&qdisc_mod_lock); | |
146 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
147 | if (!strcmp(qops->id, q->id)) | |
148 | goto out; | |
149 | ||
150 | if (qops->enqueue == NULL) | |
151 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 | 152 | if (qops->peek == NULL) { |
68fd26b5 | 153 | if (qops->dequeue == NULL) |
99c0db26 | 154 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
155 | else |
156 | goto out_einval; | |
99c0db26 | 157 | } |
1da177e4 LT |
158 | if (qops->dequeue == NULL) |
159 | qops->dequeue = noop_qdisc_ops.dequeue; | |
160 | ||
68fd26b5 JP |
161 | if (qops->cl_ops) { |
162 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
163 | ||
3e9e5a59 | 164 | if (!(cops->get && cops->put && cops->walk && cops->leaf)) |
68fd26b5 JP |
165 | goto out_einval; |
166 | ||
167 | if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf)) | |
168 | goto out_einval; | |
169 | } | |
170 | ||
1da177e4 LT |
171 | qops->next = NULL; |
172 | *qp = qops; | |
173 | rc = 0; | |
174 | out: | |
175 | write_unlock(&qdisc_mod_lock); | |
176 | return rc; | |
68fd26b5 JP |
177 | |
178 | out_einval: | |
179 | rc = -EINVAL; | |
180 | goto out; | |
1da177e4 | 181 | } |
62e3ba1b | 182 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
183 | |
184 | int unregister_qdisc(struct Qdisc_ops *qops) | |
185 | { | |
186 | struct Qdisc_ops *q, **qp; | |
187 | int err = -ENOENT; | |
188 | ||
189 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 190 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
191 | if (q == qops) |
192 | break; | |
193 | if (q) { | |
194 | *qp = q->next; | |
195 | q->next = NULL; | |
196 | err = 0; | |
197 | } | |
198 | write_unlock(&qdisc_mod_lock); | |
199 | return err; | |
200 | } | |
62e3ba1b | 201 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 | 202 | |
6da7c8fc | 203 | /* Get default qdisc if not otherwise specified */ |
204 | void qdisc_get_default(char *name, size_t len) | |
205 | { | |
206 | read_lock(&qdisc_mod_lock); | |
207 | strlcpy(name, default_qdisc_ops->id, len); | |
208 | read_unlock(&qdisc_mod_lock); | |
209 | } | |
210 | ||
211 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) | |
212 | { | |
213 | struct Qdisc_ops *q = NULL; | |
214 | ||
215 | for (q = qdisc_base; q; q = q->next) { | |
216 | if (!strcmp(name, q->id)) { | |
217 | if (!try_module_get(q->owner)) | |
218 | q = NULL; | |
219 | break; | |
220 | } | |
221 | } | |
222 | ||
223 | return q; | |
224 | } | |
225 | ||
226 | /* Set new default qdisc to use */ | |
227 | int qdisc_set_default(const char *name) | |
228 | { | |
229 | const struct Qdisc_ops *ops; | |
230 | ||
231 | if (!capable(CAP_NET_ADMIN)) | |
232 | return -EPERM; | |
233 | ||
234 | write_lock(&qdisc_mod_lock); | |
235 | ops = qdisc_lookup_default(name); | |
236 | if (!ops) { | |
237 | /* Not found, drop lock and try to load module */ | |
238 | write_unlock(&qdisc_mod_lock); | |
239 | request_module("sch_%s", name); | |
240 | write_lock(&qdisc_mod_lock); | |
241 | ||
242 | ops = qdisc_lookup_default(name); | |
243 | } | |
244 | ||
245 | if (ops) { | |
246 | /* Set new default */ | |
247 | module_put(default_qdisc_ops->owner); | |
248 | default_qdisc_ops = ops; | |
249 | } | |
250 | write_unlock(&qdisc_mod_lock); | |
251 | ||
252 | return ops ? 0 : -ENOENT; | |
253 | } | |
254 | ||
1da177e4 LT |
255 | /* We know handle. Find qdisc among all qdisc's attached to device |
256 | (root qdisc, all its children, children of children etc.) | |
257 | */ | |
258 | ||
6113b748 | 259 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
260 | { |
261 | struct Qdisc *q; | |
262 | ||
263 | if (!(root->flags & TCQ_F_BUILTIN) && | |
264 | root->handle == handle) | |
265 | return root; | |
266 | ||
267 | list_for_each_entry(q, &root->list, list) { | |
268 | if (q->handle == handle) | |
269 | return q; | |
270 | } | |
271 | return NULL; | |
272 | } | |
273 | ||
95dc1929 | 274 | void qdisc_list_add(struct Qdisc *q) |
f6e0b239 | 275 | { |
37314363 ED |
276 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
277 | struct Qdisc *root = qdisc_dev(q)->qdisc; | |
e57a784d | 278 | |
37314363 | 279 | WARN_ON_ONCE(root == &noop_qdisc); |
e57a784d | 280 | list_add_tail(&q->list, &root->list); |
37314363 | 281 | } |
f6e0b239 | 282 | } |
95dc1929 | 283 | EXPORT_SYMBOL(qdisc_list_add); |
f6e0b239 JP |
284 | |
285 | void qdisc_list_del(struct Qdisc *q) | |
286 | { | |
f6486d40 | 287 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
f6e0b239 | 288 | list_del(&q->list); |
f6e0b239 JP |
289 | } |
290 | EXPORT_SYMBOL(qdisc_list_del); | |
291 | ||
ead81cc5 | 292 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 293 | { |
f6e0b239 JP |
294 | struct Qdisc *q; |
295 | ||
af356afa PM |
296 | q = qdisc_match_from_root(dev->qdisc, handle); |
297 | if (q) | |
298 | goto out; | |
f6e0b239 | 299 | |
24824a09 ED |
300 | if (dev_ingress_queue(dev)) |
301 | q = qdisc_match_from_root( | |
302 | dev_ingress_queue(dev)->qdisc_sleeping, | |
303 | handle); | |
f6486d40 | 304 | out: |
f6e0b239 | 305 | return q; |
1da177e4 LT |
306 | } |
307 | ||
308 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
309 | { | |
310 | unsigned long cl; | |
311 | struct Qdisc *leaf; | |
20fea08b | 312 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
313 | |
314 | if (cops == NULL) | |
315 | return NULL; | |
316 | cl = cops->get(p, classid); | |
317 | ||
318 | if (cl == 0) | |
319 | return NULL; | |
320 | leaf = cops->leaf(p, cl); | |
321 | cops->put(p, cl); | |
322 | return leaf; | |
323 | } | |
324 | ||
325 | /* Find queueing discipline by name */ | |
326 | ||
1e90474c | 327 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
328 | { |
329 | struct Qdisc_ops *q = NULL; | |
330 | ||
331 | if (kind) { | |
332 | read_lock(&qdisc_mod_lock); | |
333 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 334 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
335 | if (!try_module_get(q->owner)) |
336 | q = NULL; | |
337 | break; | |
338 | } | |
339 | } | |
340 | read_unlock(&qdisc_mod_lock); | |
341 | } | |
342 | return q; | |
343 | } | |
344 | ||
8a8e3d84 JDB |
345 | /* The linklayer setting were not transferred from iproute2, in older |
346 | * versions, and the rate tables lookup systems have been dropped in | |
347 | * the kernel. To keep backward compatible with older iproute2 tc | |
348 | * utils, we detect the linklayer setting by detecting if the rate | |
349 | * table were modified. | |
350 | * | |
351 | * For linklayer ATM table entries, the rate table will be aligned to | |
352 | * 48 bytes, thus some table entries will contain the same value. The | |
353 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
354 | * starting from the mpu, we find low and high table entries for | |
355 | * mapping this cell. If these entries contain the same value, when | |
356 | * the rate tables have been modified for linklayer ATM. | |
357 | * | |
358 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
359 | * and then roundup to the next cell, calc the table entry one below, | |
360 | * and compare. | |
361 | */ | |
362 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
363 | { | |
364 | int low = roundup(r->mpu, 48); | |
365 | int high = roundup(low+1, 48); | |
366 | int cell_low = low >> r->cell_log; | |
367 | int cell_high = (high >> r->cell_log) - 1; | |
368 | ||
369 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
370 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
371 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
372 | return TC_LINKLAYER_ETHERNET; | |
373 | } | |
374 | ||
375 | if ((cell_high > cell_low) && (cell_high < 256) | |
376 | && (rtab[cell_low] == rtab[cell_high])) { | |
377 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
378 | cell_low, cell_high, rtab[cell_high]); | |
379 | return TC_LINKLAYER_ATM; | |
380 | } | |
381 | return TC_LINKLAYER_ETHERNET; | |
382 | } | |
383 | ||
1da177e4 LT |
384 | static struct qdisc_rate_table *qdisc_rtab_list; |
385 | ||
1e90474c | 386 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
387 | { |
388 | struct qdisc_rate_table *rtab; | |
389 | ||
40edeff6 ED |
390 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
391 | nla_len(tab) != TC_RTAB_SIZE) | |
392 | return NULL; | |
393 | ||
1da177e4 | 394 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
395 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
396 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
397 | rtab->refcnt++; |
398 | return rtab; | |
399 | } | |
400 | } | |
401 | ||
1da177e4 LT |
402 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
403 | if (rtab) { | |
404 | rtab->rate = *r; | |
405 | rtab->refcnt = 1; | |
1e90474c | 406 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
407 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
408 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
409 | rtab->next = qdisc_rtab_list; |
410 | qdisc_rtab_list = rtab; | |
411 | } | |
412 | return rtab; | |
413 | } | |
62e3ba1b | 414 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
415 | |
416 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
417 | { | |
418 | struct qdisc_rate_table *rtab, **rtabp; | |
419 | ||
420 | if (!tab || --tab->refcnt) | |
421 | return; | |
422 | ||
cc7ec456 ED |
423 | for (rtabp = &qdisc_rtab_list; |
424 | (rtab = *rtabp) != NULL; | |
425 | rtabp = &rtab->next) { | |
1da177e4 LT |
426 | if (rtab == tab) { |
427 | *rtabp = rtab->next; | |
428 | kfree(rtab); | |
429 | return; | |
430 | } | |
431 | } | |
432 | } | |
62e3ba1b | 433 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 434 | |
175f9c1b JK |
435 | static LIST_HEAD(qdisc_stab_list); |
436 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
437 | ||
438 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
439 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
440 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
441 | }; | |
442 | ||
443 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
444 | { | |
445 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
446 | struct qdisc_size_table *stab; | |
447 | struct tc_sizespec *s; | |
448 | unsigned int tsize = 0; | |
449 | u16 *tab = NULL; | |
450 | int err; | |
451 | ||
452 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
453 | if (err < 0) | |
454 | return ERR_PTR(err); | |
455 | if (!tb[TCA_STAB_BASE]) | |
456 | return ERR_PTR(-EINVAL); | |
457 | ||
458 | s = nla_data(tb[TCA_STAB_BASE]); | |
459 | ||
460 | if (s->tsize > 0) { | |
461 | if (!tb[TCA_STAB_DATA]) | |
462 | return ERR_PTR(-EINVAL); | |
463 | tab = nla_data(tb[TCA_STAB_DATA]); | |
464 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
465 | } | |
466 | ||
00093fab | 467 | if (tsize != s->tsize || (!tab && tsize > 0)) |
175f9c1b JK |
468 | return ERR_PTR(-EINVAL); |
469 | ||
f3b9605d | 470 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
471 | |
472 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
473 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
474 | continue; | |
475 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
476 | continue; | |
477 | stab->refcnt++; | |
f3b9605d | 478 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
479 | return stab; |
480 | } | |
481 | ||
f3b9605d | 482 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
483 | |
484 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
485 | if (!stab) | |
486 | return ERR_PTR(-ENOMEM); | |
487 | ||
488 | stab->refcnt = 1; | |
489 | stab->szopts = *s; | |
490 | if (tsize > 0) | |
491 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
492 | ||
f3b9605d | 493 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 494 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 495 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
496 | |
497 | return stab; | |
498 | } | |
499 | ||
a2da570d ED |
500 | static void stab_kfree_rcu(struct rcu_head *head) |
501 | { | |
502 | kfree(container_of(head, struct qdisc_size_table, rcu)); | |
503 | } | |
504 | ||
175f9c1b JK |
505 | void qdisc_put_stab(struct qdisc_size_table *tab) |
506 | { | |
507 | if (!tab) | |
508 | return; | |
509 | ||
f3b9605d | 510 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
511 | |
512 | if (--tab->refcnt == 0) { | |
513 | list_del(&tab->list); | |
a2da570d | 514 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
175f9c1b JK |
515 | } |
516 | ||
f3b9605d | 517 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
518 | } |
519 | EXPORT_SYMBOL(qdisc_put_stab); | |
520 | ||
521 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
522 | { | |
523 | struct nlattr *nest; | |
524 | ||
525 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
526 | if (nest == NULL) |
527 | goto nla_put_failure; | |
1b34ec43 DM |
528 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
529 | goto nla_put_failure; | |
175f9c1b JK |
530 | nla_nest_end(skb, nest); |
531 | ||
532 | return skb->len; | |
533 | ||
534 | nla_put_failure: | |
535 | return -1; | |
536 | } | |
537 | ||
a2da570d | 538 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab) |
175f9c1b JK |
539 | { |
540 | int pkt_len, slot; | |
541 | ||
542 | pkt_len = skb->len + stab->szopts.overhead; | |
543 | if (unlikely(!stab->szopts.tsize)) | |
544 | goto out; | |
545 | ||
546 | slot = pkt_len + stab->szopts.cell_align; | |
547 | if (unlikely(slot < 0)) | |
548 | slot = 0; | |
549 | ||
550 | slot >>= stab->szopts.cell_log; | |
551 | if (likely(slot < stab->szopts.tsize)) | |
552 | pkt_len = stab->data[slot]; | |
553 | else | |
554 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
555 | (slot / stab->szopts.tsize) + | |
556 | stab->data[slot % stab->szopts.tsize]; | |
557 | ||
558 | pkt_len <<= stab->szopts.size_log; | |
559 | out: | |
560 | if (unlikely(pkt_len < 1)) | |
561 | pkt_len = 1; | |
562 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
563 | } | |
a2da570d | 564 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 565 | |
6e765a00 | 566 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
567 | { |
568 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
569 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
570 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
571 | qdisc->flags |= TCQ_F_WARN_NONWC; |
572 | } | |
573 | } | |
574 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
575 | ||
4179477f PM |
576 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
577 | { | |
578 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 579 | timer); |
4179477f | 580 | |
1e203c1a | 581 | rcu_read_lock(); |
fd245a4a | 582 | qdisc_unthrottled(wd->qdisc); |
8608db03 | 583 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 584 | rcu_read_unlock(); |
1936502d | 585 | |
4179477f PM |
586 | return HRTIMER_NORESTART; |
587 | } | |
588 | ||
589 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
590 | { | |
4a8e320c | 591 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 592 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
593 | wd->qdisc = qdisc; |
594 | } | |
595 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
596 | ||
f2600cf0 | 597 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle) |
4179477f | 598 | { |
2540e051 JP |
599 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
600 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
601 | return; | |
602 | ||
f2600cf0 ED |
603 | if (throttle) |
604 | qdisc_throttled(wd->qdisc); | |
46baac38 ED |
605 | |
606 | hrtimer_start(&wd->timer, | |
34c5d292 | 607 | ns_to_ktime(expires), |
4a8e320c | 608 | HRTIMER_MODE_ABS_PINNED); |
4179477f | 609 | } |
34c5d292 | 610 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
4179477f PM |
611 | |
612 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
613 | { | |
2fbd3da3 | 614 | hrtimer_cancel(&wd->timer); |
fd245a4a | 615 | qdisc_unthrottled(wd->qdisc); |
4179477f PM |
616 | } |
617 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 618 | |
a94f779f | 619 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
620 | { |
621 | unsigned int size = n * sizeof(struct hlist_head), i; | |
622 | struct hlist_head *h; | |
623 | ||
624 | if (size <= PAGE_SIZE) | |
625 | h = kmalloc(size, GFP_KERNEL); | |
626 | else | |
627 | h = (struct hlist_head *) | |
628 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
629 | ||
630 | if (h != NULL) { | |
631 | for (i = 0; i < n; i++) | |
632 | INIT_HLIST_HEAD(&h[i]); | |
633 | } | |
634 | return h; | |
635 | } | |
636 | ||
637 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
638 | { | |
639 | unsigned int size = n * sizeof(struct hlist_head); | |
640 | ||
641 | if (size <= PAGE_SIZE) | |
642 | kfree(h); | |
643 | else | |
644 | free_pages((unsigned long)h, get_order(size)); | |
645 | } | |
646 | ||
647 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
648 | { | |
649 | struct Qdisc_class_common *cl; | |
b67bfe0d | 650 | struct hlist_node *next; |
6fe1c7a5 PM |
651 | struct hlist_head *nhash, *ohash; |
652 | unsigned int nsize, nmask, osize; | |
653 | unsigned int i, h; | |
654 | ||
655 | /* Rehash when load factor exceeds 0.75 */ | |
656 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
657 | return; | |
658 | nsize = clhash->hashsize * 2; | |
659 | nmask = nsize - 1; | |
660 | nhash = qdisc_class_hash_alloc(nsize); | |
661 | if (nhash == NULL) | |
662 | return; | |
663 | ||
664 | ohash = clhash->hash; | |
665 | osize = clhash->hashsize; | |
666 | ||
667 | sch_tree_lock(sch); | |
668 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 669 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
670 | h = qdisc_class_hash(cl->classid, nmask); |
671 | hlist_add_head(&cl->hnode, &nhash[h]); | |
672 | } | |
673 | } | |
674 | clhash->hash = nhash; | |
675 | clhash->hashsize = nsize; | |
676 | clhash->hashmask = nmask; | |
677 | sch_tree_unlock(sch); | |
678 | ||
679 | qdisc_class_hash_free(ohash, osize); | |
680 | } | |
681 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
682 | ||
683 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
684 | { | |
685 | unsigned int size = 4; | |
686 | ||
687 | clhash->hash = qdisc_class_hash_alloc(size); | |
688 | if (clhash->hash == NULL) | |
689 | return -ENOMEM; | |
690 | clhash->hashsize = size; | |
691 | clhash->hashmask = size - 1; | |
692 | clhash->hashelems = 0; | |
693 | return 0; | |
694 | } | |
695 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
696 | ||
697 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
698 | { | |
699 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
700 | } | |
701 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
702 | ||
703 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
704 | struct Qdisc_class_common *cl) | |
705 | { | |
706 | unsigned int h; | |
707 | ||
708 | INIT_HLIST_NODE(&cl->hnode); | |
709 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
710 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
711 | clhash->hashelems++; | |
712 | } | |
713 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
714 | ||
715 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
716 | struct Qdisc_class_common *cl) | |
717 | { | |
718 | hlist_del(&cl->hnode); | |
719 | clhash->hashelems--; | |
720 | } | |
721 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
722 | ||
fa0f5aa7 ED |
723 | /* Allocate an unique handle from space managed by kernel |
724 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
725 | */ | |
1da177e4 LT |
726 | static u32 qdisc_alloc_handle(struct net_device *dev) |
727 | { | |
fa0f5aa7 | 728 | int i = 0x8000; |
1da177e4 LT |
729 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
730 | ||
731 | do { | |
732 | autohandle += TC_H_MAKE(0x10000U, 0); | |
733 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
734 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
735 | if (!qdisc_lookup(dev, autohandle)) |
736 | return autohandle; | |
737 | cond_resched(); | |
738 | } while (--i > 0); | |
1da177e4 | 739 | |
fa0f5aa7 | 740 | return 0; |
1da177e4 LT |
741 | } |
742 | ||
43effa1e PM |
743 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
744 | { | |
20fea08b | 745 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
746 | unsigned long cl; |
747 | u32 parentid; | |
2c8c8e6f | 748 | int drops; |
43effa1e PM |
749 | |
750 | if (n == 0) | |
751 | return; | |
2c8c8e6f | 752 | drops = max_t(int, n, 0); |
43effa1e | 753 | while ((parentid = sch->parent)) { |
066a3b5b JP |
754 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
755 | return; | |
756 | ||
5ce2d488 | 757 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
758 | if (sch == NULL) { |
759 | WARN_ON(parentid != TC_H_ROOT); | |
760 | return; | |
761 | } | |
43effa1e PM |
762 | cops = sch->ops->cl_ops; |
763 | if (cops->qlen_notify) { | |
764 | cl = cops->get(sch, parentid); | |
765 | cops->qlen_notify(sch, cl); | |
766 | cops->put(sch, cl); | |
767 | } | |
768 | sch->q.qlen -= n; | |
25331d6c | 769 | __qdisc_qstats_drop(sch, drops); |
43effa1e PM |
770 | } |
771 | } | |
772 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 773 | |
7316ae88 TG |
774 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
775 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
776 | struct Qdisc *old, struct Qdisc *new) |
777 | { | |
778 | if (new || old) | |
7316ae88 | 779 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 780 | |
4d8863a2 | 781 | if (old) |
99194cff | 782 | qdisc_destroy(old); |
99194cff DM |
783 | } |
784 | ||
785 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
786 | * to device "dev". | |
787 | * | |
788 | * When appropriate send a netlink notification using 'skb' | |
789 | * and "n". | |
790 | * | |
791 | * On success, destroy old qdisc. | |
1da177e4 LT |
792 | */ |
793 | ||
794 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
795 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
796 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 797 | { |
99194cff | 798 | struct Qdisc *q = old; |
7316ae88 | 799 | struct net *net = dev_net(dev); |
1da177e4 | 800 | int err = 0; |
1da177e4 | 801 | |
10297b99 | 802 | if (parent == NULL) { |
99194cff DM |
803 | unsigned int i, num_q, ingress; |
804 | ||
805 | ingress = 0; | |
806 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
807 | if ((q && q->flags & TCQ_F_INGRESS) || |
808 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
809 | num_q = 1; |
810 | ingress = 1; | |
24824a09 ED |
811 | if (!dev_ingress_queue(dev)) |
812 | return -ENOENT; | |
99194cff DM |
813 | } |
814 | ||
815 | if (dev->flags & IFF_UP) | |
816 | dev_deactivate(dev); | |
817 | ||
86e363dc WC |
818 | if (new && new->ops->attach) |
819 | goto skip; | |
6ec1c69a | 820 | |
99194cff | 821 | for (i = 0; i < num_q; i++) { |
24824a09 | 822 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
823 | |
824 | if (!ingress) | |
825 | dev_queue = netdev_get_tx_queue(dev, i); | |
826 | ||
8d50b53d DM |
827 | old = dev_graft_qdisc(dev_queue, new); |
828 | if (new && i > 0) | |
829 | atomic_inc(&new->refcnt); | |
830 | ||
036d6a67 JP |
831 | if (!ingress) |
832 | qdisc_destroy(old); | |
1da177e4 | 833 | } |
99194cff | 834 | |
86e363dc | 835 | skip: |
036d6a67 | 836 | if (!ingress) { |
7316ae88 TG |
837 | notify_and_destroy(net, skb, n, classid, |
838 | dev->qdisc, new); | |
036d6a67 JP |
839 | if (new && !new->ops->attach) |
840 | atomic_inc(&new->refcnt); | |
841 | dev->qdisc = new ? : &noop_qdisc; | |
86e363dc WC |
842 | |
843 | if (new && new->ops->attach) | |
844 | new->ops->attach(new); | |
036d6a67 | 845 | } else { |
7316ae88 | 846 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 847 | } |
af356afa | 848 | |
99194cff DM |
849 | if (dev->flags & IFF_UP) |
850 | dev_activate(dev); | |
1da177e4 | 851 | } else { |
20fea08b | 852 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 853 | |
c9f1d038 PM |
854 | err = -EOPNOTSUPP; |
855 | if (cops && cops->graft) { | |
1da177e4 LT |
856 | unsigned long cl = cops->get(parent, classid); |
857 | if (cl) { | |
99194cff | 858 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 859 | cops->put(parent, cl); |
c9f1d038 PM |
860 | } else |
861 | err = -ENOENT; | |
1da177e4 | 862 | } |
99194cff | 863 | if (!err) |
7316ae88 | 864 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
865 | } |
866 | return err; | |
867 | } | |
868 | ||
25bfcd5a JP |
869 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
870 | static struct lock_class_key qdisc_tx_lock; | |
871 | static struct lock_class_key qdisc_rx_lock; | |
872 | ||
1da177e4 LT |
873 | /* |
874 | Allocate and initialize new qdisc. | |
875 | ||
876 | Parameters are passed via opt. | |
877 | */ | |
878 | ||
879 | static struct Qdisc * | |
bb949fbd | 880 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
23bcf634 PM |
881 | struct Qdisc *p, u32 parent, u32 handle, |
882 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
883 | { |
884 | int err; | |
1e90474c | 885 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
886 | struct Qdisc *sch; |
887 | struct Qdisc_ops *ops; | |
175f9c1b | 888 | struct qdisc_size_table *stab; |
1da177e4 LT |
889 | |
890 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 891 | #ifdef CONFIG_MODULES |
1da177e4 LT |
892 | if (ops == NULL && kind != NULL) { |
893 | char name[IFNAMSIZ]; | |
1e90474c | 894 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
895 | /* We dropped the RTNL semaphore in order to |
896 | * perform the module load. So, even if we | |
897 | * succeeded in loading the module we have to | |
898 | * tell the caller to replay the request. We | |
899 | * indicate this using -EAGAIN. | |
900 | * We replay the request because the device may | |
901 | * go away in the mean time. | |
902 | */ | |
903 | rtnl_unlock(); | |
904 | request_module("sch_%s", name); | |
905 | rtnl_lock(); | |
906 | ops = qdisc_lookup_ops(kind); | |
907 | if (ops != NULL) { | |
908 | /* We will try again qdisc_lookup_ops, | |
909 | * so don't keep a reference. | |
910 | */ | |
911 | module_put(ops->owner); | |
912 | err = -EAGAIN; | |
913 | goto err_out; | |
914 | } | |
915 | } | |
916 | } | |
917 | #endif | |
918 | ||
b9e2cc0f | 919 | err = -ENOENT; |
1da177e4 LT |
920 | if (ops == NULL) |
921 | goto err_out; | |
922 | ||
5ce2d488 | 923 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
924 | if (IS_ERR(sch)) { |
925 | err = PTR_ERR(sch); | |
1da177e4 | 926 | goto err_out2; |
3d54b82f | 927 | } |
1da177e4 | 928 | |
ffc8fefa PM |
929 | sch->parent = parent; |
930 | ||
3d54b82f | 931 | if (handle == TC_H_INGRESS) { |
1da177e4 | 932 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 933 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 934 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 935 | } else { |
fd44de7c PM |
936 | if (handle == 0) { |
937 | handle = qdisc_alloc_handle(dev); | |
938 | err = -ENOMEM; | |
939 | if (handle == 0) | |
940 | goto err_out3; | |
941 | } | |
25bfcd5a | 942 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1abbe139 ED |
943 | if (!netif_is_multiqueue(dev)) |
944 | sch->flags |= TCQ_F_ONETXQUEUE; | |
1da177e4 LT |
945 | } |
946 | ||
3d54b82f | 947 | sch->handle = handle; |
1da177e4 | 948 | |
1e90474c | 949 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
22e0f8b9 JF |
950 | if (qdisc_is_percpu_stats(sch)) { |
951 | sch->cpu_bstats = | |
7c1c97d5 | 952 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
22e0f8b9 JF |
953 | if (!sch->cpu_bstats) |
954 | goto err_out4; | |
b0ab6f92 JF |
955 | |
956 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
957 | if (!sch->cpu_qstats) | |
958 | goto err_out4; | |
22e0f8b9 JF |
959 | } |
960 | ||
175f9c1b JK |
961 | if (tca[TCA_STAB]) { |
962 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
963 | if (IS_ERR(stab)) { | |
964 | err = PTR_ERR(stab); | |
7c64b9f3 | 965 | goto err_out4; |
175f9c1b | 966 | } |
a2da570d | 967 | rcu_assign_pointer(sch->stab, stab); |
175f9c1b | 968 | } |
1e90474c | 969 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
970 | spinlock_t *root_lock; |
971 | ||
23bcf634 PM |
972 | err = -EOPNOTSUPP; |
973 | if (sch->flags & TCQ_F_MQROOT) | |
974 | goto err_out4; | |
975 | ||
f6f9b93f | 976 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
977 | !(sch->flags & TCQ_F_INGRESS) && |
978 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
f6f9b93f JP |
979 | root_lock = qdisc_root_sleeping_lock(sch); |
980 | else | |
981 | root_lock = qdisc_lock(sch); | |
982 | ||
22e0f8b9 JF |
983 | err = gen_new_estimator(&sch->bstats, |
984 | sch->cpu_bstats, | |
985 | &sch->rate_est, | |
986 | root_lock, | |
987 | tca[TCA_RATE]); | |
23bcf634 PM |
988 | if (err) |
989 | goto err_out4; | |
023e09a7 | 990 | } |
f6e0b239 JP |
991 | |
992 | qdisc_list_add(sch); | |
1da177e4 | 993 | |
1da177e4 LT |
994 | return sch; |
995 | } | |
996 | err_out3: | |
997 | dev_put(dev); | |
3d54b82f | 998 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
999 | err_out2: |
1000 | module_put(ops->owner); | |
1001 | err_out: | |
1002 | *errp = err; | |
1da177e4 | 1003 | return NULL; |
23bcf634 PM |
1004 | |
1005 | err_out4: | |
22e0f8b9 | 1006 | free_percpu(sch->cpu_bstats); |
b0ab6f92 | 1007 | free_percpu(sch->cpu_qstats); |
23bcf634 PM |
1008 | /* |
1009 | * Any broken qdiscs that would require a ops->reset() here? | |
1010 | * The qdisc was never in action so it shouldn't be necessary. | |
1011 | */ | |
a2da570d | 1012 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1013 | if (ops->destroy) |
1014 | ops->destroy(sch); | |
1015 | goto err_out3; | |
1da177e4 LT |
1016 | } |
1017 | ||
1e90474c | 1018 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 1019 | { |
a2da570d | 1020 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1021 | int err = 0; |
1da177e4 | 1022 | |
175f9c1b | 1023 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
1024 | if (sch->ops->change == NULL) |
1025 | return -EINVAL; | |
1e90474c | 1026 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
1027 | if (err) |
1028 | return err; | |
1029 | } | |
175f9c1b JK |
1030 | |
1031 | if (tca[TCA_STAB]) { | |
1032 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
1033 | if (IS_ERR(stab)) | |
1034 | return PTR_ERR(stab); | |
1035 | } | |
1036 | ||
a2da570d ED |
1037 | ostab = rtnl_dereference(sch->stab); |
1038 | rcu_assign_pointer(sch->stab, stab); | |
1039 | qdisc_put_stab(ostab); | |
175f9c1b | 1040 | |
23bcf634 | 1041 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1042 | /* NB: ignores errors from replace_estimator |
1043 | because change can't be undone. */ | |
23bcf634 PM |
1044 | if (sch->flags & TCQ_F_MQROOT) |
1045 | goto out; | |
22e0f8b9 JF |
1046 | gen_replace_estimator(&sch->bstats, |
1047 | sch->cpu_bstats, | |
1048 | &sch->rate_est, | |
1049 | qdisc_root_sleeping_lock(sch), | |
1050 | tca[TCA_RATE]); | |
23bcf634 PM |
1051 | } |
1052 | out: | |
1da177e4 LT |
1053 | return 0; |
1054 | } | |
1055 | ||
cc7ec456 ED |
1056 | struct check_loop_arg { |
1057 | struct qdisc_walker w; | |
1da177e4 LT |
1058 | struct Qdisc *p; |
1059 | int depth; | |
1060 | }; | |
1061 | ||
1062 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
1063 | ||
1064 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1065 | { | |
1066 | struct check_loop_arg arg; | |
1067 | ||
1068 | if (q->ops->cl_ops == NULL) | |
1069 | return 0; | |
1070 | ||
1071 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1072 | arg.w.fn = check_loop_fn; | |
1073 | arg.depth = depth; | |
1074 | arg.p = p; | |
1075 | q->ops->cl_ops->walk(q, &arg.w); | |
1076 | return arg.w.stop ? -ELOOP : 0; | |
1077 | } | |
1078 | ||
1079 | static int | |
1080 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1081 | { | |
1082 | struct Qdisc *leaf; | |
20fea08b | 1083 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1084 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1085 | ||
1086 | leaf = cops->leaf(q, cl); | |
1087 | if (leaf) { | |
1088 | if (leaf == arg->p || arg->depth > 7) | |
1089 | return -ELOOP; | |
1090 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1091 | } | |
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * Delete/get qdisc. | |
1097 | */ | |
1098 | ||
661d2967 | 1099 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1100 | { |
3b1e0a65 | 1101 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1102 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1103 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1104 | struct net_device *dev; |
de179c8c | 1105 | u32 clid; |
1da177e4 LT |
1106 | struct Qdisc *q = NULL; |
1107 | struct Qdisc *p = NULL; | |
1108 | int err; | |
1109 | ||
4e8bbb81 | 1110 | if ((n->nlmsg_type != RTM_GETQDISC) && |
5f013c9b | 1111 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1112 | return -EPERM; |
1113 | ||
1e90474c PM |
1114 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1115 | if (err < 0) | |
1116 | return err; | |
1117 | ||
de179c8c H |
1118 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1119 | if (!dev) | |
1120 | return -ENODEV; | |
1121 | ||
1122 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1123 | if (clid) { |
1124 | if (clid != TC_H_ROOT) { | |
1125 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 ED |
1126 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1127 | if (!p) | |
1da177e4 LT |
1128 | return -ENOENT; |
1129 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1130 | } else if (dev_ingress_queue(dev)) { |
1131 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1132 | } |
1da177e4 | 1133 | } else { |
af356afa | 1134 | q = dev->qdisc; |
1da177e4 LT |
1135 | } |
1136 | if (!q) | |
1137 | return -ENOENT; | |
1138 | ||
1139 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
1140 | return -EINVAL; | |
1141 | } else { | |
cc7ec456 ED |
1142 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1143 | if (!q) | |
1da177e4 LT |
1144 | return -ENOENT; |
1145 | } | |
1146 | ||
1e90474c | 1147 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1148 | return -EINVAL; |
1149 | ||
1150 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1151 | if (!clid) | |
1152 | return -EINVAL; | |
1153 | if (q->handle == 0) | |
1154 | return -ENOENT; | |
cc7ec456 ED |
1155 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
1156 | if (err != 0) | |
1da177e4 | 1157 | return err; |
1da177e4 | 1158 | } else { |
7316ae88 | 1159 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1160 | } |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | /* | |
cc7ec456 | 1165 | * Create/change qdisc. |
1da177e4 LT |
1166 | */ |
1167 | ||
661d2967 | 1168 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1169 | { |
3b1e0a65 | 1170 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1171 | struct tcmsg *tcm; |
1e90474c | 1172 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1173 | struct net_device *dev; |
1174 | u32 clid; | |
1175 | struct Qdisc *q, *p; | |
1176 | int err; | |
1177 | ||
5f013c9b | 1178 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1179 | return -EPERM; |
1180 | ||
1da177e4 LT |
1181 | replay: |
1182 | /* Reinit, just in case something touches this. */ | |
de179c8c H |
1183 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1184 | if (err < 0) | |
1185 | return err; | |
1186 | ||
02ef22ca | 1187 | tcm = nlmsg_data(n); |
1da177e4 LT |
1188 | clid = tcm->tcm_parent; |
1189 | q = p = NULL; | |
1190 | ||
cc7ec456 ED |
1191 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1192 | if (!dev) | |
1da177e4 LT |
1193 | return -ENODEV; |
1194 | ||
1e90474c | 1195 | |
1da177e4 LT |
1196 | if (clid) { |
1197 | if (clid != TC_H_ROOT) { | |
1198 | if (clid != TC_H_INGRESS) { | |
cc7ec456 ED |
1199 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1200 | if (!p) | |
1da177e4 LT |
1201 | return -ENOENT; |
1202 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1203 | } else if (dev_ingress_queue_create(dev)) { |
1204 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1205 | } |
1206 | } else { | |
af356afa | 1207 | q = dev->qdisc; |
1da177e4 LT |
1208 | } |
1209 | ||
1210 | /* It may be default qdisc, ignore it */ | |
1211 | if (q && q->handle == 0) | |
1212 | q = NULL; | |
1213 | ||
1214 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1215 | if (tcm->tcm_handle) { | |
cc7ec456 | 1216 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
1da177e4 LT |
1217 | return -EEXIST; |
1218 | if (TC_H_MIN(tcm->tcm_handle)) | |
1219 | return -EINVAL; | |
cc7ec456 ED |
1220 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1221 | if (!q) | |
1da177e4 | 1222 | goto create_n_graft; |
cc7ec456 | 1223 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1224 | return -EEXIST; |
1e90474c | 1225 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1226 | return -EINVAL; |
1227 | if (q == p || | |
1228 | (p && check_loop(q, p, 0))) | |
1229 | return -ELOOP; | |
1230 | atomic_inc(&q->refcnt); | |
1231 | goto graft; | |
1232 | } else { | |
cc7ec456 | 1233 | if (!q) |
1da177e4 LT |
1234 | goto create_n_graft; |
1235 | ||
1236 | /* This magic test requires explanation. | |
1237 | * | |
1238 | * We know, that some child q is already | |
1239 | * attached to this parent and have choice: | |
1240 | * either to change it or to create/graft new one. | |
1241 | * | |
1242 | * 1. We are allowed to create/graft only | |
1243 | * if CREATE and REPLACE flags are set. | |
1244 | * | |
1245 | * 2. If EXCL is set, requestor wanted to say, | |
1246 | * that qdisc tcm_handle is not expected | |
1247 | * to exist, so that we choose create/graft too. | |
1248 | * | |
1249 | * 3. The last case is when no flags are set. | |
1250 | * Alas, it is sort of hole in API, we | |
1251 | * cannot decide what to do unambiguously. | |
1252 | * For now we select create/graft, if | |
1253 | * user gave KIND, which does not match existing. | |
1254 | */ | |
cc7ec456 ED |
1255 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1256 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1257 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1258 | (tca[TCA_KIND] && |
1259 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1260 | goto create_n_graft; |
1261 | } | |
1262 | } | |
1263 | } else { | |
1264 | if (!tcm->tcm_handle) | |
1265 | return -EINVAL; | |
1266 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1267 | } | |
1268 | ||
1269 | /* Change qdisc parameters */ | |
1270 | if (q == NULL) | |
1271 | return -ENOENT; | |
cc7ec456 | 1272 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1273 | return -EEXIST; |
1e90474c | 1274 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1275 | return -EINVAL; |
1276 | err = qdisc_change(q, tca); | |
1277 | if (err == 0) | |
7316ae88 | 1278 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1279 | return err; |
1280 | ||
1281 | create_n_graft: | |
cc7ec456 | 1282 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
1da177e4 | 1283 | return -ENOENT; |
24824a09 ED |
1284 | if (clid == TC_H_INGRESS) { |
1285 | if (dev_ingress_queue(dev)) | |
1286 | q = qdisc_create(dev, dev_ingress_queue(dev), p, | |
1287 | tcm->tcm_parent, tcm->tcm_parent, | |
1288 | tca, &err); | |
1289 | else | |
1290 | err = -ENOENT; | |
1291 | } else { | |
926e61b7 | 1292 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1293 | |
1294 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1295 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1296 | else if (p) | |
1297 | dev_queue = p->dev_queue; | |
1298 | else | |
1299 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1300 | |
926e61b7 | 1301 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1302 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1303 | tca, &err); |
6ec1c69a | 1304 | } |
1da177e4 LT |
1305 | if (q == NULL) { |
1306 | if (err == -EAGAIN) | |
1307 | goto replay; | |
1308 | return err; | |
1309 | } | |
1310 | ||
1311 | graft: | |
e5befbd9 IJ |
1312 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1313 | if (err) { | |
1314 | if (q) | |
1315 | qdisc_destroy(q); | |
1316 | return err; | |
1da177e4 | 1317 | } |
e5befbd9 | 1318 | |
1da177e4 LT |
1319 | return 0; |
1320 | } | |
1321 | ||
1322 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
15e47304 | 1323 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 | 1324 | { |
22e0f8b9 | 1325 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; |
b0ab6f92 | 1326 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; |
1da177e4 LT |
1327 | struct tcmsg *tcm; |
1328 | struct nlmsghdr *nlh; | |
27a884dc | 1329 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1330 | struct gnet_dump d; |
a2da570d | 1331 | struct qdisc_size_table *stab; |
64015853 | 1332 | __u32 qlen; |
1da177e4 | 1333 | |
fba373d2 | 1334 | cond_resched(); |
15e47304 | 1335 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1336 | if (!nlh) |
1337 | goto out_nlmsg_trim; | |
1338 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1339 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 PM |
1340 | tcm->tcm__pad1 = 0; |
1341 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1342 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1343 | tcm->tcm_parent = clid; |
1344 | tcm->tcm_handle = q->handle; | |
1345 | tcm->tcm_info = atomic_read(&q->refcnt); | |
1b34ec43 DM |
1346 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1347 | goto nla_put_failure; | |
1da177e4 | 1348 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1349 | goto nla_put_failure; |
64015853 | 1350 | qlen = q->q.qlen; |
1da177e4 | 1351 | |
a2da570d ED |
1352 | stab = rtnl_dereference(q->stab); |
1353 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
175f9c1b JK |
1354 | goto nla_put_failure; |
1355 | ||
102396ae JP |
1356 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1357 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1358 | goto nla_put_failure; |
1da177e4 LT |
1359 | |
1360 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1361 | goto nla_put_failure; |
1da177e4 | 1362 | |
b0ab6f92 | 1363 | if (qdisc_is_percpu_stats(q)) { |
22e0f8b9 | 1364 | cpu_bstats = q->cpu_bstats; |
b0ab6f92 JF |
1365 | cpu_qstats = q->cpu_qstats; |
1366 | } | |
22e0f8b9 JF |
1367 | |
1368 | if (gnet_stats_copy_basic(&d, cpu_bstats, &q->bstats) < 0 || | |
d250a5f9 | 1369 | gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || |
b0ab6f92 | 1370 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) |
1e90474c | 1371 | goto nla_put_failure; |
10297b99 | 1372 | |
1da177e4 | 1373 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1374 | goto nla_put_failure; |
10297b99 | 1375 | |
27a884dc | 1376 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1377 | return skb->len; |
1378 | ||
02ef22ca | 1379 | out_nlmsg_trim: |
1e90474c | 1380 | nla_put_failure: |
dc5fc579 | 1381 | nlmsg_trim(skb, b); |
1da177e4 LT |
1382 | return -1; |
1383 | } | |
1384 | ||
53b0f080 ED |
1385 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1386 | { | |
1387 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1388 | } | |
1389 | ||
7316ae88 TG |
1390 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1391 | struct nlmsghdr *n, u32 clid, | |
1392 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1393 | { |
1394 | struct sk_buff *skb; | |
15e47304 | 1395 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1396 | |
1397 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1398 | if (!skb) | |
1399 | return -ENOBUFS; | |
1400 | ||
53b0f080 | 1401 | if (old && !tc_qdisc_dump_ignore(old)) { |
15e47304 | 1402 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1403 | 0, RTM_DELQDISC) < 0) |
1da177e4 LT |
1404 | goto err_out; |
1405 | } | |
53b0f080 | 1406 | if (new && !tc_qdisc_dump_ignore(new)) { |
15e47304 | 1407 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1408 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
1da177e4 LT |
1409 | goto err_out; |
1410 | } | |
1411 | ||
1412 | if (skb->len) | |
15e47304 | 1413 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1414 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1415 | |
1416 | err_out: | |
1417 | kfree_skb(skb); | |
1418 | return -EINVAL; | |
1419 | } | |
1420 | ||
30723673 DM |
1421 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1422 | struct netlink_callback *cb, | |
1423 | int *q_idx_p, int s_q_idx) | |
1424 | { | |
1425 | int ret = 0, q_idx = *q_idx_p; | |
1426 | struct Qdisc *q; | |
1427 | ||
1428 | if (!root) | |
1429 | return 0; | |
1430 | ||
1431 | q = root; | |
1432 | if (q_idx < s_q_idx) { | |
1433 | q_idx++; | |
1434 | } else { | |
1435 | if (!tc_qdisc_dump_ignore(q) && | |
15e47304 | 1436 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1437 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1438 | goto done; | |
1439 | q_idx++; | |
1440 | } | |
1441 | list_for_each_entry(q, &root->list, list) { | |
1442 | if (q_idx < s_q_idx) { | |
1443 | q_idx++; | |
1444 | continue; | |
1445 | } | |
cc7ec456 | 1446 | if (!tc_qdisc_dump_ignore(q) && |
15e47304 | 1447 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1448 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1449 | goto done; | |
1450 | q_idx++; | |
1451 | } | |
1452 | ||
1453 | out: | |
1454 | *q_idx_p = q_idx; | |
1455 | return ret; | |
1456 | done: | |
1457 | ret = -1; | |
1458 | goto out; | |
1459 | } | |
1460 | ||
1da177e4 LT |
1461 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1462 | { | |
3b1e0a65 | 1463 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1464 | int idx, q_idx; |
1465 | int s_idx, s_q_idx; | |
1466 | struct net_device *dev; | |
1da177e4 LT |
1467 | |
1468 | s_idx = cb->args[0]; | |
1469 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1470 | |
7562f876 | 1471 | idx = 0; |
15dc36eb ED |
1472 | ASSERT_RTNL(); |
1473 | for_each_netdev(net, dev) { | |
30723673 DM |
1474 | struct netdev_queue *dev_queue; |
1475 | ||
1da177e4 | 1476 | if (idx < s_idx) |
7562f876 | 1477 | goto cont; |
1da177e4 LT |
1478 | if (idx > s_idx) |
1479 | s_q_idx = 0; | |
1da177e4 | 1480 | q_idx = 0; |
30723673 | 1481 | |
af356afa | 1482 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1483 | goto done; |
1484 | ||
24824a09 ED |
1485 | dev_queue = dev_ingress_queue(dev); |
1486 | if (dev_queue && | |
1487 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
1488 | &q_idx, s_q_idx) < 0) | |
30723673 DM |
1489 | goto done; |
1490 | ||
7562f876 PE |
1491 | cont: |
1492 | idx++; | |
1da177e4 LT |
1493 | } |
1494 | ||
1495 | done: | |
1da177e4 LT |
1496 | cb->args[0] = idx; |
1497 | cb->args[1] = q_idx; | |
1498 | ||
1499 | return skb->len; | |
1500 | } | |
1501 | ||
1502 | ||
1503 | ||
1504 | /************************************************ | |
1505 | * Traffic classes manipulation. * | |
1506 | ************************************************/ | |
1507 | ||
1508 | ||
1509 | ||
661d2967 | 1510 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1511 | { |
3b1e0a65 | 1512 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1513 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1514 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1515 | struct net_device *dev; |
1516 | struct Qdisc *q = NULL; | |
20fea08b | 1517 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1518 | unsigned long cl = 0; |
1519 | unsigned long new_cl; | |
de179c8c H |
1520 | u32 portid; |
1521 | u32 clid; | |
1522 | u32 qid; | |
1da177e4 LT |
1523 | int err; |
1524 | ||
4e8bbb81 | 1525 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
5f013c9b | 1526 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1527 | return -EPERM; |
1528 | ||
1e90474c PM |
1529 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1530 | if (err < 0) | |
1531 | return err; | |
1532 | ||
de179c8c H |
1533 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1534 | if (!dev) | |
1535 | return -ENODEV; | |
1536 | ||
1da177e4 LT |
1537 | /* |
1538 | parent == TC_H_UNSPEC - unspecified parent. | |
1539 | parent == TC_H_ROOT - class is root, which has no parent. | |
1540 | parent == X:0 - parent is root class. | |
1541 | parent == X:Y - parent is a node in hierarchy. | |
1542 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1543 | ||
1544 | handle == 0:0 - generate handle from kernel pool. | |
1545 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1546 | handle == X:Y - clear. | |
1547 | handle == X:0 - root class. | |
1548 | */ | |
1549 | ||
1550 | /* Step 1. Determine qdisc handle X:0 */ | |
1551 | ||
de179c8c H |
1552 | portid = tcm->tcm_parent; |
1553 | clid = tcm->tcm_handle; | |
1554 | qid = TC_H_MAJ(clid); | |
1555 | ||
15e47304 EB |
1556 | if (portid != TC_H_ROOT) { |
1557 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
1558 | |
1559 | if (qid && qid1) { | |
1560 | /* If both majors are known, they must be identical. */ | |
1561 | if (qid != qid1) | |
1562 | return -EINVAL; | |
1563 | } else if (qid1) { | |
1564 | qid = qid1; | |
1565 | } else if (qid == 0) | |
af356afa | 1566 | qid = dev->qdisc->handle; |
1da177e4 LT |
1567 | |
1568 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1569 | * both with parent and child. |
1570 | * | |
15e47304 | 1571 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 1572 | */ |
15e47304 EB |
1573 | if (portid) |
1574 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
1575 | } else { |
1576 | if (qid == 0) | |
af356afa | 1577 | qid = dev->qdisc->handle; |
1da177e4 LT |
1578 | } |
1579 | ||
1580 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1581 | q = qdisc_lookup(dev, qid); |
1582 | if (!q) | |
1da177e4 LT |
1583 | return -ENOENT; |
1584 | ||
1585 | /* An check that it supports classes */ | |
1586 | cops = q->ops->cl_ops; | |
1587 | if (cops == NULL) | |
1588 | return -EINVAL; | |
1589 | ||
1590 | /* Now try to get class */ | |
1591 | if (clid == 0) { | |
15e47304 | 1592 | if (portid == TC_H_ROOT) |
1da177e4 LT |
1593 | clid = qid; |
1594 | } else | |
1595 | clid = TC_H_MAKE(qid, clid); | |
1596 | ||
1597 | if (clid) | |
1598 | cl = cops->get(q, clid); | |
1599 | ||
1600 | if (cl == 0) { | |
1601 | err = -ENOENT; | |
cc7ec456 ED |
1602 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1603 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1604 | goto out; |
1605 | } else { | |
1606 | switch (n->nlmsg_type) { | |
10297b99 | 1607 | case RTM_NEWTCLASS: |
1da177e4 | 1608 | err = -EEXIST; |
cc7ec456 | 1609 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1610 | goto out; |
1611 | break; | |
1612 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1613 | err = -EOPNOTSUPP; |
1614 | if (cops->delete) | |
1615 | err = cops->delete(q, cl); | |
1da177e4 | 1616 | if (err == 0) |
7316ae88 | 1617 | tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); |
1da177e4 LT |
1618 | goto out; |
1619 | case RTM_GETTCLASS: | |
7316ae88 | 1620 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1621 | goto out; |
1622 | default: | |
1623 | err = -EINVAL; | |
1624 | goto out; | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | new_cl = cl; | |
de6d5cdf PM |
1629 | err = -EOPNOTSUPP; |
1630 | if (cops->change) | |
15e47304 | 1631 | err = cops->change(q, clid, portid, tca, &new_cl); |
1da177e4 | 1632 | if (err == 0) |
7316ae88 | 1633 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1634 | |
1635 | out: | |
1636 | if (cl) | |
1637 | cops->put(q, cl); | |
1638 | ||
1639 | return err; | |
1640 | } | |
1641 | ||
1642 | ||
1643 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1644 | unsigned long cl, | |
15e47304 | 1645 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1646 | { |
1647 | struct tcmsg *tcm; | |
1648 | struct nlmsghdr *nlh; | |
27a884dc | 1649 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1650 | struct gnet_dump d; |
20fea08b | 1651 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1652 | |
fba373d2 | 1653 | cond_resched(); |
15e47304 | 1654 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1655 | if (!nlh) |
1656 | goto out_nlmsg_trim; | |
1657 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1658 | tcm->tcm_family = AF_UNSPEC; |
16ebb5e0 ED |
1659 | tcm->tcm__pad1 = 0; |
1660 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1661 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1662 | tcm->tcm_parent = q->handle; |
1663 | tcm->tcm_handle = q->handle; | |
1664 | tcm->tcm_info = 0; | |
1b34ec43 DM |
1665 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1666 | goto nla_put_failure; | |
1da177e4 | 1667 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1668 | goto nla_put_failure; |
1da177e4 | 1669 | |
102396ae JP |
1670 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1671 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1672 | goto nla_put_failure; |
1da177e4 LT |
1673 | |
1674 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1675 | goto nla_put_failure; |
1da177e4 LT |
1676 | |
1677 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1678 | goto nla_put_failure; |
1da177e4 | 1679 | |
27a884dc | 1680 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1681 | return skb->len; |
1682 | ||
02ef22ca | 1683 | out_nlmsg_trim: |
1e90474c | 1684 | nla_put_failure: |
dc5fc579 | 1685 | nlmsg_trim(skb, b); |
1da177e4 LT |
1686 | return -1; |
1687 | } | |
1688 | ||
7316ae88 TG |
1689 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1690 | struct nlmsghdr *n, struct Qdisc *q, | |
1691 | unsigned long cl, int event) | |
1da177e4 LT |
1692 | { |
1693 | struct sk_buff *skb; | |
15e47304 | 1694 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1695 | |
1696 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1697 | if (!skb) | |
1698 | return -ENOBUFS; | |
1699 | ||
15e47304 | 1700 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { |
1da177e4 LT |
1701 | kfree_skb(skb); |
1702 | return -EINVAL; | |
1703 | } | |
1704 | ||
15e47304 | 1705 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1706 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1707 | } |
1708 | ||
cc7ec456 ED |
1709 | struct qdisc_dump_args { |
1710 | struct qdisc_walker w; | |
1711 | struct sk_buff *skb; | |
1712 | struct netlink_callback *cb; | |
1da177e4 LT |
1713 | }; |
1714 | ||
1715 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1716 | { | |
1717 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1718 | ||
15e47304 | 1719 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
1da177e4 LT |
1720 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); |
1721 | } | |
1722 | ||
30723673 DM |
1723 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1724 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1725 | int *t_p, int s_t) | |
1726 | { | |
1727 | struct qdisc_dump_args arg; | |
1728 | ||
1729 | if (tc_qdisc_dump_ignore(q) || | |
1730 | *t_p < s_t || !q->ops->cl_ops || | |
1731 | (tcm->tcm_parent && | |
1732 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1733 | (*t_p)++; | |
1734 | return 0; | |
1735 | } | |
1736 | if (*t_p > s_t) | |
1737 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1738 | arg.w.fn = qdisc_class_dump; | |
1739 | arg.skb = skb; | |
1740 | arg.cb = cb; | |
1741 | arg.w.stop = 0; | |
1742 | arg.w.skip = cb->args[1]; | |
1743 | arg.w.count = 0; | |
1744 | q->ops->cl_ops->walk(q, &arg.w); | |
1745 | cb->args[1] = arg.w.count; | |
1746 | if (arg.w.stop) | |
1747 | return -1; | |
1748 | (*t_p)++; | |
1749 | return 0; | |
1750 | } | |
1751 | ||
1752 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1753 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1754 | int *t_p, int s_t) | |
1755 | { | |
1756 | struct Qdisc *q; | |
1757 | ||
1758 | if (!root) | |
1759 | return 0; | |
1760 | ||
1761 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1762 | return -1; | |
1763 | ||
1764 | list_for_each_entry(q, &root->list, list) { | |
1765 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1766 | return -1; | |
1767 | } | |
1768 | ||
1769 | return 0; | |
1770 | } | |
1771 | ||
1da177e4 LT |
1772 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1773 | { | |
02ef22ca | 1774 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 1775 | struct net *net = sock_net(skb->sk); |
30723673 | 1776 | struct netdev_queue *dev_queue; |
1da177e4 | 1777 | struct net_device *dev; |
30723673 | 1778 | int t, s_t; |
1da177e4 | 1779 | |
573ce260 | 1780 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1781 | return 0; |
cc7ec456 ED |
1782 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
1783 | if (!dev) | |
1da177e4 LT |
1784 | return 0; |
1785 | ||
1786 | s_t = cb->args[0]; | |
1787 | t = 0; | |
1788 | ||
af356afa | 1789 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1790 | goto done; |
1791 | ||
24824a09 ED |
1792 | dev_queue = dev_ingress_queue(dev); |
1793 | if (dev_queue && | |
1794 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
1795 | &t, s_t) < 0) | |
30723673 | 1796 | goto done; |
1da177e4 | 1797 | |
30723673 | 1798 | done: |
1da177e4 LT |
1799 | cb->args[0] = t; |
1800 | ||
1801 | dev_put(dev); | |
1802 | return skb->len; | |
1803 | } | |
1804 | ||
1805 | /* Main classifier routine: scans classifier chain attached | |
cc7ec456 ED |
1806 | * to this qdisc, (optionally) tests for protocol and asks |
1807 | * specific classifiers. | |
1da177e4 | 1808 | */ |
3b3ae880 DB |
1809 | int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1810 | struct tcf_result *res, bool compat_mode) | |
73ca4918 | 1811 | { |
d8b9605d | 1812 | __be16 protocol = tc_skb_protocol(skb); |
3b3ae880 DB |
1813 | #ifdef CONFIG_NET_CLS_ACT |
1814 | const struct tcf_proto *old_tp = tp; | |
1815 | int limit = 0; | |
73ca4918 | 1816 | |
3b3ae880 DB |
1817 | reclassify: |
1818 | #endif | |
25d8c0d5 | 1819 | for (; tp; tp = rcu_dereference_bh(tp->next)) { |
3b3ae880 DB |
1820 | int err; |
1821 | ||
cc7ec456 ED |
1822 | if (tp->protocol != protocol && |
1823 | tp->protocol != htons(ETH_P_ALL)) | |
1824 | continue; | |
cc7ec456 | 1825 | |
3b3ae880 DB |
1826 | err = tp->classify(skb, tp, res); |
1827 | #ifdef CONFIG_NET_CLS_ACT | |
c1b3b199 | 1828 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) |
3b3ae880 DB |
1829 | goto reset; |
1830 | #endif | |
e578d9c0 | 1831 | if (err >= 0) |
73ca4918 | 1832 | return err; |
73ca4918 | 1833 | } |
73ca4918 | 1834 | |
3b3ae880 | 1835 | return -1; |
1da177e4 | 1836 | #ifdef CONFIG_NET_CLS_ACT |
3b3ae880 DB |
1837 | reset: |
1838 | if (unlikely(limit++ >= MAX_REC_LOOP)) { | |
c1b3b199 DB |
1839 | net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", |
1840 | tp->q->ops->id, tp->prio & 0xffff, | |
1841 | ntohs(tp->protocol)); | |
3b3ae880 | 1842 | return TC_ACT_SHOT; |
1da177e4 | 1843 | } |
3b3ae880 DB |
1844 | |
1845 | tp = old_tp; | |
1846 | goto reclassify; | |
73ca4918 | 1847 | #endif |
1da177e4 | 1848 | } |
73ca4918 | 1849 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1850 | |
1e052be6 | 1851 | bool tcf_destroy(struct tcf_proto *tp, bool force) |
a48b5a61 | 1852 | { |
1e052be6 CW |
1853 | if (tp->ops->destroy(tp, force)) { |
1854 | module_put(tp->ops->owner); | |
1855 | kfree_rcu(tp, rcu); | |
1856 | return true; | |
1857 | } | |
1858 | ||
1859 | return false; | |
a48b5a61 PM |
1860 | } |
1861 | ||
25d8c0d5 | 1862 | void tcf_destroy_chain(struct tcf_proto __rcu **fl) |
a48b5a61 PM |
1863 | { |
1864 | struct tcf_proto *tp; | |
1865 | ||
25d8c0d5 JF |
1866 | while ((tp = rtnl_dereference(*fl)) != NULL) { |
1867 | RCU_INIT_POINTER(*fl, tp->next); | |
1e052be6 | 1868 | tcf_destroy(tp, true); |
a48b5a61 PM |
1869 | } |
1870 | } | |
1871 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1872 | ||
1da177e4 LT |
1873 | #ifdef CONFIG_PROC_FS |
1874 | static int psched_show(struct seq_file *seq, void *v) | |
1875 | { | |
1876 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 1877 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1878 | 1000000, |
1e317688 | 1879 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
1880 | |
1881 | return 0; | |
1882 | } | |
1883 | ||
1884 | static int psched_open(struct inode *inode, struct file *file) | |
1885 | { | |
7e5ab157 | 1886 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1887 | } |
1888 | ||
da7071d7 | 1889 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1890 | .owner = THIS_MODULE, |
1891 | .open = psched_open, | |
1892 | .read = seq_read, | |
1893 | .llseek = seq_lseek, | |
1894 | .release = single_release, | |
10297b99 | 1895 | }; |
7316ae88 TG |
1896 | |
1897 | static int __net_init psched_net_init(struct net *net) | |
1898 | { | |
1899 | struct proc_dir_entry *e; | |
1900 | ||
d4beaa66 | 1901 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
7316ae88 TG |
1902 | if (e == NULL) |
1903 | return -ENOMEM; | |
1904 | ||
1905 | return 0; | |
1906 | } | |
1907 | ||
1908 | static void __net_exit psched_net_exit(struct net *net) | |
1909 | { | |
ece31ffd | 1910 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
1911 | } |
1912 | #else | |
1913 | static int __net_init psched_net_init(struct net *net) | |
1914 | { | |
1915 | return 0; | |
1916 | } | |
1917 | ||
1918 | static void __net_exit psched_net_exit(struct net *net) | |
1919 | { | |
1920 | } | |
1da177e4 LT |
1921 | #endif |
1922 | ||
7316ae88 TG |
1923 | static struct pernet_operations psched_net_ops = { |
1924 | .init = psched_net_init, | |
1925 | .exit = psched_net_exit, | |
1926 | }; | |
1927 | ||
1da177e4 LT |
1928 | static int __init pktsched_init(void) |
1929 | { | |
7316ae88 TG |
1930 | int err; |
1931 | ||
1932 | err = register_pernet_subsys(&psched_net_ops); | |
1933 | if (err) { | |
cc7ec456 | 1934 | pr_err("pktsched_init: " |
7316ae88 TG |
1935 | "cannot initialize per netns operations\n"); |
1936 | return err; | |
1937 | } | |
1938 | ||
6da7c8fc | 1939 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
1940 | register_qdisc(&pfifo_qdisc_ops); |
1941 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1942 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1943 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 1944 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 1945 | |
c7ac8679 GR |
1946 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL); |
1947 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL); | |
1948 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL); | |
1949 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL); | |
1950 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL); | |
1951 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL); | |
be577ddc | 1952 | |
1da177e4 LT |
1953 | return 0; |
1954 | } | |
1955 | ||
1956 | subsys_initcall(pktsched_init); |