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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 | |
1da177e4 LT |
98 | |
99 | Auxiliary routines: | |
100 | ||
99c0db26 JP |
101 | ---peek |
102 | ||
103 | like dequeue but without removing a packet from the queue | |
104 | ||
1da177e4 LT |
105 | ---reset |
106 | ||
107 | returns qdisc to initial state: purge all buffers, clear all | |
108 | timers, counters (except for statistics) etc. | |
109 | ||
110 | ---init | |
111 | ||
112 | initializes newly created qdisc. | |
113 | ||
114 | ---destroy | |
115 | ||
116 | destroys resources allocated by init and during lifetime of qdisc. | |
117 | ||
118 | ---change | |
119 | ||
120 | changes qdisc parameters. | |
121 | */ | |
122 | ||
123 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
124 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
125 | ||
126 | ||
127 | /************************************************ | |
128 | * Queueing disciplines manipulation. * | |
129 | ************************************************/ | |
130 | ||
131 | ||
132 | /* The list of all installed queueing disciplines. */ | |
133 | ||
134 | static struct Qdisc_ops *qdisc_base; | |
135 | ||
21eb2189 | 136 | /* Register/unregister queueing discipline */ |
1da177e4 LT |
137 | |
138 | int register_qdisc(struct Qdisc_ops *qops) | |
139 | { | |
140 | struct Qdisc_ops *q, **qp; | |
141 | int rc = -EEXIST; | |
142 | ||
143 | write_lock(&qdisc_mod_lock); | |
144 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
145 | if (!strcmp(qops->id, q->id)) | |
146 | goto out; | |
147 | ||
148 | if (qops->enqueue == NULL) | |
149 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 | 150 | if (qops->peek == NULL) { |
68fd26b5 | 151 | if (qops->dequeue == NULL) |
99c0db26 | 152 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
153 | else |
154 | goto out_einval; | |
99c0db26 | 155 | } |
1da177e4 LT |
156 | if (qops->dequeue == NULL) |
157 | qops->dequeue = noop_qdisc_ops.dequeue; | |
158 | ||
68fd26b5 JP |
159 | if (qops->cl_ops) { |
160 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
161 | ||
3e9e5a59 | 162 | if (!(cops->get && cops->put && cops->walk && cops->leaf)) |
68fd26b5 JP |
163 | goto out_einval; |
164 | ||
165 | if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf)) | |
166 | goto out_einval; | |
167 | } | |
168 | ||
1da177e4 LT |
169 | qops->next = NULL; |
170 | *qp = qops; | |
171 | rc = 0; | |
172 | out: | |
173 | write_unlock(&qdisc_mod_lock); | |
174 | return rc; | |
68fd26b5 JP |
175 | |
176 | out_einval: | |
177 | rc = -EINVAL; | |
178 | goto out; | |
1da177e4 | 179 | } |
62e3ba1b | 180 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
181 | |
182 | int unregister_qdisc(struct Qdisc_ops *qops) | |
183 | { | |
184 | struct Qdisc_ops *q, **qp; | |
185 | int err = -ENOENT; | |
186 | ||
187 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 188 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
189 | if (q == qops) |
190 | break; | |
191 | if (q) { | |
192 | *qp = q->next; | |
193 | q->next = NULL; | |
194 | err = 0; | |
195 | } | |
196 | write_unlock(&qdisc_mod_lock); | |
197 | return err; | |
198 | } | |
62e3ba1b | 199 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 | 200 | |
6da7c8fc | 201 | /* Get default qdisc if not otherwise specified */ |
202 | void qdisc_get_default(char *name, size_t len) | |
203 | { | |
204 | read_lock(&qdisc_mod_lock); | |
205 | strlcpy(name, default_qdisc_ops->id, len); | |
206 | read_unlock(&qdisc_mod_lock); | |
207 | } | |
208 | ||
209 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) | |
210 | { | |
211 | struct Qdisc_ops *q = NULL; | |
212 | ||
213 | for (q = qdisc_base; q; q = q->next) { | |
214 | if (!strcmp(name, q->id)) { | |
215 | if (!try_module_get(q->owner)) | |
216 | q = NULL; | |
217 | break; | |
218 | } | |
219 | } | |
220 | ||
221 | return q; | |
222 | } | |
223 | ||
224 | /* Set new default qdisc to use */ | |
225 | int qdisc_set_default(const char *name) | |
226 | { | |
227 | const struct Qdisc_ops *ops; | |
228 | ||
229 | if (!capable(CAP_NET_ADMIN)) | |
230 | return -EPERM; | |
231 | ||
232 | write_lock(&qdisc_mod_lock); | |
233 | ops = qdisc_lookup_default(name); | |
234 | if (!ops) { | |
235 | /* Not found, drop lock and try to load module */ | |
236 | write_unlock(&qdisc_mod_lock); | |
237 | request_module("sch_%s", name); | |
238 | write_lock(&qdisc_mod_lock); | |
239 | ||
240 | ops = qdisc_lookup_default(name); | |
241 | } | |
242 | ||
243 | if (ops) { | |
244 | /* Set new default */ | |
245 | module_put(default_qdisc_ops->owner); | |
246 | default_qdisc_ops = ops; | |
247 | } | |
248 | write_unlock(&qdisc_mod_lock); | |
249 | ||
250 | return ops ? 0 : -ENOENT; | |
251 | } | |
252 | ||
1da177e4 | 253 | /* We know handle. Find qdisc among all qdisc's attached to device |
4eaf3b84 ED |
254 | * (root qdisc, all its children, children of children etc.) |
255 | * Note: caller either uses rtnl or rcu_read_lock() | |
1da177e4 LT |
256 | */ |
257 | ||
6113b748 | 258 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
259 | { |
260 | struct Qdisc *q; | |
261 | ||
262 | if (!(root->flags & TCQ_F_BUILTIN) && | |
263 | root->handle == handle) | |
264 | return root; | |
265 | ||
4eaf3b84 | 266 | list_for_each_entry_rcu(q, &root->list, list) { |
8123b421 DM |
267 | if (q->handle == handle) |
268 | return q; | |
269 | } | |
270 | return NULL; | |
271 | } | |
272 | ||
95dc1929 | 273 | void qdisc_list_add(struct Qdisc *q) |
f6e0b239 | 274 | { |
37314363 ED |
275 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
276 | struct Qdisc *root = qdisc_dev(q)->qdisc; | |
e57a784d | 277 | |
37314363 | 278 | WARN_ON_ONCE(root == &noop_qdisc); |
4eaf3b84 ED |
279 | ASSERT_RTNL(); |
280 | list_add_tail_rcu(&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 | { | |
4eaf3b84 ED |
287 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
288 | ASSERT_RTNL(); | |
289 | list_del_rcu(&q->list); | |
290 | } | |
f6e0b239 JP |
291 | } |
292 | EXPORT_SYMBOL(qdisc_list_del); | |
293 | ||
ead81cc5 | 294 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 295 | { |
f6e0b239 JP |
296 | struct Qdisc *q; |
297 | ||
af356afa PM |
298 | q = qdisc_match_from_root(dev->qdisc, handle); |
299 | if (q) | |
300 | goto out; | |
f6e0b239 | 301 | |
24824a09 ED |
302 | if (dev_ingress_queue(dev)) |
303 | q = qdisc_match_from_root( | |
304 | dev_ingress_queue(dev)->qdisc_sleeping, | |
305 | handle); | |
f6486d40 | 306 | out: |
f6e0b239 | 307 | return q; |
1da177e4 LT |
308 | } |
309 | ||
310 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
311 | { | |
312 | unsigned long cl; | |
313 | struct Qdisc *leaf; | |
20fea08b | 314 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
315 | |
316 | if (cops == NULL) | |
317 | return NULL; | |
318 | cl = cops->get(p, classid); | |
319 | ||
320 | if (cl == 0) | |
321 | return NULL; | |
322 | leaf = cops->leaf(p, cl); | |
323 | cops->put(p, cl); | |
324 | return leaf; | |
325 | } | |
326 | ||
327 | /* Find queueing discipline by name */ | |
328 | ||
1e90474c | 329 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
330 | { |
331 | struct Qdisc_ops *q = NULL; | |
332 | ||
333 | if (kind) { | |
334 | read_lock(&qdisc_mod_lock); | |
335 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 336 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
337 | if (!try_module_get(q->owner)) |
338 | q = NULL; | |
339 | break; | |
340 | } | |
341 | } | |
342 | read_unlock(&qdisc_mod_lock); | |
343 | } | |
344 | return q; | |
345 | } | |
346 | ||
8a8e3d84 JDB |
347 | /* The linklayer setting were not transferred from iproute2, in older |
348 | * versions, and the rate tables lookup systems have been dropped in | |
349 | * the kernel. To keep backward compatible with older iproute2 tc | |
350 | * utils, we detect the linklayer setting by detecting if the rate | |
351 | * table were modified. | |
352 | * | |
353 | * For linklayer ATM table entries, the rate table will be aligned to | |
354 | * 48 bytes, thus some table entries will contain the same value. The | |
355 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
356 | * starting from the mpu, we find low and high table entries for | |
357 | * mapping this cell. If these entries contain the same value, when | |
358 | * the rate tables have been modified for linklayer ATM. | |
359 | * | |
360 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
361 | * and then roundup to the next cell, calc the table entry one below, | |
362 | * and compare. | |
363 | */ | |
364 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
365 | { | |
366 | int low = roundup(r->mpu, 48); | |
367 | int high = roundup(low+1, 48); | |
368 | int cell_low = low >> r->cell_log; | |
369 | int cell_high = (high >> r->cell_log) - 1; | |
370 | ||
371 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
372 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
373 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
374 | return TC_LINKLAYER_ETHERNET; | |
375 | } | |
376 | ||
377 | if ((cell_high > cell_low) && (cell_high < 256) | |
378 | && (rtab[cell_low] == rtab[cell_high])) { | |
379 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
380 | cell_low, cell_high, rtab[cell_high]); | |
381 | return TC_LINKLAYER_ATM; | |
382 | } | |
383 | return TC_LINKLAYER_ETHERNET; | |
384 | } | |
385 | ||
1da177e4 LT |
386 | static struct qdisc_rate_table *qdisc_rtab_list; |
387 | ||
1e90474c | 388 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
389 | { |
390 | struct qdisc_rate_table *rtab; | |
391 | ||
40edeff6 ED |
392 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
393 | nla_len(tab) != TC_RTAB_SIZE) | |
394 | return NULL; | |
395 | ||
1da177e4 | 396 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
397 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
398 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
399 | rtab->refcnt++; |
400 | return rtab; | |
401 | } | |
402 | } | |
403 | ||
1da177e4 LT |
404 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
405 | if (rtab) { | |
406 | rtab->rate = *r; | |
407 | rtab->refcnt = 1; | |
1e90474c | 408 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
409 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
410 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
411 | rtab->next = qdisc_rtab_list; |
412 | qdisc_rtab_list = rtab; | |
413 | } | |
414 | return rtab; | |
415 | } | |
62e3ba1b | 416 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
417 | |
418 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
419 | { | |
420 | struct qdisc_rate_table *rtab, **rtabp; | |
421 | ||
422 | if (!tab || --tab->refcnt) | |
423 | return; | |
424 | ||
cc7ec456 ED |
425 | for (rtabp = &qdisc_rtab_list; |
426 | (rtab = *rtabp) != NULL; | |
427 | rtabp = &rtab->next) { | |
1da177e4 LT |
428 | if (rtab == tab) { |
429 | *rtabp = rtab->next; | |
430 | kfree(rtab); | |
431 | return; | |
432 | } | |
433 | } | |
434 | } | |
62e3ba1b | 435 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 436 | |
175f9c1b JK |
437 | static LIST_HEAD(qdisc_stab_list); |
438 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
439 | ||
440 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
441 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
442 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
443 | }; | |
444 | ||
445 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
446 | { | |
447 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
448 | struct qdisc_size_table *stab; | |
449 | struct tc_sizespec *s; | |
450 | unsigned int tsize = 0; | |
451 | u16 *tab = NULL; | |
452 | int err; | |
453 | ||
454 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
455 | if (err < 0) | |
456 | return ERR_PTR(err); | |
457 | if (!tb[TCA_STAB_BASE]) | |
458 | return ERR_PTR(-EINVAL); | |
459 | ||
460 | s = nla_data(tb[TCA_STAB_BASE]); | |
461 | ||
462 | if (s->tsize > 0) { | |
463 | if (!tb[TCA_STAB_DATA]) | |
464 | return ERR_PTR(-EINVAL); | |
465 | tab = nla_data(tb[TCA_STAB_DATA]); | |
466 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
467 | } | |
468 | ||
00093fab | 469 | if (tsize != s->tsize || (!tab && tsize > 0)) |
175f9c1b JK |
470 | return ERR_PTR(-EINVAL); |
471 | ||
f3b9605d | 472 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
473 | |
474 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
475 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
476 | continue; | |
477 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
478 | continue; | |
479 | stab->refcnt++; | |
f3b9605d | 480 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
481 | return stab; |
482 | } | |
483 | ||
f3b9605d | 484 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
485 | |
486 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
487 | if (!stab) | |
488 | return ERR_PTR(-ENOMEM); | |
489 | ||
490 | stab->refcnt = 1; | |
491 | stab->szopts = *s; | |
492 | if (tsize > 0) | |
493 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
494 | ||
f3b9605d | 495 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 496 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 497 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
498 | |
499 | return stab; | |
500 | } | |
501 | ||
a2da570d ED |
502 | static void stab_kfree_rcu(struct rcu_head *head) |
503 | { | |
504 | kfree(container_of(head, struct qdisc_size_table, rcu)); | |
505 | } | |
506 | ||
175f9c1b JK |
507 | void qdisc_put_stab(struct qdisc_size_table *tab) |
508 | { | |
509 | if (!tab) | |
510 | return; | |
511 | ||
f3b9605d | 512 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
513 | |
514 | if (--tab->refcnt == 0) { | |
515 | list_del(&tab->list); | |
a2da570d | 516 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
175f9c1b JK |
517 | } |
518 | ||
f3b9605d | 519 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
520 | } |
521 | EXPORT_SYMBOL(qdisc_put_stab); | |
522 | ||
523 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
524 | { | |
525 | struct nlattr *nest; | |
526 | ||
527 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
528 | if (nest == NULL) |
529 | goto nla_put_failure; | |
1b34ec43 DM |
530 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
531 | goto nla_put_failure; | |
175f9c1b JK |
532 | nla_nest_end(skb, nest); |
533 | ||
534 | return skb->len; | |
535 | ||
536 | nla_put_failure: | |
537 | return -1; | |
538 | } | |
539 | ||
a2da570d | 540 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab) |
175f9c1b JK |
541 | { |
542 | int pkt_len, slot; | |
543 | ||
544 | pkt_len = skb->len + stab->szopts.overhead; | |
545 | if (unlikely(!stab->szopts.tsize)) | |
546 | goto out; | |
547 | ||
548 | slot = pkt_len + stab->szopts.cell_align; | |
549 | if (unlikely(slot < 0)) | |
550 | slot = 0; | |
551 | ||
552 | slot >>= stab->szopts.cell_log; | |
553 | if (likely(slot < stab->szopts.tsize)) | |
554 | pkt_len = stab->data[slot]; | |
555 | else | |
556 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
557 | (slot / stab->szopts.tsize) + | |
558 | stab->data[slot % stab->szopts.tsize]; | |
559 | ||
560 | pkt_len <<= stab->szopts.size_log; | |
561 | out: | |
562 | if (unlikely(pkt_len < 1)) | |
563 | pkt_len = 1; | |
564 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
565 | } | |
a2da570d | 566 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 567 | |
6e765a00 | 568 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
569 | { |
570 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
571 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
572 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
573 | qdisc->flags |= TCQ_F_WARN_NONWC; |
574 | } | |
575 | } | |
576 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
577 | ||
4179477f PM |
578 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
579 | { | |
580 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 581 | timer); |
4179477f | 582 | |
1e203c1a | 583 | rcu_read_lock(); |
8608db03 | 584 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 585 | rcu_read_unlock(); |
1936502d | 586 | |
4179477f PM |
587 | return HRTIMER_NORESTART; |
588 | } | |
589 | ||
590 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
591 | { | |
4a8e320c | 592 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 593 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
594 | wd->qdisc = qdisc; |
595 | } | |
596 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
597 | ||
45f50bed | 598 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires) |
4179477f | 599 | { |
2540e051 JP |
600 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
601 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
602 | return; | |
603 | ||
a9efad8b ED |
604 | if (wd->last_expires == expires) |
605 | return; | |
606 | ||
607 | wd->last_expires = expires; | |
46baac38 | 608 | hrtimer_start(&wd->timer, |
34c5d292 | 609 | ns_to_ktime(expires), |
4a8e320c | 610 | HRTIMER_MODE_ABS_PINNED); |
4179477f | 611 | } |
34c5d292 | 612 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
4179477f PM |
613 | |
614 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
615 | { | |
2fbd3da3 | 616 | hrtimer_cancel(&wd->timer); |
4179477f PM |
617 | } |
618 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 619 | |
a94f779f | 620 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
621 | { |
622 | unsigned int size = n * sizeof(struct hlist_head), i; | |
623 | struct hlist_head *h; | |
624 | ||
625 | if (size <= PAGE_SIZE) | |
626 | h = kmalloc(size, GFP_KERNEL); | |
627 | else | |
628 | h = (struct hlist_head *) | |
629 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
630 | ||
631 | if (h != NULL) { | |
632 | for (i = 0; i < n; i++) | |
633 | INIT_HLIST_HEAD(&h[i]); | |
634 | } | |
635 | return h; | |
636 | } | |
637 | ||
638 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
639 | { | |
640 | unsigned int size = n * sizeof(struct hlist_head); | |
641 | ||
642 | if (size <= PAGE_SIZE) | |
643 | kfree(h); | |
644 | else | |
645 | free_pages((unsigned long)h, get_order(size)); | |
646 | } | |
647 | ||
648 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
649 | { | |
650 | struct Qdisc_class_common *cl; | |
b67bfe0d | 651 | struct hlist_node *next; |
6fe1c7a5 PM |
652 | struct hlist_head *nhash, *ohash; |
653 | unsigned int nsize, nmask, osize; | |
654 | unsigned int i, h; | |
655 | ||
656 | /* Rehash when load factor exceeds 0.75 */ | |
657 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
658 | return; | |
659 | nsize = clhash->hashsize * 2; | |
660 | nmask = nsize - 1; | |
661 | nhash = qdisc_class_hash_alloc(nsize); | |
662 | if (nhash == NULL) | |
663 | return; | |
664 | ||
665 | ohash = clhash->hash; | |
666 | osize = clhash->hashsize; | |
667 | ||
668 | sch_tree_lock(sch); | |
669 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 670 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
671 | h = qdisc_class_hash(cl->classid, nmask); |
672 | hlist_add_head(&cl->hnode, &nhash[h]); | |
673 | } | |
674 | } | |
675 | clhash->hash = nhash; | |
676 | clhash->hashsize = nsize; | |
677 | clhash->hashmask = nmask; | |
678 | sch_tree_unlock(sch); | |
679 | ||
680 | qdisc_class_hash_free(ohash, osize); | |
681 | } | |
682 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
683 | ||
684 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
685 | { | |
686 | unsigned int size = 4; | |
687 | ||
688 | clhash->hash = qdisc_class_hash_alloc(size); | |
689 | if (clhash->hash == NULL) | |
690 | return -ENOMEM; | |
691 | clhash->hashsize = size; | |
692 | clhash->hashmask = size - 1; | |
693 | clhash->hashelems = 0; | |
694 | return 0; | |
695 | } | |
696 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
697 | ||
698 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
699 | { | |
700 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
701 | } | |
702 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
703 | ||
704 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
705 | struct Qdisc_class_common *cl) | |
706 | { | |
707 | unsigned int h; | |
708 | ||
709 | INIT_HLIST_NODE(&cl->hnode); | |
710 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
711 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
712 | clhash->hashelems++; | |
713 | } | |
714 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
715 | ||
716 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
717 | struct Qdisc_class_common *cl) | |
718 | { | |
719 | hlist_del(&cl->hnode); | |
720 | clhash->hashelems--; | |
721 | } | |
722 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
723 | ||
fa0f5aa7 ED |
724 | /* Allocate an unique handle from space managed by kernel |
725 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
726 | */ | |
1da177e4 LT |
727 | static u32 qdisc_alloc_handle(struct net_device *dev) |
728 | { | |
fa0f5aa7 | 729 | int i = 0x8000; |
1da177e4 LT |
730 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
731 | ||
732 | do { | |
733 | autohandle += TC_H_MAKE(0x10000U, 0); | |
734 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
735 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
736 | if (!qdisc_lookup(dev, autohandle)) |
737 | return autohandle; | |
738 | cond_resched(); | |
739 | } while (--i > 0); | |
1da177e4 | 740 | |
fa0f5aa7 | 741 | return 0; |
1da177e4 LT |
742 | } |
743 | ||
2ccccf5f WC |
744 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, unsigned int n, |
745 | unsigned int len) | |
43effa1e | 746 | { |
20fea08b | 747 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
748 | unsigned long cl; |
749 | u32 parentid; | |
2c8c8e6f | 750 | int drops; |
43effa1e | 751 | |
2ccccf5f | 752 | if (n == 0 && len == 0) |
43effa1e | 753 | return; |
2c8c8e6f | 754 | drops = max_t(int, n, 0); |
4eaf3b84 | 755 | rcu_read_lock(); |
43effa1e | 756 | while ((parentid = sch->parent)) { |
066a3b5b | 757 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 758 | break; |
066a3b5b | 759 | |
4eaf3b84 ED |
760 | if (sch->flags & TCQ_F_NOPARENT) |
761 | break; | |
762 | /* TODO: perform the search on a per txq basis */ | |
5ce2d488 | 763 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 764 | if (sch == NULL) { |
4eaf3b84 ED |
765 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
766 | break; | |
ffc8fefa | 767 | } |
43effa1e PM |
768 | cops = sch->ops->cl_ops; |
769 | if (cops->qlen_notify) { | |
770 | cl = cops->get(sch, parentid); | |
771 | cops->qlen_notify(sch, cl); | |
772 | cops->put(sch, cl); | |
773 | } | |
774 | sch->q.qlen -= n; | |
2ccccf5f | 775 | sch->qstats.backlog -= len; |
25331d6c | 776 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 777 | } |
4eaf3b84 | 778 | rcu_read_unlock(); |
43effa1e | 779 | } |
2ccccf5f | 780 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
1da177e4 | 781 | |
7316ae88 TG |
782 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
783 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
784 | struct Qdisc *old, struct Qdisc *new) |
785 | { | |
786 | if (new || old) | |
7316ae88 | 787 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 788 | |
4d8863a2 | 789 | if (old) |
99194cff | 790 | qdisc_destroy(old); |
99194cff DM |
791 | } |
792 | ||
793 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
794 | * to device "dev". | |
795 | * | |
796 | * When appropriate send a netlink notification using 'skb' | |
797 | * and "n". | |
798 | * | |
799 | * On success, destroy old qdisc. | |
1da177e4 LT |
800 | */ |
801 | ||
802 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
803 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
804 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 805 | { |
99194cff | 806 | struct Qdisc *q = old; |
7316ae88 | 807 | struct net *net = dev_net(dev); |
1da177e4 | 808 | int err = 0; |
1da177e4 | 809 | |
10297b99 | 810 | if (parent == NULL) { |
99194cff DM |
811 | unsigned int i, num_q, ingress; |
812 | ||
813 | ingress = 0; | |
814 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
815 | if ((q && q->flags & TCQ_F_INGRESS) || |
816 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
817 | num_q = 1; |
818 | ingress = 1; | |
24824a09 ED |
819 | if (!dev_ingress_queue(dev)) |
820 | return -ENOENT; | |
99194cff DM |
821 | } |
822 | ||
823 | if (dev->flags & IFF_UP) | |
824 | dev_deactivate(dev); | |
825 | ||
86e363dc WC |
826 | if (new && new->ops->attach) |
827 | goto skip; | |
6ec1c69a | 828 | |
99194cff | 829 | for (i = 0; i < num_q; i++) { |
24824a09 | 830 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
831 | |
832 | if (!ingress) | |
833 | dev_queue = netdev_get_tx_queue(dev, i); | |
834 | ||
8d50b53d DM |
835 | old = dev_graft_qdisc(dev_queue, new); |
836 | if (new && i > 0) | |
837 | atomic_inc(&new->refcnt); | |
838 | ||
036d6a67 JP |
839 | if (!ingress) |
840 | qdisc_destroy(old); | |
1da177e4 | 841 | } |
99194cff | 842 | |
86e363dc | 843 | skip: |
036d6a67 | 844 | if (!ingress) { |
7316ae88 TG |
845 | notify_and_destroy(net, skb, n, classid, |
846 | dev->qdisc, new); | |
036d6a67 JP |
847 | if (new && !new->ops->attach) |
848 | atomic_inc(&new->refcnt); | |
849 | dev->qdisc = new ? : &noop_qdisc; | |
86e363dc WC |
850 | |
851 | if (new && new->ops->attach) | |
852 | new->ops->attach(new); | |
036d6a67 | 853 | } else { |
7316ae88 | 854 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 855 | } |
af356afa | 856 | |
99194cff DM |
857 | if (dev->flags & IFF_UP) |
858 | dev_activate(dev); | |
1da177e4 | 859 | } else { |
20fea08b | 860 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 861 | |
c9f1d038 PM |
862 | err = -EOPNOTSUPP; |
863 | if (cops && cops->graft) { | |
1da177e4 LT |
864 | unsigned long cl = cops->get(parent, classid); |
865 | if (cl) { | |
99194cff | 866 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 867 | cops->put(parent, cl); |
c9f1d038 PM |
868 | } else |
869 | err = -ENOENT; | |
1da177e4 | 870 | } |
99194cff | 871 | if (!err) |
7316ae88 | 872 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
873 | } |
874 | return err; | |
875 | } | |
876 | ||
25bfcd5a JP |
877 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
878 | static struct lock_class_key qdisc_tx_lock; | |
879 | static struct lock_class_key qdisc_rx_lock; | |
880 | ||
1da177e4 LT |
881 | /* |
882 | Allocate and initialize new qdisc. | |
883 | ||
884 | Parameters are passed via opt. | |
885 | */ | |
886 | ||
887 | static struct Qdisc * | |
bb949fbd | 888 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
23bcf634 PM |
889 | struct Qdisc *p, u32 parent, u32 handle, |
890 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
891 | { |
892 | int err; | |
1e90474c | 893 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
894 | struct Qdisc *sch; |
895 | struct Qdisc_ops *ops; | |
175f9c1b | 896 | struct qdisc_size_table *stab; |
1da177e4 LT |
897 | |
898 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 899 | #ifdef CONFIG_MODULES |
1da177e4 LT |
900 | if (ops == NULL && kind != NULL) { |
901 | char name[IFNAMSIZ]; | |
1e90474c | 902 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
903 | /* We dropped the RTNL semaphore in order to |
904 | * perform the module load. So, even if we | |
905 | * succeeded in loading the module we have to | |
906 | * tell the caller to replay the request. We | |
907 | * indicate this using -EAGAIN. | |
908 | * We replay the request because the device may | |
909 | * go away in the mean time. | |
910 | */ | |
911 | rtnl_unlock(); | |
912 | request_module("sch_%s", name); | |
913 | rtnl_lock(); | |
914 | ops = qdisc_lookup_ops(kind); | |
915 | if (ops != NULL) { | |
916 | /* We will try again qdisc_lookup_ops, | |
917 | * so don't keep a reference. | |
918 | */ | |
919 | module_put(ops->owner); | |
920 | err = -EAGAIN; | |
921 | goto err_out; | |
922 | } | |
923 | } | |
924 | } | |
925 | #endif | |
926 | ||
b9e2cc0f | 927 | err = -ENOENT; |
1da177e4 LT |
928 | if (ops == NULL) |
929 | goto err_out; | |
930 | ||
5ce2d488 | 931 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
932 | if (IS_ERR(sch)) { |
933 | err = PTR_ERR(sch); | |
1da177e4 | 934 | goto err_out2; |
3d54b82f | 935 | } |
1da177e4 | 936 | |
ffc8fefa PM |
937 | sch->parent = parent; |
938 | ||
3d54b82f | 939 | if (handle == TC_H_INGRESS) { |
1da177e4 | 940 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 941 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 942 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 943 | } else { |
fd44de7c PM |
944 | if (handle == 0) { |
945 | handle = qdisc_alloc_handle(dev); | |
946 | err = -ENOMEM; | |
947 | if (handle == 0) | |
948 | goto err_out3; | |
949 | } | |
25bfcd5a | 950 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1abbe139 | 951 | if (!netif_is_multiqueue(dev)) |
225734de | 952 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
953 | } |
954 | ||
3d54b82f | 955 | sch->handle = handle; |
1da177e4 | 956 | |
1e90474c | 957 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
22e0f8b9 JF |
958 | if (qdisc_is_percpu_stats(sch)) { |
959 | sch->cpu_bstats = | |
7c1c97d5 | 960 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
22e0f8b9 JF |
961 | if (!sch->cpu_bstats) |
962 | goto err_out4; | |
b0ab6f92 JF |
963 | |
964 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
965 | if (!sch->cpu_qstats) | |
966 | goto err_out4; | |
22e0f8b9 JF |
967 | } |
968 | ||
175f9c1b JK |
969 | if (tca[TCA_STAB]) { |
970 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
971 | if (IS_ERR(stab)) { | |
972 | err = PTR_ERR(stab); | |
7c64b9f3 | 973 | goto err_out4; |
175f9c1b | 974 | } |
a2da570d | 975 | rcu_assign_pointer(sch->stab, stab); |
175f9c1b | 976 | } |
1e90474c | 977 | if (tca[TCA_RATE]) { |
edb09eb1 | 978 | seqcount_t *running; |
f6f9b93f | 979 | |
23bcf634 PM |
980 | err = -EOPNOTSUPP; |
981 | if (sch->flags & TCQ_F_MQROOT) | |
982 | goto err_out4; | |
983 | ||
f6f9b93f | 984 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
985 | !(sch->flags & TCQ_F_INGRESS) && |
986 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
edb09eb1 | 987 | running = qdisc_root_sleeping_running(sch); |
f6f9b93f | 988 | else |
edb09eb1 | 989 | running = &sch->running; |
f6f9b93f | 990 | |
22e0f8b9 JF |
991 | err = gen_new_estimator(&sch->bstats, |
992 | sch->cpu_bstats, | |
993 | &sch->rate_est, | |
edb09eb1 ED |
994 | NULL, |
995 | running, | |
22e0f8b9 | 996 | tca[TCA_RATE]); |
23bcf634 PM |
997 | if (err) |
998 | goto err_out4; | |
023e09a7 | 999 | } |
f6e0b239 JP |
1000 | |
1001 | qdisc_list_add(sch); | |
1da177e4 | 1002 | |
1da177e4 LT |
1003 | return sch; |
1004 | } | |
1005 | err_out3: | |
1006 | dev_put(dev); | |
3d54b82f | 1007 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
1008 | err_out2: |
1009 | module_put(ops->owner); | |
1010 | err_out: | |
1011 | *errp = err; | |
1da177e4 | 1012 | return NULL; |
23bcf634 PM |
1013 | |
1014 | err_out4: | |
22e0f8b9 | 1015 | free_percpu(sch->cpu_bstats); |
b0ab6f92 | 1016 | free_percpu(sch->cpu_qstats); |
23bcf634 PM |
1017 | /* |
1018 | * Any broken qdiscs that would require a ops->reset() here? | |
1019 | * The qdisc was never in action so it shouldn't be necessary. | |
1020 | */ | |
a2da570d | 1021 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1022 | if (ops->destroy) |
1023 | ops->destroy(sch); | |
1024 | goto err_out3; | |
1da177e4 LT |
1025 | } |
1026 | ||
1e90474c | 1027 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 1028 | { |
a2da570d | 1029 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1030 | int err = 0; |
1da177e4 | 1031 | |
175f9c1b | 1032 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
1033 | if (sch->ops->change == NULL) |
1034 | return -EINVAL; | |
1e90474c | 1035 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
1036 | if (err) |
1037 | return err; | |
1038 | } | |
175f9c1b JK |
1039 | |
1040 | if (tca[TCA_STAB]) { | |
1041 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
1042 | if (IS_ERR(stab)) | |
1043 | return PTR_ERR(stab); | |
1044 | } | |
1045 | ||
a2da570d ED |
1046 | ostab = rtnl_dereference(sch->stab); |
1047 | rcu_assign_pointer(sch->stab, stab); | |
1048 | qdisc_put_stab(ostab); | |
175f9c1b | 1049 | |
23bcf634 | 1050 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1051 | /* NB: ignores errors from replace_estimator |
1052 | because change can't be undone. */ | |
23bcf634 PM |
1053 | if (sch->flags & TCQ_F_MQROOT) |
1054 | goto out; | |
22e0f8b9 JF |
1055 | gen_replace_estimator(&sch->bstats, |
1056 | sch->cpu_bstats, | |
1057 | &sch->rate_est, | |
edb09eb1 ED |
1058 | NULL, |
1059 | qdisc_root_sleeping_running(sch), | |
22e0f8b9 | 1060 | tca[TCA_RATE]); |
23bcf634 PM |
1061 | } |
1062 | out: | |
1da177e4 LT |
1063 | return 0; |
1064 | } | |
1065 | ||
cc7ec456 ED |
1066 | struct check_loop_arg { |
1067 | struct qdisc_walker w; | |
1da177e4 LT |
1068 | struct Qdisc *p; |
1069 | int depth; | |
1070 | }; | |
1071 | ||
1072 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
1073 | ||
1074 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1075 | { | |
1076 | struct check_loop_arg arg; | |
1077 | ||
1078 | if (q->ops->cl_ops == NULL) | |
1079 | return 0; | |
1080 | ||
1081 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1082 | arg.w.fn = check_loop_fn; | |
1083 | arg.depth = depth; | |
1084 | arg.p = p; | |
1085 | q->ops->cl_ops->walk(q, &arg.w); | |
1086 | return arg.w.stop ? -ELOOP : 0; | |
1087 | } | |
1088 | ||
1089 | static int | |
1090 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1091 | { | |
1092 | struct Qdisc *leaf; | |
20fea08b | 1093 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1094 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1095 | ||
1096 | leaf = cops->leaf(q, cl); | |
1097 | if (leaf) { | |
1098 | if (leaf == arg->p || arg->depth > 7) | |
1099 | return -ELOOP; | |
1100 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1101 | } | |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Delete/get qdisc. | |
1107 | */ | |
1108 | ||
661d2967 | 1109 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1110 | { |
3b1e0a65 | 1111 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1112 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1113 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1114 | struct net_device *dev; |
de179c8c | 1115 | u32 clid; |
1da177e4 LT |
1116 | struct Qdisc *q = NULL; |
1117 | struct Qdisc *p = NULL; | |
1118 | int err; | |
1119 | ||
4e8bbb81 | 1120 | if ((n->nlmsg_type != RTM_GETQDISC) && |
5f013c9b | 1121 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1122 | return -EPERM; |
1123 | ||
1e90474c PM |
1124 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1125 | if (err < 0) | |
1126 | return err; | |
1127 | ||
de179c8c H |
1128 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1129 | if (!dev) | |
1130 | return -ENODEV; | |
1131 | ||
1132 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1133 | if (clid) { |
1134 | if (clid != TC_H_ROOT) { | |
1135 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 ED |
1136 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1137 | if (!p) | |
1da177e4 LT |
1138 | return -ENOENT; |
1139 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1140 | } else if (dev_ingress_queue(dev)) { |
1141 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1142 | } |
1da177e4 | 1143 | } else { |
af356afa | 1144 | q = dev->qdisc; |
1da177e4 LT |
1145 | } |
1146 | if (!q) | |
1147 | return -ENOENT; | |
1148 | ||
1149 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
1150 | return -EINVAL; | |
1151 | } else { | |
cc7ec456 ED |
1152 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1153 | if (!q) | |
1da177e4 LT |
1154 | return -ENOENT; |
1155 | } | |
1156 | ||
1e90474c | 1157 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1158 | return -EINVAL; |
1159 | ||
1160 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1161 | if (!clid) | |
1162 | return -EINVAL; | |
1163 | if (q->handle == 0) | |
1164 | return -ENOENT; | |
cc7ec456 ED |
1165 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
1166 | if (err != 0) | |
1da177e4 | 1167 | return err; |
1da177e4 | 1168 | } else { |
7316ae88 | 1169 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1170 | } |
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | /* | |
cc7ec456 | 1175 | * Create/change qdisc. |
1da177e4 LT |
1176 | */ |
1177 | ||
661d2967 | 1178 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1179 | { |
3b1e0a65 | 1180 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1181 | struct tcmsg *tcm; |
1e90474c | 1182 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1183 | struct net_device *dev; |
1184 | u32 clid; | |
1185 | struct Qdisc *q, *p; | |
1186 | int err; | |
1187 | ||
5f013c9b | 1188 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1189 | return -EPERM; |
1190 | ||
1da177e4 LT |
1191 | replay: |
1192 | /* Reinit, just in case something touches this. */ | |
de179c8c H |
1193 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1194 | if (err < 0) | |
1195 | return err; | |
1196 | ||
02ef22ca | 1197 | tcm = nlmsg_data(n); |
1da177e4 LT |
1198 | clid = tcm->tcm_parent; |
1199 | q = p = NULL; | |
1200 | ||
cc7ec456 ED |
1201 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1202 | if (!dev) | |
1da177e4 LT |
1203 | return -ENODEV; |
1204 | ||
1e90474c | 1205 | |
1da177e4 LT |
1206 | if (clid) { |
1207 | if (clid != TC_H_ROOT) { | |
1208 | if (clid != TC_H_INGRESS) { | |
cc7ec456 ED |
1209 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1210 | if (!p) | |
1da177e4 LT |
1211 | return -ENOENT; |
1212 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1213 | } else if (dev_ingress_queue_create(dev)) { |
1214 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1215 | } |
1216 | } else { | |
af356afa | 1217 | q = dev->qdisc; |
1da177e4 LT |
1218 | } |
1219 | ||
1220 | /* It may be default qdisc, ignore it */ | |
1221 | if (q && q->handle == 0) | |
1222 | q = NULL; | |
1223 | ||
1224 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1225 | if (tcm->tcm_handle) { | |
cc7ec456 | 1226 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
1da177e4 LT |
1227 | return -EEXIST; |
1228 | if (TC_H_MIN(tcm->tcm_handle)) | |
1229 | return -EINVAL; | |
cc7ec456 ED |
1230 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1231 | if (!q) | |
1da177e4 | 1232 | goto create_n_graft; |
cc7ec456 | 1233 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1234 | return -EEXIST; |
1e90474c | 1235 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1236 | return -EINVAL; |
1237 | if (q == p || | |
1238 | (p && check_loop(q, p, 0))) | |
1239 | return -ELOOP; | |
1240 | atomic_inc(&q->refcnt); | |
1241 | goto graft; | |
1242 | } else { | |
cc7ec456 | 1243 | if (!q) |
1da177e4 LT |
1244 | goto create_n_graft; |
1245 | ||
1246 | /* This magic test requires explanation. | |
1247 | * | |
1248 | * We know, that some child q is already | |
1249 | * attached to this parent and have choice: | |
1250 | * either to change it or to create/graft new one. | |
1251 | * | |
1252 | * 1. We are allowed to create/graft only | |
1253 | * if CREATE and REPLACE flags are set. | |
1254 | * | |
1255 | * 2. If EXCL is set, requestor wanted to say, | |
1256 | * that qdisc tcm_handle is not expected | |
1257 | * to exist, so that we choose create/graft too. | |
1258 | * | |
1259 | * 3. The last case is when no flags are set. | |
1260 | * Alas, it is sort of hole in API, we | |
1261 | * cannot decide what to do unambiguously. | |
1262 | * For now we select create/graft, if | |
1263 | * user gave KIND, which does not match existing. | |
1264 | */ | |
cc7ec456 ED |
1265 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1266 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1267 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1268 | (tca[TCA_KIND] && |
1269 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1270 | goto create_n_graft; |
1271 | } | |
1272 | } | |
1273 | } else { | |
1274 | if (!tcm->tcm_handle) | |
1275 | return -EINVAL; | |
1276 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1277 | } | |
1278 | ||
1279 | /* Change qdisc parameters */ | |
1280 | if (q == NULL) | |
1281 | return -ENOENT; | |
cc7ec456 | 1282 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1283 | return -EEXIST; |
1e90474c | 1284 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1285 | return -EINVAL; |
1286 | err = qdisc_change(q, tca); | |
1287 | if (err == 0) | |
7316ae88 | 1288 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1289 | return err; |
1290 | ||
1291 | create_n_graft: | |
cc7ec456 | 1292 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
1da177e4 | 1293 | return -ENOENT; |
24824a09 ED |
1294 | if (clid == TC_H_INGRESS) { |
1295 | if (dev_ingress_queue(dev)) | |
1296 | q = qdisc_create(dev, dev_ingress_queue(dev), p, | |
1297 | tcm->tcm_parent, tcm->tcm_parent, | |
1298 | tca, &err); | |
1299 | else | |
1300 | err = -ENOENT; | |
1301 | } else { | |
926e61b7 | 1302 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1303 | |
1304 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1305 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1306 | else if (p) | |
1307 | dev_queue = p->dev_queue; | |
1308 | else | |
1309 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1310 | |
926e61b7 | 1311 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1312 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1313 | tca, &err); |
6ec1c69a | 1314 | } |
1da177e4 LT |
1315 | if (q == NULL) { |
1316 | if (err == -EAGAIN) | |
1317 | goto replay; | |
1318 | return err; | |
1319 | } | |
1320 | ||
1321 | graft: | |
e5befbd9 IJ |
1322 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1323 | if (err) { | |
1324 | if (q) | |
1325 | qdisc_destroy(q); | |
1326 | return err; | |
1da177e4 | 1327 | } |
e5befbd9 | 1328 | |
1da177e4 LT |
1329 | return 0; |
1330 | } | |
1331 | ||
1332 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
15e47304 | 1333 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 | 1334 | { |
22e0f8b9 | 1335 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; |
b0ab6f92 | 1336 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; |
1da177e4 LT |
1337 | struct tcmsg *tcm; |
1338 | struct nlmsghdr *nlh; | |
27a884dc | 1339 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1340 | struct gnet_dump d; |
a2da570d | 1341 | struct qdisc_size_table *stab; |
64015853 | 1342 | __u32 qlen; |
1da177e4 | 1343 | |
fba373d2 | 1344 | cond_resched(); |
15e47304 | 1345 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1346 | if (!nlh) |
1347 | goto out_nlmsg_trim; | |
1348 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1349 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 PM |
1350 | tcm->tcm__pad1 = 0; |
1351 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1352 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1353 | tcm->tcm_parent = clid; |
1354 | tcm->tcm_handle = q->handle; | |
1355 | tcm->tcm_info = atomic_read(&q->refcnt); | |
1b34ec43 DM |
1356 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1357 | goto nla_put_failure; | |
1da177e4 | 1358 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1359 | goto nla_put_failure; |
64015853 | 1360 | qlen = q->q.qlen; |
1da177e4 | 1361 | |
a2da570d ED |
1362 | stab = rtnl_dereference(q->stab); |
1363 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
175f9c1b JK |
1364 | goto nla_put_failure; |
1365 | ||
102396ae | 1366 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
edb09eb1 | 1367 | NULL, &d, TCA_PAD) < 0) |
1e90474c | 1368 | goto nla_put_failure; |
1da177e4 LT |
1369 | |
1370 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1371 | goto nla_put_failure; |
1da177e4 | 1372 | |
b0ab6f92 | 1373 | if (qdisc_is_percpu_stats(q)) { |
22e0f8b9 | 1374 | cpu_bstats = q->cpu_bstats; |
b0ab6f92 JF |
1375 | cpu_qstats = q->cpu_qstats; |
1376 | } | |
22e0f8b9 | 1377 | |
edb09eb1 ED |
1378 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q), |
1379 | &d, cpu_bstats, &q->bstats) < 0 || | |
d250a5f9 | 1380 | gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || |
b0ab6f92 | 1381 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) |
1e90474c | 1382 | goto nla_put_failure; |
10297b99 | 1383 | |
1da177e4 | 1384 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1385 | goto nla_put_failure; |
10297b99 | 1386 | |
27a884dc | 1387 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1388 | return skb->len; |
1389 | ||
02ef22ca | 1390 | out_nlmsg_trim: |
1e90474c | 1391 | nla_put_failure: |
dc5fc579 | 1392 | nlmsg_trim(skb, b); |
1da177e4 LT |
1393 | return -1; |
1394 | } | |
1395 | ||
53b0f080 ED |
1396 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1397 | { | |
1398 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1399 | } | |
1400 | ||
7316ae88 TG |
1401 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1402 | struct nlmsghdr *n, u32 clid, | |
1403 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1404 | { |
1405 | struct sk_buff *skb; | |
15e47304 | 1406 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1407 | |
1408 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1409 | if (!skb) | |
1410 | return -ENOBUFS; | |
1411 | ||
53b0f080 | 1412 | if (old && !tc_qdisc_dump_ignore(old)) { |
15e47304 | 1413 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1414 | 0, RTM_DELQDISC) < 0) |
1da177e4 LT |
1415 | goto err_out; |
1416 | } | |
53b0f080 | 1417 | if (new && !tc_qdisc_dump_ignore(new)) { |
15e47304 | 1418 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1419 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
1da177e4 LT |
1420 | goto err_out; |
1421 | } | |
1422 | ||
1423 | if (skb->len) | |
15e47304 | 1424 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1425 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1426 | |
1427 | err_out: | |
1428 | kfree_skb(skb); | |
1429 | return -EINVAL; | |
1430 | } | |
1431 | ||
30723673 DM |
1432 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1433 | struct netlink_callback *cb, | |
1434 | int *q_idx_p, int s_q_idx) | |
1435 | { | |
1436 | int ret = 0, q_idx = *q_idx_p; | |
1437 | struct Qdisc *q; | |
1438 | ||
1439 | if (!root) | |
1440 | return 0; | |
1441 | ||
1442 | q = root; | |
1443 | if (q_idx < s_q_idx) { | |
1444 | q_idx++; | |
1445 | } else { | |
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 | list_for_each_entry(q, &root->list, list) { | |
1453 | if (q_idx < s_q_idx) { | |
1454 | q_idx++; | |
1455 | continue; | |
1456 | } | |
cc7ec456 | 1457 | if (!tc_qdisc_dump_ignore(q) && |
15e47304 | 1458 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1459 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1460 | goto done; | |
1461 | q_idx++; | |
1462 | } | |
1463 | ||
1464 | out: | |
1465 | *q_idx_p = q_idx; | |
1466 | return ret; | |
1467 | done: | |
1468 | ret = -1; | |
1469 | goto out; | |
1470 | } | |
1471 | ||
1da177e4 LT |
1472 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1473 | { | |
3b1e0a65 | 1474 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1475 | int idx, q_idx; |
1476 | int s_idx, s_q_idx; | |
1477 | struct net_device *dev; | |
1da177e4 LT |
1478 | |
1479 | s_idx = cb->args[0]; | |
1480 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1481 | |
7562f876 | 1482 | idx = 0; |
15dc36eb ED |
1483 | ASSERT_RTNL(); |
1484 | for_each_netdev(net, dev) { | |
30723673 DM |
1485 | struct netdev_queue *dev_queue; |
1486 | ||
1da177e4 | 1487 | if (idx < s_idx) |
7562f876 | 1488 | goto cont; |
1da177e4 LT |
1489 | if (idx > s_idx) |
1490 | s_q_idx = 0; | |
1da177e4 | 1491 | q_idx = 0; |
30723673 | 1492 | |
af356afa | 1493 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1494 | goto done; |
1495 | ||
24824a09 ED |
1496 | dev_queue = dev_ingress_queue(dev); |
1497 | if (dev_queue && | |
1498 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
1499 | &q_idx, s_q_idx) < 0) | |
30723673 DM |
1500 | goto done; |
1501 | ||
7562f876 PE |
1502 | cont: |
1503 | idx++; | |
1da177e4 LT |
1504 | } |
1505 | ||
1506 | done: | |
1da177e4 LT |
1507 | cb->args[0] = idx; |
1508 | cb->args[1] = q_idx; | |
1509 | ||
1510 | return skb->len; | |
1511 | } | |
1512 | ||
1513 | ||
1514 | ||
1515 | /************************************************ | |
1516 | * Traffic classes manipulation. * | |
1517 | ************************************************/ | |
1518 | ||
1519 | ||
1520 | ||
661d2967 | 1521 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1522 | { |
3b1e0a65 | 1523 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1524 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1525 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1526 | struct net_device *dev; |
1527 | struct Qdisc *q = NULL; | |
20fea08b | 1528 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1529 | unsigned long cl = 0; |
1530 | unsigned long new_cl; | |
de179c8c H |
1531 | u32 portid; |
1532 | u32 clid; | |
1533 | u32 qid; | |
1da177e4 LT |
1534 | int err; |
1535 | ||
4e8bbb81 | 1536 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
5f013c9b | 1537 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1538 | return -EPERM; |
1539 | ||
1e90474c PM |
1540 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1541 | if (err < 0) | |
1542 | return err; | |
1543 | ||
de179c8c H |
1544 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1545 | if (!dev) | |
1546 | return -ENODEV; | |
1547 | ||
1da177e4 LT |
1548 | /* |
1549 | parent == TC_H_UNSPEC - unspecified parent. | |
1550 | parent == TC_H_ROOT - class is root, which has no parent. | |
1551 | parent == X:0 - parent is root class. | |
1552 | parent == X:Y - parent is a node in hierarchy. | |
1553 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1554 | ||
1555 | handle == 0:0 - generate handle from kernel pool. | |
1556 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1557 | handle == X:Y - clear. | |
1558 | handle == X:0 - root class. | |
1559 | */ | |
1560 | ||
1561 | /* Step 1. Determine qdisc handle X:0 */ | |
1562 | ||
de179c8c H |
1563 | portid = tcm->tcm_parent; |
1564 | clid = tcm->tcm_handle; | |
1565 | qid = TC_H_MAJ(clid); | |
1566 | ||
15e47304 EB |
1567 | if (portid != TC_H_ROOT) { |
1568 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
1569 | |
1570 | if (qid && qid1) { | |
1571 | /* If both majors are known, they must be identical. */ | |
1572 | if (qid != qid1) | |
1573 | return -EINVAL; | |
1574 | } else if (qid1) { | |
1575 | qid = qid1; | |
1576 | } else if (qid == 0) | |
af356afa | 1577 | qid = dev->qdisc->handle; |
1da177e4 LT |
1578 | |
1579 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1580 | * both with parent and child. |
1581 | * | |
15e47304 | 1582 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 1583 | */ |
15e47304 EB |
1584 | if (portid) |
1585 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
1586 | } else { |
1587 | if (qid == 0) | |
af356afa | 1588 | qid = dev->qdisc->handle; |
1da177e4 LT |
1589 | } |
1590 | ||
1591 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1592 | q = qdisc_lookup(dev, qid); |
1593 | if (!q) | |
1da177e4 LT |
1594 | return -ENOENT; |
1595 | ||
1596 | /* An check that it supports classes */ | |
1597 | cops = q->ops->cl_ops; | |
1598 | if (cops == NULL) | |
1599 | return -EINVAL; | |
1600 | ||
1601 | /* Now try to get class */ | |
1602 | if (clid == 0) { | |
15e47304 | 1603 | if (portid == TC_H_ROOT) |
1da177e4 LT |
1604 | clid = qid; |
1605 | } else | |
1606 | clid = TC_H_MAKE(qid, clid); | |
1607 | ||
1608 | if (clid) | |
1609 | cl = cops->get(q, clid); | |
1610 | ||
1611 | if (cl == 0) { | |
1612 | err = -ENOENT; | |
cc7ec456 ED |
1613 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1614 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1615 | goto out; |
1616 | } else { | |
1617 | switch (n->nlmsg_type) { | |
10297b99 | 1618 | case RTM_NEWTCLASS: |
1da177e4 | 1619 | err = -EEXIST; |
cc7ec456 | 1620 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1621 | goto out; |
1622 | break; | |
1623 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1624 | err = -EOPNOTSUPP; |
1625 | if (cops->delete) | |
1626 | err = cops->delete(q, cl); | |
1da177e4 | 1627 | if (err == 0) |
7316ae88 | 1628 | tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); |
1da177e4 LT |
1629 | goto out; |
1630 | case RTM_GETTCLASS: | |
7316ae88 | 1631 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1632 | goto out; |
1633 | default: | |
1634 | err = -EINVAL; | |
1635 | goto out; | |
1636 | } | |
1637 | } | |
1638 | ||
1639 | new_cl = cl; | |
de6d5cdf PM |
1640 | err = -EOPNOTSUPP; |
1641 | if (cops->change) | |
15e47304 | 1642 | err = cops->change(q, clid, portid, tca, &new_cl); |
1da177e4 | 1643 | if (err == 0) |
7316ae88 | 1644 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1645 | |
1646 | out: | |
1647 | if (cl) | |
1648 | cops->put(q, cl); | |
1649 | ||
1650 | return err; | |
1651 | } | |
1652 | ||
1653 | ||
1654 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1655 | unsigned long cl, | |
15e47304 | 1656 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1657 | { |
1658 | struct tcmsg *tcm; | |
1659 | struct nlmsghdr *nlh; | |
27a884dc | 1660 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1661 | struct gnet_dump d; |
20fea08b | 1662 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1663 | |
fba373d2 | 1664 | cond_resched(); |
15e47304 | 1665 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1666 | if (!nlh) |
1667 | goto out_nlmsg_trim; | |
1668 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1669 | tcm->tcm_family = AF_UNSPEC; |
16ebb5e0 ED |
1670 | tcm->tcm__pad1 = 0; |
1671 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1672 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1673 | tcm->tcm_parent = q->handle; |
1674 | tcm->tcm_handle = q->handle; | |
1675 | tcm->tcm_info = 0; | |
1b34ec43 DM |
1676 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1677 | goto nla_put_failure; | |
1da177e4 | 1678 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1679 | goto nla_put_failure; |
1da177e4 | 1680 | |
102396ae | 1681 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
edb09eb1 | 1682 | NULL, &d, TCA_PAD) < 0) |
1e90474c | 1683 | goto nla_put_failure; |
1da177e4 LT |
1684 | |
1685 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1686 | goto nla_put_failure; |
1da177e4 LT |
1687 | |
1688 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1689 | goto nla_put_failure; |
1da177e4 | 1690 | |
27a884dc | 1691 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1692 | return skb->len; |
1693 | ||
02ef22ca | 1694 | out_nlmsg_trim: |
1e90474c | 1695 | nla_put_failure: |
dc5fc579 | 1696 | nlmsg_trim(skb, b); |
1da177e4 LT |
1697 | return -1; |
1698 | } | |
1699 | ||
7316ae88 TG |
1700 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1701 | struct nlmsghdr *n, struct Qdisc *q, | |
1702 | unsigned long cl, int event) | |
1da177e4 LT |
1703 | { |
1704 | struct sk_buff *skb; | |
15e47304 | 1705 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1706 | |
1707 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1708 | if (!skb) | |
1709 | return -ENOBUFS; | |
1710 | ||
15e47304 | 1711 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { |
1da177e4 LT |
1712 | kfree_skb(skb); |
1713 | return -EINVAL; | |
1714 | } | |
1715 | ||
15e47304 | 1716 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1717 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1718 | } |
1719 | ||
cc7ec456 ED |
1720 | struct qdisc_dump_args { |
1721 | struct qdisc_walker w; | |
1722 | struct sk_buff *skb; | |
1723 | struct netlink_callback *cb; | |
1da177e4 LT |
1724 | }; |
1725 | ||
1726 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1727 | { | |
1728 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1729 | ||
15e47304 | 1730 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
1da177e4 LT |
1731 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); |
1732 | } | |
1733 | ||
30723673 DM |
1734 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1735 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1736 | int *t_p, int s_t) | |
1737 | { | |
1738 | struct qdisc_dump_args arg; | |
1739 | ||
1740 | if (tc_qdisc_dump_ignore(q) || | |
1741 | *t_p < s_t || !q->ops->cl_ops || | |
1742 | (tcm->tcm_parent && | |
1743 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1744 | (*t_p)++; | |
1745 | return 0; | |
1746 | } | |
1747 | if (*t_p > s_t) | |
1748 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1749 | arg.w.fn = qdisc_class_dump; | |
1750 | arg.skb = skb; | |
1751 | arg.cb = cb; | |
1752 | arg.w.stop = 0; | |
1753 | arg.w.skip = cb->args[1]; | |
1754 | arg.w.count = 0; | |
1755 | q->ops->cl_ops->walk(q, &arg.w); | |
1756 | cb->args[1] = arg.w.count; | |
1757 | if (arg.w.stop) | |
1758 | return -1; | |
1759 | (*t_p)++; | |
1760 | return 0; | |
1761 | } | |
1762 | ||
1763 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1764 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1765 | int *t_p, int s_t) | |
1766 | { | |
1767 | struct Qdisc *q; | |
1768 | ||
1769 | if (!root) | |
1770 | return 0; | |
1771 | ||
1772 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1773 | return -1; | |
1774 | ||
1775 | list_for_each_entry(q, &root->list, list) { | |
1776 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1777 | return -1; | |
1778 | } | |
1779 | ||
1780 | return 0; | |
1781 | } | |
1782 | ||
1da177e4 LT |
1783 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1784 | { | |
02ef22ca | 1785 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 1786 | struct net *net = sock_net(skb->sk); |
30723673 | 1787 | struct netdev_queue *dev_queue; |
1da177e4 | 1788 | struct net_device *dev; |
30723673 | 1789 | int t, s_t; |
1da177e4 | 1790 | |
573ce260 | 1791 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1792 | return 0; |
cc7ec456 ED |
1793 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
1794 | if (!dev) | |
1da177e4 LT |
1795 | return 0; |
1796 | ||
1797 | s_t = cb->args[0]; | |
1798 | t = 0; | |
1799 | ||
af356afa | 1800 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1801 | goto done; |
1802 | ||
24824a09 ED |
1803 | dev_queue = dev_ingress_queue(dev); |
1804 | if (dev_queue && | |
1805 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
1806 | &t, s_t) < 0) | |
30723673 | 1807 | goto done; |
1da177e4 | 1808 | |
30723673 | 1809 | done: |
1da177e4 LT |
1810 | cb->args[0] = t; |
1811 | ||
1812 | dev_put(dev); | |
1813 | return skb->len; | |
1814 | } | |
1815 | ||
1816 | /* Main classifier routine: scans classifier chain attached | |
cc7ec456 ED |
1817 | * to this qdisc, (optionally) tests for protocol and asks |
1818 | * specific classifiers. | |
1da177e4 | 1819 | */ |
3b3ae880 DB |
1820 | int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1821 | struct tcf_result *res, bool compat_mode) | |
73ca4918 | 1822 | { |
d8b9605d | 1823 | __be16 protocol = tc_skb_protocol(skb); |
3b3ae880 DB |
1824 | #ifdef CONFIG_NET_CLS_ACT |
1825 | const struct tcf_proto *old_tp = tp; | |
1826 | int limit = 0; | |
73ca4918 | 1827 | |
3b3ae880 DB |
1828 | reclassify: |
1829 | #endif | |
25d8c0d5 | 1830 | for (; tp; tp = rcu_dereference_bh(tp->next)) { |
3b3ae880 DB |
1831 | int err; |
1832 | ||
cc7ec456 ED |
1833 | if (tp->protocol != protocol && |
1834 | tp->protocol != htons(ETH_P_ALL)) | |
1835 | continue; | |
cc7ec456 | 1836 | |
3b3ae880 DB |
1837 | err = tp->classify(skb, tp, res); |
1838 | #ifdef CONFIG_NET_CLS_ACT | |
c1b3b199 | 1839 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) |
3b3ae880 DB |
1840 | goto reset; |
1841 | #endif | |
e578d9c0 | 1842 | if (err >= 0) |
73ca4918 | 1843 | return err; |
73ca4918 | 1844 | } |
73ca4918 | 1845 | |
7e6e18fb | 1846 | return TC_ACT_UNSPEC; /* signal: continue lookup */ |
1da177e4 | 1847 | #ifdef CONFIG_NET_CLS_ACT |
3b3ae880 DB |
1848 | reset: |
1849 | if (unlikely(limit++ >= MAX_REC_LOOP)) { | |
c1b3b199 DB |
1850 | net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", |
1851 | tp->q->ops->id, tp->prio & 0xffff, | |
1852 | ntohs(tp->protocol)); | |
3b3ae880 | 1853 | return TC_ACT_SHOT; |
1da177e4 | 1854 | } |
3b3ae880 DB |
1855 | |
1856 | tp = old_tp; | |
619fe326 | 1857 | protocol = tc_skb_protocol(skb); |
3b3ae880 | 1858 | goto reclassify; |
73ca4918 | 1859 | #endif |
1da177e4 | 1860 | } |
73ca4918 | 1861 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1862 | |
1e052be6 | 1863 | bool tcf_destroy(struct tcf_proto *tp, bool force) |
a48b5a61 | 1864 | { |
1e052be6 CW |
1865 | if (tp->ops->destroy(tp, force)) { |
1866 | module_put(tp->ops->owner); | |
1867 | kfree_rcu(tp, rcu); | |
1868 | return true; | |
1869 | } | |
1870 | ||
1871 | return false; | |
a48b5a61 PM |
1872 | } |
1873 | ||
25d8c0d5 | 1874 | void tcf_destroy_chain(struct tcf_proto __rcu **fl) |
a48b5a61 PM |
1875 | { |
1876 | struct tcf_proto *tp; | |
1877 | ||
25d8c0d5 JF |
1878 | while ((tp = rtnl_dereference(*fl)) != NULL) { |
1879 | RCU_INIT_POINTER(*fl, tp->next); | |
1e052be6 | 1880 | tcf_destroy(tp, true); |
a48b5a61 PM |
1881 | } |
1882 | } | |
1883 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1884 | ||
1da177e4 LT |
1885 | #ifdef CONFIG_PROC_FS |
1886 | static int psched_show(struct seq_file *seq, void *v) | |
1887 | { | |
1888 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 1889 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1890 | 1000000, |
1e317688 | 1891 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
1892 | |
1893 | return 0; | |
1894 | } | |
1895 | ||
1896 | static int psched_open(struct inode *inode, struct file *file) | |
1897 | { | |
7e5ab157 | 1898 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1899 | } |
1900 | ||
da7071d7 | 1901 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1902 | .owner = THIS_MODULE, |
1903 | .open = psched_open, | |
1904 | .read = seq_read, | |
1905 | .llseek = seq_lseek, | |
1906 | .release = single_release, | |
10297b99 | 1907 | }; |
7316ae88 TG |
1908 | |
1909 | static int __net_init psched_net_init(struct net *net) | |
1910 | { | |
1911 | struct proc_dir_entry *e; | |
1912 | ||
d4beaa66 | 1913 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
7316ae88 TG |
1914 | if (e == NULL) |
1915 | return -ENOMEM; | |
1916 | ||
1917 | return 0; | |
1918 | } | |
1919 | ||
1920 | static void __net_exit psched_net_exit(struct net *net) | |
1921 | { | |
ece31ffd | 1922 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
1923 | } |
1924 | #else | |
1925 | static int __net_init psched_net_init(struct net *net) | |
1926 | { | |
1927 | return 0; | |
1928 | } | |
1929 | ||
1930 | static void __net_exit psched_net_exit(struct net *net) | |
1931 | { | |
1932 | } | |
1da177e4 LT |
1933 | #endif |
1934 | ||
7316ae88 TG |
1935 | static struct pernet_operations psched_net_ops = { |
1936 | .init = psched_net_init, | |
1937 | .exit = psched_net_exit, | |
1938 | }; | |
1939 | ||
1da177e4 LT |
1940 | static int __init pktsched_init(void) |
1941 | { | |
7316ae88 TG |
1942 | int err; |
1943 | ||
1944 | err = register_pernet_subsys(&psched_net_ops); | |
1945 | if (err) { | |
cc7ec456 | 1946 | pr_err("pktsched_init: " |
7316ae88 TG |
1947 | "cannot initialize per netns operations\n"); |
1948 | return err; | |
1949 | } | |
1950 | ||
6da7c8fc | 1951 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
1952 | register_qdisc(&pfifo_qdisc_ops); |
1953 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1954 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1955 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 1956 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 1957 | |
c7ac8679 GR |
1958 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL); |
1959 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL); | |
1960 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL); | |
1961 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL); | |
1962 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL); | |
1963 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL); | |
be577ddc | 1964 | |
1da177e4 LT |
1965 | return 0; |
1966 | } | |
1967 | ||
1968 | subsys_initcall(pktsched_init); |