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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> |
59cc1f61 | 32 | #include <linux/hashtable.h> |
1da177e4 | 33 | |
457c4cbc | 34 | #include <net/net_namespace.h> |
b854272b | 35 | #include <net/sock.h> |
dc5fc579 | 36 | #include <net/netlink.h> |
1da177e4 LT |
37 | #include <net/pkt_sched.h> |
38 | ||
7316ae88 TG |
39 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
40 | struct nlmsghdr *n, u32 clid, | |
1da177e4 | 41 | struct Qdisc *old, struct Qdisc *new); |
7316ae88 TG |
42 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
43 | struct nlmsghdr *n, struct Qdisc *q, | |
44 | unsigned long cl, int event); | |
1da177e4 LT |
45 | |
46 | /* | |
47 | ||
48 | Short review. | |
49 | ------------- | |
50 | ||
51 | This file consists of two interrelated parts: | |
52 | ||
53 | 1. queueing disciplines manager frontend. | |
54 | 2. traffic classes manager frontend. | |
55 | ||
56 | Generally, queueing discipline ("qdisc") is a black box, | |
57 | which is able to enqueue packets and to dequeue them (when | |
58 | device is ready to send something) in order and at times | |
59 | determined by algorithm hidden in it. | |
60 | ||
61 | qdisc's are divided to two categories: | |
62 | - "queues", which have no internal structure visible from outside. | |
63 | - "schedulers", which split all the packets to "traffic classes", | |
64 | using "packet classifiers" (look at cls_api.c) | |
65 | ||
66 | In turn, classes may have child qdiscs (as rule, queues) | |
67 | attached to them etc. etc. etc. | |
68 | ||
69 | The goal of the routines in this file is to translate | |
70 | information supplied by user in the form of handles | |
71 | to more intelligible for kernel form, to make some sanity | |
72 | checks and part of work, which is common to all qdiscs | |
73 | and to provide rtnetlink notifications. | |
74 | ||
75 | All real intelligent work is done inside qdisc modules. | |
76 | ||
77 | ||
78 | ||
79 | Every discipline has two major routines: enqueue and dequeue. | |
80 | ||
81 | ---dequeue | |
82 | ||
83 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
84 | but it does not mean that queue is empty, it just means that | |
85 | discipline does not want to send anything this time. | |
86 | Queue is really empty if q->q.qlen == 0. | |
87 | For complicated disciplines with multiple queues q->q is not | |
88 | real packet queue, but however q->q.qlen must be valid. | |
89 | ||
90 | ---enqueue | |
91 | ||
92 | enqueue returns 0, if packet was enqueued successfully. | |
93 | If packet (this one or another one) was dropped, it returns | |
94 | not zero error code. | |
95 | NET_XMIT_DROP - this packet dropped | |
96 | Expected action: do not backoff, but wait until queue will clear. | |
97 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
98 | Expected action: backoff or ignore | |
1da177e4 LT |
99 | |
100 | Auxiliary routines: | |
101 | ||
99c0db26 JP |
102 | ---peek |
103 | ||
104 | like dequeue but without removing a packet from the queue | |
105 | ||
1da177e4 LT |
106 | ---reset |
107 | ||
108 | returns qdisc to initial state: purge all buffers, clear all | |
109 | timers, counters (except for statistics) etc. | |
110 | ||
111 | ---init | |
112 | ||
113 | initializes newly created qdisc. | |
114 | ||
115 | ---destroy | |
116 | ||
117 | destroys resources allocated by init and during lifetime of qdisc. | |
118 | ||
119 | ---change | |
120 | ||
121 | changes qdisc parameters. | |
122 | */ | |
123 | ||
124 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
125 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
126 | ||
127 | ||
128 | /************************************************ | |
129 | * Queueing disciplines manipulation. * | |
130 | ************************************************/ | |
131 | ||
132 | ||
133 | /* The list of all installed queueing disciplines. */ | |
134 | ||
135 | static struct Qdisc_ops *qdisc_base; | |
136 | ||
21eb2189 | 137 | /* Register/unregister queueing discipline */ |
1da177e4 LT |
138 | |
139 | int register_qdisc(struct Qdisc_ops *qops) | |
140 | { | |
141 | struct Qdisc_ops *q, **qp; | |
142 | int rc = -EEXIST; | |
143 | ||
144 | write_lock(&qdisc_mod_lock); | |
145 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
146 | if (!strcmp(qops->id, q->id)) | |
147 | goto out; | |
148 | ||
149 | if (qops->enqueue == NULL) | |
150 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 | 151 | if (qops->peek == NULL) { |
68fd26b5 | 152 | if (qops->dequeue == NULL) |
99c0db26 | 153 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
154 | else |
155 | goto out_einval; | |
99c0db26 | 156 | } |
1da177e4 LT |
157 | if (qops->dequeue == NULL) |
158 | qops->dequeue = noop_qdisc_ops.dequeue; | |
159 | ||
68fd26b5 JP |
160 | if (qops->cl_ops) { |
161 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
162 | ||
3e9e5a59 | 163 | if (!(cops->get && cops->put && cops->walk && cops->leaf)) |
68fd26b5 JP |
164 | goto out_einval; |
165 | ||
166 | if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf)) | |
167 | goto out_einval; | |
168 | } | |
169 | ||
1da177e4 LT |
170 | qops->next = NULL; |
171 | *qp = qops; | |
172 | rc = 0; | |
173 | out: | |
174 | write_unlock(&qdisc_mod_lock); | |
175 | return rc; | |
68fd26b5 JP |
176 | |
177 | out_einval: | |
178 | rc = -EINVAL; | |
179 | goto out; | |
1da177e4 | 180 | } |
62e3ba1b | 181 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
182 | |
183 | int unregister_qdisc(struct Qdisc_ops *qops) | |
184 | { | |
185 | struct Qdisc_ops *q, **qp; | |
186 | int err = -ENOENT; | |
187 | ||
188 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 189 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
190 | if (q == qops) |
191 | break; | |
192 | if (q) { | |
193 | *qp = q->next; | |
194 | q->next = NULL; | |
195 | err = 0; | |
196 | } | |
197 | write_unlock(&qdisc_mod_lock); | |
198 | return err; | |
199 | } | |
62e3ba1b | 200 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 | 201 | |
6da7c8fc | 202 | /* Get default qdisc if not otherwise specified */ |
203 | void qdisc_get_default(char *name, size_t len) | |
204 | { | |
205 | read_lock(&qdisc_mod_lock); | |
206 | strlcpy(name, default_qdisc_ops->id, len); | |
207 | read_unlock(&qdisc_mod_lock); | |
208 | } | |
209 | ||
210 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) | |
211 | { | |
212 | struct Qdisc_ops *q = NULL; | |
213 | ||
214 | for (q = qdisc_base; q; q = q->next) { | |
215 | if (!strcmp(name, q->id)) { | |
216 | if (!try_module_get(q->owner)) | |
217 | q = NULL; | |
218 | break; | |
219 | } | |
220 | } | |
221 | ||
222 | return q; | |
223 | } | |
224 | ||
225 | /* Set new default qdisc to use */ | |
226 | int qdisc_set_default(const char *name) | |
227 | { | |
228 | const struct Qdisc_ops *ops; | |
229 | ||
230 | if (!capable(CAP_NET_ADMIN)) | |
231 | return -EPERM; | |
232 | ||
233 | write_lock(&qdisc_mod_lock); | |
234 | ops = qdisc_lookup_default(name); | |
235 | if (!ops) { | |
236 | /* Not found, drop lock and try to load module */ | |
237 | write_unlock(&qdisc_mod_lock); | |
238 | request_module("sch_%s", name); | |
239 | write_lock(&qdisc_mod_lock); | |
240 | ||
241 | ops = qdisc_lookup_default(name); | |
242 | } | |
243 | ||
244 | if (ops) { | |
245 | /* Set new default */ | |
246 | module_put(default_qdisc_ops->owner); | |
247 | default_qdisc_ops = ops; | |
248 | } | |
249 | write_unlock(&qdisc_mod_lock); | |
250 | ||
251 | return ops ? 0 : -ENOENT; | |
252 | } | |
253 | ||
1da177e4 | 254 | /* We know handle. Find qdisc among all qdisc's attached to device |
4eaf3b84 ED |
255 | * (root qdisc, all its children, children of children etc.) |
256 | * Note: caller either uses rtnl or rcu_read_lock() | |
1da177e4 LT |
257 | */ |
258 | ||
6113b748 | 259 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
260 | { |
261 | struct Qdisc *q; | |
262 | ||
69012ae4 JK |
263 | if (!qdisc_dev(root)) |
264 | return (root->handle == handle ? root : NULL); | |
265 | ||
8123b421 DM |
266 | if (!(root->flags & TCQ_F_BUILTIN) && |
267 | root->handle == handle) | |
268 | return root; | |
269 | ||
59cc1f61 | 270 | hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) { |
8123b421 DM |
271 | if (q->handle == handle) |
272 | return q; | |
273 | } | |
274 | return NULL; | |
275 | } | |
276 | ||
59cc1f61 | 277 | void qdisc_hash_add(struct Qdisc *q) |
f6e0b239 | 278 | { |
37314363 ED |
279 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
280 | struct Qdisc *root = qdisc_dev(q)->qdisc; | |
e57a784d | 281 | |
37314363 | 282 | WARN_ON_ONCE(root == &noop_qdisc); |
4eaf3b84 | 283 | ASSERT_RTNL(); |
59cc1f61 | 284 | hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle); |
37314363 | 285 | } |
f6e0b239 | 286 | } |
59cc1f61 | 287 | EXPORT_SYMBOL(qdisc_hash_add); |
f6e0b239 | 288 | |
59cc1f61 | 289 | void qdisc_hash_del(struct Qdisc *q) |
f6e0b239 | 290 | { |
4eaf3b84 ED |
291 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
292 | ASSERT_RTNL(); | |
59cc1f61 | 293 | hash_del_rcu(&q->hash); |
4eaf3b84 | 294 | } |
f6e0b239 | 295 | } |
59cc1f61 | 296 | EXPORT_SYMBOL(qdisc_hash_del); |
f6e0b239 | 297 | |
ead81cc5 | 298 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 299 | { |
f6e0b239 JP |
300 | struct Qdisc *q; |
301 | ||
af356afa PM |
302 | q = qdisc_match_from_root(dev->qdisc, handle); |
303 | if (q) | |
304 | goto out; | |
f6e0b239 | 305 | |
24824a09 ED |
306 | if (dev_ingress_queue(dev)) |
307 | q = qdisc_match_from_root( | |
308 | dev_ingress_queue(dev)->qdisc_sleeping, | |
309 | handle); | |
f6486d40 | 310 | out: |
f6e0b239 | 311 | return q; |
1da177e4 LT |
312 | } |
313 | ||
314 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
315 | { | |
316 | unsigned long cl; | |
317 | struct Qdisc *leaf; | |
20fea08b | 318 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
319 | |
320 | if (cops == NULL) | |
321 | return NULL; | |
322 | cl = cops->get(p, classid); | |
323 | ||
324 | if (cl == 0) | |
325 | return NULL; | |
326 | leaf = cops->leaf(p, cl); | |
327 | cops->put(p, cl); | |
328 | return leaf; | |
329 | } | |
330 | ||
331 | /* Find queueing discipline by name */ | |
332 | ||
1e90474c | 333 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
334 | { |
335 | struct Qdisc_ops *q = NULL; | |
336 | ||
337 | if (kind) { | |
338 | read_lock(&qdisc_mod_lock); | |
339 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 340 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
341 | if (!try_module_get(q->owner)) |
342 | q = NULL; | |
343 | break; | |
344 | } | |
345 | } | |
346 | read_unlock(&qdisc_mod_lock); | |
347 | } | |
348 | return q; | |
349 | } | |
350 | ||
8a8e3d84 JDB |
351 | /* The linklayer setting were not transferred from iproute2, in older |
352 | * versions, and the rate tables lookup systems have been dropped in | |
353 | * the kernel. To keep backward compatible with older iproute2 tc | |
354 | * utils, we detect the linklayer setting by detecting if the rate | |
355 | * table were modified. | |
356 | * | |
357 | * For linklayer ATM table entries, the rate table will be aligned to | |
358 | * 48 bytes, thus some table entries will contain the same value. The | |
359 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
360 | * starting from the mpu, we find low and high table entries for | |
361 | * mapping this cell. If these entries contain the same value, when | |
362 | * the rate tables have been modified for linklayer ATM. | |
363 | * | |
364 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
365 | * and then roundup to the next cell, calc the table entry one below, | |
366 | * and compare. | |
367 | */ | |
368 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
369 | { | |
370 | int low = roundup(r->mpu, 48); | |
371 | int high = roundup(low+1, 48); | |
372 | int cell_low = low >> r->cell_log; | |
373 | int cell_high = (high >> r->cell_log) - 1; | |
374 | ||
375 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
376 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
377 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
378 | return TC_LINKLAYER_ETHERNET; | |
379 | } | |
380 | ||
381 | if ((cell_high > cell_low) && (cell_high < 256) | |
382 | && (rtab[cell_low] == rtab[cell_high])) { | |
383 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
384 | cell_low, cell_high, rtab[cell_high]); | |
385 | return TC_LINKLAYER_ATM; | |
386 | } | |
387 | return TC_LINKLAYER_ETHERNET; | |
388 | } | |
389 | ||
1da177e4 LT |
390 | static struct qdisc_rate_table *qdisc_rtab_list; |
391 | ||
5a7a5555 JHS |
392 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
393 | struct nlattr *tab) | |
1da177e4 LT |
394 | { |
395 | struct qdisc_rate_table *rtab; | |
396 | ||
40edeff6 ED |
397 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
398 | nla_len(tab) != TC_RTAB_SIZE) | |
399 | return NULL; | |
400 | ||
1da177e4 | 401 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
402 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
403 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
404 | rtab->refcnt++; |
405 | return rtab; | |
406 | } | |
407 | } | |
408 | ||
1da177e4 LT |
409 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
410 | if (rtab) { | |
411 | rtab->rate = *r; | |
412 | rtab->refcnt = 1; | |
1e90474c | 413 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
414 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
415 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
416 | rtab->next = qdisc_rtab_list; |
417 | qdisc_rtab_list = rtab; | |
418 | } | |
419 | return rtab; | |
420 | } | |
62e3ba1b | 421 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
422 | |
423 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
424 | { | |
425 | struct qdisc_rate_table *rtab, **rtabp; | |
426 | ||
427 | if (!tab || --tab->refcnt) | |
428 | return; | |
429 | ||
cc7ec456 ED |
430 | for (rtabp = &qdisc_rtab_list; |
431 | (rtab = *rtabp) != NULL; | |
432 | rtabp = &rtab->next) { | |
1da177e4 LT |
433 | if (rtab == tab) { |
434 | *rtabp = rtab->next; | |
435 | kfree(rtab); | |
436 | return; | |
437 | } | |
438 | } | |
439 | } | |
62e3ba1b | 440 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 441 | |
175f9c1b | 442 | static LIST_HEAD(qdisc_stab_list); |
175f9c1b JK |
443 | |
444 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
445 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
446 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
447 | }; | |
448 | ||
449 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
450 | { | |
451 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
452 | struct qdisc_size_table *stab; | |
453 | struct tc_sizespec *s; | |
454 | unsigned int tsize = 0; | |
455 | u16 *tab = NULL; | |
456 | int err; | |
457 | ||
458 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
459 | if (err < 0) | |
460 | return ERR_PTR(err); | |
461 | if (!tb[TCA_STAB_BASE]) | |
462 | return ERR_PTR(-EINVAL); | |
463 | ||
464 | s = nla_data(tb[TCA_STAB_BASE]); | |
465 | ||
466 | if (s->tsize > 0) { | |
467 | if (!tb[TCA_STAB_DATA]) | |
468 | return ERR_PTR(-EINVAL); | |
469 | tab = nla_data(tb[TCA_STAB_DATA]); | |
470 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
471 | } | |
472 | ||
00093fab | 473 | if (tsize != s->tsize || (!tab && tsize > 0)) |
175f9c1b JK |
474 | return ERR_PTR(-EINVAL); |
475 | ||
175f9c1b JK |
476 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
477 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
478 | continue; | |
479 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
480 | continue; | |
481 | stab->refcnt++; | |
175f9c1b JK |
482 | return stab; |
483 | } | |
484 | ||
175f9c1b JK |
485 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); |
486 | if (!stab) | |
487 | return ERR_PTR(-ENOMEM); | |
488 | ||
489 | stab->refcnt = 1; | |
490 | stab->szopts = *s; | |
491 | if (tsize > 0) | |
492 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
493 | ||
175f9c1b | 494 | list_add_tail(&stab->list, &qdisc_stab_list); |
175f9c1b JK |
495 | |
496 | return stab; | |
497 | } | |
498 | ||
a2da570d ED |
499 | static void stab_kfree_rcu(struct rcu_head *head) |
500 | { | |
501 | kfree(container_of(head, struct qdisc_size_table, rcu)); | |
502 | } | |
503 | ||
175f9c1b JK |
504 | void qdisc_put_stab(struct qdisc_size_table *tab) |
505 | { | |
506 | if (!tab) | |
507 | return; | |
508 | ||
175f9c1b JK |
509 | if (--tab->refcnt == 0) { |
510 | list_del(&tab->list); | |
a2da570d | 511 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
175f9c1b | 512 | } |
175f9c1b JK |
513 | } |
514 | EXPORT_SYMBOL(qdisc_put_stab); | |
515 | ||
516 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
517 | { | |
518 | struct nlattr *nest; | |
519 | ||
520 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
521 | if (nest == NULL) |
522 | goto nla_put_failure; | |
1b34ec43 DM |
523 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
524 | goto nla_put_failure; | |
175f9c1b JK |
525 | nla_nest_end(skb, nest); |
526 | ||
527 | return skb->len; | |
528 | ||
529 | nla_put_failure: | |
530 | return -1; | |
531 | } | |
532 | ||
5a7a5555 JHS |
533 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
534 | const struct qdisc_size_table *stab) | |
175f9c1b JK |
535 | { |
536 | int pkt_len, slot; | |
537 | ||
538 | pkt_len = skb->len + stab->szopts.overhead; | |
539 | if (unlikely(!stab->szopts.tsize)) | |
540 | goto out; | |
541 | ||
542 | slot = pkt_len + stab->szopts.cell_align; | |
543 | if (unlikely(slot < 0)) | |
544 | slot = 0; | |
545 | ||
546 | slot >>= stab->szopts.cell_log; | |
547 | if (likely(slot < stab->szopts.tsize)) | |
548 | pkt_len = stab->data[slot]; | |
549 | else | |
550 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
551 | (slot / stab->szopts.tsize) + | |
552 | stab->data[slot % stab->szopts.tsize]; | |
553 | ||
554 | pkt_len <<= stab->szopts.size_log; | |
555 | out: | |
556 | if (unlikely(pkt_len < 1)) | |
557 | pkt_len = 1; | |
558 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
559 | } | |
a2da570d | 560 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 561 | |
6e765a00 | 562 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
563 | { |
564 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
565 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
566 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
567 | qdisc->flags |= TCQ_F_WARN_NONWC; |
568 | } | |
569 | } | |
570 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
571 | ||
4179477f PM |
572 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
573 | { | |
574 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 575 | timer); |
4179477f | 576 | |
1e203c1a | 577 | rcu_read_lock(); |
8608db03 | 578 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 579 | rcu_read_unlock(); |
1936502d | 580 | |
4179477f PM |
581 | return HRTIMER_NORESTART; |
582 | } | |
583 | ||
584 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
585 | { | |
4a8e320c | 586 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 587 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
588 | wd->qdisc = qdisc; |
589 | } | |
590 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
591 | ||
45f50bed | 592 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires) |
4179477f | 593 | { |
2540e051 JP |
594 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
595 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
596 | return; | |
597 | ||
a9efad8b ED |
598 | if (wd->last_expires == expires) |
599 | return; | |
600 | ||
601 | wd->last_expires = expires; | |
46baac38 | 602 | hrtimer_start(&wd->timer, |
34c5d292 | 603 | ns_to_ktime(expires), |
4a8e320c | 604 | HRTIMER_MODE_ABS_PINNED); |
4179477f | 605 | } |
34c5d292 | 606 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
4179477f PM |
607 | |
608 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
609 | { | |
2fbd3da3 | 610 | hrtimer_cancel(&wd->timer); |
4179477f PM |
611 | } |
612 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 613 | |
a94f779f | 614 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
615 | { |
616 | unsigned int size = n * sizeof(struct hlist_head), i; | |
617 | struct hlist_head *h; | |
618 | ||
619 | if (size <= PAGE_SIZE) | |
620 | h = kmalloc(size, GFP_KERNEL); | |
621 | else | |
622 | h = (struct hlist_head *) | |
623 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
624 | ||
625 | if (h != NULL) { | |
626 | for (i = 0; i < n; i++) | |
627 | INIT_HLIST_HEAD(&h[i]); | |
628 | } | |
629 | return h; | |
630 | } | |
631 | ||
632 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
633 | { | |
634 | unsigned int size = n * sizeof(struct hlist_head); | |
635 | ||
636 | if (size <= PAGE_SIZE) | |
637 | kfree(h); | |
638 | else | |
639 | free_pages((unsigned long)h, get_order(size)); | |
640 | } | |
641 | ||
642 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
643 | { | |
644 | struct Qdisc_class_common *cl; | |
b67bfe0d | 645 | struct hlist_node *next; |
6fe1c7a5 PM |
646 | struct hlist_head *nhash, *ohash; |
647 | unsigned int nsize, nmask, osize; | |
648 | unsigned int i, h; | |
649 | ||
650 | /* Rehash when load factor exceeds 0.75 */ | |
651 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
652 | return; | |
653 | nsize = clhash->hashsize * 2; | |
654 | nmask = nsize - 1; | |
655 | nhash = qdisc_class_hash_alloc(nsize); | |
656 | if (nhash == NULL) | |
657 | return; | |
658 | ||
659 | ohash = clhash->hash; | |
660 | osize = clhash->hashsize; | |
661 | ||
662 | sch_tree_lock(sch); | |
663 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 664 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
665 | h = qdisc_class_hash(cl->classid, nmask); |
666 | hlist_add_head(&cl->hnode, &nhash[h]); | |
667 | } | |
668 | } | |
669 | clhash->hash = nhash; | |
670 | clhash->hashsize = nsize; | |
671 | clhash->hashmask = nmask; | |
672 | sch_tree_unlock(sch); | |
673 | ||
674 | qdisc_class_hash_free(ohash, osize); | |
675 | } | |
676 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
677 | ||
678 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
679 | { | |
680 | unsigned int size = 4; | |
681 | ||
682 | clhash->hash = qdisc_class_hash_alloc(size); | |
683 | if (clhash->hash == NULL) | |
684 | return -ENOMEM; | |
685 | clhash->hashsize = size; | |
686 | clhash->hashmask = size - 1; | |
687 | clhash->hashelems = 0; | |
688 | return 0; | |
689 | } | |
690 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
691 | ||
692 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
693 | { | |
694 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
695 | } | |
696 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
697 | ||
698 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
699 | struct Qdisc_class_common *cl) | |
700 | { | |
701 | unsigned int h; | |
702 | ||
703 | INIT_HLIST_NODE(&cl->hnode); | |
704 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
705 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
706 | clhash->hashelems++; | |
707 | } | |
708 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
709 | ||
710 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
711 | struct Qdisc_class_common *cl) | |
712 | { | |
713 | hlist_del(&cl->hnode); | |
714 | clhash->hashelems--; | |
715 | } | |
716 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
717 | ||
fa0f5aa7 ED |
718 | /* Allocate an unique handle from space managed by kernel |
719 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
720 | */ | |
1da177e4 LT |
721 | static u32 qdisc_alloc_handle(struct net_device *dev) |
722 | { | |
fa0f5aa7 | 723 | int i = 0x8000; |
1da177e4 LT |
724 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
725 | ||
726 | do { | |
727 | autohandle += TC_H_MAKE(0x10000U, 0); | |
728 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
729 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
730 | if (!qdisc_lookup(dev, autohandle)) |
731 | return autohandle; | |
732 | cond_resched(); | |
733 | } while (--i > 0); | |
1da177e4 | 734 | |
fa0f5aa7 | 735 | return 0; |
1da177e4 LT |
736 | } |
737 | ||
2ccccf5f WC |
738 | void qdisc_tree_reduce_backlog(struct Qdisc *sch, unsigned int n, |
739 | unsigned int len) | |
43effa1e | 740 | { |
20fea08b | 741 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
742 | unsigned long cl; |
743 | u32 parentid; | |
2c8c8e6f | 744 | int drops; |
43effa1e | 745 | |
2ccccf5f | 746 | if (n == 0 && len == 0) |
43effa1e | 747 | return; |
2c8c8e6f | 748 | drops = max_t(int, n, 0); |
4eaf3b84 | 749 | rcu_read_lock(); |
43effa1e | 750 | while ((parentid = sch->parent)) { |
066a3b5b | 751 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 752 | break; |
066a3b5b | 753 | |
4eaf3b84 ED |
754 | if (sch->flags & TCQ_F_NOPARENT) |
755 | break; | |
756 | /* TODO: perform the search on a per txq basis */ | |
5ce2d488 | 757 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 758 | if (sch == NULL) { |
4eaf3b84 ED |
759 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
760 | break; | |
ffc8fefa | 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; | |
2ccccf5f | 769 | sch->qstats.backlog -= len; |
25331d6c | 770 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 771 | } |
4eaf3b84 | 772 | rcu_read_unlock(); |
43effa1e | 773 | } |
2ccccf5f | 774 | EXPORT_SYMBOL(qdisc_tree_reduce_backlog); |
1da177e4 | 775 | |
7316ae88 TG |
776 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
777 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
778 | struct Qdisc *old, struct Qdisc *new) |
779 | { | |
780 | if (new || old) | |
7316ae88 | 781 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 782 | |
4d8863a2 | 783 | if (old) |
99194cff | 784 | qdisc_destroy(old); |
99194cff DM |
785 | } |
786 | ||
787 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
788 | * to device "dev". | |
789 | * | |
790 | * When appropriate send a netlink notification using 'skb' | |
791 | * and "n". | |
792 | * | |
793 | * On success, destroy old qdisc. | |
1da177e4 LT |
794 | */ |
795 | ||
796 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
797 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
798 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 799 | { |
99194cff | 800 | struct Qdisc *q = old; |
7316ae88 | 801 | struct net *net = dev_net(dev); |
1da177e4 | 802 | int err = 0; |
1da177e4 | 803 | |
10297b99 | 804 | if (parent == NULL) { |
99194cff DM |
805 | unsigned int i, num_q, ingress; |
806 | ||
807 | ingress = 0; | |
808 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
809 | if ((q && q->flags & TCQ_F_INGRESS) || |
810 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
811 | num_q = 1; |
812 | ingress = 1; | |
24824a09 ED |
813 | if (!dev_ingress_queue(dev)) |
814 | return -ENOENT; | |
99194cff DM |
815 | } |
816 | ||
817 | if (dev->flags & IFF_UP) | |
818 | dev_deactivate(dev); | |
819 | ||
86e363dc WC |
820 | if (new && new->ops->attach) |
821 | goto skip; | |
6ec1c69a | 822 | |
99194cff | 823 | for (i = 0; i < num_q; i++) { |
24824a09 | 824 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
825 | |
826 | if (!ingress) | |
827 | dev_queue = netdev_get_tx_queue(dev, i); | |
828 | ||
8d50b53d DM |
829 | old = dev_graft_qdisc(dev_queue, new); |
830 | if (new && i > 0) | |
831 | atomic_inc(&new->refcnt); | |
832 | ||
036d6a67 JP |
833 | if (!ingress) |
834 | qdisc_destroy(old); | |
1da177e4 | 835 | } |
99194cff | 836 | |
86e363dc | 837 | skip: |
036d6a67 | 838 | if (!ingress) { |
7316ae88 TG |
839 | notify_and_destroy(net, skb, n, classid, |
840 | dev->qdisc, new); | |
036d6a67 JP |
841 | if (new && !new->ops->attach) |
842 | atomic_inc(&new->refcnt); | |
843 | dev->qdisc = new ? : &noop_qdisc; | |
86e363dc WC |
844 | |
845 | if (new && new->ops->attach) | |
846 | new->ops->attach(new); | |
036d6a67 | 847 | } else { |
7316ae88 | 848 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 849 | } |
af356afa | 850 | |
99194cff DM |
851 | if (dev->flags & IFF_UP) |
852 | dev_activate(dev); | |
1da177e4 | 853 | } else { |
20fea08b | 854 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 855 | |
c9f1d038 PM |
856 | err = -EOPNOTSUPP; |
857 | if (cops && cops->graft) { | |
1da177e4 LT |
858 | unsigned long cl = cops->get(parent, classid); |
859 | if (cl) { | |
99194cff | 860 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 861 | cops->put(parent, cl); |
c9f1d038 PM |
862 | } else |
863 | err = -ENOENT; | |
1da177e4 | 864 | } |
99194cff | 865 | if (!err) |
7316ae88 | 866 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
867 | } |
868 | return err; | |
869 | } | |
870 | ||
25bfcd5a JP |
871 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
872 | static struct lock_class_key qdisc_tx_lock; | |
873 | static struct lock_class_key qdisc_rx_lock; | |
874 | ||
1da177e4 LT |
875 | /* |
876 | Allocate and initialize new qdisc. | |
877 | ||
878 | Parameters are passed via opt. | |
879 | */ | |
880 | ||
5a7a5555 JHS |
881 | static struct Qdisc *qdisc_create(struct net_device *dev, |
882 | struct netdev_queue *dev_queue, | |
883 | struct Qdisc *p, u32 parent, u32 handle, | |
884 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
885 | { |
886 | int err; | |
1e90474c | 887 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
888 | struct Qdisc *sch; |
889 | struct Qdisc_ops *ops; | |
175f9c1b | 890 | struct qdisc_size_table *stab; |
1da177e4 LT |
891 | |
892 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 893 | #ifdef CONFIG_MODULES |
1da177e4 LT |
894 | if (ops == NULL && kind != NULL) { |
895 | char name[IFNAMSIZ]; | |
1e90474c | 896 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
897 | /* We dropped the RTNL semaphore in order to |
898 | * perform the module load. So, even if we | |
899 | * succeeded in loading the module we have to | |
900 | * tell the caller to replay the request. We | |
901 | * indicate this using -EAGAIN. | |
902 | * We replay the request because the device may | |
903 | * go away in the mean time. | |
904 | */ | |
905 | rtnl_unlock(); | |
906 | request_module("sch_%s", name); | |
907 | rtnl_lock(); | |
908 | ops = qdisc_lookup_ops(kind); | |
909 | if (ops != NULL) { | |
910 | /* We will try again qdisc_lookup_ops, | |
911 | * so don't keep a reference. | |
912 | */ | |
913 | module_put(ops->owner); | |
914 | err = -EAGAIN; | |
915 | goto err_out; | |
916 | } | |
917 | } | |
918 | } | |
919 | #endif | |
920 | ||
b9e2cc0f | 921 | err = -ENOENT; |
1da177e4 LT |
922 | if (ops == NULL) |
923 | goto err_out; | |
924 | ||
5ce2d488 | 925 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
926 | if (IS_ERR(sch)) { |
927 | err = PTR_ERR(sch); | |
1da177e4 | 928 | goto err_out2; |
3d54b82f | 929 | } |
1da177e4 | 930 | |
ffc8fefa PM |
931 | sch->parent = parent; |
932 | ||
3d54b82f | 933 | if (handle == TC_H_INGRESS) { |
1da177e4 | 934 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 935 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 936 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 937 | } else { |
fd44de7c PM |
938 | if (handle == 0) { |
939 | handle = qdisc_alloc_handle(dev); | |
940 | err = -ENOMEM; | |
941 | if (handle == 0) | |
942 | goto err_out3; | |
943 | } | |
25bfcd5a | 944 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1abbe139 | 945 | if (!netif_is_multiqueue(dev)) |
225734de | 946 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
947 | } |
948 | ||
3d54b82f | 949 | sch->handle = handle; |
1da177e4 | 950 | |
84c46dd8 JDB |
951 | /* This exist to keep backward compatible with a userspace |
952 | * loophole, what allowed userspace to get IFF_NO_QUEUE | |
953 | * facility on older kernels by setting tx_queue_len=0 (prior | |
954 | * to qdisc init), and then forgot to reinit tx_queue_len | |
955 | * before again attaching a qdisc. | |
956 | */ | |
957 | if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) { | |
958 | dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; | |
959 | netdev_info(dev, "Caught tx_queue_len zero misconfig\n"); | |
960 | } | |
961 | ||
1e90474c | 962 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
22e0f8b9 JF |
963 | if (qdisc_is_percpu_stats(sch)) { |
964 | sch->cpu_bstats = | |
7c1c97d5 | 965 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
22e0f8b9 JF |
966 | if (!sch->cpu_bstats) |
967 | goto err_out4; | |
b0ab6f92 JF |
968 | |
969 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
970 | if (!sch->cpu_qstats) | |
971 | goto err_out4; | |
22e0f8b9 JF |
972 | } |
973 | ||
175f9c1b JK |
974 | if (tca[TCA_STAB]) { |
975 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
976 | if (IS_ERR(stab)) { | |
977 | err = PTR_ERR(stab); | |
7c64b9f3 | 978 | goto err_out4; |
175f9c1b | 979 | } |
a2da570d | 980 | rcu_assign_pointer(sch->stab, stab); |
175f9c1b | 981 | } |
1e90474c | 982 | if (tca[TCA_RATE]) { |
edb09eb1 | 983 | seqcount_t *running; |
f6f9b93f | 984 | |
23bcf634 PM |
985 | err = -EOPNOTSUPP; |
986 | if (sch->flags & TCQ_F_MQROOT) | |
987 | goto err_out4; | |
988 | ||
f6f9b93f | 989 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
990 | !(sch->flags & TCQ_F_INGRESS) && |
991 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
edb09eb1 | 992 | running = qdisc_root_sleeping_running(sch); |
f6f9b93f | 993 | else |
edb09eb1 | 994 | running = &sch->running; |
f6f9b93f | 995 | |
22e0f8b9 JF |
996 | err = gen_new_estimator(&sch->bstats, |
997 | sch->cpu_bstats, | |
998 | &sch->rate_est, | |
edb09eb1 ED |
999 | NULL, |
1000 | running, | |
22e0f8b9 | 1001 | tca[TCA_RATE]); |
23bcf634 PM |
1002 | if (err) |
1003 | goto err_out4; | |
023e09a7 | 1004 | } |
f6e0b239 | 1005 | |
59cc1f61 | 1006 | qdisc_hash_add(sch); |
1da177e4 | 1007 | |
1da177e4 LT |
1008 | return sch; |
1009 | } | |
87b60cfa ED |
1010 | /* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */ |
1011 | ops->destroy(sch); | |
1da177e4 LT |
1012 | err_out3: |
1013 | dev_put(dev); | |
3d54b82f | 1014 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
1015 | err_out2: |
1016 | module_put(ops->owner); | |
1017 | err_out: | |
1018 | *errp = err; | |
1da177e4 | 1019 | return NULL; |
23bcf634 PM |
1020 | |
1021 | err_out4: | |
22e0f8b9 | 1022 | free_percpu(sch->cpu_bstats); |
b0ab6f92 | 1023 | free_percpu(sch->cpu_qstats); |
23bcf634 PM |
1024 | /* |
1025 | * Any broken qdiscs that would require a ops->reset() here? | |
1026 | * The qdisc was never in action so it shouldn't be necessary. | |
1027 | */ | |
a2da570d | 1028 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1029 | if (ops->destroy) |
1030 | ops->destroy(sch); | |
1031 | goto err_out3; | |
1da177e4 LT |
1032 | } |
1033 | ||
1e90474c | 1034 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 1035 | { |
a2da570d | 1036 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1037 | int err = 0; |
1da177e4 | 1038 | |
175f9c1b | 1039 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
1040 | if (sch->ops->change == NULL) |
1041 | return -EINVAL; | |
1e90474c | 1042 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
1043 | if (err) |
1044 | return err; | |
1045 | } | |
175f9c1b JK |
1046 | |
1047 | if (tca[TCA_STAB]) { | |
1048 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
1049 | if (IS_ERR(stab)) | |
1050 | return PTR_ERR(stab); | |
1051 | } | |
1052 | ||
a2da570d ED |
1053 | ostab = rtnl_dereference(sch->stab); |
1054 | rcu_assign_pointer(sch->stab, stab); | |
1055 | qdisc_put_stab(ostab); | |
175f9c1b | 1056 | |
23bcf634 | 1057 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1058 | /* NB: ignores errors from replace_estimator |
1059 | because change can't be undone. */ | |
23bcf634 PM |
1060 | if (sch->flags & TCQ_F_MQROOT) |
1061 | goto out; | |
22e0f8b9 JF |
1062 | gen_replace_estimator(&sch->bstats, |
1063 | sch->cpu_bstats, | |
1064 | &sch->rate_est, | |
edb09eb1 ED |
1065 | NULL, |
1066 | qdisc_root_sleeping_running(sch), | |
22e0f8b9 | 1067 | tca[TCA_RATE]); |
23bcf634 PM |
1068 | } |
1069 | out: | |
1da177e4 LT |
1070 | return 0; |
1071 | } | |
1072 | ||
cc7ec456 ED |
1073 | struct check_loop_arg { |
1074 | struct qdisc_walker w; | |
1da177e4 LT |
1075 | struct Qdisc *p; |
1076 | int depth; | |
1077 | }; | |
1078 | ||
5a7a5555 JHS |
1079 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, |
1080 | struct qdisc_walker *w); | |
1da177e4 LT |
1081 | |
1082 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1083 | { | |
1084 | struct check_loop_arg arg; | |
1085 | ||
1086 | if (q->ops->cl_ops == NULL) | |
1087 | return 0; | |
1088 | ||
1089 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1090 | arg.w.fn = check_loop_fn; | |
1091 | arg.depth = depth; | |
1092 | arg.p = p; | |
1093 | q->ops->cl_ops->walk(q, &arg.w); | |
1094 | return arg.w.stop ? -ELOOP : 0; | |
1095 | } | |
1096 | ||
1097 | static int | |
1098 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1099 | { | |
1100 | struct Qdisc *leaf; | |
20fea08b | 1101 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1102 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1103 | ||
1104 | leaf = cops->leaf(q, cl); | |
1105 | if (leaf) { | |
1106 | if (leaf == arg->p || arg->depth > 7) | |
1107 | return -ELOOP; | |
1108 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1109 | } | |
1110 | return 0; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Delete/get qdisc. | |
1115 | */ | |
1116 | ||
661d2967 | 1117 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1118 | { |
3b1e0a65 | 1119 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1120 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1121 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1122 | struct net_device *dev; |
de179c8c | 1123 | u32 clid; |
1da177e4 LT |
1124 | struct Qdisc *q = NULL; |
1125 | struct Qdisc *p = NULL; | |
1126 | int err; | |
1127 | ||
4e8bbb81 | 1128 | if ((n->nlmsg_type != RTM_GETQDISC) && |
5f013c9b | 1129 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1130 | return -EPERM; |
1131 | ||
1e90474c PM |
1132 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1133 | if (err < 0) | |
1134 | return err; | |
1135 | ||
de179c8c H |
1136 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1137 | if (!dev) | |
1138 | return -ENODEV; | |
1139 | ||
1140 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1141 | if (clid) { |
1142 | if (clid != TC_H_ROOT) { | |
1143 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 ED |
1144 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1145 | if (!p) | |
1da177e4 LT |
1146 | return -ENOENT; |
1147 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1148 | } else if (dev_ingress_queue(dev)) { |
1149 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1150 | } |
1da177e4 | 1151 | } else { |
af356afa | 1152 | q = dev->qdisc; |
1da177e4 LT |
1153 | } |
1154 | if (!q) | |
1155 | return -ENOENT; | |
1156 | ||
1157 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
1158 | return -EINVAL; | |
1159 | } else { | |
cc7ec456 ED |
1160 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1161 | if (!q) | |
1da177e4 LT |
1162 | return -ENOENT; |
1163 | } | |
1164 | ||
1e90474c | 1165 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1166 | return -EINVAL; |
1167 | ||
1168 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1169 | if (!clid) | |
1170 | return -EINVAL; | |
1171 | if (q->handle == 0) | |
1172 | return -ENOENT; | |
cc7ec456 ED |
1173 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
1174 | if (err != 0) | |
1da177e4 | 1175 | return err; |
1da177e4 | 1176 | } else { |
7316ae88 | 1177 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1178 | } |
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | /* | |
cc7ec456 | 1183 | * Create/change qdisc. |
1da177e4 LT |
1184 | */ |
1185 | ||
661d2967 | 1186 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1187 | { |
3b1e0a65 | 1188 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1189 | struct tcmsg *tcm; |
1e90474c | 1190 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1191 | struct net_device *dev; |
1192 | u32 clid; | |
1193 | struct Qdisc *q, *p; | |
1194 | int err; | |
1195 | ||
5f013c9b | 1196 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1197 | return -EPERM; |
1198 | ||
1da177e4 LT |
1199 | replay: |
1200 | /* Reinit, just in case something touches this. */ | |
de179c8c H |
1201 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1202 | if (err < 0) | |
1203 | return err; | |
1204 | ||
02ef22ca | 1205 | tcm = nlmsg_data(n); |
1da177e4 LT |
1206 | clid = tcm->tcm_parent; |
1207 | q = p = NULL; | |
1208 | ||
cc7ec456 ED |
1209 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1210 | if (!dev) | |
1da177e4 LT |
1211 | return -ENODEV; |
1212 | ||
1e90474c | 1213 | |
1da177e4 LT |
1214 | if (clid) { |
1215 | if (clid != TC_H_ROOT) { | |
1216 | if (clid != TC_H_INGRESS) { | |
cc7ec456 ED |
1217 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1218 | if (!p) | |
1da177e4 LT |
1219 | return -ENOENT; |
1220 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1221 | } else if (dev_ingress_queue_create(dev)) { |
1222 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1223 | } |
1224 | } else { | |
af356afa | 1225 | q = dev->qdisc; |
1da177e4 LT |
1226 | } |
1227 | ||
1228 | /* It may be default qdisc, ignore it */ | |
1229 | if (q && q->handle == 0) | |
1230 | q = NULL; | |
1231 | ||
1232 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1233 | if (tcm->tcm_handle) { | |
cc7ec456 | 1234 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
1da177e4 LT |
1235 | return -EEXIST; |
1236 | if (TC_H_MIN(tcm->tcm_handle)) | |
1237 | return -EINVAL; | |
cc7ec456 ED |
1238 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1239 | if (!q) | |
1da177e4 | 1240 | goto create_n_graft; |
cc7ec456 | 1241 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1242 | return -EEXIST; |
1e90474c | 1243 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1244 | return -EINVAL; |
1245 | if (q == p || | |
1246 | (p && check_loop(q, p, 0))) | |
1247 | return -ELOOP; | |
1248 | atomic_inc(&q->refcnt); | |
1249 | goto graft; | |
1250 | } else { | |
cc7ec456 | 1251 | if (!q) |
1da177e4 LT |
1252 | goto create_n_graft; |
1253 | ||
1254 | /* This magic test requires explanation. | |
1255 | * | |
1256 | * We know, that some child q is already | |
1257 | * attached to this parent and have choice: | |
1258 | * either to change it or to create/graft new one. | |
1259 | * | |
1260 | * 1. We are allowed to create/graft only | |
1261 | * if CREATE and REPLACE flags are set. | |
1262 | * | |
1263 | * 2. If EXCL is set, requestor wanted to say, | |
1264 | * that qdisc tcm_handle is not expected | |
1265 | * to exist, so that we choose create/graft too. | |
1266 | * | |
1267 | * 3. The last case is when no flags are set. | |
1268 | * Alas, it is sort of hole in API, we | |
1269 | * cannot decide what to do unambiguously. | |
1270 | * For now we select create/graft, if | |
1271 | * user gave KIND, which does not match existing. | |
1272 | */ | |
cc7ec456 ED |
1273 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1274 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1275 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1276 | (tca[TCA_KIND] && |
1277 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1278 | goto create_n_graft; |
1279 | } | |
1280 | } | |
1281 | } else { | |
1282 | if (!tcm->tcm_handle) | |
1283 | return -EINVAL; | |
1284 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1285 | } | |
1286 | ||
1287 | /* Change qdisc parameters */ | |
1288 | if (q == NULL) | |
1289 | return -ENOENT; | |
cc7ec456 | 1290 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1291 | return -EEXIST; |
1e90474c | 1292 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1293 | return -EINVAL; |
1294 | err = qdisc_change(q, tca); | |
1295 | if (err == 0) | |
7316ae88 | 1296 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1297 | return err; |
1298 | ||
1299 | create_n_graft: | |
cc7ec456 | 1300 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
1da177e4 | 1301 | return -ENOENT; |
24824a09 ED |
1302 | if (clid == TC_H_INGRESS) { |
1303 | if (dev_ingress_queue(dev)) | |
1304 | q = qdisc_create(dev, dev_ingress_queue(dev), p, | |
1305 | tcm->tcm_parent, tcm->tcm_parent, | |
1306 | tca, &err); | |
1307 | else | |
1308 | err = -ENOENT; | |
1309 | } else { | |
926e61b7 | 1310 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1311 | |
1312 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1313 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1314 | else if (p) | |
1315 | dev_queue = p->dev_queue; | |
1316 | else | |
1317 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1318 | |
926e61b7 | 1319 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1320 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1321 | tca, &err); |
6ec1c69a | 1322 | } |
1da177e4 LT |
1323 | if (q == NULL) { |
1324 | if (err == -EAGAIN) | |
1325 | goto replay; | |
1326 | return err; | |
1327 | } | |
1328 | ||
1329 | graft: | |
e5befbd9 IJ |
1330 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1331 | if (err) { | |
1332 | if (q) | |
1333 | qdisc_destroy(q); | |
1334 | return err; | |
1da177e4 | 1335 | } |
e5befbd9 | 1336 | |
1da177e4 LT |
1337 | return 0; |
1338 | } | |
1339 | ||
1340 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
15e47304 | 1341 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 | 1342 | { |
22e0f8b9 | 1343 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; |
b0ab6f92 | 1344 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; |
1da177e4 LT |
1345 | struct tcmsg *tcm; |
1346 | struct nlmsghdr *nlh; | |
27a884dc | 1347 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1348 | struct gnet_dump d; |
a2da570d | 1349 | struct qdisc_size_table *stab; |
64015853 | 1350 | __u32 qlen; |
1da177e4 | 1351 | |
fba373d2 | 1352 | cond_resched(); |
15e47304 | 1353 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1354 | if (!nlh) |
1355 | goto out_nlmsg_trim; | |
1356 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1357 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 PM |
1358 | tcm->tcm__pad1 = 0; |
1359 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1360 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1361 | tcm->tcm_parent = clid; |
1362 | tcm->tcm_handle = q->handle; | |
1363 | tcm->tcm_info = atomic_read(&q->refcnt); | |
1b34ec43 DM |
1364 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1365 | goto nla_put_failure; | |
1da177e4 | 1366 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1367 | goto nla_put_failure; |
64015853 | 1368 | qlen = q->q.qlen; |
1da177e4 | 1369 | |
a2da570d ED |
1370 | stab = rtnl_dereference(q->stab); |
1371 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
175f9c1b JK |
1372 | goto nla_put_failure; |
1373 | ||
102396ae | 1374 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
edb09eb1 | 1375 | NULL, &d, TCA_PAD) < 0) |
1e90474c | 1376 | goto nla_put_failure; |
1da177e4 LT |
1377 | |
1378 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1379 | goto nla_put_failure; |
1da177e4 | 1380 | |
b0ab6f92 | 1381 | if (qdisc_is_percpu_stats(q)) { |
22e0f8b9 | 1382 | cpu_bstats = q->cpu_bstats; |
b0ab6f92 JF |
1383 | cpu_qstats = q->cpu_qstats; |
1384 | } | |
22e0f8b9 | 1385 | |
edb09eb1 ED |
1386 | if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q), |
1387 | &d, cpu_bstats, &q->bstats) < 0 || | |
1c0d32fd | 1388 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
b0ab6f92 | 1389 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) |
1e90474c | 1390 | goto nla_put_failure; |
10297b99 | 1391 | |
1da177e4 | 1392 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1393 | goto nla_put_failure; |
10297b99 | 1394 | |
27a884dc | 1395 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1396 | return skb->len; |
1397 | ||
02ef22ca | 1398 | out_nlmsg_trim: |
1e90474c | 1399 | nla_put_failure: |
dc5fc579 | 1400 | nlmsg_trim(skb, b); |
1da177e4 LT |
1401 | return -1; |
1402 | } | |
1403 | ||
53b0f080 ED |
1404 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1405 | { | |
1406 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1407 | } | |
1408 | ||
7316ae88 TG |
1409 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1410 | struct nlmsghdr *n, u32 clid, | |
1411 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1412 | { |
1413 | struct sk_buff *skb; | |
15e47304 | 1414 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1415 | |
1416 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1417 | if (!skb) | |
1418 | return -ENOBUFS; | |
1419 | ||
53b0f080 | 1420 | if (old && !tc_qdisc_dump_ignore(old)) { |
15e47304 | 1421 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1422 | 0, RTM_DELQDISC) < 0) |
1da177e4 LT |
1423 | goto err_out; |
1424 | } | |
53b0f080 | 1425 | if (new && !tc_qdisc_dump_ignore(new)) { |
15e47304 | 1426 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1427 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
1da177e4 LT |
1428 | goto err_out; |
1429 | } | |
1430 | ||
1431 | if (skb->len) | |
15e47304 | 1432 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1433 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1434 | |
1435 | err_out: | |
1436 | kfree_skb(skb); | |
1437 | return -EINVAL; | |
1438 | } | |
1439 | ||
30723673 DM |
1440 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1441 | struct netlink_callback *cb, | |
ea327469 | 1442 | int *q_idx_p, int s_q_idx, bool recur) |
30723673 DM |
1443 | { |
1444 | int ret = 0, q_idx = *q_idx_p; | |
1445 | struct Qdisc *q; | |
59cc1f61 | 1446 | int b; |
30723673 DM |
1447 | |
1448 | if (!root) | |
1449 | return 0; | |
1450 | ||
1451 | q = root; | |
1452 | if (q_idx < s_q_idx) { | |
1453 | q_idx++; | |
1454 | } else { | |
1455 | if (!tc_qdisc_dump_ignore(q) && | |
15e47304 | 1456 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1457 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1458 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1459 | goto done; |
1460 | q_idx++; | |
1461 | } | |
69012ae4 | 1462 | |
ea327469 JK |
1463 | /* If dumping singletons, there is no qdisc_dev(root) and the singleton |
1464 | * itself has already been dumped. | |
1465 | * | |
1466 | * If we've already dumped the top-level (ingress) qdisc above and the global | |
1467 | * qdisc hashtable, we don't want to hit it again | |
1468 | */ | |
1469 | if (!qdisc_dev(root) || !recur) | |
69012ae4 JK |
1470 | goto out; |
1471 | ||
59cc1f61 | 1472 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1473 | if (q_idx < s_q_idx) { |
1474 | q_idx++; | |
1475 | continue; | |
1476 | } | |
cc7ec456 | 1477 | if (!tc_qdisc_dump_ignore(q) && |
15e47304 | 1478 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
5a7a5555 JHS |
1479 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1480 | RTM_NEWQDISC) <= 0) | |
30723673 DM |
1481 | goto done; |
1482 | q_idx++; | |
1483 | } | |
1484 | ||
1485 | out: | |
1486 | *q_idx_p = q_idx; | |
1487 | return ret; | |
1488 | done: | |
1489 | ret = -1; | |
1490 | goto out; | |
1491 | } | |
1492 | ||
1da177e4 LT |
1493 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1494 | { | |
3b1e0a65 | 1495 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1496 | int idx, q_idx; |
1497 | int s_idx, s_q_idx; | |
1498 | struct net_device *dev; | |
1da177e4 LT |
1499 | |
1500 | s_idx = cb->args[0]; | |
1501 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1502 | |
7562f876 | 1503 | idx = 0; |
15dc36eb ED |
1504 | ASSERT_RTNL(); |
1505 | for_each_netdev(net, dev) { | |
30723673 DM |
1506 | struct netdev_queue *dev_queue; |
1507 | ||
1da177e4 | 1508 | if (idx < s_idx) |
7562f876 | 1509 | goto cont; |
1da177e4 LT |
1510 | if (idx > s_idx) |
1511 | s_q_idx = 0; | |
1da177e4 | 1512 | q_idx = 0; |
30723673 | 1513 | |
5a7a5555 JHS |
1514 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx, |
1515 | true) < 0) | |
30723673 DM |
1516 | goto done; |
1517 | ||
24824a09 ED |
1518 | dev_queue = dev_ingress_queue(dev); |
1519 | if (dev_queue && | |
1520 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
ea327469 | 1521 | &q_idx, s_q_idx, false) < 0) |
30723673 DM |
1522 | goto done; |
1523 | ||
7562f876 PE |
1524 | cont: |
1525 | idx++; | |
1da177e4 LT |
1526 | } |
1527 | ||
1528 | done: | |
1da177e4 LT |
1529 | cb->args[0] = idx; |
1530 | cb->args[1] = q_idx; | |
1531 | ||
1532 | return skb->len; | |
1533 | } | |
1534 | ||
1535 | ||
1536 | ||
1537 | /************************************************ | |
1538 | * Traffic classes manipulation. * | |
1539 | ************************************************/ | |
1540 | ||
1541 | ||
1542 | ||
661d2967 | 1543 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1544 | { |
3b1e0a65 | 1545 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1546 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1547 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1548 | struct net_device *dev; |
1549 | struct Qdisc *q = NULL; | |
20fea08b | 1550 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1551 | unsigned long cl = 0; |
1552 | unsigned long new_cl; | |
de179c8c H |
1553 | u32 portid; |
1554 | u32 clid; | |
1555 | u32 qid; | |
1da177e4 LT |
1556 | int err; |
1557 | ||
4e8bbb81 | 1558 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
5f013c9b | 1559 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1560 | return -EPERM; |
1561 | ||
1e90474c PM |
1562 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1563 | if (err < 0) | |
1564 | return err; | |
1565 | ||
de179c8c H |
1566 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1567 | if (!dev) | |
1568 | return -ENODEV; | |
1569 | ||
1da177e4 LT |
1570 | /* |
1571 | parent == TC_H_UNSPEC - unspecified parent. | |
1572 | parent == TC_H_ROOT - class is root, which has no parent. | |
1573 | parent == X:0 - parent is root class. | |
1574 | parent == X:Y - parent is a node in hierarchy. | |
1575 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1576 | ||
1577 | handle == 0:0 - generate handle from kernel pool. | |
1578 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1579 | handle == X:Y - clear. | |
1580 | handle == X:0 - root class. | |
1581 | */ | |
1582 | ||
1583 | /* Step 1. Determine qdisc handle X:0 */ | |
1584 | ||
de179c8c H |
1585 | portid = tcm->tcm_parent; |
1586 | clid = tcm->tcm_handle; | |
1587 | qid = TC_H_MAJ(clid); | |
1588 | ||
15e47304 EB |
1589 | if (portid != TC_H_ROOT) { |
1590 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
1591 | |
1592 | if (qid && qid1) { | |
1593 | /* If both majors are known, they must be identical. */ | |
1594 | if (qid != qid1) | |
1595 | return -EINVAL; | |
1596 | } else if (qid1) { | |
1597 | qid = qid1; | |
1598 | } else if (qid == 0) | |
af356afa | 1599 | qid = dev->qdisc->handle; |
1da177e4 LT |
1600 | |
1601 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1602 | * both with parent and child. |
1603 | * | |
15e47304 | 1604 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 1605 | */ |
15e47304 EB |
1606 | if (portid) |
1607 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
1608 | } else { |
1609 | if (qid == 0) | |
af356afa | 1610 | qid = dev->qdisc->handle; |
1da177e4 LT |
1611 | } |
1612 | ||
1613 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1614 | q = qdisc_lookup(dev, qid); |
1615 | if (!q) | |
1da177e4 LT |
1616 | return -ENOENT; |
1617 | ||
1618 | /* An check that it supports classes */ | |
1619 | cops = q->ops->cl_ops; | |
1620 | if (cops == NULL) | |
1621 | return -EINVAL; | |
1622 | ||
1623 | /* Now try to get class */ | |
1624 | if (clid == 0) { | |
15e47304 | 1625 | if (portid == TC_H_ROOT) |
1da177e4 LT |
1626 | clid = qid; |
1627 | } else | |
1628 | clid = TC_H_MAKE(qid, clid); | |
1629 | ||
1630 | if (clid) | |
1631 | cl = cops->get(q, clid); | |
1632 | ||
1633 | if (cl == 0) { | |
1634 | err = -ENOENT; | |
cc7ec456 ED |
1635 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1636 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1637 | goto out; |
1638 | } else { | |
1639 | switch (n->nlmsg_type) { | |
10297b99 | 1640 | case RTM_NEWTCLASS: |
1da177e4 | 1641 | err = -EEXIST; |
cc7ec456 | 1642 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1643 | goto out; |
1644 | break; | |
1645 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1646 | err = -EOPNOTSUPP; |
1647 | if (cops->delete) | |
1648 | err = cops->delete(q, cl); | |
1da177e4 | 1649 | if (err == 0) |
5a7a5555 JHS |
1650 | tclass_notify(net, skb, n, q, cl, |
1651 | RTM_DELTCLASS); | |
1da177e4 LT |
1652 | goto out; |
1653 | case RTM_GETTCLASS: | |
7316ae88 | 1654 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1655 | goto out; |
1656 | default: | |
1657 | err = -EINVAL; | |
1658 | goto out; | |
1659 | } | |
1660 | } | |
1661 | ||
1662 | new_cl = cl; | |
de6d5cdf PM |
1663 | err = -EOPNOTSUPP; |
1664 | if (cops->change) | |
15e47304 | 1665 | err = cops->change(q, clid, portid, tca, &new_cl); |
1da177e4 | 1666 | if (err == 0) |
7316ae88 | 1667 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1668 | |
1669 | out: | |
1670 | if (cl) | |
1671 | cops->put(q, cl); | |
1672 | ||
1673 | return err; | |
1674 | } | |
1675 | ||
1676 | ||
1677 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1678 | unsigned long cl, | |
15e47304 | 1679 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1680 | { |
1681 | struct tcmsg *tcm; | |
1682 | struct nlmsghdr *nlh; | |
27a884dc | 1683 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1684 | struct gnet_dump d; |
20fea08b | 1685 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1686 | |
fba373d2 | 1687 | cond_resched(); |
15e47304 | 1688 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1689 | if (!nlh) |
1690 | goto out_nlmsg_trim; | |
1691 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1692 | tcm->tcm_family = AF_UNSPEC; |
16ebb5e0 ED |
1693 | tcm->tcm__pad1 = 0; |
1694 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1695 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1696 | tcm->tcm_parent = q->handle; |
1697 | tcm->tcm_handle = q->handle; | |
1698 | tcm->tcm_info = 0; | |
1b34ec43 DM |
1699 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1700 | goto nla_put_failure; | |
1da177e4 | 1701 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1702 | goto nla_put_failure; |
1da177e4 | 1703 | |
102396ae | 1704 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
edb09eb1 | 1705 | NULL, &d, TCA_PAD) < 0) |
1e90474c | 1706 | goto nla_put_failure; |
1da177e4 LT |
1707 | |
1708 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1709 | goto nla_put_failure; |
1da177e4 LT |
1710 | |
1711 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1712 | goto nla_put_failure; |
1da177e4 | 1713 | |
27a884dc | 1714 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1715 | return skb->len; |
1716 | ||
02ef22ca | 1717 | out_nlmsg_trim: |
1e90474c | 1718 | nla_put_failure: |
dc5fc579 | 1719 | nlmsg_trim(skb, b); |
1da177e4 LT |
1720 | return -1; |
1721 | } | |
1722 | ||
7316ae88 TG |
1723 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1724 | struct nlmsghdr *n, struct Qdisc *q, | |
1725 | unsigned long cl, int event) | |
1da177e4 LT |
1726 | { |
1727 | struct sk_buff *skb; | |
15e47304 | 1728 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1729 | |
1730 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1731 | if (!skb) | |
1732 | return -ENOBUFS; | |
1733 | ||
15e47304 | 1734 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { |
1da177e4 LT |
1735 | kfree_skb(skb); |
1736 | return -EINVAL; | |
1737 | } | |
1738 | ||
15e47304 | 1739 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1740 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1741 | } |
1742 | ||
cc7ec456 ED |
1743 | struct qdisc_dump_args { |
1744 | struct qdisc_walker w; | |
1745 | struct sk_buff *skb; | |
1746 | struct netlink_callback *cb; | |
1da177e4 LT |
1747 | }; |
1748 | ||
5a7a5555 JHS |
1749 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, |
1750 | struct qdisc_walker *arg) | |
1da177e4 LT |
1751 | { |
1752 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1753 | ||
15e47304 | 1754 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
5a7a5555 JHS |
1755 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1756 | RTM_NEWTCLASS); | |
1da177e4 LT |
1757 | } |
1758 | ||
30723673 DM |
1759 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1760 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1761 | int *t_p, int s_t) | |
1762 | { | |
1763 | struct qdisc_dump_args arg; | |
1764 | ||
1765 | if (tc_qdisc_dump_ignore(q) || | |
1766 | *t_p < s_t || !q->ops->cl_ops || | |
1767 | (tcm->tcm_parent && | |
1768 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1769 | (*t_p)++; | |
1770 | return 0; | |
1771 | } | |
1772 | if (*t_p > s_t) | |
1773 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1774 | arg.w.fn = qdisc_class_dump; | |
1775 | arg.skb = skb; | |
1776 | arg.cb = cb; | |
1777 | arg.w.stop = 0; | |
1778 | arg.w.skip = cb->args[1]; | |
1779 | arg.w.count = 0; | |
1780 | q->ops->cl_ops->walk(q, &arg.w); | |
1781 | cb->args[1] = arg.w.count; | |
1782 | if (arg.w.stop) | |
1783 | return -1; | |
1784 | (*t_p)++; | |
1785 | return 0; | |
1786 | } | |
1787 | ||
1788 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1789 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1790 | int *t_p, int s_t) | |
1791 | { | |
1792 | struct Qdisc *q; | |
59cc1f61 | 1793 | int b; |
30723673 DM |
1794 | |
1795 | if (!root) | |
1796 | return 0; | |
1797 | ||
1798 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1799 | return -1; | |
1800 | ||
69012ae4 JK |
1801 | if (!qdisc_dev(root)) |
1802 | return 0; | |
1803 | ||
59cc1f61 | 1804 | hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) { |
30723673 DM |
1805 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
1806 | return -1; | |
1807 | } | |
1808 | ||
1809 | return 0; | |
1810 | } | |
1811 | ||
1da177e4 LT |
1812 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1813 | { | |
02ef22ca | 1814 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 1815 | struct net *net = sock_net(skb->sk); |
30723673 | 1816 | struct netdev_queue *dev_queue; |
1da177e4 | 1817 | struct net_device *dev; |
30723673 | 1818 | int t, s_t; |
1da177e4 | 1819 | |
573ce260 | 1820 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1821 | return 0; |
cc7ec456 ED |
1822 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
1823 | if (!dev) | |
1da177e4 LT |
1824 | return 0; |
1825 | ||
1826 | s_t = cb->args[0]; | |
1827 | t = 0; | |
1828 | ||
af356afa | 1829 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1830 | goto done; |
1831 | ||
24824a09 ED |
1832 | dev_queue = dev_ingress_queue(dev); |
1833 | if (dev_queue && | |
1834 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
1835 | &t, s_t) < 0) | |
30723673 | 1836 | goto done; |
1da177e4 | 1837 | |
30723673 | 1838 | done: |
1da177e4 LT |
1839 | cb->args[0] = t; |
1840 | ||
1841 | dev_put(dev); | |
1842 | return skb->len; | |
1843 | } | |
1844 | ||
1845 | /* Main classifier routine: scans classifier chain attached | |
cc7ec456 ED |
1846 | * to this qdisc, (optionally) tests for protocol and asks |
1847 | * specific classifiers. | |
1da177e4 | 1848 | */ |
3b3ae880 DB |
1849 | int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1850 | struct tcf_result *res, bool compat_mode) | |
73ca4918 | 1851 | { |
d8b9605d | 1852 | __be16 protocol = tc_skb_protocol(skb); |
3b3ae880 | 1853 | #ifdef CONFIG_NET_CLS_ACT |
d6264071 | 1854 | const int max_reclassify_loop = 4; |
3b3ae880 DB |
1855 | const struct tcf_proto *old_tp = tp; |
1856 | int limit = 0; | |
73ca4918 | 1857 | |
3b3ae880 DB |
1858 | reclassify: |
1859 | #endif | |
25d8c0d5 | 1860 | for (; tp; tp = rcu_dereference_bh(tp->next)) { |
3b3ae880 DB |
1861 | int err; |
1862 | ||
cc7ec456 ED |
1863 | if (tp->protocol != protocol && |
1864 | tp->protocol != htons(ETH_P_ALL)) | |
1865 | continue; | |
cc7ec456 | 1866 | |
3b3ae880 DB |
1867 | err = tp->classify(skb, tp, res); |
1868 | #ifdef CONFIG_NET_CLS_ACT | |
c1b3b199 | 1869 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) |
3b3ae880 DB |
1870 | goto reset; |
1871 | #endif | |
e578d9c0 | 1872 | if (err >= 0) |
73ca4918 | 1873 | return err; |
73ca4918 | 1874 | } |
73ca4918 | 1875 | |
7e6e18fb | 1876 | return TC_ACT_UNSPEC; /* signal: continue lookup */ |
1da177e4 | 1877 | #ifdef CONFIG_NET_CLS_ACT |
3b3ae880 | 1878 | reset: |
d6264071 | 1879 | if (unlikely(limit++ >= max_reclassify_loop)) { |
c1b3b199 DB |
1880 | net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", |
1881 | tp->q->ops->id, tp->prio & 0xffff, | |
1882 | ntohs(tp->protocol)); | |
3b3ae880 | 1883 | return TC_ACT_SHOT; |
1da177e4 | 1884 | } |
3b3ae880 DB |
1885 | |
1886 | tp = old_tp; | |
619fe326 | 1887 | protocol = tc_skb_protocol(skb); |
3b3ae880 | 1888 | goto reclassify; |
73ca4918 | 1889 | #endif |
1da177e4 | 1890 | } |
73ca4918 | 1891 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1892 | |
1da177e4 LT |
1893 | #ifdef CONFIG_PROC_FS |
1894 | static int psched_show(struct seq_file *seq, void *v) | |
1895 | { | |
1896 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 1897 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1898 | 1000000, |
1e317688 | 1899 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
1900 | |
1901 | return 0; | |
1902 | } | |
1903 | ||
1904 | static int psched_open(struct inode *inode, struct file *file) | |
1905 | { | |
7e5ab157 | 1906 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1907 | } |
1908 | ||
da7071d7 | 1909 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1910 | .owner = THIS_MODULE, |
1911 | .open = psched_open, | |
1912 | .read = seq_read, | |
1913 | .llseek = seq_lseek, | |
1914 | .release = single_release, | |
10297b99 | 1915 | }; |
7316ae88 TG |
1916 | |
1917 | static int __net_init psched_net_init(struct net *net) | |
1918 | { | |
1919 | struct proc_dir_entry *e; | |
1920 | ||
d4beaa66 | 1921 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
7316ae88 TG |
1922 | if (e == NULL) |
1923 | return -ENOMEM; | |
1924 | ||
1925 | return 0; | |
1926 | } | |
1927 | ||
1928 | static void __net_exit psched_net_exit(struct net *net) | |
1929 | { | |
ece31ffd | 1930 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
1931 | } |
1932 | #else | |
1933 | static int __net_init psched_net_init(struct net *net) | |
1934 | { | |
1935 | return 0; | |
1936 | } | |
1937 | ||
1938 | static void __net_exit psched_net_exit(struct net *net) | |
1939 | { | |
1940 | } | |
1da177e4 LT |
1941 | #endif |
1942 | ||
7316ae88 TG |
1943 | static struct pernet_operations psched_net_ops = { |
1944 | .init = psched_net_init, | |
1945 | .exit = psched_net_exit, | |
1946 | }; | |
1947 | ||
1da177e4 LT |
1948 | static int __init pktsched_init(void) |
1949 | { | |
7316ae88 TG |
1950 | int err; |
1951 | ||
1952 | err = register_pernet_subsys(&psched_net_ops); | |
1953 | if (err) { | |
cc7ec456 | 1954 | pr_err("pktsched_init: " |
7316ae88 TG |
1955 | "cannot initialize per netns operations\n"); |
1956 | return err; | |
1957 | } | |
1958 | ||
6da7c8fc | 1959 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
1960 | register_qdisc(&pfifo_qdisc_ops); |
1961 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1962 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1963 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 1964 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 1965 | |
c7ac8679 GR |
1966 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL); |
1967 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL); | |
5a7a5555 JHS |
1968 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, |
1969 | NULL); | |
c7ac8679 GR |
1970 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL); |
1971 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL); | |
5a7a5555 JHS |
1972 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, |
1973 | NULL); | |
be577ddc | 1974 | |
1da177e4 LT |
1975 | return 0; |
1976 | } | |
1977 | ||
1978 | subsys_initcall(pktsched_init); |