blob: 3d8981fde3019ae09130528c3f08e4d632385f2f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#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>
Patrick McHardy41794772007-03-16 01:19:15 -070029#include <linux/hrtimer.h>
Jarek Poplawski25bfcd52008-08-18 20:53:34 -070030#include <linux/lockdep.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020033#include <net/net_namespace.h>
Denis V. Lunevb8542722007-12-01 00:21:31 +110034#include <net/sock.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070035#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <net/pkt_sched.h>
37
Tom Goff7316ae82010-03-19 15:40:13 +000038static int qdisc_notify(struct net *net, struct sk_buff *oskb,
39 struct nlmsghdr *n, u32 clid,
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 struct Qdisc *old, struct Qdisc *new);
Tom Goff7316ae82010-03-19 15:40:13 +000041static int tclass_notify(struct net *net, struct sk_buff *oskb,
42 struct nlmsghdr *n, struct Qdisc *q,
43 unsigned long cl, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45/*
46
47 Short review.
48 -------------
49
50 This file consists of two interrelated parts:
51
52 1. queueing disciplines manager frontend.
53 2. traffic classes manager frontend.
54
55 Generally, queueing discipline ("qdisc") is a black box,
56 which is able to enqueue packets and to dequeue them (when
57 device is ready to send something) in order and at times
58 determined by algorithm hidden in it.
59
60 qdisc's are divided to two categories:
61 - "queues", which have no internal structure visible from outside.
62 - "schedulers", which split all the packets to "traffic classes",
63 using "packet classifiers" (look at cls_api.c)
64
65 In turn, classes may have child qdiscs (as rule, queues)
66 attached to them etc. etc. etc.
67
68 The goal of the routines in this file is to translate
69 information supplied by user in the form of handles
70 to more intelligible for kernel form, to make some sanity
71 checks and part of work, which is common to all qdiscs
72 and to provide rtnetlink notifications.
73
74 All real intelligent work is done inside qdisc modules.
75
76
77
78 Every discipline has two major routines: enqueue and dequeue.
79
80 ---dequeue
81
82 dequeue usually returns a skb to send. It is allowed to return NULL,
83 but it does not mean that queue is empty, it just means that
84 discipline does not want to send anything this time.
85 Queue is really empty if q->q.qlen == 0.
86 For complicated disciplines with multiple queues q->q is not
87 real packet queue, but however q->q.qlen must be valid.
88
89 ---enqueue
90
91 enqueue returns 0, if packet was enqueued successfully.
92 If packet (this one or another one) was dropped, it returns
93 not zero error code.
94 NET_XMIT_DROP - this packet dropped
95 Expected action: do not backoff, but wait until queue will clear.
96 NET_XMIT_CN - probably this packet enqueued, but another one dropped.
97 Expected action: backoff or ignore
98 NET_XMIT_POLICED - dropped by police.
99 Expected action: backoff or error to real-time apps.
100
101 Auxiliary routines:
102
Jarek Poplawski99c0db22008-10-31 00:45:27 -0700103 ---peek
104
105 like dequeue but without removing a packet from the queue
106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 ---reset
108
109 returns qdisc to initial state: purge all buffers, clear all
110 timers, counters (except for statistics) etc.
111
112 ---init
113
114 initializes newly created qdisc.
115
116 ---destroy
117
118 destroys resources allocated by init and during lifetime of qdisc.
119
120 ---change
121
122 changes qdisc parameters.
123 */
124
125/* Protects list of registered TC modules. It is pure SMP lock. */
126static DEFINE_RWLOCK(qdisc_mod_lock);
127
128
129/************************************************
130 * Queueing disciplines manipulation. *
131 ************************************************/
132
133
134/* The list of all installed queueing disciplines. */
135
136static struct Qdisc_ops *qdisc_base;
137
138/* Register/uregister queueing discipline */
139
140int register_qdisc(struct Qdisc_ops *qops)
141{
142 struct Qdisc_ops *q, **qp;
143 int rc = -EEXIST;
144
145 write_lock(&qdisc_mod_lock);
146 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
147 if (!strcmp(qops->id, q->id))
148 goto out;
149
150 if (qops->enqueue == NULL)
151 qops->enqueue = noop_qdisc_ops.enqueue;
Jarek Poplawski99c0db22008-10-31 00:45:27 -0700152 if (qops->peek == NULL) {
Jarek Poplawski68fd26b2010-08-09 12:18:48 +0000153 if (qops->dequeue == NULL)
Jarek Poplawski99c0db22008-10-31 00:45:27 -0700154 qops->peek = noop_qdisc_ops.peek;
Jarek Poplawski68fd26b2010-08-09 12:18:48 +0000155 else
156 goto out_einval;
Jarek Poplawski99c0db22008-10-31 00:45:27 -0700157 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 if (qops->dequeue == NULL)
159 qops->dequeue = noop_qdisc_ops.dequeue;
160
Jarek Poplawski68fd26b2010-08-09 12:18:48 +0000161 if (qops->cl_ops) {
162 const struct Qdisc_class_ops *cops = qops->cl_ops;
163
Jarek Poplawski3e9e5a52010-08-10 22:31:20 +0000164 if (!(cops->get && cops->put && cops->walk && cops->leaf))
Jarek Poplawski68fd26b2010-08-09 12:18:48 +0000165 goto out_einval;
166
167 if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf))
168 goto out_einval;
169 }
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 qops->next = NULL;
172 *qp = qops;
173 rc = 0;
174out:
175 write_unlock(&qdisc_mod_lock);
176 return rc;
Jarek Poplawski68fd26b2010-08-09 12:18:48 +0000177
178out_einval:
179 rc = -EINVAL;
180 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800182EXPORT_SYMBOL(register_qdisc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184int unregister_qdisc(struct Qdisc_ops *qops)
185{
186 struct Qdisc_ops *q, **qp;
187 int err = -ENOENT;
188
189 write_lock(&qdisc_mod_lock);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000190 for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (q == qops)
192 break;
193 if (q) {
194 *qp = q->next;
195 q->next = NULL;
196 err = 0;
197 }
198 write_unlock(&qdisc_mod_lock);
199 return err;
200}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800201EXPORT_SYMBOL(unregister_qdisc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203/* We know handle. Find qdisc among all qdisc's attached to device
204 (root qdisc, all its children, children of children etc.)
205 */
206
Hannes Eder6113b742008-11-28 03:06:46 -0800207static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
David S. Miller8123b422008-08-08 23:23:39 -0700208{
209 struct Qdisc *q;
210
211 if (!(root->flags & TCQ_F_BUILTIN) &&
212 root->handle == handle)
213 return root;
214
215 list_for_each_entry(q, &root->list, list) {
216 if (q->handle == handle)
217 return q;
218 }
219 return NULL;
220}
221
Jarek Poplawskif6e0b232008-08-22 03:24:05 -0700222static void qdisc_list_add(struct Qdisc *q)
223{
Jarek Poplawskif6486d42008-11-25 13:56:06 -0800224 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
Patrick McHardyaf356af2009-09-04 06:41:18 +0000225 list_add_tail(&q->list, &qdisc_dev(q)->qdisc->list);
Jarek Poplawskif6e0b232008-08-22 03:24:05 -0700226}
227
228void qdisc_list_del(struct Qdisc *q)
229{
Jarek Poplawskif6486d42008-11-25 13:56:06 -0800230 if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
Jarek Poplawskif6e0b232008-08-22 03:24:05 -0700231 list_del(&q->list);
Jarek Poplawskif6e0b232008-08-22 03:24:05 -0700232}
233EXPORT_SYMBOL(qdisc_list_del);
234
David S. Milleread81cc2008-07-17 00:50:32 -0700235struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
Patrick McHardy43effa12006-11-29 17:35:48 -0800236{
Jarek Poplawskif6e0b232008-08-22 03:24:05 -0700237 struct Qdisc *q;
238
Patrick McHardyaf356af2009-09-04 06:41:18 +0000239 q = qdisc_match_from_root(dev->qdisc, handle);
240 if (q)
241 goto out;
Jarek Poplawskif6e0b232008-08-22 03:24:05 -0700242
Eric Dumazet24824a02010-10-02 06:11:55 +0000243 if (dev_ingress_queue(dev))
244 q = qdisc_match_from_root(
245 dev_ingress_queue(dev)->qdisc_sleeping,
246 handle);
Jarek Poplawskif6486d42008-11-25 13:56:06 -0800247out:
Jarek Poplawskif6e0b232008-08-22 03:24:05 -0700248 return q;
Patrick McHardy43effa12006-11-29 17:35:48 -0800249}
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
252{
253 unsigned long cl;
254 struct Qdisc *leaf;
Eric Dumazet20fea082007-11-14 01:44:41 -0800255 const struct Qdisc_class_ops *cops = p->ops->cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 if (cops == NULL)
258 return NULL;
259 cl = cops->get(p, classid);
260
261 if (cl == 0)
262 return NULL;
263 leaf = cops->leaf(p, cl);
264 cops->put(p, cl);
265 return leaf;
266}
267
268/* Find queueing discipline by name */
269
Patrick McHardy1e904742008-01-22 22:11:17 -0800270static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271{
272 struct Qdisc_ops *q = NULL;
273
274 if (kind) {
275 read_lock(&qdisc_mod_lock);
276 for (q = qdisc_base; q; q = q->next) {
Patrick McHardy1e904742008-01-22 22:11:17 -0800277 if (nla_strcmp(kind, q->id) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 if (!try_module_get(q->owner))
279 q = NULL;
280 break;
281 }
282 }
283 read_unlock(&qdisc_mod_lock);
284 }
285 return q;
286}
287
288static struct qdisc_rate_table *qdisc_rtab_list;
289
Patrick McHardy1e904742008-01-22 22:11:17 -0800290struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
292 struct qdisc_rate_table *rtab;
293
294 for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
295 if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) {
296 rtab->refcnt++;
297 return rtab;
298 }
299 }
300
Patrick McHardy5feb5e12008-01-23 20:35:19 -0800301 if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
302 nla_len(tab) != TC_RTAB_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 return NULL;
304
305 rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
306 if (rtab) {
307 rtab->rate = *r;
308 rtab->refcnt = 1;
Patrick McHardy1e904742008-01-22 22:11:17 -0800309 memcpy(rtab->data, nla_data(tab), 1024);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 rtab->next = qdisc_rtab_list;
311 qdisc_rtab_list = rtab;
312 }
313 return rtab;
314}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800315EXPORT_SYMBOL(qdisc_get_rtab);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317void qdisc_put_rtab(struct qdisc_rate_table *tab)
318{
319 struct qdisc_rate_table *rtab, **rtabp;
320
321 if (!tab || --tab->refcnt)
322 return;
323
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000324 for (rtabp = &qdisc_rtab_list;
325 (rtab = *rtabp) != NULL;
326 rtabp = &rtab->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 if (rtab == tab) {
328 *rtabp = rtab->next;
329 kfree(rtab);
330 return;
331 }
332 }
333}
Patrick McHardy62e3ba12008-01-22 22:10:23 -0800334EXPORT_SYMBOL(qdisc_put_rtab);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700336static LIST_HEAD(qdisc_stab_list);
337static DEFINE_SPINLOCK(qdisc_stab_lock);
338
339static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
340 [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
341 [TCA_STAB_DATA] = { .type = NLA_BINARY },
342};
343
344static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
345{
346 struct nlattr *tb[TCA_STAB_MAX + 1];
347 struct qdisc_size_table *stab;
348 struct tc_sizespec *s;
349 unsigned int tsize = 0;
350 u16 *tab = NULL;
351 int err;
352
353 err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy);
354 if (err < 0)
355 return ERR_PTR(err);
356 if (!tb[TCA_STAB_BASE])
357 return ERR_PTR(-EINVAL);
358
359 s = nla_data(tb[TCA_STAB_BASE]);
360
361 if (s->tsize > 0) {
362 if (!tb[TCA_STAB_DATA])
363 return ERR_PTR(-EINVAL);
364 tab = nla_data(tb[TCA_STAB_DATA]);
365 tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
366 }
367
Dan Carpenter00093fa2010-08-14 11:09:49 +0000368 if (tsize != s->tsize || (!tab && tsize > 0))
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700369 return ERR_PTR(-EINVAL);
370
David S. Millerf3b96052008-08-18 22:33:05 -0700371 spin_lock(&qdisc_stab_lock);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700372
373 list_for_each_entry(stab, &qdisc_stab_list, list) {
374 if (memcmp(&stab->szopts, s, sizeof(*s)))
375 continue;
376 if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
377 continue;
378 stab->refcnt++;
David S. Millerf3b96052008-08-18 22:33:05 -0700379 spin_unlock(&qdisc_stab_lock);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700380 return stab;
381 }
382
David S. Millerf3b96052008-08-18 22:33:05 -0700383 spin_unlock(&qdisc_stab_lock);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700384
385 stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
386 if (!stab)
387 return ERR_PTR(-ENOMEM);
388
389 stab->refcnt = 1;
390 stab->szopts = *s;
391 if (tsize > 0)
392 memcpy(stab->data, tab, tsize * sizeof(u16));
393
David S. Millerf3b96052008-08-18 22:33:05 -0700394 spin_lock(&qdisc_stab_lock);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700395 list_add_tail(&stab->list, &qdisc_stab_list);
David S. Millerf3b96052008-08-18 22:33:05 -0700396 spin_unlock(&qdisc_stab_lock);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700397
398 return stab;
399}
400
Eric Dumazeta2da5702011-01-20 03:48:19 +0000401static void stab_kfree_rcu(struct rcu_head *head)
402{
403 kfree(container_of(head, struct qdisc_size_table, rcu));
404}
405
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700406void qdisc_put_stab(struct qdisc_size_table *tab)
407{
408 if (!tab)
409 return;
410
David S. Millerf3b96052008-08-18 22:33:05 -0700411 spin_lock(&qdisc_stab_lock);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700412
413 if (--tab->refcnt == 0) {
414 list_del(&tab->list);
Eric Dumazeta2da5702011-01-20 03:48:19 +0000415 call_rcu_bh(&tab->rcu, stab_kfree_rcu);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700416 }
417
David S. Millerf3b96052008-08-18 22:33:05 -0700418 spin_unlock(&qdisc_stab_lock);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700419}
420EXPORT_SYMBOL(qdisc_put_stab);
421
422static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
423{
424 struct nlattr *nest;
425
426 nest = nla_nest_start(skb, TCA_STAB);
Patrick McHardy3aa46142008-11-20 04:07:14 -0800427 if (nest == NULL)
428 goto nla_put_failure;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700429 NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts);
430 nla_nest_end(skb, nest);
431
432 return skb->len;
433
434nla_put_failure:
435 return -1;
436}
437
Eric Dumazeta2da5702011-01-20 03:48:19 +0000438void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab)
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700439{
440 int pkt_len, slot;
441
442 pkt_len = skb->len + stab->szopts.overhead;
443 if (unlikely(!stab->szopts.tsize))
444 goto out;
445
446 slot = pkt_len + stab->szopts.cell_align;
447 if (unlikely(slot < 0))
448 slot = 0;
449
450 slot >>= stab->szopts.cell_log;
451 if (likely(slot < stab->szopts.tsize))
452 pkt_len = stab->data[slot];
453 else
454 pkt_len = stab->data[stab->szopts.tsize - 1] *
455 (slot / stab->szopts.tsize) +
456 stab->data[slot % stab->szopts.tsize];
457
458 pkt_len <<= stab->szopts.size_log;
459out:
460 if (unlikely(pkt_len < 1))
461 pkt_len = 1;
462 qdisc_skb_cb(skb)->pkt_len = pkt_len;
463}
Eric Dumazeta2da5702011-01-20 03:48:19 +0000464EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700465
Jarek Poplawskib00355d2009-02-01 01:12:42 -0800466void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc)
467{
468 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000469 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
470 txt, qdisc->ops->id, qdisc->handle >> 16);
Jarek Poplawskib00355d2009-02-01 01:12:42 -0800471 qdisc->flags |= TCQ_F_WARN_NONWC;
472 }
473}
474EXPORT_SYMBOL(qdisc_warn_nonwc);
475
Patrick McHardy41794772007-03-16 01:19:15 -0700476static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
477{
478 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
David S. Miller2fbd3da2009-09-01 17:59:25 -0700479 timer);
Patrick McHardy41794772007-03-16 01:19:15 -0700480
Eric Dumazetfd245a42011-01-20 05:27:16 +0000481 qdisc_unthrottled(wd->qdisc);
David S. Miller8608db02008-08-18 20:51:18 -0700482 __netif_schedule(qdisc_root(wd->qdisc));
Stephen Hemminger19365022007-03-22 12:18:35 -0700483
Patrick McHardy41794772007-03-16 01:19:15 -0700484 return HRTIMER_NORESTART;
485}
486
487void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
488{
David S. Miller2fbd3da2009-09-01 17:59:25 -0700489 hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
490 wd->timer.function = qdisc_watchdog;
Patrick McHardy41794772007-03-16 01:19:15 -0700491 wd->qdisc = qdisc;
492}
493EXPORT_SYMBOL(qdisc_watchdog_init);
494
495void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires)
496{
497 ktime_t time;
498
Jarek Poplawski2540e052008-08-21 05:11:14 -0700499 if (test_bit(__QDISC_STATE_DEACTIVATED,
500 &qdisc_root_sleeping(wd->qdisc)->state))
501 return;
502
Eric Dumazetfd245a42011-01-20 05:27:16 +0000503 qdisc_throttled(wd->qdisc);
Patrick McHardy41794772007-03-16 01:19:15 -0700504 time = ktime_set(0, 0);
Jarek Poplawskica44d6e2009-06-15 02:31:47 -0700505 time = ktime_add_ns(time, PSCHED_TICKS2NS(expires));
David S. Miller2fbd3da2009-09-01 17:59:25 -0700506 hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS);
Patrick McHardy41794772007-03-16 01:19:15 -0700507}
508EXPORT_SYMBOL(qdisc_watchdog_schedule);
509
510void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
511{
David S. Miller2fbd3da2009-09-01 17:59:25 -0700512 hrtimer_cancel(&wd->timer);
Eric Dumazetfd245a42011-01-20 05:27:16 +0000513 qdisc_unthrottled(wd->qdisc);
Patrick McHardy41794772007-03-16 01:19:15 -0700514}
515EXPORT_SYMBOL(qdisc_watchdog_cancel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Adrian Bunka94f7792008-07-22 14:20:11 -0700517static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700518{
519 unsigned int size = n * sizeof(struct hlist_head), i;
520 struct hlist_head *h;
521
522 if (size <= PAGE_SIZE)
523 h = kmalloc(size, GFP_KERNEL);
524 else
525 h = (struct hlist_head *)
526 __get_free_pages(GFP_KERNEL, get_order(size));
527
528 if (h != NULL) {
529 for (i = 0; i < n; i++)
530 INIT_HLIST_HEAD(&h[i]);
531 }
532 return h;
533}
534
535static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n)
536{
537 unsigned int size = n * sizeof(struct hlist_head);
538
539 if (size <= PAGE_SIZE)
540 kfree(h);
541 else
542 free_pages((unsigned long)h, get_order(size));
543}
544
545void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
546{
547 struct Qdisc_class_common *cl;
548 struct hlist_node *n, *next;
549 struct hlist_head *nhash, *ohash;
550 unsigned int nsize, nmask, osize;
551 unsigned int i, h;
552
553 /* Rehash when load factor exceeds 0.75 */
554 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
555 return;
556 nsize = clhash->hashsize * 2;
557 nmask = nsize - 1;
558 nhash = qdisc_class_hash_alloc(nsize);
559 if (nhash == NULL)
560 return;
561
562 ohash = clhash->hash;
563 osize = clhash->hashsize;
564
565 sch_tree_lock(sch);
566 for (i = 0; i < osize; i++) {
567 hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) {
568 h = qdisc_class_hash(cl->classid, nmask);
569 hlist_add_head(&cl->hnode, &nhash[h]);
570 }
571 }
572 clhash->hash = nhash;
573 clhash->hashsize = nsize;
574 clhash->hashmask = nmask;
575 sch_tree_unlock(sch);
576
577 qdisc_class_hash_free(ohash, osize);
578}
579EXPORT_SYMBOL(qdisc_class_hash_grow);
580
581int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
582{
583 unsigned int size = 4;
584
585 clhash->hash = qdisc_class_hash_alloc(size);
586 if (clhash->hash == NULL)
587 return -ENOMEM;
588 clhash->hashsize = size;
589 clhash->hashmask = size - 1;
590 clhash->hashelems = 0;
591 return 0;
592}
593EXPORT_SYMBOL(qdisc_class_hash_init);
594
595void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
596{
597 qdisc_class_hash_free(clhash->hash, clhash->hashsize);
598}
599EXPORT_SYMBOL(qdisc_class_hash_destroy);
600
601void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
602 struct Qdisc_class_common *cl)
603{
604 unsigned int h;
605
606 INIT_HLIST_NODE(&cl->hnode);
607 h = qdisc_class_hash(cl->classid, clhash->hashmask);
608 hlist_add_head(&cl->hnode, &clhash->hash[h]);
609 clhash->hashelems++;
610}
611EXPORT_SYMBOL(qdisc_class_hash_insert);
612
613void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
614 struct Qdisc_class_common *cl)
615{
616 hlist_del(&cl->hnode);
617 clhash->hashelems--;
618}
619EXPORT_SYMBOL(qdisc_class_hash_remove);
620
Eric Dumazetfa0f5aa2012-01-03 00:00:11 +0000621/* Allocate an unique handle from space managed by kernel
622 * Possible range is [8000-FFFF]:0000 (0x8000 values)
623 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624static u32 qdisc_alloc_handle(struct net_device *dev)
625{
Eric Dumazetfa0f5aa2012-01-03 00:00:11 +0000626 int i = 0x8000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
628
629 do {
630 autohandle += TC_H_MAKE(0x10000U, 0);
631 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
632 autohandle = TC_H_MAKE(0x80000000U, 0);
Eric Dumazetfa0f5aa2012-01-03 00:00:11 +0000633 if (!qdisc_lookup(dev, autohandle))
634 return autohandle;
635 cond_resched();
636 } while (--i > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Eric Dumazetfa0f5aa2012-01-03 00:00:11 +0000638 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639}
640
Patrick McHardy43effa12006-11-29 17:35:48 -0800641void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
642{
Eric Dumazet20fea082007-11-14 01:44:41 -0800643 const struct Qdisc_class_ops *cops;
Patrick McHardy43effa12006-11-29 17:35:48 -0800644 unsigned long cl;
645 u32 parentid;
646
647 if (n == 0)
648 return;
649 while ((parentid = sch->parent)) {
Jarek Poplawski066a3b52008-04-14 15:10:42 -0700650 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
651 return;
652
David S. Miller5ce2d482008-07-08 17:06:30 -0700653 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
Patrick McHardyffc8fef2007-07-30 17:11:50 -0700654 if (sch == NULL) {
655 WARN_ON(parentid != TC_H_ROOT);
656 return;
657 }
Patrick McHardy43effa12006-11-29 17:35:48 -0800658 cops = sch->ops->cl_ops;
659 if (cops->qlen_notify) {
660 cl = cops->get(sch, parentid);
661 cops->qlen_notify(sch, cl);
662 cops->put(sch, cl);
663 }
664 sch->q.qlen -= n;
665 }
666}
667EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Tom Goff7316ae82010-03-19 15:40:13 +0000669static void notify_and_destroy(struct net *net, struct sk_buff *skb,
670 struct nlmsghdr *n, u32 clid,
David S. Miller99194cf2008-07-17 04:54:10 -0700671 struct Qdisc *old, struct Qdisc *new)
672{
673 if (new || old)
Tom Goff7316ae82010-03-19 15:40:13 +0000674 qdisc_notify(net, skb, n, clid, old, new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
David S. Miller4d8863a2008-08-18 21:03:15 -0700676 if (old)
David S. Miller99194cf2008-07-17 04:54:10 -0700677 qdisc_destroy(old);
David S. Miller99194cf2008-07-17 04:54:10 -0700678}
679
680/* Graft qdisc "new" to class "classid" of qdisc "parent" or
681 * to device "dev".
682 *
683 * When appropriate send a netlink notification using 'skb'
684 * and "n".
685 *
686 * On success, destroy old qdisc.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 */
688
689static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
David S. Miller99194cf2008-07-17 04:54:10 -0700690 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
691 struct Qdisc *new, struct Qdisc *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692{
David S. Miller99194cf2008-07-17 04:54:10 -0700693 struct Qdisc *q = old;
Tom Goff7316ae82010-03-19 15:40:13 +0000694 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900697 if (parent == NULL) {
David S. Miller99194cf2008-07-17 04:54:10 -0700698 unsigned int i, num_q, ingress;
699
700 ingress = 0;
701 num_q = dev->num_tx_queues;
David S. Miller8d50b532008-07-30 02:37:46 -0700702 if ((q && q->flags & TCQ_F_INGRESS) ||
703 (new && new->flags & TCQ_F_INGRESS)) {
David S. Miller99194cf2008-07-17 04:54:10 -0700704 num_q = 1;
705 ingress = 1;
Eric Dumazet24824a02010-10-02 06:11:55 +0000706 if (!dev_ingress_queue(dev))
707 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 }
David S. Miller99194cf2008-07-17 04:54:10 -0700709
710 if (dev->flags & IFF_UP)
711 dev_deactivate(dev);
712
David S. Miller6ec1c692009-09-06 01:58:51 -0700713 if (new && new->ops->attach) {
714 new->ops->attach(new);
715 num_q = 0;
716 }
717
David S. Miller99194cf2008-07-17 04:54:10 -0700718 for (i = 0; i < num_q; i++) {
Eric Dumazet24824a02010-10-02 06:11:55 +0000719 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
David S. Miller99194cf2008-07-17 04:54:10 -0700720
721 if (!ingress)
722 dev_queue = netdev_get_tx_queue(dev, i);
723
David S. Miller8d50b532008-07-30 02:37:46 -0700724 old = dev_graft_qdisc(dev_queue, new);
725 if (new && i > 0)
726 atomic_inc(&new->refcnt);
727
Jarek Poplawski036d6a62009-09-13 22:35:44 +0000728 if (!ingress)
729 qdisc_destroy(old);
David S. Miller99194cf2008-07-17 04:54:10 -0700730 }
731
Jarek Poplawski036d6a62009-09-13 22:35:44 +0000732 if (!ingress) {
Tom Goff7316ae82010-03-19 15:40:13 +0000733 notify_and_destroy(net, skb, n, classid,
734 dev->qdisc, new);
Jarek Poplawski036d6a62009-09-13 22:35:44 +0000735 if (new && !new->ops->attach)
736 atomic_inc(&new->refcnt);
737 dev->qdisc = new ? : &noop_qdisc;
738 } else {
Tom Goff7316ae82010-03-19 15:40:13 +0000739 notify_and_destroy(net, skb, n, classid, old, new);
Jarek Poplawski036d6a62009-09-13 22:35:44 +0000740 }
Patrick McHardyaf356af2009-09-04 06:41:18 +0000741
David S. Miller99194cf2008-07-17 04:54:10 -0700742 if (dev->flags & IFF_UP)
743 dev_activate(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 } else {
Eric Dumazet20fea082007-11-14 01:44:41 -0800745 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Patrick McHardyc9f1d032009-09-04 06:41:13 +0000747 err = -EOPNOTSUPP;
748 if (cops && cops->graft) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 unsigned long cl = cops->get(parent, classid);
750 if (cl) {
David S. Miller99194cf2008-07-17 04:54:10 -0700751 err = cops->graft(parent, cl, new, &old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 cops->put(parent, cl);
Patrick McHardyc9f1d032009-09-04 06:41:13 +0000753 } else
754 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 }
David S. Miller99194cf2008-07-17 04:54:10 -0700756 if (!err)
Tom Goff7316ae82010-03-19 15:40:13 +0000757 notify_and_destroy(net, skb, n, classid, old, new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 }
759 return err;
760}
761
Jarek Poplawski25bfcd52008-08-18 20:53:34 -0700762/* lockdep annotation is needed for ingress; egress gets it only for name */
763static struct lock_class_key qdisc_tx_lock;
764static struct lock_class_key qdisc_rx_lock;
765
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766/*
767 Allocate and initialize new qdisc.
768
769 Parameters are passed via opt.
770 */
771
772static struct Qdisc *
David S. Millerbb949fb2008-07-08 16:55:56 -0700773qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
Patrick McHardy23bcf632009-09-09 18:11:23 -0700774 struct Qdisc *p, u32 parent, u32 handle,
775 struct nlattr **tca, int *errp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776{
777 int err;
Patrick McHardy1e904742008-01-22 22:11:17 -0800778 struct nlattr *kind = tca[TCA_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 struct Qdisc *sch;
780 struct Qdisc_ops *ops;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700781 struct qdisc_size_table *stab;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
783 ops = qdisc_lookup_ops(kind);
Johannes Berg95a5afc2008-10-16 15:24:51 -0700784#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 if (ops == NULL && kind != NULL) {
786 char name[IFNAMSIZ];
Patrick McHardy1e904742008-01-22 22:11:17 -0800787 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 /* We dropped the RTNL semaphore in order to
789 * perform the module load. So, even if we
790 * succeeded in loading the module we have to
791 * tell the caller to replay the request. We
792 * indicate this using -EAGAIN.
793 * We replay the request because the device may
794 * go away in the mean time.
795 */
796 rtnl_unlock();
797 request_module("sch_%s", name);
798 rtnl_lock();
799 ops = qdisc_lookup_ops(kind);
800 if (ops != NULL) {
801 /* We will try again qdisc_lookup_ops,
802 * so don't keep a reference.
803 */
804 module_put(ops->owner);
805 err = -EAGAIN;
806 goto err_out;
807 }
808 }
809 }
810#endif
811
Jamal Hadi Salimb9e2cc02006-08-03 16:36:51 -0700812 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 if (ops == NULL)
814 goto err_out;
815
David S. Miller5ce2d482008-07-08 17:06:30 -0700816 sch = qdisc_alloc(dev_queue, ops);
Thomas Graf3d54b822005-07-05 14:15:09 -0700817 if (IS_ERR(sch)) {
818 err = PTR_ERR(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 goto err_out2;
Thomas Graf3d54b822005-07-05 14:15:09 -0700820 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
Patrick McHardyffc8fef2007-07-30 17:11:50 -0700822 sch->parent = parent;
823
Thomas Graf3d54b822005-07-05 14:15:09 -0700824 if (handle == TC_H_INGRESS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 sch->flags |= TCQ_F_INGRESS;
Thomas Graf3d54b822005-07-05 14:15:09 -0700826 handle = TC_H_MAKE(TC_H_INGRESS, 0);
Jarek Poplawski25bfcd52008-08-18 20:53:34 -0700827 lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
Patrick McHardyfd44de72007-04-16 17:07:08 -0700828 } else {
Patrick McHardyfd44de72007-04-16 17:07:08 -0700829 if (handle == 0) {
830 handle = qdisc_alloc_handle(dev);
831 err = -ENOMEM;
832 if (handle == 0)
833 goto err_out3;
834 }
Jarek Poplawski25bfcd52008-08-18 20:53:34 -0700835 lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 }
837
Thomas Graf3d54b822005-07-05 14:15:09 -0700838 sch->handle = handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
Patrick McHardy1e904742008-01-22 22:11:17 -0800840 if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700841 if (tca[TCA_STAB]) {
842 stab = qdisc_get_stab(tca[TCA_STAB]);
843 if (IS_ERR(stab)) {
844 err = PTR_ERR(stab);
Jarek Poplawski7c64b9f2009-09-15 23:42:05 -0700845 goto err_out4;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700846 }
Eric Dumazeta2da5702011-01-20 03:48:19 +0000847 rcu_assign_pointer(sch->stab, stab);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700848 }
Patrick McHardy1e904742008-01-22 22:11:17 -0800849 if (tca[TCA_RATE]) {
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700850 spinlock_t *root_lock;
851
Patrick McHardy23bcf632009-09-09 18:11:23 -0700852 err = -EOPNOTSUPP;
853 if (sch->flags & TCQ_F_MQROOT)
854 goto err_out4;
855
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700856 if ((sch->parent != TC_H_ROOT) &&
Patrick McHardy23bcf632009-09-09 18:11:23 -0700857 !(sch->flags & TCQ_F_INGRESS) &&
858 (!p || !(p->flags & TCQ_F_MQROOT)))
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700859 root_lock = qdisc_root_sleeping_lock(sch);
860 else
861 root_lock = qdisc_lock(sch);
862
Thomas Graf023e09a2005-07-05 14:15:53 -0700863 err = gen_new_estimator(&sch->bstats, &sch->rate_est,
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700864 root_lock, tca[TCA_RATE]);
Patrick McHardy23bcf632009-09-09 18:11:23 -0700865 if (err)
866 goto err_out4;
Thomas Graf023e09a2005-07-05 14:15:53 -0700867 }
Jarek Poplawskif6e0b232008-08-22 03:24:05 -0700868
869 qdisc_list_add(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 return sch;
872 }
873err_out3:
874 dev_put(dev);
Thomas Graf3d54b822005-07-05 14:15:09 -0700875 kfree((char *) sch - sch->padded);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876err_out2:
877 module_put(ops->owner);
878err_out:
879 *errp = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 return NULL;
Patrick McHardy23bcf632009-09-09 18:11:23 -0700881
882err_out4:
883 /*
884 * Any broken qdiscs that would require a ops->reset() here?
885 * The qdisc was never in action so it shouldn't be necessary.
886 */
Eric Dumazeta2da5702011-01-20 03:48:19 +0000887 qdisc_put_stab(rtnl_dereference(sch->stab));
Patrick McHardy23bcf632009-09-09 18:11:23 -0700888 if (ops->destroy)
889 ops->destroy(sch);
890 goto err_out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891}
892
Patrick McHardy1e904742008-01-22 22:11:17 -0800893static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894{
Eric Dumazeta2da5702011-01-20 03:48:19 +0000895 struct qdisc_size_table *ostab, *stab = NULL;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700896 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700898 if (tca[TCA_OPTIONS]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 if (sch->ops->change == NULL)
900 return -EINVAL;
Patrick McHardy1e904742008-01-22 22:11:17 -0800901 err = sch->ops->change(sch, tca[TCA_OPTIONS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 if (err)
903 return err;
904 }
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700905
906 if (tca[TCA_STAB]) {
907 stab = qdisc_get_stab(tca[TCA_STAB]);
908 if (IS_ERR(stab))
909 return PTR_ERR(stab);
910 }
911
Eric Dumazeta2da5702011-01-20 03:48:19 +0000912 ostab = rtnl_dereference(sch->stab);
913 rcu_assign_pointer(sch->stab, stab);
914 qdisc_put_stab(ostab);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700915
Patrick McHardy23bcf632009-09-09 18:11:23 -0700916 if (tca[TCA_RATE]) {
Stephen Hemminger71bcb092008-11-25 21:13:31 -0800917 /* NB: ignores errors from replace_estimator
918 because change can't be undone. */
Patrick McHardy23bcf632009-09-09 18:11:23 -0700919 if (sch->flags & TCQ_F_MQROOT)
920 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 gen_replace_estimator(&sch->bstats, &sch->rate_est,
Stephen Hemminger71bcb092008-11-25 21:13:31 -0800922 qdisc_root_sleeping_lock(sch),
923 tca[TCA_RATE]);
Patrick McHardy23bcf632009-09-09 18:11:23 -0700924 }
925out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 return 0;
927}
928
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000929struct check_loop_arg {
930 struct qdisc_walker w;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 struct Qdisc *p;
932 int depth;
933};
934
935static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w);
936
937static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
938{
939 struct check_loop_arg arg;
940
941 if (q->ops->cl_ops == NULL)
942 return 0;
943
944 arg.w.stop = arg.w.skip = arg.w.count = 0;
945 arg.w.fn = check_loop_fn;
946 arg.depth = depth;
947 arg.p = p;
948 q->ops->cl_ops->walk(q, &arg.w);
949 return arg.w.stop ? -ELOOP : 0;
950}
951
952static int
953check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
954{
955 struct Qdisc *leaf;
Eric Dumazet20fea082007-11-14 01:44:41 -0800956 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 struct check_loop_arg *arg = (struct check_loop_arg *)w;
958
959 leaf = cops->leaf(q, cl);
960 if (leaf) {
961 if (leaf == arg->p || arg->depth > 7)
962 return -ELOOP;
963 return check_loop(leaf, arg->p, arg->depth + 1);
964 }
965 return 0;
966}
967
968/*
969 * Delete/get qdisc.
970 */
971
972static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
973{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900974 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 struct tcmsg *tcm = NLMSG_DATA(n);
Patrick McHardy1e904742008-01-22 22:11:17 -0800976 struct nlattr *tca[TCA_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 struct net_device *dev;
978 u32 clid = tcm->tcm_parent;
979 struct Qdisc *q = NULL;
980 struct Qdisc *p = NULL;
981 int err;
982
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000983 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
984 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 return -ENODEV;
986
Patrick McHardy1e904742008-01-22 22:11:17 -0800987 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
988 if (err < 0)
989 return err;
990
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 if (clid) {
992 if (clid != TC_H_ROOT) {
993 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000994 p = qdisc_lookup(dev, TC_H_MAJ(clid));
995 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 return -ENOENT;
997 q = qdisc_leaf(p, clid);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000998 } else if (dev_ingress_queue(dev)) {
999 q = dev_ingress_queue(dev)->qdisc_sleeping;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001000 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 } else {
Patrick McHardyaf356af2009-09-04 06:41:18 +00001002 q = dev->qdisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 }
1004 if (!q)
1005 return -ENOENT;
1006
1007 if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
1008 return -EINVAL;
1009 } else {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001010 q = qdisc_lookup(dev, tcm->tcm_handle);
1011 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 return -ENOENT;
1013 }
1014
Patrick McHardy1e904742008-01-22 22:11:17 -08001015 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 return -EINVAL;
1017
1018 if (n->nlmsg_type == RTM_DELQDISC) {
1019 if (!clid)
1020 return -EINVAL;
1021 if (q->handle == 0)
1022 return -ENOENT;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001023 err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
1024 if (err != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 } else {
Tom Goff7316ae82010-03-19 15:40:13 +00001027 qdisc_notify(net, skb, n, clid, NULL, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 }
1029 return 0;
1030}
1031
1032/*
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001033 * Create/change qdisc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 */
1035
1036static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
1037{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001038 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 struct tcmsg *tcm;
Patrick McHardy1e904742008-01-22 22:11:17 -08001040 struct nlattr *tca[TCA_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 struct net_device *dev;
1042 u32 clid;
1043 struct Qdisc *q, *p;
1044 int err;
1045
1046replay:
1047 /* Reinit, just in case something touches this. */
1048 tcm = NLMSG_DATA(n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 clid = tcm->tcm_parent;
1050 q = p = NULL;
1051
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001052 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1053 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 return -ENODEV;
1055
Patrick McHardy1e904742008-01-22 22:11:17 -08001056 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1057 if (err < 0)
1058 return err;
1059
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 if (clid) {
1061 if (clid != TC_H_ROOT) {
1062 if (clid != TC_H_INGRESS) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001063 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1064 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 return -ENOENT;
1066 q = qdisc_leaf(p, clid);
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001067 } else if (dev_ingress_queue_create(dev)) {
1068 q = dev_ingress_queue(dev)->qdisc_sleeping;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 }
1070 } else {
Patrick McHardyaf356af2009-09-04 06:41:18 +00001071 q = dev->qdisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 }
1073
1074 /* It may be default qdisc, ignore it */
1075 if (q && q->handle == 0)
1076 q = NULL;
1077
1078 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1079 if (tcm->tcm_handle) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001080 if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 return -EEXIST;
1082 if (TC_H_MIN(tcm->tcm_handle))
1083 return -EINVAL;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001084 q = qdisc_lookup(dev, tcm->tcm_handle);
1085 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 goto create_n_graft;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001087 if (n->nlmsg_flags & NLM_F_EXCL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 return -EEXIST;
Patrick McHardy1e904742008-01-22 22:11:17 -08001089 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 return -EINVAL;
1091 if (q == p ||
1092 (p && check_loop(q, p, 0)))
1093 return -ELOOP;
1094 atomic_inc(&q->refcnt);
1095 goto graft;
1096 } else {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001097 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 goto create_n_graft;
1099
1100 /* This magic test requires explanation.
1101 *
1102 * We know, that some child q is already
1103 * attached to this parent and have choice:
1104 * either to change it or to create/graft new one.
1105 *
1106 * 1. We are allowed to create/graft only
1107 * if CREATE and REPLACE flags are set.
1108 *
1109 * 2. If EXCL is set, requestor wanted to say,
1110 * that qdisc tcm_handle is not expected
1111 * to exist, so that we choose create/graft too.
1112 *
1113 * 3. The last case is when no flags are set.
1114 * Alas, it is sort of hole in API, we
1115 * cannot decide what to do unambiguously.
1116 * For now we select create/graft, if
1117 * user gave KIND, which does not match existing.
1118 */
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001119 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1120 (n->nlmsg_flags & NLM_F_REPLACE) &&
1121 ((n->nlmsg_flags & NLM_F_EXCL) ||
Patrick McHardy1e904742008-01-22 22:11:17 -08001122 (tca[TCA_KIND] &&
1123 nla_strcmp(tca[TCA_KIND], q->ops->id))))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 goto create_n_graft;
1125 }
1126 }
1127 } else {
1128 if (!tcm->tcm_handle)
1129 return -EINVAL;
1130 q = qdisc_lookup(dev, tcm->tcm_handle);
1131 }
1132
1133 /* Change qdisc parameters */
1134 if (q == NULL)
1135 return -ENOENT;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001136 if (n->nlmsg_flags & NLM_F_EXCL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 return -EEXIST;
Patrick McHardy1e904742008-01-22 22:11:17 -08001138 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 return -EINVAL;
1140 err = qdisc_change(q, tca);
1141 if (err == 0)
Tom Goff7316ae82010-03-19 15:40:13 +00001142 qdisc_notify(net, skb, n, clid, NULL, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 return err;
1144
1145create_n_graft:
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001146 if (!(n->nlmsg_flags & NLM_F_CREATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 return -ENOENT;
Eric Dumazet24824a02010-10-02 06:11:55 +00001148 if (clid == TC_H_INGRESS) {
1149 if (dev_ingress_queue(dev))
1150 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1151 tcm->tcm_parent, tcm->tcm_parent,
1152 tca, &err);
1153 else
1154 err = -ENOENT;
1155 } else {
Jarek Poplawski926e61b2009-09-15 02:53:07 -07001156 struct netdev_queue *dev_queue;
David S. Miller6ec1c692009-09-06 01:58:51 -07001157
1158 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
Jarek Poplawski926e61b2009-09-15 02:53:07 -07001159 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1160 else if (p)
1161 dev_queue = p->dev_queue;
1162 else
1163 dev_queue = netdev_get_tx_queue(dev, 0);
David S. Miller6ec1c692009-09-06 01:58:51 -07001164
Jarek Poplawski926e61b2009-09-15 02:53:07 -07001165 q = qdisc_create(dev, dev_queue, p,
David S. Millerbb949fb2008-07-08 16:55:56 -07001166 tcm->tcm_parent, tcm->tcm_handle,
Patrick McHardyffc8fef2007-07-30 17:11:50 -07001167 tca, &err);
David S. Miller6ec1c692009-09-06 01:58:51 -07001168 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 if (q == NULL) {
1170 if (err == -EAGAIN)
1171 goto replay;
1172 return err;
1173 }
1174
1175graft:
Ilpo Järvinene5befbd2008-08-18 22:30:01 -07001176 err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
1177 if (err) {
1178 if (q)
1179 qdisc_destroy(q);
1180 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 }
Ilpo Järvinene5befbd2008-08-18 22:30:01 -07001182
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 return 0;
1184}
1185
1186static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -07001187 u32 pid, u32 seq, u16 flags, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188{
1189 struct tcmsg *tcm;
1190 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001191 unsigned char *b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 struct gnet_dump d;
Eric Dumazeta2da5702011-01-20 03:48:19 +00001193 struct qdisc_size_table *stab;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -07001195 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 tcm = NLMSG_DATA(nlh);
1197 tcm->tcm_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -07001198 tcm->tcm__pad1 = 0;
1199 tcm->tcm__pad2 = 0;
David S. Miller5ce2d482008-07-08 17:06:30 -07001200 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 tcm->tcm_parent = clid;
1202 tcm->tcm_handle = q->handle;
1203 tcm->tcm_info = atomic_read(&q->refcnt);
Patrick McHardy57e1c482008-01-23 20:34:28 -08001204 NLA_PUT_STRING(skb, TCA_KIND, q->ops->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 if (q->ops->dump && q->ops->dump(q, skb) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001206 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 q->qstats.qlen = q->q.qlen;
1208
Eric Dumazeta2da5702011-01-20 03:48:19 +00001209 stab = rtnl_dereference(q->stab);
1210 if (stab && qdisc_dump_stab(skb, stab) < 0)
Jussi Kivilinna175f9c12008-07-20 00:08:47 -07001211 goto nla_put_failure;
1212
Jarek Poplawski102396a2008-08-29 14:21:52 -07001213 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1214 qdisc_root_sleeping_lock(q), &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001215 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216
1217 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001218 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219
1220 if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
Eric Dumazetd250a5f2009-10-02 10:32:18 +00001221 gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 gnet_stats_copy_queue(&d, &q->qstats) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001223 goto nla_put_failure;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001224
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 if (gnet_stats_finish_copy(&d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001226 goto nla_put_failure;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001227
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001228 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 return skb->len;
1230
1231nlmsg_failure:
Patrick McHardy1e904742008-01-22 22:11:17 -08001232nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001233 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 return -1;
1235}
1236
Eric Dumazet53b0f082010-05-22 20:37:44 +00001237static bool tc_qdisc_dump_ignore(struct Qdisc *q)
1238{
1239 return (q->flags & TCQ_F_BUILTIN) ? true : false;
1240}
1241
Tom Goff7316ae82010-03-19 15:40:13 +00001242static int qdisc_notify(struct net *net, struct sk_buff *oskb,
1243 struct nlmsghdr *n, u32 clid,
1244 struct Qdisc *old, struct Qdisc *new)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245{
1246 struct sk_buff *skb;
1247 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
1248
1249 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1250 if (!skb)
1251 return -ENOBUFS;
1252
Eric Dumazet53b0f082010-05-22 20:37:44 +00001253 if (old && !tc_qdisc_dump_ignore(old)) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001254 if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq,
1255 0, RTM_DELQDISC) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 goto err_out;
1257 }
Eric Dumazet53b0f082010-05-22 20:37:44 +00001258 if (new && !tc_qdisc_dump_ignore(new)) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001259 if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq,
1260 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 goto err_out;
1262 }
1263
1264 if (skb->len)
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001265 return rtnetlink_send(skb, net, pid, RTNLGRP_TC,
1266 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267
1268err_out:
1269 kfree_skb(skb);
1270 return -EINVAL;
1271}
1272
David S. Miller30723672008-07-18 22:50:15 -07001273static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1274 struct netlink_callback *cb,
1275 int *q_idx_p, int s_q_idx)
1276{
1277 int ret = 0, q_idx = *q_idx_p;
1278 struct Qdisc *q;
1279
1280 if (!root)
1281 return 0;
1282
1283 q = root;
1284 if (q_idx < s_q_idx) {
1285 q_idx++;
1286 } else {
1287 if (!tc_qdisc_dump_ignore(q) &&
1288 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid,
1289 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1290 goto done;
1291 q_idx++;
1292 }
1293 list_for_each_entry(q, &root->list, list) {
1294 if (q_idx < s_q_idx) {
1295 q_idx++;
1296 continue;
1297 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001298 if (!tc_qdisc_dump_ignore(q) &&
David S. Miller30723672008-07-18 22:50:15 -07001299 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid,
1300 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1301 goto done;
1302 q_idx++;
1303 }
1304
1305out:
1306 *q_idx_p = q_idx;
1307 return ret;
1308done:
1309 ret = -1;
1310 goto out;
1311}
1312
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1314{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001315 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 int idx, q_idx;
1317 int s_idx, s_q_idx;
1318 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319
1320 s_idx = cb->args[0];
1321 s_q_idx = q_idx = cb->args[1];
stephen hemmingerf1e90162009-11-10 07:54:49 +00001322
1323 rcu_read_lock();
Pavel Emelianov7562f872007-05-03 15:13:45 -07001324 idx = 0;
Tom Goff7316ae82010-03-19 15:40:13 +00001325 for_each_netdev_rcu(net, dev) {
David S. Miller30723672008-07-18 22:50:15 -07001326 struct netdev_queue *dev_queue;
1327
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 if (idx < s_idx)
Pavel Emelianov7562f872007-05-03 15:13:45 -07001329 goto cont;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 if (idx > s_idx)
1331 s_q_idx = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 q_idx = 0;
David S. Miller30723672008-07-18 22:50:15 -07001333
Patrick McHardyaf356af2009-09-04 06:41:18 +00001334 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001335 goto done;
1336
Eric Dumazet24824a02010-10-02 06:11:55 +00001337 dev_queue = dev_ingress_queue(dev);
1338 if (dev_queue &&
1339 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1340 &q_idx, s_q_idx) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001341 goto done;
1342
Pavel Emelianov7562f872007-05-03 15:13:45 -07001343cont:
1344 idx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 }
1346
1347done:
stephen hemmingerf1e90162009-11-10 07:54:49 +00001348 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349
1350 cb->args[0] = idx;
1351 cb->args[1] = q_idx;
1352
1353 return skb->len;
1354}
1355
1356
1357
1358/************************************************
1359 * Traffic classes manipulation. *
1360 ************************************************/
1361
1362
1363
1364static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
1365{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001366 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 struct tcmsg *tcm = NLMSG_DATA(n);
Patrick McHardy1e904742008-01-22 22:11:17 -08001368 struct nlattr *tca[TCA_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 struct net_device *dev;
1370 struct Qdisc *q = NULL;
Eric Dumazet20fea082007-11-14 01:44:41 -08001371 const struct Qdisc_class_ops *cops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 unsigned long cl = 0;
1373 unsigned long new_cl;
1374 u32 pid = tcm->tcm_parent;
1375 u32 clid = tcm->tcm_handle;
1376 u32 qid = TC_H_MAJ(clid);
1377 int err;
1378
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001379 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1380 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 return -ENODEV;
1382
Patrick McHardy1e904742008-01-22 22:11:17 -08001383 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1384 if (err < 0)
1385 return err;
1386
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 /*
1388 parent == TC_H_UNSPEC - unspecified parent.
1389 parent == TC_H_ROOT - class is root, which has no parent.
1390 parent == X:0 - parent is root class.
1391 parent == X:Y - parent is a node in hierarchy.
1392 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1393
1394 handle == 0:0 - generate handle from kernel pool.
1395 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1396 handle == X:Y - clear.
1397 handle == X:0 - root class.
1398 */
1399
1400 /* Step 1. Determine qdisc handle X:0 */
1401
1402 if (pid != TC_H_ROOT) {
1403 u32 qid1 = TC_H_MAJ(pid);
1404
1405 if (qid && qid1) {
1406 /* If both majors are known, they must be identical. */
1407 if (qid != qid1)
1408 return -EINVAL;
1409 } else if (qid1) {
1410 qid = qid1;
1411 } else if (qid == 0)
Patrick McHardyaf356af2009-09-04 06:41:18 +00001412 qid = dev->qdisc->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
1414 /* Now qid is genuine qdisc handle consistent
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001415 * both with parent and child.
1416 *
1417 * TC_H_MAJ(pid) still may be unspecified, complete it now.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 */
1419 if (pid)
1420 pid = TC_H_MAKE(qid, pid);
1421 } else {
1422 if (qid == 0)
Patrick McHardyaf356af2009-09-04 06:41:18 +00001423 qid = dev->qdisc->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 }
1425
1426 /* OK. Locate qdisc */
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001427 q = qdisc_lookup(dev, qid);
1428 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 return -ENOENT;
1430
1431 /* An check that it supports classes */
1432 cops = q->ops->cl_ops;
1433 if (cops == NULL)
1434 return -EINVAL;
1435
1436 /* Now try to get class */
1437 if (clid == 0) {
1438 if (pid == TC_H_ROOT)
1439 clid = qid;
1440 } else
1441 clid = TC_H_MAKE(qid, clid);
1442
1443 if (clid)
1444 cl = cops->get(q, clid);
1445
1446 if (cl == 0) {
1447 err = -ENOENT;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001448 if (n->nlmsg_type != RTM_NEWTCLASS ||
1449 !(n->nlmsg_flags & NLM_F_CREATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 goto out;
1451 } else {
1452 switch (n->nlmsg_type) {
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001453 case RTM_NEWTCLASS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 err = -EEXIST;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001455 if (n->nlmsg_flags & NLM_F_EXCL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456 goto out;
1457 break;
1458 case RTM_DELTCLASS:
Patrick McHardyde6d5cd2009-09-04 06:41:16 +00001459 err = -EOPNOTSUPP;
1460 if (cops->delete)
1461 err = cops->delete(q, cl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 if (err == 0)
Tom Goff7316ae82010-03-19 15:40:13 +00001463 tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 goto out;
1465 case RTM_GETTCLASS:
Tom Goff7316ae82010-03-19 15:40:13 +00001466 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 goto out;
1468 default:
1469 err = -EINVAL;
1470 goto out;
1471 }
1472 }
1473
1474 new_cl = cl;
Patrick McHardyde6d5cd2009-09-04 06:41:16 +00001475 err = -EOPNOTSUPP;
1476 if (cops->change)
1477 err = cops->change(q, clid, pid, tca, &new_cl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 if (err == 0)
Tom Goff7316ae82010-03-19 15:40:13 +00001479 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
1481out:
1482 if (cl)
1483 cops->put(q, cl);
1484
1485 return err;
1486}
1487
1488
1489static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1490 unsigned long cl,
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -07001491 u32 pid, u32 seq, u16 flags, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492{
1493 struct tcmsg *tcm;
1494 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001495 unsigned char *b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 struct gnet_dump d;
Eric Dumazet20fea082007-11-14 01:44:41 -08001497 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -07001499 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 tcm = NLMSG_DATA(nlh);
1501 tcm->tcm_family = AF_UNSPEC;
Eric Dumazet16ebb5e2009-09-02 02:40:09 +00001502 tcm->tcm__pad1 = 0;
1503 tcm->tcm__pad2 = 0;
David S. Miller5ce2d482008-07-08 17:06:30 -07001504 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 tcm->tcm_parent = q->handle;
1506 tcm->tcm_handle = q->handle;
1507 tcm->tcm_info = 0;
Patrick McHardy57e1c482008-01-23 20:34:28 -08001508 NLA_PUT_STRING(skb, TCA_KIND, q->ops->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001510 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
Jarek Poplawski102396a2008-08-29 14:21:52 -07001512 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1513 qdisc_root_sleeping_lock(q), &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001514 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515
1516 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001517 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518
1519 if (gnet_stats_finish_copy(&d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001520 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001522 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 return skb->len;
1524
1525nlmsg_failure:
Patrick McHardy1e904742008-01-22 22:11:17 -08001526nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001527 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 return -1;
1529}
1530
Tom Goff7316ae82010-03-19 15:40:13 +00001531static int tclass_notify(struct net *net, struct sk_buff *oskb,
1532 struct nlmsghdr *n, struct Qdisc *q,
1533 unsigned long cl, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534{
1535 struct sk_buff *skb;
1536 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
1537
1538 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1539 if (!skb)
1540 return -ENOBUFS;
1541
1542 if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) {
1543 kfree_skb(skb);
1544 return -EINVAL;
1545 }
1546
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001547 return rtnetlink_send(skb, net, pid, RTNLGRP_TC,
1548 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549}
1550
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001551struct qdisc_dump_args {
1552 struct qdisc_walker w;
1553 struct sk_buff *skb;
1554 struct netlink_callback *cb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555};
1556
1557static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg)
1558{
1559 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
1560
1561 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid,
1562 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS);
1563}
1564
David S. Miller30723672008-07-18 22:50:15 -07001565static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
1566 struct tcmsg *tcm, struct netlink_callback *cb,
1567 int *t_p, int s_t)
1568{
1569 struct qdisc_dump_args arg;
1570
1571 if (tc_qdisc_dump_ignore(q) ||
1572 *t_p < s_t || !q->ops->cl_ops ||
1573 (tcm->tcm_parent &&
1574 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
1575 (*t_p)++;
1576 return 0;
1577 }
1578 if (*t_p > s_t)
1579 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
1580 arg.w.fn = qdisc_class_dump;
1581 arg.skb = skb;
1582 arg.cb = cb;
1583 arg.w.stop = 0;
1584 arg.w.skip = cb->args[1];
1585 arg.w.count = 0;
1586 q->ops->cl_ops->walk(q, &arg.w);
1587 cb->args[1] = arg.w.count;
1588 if (arg.w.stop)
1589 return -1;
1590 (*t_p)++;
1591 return 0;
1592}
1593
1594static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
1595 struct tcmsg *tcm, struct netlink_callback *cb,
1596 int *t_p, int s_t)
1597{
1598 struct Qdisc *q;
1599
1600 if (!root)
1601 return 0;
1602
1603 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
1604 return -1;
1605
1606 list_for_each_entry(q, &root->list, list) {
1607 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
1608 return -1;
1609 }
1610
1611 return 0;
1612}
1613
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
1615{
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001616 struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh);
David S. Miller30723672008-07-18 22:50:15 -07001617 struct net *net = sock_net(skb->sk);
1618 struct netdev_queue *dev_queue;
1619 struct net_device *dev;
1620 int t, s_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621
1622 if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
1623 return 0;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001624 dev = dev_get_by_index(net, tcm->tcm_ifindex);
1625 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 return 0;
1627
1628 s_t = cb->args[0];
1629 t = 0;
1630
Patrick McHardyaf356af2009-09-04 06:41:18 +00001631 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001632 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633
Eric Dumazet24824a02010-10-02 06:11:55 +00001634 dev_queue = dev_ingress_queue(dev);
1635 if (dev_queue &&
1636 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
1637 &t, s_t) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001638 goto done;
1639
1640done:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 cb->args[0] = t;
1642
1643 dev_put(dev);
1644 return skb->len;
1645}
1646
1647/* Main classifier routine: scans classifier chain attached
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001648 * to this qdisc, (optionally) tests for protocol and asks
1649 * specific classifiers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 */
Eric Dumazetdc7f9f62011-07-05 23:25:42 +00001651int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
Patrick McHardy73ca4912007-07-15 00:02:31 -07001652 struct tcf_result *res)
1653{
1654 __be16 protocol = skb->protocol;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001655 int err;
Patrick McHardy73ca4912007-07-15 00:02:31 -07001656
1657 for (; tp; tp = tp->next) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001658 if (tp->protocol != protocol &&
1659 tp->protocol != htons(ETH_P_ALL))
1660 continue;
1661 err = tp->classify(skb, tp, res);
1662
1663 if (err >= 0) {
Patrick McHardy73ca4912007-07-15 00:02:31 -07001664#ifdef CONFIG_NET_CLS_ACT
1665 if (err != TC_ACT_RECLASSIFY && skb->tc_verd)
1666 skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0);
1667#endif
1668 return err;
1669 }
1670 }
1671 return -1;
1672}
1673EXPORT_SYMBOL(tc_classify_compat);
1674
Eric Dumazetdc7f9f62011-07-05 23:25:42 +00001675int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
Patrick McHardy73ca4912007-07-15 00:02:31 -07001676 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677{
1678 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679#ifdef CONFIG_NET_CLS_ACT
Eric Dumazetdc7f9f62011-07-05 23:25:42 +00001680 const struct tcf_proto *otp = tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681reclassify:
Hagen Paul Pfeifer52bc9742011-02-25 05:45:21 +00001682#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683
Patrick McHardy73ca4912007-07-15 00:02:31 -07001684 err = tc_classify_compat(skb, tp, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685#ifdef CONFIG_NET_CLS_ACT
Patrick McHardy73ca4912007-07-15 00:02:31 -07001686 if (err == TC_ACT_RECLASSIFY) {
1687 u32 verd = G_TC_VERD(skb->tc_verd);
1688 tp = otp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689
Patrick McHardy73ca4912007-07-15 00:02:31 -07001690 if (verd++ >= MAX_REC_LOOP) {
stephen hemmingerb60b6592010-05-11 14:24:12 +00001691 if (net_ratelimit())
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001692 pr_notice("%s: packet reclassify loop"
stephen hemmingerb60b6592010-05-11 14:24:12 +00001693 " rule prio %u protocol %02x\n",
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001694 tp->q->ops->id,
1695 tp->prio & 0xffff,
1696 ntohs(tp->protocol));
Patrick McHardy73ca4912007-07-15 00:02:31 -07001697 return TC_ACT_SHOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 }
Patrick McHardy73ca4912007-07-15 00:02:31 -07001699 skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd);
1700 goto reclassify;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 }
Patrick McHardy73ca4912007-07-15 00:02:31 -07001702#endif
1703 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704}
Patrick McHardy73ca4912007-07-15 00:02:31 -07001705EXPORT_SYMBOL(tc_classify);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706
Patrick McHardya48b5a62007-03-23 11:29:43 -07001707void tcf_destroy(struct tcf_proto *tp)
1708{
1709 tp->ops->destroy(tp);
1710 module_put(tp->ops->owner);
1711 kfree(tp);
1712}
1713
Patrick McHardyff31ab52008-07-01 19:52:38 -07001714void tcf_destroy_chain(struct tcf_proto **fl)
Patrick McHardya48b5a62007-03-23 11:29:43 -07001715{
1716 struct tcf_proto *tp;
1717
Patrick McHardyff31ab52008-07-01 19:52:38 -07001718 while ((tp = *fl) != NULL) {
1719 *fl = tp->next;
Patrick McHardya48b5a62007-03-23 11:29:43 -07001720 tcf_destroy(tp);
1721 }
1722}
1723EXPORT_SYMBOL(tcf_destroy_chain);
1724
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725#ifdef CONFIG_PROC_FS
1726static int psched_show(struct seq_file *seq, void *v)
1727{
Patrick McHardy3c0cfc12007-10-10 16:32:41 -07001728 struct timespec ts;
1729
1730 hrtimer_get_res(CLOCK_MONOTONIC, &ts);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 seq_printf(seq, "%08x %08x %08x %08x\n",
Jarek Poplawskica44d6e2009-06-15 02:31:47 -07001732 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
Patrick McHardy514bca32007-03-16 12:34:52 -07001733 1000000,
Patrick McHardy3c0cfc12007-10-10 16:32:41 -07001734 (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735
1736 return 0;
1737}
1738
1739static int psched_open(struct inode *inode, struct file *file)
1740{
Tom Goff7e5ab152010-03-30 19:44:56 -07001741 return single_open(file, psched_show, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742}
1743
Arjan van de Venda7071d2007-02-12 00:55:36 -08001744static const struct file_operations psched_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 .owner = THIS_MODULE,
1746 .open = psched_open,
1747 .read = seq_read,
1748 .llseek = seq_lseek,
1749 .release = single_release,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001750};
Tom Goff7316ae82010-03-19 15:40:13 +00001751
1752static int __net_init psched_net_init(struct net *net)
1753{
1754 struct proc_dir_entry *e;
1755
1756 e = proc_net_fops_create(net, "psched", 0, &psched_fops);
1757 if (e == NULL)
1758 return -ENOMEM;
1759
1760 return 0;
1761}
1762
1763static void __net_exit psched_net_exit(struct net *net)
1764{
1765 proc_net_remove(net, "psched");
Tom Goff7316ae82010-03-19 15:40:13 +00001766}
1767#else
1768static int __net_init psched_net_init(struct net *net)
1769{
1770 return 0;
1771}
1772
1773static void __net_exit psched_net_exit(struct net *net)
1774{
1775}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776#endif
1777
Tom Goff7316ae82010-03-19 15:40:13 +00001778static struct pernet_operations psched_net_ops = {
1779 .init = psched_net_init,
1780 .exit = psched_net_exit,
1781};
1782
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783static int __init pktsched_init(void)
1784{
Tom Goff7316ae82010-03-19 15:40:13 +00001785 int err;
1786
1787 err = register_pernet_subsys(&psched_net_ops);
1788 if (err) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001789 pr_err("pktsched_init: "
Tom Goff7316ae82010-03-19 15:40:13 +00001790 "cannot initialize per netns operations\n");
1791 return err;
1792 }
1793
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 register_qdisc(&pfifo_qdisc_ops);
1795 register_qdisc(&bfifo_qdisc_ops);
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +00001796 register_qdisc(&pfifo_head_drop_qdisc_ops);
David S. Miller6ec1c692009-09-06 01:58:51 -07001797 register_qdisc(&mq_qdisc_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798
Greg Rosec7ac8672011-06-10 01:27:09 +00001799 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
1800 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
1801 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL);
1802 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
1803 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
1804 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL);
Thomas Grafbe577dd2007-03-22 11:55:50 -07001805
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806 return 0;
1807}
1808
1809subsys_initcall(pktsched_init);