blob: a08b4ab3e421da67538f019cd6d7ec19f49fb12d [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;
David S. Miller1b34ec42012-03-29 05:11:39 -0400429 if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
430 goto nla_put_failure;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700431 nla_nest_end(skb, nest);
432
433 return skb->len;
434
435nla_put_failure:
436 return -1;
437}
438
Eric Dumazeta2da5702011-01-20 03:48:19 +0000439void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab)
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700440{
441 int pkt_len, slot;
442
443 pkt_len = skb->len + stab->szopts.overhead;
444 if (unlikely(!stab->szopts.tsize))
445 goto out;
446
447 slot = pkt_len + stab->szopts.cell_align;
448 if (unlikely(slot < 0))
449 slot = 0;
450
451 slot >>= stab->szopts.cell_log;
452 if (likely(slot < stab->szopts.tsize))
453 pkt_len = stab->data[slot];
454 else
455 pkt_len = stab->data[stab->szopts.tsize - 1] *
456 (slot / stab->szopts.tsize) +
457 stab->data[slot % stab->szopts.tsize];
458
459 pkt_len <<= stab->szopts.size_log;
460out:
461 if (unlikely(pkt_len < 1))
462 pkt_len = 1;
463 qdisc_skb_cb(skb)->pkt_len = pkt_len;
464}
Eric Dumazeta2da5702011-01-20 03:48:19 +0000465EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700466
Jarek Poplawskib00355d2009-02-01 01:12:42 -0800467void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc)
468{
469 if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000470 pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
471 txt, qdisc->ops->id, qdisc->handle >> 16);
Jarek Poplawskib00355d2009-02-01 01:12:42 -0800472 qdisc->flags |= TCQ_F_WARN_NONWC;
473 }
474}
475EXPORT_SYMBOL(qdisc_warn_nonwc);
476
Patrick McHardy41794772007-03-16 01:19:15 -0700477static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
478{
479 struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
David S. Miller2fbd3da2009-09-01 17:59:25 -0700480 timer);
Patrick McHardy41794772007-03-16 01:19:15 -0700481
Eric Dumazetfd245a42011-01-20 05:27:16 +0000482 qdisc_unthrottled(wd->qdisc);
David S. Miller8608db02008-08-18 20:51:18 -0700483 __netif_schedule(qdisc_root(wd->qdisc));
Stephen Hemminger19365022007-03-22 12:18:35 -0700484
Patrick McHardy41794772007-03-16 01:19:15 -0700485 return HRTIMER_NORESTART;
486}
487
488void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
489{
David S. Miller2fbd3da2009-09-01 17:59:25 -0700490 hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
491 wd->timer.function = qdisc_watchdog;
Patrick McHardy41794772007-03-16 01:19:15 -0700492 wd->qdisc = qdisc;
493}
494EXPORT_SYMBOL(qdisc_watchdog_init);
495
496void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires)
497{
498 ktime_t time;
499
Jarek Poplawski2540e052008-08-21 05:11:14 -0700500 if (test_bit(__QDISC_STATE_DEACTIVATED,
501 &qdisc_root_sleeping(wd->qdisc)->state))
502 return;
503
Eric Dumazetfd245a42011-01-20 05:27:16 +0000504 qdisc_throttled(wd->qdisc);
Patrick McHardy41794772007-03-16 01:19:15 -0700505 time = ktime_set(0, 0);
Jarek Poplawskica44d6e2009-06-15 02:31:47 -0700506 time = ktime_add_ns(time, PSCHED_TICKS2NS(expires));
David S. Miller2fbd3da2009-09-01 17:59:25 -0700507 hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS);
Patrick McHardy41794772007-03-16 01:19:15 -0700508}
509EXPORT_SYMBOL(qdisc_watchdog_schedule);
510
511void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
512{
David S. Miller2fbd3da2009-09-01 17:59:25 -0700513 hrtimer_cancel(&wd->timer);
Eric Dumazetfd245a42011-01-20 05:27:16 +0000514 qdisc_unthrottled(wd->qdisc);
Patrick McHardy41794772007-03-16 01:19:15 -0700515}
516EXPORT_SYMBOL(qdisc_watchdog_cancel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Adrian Bunka94f7792008-07-22 14:20:11 -0700518static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700519{
520 unsigned int size = n * sizeof(struct hlist_head), i;
521 struct hlist_head *h;
522
523 if (size <= PAGE_SIZE)
524 h = kmalloc(size, GFP_KERNEL);
525 else
526 h = (struct hlist_head *)
527 __get_free_pages(GFP_KERNEL, get_order(size));
528
529 if (h != NULL) {
530 for (i = 0; i < n; i++)
531 INIT_HLIST_HEAD(&h[i]);
532 }
533 return h;
534}
535
536static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n)
537{
538 unsigned int size = n * sizeof(struct hlist_head);
539
540 if (size <= PAGE_SIZE)
541 kfree(h);
542 else
543 free_pages((unsigned long)h, get_order(size));
544}
545
546void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
547{
548 struct Qdisc_class_common *cl;
549 struct hlist_node *n, *next;
550 struct hlist_head *nhash, *ohash;
551 unsigned int nsize, nmask, osize;
552 unsigned int i, h;
553
554 /* Rehash when load factor exceeds 0.75 */
555 if (clhash->hashelems * 4 <= clhash->hashsize * 3)
556 return;
557 nsize = clhash->hashsize * 2;
558 nmask = nsize - 1;
559 nhash = qdisc_class_hash_alloc(nsize);
560 if (nhash == NULL)
561 return;
562
563 ohash = clhash->hash;
564 osize = clhash->hashsize;
565
566 sch_tree_lock(sch);
567 for (i = 0; i < osize; i++) {
568 hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) {
569 h = qdisc_class_hash(cl->classid, nmask);
570 hlist_add_head(&cl->hnode, &nhash[h]);
571 }
572 }
573 clhash->hash = nhash;
574 clhash->hashsize = nsize;
575 clhash->hashmask = nmask;
576 sch_tree_unlock(sch);
577
578 qdisc_class_hash_free(ohash, osize);
579}
580EXPORT_SYMBOL(qdisc_class_hash_grow);
581
582int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
583{
584 unsigned int size = 4;
585
586 clhash->hash = qdisc_class_hash_alloc(size);
587 if (clhash->hash == NULL)
588 return -ENOMEM;
589 clhash->hashsize = size;
590 clhash->hashmask = size - 1;
591 clhash->hashelems = 0;
592 return 0;
593}
594EXPORT_SYMBOL(qdisc_class_hash_init);
595
596void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
597{
598 qdisc_class_hash_free(clhash->hash, clhash->hashsize);
599}
600EXPORT_SYMBOL(qdisc_class_hash_destroy);
601
602void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
603 struct Qdisc_class_common *cl)
604{
605 unsigned int h;
606
607 INIT_HLIST_NODE(&cl->hnode);
608 h = qdisc_class_hash(cl->classid, clhash->hashmask);
609 hlist_add_head(&cl->hnode, &clhash->hash[h]);
610 clhash->hashelems++;
611}
612EXPORT_SYMBOL(qdisc_class_hash_insert);
613
614void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
615 struct Qdisc_class_common *cl)
616{
617 hlist_del(&cl->hnode);
618 clhash->hashelems--;
619}
620EXPORT_SYMBOL(qdisc_class_hash_remove);
621
Eric Dumazetfa0f5aa2012-01-03 00:00:11 +0000622/* Allocate an unique handle from space managed by kernel
623 * Possible range is [8000-FFFF]:0000 (0x8000 values)
624 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625static u32 qdisc_alloc_handle(struct net_device *dev)
626{
Eric Dumazetfa0f5aa2012-01-03 00:00:11 +0000627 int i = 0x8000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
629
630 do {
631 autohandle += TC_H_MAKE(0x10000U, 0);
632 if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
633 autohandle = TC_H_MAKE(0x80000000U, 0);
Eric Dumazetfa0f5aa2012-01-03 00:00:11 +0000634 if (!qdisc_lookup(dev, autohandle))
635 return autohandle;
636 cond_resched();
637 } while (--i > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
Eric Dumazetfa0f5aa2012-01-03 00:00:11 +0000639 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640}
641
Patrick McHardy43effa12006-11-29 17:35:48 -0800642void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
643{
Eric Dumazet20fea082007-11-14 01:44:41 -0800644 const struct Qdisc_class_ops *cops;
Patrick McHardy43effa12006-11-29 17:35:48 -0800645 unsigned long cl;
646 u32 parentid;
647
648 if (n == 0)
649 return;
650 while ((parentid = sch->parent)) {
Jarek Poplawski066a3b52008-04-14 15:10:42 -0700651 if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
652 return;
653
David S. Miller5ce2d482008-07-08 17:06:30 -0700654 sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
Patrick McHardyffc8fef2007-07-30 17:11:50 -0700655 if (sch == NULL) {
656 WARN_ON(parentid != TC_H_ROOT);
657 return;
658 }
Patrick McHardy43effa12006-11-29 17:35:48 -0800659 cops = sch->ops->cl_ops;
660 if (cops->qlen_notify) {
661 cl = cops->get(sch, parentid);
662 cops->qlen_notify(sch, cl);
663 cops->put(sch, cl);
664 }
665 sch->q.qlen -= n;
666 }
667}
668EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
Tom Goff7316ae82010-03-19 15:40:13 +0000670static void notify_and_destroy(struct net *net, struct sk_buff *skb,
671 struct nlmsghdr *n, u32 clid,
David S. Miller99194cf2008-07-17 04:54:10 -0700672 struct Qdisc *old, struct Qdisc *new)
673{
674 if (new || old)
Tom Goff7316ae82010-03-19 15:40:13 +0000675 qdisc_notify(net, skb, n, clid, old, new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
David S. Miller4d8863a2008-08-18 21:03:15 -0700677 if (old)
David S. Miller99194cf2008-07-17 04:54:10 -0700678 qdisc_destroy(old);
David S. Miller99194cf2008-07-17 04:54:10 -0700679}
680
681/* Graft qdisc "new" to class "classid" of qdisc "parent" or
682 * to device "dev".
683 *
684 * When appropriate send a netlink notification using 'skb'
685 * and "n".
686 *
687 * On success, destroy old qdisc.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 */
689
690static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
David S. Miller99194cf2008-07-17 04:54:10 -0700691 struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
692 struct Qdisc *new, struct Qdisc *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
David S. Miller99194cf2008-07-17 04:54:10 -0700694 struct Qdisc *q = old;
Tom Goff7316ae82010-03-19 15:40:13 +0000695 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900698 if (parent == NULL) {
David S. Miller99194cf2008-07-17 04:54:10 -0700699 unsigned int i, num_q, ingress;
700
701 ingress = 0;
702 num_q = dev->num_tx_queues;
David S. Miller8d50b532008-07-30 02:37:46 -0700703 if ((q && q->flags & TCQ_F_INGRESS) ||
704 (new && new->flags & TCQ_F_INGRESS)) {
David S. Miller99194cf2008-07-17 04:54:10 -0700705 num_q = 1;
706 ingress = 1;
Eric Dumazet24824a02010-10-02 06:11:55 +0000707 if (!dev_ingress_queue(dev))
708 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 }
David S. Miller99194cf2008-07-17 04:54:10 -0700710
711 if (dev->flags & IFF_UP)
712 dev_deactivate(dev);
713
David S. Miller6ec1c692009-09-06 01:58:51 -0700714 if (new && new->ops->attach) {
715 new->ops->attach(new);
716 num_q = 0;
717 }
718
David S. Miller99194cf2008-07-17 04:54:10 -0700719 for (i = 0; i < num_q; i++) {
Eric Dumazet24824a02010-10-02 06:11:55 +0000720 struct netdev_queue *dev_queue = dev_ingress_queue(dev);
David S. Miller99194cf2008-07-17 04:54:10 -0700721
722 if (!ingress)
723 dev_queue = netdev_get_tx_queue(dev, i);
724
David S. Miller8d50b532008-07-30 02:37:46 -0700725 old = dev_graft_qdisc(dev_queue, new);
726 if (new && i > 0)
727 atomic_inc(&new->refcnt);
728
Jarek Poplawski036d6a62009-09-13 22:35:44 +0000729 if (!ingress)
730 qdisc_destroy(old);
David S. Miller99194cf2008-07-17 04:54:10 -0700731 }
732
Jarek Poplawski036d6a62009-09-13 22:35:44 +0000733 if (!ingress) {
Tom Goff7316ae82010-03-19 15:40:13 +0000734 notify_and_destroy(net, skb, n, classid,
735 dev->qdisc, new);
Jarek Poplawski036d6a62009-09-13 22:35:44 +0000736 if (new && !new->ops->attach)
737 atomic_inc(&new->refcnt);
738 dev->qdisc = new ? : &noop_qdisc;
739 } else {
Tom Goff7316ae82010-03-19 15:40:13 +0000740 notify_and_destroy(net, skb, n, classid, old, new);
Jarek Poplawski036d6a62009-09-13 22:35:44 +0000741 }
Patrick McHardyaf356af2009-09-04 06:41:18 +0000742
David S. Miller99194cf2008-07-17 04:54:10 -0700743 if (dev->flags & IFF_UP)
744 dev_activate(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 } else {
Eric Dumazet20fea082007-11-14 01:44:41 -0800746 const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747
Patrick McHardyc9f1d032009-09-04 06:41:13 +0000748 err = -EOPNOTSUPP;
749 if (cops && cops->graft) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 unsigned long cl = cops->get(parent, classid);
751 if (cl) {
David S. Miller99194cf2008-07-17 04:54:10 -0700752 err = cops->graft(parent, cl, new, &old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 cops->put(parent, cl);
Patrick McHardyc9f1d032009-09-04 06:41:13 +0000754 } else
755 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 }
David S. Miller99194cf2008-07-17 04:54:10 -0700757 if (!err)
Tom Goff7316ae82010-03-19 15:40:13 +0000758 notify_and_destroy(net, skb, n, classid, old, new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 }
760 return err;
761}
762
Jarek Poplawski25bfcd52008-08-18 20:53:34 -0700763/* lockdep annotation is needed for ingress; egress gets it only for name */
764static struct lock_class_key qdisc_tx_lock;
765static struct lock_class_key qdisc_rx_lock;
766
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767/*
768 Allocate and initialize new qdisc.
769
770 Parameters are passed via opt.
771 */
772
773static struct Qdisc *
David S. Millerbb949fb2008-07-08 16:55:56 -0700774qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
Patrick McHardy23bcf632009-09-09 18:11:23 -0700775 struct Qdisc *p, u32 parent, u32 handle,
776 struct nlattr **tca, int *errp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777{
778 int err;
Patrick McHardy1e904742008-01-22 22:11:17 -0800779 struct nlattr *kind = tca[TCA_KIND];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 struct Qdisc *sch;
781 struct Qdisc_ops *ops;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700782 struct qdisc_size_table *stab;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
784 ops = qdisc_lookup_ops(kind);
Johannes Berg95a5afc2008-10-16 15:24:51 -0700785#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 if (ops == NULL && kind != NULL) {
787 char name[IFNAMSIZ];
Patrick McHardy1e904742008-01-22 22:11:17 -0800788 if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 /* We dropped the RTNL semaphore in order to
790 * perform the module load. So, even if we
791 * succeeded in loading the module we have to
792 * tell the caller to replay the request. We
793 * indicate this using -EAGAIN.
794 * We replay the request because the device may
795 * go away in the mean time.
796 */
797 rtnl_unlock();
798 request_module("sch_%s", name);
799 rtnl_lock();
800 ops = qdisc_lookup_ops(kind);
801 if (ops != NULL) {
802 /* We will try again qdisc_lookup_ops,
803 * so don't keep a reference.
804 */
805 module_put(ops->owner);
806 err = -EAGAIN;
807 goto err_out;
808 }
809 }
810 }
811#endif
812
Jamal Hadi Salimb9e2cc02006-08-03 16:36:51 -0700813 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 if (ops == NULL)
815 goto err_out;
816
David S. Miller5ce2d482008-07-08 17:06:30 -0700817 sch = qdisc_alloc(dev_queue, ops);
Thomas Graf3d54b822005-07-05 14:15:09 -0700818 if (IS_ERR(sch)) {
819 err = PTR_ERR(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 goto err_out2;
Thomas Graf3d54b822005-07-05 14:15:09 -0700821 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822
Patrick McHardyffc8fef2007-07-30 17:11:50 -0700823 sch->parent = parent;
824
Thomas Graf3d54b822005-07-05 14:15:09 -0700825 if (handle == TC_H_INGRESS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 sch->flags |= TCQ_F_INGRESS;
Thomas Graf3d54b822005-07-05 14:15:09 -0700827 handle = TC_H_MAKE(TC_H_INGRESS, 0);
Jarek Poplawski25bfcd52008-08-18 20:53:34 -0700828 lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
Patrick McHardyfd44de72007-04-16 17:07:08 -0700829 } else {
Patrick McHardyfd44de72007-04-16 17:07:08 -0700830 if (handle == 0) {
831 handle = qdisc_alloc_handle(dev);
832 err = -ENOMEM;
833 if (handle == 0)
834 goto err_out3;
835 }
Jarek Poplawski25bfcd52008-08-18 20:53:34 -0700836 lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 }
838
Thomas Graf3d54b822005-07-05 14:15:09 -0700839 sch->handle = handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
Patrick McHardy1e904742008-01-22 22:11:17 -0800841 if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700842 if (tca[TCA_STAB]) {
843 stab = qdisc_get_stab(tca[TCA_STAB]);
844 if (IS_ERR(stab)) {
845 err = PTR_ERR(stab);
Jarek Poplawski7c64b9f2009-09-15 23:42:05 -0700846 goto err_out4;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700847 }
Eric Dumazeta2da5702011-01-20 03:48:19 +0000848 rcu_assign_pointer(sch->stab, stab);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700849 }
Patrick McHardy1e904742008-01-22 22:11:17 -0800850 if (tca[TCA_RATE]) {
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700851 spinlock_t *root_lock;
852
Patrick McHardy23bcf632009-09-09 18:11:23 -0700853 err = -EOPNOTSUPP;
854 if (sch->flags & TCQ_F_MQROOT)
855 goto err_out4;
856
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700857 if ((sch->parent != TC_H_ROOT) &&
Patrick McHardy23bcf632009-09-09 18:11:23 -0700858 !(sch->flags & TCQ_F_INGRESS) &&
859 (!p || !(p->flags & TCQ_F_MQROOT)))
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700860 root_lock = qdisc_root_sleeping_lock(sch);
861 else
862 root_lock = qdisc_lock(sch);
863
Thomas Graf023e09a2005-07-05 14:15:53 -0700864 err = gen_new_estimator(&sch->bstats, &sch->rate_est,
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700865 root_lock, tca[TCA_RATE]);
Patrick McHardy23bcf632009-09-09 18:11:23 -0700866 if (err)
867 goto err_out4;
Thomas Graf023e09a2005-07-05 14:15:53 -0700868 }
Jarek Poplawskif6e0b232008-08-22 03:24:05 -0700869
870 qdisc_list_add(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 return sch;
873 }
874err_out3:
875 dev_put(dev);
Thomas Graf3d54b822005-07-05 14:15:09 -0700876 kfree((char *) sch - sch->padded);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877err_out2:
878 module_put(ops->owner);
879err_out:
880 *errp = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 return NULL;
Patrick McHardy23bcf632009-09-09 18:11:23 -0700882
883err_out4:
884 /*
885 * Any broken qdiscs that would require a ops->reset() here?
886 * The qdisc was never in action so it shouldn't be necessary.
887 */
Eric Dumazeta2da5702011-01-20 03:48:19 +0000888 qdisc_put_stab(rtnl_dereference(sch->stab));
Patrick McHardy23bcf632009-09-09 18:11:23 -0700889 if (ops->destroy)
890 ops->destroy(sch);
891 goto err_out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892}
893
Patrick McHardy1e904742008-01-22 22:11:17 -0800894static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
Eric Dumazeta2da5702011-01-20 03:48:19 +0000896 struct qdisc_size_table *ostab, *stab = NULL;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700897 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700899 if (tca[TCA_OPTIONS]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 if (sch->ops->change == NULL)
901 return -EINVAL;
Patrick McHardy1e904742008-01-22 22:11:17 -0800902 err = sch->ops->change(sch, tca[TCA_OPTIONS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 if (err)
904 return err;
905 }
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700906
907 if (tca[TCA_STAB]) {
908 stab = qdisc_get_stab(tca[TCA_STAB]);
909 if (IS_ERR(stab))
910 return PTR_ERR(stab);
911 }
912
Eric Dumazeta2da5702011-01-20 03:48:19 +0000913 ostab = rtnl_dereference(sch->stab);
914 rcu_assign_pointer(sch->stab, stab);
915 qdisc_put_stab(ostab);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700916
Patrick McHardy23bcf632009-09-09 18:11:23 -0700917 if (tca[TCA_RATE]) {
Stephen Hemminger71bcb092008-11-25 21:13:31 -0800918 /* NB: ignores errors from replace_estimator
919 because change can't be undone. */
Patrick McHardy23bcf632009-09-09 18:11:23 -0700920 if (sch->flags & TCQ_F_MQROOT)
921 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 gen_replace_estimator(&sch->bstats, &sch->rate_est,
Stephen Hemminger71bcb092008-11-25 21:13:31 -0800923 qdisc_root_sleeping_lock(sch),
924 tca[TCA_RATE]);
Patrick McHardy23bcf632009-09-09 18:11:23 -0700925 }
926out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 return 0;
928}
929
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000930struct check_loop_arg {
931 struct qdisc_walker w;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 struct Qdisc *p;
933 int depth;
934};
935
936static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w);
937
938static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
939{
940 struct check_loop_arg arg;
941
942 if (q->ops->cl_ops == NULL)
943 return 0;
944
945 arg.w.stop = arg.w.skip = arg.w.count = 0;
946 arg.w.fn = check_loop_fn;
947 arg.depth = depth;
948 arg.p = p;
949 q->ops->cl_ops->walk(q, &arg.w);
950 return arg.w.stop ? -ELOOP : 0;
951}
952
953static int
954check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
955{
956 struct Qdisc *leaf;
Eric Dumazet20fea082007-11-14 01:44:41 -0800957 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 struct check_loop_arg *arg = (struct check_loop_arg *)w;
959
960 leaf = cops->leaf(q, cl);
961 if (leaf) {
962 if (leaf == arg->p || arg->depth > 7)
963 return -ELOOP;
964 return check_loop(leaf, arg->p, arg->depth + 1);
965 }
966 return 0;
967}
968
969/*
970 * Delete/get qdisc.
971 */
972
973static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
974{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900975 struct net *net = sock_net(skb->sk);
David S. Miller02ef22c2012-06-26 21:50:05 -0700976 struct tcmsg *tcm = nlmsg_data(n);
Patrick McHardy1e904742008-01-22 22:11:17 -0800977 struct nlattr *tca[TCA_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 struct net_device *dev;
979 u32 clid = tcm->tcm_parent;
980 struct Qdisc *q = NULL;
981 struct Qdisc *p = NULL;
982 int err;
983
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000984 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
985 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 return -ENODEV;
987
Patrick McHardy1e904742008-01-22 22:11:17 -0800988 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
989 if (err < 0)
990 return err;
991
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 if (clid) {
993 if (clid != TC_H_ROOT) {
994 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000995 p = qdisc_lookup(dev, TC_H_MAJ(clid));
996 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 return -ENOENT;
998 q = qdisc_leaf(p, clid);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000999 } else if (dev_ingress_queue(dev)) {
1000 q = dev_ingress_queue(dev)->qdisc_sleeping;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001001 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 } else {
Patrick McHardyaf356af2009-09-04 06:41:18 +00001003 q = dev->qdisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 }
1005 if (!q)
1006 return -ENOENT;
1007
1008 if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
1009 return -EINVAL;
1010 } else {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001011 q = qdisc_lookup(dev, tcm->tcm_handle);
1012 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 return -ENOENT;
1014 }
1015
Patrick McHardy1e904742008-01-22 22:11:17 -08001016 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 return -EINVAL;
1018
1019 if (n->nlmsg_type == RTM_DELQDISC) {
1020 if (!clid)
1021 return -EINVAL;
1022 if (q->handle == 0)
1023 return -ENOENT;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001024 err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
1025 if (err != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 } else {
Tom Goff7316ae82010-03-19 15:40:13 +00001028 qdisc_notify(net, skb, n, clid, NULL, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 }
1030 return 0;
1031}
1032
1033/*
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001034 * Create/change qdisc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 */
1036
1037static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
1038{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001039 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 struct tcmsg *tcm;
Patrick McHardy1e904742008-01-22 22:11:17 -08001041 struct nlattr *tca[TCA_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 struct net_device *dev;
1043 u32 clid;
1044 struct Qdisc *q, *p;
1045 int err;
1046
1047replay:
1048 /* Reinit, just in case something touches this. */
David S. Miller02ef22c2012-06-26 21:50:05 -07001049 tcm = nlmsg_data(n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 clid = tcm->tcm_parent;
1051 q = p = NULL;
1052
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001053 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1054 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 return -ENODEV;
1056
Patrick McHardy1e904742008-01-22 22:11:17 -08001057 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1058 if (err < 0)
1059 return err;
1060
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 if (clid) {
1062 if (clid != TC_H_ROOT) {
1063 if (clid != TC_H_INGRESS) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001064 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1065 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 return -ENOENT;
1067 q = qdisc_leaf(p, clid);
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001068 } else if (dev_ingress_queue_create(dev)) {
1069 q = dev_ingress_queue(dev)->qdisc_sleeping;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 }
1071 } else {
Patrick McHardyaf356af2009-09-04 06:41:18 +00001072 q = dev->qdisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 }
1074
1075 /* It may be default qdisc, ignore it */
1076 if (q && q->handle == 0)
1077 q = NULL;
1078
1079 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1080 if (tcm->tcm_handle) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001081 if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 return -EEXIST;
1083 if (TC_H_MIN(tcm->tcm_handle))
1084 return -EINVAL;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001085 q = qdisc_lookup(dev, tcm->tcm_handle);
1086 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 goto create_n_graft;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001088 if (n->nlmsg_flags & NLM_F_EXCL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 return -EEXIST;
Patrick McHardy1e904742008-01-22 22:11:17 -08001090 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 return -EINVAL;
1092 if (q == p ||
1093 (p && check_loop(q, p, 0)))
1094 return -ELOOP;
1095 atomic_inc(&q->refcnt);
1096 goto graft;
1097 } else {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001098 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 goto create_n_graft;
1100
1101 /* This magic test requires explanation.
1102 *
1103 * We know, that some child q is already
1104 * attached to this parent and have choice:
1105 * either to change it or to create/graft new one.
1106 *
1107 * 1. We are allowed to create/graft only
1108 * if CREATE and REPLACE flags are set.
1109 *
1110 * 2. If EXCL is set, requestor wanted to say,
1111 * that qdisc tcm_handle is not expected
1112 * to exist, so that we choose create/graft too.
1113 *
1114 * 3. The last case is when no flags are set.
1115 * Alas, it is sort of hole in API, we
1116 * cannot decide what to do unambiguously.
1117 * For now we select create/graft, if
1118 * user gave KIND, which does not match existing.
1119 */
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001120 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1121 (n->nlmsg_flags & NLM_F_REPLACE) &&
1122 ((n->nlmsg_flags & NLM_F_EXCL) ||
Patrick McHardy1e904742008-01-22 22:11:17 -08001123 (tca[TCA_KIND] &&
1124 nla_strcmp(tca[TCA_KIND], q->ops->id))))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 goto create_n_graft;
1126 }
1127 }
1128 } else {
1129 if (!tcm->tcm_handle)
1130 return -EINVAL;
1131 q = qdisc_lookup(dev, tcm->tcm_handle);
1132 }
1133
1134 /* Change qdisc parameters */
1135 if (q == NULL)
1136 return -ENOENT;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001137 if (n->nlmsg_flags & NLM_F_EXCL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 return -EEXIST;
Patrick McHardy1e904742008-01-22 22:11:17 -08001139 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 return -EINVAL;
1141 err = qdisc_change(q, tca);
1142 if (err == 0)
Tom Goff7316ae82010-03-19 15:40:13 +00001143 qdisc_notify(net, skb, n, clid, NULL, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 return err;
1145
1146create_n_graft:
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001147 if (!(n->nlmsg_flags & NLM_F_CREATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 return -ENOENT;
Eric Dumazet24824a02010-10-02 06:11:55 +00001149 if (clid == TC_H_INGRESS) {
1150 if (dev_ingress_queue(dev))
1151 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1152 tcm->tcm_parent, tcm->tcm_parent,
1153 tca, &err);
1154 else
1155 err = -ENOENT;
1156 } else {
Jarek Poplawski926e61b2009-09-15 02:53:07 -07001157 struct netdev_queue *dev_queue;
David S. Miller6ec1c692009-09-06 01:58:51 -07001158
1159 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
Jarek Poplawski926e61b2009-09-15 02:53:07 -07001160 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1161 else if (p)
1162 dev_queue = p->dev_queue;
1163 else
1164 dev_queue = netdev_get_tx_queue(dev, 0);
David S. Miller6ec1c692009-09-06 01:58:51 -07001165
Jarek Poplawski926e61b2009-09-15 02:53:07 -07001166 q = qdisc_create(dev, dev_queue, p,
David S. Millerbb949fb2008-07-08 16:55:56 -07001167 tcm->tcm_parent, tcm->tcm_handle,
Patrick McHardyffc8fef2007-07-30 17:11:50 -07001168 tca, &err);
David S. Miller6ec1c692009-09-06 01:58:51 -07001169 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 if (q == NULL) {
1171 if (err == -EAGAIN)
1172 goto replay;
1173 return err;
1174 }
1175
1176graft:
Ilpo Järvinene5befbd2008-08-18 22:30:01 -07001177 err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
1178 if (err) {
1179 if (q)
1180 qdisc_destroy(q);
1181 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 }
Ilpo Järvinene5befbd2008-08-18 22:30:01 -07001183
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 return 0;
1185}
1186
1187static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -07001188 u32 pid, u32 seq, u16 flags, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189{
1190 struct tcmsg *tcm;
1191 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001192 unsigned char *b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 struct gnet_dump d;
Eric Dumazeta2da5702011-01-20 03:48:19 +00001194 struct qdisc_size_table *stab;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
David S. Miller02ef22c2012-06-26 21:50:05 -07001196 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*tcm), flags);
1197 if (!nlh)
1198 goto out_nlmsg_trim;
1199 tcm = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 tcm->tcm_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -07001201 tcm->tcm__pad1 = 0;
1202 tcm->tcm__pad2 = 0;
David S. Miller5ce2d482008-07-08 17:06:30 -07001203 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 tcm->tcm_parent = clid;
1205 tcm->tcm_handle = q->handle;
1206 tcm->tcm_info = atomic_read(&q->refcnt);
David S. Miller1b34ec42012-03-29 05:11:39 -04001207 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1208 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 if (q->ops->dump && q->ops->dump(q, skb) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001210 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 q->qstats.qlen = q->q.qlen;
1212
Eric Dumazeta2da5702011-01-20 03:48:19 +00001213 stab = rtnl_dereference(q->stab);
1214 if (stab && qdisc_dump_stab(skb, stab) < 0)
Jussi Kivilinna175f9c12008-07-20 00:08:47 -07001215 goto nla_put_failure;
1216
Jarek Poplawski102396a2008-08-29 14:21:52 -07001217 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1218 qdisc_root_sleeping_lock(q), &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001219 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220
1221 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001222 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223
1224 if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
Eric Dumazetd250a5f2009-10-02 10:32:18 +00001225 gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 gnet_stats_copy_queue(&d, &q->qstats) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001227 goto nla_put_failure;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001228
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 if (gnet_stats_finish_copy(&d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001230 goto nla_put_failure;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001231
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001232 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 return skb->len;
1234
David S. Miller02ef22c2012-06-26 21:50:05 -07001235out_nlmsg_trim:
Patrick McHardy1e904742008-01-22 22:11:17 -08001236nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001237 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 return -1;
1239}
1240
Eric Dumazet53b0f082010-05-22 20:37:44 +00001241static bool tc_qdisc_dump_ignore(struct Qdisc *q)
1242{
1243 return (q->flags & TCQ_F_BUILTIN) ? true : false;
1244}
1245
Tom Goff7316ae82010-03-19 15:40:13 +00001246static int qdisc_notify(struct net *net, struct sk_buff *oskb,
1247 struct nlmsghdr *n, u32 clid,
1248 struct Qdisc *old, struct Qdisc *new)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249{
1250 struct sk_buff *skb;
1251 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
1252
1253 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1254 if (!skb)
1255 return -ENOBUFS;
1256
Eric Dumazet53b0f082010-05-22 20:37:44 +00001257 if (old && !tc_qdisc_dump_ignore(old)) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001258 if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq,
1259 0, RTM_DELQDISC) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 goto err_out;
1261 }
Eric Dumazet53b0f082010-05-22 20:37:44 +00001262 if (new && !tc_qdisc_dump_ignore(new)) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001263 if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq,
1264 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 goto err_out;
1266 }
1267
1268 if (skb->len)
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001269 return rtnetlink_send(skb, net, pid, RTNLGRP_TC,
1270 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271
1272err_out:
1273 kfree_skb(skb);
1274 return -EINVAL;
1275}
1276
David S. Miller30723672008-07-18 22:50:15 -07001277static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1278 struct netlink_callback *cb,
1279 int *q_idx_p, int s_q_idx)
1280{
1281 int ret = 0, q_idx = *q_idx_p;
1282 struct Qdisc *q;
1283
1284 if (!root)
1285 return 0;
1286
1287 q = root;
1288 if (q_idx < s_q_idx) {
1289 q_idx++;
1290 } else {
1291 if (!tc_qdisc_dump_ignore(q) &&
1292 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid,
1293 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1294 goto done;
1295 q_idx++;
1296 }
1297 list_for_each_entry(q, &root->list, list) {
1298 if (q_idx < s_q_idx) {
1299 q_idx++;
1300 continue;
1301 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001302 if (!tc_qdisc_dump_ignore(q) &&
David S. Miller30723672008-07-18 22:50:15 -07001303 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid,
1304 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1305 goto done;
1306 q_idx++;
1307 }
1308
1309out:
1310 *q_idx_p = q_idx;
1311 return ret;
1312done:
1313 ret = -1;
1314 goto out;
1315}
1316
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1318{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001319 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 int idx, q_idx;
1321 int s_idx, s_q_idx;
1322 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323
1324 s_idx = cb->args[0];
1325 s_q_idx = q_idx = cb->args[1];
stephen hemmingerf1e90162009-11-10 07:54:49 +00001326
1327 rcu_read_lock();
Pavel Emelianov7562f872007-05-03 15:13:45 -07001328 idx = 0;
Tom Goff7316ae82010-03-19 15:40:13 +00001329 for_each_netdev_rcu(net, dev) {
David S. Miller30723672008-07-18 22:50:15 -07001330 struct netdev_queue *dev_queue;
1331
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 if (idx < s_idx)
Pavel Emelianov7562f872007-05-03 15:13:45 -07001333 goto cont;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 if (idx > s_idx)
1335 s_q_idx = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 q_idx = 0;
David S. Miller30723672008-07-18 22:50:15 -07001337
Patrick McHardyaf356af2009-09-04 06:41:18 +00001338 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001339 goto done;
1340
Eric Dumazet24824a02010-10-02 06:11:55 +00001341 dev_queue = dev_ingress_queue(dev);
1342 if (dev_queue &&
1343 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1344 &q_idx, s_q_idx) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001345 goto done;
1346
Pavel Emelianov7562f872007-05-03 15:13:45 -07001347cont:
1348 idx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 }
1350
1351done:
stephen hemmingerf1e90162009-11-10 07:54:49 +00001352 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
1354 cb->args[0] = idx;
1355 cb->args[1] = q_idx;
1356
1357 return skb->len;
1358}
1359
1360
1361
1362/************************************************
1363 * Traffic classes manipulation. *
1364 ************************************************/
1365
1366
1367
1368static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
1369{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001370 struct net *net = sock_net(skb->sk);
David S. Miller02ef22c2012-06-26 21:50:05 -07001371 struct tcmsg *tcm = nlmsg_data(n);
Patrick McHardy1e904742008-01-22 22:11:17 -08001372 struct nlattr *tca[TCA_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 struct net_device *dev;
1374 struct Qdisc *q = NULL;
Eric Dumazet20fea082007-11-14 01:44:41 -08001375 const struct Qdisc_class_ops *cops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 unsigned long cl = 0;
1377 unsigned long new_cl;
1378 u32 pid = tcm->tcm_parent;
1379 u32 clid = tcm->tcm_handle;
1380 u32 qid = TC_H_MAJ(clid);
1381 int err;
1382
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001383 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1384 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 return -ENODEV;
1386
Patrick McHardy1e904742008-01-22 22:11:17 -08001387 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1388 if (err < 0)
1389 return err;
1390
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 /*
1392 parent == TC_H_UNSPEC - unspecified parent.
1393 parent == TC_H_ROOT - class is root, which has no parent.
1394 parent == X:0 - parent is root class.
1395 parent == X:Y - parent is a node in hierarchy.
1396 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1397
1398 handle == 0:0 - generate handle from kernel pool.
1399 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1400 handle == X:Y - clear.
1401 handle == X:0 - root class.
1402 */
1403
1404 /* Step 1. Determine qdisc handle X:0 */
1405
1406 if (pid != TC_H_ROOT) {
1407 u32 qid1 = TC_H_MAJ(pid);
1408
1409 if (qid && qid1) {
1410 /* If both majors are known, they must be identical. */
1411 if (qid != qid1)
1412 return -EINVAL;
1413 } else if (qid1) {
1414 qid = qid1;
1415 } else if (qid == 0)
Patrick McHardyaf356af2009-09-04 06:41:18 +00001416 qid = dev->qdisc->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417
1418 /* Now qid is genuine qdisc handle consistent
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001419 * both with parent and child.
1420 *
1421 * TC_H_MAJ(pid) still may be unspecified, complete it now.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 */
1423 if (pid)
1424 pid = TC_H_MAKE(qid, pid);
1425 } else {
1426 if (qid == 0)
Patrick McHardyaf356af2009-09-04 06:41:18 +00001427 qid = dev->qdisc->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 }
1429
1430 /* OK. Locate qdisc */
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001431 q = qdisc_lookup(dev, qid);
1432 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 return -ENOENT;
1434
1435 /* An check that it supports classes */
1436 cops = q->ops->cl_ops;
1437 if (cops == NULL)
1438 return -EINVAL;
1439
1440 /* Now try to get class */
1441 if (clid == 0) {
1442 if (pid == TC_H_ROOT)
1443 clid = qid;
1444 } else
1445 clid = TC_H_MAKE(qid, clid);
1446
1447 if (clid)
1448 cl = cops->get(q, clid);
1449
1450 if (cl == 0) {
1451 err = -ENOENT;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001452 if (n->nlmsg_type != RTM_NEWTCLASS ||
1453 !(n->nlmsg_flags & NLM_F_CREATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 goto out;
1455 } else {
1456 switch (n->nlmsg_type) {
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001457 case RTM_NEWTCLASS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 err = -EEXIST;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001459 if (n->nlmsg_flags & NLM_F_EXCL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 goto out;
1461 break;
1462 case RTM_DELTCLASS:
Patrick McHardyde6d5cd2009-09-04 06:41:16 +00001463 err = -EOPNOTSUPP;
1464 if (cops->delete)
1465 err = cops->delete(q, cl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 if (err == 0)
Tom Goff7316ae82010-03-19 15:40:13 +00001467 tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 goto out;
1469 case RTM_GETTCLASS:
Tom Goff7316ae82010-03-19 15:40:13 +00001470 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 goto out;
1472 default:
1473 err = -EINVAL;
1474 goto out;
1475 }
1476 }
1477
1478 new_cl = cl;
Patrick McHardyde6d5cd2009-09-04 06:41:16 +00001479 err = -EOPNOTSUPP;
1480 if (cops->change)
1481 err = cops->change(q, clid, pid, tca, &new_cl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 if (err == 0)
Tom Goff7316ae82010-03-19 15:40:13 +00001483 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
1485out:
1486 if (cl)
1487 cops->put(q, cl);
1488
1489 return err;
1490}
1491
1492
1493static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1494 unsigned long cl,
Jamal Hadi Salime431b8c2005-06-18 22:55:31 -07001495 u32 pid, u32 seq, u16 flags, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496{
1497 struct tcmsg *tcm;
1498 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001499 unsigned char *b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 struct gnet_dump d;
Eric Dumazet20fea082007-11-14 01:44:41 -08001501 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502
David S. Miller02ef22c2012-06-26 21:50:05 -07001503 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*tcm), flags);
1504 if (!nlh)
1505 goto out_nlmsg_trim;
1506 tcm = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 tcm->tcm_family = AF_UNSPEC;
Eric Dumazet16ebb5e2009-09-02 02:40:09 +00001508 tcm->tcm__pad1 = 0;
1509 tcm->tcm__pad2 = 0;
David S. Miller5ce2d482008-07-08 17:06:30 -07001510 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 tcm->tcm_parent = q->handle;
1512 tcm->tcm_handle = q->handle;
1513 tcm->tcm_info = 0;
David S. Miller1b34ec42012-03-29 05:11:39 -04001514 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1515 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001517 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518
Jarek Poplawski102396a2008-08-29 14:21:52 -07001519 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1520 qdisc_root_sleeping_lock(q), &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001521 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
1523 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001524 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525
1526 if (gnet_stats_finish_copy(&d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001527 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001529 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 return skb->len;
1531
David S. Miller02ef22c2012-06-26 21:50:05 -07001532out_nlmsg_trim:
Patrick McHardy1e904742008-01-22 22:11:17 -08001533nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001534 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 return -1;
1536}
1537
Tom Goff7316ae82010-03-19 15:40:13 +00001538static int tclass_notify(struct net *net, struct sk_buff *oskb,
1539 struct nlmsghdr *n, struct Qdisc *q,
1540 unsigned long cl, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541{
1542 struct sk_buff *skb;
1543 u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
1544
1545 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1546 if (!skb)
1547 return -ENOBUFS;
1548
1549 if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) {
1550 kfree_skb(skb);
1551 return -EINVAL;
1552 }
1553
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001554 return rtnetlink_send(skb, net, pid, RTNLGRP_TC,
1555 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556}
1557
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001558struct qdisc_dump_args {
1559 struct qdisc_walker w;
1560 struct sk_buff *skb;
1561 struct netlink_callback *cb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562};
1563
1564static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg)
1565{
1566 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
1567
1568 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid,
1569 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS);
1570}
1571
David S. Miller30723672008-07-18 22:50:15 -07001572static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
1573 struct tcmsg *tcm, struct netlink_callback *cb,
1574 int *t_p, int s_t)
1575{
1576 struct qdisc_dump_args arg;
1577
1578 if (tc_qdisc_dump_ignore(q) ||
1579 *t_p < s_t || !q->ops->cl_ops ||
1580 (tcm->tcm_parent &&
1581 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
1582 (*t_p)++;
1583 return 0;
1584 }
1585 if (*t_p > s_t)
1586 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
1587 arg.w.fn = qdisc_class_dump;
1588 arg.skb = skb;
1589 arg.cb = cb;
1590 arg.w.stop = 0;
1591 arg.w.skip = cb->args[1];
1592 arg.w.count = 0;
1593 q->ops->cl_ops->walk(q, &arg.w);
1594 cb->args[1] = arg.w.count;
1595 if (arg.w.stop)
1596 return -1;
1597 (*t_p)++;
1598 return 0;
1599}
1600
1601static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
1602 struct tcmsg *tcm, struct netlink_callback *cb,
1603 int *t_p, int s_t)
1604{
1605 struct Qdisc *q;
1606
1607 if (!root)
1608 return 0;
1609
1610 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
1611 return -1;
1612
1613 list_for_each_entry(q, &root->list, list) {
1614 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
1615 return -1;
1616 }
1617
1618 return 0;
1619}
1620
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
1622{
David S. Miller02ef22c2012-06-26 21:50:05 -07001623 struct tcmsg *tcm = nlmsg_data(cb->nlh);
David S. Miller30723672008-07-18 22:50:15 -07001624 struct net *net = sock_net(skb->sk);
1625 struct netdev_queue *dev_queue;
1626 struct net_device *dev;
1627 int t, s_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628
1629 if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
1630 return 0;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001631 dev = dev_get_by_index(net, tcm->tcm_ifindex);
1632 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633 return 0;
1634
1635 s_t = cb->args[0];
1636 t = 0;
1637
Patrick McHardyaf356af2009-09-04 06:41:18 +00001638 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001639 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640
Eric Dumazet24824a02010-10-02 06:11:55 +00001641 dev_queue = dev_ingress_queue(dev);
1642 if (dev_queue &&
1643 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
1644 &t, s_t) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001645 goto done;
1646
1647done:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 cb->args[0] = t;
1649
1650 dev_put(dev);
1651 return skb->len;
1652}
1653
1654/* Main classifier routine: scans classifier chain attached
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001655 * to this qdisc, (optionally) tests for protocol and asks
1656 * specific classifiers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657 */
Eric Dumazetdc7f9f62011-07-05 23:25:42 +00001658int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
Patrick McHardy73ca4912007-07-15 00:02:31 -07001659 struct tcf_result *res)
1660{
1661 __be16 protocol = skb->protocol;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001662 int err;
Patrick McHardy73ca4912007-07-15 00:02:31 -07001663
1664 for (; tp; tp = tp->next) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001665 if (tp->protocol != protocol &&
1666 tp->protocol != htons(ETH_P_ALL))
1667 continue;
1668 err = tp->classify(skb, tp, res);
1669
1670 if (err >= 0) {
Patrick McHardy73ca4912007-07-15 00:02:31 -07001671#ifdef CONFIG_NET_CLS_ACT
1672 if (err != TC_ACT_RECLASSIFY && skb->tc_verd)
1673 skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0);
1674#endif
1675 return err;
1676 }
1677 }
1678 return -1;
1679}
1680EXPORT_SYMBOL(tc_classify_compat);
1681
Eric Dumazetdc7f9f62011-07-05 23:25:42 +00001682int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
Patrick McHardy73ca4912007-07-15 00:02:31 -07001683 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684{
1685 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686#ifdef CONFIG_NET_CLS_ACT
Eric Dumazetdc7f9f62011-07-05 23:25:42 +00001687 const struct tcf_proto *otp = tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688reclassify:
Hagen Paul Pfeifer52bc9742011-02-25 05:45:21 +00001689#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690
Patrick McHardy73ca4912007-07-15 00:02:31 -07001691 err = tc_classify_compat(skb, tp, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692#ifdef CONFIG_NET_CLS_ACT
Patrick McHardy73ca4912007-07-15 00:02:31 -07001693 if (err == TC_ACT_RECLASSIFY) {
1694 u32 verd = G_TC_VERD(skb->tc_verd);
1695 tp = otp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696
Patrick McHardy73ca4912007-07-15 00:02:31 -07001697 if (verd++ >= MAX_REC_LOOP) {
Joe Perchese87cc472012-05-13 21:56:26 +00001698 net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n",
1699 tp->q->ops->id,
1700 tp->prio & 0xffff,
1701 ntohs(tp->protocol));
Patrick McHardy73ca4912007-07-15 00:02:31 -07001702 return TC_ACT_SHOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 }
Patrick McHardy73ca4912007-07-15 00:02:31 -07001704 skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd);
1705 goto reclassify;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706 }
Patrick McHardy73ca4912007-07-15 00:02:31 -07001707#endif
1708 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709}
Patrick McHardy73ca4912007-07-15 00:02:31 -07001710EXPORT_SYMBOL(tc_classify);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711
Patrick McHardya48b5a62007-03-23 11:29:43 -07001712void tcf_destroy(struct tcf_proto *tp)
1713{
1714 tp->ops->destroy(tp);
1715 module_put(tp->ops->owner);
1716 kfree(tp);
1717}
1718
Patrick McHardyff31ab52008-07-01 19:52:38 -07001719void tcf_destroy_chain(struct tcf_proto **fl)
Patrick McHardya48b5a62007-03-23 11:29:43 -07001720{
1721 struct tcf_proto *tp;
1722
Patrick McHardyff31ab52008-07-01 19:52:38 -07001723 while ((tp = *fl) != NULL) {
1724 *fl = tp->next;
Patrick McHardya48b5a62007-03-23 11:29:43 -07001725 tcf_destroy(tp);
1726 }
1727}
1728EXPORT_SYMBOL(tcf_destroy_chain);
1729
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730#ifdef CONFIG_PROC_FS
1731static int psched_show(struct seq_file *seq, void *v)
1732{
Patrick McHardy3c0cfc12007-10-10 16:32:41 -07001733 struct timespec ts;
1734
1735 hrtimer_get_res(CLOCK_MONOTONIC, &ts);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736 seq_printf(seq, "%08x %08x %08x %08x\n",
Jarek Poplawskica44d6e2009-06-15 02:31:47 -07001737 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
Patrick McHardy514bca32007-03-16 12:34:52 -07001738 1000000,
Patrick McHardy3c0cfc12007-10-10 16:32:41 -07001739 (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740
1741 return 0;
1742}
1743
1744static int psched_open(struct inode *inode, struct file *file)
1745{
Tom Goff7e5ab152010-03-30 19:44:56 -07001746 return single_open(file, psched_show, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747}
1748
Arjan van de Venda7071d2007-02-12 00:55:36 -08001749static const struct file_operations psched_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 .owner = THIS_MODULE,
1751 .open = psched_open,
1752 .read = seq_read,
1753 .llseek = seq_lseek,
1754 .release = single_release,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001755};
Tom Goff7316ae82010-03-19 15:40:13 +00001756
1757static int __net_init psched_net_init(struct net *net)
1758{
1759 struct proc_dir_entry *e;
1760
1761 e = proc_net_fops_create(net, "psched", 0, &psched_fops);
1762 if (e == NULL)
1763 return -ENOMEM;
1764
1765 return 0;
1766}
1767
1768static void __net_exit psched_net_exit(struct net *net)
1769{
1770 proc_net_remove(net, "psched");
Tom Goff7316ae82010-03-19 15:40:13 +00001771}
1772#else
1773static int __net_init psched_net_init(struct net *net)
1774{
1775 return 0;
1776}
1777
1778static void __net_exit psched_net_exit(struct net *net)
1779{
1780}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781#endif
1782
Tom Goff7316ae82010-03-19 15:40:13 +00001783static struct pernet_operations psched_net_ops = {
1784 .init = psched_net_init,
1785 .exit = psched_net_exit,
1786};
1787
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788static int __init pktsched_init(void)
1789{
Tom Goff7316ae82010-03-19 15:40:13 +00001790 int err;
1791
1792 err = register_pernet_subsys(&psched_net_ops);
1793 if (err) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001794 pr_err("pktsched_init: "
Tom Goff7316ae82010-03-19 15:40:13 +00001795 "cannot initialize per netns operations\n");
1796 return err;
1797 }
1798
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799 register_qdisc(&pfifo_qdisc_ops);
1800 register_qdisc(&bfifo_qdisc_ops);
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +00001801 register_qdisc(&pfifo_head_drop_qdisc_ops);
David S. Miller6ec1c692009-09-06 01:58:51 -07001802 register_qdisc(&mq_qdisc_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803
Greg Rosec7ac8672011-06-10 01:27:09 +00001804 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
1805 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
1806 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL);
1807 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
1808 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
1809 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL);
Thomas Grafbe577dd2007-03-22 11:55:50 -07001810
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 return 0;
1812}
1813
1814subsys_initcall(pktsched_init);