blob: d84f7e734cd74071144020490862d91c65855ee9 [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{
Jarek Poplawski2540e052008-08-21 05:11:14 -0700498 if (test_bit(__QDISC_STATE_DEACTIVATED,
499 &qdisc_root_sleeping(wd->qdisc)->state))
500 return;
501
Eric Dumazetfd245a42011-01-20 05:27:16 +0000502 qdisc_throttled(wd->qdisc);
Eric Dumazet46baac32012-10-20 00:40:51 +0000503
504 hrtimer_start(&wd->timer,
505 ns_to_ktime(PSCHED_TICKS2NS(expires)),
506 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);
Eric Dumazet1abbe132012-12-11 15:54:33 +0000836 if (!netif_is_multiqueue(dev))
837 sch->flags |= TCQ_F_ONETXQUEUE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 }
839
Thomas Graf3d54b822005-07-05 14:15:09 -0700840 sch->handle = handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Patrick McHardy1e904742008-01-22 22:11:17 -0800842 if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700843 if (tca[TCA_STAB]) {
844 stab = qdisc_get_stab(tca[TCA_STAB]);
845 if (IS_ERR(stab)) {
846 err = PTR_ERR(stab);
Jarek Poplawski7c64b9f2009-09-15 23:42:05 -0700847 goto err_out4;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700848 }
Eric Dumazeta2da5702011-01-20 03:48:19 +0000849 rcu_assign_pointer(sch->stab, stab);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700850 }
Patrick McHardy1e904742008-01-22 22:11:17 -0800851 if (tca[TCA_RATE]) {
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700852 spinlock_t *root_lock;
853
Patrick McHardy23bcf632009-09-09 18:11:23 -0700854 err = -EOPNOTSUPP;
855 if (sch->flags & TCQ_F_MQROOT)
856 goto err_out4;
857
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700858 if ((sch->parent != TC_H_ROOT) &&
Patrick McHardy23bcf632009-09-09 18:11:23 -0700859 !(sch->flags & TCQ_F_INGRESS) &&
860 (!p || !(p->flags & TCQ_F_MQROOT)))
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700861 root_lock = qdisc_root_sleeping_lock(sch);
862 else
863 root_lock = qdisc_lock(sch);
864
Thomas Graf023e09a2005-07-05 14:15:53 -0700865 err = gen_new_estimator(&sch->bstats, &sch->rate_est,
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700866 root_lock, tca[TCA_RATE]);
Patrick McHardy23bcf632009-09-09 18:11:23 -0700867 if (err)
868 goto err_out4;
Thomas Graf023e09a2005-07-05 14:15:53 -0700869 }
Jarek Poplawskif6e0b232008-08-22 03:24:05 -0700870
871 qdisc_list_add(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 return sch;
874 }
875err_out3:
876 dev_put(dev);
Thomas Graf3d54b822005-07-05 14:15:09 -0700877 kfree((char *) sch - sch->padded);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878err_out2:
879 module_put(ops->owner);
880err_out:
881 *errp = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 return NULL;
Patrick McHardy23bcf632009-09-09 18:11:23 -0700883
884err_out4:
885 /*
886 * Any broken qdiscs that would require a ops->reset() here?
887 * The qdisc was never in action so it shouldn't be necessary.
888 */
Eric Dumazeta2da5702011-01-20 03:48:19 +0000889 qdisc_put_stab(rtnl_dereference(sch->stab));
Patrick McHardy23bcf632009-09-09 18:11:23 -0700890 if (ops->destroy)
891 ops->destroy(sch);
892 goto err_out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893}
894
Patrick McHardy1e904742008-01-22 22:11:17 -0800895static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896{
Eric Dumazeta2da5702011-01-20 03:48:19 +0000897 struct qdisc_size_table *ostab, *stab = NULL;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700898 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700900 if (tca[TCA_OPTIONS]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 if (sch->ops->change == NULL)
902 return -EINVAL;
Patrick McHardy1e904742008-01-22 22:11:17 -0800903 err = sch->ops->change(sch, tca[TCA_OPTIONS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 if (err)
905 return err;
906 }
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700907
908 if (tca[TCA_STAB]) {
909 stab = qdisc_get_stab(tca[TCA_STAB]);
910 if (IS_ERR(stab))
911 return PTR_ERR(stab);
912 }
913
Eric Dumazeta2da5702011-01-20 03:48:19 +0000914 ostab = rtnl_dereference(sch->stab);
915 rcu_assign_pointer(sch->stab, stab);
916 qdisc_put_stab(ostab);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700917
Patrick McHardy23bcf632009-09-09 18:11:23 -0700918 if (tca[TCA_RATE]) {
Stephen Hemminger71bcb092008-11-25 21:13:31 -0800919 /* NB: ignores errors from replace_estimator
920 because change can't be undone. */
Patrick McHardy23bcf632009-09-09 18:11:23 -0700921 if (sch->flags & TCQ_F_MQROOT)
922 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 gen_replace_estimator(&sch->bstats, &sch->rate_est,
Stephen Hemminger71bcb092008-11-25 21:13:31 -0800924 qdisc_root_sleeping_lock(sch),
925 tca[TCA_RATE]);
Patrick McHardy23bcf632009-09-09 18:11:23 -0700926 }
927out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 return 0;
929}
930
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000931struct check_loop_arg {
932 struct qdisc_walker w;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 struct Qdisc *p;
934 int depth;
935};
936
937static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w);
938
939static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
940{
941 struct check_loop_arg arg;
942
943 if (q->ops->cl_ops == NULL)
944 return 0;
945
946 arg.w.stop = arg.w.skip = arg.w.count = 0;
947 arg.w.fn = check_loop_fn;
948 arg.depth = depth;
949 arg.p = p;
950 q->ops->cl_ops->walk(q, &arg.w);
951 return arg.w.stop ? -ELOOP : 0;
952}
953
954static int
955check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
956{
957 struct Qdisc *leaf;
Eric Dumazet20fea082007-11-14 01:44:41 -0800958 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 struct check_loop_arg *arg = (struct check_loop_arg *)w;
960
961 leaf = cops->leaf(q, cl);
962 if (leaf) {
963 if (leaf == arg->p || arg->depth > 7)
964 return -ELOOP;
965 return check_loop(leaf, arg->p, arg->depth + 1);
966 }
967 return 0;
968}
969
970/*
971 * Delete/get qdisc.
972 */
973
974static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
975{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900976 struct net *net = sock_net(skb->sk);
David S. Miller02ef22c2012-06-26 21:50:05 -0700977 struct tcmsg *tcm = nlmsg_data(n);
Patrick McHardy1e904742008-01-22 22:11:17 -0800978 struct nlattr *tca[TCA_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 struct net_device *dev;
980 u32 clid = tcm->tcm_parent;
981 struct Qdisc *q = NULL;
982 struct Qdisc *p = NULL;
983 int err;
984
Eric W. Biedermandfc47ef2012-11-16 03:03:00 +0000985 if ((n->nlmsg_type != RTM_GETQDISC) && !capable(CAP_NET_ADMIN))
986 return -EPERM;
987
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000988 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
989 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 return -ENODEV;
991
Patrick McHardy1e904742008-01-22 22:11:17 -0800992 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
993 if (err < 0)
994 return err;
995
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 if (clid) {
997 if (clid != TC_H_ROOT) {
998 if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000999 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1000 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 return -ENOENT;
1002 q = qdisc_leaf(p, clid);
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001003 } else if (dev_ingress_queue(dev)) {
1004 q = dev_ingress_queue(dev)->qdisc_sleeping;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001005 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 } else {
Patrick McHardyaf356af2009-09-04 06:41:18 +00001007 q = dev->qdisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 }
1009 if (!q)
1010 return -ENOENT;
1011
1012 if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
1013 return -EINVAL;
1014 } else {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001015 q = qdisc_lookup(dev, tcm->tcm_handle);
1016 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 return -ENOENT;
1018 }
1019
Patrick McHardy1e904742008-01-22 22:11:17 -08001020 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 return -EINVAL;
1022
1023 if (n->nlmsg_type == RTM_DELQDISC) {
1024 if (!clid)
1025 return -EINVAL;
1026 if (q->handle == 0)
1027 return -ENOENT;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001028 err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
1029 if (err != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 } else {
Tom Goff7316ae82010-03-19 15:40:13 +00001032 qdisc_notify(net, skb, n, clid, NULL, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 }
1034 return 0;
1035}
1036
1037/*
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001038 * Create/change qdisc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 */
1040
1041static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
1042{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001043 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 struct tcmsg *tcm;
Patrick McHardy1e904742008-01-22 22:11:17 -08001045 struct nlattr *tca[TCA_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 struct net_device *dev;
1047 u32 clid;
1048 struct Qdisc *q, *p;
1049 int err;
1050
Eric W. Biedermandfc47ef2012-11-16 03:03:00 +00001051 if (!capable(CAP_NET_ADMIN))
1052 return -EPERM;
1053
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054replay:
1055 /* Reinit, just in case something touches this. */
David S. Miller02ef22c2012-06-26 21:50:05 -07001056 tcm = nlmsg_data(n);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 clid = tcm->tcm_parent;
1058 q = p = NULL;
1059
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001060 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1061 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 return -ENODEV;
1063
Patrick McHardy1e904742008-01-22 22:11:17 -08001064 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1065 if (err < 0)
1066 return err;
1067
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 if (clid) {
1069 if (clid != TC_H_ROOT) {
1070 if (clid != TC_H_INGRESS) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001071 p = qdisc_lookup(dev, TC_H_MAJ(clid));
1072 if (!p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 return -ENOENT;
1074 q = qdisc_leaf(p, clid);
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001075 } else if (dev_ingress_queue_create(dev)) {
1076 q = dev_ingress_queue(dev)->qdisc_sleeping;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 }
1078 } else {
Patrick McHardyaf356af2009-09-04 06:41:18 +00001079 q = dev->qdisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 }
1081
1082 /* It may be default qdisc, ignore it */
1083 if (q && q->handle == 0)
1084 q = NULL;
1085
1086 if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
1087 if (tcm->tcm_handle) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001088 if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 return -EEXIST;
1090 if (TC_H_MIN(tcm->tcm_handle))
1091 return -EINVAL;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001092 q = qdisc_lookup(dev, tcm->tcm_handle);
1093 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 goto create_n_graft;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001095 if (n->nlmsg_flags & NLM_F_EXCL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 return -EEXIST;
Patrick McHardy1e904742008-01-22 22:11:17 -08001097 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 return -EINVAL;
1099 if (q == p ||
1100 (p && check_loop(q, p, 0)))
1101 return -ELOOP;
1102 atomic_inc(&q->refcnt);
1103 goto graft;
1104 } else {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001105 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 goto create_n_graft;
1107
1108 /* This magic test requires explanation.
1109 *
1110 * We know, that some child q is already
1111 * attached to this parent and have choice:
1112 * either to change it or to create/graft new one.
1113 *
1114 * 1. We are allowed to create/graft only
1115 * if CREATE and REPLACE flags are set.
1116 *
1117 * 2. If EXCL is set, requestor wanted to say,
1118 * that qdisc tcm_handle is not expected
1119 * to exist, so that we choose create/graft too.
1120 *
1121 * 3. The last case is when no flags are set.
1122 * Alas, it is sort of hole in API, we
1123 * cannot decide what to do unambiguously.
1124 * For now we select create/graft, if
1125 * user gave KIND, which does not match existing.
1126 */
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001127 if ((n->nlmsg_flags & NLM_F_CREATE) &&
1128 (n->nlmsg_flags & NLM_F_REPLACE) &&
1129 ((n->nlmsg_flags & NLM_F_EXCL) ||
Patrick McHardy1e904742008-01-22 22:11:17 -08001130 (tca[TCA_KIND] &&
1131 nla_strcmp(tca[TCA_KIND], q->ops->id))))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 goto create_n_graft;
1133 }
1134 }
1135 } else {
1136 if (!tcm->tcm_handle)
1137 return -EINVAL;
1138 q = qdisc_lookup(dev, tcm->tcm_handle);
1139 }
1140
1141 /* Change qdisc parameters */
1142 if (q == NULL)
1143 return -ENOENT;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001144 if (n->nlmsg_flags & NLM_F_EXCL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 return -EEXIST;
Patrick McHardy1e904742008-01-22 22:11:17 -08001146 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 return -EINVAL;
1148 err = qdisc_change(q, tca);
1149 if (err == 0)
Tom Goff7316ae82010-03-19 15:40:13 +00001150 qdisc_notify(net, skb, n, clid, NULL, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 return err;
1152
1153create_n_graft:
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001154 if (!(n->nlmsg_flags & NLM_F_CREATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 return -ENOENT;
Eric Dumazet24824a02010-10-02 06:11:55 +00001156 if (clid == TC_H_INGRESS) {
1157 if (dev_ingress_queue(dev))
1158 q = qdisc_create(dev, dev_ingress_queue(dev), p,
1159 tcm->tcm_parent, tcm->tcm_parent,
1160 tca, &err);
1161 else
1162 err = -ENOENT;
1163 } else {
Jarek Poplawski926e61b2009-09-15 02:53:07 -07001164 struct netdev_queue *dev_queue;
David S. Miller6ec1c692009-09-06 01:58:51 -07001165
1166 if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
Jarek Poplawski926e61b2009-09-15 02:53:07 -07001167 dev_queue = p->ops->cl_ops->select_queue(p, tcm);
1168 else if (p)
1169 dev_queue = p->dev_queue;
1170 else
1171 dev_queue = netdev_get_tx_queue(dev, 0);
David S. Miller6ec1c692009-09-06 01:58:51 -07001172
Jarek Poplawski926e61b2009-09-15 02:53:07 -07001173 q = qdisc_create(dev, dev_queue, p,
David S. Millerbb949fb2008-07-08 16:55:56 -07001174 tcm->tcm_parent, tcm->tcm_handle,
Patrick McHardyffc8fef2007-07-30 17:11:50 -07001175 tca, &err);
David S. Miller6ec1c692009-09-06 01:58:51 -07001176 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 if (q == NULL) {
1178 if (err == -EAGAIN)
1179 goto replay;
1180 return err;
1181 }
1182
1183graft:
Ilpo Järvinene5befbd2008-08-18 22:30:01 -07001184 err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
1185 if (err) {
1186 if (q)
1187 qdisc_destroy(q);
1188 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 }
Ilpo Järvinene5befbd2008-08-18 22:30:01 -07001190
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 return 0;
1192}
1193
1194static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
Eric W. Biederman15e47302012-09-07 20:12:54 +00001195 u32 portid, u32 seq, u16 flags, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196{
1197 struct tcmsg *tcm;
1198 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001199 unsigned char *b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 struct gnet_dump d;
Eric Dumazeta2da5702011-01-20 03:48:19 +00001201 struct qdisc_size_table *stab;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
Eric W. Biederman15e47302012-09-07 20:12:54 +00001203 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
David S. Miller02ef22c2012-06-26 21:50:05 -07001204 if (!nlh)
1205 goto out_nlmsg_trim;
1206 tcm = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 tcm->tcm_family = AF_UNSPEC;
Patrick McHardy9ef1d4c2005-06-28 12:55:30 -07001208 tcm->tcm__pad1 = 0;
1209 tcm->tcm__pad2 = 0;
David S. Miller5ce2d482008-07-08 17:06:30 -07001210 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 tcm->tcm_parent = clid;
1212 tcm->tcm_handle = q->handle;
1213 tcm->tcm_info = atomic_read(&q->refcnt);
David S. Miller1b34ec42012-03-29 05:11:39 -04001214 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1215 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 if (q->ops->dump && q->ops->dump(q, skb) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001217 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 q->qstats.qlen = q->q.qlen;
1219
Eric Dumazeta2da5702011-01-20 03:48:19 +00001220 stab = rtnl_dereference(q->stab);
1221 if (stab && qdisc_dump_stab(skb, stab) < 0)
Jussi Kivilinna175f9c12008-07-20 00:08:47 -07001222 goto nla_put_failure;
1223
Jarek Poplawski102396a2008-08-29 14:21:52 -07001224 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1225 qdisc_root_sleeping_lock(q), &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001226 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227
1228 if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001229 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
1231 if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
Eric Dumazetd250a5f2009-10-02 10:32:18 +00001232 gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 gnet_stats_copy_queue(&d, &q->qstats) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001234 goto nla_put_failure;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001235
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 if (gnet_stats_finish_copy(&d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001237 goto nla_put_failure;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001238
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001239 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 return skb->len;
1241
David S. Miller02ef22c2012-06-26 21:50:05 -07001242out_nlmsg_trim:
Patrick McHardy1e904742008-01-22 22:11:17 -08001243nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001244 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 return -1;
1246}
1247
Eric Dumazet53b0f082010-05-22 20:37:44 +00001248static bool tc_qdisc_dump_ignore(struct Qdisc *q)
1249{
1250 return (q->flags & TCQ_F_BUILTIN) ? true : false;
1251}
1252
Tom Goff7316ae82010-03-19 15:40:13 +00001253static int qdisc_notify(struct net *net, struct sk_buff *oskb,
1254 struct nlmsghdr *n, u32 clid,
1255 struct Qdisc *old, struct Qdisc *new)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256{
1257 struct sk_buff *skb;
Eric W. Biederman15e47302012-09-07 20:12:54 +00001258 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259
1260 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1261 if (!skb)
1262 return -ENOBUFS;
1263
Eric Dumazet53b0f082010-05-22 20:37:44 +00001264 if (old && !tc_qdisc_dump_ignore(old)) {
Eric W. Biederman15e47302012-09-07 20:12:54 +00001265 if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001266 0, RTM_DELQDISC) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 goto err_out;
1268 }
Eric Dumazet53b0f082010-05-22 20:37:44 +00001269 if (new && !tc_qdisc_dump_ignore(new)) {
Eric W. Biederman15e47302012-09-07 20:12:54 +00001270 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001271 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 goto err_out;
1273 }
1274
1275 if (skb->len)
Eric W. Biederman15e47302012-09-07 20:12:54 +00001276 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001277 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278
1279err_out:
1280 kfree_skb(skb);
1281 return -EINVAL;
1282}
1283
David S. Miller30723672008-07-18 22:50:15 -07001284static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
1285 struct netlink_callback *cb,
1286 int *q_idx_p, int s_q_idx)
1287{
1288 int ret = 0, q_idx = *q_idx_p;
1289 struct Qdisc *q;
1290
1291 if (!root)
1292 return 0;
1293
1294 q = root;
1295 if (q_idx < s_q_idx) {
1296 q_idx++;
1297 } else {
1298 if (!tc_qdisc_dump_ignore(q) &&
Eric W. Biederman15e47302012-09-07 20:12:54 +00001299 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
David S. Miller30723672008-07-18 22:50:15 -07001300 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1301 goto done;
1302 q_idx++;
1303 }
1304 list_for_each_entry(q, &root->list, list) {
1305 if (q_idx < s_q_idx) {
1306 q_idx++;
1307 continue;
1308 }
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001309 if (!tc_qdisc_dump_ignore(q) &&
Eric W. Biederman15e47302012-09-07 20:12:54 +00001310 tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
David S. Miller30723672008-07-18 22:50:15 -07001311 cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0)
1312 goto done;
1313 q_idx++;
1314 }
1315
1316out:
1317 *q_idx_p = q_idx;
1318 return ret;
1319done:
1320 ret = -1;
1321 goto out;
1322}
1323
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
1325{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001326 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 int idx, q_idx;
1328 int s_idx, s_q_idx;
1329 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330
1331 s_idx = cb->args[0];
1332 s_q_idx = q_idx = cb->args[1];
stephen hemmingerf1e90162009-11-10 07:54:49 +00001333
1334 rcu_read_lock();
Pavel Emelianov7562f872007-05-03 15:13:45 -07001335 idx = 0;
Tom Goff7316ae82010-03-19 15:40:13 +00001336 for_each_netdev_rcu(net, dev) {
David S. Miller30723672008-07-18 22:50:15 -07001337 struct netdev_queue *dev_queue;
1338
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 if (idx < s_idx)
Pavel Emelianov7562f872007-05-03 15:13:45 -07001340 goto cont;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 if (idx > s_idx)
1342 s_q_idx = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 q_idx = 0;
David S. Miller30723672008-07-18 22:50:15 -07001344
Patrick McHardyaf356af2009-09-04 06:41:18 +00001345 if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001346 goto done;
1347
Eric Dumazet24824a02010-10-02 06:11:55 +00001348 dev_queue = dev_ingress_queue(dev);
1349 if (dev_queue &&
1350 tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1351 &q_idx, s_q_idx) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001352 goto done;
1353
Pavel Emelianov7562f872007-05-03 15:13:45 -07001354cont:
1355 idx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 }
1357
1358done:
stephen hemmingerf1e90162009-11-10 07:54:49 +00001359 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
1361 cb->args[0] = idx;
1362 cb->args[1] = q_idx;
1363
1364 return skb->len;
1365}
1366
1367
1368
1369/************************************************
1370 * Traffic classes manipulation. *
1371 ************************************************/
1372
1373
1374
1375static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
1376{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001377 struct net *net = sock_net(skb->sk);
David S. Miller02ef22c2012-06-26 21:50:05 -07001378 struct tcmsg *tcm = nlmsg_data(n);
Patrick McHardy1e904742008-01-22 22:11:17 -08001379 struct nlattr *tca[TCA_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 struct net_device *dev;
1381 struct Qdisc *q = NULL;
Eric Dumazet20fea082007-11-14 01:44:41 -08001382 const struct Qdisc_class_ops *cops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 unsigned long cl = 0;
1384 unsigned long new_cl;
Eric W. Biederman15e47302012-09-07 20:12:54 +00001385 u32 portid = tcm->tcm_parent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 u32 clid = tcm->tcm_handle;
1387 u32 qid = TC_H_MAJ(clid);
1388 int err;
1389
Eric W. Biedermandfc47ef2012-11-16 03:03:00 +00001390 if ((n->nlmsg_type != RTM_GETTCLASS) && !capable(CAP_NET_ADMIN))
1391 return -EPERM;
1392
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001393 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1394 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 return -ENODEV;
1396
Patrick McHardy1e904742008-01-22 22:11:17 -08001397 err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
1398 if (err < 0)
1399 return err;
1400
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 /*
1402 parent == TC_H_UNSPEC - unspecified parent.
1403 parent == TC_H_ROOT - class is root, which has no parent.
1404 parent == X:0 - parent is root class.
1405 parent == X:Y - parent is a node in hierarchy.
1406 parent == 0:Y - parent is X:Y, where X:0 is qdisc.
1407
1408 handle == 0:0 - generate handle from kernel pool.
1409 handle == 0:Y - class is X:Y, where X:0 is qdisc.
1410 handle == X:Y - clear.
1411 handle == X:0 - root class.
1412 */
1413
1414 /* Step 1. Determine qdisc handle X:0 */
1415
Eric W. Biederman15e47302012-09-07 20:12:54 +00001416 if (portid != TC_H_ROOT) {
1417 u32 qid1 = TC_H_MAJ(portid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
1419 if (qid && qid1) {
1420 /* If both majors are known, they must be identical. */
1421 if (qid != qid1)
1422 return -EINVAL;
1423 } else if (qid1) {
1424 qid = qid1;
1425 } else if (qid == 0)
Patrick McHardyaf356af2009-09-04 06:41:18 +00001426 qid = dev->qdisc->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427
1428 /* Now qid is genuine qdisc handle consistent
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001429 * both with parent and child.
1430 *
Eric W. Biederman15e47302012-09-07 20:12:54 +00001431 * TC_H_MAJ(portid) still may be unspecified, complete it now.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 */
Eric W. Biederman15e47302012-09-07 20:12:54 +00001433 if (portid)
1434 portid = TC_H_MAKE(qid, portid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 } else {
1436 if (qid == 0)
Patrick McHardyaf356af2009-09-04 06:41:18 +00001437 qid = dev->qdisc->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 }
1439
1440 /* OK. Locate qdisc */
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001441 q = qdisc_lookup(dev, qid);
1442 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 return -ENOENT;
1444
1445 /* An check that it supports classes */
1446 cops = q->ops->cl_ops;
1447 if (cops == NULL)
1448 return -EINVAL;
1449
1450 /* Now try to get class */
1451 if (clid == 0) {
Eric W. Biederman15e47302012-09-07 20:12:54 +00001452 if (portid == TC_H_ROOT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 clid = qid;
1454 } else
1455 clid = TC_H_MAKE(qid, clid);
1456
1457 if (clid)
1458 cl = cops->get(q, clid);
1459
1460 if (cl == 0) {
1461 err = -ENOENT;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001462 if (n->nlmsg_type != RTM_NEWTCLASS ||
1463 !(n->nlmsg_flags & NLM_F_CREATE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 goto out;
1465 } else {
1466 switch (n->nlmsg_type) {
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001467 case RTM_NEWTCLASS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 err = -EEXIST;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001469 if (n->nlmsg_flags & NLM_F_EXCL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 goto out;
1471 break;
1472 case RTM_DELTCLASS:
Patrick McHardyde6d5cd2009-09-04 06:41:16 +00001473 err = -EOPNOTSUPP;
1474 if (cops->delete)
1475 err = cops->delete(q, cl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 if (err == 0)
Tom Goff7316ae82010-03-19 15:40:13 +00001477 tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 goto out;
1479 case RTM_GETTCLASS:
Tom Goff7316ae82010-03-19 15:40:13 +00001480 err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 goto out;
1482 default:
1483 err = -EINVAL;
1484 goto out;
1485 }
1486 }
1487
1488 new_cl = cl;
Patrick McHardyde6d5cd2009-09-04 06:41:16 +00001489 err = -EOPNOTSUPP;
1490 if (cops->change)
Eric W. Biederman15e47302012-09-07 20:12:54 +00001491 err = cops->change(q, clid, portid, tca, &new_cl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 if (err == 0)
Tom Goff7316ae82010-03-19 15:40:13 +00001493 tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494
1495out:
1496 if (cl)
1497 cops->put(q, cl);
1498
1499 return err;
1500}
1501
1502
1503static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
1504 unsigned long cl,
Eric W. Biederman15e47302012-09-07 20:12:54 +00001505 u32 portid, u32 seq, u16 flags, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506{
1507 struct tcmsg *tcm;
1508 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001509 unsigned char *b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 struct gnet_dump d;
Eric Dumazet20fea082007-11-14 01:44:41 -08001511 const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512
Eric W. Biederman15e47302012-09-07 20:12:54 +00001513 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
David S. Miller02ef22c2012-06-26 21:50:05 -07001514 if (!nlh)
1515 goto out_nlmsg_trim;
1516 tcm = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 tcm->tcm_family = AF_UNSPEC;
Eric Dumazet16ebb5e2009-09-02 02:40:09 +00001518 tcm->tcm__pad1 = 0;
1519 tcm->tcm__pad2 = 0;
David S. Miller5ce2d482008-07-08 17:06:30 -07001520 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 tcm->tcm_parent = q->handle;
1522 tcm->tcm_handle = q->handle;
1523 tcm->tcm_info = 0;
David S. Miller1b34ec42012-03-29 05:11:39 -04001524 if (nla_put_string(skb, TCA_KIND, q->ops->id))
1525 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001527 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528
Jarek Poplawski102396a2008-08-29 14:21:52 -07001529 if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1530 qdisc_root_sleeping_lock(q), &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001531 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532
1533 if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001534 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535
1536 if (gnet_stats_finish_copy(&d) < 0)
Patrick McHardy1e904742008-01-22 22:11:17 -08001537 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001539 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 return skb->len;
1541
David S. Miller02ef22c2012-06-26 21:50:05 -07001542out_nlmsg_trim:
Patrick McHardy1e904742008-01-22 22:11:17 -08001543nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001544 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 return -1;
1546}
1547
Tom Goff7316ae82010-03-19 15:40:13 +00001548static int tclass_notify(struct net *net, struct sk_buff *oskb,
1549 struct nlmsghdr *n, struct Qdisc *q,
1550 unsigned long cl, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551{
1552 struct sk_buff *skb;
Eric W. Biederman15e47302012-09-07 20:12:54 +00001553 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554
1555 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1556 if (!skb)
1557 return -ENOBUFS;
1558
Eric W. Biederman15e47302012-09-07 20:12:54 +00001559 if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 kfree_skb(skb);
1561 return -EINVAL;
1562 }
1563
Eric W. Biederman15e47302012-09-07 20:12:54 +00001564 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001565 n->nlmsg_flags & NLM_F_ECHO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566}
1567
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001568struct qdisc_dump_args {
1569 struct qdisc_walker w;
1570 struct sk_buff *skb;
1571 struct netlink_callback *cb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572};
1573
1574static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg)
1575{
1576 struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
1577
Eric W. Biederman15e47302012-09-07 20:12:54 +00001578 return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS);
1580}
1581
David S. Miller30723672008-07-18 22:50:15 -07001582static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
1583 struct tcmsg *tcm, struct netlink_callback *cb,
1584 int *t_p, int s_t)
1585{
1586 struct qdisc_dump_args arg;
1587
1588 if (tc_qdisc_dump_ignore(q) ||
1589 *t_p < s_t || !q->ops->cl_ops ||
1590 (tcm->tcm_parent &&
1591 TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
1592 (*t_p)++;
1593 return 0;
1594 }
1595 if (*t_p > s_t)
1596 memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
1597 arg.w.fn = qdisc_class_dump;
1598 arg.skb = skb;
1599 arg.cb = cb;
1600 arg.w.stop = 0;
1601 arg.w.skip = cb->args[1];
1602 arg.w.count = 0;
1603 q->ops->cl_ops->walk(q, &arg.w);
1604 cb->args[1] = arg.w.count;
1605 if (arg.w.stop)
1606 return -1;
1607 (*t_p)++;
1608 return 0;
1609}
1610
1611static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
1612 struct tcmsg *tcm, struct netlink_callback *cb,
1613 int *t_p, int s_t)
1614{
1615 struct Qdisc *q;
1616
1617 if (!root)
1618 return 0;
1619
1620 if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
1621 return -1;
1622
1623 list_for_each_entry(q, &root->list, list) {
1624 if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
1625 return -1;
1626 }
1627
1628 return 0;
1629}
1630
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
1632{
David S. Miller02ef22c2012-06-26 21:50:05 -07001633 struct tcmsg *tcm = nlmsg_data(cb->nlh);
David S. Miller30723672008-07-18 22:50:15 -07001634 struct net *net = sock_net(skb->sk);
1635 struct netdev_queue *dev_queue;
1636 struct net_device *dev;
1637 int t, s_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638
1639 if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
1640 return 0;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001641 dev = dev_get_by_index(net, tcm->tcm_ifindex);
1642 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 return 0;
1644
1645 s_t = cb->args[0];
1646 t = 0;
1647
Patrick McHardyaf356af2009-09-04 06:41:18 +00001648 if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001649 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650
Eric Dumazet24824a02010-10-02 06:11:55 +00001651 dev_queue = dev_ingress_queue(dev);
1652 if (dev_queue &&
1653 tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
1654 &t, s_t) < 0)
David S. Miller30723672008-07-18 22:50:15 -07001655 goto done;
1656
1657done:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 cb->args[0] = t;
1659
1660 dev_put(dev);
1661 return skb->len;
1662}
1663
1664/* Main classifier routine: scans classifier chain attached
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001665 * to this qdisc, (optionally) tests for protocol and asks
1666 * specific classifiers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 */
Eric Dumazetdc7f9f62011-07-05 23:25:42 +00001668int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
Patrick McHardy73ca4912007-07-15 00:02:31 -07001669 struct tcf_result *res)
1670{
1671 __be16 protocol = skb->protocol;
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001672 int err;
Patrick McHardy73ca4912007-07-15 00:02:31 -07001673
1674 for (; tp; tp = tp->next) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001675 if (tp->protocol != protocol &&
1676 tp->protocol != htons(ETH_P_ALL))
1677 continue;
1678 err = tp->classify(skb, tp, res);
1679
1680 if (err >= 0) {
Patrick McHardy73ca4912007-07-15 00:02:31 -07001681#ifdef CONFIG_NET_CLS_ACT
1682 if (err != TC_ACT_RECLASSIFY && skb->tc_verd)
1683 skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0);
1684#endif
1685 return err;
1686 }
1687 }
1688 return -1;
1689}
1690EXPORT_SYMBOL(tc_classify_compat);
1691
Eric Dumazetdc7f9f62011-07-05 23:25:42 +00001692int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
Patrick McHardy73ca4912007-07-15 00:02:31 -07001693 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694{
1695 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696#ifdef CONFIG_NET_CLS_ACT
Eric Dumazetdc7f9f62011-07-05 23:25:42 +00001697 const struct tcf_proto *otp = tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698reclassify:
Hagen Paul Pfeifer52bc9742011-02-25 05:45:21 +00001699#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700
Patrick McHardy73ca4912007-07-15 00:02:31 -07001701 err = tc_classify_compat(skb, tp, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702#ifdef CONFIG_NET_CLS_ACT
Patrick McHardy73ca4912007-07-15 00:02:31 -07001703 if (err == TC_ACT_RECLASSIFY) {
1704 u32 verd = G_TC_VERD(skb->tc_verd);
1705 tp = otp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706
Patrick McHardy73ca4912007-07-15 00:02:31 -07001707 if (verd++ >= MAX_REC_LOOP) {
Joe Perchese87cc472012-05-13 21:56:26 +00001708 net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n",
1709 tp->q->ops->id,
1710 tp->prio & 0xffff,
1711 ntohs(tp->protocol));
Patrick McHardy73ca4912007-07-15 00:02:31 -07001712 return TC_ACT_SHOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 }
Patrick McHardy73ca4912007-07-15 00:02:31 -07001714 skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd);
1715 goto reclassify;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 }
Patrick McHardy73ca4912007-07-15 00:02:31 -07001717#endif
1718 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719}
Patrick McHardy73ca4912007-07-15 00:02:31 -07001720EXPORT_SYMBOL(tc_classify);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721
Patrick McHardya48b5a62007-03-23 11:29:43 -07001722void tcf_destroy(struct tcf_proto *tp)
1723{
1724 tp->ops->destroy(tp);
1725 module_put(tp->ops->owner);
1726 kfree(tp);
1727}
1728
Patrick McHardyff31ab52008-07-01 19:52:38 -07001729void tcf_destroy_chain(struct tcf_proto **fl)
Patrick McHardya48b5a62007-03-23 11:29:43 -07001730{
1731 struct tcf_proto *tp;
1732
Patrick McHardyff31ab52008-07-01 19:52:38 -07001733 while ((tp = *fl) != NULL) {
1734 *fl = tp->next;
Patrick McHardya48b5a62007-03-23 11:29:43 -07001735 tcf_destroy(tp);
1736 }
1737}
1738EXPORT_SYMBOL(tcf_destroy_chain);
1739
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740#ifdef CONFIG_PROC_FS
1741static int psched_show(struct seq_file *seq, void *v)
1742{
Patrick McHardy3c0cfc12007-10-10 16:32:41 -07001743 struct timespec ts;
1744
1745 hrtimer_get_res(CLOCK_MONOTONIC, &ts);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 seq_printf(seq, "%08x %08x %08x %08x\n",
Jarek Poplawskica44d6e2009-06-15 02:31:47 -07001747 (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
Patrick McHardy514bca32007-03-16 12:34:52 -07001748 1000000,
Patrick McHardy3c0cfc12007-10-10 16:32:41 -07001749 (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750
1751 return 0;
1752}
1753
1754static int psched_open(struct inode *inode, struct file *file)
1755{
Tom Goff7e5ab152010-03-30 19:44:56 -07001756 return single_open(file, psched_show, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757}
1758
Arjan van de Venda7071d2007-02-12 00:55:36 -08001759static const struct file_operations psched_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760 .owner = THIS_MODULE,
1761 .open = psched_open,
1762 .read = seq_read,
1763 .llseek = seq_lseek,
1764 .release = single_release,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +09001765};
Tom Goff7316ae82010-03-19 15:40:13 +00001766
1767static int __net_init psched_net_init(struct net *net)
1768{
1769 struct proc_dir_entry *e;
1770
1771 e = proc_net_fops_create(net, "psched", 0, &psched_fops);
1772 if (e == NULL)
1773 return -ENOMEM;
1774
1775 return 0;
1776}
1777
1778static void __net_exit psched_net_exit(struct net *net)
1779{
1780 proc_net_remove(net, "psched");
Tom Goff7316ae82010-03-19 15:40:13 +00001781}
1782#else
1783static int __net_init psched_net_init(struct net *net)
1784{
1785 return 0;
1786}
1787
1788static void __net_exit psched_net_exit(struct net *net)
1789{
1790}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791#endif
1792
Tom Goff7316ae82010-03-19 15:40:13 +00001793static struct pernet_operations psched_net_ops = {
1794 .init = psched_net_init,
1795 .exit = psched_net_exit,
1796};
1797
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798static int __init pktsched_init(void)
1799{
Tom Goff7316ae82010-03-19 15:40:13 +00001800 int err;
1801
1802 err = register_pernet_subsys(&psched_net_ops);
1803 if (err) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +00001804 pr_err("pktsched_init: "
Tom Goff7316ae82010-03-19 15:40:13 +00001805 "cannot initialize per netns operations\n");
1806 return err;
1807 }
1808
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 register_qdisc(&pfifo_qdisc_ops);
1810 register_qdisc(&bfifo_qdisc_ops);
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +00001811 register_qdisc(&pfifo_head_drop_qdisc_ops);
David S. Miller6ec1c692009-09-06 01:58:51 -07001812 register_qdisc(&mq_qdisc_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813
Greg Rosec7ac8672011-06-10 01:27:09 +00001814 rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
1815 rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
1816 rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL);
1817 rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
1818 rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
1819 rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL);
Thomas Grafbe577dd2007-03-22 11:55:50 -07001820
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 return 0;
1822}
1823
1824subsys_initcall(pktsched_init);