Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_api.c Packet scheduler API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Fixes: | |
12 | * | |
13 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. | |
14 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
15 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
1da177e4 | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/errno.h> |
1da177e4 | 23 | #include <linux/skbuff.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/proc_fs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/list.h> | |
4179477f | 29 | #include <linux/hrtimer.h> |
25bfcd5a | 30 | #include <linux/lockdep.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
1da177e4 | 32 | |
457c4cbc | 33 | #include <net/net_namespace.h> |
b854272b | 34 | #include <net/sock.h> |
dc5fc579 | 35 | #include <net/netlink.h> |
1da177e4 LT |
36 | #include <net/pkt_sched.h> |
37 | ||
7316ae88 TG |
38 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
39 | struct nlmsghdr *n, u32 clid, | |
1da177e4 | 40 | struct Qdisc *old, struct Qdisc *new); |
7316ae88 TG |
41 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
42 | struct nlmsghdr *n, struct Qdisc *q, | |
43 | unsigned long cl, int event); | |
1da177e4 LT |
44 | |
45 | /* | |
46 | ||
47 | Short review. | |
48 | ------------- | |
49 | ||
50 | This file consists of two interrelated parts: | |
51 | ||
52 | 1. queueing disciplines manager frontend. | |
53 | 2. traffic classes manager frontend. | |
54 | ||
55 | Generally, queueing discipline ("qdisc") is a black box, | |
56 | which is able to enqueue packets and to dequeue them (when | |
57 | device is ready to send something) in order and at times | |
58 | determined by algorithm hidden in it. | |
59 | ||
60 | qdisc's are divided to two categories: | |
61 | - "queues", which have no internal structure visible from outside. | |
62 | - "schedulers", which split all the packets to "traffic classes", | |
63 | using "packet classifiers" (look at cls_api.c) | |
64 | ||
65 | In turn, classes may have child qdiscs (as rule, queues) | |
66 | attached to them etc. etc. etc. | |
67 | ||
68 | The goal of the routines in this file is to translate | |
69 | information supplied by user in the form of handles | |
70 | to more intelligible for kernel form, to make some sanity | |
71 | checks and part of work, which is common to all qdiscs | |
72 | and to provide rtnetlink notifications. | |
73 | ||
74 | All real intelligent work is done inside qdisc modules. | |
75 | ||
76 | ||
77 | ||
78 | Every discipline has two major routines: enqueue and dequeue. | |
79 | ||
80 | ---dequeue | |
81 | ||
82 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
83 | but it does not mean that queue is empty, it just means that | |
84 | discipline does not want to send anything this time. | |
85 | Queue is really empty if q->q.qlen == 0. | |
86 | For complicated disciplines with multiple queues q->q is not | |
87 | real packet queue, but however q->q.qlen must be valid. | |
88 | ||
89 | ---enqueue | |
90 | ||
91 | enqueue returns 0, if packet was enqueued successfully. | |
92 | If packet (this one or another one) was dropped, it returns | |
93 | not zero error code. | |
94 | NET_XMIT_DROP - this packet dropped | |
95 | Expected action: do not backoff, but wait until queue will clear. | |
96 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
97 | Expected action: backoff or ignore | |
98 | NET_XMIT_POLICED - dropped by police. | |
99 | Expected action: backoff or error to real-time apps. | |
100 | ||
101 | Auxiliary routines: | |
102 | ||
99c0db26 JP |
103 | ---peek |
104 | ||
105 | like dequeue but without removing a packet from the queue | |
106 | ||
1da177e4 LT |
107 | ---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. */ | |
126 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
127 | ||
128 | ||
129 | /************************************************ | |
130 | * Queueing disciplines manipulation. * | |
131 | ************************************************/ | |
132 | ||
133 | ||
134 | /* The list of all installed queueing disciplines. */ | |
135 | ||
136 | static struct Qdisc_ops *qdisc_base; | |
137 | ||
138 | /* Register/uregister queueing discipline */ | |
139 | ||
140 | int 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; | |
99c0db26 | 152 | if (qops->peek == NULL) { |
68fd26b5 | 153 | if (qops->dequeue == NULL) |
99c0db26 | 154 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
155 | else |
156 | goto out_einval; | |
99c0db26 | 157 | } |
1da177e4 LT |
158 | if (qops->dequeue == NULL) |
159 | qops->dequeue = noop_qdisc_ops.dequeue; | |
160 | ||
68fd26b5 JP |
161 | if (qops->cl_ops) { |
162 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
163 | ||
3e9e5a59 | 164 | if (!(cops->get && cops->put && cops->walk && cops->leaf)) |
68fd26b5 JP |
165 | goto out_einval; |
166 | ||
167 | if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf)) | |
168 | goto out_einval; | |
169 | } | |
170 | ||
1da177e4 LT |
171 | qops->next = NULL; |
172 | *qp = qops; | |
173 | rc = 0; | |
174 | out: | |
175 | write_unlock(&qdisc_mod_lock); | |
176 | return rc; | |
68fd26b5 JP |
177 | |
178 | out_einval: | |
179 | rc = -EINVAL; | |
180 | goto out; | |
1da177e4 | 181 | } |
62e3ba1b | 182 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
183 | |
184 | int unregister_qdisc(struct Qdisc_ops *qops) | |
185 | { | |
186 | struct Qdisc_ops *q, **qp; | |
187 | int err = -ENOENT; | |
188 | ||
189 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 190 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
191 | 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 | } | |
62e3ba1b | 201 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 LT |
202 | |
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 | ||
6113b748 | 207 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
208 | { |
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 | ||
f6e0b239 JP |
222 | static void qdisc_list_add(struct Qdisc *q) |
223 | { | |
f6486d40 | 224 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
af356afa | 225 | list_add_tail(&q->list, &qdisc_dev(q)->qdisc->list); |
f6e0b239 JP |
226 | } |
227 | ||
228 | void qdisc_list_del(struct Qdisc *q) | |
229 | { | |
f6486d40 | 230 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
f6e0b239 | 231 | list_del(&q->list); |
f6e0b239 JP |
232 | } |
233 | EXPORT_SYMBOL(qdisc_list_del); | |
234 | ||
ead81cc5 | 235 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 236 | { |
f6e0b239 JP |
237 | struct Qdisc *q; |
238 | ||
af356afa PM |
239 | q = qdisc_match_from_root(dev->qdisc, handle); |
240 | if (q) | |
241 | goto out; | |
f6e0b239 | 242 | |
24824a09 ED |
243 | if (dev_ingress_queue(dev)) |
244 | q = qdisc_match_from_root( | |
245 | dev_ingress_queue(dev)->qdisc_sleeping, | |
246 | handle); | |
f6486d40 | 247 | out: |
f6e0b239 | 248 | return q; |
1da177e4 LT |
249 | } |
250 | ||
251 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
252 | { | |
253 | unsigned long cl; | |
254 | struct Qdisc *leaf; | |
20fea08b | 255 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
256 | |
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 | ||
1e90474c | 270 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
271 | { |
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) { | |
1e90474c | 277 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
278 | 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 | ||
288 | static struct qdisc_rate_table *qdisc_rtab_list; | |
289 | ||
1e90474c | 290 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
291 | { |
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 | ||
5feb5e1a PM |
301 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
302 | nla_len(tab) != TC_RTAB_SIZE) | |
1da177e4 LT |
303 | return NULL; |
304 | ||
305 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
306 | if (rtab) { | |
307 | rtab->rate = *r; | |
308 | rtab->refcnt = 1; | |
1e90474c | 309 | memcpy(rtab->data, nla_data(tab), 1024); |
1da177e4 LT |
310 | rtab->next = qdisc_rtab_list; |
311 | qdisc_rtab_list = rtab; | |
312 | } | |
313 | return rtab; | |
314 | } | |
62e3ba1b | 315 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
316 | |
317 | void 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 | ||
cc7ec456 ED |
324 | for (rtabp = &qdisc_rtab_list; |
325 | (rtab = *rtabp) != NULL; | |
326 | rtabp = &rtab->next) { | |
1da177e4 LT |
327 | if (rtab == tab) { |
328 | *rtabp = rtab->next; | |
329 | kfree(rtab); | |
330 | return; | |
331 | } | |
332 | } | |
333 | } | |
62e3ba1b | 334 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 335 | |
175f9c1b JK |
336 | static LIST_HEAD(qdisc_stab_list); |
337 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
338 | ||
339 | static 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 | ||
344 | static 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 | ||
00093fab | 368 | if (tsize != s->tsize || (!tab && tsize > 0)) |
175f9c1b JK |
369 | return ERR_PTR(-EINVAL); |
370 | ||
f3b9605d | 371 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
372 | |
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++; | |
f3b9605d | 379 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
380 | return stab; |
381 | } | |
382 | ||
f3b9605d | 383 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
384 | |
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 | ||
f3b9605d | 394 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 395 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 396 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
397 | |
398 | return stab; | |
399 | } | |
400 | ||
a2da570d ED |
401 | static void stab_kfree_rcu(struct rcu_head *head) |
402 | { | |
403 | kfree(container_of(head, struct qdisc_size_table, rcu)); | |
404 | } | |
405 | ||
175f9c1b JK |
406 | void qdisc_put_stab(struct qdisc_size_table *tab) |
407 | { | |
408 | if (!tab) | |
409 | return; | |
410 | ||
f3b9605d | 411 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
412 | |
413 | if (--tab->refcnt == 0) { | |
414 | list_del(&tab->list); | |
a2da570d | 415 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
175f9c1b JK |
416 | } |
417 | ||
f3b9605d | 418 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
419 | } |
420 | EXPORT_SYMBOL(qdisc_put_stab); | |
421 | ||
422 | static 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); | |
3aa4614d PM |
427 | if (nest == NULL) |
428 | goto nla_put_failure; | |
175f9c1b JK |
429 | NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); |
430 | nla_nest_end(skb, nest); | |
431 | ||
432 | return skb->len; | |
433 | ||
434 | nla_put_failure: | |
435 | return -1; | |
436 | } | |
437 | ||
a2da570d | 438 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab) |
175f9c1b JK |
439 | { |
440 | int pkt_len, slot; | |
441 | ||
442 | pkt_len = skb->len + stab->szopts.overhead; | |
443 | if (unlikely(!stab->szopts.tsize)) | |
444 | goto out; | |
445 | ||
446 | slot = pkt_len + stab->szopts.cell_align; | |
447 | if (unlikely(slot < 0)) | |
448 | slot = 0; | |
449 | ||
450 | slot >>= stab->szopts.cell_log; | |
451 | if (likely(slot < stab->szopts.tsize)) | |
452 | pkt_len = stab->data[slot]; | |
453 | else | |
454 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
455 | (slot / stab->szopts.tsize) + | |
456 | stab->data[slot % stab->szopts.tsize]; | |
457 | ||
458 | pkt_len <<= stab->szopts.size_log; | |
459 | out: | |
460 | if (unlikely(pkt_len < 1)) | |
461 | pkt_len = 1; | |
462 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
463 | } | |
a2da570d | 464 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 465 | |
b00355db JP |
466 | void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc) |
467 | { | |
468 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
469 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
470 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
471 | qdisc->flags |= TCQ_F_WARN_NONWC; |
472 | } | |
473 | } | |
474 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
475 | ||
4179477f PM |
476 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
477 | { | |
478 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 479 | timer); |
4179477f | 480 | |
fd245a4a | 481 | qdisc_unthrottled(wd->qdisc); |
8608db03 | 482 | __netif_schedule(qdisc_root(wd->qdisc)); |
1936502d | 483 | |
4179477f PM |
484 | return HRTIMER_NORESTART; |
485 | } | |
486 | ||
487 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
488 | { | |
2fbd3da3 DM |
489 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
490 | wd->timer.function = qdisc_watchdog; | |
4179477f PM |
491 | wd->qdisc = qdisc; |
492 | } | |
493 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
494 | ||
495 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
496 | { | |
497 | ktime_t time; | |
498 | ||
2540e051 JP |
499 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
500 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
501 | return; | |
502 | ||
fd245a4a | 503 | qdisc_throttled(wd->qdisc); |
4179477f | 504 | time = ktime_set(0, 0); |
ca44d6e6 | 505 | time = ktime_add_ns(time, PSCHED_TICKS2NS(expires)); |
2fbd3da3 | 506 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); |
4179477f PM |
507 | } |
508 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
509 | ||
510 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
511 | { | |
2fbd3da3 | 512 | hrtimer_cancel(&wd->timer); |
fd245a4a | 513 | qdisc_unthrottled(wd->qdisc); |
4179477f PM |
514 | } |
515 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 516 | |
a94f779f | 517 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
518 | { |
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 | ||
535 | static 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 | ||
545 | void 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 | } | |
579 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
580 | ||
581 | int 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 | } | |
593 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
594 | ||
595 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
596 | { | |
597 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
598 | } | |
599 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
600 | ||
601 | void 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 | } | |
611 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
612 | ||
613 | void 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 | } | |
619 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
620 | ||
1da177e4 LT |
621 | /* Allocate an unique handle from space managed by kernel */ |
622 | ||
623 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
624 | { | |
625 | int i = 0x10000; | |
626 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
627 | ||
628 | do { | |
629 | autohandle += TC_H_MAKE(0x10000U, 0); | |
630 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
631 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
632 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
633 | ||
cc7ec456 | 634 | return i > 0 ? autohandle : 0; |
1da177e4 LT |
635 | } |
636 | ||
43effa1e PM |
637 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
638 | { | |
20fea08b | 639 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
640 | unsigned long cl; |
641 | u32 parentid; | |
642 | ||
643 | if (n == 0) | |
644 | return; | |
645 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
646 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
647 | return; | |
648 | ||
5ce2d488 | 649 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
650 | if (sch == NULL) { |
651 | WARN_ON(parentid != TC_H_ROOT); | |
652 | return; | |
653 | } | |
43effa1e PM |
654 | cops = sch->ops->cl_ops; |
655 | if (cops->qlen_notify) { | |
656 | cl = cops->get(sch, parentid); | |
657 | cops->qlen_notify(sch, cl); | |
658 | cops->put(sch, cl); | |
659 | } | |
660 | sch->q.qlen -= n; | |
661 | } | |
662 | } | |
663 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 664 | |
7316ae88 TG |
665 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
666 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
667 | struct Qdisc *old, struct Qdisc *new) |
668 | { | |
669 | if (new || old) | |
7316ae88 | 670 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 671 | |
4d8863a2 | 672 | if (old) |
99194cff | 673 | qdisc_destroy(old); |
99194cff DM |
674 | } |
675 | ||
676 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
677 | * to device "dev". | |
678 | * | |
679 | * When appropriate send a netlink notification using 'skb' | |
680 | * and "n". | |
681 | * | |
682 | * On success, destroy old qdisc. | |
1da177e4 LT |
683 | */ |
684 | ||
685 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
686 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
687 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 688 | { |
99194cff | 689 | struct Qdisc *q = old; |
7316ae88 | 690 | struct net *net = dev_net(dev); |
1da177e4 | 691 | int err = 0; |
1da177e4 | 692 | |
10297b99 | 693 | if (parent == NULL) { |
99194cff DM |
694 | unsigned int i, num_q, ingress; |
695 | ||
696 | ingress = 0; | |
697 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
698 | if ((q && q->flags & TCQ_F_INGRESS) || |
699 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
700 | num_q = 1; |
701 | ingress = 1; | |
24824a09 ED |
702 | if (!dev_ingress_queue(dev)) |
703 | return -ENOENT; | |
99194cff DM |
704 | } |
705 | ||
706 | if (dev->flags & IFF_UP) | |
707 | dev_deactivate(dev); | |
708 | ||
6ec1c69a DM |
709 | if (new && new->ops->attach) { |
710 | new->ops->attach(new); | |
711 | num_q = 0; | |
712 | } | |
713 | ||
99194cff | 714 | for (i = 0; i < num_q; i++) { |
24824a09 | 715 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
716 | |
717 | if (!ingress) | |
718 | dev_queue = netdev_get_tx_queue(dev, i); | |
719 | ||
8d50b53d DM |
720 | old = dev_graft_qdisc(dev_queue, new); |
721 | if (new && i > 0) | |
722 | atomic_inc(&new->refcnt); | |
723 | ||
036d6a67 JP |
724 | if (!ingress) |
725 | qdisc_destroy(old); | |
1da177e4 | 726 | } |
99194cff | 727 | |
036d6a67 | 728 | if (!ingress) { |
7316ae88 TG |
729 | notify_and_destroy(net, skb, n, classid, |
730 | dev->qdisc, new); | |
036d6a67 JP |
731 | if (new && !new->ops->attach) |
732 | atomic_inc(&new->refcnt); | |
733 | dev->qdisc = new ? : &noop_qdisc; | |
734 | } else { | |
7316ae88 | 735 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 736 | } |
af356afa | 737 | |
99194cff DM |
738 | if (dev->flags & IFF_UP) |
739 | dev_activate(dev); | |
1da177e4 | 740 | } else { |
20fea08b | 741 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 742 | |
c9f1d038 PM |
743 | err = -EOPNOTSUPP; |
744 | if (cops && cops->graft) { | |
1da177e4 LT |
745 | unsigned long cl = cops->get(parent, classid); |
746 | if (cl) { | |
99194cff | 747 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 748 | cops->put(parent, cl); |
c9f1d038 PM |
749 | } else |
750 | err = -ENOENT; | |
1da177e4 | 751 | } |
99194cff | 752 | if (!err) |
7316ae88 | 753 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
754 | } |
755 | return err; | |
756 | } | |
757 | ||
25bfcd5a JP |
758 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
759 | static struct lock_class_key qdisc_tx_lock; | |
760 | static struct lock_class_key qdisc_rx_lock; | |
761 | ||
1da177e4 LT |
762 | /* |
763 | Allocate and initialize new qdisc. | |
764 | ||
765 | Parameters are passed via opt. | |
766 | */ | |
767 | ||
768 | static struct Qdisc * | |
bb949fbd | 769 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
23bcf634 PM |
770 | struct Qdisc *p, u32 parent, u32 handle, |
771 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
772 | { |
773 | int err; | |
1e90474c | 774 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
775 | struct Qdisc *sch; |
776 | struct Qdisc_ops *ops; | |
175f9c1b | 777 | struct qdisc_size_table *stab; |
1da177e4 LT |
778 | |
779 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 780 | #ifdef CONFIG_MODULES |
1da177e4 LT |
781 | if (ops == NULL && kind != NULL) { |
782 | char name[IFNAMSIZ]; | |
1e90474c | 783 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
784 | /* We dropped the RTNL semaphore in order to |
785 | * perform the module load. So, even if we | |
786 | * succeeded in loading the module we have to | |
787 | * tell the caller to replay the request. We | |
788 | * indicate this using -EAGAIN. | |
789 | * We replay the request because the device may | |
790 | * go away in the mean time. | |
791 | */ | |
792 | rtnl_unlock(); | |
793 | request_module("sch_%s", name); | |
794 | rtnl_lock(); | |
795 | ops = qdisc_lookup_ops(kind); | |
796 | if (ops != NULL) { | |
797 | /* We will try again qdisc_lookup_ops, | |
798 | * so don't keep a reference. | |
799 | */ | |
800 | module_put(ops->owner); | |
801 | err = -EAGAIN; | |
802 | goto err_out; | |
803 | } | |
804 | } | |
805 | } | |
806 | #endif | |
807 | ||
b9e2cc0f | 808 | err = -ENOENT; |
1da177e4 LT |
809 | if (ops == NULL) |
810 | goto err_out; | |
811 | ||
5ce2d488 | 812 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
813 | if (IS_ERR(sch)) { |
814 | err = PTR_ERR(sch); | |
1da177e4 | 815 | goto err_out2; |
3d54b82f | 816 | } |
1da177e4 | 817 | |
ffc8fefa PM |
818 | sch->parent = parent; |
819 | ||
3d54b82f | 820 | if (handle == TC_H_INGRESS) { |
1da177e4 | 821 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 822 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 823 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 824 | } else { |
fd44de7c PM |
825 | if (handle == 0) { |
826 | handle = qdisc_alloc_handle(dev); | |
827 | err = -ENOMEM; | |
828 | if (handle == 0) | |
829 | goto err_out3; | |
830 | } | |
25bfcd5a | 831 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1da177e4 LT |
832 | } |
833 | ||
3d54b82f | 834 | sch->handle = handle; |
1da177e4 | 835 | |
1e90474c | 836 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
837 | if (tca[TCA_STAB]) { |
838 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
839 | if (IS_ERR(stab)) { | |
840 | err = PTR_ERR(stab); | |
7c64b9f3 | 841 | goto err_out4; |
175f9c1b | 842 | } |
a2da570d | 843 | rcu_assign_pointer(sch->stab, stab); |
175f9c1b | 844 | } |
1e90474c | 845 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
846 | spinlock_t *root_lock; |
847 | ||
23bcf634 PM |
848 | err = -EOPNOTSUPP; |
849 | if (sch->flags & TCQ_F_MQROOT) | |
850 | goto err_out4; | |
851 | ||
f6f9b93f | 852 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
853 | !(sch->flags & TCQ_F_INGRESS) && |
854 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
f6f9b93f JP |
855 | root_lock = qdisc_root_sleeping_lock(sch); |
856 | else | |
857 | root_lock = qdisc_lock(sch); | |
858 | ||
023e09a7 | 859 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f | 860 | root_lock, tca[TCA_RATE]); |
23bcf634 PM |
861 | if (err) |
862 | goto err_out4; | |
023e09a7 | 863 | } |
f6e0b239 JP |
864 | |
865 | qdisc_list_add(sch); | |
1da177e4 | 866 | |
1da177e4 LT |
867 | return sch; |
868 | } | |
869 | err_out3: | |
870 | dev_put(dev); | |
3d54b82f | 871 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
872 | err_out2: |
873 | module_put(ops->owner); | |
874 | err_out: | |
875 | *errp = err; | |
1da177e4 | 876 | return NULL; |
23bcf634 PM |
877 | |
878 | err_out4: | |
879 | /* | |
880 | * Any broken qdiscs that would require a ops->reset() here? | |
881 | * The qdisc was never in action so it shouldn't be necessary. | |
882 | */ | |
a2da570d | 883 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
884 | if (ops->destroy) |
885 | ops->destroy(sch); | |
886 | goto err_out3; | |
1da177e4 LT |
887 | } |
888 | ||
1e90474c | 889 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 890 | { |
a2da570d | 891 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 892 | int err = 0; |
1da177e4 | 893 | |
175f9c1b | 894 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
895 | if (sch->ops->change == NULL) |
896 | return -EINVAL; | |
1e90474c | 897 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
898 | if (err) |
899 | return err; | |
900 | } | |
175f9c1b JK |
901 | |
902 | if (tca[TCA_STAB]) { | |
903 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
904 | if (IS_ERR(stab)) | |
905 | return PTR_ERR(stab); | |
906 | } | |
907 | ||
a2da570d ED |
908 | ostab = rtnl_dereference(sch->stab); |
909 | rcu_assign_pointer(sch->stab, stab); | |
910 | qdisc_put_stab(ostab); | |
175f9c1b | 911 | |
23bcf634 | 912 | if (tca[TCA_RATE]) { |
71bcb09a SH |
913 | /* NB: ignores errors from replace_estimator |
914 | because change can't be undone. */ | |
23bcf634 PM |
915 | if (sch->flags & TCQ_F_MQROOT) |
916 | goto out; | |
1da177e4 | 917 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
71bcb09a SH |
918 | qdisc_root_sleeping_lock(sch), |
919 | tca[TCA_RATE]); | |
23bcf634 PM |
920 | } |
921 | out: | |
1da177e4 LT |
922 | return 0; |
923 | } | |
924 | ||
cc7ec456 ED |
925 | struct check_loop_arg { |
926 | struct qdisc_walker w; | |
1da177e4 LT |
927 | struct Qdisc *p; |
928 | int depth; | |
929 | }; | |
930 | ||
931 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
932 | ||
933 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
934 | { | |
935 | struct check_loop_arg arg; | |
936 | ||
937 | if (q->ops->cl_ops == NULL) | |
938 | return 0; | |
939 | ||
940 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
941 | arg.w.fn = check_loop_fn; | |
942 | arg.depth = depth; | |
943 | arg.p = p; | |
944 | q->ops->cl_ops->walk(q, &arg.w); | |
945 | return arg.w.stop ? -ELOOP : 0; | |
946 | } | |
947 | ||
948 | static int | |
949 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
950 | { | |
951 | struct Qdisc *leaf; | |
20fea08b | 952 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
953 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
954 | ||
955 | leaf = cops->leaf(q, cl); | |
956 | if (leaf) { | |
957 | if (leaf == arg->p || arg->depth > 7) | |
958 | return -ELOOP; | |
959 | return check_loop(leaf, arg->p, arg->depth + 1); | |
960 | } | |
961 | return 0; | |
962 | } | |
963 | ||
964 | /* | |
965 | * Delete/get qdisc. | |
966 | */ | |
967 | ||
968 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
969 | { | |
3b1e0a65 | 970 | struct net *net = sock_net(skb->sk); |
1da177e4 | 971 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 972 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
973 | struct net_device *dev; |
974 | u32 clid = tcm->tcm_parent; | |
975 | struct Qdisc *q = NULL; | |
976 | struct Qdisc *p = NULL; | |
977 | int err; | |
978 | ||
cc7ec456 ED |
979 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
980 | if (!dev) | |
1da177e4 LT |
981 | return -ENODEV; |
982 | ||
1e90474c PM |
983 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
984 | if (err < 0) | |
985 | return err; | |
986 | ||
1da177e4 LT |
987 | if (clid) { |
988 | if (clid != TC_H_ROOT) { | |
989 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 ED |
990 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
991 | if (!p) | |
1da177e4 LT |
992 | return -ENOENT; |
993 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
994 | } else if (dev_ingress_queue(dev)) { |
995 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 996 | } |
1da177e4 | 997 | } else { |
af356afa | 998 | q = dev->qdisc; |
1da177e4 LT |
999 | } |
1000 | if (!q) | |
1001 | return -ENOENT; | |
1002 | ||
1003 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
1004 | return -EINVAL; | |
1005 | } else { | |
cc7ec456 ED |
1006 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1007 | if (!q) | |
1da177e4 LT |
1008 | return -ENOENT; |
1009 | } | |
1010 | ||
1e90474c | 1011 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1012 | return -EINVAL; |
1013 | ||
1014 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1015 | if (!clid) | |
1016 | return -EINVAL; | |
1017 | if (q->handle == 0) | |
1018 | return -ENOENT; | |
cc7ec456 ED |
1019 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
1020 | if (err != 0) | |
1da177e4 | 1021 | return err; |
1da177e4 | 1022 | } else { |
7316ae88 | 1023 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1024 | } |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | /* | |
cc7ec456 | 1029 | * Create/change qdisc. |
1da177e4 LT |
1030 | */ |
1031 | ||
1032 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1033 | { | |
3b1e0a65 | 1034 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1035 | struct tcmsg *tcm; |
1e90474c | 1036 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1037 | struct net_device *dev; |
1038 | u32 clid; | |
1039 | struct Qdisc *q, *p; | |
1040 | int err; | |
1041 | ||
1042 | replay: | |
1043 | /* Reinit, just in case something touches this. */ | |
1044 | tcm = NLMSG_DATA(n); | |
1da177e4 LT |
1045 | clid = tcm->tcm_parent; |
1046 | q = p = NULL; | |
1047 | ||
cc7ec456 ED |
1048 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1049 | if (!dev) | |
1da177e4 LT |
1050 | return -ENODEV; |
1051 | ||
1e90474c PM |
1052 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1053 | if (err < 0) | |
1054 | return err; | |
1055 | ||
1da177e4 LT |
1056 | if (clid) { |
1057 | if (clid != TC_H_ROOT) { | |
1058 | if (clid != TC_H_INGRESS) { | |
cc7ec456 ED |
1059 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1060 | if (!p) | |
1da177e4 LT |
1061 | return -ENOENT; |
1062 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1063 | } else if (dev_ingress_queue_create(dev)) { |
1064 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1065 | } |
1066 | } else { | |
af356afa | 1067 | q = dev->qdisc; |
1da177e4 LT |
1068 | } |
1069 | ||
1070 | /* It may be default qdisc, ignore it */ | |
1071 | if (q && q->handle == 0) | |
1072 | q = NULL; | |
1073 | ||
1074 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1075 | if (tcm->tcm_handle) { | |
cc7ec456 | 1076 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
1da177e4 LT |
1077 | return -EEXIST; |
1078 | if (TC_H_MIN(tcm->tcm_handle)) | |
1079 | return -EINVAL; | |
cc7ec456 ED |
1080 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1081 | if (!q) | |
1da177e4 | 1082 | goto create_n_graft; |
cc7ec456 | 1083 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1084 | return -EEXIST; |
1e90474c | 1085 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1086 | return -EINVAL; |
1087 | if (q == p || | |
1088 | (p && check_loop(q, p, 0))) | |
1089 | return -ELOOP; | |
1090 | atomic_inc(&q->refcnt); | |
1091 | goto graft; | |
1092 | } else { | |
cc7ec456 | 1093 | if (!q) |
1da177e4 LT |
1094 | goto create_n_graft; |
1095 | ||
1096 | /* This magic test requires explanation. | |
1097 | * | |
1098 | * We know, that some child q is already | |
1099 | * attached to this parent and have choice: | |
1100 | * either to change it or to create/graft new one. | |
1101 | * | |
1102 | * 1. We are allowed to create/graft only | |
1103 | * if CREATE and REPLACE flags are set. | |
1104 | * | |
1105 | * 2. If EXCL is set, requestor wanted to say, | |
1106 | * that qdisc tcm_handle is not expected | |
1107 | * to exist, so that we choose create/graft too. | |
1108 | * | |
1109 | * 3. The last case is when no flags are set. | |
1110 | * Alas, it is sort of hole in API, we | |
1111 | * cannot decide what to do unambiguously. | |
1112 | * For now we select create/graft, if | |
1113 | * user gave KIND, which does not match existing. | |
1114 | */ | |
cc7ec456 ED |
1115 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1116 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1117 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1118 | (tca[TCA_KIND] && |
1119 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1120 | goto create_n_graft; |
1121 | } | |
1122 | } | |
1123 | } else { | |
1124 | if (!tcm->tcm_handle) | |
1125 | return -EINVAL; | |
1126 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1127 | } | |
1128 | ||
1129 | /* Change qdisc parameters */ | |
1130 | if (q == NULL) | |
1131 | return -ENOENT; | |
cc7ec456 | 1132 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1133 | return -EEXIST; |
1e90474c | 1134 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1135 | return -EINVAL; |
1136 | err = qdisc_change(q, tca); | |
1137 | if (err == 0) | |
7316ae88 | 1138 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1139 | return err; |
1140 | ||
1141 | create_n_graft: | |
cc7ec456 | 1142 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
1da177e4 | 1143 | return -ENOENT; |
24824a09 ED |
1144 | if (clid == TC_H_INGRESS) { |
1145 | if (dev_ingress_queue(dev)) | |
1146 | q = qdisc_create(dev, dev_ingress_queue(dev), p, | |
1147 | tcm->tcm_parent, tcm->tcm_parent, | |
1148 | tca, &err); | |
1149 | else | |
1150 | err = -ENOENT; | |
1151 | } else { | |
926e61b7 | 1152 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1153 | |
1154 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1155 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1156 | else if (p) | |
1157 | dev_queue = p->dev_queue; | |
1158 | else | |
1159 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1160 | |
926e61b7 | 1161 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1162 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1163 | tca, &err); |
6ec1c69a | 1164 | } |
1da177e4 LT |
1165 | if (q == NULL) { |
1166 | if (err == -EAGAIN) | |
1167 | goto replay; | |
1168 | return err; | |
1169 | } | |
1170 | ||
1171 | graft: | |
e5befbd9 IJ |
1172 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1173 | if (err) { | |
1174 | if (q) | |
1175 | qdisc_destroy(q); | |
1176 | return err; | |
1da177e4 | 1177 | } |
e5befbd9 | 1178 | |
1da177e4 LT |
1179 | return 0; |
1180 | } | |
1181 | ||
1182 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 1183 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1184 | { |
1185 | struct tcmsg *tcm; | |
1186 | struct nlmsghdr *nlh; | |
27a884dc | 1187 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1188 | struct gnet_dump d; |
a2da570d | 1189 | struct qdisc_size_table *stab; |
1da177e4 | 1190 | |
e431b8c0 | 1191 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1192 | tcm = NLMSG_DATA(nlh); |
1193 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1194 | tcm->tcm__pad1 = 0; |
1195 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1196 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1197 | tcm->tcm_parent = clid; |
1198 | tcm->tcm_handle = q->handle; | |
1199 | tcm->tcm_info = atomic_read(&q->refcnt); | |
57e1c487 | 1200 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1201 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1202 | goto nla_put_failure; |
1da177e4 LT |
1203 | q->qstats.qlen = q->q.qlen; |
1204 | ||
a2da570d ED |
1205 | stab = rtnl_dereference(q->stab); |
1206 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
175f9c1b JK |
1207 | goto nla_put_failure; |
1208 | ||
102396ae JP |
1209 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1210 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1211 | goto nla_put_failure; |
1da177e4 LT |
1212 | |
1213 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1214 | goto nla_put_failure; |
1da177e4 LT |
1215 | |
1216 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
d250a5f9 | 1217 | gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || |
1da177e4 | 1218 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1219 | goto nla_put_failure; |
10297b99 | 1220 | |
1da177e4 | 1221 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1222 | goto nla_put_failure; |
10297b99 | 1223 | |
27a884dc | 1224 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1225 | return skb->len; |
1226 | ||
1227 | nlmsg_failure: | |
1e90474c | 1228 | nla_put_failure: |
dc5fc579 | 1229 | nlmsg_trim(skb, b); |
1da177e4 LT |
1230 | return -1; |
1231 | } | |
1232 | ||
53b0f080 ED |
1233 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1234 | { | |
1235 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1236 | } | |
1237 | ||
7316ae88 TG |
1238 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1239 | struct nlmsghdr *n, u32 clid, | |
1240 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1241 | { |
1242 | struct sk_buff *skb; | |
1243 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1244 | ||
1245 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1246 | if (!skb) | |
1247 | return -ENOBUFS; | |
1248 | ||
53b0f080 | 1249 | if (old && !tc_qdisc_dump_ignore(old)) { |
cc7ec456 ED |
1250 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, |
1251 | 0, RTM_DELQDISC) < 0) | |
1da177e4 LT |
1252 | goto err_out; |
1253 | } | |
53b0f080 | 1254 | if (new && !tc_qdisc_dump_ignore(new)) { |
cc7ec456 ED |
1255 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, |
1256 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
1da177e4 LT |
1257 | goto err_out; |
1258 | } | |
1259 | ||
1260 | if (skb->len) | |
cc7ec456 ED |
1261 | return rtnetlink_send(skb, net, pid, RTNLGRP_TC, |
1262 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
1263 | |
1264 | err_out: | |
1265 | kfree_skb(skb); | |
1266 | return -EINVAL; | |
1267 | } | |
1268 | ||
30723673 DM |
1269 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1270 | struct netlink_callback *cb, | |
1271 | int *q_idx_p, int s_q_idx) | |
1272 | { | |
1273 | int ret = 0, q_idx = *q_idx_p; | |
1274 | struct Qdisc *q; | |
1275 | ||
1276 | if (!root) | |
1277 | return 0; | |
1278 | ||
1279 | q = root; | |
1280 | if (q_idx < s_q_idx) { | |
1281 | q_idx++; | |
1282 | } else { | |
1283 | if (!tc_qdisc_dump_ignore(q) && | |
1284 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1285 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1286 | goto done; | |
1287 | q_idx++; | |
1288 | } | |
1289 | list_for_each_entry(q, &root->list, list) { | |
1290 | if (q_idx < s_q_idx) { | |
1291 | q_idx++; | |
1292 | continue; | |
1293 | } | |
cc7ec456 | 1294 | if (!tc_qdisc_dump_ignore(q) && |
30723673 DM |
1295 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, |
1296 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1297 | goto done; | |
1298 | q_idx++; | |
1299 | } | |
1300 | ||
1301 | out: | |
1302 | *q_idx_p = q_idx; | |
1303 | return ret; | |
1304 | done: | |
1305 | ret = -1; | |
1306 | goto out; | |
1307 | } | |
1308 | ||
1da177e4 LT |
1309 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1310 | { | |
3b1e0a65 | 1311 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1312 | int idx, q_idx; |
1313 | int s_idx, s_q_idx; | |
1314 | struct net_device *dev; | |
1da177e4 LT |
1315 | |
1316 | s_idx = cb->args[0]; | |
1317 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1318 | |
1319 | rcu_read_lock(); | |
7562f876 | 1320 | idx = 0; |
7316ae88 | 1321 | for_each_netdev_rcu(net, dev) { |
30723673 DM |
1322 | struct netdev_queue *dev_queue; |
1323 | ||
1da177e4 | 1324 | if (idx < s_idx) |
7562f876 | 1325 | goto cont; |
1da177e4 LT |
1326 | if (idx > s_idx) |
1327 | s_q_idx = 0; | |
1da177e4 | 1328 | q_idx = 0; |
30723673 | 1329 | |
af356afa | 1330 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1331 | goto done; |
1332 | ||
24824a09 ED |
1333 | dev_queue = dev_ingress_queue(dev); |
1334 | if (dev_queue && | |
1335 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
1336 | &q_idx, s_q_idx) < 0) | |
30723673 DM |
1337 | goto done; |
1338 | ||
7562f876 PE |
1339 | cont: |
1340 | idx++; | |
1da177e4 LT |
1341 | } |
1342 | ||
1343 | done: | |
f1e9016d | 1344 | rcu_read_unlock(); |
1da177e4 LT |
1345 | |
1346 | cb->args[0] = idx; | |
1347 | cb->args[1] = q_idx; | |
1348 | ||
1349 | return skb->len; | |
1350 | } | |
1351 | ||
1352 | ||
1353 | ||
1354 | /************************************************ | |
1355 | * Traffic classes manipulation. * | |
1356 | ************************************************/ | |
1357 | ||
1358 | ||
1359 | ||
1360 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1361 | { | |
3b1e0a65 | 1362 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1363 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 1364 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1365 | struct net_device *dev; |
1366 | struct Qdisc *q = NULL; | |
20fea08b | 1367 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1368 | unsigned long cl = 0; |
1369 | unsigned long new_cl; | |
1370 | u32 pid = tcm->tcm_parent; | |
1371 | u32 clid = tcm->tcm_handle; | |
1372 | u32 qid = TC_H_MAJ(clid); | |
1373 | int err; | |
1374 | ||
cc7ec456 ED |
1375 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1376 | if (!dev) | |
1da177e4 LT |
1377 | return -ENODEV; |
1378 | ||
1e90474c PM |
1379 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1380 | if (err < 0) | |
1381 | return err; | |
1382 | ||
1da177e4 LT |
1383 | /* |
1384 | parent == TC_H_UNSPEC - unspecified parent. | |
1385 | parent == TC_H_ROOT - class is root, which has no parent. | |
1386 | parent == X:0 - parent is root class. | |
1387 | parent == X:Y - parent is a node in hierarchy. | |
1388 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1389 | ||
1390 | handle == 0:0 - generate handle from kernel pool. | |
1391 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1392 | handle == X:Y - clear. | |
1393 | handle == X:0 - root class. | |
1394 | */ | |
1395 | ||
1396 | /* Step 1. Determine qdisc handle X:0 */ | |
1397 | ||
1398 | if (pid != TC_H_ROOT) { | |
1399 | u32 qid1 = TC_H_MAJ(pid); | |
1400 | ||
1401 | if (qid && qid1) { | |
1402 | /* If both majors are known, they must be identical. */ | |
1403 | if (qid != qid1) | |
1404 | return -EINVAL; | |
1405 | } else if (qid1) { | |
1406 | qid = qid1; | |
1407 | } else if (qid == 0) | |
af356afa | 1408 | qid = dev->qdisc->handle; |
1da177e4 LT |
1409 | |
1410 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1411 | * both with parent and child. |
1412 | * | |
1413 | * TC_H_MAJ(pid) still may be unspecified, complete it now. | |
1da177e4 LT |
1414 | */ |
1415 | if (pid) | |
1416 | pid = TC_H_MAKE(qid, pid); | |
1417 | } else { | |
1418 | if (qid == 0) | |
af356afa | 1419 | qid = dev->qdisc->handle; |
1da177e4 LT |
1420 | } |
1421 | ||
1422 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1423 | q = qdisc_lookup(dev, qid); |
1424 | if (!q) | |
1da177e4 LT |
1425 | return -ENOENT; |
1426 | ||
1427 | /* An check that it supports classes */ | |
1428 | cops = q->ops->cl_ops; | |
1429 | if (cops == NULL) | |
1430 | return -EINVAL; | |
1431 | ||
1432 | /* Now try to get class */ | |
1433 | if (clid == 0) { | |
1434 | if (pid == TC_H_ROOT) | |
1435 | clid = qid; | |
1436 | } else | |
1437 | clid = TC_H_MAKE(qid, clid); | |
1438 | ||
1439 | if (clid) | |
1440 | cl = cops->get(q, clid); | |
1441 | ||
1442 | if (cl == 0) { | |
1443 | err = -ENOENT; | |
cc7ec456 ED |
1444 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1445 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1446 | goto out; |
1447 | } else { | |
1448 | switch (n->nlmsg_type) { | |
10297b99 | 1449 | case RTM_NEWTCLASS: |
1da177e4 | 1450 | err = -EEXIST; |
cc7ec456 | 1451 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1452 | goto out; |
1453 | break; | |
1454 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1455 | err = -EOPNOTSUPP; |
1456 | if (cops->delete) | |
1457 | err = cops->delete(q, cl); | |
1da177e4 | 1458 | if (err == 0) |
7316ae88 | 1459 | tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); |
1da177e4 LT |
1460 | goto out; |
1461 | case RTM_GETTCLASS: | |
7316ae88 | 1462 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1463 | goto out; |
1464 | default: | |
1465 | err = -EINVAL; | |
1466 | goto out; | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | new_cl = cl; | |
de6d5cdf PM |
1471 | err = -EOPNOTSUPP; |
1472 | if (cops->change) | |
1473 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1da177e4 | 1474 | if (err == 0) |
7316ae88 | 1475 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1476 | |
1477 | out: | |
1478 | if (cl) | |
1479 | cops->put(q, cl); | |
1480 | ||
1481 | return err; | |
1482 | } | |
1483 | ||
1484 | ||
1485 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1486 | unsigned long cl, | |
e431b8c0 | 1487 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1488 | { |
1489 | struct tcmsg *tcm; | |
1490 | struct nlmsghdr *nlh; | |
27a884dc | 1491 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1492 | struct gnet_dump d; |
20fea08b | 1493 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1494 | |
e431b8c0 | 1495 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1496 | tcm = NLMSG_DATA(nlh); |
1497 | tcm->tcm_family = AF_UNSPEC; | |
16ebb5e0 ED |
1498 | tcm->tcm__pad1 = 0; |
1499 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1500 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1501 | tcm->tcm_parent = q->handle; |
1502 | tcm->tcm_handle = q->handle; | |
1503 | tcm->tcm_info = 0; | |
57e1c487 | 1504 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1505 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1506 | goto nla_put_failure; |
1da177e4 | 1507 | |
102396ae JP |
1508 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1509 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1510 | goto nla_put_failure; |
1da177e4 LT |
1511 | |
1512 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1513 | goto nla_put_failure; |
1da177e4 LT |
1514 | |
1515 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1516 | goto nla_put_failure; |
1da177e4 | 1517 | |
27a884dc | 1518 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1519 | return skb->len; |
1520 | ||
1521 | nlmsg_failure: | |
1e90474c | 1522 | nla_put_failure: |
dc5fc579 | 1523 | nlmsg_trim(skb, b); |
1da177e4 LT |
1524 | return -1; |
1525 | } | |
1526 | ||
7316ae88 TG |
1527 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1528 | struct nlmsghdr *n, struct Qdisc *q, | |
1529 | unsigned long cl, int event) | |
1da177e4 LT |
1530 | { |
1531 | struct sk_buff *skb; | |
1532 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1533 | ||
1534 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1535 | if (!skb) | |
1536 | return -ENOBUFS; | |
1537 | ||
1538 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1539 | kfree_skb(skb); | |
1540 | return -EINVAL; | |
1541 | } | |
1542 | ||
cc7ec456 ED |
1543 | return rtnetlink_send(skb, net, pid, RTNLGRP_TC, |
1544 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
1545 | } |
1546 | ||
cc7ec456 ED |
1547 | struct qdisc_dump_args { |
1548 | struct qdisc_walker w; | |
1549 | struct sk_buff *skb; | |
1550 | struct netlink_callback *cb; | |
1da177e4 LT |
1551 | }; |
1552 | ||
1553 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1554 | { | |
1555 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1556 | ||
1557 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1558 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1559 | } | |
1560 | ||
30723673 DM |
1561 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1562 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1563 | int *t_p, int s_t) | |
1564 | { | |
1565 | struct qdisc_dump_args arg; | |
1566 | ||
1567 | if (tc_qdisc_dump_ignore(q) || | |
1568 | *t_p < s_t || !q->ops->cl_ops || | |
1569 | (tcm->tcm_parent && | |
1570 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1571 | (*t_p)++; | |
1572 | return 0; | |
1573 | } | |
1574 | if (*t_p > s_t) | |
1575 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1576 | arg.w.fn = qdisc_class_dump; | |
1577 | arg.skb = skb; | |
1578 | arg.cb = cb; | |
1579 | arg.w.stop = 0; | |
1580 | arg.w.skip = cb->args[1]; | |
1581 | arg.w.count = 0; | |
1582 | q->ops->cl_ops->walk(q, &arg.w); | |
1583 | cb->args[1] = arg.w.count; | |
1584 | if (arg.w.stop) | |
1585 | return -1; | |
1586 | (*t_p)++; | |
1587 | return 0; | |
1588 | } | |
1589 | ||
1590 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1591 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1592 | int *t_p, int s_t) | |
1593 | { | |
1594 | struct Qdisc *q; | |
1595 | ||
1596 | if (!root) | |
1597 | return 0; | |
1598 | ||
1599 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1600 | return -1; | |
1601 | ||
1602 | list_for_each_entry(q, &root->list, list) { | |
1603 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1604 | return -1; | |
1605 | } | |
1606 | ||
1607 | return 0; | |
1608 | } | |
1609 | ||
1da177e4 LT |
1610 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1611 | { | |
cc7ec456 | 1612 | struct tcmsg *tcm = (struct tcmsg *)NLMSG_DATA(cb->nlh); |
3b1e0a65 | 1613 | struct net *net = sock_net(skb->sk); |
30723673 | 1614 | struct netdev_queue *dev_queue; |
1da177e4 | 1615 | struct net_device *dev; |
30723673 | 1616 | int t, s_t; |
1da177e4 LT |
1617 | |
1618 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) | |
1619 | return 0; | |
cc7ec456 ED |
1620 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
1621 | if (!dev) | |
1da177e4 LT |
1622 | return 0; |
1623 | ||
1624 | s_t = cb->args[0]; | |
1625 | t = 0; | |
1626 | ||
af356afa | 1627 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1628 | goto done; |
1629 | ||
24824a09 ED |
1630 | dev_queue = dev_ingress_queue(dev); |
1631 | if (dev_queue && | |
1632 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
1633 | &t, s_t) < 0) | |
30723673 | 1634 | goto done; |
1da177e4 | 1635 | |
30723673 | 1636 | done: |
1da177e4 LT |
1637 | cb->args[0] = t; |
1638 | ||
1639 | dev_put(dev); | |
1640 | return skb->len; | |
1641 | } | |
1642 | ||
1643 | /* Main classifier routine: scans classifier chain attached | |
cc7ec456 ED |
1644 | * to this qdisc, (optionally) tests for protocol and asks |
1645 | * specific classifiers. | |
1da177e4 | 1646 | */ |
73ca4918 PM |
1647 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1648 | struct tcf_result *res) | |
1649 | { | |
1650 | __be16 protocol = skb->protocol; | |
cc7ec456 | 1651 | int err; |
73ca4918 PM |
1652 | |
1653 | for (; tp; tp = tp->next) { | |
cc7ec456 ED |
1654 | if (tp->protocol != protocol && |
1655 | tp->protocol != htons(ETH_P_ALL)) | |
1656 | continue; | |
1657 | err = tp->classify(skb, tp, res); | |
1658 | ||
1659 | if (err >= 0) { | |
73ca4918 PM |
1660 | #ifdef CONFIG_NET_CLS_ACT |
1661 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1662 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1663 | #endif | |
1664 | return err; | |
1665 | } | |
1666 | } | |
1667 | return -1; | |
1668 | } | |
1669 | EXPORT_SYMBOL(tc_classify_compat); | |
1670 | ||
1da177e4 | 1671 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1672 | struct tcf_result *res) |
1da177e4 LT |
1673 | { |
1674 | int err = 0; | |
1da177e4 LT |
1675 | #ifdef CONFIG_NET_CLS_ACT |
1676 | struct tcf_proto *otp = tp; | |
1677 | reclassify: | |
52bc9747 | 1678 | #endif |
1da177e4 | 1679 | |
73ca4918 | 1680 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1681 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1682 | if (err == TC_ACT_RECLASSIFY) { |
1683 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1684 | tp = otp; | |
1685 | ||
1686 | if (verd++ >= MAX_REC_LOOP) { | |
b60b6592 | 1687 | if (net_ratelimit()) |
cc7ec456 | 1688 | pr_notice("%s: packet reclassify loop" |
b60b6592 | 1689 | " rule prio %u protocol %02x\n", |
cc7ec456 ED |
1690 | tp->q->ops->id, |
1691 | tp->prio & 0xffff, | |
1692 | ntohs(tp->protocol)); | |
73ca4918 | 1693 | return TC_ACT_SHOT; |
1da177e4 | 1694 | } |
73ca4918 PM |
1695 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1696 | goto reclassify; | |
1da177e4 | 1697 | } |
73ca4918 PM |
1698 | #endif |
1699 | return err; | |
1da177e4 | 1700 | } |
73ca4918 | 1701 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1702 | |
a48b5a61 PM |
1703 | void tcf_destroy(struct tcf_proto *tp) |
1704 | { | |
1705 | tp->ops->destroy(tp); | |
1706 | module_put(tp->ops->owner); | |
1707 | kfree(tp); | |
1708 | } | |
1709 | ||
ff31ab56 | 1710 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1711 | { |
1712 | struct tcf_proto *tp; | |
1713 | ||
ff31ab56 PM |
1714 | while ((tp = *fl) != NULL) { |
1715 | *fl = tp->next; | |
a48b5a61 PM |
1716 | tcf_destroy(tp); |
1717 | } | |
1718 | } | |
1719 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1720 | ||
1da177e4 LT |
1721 | #ifdef CONFIG_PROC_FS |
1722 | static int psched_show(struct seq_file *seq, void *v) | |
1723 | { | |
3c0cfc13 PM |
1724 | struct timespec ts; |
1725 | ||
1726 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1727 | seq_printf(seq, "%08x %08x %08x %08x\n", |
ca44d6e6 | 1728 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1729 | 1000000, |
3c0cfc13 | 1730 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1731 | |
1732 | return 0; | |
1733 | } | |
1734 | ||
1735 | static int psched_open(struct inode *inode, struct file *file) | |
1736 | { | |
7e5ab157 | 1737 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1738 | } |
1739 | ||
da7071d7 | 1740 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1741 | .owner = THIS_MODULE, |
1742 | .open = psched_open, | |
1743 | .read = seq_read, | |
1744 | .llseek = seq_lseek, | |
1745 | .release = single_release, | |
10297b99 | 1746 | }; |
7316ae88 TG |
1747 | |
1748 | static int __net_init psched_net_init(struct net *net) | |
1749 | { | |
1750 | struct proc_dir_entry *e; | |
1751 | ||
1752 | e = proc_net_fops_create(net, "psched", 0, &psched_fops); | |
1753 | if (e == NULL) | |
1754 | return -ENOMEM; | |
1755 | ||
1756 | return 0; | |
1757 | } | |
1758 | ||
1759 | static void __net_exit psched_net_exit(struct net *net) | |
1760 | { | |
1761 | proc_net_remove(net, "psched"); | |
7316ae88 TG |
1762 | } |
1763 | #else | |
1764 | static int __net_init psched_net_init(struct net *net) | |
1765 | { | |
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | static void __net_exit psched_net_exit(struct net *net) | |
1770 | { | |
1771 | } | |
1da177e4 LT |
1772 | #endif |
1773 | ||
7316ae88 TG |
1774 | static struct pernet_operations psched_net_ops = { |
1775 | .init = psched_net_init, | |
1776 | .exit = psched_net_exit, | |
1777 | }; | |
1778 | ||
1da177e4 LT |
1779 | static int __init pktsched_init(void) |
1780 | { | |
7316ae88 TG |
1781 | int err; |
1782 | ||
1783 | err = register_pernet_subsys(&psched_net_ops); | |
1784 | if (err) { | |
cc7ec456 | 1785 | pr_err("pktsched_init: " |
7316ae88 TG |
1786 | "cannot initialize per netns operations\n"); |
1787 | return err; | |
1788 | } | |
1789 | ||
1da177e4 LT |
1790 | register_qdisc(&pfifo_qdisc_ops); |
1791 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1792 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1793 | register_qdisc(&mq_qdisc_ops); |
1da177e4 | 1794 | |
c7ac8679 GR |
1795 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL); |
1796 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL); | |
1797 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL); | |
1798 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL); | |
1799 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL); | |
1800 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL); | |
be577ddc | 1801 | |
1da177e4 LT |
1802 | return 0; |
1803 | } | |
1804 | ||
1805 | subsys_initcall(pktsched_init); |