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); | |
190 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) | |
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 JP |
242 | |
243 | q = qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle); | |
f6486d40 | 244 | out: |
f6e0b239 | 245 | return q; |
1da177e4 LT |
246 | } |
247 | ||
248 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
249 | { | |
250 | unsigned long cl; | |
251 | struct Qdisc *leaf; | |
20fea08b | 252 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
253 | |
254 | if (cops == NULL) | |
255 | return NULL; | |
256 | cl = cops->get(p, classid); | |
257 | ||
258 | if (cl == 0) | |
259 | return NULL; | |
260 | leaf = cops->leaf(p, cl); | |
261 | cops->put(p, cl); | |
262 | return leaf; | |
263 | } | |
264 | ||
265 | /* Find queueing discipline by name */ | |
266 | ||
1e90474c | 267 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
268 | { |
269 | struct Qdisc_ops *q = NULL; | |
270 | ||
271 | if (kind) { | |
272 | read_lock(&qdisc_mod_lock); | |
273 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 274 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
275 | if (!try_module_get(q->owner)) |
276 | q = NULL; | |
277 | break; | |
278 | } | |
279 | } | |
280 | read_unlock(&qdisc_mod_lock); | |
281 | } | |
282 | return q; | |
283 | } | |
284 | ||
285 | static struct qdisc_rate_table *qdisc_rtab_list; | |
286 | ||
1e90474c | 287 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
288 | { |
289 | struct qdisc_rate_table *rtab; | |
290 | ||
291 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
292 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
293 | rtab->refcnt++; | |
294 | return rtab; | |
295 | } | |
296 | } | |
297 | ||
5feb5e1a PM |
298 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
299 | nla_len(tab) != TC_RTAB_SIZE) | |
1da177e4 LT |
300 | return NULL; |
301 | ||
302 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
303 | if (rtab) { | |
304 | rtab->rate = *r; | |
305 | rtab->refcnt = 1; | |
1e90474c | 306 | memcpy(rtab->data, nla_data(tab), 1024); |
1da177e4 LT |
307 | rtab->next = qdisc_rtab_list; |
308 | qdisc_rtab_list = rtab; | |
309 | } | |
310 | return rtab; | |
311 | } | |
62e3ba1b | 312 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
313 | |
314 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
315 | { | |
316 | struct qdisc_rate_table *rtab, **rtabp; | |
317 | ||
318 | if (!tab || --tab->refcnt) | |
319 | return; | |
320 | ||
321 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
322 | if (rtab == tab) { | |
323 | *rtabp = rtab->next; | |
324 | kfree(rtab); | |
325 | return; | |
326 | } | |
327 | } | |
328 | } | |
62e3ba1b | 329 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 330 | |
175f9c1b JK |
331 | static LIST_HEAD(qdisc_stab_list); |
332 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
333 | ||
334 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
335 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
336 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
337 | }; | |
338 | ||
339 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
340 | { | |
341 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
342 | struct qdisc_size_table *stab; | |
343 | struct tc_sizespec *s; | |
344 | unsigned int tsize = 0; | |
345 | u16 *tab = NULL; | |
346 | int err; | |
347 | ||
348 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
349 | if (err < 0) | |
350 | return ERR_PTR(err); | |
351 | if (!tb[TCA_STAB_BASE]) | |
352 | return ERR_PTR(-EINVAL); | |
353 | ||
354 | s = nla_data(tb[TCA_STAB_BASE]); | |
355 | ||
356 | if (s->tsize > 0) { | |
357 | if (!tb[TCA_STAB_DATA]) | |
358 | return ERR_PTR(-EINVAL); | |
359 | tab = nla_data(tb[TCA_STAB_DATA]); | |
360 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
361 | } | |
362 | ||
363 | if (!s || tsize != s->tsize || (!tab && tsize > 0)) | |
364 | return ERR_PTR(-EINVAL); | |
365 | ||
f3b9605d | 366 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
367 | |
368 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
369 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
370 | continue; | |
371 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
372 | continue; | |
373 | stab->refcnt++; | |
f3b9605d | 374 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
375 | return stab; |
376 | } | |
377 | ||
f3b9605d | 378 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
379 | |
380 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
381 | if (!stab) | |
382 | return ERR_PTR(-ENOMEM); | |
383 | ||
384 | stab->refcnt = 1; | |
385 | stab->szopts = *s; | |
386 | if (tsize > 0) | |
387 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
388 | ||
f3b9605d | 389 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 390 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 391 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
392 | |
393 | return stab; | |
394 | } | |
395 | ||
396 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
397 | { | |
398 | if (!tab) | |
399 | return; | |
400 | ||
f3b9605d | 401 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
402 | |
403 | if (--tab->refcnt == 0) { | |
404 | list_del(&tab->list); | |
405 | kfree(tab); | |
406 | } | |
407 | ||
f3b9605d | 408 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
409 | } |
410 | EXPORT_SYMBOL(qdisc_put_stab); | |
411 | ||
412 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
413 | { | |
414 | struct nlattr *nest; | |
415 | ||
416 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
417 | if (nest == NULL) |
418 | goto nla_put_failure; | |
175f9c1b JK |
419 | NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); |
420 | nla_nest_end(skb, nest); | |
421 | ||
422 | return skb->len; | |
423 | ||
424 | nla_put_failure: | |
425 | return -1; | |
426 | } | |
427 | ||
428 | void qdisc_calculate_pkt_len(struct sk_buff *skb, struct qdisc_size_table *stab) | |
429 | { | |
430 | int pkt_len, slot; | |
431 | ||
432 | pkt_len = skb->len + stab->szopts.overhead; | |
433 | if (unlikely(!stab->szopts.tsize)) | |
434 | goto out; | |
435 | ||
436 | slot = pkt_len + stab->szopts.cell_align; | |
437 | if (unlikely(slot < 0)) | |
438 | slot = 0; | |
439 | ||
440 | slot >>= stab->szopts.cell_log; | |
441 | if (likely(slot < stab->szopts.tsize)) | |
442 | pkt_len = stab->data[slot]; | |
443 | else | |
444 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
445 | (slot / stab->szopts.tsize) + | |
446 | stab->data[slot % stab->szopts.tsize]; | |
447 | ||
448 | pkt_len <<= stab->szopts.size_log; | |
449 | out: | |
450 | if (unlikely(pkt_len < 1)) | |
451 | pkt_len = 1; | |
452 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
453 | } | |
454 | EXPORT_SYMBOL(qdisc_calculate_pkt_len); | |
455 | ||
b00355db JP |
456 | void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc) |
457 | { | |
458 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
459 | printk(KERN_WARNING | |
460 | "%s: %s qdisc %X: is non-work-conserving?\n", | |
461 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
462 | qdisc->flags |= TCQ_F_WARN_NONWC; | |
463 | } | |
464 | } | |
465 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
466 | ||
4179477f PM |
467 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
468 | { | |
469 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 470 | timer); |
4179477f PM |
471 | |
472 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
8608db03 | 473 | __netif_schedule(qdisc_root(wd->qdisc)); |
1936502d | 474 | |
4179477f PM |
475 | return HRTIMER_NORESTART; |
476 | } | |
477 | ||
478 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
479 | { | |
2fbd3da3 DM |
480 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
481 | wd->timer.function = qdisc_watchdog; | |
4179477f PM |
482 | wd->qdisc = qdisc; |
483 | } | |
484 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
485 | ||
486 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
487 | { | |
488 | ktime_t time; | |
489 | ||
2540e051 JP |
490 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
491 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
492 | return; | |
493 | ||
4179477f PM |
494 | wd->qdisc->flags |= TCQ_F_THROTTLED; |
495 | time = ktime_set(0, 0); | |
ca44d6e6 | 496 | time = ktime_add_ns(time, PSCHED_TICKS2NS(expires)); |
2fbd3da3 | 497 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); |
4179477f PM |
498 | } |
499 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
500 | ||
501 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
502 | { | |
2fbd3da3 | 503 | hrtimer_cancel(&wd->timer); |
4179477f PM |
504 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; |
505 | } | |
506 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 507 | |
a94f779f | 508 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
509 | { |
510 | unsigned int size = n * sizeof(struct hlist_head), i; | |
511 | struct hlist_head *h; | |
512 | ||
513 | if (size <= PAGE_SIZE) | |
514 | h = kmalloc(size, GFP_KERNEL); | |
515 | else | |
516 | h = (struct hlist_head *) | |
517 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
518 | ||
519 | if (h != NULL) { | |
520 | for (i = 0; i < n; i++) | |
521 | INIT_HLIST_HEAD(&h[i]); | |
522 | } | |
523 | return h; | |
524 | } | |
525 | ||
526 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
527 | { | |
528 | unsigned int size = n * sizeof(struct hlist_head); | |
529 | ||
530 | if (size <= PAGE_SIZE) | |
531 | kfree(h); | |
532 | else | |
533 | free_pages((unsigned long)h, get_order(size)); | |
534 | } | |
535 | ||
536 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
537 | { | |
538 | struct Qdisc_class_common *cl; | |
539 | struct hlist_node *n, *next; | |
540 | struct hlist_head *nhash, *ohash; | |
541 | unsigned int nsize, nmask, osize; | |
542 | unsigned int i, h; | |
543 | ||
544 | /* Rehash when load factor exceeds 0.75 */ | |
545 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
546 | return; | |
547 | nsize = clhash->hashsize * 2; | |
548 | nmask = nsize - 1; | |
549 | nhash = qdisc_class_hash_alloc(nsize); | |
550 | if (nhash == NULL) | |
551 | return; | |
552 | ||
553 | ohash = clhash->hash; | |
554 | osize = clhash->hashsize; | |
555 | ||
556 | sch_tree_lock(sch); | |
557 | for (i = 0; i < osize; i++) { | |
558 | hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) { | |
559 | h = qdisc_class_hash(cl->classid, nmask); | |
560 | hlist_add_head(&cl->hnode, &nhash[h]); | |
561 | } | |
562 | } | |
563 | clhash->hash = nhash; | |
564 | clhash->hashsize = nsize; | |
565 | clhash->hashmask = nmask; | |
566 | sch_tree_unlock(sch); | |
567 | ||
568 | qdisc_class_hash_free(ohash, osize); | |
569 | } | |
570 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
571 | ||
572 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
573 | { | |
574 | unsigned int size = 4; | |
575 | ||
576 | clhash->hash = qdisc_class_hash_alloc(size); | |
577 | if (clhash->hash == NULL) | |
578 | return -ENOMEM; | |
579 | clhash->hashsize = size; | |
580 | clhash->hashmask = size - 1; | |
581 | clhash->hashelems = 0; | |
582 | return 0; | |
583 | } | |
584 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
585 | ||
586 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
587 | { | |
588 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
589 | } | |
590 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
591 | ||
592 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
593 | struct Qdisc_class_common *cl) | |
594 | { | |
595 | unsigned int h; | |
596 | ||
597 | INIT_HLIST_NODE(&cl->hnode); | |
598 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
599 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
600 | clhash->hashelems++; | |
601 | } | |
602 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
603 | ||
604 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
605 | struct Qdisc_class_common *cl) | |
606 | { | |
607 | hlist_del(&cl->hnode); | |
608 | clhash->hashelems--; | |
609 | } | |
610 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
611 | ||
1da177e4 LT |
612 | /* Allocate an unique handle from space managed by kernel */ |
613 | ||
614 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
615 | { | |
616 | int i = 0x10000; | |
617 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
618 | ||
619 | do { | |
620 | autohandle += TC_H_MAKE(0x10000U, 0); | |
621 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
622 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
623 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
624 | ||
625 | return i>0 ? autohandle : 0; | |
626 | } | |
627 | ||
43effa1e PM |
628 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
629 | { | |
20fea08b | 630 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
631 | unsigned long cl; |
632 | u32 parentid; | |
633 | ||
634 | if (n == 0) | |
635 | return; | |
636 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
637 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
638 | return; | |
639 | ||
5ce2d488 | 640 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
641 | if (sch == NULL) { |
642 | WARN_ON(parentid != TC_H_ROOT); | |
643 | return; | |
644 | } | |
43effa1e PM |
645 | cops = sch->ops->cl_ops; |
646 | if (cops->qlen_notify) { | |
647 | cl = cops->get(sch, parentid); | |
648 | cops->qlen_notify(sch, cl); | |
649 | cops->put(sch, cl); | |
650 | } | |
651 | sch->q.qlen -= n; | |
652 | } | |
653 | } | |
654 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 655 | |
7316ae88 TG |
656 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
657 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
658 | struct Qdisc *old, struct Qdisc *new) |
659 | { | |
660 | if (new || old) | |
7316ae88 | 661 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 662 | |
4d8863a2 | 663 | if (old) |
99194cff | 664 | qdisc_destroy(old); |
99194cff DM |
665 | } |
666 | ||
667 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
668 | * to device "dev". | |
669 | * | |
670 | * When appropriate send a netlink notification using 'skb' | |
671 | * and "n". | |
672 | * | |
673 | * On success, destroy old qdisc. | |
1da177e4 LT |
674 | */ |
675 | ||
676 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
677 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
678 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 679 | { |
99194cff | 680 | struct Qdisc *q = old; |
7316ae88 | 681 | struct net *net = dev_net(dev); |
1da177e4 | 682 | int err = 0; |
1da177e4 | 683 | |
10297b99 | 684 | if (parent == NULL) { |
99194cff DM |
685 | unsigned int i, num_q, ingress; |
686 | ||
687 | ingress = 0; | |
688 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
689 | if ((q && q->flags & TCQ_F_INGRESS) || |
690 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
691 | num_q = 1; |
692 | ingress = 1; | |
693 | } | |
694 | ||
695 | if (dev->flags & IFF_UP) | |
696 | dev_deactivate(dev); | |
697 | ||
6ec1c69a DM |
698 | if (new && new->ops->attach) { |
699 | new->ops->attach(new); | |
700 | num_q = 0; | |
701 | } | |
702 | ||
99194cff DM |
703 | for (i = 0; i < num_q; i++) { |
704 | struct netdev_queue *dev_queue = &dev->rx_queue; | |
705 | ||
706 | if (!ingress) | |
707 | dev_queue = netdev_get_tx_queue(dev, i); | |
708 | ||
8d50b53d DM |
709 | old = dev_graft_qdisc(dev_queue, new); |
710 | if (new && i > 0) | |
711 | atomic_inc(&new->refcnt); | |
712 | ||
036d6a67 JP |
713 | if (!ingress) |
714 | qdisc_destroy(old); | |
1da177e4 | 715 | } |
99194cff | 716 | |
036d6a67 | 717 | if (!ingress) { |
7316ae88 TG |
718 | notify_and_destroy(net, skb, n, classid, |
719 | dev->qdisc, new); | |
036d6a67 JP |
720 | if (new && !new->ops->attach) |
721 | atomic_inc(&new->refcnt); | |
722 | dev->qdisc = new ? : &noop_qdisc; | |
723 | } else { | |
7316ae88 | 724 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 725 | } |
af356afa | 726 | |
99194cff DM |
727 | if (dev->flags & IFF_UP) |
728 | dev_activate(dev); | |
1da177e4 | 729 | } else { |
20fea08b | 730 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 731 | |
c9f1d038 PM |
732 | err = -EOPNOTSUPP; |
733 | if (cops && cops->graft) { | |
1da177e4 LT |
734 | unsigned long cl = cops->get(parent, classid); |
735 | if (cl) { | |
99194cff | 736 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 737 | cops->put(parent, cl); |
c9f1d038 PM |
738 | } else |
739 | err = -ENOENT; | |
1da177e4 | 740 | } |
99194cff | 741 | if (!err) |
7316ae88 | 742 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
743 | } |
744 | return err; | |
745 | } | |
746 | ||
25bfcd5a JP |
747 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
748 | static struct lock_class_key qdisc_tx_lock; | |
749 | static struct lock_class_key qdisc_rx_lock; | |
750 | ||
1da177e4 LT |
751 | /* |
752 | Allocate and initialize new qdisc. | |
753 | ||
754 | Parameters are passed via opt. | |
755 | */ | |
756 | ||
757 | static struct Qdisc * | |
bb949fbd | 758 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
23bcf634 PM |
759 | struct Qdisc *p, u32 parent, u32 handle, |
760 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
761 | { |
762 | int err; | |
1e90474c | 763 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
764 | struct Qdisc *sch; |
765 | struct Qdisc_ops *ops; | |
175f9c1b | 766 | struct qdisc_size_table *stab; |
1da177e4 LT |
767 | |
768 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 769 | #ifdef CONFIG_MODULES |
1da177e4 LT |
770 | if (ops == NULL && kind != NULL) { |
771 | char name[IFNAMSIZ]; | |
1e90474c | 772 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
773 | /* We dropped the RTNL semaphore in order to |
774 | * perform the module load. So, even if we | |
775 | * succeeded in loading the module we have to | |
776 | * tell the caller to replay the request. We | |
777 | * indicate this using -EAGAIN. | |
778 | * We replay the request because the device may | |
779 | * go away in the mean time. | |
780 | */ | |
781 | rtnl_unlock(); | |
782 | request_module("sch_%s", name); | |
783 | rtnl_lock(); | |
784 | ops = qdisc_lookup_ops(kind); | |
785 | if (ops != NULL) { | |
786 | /* We will try again qdisc_lookup_ops, | |
787 | * so don't keep a reference. | |
788 | */ | |
789 | module_put(ops->owner); | |
790 | err = -EAGAIN; | |
791 | goto err_out; | |
792 | } | |
793 | } | |
794 | } | |
795 | #endif | |
796 | ||
b9e2cc0f | 797 | err = -ENOENT; |
1da177e4 LT |
798 | if (ops == NULL) |
799 | goto err_out; | |
800 | ||
5ce2d488 | 801 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
802 | if (IS_ERR(sch)) { |
803 | err = PTR_ERR(sch); | |
1da177e4 | 804 | goto err_out2; |
3d54b82f | 805 | } |
1da177e4 | 806 | |
ffc8fefa PM |
807 | sch->parent = parent; |
808 | ||
3d54b82f | 809 | if (handle == TC_H_INGRESS) { |
1da177e4 | 810 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 811 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 812 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 813 | } else { |
fd44de7c PM |
814 | if (handle == 0) { |
815 | handle = qdisc_alloc_handle(dev); | |
816 | err = -ENOMEM; | |
817 | if (handle == 0) | |
818 | goto err_out3; | |
819 | } | |
25bfcd5a | 820 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1da177e4 LT |
821 | } |
822 | ||
3d54b82f | 823 | sch->handle = handle; |
1da177e4 | 824 | |
1e90474c | 825 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
826 | if (tca[TCA_STAB]) { |
827 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
828 | if (IS_ERR(stab)) { | |
829 | err = PTR_ERR(stab); | |
7c64b9f3 | 830 | goto err_out4; |
175f9c1b JK |
831 | } |
832 | sch->stab = stab; | |
833 | } | |
1e90474c | 834 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
835 | spinlock_t *root_lock; |
836 | ||
23bcf634 PM |
837 | err = -EOPNOTSUPP; |
838 | if (sch->flags & TCQ_F_MQROOT) | |
839 | goto err_out4; | |
840 | ||
f6f9b93f | 841 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
842 | !(sch->flags & TCQ_F_INGRESS) && |
843 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
f6f9b93f JP |
844 | root_lock = qdisc_root_sleeping_lock(sch); |
845 | else | |
846 | root_lock = qdisc_lock(sch); | |
847 | ||
023e09a7 | 848 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f | 849 | root_lock, tca[TCA_RATE]); |
23bcf634 PM |
850 | if (err) |
851 | goto err_out4; | |
023e09a7 | 852 | } |
f6e0b239 JP |
853 | |
854 | qdisc_list_add(sch); | |
1da177e4 | 855 | |
1da177e4 LT |
856 | return sch; |
857 | } | |
858 | err_out3: | |
859 | dev_put(dev); | |
3d54b82f | 860 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
861 | err_out2: |
862 | module_put(ops->owner); | |
863 | err_out: | |
864 | *errp = err; | |
1da177e4 | 865 | return NULL; |
23bcf634 PM |
866 | |
867 | err_out4: | |
868 | /* | |
869 | * Any broken qdiscs that would require a ops->reset() here? | |
870 | * The qdisc was never in action so it shouldn't be necessary. | |
871 | */ | |
7c64b9f3 | 872 | qdisc_put_stab(sch->stab); |
23bcf634 PM |
873 | if (ops->destroy) |
874 | ops->destroy(sch); | |
875 | goto err_out3; | |
1da177e4 LT |
876 | } |
877 | ||
1e90474c | 878 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 879 | { |
175f9c1b JK |
880 | struct qdisc_size_table *stab = NULL; |
881 | int err = 0; | |
1da177e4 | 882 | |
175f9c1b | 883 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
884 | if (sch->ops->change == NULL) |
885 | return -EINVAL; | |
1e90474c | 886 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
887 | if (err) |
888 | return err; | |
889 | } | |
175f9c1b JK |
890 | |
891 | if (tca[TCA_STAB]) { | |
892 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
893 | if (IS_ERR(stab)) | |
894 | return PTR_ERR(stab); | |
895 | } | |
896 | ||
897 | qdisc_put_stab(sch->stab); | |
898 | sch->stab = stab; | |
899 | ||
23bcf634 | 900 | if (tca[TCA_RATE]) { |
71bcb09a SH |
901 | /* NB: ignores errors from replace_estimator |
902 | because change can't be undone. */ | |
23bcf634 PM |
903 | if (sch->flags & TCQ_F_MQROOT) |
904 | goto out; | |
1da177e4 | 905 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
71bcb09a SH |
906 | qdisc_root_sleeping_lock(sch), |
907 | tca[TCA_RATE]); | |
23bcf634 PM |
908 | } |
909 | out: | |
1da177e4 LT |
910 | return 0; |
911 | } | |
912 | ||
913 | struct check_loop_arg | |
914 | { | |
915 | struct qdisc_walker w; | |
916 | struct Qdisc *p; | |
917 | int depth; | |
918 | }; | |
919 | ||
920 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
921 | ||
922 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
923 | { | |
924 | struct check_loop_arg arg; | |
925 | ||
926 | if (q->ops->cl_ops == NULL) | |
927 | return 0; | |
928 | ||
929 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
930 | arg.w.fn = check_loop_fn; | |
931 | arg.depth = depth; | |
932 | arg.p = p; | |
933 | q->ops->cl_ops->walk(q, &arg.w); | |
934 | return arg.w.stop ? -ELOOP : 0; | |
935 | } | |
936 | ||
937 | static int | |
938 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
939 | { | |
940 | struct Qdisc *leaf; | |
20fea08b | 941 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
942 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
943 | ||
944 | leaf = cops->leaf(q, cl); | |
945 | if (leaf) { | |
946 | if (leaf == arg->p || arg->depth > 7) | |
947 | return -ELOOP; | |
948 | return check_loop(leaf, arg->p, arg->depth + 1); | |
949 | } | |
950 | return 0; | |
951 | } | |
952 | ||
953 | /* | |
954 | * Delete/get qdisc. | |
955 | */ | |
956 | ||
957 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
958 | { | |
3b1e0a65 | 959 | struct net *net = sock_net(skb->sk); |
1da177e4 | 960 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 961 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
962 | struct net_device *dev; |
963 | u32 clid = tcm->tcm_parent; | |
964 | struct Qdisc *q = NULL; | |
965 | struct Qdisc *p = NULL; | |
966 | int err; | |
967 | ||
7316ae88 | 968 | if ((dev = __dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
969 | return -ENODEV; |
970 | ||
1e90474c PM |
971 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
972 | if (err < 0) | |
973 | return err; | |
974 | ||
1da177e4 LT |
975 | if (clid) { |
976 | if (clid != TC_H_ROOT) { | |
977 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
978 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
979 | return -ENOENT; | |
980 | q = qdisc_leaf(p, clid); | |
981 | } else { /* ingress */ | |
8123b421 | 982 | q = dev->rx_queue.qdisc_sleeping; |
10297b99 | 983 | } |
1da177e4 | 984 | } else { |
af356afa | 985 | q = dev->qdisc; |
1da177e4 LT |
986 | } |
987 | if (!q) | |
988 | return -ENOENT; | |
989 | ||
990 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
991 | return -EINVAL; | |
992 | } else { | |
993 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
994 | return -ENOENT; | |
995 | } | |
996 | ||
1e90474c | 997 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
998 | return -EINVAL; |
999 | ||
1000 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1001 | if (!clid) | |
1002 | return -EINVAL; | |
1003 | if (q->handle == 0) | |
1004 | return -ENOENT; | |
99194cff | 1005 | if ((err = qdisc_graft(dev, p, skb, n, clid, NULL, q)) != 0) |
1da177e4 | 1006 | return err; |
1da177e4 | 1007 | } else { |
7316ae88 | 1008 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1009 | } |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | Create/change qdisc. | |
1015 | */ | |
1016 | ||
1017 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1018 | { | |
3b1e0a65 | 1019 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1020 | struct tcmsg *tcm; |
1e90474c | 1021 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1022 | struct net_device *dev; |
1023 | u32 clid; | |
1024 | struct Qdisc *q, *p; | |
1025 | int err; | |
1026 | ||
1027 | replay: | |
1028 | /* Reinit, just in case something touches this. */ | |
1029 | tcm = NLMSG_DATA(n); | |
1da177e4 LT |
1030 | clid = tcm->tcm_parent; |
1031 | q = p = NULL; | |
1032 | ||
7316ae88 | 1033 | if ((dev = __dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1034 | return -ENODEV; |
1035 | ||
1e90474c PM |
1036 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1037 | if (err < 0) | |
1038 | return err; | |
1039 | ||
1da177e4 LT |
1040 | if (clid) { |
1041 | if (clid != TC_H_ROOT) { | |
1042 | if (clid != TC_H_INGRESS) { | |
1043 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
1044 | return -ENOENT; | |
1045 | q = qdisc_leaf(p, clid); | |
1046 | } else { /*ingress */ | |
8123b421 | 1047 | q = dev->rx_queue.qdisc_sleeping; |
1da177e4 LT |
1048 | } |
1049 | } else { | |
af356afa | 1050 | q = dev->qdisc; |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | /* It may be default qdisc, ignore it */ | |
1054 | if (q && q->handle == 0) | |
1055 | q = NULL; | |
1056 | ||
1057 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1058 | if (tcm->tcm_handle) { | |
1059 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
1060 | return -EEXIST; | |
1061 | if (TC_H_MIN(tcm->tcm_handle)) | |
1062 | return -EINVAL; | |
1063 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
1064 | goto create_n_graft; | |
1065 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1066 | return -EEXIST; | |
1e90474c | 1067 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1068 | return -EINVAL; |
1069 | if (q == p || | |
1070 | (p && check_loop(q, p, 0))) | |
1071 | return -ELOOP; | |
1072 | atomic_inc(&q->refcnt); | |
1073 | goto graft; | |
1074 | } else { | |
1075 | if (q == NULL) | |
1076 | goto create_n_graft; | |
1077 | ||
1078 | /* This magic test requires explanation. | |
1079 | * | |
1080 | * We know, that some child q is already | |
1081 | * attached to this parent and have choice: | |
1082 | * either to change it or to create/graft new one. | |
1083 | * | |
1084 | * 1. We are allowed to create/graft only | |
1085 | * if CREATE and REPLACE flags are set. | |
1086 | * | |
1087 | * 2. If EXCL is set, requestor wanted to say, | |
1088 | * that qdisc tcm_handle is not expected | |
1089 | * to exist, so that we choose create/graft too. | |
1090 | * | |
1091 | * 3. The last case is when no flags are set. | |
1092 | * Alas, it is sort of hole in API, we | |
1093 | * cannot decide what to do unambiguously. | |
1094 | * For now we select create/graft, if | |
1095 | * user gave KIND, which does not match existing. | |
1096 | */ | |
1097 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
1098 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
1099 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
1e90474c PM |
1100 | (tca[TCA_KIND] && |
1101 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1102 | goto create_n_graft; |
1103 | } | |
1104 | } | |
1105 | } else { | |
1106 | if (!tcm->tcm_handle) | |
1107 | return -EINVAL; | |
1108 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1109 | } | |
1110 | ||
1111 | /* Change qdisc parameters */ | |
1112 | if (q == NULL) | |
1113 | return -ENOENT; | |
1114 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1115 | return -EEXIST; | |
1e90474c | 1116 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1117 | return -EINVAL; |
1118 | err = qdisc_change(q, tca); | |
1119 | if (err == 0) | |
7316ae88 | 1120 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1121 | return err; |
1122 | ||
1123 | create_n_graft: | |
1124 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
1125 | return -ENOENT; | |
1126 | if (clid == TC_H_INGRESS) | |
23bcf634 | 1127 | q = qdisc_create(dev, &dev->rx_queue, p, |
bb949fbd | 1128 | tcm->tcm_parent, tcm->tcm_parent, |
ffc8fefa | 1129 | tca, &err); |
6ec1c69a | 1130 | else { |
926e61b7 | 1131 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1132 | |
1133 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1134 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1135 | else if (p) | |
1136 | dev_queue = p->dev_queue; | |
1137 | else | |
1138 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1139 | |
926e61b7 | 1140 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1141 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1142 | tca, &err); |
6ec1c69a | 1143 | } |
1da177e4 LT |
1144 | if (q == NULL) { |
1145 | if (err == -EAGAIN) | |
1146 | goto replay; | |
1147 | return err; | |
1148 | } | |
1149 | ||
1150 | graft: | |
e5befbd9 IJ |
1151 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1152 | if (err) { | |
1153 | if (q) | |
1154 | qdisc_destroy(q); | |
1155 | return err; | |
1da177e4 | 1156 | } |
e5befbd9 | 1157 | |
1da177e4 LT |
1158 | return 0; |
1159 | } | |
1160 | ||
1161 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 1162 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1163 | { |
1164 | struct tcmsg *tcm; | |
1165 | struct nlmsghdr *nlh; | |
27a884dc | 1166 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1167 | struct gnet_dump d; |
1168 | ||
e431b8c0 | 1169 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1170 | tcm = NLMSG_DATA(nlh); |
1171 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1172 | tcm->tcm__pad1 = 0; |
1173 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1174 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1175 | tcm->tcm_parent = clid; |
1176 | tcm->tcm_handle = q->handle; | |
1177 | tcm->tcm_info = atomic_read(&q->refcnt); | |
57e1c487 | 1178 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1179 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1180 | goto nla_put_failure; |
1da177e4 LT |
1181 | q->qstats.qlen = q->q.qlen; |
1182 | ||
175f9c1b JK |
1183 | if (q->stab && qdisc_dump_stab(skb, q->stab) < 0) |
1184 | goto nla_put_failure; | |
1185 | ||
102396ae JP |
1186 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1187 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1188 | goto nla_put_failure; |
1da177e4 LT |
1189 | |
1190 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1191 | goto nla_put_failure; |
1da177e4 LT |
1192 | |
1193 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
d250a5f9 | 1194 | gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || |
1da177e4 | 1195 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1196 | goto nla_put_failure; |
10297b99 | 1197 | |
1da177e4 | 1198 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1199 | goto nla_put_failure; |
10297b99 | 1200 | |
27a884dc | 1201 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1202 | return skb->len; |
1203 | ||
1204 | nlmsg_failure: | |
1e90474c | 1205 | nla_put_failure: |
dc5fc579 | 1206 | nlmsg_trim(skb, b); |
1da177e4 LT |
1207 | return -1; |
1208 | } | |
1209 | ||
53b0f080 ED |
1210 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1211 | { | |
1212 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1213 | } | |
1214 | ||
7316ae88 TG |
1215 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1216 | struct nlmsghdr *n, u32 clid, | |
1217 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1218 | { |
1219 | struct sk_buff *skb; | |
1220 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1221 | ||
1222 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1223 | if (!skb) | |
1224 | return -ENOBUFS; | |
1225 | ||
53b0f080 | 1226 | if (old && !tc_qdisc_dump_ignore(old)) { |
1da177e4 LT |
1227 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) |
1228 | goto err_out; | |
1229 | } | |
53b0f080 | 1230 | if (new && !tc_qdisc_dump_ignore(new)) { |
1da177e4 LT |
1231 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
1232 | goto err_out; | |
1233 | } | |
1234 | ||
1235 | if (skb->len) | |
7316ae88 | 1236 | return rtnetlink_send(skb, net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1237 | |
1238 | err_out: | |
1239 | kfree_skb(skb); | |
1240 | return -EINVAL; | |
1241 | } | |
1242 | ||
30723673 DM |
1243 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1244 | struct netlink_callback *cb, | |
1245 | int *q_idx_p, int s_q_idx) | |
1246 | { | |
1247 | int ret = 0, q_idx = *q_idx_p; | |
1248 | struct Qdisc *q; | |
1249 | ||
1250 | if (!root) | |
1251 | return 0; | |
1252 | ||
1253 | q = root; | |
1254 | if (q_idx < s_q_idx) { | |
1255 | q_idx++; | |
1256 | } else { | |
1257 | if (!tc_qdisc_dump_ignore(q) && | |
1258 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1259 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1260 | goto done; | |
1261 | q_idx++; | |
1262 | } | |
1263 | list_for_each_entry(q, &root->list, list) { | |
1264 | if (q_idx < s_q_idx) { | |
1265 | q_idx++; | |
1266 | continue; | |
1267 | } | |
1268 | if (!tc_qdisc_dump_ignore(q) && | |
1269 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1270 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1271 | goto done; | |
1272 | q_idx++; | |
1273 | } | |
1274 | ||
1275 | out: | |
1276 | *q_idx_p = q_idx; | |
1277 | return ret; | |
1278 | done: | |
1279 | ret = -1; | |
1280 | goto out; | |
1281 | } | |
1282 | ||
1da177e4 LT |
1283 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1284 | { | |
3b1e0a65 | 1285 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1286 | int idx, q_idx; |
1287 | int s_idx, s_q_idx; | |
1288 | struct net_device *dev; | |
1da177e4 LT |
1289 | |
1290 | s_idx = cb->args[0]; | |
1291 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1292 | |
1293 | rcu_read_lock(); | |
7562f876 | 1294 | idx = 0; |
7316ae88 | 1295 | for_each_netdev_rcu(net, dev) { |
30723673 DM |
1296 | struct netdev_queue *dev_queue; |
1297 | ||
1da177e4 | 1298 | if (idx < s_idx) |
7562f876 | 1299 | goto cont; |
1da177e4 LT |
1300 | if (idx > s_idx) |
1301 | s_q_idx = 0; | |
1da177e4 | 1302 | q_idx = 0; |
30723673 | 1303 | |
af356afa | 1304 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1305 | goto done; |
1306 | ||
1307 | dev_queue = &dev->rx_queue; | |
827ebd64 | 1308 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1309 | goto done; |
1310 | ||
7562f876 PE |
1311 | cont: |
1312 | idx++; | |
1da177e4 LT |
1313 | } |
1314 | ||
1315 | done: | |
f1e9016d | 1316 | rcu_read_unlock(); |
1da177e4 LT |
1317 | |
1318 | cb->args[0] = idx; | |
1319 | cb->args[1] = q_idx; | |
1320 | ||
1321 | return skb->len; | |
1322 | } | |
1323 | ||
1324 | ||
1325 | ||
1326 | /************************************************ | |
1327 | * Traffic classes manipulation. * | |
1328 | ************************************************/ | |
1329 | ||
1330 | ||
1331 | ||
1332 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1333 | { | |
3b1e0a65 | 1334 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1335 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 1336 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1337 | struct net_device *dev; |
1338 | struct Qdisc *q = NULL; | |
20fea08b | 1339 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1340 | unsigned long cl = 0; |
1341 | unsigned long new_cl; | |
1342 | u32 pid = tcm->tcm_parent; | |
1343 | u32 clid = tcm->tcm_handle; | |
1344 | u32 qid = TC_H_MAJ(clid); | |
1345 | int err; | |
1346 | ||
7316ae88 | 1347 | if ((dev = __dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1348 | return -ENODEV; |
1349 | ||
1e90474c PM |
1350 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1351 | if (err < 0) | |
1352 | return err; | |
1353 | ||
1da177e4 LT |
1354 | /* |
1355 | parent == TC_H_UNSPEC - unspecified parent. | |
1356 | parent == TC_H_ROOT - class is root, which has no parent. | |
1357 | parent == X:0 - parent is root class. | |
1358 | parent == X:Y - parent is a node in hierarchy. | |
1359 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1360 | ||
1361 | handle == 0:0 - generate handle from kernel pool. | |
1362 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1363 | handle == X:Y - clear. | |
1364 | handle == X:0 - root class. | |
1365 | */ | |
1366 | ||
1367 | /* Step 1. Determine qdisc handle X:0 */ | |
1368 | ||
1369 | if (pid != TC_H_ROOT) { | |
1370 | u32 qid1 = TC_H_MAJ(pid); | |
1371 | ||
1372 | if (qid && qid1) { | |
1373 | /* If both majors are known, they must be identical. */ | |
1374 | if (qid != qid1) | |
1375 | return -EINVAL; | |
1376 | } else if (qid1) { | |
1377 | qid = qid1; | |
1378 | } else if (qid == 0) | |
af356afa | 1379 | qid = dev->qdisc->handle; |
1da177e4 LT |
1380 | |
1381 | /* Now qid is genuine qdisc handle consistent | |
1382 | both with parent and child. | |
1383 | ||
1384 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
1385 | */ | |
1386 | if (pid) | |
1387 | pid = TC_H_MAKE(qid, pid); | |
1388 | } else { | |
1389 | if (qid == 0) | |
af356afa | 1390 | qid = dev->qdisc->handle; |
1da177e4 LT |
1391 | } |
1392 | ||
1393 | /* OK. Locate qdisc */ | |
10297b99 | 1394 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
1da177e4 LT |
1395 | return -ENOENT; |
1396 | ||
1397 | /* An check that it supports classes */ | |
1398 | cops = q->ops->cl_ops; | |
1399 | if (cops == NULL) | |
1400 | return -EINVAL; | |
1401 | ||
1402 | /* Now try to get class */ | |
1403 | if (clid == 0) { | |
1404 | if (pid == TC_H_ROOT) | |
1405 | clid = qid; | |
1406 | } else | |
1407 | clid = TC_H_MAKE(qid, clid); | |
1408 | ||
1409 | if (clid) | |
1410 | cl = cops->get(q, clid); | |
1411 | ||
1412 | if (cl == 0) { | |
1413 | err = -ENOENT; | |
1414 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
1415 | goto out; | |
1416 | } else { | |
1417 | switch (n->nlmsg_type) { | |
10297b99 | 1418 | case RTM_NEWTCLASS: |
1da177e4 LT |
1419 | err = -EEXIST; |
1420 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1421 | goto out; | |
1422 | break; | |
1423 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1424 | err = -EOPNOTSUPP; |
1425 | if (cops->delete) | |
1426 | err = cops->delete(q, cl); | |
1da177e4 | 1427 | if (err == 0) |
7316ae88 | 1428 | tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); |
1da177e4 LT |
1429 | goto out; |
1430 | case RTM_GETTCLASS: | |
7316ae88 | 1431 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1432 | goto out; |
1433 | default: | |
1434 | err = -EINVAL; | |
1435 | goto out; | |
1436 | } | |
1437 | } | |
1438 | ||
1439 | new_cl = cl; | |
de6d5cdf PM |
1440 | err = -EOPNOTSUPP; |
1441 | if (cops->change) | |
1442 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1da177e4 | 1443 | if (err == 0) |
7316ae88 | 1444 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1445 | |
1446 | out: | |
1447 | if (cl) | |
1448 | cops->put(q, cl); | |
1449 | ||
1450 | return err; | |
1451 | } | |
1452 | ||
1453 | ||
1454 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1455 | unsigned long cl, | |
e431b8c0 | 1456 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1457 | { |
1458 | struct tcmsg *tcm; | |
1459 | struct nlmsghdr *nlh; | |
27a884dc | 1460 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1461 | struct gnet_dump d; |
20fea08b | 1462 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1463 | |
e431b8c0 | 1464 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1465 | tcm = NLMSG_DATA(nlh); |
1466 | tcm->tcm_family = AF_UNSPEC; | |
16ebb5e0 ED |
1467 | tcm->tcm__pad1 = 0; |
1468 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1469 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1470 | tcm->tcm_parent = q->handle; |
1471 | tcm->tcm_handle = q->handle; | |
1472 | tcm->tcm_info = 0; | |
57e1c487 | 1473 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1474 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1475 | goto nla_put_failure; |
1da177e4 | 1476 | |
102396ae JP |
1477 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1478 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1479 | goto nla_put_failure; |
1da177e4 LT |
1480 | |
1481 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1482 | goto nla_put_failure; |
1da177e4 LT |
1483 | |
1484 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1485 | goto nla_put_failure; |
1da177e4 | 1486 | |
27a884dc | 1487 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1488 | return skb->len; |
1489 | ||
1490 | nlmsg_failure: | |
1e90474c | 1491 | nla_put_failure: |
dc5fc579 | 1492 | nlmsg_trim(skb, b); |
1da177e4 LT |
1493 | return -1; |
1494 | } | |
1495 | ||
7316ae88 TG |
1496 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1497 | struct nlmsghdr *n, struct Qdisc *q, | |
1498 | unsigned long cl, int event) | |
1da177e4 LT |
1499 | { |
1500 | struct sk_buff *skb; | |
1501 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1502 | ||
1503 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1504 | if (!skb) | |
1505 | return -ENOBUFS; | |
1506 | ||
1507 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1508 | kfree_skb(skb); | |
1509 | return -EINVAL; | |
1510 | } | |
1511 | ||
7316ae88 | 1512 | return rtnetlink_send(skb, net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1513 | } |
1514 | ||
1515 | struct qdisc_dump_args | |
1516 | { | |
1517 | struct qdisc_walker w; | |
1518 | struct sk_buff *skb; | |
1519 | struct netlink_callback *cb; | |
1520 | }; | |
1521 | ||
1522 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1523 | { | |
1524 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1525 | ||
1526 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1527 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1528 | } | |
1529 | ||
30723673 DM |
1530 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1531 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1532 | int *t_p, int s_t) | |
1533 | { | |
1534 | struct qdisc_dump_args arg; | |
1535 | ||
1536 | if (tc_qdisc_dump_ignore(q) || | |
1537 | *t_p < s_t || !q->ops->cl_ops || | |
1538 | (tcm->tcm_parent && | |
1539 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1540 | (*t_p)++; | |
1541 | return 0; | |
1542 | } | |
1543 | if (*t_p > s_t) | |
1544 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1545 | arg.w.fn = qdisc_class_dump; | |
1546 | arg.skb = skb; | |
1547 | arg.cb = cb; | |
1548 | arg.w.stop = 0; | |
1549 | arg.w.skip = cb->args[1]; | |
1550 | arg.w.count = 0; | |
1551 | q->ops->cl_ops->walk(q, &arg.w); | |
1552 | cb->args[1] = arg.w.count; | |
1553 | if (arg.w.stop) | |
1554 | return -1; | |
1555 | (*t_p)++; | |
1556 | return 0; | |
1557 | } | |
1558 | ||
1559 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1560 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1561 | int *t_p, int s_t) | |
1562 | { | |
1563 | struct Qdisc *q; | |
1564 | ||
1565 | if (!root) | |
1566 | return 0; | |
1567 | ||
1568 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1569 | return -1; | |
1570 | ||
1571 | list_for_each_entry(q, &root->list, list) { | |
1572 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1573 | return -1; | |
1574 | } | |
1575 | ||
1576 | return 0; | |
1577 | } | |
1578 | ||
1da177e4 LT |
1579 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1580 | { | |
30723673 | 1581 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
3b1e0a65 | 1582 | struct net *net = sock_net(skb->sk); |
30723673 | 1583 | struct netdev_queue *dev_queue; |
1da177e4 | 1584 | struct net_device *dev; |
30723673 | 1585 | int t, s_t; |
1da177e4 LT |
1586 | |
1587 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) | |
1588 | return 0; | |
7316ae88 | 1589 | if ((dev = dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1590 | return 0; |
1591 | ||
1592 | s_t = cb->args[0]; | |
1593 | t = 0; | |
1594 | ||
af356afa | 1595 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1596 | goto done; |
1597 | ||
1598 | dev_queue = &dev->rx_queue; | |
8123b421 | 1599 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 | 1600 | goto done; |
1da177e4 | 1601 | |
30723673 | 1602 | done: |
1da177e4 LT |
1603 | cb->args[0] = t; |
1604 | ||
1605 | dev_put(dev); | |
1606 | return skb->len; | |
1607 | } | |
1608 | ||
1609 | /* Main classifier routine: scans classifier chain attached | |
1610 | to this qdisc, (optionally) tests for protocol and asks | |
1611 | specific classifiers. | |
1612 | */ | |
73ca4918 PM |
1613 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1614 | struct tcf_result *res) | |
1615 | { | |
1616 | __be16 protocol = skb->protocol; | |
1617 | int err = 0; | |
1618 | ||
1619 | for (; tp; tp = tp->next) { | |
1620 | if ((tp->protocol == protocol || | |
1621 | tp->protocol == htons(ETH_P_ALL)) && | |
1622 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1623 | #ifdef CONFIG_NET_CLS_ACT | |
1624 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1625 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1626 | #endif | |
1627 | return err; | |
1628 | } | |
1629 | } | |
1630 | return -1; | |
1631 | } | |
1632 | EXPORT_SYMBOL(tc_classify_compat); | |
1633 | ||
1da177e4 | 1634 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1635 | struct tcf_result *res) |
1da177e4 LT |
1636 | { |
1637 | int err = 0; | |
73ca4918 | 1638 | __be16 protocol; |
1da177e4 LT |
1639 | #ifdef CONFIG_NET_CLS_ACT |
1640 | struct tcf_proto *otp = tp; | |
1641 | reclassify: | |
1642 | #endif | |
1643 | protocol = skb->protocol; | |
1644 | ||
73ca4918 | 1645 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1646 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1647 | if (err == TC_ACT_RECLASSIFY) { |
1648 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1649 | tp = otp; | |
1650 | ||
1651 | if (verd++ >= MAX_REC_LOOP) { | |
b60b6592 | 1652 | if (net_ratelimit()) |
1653 | printk(KERN_NOTICE | |
1654 | "%s: packet reclassify loop" | |
1655 | " rule prio %u protocol %02x\n", | |
1656 | tp->q->ops->id, | |
1657 | tp->prio & 0xffff, ntohs(tp->protocol)); | |
73ca4918 | 1658 | return TC_ACT_SHOT; |
1da177e4 | 1659 | } |
73ca4918 PM |
1660 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1661 | goto reclassify; | |
1da177e4 | 1662 | } |
73ca4918 PM |
1663 | #endif |
1664 | return err; | |
1da177e4 | 1665 | } |
73ca4918 | 1666 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1667 | |
a48b5a61 PM |
1668 | void tcf_destroy(struct tcf_proto *tp) |
1669 | { | |
1670 | tp->ops->destroy(tp); | |
1671 | module_put(tp->ops->owner); | |
1672 | kfree(tp); | |
1673 | } | |
1674 | ||
ff31ab56 | 1675 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1676 | { |
1677 | struct tcf_proto *tp; | |
1678 | ||
ff31ab56 PM |
1679 | while ((tp = *fl) != NULL) { |
1680 | *fl = tp->next; | |
a48b5a61 PM |
1681 | tcf_destroy(tp); |
1682 | } | |
1683 | } | |
1684 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1685 | ||
1da177e4 LT |
1686 | #ifdef CONFIG_PROC_FS |
1687 | static int psched_show(struct seq_file *seq, void *v) | |
1688 | { | |
3c0cfc13 PM |
1689 | struct timespec ts; |
1690 | ||
1691 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1692 | seq_printf(seq, "%08x %08x %08x %08x\n", |
ca44d6e6 | 1693 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1694 | 1000000, |
3c0cfc13 | 1695 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1696 | |
1697 | return 0; | |
1698 | } | |
1699 | ||
1700 | static int psched_open(struct inode *inode, struct file *file) | |
1701 | { | |
7e5ab157 | 1702 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1703 | } |
1704 | ||
da7071d7 | 1705 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1706 | .owner = THIS_MODULE, |
1707 | .open = psched_open, | |
1708 | .read = seq_read, | |
1709 | .llseek = seq_lseek, | |
1710 | .release = single_release, | |
10297b99 | 1711 | }; |
7316ae88 TG |
1712 | |
1713 | static int __net_init psched_net_init(struct net *net) | |
1714 | { | |
1715 | struct proc_dir_entry *e; | |
1716 | ||
1717 | e = proc_net_fops_create(net, "psched", 0, &psched_fops); | |
1718 | if (e == NULL) | |
1719 | return -ENOMEM; | |
1720 | ||
1721 | return 0; | |
1722 | } | |
1723 | ||
1724 | static void __net_exit psched_net_exit(struct net *net) | |
1725 | { | |
1726 | proc_net_remove(net, "psched"); | |
7316ae88 TG |
1727 | } |
1728 | #else | |
1729 | static int __net_init psched_net_init(struct net *net) | |
1730 | { | |
1731 | return 0; | |
1732 | } | |
1733 | ||
1734 | static void __net_exit psched_net_exit(struct net *net) | |
1735 | { | |
1736 | } | |
1da177e4 LT |
1737 | #endif |
1738 | ||
7316ae88 TG |
1739 | static struct pernet_operations psched_net_ops = { |
1740 | .init = psched_net_init, | |
1741 | .exit = psched_net_exit, | |
1742 | }; | |
1743 | ||
1da177e4 LT |
1744 | static int __init pktsched_init(void) |
1745 | { | |
7316ae88 TG |
1746 | int err; |
1747 | ||
1748 | err = register_pernet_subsys(&psched_net_ops); | |
1749 | if (err) { | |
1750 | printk(KERN_ERR "pktsched_init: " | |
1751 | "cannot initialize per netns operations\n"); | |
1752 | return err; | |
1753 | } | |
1754 | ||
1da177e4 LT |
1755 | register_qdisc(&pfifo_qdisc_ops); |
1756 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1757 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1758 | register_qdisc(&mq_qdisc_ops); |
1da177e4 | 1759 | |
be577ddc TG |
1760 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
1761 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); | |
1762 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); | |
1763 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); | |
1764 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); | |
1765 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); | |
1766 | ||
1da177e4 LT |
1767 | return 0; |
1768 | } | |
1769 | ||
1770 | subsys_initcall(pktsched_init); |