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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> |
1da177e4 | 31 | |
457c4cbc | 32 | #include <net/net_namespace.h> |
b854272b | 33 | #include <net/sock.h> |
dc5fc579 | 34 | #include <net/netlink.h> |
1da177e4 LT |
35 | #include <net/pkt_sched.h> |
36 | ||
7316ae88 TG |
37 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
38 | struct nlmsghdr *n, u32 clid, | |
1da177e4 | 39 | struct Qdisc *old, struct Qdisc *new); |
7316ae88 TG |
40 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
41 | struct nlmsghdr *n, struct Qdisc *q, | |
42 | unsigned long cl, int event); | |
1da177e4 LT |
43 | |
44 | /* | |
45 | ||
46 | Short review. | |
47 | ------------- | |
48 | ||
49 | This file consists of two interrelated parts: | |
50 | ||
51 | 1. queueing disciplines manager frontend. | |
52 | 2. traffic classes manager frontend. | |
53 | ||
54 | Generally, queueing discipline ("qdisc") is a black box, | |
55 | which is able to enqueue packets and to dequeue them (when | |
56 | device is ready to send something) in order and at times | |
57 | determined by algorithm hidden in it. | |
58 | ||
59 | qdisc's are divided to two categories: | |
60 | - "queues", which have no internal structure visible from outside. | |
61 | - "schedulers", which split all the packets to "traffic classes", | |
62 | using "packet classifiers" (look at cls_api.c) | |
63 | ||
64 | In turn, classes may have child qdiscs (as rule, queues) | |
65 | attached to them etc. etc. etc. | |
66 | ||
67 | The goal of the routines in this file is to translate | |
68 | information supplied by user in the form of handles | |
69 | to more intelligible for kernel form, to make some sanity | |
70 | checks and part of work, which is common to all qdiscs | |
71 | and to provide rtnetlink notifications. | |
72 | ||
73 | All real intelligent work is done inside qdisc modules. | |
74 | ||
75 | ||
76 | ||
77 | Every discipline has two major routines: enqueue and dequeue. | |
78 | ||
79 | ---dequeue | |
80 | ||
81 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
82 | but it does not mean that queue is empty, it just means that | |
83 | discipline does not want to send anything this time. | |
84 | Queue is really empty if q->q.qlen == 0. | |
85 | For complicated disciplines with multiple queues q->q is not | |
86 | real packet queue, but however q->q.qlen must be valid. | |
87 | ||
88 | ---enqueue | |
89 | ||
90 | enqueue returns 0, if packet was enqueued successfully. | |
91 | If packet (this one or another one) was dropped, it returns | |
92 | not zero error code. | |
93 | NET_XMIT_DROP - this packet dropped | |
94 | Expected action: do not backoff, but wait until queue will clear. | |
95 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
96 | Expected action: backoff or ignore | |
97 | NET_XMIT_POLICED - dropped by police. | |
98 | Expected action: backoff or error to real-time apps. | |
99 | ||
100 | Auxiliary routines: | |
101 | ||
99c0db26 JP |
102 | ---peek |
103 | ||
104 | like dequeue but without removing a packet from the queue | |
105 | ||
1da177e4 LT |
106 | ---reset |
107 | ||
108 | returns qdisc to initial state: purge all buffers, clear all | |
109 | timers, counters (except for statistics) etc. | |
110 | ||
111 | ---init | |
112 | ||
113 | initializes newly created qdisc. | |
114 | ||
115 | ---destroy | |
116 | ||
117 | destroys resources allocated by init and during lifetime of qdisc. | |
118 | ||
119 | ---change | |
120 | ||
121 | changes qdisc parameters. | |
122 | */ | |
123 | ||
124 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
125 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
126 | ||
127 | ||
128 | /************************************************ | |
129 | * Queueing disciplines manipulation. * | |
130 | ************************************************/ | |
131 | ||
132 | ||
133 | /* The list of all installed queueing disciplines. */ | |
134 | ||
135 | static struct Qdisc_ops *qdisc_base; | |
136 | ||
137 | /* Register/uregister queueing discipline */ | |
138 | ||
139 | int register_qdisc(struct Qdisc_ops *qops) | |
140 | { | |
141 | struct Qdisc_ops *q, **qp; | |
142 | int rc = -EEXIST; | |
143 | ||
144 | write_lock(&qdisc_mod_lock); | |
145 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
146 | if (!strcmp(qops->id, q->id)) | |
147 | goto out; | |
148 | ||
149 | if (qops->enqueue == NULL) | |
150 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 JP |
151 | if (qops->peek == NULL) { |
152 | if (qops->dequeue == NULL) { | |
153 | qops->peek = noop_qdisc_ops.peek; | |
154 | } else { | |
155 | rc = -EINVAL; | |
156 | goto out; | |
157 | } | |
158 | } | |
1da177e4 LT |
159 | if (qops->dequeue == NULL) |
160 | qops->dequeue = noop_qdisc_ops.dequeue; | |
161 | ||
162 | qops->next = NULL; | |
163 | *qp = qops; | |
164 | rc = 0; | |
165 | out: | |
166 | write_unlock(&qdisc_mod_lock); | |
167 | return rc; | |
168 | } | |
62e3ba1b | 169 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
170 | |
171 | int unregister_qdisc(struct Qdisc_ops *qops) | |
172 | { | |
173 | struct Qdisc_ops *q, **qp; | |
174 | int err = -ENOENT; | |
175 | ||
176 | write_lock(&qdisc_mod_lock); | |
177 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) | |
178 | if (q == qops) | |
179 | break; | |
180 | if (q) { | |
181 | *qp = q->next; | |
182 | q->next = NULL; | |
183 | err = 0; | |
184 | } | |
185 | write_unlock(&qdisc_mod_lock); | |
186 | return err; | |
187 | } | |
62e3ba1b | 188 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 LT |
189 | |
190 | /* We know handle. Find qdisc among all qdisc's attached to device | |
191 | (root qdisc, all its children, children of children etc.) | |
192 | */ | |
193 | ||
6113b748 | 194 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
195 | { |
196 | struct Qdisc *q; | |
197 | ||
198 | if (!(root->flags & TCQ_F_BUILTIN) && | |
199 | root->handle == handle) | |
200 | return root; | |
201 | ||
202 | list_for_each_entry(q, &root->list, list) { | |
203 | if (q->handle == handle) | |
204 | return q; | |
205 | } | |
206 | return NULL; | |
207 | } | |
208 | ||
f6e0b239 JP |
209 | static void qdisc_list_add(struct Qdisc *q) |
210 | { | |
f6486d40 | 211 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
af356afa | 212 | list_add_tail(&q->list, &qdisc_dev(q)->qdisc->list); |
f6e0b239 JP |
213 | } |
214 | ||
215 | void qdisc_list_del(struct Qdisc *q) | |
216 | { | |
f6486d40 | 217 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
f6e0b239 | 218 | list_del(&q->list); |
f6e0b239 JP |
219 | } |
220 | EXPORT_SYMBOL(qdisc_list_del); | |
221 | ||
ead81cc5 | 222 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 223 | { |
f6e0b239 JP |
224 | struct Qdisc *q; |
225 | ||
af356afa PM |
226 | q = qdisc_match_from_root(dev->qdisc, handle); |
227 | if (q) | |
228 | goto out; | |
f6e0b239 JP |
229 | |
230 | q = qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle); | |
f6486d40 | 231 | out: |
f6e0b239 | 232 | return q; |
1da177e4 LT |
233 | } |
234 | ||
235 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
236 | { | |
237 | unsigned long cl; | |
238 | struct Qdisc *leaf; | |
20fea08b | 239 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
240 | |
241 | if (cops == NULL) | |
242 | return NULL; | |
243 | cl = cops->get(p, classid); | |
244 | ||
245 | if (cl == 0) | |
246 | return NULL; | |
247 | leaf = cops->leaf(p, cl); | |
248 | cops->put(p, cl); | |
249 | return leaf; | |
250 | } | |
251 | ||
252 | /* Find queueing discipline by name */ | |
253 | ||
1e90474c | 254 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
255 | { |
256 | struct Qdisc_ops *q = NULL; | |
257 | ||
258 | if (kind) { | |
259 | read_lock(&qdisc_mod_lock); | |
260 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 261 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
262 | if (!try_module_get(q->owner)) |
263 | q = NULL; | |
264 | break; | |
265 | } | |
266 | } | |
267 | read_unlock(&qdisc_mod_lock); | |
268 | } | |
269 | return q; | |
270 | } | |
271 | ||
272 | static struct qdisc_rate_table *qdisc_rtab_list; | |
273 | ||
1e90474c | 274 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
275 | { |
276 | struct qdisc_rate_table *rtab; | |
277 | ||
278 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
279 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
280 | rtab->refcnt++; | |
281 | return rtab; | |
282 | } | |
283 | } | |
284 | ||
5feb5e1a PM |
285 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
286 | nla_len(tab) != TC_RTAB_SIZE) | |
1da177e4 LT |
287 | return NULL; |
288 | ||
289 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
290 | if (rtab) { | |
291 | rtab->rate = *r; | |
292 | rtab->refcnt = 1; | |
1e90474c | 293 | memcpy(rtab->data, nla_data(tab), 1024); |
1da177e4 LT |
294 | rtab->next = qdisc_rtab_list; |
295 | qdisc_rtab_list = rtab; | |
296 | } | |
297 | return rtab; | |
298 | } | |
62e3ba1b | 299 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
300 | |
301 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
302 | { | |
303 | struct qdisc_rate_table *rtab, **rtabp; | |
304 | ||
305 | if (!tab || --tab->refcnt) | |
306 | return; | |
307 | ||
308 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
309 | if (rtab == tab) { | |
310 | *rtabp = rtab->next; | |
311 | kfree(rtab); | |
312 | return; | |
313 | } | |
314 | } | |
315 | } | |
62e3ba1b | 316 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 317 | |
175f9c1b JK |
318 | static LIST_HEAD(qdisc_stab_list); |
319 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
320 | ||
321 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
322 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
323 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
324 | }; | |
325 | ||
326 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
327 | { | |
328 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
329 | struct qdisc_size_table *stab; | |
330 | struct tc_sizespec *s; | |
331 | unsigned int tsize = 0; | |
332 | u16 *tab = NULL; | |
333 | int err; | |
334 | ||
335 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
336 | if (err < 0) | |
337 | return ERR_PTR(err); | |
338 | if (!tb[TCA_STAB_BASE]) | |
339 | return ERR_PTR(-EINVAL); | |
340 | ||
341 | s = nla_data(tb[TCA_STAB_BASE]); | |
342 | ||
343 | if (s->tsize > 0) { | |
344 | if (!tb[TCA_STAB_DATA]) | |
345 | return ERR_PTR(-EINVAL); | |
346 | tab = nla_data(tb[TCA_STAB_DATA]); | |
347 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
348 | } | |
349 | ||
350 | if (!s || tsize != s->tsize || (!tab && tsize > 0)) | |
351 | return ERR_PTR(-EINVAL); | |
352 | ||
f3b9605d | 353 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
354 | |
355 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
356 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
357 | continue; | |
358 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
359 | continue; | |
360 | stab->refcnt++; | |
f3b9605d | 361 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
362 | return stab; |
363 | } | |
364 | ||
f3b9605d | 365 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
366 | |
367 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
368 | if (!stab) | |
369 | return ERR_PTR(-ENOMEM); | |
370 | ||
371 | stab->refcnt = 1; | |
372 | stab->szopts = *s; | |
373 | if (tsize > 0) | |
374 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
375 | ||
f3b9605d | 376 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 377 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 378 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
379 | |
380 | return stab; | |
381 | } | |
382 | ||
383 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
384 | { | |
385 | if (!tab) | |
386 | return; | |
387 | ||
f3b9605d | 388 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
389 | |
390 | if (--tab->refcnt == 0) { | |
391 | list_del(&tab->list); | |
392 | kfree(tab); | |
393 | } | |
394 | ||
f3b9605d | 395 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
396 | } |
397 | EXPORT_SYMBOL(qdisc_put_stab); | |
398 | ||
399 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
400 | { | |
401 | struct nlattr *nest; | |
402 | ||
403 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
404 | if (nest == NULL) |
405 | goto nla_put_failure; | |
175f9c1b JK |
406 | NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); |
407 | nla_nest_end(skb, nest); | |
408 | ||
409 | return skb->len; | |
410 | ||
411 | nla_put_failure: | |
412 | return -1; | |
413 | } | |
414 | ||
415 | void qdisc_calculate_pkt_len(struct sk_buff *skb, struct qdisc_size_table *stab) | |
416 | { | |
417 | int pkt_len, slot; | |
418 | ||
419 | pkt_len = skb->len + stab->szopts.overhead; | |
420 | if (unlikely(!stab->szopts.tsize)) | |
421 | goto out; | |
422 | ||
423 | slot = pkt_len + stab->szopts.cell_align; | |
424 | if (unlikely(slot < 0)) | |
425 | slot = 0; | |
426 | ||
427 | slot >>= stab->szopts.cell_log; | |
428 | if (likely(slot < stab->szopts.tsize)) | |
429 | pkt_len = stab->data[slot]; | |
430 | else | |
431 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
432 | (slot / stab->szopts.tsize) + | |
433 | stab->data[slot % stab->szopts.tsize]; | |
434 | ||
435 | pkt_len <<= stab->szopts.size_log; | |
436 | out: | |
437 | if (unlikely(pkt_len < 1)) | |
438 | pkt_len = 1; | |
439 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
440 | } | |
441 | EXPORT_SYMBOL(qdisc_calculate_pkt_len); | |
442 | ||
b00355db JP |
443 | void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc) |
444 | { | |
445 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
446 | printk(KERN_WARNING | |
447 | "%s: %s qdisc %X: is non-work-conserving?\n", | |
448 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
449 | qdisc->flags |= TCQ_F_WARN_NONWC; | |
450 | } | |
451 | } | |
452 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
453 | ||
4179477f PM |
454 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
455 | { | |
456 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 457 | timer); |
4179477f PM |
458 | |
459 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
8608db03 | 460 | __netif_schedule(qdisc_root(wd->qdisc)); |
1936502d | 461 | |
4179477f PM |
462 | return HRTIMER_NORESTART; |
463 | } | |
464 | ||
465 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
466 | { | |
2fbd3da3 DM |
467 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
468 | wd->timer.function = qdisc_watchdog; | |
4179477f PM |
469 | wd->qdisc = qdisc; |
470 | } | |
471 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
472 | ||
473 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
474 | { | |
475 | ktime_t time; | |
476 | ||
2540e051 JP |
477 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
478 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
479 | return; | |
480 | ||
4179477f PM |
481 | wd->qdisc->flags |= TCQ_F_THROTTLED; |
482 | time = ktime_set(0, 0); | |
ca44d6e6 | 483 | time = ktime_add_ns(time, PSCHED_TICKS2NS(expires)); |
2fbd3da3 | 484 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); |
4179477f PM |
485 | } |
486 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
487 | ||
488 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
489 | { | |
2fbd3da3 | 490 | hrtimer_cancel(&wd->timer); |
4179477f PM |
491 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; |
492 | } | |
493 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 494 | |
a94f779f | 495 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
496 | { |
497 | unsigned int size = n * sizeof(struct hlist_head), i; | |
498 | struct hlist_head *h; | |
499 | ||
500 | if (size <= PAGE_SIZE) | |
501 | h = kmalloc(size, GFP_KERNEL); | |
502 | else | |
503 | h = (struct hlist_head *) | |
504 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
505 | ||
506 | if (h != NULL) { | |
507 | for (i = 0; i < n; i++) | |
508 | INIT_HLIST_HEAD(&h[i]); | |
509 | } | |
510 | return h; | |
511 | } | |
512 | ||
513 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
514 | { | |
515 | unsigned int size = n * sizeof(struct hlist_head); | |
516 | ||
517 | if (size <= PAGE_SIZE) | |
518 | kfree(h); | |
519 | else | |
520 | free_pages((unsigned long)h, get_order(size)); | |
521 | } | |
522 | ||
523 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
524 | { | |
525 | struct Qdisc_class_common *cl; | |
526 | struct hlist_node *n, *next; | |
527 | struct hlist_head *nhash, *ohash; | |
528 | unsigned int nsize, nmask, osize; | |
529 | unsigned int i, h; | |
530 | ||
531 | /* Rehash when load factor exceeds 0.75 */ | |
532 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
533 | return; | |
534 | nsize = clhash->hashsize * 2; | |
535 | nmask = nsize - 1; | |
536 | nhash = qdisc_class_hash_alloc(nsize); | |
537 | if (nhash == NULL) | |
538 | return; | |
539 | ||
540 | ohash = clhash->hash; | |
541 | osize = clhash->hashsize; | |
542 | ||
543 | sch_tree_lock(sch); | |
544 | for (i = 0; i < osize; i++) { | |
545 | hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) { | |
546 | h = qdisc_class_hash(cl->classid, nmask); | |
547 | hlist_add_head(&cl->hnode, &nhash[h]); | |
548 | } | |
549 | } | |
550 | clhash->hash = nhash; | |
551 | clhash->hashsize = nsize; | |
552 | clhash->hashmask = nmask; | |
553 | sch_tree_unlock(sch); | |
554 | ||
555 | qdisc_class_hash_free(ohash, osize); | |
556 | } | |
557 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
558 | ||
559 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
560 | { | |
561 | unsigned int size = 4; | |
562 | ||
563 | clhash->hash = qdisc_class_hash_alloc(size); | |
564 | if (clhash->hash == NULL) | |
565 | return -ENOMEM; | |
566 | clhash->hashsize = size; | |
567 | clhash->hashmask = size - 1; | |
568 | clhash->hashelems = 0; | |
569 | return 0; | |
570 | } | |
571 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
572 | ||
573 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
574 | { | |
575 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
576 | } | |
577 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
578 | ||
579 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
580 | struct Qdisc_class_common *cl) | |
581 | { | |
582 | unsigned int h; | |
583 | ||
584 | INIT_HLIST_NODE(&cl->hnode); | |
585 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
586 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
587 | clhash->hashelems++; | |
588 | } | |
589 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
590 | ||
591 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
592 | struct Qdisc_class_common *cl) | |
593 | { | |
594 | hlist_del(&cl->hnode); | |
595 | clhash->hashelems--; | |
596 | } | |
597 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
598 | ||
1da177e4 LT |
599 | /* Allocate an unique handle from space managed by kernel */ |
600 | ||
601 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
602 | { | |
603 | int i = 0x10000; | |
604 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
605 | ||
606 | do { | |
607 | autohandle += TC_H_MAKE(0x10000U, 0); | |
608 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
609 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
610 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
611 | ||
612 | return i>0 ? autohandle : 0; | |
613 | } | |
614 | ||
43effa1e PM |
615 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
616 | { | |
20fea08b | 617 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
618 | unsigned long cl; |
619 | u32 parentid; | |
620 | ||
621 | if (n == 0) | |
622 | return; | |
623 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
624 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
625 | return; | |
626 | ||
5ce2d488 | 627 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
628 | if (sch == NULL) { |
629 | WARN_ON(parentid != TC_H_ROOT); | |
630 | return; | |
631 | } | |
43effa1e PM |
632 | cops = sch->ops->cl_ops; |
633 | if (cops->qlen_notify) { | |
634 | cl = cops->get(sch, parentid); | |
635 | cops->qlen_notify(sch, cl); | |
636 | cops->put(sch, cl); | |
637 | } | |
638 | sch->q.qlen -= n; | |
639 | } | |
640 | } | |
641 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 642 | |
7316ae88 TG |
643 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
644 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
645 | struct Qdisc *old, struct Qdisc *new) |
646 | { | |
647 | if (new || old) | |
7316ae88 | 648 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 649 | |
4d8863a2 | 650 | if (old) |
99194cff | 651 | qdisc_destroy(old); |
99194cff DM |
652 | } |
653 | ||
654 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
655 | * to device "dev". | |
656 | * | |
657 | * When appropriate send a netlink notification using 'skb' | |
658 | * and "n". | |
659 | * | |
660 | * On success, destroy old qdisc. | |
1da177e4 LT |
661 | */ |
662 | ||
663 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
664 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
665 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 666 | { |
99194cff | 667 | struct Qdisc *q = old; |
7316ae88 | 668 | struct net *net = dev_net(dev); |
1da177e4 | 669 | int err = 0; |
1da177e4 | 670 | |
10297b99 | 671 | if (parent == NULL) { |
99194cff DM |
672 | unsigned int i, num_q, ingress; |
673 | ||
674 | ingress = 0; | |
675 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
676 | if ((q && q->flags & TCQ_F_INGRESS) || |
677 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
678 | num_q = 1; |
679 | ingress = 1; | |
680 | } | |
681 | ||
682 | if (dev->flags & IFF_UP) | |
683 | dev_deactivate(dev); | |
684 | ||
6ec1c69a DM |
685 | if (new && new->ops->attach) { |
686 | new->ops->attach(new); | |
687 | num_q = 0; | |
688 | } | |
689 | ||
99194cff DM |
690 | for (i = 0; i < num_q; i++) { |
691 | struct netdev_queue *dev_queue = &dev->rx_queue; | |
692 | ||
693 | if (!ingress) | |
694 | dev_queue = netdev_get_tx_queue(dev, i); | |
695 | ||
8d50b53d DM |
696 | old = dev_graft_qdisc(dev_queue, new); |
697 | if (new && i > 0) | |
698 | atomic_inc(&new->refcnt); | |
699 | ||
036d6a67 JP |
700 | if (!ingress) |
701 | qdisc_destroy(old); | |
1da177e4 | 702 | } |
99194cff | 703 | |
036d6a67 | 704 | if (!ingress) { |
7316ae88 TG |
705 | notify_and_destroy(net, skb, n, classid, |
706 | dev->qdisc, new); | |
036d6a67 JP |
707 | if (new && !new->ops->attach) |
708 | atomic_inc(&new->refcnt); | |
709 | dev->qdisc = new ? : &noop_qdisc; | |
710 | } else { | |
7316ae88 | 711 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 712 | } |
af356afa | 713 | |
99194cff DM |
714 | if (dev->flags & IFF_UP) |
715 | dev_activate(dev); | |
1da177e4 | 716 | } else { |
20fea08b | 717 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 718 | |
c9f1d038 PM |
719 | err = -EOPNOTSUPP; |
720 | if (cops && cops->graft) { | |
1da177e4 LT |
721 | unsigned long cl = cops->get(parent, classid); |
722 | if (cl) { | |
99194cff | 723 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 724 | cops->put(parent, cl); |
c9f1d038 PM |
725 | } else |
726 | err = -ENOENT; | |
1da177e4 | 727 | } |
99194cff | 728 | if (!err) |
7316ae88 | 729 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
730 | } |
731 | return err; | |
732 | } | |
733 | ||
25bfcd5a JP |
734 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
735 | static struct lock_class_key qdisc_tx_lock; | |
736 | static struct lock_class_key qdisc_rx_lock; | |
737 | ||
1da177e4 LT |
738 | /* |
739 | Allocate and initialize new qdisc. | |
740 | ||
741 | Parameters are passed via opt. | |
742 | */ | |
743 | ||
744 | static struct Qdisc * | |
bb949fbd | 745 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
23bcf634 PM |
746 | struct Qdisc *p, u32 parent, u32 handle, |
747 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
748 | { |
749 | int err; | |
1e90474c | 750 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
751 | struct Qdisc *sch; |
752 | struct Qdisc_ops *ops; | |
175f9c1b | 753 | struct qdisc_size_table *stab; |
1da177e4 LT |
754 | |
755 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 756 | #ifdef CONFIG_MODULES |
1da177e4 LT |
757 | if (ops == NULL && kind != NULL) { |
758 | char name[IFNAMSIZ]; | |
1e90474c | 759 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
760 | /* We dropped the RTNL semaphore in order to |
761 | * perform the module load. So, even if we | |
762 | * succeeded in loading the module we have to | |
763 | * tell the caller to replay the request. We | |
764 | * indicate this using -EAGAIN. | |
765 | * We replay the request because the device may | |
766 | * go away in the mean time. | |
767 | */ | |
768 | rtnl_unlock(); | |
769 | request_module("sch_%s", name); | |
770 | rtnl_lock(); | |
771 | ops = qdisc_lookup_ops(kind); | |
772 | if (ops != NULL) { | |
773 | /* We will try again qdisc_lookup_ops, | |
774 | * so don't keep a reference. | |
775 | */ | |
776 | module_put(ops->owner); | |
777 | err = -EAGAIN; | |
778 | goto err_out; | |
779 | } | |
780 | } | |
781 | } | |
782 | #endif | |
783 | ||
b9e2cc0f | 784 | err = -ENOENT; |
1da177e4 LT |
785 | if (ops == NULL) |
786 | goto err_out; | |
787 | ||
5ce2d488 | 788 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
789 | if (IS_ERR(sch)) { |
790 | err = PTR_ERR(sch); | |
1da177e4 | 791 | goto err_out2; |
3d54b82f | 792 | } |
1da177e4 | 793 | |
ffc8fefa PM |
794 | sch->parent = parent; |
795 | ||
3d54b82f | 796 | if (handle == TC_H_INGRESS) { |
1da177e4 | 797 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 798 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 799 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 800 | } else { |
fd44de7c PM |
801 | if (handle == 0) { |
802 | handle = qdisc_alloc_handle(dev); | |
803 | err = -ENOMEM; | |
804 | if (handle == 0) | |
805 | goto err_out3; | |
806 | } | |
25bfcd5a | 807 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1da177e4 LT |
808 | } |
809 | ||
3d54b82f | 810 | sch->handle = handle; |
1da177e4 | 811 | |
1e90474c | 812 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
813 | if (tca[TCA_STAB]) { |
814 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
815 | if (IS_ERR(stab)) { | |
816 | err = PTR_ERR(stab); | |
7c64b9f3 | 817 | goto err_out4; |
175f9c1b JK |
818 | } |
819 | sch->stab = stab; | |
820 | } | |
1e90474c | 821 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
822 | spinlock_t *root_lock; |
823 | ||
23bcf634 PM |
824 | err = -EOPNOTSUPP; |
825 | if (sch->flags & TCQ_F_MQROOT) | |
826 | goto err_out4; | |
827 | ||
f6f9b93f | 828 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
829 | !(sch->flags & TCQ_F_INGRESS) && |
830 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
f6f9b93f JP |
831 | root_lock = qdisc_root_sleeping_lock(sch); |
832 | else | |
833 | root_lock = qdisc_lock(sch); | |
834 | ||
023e09a7 | 835 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f | 836 | root_lock, tca[TCA_RATE]); |
23bcf634 PM |
837 | if (err) |
838 | goto err_out4; | |
023e09a7 | 839 | } |
f6e0b239 JP |
840 | |
841 | qdisc_list_add(sch); | |
1da177e4 | 842 | |
1da177e4 LT |
843 | return sch; |
844 | } | |
845 | err_out3: | |
846 | dev_put(dev); | |
3d54b82f | 847 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
848 | err_out2: |
849 | module_put(ops->owner); | |
850 | err_out: | |
851 | *errp = err; | |
1da177e4 | 852 | return NULL; |
23bcf634 PM |
853 | |
854 | err_out4: | |
855 | /* | |
856 | * Any broken qdiscs that would require a ops->reset() here? | |
857 | * The qdisc was never in action so it shouldn't be necessary. | |
858 | */ | |
7c64b9f3 | 859 | qdisc_put_stab(sch->stab); |
23bcf634 PM |
860 | if (ops->destroy) |
861 | ops->destroy(sch); | |
862 | goto err_out3; | |
1da177e4 LT |
863 | } |
864 | ||
1e90474c | 865 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 866 | { |
175f9c1b JK |
867 | struct qdisc_size_table *stab = NULL; |
868 | int err = 0; | |
1da177e4 | 869 | |
175f9c1b | 870 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
871 | if (sch->ops->change == NULL) |
872 | return -EINVAL; | |
1e90474c | 873 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
874 | if (err) |
875 | return err; | |
876 | } | |
175f9c1b JK |
877 | |
878 | if (tca[TCA_STAB]) { | |
879 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
880 | if (IS_ERR(stab)) | |
881 | return PTR_ERR(stab); | |
882 | } | |
883 | ||
884 | qdisc_put_stab(sch->stab); | |
885 | sch->stab = stab; | |
886 | ||
23bcf634 | 887 | if (tca[TCA_RATE]) { |
71bcb09a SH |
888 | /* NB: ignores errors from replace_estimator |
889 | because change can't be undone. */ | |
23bcf634 PM |
890 | if (sch->flags & TCQ_F_MQROOT) |
891 | goto out; | |
1da177e4 | 892 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
71bcb09a SH |
893 | qdisc_root_sleeping_lock(sch), |
894 | tca[TCA_RATE]); | |
23bcf634 PM |
895 | } |
896 | out: | |
1da177e4 LT |
897 | return 0; |
898 | } | |
899 | ||
900 | struct check_loop_arg | |
901 | { | |
902 | struct qdisc_walker w; | |
903 | struct Qdisc *p; | |
904 | int depth; | |
905 | }; | |
906 | ||
907 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
908 | ||
909 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
910 | { | |
911 | struct check_loop_arg arg; | |
912 | ||
913 | if (q->ops->cl_ops == NULL) | |
914 | return 0; | |
915 | ||
916 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
917 | arg.w.fn = check_loop_fn; | |
918 | arg.depth = depth; | |
919 | arg.p = p; | |
920 | q->ops->cl_ops->walk(q, &arg.w); | |
921 | return arg.w.stop ? -ELOOP : 0; | |
922 | } | |
923 | ||
924 | static int | |
925 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
926 | { | |
927 | struct Qdisc *leaf; | |
20fea08b | 928 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
929 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
930 | ||
931 | leaf = cops->leaf(q, cl); | |
932 | if (leaf) { | |
933 | if (leaf == arg->p || arg->depth > 7) | |
934 | return -ELOOP; | |
935 | return check_loop(leaf, arg->p, arg->depth + 1); | |
936 | } | |
937 | return 0; | |
938 | } | |
939 | ||
940 | /* | |
941 | * Delete/get qdisc. | |
942 | */ | |
943 | ||
944 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
945 | { | |
3b1e0a65 | 946 | struct net *net = sock_net(skb->sk); |
1da177e4 | 947 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 948 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
949 | struct net_device *dev; |
950 | u32 clid = tcm->tcm_parent; | |
951 | struct Qdisc *q = NULL; | |
952 | struct Qdisc *p = NULL; | |
953 | int err; | |
954 | ||
7316ae88 | 955 | if ((dev = __dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
956 | return -ENODEV; |
957 | ||
1e90474c PM |
958 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
959 | if (err < 0) | |
960 | return err; | |
961 | ||
1da177e4 LT |
962 | if (clid) { |
963 | if (clid != TC_H_ROOT) { | |
964 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
965 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
966 | return -ENOENT; | |
967 | q = qdisc_leaf(p, clid); | |
968 | } else { /* ingress */ | |
8123b421 | 969 | q = dev->rx_queue.qdisc_sleeping; |
10297b99 | 970 | } |
1da177e4 | 971 | } else { |
af356afa | 972 | q = dev->qdisc; |
1da177e4 LT |
973 | } |
974 | if (!q) | |
975 | return -ENOENT; | |
976 | ||
977 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
978 | return -EINVAL; | |
979 | } else { | |
980 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
981 | return -ENOENT; | |
982 | } | |
983 | ||
1e90474c | 984 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
985 | return -EINVAL; |
986 | ||
987 | if (n->nlmsg_type == RTM_DELQDISC) { | |
988 | if (!clid) | |
989 | return -EINVAL; | |
990 | if (q->handle == 0) | |
991 | return -ENOENT; | |
99194cff | 992 | if ((err = qdisc_graft(dev, p, skb, n, clid, NULL, q)) != 0) |
1da177e4 | 993 | return err; |
1da177e4 | 994 | } else { |
7316ae88 | 995 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
996 | } |
997 | return 0; | |
998 | } | |
999 | ||
1000 | /* | |
1001 | Create/change qdisc. | |
1002 | */ | |
1003 | ||
1004 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1005 | { | |
3b1e0a65 | 1006 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1007 | struct tcmsg *tcm; |
1e90474c | 1008 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1009 | struct net_device *dev; |
1010 | u32 clid; | |
1011 | struct Qdisc *q, *p; | |
1012 | int err; | |
1013 | ||
1014 | replay: | |
1015 | /* Reinit, just in case something touches this. */ | |
1016 | tcm = NLMSG_DATA(n); | |
1da177e4 LT |
1017 | clid = tcm->tcm_parent; |
1018 | q = p = NULL; | |
1019 | ||
7316ae88 | 1020 | if ((dev = __dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1021 | return -ENODEV; |
1022 | ||
1e90474c PM |
1023 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1024 | if (err < 0) | |
1025 | return err; | |
1026 | ||
1da177e4 LT |
1027 | if (clid) { |
1028 | if (clid != TC_H_ROOT) { | |
1029 | if (clid != TC_H_INGRESS) { | |
1030 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
1031 | return -ENOENT; | |
1032 | q = qdisc_leaf(p, clid); | |
1033 | } else { /*ingress */ | |
8123b421 | 1034 | q = dev->rx_queue.qdisc_sleeping; |
1da177e4 LT |
1035 | } |
1036 | } else { | |
af356afa | 1037 | q = dev->qdisc; |
1da177e4 LT |
1038 | } |
1039 | ||
1040 | /* It may be default qdisc, ignore it */ | |
1041 | if (q && q->handle == 0) | |
1042 | q = NULL; | |
1043 | ||
1044 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1045 | if (tcm->tcm_handle) { | |
1046 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
1047 | return -EEXIST; | |
1048 | if (TC_H_MIN(tcm->tcm_handle)) | |
1049 | return -EINVAL; | |
1050 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
1051 | goto create_n_graft; | |
1052 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1053 | return -EEXIST; | |
1e90474c | 1054 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1055 | return -EINVAL; |
1056 | if (q == p || | |
1057 | (p && check_loop(q, p, 0))) | |
1058 | return -ELOOP; | |
1059 | atomic_inc(&q->refcnt); | |
1060 | goto graft; | |
1061 | } else { | |
1062 | if (q == NULL) | |
1063 | goto create_n_graft; | |
1064 | ||
1065 | /* This magic test requires explanation. | |
1066 | * | |
1067 | * We know, that some child q is already | |
1068 | * attached to this parent and have choice: | |
1069 | * either to change it or to create/graft new one. | |
1070 | * | |
1071 | * 1. We are allowed to create/graft only | |
1072 | * if CREATE and REPLACE flags are set. | |
1073 | * | |
1074 | * 2. If EXCL is set, requestor wanted to say, | |
1075 | * that qdisc tcm_handle is not expected | |
1076 | * to exist, so that we choose create/graft too. | |
1077 | * | |
1078 | * 3. The last case is when no flags are set. | |
1079 | * Alas, it is sort of hole in API, we | |
1080 | * cannot decide what to do unambiguously. | |
1081 | * For now we select create/graft, if | |
1082 | * user gave KIND, which does not match existing. | |
1083 | */ | |
1084 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
1085 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
1086 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
1e90474c PM |
1087 | (tca[TCA_KIND] && |
1088 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1089 | goto create_n_graft; |
1090 | } | |
1091 | } | |
1092 | } else { | |
1093 | if (!tcm->tcm_handle) | |
1094 | return -EINVAL; | |
1095 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1096 | } | |
1097 | ||
1098 | /* Change qdisc parameters */ | |
1099 | if (q == NULL) | |
1100 | return -ENOENT; | |
1101 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1102 | return -EEXIST; | |
1e90474c | 1103 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1104 | return -EINVAL; |
1105 | err = qdisc_change(q, tca); | |
1106 | if (err == 0) | |
7316ae88 | 1107 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1108 | return err; |
1109 | ||
1110 | create_n_graft: | |
1111 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
1112 | return -ENOENT; | |
1113 | if (clid == TC_H_INGRESS) | |
23bcf634 | 1114 | q = qdisc_create(dev, &dev->rx_queue, p, |
bb949fbd | 1115 | tcm->tcm_parent, tcm->tcm_parent, |
ffc8fefa | 1116 | tca, &err); |
6ec1c69a | 1117 | else { |
926e61b7 | 1118 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1119 | |
1120 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1121 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1122 | else if (p) | |
1123 | dev_queue = p->dev_queue; | |
1124 | else | |
1125 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1126 | |
926e61b7 | 1127 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1128 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1129 | tca, &err); |
6ec1c69a | 1130 | } |
1da177e4 LT |
1131 | if (q == NULL) { |
1132 | if (err == -EAGAIN) | |
1133 | goto replay; | |
1134 | return err; | |
1135 | } | |
1136 | ||
1137 | graft: | |
e5befbd9 IJ |
1138 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1139 | if (err) { | |
1140 | if (q) | |
1141 | qdisc_destroy(q); | |
1142 | return err; | |
1da177e4 | 1143 | } |
e5befbd9 | 1144 | |
1da177e4 LT |
1145 | return 0; |
1146 | } | |
1147 | ||
1148 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 1149 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1150 | { |
1151 | struct tcmsg *tcm; | |
1152 | struct nlmsghdr *nlh; | |
27a884dc | 1153 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1154 | struct gnet_dump d; |
1155 | ||
e431b8c0 | 1156 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1157 | tcm = NLMSG_DATA(nlh); |
1158 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1159 | tcm->tcm__pad1 = 0; |
1160 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1161 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1162 | tcm->tcm_parent = clid; |
1163 | tcm->tcm_handle = q->handle; | |
1164 | tcm->tcm_info = atomic_read(&q->refcnt); | |
57e1c487 | 1165 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1166 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1167 | goto nla_put_failure; |
1da177e4 LT |
1168 | q->qstats.qlen = q->q.qlen; |
1169 | ||
175f9c1b JK |
1170 | if (q->stab && qdisc_dump_stab(skb, q->stab) < 0) |
1171 | goto nla_put_failure; | |
1172 | ||
102396ae JP |
1173 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1174 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1175 | goto nla_put_failure; |
1da177e4 LT |
1176 | |
1177 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1178 | goto nla_put_failure; |
1da177e4 LT |
1179 | |
1180 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
d250a5f9 | 1181 | gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || |
1da177e4 | 1182 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1183 | goto nla_put_failure; |
10297b99 | 1184 | |
1da177e4 | 1185 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1186 | goto nla_put_failure; |
10297b99 | 1187 | |
27a884dc | 1188 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1189 | return skb->len; |
1190 | ||
1191 | nlmsg_failure: | |
1e90474c | 1192 | nla_put_failure: |
dc5fc579 | 1193 | nlmsg_trim(skb, b); |
1da177e4 LT |
1194 | return -1; |
1195 | } | |
1196 | ||
7316ae88 TG |
1197 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1198 | struct nlmsghdr *n, u32 clid, | |
1199 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1200 | { |
1201 | struct sk_buff *skb; | |
1202 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1203 | ||
1204 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1205 | if (!skb) | |
1206 | return -ENOBUFS; | |
1207 | ||
1208 | if (old && old->handle) { | |
1209 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) | |
1210 | goto err_out; | |
1211 | } | |
1212 | if (new) { | |
1213 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
1214 | goto err_out; | |
1215 | } | |
1216 | ||
1217 | if (skb->len) | |
7316ae88 | 1218 | return rtnetlink_send(skb, net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1219 | |
1220 | err_out: | |
1221 | kfree_skb(skb); | |
1222 | return -EINVAL; | |
1223 | } | |
1224 | ||
30723673 DM |
1225 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1226 | { | |
1227 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1228 | } | |
1229 | ||
1230 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, | |
1231 | struct netlink_callback *cb, | |
1232 | int *q_idx_p, int s_q_idx) | |
1233 | { | |
1234 | int ret = 0, q_idx = *q_idx_p; | |
1235 | struct Qdisc *q; | |
1236 | ||
1237 | if (!root) | |
1238 | return 0; | |
1239 | ||
1240 | q = root; | |
1241 | if (q_idx < s_q_idx) { | |
1242 | q_idx++; | |
1243 | } else { | |
1244 | if (!tc_qdisc_dump_ignore(q) && | |
1245 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1246 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1247 | goto done; | |
1248 | q_idx++; | |
1249 | } | |
1250 | list_for_each_entry(q, &root->list, list) { | |
1251 | if (q_idx < s_q_idx) { | |
1252 | q_idx++; | |
1253 | continue; | |
1254 | } | |
1255 | if (!tc_qdisc_dump_ignore(q) && | |
1256 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1257 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1258 | goto done; | |
1259 | q_idx++; | |
1260 | } | |
1261 | ||
1262 | out: | |
1263 | *q_idx_p = q_idx; | |
1264 | return ret; | |
1265 | done: | |
1266 | ret = -1; | |
1267 | goto out; | |
1268 | } | |
1269 | ||
1da177e4 LT |
1270 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1271 | { | |
3b1e0a65 | 1272 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1273 | int idx, q_idx; |
1274 | int s_idx, s_q_idx; | |
1275 | struct net_device *dev; | |
1da177e4 LT |
1276 | |
1277 | s_idx = cb->args[0]; | |
1278 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1279 | |
1280 | rcu_read_lock(); | |
7562f876 | 1281 | idx = 0; |
7316ae88 | 1282 | for_each_netdev_rcu(net, dev) { |
30723673 DM |
1283 | struct netdev_queue *dev_queue; |
1284 | ||
1da177e4 | 1285 | if (idx < s_idx) |
7562f876 | 1286 | goto cont; |
1da177e4 LT |
1287 | if (idx > s_idx) |
1288 | s_q_idx = 0; | |
1da177e4 | 1289 | q_idx = 0; |
30723673 | 1290 | |
af356afa | 1291 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1292 | goto done; |
1293 | ||
1294 | dev_queue = &dev->rx_queue; | |
827ebd64 | 1295 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1296 | goto done; |
1297 | ||
7562f876 PE |
1298 | cont: |
1299 | idx++; | |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | done: | |
f1e9016d | 1303 | rcu_read_unlock(); |
1da177e4 LT |
1304 | |
1305 | cb->args[0] = idx; | |
1306 | cb->args[1] = q_idx; | |
1307 | ||
1308 | return skb->len; | |
1309 | } | |
1310 | ||
1311 | ||
1312 | ||
1313 | /************************************************ | |
1314 | * Traffic classes manipulation. * | |
1315 | ************************************************/ | |
1316 | ||
1317 | ||
1318 | ||
1319 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1320 | { | |
3b1e0a65 | 1321 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1322 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 1323 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1324 | struct net_device *dev; |
1325 | struct Qdisc *q = NULL; | |
20fea08b | 1326 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1327 | unsigned long cl = 0; |
1328 | unsigned long new_cl; | |
1329 | u32 pid = tcm->tcm_parent; | |
1330 | u32 clid = tcm->tcm_handle; | |
1331 | u32 qid = TC_H_MAJ(clid); | |
1332 | int err; | |
1333 | ||
7316ae88 | 1334 | if ((dev = __dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1335 | return -ENODEV; |
1336 | ||
1e90474c PM |
1337 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1338 | if (err < 0) | |
1339 | return err; | |
1340 | ||
1da177e4 LT |
1341 | /* |
1342 | parent == TC_H_UNSPEC - unspecified parent. | |
1343 | parent == TC_H_ROOT - class is root, which has no parent. | |
1344 | parent == X:0 - parent is root class. | |
1345 | parent == X:Y - parent is a node in hierarchy. | |
1346 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1347 | ||
1348 | handle == 0:0 - generate handle from kernel pool. | |
1349 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1350 | handle == X:Y - clear. | |
1351 | handle == X:0 - root class. | |
1352 | */ | |
1353 | ||
1354 | /* Step 1. Determine qdisc handle X:0 */ | |
1355 | ||
1356 | if (pid != TC_H_ROOT) { | |
1357 | u32 qid1 = TC_H_MAJ(pid); | |
1358 | ||
1359 | if (qid && qid1) { | |
1360 | /* If both majors are known, they must be identical. */ | |
1361 | if (qid != qid1) | |
1362 | return -EINVAL; | |
1363 | } else if (qid1) { | |
1364 | qid = qid1; | |
1365 | } else if (qid == 0) | |
af356afa | 1366 | qid = dev->qdisc->handle; |
1da177e4 LT |
1367 | |
1368 | /* Now qid is genuine qdisc handle consistent | |
1369 | both with parent and child. | |
1370 | ||
1371 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
1372 | */ | |
1373 | if (pid) | |
1374 | pid = TC_H_MAKE(qid, pid); | |
1375 | } else { | |
1376 | if (qid == 0) | |
af356afa | 1377 | qid = dev->qdisc->handle; |
1da177e4 LT |
1378 | } |
1379 | ||
1380 | /* OK. Locate qdisc */ | |
10297b99 | 1381 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
1da177e4 LT |
1382 | return -ENOENT; |
1383 | ||
1384 | /* An check that it supports classes */ | |
1385 | cops = q->ops->cl_ops; | |
1386 | if (cops == NULL) | |
1387 | return -EINVAL; | |
1388 | ||
1389 | /* Now try to get class */ | |
1390 | if (clid == 0) { | |
1391 | if (pid == TC_H_ROOT) | |
1392 | clid = qid; | |
1393 | } else | |
1394 | clid = TC_H_MAKE(qid, clid); | |
1395 | ||
1396 | if (clid) | |
1397 | cl = cops->get(q, clid); | |
1398 | ||
1399 | if (cl == 0) { | |
1400 | err = -ENOENT; | |
1401 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
1402 | goto out; | |
1403 | } else { | |
1404 | switch (n->nlmsg_type) { | |
10297b99 | 1405 | case RTM_NEWTCLASS: |
1da177e4 LT |
1406 | err = -EEXIST; |
1407 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1408 | goto out; | |
1409 | break; | |
1410 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1411 | err = -EOPNOTSUPP; |
1412 | if (cops->delete) | |
1413 | err = cops->delete(q, cl); | |
1da177e4 | 1414 | if (err == 0) |
7316ae88 | 1415 | tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); |
1da177e4 LT |
1416 | goto out; |
1417 | case RTM_GETTCLASS: | |
7316ae88 | 1418 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1419 | goto out; |
1420 | default: | |
1421 | err = -EINVAL; | |
1422 | goto out; | |
1423 | } | |
1424 | } | |
1425 | ||
1426 | new_cl = cl; | |
de6d5cdf PM |
1427 | err = -EOPNOTSUPP; |
1428 | if (cops->change) | |
1429 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1da177e4 | 1430 | if (err == 0) |
7316ae88 | 1431 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1432 | |
1433 | out: | |
1434 | if (cl) | |
1435 | cops->put(q, cl); | |
1436 | ||
1437 | return err; | |
1438 | } | |
1439 | ||
1440 | ||
1441 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1442 | unsigned long cl, | |
e431b8c0 | 1443 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1444 | { |
1445 | struct tcmsg *tcm; | |
1446 | struct nlmsghdr *nlh; | |
27a884dc | 1447 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1448 | struct gnet_dump d; |
20fea08b | 1449 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1450 | |
e431b8c0 | 1451 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1452 | tcm = NLMSG_DATA(nlh); |
1453 | tcm->tcm_family = AF_UNSPEC; | |
16ebb5e0 ED |
1454 | tcm->tcm__pad1 = 0; |
1455 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1456 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1457 | tcm->tcm_parent = q->handle; |
1458 | tcm->tcm_handle = q->handle; | |
1459 | tcm->tcm_info = 0; | |
57e1c487 | 1460 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1461 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1462 | goto nla_put_failure; |
1da177e4 | 1463 | |
102396ae JP |
1464 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1465 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1466 | goto nla_put_failure; |
1da177e4 LT |
1467 | |
1468 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1469 | goto nla_put_failure; |
1da177e4 LT |
1470 | |
1471 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1472 | goto nla_put_failure; |
1da177e4 | 1473 | |
27a884dc | 1474 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1475 | return skb->len; |
1476 | ||
1477 | nlmsg_failure: | |
1e90474c | 1478 | nla_put_failure: |
dc5fc579 | 1479 | nlmsg_trim(skb, b); |
1da177e4 LT |
1480 | return -1; |
1481 | } | |
1482 | ||
7316ae88 TG |
1483 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1484 | struct nlmsghdr *n, struct Qdisc *q, | |
1485 | unsigned long cl, int event) | |
1da177e4 LT |
1486 | { |
1487 | struct sk_buff *skb; | |
1488 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1489 | ||
1490 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1491 | if (!skb) | |
1492 | return -ENOBUFS; | |
1493 | ||
1494 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1495 | kfree_skb(skb); | |
1496 | return -EINVAL; | |
1497 | } | |
1498 | ||
7316ae88 | 1499 | return rtnetlink_send(skb, net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1500 | } |
1501 | ||
1502 | struct qdisc_dump_args | |
1503 | { | |
1504 | struct qdisc_walker w; | |
1505 | struct sk_buff *skb; | |
1506 | struct netlink_callback *cb; | |
1507 | }; | |
1508 | ||
1509 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1510 | { | |
1511 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1512 | ||
1513 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1514 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1515 | } | |
1516 | ||
30723673 DM |
1517 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1518 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1519 | int *t_p, int s_t) | |
1520 | { | |
1521 | struct qdisc_dump_args arg; | |
1522 | ||
1523 | if (tc_qdisc_dump_ignore(q) || | |
1524 | *t_p < s_t || !q->ops->cl_ops || | |
1525 | (tcm->tcm_parent && | |
1526 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1527 | (*t_p)++; | |
1528 | return 0; | |
1529 | } | |
1530 | if (*t_p > s_t) | |
1531 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1532 | arg.w.fn = qdisc_class_dump; | |
1533 | arg.skb = skb; | |
1534 | arg.cb = cb; | |
1535 | arg.w.stop = 0; | |
1536 | arg.w.skip = cb->args[1]; | |
1537 | arg.w.count = 0; | |
1538 | q->ops->cl_ops->walk(q, &arg.w); | |
1539 | cb->args[1] = arg.w.count; | |
1540 | if (arg.w.stop) | |
1541 | return -1; | |
1542 | (*t_p)++; | |
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1547 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1548 | int *t_p, int s_t) | |
1549 | { | |
1550 | struct Qdisc *q; | |
1551 | ||
1552 | if (!root) | |
1553 | return 0; | |
1554 | ||
1555 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1556 | return -1; | |
1557 | ||
1558 | list_for_each_entry(q, &root->list, list) { | |
1559 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1560 | return -1; | |
1561 | } | |
1562 | ||
1563 | return 0; | |
1564 | } | |
1565 | ||
1da177e4 LT |
1566 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1567 | { | |
30723673 | 1568 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
3b1e0a65 | 1569 | struct net *net = sock_net(skb->sk); |
30723673 | 1570 | struct netdev_queue *dev_queue; |
1da177e4 | 1571 | struct net_device *dev; |
30723673 | 1572 | int t, s_t; |
1da177e4 LT |
1573 | |
1574 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) | |
1575 | return 0; | |
7316ae88 | 1576 | if ((dev = dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1577 | return 0; |
1578 | ||
1579 | s_t = cb->args[0]; | |
1580 | t = 0; | |
1581 | ||
af356afa | 1582 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1583 | goto done; |
1584 | ||
1585 | dev_queue = &dev->rx_queue; | |
8123b421 | 1586 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 | 1587 | goto done; |
1da177e4 | 1588 | |
30723673 | 1589 | done: |
1da177e4 LT |
1590 | cb->args[0] = t; |
1591 | ||
1592 | dev_put(dev); | |
1593 | return skb->len; | |
1594 | } | |
1595 | ||
1596 | /* Main classifier routine: scans classifier chain attached | |
1597 | to this qdisc, (optionally) tests for protocol and asks | |
1598 | specific classifiers. | |
1599 | */ | |
73ca4918 PM |
1600 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1601 | struct tcf_result *res) | |
1602 | { | |
1603 | __be16 protocol = skb->protocol; | |
1604 | int err = 0; | |
1605 | ||
1606 | for (; tp; tp = tp->next) { | |
1607 | if ((tp->protocol == protocol || | |
1608 | tp->protocol == htons(ETH_P_ALL)) && | |
1609 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1610 | #ifdef CONFIG_NET_CLS_ACT | |
1611 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1612 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1613 | #endif | |
1614 | return err; | |
1615 | } | |
1616 | } | |
1617 | return -1; | |
1618 | } | |
1619 | EXPORT_SYMBOL(tc_classify_compat); | |
1620 | ||
1da177e4 | 1621 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1622 | struct tcf_result *res) |
1da177e4 LT |
1623 | { |
1624 | int err = 0; | |
73ca4918 | 1625 | __be16 protocol; |
1da177e4 LT |
1626 | #ifdef CONFIG_NET_CLS_ACT |
1627 | struct tcf_proto *otp = tp; | |
1628 | reclassify: | |
1629 | #endif | |
1630 | protocol = skb->protocol; | |
1631 | ||
73ca4918 | 1632 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1633 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1634 | if (err == TC_ACT_RECLASSIFY) { |
1635 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1636 | tp = otp; | |
1637 | ||
1638 | if (verd++ >= MAX_REC_LOOP) { | |
1639 | printk("rule prio %u protocol %02x reclassify loop, " | |
1640 | "packet dropped\n", | |
1641 | tp->prio&0xffff, ntohs(tp->protocol)); | |
1642 | return TC_ACT_SHOT; | |
1da177e4 | 1643 | } |
73ca4918 PM |
1644 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1645 | goto reclassify; | |
1da177e4 | 1646 | } |
73ca4918 PM |
1647 | #endif |
1648 | return err; | |
1da177e4 | 1649 | } |
73ca4918 | 1650 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1651 | |
a48b5a61 PM |
1652 | void tcf_destroy(struct tcf_proto *tp) |
1653 | { | |
1654 | tp->ops->destroy(tp); | |
1655 | module_put(tp->ops->owner); | |
1656 | kfree(tp); | |
1657 | } | |
1658 | ||
ff31ab56 | 1659 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1660 | { |
1661 | struct tcf_proto *tp; | |
1662 | ||
ff31ab56 PM |
1663 | while ((tp = *fl) != NULL) { |
1664 | *fl = tp->next; | |
a48b5a61 PM |
1665 | tcf_destroy(tp); |
1666 | } | |
1667 | } | |
1668 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1669 | ||
1da177e4 LT |
1670 | #ifdef CONFIG_PROC_FS |
1671 | static int psched_show(struct seq_file *seq, void *v) | |
1672 | { | |
3c0cfc13 PM |
1673 | struct timespec ts; |
1674 | ||
1675 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1676 | seq_printf(seq, "%08x %08x %08x %08x\n", |
ca44d6e6 | 1677 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1678 | 1000000, |
3c0cfc13 | 1679 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1680 | |
1681 | return 0; | |
1682 | } | |
1683 | ||
1684 | static int psched_open(struct inode *inode, struct file *file) | |
1685 | { | |
1686 | return single_open(file, psched_show, PDE(inode)->data); | |
1687 | } | |
1688 | ||
da7071d7 | 1689 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1690 | .owner = THIS_MODULE, |
1691 | .open = psched_open, | |
1692 | .read = seq_read, | |
1693 | .llseek = seq_lseek, | |
1694 | .release = single_release, | |
10297b99 | 1695 | }; |
7316ae88 TG |
1696 | |
1697 | static int __net_init psched_net_init(struct net *net) | |
1698 | { | |
1699 | struct proc_dir_entry *e; | |
1700 | ||
1701 | e = proc_net_fops_create(net, "psched", 0, &psched_fops); | |
1702 | if (e == NULL) | |
1703 | return -ENOMEM; | |
1704 | ||
1705 | return 0; | |
1706 | } | |
1707 | ||
1708 | static void __net_exit psched_net_exit(struct net *net) | |
1709 | { | |
1710 | proc_net_remove(net, "psched"); | |
1711 | ||
1712 | return; | |
1713 | } | |
1714 | #else | |
1715 | static int __net_init psched_net_init(struct net *net) | |
1716 | { | |
1717 | return 0; | |
1718 | } | |
1719 | ||
1720 | static void __net_exit psched_net_exit(struct net *net) | |
1721 | { | |
1722 | } | |
1da177e4 LT |
1723 | #endif |
1724 | ||
7316ae88 TG |
1725 | static struct pernet_operations psched_net_ops = { |
1726 | .init = psched_net_init, | |
1727 | .exit = psched_net_exit, | |
1728 | }; | |
1729 | ||
1da177e4 LT |
1730 | static int __init pktsched_init(void) |
1731 | { | |
7316ae88 TG |
1732 | int err; |
1733 | ||
1734 | err = register_pernet_subsys(&psched_net_ops); | |
1735 | if (err) { | |
1736 | printk(KERN_ERR "pktsched_init: " | |
1737 | "cannot initialize per netns operations\n"); | |
1738 | return err; | |
1739 | } | |
1740 | ||
1da177e4 LT |
1741 | register_qdisc(&pfifo_qdisc_ops); |
1742 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1743 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1744 | register_qdisc(&mq_qdisc_ops); |
1da177e4 | 1745 | |
be577ddc TG |
1746 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
1747 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); | |
1748 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); | |
1749 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); | |
1750 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); | |
1751 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); | |
1752 | ||
1da177e4 LT |
1753 | return 0; |
1754 | } | |
1755 | ||
1756 | subsys_initcall(pktsched_init); |