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> |
1da177e4 | 30 | |
457c4cbc | 31 | #include <net/net_namespace.h> |
b854272b | 32 | #include <net/sock.h> |
dc5fc579 | 33 | #include <net/netlink.h> |
1da177e4 LT |
34 | #include <net/pkt_sched.h> |
35 | ||
1da177e4 LT |
36 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, u32 clid, |
37 | struct Qdisc *old, struct Qdisc *new); | |
38 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
39 | struct Qdisc *q, unsigned long cl, int event); | |
40 | ||
41 | /* | |
42 | ||
43 | Short review. | |
44 | ------------- | |
45 | ||
46 | This file consists of two interrelated parts: | |
47 | ||
48 | 1. queueing disciplines manager frontend. | |
49 | 2. traffic classes manager frontend. | |
50 | ||
51 | Generally, queueing discipline ("qdisc") is a black box, | |
52 | which is able to enqueue packets and to dequeue them (when | |
53 | device is ready to send something) in order and at times | |
54 | determined by algorithm hidden in it. | |
55 | ||
56 | qdisc's are divided to two categories: | |
57 | - "queues", which have no internal structure visible from outside. | |
58 | - "schedulers", which split all the packets to "traffic classes", | |
59 | using "packet classifiers" (look at cls_api.c) | |
60 | ||
61 | In turn, classes may have child qdiscs (as rule, queues) | |
62 | attached to them etc. etc. etc. | |
63 | ||
64 | The goal of the routines in this file is to translate | |
65 | information supplied by user in the form of handles | |
66 | to more intelligible for kernel form, to make some sanity | |
67 | checks and part of work, which is common to all qdiscs | |
68 | and to provide rtnetlink notifications. | |
69 | ||
70 | All real intelligent work is done inside qdisc modules. | |
71 | ||
72 | ||
73 | ||
74 | Every discipline has two major routines: enqueue and dequeue. | |
75 | ||
76 | ---dequeue | |
77 | ||
78 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
79 | but it does not mean that queue is empty, it just means that | |
80 | discipline does not want to send anything this time. | |
81 | Queue is really empty if q->q.qlen == 0. | |
82 | For complicated disciplines with multiple queues q->q is not | |
83 | real packet queue, but however q->q.qlen must be valid. | |
84 | ||
85 | ---enqueue | |
86 | ||
87 | enqueue returns 0, if packet was enqueued successfully. | |
88 | If packet (this one or another one) was dropped, it returns | |
89 | not zero error code. | |
90 | NET_XMIT_DROP - this packet dropped | |
91 | Expected action: do not backoff, but wait until queue will clear. | |
92 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
93 | Expected action: backoff or ignore | |
94 | NET_XMIT_POLICED - dropped by police. | |
95 | Expected action: backoff or error to real-time apps. | |
96 | ||
97 | Auxiliary routines: | |
98 | ||
99 | ---requeue | |
100 | ||
101 | requeues once dequeued packet. It is used for non-standard or | |
e65d22e1 | 102 | just buggy devices, which can defer output even if netif_queue_stopped()=0. |
1da177e4 LT |
103 | |
104 | ---reset | |
105 | ||
106 | returns qdisc to initial state: purge all buffers, clear all | |
107 | timers, counters (except for statistics) etc. | |
108 | ||
109 | ---init | |
110 | ||
111 | initializes newly created qdisc. | |
112 | ||
113 | ---destroy | |
114 | ||
115 | destroys resources allocated by init and during lifetime of qdisc. | |
116 | ||
117 | ---change | |
118 | ||
119 | changes qdisc parameters. | |
120 | */ | |
121 | ||
122 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
123 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
124 | ||
125 | ||
126 | /************************************************ | |
127 | * Queueing disciplines manipulation. * | |
128 | ************************************************/ | |
129 | ||
130 | ||
131 | /* The list of all installed queueing disciplines. */ | |
132 | ||
133 | static struct Qdisc_ops *qdisc_base; | |
134 | ||
135 | /* Register/uregister queueing discipline */ | |
136 | ||
137 | int register_qdisc(struct Qdisc_ops *qops) | |
138 | { | |
139 | struct Qdisc_ops *q, **qp; | |
140 | int rc = -EEXIST; | |
141 | ||
142 | write_lock(&qdisc_mod_lock); | |
143 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
144 | if (!strcmp(qops->id, q->id)) | |
145 | goto out; | |
146 | ||
147 | if (qops->enqueue == NULL) | |
148 | qops->enqueue = noop_qdisc_ops.enqueue; | |
149 | if (qops->requeue == NULL) | |
150 | qops->requeue = noop_qdisc_ops.requeue; | |
151 | if (qops->dequeue == NULL) | |
152 | qops->dequeue = noop_qdisc_ops.dequeue; | |
153 | ||
154 | qops->next = NULL; | |
155 | *qp = qops; | |
156 | rc = 0; | |
157 | out: | |
158 | write_unlock(&qdisc_mod_lock); | |
159 | return rc; | |
160 | } | |
62e3ba1b | 161 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
162 | |
163 | int unregister_qdisc(struct Qdisc_ops *qops) | |
164 | { | |
165 | struct Qdisc_ops *q, **qp; | |
166 | int err = -ENOENT; | |
167 | ||
168 | write_lock(&qdisc_mod_lock); | |
169 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) | |
170 | if (q == qops) | |
171 | break; | |
172 | if (q) { | |
173 | *qp = q->next; | |
174 | q->next = NULL; | |
175 | err = 0; | |
176 | } | |
177 | write_unlock(&qdisc_mod_lock); | |
178 | return err; | |
179 | } | |
62e3ba1b | 180 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 LT |
181 | |
182 | /* We know handle. Find qdisc among all qdisc's attached to device | |
183 | (root qdisc, all its children, children of children etc.) | |
184 | */ | |
185 | ||
ead81cc5 | 186 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 187 | { |
30723673 DM |
188 | unsigned int i; |
189 | ||
190 | for (i = 0; i < dev->num_tx_queues; i++) { | |
191 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
192 | struct Qdisc *q, *txq_root = txq->qdisc; | |
1da177e4 | 193 | |
30723673 DM |
194 | if (!(txq_root->flags & TCQ_F_BUILTIN) && |
195 | txq_root->handle == handle) | |
196 | return txq_root; | |
197 | ||
198 | list_for_each_entry(q, &txq_root->list, list) { | |
199 | if (q->handle == handle) | |
200 | return q; | |
201 | } | |
1da177e4 | 202 | } |
1da177e4 LT |
203 | return NULL; |
204 | } | |
205 | ||
206 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
207 | { | |
208 | unsigned long cl; | |
209 | struct Qdisc *leaf; | |
20fea08b | 210 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
211 | |
212 | if (cops == NULL) | |
213 | return NULL; | |
214 | cl = cops->get(p, classid); | |
215 | ||
216 | if (cl == 0) | |
217 | return NULL; | |
218 | leaf = cops->leaf(p, cl); | |
219 | cops->put(p, cl); | |
220 | return leaf; | |
221 | } | |
222 | ||
223 | /* Find queueing discipline by name */ | |
224 | ||
1e90474c | 225 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
226 | { |
227 | struct Qdisc_ops *q = NULL; | |
228 | ||
229 | if (kind) { | |
230 | read_lock(&qdisc_mod_lock); | |
231 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 232 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
233 | if (!try_module_get(q->owner)) |
234 | q = NULL; | |
235 | break; | |
236 | } | |
237 | } | |
238 | read_unlock(&qdisc_mod_lock); | |
239 | } | |
240 | return q; | |
241 | } | |
242 | ||
243 | static struct qdisc_rate_table *qdisc_rtab_list; | |
244 | ||
1e90474c | 245 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
246 | { |
247 | struct qdisc_rate_table *rtab; | |
248 | ||
249 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
250 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
251 | rtab->refcnt++; | |
252 | return rtab; | |
253 | } | |
254 | } | |
255 | ||
5feb5e1a PM |
256 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
257 | nla_len(tab) != TC_RTAB_SIZE) | |
1da177e4 LT |
258 | return NULL; |
259 | ||
260 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
261 | if (rtab) { | |
262 | rtab->rate = *r; | |
263 | rtab->refcnt = 1; | |
1e90474c | 264 | memcpy(rtab->data, nla_data(tab), 1024); |
1da177e4 LT |
265 | rtab->next = qdisc_rtab_list; |
266 | qdisc_rtab_list = rtab; | |
267 | } | |
268 | return rtab; | |
269 | } | |
62e3ba1b | 270 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
271 | |
272 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
273 | { | |
274 | struct qdisc_rate_table *rtab, **rtabp; | |
275 | ||
276 | if (!tab || --tab->refcnt) | |
277 | return; | |
278 | ||
279 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
280 | if (rtab == tab) { | |
281 | *rtabp = rtab->next; | |
282 | kfree(rtab); | |
283 | return; | |
284 | } | |
285 | } | |
286 | } | |
62e3ba1b | 287 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 288 | |
175f9c1b JK |
289 | static LIST_HEAD(qdisc_stab_list); |
290 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
291 | ||
292 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
293 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
294 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
295 | }; | |
296 | ||
297 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
298 | { | |
299 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
300 | struct qdisc_size_table *stab; | |
301 | struct tc_sizespec *s; | |
302 | unsigned int tsize = 0; | |
303 | u16 *tab = NULL; | |
304 | int err; | |
305 | ||
306 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
307 | if (err < 0) | |
308 | return ERR_PTR(err); | |
309 | if (!tb[TCA_STAB_BASE]) | |
310 | return ERR_PTR(-EINVAL); | |
311 | ||
312 | s = nla_data(tb[TCA_STAB_BASE]); | |
313 | ||
314 | if (s->tsize > 0) { | |
315 | if (!tb[TCA_STAB_DATA]) | |
316 | return ERR_PTR(-EINVAL); | |
317 | tab = nla_data(tb[TCA_STAB_DATA]); | |
318 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
319 | } | |
320 | ||
321 | if (!s || tsize != s->tsize || (!tab && tsize > 0)) | |
322 | return ERR_PTR(-EINVAL); | |
323 | ||
324 | spin_lock(&qdisc_stab_lock); | |
325 | ||
326 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
327 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
328 | continue; | |
329 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
330 | continue; | |
331 | stab->refcnt++; | |
332 | spin_unlock(&qdisc_stab_lock); | |
333 | return stab; | |
334 | } | |
335 | ||
336 | spin_unlock(&qdisc_stab_lock); | |
337 | ||
338 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
339 | if (!stab) | |
340 | return ERR_PTR(-ENOMEM); | |
341 | ||
342 | stab->refcnt = 1; | |
343 | stab->szopts = *s; | |
344 | if (tsize > 0) | |
345 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
346 | ||
347 | spin_lock(&qdisc_stab_lock); | |
348 | list_add_tail(&stab->list, &qdisc_stab_list); | |
349 | spin_unlock(&qdisc_stab_lock); | |
350 | ||
351 | return stab; | |
352 | } | |
353 | ||
354 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
355 | { | |
356 | if (!tab) | |
357 | return; | |
358 | ||
359 | spin_lock(&qdisc_stab_lock); | |
360 | ||
361 | if (--tab->refcnt == 0) { | |
362 | list_del(&tab->list); | |
363 | kfree(tab); | |
364 | } | |
365 | ||
366 | spin_unlock(&qdisc_stab_lock); | |
367 | } | |
368 | EXPORT_SYMBOL(qdisc_put_stab); | |
369 | ||
370 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
371 | { | |
372 | struct nlattr *nest; | |
373 | ||
374 | nest = nla_nest_start(skb, TCA_STAB); | |
375 | NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); | |
376 | nla_nest_end(skb, nest); | |
377 | ||
378 | return skb->len; | |
379 | ||
380 | nla_put_failure: | |
381 | return -1; | |
382 | } | |
383 | ||
384 | void qdisc_calculate_pkt_len(struct sk_buff *skb, struct qdisc_size_table *stab) | |
385 | { | |
386 | int pkt_len, slot; | |
387 | ||
388 | pkt_len = skb->len + stab->szopts.overhead; | |
389 | if (unlikely(!stab->szopts.tsize)) | |
390 | goto out; | |
391 | ||
392 | slot = pkt_len + stab->szopts.cell_align; | |
393 | if (unlikely(slot < 0)) | |
394 | slot = 0; | |
395 | ||
396 | slot >>= stab->szopts.cell_log; | |
397 | if (likely(slot < stab->szopts.tsize)) | |
398 | pkt_len = stab->data[slot]; | |
399 | else | |
400 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
401 | (slot / stab->szopts.tsize) + | |
402 | stab->data[slot % stab->szopts.tsize]; | |
403 | ||
404 | pkt_len <<= stab->szopts.size_log; | |
405 | out: | |
406 | if (unlikely(pkt_len < 1)) | |
407 | pkt_len = 1; | |
408 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
409 | } | |
410 | EXPORT_SYMBOL(qdisc_calculate_pkt_len); | |
411 | ||
4179477f PM |
412 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
413 | { | |
414 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
415 | timer); | |
416 | ||
417 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
11274e5a | 418 | smp_wmb(); |
37437bb2 | 419 | __netif_schedule(wd->qdisc); |
1936502d | 420 | |
4179477f PM |
421 | return HRTIMER_NORESTART; |
422 | } | |
423 | ||
424 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
425 | { | |
426 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
427 | wd->timer.function = qdisc_watchdog; | |
428 | wd->qdisc = qdisc; | |
429 | } | |
430 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
431 | ||
432 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
433 | { | |
434 | ktime_t time; | |
435 | ||
436 | wd->qdisc->flags |= TCQ_F_THROTTLED; | |
437 | time = ktime_set(0, 0); | |
438 | time = ktime_add_ns(time, PSCHED_US2NS(expires)); | |
439 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); | |
440 | } | |
441 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
442 | ||
443 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
444 | { | |
445 | hrtimer_cancel(&wd->timer); | |
446 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
447 | } | |
448 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 449 | |
a94f779f | 450 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
451 | { |
452 | unsigned int size = n * sizeof(struct hlist_head), i; | |
453 | struct hlist_head *h; | |
454 | ||
455 | if (size <= PAGE_SIZE) | |
456 | h = kmalloc(size, GFP_KERNEL); | |
457 | else | |
458 | h = (struct hlist_head *) | |
459 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
460 | ||
461 | if (h != NULL) { | |
462 | for (i = 0; i < n; i++) | |
463 | INIT_HLIST_HEAD(&h[i]); | |
464 | } | |
465 | return h; | |
466 | } | |
467 | ||
468 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
469 | { | |
470 | unsigned int size = n * sizeof(struct hlist_head); | |
471 | ||
472 | if (size <= PAGE_SIZE) | |
473 | kfree(h); | |
474 | else | |
475 | free_pages((unsigned long)h, get_order(size)); | |
476 | } | |
477 | ||
478 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
479 | { | |
480 | struct Qdisc_class_common *cl; | |
481 | struct hlist_node *n, *next; | |
482 | struct hlist_head *nhash, *ohash; | |
483 | unsigned int nsize, nmask, osize; | |
484 | unsigned int i, h; | |
485 | ||
486 | /* Rehash when load factor exceeds 0.75 */ | |
487 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
488 | return; | |
489 | nsize = clhash->hashsize * 2; | |
490 | nmask = nsize - 1; | |
491 | nhash = qdisc_class_hash_alloc(nsize); | |
492 | if (nhash == NULL) | |
493 | return; | |
494 | ||
495 | ohash = clhash->hash; | |
496 | osize = clhash->hashsize; | |
497 | ||
498 | sch_tree_lock(sch); | |
499 | for (i = 0; i < osize; i++) { | |
500 | hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) { | |
501 | h = qdisc_class_hash(cl->classid, nmask); | |
502 | hlist_add_head(&cl->hnode, &nhash[h]); | |
503 | } | |
504 | } | |
505 | clhash->hash = nhash; | |
506 | clhash->hashsize = nsize; | |
507 | clhash->hashmask = nmask; | |
508 | sch_tree_unlock(sch); | |
509 | ||
510 | qdisc_class_hash_free(ohash, osize); | |
511 | } | |
512 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
513 | ||
514 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
515 | { | |
516 | unsigned int size = 4; | |
517 | ||
518 | clhash->hash = qdisc_class_hash_alloc(size); | |
519 | if (clhash->hash == NULL) | |
520 | return -ENOMEM; | |
521 | clhash->hashsize = size; | |
522 | clhash->hashmask = size - 1; | |
523 | clhash->hashelems = 0; | |
524 | return 0; | |
525 | } | |
526 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
527 | ||
528 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
529 | { | |
530 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
531 | } | |
532 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
533 | ||
534 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
535 | struct Qdisc_class_common *cl) | |
536 | { | |
537 | unsigned int h; | |
538 | ||
539 | INIT_HLIST_NODE(&cl->hnode); | |
540 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
541 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
542 | clhash->hashelems++; | |
543 | } | |
544 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
545 | ||
546 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
547 | struct Qdisc_class_common *cl) | |
548 | { | |
549 | hlist_del(&cl->hnode); | |
550 | clhash->hashelems--; | |
551 | } | |
552 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
553 | ||
1da177e4 LT |
554 | /* Allocate an unique handle from space managed by kernel */ |
555 | ||
556 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
557 | { | |
558 | int i = 0x10000; | |
559 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
560 | ||
561 | do { | |
562 | autohandle += TC_H_MAKE(0x10000U, 0); | |
563 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
564 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
565 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
566 | ||
567 | return i>0 ? autohandle : 0; | |
568 | } | |
569 | ||
99194cff | 570 | /* Attach toplevel qdisc to device queue. */ |
1da177e4 | 571 | |
99194cff DM |
572 | static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
573 | struct Qdisc *qdisc) | |
1da177e4 | 574 | { |
53049978 | 575 | spinlock_t *root_lock; |
1da177e4 | 576 | struct Qdisc *oqdisc; |
53049978 | 577 | int ingress; |
1da177e4 | 578 | |
53049978 DM |
579 | ingress = 0; |
580 | if (qdisc && qdisc->flags&TCQ_F_INGRESS) | |
581 | ingress = 1; | |
582 | ||
583 | if (ingress) { | |
816f3258 | 584 | oqdisc = dev_queue->qdisc; |
53049978 | 585 | } else { |
53049978 DM |
586 | oqdisc = dev_queue->qdisc_sleeping; |
587 | } | |
588 | ||
589 | root_lock = qdisc_root_lock(oqdisc); | |
590 | spin_lock_bh(root_lock); | |
591 | ||
592 | if (ingress) { | |
1da177e4 LT |
593 | /* Prune old scheduler */ |
594 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) { | |
595 | /* delete */ | |
596 | qdisc_reset(oqdisc); | |
816f3258 | 597 | dev_queue->qdisc = NULL; |
1da177e4 | 598 | } else { /* new */ |
816f3258 | 599 | dev_queue->qdisc = qdisc; |
1da177e4 LT |
600 | } |
601 | ||
602 | } else { | |
1da177e4 LT |
603 | /* Prune old scheduler */ |
604 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
605 | qdisc_reset(oqdisc); | |
606 | ||
607 | /* ... and graft new one */ | |
608 | if (qdisc == NULL) | |
609 | qdisc = &noop_qdisc; | |
b0e1e646 DM |
610 | dev_queue->qdisc_sleeping = qdisc; |
611 | dev_queue->qdisc = &noop_qdisc; | |
1da177e4 LT |
612 | } |
613 | ||
53049978 | 614 | spin_unlock_bh(root_lock); |
1da177e4 | 615 | |
1da177e4 LT |
616 | return oqdisc; |
617 | } | |
618 | ||
43effa1e PM |
619 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
620 | { | |
20fea08b | 621 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
622 | unsigned long cl; |
623 | u32 parentid; | |
624 | ||
625 | if (n == 0) | |
626 | return; | |
627 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
628 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
629 | return; | |
630 | ||
5ce2d488 | 631 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
632 | if (sch == NULL) { |
633 | WARN_ON(parentid != TC_H_ROOT); | |
634 | return; | |
635 | } | |
43effa1e PM |
636 | cops = sch->ops->cl_ops; |
637 | if (cops->qlen_notify) { | |
638 | cl = cops->get(sch, parentid); | |
639 | cops->qlen_notify(sch, cl); | |
640 | cops->put(sch, cl); | |
641 | } | |
642 | sch->q.qlen -= n; | |
643 | } | |
644 | } | |
645 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 646 | |
99194cff DM |
647 | static void notify_and_destroy(struct sk_buff *skb, struct nlmsghdr *n, u32 clid, |
648 | struct Qdisc *old, struct Qdisc *new) | |
649 | { | |
650 | if (new || old) | |
651 | qdisc_notify(skb, n, clid, old, new); | |
1da177e4 | 652 | |
99194cff DM |
653 | if (old) { |
654 | spin_lock_bh(&old->q.lock); | |
655 | qdisc_destroy(old); | |
656 | spin_unlock_bh(&old->q.lock); | |
657 | } | |
658 | } | |
659 | ||
660 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
661 | * to device "dev". | |
662 | * | |
663 | * When appropriate send a netlink notification using 'skb' | |
664 | * and "n". | |
665 | * | |
666 | * On success, destroy old qdisc. | |
1da177e4 LT |
667 | */ |
668 | ||
669 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
670 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
671 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 672 | { |
99194cff | 673 | struct Qdisc *q = old; |
1da177e4 | 674 | int err = 0; |
1da177e4 | 675 | |
10297b99 | 676 | if (parent == NULL) { |
99194cff DM |
677 | unsigned int i, num_q, ingress; |
678 | ||
679 | ingress = 0; | |
680 | num_q = dev->num_tx_queues; | |
681 | if (q && q->flags & TCQ_F_INGRESS) { | |
682 | num_q = 1; | |
683 | ingress = 1; | |
684 | } | |
685 | ||
686 | if (dev->flags & IFF_UP) | |
687 | dev_deactivate(dev); | |
688 | ||
689 | for (i = 0; i < num_q; i++) { | |
690 | struct netdev_queue *dev_queue = &dev->rx_queue; | |
691 | ||
692 | if (!ingress) | |
693 | dev_queue = netdev_get_tx_queue(dev, i); | |
694 | ||
695 | if (ingress) { | |
696 | old = dev_graft_qdisc(dev_queue, q); | |
697 | } else { | |
698 | old = dev_graft_qdisc(dev_queue, new); | |
699 | if (new && i > 0) | |
700 | atomic_inc(&new->refcnt); | |
701 | } | |
702 | notify_and_destroy(skb, n, classid, old, new); | |
1da177e4 | 703 | } |
99194cff DM |
704 | |
705 | if (dev->flags & IFF_UP) | |
706 | dev_activate(dev); | |
1da177e4 | 707 | } else { |
20fea08b | 708 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 LT |
709 | |
710 | err = -EINVAL; | |
711 | ||
712 | if (cops) { | |
713 | unsigned long cl = cops->get(parent, classid); | |
714 | if (cl) { | |
99194cff | 715 | err = cops->graft(parent, cl, new, &old); |
1da177e4 LT |
716 | cops->put(parent, cl); |
717 | } | |
718 | } | |
99194cff DM |
719 | if (!err) |
720 | notify_and_destroy(skb, n, classid, old, new); | |
1da177e4 LT |
721 | } |
722 | return err; | |
723 | } | |
724 | ||
725 | /* | |
726 | Allocate and initialize new qdisc. | |
727 | ||
728 | Parameters are passed via opt. | |
729 | */ | |
730 | ||
731 | static struct Qdisc * | |
bb949fbd DM |
732 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
733 | u32 parent, u32 handle, struct nlattr **tca, int *errp) | |
1da177e4 LT |
734 | { |
735 | int err; | |
1e90474c | 736 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
737 | struct Qdisc *sch; |
738 | struct Qdisc_ops *ops; | |
175f9c1b | 739 | struct qdisc_size_table *stab; |
1da177e4 LT |
740 | |
741 | ops = qdisc_lookup_ops(kind); | |
742 | #ifdef CONFIG_KMOD | |
743 | if (ops == NULL && kind != NULL) { | |
744 | char name[IFNAMSIZ]; | |
1e90474c | 745 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
746 | /* We dropped the RTNL semaphore in order to |
747 | * perform the module load. So, even if we | |
748 | * succeeded in loading the module we have to | |
749 | * tell the caller to replay the request. We | |
750 | * indicate this using -EAGAIN. | |
751 | * We replay the request because the device may | |
752 | * go away in the mean time. | |
753 | */ | |
754 | rtnl_unlock(); | |
755 | request_module("sch_%s", name); | |
756 | rtnl_lock(); | |
757 | ops = qdisc_lookup_ops(kind); | |
758 | if (ops != NULL) { | |
759 | /* We will try again qdisc_lookup_ops, | |
760 | * so don't keep a reference. | |
761 | */ | |
762 | module_put(ops->owner); | |
763 | err = -EAGAIN; | |
764 | goto err_out; | |
765 | } | |
766 | } | |
767 | } | |
768 | #endif | |
769 | ||
b9e2cc0f | 770 | err = -ENOENT; |
1da177e4 LT |
771 | if (ops == NULL) |
772 | goto err_out; | |
773 | ||
5ce2d488 | 774 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
775 | if (IS_ERR(sch)) { |
776 | err = PTR_ERR(sch); | |
1da177e4 | 777 | goto err_out2; |
3d54b82f | 778 | } |
1da177e4 | 779 | |
ffc8fefa PM |
780 | sch->parent = parent; |
781 | ||
3d54b82f | 782 | if (handle == TC_H_INGRESS) { |
1da177e4 | 783 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 784 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
fd44de7c | 785 | } else { |
fd44de7c PM |
786 | if (handle == 0) { |
787 | handle = qdisc_alloc_handle(dev); | |
788 | err = -ENOMEM; | |
789 | if (handle == 0) | |
790 | goto err_out3; | |
791 | } | |
1da177e4 LT |
792 | } |
793 | ||
3d54b82f | 794 | sch->handle = handle; |
1da177e4 | 795 | |
1e90474c | 796 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
797 | if (tca[TCA_STAB]) { |
798 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
799 | if (IS_ERR(stab)) { | |
800 | err = PTR_ERR(stab); | |
801 | goto err_out3; | |
802 | } | |
803 | sch->stab = stab; | |
804 | } | |
1e90474c | 805 | if (tca[TCA_RATE]) { |
023e09a7 | 806 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
7698b4fc | 807 | qdisc_root_lock(sch), |
1e90474c | 808 | tca[TCA_RATE]); |
023e09a7 TG |
809 | if (err) { |
810 | /* | |
811 | * Any broken qdiscs that would require | |
812 | * a ops->reset() here? The qdisc was never | |
813 | * in action so it shouldn't be necessary. | |
814 | */ | |
815 | if (ops->destroy) | |
816 | ops->destroy(sch); | |
817 | goto err_out3; | |
818 | } | |
819 | } | |
30723673 DM |
820 | if (parent) |
821 | list_add_tail(&sch->list, &dev_queue->qdisc->list); | |
1da177e4 | 822 | |
1da177e4 LT |
823 | return sch; |
824 | } | |
825 | err_out3: | |
175f9c1b | 826 | qdisc_put_stab(sch->stab); |
1da177e4 | 827 | dev_put(dev); |
3d54b82f | 828 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
829 | err_out2: |
830 | module_put(ops->owner); | |
831 | err_out: | |
832 | *errp = err; | |
1da177e4 LT |
833 | return NULL; |
834 | } | |
835 | ||
1e90474c | 836 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 837 | { |
175f9c1b JK |
838 | struct qdisc_size_table *stab = NULL; |
839 | int err = 0; | |
1da177e4 | 840 | |
175f9c1b | 841 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
842 | if (sch->ops->change == NULL) |
843 | return -EINVAL; | |
1e90474c | 844 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
845 | if (err) |
846 | return err; | |
847 | } | |
175f9c1b JK |
848 | |
849 | if (tca[TCA_STAB]) { | |
850 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
851 | if (IS_ERR(stab)) | |
852 | return PTR_ERR(stab); | |
853 | } | |
854 | ||
855 | qdisc_put_stab(sch->stab); | |
856 | sch->stab = stab; | |
857 | ||
1e90474c | 858 | if (tca[TCA_RATE]) |
1da177e4 | 859 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
7698b4fc | 860 | qdisc_root_lock(sch), tca[TCA_RATE]); |
1da177e4 LT |
861 | return 0; |
862 | } | |
863 | ||
864 | struct check_loop_arg | |
865 | { | |
866 | struct qdisc_walker w; | |
867 | struct Qdisc *p; | |
868 | int depth; | |
869 | }; | |
870 | ||
871 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
872 | ||
873 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
874 | { | |
875 | struct check_loop_arg arg; | |
876 | ||
877 | if (q->ops->cl_ops == NULL) | |
878 | return 0; | |
879 | ||
880 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
881 | arg.w.fn = check_loop_fn; | |
882 | arg.depth = depth; | |
883 | arg.p = p; | |
884 | q->ops->cl_ops->walk(q, &arg.w); | |
885 | return arg.w.stop ? -ELOOP : 0; | |
886 | } | |
887 | ||
888 | static int | |
889 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
890 | { | |
891 | struct Qdisc *leaf; | |
20fea08b | 892 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
893 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
894 | ||
895 | leaf = cops->leaf(q, cl); | |
896 | if (leaf) { | |
897 | if (leaf == arg->p || arg->depth > 7) | |
898 | return -ELOOP; | |
899 | return check_loop(leaf, arg->p, arg->depth + 1); | |
900 | } | |
901 | return 0; | |
902 | } | |
903 | ||
904 | /* | |
905 | * Delete/get qdisc. | |
906 | */ | |
907 | ||
908 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
909 | { | |
3b1e0a65 | 910 | struct net *net = sock_net(skb->sk); |
1da177e4 | 911 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 912 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
913 | struct net_device *dev; |
914 | u32 clid = tcm->tcm_parent; | |
915 | struct Qdisc *q = NULL; | |
916 | struct Qdisc *p = NULL; | |
917 | int err; | |
918 | ||
b854272b DL |
919 | if (net != &init_net) |
920 | return -EINVAL; | |
921 | ||
881d966b | 922 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
923 | return -ENODEV; |
924 | ||
1e90474c PM |
925 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
926 | if (err < 0) | |
927 | return err; | |
928 | ||
1da177e4 LT |
929 | if (clid) { |
930 | if (clid != TC_H_ROOT) { | |
931 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
932 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
933 | return -ENOENT; | |
934 | q = qdisc_leaf(p, clid); | |
935 | } else { /* ingress */ | |
816f3258 | 936 | q = dev->rx_queue.qdisc; |
10297b99 | 937 | } |
1da177e4 | 938 | } else { |
e8a0464c DM |
939 | struct netdev_queue *dev_queue; |
940 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 941 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
942 | } |
943 | if (!q) | |
944 | return -ENOENT; | |
945 | ||
946 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
947 | return -EINVAL; | |
948 | } else { | |
949 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
950 | return -ENOENT; | |
951 | } | |
952 | ||
1e90474c | 953 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
954 | return -EINVAL; |
955 | ||
956 | if (n->nlmsg_type == RTM_DELQDISC) { | |
957 | if (!clid) | |
958 | return -EINVAL; | |
959 | if (q->handle == 0) | |
960 | return -ENOENT; | |
99194cff | 961 | if ((err = qdisc_graft(dev, p, skb, n, clid, NULL, q)) != 0) |
1da177e4 | 962 | return err; |
1da177e4 LT |
963 | } else { |
964 | qdisc_notify(skb, n, clid, NULL, q); | |
965 | } | |
966 | return 0; | |
967 | } | |
968 | ||
969 | /* | |
970 | Create/change qdisc. | |
971 | */ | |
972 | ||
973 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
974 | { | |
3b1e0a65 | 975 | struct net *net = sock_net(skb->sk); |
1da177e4 | 976 | struct tcmsg *tcm; |
1e90474c | 977 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
978 | struct net_device *dev; |
979 | u32 clid; | |
980 | struct Qdisc *q, *p; | |
981 | int err; | |
982 | ||
b854272b DL |
983 | if (net != &init_net) |
984 | return -EINVAL; | |
985 | ||
1da177e4 LT |
986 | replay: |
987 | /* Reinit, just in case something touches this. */ | |
988 | tcm = NLMSG_DATA(n); | |
1da177e4 LT |
989 | clid = tcm->tcm_parent; |
990 | q = p = NULL; | |
991 | ||
881d966b | 992 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
993 | return -ENODEV; |
994 | ||
1e90474c PM |
995 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
996 | if (err < 0) | |
997 | return err; | |
998 | ||
1da177e4 LT |
999 | if (clid) { |
1000 | if (clid != TC_H_ROOT) { | |
1001 | if (clid != TC_H_INGRESS) { | |
1002 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
1003 | return -ENOENT; | |
1004 | q = qdisc_leaf(p, clid); | |
1005 | } else { /*ingress */ | |
816f3258 | 1006 | q = dev->rx_queue.qdisc; |
1da177e4 LT |
1007 | } |
1008 | } else { | |
e8a0464c DM |
1009 | struct netdev_queue *dev_queue; |
1010 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 1011 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | /* It may be default qdisc, ignore it */ | |
1015 | if (q && q->handle == 0) | |
1016 | q = NULL; | |
1017 | ||
1018 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1019 | if (tcm->tcm_handle) { | |
1020 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
1021 | return -EEXIST; | |
1022 | if (TC_H_MIN(tcm->tcm_handle)) | |
1023 | return -EINVAL; | |
1024 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
1025 | goto create_n_graft; | |
1026 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1027 | return -EEXIST; | |
1e90474c | 1028 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1029 | return -EINVAL; |
1030 | if (q == p || | |
1031 | (p && check_loop(q, p, 0))) | |
1032 | return -ELOOP; | |
1033 | atomic_inc(&q->refcnt); | |
1034 | goto graft; | |
1035 | } else { | |
1036 | if (q == NULL) | |
1037 | goto create_n_graft; | |
1038 | ||
1039 | /* This magic test requires explanation. | |
1040 | * | |
1041 | * We know, that some child q is already | |
1042 | * attached to this parent and have choice: | |
1043 | * either to change it or to create/graft new one. | |
1044 | * | |
1045 | * 1. We are allowed to create/graft only | |
1046 | * if CREATE and REPLACE flags are set. | |
1047 | * | |
1048 | * 2. If EXCL is set, requestor wanted to say, | |
1049 | * that qdisc tcm_handle is not expected | |
1050 | * to exist, so that we choose create/graft too. | |
1051 | * | |
1052 | * 3. The last case is when no flags are set. | |
1053 | * Alas, it is sort of hole in API, we | |
1054 | * cannot decide what to do unambiguously. | |
1055 | * For now we select create/graft, if | |
1056 | * user gave KIND, which does not match existing. | |
1057 | */ | |
1058 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
1059 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
1060 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
1e90474c PM |
1061 | (tca[TCA_KIND] && |
1062 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1063 | goto create_n_graft; |
1064 | } | |
1065 | } | |
1066 | } else { | |
1067 | if (!tcm->tcm_handle) | |
1068 | return -EINVAL; | |
1069 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1070 | } | |
1071 | ||
1072 | /* Change qdisc parameters */ | |
1073 | if (q == NULL) | |
1074 | return -ENOENT; | |
1075 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1076 | return -EEXIST; | |
1e90474c | 1077 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1078 | return -EINVAL; |
1079 | err = qdisc_change(q, tca); | |
1080 | if (err == 0) | |
1081 | qdisc_notify(skb, n, clid, NULL, q); | |
1082 | return err; | |
1083 | ||
1084 | create_n_graft: | |
1085 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
1086 | return -ENOENT; | |
1087 | if (clid == TC_H_INGRESS) | |
bb949fbd DM |
1088 | q = qdisc_create(dev, &dev->rx_queue, |
1089 | tcm->tcm_parent, tcm->tcm_parent, | |
ffc8fefa | 1090 | tca, &err); |
10297b99 | 1091 | else |
e8a0464c | 1092 | q = qdisc_create(dev, netdev_get_tx_queue(dev, 0), |
bb949fbd | 1093 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1094 | tca, &err); |
1da177e4 LT |
1095 | if (q == NULL) { |
1096 | if (err == -EAGAIN) | |
1097 | goto replay; | |
1098 | return err; | |
1099 | } | |
1100 | ||
1101 | graft: | |
1102 | if (1) { | |
53049978 DM |
1103 | spinlock_t *root_lock; |
1104 | ||
99194cff | 1105 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1da177e4 LT |
1106 | if (err) { |
1107 | if (q) { | |
53049978 DM |
1108 | root_lock = qdisc_root_lock(q); |
1109 | spin_lock_bh(root_lock); | |
1da177e4 | 1110 | qdisc_destroy(q); |
53049978 | 1111 | spin_unlock_bh(root_lock); |
1da177e4 LT |
1112 | } |
1113 | return err; | |
1114 | } | |
1da177e4 LT |
1115 | } |
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 1120 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1121 | { |
1122 | struct tcmsg *tcm; | |
1123 | struct nlmsghdr *nlh; | |
27a884dc | 1124 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1125 | struct gnet_dump d; |
1126 | ||
e431b8c0 | 1127 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1128 | tcm = NLMSG_DATA(nlh); |
1129 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1130 | tcm->tcm__pad1 = 0; |
1131 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1132 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1133 | tcm->tcm_parent = clid; |
1134 | tcm->tcm_handle = q->handle; | |
1135 | tcm->tcm_info = atomic_read(&q->refcnt); | |
57e1c487 | 1136 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1137 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1138 | goto nla_put_failure; |
1da177e4 LT |
1139 | q->qstats.qlen = q->q.qlen; |
1140 | ||
175f9c1b JK |
1141 | if (q->stab && qdisc_dump_stab(skb, q->stab) < 0) |
1142 | goto nla_put_failure; | |
1143 | ||
1da177e4 | 1144 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, |
7698b4fc | 1145 | TCA_XSTATS, qdisc_root_lock(q), &d) < 0) |
1e90474c | 1146 | goto nla_put_failure; |
1da177e4 LT |
1147 | |
1148 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1149 | goto nla_put_failure; |
1da177e4 LT |
1150 | |
1151 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
1da177e4 | 1152 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
1da177e4 | 1153 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1154 | goto nla_put_failure; |
10297b99 | 1155 | |
1da177e4 | 1156 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1157 | goto nla_put_failure; |
10297b99 | 1158 | |
27a884dc | 1159 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1160 | return skb->len; |
1161 | ||
1162 | nlmsg_failure: | |
1e90474c | 1163 | nla_put_failure: |
dc5fc579 | 1164 | nlmsg_trim(skb, b); |
1da177e4 LT |
1165 | return -1; |
1166 | } | |
1167 | ||
1168 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1169 | u32 clid, struct Qdisc *old, struct Qdisc *new) | |
1170 | { | |
1171 | struct sk_buff *skb; | |
1172 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1173 | ||
1174 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1175 | if (!skb) | |
1176 | return -ENOBUFS; | |
1177 | ||
1178 | if (old && old->handle) { | |
1179 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) | |
1180 | goto err_out; | |
1181 | } | |
1182 | if (new) { | |
1183 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
1184 | goto err_out; | |
1185 | } | |
1186 | ||
1187 | if (skb->len) | |
97c53cac | 1188 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1189 | |
1190 | err_out: | |
1191 | kfree_skb(skb); | |
1192 | return -EINVAL; | |
1193 | } | |
1194 | ||
30723673 DM |
1195 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1196 | { | |
1197 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1198 | } | |
1199 | ||
1200 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, | |
1201 | struct netlink_callback *cb, | |
1202 | int *q_idx_p, int s_q_idx) | |
1203 | { | |
1204 | int ret = 0, q_idx = *q_idx_p; | |
1205 | struct Qdisc *q; | |
1206 | ||
1207 | if (!root) | |
1208 | return 0; | |
1209 | ||
1210 | q = root; | |
1211 | if (q_idx < s_q_idx) { | |
1212 | q_idx++; | |
1213 | } else { | |
1214 | if (!tc_qdisc_dump_ignore(q) && | |
1215 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1216 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1217 | goto done; | |
1218 | q_idx++; | |
1219 | } | |
1220 | list_for_each_entry(q, &root->list, list) { | |
1221 | if (q_idx < s_q_idx) { | |
1222 | q_idx++; | |
1223 | continue; | |
1224 | } | |
1225 | if (!tc_qdisc_dump_ignore(q) && | |
1226 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1227 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1228 | goto done; | |
1229 | q_idx++; | |
1230 | } | |
1231 | ||
1232 | out: | |
1233 | *q_idx_p = q_idx; | |
1234 | return ret; | |
1235 | done: | |
1236 | ret = -1; | |
1237 | goto out; | |
1238 | } | |
1239 | ||
1da177e4 LT |
1240 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1241 | { | |
3b1e0a65 | 1242 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1243 | int idx, q_idx; |
1244 | int s_idx, s_q_idx; | |
1245 | struct net_device *dev; | |
1da177e4 | 1246 | |
b854272b DL |
1247 | if (net != &init_net) |
1248 | return 0; | |
1249 | ||
1da177e4 LT |
1250 | s_idx = cb->args[0]; |
1251 | s_q_idx = q_idx = cb->args[1]; | |
1252 | read_lock(&dev_base_lock); | |
7562f876 | 1253 | idx = 0; |
881d966b | 1254 | for_each_netdev(&init_net, dev) { |
30723673 DM |
1255 | struct netdev_queue *dev_queue; |
1256 | ||
1da177e4 | 1257 | if (idx < s_idx) |
7562f876 | 1258 | goto cont; |
1da177e4 LT |
1259 | if (idx > s_idx) |
1260 | s_q_idx = 0; | |
1da177e4 | 1261 | q_idx = 0; |
30723673 DM |
1262 | |
1263 | dev_queue = netdev_get_tx_queue(dev, 0); | |
1264 | if (tc_dump_qdisc_root(dev_queue->qdisc, skb, cb, &q_idx, s_q_idx) < 0) | |
1265 | goto done; | |
1266 | ||
1267 | dev_queue = &dev->rx_queue; | |
1268 | if (tc_dump_qdisc_root(dev_queue->qdisc, skb, cb, &q_idx, s_q_idx) < 0) | |
1269 | goto done; | |
1270 | ||
7562f876 PE |
1271 | cont: |
1272 | idx++; | |
1da177e4 LT |
1273 | } |
1274 | ||
1275 | done: | |
1276 | read_unlock(&dev_base_lock); | |
1277 | ||
1278 | cb->args[0] = idx; | |
1279 | cb->args[1] = q_idx; | |
1280 | ||
1281 | return skb->len; | |
1282 | } | |
1283 | ||
1284 | ||
1285 | ||
1286 | /************************************************ | |
1287 | * Traffic classes manipulation. * | |
1288 | ************************************************/ | |
1289 | ||
1290 | ||
1291 | ||
1292 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1293 | { | |
3b1e0a65 | 1294 | struct net *net = sock_net(skb->sk); |
b0e1e646 | 1295 | struct netdev_queue *dev_queue; |
1da177e4 | 1296 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 1297 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1298 | struct net_device *dev; |
1299 | struct Qdisc *q = NULL; | |
20fea08b | 1300 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1301 | unsigned long cl = 0; |
1302 | unsigned long new_cl; | |
1303 | u32 pid = tcm->tcm_parent; | |
1304 | u32 clid = tcm->tcm_handle; | |
1305 | u32 qid = TC_H_MAJ(clid); | |
1306 | int err; | |
1307 | ||
b854272b DL |
1308 | if (net != &init_net) |
1309 | return -EINVAL; | |
1310 | ||
881d966b | 1311 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1312 | return -ENODEV; |
1313 | ||
1e90474c PM |
1314 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1315 | if (err < 0) | |
1316 | return err; | |
1317 | ||
1da177e4 LT |
1318 | /* |
1319 | parent == TC_H_UNSPEC - unspecified parent. | |
1320 | parent == TC_H_ROOT - class is root, which has no parent. | |
1321 | parent == X:0 - parent is root class. | |
1322 | parent == X:Y - parent is a node in hierarchy. | |
1323 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1324 | ||
1325 | handle == 0:0 - generate handle from kernel pool. | |
1326 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1327 | handle == X:Y - clear. | |
1328 | handle == X:0 - root class. | |
1329 | */ | |
1330 | ||
1331 | /* Step 1. Determine qdisc handle X:0 */ | |
1332 | ||
e8a0464c | 1333 | dev_queue = netdev_get_tx_queue(dev, 0); |
1da177e4 LT |
1334 | if (pid != TC_H_ROOT) { |
1335 | u32 qid1 = TC_H_MAJ(pid); | |
1336 | ||
1337 | if (qid && qid1) { | |
1338 | /* If both majors are known, they must be identical. */ | |
1339 | if (qid != qid1) | |
1340 | return -EINVAL; | |
1341 | } else if (qid1) { | |
1342 | qid = qid1; | |
1343 | } else if (qid == 0) | |
b0e1e646 | 1344 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1345 | |
1346 | /* Now qid is genuine qdisc handle consistent | |
1347 | both with parent and child. | |
1348 | ||
1349 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
1350 | */ | |
1351 | if (pid) | |
1352 | pid = TC_H_MAKE(qid, pid); | |
1353 | } else { | |
1354 | if (qid == 0) | |
b0e1e646 | 1355 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1356 | } |
1357 | ||
1358 | /* OK. Locate qdisc */ | |
10297b99 | 1359 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
1da177e4 LT |
1360 | return -ENOENT; |
1361 | ||
1362 | /* An check that it supports classes */ | |
1363 | cops = q->ops->cl_ops; | |
1364 | if (cops == NULL) | |
1365 | return -EINVAL; | |
1366 | ||
1367 | /* Now try to get class */ | |
1368 | if (clid == 0) { | |
1369 | if (pid == TC_H_ROOT) | |
1370 | clid = qid; | |
1371 | } else | |
1372 | clid = TC_H_MAKE(qid, clid); | |
1373 | ||
1374 | if (clid) | |
1375 | cl = cops->get(q, clid); | |
1376 | ||
1377 | if (cl == 0) { | |
1378 | err = -ENOENT; | |
1379 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
1380 | goto out; | |
1381 | } else { | |
1382 | switch (n->nlmsg_type) { | |
10297b99 | 1383 | case RTM_NEWTCLASS: |
1da177e4 LT |
1384 | err = -EEXIST; |
1385 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1386 | goto out; | |
1387 | break; | |
1388 | case RTM_DELTCLASS: | |
1389 | err = cops->delete(q, cl); | |
1390 | if (err == 0) | |
1391 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); | |
1392 | goto out; | |
1393 | case RTM_GETTCLASS: | |
1394 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); | |
1395 | goto out; | |
1396 | default: | |
1397 | err = -EINVAL; | |
1398 | goto out; | |
1399 | } | |
1400 | } | |
1401 | ||
1402 | new_cl = cl; | |
1403 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1404 | if (err == 0) | |
1405 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); | |
1406 | ||
1407 | out: | |
1408 | if (cl) | |
1409 | cops->put(q, cl); | |
1410 | ||
1411 | return err; | |
1412 | } | |
1413 | ||
1414 | ||
1415 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1416 | unsigned long cl, | |
e431b8c0 | 1417 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1418 | { |
1419 | struct tcmsg *tcm; | |
1420 | struct nlmsghdr *nlh; | |
27a884dc | 1421 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1422 | struct gnet_dump d; |
20fea08b | 1423 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1424 | |
e431b8c0 | 1425 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1426 | tcm = NLMSG_DATA(nlh); |
1427 | tcm->tcm_family = AF_UNSPEC; | |
5ce2d488 | 1428 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1429 | tcm->tcm_parent = q->handle; |
1430 | tcm->tcm_handle = q->handle; | |
1431 | tcm->tcm_info = 0; | |
57e1c487 | 1432 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1433 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1434 | goto nla_put_failure; |
1da177e4 LT |
1435 | |
1436 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, | |
7698b4fc | 1437 | TCA_XSTATS, qdisc_root_lock(q), &d) < 0) |
1e90474c | 1438 | goto nla_put_failure; |
1da177e4 LT |
1439 | |
1440 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1441 | goto nla_put_failure; |
1da177e4 LT |
1442 | |
1443 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1444 | goto nla_put_failure; |
1da177e4 | 1445 | |
27a884dc | 1446 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1447 | return skb->len; |
1448 | ||
1449 | nlmsg_failure: | |
1e90474c | 1450 | nla_put_failure: |
dc5fc579 | 1451 | nlmsg_trim(skb, b); |
1da177e4 LT |
1452 | return -1; |
1453 | } | |
1454 | ||
1455 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1456 | struct Qdisc *q, unsigned long cl, int event) | |
1457 | { | |
1458 | struct sk_buff *skb; | |
1459 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1460 | ||
1461 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1462 | if (!skb) | |
1463 | return -ENOBUFS; | |
1464 | ||
1465 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1466 | kfree_skb(skb); | |
1467 | return -EINVAL; | |
1468 | } | |
1469 | ||
97c53cac | 1470 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1471 | } |
1472 | ||
1473 | struct qdisc_dump_args | |
1474 | { | |
1475 | struct qdisc_walker w; | |
1476 | struct sk_buff *skb; | |
1477 | struct netlink_callback *cb; | |
1478 | }; | |
1479 | ||
1480 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1481 | { | |
1482 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1483 | ||
1484 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1485 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1486 | } | |
1487 | ||
30723673 DM |
1488 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1489 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1490 | int *t_p, int s_t) | |
1491 | { | |
1492 | struct qdisc_dump_args arg; | |
1493 | ||
1494 | if (tc_qdisc_dump_ignore(q) || | |
1495 | *t_p < s_t || !q->ops->cl_ops || | |
1496 | (tcm->tcm_parent && | |
1497 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1498 | (*t_p)++; | |
1499 | return 0; | |
1500 | } | |
1501 | if (*t_p > s_t) | |
1502 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1503 | arg.w.fn = qdisc_class_dump; | |
1504 | arg.skb = skb; | |
1505 | arg.cb = cb; | |
1506 | arg.w.stop = 0; | |
1507 | arg.w.skip = cb->args[1]; | |
1508 | arg.w.count = 0; | |
1509 | q->ops->cl_ops->walk(q, &arg.w); | |
1510 | cb->args[1] = arg.w.count; | |
1511 | if (arg.w.stop) | |
1512 | return -1; | |
1513 | (*t_p)++; | |
1514 | return 0; | |
1515 | } | |
1516 | ||
1517 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1518 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1519 | int *t_p, int s_t) | |
1520 | { | |
1521 | struct Qdisc *q; | |
1522 | ||
1523 | if (!root) | |
1524 | return 0; | |
1525 | ||
1526 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1527 | return -1; | |
1528 | ||
1529 | list_for_each_entry(q, &root->list, list) { | |
1530 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1531 | return -1; | |
1532 | } | |
1533 | ||
1534 | return 0; | |
1535 | } | |
1536 | ||
1da177e4 LT |
1537 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1538 | { | |
30723673 | 1539 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
3b1e0a65 | 1540 | struct net *net = sock_net(skb->sk); |
30723673 | 1541 | struct netdev_queue *dev_queue; |
1da177e4 | 1542 | struct net_device *dev; |
30723673 | 1543 | int t, s_t; |
1da177e4 | 1544 | |
b854272b DL |
1545 | if (net != &init_net) |
1546 | return 0; | |
1547 | ||
1da177e4 LT |
1548 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
1549 | return 0; | |
881d966b | 1550 | if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1551 | return 0; |
1552 | ||
1553 | s_t = cb->args[0]; | |
1554 | t = 0; | |
1555 | ||
30723673 DM |
1556 | dev_queue = netdev_get_tx_queue(dev, 0); |
1557 | if (tc_dump_tclass_root(dev_queue->qdisc, skb, tcm, cb, &t, s_t) < 0) | |
1558 | goto done; | |
1559 | ||
1560 | dev_queue = &dev->rx_queue; | |
1561 | if (tc_dump_tclass_root(dev_queue->qdisc, skb, tcm, cb, &t, s_t) < 0) | |
1562 | goto done; | |
1da177e4 | 1563 | |
30723673 | 1564 | done: |
1da177e4 LT |
1565 | cb->args[0] = t; |
1566 | ||
1567 | dev_put(dev); | |
1568 | return skb->len; | |
1569 | } | |
1570 | ||
1571 | /* Main classifier routine: scans classifier chain attached | |
1572 | to this qdisc, (optionally) tests for protocol and asks | |
1573 | specific classifiers. | |
1574 | */ | |
73ca4918 PM |
1575 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1576 | struct tcf_result *res) | |
1577 | { | |
1578 | __be16 protocol = skb->protocol; | |
1579 | int err = 0; | |
1580 | ||
1581 | for (; tp; tp = tp->next) { | |
1582 | if ((tp->protocol == protocol || | |
1583 | tp->protocol == htons(ETH_P_ALL)) && | |
1584 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1585 | #ifdef CONFIG_NET_CLS_ACT | |
1586 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1587 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1588 | #endif | |
1589 | return err; | |
1590 | } | |
1591 | } | |
1592 | return -1; | |
1593 | } | |
1594 | EXPORT_SYMBOL(tc_classify_compat); | |
1595 | ||
1da177e4 | 1596 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1597 | struct tcf_result *res) |
1da177e4 LT |
1598 | { |
1599 | int err = 0; | |
73ca4918 | 1600 | __be16 protocol; |
1da177e4 LT |
1601 | #ifdef CONFIG_NET_CLS_ACT |
1602 | struct tcf_proto *otp = tp; | |
1603 | reclassify: | |
1604 | #endif | |
1605 | protocol = skb->protocol; | |
1606 | ||
73ca4918 | 1607 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1608 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1609 | if (err == TC_ACT_RECLASSIFY) { |
1610 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1611 | tp = otp; | |
1612 | ||
1613 | if (verd++ >= MAX_REC_LOOP) { | |
1614 | printk("rule prio %u protocol %02x reclassify loop, " | |
1615 | "packet dropped\n", | |
1616 | tp->prio&0xffff, ntohs(tp->protocol)); | |
1617 | return TC_ACT_SHOT; | |
1da177e4 | 1618 | } |
73ca4918 PM |
1619 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1620 | goto reclassify; | |
1da177e4 | 1621 | } |
73ca4918 PM |
1622 | #endif |
1623 | return err; | |
1da177e4 | 1624 | } |
73ca4918 | 1625 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1626 | |
a48b5a61 PM |
1627 | void tcf_destroy(struct tcf_proto *tp) |
1628 | { | |
1629 | tp->ops->destroy(tp); | |
1630 | module_put(tp->ops->owner); | |
1631 | kfree(tp); | |
1632 | } | |
1633 | ||
ff31ab56 | 1634 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1635 | { |
1636 | struct tcf_proto *tp; | |
1637 | ||
ff31ab56 PM |
1638 | while ((tp = *fl) != NULL) { |
1639 | *fl = tp->next; | |
a48b5a61 PM |
1640 | tcf_destroy(tp); |
1641 | } | |
1642 | } | |
1643 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1644 | ||
1da177e4 LT |
1645 | #ifdef CONFIG_PROC_FS |
1646 | static int psched_show(struct seq_file *seq, void *v) | |
1647 | { | |
3c0cfc13 PM |
1648 | struct timespec ts; |
1649 | ||
1650 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1651 | seq_printf(seq, "%08x %08x %08x %08x\n", |
641b9e0e | 1652 | (u32)NSEC_PER_USEC, (u32)PSCHED_US2NS(1), |
514bca32 | 1653 | 1000000, |
3c0cfc13 | 1654 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1655 | |
1656 | return 0; | |
1657 | } | |
1658 | ||
1659 | static int psched_open(struct inode *inode, struct file *file) | |
1660 | { | |
1661 | return single_open(file, psched_show, PDE(inode)->data); | |
1662 | } | |
1663 | ||
da7071d7 | 1664 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1665 | .owner = THIS_MODULE, |
1666 | .open = psched_open, | |
1667 | .read = seq_read, | |
1668 | .llseek = seq_lseek, | |
1669 | .release = single_release, | |
10297b99 | 1670 | }; |
1da177e4 LT |
1671 | #endif |
1672 | ||
1da177e4 LT |
1673 | static int __init pktsched_init(void) |
1674 | { | |
1da177e4 LT |
1675 | register_qdisc(&pfifo_qdisc_ops); |
1676 | register_qdisc(&bfifo_qdisc_ops); | |
457c4cbc | 1677 | proc_net_fops_create(&init_net, "psched", 0, &psched_fops); |
1da177e4 | 1678 | |
be577ddc TG |
1679 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
1680 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); | |
1681 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); | |
1682 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); | |
1683 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); | |
1684 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); | |
1685 | ||
1da177e4 LT |
1686 | return 0; |
1687 | } | |
1688 | ||
1689 | subsys_initcall(pktsched_init); |