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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 | ||
8123b421 DM |
186 | struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
187 | { | |
188 | struct Qdisc *q; | |
189 | ||
190 | if (!(root->flags & TCQ_F_BUILTIN) && | |
191 | root->handle == handle) | |
192 | return root; | |
193 | ||
194 | list_for_each_entry(q, &root->list, list) { | |
195 | if (q->handle == handle) | |
196 | return q; | |
197 | } | |
198 | return NULL; | |
199 | } | |
200 | ||
ead81cc5 | 201 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 202 | { |
30723673 DM |
203 | unsigned int i; |
204 | ||
205 | for (i = 0; i < dev->num_tx_queues; i++) { | |
206 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
827ebd64 | 207 | struct Qdisc *q, *txq_root = txq->qdisc_sleeping; |
1da177e4 | 208 | |
8123b421 DM |
209 | q = qdisc_match_from_root(txq_root, handle); |
210 | if (q) | |
211 | return q; | |
1da177e4 | 212 | } |
8123b421 | 213 | return qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle); |
1da177e4 LT |
214 | } |
215 | ||
216 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
217 | { | |
218 | unsigned long cl; | |
219 | struct Qdisc *leaf; | |
20fea08b | 220 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
221 | |
222 | if (cops == NULL) | |
223 | return NULL; | |
224 | cl = cops->get(p, classid); | |
225 | ||
226 | if (cl == 0) | |
227 | return NULL; | |
228 | leaf = cops->leaf(p, cl); | |
229 | cops->put(p, cl); | |
230 | return leaf; | |
231 | } | |
232 | ||
233 | /* Find queueing discipline by name */ | |
234 | ||
1e90474c | 235 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
236 | { |
237 | struct Qdisc_ops *q = NULL; | |
238 | ||
239 | if (kind) { | |
240 | read_lock(&qdisc_mod_lock); | |
241 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 242 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
243 | if (!try_module_get(q->owner)) |
244 | q = NULL; | |
245 | break; | |
246 | } | |
247 | } | |
248 | read_unlock(&qdisc_mod_lock); | |
249 | } | |
250 | return q; | |
251 | } | |
252 | ||
253 | static struct qdisc_rate_table *qdisc_rtab_list; | |
254 | ||
1e90474c | 255 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
256 | { |
257 | struct qdisc_rate_table *rtab; | |
258 | ||
259 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
260 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
261 | rtab->refcnt++; | |
262 | return rtab; | |
263 | } | |
264 | } | |
265 | ||
5feb5e1a PM |
266 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
267 | nla_len(tab) != TC_RTAB_SIZE) | |
1da177e4 LT |
268 | return NULL; |
269 | ||
270 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
271 | if (rtab) { | |
272 | rtab->rate = *r; | |
273 | rtab->refcnt = 1; | |
1e90474c | 274 | memcpy(rtab->data, nla_data(tab), 1024); |
1da177e4 LT |
275 | rtab->next = qdisc_rtab_list; |
276 | qdisc_rtab_list = rtab; | |
277 | } | |
278 | return rtab; | |
279 | } | |
62e3ba1b | 280 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
281 | |
282 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
283 | { | |
284 | struct qdisc_rate_table *rtab, **rtabp; | |
285 | ||
286 | if (!tab || --tab->refcnt) | |
287 | return; | |
288 | ||
289 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
290 | if (rtab == tab) { | |
291 | *rtabp = rtab->next; | |
292 | kfree(rtab); | |
293 | return; | |
294 | } | |
295 | } | |
296 | } | |
62e3ba1b | 297 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 298 | |
175f9c1b JK |
299 | static LIST_HEAD(qdisc_stab_list); |
300 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
301 | ||
302 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
303 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
304 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
305 | }; | |
306 | ||
307 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
308 | { | |
309 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
310 | struct qdisc_size_table *stab; | |
311 | struct tc_sizespec *s; | |
312 | unsigned int tsize = 0; | |
313 | u16 *tab = NULL; | |
314 | int err; | |
315 | ||
316 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
317 | if (err < 0) | |
318 | return ERR_PTR(err); | |
319 | if (!tb[TCA_STAB_BASE]) | |
320 | return ERR_PTR(-EINVAL); | |
321 | ||
322 | s = nla_data(tb[TCA_STAB_BASE]); | |
323 | ||
324 | if (s->tsize > 0) { | |
325 | if (!tb[TCA_STAB_DATA]) | |
326 | return ERR_PTR(-EINVAL); | |
327 | tab = nla_data(tb[TCA_STAB_DATA]); | |
328 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
329 | } | |
330 | ||
331 | if (!s || tsize != s->tsize || (!tab && tsize > 0)) | |
332 | return ERR_PTR(-EINVAL); | |
333 | ||
1cfa2666 | 334 | spin_lock_bh(&qdisc_stab_lock); |
175f9c1b JK |
335 | |
336 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
337 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
338 | continue; | |
339 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
340 | continue; | |
341 | stab->refcnt++; | |
1cfa2666 | 342 | spin_unlock_bh(&qdisc_stab_lock); |
175f9c1b JK |
343 | return stab; |
344 | } | |
345 | ||
1cfa2666 | 346 | spin_unlock_bh(&qdisc_stab_lock); |
175f9c1b JK |
347 | |
348 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
349 | if (!stab) | |
350 | return ERR_PTR(-ENOMEM); | |
351 | ||
352 | stab->refcnt = 1; | |
353 | stab->szopts = *s; | |
354 | if (tsize > 0) | |
355 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
356 | ||
1cfa2666 | 357 | spin_lock_bh(&qdisc_stab_lock); |
175f9c1b | 358 | list_add_tail(&stab->list, &qdisc_stab_list); |
1cfa2666 | 359 | spin_unlock_bh(&qdisc_stab_lock); |
175f9c1b JK |
360 | |
361 | return stab; | |
362 | } | |
363 | ||
364 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
365 | { | |
366 | if (!tab) | |
367 | return; | |
368 | ||
1cfa2666 | 369 | spin_lock_bh(&qdisc_stab_lock); |
175f9c1b JK |
370 | |
371 | if (--tab->refcnt == 0) { | |
372 | list_del(&tab->list); | |
373 | kfree(tab); | |
374 | } | |
375 | ||
1cfa2666 | 376 | spin_unlock_bh(&qdisc_stab_lock); |
175f9c1b JK |
377 | } |
378 | EXPORT_SYMBOL(qdisc_put_stab); | |
379 | ||
380 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
381 | { | |
382 | struct nlattr *nest; | |
383 | ||
384 | nest = nla_nest_start(skb, TCA_STAB); | |
385 | NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); | |
386 | nla_nest_end(skb, nest); | |
387 | ||
388 | return skb->len; | |
389 | ||
390 | nla_put_failure: | |
391 | return -1; | |
392 | } | |
393 | ||
394 | void qdisc_calculate_pkt_len(struct sk_buff *skb, struct qdisc_size_table *stab) | |
395 | { | |
396 | int pkt_len, slot; | |
397 | ||
398 | pkt_len = skb->len + stab->szopts.overhead; | |
399 | if (unlikely(!stab->szopts.tsize)) | |
400 | goto out; | |
401 | ||
402 | slot = pkt_len + stab->szopts.cell_align; | |
403 | if (unlikely(slot < 0)) | |
404 | slot = 0; | |
405 | ||
406 | slot >>= stab->szopts.cell_log; | |
407 | if (likely(slot < stab->szopts.tsize)) | |
408 | pkt_len = stab->data[slot]; | |
409 | else | |
410 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
411 | (slot / stab->szopts.tsize) + | |
412 | stab->data[slot % stab->szopts.tsize]; | |
413 | ||
414 | pkt_len <<= stab->szopts.size_log; | |
415 | out: | |
416 | if (unlikely(pkt_len < 1)) | |
417 | pkt_len = 1; | |
418 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
419 | } | |
420 | EXPORT_SYMBOL(qdisc_calculate_pkt_len); | |
421 | ||
4179477f PM |
422 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
423 | { | |
424 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
425 | timer); | |
426 | ||
427 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
11274e5a | 428 | smp_wmb(); |
8608db03 | 429 | __netif_schedule(qdisc_root(wd->qdisc)); |
1936502d | 430 | |
4179477f PM |
431 | return HRTIMER_NORESTART; |
432 | } | |
433 | ||
434 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
435 | { | |
436 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
437 | wd->timer.function = qdisc_watchdog; | |
438 | wd->qdisc = qdisc; | |
439 | } | |
440 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
441 | ||
442 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
443 | { | |
444 | ktime_t time; | |
445 | ||
446 | wd->qdisc->flags |= TCQ_F_THROTTLED; | |
447 | time = ktime_set(0, 0); | |
448 | time = ktime_add_ns(time, PSCHED_US2NS(expires)); | |
449 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); | |
450 | } | |
451 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
452 | ||
453 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
454 | { | |
455 | hrtimer_cancel(&wd->timer); | |
456 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
457 | } | |
458 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 459 | |
a94f779f | 460 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
461 | { |
462 | unsigned int size = n * sizeof(struct hlist_head), i; | |
463 | struct hlist_head *h; | |
464 | ||
465 | if (size <= PAGE_SIZE) | |
466 | h = kmalloc(size, GFP_KERNEL); | |
467 | else | |
468 | h = (struct hlist_head *) | |
469 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
470 | ||
471 | if (h != NULL) { | |
472 | for (i = 0; i < n; i++) | |
473 | INIT_HLIST_HEAD(&h[i]); | |
474 | } | |
475 | return h; | |
476 | } | |
477 | ||
478 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
479 | { | |
480 | unsigned int size = n * sizeof(struct hlist_head); | |
481 | ||
482 | if (size <= PAGE_SIZE) | |
483 | kfree(h); | |
484 | else | |
485 | free_pages((unsigned long)h, get_order(size)); | |
486 | } | |
487 | ||
488 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
489 | { | |
490 | struct Qdisc_class_common *cl; | |
491 | struct hlist_node *n, *next; | |
492 | struct hlist_head *nhash, *ohash; | |
493 | unsigned int nsize, nmask, osize; | |
494 | unsigned int i, h; | |
495 | ||
496 | /* Rehash when load factor exceeds 0.75 */ | |
497 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
498 | return; | |
499 | nsize = clhash->hashsize * 2; | |
500 | nmask = nsize - 1; | |
501 | nhash = qdisc_class_hash_alloc(nsize); | |
502 | if (nhash == NULL) | |
503 | return; | |
504 | ||
505 | ohash = clhash->hash; | |
506 | osize = clhash->hashsize; | |
507 | ||
508 | sch_tree_lock(sch); | |
509 | for (i = 0; i < osize; i++) { | |
510 | hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) { | |
511 | h = qdisc_class_hash(cl->classid, nmask); | |
512 | hlist_add_head(&cl->hnode, &nhash[h]); | |
513 | } | |
514 | } | |
515 | clhash->hash = nhash; | |
516 | clhash->hashsize = nsize; | |
517 | clhash->hashmask = nmask; | |
518 | sch_tree_unlock(sch); | |
519 | ||
520 | qdisc_class_hash_free(ohash, osize); | |
521 | } | |
522 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
523 | ||
524 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
525 | { | |
526 | unsigned int size = 4; | |
527 | ||
528 | clhash->hash = qdisc_class_hash_alloc(size); | |
529 | if (clhash->hash == NULL) | |
530 | return -ENOMEM; | |
531 | clhash->hashsize = size; | |
532 | clhash->hashmask = size - 1; | |
533 | clhash->hashelems = 0; | |
534 | return 0; | |
535 | } | |
536 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
537 | ||
538 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
539 | { | |
540 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
541 | } | |
542 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
543 | ||
544 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
545 | struct Qdisc_class_common *cl) | |
546 | { | |
547 | unsigned int h; | |
548 | ||
549 | INIT_HLIST_NODE(&cl->hnode); | |
550 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
551 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
552 | clhash->hashelems++; | |
553 | } | |
554 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
555 | ||
556 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
557 | struct Qdisc_class_common *cl) | |
558 | { | |
559 | hlist_del(&cl->hnode); | |
560 | clhash->hashelems--; | |
561 | } | |
562 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
563 | ||
1da177e4 LT |
564 | /* Allocate an unique handle from space managed by kernel */ |
565 | ||
566 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
567 | { | |
568 | int i = 0x10000; | |
569 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
570 | ||
571 | do { | |
572 | autohandle += TC_H_MAKE(0x10000U, 0); | |
573 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
574 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
575 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
576 | ||
577 | return i>0 ? autohandle : 0; | |
578 | } | |
579 | ||
99194cff | 580 | /* Attach toplevel qdisc to device queue. */ |
1da177e4 | 581 | |
99194cff DM |
582 | static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
583 | struct Qdisc *qdisc) | |
1da177e4 | 584 | { |
8d50b53d | 585 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; |
53049978 | 586 | spinlock_t *root_lock; |
53049978 DM |
587 | |
588 | root_lock = qdisc_root_lock(oqdisc); | |
589 | spin_lock_bh(root_lock); | |
590 | ||
8d50b53d DM |
591 | /* Prune old scheduler */ |
592 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
593 | qdisc_reset(oqdisc); | |
1da177e4 | 594 | |
8d50b53d DM |
595 | /* ... and graft new one */ |
596 | if (qdisc == NULL) | |
597 | qdisc = &noop_qdisc; | |
598 | dev_queue->qdisc_sleeping = qdisc; | |
599 | dev_queue->qdisc = &noop_qdisc; | |
1da177e4 | 600 | |
53049978 | 601 | spin_unlock_bh(root_lock); |
1da177e4 | 602 | |
1da177e4 LT |
603 | return oqdisc; |
604 | } | |
605 | ||
43effa1e PM |
606 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
607 | { | |
20fea08b | 608 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
609 | unsigned long cl; |
610 | u32 parentid; | |
611 | ||
612 | if (n == 0) | |
613 | return; | |
614 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
615 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
616 | return; | |
617 | ||
5ce2d488 | 618 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
619 | if (sch == NULL) { |
620 | WARN_ON(parentid != TC_H_ROOT); | |
621 | return; | |
622 | } | |
43effa1e PM |
623 | cops = sch->ops->cl_ops; |
624 | if (cops->qlen_notify) { | |
625 | cl = cops->get(sch, parentid); | |
626 | cops->qlen_notify(sch, cl); | |
627 | cops->put(sch, cl); | |
628 | } | |
629 | sch->q.qlen -= n; | |
630 | } | |
631 | } | |
632 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 633 | |
99194cff DM |
634 | static void notify_and_destroy(struct sk_buff *skb, struct nlmsghdr *n, u32 clid, |
635 | struct Qdisc *old, struct Qdisc *new) | |
636 | { | |
637 | if (new || old) | |
638 | qdisc_notify(skb, n, clid, old, new); | |
1da177e4 | 639 | |
99194cff | 640 | if (old) { |
3a76e371 | 641 | sch_tree_lock(old); |
99194cff | 642 | qdisc_destroy(old); |
3a76e371 | 643 | sch_tree_unlock(old); |
99194cff DM |
644 | } |
645 | } | |
646 | ||
647 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
648 | * to device "dev". | |
649 | * | |
650 | * When appropriate send a netlink notification using 'skb' | |
651 | * and "n". | |
652 | * | |
653 | * On success, destroy old qdisc. | |
1da177e4 LT |
654 | */ |
655 | ||
656 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
657 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
658 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 659 | { |
99194cff | 660 | struct Qdisc *q = old; |
1da177e4 | 661 | int err = 0; |
1da177e4 | 662 | |
10297b99 | 663 | if (parent == NULL) { |
99194cff DM |
664 | unsigned int i, num_q, ingress; |
665 | ||
666 | ingress = 0; | |
667 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
668 | if ((q && q->flags & TCQ_F_INGRESS) || |
669 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
670 | num_q = 1; |
671 | ingress = 1; | |
672 | } | |
673 | ||
674 | if (dev->flags & IFF_UP) | |
675 | dev_deactivate(dev); | |
676 | ||
677 | for (i = 0; i < num_q; i++) { | |
678 | struct netdev_queue *dev_queue = &dev->rx_queue; | |
679 | ||
680 | if (!ingress) | |
681 | dev_queue = netdev_get_tx_queue(dev, i); | |
682 | ||
8d50b53d DM |
683 | old = dev_graft_qdisc(dev_queue, new); |
684 | if (new && i > 0) | |
685 | atomic_inc(&new->refcnt); | |
686 | ||
99194cff | 687 | notify_and_destroy(skb, n, classid, old, new); |
1da177e4 | 688 | } |
99194cff DM |
689 | |
690 | if (dev->flags & IFF_UP) | |
691 | dev_activate(dev); | |
1da177e4 | 692 | } else { |
20fea08b | 693 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 LT |
694 | |
695 | err = -EINVAL; | |
696 | ||
697 | if (cops) { | |
698 | unsigned long cl = cops->get(parent, classid); | |
699 | if (cl) { | |
99194cff | 700 | err = cops->graft(parent, cl, new, &old); |
1da177e4 LT |
701 | cops->put(parent, cl); |
702 | } | |
703 | } | |
99194cff DM |
704 | if (!err) |
705 | notify_and_destroy(skb, n, classid, old, new); | |
1da177e4 LT |
706 | } |
707 | return err; | |
708 | } | |
709 | ||
710 | /* | |
711 | Allocate and initialize new qdisc. | |
712 | ||
713 | Parameters are passed via opt. | |
714 | */ | |
715 | ||
716 | static struct Qdisc * | |
bb949fbd DM |
717 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
718 | u32 parent, u32 handle, struct nlattr **tca, int *errp) | |
1da177e4 LT |
719 | { |
720 | int err; | |
1e90474c | 721 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
722 | struct Qdisc *sch; |
723 | struct Qdisc_ops *ops; | |
175f9c1b | 724 | struct qdisc_size_table *stab; |
1da177e4 LT |
725 | |
726 | ops = qdisc_lookup_ops(kind); | |
727 | #ifdef CONFIG_KMOD | |
728 | if (ops == NULL && kind != NULL) { | |
729 | char name[IFNAMSIZ]; | |
1e90474c | 730 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
731 | /* We dropped the RTNL semaphore in order to |
732 | * perform the module load. So, even if we | |
733 | * succeeded in loading the module we have to | |
734 | * tell the caller to replay the request. We | |
735 | * indicate this using -EAGAIN. | |
736 | * We replay the request because the device may | |
737 | * go away in the mean time. | |
738 | */ | |
739 | rtnl_unlock(); | |
740 | request_module("sch_%s", name); | |
741 | rtnl_lock(); | |
742 | ops = qdisc_lookup_ops(kind); | |
743 | if (ops != NULL) { | |
744 | /* We will try again qdisc_lookup_ops, | |
745 | * so don't keep a reference. | |
746 | */ | |
747 | module_put(ops->owner); | |
748 | err = -EAGAIN; | |
749 | goto err_out; | |
750 | } | |
751 | } | |
752 | } | |
753 | #endif | |
754 | ||
b9e2cc0f | 755 | err = -ENOENT; |
1da177e4 LT |
756 | if (ops == NULL) |
757 | goto err_out; | |
758 | ||
5ce2d488 | 759 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
760 | if (IS_ERR(sch)) { |
761 | err = PTR_ERR(sch); | |
1da177e4 | 762 | goto err_out2; |
3d54b82f | 763 | } |
1da177e4 | 764 | |
ffc8fefa PM |
765 | sch->parent = parent; |
766 | ||
3d54b82f | 767 | if (handle == TC_H_INGRESS) { |
1da177e4 | 768 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 769 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
fd44de7c | 770 | } else { |
fd44de7c PM |
771 | if (handle == 0) { |
772 | handle = qdisc_alloc_handle(dev); | |
773 | err = -ENOMEM; | |
774 | if (handle == 0) | |
775 | goto err_out3; | |
776 | } | |
1da177e4 LT |
777 | } |
778 | ||
3d54b82f | 779 | sch->handle = handle; |
1da177e4 | 780 | |
1e90474c | 781 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
782 | if (tca[TCA_STAB]) { |
783 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
784 | if (IS_ERR(stab)) { | |
785 | err = PTR_ERR(stab); | |
786 | goto err_out3; | |
787 | } | |
788 | sch->stab = stab; | |
789 | } | |
1e90474c | 790 | if (tca[TCA_RATE]) { |
023e09a7 | 791 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
7698b4fc | 792 | qdisc_root_lock(sch), |
1e90474c | 793 | tca[TCA_RATE]); |
023e09a7 TG |
794 | if (err) { |
795 | /* | |
796 | * Any broken qdiscs that would require | |
797 | * a ops->reset() here? The qdisc was never | |
798 | * in action so it shouldn't be necessary. | |
799 | */ | |
800 | if (ops->destroy) | |
801 | ops->destroy(sch); | |
802 | goto err_out3; | |
803 | } | |
804 | } | |
ee7af826 | 805 | if ((parent != TC_H_ROOT) && !(sch->flags & TCQ_F_INGRESS)) |
827ebd64 | 806 | list_add_tail(&sch->list, &dev_queue->qdisc_sleeping->list); |
1da177e4 | 807 | |
1da177e4 LT |
808 | return sch; |
809 | } | |
810 | err_out3: | |
175f9c1b | 811 | qdisc_put_stab(sch->stab); |
1da177e4 | 812 | dev_put(dev); |
3d54b82f | 813 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
814 | err_out2: |
815 | module_put(ops->owner); | |
816 | err_out: | |
817 | *errp = err; | |
1da177e4 LT |
818 | return NULL; |
819 | } | |
820 | ||
1e90474c | 821 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 822 | { |
175f9c1b JK |
823 | struct qdisc_size_table *stab = NULL; |
824 | int err = 0; | |
1da177e4 | 825 | |
175f9c1b | 826 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
827 | if (sch->ops->change == NULL) |
828 | return -EINVAL; | |
1e90474c | 829 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
830 | if (err) |
831 | return err; | |
832 | } | |
175f9c1b JK |
833 | |
834 | if (tca[TCA_STAB]) { | |
835 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
836 | if (IS_ERR(stab)) | |
837 | return PTR_ERR(stab); | |
838 | } | |
839 | ||
840 | qdisc_put_stab(sch->stab); | |
841 | sch->stab = stab; | |
842 | ||
1e90474c | 843 | if (tca[TCA_RATE]) |
1da177e4 | 844 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
7698b4fc | 845 | qdisc_root_lock(sch), tca[TCA_RATE]); |
1da177e4 LT |
846 | return 0; |
847 | } | |
848 | ||
849 | struct check_loop_arg | |
850 | { | |
851 | struct qdisc_walker w; | |
852 | struct Qdisc *p; | |
853 | int depth; | |
854 | }; | |
855 | ||
856 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
857 | ||
858 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
859 | { | |
860 | struct check_loop_arg arg; | |
861 | ||
862 | if (q->ops->cl_ops == NULL) | |
863 | return 0; | |
864 | ||
865 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
866 | arg.w.fn = check_loop_fn; | |
867 | arg.depth = depth; | |
868 | arg.p = p; | |
869 | q->ops->cl_ops->walk(q, &arg.w); | |
870 | return arg.w.stop ? -ELOOP : 0; | |
871 | } | |
872 | ||
873 | static int | |
874 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
875 | { | |
876 | struct Qdisc *leaf; | |
20fea08b | 877 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
878 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
879 | ||
880 | leaf = cops->leaf(q, cl); | |
881 | if (leaf) { | |
882 | if (leaf == arg->p || arg->depth > 7) | |
883 | return -ELOOP; | |
884 | return check_loop(leaf, arg->p, arg->depth + 1); | |
885 | } | |
886 | return 0; | |
887 | } | |
888 | ||
889 | /* | |
890 | * Delete/get qdisc. | |
891 | */ | |
892 | ||
893 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
894 | { | |
3b1e0a65 | 895 | struct net *net = sock_net(skb->sk); |
1da177e4 | 896 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 897 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
898 | struct net_device *dev; |
899 | u32 clid = tcm->tcm_parent; | |
900 | struct Qdisc *q = NULL; | |
901 | struct Qdisc *p = NULL; | |
902 | int err; | |
903 | ||
b854272b DL |
904 | if (net != &init_net) |
905 | return -EINVAL; | |
906 | ||
881d966b | 907 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
908 | return -ENODEV; |
909 | ||
1e90474c PM |
910 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
911 | if (err < 0) | |
912 | return err; | |
913 | ||
1da177e4 LT |
914 | if (clid) { |
915 | if (clid != TC_H_ROOT) { | |
916 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
917 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
918 | return -ENOENT; | |
919 | q = qdisc_leaf(p, clid); | |
920 | } else { /* ingress */ | |
8123b421 | 921 | q = dev->rx_queue.qdisc_sleeping; |
10297b99 | 922 | } |
1da177e4 | 923 | } else { |
e8a0464c DM |
924 | struct netdev_queue *dev_queue; |
925 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 926 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
927 | } |
928 | if (!q) | |
929 | return -ENOENT; | |
930 | ||
931 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
932 | return -EINVAL; | |
933 | } else { | |
934 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
935 | return -ENOENT; | |
936 | } | |
937 | ||
1e90474c | 938 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
939 | return -EINVAL; |
940 | ||
941 | if (n->nlmsg_type == RTM_DELQDISC) { | |
942 | if (!clid) | |
943 | return -EINVAL; | |
944 | if (q->handle == 0) | |
945 | return -ENOENT; | |
99194cff | 946 | if ((err = qdisc_graft(dev, p, skb, n, clid, NULL, q)) != 0) |
1da177e4 | 947 | return err; |
1da177e4 LT |
948 | } else { |
949 | qdisc_notify(skb, n, clid, NULL, q); | |
950 | } | |
951 | return 0; | |
952 | } | |
953 | ||
954 | /* | |
955 | Create/change qdisc. | |
956 | */ | |
957 | ||
958 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
959 | { | |
3b1e0a65 | 960 | struct net *net = sock_net(skb->sk); |
1da177e4 | 961 | struct tcmsg *tcm; |
1e90474c | 962 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
963 | struct net_device *dev; |
964 | u32 clid; | |
965 | struct Qdisc *q, *p; | |
966 | int err; | |
967 | ||
b854272b DL |
968 | if (net != &init_net) |
969 | return -EINVAL; | |
970 | ||
1da177e4 LT |
971 | replay: |
972 | /* Reinit, just in case something touches this. */ | |
973 | tcm = NLMSG_DATA(n); | |
1da177e4 LT |
974 | clid = tcm->tcm_parent; |
975 | q = p = NULL; | |
976 | ||
881d966b | 977 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
978 | return -ENODEV; |
979 | ||
1e90474c PM |
980 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
981 | if (err < 0) | |
982 | return err; | |
983 | ||
1da177e4 LT |
984 | if (clid) { |
985 | if (clid != TC_H_ROOT) { | |
986 | if (clid != TC_H_INGRESS) { | |
987 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
988 | return -ENOENT; | |
989 | q = qdisc_leaf(p, clid); | |
990 | } else { /*ingress */ | |
8123b421 | 991 | q = dev->rx_queue.qdisc_sleeping; |
1da177e4 LT |
992 | } |
993 | } else { | |
e8a0464c DM |
994 | struct netdev_queue *dev_queue; |
995 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 996 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
997 | } |
998 | ||
999 | /* It may be default qdisc, ignore it */ | |
1000 | if (q && q->handle == 0) | |
1001 | q = NULL; | |
1002 | ||
1003 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1004 | if (tcm->tcm_handle) { | |
1005 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
1006 | return -EEXIST; | |
1007 | if (TC_H_MIN(tcm->tcm_handle)) | |
1008 | return -EINVAL; | |
1009 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
1010 | goto create_n_graft; | |
1011 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1012 | return -EEXIST; | |
1e90474c | 1013 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1014 | return -EINVAL; |
1015 | if (q == p || | |
1016 | (p && check_loop(q, p, 0))) | |
1017 | return -ELOOP; | |
1018 | atomic_inc(&q->refcnt); | |
1019 | goto graft; | |
1020 | } else { | |
1021 | if (q == NULL) | |
1022 | goto create_n_graft; | |
1023 | ||
1024 | /* This magic test requires explanation. | |
1025 | * | |
1026 | * We know, that some child q is already | |
1027 | * attached to this parent and have choice: | |
1028 | * either to change it or to create/graft new one. | |
1029 | * | |
1030 | * 1. We are allowed to create/graft only | |
1031 | * if CREATE and REPLACE flags are set. | |
1032 | * | |
1033 | * 2. If EXCL is set, requestor wanted to say, | |
1034 | * that qdisc tcm_handle is not expected | |
1035 | * to exist, so that we choose create/graft too. | |
1036 | * | |
1037 | * 3. The last case is when no flags are set. | |
1038 | * Alas, it is sort of hole in API, we | |
1039 | * cannot decide what to do unambiguously. | |
1040 | * For now we select create/graft, if | |
1041 | * user gave KIND, which does not match existing. | |
1042 | */ | |
1043 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
1044 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
1045 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
1e90474c PM |
1046 | (tca[TCA_KIND] && |
1047 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1048 | goto create_n_graft; |
1049 | } | |
1050 | } | |
1051 | } else { | |
1052 | if (!tcm->tcm_handle) | |
1053 | return -EINVAL; | |
1054 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1055 | } | |
1056 | ||
1057 | /* Change qdisc parameters */ | |
1058 | if (q == NULL) | |
1059 | return -ENOENT; | |
1060 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1061 | return -EEXIST; | |
1e90474c | 1062 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1063 | return -EINVAL; |
1064 | err = qdisc_change(q, tca); | |
1065 | if (err == 0) | |
1066 | qdisc_notify(skb, n, clid, NULL, q); | |
1067 | return err; | |
1068 | ||
1069 | create_n_graft: | |
1070 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
1071 | return -ENOENT; | |
1072 | if (clid == TC_H_INGRESS) | |
bb949fbd DM |
1073 | q = qdisc_create(dev, &dev->rx_queue, |
1074 | tcm->tcm_parent, tcm->tcm_parent, | |
ffc8fefa | 1075 | tca, &err); |
10297b99 | 1076 | else |
e8a0464c | 1077 | q = qdisc_create(dev, netdev_get_tx_queue(dev, 0), |
bb949fbd | 1078 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1079 | tca, &err); |
1da177e4 LT |
1080 | if (q == NULL) { |
1081 | if (err == -EAGAIN) | |
1082 | goto replay; | |
1083 | return err; | |
1084 | } | |
1085 | ||
1086 | graft: | |
1087 | if (1) { | |
53049978 DM |
1088 | spinlock_t *root_lock; |
1089 | ||
99194cff | 1090 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1da177e4 LT |
1091 | if (err) { |
1092 | if (q) { | |
53049978 DM |
1093 | root_lock = qdisc_root_lock(q); |
1094 | spin_lock_bh(root_lock); | |
1da177e4 | 1095 | qdisc_destroy(q); |
53049978 | 1096 | spin_unlock_bh(root_lock); |
1da177e4 LT |
1097 | } |
1098 | return err; | |
1099 | } | |
1da177e4 LT |
1100 | } |
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 1105 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1106 | { |
1107 | struct tcmsg *tcm; | |
1108 | struct nlmsghdr *nlh; | |
27a884dc | 1109 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1110 | struct gnet_dump d; |
1111 | ||
e431b8c0 | 1112 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1113 | tcm = NLMSG_DATA(nlh); |
1114 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1115 | tcm->tcm__pad1 = 0; |
1116 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1117 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1118 | tcm->tcm_parent = clid; |
1119 | tcm->tcm_handle = q->handle; | |
1120 | tcm->tcm_info = atomic_read(&q->refcnt); | |
57e1c487 | 1121 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1122 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1123 | goto nla_put_failure; |
1da177e4 LT |
1124 | q->qstats.qlen = q->q.qlen; |
1125 | ||
175f9c1b JK |
1126 | if (q->stab && qdisc_dump_stab(skb, q->stab) < 0) |
1127 | goto nla_put_failure; | |
1128 | ||
1da177e4 | 1129 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, |
7698b4fc | 1130 | TCA_XSTATS, qdisc_root_lock(q), &d) < 0) |
1e90474c | 1131 | goto nla_put_failure; |
1da177e4 LT |
1132 | |
1133 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1134 | goto nla_put_failure; |
1da177e4 LT |
1135 | |
1136 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
1da177e4 | 1137 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
1da177e4 | 1138 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1139 | goto nla_put_failure; |
10297b99 | 1140 | |
1da177e4 | 1141 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1142 | goto nla_put_failure; |
10297b99 | 1143 | |
27a884dc | 1144 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1145 | return skb->len; |
1146 | ||
1147 | nlmsg_failure: | |
1e90474c | 1148 | nla_put_failure: |
dc5fc579 | 1149 | nlmsg_trim(skb, b); |
1da177e4 LT |
1150 | return -1; |
1151 | } | |
1152 | ||
1153 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1154 | u32 clid, struct Qdisc *old, struct Qdisc *new) | |
1155 | { | |
1156 | struct sk_buff *skb; | |
1157 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1158 | ||
1159 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1160 | if (!skb) | |
1161 | return -ENOBUFS; | |
1162 | ||
1163 | if (old && old->handle) { | |
1164 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) | |
1165 | goto err_out; | |
1166 | } | |
1167 | if (new) { | |
1168 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
1169 | goto err_out; | |
1170 | } | |
1171 | ||
1172 | if (skb->len) | |
97c53cac | 1173 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1174 | |
1175 | err_out: | |
1176 | kfree_skb(skb); | |
1177 | return -EINVAL; | |
1178 | } | |
1179 | ||
30723673 DM |
1180 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1181 | { | |
1182 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1183 | } | |
1184 | ||
1185 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, | |
1186 | struct netlink_callback *cb, | |
1187 | int *q_idx_p, int s_q_idx) | |
1188 | { | |
1189 | int ret = 0, q_idx = *q_idx_p; | |
1190 | struct Qdisc *q; | |
1191 | ||
1192 | if (!root) | |
1193 | return 0; | |
1194 | ||
1195 | q = root; | |
1196 | if (q_idx < s_q_idx) { | |
1197 | q_idx++; | |
1198 | } else { | |
1199 | if (!tc_qdisc_dump_ignore(q) && | |
1200 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1201 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1202 | goto done; | |
1203 | q_idx++; | |
1204 | } | |
1205 | list_for_each_entry(q, &root->list, list) { | |
1206 | if (q_idx < s_q_idx) { | |
1207 | q_idx++; | |
1208 | continue; | |
1209 | } | |
1210 | if (!tc_qdisc_dump_ignore(q) && | |
1211 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1212 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1213 | goto done; | |
1214 | q_idx++; | |
1215 | } | |
1216 | ||
1217 | out: | |
1218 | *q_idx_p = q_idx; | |
1219 | return ret; | |
1220 | done: | |
1221 | ret = -1; | |
1222 | goto out; | |
1223 | } | |
1224 | ||
1da177e4 LT |
1225 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1226 | { | |
3b1e0a65 | 1227 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1228 | int idx, q_idx; |
1229 | int s_idx, s_q_idx; | |
1230 | struct net_device *dev; | |
1da177e4 | 1231 | |
b854272b DL |
1232 | if (net != &init_net) |
1233 | return 0; | |
1234 | ||
1da177e4 LT |
1235 | s_idx = cb->args[0]; |
1236 | s_q_idx = q_idx = cb->args[1]; | |
1237 | read_lock(&dev_base_lock); | |
7562f876 | 1238 | idx = 0; |
881d966b | 1239 | for_each_netdev(&init_net, dev) { |
30723673 DM |
1240 | struct netdev_queue *dev_queue; |
1241 | ||
1da177e4 | 1242 | if (idx < s_idx) |
7562f876 | 1243 | goto cont; |
1da177e4 LT |
1244 | if (idx > s_idx) |
1245 | s_q_idx = 0; | |
1da177e4 | 1246 | q_idx = 0; |
30723673 DM |
1247 | |
1248 | dev_queue = netdev_get_tx_queue(dev, 0); | |
827ebd64 | 1249 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1250 | goto done; |
1251 | ||
1252 | dev_queue = &dev->rx_queue; | |
827ebd64 | 1253 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1254 | goto done; |
1255 | ||
7562f876 PE |
1256 | cont: |
1257 | idx++; | |
1da177e4 LT |
1258 | } |
1259 | ||
1260 | done: | |
1261 | read_unlock(&dev_base_lock); | |
1262 | ||
1263 | cb->args[0] = idx; | |
1264 | cb->args[1] = q_idx; | |
1265 | ||
1266 | return skb->len; | |
1267 | } | |
1268 | ||
1269 | ||
1270 | ||
1271 | /************************************************ | |
1272 | * Traffic classes manipulation. * | |
1273 | ************************************************/ | |
1274 | ||
1275 | ||
1276 | ||
1277 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1278 | { | |
3b1e0a65 | 1279 | struct net *net = sock_net(skb->sk); |
b0e1e646 | 1280 | struct netdev_queue *dev_queue; |
1da177e4 | 1281 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 1282 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1283 | struct net_device *dev; |
1284 | struct Qdisc *q = NULL; | |
20fea08b | 1285 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1286 | unsigned long cl = 0; |
1287 | unsigned long new_cl; | |
1288 | u32 pid = tcm->tcm_parent; | |
1289 | u32 clid = tcm->tcm_handle; | |
1290 | u32 qid = TC_H_MAJ(clid); | |
1291 | int err; | |
1292 | ||
b854272b DL |
1293 | if (net != &init_net) |
1294 | return -EINVAL; | |
1295 | ||
881d966b | 1296 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1297 | return -ENODEV; |
1298 | ||
1e90474c PM |
1299 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1300 | if (err < 0) | |
1301 | return err; | |
1302 | ||
1da177e4 LT |
1303 | /* |
1304 | parent == TC_H_UNSPEC - unspecified parent. | |
1305 | parent == TC_H_ROOT - class is root, which has no parent. | |
1306 | parent == X:0 - parent is root class. | |
1307 | parent == X:Y - parent is a node in hierarchy. | |
1308 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1309 | ||
1310 | handle == 0:0 - generate handle from kernel pool. | |
1311 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1312 | handle == X:Y - clear. | |
1313 | handle == X:0 - root class. | |
1314 | */ | |
1315 | ||
1316 | /* Step 1. Determine qdisc handle X:0 */ | |
1317 | ||
e8a0464c | 1318 | dev_queue = netdev_get_tx_queue(dev, 0); |
1da177e4 LT |
1319 | if (pid != TC_H_ROOT) { |
1320 | u32 qid1 = TC_H_MAJ(pid); | |
1321 | ||
1322 | if (qid && qid1) { | |
1323 | /* If both majors are known, they must be identical. */ | |
1324 | if (qid != qid1) | |
1325 | return -EINVAL; | |
1326 | } else if (qid1) { | |
1327 | qid = qid1; | |
1328 | } else if (qid == 0) | |
b0e1e646 | 1329 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1330 | |
1331 | /* Now qid is genuine qdisc handle consistent | |
1332 | both with parent and child. | |
1333 | ||
1334 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
1335 | */ | |
1336 | if (pid) | |
1337 | pid = TC_H_MAKE(qid, pid); | |
1338 | } else { | |
1339 | if (qid == 0) | |
b0e1e646 | 1340 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1341 | } |
1342 | ||
1343 | /* OK. Locate qdisc */ | |
10297b99 | 1344 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
1da177e4 LT |
1345 | return -ENOENT; |
1346 | ||
1347 | /* An check that it supports classes */ | |
1348 | cops = q->ops->cl_ops; | |
1349 | if (cops == NULL) | |
1350 | return -EINVAL; | |
1351 | ||
1352 | /* Now try to get class */ | |
1353 | if (clid == 0) { | |
1354 | if (pid == TC_H_ROOT) | |
1355 | clid = qid; | |
1356 | } else | |
1357 | clid = TC_H_MAKE(qid, clid); | |
1358 | ||
1359 | if (clid) | |
1360 | cl = cops->get(q, clid); | |
1361 | ||
1362 | if (cl == 0) { | |
1363 | err = -ENOENT; | |
1364 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
1365 | goto out; | |
1366 | } else { | |
1367 | switch (n->nlmsg_type) { | |
10297b99 | 1368 | case RTM_NEWTCLASS: |
1da177e4 LT |
1369 | err = -EEXIST; |
1370 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1371 | goto out; | |
1372 | break; | |
1373 | case RTM_DELTCLASS: | |
1374 | err = cops->delete(q, cl); | |
1375 | if (err == 0) | |
1376 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); | |
1377 | goto out; | |
1378 | case RTM_GETTCLASS: | |
1379 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); | |
1380 | goto out; | |
1381 | default: | |
1382 | err = -EINVAL; | |
1383 | goto out; | |
1384 | } | |
1385 | } | |
1386 | ||
1387 | new_cl = cl; | |
1388 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1389 | if (err == 0) | |
1390 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); | |
1391 | ||
1392 | out: | |
1393 | if (cl) | |
1394 | cops->put(q, cl); | |
1395 | ||
1396 | return err; | |
1397 | } | |
1398 | ||
1399 | ||
1400 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1401 | unsigned long cl, | |
e431b8c0 | 1402 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1403 | { |
1404 | struct tcmsg *tcm; | |
1405 | struct nlmsghdr *nlh; | |
27a884dc | 1406 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1407 | struct gnet_dump d; |
20fea08b | 1408 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1409 | |
e431b8c0 | 1410 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1411 | tcm = NLMSG_DATA(nlh); |
1412 | tcm->tcm_family = AF_UNSPEC; | |
5ce2d488 | 1413 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1414 | tcm->tcm_parent = q->handle; |
1415 | tcm->tcm_handle = q->handle; | |
1416 | tcm->tcm_info = 0; | |
57e1c487 | 1417 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1418 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1419 | goto nla_put_failure; |
1da177e4 LT |
1420 | |
1421 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, | |
7698b4fc | 1422 | TCA_XSTATS, qdisc_root_lock(q), &d) < 0) |
1e90474c | 1423 | goto nla_put_failure; |
1da177e4 LT |
1424 | |
1425 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1426 | goto nla_put_failure; |
1da177e4 LT |
1427 | |
1428 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1429 | goto nla_put_failure; |
1da177e4 | 1430 | |
27a884dc | 1431 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1432 | return skb->len; |
1433 | ||
1434 | nlmsg_failure: | |
1e90474c | 1435 | nla_put_failure: |
dc5fc579 | 1436 | nlmsg_trim(skb, b); |
1da177e4 LT |
1437 | return -1; |
1438 | } | |
1439 | ||
1440 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1441 | struct Qdisc *q, unsigned long cl, int event) | |
1442 | { | |
1443 | struct sk_buff *skb; | |
1444 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1445 | ||
1446 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1447 | if (!skb) | |
1448 | return -ENOBUFS; | |
1449 | ||
1450 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1451 | kfree_skb(skb); | |
1452 | return -EINVAL; | |
1453 | } | |
1454 | ||
97c53cac | 1455 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1456 | } |
1457 | ||
1458 | struct qdisc_dump_args | |
1459 | { | |
1460 | struct qdisc_walker w; | |
1461 | struct sk_buff *skb; | |
1462 | struct netlink_callback *cb; | |
1463 | }; | |
1464 | ||
1465 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1466 | { | |
1467 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1468 | ||
1469 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1470 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1471 | } | |
1472 | ||
30723673 DM |
1473 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1474 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1475 | int *t_p, int s_t) | |
1476 | { | |
1477 | struct qdisc_dump_args arg; | |
1478 | ||
1479 | if (tc_qdisc_dump_ignore(q) || | |
1480 | *t_p < s_t || !q->ops->cl_ops || | |
1481 | (tcm->tcm_parent && | |
1482 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1483 | (*t_p)++; | |
1484 | return 0; | |
1485 | } | |
1486 | if (*t_p > s_t) | |
1487 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1488 | arg.w.fn = qdisc_class_dump; | |
1489 | arg.skb = skb; | |
1490 | arg.cb = cb; | |
1491 | arg.w.stop = 0; | |
1492 | arg.w.skip = cb->args[1]; | |
1493 | arg.w.count = 0; | |
1494 | q->ops->cl_ops->walk(q, &arg.w); | |
1495 | cb->args[1] = arg.w.count; | |
1496 | if (arg.w.stop) | |
1497 | return -1; | |
1498 | (*t_p)++; | |
1499 | return 0; | |
1500 | } | |
1501 | ||
1502 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1503 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1504 | int *t_p, int s_t) | |
1505 | { | |
1506 | struct Qdisc *q; | |
1507 | ||
1508 | if (!root) | |
1509 | return 0; | |
1510 | ||
1511 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1512 | return -1; | |
1513 | ||
1514 | list_for_each_entry(q, &root->list, list) { | |
1515 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1516 | return -1; | |
1517 | } | |
1518 | ||
1519 | return 0; | |
1520 | } | |
1521 | ||
1da177e4 LT |
1522 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1523 | { | |
30723673 | 1524 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
3b1e0a65 | 1525 | struct net *net = sock_net(skb->sk); |
30723673 | 1526 | struct netdev_queue *dev_queue; |
1da177e4 | 1527 | struct net_device *dev; |
30723673 | 1528 | int t, s_t; |
1da177e4 | 1529 | |
b854272b DL |
1530 | if (net != &init_net) |
1531 | return 0; | |
1532 | ||
1da177e4 LT |
1533 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
1534 | return 0; | |
881d966b | 1535 | if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1536 | return 0; |
1537 | ||
1538 | s_t = cb->args[0]; | |
1539 | t = 0; | |
1540 | ||
30723673 | 1541 | dev_queue = netdev_get_tx_queue(dev, 0); |
8123b421 | 1542 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1543 | goto done; |
1544 | ||
1545 | dev_queue = &dev->rx_queue; | |
8123b421 | 1546 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 | 1547 | goto done; |
1da177e4 | 1548 | |
30723673 | 1549 | done: |
1da177e4 LT |
1550 | cb->args[0] = t; |
1551 | ||
1552 | dev_put(dev); | |
1553 | return skb->len; | |
1554 | } | |
1555 | ||
1556 | /* Main classifier routine: scans classifier chain attached | |
1557 | to this qdisc, (optionally) tests for protocol and asks | |
1558 | specific classifiers. | |
1559 | */ | |
73ca4918 PM |
1560 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1561 | struct tcf_result *res) | |
1562 | { | |
1563 | __be16 protocol = skb->protocol; | |
1564 | int err = 0; | |
1565 | ||
1566 | for (; tp; tp = tp->next) { | |
1567 | if ((tp->protocol == protocol || | |
1568 | tp->protocol == htons(ETH_P_ALL)) && | |
1569 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1570 | #ifdef CONFIG_NET_CLS_ACT | |
1571 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1572 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1573 | #endif | |
1574 | return err; | |
1575 | } | |
1576 | } | |
1577 | return -1; | |
1578 | } | |
1579 | EXPORT_SYMBOL(tc_classify_compat); | |
1580 | ||
1da177e4 | 1581 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1582 | struct tcf_result *res) |
1da177e4 LT |
1583 | { |
1584 | int err = 0; | |
73ca4918 | 1585 | __be16 protocol; |
1da177e4 LT |
1586 | #ifdef CONFIG_NET_CLS_ACT |
1587 | struct tcf_proto *otp = tp; | |
1588 | reclassify: | |
1589 | #endif | |
1590 | protocol = skb->protocol; | |
1591 | ||
73ca4918 | 1592 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1593 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1594 | if (err == TC_ACT_RECLASSIFY) { |
1595 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1596 | tp = otp; | |
1597 | ||
1598 | if (verd++ >= MAX_REC_LOOP) { | |
1599 | printk("rule prio %u protocol %02x reclassify loop, " | |
1600 | "packet dropped\n", | |
1601 | tp->prio&0xffff, ntohs(tp->protocol)); | |
1602 | return TC_ACT_SHOT; | |
1da177e4 | 1603 | } |
73ca4918 PM |
1604 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1605 | goto reclassify; | |
1da177e4 | 1606 | } |
73ca4918 PM |
1607 | #endif |
1608 | return err; | |
1da177e4 | 1609 | } |
73ca4918 | 1610 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1611 | |
a48b5a61 PM |
1612 | void tcf_destroy(struct tcf_proto *tp) |
1613 | { | |
1614 | tp->ops->destroy(tp); | |
1615 | module_put(tp->ops->owner); | |
1616 | kfree(tp); | |
1617 | } | |
1618 | ||
ff31ab56 | 1619 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1620 | { |
1621 | struct tcf_proto *tp; | |
1622 | ||
ff31ab56 PM |
1623 | while ((tp = *fl) != NULL) { |
1624 | *fl = tp->next; | |
a48b5a61 PM |
1625 | tcf_destroy(tp); |
1626 | } | |
1627 | } | |
1628 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1629 | ||
1da177e4 LT |
1630 | #ifdef CONFIG_PROC_FS |
1631 | static int psched_show(struct seq_file *seq, void *v) | |
1632 | { | |
3c0cfc13 PM |
1633 | struct timespec ts; |
1634 | ||
1635 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1636 | seq_printf(seq, "%08x %08x %08x %08x\n", |
641b9e0e | 1637 | (u32)NSEC_PER_USEC, (u32)PSCHED_US2NS(1), |
514bca32 | 1638 | 1000000, |
3c0cfc13 | 1639 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1640 | |
1641 | return 0; | |
1642 | } | |
1643 | ||
1644 | static int psched_open(struct inode *inode, struct file *file) | |
1645 | { | |
1646 | return single_open(file, psched_show, PDE(inode)->data); | |
1647 | } | |
1648 | ||
da7071d7 | 1649 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1650 | .owner = THIS_MODULE, |
1651 | .open = psched_open, | |
1652 | .read = seq_read, | |
1653 | .llseek = seq_lseek, | |
1654 | .release = single_release, | |
10297b99 | 1655 | }; |
1da177e4 LT |
1656 | #endif |
1657 | ||
1da177e4 LT |
1658 | static int __init pktsched_init(void) |
1659 | { | |
1da177e4 LT |
1660 | register_qdisc(&pfifo_qdisc_ops); |
1661 | register_qdisc(&bfifo_qdisc_ops); | |
457c4cbc | 1662 | proc_net_fops_create(&init_net, "psched", 0, &psched_fops); |
1da177e4 | 1663 | |
be577ddc TG |
1664 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
1665 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); | |
1666 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); | |
1667 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); | |
1668 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); | |
1669 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); | |
1670 | ||
1da177e4 LT |
1671 | return 0; |
1672 | } | |
1673 | ||
1674 | subsys_initcall(pktsched_init); |