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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_api.c Packet scheduler API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Fixes: | |
12 | * | |
13 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. | |
14 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
15 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
1da177e4 | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/errno.h> |
1da177e4 | 23 | #include <linux/skbuff.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/proc_fs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/list.h> | |
4179477f | 29 | #include <linux/hrtimer.h> |
25bfcd5a | 30 | #include <linux/lockdep.h> |
1da177e4 | 31 | |
457c4cbc | 32 | #include <net/net_namespace.h> |
b854272b | 33 | #include <net/sock.h> |
dc5fc579 | 34 | #include <net/netlink.h> |
1da177e4 LT |
35 | #include <net/pkt_sched.h> |
36 | ||
1da177e4 LT |
37 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, u32 clid, |
38 | struct Qdisc *old, struct Qdisc *new); | |
39 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
40 | struct Qdisc *q, unsigned long cl, int event); | |
41 | ||
42 | /* | |
43 | ||
44 | Short review. | |
45 | ------------- | |
46 | ||
47 | This file consists of two interrelated parts: | |
48 | ||
49 | 1. queueing disciplines manager frontend. | |
50 | 2. traffic classes manager frontend. | |
51 | ||
52 | Generally, queueing discipline ("qdisc") is a black box, | |
53 | which is able to enqueue packets and to dequeue them (when | |
54 | device is ready to send something) in order and at times | |
55 | determined by algorithm hidden in it. | |
56 | ||
57 | qdisc's are divided to two categories: | |
58 | - "queues", which have no internal structure visible from outside. | |
59 | - "schedulers", which split all the packets to "traffic classes", | |
60 | using "packet classifiers" (look at cls_api.c) | |
61 | ||
62 | In turn, classes may have child qdiscs (as rule, queues) | |
63 | attached to them etc. etc. etc. | |
64 | ||
65 | The goal of the routines in this file is to translate | |
66 | information supplied by user in the form of handles | |
67 | to more intelligible for kernel form, to make some sanity | |
68 | checks and part of work, which is common to all qdiscs | |
69 | and to provide rtnetlink notifications. | |
70 | ||
71 | All real intelligent work is done inside qdisc modules. | |
72 | ||
73 | ||
74 | ||
75 | Every discipline has two major routines: enqueue and dequeue. | |
76 | ||
77 | ---dequeue | |
78 | ||
79 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
80 | but it does not mean that queue is empty, it just means that | |
81 | discipline does not want to send anything this time. | |
82 | Queue is really empty if q->q.qlen == 0. | |
83 | For complicated disciplines with multiple queues q->q is not | |
84 | real packet queue, but however q->q.qlen must be valid. | |
85 | ||
86 | ---enqueue | |
87 | ||
88 | enqueue returns 0, if packet was enqueued successfully. | |
89 | If packet (this one or another one) was dropped, it returns | |
90 | not zero error code. | |
91 | NET_XMIT_DROP - this packet dropped | |
92 | Expected action: do not backoff, but wait until queue will clear. | |
93 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
94 | Expected action: backoff or ignore | |
95 | NET_XMIT_POLICED - dropped by police. | |
96 | Expected action: backoff or error to real-time apps. | |
97 | ||
98 | Auxiliary routines: | |
99 | ||
100 | ---requeue | |
101 | ||
102 | requeues once dequeued packet. It is used for non-standard or | |
e65d22e1 | 103 | just buggy devices, which can defer output even if netif_queue_stopped()=0. |
1da177e4 LT |
104 | |
105 | ---reset | |
106 | ||
107 | returns qdisc to initial state: purge all buffers, clear all | |
108 | timers, counters (except for statistics) etc. | |
109 | ||
110 | ---init | |
111 | ||
112 | initializes newly created qdisc. | |
113 | ||
114 | ---destroy | |
115 | ||
116 | destroys resources allocated by init and during lifetime of qdisc. | |
117 | ||
118 | ---change | |
119 | ||
120 | changes qdisc parameters. | |
121 | */ | |
122 | ||
123 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
124 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
125 | ||
126 | ||
127 | /************************************************ | |
128 | * Queueing disciplines manipulation. * | |
129 | ************************************************/ | |
130 | ||
131 | ||
132 | /* The list of all installed queueing disciplines. */ | |
133 | ||
134 | static struct Qdisc_ops *qdisc_base; | |
135 | ||
136 | /* Register/uregister queueing discipline */ | |
137 | ||
138 | int register_qdisc(struct Qdisc_ops *qops) | |
139 | { | |
140 | struct Qdisc_ops *q, **qp; | |
141 | int rc = -EEXIST; | |
142 | ||
143 | write_lock(&qdisc_mod_lock); | |
144 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
145 | if (!strcmp(qops->id, q->id)) | |
146 | goto out; | |
147 | ||
148 | if (qops->enqueue == NULL) | |
149 | qops->enqueue = noop_qdisc_ops.enqueue; | |
150 | if (qops->requeue == NULL) | |
151 | qops->requeue = noop_qdisc_ops.requeue; | |
152 | if (qops->dequeue == NULL) | |
153 | qops->dequeue = noop_qdisc_ops.dequeue; | |
154 | ||
155 | qops->next = NULL; | |
156 | *qp = qops; | |
157 | rc = 0; | |
158 | out: | |
159 | write_unlock(&qdisc_mod_lock); | |
160 | return rc; | |
161 | } | |
62e3ba1b | 162 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
163 | |
164 | int unregister_qdisc(struct Qdisc_ops *qops) | |
165 | { | |
166 | struct Qdisc_ops *q, **qp; | |
167 | int err = -ENOENT; | |
168 | ||
169 | write_lock(&qdisc_mod_lock); | |
170 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) | |
171 | if (q == qops) | |
172 | break; | |
173 | if (q) { | |
174 | *qp = q->next; | |
175 | q->next = NULL; | |
176 | err = 0; | |
177 | } | |
178 | write_unlock(&qdisc_mod_lock); | |
179 | return err; | |
180 | } | |
62e3ba1b | 181 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 LT |
182 | |
183 | /* We know handle. Find qdisc among all qdisc's attached to device | |
184 | (root qdisc, all its children, children of children etc.) | |
185 | */ | |
186 | ||
8123b421 DM |
187 | struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
188 | { | |
189 | struct Qdisc *q; | |
190 | ||
191 | if (!(root->flags & TCQ_F_BUILTIN) && | |
192 | root->handle == handle) | |
193 | return root; | |
194 | ||
195 | list_for_each_entry(q, &root->list, list) { | |
196 | if (q->handle == handle) | |
197 | return q; | |
198 | } | |
199 | return NULL; | |
200 | } | |
201 | ||
f6e0b239 JP |
202 | /* |
203 | * This lock is needed until some qdiscs stop calling qdisc_tree_decrease_qlen() | |
204 | * without rtnl_lock(); currently hfsc_dequeue(), netem_dequeue(), tbf_dequeue() | |
205 | */ | |
206 | static DEFINE_SPINLOCK(qdisc_list_lock); | |
207 | ||
208 | static void qdisc_list_add(struct Qdisc *q) | |
209 | { | |
210 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { | |
211 | spin_lock_bh(&qdisc_list_lock); | |
212 | list_add_tail(&q->list, &qdisc_root_sleeping(q)->list); | |
213 | spin_unlock_bh(&qdisc_list_lock); | |
214 | } | |
215 | } | |
216 | ||
217 | void qdisc_list_del(struct Qdisc *q) | |
218 | { | |
219 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { | |
220 | spin_lock_bh(&qdisc_list_lock); | |
221 | list_del(&q->list); | |
222 | spin_unlock_bh(&qdisc_list_lock); | |
223 | } | |
224 | } | |
225 | EXPORT_SYMBOL(qdisc_list_del); | |
226 | ||
ead81cc5 | 227 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 228 | { |
30723673 | 229 | unsigned int i; |
f6e0b239 JP |
230 | struct Qdisc *q; |
231 | ||
232 | spin_lock_bh(&qdisc_list_lock); | |
30723673 DM |
233 | |
234 | for (i = 0; i < dev->num_tx_queues; i++) { | |
235 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
f6e0b239 | 236 | struct Qdisc *txq_root = txq->qdisc_sleeping; |
1da177e4 | 237 | |
8123b421 DM |
238 | q = qdisc_match_from_root(txq_root, handle); |
239 | if (q) | |
f6e0b239 | 240 | goto unlock; |
1da177e4 | 241 | } |
f6e0b239 JP |
242 | |
243 | q = qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle); | |
244 | ||
245 | unlock: | |
246 | spin_unlock_bh(&qdisc_list_lock); | |
247 | ||
248 | return q; | |
1da177e4 LT |
249 | } |
250 | ||
251 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
252 | { | |
253 | unsigned long cl; | |
254 | struct Qdisc *leaf; | |
20fea08b | 255 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
256 | |
257 | if (cops == NULL) | |
258 | return NULL; | |
259 | cl = cops->get(p, classid); | |
260 | ||
261 | if (cl == 0) | |
262 | return NULL; | |
263 | leaf = cops->leaf(p, cl); | |
264 | cops->put(p, cl); | |
265 | return leaf; | |
266 | } | |
267 | ||
268 | /* Find queueing discipline by name */ | |
269 | ||
1e90474c | 270 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
271 | { |
272 | struct Qdisc_ops *q = NULL; | |
273 | ||
274 | if (kind) { | |
275 | read_lock(&qdisc_mod_lock); | |
276 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 277 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
278 | if (!try_module_get(q->owner)) |
279 | q = NULL; | |
280 | break; | |
281 | } | |
282 | } | |
283 | read_unlock(&qdisc_mod_lock); | |
284 | } | |
285 | return q; | |
286 | } | |
287 | ||
288 | static struct qdisc_rate_table *qdisc_rtab_list; | |
289 | ||
1e90474c | 290 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
291 | { |
292 | struct qdisc_rate_table *rtab; | |
293 | ||
294 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
295 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
296 | rtab->refcnt++; | |
297 | return rtab; | |
298 | } | |
299 | } | |
300 | ||
5feb5e1a PM |
301 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
302 | nla_len(tab) != TC_RTAB_SIZE) | |
1da177e4 LT |
303 | return NULL; |
304 | ||
305 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
306 | if (rtab) { | |
307 | rtab->rate = *r; | |
308 | rtab->refcnt = 1; | |
1e90474c | 309 | memcpy(rtab->data, nla_data(tab), 1024); |
1da177e4 LT |
310 | rtab->next = qdisc_rtab_list; |
311 | qdisc_rtab_list = rtab; | |
312 | } | |
313 | return rtab; | |
314 | } | |
62e3ba1b | 315 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
316 | |
317 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
318 | { | |
319 | struct qdisc_rate_table *rtab, **rtabp; | |
320 | ||
321 | if (!tab || --tab->refcnt) | |
322 | return; | |
323 | ||
324 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
325 | if (rtab == tab) { | |
326 | *rtabp = rtab->next; | |
327 | kfree(rtab); | |
328 | return; | |
329 | } | |
330 | } | |
331 | } | |
62e3ba1b | 332 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 333 | |
175f9c1b JK |
334 | static LIST_HEAD(qdisc_stab_list); |
335 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
336 | ||
337 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
338 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
339 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
340 | }; | |
341 | ||
342 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
343 | { | |
344 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
345 | struct qdisc_size_table *stab; | |
346 | struct tc_sizespec *s; | |
347 | unsigned int tsize = 0; | |
348 | u16 *tab = NULL; | |
349 | int err; | |
350 | ||
351 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
352 | if (err < 0) | |
353 | return ERR_PTR(err); | |
354 | if (!tb[TCA_STAB_BASE]) | |
355 | return ERR_PTR(-EINVAL); | |
356 | ||
357 | s = nla_data(tb[TCA_STAB_BASE]); | |
358 | ||
359 | if (s->tsize > 0) { | |
360 | if (!tb[TCA_STAB_DATA]) | |
361 | return ERR_PTR(-EINVAL); | |
362 | tab = nla_data(tb[TCA_STAB_DATA]); | |
363 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
364 | } | |
365 | ||
366 | if (!s || tsize != s->tsize || (!tab && tsize > 0)) | |
367 | return ERR_PTR(-EINVAL); | |
368 | ||
f3b9605d | 369 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
370 | |
371 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
372 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
373 | continue; | |
374 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
375 | continue; | |
376 | stab->refcnt++; | |
f3b9605d | 377 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
378 | return stab; |
379 | } | |
380 | ||
f3b9605d | 381 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
382 | |
383 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
384 | if (!stab) | |
385 | return ERR_PTR(-ENOMEM); | |
386 | ||
387 | stab->refcnt = 1; | |
388 | stab->szopts = *s; | |
389 | if (tsize > 0) | |
390 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
391 | ||
f3b9605d | 392 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 393 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 394 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
395 | |
396 | return stab; | |
397 | } | |
398 | ||
399 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
400 | { | |
401 | if (!tab) | |
402 | return; | |
403 | ||
f3b9605d | 404 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
405 | |
406 | if (--tab->refcnt == 0) { | |
407 | list_del(&tab->list); | |
408 | kfree(tab); | |
409 | } | |
410 | ||
f3b9605d | 411 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
412 | } |
413 | EXPORT_SYMBOL(qdisc_put_stab); | |
414 | ||
415 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
416 | { | |
417 | struct nlattr *nest; | |
418 | ||
419 | nest = nla_nest_start(skb, TCA_STAB); | |
420 | NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); | |
421 | nla_nest_end(skb, nest); | |
422 | ||
423 | return skb->len; | |
424 | ||
425 | nla_put_failure: | |
426 | return -1; | |
427 | } | |
428 | ||
429 | void qdisc_calculate_pkt_len(struct sk_buff *skb, struct qdisc_size_table *stab) | |
430 | { | |
431 | int pkt_len, slot; | |
432 | ||
433 | pkt_len = skb->len + stab->szopts.overhead; | |
434 | if (unlikely(!stab->szopts.tsize)) | |
435 | goto out; | |
436 | ||
437 | slot = pkt_len + stab->szopts.cell_align; | |
438 | if (unlikely(slot < 0)) | |
439 | slot = 0; | |
440 | ||
441 | slot >>= stab->szopts.cell_log; | |
442 | if (likely(slot < stab->szopts.tsize)) | |
443 | pkt_len = stab->data[slot]; | |
444 | else | |
445 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
446 | (slot / stab->szopts.tsize) + | |
447 | stab->data[slot % stab->szopts.tsize]; | |
448 | ||
449 | pkt_len <<= stab->szopts.size_log; | |
450 | out: | |
451 | if (unlikely(pkt_len < 1)) | |
452 | pkt_len = 1; | |
453 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
454 | } | |
455 | EXPORT_SYMBOL(qdisc_calculate_pkt_len); | |
456 | ||
4179477f PM |
457 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
458 | { | |
459 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
460 | timer); | |
461 | ||
462 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
11274e5a | 463 | smp_wmb(); |
8608db03 | 464 | __netif_schedule(qdisc_root(wd->qdisc)); |
1936502d | 465 | |
4179477f PM |
466 | return HRTIMER_NORESTART; |
467 | } | |
468 | ||
469 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
470 | { | |
471 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
472 | wd->timer.function = qdisc_watchdog; | |
473 | wd->qdisc = qdisc; | |
474 | } | |
475 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
476 | ||
477 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
478 | { | |
479 | ktime_t time; | |
480 | ||
2540e051 JP |
481 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
482 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
483 | return; | |
484 | ||
4179477f PM |
485 | wd->qdisc->flags |= TCQ_F_THROTTLED; |
486 | time = ktime_set(0, 0); | |
487 | time = ktime_add_ns(time, PSCHED_US2NS(expires)); | |
488 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); | |
489 | } | |
490 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
491 | ||
492 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
493 | { | |
494 | hrtimer_cancel(&wd->timer); | |
495 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
496 | } | |
497 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 498 | |
a94f779f | 499 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
500 | { |
501 | unsigned int size = n * sizeof(struct hlist_head), i; | |
502 | struct hlist_head *h; | |
503 | ||
504 | if (size <= PAGE_SIZE) | |
505 | h = kmalloc(size, GFP_KERNEL); | |
506 | else | |
507 | h = (struct hlist_head *) | |
508 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
509 | ||
510 | if (h != NULL) { | |
511 | for (i = 0; i < n; i++) | |
512 | INIT_HLIST_HEAD(&h[i]); | |
513 | } | |
514 | return h; | |
515 | } | |
516 | ||
517 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
518 | { | |
519 | unsigned int size = n * sizeof(struct hlist_head); | |
520 | ||
521 | if (size <= PAGE_SIZE) | |
522 | kfree(h); | |
523 | else | |
524 | free_pages((unsigned long)h, get_order(size)); | |
525 | } | |
526 | ||
527 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
528 | { | |
529 | struct Qdisc_class_common *cl; | |
530 | struct hlist_node *n, *next; | |
531 | struct hlist_head *nhash, *ohash; | |
532 | unsigned int nsize, nmask, osize; | |
533 | unsigned int i, h; | |
534 | ||
535 | /* Rehash when load factor exceeds 0.75 */ | |
536 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
537 | return; | |
538 | nsize = clhash->hashsize * 2; | |
539 | nmask = nsize - 1; | |
540 | nhash = qdisc_class_hash_alloc(nsize); | |
541 | if (nhash == NULL) | |
542 | return; | |
543 | ||
544 | ohash = clhash->hash; | |
545 | osize = clhash->hashsize; | |
546 | ||
547 | sch_tree_lock(sch); | |
548 | for (i = 0; i < osize; i++) { | |
549 | hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) { | |
550 | h = qdisc_class_hash(cl->classid, nmask); | |
551 | hlist_add_head(&cl->hnode, &nhash[h]); | |
552 | } | |
553 | } | |
554 | clhash->hash = nhash; | |
555 | clhash->hashsize = nsize; | |
556 | clhash->hashmask = nmask; | |
557 | sch_tree_unlock(sch); | |
558 | ||
559 | qdisc_class_hash_free(ohash, osize); | |
560 | } | |
561 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
562 | ||
563 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
564 | { | |
565 | unsigned int size = 4; | |
566 | ||
567 | clhash->hash = qdisc_class_hash_alloc(size); | |
568 | if (clhash->hash == NULL) | |
569 | return -ENOMEM; | |
570 | clhash->hashsize = size; | |
571 | clhash->hashmask = size - 1; | |
572 | clhash->hashelems = 0; | |
573 | return 0; | |
574 | } | |
575 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
576 | ||
577 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
578 | { | |
579 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
580 | } | |
581 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
582 | ||
583 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
584 | struct Qdisc_class_common *cl) | |
585 | { | |
586 | unsigned int h; | |
587 | ||
588 | INIT_HLIST_NODE(&cl->hnode); | |
589 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
590 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
591 | clhash->hashelems++; | |
592 | } | |
593 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
594 | ||
595 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
596 | struct Qdisc_class_common *cl) | |
597 | { | |
598 | hlist_del(&cl->hnode); | |
599 | clhash->hashelems--; | |
600 | } | |
601 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
602 | ||
1da177e4 LT |
603 | /* Allocate an unique handle from space managed by kernel */ |
604 | ||
605 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
606 | { | |
607 | int i = 0x10000; | |
608 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
609 | ||
610 | do { | |
611 | autohandle += TC_H_MAKE(0x10000U, 0); | |
612 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
613 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
614 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
615 | ||
616 | return i>0 ? autohandle : 0; | |
617 | } | |
618 | ||
99194cff | 619 | /* Attach toplevel qdisc to device queue. */ |
1da177e4 | 620 | |
99194cff DM |
621 | static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
622 | struct Qdisc *qdisc) | |
1da177e4 | 623 | { |
8d50b53d | 624 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; |
53049978 | 625 | spinlock_t *root_lock; |
53049978 | 626 | |
666d9bbe | 627 | root_lock = qdisc_lock(oqdisc); |
53049978 DM |
628 | spin_lock_bh(root_lock); |
629 | ||
8d50b53d DM |
630 | /* Prune old scheduler */ |
631 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
632 | qdisc_reset(oqdisc); | |
1da177e4 | 633 | |
8d50b53d DM |
634 | /* ... and graft new one */ |
635 | if (qdisc == NULL) | |
636 | qdisc = &noop_qdisc; | |
637 | dev_queue->qdisc_sleeping = qdisc; | |
f7a54c13 | 638 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); |
1da177e4 | 639 | |
53049978 | 640 | spin_unlock_bh(root_lock); |
1da177e4 | 641 | |
1da177e4 LT |
642 | return oqdisc; |
643 | } | |
644 | ||
43effa1e PM |
645 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
646 | { | |
20fea08b | 647 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
648 | unsigned long cl; |
649 | u32 parentid; | |
650 | ||
651 | if (n == 0) | |
652 | return; | |
653 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
654 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
655 | return; | |
656 | ||
5ce2d488 | 657 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
658 | if (sch == NULL) { |
659 | WARN_ON(parentid != TC_H_ROOT); | |
660 | return; | |
661 | } | |
43effa1e PM |
662 | cops = sch->ops->cl_ops; |
663 | if (cops->qlen_notify) { | |
664 | cl = cops->get(sch, parentid); | |
665 | cops->qlen_notify(sch, cl); | |
666 | cops->put(sch, cl); | |
667 | } | |
668 | sch->q.qlen -= n; | |
669 | } | |
670 | } | |
671 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 672 | |
99194cff DM |
673 | static void notify_and_destroy(struct sk_buff *skb, struct nlmsghdr *n, u32 clid, |
674 | struct Qdisc *old, struct Qdisc *new) | |
675 | { | |
676 | if (new || old) | |
677 | qdisc_notify(skb, n, clid, old, new); | |
1da177e4 | 678 | |
4d8863a2 | 679 | if (old) |
99194cff | 680 | qdisc_destroy(old); |
99194cff DM |
681 | } |
682 | ||
683 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
684 | * to device "dev". | |
685 | * | |
686 | * When appropriate send a netlink notification using 'skb' | |
687 | * and "n". | |
688 | * | |
689 | * On success, destroy old qdisc. | |
1da177e4 LT |
690 | */ |
691 | ||
692 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
693 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
694 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 695 | { |
99194cff | 696 | struct Qdisc *q = old; |
1da177e4 | 697 | int err = 0; |
1da177e4 | 698 | |
10297b99 | 699 | if (parent == NULL) { |
99194cff DM |
700 | unsigned int i, num_q, ingress; |
701 | ||
702 | ingress = 0; | |
703 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
704 | if ((q && q->flags & TCQ_F_INGRESS) || |
705 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
706 | num_q = 1; |
707 | ingress = 1; | |
708 | } | |
709 | ||
710 | if (dev->flags & IFF_UP) | |
711 | dev_deactivate(dev); | |
712 | ||
713 | for (i = 0; i < num_q; i++) { | |
714 | struct netdev_queue *dev_queue = &dev->rx_queue; | |
715 | ||
716 | if (!ingress) | |
717 | dev_queue = netdev_get_tx_queue(dev, i); | |
718 | ||
8d50b53d DM |
719 | old = dev_graft_qdisc(dev_queue, new); |
720 | if (new && i > 0) | |
721 | atomic_inc(&new->refcnt); | |
722 | ||
99194cff | 723 | notify_and_destroy(skb, n, classid, old, new); |
1da177e4 | 724 | } |
99194cff DM |
725 | |
726 | if (dev->flags & IFF_UP) | |
727 | dev_activate(dev); | |
1da177e4 | 728 | } else { |
20fea08b | 729 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 LT |
730 | |
731 | err = -EINVAL; | |
732 | ||
733 | if (cops) { | |
734 | unsigned long cl = cops->get(parent, classid); | |
735 | if (cl) { | |
99194cff | 736 | err = cops->graft(parent, cl, new, &old); |
1da177e4 LT |
737 | cops->put(parent, cl); |
738 | } | |
739 | } | |
99194cff DM |
740 | if (!err) |
741 | notify_and_destroy(skb, n, classid, old, new); | |
1da177e4 LT |
742 | } |
743 | return err; | |
744 | } | |
745 | ||
25bfcd5a JP |
746 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
747 | static struct lock_class_key qdisc_tx_lock; | |
748 | static struct lock_class_key qdisc_rx_lock; | |
749 | ||
1da177e4 LT |
750 | /* |
751 | Allocate and initialize new qdisc. | |
752 | ||
753 | Parameters are passed via opt. | |
754 | */ | |
755 | ||
756 | static struct Qdisc * | |
bb949fbd DM |
757 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
758 | u32 parent, u32 handle, struct nlattr **tca, int *errp) | |
1da177e4 LT |
759 | { |
760 | int err; | |
1e90474c | 761 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
762 | struct Qdisc *sch; |
763 | struct Qdisc_ops *ops; | |
175f9c1b | 764 | struct qdisc_size_table *stab; |
1da177e4 LT |
765 | |
766 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 767 | #ifdef CONFIG_MODULES |
1da177e4 LT |
768 | if (ops == NULL && kind != NULL) { |
769 | char name[IFNAMSIZ]; | |
1e90474c | 770 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
771 | /* We dropped the RTNL semaphore in order to |
772 | * perform the module load. So, even if we | |
773 | * succeeded in loading the module we have to | |
774 | * tell the caller to replay the request. We | |
775 | * indicate this using -EAGAIN. | |
776 | * We replay the request because the device may | |
777 | * go away in the mean time. | |
778 | */ | |
779 | rtnl_unlock(); | |
780 | request_module("sch_%s", name); | |
781 | rtnl_lock(); | |
782 | ops = qdisc_lookup_ops(kind); | |
783 | if (ops != NULL) { | |
784 | /* We will try again qdisc_lookup_ops, | |
785 | * so don't keep a reference. | |
786 | */ | |
787 | module_put(ops->owner); | |
788 | err = -EAGAIN; | |
789 | goto err_out; | |
790 | } | |
791 | } | |
792 | } | |
793 | #endif | |
794 | ||
b9e2cc0f | 795 | err = -ENOENT; |
1da177e4 LT |
796 | if (ops == NULL) |
797 | goto err_out; | |
798 | ||
5ce2d488 | 799 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
800 | if (IS_ERR(sch)) { |
801 | err = PTR_ERR(sch); | |
1da177e4 | 802 | goto err_out2; |
3d54b82f | 803 | } |
1da177e4 | 804 | |
ffc8fefa PM |
805 | sch->parent = parent; |
806 | ||
3d54b82f | 807 | if (handle == TC_H_INGRESS) { |
1da177e4 | 808 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 809 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 810 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 811 | } else { |
fd44de7c PM |
812 | if (handle == 0) { |
813 | handle = qdisc_alloc_handle(dev); | |
814 | err = -ENOMEM; | |
815 | if (handle == 0) | |
816 | goto err_out3; | |
817 | } | |
25bfcd5a | 818 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1da177e4 LT |
819 | } |
820 | ||
3d54b82f | 821 | sch->handle = handle; |
1da177e4 | 822 | |
1e90474c | 823 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
824 | if (tca[TCA_STAB]) { |
825 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
826 | if (IS_ERR(stab)) { | |
827 | err = PTR_ERR(stab); | |
828 | goto err_out3; | |
829 | } | |
830 | sch->stab = stab; | |
831 | } | |
1e90474c | 832 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
833 | spinlock_t *root_lock; |
834 | ||
835 | if ((sch->parent != TC_H_ROOT) && | |
836 | !(sch->flags & TCQ_F_INGRESS)) | |
837 | root_lock = qdisc_root_sleeping_lock(sch); | |
838 | else | |
839 | root_lock = qdisc_lock(sch); | |
840 | ||
023e09a7 | 841 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f | 842 | root_lock, tca[TCA_RATE]); |
023e09a7 TG |
843 | if (err) { |
844 | /* | |
845 | * Any broken qdiscs that would require | |
846 | * a ops->reset() here? The qdisc was never | |
847 | * in action so it shouldn't be necessary. | |
848 | */ | |
849 | if (ops->destroy) | |
850 | ops->destroy(sch); | |
851 | goto err_out3; | |
852 | } | |
853 | } | |
f6e0b239 JP |
854 | |
855 | qdisc_list_add(sch); | |
1da177e4 | 856 | |
1da177e4 LT |
857 | return sch; |
858 | } | |
859 | err_out3: | |
175f9c1b | 860 | qdisc_put_stab(sch->stab); |
1da177e4 | 861 | dev_put(dev); |
3d54b82f | 862 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
863 | err_out2: |
864 | module_put(ops->owner); | |
865 | err_out: | |
866 | *errp = err; | |
1da177e4 LT |
867 | return NULL; |
868 | } | |
869 | ||
1e90474c | 870 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 871 | { |
175f9c1b JK |
872 | struct qdisc_size_table *stab = NULL; |
873 | int err = 0; | |
1da177e4 | 874 | |
175f9c1b | 875 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
876 | if (sch->ops->change == NULL) |
877 | return -EINVAL; | |
1e90474c | 878 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
879 | if (err) |
880 | return err; | |
881 | } | |
175f9c1b JK |
882 | |
883 | if (tca[TCA_STAB]) { | |
884 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
885 | if (IS_ERR(stab)) | |
886 | return PTR_ERR(stab); | |
887 | } | |
888 | ||
889 | qdisc_put_stab(sch->stab); | |
890 | sch->stab = stab; | |
891 | ||
1e90474c | 892 | if (tca[TCA_RATE]) |
1da177e4 | 893 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f JP |
894 | qdisc_root_sleeping_lock(sch), |
895 | tca[TCA_RATE]); | |
1da177e4 LT |
896 | return 0; |
897 | } | |
898 | ||
899 | struct check_loop_arg | |
900 | { | |
901 | struct qdisc_walker w; | |
902 | struct Qdisc *p; | |
903 | int depth; | |
904 | }; | |
905 | ||
906 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
907 | ||
908 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
909 | { | |
910 | struct check_loop_arg arg; | |
911 | ||
912 | if (q->ops->cl_ops == NULL) | |
913 | return 0; | |
914 | ||
915 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
916 | arg.w.fn = check_loop_fn; | |
917 | arg.depth = depth; | |
918 | arg.p = p; | |
919 | q->ops->cl_ops->walk(q, &arg.w); | |
920 | return arg.w.stop ? -ELOOP : 0; | |
921 | } | |
922 | ||
923 | static int | |
924 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
925 | { | |
926 | struct Qdisc *leaf; | |
20fea08b | 927 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
928 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
929 | ||
930 | leaf = cops->leaf(q, cl); | |
931 | if (leaf) { | |
932 | if (leaf == arg->p || arg->depth > 7) | |
933 | return -ELOOP; | |
934 | return check_loop(leaf, arg->p, arg->depth + 1); | |
935 | } | |
936 | return 0; | |
937 | } | |
938 | ||
939 | /* | |
940 | * Delete/get qdisc. | |
941 | */ | |
942 | ||
943 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
944 | { | |
3b1e0a65 | 945 | struct net *net = sock_net(skb->sk); |
1da177e4 | 946 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 947 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
948 | struct net_device *dev; |
949 | u32 clid = tcm->tcm_parent; | |
950 | struct Qdisc *q = NULL; | |
951 | struct Qdisc *p = NULL; | |
952 | int err; | |
953 | ||
b854272b DL |
954 | if (net != &init_net) |
955 | return -EINVAL; | |
956 | ||
881d966b | 957 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
958 | return -ENODEV; |
959 | ||
1e90474c PM |
960 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
961 | if (err < 0) | |
962 | return err; | |
963 | ||
1da177e4 LT |
964 | if (clid) { |
965 | if (clid != TC_H_ROOT) { | |
966 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
967 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
968 | return -ENOENT; | |
969 | q = qdisc_leaf(p, clid); | |
970 | } else { /* ingress */ | |
8123b421 | 971 | q = dev->rx_queue.qdisc_sleeping; |
10297b99 | 972 | } |
1da177e4 | 973 | } else { |
e8a0464c DM |
974 | struct netdev_queue *dev_queue; |
975 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 976 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
977 | } |
978 | if (!q) | |
979 | return -ENOENT; | |
980 | ||
981 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
982 | return -EINVAL; | |
983 | } else { | |
984 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
985 | return -ENOENT; | |
986 | } | |
987 | ||
1e90474c | 988 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
989 | return -EINVAL; |
990 | ||
991 | if (n->nlmsg_type == RTM_DELQDISC) { | |
992 | if (!clid) | |
993 | return -EINVAL; | |
994 | if (q->handle == 0) | |
995 | return -ENOENT; | |
99194cff | 996 | if ((err = qdisc_graft(dev, p, skb, n, clid, NULL, q)) != 0) |
1da177e4 | 997 | return err; |
1da177e4 LT |
998 | } else { |
999 | qdisc_notify(skb, n, clid, NULL, q); | |
1000 | } | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | Create/change qdisc. | |
1006 | */ | |
1007 | ||
1008 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1009 | { | |
3b1e0a65 | 1010 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1011 | struct tcmsg *tcm; |
1e90474c | 1012 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1013 | struct net_device *dev; |
1014 | u32 clid; | |
1015 | struct Qdisc *q, *p; | |
1016 | int err; | |
1017 | ||
b854272b DL |
1018 | if (net != &init_net) |
1019 | return -EINVAL; | |
1020 | ||
1da177e4 LT |
1021 | replay: |
1022 | /* Reinit, just in case something touches this. */ | |
1023 | tcm = NLMSG_DATA(n); | |
1da177e4 LT |
1024 | clid = tcm->tcm_parent; |
1025 | q = p = NULL; | |
1026 | ||
881d966b | 1027 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1028 | return -ENODEV; |
1029 | ||
1e90474c PM |
1030 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1031 | if (err < 0) | |
1032 | return err; | |
1033 | ||
1da177e4 LT |
1034 | if (clid) { |
1035 | if (clid != TC_H_ROOT) { | |
1036 | if (clid != TC_H_INGRESS) { | |
1037 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
1038 | return -ENOENT; | |
1039 | q = qdisc_leaf(p, clid); | |
1040 | } else { /*ingress */ | |
8123b421 | 1041 | q = dev->rx_queue.qdisc_sleeping; |
1da177e4 LT |
1042 | } |
1043 | } else { | |
e8a0464c DM |
1044 | struct netdev_queue *dev_queue; |
1045 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 1046 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
1047 | } |
1048 | ||
1049 | /* It may be default qdisc, ignore it */ | |
1050 | if (q && q->handle == 0) | |
1051 | q = NULL; | |
1052 | ||
1053 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1054 | if (tcm->tcm_handle) { | |
1055 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
1056 | return -EEXIST; | |
1057 | if (TC_H_MIN(tcm->tcm_handle)) | |
1058 | return -EINVAL; | |
1059 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
1060 | goto create_n_graft; | |
1061 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1062 | return -EEXIST; | |
1e90474c | 1063 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1064 | return -EINVAL; |
1065 | if (q == p || | |
1066 | (p && check_loop(q, p, 0))) | |
1067 | return -ELOOP; | |
1068 | atomic_inc(&q->refcnt); | |
1069 | goto graft; | |
1070 | } else { | |
1071 | if (q == NULL) | |
1072 | goto create_n_graft; | |
1073 | ||
1074 | /* This magic test requires explanation. | |
1075 | * | |
1076 | * We know, that some child q is already | |
1077 | * attached to this parent and have choice: | |
1078 | * either to change it or to create/graft new one. | |
1079 | * | |
1080 | * 1. We are allowed to create/graft only | |
1081 | * if CREATE and REPLACE flags are set. | |
1082 | * | |
1083 | * 2. If EXCL is set, requestor wanted to say, | |
1084 | * that qdisc tcm_handle is not expected | |
1085 | * to exist, so that we choose create/graft too. | |
1086 | * | |
1087 | * 3. The last case is when no flags are set. | |
1088 | * Alas, it is sort of hole in API, we | |
1089 | * cannot decide what to do unambiguously. | |
1090 | * For now we select create/graft, if | |
1091 | * user gave KIND, which does not match existing. | |
1092 | */ | |
1093 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
1094 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
1095 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
1e90474c PM |
1096 | (tca[TCA_KIND] && |
1097 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1098 | goto create_n_graft; |
1099 | } | |
1100 | } | |
1101 | } else { | |
1102 | if (!tcm->tcm_handle) | |
1103 | return -EINVAL; | |
1104 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1105 | } | |
1106 | ||
1107 | /* Change qdisc parameters */ | |
1108 | if (q == NULL) | |
1109 | return -ENOENT; | |
1110 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1111 | return -EEXIST; | |
1e90474c | 1112 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1113 | return -EINVAL; |
1114 | err = qdisc_change(q, tca); | |
1115 | if (err == 0) | |
1116 | qdisc_notify(skb, n, clid, NULL, q); | |
1117 | return err; | |
1118 | ||
1119 | create_n_graft: | |
1120 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
1121 | return -ENOENT; | |
1122 | if (clid == TC_H_INGRESS) | |
bb949fbd DM |
1123 | q = qdisc_create(dev, &dev->rx_queue, |
1124 | tcm->tcm_parent, tcm->tcm_parent, | |
ffc8fefa | 1125 | tca, &err); |
10297b99 | 1126 | else |
e8a0464c | 1127 | q = qdisc_create(dev, netdev_get_tx_queue(dev, 0), |
bb949fbd | 1128 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1129 | tca, &err); |
1da177e4 LT |
1130 | if (q == NULL) { |
1131 | if (err == -EAGAIN) | |
1132 | goto replay; | |
1133 | return err; | |
1134 | } | |
1135 | ||
1136 | graft: | |
e5befbd9 IJ |
1137 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1138 | if (err) { | |
1139 | if (q) | |
1140 | qdisc_destroy(q); | |
1141 | return err; | |
1da177e4 | 1142 | } |
e5befbd9 | 1143 | |
1da177e4 LT |
1144 | return 0; |
1145 | } | |
1146 | ||
1147 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 1148 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1149 | { |
1150 | struct tcmsg *tcm; | |
1151 | struct nlmsghdr *nlh; | |
27a884dc | 1152 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1153 | struct gnet_dump d; |
1154 | ||
e431b8c0 | 1155 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1156 | tcm = NLMSG_DATA(nlh); |
1157 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1158 | tcm->tcm__pad1 = 0; |
1159 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1160 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1161 | tcm->tcm_parent = clid; |
1162 | tcm->tcm_handle = q->handle; | |
1163 | tcm->tcm_info = atomic_read(&q->refcnt); | |
57e1c487 | 1164 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1165 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1166 | goto nla_put_failure; |
1da177e4 LT |
1167 | q->qstats.qlen = q->q.qlen; |
1168 | ||
175f9c1b JK |
1169 | if (q->stab && qdisc_dump_stab(skb, q->stab) < 0) |
1170 | goto nla_put_failure; | |
1171 | ||
102396ae JP |
1172 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1173 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1174 | goto nla_put_failure; |
1da177e4 LT |
1175 | |
1176 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1177 | goto nla_put_failure; |
1da177e4 LT |
1178 | |
1179 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
1da177e4 | 1180 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
1da177e4 | 1181 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1182 | goto nla_put_failure; |
10297b99 | 1183 | |
1da177e4 | 1184 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1185 | goto nla_put_failure; |
10297b99 | 1186 | |
27a884dc | 1187 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1188 | return skb->len; |
1189 | ||
1190 | nlmsg_failure: | |
1e90474c | 1191 | nla_put_failure: |
dc5fc579 | 1192 | nlmsg_trim(skb, b); |
1da177e4 LT |
1193 | return -1; |
1194 | } | |
1195 | ||
1196 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1197 | u32 clid, struct Qdisc *old, struct Qdisc *new) | |
1198 | { | |
1199 | struct sk_buff *skb; | |
1200 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1201 | ||
1202 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1203 | if (!skb) | |
1204 | return -ENOBUFS; | |
1205 | ||
1206 | if (old && old->handle) { | |
1207 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) | |
1208 | goto err_out; | |
1209 | } | |
1210 | if (new) { | |
1211 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
1212 | goto err_out; | |
1213 | } | |
1214 | ||
1215 | if (skb->len) | |
97c53cac | 1216 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1217 | |
1218 | err_out: | |
1219 | kfree_skb(skb); | |
1220 | return -EINVAL; | |
1221 | } | |
1222 | ||
30723673 DM |
1223 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1224 | { | |
1225 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1226 | } | |
1227 | ||
1228 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, | |
1229 | struct netlink_callback *cb, | |
1230 | int *q_idx_p, int s_q_idx) | |
1231 | { | |
1232 | int ret = 0, q_idx = *q_idx_p; | |
1233 | struct Qdisc *q; | |
1234 | ||
1235 | if (!root) | |
1236 | return 0; | |
1237 | ||
1238 | q = root; | |
1239 | if (q_idx < s_q_idx) { | |
1240 | q_idx++; | |
1241 | } else { | |
1242 | if (!tc_qdisc_dump_ignore(q) && | |
1243 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1244 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1245 | goto done; | |
1246 | q_idx++; | |
1247 | } | |
1248 | list_for_each_entry(q, &root->list, list) { | |
1249 | if (q_idx < s_q_idx) { | |
1250 | q_idx++; | |
1251 | continue; | |
1252 | } | |
1253 | if (!tc_qdisc_dump_ignore(q) && | |
1254 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1255 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1256 | goto done; | |
1257 | q_idx++; | |
1258 | } | |
1259 | ||
1260 | out: | |
1261 | *q_idx_p = q_idx; | |
1262 | return ret; | |
1263 | done: | |
1264 | ret = -1; | |
1265 | goto out; | |
1266 | } | |
1267 | ||
1da177e4 LT |
1268 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1269 | { | |
3b1e0a65 | 1270 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1271 | int idx, q_idx; |
1272 | int s_idx, s_q_idx; | |
1273 | struct net_device *dev; | |
1da177e4 | 1274 | |
b854272b DL |
1275 | if (net != &init_net) |
1276 | return 0; | |
1277 | ||
1da177e4 LT |
1278 | s_idx = cb->args[0]; |
1279 | s_q_idx = q_idx = cb->args[1]; | |
1280 | read_lock(&dev_base_lock); | |
7562f876 | 1281 | idx = 0; |
881d966b | 1282 | for_each_netdev(&init_net, dev) { |
30723673 DM |
1283 | struct netdev_queue *dev_queue; |
1284 | ||
1da177e4 | 1285 | if (idx < s_idx) |
7562f876 | 1286 | goto cont; |
1da177e4 LT |
1287 | if (idx > s_idx) |
1288 | s_q_idx = 0; | |
1da177e4 | 1289 | q_idx = 0; |
30723673 DM |
1290 | |
1291 | dev_queue = netdev_get_tx_queue(dev, 0); | |
827ebd64 | 1292 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1293 | goto done; |
1294 | ||
1295 | dev_queue = &dev->rx_queue; | |
827ebd64 | 1296 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1297 | goto done; |
1298 | ||
7562f876 PE |
1299 | cont: |
1300 | idx++; | |
1da177e4 LT |
1301 | } |
1302 | ||
1303 | done: | |
1304 | read_unlock(&dev_base_lock); | |
1305 | ||
1306 | cb->args[0] = idx; | |
1307 | cb->args[1] = q_idx; | |
1308 | ||
1309 | return skb->len; | |
1310 | } | |
1311 | ||
1312 | ||
1313 | ||
1314 | /************************************************ | |
1315 | * Traffic classes manipulation. * | |
1316 | ************************************************/ | |
1317 | ||
1318 | ||
1319 | ||
1320 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1321 | { | |
3b1e0a65 | 1322 | struct net *net = sock_net(skb->sk); |
b0e1e646 | 1323 | struct netdev_queue *dev_queue; |
1da177e4 | 1324 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 1325 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1326 | struct net_device *dev; |
1327 | struct Qdisc *q = NULL; | |
20fea08b | 1328 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1329 | unsigned long cl = 0; |
1330 | unsigned long new_cl; | |
1331 | u32 pid = tcm->tcm_parent; | |
1332 | u32 clid = tcm->tcm_handle; | |
1333 | u32 qid = TC_H_MAJ(clid); | |
1334 | int err; | |
1335 | ||
b854272b DL |
1336 | if (net != &init_net) |
1337 | return -EINVAL; | |
1338 | ||
881d966b | 1339 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1340 | return -ENODEV; |
1341 | ||
1e90474c PM |
1342 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1343 | if (err < 0) | |
1344 | return err; | |
1345 | ||
1da177e4 LT |
1346 | /* |
1347 | parent == TC_H_UNSPEC - unspecified parent. | |
1348 | parent == TC_H_ROOT - class is root, which has no parent. | |
1349 | parent == X:0 - parent is root class. | |
1350 | parent == X:Y - parent is a node in hierarchy. | |
1351 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1352 | ||
1353 | handle == 0:0 - generate handle from kernel pool. | |
1354 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1355 | handle == X:Y - clear. | |
1356 | handle == X:0 - root class. | |
1357 | */ | |
1358 | ||
1359 | /* Step 1. Determine qdisc handle X:0 */ | |
1360 | ||
e8a0464c | 1361 | dev_queue = netdev_get_tx_queue(dev, 0); |
1da177e4 LT |
1362 | if (pid != TC_H_ROOT) { |
1363 | u32 qid1 = TC_H_MAJ(pid); | |
1364 | ||
1365 | if (qid && qid1) { | |
1366 | /* If both majors are known, they must be identical. */ | |
1367 | if (qid != qid1) | |
1368 | return -EINVAL; | |
1369 | } else if (qid1) { | |
1370 | qid = qid1; | |
1371 | } else if (qid == 0) | |
b0e1e646 | 1372 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1373 | |
1374 | /* Now qid is genuine qdisc handle consistent | |
1375 | both with parent and child. | |
1376 | ||
1377 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
1378 | */ | |
1379 | if (pid) | |
1380 | pid = TC_H_MAKE(qid, pid); | |
1381 | } else { | |
1382 | if (qid == 0) | |
b0e1e646 | 1383 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1384 | } |
1385 | ||
1386 | /* OK. Locate qdisc */ | |
10297b99 | 1387 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
1da177e4 LT |
1388 | return -ENOENT; |
1389 | ||
1390 | /* An check that it supports classes */ | |
1391 | cops = q->ops->cl_ops; | |
1392 | if (cops == NULL) | |
1393 | return -EINVAL; | |
1394 | ||
1395 | /* Now try to get class */ | |
1396 | if (clid == 0) { | |
1397 | if (pid == TC_H_ROOT) | |
1398 | clid = qid; | |
1399 | } else | |
1400 | clid = TC_H_MAKE(qid, clid); | |
1401 | ||
1402 | if (clid) | |
1403 | cl = cops->get(q, clid); | |
1404 | ||
1405 | if (cl == 0) { | |
1406 | err = -ENOENT; | |
1407 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
1408 | goto out; | |
1409 | } else { | |
1410 | switch (n->nlmsg_type) { | |
10297b99 | 1411 | case RTM_NEWTCLASS: |
1da177e4 LT |
1412 | err = -EEXIST; |
1413 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1414 | goto out; | |
1415 | break; | |
1416 | case RTM_DELTCLASS: | |
1417 | err = cops->delete(q, cl); | |
1418 | if (err == 0) | |
1419 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); | |
1420 | goto out; | |
1421 | case RTM_GETTCLASS: | |
1422 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); | |
1423 | goto out; | |
1424 | default: | |
1425 | err = -EINVAL; | |
1426 | goto out; | |
1427 | } | |
1428 | } | |
1429 | ||
1430 | new_cl = cl; | |
1431 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1432 | if (err == 0) | |
1433 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); | |
1434 | ||
1435 | out: | |
1436 | if (cl) | |
1437 | cops->put(q, cl); | |
1438 | ||
1439 | return err; | |
1440 | } | |
1441 | ||
1442 | ||
1443 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1444 | unsigned long cl, | |
e431b8c0 | 1445 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1446 | { |
1447 | struct tcmsg *tcm; | |
1448 | struct nlmsghdr *nlh; | |
27a884dc | 1449 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1450 | struct gnet_dump d; |
20fea08b | 1451 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1452 | |
e431b8c0 | 1453 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1454 | tcm = NLMSG_DATA(nlh); |
1455 | tcm->tcm_family = AF_UNSPEC; | |
5ce2d488 | 1456 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1457 | tcm->tcm_parent = q->handle; |
1458 | tcm->tcm_handle = q->handle; | |
1459 | tcm->tcm_info = 0; | |
57e1c487 | 1460 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1461 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1462 | goto nla_put_failure; |
1da177e4 | 1463 | |
102396ae JP |
1464 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1465 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1466 | goto nla_put_failure; |
1da177e4 LT |
1467 | |
1468 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1469 | goto nla_put_failure; |
1da177e4 LT |
1470 | |
1471 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1472 | goto nla_put_failure; |
1da177e4 | 1473 | |
27a884dc | 1474 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1475 | return skb->len; |
1476 | ||
1477 | nlmsg_failure: | |
1e90474c | 1478 | nla_put_failure: |
dc5fc579 | 1479 | nlmsg_trim(skb, b); |
1da177e4 LT |
1480 | return -1; |
1481 | } | |
1482 | ||
1483 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1484 | struct Qdisc *q, unsigned long cl, int event) | |
1485 | { | |
1486 | struct sk_buff *skb; | |
1487 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1488 | ||
1489 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1490 | if (!skb) | |
1491 | return -ENOBUFS; | |
1492 | ||
1493 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1494 | kfree_skb(skb); | |
1495 | return -EINVAL; | |
1496 | } | |
1497 | ||
97c53cac | 1498 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1499 | } |
1500 | ||
1501 | struct qdisc_dump_args | |
1502 | { | |
1503 | struct qdisc_walker w; | |
1504 | struct sk_buff *skb; | |
1505 | struct netlink_callback *cb; | |
1506 | }; | |
1507 | ||
1508 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1509 | { | |
1510 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1511 | ||
1512 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1513 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1514 | } | |
1515 | ||
30723673 DM |
1516 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1517 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1518 | int *t_p, int s_t) | |
1519 | { | |
1520 | struct qdisc_dump_args arg; | |
1521 | ||
1522 | if (tc_qdisc_dump_ignore(q) || | |
1523 | *t_p < s_t || !q->ops->cl_ops || | |
1524 | (tcm->tcm_parent && | |
1525 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1526 | (*t_p)++; | |
1527 | return 0; | |
1528 | } | |
1529 | if (*t_p > s_t) | |
1530 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1531 | arg.w.fn = qdisc_class_dump; | |
1532 | arg.skb = skb; | |
1533 | arg.cb = cb; | |
1534 | arg.w.stop = 0; | |
1535 | arg.w.skip = cb->args[1]; | |
1536 | arg.w.count = 0; | |
1537 | q->ops->cl_ops->walk(q, &arg.w); | |
1538 | cb->args[1] = arg.w.count; | |
1539 | if (arg.w.stop) | |
1540 | return -1; | |
1541 | (*t_p)++; | |
1542 | return 0; | |
1543 | } | |
1544 | ||
1545 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1546 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1547 | int *t_p, int s_t) | |
1548 | { | |
1549 | struct Qdisc *q; | |
1550 | ||
1551 | if (!root) | |
1552 | return 0; | |
1553 | ||
1554 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1555 | return -1; | |
1556 | ||
1557 | list_for_each_entry(q, &root->list, list) { | |
1558 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1559 | return -1; | |
1560 | } | |
1561 | ||
1562 | return 0; | |
1563 | } | |
1564 | ||
1da177e4 LT |
1565 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1566 | { | |
30723673 | 1567 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
3b1e0a65 | 1568 | struct net *net = sock_net(skb->sk); |
30723673 | 1569 | struct netdev_queue *dev_queue; |
1da177e4 | 1570 | struct net_device *dev; |
30723673 | 1571 | int t, s_t; |
1da177e4 | 1572 | |
b854272b DL |
1573 | if (net != &init_net) |
1574 | return 0; | |
1575 | ||
1da177e4 LT |
1576 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
1577 | return 0; | |
881d966b | 1578 | if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1579 | return 0; |
1580 | ||
1581 | s_t = cb->args[0]; | |
1582 | t = 0; | |
1583 | ||
30723673 | 1584 | dev_queue = netdev_get_tx_queue(dev, 0); |
8123b421 | 1585 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1586 | goto done; |
1587 | ||
1588 | dev_queue = &dev->rx_queue; | |
8123b421 | 1589 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 | 1590 | goto done; |
1da177e4 | 1591 | |
30723673 | 1592 | done: |
1da177e4 LT |
1593 | cb->args[0] = t; |
1594 | ||
1595 | dev_put(dev); | |
1596 | return skb->len; | |
1597 | } | |
1598 | ||
1599 | /* Main classifier routine: scans classifier chain attached | |
1600 | to this qdisc, (optionally) tests for protocol and asks | |
1601 | specific classifiers. | |
1602 | */ | |
73ca4918 PM |
1603 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1604 | struct tcf_result *res) | |
1605 | { | |
1606 | __be16 protocol = skb->protocol; | |
1607 | int err = 0; | |
1608 | ||
1609 | for (; tp; tp = tp->next) { | |
1610 | if ((tp->protocol == protocol || | |
1611 | tp->protocol == htons(ETH_P_ALL)) && | |
1612 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1613 | #ifdef CONFIG_NET_CLS_ACT | |
1614 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1615 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1616 | #endif | |
1617 | return err; | |
1618 | } | |
1619 | } | |
1620 | return -1; | |
1621 | } | |
1622 | EXPORT_SYMBOL(tc_classify_compat); | |
1623 | ||
1da177e4 | 1624 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1625 | struct tcf_result *res) |
1da177e4 LT |
1626 | { |
1627 | int err = 0; | |
73ca4918 | 1628 | __be16 protocol; |
1da177e4 LT |
1629 | #ifdef CONFIG_NET_CLS_ACT |
1630 | struct tcf_proto *otp = tp; | |
1631 | reclassify: | |
1632 | #endif | |
1633 | protocol = skb->protocol; | |
1634 | ||
73ca4918 | 1635 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1636 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1637 | if (err == TC_ACT_RECLASSIFY) { |
1638 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1639 | tp = otp; | |
1640 | ||
1641 | if (verd++ >= MAX_REC_LOOP) { | |
1642 | printk("rule prio %u protocol %02x reclassify loop, " | |
1643 | "packet dropped\n", | |
1644 | tp->prio&0xffff, ntohs(tp->protocol)); | |
1645 | return TC_ACT_SHOT; | |
1da177e4 | 1646 | } |
73ca4918 PM |
1647 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1648 | goto reclassify; | |
1da177e4 | 1649 | } |
73ca4918 PM |
1650 | #endif |
1651 | return err; | |
1da177e4 | 1652 | } |
73ca4918 | 1653 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1654 | |
a48b5a61 PM |
1655 | void tcf_destroy(struct tcf_proto *tp) |
1656 | { | |
1657 | tp->ops->destroy(tp); | |
1658 | module_put(tp->ops->owner); | |
1659 | kfree(tp); | |
1660 | } | |
1661 | ||
ff31ab56 | 1662 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1663 | { |
1664 | struct tcf_proto *tp; | |
1665 | ||
ff31ab56 PM |
1666 | while ((tp = *fl) != NULL) { |
1667 | *fl = tp->next; | |
a48b5a61 PM |
1668 | tcf_destroy(tp); |
1669 | } | |
1670 | } | |
1671 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1672 | ||
1da177e4 LT |
1673 | #ifdef CONFIG_PROC_FS |
1674 | static int psched_show(struct seq_file *seq, void *v) | |
1675 | { | |
3c0cfc13 PM |
1676 | struct timespec ts; |
1677 | ||
1678 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1679 | seq_printf(seq, "%08x %08x %08x %08x\n", |
641b9e0e | 1680 | (u32)NSEC_PER_USEC, (u32)PSCHED_US2NS(1), |
514bca32 | 1681 | 1000000, |
3c0cfc13 | 1682 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1683 | |
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | static int psched_open(struct inode *inode, struct file *file) | |
1688 | { | |
1689 | return single_open(file, psched_show, PDE(inode)->data); | |
1690 | } | |
1691 | ||
da7071d7 | 1692 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1693 | .owner = THIS_MODULE, |
1694 | .open = psched_open, | |
1695 | .read = seq_read, | |
1696 | .llseek = seq_lseek, | |
1697 | .release = single_release, | |
10297b99 | 1698 | }; |
1da177e4 LT |
1699 | #endif |
1700 | ||
1da177e4 LT |
1701 | static int __init pktsched_init(void) |
1702 | { | |
1da177e4 LT |
1703 | register_qdisc(&pfifo_qdisc_ops); |
1704 | register_qdisc(&bfifo_qdisc_ops); | |
457c4cbc | 1705 | proc_net_fops_create(&init_net, "psched", 0, &psched_fops); |
1da177e4 | 1706 | |
be577ddc TG |
1707 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
1708 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); | |
1709 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); | |
1710 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); | |
1711 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); | |
1712 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); | |
1713 | ||
1da177e4 LT |
1714 | return 0; |
1715 | } | |
1716 | ||
1717 | subsys_initcall(pktsched_init); |