Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_api.c Packet scheduler API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Fixes: | |
12 | * | |
13 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. | |
14 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
15 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
1da177e4 | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/errno.h> |
1da177e4 | 23 | #include <linux/skbuff.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/proc_fs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/list.h> | |
4179477f | 29 | #include <linux/hrtimer.h> |
25bfcd5a | 30 | #include <linux/lockdep.h> |
1da177e4 | 31 | |
457c4cbc | 32 | #include <net/net_namespace.h> |
b854272b | 33 | #include <net/sock.h> |
dc5fc579 | 34 | #include <net/netlink.h> |
1da177e4 LT |
35 | #include <net/pkt_sched.h> |
36 | ||
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 | ||
99c0db26 JP |
100 | ---peek |
101 | ||
102 | like dequeue but without removing a packet from the queue | |
103 | ||
1da177e4 LT |
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; | |
99c0db26 JP |
149 | if (qops->peek == NULL) { |
150 | if (qops->dequeue == NULL) { | |
151 | qops->peek = noop_qdisc_ops.peek; | |
152 | } else { | |
153 | rc = -EINVAL; | |
154 | goto out; | |
155 | } | |
156 | } | |
1da177e4 LT |
157 | if (qops->dequeue == NULL) |
158 | qops->dequeue = noop_qdisc_ops.dequeue; | |
159 | ||
160 | qops->next = NULL; | |
161 | *qp = qops; | |
162 | rc = 0; | |
163 | out: | |
164 | write_unlock(&qdisc_mod_lock); | |
165 | return rc; | |
166 | } | |
62e3ba1b | 167 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
168 | |
169 | int unregister_qdisc(struct Qdisc_ops *qops) | |
170 | { | |
171 | struct Qdisc_ops *q, **qp; | |
172 | int err = -ENOENT; | |
173 | ||
174 | write_lock(&qdisc_mod_lock); | |
175 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) | |
176 | if (q == qops) | |
177 | break; | |
178 | if (q) { | |
179 | *qp = q->next; | |
180 | q->next = NULL; | |
181 | err = 0; | |
182 | } | |
183 | write_unlock(&qdisc_mod_lock); | |
184 | return err; | |
185 | } | |
62e3ba1b | 186 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 LT |
187 | |
188 | /* We know handle. Find qdisc among all qdisc's attached to device | |
189 | (root qdisc, all its children, children of children etc.) | |
190 | */ | |
191 | ||
8123b421 DM |
192 | struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
193 | { | |
194 | struct Qdisc *q; | |
195 | ||
196 | if (!(root->flags & TCQ_F_BUILTIN) && | |
197 | root->handle == handle) | |
198 | return root; | |
199 | ||
200 | list_for_each_entry(q, &root->list, list) { | |
201 | if (q->handle == handle) | |
202 | return q; | |
203 | } | |
204 | return NULL; | |
205 | } | |
206 | ||
f6e0b239 JP |
207 | static void qdisc_list_add(struct Qdisc *q) |
208 | { | |
f6486d40 | 209 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
f6e0b239 | 210 | list_add_tail(&q->list, &qdisc_root_sleeping(q)->list); |
f6e0b239 JP |
211 | } |
212 | ||
213 | void qdisc_list_del(struct Qdisc *q) | |
214 | { | |
f6486d40 | 215 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
f6e0b239 | 216 | list_del(&q->list); |
f6e0b239 JP |
217 | } |
218 | EXPORT_SYMBOL(qdisc_list_del); | |
219 | ||
ead81cc5 | 220 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 221 | { |
30723673 | 222 | unsigned int i; |
f6e0b239 JP |
223 | struct Qdisc *q; |
224 | ||
30723673 DM |
225 | for (i = 0; i < dev->num_tx_queues; i++) { |
226 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
f6e0b239 | 227 | struct Qdisc *txq_root = txq->qdisc_sleeping; |
1da177e4 | 228 | |
8123b421 DM |
229 | q = qdisc_match_from_root(txq_root, handle); |
230 | if (q) | |
f6486d40 | 231 | goto out; |
1da177e4 | 232 | } |
f6e0b239 JP |
233 | |
234 | q = qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle); | |
f6486d40 | 235 | out: |
f6e0b239 | 236 | return q; |
1da177e4 LT |
237 | } |
238 | ||
239 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
240 | { | |
241 | unsigned long cl; | |
242 | struct Qdisc *leaf; | |
20fea08b | 243 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
244 | |
245 | if (cops == NULL) | |
246 | return NULL; | |
247 | cl = cops->get(p, classid); | |
248 | ||
249 | if (cl == 0) | |
250 | return NULL; | |
251 | leaf = cops->leaf(p, cl); | |
252 | cops->put(p, cl); | |
253 | return leaf; | |
254 | } | |
255 | ||
256 | /* Find queueing discipline by name */ | |
257 | ||
1e90474c | 258 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
259 | { |
260 | struct Qdisc_ops *q = NULL; | |
261 | ||
262 | if (kind) { | |
263 | read_lock(&qdisc_mod_lock); | |
264 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 265 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
266 | if (!try_module_get(q->owner)) |
267 | q = NULL; | |
268 | break; | |
269 | } | |
270 | } | |
271 | read_unlock(&qdisc_mod_lock); | |
272 | } | |
273 | return q; | |
274 | } | |
275 | ||
276 | static struct qdisc_rate_table *qdisc_rtab_list; | |
277 | ||
1e90474c | 278 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
279 | { |
280 | struct qdisc_rate_table *rtab; | |
281 | ||
282 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
283 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
284 | rtab->refcnt++; | |
285 | return rtab; | |
286 | } | |
287 | } | |
288 | ||
5feb5e1a PM |
289 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
290 | nla_len(tab) != TC_RTAB_SIZE) | |
1da177e4 LT |
291 | return NULL; |
292 | ||
293 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
294 | if (rtab) { | |
295 | rtab->rate = *r; | |
296 | rtab->refcnt = 1; | |
1e90474c | 297 | memcpy(rtab->data, nla_data(tab), 1024); |
1da177e4 LT |
298 | rtab->next = qdisc_rtab_list; |
299 | qdisc_rtab_list = rtab; | |
300 | } | |
301 | return rtab; | |
302 | } | |
62e3ba1b | 303 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
304 | |
305 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
306 | { | |
307 | struct qdisc_rate_table *rtab, **rtabp; | |
308 | ||
309 | if (!tab || --tab->refcnt) | |
310 | return; | |
311 | ||
312 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
313 | if (rtab == tab) { | |
314 | *rtabp = rtab->next; | |
315 | kfree(rtab); | |
316 | return; | |
317 | } | |
318 | } | |
319 | } | |
62e3ba1b | 320 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 321 | |
175f9c1b JK |
322 | static LIST_HEAD(qdisc_stab_list); |
323 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
324 | ||
325 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
326 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
327 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
328 | }; | |
329 | ||
330 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
331 | { | |
332 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
333 | struct qdisc_size_table *stab; | |
334 | struct tc_sizespec *s; | |
335 | unsigned int tsize = 0; | |
336 | u16 *tab = NULL; | |
337 | int err; | |
338 | ||
339 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
340 | if (err < 0) | |
341 | return ERR_PTR(err); | |
342 | if (!tb[TCA_STAB_BASE]) | |
343 | return ERR_PTR(-EINVAL); | |
344 | ||
345 | s = nla_data(tb[TCA_STAB_BASE]); | |
346 | ||
347 | if (s->tsize > 0) { | |
348 | if (!tb[TCA_STAB_DATA]) | |
349 | return ERR_PTR(-EINVAL); | |
350 | tab = nla_data(tb[TCA_STAB_DATA]); | |
351 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
352 | } | |
353 | ||
354 | if (!s || tsize != s->tsize || (!tab && tsize > 0)) | |
355 | return ERR_PTR(-EINVAL); | |
356 | ||
f3b9605d | 357 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
358 | |
359 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
360 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
361 | continue; | |
362 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
363 | continue; | |
364 | stab->refcnt++; | |
f3b9605d | 365 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
366 | return stab; |
367 | } | |
368 | ||
f3b9605d | 369 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
370 | |
371 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
372 | if (!stab) | |
373 | return ERR_PTR(-ENOMEM); | |
374 | ||
375 | stab->refcnt = 1; | |
376 | stab->szopts = *s; | |
377 | if (tsize > 0) | |
378 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
379 | ||
f3b9605d | 380 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 381 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 382 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
383 | |
384 | return stab; | |
385 | } | |
386 | ||
387 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
388 | { | |
389 | if (!tab) | |
390 | return; | |
391 | ||
f3b9605d | 392 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
393 | |
394 | if (--tab->refcnt == 0) { | |
395 | list_del(&tab->list); | |
396 | kfree(tab); | |
397 | } | |
398 | ||
f3b9605d | 399 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
400 | } |
401 | EXPORT_SYMBOL(qdisc_put_stab); | |
402 | ||
403 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
404 | { | |
405 | struct nlattr *nest; | |
406 | ||
407 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
408 | if (nest == NULL) |
409 | goto nla_put_failure; | |
175f9c1b JK |
410 | NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); |
411 | nla_nest_end(skb, nest); | |
412 | ||
413 | return skb->len; | |
414 | ||
415 | nla_put_failure: | |
416 | return -1; | |
417 | } | |
418 | ||
419 | void qdisc_calculate_pkt_len(struct sk_buff *skb, struct qdisc_size_table *stab) | |
420 | { | |
421 | int pkt_len, slot; | |
422 | ||
423 | pkt_len = skb->len + stab->szopts.overhead; | |
424 | if (unlikely(!stab->szopts.tsize)) | |
425 | goto out; | |
426 | ||
427 | slot = pkt_len + stab->szopts.cell_align; | |
428 | if (unlikely(slot < 0)) | |
429 | slot = 0; | |
430 | ||
431 | slot >>= stab->szopts.cell_log; | |
432 | if (likely(slot < stab->szopts.tsize)) | |
433 | pkt_len = stab->data[slot]; | |
434 | else | |
435 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
436 | (slot / stab->szopts.tsize) + | |
437 | stab->data[slot % stab->szopts.tsize]; | |
438 | ||
439 | pkt_len <<= stab->szopts.size_log; | |
440 | out: | |
441 | if (unlikely(pkt_len < 1)) | |
442 | pkt_len = 1; | |
443 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
444 | } | |
445 | EXPORT_SYMBOL(qdisc_calculate_pkt_len); | |
446 | ||
4179477f PM |
447 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
448 | { | |
449 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
450 | timer); | |
451 | ||
452 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
11274e5a | 453 | smp_wmb(); |
8608db03 | 454 | __netif_schedule(qdisc_root(wd->qdisc)); |
1936502d | 455 | |
4179477f PM |
456 | return HRTIMER_NORESTART; |
457 | } | |
458 | ||
459 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
460 | { | |
461 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
462 | wd->timer.function = qdisc_watchdog; | |
463 | wd->qdisc = qdisc; | |
464 | } | |
465 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
466 | ||
467 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
468 | { | |
469 | ktime_t time; | |
470 | ||
2540e051 JP |
471 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
472 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
473 | return; | |
474 | ||
4179477f PM |
475 | wd->qdisc->flags |= TCQ_F_THROTTLED; |
476 | time = ktime_set(0, 0); | |
477 | time = ktime_add_ns(time, PSCHED_US2NS(expires)); | |
478 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); | |
479 | } | |
480 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
481 | ||
482 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
483 | { | |
484 | hrtimer_cancel(&wd->timer); | |
485 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
486 | } | |
487 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 488 | |
a94f779f | 489 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
490 | { |
491 | unsigned int size = n * sizeof(struct hlist_head), i; | |
492 | struct hlist_head *h; | |
493 | ||
494 | if (size <= PAGE_SIZE) | |
495 | h = kmalloc(size, GFP_KERNEL); | |
496 | else | |
497 | h = (struct hlist_head *) | |
498 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
499 | ||
500 | if (h != NULL) { | |
501 | for (i = 0; i < n; i++) | |
502 | INIT_HLIST_HEAD(&h[i]); | |
503 | } | |
504 | return h; | |
505 | } | |
506 | ||
507 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
508 | { | |
509 | unsigned int size = n * sizeof(struct hlist_head); | |
510 | ||
511 | if (size <= PAGE_SIZE) | |
512 | kfree(h); | |
513 | else | |
514 | free_pages((unsigned long)h, get_order(size)); | |
515 | } | |
516 | ||
517 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
518 | { | |
519 | struct Qdisc_class_common *cl; | |
520 | struct hlist_node *n, *next; | |
521 | struct hlist_head *nhash, *ohash; | |
522 | unsigned int nsize, nmask, osize; | |
523 | unsigned int i, h; | |
524 | ||
525 | /* Rehash when load factor exceeds 0.75 */ | |
526 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
527 | return; | |
528 | nsize = clhash->hashsize * 2; | |
529 | nmask = nsize - 1; | |
530 | nhash = qdisc_class_hash_alloc(nsize); | |
531 | if (nhash == NULL) | |
532 | return; | |
533 | ||
534 | ohash = clhash->hash; | |
535 | osize = clhash->hashsize; | |
536 | ||
537 | sch_tree_lock(sch); | |
538 | for (i = 0; i < osize; i++) { | |
539 | hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) { | |
540 | h = qdisc_class_hash(cl->classid, nmask); | |
541 | hlist_add_head(&cl->hnode, &nhash[h]); | |
542 | } | |
543 | } | |
544 | clhash->hash = nhash; | |
545 | clhash->hashsize = nsize; | |
546 | clhash->hashmask = nmask; | |
547 | sch_tree_unlock(sch); | |
548 | ||
549 | qdisc_class_hash_free(ohash, osize); | |
550 | } | |
551 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
552 | ||
553 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
554 | { | |
555 | unsigned int size = 4; | |
556 | ||
557 | clhash->hash = qdisc_class_hash_alloc(size); | |
558 | if (clhash->hash == NULL) | |
559 | return -ENOMEM; | |
560 | clhash->hashsize = size; | |
561 | clhash->hashmask = size - 1; | |
562 | clhash->hashelems = 0; | |
563 | return 0; | |
564 | } | |
565 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
566 | ||
567 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
568 | { | |
569 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
570 | } | |
571 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
572 | ||
573 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
574 | struct Qdisc_class_common *cl) | |
575 | { | |
576 | unsigned int h; | |
577 | ||
578 | INIT_HLIST_NODE(&cl->hnode); | |
579 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
580 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
581 | clhash->hashelems++; | |
582 | } | |
583 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
584 | ||
585 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
586 | struct Qdisc_class_common *cl) | |
587 | { | |
588 | hlist_del(&cl->hnode); | |
589 | clhash->hashelems--; | |
590 | } | |
591 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
592 | ||
1da177e4 LT |
593 | /* Allocate an unique handle from space managed by kernel */ |
594 | ||
595 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
596 | { | |
597 | int i = 0x10000; | |
598 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
599 | ||
600 | do { | |
601 | autohandle += TC_H_MAKE(0x10000U, 0); | |
602 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
603 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
604 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
605 | ||
606 | return i>0 ? autohandle : 0; | |
607 | } | |
608 | ||
99194cff | 609 | /* Attach toplevel qdisc to device queue. */ |
1da177e4 | 610 | |
99194cff DM |
611 | static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
612 | struct Qdisc *qdisc) | |
1da177e4 | 613 | { |
8d50b53d | 614 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; |
53049978 | 615 | spinlock_t *root_lock; |
53049978 | 616 | |
666d9bbe | 617 | root_lock = qdisc_lock(oqdisc); |
53049978 DM |
618 | spin_lock_bh(root_lock); |
619 | ||
8d50b53d DM |
620 | /* Prune old scheduler */ |
621 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
622 | qdisc_reset(oqdisc); | |
1da177e4 | 623 | |
8d50b53d DM |
624 | /* ... and graft new one */ |
625 | if (qdisc == NULL) | |
626 | qdisc = &noop_qdisc; | |
627 | dev_queue->qdisc_sleeping = qdisc; | |
f7a54c13 | 628 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); |
1da177e4 | 629 | |
53049978 | 630 | spin_unlock_bh(root_lock); |
1da177e4 | 631 | |
1da177e4 LT |
632 | return oqdisc; |
633 | } | |
634 | ||
43effa1e PM |
635 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
636 | { | |
20fea08b | 637 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
638 | unsigned long cl; |
639 | u32 parentid; | |
640 | ||
641 | if (n == 0) | |
642 | return; | |
643 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
644 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
645 | return; | |
646 | ||
5ce2d488 | 647 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
648 | if (sch == NULL) { |
649 | WARN_ON(parentid != TC_H_ROOT); | |
650 | return; | |
651 | } | |
43effa1e PM |
652 | cops = sch->ops->cl_ops; |
653 | if (cops->qlen_notify) { | |
654 | cl = cops->get(sch, parentid); | |
655 | cops->qlen_notify(sch, cl); | |
656 | cops->put(sch, cl); | |
657 | } | |
658 | sch->q.qlen -= n; | |
659 | } | |
660 | } | |
661 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 662 | |
99194cff DM |
663 | static void notify_and_destroy(struct sk_buff *skb, struct nlmsghdr *n, u32 clid, |
664 | struct Qdisc *old, struct Qdisc *new) | |
665 | { | |
666 | if (new || old) | |
667 | qdisc_notify(skb, n, clid, old, new); | |
1da177e4 | 668 | |
4d8863a2 | 669 | if (old) |
99194cff | 670 | qdisc_destroy(old); |
99194cff DM |
671 | } |
672 | ||
673 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
674 | * to device "dev". | |
675 | * | |
676 | * When appropriate send a netlink notification using 'skb' | |
677 | * and "n". | |
678 | * | |
679 | * On success, destroy old qdisc. | |
1da177e4 LT |
680 | */ |
681 | ||
682 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
683 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
684 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 685 | { |
99194cff | 686 | struct Qdisc *q = old; |
1da177e4 | 687 | int err = 0; |
1da177e4 | 688 | |
10297b99 | 689 | if (parent == NULL) { |
99194cff DM |
690 | unsigned int i, num_q, ingress; |
691 | ||
692 | ingress = 0; | |
693 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
694 | if ((q && q->flags & TCQ_F_INGRESS) || |
695 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
696 | num_q = 1; |
697 | ingress = 1; | |
698 | } | |
699 | ||
700 | if (dev->flags & IFF_UP) | |
701 | dev_deactivate(dev); | |
702 | ||
703 | for (i = 0; i < num_q; i++) { | |
704 | struct netdev_queue *dev_queue = &dev->rx_queue; | |
705 | ||
706 | if (!ingress) | |
707 | dev_queue = netdev_get_tx_queue(dev, i); | |
708 | ||
8d50b53d DM |
709 | old = dev_graft_qdisc(dev_queue, new); |
710 | if (new && i > 0) | |
711 | atomic_inc(&new->refcnt); | |
712 | ||
99194cff | 713 | notify_and_destroy(skb, n, classid, old, new); |
1da177e4 | 714 | } |
99194cff DM |
715 | |
716 | if (dev->flags & IFF_UP) | |
717 | dev_activate(dev); | |
1da177e4 | 718 | } else { |
20fea08b | 719 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 LT |
720 | |
721 | err = -EINVAL; | |
722 | ||
723 | if (cops) { | |
724 | unsigned long cl = cops->get(parent, classid); | |
725 | if (cl) { | |
99194cff | 726 | err = cops->graft(parent, cl, new, &old); |
1da177e4 LT |
727 | cops->put(parent, cl); |
728 | } | |
729 | } | |
99194cff DM |
730 | if (!err) |
731 | notify_and_destroy(skb, n, classid, old, new); | |
1da177e4 LT |
732 | } |
733 | return err; | |
734 | } | |
735 | ||
25bfcd5a JP |
736 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
737 | static struct lock_class_key qdisc_tx_lock; | |
738 | static struct lock_class_key qdisc_rx_lock; | |
739 | ||
1da177e4 LT |
740 | /* |
741 | Allocate and initialize new qdisc. | |
742 | ||
743 | Parameters are passed via opt. | |
744 | */ | |
745 | ||
746 | static struct Qdisc * | |
bb949fbd DM |
747 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
748 | u32 parent, u32 handle, struct nlattr **tca, int *errp) | |
1da177e4 LT |
749 | { |
750 | int err; | |
1e90474c | 751 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
752 | struct Qdisc *sch; |
753 | struct Qdisc_ops *ops; | |
175f9c1b | 754 | struct qdisc_size_table *stab; |
1da177e4 LT |
755 | |
756 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 757 | #ifdef CONFIG_MODULES |
1da177e4 LT |
758 | if (ops == NULL && kind != NULL) { |
759 | char name[IFNAMSIZ]; | |
1e90474c | 760 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
761 | /* We dropped the RTNL semaphore in order to |
762 | * perform the module load. So, even if we | |
763 | * succeeded in loading the module we have to | |
764 | * tell the caller to replay the request. We | |
765 | * indicate this using -EAGAIN. | |
766 | * We replay the request because the device may | |
767 | * go away in the mean time. | |
768 | */ | |
769 | rtnl_unlock(); | |
770 | request_module("sch_%s", name); | |
771 | rtnl_lock(); | |
772 | ops = qdisc_lookup_ops(kind); | |
773 | if (ops != NULL) { | |
774 | /* We will try again qdisc_lookup_ops, | |
775 | * so don't keep a reference. | |
776 | */ | |
777 | module_put(ops->owner); | |
778 | err = -EAGAIN; | |
779 | goto err_out; | |
780 | } | |
781 | } | |
782 | } | |
783 | #endif | |
784 | ||
b9e2cc0f | 785 | err = -ENOENT; |
1da177e4 LT |
786 | if (ops == NULL) |
787 | goto err_out; | |
788 | ||
5ce2d488 | 789 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
790 | if (IS_ERR(sch)) { |
791 | err = PTR_ERR(sch); | |
1da177e4 | 792 | goto err_out2; |
3d54b82f | 793 | } |
1da177e4 | 794 | |
ffc8fefa PM |
795 | sch->parent = parent; |
796 | ||
3d54b82f | 797 | if (handle == TC_H_INGRESS) { |
1da177e4 | 798 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 799 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 800 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 801 | } else { |
fd44de7c PM |
802 | if (handle == 0) { |
803 | handle = qdisc_alloc_handle(dev); | |
804 | err = -ENOMEM; | |
805 | if (handle == 0) | |
806 | goto err_out3; | |
807 | } | |
25bfcd5a | 808 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1da177e4 LT |
809 | } |
810 | ||
3d54b82f | 811 | sch->handle = handle; |
1da177e4 | 812 | |
1e90474c | 813 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
814 | if (tca[TCA_STAB]) { |
815 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
816 | if (IS_ERR(stab)) { | |
817 | err = PTR_ERR(stab); | |
818 | goto err_out3; | |
819 | } | |
820 | sch->stab = stab; | |
821 | } | |
1e90474c | 822 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
823 | spinlock_t *root_lock; |
824 | ||
825 | if ((sch->parent != TC_H_ROOT) && | |
826 | !(sch->flags & TCQ_F_INGRESS)) | |
827 | root_lock = qdisc_root_sleeping_lock(sch); | |
828 | else | |
829 | root_lock = qdisc_lock(sch); | |
830 | ||
023e09a7 | 831 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f | 832 | root_lock, tca[TCA_RATE]); |
023e09a7 TG |
833 | if (err) { |
834 | /* | |
835 | * Any broken qdiscs that would require | |
836 | * a ops->reset() here? The qdisc was never | |
837 | * in action so it shouldn't be necessary. | |
838 | */ | |
839 | if (ops->destroy) | |
840 | ops->destroy(sch); | |
841 | goto err_out3; | |
842 | } | |
843 | } | |
f6e0b239 JP |
844 | |
845 | qdisc_list_add(sch); | |
1da177e4 | 846 | |
1da177e4 LT |
847 | return sch; |
848 | } | |
849 | err_out3: | |
175f9c1b | 850 | qdisc_put_stab(sch->stab); |
1da177e4 | 851 | dev_put(dev); |
3d54b82f | 852 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
853 | err_out2: |
854 | module_put(ops->owner); | |
855 | err_out: | |
856 | *errp = err; | |
1da177e4 LT |
857 | return NULL; |
858 | } | |
859 | ||
1e90474c | 860 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 861 | { |
175f9c1b JK |
862 | struct qdisc_size_table *stab = NULL; |
863 | int err = 0; | |
1da177e4 | 864 | |
175f9c1b | 865 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
866 | if (sch->ops->change == NULL) |
867 | return -EINVAL; | |
1e90474c | 868 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
869 | if (err) |
870 | return err; | |
871 | } | |
175f9c1b JK |
872 | |
873 | if (tca[TCA_STAB]) { | |
874 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
875 | if (IS_ERR(stab)) | |
876 | return PTR_ERR(stab); | |
877 | } | |
878 | ||
879 | qdisc_put_stab(sch->stab); | |
880 | sch->stab = stab; | |
881 | ||
1e90474c | 882 | if (tca[TCA_RATE]) |
1da177e4 | 883 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f JP |
884 | qdisc_root_sleeping_lock(sch), |
885 | tca[TCA_RATE]); | |
1da177e4 LT |
886 | return 0; |
887 | } | |
888 | ||
889 | struct check_loop_arg | |
890 | { | |
891 | struct qdisc_walker w; | |
892 | struct Qdisc *p; | |
893 | int depth; | |
894 | }; | |
895 | ||
896 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
897 | ||
898 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
899 | { | |
900 | struct check_loop_arg arg; | |
901 | ||
902 | if (q->ops->cl_ops == NULL) | |
903 | return 0; | |
904 | ||
905 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
906 | arg.w.fn = check_loop_fn; | |
907 | arg.depth = depth; | |
908 | arg.p = p; | |
909 | q->ops->cl_ops->walk(q, &arg.w); | |
910 | return arg.w.stop ? -ELOOP : 0; | |
911 | } | |
912 | ||
913 | static int | |
914 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
915 | { | |
916 | struct Qdisc *leaf; | |
20fea08b | 917 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
918 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
919 | ||
920 | leaf = cops->leaf(q, cl); | |
921 | if (leaf) { | |
922 | if (leaf == arg->p || arg->depth > 7) | |
923 | return -ELOOP; | |
924 | return check_loop(leaf, arg->p, arg->depth + 1); | |
925 | } | |
926 | return 0; | |
927 | } | |
928 | ||
929 | /* | |
930 | * Delete/get qdisc. | |
931 | */ | |
932 | ||
933 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
934 | { | |
3b1e0a65 | 935 | struct net *net = sock_net(skb->sk); |
1da177e4 | 936 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 937 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
938 | struct net_device *dev; |
939 | u32 clid = tcm->tcm_parent; | |
940 | struct Qdisc *q = NULL; | |
941 | struct Qdisc *p = NULL; | |
942 | int err; | |
943 | ||
b854272b DL |
944 | if (net != &init_net) |
945 | return -EINVAL; | |
946 | ||
881d966b | 947 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
948 | return -ENODEV; |
949 | ||
1e90474c PM |
950 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
951 | if (err < 0) | |
952 | return err; | |
953 | ||
1da177e4 LT |
954 | if (clid) { |
955 | if (clid != TC_H_ROOT) { | |
956 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
957 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
958 | return -ENOENT; | |
959 | q = qdisc_leaf(p, clid); | |
960 | } else { /* ingress */ | |
8123b421 | 961 | q = dev->rx_queue.qdisc_sleeping; |
10297b99 | 962 | } |
1da177e4 | 963 | } else { |
e8a0464c DM |
964 | struct netdev_queue *dev_queue; |
965 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 966 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
967 | } |
968 | if (!q) | |
969 | return -ENOENT; | |
970 | ||
971 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
972 | return -EINVAL; | |
973 | } else { | |
974 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
975 | return -ENOENT; | |
976 | } | |
977 | ||
1e90474c | 978 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
979 | return -EINVAL; |
980 | ||
981 | if (n->nlmsg_type == RTM_DELQDISC) { | |
982 | if (!clid) | |
983 | return -EINVAL; | |
984 | if (q->handle == 0) | |
985 | return -ENOENT; | |
99194cff | 986 | if ((err = qdisc_graft(dev, p, skb, n, clid, NULL, q)) != 0) |
1da177e4 | 987 | return err; |
1da177e4 LT |
988 | } else { |
989 | qdisc_notify(skb, n, clid, NULL, q); | |
990 | } | |
991 | return 0; | |
992 | } | |
993 | ||
994 | /* | |
995 | Create/change qdisc. | |
996 | */ | |
997 | ||
998 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
999 | { | |
3b1e0a65 | 1000 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1001 | struct tcmsg *tcm; |
1e90474c | 1002 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1003 | struct net_device *dev; |
1004 | u32 clid; | |
1005 | struct Qdisc *q, *p; | |
1006 | int err; | |
1007 | ||
b854272b DL |
1008 | if (net != &init_net) |
1009 | return -EINVAL; | |
1010 | ||
1da177e4 LT |
1011 | replay: |
1012 | /* Reinit, just in case something touches this. */ | |
1013 | tcm = NLMSG_DATA(n); | |
1da177e4 LT |
1014 | clid = tcm->tcm_parent; |
1015 | q = p = NULL; | |
1016 | ||
881d966b | 1017 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1018 | return -ENODEV; |
1019 | ||
1e90474c PM |
1020 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1021 | if (err < 0) | |
1022 | return err; | |
1023 | ||
1da177e4 LT |
1024 | if (clid) { |
1025 | if (clid != TC_H_ROOT) { | |
1026 | if (clid != TC_H_INGRESS) { | |
1027 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
1028 | return -ENOENT; | |
1029 | q = qdisc_leaf(p, clid); | |
1030 | } else { /*ingress */ | |
8123b421 | 1031 | q = dev->rx_queue.qdisc_sleeping; |
1da177e4 LT |
1032 | } |
1033 | } else { | |
e8a0464c DM |
1034 | struct netdev_queue *dev_queue; |
1035 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 1036 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | /* It may be default qdisc, ignore it */ | |
1040 | if (q && q->handle == 0) | |
1041 | q = NULL; | |
1042 | ||
1043 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1044 | if (tcm->tcm_handle) { | |
1045 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
1046 | return -EEXIST; | |
1047 | if (TC_H_MIN(tcm->tcm_handle)) | |
1048 | return -EINVAL; | |
1049 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
1050 | goto create_n_graft; | |
1051 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1052 | return -EEXIST; | |
1e90474c | 1053 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1054 | return -EINVAL; |
1055 | if (q == p || | |
1056 | (p && check_loop(q, p, 0))) | |
1057 | return -ELOOP; | |
1058 | atomic_inc(&q->refcnt); | |
1059 | goto graft; | |
1060 | } else { | |
1061 | if (q == NULL) | |
1062 | goto create_n_graft; | |
1063 | ||
1064 | /* This magic test requires explanation. | |
1065 | * | |
1066 | * We know, that some child q is already | |
1067 | * attached to this parent and have choice: | |
1068 | * either to change it or to create/graft new one. | |
1069 | * | |
1070 | * 1. We are allowed to create/graft only | |
1071 | * if CREATE and REPLACE flags are set. | |
1072 | * | |
1073 | * 2. If EXCL is set, requestor wanted to say, | |
1074 | * that qdisc tcm_handle is not expected | |
1075 | * to exist, so that we choose create/graft too. | |
1076 | * | |
1077 | * 3. The last case is when no flags are set. | |
1078 | * Alas, it is sort of hole in API, we | |
1079 | * cannot decide what to do unambiguously. | |
1080 | * For now we select create/graft, if | |
1081 | * user gave KIND, which does not match existing. | |
1082 | */ | |
1083 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
1084 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
1085 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
1e90474c PM |
1086 | (tca[TCA_KIND] && |
1087 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1088 | goto create_n_graft; |
1089 | } | |
1090 | } | |
1091 | } else { | |
1092 | if (!tcm->tcm_handle) | |
1093 | return -EINVAL; | |
1094 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1095 | } | |
1096 | ||
1097 | /* Change qdisc parameters */ | |
1098 | if (q == NULL) | |
1099 | return -ENOENT; | |
1100 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1101 | return -EEXIST; | |
1e90474c | 1102 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1103 | return -EINVAL; |
1104 | err = qdisc_change(q, tca); | |
1105 | if (err == 0) | |
1106 | qdisc_notify(skb, n, clid, NULL, q); | |
1107 | return err; | |
1108 | ||
1109 | create_n_graft: | |
1110 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
1111 | return -ENOENT; | |
1112 | if (clid == TC_H_INGRESS) | |
bb949fbd DM |
1113 | q = qdisc_create(dev, &dev->rx_queue, |
1114 | tcm->tcm_parent, tcm->tcm_parent, | |
ffc8fefa | 1115 | tca, &err); |
10297b99 | 1116 | else |
e8a0464c | 1117 | q = qdisc_create(dev, netdev_get_tx_queue(dev, 0), |
bb949fbd | 1118 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1119 | tca, &err); |
1da177e4 LT |
1120 | if (q == NULL) { |
1121 | if (err == -EAGAIN) | |
1122 | goto replay; | |
1123 | return err; | |
1124 | } | |
1125 | ||
1126 | graft: | |
e5befbd9 IJ |
1127 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1128 | if (err) { | |
1129 | if (q) | |
1130 | qdisc_destroy(q); | |
1131 | return err; | |
1da177e4 | 1132 | } |
e5befbd9 | 1133 | |
1da177e4 LT |
1134 | return 0; |
1135 | } | |
1136 | ||
1137 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 1138 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1139 | { |
1140 | struct tcmsg *tcm; | |
1141 | struct nlmsghdr *nlh; | |
27a884dc | 1142 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1143 | struct gnet_dump d; |
1144 | ||
e431b8c0 | 1145 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1146 | tcm = NLMSG_DATA(nlh); |
1147 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1148 | tcm->tcm__pad1 = 0; |
1149 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1150 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1151 | tcm->tcm_parent = clid; |
1152 | tcm->tcm_handle = q->handle; | |
1153 | tcm->tcm_info = atomic_read(&q->refcnt); | |
57e1c487 | 1154 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1155 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1156 | goto nla_put_failure; |
1da177e4 LT |
1157 | q->qstats.qlen = q->q.qlen; |
1158 | ||
175f9c1b JK |
1159 | if (q->stab && qdisc_dump_stab(skb, q->stab) < 0) |
1160 | goto nla_put_failure; | |
1161 | ||
102396ae JP |
1162 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1163 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1164 | goto nla_put_failure; |
1da177e4 LT |
1165 | |
1166 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1167 | goto nla_put_failure; |
1da177e4 LT |
1168 | |
1169 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
1da177e4 | 1170 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
1da177e4 | 1171 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1172 | goto nla_put_failure; |
10297b99 | 1173 | |
1da177e4 | 1174 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1175 | goto nla_put_failure; |
10297b99 | 1176 | |
27a884dc | 1177 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1178 | return skb->len; |
1179 | ||
1180 | nlmsg_failure: | |
1e90474c | 1181 | nla_put_failure: |
dc5fc579 | 1182 | nlmsg_trim(skb, b); |
1da177e4 LT |
1183 | return -1; |
1184 | } | |
1185 | ||
1186 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1187 | u32 clid, struct Qdisc *old, struct Qdisc *new) | |
1188 | { | |
1189 | struct sk_buff *skb; | |
1190 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1191 | ||
1192 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1193 | if (!skb) | |
1194 | return -ENOBUFS; | |
1195 | ||
1196 | if (old && old->handle) { | |
1197 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) | |
1198 | goto err_out; | |
1199 | } | |
1200 | if (new) { | |
1201 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
1202 | goto err_out; | |
1203 | } | |
1204 | ||
1205 | if (skb->len) | |
97c53cac | 1206 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1207 | |
1208 | err_out: | |
1209 | kfree_skb(skb); | |
1210 | return -EINVAL; | |
1211 | } | |
1212 | ||
30723673 DM |
1213 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1214 | { | |
1215 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1216 | } | |
1217 | ||
1218 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, | |
1219 | struct netlink_callback *cb, | |
1220 | int *q_idx_p, int s_q_idx) | |
1221 | { | |
1222 | int ret = 0, q_idx = *q_idx_p; | |
1223 | struct Qdisc *q; | |
1224 | ||
1225 | if (!root) | |
1226 | return 0; | |
1227 | ||
1228 | q = root; | |
1229 | if (q_idx < s_q_idx) { | |
1230 | q_idx++; | |
1231 | } else { | |
1232 | if (!tc_qdisc_dump_ignore(q) && | |
1233 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1234 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1235 | goto done; | |
1236 | q_idx++; | |
1237 | } | |
1238 | list_for_each_entry(q, &root->list, list) { | |
1239 | if (q_idx < s_q_idx) { | |
1240 | q_idx++; | |
1241 | continue; | |
1242 | } | |
1243 | if (!tc_qdisc_dump_ignore(q) && | |
1244 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1245 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1246 | goto done; | |
1247 | q_idx++; | |
1248 | } | |
1249 | ||
1250 | out: | |
1251 | *q_idx_p = q_idx; | |
1252 | return ret; | |
1253 | done: | |
1254 | ret = -1; | |
1255 | goto out; | |
1256 | } | |
1257 | ||
1da177e4 LT |
1258 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1259 | { | |
3b1e0a65 | 1260 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1261 | int idx, q_idx; |
1262 | int s_idx, s_q_idx; | |
1263 | struct net_device *dev; | |
1da177e4 | 1264 | |
b854272b DL |
1265 | if (net != &init_net) |
1266 | return 0; | |
1267 | ||
1da177e4 LT |
1268 | s_idx = cb->args[0]; |
1269 | s_q_idx = q_idx = cb->args[1]; | |
1270 | read_lock(&dev_base_lock); | |
7562f876 | 1271 | idx = 0; |
881d966b | 1272 | for_each_netdev(&init_net, dev) { |
30723673 DM |
1273 | struct netdev_queue *dev_queue; |
1274 | ||
1da177e4 | 1275 | if (idx < s_idx) |
7562f876 | 1276 | goto cont; |
1da177e4 LT |
1277 | if (idx > s_idx) |
1278 | s_q_idx = 0; | |
1da177e4 | 1279 | q_idx = 0; |
30723673 DM |
1280 | |
1281 | dev_queue = netdev_get_tx_queue(dev, 0); | |
827ebd64 | 1282 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1283 | goto done; |
1284 | ||
1285 | dev_queue = &dev->rx_queue; | |
827ebd64 | 1286 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1287 | goto done; |
1288 | ||
7562f876 PE |
1289 | cont: |
1290 | idx++; | |
1da177e4 LT |
1291 | } |
1292 | ||
1293 | done: | |
1294 | read_unlock(&dev_base_lock); | |
1295 | ||
1296 | cb->args[0] = idx; | |
1297 | cb->args[1] = q_idx; | |
1298 | ||
1299 | return skb->len; | |
1300 | } | |
1301 | ||
1302 | ||
1303 | ||
1304 | /************************************************ | |
1305 | * Traffic classes manipulation. * | |
1306 | ************************************************/ | |
1307 | ||
1308 | ||
1309 | ||
1310 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1311 | { | |
3b1e0a65 | 1312 | struct net *net = sock_net(skb->sk); |
b0e1e646 | 1313 | struct netdev_queue *dev_queue; |
1da177e4 | 1314 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 1315 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1316 | struct net_device *dev; |
1317 | struct Qdisc *q = NULL; | |
20fea08b | 1318 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1319 | unsigned long cl = 0; |
1320 | unsigned long new_cl; | |
1321 | u32 pid = tcm->tcm_parent; | |
1322 | u32 clid = tcm->tcm_handle; | |
1323 | u32 qid = TC_H_MAJ(clid); | |
1324 | int err; | |
1325 | ||
b854272b DL |
1326 | if (net != &init_net) |
1327 | return -EINVAL; | |
1328 | ||
881d966b | 1329 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1330 | return -ENODEV; |
1331 | ||
1e90474c PM |
1332 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1333 | if (err < 0) | |
1334 | return err; | |
1335 | ||
1da177e4 LT |
1336 | /* |
1337 | parent == TC_H_UNSPEC - unspecified parent. | |
1338 | parent == TC_H_ROOT - class is root, which has no parent. | |
1339 | parent == X:0 - parent is root class. | |
1340 | parent == X:Y - parent is a node in hierarchy. | |
1341 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1342 | ||
1343 | handle == 0:0 - generate handle from kernel pool. | |
1344 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1345 | handle == X:Y - clear. | |
1346 | handle == X:0 - root class. | |
1347 | */ | |
1348 | ||
1349 | /* Step 1. Determine qdisc handle X:0 */ | |
1350 | ||
e8a0464c | 1351 | dev_queue = netdev_get_tx_queue(dev, 0); |
1da177e4 LT |
1352 | if (pid != TC_H_ROOT) { |
1353 | u32 qid1 = TC_H_MAJ(pid); | |
1354 | ||
1355 | if (qid && qid1) { | |
1356 | /* If both majors are known, they must be identical. */ | |
1357 | if (qid != qid1) | |
1358 | return -EINVAL; | |
1359 | } else if (qid1) { | |
1360 | qid = qid1; | |
1361 | } else if (qid == 0) | |
b0e1e646 | 1362 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1363 | |
1364 | /* Now qid is genuine qdisc handle consistent | |
1365 | both with parent and child. | |
1366 | ||
1367 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
1368 | */ | |
1369 | if (pid) | |
1370 | pid = TC_H_MAKE(qid, pid); | |
1371 | } else { | |
1372 | if (qid == 0) | |
b0e1e646 | 1373 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1374 | } |
1375 | ||
1376 | /* OK. Locate qdisc */ | |
10297b99 | 1377 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
1da177e4 LT |
1378 | return -ENOENT; |
1379 | ||
1380 | /* An check that it supports classes */ | |
1381 | cops = q->ops->cl_ops; | |
1382 | if (cops == NULL) | |
1383 | return -EINVAL; | |
1384 | ||
1385 | /* Now try to get class */ | |
1386 | if (clid == 0) { | |
1387 | if (pid == TC_H_ROOT) | |
1388 | clid = qid; | |
1389 | } else | |
1390 | clid = TC_H_MAKE(qid, clid); | |
1391 | ||
1392 | if (clid) | |
1393 | cl = cops->get(q, clid); | |
1394 | ||
1395 | if (cl == 0) { | |
1396 | err = -ENOENT; | |
1397 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
1398 | goto out; | |
1399 | } else { | |
1400 | switch (n->nlmsg_type) { | |
10297b99 | 1401 | case RTM_NEWTCLASS: |
1da177e4 LT |
1402 | err = -EEXIST; |
1403 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1404 | goto out; | |
1405 | break; | |
1406 | case RTM_DELTCLASS: | |
1407 | err = cops->delete(q, cl); | |
1408 | if (err == 0) | |
1409 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); | |
1410 | goto out; | |
1411 | case RTM_GETTCLASS: | |
1412 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); | |
1413 | goto out; | |
1414 | default: | |
1415 | err = -EINVAL; | |
1416 | goto out; | |
1417 | } | |
1418 | } | |
1419 | ||
1420 | new_cl = cl; | |
1421 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1422 | if (err == 0) | |
1423 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); | |
1424 | ||
1425 | out: | |
1426 | if (cl) | |
1427 | cops->put(q, cl); | |
1428 | ||
1429 | return err; | |
1430 | } | |
1431 | ||
1432 | ||
1433 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1434 | unsigned long cl, | |
e431b8c0 | 1435 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1436 | { |
1437 | struct tcmsg *tcm; | |
1438 | struct nlmsghdr *nlh; | |
27a884dc | 1439 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1440 | struct gnet_dump d; |
20fea08b | 1441 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1442 | |
e431b8c0 | 1443 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1444 | tcm = NLMSG_DATA(nlh); |
1445 | tcm->tcm_family = AF_UNSPEC; | |
5ce2d488 | 1446 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1447 | tcm->tcm_parent = q->handle; |
1448 | tcm->tcm_handle = q->handle; | |
1449 | tcm->tcm_info = 0; | |
57e1c487 | 1450 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1451 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1452 | goto nla_put_failure; |
1da177e4 | 1453 | |
102396ae JP |
1454 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1455 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1456 | goto nla_put_failure; |
1da177e4 LT |
1457 | |
1458 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1459 | goto nla_put_failure; |
1da177e4 LT |
1460 | |
1461 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1462 | goto nla_put_failure; |
1da177e4 | 1463 | |
27a884dc | 1464 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1465 | return skb->len; |
1466 | ||
1467 | nlmsg_failure: | |
1e90474c | 1468 | nla_put_failure: |
dc5fc579 | 1469 | nlmsg_trim(skb, b); |
1da177e4 LT |
1470 | return -1; |
1471 | } | |
1472 | ||
1473 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1474 | struct Qdisc *q, unsigned long cl, int event) | |
1475 | { | |
1476 | struct sk_buff *skb; | |
1477 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1478 | ||
1479 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1480 | if (!skb) | |
1481 | return -ENOBUFS; | |
1482 | ||
1483 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1484 | kfree_skb(skb); | |
1485 | return -EINVAL; | |
1486 | } | |
1487 | ||
97c53cac | 1488 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1489 | } |
1490 | ||
1491 | struct qdisc_dump_args | |
1492 | { | |
1493 | struct qdisc_walker w; | |
1494 | struct sk_buff *skb; | |
1495 | struct netlink_callback *cb; | |
1496 | }; | |
1497 | ||
1498 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1499 | { | |
1500 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1501 | ||
1502 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1503 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1504 | } | |
1505 | ||
30723673 DM |
1506 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1507 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1508 | int *t_p, int s_t) | |
1509 | { | |
1510 | struct qdisc_dump_args arg; | |
1511 | ||
1512 | if (tc_qdisc_dump_ignore(q) || | |
1513 | *t_p < s_t || !q->ops->cl_ops || | |
1514 | (tcm->tcm_parent && | |
1515 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1516 | (*t_p)++; | |
1517 | return 0; | |
1518 | } | |
1519 | if (*t_p > s_t) | |
1520 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1521 | arg.w.fn = qdisc_class_dump; | |
1522 | arg.skb = skb; | |
1523 | arg.cb = cb; | |
1524 | arg.w.stop = 0; | |
1525 | arg.w.skip = cb->args[1]; | |
1526 | arg.w.count = 0; | |
1527 | q->ops->cl_ops->walk(q, &arg.w); | |
1528 | cb->args[1] = arg.w.count; | |
1529 | if (arg.w.stop) | |
1530 | return -1; | |
1531 | (*t_p)++; | |
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1536 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1537 | int *t_p, int s_t) | |
1538 | { | |
1539 | struct Qdisc *q; | |
1540 | ||
1541 | if (!root) | |
1542 | return 0; | |
1543 | ||
1544 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1545 | return -1; | |
1546 | ||
1547 | list_for_each_entry(q, &root->list, list) { | |
1548 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1549 | return -1; | |
1550 | } | |
1551 | ||
1552 | return 0; | |
1553 | } | |
1554 | ||
1da177e4 LT |
1555 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1556 | { | |
30723673 | 1557 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
3b1e0a65 | 1558 | struct net *net = sock_net(skb->sk); |
30723673 | 1559 | struct netdev_queue *dev_queue; |
1da177e4 | 1560 | struct net_device *dev; |
30723673 | 1561 | int t, s_t; |
1da177e4 | 1562 | |
b854272b DL |
1563 | if (net != &init_net) |
1564 | return 0; | |
1565 | ||
1da177e4 LT |
1566 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
1567 | return 0; | |
881d966b | 1568 | if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1569 | return 0; |
1570 | ||
1571 | s_t = cb->args[0]; | |
1572 | t = 0; | |
1573 | ||
30723673 | 1574 | dev_queue = netdev_get_tx_queue(dev, 0); |
8123b421 | 1575 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1576 | goto done; |
1577 | ||
1578 | dev_queue = &dev->rx_queue; | |
8123b421 | 1579 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 | 1580 | goto done; |
1da177e4 | 1581 | |
30723673 | 1582 | done: |
1da177e4 LT |
1583 | cb->args[0] = t; |
1584 | ||
1585 | dev_put(dev); | |
1586 | return skb->len; | |
1587 | } | |
1588 | ||
1589 | /* Main classifier routine: scans classifier chain attached | |
1590 | to this qdisc, (optionally) tests for protocol and asks | |
1591 | specific classifiers. | |
1592 | */ | |
73ca4918 PM |
1593 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1594 | struct tcf_result *res) | |
1595 | { | |
1596 | __be16 protocol = skb->protocol; | |
1597 | int err = 0; | |
1598 | ||
1599 | for (; tp; tp = tp->next) { | |
1600 | if ((tp->protocol == protocol || | |
1601 | tp->protocol == htons(ETH_P_ALL)) && | |
1602 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1603 | #ifdef CONFIG_NET_CLS_ACT | |
1604 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1605 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1606 | #endif | |
1607 | return err; | |
1608 | } | |
1609 | } | |
1610 | return -1; | |
1611 | } | |
1612 | EXPORT_SYMBOL(tc_classify_compat); | |
1613 | ||
1da177e4 | 1614 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1615 | struct tcf_result *res) |
1da177e4 LT |
1616 | { |
1617 | int err = 0; | |
73ca4918 | 1618 | __be16 protocol; |
1da177e4 LT |
1619 | #ifdef CONFIG_NET_CLS_ACT |
1620 | struct tcf_proto *otp = tp; | |
1621 | reclassify: | |
1622 | #endif | |
1623 | protocol = skb->protocol; | |
1624 | ||
73ca4918 | 1625 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1626 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1627 | if (err == TC_ACT_RECLASSIFY) { |
1628 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1629 | tp = otp; | |
1630 | ||
1631 | if (verd++ >= MAX_REC_LOOP) { | |
1632 | printk("rule prio %u protocol %02x reclassify loop, " | |
1633 | "packet dropped\n", | |
1634 | tp->prio&0xffff, ntohs(tp->protocol)); | |
1635 | return TC_ACT_SHOT; | |
1da177e4 | 1636 | } |
73ca4918 PM |
1637 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1638 | goto reclassify; | |
1da177e4 | 1639 | } |
73ca4918 PM |
1640 | #endif |
1641 | return err; | |
1da177e4 | 1642 | } |
73ca4918 | 1643 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1644 | |
a48b5a61 PM |
1645 | void tcf_destroy(struct tcf_proto *tp) |
1646 | { | |
1647 | tp->ops->destroy(tp); | |
1648 | module_put(tp->ops->owner); | |
1649 | kfree(tp); | |
1650 | } | |
1651 | ||
ff31ab56 | 1652 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1653 | { |
1654 | struct tcf_proto *tp; | |
1655 | ||
ff31ab56 PM |
1656 | while ((tp = *fl) != NULL) { |
1657 | *fl = tp->next; | |
a48b5a61 PM |
1658 | tcf_destroy(tp); |
1659 | } | |
1660 | } | |
1661 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1662 | ||
1da177e4 LT |
1663 | #ifdef CONFIG_PROC_FS |
1664 | static int psched_show(struct seq_file *seq, void *v) | |
1665 | { | |
3c0cfc13 PM |
1666 | struct timespec ts; |
1667 | ||
1668 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1669 | seq_printf(seq, "%08x %08x %08x %08x\n", |
641b9e0e | 1670 | (u32)NSEC_PER_USEC, (u32)PSCHED_US2NS(1), |
514bca32 | 1671 | 1000000, |
3c0cfc13 | 1672 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1673 | |
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | static int psched_open(struct inode *inode, struct file *file) | |
1678 | { | |
1679 | return single_open(file, psched_show, PDE(inode)->data); | |
1680 | } | |
1681 | ||
da7071d7 | 1682 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1683 | .owner = THIS_MODULE, |
1684 | .open = psched_open, | |
1685 | .read = seq_read, | |
1686 | .llseek = seq_lseek, | |
1687 | .release = single_release, | |
10297b99 | 1688 | }; |
1da177e4 LT |
1689 | #endif |
1690 | ||
1da177e4 LT |
1691 | static int __init pktsched_init(void) |
1692 | { | |
1da177e4 LT |
1693 | register_qdisc(&pfifo_qdisc_ops); |
1694 | register_qdisc(&bfifo_qdisc_ops); | |
457c4cbc | 1695 | proc_net_fops_create(&init_net, "psched", 0, &psched_fops); |
1da177e4 | 1696 | |
be577ddc TG |
1697 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
1698 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); | |
1699 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); | |
1700 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); | |
1701 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); | |
1702 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); | |
1703 | ||
1da177e4 LT |
1704 | return 0; |
1705 | } | |
1706 | ||
1707 | subsys_initcall(pktsched_init); |