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 | /* |
208 | * This lock is needed until some qdiscs stop calling qdisc_tree_decrease_qlen() | |
209 | * without rtnl_lock(); currently hfsc_dequeue(), netem_dequeue(), tbf_dequeue() | |
210 | */ | |
211 | static DEFINE_SPINLOCK(qdisc_list_lock); | |
212 | ||
213 | static void qdisc_list_add(struct Qdisc *q) | |
214 | { | |
215 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { | |
216 | spin_lock_bh(&qdisc_list_lock); | |
217 | list_add_tail(&q->list, &qdisc_root_sleeping(q)->list); | |
218 | spin_unlock_bh(&qdisc_list_lock); | |
219 | } | |
220 | } | |
221 | ||
222 | void qdisc_list_del(struct Qdisc *q) | |
223 | { | |
224 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { | |
225 | spin_lock_bh(&qdisc_list_lock); | |
226 | list_del(&q->list); | |
227 | spin_unlock_bh(&qdisc_list_lock); | |
228 | } | |
229 | } | |
230 | EXPORT_SYMBOL(qdisc_list_del); | |
231 | ||
ead81cc5 | 232 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 233 | { |
30723673 | 234 | unsigned int i; |
f6e0b239 JP |
235 | struct Qdisc *q; |
236 | ||
237 | spin_lock_bh(&qdisc_list_lock); | |
30723673 DM |
238 | |
239 | for (i = 0; i < dev->num_tx_queues; i++) { | |
240 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
f6e0b239 | 241 | struct Qdisc *txq_root = txq->qdisc_sleeping; |
1da177e4 | 242 | |
8123b421 DM |
243 | q = qdisc_match_from_root(txq_root, handle); |
244 | if (q) | |
f6e0b239 | 245 | goto unlock; |
1da177e4 | 246 | } |
f6e0b239 JP |
247 | |
248 | q = qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle); | |
249 | ||
250 | unlock: | |
251 | spin_unlock_bh(&qdisc_list_lock); | |
252 | ||
253 | return q; | |
1da177e4 LT |
254 | } |
255 | ||
256 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
257 | { | |
258 | unsigned long cl; | |
259 | struct Qdisc *leaf; | |
20fea08b | 260 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
261 | |
262 | if (cops == NULL) | |
263 | return NULL; | |
264 | cl = cops->get(p, classid); | |
265 | ||
266 | if (cl == 0) | |
267 | return NULL; | |
268 | leaf = cops->leaf(p, cl); | |
269 | cops->put(p, cl); | |
270 | return leaf; | |
271 | } | |
272 | ||
273 | /* Find queueing discipline by name */ | |
274 | ||
1e90474c | 275 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
276 | { |
277 | struct Qdisc_ops *q = NULL; | |
278 | ||
279 | if (kind) { | |
280 | read_lock(&qdisc_mod_lock); | |
281 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 282 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
283 | if (!try_module_get(q->owner)) |
284 | q = NULL; | |
285 | break; | |
286 | } | |
287 | } | |
288 | read_unlock(&qdisc_mod_lock); | |
289 | } | |
290 | return q; | |
291 | } | |
292 | ||
293 | static struct qdisc_rate_table *qdisc_rtab_list; | |
294 | ||
1e90474c | 295 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
296 | { |
297 | struct qdisc_rate_table *rtab; | |
298 | ||
299 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
300 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
301 | rtab->refcnt++; | |
302 | return rtab; | |
303 | } | |
304 | } | |
305 | ||
5feb5e1a PM |
306 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
307 | nla_len(tab) != TC_RTAB_SIZE) | |
1da177e4 LT |
308 | return NULL; |
309 | ||
310 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
311 | if (rtab) { | |
312 | rtab->rate = *r; | |
313 | rtab->refcnt = 1; | |
1e90474c | 314 | memcpy(rtab->data, nla_data(tab), 1024); |
1da177e4 LT |
315 | rtab->next = qdisc_rtab_list; |
316 | qdisc_rtab_list = rtab; | |
317 | } | |
318 | return rtab; | |
319 | } | |
62e3ba1b | 320 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
321 | |
322 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
323 | { | |
324 | struct qdisc_rate_table *rtab, **rtabp; | |
325 | ||
326 | if (!tab || --tab->refcnt) | |
327 | return; | |
328 | ||
329 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
330 | if (rtab == tab) { | |
331 | *rtabp = rtab->next; | |
332 | kfree(rtab); | |
333 | return; | |
334 | } | |
335 | } | |
336 | } | |
62e3ba1b | 337 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 338 | |
175f9c1b JK |
339 | static LIST_HEAD(qdisc_stab_list); |
340 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
341 | ||
342 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
343 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
344 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
345 | }; | |
346 | ||
347 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
348 | { | |
349 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
350 | struct qdisc_size_table *stab; | |
351 | struct tc_sizespec *s; | |
352 | unsigned int tsize = 0; | |
353 | u16 *tab = NULL; | |
354 | int err; | |
355 | ||
356 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
357 | if (err < 0) | |
358 | return ERR_PTR(err); | |
359 | if (!tb[TCA_STAB_BASE]) | |
360 | return ERR_PTR(-EINVAL); | |
361 | ||
362 | s = nla_data(tb[TCA_STAB_BASE]); | |
363 | ||
364 | if (s->tsize > 0) { | |
365 | if (!tb[TCA_STAB_DATA]) | |
366 | return ERR_PTR(-EINVAL); | |
367 | tab = nla_data(tb[TCA_STAB_DATA]); | |
368 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
369 | } | |
370 | ||
371 | if (!s || tsize != s->tsize || (!tab && tsize > 0)) | |
372 | return ERR_PTR(-EINVAL); | |
373 | ||
f3b9605d | 374 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
375 | |
376 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
377 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
378 | continue; | |
379 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
380 | continue; | |
381 | stab->refcnt++; | |
f3b9605d | 382 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
383 | return stab; |
384 | } | |
385 | ||
f3b9605d | 386 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
387 | |
388 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
389 | if (!stab) | |
390 | return ERR_PTR(-ENOMEM); | |
391 | ||
392 | stab->refcnt = 1; | |
393 | stab->szopts = *s; | |
394 | if (tsize > 0) | |
395 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
396 | ||
f3b9605d | 397 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 398 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 399 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
400 | |
401 | return stab; | |
402 | } | |
403 | ||
404 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
405 | { | |
406 | if (!tab) | |
407 | return; | |
408 | ||
f3b9605d | 409 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
410 | |
411 | if (--tab->refcnt == 0) { | |
412 | list_del(&tab->list); | |
413 | kfree(tab); | |
414 | } | |
415 | ||
f3b9605d | 416 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
417 | } |
418 | EXPORT_SYMBOL(qdisc_put_stab); | |
419 | ||
420 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
421 | { | |
422 | struct nlattr *nest; | |
423 | ||
424 | nest = nla_nest_start(skb, TCA_STAB); | |
425 | NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); | |
426 | nla_nest_end(skb, nest); | |
427 | ||
428 | return skb->len; | |
429 | ||
430 | nla_put_failure: | |
431 | return -1; | |
432 | } | |
433 | ||
434 | void qdisc_calculate_pkt_len(struct sk_buff *skb, struct qdisc_size_table *stab) | |
435 | { | |
436 | int pkt_len, slot; | |
437 | ||
438 | pkt_len = skb->len + stab->szopts.overhead; | |
439 | if (unlikely(!stab->szopts.tsize)) | |
440 | goto out; | |
441 | ||
442 | slot = pkt_len + stab->szopts.cell_align; | |
443 | if (unlikely(slot < 0)) | |
444 | slot = 0; | |
445 | ||
446 | slot >>= stab->szopts.cell_log; | |
447 | if (likely(slot < stab->szopts.tsize)) | |
448 | pkt_len = stab->data[slot]; | |
449 | else | |
450 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
451 | (slot / stab->szopts.tsize) + | |
452 | stab->data[slot % stab->szopts.tsize]; | |
453 | ||
454 | pkt_len <<= stab->szopts.size_log; | |
455 | out: | |
456 | if (unlikely(pkt_len < 1)) | |
457 | pkt_len = 1; | |
458 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
459 | } | |
460 | EXPORT_SYMBOL(qdisc_calculate_pkt_len); | |
461 | ||
4179477f PM |
462 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
463 | { | |
464 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
465 | timer); | |
466 | ||
467 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
11274e5a | 468 | smp_wmb(); |
8608db03 | 469 | __netif_schedule(qdisc_root(wd->qdisc)); |
1936502d | 470 | |
4179477f PM |
471 | return HRTIMER_NORESTART; |
472 | } | |
473 | ||
474 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
475 | { | |
476 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); | |
477 | wd->timer.function = qdisc_watchdog; | |
478 | wd->qdisc = qdisc; | |
479 | } | |
480 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
481 | ||
482 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
483 | { | |
484 | ktime_t time; | |
485 | ||
2540e051 JP |
486 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
487 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
488 | return; | |
489 | ||
4179477f PM |
490 | wd->qdisc->flags |= TCQ_F_THROTTLED; |
491 | time = ktime_set(0, 0); | |
492 | time = ktime_add_ns(time, PSCHED_US2NS(expires)); | |
493 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); | |
494 | } | |
495 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
496 | ||
497 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
498 | { | |
499 | hrtimer_cancel(&wd->timer); | |
500 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
501 | } | |
502 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 503 | |
a94f779f | 504 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
505 | { |
506 | unsigned int size = n * sizeof(struct hlist_head), i; | |
507 | struct hlist_head *h; | |
508 | ||
509 | if (size <= PAGE_SIZE) | |
510 | h = kmalloc(size, GFP_KERNEL); | |
511 | else | |
512 | h = (struct hlist_head *) | |
513 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
514 | ||
515 | if (h != NULL) { | |
516 | for (i = 0; i < n; i++) | |
517 | INIT_HLIST_HEAD(&h[i]); | |
518 | } | |
519 | return h; | |
520 | } | |
521 | ||
522 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
523 | { | |
524 | unsigned int size = n * sizeof(struct hlist_head); | |
525 | ||
526 | if (size <= PAGE_SIZE) | |
527 | kfree(h); | |
528 | else | |
529 | free_pages((unsigned long)h, get_order(size)); | |
530 | } | |
531 | ||
532 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
533 | { | |
534 | struct Qdisc_class_common *cl; | |
535 | struct hlist_node *n, *next; | |
536 | struct hlist_head *nhash, *ohash; | |
537 | unsigned int nsize, nmask, osize; | |
538 | unsigned int i, h; | |
539 | ||
540 | /* Rehash when load factor exceeds 0.75 */ | |
541 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
542 | return; | |
543 | nsize = clhash->hashsize * 2; | |
544 | nmask = nsize - 1; | |
545 | nhash = qdisc_class_hash_alloc(nsize); | |
546 | if (nhash == NULL) | |
547 | return; | |
548 | ||
549 | ohash = clhash->hash; | |
550 | osize = clhash->hashsize; | |
551 | ||
552 | sch_tree_lock(sch); | |
553 | for (i = 0; i < osize; i++) { | |
554 | hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) { | |
555 | h = qdisc_class_hash(cl->classid, nmask); | |
556 | hlist_add_head(&cl->hnode, &nhash[h]); | |
557 | } | |
558 | } | |
559 | clhash->hash = nhash; | |
560 | clhash->hashsize = nsize; | |
561 | clhash->hashmask = nmask; | |
562 | sch_tree_unlock(sch); | |
563 | ||
564 | qdisc_class_hash_free(ohash, osize); | |
565 | } | |
566 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
567 | ||
568 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
569 | { | |
570 | unsigned int size = 4; | |
571 | ||
572 | clhash->hash = qdisc_class_hash_alloc(size); | |
573 | if (clhash->hash == NULL) | |
574 | return -ENOMEM; | |
575 | clhash->hashsize = size; | |
576 | clhash->hashmask = size - 1; | |
577 | clhash->hashelems = 0; | |
578 | return 0; | |
579 | } | |
580 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
581 | ||
582 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
583 | { | |
584 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
585 | } | |
586 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
587 | ||
588 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
589 | struct Qdisc_class_common *cl) | |
590 | { | |
591 | unsigned int h; | |
592 | ||
593 | INIT_HLIST_NODE(&cl->hnode); | |
594 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
595 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
596 | clhash->hashelems++; | |
597 | } | |
598 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
599 | ||
600 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
601 | struct Qdisc_class_common *cl) | |
602 | { | |
603 | hlist_del(&cl->hnode); | |
604 | clhash->hashelems--; | |
605 | } | |
606 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
607 | ||
1da177e4 LT |
608 | /* Allocate an unique handle from space managed by kernel */ |
609 | ||
610 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
611 | { | |
612 | int i = 0x10000; | |
613 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
614 | ||
615 | do { | |
616 | autohandle += TC_H_MAKE(0x10000U, 0); | |
617 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
618 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
619 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
620 | ||
621 | return i>0 ? autohandle : 0; | |
622 | } | |
623 | ||
99194cff | 624 | /* Attach toplevel qdisc to device queue. */ |
1da177e4 | 625 | |
99194cff DM |
626 | static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
627 | struct Qdisc *qdisc) | |
1da177e4 | 628 | { |
8d50b53d | 629 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; |
53049978 | 630 | spinlock_t *root_lock; |
53049978 | 631 | |
666d9bbe | 632 | root_lock = qdisc_lock(oqdisc); |
53049978 DM |
633 | spin_lock_bh(root_lock); |
634 | ||
8d50b53d DM |
635 | /* Prune old scheduler */ |
636 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
637 | qdisc_reset(oqdisc); | |
1da177e4 | 638 | |
8d50b53d DM |
639 | /* ... and graft new one */ |
640 | if (qdisc == NULL) | |
641 | qdisc = &noop_qdisc; | |
642 | dev_queue->qdisc_sleeping = qdisc; | |
f7a54c13 | 643 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); |
1da177e4 | 644 | |
53049978 | 645 | spin_unlock_bh(root_lock); |
1da177e4 | 646 | |
1da177e4 LT |
647 | return oqdisc; |
648 | } | |
649 | ||
43effa1e PM |
650 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
651 | { | |
20fea08b | 652 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
653 | unsigned long cl; |
654 | u32 parentid; | |
655 | ||
656 | if (n == 0) | |
657 | return; | |
658 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
659 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
660 | return; | |
661 | ||
5ce2d488 | 662 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
663 | if (sch == NULL) { |
664 | WARN_ON(parentid != TC_H_ROOT); | |
665 | return; | |
666 | } | |
43effa1e PM |
667 | cops = sch->ops->cl_ops; |
668 | if (cops->qlen_notify) { | |
669 | cl = cops->get(sch, parentid); | |
670 | cops->qlen_notify(sch, cl); | |
671 | cops->put(sch, cl); | |
672 | } | |
673 | sch->q.qlen -= n; | |
674 | } | |
675 | } | |
676 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 677 | |
99194cff DM |
678 | static void notify_and_destroy(struct sk_buff *skb, struct nlmsghdr *n, u32 clid, |
679 | struct Qdisc *old, struct Qdisc *new) | |
680 | { | |
681 | if (new || old) | |
682 | qdisc_notify(skb, n, clid, old, new); | |
1da177e4 | 683 | |
4d8863a2 | 684 | if (old) |
99194cff | 685 | qdisc_destroy(old); |
99194cff DM |
686 | } |
687 | ||
688 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
689 | * to device "dev". | |
690 | * | |
691 | * When appropriate send a netlink notification using 'skb' | |
692 | * and "n". | |
693 | * | |
694 | * On success, destroy old qdisc. | |
1da177e4 LT |
695 | */ |
696 | ||
697 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
698 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
699 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 700 | { |
99194cff | 701 | struct Qdisc *q = old; |
1da177e4 | 702 | int err = 0; |
1da177e4 | 703 | |
10297b99 | 704 | if (parent == NULL) { |
99194cff DM |
705 | unsigned int i, num_q, ingress; |
706 | ||
707 | ingress = 0; | |
708 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
709 | if ((q && q->flags & TCQ_F_INGRESS) || |
710 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
711 | num_q = 1; |
712 | ingress = 1; | |
713 | } | |
714 | ||
715 | if (dev->flags & IFF_UP) | |
716 | dev_deactivate(dev); | |
717 | ||
718 | for (i = 0; i < num_q; i++) { | |
719 | struct netdev_queue *dev_queue = &dev->rx_queue; | |
720 | ||
721 | if (!ingress) | |
722 | dev_queue = netdev_get_tx_queue(dev, i); | |
723 | ||
8d50b53d DM |
724 | old = dev_graft_qdisc(dev_queue, new); |
725 | if (new && i > 0) | |
726 | atomic_inc(&new->refcnt); | |
727 | ||
99194cff | 728 | notify_and_destroy(skb, n, classid, old, new); |
1da177e4 | 729 | } |
99194cff DM |
730 | |
731 | if (dev->flags & IFF_UP) | |
732 | dev_activate(dev); | |
1da177e4 | 733 | } else { |
20fea08b | 734 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 LT |
735 | |
736 | err = -EINVAL; | |
737 | ||
738 | if (cops) { | |
739 | unsigned long cl = cops->get(parent, classid); | |
740 | if (cl) { | |
99194cff | 741 | err = cops->graft(parent, cl, new, &old); |
1da177e4 LT |
742 | cops->put(parent, cl); |
743 | } | |
744 | } | |
99194cff DM |
745 | if (!err) |
746 | notify_and_destroy(skb, n, classid, old, new); | |
1da177e4 LT |
747 | } |
748 | return err; | |
749 | } | |
750 | ||
25bfcd5a JP |
751 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
752 | static struct lock_class_key qdisc_tx_lock; | |
753 | static struct lock_class_key qdisc_rx_lock; | |
754 | ||
1da177e4 LT |
755 | /* |
756 | Allocate and initialize new qdisc. | |
757 | ||
758 | Parameters are passed via opt. | |
759 | */ | |
760 | ||
761 | static struct Qdisc * | |
bb949fbd DM |
762 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
763 | u32 parent, u32 handle, struct nlattr **tca, int *errp) | |
1da177e4 LT |
764 | { |
765 | int err; | |
1e90474c | 766 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
767 | struct Qdisc *sch; |
768 | struct Qdisc_ops *ops; | |
175f9c1b | 769 | struct qdisc_size_table *stab; |
1da177e4 LT |
770 | |
771 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 772 | #ifdef CONFIG_MODULES |
1da177e4 LT |
773 | if (ops == NULL && kind != NULL) { |
774 | char name[IFNAMSIZ]; | |
1e90474c | 775 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
776 | /* We dropped the RTNL semaphore in order to |
777 | * perform the module load. So, even if we | |
778 | * succeeded in loading the module we have to | |
779 | * tell the caller to replay the request. We | |
780 | * indicate this using -EAGAIN. | |
781 | * We replay the request because the device may | |
782 | * go away in the mean time. | |
783 | */ | |
784 | rtnl_unlock(); | |
785 | request_module("sch_%s", name); | |
786 | rtnl_lock(); | |
787 | ops = qdisc_lookup_ops(kind); | |
788 | if (ops != NULL) { | |
789 | /* We will try again qdisc_lookup_ops, | |
790 | * so don't keep a reference. | |
791 | */ | |
792 | module_put(ops->owner); | |
793 | err = -EAGAIN; | |
794 | goto err_out; | |
795 | } | |
796 | } | |
797 | } | |
798 | #endif | |
799 | ||
b9e2cc0f | 800 | err = -ENOENT; |
1da177e4 LT |
801 | if (ops == NULL) |
802 | goto err_out; | |
803 | ||
5ce2d488 | 804 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
805 | if (IS_ERR(sch)) { |
806 | err = PTR_ERR(sch); | |
1da177e4 | 807 | goto err_out2; |
3d54b82f | 808 | } |
1da177e4 | 809 | |
ffc8fefa PM |
810 | sch->parent = parent; |
811 | ||
3d54b82f | 812 | if (handle == TC_H_INGRESS) { |
1da177e4 | 813 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 814 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 815 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 816 | } else { |
fd44de7c PM |
817 | if (handle == 0) { |
818 | handle = qdisc_alloc_handle(dev); | |
819 | err = -ENOMEM; | |
820 | if (handle == 0) | |
821 | goto err_out3; | |
822 | } | |
25bfcd5a | 823 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1da177e4 LT |
824 | } |
825 | ||
3d54b82f | 826 | sch->handle = handle; |
1da177e4 | 827 | |
1e90474c | 828 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
829 | if (tca[TCA_STAB]) { |
830 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
831 | if (IS_ERR(stab)) { | |
832 | err = PTR_ERR(stab); | |
833 | goto err_out3; | |
834 | } | |
835 | sch->stab = stab; | |
836 | } | |
1e90474c | 837 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
838 | spinlock_t *root_lock; |
839 | ||
840 | if ((sch->parent != TC_H_ROOT) && | |
841 | !(sch->flags & TCQ_F_INGRESS)) | |
842 | root_lock = qdisc_root_sleeping_lock(sch); | |
843 | else | |
844 | root_lock = qdisc_lock(sch); | |
845 | ||
023e09a7 | 846 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f | 847 | root_lock, tca[TCA_RATE]); |
023e09a7 TG |
848 | if (err) { |
849 | /* | |
850 | * Any broken qdiscs that would require | |
851 | * a ops->reset() here? The qdisc was never | |
852 | * in action so it shouldn't be necessary. | |
853 | */ | |
854 | if (ops->destroy) | |
855 | ops->destroy(sch); | |
856 | goto err_out3; | |
857 | } | |
858 | } | |
f6e0b239 JP |
859 | |
860 | qdisc_list_add(sch); | |
1da177e4 | 861 | |
1da177e4 LT |
862 | return sch; |
863 | } | |
864 | err_out3: | |
175f9c1b | 865 | qdisc_put_stab(sch->stab); |
1da177e4 | 866 | dev_put(dev); |
3d54b82f | 867 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
868 | err_out2: |
869 | module_put(ops->owner); | |
870 | err_out: | |
871 | *errp = err; | |
1da177e4 LT |
872 | return NULL; |
873 | } | |
874 | ||
1e90474c | 875 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 876 | { |
175f9c1b JK |
877 | struct qdisc_size_table *stab = NULL; |
878 | int err = 0; | |
1da177e4 | 879 | |
175f9c1b | 880 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
881 | if (sch->ops->change == NULL) |
882 | return -EINVAL; | |
1e90474c | 883 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
884 | if (err) |
885 | return err; | |
886 | } | |
175f9c1b JK |
887 | |
888 | if (tca[TCA_STAB]) { | |
889 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
890 | if (IS_ERR(stab)) | |
891 | return PTR_ERR(stab); | |
892 | } | |
893 | ||
894 | qdisc_put_stab(sch->stab); | |
895 | sch->stab = stab; | |
896 | ||
1e90474c | 897 | if (tca[TCA_RATE]) |
1da177e4 | 898 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f JP |
899 | qdisc_root_sleeping_lock(sch), |
900 | tca[TCA_RATE]); | |
1da177e4 LT |
901 | return 0; |
902 | } | |
903 | ||
904 | struct check_loop_arg | |
905 | { | |
906 | struct qdisc_walker w; | |
907 | struct Qdisc *p; | |
908 | int depth; | |
909 | }; | |
910 | ||
911 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
912 | ||
913 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
914 | { | |
915 | struct check_loop_arg arg; | |
916 | ||
917 | if (q->ops->cl_ops == NULL) | |
918 | return 0; | |
919 | ||
920 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
921 | arg.w.fn = check_loop_fn; | |
922 | arg.depth = depth; | |
923 | arg.p = p; | |
924 | q->ops->cl_ops->walk(q, &arg.w); | |
925 | return arg.w.stop ? -ELOOP : 0; | |
926 | } | |
927 | ||
928 | static int | |
929 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
930 | { | |
931 | struct Qdisc *leaf; | |
20fea08b | 932 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
933 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
934 | ||
935 | leaf = cops->leaf(q, cl); | |
936 | if (leaf) { | |
937 | if (leaf == arg->p || arg->depth > 7) | |
938 | return -ELOOP; | |
939 | return check_loop(leaf, arg->p, arg->depth + 1); | |
940 | } | |
941 | return 0; | |
942 | } | |
943 | ||
944 | /* | |
945 | * Delete/get qdisc. | |
946 | */ | |
947 | ||
948 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
949 | { | |
3b1e0a65 | 950 | struct net *net = sock_net(skb->sk); |
1da177e4 | 951 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 952 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
953 | struct net_device *dev; |
954 | u32 clid = tcm->tcm_parent; | |
955 | struct Qdisc *q = NULL; | |
956 | struct Qdisc *p = NULL; | |
957 | int err; | |
958 | ||
b854272b DL |
959 | if (net != &init_net) |
960 | return -EINVAL; | |
961 | ||
881d966b | 962 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
963 | return -ENODEV; |
964 | ||
1e90474c PM |
965 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
966 | if (err < 0) | |
967 | return err; | |
968 | ||
1da177e4 LT |
969 | if (clid) { |
970 | if (clid != TC_H_ROOT) { | |
971 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
972 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
973 | return -ENOENT; | |
974 | q = qdisc_leaf(p, clid); | |
975 | } else { /* ingress */ | |
8123b421 | 976 | q = dev->rx_queue.qdisc_sleeping; |
10297b99 | 977 | } |
1da177e4 | 978 | } else { |
e8a0464c DM |
979 | struct netdev_queue *dev_queue; |
980 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 981 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
982 | } |
983 | if (!q) | |
984 | return -ENOENT; | |
985 | ||
986 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
987 | return -EINVAL; | |
988 | } else { | |
989 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
990 | return -ENOENT; | |
991 | } | |
992 | ||
1e90474c | 993 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
994 | return -EINVAL; |
995 | ||
996 | if (n->nlmsg_type == RTM_DELQDISC) { | |
997 | if (!clid) | |
998 | return -EINVAL; | |
999 | if (q->handle == 0) | |
1000 | return -ENOENT; | |
99194cff | 1001 | if ((err = qdisc_graft(dev, p, skb, n, clid, NULL, q)) != 0) |
1da177e4 | 1002 | return err; |
1da177e4 LT |
1003 | } else { |
1004 | qdisc_notify(skb, n, clid, NULL, q); | |
1005 | } | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | Create/change qdisc. | |
1011 | */ | |
1012 | ||
1013 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1014 | { | |
3b1e0a65 | 1015 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1016 | struct tcmsg *tcm; |
1e90474c | 1017 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1018 | struct net_device *dev; |
1019 | u32 clid; | |
1020 | struct Qdisc *q, *p; | |
1021 | int err; | |
1022 | ||
b854272b DL |
1023 | if (net != &init_net) |
1024 | return -EINVAL; | |
1025 | ||
1da177e4 LT |
1026 | replay: |
1027 | /* Reinit, just in case something touches this. */ | |
1028 | tcm = NLMSG_DATA(n); | |
1da177e4 LT |
1029 | clid = tcm->tcm_parent; |
1030 | q = p = NULL; | |
1031 | ||
881d966b | 1032 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1033 | return -ENODEV; |
1034 | ||
1e90474c PM |
1035 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1036 | if (err < 0) | |
1037 | return err; | |
1038 | ||
1da177e4 LT |
1039 | if (clid) { |
1040 | if (clid != TC_H_ROOT) { | |
1041 | if (clid != TC_H_INGRESS) { | |
1042 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
1043 | return -ENOENT; | |
1044 | q = qdisc_leaf(p, clid); | |
1045 | } else { /*ingress */ | |
8123b421 | 1046 | q = dev->rx_queue.qdisc_sleeping; |
1da177e4 LT |
1047 | } |
1048 | } else { | |
e8a0464c DM |
1049 | struct netdev_queue *dev_queue; |
1050 | dev_queue = netdev_get_tx_queue(dev, 0); | |
b0e1e646 | 1051 | q = dev_queue->qdisc_sleeping; |
1da177e4 LT |
1052 | } |
1053 | ||
1054 | /* It may be default qdisc, ignore it */ | |
1055 | if (q && q->handle == 0) | |
1056 | q = NULL; | |
1057 | ||
1058 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1059 | if (tcm->tcm_handle) { | |
1060 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
1061 | return -EEXIST; | |
1062 | if (TC_H_MIN(tcm->tcm_handle)) | |
1063 | return -EINVAL; | |
1064 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
1065 | goto create_n_graft; | |
1066 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1067 | return -EEXIST; | |
1e90474c | 1068 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1069 | return -EINVAL; |
1070 | if (q == p || | |
1071 | (p && check_loop(q, p, 0))) | |
1072 | return -ELOOP; | |
1073 | atomic_inc(&q->refcnt); | |
1074 | goto graft; | |
1075 | } else { | |
1076 | if (q == NULL) | |
1077 | goto create_n_graft; | |
1078 | ||
1079 | /* This magic test requires explanation. | |
1080 | * | |
1081 | * We know, that some child q is already | |
1082 | * attached to this parent and have choice: | |
1083 | * either to change it or to create/graft new one. | |
1084 | * | |
1085 | * 1. We are allowed to create/graft only | |
1086 | * if CREATE and REPLACE flags are set. | |
1087 | * | |
1088 | * 2. If EXCL is set, requestor wanted to say, | |
1089 | * that qdisc tcm_handle is not expected | |
1090 | * to exist, so that we choose create/graft too. | |
1091 | * | |
1092 | * 3. The last case is when no flags are set. | |
1093 | * Alas, it is sort of hole in API, we | |
1094 | * cannot decide what to do unambiguously. | |
1095 | * For now we select create/graft, if | |
1096 | * user gave KIND, which does not match existing. | |
1097 | */ | |
1098 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
1099 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
1100 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
1e90474c PM |
1101 | (tca[TCA_KIND] && |
1102 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1103 | goto create_n_graft; |
1104 | } | |
1105 | } | |
1106 | } else { | |
1107 | if (!tcm->tcm_handle) | |
1108 | return -EINVAL; | |
1109 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1110 | } | |
1111 | ||
1112 | /* Change qdisc parameters */ | |
1113 | if (q == NULL) | |
1114 | return -ENOENT; | |
1115 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1116 | return -EEXIST; | |
1e90474c | 1117 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1118 | return -EINVAL; |
1119 | err = qdisc_change(q, tca); | |
1120 | if (err == 0) | |
1121 | qdisc_notify(skb, n, clid, NULL, q); | |
1122 | return err; | |
1123 | ||
1124 | create_n_graft: | |
1125 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
1126 | return -ENOENT; | |
1127 | if (clid == TC_H_INGRESS) | |
bb949fbd DM |
1128 | q = qdisc_create(dev, &dev->rx_queue, |
1129 | tcm->tcm_parent, tcm->tcm_parent, | |
ffc8fefa | 1130 | tca, &err); |
10297b99 | 1131 | else |
e8a0464c | 1132 | q = qdisc_create(dev, netdev_get_tx_queue(dev, 0), |
bb949fbd | 1133 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1134 | tca, &err); |
1da177e4 LT |
1135 | if (q == NULL) { |
1136 | if (err == -EAGAIN) | |
1137 | goto replay; | |
1138 | return err; | |
1139 | } | |
1140 | ||
1141 | graft: | |
e5befbd9 IJ |
1142 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1143 | if (err) { | |
1144 | if (q) | |
1145 | qdisc_destroy(q); | |
1146 | return err; | |
1da177e4 | 1147 | } |
e5befbd9 | 1148 | |
1da177e4 LT |
1149 | return 0; |
1150 | } | |
1151 | ||
1152 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 1153 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1154 | { |
1155 | struct tcmsg *tcm; | |
1156 | struct nlmsghdr *nlh; | |
27a884dc | 1157 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1158 | struct gnet_dump d; |
1159 | ||
e431b8c0 | 1160 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1161 | tcm = NLMSG_DATA(nlh); |
1162 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1163 | tcm->tcm__pad1 = 0; |
1164 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1165 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1166 | tcm->tcm_parent = clid; |
1167 | tcm->tcm_handle = q->handle; | |
1168 | tcm->tcm_info = atomic_read(&q->refcnt); | |
57e1c487 | 1169 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1170 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1171 | goto nla_put_failure; |
1da177e4 LT |
1172 | q->qstats.qlen = q->q.qlen; |
1173 | ||
175f9c1b JK |
1174 | if (q->stab && qdisc_dump_stab(skb, q->stab) < 0) |
1175 | goto nla_put_failure; | |
1176 | ||
102396ae JP |
1177 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1178 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1179 | goto nla_put_failure; |
1da177e4 LT |
1180 | |
1181 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1182 | goto nla_put_failure; |
1da177e4 LT |
1183 | |
1184 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
1da177e4 | 1185 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
1da177e4 | 1186 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1187 | goto nla_put_failure; |
10297b99 | 1188 | |
1da177e4 | 1189 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1190 | goto nla_put_failure; |
10297b99 | 1191 | |
27a884dc | 1192 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1193 | return skb->len; |
1194 | ||
1195 | nlmsg_failure: | |
1e90474c | 1196 | nla_put_failure: |
dc5fc579 | 1197 | nlmsg_trim(skb, b); |
1da177e4 LT |
1198 | return -1; |
1199 | } | |
1200 | ||
1201 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1202 | u32 clid, struct Qdisc *old, struct Qdisc *new) | |
1203 | { | |
1204 | struct sk_buff *skb; | |
1205 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1206 | ||
1207 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1208 | if (!skb) | |
1209 | return -ENOBUFS; | |
1210 | ||
1211 | if (old && old->handle) { | |
1212 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) | |
1213 | goto err_out; | |
1214 | } | |
1215 | if (new) { | |
1216 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) | |
1217 | goto err_out; | |
1218 | } | |
1219 | ||
1220 | if (skb->len) | |
97c53cac | 1221 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1222 | |
1223 | err_out: | |
1224 | kfree_skb(skb); | |
1225 | return -EINVAL; | |
1226 | } | |
1227 | ||
30723673 DM |
1228 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1229 | { | |
1230 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1231 | } | |
1232 | ||
1233 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, | |
1234 | struct netlink_callback *cb, | |
1235 | int *q_idx_p, int s_q_idx) | |
1236 | { | |
1237 | int ret = 0, q_idx = *q_idx_p; | |
1238 | struct Qdisc *q; | |
1239 | ||
1240 | if (!root) | |
1241 | return 0; | |
1242 | ||
1243 | q = root; | |
1244 | if (q_idx < s_q_idx) { | |
1245 | q_idx++; | |
1246 | } else { | |
1247 | if (!tc_qdisc_dump_ignore(q) && | |
1248 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1249 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1250 | goto done; | |
1251 | q_idx++; | |
1252 | } | |
1253 | list_for_each_entry(q, &root->list, list) { | |
1254 | if (q_idx < s_q_idx) { | |
1255 | q_idx++; | |
1256 | continue; | |
1257 | } | |
1258 | if (!tc_qdisc_dump_ignore(q) && | |
1259 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1260 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1261 | goto done; | |
1262 | q_idx++; | |
1263 | } | |
1264 | ||
1265 | out: | |
1266 | *q_idx_p = q_idx; | |
1267 | return ret; | |
1268 | done: | |
1269 | ret = -1; | |
1270 | goto out; | |
1271 | } | |
1272 | ||
1da177e4 LT |
1273 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1274 | { | |
3b1e0a65 | 1275 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1276 | int idx, q_idx; |
1277 | int s_idx, s_q_idx; | |
1278 | struct net_device *dev; | |
1da177e4 | 1279 | |
b854272b DL |
1280 | if (net != &init_net) |
1281 | return 0; | |
1282 | ||
1da177e4 LT |
1283 | s_idx = cb->args[0]; |
1284 | s_q_idx = q_idx = cb->args[1]; | |
1285 | read_lock(&dev_base_lock); | |
7562f876 | 1286 | idx = 0; |
881d966b | 1287 | for_each_netdev(&init_net, dev) { |
30723673 DM |
1288 | struct netdev_queue *dev_queue; |
1289 | ||
1da177e4 | 1290 | if (idx < s_idx) |
7562f876 | 1291 | goto cont; |
1da177e4 LT |
1292 | if (idx > s_idx) |
1293 | s_q_idx = 0; | |
1da177e4 | 1294 | q_idx = 0; |
30723673 DM |
1295 | |
1296 | dev_queue = netdev_get_tx_queue(dev, 0); | |
827ebd64 | 1297 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1298 | goto done; |
1299 | ||
1300 | dev_queue = &dev->rx_queue; | |
827ebd64 | 1301 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1302 | goto done; |
1303 | ||
7562f876 PE |
1304 | cont: |
1305 | idx++; | |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | done: | |
1309 | read_unlock(&dev_base_lock); | |
1310 | ||
1311 | cb->args[0] = idx; | |
1312 | cb->args[1] = q_idx; | |
1313 | ||
1314 | return skb->len; | |
1315 | } | |
1316 | ||
1317 | ||
1318 | ||
1319 | /************************************************ | |
1320 | * Traffic classes manipulation. * | |
1321 | ************************************************/ | |
1322 | ||
1323 | ||
1324 | ||
1325 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1326 | { | |
3b1e0a65 | 1327 | struct net *net = sock_net(skb->sk); |
b0e1e646 | 1328 | struct netdev_queue *dev_queue; |
1da177e4 | 1329 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 1330 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1331 | struct net_device *dev; |
1332 | struct Qdisc *q = NULL; | |
20fea08b | 1333 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1334 | unsigned long cl = 0; |
1335 | unsigned long new_cl; | |
1336 | u32 pid = tcm->tcm_parent; | |
1337 | u32 clid = tcm->tcm_handle; | |
1338 | u32 qid = TC_H_MAJ(clid); | |
1339 | int err; | |
1340 | ||
b854272b DL |
1341 | if (net != &init_net) |
1342 | return -EINVAL; | |
1343 | ||
881d966b | 1344 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1345 | return -ENODEV; |
1346 | ||
1e90474c PM |
1347 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1348 | if (err < 0) | |
1349 | return err; | |
1350 | ||
1da177e4 LT |
1351 | /* |
1352 | parent == TC_H_UNSPEC - unspecified parent. | |
1353 | parent == TC_H_ROOT - class is root, which has no parent. | |
1354 | parent == X:0 - parent is root class. | |
1355 | parent == X:Y - parent is a node in hierarchy. | |
1356 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1357 | ||
1358 | handle == 0:0 - generate handle from kernel pool. | |
1359 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1360 | handle == X:Y - clear. | |
1361 | handle == X:0 - root class. | |
1362 | */ | |
1363 | ||
1364 | /* Step 1. Determine qdisc handle X:0 */ | |
1365 | ||
e8a0464c | 1366 | dev_queue = netdev_get_tx_queue(dev, 0); |
1da177e4 LT |
1367 | if (pid != TC_H_ROOT) { |
1368 | u32 qid1 = TC_H_MAJ(pid); | |
1369 | ||
1370 | if (qid && qid1) { | |
1371 | /* If both majors are known, they must be identical. */ | |
1372 | if (qid != qid1) | |
1373 | return -EINVAL; | |
1374 | } else if (qid1) { | |
1375 | qid = qid1; | |
1376 | } else if (qid == 0) | |
b0e1e646 | 1377 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1378 | |
1379 | /* Now qid is genuine qdisc handle consistent | |
1380 | both with parent and child. | |
1381 | ||
1382 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
1383 | */ | |
1384 | if (pid) | |
1385 | pid = TC_H_MAKE(qid, pid); | |
1386 | } else { | |
1387 | if (qid == 0) | |
b0e1e646 | 1388 | qid = dev_queue->qdisc_sleeping->handle; |
1da177e4 LT |
1389 | } |
1390 | ||
1391 | /* OK. Locate qdisc */ | |
10297b99 | 1392 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
1da177e4 LT |
1393 | return -ENOENT; |
1394 | ||
1395 | /* An check that it supports classes */ | |
1396 | cops = q->ops->cl_ops; | |
1397 | if (cops == NULL) | |
1398 | return -EINVAL; | |
1399 | ||
1400 | /* Now try to get class */ | |
1401 | if (clid == 0) { | |
1402 | if (pid == TC_H_ROOT) | |
1403 | clid = qid; | |
1404 | } else | |
1405 | clid = TC_H_MAKE(qid, clid); | |
1406 | ||
1407 | if (clid) | |
1408 | cl = cops->get(q, clid); | |
1409 | ||
1410 | if (cl == 0) { | |
1411 | err = -ENOENT; | |
1412 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
1413 | goto out; | |
1414 | } else { | |
1415 | switch (n->nlmsg_type) { | |
10297b99 | 1416 | case RTM_NEWTCLASS: |
1da177e4 LT |
1417 | err = -EEXIST; |
1418 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1419 | goto out; | |
1420 | break; | |
1421 | case RTM_DELTCLASS: | |
1422 | err = cops->delete(q, cl); | |
1423 | if (err == 0) | |
1424 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); | |
1425 | goto out; | |
1426 | case RTM_GETTCLASS: | |
1427 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); | |
1428 | goto out; | |
1429 | default: | |
1430 | err = -EINVAL; | |
1431 | goto out; | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | new_cl = cl; | |
1436 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1437 | if (err == 0) | |
1438 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); | |
1439 | ||
1440 | out: | |
1441 | if (cl) | |
1442 | cops->put(q, cl); | |
1443 | ||
1444 | return err; | |
1445 | } | |
1446 | ||
1447 | ||
1448 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1449 | unsigned long cl, | |
e431b8c0 | 1450 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1451 | { |
1452 | struct tcmsg *tcm; | |
1453 | struct nlmsghdr *nlh; | |
27a884dc | 1454 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1455 | struct gnet_dump d; |
20fea08b | 1456 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1457 | |
e431b8c0 | 1458 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1459 | tcm = NLMSG_DATA(nlh); |
1460 | tcm->tcm_family = AF_UNSPEC; | |
5ce2d488 | 1461 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1462 | tcm->tcm_parent = q->handle; |
1463 | tcm->tcm_handle = q->handle; | |
1464 | tcm->tcm_info = 0; | |
57e1c487 | 1465 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1466 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1467 | goto nla_put_failure; |
1da177e4 | 1468 | |
102396ae JP |
1469 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1470 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1471 | goto nla_put_failure; |
1da177e4 LT |
1472 | |
1473 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1474 | goto nla_put_failure; |
1da177e4 LT |
1475 | |
1476 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1477 | goto nla_put_failure; |
1da177e4 | 1478 | |
27a884dc | 1479 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1480 | return skb->len; |
1481 | ||
1482 | nlmsg_failure: | |
1e90474c | 1483 | nla_put_failure: |
dc5fc579 | 1484 | nlmsg_trim(skb, b); |
1da177e4 LT |
1485 | return -1; |
1486 | } | |
1487 | ||
1488 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, | |
1489 | struct Qdisc *q, unsigned long cl, int event) | |
1490 | { | |
1491 | struct sk_buff *skb; | |
1492 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1493 | ||
1494 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1495 | if (!skb) | |
1496 | return -ENOBUFS; | |
1497 | ||
1498 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1499 | kfree_skb(skb); | |
1500 | return -EINVAL; | |
1501 | } | |
1502 | ||
97c53cac | 1503 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1504 | } |
1505 | ||
1506 | struct qdisc_dump_args | |
1507 | { | |
1508 | struct qdisc_walker w; | |
1509 | struct sk_buff *skb; | |
1510 | struct netlink_callback *cb; | |
1511 | }; | |
1512 | ||
1513 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1514 | { | |
1515 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1516 | ||
1517 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1518 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1519 | } | |
1520 | ||
30723673 DM |
1521 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1522 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1523 | int *t_p, int s_t) | |
1524 | { | |
1525 | struct qdisc_dump_args arg; | |
1526 | ||
1527 | if (tc_qdisc_dump_ignore(q) || | |
1528 | *t_p < s_t || !q->ops->cl_ops || | |
1529 | (tcm->tcm_parent && | |
1530 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1531 | (*t_p)++; | |
1532 | return 0; | |
1533 | } | |
1534 | if (*t_p > s_t) | |
1535 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1536 | arg.w.fn = qdisc_class_dump; | |
1537 | arg.skb = skb; | |
1538 | arg.cb = cb; | |
1539 | arg.w.stop = 0; | |
1540 | arg.w.skip = cb->args[1]; | |
1541 | arg.w.count = 0; | |
1542 | q->ops->cl_ops->walk(q, &arg.w); | |
1543 | cb->args[1] = arg.w.count; | |
1544 | if (arg.w.stop) | |
1545 | return -1; | |
1546 | (*t_p)++; | |
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1551 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1552 | int *t_p, int s_t) | |
1553 | { | |
1554 | struct Qdisc *q; | |
1555 | ||
1556 | if (!root) | |
1557 | return 0; | |
1558 | ||
1559 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1560 | return -1; | |
1561 | ||
1562 | list_for_each_entry(q, &root->list, list) { | |
1563 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1564 | return -1; | |
1565 | } | |
1566 | ||
1567 | return 0; | |
1568 | } | |
1569 | ||
1da177e4 LT |
1570 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1571 | { | |
30723673 | 1572 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
3b1e0a65 | 1573 | struct net *net = sock_net(skb->sk); |
30723673 | 1574 | struct netdev_queue *dev_queue; |
1da177e4 | 1575 | struct net_device *dev; |
30723673 | 1576 | int t, s_t; |
1da177e4 | 1577 | |
b854272b DL |
1578 | if (net != &init_net) |
1579 | return 0; | |
1580 | ||
1da177e4 LT |
1581 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
1582 | return 0; | |
881d966b | 1583 | if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1584 | return 0; |
1585 | ||
1586 | s_t = cb->args[0]; | |
1587 | t = 0; | |
1588 | ||
30723673 | 1589 | dev_queue = netdev_get_tx_queue(dev, 0); |
8123b421 | 1590 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1591 | goto done; |
1592 | ||
1593 | dev_queue = &dev->rx_queue; | |
8123b421 | 1594 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 | 1595 | goto done; |
1da177e4 | 1596 | |
30723673 | 1597 | done: |
1da177e4 LT |
1598 | cb->args[0] = t; |
1599 | ||
1600 | dev_put(dev); | |
1601 | return skb->len; | |
1602 | } | |
1603 | ||
1604 | /* Main classifier routine: scans classifier chain attached | |
1605 | to this qdisc, (optionally) tests for protocol and asks | |
1606 | specific classifiers. | |
1607 | */ | |
73ca4918 PM |
1608 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1609 | struct tcf_result *res) | |
1610 | { | |
1611 | __be16 protocol = skb->protocol; | |
1612 | int err = 0; | |
1613 | ||
1614 | for (; tp; tp = tp->next) { | |
1615 | if ((tp->protocol == protocol || | |
1616 | tp->protocol == htons(ETH_P_ALL)) && | |
1617 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1618 | #ifdef CONFIG_NET_CLS_ACT | |
1619 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1620 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1621 | #endif | |
1622 | return err; | |
1623 | } | |
1624 | } | |
1625 | return -1; | |
1626 | } | |
1627 | EXPORT_SYMBOL(tc_classify_compat); | |
1628 | ||
1da177e4 | 1629 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1630 | struct tcf_result *res) |
1da177e4 LT |
1631 | { |
1632 | int err = 0; | |
73ca4918 | 1633 | __be16 protocol; |
1da177e4 LT |
1634 | #ifdef CONFIG_NET_CLS_ACT |
1635 | struct tcf_proto *otp = tp; | |
1636 | reclassify: | |
1637 | #endif | |
1638 | protocol = skb->protocol; | |
1639 | ||
73ca4918 | 1640 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1641 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1642 | if (err == TC_ACT_RECLASSIFY) { |
1643 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1644 | tp = otp; | |
1645 | ||
1646 | if (verd++ >= MAX_REC_LOOP) { | |
1647 | printk("rule prio %u protocol %02x reclassify loop, " | |
1648 | "packet dropped\n", | |
1649 | tp->prio&0xffff, ntohs(tp->protocol)); | |
1650 | return TC_ACT_SHOT; | |
1da177e4 | 1651 | } |
73ca4918 PM |
1652 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1653 | goto reclassify; | |
1da177e4 | 1654 | } |
73ca4918 PM |
1655 | #endif |
1656 | return err; | |
1da177e4 | 1657 | } |
73ca4918 | 1658 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1659 | |
a48b5a61 PM |
1660 | void tcf_destroy(struct tcf_proto *tp) |
1661 | { | |
1662 | tp->ops->destroy(tp); | |
1663 | module_put(tp->ops->owner); | |
1664 | kfree(tp); | |
1665 | } | |
1666 | ||
ff31ab56 | 1667 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1668 | { |
1669 | struct tcf_proto *tp; | |
1670 | ||
ff31ab56 PM |
1671 | while ((tp = *fl) != NULL) { |
1672 | *fl = tp->next; | |
a48b5a61 PM |
1673 | tcf_destroy(tp); |
1674 | } | |
1675 | } | |
1676 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1677 | ||
1da177e4 LT |
1678 | #ifdef CONFIG_PROC_FS |
1679 | static int psched_show(struct seq_file *seq, void *v) | |
1680 | { | |
3c0cfc13 PM |
1681 | struct timespec ts; |
1682 | ||
1683 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1684 | seq_printf(seq, "%08x %08x %08x %08x\n", |
641b9e0e | 1685 | (u32)NSEC_PER_USEC, (u32)PSCHED_US2NS(1), |
514bca32 | 1686 | 1000000, |
3c0cfc13 | 1687 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1688 | |
1689 | return 0; | |
1690 | } | |
1691 | ||
1692 | static int psched_open(struct inode *inode, struct file *file) | |
1693 | { | |
1694 | return single_open(file, psched_show, PDE(inode)->data); | |
1695 | } | |
1696 | ||
da7071d7 | 1697 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1698 | .owner = THIS_MODULE, |
1699 | .open = psched_open, | |
1700 | .read = seq_read, | |
1701 | .llseek = seq_lseek, | |
1702 | .release = single_release, | |
10297b99 | 1703 | }; |
1da177e4 LT |
1704 | #endif |
1705 | ||
1da177e4 LT |
1706 | static int __init pktsched_init(void) |
1707 | { | |
1da177e4 LT |
1708 | register_qdisc(&pfifo_qdisc_ops); |
1709 | register_qdisc(&bfifo_qdisc_ops); | |
457c4cbc | 1710 | proc_net_fops_create(&init_net, "psched", 0, &psched_fops); |
1da177e4 | 1711 | |
be577ddc TG |
1712 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
1713 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); | |
1714 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); | |
1715 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); | |
1716 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); | |
1717 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); | |
1718 | ||
1da177e4 LT |
1719 | return 0; |
1720 | } | |
1721 | ||
1722 | subsys_initcall(pktsched_init); |