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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> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
1da177e4 | 32 | |
457c4cbc | 33 | #include <net/net_namespace.h> |
b854272b | 34 | #include <net/sock.h> |
dc5fc579 | 35 | #include <net/netlink.h> |
1da177e4 LT |
36 | #include <net/pkt_sched.h> |
37 | ||
7316ae88 TG |
38 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
39 | struct nlmsghdr *n, u32 clid, | |
1da177e4 | 40 | struct Qdisc *old, struct Qdisc *new); |
7316ae88 TG |
41 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
42 | struct nlmsghdr *n, struct Qdisc *q, | |
43 | unsigned long cl, int event); | |
1da177e4 LT |
44 | |
45 | /* | |
46 | ||
47 | Short review. | |
48 | ------------- | |
49 | ||
50 | This file consists of two interrelated parts: | |
51 | ||
52 | 1. queueing disciplines manager frontend. | |
53 | 2. traffic classes manager frontend. | |
54 | ||
55 | Generally, queueing discipline ("qdisc") is a black box, | |
56 | which is able to enqueue packets and to dequeue them (when | |
57 | device is ready to send something) in order and at times | |
58 | determined by algorithm hidden in it. | |
59 | ||
60 | qdisc's are divided to two categories: | |
61 | - "queues", which have no internal structure visible from outside. | |
62 | - "schedulers", which split all the packets to "traffic classes", | |
63 | using "packet classifiers" (look at cls_api.c) | |
64 | ||
65 | In turn, classes may have child qdiscs (as rule, queues) | |
66 | attached to them etc. etc. etc. | |
67 | ||
68 | The goal of the routines in this file is to translate | |
69 | information supplied by user in the form of handles | |
70 | to more intelligible for kernel form, to make some sanity | |
71 | checks and part of work, which is common to all qdiscs | |
72 | and to provide rtnetlink notifications. | |
73 | ||
74 | All real intelligent work is done inside qdisc modules. | |
75 | ||
76 | ||
77 | ||
78 | Every discipline has two major routines: enqueue and dequeue. | |
79 | ||
80 | ---dequeue | |
81 | ||
82 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
83 | but it does not mean that queue is empty, it just means that | |
84 | discipline does not want to send anything this time. | |
85 | Queue is really empty if q->q.qlen == 0. | |
86 | For complicated disciplines with multiple queues q->q is not | |
87 | real packet queue, but however q->q.qlen must be valid. | |
88 | ||
89 | ---enqueue | |
90 | ||
91 | enqueue returns 0, if packet was enqueued successfully. | |
92 | If packet (this one or another one) was dropped, it returns | |
93 | not zero error code. | |
94 | NET_XMIT_DROP - this packet dropped | |
95 | Expected action: do not backoff, but wait until queue will clear. | |
96 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
97 | Expected action: backoff or ignore | |
98 | NET_XMIT_POLICED - dropped by police. | |
99 | Expected action: backoff or error to real-time apps. | |
100 | ||
101 | Auxiliary routines: | |
102 | ||
99c0db26 JP |
103 | ---peek |
104 | ||
105 | like dequeue but without removing a packet from the queue | |
106 | ||
1da177e4 LT |
107 | ---reset |
108 | ||
109 | returns qdisc to initial state: purge all buffers, clear all | |
110 | timers, counters (except for statistics) etc. | |
111 | ||
112 | ---init | |
113 | ||
114 | initializes newly created qdisc. | |
115 | ||
116 | ---destroy | |
117 | ||
118 | destroys resources allocated by init and during lifetime of qdisc. | |
119 | ||
120 | ---change | |
121 | ||
122 | changes qdisc parameters. | |
123 | */ | |
124 | ||
125 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
126 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
127 | ||
128 | ||
129 | /************************************************ | |
130 | * Queueing disciplines manipulation. * | |
131 | ************************************************/ | |
132 | ||
133 | ||
134 | /* The list of all installed queueing disciplines. */ | |
135 | ||
136 | static struct Qdisc_ops *qdisc_base; | |
137 | ||
138 | /* Register/uregister queueing discipline */ | |
139 | ||
140 | int register_qdisc(struct Qdisc_ops *qops) | |
141 | { | |
142 | struct Qdisc_ops *q, **qp; | |
143 | int rc = -EEXIST; | |
144 | ||
145 | write_lock(&qdisc_mod_lock); | |
146 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
147 | if (!strcmp(qops->id, q->id)) | |
148 | goto out; | |
149 | ||
150 | if (qops->enqueue == NULL) | |
151 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 JP |
152 | if (qops->peek == NULL) { |
153 | if (qops->dequeue == NULL) { | |
154 | qops->peek = noop_qdisc_ops.peek; | |
155 | } else { | |
156 | rc = -EINVAL; | |
157 | goto out; | |
158 | } | |
159 | } | |
1da177e4 LT |
160 | if (qops->dequeue == NULL) |
161 | qops->dequeue = noop_qdisc_ops.dequeue; | |
162 | ||
163 | qops->next = NULL; | |
164 | *qp = qops; | |
165 | rc = 0; | |
166 | out: | |
167 | write_unlock(&qdisc_mod_lock); | |
168 | return rc; | |
169 | } | |
62e3ba1b | 170 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
171 | |
172 | int unregister_qdisc(struct Qdisc_ops *qops) | |
173 | { | |
174 | struct Qdisc_ops *q, **qp; | |
175 | int err = -ENOENT; | |
176 | ||
177 | write_lock(&qdisc_mod_lock); | |
178 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) | |
179 | if (q == qops) | |
180 | break; | |
181 | if (q) { | |
182 | *qp = q->next; | |
183 | q->next = NULL; | |
184 | err = 0; | |
185 | } | |
186 | write_unlock(&qdisc_mod_lock); | |
187 | return err; | |
188 | } | |
62e3ba1b | 189 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 LT |
190 | |
191 | /* We know handle. Find qdisc among all qdisc's attached to device | |
192 | (root qdisc, all its children, children of children etc.) | |
193 | */ | |
194 | ||
6113b748 | 195 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
196 | { |
197 | struct Qdisc *q; | |
198 | ||
199 | if (!(root->flags & TCQ_F_BUILTIN) && | |
200 | root->handle == handle) | |
201 | return root; | |
202 | ||
203 | list_for_each_entry(q, &root->list, list) { | |
204 | if (q->handle == handle) | |
205 | return q; | |
206 | } | |
207 | return NULL; | |
208 | } | |
209 | ||
f6e0b239 JP |
210 | static void qdisc_list_add(struct Qdisc *q) |
211 | { | |
f6486d40 | 212 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
af356afa | 213 | list_add_tail(&q->list, &qdisc_dev(q)->qdisc->list); |
f6e0b239 JP |
214 | } |
215 | ||
216 | void qdisc_list_del(struct Qdisc *q) | |
217 | { | |
f6486d40 | 218 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
f6e0b239 | 219 | list_del(&q->list); |
f6e0b239 JP |
220 | } |
221 | EXPORT_SYMBOL(qdisc_list_del); | |
222 | ||
ead81cc5 | 223 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 224 | { |
f6e0b239 JP |
225 | struct Qdisc *q; |
226 | ||
af356afa PM |
227 | q = qdisc_match_from_root(dev->qdisc, handle); |
228 | if (q) | |
229 | goto out; | |
f6e0b239 JP |
230 | |
231 | q = qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle); | |
f6486d40 | 232 | out: |
f6e0b239 | 233 | return q; |
1da177e4 LT |
234 | } |
235 | ||
236 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
237 | { | |
238 | unsigned long cl; | |
239 | struct Qdisc *leaf; | |
20fea08b | 240 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
241 | |
242 | if (cops == NULL) | |
243 | return NULL; | |
244 | cl = cops->get(p, classid); | |
245 | ||
246 | if (cl == 0) | |
247 | return NULL; | |
248 | leaf = cops->leaf(p, cl); | |
249 | cops->put(p, cl); | |
250 | return leaf; | |
251 | } | |
252 | ||
253 | /* Find queueing discipline by name */ | |
254 | ||
1e90474c | 255 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
256 | { |
257 | struct Qdisc_ops *q = NULL; | |
258 | ||
259 | if (kind) { | |
260 | read_lock(&qdisc_mod_lock); | |
261 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 262 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
263 | if (!try_module_get(q->owner)) |
264 | q = NULL; | |
265 | break; | |
266 | } | |
267 | } | |
268 | read_unlock(&qdisc_mod_lock); | |
269 | } | |
270 | return q; | |
271 | } | |
272 | ||
273 | static struct qdisc_rate_table *qdisc_rtab_list; | |
274 | ||
1e90474c | 275 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
276 | { |
277 | struct qdisc_rate_table *rtab; | |
278 | ||
279 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { | |
280 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { | |
281 | rtab->refcnt++; | |
282 | return rtab; | |
283 | } | |
284 | } | |
285 | ||
5feb5e1a PM |
286 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
287 | nla_len(tab) != TC_RTAB_SIZE) | |
1da177e4 LT |
288 | return NULL; |
289 | ||
290 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); | |
291 | if (rtab) { | |
292 | rtab->rate = *r; | |
293 | rtab->refcnt = 1; | |
1e90474c | 294 | memcpy(rtab->data, nla_data(tab), 1024); |
1da177e4 LT |
295 | rtab->next = qdisc_rtab_list; |
296 | qdisc_rtab_list = rtab; | |
297 | } | |
298 | return rtab; | |
299 | } | |
62e3ba1b | 300 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
301 | |
302 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
303 | { | |
304 | struct qdisc_rate_table *rtab, **rtabp; | |
305 | ||
306 | if (!tab || --tab->refcnt) | |
307 | return; | |
308 | ||
309 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { | |
310 | if (rtab == tab) { | |
311 | *rtabp = rtab->next; | |
312 | kfree(rtab); | |
313 | return; | |
314 | } | |
315 | } | |
316 | } | |
62e3ba1b | 317 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 318 | |
175f9c1b JK |
319 | static LIST_HEAD(qdisc_stab_list); |
320 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
321 | ||
322 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
323 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
324 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
325 | }; | |
326 | ||
327 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
328 | { | |
329 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
330 | struct qdisc_size_table *stab; | |
331 | struct tc_sizespec *s; | |
332 | unsigned int tsize = 0; | |
333 | u16 *tab = NULL; | |
334 | int err; | |
335 | ||
336 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
337 | if (err < 0) | |
338 | return ERR_PTR(err); | |
339 | if (!tb[TCA_STAB_BASE]) | |
340 | return ERR_PTR(-EINVAL); | |
341 | ||
342 | s = nla_data(tb[TCA_STAB_BASE]); | |
343 | ||
344 | if (s->tsize > 0) { | |
345 | if (!tb[TCA_STAB_DATA]) | |
346 | return ERR_PTR(-EINVAL); | |
347 | tab = nla_data(tb[TCA_STAB_DATA]); | |
348 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
349 | } | |
350 | ||
351 | if (!s || tsize != s->tsize || (!tab && tsize > 0)) | |
352 | return ERR_PTR(-EINVAL); | |
353 | ||
f3b9605d | 354 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
355 | |
356 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
357 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
358 | continue; | |
359 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
360 | continue; | |
361 | stab->refcnt++; | |
f3b9605d | 362 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
363 | return stab; |
364 | } | |
365 | ||
f3b9605d | 366 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
367 | |
368 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
369 | if (!stab) | |
370 | return ERR_PTR(-ENOMEM); | |
371 | ||
372 | stab->refcnt = 1; | |
373 | stab->szopts = *s; | |
374 | if (tsize > 0) | |
375 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
376 | ||
f3b9605d | 377 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 378 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 379 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
380 | |
381 | return stab; | |
382 | } | |
383 | ||
384 | void qdisc_put_stab(struct qdisc_size_table *tab) | |
385 | { | |
386 | if (!tab) | |
387 | return; | |
388 | ||
f3b9605d | 389 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
390 | |
391 | if (--tab->refcnt == 0) { | |
392 | list_del(&tab->list); | |
393 | kfree(tab); | |
394 | } | |
395 | ||
f3b9605d | 396 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
397 | } |
398 | EXPORT_SYMBOL(qdisc_put_stab); | |
399 | ||
400 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
401 | { | |
402 | struct nlattr *nest; | |
403 | ||
404 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
405 | if (nest == NULL) |
406 | goto nla_put_failure; | |
175f9c1b JK |
407 | NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); |
408 | nla_nest_end(skb, nest); | |
409 | ||
410 | return skb->len; | |
411 | ||
412 | nla_put_failure: | |
413 | return -1; | |
414 | } | |
415 | ||
416 | void qdisc_calculate_pkt_len(struct sk_buff *skb, struct qdisc_size_table *stab) | |
417 | { | |
418 | int pkt_len, slot; | |
419 | ||
420 | pkt_len = skb->len + stab->szopts.overhead; | |
421 | if (unlikely(!stab->szopts.tsize)) | |
422 | goto out; | |
423 | ||
424 | slot = pkt_len + stab->szopts.cell_align; | |
425 | if (unlikely(slot < 0)) | |
426 | slot = 0; | |
427 | ||
428 | slot >>= stab->szopts.cell_log; | |
429 | if (likely(slot < stab->szopts.tsize)) | |
430 | pkt_len = stab->data[slot]; | |
431 | else | |
432 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
433 | (slot / stab->szopts.tsize) + | |
434 | stab->data[slot % stab->szopts.tsize]; | |
435 | ||
436 | pkt_len <<= stab->szopts.size_log; | |
437 | out: | |
438 | if (unlikely(pkt_len < 1)) | |
439 | pkt_len = 1; | |
440 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
441 | } | |
442 | EXPORT_SYMBOL(qdisc_calculate_pkt_len); | |
443 | ||
b00355db JP |
444 | void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc) |
445 | { | |
446 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
447 | printk(KERN_WARNING | |
448 | "%s: %s qdisc %X: is non-work-conserving?\n", | |
449 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
450 | qdisc->flags |= TCQ_F_WARN_NONWC; | |
451 | } | |
452 | } | |
453 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
454 | ||
4179477f PM |
455 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
456 | { | |
457 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 458 | timer); |
4179477f PM |
459 | |
460 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; | |
8608db03 | 461 | __netif_schedule(qdisc_root(wd->qdisc)); |
1936502d | 462 | |
4179477f PM |
463 | return HRTIMER_NORESTART; |
464 | } | |
465 | ||
466 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
467 | { | |
2fbd3da3 DM |
468 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
469 | wd->timer.function = qdisc_watchdog; | |
4179477f PM |
470 | wd->qdisc = qdisc; |
471 | } | |
472 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
473 | ||
474 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) | |
475 | { | |
476 | ktime_t time; | |
477 | ||
2540e051 JP |
478 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
479 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
480 | return; | |
481 | ||
4179477f PM |
482 | wd->qdisc->flags |= TCQ_F_THROTTLED; |
483 | time = ktime_set(0, 0); | |
ca44d6e6 | 484 | time = ktime_add_ns(time, PSCHED_TICKS2NS(expires)); |
2fbd3da3 | 485 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); |
4179477f PM |
486 | } |
487 | EXPORT_SYMBOL(qdisc_watchdog_schedule); | |
488 | ||
489 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
490 | { | |
2fbd3da3 | 491 | hrtimer_cancel(&wd->timer); |
4179477f PM |
492 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; |
493 | } | |
494 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 495 | |
a94f779f | 496 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
497 | { |
498 | unsigned int size = n * sizeof(struct hlist_head), i; | |
499 | struct hlist_head *h; | |
500 | ||
501 | if (size <= PAGE_SIZE) | |
502 | h = kmalloc(size, GFP_KERNEL); | |
503 | else | |
504 | h = (struct hlist_head *) | |
505 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
506 | ||
507 | if (h != NULL) { | |
508 | for (i = 0; i < n; i++) | |
509 | INIT_HLIST_HEAD(&h[i]); | |
510 | } | |
511 | return h; | |
512 | } | |
513 | ||
514 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
515 | { | |
516 | unsigned int size = n * sizeof(struct hlist_head); | |
517 | ||
518 | if (size <= PAGE_SIZE) | |
519 | kfree(h); | |
520 | else | |
521 | free_pages((unsigned long)h, get_order(size)); | |
522 | } | |
523 | ||
524 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
525 | { | |
526 | struct Qdisc_class_common *cl; | |
527 | struct hlist_node *n, *next; | |
528 | struct hlist_head *nhash, *ohash; | |
529 | unsigned int nsize, nmask, osize; | |
530 | unsigned int i, h; | |
531 | ||
532 | /* Rehash when load factor exceeds 0.75 */ | |
533 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
534 | return; | |
535 | nsize = clhash->hashsize * 2; | |
536 | nmask = nsize - 1; | |
537 | nhash = qdisc_class_hash_alloc(nsize); | |
538 | if (nhash == NULL) | |
539 | return; | |
540 | ||
541 | ohash = clhash->hash; | |
542 | osize = clhash->hashsize; | |
543 | ||
544 | sch_tree_lock(sch); | |
545 | for (i = 0; i < osize; i++) { | |
546 | hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) { | |
547 | h = qdisc_class_hash(cl->classid, nmask); | |
548 | hlist_add_head(&cl->hnode, &nhash[h]); | |
549 | } | |
550 | } | |
551 | clhash->hash = nhash; | |
552 | clhash->hashsize = nsize; | |
553 | clhash->hashmask = nmask; | |
554 | sch_tree_unlock(sch); | |
555 | ||
556 | qdisc_class_hash_free(ohash, osize); | |
557 | } | |
558 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
559 | ||
560 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
561 | { | |
562 | unsigned int size = 4; | |
563 | ||
564 | clhash->hash = qdisc_class_hash_alloc(size); | |
565 | if (clhash->hash == NULL) | |
566 | return -ENOMEM; | |
567 | clhash->hashsize = size; | |
568 | clhash->hashmask = size - 1; | |
569 | clhash->hashelems = 0; | |
570 | return 0; | |
571 | } | |
572 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
573 | ||
574 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
575 | { | |
576 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
577 | } | |
578 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
579 | ||
580 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
581 | struct Qdisc_class_common *cl) | |
582 | { | |
583 | unsigned int h; | |
584 | ||
585 | INIT_HLIST_NODE(&cl->hnode); | |
586 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
587 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
588 | clhash->hashelems++; | |
589 | } | |
590 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
591 | ||
592 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
593 | struct Qdisc_class_common *cl) | |
594 | { | |
595 | hlist_del(&cl->hnode); | |
596 | clhash->hashelems--; | |
597 | } | |
598 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
599 | ||
1da177e4 LT |
600 | /* Allocate an unique handle from space managed by kernel */ |
601 | ||
602 | static u32 qdisc_alloc_handle(struct net_device *dev) | |
603 | { | |
604 | int i = 0x10000; | |
605 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); | |
606 | ||
607 | do { | |
608 | autohandle += TC_H_MAKE(0x10000U, 0); | |
609 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
610 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
611 | } while (qdisc_lookup(dev, autohandle) && --i > 0); | |
612 | ||
613 | return i>0 ? autohandle : 0; | |
614 | } | |
615 | ||
43effa1e PM |
616 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
617 | { | |
20fea08b | 618 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
619 | unsigned long cl; |
620 | u32 parentid; | |
621 | ||
622 | if (n == 0) | |
623 | return; | |
624 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
625 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
626 | return; | |
627 | ||
5ce2d488 | 628 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
629 | if (sch == NULL) { |
630 | WARN_ON(parentid != TC_H_ROOT); | |
631 | return; | |
632 | } | |
43effa1e PM |
633 | cops = sch->ops->cl_ops; |
634 | if (cops->qlen_notify) { | |
635 | cl = cops->get(sch, parentid); | |
636 | cops->qlen_notify(sch, cl); | |
637 | cops->put(sch, cl); | |
638 | } | |
639 | sch->q.qlen -= n; | |
640 | } | |
641 | } | |
642 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 643 | |
7316ae88 TG |
644 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
645 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
646 | struct Qdisc *old, struct Qdisc *new) |
647 | { | |
648 | if (new || old) | |
7316ae88 | 649 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 650 | |
4d8863a2 | 651 | if (old) |
99194cff | 652 | qdisc_destroy(old); |
99194cff DM |
653 | } |
654 | ||
655 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
656 | * to device "dev". | |
657 | * | |
658 | * When appropriate send a netlink notification using 'skb' | |
659 | * and "n". | |
660 | * | |
661 | * On success, destroy old qdisc. | |
1da177e4 LT |
662 | */ |
663 | ||
664 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
665 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
666 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 667 | { |
99194cff | 668 | struct Qdisc *q = old; |
7316ae88 | 669 | struct net *net = dev_net(dev); |
1da177e4 | 670 | int err = 0; |
1da177e4 | 671 | |
10297b99 | 672 | if (parent == NULL) { |
99194cff DM |
673 | unsigned int i, num_q, ingress; |
674 | ||
675 | ingress = 0; | |
676 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
677 | if ((q && q->flags & TCQ_F_INGRESS) || |
678 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
679 | num_q = 1; |
680 | ingress = 1; | |
681 | } | |
682 | ||
683 | if (dev->flags & IFF_UP) | |
684 | dev_deactivate(dev); | |
685 | ||
6ec1c69a DM |
686 | if (new && new->ops->attach) { |
687 | new->ops->attach(new); | |
688 | num_q = 0; | |
689 | } | |
690 | ||
99194cff DM |
691 | for (i = 0; i < num_q; i++) { |
692 | struct netdev_queue *dev_queue = &dev->rx_queue; | |
693 | ||
694 | if (!ingress) | |
695 | dev_queue = netdev_get_tx_queue(dev, i); | |
696 | ||
8d50b53d DM |
697 | old = dev_graft_qdisc(dev_queue, new); |
698 | if (new && i > 0) | |
699 | atomic_inc(&new->refcnt); | |
700 | ||
036d6a67 JP |
701 | if (!ingress) |
702 | qdisc_destroy(old); | |
1da177e4 | 703 | } |
99194cff | 704 | |
036d6a67 | 705 | if (!ingress) { |
7316ae88 TG |
706 | notify_and_destroy(net, skb, n, classid, |
707 | dev->qdisc, new); | |
036d6a67 JP |
708 | if (new && !new->ops->attach) |
709 | atomic_inc(&new->refcnt); | |
710 | dev->qdisc = new ? : &noop_qdisc; | |
711 | } else { | |
7316ae88 | 712 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 713 | } |
af356afa | 714 | |
99194cff DM |
715 | if (dev->flags & IFF_UP) |
716 | dev_activate(dev); | |
1da177e4 | 717 | } else { |
20fea08b | 718 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 719 | |
c9f1d038 PM |
720 | err = -EOPNOTSUPP; |
721 | if (cops && cops->graft) { | |
1da177e4 LT |
722 | unsigned long cl = cops->get(parent, classid); |
723 | if (cl) { | |
99194cff | 724 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 725 | cops->put(parent, cl); |
c9f1d038 PM |
726 | } else |
727 | err = -ENOENT; | |
1da177e4 | 728 | } |
99194cff | 729 | if (!err) |
7316ae88 | 730 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
731 | } |
732 | return err; | |
733 | } | |
734 | ||
25bfcd5a JP |
735 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
736 | static struct lock_class_key qdisc_tx_lock; | |
737 | static struct lock_class_key qdisc_rx_lock; | |
738 | ||
1da177e4 LT |
739 | /* |
740 | Allocate and initialize new qdisc. | |
741 | ||
742 | Parameters are passed via opt. | |
743 | */ | |
744 | ||
745 | static struct Qdisc * | |
bb949fbd | 746 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
23bcf634 PM |
747 | struct Qdisc *p, u32 parent, u32 handle, |
748 | 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); | |
7c64b9f3 | 818 | goto err_out4; |
175f9c1b JK |
819 | } |
820 | sch->stab = stab; | |
821 | } | |
1e90474c | 822 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
823 | spinlock_t *root_lock; |
824 | ||
23bcf634 PM |
825 | err = -EOPNOTSUPP; |
826 | if (sch->flags & TCQ_F_MQROOT) | |
827 | goto err_out4; | |
828 | ||
f6f9b93f | 829 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
830 | !(sch->flags & TCQ_F_INGRESS) && |
831 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
f6f9b93f JP |
832 | root_lock = qdisc_root_sleeping_lock(sch); |
833 | else | |
834 | root_lock = qdisc_lock(sch); | |
835 | ||
023e09a7 | 836 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f | 837 | root_lock, tca[TCA_RATE]); |
23bcf634 PM |
838 | if (err) |
839 | goto err_out4; | |
023e09a7 | 840 | } |
f6e0b239 JP |
841 | |
842 | qdisc_list_add(sch); | |
1da177e4 | 843 | |
1da177e4 LT |
844 | return sch; |
845 | } | |
846 | err_out3: | |
847 | dev_put(dev); | |
3d54b82f | 848 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
849 | err_out2: |
850 | module_put(ops->owner); | |
851 | err_out: | |
852 | *errp = err; | |
1da177e4 | 853 | return NULL; |
23bcf634 PM |
854 | |
855 | err_out4: | |
856 | /* | |
857 | * Any broken qdiscs that would require a ops->reset() here? | |
858 | * The qdisc was never in action so it shouldn't be necessary. | |
859 | */ | |
7c64b9f3 | 860 | qdisc_put_stab(sch->stab); |
23bcf634 PM |
861 | if (ops->destroy) |
862 | ops->destroy(sch); | |
863 | goto err_out3; | |
1da177e4 LT |
864 | } |
865 | ||
1e90474c | 866 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 867 | { |
175f9c1b JK |
868 | struct qdisc_size_table *stab = NULL; |
869 | int err = 0; | |
1da177e4 | 870 | |
175f9c1b | 871 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
872 | if (sch->ops->change == NULL) |
873 | return -EINVAL; | |
1e90474c | 874 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
875 | if (err) |
876 | return err; | |
877 | } | |
175f9c1b JK |
878 | |
879 | if (tca[TCA_STAB]) { | |
880 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
881 | if (IS_ERR(stab)) | |
882 | return PTR_ERR(stab); | |
883 | } | |
884 | ||
885 | qdisc_put_stab(sch->stab); | |
886 | sch->stab = stab; | |
887 | ||
23bcf634 | 888 | if (tca[TCA_RATE]) { |
71bcb09a SH |
889 | /* NB: ignores errors from replace_estimator |
890 | because change can't be undone. */ | |
23bcf634 PM |
891 | if (sch->flags & TCQ_F_MQROOT) |
892 | goto out; | |
1da177e4 | 893 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
71bcb09a SH |
894 | qdisc_root_sleeping_lock(sch), |
895 | tca[TCA_RATE]); | |
23bcf634 PM |
896 | } |
897 | out: | |
1da177e4 LT |
898 | return 0; |
899 | } | |
900 | ||
901 | struct check_loop_arg | |
902 | { | |
903 | struct qdisc_walker w; | |
904 | struct Qdisc *p; | |
905 | int depth; | |
906 | }; | |
907 | ||
908 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
909 | ||
910 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
911 | { | |
912 | struct check_loop_arg arg; | |
913 | ||
914 | if (q->ops->cl_ops == NULL) | |
915 | return 0; | |
916 | ||
917 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
918 | arg.w.fn = check_loop_fn; | |
919 | arg.depth = depth; | |
920 | arg.p = p; | |
921 | q->ops->cl_ops->walk(q, &arg.w); | |
922 | return arg.w.stop ? -ELOOP : 0; | |
923 | } | |
924 | ||
925 | static int | |
926 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
927 | { | |
928 | struct Qdisc *leaf; | |
20fea08b | 929 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
930 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
931 | ||
932 | leaf = cops->leaf(q, cl); | |
933 | if (leaf) { | |
934 | if (leaf == arg->p || arg->depth > 7) | |
935 | return -ELOOP; | |
936 | return check_loop(leaf, arg->p, arg->depth + 1); | |
937 | } | |
938 | return 0; | |
939 | } | |
940 | ||
941 | /* | |
942 | * Delete/get qdisc. | |
943 | */ | |
944 | ||
945 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
946 | { | |
3b1e0a65 | 947 | struct net *net = sock_net(skb->sk); |
1da177e4 | 948 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 949 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
950 | struct net_device *dev; |
951 | u32 clid = tcm->tcm_parent; | |
952 | struct Qdisc *q = NULL; | |
953 | struct Qdisc *p = NULL; | |
954 | int err; | |
955 | ||
7316ae88 | 956 | if ((dev = __dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
957 | return -ENODEV; |
958 | ||
1e90474c PM |
959 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
960 | if (err < 0) | |
961 | return err; | |
962 | ||
1da177e4 LT |
963 | if (clid) { |
964 | if (clid != TC_H_ROOT) { | |
965 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
966 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
967 | return -ENOENT; | |
968 | q = qdisc_leaf(p, clid); | |
969 | } else { /* ingress */ | |
8123b421 | 970 | q = dev->rx_queue.qdisc_sleeping; |
10297b99 | 971 | } |
1da177e4 | 972 | } else { |
af356afa | 973 | q = dev->qdisc; |
1da177e4 LT |
974 | } |
975 | if (!q) | |
976 | return -ENOENT; | |
977 | ||
978 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
979 | return -EINVAL; | |
980 | } else { | |
981 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
982 | return -ENOENT; | |
983 | } | |
984 | ||
1e90474c | 985 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
986 | return -EINVAL; |
987 | ||
988 | if (n->nlmsg_type == RTM_DELQDISC) { | |
989 | if (!clid) | |
990 | return -EINVAL; | |
991 | if (q->handle == 0) | |
992 | return -ENOENT; | |
99194cff | 993 | if ((err = qdisc_graft(dev, p, skb, n, clid, NULL, q)) != 0) |
1da177e4 | 994 | return err; |
1da177e4 | 995 | } else { |
7316ae88 | 996 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
997 | } |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | Create/change qdisc. | |
1003 | */ | |
1004 | ||
1005 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1006 | { | |
3b1e0a65 | 1007 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1008 | struct tcmsg *tcm; |
1e90474c | 1009 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1010 | struct net_device *dev; |
1011 | u32 clid; | |
1012 | struct Qdisc *q, *p; | |
1013 | int err; | |
1014 | ||
1015 | replay: | |
1016 | /* Reinit, just in case something touches this. */ | |
1017 | tcm = NLMSG_DATA(n); | |
1da177e4 LT |
1018 | clid = tcm->tcm_parent; |
1019 | q = p = NULL; | |
1020 | ||
7316ae88 | 1021 | if ((dev = __dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1022 | return -ENODEV; |
1023 | ||
1e90474c PM |
1024 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1025 | if (err < 0) | |
1026 | return err; | |
1027 | ||
1da177e4 LT |
1028 | if (clid) { |
1029 | if (clid != TC_H_ROOT) { | |
1030 | if (clid != TC_H_INGRESS) { | |
1031 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) | |
1032 | return -ENOENT; | |
1033 | q = qdisc_leaf(p, clid); | |
1034 | } else { /*ingress */ | |
8123b421 | 1035 | q = dev->rx_queue.qdisc_sleeping; |
1da177e4 LT |
1036 | } |
1037 | } else { | |
af356afa | 1038 | q = dev->qdisc; |
1da177e4 LT |
1039 | } |
1040 | ||
1041 | /* It may be default qdisc, ignore it */ | |
1042 | if (q && q->handle == 0) | |
1043 | q = NULL; | |
1044 | ||
1045 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1046 | if (tcm->tcm_handle) { | |
1047 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) | |
1048 | return -EEXIST; | |
1049 | if (TC_H_MIN(tcm->tcm_handle)) | |
1050 | return -EINVAL; | |
1051 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) | |
1052 | goto create_n_graft; | |
1053 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1054 | return -EEXIST; | |
1e90474c | 1055 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1056 | return -EINVAL; |
1057 | if (q == p || | |
1058 | (p && check_loop(q, p, 0))) | |
1059 | return -ELOOP; | |
1060 | atomic_inc(&q->refcnt); | |
1061 | goto graft; | |
1062 | } else { | |
1063 | if (q == NULL) | |
1064 | goto create_n_graft; | |
1065 | ||
1066 | /* This magic test requires explanation. | |
1067 | * | |
1068 | * We know, that some child q is already | |
1069 | * attached to this parent and have choice: | |
1070 | * either to change it or to create/graft new one. | |
1071 | * | |
1072 | * 1. We are allowed to create/graft only | |
1073 | * if CREATE and REPLACE flags are set. | |
1074 | * | |
1075 | * 2. If EXCL is set, requestor wanted to say, | |
1076 | * that qdisc tcm_handle is not expected | |
1077 | * to exist, so that we choose create/graft too. | |
1078 | * | |
1079 | * 3. The last case is when no flags are set. | |
1080 | * Alas, it is sort of hole in API, we | |
1081 | * cannot decide what to do unambiguously. | |
1082 | * For now we select create/graft, if | |
1083 | * user gave KIND, which does not match existing. | |
1084 | */ | |
1085 | if ((n->nlmsg_flags&NLM_F_CREATE) && | |
1086 | (n->nlmsg_flags&NLM_F_REPLACE) && | |
1087 | ((n->nlmsg_flags&NLM_F_EXCL) || | |
1e90474c PM |
1088 | (tca[TCA_KIND] && |
1089 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1090 | goto create_n_graft; |
1091 | } | |
1092 | } | |
1093 | } else { | |
1094 | if (!tcm->tcm_handle) | |
1095 | return -EINVAL; | |
1096 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1097 | } | |
1098 | ||
1099 | /* Change qdisc parameters */ | |
1100 | if (q == NULL) | |
1101 | return -ENOENT; | |
1102 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1103 | return -EEXIST; | |
1e90474c | 1104 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1105 | return -EINVAL; |
1106 | err = qdisc_change(q, tca); | |
1107 | if (err == 0) | |
7316ae88 | 1108 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1109 | return err; |
1110 | ||
1111 | create_n_graft: | |
1112 | if (!(n->nlmsg_flags&NLM_F_CREATE)) | |
1113 | return -ENOENT; | |
1114 | if (clid == TC_H_INGRESS) | |
23bcf634 | 1115 | q = qdisc_create(dev, &dev->rx_queue, p, |
bb949fbd | 1116 | tcm->tcm_parent, tcm->tcm_parent, |
ffc8fefa | 1117 | tca, &err); |
6ec1c69a | 1118 | else { |
926e61b7 | 1119 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1120 | |
1121 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1122 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1123 | else if (p) | |
1124 | dev_queue = p->dev_queue; | |
1125 | else | |
1126 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1127 | |
926e61b7 | 1128 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1129 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1130 | tca, &err); |
6ec1c69a | 1131 | } |
1da177e4 LT |
1132 | if (q == NULL) { |
1133 | if (err == -EAGAIN) | |
1134 | goto replay; | |
1135 | return err; | |
1136 | } | |
1137 | ||
1138 | graft: | |
e5befbd9 IJ |
1139 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1140 | if (err) { | |
1141 | if (q) | |
1142 | qdisc_destroy(q); | |
1143 | return err; | |
1da177e4 | 1144 | } |
e5befbd9 | 1145 | |
1da177e4 LT |
1146 | return 0; |
1147 | } | |
1148 | ||
1149 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
e431b8c0 | 1150 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1151 | { |
1152 | struct tcmsg *tcm; | |
1153 | struct nlmsghdr *nlh; | |
27a884dc | 1154 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1155 | struct gnet_dump d; |
1156 | ||
e431b8c0 | 1157 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1158 | tcm = NLMSG_DATA(nlh); |
1159 | tcm->tcm_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1160 | tcm->tcm__pad1 = 0; |
1161 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1162 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1163 | tcm->tcm_parent = clid; |
1164 | tcm->tcm_handle = q->handle; | |
1165 | tcm->tcm_info = atomic_read(&q->refcnt); | |
57e1c487 | 1166 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1167 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1168 | goto nla_put_failure; |
1da177e4 LT |
1169 | q->qstats.qlen = q->q.qlen; |
1170 | ||
175f9c1b JK |
1171 | if (q->stab && qdisc_dump_stab(skb, q->stab) < 0) |
1172 | goto nla_put_failure; | |
1173 | ||
102396ae JP |
1174 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1175 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1176 | goto nla_put_failure; |
1da177e4 LT |
1177 | |
1178 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1179 | goto nla_put_failure; |
1da177e4 LT |
1180 | |
1181 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
d250a5f9 | 1182 | gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || |
1da177e4 | 1183 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1184 | goto nla_put_failure; |
10297b99 | 1185 | |
1da177e4 | 1186 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1187 | goto nla_put_failure; |
10297b99 | 1188 | |
27a884dc | 1189 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1190 | return skb->len; |
1191 | ||
1192 | nlmsg_failure: | |
1e90474c | 1193 | nla_put_failure: |
dc5fc579 | 1194 | nlmsg_trim(skb, b); |
1da177e4 LT |
1195 | return -1; |
1196 | } | |
1197 | ||
53b0f080 ED |
1198 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1199 | { | |
1200 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1201 | } | |
1202 | ||
7316ae88 TG |
1203 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1204 | struct nlmsghdr *n, u32 clid, | |
1205 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1206 | { |
1207 | struct sk_buff *skb; | |
1208 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1209 | ||
1210 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1211 | if (!skb) | |
1212 | return -ENOBUFS; | |
1213 | ||
53b0f080 | 1214 | if (old && !tc_qdisc_dump_ignore(old)) { |
1da177e4 LT |
1215 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) |
1216 | goto err_out; | |
1217 | } | |
53b0f080 | 1218 | if (new && !tc_qdisc_dump_ignore(new)) { |
1da177e4 LT |
1219 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
1220 | goto err_out; | |
1221 | } | |
1222 | ||
1223 | if (skb->len) | |
7316ae88 | 1224 | return rtnetlink_send(skb, net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1225 | |
1226 | err_out: | |
1227 | kfree_skb(skb); | |
1228 | return -EINVAL; | |
1229 | } | |
1230 | ||
30723673 DM |
1231 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1232 | struct netlink_callback *cb, | |
1233 | int *q_idx_p, int s_q_idx) | |
1234 | { | |
1235 | int ret = 0, q_idx = *q_idx_p; | |
1236 | struct Qdisc *q; | |
1237 | ||
1238 | if (!root) | |
1239 | return 0; | |
1240 | ||
1241 | q = root; | |
1242 | if (q_idx < s_q_idx) { | |
1243 | q_idx++; | |
1244 | } else { | |
1245 | if (!tc_qdisc_dump_ignore(q) && | |
1246 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1247 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1248 | goto done; | |
1249 | q_idx++; | |
1250 | } | |
1251 | list_for_each_entry(q, &root->list, list) { | |
1252 | if (q_idx < s_q_idx) { | |
1253 | q_idx++; | |
1254 | continue; | |
1255 | } | |
1256 | if (!tc_qdisc_dump_ignore(q) && | |
1257 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, | |
1258 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) | |
1259 | goto done; | |
1260 | q_idx++; | |
1261 | } | |
1262 | ||
1263 | out: | |
1264 | *q_idx_p = q_idx; | |
1265 | return ret; | |
1266 | done: | |
1267 | ret = -1; | |
1268 | goto out; | |
1269 | } | |
1270 | ||
1da177e4 LT |
1271 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1272 | { | |
3b1e0a65 | 1273 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1274 | int idx, q_idx; |
1275 | int s_idx, s_q_idx; | |
1276 | struct net_device *dev; | |
1da177e4 LT |
1277 | |
1278 | s_idx = cb->args[0]; | |
1279 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1280 | |
1281 | rcu_read_lock(); | |
7562f876 | 1282 | idx = 0; |
7316ae88 | 1283 | for_each_netdev_rcu(net, dev) { |
30723673 DM |
1284 | struct netdev_queue *dev_queue; |
1285 | ||
1da177e4 | 1286 | if (idx < s_idx) |
7562f876 | 1287 | goto cont; |
1da177e4 LT |
1288 | if (idx > s_idx) |
1289 | s_q_idx = 0; | |
1da177e4 | 1290 | q_idx = 0; |
30723673 | 1291 | |
af356afa | 1292 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1293 | goto done; |
1294 | ||
1295 | dev_queue = &dev->rx_queue; | |
827ebd64 | 1296 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1297 | goto done; |
1298 | ||
7562f876 PE |
1299 | cont: |
1300 | idx++; | |
1da177e4 LT |
1301 | } |
1302 | ||
1303 | done: | |
f1e9016d | 1304 | rcu_read_unlock(); |
1da177e4 LT |
1305 | |
1306 | cb->args[0] = idx; | |
1307 | cb->args[1] = q_idx; | |
1308 | ||
1309 | return skb->len; | |
1310 | } | |
1311 | ||
1312 | ||
1313 | ||
1314 | /************************************************ | |
1315 | * Traffic classes manipulation. * | |
1316 | ************************************************/ | |
1317 | ||
1318 | ||
1319 | ||
1320 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
1321 | { | |
3b1e0a65 | 1322 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1323 | struct tcmsg *tcm = NLMSG_DATA(n); |
1e90474c | 1324 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1325 | struct net_device *dev; |
1326 | struct Qdisc *q = NULL; | |
20fea08b | 1327 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1328 | unsigned long cl = 0; |
1329 | unsigned long new_cl; | |
1330 | u32 pid = tcm->tcm_parent; | |
1331 | u32 clid = tcm->tcm_handle; | |
1332 | u32 qid = TC_H_MAJ(clid); | |
1333 | int err; | |
1334 | ||
7316ae88 | 1335 | if ((dev = __dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1336 | return -ENODEV; |
1337 | ||
1e90474c PM |
1338 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1339 | if (err < 0) | |
1340 | return err; | |
1341 | ||
1da177e4 LT |
1342 | /* |
1343 | parent == TC_H_UNSPEC - unspecified parent. | |
1344 | parent == TC_H_ROOT - class is root, which has no parent. | |
1345 | parent == X:0 - parent is root class. | |
1346 | parent == X:Y - parent is a node in hierarchy. | |
1347 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1348 | ||
1349 | handle == 0:0 - generate handle from kernel pool. | |
1350 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1351 | handle == X:Y - clear. | |
1352 | handle == X:0 - root class. | |
1353 | */ | |
1354 | ||
1355 | /* Step 1. Determine qdisc handle X:0 */ | |
1356 | ||
1357 | if (pid != TC_H_ROOT) { | |
1358 | u32 qid1 = TC_H_MAJ(pid); | |
1359 | ||
1360 | if (qid && qid1) { | |
1361 | /* If both majors are known, they must be identical. */ | |
1362 | if (qid != qid1) | |
1363 | return -EINVAL; | |
1364 | } else if (qid1) { | |
1365 | qid = qid1; | |
1366 | } else if (qid == 0) | |
af356afa | 1367 | qid = dev->qdisc->handle; |
1da177e4 LT |
1368 | |
1369 | /* Now qid is genuine qdisc handle consistent | |
1370 | both with parent and child. | |
1371 | ||
1372 | TC_H_MAJ(pid) still may be unspecified, complete it now. | |
1373 | */ | |
1374 | if (pid) | |
1375 | pid = TC_H_MAKE(qid, pid); | |
1376 | } else { | |
1377 | if (qid == 0) | |
af356afa | 1378 | qid = dev->qdisc->handle; |
1da177e4 LT |
1379 | } |
1380 | ||
1381 | /* OK. Locate qdisc */ | |
10297b99 | 1382 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
1da177e4 LT |
1383 | return -ENOENT; |
1384 | ||
1385 | /* An check that it supports classes */ | |
1386 | cops = q->ops->cl_ops; | |
1387 | if (cops == NULL) | |
1388 | return -EINVAL; | |
1389 | ||
1390 | /* Now try to get class */ | |
1391 | if (clid == 0) { | |
1392 | if (pid == TC_H_ROOT) | |
1393 | clid = qid; | |
1394 | } else | |
1395 | clid = TC_H_MAKE(qid, clid); | |
1396 | ||
1397 | if (clid) | |
1398 | cl = cops->get(q, clid); | |
1399 | ||
1400 | if (cl == 0) { | |
1401 | err = -ENOENT; | |
1402 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) | |
1403 | goto out; | |
1404 | } else { | |
1405 | switch (n->nlmsg_type) { | |
10297b99 | 1406 | case RTM_NEWTCLASS: |
1da177e4 LT |
1407 | err = -EEXIST; |
1408 | if (n->nlmsg_flags&NLM_F_EXCL) | |
1409 | goto out; | |
1410 | break; | |
1411 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1412 | err = -EOPNOTSUPP; |
1413 | if (cops->delete) | |
1414 | err = cops->delete(q, cl); | |
1da177e4 | 1415 | if (err == 0) |
7316ae88 | 1416 | tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); |
1da177e4 LT |
1417 | goto out; |
1418 | case RTM_GETTCLASS: | |
7316ae88 | 1419 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1420 | goto out; |
1421 | default: | |
1422 | err = -EINVAL; | |
1423 | goto out; | |
1424 | } | |
1425 | } | |
1426 | ||
1427 | new_cl = cl; | |
de6d5cdf PM |
1428 | err = -EOPNOTSUPP; |
1429 | if (cops->change) | |
1430 | err = cops->change(q, clid, pid, tca, &new_cl); | |
1da177e4 | 1431 | if (err == 0) |
7316ae88 | 1432 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1433 | |
1434 | out: | |
1435 | if (cl) | |
1436 | cops->put(q, cl); | |
1437 | ||
1438 | return err; | |
1439 | } | |
1440 | ||
1441 | ||
1442 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1443 | unsigned long cl, | |
e431b8c0 | 1444 | u32 pid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1445 | { |
1446 | struct tcmsg *tcm; | |
1447 | struct nlmsghdr *nlh; | |
27a884dc | 1448 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1449 | struct gnet_dump d; |
20fea08b | 1450 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1451 | |
e431b8c0 | 1452 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
1da177e4 LT |
1453 | tcm = NLMSG_DATA(nlh); |
1454 | tcm->tcm_family = AF_UNSPEC; | |
16ebb5e0 ED |
1455 | tcm->tcm__pad1 = 0; |
1456 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1457 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1458 | tcm->tcm_parent = q->handle; |
1459 | tcm->tcm_handle = q->handle; | |
1460 | tcm->tcm_info = 0; | |
57e1c487 | 1461 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
1da177e4 | 1462 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1463 | goto nla_put_failure; |
1da177e4 | 1464 | |
102396ae JP |
1465 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1466 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1467 | goto nla_put_failure; |
1da177e4 LT |
1468 | |
1469 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1470 | goto nla_put_failure; |
1da177e4 LT |
1471 | |
1472 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1473 | goto nla_put_failure; |
1da177e4 | 1474 | |
27a884dc | 1475 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1476 | return skb->len; |
1477 | ||
1478 | nlmsg_failure: | |
1e90474c | 1479 | nla_put_failure: |
dc5fc579 | 1480 | nlmsg_trim(skb, b); |
1da177e4 LT |
1481 | return -1; |
1482 | } | |
1483 | ||
7316ae88 TG |
1484 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1485 | struct nlmsghdr *n, struct Qdisc *q, | |
1486 | unsigned long cl, int event) | |
1da177e4 LT |
1487 | { |
1488 | struct sk_buff *skb; | |
1489 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; | |
1490 | ||
1491 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1492 | if (!skb) | |
1493 | return -ENOBUFS; | |
1494 | ||
1495 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { | |
1496 | kfree_skb(skb); | |
1497 | return -EINVAL; | |
1498 | } | |
1499 | ||
7316ae88 | 1500 | return rtnetlink_send(skb, net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
1501 | } |
1502 | ||
1503 | struct qdisc_dump_args | |
1504 | { | |
1505 | struct qdisc_walker w; | |
1506 | struct sk_buff *skb; | |
1507 | struct netlink_callback *cb; | |
1508 | }; | |
1509 | ||
1510 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1511 | { | |
1512 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1513 | ||
1514 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, | |
1515 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); | |
1516 | } | |
1517 | ||
30723673 DM |
1518 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1519 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1520 | int *t_p, int s_t) | |
1521 | { | |
1522 | struct qdisc_dump_args arg; | |
1523 | ||
1524 | if (tc_qdisc_dump_ignore(q) || | |
1525 | *t_p < s_t || !q->ops->cl_ops || | |
1526 | (tcm->tcm_parent && | |
1527 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1528 | (*t_p)++; | |
1529 | return 0; | |
1530 | } | |
1531 | if (*t_p > s_t) | |
1532 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1533 | arg.w.fn = qdisc_class_dump; | |
1534 | arg.skb = skb; | |
1535 | arg.cb = cb; | |
1536 | arg.w.stop = 0; | |
1537 | arg.w.skip = cb->args[1]; | |
1538 | arg.w.count = 0; | |
1539 | q->ops->cl_ops->walk(q, &arg.w); | |
1540 | cb->args[1] = arg.w.count; | |
1541 | if (arg.w.stop) | |
1542 | return -1; | |
1543 | (*t_p)++; | |
1544 | return 0; | |
1545 | } | |
1546 | ||
1547 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1548 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1549 | int *t_p, int s_t) | |
1550 | { | |
1551 | struct Qdisc *q; | |
1552 | ||
1553 | if (!root) | |
1554 | return 0; | |
1555 | ||
1556 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1557 | return -1; | |
1558 | ||
1559 | list_for_each_entry(q, &root->list, list) { | |
1560 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1561 | return -1; | |
1562 | } | |
1563 | ||
1564 | return 0; | |
1565 | } | |
1566 | ||
1da177e4 LT |
1567 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1568 | { | |
30723673 | 1569 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
3b1e0a65 | 1570 | struct net *net = sock_net(skb->sk); |
30723673 | 1571 | struct netdev_queue *dev_queue; |
1da177e4 | 1572 | struct net_device *dev; |
30723673 | 1573 | int t, s_t; |
1da177e4 LT |
1574 | |
1575 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) | |
1576 | return 0; | |
7316ae88 | 1577 | if ((dev = dev_get_by_index(net, tcm->tcm_ifindex)) == NULL) |
1da177e4 LT |
1578 | return 0; |
1579 | ||
1580 | s_t = cb->args[0]; | |
1581 | t = 0; | |
1582 | ||
af356afa | 1583 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1584 | goto done; |
1585 | ||
1586 | dev_queue = &dev->rx_queue; | |
8123b421 | 1587 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
30723673 | 1588 | goto done; |
1da177e4 | 1589 | |
30723673 | 1590 | done: |
1da177e4 LT |
1591 | cb->args[0] = t; |
1592 | ||
1593 | dev_put(dev); | |
1594 | return skb->len; | |
1595 | } | |
1596 | ||
1597 | /* Main classifier routine: scans classifier chain attached | |
1598 | to this qdisc, (optionally) tests for protocol and asks | |
1599 | specific classifiers. | |
1600 | */ | |
73ca4918 PM |
1601 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
1602 | struct tcf_result *res) | |
1603 | { | |
1604 | __be16 protocol = skb->protocol; | |
1605 | int err = 0; | |
1606 | ||
1607 | for (; tp; tp = tp->next) { | |
1608 | if ((tp->protocol == protocol || | |
1609 | tp->protocol == htons(ETH_P_ALL)) && | |
1610 | (err = tp->classify(skb, tp, res)) >= 0) { | |
1611 | #ifdef CONFIG_NET_CLS_ACT | |
1612 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1613 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1614 | #endif | |
1615 | return err; | |
1616 | } | |
1617 | } | |
1618 | return -1; | |
1619 | } | |
1620 | EXPORT_SYMBOL(tc_classify_compat); | |
1621 | ||
1da177e4 | 1622 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
73ca4918 | 1623 | struct tcf_result *res) |
1da177e4 LT |
1624 | { |
1625 | int err = 0; | |
73ca4918 | 1626 | __be16 protocol; |
1da177e4 LT |
1627 | #ifdef CONFIG_NET_CLS_ACT |
1628 | struct tcf_proto *otp = tp; | |
1629 | reclassify: | |
1630 | #endif | |
1631 | protocol = skb->protocol; | |
1632 | ||
73ca4918 | 1633 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1634 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1635 | if (err == TC_ACT_RECLASSIFY) { |
1636 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1637 | tp = otp; | |
1638 | ||
1639 | if (verd++ >= MAX_REC_LOOP) { | |
b60b6592 | 1640 | if (net_ratelimit()) |
1641 | printk(KERN_NOTICE | |
1642 | "%s: packet reclassify loop" | |
1643 | " rule prio %u protocol %02x\n", | |
1644 | tp->q->ops->id, | |
1645 | tp->prio & 0xffff, ntohs(tp->protocol)); | |
73ca4918 | 1646 | return TC_ACT_SHOT; |
1da177e4 | 1647 | } |
73ca4918 PM |
1648 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1649 | goto reclassify; | |
1da177e4 | 1650 | } |
73ca4918 PM |
1651 | #endif |
1652 | return err; | |
1da177e4 | 1653 | } |
73ca4918 | 1654 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1655 | |
a48b5a61 PM |
1656 | void tcf_destroy(struct tcf_proto *tp) |
1657 | { | |
1658 | tp->ops->destroy(tp); | |
1659 | module_put(tp->ops->owner); | |
1660 | kfree(tp); | |
1661 | } | |
1662 | ||
ff31ab56 | 1663 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1664 | { |
1665 | struct tcf_proto *tp; | |
1666 | ||
ff31ab56 PM |
1667 | while ((tp = *fl) != NULL) { |
1668 | *fl = tp->next; | |
a48b5a61 PM |
1669 | tcf_destroy(tp); |
1670 | } | |
1671 | } | |
1672 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1673 | ||
1da177e4 LT |
1674 | #ifdef CONFIG_PROC_FS |
1675 | static int psched_show(struct seq_file *seq, void *v) | |
1676 | { | |
3c0cfc13 PM |
1677 | struct timespec ts; |
1678 | ||
1679 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1680 | seq_printf(seq, "%08x %08x %08x %08x\n", |
ca44d6e6 | 1681 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1682 | 1000000, |
3c0cfc13 | 1683 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1684 | |
1685 | return 0; | |
1686 | } | |
1687 | ||
1688 | static int psched_open(struct inode *inode, struct file *file) | |
1689 | { | |
7e5ab157 | 1690 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1691 | } |
1692 | ||
da7071d7 | 1693 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1694 | .owner = THIS_MODULE, |
1695 | .open = psched_open, | |
1696 | .read = seq_read, | |
1697 | .llseek = seq_lseek, | |
1698 | .release = single_release, | |
10297b99 | 1699 | }; |
7316ae88 TG |
1700 | |
1701 | static int __net_init psched_net_init(struct net *net) | |
1702 | { | |
1703 | struct proc_dir_entry *e; | |
1704 | ||
1705 | e = proc_net_fops_create(net, "psched", 0, &psched_fops); | |
1706 | if (e == NULL) | |
1707 | return -ENOMEM; | |
1708 | ||
1709 | return 0; | |
1710 | } | |
1711 | ||
1712 | static void __net_exit psched_net_exit(struct net *net) | |
1713 | { | |
1714 | proc_net_remove(net, "psched"); | |
7316ae88 TG |
1715 | } |
1716 | #else | |
1717 | static int __net_init psched_net_init(struct net *net) | |
1718 | { | |
1719 | return 0; | |
1720 | } | |
1721 | ||
1722 | static void __net_exit psched_net_exit(struct net *net) | |
1723 | { | |
1724 | } | |
1da177e4 LT |
1725 | #endif |
1726 | ||
7316ae88 TG |
1727 | static struct pernet_operations psched_net_ops = { |
1728 | .init = psched_net_init, | |
1729 | .exit = psched_net_exit, | |
1730 | }; | |
1731 | ||
1da177e4 LT |
1732 | static int __init pktsched_init(void) |
1733 | { | |
7316ae88 TG |
1734 | int err; |
1735 | ||
1736 | err = register_pernet_subsys(&psched_net_ops); | |
1737 | if (err) { | |
1738 | printk(KERN_ERR "pktsched_init: " | |
1739 | "cannot initialize per netns operations\n"); | |
1740 | return err; | |
1741 | } | |
1742 | ||
1da177e4 LT |
1743 | register_qdisc(&pfifo_qdisc_ops); |
1744 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1745 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1746 | register_qdisc(&mq_qdisc_ops); |
1da177e4 | 1747 | |
be577ddc TG |
1748 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
1749 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); | |
1750 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); | |
1751 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); | |
1752 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); | |
1753 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); | |
1754 | ||
1da177e4 LT |
1755 | return 0; |
1756 | } | |
1757 | ||
1758 | subsys_initcall(pktsched_init); |