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 | ||
21eb2189 | 138 | /* Register/unregister queueing discipline */ |
1da177e4 LT |
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 | 152 | if (qops->peek == NULL) { |
68fd26b5 | 153 | if (qops->dequeue == NULL) |
99c0db26 | 154 | qops->peek = noop_qdisc_ops.peek; |
68fd26b5 JP |
155 | else |
156 | goto out_einval; | |
99c0db26 | 157 | } |
1da177e4 LT |
158 | if (qops->dequeue == NULL) |
159 | qops->dequeue = noop_qdisc_ops.dequeue; | |
160 | ||
68fd26b5 JP |
161 | if (qops->cl_ops) { |
162 | const struct Qdisc_class_ops *cops = qops->cl_ops; | |
163 | ||
3e9e5a59 | 164 | if (!(cops->get && cops->put && cops->walk && cops->leaf)) |
68fd26b5 JP |
165 | goto out_einval; |
166 | ||
167 | if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf)) | |
168 | goto out_einval; | |
169 | } | |
170 | ||
1da177e4 LT |
171 | qops->next = NULL; |
172 | *qp = qops; | |
173 | rc = 0; | |
174 | out: | |
175 | write_unlock(&qdisc_mod_lock); | |
176 | return rc; | |
68fd26b5 JP |
177 | |
178 | out_einval: | |
179 | rc = -EINVAL; | |
180 | goto out; | |
1da177e4 | 181 | } |
62e3ba1b | 182 | EXPORT_SYMBOL(register_qdisc); |
1da177e4 LT |
183 | |
184 | int unregister_qdisc(struct Qdisc_ops *qops) | |
185 | { | |
186 | struct Qdisc_ops *q, **qp; | |
187 | int err = -ENOENT; | |
188 | ||
189 | write_lock(&qdisc_mod_lock); | |
cc7ec456 | 190 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
1da177e4 LT |
191 | if (q == qops) |
192 | break; | |
193 | if (q) { | |
194 | *qp = q->next; | |
195 | q->next = NULL; | |
196 | err = 0; | |
197 | } | |
198 | write_unlock(&qdisc_mod_lock); | |
199 | return err; | |
200 | } | |
62e3ba1b | 201 | EXPORT_SYMBOL(unregister_qdisc); |
1da177e4 | 202 | |
6da7c8fc | 203 | /* Get default qdisc if not otherwise specified */ |
204 | void qdisc_get_default(char *name, size_t len) | |
205 | { | |
206 | read_lock(&qdisc_mod_lock); | |
207 | strlcpy(name, default_qdisc_ops->id, len); | |
208 | read_unlock(&qdisc_mod_lock); | |
209 | } | |
210 | ||
211 | static struct Qdisc_ops *qdisc_lookup_default(const char *name) | |
212 | { | |
213 | struct Qdisc_ops *q = NULL; | |
214 | ||
215 | for (q = qdisc_base; q; q = q->next) { | |
216 | if (!strcmp(name, q->id)) { | |
217 | if (!try_module_get(q->owner)) | |
218 | q = NULL; | |
219 | break; | |
220 | } | |
221 | } | |
222 | ||
223 | return q; | |
224 | } | |
225 | ||
226 | /* Set new default qdisc to use */ | |
227 | int qdisc_set_default(const char *name) | |
228 | { | |
229 | const struct Qdisc_ops *ops; | |
230 | ||
231 | if (!capable(CAP_NET_ADMIN)) | |
232 | return -EPERM; | |
233 | ||
234 | write_lock(&qdisc_mod_lock); | |
235 | ops = qdisc_lookup_default(name); | |
236 | if (!ops) { | |
237 | /* Not found, drop lock and try to load module */ | |
238 | write_unlock(&qdisc_mod_lock); | |
239 | request_module("sch_%s", name); | |
240 | write_lock(&qdisc_mod_lock); | |
241 | ||
242 | ops = qdisc_lookup_default(name); | |
243 | } | |
244 | ||
245 | if (ops) { | |
246 | /* Set new default */ | |
247 | module_put(default_qdisc_ops->owner); | |
248 | default_qdisc_ops = ops; | |
249 | } | |
250 | write_unlock(&qdisc_mod_lock); | |
251 | ||
252 | return ops ? 0 : -ENOENT; | |
253 | } | |
254 | ||
1da177e4 | 255 | /* We know handle. Find qdisc among all qdisc's attached to device |
4eaf3b84 ED |
256 | * (root qdisc, all its children, children of children etc.) |
257 | * Note: caller either uses rtnl or rcu_read_lock() | |
1da177e4 LT |
258 | */ |
259 | ||
6113b748 | 260 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
261 | { |
262 | struct Qdisc *q; | |
263 | ||
264 | if (!(root->flags & TCQ_F_BUILTIN) && | |
265 | root->handle == handle) | |
266 | return root; | |
267 | ||
4eaf3b84 | 268 | list_for_each_entry_rcu(q, &root->list, list) { |
8123b421 DM |
269 | if (q->handle == handle) |
270 | return q; | |
271 | } | |
272 | return NULL; | |
273 | } | |
274 | ||
95dc1929 | 275 | void qdisc_list_add(struct Qdisc *q) |
f6e0b239 | 276 | { |
37314363 ED |
277 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
278 | struct Qdisc *root = qdisc_dev(q)->qdisc; | |
e57a784d | 279 | |
37314363 | 280 | WARN_ON_ONCE(root == &noop_qdisc); |
4eaf3b84 ED |
281 | ASSERT_RTNL(); |
282 | list_add_tail_rcu(&q->list, &root->list); | |
37314363 | 283 | } |
f6e0b239 | 284 | } |
95dc1929 | 285 | EXPORT_SYMBOL(qdisc_list_add); |
f6e0b239 JP |
286 | |
287 | void qdisc_list_del(struct Qdisc *q) | |
288 | { | |
4eaf3b84 ED |
289 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
290 | ASSERT_RTNL(); | |
291 | list_del_rcu(&q->list); | |
292 | } | |
f6e0b239 JP |
293 | } |
294 | EXPORT_SYMBOL(qdisc_list_del); | |
295 | ||
ead81cc5 | 296 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 297 | { |
f6e0b239 JP |
298 | struct Qdisc *q; |
299 | ||
af356afa PM |
300 | q = qdisc_match_from_root(dev->qdisc, handle); |
301 | if (q) | |
302 | goto out; | |
f6e0b239 | 303 | |
24824a09 ED |
304 | if (dev_ingress_queue(dev)) |
305 | q = qdisc_match_from_root( | |
306 | dev_ingress_queue(dev)->qdisc_sleeping, | |
307 | handle); | |
f6486d40 | 308 | out: |
f6e0b239 | 309 | return q; |
1da177e4 LT |
310 | } |
311 | ||
312 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
313 | { | |
314 | unsigned long cl; | |
315 | struct Qdisc *leaf; | |
20fea08b | 316 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
317 | |
318 | if (cops == NULL) | |
319 | return NULL; | |
320 | cl = cops->get(p, classid); | |
321 | ||
322 | if (cl == 0) | |
323 | return NULL; | |
324 | leaf = cops->leaf(p, cl); | |
325 | cops->put(p, cl); | |
326 | return leaf; | |
327 | } | |
328 | ||
329 | /* Find queueing discipline by name */ | |
330 | ||
1e90474c | 331 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
332 | { |
333 | struct Qdisc_ops *q = NULL; | |
334 | ||
335 | if (kind) { | |
336 | read_lock(&qdisc_mod_lock); | |
337 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 338 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
339 | if (!try_module_get(q->owner)) |
340 | q = NULL; | |
341 | break; | |
342 | } | |
343 | } | |
344 | read_unlock(&qdisc_mod_lock); | |
345 | } | |
346 | return q; | |
347 | } | |
348 | ||
8a8e3d84 JDB |
349 | /* The linklayer setting were not transferred from iproute2, in older |
350 | * versions, and the rate tables lookup systems have been dropped in | |
351 | * the kernel. To keep backward compatible with older iproute2 tc | |
352 | * utils, we detect the linklayer setting by detecting if the rate | |
353 | * table were modified. | |
354 | * | |
355 | * For linklayer ATM table entries, the rate table will be aligned to | |
356 | * 48 bytes, thus some table entries will contain the same value. The | |
357 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
358 | * starting from the mpu, we find low and high table entries for | |
359 | * mapping this cell. If these entries contain the same value, when | |
360 | * the rate tables have been modified for linklayer ATM. | |
361 | * | |
362 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
363 | * and then roundup to the next cell, calc the table entry one below, | |
364 | * and compare. | |
365 | */ | |
366 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
367 | { | |
368 | int low = roundup(r->mpu, 48); | |
369 | int high = roundup(low+1, 48); | |
370 | int cell_low = low >> r->cell_log; | |
371 | int cell_high = (high >> r->cell_log) - 1; | |
372 | ||
373 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
374 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
375 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
376 | return TC_LINKLAYER_ETHERNET; | |
377 | } | |
378 | ||
379 | if ((cell_high > cell_low) && (cell_high < 256) | |
380 | && (rtab[cell_low] == rtab[cell_high])) { | |
381 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
382 | cell_low, cell_high, rtab[cell_high]); | |
383 | return TC_LINKLAYER_ATM; | |
384 | } | |
385 | return TC_LINKLAYER_ETHERNET; | |
386 | } | |
387 | ||
1da177e4 LT |
388 | static struct qdisc_rate_table *qdisc_rtab_list; |
389 | ||
1e90474c | 390 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
391 | { |
392 | struct qdisc_rate_table *rtab; | |
393 | ||
40edeff6 ED |
394 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
395 | nla_len(tab) != TC_RTAB_SIZE) | |
396 | return NULL; | |
397 | ||
1da177e4 | 398 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
399 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
400 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
401 | rtab->refcnt++; |
402 | return rtab; | |
403 | } | |
404 | } | |
405 | ||
1da177e4 LT |
406 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
407 | if (rtab) { | |
408 | rtab->rate = *r; | |
409 | rtab->refcnt = 1; | |
1e90474c | 410 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
411 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
412 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
413 | rtab->next = qdisc_rtab_list; |
414 | qdisc_rtab_list = rtab; | |
415 | } | |
416 | return rtab; | |
417 | } | |
62e3ba1b | 418 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
419 | |
420 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
421 | { | |
422 | struct qdisc_rate_table *rtab, **rtabp; | |
423 | ||
424 | if (!tab || --tab->refcnt) | |
425 | return; | |
426 | ||
cc7ec456 ED |
427 | for (rtabp = &qdisc_rtab_list; |
428 | (rtab = *rtabp) != NULL; | |
429 | rtabp = &rtab->next) { | |
1da177e4 LT |
430 | if (rtab == tab) { |
431 | *rtabp = rtab->next; | |
432 | kfree(rtab); | |
433 | return; | |
434 | } | |
435 | } | |
436 | } | |
62e3ba1b | 437 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 438 | |
175f9c1b JK |
439 | static LIST_HEAD(qdisc_stab_list); |
440 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
441 | ||
442 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
443 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
444 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
445 | }; | |
446 | ||
447 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
448 | { | |
449 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
450 | struct qdisc_size_table *stab; | |
451 | struct tc_sizespec *s; | |
452 | unsigned int tsize = 0; | |
453 | u16 *tab = NULL; | |
454 | int err; | |
455 | ||
456 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
457 | if (err < 0) | |
458 | return ERR_PTR(err); | |
459 | if (!tb[TCA_STAB_BASE]) | |
460 | return ERR_PTR(-EINVAL); | |
461 | ||
462 | s = nla_data(tb[TCA_STAB_BASE]); | |
463 | ||
464 | if (s->tsize > 0) { | |
465 | if (!tb[TCA_STAB_DATA]) | |
466 | return ERR_PTR(-EINVAL); | |
467 | tab = nla_data(tb[TCA_STAB_DATA]); | |
468 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
469 | } | |
470 | ||
00093fab | 471 | if (tsize != s->tsize || (!tab && tsize > 0)) |
175f9c1b JK |
472 | return ERR_PTR(-EINVAL); |
473 | ||
f3b9605d | 474 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
475 | |
476 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
477 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
478 | continue; | |
479 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
480 | continue; | |
481 | stab->refcnt++; | |
f3b9605d | 482 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
483 | return stab; |
484 | } | |
485 | ||
f3b9605d | 486 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
487 | |
488 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
489 | if (!stab) | |
490 | return ERR_PTR(-ENOMEM); | |
491 | ||
492 | stab->refcnt = 1; | |
493 | stab->szopts = *s; | |
494 | if (tsize > 0) | |
495 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
496 | ||
f3b9605d | 497 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 498 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 499 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
500 | |
501 | return stab; | |
502 | } | |
503 | ||
a2da570d ED |
504 | static void stab_kfree_rcu(struct rcu_head *head) |
505 | { | |
506 | kfree(container_of(head, struct qdisc_size_table, rcu)); | |
507 | } | |
508 | ||
175f9c1b JK |
509 | void qdisc_put_stab(struct qdisc_size_table *tab) |
510 | { | |
511 | if (!tab) | |
512 | return; | |
513 | ||
f3b9605d | 514 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
515 | |
516 | if (--tab->refcnt == 0) { | |
517 | list_del(&tab->list); | |
a2da570d | 518 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
175f9c1b JK |
519 | } |
520 | ||
f3b9605d | 521 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
522 | } |
523 | EXPORT_SYMBOL(qdisc_put_stab); | |
524 | ||
525 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
526 | { | |
527 | struct nlattr *nest; | |
528 | ||
529 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
530 | if (nest == NULL) |
531 | goto nla_put_failure; | |
1b34ec43 DM |
532 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
533 | goto nla_put_failure; | |
175f9c1b JK |
534 | nla_nest_end(skb, nest); |
535 | ||
536 | return skb->len; | |
537 | ||
538 | nla_put_failure: | |
539 | return -1; | |
540 | } | |
541 | ||
a2da570d | 542 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab) |
175f9c1b JK |
543 | { |
544 | int pkt_len, slot; | |
545 | ||
546 | pkt_len = skb->len + stab->szopts.overhead; | |
547 | if (unlikely(!stab->szopts.tsize)) | |
548 | goto out; | |
549 | ||
550 | slot = pkt_len + stab->szopts.cell_align; | |
551 | if (unlikely(slot < 0)) | |
552 | slot = 0; | |
553 | ||
554 | slot >>= stab->szopts.cell_log; | |
555 | if (likely(slot < stab->szopts.tsize)) | |
556 | pkt_len = stab->data[slot]; | |
557 | else | |
558 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
559 | (slot / stab->szopts.tsize) + | |
560 | stab->data[slot % stab->szopts.tsize]; | |
561 | ||
562 | pkt_len <<= stab->szopts.size_log; | |
563 | out: | |
564 | if (unlikely(pkt_len < 1)) | |
565 | pkt_len = 1; | |
566 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
567 | } | |
a2da570d | 568 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 569 | |
6e765a00 | 570 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc) |
b00355db JP |
571 | { |
572 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
573 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
574 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
575 | qdisc->flags |= TCQ_F_WARN_NONWC; |
576 | } | |
577 | } | |
578 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
579 | ||
4179477f PM |
580 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
581 | { | |
582 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 583 | timer); |
4179477f | 584 | |
1e203c1a | 585 | rcu_read_lock(); |
fd245a4a | 586 | qdisc_unthrottled(wd->qdisc); |
8608db03 | 587 | __netif_schedule(qdisc_root(wd->qdisc)); |
1e203c1a | 588 | rcu_read_unlock(); |
1936502d | 589 | |
4179477f PM |
590 | return HRTIMER_NORESTART; |
591 | } | |
592 | ||
593 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
594 | { | |
4a8e320c | 595 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); |
2fbd3da3 | 596 | wd->timer.function = qdisc_watchdog; |
4179477f PM |
597 | wd->qdisc = qdisc; |
598 | } | |
599 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
600 | ||
f2600cf0 | 601 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle) |
4179477f | 602 | { |
2540e051 JP |
603 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
604 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
605 | return; | |
606 | ||
f2600cf0 ED |
607 | if (throttle) |
608 | qdisc_throttled(wd->qdisc); | |
46baac38 ED |
609 | |
610 | hrtimer_start(&wd->timer, | |
34c5d292 | 611 | ns_to_ktime(expires), |
4a8e320c | 612 | HRTIMER_MODE_ABS_PINNED); |
4179477f | 613 | } |
34c5d292 | 614 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
4179477f PM |
615 | |
616 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
617 | { | |
2fbd3da3 | 618 | hrtimer_cancel(&wd->timer); |
fd245a4a | 619 | qdisc_unthrottled(wd->qdisc); |
4179477f PM |
620 | } |
621 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 622 | |
a94f779f | 623 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
624 | { |
625 | unsigned int size = n * sizeof(struct hlist_head), i; | |
626 | struct hlist_head *h; | |
627 | ||
628 | if (size <= PAGE_SIZE) | |
629 | h = kmalloc(size, GFP_KERNEL); | |
630 | else | |
631 | h = (struct hlist_head *) | |
632 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
633 | ||
634 | if (h != NULL) { | |
635 | for (i = 0; i < n; i++) | |
636 | INIT_HLIST_HEAD(&h[i]); | |
637 | } | |
638 | return h; | |
639 | } | |
640 | ||
641 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
642 | { | |
643 | unsigned int size = n * sizeof(struct hlist_head); | |
644 | ||
645 | if (size <= PAGE_SIZE) | |
646 | kfree(h); | |
647 | else | |
648 | free_pages((unsigned long)h, get_order(size)); | |
649 | } | |
650 | ||
651 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
652 | { | |
653 | struct Qdisc_class_common *cl; | |
b67bfe0d | 654 | struct hlist_node *next; |
6fe1c7a5 PM |
655 | struct hlist_head *nhash, *ohash; |
656 | unsigned int nsize, nmask, osize; | |
657 | unsigned int i, h; | |
658 | ||
659 | /* Rehash when load factor exceeds 0.75 */ | |
660 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
661 | return; | |
662 | nsize = clhash->hashsize * 2; | |
663 | nmask = nsize - 1; | |
664 | nhash = qdisc_class_hash_alloc(nsize); | |
665 | if (nhash == NULL) | |
666 | return; | |
667 | ||
668 | ohash = clhash->hash; | |
669 | osize = clhash->hashsize; | |
670 | ||
671 | sch_tree_lock(sch); | |
672 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 673 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
674 | h = qdisc_class_hash(cl->classid, nmask); |
675 | hlist_add_head(&cl->hnode, &nhash[h]); | |
676 | } | |
677 | } | |
678 | clhash->hash = nhash; | |
679 | clhash->hashsize = nsize; | |
680 | clhash->hashmask = nmask; | |
681 | sch_tree_unlock(sch); | |
682 | ||
683 | qdisc_class_hash_free(ohash, osize); | |
684 | } | |
685 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
686 | ||
687 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
688 | { | |
689 | unsigned int size = 4; | |
690 | ||
691 | clhash->hash = qdisc_class_hash_alloc(size); | |
692 | if (clhash->hash == NULL) | |
693 | return -ENOMEM; | |
694 | clhash->hashsize = size; | |
695 | clhash->hashmask = size - 1; | |
696 | clhash->hashelems = 0; | |
697 | return 0; | |
698 | } | |
699 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
700 | ||
701 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
702 | { | |
703 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
704 | } | |
705 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
706 | ||
707 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
708 | struct Qdisc_class_common *cl) | |
709 | { | |
710 | unsigned int h; | |
711 | ||
712 | INIT_HLIST_NODE(&cl->hnode); | |
713 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
714 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
715 | clhash->hashelems++; | |
716 | } | |
717 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
718 | ||
719 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
720 | struct Qdisc_class_common *cl) | |
721 | { | |
722 | hlist_del(&cl->hnode); | |
723 | clhash->hashelems--; | |
724 | } | |
725 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
726 | ||
fa0f5aa7 ED |
727 | /* Allocate an unique handle from space managed by kernel |
728 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
729 | */ | |
1da177e4 LT |
730 | static u32 qdisc_alloc_handle(struct net_device *dev) |
731 | { | |
fa0f5aa7 | 732 | int i = 0x8000; |
1da177e4 LT |
733 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
734 | ||
735 | do { | |
736 | autohandle += TC_H_MAKE(0x10000U, 0); | |
737 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
738 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
739 | if (!qdisc_lookup(dev, autohandle)) |
740 | return autohandle; | |
741 | cond_resched(); | |
742 | } while (--i > 0); | |
1da177e4 | 743 | |
fa0f5aa7 | 744 | return 0; |
1da177e4 LT |
745 | } |
746 | ||
43effa1e PM |
747 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
748 | { | |
20fea08b | 749 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
750 | unsigned long cl; |
751 | u32 parentid; | |
2c8c8e6f | 752 | int drops; |
43effa1e PM |
753 | |
754 | if (n == 0) | |
755 | return; | |
2c8c8e6f | 756 | drops = max_t(int, n, 0); |
4eaf3b84 | 757 | rcu_read_lock(); |
43effa1e | 758 | while ((parentid = sch->parent)) { |
066a3b5b | 759 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
4eaf3b84 | 760 | break; |
066a3b5b | 761 | |
4eaf3b84 ED |
762 | if (sch->flags & TCQ_F_NOPARENT) |
763 | break; | |
764 | /* TODO: perform the search on a per txq basis */ | |
5ce2d488 | 765 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa | 766 | if (sch == NULL) { |
4eaf3b84 ED |
767 | WARN_ON_ONCE(parentid != TC_H_ROOT); |
768 | break; | |
ffc8fefa | 769 | } |
43effa1e PM |
770 | cops = sch->ops->cl_ops; |
771 | if (cops->qlen_notify) { | |
772 | cl = cops->get(sch, parentid); | |
773 | cops->qlen_notify(sch, cl); | |
774 | cops->put(sch, cl); | |
775 | } | |
776 | sch->q.qlen -= n; | |
25331d6c | 777 | __qdisc_qstats_drop(sch, drops); |
43effa1e | 778 | } |
4eaf3b84 | 779 | rcu_read_unlock(); |
43effa1e PM |
780 | } |
781 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 782 | |
7316ae88 TG |
783 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
784 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
785 | struct Qdisc *old, struct Qdisc *new) |
786 | { | |
787 | if (new || old) | |
7316ae88 | 788 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 789 | |
4d8863a2 | 790 | if (old) |
99194cff | 791 | qdisc_destroy(old); |
99194cff DM |
792 | } |
793 | ||
794 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
795 | * to device "dev". | |
796 | * | |
797 | * When appropriate send a netlink notification using 'skb' | |
798 | * and "n". | |
799 | * | |
800 | * On success, destroy old qdisc. | |
1da177e4 LT |
801 | */ |
802 | ||
803 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
804 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
805 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 806 | { |
99194cff | 807 | struct Qdisc *q = old; |
7316ae88 | 808 | struct net *net = dev_net(dev); |
1da177e4 | 809 | int err = 0; |
1da177e4 | 810 | |
10297b99 | 811 | if (parent == NULL) { |
99194cff DM |
812 | unsigned int i, num_q, ingress; |
813 | ||
814 | ingress = 0; | |
815 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
816 | if ((q && q->flags & TCQ_F_INGRESS) || |
817 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
818 | num_q = 1; |
819 | ingress = 1; | |
24824a09 ED |
820 | if (!dev_ingress_queue(dev)) |
821 | return -ENOENT; | |
99194cff DM |
822 | } |
823 | ||
824 | if (dev->flags & IFF_UP) | |
825 | dev_deactivate(dev); | |
826 | ||
86e363dc WC |
827 | if (new && new->ops->attach) |
828 | goto skip; | |
6ec1c69a | 829 | |
99194cff | 830 | for (i = 0; i < num_q; i++) { |
24824a09 | 831 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
832 | |
833 | if (!ingress) | |
834 | dev_queue = netdev_get_tx_queue(dev, i); | |
835 | ||
8d50b53d DM |
836 | old = dev_graft_qdisc(dev_queue, new); |
837 | if (new && i > 0) | |
838 | atomic_inc(&new->refcnt); | |
839 | ||
036d6a67 JP |
840 | if (!ingress) |
841 | qdisc_destroy(old); | |
1da177e4 | 842 | } |
99194cff | 843 | |
86e363dc | 844 | skip: |
036d6a67 | 845 | if (!ingress) { |
7316ae88 TG |
846 | notify_and_destroy(net, skb, n, classid, |
847 | dev->qdisc, new); | |
036d6a67 JP |
848 | if (new && !new->ops->attach) |
849 | atomic_inc(&new->refcnt); | |
850 | dev->qdisc = new ? : &noop_qdisc; | |
86e363dc WC |
851 | |
852 | if (new && new->ops->attach) | |
853 | new->ops->attach(new); | |
036d6a67 | 854 | } else { |
7316ae88 | 855 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 856 | } |
af356afa | 857 | |
99194cff DM |
858 | if (dev->flags & IFF_UP) |
859 | dev_activate(dev); | |
1da177e4 | 860 | } else { |
20fea08b | 861 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 862 | |
c9f1d038 PM |
863 | err = -EOPNOTSUPP; |
864 | if (cops && cops->graft) { | |
1da177e4 LT |
865 | unsigned long cl = cops->get(parent, classid); |
866 | if (cl) { | |
99194cff | 867 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 868 | cops->put(parent, cl); |
c9f1d038 PM |
869 | } else |
870 | err = -ENOENT; | |
1da177e4 | 871 | } |
99194cff | 872 | if (!err) |
7316ae88 | 873 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
874 | } |
875 | return err; | |
876 | } | |
877 | ||
25bfcd5a JP |
878 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
879 | static struct lock_class_key qdisc_tx_lock; | |
880 | static struct lock_class_key qdisc_rx_lock; | |
881 | ||
1da177e4 LT |
882 | /* |
883 | Allocate and initialize new qdisc. | |
884 | ||
885 | Parameters are passed via opt. | |
886 | */ | |
887 | ||
888 | static struct Qdisc * | |
bb949fbd | 889 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
23bcf634 PM |
890 | struct Qdisc *p, u32 parent, u32 handle, |
891 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
892 | { |
893 | int err; | |
1e90474c | 894 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
895 | struct Qdisc *sch; |
896 | struct Qdisc_ops *ops; | |
175f9c1b | 897 | struct qdisc_size_table *stab; |
1da177e4 LT |
898 | |
899 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 900 | #ifdef CONFIG_MODULES |
1da177e4 LT |
901 | if (ops == NULL && kind != NULL) { |
902 | char name[IFNAMSIZ]; | |
1e90474c | 903 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
904 | /* We dropped the RTNL semaphore in order to |
905 | * perform the module load. So, even if we | |
906 | * succeeded in loading the module we have to | |
907 | * tell the caller to replay the request. We | |
908 | * indicate this using -EAGAIN. | |
909 | * We replay the request because the device may | |
910 | * go away in the mean time. | |
911 | */ | |
912 | rtnl_unlock(); | |
913 | request_module("sch_%s", name); | |
914 | rtnl_lock(); | |
915 | ops = qdisc_lookup_ops(kind); | |
916 | if (ops != NULL) { | |
917 | /* We will try again qdisc_lookup_ops, | |
918 | * so don't keep a reference. | |
919 | */ | |
920 | module_put(ops->owner); | |
921 | err = -EAGAIN; | |
922 | goto err_out; | |
923 | } | |
924 | } | |
925 | } | |
926 | #endif | |
927 | ||
b9e2cc0f | 928 | err = -ENOENT; |
1da177e4 LT |
929 | if (ops == NULL) |
930 | goto err_out; | |
931 | ||
5ce2d488 | 932 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
933 | if (IS_ERR(sch)) { |
934 | err = PTR_ERR(sch); | |
1da177e4 | 935 | goto err_out2; |
3d54b82f | 936 | } |
1da177e4 | 937 | |
ffc8fefa PM |
938 | sch->parent = parent; |
939 | ||
3d54b82f | 940 | if (handle == TC_H_INGRESS) { |
1da177e4 | 941 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 942 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 943 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 944 | } else { |
fd44de7c PM |
945 | if (handle == 0) { |
946 | handle = qdisc_alloc_handle(dev); | |
947 | err = -ENOMEM; | |
948 | if (handle == 0) | |
949 | goto err_out3; | |
950 | } | |
25bfcd5a | 951 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1abbe139 | 952 | if (!netif_is_multiqueue(dev)) |
225734de | 953 | sch->flags |= TCQ_F_ONETXQUEUE; |
1da177e4 LT |
954 | } |
955 | ||
3d54b82f | 956 | sch->handle = handle; |
1da177e4 | 957 | |
1e90474c | 958 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
22e0f8b9 JF |
959 | if (qdisc_is_percpu_stats(sch)) { |
960 | sch->cpu_bstats = | |
7c1c97d5 | 961 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
22e0f8b9 JF |
962 | if (!sch->cpu_bstats) |
963 | goto err_out4; | |
b0ab6f92 JF |
964 | |
965 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
966 | if (!sch->cpu_qstats) | |
967 | goto err_out4; | |
22e0f8b9 JF |
968 | } |
969 | ||
175f9c1b JK |
970 | if (tca[TCA_STAB]) { |
971 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
972 | if (IS_ERR(stab)) { | |
973 | err = PTR_ERR(stab); | |
7c64b9f3 | 974 | goto err_out4; |
175f9c1b | 975 | } |
a2da570d | 976 | rcu_assign_pointer(sch->stab, stab); |
175f9c1b | 977 | } |
1e90474c | 978 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
979 | spinlock_t *root_lock; |
980 | ||
23bcf634 PM |
981 | err = -EOPNOTSUPP; |
982 | if (sch->flags & TCQ_F_MQROOT) | |
983 | goto err_out4; | |
984 | ||
f6f9b93f | 985 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
986 | !(sch->flags & TCQ_F_INGRESS) && |
987 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
f6f9b93f JP |
988 | root_lock = qdisc_root_sleeping_lock(sch); |
989 | else | |
990 | root_lock = qdisc_lock(sch); | |
991 | ||
22e0f8b9 JF |
992 | err = gen_new_estimator(&sch->bstats, |
993 | sch->cpu_bstats, | |
994 | &sch->rate_est, | |
995 | root_lock, | |
996 | tca[TCA_RATE]); | |
23bcf634 PM |
997 | if (err) |
998 | goto err_out4; | |
023e09a7 | 999 | } |
f6e0b239 JP |
1000 | |
1001 | qdisc_list_add(sch); | |
1da177e4 | 1002 | |
1da177e4 LT |
1003 | return sch; |
1004 | } | |
1005 | err_out3: | |
1006 | dev_put(dev); | |
3d54b82f | 1007 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
1008 | err_out2: |
1009 | module_put(ops->owner); | |
1010 | err_out: | |
1011 | *errp = err; | |
1da177e4 | 1012 | return NULL; |
23bcf634 PM |
1013 | |
1014 | err_out4: | |
22e0f8b9 | 1015 | free_percpu(sch->cpu_bstats); |
b0ab6f92 | 1016 | free_percpu(sch->cpu_qstats); |
23bcf634 PM |
1017 | /* |
1018 | * Any broken qdiscs that would require a ops->reset() here? | |
1019 | * The qdisc was never in action so it shouldn't be necessary. | |
1020 | */ | |
a2da570d | 1021 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
1022 | if (ops->destroy) |
1023 | ops->destroy(sch); | |
1024 | goto err_out3; | |
1da177e4 LT |
1025 | } |
1026 | ||
1e90474c | 1027 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 1028 | { |
a2da570d | 1029 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1030 | int err = 0; |
1da177e4 | 1031 | |
175f9c1b | 1032 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
1033 | if (sch->ops->change == NULL) |
1034 | return -EINVAL; | |
1e90474c | 1035 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
1036 | if (err) |
1037 | return err; | |
1038 | } | |
175f9c1b JK |
1039 | |
1040 | if (tca[TCA_STAB]) { | |
1041 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
1042 | if (IS_ERR(stab)) | |
1043 | return PTR_ERR(stab); | |
1044 | } | |
1045 | ||
a2da570d ED |
1046 | ostab = rtnl_dereference(sch->stab); |
1047 | rcu_assign_pointer(sch->stab, stab); | |
1048 | qdisc_put_stab(ostab); | |
175f9c1b | 1049 | |
23bcf634 | 1050 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1051 | /* NB: ignores errors from replace_estimator |
1052 | because change can't be undone. */ | |
23bcf634 PM |
1053 | if (sch->flags & TCQ_F_MQROOT) |
1054 | goto out; | |
22e0f8b9 JF |
1055 | gen_replace_estimator(&sch->bstats, |
1056 | sch->cpu_bstats, | |
1057 | &sch->rate_est, | |
1058 | qdisc_root_sleeping_lock(sch), | |
1059 | tca[TCA_RATE]); | |
23bcf634 PM |
1060 | } |
1061 | out: | |
1da177e4 LT |
1062 | return 0; |
1063 | } | |
1064 | ||
cc7ec456 ED |
1065 | struct check_loop_arg { |
1066 | struct qdisc_walker w; | |
1da177e4 LT |
1067 | struct Qdisc *p; |
1068 | int depth; | |
1069 | }; | |
1070 | ||
1071 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
1072 | ||
1073 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1074 | { | |
1075 | struct check_loop_arg arg; | |
1076 | ||
1077 | if (q->ops->cl_ops == NULL) | |
1078 | return 0; | |
1079 | ||
1080 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1081 | arg.w.fn = check_loop_fn; | |
1082 | arg.depth = depth; | |
1083 | arg.p = p; | |
1084 | q->ops->cl_ops->walk(q, &arg.w); | |
1085 | return arg.w.stop ? -ELOOP : 0; | |
1086 | } | |
1087 | ||
1088 | static int | |
1089 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1090 | { | |
1091 | struct Qdisc *leaf; | |
20fea08b | 1092 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1093 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1094 | ||
1095 | leaf = cops->leaf(q, cl); | |
1096 | if (leaf) { | |
1097 | if (leaf == arg->p || arg->depth > 7) | |
1098 | return -ELOOP; | |
1099 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1100 | } | |
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | * Delete/get qdisc. | |
1106 | */ | |
1107 | ||
661d2967 | 1108 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1109 | { |
3b1e0a65 | 1110 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1111 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1112 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1113 | struct net_device *dev; |
de179c8c | 1114 | u32 clid; |
1da177e4 LT |
1115 | struct Qdisc *q = NULL; |
1116 | struct Qdisc *p = NULL; | |
1117 | int err; | |
1118 | ||
4e8bbb81 | 1119 | if ((n->nlmsg_type != RTM_GETQDISC) && |
5f013c9b | 1120 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1121 | return -EPERM; |
1122 | ||
1e90474c PM |
1123 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1124 | if (err < 0) | |
1125 | return err; | |
1126 | ||
de179c8c H |
1127 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1128 | if (!dev) | |
1129 | return -ENODEV; | |
1130 | ||
1131 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1132 | if (clid) { |
1133 | if (clid != TC_H_ROOT) { | |
1134 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 ED |
1135 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1136 | if (!p) | |
1da177e4 LT |
1137 | return -ENOENT; |
1138 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1139 | } else if (dev_ingress_queue(dev)) { |
1140 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1141 | } |
1da177e4 | 1142 | } else { |
af356afa | 1143 | q = dev->qdisc; |
1da177e4 LT |
1144 | } |
1145 | if (!q) | |
1146 | return -ENOENT; | |
1147 | ||
1148 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
1149 | return -EINVAL; | |
1150 | } else { | |
cc7ec456 ED |
1151 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1152 | if (!q) | |
1da177e4 LT |
1153 | return -ENOENT; |
1154 | } | |
1155 | ||
1e90474c | 1156 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1157 | return -EINVAL; |
1158 | ||
1159 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1160 | if (!clid) | |
1161 | return -EINVAL; | |
1162 | if (q->handle == 0) | |
1163 | return -ENOENT; | |
cc7ec456 ED |
1164 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
1165 | if (err != 0) | |
1da177e4 | 1166 | return err; |
1da177e4 | 1167 | } else { |
7316ae88 | 1168 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1169 | } |
1170 | return 0; | |
1171 | } | |
1172 | ||
1173 | /* | |
cc7ec456 | 1174 | * Create/change qdisc. |
1da177e4 LT |
1175 | */ |
1176 | ||
661d2967 | 1177 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1178 | { |
3b1e0a65 | 1179 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1180 | struct tcmsg *tcm; |
1e90474c | 1181 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1182 | struct net_device *dev; |
1183 | u32 clid; | |
1184 | struct Qdisc *q, *p; | |
1185 | int err; | |
1186 | ||
5f013c9b | 1187 | if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1188 | return -EPERM; |
1189 | ||
1da177e4 LT |
1190 | replay: |
1191 | /* Reinit, just in case something touches this. */ | |
de179c8c H |
1192 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1193 | if (err < 0) | |
1194 | return err; | |
1195 | ||
02ef22ca | 1196 | tcm = nlmsg_data(n); |
1da177e4 LT |
1197 | clid = tcm->tcm_parent; |
1198 | q = p = NULL; | |
1199 | ||
cc7ec456 ED |
1200 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1201 | if (!dev) | |
1da177e4 LT |
1202 | return -ENODEV; |
1203 | ||
1e90474c | 1204 | |
1da177e4 LT |
1205 | if (clid) { |
1206 | if (clid != TC_H_ROOT) { | |
1207 | if (clid != TC_H_INGRESS) { | |
cc7ec456 ED |
1208 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1209 | if (!p) | |
1da177e4 LT |
1210 | return -ENOENT; |
1211 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1212 | } else if (dev_ingress_queue_create(dev)) { |
1213 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1214 | } |
1215 | } else { | |
af356afa | 1216 | q = dev->qdisc; |
1da177e4 LT |
1217 | } |
1218 | ||
1219 | /* It may be default qdisc, ignore it */ | |
1220 | if (q && q->handle == 0) | |
1221 | q = NULL; | |
1222 | ||
1223 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1224 | if (tcm->tcm_handle) { | |
cc7ec456 | 1225 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
1da177e4 LT |
1226 | return -EEXIST; |
1227 | if (TC_H_MIN(tcm->tcm_handle)) | |
1228 | return -EINVAL; | |
cc7ec456 ED |
1229 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1230 | if (!q) | |
1da177e4 | 1231 | goto create_n_graft; |
cc7ec456 | 1232 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1233 | return -EEXIST; |
1e90474c | 1234 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1235 | return -EINVAL; |
1236 | if (q == p || | |
1237 | (p && check_loop(q, p, 0))) | |
1238 | return -ELOOP; | |
1239 | atomic_inc(&q->refcnt); | |
1240 | goto graft; | |
1241 | } else { | |
cc7ec456 | 1242 | if (!q) |
1da177e4 LT |
1243 | goto create_n_graft; |
1244 | ||
1245 | /* This magic test requires explanation. | |
1246 | * | |
1247 | * We know, that some child q is already | |
1248 | * attached to this parent and have choice: | |
1249 | * either to change it or to create/graft new one. | |
1250 | * | |
1251 | * 1. We are allowed to create/graft only | |
1252 | * if CREATE and REPLACE flags are set. | |
1253 | * | |
1254 | * 2. If EXCL is set, requestor wanted to say, | |
1255 | * that qdisc tcm_handle is not expected | |
1256 | * to exist, so that we choose create/graft too. | |
1257 | * | |
1258 | * 3. The last case is when no flags are set. | |
1259 | * Alas, it is sort of hole in API, we | |
1260 | * cannot decide what to do unambiguously. | |
1261 | * For now we select create/graft, if | |
1262 | * user gave KIND, which does not match existing. | |
1263 | */ | |
cc7ec456 ED |
1264 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1265 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1266 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1267 | (tca[TCA_KIND] && |
1268 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1269 | goto create_n_graft; |
1270 | } | |
1271 | } | |
1272 | } else { | |
1273 | if (!tcm->tcm_handle) | |
1274 | return -EINVAL; | |
1275 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1276 | } | |
1277 | ||
1278 | /* Change qdisc parameters */ | |
1279 | if (q == NULL) | |
1280 | return -ENOENT; | |
cc7ec456 | 1281 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1282 | return -EEXIST; |
1e90474c | 1283 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1284 | return -EINVAL; |
1285 | err = qdisc_change(q, tca); | |
1286 | if (err == 0) | |
7316ae88 | 1287 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1288 | return err; |
1289 | ||
1290 | create_n_graft: | |
cc7ec456 | 1291 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
1da177e4 | 1292 | return -ENOENT; |
24824a09 ED |
1293 | if (clid == TC_H_INGRESS) { |
1294 | if (dev_ingress_queue(dev)) | |
1295 | q = qdisc_create(dev, dev_ingress_queue(dev), p, | |
1296 | tcm->tcm_parent, tcm->tcm_parent, | |
1297 | tca, &err); | |
1298 | else | |
1299 | err = -ENOENT; | |
1300 | } else { | |
926e61b7 | 1301 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1302 | |
1303 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1304 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1305 | else if (p) | |
1306 | dev_queue = p->dev_queue; | |
1307 | else | |
1308 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1309 | |
926e61b7 | 1310 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1311 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1312 | tca, &err); |
6ec1c69a | 1313 | } |
1da177e4 LT |
1314 | if (q == NULL) { |
1315 | if (err == -EAGAIN) | |
1316 | goto replay; | |
1317 | return err; | |
1318 | } | |
1319 | ||
1320 | graft: | |
e5befbd9 IJ |
1321 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1322 | if (err) { | |
1323 | if (q) | |
1324 | qdisc_destroy(q); | |
1325 | return err; | |
1da177e4 | 1326 | } |
e5befbd9 | 1327 | |
1da177e4 LT |
1328 | return 0; |
1329 | } | |
1330 | ||
1331 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
15e47304 | 1332 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 | 1333 | { |
22e0f8b9 | 1334 | struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; |
b0ab6f92 | 1335 | struct gnet_stats_queue __percpu *cpu_qstats = NULL; |
1da177e4 LT |
1336 | struct tcmsg *tcm; |
1337 | struct nlmsghdr *nlh; | |
27a884dc | 1338 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1339 | struct gnet_dump d; |
a2da570d | 1340 | struct qdisc_size_table *stab; |
64015853 | 1341 | __u32 qlen; |
1da177e4 | 1342 | |
fba373d2 | 1343 | cond_resched(); |
15e47304 | 1344 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1345 | if (!nlh) |
1346 | goto out_nlmsg_trim; | |
1347 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1348 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 PM |
1349 | tcm->tcm__pad1 = 0; |
1350 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1351 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1352 | tcm->tcm_parent = clid; |
1353 | tcm->tcm_handle = q->handle; | |
1354 | tcm->tcm_info = atomic_read(&q->refcnt); | |
1b34ec43 DM |
1355 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1356 | goto nla_put_failure; | |
1da177e4 | 1357 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1358 | goto nla_put_failure; |
64015853 | 1359 | qlen = q->q.qlen; |
1da177e4 | 1360 | |
a2da570d ED |
1361 | stab = rtnl_dereference(q->stab); |
1362 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
175f9c1b JK |
1363 | goto nla_put_failure; |
1364 | ||
102396ae JP |
1365 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1366 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1367 | goto nla_put_failure; |
1da177e4 LT |
1368 | |
1369 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1370 | goto nla_put_failure; |
1da177e4 | 1371 | |
b0ab6f92 | 1372 | if (qdisc_is_percpu_stats(q)) { |
22e0f8b9 | 1373 | cpu_bstats = q->cpu_bstats; |
b0ab6f92 JF |
1374 | cpu_qstats = q->cpu_qstats; |
1375 | } | |
22e0f8b9 JF |
1376 | |
1377 | if (gnet_stats_copy_basic(&d, cpu_bstats, &q->bstats) < 0 || | |
d250a5f9 | 1378 | gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || |
b0ab6f92 | 1379 | gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0) |
1e90474c | 1380 | goto nla_put_failure; |
10297b99 | 1381 | |
1da177e4 | 1382 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1383 | goto nla_put_failure; |
10297b99 | 1384 | |
27a884dc | 1385 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1386 | return skb->len; |
1387 | ||
02ef22ca | 1388 | out_nlmsg_trim: |
1e90474c | 1389 | nla_put_failure: |
dc5fc579 | 1390 | nlmsg_trim(skb, b); |
1da177e4 LT |
1391 | return -1; |
1392 | } | |
1393 | ||
53b0f080 ED |
1394 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1395 | { | |
1396 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1397 | } | |
1398 | ||
7316ae88 TG |
1399 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1400 | struct nlmsghdr *n, u32 clid, | |
1401 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1402 | { |
1403 | struct sk_buff *skb; | |
15e47304 | 1404 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1405 | |
1406 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1407 | if (!skb) | |
1408 | return -ENOBUFS; | |
1409 | ||
53b0f080 | 1410 | if (old && !tc_qdisc_dump_ignore(old)) { |
15e47304 | 1411 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1412 | 0, RTM_DELQDISC) < 0) |
1da177e4 LT |
1413 | goto err_out; |
1414 | } | |
53b0f080 | 1415 | if (new && !tc_qdisc_dump_ignore(new)) { |
15e47304 | 1416 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1417 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
1da177e4 LT |
1418 | goto err_out; |
1419 | } | |
1420 | ||
1421 | if (skb->len) | |
15e47304 | 1422 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1423 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1424 | |
1425 | err_out: | |
1426 | kfree_skb(skb); | |
1427 | return -EINVAL; | |
1428 | } | |
1429 | ||
30723673 DM |
1430 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1431 | struct netlink_callback *cb, | |
1432 | int *q_idx_p, int s_q_idx) | |
1433 | { | |
1434 | int ret = 0, q_idx = *q_idx_p; | |
1435 | struct Qdisc *q; | |
1436 | ||
1437 | if (!root) | |
1438 | return 0; | |
1439 | ||
1440 | q = root; | |
1441 | if (q_idx < s_q_idx) { | |
1442 | q_idx++; | |
1443 | } else { | |
1444 | if (!tc_qdisc_dump_ignore(q) && | |
15e47304 | 1445 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1446 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1447 | goto done; | |
1448 | q_idx++; | |
1449 | } | |
1450 | list_for_each_entry(q, &root->list, list) { | |
1451 | if (q_idx < s_q_idx) { | |
1452 | q_idx++; | |
1453 | continue; | |
1454 | } | |
cc7ec456 | 1455 | if (!tc_qdisc_dump_ignore(q) && |
15e47304 | 1456 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1457 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1458 | goto done; | |
1459 | q_idx++; | |
1460 | } | |
1461 | ||
1462 | out: | |
1463 | *q_idx_p = q_idx; | |
1464 | return ret; | |
1465 | done: | |
1466 | ret = -1; | |
1467 | goto out; | |
1468 | } | |
1469 | ||
1da177e4 LT |
1470 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1471 | { | |
3b1e0a65 | 1472 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1473 | int idx, q_idx; |
1474 | int s_idx, s_q_idx; | |
1475 | struct net_device *dev; | |
1da177e4 LT |
1476 | |
1477 | s_idx = cb->args[0]; | |
1478 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1479 | |
7562f876 | 1480 | idx = 0; |
15dc36eb ED |
1481 | ASSERT_RTNL(); |
1482 | for_each_netdev(net, dev) { | |
30723673 DM |
1483 | struct netdev_queue *dev_queue; |
1484 | ||
1da177e4 | 1485 | if (idx < s_idx) |
7562f876 | 1486 | goto cont; |
1da177e4 LT |
1487 | if (idx > s_idx) |
1488 | s_q_idx = 0; | |
1da177e4 | 1489 | q_idx = 0; |
30723673 | 1490 | |
af356afa | 1491 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1492 | goto done; |
1493 | ||
24824a09 ED |
1494 | dev_queue = dev_ingress_queue(dev); |
1495 | if (dev_queue && | |
1496 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
1497 | &q_idx, s_q_idx) < 0) | |
30723673 DM |
1498 | goto done; |
1499 | ||
7562f876 PE |
1500 | cont: |
1501 | idx++; | |
1da177e4 LT |
1502 | } |
1503 | ||
1504 | done: | |
1da177e4 LT |
1505 | cb->args[0] = idx; |
1506 | cb->args[1] = q_idx; | |
1507 | ||
1508 | return skb->len; | |
1509 | } | |
1510 | ||
1511 | ||
1512 | ||
1513 | /************************************************ | |
1514 | * Traffic classes manipulation. * | |
1515 | ************************************************/ | |
1516 | ||
1517 | ||
1518 | ||
661d2967 | 1519 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1520 | { |
3b1e0a65 | 1521 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1522 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1523 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1524 | struct net_device *dev; |
1525 | struct Qdisc *q = NULL; | |
20fea08b | 1526 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1527 | unsigned long cl = 0; |
1528 | unsigned long new_cl; | |
de179c8c H |
1529 | u32 portid; |
1530 | u32 clid; | |
1531 | u32 qid; | |
1da177e4 LT |
1532 | int err; |
1533 | ||
4e8bbb81 | 1534 | if ((n->nlmsg_type != RTM_GETTCLASS) && |
5f013c9b | 1535 | !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1536 | return -EPERM; |
1537 | ||
1e90474c PM |
1538 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1539 | if (err < 0) | |
1540 | return err; | |
1541 | ||
de179c8c H |
1542 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1543 | if (!dev) | |
1544 | return -ENODEV; | |
1545 | ||
1da177e4 LT |
1546 | /* |
1547 | parent == TC_H_UNSPEC - unspecified parent. | |
1548 | parent == TC_H_ROOT - class is root, which has no parent. | |
1549 | parent == X:0 - parent is root class. | |
1550 | parent == X:Y - parent is a node in hierarchy. | |
1551 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1552 | ||
1553 | handle == 0:0 - generate handle from kernel pool. | |
1554 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1555 | handle == X:Y - clear. | |
1556 | handle == X:0 - root class. | |
1557 | */ | |
1558 | ||
1559 | /* Step 1. Determine qdisc handle X:0 */ | |
1560 | ||
de179c8c H |
1561 | portid = tcm->tcm_parent; |
1562 | clid = tcm->tcm_handle; | |
1563 | qid = TC_H_MAJ(clid); | |
1564 | ||
15e47304 EB |
1565 | if (portid != TC_H_ROOT) { |
1566 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
1567 | |
1568 | if (qid && qid1) { | |
1569 | /* If both majors are known, they must be identical. */ | |
1570 | if (qid != qid1) | |
1571 | return -EINVAL; | |
1572 | } else if (qid1) { | |
1573 | qid = qid1; | |
1574 | } else if (qid == 0) | |
af356afa | 1575 | qid = dev->qdisc->handle; |
1da177e4 LT |
1576 | |
1577 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1578 | * both with parent and child. |
1579 | * | |
15e47304 | 1580 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 1581 | */ |
15e47304 EB |
1582 | if (portid) |
1583 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
1584 | } else { |
1585 | if (qid == 0) | |
af356afa | 1586 | qid = dev->qdisc->handle; |
1da177e4 LT |
1587 | } |
1588 | ||
1589 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1590 | q = qdisc_lookup(dev, qid); |
1591 | if (!q) | |
1da177e4 LT |
1592 | return -ENOENT; |
1593 | ||
1594 | /* An check that it supports classes */ | |
1595 | cops = q->ops->cl_ops; | |
1596 | if (cops == NULL) | |
1597 | return -EINVAL; | |
1598 | ||
1599 | /* Now try to get class */ | |
1600 | if (clid == 0) { | |
15e47304 | 1601 | if (portid == TC_H_ROOT) |
1da177e4 LT |
1602 | clid = qid; |
1603 | } else | |
1604 | clid = TC_H_MAKE(qid, clid); | |
1605 | ||
1606 | if (clid) | |
1607 | cl = cops->get(q, clid); | |
1608 | ||
1609 | if (cl == 0) { | |
1610 | err = -ENOENT; | |
cc7ec456 ED |
1611 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1612 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1613 | goto out; |
1614 | } else { | |
1615 | switch (n->nlmsg_type) { | |
10297b99 | 1616 | case RTM_NEWTCLASS: |
1da177e4 | 1617 | err = -EEXIST; |
cc7ec456 | 1618 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1619 | goto out; |
1620 | break; | |
1621 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1622 | err = -EOPNOTSUPP; |
1623 | if (cops->delete) | |
1624 | err = cops->delete(q, cl); | |
1da177e4 | 1625 | if (err == 0) |
7316ae88 | 1626 | tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); |
1da177e4 LT |
1627 | goto out; |
1628 | case RTM_GETTCLASS: | |
7316ae88 | 1629 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1630 | goto out; |
1631 | default: | |
1632 | err = -EINVAL; | |
1633 | goto out; | |
1634 | } | |
1635 | } | |
1636 | ||
1637 | new_cl = cl; | |
de6d5cdf PM |
1638 | err = -EOPNOTSUPP; |
1639 | if (cops->change) | |
15e47304 | 1640 | err = cops->change(q, clid, portid, tca, &new_cl); |
1da177e4 | 1641 | if (err == 0) |
7316ae88 | 1642 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1643 | |
1644 | out: | |
1645 | if (cl) | |
1646 | cops->put(q, cl); | |
1647 | ||
1648 | return err; | |
1649 | } | |
1650 | ||
1651 | ||
1652 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1653 | unsigned long cl, | |
15e47304 | 1654 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1655 | { |
1656 | struct tcmsg *tcm; | |
1657 | struct nlmsghdr *nlh; | |
27a884dc | 1658 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1659 | struct gnet_dump d; |
20fea08b | 1660 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1661 | |
fba373d2 | 1662 | cond_resched(); |
15e47304 | 1663 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1664 | if (!nlh) |
1665 | goto out_nlmsg_trim; | |
1666 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1667 | tcm->tcm_family = AF_UNSPEC; |
16ebb5e0 ED |
1668 | tcm->tcm__pad1 = 0; |
1669 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1670 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1671 | tcm->tcm_parent = q->handle; |
1672 | tcm->tcm_handle = q->handle; | |
1673 | tcm->tcm_info = 0; | |
1b34ec43 DM |
1674 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1675 | goto nla_put_failure; | |
1da177e4 | 1676 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1677 | goto nla_put_failure; |
1da177e4 | 1678 | |
102396ae JP |
1679 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1680 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1681 | goto nla_put_failure; |
1da177e4 LT |
1682 | |
1683 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1684 | goto nla_put_failure; |
1da177e4 LT |
1685 | |
1686 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1687 | goto nla_put_failure; |
1da177e4 | 1688 | |
27a884dc | 1689 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1690 | return skb->len; |
1691 | ||
02ef22ca | 1692 | out_nlmsg_trim: |
1e90474c | 1693 | nla_put_failure: |
dc5fc579 | 1694 | nlmsg_trim(skb, b); |
1da177e4 LT |
1695 | return -1; |
1696 | } | |
1697 | ||
7316ae88 TG |
1698 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1699 | struct nlmsghdr *n, struct Qdisc *q, | |
1700 | unsigned long cl, int event) | |
1da177e4 LT |
1701 | { |
1702 | struct sk_buff *skb; | |
15e47304 | 1703 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1704 | |
1705 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1706 | if (!skb) | |
1707 | return -ENOBUFS; | |
1708 | ||
15e47304 | 1709 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { |
1da177e4 LT |
1710 | kfree_skb(skb); |
1711 | return -EINVAL; | |
1712 | } | |
1713 | ||
15e47304 | 1714 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1715 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1716 | } |
1717 | ||
cc7ec456 ED |
1718 | struct qdisc_dump_args { |
1719 | struct qdisc_walker w; | |
1720 | struct sk_buff *skb; | |
1721 | struct netlink_callback *cb; | |
1da177e4 LT |
1722 | }; |
1723 | ||
1724 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1725 | { | |
1726 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1727 | ||
15e47304 | 1728 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
1da177e4 LT |
1729 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); |
1730 | } | |
1731 | ||
30723673 DM |
1732 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1733 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1734 | int *t_p, int s_t) | |
1735 | { | |
1736 | struct qdisc_dump_args arg; | |
1737 | ||
1738 | if (tc_qdisc_dump_ignore(q) || | |
1739 | *t_p < s_t || !q->ops->cl_ops || | |
1740 | (tcm->tcm_parent && | |
1741 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1742 | (*t_p)++; | |
1743 | return 0; | |
1744 | } | |
1745 | if (*t_p > s_t) | |
1746 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1747 | arg.w.fn = qdisc_class_dump; | |
1748 | arg.skb = skb; | |
1749 | arg.cb = cb; | |
1750 | arg.w.stop = 0; | |
1751 | arg.w.skip = cb->args[1]; | |
1752 | arg.w.count = 0; | |
1753 | q->ops->cl_ops->walk(q, &arg.w); | |
1754 | cb->args[1] = arg.w.count; | |
1755 | if (arg.w.stop) | |
1756 | return -1; | |
1757 | (*t_p)++; | |
1758 | return 0; | |
1759 | } | |
1760 | ||
1761 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1762 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1763 | int *t_p, int s_t) | |
1764 | { | |
1765 | struct Qdisc *q; | |
1766 | ||
1767 | if (!root) | |
1768 | return 0; | |
1769 | ||
1770 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1771 | return -1; | |
1772 | ||
1773 | list_for_each_entry(q, &root->list, list) { | |
1774 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1775 | return -1; | |
1776 | } | |
1777 | ||
1778 | return 0; | |
1779 | } | |
1780 | ||
1da177e4 LT |
1781 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1782 | { | |
02ef22ca | 1783 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 1784 | struct net *net = sock_net(skb->sk); |
30723673 | 1785 | struct netdev_queue *dev_queue; |
1da177e4 | 1786 | struct net_device *dev; |
30723673 | 1787 | int t, s_t; |
1da177e4 | 1788 | |
573ce260 | 1789 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1790 | return 0; |
cc7ec456 ED |
1791 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
1792 | if (!dev) | |
1da177e4 LT |
1793 | return 0; |
1794 | ||
1795 | s_t = cb->args[0]; | |
1796 | t = 0; | |
1797 | ||
af356afa | 1798 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1799 | goto done; |
1800 | ||
24824a09 ED |
1801 | dev_queue = dev_ingress_queue(dev); |
1802 | if (dev_queue && | |
1803 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
1804 | &t, s_t) < 0) | |
30723673 | 1805 | goto done; |
1da177e4 | 1806 | |
30723673 | 1807 | done: |
1da177e4 LT |
1808 | cb->args[0] = t; |
1809 | ||
1810 | dev_put(dev); | |
1811 | return skb->len; | |
1812 | } | |
1813 | ||
1814 | /* Main classifier routine: scans classifier chain attached | |
cc7ec456 ED |
1815 | * to this qdisc, (optionally) tests for protocol and asks |
1816 | * specific classifiers. | |
1da177e4 | 1817 | */ |
3b3ae880 DB |
1818 | int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1819 | struct tcf_result *res, bool compat_mode) | |
73ca4918 | 1820 | { |
d8b9605d | 1821 | __be16 protocol = tc_skb_protocol(skb); |
3b3ae880 DB |
1822 | #ifdef CONFIG_NET_CLS_ACT |
1823 | const struct tcf_proto *old_tp = tp; | |
1824 | int limit = 0; | |
73ca4918 | 1825 | |
3b3ae880 DB |
1826 | reclassify: |
1827 | #endif | |
25d8c0d5 | 1828 | for (; tp; tp = rcu_dereference_bh(tp->next)) { |
3b3ae880 DB |
1829 | int err; |
1830 | ||
cc7ec456 ED |
1831 | if (tp->protocol != protocol && |
1832 | tp->protocol != htons(ETH_P_ALL)) | |
1833 | continue; | |
cc7ec456 | 1834 | |
3b3ae880 DB |
1835 | err = tp->classify(skb, tp, res); |
1836 | #ifdef CONFIG_NET_CLS_ACT | |
c1b3b199 | 1837 | if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) |
3b3ae880 DB |
1838 | goto reset; |
1839 | #endif | |
e578d9c0 | 1840 | if (err >= 0) |
73ca4918 | 1841 | return err; |
73ca4918 | 1842 | } |
73ca4918 | 1843 | |
3b3ae880 | 1844 | return -1; |
1da177e4 | 1845 | #ifdef CONFIG_NET_CLS_ACT |
3b3ae880 DB |
1846 | reset: |
1847 | if (unlikely(limit++ >= MAX_REC_LOOP)) { | |
c1b3b199 DB |
1848 | net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", |
1849 | tp->q->ops->id, tp->prio & 0xffff, | |
1850 | ntohs(tp->protocol)); | |
3b3ae880 | 1851 | return TC_ACT_SHOT; |
1da177e4 | 1852 | } |
3b3ae880 DB |
1853 | |
1854 | tp = old_tp; | |
1855 | goto reclassify; | |
73ca4918 | 1856 | #endif |
1da177e4 | 1857 | } |
73ca4918 | 1858 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1859 | |
1e052be6 | 1860 | bool tcf_destroy(struct tcf_proto *tp, bool force) |
a48b5a61 | 1861 | { |
1e052be6 CW |
1862 | if (tp->ops->destroy(tp, force)) { |
1863 | module_put(tp->ops->owner); | |
1864 | kfree_rcu(tp, rcu); | |
1865 | return true; | |
1866 | } | |
1867 | ||
1868 | return false; | |
a48b5a61 PM |
1869 | } |
1870 | ||
25d8c0d5 | 1871 | void tcf_destroy_chain(struct tcf_proto __rcu **fl) |
a48b5a61 PM |
1872 | { |
1873 | struct tcf_proto *tp; | |
1874 | ||
25d8c0d5 JF |
1875 | while ((tp = rtnl_dereference(*fl)) != NULL) { |
1876 | RCU_INIT_POINTER(*fl, tp->next); | |
1e052be6 | 1877 | tcf_destroy(tp, true); |
a48b5a61 PM |
1878 | } |
1879 | } | |
1880 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1881 | ||
1da177e4 LT |
1882 | #ifdef CONFIG_PROC_FS |
1883 | static int psched_show(struct seq_file *seq, void *v) | |
1884 | { | |
1885 | seq_printf(seq, "%08x %08x %08x %08x\n", | |
ca44d6e6 | 1886 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1887 | 1000000, |
1e317688 | 1888 | (u32)NSEC_PER_SEC / hrtimer_resolution); |
1da177e4 LT |
1889 | |
1890 | return 0; | |
1891 | } | |
1892 | ||
1893 | static int psched_open(struct inode *inode, struct file *file) | |
1894 | { | |
7e5ab157 | 1895 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1896 | } |
1897 | ||
da7071d7 | 1898 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1899 | .owner = THIS_MODULE, |
1900 | .open = psched_open, | |
1901 | .read = seq_read, | |
1902 | .llseek = seq_lseek, | |
1903 | .release = single_release, | |
10297b99 | 1904 | }; |
7316ae88 TG |
1905 | |
1906 | static int __net_init psched_net_init(struct net *net) | |
1907 | { | |
1908 | struct proc_dir_entry *e; | |
1909 | ||
d4beaa66 | 1910 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
7316ae88 TG |
1911 | if (e == NULL) |
1912 | return -ENOMEM; | |
1913 | ||
1914 | return 0; | |
1915 | } | |
1916 | ||
1917 | static void __net_exit psched_net_exit(struct net *net) | |
1918 | { | |
ece31ffd | 1919 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
1920 | } |
1921 | #else | |
1922 | static int __net_init psched_net_init(struct net *net) | |
1923 | { | |
1924 | return 0; | |
1925 | } | |
1926 | ||
1927 | static void __net_exit psched_net_exit(struct net *net) | |
1928 | { | |
1929 | } | |
1da177e4 LT |
1930 | #endif |
1931 | ||
7316ae88 TG |
1932 | static struct pernet_operations psched_net_ops = { |
1933 | .init = psched_net_init, | |
1934 | .exit = psched_net_exit, | |
1935 | }; | |
1936 | ||
1da177e4 LT |
1937 | static int __init pktsched_init(void) |
1938 | { | |
7316ae88 TG |
1939 | int err; |
1940 | ||
1941 | err = register_pernet_subsys(&psched_net_ops); | |
1942 | if (err) { | |
cc7ec456 | 1943 | pr_err("pktsched_init: " |
7316ae88 TG |
1944 | "cannot initialize per netns operations\n"); |
1945 | return err; | |
1946 | } | |
1947 | ||
6da7c8fc | 1948 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
1949 | register_qdisc(&pfifo_qdisc_ops); |
1950 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1951 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1952 | register_qdisc(&mq_qdisc_ops); |
d66d6c31 | 1953 | register_qdisc(&noqueue_qdisc_ops); |
1da177e4 | 1954 | |
c7ac8679 GR |
1955 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL); |
1956 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL); | |
1957 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL); | |
1958 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL); | |
1959 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL); | |
1960 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL); | |
be577ddc | 1961 | |
1da177e4 LT |
1962 | return 0; |
1963 | } | |
1964 | ||
1965 | subsys_initcall(pktsched_init); |