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 LT |
255 | /* We know handle. Find qdisc among all qdisc's attached to device |
256 | (root qdisc, all its children, children of children etc.) | |
257 | */ | |
258 | ||
6113b748 | 259 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
260 | { |
261 | struct Qdisc *q; | |
262 | ||
263 | if (!(root->flags & TCQ_F_BUILTIN) && | |
264 | root->handle == handle) | |
265 | return root; | |
266 | ||
267 | list_for_each_entry(q, &root->list, list) { | |
268 | if (q->handle == handle) | |
269 | return q; | |
270 | } | |
271 | return NULL; | |
272 | } | |
273 | ||
95dc1929 | 274 | void qdisc_list_add(struct Qdisc *q) |
f6e0b239 | 275 | { |
37314363 ED |
276 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
277 | struct Qdisc *root = qdisc_dev(q)->qdisc; | |
e57a784d | 278 | |
37314363 | 279 | WARN_ON_ONCE(root == &noop_qdisc); |
e57a784d | 280 | list_add_tail(&q->list, &root->list); |
37314363 | 281 | } |
f6e0b239 | 282 | } |
95dc1929 | 283 | EXPORT_SYMBOL(qdisc_list_add); |
f6e0b239 JP |
284 | |
285 | void qdisc_list_del(struct Qdisc *q) | |
286 | { | |
f6486d40 | 287 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
f6e0b239 | 288 | list_del(&q->list); |
f6e0b239 JP |
289 | } |
290 | EXPORT_SYMBOL(qdisc_list_del); | |
291 | ||
ead81cc5 | 292 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 293 | { |
f6e0b239 JP |
294 | struct Qdisc *q; |
295 | ||
af356afa PM |
296 | q = qdisc_match_from_root(dev->qdisc, handle); |
297 | if (q) | |
298 | goto out; | |
f6e0b239 | 299 | |
24824a09 ED |
300 | if (dev_ingress_queue(dev)) |
301 | q = qdisc_match_from_root( | |
302 | dev_ingress_queue(dev)->qdisc_sleeping, | |
303 | handle); | |
f6486d40 | 304 | out: |
f6e0b239 | 305 | return q; |
1da177e4 LT |
306 | } |
307 | ||
308 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
309 | { | |
310 | unsigned long cl; | |
311 | struct Qdisc *leaf; | |
20fea08b | 312 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
313 | |
314 | if (cops == NULL) | |
315 | return NULL; | |
316 | cl = cops->get(p, classid); | |
317 | ||
318 | if (cl == 0) | |
319 | return NULL; | |
320 | leaf = cops->leaf(p, cl); | |
321 | cops->put(p, cl); | |
322 | return leaf; | |
323 | } | |
324 | ||
325 | /* Find queueing discipline by name */ | |
326 | ||
1e90474c | 327 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
328 | { |
329 | struct Qdisc_ops *q = NULL; | |
330 | ||
331 | if (kind) { | |
332 | read_lock(&qdisc_mod_lock); | |
333 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 334 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
335 | if (!try_module_get(q->owner)) |
336 | q = NULL; | |
337 | break; | |
338 | } | |
339 | } | |
340 | read_unlock(&qdisc_mod_lock); | |
341 | } | |
342 | return q; | |
343 | } | |
344 | ||
8a8e3d84 JDB |
345 | /* The linklayer setting were not transferred from iproute2, in older |
346 | * versions, and the rate tables lookup systems have been dropped in | |
347 | * the kernel. To keep backward compatible with older iproute2 tc | |
348 | * utils, we detect the linklayer setting by detecting if the rate | |
349 | * table were modified. | |
350 | * | |
351 | * For linklayer ATM table entries, the rate table will be aligned to | |
352 | * 48 bytes, thus some table entries will contain the same value. The | |
353 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
354 | * starting from the mpu, we find low and high table entries for | |
355 | * mapping this cell. If these entries contain the same value, when | |
356 | * the rate tables have been modified for linklayer ATM. | |
357 | * | |
358 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
359 | * and then roundup to the next cell, calc the table entry one below, | |
360 | * and compare. | |
361 | */ | |
362 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
363 | { | |
364 | int low = roundup(r->mpu, 48); | |
365 | int high = roundup(low+1, 48); | |
366 | int cell_low = low >> r->cell_log; | |
367 | int cell_high = (high >> r->cell_log) - 1; | |
368 | ||
369 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
370 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
371 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
372 | return TC_LINKLAYER_ETHERNET; | |
373 | } | |
374 | ||
375 | if ((cell_high > cell_low) && (cell_high < 256) | |
376 | && (rtab[cell_low] == rtab[cell_high])) { | |
377 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
378 | cell_low, cell_high, rtab[cell_high]); | |
379 | return TC_LINKLAYER_ATM; | |
380 | } | |
381 | return TC_LINKLAYER_ETHERNET; | |
382 | } | |
383 | ||
1da177e4 LT |
384 | static struct qdisc_rate_table *qdisc_rtab_list; |
385 | ||
1e90474c | 386 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
387 | { |
388 | struct qdisc_rate_table *rtab; | |
389 | ||
40edeff6 ED |
390 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
391 | nla_len(tab) != TC_RTAB_SIZE) | |
392 | return NULL; | |
393 | ||
1da177e4 | 394 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
395 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
396 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
397 | rtab->refcnt++; |
398 | return rtab; | |
399 | } | |
400 | } | |
401 | ||
1da177e4 LT |
402 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
403 | if (rtab) { | |
404 | rtab->rate = *r; | |
405 | rtab->refcnt = 1; | |
1e90474c | 406 | memcpy(rtab->data, nla_data(tab), 1024); |
8a8e3d84 JDB |
407 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
408 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
409 | rtab->next = qdisc_rtab_list; |
410 | qdisc_rtab_list = rtab; | |
411 | } | |
412 | return rtab; | |
413 | } | |
62e3ba1b | 414 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
415 | |
416 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
417 | { | |
418 | struct qdisc_rate_table *rtab, **rtabp; | |
419 | ||
420 | if (!tab || --tab->refcnt) | |
421 | return; | |
422 | ||
cc7ec456 ED |
423 | for (rtabp = &qdisc_rtab_list; |
424 | (rtab = *rtabp) != NULL; | |
425 | rtabp = &rtab->next) { | |
1da177e4 LT |
426 | if (rtab == tab) { |
427 | *rtabp = rtab->next; | |
428 | kfree(rtab); | |
429 | return; | |
430 | } | |
431 | } | |
432 | } | |
62e3ba1b | 433 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 434 | |
175f9c1b JK |
435 | static LIST_HEAD(qdisc_stab_list); |
436 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
437 | ||
438 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
439 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
440 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
441 | }; | |
442 | ||
443 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
444 | { | |
445 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
446 | struct qdisc_size_table *stab; | |
447 | struct tc_sizespec *s; | |
448 | unsigned int tsize = 0; | |
449 | u16 *tab = NULL; | |
450 | int err; | |
451 | ||
452 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
453 | if (err < 0) | |
454 | return ERR_PTR(err); | |
455 | if (!tb[TCA_STAB_BASE]) | |
456 | return ERR_PTR(-EINVAL); | |
457 | ||
458 | s = nla_data(tb[TCA_STAB_BASE]); | |
459 | ||
460 | if (s->tsize > 0) { | |
461 | if (!tb[TCA_STAB_DATA]) | |
462 | return ERR_PTR(-EINVAL); | |
463 | tab = nla_data(tb[TCA_STAB_DATA]); | |
464 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
465 | } | |
466 | ||
00093fab | 467 | if (tsize != s->tsize || (!tab && tsize > 0)) |
175f9c1b JK |
468 | return ERR_PTR(-EINVAL); |
469 | ||
f3b9605d | 470 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
471 | |
472 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
473 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
474 | continue; | |
475 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
476 | continue; | |
477 | stab->refcnt++; | |
f3b9605d | 478 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
479 | return stab; |
480 | } | |
481 | ||
f3b9605d | 482 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
483 | |
484 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
485 | if (!stab) | |
486 | return ERR_PTR(-ENOMEM); | |
487 | ||
488 | stab->refcnt = 1; | |
489 | stab->szopts = *s; | |
490 | if (tsize > 0) | |
491 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
492 | ||
f3b9605d | 493 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 494 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 495 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
496 | |
497 | return stab; | |
498 | } | |
499 | ||
a2da570d ED |
500 | static void stab_kfree_rcu(struct rcu_head *head) |
501 | { | |
502 | kfree(container_of(head, struct qdisc_size_table, rcu)); | |
503 | } | |
504 | ||
175f9c1b JK |
505 | void qdisc_put_stab(struct qdisc_size_table *tab) |
506 | { | |
507 | if (!tab) | |
508 | return; | |
509 | ||
f3b9605d | 510 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
511 | |
512 | if (--tab->refcnt == 0) { | |
513 | list_del(&tab->list); | |
a2da570d | 514 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
175f9c1b JK |
515 | } |
516 | ||
f3b9605d | 517 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
518 | } |
519 | EXPORT_SYMBOL(qdisc_put_stab); | |
520 | ||
521 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
522 | { | |
523 | struct nlattr *nest; | |
524 | ||
525 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
526 | if (nest == NULL) |
527 | goto nla_put_failure; | |
1b34ec43 DM |
528 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
529 | goto nla_put_failure; | |
175f9c1b JK |
530 | nla_nest_end(skb, nest); |
531 | ||
532 | return skb->len; | |
533 | ||
534 | nla_put_failure: | |
535 | return -1; | |
536 | } | |
537 | ||
a2da570d | 538 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab) |
175f9c1b JK |
539 | { |
540 | int pkt_len, slot; | |
541 | ||
542 | pkt_len = skb->len + stab->szopts.overhead; | |
543 | if (unlikely(!stab->szopts.tsize)) | |
544 | goto out; | |
545 | ||
546 | slot = pkt_len + stab->szopts.cell_align; | |
547 | if (unlikely(slot < 0)) | |
548 | slot = 0; | |
549 | ||
550 | slot >>= stab->szopts.cell_log; | |
551 | if (likely(slot < stab->szopts.tsize)) | |
552 | pkt_len = stab->data[slot]; | |
553 | else | |
554 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
555 | (slot / stab->szopts.tsize) + | |
556 | stab->data[slot % stab->szopts.tsize]; | |
557 | ||
558 | pkt_len <<= stab->szopts.size_log; | |
559 | out: | |
560 | if (unlikely(pkt_len < 1)) | |
561 | pkt_len = 1; | |
562 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
563 | } | |
a2da570d | 564 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 565 | |
b00355db JP |
566 | void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc) |
567 | { | |
568 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
569 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
570 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
571 | qdisc->flags |= TCQ_F_WARN_NONWC; |
572 | } | |
573 | } | |
574 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
575 | ||
4179477f PM |
576 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
577 | { | |
578 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 579 | timer); |
4179477f | 580 | |
fd245a4a | 581 | qdisc_unthrottled(wd->qdisc); |
8608db03 | 582 | __netif_schedule(qdisc_root(wd->qdisc)); |
1936502d | 583 | |
4179477f PM |
584 | return HRTIMER_NORESTART; |
585 | } | |
586 | ||
587 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
588 | { | |
2fbd3da3 DM |
589 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
590 | wd->timer.function = qdisc_watchdog; | |
4179477f PM |
591 | wd->qdisc = qdisc; |
592 | } | |
593 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
594 | ||
34c5d292 | 595 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires) |
4179477f | 596 | { |
2540e051 JP |
597 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
598 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
599 | return; | |
600 | ||
fd245a4a | 601 | qdisc_throttled(wd->qdisc); |
46baac38 ED |
602 | |
603 | hrtimer_start(&wd->timer, | |
34c5d292 | 604 | ns_to_ktime(expires), |
46baac38 | 605 | HRTIMER_MODE_ABS); |
4179477f | 606 | } |
34c5d292 | 607 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
4179477f PM |
608 | |
609 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
610 | { | |
2fbd3da3 | 611 | hrtimer_cancel(&wd->timer); |
fd245a4a | 612 | qdisc_unthrottled(wd->qdisc); |
4179477f PM |
613 | } |
614 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 615 | |
a94f779f | 616 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
617 | { |
618 | unsigned int size = n * sizeof(struct hlist_head), i; | |
619 | struct hlist_head *h; | |
620 | ||
621 | if (size <= PAGE_SIZE) | |
622 | h = kmalloc(size, GFP_KERNEL); | |
623 | else | |
624 | h = (struct hlist_head *) | |
625 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
626 | ||
627 | if (h != NULL) { | |
628 | for (i = 0; i < n; i++) | |
629 | INIT_HLIST_HEAD(&h[i]); | |
630 | } | |
631 | return h; | |
632 | } | |
633 | ||
634 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
635 | { | |
636 | unsigned int size = n * sizeof(struct hlist_head); | |
637 | ||
638 | if (size <= PAGE_SIZE) | |
639 | kfree(h); | |
640 | else | |
641 | free_pages((unsigned long)h, get_order(size)); | |
642 | } | |
643 | ||
644 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
645 | { | |
646 | struct Qdisc_class_common *cl; | |
b67bfe0d | 647 | struct hlist_node *next; |
6fe1c7a5 PM |
648 | struct hlist_head *nhash, *ohash; |
649 | unsigned int nsize, nmask, osize; | |
650 | unsigned int i, h; | |
651 | ||
652 | /* Rehash when load factor exceeds 0.75 */ | |
653 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
654 | return; | |
655 | nsize = clhash->hashsize * 2; | |
656 | nmask = nsize - 1; | |
657 | nhash = qdisc_class_hash_alloc(nsize); | |
658 | if (nhash == NULL) | |
659 | return; | |
660 | ||
661 | ohash = clhash->hash; | |
662 | osize = clhash->hashsize; | |
663 | ||
664 | sch_tree_lock(sch); | |
665 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 666 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
667 | h = qdisc_class_hash(cl->classid, nmask); |
668 | hlist_add_head(&cl->hnode, &nhash[h]); | |
669 | } | |
670 | } | |
671 | clhash->hash = nhash; | |
672 | clhash->hashsize = nsize; | |
673 | clhash->hashmask = nmask; | |
674 | sch_tree_unlock(sch); | |
675 | ||
676 | qdisc_class_hash_free(ohash, osize); | |
677 | } | |
678 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
679 | ||
680 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
681 | { | |
682 | unsigned int size = 4; | |
683 | ||
684 | clhash->hash = qdisc_class_hash_alloc(size); | |
685 | if (clhash->hash == NULL) | |
686 | return -ENOMEM; | |
687 | clhash->hashsize = size; | |
688 | clhash->hashmask = size - 1; | |
689 | clhash->hashelems = 0; | |
690 | return 0; | |
691 | } | |
692 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
693 | ||
694 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
695 | { | |
696 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
697 | } | |
698 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
699 | ||
700 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
701 | struct Qdisc_class_common *cl) | |
702 | { | |
703 | unsigned int h; | |
704 | ||
705 | INIT_HLIST_NODE(&cl->hnode); | |
706 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
707 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
708 | clhash->hashelems++; | |
709 | } | |
710 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
711 | ||
712 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
713 | struct Qdisc_class_common *cl) | |
714 | { | |
715 | hlist_del(&cl->hnode); | |
716 | clhash->hashelems--; | |
717 | } | |
718 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
719 | ||
fa0f5aa7 ED |
720 | /* Allocate an unique handle from space managed by kernel |
721 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
722 | */ | |
1da177e4 LT |
723 | static u32 qdisc_alloc_handle(struct net_device *dev) |
724 | { | |
fa0f5aa7 | 725 | int i = 0x8000; |
1da177e4 LT |
726 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
727 | ||
728 | do { | |
729 | autohandle += TC_H_MAKE(0x10000U, 0); | |
730 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
731 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
732 | if (!qdisc_lookup(dev, autohandle)) |
733 | return autohandle; | |
734 | cond_resched(); | |
735 | } while (--i > 0); | |
1da177e4 | 736 | |
fa0f5aa7 | 737 | return 0; |
1da177e4 LT |
738 | } |
739 | ||
43effa1e PM |
740 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
741 | { | |
20fea08b | 742 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
743 | unsigned long cl; |
744 | u32 parentid; | |
2c8c8e6f | 745 | int drops; |
43effa1e PM |
746 | |
747 | if (n == 0) | |
748 | return; | |
2c8c8e6f | 749 | drops = max_t(int, n, 0); |
43effa1e | 750 | while ((parentid = sch->parent)) { |
066a3b5b JP |
751 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
752 | return; | |
753 | ||
5ce2d488 | 754 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
755 | if (sch == NULL) { |
756 | WARN_ON(parentid != TC_H_ROOT); | |
757 | return; | |
758 | } | |
43effa1e PM |
759 | cops = sch->ops->cl_ops; |
760 | if (cops->qlen_notify) { | |
761 | cl = cops->get(sch, parentid); | |
762 | cops->qlen_notify(sch, cl); | |
763 | cops->put(sch, cl); | |
764 | } | |
765 | sch->q.qlen -= n; | |
2c8c8e6f | 766 | sch->qstats.drops += drops; |
43effa1e PM |
767 | } |
768 | } | |
769 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 770 | |
7316ae88 TG |
771 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
772 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
773 | struct Qdisc *old, struct Qdisc *new) |
774 | { | |
775 | if (new || old) | |
7316ae88 | 776 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 777 | |
4d8863a2 | 778 | if (old) |
99194cff | 779 | qdisc_destroy(old); |
99194cff DM |
780 | } |
781 | ||
782 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
783 | * to device "dev". | |
784 | * | |
785 | * When appropriate send a netlink notification using 'skb' | |
786 | * and "n". | |
787 | * | |
788 | * On success, destroy old qdisc. | |
1da177e4 LT |
789 | */ |
790 | ||
791 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
792 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
793 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 794 | { |
99194cff | 795 | struct Qdisc *q = old; |
7316ae88 | 796 | struct net *net = dev_net(dev); |
1da177e4 | 797 | int err = 0; |
1da177e4 | 798 | |
10297b99 | 799 | if (parent == NULL) { |
99194cff DM |
800 | unsigned int i, num_q, ingress; |
801 | ||
802 | ingress = 0; | |
803 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
804 | if ((q && q->flags & TCQ_F_INGRESS) || |
805 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
806 | num_q = 1; |
807 | ingress = 1; | |
24824a09 ED |
808 | if (!dev_ingress_queue(dev)) |
809 | return -ENOENT; | |
99194cff DM |
810 | } |
811 | ||
812 | if (dev->flags & IFF_UP) | |
813 | dev_deactivate(dev); | |
814 | ||
6ec1c69a DM |
815 | if (new && new->ops->attach) { |
816 | new->ops->attach(new); | |
817 | num_q = 0; | |
818 | } | |
819 | ||
99194cff | 820 | for (i = 0; i < num_q; i++) { |
24824a09 | 821 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
822 | |
823 | if (!ingress) | |
824 | dev_queue = netdev_get_tx_queue(dev, i); | |
825 | ||
8d50b53d DM |
826 | old = dev_graft_qdisc(dev_queue, new); |
827 | if (new && i > 0) | |
828 | atomic_inc(&new->refcnt); | |
829 | ||
036d6a67 JP |
830 | if (!ingress) |
831 | qdisc_destroy(old); | |
1da177e4 | 832 | } |
99194cff | 833 | |
036d6a67 | 834 | if (!ingress) { |
7316ae88 TG |
835 | notify_and_destroy(net, skb, n, classid, |
836 | dev->qdisc, new); | |
036d6a67 JP |
837 | if (new && !new->ops->attach) |
838 | atomic_inc(&new->refcnt); | |
839 | dev->qdisc = new ? : &noop_qdisc; | |
840 | } else { | |
7316ae88 | 841 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 842 | } |
af356afa | 843 | |
99194cff DM |
844 | if (dev->flags & IFF_UP) |
845 | dev_activate(dev); | |
1da177e4 | 846 | } else { |
20fea08b | 847 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 848 | |
c9f1d038 PM |
849 | err = -EOPNOTSUPP; |
850 | if (cops && cops->graft) { | |
1da177e4 LT |
851 | unsigned long cl = cops->get(parent, classid); |
852 | if (cl) { | |
99194cff | 853 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 854 | cops->put(parent, cl); |
c9f1d038 PM |
855 | } else |
856 | err = -ENOENT; | |
1da177e4 | 857 | } |
99194cff | 858 | if (!err) |
7316ae88 | 859 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
860 | } |
861 | return err; | |
862 | } | |
863 | ||
25bfcd5a JP |
864 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
865 | static struct lock_class_key qdisc_tx_lock; | |
866 | static struct lock_class_key qdisc_rx_lock; | |
867 | ||
1da177e4 LT |
868 | /* |
869 | Allocate and initialize new qdisc. | |
870 | ||
871 | Parameters are passed via opt. | |
872 | */ | |
873 | ||
874 | static struct Qdisc * | |
bb949fbd | 875 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
23bcf634 PM |
876 | struct Qdisc *p, u32 parent, u32 handle, |
877 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
878 | { |
879 | int err; | |
1e90474c | 880 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
881 | struct Qdisc *sch; |
882 | struct Qdisc_ops *ops; | |
175f9c1b | 883 | struct qdisc_size_table *stab; |
1da177e4 LT |
884 | |
885 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 886 | #ifdef CONFIG_MODULES |
1da177e4 LT |
887 | if (ops == NULL && kind != NULL) { |
888 | char name[IFNAMSIZ]; | |
1e90474c | 889 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
890 | /* We dropped the RTNL semaphore in order to |
891 | * perform the module load. So, even if we | |
892 | * succeeded in loading the module we have to | |
893 | * tell the caller to replay the request. We | |
894 | * indicate this using -EAGAIN. | |
895 | * We replay the request because the device may | |
896 | * go away in the mean time. | |
897 | */ | |
898 | rtnl_unlock(); | |
899 | request_module("sch_%s", name); | |
900 | rtnl_lock(); | |
901 | ops = qdisc_lookup_ops(kind); | |
902 | if (ops != NULL) { | |
903 | /* We will try again qdisc_lookup_ops, | |
904 | * so don't keep a reference. | |
905 | */ | |
906 | module_put(ops->owner); | |
907 | err = -EAGAIN; | |
908 | goto err_out; | |
909 | } | |
910 | } | |
911 | } | |
912 | #endif | |
913 | ||
b9e2cc0f | 914 | err = -ENOENT; |
1da177e4 LT |
915 | if (ops == NULL) |
916 | goto err_out; | |
917 | ||
5ce2d488 | 918 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
919 | if (IS_ERR(sch)) { |
920 | err = PTR_ERR(sch); | |
1da177e4 | 921 | goto err_out2; |
3d54b82f | 922 | } |
1da177e4 | 923 | |
ffc8fefa PM |
924 | sch->parent = parent; |
925 | ||
3d54b82f | 926 | if (handle == TC_H_INGRESS) { |
1da177e4 | 927 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 928 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 929 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 930 | } else { |
fd44de7c PM |
931 | if (handle == 0) { |
932 | handle = qdisc_alloc_handle(dev); | |
933 | err = -ENOMEM; | |
934 | if (handle == 0) | |
935 | goto err_out3; | |
936 | } | |
25bfcd5a | 937 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1abbe139 ED |
938 | if (!netif_is_multiqueue(dev)) |
939 | sch->flags |= TCQ_F_ONETXQUEUE; | |
1da177e4 LT |
940 | } |
941 | ||
3d54b82f | 942 | sch->handle = handle; |
1da177e4 | 943 | |
1e90474c | 944 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
945 | if (tca[TCA_STAB]) { |
946 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
947 | if (IS_ERR(stab)) { | |
948 | err = PTR_ERR(stab); | |
7c64b9f3 | 949 | goto err_out4; |
175f9c1b | 950 | } |
a2da570d | 951 | rcu_assign_pointer(sch->stab, stab); |
175f9c1b | 952 | } |
1e90474c | 953 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
954 | spinlock_t *root_lock; |
955 | ||
23bcf634 PM |
956 | err = -EOPNOTSUPP; |
957 | if (sch->flags & TCQ_F_MQROOT) | |
958 | goto err_out4; | |
959 | ||
f6f9b93f | 960 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
961 | !(sch->flags & TCQ_F_INGRESS) && |
962 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
f6f9b93f JP |
963 | root_lock = qdisc_root_sleeping_lock(sch); |
964 | else | |
965 | root_lock = qdisc_lock(sch); | |
966 | ||
023e09a7 | 967 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f | 968 | root_lock, tca[TCA_RATE]); |
23bcf634 PM |
969 | if (err) |
970 | goto err_out4; | |
023e09a7 | 971 | } |
f6e0b239 JP |
972 | |
973 | qdisc_list_add(sch); | |
1da177e4 | 974 | |
1da177e4 LT |
975 | return sch; |
976 | } | |
977 | err_out3: | |
978 | dev_put(dev); | |
3d54b82f | 979 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
980 | err_out2: |
981 | module_put(ops->owner); | |
982 | err_out: | |
983 | *errp = err; | |
1da177e4 | 984 | return NULL; |
23bcf634 PM |
985 | |
986 | err_out4: | |
987 | /* | |
988 | * Any broken qdiscs that would require a ops->reset() here? | |
989 | * The qdisc was never in action so it shouldn't be necessary. | |
990 | */ | |
a2da570d | 991 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
992 | if (ops->destroy) |
993 | ops->destroy(sch); | |
994 | goto err_out3; | |
1da177e4 LT |
995 | } |
996 | ||
1e90474c | 997 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 998 | { |
a2da570d | 999 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 1000 | int err = 0; |
1da177e4 | 1001 | |
175f9c1b | 1002 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
1003 | if (sch->ops->change == NULL) |
1004 | return -EINVAL; | |
1e90474c | 1005 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
1006 | if (err) |
1007 | return err; | |
1008 | } | |
175f9c1b JK |
1009 | |
1010 | if (tca[TCA_STAB]) { | |
1011 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
1012 | if (IS_ERR(stab)) | |
1013 | return PTR_ERR(stab); | |
1014 | } | |
1015 | ||
a2da570d ED |
1016 | ostab = rtnl_dereference(sch->stab); |
1017 | rcu_assign_pointer(sch->stab, stab); | |
1018 | qdisc_put_stab(ostab); | |
175f9c1b | 1019 | |
23bcf634 | 1020 | if (tca[TCA_RATE]) { |
71bcb09a SH |
1021 | /* NB: ignores errors from replace_estimator |
1022 | because change can't be undone. */ | |
23bcf634 PM |
1023 | if (sch->flags & TCQ_F_MQROOT) |
1024 | goto out; | |
1da177e4 | 1025 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
71bcb09a SH |
1026 | qdisc_root_sleeping_lock(sch), |
1027 | tca[TCA_RATE]); | |
23bcf634 PM |
1028 | } |
1029 | out: | |
1da177e4 LT |
1030 | return 0; |
1031 | } | |
1032 | ||
cc7ec456 ED |
1033 | struct check_loop_arg { |
1034 | struct qdisc_walker w; | |
1da177e4 LT |
1035 | struct Qdisc *p; |
1036 | int depth; | |
1037 | }; | |
1038 | ||
1039 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
1040 | ||
1041 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
1042 | { | |
1043 | struct check_loop_arg arg; | |
1044 | ||
1045 | if (q->ops->cl_ops == NULL) | |
1046 | return 0; | |
1047 | ||
1048 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
1049 | arg.w.fn = check_loop_fn; | |
1050 | arg.depth = depth; | |
1051 | arg.p = p; | |
1052 | q->ops->cl_ops->walk(q, &arg.w); | |
1053 | return arg.w.stop ? -ELOOP : 0; | |
1054 | } | |
1055 | ||
1056 | static int | |
1057 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1058 | { | |
1059 | struct Qdisc *leaf; | |
20fea08b | 1060 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1061 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1062 | ||
1063 | leaf = cops->leaf(q, cl); | |
1064 | if (leaf) { | |
1065 | if (leaf == arg->p || arg->depth > 7) | |
1066 | return -ELOOP; | |
1067 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1068 | } | |
1069 | return 0; | |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | * Delete/get qdisc. | |
1074 | */ | |
1075 | ||
661d2967 | 1076 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1077 | { |
3b1e0a65 | 1078 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1079 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1080 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1081 | struct net_device *dev; |
de179c8c | 1082 | u32 clid; |
1da177e4 LT |
1083 | struct Qdisc *q = NULL; |
1084 | struct Qdisc *p = NULL; | |
1085 | int err; | |
1086 | ||
dfc47ef8 EB |
1087 | if ((n->nlmsg_type != RTM_GETQDISC) && !capable(CAP_NET_ADMIN)) |
1088 | return -EPERM; | |
1089 | ||
1e90474c PM |
1090 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1091 | if (err < 0) | |
1092 | return err; | |
1093 | ||
de179c8c H |
1094 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1095 | if (!dev) | |
1096 | return -ENODEV; | |
1097 | ||
1098 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1099 | if (clid) { |
1100 | if (clid != TC_H_ROOT) { | |
1101 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 ED |
1102 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1103 | if (!p) | |
1da177e4 LT |
1104 | return -ENOENT; |
1105 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1106 | } else if (dev_ingress_queue(dev)) { |
1107 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1108 | } |
1da177e4 | 1109 | } else { |
af356afa | 1110 | q = dev->qdisc; |
1da177e4 LT |
1111 | } |
1112 | if (!q) | |
1113 | return -ENOENT; | |
1114 | ||
1115 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
1116 | return -EINVAL; | |
1117 | } else { | |
cc7ec456 ED |
1118 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1119 | if (!q) | |
1da177e4 LT |
1120 | return -ENOENT; |
1121 | } | |
1122 | ||
1e90474c | 1123 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1124 | return -EINVAL; |
1125 | ||
1126 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1127 | if (!clid) | |
1128 | return -EINVAL; | |
1129 | if (q->handle == 0) | |
1130 | return -ENOENT; | |
cc7ec456 ED |
1131 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
1132 | if (err != 0) | |
1da177e4 | 1133 | return err; |
1da177e4 | 1134 | } else { |
7316ae88 | 1135 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1136 | } |
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | /* | |
cc7ec456 | 1141 | * Create/change qdisc. |
1da177e4 LT |
1142 | */ |
1143 | ||
661d2967 | 1144 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1145 | { |
3b1e0a65 | 1146 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1147 | struct tcmsg *tcm; |
1e90474c | 1148 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1149 | struct net_device *dev; |
1150 | u32 clid; | |
1151 | struct Qdisc *q, *p; | |
1152 | int err; | |
1153 | ||
dfc47ef8 EB |
1154 | if (!capable(CAP_NET_ADMIN)) |
1155 | return -EPERM; | |
1156 | ||
1da177e4 LT |
1157 | replay: |
1158 | /* Reinit, just in case something touches this. */ | |
de179c8c H |
1159 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1160 | if (err < 0) | |
1161 | return err; | |
1162 | ||
02ef22ca | 1163 | tcm = nlmsg_data(n); |
1da177e4 LT |
1164 | clid = tcm->tcm_parent; |
1165 | q = p = NULL; | |
1166 | ||
cc7ec456 ED |
1167 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1168 | if (!dev) | |
1da177e4 LT |
1169 | return -ENODEV; |
1170 | ||
1e90474c | 1171 | |
1da177e4 LT |
1172 | if (clid) { |
1173 | if (clid != TC_H_ROOT) { | |
1174 | if (clid != TC_H_INGRESS) { | |
cc7ec456 ED |
1175 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1176 | if (!p) | |
1da177e4 LT |
1177 | return -ENOENT; |
1178 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1179 | } else if (dev_ingress_queue_create(dev)) { |
1180 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1181 | } |
1182 | } else { | |
af356afa | 1183 | q = dev->qdisc; |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | /* It may be default qdisc, ignore it */ | |
1187 | if (q && q->handle == 0) | |
1188 | q = NULL; | |
1189 | ||
1190 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1191 | if (tcm->tcm_handle) { | |
cc7ec456 | 1192 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
1da177e4 LT |
1193 | return -EEXIST; |
1194 | if (TC_H_MIN(tcm->tcm_handle)) | |
1195 | return -EINVAL; | |
cc7ec456 ED |
1196 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1197 | if (!q) | |
1da177e4 | 1198 | goto create_n_graft; |
cc7ec456 | 1199 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1200 | return -EEXIST; |
1e90474c | 1201 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1202 | return -EINVAL; |
1203 | if (q == p || | |
1204 | (p && check_loop(q, p, 0))) | |
1205 | return -ELOOP; | |
1206 | atomic_inc(&q->refcnt); | |
1207 | goto graft; | |
1208 | } else { | |
cc7ec456 | 1209 | if (!q) |
1da177e4 LT |
1210 | goto create_n_graft; |
1211 | ||
1212 | /* This magic test requires explanation. | |
1213 | * | |
1214 | * We know, that some child q is already | |
1215 | * attached to this parent and have choice: | |
1216 | * either to change it or to create/graft new one. | |
1217 | * | |
1218 | * 1. We are allowed to create/graft only | |
1219 | * if CREATE and REPLACE flags are set. | |
1220 | * | |
1221 | * 2. If EXCL is set, requestor wanted to say, | |
1222 | * that qdisc tcm_handle is not expected | |
1223 | * to exist, so that we choose create/graft too. | |
1224 | * | |
1225 | * 3. The last case is when no flags are set. | |
1226 | * Alas, it is sort of hole in API, we | |
1227 | * cannot decide what to do unambiguously. | |
1228 | * For now we select create/graft, if | |
1229 | * user gave KIND, which does not match existing. | |
1230 | */ | |
cc7ec456 ED |
1231 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1232 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1233 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1234 | (tca[TCA_KIND] && |
1235 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1236 | goto create_n_graft; |
1237 | } | |
1238 | } | |
1239 | } else { | |
1240 | if (!tcm->tcm_handle) | |
1241 | return -EINVAL; | |
1242 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1243 | } | |
1244 | ||
1245 | /* Change qdisc parameters */ | |
1246 | if (q == NULL) | |
1247 | return -ENOENT; | |
cc7ec456 | 1248 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1249 | return -EEXIST; |
1e90474c | 1250 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1251 | return -EINVAL; |
1252 | err = qdisc_change(q, tca); | |
1253 | if (err == 0) | |
7316ae88 | 1254 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1255 | return err; |
1256 | ||
1257 | create_n_graft: | |
cc7ec456 | 1258 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
1da177e4 | 1259 | return -ENOENT; |
24824a09 ED |
1260 | if (clid == TC_H_INGRESS) { |
1261 | if (dev_ingress_queue(dev)) | |
1262 | q = qdisc_create(dev, dev_ingress_queue(dev), p, | |
1263 | tcm->tcm_parent, tcm->tcm_parent, | |
1264 | tca, &err); | |
1265 | else | |
1266 | err = -ENOENT; | |
1267 | } else { | |
926e61b7 | 1268 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1269 | |
1270 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1271 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1272 | else if (p) | |
1273 | dev_queue = p->dev_queue; | |
1274 | else | |
1275 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1276 | |
926e61b7 | 1277 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1278 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1279 | tca, &err); |
6ec1c69a | 1280 | } |
1da177e4 LT |
1281 | if (q == NULL) { |
1282 | if (err == -EAGAIN) | |
1283 | goto replay; | |
1284 | return err; | |
1285 | } | |
1286 | ||
1287 | graft: | |
e5befbd9 IJ |
1288 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1289 | if (err) { | |
1290 | if (q) | |
1291 | qdisc_destroy(q); | |
1292 | return err; | |
1da177e4 | 1293 | } |
e5befbd9 | 1294 | |
1da177e4 LT |
1295 | return 0; |
1296 | } | |
1297 | ||
1298 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
15e47304 | 1299 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1300 | { |
1301 | struct tcmsg *tcm; | |
1302 | struct nlmsghdr *nlh; | |
27a884dc | 1303 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1304 | struct gnet_dump d; |
a2da570d | 1305 | struct qdisc_size_table *stab; |
1da177e4 | 1306 | |
fba373d2 | 1307 | cond_resched(); |
15e47304 | 1308 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1309 | if (!nlh) |
1310 | goto out_nlmsg_trim; | |
1311 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1312 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 PM |
1313 | tcm->tcm__pad1 = 0; |
1314 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1315 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1316 | tcm->tcm_parent = clid; |
1317 | tcm->tcm_handle = q->handle; | |
1318 | tcm->tcm_info = atomic_read(&q->refcnt); | |
1b34ec43 DM |
1319 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1320 | goto nla_put_failure; | |
1da177e4 | 1321 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1322 | goto nla_put_failure; |
1da177e4 LT |
1323 | q->qstats.qlen = q->q.qlen; |
1324 | ||
a2da570d ED |
1325 | stab = rtnl_dereference(q->stab); |
1326 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
175f9c1b JK |
1327 | goto nla_put_failure; |
1328 | ||
102396ae JP |
1329 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1330 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1331 | goto nla_put_failure; |
1da177e4 LT |
1332 | |
1333 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1334 | goto nla_put_failure; |
1da177e4 LT |
1335 | |
1336 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
d250a5f9 | 1337 | gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || |
1da177e4 | 1338 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1339 | goto nla_put_failure; |
10297b99 | 1340 | |
1da177e4 | 1341 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1342 | goto nla_put_failure; |
10297b99 | 1343 | |
27a884dc | 1344 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1345 | return skb->len; |
1346 | ||
02ef22ca | 1347 | out_nlmsg_trim: |
1e90474c | 1348 | nla_put_failure: |
dc5fc579 | 1349 | nlmsg_trim(skb, b); |
1da177e4 LT |
1350 | return -1; |
1351 | } | |
1352 | ||
53b0f080 ED |
1353 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1354 | { | |
1355 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1356 | } | |
1357 | ||
7316ae88 TG |
1358 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1359 | struct nlmsghdr *n, u32 clid, | |
1360 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1361 | { |
1362 | struct sk_buff *skb; | |
15e47304 | 1363 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1364 | |
1365 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1366 | if (!skb) | |
1367 | return -ENOBUFS; | |
1368 | ||
53b0f080 | 1369 | if (old && !tc_qdisc_dump_ignore(old)) { |
15e47304 | 1370 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1371 | 0, RTM_DELQDISC) < 0) |
1da177e4 LT |
1372 | goto err_out; |
1373 | } | |
53b0f080 | 1374 | if (new && !tc_qdisc_dump_ignore(new)) { |
15e47304 | 1375 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1376 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
1da177e4 LT |
1377 | goto err_out; |
1378 | } | |
1379 | ||
1380 | if (skb->len) | |
15e47304 | 1381 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1382 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1383 | |
1384 | err_out: | |
1385 | kfree_skb(skb); | |
1386 | return -EINVAL; | |
1387 | } | |
1388 | ||
30723673 DM |
1389 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1390 | struct netlink_callback *cb, | |
1391 | int *q_idx_p, int s_q_idx) | |
1392 | { | |
1393 | int ret = 0, q_idx = *q_idx_p; | |
1394 | struct Qdisc *q; | |
1395 | ||
1396 | if (!root) | |
1397 | return 0; | |
1398 | ||
1399 | q = root; | |
1400 | if (q_idx < s_q_idx) { | |
1401 | q_idx++; | |
1402 | } else { | |
1403 | if (!tc_qdisc_dump_ignore(q) && | |
15e47304 | 1404 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1405 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1406 | goto done; | |
1407 | q_idx++; | |
1408 | } | |
1409 | list_for_each_entry(q, &root->list, list) { | |
1410 | if (q_idx < s_q_idx) { | |
1411 | q_idx++; | |
1412 | continue; | |
1413 | } | |
cc7ec456 | 1414 | if (!tc_qdisc_dump_ignore(q) && |
15e47304 | 1415 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1416 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1417 | goto done; | |
1418 | q_idx++; | |
1419 | } | |
1420 | ||
1421 | out: | |
1422 | *q_idx_p = q_idx; | |
1423 | return ret; | |
1424 | done: | |
1425 | ret = -1; | |
1426 | goto out; | |
1427 | } | |
1428 | ||
1da177e4 LT |
1429 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1430 | { | |
3b1e0a65 | 1431 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1432 | int idx, q_idx; |
1433 | int s_idx, s_q_idx; | |
1434 | struct net_device *dev; | |
1da177e4 LT |
1435 | |
1436 | s_idx = cb->args[0]; | |
1437 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1438 | |
7562f876 | 1439 | idx = 0; |
15dc36eb ED |
1440 | ASSERT_RTNL(); |
1441 | for_each_netdev(net, dev) { | |
30723673 DM |
1442 | struct netdev_queue *dev_queue; |
1443 | ||
1da177e4 | 1444 | if (idx < s_idx) |
7562f876 | 1445 | goto cont; |
1da177e4 LT |
1446 | if (idx > s_idx) |
1447 | s_q_idx = 0; | |
1da177e4 | 1448 | q_idx = 0; |
30723673 | 1449 | |
af356afa | 1450 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1451 | goto done; |
1452 | ||
24824a09 ED |
1453 | dev_queue = dev_ingress_queue(dev); |
1454 | if (dev_queue && | |
1455 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
1456 | &q_idx, s_q_idx) < 0) | |
30723673 DM |
1457 | goto done; |
1458 | ||
7562f876 PE |
1459 | cont: |
1460 | idx++; | |
1da177e4 LT |
1461 | } |
1462 | ||
1463 | done: | |
1da177e4 LT |
1464 | cb->args[0] = idx; |
1465 | cb->args[1] = q_idx; | |
1466 | ||
1467 | return skb->len; | |
1468 | } | |
1469 | ||
1470 | ||
1471 | ||
1472 | /************************************************ | |
1473 | * Traffic classes manipulation. * | |
1474 | ************************************************/ | |
1475 | ||
1476 | ||
1477 | ||
661d2967 | 1478 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1479 | { |
3b1e0a65 | 1480 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1481 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1482 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1483 | struct net_device *dev; |
1484 | struct Qdisc *q = NULL; | |
20fea08b | 1485 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1486 | unsigned long cl = 0; |
1487 | unsigned long new_cl; | |
de179c8c H |
1488 | u32 portid; |
1489 | u32 clid; | |
1490 | u32 qid; | |
1da177e4 LT |
1491 | int err; |
1492 | ||
dfc47ef8 EB |
1493 | if ((n->nlmsg_type != RTM_GETTCLASS) && !capable(CAP_NET_ADMIN)) |
1494 | return -EPERM; | |
1495 | ||
1e90474c PM |
1496 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1497 | if (err < 0) | |
1498 | return err; | |
1499 | ||
de179c8c H |
1500 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1501 | if (!dev) | |
1502 | return -ENODEV; | |
1503 | ||
1da177e4 LT |
1504 | /* |
1505 | parent == TC_H_UNSPEC - unspecified parent. | |
1506 | parent == TC_H_ROOT - class is root, which has no parent. | |
1507 | parent == X:0 - parent is root class. | |
1508 | parent == X:Y - parent is a node in hierarchy. | |
1509 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1510 | ||
1511 | handle == 0:0 - generate handle from kernel pool. | |
1512 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1513 | handle == X:Y - clear. | |
1514 | handle == X:0 - root class. | |
1515 | */ | |
1516 | ||
1517 | /* Step 1. Determine qdisc handle X:0 */ | |
1518 | ||
de179c8c H |
1519 | portid = tcm->tcm_parent; |
1520 | clid = tcm->tcm_handle; | |
1521 | qid = TC_H_MAJ(clid); | |
1522 | ||
15e47304 EB |
1523 | if (portid != TC_H_ROOT) { |
1524 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
1525 | |
1526 | if (qid && qid1) { | |
1527 | /* If both majors are known, they must be identical. */ | |
1528 | if (qid != qid1) | |
1529 | return -EINVAL; | |
1530 | } else if (qid1) { | |
1531 | qid = qid1; | |
1532 | } else if (qid == 0) | |
af356afa | 1533 | qid = dev->qdisc->handle; |
1da177e4 LT |
1534 | |
1535 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1536 | * both with parent and child. |
1537 | * | |
15e47304 | 1538 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 1539 | */ |
15e47304 EB |
1540 | if (portid) |
1541 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
1542 | } else { |
1543 | if (qid == 0) | |
af356afa | 1544 | qid = dev->qdisc->handle; |
1da177e4 LT |
1545 | } |
1546 | ||
1547 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1548 | q = qdisc_lookup(dev, qid); |
1549 | if (!q) | |
1da177e4 LT |
1550 | return -ENOENT; |
1551 | ||
1552 | /* An check that it supports classes */ | |
1553 | cops = q->ops->cl_ops; | |
1554 | if (cops == NULL) | |
1555 | return -EINVAL; | |
1556 | ||
1557 | /* Now try to get class */ | |
1558 | if (clid == 0) { | |
15e47304 | 1559 | if (portid == TC_H_ROOT) |
1da177e4 LT |
1560 | clid = qid; |
1561 | } else | |
1562 | clid = TC_H_MAKE(qid, clid); | |
1563 | ||
1564 | if (clid) | |
1565 | cl = cops->get(q, clid); | |
1566 | ||
1567 | if (cl == 0) { | |
1568 | err = -ENOENT; | |
cc7ec456 ED |
1569 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1570 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1571 | goto out; |
1572 | } else { | |
1573 | switch (n->nlmsg_type) { | |
10297b99 | 1574 | case RTM_NEWTCLASS: |
1da177e4 | 1575 | err = -EEXIST; |
cc7ec456 | 1576 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1577 | goto out; |
1578 | break; | |
1579 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1580 | err = -EOPNOTSUPP; |
1581 | if (cops->delete) | |
1582 | err = cops->delete(q, cl); | |
1da177e4 | 1583 | if (err == 0) |
7316ae88 | 1584 | tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); |
1da177e4 LT |
1585 | goto out; |
1586 | case RTM_GETTCLASS: | |
7316ae88 | 1587 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1588 | goto out; |
1589 | default: | |
1590 | err = -EINVAL; | |
1591 | goto out; | |
1592 | } | |
1593 | } | |
1594 | ||
1595 | new_cl = cl; | |
de6d5cdf PM |
1596 | err = -EOPNOTSUPP; |
1597 | if (cops->change) | |
15e47304 | 1598 | err = cops->change(q, clid, portid, tca, &new_cl); |
1da177e4 | 1599 | if (err == 0) |
7316ae88 | 1600 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1601 | |
1602 | out: | |
1603 | if (cl) | |
1604 | cops->put(q, cl); | |
1605 | ||
1606 | return err; | |
1607 | } | |
1608 | ||
1609 | ||
1610 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1611 | unsigned long cl, | |
15e47304 | 1612 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1613 | { |
1614 | struct tcmsg *tcm; | |
1615 | struct nlmsghdr *nlh; | |
27a884dc | 1616 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1617 | struct gnet_dump d; |
20fea08b | 1618 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1619 | |
fba373d2 | 1620 | cond_resched(); |
15e47304 | 1621 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1622 | if (!nlh) |
1623 | goto out_nlmsg_trim; | |
1624 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1625 | tcm->tcm_family = AF_UNSPEC; |
16ebb5e0 ED |
1626 | tcm->tcm__pad1 = 0; |
1627 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1628 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1629 | tcm->tcm_parent = q->handle; |
1630 | tcm->tcm_handle = q->handle; | |
1631 | tcm->tcm_info = 0; | |
1b34ec43 DM |
1632 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1633 | goto nla_put_failure; | |
1da177e4 | 1634 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1635 | goto nla_put_failure; |
1da177e4 | 1636 | |
102396ae JP |
1637 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1638 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1639 | goto nla_put_failure; |
1da177e4 LT |
1640 | |
1641 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1642 | goto nla_put_failure; |
1da177e4 LT |
1643 | |
1644 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1645 | goto nla_put_failure; |
1da177e4 | 1646 | |
27a884dc | 1647 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1648 | return skb->len; |
1649 | ||
02ef22ca | 1650 | out_nlmsg_trim: |
1e90474c | 1651 | nla_put_failure: |
dc5fc579 | 1652 | nlmsg_trim(skb, b); |
1da177e4 LT |
1653 | return -1; |
1654 | } | |
1655 | ||
7316ae88 TG |
1656 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1657 | struct nlmsghdr *n, struct Qdisc *q, | |
1658 | unsigned long cl, int event) | |
1da177e4 LT |
1659 | { |
1660 | struct sk_buff *skb; | |
15e47304 | 1661 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1662 | |
1663 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1664 | if (!skb) | |
1665 | return -ENOBUFS; | |
1666 | ||
15e47304 | 1667 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { |
1da177e4 LT |
1668 | kfree_skb(skb); |
1669 | return -EINVAL; | |
1670 | } | |
1671 | ||
15e47304 | 1672 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1673 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1674 | } |
1675 | ||
cc7ec456 ED |
1676 | struct qdisc_dump_args { |
1677 | struct qdisc_walker w; | |
1678 | struct sk_buff *skb; | |
1679 | struct netlink_callback *cb; | |
1da177e4 LT |
1680 | }; |
1681 | ||
1682 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1683 | { | |
1684 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1685 | ||
15e47304 | 1686 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
1da177e4 LT |
1687 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); |
1688 | } | |
1689 | ||
30723673 DM |
1690 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1691 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1692 | int *t_p, int s_t) | |
1693 | { | |
1694 | struct qdisc_dump_args arg; | |
1695 | ||
1696 | if (tc_qdisc_dump_ignore(q) || | |
1697 | *t_p < s_t || !q->ops->cl_ops || | |
1698 | (tcm->tcm_parent && | |
1699 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1700 | (*t_p)++; | |
1701 | return 0; | |
1702 | } | |
1703 | if (*t_p > s_t) | |
1704 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1705 | arg.w.fn = qdisc_class_dump; | |
1706 | arg.skb = skb; | |
1707 | arg.cb = cb; | |
1708 | arg.w.stop = 0; | |
1709 | arg.w.skip = cb->args[1]; | |
1710 | arg.w.count = 0; | |
1711 | q->ops->cl_ops->walk(q, &arg.w); | |
1712 | cb->args[1] = arg.w.count; | |
1713 | if (arg.w.stop) | |
1714 | return -1; | |
1715 | (*t_p)++; | |
1716 | return 0; | |
1717 | } | |
1718 | ||
1719 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1720 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1721 | int *t_p, int s_t) | |
1722 | { | |
1723 | struct Qdisc *q; | |
1724 | ||
1725 | if (!root) | |
1726 | return 0; | |
1727 | ||
1728 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1729 | return -1; | |
1730 | ||
1731 | list_for_each_entry(q, &root->list, list) { | |
1732 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1733 | return -1; | |
1734 | } | |
1735 | ||
1736 | return 0; | |
1737 | } | |
1738 | ||
1da177e4 LT |
1739 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1740 | { | |
02ef22ca | 1741 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 1742 | struct net *net = sock_net(skb->sk); |
30723673 | 1743 | struct netdev_queue *dev_queue; |
1da177e4 | 1744 | struct net_device *dev; |
30723673 | 1745 | int t, s_t; |
1da177e4 | 1746 | |
573ce260 | 1747 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1748 | return 0; |
cc7ec456 ED |
1749 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
1750 | if (!dev) | |
1da177e4 LT |
1751 | return 0; |
1752 | ||
1753 | s_t = cb->args[0]; | |
1754 | t = 0; | |
1755 | ||
af356afa | 1756 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1757 | goto done; |
1758 | ||
24824a09 ED |
1759 | dev_queue = dev_ingress_queue(dev); |
1760 | if (dev_queue && | |
1761 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
1762 | &t, s_t) < 0) | |
30723673 | 1763 | goto done; |
1da177e4 | 1764 | |
30723673 | 1765 | done: |
1da177e4 LT |
1766 | cb->args[0] = t; |
1767 | ||
1768 | dev_put(dev); | |
1769 | return skb->len; | |
1770 | } | |
1771 | ||
1772 | /* Main classifier routine: scans classifier chain attached | |
cc7ec456 ED |
1773 | * to this qdisc, (optionally) tests for protocol and asks |
1774 | * specific classifiers. | |
1da177e4 | 1775 | */ |
dc7f9f6e | 1776 | int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp, |
73ca4918 PM |
1777 | struct tcf_result *res) |
1778 | { | |
1779 | __be16 protocol = skb->protocol; | |
cc7ec456 | 1780 | int err; |
73ca4918 PM |
1781 | |
1782 | for (; tp; tp = tp->next) { | |
cc7ec456 ED |
1783 | if (tp->protocol != protocol && |
1784 | tp->protocol != htons(ETH_P_ALL)) | |
1785 | continue; | |
1786 | err = tp->classify(skb, tp, res); | |
1787 | ||
1788 | if (err >= 0) { | |
73ca4918 PM |
1789 | #ifdef CONFIG_NET_CLS_ACT |
1790 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1791 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1792 | #endif | |
1793 | return err; | |
1794 | } | |
1795 | } | |
1796 | return -1; | |
1797 | } | |
1798 | EXPORT_SYMBOL(tc_classify_compat); | |
1799 | ||
dc7f9f6e | 1800 | int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
73ca4918 | 1801 | struct tcf_result *res) |
1da177e4 LT |
1802 | { |
1803 | int err = 0; | |
1da177e4 | 1804 | #ifdef CONFIG_NET_CLS_ACT |
dc7f9f6e | 1805 | const struct tcf_proto *otp = tp; |
1da177e4 | 1806 | reclassify: |
52bc9747 | 1807 | #endif |
1da177e4 | 1808 | |
73ca4918 | 1809 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1810 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1811 | if (err == TC_ACT_RECLASSIFY) { |
1812 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1813 | tp = otp; | |
1814 | ||
1815 | if (verd++ >= MAX_REC_LOOP) { | |
e87cc472 JP |
1816 | net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n", |
1817 | tp->q->ops->id, | |
1818 | tp->prio & 0xffff, | |
1819 | ntohs(tp->protocol)); | |
73ca4918 | 1820 | return TC_ACT_SHOT; |
1da177e4 | 1821 | } |
73ca4918 PM |
1822 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1823 | goto reclassify; | |
1da177e4 | 1824 | } |
73ca4918 PM |
1825 | #endif |
1826 | return err; | |
1da177e4 | 1827 | } |
73ca4918 | 1828 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1829 | |
a48b5a61 PM |
1830 | void tcf_destroy(struct tcf_proto *tp) |
1831 | { | |
1832 | tp->ops->destroy(tp); | |
1833 | module_put(tp->ops->owner); | |
1834 | kfree(tp); | |
1835 | } | |
1836 | ||
ff31ab56 | 1837 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1838 | { |
1839 | struct tcf_proto *tp; | |
1840 | ||
ff31ab56 PM |
1841 | while ((tp = *fl) != NULL) { |
1842 | *fl = tp->next; | |
a48b5a61 PM |
1843 | tcf_destroy(tp); |
1844 | } | |
1845 | } | |
1846 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1847 | ||
1da177e4 LT |
1848 | #ifdef CONFIG_PROC_FS |
1849 | static int psched_show(struct seq_file *seq, void *v) | |
1850 | { | |
3c0cfc13 PM |
1851 | struct timespec ts; |
1852 | ||
1853 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1854 | seq_printf(seq, "%08x %08x %08x %08x\n", |
ca44d6e6 | 1855 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1856 | 1000000, |
3c0cfc13 | 1857 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1858 | |
1859 | return 0; | |
1860 | } | |
1861 | ||
1862 | static int psched_open(struct inode *inode, struct file *file) | |
1863 | { | |
7e5ab157 | 1864 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1865 | } |
1866 | ||
da7071d7 | 1867 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1868 | .owner = THIS_MODULE, |
1869 | .open = psched_open, | |
1870 | .read = seq_read, | |
1871 | .llseek = seq_lseek, | |
1872 | .release = single_release, | |
10297b99 | 1873 | }; |
7316ae88 TG |
1874 | |
1875 | static int __net_init psched_net_init(struct net *net) | |
1876 | { | |
1877 | struct proc_dir_entry *e; | |
1878 | ||
d4beaa66 | 1879 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
7316ae88 TG |
1880 | if (e == NULL) |
1881 | return -ENOMEM; | |
1882 | ||
1883 | return 0; | |
1884 | } | |
1885 | ||
1886 | static void __net_exit psched_net_exit(struct net *net) | |
1887 | { | |
ece31ffd | 1888 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
1889 | } |
1890 | #else | |
1891 | static int __net_init psched_net_init(struct net *net) | |
1892 | { | |
1893 | return 0; | |
1894 | } | |
1895 | ||
1896 | static void __net_exit psched_net_exit(struct net *net) | |
1897 | { | |
1898 | } | |
1da177e4 LT |
1899 | #endif |
1900 | ||
7316ae88 TG |
1901 | static struct pernet_operations psched_net_ops = { |
1902 | .init = psched_net_init, | |
1903 | .exit = psched_net_exit, | |
1904 | }; | |
1905 | ||
1da177e4 LT |
1906 | static int __init pktsched_init(void) |
1907 | { | |
7316ae88 TG |
1908 | int err; |
1909 | ||
1910 | err = register_pernet_subsys(&psched_net_ops); | |
1911 | if (err) { | |
cc7ec456 | 1912 | pr_err("pktsched_init: " |
7316ae88 TG |
1913 | "cannot initialize per netns operations\n"); |
1914 | return err; | |
1915 | } | |
1916 | ||
6da7c8fc | 1917 | register_qdisc(&pfifo_fast_ops); |
1da177e4 LT |
1918 | register_qdisc(&pfifo_qdisc_ops); |
1919 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1920 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1921 | register_qdisc(&mq_qdisc_ops); |
1da177e4 | 1922 | |
c7ac8679 GR |
1923 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL); |
1924 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL); | |
1925 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL); | |
1926 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL); | |
1927 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL); | |
1928 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL); | |
be577ddc | 1929 | |
1da177e4 LT |
1930 | return 0; |
1931 | } | |
1932 | ||
1933 | subsys_initcall(pktsched_init); |