Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_api.c Packet scheduler API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Fixes: | |
12 | * | |
13 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. | |
14 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support | |
15 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
1da177e4 | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/errno.h> |
1da177e4 | 23 | #include <linux/skbuff.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/proc_fs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/list.h> | |
4179477f | 29 | #include <linux/hrtimer.h> |
25bfcd5a | 30 | #include <linux/lockdep.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
1da177e4 | 32 | |
457c4cbc | 33 | #include <net/net_namespace.h> |
b854272b | 34 | #include <net/sock.h> |
dc5fc579 | 35 | #include <net/netlink.h> |
1da177e4 LT |
36 | #include <net/pkt_sched.h> |
37 | ||
7316ae88 TG |
38 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
39 | struct nlmsghdr *n, u32 clid, | |
1da177e4 | 40 | struct Qdisc *old, struct Qdisc *new); |
7316ae88 TG |
41 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
42 | struct nlmsghdr *n, struct Qdisc *q, | |
43 | unsigned long cl, int event); | |
1da177e4 LT |
44 | |
45 | /* | |
46 | ||
47 | Short review. | |
48 | ------------- | |
49 | ||
50 | This file consists of two interrelated parts: | |
51 | ||
52 | 1. queueing disciplines manager frontend. | |
53 | 2. traffic classes manager frontend. | |
54 | ||
55 | Generally, queueing discipline ("qdisc") is a black box, | |
56 | which is able to enqueue packets and to dequeue them (when | |
57 | device is ready to send something) in order and at times | |
58 | determined by algorithm hidden in it. | |
59 | ||
60 | qdisc's are divided to two categories: | |
61 | - "queues", which have no internal structure visible from outside. | |
62 | - "schedulers", which split all the packets to "traffic classes", | |
63 | using "packet classifiers" (look at cls_api.c) | |
64 | ||
65 | In turn, classes may have child qdiscs (as rule, queues) | |
66 | attached to them etc. etc. etc. | |
67 | ||
68 | The goal of the routines in this file is to translate | |
69 | information supplied by user in the form of handles | |
70 | to more intelligible for kernel form, to make some sanity | |
71 | checks and part of work, which is common to all qdiscs | |
72 | and to provide rtnetlink notifications. | |
73 | ||
74 | All real intelligent work is done inside qdisc modules. | |
75 | ||
76 | ||
77 | ||
78 | Every discipline has two major routines: enqueue and dequeue. | |
79 | ||
80 | ---dequeue | |
81 | ||
82 | dequeue usually returns a skb to send. It is allowed to return NULL, | |
83 | but it does not mean that queue is empty, it just means that | |
84 | discipline does not want to send anything this time. | |
85 | Queue is really empty if q->q.qlen == 0. | |
86 | For complicated disciplines with multiple queues q->q is not | |
87 | real packet queue, but however q->q.qlen must be valid. | |
88 | ||
89 | ---enqueue | |
90 | ||
91 | enqueue returns 0, if packet was enqueued successfully. | |
92 | If packet (this one or another one) was dropped, it returns | |
93 | not zero error code. | |
94 | NET_XMIT_DROP - this packet dropped | |
95 | Expected action: do not backoff, but wait until queue will clear. | |
96 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. | |
97 | Expected action: backoff or ignore | |
98 | NET_XMIT_POLICED - dropped by police. | |
99 | Expected action: backoff or error to real-time apps. | |
100 | ||
101 | Auxiliary routines: | |
102 | ||
99c0db26 JP |
103 | ---peek |
104 | ||
105 | like dequeue but without removing a packet from the queue | |
106 | ||
1da177e4 LT |
107 | ---reset |
108 | ||
109 | returns qdisc to initial state: purge all buffers, clear all | |
110 | timers, counters (except for statistics) etc. | |
111 | ||
112 | ---init | |
113 | ||
114 | initializes newly created qdisc. | |
115 | ||
116 | ---destroy | |
117 | ||
118 | destroys resources allocated by init and during lifetime of qdisc. | |
119 | ||
120 | ---change | |
121 | ||
122 | changes qdisc parameters. | |
123 | */ | |
124 | ||
125 | /* Protects list of registered TC modules. It is pure SMP lock. */ | |
126 | static DEFINE_RWLOCK(qdisc_mod_lock); | |
127 | ||
128 | ||
129 | /************************************************ | |
130 | * Queueing disciplines manipulation. * | |
131 | ************************************************/ | |
132 | ||
133 | ||
134 | /* The list of all installed queueing disciplines. */ | |
135 | ||
136 | static struct Qdisc_ops *qdisc_base; | |
137 | ||
138 | /* Register/uregister queueing discipline */ | |
139 | ||
140 | int register_qdisc(struct Qdisc_ops *qops) | |
141 | { | |
142 | struct Qdisc_ops *q, **qp; | |
143 | int rc = -EEXIST; | |
144 | ||
145 | write_lock(&qdisc_mod_lock); | |
146 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) | |
147 | if (!strcmp(qops->id, q->id)) | |
148 | goto out; | |
149 | ||
150 | if (qops->enqueue == NULL) | |
151 | qops->enqueue = noop_qdisc_ops.enqueue; | |
99c0db26 | 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 LT |
202 | |
203 | /* We know handle. Find qdisc among all qdisc's attached to device | |
204 | (root qdisc, all its children, children of children etc.) | |
205 | */ | |
206 | ||
6113b748 | 207 | static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
8123b421 DM |
208 | { |
209 | struct Qdisc *q; | |
210 | ||
211 | if (!(root->flags & TCQ_F_BUILTIN) && | |
212 | root->handle == handle) | |
213 | return root; | |
214 | ||
215 | list_for_each_entry(q, &root->list, list) { | |
216 | if (q->handle == handle) | |
217 | return q; | |
218 | } | |
219 | return NULL; | |
220 | } | |
221 | ||
f6e0b239 JP |
222 | static void qdisc_list_add(struct Qdisc *q) |
223 | { | |
f6486d40 | 224 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
af356afa | 225 | list_add_tail(&q->list, &qdisc_dev(q)->qdisc->list); |
f6e0b239 JP |
226 | } |
227 | ||
228 | void qdisc_list_del(struct Qdisc *q) | |
229 | { | |
f6486d40 | 230 | if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) |
f6e0b239 | 231 | list_del(&q->list); |
f6e0b239 JP |
232 | } |
233 | EXPORT_SYMBOL(qdisc_list_del); | |
234 | ||
ead81cc5 | 235 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
1da177e4 | 236 | { |
f6e0b239 JP |
237 | struct Qdisc *q; |
238 | ||
af356afa PM |
239 | q = qdisc_match_from_root(dev->qdisc, handle); |
240 | if (q) | |
241 | goto out; | |
f6e0b239 | 242 | |
24824a09 ED |
243 | if (dev_ingress_queue(dev)) |
244 | q = qdisc_match_from_root( | |
245 | dev_ingress_queue(dev)->qdisc_sleeping, | |
246 | handle); | |
f6486d40 | 247 | out: |
f6e0b239 | 248 | return q; |
1da177e4 LT |
249 | } |
250 | ||
251 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) | |
252 | { | |
253 | unsigned long cl; | |
254 | struct Qdisc *leaf; | |
20fea08b | 255 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
1da177e4 LT |
256 | |
257 | if (cops == NULL) | |
258 | return NULL; | |
259 | cl = cops->get(p, classid); | |
260 | ||
261 | if (cl == 0) | |
262 | return NULL; | |
263 | leaf = cops->leaf(p, cl); | |
264 | cops->put(p, cl); | |
265 | return leaf; | |
266 | } | |
267 | ||
268 | /* Find queueing discipline by name */ | |
269 | ||
1e90474c | 270 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
1da177e4 LT |
271 | { |
272 | struct Qdisc_ops *q = NULL; | |
273 | ||
274 | if (kind) { | |
275 | read_lock(&qdisc_mod_lock); | |
276 | for (q = qdisc_base; q; q = q->next) { | |
1e90474c | 277 | if (nla_strcmp(kind, q->id) == 0) { |
1da177e4 LT |
278 | if (!try_module_get(q->owner)) |
279 | q = NULL; | |
280 | break; | |
281 | } | |
282 | } | |
283 | read_unlock(&qdisc_mod_lock); | |
284 | } | |
285 | return q; | |
286 | } | |
287 | ||
c06ab091 JDB |
288 | /* The linklayer setting were not transferred from iproute2, in older |
289 | * versions, and the rate tables lookup systems have been dropped in | |
290 | * the kernel. To keep backward compatible with older iproute2 tc | |
291 | * utils, we detect the linklayer setting by detecting if the rate | |
292 | * table were modified. | |
293 | * | |
294 | * For linklayer ATM table entries, the rate table will be aligned to | |
295 | * 48 bytes, thus some table entries will contain the same value. The | |
296 | * mpu (min packet unit) is also encoded into the old rate table, thus | |
297 | * starting from the mpu, we find low and high table entries for | |
298 | * mapping this cell. If these entries contain the same value, when | |
299 | * the rate tables have been modified for linklayer ATM. | |
300 | * | |
301 | * This is done by rounding mpu to the nearest 48 bytes cell/entry, | |
302 | * and then roundup to the next cell, calc the table entry one below, | |
303 | * and compare. | |
304 | */ | |
305 | static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) | |
306 | { | |
307 | int low = roundup(r->mpu, 48); | |
308 | int high = roundup(low+1, 48); | |
309 | int cell_low = low >> r->cell_log; | |
310 | int cell_high = (high >> r->cell_log) - 1; | |
311 | ||
312 | /* rtab is too inaccurate at rates > 100Mbit/s */ | |
313 | if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { | |
314 | pr_debug("TC linklayer: Giving up ATM detection\n"); | |
315 | return TC_LINKLAYER_ETHERNET; | |
316 | } | |
317 | ||
318 | if ((cell_high > cell_low) && (cell_high < 256) | |
319 | && (rtab[cell_low] == rtab[cell_high])) { | |
320 | pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", | |
321 | cell_low, cell_high, rtab[cell_high]); | |
322 | return TC_LINKLAYER_ATM; | |
323 | } | |
324 | return TC_LINKLAYER_ETHERNET; | |
325 | } | |
326 | ||
1da177e4 LT |
327 | static struct qdisc_rate_table *qdisc_rtab_list; |
328 | ||
1e90474c | 329 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
1da177e4 LT |
330 | { |
331 | struct qdisc_rate_table *rtab; | |
332 | ||
40edeff6 ED |
333 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
334 | nla_len(tab) != TC_RTAB_SIZE) | |
335 | return NULL; | |
336 | ||
1da177e4 | 337 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
40edeff6 ED |
338 | if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
339 | !memcmp(&rtab->data, nla_data(tab), 1024)) { | |
1da177e4 LT |
340 | rtab->refcnt++; |
341 | return rtab; | |
342 | } | |
343 | } | |
344 | ||
1da177e4 LT |
345 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
346 | if (rtab) { | |
347 | rtab->rate = *r; | |
348 | rtab->refcnt = 1; | |
1e90474c | 349 | memcpy(rtab->data, nla_data(tab), 1024); |
c06ab091 JDB |
350 | if (r->linklayer == TC_LINKLAYER_UNAWARE) |
351 | r->linklayer = __detect_linklayer(r, rtab->data); | |
1da177e4 LT |
352 | rtab->next = qdisc_rtab_list; |
353 | qdisc_rtab_list = rtab; | |
354 | } | |
355 | return rtab; | |
356 | } | |
62e3ba1b | 357 | EXPORT_SYMBOL(qdisc_get_rtab); |
1da177e4 LT |
358 | |
359 | void qdisc_put_rtab(struct qdisc_rate_table *tab) | |
360 | { | |
361 | struct qdisc_rate_table *rtab, **rtabp; | |
362 | ||
363 | if (!tab || --tab->refcnt) | |
364 | return; | |
365 | ||
cc7ec456 ED |
366 | for (rtabp = &qdisc_rtab_list; |
367 | (rtab = *rtabp) != NULL; | |
368 | rtabp = &rtab->next) { | |
1da177e4 LT |
369 | if (rtab == tab) { |
370 | *rtabp = rtab->next; | |
371 | kfree(rtab); | |
372 | return; | |
373 | } | |
374 | } | |
375 | } | |
62e3ba1b | 376 | EXPORT_SYMBOL(qdisc_put_rtab); |
1da177e4 | 377 | |
175f9c1b JK |
378 | static LIST_HEAD(qdisc_stab_list); |
379 | static DEFINE_SPINLOCK(qdisc_stab_lock); | |
380 | ||
381 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { | |
382 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, | |
383 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, | |
384 | }; | |
385 | ||
386 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) | |
387 | { | |
388 | struct nlattr *tb[TCA_STAB_MAX + 1]; | |
389 | struct qdisc_size_table *stab; | |
390 | struct tc_sizespec *s; | |
391 | unsigned int tsize = 0; | |
392 | u16 *tab = NULL; | |
393 | int err; | |
394 | ||
395 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); | |
396 | if (err < 0) | |
397 | return ERR_PTR(err); | |
398 | if (!tb[TCA_STAB_BASE]) | |
399 | return ERR_PTR(-EINVAL); | |
400 | ||
401 | s = nla_data(tb[TCA_STAB_BASE]); | |
402 | ||
403 | if (s->tsize > 0) { | |
404 | if (!tb[TCA_STAB_DATA]) | |
405 | return ERR_PTR(-EINVAL); | |
406 | tab = nla_data(tb[TCA_STAB_DATA]); | |
407 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); | |
408 | } | |
409 | ||
00093fab | 410 | if (tsize != s->tsize || (!tab && tsize > 0)) |
175f9c1b JK |
411 | return ERR_PTR(-EINVAL); |
412 | ||
f3b9605d | 413 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
414 | |
415 | list_for_each_entry(stab, &qdisc_stab_list, list) { | |
416 | if (memcmp(&stab->szopts, s, sizeof(*s))) | |
417 | continue; | |
418 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) | |
419 | continue; | |
420 | stab->refcnt++; | |
f3b9605d | 421 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
422 | return stab; |
423 | } | |
424 | ||
f3b9605d | 425 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
426 | |
427 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); | |
428 | if (!stab) | |
429 | return ERR_PTR(-ENOMEM); | |
430 | ||
431 | stab->refcnt = 1; | |
432 | stab->szopts = *s; | |
433 | if (tsize > 0) | |
434 | memcpy(stab->data, tab, tsize * sizeof(u16)); | |
435 | ||
f3b9605d | 436 | spin_lock(&qdisc_stab_lock); |
175f9c1b | 437 | list_add_tail(&stab->list, &qdisc_stab_list); |
f3b9605d | 438 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
439 | |
440 | return stab; | |
441 | } | |
442 | ||
a2da570d ED |
443 | static void stab_kfree_rcu(struct rcu_head *head) |
444 | { | |
445 | kfree(container_of(head, struct qdisc_size_table, rcu)); | |
446 | } | |
447 | ||
175f9c1b JK |
448 | void qdisc_put_stab(struct qdisc_size_table *tab) |
449 | { | |
450 | if (!tab) | |
451 | return; | |
452 | ||
f3b9605d | 453 | spin_lock(&qdisc_stab_lock); |
175f9c1b JK |
454 | |
455 | if (--tab->refcnt == 0) { | |
456 | list_del(&tab->list); | |
a2da570d | 457 | call_rcu_bh(&tab->rcu, stab_kfree_rcu); |
175f9c1b JK |
458 | } |
459 | ||
f3b9605d | 460 | spin_unlock(&qdisc_stab_lock); |
175f9c1b JK |
461 | } |
462 | EXPORT_SYMBOL(qdisc_put_stab); | |
463 | ||
464 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) | |
465 | { | |
466 | struct nlattr *nest; | |
467 | ||
468 | nest = nla_nest_start(skb, TCA_STAB); | |
3aa4614d PM |
469 | if (nest == NULL) |
470 | goto nla_put_failure; | |
1b34ec43 DM |
471 | if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts)) |
472 | goto nla_put_failure; | |
175f9c1b JK |
473 | nla_nest_end(skb, nest); |
474 | ||
475 | return skb->len; | |
476 | ||
477 | nla_put_failure: | |
478 | return -1; | |
479 | } | |
480 | ||
a2da570d | 481 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab) |
175f9c1b JK |
482 | { |
483 | int pkt_len, slot; | |
484 | ||
485 | pkt_len = skb->len + stab->szopts.overhead; | |
486 | if (unlikely(!stab->szopts.tsize)) | |
487 | goto out; | |
488 | ||
489 | slot = pkt_len + stab->szopts.cell_align; | |
490 | if (unlikely(slot < 0)) | |
491 | slot = 0; | |
492 | ||
493 | slot >>= stab->szopts.cell_log; | |
494 | if (likely(slot < stab->szopts.tsize)) | |
495 | pkt_len = stab->data[slot]; | |
496 | else | |
497 | pkt_len = stab->data[stab->szopts.tsize - 1] * | |
498 | (slot / stab->szopts.tsize) + | |
499 | stab->data[slot % stab->szopts.tsize]; | |
500 | ||
501 | pkt_len <<= stab->szopts.size_log; | |
502 | out: | |
503 | if (unlikely(pkt_len < 1)) | |
504 | pkt_len = 1; | |
505 | qdisc_skb_cb(skb)->pkt_len = pkt_len; | |
506 | } | |
a2da570d | 507 | EXPORT_SYMBOL(__qdisc_calculate_pkt_len); |
175f9c1b | 508 | |
b00355db JP |
509 | void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc) |
510 | { | |
511 | if (!(qdisc->flags & TCQ_F_WARN_NONWC)) { | |
cc7ec456 ED |
512 | pr_warn("%s: %s qdisc %X: is non-work-conserving?\n", |
513 | txt, qdisc->ops->id, qdisc->handle >> 16); | |
b00355db JP |
514 | qdisc->flags |= TCQ_F_WARN_NONWC; |
515 | } | |
516 | } | |
517 | EXPORT_SYMBOL(qdisc_warn_nonwc); | |
518 | ||
4179477f PM |
519 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
520 | { | |
521 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, | |
2fbd3da3 | 522 | timer); |
4179477f | 523 | |
fd245a4a | 524 | qdisc_unthrottled(wd->qdisc); |
8608db03 | 525 | __netif_schedule(qdisc_root(wd->qdisc)); |
1936502d | 526 | |
4179477f PM |
527 | return HRTIMER_NORESTART; |
528 | } | |
529 | ||
530 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) | |
531 | { | |
2fbd3da3 DM |
532 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
533 | wd->timer.function = qdisc_watchdog; | |
4179477f PM |
534 | wd->qdisc = qdisc; |
535 | } | |
536 | EXPORT_SYMBOL(qdisc_watchdog_init); | |
537 | ||
34c5d292 | 538 | void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires) |
4179477f | 539 | { |
2540e051 JP |
540 | if (test_bit(__QDISC_STATE_DEACTIVATED, |
541 | &qdisc_root_sleeping(wd->qdisc)->state)) | |
542 | return; | |
543 | ||
fd245a4a | 544 | qdisc_throttled(wd->qdisc); |
46baac38 ED |
545 | |
546 | hrtimer_start(&wd->timer, | |
34c5d292 | 547 | ns_to_ktime(expires), |
46baac38 | 548 | HRTIMER_MODE_ABS); |
4179477f | 549 | } |
34c5d292 | 550 | EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
4179477f PM |
551 | |
552 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) | |
553 | { | |
2fbd3da3 | 554 | hrtimer_cancel(&wd->timer); |
fd245a4a | 555 | qdisc_unthrottled(wd->qdisc); |
4179477f PM |
556 | } |
557 | EXPORT_SYMBOL(qdisc_watchdog_cancel); | |
1da177e4 | 558 | |
a94f779f | 559 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
6fe1c7a5 PM |
560 | { |
561 | unsigned int size = n * sizeof(struct hlist_head), i; | |
562 | struct hlist_head *h; | |
563 | ||
564 | if (size <= PAGE_SIZE) | |
565 | h = kmalloc(size, GFP_KERNEL); | |
566 | else | |
567 | h = (struct hlist_head *) | |
568 | __get_free_pages(GFP_KERNEL, get_order(size)); | |
569 | ||
570 | if (h != NULL) { | |
571 | for (i = 0; i < n; i++) | |
572 | INIT_HLIST_HEAD(&h[i]); | |
573 | } | |
574 | return h; | |
575 | } | |
576 | ||
577 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) | |
578 | { | |
579 | unsigned int size = n * sizeof(struct hlist_head); | |
580 | ||
581 | if (size <= PAGE_SIZE) | |
582 | kfree(h); | |
583 | else | |
584 | free_pages((unsigned long)h, get_order(size)); | |
585 | } | |
586 | ||
587 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) | |
588 | { | |
589 | struct Qdisc_class_common *cl; | |
b67bfe0d | 590 | struct hlist_node *next; |
6fe1c7a5 PM |
591 | struct hlist_head *nhash, *ohash; |
592 | unsigned int nsize, nmask, osize; | |
593 | unsigned int i, h; | |
594 | ||
595 | /* Rehash when load factor exceeds 0.75 */ | |
596 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) | |
597 | return; | |
598 | nsize = clhash->hashsize * 2; | |
599 | nmask = nsize - 1; | |
600 | nhash = qdisc_class_hash_alloc(nsize); | |
601 | if (nhash == NULL) | |
602 | return; | |
603 | ||
604 | ohash = clhash->hash; | |
605 | osize = clhash->hashsize; | |
606 | ||
607 | sch_tree_lock(sch); | |
608 | for (i = 0; i < osize; i++) { | |
b67bfe0d | 609 | hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) { |
6fe1c7a5 PM |
610 | h = qdisc_class_hash(cl->classid, nmask); |
611 | hlist_add_head(&cl->hnode, &nhash[h]); | |
612 | } | |
613 | } | |
614 | clhash->hash = nhash; | |
615 | clhash->hashsize = nsize; | |
616 | clhash->hashmask = nmask; | |
617 | sch_tree_unlock(sch); | |
618 | ||
619 | qdisc_class_hash_free(ohash, osize); | |
620 | } | |
621 | EXPORT_SYMBOL(qdisc_class_hash_grow); | |
622 | ||
623 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) | |
624 | { | |
625 | unsigned int size = 4; | |
626 | ||
627 | clhash->hash = qdisc_class_hash_alloc(size); | |
628 | if (clhash->hash == NULL) | |
629 | return -ENOMEM; | |
630 | clhash->hashsize = size; | |
631 | clhash->hashmask = size - 1; | |
632 | clhash->hashelems = 0; | |
633 | return 0; | |
634 | } | |
635 | EXPORT_SYMBOL(qdisc_class_hash_init); | |
636 | ||
637 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) | |
638 | { | |
639 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); | |
640 | } | |
641 | EXPORT_SYMBOL(qdisc_class_hash_destroy); | |
642 | ||
643 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, | |
644 | struct Qdisc_class_common *cl) | |
645 | { | |
646 | unsigned int h; | |
647 | ||
648 | INIT_HLIST_NODE(&cl->hnode); | |
649 | h = qdisc_class_hash(cl->classid, clhash->hashmask); | |
650 | hlist_add_head(&cl->hnode, &clhash->hash[h]); | |
651 | clhash->hashelems++; | |
652 | } | |
653 | EXPORT_SYMBOL(qdisc_class_hash_insert); | |
654 | ||
655 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, | |
656 | struct Qdisc_class_common *cl) | |
657 | { | |
658 | hlist_del(&cl->hnode); | |
659 | clhash->hashelems--; | |
660 | } | |
661 | EXPORT_SYMBOL(qdisc_class_hash_remove); | |
662 | ||
fa0f5aa7 ED |
663 | /* Allocate an unique handle from space managed by kernel |
664 | * Possible range is [8000-FFFF]:0000 (0x8000 values) | |
665 | */ | |
1da177e4 LT |
666 | static u32 qdisc_alloc_handle(struct net_device *dev) |
667 | { | |
fa0f5aa7 | 668 | int i = 0x8000; |
1da177e4 LT |
669 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
670 | ||
671 | do { | |
672 | autohandle += TC_H_MAKE(0x10000U, 0); | |
673 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) | |
674 | autohandle = TC_H_MAKE(0x80000000U, 0); | |
fa0f5aa7 ED |
675 | if (!qdisc_lookup(dev, autohandle)) |
676 | return autohandle; | |
677 | cond_resched(); | |
678 | } while (--i > 0); | |
1da177e4 | 679 | |
fa0f5aa7 | 680 | return 0; |
1da177e4 LT |
681 | } |
682 | ||
43effa1e PM |
683 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
684 | { | |
20fea08b | 685 | const struct Qdisc_class_ops *cops; |
43effa1e PM |
686 | unsigned long cl; |
687 | u32 parentid; | |
688 | ||
689 | if (n == 0) | |
690 | return; | |
691 | while ((parentid = sch->parent)) { | |
066a3b5b JP |
692 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
693 | return; | |
694 | ||
5ce2d488 | 695 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
ffc8fefa PM |
696 | if (sch == NULL) { |
697 | WARN_ON(parentid != TC_H_ROOT); | |
698 | return; | |
699 | } | |
43effa1e PM |
700 | cops = sch->ops->cl_ops; |
701 | if (cops->qlen_notify) { | |
702 | cl = cops->get(sch, parentid); | |
703 | cops->qlen_notify(sch, cl); | |
704 | cops->put(sch, cl); | |
705 | } | |
706 | sch->q.qlen -= n; | |
707 | } | |
708 | } | |
709 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); | |
1da177e4 | 710 | |
7316ae88 TG |
711 | static void notify_and_destroy(struct net *net, struct sk_buff *skb, |
712 | struct nlmsghdr *n, u32 clid, | |
99194cff DM |
713 | struct Qdisc *old, struct Qdisc *new) |
714 | { | |
715 | if (new || old) | |
7316ae88 | 716 | qdisc_notify(net, skb, n, clid, old, new); |
1da177e4 | 717 | |
4d8863a2 | 718 | if (old) |
99194cff | 719 | qdisc_destroy(old); |
99194cff DM |
720 | } |
721 | ||
722 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or | |
723 | * to device "dev". | |
724 | * | |
725 | * When appropriate send a netlink notification using 'skb' | |
726 | * and "n". | |
727 | * | |
728 | * On success, destroy old qdisc. | |
1da177e4 LT |
729 | */ |
730 | ||
731 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, | |
99194cff DM |
732 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
733 | struct Qdisc *new, struct Qdisc *old) | |
1da177e4 | 734 | { |
99194cff | 735 | struct Qdisc *q = old; |
7316ae88 | 736 | struct net *net = dev_net(dev); |
1da177e4 | 737 | int err = 0; |
1da177e4 | 738 | |
10297b99 | 739 | if (parent == NULL) { |
99194cff DM |
740 | unsigned int i, num_q, ingress; |
741 | ||
742 | ingress = 0; | |
743 | num_q = dev->num_tx_queues; | |
8d50b53d DM |
744 | if ((q && q->flags & TCQ_F_INGRESS) || |
745 | (new && new->flags & TCQ_F_INGRESS)) { | |
99194cff DM |
746 | num_q = 1; |
747 | ingress = 1; | |
24824a09 ED |
748 | if (!dev_ingress_queue(dev)) |
749 | return -ENOENT; | |
99194cff DM |
750 | } |
751 | ||
752 | if (dev->flags & IFF_UP) | |
753 | dev_deactivate(dev); | |
754 | ||
46b0a054 WC |
755 | if (new && new->ops->attach) |
756 | goto skip; | |
6ec1c69a | 757 | |
99194cff | 758 | for (i = 0; i < num_q; i++) { |
24824a09 | 759 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
760 | |
761 | if (!ingress) | |
762 | dev_queue = netdev_get_tx_queue(dev, i); | |
763 | ||
8d50b53d DM |
764 | old = dev_graft_qdisc(dev_queue, new); |
765 | if (new && i > 0) | |
766 | atomic_inc(&new->refcnt); | |
767 | ||
036d6a67 JP |
768 | if (!ingress) |
769 | qdisc_destroy(old); | |
1da177e4 | 770 | } |
99194cff | 771 | |
46b0a054 | 772 | skip: |
036d6a67 | 773 | if (!ingress) { |
7316ae88 TG |
774 | notify_and_destroy(net, skb, n, classid, |
775 | dev->qdisc, new); | |
036d6a67 JP |
776 | if (new && !new->ops->attach) |
777 | atomic_inc(&new->refcnt); | |
778 | dev->qdisc = new ? : &noop_qdisc; | |
46b0a054 WC |
779 | |
780 | if (new && new->ops->attach) | |
781 | new->ops->attach(new); | |
036d6a67 | 782 | } else { |
7316ae88 | 783 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 784 | } |
af356afa | 785 | |
99194cff DM |
786 | if (dev->flags & IFF_UP) |
787 | dev_activate(dev); | |
1da177e4 | 788 | } else { |
20fea08b | 789 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 790 | |
c9f1d038 PM |
791 | err = -EOPNOTSUPP; |
792 | if (cops && cops->graft) { | |
1da177e4 LT |
793 | unsigned long cl = cops->get(parent, classid); |
794 | if (cl) { | |
99194cff | 795 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 796 | cops->put(parent, cl); |
c9f1d038 PM |
797 | } else |
798 | err = -ENOENT; | |
1da177e4 | 799 | } |
99194cff | 800 | if (!err) |
7316ae88 | 801 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
802 | } |
803 | return err; | |
804 | } | |
805 | ||
25bfcd5a JP |
806 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
807 | static struct lock_class_key qdisc_tx_lock; | |
808 | static struct lock_class_key qdisc_rx_lock; | |
809 | ||
1da177e4 LT |
810 | /* |
811 | Allocate and initialize new qdisc. | |
812 | ||
813 | Parameters are passed via opt. | |
814 | */ | |
815 | ||
816 | static struct Qdisc * | |
bb949fbd | 817 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
23bcf634 PM |
818 | struct Qdisc *p, u32 parent, u32 handle, |
819 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
820 | { |
821 | int err; | |
1e90474c | 822 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
823 | struct Qdisc *sch; |
824 | struct Qdisc_ops *ops; | |
175f9c1b | 825 | struct qdisc_size_table *stab; |
1da177e4 LT |
826 | |
827 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 828 | #ifdef CONFIG_MODULES |
1da177e4 LT |
829 | if (ops == NULL && kind != NULL) { |
830 | char name[IFNAMSIZ]; | |
1e90474c | 831 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
832 | /* We dropped the RTNL semaphore in order to |
833 | * perform the module load. So, even if we | |
834 | * succeeded in loading the module we have to | |
835 | * tell the caller to replay the request. We | |
836 | * indicate this using -EAGAIN. | |
837 | * We replay the request because the device may | |
838 | * go away in the mean time. | |
839 | */ | |
840 | rtnl_unlock(); | |
841 | request_module("sch_%s", name); | |
842 | rtnl_lock(); | |
843 | ops = qdisc_lookup_ops(kind); | |
844 | if (ops != NULL) { | |
845 | /* We will try again qdisc_lookup_ops, | |
846 | * so don't keep a reference. | |
847 | */ | |
848 | module_put(ops->owner); | |
849 | err = -EAGAIN; | |
850 | goto err_out; | |
851 | } | |
852 | } | |
853 | } | |
854 | #endif | |
855 | ||
b9e2cc0f | 856 | err = -ENOENT; |
1da177e4 LT |
857 | if (ops == NULL) |
858 | goto err_out; | |
859 | ||
5ce2d488 | 860 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
861 | if (IS_ERR(sch)) { |
862 | err = PTR_ERR(sch); | |
1da177e4 | 863 | goto err_out2; |
3d54b82f | 864 | } |
1da177e4 | 865 | |
ffc8fefa PM |
866 | sch->parent = parent; |
867 | ||
3d54b82f | 868 | if (handle == TC_H_INGRESS) { |
1da177e4 | 869 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 870 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 871 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 872 | } else { |
fd44de7c PM |
873 | if (handle == 0) { |
874 | handle = qdisc_alloc_handle(dev); | |
875 | err = -ENOMEM; | |
876 | if (handle == 0) | |
877 | goto err_out3; | |
878 | } | |
25bfcd5a | 879 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1abbe139 ED |
880 | if (!netif_is_multiqueue(dev)) |
881 | sch->flags |= TCQ_F_ONETXQUEUE; | |
1da177e4 LT |
882 | } |
883 | ||
3d54b82f | 884 | sch->handle = handle; |
1da177e4 | 885 | |
1e90474c | 886 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
887 | if (tca[TCA_STAB]) { |
888 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
889 | if (IS_ERR(stab)) { | |
890 | err = PTR_ERR(stab); | |
7c64b9f3 | 891 | goto err_out4; |
175f9c1b | 892 | } |
a2da570d | 893 | rcu_assign_pointer(sch->stab, stab); |
175f9c1b | 894 | } |
1e90474c | 895 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
896 | spinlock_t *root_lock; |
897 | ||
23bcf634 PM |
898 | err = -EOPNOTSUPP; |
899 | if (sch->flags & TCQ_F_MQROOT) | |
900 | goto err_out4; | |
901 | ||
f6f9b93f | 902 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
903 | !(sch->flags & TCQ_F_INGRESS) && |
904 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
f6f9b93f JP |
905 | root_lock = qdisc_root_sleeping_lock(sch); |
906 | else | |
907 | root_lock = qdisc_lock(sch); | |
908 | ||
023e09a7 | 909 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f | 910 | root_lock, tca[TCA_RATE]); |
23bcf634 PM |
911 | if (err) |
912 | goto err_out4; | |
023e09a7 | 913 | } |
f6e0b239 JP |
914 | |
915 | qdisc_list_add(sch); | |
1da177e4 | 916 | |
1da177e4 LT |
917 | return sch; |
918 | } | |
919 | err_out3: | |
920 | dev_put(dev); | |
3d54b82f | 921 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
922 | err_out2: |
923 | module_put(ops->owner); | |
924 | err_out: | |
925 | *errp = err; | |
1da177e4 | 926 | return NULL; |
23bcf634 PM |
927 | |
928 | err_out4: | |
929 | /* | |
930 | * Any broken qdiscs that would require a ops->reset() here? | |
931 | * The qdisc was never in action so it shouldn't be necessary. | |
932 | */ | |
a2da570d | 933 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
934 | if (ops->destroy) |
935 | ops->destroy(sch); | |
936 | goto err_out3; | |
1da177e4 LT |
937 | } |
938 | ||
1e90474c | 939 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 940 | { |
a2da570d | 941 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 942 | int err = 0; |
1da177e4 | 943 | |
175f9c1b | 944 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
945 | if (sch->ops->change == NULL) |
946 | return -EINVAL; | |
1e90474c | 947 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
948 | if (err) |
949 | return err; | |
950 | } | |
175f9c1b JK |
951 | |
952 | if (tca[TCA_STAB]) { | |
953 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
954 | if (IS_ERR(stab)) | |
955 | return PTR_ERR(stab); | |
956 | } | |
957 | ||
a2da570d ED |
958 | ostab = rtnl_dereference(sch->stab); |
959 | rcu_assign_pointer(sch->stab, stab); | |
960 | qdisc_put_stab(ostab); | |
175f9c1b | 961 | |
23bcf634 | 962 | if (tca[TCA_RATE]) { |
71bcb09a SH |
963 | /* NB: ignores errors from replace_estimator |
964 | because change can't be undone. */ | |
23bcf634 PM |
965 | if (sch->flags & TCQ_F_MQROOT) |
966 | goto out; | |
1da177e4 | 967 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
71bcb09a SH |
968 | qdisc_root_sleeping_lock(sch), |
969 | tca[TCA_RATE]); | |
23bcf634 PM |
970 | } |
971 | out: | |
1da177e4 LT |
972 | return 0; |
973 | } | |
974 | ||
cc7ec456 ED |
975 | struct check_loop_arg { |
976 | struct qdisc_walker w; | |
1da177e4 LT |
977 | struct Qdisc *p; |
978 | int depth; | |
979 | }; | |
980 | ||
981 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
982 | ||
983 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
984 | { | |
985 | struct check_loop_arg arg; | |
986 | ||
987 | if (q->ops->cl_ops == NULL) | |
988 | return 0; | |
989 | ||
990 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
991 | arg.w.fn = check_loop_fn; | |
992 | arg.depth = depth; | |
993 | arg.p = p; | |
994 | q->ops->cl_ops->walk(q, &arg.w); | |
995 | return arg.w.stop ? -ELOOP : 0; | |
996 | } | |
997 | ||
998 | static int | |
999 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
1000 | { | |
1001 | struct Qdisc *leaf; | |
20fea08b | 1002 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1003 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1004 | ||
1005 | leaf = cops->leaf(q, cl); | |
1006 | if (leaf) { | |
1007 | if (leaf == arg->p || arg->depth > 7) | |
1008 | return -ELOOP; | |
1009 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1010 | } | |
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | /* | |
1015 | * Delete/get qdisc. | |
1016 | */ | |
1017 | ||
661d2967 | 1018 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1019 | { |
3b1e0a65 | 1020 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1021 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1022 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1023 | struct net_device *dev; |
de179c8c | 1024 | u32 clid; |
1da177e4 LT |
1025 | struct Qdisc *q = NULL; |
1026 | struct Qdisc *p = NULL; | |
1027 | int err; | |
1028 | ||
1141a455 | 1029 | if ((n->nlmsg_type != RTM_GETQDISC) && !netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1030 | return -EPERM; |
1031 | ||
1e90474c PM |
1032 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1033 | if (err < 0) | |
1034 | return err; | |
1035 | ||
de179c8c H |
1036 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1037 | if (!dev) | |
1038 | return -ENODEV; | |
1039 | ||
1040 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1041 | if (clid) { |
1042 | if (clid != TC_H_ROOT) { | |
1043 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 ED |
1044 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1045 | if (!p) | |
1da177e4 LT |
1046 | return -ENOENT; |
1047 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1048 | } else if (dev_ingress_queue(dev)) { |
1049 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1050 | } |
1da177e4 | 1051 | } else { |
af356afa | 1052 | q = dev->qdisc; |
1da177e4 LT |
1053 | } |
1054 | if (!q) | |
1055 | return -ENOENT; | |
1056 | ||
1057 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
1058 | return -EINVAL; | |
1059 | } else { | |
cc7ec456 ED |
1060 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1061 | if (!q) | |
1da177e4 LT |
1062 | return -ENOENT; |
1063 | } | |
1064 | ||
1e90474c | 1065 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1066 | return -EINVAL; |
1067 | ||
1068 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1069 | if (!clid) | |
1070 | return -EINVAL; | |
1071 | if (q->handle == 0) | |
1072 | return -ENOENT; | |
cc7ec456 ED |
1073 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
1074 | if (err != 0) | |
1da177e4 | 1075 | return err; |
1da177e4 | 1076 | } else { |
7316ae88 | 1077 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1078 | } |
1079 | return 0; | |
1080 | } | |
1081 | ||
3c2a0909 S |
1082 | /* |
1083 | * enable/disable flow on qdisc. | |
1084 | */ | |
1085 | void | |
1086 | tc_qdisc_flow_control(struct net_device *dev, u32 tcm_handle, int enable_flow) | |
1087 | { | |
1088 | struct Qdisc *q; | |
1089 | struct __qdisc_change_req { | |
1090 | struct nlattr attr; | |
1091 | struct tc_prio_qopt data; | |
1092 | } req = { | |
1093 | .attr = {sizeof(struct __qdisc_change_req), TCA_OPTIONS}, | |
1094 | .data = {3, {1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1}, 1} | |
1095 | }; | |
1096 | ||
1097 | /* override flow bit */ | |
1098 | req.data.enable_flow = enable_flow; | |
1099 | ||
1100 | /* look up using tcm handle */ | |
1101 | q = qdisc_lookup(dev, tcm_handle); | |
1102 | ||
1103 | /* call registered change function */ | |
1104 | if (q) { | |
1105 | if (q->ops->change(q, &(req.attr)) != 0) | |
1106 | pr_err("tc_qdisc_flow_control: qdisc change failed"); | |
1107 | } | |
1108 | } | |
1109 | EXPORT_SYMBOL(tc_qdisc_flow_control); | |
1110 | ||
1111 | ||
1112 | ||
1da177e4 | 1113 | /* |
cc7ec456 | 1114 | * Create/change qdisc. |
1da177e4 LT |
1115 | */ |
1116 | ||
661d2967 | 1117 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1118 | { |
3b1e0a65 | 1119 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1120 | struct tcmsg *tcm; |
1e90474c | 1121 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1122 | struct net_device *dev; |
1123 | u32 clid; | |
1124 | struct Qdisc *q, *p; | |
1125 | int err; | |
1126 | ||
1141a455 | 1127 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1128 | return -EPERM; |
1129 | ||
1da177e4 LT |
1130 | replay: |
1131 | /* Reinit, just in case something touches this. */ | |
de179c8c H |
1132 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1133 | if (err < 0) | |
1134 | return err; | |
1135 | ||
02ef22ca | 1136 | tcm = nlmsg_data(n); |
1da177e4 LT |
1137 | clid = tcm->tcm_parent; |
1138 | q = p = NULL; | |
1139 | ||
cc7ec456 ED |
1140 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1141 | if (!dev) | |
1da177e4 LT |
1142 | return -ENODEV; |
1143 | ||
1e90474c | 1144 | |
1da177e4 LT |
1145 | if (clid) { |
1146 | if (clid != TC_H_ROOT) { | |
1147 | if (clid != TC_H_INGRESS) { | |
cc7ec456 ED |
1148 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1149 | if (!p) | |
1da177e4 LT |
1150 | return -ENOENT; |
1151 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1152 | } else if (dev_ingress_queue_create(dev)) { |
1153 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1154 | } |
1155 | } else { | |
af356afa | 1156 | q = dev->qdisc; |
1da177e4 LT |
1157 | } |
1158 | ||
1159 | /* It may be default qdisc, ignore it */ | |
1160 | if (q && q->handle == 0) | |
1161 | q = NULL; | |
1162 | ||
1163 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1164 | if (tcm->tcm_handle) { | |
cc7ec456 | 1165 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
1da177e4 LT |
1166 | return -EEXIST; |
1167 | if (TC_H_MIN(tcm->tcm_handle)) | |
1168 | return -EINVAL; | |
cc7ec456 ED |
1169 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1170 | if (!q) | |
1da177e4 | 1171 | goto create_n_graft; |
cc7ec456 | 1172 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1173 | return -EEXIST; |
1e90474c | 1174 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1175 | return -EINVAL; |
1176 | if (q == p || | |
1177 | (p && check_loop(q, p, 0))) | |
1178 | return -ELOOP; | |
1179 | atomic_inc(&q->refcnt); | |
1180 | goto graft; | |
1181 | } else { | |
cc7ec456 | 1182 | if (!q) |
1da177e4 LT |
1183 | goto create_n_graft; |
1184 | ||
1185 | /* This magic test requires explanation. | |
1186 | * | |
1187 | * We know, that some child q is already | |
1188 | * attached to this parent and have choice: | |
1189 | * either to change it or to create/graft new one. | |
1190 | * | |
1191 | * 1. We are allowed to create/graft only | |
1192 | * if CREATE and REPLACE flags are set. | |
1193 | * | |
1194 | * 2. If EXCL is set, requestor wanted to say, | |
1195 | * that qdisc tcm_handle is not expected | |
1196 | * to exist, so that we choose create/graft too. | |
1197 | * | |
1198 | * 3. The last case is when no flags are set. | |
1199 | * Alas, it is sort of hole in API, we | |
1200 | * cannot decide what to do unambiguously. | |
1201 | * For now we select create/graft, if | |
1202 | * user gave KIND, which does not match existing. | |
1203 | */ | |
cc7ec456 ED |
1204 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1205 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1206 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1207 | (tca[TCA_KIND] && |
1208 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1209 | goto create_n_graft; |
1210 | } | |
1211 | } | |
1212 | } else { | |
1213 | if (!tcm->tcm_handle) | |
1214 | return -EINVAL; | |
1215 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1216 | } | |
1217 | ||
1218 | /* Change qdisc parameters */ | |
1219 | if (q == NULL) | |
1220 | return -ENOENT; | |
cc7ec456 | 1221 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1222 | return -EEXIST; |
1e90474c | 1223 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1224 | return -EINVAL; |
1225 | err = qdisc_change(q, tca); | |
1226 | if (err == 0) | |
7316ae88 | 1227 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1228 | return err; |
1229 | ||
1230 | create_n_graft: | |
cc7ec456 | 1231 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
1da177e4 | 1232 | return -ENOENT; |
24824a09 ED |
1233 | if (clid == TC_H_INGRESS) { |
1234 | if (dev_ingress_queue(dev)) | |
1235 | q = qdisc_create(dev, dev_ingress_queue(dev), p, | |
1236 | tcm->tcm_parent, tcm->tcm_parent, | |
1237 | tca, &err); | |
1238 | else | |
1239 | err = -ENOENT; | |
1240 | } else { | |
926e61b7 | 1241 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1242 | |
1243 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1244 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1245 | else if (p) | |
1246 | dev_queue = p->dev_queue; | |
1247 | else | |
1248 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1249 | |
926e61b7 | 1250 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1251 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1252 | tca, &err); |
6ec1c69a | 1253 | } |
1da177e4 LT |
1254 | if (q == NULL) { |
1255 | if (err == -EAGAIN) | |
1256 | goto replay; | |
1257 | return err; | |
1258 | } | |
1259 | ||
1260 | graft: | |
e5befbd9 IJ |
1261 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1262 | if (err) { | |
1263 | if (q) | |
1264 | qdisc_destroy(q); | |
1265 | return err; | |
1da177e4 | 1266 | } |
e5befbd9 | 1267 | |
1da177e4 LT |
1268 | return 0; |
1269 | } | |
1270 | ||
1271 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
15e47304 | 1272 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1273 | { |
1274 | struct tcmsg *tcm; | |
1275 | struct nlmsghdr *nlh; | |
27a884dc | 1276 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1277 | struct gnet_dump d; |
a2da570d | 1278 | struct qdisc_size_table *stab; |
1da177e4 | 1279 | |
15e47304 | 1280 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1281 | if (!nlh) |
1282 | goto out_nlmsg_trim; | |
1283 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1284 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 PM |
1285 | tcm->tcm__pad1 = 0; |
1286 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1287 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1288 | tcm->tcm_parent = clid; |
1289 | tcm->tcm_handle = q->handle; | |
1290 | tcm->tcm_info = atomic_read(&q->refcnt); | |
1b34ec43 DM |
1291 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1292 | goto nla_put_failure; | |
1da177e4 | 1293 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1294 | goto nla_put_failure; |
1da177e4 LT |
1295 | q->qstats.qlen = q->q.qlen; |
1296 | ||
a2da570d ED |
1297 | stab = rtnl_dereference(q->stab); |
1298 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
175f9c1b JK |
1299 | goto nla_put_failure; |
1300 | ||
102396ae JP |
1301 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1302 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1303 | goto nla_put_failure; |
1da177e4 LT |
1304 | |
1305 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1306 | goto nla_put_failure; |
1da177e4 LT |
1307 | |
1308 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
d250a5f9 | 1309 | gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || |
1da177e4 | 1310 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1311 | goto nla_put_failure; |
10297b99 | 1312 | |
1da177e4 | 1313 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1314 | goto nla_put_failure; |
10297b99 | 1315 | |
27a884dc | 1316 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1317 | return skb->len; |
1318 | ||
02ef22ca | 1319 | out_nlmsg_trim: |
1e90474c | 1320 | nla_put_failure: |
dc5fc579 | 1321 | nlmsg_trim(skb, b); |
1da177e4 LT |
1322 | return -1; |
1323 | } | |
1324 | ||
53b0f080 ED |
1325 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1326 | { | |
1327 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1328 | } | |
1329 | ||
7316ae88 TG |
1330 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1331 | struct nlmsghdr *n, u32 clid, | |
1332 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1333 | { |
1334 | struct sk_buff *skb; | |
15e47304 | 1335 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1336 | |
1337 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1338 | if (!skb) | |
1339 | return -ENOBUFS; | |
1340 | ||
53b0f080 | 1341 | if (old && !tc_qdisc_dump_ignore(old)) { |
15e47304 | 1342 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1343 | 0, RTM_DELQDISC) < 0) |
1da177e4 LT |
1344 | goto err_out; |
1345 | } | |
53b0f080 | 1346 | if (new && !tc_qdisc_dump_ignore(new)) { |
15e47304 | 1347 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1348 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
1da177e4 LT |
1349 | goto err_out; |
1350 | } | |
1351 | ||
1352 | if (skb->len) | |
15e47304 | 1353 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1354 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1355 | |
1356 | err_out: | |
1357 | kfree_skb(skb); | |
1358 | return -EINVAL; | |
1359 | } | |
1360 | ||
30723673 DM |
1361 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1362 | struct netlink_callback *cb, | |
1363 | int *q_idx_p, int s_q_idx) | |
1364 | { | |
1365 | int ret = 0, q_idx = *q_idx_p; | |
1366 | struct Qdisc *q; | |
1367 | ||
1368 | if (!root) | |
1369 | return 0; | |
1370 | ||
1371 | q = root; | |
1372 | if (q_idx < s_q_idx) { | |
1373 | q_idx++; | |
1374 | } else { | |
1375 | if (!tc_qdisc_dump_ignore(q) && | |
15e47304 | 1376 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1377 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1378 | goto done; | |
1379 | q_idx++; | |
1380 | } | |
1381 | list_for_each_entry(q, &root->list, list) { | |
1382 | if (q_idx < s_q_idx) { | |
1383 | q_idx++; | |
1384 | continue; | |
1385 | } | |
cc7ec456 | 1386 | if (!tc_qdisc_dump_ignore(q) && |
15e47304 | 1387 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1388 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1389 | goto done; | |
1390 | q_idx++; | |
1391 | } | |
1392 | ||
1393 | out: | |
1394 | *q_idx_p = q_idx; | |
1395 | return ret; | |
1396 | done: | |
1397 | ret = -1; | |
1398 | goto out; | |
1399 | } | |
1400 | ||
1da177e4 LT |
1401 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1402 | { | |
3b1e0a65 | 1403 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1404 | int idx, q_idx; |
1405 | int s_idx, s_q_idx; | |
1406 | struct net_device *dev; | |
1da177e4 LT |
1407 | |
1408 | s_idx = cb->args[0]; | |
1409 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1410 | |
1411 | rcu_read_lock(); | |
7562f876 | 1412 | idx = 0; |
7316ae88 | 1413 | for_each_netdev_rcu(net, dev) { |
30723673 DM |
1414 | struct netdev_queue *dev_queue; |
1415 | ||
1da177e4 | 1416 | if (idx < s_idx) |
7562f876 | 1417 | goto cont; |
1da177e4 LT |
1418 | if (idx > s_idx) |
1419 | s_q_idx = 0; | |
1da177e4 | 1420 | q_idx = 0; |
30723673 | 1421 | |
af356afa | 1422 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1423 | goto done; |
1424 | ||
24824a09 ED |
1425 | dev_queue = dev_ingress_queue(dev); |
1426 | if (dev_queue && | |
1427 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
1428 | &q_idx, s_q_idx) < 0) | |
30723673 DM |
1429 | goto done; |
1430 | ||
7562f876 PE |
1431 | cont: |
1432 | idx++; | |
1da177e4 LT |
1433 | } |
1434 | ||
1435 | done: | |
f1e9016d | 1436 | rcu_read_unlock(); |
1da177e4 LT |
1437 | |
1438 | cb->args[0] = idx; | |
1439 | cb->args[1] = q_idx; | |
1440 | ||
1441 | return skb->len; | |
1442 | } | |
1443 | ||
1444 | ||
1445 | ||
1446 | /************************************************ | |
1447 | * Traffic classes manipulation. * | |
1448 | ************************************************/ | |
1449 | ||
1450 | ||
1451 | ||
661d2967 | 1452 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1453 | { |
3b1e0a65 | 1454 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1455 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1456 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1457 | struct net_device *dev; |
1458 | struct Qdisc *q = NULL; | |
20fea08b | 1459 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1460 | unsigned long cl = 0; |
1461 | unsigned long new_cl; | |
de179c8c H |
1462 | u32 portid; |
1463 | u32 clid; | |
1464 | u32 qid; | |
1da177e4 LT |
1465 | int err; |
1466 | ||
1141a455 | 1467 | if ((n->nlmsg_type != RTM_GETTCLASS) && !netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1468 | return -EPERM; |
1469 | ||
1e90474c PM |
1470 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1471 | if (err < 0) | |
1472 | return err; | |
1473 | ||
de179c8c H |
1474 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1475 | if (!dev) | |
1476 | return -ENODEV; | |
1477 | ||
1da177e4 LT |
1478 | /* |
1479 | parent == TC_H_UNSPEC - unspecified parent. | |
1480 | parent == TC_H_ROOT - class is root, which has no parent. | |
1481 | parent == X:0 - parent is root class. | |
1482 | parent == X:Y - parent is a node in hierarchy. | |
1483 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1484 | ||
1485 | handle == 0:0 - generate handle from kernel pool. | |
1486 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1487 | handle == X:Y - clear. | |
1488 | handle == X:0 - root class. | |
1489 | */ | |
1490 | ||
1491 | /* Step 1. Determine qdisc handle X:0 */ | |
1492 | ||
de179c8c H |
1493 | portid = tcm->tcm_parent; |
1494 | clid = tcm->tcm_handle; | |
1495 | qid = TC_H_MAJ(clid); | |
1496 | ||
15e47304 EB |
1497 | if (portid != TC_H_ROOT) { |
1498 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
1499 | |
1500 | if (qid && qid1) { | |
1501 | /* If both majors are known, they must be identical. */ | |
1502 | if (qid != qid1) | |
1503 | return -EINVAL; | |
1504 | } else if (qid1) { | |
1505 | qid = qid1; | |
1506 | } else if (qid == 0) | |
af356afa | 1507 | qid = dev->qdisc->handle; |
1da177e4 LT |
1508 | |
1509 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1510 | * both with parent and child. |
1511 | * | |
15e47304 | 1512 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 1513 | */ |
15e47304 EB |
1514 | if (portid) |
1515 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
1516 | } else { |
1517 | if (qid == 0) | |
af356afa | 1518 | qid = dev->qdisc->handle; |
1da177e4 LT |
1519 | } |
1520 | ||
1521 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1522 | q = qdisc_lookup(dev, qid); |
1523 | if (!q) | |
1da177e4 LT |
1524 | return -ENOENT; |
1525 | ||
1526 | /* An check that it supports classes */ | |
1527 | cops = q->ops->cl_ops; | |
1528 | if (cops == NULL) | |
1529 | return -EINVAL; | |
1530 | ||
1531 | /* Now try to get class */ | |
1532 | if (clid == 0) { | |
15e47304 | 1533 | if (portid == TC_H_ROOT) |
1da177e4 LT |
1534 | clid = qid; |
1535 | } else | |
1536 | clid = TC_H_MAKE(qid, clid); | |
1537 | ||
1538 | if (clid) | |
1539 | cl = cops->get(q, clid); | |
1540 | ||
1541 | if (cl == 0) { | |
1542 | err = -ENOENT; | |
cc7ec456 ED |
1543 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1544 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1545 | goto out; |
1546 | } else { | |
1547 | switch (n->nlmsg_type) { | |
10297b99 | 1548 | case RTM_NEWTCLASS: |
1da177e4 | 1549 | err = -EEXIST; |
cc7ec456 | 1550 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1551 | goto out; |
1552 | break; | |
1553 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1554 | err = -EOPNOTSUPP; |
1555 | if (cops->delete) | |
1556 | err = cops->delete(q, cl); | |
1da177e4 | 1557 | if (err == 0) |
7316ae88 | 1558 | tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); |
1da177e4 LT |
1559 | goto out; |
1560 | case RTM_GETTCLASS: | |
7316ae88 | 1561 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1562 | goto out; |
1563 | default: | |
1564 | err = -EINVAL; | |
1565 | goto out; | |
1566 | } | |
1567 | } | |
1568 | ||
1569 | new_cl = cl; | |
de6d5cdf PM |
1570 | err = -EOPNOTSUPP; |
1571 | if (cops->change) | |
15e47304 | 1572 | err = cops->change(q, clid, portid, tca, &new_cl); |
1da177e4 | 1573 | if (err == 0) |
7316ae88 | 1574 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1575 | |
1576 | out: | |
1577 | if (cl) | |
1578 | cops->put(q, cl); | |
1579 | ||
1580 | return err; | |
1581 | } | |
1582 | ||
1583 | ||
1584 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1585 | unsigned long cl, | |
15e47304 | 1586 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1587 | { |
1588 | struct tcmsg *tcm; | |
1589 | struct nlmsghdr *nlh; | |
27a884dc | 1590 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1591 | struct gnet_dump d; |
20fea08b | 1592 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1593 | |
15e47304 | 1594 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1595 | if (!nlh) |
1596 | goto out_nlmsg_trim; | |
1597 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1598 | tcm->tcm_family = AF_UNSPEC; |
16ebb5e0 ED |
1599 | tcm->tcm__pad1 = 0; |
1600 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1601 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1602 | tcm->tcm_parent = q->handle; |
1603 | tcm->tcm_handle = q->handle; | |
1604 | tcm->tcm_info = 0; | |
1b34ec43 DM |
1605 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1606 | goto nla_put_failure; | |
1da177e4 | 1607 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1608 | goto nla_put_failure; |
1da177e4 | 1609 | |
102396ae JP |
1610 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1611 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1612 | goto nla_put_failure; |
1da177e4 LT |
1613 | |
1614 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1615 | goto nla_put_failure; |
1da177e4 LT |
1616 | |
1617 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1618 | goto nla_put_failure; |
1da177e4 | 1619 | |
27a884dc | 1620 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1621 | return skb->len; |
1622 | ||
02ef22ca | 1623 | out_nlmsg_trim: |
1e90474c | 1624 | nla_put_failure: |
dc5fc579 | 1625 | nlmsg_trim(skb, b); |
1da177e4 LT |
1626 | return -1; |
1627 | } | |
1628 | ||
7316ae88 TG |
1629 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1630 | struct nlmsghdr *n, struct Qdisc *q, | |
1631 | unsigned long cl, int event) | |
1da177e4 LT |
1632 | { |
1633 | struct sk_buff *skb; | |
15e47304 | 1634 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1635 | |
1636 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1637 | if (!skb) | |
1638 | return -ENOBUFS; | |
1639 | ||
15e47304 | 1640 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { |
1da177e4 LT |
1641 | kfree_skb(skb); |
1642 | return -EINVAL; | |
1643 | } | |
1644 | ||
15e47304 | 1645 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1646 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1647 | } |
1648 | ||
cc7ec456 ED |
1649 | struct qdisc_dump_args { |
1650 | struct qdisc_walker w; | |
1651 | struct sk_buff *skb; | |
1652 | struct netlink_callback *cb; | |
1da177e4 LT |
1653 | }; |
1654 | ||
1655 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1656 | { | |
1657 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1658 | ||
15e47304 | 1659 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
1da177e4 LT |
1660 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); |
1661 | } | |
1662 | ||
30723673 DM |
1663 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1664 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1665 | int *t_p, int s_t) | |
1666 | { | |
1667 | struct qdisc_dump_args arg; | |
1668 | ||
1669 | if (tc_qdisc_dump_ignore(q) || | |
1670 | *t_p < s_t || !q->ops->cl_ops || | |
1671 | (tcm->tcm_parent && | |
1672 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1673 | (*t_p)++; | |
1674 | return 0; | |
1675 | } | |
1676 | if (*t_p > s_t) | |
1677 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1678 | arg.w.fn = qdisc_class_dump; | |
1679 | arg.skb = skb; | |
1680 | arg.cb = cb; | |
1681 | arg.w.stop = 0; | |
1682 | arg.w.skip = cb->args[1]; | |
1683 | arg.w.count = 0; | |
1684 | q->ops->cl_ops->walk(q, &arg.w); | |
1685 | cb->args[1] = arg.w.count; | |
1686 | if (arg.w.stop) | |
1687 | return -1; | |
1688 | (*t_p)++; | |
1689 | return 0; | |
1690 | } | |
1691 | ||
1692 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1693 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1694 | int *t_p, int s_t) | |
1695 | { | |
1696 | struct Qdisc *q; | |
1697 | ||
1698 | if (!root) | |
1699 | return 0; | |
1700 | ||
1701 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1702 | return -1; | |
1703 | ||
1704 | list_for_each_entry(q, &root->list, list) { | |
1705 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1706 | return -1; | |
1707 | } | |
1708 | ||
1709 | return 0; | |
1710 | } | |
1711 | ||
1da177e4 LT |
1712 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1713 | { | |
02ef22ca | 1714 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 1715 | struct net *net = sock_net(skb->sk); |
30723673 | 1716 | struct netdev_queue *dev_queue; |
1da177e4 | 1717 | struct net_device *dev; |
30723673 | 1718 | int t, s_t; |
1da177e4 | 1719 | |
573ce260 | 1720 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1721 | return 0; |
cc7ec456 ED |
1722 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
1723 | if (!dev) | |
1da177e4 LT |
1724 | return 0; |
1725 | ||
1726 | s_t = cb->args[0]; | |
1727 | t = 0; | |
1728 | ||
af356afa | 1729 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1730 | goto done; |
1731 | ||
24824a09 ED |
1732 | dev_queue = dev_ingress_queue(dev); |
1733 | if (dev_queue && | |
1734 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
1735 | &t, s_t) < 0) | |
30723673 | 1736 | goto done; |
1da177e4 | 1737 | |
30723673 | 1738 | done: |
1da177e4 LT |
1739 | cb->args[0] = t; |
1740 | ||
1741 | dev_put(dev); | |
1742 | return skb->len; | |
1743 | } | |
1744 | ||
1745 | /* Main classifier routine: scans classifier chain attached | |
cc7ec456 ED |
1746 | * to this qdisc, (optionally) tests for protocol and asks |
1747 | * specific classifiers. | |
1da177e4 | 1748 | */ |
dc7f9f6e | 1749 | int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp, |
73ca4918 PM |
1750 | struct tcf_result *res) |
1751 | { | |
1752 | __be16 protocol = skb->protocol; | |
cc7ec456 | 1753 | int err; |
73ca4918 PM |
1754 | |
1755 | for (; tp; tp = tp->next) { | |
cc7ec456 ED |
1756 | if (tp->protocol != protocol && |
1757 | tp->protocol != htons(ETH_P_ALL)) | |
1758 | continue; | |
1759 | err = tp->classify(skb, tp, res); | |
1760 | ||
1761 | if (err >= 0) { | |
73ca4918 PM |
1762 | #ifdef CONFIG_NET_CLS_ACT |
1763 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1764 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1765 | #endif | |
1766 | return err; | |
1767 | } | |
1768 | } | |
1769 | return -1; | |
1770 | } | |
1771 | EXPORT_SYMBOL(tc_classify_compat); | |
1772 | ||
dc7f9f6e | 1773 | int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
73ca4918 | 1774 | struct tcf_result *res) |
1da177e4 LT |
1775 | { |
1776 | int err = 0; | |
1da177e4 | 1777 | #ifdef CONFIG_NET_CLS_ACT |
dc7f9f6e | 1778 | const struct tcf_proto *otp = tp; |
1da177e4 | 1779 | reclassify: |
52bc9747 | 1780 | #endif |
1da177e4 | 1781 | |
73ca4918 | 1782 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1783 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1784 | if (err == TC_ACT_RECLASSIFY) { |
1785 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1786 | tp = otp; | |
1787 | ||
1788 | if (verd++ >= MAX_REC_LOOP) { | |
e87cc472 JP |
1789 | net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n", |
1790 | tp->q->ops->id, | |
1791 | tp->prio & 0xffff, | |
1792 | ntohs(tp->protocol)); | |
73ca4918 | 1793 | return TC_ACT_SHOT; |
1da177e4 | 1794 | } |
73ca4918 PM |
1795 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1796 | goto reclassify; | |
1da177e4 | 1797 | } |
73ca4918 PM |
1798 | #endif |
1799 | return err; | |
1da177e4 | 1800 | } |
73ca4918 | 1801 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1802 | |
a48b5a61 PM |
1803 | void tcf_destroy(struct tcf_proto *tp) |
1804 | { | |
1805 | tp->ops->destroy(tp); | |
1806 | module_put(tp->ops->owner); | |
1807 | kfree(tp); | |
1808 | } | |
1809 | ||
ff31ab56 | 1810 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1811 | { |
1812 | struct tcf_proto *tp; | |
1813 | ||
ff31ab56 PM |
1814 | while ((tp = *fl) != NULL) { |
1815 | *fl = tp->next; | |
a48b5a61 PM |
1816 | tcf_destroy(tp); |
1817 | } | |
1818 | } | |
1819 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1820 | ||
1da177e4 LT |
1821 | #ifdef CONFIG_PROC_FS |
1822 | static int psched_show(struct seq_file *seq, void *v) | |
1823 | { | |
3c0cfc13 PM |
1824 | struct timespec ts; |
1825 | ||
1826 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1827 | seq_printf(seq, "%08x %08x %08x %08x\n", |
ca44d6e6 | 1828 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1829 | 1000000, |
3c0cfc13 | 1830 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1831 | |
1832 | return 0; | |
1833 | } | |
1834 | ||
1835 | static int psched_open(struct inode *inode, struct file *file) | |
1836 | { | |
7e5ab157 | 1837 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1838 | } |
1839 | ||
da7071d7 | 1840 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1841 | .owner = THIS_MODULE, |
1842 | .open = psched_open, | |
1843 | .read = seq_read, | |
1844 | .llseek = seq_lseek, | |
1845 | .release = single_release, | |
10297b99 | 1846 | }; |
7316ae88 TG |
1847 | |
1848 | static int __net_init psched_net_init(struct net *net) | |
1849 | { | |
1850 | struct proc_dir_entry *e; | |
1851 | ||
d4beaa66 | 1852 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
7316ae88 TG |
1853 | if (e == NULL) |
1854 | return -ENOMEM; | |
1855 | ||
1856 | return 0; | |
1857 | } | |
1858 | ||
1859 | static void __net_exit psched_net_exit(struct net *net) | |
1860 | { | |
ece31ffd | 1861 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
1862 | } |
1863 | #else | |
1864 | static int __net_init psched_net_init(struct net *net) | |
1865 | { | |
1866 | return 0; | |
1867 | } | |
1868 | ||
1869 | static void __net_exit psched_net_exit(struct net *net) | |
1870 | { | |
1871 | } | |
1da177e4 LT |
1872 | #endif |
1873 | ||
7316ae88 TG |
1874 | static struct pernet_operations psched_net_ops = { |
1875 | .init = psched_net_init, | |
1876 | .exit = psched_net_exit, | |
1877 | }; | |
1878 | ||
1da177e4 LT |
1879 | static int __init pktsched_init(void) |
1880 | { | |
7316ae88 TG |
1881 | int err; |
1882 | ||
1883 | err = register_pernet_subsys(&psched_net_ops); | |
1884 | if (err) { | |
cc7ec456 | 1885 | pr_err("pktsched_init: " |
7316ae88 TG |
1886 | "cannot initialize per netns operations\n"); |
1887 | return err; | |
1888 | } | |
1889 | ||
1da177e4 LT |
1890 | register_qdisc(&pfifo_qdisc_ops); |
1891 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1892 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1893 | register_qdisc(&mq_qdisc_ops); |
1da177e4 | 1894 | |
c7ac8679 GR |
1895 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL); |
1896 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL); | |
1897 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL); | |
1898 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL); | |
1899 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL); | |
1900 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL); | |
be577ddc | 1901 | |
1da177e4 LT |
1902 | return 0; |
1903 | } | |
1904 | ||
1905 | subsys_initcall(pktsched_init); |