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 | ||
8a8e3d84 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); |
8a8e3d84 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 | ||
6ec1c69a DM |
755 | if (new && new->ops->attach) { |
756 | new->ops->attach(new); | |
757 | num_q = 0; | |
758 | } | |
759 | ||
99194cff | 760 | for (i = 0; i < num_q; i++) { |
24824a09 | 761 | struct netdev_queue *dev_queue = dev_ingress_queue(dev); |
99194cff DM |
762 | |
763 | if (!ingress) | |
764 | dev_queue = netdev_get_tx_queue(dev, i); | |
765 | ||
8d50b53d DM |
766 | old = dev_graft_qdisc(dev_queue, new); |
767 | if (new && i > 0) | |
768 | atomic_inc(&new->refcnt); | |
769 | ||
036d6a67 JP |
770 | if (!ingress) |
771 | qdisc_destroy(old); | |
1da177e4 | 772 | } |
99194cff | 773 | |
036d6a67 | 774 | if (!ingress) { |
7316ae88 TG |
775 | notify_and_destroy(net, skb, n, classid, |
776 | dev->qdisc, new); | |
036d6a67 JP |
777 | if (new && !new->ops->attach) |
778 | atomic_inc(&new->refcnt); | |
779 | dev->qdisc = new ? : &noop_qdisc; | |
780 | } else { | |
7316ae88 | 781 | notify_and_destroy(net, skb, n, classid, old, new); |
036d6a67 | 782 | } |
af356afa | 783 | |
99194cff DM |
784 | if (dev->flags & IFF_UP) |
785 | dev_activate(dev); | |
1da177e4 | 786 | } else { |
20fea08b | 787 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
1da177e4 | 788 | |
c9f1d038 PM |
789 | err = -EOPNOTSUPP; |
790 | if (cops && cops->graft) { | |
1da177e4 LT |
791 | unsigned long cl = cops->get(parent, classid); |
792 | if (cl) { | |
99194cff | 793 | err = cops->graft(parent, cl, new, &old); |
1da177e4 | 794 | cops->put(parent, cl); |
c9f1d038 PM |
795 | } else |
796 | err = -ENOENT; | |
1da177e4 | 797 | } |
99194cff | 798 | if (!err) |
7316ae88 | 799 | notify_and_destroy(net, skb, n, classid, old, new); |
1da177e4 LT |
800 | } |
801 | return err; | |
802 | } | |
803 | ||
25bfcd5a JP |
804 | /* lockdep annotation is needed for ingress; egress gets it only for name */ |
805 | static struct lock_class_key qdisc_tx_lock; | |
806 | static struct lock_class_key qdisc_rx_lock; | |
807 | ||
1da177e4 LT |
808 | /* |
809 | Allocate and initialize new qdisc. | |
810 | ||
811 | Parameters are passed via opt. | |
812 | */ | |
813 | ||
814 | static struct Qdisc * | |
bb949fbd | 815 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
23bcf634 PM |
816 | struct Qdisc *p, u32 parent, u32 handle, |
817 | struct nlattr **tca, int *errp) | |
1da177e4 LT |
818 | { |
819 | int err; | |
1e90474c | 820 | struct nlattr *kind = tca[TCA_KIND]; |
1da177e4 LT |
821 | struct Qdisc *sch; |
822 | struct Qdisc_ops *ops; | |
175f9c1b | 823 | struct qdisc_size_table *stab; |
1da177e4 LT |
824 | |
825 | ops = qdisc_lookup_ops(kind); | |
95a5afca | 826 | #ifdef CONFIG_MODULES |
1da177e4 LT |
827 | if (ops == NULL && kind != NULL) { |
828 | char name[IFNAMSIZ]; | |
1e90474c | 829 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
1da177e4 LT |
830 | /* We dropped the RTNL semaphore in order to |
831 | * perform the module load. So, even if we | |
832 | * succeeded in loading the module we have to | |
833 | * tell the caller to replay the request. We | |
834 | * indicate this using -EAGAIN. | |
835 | * We replay the request because the device may | |
836 | * go away in the mean time. | |
837 | */ | |
838 | rtnl_unlock(); | |
839 | request_module("sch_%s", name); | |
840 | rtnl_lock(); | |
841 | ops = qdisc_lookup_ops(kind); | |
842 | if (ops != NULL) { | |
843 | /* We will try again qdisc_lookup_ops, | |
844 | * so don't keep a reference. | |
845 | */ | |
846 | module_put(ops->owner); | |
847 | err = -EAGAIN; | |
848 | goto err_out; | |
849 | } | |
850 | } | |
851 | } | |
852 | #endif | |
853 | ||
b9e2cc0f | 854 | err = -ENOENT; |
1da177e4 LT |
855 | if (ops == NULL) |
856 | goto err_out; | |
857 | ||
5ce2d488 | 858 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
859 | if (IS_ERR(sch)) { |
860 | err = PTR_ERR(sch); | |
1da177e4 | 861 | goto err_out2; |
3d54b82f | 862 | } |
1da177e4 | 863 | |
ffc8fefa PM |
864 | sch->parent = parent; |
865 | ||
3d54b82f | 866 | if (handle == TC_H_INGRESS) { |
1da177e4 | 867 | sch->flags |= TCQ_F_INGRESS; |
3d54b82f | 868 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
25bfcd5a | 869 | lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); |
fd44de7c | 870 | } else { |
fd44de7c PM |
871 | if (handle == 0) { |
872 | handle = qdisc_alloc_handle(dev); | |
873 | err = -ENOMEM; | |
874 | if (handle == 0) | |
875 | goto err_out3; | |
876 | } | |
25bfcd5a | 877 | lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); |
1abbe139 ED |
878 | if (!netif_is_multiqueue(dev)) |
879 | sch->flags |= TCQ_F_ONETXQUEUE; | |
1da177e4 LT |
880 | } |
881 | ||
3d54b82f | 882 | sch->handle = handle; |
1da177e4 | 883 | |
1e90474c | 884 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
175f9c1b JK |
885 | if (tca[TCA_STAB]) { |
886 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
887 | if (IS_ERR(stab)) { | |
888 | err = PTR_ERR(stab); | |
7c64b9f3 | 889 | goto err_out4; |
175f9c1b | 890 | } |
a2da570d | 891 | rcu_assign_pointer(sch->stab, stab); |
175f9c1b | 892 | } |
1e90474c | 893 | if (tca[TCA_RATE]) { |
f6f9b93f JP |
894 | spinlock_t *root_lock; |
895 | ||
23bcf634 PM |
896 | err = -EOPNOTSUPP; |
897 | if (sch->flags & TCQ_F_MQROOT) | |
898 | goto err_out4; | |
899 | ||
f6f9b93f | 900 | if ((sch->parent != TC_H_ROOT) && |
23bcf634 PM |
901 | !(sch->flags & TCQ_F_INGRESS) && |
902 | (!p || !(p->flags & TCQ_F_MQROOT))) | |
f6f9b93f JP |
903 | root_lock = qdisc_root_sleeping_lock(sch); |
904 | else | |
905 | root_lock = qdisc_lock(sch); | |
906 | ||
023e09a7 | 907 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
f6f9b93f | 908 | root_lock, tca[TCA_RATE]); |
23bcf634 PM |
909 | if (err) |
910 | goto err_out4; | |
023e09a7 | 911 | } |
f6e0b239 JP |
912 | |
913 | qdisc_list_add(sch); | |
1da177e4 | 914 | |
1da177e4 LT |
915 | return sch; |
916 | } | |
917 | err_out3: | |
918 | dev_put(dev); | |
3d54b82f | 919 | kfree((char *) sch - sch->padded); |
1da177e4 LT |
920 | err_out2: |
921 | module_put(ops->owner); | |
922 | err_out: | |
923 | *errp = err; | |
1da177e4 | 924 | return NULL; |
23bcf634 PM |
925 | |
926 | err_out4: | |
927 | /* | |
928 | * Any broken qdiscs that would require a ops->reset() here? | |
929 | * The qdisc was never in action so it shouldn't be necessary. | |
930 | */ | |
a2da570d | 931 | qdisc_put_stab(rtnl_dereference(sch->stab)); |
23bcf634 PM |
932 | if (ops->destroy) |
933 | ops->destroy(sch); | |
934 | goto err_out3; | |
1da177e4 LT |
935 | } |
936 | ||
1e90474c | 937 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
1da177e4 | 938 | { |
a2da570d | 939 | struct qdisc_size_table *ostab, *stab = NULL; |
175f9c1b | 940 | int err = 0; |
1da177e4 | 941 | |
175f9c1b | 942 | if (tca[TCA_OPTIONS]) { |
1da177e4 LT |
943 | if (sch->ops->change == NULL) |
944 | return -EINVAL; | |
1e90474c | 945 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
1da177e4 LT |
946 | if (err) |
947 | return err; | |
948 | } | |
175f9c1b JK |
949 | |
950 | if (tca[TCA_STAB]) { | |
951 | stab = qdisc_get_stab(tca[TCA_STAB]); | |
952 | if (IS_ERR(stab)) | |
953 | return PTR_ERR(stab); | |
954 | } | |
955 | ||
a2da570d ED |
956 | ostab = rtnl_dereference(sch->stab); |
957 | rcu_assign_pointer(sch->stab, stab); | |
958 | qdisc_put_stab(ostab); | |
175f9c1b | 959 | |
23bcf634 | 960 | if (tca[TCA_RATE]) { |
71bcb09a SH |
961 | /* NB: ignores errors from replace_estimator |
962 | because change can't be undone. */ | |
23bcf634 PM |
963 | if (sch->flags & TCQ_F_MQROOT) |
964 | goto out; | |
1da177e4 | 965 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
71bcb09a SH |
966 | qdisc_root_sleeping_lock(sch), |
967 | tca[TCA_RATE]); | |
23bcf634 PM |
968 | } |
969 | out: | |
1da177e4 LT |
970 | return 0; |
971 | } | |
972 | ||
cc7ec456 ED |
973 | struct check_loop_arg { |
974 | struct qdisc_walker w; | |
1da177e4 LT |
975 | struct Qdisc *p; |
976 | int depth; | |
977 | }; | |
978 | ||
979 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); | |
980 | ||
981 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) | |
982 | { | |
983 | struct check_loop_arg arg; | |
984 | ||
985 | if (q->ops->cl_ops == NULL) | |
986 | return 0; | |
987 | ||
988 | arg.w.stop = arg.w.skip = arg.w.count = 0; | |
989 | arg.w.fn = check_loop_fn; | |
990 | arg.depth = depth; | |
991 | arg.p = p; | |
992 | q->ops->cl_ops->walk(q, &arg.w); | |
993 | return arg.w.stop ? -ELOOP : 0; | |
994 | } | |
995 | ||
996 | static int | |
997 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) | |
998 | { | |
999 | struct Qdisc *leaf; | |
20fea08b | 1000 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
1da177e4 LT |
1001 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
1002 | ||
1003 | leaf = cops->leaf(q, cl); | |
1004 | if (leaf) { | |
1005 | if (leaf == arg->p || arg->depth > 7) | |
1006 | return -ELOOP; | |
1007 | return check_loop(leaf, arg->p, arg->depth + 1); | |
1008 | } | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * Delete/get qdisc. | |
1014 | */ | |
1015 | ||
661d2967 | 1016 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1017 | { |
3b1e0a65 | 1018 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1019 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1020 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 | 1021 | struct net_device *dev; |
de179c8c | 1022 | u32 clid; |
1da177e4 LT |
1023 | struct Qdisc *q = NULL; |
1024 | struct Qdisc *p = NULL; | |
1025 | int err; | |
1026 | ||
dfc47ef8 EB |
1027 | if ((n->nlmsg_type != RTM_GETQDISC) && !capable(CAP_NET_ADMIN)) |
1028 | return -EPERM; | |
1029 | ||
1e90474c PM |
1030 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1031 | if (err < 0) | |
1032 | return err; | |
1033 | ||
de179c8c H |
1034 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1035 | if (!dev) | |
1036 | return -ENODEV; | |
1037 | ||
1038 | clid = tcm->tcm_parent; | |
1da177e4 LT |
1039 | if (clid) { |
1040 | if (clid != TC_H_ROOT) { | |
1041 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { | |
cc7ec456 ED |
1042 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1043 | if (!p) | |
1da177e4 LT |
1044 | return -ENOENT; |
1045 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1046 | } else if (dev_ingress_queue(dev)) { |
1047 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
10297b99 | 1048 | } |
1da177e4 | 1049 | } else { |
af356afa | 1050 | q = dev->qdisc; |
1da177e4 LT |
1051 | } |
1052 | if (!q) | |
1053 | return -ENOENT; | |
1054 | ||
1055 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) | |
1056 | return -EINVAL; | |
1057 | } else { | |
cc7ec456 ED |
1058 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1059 | if (!q) | |
1da177e4 LT |
1060 | return -ENOENT; |
1061 | } | |
1062 | ||
1e90474c | 1063 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1064 | return -EINVAL; |
1065 | ||
1066 | if (n->nlmsg_type == RTM_DELQDISC) { | |
1067 | if (!clid) | |
1068 | return -EINVAL; | |
1069 | if (q->handle == 0) | |
1070 | return -ENOENT; | |
cc7ec456 ED |
1071 | err = qdisc_graft(dev, p, skb, n, clid, NULL, q); |
1072 | if (err != 0) | |
1da177e4 | 1073 | return err; |
1da177e4 | 1074 | } else { |
7316ae88 | 1075 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1076 | } |
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | /* | |
cc7ec456 | 1081 | * Create/change qdisc. |
1da177e4 LT |
1082 | */ |
1083 | ||
661d2967 | 1084 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1085 | { |
3b1e0a65 | 1086 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1087 | struct tcmsg *tcm; |
1e90474c | 1088 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1089 | struct net_device *dev; |
1090 | u32 clid; | |
1091 | struct Qdisc *q, *p; | |
1092 | int err; | |
1093 | ||
dfc47ef8 EB |
1094 | if (!capable(CAP_NET_ADMIN)) |
1095 | return -EPERM; | |
1096 | ||
1da177e4 LT |
1097 | replay: |
1098 | /* Reinit, just in case something touches this. */ | |
de179c8c H |
1099 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1100 | if (err < 0) | |
1101 | return err; | |
1102 | ||
02ef22ca | 1103 | tcm = nlmsg_data(n); |
1da177e4 LT |
1104 | clid = tcm->tcm_parent; |
1105 | q = p = NULL; | |
1106 | ||
cc7ec456 ED |
1107 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1108 | if (!dev) | |
1da177e4 LT |
1109 | return -ENODEV; |
1110 | ||
1e90474c | 1111 | |
1da177e4 LT |
1112 | if (clid) { |
1113 | if (clid != TC_H_ROOT) { | |
1114 | if (clid != TC_H_INGRESS) { | |
cc7ec456 ED |
1115 | p = qdisc_lookup(dev, TC_H_MAJ(clid)); |
1116 | if (!p) | |
1da177e4 LT |
1117 | return -ENOENT; |
1118 | q = qdisc_leaf(p, clid); | |
cc7ec456 ED |
1119 | } else if (dev_ingress_queue_create(dev)) { |
1120 | q = dev_ingress_queue(dev)->qdisc_sleeping; | |
1da177e4 LT |
1121 | } |
1122 | } else { | |
af356afa | 1123 | q = dev->qdisc; |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | /* It may be default qdisc, ignore it */ | |
1127 | if (q && q->handle == 0) | |
1128 | q = NULL; | |
1129 | ||
1130 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { | |
1131 | if (tcm->tcm_handle) { | |
cc7ec456 | 1132 | if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) |
1da177e4 LT |
1133 | return -EEXIST; |
1134 | if (TC_H_MIN(tcm->tcm_handle)) | |
1135 | return -EINVAL; | |
cc7ec456 ED |
1136 | q = qdisc_lookup(dev, tcm->tcm_handle); |
1137 | if (!q) | |
1da177e4 | 1138 | goto create_n_graft; |
cc7ec456 | 1139 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1140 | return -EEXIST; |
1e90474c | 1141 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1142 | return -EINVAL; |
1143 | if (q == p || | |
1144 | (p && check_loop(q, p, 0))) | |
1145 | return -ELOOP; | |
1146 | atomic_inc(&q->refcnt); | |
1147 | goto graft; | |
1148 | } else { | |
cc7ec456 | 1149 | if (!q) |
1da177e4 LT |
1150 | goto create_n_graft; |
1151 | ||
1152 | /* This magic test requires explanation. | |
1153 | * | |
1154 | * We know, that some child q is already | |
1155 | * attached to this parent and have choice: | |
1156 | * either to change it or to create/graft new one. | |
1157 | * | |
1158 | * 1. We are allowed to create/graft only | |
1159 | * if CREATE and REPLACE flags are set. | |
1160 | * | |
1161 | * 2. If EXCL is set, requestor wanted to say, | |
1162 | * that qdisc tcm_handle is not expected | |
1163 | * to exist, so that we choose create/graft too. | |
1164 | * | |
1165 | * 3. The last case is when no flags are set. | |
1166 | * Alas, it is sort of hole in API, we | |
1167 | * cannot decide what to do unambiguously. | |
1168 | * For now we select create/graft, if | |
1169 | * user gave KIND, which does not match existing. | |
1170 | */ | |
cc7ec456 ED |
1171 | if ((n->nlmsg_flags & NLM_F_CREATE) && |
1172 | (n->nlmsg_flags & NLM_F_REPLACE) && | |
1173 | ((n->nlmsg_flags & NLM_F_EXCL) || | |
1e90474c PM |
1174 | (tca[TCA_KIND] && |
1175 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) | |
1da177e4 LT |
1176 | goto create_n_graft; |
1177 | } | |
1178 | } | |
1179 | } else { | |
1180 | if (!tcm->tcm_handle) | |
1181 | return -EINVAL; | |
1182 | q = qdisc_lookup(dev, tcm->tcm_handle); | |
1183 | } | |
1184 | ||
1185 | /* Change qdisc parameters */ | |
1186 | if (q == NULL) | |
1187 | return -ENOENT; | |
cc7ec456 | 1188 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 | 1189 | return -EEXIST; |
1e90474c | 1190 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
1da177e4 LT |
1191 | return -EINVAL; |
1192 | err = qdisc_change(q, tca); | |
1193 | if (err == 0) | |
7316ae88 | 1194 | qdisc_notify(net, skb, n, clid, NULL, q); |
1da177e4 LT |
1195 | return err; |
1196 | ||
1197 | create_n_graft: | |
cc7ec456 | 1198 | if (!(n->nlmsg_flags & NLM_F_CREATE)) |
1da177e4 | 1199 | return -ENOENT; |
24824a09 ED |
1200 | if (clid == TC_H_INGRESS) { |
1201 | if (dev_ingress_queue(dev)) | |
1202 | q = qdisc_create(dev, dev_ingress_queue(dev), p, | |
1203 | tcm->tcm_parent, tcm->tcm_parent, | |
1204 | tca, &err); | |
1205 | else | |
1206 | err = -ENOENT; | |
1207 | } else { | |
926e61b7 | 1208 | struct netdev_queue *dev_queue; |
6ec1c69a DM |
1209 | |
1210 | if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue) | |
926e61b7 JP |
1211 | dev_queue = p->ops->cl_ops->select_queue(p, tcm); |
1212 | else if (p) | |
1213 | dev_queue = p->dev_queue; | |
1214 | else | |
1215 | dev_queue = netdev_get_tx_queue(dev, 0); | |
6ec1c69a | 1216 | |
926e61b7 | 1217 | q = qdisc_create(dev, dev_queue, p, |
bb949fbd | 1218 | tcm->tcm_parent, tcm->tcm_handle, |
ffc8fefa | 1219 | tca, &err); |
6ec1c69a | 1220 | } |
1da177e4 LT |
1221 | if (q == NULL) { |
1222 | if (err == -EAGAIN) | |
1223 | goto replay; | |
1224 | return err; | |
1225 | } | |
1226 | ||
1227 | graft: | |
e5befbd9 IJ |
1228 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
1229 | if (err) { | |
1230 | if (q) | |
1231 | qdisc_destroy(q); | |
1232 | return err; | |
1da177e4 | 1233 | } |
e5befbd9 | 1234 | |
1da177e4 LT |
1235 | return 0; |
1236 | } | |
1237 | ||
1238 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, | |
15e47304 | 1239 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1240 | { |
1241 | struct tcmsg *tcm; | |
1242 | struct nlmsghdr *nlh; | |
27a884dc | 1243 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1244 | struct gnet_dump d; |
a2da570d | 1245 | struct qdisc_size_table *stab; |
1da177e4 | 1246 | |
15e47304 | 1247 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1248 | if (!nlh) |
1249 | goto out_nlmsg_trim; | |
1250 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1251 | tcm->tcm_family = AF_UNSPEC; |
9ef1d4c7 PM |
1252 | tcm->tcm__pad1 = 0; |
1253 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1254 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1255 | tcm->tcm_parent = clid; |
1256 | tcm->tcm_handle = q->handle; | |
1257 | tcm->tcm_info = atomic_read(&q->refcnt); | |
1b34ec43 DM |
1258 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1259 | goto nla_put_failure; | |
1da177e4 | 1260 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
1e90474c | 1261 | goto nla_put_failure; |
1da177e4 LT |
1262 | q->qstats.qlen = q->q.qlen; |
1263 | ||
a2da570d ED |
1264 | stab = rtnl_dereference(q->stab); |
1265 | if (stab && qdisc_dump_stab(skb, stab) < 0) | |
175f9c1b JK |
1266 | goto nla_put_failure; |
1267 | ||
102396ae JP |
1268 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1269 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1270 | goto nla_put_failure; |
1da177e4 LT |
1271 | |
1272 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) | |
1e90474c | 1273 | goto nla_put_failure; |
1da177e4 LT |
1274 | |
1275 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || | |
d250a5f9 | 1276 | gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || |
1da177e4 | 1277 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
1e90474c | 1278 | goto nla_put_failure; |
10297b99 | 1279 | |
1da177e4 | 1280 | if (gnet_stats_finish_copy(&d) < 0) |
1e90474c | 1281 | goto nla_put_failure; |
10297b99 | 1282 | |
27a884dc | 1283 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1284 | return skb->len; |
1285 | ||
02ef22ca | 1286 | out_nlmsg_trim: |
1e90474c | 1287 | nla_put_failure: |
dc5fc579 | 1288 | nlmsg_trim(skb, b); |
1da177e4 LT |
1289 | return -1; |
1290 | } | |
1291 | ||
53b0f080 ED |
1292 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
1293 | { | |
1294 | return (q->flags & TCQ_F_BUILTIN) ? true : false; | |
1295 | } | |
1296 | ||
7316ae88 TG |
1297 | static int qdisc_notify(struct net *net, struct sk_buff *oskb, |
1298 | struct nlmsghdr *n, u32 clid, | |
1299 | struct Qdisc *old, struct Qdisc *new) | |
1da177e4 LT |
1300 | { |
1301 | struct sk_buff *skb; | |
15e47304 | 1302 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1303 | |
1304 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1305 | if (!skb) | |
1306 | return -ENOBUFS; | |
1307 | ||
53b0f080 | 1308 | if (old && !tc_qdisc_dump_ignore(old)) { |
15e47304 | 1309 | if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1310 | 0, RTM_DELQDISC) < 0) |
1da177e4 LT |
1311 | goto err_out; |
1312 | } | |
53b0f080 | 1313 | if (new && !tc_qdisc_dump_ignore(new)) { |
15e47304 | 1314 | if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq, |
cc7ec456 | 1315 | old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
1da177e4 LT |
1316 | goto err_out; |
1317 | } | |
1318 | ||
1319 | if (skb->len) | |
15e47304 | 1320 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1321 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1322 | |
1323 | err_out: | |
1324 | kfree_skb(skb); | |
1325 | return -EINVAL; | |
1326 | } | |
1327 | ||
30723673 DM |
1328 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
1329 | struct netlink_callback *cb, | |
1330 | int *q_idx_p, int s_q_idx) | |
1331 | { | |
1332 | int ret = 0, q_idx = *q_idx_p; | |
1333 | struct Qdisc *q; | |
1334 | ||
1335 | if (!root) | |
1336 | return 0; | |
1337 | ||
1338 | q = root; | |
1339 | if (q_idx < s_q_idx) { | |
1340 | q_idx++; | |
1341 | } else { | |
1342 | if (!tc_qdisc_dump_ignore(q) && | |
15e47304 | 1343 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1344 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1345 | goto done; | |
1346 | q_idx++; | |
1347 | } | |
1348 | list_for_each_entry(q, &root->list, list) { | |
1349 | if (q_idx < s_q_idx) { | |
1350 | q_idx++; | |
1351 | continue; | |
1352 | } | |
cc7ec456 | 1353 | if (!tc_qdisc_dump_ignore(q) && |
15e47304 | 1354 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid, |
30723673 DM |
1355 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
1356 | goto done; | |
1357 | q_idx++; | |
1358 | } | |
1359 | ||
1360 | out: | |
1361 | *q_idx_p = q_idx; | |
1362 | return ret; | |
1363 | done: | |
1364 | ret = -1; | |
1365 | goto out; | |
1366 | } | |
1367 | ||
1da177e4 LT |
1368 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
1369 | { | |
3b1e0a65 | 1370 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1371 | int idx, q_idx; |
1372 | int s_idx, s_q_idx; | |
1373 | struct net_device *dev; | |
1da177e4 LT |
1374 | |
1375 | s_idx = cb->args[0]; | |
1376 | s_q_idx = q_idx = cb->args[1]; | |
f1e9016d | 1377 | |
1378 | rcu_read_lock(); | |
7562f876 | 1379 | idx = 0; |
7316ae88 | 1380 | for_each_netdev_rcu(net, dev) { |
30723673 DM |
1381 | struct netdev_queue *dev_queue; |
1382 | ||
1da177e4 | 1383 | if (idx < s_idx) |
7562f876 | 1384 | goto cont; |
1da177e4 LT |
1385 | if (idx > s_idx) |
1386 | s_q_idx = 0; | |
1da177e4 | 1387 | q_idx = 0; |
30723673 | 1388 | |
af356afa | 1389 | if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0) |
30723673 DM |
1390 | goto done; |
1391 | ||
24824a09 ED |
1392 | dev_queue = dev_ingress_queue(dev); |
1393 | if (dev_queue && | |
1394 | tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, | |
1395 | &q_idx, s_q_idx) < 0) | |
30723673 DM |
1396 | goto done; |
1397 | ||
7562f876 PE |
1398 | cont: |
1399 | idx++; | |
1da177e4 LT |
1400 | } |
1401 | ||
1402 | done: | |
f1e9016d | 1403 | rcu_read_unlock(); |
1da177e4 LT |
1404 | |
1405 | cb->args[0] = idx; | |
1406 | cb->args[1] = q_idx; | |
1407 | ||
1408 | return skb->len; | |
1409 | } | |
1410 | ||
1411 | ||
1412 | ||
1413 | /************************************************ | |
1414 | * Traffic classes manipulation. * | |
1415 | ************************************************/ | |
1416 | ||
1417 | ||
1418 | ||
661d2967 | 1419 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 1420 | { |
3b1e0a65 | 1421 | struct net *net = sock_net(skb->sk); |
02ef22ca | 1422 | struct tcmsg *tcm = nlmsg_data(n); |
1e90474c | 1423 | struct nlattr *tca[TCA_MAX + 1]; |
1da177e4 LT |
1424 | struct net_device *dev; |
1425 | struct Qdisc *q = NULL; | |
20fea08b | 1426 | const struct Qdisc_class_ops *cops; |
1da177e4 LT |
1427 | unsigned long cl = 0; |
1428 | unsigned long new_cl; | |
de179c8c H |
1429 | u32 portid; |
1430 | u32 clid; | |
1431 | u32 qid; | |
1da177e4 LT |
1432 | int err; |
1433 | ||
dfc47ef8 EB |
1434 | if ((n->nlmsg_type != RTM_GETTCLASS) && !capable(CAP_NET_ADMIN)) |
1435 | return -EPERM; | |
1436 | ||
1e90474c PM |
1437 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
1438 | if (err < 0) | |
1439 | return err; | |
1440 | ||
de179c8c H |
1441 | dev = __dev_get_by_index(net, tcm->tcm_ifindex); |
1442 | if (!dev) | |
1443 | return -ENODEV; | |
1444 | ||
1da177e4 LT |
1445 | /* |
1446 | parent == TC_H_UNSPEC - unspecified parent. | |
1447 | parent == TC_H_ROOT - class is root, which has no parent. | |
1448 | parent == X:0 - parent is root class. | |
1449 | parent == X:Y - parent is a node in hierarchy. | |
1450 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. | |
1451 | ||
1452 | handle == 0:0 - generate handle from kernel pool. | |
1453 | handle == 0:Y - class is X:Y, where X:0 is qdisc. | |
1454 | handle == X:Y - clear. | |
1455 | handle == X:0 - root class. | |
1456 | */ | |
1457 | ||
1458 | /* Step 1. Determine qdisc handle X:0 */ | |
1459 | ||
de179c8c H |
1460 | portid = tcm->tcm_parent; |
1461 | clid = tcm->tcm_handle; | |
1462 | qid = TC_H_MAJ(clid); | |
1463 | ||
15e47304 EB |
1464 | if (portid != TC_H_ROOT) { |
1465 | u32 qid1 = TC_H_MAJ(portid); | |
1da177e4 LT |
1466 | |
1467 | if (qid && qid1) { | |
1468 | /* If both majors are known, they must be identical. */ | |
1469 | if (qid != qid1) | |
1470 | return -EINVAL; | |
1471 | } else if (qid1) { | |
1472 | qid = qid1; | |
1473 | } else if (qid == 0) | |
af356afa | 1474 | qid = dev->qdisc->handle; |
1da177e4 LT |
1475 | |
1476 | /* Now qid is genuine qdisc handle consistent | |
cc7ec456 ED |
1477 | * both with parent and child. |
1478 | * | |
15e47304 | 1479 | * TC_H_MAJ(portid) still may be unspecified, complete it now. |
1da177e4 | 1480 | */ |
15e47304 EB |
1481 | if (portid) |
1482 | portid = TC_H_MAKE(qid, portid); | |
1da177e4 LT |
1483 | } else { |
1484 | if (qid == 0) | |
af356afa | 1485 | qid = dev->qdisc->handle; |
1da177e4 LT |
1486 | } |
1487 | ||
1488 | /* OK. Locate qdisc */ | |
cc7ec456 ED |
1489 | q = qdisc_lookup(dev, qid); |
1490 | if (!q) | |
1da177e4 LT |
1491 | return -ENOENT; |
1492 | ||
1493 | /* An check that it supports classes */ | |
1494 | cops = q->ops->cl_ops; | |
1495 | if (cops == NULL) | |
1496 | return -EINVAL; | |
1497 | ||
1498 | /* Now try to get class */ | |
1499 | if (clid == 0) { | |
15e47304 | 1500 | if (portid == TC_H_ROOT) |
1da177e4 LT |
1501 | clid = qid; |
1502 | } else | |
1503 | clid = TC_H_MAKE(qid, clid); | |
1504 | ||
1505 | if (clid) | |
1506 | cl = cops->get(q, clid); | |
1507 | ||
1508 | if (cl == 0) { | |
1509 | err = -ENOENT; | |
cc7ec456 ED |
1510 | if (n->nlmsg_type != RTM_NEWTCLASS || |
1511 | !(n->nlmsg_flags & NLM_F_CREATE)) | |
1da177e4 LT |
1512 | goto out; |
1513 | } else { | |
1514 | switch (n->nlmsg_type) { | |
10297b99 | 1515 | case RTM_NEWTCLASS: |
1da177e4 | 1516 | err = -EEXIST; |
cc7ec456 | 1517 | if (n->nlmsg_flags & NLM_F_EXCL) |
1da177e4 LT |
1518 | goto out; |
1519 | break; | |
1520 | case RTM_DELTCLASS: | |
de6d5cdf PM |
1521 | err = -EOPNOTSUPP; |
1522 | if (cops->delete) | |
1523 | err = cops->delete(q, cl); | |
1da177e4 | 1524 | if (err == 0) |
7316ae88 | 1525 | tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); |
1da177e4 LT |
1526 | goto out; |
1527 | case RTM_GETTCLASS: | |
7316ae88 | 1528 | err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); |
1da177e4 LT |
1529 | goto out; |
1530 | default: | |
1531 | err = -EINVAL; | |
1532 | goto out; | |
1533 | } | |
1534 | } | |
1535 | ||
1536 | new_cl = cl; | |
de6d5cdf PM |
1537 | err = -EOPNOTSUPP; |
1538 | if (cops->change) | |
15e47304 | 1539 | err = cops->change(q, clid, portid, tca, &new_cl); |
1da177e4 | 1540 | if (err == 0) |
7316ae88 | 1541 | tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); |
1da177e4 LT |
1542 | |
1543 | out: | |
1544 | if (cl) | |
1545 | cops->put(q, cl); | |
1546 | ||
1547 | return err; | |
1548 | } | |
1549 | ||
1550 | ||
1551 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, | |
1552 | unsigned long cl, | |
15e47304 | 1553 | u32 portid, u32 seq, u16 flags, int event) |
1da177e4 LT |
1554 | { |
1555 | struct tcmsg *tcm; | |
1556 | struct nlmsghdr *nlh; | |
27a884dc | 1557 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 | 1558 | struct gnet_dump d; |
20fea08b | 1559 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
1da177e4 | 1560 | |
15e47304 | 1561 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags); |
02ef22ca DM |
1562 | if (!nlh) |
1563 | goto out_nlmsg_trim; | |
1564 | tcm = nlmsg_data(nlh); | |
1da177e4 | 1565 | tcm->tcm_family = AF_UNSPEC; |
16ebb5e0 ED |
1566 | tcm->tcm__pad1 = 0; |
1567 | tcm->tcm__pad2 = 0; | |
5ce2d488 | 1568 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
1da177e4 LT |
1569 | tcm->tcm_parent = q->handle; |
1570 | tcm->tcm_handle = q->handle; | |
1571 | tcm->tcm_info = 0; | |
1b34ec43 DM |
1572 | if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
1573 | goto nla_put_failure; | |
1da177e4 | 1574 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
1e90474c | 1575 | goto nla_put_failure; |
1da177e4 | 1576 | |
102396ae JP |
1577 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS, |
1578 | qdisc_root_sleeping_lock(q), &d) < 0) | |
1e90474c | 1579 | goto nla_put_failure; |
1da177e4 LT |
1580 | |
1581 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) | |
1e90474c | 1582 | goto nla_put_failure; |
1da177e4 LT |
1583 | |
1584 | if (gnet_stats_finish_copy(&d) < 0) | |
1e90474c | 1585 | goto nla_put_failure; |
1da177e4 | 1586 | |
27a884dc | 1587 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1588 | return skb->len; |
1589 | ||
02ef22ca | 1590 | out_nlmsg_trim: |
1e90474c | 1591 | nla_put_failure: |
dc5fc579 | 1592 | nlmsg_trim(skb, b); |
1da177e4 LT |
1593 | return -1; |
1594 | } | |
1595 | ||
7316ae88 TG |
1596 | static int tclass_notify(struct net *net, struct sk_buff *oskb, |
1597 | struct nlmsghdr *n, struct Qdisc *q, | |
1598 | unsigned long cl, int event) | |
1da177e4 LT |
1599 | { |
1600 | struct sk_buff *skb; | |
15e47304 | 1601 | u32 portid = oskb ? NETLINK_CB(oskb).portid : 0; |
1da177e4 LT |
1602 | |
1603 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1604 | if (!skb) | |
1605 | return -ENOBUFS; | |
1606 | ||
15e47304 | 1607 | if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) { |
1da177e4 LT |
1608 | kfree_skb(skb); |
1609 | return -EINVAL; | |
1610 | } | |
1611 | ||
15e47304 | 1612 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1613 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1614 | } |
1615 | ||
cc7ec456 ED |
1616 | struct qdisc_dump_args { |
1617 | struct qdisc_walker w; | |
1618 | struct sk_buff *skb; | |
1619 | struct netlink_callback *cb; | |
1da177e4 LT |
1620 | }; |
1621 | ||
1622 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) | |
1623 | { | |
1624 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; | |
1625 | ||
15e47304 | 1626 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid, |
1da177e4 LT |
1627 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); |
1628 | } | |
1629 | ||
30723673 DM |
1630 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
1631 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1632 | int *t_p, int s_t) | |
1633 | { | |
1634 | struct qdisc_dump_args arg; | |
1635 | ||
1636 | if (tc_qdisc_dump_ignore(q) || | |
1637 | *t_p < s_t || !q->ops->cl_ops || | |
1638 | (tcm->tcm_parent && | |
1639 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { | |
1640 | (*t_p)++; | |
1641 | return 0; | |
1642 | } | |
1643 | if (*t_p > s_t) | |
1644 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); | |
1645 | arg.w.fn = qdisc_class_dump; | |
1646 | arg.skb = skb; | |
1647 | arg.cb = cb; | |
1648 | arg.w.stop = 0; | |
1649 | arg.w.skip = cb->args[1]; | |
1650 | arg.w.count = 0; | |
1651 | q->ops->cl_ops->walk(q, &arg.w); | |
1652 | cb->args[1] = arg.w.count; | |
1653 | if (arg.w.stop) | |
1654 | return -1; | |
1655 | (*t_p)++; | |
1656 | return 0; | |
1657 | } | |
1658 | ||
1659 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, | |
1660 | struct tcmsg *tcm, struct netlink_callback *cb, | |
1661 | int *t_p, int s_t) | |
1662 | { | |
1663 | struct Qdisc *q; | |
1664 | ||
1665 | if (!root) | |
1666 | return 0; | |
1667 | ||
1668 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) | |
1669 | return -1; | |
1670 | ||
1671 | list_for_each_entry(q, &root->list, list) { | |
1672 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) | |
1673 | return -1; | |
1674 | } | |
1675 | ||
1676 | return 0; | |
1677 | } | |
1678 | ||
1da177e4 LT |
1679 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
1680 | { | |
02ef22ca | 1681 | struct tcmsg *tcm = nlmsg_data(cb->nlh); |
3b1e0a65 | 1682 | struct net *net = sock_net(skb->sk); |
30723673 | 1683 | struct netdev_queue *dev_queue; |
1da177e4 | 1684 | struct net_device *dev; |
30723673 | 1685 | int t, s_t; |
1da177e4 | 1686 | |
573ce260 | 1687 | if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
1da177e4 | 1688 | return 0; |
cc7ec456 ED |
1689 | dev = dev_get_by_index(net, tcm->tcm_ifindex); |
1690 | if (!dev) | |
1da177e4 LT |
1691 | return 0; |
1692 | ||
1693 | s_t = cb->args[0]; | |
1694 | t = 0; | |
1695 | ||
af356afa | 1696 | if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
30723673 DM |
1697 | goto done; |
1698 | ||
24824a09 ED |
1699 | dev_queue = dev_ingress_queue(dev); |
1700 | if (dev_queue && | |
1701 | tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, | |
1702 | &t, s_t) < 0) | |
30723673 | 1703 | goto done; |
1da177e4 | 1704 | |
30723673 | 1705 | done: |
1da177e4 LT |
1706 | cb->args[0] = t; |
1707 | ||
1708 | dev_put(dev); | |
1709 | return skb->len; | |
1710 | } | |
1711 | ||
1712 | /* Main classifier routine: scans classifier chain attached | |
cc7ec456 ED |
1713 | * to this qdisc, (optionally) tests for protocol and asks |
1714 | * specific classifiers. | |
1da177e4 | 1715 | */ |
dc7f9f6e | 1716 | int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp, |
73ca4918 PM |
1717 | struct tcf_result *res) |
1718 | { | |
1719 | __be16 protocol = skb->protocol; | |
cc7ec456 | 1720 | int err; |
73ca4918 PM |
1721 | |
1722 | for (; tp; tp = tp->next) { | |
cc7ec456 ED |
1723 | if (tp->protocol != protocol && |
1724 | tp->protocol != htons(ETH_P_ALL)) | |
1725 | continue; | |
1726 | err = tp->classify(skb, tp, res); | |
1727 | ||
1728 | if (err >= 0) { | |
73ca4918 PM |
1729 | #ifdef CONFIG_NET_CLS_ACT |
1730 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) | |
1731 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); | |
1732 | #endif | |
1733 | return err; | |
1734 | } | |
1735 | } | |
1736 | return -1; | |
1737 | } | |
1738 | EXPORT_SYMBOL(tc_classify_compat); | |
1739 | ||
dc7f9f6e | 1740 | int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
73ca4918 | 1741 | struct tcf_result *res) |
1da177e4 LT |
1742 | { |
1743 | int err = 0; | |
1da177e4 | 1744 | #ifdef CONFIG_NET_CLS_ACT |
dc7f9f6e | 1745 | const struct tcf_proto *otp = tp; |
1da177e4 | 1746 | reclassify: |
52bc9747 | 1747 | #endif |
1da177e4 | 1748 | |
73ca4918 | 1749 | err = tc_classify_compat(skb, tp, res); |
1da177e4 | 1750 | #ifdef CONFIG_NET_CLS_ACT |
73ca4918 PM |
1751 | if (err == TC_ACT_RECLASSIFY) { |
1752 | u32 verd = G_TC_VERD(skb->tc_verd); | |
1753 | tp = otp; | |
1754 | ||
1755 | if (verd++ >= MAX_REC_LOOP) { | |
e87cc472 JP |
1756 | net_notice_ratelimited("%s: packet reclassify loop rule prio %u protocol %02x\n", |
1757 | tp->q->ops->id, | |
1758 | tp->prio & 0xffff, | |
1759 | ntohs(tp->protocol)); | |
73ca4918 | 1760 | return TC_ACT_SHOT; |
1da177e4 | 1761 | } |
73ca4918 PM |
1762 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
1763 | goto reclassify; | |
1da177e4 | 1764 | } |
73ca4918 PM |
1765 | #endif |
1766 | return err; | |
1da177e4 | 1767 | } |
73ca4918 | 1768 | EXPORT_SYMBOL(tc_classify); |
1da177e4 | 1769 | |
a48b5a61 PM |
1770 | void tcf_destroy(struct tcf_proto *tp) |
1771 | { | |
1772 | tp->ops->destroy(tp); | |
1773 | module_put(tp->ops->owner); | |
1774 | kfree(tp); | |
1775 | } | |
1776 | ||
ff31ab56 | 1777 | void tcf_destroy_chain(struct tcf_proto **fl) |
a48b5a61 PM |
1778 | { |
1779 | struct tcf_proto *tp; | |
1780 | ||
ff31ab56 PM |
1781 | while ((tp = *fl) != NULL) { |
1782 | *fl = tp->next; | |
a48b5a61 PM |
1783 | tcf_destroy(tp); |
1784 | } | |
1785 | } | |
1786 | EXPORT_SYMBOL(tcf_destroy_chain); | |
1787 | ||
1da177e4 LT |
1788 | #ifdef CONFIG_PROC_FS |
1789 | static int psched_show(struct seq_file *seq, void *v) | |
1790 | { | |
3c0cfc13 PM |
1791 | struct timespec ts; |
1792 | ||
1793 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); | |
1da177e4 | 1794 | seq_printf(seq, "%08x %08x %08x %08x\n", |
ca44d6e6 | 1795 | (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), |
514bca32 | 1796 | 1000000, |
3c0cfc13 | 1797 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
1da177e4 LT |
1798 | |
1799 | return 0; | |
1800 | } | |
1801 | ||
1802 | static int psched_open(struct inode *inode, struct file *file) | |
1803 | { | |
7e5ab157 | 1804 | return single_open(file, psched_show, NULL); |
1da177e4 LT |
1805 | } |
1806 | ||
da7071d7 | 1807 | static const struct file_operations psched_fops = { |
1da177e4 LT |
1808 | .owner = THIS_MODULE, |
1809 | .open = psched_open, | |
1810 | .read = seq_read, | |
1811 | .llseek = seq_lseek, | |
1812 | .release = single_release, | |
10297b99 | 1813 | }; |
7316ae88 TG |
1814 | |
1815 | static int __net_init psched_net_init(struct net *net) | |
1816 | { | |
1817 | struct proc_dir_entry *e; | |
1818 | ||
d4beaa66 | 1819 | e = proc_create("psched", 0, net->proc_net, &psched_fops); |
7316ae88 TG |
1820 | if (e == NULL) |
1821 | return -ENOMEM; | |
1822 | ||
1823 | return 0; | |
1824 | } | |
1825 | ||
1826 | static void __net_exit psched_net_exit(struct net *net) | |
1827 | { | |
ece31ffd | 1828 | remove_proc_entry("psched", net->proc_net); |
7316ae88 TG |
1829 | } |
1830 | #else | |
1831 | static int __net_init psched_net_init(struct net *net) | |
1832 | { | |
1833 | return 0; | |
1834 | } | |
1835 | ||
1836 | static void __net_exit psched_net_exit(struct net *net) | |
1837 | { | |
1838 | } | |
1da177e4 LT |
1839 | #endif |
1840 | ||
7316ae88 TG |
1841 | static struct pernet_operations psched_net_ops = { |
1842 | .init = psched_net_init, | |
1843 | .exit = psched_net_exit, | |
1844 | }; | |
1845 | ||
1da177e4 LT |
1846 | static int __init pktsched_init(void) |
1847 | { | |
7316ae88 TG |
1848 | int err; |
1849 | ||
1850 | err = register_pernet_subsys(&psched_net_ops); | |
1851 | if (err) { | |
cc7ec456 | 1852 | pr_err("pktsched_init: " |
7316ae88 TG |
1853 | "cannot initialize per netns operations\n"); |
1854 | return err; | |
1855 | } | |
1856 | ||
1da177e4 LT |
1857 | register_qdisc(&pfifo_qdisc_ops); |
1858 | register_qdisc(&bfifo_qdisc_ops); | |
57dbb2d8 | 1859 | register_qdisc(&pfifo_head_drop_qdisc_ops); |
6ec1c69a | 1860 | register_qdisc(&mq_qdisc_ops); |
1da177e4 | 1861 | |
c7ac8679 GR |
1862 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL); |
1863 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL); | |
1864 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL); | |
1865 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL); | |
1866 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL); | |
1867 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL); | |
be577ddc | 1868 | |
1da177e4 LT |
1869 | return 0; |
1870 | } | |
1871 | ||
1872 | subsys_initcall(pktsched_init); |