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Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / net / sched / cls_api.c
blob247b7cc20c131b3bc9f97aa5588139d57837ffc7
1 /*
2 * net/sched/cls_api.c Packet classifier 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 * Changes:
12 *
13 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
14 *
15 */
16
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/errno.h>
22 #include <linux/err.h>
23 #include <linux/skbuff.h>
24 #include <linux/init.h>
25 #include <linux/kmod.h>
26 #include <linux/slab.h>
27 #include <linux/idr.h>
28 #include <net/net_namespace.h>
29 #include <net/sock.h>
30 #include <net/netlink.h>
31 #include <net/pkt_sched.h>
32 #include <net/pkt_cls.h>
33
34 /* The list of all installed classifier types */
35 static LIST_HEAD(tcf_proto_base);
36
37 /* Protects list of registered TC modules. It is pure SMP lock. */
38 static DEFINE_RWLOCK(cls_mod_lock);
39
40 /* Find classifier type by string name */
41
42 static const struct tcf_proto_ops *tcf_proto_lookup_ops(const char *kind)
43 {
44 const struct tcf_proto_ops *t, *res = NULL;
45
46 if (kind) {
47 read_lock(&cls_mod_lock);
48 list_for_each_entry(t, &tcf_proto_base, head) {
49 if (strcmp(kind, t->kind) == 0) {
50 if (try_module_get(t->owner))
51 res = t;
52 break;
53 }
54 }
55 read_unlock(&cls_mod_lock);
56 }
57 return res;
58 }
59
60 /* Register(unregister) new classifier type */
61
62 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
63 {
64 struct tcf_proto_ops *t;
65 int rc = -EEXIST;
66
67 write_lock(&cls_mod_lock);
68 list_for_each_entry(t, &tcf_proto_base, head)
69 if (!strcmp(ops->kind, t->kind))
70 goto out;
71
72 list_add_tail(&ops->head, &tcf_proto_base);
73 rc = 0;
74 out:
75 write_unlock(&cls_mod_lock);
76 return rc;
77 }
78 EXPORT_SYMBOL(register_tcf_proto_ops);
79
80 static struct workqueue_struct *tc_filter_wq;
81
82 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
83 {
84 struct tcf_proto_ops *t;
85 int rc = -ENOENT;
86
87 /* Wait for outstanding call_rcu()s, if any, from a
88 * tcf_proto_ops's destroy() handler.
89 */
90 rcu_barrier();
91 flush_workqueue(tc_filter_wq);
92
93 write_lock(&cls_mod_lock);
94 list_for_each_entry(t, &tcf_proto_base, head) {
95 if (t == ops) {
96 list_del(&t->head);
97 rc = 0;
98 break;
99 }
100 }
101 write_unlock(&cls_mod_lock);
102 return rc;
103 }
104 EXPORT_SYMBOL(unregister_tcf_proto_ops);
105
106 bool tcf_queue_work(struct work_struct *work)
107 {
108 return queue_work(tc_filter_wq, work);
109 }
110 EXPORT_SYMBOL(tcf_queue_work);
111
112 /* Select new prio value from the range, managed by kernel. */
113
114 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
115 {
116 u32 first = TC_H_MAKE(0xC0000000U, 0U);
117
118 if (tp)
119 first = tp->prio - 1;
120
121 return TC_H_MAJ(first);
122 }
123
124 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
125 u32 prio, struct tcf_chain *chain,
126 struct netlink_ext_ack *extack)
127 {
128 struct tcf_proto *tp;
129 int err;
130
131 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
132 if (!tp)
133 return ERR_PTR(-ENOBUFS);
134
135 err = -ENOENT;
136 tp->ops = tcf_proto_lookup_ops(kind);
137 if (!tp->ops) {
138 #ifdef CONFIG_MODULES
139 rtnl_unlock();
140 request_module("cls_%s", kind);
141 rtnl_lock();
142 tp->ops = tcf_proto_lookup_ops(kind);
143 /* We dropped the RTNL semaphore in order to perform
144 * the module load. So, even if we succeeded in loading
145 * the module we have to replay the request. We indicate
146 * this using -EAGAIN.
147 */
148 if (tp->ops) {
149 module_put(tp->ops->owner);
150 err = -EAGAIN;
151 } else {
152 NL_SET_ERR_MSG(extack, "TC classifier not found");
153 err = -ENOENT;
154 }
155 goto errout;
156 #endif
157 }
158 tp->classify = tp->ops->classify;
159 tp->protocol = protocol;
160 tp->prio = prio;
161 tp->chain = chain;
162
163 err = tp->ops->init(tp);
164 if (err) {
165 module_put(tp->ops->owner);
166 goto errout;
167 }
168 return tp;
169
170 errout:
171 kfree(tp);
172 return ERR_PTR(err);
173 }
174
175 static void tcf_proto_destroy(struct tcf_proto *tp,
176 struct netlink_ext_ack *extack)
177 {
178 tp->ops->destroy(tp, extack);
179 module_put(tp->ops->owner);
180 kfree_rcu(tp, rcu);
181 }
182
183 struct tcf_filter_chain_list_item {
184 struct list_head list;
185 tcf_chain_head_change_t *chain_head_change;
186 void *chain_head_change_priv;
187 };
188
189 static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
190 u32 chain_index)
191 {
192 struct tcf_chain *chain;
193
194 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
195 if (!chain)
196 return NULL;
197 INIT_LIST_HEAD(&chain->filter_chain_list);
198 list_add_tail(&chain->list, &block->chain_list);
199 chain->block = block;
200 chain->index = chain_index;
201 chain->refcnt = 1;
202 return chain;
203 }
204
205 static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
206 struct tcf_proto *tp_head)
207 {
208 if (item->chain_head_change)
209 item->chain_head_change(tp_head, item->chain_head_change_priv);
210 }
211 static void tcf_chain_head_change(struct tcf_chain *chain,
212 struct tcf_proto *tp_head)
213 {
214 struct tcf_filter_chain_list_item *item;
215
216 list_for_each_entry(item, &chain->filter_chain_list, list)
217 tcf_chain_head_change_item(item, tp_head);
218 }
219
220 static void tcf_chain_flush(struct tcf_chain *chain)
221 {
222 struct tcf_proto *tp = rtnl_dereference(chain->filter_chain);
223
224 tcf_chain_head_change(chain, NULL);
225 while (tp) {
226 RCU_INIT_POINTER(chain->filter_chain, tp->next);
227 tcf_proto_destroy(tp, NULL);
228 tp = rtnl_dereference(chain->filter_chain);
229 tcf_chain_put(chain);
230 }
231 }
232
233 static void tcf_chain_destroy(struct tcf_chain *chain)
234 {
235 struct tcf_block *block = chain->block;
236
237 list_del(&chain->list);
238 kfree(chain);
239 if (list_empty(&block->chain_list))
240 kfree(block);
241 }
242
243 static void tcf_chain_hold(struct tcf_chain *chain)
244 {
245 ++chain->refcnt;
246 }
247
248 struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
249 bool create)
250 {
251 struct tcf_chain *chain;
252
253 list_for_each_entry(chain, &block->chain_list, list) {
254 if (chain->index == chain_index) {
255 tcf_chain_hold(chain);
256 return chain;
257 }
258 }
259
260 return create ? tcf_chain_create(block, chain_index) : NULL;
261 }
262 EXPORT_SYMBOL(tcf_chain_get);
263
264 void tcf_chain_put(struct tcf_chain *chain)
265 {
266 if (--chain->refcnt == 0)
267 tcf_chain_destroy(chain);
268 }
269 EXPORT_SYMBOL(tcf_chain_put);
270
271 static bool tcf_block_offload_in_use(struct tcf_block *block)
272 {
273 return block->offloadcnt;
274 }
275
276 static int tcf_block_offload_cmd(struct tcf_block *block,
277 struct net_device *dev,
278 struct tcf_block_ext_info *ei,
279 enum tc_block_command command)
280 {
281 struct tc_block_offload bo = {};
282
283 bo.command = command;
284 bo.binder_type = ei->binder_type;
285 bo.block = block;
286 return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
287 }
288
289 static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
290 struct tcf_block_ext_info *ei)
291 {
292 struct net_device *dev = q->dev_queue->dev;
293 int err;
294
295 if (!dev->netdev_ops->ndo_setup_tc)
296 goto no_offload_dev_inc;
297
298 /* If tc offload feature is disabled and the block we try to bind
299 * to already has some offloaded filters, forbid to bind.
300 */
301 if (!tc_can_offload(dev) && tcf_block_offload_in_use(block))
302 return -EOPNOTSUPP;
303
304 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND);
305 if (err == -EOPNOTSUPP)
306 goto no_offload_dev_inc;
307 return err;
308
309 no_offload_dev_inc:
310 if (tcf_block_offload_in_use(block))
311 return -EOPNOTSUPP;
312 block->nooffloaddevcnt++;
313 return 0;
314 }
315
316 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
317 struct tcf_block_ext_info *ei)
318 {
319 struct net_device *dev = q->dev_queue->dev;
320 int err;
321
322 if (!dev->netdev_ops->ndo_setup_tc)
323 goto no_offload_dev_dec;
324 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND);
325 if (err == -EOPNOTSUPP)
326 goto no_offload_dev_dec;
327 return;
328
329 no_offload_dev_dec:
330 WARN_ON(block->nooffloaddevcnt-- == 0);
331 }
332
333 static int
334 tcf_chain_head_change_cb_add(struct tcf_chain *chain,
335 struct tcf_block_ext_info *ei,
336 struct netlink_ext_ack *extack)
337 {
338 struct tcf_filter_chain_list_item *item;
339
340 item = kmalloc(sizeof(*item), GFP_KERNEL);
341 if (!item) {
342 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
343 return -ENOMEM;
344 }
345 item->chain_head_change = ei->chain_head_change;
346 item->chain_head_change_priv = ei->chain_head_change_priv;
347 if (chain->filter_chain)
348 tcf_chain_head_change_item(item, chain->filter_chain);
349 list_add(&item->list, &chain->filter_chain_list);
350 return 0;
351 }
352
353 static void
354 tcf_chain_head_change_cb_del(struct tcf_chain *chain,
355 struct tcf_block_ext_info *ei)
356 {
357 struct tcf_filter_chain_list_item *item;
358
359 list_for_each_entry(item, &chain->filter_chain_list, list) {
360 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
361 (item->chain_head_change == ei->chain_head_change &&
362 item->chain_head_change_priv == ei->chain_head_change_priv)) {
363 tcf_chain_head_change_item(item, NULL);
364 list_del(&item->list);
365 kfree(item);
366 return;
367 }
368 }
369 WARN_ON(1);
370 }
371
372 struct tcf_net {
373 struct idr idr;
374 };
375
376 static unsigned int tcf_net_id;
377
378 static int tcf_block_insert(struct tcf_block *block, struct net *net,
379 struct netlink_ext_ack *extack)
380 {
381 struct tcf_net *tn = net_generic(net, tcf_net_id);
382
383 return idr_alloc_u32(&tn->idr, block, &block->index, block->index,
384 GFP_KERNEL);
385 }
386
387 static void tcf_block_remove(struct tcf_block *block, struct net *net)
388 {
389 struct tcf_net *tn = net_generic(net, tcf_net_id);
390
391 idr_remove(&tn->idr, block->index);
392 }
393
394 static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
395 u32 block_index,
396 struct netlink_ext_ack *extack)
397 {
398 struct tcf_block *block;
399 struct tcf_chain *chain;
400 int err;
401
402 block = kzalloc(sizeof(*block), GFP_KERNEL);
403 if (!block) {
404 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
405 return ERR_PTR(-ENOMEM);
406 }
407 INIT_LIST_HEAD(&block->chain_list);
408 INIT_LIST_HEAD(&block->cb_list);
409 INIT_LIST_HEAD(&block->owner_list);
410
411 /* Create chain 0 by default, it has to be always present. */
412 chain = tcf_chain_create(block, 0);
413 if (!chain) {
414 NL_SET_ERR_MSG(extack, "Failed to create new tcf chain");
415 err = -ENOMEM;
416 goto err_chain_create;
417 }
418 block->refcnt = 1;
419 block->net = net;
420 block->index = block_index;
421
422 /* Don't store q pointer for blocks which are shared */
423 if (!tcf_block_shared(block))
424 block->q = q;
425 return block;
426
427 err_chain_create:
428 kfree(block);
429 return ERR_PTR(err);
430 }
431
432 static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
433 {
434 struct tcf_net *tn = net_generic(net, tcf_net_id);
435
436 return idr_find(&tn->idr, block_index);
437 }
438
439 static struct tcf_chain *tcf_block_chain_zero(struct tcf_block *block)
440 {
441 return list_first_entry(&block->chain_list, struct tcf_chain, list);
442 }
443
444 struct tcf_block_owner_item {
445 struct list_head list;
446 struct Qdisc *q;
447 enum tcf_block_binder_type binder_type;
448 };
449
450 static void
451 tcf_block_owner_netif_keep_dst(struct tcf_block *block,
452 struct Qdisc *q,
453 enum tcf_block_binder_type binder_type)
454 {
455 if (block->keep_dst &&
456 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
457 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
458 netif_keep_dst(qdisc_dev(q));
459 }
460
461 void tcf_block_netif_keep_dst(struct tcf_block *block)
462 {
463 struct tcf_block_owner_item *item;
464
465 block->keep_dst = true;
466 list_for_each_entry(item, &block->owner_list, list)
467 tcf_block_owner_netif_keep_dst(block, item->q,
468 item->binder_type);
469 }
470 EXPORT_SYMBOL(tcf_block_netif_keep_dst);
471
472 static int tcf_block_owner_add(struct tcf_block *block,
473 struct Qdisc *q,
474 enum tcf_block_binder_type binder_type)
475 {
476 struct tcf_block_owner_item *item;
477
478 item = kmalloc(sizeof(*item), GFP_KERNEL);
479 if (!item)
480 return -ENOMEM;
481 item->q = q;
482 item->binder_type = binder_type;
483 list_add(&item->list, &block->owner_list);
484 return 0;
485 }
486
487 static void tcf_block_owner_del(struct tcf_block *block,
488 struct Qdisc *q,
489 enum tcf_block_binder_type binder_type)
490 {
491 struct tcf_block_owner_item *item;
492
493 list_for_each_entry(item, &block->owner_list, list) {
494 if (item->q == q && item->binder_type == binder_type) {
495 list_del(&item->list);
496 kfree(item);
497 return;
498 }
499 }
500 WARN_ON(1);
501 }
502
503 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
504 struct tcf_block_ext_info *ei,
505 struct netlink_ext_ack *extack)
506 {
507 struct net *net = qdisc_net(q);
508 struct tcf_block *block = NULL;
509 bool created = false;
510 int err;
511
512 if (ei->block_index) {
513 /* block_index not 0 means the shared block is requested */
514 block = tcf_block_lookup(net, ei->block_index);
515 if (block)
516 block->refcnt++;
517 }
518
519 if (!block) {
520 block = tcf_block_create(net, q, ei->block_index, extack);
521 if (IS_ERR(block))
522 return PTR_ERR(block);
523 created = true;
524 if (tcf_block_shared(block)) {
525 err = tcf_block_insert(block, net, extack);
526 if (err)
527 goto err_block_insert;
528 }
529 }
530
531 err = tcf_block_owner_add(block, q, ei->binder_type);
532 if (err)
533 goto err_block_owner_add;
534
535 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
536
537 err = tcf_chain_head_change_cb_add(tcf_block_chain_zero(block),
538 ei, extack);
539 if (err)
540 goto err_chain_head_change_cb_add;
541
542 err = tcf_block_offload_bind(block, q, ei);
543 if (err)
544 goto err_block_offload_bind;
545
546 *p_block = block;
547 return 0;
548
549 err_block_offload_bind:
550 tcf_chain_head_change_cb_del(tcf_block_chain_zero(block), ei);
551 err_chain_head_change_cb_add:
552 tcf_block_owner_del(block, q, ei->binder_type);
553 err_block_owner_add:
554 if (created) {
555 if (tcf_block_shared(block))
556 tcf_block_remove(block, net);
557 err_block_insert:
558 kfree(tcf_block_chain_zero(block));
559 kfree(block);
560 } else {
561 block->refcnt--;
562 }
563 return err;
564 }
565 EXPORT_SYMBOL(tcf_block_get_ext);
566
567 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
568 {
569 struct tcf_proto __rcu **p_filter_chain = priv;
570
571 rcu_assign_pointer(*p_filter_chain, tp_head);
572 }
573
574 int tcf_block_get(struct tcf_block **p_block,
575 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
576 struct netlink_ext_ack *extack)
577 {
578 struct tcf_block_ext_info ei = {
579 .chain_head_change = tcf_chain_head_change_dflt,
580 .chain_head_change_priv = p_filter_chain,
581 };
582
583 WARN_ON(!p_filter_chain);
584 return tcf_block_get_ext(p_block, q, &ei, extack);
585 }
586 EXPORT_SYMBOL(tcf_block_get);
587
588 /* XXX: Standalone actions are not allowed to jump to any chain, and bound
589 * actions should be all removed after flushing.
590 */
591 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
592 struct tcf_block_ext_info *ei)
593 {
594 struct tcf_chain *chain, *tmp;
595
596 if (!block)
597 return;
598 tcf_chain_head_change_cb_del(tcf_block_chain_zero(block), ei);
599 tcf_block_owner_del(block, q, ei->binder_type);
600
601 if (--block->refcnt == 0) {
602 if (tcf_block_shared(block))
603 tcf_block_remove(block, block->net);
604
605 /* Hold a refcnt for all chains, so that they don't disappear
606 * while we are iterating.
607 */
608 list_for_each_entry(chain, &block->chain_list, list)
609 tcf_chain_hold(chain);
610
611 list_for_each_entry(chain, &block->chain_list, list)
612 tcf_chain_flush(chain);
613 }
614
615 tcf_block_offload_unbind(block, q, ei);
616
617 if (block->refcnt == 0) {
618 /* At this point, all the chains should have refcnt >= 1. */
619 list_for_each_entry_safe(chain, tmp, &block->chain_list, list)
620 tcf_chain_put(chain);
621
622 /* Finally, put chain 0 and allow block to be freed. */
623 tcf_chain_put(tcf_block_chain_zero(block));
624 }
625 }
626 EXPORT_SYMBOL(tcf_block_put_ext);
627
628 void tcf_block_put(struct tcf_block *block)
629 {
630 struct tcf_block_ext_info ei = {0, };
631
632 if (!block)
633 return;
634 tcf_block_put_ext(block, block->q, &ei);
635 }
636
637 EXPORT_SYMBOL(tcf_block_put);
638
639 struct tcf_block_cb {
640 struct list_head list;
641 tc_setup_cb_t *cb;
642 void *cb_ident;
643 void *cb_priv;
644 unsigned int refcnt;
645 };
646
647 void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
648 {
649 return block_cb->cb_priv;
650 }
651 EXPORT_SYMBOL(tcf_block_cb_priv);
652
653 struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
654 tc_setup_cb_t *cb, void *cb_ident)
655 { struct tcf_block_cb *block_cb;
656
657 list_for_each_entry(block_cb, &block->cb_list, list)
658 if (block_cb->cb == cb && block_cb->cb_ident == cb_ident)
659 return block_cb;
660 return NULL;
661 }
662 EXPORT_SYMBOL(tcf_block_cb_lookup);
663
664 void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
665 {
666 block_cb->refcnt++;
667 }
668 EXPORT_SYMBOL(tcf_block_cb_incref);
669
670 unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
671 {
672 return --block_cb->refcnt;
673 }
674 EXPORT_SYMBOL(tcf_block_cb_decref);
675
676 struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
677 tc_setup_cb_t *cb, void *cb_ident,
678 void *cb_priv)
679 {
680 struct tcf_block_cb *block_cb;
681
682 /* At this point, playback of previous block cb calls is not supported,
683 * so forbid to register to block which already has some offloaded
684 * filters present.
685 */
686 if (tcf_block_offload_in_use(block))
687 return ERR_PTR(-EOPNOTSUPP);
688
689 block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
690 if (!block_cb)
691 return ERR_PTR(-ENOMEM);
692 block_cb->cb = cb;
693 block_cb->cb_ident = cb_ident;
694 block_cb->cb_priv = cb_priv;
695 list_add(&block_cb->list, &block->cb_list);
696 return block_cb;
697 }
698 EXPORT_SYMBOL(__tcf_block_cb_register);
699
700 int tcf_block_cb_register(struct tcf_block *block,
701 tc_setup_cb_t *cb, void *cb_ident,
702 void *cb_priv)
703 {
704 struct tcf_block_cb *block_cb;
705
706 block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv);
707 return IS_ERR(block_cb) ? PTR_ERR(block_cb) : 0;
708 }
709 EXPORT_SYMBOL(tcf_block_cb_register);
710
711 void __tcf_block_cb_unregister(struct tcf_block_cb *block_cb)
712 {
713 list_del(&block_cb->list);
714 kfree(block_cb);
715 }
716 EXPORT_SYMBOL(__tcf_block_cb_unregister);
717
718 void tcf_block_cb_unregister(struct tcf_block *block,
719 tc_setup_cb_t *cb, void *cb_ident)
720 {
721 struct tcf_block_cb *block_cb;
722
723 block_cb = tcf_block_cb_lookup(block, cb, cb_ident);
724 if (!block_cb)
725 return;
726 __tcf_block_cb_unregister(block_cb);
727 }
728 EXPORT_SYMBOL(tcf_block_cb_unregister);
729
730 static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type,
731 void *type_data, bool err_stop)
732 {
733 struct tcf_block_cb *block_cb;
734 int ok_count = 0;
735 int err;
736
737 /* Make sure all netdevs sharing this block are offload-capable. */
738 if (block->nooffloaddevcnt && err_stop)
739 return -EOPNOTSUPP;
740
741 list_for_each_entry(block_cb, &block->cb_list, list) {
742 err = block_cb->cb(type, type_data, block_cb->cb_priv);
743 if (err) {
744 if (err_stop)
745 return err;
746 } else {
747 ok_count++;
748 }
749 }
750 return ok_count;
751 }
752
753 /* Main classifier routine: scans classifier chain attached
754 * to this qdisc, (optionally) tests for protocol and asks
755 * specific classifiers.
756 */
757 int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
758 struct tcf_result *res, bool compat_mode)
759 {
760 __be16 protocol = tc_skb_protocol(skb);
761 #ifdef CONFIG_NET_CLS_ACT
762 const int max_reclassify_loop = 4;
763 const struct tcf_proto *orig_tp = tp;
764 const struct tcf_proto *first_tp;
765 int limit = 0;
766
767 reclassify:
768 #endif
769 for (; tp; tp = rcu_dereference_bh(tp->next)) {
770 int err;
771
772 if (tp->protocol != protocol &&
773 tp->protocol != htons(ETH_P_ALL))
774 continue;
775
776 err = tp->classify(skb, tp, res);
777 #ifdef CONFIG_NET_CLS_ACT
778 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
779 first_tp = orig_tp;
780 goto reset;
781 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
782 first_tp = res->goto_tp;
783 goto reset;
784 }
785 #endif
786 if (err >= 0)
787 return err;
788 }
789
790 return TC_ACT_UNSPEC; /* signal: continue lookup */
791 #ifdef CONFIG_NET_CLS_ACT
792 reset:
793 if (unlikely(limit++ >= max_reclassify_loop)) {
794 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
795 tp->chain->block->index,
796 tp->prio & 0xffff,
797 ntohs(tp->protocol));
798 return TC_ACT_SHOT;
799 }
800
801 tp = first_tp;
802 protocol = tc_skb_protocol(skb);
803 goto reclassify;
804 #endif
805 }
806 EXPORT_SYMBOL(tcf_classify);
807
808 struct tcf_chain_info {
809 struct tcf_proto __rcu **pprev;
810 struct tcf_proto __rcu *next;
811 };
812
813 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info)
814 {
815 return rtnl_dereference(*chain_info->pprev);
816 }
817
818 static void tcf_chain_tp_insert(struct tcf_chain *chain,
819 struct tcf_chain_info *chain_info,
820 struct tcf_proto *tp)
821 {
822 if (*chain_info->pprev == chain->filter_chain)
823 tcf_chain_head_change(chain, tp);
824 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info));
825 rcu_assign_pointer(*chain_info->pprev, tp);
826 tcf_chain_hold(chain);
827 }
828
829 static void tcf_chain_tp_remove(struct tcf_chain *chain,
830 struct tcf_chain_info *chain_info,
831 struct tcf_proto *tp)
832 {
833 struct tcf_proto *next = rtnl_dereference(chain_info->next);
834
835 if (tp == chain->filter_chain)
836 tcf_chain_head_change(chain, next);
837 RCU_INIT_POINTER(*chain_info->pprev, next);
838 tcf_chain_put(chain);
839 }
840
841 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
842 struct tcf_chain_info *chain_info,
843 u32 protocol, u32 prio,
844 bool prio_allocate)
845 {
846 struct tcf_proto **pprev;
847 struct tcf_proto *tp;
848
849 /* Check the chain for existence of proto-tcf with this priority */
850 for (pprev = &chain->filter_chain;
851 (tp = rtnl_dereference(*pprev)); pprev = &tp->next) {
852 if (tp->prio >= prio) {
853 if (tp->prio == prio) {
854 if (prio_allocate ||
855 (tp->protocol != protocol && protocol))
856 return ERR_PTR(-EINVAL);
857 } else {
858 tp = NULL;
859 }
860 break;
861 }
862 }
863 chain_info->pprev = pprev;
864 chain_info->next = tp ? tp->next : NULL;
865 return tp;
866 }
867
868 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
869 struct tcf_proto *tp, struct tcf_block *block,
870 struct Qdisc *q, u32 parent, void *fh,
871 u32 portid, u32 seq, u16 flags, int event)
872 {
873 struct tcmsg *tcm;
874 struct nlmsghdr *nlh;
875 unsigned char *b = skb_tail_pointer(skb);
876
877 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
878 if (!nlh)
879 goto out_nlmsg_trim;
880 tcm = nlmsg_data(nlh);
881 tcm->tcm_family = AF_UNSPEC;
882 tcm->tcm__pad1 = 0;
883 tcm->tcm__pad2 = 0;
884 if (q) {
885 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
886 tcm->tcm_parent = parent;
887 } else {
888 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
889 tcm->tcm_block_index = block->index;
890 }
891 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
892 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
893 goto nla_put_failure;
894 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
895 goto nla_put_failure;
896 if (!fh) {
897 tcm->tcm_handle = 0;
898 } else {
899 if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0)
900 goto nla_put_failure;
901 }
902 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
903 return skb->len;
904
905 out_nlmsg_trim:
906 nla_put_failure:
907 nlmsg_trim(skb, b);
908 return -1;
909 }
910
911 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
912 struct nlmsghdr *n, struct tcf_proto *tp,
913 struct tcf_block *block, struct Qdisc *q,
914 u32 parent, void *fh, int event, bool unicast)
915 {
916 struct sk_buff *skb;
917 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
918
919 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
920 if (!skb)
921 return -ENOBUFS;
922
923 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
924 n->nlmsg_seq, n->nlmsg_flags, event) <= 0) {
925 kfree_skb(skb);
926 return -EINVAL;
927 }
928
929 if (unicast)
930 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
931
932 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
933 n->nlmsg_flags & NLM_F_ECHO);
934 }
935
936 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
937 struct nlmsghdr *n, struct tcf_proto *tp,
938 struct tcf_block *block, struct Qdisc *q,
939 u32 parent, void *fh, bool unicast, bool *last,
940 struct netlink_ext_ack *extack)
941 {
942 struct sk_buff *skb;
943 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
944 int err;
945
946 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
947 if (!skb)
948 return -ENOBUFS;
949
950 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
951 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER) <= 0) {
952 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
953 kfree_skb(skb);
954 return -EINVAL;
955 }
956
957 err = tp->ops->delete(tp, fh, last, extack);
958 if (err) {
959 kfree_skb(skb);
960 return err;
961 }
962
963 if (unicast)
964 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
965
966 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
967 n->nlmsg_flags & NLM_F_ECHO);
968 if (err < 0)
969 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
970 return err;
971 }
972
973 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
974 struct tcf_block *block, struct Qdisc *q,
975 u32 parent, struct nlmsghdr *n,
976 struct tcf_chain *chain, int event)
977 {
978 struct tcf_proto *tp;
979
980 for (tp = rtnl_dereference(chain->filter_chain);
981 tp; tp = rtnl_dereference(tp->next))
982 tfilter_notify(net, oskb, n, tp, block,
983 q, parent, 0, event, false);
984 }
985
986 /* Add/change/delete/get a filter node */
987
988 static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
989 struct netlink_ext_ack *extack)
990 {
991 struct net *net = sock_net(skb->sk);
992 struct nlattr *tca[TCA_MAX + 1];
993 struct tcmsg *t;
994 u32 protocol;
995 u32 prio;
996 bool prio_allocate;
997 u32 parent;
998 u32 chain_index;
999 struct Qdisc *q = NULL;
1000 struct tcf_chain_info chain_info;
1001 struct tcf_chain *chain = NULL;
1002 struct tcf_block *block;
1003 struct tcf_proto *tp;
1004 unsigned long cl;
1005 void *fh;
1006 int err;
1007 int tp_created;
1008
1009 if ((n->nlmsg_type != RTM_GETTFILTER) &&
1010 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1011 return -EPERM;
1012
1013 replay:
1014 tp_created = 0;
1015
1016 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
1017 if (err < 0)
1018 return err;
1019
1020 t = nlmsg_data(n);
1021 protocol = TC_H_MIN(t->tcm_info);
1022 prio = TC_H_MAJ(t->tcm_info);
1023 prio_allocate = false;
1024 parent = t->tcm_parent;
1025 cl = 0;
1026
1027 if (prio == 0) {
1028 switch (n->nlmsg_type) {
1029 case RTM_DELTFILTER:
1030 if (protocol || t->tcm_handle || tca[TCA_KIND]) {
1031 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
1032 return -ENOENT;
1033 }
1034 break;
1035 case RTM_NEWTFILTER:
1036 /* If no priority is provided by the user,
1037 * we allocate one.
1038 */
1039 if (n->nlmsg_flags & NLM_F_CREATE) {
1040 prio = TC_H_MAKE(0x80000000U, 0U);
1041 prio_allocate = true;
1042 break;
1043 }
1044 /* fall-through */
1045 default:
1046 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
1047 return -ENOENT;
1048 }
1049 }
1050
1051 /* Find head of filter chain. */
1052
1053 if (t->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1054 block = tcf_block_lookup(net, t->tcm_block_index);
1055 if (!block) {
1056 NL_SET_ERR_MSG(extack, "Block of given index was not found");
1057 err = -EINVAL;
1058 goto errout;
1059 }
1060 } else {
1061 const struct Qdisc_class_ops *cops;
1062 struct net_device *dev;
1063
1064 /* Find link */
1065 dev = __dev_get_by_index(net, t->tcm_ifindex);
1066 if (!dev)
1067 return -ENODEV;
1068
1069 /* Find qdisc */
1070 if (!parent) {
1071 q = dev->qdisc;
1072 parent = q->handle;
1073 } else {
1074 q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent));
1075 if (!q) {
1076 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1077 return -EINVAL;
1078 }
1079 }
1080
1081 /* Is it classful? */
1082 cops = q->ops->cl_ops;
1083 if (!cops) {
1084 NL_SET_ERR_MSG(extack, "Qdisc not classful");
1085 return -EINVAL;
1086 }
1087
1088 if (!cops->tcf_block) {
1089 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
1090 return -EOPNOTSUPP;
1091 }
1092
1093 /* Do we search for filter, attached to class? */
1094 if (TC_H_MIN(parent)) {
1095 cl = cops->find(q, parent);
1096 if (cl == 0) {
1097 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
1098 return -ENOENT;
1099 }
1100 }
1101
1102 /* And the last stroke */
1103 block = cops->tcf_block(q, cl, extack);
1104 if (!block) {
1105 err = -EINVAL;
1106 goto errout;
1107 }
1108 if (tcf_block_shared(block)) {
1109 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
1110 err = -EOPNOTSUPP;
1111 goto errout;
1112 }
1113 }
1114
1115 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
1116 if (chain_index > TC_ACT_EXT_VAL_MASK) {
1117 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
1118 err = -EINVAL;
1119 goto errout;
1120 }
1121 chain = tcf_chain_get(block, chain_index,
1122 n->nlmsg_type == RTM_NEWTFILTER);
1123 if (!chain) {
1124 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
1125 err = n->nlmsg_type == RTM_NEWTFILTER ? -ENOMEM : -EINVAL;
1126 goto errout;
1127 }
1128
1129 if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) {
1130 tfilter_notify_chain(net, skb, block, q, parent, n,
1131 chain, RTM_DELTFILTER);
1132 tcf_chain_flush(chain);
1133 err = 0;
1134 goto errout;
1135 }
1136
1137 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
1138 prio, prio_allocate);
1139 if (IS_ERR(tp)) {
1140 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
1141 err = PTR_ERR(tp);
1142 goto errout;
1143 }
1144
1145 if (tp == NULL) {
1146 /* Proto-tcf does not exist, create new one */
1147
1148 if (tca[TCA_KIND] == NULL || !protocol) {
1149 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
1150 err = -EINVAL;
1151 goto errout;
1152 }
1153
1154 if (n->nlmsg_type != RTM_NEWTFILTER ||
1155 !(n->nlmsg_flags & NLM_F_CREATE)) {
1156 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
1157 err = -ENOENT;
1158 goto errout;
1159 }
1160
1161 if (prio_allocate)
1162 prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info));
1163
1164 tp = tcf_proto_create(nla_data(tca[TCA_KIND]),
1165 protocol, prio, chain, extack);
1166 if (IS_ERR(tp)) {
1167 err = PTR_ERR(tp);
1168 goto errout;
1169 }
1170 tp_created = 1;
1171 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
1172 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
1173 err = -EINVAL;
1174 goto errout;
1175 }
1176
1177 fh = tp->ops->get(tp, t->tcm_handle);
1178
1179 if (!fh) {
1180 if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
1181 tcf_chain_tp_remove(chain, &chain_info, tp);
1182 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
1183 RTM_DELTFILTER, false);
1184 tcf_proto_destroy(tp, extack);
1185 err = 0;
1186 goto errout;
1187 }
1188
1189 if (n->nlmsg_type != RTM_NEWTFILTER ||
1190 !(n->nlmsg_flags & NLM_F_CREATE)) {
1191 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
1192 err = -ENOENT;
1193 goto errout;
1194 }
1195 } else {
1196 bool last;
1197
1198 switch (n->nlmsg_type) {
1199 case RTM_NEWTFILTER:
1200 if (n->nlmsg_flags & NLM_F_EXCL) {
1201 if (tp_created)
1202 tcf_proto_destroy(tp, NULL);
1203 NL_SET_ERR_MSG(extack, "Filter already exists");
1204 err = -EEXIST;
1205 goto errout;
1206 }
1207 break;
1208 case RTM_DELTFILTER:
1209 err = tfilter_del_notify(net, skb, n, tp, block,
1210 q, parent, fh, false, &last,
1211 extack);
1212 if (err)
1213 goto errout;
1214 if (last) {
1215 tcf_chain_tp_remove(chain, &chain_info, tp);
1216 tcf_proto_destroy(tp, extack);
1217 }
1218 goto errout;
1219 case RTM_GETTFILTER:
1220 err = tfilter_notify(net, skb, n, tp, block, q, parent,
1221 fh, RTM_NEWTFILTER, true);
1222 if (err < 0)
1223 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
1224 goto errout;
1225 default:
1226 NL_SET_ERR_MSG(extack, "Invalid netlink message type");
1227 err = -EINVAL;
1228 goto errout;
1229 }
1230 }
1231
1232 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
1233 n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
1234 extack);
1235 if (err == 0) {
1236 if (tp_created)
1237 tcf_chain_tp_insert(chain, &chain_info, tp);
1238 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
1239 RTM_NEWTFILTER, false);
1240 } else {
1241 if (tp_created)
1242 tcf_proto_destroy(tp, NULL);
1243 }
1244
1245 errout:
1246 if (chain)
1247 tcf_chain_put(chain);
1248 if (err == -EAGAIN)
1249 /* Replay the request. */
1250 goto replay;
1251 return err;
1252 }
1253
1254 struct tcf_dump_args {
1255 struct tcf_walker w;
1256 struct sk_buff *skb;
1257 struct netlink_callback *cb;
1258 struct tcf_block *block;
1259 struct Qdisc *q;
1260 u32 parent;
1261 };
1262
1263 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
1264 {
1265 struct tcf_dump_args *a = (void *)arg;
1266 struct net *net = sock_net(a->skb->sk);
1267
1268 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
1269 n, NETLINK_CB(a->cb->skb).portid,
1270 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
1271 RTM_NEWTFILTER);
1272 }
1273
1274 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
1275 struct sk_buff *skb, struct netlink_callback *cb,
1276 long index_start, long *p_index)
1277 {
1278 struct net *net = sock_net(skb->sk);
1279 struct tcf_block *block = chain->block;
1280 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1281 struct tcf_dump_args arg;
1282 struct tcf_proto *tp;
1283
1284 for (tp = rtnl_dereference(chain->filter_chain);
1285 tp; tp = rtnl_dereference(tp->next), (*p_index)++) {
1286 if (*p_index < index_start)
1287 continue;
1288 if (TC_H_MAJ(tcm->tcm_info) &&
1289 TC_H_MAJ(tcm->tcm_info) != tp->prio)
1290 continue;
1291 if (TC_H_MIN(tcm->tcm_info) &&
1292 TC_H_MIN(tcm->tcm_info) != tp->protocol)
1293 continue;
1294 if (*p_index > index_start)
1295 memset(&cb->args[1], 0,
1296 sizeof(cb->args) - sizeof(cb->args[0]));
1297 if (cb->args[1] == 0) {
1298 if (tcf_fill_node(net, skb, tp, block, q, parent, 0,
1299 NETLINK_CB(cb->skb).portid,
1300 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1301 RTM_NEWTFILTER) <= 0)
1302 return false;
1303
1304 cb->args[1] = 1;
1305 }
1306 if (!tp->ops->walk)
1307 continue;
1308 arg.w.fn = tcf_node_dump;
1309 arg.skb = skb;
1310 arg.cb = cb;
1311 arg.block = block;
1312 arg.q = q;
1313 arg.parent = parent;
1314 arg.w.stop = 0;
1315 arg.w.skip = cb->args[1] - 1;
1316 arg.w.count = 0;
1317 tp->ops->walk(tp, &arg.w);
1318 cb->args[1] = arg.w.count + 1;
1319 if (arg.w.stop)
1320 return false;
1321 }
1322 return true;
1323 }
1324
1325 /* called with RTNL */
1326 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
1327 {
1328 struct net *net = sock_net(skb->sk);
1329 struct nlattr *tca[TCA_MAX + 1];
1330 struct Qdisc *q = NULL;
1331 struct tcf_block *block;
1332 struct tcf_chain *chain;
1333 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1334 long index_start;
1335 long index;
1336 u32 parent;
1337 int err;
1338
1339 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1340 return skb->len;
1341
1342 err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
1343 if (err)
1344 return err;
1345
1346 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1347 block = tcf_block_lookup(net, tcm->tcm_block_index);
1348 if (!block)
1349 goto out;
1350 /* If we work with block index, q is NULL and parent value
1351 * will never be used in the following code. The check
1352 * in tcf_fill_node prevents it. However, compiler does not
1353 * see that far, so set parent to zero to silence the warning
1354 * about parent being uninitialized.
1355 */
1356 parent = 0;
1357 } else {
1358 const struct Qdisc_class_ops *cops;
1359 struct net_device *dev;
1360 unsigned long cl = 0;
1361
1362 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1363 if (!dev)
1364 return skb->len;
1365
1366 parent = tcm->tcm_parent;
1367 if (!parent) {
1368 q = dev->qdisc;
1369 parent = q->handle;
1370 } else {
1371 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
1372 }
1373 if (!q)
1374 goto out;
1375 cops = q->ops->cl_ops;
1376 if (!cops)
1377 goto out;
1378 if (!cops->tcf_block)
1379 goto out;
1380 if (TC_H_MIN(tcm->tcm_parent)) {
1381 cl = cops->find(q, tcm->tcm_parent);
1382 if (cl == 0)
1383 goto out;
1384 }
1385 block = cops->tcf_block(q, cl, NULL);
1386 if (!block)
1387 goto out;
1388 if (tcf_block_shared(block))
1389 q = NULL;
1390 }
1391
1392 index_start = cb->args[0];
1393 index = 0;
1394
1395 list_for_each_entry(chain, &block->chain_list, list) {
1396 if (tca[TCA_CHAIN] &&
1397 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
1398 continue;
1399 if (!tcf_chain_dump(chain, q, parent, skb, cb,
1400 index_start, &index)) {
1401 err = -EMSGSIZE;
1402 break;
1403 }
1404 }
1405
1406 cb->args[0] = index;
1407
1408 out:
1409 /* If we did no progress, the error (EMSGSIZE) is real */
1410 if (skb->len == 0 && err)
1411 return err;
1412 return skb->len;
1413 }
1414
1415 void tcf_exts_destroy(struct tcf_exts *exts)
1416 {
1417 #ifdef CONFIG_NET_CLS_ACT
1418 LIST_HEAD(actions);
1419
1420 ASSERT_RTNL();
1421 tcf_exts_to_list(exts, &actions);
1422 tcf_action_destroy(&actions, TCA_ACT_UNBIND);
1423 kfree(exts->actions);
1424 exts->nr_actions = 0;
1425 #endif
1426 }
1427 EXPORT_SYMBOL(tcf_exts_destroy);
1428
1429 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
1430 struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
1431 struct netlink_ext_ack *extack)
1432 {
1433 #ifdef CONFIG_NET_CLS_ACT
1434 {
1435 struct tc_action *act;
1436
1437 if (exts->police && tb[exts->police]) {
1438 act = tcf_action_init_1(net, tp, tb[exts->police],
1439 rate_tlv, "police", ovr,
1440 TCA_ACT_BIND);
1441 if (IS_ERR(act))
1442 return PTR_ERR(act);
1443
1444 act->type = exts->type = TCA_OLD_COMPAT;
1445 exts->actions[0] = act;
1446 exts->nr_actions = 1;
1447 } else if (exts->action && tb[exts->action]) {
1448 LIST_HEAD(actions);
1449 int err, i = 0;
1450
1451 err = tcf_action_init(net, tp, tb[exts->action],
1452 rate_tlv, NULL, ovr, TCA_ACT_BIND,
1453 &actions);
1454 if (err)
1455 return err;
1456 list_for_each_entry(act, &actions, list)
1457 exts->actions[i++] = act;
1458 exts->nr_actions = i;
1459 }
1460 exts->net = net;
1461 }
1462 #else
1463 if ((exts->action && tb[exts->action]) ||
1464 (exts->police && tb[exts->police])) {
1465 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
1466 return -EOPNOTSUPP;
1467 }
1468 #endif
1469
1470 return 0;
1471 }
1472 EXPORT_SYMBOL(tcf_exts_validate);
1473
1474 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
1475 {
1476 #ifdef CONFIG_NET_CLS_ACT
1477 struct tcf_exts old = *dst;
1478
1479 *dst = *src;
1480 tcf_exts_destroy(&old);
1481 #endif
1482 }
1483 EXPORT_SYMBOL(tcf_exts_change);
1484
1485 #ifdef CONFIG_NET_CLS_ACT
1486 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
1487 {
1488 if (exts->nr_actions == 0)
1489 return NULL;
1490 else
1491 return exts->actions[0];
1492 }
1493 #endif
1494
1495 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
1496 {
1497 #ifdef CONFIG_NET_CLS_ACT
1498 struct nlattr *nest;
1499
1500 if (exts->action && tcf_exts_has_actions(exts)) {
1501 /*
1502 * again for backward compatible mode - we want
1503 * to work with both old and new modes of entering
1504 * tc data even if iproute2 was newer - jhs
1505 */
1506 if (exts->type != TCA_OLD_COMPAT) {
1507 LIST_HEAD(actions);
1508
1509 nest = nla_nest_start(skb, exts->action);
1510 if (nest == NULL)
1511 goto nla_put_failure;
1512
1513 tcf_exts_to_list(exts, &actions);
1514 if (tcf_action_dump(skb, &actions, 0, 0) < 0)
1515 goto nla_put_failure;
1516 nla_nest_end(skb, nest);
1517 } else if (exts->police) {
1518 struct tc_action *act = tcf_exts_first_act(exts);
1519 nest = nla_nest_start(skb, exts->police);
1520 if (nest == NULL || !act)
1521 goto nla_put_failure;
1522 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
1523 goto nla_put_failure;
1524 nla_nest_end(skb, nest);
1525 }
1526 }
1527 return 0;
1528
1529 nla_put_failure:
1530 nla_nest_cancel(skb, nest);
1531 return -1;
1532 #else
1533 return 0;
1534 #endif
1535 }
1536 EXPORT_SYMBOL(tcf_exts_dump);
1537
1538
1539 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
1540 {
1541 #ifdef CONFIG_NET_CLS_ACT
1542 struct tc_action *a = tcf_exts_first_act(exts);
1543 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
1544 return -1;
1545 #endif
1546 return 0;
1547 }
1548 EXPORT_SYMBOL(tcf_exts_dump_stats);
1549
1550 static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts,
1551 enum tc_setup_type type,
1552 void *type_data, bool err_stop)
1553 {
1554 int ok_count = 0;
1555 #ifdef CONFIG_NET_CLS_ACT
1556 const struct tc_action *a;
1557 struct net_device *dev;
1558 int i, ret;
1559
1560 if (!tcf_exts_has_actions(exts))
1561 return 0;
1562
1563 for (i = 0; i < exts->nr_actions; i++) {
1564 a = exts->actions[i];
1565 if (!a->ops->get_dev)
1566 continue;
1567 dev = a->ops->get_dev(a);
1568 if (!dev)
1569 continue;
1570 ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop);
1571 if (ret < 0)
1572 return ret;
1573 ok_count += ret;
1574 }
1575 #endif
1576 return ok_count;
1577 }
1578
1579 int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
1580 enum tc_setup_type type, void *type_data, bool err_stop)
1581 {
1582 int ok_count;
1583 int ret;
1584
1585 ret = tcf_block_cb_call(block, type, type_data, err_stop);
1586 if (ret < 0)
1587 return ret;
1588 ok_count = ret;
1589
1590 if (!exts)
1591 return ok_count;
1592 ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop);
1593 if (ret < 0)
1594 return ret;
1595 ok_count += ret;
1596
1597 return ok_count;
1598 }
1599 EXPORT_SYMBOL(tc_setup_cb_call);
1600
1601 static __net_init int tcf_net_init(struct net *net)
1602 {
1603 struct tcf_net *tn = net_generic(net, tcf_net_id);
1604
1605 idr_init(&tn->idr);
1606 return 0;
1607 }
1608
1609 static void __net_exit tcf_net_exit(struct net *net)
1610 {
1611 struct tcf_net *tn = net_generic(net, tcf_net_id);
1612
1613 idr_destroy(&tn->idr);
1614 }
1615
1616 static struct pernet_operations tcf_net_ops = {
1617 .init = tcf_net_init,
1618 .exit = tcf_net_exit,
1619 .id = &tcf_net_id,
1620 .size = sizeof(struct tcf_net),
1621 };
1622
1623 static int __init tc_filter_init(void)
1624 {
1625 int err;
1626
1627 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
1628 if (!tc_filter_wq)
1629 return -ENOMEM;
1630
1631 err = register_pernet_subsys(&tcf_net_ops);
1632 if (err)
1633 goto err_register_pernet_subsys;
1634
1635 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, 0);
1636 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, 0);
1637 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
1638 tc_dump_tfilter, 0);
1639
1640 return 0;
1641
1642 err_register_pernet_subsys:
1643 destroy_workqueue(tc_filter_wq);
1644 return err;
1645 }
1646
1647 subsys_initcall(tc_filter_init);
CRIS linux kernel tree