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perf scripts python: call-graph-from-sql.py: Provide better default column sizes
[linux/fpc-iii.git] / net / sched / cls_api.c
blob0a75cb2e5e7ba2d83b063956c0ce91af25679cb1
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 static const struct tcf_proto_ops *
61 tcf_proto_lookup_ops(const char *kind, struct netlink_ext_ack *extack)
62 {
63 const struct tcf_proto_ops *ops;
64
65 ops = __tcf_proto_lookup_ops(kind);
66 if (ops)
67 return ops;
68 #ifdef CONFIG_MODULES
69 rtnl_unlock();
70 request_module("cls_%s", kind);
71 rtnl_lock();
72 ops = __tcf_proto_lookup_ops(kind);
73 /* We dropped the RTNL semaphore in order to perform
74 * the module load. So, even if we succeeded in loading
75 * the module we have to replay the request. We indicate
76 * this using -EAGAIN.
77 */
78 if (ops) {
79 module_put(ops->owner);
80 return ERR_PTR(-EAGAIN);
81 }
82 #endif
83 NL_SET_ERR_MSG(extack, "TC classifier not found");
84 return ERR_PTR(-ENOENT);
85 }
86
87 /* Register(unregister) new classifier type */
88
89 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
90 {
91 struct tcf_proto_ops *t;
92 int rc = -EEXIST;
93
94 write_lock(&cls_mod_lock);
95 list_for_each_entry(t, &tcf_proto_base, head)
96 if (!strcmp(ops->kind, t->kind))
97 goto out;
98
99 list_add_tail(&ops->head, &tcf_proto_base);
100 rc = 0;
101 out:
102 write_unlock(&cls_mod_lock);
103 return rc;
104 }
105 EXPORT_SYMBOL(register_tcf_proto_ops);
106
107 static struct workqueue_struct *tc_filter_wq;
108
109 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
110 {
111 struct tcf_proto_ops *t;
112 int rc = -ENOENT;
113
114 /* Wait for outstanding call_rcu()s, if any, from a
115 * tcf_proto_ops's destroy() handler.
116 */
117 rcu_barrier();
118 flush_workqueue(tc_filter_wq);
119
120 write_lock(&cls_mod_lock);
121 list_for_each_entry(t, &tcf_proto_base, head) {
122 if (t == ops) {
123 list_del(&t->head);
124 rc = 0;
125 break;
126 }
127 }
128 write_unlock(&cls_mod_lock);
129 return rc;
130 }
131 EXPORT_SYMBOL(unregister_tcf_proto_ops);
132
133 bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
134 {
135 INIT_RCU_WORK(rwork, func);
136 return queue_rcu_work(tc_filter_wq, rwork);
137 }
138 EXPORT_SYMBOL(tcf_queue_work);
139
140 /* Select new prio value from the range, managed by kernel. */
141
142 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
143 {
144 u32 first = TC_H_MAKE(0xC0000000U, 0U);
145
146 if (tp)
147 first = tp->prio - 1;
148
149 return TC_H_MAJ(first);
150 }
151
152 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
153 u32 prio, struct tcf_chain *chain,
154 struct netlink_ext_ack *extack)
155 {
156 struct tcf_proto *tp;
157 int err;
158
159 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
160 if (!tp)
161 return ERR_PTR(-ENOBUFS);
162
163 tp->ops = tcf_proto_lookup_ops(kind, extack);
164 if (IS_ERR(tp->ops)) {
165 err = PTR_ERR(tp->ops);
166 goto errout;
167 }
168 tp->classify = tp->ops->classify;
169 tp->protocol = protocol;
170 tp->prio = prio;
171 tp->chain = chain;
172
173 err = tp->ops->init(tp);
174 if (err) {
175 module_put(tp->ops->owner);
176 goto errout;
177 }
178 return tp;
179
180 errout:
181 kfree(tp);
182 return ERR_PTR(err);
183 }
184
185 static void tcf_proto_destroy(struct tcf_proto *tp,
186 struct netlink_ext_ack *extack)
187 {
188 tp->ops->destroy(tp, extack);
189 module_put(tp->ops->owner);
190 kfree_rcu(tp, rcu);
191 }
192
193 struct tcf_filter_chain_list_item {
194 struct list_head list;
195 tcf_chain_head_change_t *chain_head_change;
196 void *chain_head_change_priv;
197 };
198
199 static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
200 u32 chain_index)
201 {
202 struct tcf_chain *chain;
203
204 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
205 if (!chain)
206 return NULL;
207 list_add_tail(&chain->list, &block->chain_list);
208 chain->block = block;
209 chain->index = chain_index;
210 chain->refcnt = 1;
211 if (!chain->index)
212 block->chain0.chain = chain;
213 return chain;
214 }
215
216 static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
217 struct tcf_proto *tp_head)
218 {
219 if (item->chain_head_change)
220 item->chain_head_change(tp_head, item->chain_head_change_priv);
221 }
222
223 static void tcf_chain0_head_change(struct tcf_chain *chain,
224 struct tcf_proto *tp_head)
225 {
226 struct tcf_filter_chain_list_item *item;
227 struct tcf_block *block = chain->block;
228
229 if (chain->index)
230 return;
231 list_for_each_entry(item, &block->chain0.filter_chain_list, list)
232 tcf_chain_head_change_item(item, tp_head);
233 }
234
235 static void tcf_chain_destroy(struct tcf_chain *chain)
236 {
237 struct tcf_block *block = chain->block;
238
239 list_del(&chain->list);
240 if (!chain->index)
241 block->chain0.chain = NULL;
242 kfree(chain);
243 if (list_empty(&block->chain_list) && block->refcnt == 0)
244 kfree(block);
245 }
246
247 static void tcf_chain_hold(struct tcf_chain *chain)
248 {
249 ++chain->refcnt;
250 }
251
252 static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
253 {
254 /* In case all the references are action references, this
255 * chain should not be shown to the user.
256 */
257 return chain->refcnt == chain->action_refcnt;
258 }
259
260 static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
261 u32 chain_index)
262 {
263 struct tcf_chain *chain;
264
265 list_for_each_entry(chain, &block->chain_list, list) {
266 if (chain->index == chain_index)
267 return chain;
268 }
269 return NULL;
270 }
271
272 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
273 u32 seq, u16 flags, int event, bool unicast);
274
275 static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
276 u32 chain_index, bool create,
277 bool by_act)
278 {
279 struct tcf_chain *chain = tcf_chain_lookup(block, chain_index);
280
281 if (chain) {
282 tcf_chain_hold(chain);
283 } else {
284 if (!create)
285 return NULL;
286 chain = tcf_chain_create(block, chain_index);
287 if (!chain)
288 return NULL;
289 }
290
291 if (by_act)
292 ++chain->action_refcnt;
293
294 /* Send notification only in case we got the first
295 * non-action reference. Until then, the chain acts only as
296 * a placeholder for actions pointing to it and user ought
297 * not know about them.
298 */
299 if (chain->refcnt - chain->action_refcnt == 1 && !by_act)
300 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
301 RTM_NEWCHAIN, false);
302
303 return chain;
304 }
305
306 static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
307 bool create)
308 {
309 return __tcf_chain_get(block, chain_index, create, false);
310 }
311
312 struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
313 {
314 return __tcf_chain_get(block, chain_index, true, true);
315 }
316 EXPORT_SYMBOL(tcf_chain_get_by_act);
317
318 static void tc_chain_tmplt_del(struct tcf_chain *chain);
319
320 static void __tcf_chain_put(struct tcf_chain *chain, bool by_act)
321 {
322 if (by_act)
323 chain->action_refcnt--;
324 chain->refcnt--;
325
326 /* The last dropped non-action reference will trigger notification. */
327 if (chain->refcnt - chain->action_refcnt == 0 && !by_act)
328 tc_chain_notify(chain, NULL, 0, 0, RTM_DELCHAIN, false);
329
330 if (chain->refcnt == 0) {
331 tc_chain_tmplt_del(chain);
332 tcf_chain_destroy(chain);
333 }
334 }
335
336 static void tcf_chain_put(struct tcf_chain *chain)
337 {
338 __tcf_chain_put(chain, false);
339 }
340
341 void tcf_chain_put_by_act(struct tcf_chain *chain)
342 {
343 __tcf_chain_put(chain, true);
344 }
345 EXPORT_SYMBOL(tcf_chain_put_by_act);
346
347 static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
348 {
349 if (chain->explicitly_created)
350 tcf_chain_put(chain);
351 }
352
353 static void tcf_chain_flush(struct tcf_chain *chain)
354 {
355 struct tcf_proto *tp = rtnl_dereference(chain->filter_chain);
356
357 tcf_chain0_head_change(chain, NULL);
358 while (tp) {
359 RCU_INIT_POINTER(chain->filter_chain, tp->next);
360 tcf_proto_destroy(tp, NULL);
361 tp = rtnl_dereference(chain->filter_chain);
362 tcf_chain_put(chain);
363 }
364 }
365
366 static bool tcf_block_offload_in_use(struct tcf_block *block)
367 {
368 return block->offloadcnt;
369 }
370
371 static int tcf_block_offload_cmd(struct tcf_block *block,
372 struct net_device *dev,
373 struct tcf_block_ext_info *ei,
374 enum tc_block_command command,
375 struct netlink_ext_ack *extack)
376 {
377 struct tc_block_offload bo = {};
378
379 bo.command = command;
380 bo.binder_type = ei->binder_type;
381 bo.block = block;
382 bo.extack = extack;
383 return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
384 }
385
386 static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
387 struct tcf_block_ext_info *ei,
388 struct netlink_ext_ack *extack)
389 {
390 struct net_device *dev = q->dev_queue->dev;
391 int err;
392
393 if (!dev->netdev_ops->ndo_setup_tc)
394 goto no_offload_dev_inc;
395
396 /* If tc offload feature is disabled and the block we try to bind
397 * to already has some offloaded filters, forbid to bind.
398 */
399 if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) {
400 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
401 return -EOPNOTSUPP;
402 }
403
404 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack);
405 if (err == -EOPNOTSUPP)
406 goto no_offload_dev_inc;
407 return err;
408
409 no_offload_dev_inc:
410 if (tcf_block_offload_in_use(block))
411 return -EOPNOTSUPP;
412 block->nooffloaddevcnt++;
413 return 0;
414 }
415
416 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
417 struct tcf_block_ext_info *ei)
418 {
419 struct net_device *dev = q->dev_queue->dev;
420 int err;
421
422 if (!dev->netdev_ops->ndo_setup_tc)
423 goto no_offload_dev_dec;
424 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL);
425 if (err == -EOPNOTSUPP)
426 goto no_offload_dev_dec;
427 return;
428
429 no_offload_dev_dec:
430 WARN_ON(block->nooffloaddevcnt-- == 0);
431 }
432
433 static int
434 tcf_chain0_head_change_cb_add(struct tcf_block *block,
435 struct tcf_block_ext_info *ei,
436 struct netlink_ext_ack *extack)
437 {
438 struct tcf_chain *chain0 = block->chain0.chain;
439 struct tcf_filter_chain_list_item *item;
440
441 item = kmalloc(sizeof(*item), GFP_KERNEL);
442 if (!item) {
443 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
444 return -ENOMEM;
445 }
446 item->chain_head_change = ei->chain_head_change;
447 item->chain_head_change_priv = ei->chain_head_change_priv;
448 if (chain0 && chain0->filter_chain)
449 tcf_chain_head_change_item(item, chain0->filter_chain);
450 list_add(&item->list, &block->chain0.filter_chain_list);
451 return 0;
452 }
453
454 static void
455 tcf_chain0_head_change_cb_del(struct tcf_block *block,
456 struct tcf_block_ext_info *ei)
457 {
458 struct tcf_chain *chain0 = block->chain0.chain;
459 struct tcf_filter_chain_list_item *item;
460
461 list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
462 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
463 (item->chain_head_change == ei->chain_head_change &&
464 item->chain_head_change_priv == ei->chain_head_change_priv)) {
465 if (chain0)
466 tcf_chain_head_change_item(item, NULL);
467 list_del(&item->list);
468 kfree(item);
469 return;
470 }
471 }
472 WARN_ON(1);
473 }
474
475 struct tcf_net {
476 struct idr idr;
477 };
478
479 static unsigned int tcf_net_id;
480
481 static int tcf_block_insert(struct tcf_block *block, struct net *net,
482 struct netlink_ext_ack *extack)
483 {
484 struct tcf_net *tn = net_generic(net, tcf_net_id);
485
486 return idr_alloc_u32(&tn->idr, block, &block->index, block->index,
487 GFP_KERNEL);
488 }
489
490 static void tcf_block_remove(struct tcf_block *block, struct net *net)
491 {
492 struct tcf_net *tn = net_generic(net, tcf_net_id);
493
494 idr_remove(&tn->idr, block->index);
495 }
496
497 static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
498 u32 block_index,
499 struct netlink_ext_ack *extack)
500 {
501 struct tcf_block *block;
502
503 block = kzalloc(sizeof(*block), GFP_KERNEL);
504 if (!block) {
505 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
506 return ERR_PTR(-ENOMEM);
507 }
508 INIT_LIST_HEAD(&block->chain_list);
509 INIT_LIST_HEAD(&block->cb_list);
510 INIT_LIST_HEAD(&block->owner_list);
511 INIT_LIST_HEAD(&block->chain0.filter_chain_list);
512
513 block->refcnt = 1;
514 block->net = net;
515 block->index = block_index;
516
517 /* Don't store q pointer for blocks which are shared */
518 if (!tcf_block_shared(block))
519 block->q = q;
520 return block;
521 }
522
523 static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
524 {
525 struct tcf_net *tn = net_generic(net, tcf_net_id);
526
527 return idr_find(&tn->idr, block_index);
528 }
529
530 /* Find tcf block.
531 * Set q, parent, cl when appropriate.
532 */
533
534 static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
535 u32 *parent, unsigned long *cl,
536 int ifindex, u32 block_index,
537 struct netlink_ext_ack *extack)
538 {
539 struct tcf_block *block;
540
541 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
542 block = tcf_block_lookup(net, block_index);
543 if (!block) {
544 NL_SET_ERR_MSG(extack, "Block of given index was not found");
545 return ERR_PTR(-EINVAL);
546 }
547 } else {
548 const struct Qdisc_class_ops *cops;
549 struct net_device *dev;
550
551 /* Find link */
552 dev = __dev_get_by_index(net, ifindex);
553 if (!dev)
554 return ERR_PTR(-ENODEV);
555
556 /* Find qdisc */
557 if (!*parent) {
558 *q = dev->qdisc;
559 *parent = (*q)->handle;
560 } else {
561 *q = qdisc_lookup(dev, TC_H_MAJ(*parent));
562 if (!*q) {
563 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
564 return ERR_PTR(-EINVAL);
565 }
566 }
567
568 /* Is it classful? */
569 cops = (*q)->ops->cl_ops;
570 if (!cops) {
571 NL_SET_ERR_MSG(extack, "Qdisc not classful");
572 return ERR_PTR(-EINVAL);
573 }
574
575 if (!cops->tcf_block) {
576 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
577 return ERR_PTR(-EOPNOTSUPP);
578 }
579
580 /* Do we search for filter, attached to class? */
581 if (TC_H_MIN(*parent)) {
582 *cl = cops->find(*q, *parent);
583 if (*cl == 0) {
584 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
585 return ERR_PTR(-ENOENT);
586 }
587 }
588
589 /* And the last stroke */
590 block = cops->tcf_block(*q, *cl, extack);
591 if (!block)
592 return ERR_PTR(-EINVAL);
593 if (tcf_block_shared(block)) {
594 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
595 return ERR_PTR(-EOPNOTSUPP);
596 }
597 }
598
599 return block;
600 }
601
602 struct tcf_block_owner_item {
603 struct list_head list;
604 struct Qdisc *q;
605 enum tcf_block_binder_type binder_type;
606 };
607
608 static void
609 tcf_block_owner_netif_keep_dst(struct tcf_block *block,
610 struct Qdisc *q,
611 enum tcf_block_binder_type binder_type)
612 {
613 if (block->keep_dst &&
614 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
615 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
616 netif_keep_dst(qdisc_dev(q));
617 }
618
619 void tcf_block_netif_keep_dst(struct tcf_block *block)
620 {
621 struct tcf_block_owner_item *item;
622
623 block->keep_dst = true;
624 list_for_each_entry(item, &block->owner_list, list)
625 tcf_block_owner_netif_keep_dst(block, item->q,
626 item->binder_type);
627 }
628 EXPORT_SYMBOL(tcf_block_netif_keep_dst);
629
630 static int tcf_block_owner_add(struct tcf_block *block,
631 struct Qdisc *q,
632 enum tcf_block_binder_type binder_type)
633 {
634 struct tcf_block_owner_item *item;
635
636 item = kmalloc(sizeof(*item), GFP_KERNEL);
637 if (!item)
638 return -ENOMEM;
639 item->q = q;
640 item->binder_type = binder_type;
641 list_add(&item->list, &block->owner_list);
642 return 0;
643 }
644
645 static void tcf_block_owner_del(struct tcf_block *block,
646 struct Qdisc *q,
647 enum tcf_block_binder_type binder_type)
648 {
649 struct tcf_block_owner_item *item;
650
651 list_for_each_entry(item, &block->owner_list, list) {
652 if (item->q == q && item->binder_type == binder_type) {
653 list_del(&item->list);
654 kfree(item);
655 return;
656 }
657 }
658 WARN_ON(1);
659 }
660
661 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
662 struct tcf_block_ext_info *ei,
663 struct netlink_ext_ack *extack)
664 {
665 struct net *net = qdisc_net(q);
666 struct tcf_block *block = NULL;
667 bool created = false;
668 int err;
669
670 if (ei->block_index) {
671 /* block_index not 0 means the shared block is requested */
672 block = tcf_block_lookup(net, ei->block_index);
673 if (block)
674 block->refcnt++;
675 }
676
677 if (!block) {
678 block = tcf_block_create(net, q, ei->block_index, extack);
679 if (IS_ERR(block))
680 return PTR_ERR(block);
681 created = true;
682 if (tcf_block_shared(block)) {
683 err = tcf_block_insert(block, net, extack);
684 if (err)
685 goto err_block_insert;
686 }
687 }
688
689 err = tcf_block_owner_add(block, q, ei->binder_type);
690 if (err)
691 goto err_block_owner_add;
692
693 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
694
695 err = tcf_chain0_head_change_cb_add(block, ei, extack);
696 if (err)
697 goto err_chain0_head_change_cb_add;
698
699 err = tcf_block_offload_bind(block, q, ei, extack);
700 if (err)
701 goto err_block_offload_bind;
702
703 *p_block = block;
704 return 0;
705
706 err_block_offload_bind:
707 tcf_chain0_head_change_cb_del(block, ei);
708 err_chain0_head_change_cb_add:
709 tcf_block_owner_del(block, q, ei->binder_type);
710 err_block_owner_add:
711 if (created) {
712 if (tcf_block_shared(block))
713 tcf_block_remove(block, net);
714 err_block_insert:
715 kfree(block);
716 } else {
717 block->refcnt--;
718 }
719 return err;
720 }
721 EXPORT_SYMBOL(tcf_block_get_ext);
722
723 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
724 {
725 struct tcf_proto __rcu **p_filter_chain = priv;
726
727 rcu_assign_pointer(*p_filter_chain, tp_head);
728 }
729
730 int tcf_block_get(struct tcf_block **p_block,
731 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
732 struct netlink_ext_ack *extack)
733 {
734 struct tcf_block_ext_info ei = {
735 .chain_head_change = tcf_chain_head_change_dflt,
736 .chain_head_change_priv = p_filter_chain,
737 };
738
739 WARN_ON(!p_filter_chain);
740 return tcf_block_get_ext(p_block, q, &ei, extack);
741 }
742 EXPORT_SYMBOL(tcf_block_get);
743
744 /* XXX: Standalone actions are not allowed to jump to any chain, and bound
745 * actions should be all removed after flushing.
746 */
747 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
748 struct tcf_block_ext_info *ei)
749 {
750 struct tcf_chain *chain, *tmp;
751
752 if (!block)
753 return;
754 tcf_chain0_head_change_cb_del(block, ei);
755 tcf_block_owner_del(block, q, ei->binder_type);
756
757 if (block->refcnt == 1) {
758 if (tcf_block_shared(block))
759 tcf_block_remove(block, block->net);
760
761 /* Hold a refcnt for all chains, so that they don't disappear
762 * while we are iterating.
763 */
764 list_for_each_entry(chain, &block->chain_list, list)
765 tcf_chain_hold(chain);
766
767 list_for_each_entry(chain, &block->chain_list, list)
768 tcf_chain_flush(chain);
769 }
770
771 tcf_block_offload_unbind(block, q, ei);
772
773 if (block->refcnt == 1) {
774 /* At this point, all the chains should have refcnt >= 1. */
775 list_for_each_entry_safe(chain, tmp, &block->chain_list, list) {
776 tcf_chain_put_explicitly_created(chain);
777 tcf_chain_put(chain);
778 }
779
780 block->refcnt--;
781 if (list_empty(&block->chain_list))
782 kfree(block);
783 } else {
784 block->refcnt--;
785 }
786 }
787 EXPORT_SYMBOL(tcf_block_put_ext);
788
789 void tcf_block_put(struct tcf_block *block)
790 {
791 struct tcf_block_ext_info ei = {0, };
792
793 if (!block)
794 return;
795 tcf_block_put_ext(block, block->q, &ei);
796 }
797
798 EXPORT_SYMBOL(tcf_block_put);
799
800 struct tcf_block_cb {
801 struct list_head list;
802 tc_setup_cb_t *cb;
803 void *cb_ident;
804 void *cb_priv;
805 unsigned int refcnt;
806 };
807
808 void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
809 {
810 return block_cb->cb_priv;
811 }
812 EXPORT_SYMBOL(tcf_block_cb_priv);
813
814 struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
815 tc_setup_cb_t *cb, void *cb_ident)
816 { struct tcf_block_cb *block_cb;
817
818 list_for_each_entry(block_cb, &block->cb_list, list)
819 if (block_cb->cb == cb && block_cb->cb_ident == cb_ident)
820 return block_cb;
821 return NULL;
822 }
823 EXPORT_SYMBOL(tcf_block_cb_lookup);
824
825 void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
826 {
827 block_cb->refcnt++;
828 }
829 EXPORT_SYMBOL(tcf_block_cb_incref);
830
831 unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
832 {
833 return --block_cb->refcnt;
834 }
835 EXPORT_SYMBOL(tcf_block_cb_decref);
836
837 static int
838 tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb,
839 void *cb_priv, bool add, bool offload_in_use,
840 struct netlink_ext_ack *extack)
841 {
842 struct tcf_chain *chain;
843 struct tcf_proto *tp;
844 int err;
845
846 list_for_each_entry(chain, &block->chain_list, list) {
847 for (tp = rtnl_dereference(chain->filter_chain); tp;
848 tp = rtnl_dereference(tp->next)) {
849 if (tp->ops->reoffload) {
850 err = tp->ops->reoffload(tp, add, cb, cb_priv,
851 extack);
852 if (err && add)
853 goto err_playback_remove;
854 } else if (add && offload_in_use) {
855 err = -EOPNOTSUPP;
856 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
857 goto err_playback_remove;
858 }
859 }
860 }
861
862 return 0;
863
864 err_playback_remove:
865 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
866 extack);
867 return err;
868 }
869
870 struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
871 tc_setup_cb_t *cb, void *cb_ident,
872 void *cb_priv,
873 struct netlink_ext_ack *extack)
874 {
875 struct tcf_block_cb *block_cb;
876 int err;
877
878 /* Replay any already present rules */
879 err = tcf_block_playback_offloads(block, cb, cb_priv, true,
880 tcf_block_offload_in_use(block),
881 extack);
882 if (err)
883 return ERR_PTR(err);
884
885 block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
886 if (!block_cb)
887 return ERR_PTR(-ENOMEM);
888 block_cb->cb = cb;
889 block_cb->cb_ident = cb_ident;
890 block_cb->cb_priv = cb_priv;
891 list_add(&block_cb->list, &block->cb_list);
892 return block_cb;
893 }
894 EXPORT_SYMBOL(__tcf_block_cb_register);
895
896 int tcf_block_cb_register(struct tcf_block *block,
897 tc_setup_cb_t *cb, void *cb_ident,
898 void *cb_priv, struct netlink_ext_ack *extack)
899 {
900 struct tcf_block_cb *block_cb;
901
902 block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv,
903 extack);
904 return PTR_ERR_OR_ZERO(block_cb);
905 }
906 EXPORT_SYMBOL(tcf_block_cb_register);
907
908 void __tcf_block_cb_unregister(struct tcf_block *block,
909 struct tcf_block_cb *block_cb)
910 {
911 tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv,
912 false, tcf_block_offload_in_use(block),
913 NULL);
914 list_del(&block_cb->list);
915 kfree(block_cb);
916 }
917 EXPORT_SYMBOL(__tcf_block_cb_unregister);
918
919 void tcf_block_cb_unregister(struct tcf_block *block,
920 tc_setup_cb_t *cb, void *cb_ident)
921 {
922 struct tcf_block_cb *block_cb;
923
924 block_cb = tcf_block_cb_lookup(block, cb, cb_ident);
925 if (!block_cb)
926 return;
927 __tcf_block_cb_unregister(block, block_cb);
928 }
929 EXPORT_SYMBOL(tcf_block_cb_unregister);
930
931 static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type,
932 void *type_data, bool err_stop)
933 {
934 struct tcf_block_cb *block_cb;
935 int ok_count = 0;
936 int err;
937
938 /* Make sure all netdevs sharing this block are offload-capable. */
939 if (block->nooffloaddevcnt && err_stop)
940 return -EOPNOTSUPP;
941
942 list_for_each_entry(block_cb, &block->cb_list, list) {
943 err = block_cb->cb(type, type_data, block_cb->cb_priv);
944 if (err) {
945 if (err_stop)
946 return err;
947 } else {
948 ok_count++;
949 }
950 }
951 return ok_count;
952 }
953
954 /* Main classifier routine: scans classifier chain attached
955 * to this qdisc, (optionally) tests for protocol and asks
956 * specific classifiers.
957 */
958 int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
959 struct tcf_result *res, bool compat_mode)
960 {
961 __be16 protocol = tc_skb_protocol(skb);
962 #ifdef CONFIG_NET_CLS_ACT
963 const int max_reclassify_loop = 4;
964 const struct tcf_proto *orig_tp = tp;
965 const struct tcf_proto *first_tp;
966 int limit = 0;
967
968 reclassify:
969 #endif
970 for (; tp; tp = rcu_dereference_bh(tp->next)) {
971 int err;
972
973 if (tp->protocol != protocol &&
974 tp->protocol != htons(ETH_P_ALL))
975 continue;
976
977 err = tp->classify(skb, tp, res);
978 #ifdef CONFIG_NET_CLS_ACT
979 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
980 first_tp = orig_tp;
981 goto reset;
982 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
983 first_tp = res->goto_tp;
984 goto reset;
985 }
986 #endif
987 if (err >= 0)
988 return err;
989 }
990
991 return TC_ACT_UNSPEC; /* signal: continue lookup */
992 #ifdef CONFIG_NET_CLS_ACT
993 reset:
994 if (unlikely(limit++ >= max_reclassify_loop)) {
995 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
996 tp->chain->block->index,
997 tp->prio & 0xffff,
998 ntohs(tp->protocol));
999 return TC_ACT_SHOT;
1000 }
1001
1002 tp = first_tp;
1003 protocol = tc_skb_protocol(skb);
1004 goto reclassify;
1005 #endif
1006 }
1007 EXPORT_SYMBOL(tcf_classify);
1008
1009 struct tcf_chain_info {
1010 struct tcf_proto __rcu **pprev;
1011 struct tcf_proto __rcu *next;
1012 };
1013
1014 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info)
1015 {
1016 return rtnl_dereference(*chain_info->pprev);
1017 }
1018
1019 static void tcf_chain_tp_insert(struct tcf_chain *chain,
1020 struct tcf_chain_info *chain_info,
1021 struct tcf_proto *tp)
1022 {
1023 if (*chain_info->pprev == chain->filter_chain)
1024 tcf_chain0_head_change(chain, tp);
1025 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info));
1026 rcu_assign_pointer(*chain_info->pprev, tp);
1027 tcf_chain_hold(chain);
1028 }
1029
1030 static void tcf_chain_tp_remove(struct tcf_chain *chain,
1031 struct tcf_chain_info *chain_info,
1032 struct tcf_proto *tp)
1033 {
1034 struct tcf_proto *next = rtnl_dereference(chain_info->next);
1035
1036 if (tp == chain->filter_chain)
1037 tcf_chain0_head_change(chain, next);
1038 RCU_INIT_POINTER(*chain_info->pprev, next);
1039 tcf_chain_put(chain);
1040 }
1041
1042 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1043 struct tcf_chain_info *chain_info,
1044 u32 protocol, u32 prio,
1045 bool prio_allocate)
1046 {
1047 struct tcf_proto **pprev;
1048 struct tcf_proto *tp;
1049
1050 /* Check the chain for existence of proto-tcf with this priority */
1051 for (pprev = &chain->filter_chain;
1052 (tp = rtnl_dereference(*pprev)); pprev = &tp->next) {
1053 if (tp->prio >= prio) {
1054 if (tp->prio == prio) {
1055 if (prio_allocate ||
1056 (tp->protocol != protocol && protocol))
1057 return ERR_PTR(-EINVAL);
1058 } else {
1059 tp = NULL;
1060 }
1061 break;
1062 }
1063 }
1064 chain_info->pprev = pprev;
1065 chain_info->next = tp ? tp->next : NULL;
1066 return tp;
1067 }
1068
1069 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
1070 struct tcf_proto *tp, struct tcf_block *block,
1071 struct Qdisc *q, u32 parent, void *fh,
1072 u32 portid, u32 seq, u16 flags, int event)
1073 {
1074 struct tcmsg *tcm;
1075 struct nlmsghdr *nlh;
1076 unsigned char *b = skb_tail_pointer(skb);
1077
1078 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1079 if (!nlh)
1080 goto out_nlmsg_trim;
1081 tcm = nlmsg_data(nlh);
1082 tcm->tcm_family = AF_UNSPEC;
1083 tcm->tcm__pad1 = 0;
1084 tcm->tcm__pad2 = 0;
1085 if (q) {
1086 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1087 tcm->tcm_parent = parent;
1088 } else {
1089 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1090 tcm->tcm_block_index = block->index;
1091 }
1092 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
1093 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
1094 goto nla_put_failure;
1095 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
1096 goto nla_put_failure;
1097 if (!fh) {
1098 tcm->tcm_handle = 0;
1099 } else {
1100 if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0)
1101 goto nla_put_failure;
1102 }
1103 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1104 return skb->len;
1105
1106 out_nlmsg_trim:
1107 nla_put_failure:
1108 nlmsg_trim(skb, b);
1109 return -1;
1110 }
1111
1112 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
1113 struct nlmsghdr *n, struct tcf_proto *tp,
1114 struct tcf_block *block, struct Qdisc *q,
1115 u32 parent, void *fh, int event, bool unicast)
1116 {
1117 struct sk_buff *skb;
1118 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1119
1120 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1121 if (!skb)
1122 return -ENOBUFS;
1123
1124 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1125 n->nlmsg_seq, n->nlmsg_flags, event) <= 0) {
1126 kfree_skb(skb);
1127 return -EINVAL;
1128 }
1129
1130 if (unicast)
1131 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1132
1133 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1134 n->nlmsg_flags & NLM_F_ECHO);
1135 }
1136
1137 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
1138 struct nlmsghdr *n, struct tcf_proto *tp,
1139 struct tcf_block *block, struct Qdisc *q,
1140 u32 parent, void *fh, bool unicast, bool *last,
1141 struct netlink_ext_ack *extack)
1142 {
1143 struct sk_buff *skb;
1144 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1145 int err;
1146
1147 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1148 if (!skb)
1149 return -ENOBUFS;
1150
1151 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1152 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER) <= 0) {
1153 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
1154 kfree_skb(skb);
1155 return -EINVAL;
1156 }
1157
1158 err = tp->ops->delete(tp, fh, last, extack);
1159 if (err) {
1160 kfree_skb(skb);
1161 return err;
1162 }
1163
1164 if (unicast)
1165 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1166
1167 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1168 n->nlmsg_flags & NLM_F_ECHO);
1169 if (err < 0)
1170 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
1171 return err;
1172 }
1173
1174 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
1175 struct tcf_block *block, struct Qdisc *q,
1176 u32 parent, struct nlmsghdr *n,
1177 struct tcf_chain *chain, int event)
1178 {
1179 struct tcf_proto *tp;
1180
1181 for (tp = rtnl_dereference(chain->filter_chain);
1182 tp; tp = rtnl_dereference(tp->next))
1183 tfilter_notify(net, oskb, n, tp, block,
1184 q, parent, NULL, event, false);
1185 }
1186
1187 static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1188 struct netlink_ext_ack *extack)
1189 {
1190 struct net *net = sock_net(skb->sk);
1191 struct nlattr *tca[TCA_MAX + 1];
1192 struct tcmsg *t;
1193 u32 protocol;
1194 u32 prio;
1195 bool prio_allocate;
1196 u32 parent;
1197 u32 chain_index;
1198 struct Qdisc *q = NULL;
1199 struct tcf_chain_info chain_info;
1200 struct tcf_chain *chain = NULL;
1201 struct tcf_block *block;
1202 struct tcf_proto *tp;
1203 unsigned long cl;
1204 void *fh;
1205 int err;
1206 int tp_created;
1207
1208 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1209 return -EPERM;
1210
1211 replay:
1212 tp_created = 0;
1213
1214 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
1215 if (err < 0)
1216 return err;
1217
1218 t = nlmsg_data(n);
1219 protocol = TC_H_MIN(t->tcm_info);
1220 prio = TC_H_MAJ(t->tcm_info);
1221 prio_allocate = false;
1222 parent = t->tcm_parent;
1223 cl = 0;
1224
1225 if (prio == 0) {
1226 /* If no priority is provided by the user,
1227 * we allocate one.
1228 */
1229 if (n->nlmsg_flags & NLM_F_CREATE) {
1230 prio = TC_H_MAKE(0x80000000U, 0U);
1231 prio_allocate = true;
1232 } else {
1233 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
1234 return -ENOENT;
1235 }
1236 }
1237
1238 /* Find head of filter chain. */
1239
1240 block = tcf_block_find(net, &q, &parent, &cl,
1241 t->tcm_ifindex, t->tcm_block_index, extack);
1242 if (IS_ERR(block)) {
1243 err = PTR_ERR(block);
1244 goto errout;
1245 }
1246
1247 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
1248 if (chain_index > TC_ACT_EXT_VAL_MASK) {
1249 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
1250 err = -EINVAL;
1251 goto errout;
1252 }
1253 chain = tcf_chain_get(block, chain_index, true);
1254 if (!chain) {
1255 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
1256 err = -ENOMEM;
1257 goto errout;
1258 }
1259
1260 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
1261 prio, prio_allocate);
1262 if (IS_ERR(tp)) {
1263 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
1264 err = PTR_ERR(tp);
1265 goto errout;
1266 }
1267
1268 if (tp == NULL) {
1269 /* Proto-tcf does not exist, create new one */
1270
1271 if (tca[TCA_KIND] == NULL || !protocol) {
1272 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
1273 err = -EINVAL;
1274 goto errout;
1275 }
1276
1277 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1278 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
1279 err = -ENOENT;
1280 goto errout;
1281 }
1282
1283 if (prio_allocate)
1284 prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info));
1285
1286 tp = tcf_proto_create(nla_data(tca[TCA_KIND]),
1287 protocol, prio, chain, extack);
1288 if (IS_ERR(tp)) {
1289 err = PTR_ERR(tp);
1290 goto errout;
1291 }
1292 tp_created = 1;
1293 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
1294 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
1295 err = -EINVAL;
1296 goto errout;
1297 }
1298
1299 fh = tp->ops->get(tp, t->tcm_handle);
1300
1301 if (!fh) {
1302 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1303 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
1304 err = -ENOENT;
1305 goto errout;
1306 }
1307 } else if (n->nlmsg_flags & NLM_F_EXCL) {
1308 NL_SET_ERR_MSG(extack, "Filter already exists");
1309 err = -EEXIST;
1310 goto errout;
1311 }
1312
1313 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
1314 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
1315 err = -EINVAL;
1316 goto errout;
1317 }
1318
1319 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
1320 n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
1321 extack);
1322 if (err == 0) {
1323 if (tp_created)
1324 tcf_chain_tp_insert(chain, &chain_info, tp);
1325 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
1326 RTM_NEWTFILTER, false);
1327 } else {
1328 if (tp_created)
1329 tcf_proto_destroy(tp, NULL);
1330 }
1331
1332 errout:
1333 if (chain)
1334 tcf_chain_put(chain);
1335 if (err == -EAGAIN)
1336 /* Replay the request. */
1337 goto replay;
1338 return err;
1339 }
1340
1341 static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1342 struct netlink_ext_ack *extack)
1343 {
1344 struct net *net = sock_net(skb->sk);
1345 struct nlattr *tca[TCA_MAX + 1];
1346 struct tcmsg *t;
1347 u32 protocol;
1348 u32 prio;
1349 u32 parent;
1350 u32 chain_index;
1351 struct Qdisc *q = NULL;
1352 struct tcf_chain_info chain_info;
1353 struct tcf_chain *chain = NULL;
1354 struct tcf_block *block;
1355 struct tcf_proto *tp = NULL;
1356 unsigned long cl = 0;
1357 void *fh = NULL;
1358 int err;
1359
1360 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1361 return -EPERM;
1362
1363 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
1364 if (err < 0)
1365 return err;
1366
1367 t = nlmsg_data(n);
1368 protocol = TC_H_MIN(t->tcm_info);
1369 prio = TC_H_MAJ(t->tcm_info);
1370 parent = t->tcm_parent;
1371
1372 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
1373 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
1374 return -ENOENT;
1375 }
1376
1377 /* Find head of filter chain. */
1378
1379 block = tcf_block_find(net, &q, &parent, &cl,
1380 t->tcm_ifindex, t->tcm_block_index, extack);
1381 if (IS_ERR(block)) {
1382 err = PTR_ERR(block);
1383 goto errout;
1384 }
1385
1386 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
1387 if (chain_index > TC_ACT_EXT_VAL_MASK) {
1388 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
1389 err = -EINVAL;
1390 goto errout;
1391 }
1392 chain = tcf_chain_get(block, chain_index, false);
1393 if (!chain) {
1394 /* User requested flush on non-existent chain. Nothing to do,
1395 * so just return success.
1396 */
1397 if (prio == 0) {
1398 err = 0;
1399 goto errout;
1400 }
1401 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
1402 err = -ENOENT;
1403 goto errout;
1404 }
1405
1406 if (prio == 0) {
1407 tfilter_notify_chain(net, skb, block, q, parent, n,
1408 chain, RTM_DELTFILTER);
1409 tcf_chain_flush(chain);
1410 err = 0;
1411 goto errout;
1412 }
1413
1414 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
1415 prio, false);
1416 if (!tp || IS_ERR(tp)) {
1417 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
1418 err = tp ? PTR_ERR(tp) : -ENOENT;
1419 goto errout;
1420 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
1421 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
1422 err = -EINVAL;
1423 goto errout;
1424 }
1425
1426 fh = tp->ops->get(tp, t->tcm_handle);
1427
1428 if (!fh) {
1429 if (t->tcm_handle == 0) {
1430 tcf_chain_tp_remove(chain, &chain_info, tp);
1431 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
1432 RTM_DELTFILTER, false);
1433 tcf_proto_destroy(tp, extack);
1434 err = 0;
1435 } else {
1436 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
1437 err = -ENOENT;
1438 }
1439 } else {
1440 bool last;
1441
1442 err = tfilter_del_notify(net, skb, n, tp, block,
1443 q, parent, fh, false, &last,
1444 extack);
1445 if (err)
1446 goto errout;
1447 if (last) {
1448 tcf_chain_tp_remove(chain, &chain_info, tp);
1449 tcf_proto_destroy(tp, extack);
1450 }
1451 }
1452
1453 errout:
1454 if (chain)
1455 tcf_chain_put(chain);
1456 return err;
1457 }
1458
1459 static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1460 struct netlink_ext_ack *extack)
1461 {
1462 struct net *net = sock_net(skb->sk);
1463 struct nlattr *tca[TCA_MAX + 1];
1464 struct tcmsg *t;
1465 u32 protocol;
1466 u32 prio;
1467 u32 parent;
1468 u32 chain_index;
1469 struct Qdisc *q = NULL;
1470 struct tcf_chain_info chain_info;
1471 struct tcf_chain *chain = NULL;
1472 struct tcf_block *block;
1473 struct tcf_proto *tp = NULL;
1474 unsigned long cl = 0;
1475 void *fh = NULL;
1476 int err;
1477
1478 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
1479 if (err < 0)
1480 return err;
1481
1482 t = nlmsg_data(n);
1483 protocol = TC_H_MIN(t->tcm_info);
1484 prio = TC_H_MAJ(t->tcm_info);
1485 parent = t->tcm_parent;
1486
1487 if (prio == 0) {
1488 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
1489 return -ENOENT;
1490 }
1491
1492 /* Find head of filter chain. */
1493
1494 block = tcf_block_find(net, &q, &parent, &cl,
1495 t->tcm_ifindex, t->tcm_block_index, extack);
1496 if (IS_ERR(block)) {
1497 err = PTR_ERR(block);
1498 goto errout;
1499 }
1500
1501 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
1502 if (chain_index > TC_ACT_EXT_VAL_MASK) {
1503 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
1504 err = -EINVAL;
1505 goto errout;
1506 }
1507 chain = tcf_chain_get(block, chain_index, false);
1508 if (!chain) {
1509 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
1510 err = -EINVAL;
1511 goto errout;
1512 }
1513
1514 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
1515 prio, false);
1516 if (!tp || IS_ERR(tp)) {
1517 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
1518 err = tp ? PTR_ERR(tp) : -ENOENT;
1519 goto errout;
1520 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
1521 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
1522 err = -EINVAL;
1523 goto errout;
1524 }
1525
1526 fh = tp->ops->get(tp, t->tcm_handle);
1527
1528 if (!fh) {
1529 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
1530 err = -ENOENT;
1531 } else {
1532 err = tfilter_notify(net, skb, n, tp, block, q, parent,
1533 fh, RTM_NEWTFILTER, true);
1534 if (err < 0)
1535 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
1536 }
1537
1538 errout:
1539 if (chain)
1540 tcf_chain_put(chain);
1541 return err;
1542 }
1543
1544 struct tcf_dump_args {
1545 struct tcf_walker w;
1546 struct sk_buff *skb;
1547 struct netlink_callback *cb;
1548 struct tcf_block *block;
1549 struct Qdisc *q;
1550 u32 parent;
1551 };
1552
1553 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
1554 {
1555 struct tcf_dump_args *a = (void *)arg;
1556 struct net *net = sock_net(a->skb->sk);
1557
1558 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
1559 n, NETLINK_CB(a->cb->skb).portid,
1560 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
1561 RTM_NEWTFILTER);
1562 }
1563
1564 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
1565 struct sk_buff *skb, struct netlink_callback *cb,
1566 long index_start, long *p_index)
1567 {
1568 struct net *net = sock_net(skb->sk);
1569 struct tcf_block *block = chain->block;
1570 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1571 struct tcf_dump_args arg;
1572 struct tcf_proto *tp;
1573
1574 for (tp = rtnl_dereference(chain->filter_chain);
1575 tp; tp = rtnl_dereference(tp->next), (*p_index)++) {
1576 if (*p_index < index_start)
1577 continue;
1578 if (TC_H_MAJ(tcm->tcm_info) &&
1579 TC_H_MAJ(tcm->tcm_info) != tp->prio)
1580 continue;
1581 if (TC_H_MIN(tcm->tcm_info) &&
1582 TC_H_MIN(tcm->tcm_info) != tp->protocol)
1583 continue;
1584 if (*p_index > index_start)
1585 memset(&cb->args[1], 0,
1586 sizeof(cb->args) - sizeof(cb->args[0]));
1587 if (cb->args[1] == 0) {
1588 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
1589 NETLINK_CB(cb->skb).portid,
1590 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1591 RTM_NEWTFILTER) <= 0)
1592 return false;
1593
1594 cb->args[1] = 1;
1595 }
1596 if (!tp->ops->walk)
1597 continue;
1598 arg.w.fn = tcf_node_dump;
1599 arg.skb = skb;
1600 arg.cb = cb;
1601 arg.block = block;
1602 arg.q = q;
1603 arg.parent = parent;
1604 arg.w.stop = 0;
1605 arg.w.skip = cb->args[1] - 1;
1606 arg.w.count = 0;
1607 arg.w.cookie = cb->args[2];
1608 tp->ops->walk(tp, &arg.w);
1609 cb->args[2] = arg.w.cookie;
1610 cb->args[1] = arg.w.count + 1;
1611 if (arg.w.stop)
1612 return false;
1613 }
1614 return true;
1615 }
1616
1617 /* called with RTNL */
1618 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
1619 {
1620 struct net *net = sock_net(skb->sk);
1621 struct nlattr *tca[TCA_MAX + 1];
1622 struct Qdisc *q = NULL;
1623 struct tcf_block *block;
1624 struct tcf_chain *chain;
1625 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1626 long index_start;
1627 long index;
1628 u32 parent;
1629 int err;
1630
1631 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1632 return skb->len;
1633
1634 err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
1635 if (err)
1636 return err;
1637
1638 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1639 block = tcf_block_lookup(net, tcm->tcm_block_index);
1640 if (!block)
1641 goto out;
1642 /* If we work with block index, q is NULL and parent value
1643 * will never be used in the following code. The check
1644 * in tcf_fill_node prevents it. However, compiler does not
1645 * see that far, so set parent to zero to silence the warning
1646 * about parent being uninitialized.
1647 */
1648 parent = 0;
1649 } else {
1650 const struct Qdisc_class_ops *cops;
1651 struct net_device *dev;
1652 unsigned long cl = 0;
1653
1654 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1655 if (!dev)
1656 return skb->len;
1657
1658 parent = tcm->tcm_parent;
1659 if (!parent) {
1660 q = dev->qdisc;
1661 parent = q->handle;
1662 } else {
1663 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
1664 }
1665 if (!q)
1666 goto out;
1667 cops = q->ops->cl_ops;
1668 if (!cops)
1669 goto out;
1670 if (!cops->tcf_block)
1671 goto out;
1672 if (TC_H_MIN(tcm->tcm_parent)) {
1673 cl = cops->find(q, tcm->tcm_parent);
1674 if (cl == 0)
1675 goto out;
1676 }
1677 block = cops->tcf_block(q, cl, NULL);
1678 if (!block)
1679 goto out;
1680 if (tcf_block_shared(block))
1681 q = NULL;
1682 }
1683
1684 index_start = cb->args[0];
1685 index = 0;
1686
1687 list_for_each_entry(chain, &block->chain_list, list) {
1688 if (tca[TCA_CHAIN] &&
1689 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
1690 continue;
1691 if (!tcf_chain_dump(chain, q, parent, skb, cb,
1692 index_start, &index)) {
1693 err = -EMSGSIZE;
1694 break;
1695 }
1696 }
1697
1698 cb->args[0] = index;
1699
1700 out:
1701 /* If we did no progress, the error (EMSGSIZE) is real */
1702 if (skb->len == 0 && err)
1703 return err;
1704 return skb->len;
1705 }
1706
1707 static int tc_chain_fill_node(struct tcf_chain *chain, struct net *net,
1708 struct sk_buff *skb, struct tcf_block *block,
1709 u32 portid, u32 seq, u16 flags, int event)
1710 {
1711 unsigned char *b = skb_tail_pointer(skb);
1712 const struct tcf_proto_ops *ops;
1713 struct nlmsghdr *nlh;
1714 struct tcmsg *tcm;
1715 void *priv;
1716
1717 ops = chain->tmplt_ops;
1718 priv = chain->tmplt_priv;
1719
1720 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1721 if (!nlh)
1722 goto out_nlmsg_trim;
1723 tcm = nlmsg_data(nlh);
1724 tcm->tcm_family = AF_UNSPEC;
1725 tcm->tcm__pad1 = 0;
1726 tcm->tcm__pad2 = 0;
1727 tcm->tcm_handle = 0;
1728 if (block->q) {
1729 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
1730 tcm->tcm_parent = block->q->handle;
1731 } else {
1732 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1733 tcm->tcm_block_index = block->index;
1734 }
1735
1736 if (nla_put_u32(skb, TCA_CHAIN, chain->index))
1737 goto nla_put_failure;
1738
1739 if (ops) {
1740 if (nla_put_string(skb, TCA_KIND, ops->kind))
1741 goto nla_put_failure;
1742 if (ops->tmplt_dump(skb, net, priv) < 0)
1743 goto nla_put_failure;
1744 }
1745
1746 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1747 return skb->len;
1748
1749 out_nlmsg_trim:
1750 nla_put_failure:
1751 nlmsg_trim(skb, b);
1752 return -EMSGSIZE;
1753 }
1754
1755 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
1756 u32 seq, u16 flags, int event, bool unicast)
1757 {
1758 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1759 struct tcf_block *block = chain->block;
1760 struct net *net = block->net;
1761 struct sk_buff *skb;
1762
1763 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1764 if (!skb)
1765 return -ENOBUFS;
1766
1767 if (tc_chain_fill_node(chain, net, skb, block, portid,
1768 seq, flags, event) <= 0) {
1769 kfree_skb(skb);
1770 return -EINVAL;
1771 }
1772
1773 if (unicast)
1774 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1775
1776 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
1777 }
1778
1779 static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
1780 struct nlattr **tca,
1781 struct netlink_ext_ack *extack)
1782 {
1783 const struct tcf_proto_ops *ops;
1784 void *tmplt_priv;
1785
1786 /* If kind is not set, user did not specify template. */
1787 if (!tca[TCA_KIND])
1788 return 0;
1789
1790 ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), extack);
1791 if (IS_ERR(ops))
1792 return PTR_ERR(ops);
1793 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
1794 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
1795 return -EOPNOTSUPP;
1796 }
1797
1798 tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
1799 if (IS_ERR(tmplt_priv)) {
1800 module_put(ops->owner);
1801 return PTR_ERR(tmplt_priv);
1802 }
1803 chain->tmplt_ops = ops;
1804 chain->tmplt_priv = tmplt_priv;
1805 return 0;
1806 }
1807
1808 static void tc_chain_tmplt_del(struct tcf_chain *chain)
1809 {
1810 const struct tcf_proto_ops *ops = chain->tmplt_ops;
1811
1812 /* If template ops are set, no work to do for us. */
1813 if (!ops)
1814 return;
1815
1816 ops->tmplt_destroy(chain->tmplt_priv);
1817 module_put(ops->owner);
1818 }
1819
1820 /* Add/delete/get a chain */
1821
1822 static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
1823 struct netlink_ext_ack *extack)
1824 {
1825 struct net *net = sock_net(skb->sk);
1826 struct nlattr *tca[TCA_MAX + 1];
1827 struct tcmsg *t;
1828 u32 parent;
1829 u32 chain_index;
1830 struct Qdisc *q = NULL;
1831 struct tcf_chain *chain = NULL;
1832 struct tcf_block *block;
1833 unsigned long cl;
1834 int err;
1835
1836 if (n->nlmsg_type != RTM_GETCHAIN &&
1837 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1838 return -EPERM;
1839
1840 replay:
1841 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL, extack);
1842 if (err < 0)
1843 return err;
1844
1845 t = nlmsg_data(n);
1846 parent = t->tcm_parent;
1847 cl = 0;
1848
1849 block = tcf_block_find(net, &q, &parent, &cl,
1850 t->tcm_ifindex, t->tcm_block_index, extack);
1851 if (IS_ERR(block))
1852 return PTR_ERR(block);
1853
1854 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
1855 if (chain_index > TC_ACT_EXT_VAL_MASK) {
1856 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
1857 return -EINVAL;
1858 }
1859 chain = tcf_chain_lookup(block, chain_index);
1860 if (n->nlmsg_type == RTM_NEWCHAIN) {
1861 if (chain) {
1862 if (tcf_chain_held_by_acts_only(chain)) {
1863 /* The chain exists only because there is
1864 * some action referencing it.
1865 */
1866 tcf_chain_hold(chain);
1867 } else {
1868 NL_SET_ERR_MSG(extack, "Filter chain already exists");
1869 return -EEXIST;
1870 }
1871 } else {
1872 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1873 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
1874 return -ENOENT;
1875 }
1876 chain = tcf_chain_create(block, chain_index);
1877 if (!chain) {
1878 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
1879 return -ENOMEM;
1880 }
1881 }
1882 } else {
1883 if (!chain || tcf_chain_held_by_acts_only(chain)) {
1884 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
1885 return -EINVAL;
1886 }
1887 tcf_chain_hold(chain);
1888 }
1889
1890 switch (n->nlmsg_type) {
1891 case RTM_NEWCHAIN:
1892 err = tc_chain_tmplt_add(chain, net, tca, extack);
1893 if (err)
1894 goto errout;
1895 /* In case the chain was successfully added, take a reference
1896 * to the chain. This ensures that an empty chain
1897 * does not disappear at the end of this function.
1898 */
1899 tcf_chain_hold(chain);
1900 chain->explicitly_created = true;
1901 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
1902 RTM_NEWCHAIN, false);
1903 break;
1904 case RTM_DELCHAIN:
1905 tfilter_notify_chain(net, skb, block, q, parent, n,
1906 chain, RTM_DELTFILTER);
1907 /* Flush the chain first as the user requested chain removal. */
1908 tcf_chain_flush(chain);
1909 /* In case the chain was successfully deleted, put a reference
1910 * to the chain previously taken during addition.
1911 */
1912 tcf_chain_put_explicitly_created(chain);
1913 chain->explicitly_created = false;
1914 break;
1915 case RTM_GETCHAIN:
1916 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
1917 n->nlmsg_seq, n->nlmsg_type, true);
1918 if (err < 0)
1919 NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
1920 break;
1921 default:
1922 err = -EOPNOTSUPP;
1923 NL_SET_ERR_MSG(extack, "Unsupported message type");
1924 goto errout;
1925 }
1926
1927 errout:
1928 tcf_chain_put(chain);
1929 if (err == -EAGAIN)
1930 /* Replay the request. */
1931 goto replay;
1932 return err;
1933 }
1934
1935 /* called with RTNL */
1936 static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
1937 {
1938 struct net *net = sock_net(skb->sk);
1939 struct nlattr *tca[TCA_MAX + 1];
1940 struct Qdisc *q = NULL;
1941 struct tcf_block *block;
1942 struct tcf_chain *chain;
1943 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1944 long index_start;
1945 long index;
1946 u32 parent;
1947 int err;
1948
1949 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1950 return skb->len;
1951
1952 err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
1953 if (err)
1954 return err;
1955
1956 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1957 block = tcf_block_lookup(net, tcm->tcm_block_index);
1958 if (!block)
1959 goto out;
1960 /* If we work with block index, q is NULL and parent value
1961 * will never be used in the following code. The check
1962 * in tcf_fill_node prevents it. However, compiler does not
1963 * see that far, so set parent to zero to silence the warning
1964 * about parent being uninitialized.
1965 */
1966 parent = 0;
1967 } else {
1968 const struct Qdisc_class_ops *cops;
1969 struct net_device *dev;
1970 unsigned long cl = 0;
1971
1972 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1973 if (!dev)
1974 return skb->len;
1975
1976 parent = tcm->tcm_parent;
1977 if (!parent) {
1978 q = dev->qdisc;
1979 parent = q->handle;
1980 } else {
1981 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
1982 }
1983 if (!q)
1984 goto out;
1985 cops = q->ops->cl_ops;
1986 if (!cops)
1987 goto out;
1988 if (!cops->tcf_block)
1989 goto out;
1990 if (TC_H_MIN(tcm->tcm_parent)) {
1991 cl = cops->find(q, tcm->tcm_parent);
1992 if (cl == 0)
1993 goto out;
1994 }
1995 block = cops->tcf_block(q, cl, NULL);
1996 if (!block)
1997 goto out;
1998 if (tcf_block_shared(block))
1999 q = NULL;
2000 }
2001
2002 index_start = cb->args[0];
2003 index = 0;
2004
2005 list_for_each_entry(chain, &block->chain_list, list) {
2006 if ((tca[TCA_CHAIN] &&
2007 nla_get_u32(tca[TCA_CHAIN]) != chain->index))
2008 continue;
2009 if (index < index_start) {
2010 index++;
2011 continue;
2012 }
2013 if (tcf_chain_held_by_acts_only(chain))
2014 continue;
2015 err = tc_chain_fill_node(chain, net, skb, block,
2016 NETLINK_CB(cb->skb).portid,
2017 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2018 RTM_NEWCHAIN);
2019 if (err <= 0)
2020 break;
2021 index++;
2022 }
2023
2024 cb->args[0] = index;
2025
2026 out:
2027 /* If we did no progress, the error (EMSGSIZE) is real */
2028 if (skb->len == 0 && err)
2029 return err;
2030 return skb->len;
2031 }
2032
2033 void tcf_exts_destroy(struct tcf_exts *exts)
2034 {
2035 #ifdef CONFIG_NET_CLS_ACT
2036 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
2037 kfree(exts->actions);
2038 exts->nr_actions = 0;
2039 #endif
2040 }
2041 EXPORT_SYMBOL(tcf_exts_destroy);
2042
2043 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
2044 struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
2045 struct netlink_ext_ack *extack)
2046 {
2047 #ifdef CONFIG_NET_CLS_ACT
2048 {
2049 struct tc_action *act;
2050 size_t attr_size = 0;
2051
2052 if (exts->police && tb[exts->police]) {
2053 act = tcf_action_init_1(net, tp, tb[exts->police],
2054 rate_tlv, "police", ovr,
2055 TCA_ACT_BIND, true, extack);
2056 if (IS_ERR(act))
2057 return PTR_ERR(act);
2058
2059 act->type = exts->type = TCA_OLD_COMPAT;
2060 exts->actions[0] = act;
2061 exts->nr_actions = 1;
2062 } else if (exts->action && tb[exts->action]) {
2063 int err;
2064
2065 err = tcf_action_init(net, tp, tb[exts->action],
2066 rate_tlv, NULL, ovr, TCA_ACT_BIND,
2067 exts->actions, &attr_size, true,
2068 extack);
2069 if (err < 0)
2070 return err;
2071 exts->nr_actions = err;
2072 }
2073 exts->net = net;
2074 }
2075 #else
2076 if ((exts->action && tb[exts->action]) ||
2077 (exts->police && tb[exts->police])) {
2078 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
2079 return -EOPNOTSUPP;
2080 }
2081 #endif
2082
2083 return 0;
2084 }
2085 EXPORT_SYMBOL(tcf_exts_validate);
2086
2087 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
2088 {
2089 #ifdef CONFIG_NET_CLS_ACT
2090 struct tcf_exts old = *dst;
2091
2092 *dst = *src;
2093 tcf_exts_destroy(&old);
2094 #endif
2095 }
2096 EXPORT_SYMBOL(tcf_exts_change);
2097
2098 #ifdef CONFIG_NET_CLS_ACT
2099 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
2100 {
2101 if (exts->nr_actions == 0)
2102 return NULL;
2103 else
2104 return exts->actions[0];
2105 }
2106 #endif
2107
2108 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
2109 {
2110 #ifdef CONFIG_NET_CLS_ACT
2111 struct nlattr *nest;
2112
2113 if (exts->action && tcf_exts_has_actions(exts)) {
2114 /*
2115 * again for backward compatible mode - we want
2116 * to work with both old and new modes of entering
2117 * tc data even if iproute2 was newer - jhs
2118 */
2119 if (exts->type != TCA_OLD_COMPAT) {
2120 nest = nla_nest_start(skb, exts->action);
2121 if (nest == NULL)
2122 goto nla_put_failure;
2123
2124 if (tcf_action_dump(skb, exts->actions, 0, 0) < 0)
2125 goto nla_put_failure;
2126 nla_nest_end(skb, nest);
2127 } else if (exts->police) {
2128 struct tc_action *act = tcf_exts_first_act(exts);
2129 nest = nla_nest_start(skb, exts->police);
2130 if (nest == NULL || !act)
2131 goto nla_put_failure;
2132 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
2133 goto nla_put_failure;
2134 nla_nest_end(skb, nest);
2135 }
2136 }
2137 return 0;
2138
2139 nla_put_failure:
2140 nla_nest_cancel(skb, nest);
2141 return -1;
2142 #else
2143 return 0;
2144 #endif
2145 }
2146 EXPORT_SYMBOL(tcf_exts_dump);
2147
2148
2149 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
2150 {
2151 #ifdef CONFIG_NET_CLS_ACT
2152 struct tc_action *a = tcf_exts_first_act(exts);
2153 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
2154 return -1;
2155 #endif
2156 return 0;
2157 }
2158 EXPORT_SYMBOL(tcf_exts_dump_stats);
2159
2160 static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts,
2161 enum tc_setup_type type,
2162 void *type_data, bool err_stop)
2163 {
2164 int ok_count = 0;
2165 #ifdef CONFIG_NET_CLS_ACT
2166 const struct tc_action *a;
2167 struct net_device *dev;
2168 int i, ret;
2169
2170 if (!tcf_exts_has_actions(exts))
2171 return 0;
2172
2173 for (i = 0; i < exts->nr_actions; i++) {
2174 a = exts->actions[i];
2175 if (!a->ops->get_dev)
2176 continue;
2177 dev = a->ops->get_dev(a);
2178 if (!dev)
2179 continue;
2180 ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop);
2181 a->ops->put_dev(dev);
2182 if (ret < 0)
2183 return ret;
2184 ok_count += ret;
2185 }
2186 #endif
2187 return ok_count;
2188 }
2189
2190 int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
2191 enum tc_setup_type type, void *type_data, bool err_stop)
2192 {
2193 int ok_count;
2194 int ret;
2195
2196 ret = tcf_block_cb_call(block, type, type_data, err_stop);
2197 if (ret < 0)
2198 return ret;
2199 ok_count = ret;
2200
2201 if (!exts || ok_count)
2202 return ok_count;
2203 ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop);
2204 if (ret < 0)
2205 return ret;
2206 ok_count += ret;
2207
2208 return ok_count;
2209 }
2210 EXPORT_SYMBOL(tc_setup_cb_call);
2211
2212 static __net_init int tcf_net_init(struct net *net)
2213 {
2214 struct tcf_net *tn = net_generic(net, tcf_net_id);
2215
2216 idr_init(&tn->idr);
2217 return 0;
2218 }
2219
2220 static void __net_exit tcf_net_exit(struct net *net)
2221 {
2222 struct tcf_net *tn = net_generic(net, tcf_net_id);
2223
2224 idr_destroy(&tn->idr);
2225 }
2226
2227 static struct pernet_operations tcf_net_ops = {
2228 .init = tcf_net_init,
2229 .exit = tcf_net_exit,
2230 .id = &tcf_net_id,
2231 .size = sizeof(struct tcf_net),
2232 };
2233
2234 static int __init tc_filter_init(void)
2235 {
2236 int err;
2237
2238 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
2239 if (!tc_filter_wq)
2240 return -ENOMEM;
2241
2242 err = register_pernet_subsys(&tcf_net_ops);
2243 if (err)
2244 goto err_register_pernet_subsys;
2245
2246 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, 0);
2247 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, 0);
2248 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
2249 tc_dump_tfilter, 0);
2250 rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
2251 rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
2252 rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
2253 tc_dump_chain, 0);
2254
2255 return 0;
2256
2257 err_register_pernet_subsys:
2258 destroy_workqueue(tc_filter_wq);
2259 return err;
2260 }
2261
2262 subsys_initcall(tc_filter_init);
Linux with added FPC-III support