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Linux 4.19.168
[linux/fpc-iii.git] / net / sched / cls_api.c
blob184c20b86393b4ae68322f21c8ac87cd9182df3b
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 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
35
36 /* The list of all installed classifier types */
37 static LIST_HEAD(tcf_proto_base);
38
39 /* Protects list of registered TC modules. It is pure SMP lock. */
40 static DEFINE_RWLOCK(cls_mod_lock);
41
42 /* Find classifier type by string name */
43
44 static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
45 {
46 const struct tcf_proto_ops *t, *res = NULL;
47
48 if (kind) {
49 read_lock(&cls_mod_lock);
50 list_for_each_entry(t, &tcf_proto_base, head) {
51 if (strcmp(kind, t->kind) == 0) {
52 if (try_module_get(t->owner))
53 res = t;
54 break;
55 }
56 }
57 read_unlock(&cls_mod_lock);
58 }
59 return res;
60 }
61
62 static const struct tcf_proto_ops *
63 tcf_proto_lookup_ops(const char *kind, struct netlink_ext_ack *extack)
64 {
65 const struct tcf_proto_ops *ops;
66
67 ops = __tcf_proto_lookup_ops(kind);
68 if (ops)
69 return ops;
70 #ifdef CONFIG_MODULES
71 rtnl_unlock();
72 request_module("cls_%s", kind);
73 rtnl_lock();
74 ops = __tcf_proto_lookup_ops(kind);
75 /* We dropped the RTNL semaphore in order to perform
76 * the module load. So, even if we succeeded in loading
77 * the module we have to replay the request. We indicate
78 * this using -EAGAIN.
79 */
80 if (ops) {
81 module_put(ops->owner);
82 return ERR_PTR(-EAGAIN);
83 }
84 #endif
85 NL_SET_ERR_MSG(extack, "TC classifier not found");
86 return ERR_PTR(-ENOENT);
87 }
88
89 /* Register(unregister) new classifier type */
90
91 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
92 {
93 struct tcf_proto_ops *t;
94 int rc = -EEXIST;
95
96 write_lock(&cls_mod_lock);
97 list_for_each_entry(t, &tcf_proto_base, head)
98 if (!strcmp(ops->kind, t->kind))
99 goto out;
100
101 list_add_tail(&ops->head, &tcf_proto_base);
102 rc = 0;
103 out:
104 write_unlock(&cls_mod_lock);
105 return rc;
106 }
107 EXPORT_SYMBOL(register_tcf_proto_ops);
108
109 static struct workqueue_struct *tc_filter_wq;
110
111 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
112 {
113 struct tcf_proto_ops *t;
114 int rc = -ENOENT;
115
116 /* Wait for outstanding call_rcu()s, if any, from a
117 * tcf_proto_ops's destroy() handler.
118 */
119 rcu_barrier();
120 flush_workqueue(tc_filter_wq);
121
122 write_lock(&cls_mod_lock);
123 list_for_each_entry(t, &tcf_proto_base, head) {
124 if (t == ops) {
125 list_del(&t->head);
126 rc = 0;
127 break;
128 }
129 }
130 write_unlock(&cls_mod_lock);
131 return rc;
132 }
133 EXPORT_SYMBOL(unregister_tcf_proto_ops);
134
135 bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
136 {
137 INIT_RCU_WORK(rwork, func);
138 return queue_rcu_work(tc_filter_wq, rwork);
139 }
140 EXPORT_SYMBOL(tcf_queue_work);
141
142 /* Select new prio value from the range, managed by kernel. */
143
144 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
145 {
146 u32 first = TC_H_MAKE(0xC0000000U, 0U);
147
148 if (tp)
149 first = tp->prio - 1;
150
151 return TC_H_MAJ(first);
152 }
153
154 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
155 u32 prio, struct tcf_chain *chain,
156 struct netlink_ext_ack *extack)
157 {
158 struct tcf_proto *tp;
159 int err;
160
161 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
162 if (!tp)
163 return ERR_PTR(-ENOBUFS);
164
165 tp->ops = tcf_proto_lookup_ops(kind, extack);
166 if (IS_ERR(tp->ops)) {
167 err = PTR_ERR(tp->ops);
168 goto errout;
169 }
170 tp->classify = tp->ops->classify;
171 tp->protocol = protocol;
172 tp->prio = prio;
173 tp->chain = chain;
174
175 err = tp->ops->init(tp);
176 if (err) {
177 module_put(tp->ops->owner);
178 goto errout;
179 }
180 return tp;
181
182 errout:
183 kfree(tp);
184 return ERR_PTR(err);
185 }
186
187 static void tcf_proto_destroy(struct tcf_proto *tp,
188 struct netlink_ext_ack *extack)
189 {
190 tp->ops->destroy(tp, extack);
191 module_put(tp->ops->owner);
192 kfree_rcu(tp, rcu);
193 }
194
195 struct tcf_filter_chain_list_item {
196 struct list_head list;
197 tcf_chain_head_change_t *chain_head_change;
198 void *chain_head_change_priv;
199 };
200
201 static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
202 u32 chain_index)
203 {
204 struct tcf_chain *chain;
205
206 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
207 if (!chain)
208 return NULL;
209 list_add_tail(&chain->list, &block->chain_list);
210 chain->block = block;
211 chain->index = chain_index;
212 chain->refcnt = 1;
213 if (!chain->index)
214 block->chain0.chain = chain;
215 return chain;
216 }
217
218 static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
219 struct tcf_proto *tp_head)
220 {
221 if (item->chain_head_change)
222 item->chain_head_change(tp_head, item->chain_head_change_priv);
223 }
224
225 static void tcf_chain0_head_change(struct tcf_chain *chain,
226 struct tcf_proto *tp_head)
227 {
228 struct tcf_filter_chain_list_item *item;
229 struct tcf_block *block = chain->block;
230
231 if (chain->index)
232 return;
233 list_for_each_entry(item, &block->chain0.filter_chain_list, list)
234 tcf_chain_head_change_item(item, tp_head);
235 }
236
237 static void tcf_chain_destroy(struct tcf_chain *chain)
238 {
239 struct tcf_block *block = chain->block;
240
241 list_del(&chain->list);
242 if (!chain->index)
243 block->chain0.chain = NULL;
244 kfree(chain);
245 if (list_empty(&block->chain_list) && block->refcnt == 0)
246 kfree(block);
247 }
248
249 static void tcf_chain_hold(struct tcf_chain *chain)
250 {
251 ++chain->refcnt;
252 }
253
254 static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
255 {
256 /* In case all the references are action references, this
257 * chain should not be shown to the user.
258 */
259 return chain->refcnt == chain->action_refcnt;
260 }
261
262 static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
263 u32 chain_index)
264 {
265 struct tcf_chain *chain;
266
267 list_for_each_entry(chain, &block->chain_list, list) {
268 if (chain->index == chain_index)
269 return chain;
270 }
271 return NULL;
272 }
273
274 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
275 u32 seq, u16 flags, int event, bool unicast);
276
277 static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
278 u32 chain_index, bool create,
279 bool by_act)
280 {
281 struct tcf_chain *chain = tcf_chain_lookup(block, chain_index);
282
283 if (chain) {
284 tcf_chain_hold(chain);
285 } else {
286 if (!create)
287 return NULL;
288 chain = tcf_chain_create(block, chain_index);
289 if (!chain)
290 return NULL;
291 }
292
293 if (by_act)
294 ++chain->action_refcnt;
295
296 /* Send notification only in case we got the first
297 * non-action reference. Until then, the chain acts only as
298 * a placeholder for actions pointing to it and user ought
299 * not know about them.
300 */
301 if (chain->refcnt - chain->action_refcnt == 1 && !by_act)
302 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
303 RTM_NEWCHAIN, false);
304
305 return chain;
306 }
307
308 static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
309 bool create)
310 {
311 return __tcf_chain_get(block, chain_index, create, false);
312 }
313
314 struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
315 {
316 return __tcf_chain_get(block, chain_index, true, true);
317 }
318 EXPORT_SYMBOL(tcf_chain_get_by_act);
319
320 static void tc_chain_tmplt_del(struct tcf_chain *chain);
321
322 static void __tcf_chain_put(struct tcf_chain *chain, bool by_act)
323 {
324 if (by_act)
325 chain->action_refcnt--;
326 chain->refcnt--;
327
328 /* The last dropped non-action reference will trigger notification. */
329 if (chain->refcnt - chain->action_refcnt == 0 && !by_act)
330 tc_chain_notify(chain, NULL, 0, 0, RTM_DELCHAIN, false);
331
332 if (chain->refcnt == 0) {
333 tc_chain_tmplt_del(chain);
334 tcf_chain_destroy(chain);
335 }
336 }
337
338 static void tcf_chain_put(struct tcf_chain *chain)
339 {
340 __tcf_chain_put(chain, false);
341 }
342
343 void tcf_chain_put_by_act(struct tcf_chain *chain)
344 {
345 __tcf_chain_put(chain, true);
346 }
347 EXPORT_SYMBOL(tcf_chain_put_by_act);
348
349 static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
350 {
351 if (chain->explicitly_created)
352 tcf_chain_put(chain);
353 }
354
355 static void tcf_chain_flush(struct tcf_chain *chain)
356 {
357 struct tcf_proto *tp = rtnl_dereference(chain->filter_chain);
358
359 tcf_chain0_head_change(chain, NULL);
360 while (tp) {
361 RCU_INIT_POINTER(chain->filter_chain, tp->next);
362 tcf_proto_destroy(tp, NULL);
363 tp = rtnl_dereference(chain->filter_chain);
364 tcf_chain_put(chain);
365 }
366 }
367
368 static bool tcf_block_offload_in_use(struct tcf_block *block)
369 {
370 return block->offloadcnt;
371 }
372
373 static int tcf_block_offload_cmd(struct tcf_block *block,
374 struct net_device *dev,
375 struct tcf_block_ext_info *ei,
376 enum tc_block_command command,
377 struct netlink_ext_ack *extack)
378 {
379 struct tc_block_offload bo = {};
380
381 bo.command = command;
382 bo.binder_type = ei->binder_type;
383 bo.block = block;
384 bo.extack = extack;
385 return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
386 }
387
388 static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
389 struct tcf_block_ext_info *ei,
390 struct netlink_ext_ack *extack)
391 {
392 struct net_device *dev = q->dev_queue->dev;
393 int err;
394
395 if (!dev->netdev_ops->ndo_setup_tc)
396 goto no_offload_dev_inc;
397
398 /* If tc offload feature is disabled and the block we try to bind
399 * to already has some offloaded filters, forbid to bind.
400 */
401 if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) {
402 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
403 return -EOPNOTSUPP;
404 }
405
406 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack);
407 if (err == -EOPNOTSUPP)
408 goto no_offload_dev_inc;
409 return err;
410
411 no_offload_dev_inc:
412 if (tcf_block_offload_in_use(block))
413 return -EOPNOTSUPP;
414 block->nooffloaddevcnt++;
415 return 0;
416 }
417
418 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
419 struct tcf_block_ext_info *ei)
420 {
421 struct net_device *dev = q->dev_queue->dev;
422 int err;
423
424 if (!dev->netdev_ops->ndo_setup_tc)
425 goto no_offload_dev_dec;
426 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL);
427 if (err == -EOPNOTSUPP)
428 goto no_offload_dev_dec;
429 return;
430
431 no_offload_dev_dec:
432 WARN_ON(block->nooffloaddevcnt-- == 0);
433 }
434
435 static int
436 tcf_chain0_head_change_cb_add(struct tcf_block *block,
437 struct tcf_block_ext_info *ei,
438 struct netlink_ext_ack *extack)
439 {
440 struct tcf_chain *chain0 = block->chain0.chain;
441 struct tcf_filter_chain_list_item *item;
442
443 item = kmalloc(sizeof(*item), GFP_KERNEL);
444 if (!item) {
445 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
446 return -ENOMEM;
447 }
448 item->chain_head_change = ei->chain_head_change;
449 item->chain_head_change_priv = ei->chain_head_change_priv;
450 if (chain0 && chain0->filter_chain)
451 tcf_chain_head_change_item(item, chain0->filter_chain);
452 list_add(&item->list, &block->chain0.filter_chain_list);
453 return 0;
454 }
455
456 static void
457 tcf_chain0_head_change_cb_del(struct tcf_block *block,
458 struct tcf_block_ext_info *ei)
459 {
460 struct tcf_chain *chain0 = block->chain0.chain;
461 struct tcf_filter_chain_list_item *item;
462
463 list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
464 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
465 (item->chain_head_change == ei->chain_head_change &&
466 item->chain_head_change_priv == ei->chain_head_change_priv)) {
467 if (chain0)
468 tcf_chain_head_change_item(item, NULL);
469 list_del(&item->list);
470 kfree(item);
471 return;
472 }
473 }
474 WARN_ON(1);
475 }
476
477 struct tcf_net {
478 struct idr idr;
479 };
480
481 static unsigned int tcf_net_id;
482
483 static int tcf_block_insert(struct tcf_block *block, struct net *net,
484 struct netlink_ext_ack *extack)
485 {
486 struct tcf_net *tn = net_generic(net, tcf_net_id);
487
488 return idr_alloc_u32(&tn->idr, block, &block->index, block->index,
489 GFP_KERNEL);
490 }
491
492 static void tcf_block_remove(struct tcf_block *block, struct net *net)
493 {
494 struct tcf_net *tn = net_generic(net, tcf_net_id);
495
496 idr_remove(&tn->idr, block->index);
497 }
498
499 static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
500 u32 block_index,
501 struct netlink_ext_ack *extack)
502 {
503 struct tcf_block *block;
504
505 block = kzalloc(sizeof(*block), GFP_KERNEL);
506 if (!block) {
507 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
508 return ERR_PTR(-ENOMEM);
509 }
510 INIT_LIST_HEAD(&block->chain_list);
511 INIT_LIST_HEAD(&block->cb_list);
512 INIT_LIST_HEAD(&block->owner_list);
513 INIT_LIST_HEAD(&block->chain0.filter_chain_list);
514
515 block->refcnt = 1;
516 block->net = net;
517 block->index = block_index;
518
519 /* Don't store q pointer for blocks which are shared */
520 if (!tcf_block_shared(block))
521 block->q = q;
522 return block;
523 }
524
525 static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
526 {
527 struct tcf_net *tn = net_generic(net, tcf_net_id);
528
529 return idr_find(&tn->idr, block_index);
530 }
531
532 /* Find tcf block.
533 * Set q, parent, cl when appropriate.
534 */
535
536 static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
537 u32 *parent, unsigned long *cl,
538 int ifindex, u32 block_index,
539 struct netlink_ext_ack *extack)
540 {
541 struct tcf_block *block;
542
543 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
544 block = tcf_block_lookup(net, block_index);
545 if (!block) {
546 NL_SET_ERR_MSG(extack, "Block of given index was not found");
547 return ERR_PTR(-EINVAL);
548 }
549 } else {
550 const struct Qdisc_class_ops *cops;
551 struct net_device *dev;
552
553 /* Find link */
554 dev = __dev_get_by_index(net, ifindex);
555 if (!dev)
556 return ERR_PTR(-ENODEV);
557
558 /* Find qdisc */
559 if (!*parent) {
560 *q = dev->qdisc;
561 *parent = (*q)->handle;
562 } else {
563 *q = qdisc_lookup(dev, TC_H_MAJ(*parent));
564 if (!*q) {
565 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
566 return ERR_PTR(-EINVAL);
567 }
568 }
569
570 /* Is it classful? */
571 cops = (*q)->ops->cl_ops;
572 if (!cops) {
573 NL_SET_ERR_MSG(extack, "Qdisc not classful");
574 return ERR_PTR(-EINVAL);
575 }
576
577 if (!cops->tcf_block) {
578 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
579 return ERR_PTR(-EOPNOTSUPP);
580 }
581
582 /* Do we search for filter, attached to class? */
583 if (TC_H_MIN(*parent)) {
584 *cl = cops->find(*q, *parent);
585 if (*cl == 0) {
586 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
587 return ERR_PTR(-ENOENT);
588 }
589 }
590
591 /* And the last stroke */
592 block = cops->tcf_block(*q, *cl, extack);
593 if (!block)
594 return ERR_PTR(-EINVAL);
595 if (tcf_block_shared(block)) {
596 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
597 return ERR_PTR(-EOPNOTSUPP);
598 }
599 }
600
601 return block;
602 }
603
604 struct tcf_block_owner_item {
605 struct list_head list;
606 struct Qdisc *q;
607 enum tcf_block_binder_type binder_type;
608 };
609
610 static void
611 tcf_block_owner_netif_keep_dst(struct tcf_block *block,
612 struct Qdisc *q,
613 enum tcf_block_binder_type binder_type)
614 {
615 if (block->keep_dst &&
616 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
617 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
618 netif_keep_dst(qdisc_dev(q));
619 }
620
621 void tcf_block_netif_keep_dst(struct tcf_block *block)
622 {
623 struct tcf_block_owner_item *item;
624
625 block->keep_dst = true;
626 list_for_each_entry(item, &block->owner_list, list)
627 tcf_block_owner_netif_keep_dst(block, item->q,
628 item->binder_type);
629 }
630 EXPORT_SYMBOL(tcf_block_netif_keep_dst);
631
632 static int tcf_block_owner_add(struct tcf_block *block,
633 struct Qdisc *q,
634 enum tcf_block_binder_type binder_type)
635 {
636 struct tcf_block_owner_item *item;
637
638 item = kmalloc(sizeof(*item), GFP_KERNEL);
639 if (!item)
640 return -ENOMEM;
641 item->q = q;
642 item->binder_type = binder_type;
643 list_add(&item->list, &block->owner_list);
644 return 0;
645 }
646
647 static void tcf_block_owner_del(struct tcf_block *block,
648 struct Qdisc *q,
649 enum tcf_block_binder_type binder_type)
650 {
651 struct tcf_block_owner_item *item;
652
653 list_for_each_entry(item, &block->owner_list, list) {
654 if (item->q == q && item->binder_type == binder_type) {
655 list_del(&item->list);
656 kfree(item);
657 return;
658 }
659 }
660 WARN_ON(1);
661 }
662
663 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
664 struct tcf_block_ext_info *ei,
665 struct netlink_ext_ack *extack)
666 {
667 struct net *net = qdisc_net(q);
668 struct tcf_block *block = NULL;
669 bool created = false;
670 int err;
671
672 if (ei->block_index) {
673 /* block_index not 0 means the shared block is requested */
674 block = tcf_block_lookup(net, ei->block_index);
675 if (block)
676 block->refcnt++;
677 }
678
679 if (!block) {
680 block = tcf_block_create(net, q, ei->block_index, extack);
681 if (IS_ERR(block))
682 return PTR_ERR(block);
683 created = true;
684 if (tcf_block_shared(block)) {
685 err = tcf_block_insert(block, net, extack);
686 if (err)
687 goto err_block_insert;
688 }
689 }
690
691 err = tcf_block_owner_add(block, q, ei->binder_type);
692 if (err)
693 goto err_block_owner_add;
694
695 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
696
697 err = tcf_chain0_head_change_cb_add(block, ei, extack);
698 if (err)
699 goto err_chain0_head_change_cb_add;
700
701 err = tcf_block_offload_bind(block, q, ei, extack);
702 if (err)
703 goto err_block_offload_bind;
704
705 *p_block = block;
706 return 0;
707
708 err_block_offload_bind:
709 tcf_chain0_head_change_cb_del(block, ei);
710 err_chain0_head_change_cb_add:
711 tcf_block_owner_del(block, q, ei->binder_type);
712 err_block_owner_add:
713 if (created) {
714 if (tcf_block_shared(block))
715 tcf_block_remove(block, net);
716 err_block_insert:
717 kfree(block);
718 } else {
719 block->refcnt--;
720 }
721 return err;
722 }
723 EXPORT_SYMBOL(tcf_block_get_ext);
724
725 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
726 {
727 struct tcf_proto __rcu **p_filter_chain = priv;
728
729 rcu_assign_pointer(*p_filter_chain, tp_head);
730 }
731
732 int tcf_block_get(struct tcf_block **p_block,
733 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
734 struct netlink_ext_ack *extack)
735 {
736 struct tcf_block_ext_info ei = {
737 .chain_head_change = tcf_chain_head_change_dflt,
738 .chain_head_change_priv = p_filter_chain,
739 };
740
741 WARN_ON(!p_filter_chain);
742 return tcf_block_get_ext(p_block, q, &ei, extack);
743 }
744 EXPORT_SYMBOL(tcf_block_get);
745
746 /* XXX: Standalone actions are not allowed to jump to any chain, and bound
747 * actions should be all removed after flushing.
748 */
749 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
750 struct tcf_block_ext_info *ei)
751 {
752 struct tcf_chain *chain, *tmp;
753
754 if (!block)
755 return;
756 tcf_chain0_head_change_cb_del(block, ei);
757 tcf_block_owner_del(block, q, ei->binder_type);
758
759 if (block->refcnt == 1) {
760 if (tcf_block_shared(block))
761 tcf_block_remove(block, block->net);
762
763 /* Hold a refcnt for all chains, so that they don't disappear
764 * while we are iterating.
765 */
766 list_for_each_entry(chain, &block->chain_list, list)
767 tcf_chain_hold(chain);
768
769 list_for_each_entry(chain, &block->chain_list, list)
770 tcf_chain_flush(chain);
771 }
772
773 tcf_block_offload_unbind(block, q, ei);
774
775 if (block->refcnt == 1) {
776 /* At this point, all the chains should have refcnt >= 1. */
777 list_for_each_entry_safe(chain, tmp, &block->chain_list, list) {
778 tcf_chain_put_explicitly_created(chain);
779 tcf_chain_put(chain);
780 }
781
782 block->refcnt--;
783 if (list_empty(&block->chain_list))
784 kfree(block);
785 } else {
786 block->refcnt--;
787 }
788 }
789 EXPORT_SYMBOL(tcf_block_put_ext);
790
791 void tcf_block_put(struct tcf_block *block)
792 {
793 struct tcf_block_ext_info ei = {0, };
794
795 if (!block)
796 return;
797 tcf_block_put_ext(block, block->q, &ei);
798 }
799
800 EXPORT_SYMBOL(tcf_block_put);
801
802 struct tcf_block_cb {
803 struct list_head list;
804 tc_setup_cb_t *cb;
805 void *cb_ident;
806 void *cb_priv;
807 unsigned int refcnt;
808 };
809
810 void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
811 {
812 return block_cb->cb_priv;
813 }
814 EXPORT_SYMBOL(tcf_block_cb_priv);
815
816 struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
817 tc_setup_cb_t *cb, void *cb_ident)
818 { struct tcf_block_cb *block_cb;
819
820 list_for_each_entry(block_cb, &block->cb_list, list)
821 if (block_cb->cb == cb && block_cb->cb_ident == cb_ident)
822 return block_cb;
823 return NULL;
824 }
825 EXPORT_SYMBOL(tcf_block_cb_lookup);
826
827 void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
828 {
829 block_cb->refcnt++;
830 }
831 EXPORT_SYMBOL(tcf_block_cb_incref);
832
833 unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
834 {
835 return --block_cb->refcnt;
836 }
837 EXPORT_SYMBOL(tcf_block_cb_decref);
838
839 static int
840 tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb,
841 void *cb_priv, bool add, bool offload_in_use,
842 struct netlink_ext_ack *extack)
843 {
844 struct tcf_chain *chain;
845 struct tcf_proto *tp;
846 int err;
847
848 list_for_each_entry(chain, &block->chain_list, list) {
849 for (tp = rtnl_dereference(chain->filter_chain); tp;
850 tp = rtnl_dereference(tp->next)) {
851 if (tp->ops->reoffload) {
852 err = tp->ops->reoffload(tp, add, cb, cb_priv,
853 extack);
854 if (err && add)
855 goto err_playback_remove;
856 } else if (add && offload_in_use) {
857 err = -EOPNOTSUPP;
858 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
859 goto err_playback_remove;
860 }
861 }
862 }
863
864 return 0;
865
866 err_playback_remove:
867 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
868 extack);
869 return err;
870 }
871
872 struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
873 tc_setup_cb_t *cb, void *cb_ident,
874 void *cb_priv,
875 struct netlink_ext_ack *extack)
876 {
877 struct tcf_block_cb *block_cb;
878 int err;
879
880 /* Replay any already present rules */
881 err = tcf_block_playback_offloads(block, cb, cb_priv, true,
882 tcf_block_offload_in_use(block),
883 extack);
884 if (err)
885 return ERR_PTR(err);
886
887 block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
888 if (!block_cb)
889 return ERR_PTR(-ENOMEM);
890 block_cb->cb = cb;
891 block_cb->cb_ident = cb_ident;
892 block_cb->cb_priv = cb_priv;
893 list_add(&block_cb->list, &block->cb_list);
894 return block_cb;
895 }
896 EXPORT_SYMBOL(__tcf_block_cb_register);
897
898 int tcf_block_cb_register(struct tcf_block *block,
899 tc_setup_cb_t *cb, void *cb_ident,
900 void *cb_priv, struct netlink_ext_ack *extack)
901 {
902 struct tcf_block_cb *block_cb;
903
904 block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv,
905 extack);
906 return PTR_ERR_OR_ZERO(block_cb);
907 }
908 EXPORT_SYMBOL(tcf_block_cb_register);
909
910 void __tcf_block_cb_unregister(struct tcf_block *block,
911 struct tcf_block_cb *block_cb)
912 {
913 tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv,
914 false, tcf_block_offload_in_use(block),
915 NULL);
916 list_del(&block_cb->list);
917 kfree(block_cb);
918 }
919 EXPORT_SYMBOL(__tcf_block_cb_unregister);
920
921 void tcf_block_cb_unregister(struct tcf_block *block,
922 tc_setup_cb_t *cb, void *cb_ident)
923 {
924 struct tcf_block_cb *block_cb;
925
926 block_cb = tcf_block_cb_lookup(block, cb, cb_ident);
927 if (!block_cb)
928 return;
929 __tcf_block_cb_unregister(block, block_cb);
930 }
931 EXPORT_SYMBOL(tcf_block_cb_unregister);
932
933 static int tcf_block_cb_call(struct tcf_block *block, enum tc_setup_type type,
934 void *type_data, bool err_stop)
935 {
936 struct tcf_block_cb *block_cb;
937 int ok_count = 0;
938 int err;
939
940 /* Make sure all netdevs sharing this block are offload-capable. */
941 if (block->nooffloaddevcnt && err_stop)
942 return -EOPNOTSUPP;
943
944 list_for_each_entry(block_cb, &block->cb_list, list) {
945 err = block_cb->cb(type, type_data, block_cb->cb_priv);
946 if (err) {
947 if (err_stop)
948 return err;
949 } else {
950 ok_count++;
951 }
952 }
953 return ok_count;
954 }
955
956 /* Main classifier routine: scans classifier chain attached
957 * to this qdisc, (optionally) tests for protocol and asks
958 * specific classifiers.
959 */
960 int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
961 struct tcf_result *res, bool compat_mode)
962 {
963 #ifdef CONFIG_NET_CLS_ACT
964 const int max_reclassify_loop = 4;
965 const struct tcf_proto *orig_tp = tp;
966 const struct tcf_proto *first_tp;
967 int limit = 0;
968
969 reclassify:
970 #endif
971 for (; tp; tp = rcu_dereference_bh(tp->next)) {
972 __be16 protocol = skb_protocol(skb, false);
973 int err;
974
975 if (tp->protocol != protocol &&
976 tp->protocol != htons(ETH_P_ALL))
977 continue;
978
979 err = tp->classify(skb, tp, res);
980 #ifdef CONFIG_NET_CLS_ACT
981 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
982 first_tp = orig_tp;
983 goto reset;
984 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
985 first_tp = res->goto_tp;
986 goto reset;
987 }
988 #endif
989 if (err >= 0)
990 return err;
991 }
992
993 return TC_ACT_UNSPEC; /* signal: continue lookup */
994 #ifdef CONFIG_NET_CLS_ACT
995 reset:
996 if (unlikely(limit++ >= max_reclassify_loop)) {
997 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
998 tp->chain->block->index,
999 tp->prio & 0xffff,
1000 ntohs(tp->protocol));
1001 return TC_ACT_SHOT;
1002 }
1003
1004 tp = first_tp;
1005 goto reclassify;
1006 #endif
1007 }
1008 EXPORT_SYMBOL(tcf_classify);
1009
1010 struct tcf_chain_info {
1011 struct tcf_proto __rcu **pprev;
1012 struct tcf_proto __rcu *next;
1013 };
1014
1015 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain_info *chain_info)
1016 {
1017 return rtnl_dereference(*chain_info->pprev);
1018 }
1019
1020 static void tcf_chain_tp_insert(struct tcf_chain *chain,
1021 struct tcf_chain_info *chain_info,
1022 struct tcf_proto *tp)
1023 {
1024 if (*chain_info->pprev == chain->filter_chain)
1025 tcf_chain0_head_change(chain, tp);
1026 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain_info));
1027 rcu_assign_pointer(*chain_info->pprev, tp);
1028 tcf_chain_hold(chain);
1029 }
1030
1031 static void tcf_chain_tp_remove(struct tcf_chain *chain,
1032 struct tcf_chain_info *chain_info,
1033 struct tcf_proto *tp)
1034 {
1035 struct tcf_proto *next = rtnl_dereference(chain_info->next);
1036
1037 if (tp == chain->filter_chain)
1038 tcf_chain0_head_change(chain, next);
1039 RCU_INIT_POINTER(*chain_info->pprev, next);
1040 tcf_chain_put(chain);
1041 }
1042
1043 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1044 struct tcf_chain_info *chain_info,
1045 u32 protocol, u32 prio,
1046 bool prio_allocate)
1047 {
1048 struct tcf_proto **pprev;
1049 struct tcf_proto *tp;
1050
1051 /* Check the chain for existence of proto-tcf with this priority */
1052 for (pprev = &chain->filter_chain;
1053 (tp = rtnl_dereference(*pprev)); pprev = &tp->next) {
1054 if (tp->prio >= prio) {
1055 if (tp->prio == prio) {
1056 if (prio_allocate ||
1057 (tp->protocol != protocol && protocol))
1058 return ERR_PTR(-EINVAL);
1059 } else {
1060 tp = NULL;
1061 }
1062 break;
1063 }
1064 }
1065 chain_info->pprev = pprev;
1066 chain_info->next = tp ? tp->next : NULL;
1067 return tp;
1068 }
1069
1070 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
1071 struct tcf_proto *tp, struct tcf_block *block,
1072 struct Qdisc *q, u32 parent, void *fh,
1073 u32 portid, u32 seq, u16 flags, int event)
1074 {
1075 struct tcmsg *tcm;
1076 struct nlmsghdr *nlh;
1077 unsigned char *b = skb_tail_pointer(skb);
1078
1079 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1080 if (!nlh)
1081 goto out_nlmsg_trim;
1082 tcm = nlmsg_data(nlh);
1083 tcm->tcm_family = AF_UNSPEC;
1084 tcm->tcm__pad1 = 0;
1085 tcm->tcm__pad2 = 0;
1086 if (q) {
1087 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1088 tcm->tcm_parent = parent;
1089 } else {
1090 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1091 tcm->tcm_block_index = block->index;
1092 }
1093 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
1094 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
1095 goto nla_put_failure;
1096 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
1097 goto nla_put_failure;
1098 if (!fh) {
1099 tcm->tcm_handle = 0;
1100 } else {
1101 if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0)
1102 goto nla_put_failure;
1103 }
1104 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1105 return skb->len;
1106
1107 out_nlmsg_trim:
1108 nla_put_failure:
1109 nlmsg_trim(skb, b);
1110 return -1;
1111 }
1112
1113 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
1114 struct nlmsghdr *n, struct tcf_proto *tp,
1115 struct tcf_block *block, struct Qdisc *q,
1116 u32 parent, void *fh, int event, bool unicast)
1117 {
1118 struct sk_buff *skb;
1119 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1120
1121 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1122 if (!skb)
1123 return -ENOBUFS;
1124
1125 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1126 n->nlmsg_seq, n->nlmsg_flags, event) <= 0) {
1127 kfree_skb(skb);
1128 return -EINVAL;
1129 }
1130
1131 if (unicast)
1132 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1133
1134 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1135 n->nlmsg_flags & NLM_F_ECHO);
1136 }
1137
1138 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
1139 struct nlmsghdr *n, struct tcf_proto *tp,
1140 struct tcf_block *block, struct Qdisc *q,
1141 u32 parent, void *fh, bool unicast, bool *last,
1142 struct netlink_ext_ack *extack)
1143 {
1144 struct sk_buff *skb;
1145 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1146 int err;
1147
1148 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1149 if (!skb)
1150 return -ENOBUFS;
1151
1152 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1153 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER) <= 0) {
1154 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
1155 kfree_skb(skb);
1156 return -EINVAL;
1157 }
1158
1159 err = tp->ops->delete(tp, fh, last, extack);
1160 if (err) {
1161 kfree_skb(skb);
1162 return err;
1163 }
1164
1165 if (unicast)
1166 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1167
1168 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1169 n->nlmsg_flags & NLM_F_ECHO);
1170 if (err < 0)
1171 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
1172 return err;
1173 }
1174
1175 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
1176 struct tcf_block *block, struct Qdisc *q,
1177 u32 parent, struct nlmsghdr *n,
1178 struct tcf_chain *chain, int event)
1179 {
1180 struct tcf_proto *tp;
1181
1182 for (tp = rtnl_dereference(chain->filter_chain);
1183 tp; tp = rtnl_dereference(tp->next))
1184 tfilter_notify(net, oskb, n, tp, block,
1185 q, parent, NULL, event, false);
1186 }
1187
1188 static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1189 struct netlink_ext_ack *extack)
1190 {
1191 struct net *net = sock_net(skb->sk);
1192 struct nlattr *tca[TCA_MAX + 1];
1193 struct tcmsg *t;
1194 u32 protocol;
1195 u32 prio;
1196 bool prio_allocate;
1197 u32 parent;
1198 u32 chain_index;
1199 struct Qdisc *q = NULL;
1200 struct tcf_chain_info chain_info;
1201 struct tcf_chain *chain = NULL;
1202 struct tcf_block *block;
1203 struct tcf_proto *tp;
1204 unsigned long cl;
1205 void *fh;
1206 int err;
1207 int tp_created;
1208
1209 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1210 return -EPERM;
1211
1212 replay:
1213 tp_created = 0;
1214
1215 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
1216 if (err < 0)
1217 return err;
1218
1219 t = nlmsg_data(n);
1220 protocol = TC_H_MIN(t->tcm_info);
1221 prio = TC_H_MAJ(t->tcm_info);
1222 prio_allocate = false;
1223 parent = t->tcm_parent;
1224 cl = 0;
1225
1226 if (prio == 0) {
1227 /* If no priority is provided by the user,
1228 * we allocate one.
1229 */
1230 if (n->nlmsg_flags & NLM_F_CREATE) {
1231 prio = TC_H_MAKE(0x80000000U, 0U);
1232 prio_allocate = true;
1233 } else {
1234 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
1235 return -ENOENT;
1236 }
1237 }
1238
1239 /* Find head of filter chain. */
1240
1241 block = tcf_block_find(net, &q, &parent, &cl,
1242 t->tcm_ifindex, t->tcm_block_index, extack);
1243 if (IS_ERR(block)) {
1244 err = PTR_ERR(block);
1245 goto errout;
1246 }
1247
1248 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
1249 if (chain_index > TC_ACT_EXT_VAL_MASK) {
1250 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
1251 err = -EINVAL;
1252 goto errout;
1253 }
1254 chain = tcf_chain_get(block, chain_index, true);
1255 if (!chain) {
1256 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
1257 err = -ENOMEM;
1258 goto errout;
1259 }
1260
1261 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
1262 prio, prio_allocate);
1263 if (IS_ERR(tp)) {
1264 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
1265 err = PTR_ERR(tp);
1266 goto errout;
1267 }
1268
1269 if (tp == NULL) {
1270 /* Proto-tcf does not exist, create new one */
1271
1272 if (tca[TCA_KIND] == NULL || !protocol) {
1273 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
1274 err = -EINVAL;
1275 goto errout;
1276 }
1277
1278 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1279 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
1280 err = -ENOENT;
1281 goto errout;
1282 }
1283
1284 if (prio_allocate)
1285 prio = tcf_auto_prio(tcf_chain_tp_prev(&chain_info));
1286
1287 tp = tcf_proto_create(nla_data(tca[TCA_KIND]),
1288 protocol, prio, chain, extack);
1289 if (IS_ERR(tp)) {
1290 err = PTR_ERR(tp);
1291 goto errout;
1292 }
1293 tp_created = 1;
1294 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
1295 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
1296 err = -EINVAL;
1297 goto errout;
1298 }
1299
1300 fh = tp->ops->get(tp, t->tcm_handle);
1301
1302 if (!fh) {
1303 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1304 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
1305 err = -ENOENT;
1306 goto errout;
1307 }
1308 } else if (n->nlmsg_flags & NLM_F_EXCL) {
1309 NL_SET_ERR_MSG(extack, "Filter already exists");
1310 err = -EEXIST;
1311 goto errout;
1312 }
1313
1314 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
1315 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
1316 err = -EINVAL;
1317 goto errout;
1318 }
1319
1320 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
1321 n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
1322 extack);
1323 if (err == 0) {
1324 if (tp_created)
1325 tcf_chain_tp_insert(chain, &chain_info, tp);
1326 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
1327 RTM_NEWTFILTER, false);
1328 /* q pointer is NULL for shared blocks */
1329 if (q)
1330 q->flags &= ~TCQ_F_CAN_BYPASS;
1331 } else {
1332 if (tp_created)
1333 tcf_proto_destroy(tp, NULL);
1334 }
1335
1336 errout:
1337 if (chain)
1338 tcf_chain_put(chain);
1339 if (err == -EAGAIN)
1340 /* Replay the request. */
1341 goto replay;
1342 return err;
1343 }
1344
1345 static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1346 struct netlink_ext_ack *extack)
1347 {
1348 struct net *net = sock_net(skb->sk);
1349 struct nlattr *tca[TCA_MAX + 1];
1350 struct tcmsg *t;
1351 u32 protocol;
1352 u32 prio;
1353 u32 parent;
1354 u32 chain_index;
1355 struct Qdisc *q = NULL;
1356 struct tcf_chain_info chain_info;
1357 struct tcf_chain *chain = NULL;
1358 struct tcf_block *block;
1359 struct tcf_proto *tp = NULL;
1360 unsigned long cl = 0;
1361 void *fh = NULL;
1362 int err;
1363
1364 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1365 return -EPERM;
1366
1367 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
1368 if (err < 0)
1369 return err;
1370
1371 t = nlmsg_data(n);
1372 protocol = TC_H_MIN(t->tcm_info);
1373 prio = TC_H_MAJ(t->tcm_info);
1374 parent = t->tcm_parent;
1375
1376 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
1377 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
1378 return -ENOENT;
1379 }
1380
1381 /* Find head of filter chain. */
1382
1383 block = tcf_block_find(net, &q, &parent, &cl,
1384 t->tcm_ifindex, t->tcm_block_index, extack);
1385 if (IS_ERR(block)) {
1386 err = PTR_ERR(block);
1387 goto errout;
1388 }
1389
1390 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
1391 if (chain_index > TC_ACT_EXT_VAL_MASK) {
1392 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
1393 err = -EINVAL;
1394 goto errout;
1395 }
1396 chain = tcf_chain_get(block, chain_index, false);
1397 if (!chain) {
1398 /* User requested flush on non-existent chain. Nothing to do,
1399 * so just return success.
1400 */
1401 if (prio == 0) {
1402 err = 0;
1403 goto errout;
1404 }
1405 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
1406 err = -ENOENT;
1407 goto errout;
1408 }
1409
1410 if (prio == 0) {
1411 tfilter_notify_chain(net, skb, block, q, parent, n,
1412 chain, RTM_DELTFILTER);
1413 tcf_chain_flush(chain);
1414 err = 0;
1415 goto errout;
1416 }
1417
1418 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
1419 prio, false);
1420 if (!tp || IS_ERR(tp)) {
1421 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
1422 err = tp ? PTR_ERR(tp) : -ENOENT;
1423 goto errout;
1424 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
1425 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
1426 err = -EINVAL;
1427 goto errout;
1428 }
1429
1430 fh = tp->ops->get(tp, t->tcm_handle);
1431
1432 if (!fh) {
1433 if (t->tcm_handle == 0) {
1434 tcf_chain_tp_remove(chain, &chain_info, tp);
1435 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
1436 RTM_DELTFILTER, false);
1437 tcf_proto_destroy(tp, extack);
1438 err = 0;
1439 } else {
1440 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
1441 err = -ENOENT;
1442 }
1443 } else {
1444 bool last;
1445
1446 err = tfilter_del_notify(net, skb, n, tp, block,
1447 q, parent, fh, false, &last,
1448 extack);
1449 if (err)
1450 goto errout;
1451 if (last) {
1452 tcf_chain_tp_remove(chain, &chain_info, tp);
1453 tcf_proto_destroy(tp, extack);
1454 }
1455 }
1456
1457 errout:
1458 if (chain)
1459 tcf_chain_put(chain);
1460 return err;
1461 }
1462
1463 static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1464 struct netlink_ext_ack *extack)
1465 {
1466 struct net *net = sock_net(skb->sk);
1467 struct nlattr *tca[TCA_MAX + 1];
1468 struct tcmsg *t;
1469 u32 protocol;
1470 u32 prio;
1471 u32 parent;
1472 u32 chain_index;
1473 struct Qdisc *q = NULL;
1474 struct tcf_chain_info chain_info;
1475 struct tcf_chain *chain = NULL;
1476 struct tcf_block *block;
1477 struct tcf_proto *tp = NULL;
1478 unsigned long cl = 0;
1479 void *fh = NULL;
1480 int err;
1481
1482 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
1483 if (err < 0)
1484 return err;
1485
1486 t = nlmsg_data(n);
1487 protocol = TC_H_MIN(t->tcm_info);
1488 prio = TC_H_MAJ(t->tcm_info);
1489 parent = t->tcm_parent;
1490
1491 if (prio == 0) {
1492 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
1493 return -ENOENT;
1494 }
1495
1496 /* Find head of filter chain. */
1497
1498 block = tcf_block_find(net, &q, &parent, &cl,
1499 t->tcm_ifindex, t->tcm_block_index, extack);
1500 if (IS_ERR(block)) {
1501 err = PTR_ERR(block);
1502 goto errout;
1503 }
1504
1505 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
1506 if (chain_index > TC_ACT_EXT_VAL_MASK) {
1507 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
1508 err = -EINVAL;
1509 goto errout;
1510 }
1511 chain = tcf_chain_get(block, chain_index, false);
1512 if (!chain) {
1513 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
1514 err = -EINVAL;
1515 goto errout;
1516 }
1517
1518 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
1519 prio, false);
1520 if (!tp || IS_ERR(tp)) {
1521 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
1522 err = tp ? PTR_ERR(tp) : -ENOENT;
1523 goto errout;
1524 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
1525 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
1526 err = -EINVAL;
1527 goto errout;
1528 }
1529
1530 fh = tp->ops->get(tp, t->tcm_handle);
1531
1532 if (!fh) {
1533 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
1534 err = -ENOENT;
1535 } else {
1536 err = tfilter_notify(net, skb, n, tp, block, q, parent,
1537 fh, RTM_NEWTFILTER, true);
1538 if (err < 0)
1539 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
1540 }
1541
1542 errout:
1543 if (chain)
1544 tcf_chain_put(chain);
1545 return err;
1546 }
1547
1548 struct tcf_dump_args {
1549 struct tcf_walker w;
1550 struct sk_buff *skb;
1551 struct netlink_callback *cb;
1552 struct tcf_block *block;
1553 struct Qdisc *q;
1554 u32 parent;
1555 };
1556
1557 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
1558 {
1559 struct tcf_dump_args *a = (void *)arg;
1560 struct net *net = sock_net(a->skb->sk);
1561
1562 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
1563 n, NETLINK_CB(a->cb->skb).portid,
1564 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
1565 RTM_NEWTFILTER);
1566 }
1567
1568 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
1569 struct sk_buff *skb, struct netlink_callback *cb,
1570 long index_start, long *p_index)
1571 {
1572 struct net *net = sock_net(skb->sk);
1573 struct tcf_block *block = chain->block;
1574 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1575 struct tcf_dump_args arg;
1576 struct tcf_proto *tp;
1577
1578 for (tp = rtnl_dereference(chain->filter_chain);
1579 tp; tp = rtnl_dereference(tp->next), (*p_index)++) {
1580 if (*p_index < index_start)
1581 continue;
1582 if (TC_H_MAJ(tcm->tcm_info) &&
1583 TC_H_MAJ(tcm->tcm_info) != tp->prio)
1584 continue;
1585 if (TC_H_MIN(tcm->tcm_info) &&
1586 TC_H_MIN(tcm->tcm_info) != tp->protocol)
1587 continue;
1588 if (*p_index > index_start)
1589 memset(&cb->args[1], 0,
1590 sizeof(cb->args) - sizeof(cb->args[0]));
1591 if (cb->args[1] == 0) {
1592 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
1593 NETLINK_CB(cb->skb).portid,
1594 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1595 RTM_NEWTFILTER) <= 0)
1596 return false;
1597
1598 cb->args[1] = 1;
1599 }
1600 if (!tp->ops->walk)
1601 continue;
1602 arg.w.fn = tcf_node_dump;
1603 arg.skb = skb;
1604 arg.cb = cb;
1605 arg.block = block;
1606 arg.q = q;
1607 arg.parent = parent;
1608 arg.w.stop = 0;
1609 arg.w.skip = cb->args[1] - 1;
1610 arg.w.count = 0;
1611 arg.w.cookie = cb->args[2];
1612 tp->ops->walk(tp, &arg.w);
1613 cb->args[2] = arg.w.cookie;
1614 cb->args[1] = arg.w.count + 1;
1615 if (arg.w.stop)
1616 return false;
1617 }
1618 return true;
1619 }
1620
1621 /* called with RTNL */
1622 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
1623 {
1624 struct net *net = sock_net(skb->sk);
1625 struct nlattr *tca[TCA_MAX + 1];
1626 struct Qdisc *q = NULL;
1627 struct tcf_block *block;
1628 struct tcf_chain *chain;
1629 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1630 long index_start;
1631 long index;
1632 u32 parent;
1633 int err;
1634
1635 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1636 return skb->len;
1637
1638 err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
1639 if (err)
1640 return err;
1641
1642 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1643 block = tcf_block_lookup(net, tcm->tcm_block_index);
1644 if (!block)
1645 goto out;
1646 /* If we work with block index, q is NULL and parent value
1647 * will never be used in the following code. The check
1648 * in tcf_fill_node prevents it. However, compiler does not
1649 * see that far, so set parent to zero to silence the warning
1650 * about parent being uninitialized.
1651 */
1652 parent = 0;
1653 } else {
1654 const struct Qdisc_class_ops *cops;
1655 struct net_device *dev;
1656 unsigned long cl = 0;
1657
1658 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1659 if (!dev)
1660 return skb->len;
1661
1662 parent = tcm->tcm_parent;
1663 if (!parent) {
1664 q = dev->qdisc;
1665 parent = q->handle;
1666 } else {
1667 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
1668 }
1669 if (!q)
1670 goto out;
1671 cops = q->ops->cl_ops;
1672 if (!cops)
1673 goto out;
1674 if (!cops->tcf_block)
1675 goto out;
1676 if (TC_H_MIN(tcm->tcm_parent)) {
1677 cl = cops->find(q, tcm->tcm_parent);
1678 if (cl == 0)
1679 goto out;
1680 }
1681 block = cops->tcf_block(q, cl, NULL);
1682 if (!block)
1683 goto out;
1684 if (tcf_block_shared(block))
1685 q = NULL;
1686 }
1687
1688 index_start = cb->args[0];
1689 index = 0;
1690
1691 list_for_each_entry(chain, &block->chain_list, list) {
1692 if (tca[TCA_CHAIN] &&
1693 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
1694 continue;
1695 if (!tcf_chain_dump(chain, q, parent, skb, cb,
1696 index_start, &index)) {
1697 err = -EMSGSIZE;
1698 break;
1699 }
1700 }
1701
1702 cb->args[0] = index;
1703
1704 out:
1705 /* If we did no progress, the error (EMSGSIZE) is real */
1706 if (skb->len == 0 && err)
1707 return err;
1708 return skb->len;
1709 }
1710
1711 static int tc_chain_fill_node(struct tcf_chain *chain, struct net *net,
1712 struct sk_buff *skb, struct tcf_block *block,
1713 u32 portid, u32 seq, u16 flags, int event)
1714 {
1715 unsigned char *b = skb_tail_pointer(skb);
1716 const struct tcf_proto_ops *ops;
1717 struct nlmsghdr *nlh;
1718 struct tcmsg *tcm;
1719 void *priv;
1720
1721 ops = chain->tmplt_ops;
1722 priv = chain->tmplt_priv;
1723
1724 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1725 if (!nlh)
1726 goto out_nlmsg_trim;
1727 tcm = nlmsg_data(nlh);
1728 tcm->tcm_family = AF_UNSPEC;
1729 tcm->tcm__pad1 = 0;
1730 tcm->tcm__pad2 = 0;
1731 tcm->tcm_handle = 0;
1732 if (block->q) {
1733 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
1734 tcm->tcm_parent = block->q->handle;
1735 } else {
1736 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1737 tcm->tcm_block_index = block->index;
1738 }
1739
1740 if (nla_put_u32(skb, TCA_CHAIN, chain->index))
1741 goto nla_put_failure;
1742
1743 if (ops) {
1744 if (nla_put_string(skb, TCA_KIND, ops->kind))
1745 goto nla_put_failure;
1746 if (ops->tmplt_dump(skb, net, priv) < 0)
1747 goto nla_put_failure;
1748 }
1749
1750 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1751 return skb->len;
1752
1753 out_nlmsg_trim:
1754 nla_put_failure:
1755 nlmsg_trim(skb, b);
1756 return -EMSGSIZE;
1757 }
1758
1759 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
1760 u32 seq, u16 flags, int event, bool unicast)
1761 {
1762 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1763 struct tcf_block *block = chain->block;
1764 struct net *net = block->net;
1765 struct sk_buff *skb;
1766
1767 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1768 if (!skb)
1769 return -ENOBUFS;
1770
1771 if (tc_chain_fill_node(chain, net, skb, block, portid,
1772 seq, flags, event) <= 0) {
1773 kfree_skb(skb);
1774 return -EINVAL;
1775 }
1776
1777 if (unicast)
1778 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1779
1780 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
1781 }
1782
1783 static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
1784 struct nlattr **tca,
1785 struct netlink_ext_ack *extack)
1786 {
1787 const struct tcf_proto_ops *ops;
1788 void *tmplt_priv;
1789
1790 /* If kind is not set, user did not specify template. */
1791 if (!tca[TCA_KIND])
1792 return 0;
1793
1794 ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), extack);
1795 if (IS_ERR(ops))
1796 return PTR_ERR(ops);
1797 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
1798 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
1799 return -EOPNOTSUPP;
1800 }
1801
1802 tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
1803 if (IS_ERR(tmplt_priv)) {
1804 module_put(ops->owner);
1805 return PTR_ERR(tmplt_priv);
1806 }
1807 chain->tmplt_ops = ops;
1808 chain->tmplt_priv = tmplt_priv;
1809 return 0;
1810 }
1811
1812 static void tc_chain_tmplt_del(struct tcf_chain *chain)
1813 {
1814 const struct tcf_proto_ops *ops = chain->tmplt_ops;
1815
1816 /* If template ops are set, no work to do for us. */
1817 if (!ops)
1818 return;
1819
1820 ops->tmplt_destroy(chain->tmplt_priv);
1821 module_put(ops->owner);
1822 }
1823
1824 /* Add/delete/get a chain */
1825
1826 static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
1827 struct netlink_ext_ack *extack)
1828 {
1829 struct net *net = sock_net(skb->sk);
1830 struct nlattr *tca[TCA_MAX + 1];
1831 struct tcmsg *t;
1832 u32 parent;
1833 u32 chain_index;
1834 struct Qdisc *q = NULL;
1835 struct tcf_chain *chain = NULL;
1836 struct tcf_block *block;
1837 unsigned long cl;
1838 int err;
1839
1840 if (n->nlmsg_type != RTM_GETCHAIN &&
1841 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1842 return -EPERM;
1843
1844 replay:
1845 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
1846 if (err < 0)
1847 return err;
1848
1849 t = nlmsg_data(n);
1850 parent = t->tcm_parent;
1851 cl = 0;
1852
1853 block = tcf_block_find(net, &q, &parent, &cl,
1854 t->tcm_ifindex, t->tcm_block_index, extack);
1855 if (IS_ERR(block))
1856 return PTR_ERR(block);
1857
1858 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
1859 if (chain_index > TC_ACT_EXT_VAL_MASK) {
1860 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
1861 return -EINVAL;
1862 }
1863 chain = tcf_chain_lookup(block, chain_index);
1864 if (n->nlmsg_type == RTM_NEWCHAIN) {
1865 if (chain) {
1866 if (tcf_chain_held_by_acts_only(chain)) {
1867 /* The chain exists only because there is
1868 * some action referencing it.
1869 */
1870 tcf_chain_hold(chain);
1871 } else {
1872 NL_SET_ERR_MSG(extack, "Filter chain already exists");
1873 return -EEXIST;
1874 }
1875 } else {
1876 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
1877 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
1878 return -ENOENT;
1879 }
1880 chain = tcf_chain_create(block, chain_index);
1881 if (!chain) {
1882 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
1883 return -ENOMEM;
1884 }
1885 }
1886 } else {
1887 if (!chain || tcf_chain_held_by_acts_only(chain)) {
1888 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
1889 return -EINVAL;
1890 }
1891 tcf_chain_hold(chain);
1892 }
1893
1894 switch (n->nlmsg_type) {
1895 case RTM_NEWCHAIN:
1896 err = tc_chain_tmplt_add(chain, net, tca, extack);
1897 if (err)
1898 goto errout;
1899 /* In case the chain was successfully added, take a reference
1900 * to the chain. This ensures that an empty chain
1901 * does not disappear at the end of this function.
1902 */
1903 tcf_chain_hold(chain);
1904 chain->explicitly_created = true;
1905 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
1906 RTM_NEWCHAIN, false);
1907 break;
1908 case RTM_DELCHAIN:
1909 tfilter_notify_chain(net, skb, block, q, parent, n,
1910 chain, RTM_DELTFILTER);
1911 /* Flush the chain first as the user requested chain removal. */
1912 tcf_chain_flush(chain);
1913 /* In case the chain was successfully deleted, put a reference
1914 * to the chain previously taken during addition.
1915 */
1916 tcf_chain_put_explicitly_created(chain);
1917 chain->explicitly_created = false;
1918 break;
1919 case RTM_GETCHAIN:
1920 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
1921 n->nlmsg_seq, n->nlmsg_type, true);
1922 if (err < 0)
1923 NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
1924 break;
1925 default:
1926 err = -EOPNOTSUPP;
1927 NL_SET_ERR_MSG(extack, "Unsupported message type");
1928 goto errout;
1929 }
1930
1931 errout:
1932 tcf_chain_put(chain);
1933 if (err == -EAGAIN)
1934 /* Replay the request. */
1935 goto replay;
1936 return err;
1937 }
1938
1939 /* called with RTNL */
1940 static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
1941 {
1942 struct net *net = sock_net(skb->sk);
1943 struct nlattr *tca[TCA_MAX + 1];
1944 struct Qdisc *q = NULL;
1945 struct tcf_block *block;
1946 struct tcf_chain *chain;
1947 struct tcmsg *tcm = nlmsg_data(cb->nlh);
1948 long index_start;
1949 long index;
1950 u32 parent;
1951 int err;
1952
1953 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
1954 return skb->len;
1955
1956 err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, rtm_tca_policy,
1957 NULL);
1958 if (err)
1959 return err;
1960
1961 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1962 block = tcf_block_lookup(net, tcm->tcm_block_index);
1963 if (!block)
1964 goto out;
1965 /* If we work with block index, q is NULL and parent value
1966 * will never be used in the following code. The check
1967 * in tcf_fill_node prevents it. However, compiler does not
1968 * see that far, so set parent to zero to silence the warning
1969 * about parent being uninitialized.
1970 */
1971 parent = 0;
1972 } else {
1973 const struct Qdisc_class_ops *cops;
1974 struct net_device *dev;
1975 unsigned long cl = 0;
1976
1977 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
1978 if (!dev)
1979 return skb->len;
1980
1981 parent = tcm->tcm_parent;
1982 if (!parent) {
1983 q = dev->qdisc;
1984 parent = q->handle;
1985 } else {
1986 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
1987 }
1988 if (!q)
1989 goto out;
1990 cops = q->ops->cl_ops;
1991 if (!cops)
1992 goto out;
1993 if (!cops->tcf_block)
1994 goto out;
1995 if (TC_H_MIN(tcm->tcm_parent)) {
1996 cl = cops->find(q, tcm->tcm_parent);
1997 if (cl == 0)
1998 goto out;
1999 }
2000 block = cops->tcf_block(q, cl, NULL);
2001 if (!block)
2002 goto out;
2003 if (tcf_block_shared(block))
2004 q = NULL;
2005 }
2006
2007 index_start = cb->args[0];
2008 index = 0;
2009
2010 list_for_each_entry(chain, &block->chain_list, list) {
2011 if ((tca[TCA_CHAIN] &&
2012 nla_get_u32(tca[TCA_CHAIN]) != chain->index))
2013 continue;
2014 if (index < index_start) {
2015 index++;
2016 continue;
2017 }
2018 if (tcf_chain_held_by_acts_only(chain))
2019 continue;
2020 err = tc_chain_fill_node(chain, net, skb, block,
2021 NETLINK_CB(cb->skb).portid,
2022 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2023 RTM_NEWCHAIN);
2024 if (err <= 0)
2025 break;
2026 index++;
2027 }
2028
2029 cb->args[0] = index;
2030
2031 out:
2032 /* If we did no progress, the error (EMSGSIZE) is real */
2033 if (skb->len == 0 && err)
2034 return err;
2035 return skb->len;
2036 }
2037
2038 void tcf_exts_destroy(struct tcf_exts *exts)
2039 {
2040 #ifdef CONFIG_NET_CLS_ACT
2041 if (exts->actions) {
2042 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
2043 kfree(exts->actions);
2044 }
2045 exts->nr_actions = 0;
2046 #endif
2047 }
2048 EXPORT_SYMBOL(tcf_exts_destroy);
2049
2050 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
2051 struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
2052 struct netlink_ext_ack *extack)
2053 {
2054 #ifdef CONFIG_NET_CLS_ACT
2055 {
2056 struct tc_action *act;
2057 size_t attr_size = 0;
2058
2059 if (exts->police && tb[exts->police]) {
2060 act = tcf_action_init_1(net, tp, tb[exts->police],
2061 rate_tlv, "police", ovr,
2062 TCA_ACT_BIND, true, extack);
2063 if (IS_ERR(act))
2064 return PTR_ERR(act);
2065
2066 act->type = exts->type = TCA_OLD_COMPAT;
2067 exts->actions[0] = act;
2068 exts->nr_actions = 1;
2069 } else if (exts->action && tb[exts->action]) {
2070 int err;
2071
2072 err = tcf_action_init(net, tp, tb[exts->action],
2073 rate_tlv, NULL, ovr, TCA_ACT_BIND,
2074 exts->actions, &attr_size, true,
2075 extack);
2076 if (err < 0)
2077 return err;
2078 exts->nr_actions = err;
2079 }
2080 exts->net = net;
2081 }
2082 #else
2083 if ((exts->action && tb[exts->action]) ||
2084 (exts->police && tb[exts->police])) {
2085 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
2086 return -EOPNOTSUPP;
2087 }
2088 #endif
2089
2090 return 0;
2091 }
2092 EXPORT_SYMBOL(tcf_exts_validate);
2093
2094 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
2095 {
2096 #ifdef CONFIG_NET_CLS_ACT
2097 struct tcf_exts old = *dst;
2098
2099 *dst = *src;
2100 tcf_exts_destroy(&old);
2101 #endif
2102 }
2103 EXPORT_SYMBOL(tcf_exts_change);
2104
2105 #ifdef CONFIG_NET_CLS_ACT
2106 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
2107 {
2108 if (exts->nr_actions == 0)
2109 return NULL;
2110 else
2111 return exts->actions[0];
2112 }
2113 #endif
2114
2115 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
2116 {
2117 #ifdef CONFIG_NET_CLS_ACT
2118 struct nlattr *nest;
2119
2120 if (exts->action && tcf_exts_has_actions(exts)) {
2121 /*
2122 * again for backward compatible mode - we want
2123 * to work with both old and new modes of entering
2124 * tc data even if iproute2 was newer - jhs
2125 */
2126 if (exts->type != TCA_OLD_COMPAT) {
2127 nest = nla_nest_start(skb, exts->action);
2128 if (nest == NULL)
2129 goto nla_put_failure;
2130
2131 if (tcf_action_dump(skb, exts->actions, 0, 0) < 0)
2132 goto nla_put_failure;
2133 nla_nest_end(skb, nest);
2134 } else if (exts->police) {
2135 struct tc_action *act = tcf_exts_first_act(exts);
2136 nest = nla_nest_start(skb, exts->police);
2137 if (nest == NULL || !act)
2138 goto nla_put_failure;
2139 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
2140 goto nla_put_failure;
2141 nla_nest_end(skb, nest);
2142 }
2143 }
2144 return 0;
2145
2146 nla_put_failure:
2147 nla_nest_cancel(skb, nest);
2148 return -1;
2149 #else
2150 return 0;
2151 #endif
2152 }
2153 EXPORT_SYMBOL(tcf_exts_dump);
2154
2155
2156 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
2157 {
2158 #ifdef CONFIG_NET_CLS_ACT
2159 struct tc_action *a = tcf_exts_first_act(exts);
2160 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
2161 return -1;
2162 #endif
2163 return 0;
2164 }
2165 EXPORT_SYMBOL(tcf_exts_dump_stats);
2166
2167 static int tc_exts_setup_cb_egdev_call(struct tcf_exts *exts,
2168 enum tc_setup_type type,
2169 void *type_data, bool err_stop)
2170 {
2171 int ok_count = 0;
2172 #ifdef CONFIG_NET_CLS_ACT
2173 const struct tc_action *a;
2174 struct net_device *dev;
2175 int i, ret;
2176
2177 if (!tcf_exts_has_actions(exts))
2178 return 0;
2179
2180 for (i = 0; i < exts->nr_actions; i++) {
2181 a = exts->actions[i];
2182 if (!a->ops->get_dev)
2183 continue;
2184 dev = a->ops->get_dev(a);
2185 if (!dev)
2186 continue;
2187 ret = tc_setup_cb_egdev_call(dev, type, type_data, err_stop);
2188 a->ops->put_dev(dev);
2189 if (ret < 0)
2190 return ret;
2191 ok_count += ret;
2192 }
2193 #endif
2194 return ok_count;
2195 }
2196
2197 int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
2198 enum tc_setup_type type, void *type_data, bool err_stop)
2199 {
2200 int ok_count;
2201 int ret;
2202
2203 ret = tcf_block_cb_call(block, type, type_data, err_stop);
2204 if (ret < 0)
2205 return ret;
2206 ok_count = ret;
2207
2208 if (!exts || ok_count)
2209 return ok_count;
2210 ret = tc_exts_setup_cb_egdev_call(exts, type, type_data, err_stop);
2211 if (ret < 0)
2212 return ret;
2213 ok_count += ret;
2214
2215 return ok_count;
2216 }
2217 EXPORT_SYMBOL(tc_setup_cb_call);
2218
2219 static __net_init int tcf_net_init(struct net *net)
2220 {
2221 struct tcf_net *tn = net_generic(net, tcf_net_id);
2222
2223 idr_init(&tn->idr);
2224 return 0;
2225 }
2226
2227 static void __net_exit tcf_net_exit(struct net *net)
2228 {
2229 struct tcf_net *tn = net_generic(net, tcf_net_id);
2230
2231 idr_destroy(&tn->idr);
2232 }
2233
2234 static struct pernet_operations tcf_net_ops = {
2235 .init = tcf_net_init,
2236 .exit = tcf_net_exit,
2237 .id = &tcf_net_id,
2238 .size = sizeof(struct tcf_net),
2239 };
2240
2241 static int __init tc_filter_init(void)
2242 {
2243 int err;
2244
2245 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
2246 if (!tc_filter_wq)
2247 return -ENOMEM;
2248
2249 err = register_pernet_subsys(&tcf_net_ops);
2250 if (err)
2251 goto err_register_pernet_subsys;
2252
2253 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL, 0);
2254 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL, 0);
2255 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
2256 tc_dump_tfilter, 0);
2257 rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
2258 rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
2259 rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
2260 tc_dump_chain, 0);
2261
2262 return 0;
2263
2264 err_register_pernet_subsys:
2265 destroy_workqueue(tc_filter_wq);
2266 return err;
2267 }
2268
2269 subsys_initcall(tc_filter_init);
Linux with added FPC-III support