2 * net/sched/cls_api.c Packet classifier API.
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.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
13 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
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 <linux/rhashtable.h>
29 #include <net/net_namespace.h>
31 #include <net/netlink.h>
32 #include <net/pkt_sched.h>
33 #include <net/pkt_cls.h>
34 #include <net/tc_act/tc_pedit.h>
35 #include <net/tc_act/tc_mirred.h>
36 #include <net/tc_act/tc_vlan.h>
37 #include <net/tc_act/tc_tunnel_key.h>
38 #include <net/tc_act/tc_csum.h>
39 #include <net/tc_act/tc_gact.h>
40 #include <net/tc_act/tc_skbedit.h>
42 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
44 /* The list of all installed classifier types */
45 static LIST_HEAD(tcf_proto_base);
47 /* Protects list of registered TC modules. It is pure SMP lock. */
48 static DEFINE_RWLOCK(cls_mod_lock);
50 /* Find classifier type by string name */
52 static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
54 const struct tcf_proto_ops *t, *res = NULL;
57 read_lock(&cls_mod_lock);
58 list_for_each_entry(t, &tcf_proto_base, head) {
59 if (strcmp(kind, t->kind) == 0) {
60 if (try_module_get(t->owner))
65 read_unlock(&cls_mod_lock);
70 static const struct tcf_proto_ops *
71 tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
72 struct netlink_ext_ack *extack)
74 const struct tcf_proto_ops *ops;
76 ops = __tcf_proto_lookup_ops(kind);
82 request_module("cls_%s", kind);
85 ops = __tcf_proto_lookup_ops(kind);
86 /* We dropped the RTNL semaphore in order to perform
87 * the module load. So, even if we succeeded in loading
88 * the module we have to replay the request. We indicate
92 module_put(ops->owner);
93 return ERR_PTR(-EAGAIN);
96 NL_SET_ERR_MSG(extack, "TC classifier not found");
97 return ERR_PTR(-ENOENT);
100 /* Register(unregister) new classifier type */
102 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
104 struct tcf_proto_ops *t;
107 write_lock(&cls_mod_lock);
108 list_for_each_entry(t, &tcf_proto_base, head)
109 if (!strcmp(ops->kind, t->kind))
112 list_add_tail(&ops->head, &tcf_proto_base);
115 write_unlock(&cls_mod_lock);
118 EXPORT_SYMBOL(register_tcf_proto_ops);
120 static struct workqueue_struct *tc_filter_wq;
122 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
124 struct tcf_proto_ops *t;
127 /* Wait for outstanding call_rcu()s, if any, from a
128 * tcf_proto_ops's destroy() handler.
131 flush_workqueue(tc_filter_wq);
133 write_lock(&cls_mod_lock);
134 list_for_each_entry(t, &tcf_proto_base, head) {
141 write_unlock(&cls_mod_lock);
144 EXPORT_SYMBOL(unregister_tcf_proto_ops);
146 bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
148 INIT_RCU_WORK(rwork, func);
149 return queue_rcu_work(tc_filter_wq, rwork);
151 EXPORT_SYMBOL(tcf_queue_work);
153 /* Select new prio value from the range, managed by kernel. */
155 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
157 u32 first = TC_H_MAKE(0xC0000000U, 0U);
160 first = tp->prio - 1;
162 return TC_H_MAJ(first);
165 static bool tcf_proto_is_unlocked(const char *kind)
167 const struct tcf_proto_ops *ops;
170 ops = tcf_proto_lookup_ops(kind, false, NULL);
171 /* On error return false to take rtnl lock. Proto lookup/create
172 * functions will perform lookup again and properly handle errors.
177 ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED);
178 module_put(ops->owner);
182 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
183 u32 prio, struct tcf_chain *chain,
185 struct netlink_ext_ack *extack)
187 struct tcf_proto *tp;
190 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
192 return ERR_PTR(-ENOBUFS);
194 tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack);
195 if (IS_ERR(tp->ops)) {
196 err = PTR_ERR(tp->ops);
199 tp->classify = tp->ops->classify;
200 tp->protocol = protocol;
203 spin_lock_init(&tp->lock);
204 refcount_set(&tp->refcnt, 1);
206 err = tp->ops->init(tp);
208 module_put(tp->ops->owner);
218 static void tcf_proto_get(struct tcf_proto *tp)
220 refcount_inc(&tp->refcnt);
223 static void tcf_chain_put(struct tcf_chain *chain);
225 static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
226 struct netlink_ext_ack *extack)
228 tp->ops->destroy(tp, rtnl_held, extack);
229 tcf_chain_put(tp->chain);
230 module_put(tp->ops->owner);
234 static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held,
235 struct netlink_ext_ack *extack)
237 if (refcount_dec_and_test(&tp->refcnt))
238 tcf_proto_destroy(tp, rtnl_held, extack);
241 static int walker_check_empty(struct tcf_proto *tp, void *fh,
242 struct tcf_walker *arg)
245 arg->nonempty = true;
251 static bool tcf_proto_is_empty(struct tcf_proto *tp, bool rtnl_held)
253 struct tcf_walker walker = { .fn = walker_check_empty, };
256 tp->ops->walk(tp, &walker, rtnl_held);
257 return !walker.nonempty;
262 static bool tcf_proto_check_delete(struct tcf_proto *tp, bool rtnl_held)
264 spin_lock(&tp->lock);
265 if (tcf_proto_is_empty(tp, rtnl_held))
267 spin_unlock(&tp->lock);
271 static void tcf_proto_mark_delete(struct tcf_proto *tp)
273 spin_lock(&tp->lock);
275 spin_unlock(&tp->lock);
278 static bool tcf_proto_is_deleting(struct tcf_proto *tp)
282 spin_lock(&tp->lock);
283 deleting = tp->deleting;
284 spin_unlock(&tp->lock);
289 #define ASSERT_BLOCK_LOCKED(block) \
290 lockdep_assert_held(&(block)->lock)
292 struct tcf_filter_chain_list_item {
293 struct list_head list;
294 tcf_chain_head_change_t *chain_head_change;
295 void *chain_head_change_priv;
298 static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
301 struct tcf_chain *chain;
303 ASSERT_BLOCK_LOCKED(block);
305 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
308 list_add_tail(&chain->list, &block->chain_list);
309 mutex_init(&chain->filter_chain_lock);
310 chain->block = block;
311 chain->index = chain_index;
314 block->chain0.chain = chain;
318 static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
319 struct tcf_proto *tp_head)
321 if (item->chain_head_change)
322 item->chain_head_change(tp_head, item->chain_head_change_priv);
325 static void tcf_chain0_head_change(struct tcf_chain *chain,
326 struct tcf_proto *tp_head)
328 struct tcf_filter_chain_list_item *item;
329 struct tcf_block *block = chain->block;
334 mutex_lock(&block->lock);
335 list_for_each_entry(item, &block->chain0.filter_chain_list, list)
336 tcf_chain_head_change_item(item, tp_head);
337 mutex_unlock(&block->lock);
340 /* Returns true if block can be safely freed. */
342 static bool tcf_chain_detach(struct tcf_chain *chain)
344 struct tcf_block *block = chain->block;
346 ASSERT_BLOCK_LOCKED(block);
348 list_del(&chain->list);
350 block->chain0.chain = NULL;
352 if (list_empty(&block->chain_list) &&
353 refcount_read(&block->refcnt) == 0)
359 static void tcf_block_destroy(struct tcf_block *block)
361 mutex_destroy(&block->lock);
362 kfree_rcu(block, rcu);
365 static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block)
367 struct tcf_block *block = chain->block;
369 mutex_destroy(&chain->filter_chain_lock);
372 tcf_block_destroy(block);
375 static void tcf_chain_hold(struct tcf_chain *chain)
377 ASSERT_BLOCK_LOCKED(chain->block);
382 static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
384 ASSERT_BLOCK_LOCKED(chain->block);
386 /* In case all the references are action references, this
387 * chain should not be shown to the user.
389 return chain->refcnt == chain->action_refcnt;
392 static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
395 struct tcf_chain *chain;
397 ASSERT_BLOCK_LOCKED(block);
399 list_for_each_entry(chain, &block->chain_list, list) {
400 if (chain->index == chain_index)
406 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
407 u32 seq, u16 flags, int event, bool unicast);
409 static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
410 u32 chain_index, bool create,
413 struct tcf_chain *chain = NULL;
414 bool is_first_reference;
416 mutex_lock(&block->lock);
417 chain = tcf_chain_lookup(block, chain_index);
419 tcf_chain_hold(chain);
423 chain = tcf_chain_create(block, chain_index);
429 ++chain->action_refcnt;
430 is_first_reference = chain->refcnt - chain->action_refcnt == 1;
431 mutex_unlock(&block->lock);
433 /* Send notification only in case we got the first
434 * non-action reference. Until then, the chain acts only as
435 * a placeholder for actions pointing to it and user ought
436 * not know about them.
438 if (is_first_reference && !by_act)
439 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
440 RTM_NEWCHAIN, false);
445 mutex_unlock(&block->lock);
449 static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
452 return __tcf_chain_get(block, chain_index, create, false);
455 struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
457 return __tcf_chain_get(block, chain_index, true, true);
459 EXPORT_SYMBOL(tcf_chain_get_by_act);
461 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
463 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
464 void *tmplt_priv, u32 chain_index,
465 struct tcf_block *block, struct sk_buff *oskb,
466 u32 seq, u16 flags, bool unicast);
468 static void __tcf_chain_put(struct tcf_chain *chain, bool by_act,
469 bool explicitly_created)
471 struct tcf_block *block = chain->block;
472 const struct tcf_proto_ops *tmplt_ops;
473 bool free_block = false;
477 mutex_lock(&block->lock);
478 if (explicitly_created) {
479 if (!chain->explicitly_created) {
480 mutex_unlock(&block->lock);
483 chain->explicitly_created = false;
487 chain->action_refcnt--;
489 /* tc_chain_notify_delete can't be called while holding block lock.
490 * However, when block is unlocked chain can be changed concurrently, so
491 * save these to temporary variables.
493 refcnt = --chain->refcnt;
494 tmplt_ops = chain->tmplt_ops;
495 tmplt_priv = chain->tmplt_priv;
497 /* The last dropped non-action reference will trigger notification. */
498 if (refcnt - chain->action_refcnt == 0 && !by_act) {
499 tc_chain_notify_delete(tmplt_ops, tmplt_priv, chain->index,
500 block, NULL, 0, 0, false);
501 /* Last reference to chain, no need to lock. */
502 chain->flushing = false;
506 free_block = tcf_chain_detach(chain);
507 mutex_unlock(&block->lock);
510 tc_chain_tmplt_del(tmplt_ops, tmplt_priv);
511 tcf_chain_destroy(chain, free_block);
515 static void tcf_chain_put(struct tcf_chain *chain)
517 __tcf_chain_put(chain, false, false);
520 void tcf_chain_put_by_act(struct tcf_chain *chain)
522 __tcf_chain_put(chain, true, false);
524 EXPORT_SYMBOL(tcf_chain_put_by_act);
526 static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
528 __tcf_chain_put(chain, false, true);
531 static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
533 struct tcf_proto *tp, *tp_next;
535 mutex_lock(&chain->filter_chain_lock);
536 tp = tcf_chain_dereference(chain->filter_chain, chain);
537 RCU_INIT_POINTER(chain->filter_chain, NULL);
538 tcf_chain0_head_change(chain, NULL);
539 chain->flushing = true;
540 mutex_unlock(&chain->filter_chain_lock);
543 tp_next = rcu_dereference_protected(tp->next, 1);
544 tcf_proto_put(tp, rtnl_held, NULL);
549 static struct tcf_block *tc_dev_ingress_block(struct net_device *dev)
551 const struct Qdisc_class_ops *cops;
554 if (!dev_ingress_queue(dev))
557 qdisc = dev_ingress_queue(dev)->qdisc_sleeping;
561 cops = qdisc->ops->cl_ops;
565 if (!cops->tcf_block)
568 return cops->tcf_block(qdisc, TC_H_MIN_INGRESS, NULL);
571 static struct rhashtable indr_setup_block_ht;
573 struct tc_indr_block_dev {
574 struct rhash_head ht_node;
575 struct net_device *dev;
577 struct list_head cb_list;
578 struct tcf_block *block;
581 struct tc_indr_block_cb {
582 struct list_head list;
584 tc_indr_block_bind_cb_t *cb;
588 static const struct rhashtable_params tc_indr_setup_block_ht_params = {
589 .key_offset = offsetof(struct tc_indr_block_dev, dev),
590 .head_offset = offsetof(struct tc_indr_block_dev, ht_node),
591 .key_len = sizeof(struct net_device *),
594 static struct tc_indr_block_dev *
595 tc_indr_block_dev_lookup(struct net_device *dev)
597 return rhashtable_lookup_fast(&indr_setup_block_ht, &dev,
598 tc_indr_setup_block_ht_params);
601 static struct tc_indr_block_dev *tc_indr_block_dev_get(struct net_device *dev)
603 struct tc_indr_block_dev *indr_dev;
605 indr_dev = tc_indr_block_dev_lookup(dev);
609 indr_dev = kzalloc(sizeof(*indr_dev), GFP_KERNEL);
613 INIT_LIST_HEAD(&indr_dev->cb_list);
615 indr_dev->block = tc_dev_ingress_block(dev);
616 if (rhashtable_insert_fast(&indr_setup_block_ht, &indr_dev->ht_node,
617 tc_indr_setup_block_ht_params)) {
627 static void tc_indr_block_dev_put(struct tc_indr_block_dev *indr_dev)
629 if (--indr_dev->refcnt)
632 rhashtable_remove_fast(&indr_setup_block_ht, &indr_dev->ht_node,
633 tc_indr_setup_block_ht_params);
637 static struct tc_indr_block_cb *
638 tc_indr_block_cb_lookup(struct tc_indr_block_dev *indr_dev,
639 tc_indr_block_bind_cb_t *cb, void *cb_ident)
641 struct tc_indr_block_cb *indr_block_cb;
643 list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
644 if (indr_block_cb->cb == cb &&
645 indr_block_cb->cb_ident == cb_ident)
646 return indr_block_cb;
650 static struct tc_indr_block_cb *
651 tc_indr_block_cb_add(struct tc_indr_block_dev *indr_dev, void *cb_priv,
652 tc_indr_block_bind_cb_t *cb, void *cb_ident)
654 struct tc_indr_block_cb *indr_block_cb;
656 indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident);
658 return ERR_PTR(-EEXIST);
660 indr_block_cb = kzalloc(sizeof(*indr_block_cb), GFP_KERNEL);
662 return ERR_PTR(-ENOMEM);
664 indr_block_cb->cb_priv = cb_priv;
665 indr_block_cb->cb = cb;
666 indr_block_cb->cb_ident = cb_ident;
667 list_add(&indr_block_cb->list, &indr_dev->cb_list);
669 return indr_block_cb;
672 static void tc_indr_block_cb_del(struct tc_indr_block_cb *indr_block_cb)
674 list_del(&indr_block_cb->list);
675 kfree(indr_block_cb);
678 static void tc_indr_block_ing_cmd(struct tc_indr_block_dev *indr_dev,
679 struct tc_indr_block_cb *indr_block_cb,
680 enum tc_block_command command)
682 struct tc_block_offload bo = {
684 .binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
685 .block = indr_dev->block,
688 if (!indr_dev->block)
691 indr_block_cb->cb(indr_dev->dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
695 int __tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
696 tc_indr_block_bind_cb_t *cb, void *cb_ident)
698 struct tc_indr_block_cb *indr_block_cb;
699 struct tc_indr_block_dev *indr_dev;
702 indr_dev = tc_indr_block_dev_get(dev);
706 indr_block_cb = tc_indr_block_cb_add(indr_dev, cb_priv, cb, cb_ident);
707 err = PTR_ERR_OR_ZERO(indr_block_cb);
711 tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_BIND);
715 tc_indr_block_dev_put(indr_dev);
718 EXPORT_SYMBOL_GPL(__tc_indr_block_cb_register);
720 int tc_indr_block_cb_register(struct net_device *dev, void *cb_priv,
721 tc_indr_block_bind_cb_t *cb, void *cb_ident)
726 err = __tc_indr_block_cb_register(dev, cb_priv, cb, cb_ident);
731 EXPORT_SYMBOL_GPL(tc_indr_block_cb_register);
733 void __tc_indr_block_cb_unregister(struct net_device *dev,
734 tc_indr_block_bind_cb_t *cb, void *cb_ident)
736 struct tc_indr_block_cb *indr_block_cb;
737 struct tc_indr_block_dev *indr_dev;
739 indr_dev = tc_indr_block_dev_lookup(dev);
743 indr_block_cb = tc_indr_block_cb_lookup(indr_dev, cb, cb_ident);
747 /* Send unbind message if required to free any block cbs. */
748 tc_indr_block_ing_cmd(indr_dev, indr_block_cb, TC_BLOCK_UNBIND);
749 tc_indr_block_cb_del(indr_block_cb);
750 tc_indr_block_dev_put(indr_dev);
752 EXPORT_SYMBOL_GPL(__tc_indr_block_cb_unregister);
754 void tc_indr_block_cb_unregister(struct net_device *dev,
755 tc_indr_block_bind_cb_t *cb, void *cb_ident)
758 __tc_indr_block_cb_unregister(dev, cb, cb_ident);
761 EXPORT_SYMBOL_GPL(tc_indr_block_cb_unregister);
763 static void tc_indr_block_call(struct tcf_block *block, struct net_device *dev,
764 struct tcf_block_ext_info *ei,
765 enum tc_block_command command,
766 struct netlink_ext_ack *extack)
768 struct tc_indr_block_cb *indr_block_cb;
769 struct tc_indr_block_dev *indr_dev;
770 struct tc_block_offload bo = {
772 .binder_type = ei->binder_type,
777 indr_dev = tc_indr_block_dev_lookup(dev);
781 indr_dev->block = command == TC_BLOCK_BIND ? block : NULL;
783 list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
784 indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
788 static bool tcf_block_offload_in_use(struct tcf_block *block)
790 return block->offloadcnt;
793 static int tcf_block_offload_cmd(struct tcf_block *block,
794 struct net_device *dev,
795 struct tcf_block_ext_info *ei,
796 enum tc_block_command command,
797 struct netlink_ext_ack *extack)
799 struct tc_block_offload bo = {};
801 bo.command = command;
802 bo.binder_type = ei->binder_type;
805 return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
808 static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
809 struct tcf_block_ext_info *ei,
810 struct netlink_ext_ack *extack)
812 struct net_device *dev = q->dev_queue->dev;
815 if (!dev->netdev_ops->ndo_setup_tc)
816 goto no_offload_dev_inc;
818 /* If tc offload feature is disabled and the block we try to bind
819 * to already has some offloaded filters, forbid to bind.
821 if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) {
822 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
826 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_BIND, extack);
827 if (err == -EOPNOTSUPP)
828 goto no_offload_dev_inc;
832 tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack);
836 if (tcf_block_offload_in_use(block))
838 block->nooffloaddevcnt++;
839 tc_indr_block_call(block, dev, ei, TC_BLOCK_BIND, extack);
843 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
844 struct tcf_block_ext_info *ei)
846 struct net_device *dev = q->dev_queue->dev;
849 tc_indr_block_call(block, dev, ei, TC_BLOCK_UNBIND, NULL);
851 if (!dev->netdev_ops->ndo_setup_tc)
852 goto no_offload_dev_dec;
853 err = tcf_block_offload_cmd(block, dev, ei, TC_BLOCK_UNBIND, NULL);
854 if (err == -EOPNOTSUPP)
855 goto no_offload_dev_dec;
859 WARN_ON(block->nooffloaddevcnt-- == 0);
863 tcf_chain0_head_change_cb_add(struct tcf_block *block,
864 struct tcf_block_ext_info *ei,
865 struct netlink_ext_ack *extack)
867 struct tcf_filter_chain_list_item *item;
868 struct tcf_chain *chain0;
870 item = kmalloc(sizeof(*item), GFP_KERNEL);
872 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
875 item->chain_head_change = ei->chain_head_change;
876 item->chain_head_change_priv = ei->chain_head_change_priv;
878 mutex_lock(&block->lock);
879 chain0 = block->chain0.chain;
881 tcf_chain_hold(chain0);
883 list_add(&item->list, &block->chain0.filter_chain_list);
884 mutex_unlock(&block->lock);
887 struct tcf_proto *tp_head;
889 mutex_lock(&chain0->filter_chain_lock);
891 tp_head = tcf_chain_dereference(chain0->filter_chain, chain0);
893 tcf_chain_head_change_item(item, tp_head);
895 mutex_lock(&block->lock);
896 list_add(&item->list, &block->chain0.filter_chain_list);
897 mutex_unlock(&block->lock);
899 mutex_unlock(&chain0->filter_chain_lock);
900 tcf_chain_put(chain0);
907 tcf_chain0_head_change_cb_del(struct tcf_block *block,
908 struct tcf_block_ext_info *ei)
910 struct tcf_filter_chain_list_item *item;
912 mutex_lock(&block->lock);
913 list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
914 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
915 (item->chain_head_change == ei->chain_head_change &&
916 item->chain_head_change_priv == ei->chain_head_change_priv)) {
917 if (block->chain0.chain)
918 tcf_chain_head_change_item(item, NULL);
919 list_del(&item->list);
920 mutex_unlock(&block->lock);
926 mutex_unlock(&block->lock);
931 spinlock_t idr_lock; /* Protects idr */
935 static unsigned int tcf_net_id;
937 static int tcf_block_insert(struct tcf_block *block, struct net *net,
938 struct netlink_ext_ack *extack)
940 struct tcf_net *tn = net_generic(net, tcf_net_id);
943 idr_preload(GFP_KERNEL);
944 spin_lock(&tn->idr_lock);
945 err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
947 spin_unlock(&tn->idr_lock);
953 static void tcf_block_remove(struct tcf_block *block, struct net *net)
955 struct tcf_net *tn = net_generic(net, tcf_net_id);
957 spin_lock(&tn->idr_lock);
958 idr_remove(&tn->idr, block->index);
959 spin_unlock(&tn->idr_lock);
962 static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
964 struct netlink_ext_ack *extack)
966 struct tcf_block *block;
968 block = kzalloc(sizeof(*block), GFP_KERNEL);
970 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
971 return ERR_PTR(-ENOMEM);
973 mutex_init(&block->lock);
974 INIT_LIST_HEAD(&block->chain_list);
975 INIT_LIST_HEAD(&block->cb_list);
976 INIT_LIST_HEAD(&block->owner_list);
977 INIT_LIST_HEAD(&block->chain0.filter_chain_list);
979 refcount_set(&block->refcnt, 1);
981 block->index = block_index;
983 /* Don't store q pointer for blocks which are shared */
984 if (!tcf_block_shared(block))
989 static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
991 struct tcf_net *tn = net_generic(net, tcf_net_id);
993 return idr_find(&tn->idr, block_index);
996 static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
998 struct tcf_block *block;
1001 block = tcf_block_lookup(net, block_index);
1002 if (block && !refcount_inc_not_zero(&block->refcnt))
1009 static struct tcf_chain *
1010 __tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1012 mutex_lock(&block->lock);
1014 chain = list_is_last(&chain->list, &block->chain_list) ?
1015 NULL : list_next_entry(chain, list);
1017 chain = list_first_entry_or_null(&block->chain_list,
1018 struct tcf_chain, list);
1020 /* skip all action-only chains */
1021 while (chain && tcf_chain_held_by_acts_only(chain))
1022 chain = list_is_last(&chain->list, &block->chain_list) ?
1023 NULL : list_next_entry(chain, list);
1026 tcf_chain_hold(chain);
1027 mutex_unlock(&block->lock);
1032 /* Function to be used by all clients that want to iterate over all chains on
1033 * block. It properly obtains block->lock and takes reference to chain before
1034 * returning it. Users of this function must be tolerant to concurrent chain
1035 * insertion/deletion or ensure that no concurrent chain modification is
1036 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1037 * consistent dump because rtnl lock is released each time skb is filled with
1038 * data and sent to user-space.
1042 tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1044 struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain);
1047 tcf_chain_put(chain);
1051 EXPORT_SYMBOL(tcf_get_next_chain);
1053 static struct tcf_proto *
1054 __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
1059 mutex_lock(&chain->filter_chain_lock);
1062 tp = tcf_chain_dereference(chain->filter_chain, chain);
1063 } else if (tcf_proto_is_deleting(tp)) {
1064 /* 'deleting' flag is set and chain->filter_chain_lock was
1065 * unlocked, which means next pointer could be invalid. Restart
1068 prio = tp->prio + 1;
1069 tp = tcf_chain_dereference(chain->filter_chain, chain);
1071 for (; tp; tp = tcf_chain_dereference(tp->next, chain))
1072 if (!tp->deleting && tp->prio >= prio)
1075 tp = tcf_chain_dereference(tp->next, chain);
1081 mutex_unlock(&chain->filter_chain_lock);
1086 /* Function to be used by all clients that want to iterate over all tp's on
1087 * chain. Users of this function must be tolerant to concurrent tp
1088 * insertion/deletion or ensure that no concurrent chain modification is
1089 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1090 * consistent dump because rtnl lock is released each time skb is filled with
1091 * data and sent to user-space.
1095 tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp,
1098 struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
1101 tcf_proto_put(tp, rtnl_held, NULL);
1105 EXPORT_SYMBOL(tcf_get_next_proto);
1107 static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held)
1109 struct tcf_chain *chain;
1111 /* Last reference to block. At this point chains cannot be added or
1112 * removed concurrently.
1114 for (chain = tcf_get_next_chain(block, NULL);
1116 chain = tcf_get_next_chain(block, chain)) {
1117 tcf_chain_put_explicitly_created(chain);
1118 tcf_chain_flush(chain, rtnl_held);
1122 /* Lookup Qdisc and increments its reference counter.
1123 * Set parent, if necessary.
1126 static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
1127 u32 *parent, int ifindex, bool rtnl_held,
1128 struct netlink_ext_ack *extack)
1130 const struct Qdisc_class_ops *cops;
1131 struct net_device *dev;
1134 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1140 dev = dev_get_by_index_rcu(net, ifindex);
1149 *parent = (*q)->handle;
1151 *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
1153 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1159 *q = qdisc_refcount_inc_nz(*q);
1161 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1166 /* Is it classful? */
1167 cops = (*q)->ops->cl_ops;
1169 NL_SET_ERR_MSG(extack, "Qdisc not classful");
1174 if (!cops->tcf_block) {
1175 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
1181 /* At this point we know that qdisc is not noop_qdisc,
1182 * which means that qdisc holds a reference to net_device
1183 * and we hold a reference to qdisc, so it is safe to release
1195 qdisc_put_unlocked(*q);
1201 static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl,
1202 int ifindex, struct netlink_ext_ack *extack)
1204 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1207 /* Do we search for filter, attached to class? */
1208 if (TC_H_MIN(parent)) {
1209 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1211 *cl = cops->find(q, parent);
1213 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
1221 static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q,
1222 unsigned long cl, int ifindex,
1224 struct netlink_ext_ack *extack)
1226 struct tcf_block *block;
1228 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1229 block = tcf_block_refcnt_get(net, block_index);
1231 NL_SET_ERR_MSG(extack, "Block of given index was not found");
1232 return ERR_PTR(-EINVAL);
1235 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1237 block = cops->tcf_block(q, cl, extack);
1239 return ERR_PTR(-EINVAL);
1241 if (tcf_block_shared(block)) {
1242 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
1243 return ERR_PTR(-EOPNOTSUPP);
1246 /* Always take reference to block in order to support execution
1247 * of rules update path of cls API without rtnl lock. Caller
1248 * must release block when it is finished using it. 'if' block
1249 * of this conditional obtain reference to block by calling
1250 * tcf_block_refcnt_get().
1252 refcount_inc(&block->refcnt);
1258 static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q,
1259 struct tcf_block_ext_info *ei, bool rtnl_held)
1261 if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) {
1262 /* Flushing/putting all chains will cause the block to be
1263 * deallocated when last chain is freed. However, if chain_list
1264 * is empty, block has to be manually deallocated. After block
1265 * reference counter reached 0, it is no longer possible to
1266 * increment it or add new chains to block.
1268 bool free_block = list_empty(&block->chain_list);
1270 mutex_unlock(&block->lock);
1271 if (tcf_block_shared(block))
1272 tcf_block_remove(block, block->net);
1275 tcf_block_offload_unbind(block, q, ei);
1278 tcf_block_destroy(block);
1280 tcf_block_flush_all_chains(block, rtnl_held);
1282 tcf_block_offload_unbind(block, q, ei);
1286 static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held)
1288 __tcf_block_put(block, NULL, NULL, rtnl_held);
1292 * Set q, parent, cl when appropriate.
1295 static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
1296 u32 *parent, unsigned long *cl,
1297 int ifindex, u32 block_index,
1298 struct netlink_ext_ack *extack)
1300 struct tcf_block *block;
1305 err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack);
1309 err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack);
1313 block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack);
1314 if (IS_ERR(block)) {
1315 err = PTR_ERR(block);
1326 return ERR_PTR(err);
1329 static void tcf_block_release(struct Qdisc *q, struct tcf_block *block,
1332 if (!IS_ERR_OR_NULL(block))
1333 tcf_block_refcnt_put(block, rtnl_held);
1339 qdisc_put_unlocked(q);
1343 struct tcf_block_owner_item {
1344 struct list_head list;
1346 enum tcf_block_binder_type binder_type;
1350 tcf_block_owner_netif_keep_dst(struct tcf_block *block,
1352 enum tcf_block_binder_type binder_type)
1354 if (block->keep_dst &&
1355 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1356 binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1357 netif_keep_dst(qdisc_dev(q));
1360 void tcf_block_netif_keep_dst(struct tcf_block *block)
1362 struct tcf_block_owner_item *item;
1364 block->keep_dst = true;
1365 list_for_each_entry(item, &block->owner_list, list)
1366 tcf_block_owner_netif_keep_dst(block, item->q,
1369 EXPORT_SYMBOL(tcf_block_netif_keep_dst);
1371 static int tcf_block_owner_add(struct tcf_block *block,
1373 enum tcf_block_binder_type binder_type)
1375 struct tcf_block_owner_item *item;
1377 item = kmalloc(sizeof(*item), GFP_KERNEL);
1381 item->binder_type = binder_type;
1382 list_add(&item->list, &block->owner_list);
1386 static void tcf_block_owner_del(struct tcf_block *block,
1388 enum tcf_block_binder_type binder_type)
1390 struct tcf_block_owner_item *item;
1392 list_for_each_entry(item, &block->owner_list, list) {
1393 if (item->q == q && item->binder_type == binder_type) {
1394 list_del(&item->list);
1402 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
1403 struct tcf_block_ext_info *ei,
1404 struct netlink_ext_ack *extack)
1406 struct net *net = qdisc_net(q);
1407 struct tcf_block *block = NULL;
1410 if (ei->block_index)
1411 /* block_index not 0 means the shared block is requested */
1412 block = tcf_block_refcnt_get(net, ei->block_index);
1415 block = tcf_block_create(net, q, ei->block_index, extack);
1417 return PTR_ERR(block);
1418 if (tcf_block_shared(block)) {
1419 err = tcf_block_insert(block, net, extack);
1421 goto err_block_insert;
1425 err = tcf_block_owner_add(block, q, ei->binder_type);
1427 goto err_block_owner_add;
1429 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
1431 err = tcf_chain0_head_change_cb_add(block, ei, extack);
1433 goto err_chain0_head_change_cb_add;
1435 err = tcf_block_offload_bind(block, q, ei, extack);
1437 goto err_block_offload_bind;
1442 err_block_offload_bind:
1443 tcf_chain0_head_change_cb_del(block, ei);
1444 err_chain0_head_change_cb_add:
1445 tcf_block_owner_del(block, q, ei->binder_type);
1446 err_block_owner_add:
1448 tcf_block_refcnt_put(block, true);
1451 EXPORT_SYMBOL(tcf_block_get_ext);
1453 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
1455 struct tcf_proto __rcu **p_filter_chain = priv;
1457 rcu_assign_pointer(*p_filter_chain, tp_head);
1460 int tcf_block_get(struct tcf_block **p_block,
1461 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
1462 struct netlink_ext_ack *extack)
1464 struct tcf_block_ext_info ei = {
1465 .chain_head_change = tcf_chain_head_change_dflt,
1466 .chain_head_change_priv = p_filter_chain,
1469 WARN_ON(!p_filter_chain);
1470 return tcf_block_get_ext(p_block, q, &ei, extack);
1472 EXPORT_SYMBOL(tcf_block_get);
1474 /* XXX: Standalone actions are not allowed to jump to any chain, and bound
1475 * actions should be all removed after flushing.
1477 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
1478 struct tcf_block_ext_info *ei)
1482 tcf_chain0_head_change_cb_del(block, ei);
1483 tcf_block_owner_del(block, q, ei->binder_type);
1485 __tcf_block_put(block, q, ei, true);
1487 EXPORT_SYMBOL(tcf_block_put_ext);
1489 void tcf_block_put(struct tcf_block *block)
1491 struct tcf_block_ext_info ei = {0, };
1495 tcf_block_put_ext(block, block->q, &ei);
1498 EXPORT_SYMBOL(tcf_block_put);
1500 struct tcf_block_cb {
1501 struct list_head list;
1505 unsigned int refcnt;
1508 void *tcf_block_cb_priv(struct tcf_block_cb *block_cb)
1510 return block_cb->cb_priv;
1512 EXPORT_SYMBOL(tcf_block_cb_priv);
1514 struct tcf_block_cb *tcf_block_cb_lookup(struct tcf_block *block,
1515 tc_setup_cb_t *cb, void *cb_ident)
1516 { struct tcf_block_cb *block_cb;
1518 list_for_each_entry(block_cb, &block->cb_list, list)
1519 if (block_cb->cb == cb && block_cb->cb_ident == cb_ident)
1523 EXPORT_SYMBOL(tcf_block_cb_lookup);
1525 void tcf_block_cb_incref(struct tcf_block_cb *block_cb)
1529 EXPORT_SYMBOL(tcf_block_cb_incref);
1531 unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
1533 return --block_cb->refcnt;
1535 EXPORT_SYMBOL(tcf_block_cb_decref);
1538 tcf_block_playback_offloads(struct tcf_block *block, tc_setup_cb_t *cb,
1539 void *cb_priv, bool add, bool offload_in_use,
1540 struct netlink_ext_ack *extack)
1542 struct tcf_chain *chain, *chain_prev;
1543 struct tcf_proto *tp, *tp_prev;
1546 for (chain = __tcf_get_next_chain(block, NULL);
1549 chain = __tcf_get_next_chain(block, chain),
1550 tcf_chain_put(chain_prev)) {
1551 for (tp = __tcf_get_next_proto(chain, NULL); tp;
1553 tp = __tcf_get_next_proto(chain, tp),
1554 tcf_proto_put(tp_prev, true, NULL)) {
1555 if (tp->ops->reoffload) {
1556 err = tp->ops->reoffload(tp, add, cb, cb_priv,
1559 goto err_playback_remove;
1560 } else if (add && offload_in_use) {
1562 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
1563 goto err_playback_remove;
1570 err_playback_remove:
1571 tcf_proto_put(tp, true, NULL);
1572 tcf_chain_put(chain);
1573 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
1578 struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
1579 tc_setup_cb_t *cb, void *cb_ident,
1581 struct netlink_ext_ack *extack)
1583 struct tcf_block_cb *block_cb;
1586 /* Replay any already present rules */
1587 err = tcf_block_playback_offloads(block, cb, cb_priv, true,
1588 tcf_block_offload_in_use(block),
1591 return ERR_PTR(err);
1593 block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
1595 return ERR_PTR(-ENOMEM);
1597 block_cb->cb_ident = cb_ident;
1598 block_cb->cb_priv = cb_priv;
1599 list_add(&block_cb->list, &block->cb_list);
1602 EXPORT_SYMBOL(__tcf_block_cb_register);
1604 int tcf_block_cb_register(struct tcf_block *block,
1605 tc_setup_cb_t *cb, void *cb_ident,
1606 void *cb_priv, struct netlink_ext_ack *extack)
1608 struct tcf_block_cb *block_cb;
1610 block_cb = __tcf_block_cb_register(block, cb, cb_ident, cb_priv,
1612 return PTR_ERR_OR_ZERO(block_cb);
1614 EXPORT_SYMBOL(tcf_block_cb_register);
1616 void __tcf_block_cb_unregister(struct tcf_block *block,
1617 struct tcf_block_cb *block_cb)
1619 tcf_block_playback_offloads(block, block_cb->cb, block_cb->cb_priv,
1620 false, tcf_block_offload_in_use(block),
1622 list_del(&block_cb->list);
1625 EXPORT_SYMBOL(__tcf_block_cb_unregister);
1627 void tcf_block_cb_unregister(struct tcf_block *block,
1628 tc_setup_cb_t *cb, void *cb_ident)
1630 struct tcf_block_cb *block_cb;
1632 block_cb = tcf_block_cb_lookup(block, cb, cb_ident);
1635 __tcf_block_cb_unregister(block, block_cb);
1637 EXPORT_SYMBOL(tcf_block_cb_unregister);
1639 /* Main classifier routine: scans classifier chain attached
1640 * to this qdisc, (optionally) tests for protocol and asks
1641 * specific classifiers.
1643 int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
1644 struct tcf_result *res, bool compat_mode)
1646 #ifdef CONFIG_NET_CLS_ACT
1647 const int max_reclassify_loop = 4;
1648 const struct tcf_proto *orig_tp = tp;
1649 const struct tcf_proto *first_tp;
1654 for (; tp; tp = rcu_dereference_bh(tp->next)) {
1655 __be16 protocol = tc_skb_protocol(skb);
1658 if (tp->protocol != protocol &&
1659 tp->protocol != htons(ETH_P_ALL))
1662 err = tp->classify(skb, tp, res);
1663 #ifdef CONFIG_NET_CLS_ACT
1664 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
1667 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
1668 first_tp = res->goto_tp;
1676 return TC_ACT_UNSPEC; /* signal: continue lookup */
1677 #ifdef CONFIG_NET_CLS_ACT
1679 if (unlikely(limit++ >= max_reclassify_loop)) {
1680 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
1681 tp->chain->block->index,
1683 ntohs(tp->protocol));
1691 EXPORT_SYMBOL(tcf_classify);
1693 struct tcf_chain_info {
1694 struct tcf_proto __rcu **pprev;
1695 struct tcf_proto __rcu *next;
1698 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain,
1699 struct tcf_chain_info *chain_info)
1701 return tcf_chain_dereference(*chain_info->pprev, chain);
1704 static int tcf_chain_tp_insert(struct tcf_chain *chain,
1705 struct tcf_chain_info *chain_info,
1706 struct tcf_proto *tp)
1708 if (chain->flushing)
1711 if (*chain_info->pprev == chain->filter_chain)
1712 tcf_chain0_head_change(chain, tp);
1714 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
1715 rcu_assign_pointer(*chain_info->pprev, tp);
1720 static void tcf_chain_tp_remove(struct tcf_chain *chain,
1721 struct tcf_chain_info *chain_info,
1722 struct tcf_proto *tp)
1724 struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain);
1726 tcf_proto_mark_delete(tp);
1727 if (tp == chain->filter_chain)
1728 tcf_chain0_head_change(chain, next);
1729 RCU_INIT_POINTER(*chain_info->pprev, next);
1732 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1733 struct tcf_chain_info *chain_info,
1734 u32 protocol, u32 prio,
1735 bool prio_allocate);
1737 /* Try to insert new proto.
1738 * If proto with specified priority already exists, free new proto
1739 * and return existing one.
1742 static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain,
1743 struct tcf_proto *tp_new,
1744 u32 protocol, u32 prio,
1747 struct tcf_chain_info chain_info;
1748 struct tcf_proto *tp;
1751 mutex_lock(&chain->filter_chain_lock);
1753 tp = tcf_chain_tp_find(chain, &chain_info,
1754 protocol, prio, false);
1756 err = tcf_chain_tp_insert(chain, &chain_info, tp_new);
1757 mutex_unlock(&chain->filter_chain_lock);
1760 tcf_proto_destroy(tp_new, rtnl_held, NULL);
1763 tcf_proto_destroy(tp_new, rtnl_held, NULL);
1764 tp_new = ERR_PTR(err);
1770 static void tcf_chain_tp_delete_empty(struct tcf_chain *chain,
1771 struct tcf_proto *tp, bool rtnl_held,
1772 struct netlink_ext_ack *extack)
1774 struct tcf_chain_info chain_info;
1775 struct tcf_proto *tp_iter;
1776 struct tcf_proto **pprev;
1777 struct tcf_proto *next;
1779 mutex_lock(&chain->filter_chain_lock);
1781 /* Atomically find and remove tp from chain. */
1782 for (pprev = &chain->filter_chain;
1783 (tp_iter = tcf_chain_dereference(*pprev, chain));
1784 pprev = &tp_iter->next) {
1785 if (tp_iter == tp) {
1786 chain_info.pprev = pprev;
1787 chain_info.next = tp_iter->next;
1788 WARN_ON(tp_iter->deleting);
1792 /* Verify that tp still exists and no new filters were inserted
1794 * Mark tp for deletion if it is empty.
1796 if (!tp_iter || !tcf_proto_check_delete(tp, rtnl_held)) {
1797 mutex_unlock(&chain->filter_chain_lock);
1801 next = tcf_chain_dereference(chain_info.next, chain);
1802 if (tp == chain->filter_chain)
1803 tcf_chain0_head_change(chain, next);
1804 RCU_INIT_POINTER(*chain_info.pprev, next);
1805 mutex_unlock(&chain->filter_chain_lock);
1807 tcf_proto_put(tp, rtnl_held, extack);
1810 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1811 struct tcf_chain_info *chain_info,
1812 u32 protocol, u32 prio,
1815 struct tcf_proto **pprev;
1816 struct tcf_proto *tp;
1818 /* Check the chain for existence of proto-tcf with this priority */
1819 for (pprev = &chain->filter_chain;
1820 (tp = tcf_chain_dereference(*pprev, chain));
1821 pprev = &tp->next) {
1822 if (tp->prio >= prio) {
1823 if (tp->prio == prio) {
1824 if (prio_allocate ||
1825 (tp->protocol != protocol && protocol))
1826 return ERR_PTR(-EINVAL);
1833 chain_info->pprev = pprev;
1835 chain_info->next = tp->next;
1838 chain_info->next = NULL;
1843 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
1844 struct tcf_proto *tp, struct tcf_block *block,
1845 struct Qdisc *q, u32 parent, void *fh,
1846 u32 portid, u32 seq, u16 flags, int event,
1850 struct nlmsghdr *nlh;
1851 unsigned char *b = skb_tail_pointer(skb);
1853 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1855 goto out_nlmsg_trim;
1856 tcm = nlmsg_data(nlh);
1857 tcm->tcm_family = AF_UNSPEC;
1861 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1862 tcm->tcm_parent = parent;
1864 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1865 tcm->tcm_block_index = block->index;
1867 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
1868 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
1869 goto nla_put_failure;
1870 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
1871 goto nla_put_failure;
1873 tcm->tcm_handle = 0;
1875 if (tp->ops->dump &&
1876 tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0)
1877 goto nla_put_failure;
1879 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1888 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
1889 struct nlmsghdr *n, struct tcf_proto *tp,
1890 struct tcf_block *block, struct Qdisc *q,
1891 u32 parent, void *fh, int event, bool unicast,
1894 struct sk_buff *skb;
1895 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1898 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1902 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1903 n->nlmsg_seq, n->nlmsg_flags, event,
1910 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1912 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1913 n->nlmsg_flags & NLM_F_ECHO);
1920 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
1921 struct nlmsghdr *n, struct tcf_proto *tp,
1922 struct tcf_block *block, struct Qdisc *q,
1923 u32 parent, void *fh, bool unicast, bool *last,
1924 bool rtnl_held, struct netlink_ext_ack *extack)
1926 struct sk_buff *skb;
1927 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
1930 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1934 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
1935 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER,
1937 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
1942 err = tp->ops->delete(tp, fh, last, rtnl_held, extack);
1949 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
1951 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1952 n->nlmsg_flags & NLM_F_ECHO);
1954 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
1961 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
1962 struct tcf_block *block, struct Qdisc *q,
1963 u32 parent, struct nlmsghdr *n,
1964 struct tcf_chain *chain, int event,
1967 struct tcf_proto *tp;
1969 for (tp = tcf_get_next_proto(chain, NULL, rtnl_held);
1970 tp; tp = tcf_get_next_proto(chain, tp, rtnl_held))
1971 tfilter_notify(net, oskb, n, tp, block,
1972 q, parent, NULL, event, false, rtnl_held);
1975 static void tfilter_put(struct tcf_proto *tp, void *fh)
1977 if (tp->ops->put && fh)
1978 tp->ops->put(tp, fh);
1981 static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
1982 struct netlink_ext_ack *extack)
1984 struct net *net = sock_net(skb->sk);
1985 struct nlattr *tca[TCA_MAX + 1];
1992 struct Qdisc *q = NULL;
1993 struct tcf_chain_info chain_info;
1994 struct tcf_chain *chain = NULL;
1995 struct tcf_block *block;
1996 struct tcf_proto *tp;
2001 bool rtnl_held = false;
2003 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2009 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
2014 protocol = TC_H_MIN(t->tcm_info);
2015 prio = TC_H_MAJ(t->tcm_info);
2016 prio_allocate = false;
2017 parent = t->tcm_parent;
2023 /* If no priority is provided by the user,
2026 if (n->nlmsg_flags & NLM_F_CREATE) {
2027 prio = TC_H_MAKE(0x80000000U, 0U);
2028 prio_allocate = true;
2030 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2035 /* Find head of filter chain. */
2037 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2041 /* Take rtnl mutex if rtnl_held was set to true on previous iteration,
2042 * block is shared (no qdisc found), qdisc is not unlocked, classifier
2043 * type is not specified, classifier is not unlocked.
2046 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2047 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2052 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2056 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2058 if (IS_ERR(block)) {
2059 err = PTR_ERR(block);
2063 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2064 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2065 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2069 chain = tcf_chain_get(block, chain_index, true);
2071 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
2076 mutex_lock(&chain->filter_chain_lock);
2077 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2078 prio, prio_allocate);
2080 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2086 struct tcf_proto *tp_new = NULL;
2088 if (chain->flushing) {
2093 /* Proto-tcf does not exist, create new one */
2095 if (tca[TCA_KIND] == NULL || !protocol) {
2096 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
2101 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2102 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2108 prio = tcf_auto_prio(tcf_chain_tp_prev(chain,
2111 mutex_unlock(&chain->filter_chain_lock);
2112 tp_new = tcf_proto_create(nla_data(tca[TCA_KIND]),
2113 protocol, prio, chain, rtnl_held,
2115 if (IS_ERR(tp_new)) {
2116 err = PTR_ERR(tp_new);
2121 tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio,
2128 mutex_unlock(&chain->filter_chain_lock);
2131 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2132 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2137 fh = tp->ops->get(tp, t->tcm_handle);
2140 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2141 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2145 } else if (n->nlmsg_flags & NLM_F_EXCL) {
2146 tfilter_put(tp, fh);
2147 NL_SET_ERR_MSG(extack, "Filter already exists");
2152 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
2153 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
2158 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
2159 n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
2162 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2163 RTM_NEWTFILTER, false, rtnl_held);
2164 tfilter_put(tp, fh);
2168 if (err && tp_created)
2169 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL);
2172 if (tp && !IS_ERR(tp))
2173 tcf_proto_put(tp, rtnl_held, NULL);
2175 tcf_chain_put(chain);
2177 tcf_block_release(q, block, rtnl_held);
2182 if (err == -EAGAIN) {
2183 /* Take rtnl lock in case EAGAIN is caused by concurrent flush
2187 /* Replay the request. */
2193 mutex_unlock(&chain->filter_chain_lock);
2197 static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2198 struct netlink_ext_ack *extack)
2200 struct net *net = sock_net(skb->sk);
2201 struct nlattr *tca[TCA_MAX + 1];
2207 struct Qdisc *q = NULL;
2208 struct tcf_chain_info chain_info;
2209 struct tcf_chain *chain = NULL;
2210 struct tcf_block *block = NULL;
2211 struct tcf_proto *tp = NULL;
2212 unsigned long cl = 0;
2215 bool rtnl_held = false;
2217 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2220 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
2225 protocol = TC_H_MIN(t->tcm_info);
2226 prio = TC_H_MAJ(t->tcm_info);
2227 parent = t->tcm_parent;
2229 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
2230 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
2234 /* Find head of filter chain. */
2236 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2240 /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc
2241 * found), qdisc is not unlocked, classifier type is not specified,
2242 * classifier is not unlocked.
2245 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2246 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2251 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2255 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2257 if (IS_ERR(block)) {
2258 err = PTR_ERR(block);
2262 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2263 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2264 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2268 chain = tcf_chain_get(block, chain_index, false);
2270 /* User requested flush on non-existent chain. Nothing to do,
2271 * so just return success.
2277 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2283 tfilter_notify_chain(net, skb, block, q, parent, n,
2284 chain, RTM_DELTFILTER, rtnl_held);
2285 tcf_chain_flush(chain, rtnl_held);
2290 mutex_lock(&chain->filter_chain_lock);
2291 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2293 if (!tp || IS_ERR(tp)) {
2294 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2295 err = tp ? PTR_ERR(tp) : -ENOENT;
2297 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2298 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2301 } else if (t->tcm_handle == 0) {
2302 tcf_chain_tp_remove(chain, &chain_info, tp);
2303 mutex_unlock(&chain->filter_chain_lock);
2305 tcf_proto_put(tp, rtnl_held, NULL);
2306 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2307 RTM_DELTFILTER, false, rtnl_held);
2311 mutex_unlock(&chain->filter_chain_lock);
2313 fh = tp->ops->get(tp, t->tcm_handle);
2316 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2321 err = tfilter_del_notify(net, skb, n, tp, block,
2322 q, parent, fh, false, &last,
2328 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack);
2333 if (tp && !IS_ERR(tp))
2334 tcf_proto_put(tp, rtnl_held, NULL);
2335 tcf_chain_put(chain);
2337 tcf_block_release(q, block, rtnl_held);
2345 mutex_unlock(&chain->filter_chain_lock);
2349 static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2350 struct netlink_ext_ack *extack)
2352 struct net *net = sock_net(skb->sk);
2353 struct nlattr *tca[TCA_MAX + 1];
2359 struct Qdisc *q = NULL;
2360 struct tcf_chain_info chain_info;
2361 struct tcf_chain *chain = NULL;
2362 struct tcf_block *block = NULL;
2363 struct tcf_proto *tp = NULL;
2364 unsigned long cl = 0;
2367 bool rtnl_held = false;
2369 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
2374 protocol = TC_H_MIN(t->tcm_info);
2375 prio = TC_H_MAJ(t->tcm_info);
2376 parent = t->tcm_parent;
2379 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2383 /* Find head of filter chain. */
2385 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2389 /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not
2390 * unlocked, classifier type is not specified, classifier is not
2393 if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2394 !tca[TCA_KIND] || !tcf_proto_is_unlocked(nla_data(tca[TCA_KIND]))) {
2399 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2403 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2405 if (IS_ERR(block)) {
2406 err = PTR_ERR(block);
2410 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2411 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2412 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2416 chain = tcf_chain_get(block, chain_index, false);
2418 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2423 mutex_lock(&chain->filter_chain_lock);
2424 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2426 mutex_unlock(&chain->filter_chain_lock);
2427 if (!tp || IS_ERR(tp)) {
2428 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2429 err = tp ? PTR_ERR(tp) : -ENOENT;
2431 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2432 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2437 fh = tp->ops->get(tp, t->tcm_handle);
2440 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2443 err = tfilter_notify(net, skb, n, tp, block, q, parent,
2444 fh, RTM_NEWTFILTER, true, rtnl_held);
2446 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
2449 tfilter_put(tp, fh);
2452 if (tp && !IS_ERR(tp))
2453 tcf_proto_put(tp, rtnl_held, NULL);
2454 tcf_chain_put(chain);
2456 tcf_block_release(q, block, rtnl_held);
2464 struct tcf_dump_args {
2465 struct tcf_walker w;
2466 struct sk_buff *skb;
2467 struct netlink_callback *cb;
2468 struct tcf_block *block;
2473 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
2475 struct tcf_dump_args *a = (void *)arg;
2476 struct net *net = sock_net(a->skb->sk);
2478 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
2479 n, NETLINK_CB(a->cb->skb).portid,
2480 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2481 RTM_NEWTFILTER, true);
2484 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
2485 struct sk_buff *skb, struct netlink_callback *cb,
2486 long index_start, long *p_index)
2488 struct net *net = sock_net(skb->sk);
2489 struct tcf_block *block = chain->block;
2490 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2491 struct tcf_proto *tp, *tp_prev;
2492 struct tcf_dump_args arg;
2494 for (tp = __tcf_get_next_proto(chain, NULL);
2497 tp = __tcf_get_next_proto(chain, tp),
2498 tcf_proto_put(tp_prev, true, NULL),
2500 if (*p_index < index_start)
2502 if (TC_H_MAJ(tcm->tcm_info) &&
2503 TC_H_MAJ(tcm->tcm_info) != tp->prio)
2505 if (TC_H_MIN(tcm->tcm_info) &&
2506 TC_H_MIN(tcm->tcm_info) != tp->protocol)
2508 if (*p_index > index_start)
2509 memset(&cb->args[1], 0,
2510 sizeof(cb->args) - sizeof(cb->args[0]));
2511 if (cb->args[1] == 0) {
2512 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
2513 NETLINK_CB(cb->skb).portid,
2514 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2515 RTM_NEWTFILTER, true) <= 0)
2521 arg.w.fn = tcf_node_dump;
2526 arg.parent = parent;
2528 arg.w.skip = cb->args[1] - 1;
2530 arg.w.cookie = cb->args[2];
2531 tp->ops->walk(tp, &arg.w, true);
2532 cb->args[2] = arg.w.cookie;
2533 cb->args[1] = arg.w.count + 1;
2540 tcf_proto_put(tp, true, NULL);
2544 /* called with RTNL */
2545 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
2547 struct tcf_chain *chain, *chain_prev;
2548 struct net *net = sock_net(skb->sk);
2549 struct nlattr *tca[TCA_MAX + 1];
2550 struct Qdisc *q = NULL;
2551 struct tcf_block *block;
2552 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2558 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2561 err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, NULL,
2566 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2567 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2570 /* If we work with block index, q is NULL and parent value
2571 * will never be used in the following code. The check
2572 * in tcf_fill_node prevents it. However, compiler does not
2573 * see that far, so set parent to zero to silence the warning
2574 * about parent being uninitialized.
2578 const struct Qdisc_class_ops *cops;
2579 struct net_device *dev;
2580 unsigned long cl = 0;
2582 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2586 parent = tcm->tcm_parent;
2591 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2595 cops = q->ops->cl_ops;
2598 if (!cops->tcf_block)
2600 if (TC_H_MIN(tcm->tcm_parent)) {
2601 cl = cops->find(q, tcm->tcm_parent);
2605 block = cops->tcf_block(q, cl, NULL);
2608 if (tcf_block_shared(block))
2612 index_start = cb->args[0];
2615 for (chain = __tcf_get_next_chain(block, NULL);
2618 chain = __tcf_get_next_chain(block, chain),
2619 tcf_chain_put(chain_prev)) {
2620 if (tca[TCA_CHAIN] &&
2621 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
2623 if (!tcf_chain_dump(chain, q, parent, skb, cb,
2624 index_start, &index)) {
2625 tcf_chain_put(chain);
2631 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
2632 tcf_block_refcnt_put(block, true);
2633 cb->args[0] = index;
2636 /* If we did no progress, the error (EMSGSIZE) is real */
2637 if (skb->len == 0 && err)
2642 static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops,
2643 void *tmplt_priv, u32 chain_index,
2644 struct net *net, struct sk_buff *skb,
2645 struct tcf_block *block,
2646 u32 portid, u32 seq, u16 flags, int event)
2648 unsigned char *b = skb_tail_pointer(skb);
2649 const struct tcf_proto_ops *ops;
2650 struct nlmsghdr *nlh;
2657 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
2659 goto out_nlmsg_trim;
2660 tcm = nlmsg_data(nlh);
2661 tcm->tcm_family = AF_UNSPEC;
2664 tcm->tcm_handle = 0;
2666 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
2667 tcm->tcm_parent = block->q->handle;
2669 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
2670 tcm->tcm_block_index = block->index;
2673 if (nla_put_u32(skb, TCA_CHAIN, chain_index))
2674 goto nla_put_failure;
2677 if (nla_put_string(skb, TCA_KIND, ops->kind))
2678 goto nla_put_failure;
2679 if (ops->tmplt_dump(skb, net, priv) < 0)
2680 goto nla_put_failure;
2683 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2692 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
2693 u32 seq, u16 flags, int event, bool unicast)
2695 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2696 struct tcf_block *block = chain->block;
2697 struct net *net = block->net;
2698 struct sk_buff *skb;
2701 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2705 if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2706 chain->index, net, skb, block, portid,
2707 seq, flags, event) <= 0) {
2713 err = netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2715 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2716 flags & NLM_F_ECHO);
2723 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
2724 void *tmplt_priv, u32 chain_index,
2725 struct tcf_block *block, struct sk_buff *oskb,
2726 u32 seq, u16 flags, bool unicast)
2728 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2729 struct net *net = block->net;
2730 struct sk_buff *skb;
2732 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2736 if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb,
2737 block, portid, seq, flags, RTM_DELCHAIN) <= 0) {
2743 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
2745 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
2748 static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
2749 struct nlattr **tca,
2750 struct netlink_ext_ack *extack)
2752 const struct tcf_proto_ops *ops;
2755 /* If kind is not set, user did not specify template. */
2759 ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), true, extack);
2761 return PTR_ERR(ops);
2762 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
2763 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
2767 tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
2768 if (IS_ERR(tmplt_priv)) {
2769 module_put(ops->owner);
2770 return PTR_ERR(tmplt_priv);
2772 chain->tmplt_ops = ops;
2773 chain->tmplt_priv = tmplt_priv;
2777 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
2780 /* If template ops are set, no work to do for us. */
2784 tmplt_ops->tmplt_destroy(tmplt_priv);
2785 module_put(tmplt_ops->owner);
2788 /* Add/delete/get a chain */
2790 static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
2791 struct netlink_ext_ack *extack)
2793 struct net *net = sock_net(skb->sk);
2794 struct nlattr *tca[TCA_MAX + 1];
2798 struct Qdisc *q = NULL;
2799 struct tcf_chain *chain = NULL;
2800 struct tcf_block *block;
2804 if (n->nlmsg_type != RTM_GETCHAIN &&
2805 !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
2809 err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, rtm_tca_policy, extack);
2814 parent = t->tcm_parent;
2817 block = tcf_block_find(net, &q, &parent, &cl,
2818 t->tcm_ifindex, t->tcm_block_index, extack);
2820 return PTR_ERR(block);
2822 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2823 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2824 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2829 mutex_lock(&block->lock);
2830 chain = tcf_chain_lookup(block, chain_index);
2831 if (n->nlmsg_type == RTM_NEWCHAIN) {
2833 if (tcf_chain_held_by_acts_only(chain)) {
2834 /* The chain exists only because there is
2835 * some action referencing it.
2837 tcf_chain_hold(chain);
2839 NL_SET_ERR_MSG(extack, "Filter chain already exists");
2841 goto errout_block_locked;
2844 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2845 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
2847 goto errout_block_locked;
2849 chain = tcf_chain_create(block, chain_index);
2851 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
2853 goto errout_block_locked;
2857 if (!chain || tcf_chain_held_by_acts_only(chain)) {
2858 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2860 goto errout_block_locked;
2862 tcf_chain_hold(chain);
2865 if (n->nlmsg_type == RTM_NEWCHAIN) {
2866 /* Modifying chain requires holding parent block lock. In case
2867 * the chain was successfully added, take a reference to the
2868 * chain. This ensures that an empty chain does not disappear at
2869 * the end of this function.
2871 tcf_chain_hold(chain);
2872 chain->explicitly_created = true;
2874 mutex_unlock(&block->lock);
2876 switch (n->nlmsg_type) {
2878 err = tc_chain_tmplt_add(chain, net, tca, extack);
2880 tcf_chain_put_explicitly_created(chain);
2884 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
2885 RTM_NEWCHAIN, false);
2888 tfilter_notify_chain(net, skb, block, q, parent, n,
2889 chain, RTM_DELTFILTER, true);
2890 /* Flush the chain first as the user requested chain removal. */
2891 tcf_chain_flush(chain, true);
2892 /* In case the chain was successfully deleted, put a reference
2893 * to the chain previously taken during addition.
2895 tcf_chain_put_explicitly_created(chain);
2898 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
2899 n->nlmsg_seq, n->nlmsg_type, true);
2901 NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
2905 NL_SET_ERR_MSG(extack, "Unsupported message type");
2910 tcf_chain_put(chain);
2912 tcf_block_release(q, block, true);
2914 /* Replay the request. */
2918 errout_block_locked:
2919 mutex_unlock(&block->lock);
2923 /* called with RTNL */
2924 static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
2926 struct net *net = sock_net(skb->sk);
2927 struct nlattr *tca[TCA_MAX + 1];
2928 struct Qdisc *q = NULL;
2929 struct tcf_block *block;
2930 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2931 struct tcf_chain *chain;
2937 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2940 err = nlmsg_parse(cb->nlh, sizeof(*tcm), tca, TCA_MAX, rtm_tca_policy,
2945 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2946 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2949 /* If we work with block index, q is NULL and parent value
2950 * will never be used in the following code. The check
2951 * in tcf_fill_node prevents it. However, compiler does not
2952 * see that far, so set parent to zero to silence the warning
2953 * about parent being uninitialized.
2957 const struct Qdisc_class_ops *cops;
2958 struct net_device *dev;
2959 unsigned long cl = 0;
2961 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2965 parent = tcm->tcm_parent;
2970 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2974 cops = q->ops->cl_ops;
2977 if (!cops->tcf_block)
2979 if (TC_H_MIN(tcm->tcm_parent)) {
2980 cl = cops->find(q, tcm->tcm_parent);
2984 block = cops->tcf_block(q, cl, NULL);
2987 if (tcf_block_shared(block))
2991 index_start = cb->args[0];
2994 mutex_lock(&block->lock);
2995 list_for_each_entry(chain, &block->chain_list, list) {
2996 if ((tca[TCA_CHAIN] &&
2997 nla_get_u32(tca[TCA_CHAIN]) != chain->index))
2999 if (index < index_start) {
3003 if (tcf_chain_held_by_acts_only(chain))
3005 err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
3006 chain->index, net, skb, block,
3007 NETLINK_CB(cb->skb).portid,
3008 cb->nlh->nlmsg_seq, NLM_F_MULTI,
3014 mutex_unlock(&block->lock);
3016 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
3017 tcf_block_refcnt_put(block, true);
3018 cb->args[0] = index;
3021 /* If we did no progress, the error (EMSGSIZE) is real */
3022 if (skb->len == 0 && err)
3027 void tcf_exts_destroy(struct tcf_exts *exts)
3029 #ifdef CONFIG_NET_CLS_ACT
3030 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
3031 kfree(exts->actions);
3032 exts->nr_actions = 0;
3035 EXPORT_SYMBOL(tcf_exts_destroy);
3037 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3038 struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
3039 bool rtnl_held, struct netlink_ext_ack *extack)
3041 #ifdef CONFIG_NET_CLS_ACT
3043 struct tc_action *act;
3044 size_t attr_size = 0;
3046 if (exts->police && tb[exts->police]) {
3047 act = tcf_action_init_1(net, tp, tb[exts->police],
3048 rate_tlv, "police", ovr,
3049 TCA_ACT_BIND, rtnl_held,
3052 return PTR_ERR(act);
3054 act->type = exts->type = TCA_OLD_COMPAT;
3055 exts->actions[0] = act;
3056 exts->nr_actions = 1;
3057 } else if (exts->action && tb[exts->action]) {
3060 err = tcf_action_init(net, tp, tb[exts->action],
3061 rate_tlv, NULL, ovr, TCA_ACT_BIND,
3062 exts->actions, &attr_size,
3066 exts->nr_actions = err;
3070 if ((exts->action && tb[exts->action]) ||
3071 (exts->police && tb[exts->police])) {
3072 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
3079 EXPORT_SYMBOL(tcf_exts_validate);
3081 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
3083 #ifdef CONFIG_NET_CLS_ACT
3084 struct tcf_exts old = *dst;
3087 tcf_exts_destroy(&old);
3090 EXPORT_SYMBOL(tcf_exts_change);
3092 #ifdef CONFIG_NET_CLS_ACT
3093 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
3095 if (exts->nr_actions == 0)
3098 return exts->actions[0];
3102 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
3104 #ifdef CONFIG_NET_CLS_ACT
3105 struct nlattr *nest;
3107 if (exts->action && tcf_exts_has_actions(exts)) {
3109 * again for backward compatible mode - we want
3110 * to work with both old and new modes of entering
3111 * tc data even if iproute2 was newer - jhs
3113 if (exts->type != TCA_OLD_COMPAT) {
3114 nest = nla_nest_start(skb, exts->action);
3116 goto nla_put_failure;
3118 if (tcf_action_dump(skb, exts->actions, 0, 0) < 0)
3119 goto nla_put_failure;
3120 nla_nest_end(skb, nest);
3121 } else if (exts->police) {
3122 struct tc_action *act = tcf_exts_first_act(exts);
3123 nest = nla_nest_start(skb, exts->police);
3124 if (nest == NULL || !act)
3125 goto nla_put_failure;
3126 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
3127 goto nla_put_failure;
3128 nla_nest_end(skb, nest);
3134 nla_nest_cancel(skb, nest);
3140 EXPORT_SYMBOL(tcf_exts_dump);
3143 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
3145 #ifdef CONFIG_NET_CLS_ACT
3146 struct tc_action *a = tcf_exts_first_act(exts);
3147 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
3152 EXPORT_SYMBOL(tcf_exts_dump_stats);
3154 int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3155 void *type_data, bool err_stop)
3157 struct tcf_block_cb *block_cb;
3161 /* Make sure all netdevs sharing this block are offload-capable. */
3162 if (block->nooffloaddevcnt && err_stop)
3165 list_for_each_entry(block_cb, &block->cb_list, list) {
3166 err = block_cb->cb(type, type_data, block_cb->cb_priv);
3176 EXPORT_SYMBOL(tc_setup_cb_call);
3178 int tc_setup_flow_action(struct flow_action *flow_action,
3179 const struct tcf_exts *exts)
3181 const struct tc_action *act;
3188 tcf_exts_for_each_action(i, act, exts) {
3189 struct flow_action_entry *entry;
3191 entry = &flow_action->entries[j];
3192 if (is_tcf_gact_ok(act)) {
3193 entry->id = FLOW_ACTION_ACCEPT;
3194 } else if (is_tcf_gact_shot(act)) {
3195 entry->id = FLOW_ACTION_DROP;
3196 } else if (is_tcf_gact_trap(act)) {
3197 entry->id = FLOW_ACTION_TRAP;
3198 } else if (is_tcf_gact_goto_chain(act)) {
3199 entry->id = FLOW_ACTION_GOTO;
3200 entry->chain_index = tcf_gact_goto_chain_index(act);
3201 } else if (is_tcf_mirred_egress_redirect(act)) {
3202 entry->id = FLOW_ACTION_REDIRECT;
3203 entry->dev = tcf_mirred_dev(act);
3204 } else if (is_tcf_mirred_egress_mirror(act)) {
3205 entry->id = FLOW_ACTION_MIRRED;
3206 entry->dev = tcf_mirred_dev(act);
3207 } else if (is_tcf_vlan(act)) {
3208 switch (tcf_vlan_action(act)) {
3209 case TCA_VLAN_ACT_PUSH:
3210 entry->id = FLOW_ACTION_VLAN_PUSH;
3211 entry->vlan.vid = tcf_vlan_push_vid(act);
3212 entry->vlan.proto = tcf_vlan_push_proto(act);
3213 entry->vlan.prio = tcf_vlan_push_prio(act);
3215 case TCA_VLAN_ACT_POP:
3216 entry->id = FLOW_ACTION_VLAN_POP;
3218 case TCA_VLAN_ACT_MODIFY:
3219 entry->id = FLOW_ACTION_VLAN_MANGLE;
3220 entry->vlan.vid = tcf_vlan_push_vid(act);
3221 entry->vlan.proto = tcf_vlan_push_proto(act);
3222 entry->vlan.prio = tcf_vlan_push_prio(act);
3227 } else if (is_tcf_tunnel_set(act)) {
3228 entry->id = FLOW_ACTION_TUNNEL_ENCAP;
3229 entry->tunnel = tcf_tunnel_info(act);
3230 } else if (is_tcf_tunnel_release(act)) {
3231 entry->id = FLOW_ACTION_TUNNEL_DECAP;
3232 entry->tunnel = tcf_tunnel_info(act);
3233 } else if (is_tcf_pedit(act)) {
3234 for (k = 0; k < tcf_pedit_nkeys(act); k++) {
3235 switch (tcf_pedit_cmd(act, k)) {
3236 case TCA_PEDIT_KEY_EX_CMD_SET:
3237 entry->id = FLOW_ACTION_MANGLE;
3239 case TCA_PEDIT_KEY_EX_CMD_ADD:
3240 entry->id = FLOW_ACTION_ADD;
3245 entry->mangle.htype = tcf_pedit_htype(act, k);
3246 entry->mangle.mask = tcf_pedit_mask(act, k);
3247 entry->mangle.val = tcf_pedit_val(act, k);
3248 entry->mangle.offset = tcf_pedit_offset(act, k);
3249 entry = &flow_action->entries[++j];
3251 } else if (is_tcf_csum(act)) {
3252 entry->id = FLOW_ACTION_CSUM;
3253 entry->csum_flags = tcf_csum_update_flags(act);
3254 } else if (is_tcf_skbedit_mark(act)) {
3255 entry->id = FLOW_ACTION_MARK;
3256 entry->mark = tcf_skbedit_mark(act);
3261 if (!is_tcf_pedit(act))
3268 EXPORT_SYMBOL(tc_setup_flow_action);
3270 unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
3272 unsigned int num_acts = 0;
3273 struct tc_action *act;
3276 tcf_exts_for_each_action(i, act, exts) {
3277 if (is_tcf_pedit(act))
3278 num_acts += tcf_pedit_nkeys(act);
3284 EXPORT_SYMBOL(tcf_exts_num_actions);
3286 static __net_init int tcf_net_init(struct net *net)
3288 struct tcf_net *tn = net_generic(net, tcf_net_id);
3290 spin_lock_init(&tn->idr_lock);
3295 static void __net_exit tcf_net_exit(struct net *net)
3297 struct tcf_net *tn = net_generic(net, tcf_net_id);
3299 idr_destroy(&tn->idr);
3302 static struct pernet_operations tcf_net_ops = {
3303 .init = tcf_net_init,
3304 .exit = tcf_net_exit,
3306 .size = sizeof(struct tcf_net),
3309 static int __init tc_filter_init(void)
3313 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
3317 err = register_pernet_subsys(&tcf_net_ops);
3319 goto err_register_pernet_subsys;
3321 err = rhashtable_init(&indr_setup_block_ht,
3322 &tc_indr_setup_block_ht_params);
3324 goto err_rhash_setup_block_ht;
3326 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL,
3327 RTNL_FLAG_DOIT_UNLOCKED);
3328 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL,
3329 RTNL_FLAG_DOIT_UNLOCKED);
3330 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
3331 tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED);
3332 rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
3333 rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
3334 rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
3339 err_rhash_setup_block_ht:
3340 unregister_pernet_subsys(&tcf_net_ops);
3341 err_register_pernet_subsys:
3342 destroy_workqueue(tc_filter_wq);
3346 subsys_initcall(tc_filter_init);