1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * net/sched/cls_api.c Packet classifier API.
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/string.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
18 #include <linux/skbuff.h>
19 #include <linux/init.h>
20 #include <linux/kmod.h>
21 #include <linux/slab.h>
22 #include <linux/idr.h>
23 #include <linux/jhash.h>
24 #include <linux/rculist.h>
25 #include <linux/rhashtable.h>
26 #include <net/net_namespace.h>
28 #include <net/netlink.h>
29 #include <net/pkt_sched.h>
30 #include <net/pkt_cls.h>
31 #include <net/tc_act/tc_pedit.h>
32 #include <net/tc_act/tc_mirred.h>
33 #include <net/tc_act/tc_vlan.h>
34 #include <net/tc_act/tc_tunnel_key.h>
35 #include <net/tc_act/tc_csum.h>
36 #include <net/tc_act/tc_gact.h>
37 #include <net/tc_act/tc_police.h>
38 #include <net/tc_act/tc_sample.h>
39 #include <net/tc_act/tc_skbedit.h>
40 #include <net/tc_act/tc_ct.h>
41 #include <net/tc_act/tc_mpls.h>
42 #include <net/tc_act/tc_gate.h>
43 #include <net/flow_offload.h>
44 #include <net/tc_wrapper.h>
46 /* The list of all installed classifier types */
47 static LIST_HEAD(tcf_proto_base);
49 /* Protects list of registered TC modules. It is pure SMP lock. */
50 static DEFINE_RWLOCK(cls_mod_lock);
52 static struct xarray tcf_exts_miss_cookies_xa;
53 struct tcf_exts_miss_cookie_node {
54 const struct tcf_chain *chain;
55 const struct tcf_proto *tp;
56 const struct tcf_exts *exts;
64 /* Each tc action entry cookie will be comprised of 32bit miss_cookie_base +
65 * action index in the exts tc actions array.
67 union tcf_exts_miss_cookie {
75 #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
77 tcf_exts_miss_cookie_base_alloc(struct tcf_exts *exts, struct tcf_proto *tp,
80 struct tcf_exts_miss_cookie_node *n;
84 if (WARN_ON(!handle || !tp->ops->get_exts))
87 n = kzalloc(sizeof(*n), GFP_KERNEL);
91 n->chain_index = tp->chain->index;
93 n->tp_prio = tp->prio;
98 err = xa_alloc_cyclic(&tcf_exts_miss_cookies_xa, &n->miss_cookie_base,
99 n, xa_limit_32b, &next, GFP_KERNEL);
103 exts->miss_cookie_node = n;
111 static void tcf_exts_miss_cookie_base_destroy(struct tcf_exts *exts)
113 struct tcf_exts_miss_cookie_node *n;
115 if (!exts->miss_cookie_node)
118 n = exts->miss_cookie_node;
119 xa_erase(&tcf_exts_miss_cookies_xa, n->miss_cookie_base);
123 static struct tcf_exts_miss_cookie_node *
124 tcf_exts_miss_cookie_lookup(u64 miss_cookie, int *act_index)
126 union tcf_exts_miss_cookie mc = { .miss_cookie = miss_cookie, };
128 *act_index = mc.act_index;
129 return xa_load(&tcf_exts_miss_cookies_xa, mc.miss_cookie_base);
131 #else /* IS_ENABLED(CONFIG_NET_TC_SKB_EXT) */
133 tcf_exts_miss_cookie_base_alloc(struct tcf_exts *exts, struct tcf_proto *tp,
139 static void tcf_exts_miss_cookie_base_destroy(struct tcf_exts *exts)
142 #endif /* IS_ENABLED(CONFIG_NET_TC_SKB_EXT) */
144 static u64 tcf_exts_miss_cookie_get(u32 miss_cookie_base, int act_index)
146 union tcf_exts_miss_cookie mc = { .act_index = act_index, };
148 if (!miss_cookie_base)
151 mc.miss_cookie_base = miss_cookie_base;
152 return mc.miss_cookie;
155 #ifdef CONFIG_NET_CLS_ACT
156 DEFINE_STATIC_KEY_FALSE(tc_skb_ext_tc);
157 EXPORT_SYMBOL(tc_skb_ext_tc);
159 void tc_skb_ext_tc_enable(void)
161 static_branch_inc(&tc_skb_ext_tc);
163 EXPORT_SYMBOL(tc_skb_ext_tc_enable);
165 void tc_skb_ext_tc_disable(void)
167 static_branch_dec(&tc_skb_ext_tc);
169 EXPORT_SYMBOL(tc_skb_ext_tc_disable);
172 static u32 destroy_obj_hashfn(const struct tcf_proto *tp)
174 return jhash_3words(tp->chain->index, tp->prio,
175 (__force __u32)tp->protocol, 0);
178 static void tcf_proto_signal_destroying(struct tcf_chain *chain,
179 struct tcf_proto *tp)
181 struct tcf_block *block = chain->block;
183 mutex_lock(&block->proto_destroy_lock);
184 hash_add_rcu(block->proto_destroy_ht, &tp->destroy_ht_node,
185 destroy_obj_hashfn(tp));
186 mutex_unlock(&block->proto_destroy_lock);
189 static bool tcf_proto_cmp(const struct tcf_proto *tp1,
190 const struct tcf_proto *tp2)
192 return tp1->chain->index == tp2->chain->index &&
193 tp1->prio == tp2->prio &&
194 tp1->protocol == tp2->protocol;
197 static bool tcf_proto_exists_destroying(struct tcf_chain *chain,
198 struct tcf_proto *tp)
200 u32 hash = destroy_obj_hashfn(tp);
201 struct tcf_proto *iter;
205 hash_for_each_possible_rcu(chain->block->proto_destroy_ht, iter,
206 destroy_ht_node, hash) {
207 if (tcf_proto_cmp(tp, iter)) {
218 tcf_proto_signal_destroyed(struct tcf_chain *chain, struct tcf_proto *tp)
220 struct tcf_block *block = chain->block;
222 mutex_lock(&block->proto_destroy_lock);
223 if (hash_hashed(&tp->destroy_ht_node))
224 hash_del_rcu(&tp->destroy_ht_node);
225 mutex_unlock(&block->proto_destroy_lock);
228 /* Find classifier type by string name */
230 static const struct tcf_proto_ops *__tcf_proto_lookup_ops(const char *kind)
232 const struct tcf_proto_ops *t, *res = NULL;
235 read_lock(&cls_mod_lock);
236 list_for_each_entry(t, &tcf_proto_base, head) {
237 if (strcmp(kind, t->kind) == 0) {
238 if (try_module_get(t->owner))
243 read_unlock(&cls_mod_lock);
248 static const struct tcf_proto_ops *
249 tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
250 struct netlink_ext_ack *extack)
252 const struct tcf_proto_ops *ops;
254 ops = __tcf_proto_lookup_ops(kind);
257 #ifdef CONFIG_MODULES
260 request_module("cls_%s", kind);
263 ops = __tcf_proto_lookup_ops(kind);
264 /* We dropped the RTNL semaphore in order to perform
265 * the module load. So, even if we succeeded in loading
266 * the module we have to replay the request. We indicate
267 * this using -EAGAIN.
270 module_put(ops->owner);
271 return ERR_PTR(-EAGAIN);
274 NL_SET_ERR_MSG(extack, "TC classifier not found");
275 return ERR_PTR(-ENOENT);
278 /* Register(unregister) new classifier type */
280 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
282 struct tcf_proto_ops *t;
285 write_lock(&cls_mod_lock);
286 list_for_each_entry(t, &tcf_proto_base, head)
287 if (!strcmp(ops->kind, t->kind))
290 list_add_tail(&ops->head, &tcf_proto_base);
293 write_unlock(&cls_mod_lock);
296 EXPORT_SYMBOL(register_tcf_proto_ops);
298 static struct workqueue_struct *tc_filter_wq;
300 void unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
302 struct tcf_proto_ops *t;
305 /* Wait for outstanding call_rcu()s, if any, from a
306 * tcf_proto_ops's destroy() handler.
309 flush_workqueue(tc_filter_wq);
311 write_lock(&cls_mod_lock);
312 list_for_each_entry(t, &tcf_proto_base, head) {
319 write_unlock(&cls_mod_lock);
321 WARN(rc, "unregister tc filter kind(%s) failed %d\n", ops->kind, rc);
323 EXPORT_SYMBOL(unregister_tcf_proto_ops);
325 bool tcf_queue_work(struct rcu_work *rwork, work_func_t func)
327 INIT_RCU_WORK(rwork, func);
328 return queue_rcu_work(tc_filter_wq, rwork);
330 EXPORT_SYMBOL(tcf_queue_work);
332 /* Select new prio value from the range, managed by kernel. */
334 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
336 u32 first = TC_H_MAKE(0xC0000000U, 0U);
339 first = tp->prio - 1;
341 return TC_H_MAJ(first);
344 static bool tcf_proto_check_kind(struct nlattr *kind, char *name)
347 return nla_strscpy(name, kind, IFNAMSIZ) < 0;
348 memset(name, 0, IFNAMSIZ);
352 static bool tcf_proto_is_unlocked(const char *kind)
354 const struct tcf_proto_ops *ops;
357 if (strlen(kind) == 0)
360 ops = tcf_proto_lookup_ops(kind, false, NULL);
361 /* On error return false to take rtnl lock. Proto lookup/create
362 * functions will perform lookup again and properly handle errors.
367 ret = !!(ops->flags & TCF_PROTO_OPS_DOIT_UNLOCKED);
368 module_put(ops->owner);
372 static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
373 u32 prio, struct tcf_chain *chain,
375 struct netlink_ext_ack *extack)
377 struct tcf_proto *tp;
380 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
382 return ERR_PTR(-ENOBUFS);
384 tp->ops = tcf_proto_lookup_ops(kind, rtnl_held, extack);
385 if (IS_ERR(tp->ops)) {
386 err = PTR_ERR(tp->ops);
389 tp->classify = tp->ops->classify;
390 tp->protocol = protocol;
393 spin_lock_init(&tp->lock);
394 refcount_set(&tp->refcnt, 1);
396 err = tp->ops->init(tp);
398 module_put(tp->ops->owner);
408 static void tcf_proto_get(struct tcf_proto *tp)
410 refcount_inc(&tp->refcnt);
413 static void tcf_chain_put(struct tcf_chain *chain);
415 static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held,
416 bool sig_destroy, struct netlink_ext_ack *extack)
418 tp->ops->destroy(tp, rtnl_held, extack);
420 tcf_proto_signal_destroyed(tp->chain, tp);
421 tcf_chain_put(tp->chain);
422 module_put(tp->ops->owner);
426 static void tcf_proto_put(struct tcf_proto *tp, bool rtnl_held,
427 struct netlink_ext_ack *extack)
429 if (refcount_dec_and_test(&tp->refcnt))
430 tcf_proto_destroy(tp, rtnl_held, true, extack);
433 static bool tcf_proto_check_delete(struct tcf_proto *tp)
435 if (tp->ops->delete_empty)
436 return tp->ops->delete_empty(tp);
442 static void tcf_proto_mark_delete(struct tcf_proto *tp)
444 spin_lock(&tp->lock);
446 spin_unlock(&tp->lock);
449 static bool tcf_proto_is_deleting(struct tcf_proto *tp)
453 spin_lock(&tp->lock);
454 deleting = tp->deleting;
455 spin_unlock(&tp->lock);
460 #define ASSERT_BLOCK_LOCKED(block) \
461 lockdep_assert_held(&(block)->lock)
463 struct tcf_filter_chain_list_item {
464 struct list_head list;
465 tcf_chain_head_change_t *chain_head_change;
466 void *chain_head_change_priv;
469 static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
472 struct tcf_chain *chain;
474 ASSERT_BLOCK_LOCKED(block);
476 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
479 list_add_tail_rcu(&chain->list, &block->chain_list);
480 mutex_init(&chain->filter_chain_lock);
481 chain->block = block;
482 chain->index = chain_index;
485 block->chain0.chain = chain;
489 static void tcf_chain_head_change_item(struct tcf_filter_chain_list_item *item,
490 struct tcf_proto *tp_head)
492 if (item->chain_head_change)
493 item->chain_head_change(tp_head, item->chain_head_change_priv);
496 static void tcf_chain0_head_change(struct tcf_chain *chain,
497 struct tcf_proto *tp_head)
499 struct tcf_filter_chain_list_item *item;
500 struct tcf_block *block = chain->block;
505 mutex_lock(&block->lock);
506 list_for_each_entry(item, &block->chain0.filter_chain_list, list)
507 tcf_chain_head_change_item(item, tp_head);
508 mutex_unlock(&block->lock);
511 /* Returns true if block can be safely freed. */
513 static bool tcf_chain_detach(struct tcf_chain *chain)
515 struct tcf_block *block = chain->block;
517 ASSERT_BLOCK_LOCKED(block);
519 list_del_rcu(&chain->list);
521 block->chain0.chain = NULL;
523 if (list_empty(&block->chain_list) &&
524 refcount_read(&block->refcnt) == 0)
530 static void tcf_block_destroy(struct tcf_block *block)
532 mutex_destroy(&block->lock);
533 mutex_destroy(&block->proto_destroy_lock);
534 kfree_rcu(block, rcu);
537 static void tcf_chain_destroy(struct tcf_chain *chain, bool free_block)
539 struct tcf_block *block = chain->block;
541 mutex_destroy(&chain->filter_chain_lock);
542 kfree_rcu(chain, rcu);
544 tcf_block_destroy(block);
547 static void tcf_chain_hold(struct tcf_chain *chain)
549 ASSERT_BLOCK_LOCKED(chain->block);
554 static bool tcf_chain_held_by_acts_only(struct tcf_chain *chain)
556 ASSERT_BLOCK_LOCKED(chain->block);
558 /* In case all the references are action references, this
559 * chain should not be shown to the user.
561 return chain->refcnt == chain->action_refcnt;
564 static struct tcf_chain *tcf_chain_lookup(struct tcf_block *block,
567 struct tcf_chain *chain;
569 ASSERT_BLOCK_LOCKED(block);
571 list_for_each_entry(chain, &block->chain_list, list) {
572 if (chain->index == chain_index)
578 #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
579 static struct tcf_chain *tcf_chain_lookup_rcu(const struct tcf_block *block,
582 struct tcf_chain *chain;
584 list_for_each_entry_rcu(chain, &block->chain_list, list) {
585 if (chain->index == chain_index)
592 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
593 u32 seq, u16 flags, int event, bool unicast,
594 struct netlink_ext_ack *extack);
596 static struct tcf_chain *__tcf_chain_get(struct tcf_block *block,
597 u32 chain_index, bool create,
600 struct tcf_chain *chain = NULL;
601 bool is_first_reference;
603 mutex_lock(&block->lock);
604 chain = tcf_chain_lookup(block, chain_index);
606 tcf_chain_hold(chain);
610 chain = tcf_chain_create(block, chain_index);
616 ++chain->action_refcnt;
617 is_first_reference = chain->refcnt - chain->action_refcnt == 1;
618 mutex_unlock(&block->lock);
620 /* Send notification only in case we got the first
621 * non-action reference. Until then, the chain acts only as
622 * a placeholder for actions pointing to it and user ought
623 * not know about them.
625 if (is_first_reference && !by_act)
626 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
627 RTM_NEWCHAIN, false, NULL);
632 mutex_unlock(&block->lock);
636 static struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
639 return __tcf_chain_get(block, chain_index, create, false);
642 struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block, u32 chain_index)
644 return __tcf_chain_get(block, chain_index, true, true);
646 EXPORT_SYMBOL(tcf_chain_get_by_act);
648 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
650 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
651 void *tmplt_priv, u32 chain_index,
652 struct tcf_block *block, struct sk_buff *oskb,
653 u32 seq, u16 flags, bool unicast);
655 static void __tcf_chain_put(struct tcf_chain *chain, bool by_act,
656 bool explicitly_created)
658 struct tcf_block *block = chain->block;
659 const struct tcf_proto_ops *tmplt_ops;
660 unsigned int refcnt, non_act_refcnt;
661 bool free_block = false;
664 mutex_lock(&block->lock);
665 if (explicitly_created) {
666 if (!chain->explicitly_created) {
667 mutex_unlock(&block->lock);
670 chain->explicitly_created = false;
674 chain->action_refcnt--;
676 /* tc_chain_notify_delete can't be called while holding block lock.
677 * However, when block is unlocked chain can be changed concurrently, so
678 * save these to temporary variables.
680 refcnt = --chain->refcnt;
681 non_act_refcnt = refcnt - chain->action_refcnt;
682 tmplt_ops = chain->tmplt_ops;
683 tmplt_priv = chain->tmplt_priv;
685 if (non_act_refcnt == chain->explicitly_created && !by_act) {
686 if (non_act_refcnt == 0)
687 tc_chain_notify_delete(tmplt_ops, tmplt_priv,
688 chain->index, block, NULL, 0, 0,
690 /* Last reference to chain, no need to lock. */
691 chain->flushing = false;
695 free_block = tcf_chain_detach(chain);
696 mutex_unlock(&block->lock);
699 tc_chain_tmplt_del(tmplt_ops, tmplt_priv);
700 tcf_chain_destroy(chain, free_block);
704 static void tcf_chain_put(struct tcf_chain *chain)
706 __tcf_chain_put(chain, false, false);
709 void tcf_chain_put_by_act(struct tcf_chain *chain)
711 __tcf_chain_put(chain, true, false);
713 EXPORT_SYMBOL(tcf_chain_put_by_act);
715 static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
717 __tcf_chain_put(chain, false, true);
720 static void tcf_chain_flush(struct tcf_chain *chain, bool rtnl_held)
722 struct tcf_proto *tp, *tp_next;
724 mutex_lock(&chain->filter_chain_lock);
725 tp = tcf_chain_dereference(chain->filter_chain, chain);
727 tp_next = rcu_dereference_protected(tp->next, 1);
728 tcf_proto_signal_destroying(chain, tp);
731 tp = tcf_chain_dereference(chain->filter_chain, chain);
732 RCU_INIT_POINTER(chain->filter_chain, NULL);
733 tcf_chain0_head_change(chain, NULL);
734 chain->flushing = true;
735 mutex_unlock(&chain->filter_chain_lock);
738 tp_next = rcu_dereference_protected(tp->next, 1);
739 tcf_proto_put(tp, rtnl_held, NULL);
744 static int tcf_block_setup(struct tcf_block *block,
745 struct flow_block_offload *bo);
747 static void tcf_block_offload_init(struct flow_block_offload *bo,
748 struct net_device *dev, struct Qdisc *sch,
749 enum flow_block_command command,
750 enum flow_block_binder_type binder_type,
751 struct flow_block *flow_block,
752 bool shared, struct netlink_ext_ack *extack)
754 bo->net = dev_net(dev);
755 bo->command = command;
756 bo->binder_type = binder_type;
757 bo->block = flow_block;
758 bo->block_shared = shared;
761 bo->cb_list_head = &flow_block->cb_list;
762 INIT_LIST_HEAD(&bo->cb_list);
765 static void tcf_block_unbind(struct tcf_block *block,
766 struct flow_block_offload *bo);
768 static void tc_block_indr_cleanup(struct flow_block_cb *block_cb)
770 struct tcf_block *block = block_cb->indr.data;
771 struct net_device *dev = block_cb->indr.dev;
772 struct Qdisc *sch = block_cb->indr.sch;
773 struct netlink_ext_ack extack = {};
774 struct flow_block_offload bo = {};
776 tcf_block_offload_init(&bo, dev, sch, FLOW_BLOCK_UNBIND,
777 block_cb->indr.binder_type,
778 &block->flow_block, tcf_block_shared(block),
781 down_write(&block->cb_lock);
782 list_del(&block_cb->driver_list);
783 list_move(&block_cb->list, &bo.cb_list);
784 tcf_block_unbind(block, &bo);
785 up_write(&block->cb_lock);
789 static bool tcf_block_offload_in_use(struct tcf_block *block)
791 return atomic_read(&block->offloadcnt);
794 static int tcf_block_offload_cmd(struct tcf_block *block,
795 struct net_device *dev, struct Qdisc *sch,
796 struct tcf_block_ext_info *ei,
797 enum flow_block_command command,
798 struct netlink_ext_ack *extack)
800 struct flow_block_offload bo = {};
802 tcf_block_offload_init(&bo, dev, sch, command, ei->binder_type,
803 &block->flow_block, tcf_block_shared(block),
806 if (dev->netdev_ops->ndo_setup_tc) {
809 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
811 if (err != -EOPNOTSUPP)
812 NL_SET_ERR_MSG(extack, "Driver ndo_setup_tc failed");
816 return tcf_block_setup(block, &bo);
819 flow_indr_dev_setup_offload(dev, sch, TC_SETUP_BLOCK, block, &bo,
820 tc_block_indr_cleanup);
821 tcf_block_setup(block, &bo);
826 static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
827 struct tcf_block_ext_info *ei,
828 struct netlink_ext_ack *extack)
830 struct net_device *dev = q->dev_queue->dev;
833 down_write(&block->cb_lock);
835 /* If tc offload feature is disabled and the block we try to bind
836 * to already has some offloaded filters, forbid to bind.
838 if (dev->netdev_ops->ndo_setup_tc &&
839 !tc_can_offload(dev) &&
840 tcf_block_offload_in_use(block)) {
841 NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
846 err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_BIND, extack);
847 if (err == -EOPNOTSUPP)
848 goto no_offload_dev_inc;
852 up_write(&block->cb_lock);
856 if (tcf_block_offload_in_use(block))
860 block->nooffloaddevcnt++;
862 up_write(&block->cb_lock);
866 static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
867 struct tcf_block_ext_info *ei)
869 struct net_device *dev = q->dev_queue->dev;
872 down_write(&block->cb_lock);
873 err = tcf_block_offload_cmd(block, dev, q, ei, FLOW_BLOCK_UNBIND, NULL);
874 if (err == -EOPNOTSUPP)
875 goto no_offload_dev_dec;
876 up_write(&block->cb_lock);
880 WARN_ON(block->nooffloaddevcnt-- == 0);
881 up_write(&block->cb_lock);
885 tcf_chain0_head_change_cb_add(struct tcf_block *block,
886 struct tcf_block_ext_info *ei,
887 struct netlink_ext_ack *extack)
889 struct tcf_filter_chain_list_item *item;
890 struct tcf_chain *chain0;
892 item = kmalloc(sizeof(*item), GFP_KERNEL);
894 NL_SET_ERR_MSG(extack, "Memory allocation for head change callback item failed");
897 item->chain_head_change = ei->chain_head_change;
898 item->chain_head_change_priv = ei->chain_head_change_priv;
900 mutex_lock(&block->lock);
901 chain0 = block->chain0.chain;
903 tcf_chain_hold(chain0);
905 list_add(&item->list, &block->chain0.filter_chain_list);
906 mutex_unlock(&block->lock);
909 struct tcf_proto *tp_head;
911 mutex_lock(&chain0->filter_chain_lock);
913 tp_head = tcf_chain_dereference(chain0->filter_chain, chain0);
915 tcf_chain_head_change_item(item, tp_head);
917 mutex_lock(&block->lock);
918 list_add(&item->list, &block->chain0.filter_chain_list);
919 mutex_unlock(&block->lock);
921 mutex_unlock(&chain0->filter_chain_lock);
922 tcf_chain_put(chain0);
929 tcf_chain0_head_change_cb_del(struct tcf_block *block,
930 struct tcf_block_ext_info *ei)
932 struct tcf_filter_chain_list_item *item;
934 mutex_lock(&block->lock);
935 list_for_each_entry(item, &block->chain0.filter_chain_list, list) {
936 if ((!ei->chain_head_change && !ei->chain_head_change_priv) ||
937 (item->chain_head_change == ei->chain_head_change &&
938 item->chain_head_change_priv == ei->chain_head_change_priv)) {
939 if (block->chain0.chain)
940 tcf_chain_head_change_item(item, NULL);
941 list_del(&item->list);
942 mutex_unlock(&block->lock);
948 mutex_unlock(&block->lock);
953 spinlock_t idr_lock; /* Protects idr */
957 static unsigned int tcf_net_id;
959 static int tcf_block_insert(struct tcf_block *block, struct net *net,
960 struct netlink_ext_ack *extack)
962 struct tcf_net *tn = net_generic(net, tcf_net_id);
965 idr_preload(GFP_KERNEL);
966 spin_lock(&tn->idr_lock);
967 err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
969 spin_unlock(&tn->idr_lock);
975 static void tcf_block_remove(struct tcf_block *block, struct net *net)
977 struct tcf_net *tn = net_generic(net, tcf_net_id);
979 spin_lock(&tn->idr_lock);
980 idr_remove(&tn->idr, block->index);
981 spin_unlock(&tn->idr_lock);
984 static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
986 struct netlink_ext_ack *extack)
988 struct tcf_block *block;
990 block = kzalloc(sizeof(*block), GFP_KERNEL);
992 NL_SET_ERR_MSG(extack, "Memory allocation for block failed");
993 return ERR_PTR(-ENOMEM);
995 mutex_init(&block->lock);
996 mutex_init(&block->proto_destroy_lock);
997 init_rwsem(&block->cb_lock);
998 flow_block_init(&block->flow_block);
999 INIT_LIST_HEAD(&block->chain_list);
1000 INIT_LIST_HEAD(&block->owner_list);
1001 INIT_LIST_HEAD(&block->chain0.filter_chain_list);
1003 refcount_set(&block->refcnt, 1);
1005 block->index = block_index;
1007 /* Don't store q pointer for blocks which are shared */
1008 if (!tcf_block_shared(block))
1013 static struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index)
1015 struct tcf_net *tn = net_generic(net, tcf_net_id);
1017 return idr_find(&tn->idr, block_index);
1020 static struct tcf_block *tcf_block_refcnt_get(struct net *net, u32 block_index)
1022 struct tcf_block *block;
1025 block = tcf_block_lookup(net, block_index);
1026 if (block && !refcount_inc_not_zero(&block->refcnt))
1033 static struct tcf_chain *
1034 __tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1036 mutex_lock(&block->lock);
1038 chain = list_is_last(&chain->list, &block->chain_list) ?
1039 NULL : list_next_entry(chain, list);
1041 chain = list_first_entry_or_null(&block->chain_list,
1042 struct tcf_chain, list);
1044 /* skip all action-only chains */
1045 while (chain && tcf_chain_held_by_acts_only(chain))
1046 chain = list_is_last(&chain->list, &block->chain_list) ?
1047 NULL : list_next_entry(chain, list);
1050 tcf_chain_hold(chain);
1051 mutex_unlock(&block->lock);
1056 /* Function to be used by all clients that want to iterate over all chains on
1057 * block. It properly obtains block->lock and takes reference to chain before
1058 * returning it. Users of this function must be tolerant to concurrent chain
1059 * insertion/deletion or ensure that no concurrent chain modification is
1060 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1061 * consistent dump because rtnl lock is released each time skb is filled with
1062 * data and sent to user-space.
1066 tcf_get_next_chain(struct tcf_block *block, struct tcf_chain *chain)
1068 struct tcf_chain *chain_next = __tcf_get_next_chain(block, chain);
1071 tcf_chain_put(chain);
1075 EXPORT_SYMBOL(tcf_get_next_chain);
1077 static struct tcf_proto *
1078 __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
1083 mutex_lock(&chain->filter_chain_lock);
1086 tp = tcf_chain_dereference(chain->filter_chain, chain);
1087 } else if (tcf_proto_is_deleting(tp)) {
1088 /* 'deleting' flag is set and chain->filter_chain_lock was
1089 * unlocked, which means next pointer could be invalid. Restart
1092 prio = tp->prio + 1;
1093 tp = tcf_chain_dereference(chain->filter_chain, chain);
1095 for (; tp; tp = tcf_chain_dereference(tp->next, chain))
1096 if (!tp->deleting && tp->prio >= prio)
1099 tp = tcf_chain_dereference(tp->next, chain);
1105 mutex_unlock(&chain->filter_chain_lock);
1110 /* Function to be used by all clients that want to iterate over all tp's on
1111 * chain. Users of this function must be tolerant to concurrent tp
1112 * insertion/deletion or ensure that no concurrent chain modification is
1113 * possible. Note that all netlink dump callbacks cannot guarantee to provide
1114 * consistent dump because rtnl lock is released each time skb is filled with
1115 * data and sent to user-space.
1119 tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
1121 struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
1124 tcf_proto_put(tp, true, NULL);
1128 EXPORT_SYMBOL(tcf_get_next_proto);
1130 static void tcf_block_flush_all_chains(struct tcf_block *block, bool rtnl_held)
1132 struct tcf_chain *chain;
1134 /* Last reference to block. At this point chains cannot be added or
1135 * removed concurrently.
1137 for (chain = tcf_get_next_chain(block, NULL);
1139 chain = tcf_get_next_chain(block, chain)) {
1140 tcf_chain_put_explicitly_created(chain);
1141 tcf_chain_flush(chain, rtnl_held);
1145 /* Lookup Qdisc and increments its reference counter.
1146 * Set parent, if necessary.
1149 static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
1150 u32 *parent, int ifindex, bool rtnl_held,
1151 struct netlink_ext_ack *extack)
1153 const struct Qdisc_class_ops *cops;
1154 struct net_device *dev;
1157 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1163 dev = dev_get_by_index_rcu(net, ifindex);
1171 *q = rcu_dereference(dev->qdisc);
1172 *parent = (*q)->handle;
1174 *q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
1176 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1182 *q = qdisc_refcount_inc_nz(*q);
1184 NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
1189 /* Is it classful? */
1190 cops = (*q)->ops->cl_ops;
1192 NL_SET_ERR_MSG(extack, "Qdisc not classful");
1197 if (!cops->tcf_block) {
1198 NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
1204 /* At this point we know that qdisc is not noop_qdisc,
1205 * which means that qdisc holds a reference to net_device
1206 * and we hold a reference to qdisc, so it is safe to release
1218 qdisc_put_unlocked(*q);
1224 static int __tcf_qdisc_cl_find(struct Qdisc *q, u32 parent, unsigned long *cl,
1225 int ifindex, struct netlink_ext_ack *extack)
1227 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK)
1230 /* Do we search for filter, attached to class? */
1231 if (TC_H_MIN(parent)) {
1232 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1234 *cl = cops->find(q, parent);
1236 NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
1244 static struct tcf_block *__tcf_block_find(struct net *net, struct Qdisc *q,
1245 unsigned long cl, int ifindex,
1247 struct netlink_ext_ack *extack)
1249 struct tcf_block *block;
1251 if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
1252 block = tcf_block_refcnt_get(net, block_index);
1254 NL_SET_ERR_MSG(extack, "Block of given index was not found");
1255 return ERR_PTR(-EINVAL);
1258 const struct Qdisc_class_ops *cops = q->ops->cl_ops;
1260 block = cops->tcf_block(q, cl, extack);
1262 return ERR_PTR(-EINVAL);
1264 if (tcf_block_shared(block)) {
1265 NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
1266 return ERR_PTR(-EOPNOTSUPP);
1269 /* Always take reference to block in order to support execution
1270 * of rules update path of cls API without rtnl lock. Caller
1271 * must release block when it is finished using it. 'if' block
1272 * of this conditional obtain reference to block by calling
1273 * tcf_block_refcnt_get().
1275 refcount_inc(&block->refcnt);
1281 static void __tcf_block_put(struct tcf_block *block, struct Qdisc *q,
1282 struct tcf_block_ext_info *ei, bool rtnl_held)
1284 if (refcount_dec_and_mutex_lock(&block->refcnt, &block->lock)) {
1285 /* Flushing/putting all chains will cause the block to be
1286 * deallocated when last chain is freed. However, if chain_list
1287 * is empty, block has to be manually deallocated. After block
1288 * reference counter reached 0, it is no longer possible to
1289 * increment it or add new chains to block.
1291 bool free_block = list_empty(&block->chain_list);
1293 mutex_unlock(&block->lock);
1294 if (tcf_block_shared(block))
1295 tcf_block_remove(block, block->net);
1298 tcf_block_offload_unbind(block, q, ei);
1301 tcf_block_destroy(block);
1303 tcf_block_flush_all_chains(block, rtnl_held);
1305 tcf_block_offload_unbind(block, q, ei);
1309 static void tcf_block_refcnt_put(struct tcf_block *block, bool rtnl_held)
1311 __tcf_block_put(block, NULL, NULL, rtnl_held);
1315 * Set q, parent, cl when appropriate.
1318 static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
1319 u32 *parent, unsigned long *cl,
1320 int ifindex, u32 block_index,
1321 struct netlink_ext_ack *extack)
1323 struct tcf_block *block;
1328 err = __tcf_qdisc_find(net, q, parent, ifindex, true, extack);
1332 err = __tcf_qdisc_cl_find(*q, *parent, cl, ifindex, extack);
1336 block = __tcf_block_find(net, *q, *cl, ifindex, block_index, extack);
1337 if (IS_ERR(block)) {
1338 err = PTR_ERR(block);
1349 return ERR_PTR(err);
1352 static void tcf_block_release(struct Qdisc *q, struct tcf_block *block,
1355 if (!IS_ERR_OR_NULL(block))
1356 tcf_block_refcnt_put(block, rtnl_held);
1362 qdisc_put_unlocked(q);
1366 struct tcf_block_owner_item {
1367 struct list_head list;
1369 enum flow_block_binder_type binder_type;
1373 tcf_block_owner_netif_keep_dst(struct tcf_block *block,
1375 enum flow_block_binder_type binder_type)
1377 if (block->keep_dst &&
1378 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1379 binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1380 netif_keep_dst(qdisc_dev(q));
1383 void tcf_block_netif_keep_dst(struct tcf_block *block)
1385 struct tcf_block_owner_item *item;
1387 block->keep_dst = true;
1388 list_for_each_entry(item, &block->owner_list, list)
1389 tcf_block_owner_netif_keep_dst(block, item->q,
1392 EXPORT_SYMBOL(tcf_block_netif_keep_dst);
1394 static int tcf_block_owner_add(struct tcf_block *block,
1396 enum flow_block_binder_type binder_type)
1398 struct tcf_block_owner_item *item;
1400 item = kmalloc(sizeof(*item), GFP_KERNEL);
1404 item->binder_type = binder_type;
1405 list_add(&item->list, &block->owner_list);
1409 static void tcf_block_owner_del(struct tcf_block *block,
1411 enum flow_block_binder_type binder_type)
1413 struct tcf_block_owner_item *item;
1415 list_for_each_entry(item, &block->owner_list, list) {
1416 if (item->q == q && item->binder_type == binder_type) {
1417 list_del(&item->list);
1425 int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
1426 struct tcf_block_ext_info *ei,
1427 struct netlink_ext_ack *extack)
1429 struct net *net = qdisc_net(q);
1430 struct tcf_block *block = NULL;
1433 if (ei->block_index)
1434 /* block_index not 0 means the shared block is requested */
1435 block = tcf_block_refcnt_get(net, ei->block_index);
1438 block = tcf_block_create(net, q, ei->block_index, extack);
1440 return PTR_ERR(block);
1441 if (tcf_block_shared(block)) {
1442 err = tcf_block_insert(block, net, extack);
1444 goto err_block_insert;
1448 err = tcf_block_owner_add(block, q, ei->binder_type);
1450 goto err_block_owner_add;
1452 tcf_block_owner_netif_keep_dst(block, q, ei->binder_type);
1454 err = tcf_chain0_head_change_cb_add(block, ei, extack);
1456 goto err_chain0_head_change_cb_add;
1458 err = tcf_block_offload_bind(block, q, ei, extack);
1460 goto err_block_offload_bind;
1465 err_block_offload_bind:
1466 tcf_chain0_head_change_cb_del(block, ei);
1467 err_chain0_head_change_cb_add:
1468 tcf_block_owner_del(block, q, ei->binder_type);
1469 err_block_owner_add:
1471 tcf_block_refcnt_put(block, true);
1474 EXPORT_SYMBOL(tcf_block_get_ext);
1476 static void tcf_chain_head_change_dflt(struct tcf_proto *tp_head, void *priv)
1478 struct tcf_proto __rcu **p_filter_chain = priv;
1480 rcu_assign_pointer(*p_filter_chain, tp_head);
1483 int tcf_block_get(struct tcf_block **p_block,
1484 struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
1485 struct netlink_ext_ack *extack)
1487 struct tcf_block_ext_info ei = {
1488 .chain_head_change = tcf_chain_head_change_dflt,
1489 .chain_head_change_priv = p_filter_chain,
1492 WARN_ON(!p_filter_chain);
1493 return tcf_block_get_ext(p_block, q, &ei, extack);
1495 EXPORT_SYMBOL(tcf_block_get);
1497 /* XXX: Standalone actions are not allowed to jump to any chain, and bound
1498 * actions should be all removed after flushing.
1500 void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
1501 struct tcf_block_ext_info *ei)
1505 tcf_chain0_head_change_cb_del(block, ei);
1506 tcf_block_owner_del(block, q, ei->binder_type);
1508 __tcf_block_put(block, q, ei, true);
1510 EXPORT_SYMBOL(tcf_block_put_ext);
1512 void tcf_block_put(struct tcf_block *block)
1514 struct tcf_block_ext_info ei = {0, };
1518 tcf_block_put_ext(block, block->q, &ei);
1521 EXPORT_SYMBOL(tcf_block_put);
1524 tcf_block_playback_offloads(struct tcf_block *block, flow_setup_cb_t *cb,
1525 void *cb_priv, bool add, bool offload_in_use,
1526 struct netlink_ext_ack *extack)
1528 struct tcf_chain *chain, *chain_prev;
1529 struct tcf_proto *tp, *tp_prev;
1532 lockdep_assert_held(&block->cb_lock);
1534 for (chain = __tcf_get_next_chain(block, NULL);
1537 chain = __tcf_get_next_chain(block, chain),
1538 tcf_chain_put(chain_prev)) {
1539 if (chain->tmplt_ops && add)
1540 chain->tmplt_ops->tmplt_reoffload(chain, true, cb,
1542 for (tp = __tcf_get_next_proto(chain, NULL); tp;
1544 tp = __tcf_get_next_proto(chain, tp),
1545 tcf_proto_put(tp_prev, true, NULL)) {
1546 if (tp->ops->reoffload) {
1547 err = tp->ops->reoffload(tp, add, cb, cb_priv,
1550 goto err_playback_remove;
1551 } else if (add && offload_in_use) {
1553 NL_SET_ERR_MSG(extack, "Filter HW offload failed - classifier without re-offloading support");
1554 goto err_playback_remove;
1557 if (chain->tmplt_ops && !add)
1558 chain->tmplt_ops->tmplt_reoffload(chain, false, cb,
1564 err_playback_remove:
1565 tcf_proto_put(tp, true, NULL);
1566 tcf_chain_put(chain);
1567 tcf_block_playback_offloads(block, cb, cb_priv, false, offload_in_use,
1572 static int tcf_block_bind(struct tcf_block *block,
1573 struct flow_block_offload *bo)
1575 struct flow_block_cb *block_cb, *next;
1578 lockdep_assert_held(&block->cb_lock);
1580 list_for_each_entry(block_cb, &bo->cb_list, list) {
1581 err = tcf_block_playback_offloads(block, block_cb->cb,
1582 block_cb->cb_priv, true,
1583 tcf_block_offload_in_use(block),
1587 if (!bo->unlocked_driver_cb)
1588 block->lockeddevcnt++;
1592 list_splice(&bo->cb_list, &block->flow_block.cb_list);
1597 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
1598 list_del(&block_cb->driver_list);
1600 list_del(&block_cb->list);
1601 tcf_block_playback_offloads(block, block_cb->cb,
1602 block_cb->cb_priv, false,
1603 tcf_block_offload_in_use(block),
1605 if (!bo->unlocked_driver_cb)
1606 block->lockeddevcnt--;
1608 flow_block_cb_free(block_cb);
1614 static void tcf_block_unbind(struct tcf_block *block,
1615 struct flow_block_offload *bo)
1617 struct flow_block_cb *block_cb, *next;
1619 lockdep_assert_held(&block->cb_lock);
1621 list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
1622 tcf_block_playback_offloads(block, block_cb->cb,
1623 block_cb->cb_priv, false,
1624 tcf_block_offload_in_use(block),
1626 list_del(&block_cb->list);
1627 flow_block_cb_free(block_cb);
1628 if (!bo->unlocked_driver_cb)
1629 block->lockeddevcnt--;
1633 static int tcf_block_setup(struct tcf_block *block,
1634 struct flow_block_offload *bo)
1638 switch (bo->command) {
1639 case FLOW_BLOCK_BIND:
1640 err = tcf_block_bind(block, bo);
1642 case FLOW_BLOCK_UNBIND:
1644 tcf_block_unbind(block, bo);
1654 /* Main classifier routine: scans classifier chain attached
1655 * to this qdisc, (optionally) tests for protocol and asks
1656 * specific classifiers.
1658 static inline int __tcf_classify(struct sk_buff *skb,
1659 const struct tcf_proto *tp,
1660 const struct tcf_proto *orig_tp,
1661 struct tcf_result *res,
1663 struct tcf_exts_miss_cookie_node *n,
1665 u32 *last_executed_chain)
1667 #ifdef CONFIG_NET_CLS_ACT
1668 const int max_reclassify_loop = 16;
1669 const struct tcf_proto *first_tp;
1674 for (; tp; tp = rcu_dereference_bh(tp->next)) {
1675 __be16 protocol = skb_protocol(skb, false);
1679 struct tcf_exts *exts;
1681 if (n->tp_prio != tp->prio)
1684 /* We re-lookup the tp and chain based on index instead
1685 * of having hard refs and locks to them, so do a sanity
1686 * check if any of tp,chain,exts was replaced by the
1687 * time we got here with a cookie from hardware.
1689 if (unlikely(n->tp != tp || n->tp->chain != n->chain ||
1690 !tp->ops->get_exts))
1693 exts = tp->ops->get_exts(tp, n->handle);
1694 if (unlikely(!exts || n->exts != exts))
1698 err = tcf_exts_exec_ex(skb, exts, act_index, res);
1700 if (tp->protocol != protocol &&
1701 tp->protocol != htons(ETH_P_ALL))
1704 err = tc_classify(skb, tp, res);
1706 #ifdef CONFIG_NET_CLS_ACT
1707 if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
1709 *last_executed_chain = first_tp->chain->index;
1711 } else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
1712 first_tp = res->goto_tp;
1713 *last_executed_chain = err & TC_ACT_EXT_VAL_MASK;
1724 return TC_ACT_UNSPEC; /* signal: continue lookup */
1725 #ifdef CONFIG_NET_CLS_ACT
1727 if (unlikely(limit++ >= max_reclassify_loop)) {
1728 net_notice_ratelimited("%u: reclassify loop, rule prio %u, protocol %02x\n",
1729 tp->chain->block->index,
1731 ntohs(tp->protocol));
1740 int tcf_classify(struct sk_buff *skb,
1741 const struct tcf_block *block,
1742 const struct tcf_proto *tp,
1743 struct tcf_result *res, bool compat_mode)
1745 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1746 u32 last_executed_chain = 0;
1748 return __tcf_classify(skb, tp, tp, res, compat_mode, NULL, 0,
1749 &last_executed_chain);
1751 u32 last_executed_chain = tp ? tp->chain->index : 0;
1752 struct tcf_exts_miss_cookie_node *n = NULL;
1753 const struct tcf_proto *orig_tp = tp;
1754 struct tc_skb_ext *ext;
1759 ext = skb_ext_find(skb, TC_SKB_EXT);
1761 if (ext && (ext->chain || ext->act_miss)) {
1762 struct tcf_chain *fchain;
1765 if (ext->act_miss) {
1766 n = tcf_exts_miss_cookie_lookup(ext->act_miss_cookie,
1771 chain = n->chain_index;
1776 fchain = tcf_chain_lookup_rcu(block, chain);
1780 /* Consume, so cloned/redirect skbs won't inherit ext */
1781 skb_ext_del(skb, TC_SKB_EXT);
1783 tp = rcu_dereference_bh(fchain->filter_chain);
1784 last_executed_chain = fchain->index;
1788 ret = __tcf_classify(skb, tp, orig_tp, res, compat_mode, n, act_index,
1789 &last_executed_chain);
1791 if (tc_skb_ext_tc_enabled()) {
1792 /* If we missed on some chain */
1793 if (ret == TC_ACT_UNSPEC && last_executed_chain) {
1794 struct tc_skb_cb *cb = tc_skb_cb(skb);
1796 ext = tc_skb_ext_alloc(skb);
1797 if (WARN_ON_ONCE(!ext))
1799 ext->chain = last_executed_chain;
1801 ext->post_ct = cb->post_ct;
1802 ext->post_ct_snat = cb->post_ct_snat;
1803 ext->post_ct_dnat = cb->post_ct_dnat;
1804 ext->zone = cb->zone;
1811 EXPORT_SYMBOL(tcf_classify);
1813 struct tcf_chain_info {
1814 struct tcf_proto __rcu **pprev;
1815 struct tcf_proto __rcu *next;
1818 static struct tcf_proto *tcf_chain_tp_prev(struct tcf_chain *chain,
1819 struct tcf_chain_info *chain_info)
1821 return tcf_chain_dereference(*chain_info->pprev, chain);
1824 static int tcf_chain_tp_insert(struct tcf_chain *chain,
1825 struct tcf_chain_info *chain_info,
1826 struct tcf_proto *tp)
1828 if (chain->flushing)
1831 RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
1832 if (*chain_info->pprev == chain->filter_chain)
1833 tcf_chain0_head_change(chain, tp);
1835 rcu_assign_pointer(*chain_info->pprev, tp);
1840 static void tcf_chain_tp_remove(struct tcf_chain *chain,
1841 struct tcf_chain_info *chain_info,
1842 struct tcf_proto *tp)
1844 struct tcf_proto *next = tcf_chain_dereference(chain_info->next, chain);
1846 tcf_proto_mark_delete(tp);
1847 if (tp == chain->filter_chain)
1848 tcf_chain0_head_change(chain, next);
1849 RCU_INIT_POINTER(*chain_info->pprev, next);
1852 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1853 struct tcf_chain_info *chain_info,
1854 u32 protocol, u32 prio,
1855 bool prio_allocate);
1857 /* Try to insert new proto.
1858 * If proto with specified priority already exists, free new proto
1859 * and return existing one.
1862 static struct tcf_proto *tcf_chain_tp_insert_unique(struct tcf_chain *chain,
1863 struct tcf_proto *tp_new,
1864 u32 protocol, u32 prio,
1867 struct tcf_chain_info chain_info;
1868 struct tcf_proto *tp;
1871 mutex_lock(&chain->filter_chain_lock);
1873 if (tcf_proto_exists_destroying(chain, tp_new)) {
1874 mutex_unlock(&chain->filter_chain_lock);
1875 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1876 return ERR_PTR(-EAGAIN);
1879 tp = tcf_chain_tp_find(chain, &chain_info,
1880 protocol, prio, false);
1882 err = tcf_chain_tp_insert(chain, &chain_info, tp_new);
1883 mutex_unlock(&chain->filter_chain_lock);
1886 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1889 tcf_proto_destroy(tp_new, rtnl_held, false, NULL);
1890 tp_new = ERR_PTR(err);
1896 static void tcf_chain_tp_delete_empty(struct tcf_chain *chain,
1897 struct tcf_proto *tp, bool rtnl_held,
1898 struct netlink_ext_ack *extack)
1900 struct tcf_chain_info chain_info;
1901 struct tcf_proto *tp_iter;
1902 struct tcf_proto **pprev;
1903 struct tcf_proto *next;
1905 mutex_lock(&chain->filter_chain_lock);
1907 /* Atomically find and remove tp from chain. */
1908 for (pprev = &chain->filter_chain;
1909 (tp_iter = tcf_chain_dereference(*pprev, chain));
1910 pprev = &tp_iter->next) {
1911 if (tp_iter == tp) {
1912 chain_info.pprev = pprev;
1913 chain_info.next = tp_iter->next;
1914 WARN_ON(tp_iter->deleting);
1918 /* Verify that tp still exists and no new filters were inserted
1920 * Mark tp for deletion if it is empty.
1922 if (!tp_iter || !tcf_proto_check_delete(tp)) {
1923 mutex_unlock(&chain->filter_chain_lock);
1927 tcf_proto_signal_destroying(chain, tp);
1928 next = tcf_chain_dereference(chain_info.next, chain);
1929 if (tp == chain->filter_chain)
1930 tcf_chain0_head_change(chain, next);
1931 RCU_INIT_POINTER(*chain_info.pprev, next);
1932 mutex_unlock(&chain->filter_chain_lock);
1934 tcf_proto_put(tp, rtnl_held, extack);
1937 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
1938 struct tcf_chain_info *chain_info,
1939 u32 protocol, u32 prio,
1942 struct tcf_proto **pprev;
1943 struct tcf_proto *tp;
1945 /* Check the chain for existence of proto-tcf with this priority */
1946 for (pprev = &chain->filter_chain;
1947 (tp = tcf_chain_dereference(*pprev, chain));
1948 pprev = &tp->next) {
1949 if (tp->prio >= prio) {
1950 if (tp->prio == prio) {
1951 if (prio_allocate ||
1952 (tp->protocol != protocol && protocol))
1953 return ERR_PTR(-EINVAL);
1960 chain_info->pprev = pprev;
1962 chain_info->next = tp->next;
1965 chain_info->next = NULL;
1970 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
1971 struct tcf_proto *tp, struct tcf_block *block,
1972 struct Qdisc *q, u32 parent, void *fh,
1973 u32 portid, u32 seq, u16 flags, int event,
1974 bool terse_dump, bool rtnl_held,
1975 struct netlink_ext_ack *extack)
1978 struct nlmsghdr *nlh;
1979 unsigned char *b = skb_tail_pointer(skb);
1981 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1983 goto out_nlmsg_trim;
1984 tcm = nlmsg_data(nlh);
1985 tcm->tcm_family = AF_UNSPEC;
1989 tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
1990 tcm->tcm_parent = parent;
1992 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
1993 tcm->tcm_block_index = block->index;
1995 tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
1996 if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
1997 goto nla_put_failure;
1998 if (nla_put_u32(skb, TCA_CHAIN, tp->chain->index))
1999 goto nla_put_failure;
2001 tcm->tcm_handle = 0;
2002 } else if (terse_dump) {
2003 if (tp->ops->terse_dump) {
2004 if (tp->ops->terse_dump(net, tp, fh, skb, tcm,
2006 goto nla_put_failure;
2008 goto cls_op_not_supp;
2011 if (tp->ops->dump &&
2012 tp->ops->dump(net, tp, fh, skb, tcm, rtnl_held) < 0)
2013 goto nla_put_failure;
2016 if (extack && extack->_msg &&
2017 nla_put_string(skb, TCA_EXT_WARN_MSG, extack->_msg))
2018 goto nla_put_failure;
2020 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2031 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
2032 struct nlmsghdr *n, struct tcf_proto *tp,
2033 struct tcf_block *block, struct Qdisc *q,
2034 u32 parent, void *fh, int event, bool unicast,
2035 bool rtnl_held, struct netlink_ext_ack *extack)
2037 struct sk_buff *skb;
2038 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2041 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2045 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
2046 n->nlmsg_seq, n->nlmsg_flags, event,
2047 false, rtnl_held, extack) <= 0) {
2053 err = rtnl_unicast(skb, net, portid);
2055 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2056 n->nlmsg_flags & NLM_F_ECHO);
2060 static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
2061 struct nlmsghdr *n, struct tcf_proto *tp,
2062 struct tcf_block *block, struct Qdisc *q,
2063 u32 parent, void *fh, bool unicast, bool *last,
2064 bool rtnl_held, struct netlink_ext_ack *extack)
2066 struct sk_buff *skb;
2067 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2070 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2074 if (tcf_fill_node(net, skb, tp, block, q, parent, fh, portid,
2075 n->nlmsg_seq, n->nlmsg_flags, RTM_DELTFILTER,
2076 false, rtnl_held, extack) <= 0) {
2077 NL_SET_ERR_MSG(extack, "Failed to build del event notification");
2082 err = tp->ops->delete(tp, fh, last, rtnl_held, extack);
2089 err = rtnl_unicast(skb, net, portid);
2091 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2092 n->nlmsg_flags & NLM_F_ECHO);
2094 NL_SET_ERR_MSG(extack, "Failed to send filter delete notification");
2099 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
2100 struct tcf_block *block, struct Qdisc *q,
2101 u32 parent, struct nlmsghdr *n,
2102 struct tcf_chain *chain, int event,
2103 struct netlink_ext_ack *extack)
2105 struct tcf_proto *tp;
2107 for (tp = tcf_get_next_proto(chain, NULL);
2108 tp; tp = tcf_get_next_proto(chain, tp))
2109 tfilter_notify(net, oskb, n, tp, block, q, parent, NULL,
2110 event, false, true, extack);
2113 static void tfilter_put(struct tcf_proto *tp, void *fh)
2115 if (tp->ops->put && fh)
2116 tp->ops->put(tp, fh);
2119 static bool is_qdisc_ingress(__u32 classid)
2121 return (TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_INGRESS));
2124 static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2125 struct netlink_ext_ack *extack)
2127 struct net *net = sock_net(skb->sk);
2128 struct nlattr *tca[TCA_MAX + 1];
2129 char name[IFNAMSIZ];
2137 struct tcf_chain_info chain_info;
2138 struct tcf_chain *chain;
2139 struct tcf_block *block;
2140 struct tcf_proto *tp;
2145 bool rtnl_held = false;
2151 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2152 rtm_tca_policy, extack);
2157 protocol = TC_H_MIN(t->tcm_info);
2158 prio = TC_H_MAJ(t->tcm_info);
2159 prio_allocate = false;
2160 parent = t->tcm_parent;
2169 /* If no priority is provided by the user,
2172 if (n->nlmsg_flags & NLM_F_CREATE) {
2173 prio = TC_H_MAKE(0x80000000U, 0U);
2174 prio_allocate = true;
2176 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2181 /* Find head of filter chain. */
2183 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2187 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2188 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2193 /* Take rtnl mutex if rtnl_held was set to true on previous iteration,
2194 * block is shared (no qdisc found), qdisc is not unlocked, classifier
2195 * type is not specified, classifier is not unlocked.
2198 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2199 !tcf_proto_is_unlocked(name)) {
2204 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2208 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2210 if (IS_ERR(block)) {
2211 err = PTR_ERR(block);
2214 block->classid = parent;
2216 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2217 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2218 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2222 chain = tcf_chain_get(block, chain_index, true);
2224 NL_SET_ERR_MSG(extack, "Cannot create specified filter chain");
2229 mutex_lock(&chain->filter_chain_lock);
2230 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2231 prio, prio_allocate);
2233 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2239 struct tcf_proto *tp_new = NULL;
2241 if (chain->flushing) {
2246 /* Proto-tcf does not exist, create new one */
2248 if (tca[TCA_KIND] == NULL || !protocol) {
2249 NL_SET_ERR_MSG(extack, "Filter kind and protocol must be specified");
2254 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2255 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2261 prio = tcf_auto_prio(tcf_chain_tp_prev(chain,
2264 mutex_unlock(&chain->filter_chain_lock);
2265 tp_new = tcf_proto_create(name, protocol, prio, chain,
2267 if (IS_ERR(tp_new)) {
2268 err = PTR_ERR(tp_new);
2273 tp = tcf_chain_tp_insert_unique(chain, tp_new, protocol, prio,
2280 mutex_unlock(&chain->filter_chain_lock);
2283 if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2284 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2289 fh = tp->ops->get(tp, t->tcm_handle);
2292 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
2293 NL_SET_ERR_MSG(extack, "Need both RTM_NEWTFILTER and NLM_F_CREATE to create a new filter");
2297 } else if (n->nlmsg_flags & NLM_F_EXCL) {
2298 tfilter_put(tp, fh);
2299 NL_SET_ERR_MSG(extack, "Filter already exists");
2304 if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
2305 tfilter_put(tp, fh);
2306 NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
2311 if (!(n->nlmsg_flags & NLM_F_CREATE))
2312 flags |= TCA_ACT_FLAGS_REPLACE;
2314 flags |= TCA_ACT_FLAGS_NO_RTNL;
2315 if (is_qdisc_ingress(parent))
2316 flags |= TCA_ACT_FLAGS_AT_INGRESS;
2317 err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
2320 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2321 RTM_NEWTFILTER, false, rtnl_held, extack);
2322 tfilter_put(tp, fh);
2323 /* q pointer is NULL for shared blocks */
2325 q->flags &= ~TCQ_F_CAN_BYPASS;
2329 if (err && tp_created)
2330 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, NULL);
2333 if (tp && !IS_ERR(tp))
2334 tcf_proto_put(tp, rtnl_held, NULL);
2336 tcf_chain_put(chain);
2338 tcf_block_release(q, block, rtnl_held);
2343 if (err == -EAGAIN) {
2344 /* Take rtnl lock in case EAGAIN is caused by concurrent flush
2348 /* Replay the request. */
2354 mutex_unlock(&chain->filter_chain_lock);
2358 static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2359 struct netlink_ext_ack *extack)
2361 struct net *net = sock_net(skb->sk);
2362 struct nlattr *tca[TCA_MAX + 1];
2363 char name[IFNAMSIZ];
2369 struct Qdisc *q = NULL;
2370 struct tcf_chain_info chain_info;
2371 struct tcf_chain *chain = NULL;
2372 struct tcf_block *block = NULL;
2373 struct tcf_proto *tp = NULL;
2374 unsigned long cl = 0;
2377 bool rtnl_held = false;
2379 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2380 rtm_tca_policy, extack);
2385 protocol = TC_H_MIN(t->tcm_info);
2386 prio = TC_H_MAJ(t->tcm_info);
2387 parent = t->tcm_parent;
2389 if (prio == 0 && (protocol || t->tcm_handle || tca[TCA_KIND])) {
2390 NL_SET_ERR_MSG(extack, "Cannot flush filters with protocol, handle or kind set");
2394 /* Find head of filter chain. */
2396 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2400 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2401 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2405 /* Take rtnl mutex if flushing whole chain, block is shared (no qdisc
2406 * found), qdisc is not unlocked, classifier type is not specified,
2407 * classifier is not unlocked.
2410 (q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2411 !tcf_proto_is_unlocked(name)) {
2416 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2420 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2422 if (IS_ERR(block)) {
2423 err = PTR_ERR(block);
2427 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2428 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2429 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2433 chain = tcf_chain_get(block, chain_index, false);
2435 /* User requested flush on non-existent chain. Nothing to do,
2436 * so just return success.
2442 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2448 tfilter_notify_chain(net, skb, block, q, parent, n,
2449 chain, RTM_DELTFILTER, extack);
2450 tcf_chain_flush(chain, rtnl_held);
2455 mutex_lock(&chain->filter_chain_lock);
2456 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2458 if (!tp || IS_ERR(tp)) {
2459 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2460 err = tp ? PTR_ERR(tp) : -ENOENT;
2462 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2463 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2466 } else if (t->tcm_handle == 0) {
2467 tcf_proto_signal_destroying(chain, tp);
2468 tcf_chain_tp_remove(chain, &chain_info, tp);
2469 mutex_unlock(&chain->filter_chain_lock);
2471 tcf_proto_put(tp, rtnl_held, NULL);
2472 tfilter_notify(net, skb, n, tp, block, q, parent, fh,
2473 RTM_DELTFILTER, false, rtnl_held, extack);
2477 mutex_unlock(&chain->filter_chain_lock);
2479 fh = tp->ops->get(tp, t->tcm_handle);
2482 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2487 err = tfilter_del_notify(net, skb, n, tp, block,
2488 q, parent, fh, false, &last,
2494 tcf_chain_tp_delete_empty(chain, tp, rtnl_held, extack);
2499 if (tp && !IS_ERR(tp))
2500 tcf_proto_put(tp, rtnl_held, NULL);
2501 tcf_chain_put(chain);
2503 tcf_block_release(q, block, rtnl_held);
2511 mutex_unlock(&chain->filter_chain_lock);
2515 static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
2516 struct netlink_ext_ack *extack)
2518 struct net *net = sock_net(skb->sk);
2519 struct nlattr *tca[TCA_MAX + 1];
2520 char name[IFNAMSIZ];
2526 struct Qdisc *q = NULL;
2527 struct tcf_chain_info chain_info;
2528 struct tcf_chain *chain = NULL;
2529 struct tcf_block *block = NULL;
2530 struct tcf_proto *tp = NULL;
2531 unsigned long cl = 0;
2534 bool rtnl_held = false;
2536 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
2537 rtm_tca_policy, extack);
2542 protocol = TC_H_MIN(t->tcm_info);
2543 prio = TC_H_MAJ(t->tcm_info);
2544 parent = t->tcm_parent;
2547 NL_SET_ERR_MSG(extack, "Invalid filter command with priority of zero");
2551 /* Find head of filter chain. */
2553 err = __tcf_qdisc_find(net, &q, &parent, t->tcm_ifindex, false, extack);
2557 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2558 NL_SET_ERR_MSG(extack, "Specified TC filter name too long");
2562 /* Take rtnl mutex if block is shared (no qdisc found), qdisc is not
2563 * unlocked, classifier type is not specified, classifier is not
2566 if ((q && !(q->ops->cl_ops->flags & QDISC_CLASS_OPS_DOIT_UNLOCKED)) ||
2567 !tcf_proto_is_unlocked(name)) {
2572 err = __tcf_qdisc_cl_find(q, parent, &cl, t->tcm_ifindex, extack);
2576 block = __tcf_block_find(net, q, cl, t->tcm_ifindex, t->tcm_block_index,
2578 if (IS_ERR(block)) {
2579 err = PTR_ERR(block);
2583 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
2584 if (chain_index > TC_ACT_EXT_VAL_MASK) {
2585 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
2589 chain = tcf_chain_get(block, chain_index, false);
2591 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
2596 mutex_lock(&chain->filter_chain_lock);
2597 tp = tcf_chain_tp_find(chain, &chain_info, protocol,
2599 mutex_unlock(&chain->filter_chain_lock);
2600 if (!tp || IS_ERR(tp)) {
2601 NL_SET_ERR_MSG(extack, "Filter with specified priority/protocol not found");
2602 err = tp ? PTR_ERR(tp) : -ENOENT;
2604 } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
2605 NL_SET_ERR_MSG(extack, "Specified filter kind does not match existing one");
2610 fh = tp->ops->get(tp, t->tcm_handle);
2613 NL_SET_ERR_MSG(extack, "Specified filter handle not found");
2616 err = tfilter_notify(net, skb, n, tp, block, q, parent,
2617 fh, RTM_NEWTFILTER, true, rtnl_held, NULL);
2619 NL_SET_ERR_MSG(extack, "Failed to send filter notify message");
2622 tfilter_put(tp, fh);
2625 if (tp && !IS_ERR(tp))
2626 tcf_proto_put(tp, rtnl_held, NULL);
2627 tcf_chain_put(chain);
2629 tcf_block_release(q, block, rtnl_held);
2637 struct tcf_dump_args {
2638 struct tcf_walker w;
2639 struct sk_buff *skb;
2640 struct netlink_callback *cb;
2641 struct tcf_block *block;
2647 static int tcf_node_dump(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
2649 struct tcf_dump_args *a = (void *)arg;
2650 struct net *net = sock_net(a->skb->sk);
2652 return tcf_fill_node(net, a->skb, tp, a->block, a->q, a->parent,
2653 n, NETLINK_CB(a->cb->skb).portid,
2654 a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
2655 RTM_NEWTFILTER, a->terse_dump, true, NULL);
2658 static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
2659 struct sk_buff *skb, struct netlink_callback *cb,
2660 long index_start, long *p_index, bool terse)
2662 struct net *net = sock_net(skb->sk);
2663 struct tcf_block *block = chain->block;
2664 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2665 struct tcf_proto *tp, *tp_prev;
2666 struct tcf_dump_args arg;
2668 for (tp = __tcf_get_next_proto(chain, NULL);
2671 tp = __tcf_get_next_proto(chain, tp),
2672 tcf_proto_put(tp_prev, true, NULL),
2674 if (*p_index < index_start)
2676 if (TC_H_MAJ(tcm->tcm_info) &&
2677 TC_H_MAJ(tcm->tcm_info) != tp->prio)
2679 if (TC_H_MIN(tcm->tcm_info) &&
2680 TC_H_MIN(tcm->tcm_info) != tp->protocol)
2682 if (*p_index > index_start)
2683 memset(&cb->args[1], 0,
2684 sizeof(cb->args) - sizeof(cb->args[0]));
2685 if (cb->args[1] == 0) {
2686 if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
2687 NETLINK_CB(cb->skb).portid,
2688 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2689 RTM_NEWTFILTER, false, true, NULL) <= 0)
2695 arg.w.fn = tcf_node_dump;
2700 arg.parent = parent;
2702 arg.w.skip = cb->args[1] - 1;
2704 arg.w.cookie = cb->args[2];
2705 arg.terse_dump = terse;
2706 tp->ops->walk(tp, &arg.w, true);
2707 cb->args[2] = arg.w.cookie;
2708 cb->args[1] = arg.w.count + 1;
2715 tcf_proto_put(tp, true, NULL);
2719 static const struct nla_policy tcf_tfilter_dump_policy[TCA_MAX + 1] = {
2720 [TCA_DUMP_FLAGS] = NLA_POLICY_BITFIELD32(TCA_DUMP_FLAGS_TERSE),
2723 /* called with RTNL */
2724 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
2726 struct tcf_chain *chain, *chain_prev;
2727 struct net *net = sock_net(skb->sk);
2728 struct nlattr *tca[TCA_MAX + 1];
2729 struct Qdisc *q = NULL;
2730 struct tcf_block *block;
2731 struct tcmsg *tcm = nlmsg_data(cb->nlh);
2732 bool terse_dump = false;
2738 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
2741 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
2742 tcf_tfilter_dump_policy, cb->extack);
2746 if (tca[TCA_DUMP_FLAGS]) {
2747 struct nla_bitfield32 flags =
2748 nla_get_bitfield32(tca[TCA_DUMP_FLAGS]);
2750 terse_dump = flags.value & TCA_DUMP_FLAGS_TERSE;
2753 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
2754 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
2757 /* If we work with block index, q is NULL and parent value
2758 * will never be used in the following code. The check
2759 * in tcf_fill_node prevents it. However, compiler does not
2760 * see that far, so set parent to zero to silence the warning
2761 * about parent being uninitialized.
2765 const struct Qdisc_class_ops *cops;
2766 struct net_device *dev;
2767 unsigned long cl = 0;
2769 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
2773 parent = tcm->tcm_parent;
2775 q = rtnl_dereference(dev->qdisc);
2777 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
2780 cops = q->ops->cl_ops;
2783 if (!cops->tcf_block)
2785 if (TC_H_MIN(tcm->tcm_parent)) {
2786 cl = cops->find(q, tcm->tcm_parent);
2790 block = cops->tcf_block(q, cl, NULL);
2793 parent = block->classid;
2794 if (tcf_block_shared(block))
2798 index_start = cb->args[0];
2801 for (chain = __tcf_get_next_chain(block, NULL);
2804 chain = __tcf_get_next_chain(block, chain),
2805 tcf_chain_put(chain_prev)) {
2806 if (tca[TCA_CHAIN] &&
2807 nla_get_u32(tca[TCA_CHAIN]) != chain->index)
2809 if (!tcf_chain_dump(chain, q, parent, skb, cb,
2810 index_start, &index, terse_dump)) {
2811 tcf_chain_put(chain);
2817 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
2818 tcf_block_refcnt_put(block, true);
2819 cb->args[0] = index;
2822 /* If we did no progress, the error (EMSGSIZE) is real */
2823 if (skb->len == 0 && err)
2828 static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops,
2829 void *tmplt_priv, u32 chain_index,
2830 struct net *net, struct sk_buff *skb,
2831 struct tcf_block *block,
2832 u32 portid, u32 seq, u16 flags, int event,
2833 struct netlink_ext_ack *extack)
2835 unsigned char *b = skb_tail_pointer(skb);
2836 const struct tcf_proto_ops *ops;
2837 struct nlmsghdr *nlh;
2844 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
2846 goto out_nlmsg_trim;
2847 tcm = nlmsg_data(nlh);
2848 tcm->tcm_family = AF_UNSPEC;
2851 tcm->tcm_handle = 0;
2853 tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex;
2854 tcm->tcm_parent = block->q->handle;
2856 tcm->tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
2857 tcm->tcm_block_index = block->index;
2860 if (nla_put_u32(skb, TCA_CHAIN, chain_index))
2861 goto nla_put_failure;
2864 if (nla_put_string(skb, TCA_KIND, ops->kind))
2865 goto nla_put_failure;
2866 if (ops->tmplt_dump(skb, net, priv) < 0)
2867 goto nla_put_failure;
2870 if (extack && extack->_msg &&
2871 nla_put_string(skb, TCA_EXT_WARN_MSG, extack->_msg))
2872 goto out_nlmsg_trim;
2874 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2884 static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
2885 u32 seq, u16 flags, int event, bool unicast,
2886 struct netlink_ext_ack *extack)
2888 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2889 struct tcf_block *block = chain->block;
2890 struct net *net = block->net;
2891 struct sk_buff *skb;
2894 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2898 if (tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
2899 chain->index, net, skb, block, portid,
2900 seq, flags, event, extack) <= 0) {
2906 err = rtnl_unicast(skb, net, portid);
2908 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
2909 flags & NLM_F_ECHO);
2914 static int tc_chain_notify_delete(const struct tcf_proto_ops *tmplt_ops,
2915 void *tmplt_priv, u32 chain_index,
2916 struct tcf_block *block, struct sk_buff *oskb,
2917 u32 seq, u16 flags, bool unicast)
2919 u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
2920 struct net *net = block->net;
2921 struct sk_buff *skb;
2923 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2927 if (tc_chain_fill_node(tmplt_ops, tmplt_priv, chain_index, net, skb,
2928 block, portid, seq, flags, RTM_DELCHAIN, NULL) <= 0) {
2934 return rtnl_unicast(skb, net, portid);
2936 return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
2939 static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
2940 struct nlattr **tca,
2941 struct netlink_ext_ack *extack)
2943 const struct tcf_proto_ops *ops;
2944 char name[IFNAMSIZ];
2947 /* If kind is not set, user did not specify template. */
2951 if (tcf_proto_check_kind(tca[TCA_KIND], name)) {
2952 NL_SET_ERR_MSG(extack, "Specified TC chain template name too long");
2956 ops = tcf_proto_lookup_ops(name, true, extack);
2958 return PTR_ERR(ops);
2959 if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump ||
2960 !ops->tmplt_reoffload) {
2961 NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
2962 module_put(ops->owner);
2966 tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
2967 if (IS_ERR(tmplt_priv)) {
2968 module_put(ops->owner);
2969 return PTR_ERR(tmplt_priv);
2971 chain->tmplt_ops = ops;
2972 chain->tmplt_priv = tmplt_priv;
2976 static void tc_chain_tmplt_del(const struct tcf_proto_ops *tmplt_ops,
2979 /* If template ops are set, no work to do for us. */
2983 tmplt_ops->tmplt_destroy(tmplt_priv);
2984 module_put(tmplt_ops->owner);
2987 /* Add/delete/get a chain */
2989 static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
2990 struct netlink_ext_ack *extack)
2992 struct net *net = sock_net(skb->sk);
2993 struct nlattr *tca[TCA_MAX + 1];
2998 struct tcf_chain *chain;
2999 struct tcf_block *block;
3005 err = nlmsg_parse_deprecated(n, sizeof(*t), tca, TCA_MAX,
3006 rtm_tca_policy, extack);
3011 parent = t->tcm_parent;
3014 block = tcf_block_find(net, &q, &parent, &cl,
3015 t->tcm_ifindex, t->tcm_block_index, extack);
3017 return PTR_ERR(block);
3019 chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
3020 if (chain_index > TC_ACT_EXT_VAL_MASK) {
3021 NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
3026 mutex_lock(&block->lock);
3027 chain = tcf_chain_lookup(block, chain_index);
3028 if (n->nlmsg_type == RTM_NEWCHAIN) {
3030 if (tcf_chain_held_by_acts_only(chain)) {
3031 /* The chain exists only because there is
3032 * some action referencing it.
3034 tcf_chain_hold(chain);
3036 NL_SET_ERR_MSG(extack, "Filter chain already exists");
3038 goto errout_block_locked;
3041 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
3042 NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
3044 goto errout_block_locked;
3046 chain = tcf_chain_create(block, chain_index);
3048 NL_SET_ERR_MSG(extack, "Failed to create filter chain");
3050 goto errout_block_locked;
3054 if (!chain || tcf_chain_held_by_acts_only(chain)) {
3055 NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
3057 goto errout_block_locked;
3059 tcf_chain_hold(chain);
3062 if (n->nlmsg_type == RTM_NEWCHAIN) {
3063 /* Modifying chain requires holding parent block lock. In case
3064 * the chain was successfully added, take a reference to the
3065 * chain. This ensures that an empty chain does not disappear at
3066 * the end of this function.
3068 tcf_chain_hold(chain);
3069 chain->explicitly_created = true;
3071 mutex_unlock(&block->lock);
3073 switch (n->nlmsg_type) {
3075 err = tc_chain_tmplt_add(chain, net, tca, extack);
3077 tcf_chain_put_explicitly_created(chain);
3081 tc_chain_notify(chain, NULL, 0, NLM_F_CREATE | NLM_F_EXCL,
3082 RTM_NEWCHAIN, false, extack);
3085 tfilter_notify_chain(net, skb, block, q, parent, n,
3086 chain, RTM_DELTFILTER, extack);
3087 /* Flush the chain first as the user requested chain removal. */
3088 tcf_chain_flush(chain, true);
3089 /* In case the chain was successfully deleted, put a reference
3090 * to the chain previously taken during addition.
3092 tcf_chain_put_explicitly_created(chain);
3095 err = tc_chain_notify(chain, skb, n->nlmsg_seq,
3096 n->nlmsg_flags, n->nlmsg_type, true, extack);
3098 NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
3102 NL_SET_ERR_MSG(extack, "Unsupported message type");
3107 tcf_chain_put(chain);
3109 tcf_block_release(q, block, true);
3111 /* Replay the request. */
3115 errout_block_locked:
3116 mutex_unlock(&block->lock);
3120 /* called with RTNL */
3121 static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
3123 struct net *net = sock_net(skb->sk);
3124 struct nlattr *tca[TCA_MAX + 1];
3125 struct Qdisc *q = NULL;
3126 struct tcf_block *block;
3127 struct tcmsg *tcm = nlmsg_data(cb->nlh);
3128 struct tcf_chain *chain;
3133 if (nlmsg_len(cb->nlh) < sizeof(*tcm))
3136 err = nlmsg_parse_deprecated(cb->nlh, sizeof(*tcm), tca, TCA_MAX,
3137 rtm_tca_policy, cb->extack);
3141 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
3142 block = tcf_block_refcnt_get(net, tcm->tcm_block_index);
3146 const struct Qdisc_class_ops *cops;
3147 struct net_device *dev;
3148 unsigned long cl = 0;
3150 dev = __dev_get_by_index(net, tcm->tcm_ifindex);
3154 if (!tcm->tcm_parent)
3155 q = rtnl_dereference(dev->qdisc);
3157 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
3161 cops = q->ops->cl_ops;
3164 if (!cops->tcf_block)
3166 if (TC_H_MIN(tcm->tcm_parent)) {
3167 cl = cops->find(q, tcm->tcm_parent);
3171 block = cops->tcf_block(q, cl, NULL);
3174 if (tcf_block_shared(block))
3178 index_start = cb->args[0];
3181 mutex_lock(&block->lock);
3182 list_for_each_entry(chain, &block->chain_list, list) {
3183 if ((tca[TCA_CHAIN] &&
3184 nla_get_u32(tca[TCA_CHAIN]) != chain->index))
3186 if (index < index_start) {
3190 if (tcf_chain_held_by_acts_only(chain))
3192 err = tc_chain_fill_node(chain->tmplt_ops, chain->tmplt_priv,
3193 chain->index, net, skb, block,
3194 NETLINK_CB(cb->skb).portid,
3195 cb->nlh->nlmsg_seq, NLM_F_MULTI,
3196 RTM_NEWCHAIN, NULL);
3201 mutex_unlock(&block->lock);
3203 if (tcm->tcm_ifindex == TCM_IFINDEX_MAGIC_BLOCK)
3204 tcf_block_refcnt_put(block, true);
3205 cb->args[0] = index;
3208 /* If we did no progress, the error (EMSGSIZE) is real */
3209 if (skb->len == 0 && err)
3214 int tcf_exts_init_ex(struct tcf_exts *exts, struct net *net, int action,
3215 int police, struct tcf_proto *tp, u32 handle,
3216 bool use_action_miss)
3220 #ifdef CONFIG_NET_CLS_ACT
3222 exts->nr_actions = 0;
3223 exts->miss_cookie_node = NULL;
3224 /* Note: we do not own yet a reference on net.
3225 * This reference might be taken later from tcf_exts_get_net().
3228 exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),
3234 exts->action = action;
3235 exts->police = police;
3237 if (!use_action_miss)
3240 err = tcf_exts_miss_cookie_base_alloc(exts, tp, handle);
3242 goto err_miss_alloc;
3247 tcf_exts_destroy(exts);
3248 #ifdef CONFIG_NET_CLS_ACT
3249 exts->actions = NULL;
3253 EXPORT_SYMBOL(tcf_exts_init_ex);
3255 void tcf_exts_destroy(struct tcf_exts *exts)
3257 tcf_exts_miss_cookie_base_destroy(exts);
3259 #ifdef CONFIG_NET_CLS_ACT
3260 if (exts->actions) {
3261 tcf_action_destroy(exts->actions, TCA_ACT_UNBIND);
3262 kfree(exts->actions);
3264 exts->nr_actions = 0;
3267 EXPORT_SYMBOL(tcf_exts_destroy);
3269 int tcf_exts_validate_ex(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3270 struct nlattr *rate_tlv, struct tcf_exts *exts,
3271 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack)
3273 #ifdef CONFIG_NET_CLS_ACT
3275 int init_res[TCA_ACT_MAX_PRIO] = {};
3276 struct tc_action *act;
3277 size_t attr_size = 0;
3279 if (exts->police && tb[exts->police]) {
3280 struct tc_action_ops *a_o;
3282 a_o = tc_action_load_ops(tb[exts->police], true,
3283 !(flags & TCA_ACT_FLAGS_NO_RTNL),
3286 return PTR_ERR(a_o);
3287 flags |= TCA_ACT_FLAGS_POLICE | TCA_ACT_FLAGS_BIND;
3288 act = tcf_action_init_1(net, tp, tb[exts->police],
3289 rate_tlv, a_o, init_res, flags,
3291 module_put(a_o->owner);
3293 return PTR_ERR(act);
3295 act->type = exts->type = TCA_OLD_COMPAT;
3296 exts->actions[0] = act;
3297 exts->nr_actions = 1;
3298 tcf_idr_insert_many(exts->actions);
3299 } else if (exts->action && tb[exts->action]) {
3302 flags |= TCA_ACT_FLAGS_BIND;
3303 err = tcf_action_init(net, tp, tb[exts->action],
3304 rate_tlv, exts->actions, init_res,
3305 &attr_size, flags, fl_flags,
3309 exts->nr_actions = err;
3313 if ((exts->action && tb[exts->action]) ||
3314 (exts->police && tb[exts->police])) {
3315 NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
3322 EXPORT_SYMBOL(tcf_exts_validate_ex);
3324 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
3325 struct nlattr *rate_tlv, struct tcf_exts *exts,
3326 u32 flags, struct netlink_ext_ack *extack)
3328 return tcf_exts_validate_ex(net, tp, tb, rate_tlv, exts,
3331 EXPORT_SYMBOL(tcf_exts_validate);
3333 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src)
3335 #ifdef CONFIG_NET_CLS_ACT
3336 struct tcf_exts old = *dst;
3339 tcf_exts_destroy(&old);
3342 EXPORT_SYMBOL(tcf_exts_change);
3344 #ifdef CONFIG_NET_CLS_ACT
3345 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
3347 if (exts->nr_actions == 0)
3350 return exts->actions[0];
3354 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
3356 #ifdef CONFIG_NET_CLS_ACT
3357 struct nlattr *nest;
3359 if (exts->action && tcf_exts_has_actions(exts)) {
3361 * again for backward compatible mode - we want
3362 * to work with both old and new modes of entering
3363 * tc data even if iproute2 was newer - jhs
3365 if (exts->type != TCA_OLD_COMPAT) {
3366 nest = nla_nest_start_noflag(skb, exts->action);
3368 goto nla_put_failure;
3370 if (tcf_action_dump(skb, exts->actions, 0, 0, false)
3372 goto nla_put_failure;
3373 nla_nest_end(skb, nest);
3374 } else if (exts->police) {
3375 struct tc_action *act = tcf_exts_first_act(exts);
3376 nest = nla_nest_start_noflag(skb, exts->police);
3377 if (nest == NULL || !act)
3378 goto nla_put_failure;
3379 if (tcf_action_dump_old(skb, act, 0, 0) < 0)
3380 goto nla_put_failure;
3381 nla_nest_end(skb, nest);
3387 nla_nest_cancel(skb, nest);
3393 EXPORT_SYMBOL(tcf_exts_dump);
3395 int tcf_exts_terse_dump(struct sk_buff *skb, struct tcf_exts *exts)
3397 #ifdef CONFIG_NET_CLS_ACT
3398 struct nlattr *nest;
3400 if (!exts->action || !tcf_exts_has_actions(exts))
3403 nest = nla_nest_start_noflag(skb, exts->action);
3405 goto nla_put_failure;
3407 if (tcf_action_dump(skb, exts->actions, 0, 0, true) < 0)
3408 goto nla_put_failure;
3409 nla_nest_end(skb, nest);
3413 nla_nest_cancel(skb, nest);
3419 EXPORT_SYMBOL(tcf_exts_terse_dump);
3421 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
3423 #ifdef CONFIG_NET_CLS_ACT
3424 struct tc_action *a = tcf_exts_first_act(exts);
3425 if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
3430 EXPORT_SYMBOL(tcf_exts_dump_stats);
3432 static void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
3434 if (*flags & TCA_CLS_FLAGS_IN_HW)
3436 *flags |= TCA_CLS_FLAGS_IN_HW;
3437 atomic_inc(&block->offloadcnt);
3440 static void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
3442 if (!(*flags & TCA_CLS_FLAGS_IN_HW))
3444 *flags &= ~TCA_CLS_FLAGS_IN_HW;
3445 atomic_dec(&block->offloadcnt);
3448 static void tc_cls_offload_cnt_update(struct tcf_block *block,
3449 struct tcf_proto *tp, u32 *cnt,
3450 u32 *flags, u32 diff, bool add)
3452 lockdep_assert_held(&block->cb_lock);
3454 spin_lock(&tp->lock);
3457 tcf_block_offload_inc(block, flags);
3462 tcf_block_offload_dec(block, flags);
3464 spin_unlock(&tp->lock);
3468 tc_cls_offload_cnt_reset(struct tcf_block *block, struct tcf_proto *tp,
3469 u32 *cnt, u32 *flags)
3471 lockdep_assert_held(&block->cb_lock);
3473 spin_lock(&tp->lock);
3474 tcf_block_offload_dec(block, flags);
3476 spin_unlock(&tp->lock);
3480 __tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3481 void *type_data, bool err_stop)
3483 struct flow_block_cb *block_cb;
3487 list_for_each_entry(block_cb, &block->flow_block.cb_list, list) {
3488 err = block_cb->cb(type, type_data, block_cb->cb_priv);
3499 int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
3500 void *type_data, bool err_stop, bool rtnl_held)
3502 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3508 down_read(&block->cb_lock);
3509 /* Need to obtain rtnl lock if block is bound to devs that require it.
3510 * In block bind code cb_lock is obtained while holding rtnl, so we must
3511 * obtain the locks in same order here.
3513 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3514 up_read(&block->cb_lock);
3519 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3521 up_read(&block->cb_lock);
3526 EXPORT_SYMBOL(tc_setup_cb_call);
3528 /* Non-destructive filter add. If filter that wasn't already in hardware is
3529 * successfully offloaded, increment block offloads counter. On failure,
3530 * previously offloaded filter is considered to be intact and offloads counter
3531 * is not decremented.
3534 int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
3535 enum tc_setup_type type, void *type_data, bool err_stop,
3536 u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
3538 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3544 down_read(&block->cb_lock);
3545 /* Need to obtain rtnl lock if block is bound to devs that require it.
3546 * In block bind code cb_lock is obtained while holding rtnl, so we must
3547 * obtain the locks in same order here.
3549 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3550 up_read(&block->cb_lock);
3555 /* Make sure all netdevs sharing this block are offload-capable. */
3556 if (block->nooffloaddevcnt && err_stop) {
3557 ok_count = -EOPNOTSUPP;
3561 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3565 if (tp->ops->hw_add)
3566 tp->ops->hw_add(tp, type_data);
3568 tc_cls_offload_cnt_update(block, tp, in_hw_count, flags,
3571 up_read(&block->cb_lock);
3574 return min(ok_count, 0);
3576 EXPORT_SYMBOL(tc_setup_cb_add);
3578 /* Destructive filter replace. If filter that wasn't already in hardware is
3579 * successfully offloaded, increment block offload counter. On failure,
3580 * previously offloaded filter is considered to be destroyed and offload counter
3584 int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp,
3585 enum tc_setup_type type, void *type_data, bool err_stop,
3586 u32 *old_flags, unsigned int *old_in_hw_count,
3587 u32 *new_flags, unsigned int *new_in_hw_count,
3590 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3596 down_read(&block->cb_lock);
3597 /* Need to obtain rtnl lock if block is bound to devs that require it.
3598 * In block bind code cb_lock is obtained while holding rtnl, so we must
3599 * obtain the locks in same order here.
3601 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3602 up_read(&block->cb_lock);
3607 /* Make sure all netdevs sharing this block are offload-capable. */
3608 if (block->nooffloaddevcnt && err_stop) {
3609 ok_count = -EOPNOTSUPP;
3613 tc_cls_offload_cnt_reset(block, tp, old_in_hw_count, old_flags);
3614 if (tp->ops->hw_del)
3615 tp->ops->hw_del(tp, type_data);
3617 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3621 if (tp->ops->hw_add)
3622 tp->ops->hw_add(tp, type_data);
3624 tc_cls_offload_cnt_update(block, tp, new_in_hw_count,
3625 new_flags, ok_count, true);
3627 up_read(&block->cb_lock);
3630 return min(ok_count, 0);
3632 EXPORT_SYMBOL(tc_setup_cb_replace);
3634 /* Destroy filter and decrement block offload counter, if filter was previously
3638 int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp,
3639 enum tc_setup_type type, void *type_data, bool err_stop,
3640 u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
3642 bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
3648 down_read(&block->cb_lock);
3649 /* Need to obtain rtnl lock if block is bound to devs that require it.
3650 * In block bind code cb_lock is obtained while holding rtnl, so we must
3651 * obtain the locks in same order here.
3653 if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
3654 up_read(&block->cb_lock);
3659 ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
3661 tc_cls_offload_cnt_reset(block, tp, in_hw_count, flags);
3662 if (tp->ops->hw_del)
3663 tp->ops->hw_del(tp, type_data);
3665 up_read(&block->cb_lock);
3668 return min(ok_count, 0);
3670 EXPORT_SYMBOL(tc_setup_cb_destroy);
3672 int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp,
3673 bool add, flow_setup_cb_t *cb,
3674 enum tc_setup_type type, void *type_data,
3675 void *cb_priv, u32 *flags, unsigned int *in_hw_count)
3677 int err = cb(type, type_data, cb_priv);
3680 if (add && tc_skip_sw(*flags))
3683 tc_cls_offload_cnt_update(block, tp, in_hw_count, flags, 1,
3689 EXPORT_SYMBOL(tc_setup_cb_reoffload);
3691 static int tcf_act_get_user_cookie(struct flow_action_entry *entry,
3692 const struct tc_action *act)
3694 struct tc_cookie *user_cookie;
3698 user_cookie = rcu_dereference(act->user_cookie);
3700 entry->user_cookie = flow_action_cookie_create(user_cookie->data,
3703 if (!entry->user_cookie)
3710 static void tcf_act_put_user_cookie(struct flow_action_entry *entry)
3712 flow_action_cookie_destroy(entry->user_cookie);
3715 void tc_cleanup_offload_action(struct flow_action *flow_action)
3717 struct flow_action_entry *entry;
3720 flow_action_for_each(i, entry, flow_action) {
3721 tcf_act_put_user_cookie(entry);
3722 if (entry->destructor)
3723 entry->destructor(entry->destructor_priv);
3726 EXPORT_SYMBOL(tc_cleanup_offload_action);
3728 static int tc_setup_offload_act(struct tc_action *act,
3729 struct flow_action_entry *entry,
3731 struct netlink_ext_ack *extack)
3733 #ifdef CONFIG_NET_CLS_ACT
3734 if (act->ops->offload_act_setup) {
3735 return act->ops->offload_act_setup(act, entry, index_inc, true,
3738 NL_SET_ERR_MSG(extack, "Action does not support offload");
3746 int tc_setup_action(struct flow_action *flow_action,
3747 struct tc_action *actions[],
3748 u32 miss_cookie_base,
3749 struct netlink_ext_ack *extack)
3751 int i, j, k, index, err = 0;
3752 struct tc_action *act;
3754 BUILD_BUG_ON(TCA_ACT_HW_STATS_ANY != FLOW_ACTION_HW_STATS_ANY);
3755 BUILD_BUG_ON(TCA_ACT_HW_STATS_IMMEDIATE != FLOW_ACTION_HW_STATS_IMMEDIATE);
3756 BUILD_BUG_ON(TCA_ACT_HW_STATS_DELAYED != FLOW_ACTION_HW_STATS_DELAYED);
3762 tcf_act_for_each_action(i, act, actions) {
3763 struct flow_action_entry *entry;
3765 entry = &flow_action->entries[j];
3766 spin_lock_bh(&act->tcfa_lock);
3767 err = tcf_act_get_user_cookie(entry, act);
3769 goto err_out_locked;
3772 err = tc_setup_offload_act(act, entry, &index, extack);
3774 goto err_out_locked;
3776 for (k = 0; k < index ; k++) {
3777 entry[k].hw_stats = tc_act_hw_stats(act->hw_stats);
3778 entry[k].hw_index = act->tcfa_index;
3779 entry[k].cookie = (unsigned long)act;
3780 entry[k].miss_cookie =
3781 tcf_exts_miss_cookie_get(miss_cookie_base, i);
3786 spin_unlock_bh(&act->tcfa_lock);
3791 tc_cleanup_offload_action(flow_action);
3795 spin_unlock_bh(&act->tcfa_lock);
3799 int tc_setup_offload_action(struct flow_action *flow_action,
3800 const struct tcf_exts *exts,
3801 struct netlink_ext_ack *extack)
3803 #ifdef CONFIG_NET_CLS_ACT
3804 u32 miss_cookie_base;
3809 miss_cookie_base = exts->miss_cookie_node ?
3810 exts->miss_cookie_node->miss_cookie_base : 0;
3811 return tc_setup_action(flow_action, exts->actions, miss_cookie_base,
3817 EXPORT_SYMBOL(tc_setup_offload_action);
3819 unsigned int tcf_exts_num_actions(struct tcf_exts *exts)
3821 unsigned int num_acts = 0;
3822 struct tc_action *act;
3825 tcf_exts_for_each_action(i, act, exts) {
3826 if (is_tcf_pedit(act))
3827 num_acts += tcf_pedit_nkeys(act);
3833 EXPORT_SYMBOL(tcf_exts_num_actions);
3835 #ifdef CONFIG_NET_CLS_ACT
3836 static int tcf_qevent_parse_block_index(struct nlattr *block_index_attr,
3838 struct netlink_ext_ack *extack)
3840 *p_block_index = nla_get_u32(block_index_attr);
3841 if (!*p_block_index) {
3842 NL_SET_ERR_MSG(extack, "Block number may not be zero");
3849 int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch,
3850 enum flow_block_binder_type binder_type,
3851 struct nlattr *block_index_attr,
3852 struct netlink_ext_ack *extack)
3857 if (!block_index_attr)
3860 err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack);
3864 qe->info.binder_type = binder_type;
3865 qe->info.chain_head_change = tcf_chain_head_change_dflt;
3866 qe->info.chain_head_change_priv = &qe->filter_chain;
3867 qe->info.block_index = block_index;
3869 return tcf_block_get_ext(&qe->block, sch, &qe->info, extack);
3871 EXPORT_SYMBOL(tcf_qevent_init);
3873 void tcf_qevent_destroy(struct tcf_qevent *qe, struct Qdisc *sch)
3875 if (qe->info.block_index)
3876 tcf_block_put_ext(qe->block, sch, &qe->info);
3878 EXPORT_SYMBOL(tcf_qevent_destroy);
3880 int tcf_qevent_validate_change(struct tcf_qevent *qe, struct nlattr *block_index_attr,
3881 struct netlink_ext_ack *extack)
3886 if (!block_index_attr)
3889 err = tcf_qevent_parse_block_index(block_index_attr, &block_index, extack);
3893 /* Bounce newly-configured block or change in block. */
3894 if (block_index != qe->info.block_index) {
3895 NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
3901 EXPORT_SYMBOL(tcf_qevent_validate_change);
3903 struct sk_buff *tcf_qevent_handle(struct tcf_qevent *qe, struct Qdisc *sch, struct sk_buff *skb,
3904 struct sk_buff **to_free, int *ret)
3906 struct tcf_result cl_res;
3907 struct tcf_proto *fl;
3909 if (!qe->info.block_index)
3912 fl = rcu_dereference_bh(qe->filter_chain);
3914 switch (tcf_classify(skb, NULL, fl, &cl_res, false)) {
3916 qdisc_qstats_drop(sch);
3917 __qdisc_drop(skb, to_free);
3918 *ret = __NET_XMIT_BYPASS;
3923 __qdisc_drop(skb, to_free);
3924 *ret = __NET_XMIT_STOLEN;
3926 case TC_ACT_REDIRECT:
3927 skb_do_redirect(skb);
3928 *ret = __NET_XMIT_STOLEN;
3934 EXPORT_SYMBOL(tcf_qevent_handle);
3936 int tcf_qevent_dump(struct sk_buff *skb, int attr_name, struct tcf_qevent *qe)
3938 if (!qe->info.block_index)
3940 return nla_put_u32(skb, attr_name, qe->info.block_index);
3942 EXPORT_SYMBOL(tcf_qevent_dump);
3945 static __net_init int tcf_net_init(struct net *net)
3947 struct tcf_net *tn = net_generic(net, tcf_net_id);
3949 spin_lock_init(&tn->idr_lock);
3954 static void __net_exit tcf_net_exit(struct net *net)
3956 struct tcf_net *tn = net_generic(net, tcf_net_id);
3958 idr_destroy(&tn->idr);
3961 static struct pernet_operations tcf_net_ops = {
3962 .init = tcf_net_init,
3963 .exit = tcf_net_exit,
3965 .size = sizeof(struct tcf_net),
3968 static int __init tc_filter_init(void)
3972 tc_filter_wq = alloc_ordered_workqueue("tc_filter_workqueue", 0);
3976 err = register_pernet_subsys(&tcf_net_ops);
3978 goto err_register_pernet_subsys;
3980 xa_init_flags(&tcf_exts_miss_cookies_xa, XA_FLAGS_ALLOC1);
3982 rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_new_tfilter, NULL,
3983 RTNL_FLAG_DOIT_UNLOCKED);
3984 rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_del_tfilter, NULL,
3985 RTNL_FLAG_DOIT_UNLOCKED);
3986 rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_get_tfilter,
3987 tc_dump_tfilter, RTNL_FLAG_DOIT_UNLOCKED);
3988 rtnl_register(PF_UNSPEC, RTM_NEWCHAIN, tc_ctl_chain, NULL, 0);
3989 rtnl_register(PF_UNSPEC, RTM_DELCHAIN, tc_ctl_chain, NULL, 0);
3990 rtnl_register(PF_UNSPEC, RTM_GETCHAIN, tc_ctl_chain,
3995 err_register_pernet_subsys:
3996 destroy_workqueue(tc_filter_wq);
4000 subsys_initcall(tc_filter_init);