1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* net/sched/act_api.c Packet action API.
4	*
5	* Author: Jamal Hadi Salim
6	*/
7
8	#include <linux/types.h>
9	#include <linux/kernel.h>
10	#include <linux/string.h>
11	#include <linux/errno.h>
12	#include <linux/slab.h>
13	#include <linux/skbuff.h>
14	#include <linux/init.h>
15	#include <linux/kmod.h>
16	#include <linux/err.h>
17	#include <linux/module.h>
18	#include <net/net_namespace.h>
19	#include <net/sock.h>
20	#include <net/sch_generic.h>
21	#include <net/pkt_cls.h>
22	#include <net/tc_act/tc_pedit.h>
23	#include <net/act_api.h>
24	#include <net/netlink.h>
25	#include <net/flow_offload.h>
26	#include <net/tc_wrapper.h>
27
28	#ifdef CONFIG_INET
29	DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
30	EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
31	#endif
32
33	int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
34	{
35	#ifdef CONFIG_INET
36	if (static_branch_unlikely(&tcf_frag_xmit_count))
37	return sch_frag_xmit_hook(skb, xmit);
38	#endif
39
40	return xmit(skb);
41	}
42	EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
43
44	static void tcf_action_goto_chain_exec(const struct tc_action *a,
45	struct tcf_result *res)
46	{
47	const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
48
49	res->goto_tp = rcu_dereference_bh(chain->filter_chain);
50	}
51
52	static void tcf_free_cookie_rcu(struct rcu_head *p)
53	{
54	struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
55
56	kfree(objp: cookie->data);
57	kfree(objp: cookie);
58	}
59
60	static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
61	struct tc_cookie *new_cookie)
62	{
63	struct tc_cookie *old;
64
65	old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
66	if (old)
67	call_rcu(head: &old->rcu, func: tcf_free_cookie_rcu);
68	}
69
70	int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
71	struct tcf_chain **newchain,
72	struct netlink_ext_ack *extack)
73	{
74	int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
75	u32 chain_index;
76
77	if (!opcode)
78	ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
79	else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
80	ret = 0;
81	if (ret) {
82	NL_SET_ERR_MSG(extack, "invalid control action");
83	goto end;
84	}
85
86	if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
87	chain_index = action & TC_ACT_EXT_VAL_MASK;
88	if (!tp || !newchain) {
89	ret = -EINVAL;
90	NL_SET_ERR_MSG(extack,
91	"can't goto NULL proto/chain");
92	goto end;
93	}
94	*newchain = tcf_chain_get_by_act(block: tp->chain->block, chain_index);
95	if (!*newchain) {
96	ret = -ENOMEM;
97	NL_SET_ERR_MSG(extack,
98	"can't allocate goto_chain");
99	}
100	}
101	end:
102	return ret;
103	}
104	EXPORT_SYMBOL(tcf_action_check_ctrlact);
105
106	struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
107	struct tcf_chain *goto_chain)
108	{
109	a->tcfa_action = action;
110	goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
111	return goto_chain;
112	}
113	EXPORT_SYMBOL(tcf_action_set_ctrlact);
114
115	/* XXX: For standalone actions, we don't need a RCU grace period either, because
116	* actions are always connected to filters and filters are already destroyed in
117	* RCU callbacks, so after a RCU grace period actions are already disconnected
118	* from filters. Readers later can not find us.
119	*/
120	static void free_tcf(struct tc_action *p)
121	{
122	struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
123
124	free_percpu(pdata: p->cpu_bstats);
125	free_percpu(pdata: p->cpu_bstats_hw);
126	free_percpu(pdata: p->cpu_qstats);
127
128	tcf_set_action_cookie(old_cookie: &p->user_cookie, NULL);
129	if (chain)
130	tcf_chain_put_by_act(chain);
131
132	kfree(objp: p);
133	}
134
135	static void offload_action_hw_count_set(struct tc_action *act,
136	u32 hw_count)
137	{
138	act->in_hw_count = hw_count;
139	}
140
141	static void offload_action_hw_count_inc(struct tc_action *act,
142	u32 hw_count)
143	{
144	act->in_hw_count += hw_count;
145	}
146
147	static void offload_action_hw_count_dec(struct tc_action *act,
148	u32 hw_count)
149	{
150	act->in_hw_count = act->in_hw_count > hw_count ?
151	act->in_hw_count - hw_count : 0;
152	}
153
154	static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
155	{
156	if (is_tcf_pedit(a: act))
157	return tcf_pedit_nkeys(a: act);
158	else
159	return 1;
160	}
161
162	static bool tc_act_skip_hw(u32 flags)
163	{
164	return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
165	}
166
167	static bool tc_act_skip_sw(u32 flags)
168	{
169	return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
170	}
171
172	/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
173	static bool tc_act_flags_valid(u32 flags)
174	{
175	flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
176
177	return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
178	}
179
180	static int offload_action_init(struct flow_offload_action *fl_action,
181	struct tc_action *act,
182	enum offload_act_command cmd,
183	struct netlink_ext_ack *extack)
184	{
185	int err;
186
187	fl_action->extack = extack;
188	fl_action->command = cmd;
189	fl_action->index = act->tcfa_index;
190	fl_action->cookie = (unsigned long)act;
191
192	if (act->ops->offload_act_setup) {
193	spin_lock_bh(lock: &act->tcfa_lock);
194	err = act->ops->offload_act_setup(act, fl_action, NULL,
195	false, extack);
196	spin_unlock_bh(lock: &act->tcfa_lock);
197	return err;
198	}
199
200	return -EOPNOTSUPP;
201	}
202
203	static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
204	u32 *hw_count)
205	{
206	int err;
207
208	err = flow_indr_dev_setup_offload(NULL, NULL, type: TC_SETUP_ACT,
209	data: fl_act, NULL, NULL);
210	if (err < 0)
211	return err;
212
213	if (hw_count)
214	*hw_count = err;
215
216	return 0;
217	}
218
219	static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
220	u32 *hw_count,
221	flow_indr_block_bind_cb_t *cb,
222	void *cb_priv)
223	{
224	int err;
225
226	err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
227	if (err < 0)
228	return err;
229
230	if (hw_count)
231	*hw_count = 1;
232
233	return 0;
234	}
235
236	static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
237	u32 *hw_count,
238	flow_indr_block_bind_cb_t *cb,
239	void *cb_priv)
240	{
241	return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
242	cb, cb_priv) :
243	tcf_action_offload_cmd_ex(fl_act, hw_count);
244	}
245
246	static int tcf_action_offload_add_ex(struct tc_action *action,
247	struct netlink_ext_ack *extack,
248	flow_indr_block_bind_cb_t *cb,
249	void *cb_priv)
250	{
251	bool skip_sw = tc_act_skip_sw(flags: action->tcfa_flags);
252	struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
253	[0] = action,
254	};
255	struct flow_offload_action *fl_action;
256	u32 in_hw_count = 0;
257	int num, err = 0;
258
259	if (tc_act_skip_hw(flags: action->tcfa_flags))
260	return 0;
261
262	num = tcf_offload_act_num_actions_single(act: action);
263	fl_action = offload_action_alloc(num_actions: num);
264	if (!fl_action)
265	return -ENOMEM;
266
267	err = offload_action_init(fl_action, act: action, cmd: FLOW_ACT_REPLACE, extack);
268	if (err)
269	goto fl_err;
270
271	err = tc_setup_action(flow_action: &fl_action->action, actions, miss_cookie_base: 0, extack);
272	if (err) {
273	NL_SET_ERR_MSG_MOD(extack,
274	"Failed to setup tc actions for offload");
275	goto fl_err;
276	}
277
278	err = tcf_action_offload_cmd(fl_act: fl_action, hw_count: &in_hw_count, cb, cb_priv);
279	if (!err)
280	cb ? offload_action_hw_count_inc(act: action, hw_count: in_hw_count) :
281	offload_action_hw_count_set(act: action, hw_count: in_hw_count);
282
283	if (skip_sw && !tc_act_in_hw(act: action))
284	err = -EINVAL;
285
286	tc_cleanup_offload_action(flow_action: &fl_action->action);
287
288	fl_err:
289	kfree(objp: fl_action);
290
291	return err;
292	}
293
294	/* offload the tc action after it is inserted */
295	static int tcf_action_offload_add(struct tc_action *action,
296	struct netlink_ext_ack *extack)
297	{
298	return tcf_action_offload_add_ex(action, extack, NULL, NULL);
299	}
300
301	int tcf_action_update_hw_stats(struct tc_action *action)
302	{
303	struct flow_offload_action fl_act = {};
304	int err;
305
306	err = offload_action_init(fl_action: &fl_act, act: action, cmd: FLOW_ACT_STATS, NULL);
307	if (err)
308	return err;
309
310	err = tcf_action_offload_cmd(fl_act: &fl_act, NULL, NULL, NULL);
311	if (!err) {
312	preempt_disable();
313	tcf_action_stats_update(a: action, bytes: fl_act.stats.bytes,
314	packets: fl_act.stats.pkts,
315	drops: fl_act.stats.drops,
316	lastuse: fl_act.stats.lastused,
317	hw: true);
318	preempt_enable();
319	action->used_hw_stats = fl_act.stats.used_hw_stats;
320	action->used_hw_stats_valid = true;
321	} else {
322	return -EOPNOTSUPP;
323	}
324
325	return 0;
326	}
327	EXPORT_SYMBOL(tcf_action_update_hw_stats);
328
329	static int tcf_action_offload_del_ex(struct tc_action *action,
330	flow_indr_block_bind_cb_t *cb,
331	void *cb_priv)
332	{
333	struct flow_offload_action fl_act = {};
334	u32 in_hw_count = 0;
335	int err = 0;
336
337	if (!tc_act_in_hw(act: action))
338	return 0;
339
340	err = offload_action_init(fl_action: &fl_act, act: action, cmd: FLOW_ACT_DESTROY, NULL);
341	if (err)
342	return err;
343
344	err = tcf_action_offload_cmd(fl_act: &fl_act, hw_count: &in_hw_count, cb, cb_priv);
345	if (err < 0)
346	return err;
347
348	if (!cb && action->in_hw_count != in_hw_count)
349	return -EINVAL;
350
351	/* do not need to update hw state when deleting action */
352	if (cb && in_hw_count)
353	offload_action_hw_count_dec(act: action, hw_count: in_hw_count);
354
355	return 0;
356	}
357
358	static int tcf_action_offload_del(struct tc_action *action)
359	{
360	return tcf_action_offload_del_ex(action, NULL, NULL);
361	}
362
363	static void tcf_action_cleanup(struct tc_action *p)
364	{
365	tcf_action_offload_del(action: p);
366	if (p->ops->cleanup)
367	p->ops->cleanup(p);
368
369	gen_kill_estimator(ptr: &p->tcfa_rate_est);
370	free_tcf(p);
371	}
372
373	static int __tcf_action_put(struct tc_action *p, bool bind)
374	{
375	struct tcf_idrinfo *idrinfo = p->idrinfo;
376
377	if (refcount_dec_and_mutex_lock(r: &p->tcfa_refcnt, lock: &idrinfo->lock)) {
378	if (bind)
379	atomic_dec(v: &p->tcfa_bindcnt);
380	idr_remove(&idrinfo->action_idr, id: p->tcfa_index);
381	mutex_unlock(lock: &idrinfo->lock);
382
383	tcf_action_cleanup(p);
384	return 1;
385	}
386
387	if (bind)
388	atomic_dec(v: &p->tcfa_bindcnt);
389
390	return 0;
391	}
392
393	static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
394	{
395	int ret = 0;
396
397	/* Release with strict==1 and bind==0 is only called through act API
398	* interface (classifiers always bind). Only case when action with
399	* positive reference count and zero bind count can exist is when it was
400	* also created with act API (unbinding last classifier will destroy the
401	* action if it was created by classifier). So only case when bind count
402	* can be changed after initial check is when unbound action is
403	* destroyed by act API while classifier binds to action with same id
404	* concurrently. This result either creation of new action(same behavior
405	* as before), or reusing existing action if concurrent process
406	* increments reference count before action is deleted. Both scenarios
407	* are acceptable.
408	*/
409	if (p) {
410	if (!bind && strict && atomic_read(v: &p->tcfa_bindcnt) > 0)
411	return -EPERM;
412
413	if (__tcf_action_put(p, bind))
414	ret = ACT_P_DELETED;
415	}
416
417	return ret;
418	}
419
420	int tcf_idr_release(struct tc_action *a, bool bind)
421	{
422	const struct tc_action_ops *ops = a->ops;
423	int ret;
424
425	ret = __tcf_idr_release(p: a, bind, strict: false);
426	if (ret == ACT_P_DELETED)
427	module_put(module: ops->owner);
428	return ret;
429	}
430	EXPORT_SYMBOL(tcf_idr_release);
431
432	static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
433	{
434	struct tc_cookie *user_cookie;
435	u32 cookie_len = 0;
436
437	rcu_read_lock();
438	user_cookie = rcu_dereference(act->user_cookie);
439
440	if (user_cookie)
441	cookie_len = nla_total_size(payload: user_cookie->len);
442	rcu_read_unlock();
443
444	return nla_total_size(payload: 0) /* action number nested */
445	+ nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
446	+ cookie_len /* TCA_ACT_COOKIE */
447	+ nla_total_size(payload: sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
448	+ nla_total_size(payload: 0) /* TCA_ACT_STATS nested */
449	+ nla_total_size(payload: sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
450	/* TCA_STATS_BASIC */
451	+ nla_total_size_64bit(payload: sizeof(struct gnet_stats_basic))
452	/* TCA_STATS_PKT64 */
453	+ nla_total_size_64bit(payload: sizeof(u64))
454	/* TCA_STATS_QUEUE */
455	+ nla_total_size_64bit(payload: sizeof(struct gnet_stats_queue))
456	+ nla_total_size(payload: 0) /* TCA_ACT_OPTIONS nested */
457	+ nla_total_size(payload: sizeof(struct tcf_t)); /* TCA_GACT_TM */
458	}
459
460	static size_t tcf_action_full_attrs_size(size_t sz)
461	{
462	return NLMSG_HDRLEN /* struct nlmsghdr */
463	+ sizeof(struct tcamsg)
464	+ nla_total_size(payload: 0) /* TCA_ACT_TAB nested */
465	+ sz;
466	}
467
468	static size_t tcf_action_fill_size(const struct tc_action *act)
469	{
470	size_t sz = tcf_action_shared_attrs_size(act);
471
472	if (act->ops->get_fill_size)
473	return act->ops->get_fill_size(act) + sz;
474	return sz;
475	}
476
477	static int
478	tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
479	{
480	unsigned char *b = skb_tail_pointer(skb);
481	struct tc_cookie *cookie;
482
483	if (nla_put_string(skb, attrtype: TCA_ACT_KIND, str: a->ops->kind))
484	goto nla_put_failure;
485	if (tcf_action_copy_stats(skb, a, 0))
486	goto nla_put_failure;
487	if (from_act && nla_put_u32(skb, attrtype: TCA_ACT_INDEX, value: a->tcfa_index))
488	goto nla_put_failure;
489
490	rcu_read_lock();
491	cookie = rcu_dereference(a->user_cookie);
492	if (cookie) {
493	if (nla_put(skb, attrtype: TCA_ACT_COOKIE, attrlen: cookie->len, data: cookie->data)) {
494	rcu_read_unlock();
495	goto nla_put_failure;
496	}
497	}
498	rcu_read_unlock();
499
500	return 0;
501
502	nla_put_failure:
503	nlmsg_trim(skb, mark: b);
504	return -1;
505	}
506
507	static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
508	struct netlink_callback *cb)
509	{
510	int err = 0, index = -1, s_i = 0, n_i = 0;
511	u32 act_flags = cb->args[2];
512	unsigned long jiffy_since = cb->args[3];
513	struct nlattr *nest;
514	struct idr *idr = &idrinfo->action_idr;
515	struct tc_action *p;
516	unsigned long id = 1;
517	unsigned long tmp;
518
519	mutex_lock(&idrinfo->lock);
520
521	s_i = cb->args[0];
522
523	idr_for_each_entry_ul(idr, p, tmp, id) {
524	index++;
525	if (index < s_i)
526	continue;
527	if (IS_ERR(ptr: p))
528	continue;
529
530	if (jiffy_since &&
531	time_after(jiffy_since,
532	(unsigned long)p->tcfa_tm.lastuse))
533	continue;
534
535	tcf_action_update_hw_stats(p);
536
537	nest = nla_nest_start_noflag(skb, attrtype: n_i);
538	if (!nest) {
539	index--;
540	goto nla_put_failure;
541	}
542	err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
543	tcf_action_dump_terse(skb, a: p, from_act: true) :
544	tcf_action_dump_1(skb, a: p, 0, 0);
545	if (err < 0) {
546	index--;
547	nlmsg_trim(skb, mark: nest);
548	goto done;
549	}
550	nla_nest_end(skb, start: nest);
551	n_i++;
552	if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
553	n_i >= TCA_ACT_MAX_PRIO)
554	goto done;
555	}
556	done:
557	if (index >= 0)
558	cb->args[0] = index + 1;
559
560	mutex_unlock(lock: &idrinfo->lock);
561	if (n_i) {
562	if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
563	cb->args[1] = n_i;
564	}
565	return n_i;
566
567	nla_put_failure:
568	nla_nest_cancel(skb, start: nest);
569	goto done;
570	}
571
572	static int tcf_idr_release_unsafe(struct tc_action *p)
573	{
574	if (atomic_read(v: &p->tcfa_bindcnt) > 0)
575	return -EPERM;
576
577	if (refcount_dec_and_test(r: &p->tcfa_refcnt)) {
578	idr_remove(&p->idrinfo->action_idr, id: p->tcfa_index);
579	tcf_action_cleanup(p);
580	return ACT_P_DELETED;
581	}
582
583	return 0;
584	}
585
586	static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
587	const struct tc_action_ops *ops,
588	struct netlink_ext_ack *extack)
589	{
590	struct nlattr *nest;
591	int n_i = 0;
592	int ret = -EINVAL;
593	struct idr *idr = &idrinfo->action_idr;
594	struct tc_action *p;
595	unsigned long id = 1;
596	unsigned long tmp;
597
598	nest = nla_nest_start_noflag(skb, attrtype: 0);
599	if (nest == NULL)
600	goto nla_put_failure;
601	if (nla_put_string(skb, attrtype: TCA_ACT_KIND, str: ops->kind))
602	goto nla_put_failure;
603
604	ret = 0;
605	mutex_lock(&idrinfo->lock);
606	idr_for_each_entry_ul(idr, p, tmp, id) {
607	if (IS_ERR(ptr: p))
608	continue;
609	ret = tcf_idr_release_unsafe(p);
610	if (ret == ACT_P_DELETED)
611	module_put(module: ops->owner);
612	else if (ret < 0)
613	break;
614	n_i++;
615	}
616	mutex_unlock(lock: &idrinfo->lock);
617	if (ret < 0) {
618	if (n_i)
619	NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
620	else
621	goto nla_put_failure;
622	}
623
624	ret = nla_put_u32(skb, attrtype: TCA_FCNT, value: n_i);
625	if (ret)
626	goto nla_put_failure;
627	nla_nest_end(skb, start: nest);
628
629	return n_i;
630	nla_put_failure:
631	nla_nest_cancel(skb, start: nest);
632	return ret;
633	}
634
635	int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
636	struct netlink_callback *cb, int type,
637	const struct tc_action_ops *ops,
638	struct netlink_ext_ack *extack)
639	{
640	struct tcf_idrinfo *idrinfo = tn->idrinfo;
641
642	if (type == RTM_DELACTION) {
643	return tcf_del_walker(idrinfo, skb, ops, extack);
644	} else if (type == RTM_GETACTION) {
645	return tcf_dump_walker(idrinfo, skb, cb);
646	} else {
647	WARN(1, "tcf_generic_walker: unknown command %d\n", type);
648	NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
649	return -EINVAL;
650	}
651	}
652	EXPORT_SYMBOL(tcf_generic_walker);
653
654	int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
655	{
656	struct tcf_idrinfo *idrinfo = tn->idrinfo;
657	struct tc_action *p;
658
659	mutex_lock(&idrinfo->lock);
660	p = idr_find(&idrinfo->action_idr, id: index);
661	if (IS_ERR(ptr: p))
662	p = NULL;
663	else if (p)
664	refcount_inc(r: &p->tcfa_refcnt);
665	mutex_unlock(lock: &idrinfo->lock);
666
667	if (p) {
668	*a = p;
669	return true;
670	}
671	return false;
672	}
673	EXPORT_SYMBOL(tcf_idr_search);
674
675	static int __tcf_generic_walker(struct net *net, struct sk_buff *skb,
676	struct netlink_callback *cb, int type,
677	const struct tc_action_ops *ops,
678	struct netlink_ext_ack *extack)
679	{
680	struct tc_action_net *tn = net_generic(net, id: ops->net_id);
681
682	if (unlikely(ops->walk))
683	return ops->walk(net, skb, cb, type, ops, extack);
684
685	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
686	}
687
688	static int __tcf_idr_search(struct net *net,
689	const struct tc_action_ops *ops,
690	struct tc_action **a, u32 index)
691	{
692	struct tc_action_net *tn = net_generic(net, id: ops->net_id);
693
694	if (unlikely(ops->lookup))
695	return ops->lookup(net, a, index);
696
697	return tcf_idr_search(tn, a, index);
698	}
699
700	static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
701	{
702	struct tc_action *p;
703	int ret = 0;
704
705	mutex_lock(&idrinfo->lock);
706	p = idr_find(&idrinfo->action_idr, id: index);
707	if (!p) {
708	mutex_unlock(lock: &idrinfo->lock);
709	return -ENOENT;
710	}
711
712	if (!atomic_read(v: &p->tcfa_bindcnt)) {
713	if (refcount_dec_and_test(r: &p->tcfa_refcnt)) {
714	struct module *owner = p->ops->owner;
715
716	WARN_ON(p != idr_remove(&idrinfo->action_idr,
717	p->tcfa_index));
718	mutex_unlock(lock: &idrinfo->lock);
719
720	tcf_action_cleanup(p);
721	module_put(module: owner);
722	return 0;
723	}
724	ret = 0;
725	} else {
726	ret = -EPERM;
727	}
728
729	mutex_unlock(lock: &idrinfo->lock);
730	return ret;
731	}
732
733	int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
734	struct tc_action **a, const struct tc_action_ops *ops,
735	int bind, bool cpustats, u32 flags)
736	{
737	struct tc_action *p = kzalloc(size: ops->size, GFP_KERNEL);
738	struct tcf_idrinfo *idrinfo = tn->idrinfo;
739	int err = -ENOMEM;
740
741	if (unlikely(!p))
742	return -ENOMEM;
743	refcount_set(r: &p->tcfa_refcnt, n: 1);
744	if (bind)
745	atomic_set(v: &p->tcfa_bindcnt, i: 1);
746
747	if (cpustats) {
748	p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
749	if (!p->cpu_bstats)
750	goto err1;
751	p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
752	if (!p->cpu_bstats_hw)
753	goto err2;
754	p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
755	if (!p->cpu_qstats)
756	goto err3;
757	}
758	gnet_stats_basic_sync_init(b: &p->tcfa_bstats);
759	gnet_stats_basic_sync_init(b: &p->tcfa_bstats_hw);
760	spin_lock_init(&p->tcfa_lock);
761	p->tcfa_index = index;
762	p->tcfa_tm.install = jiffies;
763	p->tcfa_tm.lastuse = jiffies;
764	p->tcfa_tm.firstuse = 0;
765	p->tcfa_flags = flags;
766	if (est) {
767	err = gen_new_estimator(bstats: &p->tcfa_bstats, cpu_bstats: p->cpu_bstats,
768	rate_est: &p->tcfa_rate_est,
769	lock: &p->tcfa_lock, running: false, opt: est);
770	if (err)
771	goto err4;
772	}
773
774	p->idrinfo = idrinfo;
775	__module_get(module: ops->owner);
776	p->ops = ops;
777	*a = p;
778	return 0;
779	err4:
780	free_percpu(pdata: p->cpu_qstats);
781	err3:
782	free_percpu(pdata: p->cpu_bstats_hw);
783	err2:
784	free_percpu(pdata: p->cpu_bstats);
785	err1:
786	kfree(objp: p);
787	return err;
788	}
789	EXPORT_SYMBOL(tcf_idr_create);
790
791	int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
792	struct nlattr *est, struct tc_action **a,
793	const struct tc_action_ops *ops, int bind,
794	u32 flags)
795	{
796	/* Set cpustats according to actions flags. */
797	return tcf_idr_create(tn, index, est, a, ops, bind,
798	!(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
799	}
800	EXPORT_SYMBOL(tcf_idr_create_from_flags);
801
802	/* Cleanup idr index that was allocated but not initialized. */
803
804	void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
805	{
806	struct tcf_idrinfo *idrinfo = tn->idrinfo;
807
808	mutex_lock(&idrinfo->lock);
809	/* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
810	WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
811	mutex_unlock(lock: &idrinfo->lock);
812	}
813	EXPORT_SYMBOL(tcf_idr_cleanup);
814
815	/* Check if action with specified index exists. If actions is found, increments
816	* its reference and bind counters, and return 1. Otherwise insert temporary
817	* error pointer (to prevent concurrent users from inserting actions with same
818	* index) and return 0.
819	*
820	* May return -EAGAIN for binding actions in case of a parallel add/delete on
821	* the requested index.
822	*/
823
824	int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
825	struct tc_action **a, int bind)
826	{
827	struct tcf_idrinfo *idrinfo = tn->idrinfo;
828	struct tc_action *p;
829	int ret;
830	u32 max;
831
832	if (*index) {
833	again:
834	rcu_read_lock();
835	p = idr_find(&idrinfo->action_idr, id: *index);
836
837	if (IS_ERR(ptr: p)) {
838	/* This means that another process allocated
839	* index but did not assign the pointer yet.
840	*/
841	rcu_read_unlock();
842	goto again;
843	}
844
845	if (!p) {
846	/* Empty slot, try to allocate it */
847	max = *index;
848	rcu_read_unlock();
849	goto new;
850	}
851
852	if (!refcount_inc_not_zero(r: &p->tcfa_refcnt)) {
853	/* Action was deleted in parallel */
854	rcu_read_unlock();
855	return -EAGAIN;
856	}
857
858	if (bind)
859	atomic_inc(v: &p->tcfa_bindcnt);
860	*a = p;
861
862	rcu_read_unlock();
863
864	return 1;
865	} else {
866	/* Find a slot */
867	*index = 1;
868	max = UINT_MAX;
869	}
870
871	new:
872	*a = NULL;
873
874	mutex_lock(&idrinfo->lock);
875	ret = idr_alloc_u32(&idrinfo->action_idr, ptr: ERR_PTR(error: -EBUSY), id: index, max,
876	GFP_KERNEL);
877	mutex_unlock(lock: &idrinfo->lock);
878
879	/* N binds raced for action allocation,
880	* retry for all the ones that failed.
881	*/
882	if (ret == -ENOSPC && *index == max)
883	ret = -EAGAIN;
884
885	return ret;
886	}
887	EXPORT_SYMBOL(tcf_idr_check_alloc);
888
889	void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
890	struct tcf_idrinfo *idrinfo)
891	{
892	struct idr *idr = &idrinfo->action_idr;
893	struct tc_action *p;
894	int ret;
895	unsigned long id = 1;
896	unsigned long tmp;
897
898	idr_for_each_entry_ul(idr, p, tmp, id) {
899	ret = __tcf_idr_release(p, bind: false, strict: true);
900	if (ret == ACT_P_DELETED)
901	module_put(module: ops->owner);
902	else if (ret < 0)
903	return;
904	}
905	idr_destroy(&idrinfo->action_idr);
906	}
907	EXPORT_SYMBOL(tcf_idrinfo_destroy);
908
909	static LIST_HEAD(act_base);
910	static DEFINE_RWLOCK(act_mod_lock);
911	/* since act ops id is stored in pernet subsystem list,
912	* then there is no way to walk through only all the action
913	* subsystem, so we keep tc action pernet ops id for
914	* reoffload to walk through.
915	*/
916	static LIST_HEAD(act_pernet_id_list);
917	static DEFINE_MUTEX(act_id_mutex);
918	struct tc_act_pernet_id {
919	struct list_head list;
920	unsigned int id;
921	};
922
923	static int tcf_pernet_add_id_list(unsigned int id)
924	{
925	struct tc_act_pernet_id *id_ptr;
926	int ret = 0;
927
928	mutex_lock(&act_id_mutex);
929	list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
930	if (id_ptr->id == id) {
931	ret = -EEXIST;
932	goto err_out;
933	}
934	}
935
936	id_ptr = kzalloc(size: sizeof(*id_ptr), GFP_KERNEL);
937	if (!id_ptr) {
938	ret = -ENOMEM;
939	goto err_out;
940	}
941	id_ptr->id = id;
942
943	list_add_tail(new: &id_ptr->list, head: &act_pernet_id_list);
944
945	err_out:
946	mutex_unlock(lock: &act_id_mutex);
947	return ret;
948	}
949
950	static void tcf_pernet_del_id_list(unsigned int id)
951	{
952	struct tc_act_pernet_id *id_ptr;
953
954	mutex_lock(&act_id_mutex);
955	list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
956	if (id_ptr->id == id) {
957	list_del(entry: &id_ptr->list);
958	kfree(objp: id_ptr);
959	break;
960	}
961	}
962	mutex_unlock(lock: &act_id_mutex);
963	}
964
965	int tcf_register_action(struct tc_action_ops *act,
966	struct pernet_operations *ops)
967	{
968	struct tc_action_ops *a;
969	int ret;
970
971	if (!act->act || !act->dump || !act->init)
972	return -EINVAL;
973
974	/* We have to register pernet ops before making the action ops visible,
975	* otherwise tcf_action_init_1() could get a partially initialized
976	* netns.
977	*/
978	ret = register_pernet_subsys(ops);
979	if (ret)
980	return ret;
981
982	if (ops->id) {
983	ret = tcf_pernet_add_id_list(id: *ops->id);
984	if (ret)
985	goto err_id;
986	}
987
988	write_lock(&act_mod_lock);
989	list_for_each_entry(a, &act_base, head) {
990	if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
991	ret = -EEXIST;
992	goto err_out;
993	}
994	}
995	list_add_tail(new: &act->head, head: &act_base);
996	write_unlock(&act_mod_lock);
997
998	return 0;
999
1000	err_out:
1001	write_unlock(&act_mod_lock);
1002	if (ops->id)
1003	tcf_pernet_del_id_list(id: *ops->id);
1004	err_id:
1005	unregister_pernet_subsys(ops);
1006	return ret;
1007	}
1008	EXPORT_SYMBOL(tcf_register_action);
1009
1010	int tcf_unregister_action(struct tc_action_ops *act,
1011	struct pernet_operations *ops)
1012	{
1013	struct tc_action_ops *a;
1014	int err = -ENOENT;
1015
1016	write_lock(&act_mod_lock);
1017	list_for_each_entry(a, &act_base, head) {
1018	if (a == act) {
1019	list_del(entry: &act->head);
1020	err = 0;
1021	break;
1022	}
1023	}
1024	write_unlock(&act_mod_lock);
1025	if (!err) {
1026	unregister_pernet_subsys(ops);
1027	if (ops->id)
1028	tcf_pernet_del_id_list(id: *ops->id);
1029	}
1030	return err;
1031	}
1032	EXPORT_SYMBOL(tcf_unregister_action);
1033
1034	/* lookup by name */
1035	static struct tc_action_ops *tc_lookup_action_n(char *kind)
1036	{
1037	struct tc_action_ops *a, *res = NULL;
1038
1039	if (kind) {
1040	read_lock(&act_mod_lock);
1041	list_for_each_entry(a, &act_base, head) {
1042	if (strcmp(kind, a->kind) == 0) {
1043	if (try_module_get(module: a->owner))
1044	res = a;
1045	break;
1046	}
1047	}
1048	read_unlock(&act_mod_lock);
1049	}
1050	return res;
1051	}
1052
1053	/* lookup by nlattr */
1054	static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1055	{
1056	struct tc_action_ops *a, *res = NULL;
1057
1058	if (kind) {
1059	read_lock(&act_mod_lock);
1060	list_for_each_entry(a, &act_base, head) {
1061	if (nla_strcmp(nla: kind, str: a->kind) == 0) {
1062	if (try_module_get(module: a->owner))
1063	res = a;
1064	break;
1065	}
1066	}
1067	read_unlock(&act_mod_lock);
1068	}
1069	return res;
1070	}
1071
1072	/*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1073	#define TCA_ACT_MAX_PRIO_MASK 0x1FF
1074	int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1075	int nr_actions, struct tcf_result *res)
1076	{
1077	u32 jmp_prgcnt = 0;
1078	u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1079	int i;
1080	int ret = TC_ACT_OK;
1081
1082	if (skb_skip_tc_classify(skb))
1083	return TC_ACT_OK;
1084
1085	restart_act_graph:
1086	for (i = 0; i < nr_actions; i++) {
1087	const struct tc_action *a = actions[i];
1088	int repeat_ttl;
1089
1090	if (jmp_prgcnt > 0) {
1091	jmp_prgcnt -= 1;
1092	continue;
1093	}
1094
1095	if (tc_act_skip_sw(flags: a->tcfa_flags))
1096	continue;
1097
1098	repeat_ttl = 32;
1099	repeat:
1100	ret = tc_act(skb, a, res);
1101	if (unlikely(ret == TC_ACT_REPEAT)) {
1102	if (--repeat_ttl != 0)
1103	goto repeat;
1104	/* suspicious opcode, stop pipeline */
1105	net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1106	return TC_ACT_OK;
1107	}
1108	if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1109	jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1110	if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1111	/* faulty opcode, stop pipeline */
1112	return TC_ACT_OK;
1113	} else {
1114	jmp_ttl -= 1;
1115	if (jmp_ttl > 0)
1116	goto restart_act_graph;
1117	else /* faulty graph, stop pipeline */
1118	return TC_ACT_OK;
1119	}
1120	} else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1121	if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1122	tcf_set_drop_reason(skb,
1123	reason: SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
1124	return TC_ACT_SHOT;
1125	}
1126	tcf_action_goto_chain_exec(a, res);
1127	}
1128
1129	if (ret != TC_ACT_PIPE)
1130	break;
1131	}
1132
1133	return ret;
1134	}
1135	EXPORT_SYMBOL(tcf_action_exec);
1136
1137	int tcf_action_destroy(struct tc_action *actions[], int bind)
1138	{
1139	const struct tc_action_ops *ops;
1140	struct tc_action *a;
1141	int ret = 0, i;
1142
1143	tcf_act_for_each_action(i, a, actions) {
1144	actions[i] = NULL;
1145	ops = a->ops;
1146	ret = __tcf_idr_release(p: a, bind, strict: true);
1147	if (ret == ACT_P_DELETED)
1148	module_put(module: ops->owner);
1149	else if (ret < 0)
1150	return ret;
1151	}
1152	return ret;
1153	}
1154
1155	static int tcf_action_put(struct tc_action *p)
1156	{
1157	return __tcf_action_put(p, bind: false);
1158	}
1159
1160	static void tcf_action_put_many(struct tc_action *actions[])
1161	{
1162	struct tc_action *a;
1163	int i;
1164
1165	tcf_act_for_each_action(i, a, actions) {
1166	const struct tc_action_ops *ops = a->ops;
1167	if (tcf_action_put(p: a))
1168	module_put(module: ops->owner);
1169	}
1170	}
1171
1172	static void tca_put_bound_many(struct tc_action *actions[], int init_res[])
1173	{
1174	struct tc_action *a;
1175	int i;
1176
1177	tcf_act_for_each_action(i, a, actions) {
1178	const struct tc_action_ops *ops = a->ops;
1179
1180	if (init_res[i] == ACT_P_CREATED)
1181	continue;
1182
1183	if (tcf_action_put(p: a))
1184	module_put(module: ops->owner);
1185	}
1186	}
1187
1188	int
1189	tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1190	{
1191	return a->ops->dump(skb, a, bind, ref);
1192	}
1193
1194	int
1195	tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1196	{
1197	int err = -EINVAL;
1198	unsigned char *b = skb_tail_pointer(skb);
1199	struct nlattr *nest;
1200	u32 flags;
1201
1202	if (tcf_action_dump_terse(skb, a, from_act: false))
1203	goto nla_put_failure;
1204
1205	if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
1206	nla_put_bitfield32(skb, attrtype: TCA_ACT_HW_STATS,
1207	value: a->hw_stats, TCA_ACT_HW_STATS_ANY))
1208	goto nla_put_failure;
1209
1210	if (a->used_hw_stats_valid &&
1211	nla_put_bitfield32(skb, attrtype: TCA_ACT_USED_HW_STATS,
1212	value: a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
1213	goto nla_put_failure;
1214
1215	flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
1216	if (flags &&
1217	nla_put_bitfield32(skb, attrtype: TCA_ACT_FLAGS,
1218	value: flags, selector: flags))
1219	goto nla_put_failure;
1220
1221	if (nla_put_u32(skb, attrtype: TCA_ACT_IN_HW_COUNT, value: a->in_hw_count))
1222	goto nla_put_failure;
1223
1224	nest = nla_nest_start_noflag(skb, attrtype: TCA_ACT_OPTIONS);
1225	if (nest == NULL)
1226	goto nla_put_failure;
1227	err = tcf_action_dump_old(skb, a, bind, ref);
1228	if (err > 0) {
1229	nla_nest_end(skb, start: nest);
1230	return err;
1231	}
1232
1233	nla_put_failure:
1234	nlmsg_trim(skb, mark: b);
1235	return -1;
1236	}
1237	EXPORT_SYMBOL(tcf_action_dump_1);
1238
1239	int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1240	int bind, int ref, bool terse)
1241	{
1242	struct tc_action *a;
1243	int err = -EINVAL, i;
1244	struct nlattr *nest;
1245
1246	tcf_act_for_each_action(i, a, actions) {
1247	nest = nla_nest_start_noflag(skb, attrtype: i + 1);
1248	if (nest == NULL)
1249	goto nla_put_failure;
1250	err = terse ? tcf_action_dump_terse(skb, a, from_act: false) :
1251	tcf_action_dump_1(skb, a, bind, ref);
1252	if (err < 0)
1253	goto errout;
1254	nla_nest_end(skb, start: nest);
1255	}
1256
1257	return 0;
1258
1259	nla_put_failure:
1260	err = -EINVAL;
1261	errout:
1262	nla_nest_cancel(skb, start: nest);
1263	return err;
1264	}
1265
1266	static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1267	{
1268	struct tc_cookie *c = kzalloc(size: sizeof(*c), GFP_KERNEL);
1269	if (!c)
1270	return NULL;
1271
1272	c->data = nla_memdup(src: tb[TCA_ACT_COOKIE], GFP_KERNEL);
1273	if (!c->data) {
1274	kfree(objp: c);
1275	return NULL;
1276	}
1277	c->len = nla_len(nla: tb[TCA_ACT_COOKIE]);
1278
1279	return c;
1280	}
1281
1282	static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1283	{
1284	struct nla_bitfield32 hw_stats_bf;
1285
1286	/* If the user did not pass the attr, that means he does
1287	* not care about the type. Return "any" in that case
1288	* which is setting on all supported types.
1289	*/
1290	if (!hw_stats_attr)
1291	return TCA_ACT_HW_STATS_ANY;
1292	hw_stats_bf = nla_get_bitfield32(nla: hw_stats_attr);
1293	return hw_stats_bf.value;
1294	}
1295
1296	static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1297	[TCA_ACT_KIND] = { .type = NLA_STRING },
1298	[TCA_ACT_INDEX] = { .type = NLA_U32 },
1299	[TCA_ACT_COOKIE] = { .type = NLA_BINARY,
1300	.len = TC_COOKIE_MAX_SIZE },
1301	[TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
1302	[TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1303	TCA_ACT_FLAGS_SKIP_HW |
1304	TCA_ACT_FLAGS_SKIP_SW),
1305	[TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1306	};
1307
1308	void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
1309	{
1310	struct tc_action *a;
1311	int i;
1312
1313	tcf_act_for_each_action(i, a, actions) {
1314	struct tcf_idrinfo *idrinfo;
1315
1316	if (init_res[i] == ACT_P_BOUND)
1317	continue;
1318
1319	idrinfo = a->idrinfo;
1320	mutex_lock(&idrinfo->lock);
1321	/* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
1322	idr_replace(&idrinfo->action_idr, a, id: a->tcfa_index);
1323	mutex_unlock(lock: &idrinfo->lock);
1324	}
1325	}
1326
1327	struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
1328	struct netlink_ext_ack *extack)
1329	{
1330	bool police = flags & TCA_ACT_FLAGS_POLICE;
1331	struct nlattr *tb[TCA_ACT_MAX + 1];
1332	struct tc_action_ops *a_o;
1333	char act_name[IFNAMSIZ];
1334	struct nlattr *kind;
1335	int err;
1336
1337	if (!police) {
1338	err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1339	policy: tcf_action_policy, extack);
1340	if (err < 0)
1341	return ERR_PTR(error: err);
1342	err = -EINVAL;
1343	kind = tb[TCA_ACT_KIND];
1344	if (!kind) {
1345	NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1346	return ERR_PTR(error: err);
1347	}
1348	if (nla_strscpy(dst: act_name, nla: kind, IFNAMSIZ) < 0) {
1349	NL_SET_ERR_MSG(extack, "TC action name too long");
1350	return ERR_PTR(error: err);
1351	}
1352	} else {
1353	if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
1354	NL_SET_ERR_MSG(extack, "TC action name too long");
1355	return ERR_PTR(error: -EINVAL);
1356	}
1357	}
1358
1359	a_o = tc_lookup_action_n(kind: act_name);
1360	if (a_o == NULL) {
1361	#ifdef CONFIG_MODULES
1362	bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL);
1363
1364	if (rtnl_held)
1365	rtnl_unlock();
1366	request_module(NET_ACT_ALIAS_PREFIX "%s", act_name);
1367	if (rtnl_held)
1368	rtnl_lock();
1369
1370	a_o = tc_lookup_action_n(kind: act_name);
1371
1372	/* We dropped the RTNL semaphore in order to
1373	* perform the module load. So, even if we
1374	* succeeded in loading the module we have to
1375	* tell the caller to replay the request. We
1376	* indicate this using -EAGAIN.
1377	*/
1378	if (a_o != NULL) {
1379	module_put(module: a_o->owner);
1380	return ERR_PTR(error: -EAGAIN);
1381	}
1382	#endif
1383	NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1384	return ERR_PTR(error: -ENOENT);
1385	}
1386
1387	return a_o;
1388	}
1389
1390	struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1391	struct nlattr *nla, struct nlattr *est,
1392	struct tc_action_ops *a_o, int *init_res,
1393	u32 flags, struct netlink_ext_ack *extack)
1394	{
1395	bool police = flags & TCA_ACT_FLAGS_POLICE;
1396	struct nla_bitfield32 userflags = { 0, 0 };
1397	struct tc_cookie *user_cookie = NULL;
1398	u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1399	struct nlattr *tb[TCA_ACT_MAX + 1];
1400	struct tc_action *a;
1401	int err;
1402
1403	/* backward compatibility for policer */
1404	if (!police) {
1405	err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1406	policy: tcf_action_policy, extack);
1407	if (err < 0)
1408	return ERR_PTR(error: err);
1409	if (tb[TCA_ACT_COOKIE]) {
1410	user_cookie = nla_memdup_cookie(tb);
1411	if (!user_cookie) {
1412	NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1413	err = -ENOMEM;
1414	goto err_out;
1415	}
1416	}
1417	hw_stats = tcf_action_hw_stats_get(hw_stats_attr: tb[TCA_ACT_HW_STATS]);
1418	if (tb[TCA_ACT_FLAGS]) {
1419	userflags = nla_get_bitfield32(nla: tb[TCA_ACT_FLAGS]);
1420	if (!tc_act_flags_valid(flags: userflags.value)) {
1421	err = -EINVAL;
1422	goto err_out;
1423	}
1424	}
1425
1426	err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1427	userflags.value | flags, extack);
1428	} else {
1429	err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1430	extack);
1431	}
1432	if (err < 0)
1433	goto err_out;
1434	*init_res = err;
1435
1436	if (!police && tb[TCA_ACT_COOKIE])
1437	tcf_set_action_cookie(old_cookie: &a->user_cookie, new_cookie: user_cookie);
1438
1439	if (!police)
1440	a->hw_stats = hw_stats;
1441
1442	return a;
1443
1444	err_out:
1445	if (user_cookie) {
1446	kfree(objp: user_cookie->data);
1447	kfree(objp: user_cookie);
1448	}
1449	return ERR_PTR(error: err);
1450	}
1451
1452	static bool tc_act_bind(u32 flags)
1453	{
1454	return !!(flags & TCA_ACT_FLAGS_BIND);
1455	}
1456
1457	/* Returns numbers of initialized actions or negative error. */
1458
1459	int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1460	struct nlattr *est, struct tc_action *actions[],
1461	int init_res[], size_t *attr_size,
1462	u32 flags, u32 fl_flags,
1463	struct netlink_ext_ack *extack)
1464	{
1465	struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1466	struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1467	struct tc_action *act;
1468	size_t sz = 0;
1469	int err;
1470	int i;
1471
1472	err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1473	extack);
1474	if (err < 0)
1475	return err;
1476
1477	for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1478	struct tc_action_ops *a_o;
1479
1480	a_o = tc_action_load_ops(nla: tb[i], flags, extack);
1481	if (IS_ERR(ptr: a_o)) {
1482	err = PTR_ERR(ptr: a_o);
1483	goto err_mod;
1484	}
1485	ops[i - 1] = a_o;
1486	}
1487
1488	for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1489	act = tcf_action_init_1(net, tp, nla: tb[i], est, a_o: ops[i - 1],
1490	init_res: &init_res[i - 1], flags, extack);
1491	if (IS_ERR(ptr: act)) {
1492	err = PTR_ERR(ptr: act);
1493	goto err;
1494	}
1495	sz += tcf_action_fill_size(act);
1496	/* Start from index 0 */
1497	actions[i - 1] = act;
1498	if (tc_act_bind(flags)) {
1499	bool skip_sw = tc_skip_sw(flags: fl_flags);
1500	bool skip_hw = tc_skip_hw(flags: fl_flags);
1501
1502	if (tc_act_bind(flags: act->tcfa_flags))
1503	continue;
1504	if (skip_sw != tc_act_skip_sw(flags: act->tcfa_flags) ||
1505	skip_hw != tc_act_skip_hw(flags: act->tcfa_flags)) {
1506	NL_SET_ERR_MSG(extack,
1507	"Mismatch between action and filter offload flags");
1508	err = -EINVAL;
1509	goto err;
1510	}
1511	} else {
1512	err = tcf_action_offload_add(action: act, extack);
1513	if (tc_act_skip_sw(flags: act->tcfa_flags) && err)
1514	goto err;
1515	}
1516	}
1517
1518	/* We have to commit them all together, because if any error happened in
1519	* between, we could not handle the failure gracefully.
1520	*/
1521	tcf_idr_insert_many(actions, init_res);
1522
1523	*attr_size = tcf_action_full_attrs_size(sz);
1524	err = i - 1;
1525	goto err_mod;
1526
1527	err:
1528	tcf_action_destroy(actions, bind: flags & TCA_ACT_FLAGS_BIND);
1529	err_mod:
1530	for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++)
1531	module_put(module: ops[i]->owner);
1532	return err;
1533	}
1534
1535	void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1536	u64 drops, bool hw)
1537	{
1538	if (a->cpu_bstats) {
1539	_bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1540
1541	this_cpu_ptr(a->cpu_qstats)->drops += drops;
1542
1543	if (hw)
1544	_bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1545	bytes, packets);
1546	return;
1547	}
1548
1549	_bstats_update(bstats: &a->tcfa_bstats, bytes, packets);
1550	a->tcfa_qstats.drops += drops;
1551	if (hw)
1552	_bstats_update(bstats: &a->tcfa_bstats_hw, bytes, packets);
1553	}
1554	EXPORT_SYMBOL(tcf_action_update_stats);
1555
1556	int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1557	int compat_mode)
1558	{
1559	int err = 0;
1560	struct gnet_dump d;
1561
1562	if (p == NULL)
1563	goto errout;
1564
1565	/* compat_mode being true specifies a call that is supposed
1566	* to add additional backward compatibility statistic TLVs.
1567	*/
1568	if (compat_mode) {
1569	if (p->type == TCA_OLD_COMPAT)
1570	err = gnet_stats_start_copy_compat(skb, type: 0,
1571	tc_stats_type: TCA_STATS,
1572	xstats_type: TCA_XSTATS,
1573	lock: &p->tcfa_lock, d: &d,
1574	padattr: TCA_PAD);
1575	else
1576	return 0;
1577	} else
1578	err = gnet_stats_start_copy(skb, type: TCA_ACT_STATS,
1579	lock: &p->tcfa_lock, d: &d, padattr: TCA_ACT_PAD);
1580
1581	if (err < 0)
1582	goto errout;
1583
1584	if (gnet_stats_copy_basic(d: &d, cpu: p->cpu_bstats,
1585	b: &p->tcfa_bstats, running: false) < 0 ||
1586	gnet_stats_copy_basic_hw(d: &d, cpu: p->cpu_bstats_hw,
1587	b: &p->tcfa_bstats_hw, running: false) < 0 ||
1588	gnet_stats_copy_rate_est(d: &d, ptr: &p->tcfa_rate_est) < 0 ||
1589	gnet_stats_copy_queue(d: &d, cpu_q: p->cpu_qstats,
1590	q: &p->tcfa_qstats,
1591	qlen: p->tcfa_qstats.qlen) < 0)
1592	goto errout;
1593
1594	if (gnet_stats_finish_copy(d: &d) < 0)
1595	goto errout;
1596
1597	return 0;
1598
1599	errout:
1600	return -1;
1601	}
1602
1603	static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1604	u32 portid, u32 seq, u16 flags, int event, int bind,
1605	int ref, struct netlink_ext_ack *extack)
1606	{
1607	struct tcamsg *t;
1608	struct nlmsghdr *nlh;
1609	unsigned char *b = skb_tail_pointer(skb);
1610	struct nlattr *nest;
1611
1612	nlh = nlmsg_put(skb, portid, seq, type: event, payload: sizeof(*t), flags);
1613	if (!nlh)
1614	goto out_nlmsg_trim;
1615	t = nlmsg_data(nlh);
1616	t->tca_family = AF_UNSPEC;
1617	t->tca__pad1 = 0;
1618	t->tca__pad2 = 0;
1619
1620	if (extack && extack->_msg &&
1621	nla_put_string(skb, attrtype: TCA_ROOT_EXT_WARN_MSG, str: extack->_msg))
1622	goto out_nlmsg_trim;
1623
1624	nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1625	if (!nest)
1626	goto out_nlmsg_trim;
1627
1628	if (tcf_action_dump(skb, actions, bind, ref, terse: false) < 0)
1629	goto out_nlmsg_trim;
1630
1631	nla_nest_end(skb, start: nest);
1632
1633	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1634
1635	return skb->len;
1636
1637	out_nlmsg_trim:
1638	nlmsg_trim(skb, mark: b);
1639	return -1;
1640	}
1641
1642	static int
1643	tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1644	struct tc_action *actions[], int event,
1645	struct netlink_ext_ack *extack)
1646	{
1647	struct sk_buff *skb;
1648
1649	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1650	if (!skb)
1651	return -ENOBUFS;
1652	if (tca_get_fill(skb, actions, portid, seq: n->nlmsg_seq, flags: 0, event,
1653	bind: 0, ref: 1, NULL) <= 0) {
1654	NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1655	kfree_skb(skb);
1656	return -EINVAL;
1657	}
1658
1659	return rtnl_unicast(skb, net, pid: portid);
1660	}
1661
1662	static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1663	struct nlmsghdr *n, u32 portid,
1664	struct netlink_ext_ack *extack)
1665	{
1666	struct nlattr *tb[TCA_ACT_MAX + 1];
1667	const struct tc_action_ops *ops;
1668	struct tc_action *a;
1669	int index;
1670	int err;
1671
1672	err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1673	policy: tcf_action_policy, extack);
1674	if (err < 0)
1675	goto err_out;
1676
1677	err = -EINVAL;
1678	if (tb[TCA_ACT_INDEX] == NULL ||
1679	nla_len(nla: tb[TCA_ACT_INDEX]) < sizeof(index)) {
1680	NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1681	goto err_out;
1682	}
1683	index = nla_get_u32(nla: tb[TCA_ACT_INDEX]);
1684
1685	err = -EINVAL;
1686	ops = tc_lookup_action(kind: tb[TCA_ACT_KIND]);
1687	if (!ops) { /* could happen in batch of actions */
1688	NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1689	goto err_out;
1690	}
1691	err = -ENOENT;
1692	if (__tcf_idr_search(net, ops, a: &a, index) == 0) {
1693	NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1694	goto err_mod;
1695	}
1696
1697	module_put(module: ops->owner);
1698	return a;
1699
1700	err_mod:
1701	module_put(module: ops->owner);
1702	err_out:
1703	return ERR_PTR(error: err);
1704	}
1705
1706	static int tca_action_flush(struct net *net, struct nlattr *nla,
1707	struct nlmsghdr *n, u32 portid,
1708	struct netlink_ext_ack *extack)
1709	{
1710	struct sk_buff *skb;
1711	unsigned char *b;
1712	struct nlmsghdr *nlh;
1713	struct tcamsg *t;
1714	struct netlink_callback dcb;
1715	struct nlattr *nest;
1716	struct nlattr *tb[TCA_ACT_MAX + 1];
1717	const struct tc_action_ops *ops;
1718	struct nlattr *kind;
1719	int err = -ENOMEM;
1720
1721	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1722	if (!skb)
1723	return err;
1724
1725	b = skb_tail_pointer(skb);
1726
1727	err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1728	policy: tcf_action_policy, extack);
1729	if (err < 0)
1730	goto err_out;
1731
1732	err = -EINVAL;
1733	kind = tb[TCA_ACT_KIND];
1734	ops = tc_lookup_action(kind);
1735	if (!ops) { /*some idjot trying to flush unknown action */
1736	NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1737	goto err_out;
1738	}
1739
1740	nlh = nlmsg_put(skb, portid, seq: n->nlmsg_seq, RTM_DELACTION,
1741	payload: sizeof(*t), flags: 0);
1742	if (!nlh) {
1743	NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1744	goto out_module_put;
1745	}
1746	t = nlmsg_data(nlh);
1747	t->tca_family = AF_UNSPEC;
1748	t->tca__pad1 = 0;
1749	t->tca__pad2 = 0;
1750
1751	nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1752	if (!nest) {
1753	NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1754	goto out_module_put;
1755	}
1756
1757	err = __tcf_generic_walker(net, skb, cb: &dcb, RTM_DELACTION, ops, extack);
1758	if (err <= 0) {
1759	nla_nest_cancel(skb, start: nest);
1760	goto out_module_put;
1761	}
1762
1763	nla_nest_end(skb, start: nest);
1764
1765	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1766	nlh->nlmsg_flags |= NLM_F_ROOT;
1767	module_put(module: ops->owner);
1768	err = rtnetlink_send(skb, net, pid: portid, RTNLGRP_TC,
1769	echo: n->nlmsg_flags & NLM_F_ECHO);
1770	if (err < 0)
1771	NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1772
1773	return err;
1774
1775	out_module_put:
1776	module_put(module: ops->owner);
1777	err_out:
1778	kfree_skb(skb);
1779	return err;
1780	}
1781
1782	static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1783	{
1784	struct tc_action *a;
1785	int i;
1786
1787	tcf_act_for_each_action(i, a, actions) {
1788	const struct tc_action_ops *ops = a->ops;
1789	/* Actions can be deleted concurrently so we must save their
1790	* type and id to search again after reference is released.
1791	*/
1792	struct tcf_idrinfo *idrinfo = a->idrinfo;
1793	u32 act_index = a->tcfa_index;
1794
1795	actions[i] = NULL;
1796	if (tcf_action_put(p: a)) {
1797	/* last reference, action was deleted concurrently */
1798	module_put(module: ops->owner);
1799	} else {
1800	int ret;
1801
1802	/* now do the delete */
1803	ret = tcf_idr_delete_index(idrinfo, index: act_index);
1804	if (ret < 0)
1805	return ret;
1806	}
1807	}
1808	return 0;
1809	}
1810
1811	static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net,
1812	struct tc_action *action)
1813	{
1814	size_t attr_size = tcf_action_fill_size(act: action);
1815	struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1816	[0] = action,
1817	};
1818	struct sk_buff *skb;
1819
1820	skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1821	if (!skb)
1822	return ERR_PTR(error: -ENOBUFS);
1823
1824	if (tca_get_fill(skb, actions, portid: 0, seq: 0, flags: 0, RTM_DELACTION, bind: 0, ref: 1, NULL) <= 0) {
1825	kfree_skb(skb);
1826	return ERR_PTR(error: -EINVAL);
1827	}
1828
1829	return skb;
1830	}
1831
1832	static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1833	{
1834	const struct tc_action_ops *ops = action->ops;
1835	struct sk_buff *skb;
1836	int ret;
1837
1838	if (!rtnl_notify_needed(net, nlflags: 0, RTNLGRP_TC)) {
1839	skb = NULL;
1840	} else {
1841	skb = tcf_reoffload_del_notify_msg(net, action);
1842	if (IS_ERR(ptr: skb))
1843	return PTR_ERR(ptr: skb);
1844	}
1845
1846	ret = tcf_idr_release_unsafe(p: action);
1847	if (ret == ACT_P_DELETED) {
1848	module_put(module: ops->owner);
1849	ret = rtnetlink_maybe_send(skb, net, pid: 0, RTNLGRP_TC, echo: 0);
1850	} else {
1851	kfree_skb(skb);
1852	}
1853
1854	return ret;
1855	}
1856
1857	int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1858	void *cb_priv, bool add)
1859	{
1860	struct tc_act_pernet_id *id_ptr;
1861	struct tcf_idrinfo *idrinfo;
1862	struct tc_action_net *tn;
1863	struct tc_action *p;
1864	unsigned int act_id;
1865	unsigned long tmp;
1866	unsigned long id;
1867	struct idr *idr;
1868	struct net *net;
1869	int ret;
1870
1871	if (!cb)
1872	return -EINVAL;
1873
1874	down_read(sem: &net_rwsem);
1875	mutex_lock(&act_id_mutex);
1876
1877	for_each_net(net) {
1878	list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1879	act_id = id_ptr->id;
1880	tn = net_generic(net, id: act_id);
1881	if (!tn)
1882	continue;
1883	idrinfo = tn->idrinfo;
1884	if (!idrinfo)
1885	continue;
1886
1887	mutex_lock(&idrinfo->lock);
1888	idr = &idrinfo->action_idr;
1889	idr_for_each_entry_ul(idr, p, tmp, id) {
1890	if (IS_ERR(ptr: p) || tc_act_bind(flags: p->tcfa_flags))
1891	continue;
1892	if (add) {
1893	tcf_action_offload_add_ex(action: p, NULL, cb,
1894	cb_priv);
1895	continue;
1896	}
1897
1898	/* cb unregister to update hw count */
1899	ret = tcf_action_offload_del_ex(action: p, cb, cb_priv);
1900	if (ret < 0)
1901	continue;
1902	if (tc_act_skip_sw(flags: p->tcfa_flags) &&
1903	!tc_act_in_hw(act: p))
1904	tcf_reoffload_del_notify(net, action: p);
1905	}
1906	mutex_unlock(lock: &idrinfo->lock);
1907	}
1908	}
1909	mutex_unlock(lock: &act_id_mutex);
1910	up_read(sem: &net_rwsem);
1911
1912	return 0;
1913	}
1914
1915	static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n,
1916	struct tc_action *actions[],
1917	u32 portid, size_t attr_size,
1918	struct netlink_ext_ack *extack)
1919	{
1920	struct sk_buff *skb;
1921
1922	skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1923	if (!skb)
1924	return ERR_PTR(error: -ENOBUFS);
1925
1926	if (tca_get_fill(skb, actions, portid, seq: n->nlmsg_seq, flags: 0, RTM_DELACTION,
1927	bind: 0, ref: 2, extack) <= 0) {
1928	NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1929	kfree_skb(skb);
1930	return ERR_PTR(error: -EINVAL);
1931	}
1932
1933	return skb;
1934	}
1935
1936	static int tcf_del_notify(struct net *net, struct nlmsghdr *n,
1937	struct tc_action *actions[], u32 portid,
1938	size_t attr_size, struct netlink_ext_ack *extack)
1939	{
1940	struct sk_buff *skb;
1941	int ret;
1942
1943	if (!rtnl_notify_needed(net, nlflags: n->nlmsg_flags, RTNLGRP_TC)) {
1944	skb = NULL;
1945	} else {
1946	skb = tcf_del_notify_msg(net, n, actions, portid, attr_size,
1947	extack);
1948	if (IS_ERR(ptr: skb))
1949	return PTR_ERR(ptr: skb);
1950	}
1951
1952	/* now do the delete */
1953	ret = tcf_action_delete(net, actions);
1954	if (ret < 0) {
1955	NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1956	kfree_skb(skb);
1957	return ret;
1958	}
1959
1960	return rtnetlink_maybe_send(skb, net, pid: portid, RTNLGRP_TC,
1961	echo: n->nlmsg_flags & NLM_F_ECHO);
1962	}
1963
1964	static int
1965	tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1966	u32 portid, int event, struct netlink_ext_ack *extack)
1967	{
1968	int i, ret;
1969	struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1970	struct tc_action *act;
1971	size_t attr_size = 0;
1972	struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1973
1974	ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1975	extack);
1976	if (ret < 0)
1977	return ret;
1978
1979	if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1980	if (tb[1])
1981	return tca_action_flush(net, nla: tb[1], n, portid, extack);
1982
1983	NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1984	return -EINVAL;
1985	}
1986
1987	for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1988	act = tcf_action_get_1(net, nla: tb[i], n, portid, extack);
1989	if (IS_ERR(ptr: act)) {
1990	ret = PTR_ERR(ptr: act);
1991	goto err;
1992	}
1993	attr_size += tcf_action_fill_size(act);
1994	actions[i - 1] = act;
1995	}
1996
1997	attr_size = tcf_action_full_attrs_size(sz: attr_size);
1998
1999	if (event == RTM_GETACTION)
2000	ret = tcf_get_notify(net, portid, n, actions, event, extack);
2001	else { /* delete */
2002	ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
2003	if (ret)
2004	goto err;
2005	return 0;
2006	}
2007	err:
2008	tcf_action_put_many(actions);
2009	return ret;
2010	}
2011
2012	static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n,
2013	struct tc_action *actions[],
2014	u32 portid, size_t attr_size,
2015	struct netlink_ext_ack *extack)
2016	{
2017	struct sk_buff *skb;
2018
2019	skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
2020	if (!skb)
2021	return ERR_PTR(error: -ENOBUFS);
2022
2023	if (tca_get_fill(skb, actions, portid, seq: n->nlmsg_seq, flags: n->nlmsg_flags,
2024	RTM_NEWACTION, bind: 0, ref: 0, extack) <= 0) {
2025	NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
2026	kfree_skb(skb);
2027	return ERR_PTR(error: -EINVAL);
2028	}
2029
2030	return skb;
2031	}
2032
2033	static int tcf_add_notify(struct net *net, struct nlmsghdr *n,
2034	struct tc_action *actions[], u32 portid,
2035	size_t attr_size, struct netlink_ext_ack *extack)
2036	{
2037	struct sk_buff *skb;
2038
2039	if (!rtnl_notify_needed(net, nlflags: n->nlmsg_flags, RTNLGRP_TC)) {
2040	skb = NULL;
2041	} else {
2042	skb = tcf_add_notify_msg(net, n, actions, portid, attr_size,
2043	extack);
2044	if (IS_ERR(ptr: skb))
2045	return PTR_ERR(ptr: skb);
2046	}
2047
2048	return rtnetlink_maybe_send(skb, net, pid: portid, RTNLGRP_TC,
2049	echo: n->nlmsg_flags & NLM_F_ECHO);
2050	}
2051
2052	static int tcf_action_add(struct net *net, struct nlattr *nla,
2053	struct nlmsghdr *n, u32 portid, u32 flags,
2054	struct netlink_ext_ack *extack)
2055	{
2056	size_t attr_size = 0;
2057	int loop, ret;
2058	struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
2059	int init_res[TCA_ACT_MAX_PRIO] = {};
2060
2061	for (loop = 0; loop < 10; loop++) {
2062	ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
2063	attr_size: &attr_size, flags, fl_flags: 0, extack);
2064	if (ret != -EAGAIN)
2065	break;
2066	}
2067
2068	if (ret < 0)
2069	return ret;
2070
2071	ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
2072
2073	/* only put bound actions */
2074	tca_put_bound_many(actions, init_res);
2075
2076	return ret;
2077	}
2078
2079	static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
2080	[TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2081	TCA_ACT_FLAG_TERSE_DUMP),
2082	[TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
2083	};
2084
2085	static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2086	struct netlink_ext_ack *extack)
2087	{
2088	struct net *net = sock_net(sk: skb->sk);
2089	struct nlattr *tca[TCA_ROOT_MAX + 1];
2090	u32 portid = NETLINK_CB(skb).portid;
2091	u32 flags = 0;
2092	int ret = 0;
2093
2094	if ((n->nlmsg_type != RTM_GETACTION) &&
2095	!netlink_capable(skb, CAP_NET_ADMIN))
2096	return -EPERM;
2097
2098	ret = nlmsg_parse_deprecated(nlh: n, hdrlen: sizeof(struct tcamsg), tb: tca,
2099	TCA_ROOT_MAX, NULL, extack);
2100	if (ret < 0)
2101	return ret;
2102
2103	if (tca[TCA_ACT_TAB] == NULL) {
2104	NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2105	return -EINVAL;
2106	}
2107
2108	/* n->nlmsg_flags & NLM_F_CREATE */
2109	switch (n->nlmsg_type) {
2110	case RTM_NEWACTION:
2111	/* we are going to assume all other flags
2112	* imply create only if it doesn't exist
2113	* Note that CREATE | EXCL implies that
2114	* but since we want avoid ambiguity (eg when flags
2115	* is zero) then just set this
2116	*/
2117	if (n->nlmsg_flags & NLM_F_REPLACE)
2118	flags = TCA_ACT_FLAGS_REPLACE;
2119	ret = tcf_action_add(net, nla: tca[TCA_ACT_TAB], n, portid, flags,
2120	extack);
2121	break;
2122	case RTM_DELACTION:
2123	ret = tca_action_gd(net, nla: tca[TCA_ACT_TAB], n,
2124	portid, RTM_DELACTION, extack);
2125	break;
2126	case RTM_GETACTION:
2127	ret = tca_action_gd(net, nla: tca[TCA_ACT_TAB], n,
2128	portid, RTM_GETACTION, extack);
2129	break;
2130	default:
2131	BUG();
2132	}
2133
2134	return ret;
2135	}
2136
2137	static struct nlattr *find_dump_kind(struct nlattr **nla)
2138	{
2139	struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2140	struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2141	struct nlattr *kind;
2142
2143	tb1 = nla[TCA_ACT_TAB];
2144	if (tb1 == NULL)
2145	return NULL;
2146
2147	if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, head: nla_data(nla: tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2148	return NULL;
2149
2150	if (tb[1] == NULL)
2151	return NULL;
2152	if (nla_parse_nested_deprecated(tb: tb2, TCA_ACT_MAX, nla: tb[1], policy: tcf_action_policy, NULL) < 0)
2153	return NULL;
2154	kind = tb2[TCA_ACT_KIND];
2155
2156	return kind;
2157	}
2158
2159	static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2160	{
2161	struct net *net = sock_net(sk: skb->sk);
2162	struct nlmsghdr *nlh;
2163	unsigned char *b = skb_tail_pointer(skb);
2164	struct nlattr *nest;
2165	struct tc_action_ops *a_o;
2166	int ret = 0;
2167	struct tcamsg *t = (struct tcamsg *) nlmsg_data(nlh: cb->nlh);
2168	struct nlattr *tb[TCA_ROOT_MAX + 1];
2169	struct nlattr *count_attr = NULL;
2170	unsigned long jiffy_since = 0;
2171	struct nlattr *kind = NULL;
2172	struct nla_bitfield32 bf;
2173	u32 msecs_since = 0;
2174	u32 act_count = 0;
2175
2176	ret = nlmsg_parse_deprecated(nlh: cb->nlh, hdrlen: sizeof(struct tcamsg), tb,
2177	TCA_ROOT_MAX, policy: tcaa_policy, extack: cb->extack);
2178	if (ret < 0)
2179	return ret;
2180
2181	kind = find_dump_kind(nla: tb);
2182	if (kind == NULL) {
2183	pr_info("tc_dump_action: action bad kind\n");
2184	return 0;
2185	}
2186
2187	a_o = tc_lookup_action(kind);
2188	if (a_o == NULL)
2189	return 0;
2190
2191	cb->args[2] = 0;
2192	if (tb[TCA_ROOT_FLAGS]) {
2193	bf = nla_get_bitfield32(nla: tb[TCA_ROOT_FLAGS]);
2194	cb->args[2] = bf.value;
2195	}
2196
2197	if (tb[TCA_ROOT_TIME_DELTA]) {
2198	msecs_since = nla_get_u32(nla: tb[TCA_ROOT_TIME_DELTA]);
2199	}
2200
2201	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, seq: cb->nlh->nlmsg_seq,
2202	type: cb->nlh->nlmsg_type, payload: sizeof(*t), flags: 0);
2203	if (!nlh)
2204	goto out_module_put;
2205
2206	if (msecs_since)
2207	jiffy_since = jiffies - msecs_to_jiffies(m: msecs_since);
2208
2209	t = nlmsg_data(nlh);
2210	t->tca_family = AF_UNSPEC;
2211	t->tca__pad1 = 0;
2212	t->tca__pad2 = 0;
2213	cb->args[3] = jiffy_since;
2214	count_attr = nla_reserve(skb, attrtype: TCA_ROOT_COUNT, attrlen: sizeof(u32));
2215	if (!count_attr)
2216	goto out_module_put;
2217
2218	nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2219	if (nest == NULL)
2220	goto out_module_put;
2221
2222	ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, ops: a_o, NULL);
2223	if (ret < 0)
2224	goto out_module_put;
2225
2226	if (ret > 0) {
2227	nla_nest_end(skb, start: nest);
2228	ret = skb->len;
2229	act_count = cb->args[1];
2230	memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2231	cb->args[1] = 0;
2232	} else
2233	nlmsg_trim(skb, mark: b);
2234
2235	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2236	if (NETLINK_CB(cb->skb).portid && ret)
2237	nlh->nlmsg_flags |= NLM_F_MULTI;
2238	module_put(module: a_o->owner);
2239	return skb->len;
2240
2241	out_module_put:
2242	module_put(module: a_o->owner);
2243	nlmsg_trim(skb, mark: b);
2244	return skb->len;
2245	}
2246
2247	static int __init tc_action_init(void)
2248	{
2249	rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, flags: 0);
2250	rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, flags: 0);
2251	rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
2252	flags: 0);
2253
2254	return 0;
2255	}
2256
2257	subsys_initcall(tc_action_init);
2258