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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
29DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
30EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
31#endif
32
33int 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}
42EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
43
44static 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
52static 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(cookie->data);
57 kfree(cookie);
58}
59
60static 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 = unrcu_pointer(xchg(old_cookie, RCU_INITIALIZER(new_cookie)));
66 if (old)
67 call_rcu(&old->rcu, tcf_free_cookie_rcu);
68}
69
70int 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(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 }
101end:
102 return ret;
103}
104EXPORT_SYMBOL(tcf_action_check_ctrlact);
105
106struct 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}
113EXPORT_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 */
120static void free_tcf(struct tc_action *p)
121{
122 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
123
124 free_percpu(p->cpu_bstats);
125 free_percpu(p->cpu_bstats_hw);
126 free_percpu(p->cpu_qstats);
127
128 tcf_set_action_cookie(&p->user_cookie, NULL);
129 if (chain)
130 tcf_chain_put_by_act(chain);
131
132 kfree(p);
133}
134
135static void offload_action_hw_count_set(struct tc_action *act,
136 u32 hw_count)
137{
138 act->in_hw_count = hw_count;
139}
140
141static void offload_action_hw_count_inc(struct tc_action *act,
142 u32 hw_count)
143{
144 act->in_hw_count += hw_count;
145}
146
147static 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
154static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
155{
156 if (is_tcf_pedit(act))
157 return tcf_pedit_nkeys(act);
158 else
159 return 1;
160}
161
162static bool tc_act_skip_hw(u32 flags)
163{
164 return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
165}
166
167static 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. */
173static 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
180static 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(&act->tcfa_lock);
194 err = act->ops->offload_act_setup(act, fl_action, NULL,
195 false, extack);
196 spin_unlock_bh(&act->tcfa_lock);
197 return err;
198 }
199
200 return -EOPNOTSUPP;
201}
202
203static 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, TC_SETUP_ACT,
209 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
219static 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
236static 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
246static 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(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(action->tcfa_flags))
260 return 0;
261
262 num = tcf_offload_act_num_actions_single(action);
263 fl_action = offload_action_alloc(num);
264 if (!fl_action)
265 return -ENOMEM;
266
267 err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
268 if (err)
269 goto fl_err;
270
271 err = tc_setup_action(&fl_action->action, actions, 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_action, &in_hw_count, cb, cb_priv);
279 if (!err)
280 cb ? offload_action_hw_count_inc(action, in_hw_count) :
281 offload_action_hw_count_set(action, in_hw_count);
282
283 if (skip_sw && !tc_act_in_hw(action))
284 err = -EINVAL;
285
286 tc_cleanup_offload_action(&fl_action->action);
287
288fl_err:
289 kfree(fl_action);
290
291 return err;
292}
293
294/* offload the tc action after it is inserted */
295static 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
301int 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_act, action, FLOW_ACT_STATS, NULL);
307 if (err)
308 return err;
309
310 err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
311 if (!err) {
312 preempt_disable();
313 tcf_action_stats_update(action, fl_act.stats.bytes,
314 fl_act.stats.pkts,
315 fl_act.stats.drops,
316 fl_act.stats.lastused,
317 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}
327EXPORT_SYMBOL(tcf_action_update_hw_stats);
328
329static 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(action))
338 return 0;
339
340 err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
341 if (err)
342 return err;
343
344 err = tcf_action_offload_cmd(&fl_act, &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(action, in_hw_count);
354
355 return 0;
356}
357
358static int tcf_action_offload_del(struct tc_action *action)
359{
360 return tcf_action_offload_del_ex(action, NULL, NULL);
361}
362
363static void tcf_action_cleanup(struct tc_action *p)
364{
365 tcf_action_offload_del(p);
366 if (p->ops->cleanup)
367 p->ops->cleanup(p);
368
369 gen_kill_estimator(&p->tcfa_rate_est);
370 free_tcf(p);
371}
372
373static 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(&p->tcfa_refcnt, &idrinfo->lock)) {
378 if (bind)
379 atomic_dec(&p->tcfa_bindcnt);
380 idr_remove(&idrinfo->action_idr, p->tcfa_index);
381 mutex_unlock(&idrinfo->lock);
382
383 tcf_action_cleanup(p);
384 return 1;
385 }
386
387 if (bind)
388 atomic_dec(&p->tcfa_bindcnt);
389
390 return 0;
391}
392
393static 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(&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
420int 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(a, bind, false);
426 if (ret == ACT_P_DELETED)
427 module_put(ops->owner);
428 return ret;
429}
430EXPORT_SYMBOL(tcf_idr_release);
431
432static 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(user_cookie->len);
442 rcu_read_unlock();
443
444 return nla_total_size(0) /* action number nested */
445 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
446 + cookie_len /* TCA_ACT_COOKIE */
447 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
448 + nla_total_size(0) /* TCA_ACT_STATS nested */
449 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
450 /* TCA_STATS_BASIC */
451 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
452 /* TCA_STATS_PKT64 */
453 + nla_total_size_64bit(sizeof(u64))
454 /* TCA_STATS_QUEUE */
455 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
456 + nla_total_size(0) /* TCA_ACT_OPTIONS nested */
457 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
458}
459
460static 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(0) /* TCA_ACT_TAB nested */
465 + sz;
466}
467
468static 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
477static int
478tcf_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, TCA_ACT_KIND, 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, TCA_ACT_INDEX, 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, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
494 rcu_read_unlock();
495 goto nla_put_failure;
496 }
497 }
498 rcu_read_unlock();
499
500 return 0;
501
502nla_put_failure:
503 nlmsg_trim(skb, b);
504 return -1;
505}
506
507static int
508tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
509{
510 unsigned char *b = skb_tail_pointer(skb);
511 struct nlattr *nest;
512 int err = -EINVAL;
513 u32 flags;
514
515 if (tcf_action_dump_terse(skb, a, false))
516 goto nla_put_failure;
517
518 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
519 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
520 a->hw_stats, TCA_ACT_HW_STATS_ANY))
521 goto nla_put_failure;
522
523 if (a->used_hw_stats_valid &&
524 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
525 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
526 goto nla_put_failure;
527
528 flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
529 if (flags &&
530 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
531 flags, flags))
532 goto nla_put_failure;
533
534 if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
535 goto nla_put_failure;
536
537 nest = nla_nest_start_noflag(skb, TCA_ACT_OPTIONS);
538 if (nest == NULL)
539 goto nla_put_failure;
540 err = tcf_action_dump_old(skb, a, bind, ref);
541 if (err > 0) {
542 nla_nest_end(skb, nest);
543 return err;
544 }
545
546nla_put_failure:
547 nlmsg_trim(skb, b);
548 return -1;
549}
550
551static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
552 struct netlink_callback *cb)
553{
554 int err = 0, index = -1, s_i = 0, n_i = 0;
555 u32 act_flags = cb->args[2];
556 unsigned long jiffy_since = cb->args[3];
557 struct nlattr *nest;
558 struct idr *idr = &idrinfo->action_idr;
559 struct tc_action *p;
560 unsigned long id = 1;
561 unsigned long tmp;
562
563 mutex_lock(&idrinfo->lock);
564
565 s_i = cb->args[0];
566
567 idr_for_each_entry_ul(idr, p, tmp, id) {
568 index++;
569 if (index < s_i)
570 continue;
571 if (IS_ERR(p))
572 continue;
573
574 if (jiffy_since &&
575 time_after(jiffy_since,
576 (unsigned long)p->tcfa_tm.lastuse))
577 continue;
578
579 tcf_action_update_hw_stats(p);
580
581 nest = nla_nest_start_noflag(skb, n_i);
582 if (!nest) {
583 index--;
584 goto nla_put_failure;
585 }
586 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
587 tcf_action_dump_terse(skb, p, true) :
588 tcf_action_dump_1(skb, p, 0, 0);
589 if (err < 0) {
590 index--;
591 nlmsg_trim(skb, nest);
592 goto done;
593 }
594 nla_nest_end(skb, nest);
595 n_i++;
596 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
597 n_i >= TCA_ACT_MAX_PRIO)
598 goto done;
599 }
600done:
601 if (index >= 0)
602 cb->args[0] = index + 1;
603
604 mutex_unlock(&idrinfo->lock);
605 if (n_i) {
606 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
607 cb->args[1] = n_i;
608 }
609 return n_i;
610
611nla_put_failure:
612 nla_nest_cancel(skb, nest);
613 goto done;
614}
615
616static int tcf_idr_release_unsafe(struct tc_action *p)
617{
618 if (atomic_read(&p->tcfa_bindcnt) > 0)
619 return -EPERM;
620
621 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
622 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
623 tcf_action_cleanup(p);
624 return ACT_P_DELETED;
625 }
626
627 return 0;
628}
629
630static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
631 const struct tc_action_ops *ops,
632 struct netlink_ext_ack *extack)
633{
634 struct nlattr *nest;
635 int n_i = 0;
636 int ret = -EINVAL;
637 struct idr *idr = &idrinfo->action_idr;
638 struct tc_action *p;
639 unsigned long id = 1;
640 unsigned long tmp;
641
642 nest = nla_nest_start_noflag(skb, 0);
643 if (nest == NULL)
644 goto nla_put_failure;
645 if (nla_put_string(skb, TCA_ACT_KIND, ops->kind))
646 goto nla_put_failure;
647
648 ret = 0;
649 mutex_lock(&idrinfo->lock);
650 idr_for_each_entry_ul(idr, p, tmp, id) {
651 if (IS_ERR(p))
652 continue;
653 ret = tcf_idr_release_unsafe(p);
654 if (ret == ACT_P_DELETED)
655 module_put(ops->owner);
656 else if (ret < 0)
657 break;
658 n_i++;
659 }
660 mutex_unlock(&idrinfo->lock);
661 if (ret < 0) {
662 if (n_i)
663 NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
664 else
665 goto nla_put_failure;
666 }
667
668 ret = nla_put_u32(skb, TCA_FCNT, n_i);
669 if (ret)
670 goto nla_put_failure;
671 nla_nest_end(skb, nest);
672
673 return n_i;
674nla_put_failure:
675 nla_nest_cancel(skb, nest);
676 return ret;
677}
678
679int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
680 struct netlink_callback *cb, int type,
681 const struct tc_action_ops *ops,
682 struct netlink_ext_ack *extack)
683{
684 struct tcf_idrinfo *idrinfo = tn->idrinfo;
685
686 if (type == RTM_DELACTION) {
687 return tcf_del_walker(idrinfo, skb, ops, extack);
688 } else if (type == RTM_GETACTION) {
689 return tcf_dump_walker(idrinfo, skb, cb);
690 } else {
691 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
692 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
693 return -EINVAL;
694 }
695}
696EXPORT_SYMBOL(tcf_generic_walker);
697
698int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
699{
700 struct tcf_idrinfo *idrinfo = tn->idrinfo;
701 struct tc_action *p;
702
703 mutex_lock(&idrinfo->lock);
704 p = idr_find(&idrinfo->action_idr, index);
705 if (IS_ERR(p))
706 p = NULL;
707 else if (p)
708 refcount_inc(&p->tcfa_refcnt);
709 mutex_unlock(&idrinfo->lock);
710
711 if (p) {
712 *a = p;
713 return true;
714 }
715 return false;
716}
717EXPORT_SYMBOL(tcf_idr_search);
718
719static int __tcf_generic_walker(struct net *net, struct sk_buff *skb,
720 struct netlink_callback *cb, int type,
721 const struct tc_action_ops *ops,
722 struct netlink_ext_ack *extack)
723{
724 struct tc_action_net *tn = net_generic(net, ops->net_id);
725
726 if (unlikely(ops->walk))
727 return ops->walk(net, skb, cb, type, ops, extack);
728
729 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
730}
731
732static int __tcf_idr_search(struct net *net,
733 const struct tc_action_ops *ops,
734 struct tc_action **a, u32 index)
735{
736 struct tc_action_net *tn = net_generic(net, ops->net_id);
737
738 if (unlikely(ops->lookup))
739 return ops->lookup(net, a, index);
740
741 return tcf_idr_search(tn, a, index);
742}
743
744static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
745{
746 struct tc_action *p;
747 int ret = 0;
748
749 mutex_lock(&idrinfo->lock);
750 p = idr_find(&idrinfo->action_idr, index);
751 if (!p) {
752 mutex_unlock(&idrinfo->lock);
753 return -ENOENT;
754 }
755
756 if (!atomic_read(&p->tcfa_bindcnt)) {
757 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
758 struct module *owner = p->ops->owner;
759
760 WARN_ON(p != idr_remove(&idrinfo->action_idr,
761 p->tcfa_index));
762 mutex_unlock(&idrinfo->lock);
763
764 tcf_action_cleanup(p);
765 module_put(owner);
766 return 0;
767 }
768 ret = 0;
769 } else {
770 ret = -EPERM;
771 }
772
773 mutex_unlock(&idrinfo->lock);
774 return ret;
775}
776
777int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
778 struct tc_action **a, const struct tc_action_ops *ops,
779 int bind, bool cpustats, u32 flags)
780{
781 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
782 struct tcf_idrinfo *idrinfo = tn->idrinfo;
783 int err = -ENOMEM;
784
785 if (unlikely(!p))
786 return -ENOMEM;
787 refcount_set(&p->tcfa_refcnt, 1);
788 if (bind)
789 atomic_set(&p->tcfa_bindcnt, 1);
790
791 if (cpustats) {
792 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
793 if (!p->cpu_bstats)
794 goto err1;
795 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
796 if (!p->cpu_bstats_hw)
797 goto err2;
798 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
799 if (!p->cpu_qstats)
800 goto err3;
801 }
802 gnet_stats_basic_sync_init(&p->tcfa_bstats);
803 gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
804 spin_lock_init(&p->tcfa_lock);
805 p->tcfa_index = index;
806 p->tcfa_tm.install = jiffies;
807 p->tcfa_tm.lastuse = jiffies;
808 p->tcfa_tm.firstuse = 0;
809 p->tcfa_flags = flags;
810 if (est) {
811 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
812 &p->tcfa_rate_est,
813 &p->tcfa_lock, false, est);
814 if (err)
815 goto err4;
816 }
817
818 p->idrinfo = idrinfo;
819 __module_get(ops->owner);
820 p->ops = ops;
821 *a = p;
822 return 0;
823err4:
824 free_percpu(p->cpu_qstats);
825err3:
826 free_percpu(p->cpu_bstats_hw);
827err2:
828 free_percpu(p->cpu_bstats);
829err1:
830 kfree(p);
831 return err;
832}
833EXPORT_SYMBOL(tcf_idr_create);
834
835int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
836 struct nlattr *est, struct tc_action **a,
837 const struct tc_action_ops *ops, int bind,
838 u32 flags)
839{
840 /* Set cpustats according to actions flags. */
841 return tcf_idr_create(tn, index, est, a, ops, bind,
842 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
843}
844EXPORT_SYMBOL(tcf_idr_create_from_flags);
845
846/* Cleanup idr index that was allocated but not initialized. */
847
848void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
849{
850 struct tcf_idrinfo *idrinfo = tn->idrinfo;
851
852 mutex_lock(&idrinfo->lock);
853 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
854 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
855 mutex_unlock(&idrinfo->lock);
856}
857EXPORT_SYMBOL(tcf_idr_cleanup);
858
859/* Check if action with specified index exists. If actions is found, increments
860 * its reference and bind counters, and return 1. Otherwise insert temporary
861 * error pointer (to prevent concurrent users from inserting actions with same
862 * index) and return 0.
863 *
864 * May return -EAGAIN for binding actions in case of a parallel add/delete on
865 * the requested index.
866 */
867
868int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
869 struct tc_action **a, int bind)
870{
871 struct tcf_idrinfo *idrinfo = tn->idrinfo;
872 struct tc_action *p;
873 int ret;
874 u32 max;
875
876 if (*index) {
877 rcu_read_lock();
878 p = idr_find(&idrinfo->action_idr, *index);
879
880 if (IS_ERR(p)) {
881 /* This means that another process allocated
882 * index but did not assign the pointer yet.
883 */
884 rcu_read_unlock();
885 return -EAGAIN;
886 }
887
888 if (!p) {
889 /* Empty slot, try to allocate it */
890 max = *index;
891 rcu_read_unlock();
892 goto new;
893 }
894
895 if (!refcount_inc_not_zero(&p->tcfa_refcnt)) {
896 /* Action was deleted in parallel */
897 rcu_read_unlock();
898 return -EAGAIN;
899 }
900
901 if (bind)
902 atomic_inc(&p->tcfa_bindcnt);
903 *a = p;
904
905 rcu_read_unlock();
906
907 return 1;
908 } else {
909 /* Find a slot */
910 *index = 1;
911 max = UINT_MAX;
912 }
913
914new:
915 *a = NULL;
916
917 mutex_lock(&idrinfo->lock);
918 ret = idr_alloc_u32(&idrinfo->action_idr, ERR_PTR(-EBUSY), index, max,
919 GFP_KERNEL);
920 mutex_unlock(&idrinfo->lock);
921
922 /* N binds raced for action allocation,
923 * retry for all the ones that failed.
924 */
925 if (ret == -ENOSPC && *index == max)
926 ret = -EAGAIN;
927
928 return ret;
929}
930EXPORT_SYMBOL(tcf_idr_check_alloc);
931
932void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
933 struct tcf_idrinfo *idrinfo)
934{
935 struct idr *idr = &idrinfo->action_idr;
936 struct tc_action *p;
937 int ret;
938 unsigned long id = 1;
939 unsigned long tmp;
940
941 idr_for_each_entry_ul(idr, p, tmp, id) {
942 ret = __tcf_idr_release(p, false, true);
943 if (ret == ACT_P_DELETED)
944 module_put(ops->owner);
945 else if (ret < 0)
946 return;
947 }
948 idr_destroy(&idrinfo->action_idr);
949}
950EXPORT_SYMBOL(tcf_idrinfo_destroy);
951
952static LIST_HEAD(act_base);
953static DEFINE_RWLOCK(act_mod_lock);
954/* since act ops id is stored in pernet subsystem list,
955 * then there is no way to walk through only all the action
956 * subsystem, so we keep tc action pernet ops id for
957 * reoffload to walk through.
958 */
959static LIST_HEAD(act_pernet_id_list);
960static DEFINE_MUTEX(act_id_mutex);
961struct tc_act_pernet_id {
962 struct list_head list;
963 unsigned int id;
964};
965
966static int tcf_pernet_add_id_list(unsigned int id)
967{
968 struct tc_act_pernet_id *id_ptr;
969 int ret = 0;
970
971 mutex_lock(&act_id_mutex);
972 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
973 if (id_ptr->id == id) {
974 ret = -EEXIST;
975 goto err_out;
976 }
977 }
978
979 id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
980 if (!id_ptr) {
981 ret = -ENOMEM;
982 goto err_out;
983 }
984 id_ptr->id = id;
985
986 list_add_tail(&id_ptr->list, &act_pernet_id_list);
987
988err_out:
989 mutex_unlock(&act_id_mutex);
990 return ret;
991}
992
993static void tcf_pernet_del_id_list(unsigned int id)
994{
995 struct tc_act_pernet_id *id_ptr;
996
997 mutex_lock(&act_id_mutex);
998 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
999 if (id_ptr->id == id) {
1000 list_del(&id_ptr->list);
1001 kfree(id_ptr);
1002 break;
1003 }
1004 }
1005 mutex_unlock(&act_id_mutex);
1006}
1007
1008int tcf_register_action(struct tc_action_ops *act,
1009 struct pernet_operations *ops)
1010{
1011 struct tc_action_ops *a;
1012 int ret;
1013
1014 if (!act->act || !act->dump || !act->init)
1015 return -EINVAL;
1016
1017 /* We have to register pernet ops before making the action ops visible,
1018 * otherwise tcf_action_init_1() could get a partially initialized
1019 * netns.
1020 */
1021 ret = register_pernet_subsys(ops);
1022 if (ret)
1023 return ret;
1024
1025 if (ops->id) {
1026 ret = tcf_pernet_add_id_list(*ops->id);
1027 if (ret)
1028 goto err_id;
1029 }
1030
1031 write_lock(&act_mod_lock);
1032 list_for_each_entry(a, &act_base, head) {
1033 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
1034 ret = -EEXIST;
1035 goto err_out;
1036 }
1037 }
1038 list_add_tail(&act->head, &act_base);
1039 write_unlock(&act_mod_lock);
1040
1041 return 0;
1042
1043err_out:
1044 write_unlock(&act_mod_lock);
1045 if (ops->id)
1046 tcf_pernet_del_id_list(*ops->id);
1047err_id:
1048 unregister_pernet_subsys(ops);
1049 return ret;
1050}
1051EXPORT_SYMBOL(tcf_register_action);
1052
1053int tcf_unregister_action(struct tc_action_ops *act,
1054 struct pernet_operations *ops)
1055{
1056 struct tc_action_ops *a;
1057 int err = -ENOENT;
1058
1059 write_lock(&act_mod_lock);
1060 list_for_each_entry(a, &act_base, head) {
1061 if (a == act) {
1062 list_del(&act->head);
1063 err = 0;
1064 break;
1065 }
1066 }
1067 write_unlock(&act_mod_lock);
1068 if (!err) {
1069 unregister_pernet_subsys(ops);
1070 if (ops->id)
1071 tcf_pernet_del_id_list(*ops->id);
1072 }
1073 return err;
1074}
1075EXPORT_SYMBOL(tcf_unregister_action);
1076
1077/* lookup by name */
1078static struct tc_action_ops *tc_lookup_action_n(char *kind)
1079{
1080 struct tc_action_ops *a, *res = NULL;
1081
1082 if (kind) {
1083 read_lock(&act_mod_lock);
1084 list_for_each_entry(a, &act_base, head) {
1085 if (strcmp(kind, a->kind) == 0) {
1086 if (try_module_get(a->owner))
1087 res = a;
1088 break;
1089 }
1090 }
1091 read_unlock(&act_mod_lock);
1092 }
1093 return res;
1094}
1095
1096/* lookup by nlattr */
1097static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1098{
1099 struct tc_action_ops *a, *res = NULL;
1100
1101 if (kind) {
1102 read_lock(&act_mod_lock);
1103 list_for_each_entry(a, &act_base, head) {
1104 if (nla_strcmp(kind, a->kind) == 0) {
1105 if (try_module_get(a->owner))
1106 res = a;
1107 break;
1108 }
1109 }
1110 read_unlock(&act_mod_lock);
1111 }
1112 return res;
1113}
1114
1115/*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1116#define TCA_ACT_MAX_PRIO_MASK 0x1FF
1117int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1118 int nr_actions, struct tcf_result *res)
1119{
1120 u32 jmp_prgcnt = 0;
1121 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1122 int i;
1123 int ret = TC_ACT_OK;
1124
1125 if (skb_skip_tc_classify(skb))
1126 return TC_ACT_OK;
1127
1128restart_act_graph:
1129 for (i = 0; i < nr_actions; i++) {
1130 const struct tc_action *a = actions[i];
1131 int repeat_ttl;
1132
1133 if (jmp_prgcnt > 0) {
1134 jmp_prgcnt -= 1;
1135 continue;
1136 }
1137
1138 if (tc_act_skip_sw(a->tcfa_flags))
1139 continue;
1140
1141 repeat_ttl = 32;
1142repeat:
1143 ret = tc_act(skb, a, res);
1144 if (unlikely(ret == TC_ACT_REPEAT)) {
1145 if (--repeat_ttl != 0)
1146 goto repeat;
1147 /* suspicious opcode, stop pipeline */
1148 net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1149 return TC_ACT_OK;
1150 }
1151 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1152 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1153 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1154 /* faulty opcode, stop pipeline */
1155 return TC_ACT_OK;
1156 } else {
1157 jmp_ttl -= 1;
1158 if (jmp_ttl > 0)
1159 goto restart_act_graph;
1160 else /* faulty graph, stop pipeline */
1161 return TC_ACT_OK;
1162 }
1163 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1164 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1165 tcf_set_drop_reason(skb,
1166 SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
1167 return TC_ACT_SHOT;
1168 }
1169 tcf_action_goto_chain_exec(a, res);
1170 }
1171
1172 if (ret != TC_ACT_PIPE)
1173 break;
1174 }
1175
1176 return ret;
1177}
1178EXPORT_SYMBOL(tcf_action_exec);
1179
1180int tcf_action_destroy(struct tc_action *actions[], int bind)
1181{
1182 const struct tc_action_ops *ops;
1183 struct tc_action *a;
1184 int ret = 0, i;
1185
1186 tcf_act_for_each_action(i, a, actions) {
1187 actions[i] = NULL;
1188 ops = a->ops;
1189 ret = __tcf_idr_release(a, bind, true);
1190 if (ret == ACT_P_DELETED)
1191 module_put(ops->owner);
1192 else if (ret < 0)
1193 return ret;
1194 }
1195 return ret;
1196}
1197
1198static int tcf_action_put(struct tc_action *p)
1199{
1200 return __tcf_action_put(p, false);
1201}
1202
1203static void tcf_action_put_many(struct tc_action *actions[])
1204{
1205 struct tc_action *a;
1206 int i;
1207
1208 tcf_act_for_each_action(i, a, actions) {
1209 const struct tc_action_ops *ops = a->ops;
1210 if (tcf_action_put(a))
1211 module_put(ops->owner);
1212 }
1213}
1214
1215static void tca_put_bound_many(struct tc_action *actions[], int init_res[])
1216{
1217 struct tc_action *a;
1218 int i;
1219
1220 tcf_act_for_each_action(i, a, actions) {
1221 const struct tc_action_ops *ops = a->ops;
1222
1223 if (init_res[i] == ACT_P_CREATED)
1224 continue;
1225
1226 if (tcf_action_put(a))
1227 module_put(ops->owner);
1228 }
1229}
1230
1231int
1232tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1233{
1234 return a->ops->dump(skb, a, bind, ref);
1235}
1236
1237int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1238 int bind, int ref, bool terse)
1239{
1240 struct tc_action *a;
1241 int err = -EINVAL, i;
1242 struct nlattr *nest;
1243
1244 tcf_act_for_each_action(i, a, actions) {
1245 nest = nla_nest_start_noflag(skb, i + 1);
1246 if (nest == NULL)
1247 goto nla_put_failure;
1248 err = terse ? tcf_action_dump_terse(skb, a, false) :
1249 tcf_action_dump_1(skb, a, bind, ref);
1250 if (err < 0)
1251 goto errout;
1252 nla_nest_end(skb, nest);
1253 }
1254
1255 return 0;
1256
1257nla_put_failure:
1258 err = -EINVAL;
1259errout:
1260 nla_nest_cancel(skb, nest);
1261 return err;
1262}
1263
1264static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1265{
1266 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1267 if (!c)
1268 return NULL;
1269
1270 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1271 if (!c->data) {
1272 kfree(c);
1273 return NULL;
1274 }
1275 c->len = nla_len(tb[TCA_ACT_COOKIE]);
1276
1277 return c;
1278}
1279
1280static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1281{
1282 struct nla_bitfield32 hw_stats_bf;
1283
1284 /* If the user did not pass the attr, that means he does
1285 * not care about the type. Return "any" in that case
1286 * which is setting on all supported types.
1287 */
1288 if (!hw_stats_attr)
1289 return TCA_ACT_HW_STATS_ANY;
1290 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
1291 return hw_stats_bf.value;
1292}
1293
1294static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1295 [TCA_ACT_KIND] = { .type = NLA_STRING },
1296 [TCA_ACT_INDEX] = { .type = NLA_U32 },
1297 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
1298 .len = TC_COOKIE_MAX_SIZE },
1299 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
1300 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1301 TCA_ACT_FLAGS_SKIP_HW |
1302 TCA_ACT_FLAGS_SKIP_SW),
1303 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1304};
1305
1306void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
1307{
1308 struct tc_action *a;
1309 int i;
1310
1311 tcf_act_for_each_action(i, a, actions) {
1312 struct tcf_idrinfo *idrinfo;
1313
1314 if (init_res[i] == ACT_P_BOUND)
1315 continue;
1316
1317 idrinfo = a->idrinfo;
1318 mutex_lock(&idrinfo->lock);
1319 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
1320 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1321 mutex_unlock(&idrinfo->lock);
1322 }
1323}
1324
1325struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
1326 struct netlink_ext_ack *extack)
1327{
1328 bool police = flags & TCA_ACT_FLAGS_POLICE;
1329 struct nlattr *tb[TCA_ACT_MAX + 1];
1330 struct tc_action_ops *a_o;
1331 char act_name[IFNAMSIZ];
1332 struct nlattr *kind;
1333 int err;
1334
1335 if (!police) {
1336 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1337 tcf_action_policy, extack);
1338 if (err < 0)
1339 return ERR_PTR(err);
1340 err = -EINVAL;
1341 kind = tb[TCA_ACT_KIND];
1342 if (!kind) {
1343 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1344 return ERR_PTR(err);
1345 }
1346 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
1347 NL_SET_ERR_MSG(extack, "TC action name too long");
1348 return ERR_PTR(err);
1349 }
1350 } else {
1351 if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
1352 NL_SET_ERR_MSG(extack, "TC action name too long");
1353 return ERR_PTR(-EINVAL);
1354 }
1355 }
1356
1357 a_o = tc_lookup_action_n(act_name);
1358 if (a_o == NULL) {
1359#ifdef CONFIG_MODULES
1360 bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL);
1361
1362 if (rtnl_held)
1363 rtnl_unlock();
1364 request_module(NET_ACT_ALIAS_PREFIX "%s", act_name);
1365 if (rtnl_held)
1366 rtnl_lock();
1367
1368 a_o = tc_lookup_action_n(act_name);
1369
1370 /* We dropped the RTNL semaphore in order to
1371 * perform the module load. So, even if we
1372 * succeeded in loading the module we have to
1373 * tell the caller to replay the request. We
1374 * indicate this using -EAGAIN.
1375 */
1376 if (a_o != NULL) {
1377 module_put(a_o->owner);
1378 return ERR_PTR(-EAGAIN);
1379 }
1380#endif
1381 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1382 return ERR_PTR(-ENOENT);
1383 }
1384
1385 return a_o;
1386}
1387
1388struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1389 struct nlattr *nla, struct nlattr *est,
1390 struct tc_action_ops *a_o, int *init_res,
1391 u32 flags, struct netlink_ext_ack *extack)
1392{
1393 bool police = flags & TCA_ACT_FLAGS_POLICE;
1394 struct nla_bitfield32 userflags = { 0, 0 };
1395 struct tc_cookie *user_cookie = NULL;
1396 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1397 struct nlattr *tb[TCA_ACT_MAX + 1];
1398 struct tc_action *a;
1399 int err;
1400
1401 /* backward compatibility for policer */
1402 if (!police) {
1403 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1404 tcf_action_policy, extack);
1405 if (err < 0)
1406 return ERR_PTR(err);
1407 if (tb[TCA_ACT_COOKIE]) {
1408 user_cookie = nla_memdup_cookie(tb);
1409 if (!user_cookie) {
1410 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1411 err = -ENOMEM;
1412 goto err_out;
1413 }
1414 }
1415 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1416 if (tb[TCA_ACT_FLAGS]) {
1417 userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1418 if (!tc_act_flags_valid(userflags.value)) {
1419 err = -EINVAL;
1420 goto err_out;
1421 }
1422 }
1423
1424 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1425 userflags.value | flags, extack);
1426 } else {
1427 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1428 extack);
1429 }
1430 if (err < 0)
1431 goto err_out;
1432 *init_res = err;
1433
1434 if (!police && tb[TCA_ACT_COOKIE])
1435 tcf_set_action_cookie(&a->user_cookie, user_cookie);
1436
1437 if (!police)
1438 a->hw_stats = hw_stats;
1439
1440 return a;
1441
1442err_out:
1443 if (user_cookie) {
1444 kfree(user_cookie->data);
1445 kfree(user_cookie);
1446 }
1447 return ERR_PTR(err);
1448}
1449
1450static bool tc_act_bind(u32 flags)
1451{
1452 return !!(flags & TCA_ACT_FLAGS_BIND);
1453}
1454
1455/* Returns numbers of initialized actions or negative error. */
1456
1457int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1458 struct nlattr *est, struct tc_action *actions[],
1459 int init_res[], size_t *attr_size,
1460 u32 flags, u32 fl_flags,
1461 struct netlink_ext_ack *extack)
1462{
1463 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1464 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1465 struct tc_action *act;
1466 size_t sz = 0;
1467 int err;
1468 int i;
1469
1470 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1471 extack);
1472 if (err < 0)
1473 return err;
1474
1475 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1476 struct tc_action_ops *a_o;
1477
1478 a_o = tc_action_load_ops(tb[i], flags, extack);
1479 if (IS_ERR(a_o)) {
1480 err = PTR_ERR(a_o);
1481 goto err_mod;
1482 }
1483 ops[i - 1] = a_o;
1484 }
1485
1486 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1487 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1488 &init_res[i - 1], flags, extack);
1489 if (IS_ERR(act)) {
1490 err = PTR_ERR(act);
1491 goto err;
1492 }
1493 sz += tcf_action_fill_size(act);
1494 /* Start from index 0 */
1495 actions[i - 1] = act;
1496 if (tc_act_bind(flags)) {
1497 bool skip_sw = tc_skip_sw(fl_flags);
1498 bool skip_hw = tc_skip_hw(fl_flags);
1499
1500 if (tc_act_bind(act->tcfa_flags)) {
1501 /* Action is created by classifier and is not
1502 * standalone. Check that the user did not set
1503 * any action flags different than the
1504 * classifier flags, and inherit the flags from
1505 * the classifier for the compatibility case
1506 * where no flags were specified at all.
1507 */
1508 if ((tc_act_skip_sw(act->tcfa_flags) && !skip_sw) ||
1509 (tc_act_skip_hw(act->tcfa_flags) && !skip_hw)) {
1510 NL_SET_ERR_MSG(extack,
1511 "Mismatch between action and filter offload flags");
1512 err = -EINVAL;
1513 goto err;
1514 }
1515 if (skip_sw)
1516 act->tcfa_flags |= TCA_ACT_FLAGS_SKIP_SW;
1517 if (skip_hw)
1518 act->tcfa_flags |= TCA_ACT_FLAGS_SKIP_HW;
1519 continue;
1520 }
1521
1522 /* Action is standalone */
1523 if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1524 skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
1525 NL_SET_ERR_MSG(extack,
1526 "Mismatch between action and filter offload flags");
1527 err = -EINVAL;
1528 goto err;
1529 }
1530 } else {
1531 err = tcf_action_offload_add(act, extack);
1532 if (tc_act_skip_sw(act->tcfa_flags) && err)
1533 goto err;
1534 }
1535 }
1536
1537 /* We have to commit them all together, because if any error happened in
1538 * between, we could not handle the failure gracefully.
1539 */
1540 tcf_idr_insert_many(actions, init_res);
1541
1542 *attr_size = tcf_action_full_attrs_size(sz);
1543 err = i - 1;
1544 goto err_mod;
1545
1546err:
1547 tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
1548err_mod:
1549 for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++)
1550 module_put(ops[i]->owner);
1551 return err;
1552}
1553
1554void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1555 u64 drops, bool hw)
1556{
1557 if (a->cpu_bstats) {
1558 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1559
1560 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1561
1562 if (hw)
1563 _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1564 bytes, packets);
1565 return;
1566 }
1567
1568 _bstats_update(&a->tcfa_bstats, bytes, packets);
1569 a->tcfa_qstats.drops += drops;
1570 if (hw)
1571 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1572}
1573EXPORT_SYMBOL(tcf_action_update_stats);
1574
1575int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1576 int compat_mode)
1577{
1578 int err = 0;
1579 struct gnet_dump d;
1580
1581 if (p == NULL)
1582 goto errout;
1583
1584 /* compat_mode being true specifies a call that is supposed
1585 * to add additional backward compatibility statistic TLVs.
1586 */
1587 if (compat_mode) {
1588 if (p->type == TCA_OLD_COMPAT)
1589 err = gnet_stats_start_copy_compat(skb, 0,
1590 TCA_STATS,
1591 TCA_XSTATS,
1592 &p->tcfa_lock, &d,
1593 TCA_PAD);
1594 else
1595 return 0;
1596 } else
1597 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1598 &p->tcfa_lock, &d, TCA_ACT_PAD);
1599
1600 if (err < 0)
1601 goto errout;
1602
1603 if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1604 &p->tcfa_bstats, false) < 0 ||
1605 gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1606 &p->tcfa_bstats_hw, false) < 0 ||
1607 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1608 gnet_stats_copy_queue(&d, p->cpu_qstats,
1609 &p->tcfa_qstats,
1610 p->tcfa_qstats.qlen) < 0)
1611 goto errout;
1612
1613 if (gnet_stats_finish_copy(&d) < 0)
1614 goto errout;
1615
1616 return 0;
1617
1618errout:
1619 return -1;
1620}
1621
1622static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1623 u32 portid, u32 seq, u16 flags, int event, int bind,
1624 int ref, struct netlink_ext_ack *extack)
1625{
1626 struct tcamsg *t;
1627 struct nlmsghdr *nlh;
1628 unsigned char *b = skb_tail_pointer(skb);
1629 struct nlattr *nest;
1630
1631 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1632 if (!nlh)
1633 goto out_nlmsg_trim;
1634 t = nlmsg_data(nlh);
1635 t->tca_family = AF_UNSPEC;
1636 t->tca__pad1 = 0;
1637 t->tca__pad2 = 0;
1638
1639 if (extack && extack->_msg &&
1640 nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg))
1641 goto out_nlmsg_trim;
1642
1643 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1644 if (!nest)
1645 goto out_nlmsg_trim;
1646
1647 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1648 goto out_nlmsg_trim;
1649
1650 nla_nest_end(skb, nest);
1651
1652 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1653
1654 return skb->len;
1655
1656out_nlmsg_trim:
1657 nlmsg_trim(skb, b);
1658 return -1;
1659}
1660
1661static int
1662tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1663 struct tc_action *actions[], int event,
1664 struct netlink_ext_ack *extack)
1665{
1666 struct sk_buff *skb;
1667
1668 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1669 if (!skb)
1670 return -ENOBUFS;
1671 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1672 0, 1, NULL) <= 0) {
1673 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1674 kfree_skb(skb);
1675 return -EINVAL;
1676 }
1677
1678 return rtnl_unicast(skb, net, portid);
1679}
1680
1681static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1682 struct nlmsghdr *n, u32 portid,
1683 struct netlink_ext_ack *extack)
1684{
1685 struct nlattr *tb[TCA_ACT_MAX + 1];
1686 const struct tc_action_ops *ops;
1687 struct tc_action *a;
1688 int index;
1689 int err;
1690
1691 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1692 tcf_action_policy, extack);
1693 if (err < 0)
1694 goto err_out;
1695
1696 err = -EINVAL;
1697 if (tb[TCA_ACT_INDEX] == NULL ||
1698 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1699 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1700 goto err_out;
1701 }
1702 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1703
1704 err = -EINVAL;
1705 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1706 if (!ops) { /* could happen in batch of actions */
1707 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1708 goto err_out;
1709 }
1710 err = -ENOENT;
1711 if (__tcf_idr_search(net, ops, &a, index) == 0) {
1712 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1713 goto err_mod;
1714 }
1715
1716 module_put(ops->owner);
1717 return a;
1718
1719err_mod:
1720 module_put(ops->owner);
1721err_out:
1722 return ERR_PTR(err);
1723}
1724
1725static int tca_action_flush(struct net *net, struct nlattr *nla,
1726 struct nlmsghdr *n, u32 portid,
1727 struct netlink_ext_ack *extack)
1728{
1729 struct sk_buff *skb;
1730 unsigned char *b;
1731 struct nlmsghdr *nlh;
1732 struct tcamsg *t;
1733 struct netlink_callback dcb;
1734 struct nlattr *nest;
1735 struct nlattr *tb[TCA_ACT_MAX + 1];
1736 const struct tc_action_ops *ops;
1737 struct nlattr *kind;
1738 int err = -ENOMEM;
1739
1740 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1741 if (!skb)
1742 return err;
1743
1744 b = skb_tail_pointer(skb);
1745
1746 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1747 tcf_action_policy, extack);
1748 if (err < 0)
1749 goto err_out;
1750
1751 err = -EINVAL;
1752 kind = tb[TCA_ACT_KIND];
1753 ops = tc_lookup_action(kind);
1754 if (!ops) { /*some idjot trying to flush unknown action */
1755 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1756 goto err_out;
1757 }
1758
1759 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1760 sizeof(*t), 0);
1761 if (!nlh) {
1762 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1763 goto out_module_put;
1764 }
1765 t = nlmsg_data(nlh);
1766 t->tca_family = AF_UNSPEC;
1767 t->tca__pad1 = 0;
1768 t->tca__pad2 = 0;
1769
1770 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1771 if (!nest) {
1772 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1773 goto out_module_put;
1774 }
1775
1776 err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack);
1777 if (err <= 0) {
1778 nla_nest_cancel(skb, nest);
1779 goto out_module_put;
1780 }
1781
1782 nla_nest_end(skb, nest);
1783
1784 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1785 nlh->nlmsg_flags |= NLM_F_ROOT;
1786 module_put(ops->owner);
1787 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1788 n->nlmsg_flags & NLM_F_ECHO);
1789 if (err < 0)
1790 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1791
1792 return err;
1793
1794out_module_put:
1795 module_put(ops->owner);
1796err_out:
1797 kfree_skb(skb);
1798 return err;
1799}
1800
1801static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1802{
1803 struct tc_action *a;
1804 int i;
1805
1806 tcf_act_for_each_action(i, a, actions) {
1807 const struct tc_action_ops *ops = a->ops;
1808 /* Actions can be deleted concurrently so we must save their
1809 * type and id to search again after reference is released.
1810 */
1811 struct tcf_idrinfo *idrinfo = a->idrinfo;
1812 u32 act_index = a->tcfa_index;
1813
1814 actions[i] = NULL;
1815 if (tcf_action_put(a)) {
1816 /* last reference, action was deleted concurrently */
1817 module_put(ops->owner);
1818 } else {
1819 int ret;
1820
1821 /* now do the delete */
1822 ret = tcf_idr_delete_index(idrinfo, act_index);
1823 if (ret < 0)
1824 return ret;
1825 }
1826 }
1827 return 0;
1828}
1829
1830static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net,
1831 struct tc_action *action)
1832{
1833 size_t attr_size = tcf_action_fill_size(action);
1834 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1835 [0] = action,
1836 };
1837 struct sk_buff *skb;
1838
1839 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1840 if (!skb)
1841 return ERR_PTR(-ENOBUFS);
1842
1843 if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) {
1844 kfree_skb(skb);
1845 return ERR_PTR(-EINVAL);
1846 }
1847
1848 return skb;
1849}
1850
1851static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1852{
1853 const struct tc_action_ops *ops = action->ops;
1854 struct sk_buff *skb;
1855 int ret;
1856
1857 if (!rtnl_notify_needed(net, 0, RTNLGRP_TC)) {
1858 skb = NULL;
1859 } else {
1860 skb = tcf_reoffload_del_notify_msg(net, action);
1861 if (IS_ERR(skb))
1862 return PTR_ERR(skb);
1863 }
1864
1865 ret = tcf_idr_release_unsafe(action);
1866 if (ret == ACT_P_DELETED) {
1867 module_put(ops->owner);
1868 ret = rtnetlink_maybe_send(skb, net, 0, RTNLGRP_TC, 0);
1869 } else {
1870 kfree_skb(skb);
1871 }
1872
1873 return ret;
1874}
1875
1876int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1877 void *cb_priv, bool add)
1878{
1879 struct tc_act_pernet_id *id_ptr;
1880 struct tcf_idrinfo *idrinfo;
1881 struct tc_action_net *tn;
1882 struct tc_action *p;
1883 unsigned int act_id;
1884 unsigned long tmp;
1885 unsigned long id;
1886 struct idr *idr;
1887 struct net *net;
1888 int ret;
1889
1890 if (!cb)
1891 return -EINVAL;
1892
1893 down_read(&net_rwsem);
1894 mutex_lock(&act_id_mutex);
1895
1896 for_each_net(net) {
1897 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1898 act_id = id_ptr->id;
1899 tn = net_generic(net, act_id);
1900 if (!tn)
1901 continue;
1902 idrinfo = tn->idrinfo;
1903 if (!idrinfo)
1904 continue;
1905
1906 mutex_lock(&idrinfo->lock);
1907 idr = &idrinfo->action_idr;
1908 idr_for_each_entry_ul(idr, p, tmp, id) {
1909 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1910 continue;
1911 if (add) {
1912 tcf_action_offload_add_ex(p, NULL, cb,
1913 cb_priv);
1914 continue;
1915 }
1916
1917 /* cb unregister to update hw count */
1918 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1919 if (ret < 0)
1920 continue;
1921 if (tc_act_skip_sw(p->tcfa_flags) &&
1922 !tc_act_in_hw(p))
1923 tcf_reoffload_del_notify(net, p);
1924 }
1925 mutex_unlock(&idrinfo->lock);
1926 }
1927 }
1928 mutex_unlock(&act_id_mutex);
1929 up_read(&net_rwsem);
1930
1931 return 0;
1932}
1933
1934static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n,
1935 struct tc_action *actions[],
1936 u32 portid, size_t attr_size,
1937 struct netlink_ext_ack *extack)
1938{
1939 struct sk_buff *skb;
1940
1941 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1942 if (!skb)
1943 return ERR_PTR(-ENOBUFS);
1944
1945 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1946 0, 2, extack) <= 0) {
1947 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1948 kfree_skb(skb);
1949 return ERR_PTR(-EINVAL);
1950 }
1951
1952 return skb;
1953}
1954
1955static int tcf_del_notify(struct net *net, struct nlmsghdr *n,
1956 struct tc_action *actions[], u32 portid,
1957 size_t attr_size, struct netlink_ext_ack *extack)
1958{
1959 struct sk_buff *skb;
1960 int ret;
1961
1962 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
1963 skb = NULL;
1964 } else {
1965 skb = tcf_del_notify_msg(net, n, actions, portid, attr_size,
1966 extack);
1967 if (IS_ERR(skb))
1968 return PTR_ERR(skb);
1969 }
1970
1971 /* now do the delete */
1972 ret = tcf_action_delete(net, actions);
1973 if (ret < 0) {
1974 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1975 kfree_skb(skb);
1976 return ret;
1977 }
1978
1979 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
1980 n->nlmsg_flags & NLM_F_ECHO);
1981}
1982
1983static int
1984tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1985 u32 portid, int event, struct netlink_ext_ack *extack)
1986{
1987 int i, ret;
1988 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1989 struct tc_action *act;
1990 size_t attr_size = 0;
1991 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1992
1993 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1994 extack);
1995 if (ret < 0)
1996 return ret;
1997
1998 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1999 if (tb[1])
2000 return tca_action_flush(net, tb[1], n, portid, extack);
2001
2002 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
2003 return -EINVAL;
2004 }
2005
2006 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
2007 act = tcf_action_get_1(net, tb[i], n, portid, extack);
2008 if (IS_ERR(act)) {
2009 ret = PTR_ERR(act);
2010 goto err;
2011 }
2012 attr_size += tcf_action_fill_size(act);
2013 actions[i - 1] = act;
2014 }
2015
2016 attr_size = tcf_action_full_attrs_size(attr_size);
2017
2018 if (event == RTM_GETACTION)
2019 ret = tcf_get_notify(net, portid, n, actions, event, extack);
2020 else { /* delete */
2021 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
2022 if (ret)
2023 goto err;
2024 return 0;
2025 }
2026err:
2027 tcf_action_put_many(actions);
2028 return ret;
2029}
2030
2031static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n,
2032 struct tc_action *actions[],
2033 u32 portid, size_t attr_size,
2034 struct netlink_ext_ack *extack)
2035{
2036 struct sk_buff *skb;
2037
2038 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
2039 if (!skb)
2040 return ERR_PTR(-ENOBUFS);
2041
2042 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
2043 RTM_NEWACTION, 0, 0, extack) <= 0) {
2044 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
2045 kfree_skb(skb);
2046 return ERR_PTR(-EINVAL);
2047 }
2048
2049 return skb;
2050}
2051
2052static int tcf_add_notify(struct net *net, struct nlmsghdr *n,
2053 struct tc_action *actions[], u32 portid,
2054 size_t attr_size, struct netlink_ext_ack *extack)
2055{
2056 struct sk_buff *skb;
2057
2058 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
2059 skb = NULL;
2060 } else {
2061 skb = tcf_add_notify_msg(net, n, actions, portid, attr_size,
2062 extack);
2063 if (IS_ERR(skb))
2064 return PTR_ERR(skb);
2065 }
2066
2067 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
2068 n->nlmsg_flags & NLM_F_ECHO);
2069}
2070
2071static int tcf_action_add(struct net *net, struct nlattr *nla,
2072 struct nlmsghdr *n, u32 portid, u32 flags,
2073 struct netlink_ext_ack *extack)
2074{
2075 size_t attr_size = 0;
2076 int loop, ret;
2077 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
2078 int init_res[TCA_ACT_MAX_PRIO] = {};
2079
2080 for (loop = 0; loop < 10; loop++) {
2081 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
2082 &attr_size, flags, 0, extack);
2083 if (ret != -EAGAIN)
2084 break;
2085 }
2086
2087 if (ret < 0)
2088 return ret;
2089
2090 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
2091
2092 /* only put bound actions */
2093 tca_put_bound_many(actions, init_res);
2094
2095 return ret;
2096}
2097
2098static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
2099 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2100 TCA_ACT_FLAG_TERSE_DUMP),
2101 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
2102};
2103
2104static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2105 struct netlink_ext_ack *extack)
2106{
2107 struct net *net = sock_net(skb->sk);
2108 struct nlattr *tca[TCA_ROOT_MAX + 1];
2109 u32 portid = NETLINK_CB(skb).portid;
2110 u32 flags = 0;
2111 int ret = 0;
2112
2113 if ((n->nlmsg_type != RTM_GETACTION) &&
2114 !netlink_capable(skb, CAP_NET_ADMIN))
2115 return -EPERM;
2116
2117 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
2118 TCA_ROOT_MAX, NULL, extack);
2119 if (ret < 0)
2120 return ret;
2121
2122 if (tca[TCA_ACT_TAB] == NULL) {
2123 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2124 return -EINVAL;
2125 }
2126
2127 /* n->nlmsg_flags & NLM_F_CREATE */
2128 switch (n->nlmsg_type) {
2129 case RTM_NEWACTION:
2130 /* we are going to assume all other flags
2131 * imply create only if it doesn't exist
2132 * Note that CREATE | EXCL implies that
2133 * but since we want avoid ambiguity (eg when flags
2134 * is zero) then just set this
2135 */
2136 if (n->nlmsg_flags & NLM_F_REPLACE)
2137 flags = TCA_ACT_FLAGS_REPLACE;
2138 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
2139 extack);
2140 break;
2141 case RTM_DELACTION:
2142 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2143 portid, RTM_DELACTION, extack);
2144 break;
2145 case RTM_GETACTION:
2146 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2147 portid, RTM_GETACTION, extack);
2148 break;
2149 default:
2150 BUG();
2151 }
2152
2153 return ret;
2154}
2155
2156static struct nlattr *find_dump_kind(struct nlattr **nla)
2157{
2158 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2159 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2160 struct nlattr *kind;
2161
2162 tb1 = nla[TCA_ACT_TAB];
2163 if (tb1 == NULL)
2164 return NULL;
2165
2166 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2167 return NULL;
2168
2169 if (tb[1] == NULL)
2170 return NULL;
2171 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
2172 return NULL;
2173 kind = tb2[TCA_ACT_KIND];
2174
2175 return kind;
2176}
2177
2178static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2179{
2180 struct net *net = sock_net(skb->sk);
2181 struct nlmsghdr *nlh;
2182 unsigned char *b = skb_tail_pointer(skb);
2183 struct nlattr *nest;
2184 struct tc_action_ops *a_o;
2185 int ret = 0;
2186 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
2187 struct nlattr *tb[TCA_ROOT_MAX + 1];
2188 struct nlattr *count_attr = NULL;
2189 unsigned long jiffy_since = 0;
2190 struct nlattr *kind = NULL;
2191 struct nla_bitfield32 bf;
2192 u32 msecs_since = 0;
2193 u32 act_count = 0;
2194
2195 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2196 TCA_ROOT_MAX, tcaa_policy, cb->extack);
2197 if (ret < 0)
2198 return ret;
2199
2200 kind = find_dump_kind(tb);
2201 if (kind == NULL) {
2202 pr_info("tc_dump_action: action bad kind\n");
2203 return 0;
2204 }
2205
2206 a_o = tc_lookup_action(kind);
2207 if (a_o == NULL)
2208 return 0;
2209
2210 cb->args[2] = 0;
2211 if (tb[TCA_ROOT_FLAGS]) {
2212 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2213 cb->args[2] = bf.value;
2214 }
2215
2216 if (tb[TCA_ROOT_TIME_DELTA]) {
2217 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2218 }
2219
2220 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2221 cb->nlh->nlmsg_type, sizeof(*t), 0);
2222 if (!nlh)
2223 goto out_module_put;
2224
2225 if (msecs_since)
2226 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2227
2228 t = nlmsg_data(nlh);
2229 t->tca_family = AF_UNSPEC;
2230 t->tca__pad1 = 0;
2231 t->tca__pad2 = 0;
2232 cb->args[3] = jiffy_since;
2233 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2234 if (!count_attr)
2235 goto out_module_put;
2236
2237 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2238 if (nest == NULL)
2239 goto out_module_put;
2240
2241 ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL);
2242 if (ret < 0)
2243 goto out_module_put;
2244
2245 if (ret > 0) {
2246 nla_nest_end(skb, nest);
2247 ret = skb->len;
2248 act_count = cb->args[1];
2249 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2250 cb->args[1] = 0;
2251 } else
2252 nlmsg_trim(skb, b);
2253
2254 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2255 if (NETLINK_CB(cb->skb).portid && ret)
2256 nlh->nlmsg_flags |= NLM_F_MULTI;
2257 module_put(a_o->owner);
2258 return skb->len;
2259
2260out_module_put:
2261 module_put(a_o->owner);
2262 nlmsg_trim(skb, b);
2263 return skb->len;
2264}
2265
2266static const struct rtnl_msg_handler tc_action_rtnl_msg_handlers[] __initconst = {
2267 {.msgtype = RTM_NEWACTION, .doit = tc_ctl_action},
2268 {.msgtype = RTM_DELACTION, .doit = tc_ctl_action},
2269 {.msgtype = RTM_GETACTION, .doit = tc_ctl_action,
2270 .dumpit = tc_dump_action},
2271};
2272
2273static int __init tc_action_init(void)
2274{
2275 rtnl_register_many(tc_action_rtnl_msg_handlers);
2276 return 0;
2277}
2278
2279subsys_initcall(tc_action_init);
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/act_api.h>
23#include <net/netlink.h>
24
25#ifdef CONFIG_INET
26DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
27EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
28#endif
29
30int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
31{
32#ifdef CONFIG_INET
33 if (static_branch_unlikely(&tcf_frag_xmit_count))
34 return sch_frag_xmit_hook(skb, xmit);
35#endif
36
37 return xmit(skb);
38}
39EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
40
41static void tcf_action_goto_chain_exec(const struct tc_action *a,
42 struct tcf_result *res)
43{
44 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
45
46 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
47}
48
49static void tcf_free_cookie_rcu(struct rcu_head *p)
50{
51 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
52
53 kfree(cookie->data);
54 kfree(cookie);
55}
56
57static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
58 struct tc_cookie *new_cookie)
59{
60 struct tc_cookie *old;
61
62 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
63 if (old)
64 call_rcu(&old->rcu, tcf_free_cookie_rcu);
65}
66
67int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
68 struct tcf_chain **newchain,
69 struct netlink_ext_ack *extack)
70{
71 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
72 u32 chain_index;
73
74 if (!opcode)
75 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
76 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
77 ret = 0;
78 if (ret) {
79 NL_SET_ERR_MSG(extack, "invalid control action");
80 goto end;
81 }
82
83 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
84 chain_index = action & TC_ACT_EXT_VAL_MASK;
85 if (!tp || !newchain) {
86 ret = -EINVAL;
87 NL_SET_ERR_MSG(extack,
88 "can't goto NULL proto/chain");
89 goto end;
90 }
91 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
92 if (!*newchain) {
93 ret = -ENOMEM;
94 NL_SET_ERR_MSG(extack,
95 "can't allocate goto_chain");
96 }
97 }
98end:
99 return ret;
100}
101EXPORT_SYMBOL(tcf_action_check_ctrlact);
102
103struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
104 struct tcf_chain *goto_chain)
105{
106 a->tcfa_action = action;
107 goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
108 return goto_chain;
109}
110EXPORT_SYMBOL(tcf_action_set_ctrlact);
111
112/* XXX: For standalone actions, we don't need a RCU grace period either, because
113 * actions are always connected to filters and filters are already destroyed in
114 * RCU callbacks, so after a RCU grace period actions are already disconnected
115 * from filters. Readers later can not find us.
116 */
117static void free_tcf(struct tc_action *p)
118{
119 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
120
121 free_percpu(p->cpu_bstats);
122 free_percpu(p->cpu_bstats_hw);
123 free_percpu(p->cpu_qstats);
124
125 tcf_set_action_cookie(&p->act_cookie, NULL);
126 if (chain)
127 tcf_chain_put_by_act(chain);
128
129 kfree(p);
130}
131
132static void tcf_action_cleanup(struct tc_action *p)
133{
134 if (p->ops->cleanup)
135 p->ops->cleanup(p);
136
137 gen_kill_estimator(&p->tcfa_rate_est);
138 free_tcf(p);
139}
140
141static int __tcf_action_put(struct tc_action *p, bool bind)
142{
143 struct tcf_idrinfo *idrinfo = p->idrinfo;
144
145 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
146 if (bind)
147 atomic_dec(&p->tcfa_bindcnt);
148 idr_remove(&idrinfo->action_idr, p->tcfa_index);
149 mutex_unlock(&idrinfo->lock);
150
151 tcf_action_cleanup(p);
152 return 1;
153 }
154
155 if (bind)
156 atomic_dec(&p->tcfa_bindcnt);
157
158 return 0;
159}
160
161static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
162{
163 int ret = 0;
164
165 /* Release with strict==1 and bind==0 is only called through act API
166 * interface (classifiers always bind). Only case when action with
167 * positive reference count and zero bind count can exist is when it was
168 * also created with act API (unbinding last classifier will destroy the
169 * action if it was created by classifier). So only case when bind count
170 * can be changed after initial check is when unbound action is
171 * destroyed by act API while classifier binds to action with same id
172 * concurrently. This result either creation of new action(same behavior
173 * as before), or reusing existing action if concurrent process
174 * increments reference count before action is deleted. Both scenarios
175 * are acceptable.
176 */
177 if (p) {
178 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
179 return -EPERM;
180
181 if (__tcf_action_put(p, bind))
182 ret = ACT_P_DELETED;
183 }
184
185 return ret;
186}
187
188int tcf_idr_release(struct tc_action *a, bool bind)
189{
190 const struct tc_action_ops *ops = a->ops;
191 int ret;
192
193 ret = __tcf_idr_release(a, bind, false);
194 if (ret == ACT_P_DELETED)
195 module_put(ops->owner);
196 return ret;
197}
198EXPORT_SYMBOL(tcf_idr_release);
199
200static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
201{
202 struct tc_cookie *act_cookie;
203 u32 cookie_len = 0;
204
205 rcu_read_lock();
206 act_cookie = rcu_dereference(act->act_cookie);
207
208 if (act_cookie)
209 cookie_len = nla_total_size(act_cookie->len);
210 rcu_read_unlock();
211
212 return nla_total_size(0) /* action number nested */
213 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
214 + cookie_len /* TCA_ACT_COOKIE */
215 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
216 + nla_total_size(0) /* TCA_ACT_STATS nested */
217 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
218 /* TCA_STATS_BASIC */
219 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
220 /* TCA_STATS_PKT64 */
221 + nla_total_size_64bit(sizeof(u64))
222 /* TCA_STATS_QUEUE */
223 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
224 + nla_total_size(0) /* TCA_OPTIONS nested */
225 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
226}
227
228static size_t tcf_action_full_attrs_size(size_t sz)
229{
230 return NLMSG_HDRLEN /* struct nlmsghdr */
231 + sizeof(struct tcamsg)
232 + nla_total_size(0) /* TCA_ACT_TAB nested */
233 + sz;
234}
235
236static size_t tcf_action_fill_size(const struct tc_action *act)
237{
238 size_t sz = tcf_action_shared_attrs_size(act);
239
240 if (act->ops->get_fill_size)
241 return act->ops->get_fill_size(act) + sz;
242 return sz;
243}
244
245static int
246tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
247{
248 unsigned char *b = skb_tail_pointer(skb);
249 struct tc_cookie *cookie;
250
251 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
252 goto nla_put_failure;
253 if (tcf_action_copy_stats(skb, a, 0))
254 goto nla_put_failure;
255 if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
256 goto nla_put_failure;
257
258 rcu_read_lock();
259 cookie = rcu_dereference(a->act_cookie);
260 if (cookie) {
261 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
262 rcu_read_unlock();
263 goto nla_put_failure;
264 }
265 }
266 rcu_read_unlock();
267
268 return 0;
269
270nla_put_failure:
271 nlmsg_trim(skb, b);
272 return -1;
273}
274
275static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
276 struct netlink_callback *cb)
277{
278 int err = 0, index = -1, s_i = 0, n_i = 0;
279 u32 act_flags = cb->args[2];
280 unsigned long jiffy_since = cb->args[3];
281 struct nlattr *nest;
282 struct idr *idr = &idrinfo->action_idr;
283 struct tc_action *p;
284 unsigned long id = 1;
285 unsigned long tmp;
286
287 mutex_lock(&idrinfo->lock);
288
289 s_i = cb->args[0];
290
291 idr_for_each_entry_ul(idr, p, tmp, id) {
292 index++;
293 if (index < s_i)
294 continue;
295 if (IS_ERR(p))
296 continue;
297
298 if (jiffy_since &&
299 time_after(jiffy_since,
300 (unsigned long)p->tcfa_tm.lastuse))
301 continue;
302
303 nest = nla_nest_start_noflag(skb, n_i);
304 if (!nest) {
305 index--;
306 goto nla_put_failure;
307 }
308 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
309 tcf_action_dump_terse(skb, p, true) :
310 tcf_action_dump_1(skb, p, 0, 0);
311 if (err < 0) {
312 index--;
313 nlmsg_trim(skb, nest);
314 goto done;
315 }
316 nla_nest_end(skb, nest);
317 n_i++;
318 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
319 n_i >= TCA_ACT_MAX_PRIO)
320 goto done;
321 }
322done:
323 if (index >= 0)
324 cb->args[0] = index + 1;
325
326 mutex_unlock(&idrinfo->lock);
327 if (n_i) {
328 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
329 cb->args[1] = n_i;
330 }
331 return n_i;
332
333nla_put_failure:
334 nla_nest_cancel(skb, nest);
335 goto done;
336}
337
338static int tcf_idr_release_unsafe(struct tc_action *p)
339{
340 if (atomic_read(&p->tcfa_bindcnt) > 0)
341 return -EPERM;
342
343 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
344 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
345 tcf_action_cleanup(p);
346 return ACT_P_DELETED;
347 }
348
349 return 0;
350}
351
352static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
353 const struct tc_action_ops *ops)
354{
355 struct nlattr *nest;
356 int n_i = 0;
357 int ret = -EINVAL;
358 struct idr *idr = &idrinfo->action_idr;
359 struct tc_action *p;
360 unsigned long id = 1;
361 unsigned long tmp;
362
363 nest = nla_nest_start_noflag(skb, 0);
364 if (nest == NULL)
365 goto nla_put_failure;
366 if (nla_put_string(skb, TCA_KIND, ops->kind))
367 goto nla_put_failure;
368
369 mutex_lock(&idrinfo->lock);
370 idr_for_each_entry_ul(idr, p, tmp, id) {
371 if (IS_ERR(p))
372 continue;
373 ret = tcf_idr_release_unsafe(p);
374 if (ret == ACT_P_DELETED) {
375 module_put(ops->owner);
376 n_i++;
377 } else if (ret < 0) {
378 mutex_unlock(&idrinfo->lock);
379 goto nla_put_failure;
380 }
381 }
382 mutex_unlock(&idrinfo->lock);
383
384 ret = nla_put_u32(skb, TCA_FCNT, n_i);
385 if (ret)
386 goto nla_put_failure;
387 nla_nest_end(skb, nest);
388
389 return n_i;
390nla_put_failure:
391 nla_nest_cancel(skb, nest);
392 return ret;
393}
394
395int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
396 struct netlink_callback *cb, int type,
397 const struct tc_action_ops *ops,
398 struct netlink_ext_ack *extack)
399{
400 struct tcf_idrinfo *idrinfo = tn->idrinfo;
401
402 if (type == RTM_DELACTION) {
403 return tcf_del_walker(idrinfo, skb, ops);
404 } else if (type == RTM_GETACTION) {
405 return tcf_dump_walker(idrinfo, skb, cb);
406 } else {
407 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
408 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
409 return -EINVAL;
410 }
411}
412EXPORT_SYMBOL(tcf_generic_walker);
413
414int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
415{
416 struct tcf_idrinfo *idrinfo = tn->idrinfo;
417 struct tc_action *p;
418
419 mutex_lock(&idrinfo->lock);
420 p = idr_find(&idrinfo->action_idr, index);
421 if (IS_ERR(p))
422 p = NULL;
423 else if (p)
424 refcount_inc(&p->tcfa_refcnt);
425 mutex_unlock(&idrinfo->lock);
426
427 if (p) {
428 *a = p;
429 return true;
430 }
431 return false;
432}
433EXPORT_SYMBOL(tcf_idr_search);
434
435static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
436{
437 struct tc_action *p;
438 int ret = 0;
439
440 mutex_lock(&idrinfo->lock);
441 p = idr_find(&idrinfo->action_idr, index);
442 if (!p) {
443 mutex_unlock(&idrinfo->lock);
444 return -ENOENT;
445 }
446
447 if (!atomic_read(&p->tcfa_bindcnt)) {
448 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
449 struct module *owner = p->ops->owner;
450
451 WARN_ON(p != idr_remove(&idrinfo->action_idr,
452 p->tcfa_index));
453 mutex_unlock(&idrinfo->lock);
454
455 tcf_action_cleanup(p);
456 module_put(owner);
457 return 0;
458 }
459 ret = 0;
460 } else {
461 ret = -EPERM;
462 }
463
464 mutex_unlock(&idrinfo->lock);
465 return ret;
466}
467
468int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
469 struct tc_action **a, const struct tc_action_ops *ops,
470 int bind, bool cpustats, u32 flags)
471{
472 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
473 struct tcf_idrinfo *idrinfo = tn->idrinfo;
474 int err = -ENOMEM;
475
476 if (unlikely(!p))
477 return -ENOMEM;
478 refcount_set(&p->tcfa_refcnt, 1);
479 if (bind)
480 atomic_set(&p->tcfa_bindcnt, 1);
481
482 if (cpustats) {
483 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
484 if (!p->cpu_bstats)
485 goto err1;
486 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
487 if (!p->cpu_bstats_hw)
488 goto err2;
489 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
490 if (!p->cpu_qstats)
491 goto err3;
492 }
493 spin_lock_init(&p->tcfa_lock);
494 p->tcfa_index = index;
495 p->tcfa_tm.install = jiffies;
496 p->tcfa_tm.lastuse = jiffies;
497 p->tcfa_tm.firstuse = 0;
498 p->tcfa_flags = flags;
499 if (est) {
500 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
501 &p->tcfa_rate_est,
502 &p->tcfa_lock, NULL, est);
503 if (err)
504 goto err4;
505 }
506
507 p->idrinfo = idrinfo;
508 __module_get(ops->owner);
509 p->ops = ops;
510 *a = p;
511 return 0;
512err4:
513 free_percpu(p->cpu_qstats);
514err3:
515 free_percpu(p->cpu_bstats_hw);
516err2:
517 free_percpu(p->cpu_bstats);
518err1:
519 kfree(p);
520 return err;
521}
522EXPORT_SYMBOL(tcf_idr_create);
523
524int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
525 struct nlattr *est, struct tc_action **a,
526 const struct tc_action_ops *ops, int bind,
527 u32 flags)
528{
529 /* Set cpustats according to actions flags. */
530 return tcf_idr_create(tn, index, est, a, ops, bind,
531 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
532}
533EXPORT_SYMBOL(tcf_idr_create_from_flags);
534
535/* Cleanup idr index that was allocated but not initialized. */
536
537void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
538{
539 struct tcf_idrinfo *idrinfo = tn->idrinfo;
540
541 mutex_lock(&idrinfo->lock);
542 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
543 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
544 mutex_unlock(&idrinfo->lock);
545}
546EXPORT_SYMBOL(tcf_idr_cleanup);
547
548/* Check if action with specified index exists. If actions is found, increments
549 * its reference and bind counters, and return 1. Otherwise insert temporary
550 * error pointer (to prevent concurrent users from inserting actions with same
551 * index) and return 0.
552 */
553
554int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
555 struct tc_action **a, int bind)
556{
557 struct tcf_idrinfo *idrinfo = tn->idrinfo;
558 struct tc_action *p;
559 int ret;
560
561again:
562 mutex_lock(&idrinfo->lock);
563 if (*index) {
564 p = idr_find(&idrinfo->action_idr, *index);
565 if (IS_ERR(p)) {
566 /* This means that another process allocated
567 * index but did not assign the pointer yet.
568 */
569 mutex_unlock(&idrinfo->lock);
570 goto again;
571 }
572
573 if (p) {
574 refcount_inc(&p->tcfa_refcnt);
575 if (bind)
576 atomic_inc(&p->tcfa_bindcnt);
577 *a = p;
578 ret = 1;
579 } else {
580 *a = NULL;
581 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
582 *index, GFP_KERNEL);
583 if (!ret)
584 idr_replace(&idrinfo->action_idr,
585 ERR_PTR(-EBUSY), *index);
586 }
587 } else {
588 *index = 1;
589 *a = NULL;
590 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
591 UINT_MAX, GFP_KERNEL);
592 if (!ret)
593 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
594 *index);
595 }
596 mutex_unlock(&idrinfo->lock);
597 return ret;
598}
599EXPORT_SYMBOL(tcf_idr_check_alloc);
600
601void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
602 struct tcf_idrinfo *idrinfo)
603{
604 struct idr *idr = &idrinfo->action_idr;
605 struct tc_action *p;
606 int ret;
607 unsigned long id = 1;
608 unsigned long tmp;
609
610 idr_for_each_entry_ul(idr, p, tmp, id) {
611 ret = __tcf_idr_release(p, false, true);
612 if (ret == ACT_P_DELETED)
613 module_put(ops->owner);
614 else if (ret < 0)
615 return;
616 }
617 idr_destroy(&idrinfo->action_idr);
618}
619EXPORT_SYMBOL(tcf_idrinfo_destroy);
620
621static LIST_HEAD(act_base);
622static DEFINE_RWLOCK(act_mod_lock);
623
624int tcf_register_action(struct tc_action_ops *act,
625 struct pernet_operations *ops)
626{
627 struct tc_action_ops *a;
628 int ret;
629
630 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
631 return -EINVAL;
632
633 /* We have to register pernet ops before making the action ops visible,
634 * otherwise tcf_action_init_1() could get a partially initialized
635 * netns.
636 */
637 ret = register_pernet_subsys(ops);
638 if (ret)
639 return ret;
640
641 write_lock(&act_mod_lock);
642 list_for_each_entry(a, &act_base, head) {
643 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
644 write_unlock(&act_mod_lock);
645 unregister_pernet_subsys(ops);
646 return -EEXIST;
647 }
648 }
649 list_add_tail(&act->head, &act_base);
650 write_unlock(&act_mod_lock);
651
652 return 0;
653}
654EXPORT_SYMBOL(tcf_register_action);
655
656int tcf_unregister_action(struct tc_action_ops *act,
657 struct pernet_operations *ops)
658{
659 struct tc_action_ops *a;
660 int err = -ENOENT;
661
662 write_lock(&act_mod_lock);
663 list_for_each_entry(a, &act_base, head) {
664 if (a == act) {
665 list_del(&act->head);
666 err = 0;
667 break;
668 }
669 }
670 write_unlock(&act_mod_lock);
671 if (!err)
672 unregister_pernet_subsys(ops);
673 return err;
674}
675EXPORT_SYMBOL(tcf_unregister_action);
676
677/* lookup by name */
678static struct tc_action_ops *tc_lookup_action_n(char *kind)
679{
680 struct tc_action_ops *a, *res = NULL;
681
682 if (kind) {
683 read_lock(&act_mod_lock);
684 list_for_each_entry(a, &act_base, head) {
685 if (strcmp(kind, a->kind) == 0) {
686 if (try_module_get(a->owner))
687 res = a;
688 break;
689 }
690 }
691 read_unlock(&act_mod_lock);
692 }
693 return res;
694}
695
696/* lookup by nlattr */
697static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
698{
699 struct tc_action_ops *a, *res = NULL;
700
701 if (kind) {
702 read_lock(&act_mod_lock);
703 list_for_each_entry(a, &act_base, head) {
704 if (nla_strcmp(kind, a->kind) == 0) {
705 if (try_module_get(a->owner))
706 res = a;
707 break;
708 }
709 }
710 read_unlock(&act_mod_lock);
711 }
712 return res;
713}
714
715/*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
716#define TCA_ACT_MAX_PRIO_MASK 0x1FF
717int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
718 int nr_actions, struct tcf_result *res)
719{
720 u32 jmp_prgcnt = 0;
721 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
722 int i;
723 int ret = TC_ACT_OK;
724
725 if (skb_skip_tc_classify(skb))
726 return TC_ACT_OK;
727
728restart_act_graph:
729 for (i = 0; i < nr_actions; i++) {
730 const struct tc_action *a = actions[i];
731
732 if (jmp_prgcnt > 0) {
733 jmp_prgcnt -= 1;
734 continue;
735 }
736repeat:
737 ret = a->ops->act(skb, a, res);
738 if (ret == TC_ACT_REPEAT)
739 goto repeat; /* we need a ttl - JHS */
740
741 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
742 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
743 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
744 /* faulty opcode, stop pipeline */
745 return TC_ACT_OK;
746 } else {
747 jmp_ttl -= 1;
748 if (jmp_ttl > 0)
749 goto restart_act_graph;
750 else /* faulty graph, stop pipeline */
751 return TC_ACT_OK;
752 }
753 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
754 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
755 net_warn_ratelimited("can't go to NULL chain!\n");
756 return TC_ACT_SHOT;
757 }
758 tcf_action_goto_chain_exec(a, res);
759 }
760
761 if (ret != TC_ACT_PIPE)
762 break;
763 }
764
765 return ret;
766}
767EXPORT_SYMBOL(tcf_action_exec);
768
769int tcf_action_destroy(struct tc_action *actions[], int bind)
770{
771 const struct tc_action_ops *ops;
772 struct tc_action *a;
773 int ret = 0, i;
774
775 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
776 a = actions[i];
777 actions[i] = NULL;
778 ops = a->ops;
779 ret = __tcf_idr_release(a, bind, true);
780 if (ret == ACT_P_DELETED)
781 module_put(ops->owner);
782 else if (ret < 0)
783 return ret;
784 }
785 return ret;
786}
787
788static int tcf_action_put(struct tc_action *p)
789{
790 return __tcf_action_put(p, false);
791}
792
793/* Put all actions in this array, skip those NULL's. */
794static void tcf_action_put_many(struct tc_action *actions[])
795{
796 int i;
797
798 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
799 struct tc_action *a = actions[i];
800 const struct tc_action_ops *ops;
801
802 if (!a)
803 continue;
804 ops = a->ops;
805 if (tcf_action_put(a))
806 module_put(ops->owner);
807 }
808}
809
810int
811tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
812{
813 return a->ops->dump(skb, a, bind, ref);
814}
815
816int
817tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
818{
819 int err = -EINVAL;
820 unsigned char *b = skb_tail_pointer(skb);
821 struct nlattr *nest;
822
823 if (tcf_action_dump_terse(skb, a, false))
824 goto nla_put_failure;
825
826 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
827 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
828 a->hw_stats, TCA_ACT_HW_STATS_ANY))
829 goto nla_put_failure;
830
831 if (a->used_hw_stats_valid &&
832 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
833 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
834 goto nla_put_failure;
835
836 if (a->tcfa_flags &&
837 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
838 a->tcfa_flags, a->tcfa_flags))
839 goto nla_put_failure;
840
841 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
842 if (nest == NULL)
843 goto nla_put_failure;
844 err = tcf_action_dump_old(skb, a, bind, ref);
845 if (err > 0) {
846 nla_nest_end(skb, nest);
847 return err;
848 }
849
850nla_put_failure:
851 nlmsg_trim(skb, b);
852 return -1;
853}
854EXPORT_SYMBOL(tcf_action_dump_1);
855
856int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
857 int bind, int ref, bool terse)
858{
859 struct tc_action *a;
860 int err = -EINVAL, i;
861 struct nlattr *nest;
862
863 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
864 a = actions[i];
865 nest = nla_nest_start_noflag(skb, i + 1);
866 if (nest == NULL)
867 goto nla_put_failure;
868 err = terse ? tcf_action_dump_terse(skb, a, false) :
869 tcf_action_dump_1(skb, a, bind, ref);
870 if (err < 0)
871 goto errout;
872 nla_nest_end(skb, nest);
873 }
874
875 return 0;
876
877nla_put_failure:
878 err = -EINVAL;
879errout:
880 nla_nest_cancel(skb, nest);
881 return err;
882}
883
884static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
885{
886 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
887 if (!c)
888 return NULL;
889
890 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
891 if (!c->data) {
892 kfree(c);
893 return NULL;
894 }
895 c->len = nla_len(tb[TCA_ACT_COOKIE]);
896
897 return c;
898}
899
900static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
901{
902 struct nla_bitfield32 hw_stats_bf;
903
904 /* If the user did not pass the attr, that means he does
905 * not care about the type. Return "any" in that case
906 * which is setting on all supported types.
907 */
908 if (!hw_stats_attr)
909 return TCA_ACT_HW_STATS_ANY;
910 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
911 return hw_stats_bf.value;
912}
913
914static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
915 [TCA_ACT_KIND] = { .type = NLA_STRING },
916 [TCA_ACT_INDEX] = { .type = NLA_U32 },
917 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
918 .len = TC_COOKIE_MAX_SIZE },
919 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
920 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS),
921 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
922};
923
924void tcf_idr_insert_many(struct tc_action *actions[])
925{
926 int i;
927
928 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
929 struct tc_action *a = actions[i];
930 struct tcf_idrinfo *idrinfo;
931
932 if (!a)
933 continue;
934 idrinfo = a->idrinfo;
935 mutex_lock(&idrinfo->lock);
936 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if
937 * it is just created, otherwise this is just a nop.
938 */
939 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
940 mutex_unlock(&idrinfo->lock);
941 }
942}
943
944struct tc_action_ops *tc_action_load_ops(char *name, struct nlattr *nla,
945 bool rtnl_held,
946 struct netlink_ext_ack *extack)
947{
948 struct nlattr *tb[TCA_ACT_MAX + 1];
949 struct tc_action_ops *a_o;
950 char act_name[IFNAMSIZ];
951 struct nlattr *kind;
952 int err;
953
954 if (name == NULL) {
955 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
956 tcf_action_policy, extack);
957 if (err < 0)
958 return ERR_PTR(err);
959 err = -EINVAL;
960 kind = tb[TCA_ACT_KIND];
961 if (!kind) {
962 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
963 return ERR_PTR(err);
964 }
965 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
966 NL_SET_ERR_MSG(extack, "TC action name too long");
967 return ERR_PTR(err);
968 }
969 } else {
970 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
971 NL_SET_ERR_MSG(extack, "TC action name too long");
972 return ERR_PTR(-EINVAL);
973 }
974 }
975
976 a_o = tc_lookup_action_n(act_name);
977 if (a_o == NULL) {
978#ifdef CONFIG_MODULES
979 if (rtnl_held)
980 rtnl_unlock();
981 request_module("act_%s", act_name);
982 if (rtnl_held)
983 rtnl_lock();
984
985 a_o = tc_lookup_action_n(act_name);
986
987 /* We dropped the RTNL semaphore in order to
988 * perform the module load. So, even if we
989 * succeeded in loading the module we have to
990 * tell the caller to replay the request. We
991 * indicate this using -EAGAIN.
992 */
993 if (a_o != NULL) {
994 module_put(a_o->owner);
995 return ERR_PTR(-EAGAIN);
996 }
997#endif
998 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
999 return ERR_PTR(-ENOENT);
1000 }
1001
1002 return a_o;
1003}
1004
1005struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1006 struct nlattr *nla, struct nlattr *est,
1007 char *name, int ovr, int bind,
1008 struct tc_action_ops *a_o, int *init_res,
1009 bool rtnl_held,
1010 struct netlink_ext_ack *extack)
1011{
1012 struct nla_bitfield32 flags = { 0, 0 };
1013 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1014 struct nlattr *tb[TCA_ACT_MAX + 1];
1015 struct tc_cookie *cookie = NULL;
1016 struct tc_action *a;
1017 int err;
1018
1019 /* backward compatibility for policer */
1020 if (name == NULL) {
1021 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1022 tcf_action_policy, extack);
1023 if (err < 0)
1024 return ERR_PTR(err);
1025 if (tb[TCA_ACT_COOKIE]) {
1026 cookie = nla_memdup_cookie(tb);
1027 if (!cookie) {
1028 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1029 err = -ENOMEM;
1030 goto err_out;
1031 }
1032 }
1033 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1034 if (tb[TCA_ACT_FLAGS])
1035 flags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1036
1037 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
1038 rtnl_held, tp, flags.value, extack);
1039 } else {
1040 err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
1041 tp, flags.value, extack);
1042 }
1043 if (err < 0)
1044 goto err_out;
1045 *init_res = err;
1046
1047 if (!name && tb[TCA_ACT_COOKIE])
1048 tcf_set_action_cookie(&a->act_cookie, cookie);
1049
1050 if (!name)
1051 a->hw_stats = hw_stats;
1052
1053 return a;
1054
1055err_out:
1056 if (cookie) {
1057 kfree(cookie->data);
1058 kfree(cookie);
1059 }
1060 return ERR_PTR(err);
1061}
1062
1063/* Returns numbers of initialized actions or negative error. */
1064
1065int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1066 struct nlattr *est, char *name, int ovr, int bind,
1067 struct tc_action *actions[], int init_res[], size_t *attr_size,
1068 bool rtnl_held, struct netlink_ext_ack *extack)
1069{
1070 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1071 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1072 struct tc_action *act;
1073 size_t sz = 0;
1074 int err;
1075 int i;
1076
1077 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1078 extack);
1079 if (err < 0)
1080 return err;
1081
1082 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1083 struct tc_action_ops *a_o;
1084
1085 a_o = tc_action_load_ops(name, tb[i], rtnl_held, extack);
1086 if (IS_ERR(a_o)) {
1087 err = PTR_ERR(a_o);
1088 goto err_mod;
1089 }
1090 ops[i - 1] = a_o;
1091 }
1092
1093 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1094 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
1095 ops[i - 1], &init_res[i - 1], rtnl_held,
1096 extack);
1097 if (IS_ERR(act)) {
1098 err = PTR_ERR(act);
1099 goto err;
1100 }
1101 sz += tcf_action_fill_size(act);
1102 /* Start from index 0 */
1103 actions[i - 1] = act;
1104 }
1105
1106 /* We have to commit them all together, because if any error happened in
1107 * between, we could not handle the failure gracefully.
1108 */
1109 tcf_idr_insert_many(actions);
1110
1111 *attr_size = tcf_action_full_attrs_size(sz);
1112 err = i - 1;
1113 goto err_mod;
1114
1115err:
1116 tcf_action_destroy(actions, bind);
1117err_mod:
1118 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1119 if (ops[i])
1120 module_put(ops[i]->owner);
1121 }
1122 return err;
1123}
1124
1125void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1126 u64 drops, bool hw)
1127{
1128 if (a->cpu_bstats) {
1129 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1130
1131 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1132
1133 if (hw)
1134 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
1135 bytes, packets);
1136 return;
1137 }
1138
1139 _bstats_update(&a->tcfa_bstats, bytes, packets);
1140 a->tcfa_qstats.drops += drops;
1141 if (hw)
1142 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1143}
1144EXPORT_SYMBOL(tcf_action_update_stats);
1145
1146int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1147 int compat_mode)
1148{
1149 int err = 0;
1150 struct gnet_dump d;
1151
1152 if (p == NULL)
1153 goto errout;
1154
1155 /* compat_mode being true specifies a call that is supposed
1156 * to add additional backward compatibility statistic TLVs.
1157 */
1158 if (compat_mode) {
1159 if (p->type == TCA_OLD_COMPAT)
1160 err = gnet_stats_start_copy_compat(skb, 0,
1161 TCA_STATS,
1162 TCA_XSTATS,
1163 &p->tcfa_lock, &d,
1164 TCA_PAD);
1165 else
1166 return 0;
1167 } else
1168 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1169 &p->tcfa_lock, &d, TCA_ACT_PAD);
1170
1171 if (err < 0)
1172 goto errout;
1173
1174 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
1175 gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
1176 &p->tcfa_bstats_hw) < 0 ||
1177 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1178 gnet_stats_copy_queue(&d, p->cpu_qstats,
1179 &p->tcfa_qstats,
1180 p->tcfa_qstats.qlen) < 0)
1181 goto errout;
1182
1183 if (gnet_stats_finish_copy(&d) < 0)
1184 goto errout;
1185
1186 return 0;
1187
1188errout:
1189 return -1;
1190}
1191
1192static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1193 u32 portid, u32 seq, u16 flags, int event, int bind,
1194 int ref)
1195{
1196 struct tcamsg *t;
1197 struct nlmsghdr *nlh;
1198 unsigned char *b = skb_tail_pointer(skb);
1199 struct nlattr *nest;
1200
1201 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1202 if (!nlh)
1203 goto out_nlmsg_trim;
1204 t = nlmsg_data(nlh);
1205 t->tca_family = AF_UNSPEC;
1206 t->tca__pad1 = 0;
1207 t->tca__pad2 = 0;
1208
1209 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1210 if (!nest)
1211 goto out_nlmsg_trim;
1212
1213 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1214 goto out_nlmsg_trim;
1215
1216 nla_nest_end(skb, nest);
1217
1218 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1219 return skb->len;
1220
1221out_nlmsg_trim:
1222 nlmsg_trim(skb, b);
1223 return -1;
1224}
1225
1226static int
1227tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1228 struct tc_action *actions[], int event,
1229 struct netlink_ext_ack *extack)
1230{
1231 struct sk_buff *skb;
1232
1233 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1234 if (!skb)
1235 return -ENOBUFS;
1236 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1237 0, 1) <= 0) {
1238 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1239 kfree_skb(skb);
1240 return -EINVAL;
1241 }
1242
1243 return rtnl_unicast(skb, net, portid);
1244}
1245
1246static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1247 struct nlmsghdr *n, u32 portid,
1248 struct netlink_ext_ack *extack)
1249{
1250 struct nlattr *tb[TCA_ACT_MAX + 1];
1251 const struct tc_action_ops *ops;
1252 struct tc_action *a;
1253 int index;
1254 int err;
1255
1256 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1257 tcf_action_policy, extack);
1258 if (err < 0)
1259 goto err_out;
1260
1261 err = -EINVAL;
1262 if (tb[TCA_ACT_INDEX] == NULL ||
1263 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1264 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1265 goto err_out;
1266 }
1267 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1268
1269 err = -EINVAL;
1270 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1271 if (!ops) { /* could happen in batch of actions */
1272 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1273 goto err_out;
1274 }
1275 err = -ENOENT;
1276 if (ops->lookup(net, &a, index) == 0) {
1277 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1278 goto err_mod;
1279 }
1280
1281 module_put(ops->owner);
1282 return a;
1283
1284err_mod:
1285 module_put(ops->owner);
1286err_out:
1287 return ERR_PTR(err);
1288}
1289
1290static int tca_action_flush(struct net *net, struct nlattr *nla,
1291 struct nlmsghdr *n, u32 portid,
1292 struct netlink_ext_ack *extack)
1293{
1294 struct sk_buff *skb;
1295 unsigned char *b;
1296 struct nlmsghdr *nlh;
1297 struct tcamsg *t;
1298 struct netlink_callback dcb;
1299 struct nlattr *nest;
1300 struct nlattr *tb[TCA_ACT_MAX + 1];
1301 const struct tc_action_ops *ops;
1302 struct nlattr *kind;
1303 int err = -ENOMEM;
1304
1305 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1306 if (!skb)
1307 return err;
1308
1309 b = skb_tail_pointer(skb);
1310
1311 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1312 tcf_action_policy, extack);
1313 if (err < 0)
1314 goto err_out;
1315
1316 err = -EINVAL;
1317 kind = tb[TCA_ACT_KIND];
1318 ops = tc_lookup_action(kind);
1319 if (!ops) { /*some idjot trying to flush unknown action */
1320 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1321 goto err_out;
1322 }
1323
1324 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1325 sizeof(*t), 0);
1326 if (!nlh) {
1327 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1328 goto out_module_put;
1329 }
1330 t = nlmsg_data(nlh);
1331 t->tca_family = AF_UNSPEC;
1332 t->tca__pad1 = 0;
1333 t->tca__pad2 = 0;
1334
1335 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1336 if (!nest) {
1337 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1338 goto out_module_put;
1339 }
1340
1341 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1342 if (err <= 0) {
1343 nla_nest_cancel(skb, nest);
1344 goto out_module_put;
1345 }
1346
1347 nla_nest_end(skb, nest);
1348
1349 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1350 nlh->nlmsg_flags |= NLM_F_ROOT;
1351 module_put(ops->owner);
1352 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1353 n->nlmsg_flags & NLM_F_ECHO);
1354 if (err > 0)
1355 return 0;
1356 if (err < 0)
1357 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1358
1359 return err;
1360
1361out_module_put:
1362 module_put(ops->owner);
1363err_out:
1364 kfree_skb(skb);
1365 return err;
1366}
1367
1368static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1369{
1370 int i;
1371
1372 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1373 struct tc_action *a = actions[i];
1374 const struct tc_action_ops *ops = a->ops;
1375 /* Actions can be deleted concurrently so we must save their
1376 * type and id to search again after reference is released.
1377 */
1378 struct tcf_idrinfo *idrinfo = a->idrinfo;
1379 u32 act_index = a->tcfa_index;
1380
1381 actions[i] = NULL;
1382 if (tcf_action_put(a)) {
1383 /* last reference, action was deleted concurrently */
1384 module_put(ops->owner);
1385 } else {
1386 int ret;
1387
1388 /* now do the delete */
1389 ret = tcf_idr_delete_index(idrinfo, act_index);
1390 if (ret < 0)
1391 return ret;
1392 }
1393 }
1394 return 0;
1395}
1396
1397static int
1398tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1399 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1400{
1401 int ret;
1402 struct sk_buff *skb;
1403
1404 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1405 GFP_KERNEL);
1406 if (!skb)
1407 return -ENOBUFS;
1408
1409 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1410 0, 2) <= 0) {
1411 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1412 kfree_skb(skb);
1413 return -EINVAL;
1414 }
1415
1416 /* now do the delete */
1417 ret = tcf_action_delete(net, actions);
1418 if (ret < 0) {
1419 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1420 kfree_skb(skb);
1421 return ret;
1422 }
1423
1424 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1425 n->nlmsg_flags & NLM_F_ECHO);
1426 if (ret > 0)
1427 return 0;
1428 return ret;
1429}
1430
1431static int
1432tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1433 u32 portid, int event, struct netlink_ext_ack *extack)
1434{
1435 int i, ret;
1436 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1437 struct tc_action *act;
1438 size_t attr_size = 0;
1439 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1440
1441 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1442 extack);
1443 if (ret < 0)
1444 return ret;
1445
1446 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1447 if (tb[1])
1448 return tca_action_flush(net, tb[1], n, portid, extack);
1449
1450 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1451 return -EINVAL;
1452 }
1453
1454 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1455 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1456 if (IS_ERR(act)) {
1457 ret = PTR_ERR(act);
1458 goto err;
1459 }
1460 attr_size += tcf_action_fill_size(act);
1461 actions[i - 1] = act;
1462 }
1463
1464 attr_size = tcf_action_full_attrs_size(attr_size);
1465
1466 if (event == RTM_GETACTION)
1467 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1468 else { /* delete */
1469 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1470 if (ret)
1471 goto err;
1472 return 0;
1473 }
1474err:
1475 tcf_action_put_many(actions);
1476 return ret;
1477}
1478
1479static int
1480tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1481 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1482{
1483 struct sk_buff *skb;
1484 int err = 0;
1485
1486 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1487 GFP_KERNEL);
1488 if (!skb)
1489 return -ENOBUFS;
1490
1491 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1492 RTM_NEWACTION, 0, 0) <= 0) {
1493 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1494 kfree_skb(skb);
1495 return -EINVAL;
1496 }
1497
1498 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1499 n->nlmsg_flags & NLM_F_ECHO);
1500 if (err > 0)
1501 err = 0;
1502 return err;
1503}
1504
1505static int tcf_action_add(struct net *net, struct nlattr *nla,
1506 struct nlmsghdr *n, u32 portid, int ovr,
1507 struct netlink_ext_ack *extack)
1508{
1509 size_t attr_size = 0;
1510 int loop, ret, i;
1511 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1512 int init_res[TCA_ACT_MAX_PRIO] = {};
1513
1514 for (loop = 0; loop < 10; loop++) {
1515 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0,
1516 actions, init_res, &attr_size, true, extack);
1517 if (ret != -EAGAIN)
1518 break;
1519 }
1520
1521 if (ret < 0)
1522 return ret;
1523 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1524
1525 /* only put existing actions */
1526 for (i = 0; i < TCA_ACT_MAX_PRIO; i++)
1527 if (init_res[i] == ACT_P_CREATED)
1528 actions[i] = NULL;
1529 tcf_action_put_many(actions);
1530
1531 return ret;
1532}
1533
1534static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1535 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
1536 TCA_ACT_FLAG_TERSE_DUMP),
1537 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1538};
1539
1540static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1541 struct netlink_ext_ack *extack)
1542{
1543 struct net *net = sock_net(skb->sk);
1544 struct nlattr *tca[TCA_ROOT_MAX + 1];
1545 u32 portid = NETLINK_CB(skb).portid;
1546 int ret = 0, ovr = 0;
1547
1548 if ((n->nlmsg_type != RTM_GETACTION) &&
1549 !netlink_capable(skb, CAP_NET_ADMIN))
1550 return -EPERM;
1551
1552 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
1553 TCA_ROOT_MAX, NULL, extack);
1554 if (ret < 0)
1555 return ret;
1556
1557 if (tca[TCA_ACT_TAB] == NULL) {
1558 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1559 return -EINVAL;
1560 }
1561
1562 /* n->nlmsg_flags & NLM_F_CREATE */
1563 switch (n->nlmsg_type) {
1564 case RTM_NEWACTION:
1565 /* we are going to assume all other flags
1566 * imply create only if it doesn't exist
1567 * Note that CREATE | EXCL implies that
1568 * but since we want avoid ambiguity (eg when flags
1569 * is zero) then just set this
1570 */
1571 if (n->nlmsg_flags & NLM_F_REPLACE)
1572 ovr = 1;
1573 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1574 extack);
1575 break;
1576 case RTM_DELACTION:
1577 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1578 portid, RTM_DELACTION, extack);
1579 break;
1580 case RTM_GETACTION:
1581 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1582 portid, RTM_GETACTION, extack);
1583 break;
1584 default:
1585 BUG();
1586 }
1587
1588 return ret;
1589}
1590
1591static struct nlattr *find_dump_kind(struct nlattr **nla)
1592{
1593 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1594 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1595 struct nlattr *kind;
1596
1597 tb1 = nla[TCA_ACT_TAB];
1598 if (tb1 == NULL)
1599 return NULL;
1600
1601 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1602 return NULL;
1603
1604 if (tb[1] == NULL)
1605 return NULL;
1606 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
1607 return NULL;
1608 kind = tb2[TCA_ACT_KIND];
1609
1610 return kind;
1611}
1612
1613static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1614{
1615 struct net *net = sock_net(skb->sk);
1616 struct nlmsghdr *nlh;
1617 unsigned char *b = skb_tail_pointer(skb);
1618 struct nlattr *nest;
1619 struct tc_action_ops *a_o;
1620 int ret = 0;
1621 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1622 struct nlattr *tb[TCA_ROOT_MAX + 1];
1623 struct nlattr *count_attr = NULL;
1624 unsigned long jiffy_since = 0;
1625 struct nlattr *kind = NULL;
1626 struct nla_bitfield32 bf;
1627 u32 msecs_since = 0;
1628 u32 act_count = 0;
1629
1630 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
1631 TCA_ROOT_MAX, tcaa_policy, cb->extack);
1632 if (ret < 0)
1633 return ret;
1634
1635 kind = find_dump_kind(tb);
1636 if (kind == NULL) {
1637 pr_info("tc_dump_action: action bad kind\n");
1638 return 0;
1639 }
1640
1641 a_o = tc_lookup_action(kind);
1642 if (a_o == NULL)
1643 return 0;
1644
1645 cb->args[2] = 0;
1646 if (tb[TCA_ROOT_FLAGS]) {
1647 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1648 cb->args[2] = bf.value;
1649 }
1650
1651 if (tb[TCA_ROOT_TIME_DELTA]) {
1652 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1653 }
1654
1655 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1656 cb->nlh->nlmsg_type, sizeof(*t), 0);
1657 if (!nlh)
1658 goto out_module_put;
1659
1660 if (msecs_since)
1661 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1662
1663 t = nlmsg_data(nlh);
1664 t->tca_family = AF_UNSPEC;
1665 t->tca__pad1 = 0;
1666 t->tca__pad2 = 0;
1667 cb->args[3] = jiffy_since;
1668 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1669 if (!count_attr)
1670 goto out_module_put;
1671
1672 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1673 if (nest == NULL)
1674 goto out_module_put;
1675
1676 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1677 if (ret < 0)
1678 goto out_module_put;
1679
1680 if (ret > 0) {
1681 nla_nest_end(skb, nest);
1682 ret = skb->len;
1683 act_count = cb->args[1];
1684 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1685 cb->args[1] = 0;
1686 } else
1687 nlmsg_trim(skb, b);
1688
1689 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1690 if (NETLINK_CB(cb->skb).portid && ret)
1691 nlh->nlmsg_flags |= NLM_F_MULTI;
1692 module_put(a_o->owner);
1693 return skb->len;
1694
1695out_module_put:
1696 module_put(a_o->owner);
1697 nlmsg_trim(skb, b);
1698 return skb->len;
1699}
1700
1701static int __init tc_action_init(void)
1702{
1703 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1704 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1705 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1706 0);
1707
1708 return 0;
1709}
1710
1711subsys_initcall(tc_action_init);