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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
25static void tcf_action_goto_chain_exec(const struct tc_action *a,
26 struct tcf_result *res)
27{
28 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
29
30 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
31}
32
33static void tcf_free_cookie_rcu(struct rcu_head *p)
34{
35 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
36
37 kfree(cookie->data);
38 kfree(cookie);
39}
40
41static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
42 struct tc_cookie *new_cookie)
43{
44 struct tc_cookie *old;
45
46 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
47 if (old)
48 call_rcu(&old->rcu, tcf_free_cookie_rcu);
49}
50
51int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
52 struct tcf_chain **newchain,
53 struct netlink_ext_ack *extack)
54{
55 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
56 u32 chain_index;
57
58 if (!opcode)
59 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
60 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
61 ret = 0;
62 if (ret) {
63 NL_SET_ERR_MSG(extack, "invalid control action");
64 goto end;
65 }
66
67 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
68 chain_index = action & TC_ACT_EXT_VAL_MASK;
69 if (!tp || !newchain) {
70 ret = -EINVAL;
71 NL_SET_ERR_MSG(extack,
72 "can't goto NULL proto/chain");
73 goto end;
74 }
75 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
76 if (!*newchain) {
77 ret = -ENOMEM;
78 NL_SET_ERR_MSG(extack,
79 "can't allocate goto_chain");
80 }
81 }
82end:
83 return ret;
84}
85EXPORT_SYMBOL(tcf_action_check_ctrlact);
86
87struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
88 struct tcf_chain *goto_chain)
89{
90 a->tcfa_action = action;
91 rcu_swap_protected(a->goto_chain, goto_chain, 1);
92 return goto_chain;
93}
94EXPORT_SYMBOL(tcf_action_set_ctrlact);
95
96
97
98
99
100
101static void free_tcf(struct tc_action *p)
102{
103 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
104
105 free_percpu(p->cpu_bstats);
106 free_percpu(p->cpu_bstats_hw);
107 free_percpu(p->cpu_qstats);
108
109 tcf_set_action_cookie(&p->act_cookie, NULL);
110 if (chain)
111 tcf_chain_put_by_act(chain);
112
113 kfree(p);
114}
115
116static void tcf_action_cleanup(struct tc_action *p)
117{
118 if (p->ops->cleanup)
119 p->ops->cleanup(p);
120
121 gen_kill_estimator(&p->tcfa_rate_est);
122 free_tcf(p);
123}
124
125static int __tcf_action_put(struct tc_action *p, bool bind)
126{
127 struct tcf_idrinfo *idrinfo = p->idrinfo;
128
129 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
130 if (bind)
131 atomic_dec(&p->tcfa_bindcnt);
132 idr_remove(&idrinfo->action_idr, p->tcfa_index);
133 mutex_unlock(&idrinfo->lock);
134
135 tcf_action_cleanup(p);
136 return 1;
137 }
138
139 if (bind)
140 atomic_dec(&p->tcfa_bindcnt);
141
142 return 0;
143}
144
145int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
146{
147 int ret = 0;
148
149
150
151
152
153
154
155
156
157
158
159
160
161 if (p) {
162 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
163 return -EPERM;
164
165 if (__tcf_action_put(p, bind))
166 ret = ACT_P_DELETED;
167 }
168
169 return ret;
170}
171EXPORT_SYMBOL(__tcf_idr_release);
172
173static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
174{
175 struct tc_cookie *act_cookie;
176 u32 cookie_len = 0;
177
178 rcu_read_lock();
179 act_cookie = rcu_dereference(act->act_cookie);
180
181 if (act_cookie)
182 cookie_len = nla_total_size(act_cookie->len);
183 rcu_read_unlock();
184
185 return nla_total_size(0)
186 + nla_total_size(IFNAMSIZ)
187 + cookie_len
188 + nla_total_size(0)
189
190 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
191
192 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
193 + nla_total_size(0)
194 + nla_total_size(sizeof(struct tcf_t));
195}
196
197static size_t tcf_action_full_attrs_size(size_t sz)
198{
199 return NLMSG_HDRLEN
200 + sizeof(struct tcamsg)
201 + nla_total_size(0)
202 + sz;
203}
204
205static size_t tcf_action_fill_size(const struct tc_action *act)
206{
207 size_t sz = tcf_action_shared_attrs_size(act);
208
209 if (act->ops->get_fill_size)
210 return act->ops->get_fill_size(act) + sz;
211 return sz;
212}
213
214static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
215 struct netlink_callback *cb)
216{
217 int err = 0, index = -1, s_i = 0, n_i = 0;
218 u32 act_flags = cb->args[2];
219 unsigned long jiffy_since = cb->args[3];
220 struct nlattr *nest;
221 struct idr *idr = &idrinfo->action_idr;
222 struct tc_action *p;
223 unsigned long id = 1;
224 unsigned long tmp;
225
226 mutex_lock(&idrinfo->lock);
227
228 s_i = cb->args[0];
229
230 idr_for_each_entry_ul(idr, p, tmp, id) {
231 index++;
232 if (index < s_i)
233 continue;
234
235 if (jiffy_since &&
236 time_after(jiffy_since,
237 (unsigned long)p->tcfa_tm.lastuse))
238 continue;
239
240 nest = nla_nest_start_noflag(skb, n_i);
241 if (!nest) {
242 index--;
243 goto nla_put_failure;
244 }
245 err = tcf_action_dump_1(skb, p, 0, 0);
246 if (err < 0) {
247 index--;
248 nlmsg_trim(skb, nest);
249 goto done;
250 }
251 nla_nest_end(skb, nest);
252 n_i++;
253 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
254 n_i >= TCA_ACT_MAX_PRIO)
255 goto done;
256 }
257done:
258 if (index >= 0)
259 cb->args[0] = index + 1;
260
261 mutex_unlock(&idrinfo->lock);
262 if (n_i) {
263 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
264 cb->args[1] = n_i;
265 }
266 return n_i;
267
268nla_put_failure:
269 nla_nest_cancel(skb, nest);
270 goto done;
271}
272
273static int tcf_idr_release_unsafe(struct tc_action *p)
274{
275 if (atomic_read(&p->tcfa_bindcnt) > 0)
276 return -EPERM;
277
278 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
279 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
280 tcf_action_cleanup(p);
281 return ACT_P_DELETED;
282 }
283
284 return 0;
285}
286
287static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
288 const struct tc_action_ops *ops)
289{
290 struct nlattr *nest;
291 int n_i = 0;
292 int ret = -EINVAL;
293 struct idr *idr = &idrinfo->action_idr;
294 struct tc_action *p;
295 unsigned long id = 1;
296 unsigned long tmp;
297
298 nest = nla_nest_start_noflag(skb, 0);
299 if (nest == NULL)
300 goto nla_put_failure;
301 if (nla_put_string(skb, TCA_KIND, ops->kind))
302 goto nla_put_failure;
303
304 mutex_lock(&idrinfo->lock);
305 idr_for_each_entry_ul(idr, p, tmp, id) {
306 ret = tcf_idr_release_unsafe(p);
307 if (ret == ACT_P_DELETED) {
308 module_put(ops->owner);
309 n_i++;
310 } else if (ret < 0) {
311 mutex_unlock(&idrinfo->lock);
312 goto nla_put_failure;
313 }
314 }
315 mutex_unlock(&idrinfo->lock);
316
317 if (nla_put_u32(skb, TCA_FCNT, n_i))
318 goto nla_put_failure;
319 nla_nest_end(skb, nest);
320
321 return n_i;
322nla_put_failure:
323 nla_nest_cancel(skb, nest);
324 return ret;
325}
326
327int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
328 struct netlink_callback *cb, int type,
329 const struct tc_action_ops *ops,
330 struct netlink_ext_ack *extack)
331{
332 struct tcf_idrinfo *idrinfo = tn->idrinfo;
333
334 if (type == RTM_DELACTION) {
335 return tcf_del_walker(idrinfo, skb, ops);
336 } else if (type == RTM_GETACTION) {
337 return tcf_dump_walker(idrinfo, skb, cb);
338 } else {
339 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
340 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
341 return -EINVAL;
342 }
343}
344EXPORT_SYMBOL(tcf_generic_walker);
345
346int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
347{
348 struct tcf_idrinfo *idrinfo = tn->idrinfo;
349 struct tc_action *p;
350
351 mutex_lock(&idrinfo->lock);
352 p = idr_find(&idrinfo->action_idr, index);
353 if (IS_ERR(p))
354 p = NULL;
355 else if (p)
356 refcount_inc(&p->tcfa_refcnt);
357 mutex_unlock(&idrinfo->lock);
358
359 if (p) {
360 *a = p;
361 return true;
362 }
363 return false;
364}
365EXPORT_SYMBOL(tcf_idr_search);
366
367static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
368{
369 struct tc_action *p;
370 int ret = 0;
371
372 mutex_lock(&idrinfo->lock);
373 p = idr_find(&idrinfo->action_idr, index);
374 if (!p) {
375 mutex_unlock(&idrinfo->lock);
376 return -ENOENT;
377 }
378
379 if (!atomic_read(&p->tcfa_bindcnt)) {
380 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
381 struct module *owner = p->ops->owner;
382
383 WARN_ON(p != idr_remove(&idrinfo->action_idr,
384 p->tcfa_index));
385 mutex_unlock(&idrinfo->lock);
386
387 tcf_action_cleanup(p);
388 module_put(owner);
389 return 0;
390 }
391 ret = 0;
392 } else {
393 ret = -EPERM;
394 }
395
396 mutex_unlock(&idrinfo->lock);
397 return ret;
398}
399
400int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
401 struct tc_action **a, const struct tc_action_ops *ops,
402 int bind, bool cpustats)
403{
404 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
405 struct tcf_idrinfo *idrinfo = tn->idrinfo;
406 int err = -ENOMEM;
407
408 if (unlikely(!p))
409 return -ENOMEM;
410 refcount_set(&p->tcfa_refcnt, 1);
411 if (bind)
412 atomic_set(&p->tcfa_bindcnt, 1);
413
414 if (cpustats) {
415 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
416 if (!p->cpu_bstats)
417 goto err1;
418 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
419 if (!p->cpu_bstats_hw)
420 goto err2;
421 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
422 if (!p->cpu_qstats)
423 goto err3;
424 }
425 spin_lock_init(&p->tcfa_lock);
426 p->tcfa_index = index;
427 p->tcfa_tm.install = jiffies;
428 p->tcfa_tm.lastuse = jiffies;
429 p->tcfa_tm.firstuse = 0;
430 if (est) {
431 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
432 &p->tcfa_rate_est,
433 &p->tcfa_lock, NULL, est);
434 if (err)
435 goto err4;
436 }
437
438 p->idrinfo = idrinfo;
439 p->ops = ops;
440 *a = p;
441 return 0;
442err4:
443 free_percpu(p->cpu_qstats);
444err3:
445 free_percpu(p->cpu_bstats_hw);
446err2:
447 free_percpu(p->cpu_bstats);
448err1:
449 kfree(p);
450 return err;
451}
452EXPORT_SYMBOL(tcf_idr_create);
453
454void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
455{
456 struct tcf_idrinfo *idrinfo = tn->idrinfo;
457
458 mutex_lock(&idrinfo->lock);
459
460 WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index)));
461 mutex_unlock(&idrinfo->lock);
462}
463EXPORT_SYMBOL(tcf_idr_insert);
464
465
466
467void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
468{
469 struct tcf_idrinfo *idrinfo = tn->idrinfo;
470
471 mutex_lock(&idrinfo->lock);
472
473 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
474 mutex_unlock(&idrinfo->lock);
475}
476EXPORT_SYMBOL(tcf_idr_cleanup);
477
478
479
480
481
482
483
484int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
485 struct tc_action **a, int bind)
486{
487 struct tcf_idrinfo *idrinfo = tn->idrinfo;
488 struct tc_action *p;
489 int ret;
490
491again:
492 mutex_lock(&idrinfo->lock);
493 if (*index) {
494 p = idr_find(&idrinfo->action_idr, *index);
495 if (IS_ERR(p)) {
496
497
498
499 mutex_unlock(&idrinfo->lock);
500 goto again;
501 }
502
503 if (p) {
504 refcount_inc(&p->tcfa_refcnt);
505 if (bind)
506 atomic_inc(&p->tcfa_bindcnt);
507 *a = p;
508 ret = 1;
509 } else {
510 *a = NULL;
511 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
512 *index, GFP_KERNEL);
513 if (!ret)
514 idr_replace(&idrinfo->action_idr,
515 ERR_PTR(-EBUSY), *index);
516 }
517 } else {
518 *index = 1;
519 *a = NULL;
520 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
521 UINT_MAX, GFP_KERNEL);
522 if (!ret)
523 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
524 *index);
525 }
526 mutex_unlock(&idrinfo->lock);
527 return ret;
528}
529EXPORT_SYMBOL(tcf_idr_check_alloc);
530
531void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
532 struct tcf_idrinfo *idrinfo)
533{
534 struct idr *idr = &idrinfo->action_idr;
535 struct tc_action *p;
536 int ret;
537 unsigned long id = 1;
538 unsigned long tmp;
539
540 idr_for_each_entry_ul(idr, p, tmp, id) {
541 ret = __tcf_idr_release(p, false, true);
542 if (ret == ACT_P_DELETED)
543 module_put(ops->owner);
544 else if (ret < 0)
545 return;
546 }
547 idr_destroy(&idrinfo->action_idr);
548}
549EXPORT_SYMBOL(tcf_idrinfo_destroy);
550
551static LIST_HEAD(act_base);
552static DEFINE_RWLOCK(act_mod_lock);
553
554int tcf_register_action(struct tc_action_ops *act,
555 struct pernet_operations *ops)
556{
557 struct tc_action_ops *a;
558 int ret;
559
560 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
561 return -EINVAL;
562
563
564
565
566
567 ret = register_pernet_subsys(ops);
568 if (ret)
569 return ret;
570
571 write_lock(&act_mod_lock);
572 list_for_each_entry(a, &act_base, head) {
573 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
574 write_unlock(&act_mod_lock);
575 unregister_pernet_subsys(ops);
576 return -EEXIST;
577 }
578 }
579 list_add_tail(&act->head, &act_base);
580 write_unlock(&act_mod_lock);
581
582 return 0;
583}
584EXPORT_SYMBOL(tcf_register_action);
585
586int tcf_unregister_action(struct tc_action_ops *act,
587 struct pernet_operations *ops)
588{
589 struct tc_action_ops *a;
590 int err = -ENOENT;
591
592 write_lock(&act_mod_lock);
593 list_for_each_entry(a, &act_base, head) {
594 if (a == act) {
595 list_del(&act->head);
596 err = 0;
597 break;
598 }
599 }
600 write_unlock(&act_mod_lock);
601 if (!err)
602 unregister_pernet_subsys(ops);
603 return err;
604}
605EXPORT_SYMBOL(tcf_unregister_action);
606
607
608static struct tc_action_ops *tc_lookup_action_n(char *kind)
609{
610 struct tc_action_ops *a, *res = NULL;
611
612 if (kind) {
613 read_lock(&act_mod_lock);
614 list_for_each_entry(a, &act_base, head) {
615 if (strcmp(kind, a->kind) == 0) {
616 if (try_module_get(a->owner))
617 res = a;
618 break;
619 }
620 }
621 read_unlock(&act_mod_lock);
622 }
623 return res;
624}
625
626
627static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
628{
629 struct tc_action_ops *a, *res = NULL;
630
631 if (kind) {
632 read_lock(&act_mod_lock);
633 list_for_each_entry(a, &act_base, head) {
634 if (nla_strcmp(kind, a->kind) == 0) {
635 if (try_module_get(a->owner))
636 res = a;
637 break;
638 }
639 }
640 read_unlock(&act_mod_lock);
641 }
642 return res;
643}
644
645
646#define TCA_ACT_MAX_PRIO_MASK 0x1FF
647int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
648 int nr_actions, struct tcf_result *res)
649{
650 u32 jmp_prgcnt = 0;
651 u32 jmp_ttl = TCA_ACT_MAX_PRIO;
652 int i;
653 int ret = TC_ACT_OK;
654
655 if (skb_skip_tc_classify(skb))
656 return TC_ACT_OK;
657
658restart_act_graph:
659 for (i = 0; i < nr_actions; i++) {
660 const struct tc_action *a = actions[i];
661
662 if (jmp_prgcnt > 0) {
663 jmp_prgcnt -= 1;
664 continue;
665 }
666repeat:
667 ret = a->ops->act(skb, a, res);
668 if (ret == TC_ACT_REPEAT)
669 goto repeat;
670
671 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
672 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
673 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
674
675 return TC_ACT_OK;
676 } else {
677 jmp_ttl -= 1;
678 if (jmp_ttl > 0)
679 goto restart_act_graph;
680 else
681 return TC_ACT_OK;
682 }
683 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
684 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
685 net_warn_ratelimited("can't go to NULL chain!\n");
686 return TC_ACT_SHOT;
687 }
688 tcf_action_goto_chain_exec(a, res);
689 }
690
691 if (ret != TC_ACT_PIPE)
692 break;
693 }
694
695 return ret;
696}
697EXPORT_SYMBOL(tcf_action_exec);
698
699int tcf_action_destroy(struct tc_action *actions[], int bind)
700{
701 const struct tc_action_ops *ops;
702 struct tc_action *a;
703 int ret = 0, i;
704
705 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
706 a = actions[i];
707 actions[i] = NULL;
708 ops = a->ops;
709 ret = __tcf_idr_release(a, bind, true);
710 if (ret == ACT_P_DELETED)
711 module_put(ops->owner);
712 else if (ret < 0)
713 return ret;
714 }
715 return ret;
716}
717
718static int tcf_action_destroy_1(struct tc_action *a, int bind)
719{
720 struct tc_action *actions[] = { a, NULL };
721
722 return tcf_action_destroy(actions, bind);
723}
724
725static int tcf_action_put(struct tc_action *p)
726{
727 return __tcf_action_put(p, false);
728}
729
730
731static void tcf_action_put_many(struct tc_action *actions[])
732{
733 int i;
734
735 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
736 struct tc_action *a = actions[i];
737 const struct tc_action_ops *ops;
738
739 if (!a)
740 continue;
741 ops = a->ops;
742 if (tcf_action_put(a))
743 module_put(ops->owner);
744 }
745}
746
747int
748tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
749{
750 return a->ops->dump(skb, a, bind, ref);
751}
752
753int
754tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
755{
756 int err = -EINVAL;
757 unsigned char *b = skb_tail_pointer(skb);
758 struct nlattr *nest;
759 struct tc_cookie *cookie;
760
761 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
762 goto nla_put_failure;
763 if (tcf_action_copy_stats(skb, a, 0))
764 goto nla_put_failure;
765
766 rcu_read_lock();
767 cookie = rcu_dereference(a->act_cookie);
768 if (cookie) {
769 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
770 rcu_read_unlock();
771 goto nla_put_failure;
772 }
773 }
774 rcu_read_unlock();
775
776 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
777 if (nest == NULL)
778 goto nla_put_failure;
779 err = tcf_action_dump_old(skb, a, bind, ref);
780 if (err > 0) {
781 nla_nest_end(skb, nest);
782 return err;
783 }
784
785nla_put_failure:
786 nlmsg_trim(skb, b);
787 return -1;
788}
789EXPORT_SYMBOL(tcf_action_dump_1);
790
791int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
792 int bind, int ref)
793{
794 struct tc_action *a;
795 int err = -EINVAL, i;
796 struct nlattr *nest;
797
798 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
799 a = actions[i];
800 nest = nla_nest_start_noflag(skb, i + 1);
801 if (nest == NULL)
802 goto nla_put_failure;
803 err = tcf_action_dump_1(skb, a, bind, ref);
804 if (err < 0)
805 goto errout;
806 nla_nest_end(skb, nest);
807 }
808
809 return 0;
810
811nla_put_failure:
812 err = -EINVAL;
813errout:
814 nla_nest_cancel(skb, nest);
815 return err;
816}
817
818static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
819{
820 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
821 if (!c)
822 return NULL;
823
824 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
825 if (!c->data) {
826 kfree(c);
827 return NULL;
828 }
829 c->len = nla_len(tb[TCA_ACT_COOKIE]);
830
831 return c;
832}
833
834struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
835 struct nlattr *nla, struct nlattr *est,
836 char *name, int ovr, int bind,
837 bool rtnl_held,
838 struct netlink_ext_ack *extack)
839{
840 struct tc_action *a;
841 struct tc_action_ops *a_o;
842 struct tc_cookie *cookie = NULL;
843 char act_name[IFNAMSIZ];
844 struct nlattr *tb[TCA_ACT_MAX + 1];
845 struct nlattr *kind;
846 int err;
847
848 if (name == NULL) {
849 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, NULL,
850 extack);
851 if (err < 0)
852 goto err_out;
853 err = -EINVAL;
854 kind = tb[TCA_ACT_KIND];
855 if (!kind) {
856 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
857 goto err_out;
858 }
859 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
860 NL_SET_ERR_MSG(extack, "TC action name too long");
861 goto err_out;
862 }
863 if (tb[TCA_ACT_COOKIE]) {
864 int cklen = nla_len(tb[TCA_ACT_COOKIE]);
865
866 if (cklen > TC_COOKIE_MAX_SIZE) {
867 NL_SET_ERR_MSG(extack, "TC cookie size above the maximum");
868 goto err_out;
869 }
870
871 cookie = nla_memdup_cookie(tb);
872 if (!cookie) {
873 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
874 err = -ENOMEM;
875 goto err_out;
876 }
877 }
878 } else {
879 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
880 NL_SET_ERR_MSG(extack, "TC action name too long");
881 err = -EINVAL;
882 goto err_out;
883 }
884 }
885
886 a_o = tc_lookup_action_n(act_name);
887 if (a_o == NULL) {
888#ifdef CONFIG_MODULES
889 if (rtnl_held)
890 rtnl_unlock();
891 request_module("act_%s", act_name);
892 if (rtnl_held)
893 rtnl_lock();
894
895 a_o = tc_lookup_action_n(act_name);
896
897
898
899
900
901
902
903 if (a_o != NULL) {
904 err = -EAGAIN;
905 goto err_mod;
906 }
907#endif
908 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
909 err = -ENOENT;
910 goto err_out;
911 }
912
913
914 if (name == NULL)
915 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
916 rtnl_held, tp, extack);
917 else
918 err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
919 tp, extack);
920 if (err < 0)
921 goto err_mod;
922
923 if (!name && tb[TCA_ACT_COOKIE])
924 tcf_set_action_cookie(&a->act_cookie, cookie);
925
926
927
928
929
930 if (err != ACT_P_CREATED)
931 module_put(a_o->owner);
932
933 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN) &&
934 !rcu_access_pointer(a->goto_chain)) {
935 tcf_action_destroy_1(a, bind);
936 NL_SET_ERR_MSG(extack, "can't use goto chain with NULL chain");
937 return ERR_PTR(-EINVAL);
938 }
939
940 return a;
941
942err_mod:
943 module_put(a_o->owner);
944err_out:
945 if (cookie) {
946 kfree(cookie->data);
947 kfree(cookie);
948 }
949 return ERR_PTR(err);
950}
951
952
953
954int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
955 struct nlattr *est, char *name, int ovr, int bind,
956 struct tc_action *actions[], size_t *attr_size,
957 bool rtnl_held, struct netlink_ext_ack *extack)
958{
959 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
960 struct tc_action *act;
961 size_t sz = 0;
962 int err;
963 int i;
964
965 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
966 extack);
967 if (err < 0)
968 return err;
969
970 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
971 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
972 rtnl_held, extack);
973 if (IS_ERR(act)) {
974 err = PTR_ERR(act);
975 goto err;
976 }
977 act->order = i;
978 sz += tcf_action_fill_size(act);
979
980 actions[i - 1] = act;
981 }
982
983 *attr_size = tcf_action_full_attrs_size(sz);
984 return i - 1;
985
986err:
987 tcf_action_destroy(actions, bind);
988 return err;
989}
990
991int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
992 int compat_mode)
993{
994 int err = 0;
995 struct gnet_dump d;
996
997 if (p == NULL)
998 goto errout;
999
1000
1001
1002
1003 if (compat_mode) {
1004 if (p->type == TCA_OLD_COMPAT)
1005 err = gnet_stats_start_copy_compat(skb, 0,
1006 TCA_STATS,
1007 TCA_XSTATS,
1008 &p->tcfa_lock, &d,
1009 TCA_PAD);
1010 else
1011 return 0;
1012 } else
1013 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1014 &p->tcfa_lock, &d, TCA_ACT_PAD);
1015
1016 if (err < 0)
1017 goto errout;
1018
1019 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
1020 gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
1021 &p->tcfa_bstats_hw) < 0 ||
1022 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1023 gnet_stats_copy_queue(&d, p->cpu_qstats,
1024 &p->tcfa_qstats,
1025 p->tcfa_qstats.qlen) < 0)
1026 goto errout;
1027
1028 if (gnet_stats_finish_copy(&d) < 0)
1029 goto errout;
1030
1031 return 0;
1032
1033errout:
1034 return -1;
1035}
1036
1037static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1038 u32 portid, u32 seq, u16 flags, int event, int bind,
1039 int ref)
1040{
1041 struct tcamsg *t;
1042 struct nlmsghdr *nlh;
1043 unsigned char *b = skb_tail_pointer(skb);
1044 struct nlattr *nest;
1045
1046 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1047 if (!nlh)
1048 goto out_nlmsg_trim;
1049 t = nlmsg_data(nlh);
1050 t->tca_family = AF_UNSPEC;
1051 t->tca__pad1 = 0;
1052 t->tca__pad2 = 0;
1053
1054 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1055 if (!nest)
1056 goto out_nlmsg_trim;
1057
1058 if (tcf_action_dump(skb, actions, bind, ref) < 0)
1059 goto out_nlmsg_trim;
1060
1061 nla_nest_end(skb, nest);
1062
1063 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1064 return skb->len;
1065
1066out_nlmsg_trim:
1067 nlmsg_trim(skb, b);
1068 return -1;
1069}
1070
1071static int
1072tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1073 struct tc_action *actions[], int event,
1074 struct netlink_ext_ack *extack)
1075{
1076 struct sk_buff *skb;
1077
1078 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1079 if (!skb)
1080 return -ENOBUFS;
1081 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1082 0, 1) <= 0) {
1083 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1084 kfree_skb(skb);
1085 return -EINVAL;
1086 }
1087
1088 return rtnl_unicast(skb, net, portid);
1089}
1090
1091static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1092 struct nlmsghdr *n, u32 portid,
1093 struct netlink_ext_ack *extack)
1094{
1095 struct nlattr *tb[TCA_ACT_MAX + 1];
1096 const struct tc_action_ops *ops;
1097 struct tc_action *a;
1098 int index;
1099 int err;
1100
1101 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, NULL, extack);
1102 if (err < 0)
1103 goto err_out;
1104
1105 err = -EINVAL;
1106 if (tb[TCA_ACT_INDEX] == NULL ||
1107 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1108 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1109 goto err_out;
1110 }
1111 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1112
1113 err = -EINVAL;
1114 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1115 if (!ops) {
1116 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1117 goto err_out;
1118 }
1119 err = -ENOENT;
1120 if (ops->lookup(net, &a, index) == 0) {
1121 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1122 goto err_mod;
1123 }
1124
1125 module_put(ops->owner);
1126 return a;
1127
1128err_mod:
1129 module_put(ops->owner);
1130err_out:
1131 return ERR_PTR(err);
1132}
1133
1134static int tca_action_flush(struct net *net, struct nlattr *nla,
1135 struct nlmsghdr *n, u32 portid,
1136 struct netlink_ext_ack *extack)
1137{
1138 struct sk_buff *skb;
1139 unsigned char *b;
1140 struct nlmsghdr *nlh;
1141 struct tcamsg *t;
1142 struct netlink_callback dcb;
1143 struct nlattr *nest;
1144 struct nlattr *tb[TCA_ACT_MAX + 1];
1145 const struct tc_action_ops *ops;
1146 struct nlattr *kind;
1147 int err = -ENOMEM;
1148
1149 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1150 if (!skb)
1151 return err;
1152
1153 b = skb_tail_pointer(skb);
1154
1155 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, NULL, extack);
1156 if (err < 0)
1157 goto err_out;
1158
1159 err = -EINVAL;
1160 kind = tb[TCA_ACT_KIND];
1161 ops = tc_lookup_action(kind);
1162 if (!ops) {
1163 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1164 goto err_out;
1165 }
1166
1167 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1168 sizeof(*t), 0);
1169 if (!nlh) {
1170 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1171 goto out_module_put;
1172 }
1173 t = nlmsg_data(nlh);
1174 t->tca_family = AF_UNSPEC;
1175 t->tca__pad1 = 0;
1176 t->tca__pad2 = 0;
1177
1178 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1179 if (!nest) {
1180 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1181 goto out_module_put;
1182 }
1183
1184 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1185 if (err <= 0) {
1186 nla_nest_cancel(skb, nest);
1187 goto out_module_put;
1188 }
1189
1190 nla_nest_end(skb, nest);
1191
1192 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1193 nlh->nlmsg_flags |= NLM_F_ROOT;
1194 module_put(ops->owner);
1195 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1196 n->nlmsg_flags & NLM_F_ECHO);
1197 if (err > 0)
1198 return 0;
1199 if (err < 0)
1200 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1201
1202 return err;
1203
1204out_module_put:
1205 module_put(ops->owner);
1206err_out:
1207 kfree_skb(skb);
1208 return err;
1209}
1210
1211static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1212{
1213 int i;
1214
1215 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1216 struct tc_action *a = actions[i];
1217 const struct tc_action_ops *ops = a->ops;
1218
1219
1220
1221 struct tcf_idrinfo *idrinfo = a->idrinfo;
1222 u32 act_index = a->tcfa_index;
1223
1224 actions[i] = NULL;
1225 if (tcf_action_put(a)) {
1226
1227 module_put(ops->owner);
1228 } else {
1229 int ret;
1230
1231
1232 ret = tcf_idr_delete_index(idrinfo, act_index);
1233 if (ret < 0)
1234 return ret;
1235 }
1236 }
1237 return 0;
1238}
1239
1240static int
1241tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1242 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1243{
1244 int ret;
1245 struct sk_buff *skb;
1246
1247 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1248 GFP_KERNEL);
1249 if (!skb)
1250 return -ENOBUFS;
1251
1252 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1253 0, 2) <= 0) {
1254 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1255 kfree_skb(skb);
1256 return -EINVAL;
1257 }
1258
1259
1260 ret = tcf_action_delete(net, actions);
1261 if (ret < 0) {
1262 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1263 kfree_skb(skb);
1264 return ret;
1265 }
1266
1267 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1268 n->nlmsg_flags & NLM_F_ECHO);
1269 if (ret > 0)
1270 return 0;
1271 return ret;
1272}
1273
1274static int
1275tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1276 u32 portid, int event, struct netlink_ext_ack *extack)
1277{
1278 int i, ret;
1279 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1280 struct tc_action *act;
1281 size_t attr_size = 0;
1282 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1283
1284 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1285 extack);
1286 if (ret < 0)
1287 return ret;
1288
1289 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1290 if (tb[1])
1291 return tca_action_flush(net, tb[1], n, portid, extack);
1292
1293 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1294 return -EINVAL;
1295 }
1296
1297 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1298 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1299 if (IS_ERR(act)) {
1300 ret = PTR_ERR(act);
1301 goto err;
1302 }
1303 attr_size += tcf_action_fill_size(act);
1304 actions[i - 1] = act;
1305 }
1306
1307 attr_size = tcf_action_full_attrs_size(attr_size);
1308
1309 if (event == RTM_GETACTION)
1310 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1311 else {
1312 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1313 if (ret)
1314 goto err;
1315 return 0;
1316 }
1317err:
1318 tcf_action_put_many(actions);
1319 return ret;
1320}
1321
1322static int
1323tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1324 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1325{
1326 struct sk_buff *skb;
1327 int err = 0;
1328
1329 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1330 GFP_KERNEL);
1331 if (!skb)
1332 return -ENOBUFS;
1333
1334 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1335 RTM_NEWACTION, 0, 0) <= 0) {
1336 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1337 kfree_skb(skb);
1338 return -EINVAL;
1339 }
1340
1341 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1342 n->nlmsg_flags & NLM_F_ECHO);
1343 if (err > 0)
1344 err = 0;
1345 return err;
1346}
1347
1348static int tcf_action_add(struct net *net, struct nlattr *nla,
1349 struct nlmsghdr *n, u32 portid, int ovr,
1350 struct netlink_ext_ack *extack)
1351{
1352 size_t attr_size = 0;
1353 int ret = 0;
1354 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1355
1356 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, actions,
1357 &attr_size, true, extack);
1358 if (ret < 0)
1359 return ret;
1360 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1361 if (ovr)
1362 tcf_action_put_many(actions);
1363
1364 return ret;
1365}
1366
1367static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1368static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1369 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1370 .validation_data = &tcaa_root_flags_allowed },
1371 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1372};
1373
1374static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1375 struct netlink_ext_ack *extack)
1376{
1377 struct net *net = sock_net(skb->sk);
1378 struct nlattr *tca[TCA_ROOT_MAX + 1];
1379 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1380 int ret = 0, ovr = 0;
1381
1382 if ((n->nlmsg_type != RTM_GETACTION) &&
1383 !netlink_capable(skb, CAP_NET_ADMIN))
1384 return -EPERM;
1385
1386 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
1387 TCA_ROOT_MAX, NULL, extack);
1388 if (ret < 0)
1389 return ret;
1390
1391 if (tca[TCA_ACT_TAB] == NULL) {
1392 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1393 return -EINVAL;
1394 }
1395
1396
1397 switch (n->nlmsg_type) {
1398 case RTM_NEWACTION:
1399
1400
1401
1402
1403
1404
1405 if (n->nlmsg_flags & NLM_F_REPLACE)
1406 ovr = 1;
1407replay:
1408 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1409 extack);
1410 if (ret == -EAGAIN)
1411 goto replay;
1412 break;
1413 case RTM_DELACTION:
1414 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1415 portid, RTM_DELACTION, extack);
1416 break;
1417 case RTM_GETACTION:
1418 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1419 portid, RTM_GETACTION, extack);
1420 break;
1421 default:
1422 BUG();
1423 }
1424
1425 return ret;
1426}
1427
1428static struct nlattr *find_dump_kind(struct nlattr **nla)
1429{
1430 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1431 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1432 struct nlattr *kind;
1433
1434 tb1 = nla[TCA_ACT_TAB];
1435 if (tb1 == NULL)
1436 return NULL;
1437
1438 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1439 return NULL;
1440
1441 if (tb[1] == NULL)
1442 return NULL;
1443 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
1444 return NULL;
1445 kind = tb2[TCA_ACT_KIND];
1446
1447 return kind;
1448}
1449
1450static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1451{
1452 struct net *net = sock_net(skb->sk);
1453 struct nlmsghdr *nlh;
1454 unsigned char *b = skb_tail_pointer(skb);
1455 struct nlattr *nest;
1456 struct tc_action_ops *a_o;
1457 int ret = 0;
1458 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1459 struct nlattr *tb[TCA_ROOT_MAX + 1];
1460 struct nlattr *count_attr = NULL;
1461 unsigned long jiffy_since = 0;
1462 struct nlattr *kind = NULL;
1463 struct nla_bitfield32 bf;
1464 u32 msecs_since = 0;
1465 u32 act_count = 0;
1466
1467 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
1468 TCA_ROOT_MAX, tcaa_policy, cb->extack);
1469 if (ret < 0)
1470 return ret;
1471
1472 kind = find_dump_kind(tb);
1473 if (kind == NULL) {
1474 pr_info("tc_dump_action: action bad kind\n");
1475 return 0;
1476 }
1477
1478 a_o = tc_lookup_action(kind);
1479 if (a_o == NULL)
1480 return 0;
1481
1482 cb->args[2] = 0;
1483 if (tb[TCA_ROOT_FLAGS]) {
1484 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1485 cb->args[2] = bf.value;
1486 }
1487
1488 if (tb[TCA_ROOT_TIME_DELTA]) {
1489 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1490 }
1491
1492 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1493 cb->nlh->nlmsg_type, sizeof(*t), 0);
1494 if (!nlh)
1495 goto out_module_put;
1496
1497 if (msecs_since)
1498 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1499
1500 t = nlmsg_data(nlh);
1501 t->tca_family = AF_UNSPEC;
1502 t->tca__pad1 = 0;
1503 t->tca__pad2 = 0;
1504 cb->args[3] = jiffy_since;
1505 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1506 if (!count_attr)
1507 goto out_module_put;
1508
1509 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1510 if (nest == NULL)
1511 goto out_module_put;
1512
1513 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1514 if (ret < 0)
1515 goto out_module_put;
1516
1517 if (ret > 0) {
1518 nla_nest_end(skb, nest);
1519 ret = skb->len;
1520 act_count = cb->args[1];
1521 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1522 cb->args[1] = 0;
1523 } else
1524 nlmsg_trim(skb, b);
1525
1526 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1527 if (NETLINK_CB(cb->skb).portid && ret)
1528 nlh->nlmsg_flags |= NLM_F_MULTI;
1529 module_put(a_o->owner);
1530 return skb->len;
1531
1532out_module_put:
1533 module_put(a_o->owner);
1534 nlmsg_trim(skb, b);
1535 return skb->len;
1536}
1537
1538static int __init tc_action_init(void)
1539{
1540 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1541 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1542 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1543 0);
1544
1545 return 0;
1546}
1547
1548subsys_initcall(tc_action_init);
1549