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Merge branch 'WIP.x86-pti.base-for-linus' of git://git.kernel.org/pub/scm/linux/kerne...
[mirror_ubuntu-bionic-kernel.git] / net / sched / act_api.c
1 /*
2 * net/sched/act_api.c Packet action API.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Author: Jamal Hadi Salim
10 *
11 *
12 */
13
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/init.h>
21 #include <linux/kmod.h>
22 #include <linux/err.h>
23 #include <linux/module.h>
24 #include <linux/rhashtable.h>
25 #include <linux/list.h>
26 #include <net/net_namespace.h>
27 #include <net/sock.h>
28 #include <net/sch_generic.h>
29 #include <net/pkt_cls.h>
30 #include <net/act_api.h>
31 #include <net/netlink.h>
32
33 static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp)
34 {
35 u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK;
36
37 if (!tp)
38 return -EINVAL;
39 a->goto_chain = tcf_chain_get(tp->chain->block, chain_index, true);
40 if (!a->goto_chain)
41 return -ENOMEM;
42 return 0;
43 }
44
45 static void tcf_action_goto_chain_fini(struct tc_action *a)
46 {
47 tcf_chain_put(a->goto_chain);
48 }
49
50 static void tcf_action_goto_chain_exec(const struct tc_action *a,
51 struct tcf_result *res)
52 {
53 const struct tcf_chain *chain = a->goto_chain;
54
55 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
56 }
57
58 /* XXX: For standalone actions, we don't need a RCU grace period either, because
59 * actions are always connected to filters and filters are already destroyed in
60 * RCU callbacks, so after a RCU grace period actions are already disconnected
61 * from filters. Readers later can not find us.
62 */
63 static void free_tcf(struct tc_action *p)
64 {
65 free_percpu(p->cpu_bstats);
66 free_percpu(p->cpu_qstats);
67
68 if (p->act_cookie) {
69 kfree(p->act_cookie->data);
70 kfree(p->act_cookie);
71 }
72 if (p->goto_chain)
73 tcf_action_goto_chain_fini(p);
74
75 kfree(p);
76 }
77
78 static void tcf_idr_remove(struct tcf_idrinfo *idrinfo, struct tc_action *p)
79 {
80 spin_lock_bh(&idrinfo->lock);
81 idr_remove_ext(&idrinfo->action_idr, p->tcfa_index);
82 spin_unlock_bh(&idrinfo->lock);
83 gen_kill_estimator(&p->tcfa_rate_est);
84 free_tcf(p);
85 }
86
87 int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
88 {
89 int ret = 0;
90
91 ASSERT_RTNL();
92
93 if (p) {
94 if (bind)
95 p->tcfa_bindcnt--;
96 else if (strict && p->tcfa_bindcnt > 0)
97 return -EPERM;
98
99 p->tcfa_refcnt--;
100 if (p->tcfa_bindcnt <= 0 && p->tcfa_refcnt <= 0) {
101 if (p->ops->cleanup)
102 p->ops->cleanup(p, bind);
103 tcf_idr_remove(p->idrinfo, p);
104 ret = ACT_P_DELETED;
105 }
106 }
107
108 return ret;
109 }
110 EXPORT_SYMBOL(__tcf_idr_release);
111
112 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
113 struct netlink_callback *cb)
114 {
115 int err = 0, index = -1, s_i = 0, n_i = 0;
116 u32 act_flags = cb->args[2];
117 unsigned long jiffy_since = cb->args[3];
118 struct nlattr *nest;
119 struct idr *idr = &idrinfo->action_idr;
120 struct tc_action *p;
121 unsigned long id = 1;
122
123 spin_lock_bh(&idrinfo->lock);
124
125 s_i = cb->args[0];
126
127 idr_for_each_entry_ext(idr, p, id) {
128 index++;
129 if (index < s_i)
130 continue;
131
132 if (jiffy_since &&
133 time_after(jiffy_since,
134 (unsigned long)p->tcfa_tm.lastuse))
135 continue;
136
137 nest = nla_nest_start(skb, n_i);
138 if (!nest)
139 goto nla_put_failure;
140 err = tcf_action_dump_1(skb, p, 0, 0);
141 if (err < 0) {
142 index--;
143 nlmsg_trim(skb, nest);
144 goto done;
145 }
146 nla_nest_end(skb, nest);
147 n_i++;
148 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
149 n_i >= TCA_ACT_MAX_PRIO)
150 goto done;
151 }
152 done:
153 if (index >= 0)
154 cb->args[0] = index + 1;
155
156 spin_unlock_bh(&idrinfo->lock);
157 if (n_i) {
158 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
159 cb->args[1] = n_i;
160 }
161 return n_i;
162
163 nla_put_failure:
164 nla_nest_cancel(skb, nest);
165 goto done;
166 }
167
168 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
169 const struct tc_action_ops *ops)
170 {
171 struct nlattr *nest;
172 int n_i = 0;
173 int ret = -EINVAL;
174 struct idr *idr = &idrinfo->action_idr;
175 struct tc_action *p;
176 unsigned long id = 1;
177
178 nest = nla_nest_start(skb, 0);
179 if (nest == NULL)
180 goto nla_put_failure;
181 if (nla_put_string(skb, TCA_KIND, ops->kind))
182 goto nla_put_failure;
183
184 idr_for_each_entry_ext(idr, p, id) {
185 ret = __tcf_idr_release(p, false, true);
186 if (ret == ACT_P_DELETED) {
187 module_put(ops->owner);
188 n_i++;
189 } else if (ret < 0) {
190 goto nla_put_failure;
191 }
192 }
193 if (nla_put_u32(skb, TCA_FCNT, n_i))
194 goto nla_put_failure;
195 nla_nest_end(skb, nest);
196
197 return n_i;
198 nla_put_failure:
199 nla_nest_cancel(skb, nest);
200 return ret;
201 }
202
203 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
204 struct netlink_callback *cb, int type,
205 const struct tc_action_ops *ops)
206 {
207 struct tcf_idrinfo *idrinfo = tn->idrinfo;
208
209 if (type == RTM_DELACTION) {
210 return tcf_del_walker(idrinfo, skb, ops);
211 } else if (type == RTM_GETACTION) {
212 return tcf_dump_walker(idrinfo, skb, cb);
213 } else {
214 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
215 return -EINVAL;
216 }
217 }
218 EXPORT_SYMBOL(tcf_generic_walker);
219
220 static struct tc_action *tcf_idr_lookup(u32 index, struct tcf_idrinfo *idrinfo)
221 {
222 struct tc_action *p = NULL;
223
224 spin_lock_bh(&idrinfo->lock);
225 p = idr_find_ext(&idrinfo->action_idr, index);
226 spin_unlock_bh(&idrinfo->lock);
227
228 return p;
229 }
230
231 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
232 {
233 struct tcf_idrinfo *idrinfo = tn->idrinfo;
234 struct tc_action *p = tcf_idr_lookup(index, idrinfo);
235
236 if (p) {
237 *a = p;
238 return 1;
239 }
240 return 0;
241 }
242 EXPORT_SYMBOL(tcf_idr_search);
243
244 bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
245 int bind)
246 {
247 struct tcf_idrinfo *idrinfo = tn->idrinfo;
248 struct tc_action *p = tcf_idr_lookup(index, idrinfo);
249
250 if (index && p) {
251 if (bind)
252 p->tcfa_bindcnt++;
253 p->tcfa_refcnt++;
254 *a = p;
255 return true;
256 }
257 return false;
258 }
259 EXPORT_SYMBOL(tcf_idr_check);
260
261 void tcf_idr_cleanup(struct tc_action *a, struct nlattr *est)
262 {
263 if (est)
264 gen_kill_estimator(&a->tcfa_rate_est);
265 free_tcf(a);
266 }
267 EXPORT_SYMBOL(tcf_idr_cleanup);
268
269 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
270 struct tc_action **a, const struct tc_action_ops *ops,
271 int bind, bool cpustats)
272 {
273 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
274 struct tcf_idrinfo *idrinfo = tn->idrinfo;
275 struct idr *idr = &idrinfo->action_idr;
276 int err = -ENOMEM;
277 unsigned long idr_index;
278
279 if (unlikely(!p))
280 return -ENOMEM;
281 p->tcfa_refcnt = 1;
282 if (bind)
283 p->tcfa_bindcnt = 1;
284
285 if (cpustats) {
286 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
287 if (!p->cpu_bstats) {
288 err1:
289 kfree(p);
290 return err;
291 }
292 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
293 if (!p->cpu_qstats) {
294 err2:
295 free_percpu(p->cpu_bstats);
296 goto err1;
297 }
298 }
299 spin_lock_init(&p->tcfa_lock);
300 /* user doesn't specify an index */
301 if (!index) {
302 idr_preload(GFP_KERNEL);
303 spin_lock_bh(&idrinfo->lock);
304 err = idr_alloc_ext(idr, NULL, &idr_index, 1, 0,
305 GFP_ATOMIC);
306 spin_unlock_bh(&idrinfo->lock);
307 idr_preload_end();
308 if (err) {
309 err3:
310 free_percpu(p->cpu_qstats);
311 goto err2;
312 }
313 p->tcfa_index = idr_index;
314 } else {
315 idr_preload(GFP_KERNEL);
316 spin_lock_bh(&idrinfo->lock);
317 err = idr_alloc_ext(idr, NULL, NULL, index, index + 1,
318 GFP_ATOMIC);
319 spin_unlock_bh(&idrinfo->lock);
320 idr_preload_end();
321 if (err)
322 goto err3;
323 p->tcfa_index = index;
324 }
325
326 p->tcfa_tm.install = jiffies;
327 p->tcfa_tm.lastuse = jiffies;
328 p->tcfa_tm.firstuse = 0;
329 if (est) {
330 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
331 &p->tcfa_rate_est,
332 &p->tcfa_lock, NULL, est);
333 if (err) {
334 goto err3;
335 }
336 }
337
338 p->idrinfo = idrinfo;
339 p->ops = ops;
340 INIT_LIST_HEAD(&p->list);
341 *a = p;
342 return 0;
343 }
344 EXPORT_SYMBOL(tcf_idr_create);
345
346 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
347 {
348 struct tcf_idrinfo *idrinfo = tn->idrinfo;
349
350 spin_lock_bh(&idrinfo->lock);
351 idr_replace_ext(&idrinfo->action_idr, a, a->tcfa_index);
352 spin_unlock_bh(&idrinfo->lock);
353 }
354 EXPORT_SYMBOL(tcf_idr_insert);
355
356 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
357 struct tcf_idrinfo *idrinfo)
358 {
359 struct idr *idr = &idrinfo->action_idr;
360 struct tc_action *p;
361 int ret;
362 unsigned long id = 1;
363
364 idr_for_each_entry_ext(idr, p, id) {
365 ret = __tcf_idr_release(p, false, true);
366 if (ret == ACT_P_DELETED)
367 module_put(ops->owner);
368 else if (ret < 0)
369 return;
370 }
371 idr_destroy(&idrinfo->action_idr);
372 }
373 EXPORT_SYMBOL(tcf_idrinfo_destroy);
374
375 static LIST_HEAD(act_base);
376 static DEFINE_RWLOCK(act_mod_lock);
377
378 int tcf_register_action(struct tc_action_ops *act,
379 struct pernet_operations *ops)
380 {
381 struct tc_action_ops *a;
382 int ret;
383
384 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
385 return -EINVAL;
386
387 /* We have to register pernet ops before making the action ops visible,
388 * otherwise tcf_action_init_1() could get a partially initialized
389 * netns.
390 */
391 ret = register_pernet_subsys(ops);
392 if (ret)
393 return ret;
394
395 write_lock(&act_mod_lock);
396 list_for_each_entry(a, &act_base, head) {
397 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
398 write_unlock(&act_mod_lock);
399 unregister_pernet_subsys(ops);
400 return -EEXIST;
401 }
402 }
403 list_add_tail(&act->head, &act_base);
404 write_unlock(&act_mod_lock);
405
406 return 0;
407 }
408 EXPORT_SYMBOL(tcf_register_action);
409
410 int tcf_unregister_action(struct tc_action_ops *act,
411 struct pernet_operations *ops)
412 {
413 struct tc_action_ops *a;
414 int err = -ENOENT;
415
416 write_lock(&act_mod_lock);
417 list_for_each_entry(a, &act_base, head) {
418 if (a == act) {
419 list_del(&act->head);
420 err = 0;
421 break;
422 }
423 }
424 write_unlock(&act_mod_lock);
425 if (!err)
426 unregister_pernet_subsys(ops);
427 return err;
428 }
429 EXPORT_SYMBOL(tcf_unregister_action);
430
431 /* lookup by name */
432 static struct tc_action_ops *tc_lookup_action_n(char *kind)
433 {
434 struct tc_action_ops *a, *res = NULL;
435
436 if (kind) {
437 read_lock(&act_mod_lock);
438 list_for_each_entry(a, &act_base, head) {
439 if (strcmp(kind, a->kind) == 0) {
440 if (try_module_get(a->owner))
441 res = a;
442 break;
443 }
444 }
445 read_unlock(&act_mod_lock);
446 }
447 return res;
448 }
449
450 /* lookup by nlattr */
451 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
452 {
453 struct tc_action_ops *a, *res = NULL;
454
455 if (kind) {
456 read_lock(&act_mod_lock);
457 list_for_each_entry(a, &act_base, head) {
458 if (nla_strcmp(kind, a->kind) == 0) {
459 if (try_module_get(a->owner))
460 res = a;
461 break;
462 }
463 }
464 read_unlock(&act_mod_lock);
465 }
466 return res;
467 }
468
469 /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
470 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
471 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
472 int nr_actions, struct tcf_result *res)
473 {
474 u32 jmp_prgcnt = 0;
475 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
476 int i;
477 int ret = TC_ACT_OK;
478
479 if (skb_skip_tc_classify(skb))
480 return TC_ACT_OK;
481
482 restart_act_graph:
483 for (i = 0; i < nr_actions; i++) {
484 const struct tc_action *a = actions[i];
485
486 if (jmp_prgcnt > 0) {
487 jmp_prgcnt -= 1;
488 continue;
489 }
490 repeat:
491 ret = a->ops->act(skb, a, res);
492 if (ret == TC_ACT_REPEAT)
493 goto repeat; /* we need a ttl - JHS */
494
495 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
496 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
497 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
498 /* faulty opcode, stop pipeline */
499 return TC_ACT_OK;
500 } else {
501 jmp_ttl -= 1;
502 if (jmp_ttl > 0)
503 goto restart_act_graph;
504 else /* faulty graph, stop pipeline */
505 return TC_ACT_OK;
506 }
507 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
508 tcf_action_goto_chain_exec(a, res);
509 }
510
511 if (ret != TC_ACT_PIPE)
512 break;
513 }
514
515 return ret;
516 }
517 EXPORT_SYMBOL(tcf_action_exec);
518
519 int tcf_action_destroy(struct list_head *actions, int bind)
520 {
521 const struct tc_action_ops *ops;
522 struct tc_action *a, *tmp;
523 int ret = 0;
524
525 list_for_each_entry_safe(a, tmp, actions, list) {
526 ops = a->ops;
527 ret = __tcf_idr_release(a, bind, true);
528 if (ret == ACT_P_DELETED)
529 module_put(ops->owner);
530 else if (ret < 0)
531 return ret;
532 }
533 return ret;
534 }
535
536 int
537 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
538 {
539 return a->ops->dump(skb, a, bind, ref);
540 }
541
542 int
543 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
544 {
545 int err = -EINVAL;
546 unsigned char *b = skb_tail_pointer(skb);
547 struct nlattr *nest;
548
549 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
550 goto nla_put_failure;
551 if (tcf_action_copy_stats(skb, a, 0))
552 goto nla_put_failure;
553 if (a->act_cookie) {
554 if (nla_put(skb, TCA_ACT_COOKIE, a->act_cookie->len,
555 a->act_cookie->data))
556 goto nla_put_failure;
557 }
558
559 nest = nla_nest_start(skb, TCA_OPTIONS);
560 if (nest == NULL)
561 goto nla_put_failure;
562 err = tcf_action_dump_old(skb, a, bind, ref);
563 if (err > 0) {
564 nla_nest_end(skb, nest);
565 return err;
566 }
567
568 nla_put_failure:
569 nlmsg_trim(skb, b);
570 return -1;
571 }
572 EXPORT_SYMBOL(tcf_action_dump_1);
573
574 int tcf_action_dump(struct sk_buff *skb, struct list_head *actions,
575 int bind, int ref)
576 {
577 struct tc_action *a;
578 int err = -EINVAL;
579 struct nlattr *nest;
580
581 list_for_each_entry(a, actions, list) {
582 nest = nla_nest_start(skb, a->order);
583 if (nest == NULL)
584 goto nla_put_failure;
585 err = tcf_action_dump_1(skb, a, bind, ref);
586 if (err < 0)
587 goto errout;
588 nla_nest_end(skb, nest);
589 }
590
591 return 0;
592
593 nla_put_failure:
594 err = -EINVAL;
595 errout:
596 nla_nest_cancel(skb, nest);
597 return err;
598 }
599
600 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
601 {
602 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
603 if (!c)
604 return NULL;
605
606 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
607 if (!c->data) {
608 kfree(c);
609 return NULL;
610 }
611 c->len = nla_len(tb[TCA_ACT_COOKIE]);
612
613 return c;
614 }
615
616 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
617 struct nlattr *nla, struct nlattr *est,
618 char *name, int ovr, int bind)
619 {
620 struct tc_action *a;
621 struct tc_action_ops *a_o;
622 struct tc_cookie *cookie = NULL;
623 char act_name[IFNAMSIZ];
624 struct nlattr *tb[TCA_ACT_MAX + 1];
625 struct nlattr *kind;
626 int err;
627
628 if (name == NULL) {
629 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
630 if (err < 0)
631 goto err_out;
632 err = -EINVAL;
633 kind = tb[TCA_ACT_KIND];
634 if (kind == NULL)
635 goto err_out;
636 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
637 goto err_out;
638 if (tb[TCA_ACT_COOKIE]) {
639 int cklen = nla_len(tb[TCA_ACT_COOKIE]);
640
641 if (cklen > TC_COOKIE_MAX_SIZE)
642 goto err_out;
643
644 cookie = nla_memdup_cookie(tb);
645 if (!cookie) {
646 err = -ENOMEM;
647 goto err_out;
648 }
649 }
650 } else {
651 err = -EINVAL;
652 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
653 goto err_out;
654 }
655
656 a_o = tc_lookup_action_n(act_name);
657 if (a_o == NULL) {
658 #ifdef CONFIG_MODULES
659 rtnl_unlock();
660 request_module("act_%s", act_name);
661 rtnl_lock();
662
663 a_o = tc_lookup_action_n(act_name);
664
665 /* We dropped the RTNL semaphore in order to
666 * perform the module load. So, even if we
667 * succeeded in loading the module we have to
668 * tell the caller to replay the request. We
669 * indicate this using -EAGAIN.
670 */
671 if (a_o != NULL) {
672 err = -EAGAIN;
673 goto err_mod;
674 }
675 #endif
676 err = -ENOENT;
677 goto err_out;
678 }
679
680 /* backward compatibility for policer */
681 if (name == NULL)
682 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind);
683 else
684 err = a_o->init(net, nla, est, &a, ovr, bind);
685 if (err < 0)
686 goto err_mod;
687
688 if (name == NULL && tb[TCA_ACT_COOKIE]) {
689 if (a->act_cookie) {
690 kfree(a->act_cookie->data);
691 kfree(a->act_cookie);
692 }
693 a->act_cookie = cookie;
694 }
695
696 /* module count goes up only when brand new policy is created
697 * if it exists and is only bound to in a_o->init() then
698 * ACT_P_CREATED is not returned (a zero is).
699 */
700 if (err != ACT_P_CREATED)
701 module_put(a_o->owner);
702
703 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) {
704 err = tcf_action_goto_chain_init(a, tp);
705 if (err) {
706 LIST_HEAD(actions);
707
708 list_add_tail(&a->list, &actions);
709 tcf_action_destroy(&actions, bind);
710 return ERR_PTR(err);
711 }
712 }
713
714 return a;
715
716 err_mod:
717 module_put(a_o->owner);
718 err_out:
719 if (cookie) {
720 kfree(cookie->data);
721 kfree(cookie);
722 }
723 return ERR_PTR(err);
724 }
725
726 static void cleanup_a(struct list_head *actions, int ovr)
727 {
728 struct tc_action *a;
729
730 if (!ovr)
731 return;
732
733 list_for_each_entry(a, actions, list)
734 a->tcfa_refcnt--;
735 }
736
737 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
738 struct nlattr *est, char *name, int ovr, int bind,
739 struct list_head *actions)
740 {
741 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
742 struct tc_action *act;
743 int err;
744 int i;
745
746 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
747 if (err < 0)
748 return err;
749
750 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
751 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind);
752 if (IS_ERR(act)) {
753 err = PTR_ERR(act);
754 goto err;
755 }
756 act->order = i;
757 if (ovr)
758 act->tcfa_refcnt++;
759 list_add_tail(&act->list, actions);
760 }
761
762 /* Remove the temp refcnt which was necessary to protect against
763 * destroying an existing action which was being replaced
764 */
765 cleanup_a(actions, ovr);
766 return 0;
767
768 err:
769 tcf_action_destroy(actions, bind);
770 return err;
771 }
772
773 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
774 int compat_mode)
775 {
776 int err = 0;
777 struct gnet_dump d;
778
779 if (p == NULL)
780 goto errout;
781
782 /* compat_mode being true specifies a call that is supposed
783 * to add additional backward compatibility statistic TLVs.
784 */
785 if (compat_mode) {
786 if (p->type == TCA_OLD_COMPAT)
787 err = gnet_stats_start_copy_compat(skb, 0,
788 TCA_STATS,
789 TCA_XSTATS,
790 &p->tcfa_lock, &d,
791 TCA_PAD);
792 else
793 return 0;
794 } else
795 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
796 &p->tcfa_lock, &d, TCA_ACT_PAD);
797
798 if (err < 0)
799 goto errout;
800
801 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
802 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
803 gnet_stats_copy_queue(&d, p->cpu_qstats,
804 &p->tcfa_qstats,
805 p->tcfa_qstats.qlen) < 0)
806 goto errout;
807
808 if (gnet_stats_finish_copy(&d) < 0)
809 goto errout;
810
811 return 0;
812
813 errout:
814 return -1;
815 }
816
817 static int tca_get_fill(struct sk_buff *skb, struct list_head *actions,
818 u32 portid, u32 seq, u16 flags, int event, int bind,
819 int ref)
820 {
821 struct tcamsg *t;
822 struct nlmsghdr *nlh;
823 unsigned char *b = skb_tail_pointer(skb);
824 struct nlattr *nest;
825
826 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
827 if (!nlh)
828 goto out_nlmsg_trim;
829 t = nlmsg_data(nlh);
830 t->tca_family = AF_UNSPEC;
831 t->tca__pad1 = 0;
832 t->tca__pad2 = 0;
833
834 nest = nla_nest_start(skb, TCA_ACT_TAB);
835 if (nest == NULL)
836 goto out_nlmsg_trim;
837
838 if (tcf_action_dump(skb, actions, bind, ref) < 0)
839 goto out_nlmsg_trim;
840
841 nla_nest_end(skb, nest);
842
843 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
844 return skb->len;
845
846 out_nlmsg_trim:
847 nlmsg_trim(skb, b);
848 return -1;
849 }
850
851 static int
852 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
853 struct list_head *actions, int event)
854 {
855 struct sk_buff *skb;
856
857 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
858 if (!skb)
859 return -ENOBUFS;
860 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
861 0, 0) <= 0) {
862 kfree_skb(skb);
863 return -EINVAL;
864 }
865
866 return rtnl_unicast(skb, net, portid);
867 }
868
869 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
870 struct nlmsghdr *n, u32 portid)
871 {
872 struct nlattr *tb[TCA_ACT_MAX + 1];
873 const struct tc_action_ops *ops;
874 struct tc_action *a;
875 int index;
876 int err;
877
878 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
879 if (err < 0)
880 goto err_out;
881
882 err = -EINVAL;
883 if (tb[TCA_ACT_INDEX] == NULL ||
884 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
885 goto err_out;
886 index = nla_get_u32(tb[TCA_ACT_INDEX]);
887
888 err = -EINVAL;
889 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
890 if (!ops) /* could happen in batch of actions */
891 goto err_out;
892 err = -ENOENT;
893 if (ops->lookup(net, &a, index) == 0)
894 goto err_mod;
895
896 module_put(ops->owner);
897 return a;
898
899 err_mod:
900 module_put(ops->owner);
901 err_out:
902 return ERR_PTR(err);
903 }
904
905 static int tca_action_flush(struct net *net, struct nlattr *nla,
906 struct nlmsghdr *n, u32 portid)
907 {
908 struct sk_buff *skb;
909 unsigned char *b;
910 struct nlmsghdr *nlh;
911 struct tcamsg *t;
912 struct netlink_callback dcb;
913 struct nlattr *nest;
914 struct nlattr *tb[TCA_ACT_MAX + 1];
915 const struct tc_action_ops *ops;
916 struct nlattr *kind;
917 int err = -ENOMEM;
918
919 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
920 if (!skb) {
921 pr_debug("tca_action_flush: failed skb alloc\n");
922 return err;
923 }
924
925 b = skb_tail_pointer(skb);
926
927 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL);
928 if (err < 0)
929 goto err_out;
930
931 err = -EINVAL;
932 kind = tb[TCA_ACT_KIND];
933 ops = tc_lookup_action(kind);
934 if (!ops) /*some idjot trying to flush unknown action */
935 goto err_out;
936
937 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
938 sizeof(*t), 0);
939 if (!nlh)
940 goto out_module_put;
941 t = nlmsg_data(nlh);
942 t->tca_family = AF_UNSPEC;
943 t->tca__pad1 = 0;
944 t->tca__pad2 = 0;
945
946 nest = nla_nest_start(skb, TCA_ACT_TAB);
947 if (nest == NULL)
948 goto out_module_put;
949
950 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops);
951 if (err <= 0)
952 goto out_module_put;
953
954 nla_nest_end(skb, nest);
955
956 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
957 nlh->nlmsg_flags |= NLM_F_ROOT;
958 module_put(ops->owner);
959 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
960 n->nlmsg_flags & NLM_F_ECHO);
961 if (err > 0)
962 return 0;
963
964 return err;
965
966 out_module_put:
967 module_put(ops->owner);
968 err_out:
969 kfree_skb(skb);
970 return err;
971 }
972
973 static int
974 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
975 u32 portid)
976 {
977 int ret;
978 struct sk_buff *skb;
979
980 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
981 if (!skb)
982 return -ENOBUFS;
983
984 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
985 0, 1) <= 0) {
986 kfree_skb(skb);
987 return -EINVAL;
988 }
989
990 /* now do the delete */
991 ret = tcf_action_destroy(actions, 0);
992 if (ret < 0) {
993 kfree_skb(skb);
994 return ret;
995 }
996
997 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
998 n->nlmsg_flags & NLM_F_ECHO);
999 if (ret > 0)
1000 return 0;
1001 return ret;
1002 }
1003
1004 static int
1005 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1006 u32 portid, int event)
1007 {
1008 int i, ret;
1009 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1010 struct tc_action *act;
1011 LIST_HEAD(actions);
1012
1013 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL);
1014 if (ret < 0)
1015 return ret;
1016
1017 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1018 if (tb[1] != NULL)
1019 return tca_action_flush(net, tb[1], n, portid);
1020 else
1021 return -EINVAL;
1022 }
1023
1024 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1025 act = tcf_action_get_1(net, tb[i], n, portid);
1026 if (IS_ERR(act)) {
1027 ret = PTR_ERR(act);
1028 goto err;
1029 }
1030 act->order = i;
1031 list_add_tail(&act->list, &actions);
1032 }
1033
1034 if (event == RTM_GETACTION)
1035 ret = tcf_get_notify(net, portid, n, &actions, event);
1036 else { /* delete */
1037 ret = tcf_del_notify(net, n, &actions, portid);
1038 if (ret)
1039 goto err;
1040 return ret;
1041 }
1042 err:
1043 if (event != RTM_GETACTION)
1044 tcf_action_destroy(&actions, 0);
1045 return ret;
1046 }
1047
1048 static int
1049 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
1050 u32 portid)
1051 {
1052 struct sk_buff *skb;
1053 int err = 0;
1054
1055 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1056 if (!skb)
1057 return -ENOBUFS;
1058
1059 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1060 RTM_NEWACTION, 0, 0) <= 0) {
1061 kfree_skb(skb);
1062 return -EINVAL;
1063 }
1064
1065 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1066 n->nlmsg_flags & NLM_F_ECHO);
1067 if (err > 0)
1068 err = 0;
1069 return err;
1070 }
1071
1072 static int tcf_action_add(struct net *net, struct nlattr *nla,
1073 struct nlmsghdr *n, u32 portid, int ovr)
1074 {
1075 int ret = 0;
1076 LIST_HEAD(actions);
1077
1078 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, &actions);
1079 if (ret)
1080 return ret;
1081
1082 return tcf_add_notify(net, n, &actions, portid);
1083 }
1084
1085 static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1086 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1087 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1088 .validation_data = &tcaa_root_flags_allowed },
1089 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1090 };
1091
1092 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1093 struct netlink_ext_ack *extack)
1094 {
1095 struct net *net = sock_net(skb->sk);
1096 struct nlattr *tca[TCA_ROOT_MAX + 1];
1097 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1098 int ret = 0, ovr = 0;
1099
1100 if ((n->nlmsg_type != RTM_GETACTION) &&
1101 !netlink_capable(skb, CAP_NET_ADMIN))
1102 return -EPERM;
1103
1104 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ROOT_MAX, NULL,
1105 extack);
1106 if (ret < 0)
1107 return ret;
1108
1109 if (tca[TCA_ACT_TAB] == NULL) {
1110 pr_notice("tc_ctl_action: received NO action attribs\n");
1111 return -EINVAL;
1112 }
1113
1114 /* n->nlmsg_flags & NLM_F_CREATE */
1115 switch (n->nlmsg_type) {
1116 case RTM_NEWACTION:
1117 /* we are going to assume all other flags
1118 * imply create only if it doesn't exist
1119 * Note that CREATE | EXCL implies that
1120 * but since we want avoid ambiguity (eg when flags
1121 * is zero) then just set this
1122 */
1123 if (n->nlmsg_flags & NLM_F_REPLACE)
1124 ovr = 1;
1125 replay:
1126 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
1127 if (ret == -EAGAIN)
1128 goto replay;
1129 break;
1130 case RTM_DELACTION:
1131 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1132 portid, RTM_DELACTION);
1133 break;
1134 case RTM_GETACTION:
1135 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1136 portid, RTM_GETACTION);
1137 break;
1138 default:
1139 BUG();
1140 }
1141
1142 return ret;
1143 }
1144
1145 static struct nlattr *find_dump_kind(struct nlattr **nla)
1146 {
1147 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1148 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1149 struct nlattr *kind;
1150
1151 tb1 = nla[TCA_ACT_TAB];
1152 if (tb1 == NULL)
1153 return NULL;
1154
1155 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1156 NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1157 return NULL;
1158
1159 if (tb[1] == NULL)
1160 return NULL;
1161 if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
1162 return NULL;
1163 kind = tb2[TCA_ACT_KIND];
1164
1165 return kind;
1166 }
1167
1168 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1169 {
1170 struct net *net = sock_net(skb->sk);
1171 struct nlmsghdr *nlh;
1172 unsigned char *b = skb_tail_pointer(skb);
1173 struct nlattr *nest;
1174 struct tc_action_ops *a_o;
1175 int ret = 0;
1176 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1177 struct nlattr *tb[TCA_ROOT_MAX + 1];
1178 struct nlattr *count_attr = NULL;
1179 unsigned long jiffy_since = 0;
1180 struct nlattr *kind = NULL;
1181 struct nla_bitfield32 bf;
1182 u32 msecs_since = 0;
1183 u32 act_count = 0;
1184
1185 ret = nlmsg_parse(cb->nlh, sizeof(struct tcamsg), tb, TCA_ROOT_MAX,
1186 tcaa_policy, NULL);
1187 if (ret < 0)
1188 return ret;
1189
1190 kind = find_dump_kind(tb);
1191 if (kind == NULL) {
1192 pr_info("tc_dump_action: action bad kind\n");
1193 return 0;
1194 }
1195
1196 a_o = tc_lookup_action(kind);
1197 if (a_o == NULL)
1198 return 0;
1199
1200 cb->args[2] = 0;
1201 if (tb[TCA_ROOT_FLAGS]) {
1202 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1203 cb->args[2] = bf.value;
1204 }
1205
1206 if (tb[TCA_ROOT_TIME_DELTA]) {
1207 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1208 }
1209
1210 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1211 cb->nlh->nlmsg_type, sizeof(*t), 0);
1212 if (!nlh)
1213 goto out_module_put;
1214
1215 if (msecs_since)
1216 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1217
1218 t = nlmsg_data(nlh);
1219 t->tca_family = AF_UNSPEC;
1220 t->tca__pad1 = 0;
1221 t->tca__pad2 = 0;
1222 cb->args[3] = jiffy_since;
1223 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1224 if (!count_attr)
1225 goto out_module_put;
1226
1227 nest = nla_nest_start(skb, TCA_ACT_TAB);
1228 if (nest == NULL)
1229 goto out_module_put;
1230
1231 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o);
1232 if (ret < 0)
1233 goto out_module_put;
1234
1235 if (ret > 0) {
1236 nla_nest_end(skb, nest);
1237 ret = skb->len;
1238 act_count = cb->args[1];
1239 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1240 cb->args[1] = 0;
1241 } else
1242 nlmsg_trim(skb, b);
1243
1244 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1245 if (NETLINK_CB(cb->skb).portid && ret)
1246 nlh->nlmsg_flags |= NLM_F_MULTI;
1247 module_put(a_o->owner);
1248 return skb->len;
1249
1250 out_module_put:
1251 module_put(a_o->owner);
1252 nlmsg_trim(skb, b);
1253 return skb->len;
1254 }
1255
1256 struct tcf_action_net {
1257 struct rhashtable egdev_ht;
1258 };
1259
1260 static unsigned int tcf_action_net_id;
1261
1262 struct tcf_action_egdev_cb {
1263 struct list_head list;
1264 tc_setup_cb_t *cb;
1265 void *cb_priv;
1266 };
1267
1268 struct tcf_action_egdev {
1269 struct rhash_head ht_node;
1270 const struct net_device *dev;
1271 unsigned int refcnt;
1272 struct list_head cb_list;
1273 };
1274
1275 static const struct rhashtable_params tcf_action_egdev_ht_params = {
1276 .key_offset = offsetof(struct tcf_action_egdev, dev),
1277 .head_offset = offsetof(struct tcf_action_egdev, ht_node),
1278 .key_len = sizeof(const struct net_device *),
1279 };
1280
1281 static struct tcf_action_egdev *
1282 tcf_action_egdev_lookup(const struct net_device *dev)
1283 {
1284 struct net *net = dev_net(dev);
1285 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1286
1287 return rhashtable_lookup_fast(&tan->egdev_ht, &dev,
1288 tcf_action_egdev_ht_params);
1289 }
1290
1291 static struct tcf_action_egdev *
1292 tcf_action_egdev_get(const struct net_device *dev)
1293 {
1294 struct tcf_action_egdev *egdev;
1295 struct tcf_action_net *tan;
1296
1297 egdev = tcf_action_egdev_lookup(dev);
1298 if (egdev)
1299 goto inc_ref;
1300
1301 egdev = kzalloc(sizeof(*egdev), GFP_KERNEL);
1302 if (!egdev)
1303 return NULL;
1304 INIT_LIST_HEAD(&egdev->cb_list);
1305 egdev->dev = dev;
1306 tan = net_generic(dev_net(dev), tcf_action_net_id);
1307 rhashtable_insert_fast(&tan->egdev_ht, &egdev->ht_node,
1308 tcf_action_egdev_ht_params);
1309
1310 inc_ref:
1311 egdev->refcnt++;
1312 return egdev;
1313 }
1314
1315 static void tcf_action_egdev_put(struct tcf_action_egdev *egdev)
1316 {
1317 struct tcf_action_net *tan;
1318
1319 if (--egdev->refcnt)
1320 return;
1321 tan = net_generic(dev_net(egdev->dev), tcf_action_net_id);
1322 rhashtable_remove_fast(&tan->egdev_ht, &egdev->ht_node,
1323 tcf_action_egdev_ht_params);
1324 kfree(egdev);
1325 }
1326
1327 static struct tcf_action_egdev_cb *
1328 tcf_action_egdev_cb_lookup(struct tcf_action_egdev *egdev,
1329 tc_setup_cb_t *cb, void *cb_priv)
1330 {
1331 struct tcf_action_egdev_cb *egdev_cb;
1332
1333 list_for_each_entry(egdev_cb, &egdev->cb_list, list)
1334 if (egdev_cb->cb == cb && egdev_cb->cb_priv == cb_priv)
1335 return egdev_cb;
1336 return NULL;
1337 }
1338
1339 static int tcf_action_egdev_cb_call(struct tcf_action_egdev *egdev,
1340 enum tc_setup_type type,
1341 void *type_data, bool err_stop)
1342 {
1343 struct tcf_action_egdev_cb *egdev_cb;
1344 int ok_count = 0;
1345 int err;
1346
1347 list_for_each_entry(egdev_cb, &egdev->cb_list, list) {
1348 err = egdev_cb->cb(type, type_data, egdev_cb->cb_priv);
1349 if (err) {
1350 if (err_stop)
1351 return err;
1352 } else {
1353 ok_count++;
1354 }
1355 }
1356 return ok_count;
1357 }
1358
1359 static int tcf_action_egdev_cb_add(struct tcf_action_egdev *egdev,
1360 tc_setup_cb_t *cb, void *cb_priv)
1361 {
1362 struct tcf_action_egdev_cb *egdev_cb;
1363
1364 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1365 if (WARN_ON(egdev_cb))
1366 return -EEXIST;
1367 egdev_cb = kzalloc(sizeof(*egdev_cb), GFP_KERNEL);
1368 if (!egdev_cb)
1369 return -ENOMEM;
1370 egdev_cb->cb = cb;
1371 egdev_cb->cb_priv = cb_priv;
1372 list_add(&egdev_cb->list, &egdev->cb_list);
1373 return 0;
1374 }
1375
1376 static void tcf_action_egdev_cb_del(struct tcf_action_egdev *egdev,
1377 tc_setup_cb_t *cb, void *cb_priv)
1378 {
1379 struct tcf_action_egdev_cb *egdev_cb;
1380
1381 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1382 if (WARN_ON(!egdev_cb))
1383 return;
1384 list_del(&egdev_cb->list);
1385 kfree(egdev_cb);
1386 }
1387
1388 static int __tc_setup_cb_egdev_register(const struct net_device *dev,
1389 tc_setup_cb_t *cb, void *cb_priv)
1390 {
1391 struct tcf_action_egdev *egdev = tcf_action_egdev_get(dev);
1392 int err;
1393
1394 if (!egdev)
1395 return -ENOMEM;
1396 err = tcf_action_egdev_cb_add(egdev, cb, cb_priv);
1397 if (err)
1398 goto err_cb_add;
1399 return 0;
1400
1401 err_cb_add:
1402 tcf_action_egdev_put(egdev);
1403 return err;
1404 }
1405 int tc_setup_cb_egdev_register(const struct net_device *dev,
1406 tc_setup_cb_t *cb, void *cb_priv)
1407 {
1408 int err;
1409
1410 rtnl_lock();
1411 err = __tc_setup_cb_egdev_register(dev, cb, cb_priv);
1412 rtnl_unlock();
1413 return err;
1414 }
1415 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_register);
1416
1417 static void __tc_setup_cb_egdev_unregister(const struct net_device *dev,
1418 tc_setup_cb_t *cb, void *cb_priv)
1419 {
1420 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1421
1422 if (WARN_ON(!egdev))
1423 return;
1424 tcf_action_egdev_cb_del(egdev, cb, cb_priv);
1425 tcf_action_egdev_put(egdev);
1426 }
1427 void tc_setup_cb_egdev_unregister(const struct net_device *dev,
1428 tc_setup_cb_t *cb, void *cb_priv)
1429 {
1430 rtnl_lock();
1431 __tc_setup_cb_egdev_unregister(dev, cb, cb_priv);
1432 rtnl_unlock();
1433 }
1434 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_unregister);
1435
1436 int tc_setup_cb_egdev_call(const struct net_device *dev,
1437 enum tc_setup_type type, void *type_data,
1438 bool err_stop)
1439 {
1440 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1441
1442 if (!egdev)
1443 return 0;
1444 return tcf_action_egdev_cb_call(egdev, type, type_data, err_stop);
1445 }
1446 EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_call);
1447
1448 static __net_init int tcf_action_net_init(struct net *net)
1449 {
1450 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1451
1452 return rhashtable_init(&tan->egdev_ht, &tcf_action_egdev_ht_params);
1453 }
1454
1455 static void __net_exit tcf_action_net_exit(struct net *net)
1456 {
1457 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1458
1459 rhashtable_destroy(&tan->egdev_ht);
1460 }
1461
1462 static struct pernet_operations tcf_action_net_ops = {
1463 .init = tcf_action_net_init,
1464 .exit = tcf_action_net_exit,
1465 .id = &tcf_action_net_id,
1466 .size = sizeof(struct tcf_action_net),
1467 };
1468
1469 static int __init tc_action_init(void)
1470 {
1471 int err;
1472
1473 err = register_pernet_subsys(&tcf_action_net_ops);
1474 if (err)
1475 return err;
1476
1477 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1478 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1479 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1480 0);
1481
1482 return 0;
1483 }
1484
1485 subsys_initcall(tc_action_init);
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