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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 <net/net_namespace.h>
25#include <net/sock.h>
26#include <net/sch_generic.h>
27#include <net/act_api.h>
28#include <net/netlink.h>
29
30void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
31{
32 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
33 struct tcf_common **p1p;
34
35 for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
36 if (*p1p == p) {
37 write_lock_bh(hinfo->lock);
38 *p1p = p->tcfc_next;
39 write_unlock_bh(hinfo->lock);
40 gen_kill_estimator(&p->tcfc_bstats,
41 &p->tcfc_rate_est);
42 /*
43 * gen_estimator est_timer() might access p->tcfc_lock
44 * or bstats, wait a RCU grace period before freeing p
45 */
46 kfree_rcu(p, tcfc_rcu);
47 return;
48 }
49 }
50 WARN_ON(1);
51}
52EXPORT_SYMBOL(tcf_hash_destroy);
53
54int tcf_hash_release(struct tcf_common *p, int bind,
55 struct tcf_hashinfo *hinfo)
56{
57 int ret = 0;
58
59 if (p) {
60 if (bind)
61 p->tcfc_bindcnt--;
62
63 p->tcfc_refcnt--;
64 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
65 tcf_hash_destroy(p, hinfo);
66 ret = 1;
67 }
68 }
69 return ret;
70}
71EXPORT_SYMBOL(tcf_hash_release);
72
73static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
74 struct tc_action *a, struct tcf_hashinfo *hinfo)
75{
76 struct tcf_common *p;
77 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
78 struct nlattr *nest;
79
80 read_lock_bh(hinfo->lock);
81
82 s_i = cb->args[0];
83
84 for (i = 0; i < (hinfo->hmask + 1); i++) {
85 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
86
87 for (; p; p = p->tcfc_next) {
88 index++;
89 if (index < s_i)
90 continue;
91 a->priv = p;
92 a->order = n_i;
93
94 nest = nla_nest_start(skb, a->order);
95 if (nest == NULL)
96 goto nla_put_failure;
97 err = tcf_action_dump_1(skb, a, 0, 0);
98 if (err < 0) {
99 index--;
100 nlmsg_trim(skb, nest);
101 goto done;
102 }
103 nla_nest_end(skb, nest);
104 n_i++;
105 if (n_i >= TCA_ACT_MAX_PRIO)
106 goto done;
107 }
108 }
109done:
110 read_unlock_bh(hinfo->lock);
111 if (n_i)
112 cb->args[0] += n_i;
113 return n_i;
114
115nla_put_failure:
116 nla_nest_cancel(skb, nest);
117 goto done;
118}
119
120static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
121 struct tcf_hashinfo *hinfo)
122{
123 struct tcf_common *p, *s_p;
124 struct nlattr *nest;
125 int i = 0, n_i = 0;
126
127 nest = nla_nest_start(skb, a->order);
128 if (nest == NULL)
129 goto nla_put_failure;
130 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
131 goto nla_put_failure;
132 for (i = 0; i < (hinfo->hmask + 1); i++) {
133 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
134
135 while (p != NULL) {
136 s_p = p->tcfc_next;
137 if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
138 module_put(a->ops->owner);
139 n_i++;
140 p = s_p;
141 }
142 }
143 if (nla_put_u32(skb, TCA_FCNT, n_i))
144 goto nla_put_failure;
145 nla_nest_end(skb, nest);
146
147 return n_i;
148nla_put_failure:
149 nla_nest_cancel(skb, nest);
150 return -EINVAL;
151}
152
153int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
154 int type, struct tc_action *a)
155{
156 struct tcf_hashinfo *hinfo = a->ops->hinfo;
157
158 if (type == RTM_DELACTION) {
159 return tcf_del_walker(skb, a, hinfo);
160 } else if (type == RTM_GETACTION) {
161 return tcf_dump_walker(skb, cb, a, hinfo);
162 } else {
163 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
164 return -EINVAL;
165 }
166}
167EXPORT_SYMBOL(tcf_generic_walker);
168
169struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
170{
171 struct tcf_common *p;
172
173 read_lock_bh(hinfo->lock);
174 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
175 p = p->tcfc_next) {
176 if (p->tcfc_index == index)
177 break;
178 }
179 read_unlock_bh(hinfo->lock);
180
181 return p;
182}
183EXPORT_SYMBOL(tcf_hash_lookup);
184
185u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
186{
187 u32 val = *idx_gen;
188
189 do {
190 if (++val == 0)
191 val = 1;
192 } while (tcf_hash_lookup(val, hinfo));
193
194 return (*idx_gen = val);
195}
196EXPORT_SYMBOL(tcf_hash_new_index);
197
198int tcf_hash_search(struct tc_action *a, u32 index)
199{
200 struct tcf_hashinfo *hinfo = a->ops->hinfo;
201 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
202
203 if (p) {
204 a->priv = p;
205 return 1;
206 }
207 return 0;
208}
209EXPORT_SYMBOL(tcf_hash_search);
210
211struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
212 struct tcf_hashinfo *hinfo)
213{
214 struct tcf_common *p = NULL;
215 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
216 if (bind)
217 p->tcfc_bindcnt++;
218 p->tcfc_refcnt++;
219 a->priv = p;
220 }
221 return p;
222}
223EXPORT_SYMBOL(tcf_hash_check);
224
225struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est,
226 struct tc_action *a, int size, int bind,
227 u32 *idx_gen, struct tcf_hashinfo *hinfo)
228{
229 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
230
231 if (unlikely(!p))
232 return ERR_PTR(-ENOMEM);
233 p->tcfc_refcnt = 1;
234 if (bind)
235 p->tcfc_bindcnt = 1;
236
237 spin_lock_init(&p->tcfc_lock);
238 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
239 p->tcfc_tm.install = jiffies;
240 p->tcfc_tm.lastuse = jiffies;
241 if (est) {
242 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
243 &p->tcfc_lock, est);
244 if (err) {
245 kfree(p);
246 return ERR_PTR(err);
247 }
248 }
249
250 a->priv = (void *) p;
251 return p;
252}
253EXPORT_SYMBOL(tcf_hash_create);
254
255void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
256{
257 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
258
259 write_lock_bh(hinfo->lock);
260 p->tcfc_next = hinfo->htab[h];
261 hinfo->htab[h] = p;
262 write_unlock_bh(hinfo->lock);
263}
264EXPORT_SYMBOL(tcf_hash_insert);
265
266static struct tc_action_ops *act_base = NULL;
267static DEFINE_RWLOCK(act_mod_lock);
268
269int tcf_register_action(struct tc_action_ops *act)
270{
271 struct tc_action_ops *a, **ap;
272
273 write_lock(&act_mod_lock);
274 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
275 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
276 write_unlock(&act_mod_lock);
277 return -EEXIST;
278 }
279 }
280 act->next = NULL;
281 *ap = act;
282 write_unlock(&act_mod_lock);
283 return 0;
284}
285EXPORT_SYMBOL(tcf_register_action);
286
287int tcf_unregister_action(struct tc_action_ops *act)
288{
289 struct tc_action_ops *a, **ap;
290 int err = -ENOENT;
291
292 write_lock(&act_mod_lock);
293 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
294 if (a == act)
295 break;
296 if (a) {
297 *ap = a->next;
298 a->next = NULL;
299 err = 0;
300 }
301 write_unlock(&act_mod_lock);
302 return err;
303}
304EXPORT_SYMBOL(tcf_unregister_action);
305
306/* lookup by name */
307static struct tc_action_ops *tc_lookup_action_n(char *kind)
308{
309 struct tc_action_ops *a = NULL;
310
311 if (kind) {
312 read_lock(&act_mod_lock);
313 for (a = act_base; a; a = a->next) {
314 if (strcmp(kind, a->kind) == 0) {
315 if (!try_module_get(a->owner)) {
316 read_unlock(&act_mod_lock);
317 return NULL;
318 }
319 break;
320 }
321 }
322 read_unlock(&act_mod_lock);
323 }
324 return a;
325}
326
327/* lookup by nlattr */
328static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
329{
330 struct tc_action_ops *a = NULL;
331
332 if (kind) {
333 read_lock(&act_mod_lock);
334 for (a = act_base; a; a = a->next) {
335 if (nla_strcmp(kind, a->kind) == 0) {
336 if (!try_module_get(a->owner)) {
337 read_unlock(&act_mod_lock);
338 return NULL;
339 }
340 break;
341 }
342 }
343 read_unlock(&act_mod_lock);
344 }
345 return a;
346}
347
348#if 0
349/* lookup by id */
350static struct tc_action_ops *tc_lookup_action_id(u32 type)
351{
352 struct tc_action_ops *a = NULL;
353
354 if (type) {
355 read_lock(&act_mod_lock);
356 for (a = act_base; a; a = a->next) {
357 if (a->type == type) {
358 if (!try_module_get(a->owner)) {
359 read_unlock(&act_mod_lock);
360 return NULL;
361 }
362 break;
363 }
364 }
365 read_unlock(&act_mod_lock);
366 }
367 return a;
368}
369#endif
370
371int tcf_action_exec(struct sk_buff *skb, const struct tc_action *act,
372 struct tcf_result *res)
373{
374 const struct tc_action *a;
375 int ret = -1;
376
377 if (skb->tc_verd & TC_NCLS) {
378 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
379 ret = TC_ACT_OK;
380 goto exec_done;
381 }
382 while ((a = act) != NULL) {
383repeat:
384 if (a->ops && a->ops->act) {
385 ret = a->ops->act(skb, a, res);
386 if (TC_MUNGED & skb->tc_verd) {
387 /* copied already, allow trampling */
388 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
389 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
390 }
391 if (ret == TC_ACT_REPEAT)
392 goto repeat; /* we need a ttl - JHS */
393 if (ret != TC_ACT_PIPE)
394 goto exec_done;
395 }
396 act = a->next;
397 }
398exec_done:
399 return ret;
400}
401EXPORT_SYMBOL(tcf_action_exec);
402
403void tcf_action_destroy(struct tc_action *act, int bind)
404{
405 struct tc_action *a;
406
407 for (a = act; a; a = act) {
408 if (a->ops && a->ops->cleanup) {
409 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
410 module_put(a->ops->owner);
411 act = act->next;
412 kfree(a);
413 } else {
414 /*FIXME: Remove later - catch insertion bugs*/
415 WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n");
416 act = act->next;
417 kfree(a);
418 }
419 }
420}
421
422int
423tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
424{
425 int err = -EINVAL;
426
427 if (a->ops == NULL || a->ops->dump == NULL)
428 return err;
429 return a->ops->dump(skb, a, bind, ref);
430}
431
432int
433tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
434{
435 int err = -EINVAL;
436 unsigned char *b = skb_tail_pointer(skb);
437 struct nlattr *nest;
438
439 if (a->ops == NULL || a->ops->dump == NULL)
440 return err;
441
442 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
443 goto nla_put_failure;
444 if (tcf_action_copy_stats(skb, a, 0))
445 goto nla_put_failure;
446 nest = nla_nest_start(skb, TCA_OPTIONS);
447 if (nest == NULL)
448 goto nla_put_failure;
449 err = tcf_action_dump_old(skb, a, bind, ref);
450 if (err > 0) {
451 nla_nest_end(skb, nest);
452 return err;
453 }
454
455nla_put_failure:
456 nlmsg_trim(skb, b);
457 return -1;
458}
459EXPORT_SYMBOL(tcf_action_dump_1);
460
461int
462tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
463{
464 struct tc_action *a;
465 int err = -EINVAL;
466 struct nlattr *nest;
467
468 while ((a = act) != NULL) {
469 act = a->next;
470 nest = nla_nest_start(skb, a->order);
471 if (nest == NULL)
472 goto nla_put_failure;
473 err = tcf_action_dump_1(skb, a, bind, ref);
474 if (err < 0)
475 goto errout;
476 nla_nest_end(skb, nest);
477 }
478
479 return 0;
480
481nla_put_failure:
482 err = -EINVAL;
483errout:
484 nla_nest_cancel(skb, nest);
485 return err;
486}
487
488struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
489 char *name, int ovr, int bind)
490{
491 struct tc_action *a;
492 struct tc_action_ops *a_o;
493 char act_name[IFNAMSIZ];
494 struct nlattr *tb[TCA_ACT_MAX + 1];
495 struct nlattr *kind;
496 int err;
497
498 if (name == NULL) {
499 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
500 if (err < 0)
501 goto err_out;
502 err = -EINVAL;
503 kind = tb[TCA_ACT_KIND];
504 if (kind == NULL)
505 goto err_out;
506 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
507 goto err_out;
508 } else {
509 err = -EINVAL;
510 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
511 goto err_out;
512 }
513
514 a_o = tc_lookup_action_n(act_name);
515 if (a_o == NULL) {
516#ifdef CONFIG_MODULES
517 rtnl_unlock();
518 request_module("act_%s", act_name);
519 rtnl_lock();
520
521 a_o = tc_lookup_action_n(act_name);
522
523 /* We dropped the RTNL semaphore in order to
524 * perform the module load. So, even if we
525 * succeeded in loading the module we have to
526 * tell the caller to replay the request. We
527 * indicate this using -EAGAIN.
528 */
529 if (a_o != NULL) {
530 err = -EAGAIN;
531 goto err_mod;
532 }
533#endif
534 err = -ENOENT;
535 goto err_out;
536 }
537
538 err = -ENOMEM;
539 a = kzalloc(sizeof(*a), GFP_KERNEL);
540 if (a == NULL)
541 goto err_mod;
542
543 /* backward compatibility for policer */
544 if (name == NULL)
545 err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
546 else
547 err = a_o->init(nla, est, a, ovr, bind);
548 if (err < 0)
549 goto err_free;
550
551 /* module count goes up only when brand new policy is created
552 * if it exists and is only bound to in a_o->init() then
553 * ACT_P_CREATED is not returned (a zero is).
554 */
555 if (err != ACT_P_CREATED)
556 module_put(a_o->owner);
557 a->ops = a_o;
558
559 return a;
560
561err_free:
562 kfree(a);
563err_mod:
564 module_put(a_o->owner);
565err_out:
566 return ERR_PTR(err);
567}
568
569struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
570 char *name, int ovr, int bind)
571{
572 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
573 struct tc_action *head = NULL, *act, *act_prev = NULL;
574 int err;
575 int i;
576
577 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
578 if (err < 0)
579 return ERR_PTR(err);
580
581 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
582 act = tcf_action_init_1(tb[i], est, name, ovr, bind);
583 if (IS_ERR(act))
584 goto err;
585 act->order = i;
586
587 if (head == NULL)
588 head = act;
589 else
590 act_prev->next = act;
591 act_prev = act;
592 }
593 return head;
594
595err:
596 if (head != NULL)
597 tcf_action_destroy(head, bind);
598 return act;
599}
600
601int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
602 int compat_mode)
603{
604 int err = 0;
605 struct gnet_dump d;
606 struct tcf_act_hdr *h = a->priv;
607
608 if (h == NULL)
609 goto errout;
610
611 /* compat_mode being true specifies a call that is supposed
612 * to add additional backward compatibility statistic TLVs.
613 */
614 if (compat_mode) {
615 if (a->type == TCA_OLD_COMPAT)
616 err = gnet_stats_start_copy_compat(skb, 0,
617 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
618 else
619 return 0;
620 } else
621 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
622 &h->tcf_lock, &d);
623
624 if (err < 0)
625 goto errout;
626
627 if (a->ops != NULL && a->ops->get_stats != NULL)
628 if (a->ops->get_stats(skb, a) < 0)
629 goto errout;
630
631 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
632 gnet_stats_copy_rate_est(&d, &h->tcf_bstats,
633 &h->tcf_rate_est) < 0 ||
634 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
635 goto errout;
636
637 if (gnet_stats_finish_copy(&d) < 0)
638 goto errout;
639
640 return 0;
641
642errout:
643 return -1;
644}
645
646static int
647tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
648 u16 flags, int event, int bind, int ref)
649{
650 struct tcamsg *t;
651 struct nlmsghdr *nlh;
652 unsigned char *b = skb_tail_pointer(skb);
653 struct nlattr *nest;
654
655 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
656
657 t = NLMSG_DATA(nlh);
658 t->tca_family = AF_UNSPEC;
659 t->tca__pad1 = 0;
660 t->tca__pad2 = 0;
661
662 nest = nla_nest_start(skb, TCA_ACT_TAB);
663 if (nest == NULL)
664 goto nla_put_failure;
665
666 if (tcf_action_dump(skb, a, bind, ref) < 0)
667 goto nla_put_failure;
668
669 nla_nest_end(skb, nest);
670
671 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
672 return skb->len;
673
674nla_put_failure:
675nlmsg_failure:
676 nlmsg_trim(skb, b);
677 return -1;
678}
679
680static int
681act_get_notify(struct net *net, u32 pid, struct nlmsghdr *n,
682 struct tc_action *a, int event)
683{
684 struct sk_buff *skb;
685
686 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
687 if (!skb)
688 return -ENOBUFS;
689 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
690 kfree_skb(skb);
691 return -EINVAL;
692 }
693
694 return rtnl_unicast(skb, net, pid);
695}
696
697static struct tc_action *
698tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
699{
700 struct nlattr *tb[TCA_ACT_MAX + 1];
701 struct tc_action *a;
702 int index;
703 int err;
704
705 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
706 if (err < 0)
707 goto err_out;
708
709 err = -EINVAL;
710 if (tb[TCA_ACT_INDEX] == NULL ||
711 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
712 goto err_out;
713 index = nla_get_u32(tb[TCA_ACT_INDEX]);
714
715 err = -ENOMEM;
716 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
717 if (a == NULL)
718 goto err_out;
719
720 err = -EINVAL;
721 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
722 if (a->ops == NULL)
723 goto err_free;
724 if (a->ops->lookup == NULL)
725 goto err_mod;
726 err = -ENOENT;
727 if (a->ops->lookup(a, index) == 0)
728 goto err_mod;
729
730 module_put(a->ops->owner);
731 return a;
732
733err_mod:
734 module_put(a->ops->owner);
735err_free:
736 kfree(a);
737err_out:
738 return ERR_PTR(err);
739}
740
741static void cleanup_a(struct tc_action *act)
742{
743 struct tc_action *a;
744
745 for (a = act; a; a = act) {
746 act = a->next;
747 kfree(a);
748 }
749}
750
751static struct tc_action *create_a(int i)
752{
753 struct tc_action *act;
754
755 act = kzalloc(sizeof(*act), GFP_KERNEL);
756 if (act == NULL) {
757 pr_debug("create_a: failed to alloc!\n");
758 return NULL;
759 }
760 act->order = i;
761 return act;
762}
763
764static int tca_action_flush(struct net *net, struct nlattr *nla,
765 struct nlmsghdr *n, u32 pid)
766{
767 struct sk_buff *skb;
768 unsigned char *b;
769 struct nlmsghdr *nlh;
770 struct tcamsg *t;
771 struct netlink_callback dcb;
772 struct nlattr *nest;
773 struct nlattr *tb[TCA_ACT_MAX + 1];
774 struct nlattr *kind;
775 struct tc_action *a = create_a(0);
776 int err = -ENOMEM;
777
778 if (a == NULL) {
779 pr_debug("tca_action_flush: couldnt create tc_action\n");
780 return err;
781 }
782
783 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
784 if (!skb) {
785 pr_debug("tca_action_flush: failed skb alloc\n");
786 kfree(a);
787 return err;
788 }
789
790 b = skb_tail_pointer(skb);
791
792 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
793 if (err < 0)
794 goto err_out;
795
796 err = -EINVAL;
797 kind = tb[TCA_ACT_KIND];
798 a->ops = tc_lookup_action(kind);
799 if (a->ops == NULL)
800 goto err_out;
801
802 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
803 t = NLMSG_DATA(nlh);
804 t->tca_family = AF_UNSPEC;
805 t->tca__pad1 = 0;
806 t->tca__pad2 = 0;
807
808 nest = nla_nest_start(skb, TCA_ACT_TAB);
809 if (nest == NULL)
810 goto nla_put_failure;
811
812 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
813 if (err < 0)
814 goto nla_put_failure;
815 if (err == 0)
816 goto noflush_out;
817
818 nla_nest_end(skb, nest);
819
820 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
821 nlh->nlmsg_flags |= NLM_F_ROOT;
822 module_put(a->ops->owner);
823 kfree(a);
824 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC,
825 n->nlmsg_flags & NLM_F_ECHO);
826 if (err > 0)
827 return 0;
828
829 return err;
830
831nla_put_failure:
832nlmsg_failure:
833 module_put(a->ops->owner);
834err_out:
835noflush_out:
836 kfree_skb(skb);
837 kfree(a);
838 return err;
839}
840
841static int
842tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
843 u32 pid, int event)
844{
845 int i, ret;
846 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
847 struct tc_action *head = NULL, *act, *act_prev = NULL;
848
849 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
850 if (ret < 0)
851 return ret;
852
853 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
854 if (tb[1] != NULL)
855 return tca_action_flush(net, tb[1], n, pid);
856 else
857 return -EINVAL;
858 }
859
860 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
861 act = tcf_action_get_1(tb[i], n, pid);
862 if (IS_ERR(act)) {
863 ret = PTR_ERR(act);
864 goto err;
865 }
866 act->order = i;
867
868 if (head == NULL)
869 head = act;
870 else
871 act_prev->next = act;
872 act_prev = act;
873 }
874
875 if (event == RTM_GETACTION)
876 ret = act_get_notify(net, pid, n, head, event);
877 else { /* delete */
878 struct sk_buff *skb;
879
880 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
881 if (!skb) {
882 ret = -ENOBUFS;
883 goto err;
884 }
885
886 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
887 0, 1) <= 0) {
888 kfree_skb(skb);
889 ret = -EINVAL;
890 goto err;
891 }
892
893 /* now do the delete */
894 tcf_action_destroy(head, 0);
895 ret = rtnetlink_send(skb, net, pid, RTNLGRP_TC,
896 n->nlmsg_flags & NLM_F_ECHO);
897 if (ret > 0)
898 return 0;
899 return ret;
900 }
901err:
902 cleanup_a(head);
903 return ret;
904}
905
906static int tcf_add_notify(struct net *net, struct tc_action *a,
907 u32 pid, u32 seq, int event, u16 flags)
908{
909 struct tcamsg *t;
910 struct nlmsghdr *nlh;
911 struct sk_buff *skb;
912 struct nlattr *nest;
913 unsigned char *b;
914 int err = 0;
915
916 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
917 if (!skb)
918 return -ENOBUFS;
919
920 b = skb_tail_pointer(skb);
921
922 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
923 t = NLMSG_DATA(nlh);
924 t->tca_family = AF_UNSPEC;
925 t->tca__pad1 = 0;
926 t->tca__pad2 = 0;
927
928 nest = nla_nest_start(skb, TCA_ACT_TAB);
929 if (nest == NULL)
930 goto nla_put_failure;
931
932 if (tcf_action_dump(skb, a, 0, 0) < 0)
933 goto nla_put_failure;
934
935 nla_nest_end(skb, nest);
936
937 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
938 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
939
940 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags & NLM_F_ECHO);
941 if (err > 0)
942 err = 0;
943 return err;
944
945nla_put_failure:
946nlmsg_failure:
947 kfree_skb(skb);
948 return -1;
949}
950
951
952static int
953tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
954 u32 pid, int ovr)
955{
956 int ret = 0;
957 struct tc_action *act;
958 struct tc_action *a;
959 u32 seq = n->nlmsg_seq;
960
961 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
962 if (act == NULL)
963 goto done;
964 if (IS_ERR(act)) {
965 ret = PTR_ERR(act);
966 goto done;
967 }
968
969 /* dump then free all the actions after update; inserted policy
970 * stays intact
971 */
972 ret = tcf_add_notify(net, act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
973 for (a = act; a; a = act) {
974 act = a->next;
975 kfree(a);
976 }
977done:
978 return ret;
979}
980
981static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
982{
983 struct net *net = sock_net(skb->sk);
984 struct nlattr *tca[TCA_ACT_MAX + 1];
985 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
986 int ret = 0, ovr = 0;
987
988 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
989 if (ret < 0)
990 return ret;
991
992 if (tca[TCA_ACT_TAB] == NULL) {
993 pr_notice("tc_ctl_action: received NO action attribs\n");
994 return -EINVAL;
995 }
996
997 /* n->nlmsg_flags & NLM_F_CREATE */
998 switch (n->nlmsg_type) {
999 case RTM_NEWACTION:
1000 /* we are going to assume all other flags
1001 * imply create only if it doesn't exist
1002 * Note that CREATE | EXCL implies that
1003 * but since we want avoid ambiguity (eg when flags
1004 * is zero) then just set this
1005 */
1006 if (n->nlmsg_flags & NLM_F_REPLACE)
1007 ovr = 1;
1008replay:
1009 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, pid, ovr);
1010 if (ret == -EAGAIN)
1011 goto replay;
1012 break;
1013 case RTM_DELACTION:
1014 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1015 pid, RTM_DELACTION);
1016 break;
1017 case RTM_GETACTION:
1018 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1019 pid, RTM_GETACTION);
1020 break;
1021 default:
1022 BUG();
1023 }
1024
1025 return ret;
1026}
1027
1028static struct nlattr *
1029find_dump_kind(const struct nlmsghdr *n)
1030{
1031 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1032 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1033 struct nlattr *nla[TCAA_MAX + 1];
1034 struct nlattr *kind;
1035
1036 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1037 return NULL;
1038 tb1 = nla[TCA_ACT_TAB];
1039 if (tb1 == NULL)
1040 return NULL;
1041
1042 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1043 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1044 return NULL;
1045
1046 if (tb[1] == NULL)
1047 return NULL;
1048 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1049 nla_len(tb[1]), NULL) < 0)
1050 return NULL;
1051 kind = tb2[TCA_ACT_KIND];
1052
1053 return kind;
1054}
1055
1056static int
1057tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1058{
1059 struct nlmsghdr *nlh;
1060 unsigned char *b = skb_tail_pointer(skb);
1061 struct nlattr *nest;
1062 struct tc_action_ops *a_o;
1063 struct tc_action a;
1064 int ret = 0;
1065 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
1066 struct nlattr *kind = find_dump_kind(cb->nlh);
1067
1068 if (kind == NULL) {
1069 pr_info("tc_dump_action: action bad kind\n");
1070 return 0;
1071 }
1072
1073 a_o = tc_lookup_action(kind);
1074 if (a_o == NULL)
1075 return 0;
1076
1077 memset(&a, 0, sizeof(struct tc_action));
1078 a.ops = a_o;
1079
1080 if (a_o->walk == NULL) {
1081 WARN(1, "tc_dump_action: %s !capable of dumping table\n",
1082 a_o->kind);
1083 goto nla_put_failure;
1084 }
1085
1086 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
1087 cb->nlh->nlmsg_type, sizeof(*t));
1088 t = NLMSG_DATA(nlh);
1089 t->tca_family = AF_UNSPEC;
1090 t->tca__pad1 = 0;
1091 t->tca__pad2 = 0;
1092
1093 nest = nla_nest_start(skb, TCA_ACT_TAB);
1094 if (nest == NULL)
1095 goto nla_put_failure;
1096
1097 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1098 if (ret < 0)
1099 goto nla_put_failure;
1100
1101 if (ret > 0) {
1102 nla_nest_end(skb, nest);
1103 ret = skb->len;
1104 } else
1105 nla_nest_cancel(skb, nest);
1106
1107 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1108 if (NETLINK_CB(cb->skb).pid && ret)
1109 nlh->nlmsg_flags |= NLM_F_MULTI;
1110 module_put(a_o->owner);
1111 return skb->len;
1112
1113nla_put_failure:
1114nlmsg_failure:
1115 module_put(a_o->owner);
1116 nlmsg_trim(skb, b);
1117 return skb->len;
1118}
1119
1120static int __init tc_action_init(void)
1121{
1122 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1123 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1124 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1125 NULL);
1126
1127 return 0;
1128}
1129
1130subsys_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);