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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/*
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
33static 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
45static void tcf_action_goto_chain_fini(struct tc_action *a)
46{
47 tcf_chain_put(a->goto_chain);
48}
49
50static 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 */
63static 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
78static void tcf_idr_remove(struct tcf_idrinfo *idrinfo, struct tc_action *p)
79{
80 spin_lock_bh(&idrinfo->lock);
81 idr_remove(&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
87int __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);
103 tcf_idr_remove(p->idrinfo, p);
104 ret = ACT_P_DELETED;
105 }
106 }
107
108 return ret;
109}
110EXPORT_SYMBOL(__tcf_idr_release);
111
112static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
113{
114 u32 cookie_len = 0;
115
116 if (act->act_cookie)
117 cookie_len = nla_total_size(act->act_cookie->len);
118
119 return nla_total_size(0) /* action number nested */
120 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
121 + cookie_len /* TCA_ACT_COOKIE */
122 + nla_total_size(0) /* TCA_ACT_STATS nested */
123 /* TCA_STATS_BASIC */
124 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
125 /* TCA_STATS_QUEUE */
126 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
127 + nla_total_size(0) /* TCA_OPTIONS nested */
128 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
129}
130
131static size_t tcf_action_full_attrs_size(size_t sz)
132{
133 return NLMSG_HDRLEN /* struct nlmsghdr */
134 + sizeof(struct tcamsg)
135 + nla_total_size(0) /* TCA_ACT_TAB nested */
136 + sz;
137}
138
139static size_t tcf_action_fill_size(const struct tc_action *act)
140{
141 size_t sz = tcf_action_shared_attrs_size(act);
142
143 if (act->ops->get_fill_size)
144 return act->ops->get_fill_size(act) + sz;
145 return sz;
146}
147
148static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
149 struct netlink_callback *cb)
150{
151 int err = 0, index = -1, s_i = 0, n_i = 0;
152 u32 act_flags = cb->args[2];
153 unsigned long jiffy_since = cb->args[3];
154 struct nlattr *nest;
155 struct idr *idr = &idrinfo->action_idr;
156 struct tc_action *p;
157 unsigned long id = 1;
158
159 spin_lock_bh(&idrinfo->lock);
160
161 s_i = cb->args[0];
162
163 idr_for_each_entry_ul(idr, p, id) {
164 index++;
165 if (index < s_i)
166 continue;
167
168 if (jiffy_since &&
169 time_after(jiffy_since,
170 (unsigned long)p->tcfa_tm.lastuse))
171 continue;
172
173 nest = nla_nest_start(skb, n_i);
174 if (!nest) {
175 index--;
176 goto nla_put_failure;
177 }
178 err = tcf_action_dump_1(skb, p, 0, 0);
179 if (err < 0) {
180 index--;
181 nlmsg_trim(skb, nest);
182 goto done;
183 }
184 nla_nest_end(skb, nest);
185 n_i++;
186 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
187 n_i >= TCA_ACT_MAX_PRIO)
188 goto done;
189 }
190done:
191 if (index >= 0)
192 cb->args[0] = index + 1;
193
194 spin_unlock_bh(&idrinfo->lock);
195 if (n_i) {
196 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
197 cb->args[1] = n_i;
198 }
199 return n_i;
200
201nla_put_failure:
202 nla_nest_cancel(skb, nest);
203 goto done;
204}
205
206static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
207 const struct tc_action_ops *ops)
208{
209 struct nlattr *nest;
210 int n_i = 0;
211 int ret = -EINVAL;
212 struct idr *idr = &idrinfo->action_idr;
213 struct tc_action *p;
214 unsigned long id = 1;
215
216 nest = nla_nest_start(skb, 0);
217 if (nest == NULL)
218 goto nla_put_failure;
219 if (nla_put_string(skb, TCA_KIND, ops->kind))
220 goto nla_put_failure;
221
222 idr_for_each_entry_ul(idr, p, id) {
223 ret = __tcf_idr_release(p, false, true);
224 if (ret == ACT_P_DELETED) {
225 module_put(ops->owner);
226 n_i++;
227 } else if (ret < 0) {
228 goto nla_put_failure;
229 }
230 }
231 if (nla_put_u32(skb, TCA_FCNT, n_i))
232 goto nla_put_failure;
233 nla_nest_end(skb, nest);
234
235 return n_i;
236nla_put_failure:
237 nla_nest_cancel(skb, nest);
238 return ret;
239}
240
241int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
242 struct netlink_callback *cb, int type,
243 const struct tc_action_ops *ops,
244 struct netlink_ext_ack *extack)
245{
246 struct tcf_idrinfo *idrinfo = tn->idrinfo;
247
248 if (type == RTM_DELACTION) {
249 return tcf_del_walker(idrinfo, skb, ops);
250 } else if (type == RTM_GETACTION) {
251 return tcf_dump_walker(idrinfo, skb, cb);
252 } else {
253 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
254 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
255 return -EINVAL;
256 }
257}
258EXPORT_SYMBOL(tcf_generic_walker);
259
260static struct tc_action *tcf_idr_lookup(u32 index, struct tcf_idrinfo *idrinfo)
261{
262 struct tc_action *p = NULL;
263
264 spin_lock_bh(&idrinfo->lock);
265 p = idr_find(&idrinfo->action_idr, index);
266 spin_unlock_bh(&idrinfo->lock);
267
268 return p;
269}
270
271int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
272{
273 struct tcf_idrinfo *idrinfo = tn->idrinfo;
274 struct tc_action *p = tcf_idr_lookup(index, idrinfo);
275
276 if (p) {
277 *a = p;
278 return 1;
279 }
280 return 0;
281}
282EXPORT_SYMBOL(tcf_idr_search);
283
284bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
285 int bind)
286{
287 struct tcf_idrinfo *idrinfo = tn->idrinfo;
288 struct tc_action *p = tcf_idr_lookup(index, idrinfo);
289
290 if (index && p) {
291 if (bind)
292 p->tcfa_bindcnt++;
293 p->tcfa_refcnt++;
294 *a = p;
295 return true;
296 }
297 return false;
298}
299EXPORT_SYMBOL(tcf_idr_check);
300
301int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
302 struct tc_action **a, const struct tc_action_ops *ops,
303 int bind, bool cpustats)
304{
305 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
306 struct tcf_idrinfo *idrinfo = tn->idrinfo;
307 struct idr *idr = &idrinfo->action_idr;
308 int err = -ENOMEM;
309
310 if (unlikely(!p))
311 return -ENOMEM;
312 p->tcfa_refcnt = 1;
313 if (bind)
314 p->tcfa_bindcnt = 1;
315
316 if (cpustats) {
317 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
318 if (!p->cpu_bstats)
319 goto err1;
320 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
321 if (!p->cpu_qstats)
322 goto err2;
323 }
324 spin_lock_init(&p->tcfa_lock);
325 idr_preload(GFP_KERNEL);
326 spin_lock_bh(&idrinfo->lock);
327 /* user doesn't specify an index */
328 if (!index) {
329 index = 1;
330 err = idr_alloc_u32(idr, NULL, &index, UINT_MAX, GFP_ATOMIC);
331 } else {
332 err = idr_alloc_u32(idr, NULL, &index, index, GFP_ATOMIC);
333 }
334 spin_unlock_bh(&idrinfo->lock);
335 idr_preload_end();
336 if (err)
337 goto err3;
338
339 p->tcfa_index = index;
340 p->tcfa_tm.install = jiffies;
341 p->tcfa_tm.lastuse = jiffies;
342 p->tcfa_tm.firstuse = 0;
343 if (est) {
344 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
345 &p->tcfa_rate_est,
346 &p->tcfa_lock, NULL, est);
347 if (err)
348 goto err4;
349 }
350
351 p->idrinfo = idrinfo;
352 p->ops = ops;
353 INIT_LIST_HEAD(&p->list);
354 *a = p;
355 return 0;
356err4:
357 idr_remove(idr, index);
358err3:
359 free_percpu(p->cpu_qstats);
360err2:
361 free_percpu(p->cpu_bstats);
362err1:
363 kfree(p);
364 return err;
365}
366EXPORT_SYMBOL(tcf_idr_create);
367
368void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
369{
370 struct tcf_idrinfo *idrinfo = tn->idrinfo;
371
372 spin_lock_bh(&idrinfo->lock);
373 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
374 spin_unlock_bh(&idrinfo->lock);
375}
376EXPORT_SYMBOL(tcf_idr_insert);
377
378void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
379 struct tcf_idrinfo *idrinfo)
380{
381 struct idr *idr = &idrinfo->action_idr;
382 struct tc_action *p;
383 int ret;
384 unsigned long id = 1;
385
386 idr_for_each_entry_ul(idr, p, id) {
387 ret = __tcf_idr_release(p, false, true);
388 if (ret == ACT_P_DELETED)
389 module_put(ops->owner);
390 else if (ret < 0)
391 return;
392 }
393 idr_destroy(&idrinfo->action_idr);
394}
395EXPORT_SYMBOL(tcf_idrinfo_destroy);
396
397static LIST_HEAD(act_base);
398static DEFINE_RWLOCK(act_mod_lock);
399
400int tcf_register_action(struct tc_action_ops *act,
401 struct pernet_operations *ops)
402{
403 struct tc_action_ops *a;
404 int ret;
405
406 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
407 return -EINVAL;
408
409 /* We have to register pernet ops before making the action ops visible,
410 * otherwise tcf_action_init_1() could get a partially initialized
411 * netns.
412 */
413 ret = register_pernet_subsys(ops);
414 if (ret)
415 return ret;
416
417 write_lock(&act_mod_lock);
418 list_for_each_entry(a, &act_base, head) {
419 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
420 write_unlock(&act_mod_lock);
421 unregister_pernet_subsys(ops);
422 return -EEXIST;
423 }
424 }
425 list_add_tail(&act->head, &act_base);
426 write_unlock(&act_mod_lock);
427
428 return 0;
429}
430EXPORT_SYMBOL(tcf_register_action);
431
432int tcf_unregister_action(struct tc_action_ops *act,
433 struct pernet_operations *ops)
434{
435 struct tc_action_ops *a;
436 int err = -ENOENT;
437
438 write_lock(&act_mod_lock);
439 list_for_each_entry(a, &act_base, head) {
440 if (a == act) {
441 list_del(&act->head);
442 err = 0;
443 break;
444 }
445 }
446 write_unlock(&act_mod_lock);
447 if (!err)
448 unregister_pernet_subsys(ops);
449 return err;
450}
451EXPORT_SYMBOL(tcf_unregister_action);
452
453/* lookup by name */
454static struct tc_action_ops *tc_lookup_action_n(char *kind)
455{
456 struct tc_action_ops *a, *res = NULL;
457
458 if (kind) {
459 read_lock(&act_mod_lock);
460 list_for_each_entry(a, &act_base, head) {
461 if (strcmp(kind, a->kind) == 0) {
462 if (try_module_get(a->owner))
463 res = a;
464 break;
465 }
466 }
467 read_unlock(&act_mod_lock);
468 }
469 return res;
470}
471
472/* lookup by nlattr */
473static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
474{
475 struct tc_action_ops *a, *res = NULL;
476
477 if (kind) {
478 read_lock(&act_mod_lock);
479 list_for_each_entry(a, &act_base, head) {
480 if (nla_strcmp(kind, a->kind) == 0) {
481 if (try_module_get(a->owner))
482 res = a;
483 break;
484 }
485 }
486 read_unlock(&act_mod_lock);
487 }
488 return res;
489}
490
491/*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
492#define TCA_ACT_MAX_PRIO_MASK 0x1FF
493int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
494 int nr_actions, struct tcf_result *res)
495{
496 u32 jmp_prgcnt = 0;
497 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
498 int i;
499 int ret = TC_ACT_OK;
500
501 if (skb_skip_tc_classify(skb))
502 return TC_ACT_OK;
503
504restart_act_graph:
505 for (i = 0; i < nr_actions; i++) {
506 const struct tc_action *a = actions[i];
507
508 if (jmp_prgcnt > 0) {
509 jmp_prgcnt -= 1;
510 continue;
511 }
512repeat:
513 ret = a->ops->act(skb, a, res);
514 if (ret == TC_ACT_REPEAT)
515 goto repeat; /* we need a ttl - JHS */
516
517 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
518 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
519 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
520 /* faulty opcode, stop pipeline */
521 return TC_ACT_OK;
522 } else {
523 jmp_ttl -= 1;
524 if (jmp_ttl > 0)
525 goto restart_act_graph;
526 else /* faulty graph, stop pipeline */
527 return TC_ACT_OK;
528 }
529 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
530 tcf_action_goto_chain_exec(a, res);
531 }
532
533 if (ret != TC_ACT_PIPE)
534 break;
535 }
536
537 return ret;
538}
539EXPORT_SYMBOL(tcf_action_exec);
540
541int tcf_action_destroy(struct list_head *actions, int bind)
542{
543 const struct tc_action_ops *ops;
544 struct tc_action *a, *tmp;
545 int ret = 0;
546
547 list_for_each_entry_safe(a, tmp, actions, list) {
548 ops = a->ops;
549 ret = __tcf_idr_release(a, bind, true);
550 if (ret == ACT_P_DELETED)
551 module_put(ops->owner);
552 else if (ret < 0)
553 return ret;
554 }
555 return ret;
556}
557
558int
559tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
560{
561 return a->ops->dump(skb, a, bind, ref);
562}
563
564int
565tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
566{
567 int err = -EINVAL;
568 unsigned char *b = skb_tail_pointer(skb);
569 struct nlattr *nest;
570
571 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
572 goto nla_put_failure;
573 if (tcf_action_copy_stats(skb, a, 0))
574 goto nla_put_failure;
575 if (a->act_cookie) {
576 if (nla_put(skb, TCA_ACT_COOKIE, a->act_cookie->len,
577 a->act_cookie->data))
578 goto nla_put_failure;
579 }
580
581 nest = nla_nest_start(skb, TCA_OPTIONS);
582 if (nest == NULL)
583 goto nla_put_failure;
584 err = tcf_action_dump_old(skb, a, bind, ref);
585 if (err > 0) {
586 nla_nest_end(skb, nest);
587 return err;
588 }
589
590nla_put_failure:
591 nlmsg_trim(skb, b);
592 return -1;
593}
594EXPORT_SYMBOL(tcf_action_dump_1);
595
596int tcf_action_dump(struct sk_buff *skb, struct list_head *actions,
597 int bind, int ref)
598{
599 struct tc_action *a;
600 int err = -EINVAL;
601 struct nlattr *nest;
602
603 list_for_each_entry(a, actions, list) {
604 nest = nla_nest_start(skb, a->order);
605 if (nest == NULL)
606 goto nla_put_failure;
607 err = tcf_action_dump_1(skb, a, bind, ref);
608 if (err < 0)
609 goto errout;
610 nla_nest_end(skb, nest);
611 }
612
613 return 0;
614
615nla_put_failure:
616 err = -EINVAL;
617errout:
618 nla_nest_cancel(skb, nest);
619 return err;
620}
621
622static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
623{
624 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
625 if (!c)
626 return NULL;
627
628 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
629 if (!c->data) {
630 kfree(c);
631 return NULL;
632 }
633 c->len = nla_len(tb[TCA_ACT_COOKIE]);
634
635 return c;
636}
637
638struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
639 struct nlattr *nla, struct nlattr *est,
640 char *name, int ovr, int bind,
641 struct netlink_ext_ack *extack)
642{
643 struct tc_action *a;
644 struct tc_action_ops *a_o;
645 struct tc_cookie *cookie = NULL;
646 char act_name[IFNAMSIZ];
647 struct nlattr *tb[TCA_ACT_MAX + 1];
648 struct nlattr *kind;
649 int err;
650
651 if (name == NULL) {
652 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
653 if (err < 0)
654 goto err_out;
655 err = -EINVAL;
656 kind = tb[TCA_ACT_KIND];
657 if (!kind) {
658 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
659 goto err_out;
660 }
661 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
662 NL_SET_ERR_MSG(extack, "TC action name too long");
663 goto err_out;
664 }
665 if (tb[TCA_ACT_COOKIE]) {
666 int cklen = nla_len(tb[TCA_ACT_COOKIE]);
667
668 if (cklen > TC_COOKIE_MAX_SIZE) {
669 NL_SET_ERR_MSG(extack, "TC cookie size above the maximum");
670 goto err_out;
671 }
672
673 cookie = nla_memdup_cookie(tb);
674 if (!cookie) {
675 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
676 err = -ENOMEM;
677 goto err_out;
678 }
679 }
680 } else {
681 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
682 NL_SET_ERR_MSG(extack, "TC action name too long");
683 err = -EINVAL;
684 goto err_out;
685 }
686 }
687
688 a_o = tc_lookup_action_n(act_name);
689 if (a_o == NULL) {
690#ifdef CONFIG_MODULES
691 rtnl_unlock();
692 request_module("act_%s", act_name);
693 rtnl_lock();
694
695 a_o = tc_lookup_action_n(act_name);
696
697 /* We dropped the RTNL semaphore in order to
698 * perform the module load. So, even if we
699 * succeeded in loading the module we have to
700 * tell the caller to replay the request. We
701 * indicate this using -EAGAIN.
702 */
703 if (a_o != NULL) {
704 err = -EAGAIN;
705 goto err_mod;
706 }
707#endif
708 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
709 err = -ENOENT;
710 goto err_out;
711 }
712
713 /* backward compatibility for policer */
714 if (name == NULL)
715 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
716 extack);
717 else
718 err = a_o->init(net, nla, est, &a, ovr, bind, extack);
719 if (err < 0)
720 goto err_mod;
721
722 if (name == NULL && tb[TCA_ACT_COOKIE]) {
723 if (a->act_cookie) {
724 kfree(a->act_cookie->data);
725 kfree(a->act_cookie);
726 }
727 a->act_cookie = cookie;
728 }
729
730 /* module count goes up only when brand new policy is created
731 * if it exists and is only bound to in a_o->init() then
732 * ACT_P_CREATED is not returned (a zero is).
733 */
734 if (err != ACT_P_CREATED)
735 module_put(a_o->owner);
736
737 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) {
738 err = tcf_action_goto_chain_init(a, tp);
739 if (err) {
740 LIST_HEAD(actions);
741
742 list_add_tail(&a->list, &actions);
743 tcf_action_destroy(&actions, bind);
744 NL_SET_ERR_MSG(extack, "Failed to init TC action chain");
745 return ERR_PTR(err);
746 }
747 }
748
749 return a;
750
751err_mod:
752 module_put(a_o->owner);
753err_out:
754 if (cookie) {
755 kfree(cookie->data);
756 kfree(cookie);
757 }
758 return ERR_PTR(err);
759}
760
761static void cleanup_a(struct list_head *actions, int ovr)
762{
763 struct tc_action *a;
764
765 if (!ovr)
766 return;
767
768 list_for_each_entry(a, actions, list)
769 a->tcfa_refcnt--;
770}
771
772int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
773 struct nlattr *est, char *name, int ovr, int bind,
774 struct list_head *actions, size_t *attr_size,
775 struct netlink_ext_ack *extack)
776{
777 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
778 struct tc_action *act;
779 size_t sz = 0;
780 int err;
781 int i;
782
783 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack);
784 if (err < 0)
785 return err;
786
787 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
788 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
789 extack);
790 if (IS_ERR(act)) {
791 err = PTR_ERR(act);
792 goto err;
793 }
794 act->order = i;
795 sz += tcf_action_fill_size(act);
796 if (ovr)
797 act->tcfa_refcnt++;
798 list_add_tail(&act->list, actions);
799 }
800
801 *attr_size = tcf_action_full_attrs_size(sz);
802
803 /* Remove the temp refcnt which was necessary to protect against
804 * destroying an existing action which was being replaced
805 */
806 cleanup_a(actions, ovr);
807 return 0;
808
809err:
810 tcf_action_destroy(actions, bind);
811 return err;
812}
813
814int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
815 int compat_mode)
816{
817 int err = 0;
818 struct gnet_dump d;
819
820 if (p == NULL)
821 goto errout;
822
823 /* compat_mode being true specifies a call that is supposed
824 * to add additional backward compatibility statistic TLVs.
825 */
826 if (compat_mode) {
827 if (p->type == TCA_OLD_COMPAT)
828 err = gnet_stats_start_copy_compat(skb, 0,
829 TCA_STATS,
830 TCA_XSTATS,
831 &p->tcfa_lock, &d,
832 TCA_PAD);
833 else
834 return 0;
835 } else
836 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
837 &p->tcfa_lock, &d, TCA_ACT_PAD);
838
839 if (err < 0)
840 goto errout;
841
842 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
843 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
844 gnet_stats_copy_queue(&d, p->cpu_qstats,
845 &p->tcfa_qstats,
846 p->tcfa_qstats.qlen) < 0)
847 goto errout;
848
849 if (gnet_stats_finish_copy(&d) < 0)
850 goto errout;
851
852 return 0;
853
854errout:
855 return -1;
856}
857
858static int tca_get_fill(struct sk_buff *skb, struct list_head *actions,
859 u32 portid, u32 seq, u16 flags, int event, int bind,
860 int ref)
861{
862 struct tcamsg *t;
863 struct nlmsghdr *nlh;
864 unsigned char *b = skb_tail_pointer(skb);
865 struct nlattr *nest;
866
867 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
868 if (!nlh)
869 goto out_nlmsg_trim;
870 t = nlmsg_data(nlh);
871 t->tca_family = AF_UNSPEC;
872 t->tca__pad1 = 0;
873 t->tca__pad2 = 0;
874
875 nest = nla_nest_start(skb, TCA_ACT_TAB);
876 if (!nest)
877 goto out_nlmsg_trim;
878
879 if (tcf_action_dump(skb, actions, bind, ref) < 0)
880 goto out_nlmsg_trim;
881
882 nla_nest_end(skb, nest);
883
884 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
885 return skb->len;
886
887out_nlmsg_trim:
888 nlmsg_trim(skb, b);
889 return -1;
890}
891
892static int
893tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
894 struct list_head *actions, int event,
895 struct netlink_ext_ack *extack)
896{
897 struct sk_buff *skb;
898
899 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
900 if (!skb)
901 return -ENOBUFS;
902 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
903 0, 0) <= 0) {
904 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
905 kfree_skb(skb);
906 return -EINVAL;
907 }
908
909 return rtnl_unicast(skb, net, portid);
910}
911
912static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
913 struct nlmsghdr *n, u32 portid,
914 struct netlink_ext_ack *extack)
915{
916 struct nlattr *tb[TCA_ACT_MAX + 1];
917 const struct tc_action_ops *ops;
918 struct tc_action *a;
919 int index;
920 int err;
921
922 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
923 if (err < 0)
924 goto err_out;
925
926 err = -EINVAL;
927 if (tb[TCA_ACT_INDEX] == NULL ||
928 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
929 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
930 goto err_out;
931 }
932 index = nla_get_u32(tb[TCA_ACT_INDEX]);
933
934 err = -EINVAL;
935 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
936 if (!ops) { /* could happen in batch of actions */
937 NL_SET_ERR_MSG(extack, "Specified TC action not found");
938 goto err_out;
939 }
940 err = -ENOENT;
941 if (ops->lookup(net, &a, index, extack) == 0)
942 goto err_mod;
943
944 module_put(ops->owner);
945 return a;
946
947err_mod:
948 module_put(ops->owner);
949err_out:
950 return ERR_PTR(err);
951}
952
953static int tca_action_flush(struct net *net, struct nlattr *nla,
954 struct nlmsghdr *n, u32 portid,
955 struct netlink_ext_ack *extack)
956{
957 struct sk_buff *skb;
958 unsigned char *b;
959 struct nlmsghdr *nlh;
960 struct tcamsg *t;
961 struct netlink_callback dcb;
962 struct nlattr *nest;
963 struct nlattr *tb[TCA_ACT_MAX + 1];
964 const struct tc_action_ops *ops;
965 struct nlattr *kind;
966 int err = -ENOMEM;
967
968 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
969 if (!skb)
970 return err;
971
972 b = skb_tail_pointer(skb);
973
974 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
975 if (err < 0)
976 goto err_out;
977
978 err = -EINVAL;
979 kind = tb[TCA_ACT_KIND];
980 ops = tc_lookup_action(kind);
981 if (!ops) { /*some idjot trying to flush unknown action */
982 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
983 goto err_out;
984 }
985
986 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
987 sizeof(*t), 0);
988 if (!nlh) {
989 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
990 goto out_module_put;
991 }
992 t = nlmsg_data(nlh);
993 t->tca_family = AF_UNSPEC;
994 t->tca__pad1 = 0;
995 t->tca__pad2 = 0;
996
997 nest = nla_nest_start(skb, TCA_ACT_TAB);
998 if (!nest) {
999 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1000 goto out_module_put;
1001 }
1002
1003 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1004 if (err <= 0) {
1005 nla_nest_cancel(skb, nest);
1006 goto out_module_put;
1007 }
1008
1009 nla_nest_end(skb, nest);
1010
1011 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1012 nlh->nlmsg_flags |= NLM_F_ROOT;
1013 module_put(ops->owner);
1014 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1015 n->nlmsg_flags & NLM_F_ECHO);
1016 if (err > 0)
1017 return 0;
1018 if (err < 0)
1019 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1020
1021 return err;
1022
1023out_module_put:
1024 module_put(ops->owner);
1025err_out:
1026 kfree_skb(skb);
1027 return err;
1028}
1029
1030static int
1031tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
1032 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1033{
1034 int ret;
1035 struct sk_buff *skb;
1036
1037 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1038 GFP_KERNEL);
1039 if (!skb)
1040 return -ENOBUFS;
1041
1042 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1043 0, 1) <= 0) {
1044 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1045 kfree_skb(skb);
1046 return -EINVAL;
1047 }
1048
1049 /* now do the delete */
1050 ret = tcf_action_destroy(actions, 0);
1051 if (ret < 0) {
1052 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1053 kfree_skb(skb);
1054 return ret;
1055 }
1056
1057 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1058 n->nlmsg_flags & NLM_F_ECHO);
1059 if (ret > 0)
1060 return 0;
1061 return ret;
1062}
1063
1064static int
1065tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1066 u32 portid, int event, struct netlink_ext_ack *extack)
1067{
1068 int i, ret;
1069 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1070 struct tc_action *act;
1071 size_t attr_size = 0;
1072 LIST_HEAD(actions);
1073
1074 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack);
1075 if (ret < 0)
1076 return ret;
1077
1078 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1079 if (tb[1])
1080 return tca_action_flush(net, tb[1], n, portid, extack);
1081
1082 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1083 return -EINVAL;
1084 }
1085
1086 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1087 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1088 if (IS_ERR(act)) {
1089 ret = PTR_ERR(act);
1090 goto err;
1091 }
1092 act->order = i;
1093 attr_size += tcf_action_fill_size(act);
1094 list_add_tail(&act->list, &actions);
1095 }
1096
1097 attr_size = tcf_action_full_attrs_size(attr_size);
1098
1099 if (event == RTM_GETACTION)
1100 ret = tcf_get_notify(net, portid, n, &actions, event, extack);
1101 else { /* delete */
1102 ret = tcf_del_notify(net, n, &actions, portid, attr_size, extack);
1103 if (ret)
1104 goto err;
1105 return ret;
1106 }
1107err:
1108 if (event != RTM_GETACTION)
1109 tcf_action_destroy(&actions, 0);
1110 return ret;
1111}
1112
1113static int
1114tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
1115 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1116{
1117 struct sk_buff *skb;
1118 int err = 0;
1119
1120 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1121 GFP_KERNEL);
1122 if (!skb)
1123 return -ENOBUFS;
1124
1125 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1126 RTM_NEWACTION, 0, 0) <= 0) {
1127 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1128 kfree_skb(skb);
1129 return -EINVAL;
1130 }
1131
1132 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1133 n->nlmsg_flags & NLM_F_ECHO);
1134 if (err > 0)
1135 err = 0;
1136 return err;
1137}
1138
1139static int tcf_action_add(struct net *net, struct nlattr *nla,
1140 struct nlmsghdr *n, u32 portid, int ovr,
1141 struct netlink_ext_ack *extack)
1142{
1143 size_t attr_size = 0;
1144 int ret = 0;
1145 LIST_HEAD(actions);
1146
1147 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, &actions,
1148 &attr_size, extack);
1149 if (ret)
1150 return ret;
1151
1152 return tcf_add_notify(net, n, &actions, portid, attr_size, extack);
1153}
1154
1155static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1156static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1157 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1158 .validation_data = &tcaa_root_flags_allowed },
1159 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1160};
1161
1162static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1163 struct netlink_ext_ack *extack)
1164{
1165 struct net *net = sock_net(skb->sk);
1166 struct nlattr *tca[TCA_ROOT_MAX + 1];
1167 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1168 int ret = 0, ovr = 0;
1169
1170 if ((n->nlmsg_type != RTM_GETACTION) &&
1171 !netlink_capable(skb, CAP_NET_ADMIN))
1172 return -EPERM;
1173
1174 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ROOT_MAX, NULL,
1175 extack);
1176 if (ret < 0)
1177 return ret;
1178
1179 if (tca[TCA_ACT_TAB] == NULL) {
1180 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1181 return -EINVAL;
1182 }
1183
1184 /* n->nlmsg_flags & NLM_F_CREATE */
1185 switch (n->nlmsg_type) {
1186 case RTM_NEWACTION:
1187 /* we are going to assume all other flags
1188 * imply create only if it doesn't exist
1189 * Note that CREATE | EXCL implies that
1190 * but since we want avoid ambiguity (eg when flags
1191 * is zero) then just set this
1192 */
1193 if (n->nlmsg_flags & NLM_F_REPLACE)
1194 ovr = 1;
1195replay:
1196 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1197 extack);
1198 if (ret == -EAGAIN)
1199 goto replay;
1200 break;
1201 case RTM_DELACTION:
1202 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1203 portid, RTM_DELACTION, extack);
1204 break;
1205 case RTM_GETACTION:
1206 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1207 portid, RTM_GETACTION, extack);
1208 break;
1209 default:
1210 BUG();
1211 }
1212
1213 return ret;
1214}
1215
1216static struct nlattr *find_dump_kind(struct nlattr **nla)
1217{
1218 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1219 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1220 struct nlattr *kind;
1221
1222 tb1 = nla[TCA_ACT_TAB];
1223 if (tb1 == NULL)
1224 return NULL;
1225
1226 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1227 NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1228 return NULL;
1229
1230 if (tb[1] == NULL)
1231 return NULL;
1232 if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
1233 return NULL;
1234 kind = tb2[TCA_ACT_KIND];
1235
1236 return kind;
1237}
1238
1239static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1240{
1241 struct net *net = sock_net(skb->sk);
1242 struct nlmsghdr *nlh;
1243 unsigned char *b = skb_tail_pointer(skb);
1244 struct nlattr *nest;
1245 struct tc_action_ops *a_o;
1246 int ret = 0;
1247 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1248 struct nlattr *tb[TCA_ROOT_MAX + 1];
1249 struct nlattr *count_attr = NULL;
1250 unsigned long jiffy_since = 0;
1251 struct nlattr *kind = NULL;
1252 struct nla_bitfield32 bf;
1253 u32 msecs_since = 0;
1254 u32 act_count = 0;
1255
1256 ret = nlmsg_parse(cb->nlh, sizeof(struct tcamsg), tb, TCA_ROOT_MAX,
1257 tcaa_policy, NULL);
1258 if (ret < 0)
1259 return ret;
1260
1261 kind = find_dump_kind(tb);
1262 if (kind == NULL) {
1263 pr_info("tc_dump_action: action bad kind\n");
1264 return 0;
1265 }
1266
1267 a_o = tc_lookup_action(kind);
1268 if (a_o == NULL)
1269 return 0;
1270
1271 cb->args[2] = 0;
1272 if (tb[TCA_ROOT_FLAGS]) {
1273 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1274 cb->args[2] = bf.value;
1275 }
1276
1277 if (tb[TCA_ROOT_TIME_DELTA]) {
1278 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1279 }
1280
1281 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1282 cb->nlh->nlmsg_type, sizeof(*t), 0);
1283 if (!nlh)
1284 goto out_module_put;
1285
1286 if (msecs_since)
1287 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1288
1289 t = nlmsg_data(nlh);
1290 t->tca_family = AF_UNSPEC;
1291 t->tca__pad1 = 0;
1292 t->tca__pad2 = 0;
1293 cb->args[3] = jiffy_since;
1294 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1295 if (!count_attr)
1296 goto out_module_put;
1297
1298 nest = nla_nest_start(skb, TCA_ACT_TAB);
1299 if (nest == NULL)
1300 goto out_module_put;
1301
1302 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1303 if (ret < 0)
1304 goto out_module_put;
1305
1306 if (ret > 0) {
1307 nla_nest_end(skb, nest);
1308 ret = skb->len;
1309 act_count = cb->args[1];
1310 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1311 cb->args[1] = 0;
1312 } else
1313 nlmsg_trim(skb, b);
1314
1315 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1316 if (NETLINK_CB(cb->skb).portid && ret)
1317 nlh->nlmsg_flags |= NLM_F_MULTI;
1318 module_put(a_o->owner);
1319 return skb->len;
1320
1321out_module_put:
1322 module_put(a_o->owner);
1323 nlmsg_trim(skb, b);
1324 return skb->len;
1325}
1326
1327struct tcf_action_net {
1328 struct rhashtable egdev_ht;
1329};
1330
1331static unsigned int tcf_action_net_id;
1332
1333struct tcf_action_egdev_cb {
1334 struct list_head list;
1335 tc_setup_cb_t *cb;
1336 void *cb_priv;
1337};
1338
1339struct tcf_action_egdev {
1340 struct rhash_head ht_node;
1341 const struct net_device *dev;
1342 unsigned int refcnt;
1343 struct list_head cb_list;
1344};
1345
1346static const struct rhashtable_params tcf_action_egdev_ht_params = {
1347 .key_offset = offsetof(struct tcf_action_egdev, dev),
1348 .head_offset = offsetof(struct tcf_action_egdev, ht_node),
1349 .key_len = sizeof(const struct net_device *),
1350};
1351
1352static struct tcf_action_egdev *
1353tcf_action_egdev_lookup(const struct net_device *dev)
1354{
1355 struct net *net = dev_net(dev);
1356 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1357
1358 return rhashtable_lookup_fast(&tan->egdev_ht, &dev,
1359 tcf_action_egdev_ht_params);
1360}
1361
1362static struct tcf_action_egdev *
1363tcf_action_egdev_get(const struct net_device *dev)
1364{
1365 struct tcf_action_egdev *egdev;
1366 struct tcf_action_net *tan;
1367
1368 egdev = tcf_action_egdev_lookup(dev);
1369 if (egdev)
1370 goto inc_ref;
1371
1372 egdev = kzalloc(sizeof(*egdev), GFP_KERNEL);
1373 if (!egdev)
1374 return NULL;
1375 INIT_LIST_HEAD(&egdev->cb_list);
1376 egdev->dev = dev;
1377 tan = net_generic(dev_net(dev), tcf_action_net_id);
1378 rhashtable_insert_fast(&tan->egdev_ht, &egdev->ht_node,
1379 tcf_action_egdev_ht_params);
1380
1381inc_ref:
1382 egdev->refcnt++;
1383 return egdev;
1384}
1385
1386static void tcf_action_egdev_put(struct tcf_action_egdev *egdev)
1387{
1388 struct tcf_action_net *tan;
1389
1390 if (--egdev->refcnt)
1391 return;
1392 tan = net_generic(dev_net(egdev->dev), tcf_action_net_id);
1393 rhashtable_remove_fast(&tan->egdev_ht, &egdev->ht_node,
1394 tcf_action_egdev_ht_params);
1395 kfree(egdev);
1396}
1397
1398static struct tcf_action_egdev_cb *
1399tcf_action_egdev_cb_lookup(struct tcf_action_egdev *egdev,
1400 tc_setup_cb_t *cb, void *cb_priv)
1401{
1402 struct tcf_action_egdev_cb *egdev_cb;
1403
1404 list_for_each_entry(egdev_cb, &egdev->cb_list, list)
1405 if (egdev_cb->cb == cb && egdev_cb->cb_priv == cb_priv)
1406 return egdev_cb;
1407 return NULL;
1408}
1409
1410static int tcf_action_egdev_cb_call(struct tcf_action_egdev *egdev,
1411 enum tc_setup_type type,
1412 void *type_data, bool err_stop)
1413{
1414 struct tcf_action_egdev_cb *egdev_cb;
1415 int ok_count = 0;
1416 int err;
1417
1418 list_for_each_entry(egdev_cb, &egdev->cb_list, list) {
1419 err = egdev_cb->cb(type, type_data, egdev_cb->cb_priv);
1420 if (err) {
1421 if (err_stop)
1422 return err;
1423 } else {
1424 ok_count++;
1425 }
1426 }
1427 return ok_count;
1428}
1429
1430static int tcf_action_egdev_cb_add(struct tcf_action_egdev *egdev,
1431 tc_setup_cb_t *cb, void *cb_priv)
1432{
1433 struct tcf_action_egdev_cb *egdev_cb;
1434
1435 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1436 if (WARN_ON(egdev_cb))
1437 return -EEXIST;
1438 egdev_cb = kzalloc(sizeof(*egdev_cb), GFP_KERNEL);
1439 if (!egdev_cb)
1440 return -ENOMEM;
1441 egdev_cb->cb = cb;
1442 egdev_cb->cb_priv = cb_priv;
1443 list_add(&egdev_cb->list, &egdev->cb_list);
1444 return 0;
1445}
1446
1447static void tcf_action_egdev_cb_del(struct tcf_action_egdev *egdev,
1448 tc_setup_cb_t *cb, void *cb_priv)
1449{
1450 struct tcf_action_egdev_cb *egdev_cb;
1451
1452 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1453 if (WARN_ON(!egdev_cb))
1454 return;
1455 list_del(&egdev_cb->list);
1456 kfree(egdev_cb);
1457}
1458
1459static int __tc_setup_cb_egdev_register(const struct net_device *dev,
1460 tc_setup_cb_t *cb, void *cb_priv)
1461{
1462 struct tcf_action_egdev *egdev = tcf_action_egdev_get(dev);
1463 int err;
1464
1465 if (!egdev)
1466 return -ENOMEM;
1467 err = tcf_action_egdev_cb_add(egdev, cb, cb_priv);
1468 if (err)
1469 goto err_cb_add;
1470 return 0;
1471
1472err_cb_add:
1473 tcf_action_egdev_put(egdev);
1474 return err;
1475}
1476int tc_setup_cb_egdev_register(const struct net_device *dev,
1477 tc_setup_cb_t *cb, void *cb_priv)
1478{
1479 int err;
1480
1481 rtnl_lock();
1482 err = __tc_setup_cb_egdev_register(dev, cb, cb_priv);
1483 rtnl_unlock();
1484 return err;
1485}
1486EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_register);
1487
1488static void __tc_setup_cb_egdev_unregister(const struct net_device *dev,
1489 tc_setup_cb_t *cb, void *cb_priv)
1490{
1491 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1492
1493 if (WARN_ON(!egdev))
1494 return;
1495 tcf_action_egdev_cb_del(egdev, cb, cb_priv);
1496 tcf_action_egdev_put(egdev);
1497}
1498void tc_setup_cb_egdev_unregister(const struct net_device *dev,
1499 tc_setup_cb_t *cb, void *cb_priv)
1500{
1501 rtnl_lock();
1502 __tc_setup_cb_egdev_unregister(dev, cb, cb_priv);
1503 rtnl_unlock();
1504}
1505EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_unregister);
1506
1507int tc_setup_cb_egdev_call(const struct net_device *dev,
1508 enum tc_setup_type type, void *type_data,
1509 bool err_stop)
1510{
1511 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1512
1513 if (!egdev)
1514 return 0;
1515 return tcf_action_egdev_cb_call(egdev, type, type_data, err_stop);
1516}
1517EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_call);
1518
1519static __net_init int tcf_action_net_init(struct net *net)
1520{
1521 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1522
1523 return rhashtable_init(&tan->egdev_ht, &tcf_action_egdev_ht_params);
1524}
1525
1526static void __net_exit tcf_action_net_exit(struct net *net)
1527{
1528 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1529
1530 rhashtable_destroy(&tan->egdev_ht);
1531}
1532
1533static struct pernet_operations tcf_action_net_ops = {
1534 .init = tcf_action_net_init,
1535 .exit = tcf_action_net_exit,
1536 .id = &tcf_action_net_id,
1537 .size = sizeof(struct tcf_action_net),
1538};
1539
1540static int __init tc_action_init(void)
1541{
1542 int err;
1543
1544 err = register_pernet_subsys(&tcf_action_net_ops);
1545 if (err)
1546 return err;
1547
1548 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1549 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1550 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1551 0);
1552
1553 return 0;
1554}
1555
1556subsys_initcall(tc_action_init);