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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 <net/net_namespace.h>
24#include <net/sock.h>
25#include <net/sch_generic.h>
26#include <net/act_api.h>
27#include <net/netlink.h>
28
29void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
30{
31 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
32 struct tcf_common **p1p;
33
34 for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
35 if (*p1p == p) {
36 write_lock_bh(hinfo->lock);
37 *p1p = p->tcfc_next;
38 write_unlock_bh(hinfo->lock);
39 gen_kill_estimator(&p->tcfc_bstats,
40 &p->tcfc_rate_est);
41 /*
42 * gen_estimator est_timer() might access p->tcfc_lock
43 * or bstats, wait a RCU grace period before freeing p
44 */
45 kfree_rcu(p, tcfc_rcu);
46 return;
47 }
48 }
49 WARN_ON(1);
50}
51EXPORT_SYMBOL(tcf_hash_destroy);
52
53int tcf_hash_release(struct tcf_common *p, int bind,
54 struct tcf_hashinfo *hinfo)
55{
56 int ret = 0;
57
58 if (p) {
59 if (bind)
60 p->tcfc_bindcnt--;
61
62 p->tcfc_refcnt--;
63 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
64 tcf_hash_destroy(p, hinfo);
65 ret = 1;
66 }
67 }
68 return ret;
69}
70EXPORT_SYMBOL(tcf_hash_release);
71
72static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
73 struct tc_action *a, struct tcf_hashinfo *hinfo)
74{
75 struct tcf_common *p;
76 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
77 struct nlattr *nest;
78
79 read_lock_bh(hinfo->lock);
80
81 s_i = cb->args[0];
82
83 for (i = 0; i < (hinfo->hmask + 1); i++) {
84 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
85
86 for (; p; p = p->tcfc_next) {
87 index++;
88 if (index < s_i)
89 continue;
90 a->priv = p;
91 a->order = n_i;
92
93 nest = nla_nest_start(skb, a->order);
94 if (nest == NULL)
95 goto nla_put_failure;
96 err = tcf_action_dump_1(skb, a, 0, 0);
97 if (err < 0) {
98 index--;
99 nlmsg_trim(skb, nest);
100 goto done;
101 }
102 nla_nest_end(skb, nest);
103 n_i++;
104 if (n_i >= TCA_ACT_MAX_PRIO)
105 goto done;
106 }
107 }
108done:
109 read_unlock_bh(hinfo->lock);
110 if (n_i)
111 cb->args[0] += n_i;
112 return n_i;
113
114nla_put_failure:
115 nla_nest_cancel(skb, nest);
116 goto done;
117}
118
119static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
120 struct tcf_hashinfo *hinfo)
121{
122 struct tcf_common *p, *s_p;
123 struct nlattr *nest;
124 int i = 0, n_i = 0;
125
126 nest = nla_nest_start(skb, a->order);
127 if (nest == NULL)
128 goto nla_put_failure;
129 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
130 for (i = 0; i < (hinfo->hmask + 1); i++) {
131 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
132
133 while (p != NULL) {
134 s_p = p->tcfc_next;
135 if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
136 module_put(a->ops->owner);
137 n_i++;
138 p = s_p;
139 }
140 }
141 NLA_PUT_U32(skb, TCA_FCNT, n_i);
142 nla_nest_end(skb, nest);
143
144 return n_i;
145nla_put_failure:
146 nla_nest_cancel(skb, nest);
147 return -EINVAL;
148}
149
150int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
151 int type, struct tc_action *a)
152{
153 struct tcf_hashinfo *hinfo = a->ops->hinfo;
154
155 if (type == RTM_DELACTION) {
156 return tcf_del_walker(skb, a, hinfo);
157 } else if (type == RTM_GETACTION) {
158 return tcf_dump_walker(skb, cb, a, hinfo);
159 } else {
160 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
161 return -EINVAL;
162 }
163}
164EXPORT_SYMBOL(tcf_generic_walker);
165
166struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
167{
168 struct tcf_common *p;
169
170 read_lock_bh(hinfo->lock);
171 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
172 p = p->tcfc_next) {
173 if (p->tcfc_index == index)
174 break;
175 }
176 read_unlock_bh(hinfo->lock);
177
178 return p;
179}
180EXPORT_SYMBOL(tcf_hash_lookup);
181
182u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
183{
184 u32 val = *idx_gen;
185
186 do {
187 if (++val == 0)
188 val = 1;
189 } while (tcf_hash_lookup(val, hinfo));
190
191 return (*idx_gen = val);
192}
193EXPORT_SYMBOL(tcf_hash_new_index);
194
195int tcf_hash_search(struct tc_action *a, u32 index)
196{
197 struct tcf_hashinfo *hinfo = a->ops->hinfo;
198 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
199
200 if (p) {
201 a->priv = p;
202 return 1;
203 }
204 return 0;
205}
206EXPORT_SYMBOL(tcf_hash_search);
207
208struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
209 struct tcf_hashinfo *hinfo)
210{
211 struct tcf_common *p = NULL;
212 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
213 if (bind)
214 p->tcfc_bindcnt++;
215 p->tcfc_refcnt++;
216 a->priv = p;
217 }
218 return p;
219}
220EXPORT_SYMBOL(tcf_hash_check);
221
222struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est,
223 struct tc_action *a, int size, int bind,
224 u32 *idx_gen, struct tcf_hashinfo *hinfo)
225{
226 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
227
228 if (unlikely(!p))
229 return ERR_PTR(-ENOMEM);
230 p->tcfc_refcnt = 1;
231 if (bind)
232 p->tcfc_bindcnt = 1;
233
234 spin_lock_init(&p->tcfc_lock);
235 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
236 p->tcfc_tm.install = jiffies;
237 p->tcfc_tm.lastuse = jiffies;
238 if (est) {
239 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
240 &p->tcfc_lock, est);
241 if (err) {
242 kfree(p);
243 return ERR_PTR(err);
244 }
245 }
246
247 a->priv = (void *) p;
248 return p;
249}
250EXPORT_SYMBOL(tcf_hash_create);
251
252void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
253{
254 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
255
256 write_lock_bh(hinfo->lock);
257 p->tcfc_next = hinfo->htab[h];
258 hinfo->htab[h] = p;
259 write_unlock_bh(hinfo->lock);
260}
261EXPORT_SYMBOL(tcf_hash_insert);
262
263static struct tc_action_ops *act_base = NULL;
264static DEFINE_RWLOCK(act_mod_lock);
265
266int tcf_register_action(struct tc_action_ops *act)
267{
268 struct tc_action_ops *a, **ap;
269
270 write_lock(&act_mod_lock);
271 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
272 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
273 write_unlock(&act_mod_lock);
274 return -EEXIST;
275 }
276 }
277 act->next = NULL;
278 *ap = act;
279 write_unlock(&act_mod_lock);
280 return 0;
281}
282EXPORT_SYMBOL(tcf_register_action);
283
284int tcf_unregister_action(struct tc_action_ops *act)
285{
286 struct tc_action_ops *a, **ap;
287 int err = -ENOENT;
288
289 write_lock(&act_mod_lock);
290 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
291 if (a == act)
292 break;
293 if (a) {
294 *ap = a->next;
295 a->next = NULL;
296 err = 0;
297 }
298 write_unlock(&act_mod_lock);
299 return err;
300}
301EXPORT_SYMBOL(tcf_unregister_action);
302
303/* lookup by name */
304static struct tc_action_ops *tc_lookup_action_n(char *kind)
305{
306 struct tc_action_ops *a = NULL;
307
308 if (kind) {
309 read_lock(&act_mod_lock);
310 for (a = act_base; a; a = a->next) {
311 if (strcmp(kind, a->kind) == 0) {
312 if (!try_module_get(a->owner)) {
313 read_unlock(&act_mod_lock);
314 return NULL;
315 }
316 break;
317 }
318 }
319 read_unlock(&act_mod_lock);
320 }
321 return a;
322}
323
324/* lookup by nlattr */
325static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
326{
327 struct tc_action_ops *a = NULL;
328
329 if (kind) {
330 read_lock(&act_mod_lock);
331 for (a = act_base; a; a = a->next) {
332 if (nla_strcmp(kind, a->kind) == 0) {
333 if (!try_module_get(a->owner)) {
334 read_unlock(&act_mod_lock);
335 return NULL;
336 }
337 break;
338 }
339 }
340 read_unlock(&act_mod_lock);
341 }
342 return a;
343}
344
345#if 0
346/* lookup by id */
347static struct tc_action_ops *tc_lookup_action_id(u32 type)
348{
349 struct tc_action_ops *a = NULL;
350
351 if (type) {
352 read_lock(&act_mod_lock);
353 for (a = act_base; a; a = a->next) {
354 if (a->type == type) {
355 if (!try_module_get(a->owner)) {
356 read_unlock(&act_mod_lock);
357 return NULL;
358 }
359 break;
360 }
361 }
362 read_unlock(&act_mod_lock);
363 }
364 return a;
365}
366#endif
367
368int tcf_action_exec(struct sk_buff *skb, const struct tc_action *act,
369 struct tcf_result *res)
370{
371 const struct tc_action *a;
372 int ret = -1;
373
374 if (skb->tc_verd & TC_NCLS) {
375 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
376 ret = TC_ACT_OK;
377 goto exec_done;
378 }
379 while ((a = act) != NULL) {
380repeat:
381 if (a->ops && a->ops->act) {
382 ret = a->ops->act(skb, a, res);
383 if (TC_MUNGED & skb->tc_verd) {
384 /* copied already, allow trampling */
385 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
386 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
387 }
388 if (ret == TC_ACT_REPEAT)
389 goto repeat; /* we need a ttl - JHS */
390 if (ret != TC_ACT_PIPE)
391 goto exec_done;
392 }
393 act = a->next;
394 }
395exec_done:
396 return ret;
397}
398EXPORT_SYMBOL(tcf_action_exec);
399
400void tcf_action_destroy(struct tc_action *act, int bind)
401{
402 struct tc_action *a;
403
404 for (a = act; a; a = act) {
405 if (a->ops && a->ops->cleanup) {
406 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
407 module_put(a->ops->owner);
408 act = act->next;
409 kfree(a);
410 } else {
411 /*FIXME: Remove later - catch insertion bugs*/
412 WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n");
413 act = act->next;
414 kfree(a);
415 }
416 }
417}
418
419int
420tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
421{
422 int err = -EINVAL;
423
424 if (a->ops == NULL || a->ops->dump == NULL)
425 return err;
426 return a->ops->dump(skb, a, bind, ref);
427}
428
429int
430tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
431{
432 int err = -EINVAL;
433 unsigned char *b = skb_tail_pointer(skb);
434 struct nlattr *nest;
435
436 if (a->ops == NULL || a->ops->dump == NULL)
437 return err;
438
439 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
440 if (tcf_action_copy_stats(skb, a, 0))
441 goto nla_put_failure;
442 nest = nla_nest_start(skb, TCA_OPTIONS);
443 if (nest == NULL)
444 goto nla_put_failure;
445 err = tcf_action_dump_old(skb, a, bind, ref);
446 if (err > 0) {
447 nla_nest_end(skb, nest);
448 return err;
449 }
450
451nla_put_failure:
452 nlmsg_trim(skb, b);
453 return -1;
454}
455EXPORT_SYMBOL(tcf_action_dump_1);
456
457int
458tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
459{
460 struct tc_action *a;
461 int err = -EINVAL;
462 struct nlattr *nest;
463
464 while ((a = act) != NULL) {
465 act = a->next;
466 nest = nla_nest_start(skb, a->order);
467 if (nest == NULL)
468 goto nla_put_failure;
469 err = tcf_action_dump_1(skb, a, bind, ref);
470 if (err < 0)
471 goto errout;
472 nla_nest_end(skb, nest);
473 }
474
475 return 0;
476
477nla_put_failure:
478 err = -EINVAL;
479errout:
480 nla_nest_cancel(skb, nest);
481 return err;
482}
483
484struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
485 char *name, int ovr, int bind)
486{
487 struct tc_action *a;
488 struct tc_action_ops *a_o;
489 char act_name[IFNAMSIZ];
490 struct nlattr *tb[TCA_ACT_MAX + 1];
491 struct nlattr *kind;
492 int err;
493
494 if (name == NULL) {
495 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
496 if (err < 0)
497 goto err_out;
498 err = -EINVAL;
499 kind = tb[TCA_ACT_KIND];
500 if (kind == NULL)
501 goto err_out;
502 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
503 goto err_out;
504 } else {
505 err = -EINVAL;
506 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
507 goto err_out;
508 }
509
510 a_o = tc_lookup_action_n(act_name);
511 if (a_o == NULL) {
512#ifdef CONFIG_MODULES
513 rtnl_unlock();
514 request_module("act_%s", act_name);
515 rtnl_lock();
516
517 a_o = tc_lookup_action_n(act_name);
518
519 /* We dropped the RTNL semaphore in order to
520 * perform the module load. So, even if we
521 * succeeded in loading the module we have to
522 * tell the caller to replay the request. We
523 * indicate this using -EAGAIN.
524 */
525 if (a_o != NULL) {
526 err = -EAGAIN;
527 goto err_mod;
528 }
529#endif
530 err = -ENOENT;
531 goto err_out;
532 }
533
534 err = -ENOMEM;
535 a = kzalloc(sizeof(*a), GFP_KERNEL);
536 if (a == NULL)
537 goto err_mod;
538
539 /* backward compatibility for policer */
540 if (name == NULL)
541 err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
542 else
543 err = a_o->init(nla, est, a, ovr, bind);
544 if (err < 0)
545 goto err_free;
546
547 /* module count goes up only when brand new policy is created
548 * if it exists and is only bound to in a_o->init() then
549 * ACT_P_CREATED is not returned (a zero is).
550 */
551 if (err != ACT_P_CREATED)
552 module_put(a_o->owner);
553 a->ops = a_o;
554
555 return a;
556
557err_free:
558 kfree(a);
559err_mod:
560 module_put(a_o->owner);
561err_out:
562 return ERR_PTR(err);
563}
564
565struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
566 char *name, int ovr, int bind)
567{
568 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
569 struct tc_action *head = NULL, *act, *act_prev = NULL;
570 int err;
571 int i;
572
573 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
574 if (err < 0)
575 return ERR_PTR(err);
576
577 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
578 act = tcf_action_init_1(tb[i], est, name, ovr, bind);
579 if (IS_ERR(act))
580 goto err;
581 act->order = i;
582
583 if (head == NULL)
584 head = act;
585 else
586 act_prev->next = act;
587 act_prev = act;
588 }
589 return head;
590
591err:
592 if (head != NULL)
593 tcf_action_destroy(head, bind);
594 return act;
595}
596
597int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
598 int compat_mode)
599{
600 int err = 0;
601 struct gnet_dump d;
602 struct tcf_act_hdr *h = a->priv;
603
604 if (h == NULL)
605 goto errout;
606
607 /* compat_mode being true specifies a call that is supposed
608 * to add additional backward compatibility statistic TLVs.
609 */
610 if (compat_mode) {
611 if (a->type == TCA_OLD_COMPAT)
612 err = gnet_stats_start_copy_compat(skb, 0,
613 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
614 else
615 return 0;
616 } else
617 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
618 &h->tcf_lock, &d);
619
620 if (err < 0)
621 goto errout;
622
623 if (a->ops != NULL && a->ops->get_stats != NULL)
624 if (a->ops->get_stats(skb, a) < 0)
625 goto errout;
626
627 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
628 gnet_stats_copy_rate_est(&d, &h->tcf_bstats,
629 &h->tcf_rate_est) < 0 ||
630 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
631 goto errout;
632
633 if (gnet_stats_finish_copy(&d) < 0)
634 goto errout;
635
636 return 0;
637
638errout:
639 return -1;
640}
641
642static int
643tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
644 u16 flags, int event, int bind, int ref)
645{
646 struct tcamsg *t;
647 struct nlmsghdr *nlh;
648 unsigned char *b = skb_tail_pointer(skb);
649 struct nlattr *nest;
650
651 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
652
653 t = NLMSG_DATA(nlh);
654 t->tca_family = AF_UNSPEC;
655 t->tca__pad1 = 0;
656 t->tca__pad2 = 0;
657
658 nest = nla_nest_start(skb, TCA_ACT_TAB);
659 if (nest == NULL)
660 goto nla_put_failure;
661
662 if (tcf_action_dump(skb, a, bind, ref) < 0)
663 goto nla_put_failure;
664
665 nla_nest_end(skb, nest);
666
667 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
668 return skb->len;
669
670nla_put_failure:
671nlmsg_failure:
672 nlmsg_trim(skb, b);
673 return -1;
674}
675
676static int
677act_get_notify(struct net *net, u32 pid, struct nlmsghdr *n,
678 struct tc_action *a, int event)
679{
680 struct sk_buff *skb;
681
682 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
683 if (!skb)
684 return -ENOBUFS;
685 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
686 kfree_skb(skb);
687 return -EINVAL;
688 }
689
690 return rtnl_unicast(skb, net, pid);
691}
692
693static struct tc_action *
694tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
695{
696 struct nlattr *tb[TCA_ACT_MAX + 1];
697 struct tc_action *a;
698 int index;
699 int err;
700
701 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
702 if (err < 0)
703 goto err_out;
704
705 err = -EINVAL;
706 if (tb[TCA_ACT_INDEX] == NULL ||
707 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
708 goto err_out;
709 index = nla_get_u32(tb[TCA_ACT_INDEX]);
710
711 err = -ENOMEM;
712 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
713 if (a == NULL)
714 goto err_out;
715
716 err = -EINVAL;
717 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
718 if (a->ops == NULL)
719 goto err_free;
720 if (a->ops->lookup == NULL)
721 goto err_mod;
722 err = -ENOENT;
723 if (a->ops->lookup(a, index) == 0)
724 goto err_mod;
725
726 module_put(a->ops->owner);
727 return a;
728
729err_mod:
730 module_put(a->ops->owner);
731err_free:
732 kfree(a);
733err_out:
734 return ERR_PTR(err);
735}
736
737static void cleanup_a(struct tc_action *act)
738{
739 struct tc_action *a;
740
741 for (a = act; a; a = act) {
742 act = a->next;
743 kfree(a);
744 }
745}
746
747static struct tc_action *create_a(int i)
748{
749 struct tc_action *act;
750
751 act = kzalloc(sizeof(*act), GFP_KERNEL);
752 if (act == NULL) {
753 pr_debug("create_a: failed to alloc!\n");
754 return NULL;
755 }
756 act->order = i;
757 return act;
758}
759
760static int tca_action_flush(struct net *net, struct nlattr *nla,
761 struct nlmsghdr *n, u32 pid)
762{
763 struct sk_buff *skb;
764 unsigned char *b;
765 struct nlmsghdr *nlh;
766 struct tcamsg *t;
767 struct netlink_callback dcb;
768 struct nlattr *nest;
769 struct nlattr *tb[TCA_ACT_MAX + 1];
770 struct nlattr *kind;
771 struct tc_action *a = create_a(0);
772 int err = -ENOMEM;
773
774 if (a == NULL) {
775 pr_debug("tca_action_flush: couldnt create tc_action\n");
776 return err;
777 }
778
779 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
780 if (!skb) {
781 pr_debug("tca_action_flush: failed skb alloc\n");
782 kfree(a);
783 return err;
784 }
785
786 b = skb_tail_pointer(skb);
787
788 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
789 if (err < 0)
790 goto err_out;
791
792 err = -EINVAL;
793 kind = tb[TCA_ACT_KIND];
794 a->ops = tc_lookup_action(kind);
795 if (a->ops == NULL)
796 goto err_out;
797
798 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
799 t = NLMSG_DATA(nlh);
800 t->tca_family = AF_UNSPEC;
801 t->tca__pad1 = 0;
802 t->tca__pad2 = 0;
803
804 nest = nla_nest_start(skb, TCA_ACT_TAB);
805 if (nest == NULL)
806 goto nla_put_failure;
807
808 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
809 if (err < 0)
810 goto nla_put_failure;
811 if (err == 0)
812 goto noflush_out;
813
814 nla_nest_end(skb, nest);
815
816 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
817 nlh->nlmsg_flags |= NLM_F_ROOT;
818 module_put(a->ops->owner);
819 kfree(a);
820 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC,
821 n->nlmsg_flags & NLM_F_ECHO);
822 if (err > 0)
823 return 0;
824
825 return err;
826
827nla_put_failure:
828nlmsg_failure:
829 module_put(a->ops->owner);
830err_out:
831noflush_out:
832 kfree_skb(skb);
833 kfree(a);
834 return err;
835}
836
837static int
838tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
839 u32 pid, int event)
840{
841 int i, ret;
842 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
843 struct tc_action *head = NULL, *act, *act_prev = NULL;
844
845 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
846 if (ret < 0)
847 return ret;
848
849 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
850 if (tb[1] != NULL)
851 return tca_action_flush(net, tb[1], n, pid);
852 else
853 return -EINVAL;
854 }
855
856 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
857 act = tcf_action_get_1(tb[i], n, pid);
858 if (IS_ERR(act)) {
859 ret = PTR_ERR(act);
860 goto err;
861 }
862 act->order = i;
863
864 if (head == NULL)
865 head = act;
866 else
867 act_prev->next = act;
868 act_prev = act;
869 }
870
871 if (event == RTM_GETACTION)
872 ret = act_get_notify(net, pid, n, head, event);
873 else { /* delete */
874 struct sk_buff *skb;
875
876 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
877 if (!skb) {
878 ret = -ENOBUFS;
879 goto err;
880 }
881
882 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
883 0, 1) <= 0) {
884 kfree_skb(skb);
885 ret = -EINVAL;
886 goto err;
887 }
888
889 /* now do the delete */
890 tcf_action_destroy(head, 0);
891 ret = rtnetlink_send(skb, net, pid, RTNLGRP_TC,
892 n->nlmsg_flags & NLM_F_ECHO);
893 if (ret > 0)
894 return 0;
895 return ret;
896 }
897err:
898 cleanup_a(head);
899 return ret;
900}
901
902static int tcf_add_notify(struct net *net, struct tc_action *a,
903 u32 pid, u32 seq, int event, u16 flags)
904{
905 struct tcamsg *t;
906 struct nlmsghdr *nlh;
907 struct sk_buff *skb;
908 struct nlattr *nest;
909 unsigned char *b;
910 int err = 0;
911
912 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
913 if (!skb)
914 return -ENOBUFS;
915
916 b = skb_tail_pointer(skb);
917
918 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
919 t = NLMSG_DATA(nlh);
920 t->tca_family = AF_UNSPEC;
921 t->tca__pad1 = 0;
922 t->tca__pad2 = 0;
923
924 nest = nla_nest_start(skb, TCA_ACT_TAB);
925 if (nest == NULL)
926 goto nla_put_failure;
927
928 if (tcf_action_dump(skb, a, 0, 0) < 0)
929 goto nla_put_failure;
930
931 nla_nest_end(skb, nest);
932
933 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
934 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
935
936 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags & NLM_F_ECHO);
937 if (err > 0)
938 err = 0;
939 return err;
940
941nla_put_failure:
942nlmsg_failure:
943 kfree_skb(skb);
944 return -1;
945}
946
947
948static int
949tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
950 u32 pid, int ovr)
951{
952 int ret = 0;
953 struct tc_action *act;
954 struct tc_action *a;
955 u32 seq = n->nlmsg_seq;
956
957 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
958 if (act == NULL)
959 goto done;
960 if (IS_ERR(act)) {
961 ret = PTR_ERR(act);
962 goto done;
963 }
964
965 /* dump then free all the actions after update; inserted policy
966 * stays intact
967 */
968 ret = tcf_add_notify(net, act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
969 for (a = act; a; a = act) {
970 act = a->next;
971 kfree(a);
972 }
973done:
974 return ret;
975}
976
977static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
978{
979 struct net *net = sock_net(skb->sk);
980 struct nlattr *tca[TCA_ACT_MAX + 1];
981 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
982 int ret = 0, ovr = 0;
983
984 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
985 if (ret < 0)
986 return ret;
987
988 if (tca[TCA_ACT_TAB] == NULL) {
989 pr_notice("tc_ctl_action: received NO action attribs\n");
990 return -EINVAL;
991 }
992
993 /* n->nlmsg_flags & NLM_F_CREATE */
994 switch (n->nlmsg_type) {
995 case RTM_NEWACTION:
996 /* we are going to assume all other flags
997 * imply create only if it doesn't exist
998 * Note that CREATE | EXCL implies that
999 * but since we want avoid ambiguity (eg when flags
1000 * is zero) then just set this
1001 */
1002 if (n->nlmsg_flags & NLM_F_REPLACE)
1003 ovr = 1;
1004replay:
1005 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, pid, ovr);
1006 if (ret == -EAGAIN)
1007 goto replay;
1008 break;
1009 case RTM_DELACTION:
1010 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1011 pid, RTM_DELACTION);
1012 break;
1013 case RTM_GETACTION:
1014 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1015 pid, RTM_GETACTION);
1016 break;
1017 default:
1018 BUG();
1019 }
1020
1021 return ret;
1022}
1023
1024static struct nlattr *
1025find_dump_kind(const struct nlmsghdr *n)
1026{
1027 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1028 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1029 struct nlattr *nla[TCAA_MAX + 1];
1030 struct nlattr *kind;
1031
1032 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1033 return NULL;
1034 tb1 = nla[TCA_ACT_TAB];
1035 if (tb1 == NULL)
1036 return NULL;
1037
1038 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1039 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1040 return NULL;
1041
1042 if (tb[1] == NULL)
1043 return NULL;
1044 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1045 nla_len(tb[1]), NULL) < 0)
1046 return NULL;
1047 kind = tb2[TCA_ACT_KIND];
1048
1049 return kind;
1050}
1051
1052static int
1053tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1054{
1055 struct nlmsghdr *nlh;
1056 unsigned char *b = skb_tail_pointer(skb);
1057 struct nlattr *nest;
1058 struct tc_action_ops *a_o;
1059 struct tc_action a;
1060 int ret = 0;
1061 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
1062 struct nlattr *kind = find_dump_kind(cb->nlh);
1063
1064 if (kind == NULL) {
1065 pr_info("tc_dump_action: action bad kind\n");
1066 return 0;
1067 }
1068
1069 a_o = tc_lookup_action(kind);
1070 if (a_o == NULL)
1071 return 0;
1072
1073 memset(&a, 0, sizeof(struct tc_action));
1074 a.ops = a_o;
1075
1076 if (a_o->walk == NULL) {
1077 WARN(1, "tc_dump_action: %s !capable of dumping table\n",
1078 a_o->kind);
1079 goto nla_put_failure;
1080 }
1081
1082 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
1083 cb->nlh->nlmsg_type, sizeof(*t));
1084 t = NLMSG_DATA(nlh);
1085 t->tca_family = AF_UNSPEC;
1086 t->tca__pad1 = 0;
1087 t->tca__pad2 = 0;
1088
1089 nest = nla_nest_start(skb, TCA_ACT_TAB);
1090 if (nest == NULL)
1091 goto nla_put_failure;
1092
1093 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1094 if (ret < 0)
1095 goto nla_put_failure;
1096
1097 if (ret > 0) {
1098 nla_nest_end(skb, nest);
1099 ret = skb->len;
1100 } else
1101 nla_nest_cancel(skb, nest);
1102
1103 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1104 if (NETLINK_CB(cb->skb).pid && ret)
1105 nlh->nlmsg_flags |= NLM_F_MULTI;
1106 module_put(a_o->owner);
1107 return skb->len;
1108
1109nla_put_failure:
1110nlmsg_failure:
1111 module_put(a_o->owner);
1112 nlmsg_trim(skb, b);
1113 return skb->len;
1114}
1115
1116static int __init tc_action_init(void)
1117{
1118 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1119 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1120 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1121 NULL);
1122
1123 return 0;
1124}
1125
1126subsys_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);