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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 tc_action *a)
31{
32 struct tcf_common *p = a->priv;
33 struct tcf_hashinfo *hinfo = a->ops->hinfo;
34
35 spin_lock_bh(&hinfo->lock);
36 hlist_del(&p->tcfc_head);
37 spin_unlock_bh(&hinfo->lock);
38 gen_kill_estimator(&p->tcfc_bstats,
39 &p->tcfc_rate_est);
40 /*
41 * gen_estimator est_timer() might access p->tcfc_lock
42 * or bstats, wait a RCU grace period before freeing p
43 */
44 kfree_rcu(p, tcfc_rcu);
45}
46EXPORT_SYMBOL(tcf_hash_destroy);
47
48int tcf_hash_release(struct tc_action *a, int bind)
49{
50 struct tcf_common *p = a->priv;
51 int ret = 0;
52
53 if (p) {
54 if (bind)
55 p->tcfc_bindcnt--;
56 else if (p->tcfc_bindcnt > 0)
57 return -EPERM;
58
59 p->tcfc_refcnt--;
60 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
61 if (a->ops->cleanup)
62 a->ops->cleanup(a, bind);
63 tcf_hash_destroy(a);
64 ret = 1;
65 }
66 }
67 return ret;
68}
69EXPORT_SYMBOL(tcf_hash_release);
70
71static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
72 struct tc_action *a)
73{
74 struct tcf_hashinfo *hinfo = a->ops->hinfo;
75 struct hlist_head *head;
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 spin_lock_bh(&hinfo->lock);
81
82 s_i = cb->args[0];
83
84 for (i = 0; i < (hinfo->hmask + 1); i++) {
85 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
86
87 hlist_for_each_entry_rcu(p, head, tcfc_head) {
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 spin_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{
122 struct tcf_hashinfo *hinfo = a->ops->hinfo;
123 struct hlist_head *head;
124 struct hlist_node *n;
125 struct tcf_common *p;
126 struct nlattr *nest;
127 int i = 0, n_i = 0;
128 int ret = -EINVAL;
129
130 nest = nla_nest_start(skb, a->order);
131 if (nest == NULL)
132 goto nla_put_failure;
133 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
134 goto nla_put_failure;
135 for (i = 0; i < (hinfo->hmask + 1); i++) {
136 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
137 hlist_for_each_entry_safe(p, n, head, tcfc_head) {
138 a->priv = p;
139 ret = tcf_hash_release(a, 0);
140 if (ret == ACT_P_DELETED) {
141 module_put(a->ops->owner);
142 n_i++;
143 } else if (ret < 0)
144 goto nla_put_failure;
145 }
146 }
147 if (nla_put_u32(skb, TCA_FCNT, n_i))
148 goto nla_put_failure;
149 nla_nest_end(skb, nest);
150
151 return n_i;
152nla_put_failure:
153 nla_nest_cancel(skb, nest);
154 return ret;
155}
156
157static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
158 int type, struct tc_action *a)
159{
160 if (type == RTM_DELACTION) {
161 return tcf_del_walker(skb, a);
162 } else if (type == RTM_GETACTION) {
163 return tcf_dump_walker(skb, cb, a);
164 } else {
165 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
166 return -EINVAL;
167 }
168}
169
170static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
171{
172 struct tcf_common *p = NULL;
173 struct hlist_head *head;
174
175 spin_lock_bh(&hinfo->lock);
176 head = &hinfo->htab[tcf_hash(index, hinfo->hmask)];
177 hlist_for_each_entry_rcu(p, head, tcfc_head)
178 if (p->tcfc_index == index)
179 break;
180 spin_unlock_bh(&hinfo->lock);
181
182 return p;
183}
184
185u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo)
186{
187 u32 val = hinfo->index;
188
189 do {
190 if (++val == 0)
191 val = 1;
192 } while (tcf_hash_lookup(val, hinfo));
193
194 hinfo->index = val;
195 return val;
196}
197EXPORT_SYMBOL(tcf_hash_new_index);
198
199int tcf_hash_search(struct tc_action *a, u32 index)
200{
201 struct tcf_hashinfo *hinfo = a->ops->hinfo;
202 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
203
204 if (p) {
205 a->priv = p;
206 return 1;
207 }
208 return 0;
209}
210EXPORT_SYMBOL(tcf_hash_search);
211
212int tcf_hash_check(u32 index, struct tc_action *a, int bind)
213{
214 struct tcf_hashinfo *hinfo = a->ops->hinfo;
215 struct tcf_common *p = NULL;
216 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
217 if (bind)
218 p->tcfc_bindcnt++;
219 p->tcfc_refcnt++;
220 a->priv = p;
221 return 1;
222 }
223 return 0;
224}
225EXPORT_SYMBOL(tcf_hash_check);
226
227void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est)
228{
229 struct tcf_common *pc = a->priv;
230 if (est)
231 gen_kill_estimator(&pc->tcfc_bstats,
232 &pc->tcfc_rate_est);
233 kfree_rcu(pc, tcfc_rcu);
234}
235EXPORT_SYMBOL(tcf_hash_cleanup);
236
237int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a,
238 int size, int bind)
239{
240 struct tcf_hashinfo *hinfo = a->ops->hinfo;
241 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
242
243 if (unlikely(!p))
244 return -ENOMEM;
245 p->tcfc_refcnt = 1;
246 if (bind)
247 p->tcfc_bindcnt = 1;
248
249 spin_lock_init(&p->tcfc_lock);
250 INIT_HLIST_NODE(&p->tcfc_head);
251 p->tcfc_index = index ? index : tcf_hash_new_index(hinfo);
252 p->tcfc_tm.install = jiffies;
253 p->tcfc_tm.lastuse = jiffies;
254 if (est) {
255 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
256 &p->tcfc_lock, est);
257 if (err) {
258 kfree(p);
259 return err;
260 }
261 }
262
263 a->priv = (void *) p;
264 return 0;
265}
266EXPORT_SYMBOL(tcf_hash_create);
267
268void tcf_hash_insert(struct tc_action *a)
269{
270 struct tcf_common *p = a->priv;
271 struct tcf_hashinfo *hinfo = a->ops->hinfo;
272 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
273
274 spin_lock_bh(&hinfo->lock);
275 hlist_add_head(&p->tcfc_head, &hinfo->htab[h]);
276 spin_unlock_bh(&hinfo->lock);
277}
278EXPORT_SYMBOL(tcf_hash_insert);
279
280static LIST_HEAD(act_base);
281static DEFINE_RWLOCK(act_mod_lock);
282
283int tcf_register_action(struct tc_action_ops *act, unsigned int mask)
284{
285 struct tc_action_ops *a;
286 int err;
287
288 /* Must supply act, dump and init */
289 if (!act->act || !act->dump || !act->init)
290 return -EINVAL;
291
292 /* Supply defaults */
293 if (!act->lookup)
294 act->lookup = tcf_hash_search;
295 if (!act->walk)
296 act->walk = tcf_generic_walker;
297
298 act->hinfo = kmalloc(sizeof(struct tcf_hashinfo), GFP_KERNEL);
299 if (!act->hinfo)
300 return -ENOMEM;
301 err = tcf_hashinfo_init(act->hinfo, mask);
302 if (err) {
303 kfree(act->hinfo);
304 return err;
305 }
306
307 write_lock(&act_mod_lock);
308 list_for_each_entry(a, &act_base, head) {
309 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
310 write_unlock(&act_mod_lock);
311 tcf_hashinfo_destroy(act->hinfo);
312 kfree(act->hinfo);
313 return -EEXIST;
314 }
315 }
316 list_add_tail(&act->head, &act_base);
317 write_unlock(&act_mod_lock);
318 return 0;
319}
320EXPORT_SYMBOL(tcf_register_action);
321
322int tcf_unregister_action(struct tc_action_ops *act)
323{
324 struct tc_action_ops *a;
325 int err = -ENOENT;
326
327 write_lock(&act_mod_lock);
328 list_for_each_entry(a, &act_base, head) {
329 if (a == act) {
330 list_del(&act->head);
331 tcf_hashinfo_destroy(act->hinfo);
332 kfree(act->hinfo);
333 err = 0;
334 break;
335 }
336 }
337 write_unlock(&act_mod_lock);
338 return err;
339}
340EXPORT_SYMBOL(tcf_unregister_action);
341
342/* lookup by name */
343static struct tc_action_ops *tc_lookup_action_n(char *kind)
344{
345 struct tc_action_ops *a, *res = NULL;
346
347 if (kind) {
348 read_lock(&act_mod_lock);
349 list_for_each_entry(a, &act_base, head) {
350 if (strcmp(kind, a->kind) == 0) {
351 if (try_module_get(a->owner))
352 res = a;
353 break;
354 }
355 }
356 read_unlock(&act_mod_lock);
357 }
358 return res;
359}
360
361/* lookup by nlattr */
362static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
363{
364 struct tc_action_ops *a, *res = NULL;
365
366 if (kind) {
367 read_lock(&act_mod_lock);
368 list_for_each_entry(a, &act_base, head) {
369 if (nla_strcmp(kind, a->kind) == 0) {
370 if (try_module_get(a->owner))
371 res = a;
372 break;
373 }
374 }
375 read_unlock(&act_mod_lock);
376 }
377 return res;
378}
379
380int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
381 struct tcf_result *res)
382{
383 const struct tc_action *a;
384 int ret = -1;
385
386 if (skb->tc_verd & TC_NCLS) {
387 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
388 ret = TC_ACT_OK;
389 goto exec_done;
390 }
391 list_for_each_entry(a, actions, list) {
392repeat:
393 ret = a->ops->act(skb, a, res);
394 if (TC_MUNGED & skb->tc_verd) {
395 /* copied already, allow trampling */
396 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
397 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
398 }
399 if (ret == TC_ACT_REPEAT)
400 goto repeat; /* we need a ttl - JHS */
401 if (ret != TC_ACT_PIPE)
402 goto exec_done;
403 }
404exec_done:
405 return ret;
406}
407EXPORT_SYMBOL(tcf_action_exec);
408
409int tcf_action_destroy(struct list_head *actions, int bind)
410{
411 struct tc_action *a, *tmp;
412 int ret = 0;
413
414 list_for_each_entry_safe(a, tmp, actions, list) {
415 ret = tcf_hash_release(a, bind);
416 if (ret == ACT_P_DELETED)
417 module_put(a->ops->owner);
418 else if (ret < 0)
419 return ret;
420 list_del(&a->list);
421 kfree(a);
422 }
423 return ret;
424}
425
426int
427tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
428{
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 (nla_put_string(skb, TCA_KIND, a->ops->kind))
440 goto nla_put_failure;
441 if (tcf_action_copy_stats(skb, a, 0))
442 goto nla_put_failure;
443 nest = nla_nest_start(skb, TCA_OPTIONS);
444 if (nest == NULL)
445 goto nla_put_failure;
446 err = tcf_action_dump_old(skb, a, bind, ref);
447 if (err > 0) {
448 nla_nest_end(skb, nest);
449 return err;
450 }
451
452nla_put_failure:
453 nlmsg_trim(skb, b);
454 return -1;
455}
456EXPORT_SYMBOL(tcf_action_dump_1);
457
458int
459tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref)
460{
461 struct tc_action *a;
462 int err = -EINVAL;
463 struct nlattr *nest;
464
465 list_for_each_entry(a, actions, list) {
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 net *net, struct nlattr *nla,
485 struct nlattr *est, char *name, int ovr,
486 int bind)
487{
488 struct tc_action *a;
489 struct tc_action_ops *a_o;
490 char act_name[IFNAMSIZ];
491 struct nlattr *tb[TCA_ACT_MAX + 1];
492 struct nlattr *kind;
493 int err;
494
495 if (name == NULL) {
496 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
497 if (err < 0)
498 goto err_out;
499 err = -EINVAL;
500 kind = tb[TCA_ACT_KIND];
501 if (kind == NULL)
502 goto err_out;
503 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
504 goto err_out;
505 } else {
506 err = -EINVAL;
507 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
508 goto err_out;
509 }
510
511 a_o = tc_lookup_action_n(act_name);
512 if (a_o == NULL) {
513#ifdef CONFIG_MODULES
514 rtnl_unlock();
515 request_module("act_%s", act_name);
516 rtnl_lock();
517
518 a_o = tc_lookup_action_n(act_name);
519
520 /* We dropped the RTNL semaphore in order to
521 * perform the module load. So, even if we
522 * succeeded in loading the module we have to
523 * tell the caller to replay the request. We
524 * indicate this using -EAGAIN.
525 */
526 if (a_o != NULL) {
527 err = -EAGAIN;
528 goto err_mod;
529 }
530#endif
531 err = -ENOENT;
532 goto err_out;
533 }
534
535 err = -ENOMEM;
536 a = kzalloc(sizeof(*a), GFP_KERNEL);
537 if (a == NULL)
538 goto err_mod;
539
540 a->ops = a_o;
541 INIT_LIST_HEAD(&a->list);
542 /* backward compatibility for policer */
543 if (name == NULL)
544 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
545 else
546 err = a_o->init(net, nla, est, a, ovr, bind);
547 if (err < 0)
548 goto err_free;
549
550 /* module count goes up only when brand new policy is created
551 * if it exists and is only bound to in a_o->init() then
552 * ACT_P_CREATED is not returned (a zero is).
553 */
554 if (err != ACT_P_CREATED)
555 module_put(a_o->owner);
556
557 return a;
558
559err_free:
560 kfree(a);
561err_mod:
562 module_put(a_o->owner);
563err_out:
564 return ERR_PTR(err);
565}
566
567int tcf_action_init(struct net *net, struct nlattr *nla,
568 struct nlattr *est, char *name, int ovr,
569 int bind, struct list_head *actions)
570{
571 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
572 struct tc_action *act;
573 int err;
574 int i;
575
576 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
577 if (err < 0)
578 return err;
579
580 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
581 act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
582 if (IS_ERR(act)) {
583 err = PTR_ERR(act);
584 goto err;
585 }
586 act->order = i;
587 list_add_tail(&act->list, actions);
588 }
589 return 0;
590
591err:
592 tcf_action_destroy(actions, bind);
593 return err;
594}
595
596int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
597 int compat_mode)
598{
599 int err = 0;
600 struct gnet_dump d;
601 struct tcf_common *p = a->priv;
602
603 if (p == NULL)
604 goto errout;
605
606 /* compat_mode being true specifies a call that is supposed
607 * to add additional backward compatibility statistic TLVs.
608 */
609 if (compat_mode) {
610 if (a->type == TCA_OLD_COMPAT)
611 err = gnet_stats_start_copy_compat(skb, 0,
612 TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d);
613 else
614 return 0;
615 } else
616 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
617 &p->tcfc_lock, &d);
618
619 if (err < 0)
620 goto errout;
621
622 if (gnet_stats_copy_basic(&d, &p->tcfc_bstats) < 0 ||
623 gnet_stats_copy_rate_est(&d, &p->tcfc_bstats,
624 &p->tcfc_rate_est) < 0 ||
625 gnet_stats_copy_queue(&d, &p->tcfc_qstats) < 0)
626 goto errout;
627
628 if (gnet_stats_finish_copy(&d) < 0)
629 goto errout;
630
631 return 0;
632
633errout:
634 return -1;
635}
636
637static int
638tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq,
639 u16 flags, int event, int bind, int ref)
640{
641 struct tcamsg *t;
642 struct nlmsghdr *nlh;
643 unsigned char *b = skb_tail_pointer(skb);
644 struct nlattr *nest;
645
646 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
647 if (!nlh)
648 goto out_nlmsg_trim;
649 t = nlmsg_data(nlh);
650 t->tca_family = AF_UNSPEC;
651 t->tca__pad1 = 0;
652 t->tca__pad2 = 0;
653
654 nest = nla_nest_start(skb, TCA_ACT_TAB);
655 if (nest == NULL)
656 goto out_nlmsg_trim;
657
658 if (tcf_action_dump(skb, actions, bind, ref) < 0)
659 goto out_nlmsg_trim;
660
661 nla_nest_end(skb, nest);
662
663 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
664 return skb->len;
665
666out_nlmsg_trim:
667 nlmsg_trim(skb, b);
668 return -1;
669}
670
671static int
672act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
673 struct list_head *actions, int event)
674{
675 struct sk_buff *skb;
676
677 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
678 if (!skb)
679 return -ENOBUFS;
680 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
681 kfree_skb(skb);
682 return -EINVAL;
683 }
684
685 return rtnl_unicast(skb, net, portid);
686}
687
688static struct tc_action *create_a(int i)
689{
690 struct tc_action *act;
691
692 act = kzalloc(sizeof(*act), GFP_KERNEL);
693 if (act == NULL) {
694 pr_debug("create_a: failed to alloc!\n");
695 return NULL;
696 }
697 act->order = i;
698 INIT_LIST_HEAD(&act->list);
699 return act;
700}
701
702static struct tc_action *
703tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid)
704{
705 struct nlattr *tb[TCA_ACT_MAX + 1];
706 struct tc_action *a;
707 int index;
708 int err;
709
710 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
711 if (err < 0)
712 goto err_out;
713
714 err = -EINVAL;
715 if (tb[TCA_ACT_INDEX] == NULL ||
716 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
717 goto err_out;
718 index = nla_get_u32(tb[TCA_ACT_INDEX]);
719
720 err = -ENOMEM;
721 a = create_a(0);
722 if (a == NULL)
723 goto err_out;
724
725 err = -EINVAL;
726 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
727 if (a->ops == NULL) /* could happen in batch of actions */
728 goto err_free;
729 err = -ENOENT;
730 if (a->ops->lookup(a, index) == 0)
731 goto err_mod;
732
733 module_put(a->ops->owner);
734 return a;
735
736err_mod:
737 module_put(a->ops->owner);
738err_free:
739 kfree(a);
740err_out:
741 return ERR_PTR(err);
742}
743
744static void cleanup_a(struct list_head *actions)
745{
746 struct tc_action *a, *tmp;
747
748 list_for_each_entry_safe(a, tmp, actions, list) {
749 list_del(&a->list);
750 kfree(a);
751 }
752}
753
754static int tca_action_flush(struct net *net, struct nlattr *nla,
755 struct nlmsghdr *n, u32 portid)
756{
757 struct sk_buff *skb;
758 unsigned char *b;
759 struct nlmsghdr *nlh;
760 struct tcamsg *t;
761 struct netlink_callback dcb;
762 struct nlattr *nest;
763 struct nlattr *tb[TCA_ACT_MAX + 1];
764 struct nlattr *kind;
765 struct tc_action a;
766 int err = -ENOMEM;
767
768 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
769 if (!skb) {
770 pr_debug("tca_action_flush: failed skb alloc\n");
771 return err;
772 }
773
774 b = skb_tail_pointer(skb);
775
776 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
777 if (err < 0)
778 goto err_out;
779
780 err = -EINVAL;
781 kind = tb[TCA_ACT_KIND];
782 memset(&a, 0, sizeof(struct tc_action));
783 INIT_LIST_HEAD(&a.list);
784 a.ops = tc_lookup_action(kind);
785 if (a.ops == NULL) /*some idjot trying to flush unknown action */
786 goto err_out;
787
788 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0);
789 if (!nlh)
790 goto out_module_put;
791 t = nlmsg_data(nlh);
792 t->tca_family = AF_UNSPEC;
793 t->tca__pad1 = 0;
794 t->tca__pad2 = 0;
795
796 nest = nla_nest_start(skb, TCA_ACT_TAB);
797 if (nest == NULL)
798 goto out_module_put;
799
800 err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a);
801 if (err < 0)
802 goto out_module_put;
803 if (err == 0)
804 goto noflush_out;
805
806 nla_nest_end(skb, nest);
807
808 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
809 nlh->nlmsg_flags |= NLM_F_ROOT;
810 module_put(a.ops->owner);
811 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
812 n->nlmsg_flags & NLM_F_ECHO);
813 if (err > 0)
814 return 0;
815
816 return err;
817
818out_module_put:
819 module_put(a.ops->owner);
820err_out:
821noflush_out:
822 kfree_skb(skb);
823 return err;
824}
825
826static int
827tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
828 u32 portid)
829{
830 int ret;
831 struct sk_buff *skb;
832
833 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
834 if (!skb)
835 return -ENOBUFS;
836
837 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
838 0, 1) <= 0) {
839 kfree_skb(skb);
840 return -EINVAL;
841 }
842
843 /* now do the delete */
844 ret = tcf_action_destroy(actions, 0);
845 if (ret < 0) {
846 kfree_skb(skb);
847 return ret;
848 }
849
850 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
851 n->nlmsg_flags & NLM_F_ECHO);
852 if (ret > 0)
853 return 0;
854 return ret;
855}
856
857static int
858tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
859 u32 portid, int event)
860{
861 int i, ret;
862 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
863 struct tc_action *act;
864 LIST_HEAD(actions);
865
866 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
867 if (ret < 0)
868 return ret;
869
870 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
871 if (tb[1] != NULL)
872 return tca_action_flush(net, tb[1], n, portid);
873 else
874 return -EINVAL;
875 }
876
877 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
878 act = tcf_action_get_1(tb[i], n, portid);
879 if (IS_ERR(act)) {
880 ret = PTR_ERR(act);
881 goto err;
882 }
883 act->order = i;
884 list_add_tail(&act->list, &actions);
885 }
886
887 if (event == RTM_GETACTION)
888 ret = act_get_notify(net, portid, n, &actions, event);
889 else { /* delete */
890 ret = tcf_del_notify(net, n, &actions, portid);
891 if (ret)
892 goto err;
893 return ret;
894 }
895err:
896 cleanup_a(&actions);
897 return ret;
898}
899
900static int
901tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
902 u32 portid)
903{
904 struct sk_buff *skb;
905 int err = 0;
906
907 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
908 if (!skb)
909 return -ENOBUFS;
910
911 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
912 RTM_NEWACTION, 0, 0) <= 0) {
913 kfree_skb(skb);
914 return -EINVAL;
915 }
916
917 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
918 n->nlmsg_flags & NLM_F_ECHO);
919 if (err > 0)
920 err = 0;
921 return err;
922}
923
924static int
925tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
926 u32 portid, int ovr)
927{
928 int ret = 0;
929 LIST_HEAD(actions);
930
931 ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions);
932 if (ret)
933 goto done;
934
935 /* dump then free all the actions after update; inserted policy
936 * stays intact
937 */
938 ret = tcf_add_notify(net, n, &actions, portid);
939 cleanup_a(&actions);
940done:
941 return ret;
942}
943
944static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
945{
946 struct net *net = sock_net(skb->sk);
947 struct nlattr *tca[TCA_ACT_MAX + 1];
948 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
949 int ret = 0, ovr = 0;
950
951 if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN))
952 return -EPERM;
953
954 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
955 if (ret < 0)
956 return ret;
957
958 if (tca[TCA_ACT_TAB] == NULL) {
959 pr_notice("tc_ctl_action: received NO action attribs\n");
960 return -EINVAL;
961 }
962
963 /* n->nlmsg_flags & NLM_F_CREATE */
964 switch (n->nlmsg_type) {
965 case RTM_NEWACTION:
966 /* we are going to assume all other flags
967 * imply create only if it doesn't exist
968 * Note that CREATE | EXCL implies that
969 * but since we want avoid ambiguity (eg when flags
970 * is zero) then just set this
971 */
972 if (n->nlmsg_flags & NLM_F_REPLACE)
973 ovr = 1;
974replay:
975 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
976 if (ret == -EAGAIN)
977 goto replay;
978 break;
979 case RTM_DELACTION:
980 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
981 portid, RTM_DELACTION);
982 break;
983 case RTM_GETACTION:
984 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
985 portid, RTM_GETACTION);
986 break;
987 default:
988 BUG();
989 }
990
991 return ret;
992}
993
994static struct nlattr *
995find_dump_kind(const struct nlmsghdr *n)
996{
997 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
998 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
999 struct nlattr *nla[TCAA_MAX + 1];
1000 struct nlattr *kind;
1001
1002 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1003 return NULL;
1004 tb1 = nla[TCA_ACT_TAB];
1005 if (tb1 == NULL)
1006 return NULL;
1007
1008 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1009 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1010 return NULL;
1011
1012 if (tb[1] == NULL)
1013 return NULL;
1014 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1015 nla_len(tb[1]), NULL) < 0)
1016 return NULL;
1017 kind = tb2[TCA_ACT_KIND];
1018
1019 return kind;
1020}
1021
1022static int
1023tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1024{
1025 struct nlmsghdr *nlh;
1026 unsigned char *b = skb_tail_pointer(skb);
1027 struct nlattr *nest;
1028 struct tc_action_ops *a_o;
1029 struct tc_action a;
1030 int ret = 0;
1031 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1032 struct nlattr *kind = find_dump_kind(cb->nlh);
1033
1034 if (kind == NULL) {
1035 pr_info("tc_dump_action: action bad kind\n");
1036 return 0;
1037 }
1038
1039 a_o = tc_lookup_action(kind);
1040 if (a_o == NULL)
1041 return 0;
1042
1043 memset(&a, 0, sizeof(struct tc_action));
1044 a.ops = a_o;
1045
1046 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1047 cb->nlh->nlmsg_type, sizeof(*t), 0);
1048 if (!nlh)
1049 goto out_module_put;
1050 t = nlmsg_data(nlh);
1051 t->tca_family = AF_UNSPEC;
1052 t->tca__pad1 = 0;
1053 t->tca__pad2 = 0;
1054
1055 nest = nla_nest_start(skb, TCA_ACT_TAB);
1056 if (nest == NULL)
1057 goto out_module_put;
1058
1059 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1060 if (ret < 0)
1061 goto out_module_put;
1062
1063 if (ret > 0) {
1064 nla_nest_end(skb, nest);
1065 ret = skb->len;
1066 } else
1067 nla_nest_cancel(skb, nest);
1068
1069 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1070 if (NETLINK_CB(cb->skb).portid && ret)
1071 nlh->nlmsg_flags |= NLM_F_MULTI;
1072 module_put(a_o->owner);
1073 return skb->len;
1074
1075out_module_put:
1076 module_put(a_o->owner);
1077 nlmsg_trim(skb, b);
1078 return skb->len;
1079}
1080
1081static int __init tc_action_init(void)
1082{
1083 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1084 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1085 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1086 NULL);
1087
1088 return 0;
1089}
1090
1091subsys_initcall(tc_action_init);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_api.c Packet action API.
4 *
5 * Author: Jamal Hadi Salim
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/string.h>
11#include <linux/errno.h>
12#include <linux/slab.h>
13#include <linux/skbuff.h>
14#include <linux/init.h>
15#include <linux/kmod.h>
16#include <linux/err.h>
17#include <linux/module.h>
18#include <net/net_namespace.h>
19#include <net/sock.h>
20#include <net/sch_generic.h>
21#include <net/pkt_cls.h>
22#include <net/tc_act/tc_pedit.h>
23#include <net/act_api.h>
24#include <net/netlink.h>
25#include <net/flow_offload.h>
26#include <net/tc_wrapper.h>
27
28#ifdef CONFIG_INET
29DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
30EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
31#endif
32
33int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
34{
35#ifdef CONFIG_INET
36 if (static_branch_unlikely(&tcf_frag_xmit_count))
37 return sch_frag_xmit_hook(skb, xmit);
38#endif
39
40 return xmit(skb);
41}
42EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
43
44static void tcf_action_goto_chain_exec(const struct tc_action *a,
45 struct tcf_result *res)
46{
47 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
48
49 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
50}
51
52static void tcf_free_cookie_rcu(struct rcu_head *p)
53{
54 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
55
56 kfree(cookie->data);
57 kfree(cookie);
58}
59
60static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
61 struct tc_cookie *new_cookie)
62{
63 struct tc_cookie *old;
64
65 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
66 if (old)
67 call_rcu(&old->rcu, tcf_free_cookie_rcu);
68}
69
70int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
71 struct tcf_chain **newchain,
72 struct netlink_ext_ack *extack)
73{
74 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
75 u32 chain_index;
76
77 if (!opcode)
78 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
79 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
80 ret = 0;
81 if (ret) {
82 NL_SET_ERR_MSG(extack, "invalid control action");
83 goto end;
84 }
85
86 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
87 chain_index = action & TC_ACT_EXT_VAL_MASK;
88 if (!tp || !newchain) {
89 ret = -EINVAL;
90 NL_SET_ERR_MSG(extack,
91 "can't goto NULL proto/chain");
92 goto end;
93 }
94 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
95 if (!*newchain) {
96 ret = -ENOMEM;
97 NL_SET_ERR_MSG(extack,
98 "can't allocate goto_chain");
99 }
100 }
101end:
102 return ret;
103}
104EXPORT_SYMBOL(tcf_action_check_ctrlact);
105
106struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
107 struct tcf_chain *goto_chain)
108{
109 a->tcfa_action = action;
110 goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
111 return goto_chain;
112}
113EXPORT_SYMBOL(tcf_action_set_ctrlact);
114
115/* XXX: For standalone actions, we don't need a RCU grace period either, because
116 * actions are always connected to filters and filters are already destroyed in
117 * RCU callbacks, so after a RCU grace period actions are already disconnected
118 * from filters. Readers later can not find us.
119 */
120static void free_tcf(struct tc_action *p)
121{
122 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
123
124 free_percpu(p->cpu_bstats);
125 free_percpu(p->cpu_bstats_hw);
126 free_percpu(p->cpu_qstats);
127
128 tcf_set_action_cookie(&p->user_cookie, NULL);
129 if (chain)
130 tcf_chain_put_by_act(chain);
131
132 kfree(p);
133}
134
135static void offload_action_hw_count_set(struct tc_action *act,
136 u32 hw_count)
137{
138 act->in_hw_count = hw_count;
139}
140
141static void offload_action_hw_count_inc(struct tc_action *act,
142 u32 hw_count)
143{
144 act->in_hw_count += hw_count;
145}
146
147static void offload_action_hw_count_dec(struct tc_action *act,
148 u32 hw_count)
149{
150 act->in_hw_count = act->in_hw_count > hw_count ?
151 act->in_hw_count - hw_count : 0;
152}
153
154static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
155{
156 if (is_tcf_pedit(act))
157 return tcf_pedit_nkeys(act);
158 else
159 return 1;
160}
161
162static bool tc_act_skip_hw(u32 flags)
163{
164 return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
165}
166
167static bool tc_act_skip_sw(u32 flags)
168{
169 return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
170}
171
172/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
173static bool tc_act_flags_valid(u32 flags)
174{
175 flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
176
177 return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
178}
179
180static int offload_action_init(struct flow_offload_action *fl_action,
181 struct tc_action *act,
182 enum offload_act_command cmd,
183 struct netlink_ext_ack *extack)
184{
185 int err;
186
187 fl_action->extack = extack;
188 fl_action->command = cmd;
189 fl_action->index = act->tcfa_index;
190 fl_action->cookie = (unsigned long)act;
191
192 if (act->ops->offload_act_setup) {
193 spin_lock_bh(&act->tcfa_lock);
194 err = act->ops->offload_act_setup(act, fl_action, NULL,
195 false, extack);
196 spin_unlock_bh(&act->tcfa_lock);
197 return err;
198 }
199
200 return -EOPNOTSUPP;
201}
202
203static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
204 u32 *hw_count)
205{
206 int err;
207
208 err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
209 fl_act, NULL, NULL);
210 if (err < 0)
211 return err;
212
213 if (hw_count)
214 *hw_count = err;
215
216 return 0;
217}
218
219static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
220 u32 *hw_count,
221 flow_indr_block_bind_cb_t *cb,
222 void *cb_priv)
223{
224 int err;
225
226 err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
227 if (err < 0)
228 return err;
229
230 if (hw_count)
231 *hw_count = 1;
232
233 return 0;
234}
235
236static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
237 u32 *hw_count,
238 flow_indr_block_bind_cb_t *cb,
239 void *cb_priv)
240{
241 return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
242 cb, cb_priv) :
243 tcf_action_offload_cmd_ex(fl_act, hw_count);
244}
245
246static int tcf_action_offload_add_ex(struct tc_action *action,
247 struct netlink_ext_ack *extack,
248 flow_indr_block_bind_cb_t *cb,
249 void *cb_priv)
250{
251 bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
252 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
253 [0] = action,
254 };
255 struct flow_offload_action *fl_action;
256 u32 in_hw_count = 0;
257 int num, err = 0;
258
259 if (tc_act_skip_hw(action->tcfa_flags))
260 return 0;
261
262 num = tcf_offload_act_num_actions_single(action);
263 fl_action = offload_action_alloc(num);
264 if (!fl_action)
265 return -ENOMEM;
266
267 err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
268 if (err)
269 goto fl_err;
270
271 err = tc_setup_action(&fl_action->action, actions, 0, extack);
272 if (err) {
273 NL_SET_ERR_MSG_MOD(extack,
274 "Failed to setup tc actions for offload");
275 goto fl_err;
276 }
277
278 err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
279 if (!err)
280 cb ? offload_action_hw_count_inc(action, in_hw_count) :
281 offload_action_hw_count_set(action, in_hw_count);
282
283 if (skip_sw && !tc_act_in_hw(action))
284 err = -EINVAL;
285
286 tc_cleanup_offload_action(&fl_action->action);
287
288fl_err:
289 kfree(fl_action);
290
291 return err;
292}
293
294/* offload the tc action after it is inserted */
295static int tcf_action_offload_add(struct tc_action *action,
296 struct netlink_ext_ack *extack)
297{
298 return tcf_action_offload_add_ex(action, extack, NULL, NULL);
299}
300
301int tcf_action_update_hw_stats(struct tc_action *action)
302{
303 struct flow_offload_action fl_act = {};
304 int err;
305
306 err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
307 if (err)
308 return err;
309
310 err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
311 if (!err) {
312 preempt_disable();
313 tcf_action_stats_update(action, fl_act.stats.bytes,
314 fl_act.stats.pkts,
315 fl_act.stats.drops,
316 fl_act.stats.lastused,
317 true);
318 preempt_enable();
319 action->used_hw_stats = fl_act.stats.used_hw_stats;
320 action->used_hw_stats_valid = true;
321 } else {
322 return -EOPNOTSUPP;
323 }
324
325 return 0;
326}
327EXPORT_SYMBOL(tcf_action_update_hw_stats);
328
329static int tcf_action_offload_del_ex(struct tc_action *action,
330 flow_indr_block_bind_cb_t *cb,
331 void *cb_priv)
332{
333 struct flow_offload_action fl_act = {};
334 u32 in_hw_count = 0;
335 int err = 0;
336
337 if (!tc_act_in_hw(action))
338 return 0;
339
340 err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
341 if (err)
342 return err;
343
344 err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
345 if (err < 0)
346 return err;
347
348 if (!cb && action->in_hw_count != in_hw_count)
349 return -EINVAL;
350
351 /* do not need to update hw state when deleting action */
352 if (cb && in_hw_count)
353 offload_action_hw_count_dec(action, in_hw_count);
354
355 return 0;
356}
357
358static int tcf_action_offload_del(struct tc_action *action)
359{
360 return tcf_action_offload_del_ex(action, NULL, NULL);
361}
362
363static void tcf_action_cleanup(struct tc_action *p)
364{
365 tcf_action_offload_del(p);
366 if (p->ops->cleanup)
367 p->ops->cleanup(p);
368
369 gen_kill_estimator(&p->tcfa_rate_est);
370 free_tcf(p);
371}
372
373static int __tcf_action_put(struct tc_action *p, bool bind)
374{
375 struct tcf_idrinfo *idrinfo = p->idrinfo;
376
377 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
378 if (bind)
379 atomic_dec(&p->tcfa_bindcnt);
380 idr_remove(&idrinfo->action_idr, p->tcfa_index);
381 mutex_unlock(&idrinfo->lock);
382
383 tcf_action_cleanup(p);
384 return 1;
385 }
386
387 if (bind)
388 atomic_dec(&p->tcfa_bindcnt);
389
390 return 0;
391}
392
393static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
394{
395 int ret = 0;
396
397 /* Release with strict==1 and bind==0 is only called through act API
398 * interface (classifiers always bind). Only case when action with
399 * positive reference count and zero bind count can exist is when it was
400 * also created with act API (unbinding last classifier will destroy the
401 * action if it was created by classifier). So only case when bind count
402 * can be changed after initial check is when unbound action is
403 * destroyed by act API while classifier binds to action with same id
404 * concurrently. This result either creation of new action(same behavior
405 * as before), or reusing existing action if concurrent process
406 * increments reference count before action is deleted. Both scenarios
407 * are acceptable.
408 */
409 if (p) {
410 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
411 return -EPERM;
412
413 if (__tcf_action_put(p, bind))
414 ret = ACT_P_DELETED;
415 }
416
417 return ret;
418}
419
420int tcf_idr_release(struct tc_action *a, bool bind)
421{
422 const struct tc_action_ops *ops = a->ops;
423 int ret;
424
425 ret = __tcf_idr_release(a, bind, false);
426 if (ret == ACT_P_DELETED)
427 module_put(ops->owner);
428 return ret;
429}
430EXPORT_SYMBOL(tcf_idr_release);
431
432static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
433{
434 struct tc_cookie *user_cookie;
435 u32 cookie_len = 0;
436
437 rcu_read_lock();
438 user_cookie = rcu_dereference(act->user_cookie);
439
440 if (user_cookie)
441 cookie_len = nla_total_size(user_cookie->len);
442 rcu_read_unlock();
443
444 return nla_total_size(0) /* action number nested */
445 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
446 + cookie_len /* TCA_ACT_COOKIE */
447 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
448 + nla_total_size(0) /* TCA_ACT_STATS nested */
449 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
450 /* TCA_STATS_BASIC */
451 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
452 /* TCA_STATS_PKT64 */
453 + nla_total_size_64bit(sizeof(u64))
454 /* TCA_STATS_QUEUE */
455 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
456 + nla_total_size(0) /* TCA_ACT_OPTIONS nested */
457 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
458}
459
460static size_t tcf_action_full_attrs_size(size_t sz)
461{
462 return NLMSG_HDRLEN /* struct nlmsghdr */
463 + sizeof(struct tcamsg)
464 + nla_total_size(0) /* TCA_ACT_TAB nested */
465 + sz;
466}
467
468static size_t tcf_action_fill_size(const struct tc_action *act)
469{
470 size_t sz = tcf_action_shared_attrs_size(act);
471
472 if (act->ops->get_fill_size)
473 return act->ops->get_fill_size(act) + sz;
474 return sz;
475}
476
477static int
478tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
479{
480 unsigned char *b = skb_tail_pointer(skb);
481 struct tc_cookie *cookie;
482
483 if (nla_put_string(skb, TCA_ACT_KIND, a->ops->kind))
484 goto nla_put_failure;
485 if (tcf_action_copy_stats(skb, a, 0))
486 goto nla_put_failure;
487 if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
488 goto nla_put_failure;
489
490 rcu_read_lock();
491 cookie = rcu_dereference(a->user_cookie);
492 if (cookie) {
493 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
494 rcu_read_unlock();
495 goto nla_put_failure;
496 }
497 }
498 rcu_read_unlock();
499
500 return 0;
501
502nla_put_failure:
503 nlmsg_trim(skb, b);
504 return -1;
505}
506
507static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
508 struct netlink_callback *cb)
509{
510 int err = 0, index = -1, s_i = 0, n_i = 0;
511 u32 act_flags = cb->args[2];
512 unsigned long jiffy_since = cb->args[3];
513 struct nlattr *nest;
514 struct idr *idr = &idrinfo->action_idr;
515 struct tc_action *p;
516 unsigned long id = 1;
517 unsigned long tmp;
518
519 mutex_lock(&idrinfo->lock);
520
521 s_i = cb->args[0];
522
523 idr_for_each_entry_ul(idr, p, tmp, id) {
524 index++;
525 if (index < s_i)
526 continue;
527 if (IS_ERR(p))
528 continue;
529
530 if (jiffy_since &&
531 time_after(jiffy_since,
532 (unsigned long)p->tcfa_tm.lastuse))
533 continue;
534
535 tcf_action_update_hw_stats(p);
536
537 nest = nla_nest_start_noflag(skb, n_i);
538 if (!nest) {
539 index--;
540 goto nla_put_failure;
541 }
542 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
543 tcf_action_dump_terse(skb, p, true) :
544 tcf_action_dump_1(skb, p, 0, 0);
545 if (err < 0) {
546 index--;
547 nlmsg_trim(skb, nest);
548 goto done;
549 }
550 nla_nest_end(skb, nest);
551 n_i++;
552 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
553 n_i >= TCA_ACT_MAX_PRIO)
554 goto done;
555 }
556done:
557 if (index >= 0)
558 cb->args[0] = index + 1;
559
560 mutex_unlock(&idrinfo->lock);
561 if (n_i) {
562 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
563 cb->args[1] = n_i;
564 }
565 return n_i;
566
567nla_put_failure:
568 nla_nest_cancel(skb, nest);
569 goto done;
570}
571
572static int tcf_idr_release_unsafe(struct tc_action *p)
573{
574 if (atomic_read(&p->tcfa_bindcnt) > 0)
575 return -EPERM;
576
577 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
578 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
579 tcf_action_cleanup(p);
580 return ACT_P_DELETED;
581 }
582
583 return 0;
584}
585
586static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
587 const struct tc_action_ops *ops,
588 struct netlink_ext_ack *extack)
589{
590 struct nlattr *nest;
591 int n_i = 0;
592 int ret = -EINVAL;
593 struct idr *idr = &idrinfo->action_idr;
594 struct tc_action *p;
595 unsigned long id = 1;
596 unsigned long tmp;
597
598 nest = nla_nest_start_noflag(skb, 0);
599 if (nest == NULL)
600 goto nla_put_failure;
601 if (nla_put_string(skb, TCA_ACT_KIND, ops->kind))
602 goto nla_put_failure;
603
604 ret = 0;
605 mutex_lock(&idrinfo->lock);
606 idr_for_each_entry_ul(idr, p, tmp, id) {
607 if (IS_ERR(p))
608 continue;
609 ret = tcf_idr_release_unsafe(p);
610 if (ret == ACT_P_DELETED)
611 module_put(ops->owner);
612 else if (ret < 0)
613 break;
614 n_i++;
615 }
616 mutex_unlock(&idrinfo->lock);
617 if (ret < 0) {
618 if (n_i)
619 NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
620 else
621 goto nla_put_failure;
622 }
623
624 ret = nla_put_u32(skb, TCA_FCNT, n_i);
625 if (ret)
626 goto nla_put_failure;
627 nla_nest_end(skb, nest);
628
629 return n_i;
630nla_put_failure:
631 nla_nest_cancel(skb, nest);
632 return ret;
633}
634
635int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
636 struct netlink_callback *cb, int type,
637 const struct tc_action_ops *ops,
638 struct netlink_ext_ack *extack)
639{
640 struct tcf_idrinfo *idrinfo = tn->idrinfo;
641
642 if (type == RTM_DELACTION) {
643 return tcf_del_walker(idrinfo, skb, ops, extack);
644 } else if (type == RTM_GETACTION) {
645 return tcf_dump_walker(idrinfo, skb, cb);
646 } else {
647 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
648 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
649 return -EINVAL;
650 }
651}
652EXPORT_SYMBOL(tcf_generic_walker);
653
654int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
655{
656 struct tcf_idrinfo *idrinfo = tn->idrinfo;
657 struct tc_action *p;
658
659 mutex_lock(&idrinfo->lock);
660 p = idr_find(&idrinfo->action_idr, index);
661 if (IS_ERR(p))
662 p = NULL;
663 else if (p)
664 refcount_inc(&p->tcfa_refcnt);
665 mutex_unlock(&idrinfo->lock);
666
667 if (p) {
668 *a = p;
669 return true;
670 }
671 return false;
672}
673EXPORT_SYMBOL(tcf_idr_search);
674
675static int __tcf_generic_walker(struct net *net, struct sk_buff *skb,
676 struct netlink_callback *cb, int type,
677 const struct tc_action_ops *ops,
678 struct netlink_ext_ack *extack)
679{
680 struct tc_action_net *tn = net_generic(net, ops->net_id);
681
682 if (unlikely(ops->walk))
683 return ops->walk(net, skb, cb, type, ops, extack);
684
685 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
686}
687
688static int __tcf_idr_search(struct net *net,
689 const struct tc_action_ops *ops,
690 struct tc_action **a, u32 index)
691{
692 struct tc_action_net *tn = net_generic(net, ops->net_id);
693
694 if (unlikely(ops->lookup))
695 return ops->lookup(net, a, index);
696
697 return tcf_idr_search(tn, a, index);
698}
699
700static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
701{
702 struct tc_action *p;
703 int ret = 0;
704
705 mutex_lock(&idrinfo->lock);
706 p = idr_find(&idrinfo->action_idr, index);
707 if (!p) {
708 mutex_unlock(&idrinfo->lock);
709 return -ENOENT;
710 }
711
712 if (!atomic_read(&p->tcfa_bindcnt)) {
713 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
714 struct module *owner = p->ops->owner;
715
716 WARN_ON(p != idr_remove(&idrinfo->action_idr,
717 p->tcfa_index));
718 mutex_unlock(&idrinfo->lock);
719
720 tcf_action_cleanup(p);
721 module_put(owner);
722 return 0;
723 }
724 ret = 0;
725 } else {
726 ret = -EPERM;
727 }
728
729 mutex_unlock(&idrinfo->lock);
730 return ret;
731}
732
733int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
734 struct tc_action **a, const struct tc_action_ops *ops,
735 int bind, bool cpustats, u32 flags)
736{
737 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
738 struct tcf_idrinfo *idrinfo = tn->idrinfo;
739 int err = -ENOMEM;
740
741 if (unlikely(!p))
742 return -ENOMEM;
743 refcount_set(&p->tcfa_refcnt, 1);
744 if (bind)
745 atomic_set(&p->tcfa_bindcnt, 1);
746
747 if (cpustats) {
748 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
749 if (!p->cpu_bstats)
750 goto err1;
751 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
752 if (!p->cpu_bstats_hw)
753 goto err2;
754 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
755 if (!p->cpu_qstats)
756 goto err3;
757 }
758 gnet_stats_basic_sync_init(&p->tcfa_bstats);
759 gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
760 spin_lock_init(&p->tcfa_lock);
761 p->tcfa_index = index;
762 p->tcfa_tm.install = jiffies;
763 p->tcfa_tm.lastuse = jiffies;
764 p->tcfa_tm.firstuse = 0;
765 p->tcfa_flags = flags;
766 if (est) {
767 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
768 &p->tcfa_rate_est,
769 &p->tcfa_lock, false, est);
770 if (err)
771 goto err4;
772 }
773
774 p->idrinfo = idrinfo;
775 __module_get(ops->owner);
776 p->ops = ops;
777 *a = p;
778 return 0;
779err4:
780 free_percpu(p->cpu_qstats);
781err3:
782 free_percpu(p->cpu_bstats_hw);
783err2:
784 free_percpu(p->cpu_bstats);
785err1:
786 kfree(p);
787 return err;
788}
789EXPORT_SYMBOL(tcf_idr_create);
790
791int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
792 struct nlattr *est, struct tc_action **a,
793 const struct tc_action_ops *ops, int bind,
794 u32 flags)
795{
796 /* Set cpustats according to actions flags. */
797 return tcf_idr_create(tn, index, est, a, ops, bind,
798 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
799}
800EXPORT_SYMBOL(tcf_idr_create_from_flags);
801
802/* Cleanup idr index that was allocated but not initialized. */
803
804void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
805{
806 struct tcf_idrinfo *idrinfo = tn->idrinfo;
807
808 mutex_lock(&idrinfo->lock);
809 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
810 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
811 mutex_unlock(&idrinfo->lock);
812}
813EXPORT_SYMBOL(tcf_idr_cleanup);
814
815/* Check if action with specified index exists. If actions is found, increments
816 * its reference and bind counters, and return 1. Otherwise insert temporary
817 * error pointer (to prevent concurrent users from inserting actions with same
818 * index) and return 0.
819 *
820 * May return -EAGAIN for binding actions in case of a parallel add/delete on
821 * the requested index.
822 */
823
824int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
825 struct tc_action **a, int bind)
826{
827 struct tcf_idrinfo *idrinfo = tn->idrinfo;
828 struct tc_action *p;
829 int ret;
830 u32 max;
831
832 if (*index) {
833again:
834 rcu_read_lock();
835 p = idr_find(&idrinfo->action_idr, *index);
836
837 if (IS_ERR(p)) {
838 /* This means that another process allocated
839 * index but did not assign the pointer yet.
840 */
841 rcu_read_unlock();
842 goto again;
843 }
844
845 if (!p) {
846 /* Empty slot, try to allocate it */
847 max = *index;
848 rcu_read_unlock();
849 goto new;
850 }
851
852 if (!refcount_inc_not_zero(&p->tcfa_refcnt)) {
853 /* Action was deleted in parallel */
854 rcu_read_unlock();
855 return -EAGAIN;
856 }
857
858 if (bind)
859 atomic_inc(&p->tcfa_bindcnt);
860 *a = p;
861
862 rcu_read_unlock();
863
864 return 1;
865 } else {
866 /* Find a slot */
867 *index = 1;
868 max = UINT_MAX;
869 }
870
871new:
872 *a = NULL;
873
874 mutex_lock(&idrinfo->lock);
875 ret = idr_alloc_u32(&idrinfo->action_idr, ERR_PTR(-EBUSY), index, max,
876 GFP_KERNEL);
877 mutex_unlock(&idrinfo->lock);
878
879 /* N binds raced for action allocation,
880 * retry for all the ones that failed.
881 */
882 if (ret == -ENOSPC && *index == max)
883 ret = -EAGAIN;
884
885 return ret;
886}
887EXPORT_SYMBOL(tcf_idr_check_alloc);
888
889void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
890 struct tcf_idrinfo *idrinfo)
891{
892 struct idr *idr = &idrinfo->action_idr;
893 struct tc_action *p;
894 int ret;
895 unsigned long id = 1;
896 unsigned long tmp;
897
898 idr_for_each_entry_ul(idr, p, tmp, id) {
899 ret = __tcf_idr_release(p, false, true);
900 if (ret == ACT_P_DELETED)
901 module_put(ops->owner);
902 else if (ret < 0)
903 return;
904 }
905 idr_destroy(&idrinfo->action_idr);
906}
907EXPORT_SYMBOL(tcf_idrinfo_destroy);
908
909static LIST_HEAD(act_base);
910static DEFINE_RWLOCK(act_mod_lock);
911/* since act ops id is stored in pernet subsystem list,
912 * then there is no way to walk through only all the action
913 * subsystem, so we keep tc action pernet ops id for
914 * reoffload to walk through.
915 */
916static LIST_HEAD(act_pernet_id_list);
917static DEFINE_MUTEX(act_id_mutex);
918struct tc_act_pernet_id {
919 struct list_head list;
920 unsigned int id;
921};
922
923static int tcf_pernet_add_id_list(unsigned int id)
924{
925 struct tc_act_pernet_id *id_ptr;
926 int ret = 0;
927
928 mutex_lock(&act_id_mutex);
929 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
930 if (id_ptr->id == id) {
931 ret = -EEXIST;
932 goto err_out;
933 }
934 }
935
936 id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
937 if (!id_ptr) {
938 ret = -ENOMEM;
939 goto err_out;
940 }
941 id_ptr->id = id;
942
943 list_add_tail(&id_ptr->list, &act_pernet_id_list);
944
945err_out:
946 mutex_unlock(&act_id_mutex);
947 return ret;
948}
949
950static void tcf_pernet_del_id_list(unsigned int id)
951{
952 struct tc_act_pernet_id *id_ptr;
953
954 mutex_lock(&act_id_mutex);
955 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
956 if (id_ptr->id == id) {
957 list_del(&id_ptr->list);
958 kfree(id_ptr);
959 break;
960 }
961 }
962 mutex_unlock(&act_id_mutex);
963}
964
965int tcf_register_action(struct tc_action_ops *act,
966 struct pernet_operations *ops)
967{
968 struct tc_action_ops *a;
969 int ret;
970
971 if (!act->act || !act->dump || !act->init)
972 return -EINVAL;
973
974 /* We have to register pernet ops before making the action ops visible,
975 * otherwise tcf_action_init_1() could get a partially initialized
976 * netns.
977 */
978 ret = register_pernet_subsys(ops);
979 if (ret)
980 return ret;
981
982 if (ops->id) {
983 ret = tcf_pernet_add_id_list(*ops->id);
984 if (ret)
985 goto err_id;
986 }
987
988 write_lock(&act_mod_lock);
989 list_for_each_entry(a, &act_base, head) {
990 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
991 ret = -EEXIST;
992 goto err_out;
993 }
994 }
995 list_add_tail(&act->head, &act_base);
996 write_unlock(&act_mod_lock);
997
998 return 0;
999
1000err_out:
1001 write_unlock(&act_mod_lock);
1002 if (ops->id)
1003 tcf_pernet_del_id_list(*ops->id);
1004err_id:
1005 unregister_pernet_subsys(ops);
1006 return ret;
1007}
1008EXPORT_SYMBOL(tcf_register_action);
1009
1010int tcf_unregister_action(struct tc_action_ops *act,
1011 struct pernet_operations *ops)
1012{
1013 struct tc_action_ops *a;
1014 int err = -ENOENT;
1015
1016 write_lock(&act_mod_lock);
1017 list_for_each_entry(a, &act_base, head) {
1018 if (a == act) {
1019 list_del(&act->head);
1020 err = 0;
1021 break;
1022 }
1023 }
1024 write_unlock(&act_mod_lock);
1025 if (!err) {
1026 unregister_pernet_subsys(ops);
1027 if (ops->id)
1028 tcf_pernet_del_id_list(*ops->id);
1029 }
1030 return err;
1031}
1032EXPORT_SYMBOL(tcf_unregister_action);
1033
1034/* lookup by name */
1035static struct tc_action_ops *tc_lookup_action_n(char *kind)
1036{
1037 struct tc_action_ops *a, *res = NULL;
1038
1039 if (kind) {
1040 read_lock(&act_mod_lock);
1041 list_for_each_entry(a, &act_base, head) {
1042 if (strcmp(kind, a->kind) == 0) {
1043 if (try_module_get(a->owner))
1044 res = a;
1045 break;
1046 }
1047 }
1048 read_unlock(&act_mod_lock);
1049 }
1050 return res;
1051}
1052
1053/* lookup by nlattr */
1054static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1055{
1056 struct tc_action_ops *a, *res = NULL;
1057
1058 if (kind) {
1059 read_lock(&act_mod_lock);
1060 list_for_each_entry(a, &act_base, head) {
1061 if (nla_strcmp(kind, a->kind) == 0) {
1062 if (try_module_get(a->owner))
1063 res = a;
1064 break;
1065 }
1066 }
1067 read_unlock(&act_mod_lock);
1068 }
1069 return res;
1070}
1071
1072/*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1073#define TCA_ACT_MAX_PRIO_MASK 0x1FF
1074int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1075 int nr_actions, struct tcf_result *res)
1076{
1077 u32 jmp_prgcnt = 0;
1078 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1079 int i;
1080 int ret = TC_ACT_OK;
1081
1082 if (skb_skip_tc_classify(skb))
1083 return TC_ACT_OK;
1084
1085restart_act_graph:
1086 for (i = 0; i < nr_actions; i++) {
1087 const struct tc_action *a = actions[i];
1088 int repeat_ttl;
1089
1090 if (jmp_prgcnt > 0) {
1091 jmp_prgcnt -= 1;
1092 continue;
1093 }
1094
1095 if (tc_act_skip_sw(a->tcfa_flags))
1096 continue;
1097
1098 repeat_ttl = 32;
1099repeat:
1100 ret = tc_act(skb, a, res);
1101 if (unlikely(ret == TC_ACT_REPEAT)) {
1102 if (--repeat_ttl != 0)
1103 goto repeat;
1104 /* suspicious opcode, stop pipeline */
1105 net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1106 return TC_ACT_OK;
1107 }
1108 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1109 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1110 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1111 /* faulty opcode, stop pipeline */
1112 return TC_ACT_OK;
1113 } else {
1114 jmp_ttl -= 1;
1115 if (jmp_ttl > 0)
1116 goto restart_act_graph;
1117 else /* faulty graph, stop pipeline */
1118 return TC_ACT_OK;
1119 }
1120 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1121 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1122 tcf_set_drop_reason(skb,
1123 SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
1124 return TC_ACT_SHOT;
1125 }
1126 tcf_action_goto_chain_exec(a, res);
1127 }
1128
1129 if (ret != TC_ACT_PIPE)
1130 break;
1131 }
1132
1133 return ret;
1134}
1135EXPORT_SYMBOL(tcf_action_exec);
1136
1137int tcf_action_destroy(struct tc_action *actions[], int bind)
1138{
1139 const struct tc_action_ops *ops;
1140 struct tc_action *a;
1141 int ret = 0, i;
1142
1143 tcf_act_for_each_action(i, a, actions) {
1144 actions[i] = NULL;
1145 ops = a->ops;
1146 ret = __tcf_idr_release(a, bind, true);
1147 if (ret == ACT_P_DELETED)
1148 module_put(ops->owner);
1149 else if (ret < 0)
1150 return ret;
1151 }
1152 return ret;
1153}
1154
1155static int tcf_action_put(struct tc_action *p)
1156{
1157 return __tcf_action_put(p, false);
1158}
1159
1160static void tcf_action_put_many(struct tc_action *actions[])
1161{
1162 struct tc_action *a;
1163 int i;
1164
1165 tcf_act_for_each_action(i, a, actions) {
1166 const struct tc_action_ops *ops = a->ops;
1167 if (tcf_action_put(a))
1168 module_put(ops->owner);
1169 }
1170}
1171
1172static void tca_put_bound_many(struct tc_action *actions[], int init_res[])
1173{
1174 struct tc_action *a;
1175 int i;
1176
1177 tcf_act_for_each_action(i, a, actions) {
1178 const struct tc_action_ops *ops = a->ops;
1179
1180 if (init_res[i] == ACT_P_CREATED)
1181 continue;
1182
1183 if (tcf_action_put(a))
1184 module_put(ops->owner);
1185 }
1186}
1187
1188int
1189tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1190{
1191 return a->ops->dump(skb, a, bind, ref);
1192}
1193
1194int
1195tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1196{
1197 int err = -EINVAL;
1198 unsigned char *b = skb_tail_pointer(skb);
1199 struct nlattr *nest;
1200 u32 flags;
1201
1202 if (tcf_action_dump_terse(skb, a, false))
1203 goto nla_put_failure;
1204
1205 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
1206 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
1207 a->hw_stats, TCA_ACT_HW_STATS_ANY))
1208 goto nla_put_failure;
1209
1210 if (a->used_hw_stats_valid &&
1211 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
1212 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
1213 goto nla_put_failure;
1214
1215 flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
1216 if (flags &&
1217 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
1218 flags, flags))
1219 goto nla_put_failure;
1220
1221 if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
1222 goto nla_put_failure;
1223
1224 nest = nla_nest_start_noflag(skb, TCA_ACT_OPTIONS);
1225 if (nest == NULL)
1226 goto nla_put_failure;
1227 err = tcf_action_dump_old(skb, a, bind, ref);
1228 if (err > 0) {
1229 nla_nest_end(skb, nest);
1230 return err;
1231 }
1232
1233nla_put_failure:
1234 nlmsg_trim(skb, b);
1235 return -1;
1236}
1237EXPORT_SYMBOL(tcf_action_dump_1);
1238
1239int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1240 int bind, int ref, bool terse)
1241{
1242 struct tc_action *a;
1243 int err = -EINVAL, i;
1244 struct nlattr *nest;
1245
1246 tcf_act_for_each_action(i, a, actions) {
1247 nest = nla_nest_start_noflag(skb, i + 1);
1248 if (nest == NULL)
1249 goto nla_put_failure;
1250 err = terse ? tcf_action_dump_terse(skb, a, false) :
1251 tcf_action_dump_1(skb, a, bind, ref);
1252 if (err < 0)
1253 goto errout;
1254 nla_nest_end(skb, nest);
1255 }
1256
1257 return 0;
1258
1259nla_put_failure:
1260 err = -EINVAL;
1261errout:
1262 nla_nest_cancel(skb, nest);
1263 return err;
1264}
1265
1266static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1267{
1268 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1269 if (!c)
1270 return NULL;
1271
1272 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1273 if (!c->data) {
1274 kfree(c);
1275 return NULL;
1276 }
1277 c->len = nla_len(tb[TCA_ACT_COOKIE]);
1278
1279 return c;
1280}
1281
1282static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1283{
1284 struct nla_bitfield32 hw_stats_bf;
1285
1286 /* If the user did not pass the attr, that means he does
1287 * not care about the type. Return "any" in that case
1288 * which is setting on all supported types.
1289 */
1290 if (!hw_stats_attr)
1291 return TCA_ACT_HW_STATS_ANY;
1292 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
1293 return hw_stats_bf.value;
1294}
1295
1296static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1297 [TCA_ACT_KIND] = { .type = NLA_STRING },
1298 [TCA_ACT_INDEX] = { .type = NLA_U32 },
1299 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
1300 .len = TC_COOKIE_MAX_SIZE },
1301 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
1302 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1303 TCA_ACT_FLAGS_SKIP_HW |
1304 TCA_ACT_FLAGS_SKIP_SW),
1305 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1306};
1307
1308void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
1309{
1310 struct tc_action *a;
1311 int i;
1312
1313 tcf_act_for_each_action(i, a, actions) {
1314 struct tcf_idrinfo *idrinfo;
1315
1316 if (init_res[i] == ACT_P_BOUND)
1317 continue;
1318
1319 idrinfo = a->idrinfo;
1320 mutex_lock(&idrinfo->lock);
1321 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
1322 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1323 mutex_unlock(&idrinfo->lock);
1324 }
1325}
1326
1327struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
1328 struct netlink_ext_ack *extack)
1329{
1330 bool police = flags & TCA_ACT_FLAGS_POLICE;
1331 struct nlattr *tb[TCA_ACT_MAX + 1];
1332 struct tc_action_ops *a_o;
1333 char act_name[IFNAMSIZ];
1334 struct nlattr *kind;
1335 int err;
1336
1337 if (!police) {
1338 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1339 tcf_action_policy, extack);
1340 if (err < 0)
1341 return ERR_PTR(err);
1342 err = -EINVAL;
1343 kind = tb[TCA_ACT_KIND];
1344 if (!kind) {
1345 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1346 return ERR_PTR(err);
1347 }
1348 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
1349 NL_SET_ERR_MSG(extack, "TC action name too long");
1350 return ERR_PTR(err);
1351 }
1352 } else {
1353 if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
1354 NL_SET_ERR_MSG(extack, "TC action name too long");
1355 return ERR_PTR(-EINVAL);
1356 }
1357 }
1358
1359 a_o = tc_lookup_action_n(act_name);
1360 if (a_o == NULL) {
1361#ifdef CONFIG_MODULES
1362 bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL);
1363
1364 if (rtnl_held)
1365 rtnl_unlock();
1366 request_module("act_%s", act_name);
1367 if (rtnl_held)
1368 rtnl_lock();
1369
1370 a_o = tc_lookup_action_n(act_name);
1371
1372 /* We dropped the RTNL semaphore in order to
1373 * perform the module load. So, even if we
1374 * succeeded in loading the module we have to
1375 * tell the caller to replay the request. We
1376 * indicate this using -EAGAIN.
1377 */
1378 if (a_o != NULL) {
1379 module_put(a_o->owner);
1380 return ERR_PTR(-EAGAIN);
1381 }
1382#endif
1383 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1384 return ERR_PTR(-ENOENT);
1385 }
1386
1387 return a_o;
1388}
1389
1390struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1391 struct nlattr *nla, struct nlattr *est,
1392 struct tc_action_ops *a_o, int *init_res,
1393 u32 flags, struct netlink_ext_ack *extack)
1394{
1395 bool police = flags & TCA_ACT_FLAGS_POLICE;
1396 struct nla_bitfield32 userflags = { 0, 0 };
1397 struct tc_cookie *user_cookie = NULL;
1398 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1399 struct nlattr *tb[TCA_ACT_MAX + 1];
1400 struct tc_action *a;
1401 int err;
1402
1403 /* backward compatibility for policer */
1404 if (!police) {
1405 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1406 tcf_action_policy, extack);
1407 if (err < 0)
1408 return ERR_PTR(err);
1409 if (tb[TCA_ACT_COOKIE]) {
1410 user_cookie = nla_memdup_cookie(tb);
1411 if (!user_cookie) {
1412 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1413 err = -ENOMEM;
1414 goto err_out;
1415 }
1416 }
1417 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1418 if (tb[TCA_ACT_FLAGS]) {
1419 userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1420 if (!tc_act_flags_valid(userflags.value)) {
1421 err = -EINVAL;
1422 goto err_out;
1423 }
1424 }
1425
1426 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1427 userflags.value | flags, extack);
1428 } else {
1429 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1430 extack);
1431 }
1432 if (err < 0)
1433 goto err_out;
1434 *init_res = err;
1435
1436 if (!police && tb[TCA_ACT_COOKIE])
1437 tcf_set_action_cookie(&a->user_cookie, user_cookie);
1438
1439 if (!police)
1440 a->hw_stats = hw_stats;
1441
1442 return a;
1443
1444err_out:
1445 if (user_cookie) {
1446 kfree(user_cookie->data);
1447 kfree(user_cookie);
1448 }
1449 return ERR_PTR(err);
1450}
1451
1452static bool tc_act_bind(u32 flags)
1453{
1454 return !!(flags & TCA_ACT_FLAGS_BIND);
1455}
1456
1457/* Returns numbers of initialized actions or negative error. */
1458
1459int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1460 struct nlattr *est, struct tc_action *actions[],
1461 int init_res[], size_t *attr_size,
1462 u32 flags, u32 fl_flags,
1463 struct netlink_ext_ack *extack)
1464{
1465 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1466 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1467 struct tc_action *act;
1468 size_t sz = 0;
1469 int err;
1470 int i;
1471
1472 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1473 extack);
1474 if (err < 0)
1475 return err;
1476
1477 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1478 struct tc_action_ops *a_o;
1479
1480 a_o = tc_action_load_ops(tb[i], flags, extack);
1481 if (IS_ERR(a_o)) {
1482 err = PTR_ERR(a_o);
1483 goto err_mod;
1484 }
1485 ops[i - 1] = a_o;
1486 }
1487
1488 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1489 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1490 &init_res[i - 1], flags, extack);
1491 if (IS_ERR(act)) {
1492 err = PTR_ERR(act);
1493 goto err;
1494 }
1495 sz += tcf_action_fill_size(act);
1496 /* Start from index 0 */
1497 actions[i - 1] = act;
1498 if (tc_act_bind(flags)) {
1499 bool skip_sw = tc_skip_sw(fl_flags);
1500 bool skip_hw = tc_skip_hw(fl_flags);
1501
1502 if (tc_act_bind(act->tcfa_flags))
1503 continue;
1504 if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1505 skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
1506 NL_SET_ERR_MSG(extack,
1507 "Mismatch between action and filter offload flags");
1508 err = -EINVAL;
1509 goto err;
1510 }
1511 } else {
1512 err = tcf_action_offload_add(act, extack);
1513 if (tc_act_skip_sw(act->tcfa_flags) && err)
1514 goto err;
1515 }
1516 }
1517
1518 /* We have to commit them all together, because if any error happened in
1519 * between, we could not handle the failure gracefully.
1520 */
1521 tcf_idr_insert_many(actions, init_res);
1522
1523 *attr_size = tcf_action_full_attrs_size(sz);
1524 err = i - 1;
1525 goto err_mod;
1526
1527err:
1528 tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
1529err_mod:
1530 for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++)
1531 module_put(ops[i]->owner);
1532 return err;
1533}
1534
1535void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1536 u64 drops, bool hw)
1537{
1538 if (a->cpu_bstats) {
1539 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1540
1541 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1542
1543 if (hw)
1544 _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1545 bytes, packets);
1546 return;
1547 }
1548
1549 _bstats_update(&a->tcfa_bstats, bytes, packets);
1550 a->tcfa_qstats.drops += drops;
1551 if (hw)
1552 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1553}
1554EXPORT_SYMBOL(tcf_action_update_stats);
1555
1556int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1557 int compat_mode)
1558{
1559 int err = 0;
1560 struct gnet_dump d;
1561
1562 if (p == NULL)
1563 goto errout;
1564
1565 /* compat_mode being true specifies a call that is supposed
1566 * to add additional backward compatibility statistic TLVs.
1567 */
1568 if (compat_mode) {
1569 if (p->type == TCA_OLD_COMPAT)
1570 err = gnet_stats_start_copy_compat(skb, 0,
1571 TCA_STATS,
1572 TCA_XSTATS,
1573 &p->tcfa_lock, &d,
1574 TCA_PAD);
1575 else
1576 return 0;
1577 } else
1578 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1579 &p->tcfa_lock, &d, TCA_ACT_PAD);
1580
1581 if (err < 0)
1582 goto errout;
1583
1584 if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1585 &p->tcfa_bstats, false) < 0 ||
1586 gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1587 &p->tcfa_bstats_hw, false) < 0 ||
1588 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1589 gnet_stats_copy_queue(&d, p->cpu_qstats,
1590 &p->tcfa_qstats,
1591 p->tcfa_qstats.qlen) < 0)
1592 goto errout;
1593
1594 if (gnet_stats_finish_copy(&d) < 0)
1595 goto errout;
1596
1597 return 0;
1598
1599errout:
1600 return -1;
1601}
1602
1603static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1604 u32 portid, u32 seq, u16 flags, int event, int bind,
1605 int ref, struct netlink_ext_ack *extack)
1606{
1607 struct tcamsg *t;
1608 struct nlmsghdr *nlh;
1609 unsigned char *b = skb_tail_pointer(skb);
1610 struct nlattr *nest;
1611
1612 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1613 if (!nlh)
1614 goto out_nlmsg_trim;
1615 t = nlmsg_data(nlh);
1616 t->tca_family = AF_UNSPEC;
1617 t->tca__pad1 = 0;
1618 t->tca__pad2 = 0;
1619
1620 if (extack && extack->_msg &&
1621 nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg))
1622 goto out_nlmsg_trim;
1623
1624 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1625 if (!nest)
1626 goto out_nlmsg_trim;
1627
1628 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1629 goto out_nlmsg_trim;
1630
1631 nla_nest_end(skb, nest);
1632
1633 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1634
1635 return skb->len;
1636
1637out_nlmsg_trim:
1638 nlmsg_trim(skb, b);
1639 return -1;
1640}
1641
1642static int
1643tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1644 struct tc_action *actions[], int event,
1645 struct netlink_ext_ack *extack)
1646{
1647 struct sk_buff *skb;
1648
1649 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1650 if (!skb)
1651 return -ENOBUFS;
1652 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1653 0, 1, NULL) <= 0) {
1654 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1655 kfree_skb(skb);
1656 return -EINVAL;
1657 }
1658
1659 return rtnl_unicast(skb, net, portid);
1660}
1661
1662static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1663 struct nlmsghdr *n, u32 portid,
1664 struct netlink_ext_ack *extack)
1665{
1666 struct nlattr *tb[TCA_ACT_MAX + 1];
1667 const struct tc_action_ops *ops;
1668 struct tc_action *a;
1669 int index;
1670 int err;
1671
1672 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1673 tcf_action_policy, extack);
1674 if (err < 0)
1675 goto err_out;
1676
1677 err = -EINVAL;
1678 if (tb[TCA_ACT_INDEX] == NULL ||
1679 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1680 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1681 goto err_out;
1682 }
1683 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1684
1685 err = -EINVAL;
1686 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1687 if (!ops) { /* could happen in batch of actions */
1688 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1689 goto err_out;
1690 }
1691 err = -ENOENT;
1692 if (__tcf_idr_search(net, ops, &a, index) == 0) {
1693 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1694 goto err_mod;
1695 }
1696
1697 module_put(ops->owner);
1698 return a;
1699
1700err_mod:
1701 module_put(ops->owner);
1702err_out:
1703 return ERR_PTR(err);
1704}
1705
1706static int tca_action_flush(struct net *net, struct nlattr *nla,
1707 struct nlmsghdr *n, u32 portid,
1708 struct netlink_ext_ack *extack)
1709{
1710 struct sk_buff *skb;
1711 unsigned char *b;
1712 struct nlmsghdr *nlh;
1713 struct tcamsg *t;
1714 struct netlink_callback dcb;
1715 struct nlattr *nest;
1716 struct nlattr *tb[TCA_ACT_MAX + 1];
1717 const struct tc_action_ops *ops;
1718 struct nlattr *kind;
1719 int err = -ENOMEM;
1720
1721 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1722 if (!skb)
1723 return err;
1724
1725 b = skb_tail_pointer(skb);
1726
1727 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1728 tcf_action_policy, extack);
1729 if (err < 0)
1730 goto err_out;
1731
1732 err = -EINVAL;
1733 kind = tb[TCA_ACT_KIND];
1734 ops = tc_lookup_action(kind);
1735 if (!ops) { /*some idjot trying to flush unknown action */
1736 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1737 goto err_out;
1738 }
1739
1740 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1741 sizeof(*t), 0);
1742 if (!nlh) {
1743 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1744 goto out_module_put;
1745 }
1746 t = nlmsg_data(nlh);
1747 t->tca_family = AF_UNSPEC;
1748 t->tca__pad1 = 0;
1749 t->tca__pad2 = 0;
1750
1751 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1752 if (!nest) {
1753 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1754 goto out_module_put;
1755 }
1756
1757 err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack);
1758 if (err <= 0) {
1759 nla_nest_cancel(skb, nest);
1760 goto out_module_put;
1761 }
1762
1763 nla_nest_end(skb, nest);
1764
1765 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1766 nlh->nlmsg_flags |= NLM_F_ROOT;
1767 module_put(ops->owner);
1768 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1769 n->nlmsg_flags & NLM_F_ECHO);
1770 if (err < 0)
1771 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1772
1773 return err;
1774
1775out_module_put:
1776 module_put(ops->owner);
1777err_out:
1778 kfree_skb(skb);
1779 return err;
1780}
1781
1782static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1783{
1784 struct tc_action *a;
1785 int i;
1786
1787 tcf_act_for_each_action(i, a, actions) {
1788 const struct tc_action_ops *ops = a->ops;
1789 /* Actions can be deleted concurrently so we must save their
1790 * type and id to search again after reference is released.
1791 */
1792 struct tcf_idrinfo *idrinfo = a->idrinfo;
1793 u32 act_index = a->tcfa_index;
1794
1795 actions[i] = NULL;
1796 if (tcf_action_put(a)) {
1797 /* last reference, action was deleted concurrently */
1798 module_put(ops->owner);
1799 } else {
1800 int ret;
1801
1802 /* now do the delete */
1803 ret = tcf_idr_delete_index(idrinfo, act_index);
1804 if (ret < 0)
1805 return ret;
1806 }
1807 }
1808 return 0;
1809}
1810
1811static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net,
1812 struct tc_action *action)
1813{
1814 size_t attr_size = tcf_action_fill_size(action);
1815 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1816 [0] = action,
1817 };
1818 struct sk_buff *skb;
1819
1820 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1821 if (!skb)
1822 return ERR_PTR(-ENOBUFS);
1823
1824 if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) {
1825 kfree_skb(skb);
1826 return ERR_PTR(-EINVAL);
1827 }
1828
1829 return skb;
1830}
1831
1832static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1833{
1834 const struct tc_action_ops *ops = action->ops;
1835 struct sk_buff *skb;
1836 int ret;
1837
1838 if (!rtnl_notify_needed(net, 0, RTNLGRP_TC)) {
1839 skb = NULL;
1840 } else {
1841 skb = tcf_reoffload_del_notify_msg(net, action);
1842 if (IS_ERR(skb))
1843 return PTR_ERR(skb);
1844 }
1845
1846 ret = tcf_idr_release_unsafe(action);
1847 if (ret == ACT_P_DELETED) {
1848 module_put(ops->owner);
1849 ret = rtnetlink_maybe_send(skb, net, 0, RTNLGRP_TC, 0);
1850 } else {
1851 kfree_skb(skb);
1852 }
1853
1854 return ret;
1855}
1856
1857int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1858 void *cb_priv, bool add)
1859{
1860 struct tc_act_pernet_id *id_ptr;
1861 struct tcf_idrinfo *idrinfo;
1862 struct tc_action_net *tn;
1863 struct tc_action *p;
1864 unsigned int act_id;
1865 unsigned long tmp;
1866 unsigned long id;
1867 struct idr *idr;
1868 struct net *net;
1869 int ret;
1870
1871 if (!cb)
1872 return -EINVAL;
1873
1874 down_read(&net_rwsem);
1875 mutex_lock(&act_id_mutex);
1876
1877 for_each_net(net) {
1878 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1879 act_id = id_ptr->id;
1880 tn = net_generic(net, act_id);
1881 if (!tn)
1882 continue;
1883 idrinfo = tn->idrinfo;
1884 if (!idrinfo)
1885 continue;
1886
1887 mutex_lock(&idrinfo->lock);
1888 idr = &idrinfo->action_idr;
1889 idr_for_each_entry_ul(idr, p, tmp, id) {
1890 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1891 continue;
1892 if (add) {
1893 tcf_action_offload_add_ex(p, NULL, cb,
1894 cb_priv);
1895 continue;
1896 }
1897
1898 /* cb unregister to update hw count */
1899 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1900 if (ret < 0)
1901 continue;
1902 if (tc_act_skip_sw(p->tcfa_flags) &&
1903 !tc_act_in_hw(p))
1904 tcf_reoffload_del_notify(net, p);
1905 }
1906 mutex_unlock(&idrinfo->lock);
1907 }
1908 }
1909 mutex_unlock(&act_id_mutex);
1910 up_read(&net_rwsem);
1911
1912 return 0;
1913}
1914
1915static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n,
1916 struct tc_action *actions[],
1917 u32 portid, size_t attr_size,
1918 struct netlink_ext_ack *extack)
1919{
1920 struct sk_buff *skb;
1921
1922 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1923 if (!skb)
1924 return ERR_PTR(-ENOBUFS);
1925
1926 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1927 0, 2, extack) <= 0) {
1928 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1929 kfree_skb(skb);
1930 return ERR_PTR(-EINVAL);
1931 }
1932
1933 return skb;
1934}
1935
1936static int tcf_del_notify(struct net *net, struct nlmsghdr *n,
1937 struct tc_action *actions[], u32 portid,
1938 size_t attr_size, struct netlink_ext_ack *extack)
1939{
1940 struct sk_buff *skb;
1941 int ret;
1942
1943 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
1944 skb = NULL;
1945 } else {
1946 skb = tcf_del_notify_msg(net, n, actions, portid, attr_size,
1947 extack);
1948 if (IS_ERR(skb))
1949 return PTR_ERR(skb);
1950 }
1951
1952 /* now do the delete */
1953 ret = tcf_action_delete(net, actions);
1954 if (ret < 0) {
1955 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1956 kfree_skb(skb);
1957 return ret;
1958 }
1959
1960 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
1961 n->nlmsg_flags & NLM_F_ECHO);
1962}
1963
1964static int
1965tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1966 u32 portid, int event, struct netlink_ext_ack *extack)
1967{
1968 int i, ret;
1969 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1970 struct tc_action *act;
1971 size_t attr_size = 0;
1972 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1973
1974 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1975 extack);
1976 if (ret < 0)
1977 return ret;
1978
1979 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1980 if (tb[1])
1981 return tca_action_flush(net, tb[1], n, portid, extack);
1982
1983 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1984 return -EINVAL;
1985 }
1986
1987 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1988 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1989 if (IS_ERR(act)) {
1990 ret = PTR_ERR(act);
1991 goto err;
1992 }
1993 attr_size += tcf_action_fill_size(act);
1994 actions[i - 1] = act;
1995 }
1996
1997 attr_size = tcf_action_full_attrs_size(attr_size);
1998
1999 if (event == RTM_GETACTION)
2000 ret = tcf_get_notify(net, portid, n, actions, event, extack);
2001 else { /* delete */
2002 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
2003 if (ret)
2004 goto err;
2005 return 0;
2006 }
2007err:
2008 tcf_action_put_many(actions);
2009 return ret;
2010}
2011
2012static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n,
2013 struct tc_action *actions[],
2014 u32 portid, size_t attr_size,
2015 struct netlink_ext_ack *extack)
2016{
2017 struct sk_buff *skb;
2018
2019 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
2020 if (!skb)
2021 return ERR_PTR(-ENOBUFS);
2022
2023 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
2024 RTM_NEWACTION, 0, 0, extack) <= 0) {
2025 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
2026 kfree_skb(skb);
2027 return ERR_PTR(-EINVAL);
2028 }
2029
2030 return skb;
2031}
2032
2033static int tcf_add_notify(struct net *net, struct nlmsghdr *n,
2034 struct tc_action *actions[], u32 portid,
2035 size_t attr_size, struct netlink_ext_ack *extack)
2036{
2037 struct sk_buff *skb;
2038
2039 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
2040 skb = NULL;
2041 } else {
2042 skb = tcf_add_notify_msg(net, n, actions, portid, attr_size,
2043 extack);
2044 if (IS_ERR(skb))
2045 return PTR_ERR(skb);
2046 }
2047
2048 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
2049 n->nlmsg_flags & NLM_F_ECHO);
2050}
2051
2052static int tcf_action_add(struct net *net, struct nlattr *nla,
2053 struct nlmsghdr *n, u32 portid, u32 flags,
2054 struct netlink_ext_ack *extack)
2055{
2056 size_t attr_size = 0;
2057 int loop, ret;
2058 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
2059 int init_res[TCA_ACT_MAX_PRIO] = {};
2060
2061 for (loop = 0; loop < 10; loop++) {
2062 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
2063 &attr_size, flags, 0, extack);
2064 if (ret != -EAGAIN)
2065 break;
2066 }
2067
2068 if (ret < 0)
2069 return ret;
2070
2071 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
2072
2073 /* only put bound actions */
2074 tca_put_bound_many(actions, init_res);
2075
2076 return ret;
2077}
2078
2079static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
2080 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2081 TCA_ACT_FLAG_TERSE_DUMP),
2082 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
2083};
2084
2085static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2086 struct netlink_ext_ack *extack)
2087{
2088 struct net *net = sock_net(skb->sk);
2089 struct nlattr *tca[TCA_ROOT_MAX + 1];
2090 u32 portid = NETLINK_CB(skb).portid;
2091 u32 flags = 0;
2092 int ret = 0;
2093
2094 if ((n->nlmsg_type != RTM_GETACTION) &&
2095 !netlink_capable(skb, CAP_NET_ADMIN))
2096 return -EPERM;
2097
2098 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
2099 TCA_ROOT_MAX, NULL, extack);
2100 if (ret < 0)
2101 return ret;
2102
2103 if (tca[TCA_ACT_TAB] == NULL) {
2104 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2105 return -EINVAL;
2106 }
2107
2108 /* n->nlmsg_flags & NLM_F_CREATE */
2109 switch (n->nlmsg_type) {
2110 case RTM_NEWACTION:
2111 /* we are going to assume all other flags
2112 * imply create only if it doesn't exist
2113 * Note that CREATE | EXCL implies that
2114 * but since we want avoid ambiguity (eg when flags
2115 * is zero) then just set this
2116 */
2117 if (n->nlmsg_flags & NLM_F_REPLACE)
2118 flags = TCA_ACT_FLAGS_REPLACE;
2119 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
2120 extack);
2121 break;
2122 case RTM_DELACTION:
2123 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2124 portid, RTM_DELACTION, extack);
2125 break;
2126 case RTM_GETACTION:
2127 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2128 portid, RTM_GETACTION, extack);
2129 break;
2130 default:
2131 BUG();
2132 }
2133
2134 return ret;
2135}
2136
2137static struct nlattr *find_dump_kind(struct nlattr **nla)
2138{
2139 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2140 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2141 struct nlattr *kind;
2142
2143 tb1 = nla[TCA_ACT_TAB];
2144 if (tb1 == NULL)
2145 return NULL;
2146
2147 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2148 return NULL;
2149
2150 if (tb[1] == NULL)
2151 return NULL;
2152 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
2153 return NULL;
2154 kind = tb2[TCA_ACT_KIND];
2155
2156 return kind;
2157}
2158
2159static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2160{
2161 struct net *net = sock_net(skb->sk);
2162 struct nlmsghdr *nlh;
2163 unsigned char *b = skb_tail_pointer(skb);
2164 struct nlattr *nest;
2165 struct tc_action_ops *a_o;
2166 int ret = 0;
2167 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
2168 struct nlattr *tb[TCA_ROOT_MAX + 1];
2169 struct nlattr *count_attr = NULL;
2170 unsigned long jiffy_since = 0;
2171 struct nlattr *kind = NULL;
2172 struct nla_bitfield32 bf;
2173 u32 msecs_since = 0;
2174 u32 act_count = 0;
2175
2176 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2177 TCA_ROOT_MAX, tcaa_policy, cb->extack);
2178 if (ret < 0)
2179 return ret;
2180
2181 kind = find_dump_kind(tb);
2182 if (kind == NULL) {
2183 pr_info("tc_dump_action: action bad kind\n");
2184 return 0;
2185 }
2186
2187 a_o = tc_lookup_action(kind);
2188 if (a_o == NULL)
2189 return 0;
2190
2191 cb->args[2] = 0;
2192 if (tb[TCA_ROOT_FLAGS]) {
2193 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2194 cb->args[2] = bf.value;
2195 }
2196
2197 if (tb[TCA_ROOT_TIME_DELTA]) {
2198 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2199 }
2200
2201 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2202 cb->nlh->nlmsg_type, sizeof(*t), 0);
2203 if (!nlh)
2204 goto out_module_put;
2205
2206 if (msecs_since)
2207 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2208
2209 t = nlmsg_data(nlh);
2210 t->tca_family = AF_UNSPEC;
2211 t->tca__pad1 = 0;
2212 t->tca__pad2 = 0;
2213 cb->args[3] = jiffy_since;
2214 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2215 if (!count_attr)
2216 goto out_module_put;
2217
2218 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2219 if (nest == NULL)
2220 goto out_module_put;
2221
2222 ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL);
2223 if (ret < 0)
2224 goto out_module_put;
2225
2226 if (ret > 0) {
2227 nla_nest_end(skb, nest);
2228 ret = skb->len;
2229 act_count = cb->args[1];
2230 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2231 cb->args[1] = 0;
2232 } else
2233 nlmsg_trim(skb, b);
2234
2235 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2236 if (NETLINK_CB(cb->skb).portid && ret)
2237 nlh->nlmsg_flags |= NLM_F_MULTI;
2238 module_put(a_o->owner);
2239 return skb->len;
2240
2241out_module_put:
2242 module_put(a_o->owner);
2243 nlmsg_trim(skb, b);
2244 return skb->len;
2245}
2246
2247static int __init tc_action_init(void)
2248{
2249 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
2250 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
2251 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
2252 0);
2253
2254 return 0;
2255}
2256
2257subsys_initcall(tc_action_init);