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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_api.c Packet action API.
4 *
5 * Author: Jamal Hadi Salim
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/string.h>
11#include <linux/errno.h>
12#include <linux/slab.h>
13#include <linux/skbuff.h>
14#include <linux/init.h>
15#include <linux/kmod.h>
16#include <linux/err.h>
17#include <linux/module.h>
18#include <net/net_namespace.h>
19#include <net/sock.h>
20#include <net/sch_generic.h>
21#include <net/pkt_cls.h>
22#include <net/act_api.h>
23#include <net/netlink.h>
24
25static void tcf_action_goto_chain_exec(const struct tc_action *a,
26 struct tcf_result *res)
27{
28 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
29
30 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
31}
32
33static void tcf_free_cookie_rcu(struct rcu_head *p)
34{
35 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
36
37 kfree(cookie->data);
38 kfree(cookie);
39}
40
41static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
42 struct tc_cookie *new_cookie)
43{
44 struct tc_cookie *old;
45
46 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
47 if (old)
48 call_rcu(&old->rcu, tcf_free_cookie_rcu);
49}
50
51int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
52 struct tcf_chain **newchain,
53 struct netlink_ext_ack *extack)
54{
55 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
56 u32 chain_index;
57
58 if (!opcode)
59 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
60 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
61 ret = 0;
62 if (ret) {
63 NL_SET_ERR_MSG(extack, "invalid control action");
64 goto end;
65 }
66
67 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
68 chain_index = action & TC_ACT_EXT_VAL_MASK;
69 if (!tp || !newchain) {
70 ret = -EINVAL;
71 NL_SET_ERR_MSG(extack,
72 "can't goto NULL proto/chain");
73 goto end;
74 }
75 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
76 if (!*newchain) {
77 ret = -ENOMEM;
78 NL_SET_ERR_MSG(extack,
79 "can't allocate goto_chain");
80 }
81 }
82end:
83 return ret;
84}
85EXPORT_SYMBOL(tcf_action_check_ctrlact);
86
87struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
88 struct tcf_chain *goto_chain)
89{
90 a->tcfa_action = action;
91 rcu_swap_protected(a->goto_chain, goto_chain, 1);
92 return goto_chain;
93}
94EXPORT_SYMBOL(tcf_action_set_ctrlact);
95
96/* XXX: For standalone actions, we don't need a RCU grace period either, because
97 * actions are always connected to filters and filters are already destroyed in
98 * RCU callbacks, so after a RCU grace period actions are already disconnected
99 * from filters. Readers later can not find us.
100 */
101static void free_tcf(struct tc_action *p)
102{
103 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
104
105 free_percpu(p->cpu_bstats);
106 free_percpu(p->cpu_bstats_hw);
107 free_percpu(p->cpu_qstats);
108
109 tcf_set_action_cookie(&p->act_cookie, NULL);
110 if (chain)
111 tcf_chain_put_by_act(chain);
112
113 kfree(p);
114}
115
116static void tcf_action_cleanup(struct tc_action *p)
117{
118 if (p->ops->cleanup)
119 p->ops->cleanup(p);
120
121 gen_kill_estimator(&p->tcfa_rate_est);
122 free_tcf(p);
123}
124
125static int __tcf_action_put(struct tc_action *p, bool bind)
126{
127 struct tcf_idrinfo *idrinfo = p->idrinfo;
128
129 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
130 if (bind)
131 atomic_dec(&p->tcfa_bindcnt);
132 idr_remove(&idrinfo->action_idr, p->tcfa_index);
133 mutex_unlock(&idrinfo->lock);
134
135 tcf_action_cleanup(p);
136 return 1;
137 }
138
139 if (bind)
140 atomic_dec(&p->tcfa_bindcnt);
141
142 return 0;
143}
144
145int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
146{
147 int ret = 0;
148
149 /* Release with strict==1 and bind==0 is only called through act API
150 * interface (classifiers always bind). Only case when action with
151 * positive reference count and zero bind count can exist is when it was
152 * also created with act API (unbinding last classifier will destroy the
153 * action if it was created by classifier). So only case when bind count
154 * can be changed after initial check is when unbound action is
155 * destroyed by act API while classifier binds to action with same id
156 * concurrently. This result either creation of new action(same behavior
157 * as before), or reusing existing action if concurrent process
158 * increments reference count before action is deleted. Both scenarios
159 * are acceptable.
160 */
161 if (p) {
162 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
163 return -EPERM;
164
165 if (__tcf_action_put(p, bind))
166 ret = ACT_P_DELETED;
167 }
168
169 return ret;
170}
171EXPORT_SYMBOL(__tcf_idr_release);
172
173static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
174{
175 struct tc_cookie *act_cookie;
176 u32 cookie_len = 0;
177
178 rcu_read_lock();
179 act_cookie = rcu_dereference(act->act_cookie);
180
181 if (act_cookie)
182 cookie_len = nla_total_size(act_cookie->len);
183 rcu_read_unlock();
184
185 return nla_total_size(0) /* action number nested */
186 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
187 + cookie_len /* TCA_ACT_COOKIE */
188 + nla_total_size(0) /* TCA_ACT_STATS nested */
189 /* TCA_STATS_BASIC */
190 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
191 /* TCA_STATS_QUEUE */
192 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
193 + nla_total_size(0) /* TCA_OPTIONS nested */
194 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
195}
196
197static size_t tcf_action_full_attrs_size(size_t sz)
198{
199 return NLMSG_HDRLEN /* struct nlmsghdr */
200 + sizeof(struct tcamsg)
201 + nla_total_size(0) /* TCA_ACT_TAB nested */
202 + sz;
203}
204
205static size_t tcf_action_fill_size(const struct tc_action *act)
206{
207 size_t sz = tcf_action_shared_attrs_size(act);
208
209 if (act->ops->get_fill_size)
210 return act->ops->get_fill_size(act) + sz;
211 return sz;
212}
213
214static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
215 struct netlink_callback *cb)
216{
217 int err = 0, index = -1, s_i = 0, n_i = 0;
218 u32 act_flags = cb->args[2];
219 unsigned long jiffy_since = cb->args[3];
220 struct nlattr *nest;
221 struct idr *idr = &idrinfo->action_idr;
222 struct tc_action *p;
223 unsigned long id = 1;
224 unsigned long tmp;
225
226 mutex_lock(&idrinfo->lock);
227
228 s_i = cb->args[0];
229
230 idr_for_each_entry_ul(idr, p, tmp, id) {
231 index++;
232 if (index < s_i)
233 continue;
234
235 if (jiffy_since &&
236 time_after(jiffy_since,
237 (unsigned long)p->tcfa_tm.lastuse))
238 continue;
239
240 nest = nla_nest_start_noflag(skb, n_i);
241 if (!nest) {
242 index--;
243 goto nla_put_failure;
244 }
245 err = tcf_action_dump_1(skb, p, 0, 0);
246 if (err < 0) {
247 index--;
248 nlmsg_trim(skb, nest);
249 goto done;
250 }
251 nla_nest_end(skb, nest);
252 n_i++;
253 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
254 n_i >= TCA_ACT_MAX_PRIO)
255 goto done;
256 }
257done:
258 if (index >= 0)
259 cb->args[0] = index + 1;
260
261 mutex_unlock(&idrinfo->lock);
262 if (n_i) {
263 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
264 cb->args[1] = n_i;
265 }
266 return n_i;
267
268nla_put_failure:
269 nla_nest_cancel(skb, nest);
270 goto done;
271}
272
273static int tcf_idr_release_unsafe(struct tc_action *p)
274{
275 if (atomic_read(&p->tcfa_bindcnt) > 0)
276 return -EPERM;
277
278 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
279 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
280 tcf_action_cleanup(p);
281 return ACT_P_DELETED;
282 }
283
284 return 0;
285}
286
287static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
288 const struct tc_action_ops *ops)
289{
290 struct nlattr *nest;
291 int n_i = 0;
292 int ret = -EINVAL;
293 struct idr *idr = &idrinfo->action_idr;
294 struct tc_action *p;
295 unsigned long id = 1;
296 unsigned long tmp;
297
298 nest = nla_nest_start_noflag(skb, 0);
299 if (nest == NULL)
300 goto nla_put_failure;
301 if (nla_put_string(skb, TCA_KIND, ops->kind))
302 goto nla_put_failure;
303
304 mutex_lock(&idrinfo->lock);
305 idr_for_each_entry_ul(idr, p, tmp, id) {
306 ret = tcf_idr_release_unsafe(p);
307 if (ret == ACT_P_DELETED) {
308 module_put(ops->owner);
309 n_i++;
310 } else if (ret < 0) {
311 mutex_unlock(&idrinfo->lock);
312 goto nla_put_failure;
313 }
314 }
315 mutex_unlock(&idrinfo->lock);
316
317 if (nla_put_u32(skb, TCA_FCNT, n_i))
318 goto nla_put_failure;
319 nla_nest_end(skb, nest);
320
321 return n_i;
322nla_put_failure:
323 nla_nest_cancel(skb, nest);
324 return ret;
325}
326
327int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
328 struct netlink_callback *cb, int type,
329 const struct tc_action_ops *ops,
330 struct netlink_ext_ack *extack)
331{
332 struct tcf_idrinfo *idrinfo = tn->idrinfo;
333
334 if (type == RTM_DELACTION) {
335 return tcf_del_walker(idrinfo, skb, ops);
336 } else if (type == RTM_GETACTION) {
337 return tcf_dump_walker(idrinfo, skb, cb);
338 } else {
339 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
340 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
341 return -EINVAL;
342 }
343}
344EXPORT_SYMBOL(tcf_generic_walker);
345
346int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
347{
348 struct tcf_idrinfo *idrinfo = tn->idrinfo;
349 struct tc_action *p;
350
351 mutex_lock(&idrinfo->lock);
352 p = idr_find(&idrinfo->action_idr, index);
353 if (IS_ERR(p))
354 p = NULL;
355 else if (p)
356 refcount_inc(&p->tcfa_refcnt);
357 mutex_unlock(&idrinfo->lock);
358
359 if (p) {
360 *a = p;
361 return true;
362 }
363 return false;
364}
365EXPORT_SYMBOL(tcf_idr_search);
366
367static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
368{
369 struct tc_action *p;
370 int ret = 0;
371
372 mutex_lock(&idrinfo->lock);
373 p = idr_find(&idrinfo->action_idr, index);
374 if (!p) {
375 mutex_unlock(&idrinfo->lock);
376 return -ENOENT;
377 }
378
379 if (!atomic_read(&p->tcfa_bindcnt)) {
380 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
381 struct module *owner = p->ops->owner;
382
383 WARN_ON(p != idr_remove(&idrinfo->action_idr,
384 p->tcfa_index));
385 mutex_unlock(&idrinfo->lock);
386
387 tcf_action_cleanup(p);
388 module_put(owner);
389 return 0;
390 }
391 ret = 0;
392 } else {
393 ret = -EPERM;
394 }
395
396 mutex_unlock(&idrinfo->lock);
397 return ret;
398}
399
400int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
401 struct tc_action **a, const struct tc_action_ops *ops,
402 int bind, bool cpustats)
403{
404 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
405 struct tcf_idrinfo *idrinfo = tn->idrinfo;
406 int err = -ENOMEM;
407
408 if (unlikely(!p))
409 return -ENOMEM;
410 refcount_set(&p->tcfa_refcnt, 1);
411 if (bind)
412 atomic_set(&p->tcfa_bindcnt, 1);
413
414 if (cpustats) {
415 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
416 if (!p->cpu_bstats)
417 goto err1;
418 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
419 if (!p->cpu_bstats_hw)
420 goto err2;
421 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
422 if (!p->cpu_qstats)
423 goto err3;
424 }
425 spin_lock_init(&p->tcfa_lock);
426 p->tcfa_index = index;
427 p->tcfa_tm.install = jiffies;
428 p->tcfa_tm.lastuse = jiffies;
429 p->tcfa_tm.firstuse = 0;
430 if (est) {
431 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
432 &p->tcfa_rate_est,
433 &p->tcfa_lock, NULL, est);
434 if (err)
435 goto err4;
436 }
437
438 p->idrinfo = idrinfo;
439 p->ops = ops;
440 *a = p;
441 return 0;
442err4:
443 free_percpu(p->cpu_qstats);
444err3:
445 free_percpu(p->cpu_bstats_hw);
446err2:
447 free_percpu(p->cpu_bstats);
448err1:
449 kfree(p);
450 return err;
451}
452EXPORT_SYMBOL(tcf_idr_create);
453
454void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
455{
456 struct tcf_idrinfo *idrinfo = tn->idrinfo;
457
458 mutex_lock(&idrinfo->lock);
459 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
460 WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index)));
461 mutex_unlock(&idrinfo->lock);
462}
463EXPORT_SYMBOL(tcf_idr_insert);
464
465/* Cleanup idr index that was allocated but not initialized. */
466
467void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
468{
469 struct tcf_idrinfo *idrinfo = tn->idrinfo;
470
471 mutex_lock(&idrinfo->lock);
472 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
473 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
474 mutex_unlock(&idrinfo->lock);
475}
476EXPORT_SYMBOL(tcf_idr_cleanup);
477
478/* Check if action with specified index exists. If actions is found, increments
479 * its reference and bind counters, and return 1. Otherwise insert temporary
480 * error pointer (to prevent concurrent users from inserting actions with same
481 * index) and return 0.
482 */
483
484int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
485 struct tc_action **a, int bind)
486{
487 struct tcf_idrinfo *idrinfo = tn->idrinfo;
488 struct tc_action *p;
489 int ret;
490
491again:
492 mutex_lock(&idrinfo->lock);
493 if (*index) {
494 p = idr_find(&idrinfo->action_idr, *index);
495 if (IS_ERR(p)) {
496 /* This means that another process allocated
497 * index but did not assign the pointer yet.
498 */
499 mutex_unlock(&idrinfo->lock);
500 goto again;
501 }
502
503 if (p) {
504 refcount_inc(&p->tcfa_refcnt);
505 if (bind)
506 atomic_inc(&p->tcfa_bindcnt);
507 *a = p;
508 ret = 1;
509 } else {
510 *a = NULL;
511 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
512 *index, GFP_KERNEL);
513 if (!ret)
514 idr_replace(&idrinfo->action_idr,
515 ERR_PTR(-EBUSY), *index);
516 }
517 } else {
518 *index = 1;
519 *a = NULL;
520 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
521 UINT_MAX, GFP_KERNEL);
522 if (!ret)
523 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
524 *index);
525 }
526 mutex_unlock(&idrinfo->lock);
527 return ret;
528}
529EXPORT_SYMBOL(tcf_idr_check_alloc);
530
531void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
532 struct tcf_idrinfo *idrinfo)
533{
534 struct idr *idr = &idrinfo->action_idr;
535 struct tc_action *p;
536 int ret;
537 unsigned long id = 1;
538 unsigned long tmp;
539
540 idr_for_each_entry_ul(idr, p, tmp, id) {
541 ret = __tcf_idr_release(p, false, true);
542 if (ret == ACT_P_DELETED)
543 module_put(ops->owner);
544 else if (ret < 0)
545 return;
546 }
547 idr_destroy(&idrinfo->action_idr);
548}
549EXPORT_SYMBOL(tcf_idrinfo_destroy);
550
551static LIST_HEAD(act_base);
552static DEFINE_RWLOCK(act_mod_lock);
553
554int tcf_register_action(struct tc_action_ops *act,
555 struct pernet_operations *ops)
556{
557 struct tc_action_ops *a;
558 int ret;
559
560 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
561 return -EINVAL;
562
563 /* We have to register pernet ops before making the action ops visible,
564 * otherwise tcf_action_init_1() could get a partially initialized
565 * netns.
566 */
567 ret = register_pernet_subsys(ops);
568 if (ret)
569 return ret;
570
571 write_lock(&act_mod_lock);
572 list_for_each_entry(a, &act_base, head) {
573 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
574 write_unlock(&act_mod_lock);
575 unregister_pernet_subsys(ops);
576 return -EEXIST;
577 }
578 }
579 list_add_tail(&act->head, &act_base);
580 write_unlock(&act_mod_lock);
581
582 return 0;
583}
584EXPORT_SYMBOL(tcf_register_action);
585
586int tcf_unregister_action(struct tc_action_ops *act,
587 struct pernet_operations *ops)
588{
589 struct tc_action_ops *a;
590 int err = -ENOENT;
591
592 write_lock(&act_mod_lock);
593 list_for_each_entry(a, &act_base, head) {
594 if (a == act) {
595 list_del(&act->head);
596 err = 0;
597 break;
598 }
599 }
600 write_unlock(&act_mod_lock);
601 if (!err)
602 unregister_pernet_subsys(ops);
603 return err;
604}
605EXPORT_SYMBOL(tcf_unregister_action);
606
607/* lookup by name */
608static struct tc_action_ops *tc_lookup_action_n(char *kind)
609{
610 struct tc_action_ops *a, *res = NULL;
611
612 if (kind) {
613 read_lock(&act_mod_lock);
614 list_for_each_entry(a, &act_base, head) {
615 if (strcmp(kind, a->kind) == 0) {
616 if (try_module_get(a->owner))
617 res = a;
618 break;
619 }
620 }
621 read_unlock(&act_mod_lock);
622 }
623 return res;
624}
625
626/* lookup by nlattr */
627static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
628{
629 struct tc_action_ops *a, *res = NULL;
630
631 if (kind) {
632 read_lock(&act_mod_lock);
633 list_for_each_entry(a, &act_base, head) {
634 if (nla_strcmp(kind, a->kind) == 0) {
635 if (try_module_get(a->owner))
636 res = a;
637 break;
638 }
639 }
640 read_unlock(&act_mod_lock);
641 }
642 return res;
643}
644
645/*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
646#define TCA_ACT_MAX_PRIO_MASK 0x1FF
647int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
648 int nr_actions, struct tcf_result *res)
649{
650 u32 jmp_prgcnt = 0;
651 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
652 int i;
653 int ret = TC_ACT_OK;
654
655 if (skb_skip_tc_classify(skb))
656 return TC_ACT_OK;
657
658restart_act_graph:
659 for (i = 0; i < nr_actions; i++) {
660 const struct tc_action *a = actions[i];
661
662 if (jmp_prgcnt > 0) {
663 jmp_prgcnt -= 1;
664 continue;
665 }
666repeat:
667 ret = a->ops->act(skb, a, res);
668 if (ret == TC_ACT_REPEAT)
669 goto repeat; /* we need a ttl - JHS */
670
671 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
672 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
673 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
674 /* faulty opcode, stop pipeline */
675 return TC_ACT_OK;
676 } else {
677 jmp_ttl -= 1;
678 if (jmp_ttl > 0)
679 goto restart_act_graph;
680 else /* faulty graph, stop pipeline */
681 return TC_ACT_OK;
682 }
683 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
684 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
685 net_warn_ratelimited("can't go to NULL chain!\n");
686 return TC_ACT_SHOT;
687 }
688 tcf_action_goto_chain_exec(a, res);
689 }
690
691 if (ret != TC_ACT_PIPE)
692 break;
693 }
694
695 return ret;
696}
697EXPORT_SYMBOL(tcf_action_exec);
698
699int tcf_action_destroy(struct tc_action *actions[], int bind)
700{
701 const struct tc_action_ops *ops;
702 struct tc_action *a;
703 int ret = 0, i;
704
705 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
706 a = actions[i];
707 actions[i] = NULL;
708 ops = a->ops;
709 ret = __tcf_idr_release(a, bind, true);
710 if (ret == ACT_P_DELETED)
711 module_put(ops->owner);
712 else if (ret < 0)
713 return ret;
714 }
715 return ret;
716}
717
718static int tcf_action_destroy_1(struct tc_action *a, int bind)
719{
720 struct tc_action *actions[] = { a, NULL };
721
722 return tcf_action_destroy(actions, bind);
723}
724
725static int tcf_action_put(struct tc_action *p)
726{
727 return __tcf_action_put(p, false);
728}
729
730/* Put all actions in this array, skip those NULL's. */
731static void tcf_action_put_many(struct tc_action *actions[])
732{
733 int i;
734
735 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
736 struct tc_action *a = actions[i];
737 const struct tc_action_ops *ops;
738
739 if (!a)
740 continue;
741 ops = a->ops;
742 if (tcf_action_put(a))
743 module_put(ops->owner);
744 }
745}
746
747int
748tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
749{
750 return a->ops->dump(skb, a, bind, ref);
751}
752
753int
754tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
755{
756 int err = -EINVAL;
757 unsigned char *b = skb_tail_pointer(skb);
758 struct nlattr *nest;
759 struct tc_cookie *cookie;
760
761 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
762 goto nla_put_failure;
763 if (tcf_action_copy_stats(skb, a, 0))
764 goto nla_put_failure;
765
766 rcu_read_lock();
767 cookie = rcu_dereference(a->act_cookie);
768 if (cookie) {
769 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
770 rcu_read_unlock();
771 goto nla_put_failure;
772 }
773 }
774 rcu_read_unlock();
775
776 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
777 if (nest == NULL)
778 goto nla_put_failure;
779 err = tcf_action_dump_old(skb, a, bind, ref);
780 if (err > 0) {
781 nla_nest_end(skb, nest);
782 return err;
783 }
784
785nla_put_failure:
786 nlmsg_trim(skb, b);
787 return -1;
788}
789EXPORT_SYMBOL(tcf_action_dump_1);
790
791int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
792 int bind, int ref)
793{
794 struct tc_action *a;
795 int err = -EINVAL, i;
796 struct nlattr *nest;
797
798 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
799 a = actions[i];
800 nest = nla_nest_start_noflag(skb, i + 1);
801 if (nest == NULL)
802 goto nla_put_failure;
803 err = tcf_action_dump_1(skb, a, bind, ref);
804 if (err < 0)
805 goto errout;
806 nla_nest_end(skb, nest);
807 }
808
809 return 0;
810
811nla_put_failure:
812 err = -EINVAL;
813errout:
814 nla_nest_cancel(skb, nest);
815 return err;
816}
817
818static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
819{
820 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
821 if (!c)
822 return NULL;
823
824 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
825 if (!c->data) {
826 kfree(c);
827 return NULL;
828 }
829 c->len = nla_len(tb[TCA_ACT_COOKIE]);
830
831 return c;
832}
833
834static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
835 [TCA_ACT_KIND] = { .type = NLA_STRING },
836 [TCA_ACT_INDEX] = { .type = NLA_U32 },
837 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
838 .len = TC_COOKIE_MAX_SIZE },
839 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
840};
841
842struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
843 struct nlattr *nla, struct nlattr *est,
844 char *name, int ovr, int bind,
845 bool rtnl_held,
846 struct netlink_ext_ack *extack)
847{
848 struct tc_action *a;
849 struct tc_action_ops *a_o;
850 struct tc_cookie *cookie = NULL;
851 char act_name[IFNAMSIZ];
852 struct nlattr *tb[TCA_ACT_MAX + 1];
853 struct nlattr *kind;
854 int err;
855
856 if (name == NULL) {
857 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
858 tcf_action_policy, extack);
859 if (err < 0)
860 goto err_out;
861 err = -EINVAL;
862 kind = tb[TCA_ACT_KIND];
863 if (!kind) {
864 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
865 goto err_out;
866 }
867 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
868 NL_SET_ERR_MSG(extack, "TC action name too long");
869 goto err_out;
870 }
871 if (tb[TCA_ACT_COOKIE]) {
872 cookie = nla_memdup_cookie(tb);
873 if (!cookie) {
874 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
875 err = -ENOMEM;
876 goto err_out;
877 }
878 }
879 } else {
880 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
881 NL_SET_ERR_MSG(extack, "TC action name too long");
882 err = -EINVAL;
883 goto err_out;
884 }
885 }
886
887 a_o = tc_lookup_action_n(act_name);
888 if (a_o == NULL) {
889#ifdef CONFIG_MODULES
890 if (rtnl_held)
891 rtnl_unlock();
892 request_module("act_%s", act_name);
893 if (rtnl_held)
894 rtnl_lock();
895
896 a_o = tc_lookup_action_n(act_name);
897
898 /* We dropped the RTNL semaphore in order to
899 * perform the module load. So, even if we
900 * succeeded in loading the module we have to
901 * tell the caller to replay the request. We
902 * indicate this using -EAGAIN.
903 */
904 if (a_o != NULL) {
905 err = -EAGAIN;
906 goto err_mod;
907 }
908#endif
909 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
910 err = -ENOENT;
911 goto err_out;
912 }
913
914 /* backward compatibility for policer */
915 if (name == NULL)
916 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
917 rtnl_held, tp, extack);
918 else
919 err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
920 tp, extack);
921 if (err < 0)
922 goto err_mod;
923
924 if (!name && tb[TCA_ACT_COOKIE])
925 tcf_set_action_cookie(&a->act_cookie, cookie);
926
927 /* module count goes up only when brand new policy is created
928 * if it exists and is only bound to in a_o->init() then
929 * ACT_P_CREATED is not returned (a zero is).
930 */
931 if (err != ACT_P_CREATED)
932 module_put(a_o->owner);
933
934 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN) &&
935 !rcu_access_pointer(a->goto_chain)) {
936 tcf_action_destroy_1(a, bind);
937 NL_SET_ERR_MSG(extack, "can't use goto chain with NULL chain");
938 return ERR_PTR(-EINVAL);
939 }
940
941 return a;
942
943err_mod:
944 module_put(a_o->owner);
945err_out:
946 if (cookie) {
947 kfree(cookie->data);
948 kfree(cookie);
949 }
950 return ERR_PTR(err);
951}
952
953/* Returns numbers of initialized actions or negative error. */
954
955int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
956 struct nlattr *est, char *name, int ovr, int bind,
957 struct tc_action *actions[], size_t *attr_size,
958 bool rtnl_held, struct netlink_ext_ack *extack)
959{
960 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
961 struct tc_action *act;
962 size_t sz = 0;
963 int err;
964 int i;
965
966 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
967 extack);
968 if (err < 0)
969 return err;
970
971 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
972 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
973 rtnl_held, extack);
974 if (IS_ERR(act)) {
975 err = PTR_ERR(act);
976 goto err;
977 }
978 act->order = i;
979 sz += tcf_action_fill_size(act);
980 /* Start from index 0 */
981 actions[i - 1] = act;
982 }
983
984 *attr_size = tcf_action_full_attrs_size(sz);
985 return i - 1;
986
987err:
988 tcf_action_destroy(actions, bind);
989 return err;
990}
991
992int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
993 int compat_mode)
994{
995 int err = 0;
996 struct gnet_dump d;
997
998 if (p == NULL)
999 goto errout;
1000
1001 /* compat_mode being true specifies a call that is supposed
1002 * to add additional backward compatibility statistic TLVs.
1003 */
1004 if (compat_mode) {
1005 if (p->type == TCA_OLD_COMPAT)
1006 err = gnet_stats_start_copy_compat(skb, 0,
1007 TCA_STATS,
1008 TCA_XSTATS,
1009 &p->tcfa_lock, &d,
1010 TCA_PAD);
1011 else
1012 return 0;
1013 } else
1014 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1015 &p->tcfa_lock, &d, TCA_ACT_PAD);
1016
1017 if (err < 0)
1018 goto errout;
1019
1020 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
1021 gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
1022 &p->tcfa_bstats_hw) < 0 ||
1023 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1024 gnet_stats_copy_queue(&d, p->cpu_qstats,
1025 &p->tcfa_qstats,
1026 p->tcfa_qstats.qlen) < 0)
1027 goto errout;
1028
1029 if (gnet_stats_finish_copy(&d) < 0)
1030 goto errout;
1031
1032 return 0;
1033
1034errout:
1035 return -1;
1036}
1037
1038static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1039 u32 portid, u32 seq, u16 flags, int event, int bind,
1040 int ref)
1041{
1042 struct tcamsg *t;
1043 struct nlmsghdr *nlh;
1044 unsigned char *b = skb_tail_pointer(skb);
1045 struct nlattr *nest;
1046
1047 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1048 if (!nlh)
1049 goto out_nlmsg_trim;
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_noflag(skb, TCA_ACT_TAB);
1056 if (!nest)
1057 goto out_nlmsg_trim;
1058
1059 if (tcf_action_dump(skb, actions, bind, ref) < 0)
1060 goto out_nlmsg_trim;
1061
1062 nla_nest_end(skb, nest);
1063
1064 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1065 return skb->len;
1066
1067out_nlmsg_trim:
1068 nlmsg_trim(skb, b);
1069 return -1;
1070}
1071
1072static int
1073tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1074 struct tc_action *actions[], int event,
1075 struct netlink_ext_ack *extack)
1076{
1077 struct sk_buff *skb;
1078
1079 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1080 if (!skb)
1081 return -ENOBUFS;
1082 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1083 0, 1) <= 0) {
1084 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1085 kfree_skb(skb);
1086 return -EINVAL;
1087 }
1088
1089 return rtnl_unicast(skb, net, portid);
1090}
1091
1092static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1093 struct nlmsghdr *n, u32 portid,
1094 struct netlink_ext_ack *extack)
1095{
1096 struct nlattr *tb[TCA_ACT_MAX + 1];
1097 const struct tc_action_ops *ops;
1098 struct tc_action *a;
1099 int index;
1100 int err;
1101
1102 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1103 tcf_action_policy, extack);
1104 if (err < 0)
1105 goto err_out;
1106
1107 err = -EINVAL;
1108 if (tb[TCA_ACT_INDEX] == NULL ||
1109 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1110 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1111 goto err_out;
1112 }
1113 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1114
1115 err = -EINVAL;
1116 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1117 if (!ops) { /* could happen in batch of actions */
1118 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1119 goto err_out;
1120 }
1121 err = -ENOENT;
1122 if (ops->lookup(net, &a, index) == 0) {
1123 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1124 goto err_mod;
1125 }
1126
1127 module_put(ops->owner);
1128 return a;
1129
1130err_mod:
1131 module_put(ops->owner);
1132err_out:
1133 return ERR_PTR(err);
1134}
1135
1136static int tca_action_flush(struct net *net, struct nlattr *nla,
1137 struct nlmsghdr *n, u32 portid,
1138 struct netlink_ext_ack *extack)
1139{
1140 struct sk_buff *skb;
1141 unsigned char *b;
1142 struct nlmsghdr *nlh;
1143 struct tcamsg *t;
1144 struct netlink_callback dcb;
1145 struct nlattr *nest;
1146 struct nlattr *tb[TCA_ACT_MAX + 1];
1147 const struct tc_action_ops *ops;
1148 struct nlattr *kind;
1149 int err = -ENOMEM;
1150
1151 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1152 if (!skb)
1153 return err;
1154
1155 b = skb_tail_pointer(skb);
1156
1157 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1158 tcf_action_policy, extack);
1159 if (err < 0)
1160 goto err_out;
1161
1162 err = -EINVAL;
1163 kind = tb[TCA_ACT_KIND];
1164 ops = tc_lookup_action(kind);
1165 if (!ops) { /*some idjot trying to flush unknown action */
1166 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1167 goto err_out;
1168 }
1169
1170 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1171 sizeof(*t), 0);
1172 if (!nlh) {
1173 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1174 goto out_module_put;
1175 }
1176 t = nlmsg_data(nlh);
1177 t->tca_family = AF_UNSPEC;
1178 t->tca__pad1 = 0;
1179 t->tca__pad2 = 0;
1180
1181 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1182 if (!nest) {
1183 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1184 goto out_module_put;
1185 }
1186
1187 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1188 if (err <= 0) {
1189 nla_nest_cancel(skb, nest);
1190 goto out_module_put;
1191 }
1192
1193 nla_nest_end(skb, nest);
1194
1195 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1196 nlh->nlmsg_flags |= NLM_F_ROOT;
1197 module_put(ops->owner);
1198 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1199 n->nlmsg_flags & NLM_F_ECHO);
1200 if (err > 0)
1201 return 0;
1202 if (err < 0)
1203 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1204
1205 return err;
1206
1207out_module_put:
1208 module_put(ops->owner);
1209err_out:
1210 kfree_skb(skb);
1211 return err;
1212}
1213
1214static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1215{
1216 int i;
1217
1218 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1219 struct tc_action *a = actions[i];
1220 const struct tc_action_ops *ops = a->ops;
1221 /* Actions can be deleted concurrently so we must save their
1222 * type and id to search again after reference is released.
1223 */
1224 struct tcf_idrinfo *idrinfo = a->idrinfo;
1225 u32 act_index = a->tcfa_index;
1226
1227 actions[i] = NULL;
1228 if (tcf_action_put(a)) {
1229 /* last reference, action was deleted concurrently */
1230 module_put(ops->owner);
1231 } else {
1232 int ret;
1233
1234 /* now do the delete */
1235 ret = tcf_idr_delete_index(idrinfo, act_index);
1236 if (ret < 0)
1237 return ret;
1238 }
1239 }
1240 return 0;
1241}
1242
1243static int
1244tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1245 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1246{
1247 int ret;
1248 struct sk_buff *skb;
1249
1250 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1251 GFP_KERNEL);
1252 if (!skb)
1253 return -ENOBUFS;
1254
1255 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1256 0, 2) <= 0) {
1257 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1258 kfree_skb(skb);
1259 return -EINVAL;
1260 }
1261
1262 /* now do the delete */
1263 ret = tcf_action_delete(net, actions);
1264 if (ret < 0) {
1265 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1266 kfree_skb(skb);
1267 return ret;
1268 }
1269
1270 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1271 n->nlmsg_flags & NLM_F_ECHO);
1272 if (ret > 0)
1273 return 0;
1274 return ret;
1275}
1276
1277static int
1278tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1279 u32 portid, int event, struct netlink_ext_ack *extack)
1280{
1281 int i, ret;
1282 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1283 struct tc_action *act;
1284 size_t attr_size = 0;
1285 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1286
1287 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1288 extack);
1289 if (ret < 0)
1290 return ret;
1291
1292 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1293 if (tb[1])
1294 return tca_action_flush(net, tb[1], n, portid, extack);
1295
1296 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1297 return -EINVAL;
1298 }
1299
1300 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1301 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1302 if (IS_ERR(act)) {
1303 ret = PTR_ERR(act);
1304 goto err;
1305 }
1306 attr_size += tcf_action_fill_size(act);
1307 actions[i - 1] = act;
1308 }
1309
1310 attr_size = tcf_action_full_attrs_size(attr_size);
1311
1312 if (event == RTM_GETACTION)
1313 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1314 else { /* delete */
1315 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1316 if (ret)
1317 goto err;
1318 return 0;
1319 }
1320err:
1321 tcf_action_put_many(actions);
1322 return ret;
1323}
1324
1325static int
1326tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1327 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1328{
1329 struct sk_buff *skb;
1330 int err = 0;
1331
1332 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1333 GFP_KERNEL);
1334 if (!skb)
1335 return -ENOBUFS;
1336
1337 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1338 RTM_NEWACTION, 0, 0) <= 0) {
1339 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1340 kfree_skb(skb);
1341 return -EINVAL;
1342 }
1343
1344 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1345 n->nlmsg_flags & NLM_F_ECHO);
1346 if (err > 0)
1347 err = 0;
1348 return err;
1349}
1350
1351static int tcf_action_add(struct net *net, struct nlattr *nla,
1352 struct nlmsghdr *n, u32 portid, int ovr,
1353 struct netlink_ext_ack *extack)
1354{
1355 size_t attr_size = 0;
1356 int loop, ret;
1357 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1358
1359 for (loop = 0; loop < 10; loop++) {
1360 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0,
1361 actions, &attr_size, true, extack);
1362 if (ret != -EAGAIN)
1363 break;
1364 }
1365
1366 if (ret < 0)
1367 return ret;
1368 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1369 if (ovr)
1370 tcf_action_put_many(actions);
1371
1372 return ret;
1373}
1374
1375static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1376static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1377 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1378 .validation_data = &tcaa_root_flags_allowed },
1379 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1380};
1381
1382static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1383 struct netlink_ext_ack *extack)
1384{
1385 struct net *net = sock_net(skb->sk);
1386 struct nlattr *tca[TCA_ROOT_MAX + 1];
1387 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1388 int ret = 0, ovr = 0;
1389
1390 if ((n->nlmsg_type != RTM_GETACTION) &&
1391 !netlink_capable(skb, CAP_NET_ADMIN))
1392 return -EPERM;
1393
1394 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
1395 TCA_ROOT_MAX, NULL, extack);
1396 if (ret < 0)
1397 return ret;
1398
1399 if (tca[TCA_ACT_TAB] == NULL) {
1400 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1401 return -EINVAL;
1402 }
1403
1404 /* n->nlmsg_flags & NLM_F_CREATE */
1405 switch (n->nlmsg_type) {
1406 case RTM_NEWACTION:
1407 /* we are going to assume all other flags
1408 * imply create only if it doesn't exist
1409 * Note that CREATE | EXCL implies that
1410 * but since we want avoid ambiguity (eg when flags
1411 * is zero) then just set this
1412 */
1413 if (n->nlmsg_flags & NLM_F_REPLACE)
1414 ovr = 1;
1415 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1416 extack);
1417 break;
1418 case RTM_DELACTION:
1419 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1420 portid, RTM_DELACTION, extack);
1421 break;
1422 case RTM_GETACTION:
1423 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1424 portid, RTM_GETACTION, extack);
1425 break;
1426 default:
1427 BUG();
1428 }
1429
1430 return ret;
1431}
1432
1433static struct nlattr *find_dump_kind(struct nlattr **nla)
1434{
1435 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1436 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1437 struct nlattr *kind;
1438
1439 tb1 = nla[TCA_ACT_TAB];
1440 if (tb1 == NULL)
1441 return NULL;
1442
1443 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1444 return NULL;
1445
1446 if (tb[1] == NULL)
1447 return NULL;
1448 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
1449 return NULL;
1450 kind = tb2[TCA_ACT_KIND];
1451
1452 return kind;
1453}
1454
1455static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1456{
1457 struct net *net = sock_net(skb->sk);
1458 struct nlmsghdr *nlh;
1459 unsigned char *b = skb_tail_pointer(skb);
1460 struct nlattr *nest;
1461 struct tc_action_ops *a_o;
1462 int ret = 0;
1463 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1464 struct nlattr *tb[TCA_ROOT_MAX + 1];
1465 struct nlattr *count_attr = NULL;
1466 unsigned long jiffy_since = 0;
1467 struct nlattr *kind = NULL;
1468 struct nla_bitfield32 bf;
1469 u32 msecs_since = 0;
1470 u32 act_count = 0;
1471
1472 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
1473 TCA_ROOT_MAX, tcaa_policy, cb->extack);
1474 if (ret < 0)
1475 return ret;
1476
1477 kind = find_dump_kind(tb);
1478 if (kind == NULL) {
1479 pr_info("tc_dump_action: action bad kind\n");
1480 return 0;
1481 }
1482
1483 a_o = tc_lookup_action(kind);
1484 if (a_o == NULL)
1485 return 0;
1486
1487 cb->args[2] = 0;
1488 if (tb[TCA_ROOT_FLAGS]) {
1489 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1490 cb->args[2] = bf.value;
1491 }
1492
1493 if (tb[TCA_ROOT_TIME_DELTA]) {
1494 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1495 }
1496
1497 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1498 cb->nlh->nlmsg_type, sizeof(*t), 0);
1499 if (!nlh)
1500 goto out_module_put;
1501
1502 if (msecs_since)
1503 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1504
1505 t = nlmsg_data(nlh);
1506 t->tca_family = AF_UNSPEC;
1507 t->tca__pad1 = 0;
1508 t->tca__pad2 = 0;
1509 cb->args[3] = jiffy_since;
1510 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1511 if (!count_attr)
1512 goto out_module_put;
1513
1514 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1515 if (nest == NULL)
1516 goto out_module_put;
1517
1518 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1519 if (ret < 0)
1520 goto out_module_put;
1521
1522 if (ret > 0) {
1523 nla_nest_end(skb, nest);
1524 ret = skb->len;
1525 act_count = cb->args[1];
1526 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1527 cb->args[1] = 0;
1528 } else
1529 nlmsg_trim(skb, b);
1530
1531 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1532 if (NETLINK_CB(cb->skb).portid && ret)
1533 nlh->nlmsg_flags |= NLM_F_MULTI;
1534 module_put(a_o->owner);
1535 return skb->len;
1536
1537out_module_put:
1538 module_put(a_o->owner);
1539 nlmsg_trim(skb, b);
1540 return skb->len;
1541}
1542
1543static int __init tc_action_init(void)
1544{
1545 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1546 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1547 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1548 0);
1549
1550 return 0;
1551}
1552
1553subsys_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->act_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
172static bool tc_act_in_hw(struct tc_action *act)
173{
174 return !!act->in_hw_count;
175}
176
177/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
178static bool tc_act_flags_valid(u32 flags)
179{
180 flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
181
182 return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
183}
184
185static int offload_action_init(struct flow_offload_action *fl_action,
186 struct tc_action *act,
187 enum offload_act_command cmd,
188 struct netlink_ext_ack *extack)
189{
190 int err;
191
192 fl_action->extack = extack;
193 fl_action->command = cmd;
194 fl_action->index = act->tcfa_index;
195
196 if (act->ops->offload_act_setup) {
197 spin_lock_bh(&act->tcfa_lock);
198 err = act->ops->offload_act_setup(act, fl_action, NULL,
199 false, extack);
200 spin_unlock_bh(&act->tcfa_lock);
201 return err;
202 }
203
204 return -EOPNOTSUPP;
205}
206
207static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
208 u32 *hw_count)
209{
210 int err;
211
212 err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
213 fl_act, NULL, NULL);
214 if (err < 0)
215 return err;
216
217 if (hw_count)
218 *hw_count = err;
219
220 return 0;
221}
222
223static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
224 u32 *hw_count,
225 flow_indr_block_bind_cb_t *cb,
226 void *cb_priv)
227{
228 int err;
229
230 err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
231 if (err < 0)
232 return err;
233
234 if (hw_count)
235 *hw_count = 1;
236
237 return 0;
238}
239
240static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
241 u32 *hw_count,
242 flow_indr_block_bind_cb_t *cb,
243 void *cb_priv)
244{
245 return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
246 cb, cb_priv) :
247 tcf_action_offload_cmd_ex(fl_act, hw_count);
248}
249
250static int tcf_action_offload_add_ex(struct tc_action *action,
251 struct netlink_ext_ack *extack,
252 flow_indr_block_bind_cb_t *cb,
253 void *cb_priv)
254{
255 bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
256 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
257 [0] = action,
258 };
259 struct flow_offload_action *fl_action;
260 u32 in_hw_count = 0;
261 int num, err = 0;
262
263 if (tc_act_skip_hw(action->tcfa_flags))
264 return 0;
265
266 num = tcf_offload_act_num_actions_single(action);
267 fl_action = offload_action_alloc(num);
268 if (!fl_action)
269 return -ENOMEM;
270
271 err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
272 if (err)
273 goto fl_err;
274
275 err = tc_setup_action(&fl_action->action, actions, extack);
276 if (err) {
277 NL_SET_ERR_MSG_MOD(extack,
278 "Failed to setup tc actions for offload");
279 goto fl_err;
280 }
281
282 err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
283 if (!err)
284 cb ? offload_action_hw_count_inc(action, in_hw_count) :
285 offload_action_hw_count_set(action, in_hw_count);
286
287 if (skip_sw && !tc_act_in_hw(action))
288 err = -EINVAL;
289
290 tc_cleanup_offload_action(&fl_action->action);
291
292fl_err:
293 kfree(fl_action);
294
295 return err;
296}
297
298/* offload the tc action after it is inserted */
299static int tcf_action_offload_add(struct tc_action *action,
300 struct netlink_ext_ack *extack)
301{
302 return tcf_action_offload_add_ex(action, extack, NULL, NULL);
303}
304
305int tcf_action_update_hw_stats(struct tc_action *action)
306{
307 struct flow_offload_action fl_act = {};
308 int err;
309
310 if (!tc_act_in_hw(action))
311 return -EOPNOTSUPP;
312
313 err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
314 if (err)
315 return err;
316
317 err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
318 if (!err) {
319 preempt_disable();
320 tcf_action_stats_update(action, fl_act.stats.bytes,
321 fl_act.stats.pkts,
322 fl_act.stats.drops,
323 fl_act.stats.lastused,
324 true);
325 preempt_enable();
326 action->used_hw_stats = fl_act.stats.used_hw_stats;
327 action->used_hw_stats_valid = true;
328 } else {
329 return -EOPNOTSUPP;
330 }
331
332 return 0;
333}
334EXPORT_SYMBOL(tcf_action_update_hw_stats);
335
336static int tcf_action_offload_del_ex(struct tc_action *action,
337 flow_indr_block_bind_cb_t *cb,
338 void *cb_priv)
339{
340 struct flow_offload_action fl_act = {};
341 u32 in_hw_count = 0;
342 int err = 0;
343
344 if (!tc_act_in_hw(action))
345 return 0;
346
347 err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
348 if (err)
349 return err;
350
351 err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
352 if (err < 0)
353 return err;
354
355 if (!cb && action->in_hw_count != in_hw_count)
356 return -EINVAL;
357
358 /* do not need to update hw state when deleting action */
359 if (cb && in_hw_count)
360 offload_action_hw_count_dec(action, in_hw_count);
361
362 return 0;
363}
364
365static int tcf_action_offload_del(struct tc_action *action)
366{
367 return tcf_action_offload_del_ex(action, NULL, NULL);
368}
369
370static void tcf_action_cleanup(struct tc_action *p)
371{
372 tcf_action_offload_del(p);
373 if (p->ops->cleanup)
374 p->ops->cleanup(p);
375
376 gen_kill_estimator(&p->tcfa_rate_est);
377 free_tcf(p);
378}
379
380static int __tcf_action_put(struct tc_action *p, bool bind)
381{
382 struct tcf_idrinfo *idrinfo = p->idrinfo;
383
384 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
385 if (bind)
386 atomic_dec(&p->tcfa_bindcnt);
387 idr_remove(&idrinfo->action_idr, p->tcfa_index);
388 mutex_unlock(&idrinfo->lock);
389
390 tcf_action_cleanup(p);
391 return 1;
392 }
393
394 if (bind)
395 atomic_dec(&p->tcfa_bindcnt);
396
397 return 0;
398}
399
400static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
401{
402 int ret = 0;
403
404 /* Release with strict==1 and bind==0 is only called through act API
405 * interface (classifiers always bind). Only case when action with
406 * positive reference count and zero bind count can exist is when it was
407 * also created with act API (unbinding last classifier will destroy the
408 * action if it was created by classifier). So only case when bind count
409 * can be changed after initial check is when unbound action is
410 * destroyed by act API while classifier binds to action with same id
411 * concurrently. This result either creation of new action(same behavior
412 * as before), or reusing existing action if concurrent process
413 * increments reference count before action is deleted. Both scenarios
414 * are acceptable.
415 */
416 if (p) {
417 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
418 return -EPERM;
419
420 if (__tcf_action_put(p, bind))
421 ret = ACT_P_DELETED;
422 }
423
424 return ret;
425}
426
427int tcf_idr_release(struct tc_action *a, bool bind)
428{
429 const struct tc_action_ops *ops = a->ops;
430 int ret;
431
432 ret = __tcf_idr_release(a, bind, false);
433 if (ret == ACT_P_DELETED)
434 module_put(ops->owner);
435 return ret;
436}
437EXPORT_SYMBOL(tcf_idr_release);
438
439static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
440{
441 struct tc_cookie *act_cookie;
442 u32 cookie_len = 0;
443
444 rcu_read_lock();
445 act_cookie = rcu_dereference(act->act_cookie);
446
447 if (act_cookie)
448 cookie_len = nla_total_size(act_cookie->len);
449 rcu_read_unlock();
450
451 return nla_total_size(0) /* action number nested */
452 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
453 + cookie_len /* TCA_ACT_COOKIE */
454 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
455 + nla_total_size(0) /* TCA_ACT_STATS nested */
456 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
457 /* TCA_STATS_BASIC */
458 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
459 /* TCA_STATS_PKT64 */
460 + nla_total_size_64bit(sizeof(u64))
461 /* TCA_STATS_QUEUE */
462 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
463 + nla_total_size(0) /* TCA_OPTIONS nested */
464 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
465}
466
467static size_t tcf_action_full_attrs_size(size_t sz)
468{
469 return NLMSG_HDRLEN /* struct nlmsghdr */
470 + sizeof(struct tcamsg)
471 + nla_total_size(0) /* TCA_ACT_TAB nested */
472 + sz;
473}
474
475static size_t tcf_action_fill_size(const struct tc_action *act)
476{
477 size_t sz = tcf_action_shared_attrs_size(act);
478
479 if (act->ops->get_fill_size)
480 return act->ops->get_fill_size(act) + sz;
481 return sz;
482}
483
484static int
485tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
486{
487 unsigned char *b = skb_tail_pointer(skb);
488 struct tc_cookie *cookie;
489
490 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
491 goto nla_put_failure;
492 if (tcf_action_copy_stats(skb, a, 0))
493 goto nla_put_failure;
494 if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
495 goto nla_put_failure;
496
497 rcu_read_lock();
498 cookie = rcu_dereference(a->act_cookie);
499 if (cookie) {
500 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
501 rcu_read_unlock();
502 goto nla_put_failure;
503 }
504 }
505 rcu_read_unlock();
506
507 return 0;
508
509nla_put_failure:
510 nlmsg_trim(skb, b);
511 return -1;
512}
513
514static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
515 struct netlink_callback *cb)
516{
517 int err = 0, index = -1, s_i = 0, n_i = 0;
518 u32 act_flags = cb->args[2];
519 unsigned long jiffy_since = cb->args[3];
520 struct nlattr *nest;
521 struct idr *idr = &idrinfo->action_idr;
522 struct tc_action *p;
523 unsigned long id = 1;
524 unsigned long tmp;
525
526 mutex_lock(&idrinfo->lock);
527
528 s_i = cb->args[0];
529
530 idr_for_each_entry_ul(idr, p, tmp, id) {
531 index++;
532 if (index < s_i)
533 continue;
534 if (IS_ERR(p))
535 continue;
536
537 if (jiffy_since &&
538 time_after(jiffy_since,
539 (unsigned long)p->tcfa_tm.lastuse))
540 continue;
541
542 nest = nla_nest_start_noflag(skb, n_i);
543 if (!nest) {
544 index--;
545 goto nla_put_failure;
546 }
547 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
548 tcf_action_dump_terse(skb, p, true) :
549 tcf_action_dump_1(skb, p, 0, 0);
550 if (err < 0) {
551 index--;
552 nlmsg_trim(skb, nest);
553 goto done;
554 }
555 nla_nest_end(skb, nest);
556 n_i++;
557 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
558 n_i >= TCA_ACT_MAX_PRIO)
559 goto done;
560 }
561done:
562 if (index >= 0)
563 cb->args[0] = index + 1;
564
565 mutex_unlock(&idrinfo->lock);
566 if (n_i) {
567 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
568 cb->args[1] = n_i;
569 }
570 return n_i;
571
572nla_put_failure:
573 nla_nest_cancel(skb, nest);
574 goto done;
575}
576
577static int tcf_idr_release_unsafe(struct tc_action *p)
578{
579 if (atomic_read(&p->tcfa_bindcnt) > 0)
580 return -EPERM;
581
582 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
583 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
584 tcf_action_cleanup(p);
585 return ACT_P_DELETED;
586 }
587
588 return 0;
589}
590
591static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
592 const struct tc_action_ops *ops,
593 struct netlink_ext_ack *extack)
594{
595 struct nlattr *nest;
596 int n_i = 0;
597 int ret = -EINVAL;
598 struct idr *idr = &idrinfo->action_idr;
599 struct tc_action *p;
600 unsigned long id = 1;
601 unsigned long tmp;
602
603 nest = nla_nest_start_noflag(skb, 0);
604 if (nest == NULL)
605 goto nla_put_failure;
606 if (nla_put_string(skb, TCA_KIND, ops->kind))
607 goto nla_put_failure;
608
609 ret = 0;
610 mutex_lock(&idrinfo->lock);
611 idr_for_each_entry_ul(idr, p, tmp, id) {
612 if (IS_ERR(p))
613 continue;
614 ret = tcf_idr_release_unsafe(p);
615 if (ret == ACT_P_DELETED)
616 module_put(ops->owner);
617 else if (ret < 0)
618 break;
619 n_i++;
620 }
621 mutex_unlock(&idrinfo->lock);
622 if (ret < 0) {
623 if (n_i)
624 NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
625 else
626 goto nla_put_failure;
627 }
628
629 ret = nla_put_u32(skb, TCA_FCNT, n_i);
630 if (ret)
631 goto nla_put_failure;
632 nla_nest_end(skb, nest);
633
634 return n_i;
635nla_put_failure:
636 nla_nest_cancel(skb, nest);
637 return ret;
638}
639
640int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
641 struct netlink_callback *cb, int type,
642 const struct tc_action_ops *ops,
643 struct netlink_ext_ack *extack)
644{
645 struct tcf_idrinfo *idrinfo = tn->idrinfo;
646
647 if (type == RTM_DELACTION) {
648 return tcf_del_walker(idrinfo, skb, ops, extack);
649 } else if (type == RTM_GETACTION) {
650 return tcf_dump_walker(idrinfo, skb, cb);
651 } else {
652 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
653 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
654 return -EINVAL;
655 }
656}
657EXPORT_SYMBOL(tcf_generic_walker);
658
659int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
660{
661 struct tcf_idrinfo *idrinfo = tn->idrinfo;
662 struct tc_action *p;
663
664 mutex_lock(&idrinfo->lock);
665 p = idr_find(&idrinfo->action_idr, index);
666 if (IS_ERR(p))
667 p = NULL;
668 else if (p)
669 refcount_inc(&p->tcfa_refcnt);
670 mutex_unlock(&idrinfo->lock);
671
672 if (p) {
673 *a = p;
674 return true;
675 }
676 return false;
677}
678EXPORT_SYMBOL(tcf_idr_search);
679
680static int __tcf_generic_walker(struct net *net, struct sk_buff *skb,
681 struct netlink_callback *cb, int type,
682 const struct tc_action_ops *ops,
683 struct netlink_ext_ack *extack)
684{
685 struct tc_action_net *tn = net_generic(net, ops->net_id);
686
687 if (unlikely(ops->walk))
688 return ops->walk(net, skb, cb, type, ops, extack);
689
690 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
691}
692
693static int __tcf_idr_search(struct net *net,
694 const struct tc_action_ops *ops,
695 struct tc_action **a, u32 index)
696{
697 struct tc_action_net *tn = net_generic(net, ops->net_id);
698
699 if (unlikely(ops->lookup))
700 return ops->lookup(net, a, index);
701
702 return tcf_idr_search(tn, a, index);
703}
704
705static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
706{
707 struct tc_action *p;
708 int ret = 0;
709
710 mutex_lock(&idrinfo->lock);
711 p = idr_find(&idrinfo->action_idr, index);
712 if (!p) {
713 mutex_unlock(&idrinfo->lock);
714 return -ENOENT;
715 }
716
717 if (!atomic_read(&p->tcfa_bindcnt)) {
718 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
719 struct module *owner = p->ops->owner;
720
721 WARN_ON(p != idr_remove(&idrinfo->action_idr,
722 p->tcfa_index));
723 mutex_unlock(&idrinfo->lock);
724
725 tcf_action_cleanup(p);
726 module_put(owner);
727 return 0;
728 }
729 ret = 0;
730 } else {
731 ret = -EPERM;
732 }
733
734 mutex_unlock(&idrinfo->lock);
735 return ret;
736}
737
738int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
739 struct tc_action **a, const struct tc_action_ops *ops,
740 int bind, bool cpustats, u32 flags)
741{
742 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
743 struct tcf_idrinfo *idrinfo = tn->idrinfo;
744 int err = -ENOMEM;
745
746 if (unlikely(!p))
747 return -ENOMEM;
748 refcount_set(&p->tcfa_refcnt, 1);
749 if (bind)
750 atomic_set(&p->tcfa_bindcnt, 1);
751
752 if (cpustats) {
753 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
754 if (!p->cpu_bstats)
755 goto err1;
756 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
757 if (!p->cpu_bstats_hw)
758 goto err2;
759 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
760 if (!p->cpu_qstats)
761 goto err3;
762 }
763 gnet_stats_basic_sync_init(&p->tcfa_bstats);
764 gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
765 spin_lock_init(&p->tcfa_lock);
766 p->tcfa_index = index;
767 p->tcfa_tm.install = jiffies;
768 p->tcfa_tm.lastuse = jiffies;
769 p->tcfa_tm.firstuse = 0;
770 p->tcfa_flags = flags;
771 if (est) {
772 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
773 &p->tcfa_rate_est,
774 &p->tcfa_lock, false, est);
775 if (err)
776 goto err4;
777 }
778
779 p->idrinfo = idrinfo;
780 __module_get(ops->owner);
781 p->ops = ops;
782 *a = p;
783 return 0;
784err4:
785 free_percpu(p->cpu_qstats);
786err3:
787 free_percpu(p->cpu_bstats_hw);
788err2:
789 free_percpu(p->cpu_bstats);
790err1:
791 kfree(p);
792 return err;
793}
794EXPORT_SYMBOL(tcf_idr_create);
795
796int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
797 struct nlattr *est, struct tc_action **a,
798 const struct tc_action_ops *ops, int bind,
799 u32 flags)
800{
801 /* Set cpustats according to actions flags. */
802 return tcf_idr_create(tn, index, est, a, ops, bind,
803 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
804}
805EXPORT_SYMBOL(tcf_idr_create_from_flags);
806
807/* Cleanup idr index that was allocated but not initialized. */
808
809void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
810{
811 struct tcf_idrinfo *idrinfo = tn->idrinfo;
812
813 mutex_lock(&idrinfo->lock);
814 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
815 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
816 mutex_unlock(&idrinfo->lock);
817}
818EXPORT_SYMBOL(tcf_idr_cleanup);
819
820/* Check if action with specified index exists. If actions is found, increments
821 * its reference and bind counters, and return 1. Otherwise insert temporary
822 * error pointer (to prevent concurrent users from inserting actions with same
823 * index) and return 0.
824 */
825
826int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
827 struct tc_action **a, int bind)
828{
829 struct tcf_idrinfo *idrinfo = tn->idrinfo;
830 struct tc_action *p;
831 int ret;
832
833again:
834 mutex_lock(&idrinfo->lock);
835 if (*index) {
836 p = idr_find(&idrinfo->action_idr, *index);
837 if (IS_ERR(p)) {
838 /* This means that another process allocated
839 * index but did not assign the pointer yet.
840 */
841 mutex_unlock(&idrinfo->lock);
842 goto again;
843 }
844
845 if (p) {
846 refcount_inc(&p->tcfa_refcnt);
847 if (bind)
848 atomic_inc(&p->tcfa_bindcnt);
849 *a = p;
850 ret = 1;
851 } else {
852 *a = NULL;
853 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
854 *index, GFP_KERNEL);
855 if (!ret)
856 idr_replace(&idrinfo->action_idr,
857 ERR_PTR(-EBUSY), *index);
858 }
859 } else {
860 *index = 1;
861 *a = NULL;
862 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
863 UINT_MAX, GFP_KERNEL);
864 if (!ret)
865 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
866 *index);
867 }
868 mutex_unlock(&idrinfo->lock);
869 return ret;
870}
871EXPORT_SYMBOL(tcf_idr_check_alloc);
872
873void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
874 struct tcf_idrinfo *idrinfo)
875{
876 struct idr *idr = &idrinfo->action_idr;
877 struct tc_action *p;
878 int ret;
879 unsigned long id = 1;
880 unsigned long tmp;
881
882 idr_for_each_entry_ul(idr, p, tmp, id) {
883 ret = __tcf_idr_release(p, false, true);
884 if (ret == ACT_P_DELETED)
885 module_put(ops->owner);
886 else if (ret < 0)
887 return;
888 }
889 idr_destroy(&idrinfo->action_idr);
890}
891EXPORT_SYMBOL(tcf_idrinfo_destroy);
892
893static LIST_HEAD(act_base);
894static DEFINE_RWLOCK(act_mod_lock);
895/* since act ops id is stored in pernet subsystem list,
896 * then there is no way to walk through only all the action
897 * subsystem, so we keep tc action pernet ops id for
898 * reoffload to walk through.
899 */
900static LIST_HEAD(act_pernet_id_list);
901static DEFINE_MUTEX(act_id_mutex);
902struct tc_act_pernet_id {
903 struct list_head list;
904 unsigned int id;
905};
906
907static int tcf_pernet_add_id_list(unsigned int id)
908{
909 struct tc_act_pernet_id *id_ptr;
910 int ret = 0;
911
912 mutex_lock(&act_id_mutex);
913 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
914 if (id_ptr->id == id) {
915 ret = -EEXIST;
916 goto err_out;
917 }
918 }
919
920 id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
921 if (!id_ptr) {
922 ret = -ENOMEM;
923 goto err_out;
924 }
925 id_ptr->id = id;
926
927 list_add_tail(&id_ptr->list, &act_pernet_id_list);
928
929err_out:
930 mutex_unlock(&act_id_mutex);
931 return ret;
932}
933
934static void tcf_pernet_del_id_list(unsigned int id)
935{
936 struct tc_act_pernet_id *id_ptr;
937
938 mutex_lock(&act_id_mutex);
939 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
940 if (id_ptr->id == id) {
941 list_del(&id_ptr->list);
942 kfree(id_ptr);
943 break;
944 }
945 }
946 mutex_unlock(&act_id_mutex);
947}
948
949int tcf_register_action(struct tc_action_ops *act,
950 struct pernet_operations *ops)
951{
952 struct tc_action_ops *a;
953 int ret;
954
955 if (!act->act || !act->dump || !act->init)
956 return -EINVAL;
957
958 /* We have to register pernet ops before making the action ops visible,
959 * otherwise tcf_action_init_1() could get a partially initialized
960 * netns.
961 */
962 ret = register_pernet_subsys(ops);
963 if (ret)
964 return ret;
965
966 if (ops->id) {
967 ret = tcf_pernet_add_id_list(*ops->id);
968 if (ret)
969 goto err_id;
970 }
971
972 write_lock(&act_mod_lock);
973 list_for_each_entry(a, &act_base, head) {
974 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
975 ret = -EEXIST;
976 goto err_out;
977 }
978 }
979 list_add_tail(&act->head, &act_base);
980 write_unlock(&act_mod_lock);
981
982 return 0;
983
984err_out:
985 write_unlock(&act_mod_lock);
986 if (ops->id)
987 tcf_pernet_del_id_list(*ops->id);
988err_id:
989 unregister_pernet_subsys(ops);
990 return ret;
991}
992EXPORT_SYMBOL(tcf_register_action);
993
994int tcf_unregister_action(struct tc_action_ops *act,
995 struct pernet_operations *ops)
996{
997 struct tc_action_ops *a;
998 int err = -ENOENT;
999
1000 write_lock(&act_mod_lock);
1001 list_for_each_entry(a, &act_base, head) {
1002 if (a == act) {
1003 list_del(&act->head);
1004 err = 0;
1005 break;
1006 }
1007 }
1008 write_unlock(&act_mod_lock);
1009 if (!err) {
1010 unregister_pernet_subsys(ops);
1011 if (ops->id)
1012 tcf_pernet_del_id_list(*ops->id);
1013 }
1014 return err;
1015}
1016EXPORT_SYMBOL(tcf_unregister_action);
1017
1018/* lookup by name */
1019static struct tc_action_ops *tc_lookup_action_n(char *kind)
1020{
1021 struct tc_action_ops *a, *res = NULL;
1022
1023 if (kind) {
1024 read_lock(&act_mod_lock);
1025 list_for_each_entry(a, &act_base, head) {
1026 if (strcmp(kind, a->kind) == 0) {
1027 if (try_module_get(a->owner))
1028 res = a;
1029 break;
1030 }
1031 }
1032 read_unlock(&act_mod_lock);
1033 }
1034 return res;
1035}
1036
1037/* lookup by nlattr */
1038static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1039{
1040 struct tc_action_ops *a, *res = NULL;
1041
1042 if (kind) {
1043 read_lock(&act_mod_lock);
1044 list_for_each_entry(a, &act_base, head) {
1045 if (nla_strcmp(kind, a->kind) == 0) {
1046 if (try_module_get(a->owner))
1047 res = a;
1048 break;
1049 }
1050 }
1051 read_unlock(&act_mod_lock);
1052 }
1053 return res;
1054}
1055
1056/*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1057#define TCA_ACT_MAX_PRIO_MASK 0x1FF
1058int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1059 int nr_actions, struct tcf_result *res)
1060{
1061 u32 jmp_prgcnt = 0;
1062 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1063 int i;
1064 int ret = TC_ACT_OK;
1065
1066 if (skb_skip_tc_classify(skb))
1067 return TC_ACT_OK;
1068
1069restart_act_graph:
1070 for (i = 0; i < nr_actions; i++) {
1071 const struct tc_action *a = actions[i];
1072 int repeat_ttl;
1073
1074 if (jmp_prgcnt > 0) {
1075 jmp_prgcnt -= 1;
1076 continue;
1077 }
1078
1079 if (tc_act_skip_sw(a->tcfa_flags))
1080 continue;
1081
1082 repeat_ttl = 32;
1083repeat:
1084 ret = tc_act(skb, a, res);
1085 if (unlikely(ret == TC_ACT_REPEAT)) {
1086 if (--repeat_ttl != 0)
1087 goto repeat;
1088 /* suspicious opcode, stop pipeline */
1089 net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1090 return TC_ACT_OK;
1091 }
1092 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1093 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1094 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1095 /* faulty opcode, stop pipeline */
1096 return TC_ACT_OK;
1097 } else {
1098 jmp_ttl -= 1;
1099 if (jmp_ttl > 0)
1100 goto restart_act_graph;
1101 else /* faulty graph, stop pipeline */
1102 return TC_ACT_OK;
1103 }
1104 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1105 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1106 net_warn_ratelimited("can't go to NULL chain!\n");
1107 return TC_ACT_SHOT;
1108 }
1109 tcf_action_goto_chain_exec(a, res);
1110 }
1111
1112 if (ret != TC_ACT_PIPE)
1113 break;
1114 }
1115
1116 return ret;
1117}
1118EXPORT_SYMBOL(tcf_action_exec);
1119
1120int tcf_action_destroy(struct tc_action *actions[], int bind)
1121{
1122 const struct tc_action_ops *ops;
1123 struct tc_action *a;
1124 int ret = 0, i;
1125
1126 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1127 a = actions[i];
1128 actions[i] = NULL;
1129 ops = a->ops;
1130 ret = __tcf_idr_release(a, bind, true);
1131 if (ret == ACT_P_DELETED)
1132 module_put(ops->owner);
1133 else if (ret < 0)
1134 return ret;
1135 }
1136 return ret;
1137}
1138
1139static int tcf_action_put(struct tc_action *p)
1140{
1141 return __tcf_action_put(p, false);
1142}
1143
1144/* Put all actions in this array, skip those NULL's. */
1145static void tcf_action_put_many(struct tc_action *actions[])
1146{
1147 int i;
1148
1149 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1150 struct tc_action *a = actions[i];
1151 const struct tc_action_ops *ops;
1152
1153 if (!a)
1154 continue;
1155 ops = a->ops;
1156 if (tcf_action_put(a))
1157 module_put(ops->owner);
1158 }
1159}
1160
1161int
1162tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1163{
1164 return a->ops->dump(skb, a, bind, ref);
1165}
1166
1167int
1168tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1169{
1170 int err = -EINVAL;
1171 unsigned char *b = skb_tail_pointer(skb);
1172 struct nlattr *nest;
1173 u32 flags;
1174
1175 if (tcf_action_dump_terse(skb, a, false))
1176 goto nla_put_failure;
1177
1178 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
1179 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
1180 a->hw_stats, TCA_ACT_HW_STATS_ANY))
1181 goto nla_put_failure;
1182
1183 if (a->used_hw_stats_valid &&
1184 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
1185 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
1186 goto nla_put_failure;
1187
1188 flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
1189 if (flags &&
1190 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
1191 flags, flags))
1192 goto nla_put_failure;
1193
1194 if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
1195 goto nla_put_failure;
1196
1197 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
1198 if (nest == NULL)
1199 goto nla_put_failure;
1200 err = tcf_action_dump_old(skb, a, bind, ref);
1201 if (err > 0) {
1202 nla_nest_end(skb, nest);
1203 return err;
1204 }
1205
1206nla_put_failure:
1207 nlmsg_trim(skb, b);
1208 return -1;
1209}
1210EXPORT_SYMBOL(tcf_action_dump_1);
1211
1212int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1213 int bind, int ref, bool terse)
1214{
1215 struct tc_action *a;
1216 int err = -EINVAL, i;
1217 struct nlattr *nest;
1218
1219 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1220 a = actions[i];
1221 nest = nla_nest_start_noflag(skb, i + 1);
1222 if (nest == NULL)
1223 goto nla_put_failure;
1224 err = terse ? tcf_action_dump_terse(skb, a, false) :
1225 tcf_action_dump_1(skb, a, bind, ref);
1226 if (err < 0)
1227 goto errout;
1228 nla_nest_end(skb, nest);
1229 }
1230
1231 return 0;
1232
1233nla_put_failure:
1234 err = -EINVAL;
1235errout:
1236 nla_nest_cancel(skb, nest);
1237 return err;
1238}
1239
1240static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1241{
1242 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1243 if (!c)
1244 return NULL;
1245
1246 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1247 if (!c->data) {
1248 kfree(c);
1249 return NULL;
1250 }
1251 c->len = nla_len(tb[TCA_ACT_COOKIE]);
1252
1253 return c;
1254}
1255
1256static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1257{
1258 struct nla_bitfield32 hw_stats_bf;
1259
1260 /* If the user did not pass the attr, that means he does
1261 * not care about the type. Return "any" in that case
1262 * which is setting on all supported types.
1263 */
1264 if (!hw_stats_attr)
1265 return TCA_ACT_HW_STATS_ANY;
1266 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
1267 return hw_stats_bf.value;
1268}
1269
1270static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1271 [TCA_ACT_KIND] = { .type = NLA_STRING },
1272 [TCA_ACT_INDEX] = { .type = NLA_U32 },
1273 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
1274 .len = TC_COOKIE_MAX_SIZE },
1275 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
1276 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1277 TCA_ACT_FLAGS_SKIP_HW |
1278 TCA_ACT_FLAGS_SKIP_SW),
1279 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1280};
1281
1282void tcf_idr_insert_many(struct tc_action *actions[])
1283{
1284 int i;
1285
1286 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1287 struct tc_action *a = actions[i];
1288 struct tcf_idrinfo *idrinfo;
1289
1290 if (!a)
1291 continue;
1292 idrinfo = a->idrinfo;
1293 mutex_lock(&idrinfo->lock);
1294 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if
1295 * it is just created, otherwise this is just a nop.
1296 */
1297 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1298 mutex_unlock(&idrinfo->lock);
1299 }
1300}
1301
1302struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police,
1303 bool rtnl_held,
1304 struct netlink_ext_ack *extack)
1305{
1306 struct nlattr *tb[TCA_ACT_MAX + 1];
1307 struct tc_action_ops *a_o;
1308 char act_name[IFNAMSIZ];
1309 struct nlattr *kind;
1310 int err;
1311
1312 if (!police) {
1313 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1314 tcf_action_policy, extack);
1315 if (err < 0)
1316 return ERR_PTR(err);
1317 err = -EINVAL;
1318 kind = tb[TCA_ACT_KIND];
1319 if (!kind) {
1320 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1321 return ERR_PTR(err);
1322 }
1323 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
1324 NL_SET_ERR_MSG(extack, "TC action name too long");
1325 return ERR_PTR(err);
1326 }
1327 } else {
1328 if (strlcpy(act_name, "police", IFNAMSIZ) >= IFNAMSIZ) {
1329 NL_SET_ERR_MSG(extack, "TC action name too long");
1330 return ERR_PTR(-EINVAL);
1331 }
1332 }
1333
1334 a_o = tc_lookup_action_n(act_name);
1335 if (a_o == NULL) {
1336#ifdef CONFIG_MODULES
1337 if (rtnl_held)
1338 rtnl_unlock();
1339 request_module("act_%s", act_name);
1340 if (rtnl_held)
1341 rtnl_lock();
1342
1343 a_o = tc_lookup_action_n(act_name);
1344
1345 /* We dropped the RTNL semaphore in order to
1346 * perform the module load. So, even if we
1347 * succeeded in loading the module we have to
1348 * tell the caller to replay the request. We
1349 * indicate this using -EAGAIN.
1350 */
1351 if (a_o != NULL) {
1352 module_put(a_o->owner);
1353 return ERR_PTR(-EAGAIN);
1354 }
1355#endif
1356 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1357 return ERR_PTR(-ENOENT);
1358 }
1359
1360 return a_o;
1361}
1362
1363struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1364 struct nlattr *nla, struct nlattr *est,
1365 struct tc_action_ops *a_o, int *init_res,
1366 u32 flags, struct netlink_ext_ack *extack)
1367{
1368 bool police = flags & TCA_ACT_FLAGS_POLICE;
1369 struct nla_bitfield32 userflags = { 0, 0 };
1370 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1371 struct nlattr *tb[TCA_ACT_MAX + 1];
1372 struct tc_cookie *cookie = NULL;
1373 struct tc_action *a;
1374 int err;
1375
1376 /* backward compatibility for policer */
1377 if (!police) {
1378 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1379 tcf_action_policy, extack);
1380 if (err < 0)
1381 return ERR_PTR(err);
1382 if (tb[TCA_ACT_COOKIE]) {
1383 cookie = nla_memdup_cookie(tb);
1384 if (!cookie) {
1385 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1386 err = -ENOMEM;
1387 goto err_out;
1388 }
1389 }
1390 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1391 if (tb[TCA_ACT_FLAGS]) {
1392 userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1393 if (!tc_act_flags_valid(userflags.value)) {
1394 err = -EINVAL;
1395 goto err_out;
1396 }
1397 }
1398
1399 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1400 userflags.value | flags, extack);
1401 } else {
1402 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1403 extack);
1404 }
1405 if (err < 0)
1406 goto err_out;
1407 *init_res = err;
1408
1409 if (!police && tb[TCA_ACT_COOKIE])
1410 tcf_set_action_cookie(&a->act_cookie, cookie);
1411
1412 if (!police)
1413 a->hw_stats = hw_stats;
1414
1415 return a;
1416
1417err_out:
1418 if (cookie) {
1419 kfree(cookie->data);
1420 kfree(cookie);
1421 }
1422 return ERR_PTR(err);
1423}
1424
1425static bool tc_act_bind(u32 flags)
1426{
1427 return !!(flags & TCA_ACT_FLAGS_BIND);
1428}
1429
1430/* Returns numbers of initialized actions or negative error. */
1431
1432int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1433 struct nlattr *est, struct tc_action *actions[],
1434 int init_res[], size_t *attr_size,
1435 u32 flags, u32 fl_flags,
1436 struct netlink_ext_ack *extack)
1437{
1438 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1439 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1440 struct tc_action *act;
1441 size_t sz = 0;
1442 int err;
1443 int i;
1444
1445 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1446 extack);
1447 if (err < 0)
1448 return err;
1449
1450 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1451 struct tc_action_ops *a_o;
1452
1453 a_o = tc_action_load_ops(tb[i], flags & TCA_ACT_FLAGS_POLICE,
1454 !(flags & TCA_ACT_FLAGS_NO_RTNL),
1455 extack);
1456 if (IS_ERR(a_o)) {
1457 err = PTR_ERR(a_o);
1458 goto err_mod;
1459 }
1460 ops[i - 1] = a_o;
1461 }
1462
1463 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1464 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1465 &init_res[i - 1], flags, extack);
1466 if (IS_ERR(act)) {
1467 err = PTR_ERR(act);
1468 goto err;
1469 }
1470 sz += tcf_action_fill_size(act);
1471 /* Start from index 0 */
1472 actions[i - 1] = act;
1473 if (tc_act_bind(flags)) {
1474 bool skip_sw = tc_skip_sw(fl_flags);
1475 bool skip_hw = tc_skip_hw(fl_flags);
1476
1477 if (tc_act_bind(act->tcfa_flags))
1478 continue;
1479 if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1480 skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
1481 NL_SET_ERR_MSG(extack,
1482 "Mismatch between action and filter offload flags");
1483 err = -EINVAL;
1484 goto err;
1485 }
1486 } else {
1487 err = tcf_action_offload_add(act, extack);
1488 if (tc_act_skip_sw(act->tcfa_flags) && err)
1489 goto err;
1490 }
1491 }
1492
1493 /* We have to commit them all together, because if any error happened in
1494 * between, we could not handle the failure gracefully.
1495 */
1496 tcf_idr_insert_many(actions);
1497
1498 *attr_size = tcf_action_full_attrs_size(sz);
1499 err = i - 1;
1500 goto err_mod;
1501
1502err:
1503 tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
1504err_mod:
1505 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1506 if (ops[i])
1507 module_put(ops[i]->owner);
1508 }
1509 return err;
1510}
1511
1512void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1513 u64 drops, bool hw)
1514{
1515 if (a->cpu_bstats) {
1516 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1517
1518 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1519
1520 if (hw)
1521 _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1522 bytes, packets);
1523 return;
1524 }
1525
1526 _bstats_update(&a->tcfa_bstats, bytes, packets);
1527 a->tcfa_qstats.drops += drops;
1528 if (hw)
1529 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1530}
1531EXPORT_SYMBOL(tcf_action_update_stats);
1532
1533int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1534 int compat_mode)
1535{
1536 int err = 0;
1537 struct gnet_dump d;
1538
1539 if (p == NULL)
1540 goto errout;
1541
1542 /* update hw stats for this action */
1543 tcf_action_update_hw_stats(p);
1544
1545 /* compat_mode being true specifies a call that is supposed
1546 * to add additional backward compatibility statistic TLVs.
1547 */
1548 if (compat_mode) {
1549 if (p->type == TCA_OLD_COMPAT)
1550 err = gnet_stats_start_copy_compat(skb, 0,
1551 TCA_STATS,
1552 TCA_XSTATS,
1553 &p->tcfa_lock, &d,
1554 TCA_PAD);
1555 else
1556 return 0;
1557 } else
1558 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1559 &p->tcfa_lock, &d, TCA_ACT_PAD);
1560
1561 if (err < 0)
1562 goto errout;
1563
1564 if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1565 &p->tcfa_bstats, false) < 0 ||
1566 gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1567 &p->tcfa_bstats_hw, false) < 0 ||
1568 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1569 gnet_stats_copy_queue(&d, p->cpu_qstats,
1570 &p->tcfa_qstats,
1571 p->tcfa_qstats.qlen) < 0)
1572 goto errout;
1573
1574 if (gnet_stats_finish_copy(&d) < 0)
1575 goto errout;
1576
1577 return 0;
1578
1579errout:
1580 return -1;
1581}
1582
1583static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1584 u32 portid, u32 seq, u16 flags, int event, int bind,
1585 int ref)
1586{
1587 struct tcamsg *t;
1588 struct nlmsghdr *nlh;
1589 unsigned char *b = skb_tail_pointer(skb);
1590 struct nlattr *nest;
1591
1592 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1593 if (!nlh)
1594 goto out_nlmsg_trim;
1595 t = nlmsg_data(nlh);
1596 t->tca_family = AF_UNSPEC;
1597 t->tca__pad1 = 0;
1598 t->tca__pad2 = 0;
1599
1600 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1601 if (!nest)
1602 goto out_nlmsg_trim;
1603
1604 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1605 goto out_nlmsg_trim;
1606
1607 nla_nest_end(skb, nest);
1608
1609 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1610 return skb->len;
1611
1612out_nlmsg_trim:
1613 nlmsg_trim(skb, b);
1614 return -1;
1615}
1616
1617static int
1618tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1619 struct tc_action *actions[], int event,
1620 struct netlink_ext_ack *extack)
1621{
1622 struct sk_buff *skb;
1623
1624 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1625 if (!skb)
1626 return -ENOBUFS;
1627 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1628 0, 1) <= 0) {
1629 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1630 kfree_skb(skb);
1631 return -EINVAL;
1632 }
1633
1634 return rtnl_unicast(skb, net, portid);
1635}
1636
1637static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1638 struct nlmsghdr *n, u32 portid,
1639 struct netlink_ext_ack *extack)
1640{
1641 struct nlattr *tb[TCA_ACT_MAX + 1];
1642 const struct tc_action_ops *ops;
1643 struct tc_action *a;
1644 int index;
1645 int err;
1646
1647 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1648 tcf_action_policy, extack);
1649 if (err < 0)
1650 goto err_out;
1651
1652 err = -EINVAL;
1653 if (tb[TCA_ACT_INDEX] == NULL ||
1654 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1655 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1656 goto err_out;
1657 }
1658 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1659
1660 err = -EINVAL;
1661 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1662 if (!ops) { /* could happen in batch of actions */
1663 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1664 goto err_out;
1665 }
1666 err = -ENOENT;
1667 if (__tcf_idr_search(net, ops, &a, index) == 0) {
1668 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1669 goto err_mod;
1670 }
1671
1672 module_put(ops->owner);
1673 return a;
1674
1675err_mod:
1676 module_put(ops->owner);
1677err_out:
1678 return ERR_PTR(err);
1679}
1680
1681static int tca_action_flush(struct net *net, struct nlattr *nla,
1682 struct nlmsghdr *n, u32 portid,
1683 struct netlink_ext_ack *extack)
1684{
1685 struct sk_buff *skb;
1686 unsigned char *b;
1687 struct nlmsghdr *nlh;
1688 struct tcamsg *t;
1689 struct netlink_callback dcb;
1690 struct nlattr *nest;
1691 struct nlattr *tb[TCA_ACT_MAX + 1];
1692 const struct tc_action_ops *ops;
1693 struct nlattr *kind;
1694 int err = -ENOMEM;
1695
1696 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1697 if (!skb)
1698 return err;
1699
1700 b = skb_tail_pointer(skb);
1701
1702 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1703 tcf_action_policy, extack);
1704 if (err < 0)
1705 goto err_out;
1706
1707 err = -EINVAL;
1708 kind = tb[TCA_ACT_KIND];
1709 ops = tc_lookup_action(kind);
1710 if (!ops) { /*some idjot trying to flush unknown action */
1711 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1712 goto err_out;
1713 }
1714
1715 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1716 sizeof(*t), 0);
1717 if (!nlh) {
1718 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1719 goto out_module_put;
1720 }
1721 t = nlmsg_data(nlh);
1722 t->tca_family = AF_UNSPEC;
1723 t->tca__pad1 = 0;
1724 t->tca__pad2 = 0;
1725
1726 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1727 if (!nest) {
1728 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1729 goto out_module_put;
1730 }
1731
1732 err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack);
1733 if (err <= 0) {
1734 nla_nest_cancel(skb, nest);
1735 goto out_module_put;
1736 }
1737
1738 nla_nest_end(skb, nest);
1739
1740 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1741 nlh->nlmsg_flags |= NLM_F_ROOT;
1742 module_put(ops->owner);
1743 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1744 n->nlmsg_flags & NLM_F_ECHO);
1745 if (err < 0)
1746 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1747
1748 return err;
1749
1750out_module_put:
1751 module_put(ops->owner);
1752err_out:
1753 kfree_skb(skb);
1754 return err;
1755}
1756
1757static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1758{
1759 int i;
1760
1761 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1762 struct tc_action *a = actions[i];
1763 const struct tc_action_ops *ops = a->ops;
1764 /* Actions can be deleted concurrently so we must save their
1765 * type and id to search again after reference is released.
1766 */
1767 struct tcf_idrinfo *idrinfo = a->idrinfo;
1768 u32 act_index = a->tcfa_index;
1769
1770 actions[i] = NULL;
1771 if (tcf_action_put(a)) {
1772 /* last reference, action was deleted concurrently */
1773 module_put(ops->owner);
1774 } else {
1775 int ret;
1776
1777 /* now do the delete */
1778 ret = tcf_idr_delete_index(idrinfo, act_index);
1779 if (ret < 0)
1780 return ret;
1781 }
1782 }
1783 return 0;
1784}
1785
1786static int
1787tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1788{
1789 size_t attr_size = tcf_action_fill_size(action);
1790 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1791 [0] = action,
1792 };
1793 const struct tc_action_ops *ops = action->ops;
1794 struct sk_buff *skb;
1795 int ret;
1796
1797 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1798 GFP_KERNEL);
1799 if (!skb)
1800 return -ENOBUFS;
1801
1802 if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1) <= 0) {
1803 kfree_skb(skb);
1804 return -EINVAL;
1805 }
1806
1807 ret = tcf_idr_release_unsafe(action);
1808 if (ret == ACT_P_DELETED) {
1809 module_put(ops->owner);
1810 ret = rtnetlink_send(skb, net, 0, RTNLGRP_TC, 0);
1811 } else {
1812 kfree_skb(skb);
1813 }
1814
1815 return ret;
1816}
1817
1818int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1819 void *cb_priv, bool add)
1820{
1821 struct tc_act_pernet_id *id_ptr;
1822 struct tcf_idrinfo *idrinfo;
1823 struct tc_action_net *tn;
1824 struct tc_action *p;
1825 unsigned int act_id;
1826 unsigned long tmp;
1827 unsigned long id;
1828 struct idr *idr;
1829 struct net *net;
1830 int ret;
1831
1832 if (!cb)
1833 return -EINVAL;
1834
1835 down_read(&net_rwsem);
1836 mutex_lock(&act_id_mutex);
1837
1838 for_each_net(net) {
1839 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1840 act_id = id_ptr->id;
1841 tn = net_generic(net, act_id);
1842 if (!tn)
1843 continue;
1844 idrinfo = tn->idrinfo;
1845 if (!idrinfo)
1846 continue;
1847
1848 mutex_lock(&idrinfo->lock);
1849 idr = &idrinfo->action_idr;
1850 idr_for_each_entry_ul(idr, p, tmp, id) {
1851 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1852 continue;
1853 if (add) {
1854 tcf_action_offload_add_ex(p, NULL, cb,
1855 cb_priv);
1856 continue;
1857 }
1858
1859 /* cb unregister to update hw count */
1860 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1861 if (ret < 0)
1862 continue;
1863 if (tc_act_skip_sw(p->tcfa_flags) &&
1864 !tc_act_in_hw(p))
1865 tcf_reoffload_del_notify(net, p);
1866 }
1867 mutex_unlock(&idrinfo->lock);
1868 }
1869 }
1870 mutex_unlock(&act_id_mutex);
1871 up_read(&net_rwsem);
1872
1873 return 0;
1874}
1875
1876static int
1877tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1878 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1879{
1880 int ret;
1881 struct sk_buff *skb;
1882
1883 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1884 GFP_KERNEL);
1885 if (!skb)
1886 return -ENOBUFS;
1887
1888 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1889 0, 2) <= 0) {
1890 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1891 kfree_skb(skb);
1892 return -EINVAL;
1893 }
1894
1895 /* now do the delete */
1896 ret = tcf_action_delete(net, actions);
1897 if (ret < 0) {
1898 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1899 kfree_skb(skb);
1900 return ret;
1901 }
1902
1903 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1904 n->nlmsg_flags & NLM_F_ECHO);
1905 return ret;
1906}
1907
1908static int
1909tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1910 u32 portid, int event, struct netlink_ext_ack *extack)
1911{
1912 int i, ret;
1913 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1914 struct tc_action *act;
1915 size_t attr_size = 0;
1916 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1917
1918 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1919 extack);
1920 if (ret < 0)
1921 return ret;
1922
1923 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1924 if (tb[1])
1925 return tca_action_flush(net, tb[1], n, portid, extack);
1926
1927 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1928 return -EINVAL;
1929 }
1930
1931 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1932 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1933 if (IS_ERR(act)) {
1934 ret = PTR_ERR(act);
1935 goto err;
1936 }
1937 attr_size += tcf_action_fill_size(act);
1938 actions[i - 1] = act;
1939 }
1940
1941 attr_size = tcf_action_full_attrs_size(attr_size);
1942
1943 if (event == RTM_GETACTION)
1944 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1945 else { /* delete */
1946 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1947 if (ret)
1948 goto err;
1949 return 0;
1950 }
1951err:
1952 tcf_action_put_many(actions);
1953 return ret;
1954}
1955
1956static int
1957tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1958 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1959{
1960 struct sk_buff *skb;
1961
1962 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1963 GFP_KERNEL);
1964 if (!skb)
1965 return -ENOBUFS;
1966
1967 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1968 RTM_NEWACTION, 0, 0) <= 0) {
1969 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1970 kfree_skb(skb);
1971 return -EINVAL;
1972 }
1973
1974 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1975 n->nlmsg_flags & NLM_F_ECHO);
1976}
1977
1978static int tcf_action_add(struct net *net, struct nlattr *nla,
1979 struct nlmsghdr *n, u32 portid, u32 flags,
1980 struct netlink_ext_ack *extack)
1981{
1982 size_t attr_size = 0;
1983 int loop, ret, i;
1984 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1985 int init_res[TCA_ACT_MAX_PRIO] = {};
1986
1987 for (loop = 0; loop < 10; loop++) {
1988 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
1989 &attr_size, flags, 0, extack);
1990 if (ret != -EAGAIN)
1991 break;
1992 }
1993
1994 if (ret < 0)
1995 return ret;
1996 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1997
1998 /* only put existing actions */
1999 for (i = 0; i < TCA_ACT_MAX_PRIO; i++)
2000 if (init_res[i] == ACT_P_CREATED)
2001 actions[i] = NULL;
2002 tcf_action_put_many(actions);
2003
2004 return ret;
2005}
2006
2007static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
2008 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2009 TCA_ACT_FLAG_TERSE_DUMP),
2010 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
2011};
2012
2013static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2014 struct netlink_ext_ack *extack)
2015{
2016 struct net *net = sock_net(skb->sk);
2017 struct nlattr *tca[TCA_ROOT_MAX + 1];
2018 u32 portid = NETLINK_CB(skb).portid;
2019 u32 flags = 0;
2020 int ret = 0;
2021
2022 if ((n->nlmsg_type != RTM_GETACTION) &&
2023 !netlink_capable(skb, CAP_NET_ADMIN))
2024 return -EPERM;
2025
2026 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
2027 TCA_ROOT_MAX, NULL, extack);
2028 if (ret < 0)
2029 return ret;
2030
2031 if (tca[TCA_ACT_TAB] == NULL) {
2032 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2033 return -EINVAL;
2034 }
2035
2036 /* n->nlmsg_flags & NLM_F_CREATE */
2037 switch (n->nlmsg_type) {
2038 case RTM_NEWACTION:
2039 /* we are going to assume all other flags
2040 * imply create only if it doesn't exist
2041 * Note that CREATE | EXCL implies that
2042 * but since we want avoid ambiguity (eg when flags
2043 * is zero) then just set this
2044 */
2045 if (n->nlmsg_flags & NLM_F_REPLACE)
2046 flags = TCA_ACT_FLAGS_REPLACE;
2047 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
2048 extack);
2049 break;
2050 case RTM_DELACTION:
2051 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2052 portid, RTM_DELACTION, extack);
2053 break;
2054 case RTM_GETACTION:
2055 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2056 portid, RTM_GETACTION, extack);
2057 break;
2058 default:
2059 BUG();
2060 }
2061
2062 return ret;
2063}
2064
2065static struct nlattr *find_dump_kind(struct nlattr **nla)
2066{
2067 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2068 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2069 struct nlattr *kind;
2070
2071 tb1 = nla[TCA_ACT_TAB];
2072 if (tb1 == NULL)
2073 return NULL;
2074
2075 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2076 return NULL;
2077
2078 if (tb[1] == NULL)
2079 return NULL;
2080 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
2081 return NULL;
2082 kind = tb2[TCA_ACT_KIND];
2083
2084 return kind;
2085}
2086
2087static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2088{
2089 struct net *net = sock_net(skb->sk);
2090 struct nlmsghdr *nlh;
2091 unsigned char *b = skb_tail_pointer(skb);
2092 struct nlattr *nest;
2093 struct tc_action_ops *a_o;
2094 int ret = 0;
2095 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
2096 struct nlattr *tb[TCA_ROOT_MAX + 1];
2097 struct nlattr *count_attr = NULL;
2098 unsigned long jiffy_since = 0;
2099 struct nlattr *kind = NULL;
2100 struct nla_bitfield32 bf;
2101 u32 msecs_since = 0;
2102 u32 act_count = 0;
2103
2104 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2105 TCA_ROOT_MAX, tcaa_policy, cb->extack);
2106 if (ret < 0)
2107 return ret;
2108
2109 kind = find_dump_kind(tb);
2110 if (kind == NULL) {
2111 pr_info("tc_dump_action: action bad kind\n");
2112 return 0;
2113 }
2114
2115 a_o = tc_lookup_action(kind);
2116 if (a_o == NULL)
2117 return 0;
2118
2119 cb->args[2] = 0;
2120 if (tb[TCA_ROOT_FLAGS]) {
2121 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2122 cb->args[2] = bf.value;
2123 }
2124
2125 if (tb[TCA_ROOT_TIME_DELTA]) {
2126 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2127 }
2128
2129 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2130 cb->nlh->nlmsg_type, sizeof(*t), 0);
2131 if (!nlh)
2132 goto out_module_put;
2133
2134 if (msecs_since)
2135 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2136
2137 t = nlmsg_data(nlh);
2138 t->tca_family = AF_UNSPEC;
2139 t->tca__pad1 = 0;
2140 t->tca__pad2 = 0;
2141 cb->args[3] = jiffy_since;
2142 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2143 if (!count_attr)
2144 goto out_module_put;
2145
2146 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2147 if (nest == NULL)
2148 goto out_module_put;
2149
2150 ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL);
2151 if (ret < 0)
2152 goto out_module_put;
2153
2154 if (ret > 0) {
2155 nla_nest_end(skb, nest);
2156 ret = skb->len;
2157 act_count = cb->args[1];
2158 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2159 cb->args[1] = 0;
2160 } else
2161 nlmsg_trim(skb, b);
2162
2163 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2164 if (NETLINK_CB(cb->skb).portid && ret)
2165 nlh->nlmsg_flags |= NLM_F_MULTI;
2166 module_put(a_o->owner);
2167 return skb->len;
2168
2169out_module_put:
2170 module_put(a_o->owner);
2171 nlmsg_trim(skb, b);
2172 return skb->len;
2173}
2174
2175static int __init tc_action_init(void)
2176{
2177 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
2178 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
2179 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
2180 0);
2181
2182 return 0;
2183}
2184
2185subsys_initcall(tc_action_init);