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