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(objp: cookie->data);
57 kfree(objp: 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 = unrcu_pointer(xchg(old_cookie, RCU_INITIALIZER(new_cookie)));
66 if (old)
67 call_rcu(head: &old->rcu, func: 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(block: 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(pdata: p->cpu_bstats);
125 free_percpu(pdata: p->cpu_bstats_hw);
126 free_percpu(pdata: p->cpu_qstats);
127
128 tcf_set_action_cookie(old_cookie: &p->user_cookie, NULL);
129 if (chain)
130 tcf_chain_put_by_act(chain);
131
132 kfree(objp: 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(a: act))
157 return tcf_pedit_nkeys(a: act);
158 else
159 return 1;
160}
161
162static bool tc_act_skip_hw(u32 flags)
163{
164 return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
165}
166
167static bool tc_act_skip_sw(u32 flags)
168{
169 return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
170}
171
172/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
173static bool tc_act_flags_valid(u32 flags)
174{
175 flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
176
177 return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
178}
179
180static int offload_action_init(struct flow_offload_action *fl_action,
181 struct tc_action *act,
182 enum offload_act_command cmd,
183 struct netlink_ext_ack *extack)
184{
185 int err;
186
187 fl_action->extack = extack;
188 fl_action->command = cmd;
189 fl_action->index = act->tcfa_index;
190 fl_action->cookie = (unsigned long)act;
191
192 if (act->ops->offload_act_setup) {
193 spin_lock_bh(lock: &act->tcfa_lock);
194 err = act->ops->offload_act_setup(act, fl_action, NULL,
195 false, extack);
196 spin_unlock_bh(lock: &act->tcfa_lock);
197 return err;
198 }
199
200 return -EOPNOTSUPP;
201}
202
203static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
204 u32 *hw_count)
205{
206 int err;
207
208 err = flow_indr_dev_setup_offload(NULL, NULL, type: TC_SETUP_ACT,
209 data: fl_act, NULL, NULL);
210 if (err < 0)
211 return err;
212
213 if (hw_count)
214 *hw_count = err;
215
216 return 0;
217}
218
219static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
220 u32 *hw_count,
221 flow_indr_block_bind_cb_t *cb,
222 void *cb_priv)
223{
224 int err;
225
226 err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
227 if (err < 0)
228 return err;
229
230 if (hw_count)
231 *hw_count = 1;
232
233 return 0;
234}
235
236static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
237 u32 *hw_count,
238 flow_indr_block_bind_cb_t *cb,
239 void *cb_priv)
240{
241 return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
242 cb, cb_priv) :
243 tcf_action_offload_cmd_ex(fl_act, hw_count);
244}
245
246static int tcf_action_offload_add_ex(struct tc_action *action,
247 struct netlink_ext_ack *extack,
248 flow_indr_block_bind_cb_t *cb,
249 void *cb_priv)
250{
251 bool skip_sw = tc_act_skip_sw(flags: 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(flags: action->tcfa_flags))
260 return 0;
261
262 num = tcf_offload_act_num_actions_single(act: action);
263 fl_action = offload_action_alloc(num_actions: num);
264 if (!fl_action)
265 return -ENOMEM;
266
267 err = offload_action_init(fl_action, act: action, cmd: FLOW_ACT_REPLACE, extack);
268 if (err)
269 goto fl_err;
270
271 err = tc_setup_action(flow_action: &fl_action->action, actions, miss_cookie_base: 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_act: fl_action, hw_count: &in_hw_count, cb, cb_priv);
279 if (!err)
280 cb ? offload_action_hw_count_inc(act: action, hw_count: in_hw_count) :
281 offload_action_hw_count_set(act: action, hw_count: in_hw_count);
282
283 if (skip_sw && !tc_act_in_hw(act: action))
284 err = -EINVAL;
285
286 tc_cleanup_offload_action(flow_action: &fl_action->action);
287
288fl_err:
289 kfree(objp: fl_action);
290
291 return err;
292}
293
294/* offload the tc action after it is inserted */
295static int tcf_action_offload_add(struct tc_action *action,
296 struct netlink_ext_ack *extack)
297{
298 return tcf_action_offload_add_ex(action, extack, NULL, NULL);
299}
300
301int tcf_action_update_hw_stats(struct tc_action *action)
302{
303 struct flow_offload_action fl_act = {};
304 int err;
305
306 err = offload_action_init(fl_action: &fl_act, act: action, cmd: FLOW_ACT_STATS, NULL);
307 if (err)
308 return err;
309
310 err = tcf_action_offload_cmd(fl_act: &fl_act, NULL, NULL, NULL);
311 if (!err) {
312 preempt_disable();
313 tcf_action_stats_update(a: action, bytes: fl_act.stats.bytes,
314 packets: fl_act.stats.pkts,
315 drops: fl_act.stats.drops,
316 lastuse: fl_act.stats.lastused,
317 hw: true);
318 preempt_enable();
319 action->used_hw_stats = fl_act.stats.used_hw_stats;
320 action->used_hw_stats_valid = true;
321 } else {
322 return -EOPNOTSUPP;
323 }
324
325 return 0;
326}
327EXPORT_SYMBOL(tcf_action_update_hw_stats);
328
329static int tcf_action_offload_del_ex(struct tc_action *action,
330 flow_indr_block_bind_cb_t *cb,
331 void *cb_priv)
332{
333 struct flow_offload_action fl_act = {};
334 u32 in_hw_count = 0;
335 int err = 0;
336
337 if (!tc_act_in_hw(act: action))
338 return 0;
339
340 err = offload_action_init(fl_action: &fl_act, act: action, cmd: FLOW_ACT_DESTROY, NULL);
341 if (err)
342 return err;
343
344 err = tcf_action_offload_cmd(fl_act: &fl_act, hw_count: &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(act: action, hw_count: in_hw_count);
354
355 return 0;
356}
357
358static int tcf_action_offload_del(struct tc_action *action)
359{
360 return tcf_action_offload_del_ex(action, NULL, NULL);
361}
362
363static void tcf_action_cleanup(struct tc_action *p)
364{
365 tcf_action_offload_del(action: p);
366 if (p->ops->cleanup)
367 p->ops->cleanup(p);
368
369 gen_kill_estimator(ptr: &p->tcfa_rate_est);
370 free_tcf(p);
371}
372
373static int __tcf_action_put(struct tc_action *p, bool bind)
374{
375 struct tcf_idrinfo *idrinfo = p->idrinfo;
376
377 if (refcount_dec_and_mutex_lock(r: &p->tcfa_refcnt, lock: &idrinfo->lock)) {
378 if (bind)
379 atomic_dec(v: &p->tcfa_bindcnt);
380 idr_remove(&idrinfo->action_idr, id: p->tcfa_index);
381 mutex_unlock(lock: &idrinfo->lock);
382
383 tcf_action_cleanup(p);
384 return 1;
385 }
386
387 if (bind)
388 atomic_dec(v: &p->tcfa_bindcnt);
389
390 return 0;
391}
392
393static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
394{
395 int ret = 0;
396
397 /* Release with strict==1 and bind==0 is only called through act API
398 * interface (classifiers always bind). Only case when action with
399 * positive reference count and zero bind count can exist is when it was
400 * also created with act API (unbinding last classifier will destroy the
401 * action if it was created by classifier). So only case when bind count
402 * can be changed after initial check is when unbound action is
403 * destroyed by act API while classifier binds to action with same id
404 * concurrently. This result either creation of new action(same behavior
405 * as before), or reusing existing action if concurrent process
406 * increments reference count before action is deleted. Both scenarios
407 * are acceptable.
408 */
409 if (p) {
410 if (!bind && strict && atomic_read(v: &p->tcfa_bindcnt) > 0)
411 return -EPERM;
412
413 if (__tcf_action_put(p, bind))
414 ret = ACT_P_DELETED;
415 }
416
417 return ret;
418}
419
420int tcf_idr_release(struct tc_action *a, bool bind)
421{
422 const struct tc_action_ops *ops = a->ops;
423 int ret;
424
425 ret = __tcf_idr_release(p: a, bind, strict: false);
426 if (ret == ACT_P_DELETED)
427 module_put(module: ops->owner);
428 return ret;
429}
430EXPORT_SYMBOL(tcf_idr_release);
431
432static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
433{
434 struct tc_cookie *user_cookie;
435 u32 cookie_len = 0;
436
437 rcu_read_lock();
438 user_cookie = rcu_dereference(act->user_cookie);
439
440 if (user_cookie)
441 cookie_len = nla_total_size(payload: user_cookie->len);
442 rcu_read_unlock();
443
444 return nla_total_size(payload: 0) /* action number nested */
445 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
446 + cookie_len /* TCA_ACT_COOKIE */
447 + nla_total_size(payload: sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
448 + nla_total_size(payload: 0) /* TCA_ACT_STATS nested */
449 + nla_total_size(payload: sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
450 /* TCA_STATS_BASIC */
451 + nla_total_size_64bit(payload: sizeof(struct gnet_stats_basic))
452 /* TCA_STATS_PKT64 */
453 + nla_total_size_64bit(payload: sizeof(u64))
454 /* TCA_STATS_QUEUE */
455 + nla_total_size_64bit(payload: sizeof(struct gnet_stats_queue))
456 + nla_total_size(payload: 0) /* TCA_ACT_OPTIONS nested */
457 + nla_total_size(payload: sizeof(struct tcf_t)); /* TCA_GACT_TM */
458}
459
460static size_t tcf_action_full_attrs_size(size_t sz)
461{
462 return NLMSG_HDRLEN /* struct nlmsghdr */
463 + sizeof(struct tcamsg)
464 + nla_total_size(payload: 0) /* TCA_ACT_TAB nested */
465 + sz;
466}
467
468static size_t tcf_action_fill_size(const struct tc_action *act)
469{
470 size_t sz = tcf_action_shared_attrs_size(act);
471
472 if (act->ops->get_fill_size)
473 return act->ops->get_fill_size(act) + sz;
474 return sz;
475}
476
477static int
478tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
479{
480 unsigned char *b = skb_tail_pointer(skb);
481 struct tc_cookie *cookie;
482
483 if (nla_put_string(skb, attrtype: TCA_ACT_KIND, str: 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, attrtype: TCA_ACT_INDEX, value: 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, attrtype: TCA_ACT_COOKIE, attrlen: cookie->len, data: cookie->data)) {
494 rcu_read_unlock();
495 goto nla_put_failure;
496 }
497 }
498 rcu_read_unlock();
499
500 return 0;
501
502nla_put_failure:
503 nlmsg_trim(skb, mark: b);
504 return -1;
505}
506
507static int
508tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
509{
510 unsigned char *b = skb_tail_pointer(skb);
511 struct nlattr *nest;
512 int err = -EINVAL;
513 u32 flags;
514
515 if (tcf_action_dump_terse(skb, a, from_act: false))
516 goto nla_put_failure;
517
518 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
519 nla_put_bitfield32(skb, attrtype: TCA_ACT_HW_STATS,
520 value: a->hw_stats, TCA_ACT_HW_STATS_ANY))
521 goto nla_put_failure;
522
523 if (a->used_hw_stats_valid &&
524 nla_put_bitfield32(skb, attrtype: TCA_ACT_USED_HW_STATS,
525 value: a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
526 goto nla_put_failure;
527
528 flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
529 if (flags &&
530 nla_put_bitfield32(skb, attrtype: TCA_ACT_FLAGS,
531 value: flags, selector: flags))
532 goto nla_put_failure;
533
534 if (nla_put_u32(skb, attrtype: TCA_ACT_IN_HW_COUNT, value: a->in_hw_count))
535 goto nla_put_failure;
536
537 nest = nla_nest_start_noflag(skb, attrtype: TCA_ACT_OPTIONS);
538 if (nest == NULL)
539 goto nla_put_failure;
540 err = tcf_action_dump_old(skb, a, bind, ref);
541 if (err > 0) {
542 nla_nest_end(skb, start: nest);
543 return err;
544 }
545
546nla_put_failure:
547 nlmsg_trim(skb, mark: b);
548 return -1;
549}
550
551static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
552 struct netlink_callback *cb)
553{
554 int err = 0, index = -1, s_i = 0, n_i = 0;
555 u32 act_flags = cb->args[2];
556 unsigned long jiffy_since = cb->args[3];
557 struct nlattr *nest;
558 struct idr *idr = &idrinfo->action_idr;
559 struct tc_action *p;
560 unsigned long id = 1;
561 unsigned long tmp;
562
563 mutex_lock(lock: &idrinfo->lock);
564
565 s_i = cb->args[0];
566
567 idr_for_each_entry_ul(idr, p, tmp, id) {
568 index++;
569 if (index < s_i)
570 continue;
571 if (IS_ERR(ptr: p))
572 continue;
573
574 if (jiffy_since &&
575 time_after(jiffy_since,
576 (unsigned long)p->tcfa_tm.lastuse))
577 continue;
578
579 tcf_action_update_hw_stats(p);
580
581 nest = nla_nest_start_noflag(skb, attrtype: n_i);
582 if (!nest) {
583 index--;
584 goto nla_put_failure;
585 }
586 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
587 tcf_action_dump_terse(skb, a: p, from_act: true) :
588 tcf_action_dump_1(skb, a: p, bind: 0, ref: 0);
589 if (err < 0) {
590 index--;
591 nlmsg_trim(skb, mark: nest);
592 goto done;
593 }
594 nla_nest_end(skb, start: nest);
595 n_i++;
596 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
597 n_i >= TCA_ACT_MAX_PRIO)
598 goto done;
599 }
600done:
601 if (index >= 0)
602 cb->args[0] = index + 1;
603
604 mutex_unlock(lock: &idrinfo->lock);
605 if (n_i) {
606 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
607 cb->args[1] = n_i;
608 }
609 return n_i;
610
611nla_put_failure:
612 nla_nest_cancel(skb, start: nest);
613 goto done;
614}
615
616static int tcf_idr_release_unsafe(struct tc_action *p)
617{
618 if (atomic_read(v: &p->tcfa_bindcnt) > 0)
619 return -EPERM;
620
621 if (refcount_dec_and_test(r: &p->tcfa_refcnt)) {
622 idr_remove(&p->idrinfo->action_idr, id: p->tcfa_index);
623 tcf_action_cleanup(p);
624 return ACT_P_DELETED;
625 }
626
627 return 0;
628}
629
630static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
631 const struct tc_action_ops *ops,
632 struct netlink_ext_ack *extack)
633{
634 struct nlattr *nest;
635 int n_i = 0;
636 int ret = -EINVAL;
637 struct idr *idr = &idrinfo->action_idr;
638 struct tc_action *p;
639 unsigned long id = 1;
640 unsigned long tmp;
641
642 nest = nla_nest_start_noflag(skb, attrtype: 0);
643 if (nest == NULL)
644 goto nla_put_failure;
645 if (nla_put_string(skb, attrtype: TCA_ACT_KIND, str: ops->kind))
646 goto nla_put_failure;
647
648 ret = 0;
649 mutex_lock(lock: &idrinfo->lock);
650 idr_for_each_entry_ul(idr, p, tmp, id) {
651 if (IS_ERR(ptr: p))
652 continue;
653 ret = tcf_idr_release_unsafe(p);
654 if (ret == ACT_P_DELETED)
655 module_put(module: ops->owner);
656 else if (ret < 0)
657 break;
658 n_i++;
659 }
660 mutex_unlock(lock: &idrinfo->lock);
661 if (ret < 0) {
662 if (n_i)
663 NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
664 else
665 goto nla_put_failure;
666 }
667
668 ret = nla_put_u32(skb, attrtype: TCA_FCNT, value: n_i);
669 if (ret)
670 goto nla_put_failure;
671 nla_nest_end(skb, start: nest);
672
673 return n_i;
674nla_put_failure:
675 nla_nest_cancel(skb, start: nest);
676 return ret;
677}
678
679int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
680 struct netlink_callback *cb, int type,
681 const struct tc_action_ops *ops,
682 struct netlink_ext_ack *extack)
683{
684 struct tcf_idrinfo *idrinfo = tn->idrinfo;
685
686 if (type == RTM_DELACTION) {
687 return tcf_del_walker(idrinfo, skb, ops, extack);
688 } else if (type == RTM_GETACTION) {
689 return tcf_dump_walker(idrinfo, skb, cb);
690 } else {
691 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
692 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
693 return -EINVAL;
694 }
695}
696EXPORT_SYMBOL(tcf_generic_walker);
697
698int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
699{
700 struct tcf_idrinfo *idrinfo = tn->idrinfo;
701 struct tc_action *p;
702
703 mutex_lock(lock: &idrinfo->lock);
704 p = idr_find(&idrinfo->action_idr, id: index);
705 if (IS_ERR(ptr: p))
706 p = NULL;
707 else if (p)
708 refcount_inc(r: &p->tcfa_refcnt);
709 mutex_unlock(lock: &idrinfo->lock);
710
711 if (p) {
712 *a = p;
713 return true;
714 }
715 return false;
716}
717EXPORT_SYMBOL(tcf_idr_search);
718
719static int __tcf_generic_walker(struct net *net, struct sk_buff *skb,
720 struct netlink_callback *cb, int type,
721 const struct tc_action_ops *ops,
722 struct netlink_ext_ack *extack)
723{
724 struct tc_action_net *tn = net_generic(net, id: ops->net_id);
725
726 if (unlikely(ops->walk))
727 return ops->walk(net, skb, cb, type, ops, extack);
728
729 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
730}
731
732static int __tcf_idr_search(struct net *net,
733 const struct tc_action_ops *ops,
734 struct tc_action **a, u32 index)
735{
736 struct tc_action_net *tn = net_generic(net, id: ops->net_id);
737
738 if (unlikely(ops->lookup))
739 return ops->lookup(net, a, index);
740
741 return tcf_idr_search(tn, a, index);
742}
743
744static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
745{
746 struct tc_action *p;
747 int ret = 0;
748
749 mutex_lock(lock: &idrinfo->lock);
750 p = idr_find(&idrinfo->action_idr, id: index);
751 if (!p) {
752 mutex_unlock(lock: &idrinfo->lock);
753 return -ENOENT;
754 }
755
756 if (!atomic_read(v: &p->tcfa_bindcnt)) {
757 if (refcount_dec_and_test(r: &p->tcfa_refcnt)) {
758 struct module *owner = p->ops->owner;
759
760 WARN_ON(p != idr_remove(&idrinfo->action_idr,
761 p->tcfa_index));
762 mutex_unlock(lock: &idrinfo->lock);
763
764 tcf_action_cleanup(p);
765 module_put(module: owner);
766 return 0;
767 }
768 ret = 0;
769 } else {
770 ret = -EPERM;
771 }
772
773 mutex_unlock(lock: &idrinfo->lock);
774 return ret;
775}
776
777int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
778 struct tc_action **a, const struct tc_action_ops *ops,
779 int bind, bool cpustats, u32 flags)
780{
781 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
782 struct tcf_idrinfo *idrinfo = tn->idrinfo;
783 int err = -ENOMEM;
784
785 if (unlikely(!p))
786 return -ENOMEM;
787 refcount_set(r: &p->tcfa_refcnt, n: 1);
788 if (bind)
789 atomic_set(v: &p->tcfa_bindcnt, i: 1);
790
791 if (cpustats) {
792 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
793 if (!p->cpu_bstats)
794 goto err1;
795 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
796 if (!p->cpu_bstats_hw)
797 goto err2;
798 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
799 if (!p->cpu_qstats)
800 goto err3;
801 }
802 gnet_stats_basic_sync_init(b: &p->tcfa_bstats);
803 gnet_stats_basic_sync_init(b: &p->tcfa_bstats_hw);
804 spin_lock_init(&p->tcfa_lock);
805 p->tcfa_index = index;
806 p->tcfa_tm.install = jiffies;
807 p->tcfa_tm.lastuse = jiffies;
808 p->tcfa_tm.firstuse = 0;
809 p->tcfa_flags = flags;
810 if (est) {
811 err = gen_new_estimator(bstats: &p->tcfa_bstats, cpu_bstats: p->cpu_bstats,
812 rate_est: &p->tcfa_rate_est,
813 lock: &p->tcfa_lock, running: false, opt: est);
814 if (err)
815 goto err4;
816 }
817
818 p->idrinfo = idrinfo;
819 __module_get(module: ops->owner);
820 p->ops = ops;
821 *a = p;
822 return 0;
823err4:
824 free_percpu(pdata: p->cpu_qstats);
825err3:
826 free_percpu(pdata: p->cpu_bstats_hw);
827err2:
828 free_percpu(pdata: p->cpu_bstats);
829err1:
830 kfree(objp: p);
831 return err;
832}
833EXPORT_SYMBOL(tcf_idr_create);
834
835int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
836 struct nlattr *est, struct tc_action **a,
837 const struct tc_action_ops *ops, int bind,
838 u32 flags)
839{
840 /* Set cpustats according to actions flags. */
841 return tcf_idr_create(tn, index, est, a, ops, bind,
842 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
843}
844EXPORT_SYMBOL(tcf_idr_create_from_flags);
845
846/* Cleanup idr index that was allocated but not initialized. */
847
848void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
849{
850 struct tcf_idrinfo *idrinfo = tn->idrinfo;
851
852 mutex_lock(lock: &idrinfo->lock);
853 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
854 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
855 mutex_unlock(lock: &idrinfo->lock);
856}
857EXPORT_SYMBOL(tcf_idr_cleanup);
858
859/* Check if action with specified index exists. If actions is found, increments
860 * its reference and bind counters, and return 1. Otherwise insert temporary
861 * error pointer (to prevent concurrent users from inserting actions with same
862 * index) and return 0.
863 *
864 * May return -EAGAIN for binding actions in case of a parallel add/delete on
865 * the requested index.
866 */
867
868int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
869 struct tc_action **a, int bind)
870{
871 struct tcf_idrinfo *idrinfo = tn->idrinfo;
872 struct tc_action *p;
873 int ret;
874 u32 max;
875
876 if (*index) {
877 rcu_read_lock();
878 p = idr_find(&idrinfo->action_idr, id: *index);
879
880 if (IS_ERR(ptr: p)) {
881 /* This means that another process allocated
882 * index but did not assign the pointer yet.
883 */
884 rcu_read_unlock();
885 return -EAGAIN;
886 }
887
888 if (!p) {
889 /* Empty slot, try to allocate it */
890 max = *index;
891 rcu_read_unlock();
892 goto new;
893 }
894
895 if (!refcount_inc_not_zero(r: &p->tcfa_refcnt)) {
896 /* Action was deleted in parallel */
897 rcu_read_unlock();
898 return -EAGAIN;
899 }
900
901 if (bind)
902 atomic_inc(v: &p->tcfa_bindcnt);
903 *a = p;
904
905 rcu_read_unlock();
906
907 return 1;
908 } else {
909 /* Find a slot */
910 *index = 1;
911 max = UINT_MAX;
912 }
913
914new:
915 *a = NULL;
916
917 mutex_lock(lock: &idrinfo->lock);
918 ret = idr_alloc_u32(&idrinfo->action_idr, ptr: ERR_PTR(error: -EBUSY), id: index, max,
919 GFP_KERNEL);
920 mutex_unlock(lock: &idrinfo->lock);
921
922 /* N binds raced for action allocation,
923 * retry for all the ones that failed.
924 */
925 if (ret == -ENOSPC && *index == max)
926 ret = -EAGAIN;
927
928 return ret;
929}
930EXPORT_SYMBOL(tcf_idr_check_alloc);
931
932void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
933 struct tcf_idrinfo *idrinfo)
934{
935 struct idr *idr = &idrinfo->action_idr;
936 bool mutex_taken = false;
937 struct tc_action *p;
938 unsigned long id = 1;
939 unsigned long tmp;
940 int ret;
941
942 idr_for_each_entry_ul(idr, p, tmp, id) {
943 if (tc_act_in_hw(act: p) && !mutex_taken) {
944 rtnl_lock();
945 mutex_taken = true;
946 }
947 ret = __tcf_idr_release(p, bind: false, strict: true);
948 if (ret == ACT_P_DELETED)
949 module_put(module: ops->owner);
950 else if (ret < 0)
951 return;
952 }
953 if (mutex_taken)
954 rtnl_unlock();
955 idr_destroy(&idrinfo->action_idr);
956}
957EXPORT_SYMBOL(tcf_idrinfo_destroy);
958
959static LIST_HEAD(act_base);
960static DEFINE_RWLOCK(act_mod_lock);
961/* since act ops id is stored in pernet subsystem list,
962 * then there is no way to walk through only all the action
963 * subsystem, so we keep tc action pernet ops id for
964 * reoffload to walk through.
965 */
966static LIST_HEAD(act_pernet_id_list);
967static DEFINE_MUTEX(act_id_mutex);
968struct tc_act_pernet_id {
969 struct list_head list;
970 unsigned int id;
971};
972
973static int tcf_pernet_add_id_list(unsigned int id)
974{
975 struct tc_act_pernet_id *id_ptr;
976 int ret = 0;
977
978 mutex_lock(lock: &act_id_mutex);
979 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
980 if (id_ptr->id == id) {
981 ret = -EEXIST;
982 goto err_out;
983 }
984 }
985
986 id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
987 if (!id_ptr) {
988 ret = -ENOMEM;
989 goto err_out;
990 }
991 id_ptr->id = id;
992
993 list_add_tail(new: &id_ptr->list, head: &act_pernet_id_list);
994
995err_out:
996 mutex_unlock(lock: &act_id_mutex);
997 return ret;
998}
999
1000static void tcf_pernet_del_id_list(unsigned int id)
1001{
1002 struct tc_act_pernet_id *id_ptr;
1003
1004 mutex_lock(lock: &act_id_mutex);
1005 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1006 if (id_ptr->id == id) {
1007 list_del(entry: &id_ptr->list);
1008 kfree(objp: id_ptr);
1009 break;
1010 }
1011 }
1012 mutex_unlock(lock: &act_id_mutex);
1013}
1014
1015int tcf_register_action(struct tc_action_ops *act,
1016 struct pernet_operations *ops)
1017{
1018 struct tc_action_ops *a;
1019 int ret;
1020
1021 if (!act->act || !act->dump || !act->init)
1022 return -EINVAL;
1023
1024 /* We have to register pernet ops before making the action ops visible,
1025 * otherwise tcf_action_init_1() could get a partially initialized
1026 * netns.
1027 */
1028 ret = register_pernet_subsys(ops);
1029 if (ret)
1030 return ret;
1031
1032 if (ops->id) {
1033 ret = tcf_pernet_add_id_list(id: *ops->id);
1034 if (ret)
1035 goto err_id;
1036 }
1037
1038 write_lock(&act_mod_lock);
1039 list_for_each_entry(a, &act_base, head) {
1040 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
1041 ret = -EEXIST;
1042 goto err_out;
1043 }
1044 }
1045 list_add_tail(new: &act->head, head: &act_base);
1046 write_unlock(&act_mod_lock);
1047
1048 return 0;
1049
1050err_out:
1051 write_unlock(&act_mod_lock);
1052 if (ops->id)
1053 tcf_pernet_del_id_list(id: *ops->id);
1054err_id:
1055 unregister_pernet_subsys(ops);
1056 return ret;
1057}
1058EXPORT_SYMBOL(tcf_register_action);
1059
1060int tcf_unregister_action(struct tc_action_ops *act,
1061 struct pernet_operations *ops)
1062{
1063 struct tc_action_ops *a;
1064 int err = -ENOENT;
1065
1066 write_lock(&act_mod_lock);
1067 list_for_each_entry(a, &act_base, head) {
1068 if (a == act) {
1069 list_del(entry: &act->head);
1070 err = 0;
1071 break;
1072 }
1073 }
1074 write_unlock(&act_mod_lock);
1075 if (!err) {
1076 unregister_pernet_subsys(ops);
1077 if (ops->id)
1078 tcf_pernet_del_id_list(id: *ops->id);
1079 }
1080 return err;
1081}
1082EXPORT_SYMBOL(tcf_unregister_action);
1083
1084/* lookup by name */
1085static struct tc_action_ops *tc_lookup_action_n(char *kind)
1086{
1087 struct tc_action_ops *a, *res = NULL;
1088
1089 if (kind) {
1090 read_lock(&act_mod_lock);
1091 list_for_each_entry(a, &act_base, head) {
1092 if (strcmp(kind, a->kind) == 0) {
1093 if (try_module_get(module: a->owner))
1094 res = a;
1095 break;
1096 }
1097 }
1098 read_unlock(&act_mod_lock);
1099 }
1100 return res;
1101}
1102
1103/* lookup by nlattr */
1104static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1105{
1106 struct tc_action_ops *a, *res = NULL;
1107
1108 if (kind) {
1109 read_lock(&act_mod_lock);
1110 list_for_each_entry(a, &act_base, head) {
1111 if (nla_strcmp(nla: kind, str: a->kind) == 0) {
1112 if (try_module_get(module: a->owner))
1113 res = a;
1114 break;
1115 }
1116 }
1117 read_unlock(&act_mod_lock);
1118 }
1119 return res;
1120}
1121
1122/*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1123#define TCA_ACT_MAX_PRIO_MASK 0x1FF
1124int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1125 int nr_actions, struct tcf_result *res)
1126{
1127 u32 jmp_prgcnt = 0;
1128 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1129 int i;
1130 int ret = TC_ACT_OK;
1131
1132 if (skb_skip_tc_classify(skb))
1133 return TC_ACT_OK;
1134
1135restart_act_graph:
1136 for (i = 0; i < nr_actions; i++) {
1137 const struct tc_action *a = actions[i];
1138 int repeat_ttl;
1139
1140 if (jmp_prgcnt > 0) {
1141 jmp_prgcnt -= 1;
1142 continue;
1143 }
1144
1145 if (tc_act_skip_sw(flags: a->tcfa_flags))
1146 continue;
1147
1148 repeat_ttl = 32;
1149repeat:
1150 ret = tc_act(skb, a, res);
1151 if (unlikely(ret == TC_ACT_REPEAT)) {
1152 if (--repeat_ttl != 0)
1153 goto repeat;
1154 /* suspicious opcode, stop pipeline */
1155 net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1156 return TC_ACT_OK;
1157 }
1158 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1159 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1160 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1161 /* faulty opcode, stop pipeline */
1162 return TC_ACT_OK;
1163 } else {
1164 jmp_ttl -= 1;
1165 if (jmp_ttl > 0)
1166 goto restart_act_graph;
1167 else /* faulty graph, stop pipeline */
1168 return TC_ACT_OK;
1169 }
1170 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1171 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1172 tcf_set_drop_reason(skb,
1173 reason: SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
1174 return TC_ACT_SHOT;
1175 }
1176 tcf_action_goto_chain_exec(a, res);
1177 }
1178
1179 if (ret != TC_ACT_PIPE)
1180 break;
1181 }
1182
1183 return ret;
1184}
1185EXPORT_SYMBOL(tcf_action_exec);
1186
1187int tcf_action_destroy(struct tc_action *actions[], int bind)
1188{
1189 const struct tc_action_ops *ops;
1190 struct tc_action *a;
1191 int ret = 0, i;
1192
1193 tcf_act_for_each_action(i, a, actions) {
1194 actions[i] = NULL;
1195 ops = a->ops;
1196 ret = __tcf_idr_release(p: a, bind, strict: true);
1197 if (ret == ACT_P_DELETED)
1198 module_put(module: ops->owner);
1199 else if (ret < 0)
1200 return ret;
1201 }
1202 return ret;
1203}
1204
1205static int tcf_action_put(struct tc_action *p)
1206{
1207 return __tcf_action_put(p, bind: false);
1208}
1209
1210static void tcf_action_put_many(struct tc_action *actions[])
1211{
1212 struct tc_action *a;
1213 int i;
1214
1215 tcf_act_for_each_action(i, a, actions) {
1216 const struct tc_action_ops *ops = a->ops;
1217 if (tcf_action_put(p: a))
1218 module_put(module: ops->owner);
1219 }
1220}
1221
1222static void tca_put_bound_many(struct tc_action *actions[], int init_res[])
1223{
1224 struct tc_action *a;
1225 int i;
1226
1227 tcf_act_for_each_action(i, a, actions) {
1228 const struct tc_action_ops *ops = a->ops;
1229
1230 if (init_res[i] == ACT_P_CREATED)
1231 continue;
1232
1233 if (tcf_action_put(p: a))
1234 module_put(module: ops->owner);
1235 }
1236}
1237
1238int
1239tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1240{
1241 return a->ops->dump(skb, a, bind, ref);
1242}
1243
1244int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1245 int bind, int ref, bool terse)
1246{
1247 struct tc_action *a;
1248 int err = -EINVAL, i;
1249 struct nlattr *nest;
1250
1251 tcf_act_for_each_action(i, a, actions) {
1252 nest = nla_nest_start_noflag(skb, attrtype: i + 1);
1253 if (nest == NULL)
1254 goto nla_put_failure;
1255 err = terse ? tcf_action_dump_terse(skb, a, from_act: false) :
1256 tcf_action_dump_1(skb, a, bind, ref);
1257 if (err < 0)
1258 goto errout;
1259 nla_nest_end(skb, start: nest);
1260 }
1261
1262 return 0;
1263
1264nla_put_failure:
1265 err = -EINVAL;
1266errout:
1267 nla_nest_cancel(skb, start: nest);
1268 return err;
1269}
1270
1271static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1272{
1273 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1274 if (!c)
1275 return NULL;
1276
1277 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1278 if (!c->data) {
1279 kfree(objp: c);
1280 return NULL;
1281 }
1282 c->len = nla_len(nla: tb[TCA_ACT_COOKIE]);
1283
1284 return c;
1285}
1286
1287static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1288{
1289 struct nla_bitfield32 hw_stats_bf;
1290
1291 /* If the user did not pass the attr, that means he does
1292 * not care about the type. Return "any" in that case
1293 * which is setting on all supported types.
1294 */
1295 if (!hw_stats_attr)
1296 return TCA_ACT_HW_STATS_ANY;
1297 hw_stats_bf = nla_get_bitfield32(nla: hw_stats_attr);
1298 return hw_stats_bf.value;
1299}
1300
1301static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1302 [TCA_ACT_KIND] = { .type = NLA_STRING },
1303 [TCA_ACT_INDEX] = { .type = NLA_U32 },
1304 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
1305 .len = TC_COOKIE_MAX_SIZE },
1306 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
1307 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1308 TCA_ACT_FLAGS_SKIP_HW |
1309 TCA_ACT_FLAGS_SKIP_SW),
1310 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1311};
1312
1313void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
1314{
1315 struct tc_action *a;
1316 int i;
1317
1318 tcf_act_for_each_action(i, a, actions) {
1319 struct tcf_idrinfo *idrinfo;
1320
1321 if (init_res[i] == ACT_P_BOUND)
1322 continue;
1323
1324 idrinfo = a->idrinfo;
1325 mutex_lock(lock: &idrinfo->lock);
1326 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
1327 idr_replace(&idrinfo->action_idr, a, id: a->tcfa_index);
1328 mutex_unlock(lock: &idrinfo->lock);
1329 }
1330}
1331
1332struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
1333 struct netlink_ext_ack *extack)
1334{
1335 bool police = flags & TCA_ACT_FLAGS_POLICE;
1336 struct nlattr *tb[TCA_ACT_MAX + 1];
1337 struct tc_action_ops *a_o;
1338 char act_name[IFNAMSIZ];
1339 struct nlattr *kind;
1340 int err;
1341
1342 if (!police) {
1343 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1344 policy: tcf_action_policy, extack);
1345 if (err < 0)
1346 return ERR_PTR(error: err);
1347 err = -EINVAL;
1348 kind = tb[TCA_ACT_KIND];
1349 if (!kind) {
1350 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1351 return ERR_PTR(error: err);
1352 }
1353 if (nla_strscpy(dst: act_name, nla: kind, IFNAMSIZ) < 0) {
1354 NL_SET_ERR_MSG(extack, "TC action name too long");
1355 return ERR_PTR(error: err);
1356 }
1357 } else {
1358 if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
1359 NL_SET_ERR_MSG(extack, "TC action name too long");
1360 return ERR_PTR(error: -EINVAL);
1361 }
1362 }
1363
1364 a_o = tc_lookup_action_n(kind: act_name);
1365 if (a_o == NULL) {
1366#ifdef CONFIG_MODULES
1367 bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL);
1368
1369 if (rtnl_held)
1370 rtnl_unlock();
1371 request_module(NET_ACT_ALIAS_PREFIX "%s", act_name);
1372 if (rtnl_held)
1373 rtnl_lock();
1374
1375 a_o = tc_lookup_action_n(kind: act_name);
1376
1377 /* We dropped the RTNL semaphore in order to
1378 * perform the module load. So, even if we
1379 * succeeded in loading the module we have to
1380 * tell the caller to replay the request. We
1381 * indicate this using -EAGAIN.
1382 */
1383 if (a_o != NULL) {
1384 module_put(module: a_o->owner);
1385 return ERR_PTR(error: -EAGAIN);
1386 }
1387#endif
1388 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1389 return ERR_PTR(error: -ENOENT);
1390 }
1391
1392 return a_o;
1393}
1394
1395struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1396 struct nlattr *nla, struct nlattr *est,
1397 struct tc_action_ops *a_o, int *init_res,
1398 u32 flags, struct netlink_ext_ack *extack)
1399{
1400 bool police = flags & TCA_ACT_FLAGS_POLICE;
1401 struct nla_bitfield32 userflags = { 0, 0 };
1402 struct tc_cookie *user_cookie = NULL;
1403 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1404 struct nlattr *tb[TCA_ACT_MAX + 1];
1405 struct tc_action *a;
1406 int err;
1407
1408 /* backward compatibility for policer */
1409 if (!police) {
1410 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1411 policy: tcf_action_policy, extack);
1412 if (err < 0)
1413 return ERR_PTR(error: err);
1414 if (tb[TCA_ACT_COOKIE]) {
1415 user_cookie = nla_memdup_cookie(tb);
1416 if (!user_cookie) {
1417 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1418 err = -ENOMEM;
1419 goto err_out;
1420 }
1421 }
1422 hw_stats = tcf_action_hw_stats_get(hw_stats_attr: tb[TCA_ACT_HW_STATS]);
1423 if (tb[TCA_ACT_FLAGS]) {
1424 userflags = nla_get_bitfield32(nla: tb[TCA_ACT_FLAGS]);
1425 if (!tc_act_flags_valid(flags: userflags.value)) {
1426 err = -EINVAL;
1427 goto err_out;
1428 }
1429 }
1430
1431 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1432 userflags.value | flags, extack);
1433 } else {
1434 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1435 extack);
1436 }
1437 if (err < 0)
1438 goto err_out;
1439 *init_res = err;
1440
1441 if (!police && tb[TCA_ACT_COOKIE])
1442 tcf_set_action_cookie(old_cookie: &a->user_cookie, new_cookie: user_cookie);
1443
1444 if (!police)
1445 a->hw_stats = hw_stats;
1446
1447 return a;
1448
1449err_out:
1450 if (user_cookie) {
1451 kfree(objp: user_cookie->data);
1452 kfree(objp: user_cookie);
1453 }
1454 return ERR_PTR(error: err);
1455}
1456
1457static bool tc_act_bind(u32 flags)
1458{
1459 return !!(flags & TCA_ACT_FLAGS_BIND);
1460}
1461
1462/* Returns numbers of initialized actions or negative error. */
1463
1464int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1465 struct nlattr *est, struct tc_action *actions[],
1466 int init_res[], size_t *attr_size,
1467 u32 flags, u32 fl_flags,
1468 struct netlink_ext_ack *extack)
1469{
1470 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1471 struct nlattr *tb[TCA_ACT_MAX_PRIO + 2];
1472 struct tc_action *act;
1473 size_t sz = 0;
1474 int err;
1475 int i;
1476
1477 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO + 1, nla, NULL,
1478 extack);
1479 if (err < 0)
1480 return err;
1481
1482 /* The nested attributes are parsed as types, but they are really an
1483 * array of actions. So we parse one more than we can handle, and return
1484 * an error if the last one is set (as that indicates that the request
1485 * contained more than the maximum number of actions).
1486 */
1487 if (tb[TCA_ACT_MAX_PRIO + 1]) {
1488 NL_SET_ERR_MSG_FMT(extack,
1489 "Only %d actions supported per filter",
1490 TCA_ACT_MAX_PRIO);
1491 return -EINVAL;
1492 }
1493
1494 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1495 struct tc_action_ops *a_o;
1496
1497 a_o = tc_action_load_ops(nla: tb[i], flags, extack);
1498 if (IS_ERR(ptr: a_o)) {
1499 err = PTR_ERR(ptr: a_o);
1500 goto err_mod;
1501 }
1502 ops[i - 1] = a_o;
1503 }
1504
1505 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1506 act = tcf_action_init_1(net, tp, nla: tb[i], est, a_o: ops[i - 1],
1507 init_res: &init_res[i - 1], flags, extack);
1508 if (IS_ERR(ptr: act)) {
1509 err = PTR_ERR(ptr: act);
1510 goto err;
1511 }
1512 sz += tcf_action_fill_size(act);
1513 /* Start from index 0 */
1514 actions[i - 1] = act;
1515 if (tc_act_bind(flags)) {
1516 bool skip_sw = tc_skip_sw(flags: fl_flags);
1517 bool skip_hw = tc_skip_hw(flags: fl_flags);
1518
1519 if (tc_act_bind(flags: act->tcfa_flags)) {
1520 /* Action is created by classifier and is not
1521 * standalone. Check that the user did not set
1522 * any action flags different than the
1523 * classifier flags, and inherit the flags from
1524 * the classifier for the compatibility case
1525 * where no flags were specified at all.
1526 */
1527 if ((tc_act_skip_sw(flags: act->tcfa_flags) && !skip_sw) ||
1528 (tc_act_skip_hw(flags: act->tcfa_flags) && !skip_hw)) {
1529 NL_SET_ERR_MSG(extack,
1530 "Mismatch between action and filter offload flags");
1531 err = -EINVAL;
1532 goto err;
1533 }
1534 if (skip_sw)
1535 act->tcfa_flags |= TCA_ACT_FLAGS_SKIP_SW;
1536 if (skip_hw)
1537 act->tcfa_flags |= TCA_ACT_FLAGS_SKIP_HW;
1538 continue;
1539 }
1540
1541 /* Action is standalone */
1542 if (skip_sw != tc_act_skip_sw(flags: act->tcfa_flags) ||
1543 skip_hw != tc_act_skip_hw(flags: act->tcfa_flags)) {
1544 NL_SET_ERR_MSG(extack,
1545 "Mismatch between action and filter offload flags");
1546 err = -EINVAL;
1547 goto err;
1548 }
1549 } else {
1550 err = tcf_action_offload_add(action: act, extack);
1551 if (tc_act_skip_sw(flags: act->tcfa_flags) && err)
1552 goto err;
1553 }
1554 }
1555
1556 /* We have to commit them all together, because if any error happened in
1557 * between, we could not handle the failure gracefully.
1558 */
1559 tcf_idr_insert_many(actions, init_res);
1560
1561 *attr_size = tcf_action_full_attrs_size(sz);
1562 err = i - 1;
1563 goto err_mod;
1564
1565err:
1566 tcf_action_destroy(actions, bind: flags & TCA_ACT_FLAGS_BIND);
1567err_mod:
1568 for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++)
1569 module_put(module: ops[i]->owner);
1570 return err;
1571}
1572
1573void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1574 u64 drops, bool hw)
1575{
1576 if (a->cpu_bstats) {
1577 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1578
1579 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1580
1581 if (hw)
1582 _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1583 bytes, packets);
1584 return;
1585 }
1586
1587 _bstats_update(bstats: &a->tcfa_bstats, bytes, packets);
1588 atomic_add(i: drops, v: &a->tcfa_drops);
1589 if (hw)
1590 _bstats_update(bstats: &a->tcfa_bstats_hw, bytes, packets);
1591}
1592EXPORT_SYMBOL(tcf_action_update_stats);
1593
1594int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1595 int compat_mode)
1596{
1597 struct gnet_stats_queue qstats = {0};
1598 struct gnet_dump d;
1599 int err = 0;
1600
1601 if (p == NULL)
1602 goto errout;
1603
1604 /* compat_mode being true specifies a call that is supposed
1605 * to add additional backward compatibility statistic TLVs.
1606 */
1607 if (compat_mode) {
1608 if (p->type == TCA_OLD_COMPAT)
1609 err = gnet_stats_start_copy_compat(skb, type: 0,
1610 tc_stats_type: TCA_STATS,
1611 xstats_type: TCA_XSTATS,
1612 lock: &p->tcfa_lock, d: &d,
1613 padattr: TCA_PAD);
1614 else
1615 return 0;
1616 } else
1617 err = gnet_stats_start_copy(skb, type: TCA_ACT_STATS,
1618 lock: &p->tcfa_lock, d: &d, padattr: TCA_ACT_PAD);
1619
1620 if (err < 0)
1621 goto errout;
1622
1623 qstats.drops = atomic_read(v: &p->tcfa_drops);
1624 qstats.overlimits = atomic_read(v: &p->tcfa_overlimits);
1625
1626 if (gnet_stats_copy_basic(d: &d, cpu: p->cpu_bstats,
1627 b: &p->tcfa_bstats, running: false) < 0 ||
1628 gnet_stats_copy_basic_hw(d: &d, cpu: p->cpu_bstats_hw,
1629 b: &p->tcfa_bstats_hw, running: false) < 0 ||
1630 gnet_stats_copy_rate_est(d: &d, ptr: &p->tcfa_rate_est) < 0 ||
1631 gnet_stats_copy_queue(d: &d, cpu_q: p->cpu_qstats,
1632 q: &qstats,
1633 qlen: qstats.qlen) < 0)
1634 goto errout;
1635
1636 if (gnet_stats_finish_copy(d: &d) < 0)
1637 goto errout;
1638
1639 return 0;
1640
1641errout:
1642 return -1;
1643}
1644
1645static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1646 u32 portid, u32 seq, u16 flags, int event, int bind,
1647 int ref, struct netlink_ext_ack *extack)
1648{
1649 struct tcamsg *t;
1650 struct nlmsghdr *nlh;
1651 unsigned char *b = skb_tail_pointer(skb);
1652 struct nlattr *nest;
1653
1654 nlh = nlmsg_put(skb, portid, seq, type: event, payload: sizeof(*t), flags);
1655 if (!nlh)
1656 goto out_nlmsg_trim;
1657 t = nlmsg_data(nlh);
1658 t->tca_family = AF_UNSPEC;
1659 t->tca__pad1 = 0;
1660 t->tca__pad2 = 0;
1661
1662 if (extack && extack->_msg &&
1663 nla_put_string(skb, attrtype: TCA_ROOT_EXT_WARN_MSG, str: extack->_msg))
1664 goto out_nlmsg_trim;
1665
1666 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1667 if (!nest)
1668 goto out_nlmsg_trim;
1669
1670 if (tcf_action_dump(skb, actions, bind, ref, terse: false) < 0)
1671 goto out_nlmsg_trim;
1672
1673 nla_nest_end(skb, start: nest);
1674
1675 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1676
1677 return skb->len;
1678
1679out_nlmsg_trim:
1680 nlmsg_trim(skb, mark: b);
1681 return -1;
1682}
1683
1684static int
1685tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1686 struct tc_action *actions[], int event,
1687 struct netlink_ext_ack *extack)
1688{
1689 struct sk_buff *skb;
1690
1691 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1692 if (!skb)
1693 return -ENOBUFS;
1694 if (tca_get_fill(skb, actions, portid, seq: n->nlmsg_seq, flags: 0, event,
1695 bind: 0, ref: 1, NULL) <= 0) {
1696 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1697 kfree_skb(skb);
1698 return -EINVAL;
1699 }
1700
1701 return rtnl_unicast(skb, net, pid: portid);
1702}
1703
1704static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1705 struct nlmsghdr *n, u32 portid,
1706 struct netlink_ext_ack *extack)
1707{
1708 struct nlattr *tb[TCA_ACT_MAX + 1];
1709 const struct tc_action_ops *ops;
1710 struct tc_action *a;
1711 int index;
1712 int err;
1713
1714 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1715 policy: tcf_action_policy, extack);
1716 if (err < 0)
1717 goto err_out;
1718
1719 err = -EINVAL;
1720 if (tb[TCA_ACT_INDEX] == NULL ||
1721 nla_len(nla: tb[TCA_ACT_INDEX]) < sizeof(index)) {
1722 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1723 goto err_out;
1724 }
1725 index = nla_get_u32(nla: tb[TCA_ACT_INDEX]);
1726
1727 err = -EINVAL;
1728 ops = tc_lookup_action(kind: tb[TCA_ACT_KIND]);
1729 if (!ops) { /* could happen in batch of actions */
1730 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1731 goto err_out;
1732 }
1733 err = -ENOENT;
1734 if (__tcf_idr_search(net, ops, a: &a, index) == 0) {
1735 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1736 goto err_mod;
1737 }
1738
1739 module_put(module: ops->owner);
1740 return a;
1741
1742err_mod:
1743 module_put(module: ops->owner);
1744err_out:
1745 return ERR_PTR(error: err);
1746}
1747
1748static int tca_action_flush(struct net *net, struct nlattr *nla,
1749 struct nlmsghdr *n, u32 portid,
1750 struct netlink_ext_ack *extack)
1751{
1752 struct sk_buff *skb;
1753 unsigned char *b;
1754 struct nlmsghdr *nlh;
1755 struct tcamsg *t;
1756 struct netlink_callback dcb;
1757 struct nlattr *nest;
1758 struct nlattr *tb[TCA_ACT_MAX + 1];
1759 const struct tc_action_ops *ops;
1760 struct nlattr *kind;
1761 int err = -ENOMEM;
1762
1763 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1764 if (!skb)
1765 return err;
1766
1767 b = skb_tail_pointer(skb);
1768
1769 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1770 policy: tcf_action_policy, extack);
1771 if (err < 0)
1772 goto err_out;
1773
1774 err = -EINVAL;
1775 kind = tb[TCA_ACT_KIND];
1776 ops = tc_lookup_action(kind);
1777 if (!ops) { /*some idjot trying to flush unknown action */
1778 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1779 goto err_out;
1780 }
1781
1782 nlh = nlmsg_put(skb, portid, seq: n->nlmsg_seq, RTM_DELACTION,
1783 payload: sizeof(*t), flags: 0);
1784 if (!nlh) {
1785 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1786 goto out_module_put;
1787 }
1788 t = nlmsg_data(nlh);
1789 t->tca_family = AF_UNSPEC;
1790 t->tca__pad1 = 0;
1791 t->tca__pad2 = 0;
1792
1793 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1794 if (!nest) {
1795 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1796 goto out_module_put;
1797 }
1798
1799 err = __tcf_generic_walker(net, skb, cb: &dcb, RTM_DELACTION, ops, extack);
1800 if (err <= 0) {
1801 nla_nest_cancel(skb, start: nest);
1802 goto out_module_put;
1803 }
1804
1805 nla_nest_end(skb, start: nest);
1806
1807 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1808 nlh->nlmsg_flags |= NLM_F_ROOT;
1809 module_put(module: ops->owner);
1810 err = rtnetlink_send(skb, net, pid: portid, RTNLGRP_TC,
1811 echo: n->nlmsg_flags & NLM_F_ECHO);
1812 if (err < 0)
1813 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1814
1815 return err;
1816
1817out_module_put:
1818 module_put(module: ops->owner);
1819err_out:
1820 kfree_skb(skb);
1821 return err;
1822}
1823
1824static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1825{
1826 struct tc_action *a;
1827 int i;
1828
1829 tcf_act_for_each_action(i, a, actions) {
1830 const struct tc_action_ops *ops = a->ops;
1831 /* Actions can be deleted concurrently so we must save their
1832 * type and id to search again after reference is released.
1833 */
1834 struct tcf_idrinfo *idrinfo = a->idrinfo;
1835 u32 act_index = a->tcfa_index;
1836
1837 actions[i] = NULL;
1838 if (tcf_action_put(p: a)) {
1839 /* last reference, action was deleted concurrently */
1840 module_put(module: ops->owner);
1841 } else {
1842 int ret;
1843
1844 /* now do the delete */
1845 ret = tcf_idr_delete_index(idrinfo, index: act_index);
1846 if (ret < 0)
1847 return ret;
1848 }
1849 }
1850 return 0;
1851}
1852
1853static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net,
1854 struct tc_action *action)
1855{
1856 size_t attr_size = tcf_action_fill_size(act: action);
1857 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1858 [0] = action,
1859 };
1860 struct sk_buff *skb;
1861
1862 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1863 if (!skb)
1864 return ERR_PTR(error: -ENOBUFS);
1865
1866 if (tca_get_fill(skb, actions, portid: 0, seq: 0, flags: 0, RTM_DELACTION, bind: 0, ref: 1, NULL) <= 0) {
1867 kfree_skb(skb);
1868 return ERR_PTR(error: -EINVAL);
1869 }
1870
1871 return skb;
1872}
1873
1874static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1875{
1876 const struct tc_action_ops *ops = action->ops;
1877 struct sk_buff *skb;
1878 int ret;
1879
1880 if (!rtnl_notify_needed(net, nlflags: 0, RTNLGRP_TC)) {
1881 skb = NULL;
1882 } else {
1883 skb = tcf_reoffload_del_notify_msg(net, action);
1884 if (IS_ERR(ptr: skb))
1885 return PTR_ERR(ptr: skb);
1886 }
1887
1888 ret = tcf_idr_release_unsafe(p: action);
1889 if (ret == ACT_P_DELETED) {
1890 module_put(module: ops->owner);
1891 ret = rtnetlink_maybe_send(skb, net, pid: 0, RTNLGRP_TC, echo: 0);
1892 } else {
1893 kfree_skb(skb);
1894 }
1895
1896 return ret;
1897}
1898
1899int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1900 void *cb_priv, bool add)
1901{
1902 struct tc_act_pernet_id *id_ptr;
1903 struct tcf_idrinfo *idrinfo;
1904 struct tc_action_net *tn;
1905 struct tc_action *p;
1906 unsigned int act_id;
1907 unsigned long tmp;
1908 unsigned long id;
1909 struct idr *idr;
1910 struct net *net;
1911 int ret;
1912
1913 if (!cb)
1914 return -EINVAL;
1915
1916 down_read(sem: &net_rwsem);
1917 mutex_lock(lock: &act_id_mutex);
1918
1919 for_each_net(net) {
1920 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1921 act_id = id_ptr->id;
1922 tn = net_generic(net, id: act_id);
1923 if (!tn)
1924 continue;
1925 idrinfo = tn->idrinfo;
1926 if (!idrinfo)
1927 continue;
1928
1929 mutex_lock(lock: &idrinfo->lock);
1930 idr = &idrinfo->action_idr;
1931 idr_for_each_entry_ul(idr, p, tmp, id) {
1932 if (IS_ERR(ptr: p) || tc_act_bind(flags: p->tcfa_flags))
1933 continue;
1934 if (add) {
1935 tcf_action_offload_add_ex(action: p, NULL, cb,
1936 cb_priv);
1937 continue;
1938 }
1939
1940 /* cb unregister to update hw count */
1941 ret = tcf_action_offload_del_ex(action: p, cb, cb_priv);
1942 if (ret < 0)
1943 continue;
1944 if (tc_act_skip_sw(flags: p->tcfa_flags) &&
1945 !tc_act_in_hw(act: p))
1946 tcf_reoffload_del_notify(net, action: p);
1947 }
1948 mutex_unlock(lock: &idrinfo->lock);
1949 }
1950 }
1951 mutex_unlock(lock: &act_id_mutex);
1952 up_read(sem: &net_rwsem);
1953
1954 return 0;
1955}
1956
1957static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n,
1958 struct tc_action *actions[],
1959 u32 portid, size_t attr_size,
1960 struct netlink_ext_ack *extack)
1961{
1962 struct sk_buff *skb;
1963
1964 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1965 if (!skb)
1966 return ERR_PTR(error: -ENOBUFS);
1967
1968 if (tca_get_fill(skb, actions, portid, seq: n->nlmsg_seq, flags: 0, RTM_DELACTION,
1969 bind: 0, ref: 2, extack) <= 0) {
1970 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1971 kfree_skb(skb);
1972 return ERR_PTR(error: -EINVAL);
1973 }
1974
1975 return skb;
1976}
1977
1978static int tcf_del_notify(struct net *net, struct nlmsghdr *n,
1979 struct tc_action *actions[], u32 portid,
1980 size_t attr_size, struct netlink_ext_ack *extack)
1981{
1982 struct sk_buff *skb;
1983 int ret;
1984
1985 if (!rtnl_notify_needed(net, nlflags: n->nlmsg_flags, RTNLGRP_TC)) {
1986 skb = NULL;
1987 } else {
1988 skb = tcf_del_notify_msg(net, n, actions, portid, attr_size,
1989 extack);
1990 if (IS_ERR(ptr: skb))
1991 return PTR_ERR(ptr: skb);
1992 }
1993
1994 /* now do the delete */
1995 ret = tcf_action_delete(net, actions);
1996 if (ret < 0) {
1997 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1998 kfree_skb(skb);
1999 return ret;
2000 }
2001
2002 return rtnetlink_maybe_send(skb, net, pid: portid, RTNLGRP_TC,
2003 echo: n->nlmsg_flags & NLM_F_ECHO);
2004}
2005
2006static int
2007tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
2008 u32 portid, int event, struct netlink_ext_ack *extack)
2009{
2010 int i, ret;
2011 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2012 struct tc_action *act;
2013 size_t attr_size = 0;
2014 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
2015
2016 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
2017 extack);
2018 if (ret < 0)
2019 return ret;
2020
2021 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
2022 if (tb[1])
2023 return tca_action_flush(net, nla: tb[1], n, portid, extack);
2024
2025 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
2026 return -EINVAL;
2027 }
2028
2029 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
2030 act = tcf_action_get_1(net, nla: tb[i], n, portid, extack);
2031 if (IS_ERR(ptr: act)) {
2032 ret = PTR_ERR(ptr: act);
2033 goto err;
2034 }
2035 attr_size += tcf_action_fill_size(act);
2036 actions[i - 1] = act;
2037 }
2038
2039 attr_size = tcf_action_full_attrs_size(sz: attr_size);
2040
2041 if (event == RTM_GETACTION)
2042 ret = tcf_get_notify(net, portid, n, actions, event, extack);
2043 else { /* delete */
2044 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
2045 if (ret)
2046 goto err;
2047 return 0;
2048 }
2049err:
2050 tcf_action_put_many(actions);
2051 return ret;
2052}
2053
2054static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n,
2055 struct tc_action *actions[],
2056 u32 portid, size_t attr_size,
2057 struct netlink_ext_ack *extack)
2058{
2059 struct sk_buff *skb;
2060
2061 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
2062 if (!skb)
2063 return ERR_PTR(error: -ENOBUFS);
2064
2065 if (tca_get_fill(skb, actions, portid, seq: n->nlmsg_seq, flags: n->nlmsg_flags,
2066 RTM_NEWACTION, bind: 0, ref: 0, extack) <= 0) {
2067 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
2068 kfree_skb(skb);
2069 return ERR_PTR(error: -EINVAL);
2070 }
2071
2072 return skb;
2073}
2074
2075static int tcf_add_notify(struct net *net, struct nlmsghdr *n,
2076 struct tc_action *actions[], u32 portid,
2077 size_t attr_size, struct netlink_ext_ack *extack)
2078{
2079 struct sk_buff *skb;
2080
2081 if (!rtnl_notify_needed(net, nlflags: n->nlmsg_flags, RTNLGRP_TC)) {
2082 skb = NULL;
2083 } else {
2084 skb = tcf_add_notify_msg(net, n, actions, portid, attr_size,
2085 extack);
2086 if (IS_ERR(ptr: skb))
2087 return PTR_ERR(ptr: skb);
2088 }
2089
2090 return rtnetlink_maybe_send(skb, net, pid: portid, RTNLGRP_TC,
2091 echo: n->nlmsg_flags & NLM_F_ECHO);
2092}
2093
2094static int tcf_action_add(struct net *net, struct nlattr *nla,
2095 struct nlmsghdr *n, u32 portid, u32 flags,
2096 struct netlink_ext_ack *extack)
2097{
2098 size_t attr_size = 0;
2099 int loop, ret;
2100 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
2101 int init_res[TCA_ACT_MAX_PRIO] = {};
2102
2103 for (loop = 0; loop < 10; loop++) {
2104 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
2105 attr_size: &attr_size, flags, fl_flags: 0, extack);
2106 if (ret != -EAGAIN)
2107 break;
2108 }
2109
2110 if (ret < 0)
2111 return ret;
2112
2113 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
2114
2115 /* only put bound actions */
2116 tca_put_bound_many(actions, init_res);
2117
2118 return ret;
2119}
2120
2121static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
2122 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2123 TCA_ACT_FLAG_TERSE_DUMP),
2124 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
2125};
2126
2127static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2128 struct netlink_ext_ack *extack)
2129{
2130 struct net *net = sock_net(sk: skb->sk);
2131 struct nlattr *tca[TCA_ROOT_MAX + 1];
2132 u32 portid = NETLINK_CB(skb).portid;
2133 u32 flags = 0;
2134 int ret = 0;
2135
2136 if ((n->nlmsg_type != RTM_GETACTION) &&
2137 !netlink_capable(skb, CAP_NET_ADMIN))
2138 return -EPERM;
2139
2140 ret = nlmsg_parse_deprecated(nlh: n, hdrlen: sizeof(struct tcamsg), tb: tca,
2141 TCA_ROOT_MAX, NULL, extack);
2142 if (ret < 0)
2143 return ret;
2144
2145 if (tca[TCA_ACT_TAB] == NULL) {
2146 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2147 return -EINVAL;
2148 }
2149
2150 /* n->nlmsg_flags & NLM_F_CREATE */
2151 switch (n->nlmsg_type) {
2152 case RTM_NEWACTION:
2153 /* we are going to assume all other flags
2154 * imply create only if it doesn't exist
2155 * Note that CREATE | EXCL implies that
2156 * but since we want avoid ambiguity (eg when flags
2157 * is zero) then just set this
2158 */
2159 if (n->nlmsg_flags & NLM_F_REPLACE)
2160 flags = TCA_ACT_FLAGS_REPLACE;
2161 ret = tcf_action_add(net, nla: tca[TCA_ACT_TAB], n, portid, flags,
2162 extack);
2163 break;
2164 case RTM_DELACTION:
2165 ret = tca_action_gd(net, nla: tca[TCA_ACT_TAB], n,
2166 portid, RTM_DELACTION, extack);
2167 break;
2168 case RTM_GETACTION:
2169 ret = tca_action_gd(net, nla: tca[TCA_ACT_TAB], n,
2170 portid, RTM_GETACTION, extack);
2171 break;
2172 default:
2173 BUG();
2174 }
2175
2176 return ret;
2177}
2178
2179static struct nlattr *find_dump_kind(struct nlattr **nla)
2180{
2181 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2182 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2183 struct nlattr *kind;
2184
2185 tb1 = nla[TCA_ACT_TAB];
2186 if (tb1 == NULL)
2187 return NULL;
2188
2189 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, head: nla_data(nla: tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2190 return NULL;
2191
2192 if (tb[1] == NULL)
2193 return NULL;
2194 if (nla_parse_nested_deprecated(tb: tb2, TCA_ACT_MAX, nla: tb[1], policy: tcf_action_policy, NULL) < 0)
2195 return NULL;
2196 kind = tb2[TCA_ACT_KIND];
2197
2198 return kind;
2199}
2200
2201static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2202{
2203 struct net *net = sock_net(sk: skb->sk);
2204 struct nlmsghdr *nlh;
2205 unsigned char *b = skb_tail_pointer(skb);
2206 struct nlattr *nest;
2207 struct tc_action_ops *a_o;
2208 int ret = 0;
2209 struct tcamsg *t = (struct tcamsg *) nlmsg_data(nlh: cb->nlh);
2210 struct nlattr *tb[TCA_ROOT_MAX + 1];
2211 struct nlattr *count_attr = NULL;
2212 unsigned long jiffy_since = 0;
2213 struct nlattr *kind = NULL;
2214 struct nla_bitfield32 bf;
2215 u32 msecs_since = 0;
2216 u32 act_count = 0;
2217
2218 ret = nlmsg_parse_deprecated(nlh: cb->nlh, hdrlen: sizeof(struct tcamsg), tb,
2219 TCA_ROOT_MAX, policy: tcaa_policy, extack: cb->extack);
2220 if (ret < 0)
2221 return ret;
2222
2223 kind = find_dump_kind(nla: tb);
2224 if (kind == NULL) {
2225 pr_info("tc_dump_action: action bad kind\n");
2226 return 0;
2227 }
2228
2229 a_o = tc_lookup_action(kind);
2230 if (a_o == NULL)
2231 return 0;
2232
2233 cb->args[2] = 0;
2234 if (tb[TCA_ROOT_FLAGS]) {
2235 bf = nla_get_bitfield32(nla: tb[TCA_ROOT_FLAGS]);
2236 cb->args[2] = bf.value;
2237 }
2238
2239 if (tb[TCA_ROOT_TIME_DELTA]) {
2240 msecs_since = nla_get_u32(nla: tb[TCA_ROOT_TIME_DELTA]);
2241 }
2242
2243 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, seq: cb->nlh->nlmsg_seq,
2244 type: cb->nlh->nlmsg_type, payload: sizeof(*t), flags: 0);
2245 if (!nlh)
2246 goto out_module_put;
2247
2248 if (msecs_since)
2249 jiffy_since = jiffies - msecs_to_jiffies(m: msecs_since);
2250
2251 t = nlmsg_data(nlh);
2252 t->tca_family = AF_UNSPEC;
2253 t->tca__pad1 = 0;
2254 t->tca__pad2 = 0;
2255 cb->args[3] = jiffy_since;
2256 count_attr = nla_reserve(skb, attrtype: TCA_ROOT_COUNT, attrlen: sizeof(u32));
2257 if (!count_attr)
2258 goto out_module_put;
2259
2260 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2261 if (nest == NULL)
2262 goto out_module_put;
2263
2264 ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, ops: a_o, NULL);
2265 if (ret < 0)
2266 goto out_module_put;
2267
2268 if (ret > 0) {
2269 nla_nest_end(skb, start: nest);
2270 ret = skb->len;
2271 act_count = cb->args[1];
2272 memcpy(to: nla_data(nla: count_attr), from: &act_count, len: sizeof(u32));
2273 cb->args[1] = 0;
2274 } else
2275 nlmsg_trim(skb, mark: b);
2276
2277 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2278 if (NETLINK_CB(cb->skb).portid && ret)
2279 nlh->nlmsg_flags |= NLM_F_MULTI;
2280 module_put(module: a_o->owner);
2281 return skb->len;
2282
2283out_module_put:
2284 module_put(module: a_o->owner);
2285 nlmsg_trim(skb, mark: b);
2286 return skb->len;
2287}
2288
2289static const struct rtnl_msg_handler tc_action_rtnl_msg_handlers[] __initconst = {
2290 {.msgtype = RTM_NEWACTION, .doit = tc_ctl_action},
2291 {.msgtype = RTM_DELACTION, .doit = tc_ctl_action},
2292 {.msgtype = RTM_GETACTION, .doit = tc_ctl_action,
2293 .dumpit = tc_dump_action},
2294};
2295
2296static int __init tc_action_init(void)
2297{
2298 rtnl_register_many(tc_action_rtnl_msg_handlers);
2299 return 0;
2300}
2301
2302subsys_initcall(tc_action_init);
2303