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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_api.c Packet action API.
4 *
5 * Author: Jamal Hadi Salim
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/string.h>
11#include <linux/errno.h>
12#include <linux/slab.h>
13#include <linux/skbuff.h>
14#include <linux/init.h>
15#include <linux/kmod.h>
16#include <linux/err.h>
17#include <linux/module.h>
18#include <net/net_namespace.h>
19#include <net/sock.h>
20#include <net/sch_generic.h>
21#include <net/pkt_cls.h>
22#include <net/tc_act/tc_pedit.h>
23#include <net/act_api.h>
24#include <net/netlink.h>
25#include <net/flow_offload.h>
26#include <net/tc_wrapper.h>
27
28#ifdef CONFIG_INET
29DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
30EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
31#endif
32
33int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
34{
35#ifdef CONFIG_INET
36 if (static_branch_unlikely(&tcf_frag_xmit_count))
37 return sch_frag_xmit_hook(skb, xmit);
38#endif
39
40 return xmit(skb);
41}
42EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
43
44static void tcf_action_goto_chain_exec(const struct tc_action *a,
45 struct tcf_result *res)
46{
47 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
48
49 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
50}
51
52static void tcf_free_cookie_rcu(struct rcu_head *p)
53{
54 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
55
56 kfree(cookie->data);
57 kfree(cookie);
58}
59
60static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
61 struct tc_cookie *new_cookie)
62{
63 struct tc_cookie *old;
64
65 old = unrcu_pointer(xchg(old_cookie, RCU_INITIALIZER(new_cookie)));
66 if (old)
67 call_rcu(&old->rcu, tcf_free_cookie_rcu);
68}
69
70int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
71 struct tcf_chain **newchain,
72 struct netlink_ext_ack *extack)
73{
74 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
75 u32 chain_index;
76
77 if (!opcode)
78 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
79 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
80 ret = 0;
81 if (ret) {
82 NL_SET_ERR_MSG(extack, "invalid control action");
83 goto end;
84 }
85
86 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
87 chain_index = action & TC_ACT_EXT_VAL_MASK;
88 if (!tp || !newchain) {
89 ret = -EINVAL;
90 NL_SET_ERR_MSG(extack,
91 "can't goto NULL proto/chain");
92 goto end;
93 }
94 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
95 if (!*newchain) {
96 ret = -ENOMEM;
97 NL_SET_ERR_MSG(extack,
98 "can't allocate goto_chain");
99 }
100 }
101end:
102 return ret;
103}
104EXPORT_SYMBOL(tcf_action_check_ctrlact);
105
106struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
107 struct tcf_chain *goto_chain)
108{
109 a->tcfa_action = action;
110 goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
111 return goto_chain;
112}
113EXPORT_SYMBOL(tcf_action_set_ctrlact);
114
115/* XXX: For standalone actions, we don't need a RCU grace period either, because
116 * actions are always connected to filters and filters are already destroyed in
117 * RCU callbacks, so after a RCU grace period actions are already disconnected
118 * from filters. Readers later can not find us.
119 */
120static void free_tcf(struct tc_action *p)
121{
122 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
123
124 free_percpu(p->cpu_bstats);
125 free_percpu(p->cpu_bstats_hw);
126 free_percpu(p->cpu_qstats);
127
128 tcf_set_action_cookie(&p->user_cookie, NULL);
129 if (chain)
130 tcf_chain_put_by_act(chain);
131
132 kfree(p);
133}
134
135static void offload_action_hw_count_set(struct tc_action *act,
136 u32 hw_count)
137{
138 act->in_hw_count = hw_count;
139}
140
141static void offload_action_hw_count_inc(struct tc_action *act,
142 u32 hw_count)
143{
144 act->in_hw_count += hw_count;
145}
146
147static void offload_action_hw_count_dec(struct tc_action *act,
148 u32 hw_count)
149{
150 act->in_hw_count = act->in_hw_count > hw_count ?
151 act->in_hw_count - hw_count : 0;
152}
153
154static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
155{
156 if (is_tcf_pedit(act))
157 return tcf_pedit_nkeys(act);
158 else
159 return 1;
160}
161
162static bool tc_act_skip_hw(u32 flags)
163{
164 return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
165}
166
167static bool tc_act_skip_sw(u32 flags)
168{
169 return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
170}
171
172/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
173static bool tc_act_flags_valid(u32 flags)
174{
175 flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
176
177 return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
178}
179
180static int offload_action_init(struct flow_offload_action *fl_action,
181 struct tc_action *act,
182 enum offload_act_command cmd,
183 struct netlink_ext_ack *extack)
184{
185 int err;
186
187 fl_action->extack = extack;
188 fl_action->command = cmd;
189 fl_action->index = act->tcfa_index;
190 fl_action->cookie = (unsigned long)act;
191
192 if (act->ops->offload_act_setup) {
193 spin_lock_bh(&act->tcfa_lock);
194 err = act->ops->offload_act_setup(act, fl_action, NULL,
195 false, extack);
196 spin_unlock_bh(&act->tcfa_lock);
197 return err;
198 }
199
200 return -EOPNOTSUPP;
201}
202
203static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
204 u32 *hw_count)
205{
206 int err;
207
208 err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
209 fl_act, NULL, NULL);
210 if (err < 0)
211 return err;
212
213 if (hw_count)
214 *hw_count = err;
215
216 return 0;
217}
218
219static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
220 u32 *hw_count,
221 flow_indr_block_bind_cb_t *cb,
222 void *cb_priv)
223{
224 int err;
225
226 err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
227 if (err < 0)
228 return err;
229
230 if (hw_count)
231 *hw_count = 1;
232
233 return 0;
234}
235
236static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
237 u32 *hw_count,
238 flow_indr_block_bind_cb_t *cb,
239 void *cb_priv)
240{
241 return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
242 cb, cb_priv) :
243 tcf_action_offload_cmd_ex(fl_act, hw_count);
244}
245
246static int tcf_action_offload_add_ex(struct tc_action *action,
247 struct netlink_ext_ack *extack,
248 flow_indr_block_bind_cb_t *cb,
249 void *cb_priv)
250{
251 bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
252 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
253 [0] = action,
254 };
255 struct flow_offload_action *fl_action;
256 u32 in_hw_count = 0;
257 int num, err = 0;
258
259 if (tc_act_skip_hw(action->tcfa_flags))
260 return 0;
261
262 num = tcf_offload_act_num_actions_single(action);
263 fl_action = offload_action_alloc(num);
264 if (!fl_action)
265 return -ENOMEM;
266
267 err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
268 if (err)
269 goto fl_err;
270
271 err = tc_setup_action(&fl_action->action, actions, 0, extack);
272 if (err) {
273 NL_SET_ERR_MSG_MOD(extack,
274 "Failed to setup tc actions for offload");
275 goto fl_err;
276 }
277
278 err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
279 if (!err)
280 cb ? offload_action_hw_count_inc(action, in_hw_count) :
281 offload_action_hw_count_set(action, in_hw_count);
282
283 if (skip_sw && !tc_act_in_hw(action))
284 err = -EINVAL;
285
286 tc_cleanup_offload_action(&fl_action->action);
287
288fl_err:
289 kfree(fl_action);
290
291 return err;
292}
293
294/* offload the tc action after it is inserted */
295static int tcf_action_offload_add(struct tc_action *action,
296 struct netlink_ext_ack *extack)
297{
298 return tcf_action_offload_add_ex(action, extack, NULL, NULL);
299}
300
301int tcf_action_update_hw_stats(struct tc_action *action)
302{
303 struct flow_offload_action fl_act = {};
304 int err;
305
306 err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
307 if (err)
308 return err;
309
310 err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
311 if (!err) {
312 preempt_disable();
313 tcf_action_stats_update(action, fl_act.stats.bytes,
314 fl_act.stats.pkts,
315 fl_act.stats.drops,
316 fl_act.stats.lastused,
317 true);
318 preempt_enable();
319 action->used_hw_stats = fl_act.stats.used_hw_stats;
320 action->used_hw_stats_valid = true;
321 } else {
322 return -EOPNOTSUPP;
323 }
324
325 return 0;
326}
327EXPORT_SYMBOL(tcf_action_update_hw_stats);
328
329static int tcf_action_offload_del_ex(struct tc_action *action,
330 flow_indr_block_bind_cb_t *cb,
331 void *cb_priv)
332{
333 struct flow_offload_action fl_act = {};
334 u32 in_hw_count = 0;
335 int err = 0;
336
337 if (!tc_act_in_hw(action))
338 return 0;
339
340 err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
341 if (err)
342 return err;
343
344 err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
345 if (err < 0)
346 return err;
347
348 if (!cb && action->in_hw_count != in_hw_count)
349 return -EINVAL;
350
351 /* do not need to update hw state when deleting action */
352 if (cb && in_hw_count)
353 offload_action_hw_count_dec(action, in_hw_count);
354
355 return 0;
356}
357
358static int tcf_action_offload_del(struct tc_action *action)
359{
360 return tcf_action_offload_del_ex(action, NULL, NULL);
361}
362
363static void tcf_action_cleanup(struct tc_action *p)
364{
365 tcf_action_offload_del(p);
366 if (p->ops->cleanup)
367 p->ops->cleanup(p);
368
369 gen_kill_estimator(&p->tcfa_rate_est);
370 free_tcf(p);
371}
372
373static int __tcf_action_put(struct tc_action *p, bool bind)
374{
375 struct tcf_idrinfo *idrinfo = p->idrinfo;
376
377 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
378 if (bind)
379 atomic_dec(&p->tcfa_bindcnt);
380 idr_remove(&idrinfo->action_idr, p->tcfa_index);
381 mutex_unlock(&idrinfo->lock);
382
383 tcf_action_cleanup(p);
384 return 1;
385 }
386
387 if (bind)
388 atomic_dec(&p->tcfa_bindcnt);
389
390 return 0;
391}
392
393static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
394{
395 int ret = 0;
396
397 /* Release with strict==1 and bind==0 is only called through act API
398 * interface (classifiers always bind). Only case when action with
399 * positive reference count and zero bind count can exist is when it was
400 * also created with act API (unbinding last classifier will destroy the
401 * action if it was created by classifier). So only case when bind count
402 * can be changed after initial check is when unbound action is
403 * destroyed by act API while classifier binds to action with same id
404 * concurrently. This result either creation of new action(same behavior
405 * as before), or reusing existing action if concurrent process
406 * increments reference count before action is deleted. Both scenarios
407 * are acceptable.
408 */
409 if (p) {
410 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
411 return -EPERM;
412
413 if (__tcf_action_put(p, bind))
414 ret = ACT_P_DELETED;
415 }
416
417 return ret;
418}
419
420int tcf_idr_release(struct tc_action *a, bool bind)
421{
422 const struct tc_action_ops *ops = a->ops;
423 int ret;
424
425 ret = __tcf_idr_release(a, bind, false);
426 if (ret == ACT_P_DELETED)
427 module_put(ops->owner);
428 return ret;
429}
430EXPORT_SYMBOL(tcf_idr_release);
431
432static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
433{
434 struct tc_cookie *user_cookie;
435 u32 cookie_len = 0;
436
437 rcu_read_lock();
438 user_cookie = rcu_dereference(act->user_cookie);
439
440 if (user_cookie)
441 cookie_len = nla_total_size(user_cookie->len);
442 rcu_read_unlock();
443
444 return nla_total_size(0) /* action number nested */
445 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
446 + cookie_len /* TCA_ACT_COOKIE */
447 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
448 + nla_total_size(0) /* TCA_ACT_STATS nested */
449 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
450 /* TCA_STATS_BASIC */
451 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
452 /* TCA_STATS_PKT64 */
453 + nla_total_size_64bit(sizeof(u64))
454 /* TCA_STATS_QUEUE */
455 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
456 + nla_total_size(0) /* TCA_ACT_OPTIONS nested */
457 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
458}
459
460static size_t tcf_action_full_attrs_size(size_t sz)
461{
462 return NLMSG_HDRLEN /* struct nlmsghdr */
463 + sizeof(struct tcamsg)
464 + nla_total_size(0) /* TCA_ACT_TAB nested */
465 + sz;
466}
467
468static size_t tcf_action_fill_size(const struct tc_action *act)
469{
470 size_t sz = tcf_action_shared_attrs_size(act);
471
472 if (act->ops->get_fill_size)
473 return act->ops->get_fill_size(act) + sz;
474 return sz;
475}
476
477static int
478tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
479{
480 unsigned char *b = skb_tail_pointer(skb);
481 struct tc_cookie *cookie;
482
483 if (nla_put_string(skb, TCA_ACT_KIND, a->ops->kind))
484 goto nla_put_failure;
485 if (tcf_action_copy_stats(skb, a, 0))
486 goto nla_put_failure;
487 if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
488 goto nla_put_failure;
489
490 rcu_read_lock();
491 cookie = rcu_dereference(a->user_cookie);
492 if (cookie) {
493 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
494 rcu_read_unlock();
495 goto nla_put_failure;
496 }
497 }
498 rcu_read_unlock();
499
500 return 0;
501
502nla_put_failure:
503 nlmsg_trim(skb, b);
504 return -1;
505}
506
507static int
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, false))
516 goto nla_put_failure;
517
518 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
519 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
520 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, TCA_ACT_USED_HW_STATS,
525 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, TCA_ACT_FLAGS,
531 flags, flags))
532 goto nla_put_failure;
533
534 if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
535 goto nla_put_failure;
536
537 nest = nla_nest_start_noflag(skb, 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, nest);
543 return err;
544 }
545
546nla_put_failure:
547 nlmsg_trim(skb, 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(&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(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, 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, p, true) :
588 tcf_action_dump_1(skb, p, 0, 0);
589 if (err < 0) {
590 index--;
591 nlmsg_trim(skb, nest);
592 goto done;
593 }
594 nla_nest_end(skb, 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(&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, nest);
613 goto done;
614}
615
616static int tcf_idr_release_unsafe(struct tc_action *p)
617{
618 if (atomic_read(&p->tcfa_bindcnt) > 0)
619 return -EPERM;
620
621 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
622 idr_remove(&p->idrinfo->action_idr, 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, 0);
643 if (nest == NULL)
644 goto nla_put_failure;
645 if (nla_put_string(skb, TCA_ACT_KIND, ops->kind))
646 goto nla_put_failure;
647
648 ret = 0;
649 mutex_lock(&idrinfo->lock);
650 idr_for_each_entry_ul(idr, p, tmp, id) {
651 if (IS_ERR(p))
652 continue;
653 ret = tcf_idr_release_unsafe(p);
654 if (ret == ACT_P_DELETED)
655 module_put(ops->owner);
656 else if (ret < 0)
657 break;
658 n_i++;
659 }
660 mutex_unlock(&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, TCA_FCNT, n_i);
669 if (ret)
670 goto nla_put_failure;
671 nla_nest_end(skb, nest);
672
673 return n_i;
674nla_put_failure:
675 nla_nest_cancel(skb, 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(&idrinfo->lock);
704 p = idr_find(&idrinfo->action_idr, index);
705 if (IS_ERR(p))
706 p = NULL;
707 else if (p)
708 refcount_inc(&p->tcfa_refcnt);
709 mutex_unlock(&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, 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, 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(&idrinfo->lock);
750 p = idr_find(&idrinfo->action_idr, index);
751 if (!p) {
752 mutex_unlock(&idrinfo->lock);
753 return -ENOENT;
754 }
755
756 if (!atomic_read(&p->tcfa_bindcnt)) {
757 if (refcount_dec_and_test(&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(&idrinfo->lock);
763
764 tcf_action_cleanup(p);
765 module_put(owner);
766 return 0;
767 }
768 ret = 0;
769 } else {
770 ret = -EPERM;
771 }
772
773 mutex_unlock(&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(&p->tcfa_refcnt, 1);
788 if (bind)
789 atomic_set(&p->tcfa_bindcnt, 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(&p->tcfa_bstats);
803 gnet_stats_basic_sync_init(&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(&p->tcfa_bstats, p->cpu_bstats,
812 &p->tcfa_rate_est,
813 &p->tcfa_lock, false, est);
814 if (err)
815 goto err4;
816 }
817
818 p->idrinfo = idrinfo;
819 __module_get(ops->owner);
820 p->ops = ops;
821 *a = p;
822 return 0;
823err4:
824 free_percpu(p->cpu_qstats);
825err3:
826 free_percpu(p->cpu_bstats_hw);
827err2:
828 free_percpu(p->cpu_bstats);
829err1:
830 kfree(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(&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(&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, *index);
879
880 if (IS_ERR(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(&p->tcfa_refcnt)) {
896 /* Action was deleted in parallel */
897 rcu_read_unlock();
898 return -EAGAIN;
899 }
900
901 if (bind)
902 atomic_inc(&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(&idrinfo->lock);
918 ret = idr_alloc_u32(&idrinfo->action_idr, ERR_PTR(-EBUSY), index, max,
919 GFP_KERNEL);
920 mutex_unlock(&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 struct tc_action *p;
937 int ret;
938 unsigned long id = 1;
939 unsigned long tmp;
940
941 idr_for_each_entry_ul(idr, p, tmp, id) {
942 ret = __tcf_idr_release(p, false, true);
943 if (ret == ACT_P_DELETED)
944 module_put(ops->owner);
945 else if (ret < 0)
946 return;
947 }
948 idr_destroy(&idrinfo->action_idr);
949}
950EXPORT_SYMBOL(tcf_idrinfo_destroy);
951
952static LIST_HEAD(act_base);
953static DEFINE_RWLOCK(act_mod_lock);
954/* since act ops id is stored in pernet subsystem list,
955 * then there is no way to walk through only all the action
956 * subsystem, so we keep tc action pernet ops id for
957 * reoffload to walk through.
958 */
959static LIST_HEAD(act_pernet_id_list);
960static DEFINE_MUTEX(act_id_mutex);
961struct tc_act_pernet_id {
962 struct list_head list;
963 unsigned int id;
964};
965
966static int tcf_pernet_add_id_list(unsigned int id)
967{
968 struct tc_act_pernet_id *id_ptr;
969 int ret = 0;
970
971 mutex_lock(&act_id_mutex);
972 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
973 if (id_ptr->id == id) {
974 ret = -EEXIST;
975 goto err_out;
976 }
977 }
978
979 id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
980 if (!id_ptr) {
981 ret = -ENOMEM;
982 goto err_out;
983 }
984 id_ptr->id = id;
985
986 list_add_tail(&id_ptr->list, &act_pernet_id_list);
987
988err_out:
989 mutex_unlock(&act_id_mutex);
990 return ret;
991}
992
993static void tcf_pernet_del_id_list(unsigned int id)
994{
995 struct tc_act_pernet_id *id_ptr;
996
997 mutex_lock(&act_id_mutex);
998 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
999 if (id_ptr->id == id) {
1000 list_del(&id_ptr->list);
1001 kfree(id_ptr);
1002 break;
1003 }
1004 }
1005 mutex_unlock(&act_id_mutex);
1006}
1007
1008int tcf_register_action(struct tc_action_ops *act,
1009 struct pernet_operations *ops)
1010{
1011 struct tc_action_ops *a;
1012 int ret;
1013
1014 if (!act->act || !act->dump || !act->init)
1015 return -EINVAL;
1016
1017 /* We have to register pernet ops before making the action ops visible,
1018 * otherwise tcf_action_init_1() could get a partially initialized
1019 * netns.
1020 */
1021 ret = register_pernet_subsys(ops);
1022 if (ret)
1023 return ret;
1024
1025 if (ops->id) {
1026 ret = tcf_pernet_add_id_list(*ops->id);
1027 if (ret)
1028 goto err_id;
1029 }
1030
1031 write_lock(&act_mod_lock);
1032 list_for_each_entry(a, &act_base, head) {
1033 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
1034 ret = -EEXIST;
1035 goto err_out;
1036 }
1037 }
1038 list_add_tail(&act->head, &act_base);
1039 write_unlock(&act_mod_lock);
1040
1041 return 0;
1042
1043err_out:
1044 write_unlock(&act_mod_lock);
1045 if (ops->id)
1046 tcf_pernet_del_id_list(*ops->id);
1047err_id:
1048 unregister_pernet_subsys(ops);
1049 return ret;
1050}
1051EXPORT_SYMBOL(tcf_register_action);
1052
1053int tcf_unregister_action(struct tc_action_ops *act,
1054 struct pernet_operations *ops)
1055{
1056 struct tc_action_ops *a;
1057 int err = -ENOENT;
1058
1059 write_lock(&act_mod_lock);
1060 list_for_each_entry(a, &act_base, head) {
1061 if (a == act) {
1062 list_del(&act->head);
1063 err = 0;
1064 break;
1065 }
1066 }
1067 write_unlock(&act_mod_lock);
1068 if (!err) {
1069 unregister_pernet_subsys(ops);
1070 if (ops->id)
1071 tcf_pernet_del_id_list(*ops->id);
1072 }
1073 return err;
1074}
1075EXPORT_SYMBOL(tcf_unregister_action);
1076
1077/* lookup by name */
1078static struct tc_action_ops *tc_lookup_action_n(char *kind)
1079{
1080 struct tc_action_ops *a, *res = NULL;
1081
1082 if (kind) {
1083 read_lock(&act_mod_lock);
1084 list_for_each_entry(a, &act_base, head) {
1085 if (strcmp(kind, a->kind) == 0) {
1086 if (try_module_get(a->owner))
1087 res = a;
1088 break;
1089 }
1090 }
1091 read_unlock(&act_mod_lock);
1092 }
1093 return res;
1094}
1095
1096/* lookup by nlattr */
1097static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1098{
1099 struct tc_action_ops *a, *res = NULL;
1100
1101 if (kind) {
1102 read_lock(&act_mod_lock);
1103 list_for_each_entry(a, &act_base, head) {
1104 if (nla_strcmp(kind, a->kind) == 0) {
1105 if (try_module_get(a->owner))
1106 res = a;
1107 break;
1108 }
1109 }
1110 read_unlock(&act_mod_lock);
1111 }
1112 return res;
1113}
1114
1115/*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1116#define TCA_ACT_MAX_PRIO_MASK 0x1FF
1117int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1118 int nr_actions, struct tcf_result *res)
1119{
1120 u32 jmp_prgcnt = 0;
1121 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1122 int i;
1123 int ret = TC_ACT_OK;
1124
1125 if (skb_skip_tc_classify(skb))
1126 return TC_ACT_OK;
1127
1128restart_act_graph:
1129 for (i = 0; i < nr_actions; i++) {
1130 const struct tc_action *a = actions[i];
1131 int repeat_ttl;
1132
1133 if (jmp_prgcnt > 0) {
1134 jmp_prgcnt -= 1;
1135 continue;
1136 }
1137
1138 if (tc_act_skip_sw(a->tcfa_flags))
1139 continue;
1140
1141 repeat_ttl = 32;
1142repeat:
1143 ret = tc_act(skb, a, res);
1144 if (unlikely(ret == TC_ACT_REPEAT)) {
1145 if (--repeat_ttl != 0)
1146 goto repeat;
1147 /* suspicious opcode, stop pipeline */
1148 net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1149 return TC_ACT_OK;
1150 }
1151 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1152 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1153 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1154 /* faulty opcode, stop pipeline */
1155 return TC_ACT_OK;
1156 } else {
1157 jmp_ttl -= 1;
1158 if (jmp_ttl > 0)
1159 goto restart_act_graph;
1160 else /* faulty graph, stop pipeline */
1161 return TC_ACT_OK;
1162 }
1163 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1164 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1165 tcf_set_drop_reason(skb,
1166 SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
1167 return TC_ACT_SHOT;
1168 }
1169 tcf_action_goto_chain_exec(a, res);
1170 }
1171
1172 if (ret != TC_ACT_PIPE)
1173 break;
1174 }
1175
1176 return ret;
1177}
1178EXPORT_SYMBOL(tcf_action_exec);
1179
1180int tcf_action_destroy(struct tc_action *actions[], int bind)
1181{
1182 const struct tc_action_ops *ops;
1183 struct tc_action *a;
1184 int ret = 0, i;
1185
1186 tcf_act_for_each_action(i, a, actions) {
1187 actions[i] = NULL;
1188 ops = a->ops;
1189 ret = __tcf_idr_release(a, bind, true);
1190 if (ret == ACT_P_DELETED)
1191 module_put(ops->owner);
1192 else if (ret < 0)
1193 return ret;
1194 }
1195 return ret;
1196}
1197
1198static int tcf_action_put(struct tc_action *p)
1199{
1200 return __tcf_action_put(p, false);
1201}
1202
1203static void tcf_action_put_many(struct tc_action *actions[])
1204{
1205 struct tc_action *a;
1206 int i;
1207
1208 tcf_act_for_each_action(i, a, actions) {
1209 const struct tc_action_ops *ops = a->ops;
1210 if (tcf_action_put(a))
1211 module_put(ops->owner);
1212 }
1213}
1214
1215static void tca_put_bound_many(struct tc_action *actions[], int init_res[])
1216{
1217 struct tc_action *a;
1218 int i;
1219
1220 tcf_act_for_each_action(i, a, actions) {
1221 const struct tc_action_ops *ops = a->ops;
1222
1223 if (init_res[i] == ACT_P_CREATED)
1224 continue;
1225
1226 if (tcf_action_put(a))
1227 module_put(ops->owner);
1228 }
1229}
1230
1231int
1232tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1233{
1234 return a->ops->dump(skb, a, bind, ref);
1235}
1236
1237int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1238 int bind, int ref, bool terse)
1239{
1240 struct tc_action *a;
1241 int err = -EINVAL, i;
1242 struct nlattr *nest;
1243
1244 tcf_act_for_each_action(i, a, actions) {
1245 nest = nla_nest_start_noflag(skb, i + 1);
1246 if (nest == NULL)
1247 goto nla_put_failure;
1248 err = terse ? tcf_action_dump_terse(skb, a, false) :
1249 tcf_action_dump_1(skb, a, bind, ref);
1250 if (err < 0)
1251 goto errout;
1252 nla_nest_end(skb, nest);
1253 }
1254
1255 return 0;
1256
1257nla_put_failure:
1258 err = -EINVAL;
1259errout:
1260 nla_nest_cancel(skb, nest);
1261 return err;
1262}
1263
1264static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1265{
1266 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1267 if (!c)
1268 return NULL;
1269
1270 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1271 if (!c->data) {
1272 kfree(c);
1273 return NULL;
1274 }
1275 c->len = nla_len(tb[TCA_ACT_COOKIE]);
1276
1277 return c;
1278}
1279
1280static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1281{
1282 struct nla_bitfield32 hw_stats_bf;
1283
1284 /* If the user did not pass the attr, that means he does
1285 * not care about the type. Return "any" in that case
1286 * which is setting on all supported types.
1287 */
1288 if (!hw_stats_attr)
1289 return TCA_ACT_HW_STATS_ANY;
1290 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
1291 return hw_stats_bf.value;
1292}
1293
1294static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1295 [TCA_ACT_KIND] = { .type = NLA_STRING },
1296 [TCA_ACT_INDEX] = { .type = NLA_U32 },
1297 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
1298 .len = TC_COOKIE_MAX_SIZE },
1299 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
1300 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1301 TCA_ACT_FLAGS_SKIP_HW |
1302 TCA_ACT_FLAGS_SKIP_SW),
1303 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1304};
1305
1306void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
1307{
1308 struct tc_action *a;
1309 int i;
1310
1311 tcf_act_for_each_action(i, a, actions) {
1312 struct tcf_idrinfo *idrinfo;
1313
1314 if (init_res[i] == ACT_P_BOUND)
1315 continue;
1316
1317 idrinfo = a->idrinfo;
1318 mutex_lock(&idrinfo->lock);
1319 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
1320 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1321 mutex_unlock(&idrinfo->lock);
1322 }
1323}
1324
1325struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
1326 struct netlink_ext_ack *extack)
1327{
1328 bool police = flags & TCA_ACT_FLAGS_POLICE;
1329 struct nlattr *tb[TCA_ACT_MAX + 1];
1330 struct tc_action_ops *a_o;
1331 char act_name[IFNAMSIZ];
1332 struct nlattr *kind;
1333 int err;
1334
1335 if (!police) {
1336 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1337 tcf_action_policy, extack);
1338 if (err < 0)
1339 return ERR_PTR(err);
1340 err = -EINVAL;
1341 kind = tb[TCA_ACT_KIND];
1342 if (!kind) {
1343 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1344 return ERR_PTR(err);
1345 }
1346 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
1347 NL_SET_ERR_MSG(extack, "TC action name too long");
1348 return ERR_PTR(err);
1349 }
1350 } else {
1351 if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
1352 NL_SET_ERR_MSG(extack, "TC action name too long");
1353 return ERR_PTR(-EINVAL);
1354 }
1355 }
1356
1357 a_o = tc_lookup_action_n(act_name);
1358 if (a_o == NULL) {
1359#ifdef CONFIG_MODULES
1360 bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL);
1361
1362 if (rtnl_held)
1363 rtnl_unlock();
1364 request_module(NET_ACT_ALIAS_PREFIX "%s", act_name);
1365 if (rtnl_held)
1366 rtnl_lock();
1367
1368 a_o = tc_lookup_action_n(act_name);
1369
1370 /* We dropped the RTNL semaphore in order to
1371 * perform the module load. So, even if we
1372 * succeeded in loading the module we have to
1373 * tell the caller to replay the request. We
1374 * indicate this using -EAGAIN.
1375 */
1376 if (a_o != NULL) {
1377 module_put(a_o->owner);
1378 return ERR_PTR(-EAGAIN);
1379 }
1380#endif
1381 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1382 return ERR_PTR(-ENOENT);
1383 }
1384
1385 return a_o;
1386}
1387
1388struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1389 struct nlattr *nla, struct nlattr *est,
1390 struct tc_action_ops *a_o, int *init_res,
1391 u32 flags, struct netlink_ext_ack *extack)
1392{
1393 bool police = flags & TCA_ACT_FLAGS_POLICE;
1394 struct nla_bitfield32 userflags = { 0, 0 };
1395 struct tc_cookie *user_cookie = NULL;
1396 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1397 struct nlattr *tb[TCA_ACT_MAX + 1];
1398 struct tc_action *a;
1399 int err;
1400
1401 /* backward compatibility for policer */
1402 if (!police) {
1403 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1404 tcf_action_policy, extack);
1405 if (err < 0)
1406 return ERR_PTR(err);
1407 if (tb[TCA_ACT_COOKIE]) {
1408 user_cookie = nla_memdup_cookie(tb);
1409 if (!user_cookie) {
1410 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1411 err = -ENOMEM;
1412 goto err_out;
1413 }
1414 }
1415 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1416 if (tb[TCA_ACT_FLAGS]) {
1417 userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1418 if (!tc_act_flags_valid(userflags.value)) {
1419 err = -EINVAL;
1420 goto err_out;
1421 }
1422 }
1423
1424 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1425 userflags.value | flags, extack);
1426 } else {
1427 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1428 extack);
1429 }
1430 if (err < 0)
1431 goto err_out;
1432 *init_res = err;
1433
1434 if (!police && tb[TCA_ACT_COOKIE])
1435 tcf_set_action_cookie(&a->user_cookie, user_cookie);
1436
1437 if (!police)
1438 a->hw_stats = hw_stats;
1439
1440 return a;
1441
1442err_out:
1443 if (user_cookie) {
1444 kfree(user_cookie->data);
1445 kfree(user_cookie);
1446 }
1447 return ERR_PTR(err);
1448}
1449
1450static bool tc_act_bind(u32 flags)
1451{
1452 return !!(flags & TCA_ACT_FLAGS_BIND);
1453}
1454
1455/* Returns numbers of initialized actions or negative error. */
1456
1457int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1458 struct nlattr *est, struct tc_action *actions[],
1459 int init_res[], size_t *attr_size,
1460 u32 flags, u32 fl_flags,
1461 struct netlink_ext_ack *extack)
1462{
1463 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1464 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1465 struct tc_action *act;
1466 size_t sz = 0;
1467 int err;
1468 int i;
1469
1470 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1471 extack);
1472 if (err < 0)
1473 return err;
1474
1475 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1476 struct tc_action_ops *a_o;
1477
1478 a_o = tc_action_load_ops(tb[i], flags, extack);
1479 if (IS_ERR(a_o)) {
1480 err = PTR_ERR(a_o);
1481 goto err_mod;
1482 }
1483 ops[i - 1] = a_o;
1484 }
1485
1486 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1487 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1488 &init_res[i - 1], flags, extack);
1489 if (IS_ERR(act)) {
1490 err = PTR_ERR(act);
1491 goto err;
1492 }
1493 sz += tcf_action_fill_size(act);
1494 /* Start from index 0 */
1495 actions[i - 1] = act;
1496 if (tc_act_bind(flags)) {
1497 bool skip_sw = tc_skip_sw(fl_flags);
1498 bool skip_hw = tc_skip_hw(fl_flags);
1499
1500 if (tc_act_bind(act->tcfa_flags)) {
1501 /* Action is created by classifier and is not
1502 * standalone. Check that the user did not set
1503 * any action flags different than the
1504 * classifier flags, and inherit the flags from
1505 * the classifier for the compatibility case
1506 * where no flags were specified at all.
1507 */
1508 if ((tc_act_skip_sw(act->tcfa_flags) && !skip_sw) ||
1509 (tc_act_skip_hw(act->tcfa_flags) && !skip_hw)) {
1510 NL_SET_ERR_MSG(extack,
1511 "Mismatch between action and filter offload flags");
1512 err = -EINVAL;
1513 goto err;
1514 }
1515 if (skip_sw)
1516 act->tcfa_flags |= TCA_ACT_FLAGS_SKIP_SW;
1517 if (skip_hw)
1518 act->tcfa_flags |= TCA_ACT_FLAGS_SKIP_HW;
1519 continue;
1520 }
1521
1522 /* Action is standalone */
1523 if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1524 skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
1525 NL_SET_ERR_MSG(extack,
1526 "Mismatch between action and filter offload flags");
1527 err = -EINVAL;
1528 goto err;
1529 }
1530 } else {
1531 err = tcf_action_offload_add(act, extack);
1532 if (tc_act_skip_sw(act->tcfa_flags) && err)
1533 goto err;
1534 }
1535 }
1536
1537 /* We have to commit them all together, because if any error happened in
1538 * between, we could not handle the failure gracefully.
1539 */
1540 tcf_idr_insert_many(actions, init_res);
1541
1542 *attr_size = tcf_action_full_attrs_size(sz);
1543 err = i - 1;
1544 goto err_mod;
1545
1546err:
1547 tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
1548err_mod:
1549 for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++)
1550 module_put(ops[i]->owner);
1551 return err;
1552}
1553
1554void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1555 u64 drops, bool hw)
1556{
1557 if (a->cpu_bstats) {
1558 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1559
1560 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1561
1562 if (hw)
1563 _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1564 bytes, packets);
1565 return;
1566 }
1567
1568 _bstats_update(&a->tcfa_bstats, bytes, packets);
1569 a->tcfa_qstats.drops += drops;
1570 if (hw)
1571 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1572}
1573EXPORT_SYMBOL(tcf_action_update_stats);
1574
1575int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1576 int compat_mode)
1577{
1578 int err = 0;
1579 struct gnet_dump d;
1580
1581 if (p == NULL)
1582 goto errout;
1583
1584 /* compat_mode being true specifies a call that is supposed
1585 * to add additional backward compatibility statistic TLVs.
1586 */
1587 if (compat_mode) {
1588 if (p->type == TCA_OLD_COMPAT)
1589 err = gnet_stats_start_copy_compat(skb, 0,
1590 TCA_STATS,
1591 TCA_XSTATS,
1592 &p->tcfa_lock, &d,
1593 TCA_PAD);
1594 else
1595 return 0;
1596 } else
1597 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1598 &p->tcfa_lock, &d, TCA_ACT_PAD);
1599
1600 if (err < 0)
1601 goto errout;
1602
1603 if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1604 &p->tcfa_bstats, false) < 0 ||
1605 gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1606 &p->tcfa_bstats_hw, false) < 0 ||
1607 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1608 gnet_stats_copy_queue(&d, p->cpu_qstats,
1609 &p->tcfa_qstats,
1610 p->tcfa_qstats.qlen) < 0)
1611 goto errout;
1612
1613 if (gnet_stats_finish_copy(&d) < 0)
1614 goto errout;
1615
1616 return 0;
1617
1618errout:
1619 return -1;
1620}
1621
1622static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1623 u32 portid, u32 seq, u16 flags, int event, int bind,
1624 int ref, struct netlink_ext_ack *extack)
1625{
1626 struct tcamsg *t;
1627 struct nlmsghdr *nlh;
1628 unsigned char *b = skb_tail_pointer(skb);
1629 struct nlattr *nest;
1630
1631 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1632 if (!nlh)
1633 goto out_nlmsg_trim;
1634 t = nlmsg_data(nlh);
1635 t->tca_family = AF_UNSPEC;
1636 t->tca__pad1 = 0;
1637 t->tca__pad2 = 0;
1638
1639 if (extack && extack->_msg &&
1640 nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg))
1641 goto out_nlmsg_trim;
1642
1643 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1644 if (!nest)
1645 goto out_nlmsg_trim;
1646
1647 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1648 goto out_nlmsg_trim;
1649
1650 nla_nest_end(skb, nest);
1651
1652 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1653
1654 return skb->len;
1655
1656out_nlmsg_trim:
1657 nlmsg_trim(skb, b);
1658 return -1;
1659}
1660
1661static int
1662tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1663 struct tc_action *actions[], int event,
1664 struct netlink_ext_ack *extack)
1665{
1666 struct sk_buff *skb;
1667
1668 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1669 if (!skb)
1670 return -ENOBUFS;
1671 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1672 0, 1, NULL) <= 0) {
1673 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1674 kfree_skb(skb);
1675 return -EINVAL;
1676 }
1677
1678 return rtnl_unicast(skb, net, portid);
1679}
1680
1681static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1682 struct nlmsghdr *n, u32 portid,
1683 struct netlink_ext_ack *extack)
1684{
1685 struct nlattr *tb[TCA_ACT_MAX + 1];
1686 const struct tc_action_ops *ops;
1687 struct tc_action *a;
1688 int index;
1689 int err;
1690
1691 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1692 tcf_action_policy, extack);
1693 if (err < 0)
1694 goto err_out;
1695
1696 err = -EINVAL;
1697 if (tb[TCA_ACT_INDEX] == NULL ||
1698 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1699 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1700 goto err_out;
1701 }
1702 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1703
1704 err = -EINVAL;
1705 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1706 if (!ops) { /* could happen in batch of actions */
1707 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1708 goto err_out;
1709 }
1710 err = -ENOENT;
1711 if (__tcf_idr_search(net, ops, &a, index) == 0) {
1712 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1713 goto err_mod;
1714 }
1715
1716 module_put(ops->owner);
1717 return a;
1718
1719err_mod:
1720 module_put(ops->owner);
1721err_out:
1722 return ERR_PTR(err);
1723}
1724
1725static int tca_action_flush(struct net *net, struct nlattr *nla,
1726 struct nlmsghdr *n, u32 portid,
1727 struct netlink_ext_ack *extack)
1728{
1729 struct sk_buff *skb;
1730 unsigned char *b;
1731 struct nlmsghdr *nlh;
1732 struct tcamsg *t;
1733 struct netlink_callback dcb;
1734 struct nlattr *nest;
1735 struct nlattr *tb[TCA_ACT_MAX + 1];
1736 const struct tc_action_ops *ops;
1737 struct nlattr *kind;
1738 int err = -ENOMEM;
1739
1740 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1741 if (!skb)
1742 return err;
1743
1744 b = skb_tail_pointer(skb);
1745
1746 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1747 tcf_action_policy, extack);
1748 if (err < 0)
1749 goto err_out;
1750
1751 err = -EINVAL;
1752 kind = tb[TCA_ACT_KIND];
1753 ops = tc_lookup_action(kind);
1754 if (!ops) { /*some idjot trying to flush unknown action */
1755 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1756 goto err_out;
1757 }
1758
1759 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1760 sizeof(*t), 0);
1761 if (!nlh) {
1762 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1763 goto out_module_put;
1764 }
1765 t = nlmsg_data(nlh);
1766 t->tca_family = AF_UNSPEC;
1767 t->tca__pad1 = 0;
1768 t->tca__pad2 = 0;
1769
1770 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1771 if (!nest) {
1772 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1773 goto out_module_put;
1774 }
1775
1776 err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack);
1777 if (err <= 0) {
1778 nla_nest_cancel(skb, nest);
1779 goto out_module_put;
1780 }
1781
1782 nla_nest_end(skb, nest);
1783
1784 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1785 nlh->nlmsg_flags |= NLM_F_ROOT;
1786 module_put(ops->owner);
1787 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1788 n->nlmsg_flags & NLM_F_ECHO);
1789 if (err < 0)
1790 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1791
1792 return err;
1793
1794out_module_put:
1795 module_put(ops->owner);
1796err_out:
1797 kfree_skb(skb);
1798 return err;
1799}
1800
1801static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1802{
1803 struct tc_action *a;
1804 int i;
1805
1806 tcf_act_for_each_action(i, a, actions) {
1807 const struct tc_action_ops *ops = a->ops;
1808 /* Actions can be deleted concurrently so we must save their
1809 * type and id to search again after reference is released.
1810 */
1811 struct tcf_idrinfo *idrinfo = a->idrinfo;
1812 u32 act_index = a->tcfa_index;
1813
1814 actions[i] = NULL;
1815 if (tcf_action_put(a)) {
1816 /* last reference, action was deleted concurrently */
1817 module_put(ops->owner);
1818 } else {
1819 int ret;
1820
1821 /* now do the delete */
1822 ret = tcf_idr_delete_index(idrinfo, act_index);
1823 if (ret < 0)
1824 return ret;
1825 }
1826 }
1827 return 0;
1828}
1829
1830static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net,
1831 struct tc_action *action)
1832{
1833 size_t attr_size = tcf_action_fill_size(action);
1834 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1835 [0] = action,
1836 };
1837 struct sk_buff *skb;
1838
1839 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1840 if (!skb)
1841 return ERR_PTR(-ENOBUFS);
1842
1843 if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) {
1844 kfree_skb(skb);
1845 return ERR_PTR(-EINVAL);
1846 }
1847
1848 return skb;
1849}
1850
1851static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1852{
1853 const struct tc_action_ops *ops = action->ops;
1854 struct sk_buff *skb;
1855 int ret;
1856
1857 if (!rtnl_notify_needed(net, 0, RTNLGRP_TC)) {
1858 skb = NULL;
1859 } else {
1860 skb = tcf_reoffload_del_notify_msg(net, action);
1861 if (IS_ERR(skb))
1862 return PTR_ERR(skb);
1863 }
1864
1865 ret = tcf_idr_release_unsafe(action);
1866 if (ret == ACT_P_DELETED) {
1867 module_put(ops->owner);
1868 ret = rtnetlink_maybe_send(skb, net, 0, RTNLGRP_TC, 0);
1869 } else {
1870 kfree_skb(skb);
1871 }
1872
1873 return ret;
1874}
1875
1876int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1877 void *cb_priv, bool add)
1878{
1879 struct tc_act_pernet_id *id_ptr;
1880 struct tcf_idrinfo *idrinfo;
1881 struct tc_action_net *tn;
1882 struct tc_action *p;
1883 unsigned int act_id;
1884 unsigned long tmp;
1885 unsigned long id;
1886 struct idr *idr;
1887 struct net *net;
1888 int ret;
1889
1890 if (!cb)
1891 return -EINVAL;
1892
1893 down_read(&net_rwsem);
1894 mutex_lock(&act_id_mutex);
1895
1896 for_each_net(net) {
1897 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1898 act_id = id_ptr->id;
1899 tn = net_generic(net, act_id);
1900 if (!tn)
1901 continue;
1902 idrinfo = tn->idrinfo;
1903 if (!idrinfo)
1904 continue;
1905
1906 mutex_lock(&idrinfo->lock);
1907 idr = &idrinfo->action_idr;
1908 idr_for_each_entry_ul(idr, p, tmp, id) {
1909 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1910 continue;
1911 if (add) {
1912 tcf_action_offload_add_ex(p, NULL, cb,
1913 cb_priv);
1914 continue;
1915 }
1916
1917 /* cb unregister to update hw count */
1918 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1919 if (ret < 0)
1920 continue;
1921 if (tc_act_skip_sw(p->tcfa_flags) &&
1922 !tc_act_in_hw(p))
1923 tcf_reoffload_del_notify(net, p);
1924 }
1925 mutex_unlock(&idrinfo->lock);
1926 }
1927 }
1928 mutex_unlock(&act_id_mutex);
1929 up_read(&net_rwsem);
1930
1931 return 0;
1932}
1933
1934static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n,
1935 struct tc_action *actions[],
1936 u32 portid, size_t attr_size,
1937 struct netlink_ext_ack *extack)
1938{
1939 struct sk_buff *skb;
1940
1941 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1942 if (!skb)
1943 return ERR_PTR(-ENOBUFS);
1944
1945 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1946 0, 2, extack) <= 0) {
1947 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1948 kfree_skb(skb);
1949 return ERR_PTR(-EINVAL);
1950 }
1951
1952 return skb;
1953}
1954
1955static int tcf_del_notify(struct net *net, struct nlmsghdr *n,
1956 struct tc_action *actions[], u32 portid,
1957 size_t attr_size, struct netlink_ext_ack *extack)
1958{
1959 struct sk_buff *skb;
1960 int ret;
1961
1962 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
1963 skb = NULL;
1964 } else {
1965 skb = tcf_del_notify_msg(net, n, actions, portid, attr_size,
1966 extack);
1967 if (IS_ERR(skb))
1968 return PTR_ERR(skb);
1969 }
1970
1971 /* now do the delete */
1972 ret = tcf_action_delete(net, actions);
1973 if (ret < 0) {
1974 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1975 kfree_skb(skb);
1976 return ret;
1977 }
1978
1979 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
1980 n->nlmsg_flags & NLM_F_ECHO);
1981}
1982
1983static int
1984tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1985 u32 portid, int event, struct netlink_ext_ack *extack)
1986{
1987 int i, ret;
1988 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1989 struct tc_action *act;
1990 size_t attr_size = 0;
1991 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1992
1993 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1994 extack);
1995 if (ret < 0)
1996 return ret;
1997
1998 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1999 if (tb[1])
2000 return tca_action_flush(net, tb[1], n, portid, extack);
2001
2002 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
2003 return -EINVAL;
2004 }
2005
2006 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
2007 act = tcf_action_get_1(net, tb[i], n, portid, extack);
2008 if (IS_ERR(act)) {
2009 ret = PTR_ERR(act);
2010 goto err;
2011 }
2012 attr_size += tcf_action_fill_size(act);
2013 actions[i - 1] = act;
2014 }
2015
2016 attr_size = tcf_action_full_attrs_size(attr_size);
2017
2018 if (event == RTM_GETACTION)
2019 ret = tcf_get_notify(net, portid, n, actions, event, extack);
2020 else { /* delete */
2021 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
2022 if (ret)
2023 goto err;
2024 return 0;
2025 }
2026err:
2027 tcf_action_put_many(actions);
2028 return ret;
2029}
2030
2031static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n,
2032 struct tc_action *actions[],
2033 u32 portid, size_t attr_size,
2034 struct netlink_ext_ack *extack)
2035{
2036 struct sk_buff *skb;
2037
2038 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
2039 if (!skb)
2040 return ERR_PTR(-ENOBUFS);
2041
2042 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
2043 RTM_NEWACTION, 0, 0, extack) <= 0) {
2044 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
2045 kfree_skb(skb);
2046 return ERR_PTR(-EINVAL);
2047 }
2048
2049 return skb;
2050}
2051
2052static int tcf_add_notify(struct net *net, struct nlmsghdr *n,
2053 struct tc_action *actions[], u32 portid,
2054 size_t attr_size, struct netlink_ext_ack *extack)
2055{
2056 struct sk_buff *skb;
2057
2058 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
2059 skb = NULL;
2060 } else {
2061 skb = tcf_add_notify_msg(net, n, actions, portid, attr_size,
2062 extack);
2063 if (IS_ERR(skb))
2064 return PTR_ERR(skb);
2065 }
2066
2067 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
2068 n->nlmsg_flags & NLM_F_ECHO);
2069}
2070
2071static int tcf_action_add(struct net *net, struct nlattr *nla,
2072 struct nlmsghdr *n, u32 portid, u32 flags,
2073 struct netlink_ext_ack *extack)
2074{
2075 size_t attr_size = 0;
2076 int loop, ret;
2077 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
2078 int init_res[TCA_ACT_MAX_PRIO] = {};
2079
2080 for (loop = 0; loop < 10; loop++) {
2081 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
2082 &attr_size, flags, 0, extack);
2083 if (ret != -EAGAIN)
2084 break;
2085 }
2086
2087 if (ret < 0)
2088 return ret;
2089
2090 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
2091
2092 /* only put bound actions */
2093 tca_put_bound_many(actions, init_res);
2094
2095 return ret;
2096}
2097
2098static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
2099 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2100 TCA_ACT_FLAG_TERSE_DUMP),
2101 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
2102};
2103
2104static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2105 struct netlink_ext_ack *extack)
2106{
2107 struct net *net = sock_net(skb->sk);
2108 struct nlattr *tca[TCA_ROOT_MAX + 1];
2109 u32 portid = NETLINK_CB(skb).portid;
2110 u32 flags = 0;
2111 int ret = 0;
2112
2113 if ((n->nlmsg_type != RTM_GETACTION) &&
2114 !netlink_capable(skb, CAP_NET_ADMIN))
2115 return -EPERM;
2116
2117 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
2118 TCA_ROOT_MAX, NULL, extack);
2119 if (ret < 0)
2120 return ret;
2121
2122 if (tca[TCA_ACT_TAB] == NULL) {
2123 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2124 return -EINVAL;
2125 }
2126
2127 /* n->nlmsg_flags & NLM_F_CREATE */
2128 switch (n->nlmsg_type) {
2129 case RTM_NEWACTION:
2130 /* we are going to assume all other flags
2131 * imply create only if it doesn't exist
2132 * Note that CREATE | EXCL implies that
2133 * but since we want avoid ambiguity (eg when flags
2134 * is zero) then just set this
2135 */
2136 if (n->nlmsg_flags & NLM_F_REPLACE)
2137 flags = TCA_ACT_FLAGS_REPLACE;
2138 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
2139 extack);
2140 break;
2141 case RTM_DELACTION:
2142 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2143 portid, RTM_DELACTION, extack);
2144 break;
2145 case RTM_GETACTION:
2146 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2147 portid, RTM_GETACTION, extack);
2148 break;
2149 default:
2150 BUG();
2151 }
2152
2153 return ret;
2154}
2155
2156static struct nlattr *find_dump_kind(struct nlattr **nla)
2157{
2158 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2159 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2160 struct nlattr *kind;
2161
2162 tb1 = nla[TCA_ACT_TAB];
2163 if (tb1 == NULL)
2164 return NULL;
2165
2166 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2167 return NULL;
2168
2169 if (tb[1] == NULL)
2170 return NULL;
2171 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
2172 return NULL;
2173 kind = tb2[TCA_ACT_KIND];
2174
2175 return kind;
2176}
2177
2178static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2179{
2180 struct net *net = sock_net(skb->sk);
2181 struct nlmsghdr *nlh;
2182 unsigned char *b = skb_tail_pointer(skb);
2183 struct nlattr *nest;
2184 struct tc_action_ops *a_o;
2185 int ret = 0;
2186 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
2187 struct nlattr *tb[TCA_ROOT_MAX + 1];
2188 struct nlattr *count_attr = NULL;
2189 unsigned long jiffy_since = 0;
2190 struct nlattr *kind = NULL;
2191 struct nla_bitfield32 bf;
2192 u32 msecs_since = 0;
2193 u32 act_count = 0;
2194
2195 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2196 TCA_ROOT_MAX, tcaa_policy, cb->extack);
2197 if (ret < 0)
2198 return ret;
2199
2200 kind = find_dump_kind(tb);
2201 if (kind == NULL) {
2202 pr_info("tc_dump_action: action bad kind\n");
2203 return 0;
2204 }
2205
2206 a_o = tc_lookup_action(kind);
2207 if (a_o == NULL)
2208 return 0;
2209
2210 cb->args[2] = 0;
2211 if (tb[TCA_ROOT_FLAGS]) {
2212 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2213 cb->args[2] = bf.value;
2214 }
2215
2216 if (tb[TCA_ROOT_TIME_DELTA]) {
2217 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2218 }
2219
2220 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2221 cb->nlh->nlmsg_type, sizeof(*t), 0);
2222 if (!nlh)
2223 goto out_module_put;
2224
2225 if (msecs_since)
2226 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2227
2228 t = nlmsg_data(nlh);
2229 t->tca_family = AF_UNSPEC;
2230 t->tca__pad1 = 0;
2231 t->tca__pad2 = 0;
2232 cb->args[3] = jiffy_since;
2233 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2234 if (!count_attr)
2235 goto out_module_put;
2236
2237 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2238 if (nest == NULL)
2239 goto out_module_put;
2240
2241 ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL);
2242 if (ret < 0)
2243 goto out_module_put;
2244
2245 if (ret > 0) {
2246 nla_nest_end(skb, nest);
2247 ret = skb->len;
2248 act_count = cb->args[1];
2249 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2250 cb->args[1] = 0;
2251 } else
2252 nlmsg_trim(skb, b);
2253
2254 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2255 if (NETLINK_CB(cb->skb).portid && ret)
2256 nlh->nlmsg_flags |= NLM_F_MULTI;
2257 module_put(a_o->owner);
2258 return skb->len;
2259
2260out_module_put:
2261 module_put(a_o->owner);
2262 nlmsg_trim(skb, b);
2263 return skb->len;
2264}
2265
2266static const struct rtnl_msg_handler tc_action_rtnl_msg_handlers[] __initconst = {
2267 {.msgtype = RTM_NEWACTION, .doit = tc_ctl_action},
2268 {.msgtype = RTM_DELACTION, .doit = tc_ctl_action},
2269 {.msgtype = RTM_GETACTION, .doit = tc_ctl_action,
2270 .dumpit = tc_dump_action},
2271};
2272
2273static int __init tc_action_init(void)
2274{
2275 rtnl_register_many(tc_action_rtnl_msg_handlers);
2276 return 0;
2277}
2278
2279subsys_initcall(tc_action_init);
1/*
2 * net/sched/act_api.c Packet action API.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Author: Jamal Hadi Salim
10 *
11 *
12 */
13
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/errno.h>
18#include <linux/slab.h>
19#include <linux/skbuff.h>
20#include <linux/init.h>
21#include <linux/kmod.h>
22#include <linux/err.h>
23#include <linux/module.h>
24#include <net/net_namespace.h>
25#include <net/sock.h>
26#include <net/sch_generic.h>
27#include <net/act_api.h>
28#include <net/netlink.h>
29
30void tcf_hash_destroy(struct tc_action *a)
31{
32 struct tcf_common *p = a->priv;
33 struct tcf_hashinfo *hinfo = a->ops->hinfo;
34
35 spin_lock_bh(&hinfo->lock);
36 hlist_del(&p->tcfc_head);
37 spin_unlock_bh(&hinfo->lock);
38 gen_kill_estimator(&p->tcfc_bstats,
39 &p->tcfc_rate_est);
40 /*
41 * gen_estimator est_timer() might access p->tcfc_lock
42 * or bstats, wait a RCU grace period before freeing p
43 */
44 kfree_rcu(p, tcfc_rcu);
45}
46EXPORT_SYMBOL(tcf_hash_destroy);
47
48int tcf_hash_release(struct tc_action *a, int bind)
49{
50 struct tcf_common *p = a->priv;
51 int ret = 0;
52
53 if (p) {
54 if (bind)
55 p->tcfc_bindcnt--;
56 else if (p->tcfc_bindcnt > 0)
57 return -EPERM;
58
59 p->tcfc_refcnt--;
60 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
61 if (a->ops->cleanup)
62 a->ops->cleanup(a, bind);
63 tcf_hash_destroy(a);
64 ret = 1;
65 }
66 }
67 return ret;
68}
69EXPORT_SYMBOL(tcf_hash_release);
70
71static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
72 struct tc_action *a)
73{
74 struct tcf_hashinfo *hinfo = a->ops->hinfo;
75 struct hlist_head *head;
76 struct tcf_common *p;
77 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
78 struct nlattr *nest;
79
80 spin_lock_bh(&hinfo->lock);
81
82 s_i = cb->args[0];
83
84 for (i = 0; i < (hinfo->hmask + 1); i++) {
85 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
86
87 hlist_for_each_entry_rcu(p, head, tcfc_head) {
88 index++;
89 if (index < s_i)
90 continue;
91 a->priv = p;
92 a->order = n_i;
93
94 nest = nla_nest_start(skb, a->order);
95 if (nest == NULL)
96 goto nla_put_failure;
97 err = tcf_action_dump_1(skb, a, 0, 0);
98 if (err < 0) {
99 index--;
100 nlmsg_trim(skb, nest);
101 goto done;
102 }
103 nla_nest_end(skb, nest);
104 n_i++;
105 if (n_i >= TCA_ACT_MAX_PRIO)
106 goto done;
107 }
108 }
109done:
110 spin_unlock_bh(&hinfo->lock);
111 if (n_i)
112 cb->args[0] += n_i;
113 return n_i;
114
115nla_put_failure:
116 nla_nest_cancel(skb, nest);
117 goto done;
118}
119
120static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a)
121{
122 struct tcf_hashinfo *hinfo = a->ops->hinfo;
123 struct hlist_head *head;
124 struct hlist_node *n;
125 struct tcf_common *p;
126 struct nlattr *nest;
127 int i = 0, n_i = 0;
128 int ret = -EINVAL;
129
130 nest = nla_nest_start(skb, a->order);
131 if (nest == NULL)
132 goto nla_put_failure;
133 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
134 goto nla_put_failure;
135 for (i = 0; i < (hinfo->hmask + 1); i++) {
136 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
137 hlist_for_each_entry_safe(p, n, head, tcfc_head) {
138 a->priv = p;
139 ret = tcf_hash_release(a, 0);
140 if (ret == ACT_P_DELETED) {
141 module_put(a->ops->owner);
142 n_i++;
143 } else if (ret < 0)
144 goto nla_put_failure;
145 }
146 }
147 if (nla_put_u32(skb, TCA_FCNT, n_i))
148 goto nla_put_failure;
149 nla_nest_end(skb, nest);
150
151 return n_i;
152nla_put_failure:
153 nla_nest_cancel(skb, nest);
154 return ret;
155}
156
157static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
158 int type, struct tc_action *a)
159{
160 if (type == RTM_DELACTION) {
161 return tcf_del_walker(skb, a);
162 } else if (type == RTM_GETACTION) {
163 return tcf_dump_walker(skb, cb, a);
164 } else {
165 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
166 return -EINVAL;
167 }
168}
169
170static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
171{
172 struct tcf_common *p = NULL;
173 struct hlist_head *head;
174
175 spin_lock_bh(&hinfo->lock);
176 head = &hinfo->htab[tcf_hash(index, hinfo->hmask)];
177 hlist_for_each_entry_rcu(p, head, tcfc_head)
178 if (p->tcfc_index == index)
179 break;
180 spin_unlock_bh(&hinfo->lock);
181
182 return p;
183}
184
185u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo)
186{
187 u32 val = hinfo->index;
188
189 do {
190 if (++val == 0)
191 val = 1;
192 } while (tcf_hash_lookup(val, hinfo));
193
194 hinfo->index = val;
195 return val;
196}
197EXPORT_SYMBOL(tcf_hash_new_index);
198
199int tcf_hash_search(struct tc_action *a, u32 index)
200{
201 struct tcf_hashinfo *hinfo = a->ops->hinfo;
202 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
203
204 if (p) {
205 a->priv = p;
206 return 1;
207 }
208 return 0;
209}
210EXPORT_SYMBOL(tcf_hash_search);
211
212int tcf_hash_check(u32 index, struct tc_action *a, int bind)
213{
214 struct tcf_hashinfo *hinfo = a->ops->hinfo;
215 struct tcf_common *p = NULL;
216 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
217 if (bind)
218 p->tcfc_bindcnt++;
219 p->tcfc_refcnt++;
220 a->priv = p;
221 return 1;
222 }
223 return 0;
224}
225EXPORT_SYMBOL(tcf_hash_check);
226
227void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est)
228{
229 struct tcf_common *pc = a->priv;
230 if (est)
231 gen_kill_estimator(&pc->tcfc_bstats,
232 &pc->tcfc_rate_est);
233 kfree_rcu(pc, tcfc_rcu);
234}
235EXPORT_SYMBOL(tcf_hash_cleanup);
236
237int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a,
238 int size, int bind)
239{
240 struct tcf_hashinfo *hinfo = a->ops->hinfo;
241 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
242
243 if (unlikely(!p))
244 return -ENOMEM;
245 p->tcfc_refcnt = 1;
246 if (bind)
247 p->tcfc_bindcnt = 1;
248
249 spin_lock_init(&p->tcfc_lock);
250 INIT_HLIST_NODE(&p->tcfc_head);
251 p->tcfc_index = index ? index : tcf_hash_new_index(hinfo);
252 p->tcfc_tm.install = jiffies;
253 p->tcfc_tm.lastuse = jiffies;
254 if (est) {
255 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
256 &p->tcfc_lock, est);
257 if (err) {
258 kfree(p);
259 return err;
260 }
261 }
262
263 a->priv = (void *) p;
264 return 0;
265}
266EXPORT_SYMBOL(tcf_hash_create);
267
268void tcf_hash_insert(struct tc_action *a)
269{
270 struct tcf_common *p = a->priv;
271 struct tcf_hashinfo *hinfo = a->ops->hinfo;
272 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
273
274 spin_lock_bh(&hinfo->lock);
275 hlist_add_head(&p->tcfc_head, &hinfo->htab[h]);
276 spin_unlock_bh(&hinfo->lock);
277}
278EXPORT_SYMBOL(tcf_hash_insert);
279
280static LIST_HEAD(act_base);
281static DEFINE_RWLOCK(act_mod_lock);
282
283int tcf_register_action(struct tc_action_ops *act, unsigned int mask)
284{
285 struct tc_action_ops *a;
286 int err;
287
288 /* Must supply act, dump and init */
289 if (!act->act || !act->dump || !act->init)
290 return -EINVAL;
291
292 /* Supply defaults */
293 if (!act->lookup)
294 act->lookup = tcf_hash_search;
295 if (!act->walk)
296 act->walk = tcf_generic_walker;
297
298 act->hinfo = kmalloc(sizeof(struct tcf_hashinfo), GFP_KERNEL);
299 if (!act->hinfo)
300 return -ENOMEM;
301 err = tcf_hashinfo_init(act->hinfo, mask);
302 if (err) {
303 kfree(act->hinfo);
304 return err;
305 }
306
307 write_lock(&act_mod_lock);
308 list_for_each_entry(a, &act_base, head) {
309 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
310 write_unlock(&act_mod_lock);
311 tcf_hashinfo_destroy(act->hinfo);
312 kfree(act->hinfo);
313 return -EEXIST;
314 }
315 }
316 list_add_tail(&act->head, &act_base);
317 write_unlock(&act_mod_lock);
318 return 0;
319}
320EXPORT_SYMBOL(tcf_register_action);
321
322int tcf_unregister_action(struct tc_action_ops *act)
323{
324 struct tc_action_ops *a;
325 int err = -ENOENT;
326
327 write_lock(&act_mod_lock);
328 list_for_each_entry(a, &act_base, head) {
329 if (a == act) {
330 list_del(&act->head);
331 tcf_hashinfo_destroy(act->hinfo);
332 kfree(act->hinfo);
333 err = 0;
334 break;
335 }
336 }
337 write_unlock(&act_mod_lock);
338 return err;
339}
340EXPORT_SYMBOL(tcf_unregister_action);
341
342/* lookup by name */
343static struct tc_action_ops *tc_lookup_action_n(char *kind)
344{
345 struct tc_action_ops *a, *res = NULL;
346
347 if (kind) {
348 read_lock(&act_mod_lock);
349 list_for_each_entry(a, &act_base, head) {
350 if (strcmp(kind, a->kind) == 0) {
351 if (try_module_get(a->owner))
352 res = a;
353 break;
354 }
355 }
356 read_unlock(&act_mod_lock);
357 }
358 return res;
359}
360
361/* lookup by nlattr */
362static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
363{
364 struct tc_action_ops *a, *res = NULL;
365
366 if (kind) {
367 read_lock(&act_mod_lock);
368 list_for_each_entry(a, &act_base, head) {
369 if (nla_strcmp(kind, a->kind) == 0) {
370 if (try_module_get(a->owner))
371 res = a;
372 break;
373 }
374 }
375 read_unlock(&act_mod_lock);
376 }
377 return res;
378}
379
380int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
381 struct tcf_result *res)
382{
383 const struct tc_action *a;
384 int ret = -1;
385
386 if (skb->tc_verd & TC_NCLS) {
387 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
388 ret = TC_ACT_OK;
389 goto exec_done;
390 }
391 list_for_each_entry(a, actions, list) {
392repeat:
393 ret = a->ops->act(skb, a, res);
394 if (TC_MUNGED & skb->tc_verd) {
395 /* copied already, allow trampling */
396 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
397 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
398 }
399 if (ret == TC_ACT_REPEAT)
400 goto repeat; /* we need a ttl - JHS */
401 if (ret != TC_ACT_PIPE)
402 goto exec_done;
403 }
404exec_done:
405 return ret;
406}
407EXPORT_SYMBOL(tcf_action_exec);
408
409int tcf_action_destroy(struct list_head *actions, int bind)
410{
411 struct tc_action *a, *tmp;
412 int ret = 0;
413
414 list_for_each_entry_safe(a, tmp, actions, list) {
415 ret = tcf_hash_release(a, bind);
416 if (ret == ACT_P_DELETED)
417 module_put(a->ops->owner);
418 else if (ret < 0)
419 return ret;
420 list_del(&a->list);
421 kfree(a);
422 }
423 return ret;
424}
425
426int
427tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
428{
429 return a->ops->dump(skb, a, bind, ref);
430}
431
432int
433tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
434{
435 int err = -EINVAL;
436 unsigned char *b = skb_tail_pointer(skb);
437 struct nlattr *nest;
438
439 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
440 goto nla_put_failure;
441 if (tcf_action_copy_stats(skb, a, 0))
442 goto nla_put_failure;
443 nest = nla_nest_start(skb, TCA_OPTIONS);
444 if (nest == NULL)
445 goto nla_put_failure;
446 err = tcf_action_dump_old(skb, a, bind, ref);
447 if (err > 0) {
448 nla_nest_end(skb, nest);
449 return err;
450 }
451
452nla_put_failure:
453 nlmsg_trim(skb, b);
454 return -1;
455}
456EXPORT_SYMBOL(tcf_action_dump_1);
457
458int
459tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref)
460{
461 struct tc_action *a;
462 int err = -EINVAL;
463 struct nlattr *nest;
464
465 list_for_each_entry(a, actions, list) {
466 nest = nla_nest_start(skb, a->order);
467 if (nest == NULL)
468 goto nla_put_failure;
469 err = tcf_action_dump_1(skb, a, bind, ref);
470 if (err < 0)
471 goto errout;
472 nla_nest_end(skb, nest);
473 }
474
475 return 0;
476
477nla_put_failure:
478 err = -EINVAL;
479errout:
480 nla_nest_cancel(skb, nest);
481 return err;
482}
483
484struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
485 struct nlattr *est, char *name, int ovr,
486 int bind)
487{
488 struct tc_action *a;
489 struct tc_action_ops *a_o;
490 char act_name[IFNAMSIZ];
491 struct nlattr *tb[TCA_ACT_MAX + 1];
492 struct nlattr *kind;
493 int err;
494
495 if (name == NULL) {
496 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
497 if (err < 0)
498 goto err_out;
499 err = -EINVAL;
500 kind = tb[TCA_ACT_KIND];
501 if (kind == NULL)
502 goto err_out;
503 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
504 goto err_out;
505 } else {
506 err = -EINVAL;
507 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
508 goto err_out;
509 }
510
511 a_o = tc_lookup_action_n(act_name);
512 if (a_o == NULL) {
513#ifdef CONFIG_MODULES
514 rtnl_unlock();
515 request_module("act_%s", act_name);
516 rtnl_lock();
517
518 a_o = tc_lookup_action_n(act_name);
519
520 /* We dropped the RTNL semaphore in order to
521 * perform the module load. So, even if we
522 * succeeded in loading the module we have to
523 * tell the caller to replay the request. We
524 * indicate this using -EAGAIN.
525 */
526 if (a_o != NULL) {
527 err = -EAGAIN;
528 goto err_mod;
529 }
530#endif
531 err = -ENOENT;
532 goto err_out;
533 }
534
535 err = -ENOMEM;
536 a = kzalloc(sizeof(*a), GFP_KERNEL);
537 if (a == NULL)
538 goto err_mod;
539
540 a->ops = a_o;
541 INIT_LIST_HEAD(&a->list);
542 /* backward compatibility for policer */
543 if (name == NULL)
544 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
545 else
546 err = a_o->init(net, nla, est, a, ovr, bind);
547 if (err < 0)
548 goto err_free;
549
550 /* module count goes up only when brand new policy is created
551 * if it exists and is only bound to in a_o->init() then
552 * ACT_P_CREATED is not returned (a zero is).
553 */
554 if (err != ACT_P_CREATED)
555 module_put(a_o->owner);
556
557 return a;
558
559err_free:
560 kfree(a);
561err_mod:
562 module_put(a_o->owner);
563err_out:
564 return ERR_PTR(err);
565}
566
567int tcf_action_init(struct net *net, struct nlattr *nla,
568 struct nlattr *est, char *name, int ovr,
569 int bind, struct list_head *actions)
570{
571 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
572 struct tc_action *act;
573 int err;
574 int i;
575
576 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
577 if (err < 0)
578 return err;
579
580 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
581 act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
582 if (IS_ERR(act)) {
583 err = PTR_ERR(act);
584 goto err;
585 }
586 act->order = i;
587 list_add_tail(&act->list, actions);
588 }
589 return 0;
590
591err:
592 tcf_action_destroy(actions, bind);
593 return err;
594}
595
596int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
597 int compat_mode)
598{
599 int err = 0;
600 struct gnet_dump d;
601 struct tcf_common *p = a->priv;
602
603 if (p == NULL)
604 goto errout;
605
606 /* compat_mode being true specifies a call that is supposed
607 * to add additional backward compatibility statistic TLVs.
608 */
609 if (compat_mode) {
610 if (a->type == TCA_OLD_COMPAT)
611 err = gnet_stats_start_copy_compat(skb, 0,
612 TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d);
613 else
614 return 0;
615 } else
616 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
617 &p->tcfc_lock, &d);
618
619 if (err < 0)
620 goto errout;
621
622 if (gnet_stats_copy_basic(&d, &p->tcfc_bstats) < 0 ||
623 gnet_stats_copy_rate_est(&d, &p->tcfc_bstats,
624 &p->tcfc_rate_est) < 0 ||
625 gnet_stats_copy_queue(&d, &p->tcfc_qstats) < 0)
626 goto errout;
627
628 if (gnet_stats_finish_copy(&d) < 0)
629 goto errout;
630
631 return 0;
632
633errout:
634 return -1;
635}
636
637static int
638tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq,
639 u16 flags, int event, int bind, int ref)
640{
641 struct tcamsg *t;
642 struct nlmsghdr *nlh;
643 unsigned char *b = skb_tail_pointer(skb);
644 struct nlattr *nest;
645
646 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
647 if (!nlh)
648 goto out_nlmsg_trim;
649 t = nlmsg_data(nlh);
650 t->tca_family = AF_UNSPEC;
651 t->tca__pad1 = 0;
652 t->tca__pad2 = 0;
653
654 nest = nla_nest_start(skb, TCA_ACT_TAB);
655 if (nest == NULL)
656 goto out_nlmsg_trim;
657
658 if (tcf_action_dump(skb, actions, bind, ref) < 0)
659 goto out_nlmsg_trim;
660
661 nla_nest_end(skb, nest);
662
663 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
664 return skb->len;
665
666out_nlmsg_trim:
667 nlmsg_trim(skb, b);
668 return -1;
669}
670
671static int
672act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
673 struct list_head *actions, int event)
674{
675 struct sk_buff *skb;
676
677 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
678 if (!skb)
679 return -ENOBUFS;
680 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
681 kfree_skb(skb);
682 return -EINVAL;
683 }
684
685 return rtnl_unicast(skb, net, portid);
686}
687
688static struct tc_action *create_a(int i)
689{
690 struct tc_action *act;
691
692 act = kzalloc(sizeof(*act), GFP_KERNEL);
693 if (act == NULL) {
694 pr_debug("create_a: failed to alloc!\n");
695 return NULL;
696 }
697 act->order = i;
698 INIT_LIST_HEAD(&act->list);
699 return act;
700}
701
702static struct tc_action *
703tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid)
704{
705 struct nlattr *tb[TCA_ACT_MAX + 1];
706 struct tc_action *a;
707 int index;
708 int err;
709
710 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
711 if (err < 0)
712 goto err_out;
713
714 err = -EINVAL;
715 if (tb[TCA_ACT_INDEX] == NULL ||
716 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
717 goto err_out;
718 index = nla_get_u32(tb[TCA_ACT_INDEX]);
719
720 err = -ENOMEM;
721 a = create_a(0);
722 if (a == NULL)
723 goto err_out;
724
725 err = -EINVAL;
726 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
727 if (a->ops == NULL) /* could happen in batch of actions */
728 goto err_free;
729 err = -ENOENT;
730 if (a->ops->lookup(a, index) == 0)
731 goto err_mod;
732
733 module_put(a->ops->owner);
734 return a;
735
736err_mod:
737 module_put(a->ops->owner);
738err_free:
739 kfree(a);
740err_out:
741 return ERR_PTR(err);
742}
743
744static void cleanup_a(struct list_head *actions)
745{
746 struct tc_action *a, *tmp;
747
748 list_for_each_entry_safe(a, tmp, actions, list) {
749 list_del(&a->list);
750 kfree(a);
751 }
752}
753
754static int tca_action_flush(struct net *net, struct nlattr *nla,
755 struct nlmsghdr *n, u32 portid)
756{
757 struct sk_buff *skb;
758 unsigned char *b;
759 struct nlmsghdr *nlh;
760 struct tcamsg *t;
761 struct netlink_callback dcb;
762 struct nlattr *nest;
763 struct nlattr *tb[TCA_ACT_MAX + 1];
764 struct nlattr *kind;
765 struct tc_action a;
766 int err = -ENOMEM;
767
768 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
769 if (!skb) {
770 pr_debug("tca_action_flush: failed skb alloc\n");
771 return err;
772 }
773
774 b = skb_tail_pointer(skb);
775
776 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
777 if (err < 0)
778 goto err_out;
779
780 err = -EINVAL;
781 kind = tb[TCA_ACT_KIND];
782 memset(&a, 0, sizeof(struct tc_action));
783 INIT_LIST_HEAD(&a.list);
784 a.ops = tc_lookup_action(kind);
785 if (a.ops == NULL) /*some idjot trying to flush unknown action */
786 goto err_out;
787
788 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0);
789 if (!nlh)
790 goto out_module_put;
791 t = nlmsg_data(nlh);
792 t->tca_family = AF_UNSPEC;
793 t->tca__pad1 = 0;
794 t->tca__pad2 = 0;
795
796 nest = nla_nest_start(skb, TCA_ACT_TAB);
797 if (nest == NULL)
798 goto out_module_put;
799
800 err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a);
801 if (err < 0)
802 goto out_module_put;
803 if (err == 0)
804 goto noflush_out;
805
806 nla_nest_end(skb, nest);
807
808 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
809 nlh->nlmsg_flags |= NLM_F_ROOT;
810 module_put(a.ops->owner);
811 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
812 n->nlmsg_flags & NLM_F_ECHO);
813 if (err > 0)
814 return 0;
815
816 return err;
817
818out_module_put:
819 module_put(a.ops->owner);
820err_out:
821noflush_out:
822 kfree_skb(skb);
823 return err;
824}
825
826static int
827tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
828 u32 portid)
829{
830 int ret;
831 struct sk_buff *skb;
832
833 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
834 if (!skb)
835 return -ENOBUFS;
836
837 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
838 0, 1) <= 0) {
839 kfree_skb(skb);
840 return -EINVAL;
841 }
842
843 /* now do the delete */
844 ret = tcf_action_destroy(actions, 0);
845 if (ret < 0) {
846 kfree_skb(skb);
847 return ret;
848 }
849
850 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
851 n->nlmsg_flags & NLM_F_ECHO);
852 if (ret > 0)
853 return 0;
854 return ret;
855}
856
857static int
858tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
859 u32 portid, int event)
860{
861 int i, ret;
862 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
863 struct tc_action *act;
864 LIST_HEAD(actions);
865
866 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
867 if (ret < 0)
868 return ret;
869
870 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
871 if (tb[1] != NULL)
872 return tca_action_flush(net, tb[1], n, portid);
873 else
874 return -EINVAL;
875 }
876
877 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
878 act = tcf_action_get_1(tb[i], n, portid);
879 if (IS_ERR(act)) {
880 ret = PTR_ERR(act);
881 goto err;
882 }
883 act->order = i;
884 list_add_tail(&act->list, &actions);
885 }
886
887 if (event == RTM_GETACTION)
888 ret = act_get_notify(net, portid, n, &actions, event);
889 else { /* delete */
890 ret = tcf_del_notify(net, n, &actions, portid);
891 if (ret)
892 goto err;
893 return ret;
894 }
895err:
896 cleanup_a(&actions);
897 return ret;
898}
899
900static int
901tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
902 u32 portid)
903{
904 struct sk_buff *skb;
905 int err = 0;
906
907 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
908 if (!skb)
909 return -ENOBUFS;
910
911 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
912 RTM_NEWACTION, 0, 0) <= 0) {
913 kfree_skb(skb);
914 return -EINVAL;
915 }
916
917 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
918 n->nlmsg_flags & NLM_F_ECHO);
919 if (err > 0)
920 err = 0;
921 return err;
922}
923
924static int
925tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
926 u32 portid, int ovr)
927{
928 int ret = 0;
929 LIST_HEAD(actions);
930
931 ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions);
932 if (ret)
933 goto done;
934
935 /* dump then free all the actions after update; inserted policy
936 * stays intact
937 */
938 ret = tcf_add_notify(net, n, &actions, portid);
939 cleanup_a(&actions);
940done:
941 return ret;
942}
943
944static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
945{
946 struct net *net = sock_net(skb->sk);
947 struct nlattr *tca[TCA_ACT_MAX + 1];
948 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
949 int ret = 0, ovr = 0;
950
951 if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN))
952 return -EPERM;
953
954 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
955 if (ret < 0)
956 return ret;
957
958 if (tca[TCA_ACT_TAB] == NULL) {
959 pr_notice("tc_ctl_action: received NO action attribs\n");
960 return -EINVAL;
961 }
962
963 /* n->nlmsg_flags & NLM_F_CREATE */
964 switch (n->nlmsg_type) {
965 case RTM_NEWACTION:
966 /* we are going to assume all other flags
967 * imply create only if it doesn't exist
968 * Note that CREATE | EXCL implies that
969 * but since we want avoid ambiguity (eg when flags
970 * is zero) then just set this
971 */
972 if (n->nlmsg_flags & NLM_F_REPLACE)
973 ovr = 1;
974replay:
975 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
976 if (ret == -EAGAIN)
977 goto replay;
978 break;
979 case RTM_DELACTION:
980 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
981 portid, RTM_DELACTION);
982 break;
983 case RTM_GETACTION:
984 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
985 portid, RTM_GETACTION);
986 break;
987 default:
988 BUG();
989 }
990
991 return ret;
992}
993
994static struct nlattr *
995find_dump_kind(const struct nlmsghdr *n)
996{
997 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
998 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
999 struct nlattr *nla[TCAA_MAX + 1];
1000 struct nlattr *kind;
1001
1002 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1003 return NULL;
1004 tb1 = nla[TCA_ACT_TAB];
1005 if (tb1 == NULL)
1006 return NULL;
1007
1008 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1009 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1010 return NULL;
1011
1012 if (tb[1] == NULL)
1013 return NULL;
1014 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1015 nla_len(tb[1]), NULL) < 0)
1016 return NULL;
1017 kind = tb2[TCA_ACT_KIND];
1018
1019 return kind;
1020}
1021
1022static int
1023tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1024{
1025 struct nlmsghdr *nlh;
1026 unsigned char *b = skb_tail_pointer(skb);
1027 struct nlattr *nest;
1028 struct tc_action_ops *a_o;
1029 struct tc_action a;
1030 int ret = 0;
1031 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1032 struct nlattr *kind = find_dump_kind(cb->nlh);
1033
1034 if (kind == NULL) {
1035 pr_info("tc_dump_action: action bad kind\n");
1036 return 0;
1037 }
1038
1039 a_o = tc_lookup_action(kind);
1040 if (a_o == NULL)
1041 return 0;
1042
1043 memset(&a, 0, sizeof(struct tc_action));
1044 a.ops = a_o;
1045
1046 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1047 cb->nlh->nlmsg_type, sizeof(*t), 0);
1048 if (!nlh)
1049 goto out_module_put;
1050 t = nlmsg_data(nlh);
1051 t->tca_family = AF_UNSPEC;
1052 t->tca__pad1 = 0;
1053 t->tca__pad2 = 0;
1054
1055 nest = nla_nest_start(skb, TCA_ACT_TAB);
1056 if (nest == NULL)
1057 goto out_module_put;
1058
1059 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1060 if (ret < 0)
1061 goto out_module_put;
1062
1063 if (ret > 0) {
1064 nla_nest_end(skb, nest);
1065 ret = skb->len;
1066 } else
1067 nla_nest_cancel(skb, nest);
1068
1069 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1070 if (NETLINK_CB(cb->skb).portid && ret)
1071 nlh->nlmsg_flags |= NLM_F_MULTI;
1072 module_put(a_o->owner);
1073 return skb->len;
1074
1075out_module_put:
1076 module_put(a_o->owner);
1077 nlmsg_trim(skb, b);
1078 return skb->len;
1079}
1080
1081static int __init tc_action_init(void)
1082{
1083 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1084 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1085 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1086 NULL);
1087
1088 return 0;
1089}
1090
1091subsys_initcall(tc_action_init);