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Linux 6.16-rc6
[linux-2.6-block.git] / net / sched / act_api.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * net/sched/act_api.c Packet action API.
4 *
1da177e4 5 * Author: Jamal Hadi Salim
1da177e4
LT		 6 */
7
1da177e4
LT		 8#include <linux/types.h>
9#include <linux/kernel.h>
1da177e4 10#include <linux/string.h>
1da177e4 11#include <linux/errno.h>
5a0e3ad6 12#include <linux/slab.h>
1da177e4 13#include <linux/skbuff.h>
1da177e4
LT		 14#include <linux/init.h>
15#include <linux/kmod.h>
ab27cfb8 16#include <linux/err.h>
3a9a231d 17#include <linux/module.h>
b854272b
DL		 18#include <net/net_namespace.h>
19#include <net/sock.h>
1da177e4 20#include <net/sch_generic.h>
1045ba77 21#include <net/pkt_cls.h>
8cbfe939 22#include <net/tc_act/tc_pedit.h>
1da177e4 23#include <net/act_api.h>
dc5fc579 24#include <net/netlink.h>
8cbfe939 25#include <net/flow_offload.h>
871cf386 26#include <net/tc_wrapper.h>
1da177e4 27
c129412f 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
db50514f
JP		 44static void tcf_action_goto_chain_exec(const struct tc_action *a,
45 struct tcf_result *res)
46{
ee3bbfe8 47 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
db50514f
JP		 48
49 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
50}
51
eec94fdb
VB		 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
b4cb4a13 65 old = unrcu_pointer(xchg(old_cookie, RCU_INITIALIZER(new_cookie)));
eec94fdb
VB		 66 if (old)
67 call_rcu(&old->rcu, tcf_free_cookie_rcu);
68}
69
85d0966f
DC		 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,
ee3bbfe8 107 struct tcf_chain *goto_chain)
85d0966f 108{
85d0966f 109 a->tcfa_action = action;
445d3749 110 goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
ee3bbfe8 111 return goto_chain;
85d0966f
DC		 112}
113EXPORT_SYMBOL(tcf_action_set_ctrlact);
114
d7fb60b9
CW		 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)
519c818e 121{
ee3bbfe8 122 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
85d0966f 123
519c818e 124 free_percpu(p->cpu_bstats);
28169aba 125 free_percpu(p->cpu_bstats_hw);
519c818e 126 free_percpu(p->cpu_qstats);
1045ba77 127
db4b4902 128 tcf_set_action_cookie(&p->user_cookie, NULL);
85d0966f
DC		 129 if (chain)
130 tcf_chain_put_by_act(chain);
1045ba77 131
519c818e
ED		 132 kfree(p);
133}
134
7adc5765
BZ		 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
13926d19
BZ		 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
8cbfe939
BZ		 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
7adc5765
BZ		 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
7adc5765
BZ		 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
8cbfe939
BZ		 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{
963178a0
BZ		 185 int err;
186
8cbfe939
BZ		 187 fl_action->extack = extack;
188 fl_action->command = cmd;
189 fl_action->index = act->tcfa_index;
d307b2c6 190 fl_action->cookie = (unsigned long)act;
8cbfe939 191
963178a0
BZ		 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,
c2ccf84e 195 false, extack);
963178a0
BZ		 196 spin_unlock_bh(&act->tcfa_lock);
197 return err;
198 }
8cbfe939
BZ		 199
200 return -EOPNOTSUPP;
201}
202
13926d19
BZ		 203static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
204 u32 *hw_count)
8cbfe939
BZ		 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
7adc5765
BZ		 213 if (hw_count)
214 *hw_count = err;
215
8cbfe939
BZ		 216 return 0;
217}
218
13926d19
BZ		 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)
8cbfe939 250{
7adc5765 251 bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
8cbfe939
BZ		 252 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
253 [0] = action,
254 };
255 struct flow_offload_action *fl_action;
7adc5765 256 u32 in_hw_count = 0;
8cbfe939
BZ		 257 int num, err = 0;
258
7adc5765
BZ		 259 if (tc_act_skip_hw(action->tcfa_flags))
260 return 0;
261
8cbfe939
BZ		 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
80cd22c3 271 err = tc_setup_action(&fl_action->action, actions, 0, extack);
8cbfe939
BZ		 272 if (err) {
273 NL_SET_ERR_MSG_MOD(extack,
ecf4a24c 274 "Failed to setup tc actions for offload");
8cbfe939
BZ		 275 goto fl_err;
276 }
277
13926d19 278 err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
7adc5765 279 if (!err)
13926d19
BZ		 280 cb ? offload_action_hw_count_inc(action, in_hw_count) :
281 offload_action_hw_count_set(action, in_hw_count);
7adc5765
BZ		 282
283 if (skip_sw && !tc_act_in_hw(action))
284 err = -EINVAL;
285
8cbfe939
BZ		 286 tc_cleanup_offload_action(&fl_action->action);
287
288fl_err:
289 kfree(fl_action);
290
291 return err;
292}
293
13926d19
BZ		 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
c7a66f8d
BZ		 301int tcf_action_update_hw_stats(struct tc_action *action)
302{
303 struct flow_offload_action fl_act = {};
304 int err;
305
c7a66f8d
BZ		 306 err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
307 if (err)
308 return err;
309
13926d19 310 err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
c7a66f8d
BZ		 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
13926d19
BZ		 329static int tcf_action_offload_del_ex(struct tc_action *action,
330 flow_indr_block_bind_cb_t *cb,
331 void *cb_priv)
8cbfe939
BZ		 332{
333 struct flow_offload_action fl_act = {};
7adc5765 334 u32 in_hw_count = 0;
8cbfe939
BZ		 335 int err = 0;
336
7adc5765
BZ		 337 if (!tc_act_in_hw(action))
338 return 0;
339
8cbfe939
BZ		 340 err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
341 if (err)
342 return err;
343
13926d19
BZ		 344 err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
345 if (err < 0)
7adc5765
BZ		 346 return err;
347
13926d19 348 if (!cb && action->in_hw_count != in_hw_count)
7adc5765
BZ		 349 return -EINVAL;
350
13926d19
BZ		 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
7adc5765 355 return 0;
8cbfe939
BZ		 356}
357
13926d19
BZ		 358static int tcf_action_offload_del(struct tc_action *action)
359{
360 return tcf_action_offload_del_ex(action, NULL, NULL);
361}
362
16af6067 363static void tcf_action_cleanup(struct tc_action *p)
e9ce1cd3 364{
8cbfe939 365 tcf_action_offload_del(p);
16af6067
VB		 366 if (p->ops->cleanup)
367 p->ops->cleanup(p);
368
1c0d32fd 369 gen_kill_estimator(&p->tcfa_rate_est);
d7fb60b9 370 free_tcf(p);
e9ce1cd3 371}
e9ce1cd3 372
16af6067
VB		 373static int __tcf_action_put(struct tc_action *p, bool bind)
374{
375 struct tcf_idrinfo *idrinfo = p->idrinfo;
376
95278dda 377 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
16af6067
VB		 378 if (bind)
379 atomic_dec(&p->tcfa_bindcnt);
380 idr_remove(&idrinfo->action_idr, p->tcfa_index);
95278dda 381 mutex_unlock(&idrinfo->lock);
16af6067
VB		 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
b3650bf7 393static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
e9ce1cd3
DM		 394{
395 int ret = 0;
396
036bb443
VB		 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 */
e9ce1cd3 409 if (p) {
16af6067 410 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
55334a5d 411 return -EPERM;
e9ce1cd3 412
16af6067 413 if (__tcf_action_put(p, bind))
1d4150c0 414 ret = ACT_P_DELETED;
e9ce1cd3 415 }
28e6b67f 416
e9ce1cd3
DM		 417 return ret;
418}
b3650bf7
VB		 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);
e9ce1cd3 431
4e76e75d
RM		 432static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
433{
db4b4902 434 struct tc_cookie *user_cookie;
4e76e75d
RM		 435 u32 cookie_len = 0;
436
e0479b67 437 rcu_read_lock();
db4b4902 438 user_cookie = rcu_dereference(act->user_cookie);
e0479b67 439
db4b4902
PB		 440 if (user_cookie)
441 cookie_len = nla_total_size(user_cookie->len);
e0479b67 442 rcu_read_unlock();
4e76e75d
RM		 443
444 return nla_total_size(0) /* action number nested */
445 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
446 + cookie_len /* TCA_ACT_COOKIE */
0dfb2d82 447 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
4e76e75d 448 + nla_total_size(0) /* TCA_ACT_STATS nested */
1521a67e 449 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
4e76e75d
RM		 450 /* TCA_STATS_BASIC */
451 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
b33e699f
ED		 452 /* TCA_STATS_PKT64 */
453 + nla_total_size_64bit(sizeof(u64))
4e76e75d
RM		 454 /* TCA_STATS_QUEUE */
455 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
fcb3a465 456 + nla_total_size(0) /* TCA_ACT_OPTIONS nested */
4e76e75d
RM		 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
94f44f28
VB		 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
fcb3a465 483 if (nla_put_string(skb, TCA_ACT_KIND, a->ops->kind))
94f44f28
VB		 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();
db4b4902 491 cookie = rcu_dereference(a->user_cookie);
94f44f28
VB		 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
83c289e8
VO		 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
65a206c0 551static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
a85a970a 552 struct netlink_callback *cb)
e9ce1cd3 553{
65a206c0 554 int err = 0, index = -1, s_i = 0, n_i = 0;
90825b23 555 u32 act_flags = cb->args[2];
e62e484d 556 unsigned long jiffy_since = cb->args[3];
4b3550ef 557 struct nlattr *nest;
65a206c0
CM		 558 struct idr *idr = &idrinfo->action_idr;
559 struct tc_action *p;
560 unsigned long id = 1;
e33d2b74 561 unsigned long tmp;
e9ce1cd3 562
95278dda 563 mutex_lock(&idrinfo->lock);
e9ce1cd3
DM		 564
565 s_i = cb->args[0];
566
e33d2b74 567 idr_for_each_entry_ul(idr, p, tmp, id) {
65a206c0
CM		 568 index++;
569 if (index < s_i)
570 continue;
580e4273
CW		 571 if (IS_ERR(p))
572 continue;
65a206c0
CM		 573
574 if (jiffy_since &&
575 time_after(jiffy_since,
576 (unsigned long)p->tcfa_tm.lastuse))
577 continue;
578
8f2ca70c
OS		 579 tcf_action_update_hw_stats(p);
580
ae0be8de 581 nest = nla_nest_start_noflag(skb, n_i);
734549eb
CD		 582 if (!nest) {
583 index--;
65a206c0 584 goto nla_put_failure;
734549eb 585 }
f460019b 586 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
94f44f28
VB		 587 tcf_action_dump_terse(skb, p, true) :
588 tcf_action_dump_1(skb, p, 0, 0);
65a206c0
CM		 589 if (err < 0) {
590 index--;
591 nlmsg_trim(skb, nest);
592 goto done;
e9ce1cd3 593 }
65a206c0
CM		 594 nla_nest_end(skb, nest);
595 n_i++;
f460019b 596 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
65a206c0
CM		 597 n_i >= TCA_ACT_MAX_PRIO)
598 goto done;
e9ce1cd3
DM		 599 }
600done:
e62e484d
JHS		 601 if (index >= 0)
602 cb->args[0] = index + 1;
603
95278dda 604 mutex_unlock(&idrinfo->lock);
90825b23 605 if (n_i) {
f460019b 606 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
90825b23
JHS		 607 cb->args[1] = n_i;
608 }
e9ce1cd3
DM		 609 return n_i;
610
7ba699c6 611nla_put_failure:
4b3550ef 612 nla_nest_cancel(skb, nest);
e9ce1cd3
DM		 613 goto done;
614}
615
ec3ed293
VB		 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
65a206c0 630static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
76b39b94
VN		 631 const struct tc_action_ops *ops,
632 struct netlink_ext_ack *extack)
e9ce1cd3 633{
4b3550ef 634 struct nlattr *nest;
65a206c0 635 int n_i = 0;
55334a5d 636 int ret = -EINVAL;
65a206c0
CM		 637 struct idr *idr = &idrinfo->action_idr;
638 struct tc_action *p;
639 unsigned long id = 1;
e33d2b74 640 unsigned long tmp;
e9ce1cd3 641
ae0be8de 642 nest = nla_nest_start_noflag(skb, 0);
4b3550ef
PM		 643 if (nest == NULL)
644 goto nla_put_failure;
fcb3a465 645 if (nla_put_string(skb, TCA_ACT_KIND, ops->kind))
1b34ec43 646 goto nla_put_failure;
65a206c0 647
76b39b94 648 ret = 0;
95278dda 649 mutex_lock(&idrinfo->lock);
e33d2b74 650 idr_for_each_entry_ul(idr, p, tmp, id) {
0fedc63f
CW		 651 if (IS_ERR(p))
652 continue;
ec3ed293 653 ret = tcf_idr_release_unsafe(p);
76b39b94 654 if (ret == ACT_P_DELETED)
255cd50f 655 module_put(ops->owner);
76b39b94
VN		 656 else if (ret < 0)
657 break;
658 n_i++;
e9ce1cd3 659 }
95278dda 660 mutex_unlock(&idrinfo->lock);
76b39b94
VN		 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 }
ec3ed293 667
55d96f72
YY		 668 ret = nla_put_u32(skb, TCA_FCNT, n_i);
669 if (ret)
1b34ec43 670 goto nla_put_failure;
4b3550ef 671 nla_nest_end(skb, nest);
e9ce1cd3
DM		 672
673 return n_i;
7ba699c6 674nla_put_failure:
4b3550ef 675 nla_nest_cancel(skb, nest);
55334a5d 676 return ret;
e9ce1cd3
DM		 677}
678
ddf97ccd
WC		 679int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
680 struct netlink_callback *cb, int type,
b3620145
AA		 681 const struct tc_action_ops *ops,
682 struct netlink_ext_ack *extack)
e9ce1cd3 683{
65a206c0 684 struct tcf_idrinfo *idrinfo = tn->idrinfo;
ddf97ccd 685
e9ce1cd3 686 if (type == RTM_DELACTION) {
76b39b94 687 return tcf_del_walker(idrinfo, skb, ops, extack);
e9ce1cd3 688 } else if (type == RTM_GETACTION) {
65a206c0 689 return tcf_dump_walker(idrinfo, skb, cb);
e9ce1cd3 690 } else {
b3620145
AA		 691 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
692 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
e9ce1cd3
DM		 693 return -EINVAL;
694 }
695}
ddf97ccd 696EXPORT_SYMBOL(tcf_generic_walker);
e9ce1cd3 697
7d485c45 698int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
e9ce1cd3 699{
3f7c72bc
VB		 700 struct tcf_idrinfo *idrinfo = tn->idrinfo;
701 struct tc_action *p;
e9ce1cd3 702
95278dda 703 mutex_lock(&idrinfo->lock);
322d884b 704 p = idr_find(&idrinfo->action_idr, index);
7d485c45 705 if (IS_ERR(p))
0190c1d4 706 p = NULL;
7d485c45 707 else if (p)
3f7c72bc 708 refcount_inc(&p->tcfa_refcnt);
95278dda 709 mutex_unlock(&idrinfo->lock);
e9ce1cd3 710
3f7c72bc
VB		 711 if (p) {
712 *a = p;
713 return true;
714 }
715 return false;
e9ce1cd3 716}
65a206c0 717EXPORT_SYMBOL(tcf_idr_search);
e9ce1cd3 718
fae52d93
ZS		 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
97a3f84f 744static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
2a2ea349 745{
2a2ea349
VB		 746 struct tc_action *p;
747 int ret = 0;
748
95278dda 749 mutex_lock(&idrinfo->lock);
2a2ea349
VB		 750 p = idr_find(&idrinfo->action_idr, index);
751 if (!p) {
95278dda 752 mutex_unlock(&idrinfo->lock);
2a2ea349
VB		 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));
95278dda 762 mutex_unlock(&idrinfo->lock);
2a2ea349 763
16af6067 764 tcf_action_cleanup(p);
2a2ea349
VB		 765 module_put(owner);
766 return 0;
767 }
768 ret = 0;
769 } else {
770 ret = -EPERM;
771 }
772
95278dda 773 mutex_unlock(&idrinfo->lock);
2a2ea349
VB		 774 return ret;
775}
2a2ea349 776
65a206c0
CM		 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,
e3822678 779 int bind, bool cpustats, u32 flags)
e9ce1cd3 780{
ec0595cc 781 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
65a206c0 782 struct tcf_idrinfo *idrinfo = tn->idrinfo;
519c818e 783 int err = -ENOMEM;
e9ce1cd3
DM		 784
785 if (unlikely(!p))
86062033 786 return -ENOMEM;
036bb443 787 refcount_set(&p->tcfa_refcnt, 1);
e9ce1cd3 788 if (bind)
036bb443 789 atomic_set(&p->tcfa_bindcnt, 1);
e9ce1cd3 790
519c818e 791 if (cpustats) {
50dc9a85 792 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
339913a8 793 if (!p->cpu_bstats)
519c818e 794 goto err1;
50dc9a85 795 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
28169aba
EC		 796 if (!p->cpu_bstats_hw)
797 goto err2;
339913a8
MW		 798 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
799 if (!p->cpu_qstats)
28169aba 800 goto err3;
519c818e 801 }
50dc9a85
AD		 802 gnet_stats_basic_sync_init(&p->tcfa_bstats);
803 gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
ec0595cc 804 spin_lock_init(&p->tcfa_lock);
339913a8 805 p->tcfa_index = index;
ec0595cc
WC		 806 p->tcfa_tm.install = jiffies;
807 p->tcfa_tm.lastuse = jiffies;
808 p->tcfa_tm.firstuse = 0;
e8cb5bcf 809 p->tcfa_flags = flags;
0e991ec6 810 if (est) {
ec0595cc
WC		 811 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
812 &p->tcfa_rate_est,
29cbcd85 813 &p->tcfa_lock, false, est);
339913a8 814 if (err)
28169aba 815 goto err4;
0e991ec6
SH		 816 }
817
65a206c0 818 p->idrinfo = idrinfo;
b3650bf7 819 __module_get(ops->owner);
ec0595cc 820 p->ops = ops;
ec0595cc 821 *a = p;
86062033 822 return 0;
28169aba 823err4:
339913a8 824 free_percpu(p->cpu_qstats);
28169aba
EC		 825err3:
826 free_percpu(p->cpu_bstats_hw);
339913a8
MW		 827err2:
828 free_percpu(p->cpu_bstats);
829err1:
830 kfree(p);
831 return err;
e9ce1cd3 832}
65a206c0 833EXPORT_SYMBOL(tcf_idr_create);
e9ce1cd3 834
e3822678
VB		 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
0190c1d4
VB		 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
95278dda 852 mutex_lock(&idrinfo->lock);
0190c1d4
VB		 853 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
854 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
95278dda 855 mutex_unlock(&idrinfo->lock);
0190c1d4
VB		 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.
4b55e867
PT		 863 *
864 * May return -EAGAIN for binding actions in case of a parallel add/delete on
865 * the requested index.
0190c1d4
VB		 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;
4b55e867 874 u32 max;
0190c1d4 875
0190c1d4 876 if (*index) {
4b55e867 877 rcu_read_lock();
0190c1d4 878 p = idr_find(&idrinfo->action_idr, *index);
4b55e867 879
0190c1d4
VB		 880 if (IS_ERR(p)) {
881 /* This means that another process allocated
882 * index but did not assign the pointer yet.
883 */
4b55e867 884 rcu_read_unlock();
d8643198 885 return -EAGAIN;
0190c1d4
VB		 886 }
887
4b55e867
PT		 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;
0190c1d4 899 }
4b55e867
PT		 900
901 if (bind)
902 atomic_inc(&p->tcfa_bindcnt);
903 *a = p;
904
905 rcu_read_unlock();
906
907 return 1;
0190c1d4 908 } else {
4b55e867 909 /* Find a slot */
0190c1d4 910 *index = 1;
4b55e867 911 max = UINT_MAX;
0190c1d4 912 }
4b55e867
PT		 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);
95278dda 920 mutex_unlock(&idrinfo->lock);
4b55e867
PT		 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
0190c1d4
VB		 928 return ret;
929}
930EXPORT_SYMBOL(tcf_idr_check_alloc);
931
65a206c0
CM		 932void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
933 struct tcf_idrinfo *idrinfo)
1d4150c0 934{
65a206c0
CM		 935 struct idr *idr = &idrinfo->action_idr;
936 struct tc_action *p;
937 int ret;
938 unsigned long id = 1;
e33d2b74 939 unsigned long tmp;
1d4150c0 940
e33d2b74 941 idr_for_each_entry_ul(idr, p, tmp, id) {
65a206c0
CM		 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;
1d4150c0 947 }
65a206c0 948 idr_destroy(&idrinfo->action_idr);
1d4150c0 949}
65a206c0 950EXPORT_SYMBOL(tcf_idrinfo_destroy);
1d4150c0 951
1f747c26 952static LIST_HEAD(act_base);
1da177e4 953static DEFINE_RWLOCK(act_mod_lock);
13926d19
BZ		 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}
1da177e4 1007
ddf97ccd
WC		 1008int tcf_register_action(struct tc_action_ops *act,
1009 struct pernet_operations *ops)
1da177e4 1010{
1f747c26 1011 struct tc_action_ops *a;
ddf97ccd 1012 int ret;
1da177e4 1013
fae52d93 1014 if (!act->act || !act->dump || !act->init)
76c82d7a
JHS		 1015 return -EINVAL;
1016
ab102b80
WC		 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
13926d19
BZ		 1025 if (ops->id) {
1026 ret = tcf_pernet_add_id_list(*ops->id);
1027 if (ret)
1028 goto err_id;
1029 }
1030
1da177e4 1031 write_lock(&act_mod_lock);
1f747c26 1032 list_for_each_entry(a, &act_base, head) {
eddd2cf1 1033 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
13926d19
BZ		 1034 ret = -EEXIST;
1035 goto err_out;
1da177e4
LT		 1036 }
1037 }
1f747c26 1038 list_add_tail(&act->head, &act_base);
1da177e4 1039 write_unlock(&act_mod_lock);
ddf97ccd 1040
1da177e4 1041 return 0;
13926d19
BZ		 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;
1da177e4 1050}
62e3ba1b 1051EXPORT_SYMBOL(tcf_register_action);
1da177e4 1052
ddf97ccd
WC		 1053int tcf_unregister_action(struct tc_action_ops *act,
1054 struct pernet_operations *ops)
1da177e4 1055{
1f747c26 1056 struct tc_action_ops *a;
1da177e4
LT		 1057 int err = -ENOENT;
1058
1059 write_lock(&act_mod_lock);
a792866a
ED		 1060 list_for_each_entry(a, &act_base, head) {
1061 if (a == act) {
1062 list_del(&act->head);
1063 err = 0;
1da177e4 1064 break;
a792866a 1065 }
1da177e4
LT		 1066 }
1067 write_unlock(&act_mod_lock);
13926d19 1068 if (!err) {
ab102b80 1069 unregister_pernet_subsys(ops);
13926d19
BZ		 1070 if (ops->id)
1071 tcf_pernet_del_id_list(*ops->id);
1072 }
1da177e4
LT		 1073 return err;
1074}
62e3ba1b 1075EXPORT_SYMBOL(tcf_unregister_action);
1da177e4
LT		 1076
1077/* lookup by name */
1078static struct tc_action_ops *tc_lookup_action_n(char *kind)
1079{
a792866a 1080 struct tc_action_ops *a, *res = NULL;
1da177e4
LT		 1081
1082 if (kind) {
1083 read_lock(&act_mod_lock);
1f747c26 1084 list_for_each_entry(a, &act_base, head) {
1da177e4 1085 if (strcmp(kind, a->kind) == 0) {
a792866a
ED		 1086 if (try_module_get(a->owner))
1087 res = a;
1da177e4
LT		 1088 break;
1089 }
1090 }
1091 read_unlock(&act_mod_lock);
1092 }
a792866a 1093 return res;
1da177e4
LT		 1094}
1095
7ba699c6
PM		 1096/* lookup by nlattr */
1097static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1da177e4 1098{
a792866a 1099 struct tc_action_ops *a, *res = NULL;
1da177e4
LT		 1100
1101 if (kind) {
1102 read_lock(&act_mod_lock);
1f747c26 1103 list_for_each_entry(a, &act_base, head) {
7ba699c6 1104 if (nla_strcmp(kind, a->kind) == 0) {
a792866a
ED		 1105 if (try_module_get(a->owner))
1106 res = a;
1da177e4
LT		 1107 break;
1108 }
1109 }
1110 read_unlock(&act_mod_lock);
1111 }
a792866a 1112 return res;
1da177e4 1113}
1da177e4 1114
e5a4b17d 1115/*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
e0ee84de 1116#define TCA_ACT_MAX_PRIO_MASK 0x1FF
22dc13c8
WC		 1117int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1118 int nr_actions, struct tcf_result *res)
1da177e4 1119{
e0ee84de
JHS		 1120 u32 jmp_prgcnt = 0;
1121 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
ec1a9cca
JP		 1122 int i;
1123 int ret = TC_ACT_OK;
1da177e4 1124
e7246e12
WB		 1125 if (skb_skip_tc_classify(skb))
1126 return TC_ACT_OK;
1127
e0ee84de 1128restart_act_graph:
22dc13c8
WC		 1129 for (i = 0; i < nr_actions; i++) {
1130 const struct tc_action *a = actions[i];
5740d068 1131 int repeat_ttl;
22dc13c8 1132
e0ee84de
JHS		 1133 if (jmp_prgcnt > 0) {
1134 jmp_prgcnt -= 1;
1135 continue;
1136 }
7adc5765
BZ		 1137
1138 if (tc_act_skip_sw(a->tcfa_flags))
1139 continue;
5740d068
ED		 1140
1141 repeat_ttl = 32;
1da177e4 1142repeat:
871cf386 1143 ret = tc_act(skb, a, res);
5740d068
ED		 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 }
9da3242e 1151 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
e0ee84de
JHS		 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 }
db50514f 1163 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
ee3bbfe8 1164 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
4cf24dc8
VN		 1165 tcf_set_drop_reason(skb,
1166 SKB_DROP_REASON_TC_CHAIN_NOTFOUND);
ee3bbfe8
DC		 1167 return TC_ACT_SHOT;
1168 }
db50514f 1169 tcf_action_goto_chain_exec(a, res);
e0ee84de
JHS		 1170 }
1171
63acd680 1172 if (ret != TC_ACT_PIPE)
e7246e12 1173 break;
1da177e4 1174 }
e0ee84de 1175
1da177e4
LT		 1176 return ret;
1177}
62e3ba1b 1178EXPORT_SYMBOL(tcf_action_exec);
1da177e4 1179
90b73b77 1180int tcf_action_destroy(struct tc_action *actions[], int bind)
1da177e4 1181{
255cd50f 1182 const struct tc_action_ops *ops;
90b73b77
VB		 1183 struct tc_action *a;
1184 int ret = 0, i;
1da177e4 1185
3872347e 1186 tcf_act_for_each_action(i, a, actions) {
90b73b77 1187 actions[i] = NULL;
255cd50f 1188 ops = a->ops;
65a206c0 1189 ret = __tcf_idr_release(a, bind, true);
55334a5d 1190 if (ret == ACT_P_DELETED)
255cd50f 1191 module_put(ops->owner);
55334a5d
WC		 1192 else if (ret < 0)
1193 return ret;
1da177e4 1194 }
55334a5d 1195 return ret;
1da177e4
LT		 1196}
1197
16af6067
VB		 1198static int tcf_action_put(struct tc_action *p)
1199{
1200 return __tcf_action_put(p, false);
1201}
1202
90b73b77 1203static void tcf_action_put_many(struct tc_action *actions[])
cae422f3 1204{
a0e947c9 1205 struct tc_action *a;
90b73b77 1206 int i;
cae422f3 1207
a0e947c9
PT		 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}
cae422f3 1214
a0e947c9
PT		 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)
edfaf94f 1224 continue;
a0e947c9 1225
cae422f3
VB		 1226 if (tcf_action_put(a))
1227 module_put(ops->owner);
1228 }
1229}
1230
1da177e4
LT		 1231int
1232tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1233{
1da177e4
LT		 1234 return a->ops->dump(skb, a, bind, ref);
1235}
1236
90b73b77 1237int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
ca44b738 1238 int bind, int ref, bool terse)
1da177e4
LT		 1239{
1240 struct tc_action *a;
90b73b77 1241 int err = -EINVAL, i;
4b3550ef 1242 struct nlattr *nest;
1da177e4 1243
3872347e 1244 tcf_act_for_each_action(i, a, actions) {
4097e9d2 1245 nest = nla_nest_start_noflag(skb, i + 1);
4b3550ef
PM		 1246 if (nest == NULL)
1247 goto nla_put_failure;
94f44f28 1248 err = terse ? tcf_action_dump_terse(skb, a, false) :
ca44b738 1249 tcf_action_dump_1(skb, a, bind, ref);
1da177e4 1250 if (err < 0)
4fe683f5 1251 goto errout;
4b3550ef 1252 nla_nest_end(skb, nest);
1da177e4
LT		 1253 }
1254
1255 return 0;
1256
7ba699c6 1257nla_put_failure:
4fe683f5
TG		 1258 err = -EINVAL;
1259errout:
4b3550ef 1260 nla_nest_cancel(skb, nest);
4fe683f5 1261 return err;
1da177e4
LT		 1262}
1263
e0535ce5 1264static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1045ba77 1265{
e0535ce5
WB		 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;
1045ba77 1274 }
e0535ce5 1275 c->len = nla_len(tb[TCA_ACT_COOKIE]);
1045ba77 1276
e0535ce5 1277 return c;
1045ba77
JHS		 1278}
1279
0dfb2d82 1280static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
44f86580 1281{
0dfb2d82 1282 struct nla_bitfield32 hw_stats_bf;
44f86580
JP		 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 */
0dfb2d82
JK		 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;
44f86580
JP		 1292}
1293
199ce850 1294static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
4b793fec 1295 [TCA_ACT_KIND] = { .type = NLA_STRING },
199ce850
CW		 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 },
7adc5765
BZ		 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),
47a1494b 1303 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
199ce850
CW		 1304};
1305
1dd7f18f 1306void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
e49d8c22 1307{
f9bfc8eb 1308 struct tc_action *a;
0fedc63f 1309 int i;
e49d8c22 1310
f9bfc8eb 1311 tcf_act_for_each_action(i, a, actions) {
0fedc63f
CW		 1312 struct tcf_idrinfo *idrinfo;
1313
c2a67de9 1314 if (init_res[i] == ACT_P_BOUND)
1dd7f18f
PT		 1315 continue;
1316
0fedc63f
CW		 1317 idrinfo = a->idrinfo;
1318 mutex_lock(&idrinfo->lock);
1dd7f18f 1319 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
0fedc63f
CW		 1320 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1321 mutex_unlock(&idrinfo->lock);
1322 }
e49d8c22
CW		 1323}
1324
405cd9fc 1325struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
d349f997 1326 struct netlink_ext_ack *extack)
1da177e4 1327{
405cd9fc 1328 bool police = flags & TCA_ACT_FLAGS_POLICE;
d349f997 1329 struct nlattr *tb[TCA_ACT_MAX + 1];
1da177e4
LT		 1330 struct tc_action_ops *a_o;
1331 char act_name[IFNAMSIZ];
7ba699c6 1332 struct nlattr *kind;
ab27cfb8 1333 int err;
1da177e4 1334
695176bf 1335 if (!police) {
199ce850
CW		 1336 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1337 tcf_action_policy, extack);
cee63723 1338 if (err < 0)
d349f997 1339 return ERR_PTR(err);
cee63723 1340 err = -EINVAL;
7ba699c6 1341 kind = tb[TCA_ACT_KIND];
84ae017a
AA		 1342 if (!kind) {
1343 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
d349f997 1344 return ERR_PTR(err);
84ae017a 1345 }
872f6903 1346 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
4b793fec 1347 NL_SET_ERR_MSG(extack, "TC action name too long");
d349f997 1348 return ERR_PTR(err);
4b793fec 1349 }
1da177e4 1350 } else {
989b52cd 1351 if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
84ae017a 1352 NL_SET_ERR_MSG(extack, "TC action name too long");
d349f997 1353 return ERR_PTR(-EINVAL);
84ae017a 1354 }
1da177e4
LT		 1355 }
1356
1357 a_o = tc_lookup_action_n(act_name);
1358 if (a_o == NULL) {
95a5afca 1359#ifdef CONFIG_MODULES
405cd9fc
PT		 1360 bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL);
1361
789871bb
VB		 1362 if (rtnl_held)
1363 rtnl_unlock();
2c15a5ae 1364 request_module(NET_ACT_ALIAS_PREFIX "%s", act_name);
789871bb
VB		 1365 if (rtnl_held)
1366 rtnl_lock();
1da177e4
LT		 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) {
d349f997
CW		 1377 module_put(a_o->owner);
1378 return ERR_PTR(-EAGAIN);
1da177e4
LT		 1379 }
1380#endif
84ae017a 1381 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
d349f997 1382 return ERR_PTR(-ENOENT);
1da177e4
LT		 1383 }
1384
d349f997
CW		 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,
87c750e8 1390 struct tc_action_ops *a_o, int *init_res,
695176bf 1391 u32 flags, struct netlink_ext_ack *extack)
d349f997 1392{
695176bf
CW		 1393 bool police = flags & TCA_ACT_FLAGS_POLICE;
1394 struct nla_bitfield32 userflags = { 0, 0 };
db4b4902 1395 struct tc_cookie *user_cookie = NULL;
d349f997
CW		 1396 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1397 struct nlattr *tb[TCA_ACT_MAX + 1];
d349f997
CW		 1398 struct tc_action *a;
1399 int err;
1400
1da177e4 1401 /* backward compatibility for policer */
695176bf 1402 if (!police) {
d349f997
CW		 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]) {
db4b4902
PB		 1408 user_cookie = nla_memdup_cookie(tb);
1409 if (!user_cookie) {
d349f997
CW		 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]);
7adc5765 1416 if (tb[TCA_ACT_FLAGS]) {
695176bf 1417 userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
7adc5765
BZ		 1418 if (!tc_act_flags_valid(userflags.value)) {
1419 err = -EINVAL;
1420 goto err_out;
1421 }
1422 }
d349f997 1423
695176bf
CW		 1424 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1425 userflags.value | flags, extack);
d349f997 1426 } else {
695176bf
CW		 1427 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1428 extack);
d349f997 1429 }
ab27cfb8 1430 if (err < 0)
d349f997 1431 goto err_out;
87c750e8 1432 *init_res = err;
1da177e4 1433
695176bf 1434 if (!police && tb[TCA_ACT_COOKIE])
db4b4902 1435 tcf_set_action_cookie(&a->user_cookie, user_cookie);
1045ba77 1436
695176bf 1437 if (!police)
0dfb2d82 1438 a->hw_stats = hw_stats;
44f86580 1439
1da177e4
LT		 1440 return a;
1441
d349f997 1442err_out:
db4b4902
PB		 1443 if (user_cookie) {
1444 kfree(user_cookie->data);
1445 kfree(user_cookie);
e0535ce5 1446 }
ab27cfb8 1447 return ERR_PTR(err);
1da177e4
LT		 1448}
1449
8cbfe939
BZ		 1450static bool tc_act_bind(u32 flags)
1451{
1452 return !!(flags & TCA_ACT_FLAGS_BIND);
1453}
1454
90b73b77
VB		 1455/* Returns numbers of initialized actions or negative error. */
1456
9fb9f251 1457int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
695176bf 1458 struct nlattr *est, struct tc_action *actions[],
c86e0209
BZ		 1459 int init_res[], size_t *attr_size,
1460 u32 flags, u32 fl_flags,
695176bf 1461 struct netlink_ext_ack *extack)
1da177e4 1462{
d349f997 1463 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
5f5f9291 1464 struct nlattr *tb[TCA_ACT_MAX_PRIO + 2];
33be6271 1465 struct tc_action *act;
4e76e75d 1466 size_t sz = 0;
cee63723 1467 int err;
1da177e4
LT		 1468 int i;
1469
5f5f9291 1470 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO + 1, nla, NULL,
8cb08174 1471 extack);
cee63723 1472 if (err < 0)
33be6271 1473 return err;
1da177e4 1474
5f5f9291
THJ		 1475 /* The nested attributes are parsed as types, but they are really an
1476 * array of actions. So we parse one more than we can handle, and return
1477 * an error if the last one is set (as that indicates that the request
1478 * contained more than the maximum number of actions).
1479 */
1480 if (tb[TCA_ACT_MAX_PRIO + 1]) {
1481 NL_SET_ERR_MSG_FMT(extack,
1482 "Only %d actions supported per filter",
1483 TCA_ACT_MAX_PRIO);
1484 return -EINVAL;
1485 }
1486
d349f997
CW		 1487 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1488 struct tc_action_ops *a_o;
1489
405cd9fc 1490 a_o = tc_action_load_ops(tb[i], flags, extack);
d349f997
CW		 1491 if (IS_ERR(a_o)) {
1492 err = PTR_ERR(a_o);
1493 goto err_mod;
1494 }
1495 ops[i - 1] = a_o;
1496 }
1497
7ba699c6 1498 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
695176bf
CW		 1499 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1500 &init_res[i - 1], flags, extack);
33be6271
WC		 1501 if (IS_ERR(act)) {
1502 err = PTR_ERR(act);
1da177e4 1503 goto err;
33be6271 1504 }
4e76e75d 1505 sz += tcf_action_fill_size(act);
90b73b77
VB		 1506 /* Start from index 0 */
1507 actions[i - 1] = act;
c86e0209
BZ		 1508 if (tc_act_bind(flags)) {
1509 bool skip_sw = tc_skip_sw(fl_flags);
1510 bool skip_hw = tc_skip_hw(fl_flags);
1511
34d35b4e
VO		 1512 if (tc_act_bind(act->tcfa_flags)) {
1513 /* Action is created by classifier and is not
1514 * standalone. Check that the user did not set
1515 * any action flags different than the
1516 * classifier flags, and inherit the flags from
1517 * the classifier for the compatibility case
1518 * where no flags were specified at all.
1519 */
1520 if ((tc_act_skip_sw(act->tcfa_flags) && !skip_sw) ||
1521 (tc_act_skip_hw(act->tcfa_flags) && !skip_hw)) {
1522 NL_SET_ERR_MSG(extack,
1523 "Mismatch between action and filter offload flags");
1524 err = -EINVAL;
1525 goto err;
1526 }
1527 if (skip_sw)
1528 act->tcfa_flags |= TCA_ACT_FLAGS_SKIP_SW;
1529 if (skip_hw)
1530 act->tcfa_flags |= TCA_ACT_FLAGS_SKIP_HW;
c86e0209 1531 continue;
34d35b4e
VO		 1532 }
1533
1534 /* Action is standalone */
c86e0209
BZ		 1535 if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1536 skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
d922a99b
BZ		 1537 NL_SET_ERR_MSG(extack,
1538 "Mismatch between action and filter offload flags");
c86e0209
BZ		 1539 err = -EINVAL;
1540 goto err;
1541 }
1542 } else {
7adc5765
BZ		 1543 err = tcf_action_offload_add(act, extack);
1544 if (tc_act_skip_sw(act->tcfa_flags) && err)
1545 goto err;
1546 }
1da177e4 1547 }
aecc5cef 1548
0fedc63f
CW		 1549 /* We have to commit them all together, because if any error happened in
1550 * between, we could not handle the failure gracefully.
1551 */
1dd7f18f 1552 tcf_idr_insert_many(actions, init_res);
0fedc63f 1553
4e76e75d 1554 *attr_size = tcf_action_full_attrs_size(sz);
b3650bf7
VB		 1555 err = i - 1;
1556 goto err_mod;
1da177e4
LT		 1557
1558err:
695176bf 1559 tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
d349f997 1560err_mod:
e09ac779
PT		 1561 for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++)
1562 module_put(ops[i]->owner);
33be6271 1563 return err;
1da177e4
LT		 1564}
1565
4b61d3e8
PL		 1566void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1567 u64 drops, bool hw)
c8ecebd0 1568{
5e174d5e 1569 if (a->cpu_bstats) {
50dc9a85 1570 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
c8ecebd0 1571
4b61d3e8 1572 this_cpu_ptr(a->cpu_qstats)->drops += drops;
5e174d5e
VB		 1573
1574 if (hw)
50dc9a85
AD		 1575 _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1576 bytes, packets);
5e174d5e
VB		 1577 return;
1578 }
c8ecebd0 1579
5e174d5e 1580 _bstats_update(&a->tcfa_bstats, bytes, packets);
4b61d3e8 1581 a->tcfa_qstats.drops += drops;
c8ecebd0 1582 if (hw)
5e174d5e 1583 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
c8ecebd0
VB		 1584}
1585EXPORT_SYMBOL(tcf_action_update_stats);
1586
ec0595cc 1587int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1da177e4
LT		 1588 int compat_mode)
1589{
1590 int err = 0;
1591 struct gnet_dump d;
10297b99 1592
7eb8896d 1593 if (p == NULL)
1da177e4
LT		 1594 goto errout;
1595
1596 /* compat_mode being true specifies a call that is supposed
06fe9fb4 1597 * to add additional backward compatibility statistic TLVs.
1da177e4
LT		 1598 */
1599 if (compat_mode) {
ec0595cc 1600 if (p->type == TCA_OLD_COMPAT)
1da177e4 1601 err = gnet_stats_start_copy_compat(skb, 0,
9854518e
ND		 1602 TCA_STATS,
1603 TCA_XSTATS,
ec0595cc 1604 &p->tcfa_lock, &d,
9854518e 1605 TCA_PAD);
1da177e4
LT		 1606 else
1607 return 0;
1608 } else
1609 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
ec0595cc 1610 &p->tcfa_lock, &d, TCA_ACT_PAD);
1da177e4
LT		 1611
1612 if (err < 0)
1613 goto errout;
1614
29cbcd85
AD		 1615 if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1616 &p->tcfa_bstats, false) < 0 ||
1617 gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1618 &p->tcfa_bstats_hw, false) < 0 ||
1c0d32fd 1619 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
519c818e 1620 gnet_stats_copy_queue(&d, p->cpu_qstats,
ec0595cc
WC		 1621 &p->tcfa_qstats,
1622 p->tcfa_qstats.qlen) < 0)
1da177e4
LT		 1623 goto errout;
1624
1625 if (gnet_stats_finish_copy(&d) < 0)
1626 goto errout;
1627
1628 return 0;
1629
1630errout:
1631 return -1;
1632}
1633
90b73b77 1634static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
0b0f43fe 1635 u32 portid, u32 seq, u16 flags, int event, int bind,
0349b877 1636 int ref, struct netlink_ext_ack *extack)
1da177e4
LT		 1637{
1638 struct tcamsg *t;
1639 struct nlmsghdr *nlh;
27a884dc 1640 unsigned char *b = skb_tail_pointer(skb);
4b3550ef 1641 struct nlattr *nest;
1da177e4 1642
15e47304 1643 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
8b00a53c
DM		 1644 if (!nlh)
1645 goto out_nlmsg_trim;
1646 t = nlmsg_data(nlh);
1da177e4 1647 t->tca_family = AF_UNSPEC;
9ef1d4c7
PM		 1648 t->tca__pad1 = 0;
1649 t->tca__pad2 = 0;
10297b99 1650
2f59823f
HL		 1651 if (extack && extack->_msg &&
1652 nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg))
1653 goto out_nlmsg_trim;
1654
ae0be8de 1655 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1af85155 1656 if (!nest)
8b00a53c 1657 goto out_nlmsg_trim;
1da177e4 1658
ca44b738 1659 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
8b00a53c 1660 goto out_nlmsg_trim;
1da177e4 1661
8de2bd02
HL		 1662 nla_nest_end(skb, nest);
1663
27a884dc 1664 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
0349b877 1665
1da177e4
LT		 1666 return skb->len;
1667
8b00a53c 1668out_nlmsg_trim:
dc5fc579 1669 nlmsg_trim(skb, b);
1da177e4
LT		 1670 return -1;
1671}
1672
1673static int
c4c4290c 1674tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
90b73b77 1675 struct tc_action *actions[], int event,
84ae017a 1676 struct netlink_ext_ack *extack)
1da177e4
LT		 1677{
1678 struct sk_buff *skb;
1da177e4
LT		 1679
1680 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1681 if (!skb)
1682 return -ENOBUFS;
0b0f43fe 1683 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
0349b877 1684 0, 1, NULL) <= 0) {
84ae017a 1685 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1da177e4
LT		 1686 kfree_skb(skb);
1687 return -EINVAL;
1688 }
2942e900 1689
15e47304 1690 return rtnl_unicast(skb, net, portid);
1da177e4
LT		 1691}
1692
ddf97ccd 1693static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
84ae017a
AA		 1694 struct nlmsghdr *n, u32 portid,
1695 struct netlink_ext_ack *extack)
1da177e4 1696{
cc7ec456 1697 struct nlattr *tb[TCA_ACT_MAX + 1];
a85a970a 1698 const struct tc_action_ops *ops;
1da177e4
LT		 1699 struct tc_action *a;
1700 int index;
ab27cfb8 1701 int err;
1da177e4 1702
199ce850
CW		 1703 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1704 tcf_action_policy, extack);
cee63723 1705 if (err < 0)
ab27cfb8 1706 goto err_out;
1da177e4 1707
cee63723 1708 err = -EINVAL;
7ba699c6 1709 if (tb[TCA_ACT_INDEX] == NULL ||
84ae017a
AA		 1710 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1711 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
ab27cfb8 1712 goto err_out;
84ae017a 1713 }
1587bac4 1714 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1da177e4 1715
ab27cfb8 1716 err = -EINVAL;
a85a970a 1717 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
84ae017a 1718 if (!ops) { /* could happen in batch of actions */
f061b48c 1719 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
a85a970a 1720 goto err_out;
84ae017a 1721 }
ab27cfb8 1722 err = -ENOENT;
fae52d93 1723 if (__tcf_idr_search(net, ops, &a, index) == 0) {
f061b48c 1724 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1da177e4 1725 goto err_mod;
f061b48c 1726 }
1da177e4 1727
a85a970a 1728 module_put(ops->owner);
1da177e4 1729 return a;
ab27cfb8 1730
1da177e4 1731err_mod:
a85a970a 1732 module_put(ops->owner);
ab27cfb8
PM		 1733err_out:
1734 return ERR_PTR(err);
1da177e4
LT		 1735}
1736
7316ae88 1737static int tca_action_flush(struct net *net, struct nlattr *nla,
84ae017a
AA		 1738 struct nlmsghdr *n, u32 portid,
1739 struct netlink_ext_ack *extack)
1da177e4
LT		 1740{
1741 struct sk_buff *skb;
1742 unsigned char *b;
1743 struct nlmsghdr *nlh;
1744 struct tcamsg *t;
1745 struct netlink_callback dcb;
4b3550ef 1746 struct nlattr *nest;
cc7ec456 1747 struct nlattr *tb[TCA_ACT_MAX + 1];
a85a970a 1748 const struct tc_action_ops *ops;
7ba699c6 1749 struct nlattr *kind;
36723873 1750 int err = -ENOMEM;
1da177e4 1751
1da177e4 1752 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
84ae017a 1753 if (!skb)
36723873 1754 return err;
1da177e4 1755
27a884dc 1756 b = skb_tail_pointer(skb);
1da177e4 1757
199ce850
CW		 1758 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1759 tcf_action_policy, extack);
cee63723 1760 if (err < 0)
1da177e4
LT		 1761 goto err_out;
1762
cee63723 1763 err = -EINVAL;
7ba699c6 1764 kind = tb[TCA_ACT_KIND];
a85a970a 1765 ops = tc_lookup_action(kind);
84ae017a
AA		 1766 if (!ops) { /*some idjot trying to flush unknown action */
1767 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1da177e4 1768 goto err_out;
84ae017a 1769 }
1da177e4 1770
0b0f43fe
JHS		 1771 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1772 sizeof(*t), 0);
84ae017a
AA		 1773 if (!nlh) {
1774 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
8b00a53c 1775 goto out_module_put;
84ae017a 1776 }
8b00a53c 1777 t = nlmsg_data(nlh);
1da177e4 1778 t->tca_family = AF_UNSPEC;
9ef1d4c7
PM		 1779 t->tca__pad1 = 0;
1780 t->tca__pad2 = 0;
1da177e4 1781
ae0be8de 1782 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
84ae017a
AA		 1783 if (!nest) {
1784 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
8b00a53c 1785 goto out_module_put;
84ae017a 1786 }
1da177e4 1787
fae52d93 1788 err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack);
66dede2d
DC		 1789 if (err <= 0) {
1790 nla_nest_cancel(skb, nest);
8b00a53c 1791 goto out_module_put;
66dede2d 1792 }
1da177e4 1793
4b3550ef 1794 nla_nest_end(skb, nest);
1da177e4 1795
27a884dc 1796 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1da177e4 1797 nlh->nlmsg_flags |= NLM_F_ROOT;
a85a970a 1798 module_put(ops->owner);
15e47304 1799 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
cc7ec456 1800 n->nlmsg_flags & NLM_F_ECHO);
84ae017a
AA		 1801 if (err < 0)
1802 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1da177e4
LT		 1803
1804 return err;
1805
8b00a53c 1806out_module_put:
a85a970a 1807 module_put(ops->owner);
1da177e4
LT		 1808err_out:
1809 kfree_skb(skb);
1da177e4
LT		 1810 return err;
1811}
1812
b144e7ec 1813static int tcf_action_delete(struct net *net, struct tc_action *actions[])
16af6067 1814{
3872347e 1815 struct tc_action *a;
97a3f84f 1816 int i;
16af6067 1817
3872347e 1818 tcf_act_for_each_action(i, a, actions) {
16af6067 1819 const struct tc_action_ops *ops = a->ops;
16af6067
VB		 1820 /* Actions can be deleted concurrently so we must save their
1821 * type and id to search again after reference is released.
1822 */
97a3f84f
CW		 1823 struct tcf_idrinfo *idrinfo = a->idrinfo;
1824 u32 act_index = a->tcfa_index;
16af6067 1825
c10bbfae 1826 actions[i] = NULL;
16af6067
VB		 1827 if (tcf_action_put(a)) {
1828 /* last reference, action was deleted concurrently */
1829 module_put(ops->owner);
3872347e 1830 } else {
97a3f84f
CW		 1831 int ret;
1832
16af6067 1833 /* now do the delete */
97a3f84f 1834 ret = tcf_idr_delete_index(idrinfo, act_index);
edfaf94f 1835 if (ret < 0)
16af6067
VB		 1836 return ret;
1837 }
1838 }
1839 return 0;
1840}
1841
8d4390f5
PT		 1842static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net,
1843 struct tc_action *action)
13926d19
BZ		 1844{
1845 size_t attr_size = tcf_action_fill_size(action);
1846 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1847 [0] = action,
1848 };
13926d19 1849 struct sk_buff *skb;
13926d19 1850
c73724bf 1851 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
13926d19 1852 if (!skb)
8d4390f5 1853 return ERR_PTR(-ENOBUFS);
13926d19 1854
0349b877 1855 if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) {
13926d19 1856 kfree_skb(skb);
8d4390f5
PT		 1857 return ERR_PTR(-EINVAL);
1858 }
1859
1860 return skb;
1861}
1862
1863static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1864{
1865 const struct tc_action_ops *ops = action->ops;
1866 struct sk_buff *skb;
1867 int ret;
1868
1869 if (!rtnl_notify_needed(net, 0, RTNLGRP_TC)) {
1870 skb = NULL;
1871 } else {
1872 skb = tcf_reoffload_del_notify_msg(net, action);
1873 if (IS_ERR(skb))
1874 return PTR_ERR(skb);
13926d19
BZ		 1875 }
1876
1877 ret = tcf_idr_release_unsafe(action);
1878 if (ret == ACT_P_DELETED) {
1879 module_put(ops->owner);
8d4390f5 1880 ret = rtnetlink_maybe_send(skb, net, 0, RTNLGRP_TC, 0);
13926d19
BZ		 1881 } else {
1882 kfree_skb(skb);
1883 }
1884
1885 return ret;
1886}
1887
1888int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1889 void *cb_priv, bool add)
1890{
1891 struct tc_act_pernet_id *id_ptr;
1892 struct tcf_idrinfo *idrinfo;
1893 struct tc_action_net *tn;
1894 struct tc_action *p;
1895 unsigned int act_id;
1896 unsigned long tmp;
1897 unsigned long id;
1898 struct idr *idr;
1899 struct net *net;
1900 int ret;
1901
1902 if (!cb)
1903 return -EINVAL;
1904
1905 down_read(&net_rwsem);
1906 mutex_lock(&act_id_mutex);
1907
1908 for_each_net(net) {
1909 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1910 act_id = id_ptr->id;
1911 tn = net_generic(net, act_id);
1912 if (!tn)
1913 continue;
1914 idrinfo = tn->idrinfo;
1915 if (!idrinfo)
1916 continue;
1917
1918 mutex_lock(&idrinfo->lock);
1919 idr = &idrinfo->action_idr;
1920 idr_for_each_entry_ul(idr, p, tmp, id) {
1921 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1922 continue;
1923 if (add) {
1924 tcf_action_offload_add_ex(p, NULL, cb,
1925 cb_priv);
1926 continue;
1927 }
1928
1929 /* cb unregister to update hw count */
1930 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1931 if (ret < 0)
1932 continue;
1933 if (tc_act_skip_sw(p->tcfa_flags) &&
1934 !tc_act_in_hw(p))
1935 tcf_reoffload_del_notify(net, p);
1936 }
1937 mutex_unlock(&idrinfo->lock);
1938 }
1939 }
1940 mutex_unlock(&act_id_mutex);
1941 up_read(&net_rwsem);
1942
1943 return 0;
1944}
1945
8d4390f5
PT		 1946static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n,
1947 struct tc_action *actions[],
1948 u32 portid, size_t attr_size,
1949 struct netlink_ext_ack *extack)
a56e1953 1950{
a56e1953
WC		 1951 struct sk_buff *skb;
1952
c73724bf 1953 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
a56e1953 1954 if (!skb)
8d4390f5 1955 return ERR_PTR(-ENOBUFS);
a56e1953
WC		 1956
1957 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
0349b877 1958 0, 2, extack) <= 0) {
84ae017a 1959 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
a56e1953 1960 kfree_skb(skb);
8d4390f5
PT		 1961 return ERR_PTR(-EINVAL);
1962 }
1963
1964 return skb;
1965}
1966
1967static int tcf_del_notify(struct net *net, struct nlmsghdr *n,
1968 struct tc_action *actions[], u32 portid,
1969 size_t attr_size, struct netlink_ext_ack *extack)
1970{
1971 struct sk_buff *skb;
1972 int ret;
1973
1974 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
1975 skb = NULL;
1976 } else {
1977 skb = tcf_del_notify_msg(net, n, actions, portid, attr_size,
1978 extack);
1979 if (IS_ERR(skb))
1980 return PTR_ERR(skb);
a56e1953
WC		 1981 }
1982
1983 /* now do the delete */
b144e7ec 1984 ret = tcf_action_delete(net, actions);
55334a5d 1985 if (ret < 0) {
84ae017a 1986 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
55334a5d
WC		 1987 kfree_skb(skb);
1988 return ret;
1989 }
a56e1953 1990
8d4390f5
PT		 1991 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
1992 n->nlmsg_flags & NLM_F_ECHO);
a56e1953
WC		 1993}
1994
1da177e4 1995static int
7316ae88 1996tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
84ae017a 1997 u32 portid, int event, struct netlink_ext_ack *extack)
1da177e4 1998{
cee63723 1999 int i, ret;
cc7ec456 2000 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
33be6271 2001 struct tc_action *act;
d04e6990 2002 size_t attr_size = 0;
edfaf94f 2003 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1da177e4 2004
8cb08174
JB		 2005 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
2006 extack);
cee63723
PM		 2007 if (ret < 0)
2008 return ret;
1da177e4 2009
cc7ec456 2010 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1af85155 2011 if (tb[1])
84ae017a 2012 return tca_action_flush(net, tb[1], n, portid, extack);
1af85155 2013
84ae017a 2014 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1af85155 2015 return -EINVAL;
1da177e4
LT		 2016 }
2017
7ba699c6 2018 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
84ae017a 2019 act = tcf_action_get_1(net, tb[i], n, portid, extack);
ab27cfb8
PM		 2020 if (IS_ERR(act)) {
2021 ret = PTR_ERR(act);
1da177e4 2022 goto err;
ab27cfb8 2023 }
4e76e75d 2024 attr_size += tcf_action_fill_size(act);
90b73b77 2025 actions[i - 1] = act;
1da177e4 2026 }
4e76e75d
RM		 2027
2028 attr_size = tcf_action_full_attrs_size(attr_size);
1da177e4
LT		 2029
2030 if (event == RTM_GETACTION)
90b73b77 2031 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1da177e4 2032 else { /* delete */
edfaf94f 2033 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
a56e1953 2034 if (ret)
1da177e4 2035 goto err;
edfaf94f 2036 return 0;
1da177e4
LT		 2037 }
2038err:
edfaf94f 2039 tcf_action_put_many(actions);
1da177e4
LT		 2040 return ret;
2041}
2042
8d4390f5
PT		 2043static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n,
2044 struct tc_action *actions[],
2045 u32 portid, size_t attr_size,
2046 struct netlink_ext_ack *extack)
1da177e4 2047{
1da177e4 2048 struct sk_buff *skb;
1da177e4 2049
c73724bf 2050 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL);
1da177e4 2051 if (!skb)
8d4390f5 2052 return ERR_PTR(-ENOBUFS);
1da177e4 2053
a56e1953 2054 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
0349b877 2055 RTM_NEWACTION, 0, 0, extack) <= 0) {
d143b9e3 2056 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
a56e1953 2057 kfree_skb(skb);
8d4390f5
PT		 2058 return ERR_PTR(-EINVAL);
2059 }
2060
2061 return skb;
2062}
2063
2064static int tcf_add_notify(struct net *net, struct nlmsghdr *n,
2065 struct tc_action *actions[], u32 portid,
2066 size_t attr_size, struct netlink_ext_ack *extack)
2067{
2068 struct sk_buff *skb;
2069
2070 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) {
2071 skb = NULL;
2072 } else {
2073 skb = tcf_add_notify_msg(net, n, actions, portid, attr_size,
2074 extack);
2075 if (IS_ERR(skb))
2076 return PTR_ERR(skb);
a56e1953 2077 }
10297b99 2078
8d4390f5
PT		 2079 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC,
2080 n->nlmsg_flags & NLM_F_ECHO);
1da177e4
LT		 2081}
2082
5a7a5555 2083static int tcf_action_add(struct net *net, struct nlattr *nla,
695176bf 2084 struct nlmsghdr *n, u32 portid, u32 flags,
aea0d727 2085 struct netlink_ext_ack *extack)
1da177e4 2086{
d04e6990 2087 size_t attr_size = 0;
a0e947c9 2088 int loop, ret;
90b73b77 2089 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
87c750e8 2090 int init_res[TCA_ACT_MAX_PRIO] = {};
1da177e4 2091
39f13ea2 2092 for (loop = 0; loop < 10; loop++) {
695176bf 2093 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
c86e0209 2094 &attr_size, flags, 0, extack);
39f13ea2
ED		 2095 if (ret != -EAGAIN)
2096 break;
2097 }
2098
90b73b77 2099 if (ret < 0)
f07fed82 2100 return ret;
a0e947c9 2101
90b73b77 2102 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
87c750e8 2103
a0e947c9
PT		 2104 /* only put bound actions */
2105 tca_put_bound_many(actions, init_res);
1da177e4 2106
cae422f3 2107 return ret;
1da177e4
LT		 2108}
2109
90825b23 2110static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
f460019b
VB		 2111 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2112 TCA_ACT_FLAG_TERSE_DUMP),
e62e484d 2113 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
90825b23
JHS		 2114};
2115
c21ef3e3
DA		 2116static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2117 struct netlink_ext_ack *extack)
1da177e4 2118{
3b1e0a65 2119 struct net *net = sock_net(skb->sk);
90825b23 2120 struct nlattr *tca[TCA_ROOT_MAX + 1];
8bf15395 2121 u32 portid = NETLINK_CB(skb).portid;
695176bf
CW		 2122 u32 flags = 0;
2123 int ret = 0;
1da177e4 2124
0b0f43fe
JHS		 2125 if ((n->nlmsg_type != RTM_GETACTION) &&
2126 !netlink_capable(skb, CAP_NET_ADMIN))
dfc47ef8
EB		 2127 return -EPERM;
2128
8cb08174
JB		 2129 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
2130 TCA_ROOT_MAX, NULL, extack);
7ba699c6
PM		 2131 if (ret < 0)
2132 return ret;
2133
2134 if (tca[TCA_ACT_TAB] == NULL) {
84ae017a 2135 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1da177e4
LT		 2136 return -EINVAL;
2137 }
2138
cc7ec456 2139 /* n->nlmsg_flags & NLM_F_CREATE */
1da177e4
LT		 2140 switch (n->nlmsg_type) {
2141 case RTM_NEWACTION:
2142 /* we are going to assume all other flags
25985edc 2143 * imply create only if it doesn't exist
1da177e4
LT		 2144 * Note that CREATE | EXCL implies that
2145 * but since we want avoid ambiguity (eg when flags
2146 * is zero) then just set this
2147 */
cc7ec456 2148 if (n->nlmsg_flags & NLM_F_REPLACE)
695176bf
CW		 2149 flags = TCA_ACT_FLAGS_REPLACE;
2150 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
aea0d727 2151 extack);
1da177e4
LT		 2152 break;
2153 case RTM_DELACTION:
7316ae88 2154 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
84ae017a 2155 portid, RTM_DELACTION, extack);
1da177e4
LT		 2156 break;
2157 case RTM_GETACTION:
7316ae88 2158 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
84ae017a 2159 portid, RTM_GETACTION, extack);
1da177e4
LT		 2160 break;
2161 default:
2162 BUG();
2163 }
2164
2165 return ret;
2166}
2167
90825b23 2168static struct nlattr *find_dump_kind(struct nlattr **nla)
1da177e4 2169{
cc7ec456 2170 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
7ba699c6 2171 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
7ba699c6 2172 struct nlattr *kind;
1da177e4 2173
7ba699c6 2174 tb1 = nla[TCA_ACT_TAB];
1da177e4
LT		 2175 if (tb1 == NULL)
2176 return NULL;
2177
8cb08174 2178 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1da177e4 2179 return NULL;
1da177e4 2180
6d834e04
PM		 2181 if (tb[1] == NULL)
2182 return NULL;
199ce850 2183 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
1da177e4 2184 return NULL;
7ba699c6 2185 kind = tb2[TCA_ACT_KIND];
1da177e4 2186
26dab893 2187 return kind;
1da177e4
LT		 2188}
2189
5a7a5555 2190static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1da177e4 2191{
ddf97ccd 2192 struct net *net = sock_net(skb->sk);
1da177e4 2193 struct nlmsghdr *nlh;
27a884dc 2194 unsigned char *b = skb_tail_pointer(skb);
4b3550ef 2195 struct nlattr *nest;
1da177e4 2196 struct tc_action_ops *a_o;
1da177e4 2197 int ret = 0;
8b00a53c 2198 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
90825b23
JHS		 2199 struct nlattr *tb[TCA_ROOT_MAX + 1];
2200 struct nlattr *count_attr = NULL;
e62e484d 2201 unsigned long jiffy_since = 0;
90825b23
JHS		 2202 struct nlattr *kind = NULL;
2203 struct nla_bitfield32 bf;
e62e484d 2204 u32 msecs_since = 0;
90825b23
JHS		 2205 u32 act_count = 0;
2206
8cb08174
JB		 2207 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2208 TCA_ROOT_MAX, tcaa_policy, cb->extack);
90825b23
JHS		 2209 if (ret < 0)
2210 return ret;
1da177e4 2211
90825b23 2212 kind = find_dump_kind(tb);
1da177e4 2213 if (kind == NULL) {
6ff9c364 2214 pr_info("tc_dump_action: action bad kind\n");
1da177e4
LT		 2215 return 0;
2216 }
2217
26dab893 2218 a_o = tc_lookup_action(kind);
cc7ec456 2219 if (a_o == NULL)
1da177e4 2220 return 0;
1da177e4 2221
90825b23
JHS		 2222 cb->args[2] = 0;
2223 if (tb[TCA_ROOT_FLAGS]) {
2224 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2225 cb->args[2] = bf.value;
2226 }
2227
e62e484d
JHS		 2228 if (tb[TCA_ROOT_TIME_DELTA]) {
2229 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2230 }
2231
15e47304 2232 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
8b00a53c
DM		 2233 cb->nlh->nlmsg_type, sizeof(*t), 0);
2234 if (!nlh)
2235 goto out_module_put;
90825b23 2236
e62e484d
JHS		 2237 if (msecs_since)
2238 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2239
8b00a53c 2240 t = nlmsg_data(nlh);
1da177e4 2241 t->tca_family = AF_UNSPEC;
9ef1d4c7
PM		 2242 t->tca__pad1 = 0;
2243 t->tca__pad2 = 0;
e62e484d 2244 cb->args[3] = jiffy_since;
90825b23
JHS		 2245 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2246 if (!count_attr)
2247 goto out_module_put;
1da177e4 2248
ae0be8de 2249 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
4b3550ef 2250 if (nest == NULL)
8b00a53c 2251 goto out_module_put;
1da177e4 2252
fae52d93 2253 ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL);
1da177e4 2254 if (ret < 0)
8b00a53c 2255 goto out_module_put;
1da177e4
LT		 2256
2257 if (ret > 0) {
4b3550ef 2258 nla_nest_end(skb, nest);
1da177e4 2259 ret = skb->len;
90825b23
JHS		 2260 act_count = cb->args[1];
2261 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2262 cb->args[1] = 0;
1da177e4 2263 } else
ebecaa66 2264 nlmsg_trim(skb, b);
1da177e4 2265
27a884dc 2266 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
15e47304 2267 if (NETLINK_CB(cb->skb).portid && ret)
1da177e4
LT		 2268 nlh->nlmsg_flags |= NLM_F_MULTI;
2269 module_put(a_o->owner);
2270 return skb->len;
2271
8b00a53c 2272out_module_put:
1da177e4 2273 module_put(a_o->owner);
dc5fc579 2274 nlmsg_trim(skb, b);
1da177e4
LT		 2275 return skb->len;
2276}
2277
cc72bb03
KI		 2278static const struct rtnl_msg_handler tc_action_rtnl_msg_handlers[] __initconst = {
2279 {.msgtype = RTM_NEWACTION, .doit = tc_ctl_action},
2280 {.msgtype = RTM_DELACTION, .doit = tc_ctl_action},
2281 {.msgtype = RTM_GETACTION, .doit = tc_ctl_action,
2282 .dumpit = tc_dump_action},
2283};
2284
1da177e4
LT		 2285static int __init tc_action_init(void)
2286{
cc72bb03 2287 rtnl_register_many(tc_action_rtnl_msg_handlers);
1da177e4
LT		 2288 return 0;
2289}
2290
2291subsys_initcall(tc_action_init);
Linux 6.x block layer and io_uring tree(s)