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Linux 5.7.7
[linux/fpc-iii.git] / net / sched / act_api.c
blobdf456090915769c6e782aaf5b03c75632f383550
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/sched/act_api.c Packet action API.
4 *
5 * Author: Jamal Hadi Salim
6 */
7
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/string.h>
11 #include <linux/errno.h>
12 #include <linux/slab.h>
13 #include <linux/skbuff.h>
14 #include <linux/init.h>
15 #include <linux/kmod.h>
16 #include <linux/err.h>
17 #include <linux/module.h>
18 #include <net/net_namespace.h>
19 #include <net/sock.h>
20 #include <net/sch_generic.h>
21 #include <net/pkt_cls.h>
22 #include <net/act_api.h>
23 #include <net/netlink.h>
24
25 static void tcf_action_goto_chain_exec(const struct tc_action *a,
26 struct tcf_result *res)
27 {
28 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
29
30 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
31 }
32
33 static void tcf_free_cookie_rcu(struct rcu_head *p)
34 {
35 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
36
37 kfree(cookie->data);
38 kfree(cookie);
39 }
40
41 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
42 struct tc_cookie *new_cookie)
43 {
44 struct tc_cookie *old;
45
46 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
47 if (old)
48 call_rcu(&old->rcu, tcf_free_cookie_rcu);
49 }
50
51 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
52 struct tcf_chain **newchain,
53 struct netlink_ext_ack *extack)
54 {
55 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
56 u32 chain_index;
57
58 if (!opcode)
59 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
60 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
61 ret = 0;
62 if (ret) {
63 NL_SET_ERR_MSG(extack, "invalid control action");
64 goto end;
65 }
66
67 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
68 chain_index = action & TC_ACT_EXT_VAL_MASK;
69 if (!tp || !newchain) {
70 ret = -EINVAL;
71 NL_SET_ERR_MSG(extack,
72 "can't goto NULL proto/chain");
73 goto end;
74 }
75 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
76 if (!*newchain) {
77 ret = -ENOMEM;
78 NL_SET_ERR_MSG(extack,
79 "can't allocate goto_chain");
80 }
81 }
82 end:
83 return ret;
84 }
85 EXPORT_SYMBOL(tcf_action_check_ctrlact);
86
87 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
88 struct tcf_chain *goto_chain)
89 {
90 a->tcfa_action = action;
91 goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
92 return goto_chain;
93 }
94 EXPORT_SYMBOL(tcf_action_set_ctrlact);
95
96 /* XXX: For standalone actions, we don't need a RCU grace period either, because
97 * actions are always connected to filters and filters are already destroyed in
98 * RCU callbacks, so after a RCU grace period actions are already disconnected
99 * from filters. Readers later can not find us.
100 */
101 static void free_tcf(struct tc_action *p)
102 {
103 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
104
105 free_percpu(p->cpu_bstats);
106 free_percpu(p->cpu_bstats_hw);
107 free_percpu(p->cpu_qstats);
108
109 tcf_set_action_cookie(&p->act_cookie, NULL);
110 if (chain)
111 tcf_chain_put_by_act(chain);
112
113 kfree(p);
114 }
115
116 static void tcf_action_cleanup(struct tc_action *p)
117 {
118 if (p->ops->cleanup)
119 p->ops->cleanup(p);
120
121 gen_kill_estimator(&p->tcfa_rate_est);
122 free_tcf(p);
123 }
124
125 static int __tcf_action_put(struct tc_action *p, bool bind)
126 {
127 struct tcf_idrinfo *idrinfo = p->idrinfo;
128
129 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
130 if (bind)
131 atomic_dec(&p->tcfa_bindcnt);
132 idr_remove(&idrinfo->action_idr, p->tcfa_index);
133 mutex_unlock(&idrinfo->lock);
134
135 tcf_action_cleanup(p);
136 return 1;
137 }
138
139 if (bind)
140 atomic_dec(&p->tcfa_bindcnt);
141
142 return 0;
143 }
144
145 int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
146 {
147 int ret = 0;
148
149 /* Release with strict==1 and bind==0 is only called through act API
150 * interface (classifiers always bind). Only case when action with
151 * positive reference count and zero bind count can exist is when it was
152 * also created with act API (unbinding last classifier will destroy the
153 * action if it was created by classifier). So only case when bind count
154 * can be changed after initial check is when unbound action is
155 * destroyed by act API while classifier binds to action with same id
156 * concurrently. This result either creation of new action(same behavior
157 * as before), or reusing existing action if concurrent process
158 * increments reference count before action is deleted. Both scenarios
159 * are acceptable.
160 */
161 if (p) {
162 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
163 return -EPERM;
164
165 if (__tcf_action_put(p, bind))
166 ret = ACT_P_DELETED;
167 }
168
169 return ret;
170 }
171 EXPORT_SYMBOL(__tcf_idr_release);
172
173 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
174 {
175 struct tc_cookie *act_cookie;
176 u32 cookie_len = 0;
177
178 rcu_read_lock();
179 act_cookie = rcu_dereference(act->act_cookie);
180
181 if (act_cookie)
182 cookie_len = nla_total_size(act_cookie->len);
183 rcu_read_unlock();
184
185 return nla_total_size(0) /* action number nested */
186 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
187 + cookie_len /* TCA_ACT_COOKIE */
188 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
189 + nla_total_size(0) /* TCA_ACT_STATS nested */
190 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
191 /* TCA_STATS_BASIC */
192 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
193 /* TCA_STATS_PKT64 */
194 + nla_total_size_64bit(sizeof(u64))
195 /* TCA_STATS_QUEUE */
196 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
197 + nla_total_size(0) /* TCA_OPTIONS nested */
198 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
199 }
200
201 static size_t tcf_action_full_attrs_size(size_t sz)
202 {
203 return NLMSG_HDRLEN /* struct nlmsghdr */
204 + sizeof(struct tcamsg)
205 + nla_total_size(0) /* TCA_ACT_TAB nested */
206 + sz;
207 }
208
209 static size_t tcf_action_fill_size(const struct tc_action *act)
210 {
211 size_t sz = tcf_action_shared_attrs_size(act);
212
213 if (act->ops->get_fill_size)
214 return act->ops->get_fill_size(act) + sz;
215 return sz;
216 }
217
218 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
219 struct netlink_callback *cb)
220 {
221 int err = 0, index = -1, s_i = 0, n_i = 0;
222 u32 act_flags = cb->args[2];
223 unsigned long jiffy_since = cb->args[3];
224 struct nlattr *nest;
225 struct idr *idr = &idrinfo->action_idr;
226 struct tc_action *p;
227 unsigned long id = 1;
228 unsigned long tmp;
229
230 mutex_lock(&idrinfo->lock);
231
232 s_i = cb->args[0];
233
234 idr_for_each_entry_ul(idr, p, tmp, id) {
235 index++;
236 if (index < s_i)
237 continue;
238
239 if (jiffy_since &&
240 time_after(jiffy_since,
241 (unsigned long)p->tcfa_tm.lastuse))
242 continue;
243
244 nest = nla_nest_start_noflag(skb, n_i);
245 if (!nest) {
246 index--;
247 goto nla_put_failure;
248 }
249 err = tcf_action_dump_1(skb, p, 0, 0);
250 if (err < 0) {
251 index--;
252 nlmsg_trim(skb, nest);
253 goto done;
254 }
255 nla_nest_end(skb, nest);
256 n_i++;
257 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
258 n_i >= TCA_ACT_MAX_PRIO)
259 goto done;
260 }
261 done:
262 if (index >= 0)
263 cb->args[0] = index + 1;
264
265 mutex_unlock(&idrinfo->lock);
266 if (n_i) {
267 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
268 cb->args[1] = n_i;
269 }
270 return n_i;
271
272 nla_put_failure:
273 nla_nest_cancel(skb, nest);
274 goto done;
275 }
276
277 static int tcf_idr_release_unsafe(struct tc_action *p)
278 {
279 if (atomic_read(&p->tcfa_bindcnt) > 0)
280 return -EPERM;
281
282 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
283 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
284 tcf_action_cleanup(p);
285 return ACT_P_DELETED;
286 }
287
288 return 0;
289 }
290
291 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
292 const struct tc_action_ops *ops)
293 {
294 struct nlattr *nest;
295 int n_i = 0;
296 int ret = -EINVAL;
297 struct idr *idr = &idrinfo->action_idr;
298 struct tc_action *p;
299 unsigned long id = 1;
300 unsigned long tmp;
301
302 nest = nla_nest_start_noflag(skb, 0);
303 if (nest == NULL)
304 goto nla_put_failure;
305 if (nla_put_string(skb, TCA_KIND, ops->kind))
306 goto nla_put_failure;
307
308 mutex_lock(&idrinfo->lock);
309 idr_for_each_entry_ul(idr, p, tmp, id) {
310 ret = tcf_idr_release_unsafe(p);
311 if (ret == ACT_P_DELETED) {
312 module_put(ops->owner);
313 n_i++;
314 } else if (ret < 0) {
315 mutex_unlock(&idrinfo->lock);
316 goto nla_put_failure;
317 }
318 }
319 mutex_unlock(&idrinfo->lock);
320
321 if (nla_put_u32(skb, TCA_FCNT, n_i))
322 goto nla_put_failure;
323 nla_nest_end(skb, nest);
324
325 return n_i;
326 nla_put_failure:
327 nla_nest_cancel(skb, nest);
328 return ret;
329 }
330
331 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
332 struct netlink_callback *cb, int type,
333 const struct tc_action_ops *ops,
334 struct netlink_ext_ack *extack)
335 {
336 struct tcf_idrinfo *idrinfo = tn->idrinfo;
337
338 if (type == RTM_DELACTION) {
339 return tcf_del_walker(idrinfo, skb, ops);
340 } else if (type == RTM_GETACTION) {
341 return tcf_dump_walker(idrinfo, skb, cb);
342 } else {
343 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
344 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
345 return -EINVAL;
346 }
347 }
348 EXPORT_SYMBOL(tcf_generic_walker);
349
350 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
351 {
352 struct tcf_idrinfo *idrinfo = tn->idrinfo;
353 struct tc_action *p;
354
355 mutex_lock(&idrinfo->lock);
356 p = idr_find(&idrinfo->action_idr, index);
357 if (IS_ERR(p))
358 p = NULL;
359 else if (p)
360 refcount_inc(&p->tcfa_refcnt);
361 mutex_unlock(&idrinfo->lock);
362
363 if (p) {
364 *a = p;
365 return true;
366 }
367 return false;
368 }
369 EXPORT_SYMBOL(tcf_idr_search);
370
371 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
372 {
373 struct tc_action *p;
374 int ret = 0;
375
376 mutex_lock(&idrinfo->lock);
377 p = idr_find(&idrinfo->action_idr, index);
378 if (!p) {
379 mutex_unlock(&idrinfo->lock);
380 return -ENOENT;
381 }
382
383 if (!atomic_read(&p->tcfa_bindcnt)) {
384 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
385 struct module *owner = p->ops->owner;
386
387 WARN_ON(p != idr_remove(&idrinfo->action_idr,
388 p->tcfa_index));
389 mutex_unlock(&idrinfo->lock);
390
391 tcf_action_cleanup(p);
392 module_put(owner);
393 return 0;
394 }
395 ret = 0;
396 } else {
397 ret = -EPERM;
398 }
399
400 mutex_unlock(&idrinfo->lock);
401 return ret;
402 }
403
404 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
405 struct tc_action **a, const struct tc_action_ops *ops,
406 int bind, bool cpustats, u32 flags)
407 {
408 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
409 struct tcf_idrinfo *idrinfo = tn->idrinfo;
410 int err = -ENOMEM;
411
412 if (unlikely(!p))
413 return -ENOMEM;
414 refcount_set(&p->tcfa_refcnt, 1);
415 if (bind)
416 atomic_set(&p->tcfa_bindcnt, 1);
417
418 if (cpustats) {
419 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
420 if (!p->cpu_bstats)
421 goto err1;
422 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
423 if (!p->cpu_bstats_hw)
424 goto err2;
425 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
426 if (!p->cpu_qstats)
427 goto err3;
428 }
429 spin_lock_init(&p->tcfa_lock);
430 p->tcfa_index = index;
431 p->tcfa_tm.install = jiffies;
432 p->tcfa_tm.lastuse = jiffies;
433 p->tcfa_tm.firstuse = 0;
434 p->tcfa_flags = flags;
435 if (est) {
436 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
437 &p->tcfa_rate_est,
438 &p->tcfa_lock, NULL, est);
439 if (err)
440 goto err4;
441 }
442
443 p->idrinfo = idrinfo;
444 p->ops = ops;
445 *a = p;
446 return 0;
447 err4:
448 free_percpu(p->cpu_qstats);
449 err3:
450 free_percpu(p->cpu_bstats_hw);
451 err2:
452 free_percpu(p->cpu_bstats);
453 err1:
454 kfree(p);
455 return err;
456 }
457 EXPORT_SYMBOL(tcf_idr_create);
458
459 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
460 struct nlattr *est, struct tc_action **a,
461 const struct tc_action_ops *ops, int bind,
462 u32 flags)
463 {
464 /* Set cpustats according to actions flags. */
465 return tcf_idr_create(tn, index, est, a, ops, bind,
466 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
467 }
468 EXPORT_SYMBOL(tcf_idr_create_from_flags);
469
470 void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
471 {
472 struct tcf_idrinfo *idrinfo = tn->idrinfo;
473
474 mutex_lock(&idrinfo->lock);
475 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
476 WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index)));
477 mutex_unlock(&idrinfo->lock);
478 }
479 EXPORT_SYMBOL(tcf_idr_insert);
480
481 /* Cleanup idr index that was allocated but not initialized. */
482
483 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
484 {
485 struct tcf_idrinfo *idrinfo = tn->idrinfo;
486
487 mutex_lock(&idrinfo->lock);
488 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
489 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
490 mutex_unlock(&idrinfo->lock);
491 }
492 EXPORT_SYMBOL(tcf_idr_cleanup);
493
494 /* Check if action with specified index exists. If actions is found, increments
495 * its reference and bind counters, and return 1. Otherwise insert temporary
496 * error pointer (to prevent concurrent users from inserting actions with same
497 * index) and return 0.
498 */
499
500 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
501 struct tc_action **a, int bind)
502 {
503 struct tcf_idrinfo *idrinfo = tn->idrinfo;
504 struct tc_action *p;
505 int ret;
506
507 again:
508 mutex_lock(&idrinfo->lock);
509 if (*index) {
510 p = idr_find(&idrinfo->action_idr, *index);
511 if (IS_ERR(p)) {
512 /* This means that another process allocated
513 * index but did not assign the pointer yet.
514 */
515 mutex_unlock(&idrinfo->lock);
516 goto again;
517 }
518
519 if (p) {
520 refcount_inc(&p->tcfa_refcnt);
521 if (bind)
522 atomic_inc(&p->tcfa_bindcnt);
523 *a = p;
524 ret = 1;
525 } else {
526 *a = NULL;
527 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
528 *index, GFP_KERNEL);
529 if (!ret)
530 idr_replace(&idrinfo->action_idr,
531 ERR_PTR(-EBUSY), *index);
532 }
533 } else {
534 *index = 1;
535 *a = NULL;
536 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
537 UINT_MAX, GFP_KERNEL);
538 if (!ret)
539 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
540 *index);
541 }
542 mutex_unlock(&idrinfo->lock);
543 return ret;
544 }
545 EXPORT_SYMBOL(tcf_idr_check_alloc);
546
547 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
548 struct tcf_idrinfo *idrinfo)
549 {
550 struct idr *idr = &idrinfo->action_idr;
551 struct tc_action *p;
552 int ret;
553 unsigned long id = 1;
554 unsigned long tmp;
555
556 idr_for_each_entry_ul(idr, p, tmp, id) {
557 ret = __tcf_idr_release(p, false, true);
558 if (ret == ACT_P_DELETED)
559 module_put(ops->owner);
560 else if (ret < 0)
561 return;
562 }
563 idr_destroy(&idrinfo->action_idr);
564 }
565 EXPORT_SYMBOL(tcf_idrinfo_destroy);
566
567 static LIST_HEAD(act_base);
568 static DEFINE_RWLOCK(act_mod_lock);
569
570 int tcf_register_action(struct tc_action_ops *act,
571 struct pernet_operations *ops)
572 {
573 struct tc_action_ops *a;
574 int ret;
575
576 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
577 return -EINVAL;
578
579 /* We have to register pernet ops before making the action ops visible,
580 * otherwise tcf_action_init_1() could get a partially initialized
581 * netns.
582 */
583 ret = register_pernet_subsys(ops);
584 if (ret)
585 return ret;
586
587 write_lock(&act_mod_lock);
588 list_for_each_entry(a, &act_base, head) {
589 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
590 write_unlock(&act_mod_lock);
591 unregister_pernet_subsys(ops);
592 return -EEXIST;
593 }
594 }
595 list_add_tail(&act->head, &act_base);
596 write_unlock(&act_mod_lock);
597
598 return 0;
599 }
600 EXPORT_SYMBOL(tcf_register_action);
601
602 int tcf_unregister_action(struct tc_action_ops *act,
603 struct pernet_operations *ops)
604 {
605 struct tc_action_ops *a;
606 int err = -ENOENT;
607
608 write_lock(&act_mod_lock);
609 list_for_each_entry(a, &act_base, head) {
610 if (a == act) {
611 list_del(&act->head);
612 err = 0;
613 break;
614 }
615 }
616 write_unlock(&act_mod_lock);
617 if (!err)
618 unregister_pernet_subsys(ops);
619 return err;
620 }
621 EXPORT_SYMBOL(tcf_unregister_action);
622
623 /* lookup by name */
624 static struct tc_action_ops *tc_lookup_action_n(char *kind)
625 {
626 struct tc_action_ops *a, *res = NULL;
627
628 if (kind) {
629 read_lock(&act_mod_lock);
630 list_for_each_entry(a, &act_base, head) {
631 if (strcmp(kind, a->kind) == 0) {
632 if (try_module_get(a->owner))
633 res = a;
634 break;
635 }
636 }
637 read_unlock(&act_mod_lock);
638 }
639 return res;
640 }
641
642 /* lookup by nlattr */
643 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
644 {
645 struct tc_action_ops *a, *res = NULL;
646
647 if (kind) {
648 read_lock(&act_mod_lock);
649 list_for_each_entry(a, &act_base, head) {
650 if (nla_strcmp(kind, a->kind) == 0) {
651 if (try_module_get(a->owner))
652 res = a;
653 break;
654 }
655 }
656 read_unlock(&act_mod_lock);
657 }
658 return res;
659 }
660
661 /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
662 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
663 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
664 int nr_actions, struct tcf_result *res)
665 {
666 u32 jmp_prgcnt = 0;
667 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
668 int i;
669 int ret = TC_ACT_OK;
670
671 if (skb_skip_tc_classify(skb))
672 return TC_ACT_OK;
673
674 restart_act_graph:
675 for (i = 0; i < nr_actions; i++) {
676 const struct tc_action *a = actions[i];
677
678 if (jmp_prgcnt > 0) {
679 jmp_prgcnt -= 1;
680 continue;
681 }
682 repeat:
683 ret = a->ops->act(skb, a, res);
684 if (ret == TC_ACT_REPEAT)
685 goto repeat; /* we need a ttl - JHS */
686
687 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
688 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
689 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
690 /* faulty opcode, stop pipeline */
691 return TC_ACT_OK;
692 } else {
693 jmp_ttl -= 1;
694 if (jmp_ttl > 0)
695 goto restart_act_graph;
696 else /* faulty graph, stop pipeline */
697 return TC_ACT_OK;
698 }
699 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
700 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
701 net_warn_ratelimited("can't go to NULL chain!\n");
702 return TC_ACT_SHOT;
703 }
704 tcf_action_goto_chain_exec(a, res);
705 }
706
707 if (ret != TC_ACT_PIPE)
708 break;
709 }
710
711 return ret;
712 }
713 EXPORT_SYMBOL(tcf_action_exec);
714
715 int tcf_action_destroy(struct tc_action *actions[], int bind)
716 {
717 const struct tc_action_ops *ops;
718 struct tc_action *a;
719 int ret = 0, i;
720
721 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
722 a = actions[i];
723 actions[i] = NULL;
724 ops = a->ops;
725 ret = __tcf_idr_release(a, bind, true);
726 if (ret == ACT_P_DELETED)
727 module_put(ops->owner);
728 else if (ret < 0)
729 return ret;
730 }
731 return ret;
732 }
733
734 static int tcf_action_destroy_1(struct tc_action *a, int bind)
735 {
736 struct tc_action *actions[] = { a, NULL };
737
738 return tcf_action_destroy(actions, bind);
739 }
740
741 static int tcf_action_put(struct tc_action *p)
742 {
743 return __tcf_action_put(p, false);
744 }
745
746 /* Put all actions in this array, skip those NULL's. */
747 static void tcf_action_put_many(struct tc_action *actions[])
748 {
749 int i;
750
751 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
752 struct tc_action *a = actions[i];
753 const struct tc_action_ops *ops;
754
755 if (!a)
756 continue;
757 ops = a->ops;
758 if (tcf_action_put(a))
759 module_put(ops->owner);
760 }
761 }
762
763 int
764 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
765 {
766 return a->ops->dump(skb, a, bind, ref);
767 }
768
769 int
770 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
771 {
772 int err = -EINVAL;
773 unsigned char *b = skb_tail_pointer(skb);
774 struct nlattr *nest;
775 struct tc_cookie *cookie;
776
777 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
778 goto nla_put_failure;
779 if (tcf_action_copy_stats(skb, a, 0))
780 goto nla_put_failure;
781
782 rcu_read_lock();
783 cookie = rcu_dereference(a->act_cookie);
784 if (cookie) {
785 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
786 rcu_read_unlock();
787 goto nla_put_failure;
788 }
789 }
790 rcu_read_unlock();
791
792 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
793 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
794 a->hw_stats, TCA_ACT_HW_STATS_ANY))
795 goto nla_put_failure;
796
797 if (a->used_hw_stats_valid &&
798 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
799 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
800 goto nla_put_failure;
801
802 if (a->tcfa_flags &&
803 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
804 a->tcfa_flags, a->tcfa_flags))
805 goto nla_put_failure;
806
807 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
808 if (nest == NULL)
809 goto nla_put_failure;
810 err = tcf_action_dump_old(skb, a, bind, ref);
811 if (err > 0) {
812 nla_nest_end(skb, nest);
813 return err;
814 }
815
816 nla_put_failure:
817 nlmsg_trim(skb, b);
818 return -1;
819 }
820 EXPORT_SYMBOL(tcf_action_dump_1);
821
822 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
823 int bind, int ref)
824 {
825 struct tc_action *a;
826 int err = -EINVAL, i;
827 struct nlattr *nest;
828
829 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
830 a = actions[i];
831 nest = nla_nest_start_noflag(skb, i + 1);
832 if (nest == NULL)
833 goto nla_put_failure;
834 err = tcf_action_dump_1(skb, a, bind, ref);
835 if (err < 0)
836 goto errout;
837 nla_nest_end(skb, nest);
838 }
839
840 return 0;
841
842 nla_put_failure:
843 err = -EINVAL;
844 errout:
845 nla_nest_cancel(skb, nest);
846 return err;
847 }
848
849 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
850 {
851 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
852 if (!c)
853 return NULL;
854
855 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
856 if (!c->data) {
857 kfree(c);
858 return NULL;
859 }
860 c->len = nla_len(tb[TCA_ACT_COOKIE]);
861
862 return c;
863 }
864
865 static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
866 {
867 struct nla_bitfield32 hw_stats_bf;
868
869 /* If the user did not pass the attr, that means he does
870 * not care about the type. Return "any" in that case
871 * which is setting on all supported types.
872 */
873 if (!hw_stats_attr)
874 return TCA_ACT_HW_STATS_ANY;
875 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
876 return hw_stats_bf.value;
877 }
878
879 static const u32 tca_act_flags_allowed = TCA_ACT_FLAGS_NO_PERCPU_STATS;
880 static const u32 tca_act_hw_stats_allowed = TCA_ACT_HW_STATS_ANY;
881
882 static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
883 [TCA_ACT_KIND] = { .type = NLA_STRING },
884 [TCA_ACT_INDEX] = { .type = NLA_U32 },
885 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
886 .len = TC_COOKIE_MAX_SIZE },
887 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
888 [TCA_ACT_FLAGS] = { .type = NLA_BITFIELD32,
889 .validation_data = &tca_act_flags_allowed },
890 [TCA_ACT_HW_STATS] = { .type = NLA_BITFIELD32,
891 .validation_data = &tca_act_hw_stats_allowed },
892 };
893
894 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
895 struct nlattr *nla, struct nlattr *est,
896 char *name, int ovr, int bind,
897 bool rtnl_held,
898 struct netlink_ext_ack *extack)
899 {
900 struct nla_bitfield32 flags = { 0, 0 };
901 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
902 struct tc_action *a;
903 struct tc_action_ops *a_o;
904 struct tc_cookie *cookie = NULL;
905 char act_name[IFNAMSIZ];
906 struct nlattr *tb[TCA_ACT_MAX + 1];
907 struct nlattr *kind;
908 int err;
909
910 if (name == NULL) {
911 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
912 tcf_action_policy, extack);
913 if (err < 0)
914 goto err_out;
915 err = -EINVAL;
916 kind = tb[TCA_ACT_KIND];
917 if (!kind) {
918 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
919 goto err_out;
920 }
921 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
922 NL_SET_ERR_MSG(extack, "TC action name too long");
923 goto err_out;
924 }
925 if (tb[TCA_ACT_COOKIE]) {
926 cookie = nla_memdup_cookie(tb);
927 if (!cookie) {
928 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
929 err = -ENOMEM;
930 goto err_out;
931 }
932 }
933 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
934 if (tb[TCA_ACT_FLAGS])
935 flags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
936 } else {
937 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
938 NL_SET_ERR_MSG(extack, "TC action name too long");
939 err = -EINVAL;
940 goto err_out;
941 }
942 }
943
944 a_o = tc_lookup_action_n(act_name);
945 if (a_o == NULL) {
946 #ifdef CONFIG_MODULES
947 if (rtnl_held)
948 rtnl_unlock();
949 request_module("act_%s", act_name);
950 if (rtnl_held)
951 rtnl_lock();
952
953 a_o = tc_lookup_action_n(act_name);
954
955 /* We dropped the RTNL semaphore in order to
956 * perform the module load. So, even if we
957 * succeeded in loading the module we have to
958 * tell the caller to replay the request. We
959 * indicate this using -EAGAIN.
960 */
961 if (a_o != NULL) {
962 err = -EAGAIN;
963 goto err_mod;
964 }
965 #endif
966 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
967 err = -ENOENT;
968 goto err_out;
969 }
970
971 /* backward compatibility for policer */
972 if (name == NULL)
973 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
974 rtnl_held, tp, flags.value, extack);
975 else
976 err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
977 tp, flags.value, extack);
978 if (err < 0)
979 goto err_mod;
980
981 if (!name && tb[TCA_ACT_COOKIE])
982 tcf_set_action_cookie(&a->act_cookie, cookie);
983
984 if (!name)
985 a->hw_stats = hw_stats;
986
987 /* module count goes up only when brand new policy is created
988 * if it exists and is only bound to in a_o->init() then
989 * ACT_P_CREATED is not returned (a zero is).
990 */
991 if (err != ACT_P_CREATED)
992 module_put(a_o->owner);
993
994 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN) &&
995 !rcu_access_pointer(a->goto_chain)) {
996 tcf_action_destroy_1(a, bind);
997 NL_SET_ERR_MSG(extack, "can't use goto chain with NULL chain");
998 return ERR_PTR(-EINVAL);
999 }
1000
1001 return a;
1002
1003 err_mod:
1004 module_put(a_o->owner);
1005 err_out:
1006 if (cookie) {
1007 kfree(cookie->data);
1008 kfree(cookie);
1009 }
1010 return ERR_PTR(err);
1011 }
1012
1013 /* Returns numbers of initialized actions or negative error. */
1014
1015 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1016 struct nlattr *est, char *name, int ovr, int bind,
1017 struct tc_action *actions[], size_t *attr_size,
1018 bool rtnl_held, struct netlink_ext_ack *extack)
1019 {
1020 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1021 struct tc_action *act;
1022 size_t sz = 0;
1023 int err;
1024 int i;
1025
1026 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1027 extack);
1028 if (err < 0)
1029 return err;
1030
1031 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1032 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
1033 rtnl_held, extack);
1034 if (IS_ERR(act)) {
1035 err = PTR_ERR(act);
1036 goto err;
1037 }
1038 sz += tcf_action_fill_size(act);
1039 /* Start from index 0 */
1040 actions[i - 1] = act;
1041 }
1042
1043 *attr_size = tcf_action_full_attrs_size(sz);
1044 return i - 1;
1045
1046 err:
1047 tcf_action_destroy(actions, bind);
1048 return err;
1049 }
1050
1051 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u32 packets,
1052 bool drop, bool hw)
1053 {
1054 if (a->cpu_bstats) {
1055 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1056
1057 if (drop)
1058 this_cpu_ptr(a->cpu_qstats)->drops += packets;
1059
1060 if (hw)
1061 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
1062 bytes, packets);
1063 return;
1064 }
1065
1066 _bstats_update(&a->tcfa_bstats, bytes, packets);
1067 if (drop)
1068 a->tcfa_qstats.drops += packets;
1069 if (hw)
1070 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1071 }
1072 EXPORT_SYMBOL(tcf_action_update_stats);
1073
1074 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1075 int compat_mode)
1076 {
1077 int err = 0;
1078 struct gnet_dump d;
1079
1080 if (p == NULL)
1081 goto errout;
1082
1083 /* compat_mode being true specifies a call that is supposed
1084 * to add additional backward compatibility statistic TLVs.
1085 */
1086 if (compat_mode) {
1087 if (p->type == TCA_OLD_COMPAT)
1088 err = gnet_stats_start_copy_compat(skb, 0,
1089 TCA_STATS,
1090 TCA_XSTATS,
1091 &p->tcfa_lock, &d,
1092 TCA_PAD);
1093 else
1094 return 0;
1095 } else
1096 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1097 &p->tcfa_lock, &d, TCA_ACT_PAD);
1098
1099 if (err < 0)
1100 goto errout;
1101
1102 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
1103 gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
1104 &p->tcfa_bstats_hw) < 0 ||
1105 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1106 gnet_stats_copy_queue(&d, p->cpu_qstats,
1107 &p->tcfa_qstats,
1108 p->tcfa_qstats.qlen) < 0)
1109 goto errout;
1110
1111 if (gnet_stats_finish_copy(&d) < 0)
1112 goto errout;
1113
1114 return 0;
1115
1116 errout:
1117 return -1;
1118 }
1119
1120 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1121 u32 portid, u32 seq, u16 flags, int event, int bind,
1122 int ref)
1123 {
1124 struct tcamsg *t;
1125 struct nlmsghdr *nlh;
1126 unsigned char *b = skb_tail_pointer(skb);
1127 struct nlattr *nest;
1128
1129 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1130 if (!nlh)
1131 goto out_nlmsg_trim;
1132 t = nlmsg_data(nlh);
1133 t->tca_family = AF_UNSPEC;
1134 t->tca__pad1 = 0;
1135 t->tca__pad2 = 0;
1136
1137 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1138 if (!nest)
1139 goto out_nlmsg_trim;
1140
1141 if (tcf_action_dump(skb, actions, bind, ref) < 0)
1142 goto out_nlmsg_trim;
1143
1144 nla_nest_end(skb, nest);
1145
1146 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1147 return skb->len;
1148
1149 out_nlmsg_trim:
1150 nlmsg_trim(skb, b);
1151 return -1;
1152 }
1153
1154 static int
1155 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1156 struct tc_action *actions[], int event,
1157 struct netlink_ext_ack *extack)
1158 {
1159 struct sk_buff *skb;
1160
1161 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1162 if (!skb)
1163 return -ENOBUFS;
1164 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1165 0, 1) <= 0) {
1166 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1167 kfree_skb(skb);
1168 return -EINVAL;
1169 }
1170
1171 return rtnl_unicast(skb, net, portid);
1172 }
1173
1174 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1175 struct nlmsghdr *n, u32 portid,
1176 struct netlink_ext_ack *extack)
1177 {
1178 struct nlattr *tb[TCA_ACT_MAX + 1];
1179 const struct tc_action_ops *ops;
1180 struct tc_action *a;
1181 int index;
1182 int err;
1183
1184 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1185 tcf_action_policy, extack);
1186 if (err < 0)
1187 goto err_out;
1188
1189 err = -EINVAL;
1190 if (tb[TCA_ACT_INDEX] == NULL ||
1191 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1192 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1193 goto err_out;
1194 }
1195 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1196
1197 err = -EINVAL;
1198 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1199 if (!ops) { /* could happen in batch of actions */
1200 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1201 goto err_out;
1202 }
1203 err = -ENOENT;
1204 if (ops->lookup(net, &a, index) == 0) {
1205 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1206 goto err_mod;
1207 }
1208
1209 module_put(ops->owner);
1210 return a;
1211
1212 err_mod:
1213 module_put(ops->owner);
1214 err_out:
1215 return ERR_PTR(err);
1216 }
1217
1218 static int tca_action_flush(struct net *net, struct nlattr *nla,
1219 struct nlmsghdr *n, u32 portid,
1220 struct netlink_ext_ack *extack)
1221 {
1222 struct sk_buff *skb;
1223 unsigned char *b;
1224 struct nlmsghdr *nlh;
1225 struct tcamsg *t;
1226 struct netlink_callback dcb;
1227 struct nlattr *nest;
1228 struct nlattr *tb[TCA_ACT_MAX + 1];
1229 const struct tc_action_ops *ops;
1230 struct nlattr *kind;
1231 int err = -ENOMEM;
1232
1233 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1234 if (!skb)
1235 return err;
1236
1237 b = skb_tail_pointer(skb);
1238
1239 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1240 tcf_action_policy, extack);
1241 if (err < 0)
1242 goto err_out;
1243
1244 err = -EINVAL;
1245 kind = tb[TCA_ACT_KIND];
1246 ops = tc_lookup_action(kind);
1247 if (!ops) { /*some idjot trying to flush unknown action */
1248 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1249 goto err_out;
1250 }
1251
1252 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1253 sizeof(*t), 0);
1254 if (!nlh) {
1255 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1256 goto out_module_put;
1257 }
1258 t = nlmsg_data(nlh);
1259 t->tca_family = AF_UNSPEC;
1260 t->tca__pad1 = 0;
1261 t->tca__pad2 = 0;
1262
1263 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1264 if (!nest) {
1265 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1266 goto out_module_put;
1267 }
1268
1269 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1270 if (err <= 0) {
1271 nla_nest_cancel(skb, nest);
1272 goto out_module_put;
1273 }
1274
1275 nla_nest_end(skb, nest);
1276
1277 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1278 nlh->nlmsg_flags |= NLM_F_ROOT;
1279 module_put(ops->owner);
1280 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1281 n->nlmsg_flags & NLM_F_ECHO);
1282 if (err > 0)
1283 return 0;
1284 if (err < 0)
1285 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1286
1287 return err;
1288
1289 out_module_put:
1290 module_put(ops->owner);
1291 err_out:
1292 kfree_skb(skb);
1293 return err;
1294 }
1295
1296 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1297 {
1298 int i;
1299
1300 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1301 struct tc_action *a = actions[i];
1302 const struct tc_action_ops *ops = a->ops;
1303 /* Actions can be deleted concurrently so we must save their
1304 * type and id to search again after reference is released.
1305 */
1306 struct tcf_idrinfo *idrinfo = a->idrinfo;
1307 u32 act_index = a->tcfa_index;
1308
1309 actions[i] = NULL;
1310 if (tcf_action_put(a)) {
1311 /* last reference, action was deleted concurrently */
1312 module_put(ops->owner);
1313 } else {
1314 int ret;
1315
1316 /* now do the delete */
1317 ret = tcf_idr_delete_index(idrinfo, act_index);
1318 if (ret < 0)
1319 return ret;
1320 }
1321 }
1322 return 0;
1323 }
1324
1325 static int
1326 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1327 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1328 {
1329 int ret;
1330 struct sk_buff *skb;
1331
1332 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1333 GFP_KERNEL);
1334 if (!skb)
1335 return -ENOBUFS;
1336
1337 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1338 0, 2) <= 0) {
1339 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1340 kfree_skb(skb);
1341 return -EINVAL;
1342 }
1343
1344 /* now do the delete */
1345 ret = tcf_action_delete(net, actions);
1346 if (ret < 0) {
1347 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1348 kfree_skb(skb);
1349 return ret;
1350 }
1351
1352 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1353 n->nlmsg_flags & NLM_F_ECHO);
1354 if (ret > 0)
1355 return 0;
1356 return ret;
1357 }
1358
1359 static int
1360 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1361 u32 portid, int event, struct netlink_ext_ack *extack)
1362 {
1363 int i, ret;
1364 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1365 struct tc_action *act;
1366 size_t attr_size = 0;
1367 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1368
1369 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1370 extack);
1371 if (ret < 0)
1372 return ret;
1373
1374 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1375 if (tb[1])
1376 return tca_action_flush(net, tb[1], n, portid, extack);
1377
1378 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1379 return -EINVAL;
1380 }
1381
1382 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1383 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1384 if (IS_ERR(act)) {
1385 ret = PTR_ERR(act);
1386 goto err;
1387 }
1388 attr_size += tcf_action_fill_size(act);
1389 actions[i - 1] = act;
1390 }
1391
1392 attr_size = tcf_action_full_attrs_size(attr_size);
1393
1394 if (event == RTM_GETACTION)
1395 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1396 else { /* delete */
1397 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1398 if (ret)
1399 goto err;
1400 return 0;
1401 }
1402 err:
1403 tcf_action_put_many(actions);
1404 return ret;
1405 }
1406
1407 static int
1408 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1409 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1410 {
1411 struct sk_buff *skb;
1412 int err = 0;
1413
1414 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1415 GFP_KERNEL);
1416 if (!skb)
1417 return -ENOBUFS;
1418
1419 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1420 RTM_NEWACTION, 0, 0) <= 0) {
1421 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1422 kfree_skb(skb);
1423 return -EINVAL;
1424 }
1425
1426 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1427 n->nlmsg_flags & NLM_F_ECHO);
1428 if (err > 0)
1429 err = 0;
1430 return err;
1431 }
1432
1433 static int tcf_action_add(struct net *net, struct nlattr *nla,
1434 struct nlmsghdr *n, u32 portid, int ovr,
1435 struct netlink_ext_ack *extack)
1436 {
1437 size_t attr_size = 0;
1438 int loop, ret;
1439 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1440
1441 for (loop = 0; loop < 10; loop++) {
1442 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0,
1443 actions, &attr_size, true, extack);
1444 if (ret != -EAGAIN)
1445 break;
1446 }
1447
1448 if (ret < 0)
1449 return ret;
1450 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1451 if (ovr)
1452 tcf_action_put_many(actions);
1453
1454 return ret;
1455 }
1456
1457 static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1458 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1459 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1460 .validation_data = &tcaa_root_flags_allowed },
1461 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1462 };
1463
1464 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1465 struct netlink_ext_ack *extack)
1466 {
1467 struct net *net = sock_net(skb->sk);
1468 struct nlattr *tca[TCA_ROOT_MAX + 1];
1469 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1470 int ret = 0, ovr = 0;
1471
1472 if ((n->nlmsg_type != RTM_GETACTION) &&
1473 !netlink_capable(skb, CAP_NET_ADMIN))
1474 return -EPERM;
1475
1476 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
1477 TCA_ROOT_MAX, NULL, extack);
1478 if (ret < 0)
1479 return ret;
1480
1481 if (tca[TCA_ACT_TAB] == NULL) {
1482 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1483 return -EINVAL;
1484 }
1485
1486 /* n->nlmsg_flags & NLM_F_CREATE */
1487 switch (n->nlmsg_type) {
1488 case RTM_NEWACTION:
1489 /* we are going to assume all other flags
1490 * imply create only if it doesn't exist
1491 * Note that CREATE | EXCL implies that
1492 * but since we want avoid ambiguity (eg when flags
1493 * is zero) then just set this
1494 */
1495 if (n->nlmsg_flags & NLM_F_REPLACE)
1496 ovr = 1;
1497 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1498 extack);
1499 break;
1500 case RTM_DELACTION:
1501 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1502 portid, RTM_DELACTION, extack);
1503 break;
1504 case RTM_GETACTION:
1505 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1506 portid, RTM_GETACTION, extack);
1507 break;
1508 default:
1509 BUG();
1510 }
1511
1512 return ret;
1513 }
1514
1515 static struct nlattr *find_dump_kind(struct nlattr **nla)
1516 {
1517 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1518 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1519 struct nlattr *kind;
1520
1521 tb1 = nla[TCA_ACT_TAB];
1522 if (tb1 == NULL)
1523 return NULL;
1524
1525 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1526 return NULL;
1527
1528 if (tb[1] == NULL)
1529 return NULL;
1530 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
1531 return NULL;
1532 kind = tb2[TCA_ACT_KIND];
1533
1534 return kind;
1535 }
1536
1537 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1538 {
1539 struct net *net = sock_net(skb->sk);
1540 struct nlmsghdr *nlh;
1541 unsigned char *b = skb_tail_pointer(skb);
1542 struct nlattr *nest;
1543 struct tc_action_ops *a_o;
1544 int ret = 0;
1545 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1546 struct nlattr *tb[TCA_ROOT_MAX + 1];
1547 struct nlattr *count_attr = NULL;
1548 unsigned long jiffy_since = 0;
1549 struct nlattr *kind = NULL;
1550 struct nla_bitfield32 bf;
1551 u32 msecs_since = 0;
1552 u32 act_count = 0;
1553
1554 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
1555 TCA_ROOT_MAX, tcaa_policy, cb->extack);
1556 if (ret < 0)
1557 return ret;
1558
1559 kind = find_dump_kind(tb);
1560 if (kind == NULL) {
1561 pr_info("tc_dump_action: action bad kind\n");
1562 return 0;
1563 }
1564
1565 a_o = tc_lookup_action(kind);
1566 if (a_o == NULL)
1567 return 0;
1568
1569 cb->args[2] = 0;
1570 if (tb[TCA_ROOT_FLAGS]) {
1571 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1572 cb->args[2] = bf.value;
1573 }
1574
1575 if (tb[TCA_ROOT_TIME_DELTA]) {
1576 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1577 }
1578
1579 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1580 cb->nlh->nlmsg_type, sizeof(*t), 0);
1581 if (!nlh)
1582 goto out_module_put;
1583
1584 if (msecs_since)
1585 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1586
1587 t = nlmsg_data(nlh);
1588 t->tca_family = AF_UNSPEC;
1589 t->tca__pad1 = 0;
1590 t->tca__pad2 = 0;
1591 cb->args[3] = jiffy_since;
1592 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1593 if (!count_attr)
1594 goto out_module_put;
1595
1596 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1597 if (nest == NULL)
1598 goto out_module_put;
1599
1600 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1601 if (ret < 0)
1602 goto out_module_put;
1603
1604 if (ret > 0) {
1605 nla_nest_end(skb, nest);
1606 ret = skb->len;
1607 act_count = cb->args[1];
1608 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1609 cb->args[1] = 0;
1610 } else
1611 nlmsg_trim(skb, b);
1612
1613 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1614 if (NETLINK_CB(cb->skb).portid && ret)
1615 nlh->nlmsg_flags |= NLM_F_MULTI;
1616 module_put(a_o->owner);
1617 return skb->len;
1618
1619 out_module_put:
1620 module_put(a_o->owner);
1621 nlmsg_trim(skb, b);
1622 return skb->len;
1623 }
1624
1625 static int __init tc_action_init(void)
1626 {
1627 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1628 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1629 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1630 0);
1631
1632 return 0;
1633 }
1634
1635 subsys_initcall(tc_action_init);
Linux with added FPC-III support