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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/act_api.c Packet action API.
4 *
5 * Author: Jamal Hadi Salim
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/string.h>
11#include <linux/errno.h>
12#include <linux/slab.h>
13#include <linux/skbuff.h>
14#include <linux/init.h>
15#include <linux/kmod.h>
16#include <linux/err.h>
17#include <linux/module.h>
18#include <net/net_namespace.h>
19#include <net/sock.h>
20#include <net/sch_generic.h>
21#include <net/pkt_cls.h>
22#include <net/act_api.h>
23#include <net/netlink.h>
24
25static 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
33static 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
41static 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
51int 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 }
82end:
83 return ret;
84}
85EXPORT_SYMBOL(tcf_action_check_ctrlact);
86
87struct 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}
94EXPORT_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 */
101static 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
116static 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
125static 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
145int __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}
171EXPORT_SYMBOL(__tcf_idr_release);
172
173static 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
201static 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
209static 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
218static 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 if (IS_ERR(p))
239 continue;
240
241 if (jiffy_since &&
242 time_after(jiffy_since,
243 (unsigned long)p->tcfa_tm.lastuse))
244 continue;
245
246 nest = nla_nest_start_noflag(skb, n_i);
247 if (!nest) {
248 index--;
249 goto nla_put_failure;
250 }
251 err = tcf_action_dump_1(skb, p, 0, 0);
252 if (err < 0) {
253 index--;
254 nlmsg_trim(skb, nest);
255 goto done;
256 }
257 nla_nest_end(skb, nest);
258 n_i++;
259 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
260 n_i >= TCA_ACT_MAX_PRIO)
261 goto done;
262 }
263done:
264 if (index >= 0)
265 cb->args[0] = index + 1;
266
267 mutex_unlock(&idrinfo->lock);
268 if (n_i) {
269 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
270 cb->args[1] = n_i;
271 }
272 return n_i;
273
274nla_put_failure:
275 nla_nest_cancel(skb, nest);
276 goto done;
277}
278
279static int tcf_idr_release_unsafe(struct tc_action *p)
280{
281 if (atomic_read(&p->tcfa_bindcnt) > 0)
282 return -EPERM;
283
284 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
285 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
286 tcf_action_cleanup(p);
287 return ACT_P_DELETED;
288 }
289
290 return 0;
291}
292
293static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
294 const struct tc_action_ops *ops)
295{
296 struct nlattr *nest;
297 int n_i = 0;
298 int ret = -EINVAL;
299 struct idr *idr = &idrinfo->action_idr;
300 struct tc_action *p;
301 unsigned long id = 1;
302 unsigned long tmp;
303
304 nest = nla_nest_start_noflag(skb, 0);
305 if (nest == NULL)
306 goto nla_put_failure;
307 if (nla_put_string(skb, TCA_KIND, ops->kind))
308 goto nla_put_failure;
309
310 mutex_lock(&idrinfo->lock);
311 idr_for_each_entry_ul(idr, p, tmp, id) {
312 if (IS_ERR(p))
313 continue;
314 ret = tcf_idr_release_unsafe(p);
315 if (ret == ACT_P_DELETED) {
316 module_put(ops->owner);
317 n_i++;
318 } else if (ret < 0) {
319 mutex_unlock(&idrinfo->lock);
320 goto nla_put_failure;
321 }
322 }
323 mutex_unlock(&idrinfo->lock);
324
325 if (nla_put_u32(skb, TCA_FCNT, n_i))
326 goto nla_put_failure;
327 nla_nest_end(skb, nest);
328
329 return n_i;
330nla_put_failure:
331 nla_nest_cancel(skb, nest);
332 return ret;
333}
334
335int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
336 struct netlink_callback *cb, int type,
337 const struct tc_action_ops *ops,
338 struct netlink_ext_ack *extack)
339{
340 struct tcf_idrinfo *idrinfo = tn->idrinfo;
341
342 if (type == RTM_DELACTION) {
343 return tcf_del_walker(idrinfo, skb, ops);
344 } else if (type == RTM_GETACTION) {
345 return tcf_dump_walker(idrinfo, skb, cb);
346 } else {
347 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
348 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
349 return -EINVAL;
350 }
351}
352EXPORT_SYMBOL(tcf_generic_walker);
353
354int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
355{
356 struct tcf_idrinfo *idrinfo = tn->idrinfo;
357 struct tc_action *p;
358
359 mutex_lock(&idrinfo->lock);
360 p = idr_find(&idrinfo->action_idr, index);
361 if (IS_ERR(p))
362 p = NULL;
363 else if (p)
364 refcount_inc(&p->tcfa_refcnt);
365 mutex_unlock(&idrinfo->lock);
366
367 if (p) {
368 *a = p;
369 return true;
370 }
371 return false;
372}
373EXPORT_SYMBOL(tcf_idr_search);
374
375static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
376{
377 struct tc_action *p;
378 int ret = 0;
379
380 mutex_lock(&idrinfo->lock);
381 p = idr_find(&idrinfo->action_idr, index);
382 if (!p) {
383 mutex_unlock(&idrinfo->lock);
384 return -ENOENT;
385 }
386
387 if (!atomic_read(&p->tcfa_bindcnt)) {
388 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
389 struct module *owner = p->ops->owner;
390
391 WARN_ON(p != idr_remove(&idrinfo->action_idr,
392 p->tcfa_index));
393 mutex_unlock(&idrinfo->lock);
394
395 tcf_action_cleanup(p);
396 module_put(owner);
397 return 0;
398 }
399 ret = 0;
400 } else {
401 ret = -EPERM;
402 }
403
404 mutex_unlock(&idrinfo->lock);
405 return ret;
406}
407
408int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
409 struct tc_action **a, const struct tc_action_ops *ops,
410 int bind, bool cpustats, u32 flags)
411{
412 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
413 struct tcf_idrinfo *idrinfo = tn->idrinfo;
414 int err = -ENOMEM;
415
416 if (unlikely(!p))
417 return -ENOMEM;
418 refcount_set(&p->tcfa_refcnt, 1);
419 if (bind)
420 atomic_set(&p->tcfa_bindcnt, 1);
421
422 if (cpustats) {
423 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
424 if (!p->cpu_bstats)
425 goto err1;
426 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
427 if (!p->cpu_bstats_hw)
428 goto err2;
429 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
430 if (!p->cpu_qstats)
431 goto err3;
432 }
433 spin_lock_init(&p->tcfa_lock);
434 p->tcfa_index = index;
435 p->tcfa_tm.install = jiffies;
436 p->tcfa_tm.lastuse = jiffies;
437 p->tcfa_tm.firstuse = 0;
438 p->tcfa_flags = flags;
439 if (est) {
440 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
441 &p->tcfa_rate_est,
442 &p->tcfa_lock, NULL, est);
443 if (err)
444 goto err4;
445 }
446
447 p->idrinfo = idrinfo;
448 p->ops = ops;
449 *a = p;
450 return 0;
451err4:
452 free_percpu(p->cpu_qstats);
453err3:
454 free_percpu(p->cpu_bstats_hw);
455err2:
456 free_percpu(p->cpu_bstats);
457err1:
458 kfree(p);
459 return err;
460}
461EXPORT_SYMBOL(tcf_idr_create);
462
463int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
464 struct nlattr *est, struct tc_action **a,
465 const struct tc_action_ops *ops, int bind,
466 u32 flags)
467{
468 /* Set cpustats according to actions flags. */
469 return tcf_idr_create(tn, index, est, a, ops, bind,
470 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
471}
472EXPORT_SYMBOL(tcf_idr_create_from_flags);
473
474/* Cleanup idr index that was allocated but not initialized. */
475
476void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
477{
478 struct tcf_idrinfo *idrinfo = tn->idrinfo;
479
480 mutex_lock(&idrinfo->lock);
481 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
482 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
483 mutex_unlock(&idrinfo->lock);
484}
485EXPORT_SYMBOL(tcf_idr_cleanup);
486
487/* Check if action with specified index exists. If actions is found, increments
488 * its reference and bind counters, and return 1. Otherwise insert temporary
489 * error pointer (to prevent concurrent users from inserting actions with same
490 * index) and return 0.
491 */
492
493int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
494 struct tc_action **a, int bind)
495{
496 struct tcf_idrinfo *idrinfo = tn->idrinfo;
497 struct tc_action *p;
498 int ret;
499
500again:
501 mutex_lock(&idrinfo->lock);
502 if (*index) {
503 p = idr_find(&idrinfo->action_idr, *index);
504 if (IS_ERR(p)) {
505 /* This means that another process allocated
506 * index but did not assign the pointer yet.
507 */
508 mutex_unlock(&idrinfo->lock);
509 goto again;
510 }
511
512 if (p) {
513 refcount_inc(&p->tcfa_refcnt);
514 if (bind)
515 atomic_inc(&p->tcfa_bindcnt);
516 *a = p;
517 ret = 1;
518 } else {
519 *a = NULL;
520 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
521 *index, GFP_KERNEL);
522 if (!ret)
523 idr_replace(&idrinfo->action_idr,
524 ERR_PTR(-EBUSY), *index);
525 }
526 } else {
527 *index = 1;
528 *a = NULL;
529 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
530 UINT_MAX, GFP_KERNEL);
531 if (!ret)
532 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
533 *index);
534 }
535 mutex_unlock(&idrinfo->lock);
536 return ret;
537}
538EXPORT_SYMBOL(tcf_idr_check_alloc);
539
540void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
541 struct tcf_idrinfo *idrinfo)
542{
543 struct idr *idr = &idrinfo->action_idr;
544 struct tc_action *p;
545 int ret;
546 unsigned long id = 1;
547 unsigned long tmp;
548
549 idr_for_each_entry_ul(idr, p, tmp, id) {
550 ret = __tcf_idr_release(p, false, true);
551 if (ret == ACT_P_DELETED)
552 module_put(ops->owner);
553 else if (ret < 0)
554 return;
555 }
556 idr_destroy(&idrinfo->action_idr);
557}
558EXPORT_SYMBOL(tcf_idrinfo_destroy);
559
560static LIST_HEAD(act_base);
561static DEFINE_RWLOCK(act_mod_lock);
562
563int tcf_register_action(struct tc_action_ops *act,
564 struct pernet_operations *ops)
565{
566 struct tc_action_ops *a;
567 int ret;
568
569 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
570 return -EINVAL;
571
572 /* We have to register pernet ops before making the action ops visible,
573 * otherwise tcf_action_init_1() could get a partially initialized
574 * netns.
575 */
576 ret = register_pernet_subsys(ops);
577 if (ret)
578 return ret;
579
580 write_lock(&act_mod_lock);
581 list_for_each_entry(a, &act_base, head) {
582 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
583 write_unlock(&act_mod_lock);
584 unregister_pernet_subsys(ops);
585 return -EEXIST;
586 }
587 }
588 list_add_tail(&act->head, &act_base);
589 write_unlock(&act_mod_lock);
590
591 return 0;
592}
593EXPORT_SYMBOL(tcf_register_action);
594
595int tcf_unregister_action(struct tc_action_ops *act,
596 struct pernet_operations *ops)
597{
598 struct tc_action_ops *a;
599 int err = -ENOENT;
600
601 write_lock(&act_mod_lock);
602 list_for_each_entry(a, &act_base, head) {
603 if (a == act) {
604 list_del(&act->head);
605 err = 0;
606 break;
607 }
608 }
609 write_unlock(&act_mod_lock);
610 if (!err)
611 unregister_pernet_subsys(ops);
612 return err;
613}
614EXPORT_SYMBOL(tcf_unregister_action);
615
616/* lookup by name */
617static struct tc_action_ops *tc_lookup_action_n(char *kind)
618{
619 struct tc_action_ops *a, *res = NULL;
620
621 if (kind) {
622 read_lock(&act_mod_lock);
623 list_for_each_entry(a, &act_base, head) {
624 if (strcmp(kind, a->kind) == 0) {
625 if (try_module_get(a->owner))
626 res = a;
627 break;
628 }
629 }
630 read_unlock(&act_mod_lock);
631 }
632 return res;
633}
634
635/* lookup by nlattr */
636static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
637{
638 struct tc_action_ops *a, *res = NULL;
639
640 if (kind) {
641 read_lock(&act_mod_lock);
642 list_for_each_entry(a, &act_base, head) {
643 if (nla_strcmp(kind, a->kind) == 0) {
644 if (try_module_get(a->owner))
645 res = a;
646 break;
647 }
648 }
649 read_unlock(&act_mod_lock);
650 }
651 return res;
652}
653
654/*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
655#define TCA_ACT_MAX_PRIO_MASK 0x1FF
656int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
657 int nr_actions, struct tcf_result *res)
658{
659 u32 jmp_prgcnt = 0;
660 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
661 int i;
662 int ret = TC_ACT_OK;
663
664 if (skb_skip_tc_classify(skb))
665 return TC_ACT_OK;
666
667restart_act_graph:
668 for (i = 0; i < nr_actions; i++) {
669 const struct tc_action *a = actions[i];
670
671 if (jmp_prgcnt > 0) {
672 jmp_prgcnt -= 1;
673 continue;
674 }
675repeat:
676 ret = a->ops->act(skb, a, res);
677 if (ret == TC_ACT_REPEAT)
678 goto repeat; /* we need a ttl - JHS */
679
680 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
681 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
682 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
683 /* faulty opcode, stop pipeline */
684 return TC_ACT_OK;
685 } else {
686 jmp_ttl -= 1;
687 if (jmp_ttl > 0)
688 goto restart_act_graph;
689 else /* faulty graph, stop pipeline */
690 return TC_ACT_OK;
691 }
692 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
693 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
694 net_warn_ratelimited("can't go to NULL chain!\n");
695 return TC_ACT_SHOT;
696 }
697 tcf_action_goto_chain_exec(a, res);
698 }
699
700 if (ret != TC_ACT_PIPE)
701 break;
702 }
703
704 return ret;
705}
706EXPORT_SYMBOL(tcf_action_exec);
707
708int tcf_action_destroy(struct tc_action *actions[], int bind)
709{
710 const struct tc_action_ops *ops;
711 struct tc_action *a;
712 int ret = 0, i;
713
714 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
715 a = actions[i];
716 actions[i] = NULL;
717 ops = a->ops;
718 ret = __tcf_idr_release(a, bind, true);
719 if (ret == ACT_P_DELETED)
720 module_put(ops->owner);
721 else if (ret < 0)
722 return ret;
723 }
724 return ret;
725}
726
727static int tcf_action_put(struct tc_action *p)
728{
729 return __tcf_action_put(p, false);
730}
731
732/* Put all actions in this array, skip those NULL's. */
733static void tcf_action_put_many(struct tc_action *actions[])
734{
735 int i;
736
737 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
738 struct tc_action *a = actions[i];
739 const struct tc_action_ops *ops;
740
741 if (!a)
742 continue;
743 ops = a->ops;
744 if (tcf_action_put(a))
745 module_put(ops->owner);
746 }
747}
748
749int
750tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
751{
752 return a->ops->dump(skb, a, bind, ref);
753}
754
755static int
756tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a)
757{
758 unsigned char *b = skb_tail_pointer(skb);
759 struct tc_cookie *cookie;
760
761 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
762 goto nla_put_failure;
763 if (tcf_action_copy_stats(skb, a, 0))
764 goto nla_put_failure;
765
766 rcu_read_lock();
767 cookie = rcu_dereference(a->act_cookie);
768 if (cookie) {
769 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
770 rcu_read_unlock();
771 goto nla_put_failure;
772 }
773 }
774 rcu_read_unlock();
775
776 return 0;
777
778nla_put_failure:
779 nlmsg_trim(skb, b);
780 return -1;
781}
782
783int
784tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
785{
786 int err = -EINVAL;
787 unsigned char *b = skb_tail_pointer(skb);
788 struct nlattr *nest;
789
790 if (tcf_action_dump_terse(skb, a))
791 goto nla_put_failure;
792
793 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
794 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
795 a->hw_stats, TCA_ACT_HW_STATS_ANY))
796 goto nla_put_failure;
797
798 if (a->used_hw_stats_valid &&
799 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
800 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
801 goto nla_put_failure;
802
803 if (a->tcfa_flags &&
804 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
805 a->tcfa_flags, a->tcfa_flags))
806 goto nla_put_failure;
807
808 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
809 if (nest == NULL)
810 goto nla_put_failure;
811 err = tcf_action_dump_old(skb, a, bind, ref);
812 if (err > 0) {
813 nla_nest_end(skb, nest);
814 return err;
815 }
816
817nla_put_failure:
818 nlmsg_trim(skb, b);
819 return -1;
820}
821EXPORT_SYMBOL(tcf_action_dump_1);
822
823int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
824 int bind, int ref, bool terse)
825{
826 struct tc_action *a;
827 int err = -EINVAL, i;
828 struct nlattr *nest;
829
830 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
831 a = actions[i];
832 nest = nla_nest_start_noflag(skb, i + 1);
833 if (nest == NULL)
834 goto nla_put_failure;
835 err = terse ? tcf_action_dump_terse(skb, a) :
836 tcf_action_dump_1(skb, a, bind, ref);
837 if (err < 0)
838 goto errout;
839 nla_nest_end(skb, nest);
840 }
841
842 return 0;
843
844nla_put_failure:
845 err = -EINVAL;
846errout:
847 nla_nest_cancel(skb, nest);
848 return err;
849}
850
851static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
852{
853 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
854 if (!c)
855 return NULL;
856
857 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
858 if (!c->data) {
859 kfree(c);
860 return NULL;
861 }
862 c->len = nla_len(tb[TCA_ACT_COOKIE]);
863
864 return c;
865}
866
867static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
868{
869 struct nla_bitfield32 hw_stats_bf;
870
871 /* If the user did not pass the attr, that means he does
872 * not care about the type. Return "any" in that case
873 * which is setting on all supported types.
874 */
875 if (!hw_stats_attr)
876 return TCA_ACT_HW_STATS_ANY;
877 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
878 return hw_stats_bf.value;
879}
880
881static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
882 [TCA_ACT_KIND] = { .type = NLA_STRING },
883 [TCA_ACT_INDEX] = { .type = NLA_U32 },
884 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
885 .len = TC_COOKIE_MAX_SIZE },
886 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
887 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS),
888 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
889};
890
891static void tcf_idr_insert_many(struct tc_action *actions[])
892{
893 int i;
894
895 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
896 struct tc_action *a = actions[i];
897 struct tcf_idrinfo *idrinfo;
898
899 if (!a)
900 continue;
901 idrinfo = a->idrinfo;
902 mutex_lock(&idrinfo->lock);
903 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if
904 * it is just created, otherwise this is just a nop.
905 */
906 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
907 mutex_unlock(&idrinfo->lock);
908 }
909}
910
911struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
912 struct nlattr *nla, struct nlattr *est,
913 char *name, int ovr, int bind,
914 bool rtnl_held,
915 struct netlink_ext_ack *extack)
916{
917 struct nla_bitfield32 flags = { 0, 0 };
918 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
919 struct tc_action *a;
920 struct tc_action_ops *a_o;
921 struct tc_cookie *cookie = NULL;
922 char act_name[IFNAMSIZ];
923 struct nlattr *tb[TCA_ACT_MAX + 1];
924 struct nlattr *kind;
925 int err;
926
927 if (name == NULL) {
928 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
929 tcf_action_policy, extack);
930 if (err < 0)
931 goto err_out;
932 err = -EINVAL;
933 kind = tb[TCA_ACT_KIND];
934 if (!kind) {
935 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
936 goto err_out;
937 }
938 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
939 NL_SET_ERR_MSG(extack, "TC action name too long");
940 goto err_out;
941 }
942 if (tb[TCA_ACT_COOKIE]) {
943 cookie = nla_memdup_cookie(tb);
944 if (!cookie) {
945 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
946 err = -ENOMEM;
947 goto err_out;
948 }
949 }
950 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
951 if (tb[TCA_ACT_FLAGS])
952 flags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
953 } else {
954 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
955 NL_SET_ERR_MSG(extack, "TC action name too long");
956 err = -EINVAL;
957 goto err_out;
958 }
959 }
960
961 a_o = tc_lookup_action_n(act_name);
962 if (a_o == NULL) {
963#ifdef CONFIG_MODULES
964 if (rtnl_held)
965 rtnl_unlock();
966 request_module("act_%s", act_name);
967 if (rtnl_held)
968 rtnl_lock();
969
970 a_o = tc_lookup_action_n(act_name);
971
972 /* We dropped the RTNL semaphore in order to
973 * perform the module load. So, even if we
974 * succeeded in loading the module we have to
975 * tell the caller to replay the request. We
976 * indicate this using -EAGAIN.
977 */
978 if (a_o != NULL) {
979 err = -EAGAIN;
980 goto err_mod;
981 }
982#endif
983 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
984 err = -ENOENT;
985 goto err_out;
986 }
987
988 /* backward compatibility for policer */
989 if (name == NULL)
990 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
991 rtnl_held, tp, flags.value, extack);
992 else
993 err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
994 tp, flags.value, extack);
995 if (err < 0)
996 goto err_mod;
997
998 if (!name && tb[TCA_ACT_COOKIE])
999 tcf_set_action_cookie(&a->act_cookie, cookie);
1000
1001 if (!name)
1002 a->hw_stats = hw_stats;
1003
1004 /* module count goes up only when brand new policy is created
1005 * if it exists and is only bound to in a_o->init() then
1006 * ACT_P_CREATED is not returned (a zero is).
1007 */
1008 if (err != ACT_P_CREATED)
1009 module_put(a_o->owner);
1010
1011 return a;
1012
1013err_mod:
1014 module_put(a_o->owner);
1015err_out:
1016 if (cookie) {
1017 kfree(cookie->data);
1018 kfree(cookie);
1019 }
1020 return ERR_PTR(err);
1021}
1022
1023/* Returns numbers of initialized actions or negative error. */
1024
1025int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1026 struct nlattr *est, char *name, int ovr, int bind,
1027 struct tc_action *actions[], size_t *attr_size,
1028 bool rtnl_held, struct netlink_ext_ack *extack)
1029{
1030 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1031 struct tc_action *act;
1032 size_t sz = 0;
1033 int err;
1034 int i;
1035
1036 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1037 extack);
1038 if (err < 0)
1039 return err;
1040
1041 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1042 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
1043 rtnl_held, extack);
1044 if (IS_ERR(act)) {
1045 err = PTR_ERR(act);
1046 goto err;
1047 }
1048 sz += tcf_action_fill_size(act);
1049 /* Start from index 0 */
1050 actions[i - 1] = act;
1051 }
1052
1053 /* We have to commit them all together, because if any error happened in
1054 * between, we could not handle the failure gracefully.
1055 */
1056 tcf_idr_insert_many(actions);
1057
1058 *attr_size = tcf_action_full_attrs_size(sz);
1059 return i - 1;
1060
1061err:
1062 tcf_action_destroy(actions, bind);
1063 return err;
1064}
1065
1066void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1067 u64 drops, bool hw)
1068{
1069 if (a->cpu_bstats) {
1070 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1071
1072 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1073
1074 if (hw)
1075 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
1076 bytes, packets);
1077 return;
1078 }
1079
1080 _bstats_update(&a->tcfa_bstats, bytes, packets);
1081 a->tcfa_qstats.drops += drops;
1082 if (hw)
1083 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1084}
1085EXPORT_SYMBOL(tcf_action_update_stats);
1086
1087int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1088 int compat_mode)
1089{
1090 int err = 0;
1091 struct gnet_dump d;
1092
1093 if (p == NULL)
1094 goto errout;
1095
1096 /* compat_mode being true specifies a call that is supposed
1097 * to add additional backward compatibility statistic TLVs.
1098 */
1099 if (compat_mode) {
1100 if (p->type == TCA_OLD_COMPAT)
1101 err = gnet_stats_start_copy_compat(skb, 0,
1102 TCA_STATS,
1103 TCA_XSTATS,
1104 &p->tcfa_lock, &d,
1105 TCA_PAD);
1106 else
1107 return 0;
1108 } else
1109 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1110 &p->tcfa_lock, &d, TCA_ACT_PAD);
1111
1112 if (err < 0)
1113 goto errout;
1114
1115 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
1116 gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
1117 &p->tcfa_bstats_hw) < 0 ||
1118 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1119 gnet_stats_copy_queue(&d, p->cpu_qstats,
1120 &p->tcfa_qstats,
1121 p->tcfa_qstats.qlen) < 0)
1122 goto errout;
1123
1124 if (gnet_stats_finish_copy(&d) < 0)
1125 goto errout;
1126
1127 return 0;
1128
1129errout:
1130 return -1;
1131}
1132
1133static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1134 u32 portid, u32 seq, u16 flags, int event, int bind,
1135 int ref)
1136{
1137 struct tcamsg *t;
1138 struct nlmsghdr *nlh;
1139 unsigned char *b = skb_tail_pointer(skb);
1140 struct nlattr *nest;
1141
1142 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1143 if (!nlh)
1144 goto out_nlmsg_trim;
1145 t = nlmsg_data(nlh);
1146 t->tca_family = AF_UNSPEC;
1147 t->tca__pad1 = 0;
1148 t->tca__pad2 = 0;
1149
1150 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1151 if (!nest)
1152 goto out_nlmsg_trim;
1153
1154 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1155 goto out_nlmsg_trim;
1156
1157 nla_nest_end(skb, nest);
1158
1159 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1160 return skb->len;
1161
1162out_nlmsg_trim:
1163 nlmsg_trim(skb, b);
1164 return -1;
1165}
1166
1167static int
1168tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1169 struct tc_action *actions[], int event,
1170 struct netlink_ext_ack *extack)
1171{
1172 struct sk_buff *skb;
1173
1174 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1175 if (!skb)
1176 return -ENOBUFS;
1177 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1178 0, 1) <= 0) {
1179 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1180 kfree_skb(skb);
1181 return -EINVAL;
1182 }
1183
1184 return rtnl_unicast(skb, net, portid);
1185}
1186
1187static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1188 struct nlmsghdr *n, u32 portid,
1189 struct netlink_ext_ack *extack)
1190{
1191 struct nlattr *tb[TCA_ACT_MAX + 1];
1192 const struct tc_action_ops *ops;
1193 struct tc_action *a;
1194 int index;
1195 int err;
1196
1197 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1198 tcf_action_policy, extack);
1199 if (err < 0)
1200 goto err_out;
1201
1202 err = -EINVAL;
1203 if (tb[TCA_ACT_INDEX] == NULL ||
1204 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1205 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1206 goto err_out;
1207 }
1208 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1209
1210 err = -EINVAL;
1211 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1212 if (!ops) { /* could happen in batch of actions */
1213 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1214 goto err_out;
1215 }
1216 err = -ENOENT;
1217 if (ops->lookup(net, &a, index) == 0) {
1218 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1219 goto err_mod;
1220 }
1221
1222 module_put(ops->owner);
1223 return a;
1224
1225err_mod:
1226 module_put(ops->owner);
1227err_out:
1228 return ERR_PTR(err);
1229}
1230
1231static int tca_action_flush(struct net *net, struct nlattr *nla,
1232 struct nlmsghdr *n, u32 portid,
1233 struct netlink_ext_ack *extack)
1234{
1235 struct sk_buff *skb;
1236 unsigned char *b;
1237 struct nlmsghdr *nlh;
1238 struct tcamsg *t;
1239 struct netlink_callback dcb;
1240 struct nlattr *nest;
1241 struct nlattr *tb[TCA_ACT_MAX + 1];
1242 const struct tc_action_ops *ops;
1243 struct nlattr *kind;
1244 int err = -ENOMEM;
1245
1246 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1247 if (!skb)
1248 return err;
1249
1250 b = skb_tail_pointer(skb);
1251
1252 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1253 tcf_action_policy, extack);
1254 if (err < 0)
1255 goto err_out;
1256
1257 err = -EINVAL;
1258 kind = tb[TCA_ACT_KIND];
1259 ops = tc_lookup_action(kind);
1260 if (!ops) { /*some idjot trying to flush unknown action */
1261 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1262 goto err_out;
1263 }
1264
1265 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1266 sizeof(*t), 0);
1267 if (!nlh) {
1268 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1269 goto out_module_put;
1270 }
1271 t = nlmsg_data(nlh);
1272 t->tca_family = AF_UNSPEC;
1273 t->tca__pad1 = 0;
1274 t->tca__pad2 = 0;
1275
1276 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1277 if (!nest) {
1278 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1279 goto out_module_put;
1280 }
1281
1282 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1283 if (err <= 0) {
1284 nla_nest_cancel(skb, nest);
1285 goto out_module_put;
1286 }
1287
1288 nla_nest_end(skb, nest);
1289
1290 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1291 nlh->nlmsg_flags |= NLM_F_ROOT;
1292 module_put(ops->owner);
1293 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1294 n->nlmsg_flags & NLM_F_ECHO);
1295 if (err > 0)
1296 return 0;
1297 if (err < 0)
1298 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1299
1300 return err;
1301
1302out_module_put:
1303 module_put(ops->owner);
1304err_out:
1305 kfree_skb(skb);
1306 return err;
1307}
1308
1309static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1310{
1311 int i;
1312
1313 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1314 struct tc_action *a = actions[i];
1315 const struct tc_action_ops *ops = a->ops;
1316 /* Actions can be deleted concurrently so we must save their
1317 * type and id to search again after reference is released.
1318 */
1319 struct tcf_idrinfo *idrinfo = a->idrinfo;
1320 u32 act_index = a->tcfa_index;
1321
1322 actions[i] = NULL;
1323 if (tcf_action_put(a)) {
1324 /* last reference, action was deleted concurrently */
1325 module_put(ops->owner);
1326 } else {
1327 int ret;
1328
1329 /* now do the delete */
1330 ret = tcf_idr_delete_index(idrinfo, act_index);
1331 if (ret < 0)
1332 return ret;
1333 }
1334 }
1335 return 0;
1336}
1337
1338static int
1339tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1340 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1341{
1342 int ret;
1343 struct sk_buff *skb;
1344
1345 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1346 GFP_KERNEL);
1347 if (!skb)
1348 return -ENOBUFS;
1349
1350 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1351 0, 2) <= 0) {
1352 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1353 kfree_skb(skb);
1354 return -EINVAL;
1355 }
1356
1357 /* now do the delete */
1358 ret = tcf_action_delete(net, actions);
1359 if (ret < 0) {
1360 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1361 kfree_skb(skb);
1362 return ret;
1363 }
1364
1365 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1366 n->nlmsg_flags & NLM_F_ECHO);
1367 if (ret > 0)
1368 return 0;
1369 return ret;
1370}
1371
1372static int
1373tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1374 u32 portid, int event, struct netlink_ext_ack *extack)
1375{
1376 int i, ret;
1377 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1378 struct tc_action *act;
1379 size_t attr_size = 0;
1380 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1381
1382 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1383 extack);
1384 if (ret < 0)
1385 return ret;
1386
1387 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1388 if (tb[1])
1389 return tca_action_flush(net, tb[1], n, portid, extack);
1390
1391 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1392 return -EINVAL;
1393 }
1394
1395 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1396 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1397 if (IS_ERR(act)) {
1398 ret = PTR_ERR(act);
1399 goto err;
1400 }
1401 attr_size += tcf_action_fill_size(act);
1402 actions[i - 1] = act;
1403 }
1404
1405 attr_size = tcf_action_full_attrs_size(attr_size);
1406
1407 if (event == RTM_GETACTION)
1408 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1409 else { /* delete */
1410 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1411 if (ret)
1412 goto err;
1413 return 0;
1414 }
1415err:
1416 tcf_action_put_many(actions);
1417 return ret;
1418}
1419
1420static int
1421tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1422 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1423{
1424 struct sk_buff *skb;
1425 int err = 0;
1426
1427 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1428 GFP_KERNEL);
1429 if (!skb)
1430 return -ENOBUFS;
1431
1432 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1433 RTM_NEWACTION, 0, 0) <= 0) {
1434 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1435 kfree_skb(skb);
1436 return -EINVAL;
1437 }
1438
1439 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1440 n->nlmsg_flags & NLM_F_ECHO);
1441 if (err > 0)
1442 err = 0;
1443 return err;
1444}
1445
1446static int tcf_action_add(struct net *net, struct nlattr *nla,
1447 struct nlmsghdr *n, u32 portid, int ovr,
1448 struct netlink_ext_ack *extack)
1449{
1450 size_t attr_size = 0;
1451 int loop, ret;
1452 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1453
1454 for (loop = 0; loop < 10; loop++) {
1455 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0,
1456 actions, &attr_size, true, extack);
1457 if (ret != -EAGAIN)
1458 break;
1459 }
1460
1461 if (ret < 0)
1462 return ret;
1463 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1464 if (ovr)
1465 tcf_action_put_many(actions);
1466
1467 return ret;
1468}
1469
1470static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1471 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_FLAG_LARGE_DUMP_ON),
1472 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1473};
1474
1475static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1476 struct netlink_ext_ack *extack)
1477{
1478 struct net *net = sock_net(skb->sk);
1479 struct nlattr *tca[TCA_ROOT_MAX + 1];
1480 u32 portid = NETLINK_CB(skb).portid;
1481 int ret = 0, ovr = 0;
1482
1483 if ((n->nlmsg_type != RTM_GETACTION) &&
1484 !netlink_capable(skb, CAP_NET_ADMIN))
1485 return -EPERM;
1486
1487 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
1488 TCA_ROOT_MAX, NULL, extack);
1489 if (ret < 0)
1490 return ret;
1491
1492 if (tca[TCA_ACT_TAB] == NULL) {
1493 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1494 return -EINVAL;
1495 }
1496
1497 /* n->nlmsg_flags & NLM_F_CREATE */
1498 switch (n->nlmsg_type) {
1499 case RTM_NEWACTION:
1500 /* we are going to assume all other flags
1501 * imply create only if it doesn't exist
1502 * Note that CREATE | EXCL implies that
1503 * but since we want avoid ambiguity (eg when flags
1504 * is zero) then just set this
1505 */
1506 if (n->nlmsg_flags & NLM_F_REPLACE)
1507 ovr = 1;
1508 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1509 extack);
1510 break;
1511 case RTM_DELACTION:
1512 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1513 portid, RTM_DELACTION, extack);
1514 break;
1515 case RTM_GETACTION:
1516 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1517 portid, RTM_GETACTION, extack);
1518 break;
1519 default:
1520 BUG();
1521 }
1522
1523 return ret;
1524}
1525
1526static struct nlattr *find_dump_kind(struct nlattr **nla)
1527{
1528 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1529 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1530 struct nlattr *kind;
1531
1532 tb1 = nla[TCA_ACT_TAB];
1533 if (tb1 == NULL)
1534 return NULL;
1535
1536 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1537 return NULL;
1538
1539 if (tb[1] == NULL)
1540 return NULL;
1541 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
1542 return NULL;
1543 kind = tb2[TCA_ACT_KIND];
1544
1545 return kind;
1546}
1547
1548static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1549{
1550 struct net *net = sock_net(skb->sk);
1551 struct nlmsghdr *nlh;
1552 unsigned char *b = skb_tail_pointer(skb);
1553 struct nlattr *nest;
1554 struct tc_action_ops *a_o;
1555 int ret = 0;
1556 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1557 struct nlattr *tb[TCA_ROOT_MAX + 1];
1558 struct nlattr *count_attr = NULL;
1559 unsigned long jiffy_since = 0;
1560 struct nlattr *kind = NULL;
1561 struct nla_bitfield32 bf;
1562 u32 msecs_since = 0;
1563 u32 act_count = 0;
1564
1565 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
1566 TCA_ROOT_MAX, tcaa_policy, cb->extack);
1567 if (ret < 0)
1568 return ret;
1569
1570 kind = find_dump_kind(tb);
1571 if (kind == NULL) {
1572 pr_info("tc_dump_action: action bad kind\n");
1573 return 0;
1574 }
1575
1576 a_o = tc_lookup_action(kind);
1577 if (a_o == NULL)
1578 return 0;
1579
1580 cb->args[2] = 0;
1581 if (tb[TCA_ROOT_FLAGS]) {
1582 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1583 cb->args[2] = bf.value;
1584 }
1585
1586 if (tb[TCA_ROOT_TIME_DELTA]) {
1587 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1588 }
1589
1590 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1591 cb->nlh->nlmsg_type, sizeof(*t), 0);
1592 if (!nlh)
1593 goto out_module_put;
1594
1595 if (msecs_since)
1596 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1597
1598 t = nlmsg_data(nlh);
1599 t->tca_family = AF_UNSPEC;
1600 t->tca__pad1 = 0;
1601 t->tca__pad2 = 0;
1602 cb->args[3] = jiffy_since;
1603 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1604 if (!count_attr)
1605 goto out_module_put;
1606
1607 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1608 if (nest == NULL)
1609 goto out_module_put;
1610
1611 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1612 if (ret < 0)
1613 goto out_module_put;
1614
1615 if (ret > 0) {
1616 nla_nest_end(skb, nest);
1617 ret = skb->len;
1618 act_count = cb->args[1];
1619 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1620 cb->args[1] = 0;
1621 } else
1622 nlmsg_trim(skb, b);
1623
1624 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1625 if (NETLINK_CB(cb->skb).portid && ret)
1626 nlh->nlmsg_flags |= NLM_F_MULTI;
1627 module_put(a_o->owner);
1628 return skb->len;
1629
1630out_module_put:
1631 module_put(a_o->owner);
1632 nlmsg_trim(skb, b);
1633 return skb->len;
1634}
1635
1636static int __init tc_action_init(void)
1637{
1638 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1639 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1640 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1641 0);
1642
1643 return 0;
1644}
1645
1646subsys_initcall(tc_action_init);
1/*
2 * net/sched/act_api.c Packet action API.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Author: Jamal Hadi Salim
10 *
11 *
12 */
13
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/errno.h>
18#include <linux/slab.h>
19#include <linux/skbuff.h>
20#include <linux/init.h>
21#include <linux/kmod.h>
22#include <linux/err.h>
23#include <linux/module.h>
24#include <linux/rhashtable.h>
25#include <linux/list.h>
26#include <net/net_namespace.h>
27#include <net/sock.h>
28#include <net/sch_generic.h>
29#include <net/pkt_cls.h>
30#include <net/act_api.h>
31#include <net/netlink.h>
32
33static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp)
34{
35 u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK;
36
37 if (!tp)
38 return -EINVAL;
39 a->goto_chain = tcf_chain_get(tp->chain->block, chain_index, true);
40 if (!a->goto_chain)
41 return -ENOMEM;
42 return 0;
43}
44
45static void tcf_action_goto_chain_fini(struct tc_action *a)
46{
47 tcf_chain_put(a->goto_chain);
48}
49
50static void tcf_action_goto_chain_exec(const struct tc_action *a,
51 struct tcf_result *res)
52{
53 const struct tcf_chain *chain = a->goto_chain;
54
55 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
56}
57
58/* XXX: For standalone actions, we don't need a RCU grace period either, because
59 * actions are always connected to filters and filters are already destroyed in
60 * RCU callbacks, so after a RCU grace period actions are already disconnected
61 * from filters. Readers later can not find us.
62 */
63static void free_tcf(struct tc_action *p)
64{
65 free_percpu(p->cpu_bstats);
66 free_percpu(p->cpu_qstats);
67
68 if (p->act_cookie) {
69 kfree(p->act_cookie->data);
70 kfree(p->act_cookie);
71 }
72 if (p->goto_chain)
73 tcf_action_goto_chain_fini(p);
74
75 kfree(p);
76}
77
78static void tcf_idr_remove(struct tcf_idrinfo *idrinfo, struct tc_action *p)
79{
80 spin_lock_bh(&idrinfo->lock);
81 idr_remove(&idrinfo->action_idr, p->tcfa_index);
82 spin_unlock_bh(&idrinfo->lock);
83 gen_kill_estimator(&p->tcfa_rate_est);
84 free_tcf(p);
85}
86
87int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
88{
89 int ret = 0;
90
91 ASSERT_RTNL();
92
93 if (p) {
94 if (bind)
95 p->tcfa_bindcnt--;
96 else if (strict && p->tcfa_bindcnt > 0)
97 return -EPERM;
98
99 p->tcfa_refcnt--;
100 if (p->tcfa_bindcnt <= 0 && p->tcfa_refcnt <= 0) {
101 if (p->ops->cleanup)
102 p->ops->cleanup(p);
103 tcf_idr_remove(p->idrinfo, p);
104 ret = ACT_P_DELETED;
105 }
106 }
107
108 return ret;
109}
110EXPORT_SYMBOL(__tcf_idr_release);
111
112static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
113{
114 u32 cookie_len = 0;
115
116 if (act->act_cookie)
117 cookie_len = nla_total_size(act->act_cookie->len);
118
119 return nla_total_size(0) /* action number nested */
120 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
121 + cookie_len /* TCA_ACT_COOKIE */
122 + nla_total_size(0) /* TCA_ACT_STATS nested */
123 /* TCA_STATS_BASIC */
124 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
125 /* TCA_STATS_QUEUE */
126 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
127 + nla_total_size(0) /* TCA_OPTIONS nested */
128 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
129}
130
131static size_t tcf_action_full_attrs_size(size_t sz)
132{
133 return NLMSG_HDRLEN /* struct nlmsghdr */
134 + sizeof(struct tcamsg)
135 + nla_total_size(0) /* TCA_ACT_TAB nested */
136 + sz;
137}
138
139static size_t tcf_action_fill_size(const struct tc_action *act)
140{
141 size_t sz = tcf_action_shared_attrs_size(act);
142
143 if (act->ops->get_fill_size)
144 return act->ops->get_fill_size(act) + sz;
145 return sz;
146}
147
148static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
149 struct netlink_callback *cb)
150{
151 int err = 0, index = -1, s_i = 0, n_i = 0;
152 u32 act_flags = cb->args[2];
153 unsigned long jiffy_since = cb->args[3];
154 struct nlattr *nest;
155 struct idr *idr = &idrinfo->action_idr;
156 struct tc_action *p;
157 unsigned long id = 1;
158
159 spin_lock_bh(&idrinfo->lock);
160
161 s_i = cb->args[0];
162
163 idr_for_each_entry_ul(idr, p, id) {
164 index++;
165 if (index < s_i)
166 continue;
167
168 if (jiffy_since &&
169 time_after(jiffy_since,
170 (unsigned long)p->tcfa_tm.lastuse))
171 continue;
172
173 nest = nla_nest_start(skb, n_i);
174 if (!nest) {
175 index--;
176 goto nla_put_failure;
177 }
178 err = tcf_action_dump_1(skb, p, 0, 0);
179 if (err < 0) {
180 index--;
181 nlmsg_trim(skb, nest);
182 goto done;
183 }
184 nla_nest_end(skb, nest);
185 n_i++;
186 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
187 n_i >= TCA_ACT_MAX_PRIO)
188 goto done;
189 }
190done:
191 if (index >= 0)
192 cb->args[0] = index + 1;
193
194 spin_unlock_bh(&idrinfo->lock);
195 if (n_i) {
196 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
197 cb->args[1] = n_i;
198 }
199 return n_i;
200
201nla_put_failure:
202 nla_nest_cancel(skb, nest);
203 goto done;
204}
205
206static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
207 const struct tc_action_ops *ops)
208{
209 struct nlattr *nest;
210 int n_i = 0;
211 int ret = -EINVAL;
212 struct idr *idr = &idrinfo->action_idr;
213 struct tc_action *p;
214 unsigned long id = 1;
215
216 nest = nla_nest_start(skb, 0);
217 if (nest == NULL)
218 goto nla_put_failure;
219 if (nla_put_string(skb, TCA_KIND, ops->kind))
220 goto nla_put_failure;
221
222 idr_for_each_entry_ul(idr, p, id) {
223 ret = __tcf_idr_release(p, false, true);
224 if (ret == ACT_P_DELETED) {
225 module_put(ops->owner);
226 n_i++;
227 } else if (ret < 0) {
228 goto nla_put_failure;
229 }
230 }
231 if (nla_put_u32(skb, TCA_FCNT, n_i))
232 goto nla_put_failure;
233 nla_nest_end(skb, nest);
234
235 return n_i;
236nla_put_failure:
237 nla_nest_cancel(skb, nest);
238 return ret;
239}
240
241int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
242 struct netlink_callback *cb, int type,
243 const struct tc_action_ops *ops,
244 struct netlink_ext_ack *extack)
245{
246 struct tcf_idrinfo *idrinfo = tn->idrinfo;
247
248 if (type == RTM_DELACTION) {
249 return tcf_del_walker(idrinfo, skb, ops);
250 } else if (type == RTM_GETACTION) {
251 return tcf_dump_walker(idrinfo, skb, cb);
252 } else {
253 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
254 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
255 return -EINVAL;
256 }
257}
258EXPORT_SYMBOL(tcf_generic_walker);
259
260static struct tc_action *tcf_idr_lookup(u32 index, struct tcf_idrinfo *idrinfo)
261{
262 struct tc_action *p = NULL;
263
264 spin_lock_bh(&idrinfo->lock);
265 p = idr_find(&idrinfo->action_idr, index);
266 spin_unlock_bh(&idrinfo->lock);
267
268 return p;
269}
270
271int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
272{
273 struct tcf_idrinfo *idrinfo = tn->idrinfo;
274 struct tc_action *p = tcf_idr_lookup(index, idrinfo);
275
276 if (p) {
277 *a = p;
278 return 1;
279 }
280 return 0;
281}
282EXPORT_SYMBOL(tcf_idr_search);
283
284bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
285 int bind)
286{
287 struct tcf_idrinfo *idrinfo = tn->idrinfo;
288 struct tc_action *p = tcf_idr_lookup(index, idrinfo);
289
290 if (index && p) {
291 if (bind)
292 p->tcfa_bindcnt++;
293 p->tcfa_refcnt++;
294 *a = p;
295 return true;
296 }
297 return false;
298}
299EXPORT_SYMBOL(tcf_idr_check);
300
301int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
302 struct tc_action **a, const struct tc_action_ops *ops,
303 int bind, bool cpustats)
304{
305 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
306 struct tcf_idrinfo *idrinfo = tn->idrinfo;
307 struct idr *idr = &idrinfo->action_idr;
308 int err = -ENOMEM;
309
310 if (unlikely(!p))
311 return -ENOMEM;
312 p->tcfa_refcnt = 1;
313 if (bind)
314 p->tcfa_bindcnt = 1;
315
316 if (cpustats) {
317 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
318 if (!p->cpu_bstats)
319 goto err1;
320 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
321 if (!p->cpu_qstats)
322 goto err2;
323 }
324 spin_lock_init(&p->tcfa_lock);
325 idr_preload(GFP_KERNEL);
326 spin_lock_bh(&idrinfo->lock);
327 /* user doesn't specify an index */
328 if (!index) {
329 index = 1;
330 err = idr_alloc_u32(idr, NULL, &index, UINT_MAX, GFP_ATOMIC);
331 } else {
332 err = idr_alloc_u32(idr, NULL, &index, index, GFP_ATOMIC);
333 }
334 spin_unlock_bh(&idrinfo->lock);
335 idr_preload_end();
336 if (err)
337 goto err3;
338
339 p->tcfa_index = index;
340 p->tcfa_tm.install = jiffies;
341 p->tcfa_tm.lastuse = jiffies;
342 p->tcfa_tm.firstuse = 0;
343 if (est) {
344 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
345 &p->tcfa_rate_est,
346 &p->tcfa_lock, NULL, est);
347 if (err)
348 goto err4;
349 }
350
351 p->idrinfo = idrinfo;
352 p->ops = ops;
353 INIT_LIST_HEAD(&p->list);
354 *a = p;
355 return 0;
356err4:
357 idr_remove(idr, index);
358err3:
359 free_percpu(p->cpu_qstats);
360err2:
361 free_percpu(p->cpu_bstats);
362err1:
363 kfree(p);
364 return err;
365}
366EXPORT_SYMBOL(tcf_idr_create);
367
368void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
369{
370 struct tcf_idrinfo *idrinfo = tn->idrinfo;
371
372 spin_lock_bh(&idrinfo->lock);
373 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
374 spin_unlock_bh(&idrinfo->lock);
375}
376EXPORT_SYMBOL(tcf_idr_insert);
377
378void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
379 struct tcf_idrinfo *idrinfo)
380{
381 struct idr *idr = &idrinfo->action_idr;
382 struct tc_action *p;
383 int ret;
384 unsigned long id = 1;
385
386 idr_for_each_entry_ul(idr, p, id) {
387 ret = __tcf_idr_release(p, false, true);
388 if (ret == ACT_P_DELETED)
389 module_put(ops->owner);
390 else if (ret < 0)
391 return;
392 }
393 idr_destroy(&idrinfo->action_idr);
394}
395EXPORT_SYMBOL(tcf_idrinfo_destroy);
396
397static LIST_HEAD(act_base);
398static DEFINE_RWLOCK(act_mod_lock);
399
400int tcf_register_action(struct tc_action_ops *act,
401 struct pernet_operations *ops)
402{
403 struct tc_action_ops *a;
404 int ret;
405
406 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
407 return -EINVAL;
408
409 /* We have to register pernet ops before making the action ops visible,
410 * otherwise tcf_action_init_1() could get a partially initialized
411 * netns.
412 */
413 ret = register_pernet_subsys(ops);
414 if (ret)
415 return ret;
416
417 write_lock(&act_mod_lock);
418 list_for_each_entry(a, &act_base, head) {
419 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
420 write_unlock(&act_mod_lock);
421 unregister_pernet_subsys(ops);
422 return -EEXIST;
423 }
424 }
425 list_add_tail(&act->head, &act_base);
426 write_unlock(&act_mod_lock);
427
428 return 0;
429}
430EXPORT_SYMBOL(tcf_register_action);
431
432int tcf_unregister_action(struct tc_action_ops *act,
433 struct pernet_operations *ops)
434{
435 struct tc_action_ops *a;
436 int err = -ENOENT;
437
438 write_lock(&act_mod_lock);
439 list_for_each_entry(a, &act_base, head) {
440 if (a == act) {
441 list_del(&act->head);
442 err = 0;
443 break;
444 }
445 }
446 write_unlock(&act_mod_lock);
447 if (!err)
448 unregister_pernet_subsys(ops);
449 return err;
450}
451EXPORT_SYMBOL(tcf_unregister_action);
452
453/* lookup by name */
454static struct tc_action_ops *tc_lookup_action_n(char *kind)
455{
456 struct tc_action_ops *a, *res = NULL;
457
458 if (kind) {
459 read_lock(&act_mod_lock);
460 list_for_each_entry(a, &act_base, head) {
461 if (strcmp(kind, a->kind) == 0) {
462 if (try_module_get(a->owner))
463 res = a;
464 break;
465 }
466 }
467 read_unlock(&act_mod_lock);
468 }
469 return res;
470}
471
472/* lookup by nlattr */
473static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
474{
475 struct tc_action_ops *a, *res = NULL;
476
477 if (kind) {
478 read_lock(&act_mod_lock);
479 list_for_each_entry(a, &act_base, head) {
480 if (nla_strcmp(kind, a->kind) == 0) {
481 if (try_module_get(a->owner))
482 res = a;
483 break;
484 }
485 }
486 read_unlock(&act_mod_lock);
487 }
488 return res;
489}
490
491/*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
492#define TCA_ACT_MAX_PRIO_MASK 0x1FF
493int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
494 int nr_actions, struct tcf_result *res)
495{
496 u32 jmp_prgcnt = 0;
497 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
498 int i;
499 int ret = TC_ACT_OK;
500
501 if (skb_skip_tc_classify(skb))
502 return TC_ACT_OK;
503
504restart_act_graph:
505 for (i = 0; i < nr_actions; i++) {
506 const struct tc_action *a = actions[i];
507
508 if (jmp_prgcnt > 0) {
509 jmp_prgcnt -= 1;
510 continue;
511 }
512repeat:
513 ret = a->ops->act(skb, a, res);
514 if (ret == TC_ACT_REPEAT)
515 goto repeat; /* we need a ttl - JHS */
516
517 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
518 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
519 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
520 /* faulty opcode, stop pipeline */
521 return TC_ACT_OK;
522 } else {
523 jmp_ttl -= 1;
524 if (jmp_ttl > 0)
525 goto restart_act_graph;
526 else /* faulty graph, stop pipeline */
527 return TC_ACT_OK;
528 }
529 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
530 tcf_action_goto_chain_exec(a, res);
531 }
532
533 if (ret != TC_ACT_PIPE)
534 break;
535 }
536
537 return ret;
538}
539EXPORT_SYMBOL(tcf_action_exec);
540
541int tcf_action_destroy(struct list_head *actions, int bind)
542{
543 const struct tc_action_ops *ops;
544 struct tc_action *a, *tmp;
545 int ret = 0;
546
547 list_for_each_entry_safe(a, tmp, actions, list) {
548 ops = a->ops;
549 ret = __tcf_idr_release(a, bind, true);
550 if (ret == ACT_P_DELETED)
551 module_put(ops->owner);
552 else if (ret < 0)
553 return ret;
554 }
555 return ret;
556}
557
558int
559tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
560{
561 return a->ops->dump(skb, a, bind, ref);
562}
563
564int
565tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
566{
567 int err = -EINVAL;
568 unsigned char *b = skb_tail_pointer(skb);
569 struct nlattr *nest;
570
571 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
572 goto nla_put_failure;
573 if (tcf_action_copy_stats(skb, a, 0))
574 goto nla_put_failure;
575 if (a->act_cookie) {
576 if (nla_put(skb, TCA_ACT_COOKIE, a->act_cookie->len,
577 a->act_cookie->data))
578 goto nla_put_failure;
579 }
580
581 nest = nla_nest_start(skb, TCA_OPTIONS);
582 if (nest == NULL)
583 goto nla_put_failure;
584 err = tcf_action_dump_old(skb, a, bind, ref);
585 if (err > 0) {
586 nla_nest_end(skb, nest);
587 return err;
588 }
589
590nla_put_failure:
591 nlmsg_trim(skb, b);
592 return -1;
593}
594EXPORT_SYMBOL(tcf_action_dump_1);
595
596int tcf_action_dump(struct sk_buff *skb, struct list_head *actions,
597 int bind, int ref)
598{
599 struct tc_action *a;
600 int err = -EINVAL;
601 struct nlattr *nest;
602
603 list_for_each_entry(a, actions, list) {
604 nest = nla_nest_start(skb, a->order);
605 if (nest == NULL)
606 goto nla_put_failure;
607 err = tcf_action_dump_1(skb, a, bind, ref);
608 if (err < 0)
609 goto errout;
610 nla_nest_end(skb, nest);
611 }
612
613 return 0;
614
615nla_put_failure:
616 err = -EINVAL;
617errout:
618 nla_nest_cancel(skb, nest);
619 return err;
620}
621
622static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
623{
624 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
625 if (!c)
626 return NULL;
627
628 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
629 if (!c->data) {
630 kfree(c);
631 return NULL;
632 }
633 c->len = nla_len(tb[TCA_ACT_COOKIE]);
634
635 return c;
636}
637
638struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
639 struct nlattr *nla, struct nlattr *est,
640 char *name, int ovr, int bind,
641 struct netlink_ext_ack *extack)
642{
643 struct tc_action *a;
644 struct tc_action_ops *a_o;
645 struct tc_cookie *cookie = NULL;
646 char act_name[IFNAMSIZ];
647 struct nlattr *tb[TCA_ACT_MAX + 1];
648 struct nlattr *kind;
649 int err;
650
651 if (name == NULL) {
652 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
653 if (err < 0)
654 goto err_out;
655 err = -EINVAL;
656 kind = tb[TCA_ACT_KIND];
657 if (!kind) {
658 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
659 goto err_out;
660 }
661 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
662 NL_SET_ERR_MSG(extack, "TC action name too long");
663 goto err_out;
664 }
665 if (tb[TCA_ACT_COOKIE]) {
666 int cklen = nla_len(tb[TCA_ACT_COOKIE]);
667
668 if (cklen > TC_COOKIE_MAX_SIZE) {
669 NL_SET_ERR_MSG(extack, "TC cookie size above the maximum");
670 goto err_out;
671 }
672
673 cookie = nla_memdup_cookie(tb);
674 if (!cookie) {
675 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
676 err = -ENOMEM;
677 goto err_out;
678 }
679 }
680 } else {
681 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
682 NL_SET_ERR_MSG(extack, "TC action name too long");
683 err = -EINVAL;
684 goto err_out;
685 }
686 }
687
688 a_o = tc_lookup_action_n(act_name);
689 if (a_o == NULL) {
690#ifdef CONFIG_MODULES
691 rtnl_unlock();
692 request_module("act_%s", act_name);
693 rtnl_lock();
694
695 a_o = tc_lookup_action_n(act_name);
696
697 /* We dropped the RTNL semaphore in order to
698 * perform the module load. So, even if we
699 * succeeded in loading the module we have to
700 * tell the caller to replay the request. We
701 * indicate this using -EAGAIN.
702 */
703 if (a_o != NULL) {
704 err = -EAGAIN;
705 goto err_mod;
706 }
707#endif
708 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
709 err = -ENOENT;
710 goto err_out;
711 }
712
713 /* backward compatibility for policer */
714 if (name == NULL)
715 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
716 extack);
717 else
718 err = a_o->init(net, nla, est, &a, ovr, bind, extack);
719 if (err < 0)
720 goto err_mod;
721
722 if (name == NULL && tb[TCA_ACT_COOKIE]) {
723 if (a->act_cookie) {
724 kfree(a->act_cookie->data);
725 kfree(a->act_cookie);
726 }
727 a->act_cookie = cookie;
728 }
729
730 /* module count goes up only when brand new policy is created
731 * if it exists and is only bound to in a_o->init() then
732 * ACT_P_CREATED is not returned (a zero is).
733 */
734 if (err != ACT_P_CREATED)
735 module_put(a_o->owner);
736
737 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) {
738 err = tcf_action_goto_chain_init(a, tp);
739 if (err) {
740 LIST_HEAD(actions);
741
742 list_add_tail(&a->list, &actions);
743 tcf_action_destroy(&actions, bind);
744 NL_SET_ERR_MSG(extack, "Failed to init TC action chain");
745 return ERR_PTR(err);
746 }
747 }
748
749 return a;
750
751err_mod:
752 module_put(a_o->owner);
753err_out:
754 if (cookie) {
755 kfree(cookie->data);
756 kfree(cookie);
757 }
758 return ERR_PTR(err);
759}
760
761static void cleanup_a(struct list_head *actions, int ovr)
762{
763 struct tc_action *a;
764
765 if (!ovr)
766 return;
767
768 list_for_each_entry(a, actions, list)
769 a->tcfa_refcnt--;
770}
771
772int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
773 struct nlattr *est, char *name, int ovr, int bind,
774 struct list_head *actions, size_t *attr_size,
775 struct netlink_ext_ack *extack)
776{
777 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
778 struct tc_action *act;
779 size_t sz = 0;
780 int err;
781 int i;
782
783 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack);
784 if (err < 0)
785 return err;
786
787 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
788 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
789 extack);
790 if (IS_ERR(act)) {
791 err = PTR_ERR(act);
792 goto err;
793 }
794 act->order = i;
795 sz += tcf_action_fill_size(act);
796 if (ovr)
797 act->tcfa_refcnt++;
798 list_add_tail(&act->list, actions);
799 }
800
801 *attr_size = tcf_action_full_attrs_size(sz);
802
803 /* Remove the temp refcnt which was necessary to protect against
804 * destroying an existing action which was being replaced
805 */
806 cleanup_a(actions, ovr);
807 return 0;
808
809err:
810 tcf_action_destroy(actions, bind);
811 return err;
812}
813
814int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
815 int compat_mode)
816{
817 int err = 0;
818 struct gnet_dump d;
819
820 if (p == NULL)
821 goto errout;
822
823 /* compat_mode being true specifies a call that is supposed
824 * to add additional backward compatibility statistic TLVs.
825 */
826 if (compat_mode) {
827 if (p->type == TCA_OLD_COMPAT)
828 err = gnet_stats_start_copy_compat(skb, 0,
829 TCA_STATS,
830 TCA_XSTATS,
831 &p->tcfa_lock, &d,
832 TCA_PAD);
833 else
834 return 0;
835 } else
836 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
837 &p->tcfa_lock, &d, TCA_ACT_PAD);
838
839 if (err < 0)
840 goto errout;
841
842 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
843 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
844 gnet_stats_copy_queue(&d, p->cpu_qstats,
845 &p->tcfa_qstats,
846 p->tcfa_qstats.qlen) < 0)
847 goto errout;
848
849 if (gnet_stats_finish_copy(&d) < 0)
850 goto errout;
851
852 return 0;
853
854errout:
855 return -1;
856}
857
858static int tca_get_fill(struct sk_buff *skb, struct list_head *actions,
859 u32 portid, u32 seq, u16 flags, int event, int bind,
860 int ref)
861{
862 struct tcamsg *t;
863 struct nlmsghdr *nlh;
864 unsigned char *b = skb_tail_pointer(skb);
865 struct nlattr *nest;
866
867 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
868 if (!nlh)
869 goto out_nlmsg_trim;
870 t = nlmsg_data(nlh);
871 t->tca_family = AF_UNSPEC;
872 t->tca__pad1 = 0;
873 t->tca__pad2 = 0;
874
875 nest = nla_nest_start(skb, TCA_ACT_TAB);
876 if (!nest)
877 goto out_nlmsg_trim;
878
879 if (tcf_action_dump(skb, actions, bind, ref) < 0)
880 goto out_nlmsg_trim;
881
882 nla_nest_end(skb, nest);
883
884 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
885 return skb->len;
886
887out_nlmsg_trim:
888 nlmsg_trim(skb, b);
889 return -1;
890}
891
892static int
893tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
894 struct list_head *actions, int event,
895 struct netlink_ext_ack *extack)
896{
897 struct sk_buff *skb;
898
899 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
900 if (!skb)
901 return -ENOBUFS;
902 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
903 0, 0) <= 0) {
904 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
905 kfree_skb(skb);
906 return -EINVAL;
907 }
908
909 return rtnl_unicast(skb, net, portid);
910}
911
912static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
913 struct nlmsghdr *n, u32 portid,
914 struct netlink_ext_ack *extack)
915{
916 struct nlattr *tb[TCA_ACT_MAX + 1];
917 const struct tc_action_ops *ops;
918 struct tc_action *a;
919 int index;
920 int err;
921
922 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
923 if (err < 0)
924 goto err_out;
925
926 err = -EINVAL;
927 if (tb[TCA_ACT_INDEX] == NULL ||
928 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
929 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
930 goto err_out;
931 }
932 index = nla_get_u32(tb[TCA_ACT_INDEX]);
933
934 err = -EINVAL;
935 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
936 if (!ops) { /* could happen in batch of actions */
937 NL_SET_ERR_MSG(extack, "Specified TC action not found");
938 goto err_out;
939 }
940 err = -ENOENT;
941 if (ops->lookup(net, &a, index, extack) == 0)
942 goto err_mod;
943
944 module_put(ops->owner);
945 return a;
946
947err_mod:
948 module_put(ops->owner);
949err_out:
950 return ERR_PTR(err);
951}
952
953static int tca_action_flush(struct net *net, struct nlattr *nla,
954 struct nlmsghdr *n, u32 portid,
955 struct netlink_ext_ack *extack)
956{
957 struct sk_buff *skb;
958 unsigned char *b;
959 struct nlmsghdr *nlh;
960 struct tcamsg *t;
961 struct netlink_callback dcb;
962 struct nlattr *nest;
963 struct nlattr *tb[TCA_ACT_MAX + 1];
964 const struct tc_action_ops *ops;
965 struct nlattr *kind;
966 int err = -ENOMEM;
967
968 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
969 if (!skb)
970 return err;
971
972 b = skb_tail_pointer(skb);
973
974 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack);
975 if (err < 0)
976 goto err_out;
977
978 err = -EINVAL;
979 kind = tb[TCA_ACT_KIND];
980 ops = tc_lookup_action(kind);
981 if (!ops) { /*some idjot trying to flush unknown action */
982 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
983 goto err_out;
984 }
985
986 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
987 sizeof(*t), 0);
988 if (!nlh) {
989 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
990 goto out_module_put;
991 }
992 t = nlmsg_data(nlh);
993 t->tca_family = AF_UNSPEC;
994 t->tca__pad1 = 0;
995 t->tca__pad2 = 0;
996
997 nest = nla_nest_start(skb, TCA_ACT_TAB);
998 if (!nest) {
999 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1000 goto out_module_put;
1001 }
1002
1003 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1004 if (err <= 0) {
1005 nla_nest_cancel(skb, nest);
1006 goto out_module_put;
1007 }
1008
1009 nla_nest_end(skb, nest);
1010
1011 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1012 nlh->nlmsg_flags |= NLM_F_ROOT;
1013 module_put(ops->owner);
1014 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1015 n->nlmsg_flags & NLM_F_ECHO);
1016 if (err > 0)
1017 return 0;
1018 if (err < 0)
1019 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1020
1021 return err;
1022
1023out_module_put:
1024 module_put(ops->owner);
1025err_out:
1026 kfree_skb(skb);
1027 return err;
1028}
1029
1030static int
1031tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
1032 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1033{
1034 int ret;
1035 struct sk_buff *skb;
1036
1037 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1038 GFP_KERNEL);
1039 if (!skb)
1040 return -ENOBUFS;
1041
1042 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1043 0, 1) <= 0) {
1044 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1045 kfree_skb(skb);
1046 return -EINVAL;
1047 }
1048
1049 /* now do the delete */
1050 ret = tcf_action_destroy(actions, 0);
1051 if (ret < 0) {
1052 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1053 kfree_skb(skb);
1054 return ret;
1055 }
1056
1057 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1058 n->nlmsg_flags & NLM_F_ECHO);
1059 if (ret > 0)
1060 return 0;
1061 return ret;
1062}
1063
1064static int
1065tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1066 u32 portid, int event, struct netlink_ext_ack *extack)
1067{
1068 int i, ret;
1069 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1070 struct tc_action *act;
1071 size_t attr_size = 0;
1072 LIST_HEAD(actions);
1073
1074 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack);
1075 if (ret < 0)
1076 return ret;
1077
1078 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1079 if (tb[1])
1080 return tca_action_flush(net, tb[1], n, portid, extack);
1081
1082 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1083 return -EINVAL;
1084 }
1085
1086 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1087 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1088 if (IS_ERR(act)) {
1089 ret = PTR_ERR(act);
1090 goto err;
1091 }
1092 act->order = i;
1093 attr_size += tcf_action_fill_size(act);
1094 list_add_tail(&act->list, &actions);
1095 }
1096
1097 attr_size = tcf_action_full_attrs_size(attr_size);
1098
1099 if (event == RTM_GETACTION)
1100 ret = tcf_get_notify(net, portid, n, &actions, event, extack);
1101 else { /* delete */
1102 ret = tcf_del_notify(net, n, &actions, portid, attr_size, extack);
1103 if (ret)
1104 goto err;
1105 return ret;
1106 }
1107err:
1108 if (event != RTM_GETACTION)
1109 tcf_action_destroy(&actions, 0);
1110 return ret;
1111}
1112
1113static int
1114tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
1115 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1116{
1117 struct sk_buff *skb;
1118 int err = 0;
1119
1120 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1121 GFP_KERNEL);
1122 if (!skb)
1123 return -ENOBUFS;
1124
1125 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1126 RTM_NEWACTION, 0, 0) <= 0) {
1127 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1128 kfree_skb(skb);
1129 return -EINVAL;
1130 }
1131
1132 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1133 n->nlmsg_flags & NLM_F_ECHO);
1134 if (err > 0)
1135 err = 0;
1136 return err;
1137}
1138
1139static int tcf_action_add(struct net *net, struct nlattr *nla,
1140 struct nlmsghdr *n, u32 portid, int ovr,
1141 struct netlink_ext_ack *extack)
1142{
1143 size_t attr_size = 0;
1144 int ret = 0;
1145 LIST_HEAD(actions);
1146
1147 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, &actions,
1148 &attr_size, extack);
1149 if (ret)
1150 return ret;
1151
1152 return tcf_add_notify(net, n, &actions, portid, attr_size, extack);
1153}
1154
1155static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1156static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1157 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1158 .validation_data = &tcaa_root_flags_allowed },
1159 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1160};
1161
1162static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1163 struct netlink_ext_ack *extack)
1164{
1165 struct net *net = sock_net(skb->sk);
1166 struct nlattr *tca[TCA_ROOT_MAX + 1];
1167 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1168 int ret = 0, ovr = 0;
1169
1170 if ((n->nlmsg_type != RTM_GETACTION) &&
1171 !netlink_capable(skb, CAP_NET_ADMIN))
1172 return -EPERM;
1173
1174 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ROOT_MAX, NULL,
1175 extack);
1176 if (ret < 0)
1177 return ret;
1178
1179 if (tca[TCA_ACT_TAB] == NULL) {
1180 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1181 return -EINVAL;
1182 }
1183
1184 /* n->nlmsg_flags & NLM_F_CREATE */
1185 switch (n->nlmsg_type) {
1186 case RTM_NEWACTION:
1187 /* we are going to assume all other flags
1188 * imply create only if it doesn't exist
1189 * Note that CREATE | EXCL implies that
1190 * but since we want avoid ambiguity (eg when flags
1191 * is zero) then just set this
1192 */
1193 if (n->nlmsg_flags & NLM_F_REPLACE)
1194 ovr = 1;
1195replay:
1196 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1197 extack);
1198 if (ret == -EAGAIN)
1199 goto replay;
1200 break;
1201 case RTM_DELACTION:
1202 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1203 portid, RTM_DELACTION, extack);
1204 break;
1205 case RTM_GETACTION:
1206 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1207 portid, RTM_GETACTION, extack);
1208 break;
1209 default:
1210 BUG();
1211 }
1212
1213 return ret;
1214}
1215
1216static struct nlattr *find_dump_kind(struct nlattr **nla)
1217{
1218 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1219 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1220 struct nlattr *kind;
1221
1222 tb1 = nla[TCA_ACT_TAB];
1223 if (tb1 == NULL)
1224 return NULL;
1225
1226 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1227 NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1228 return NULL;
1229
1230 if (tb[1] == NULL)
1231 return NULL;
1232 if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
1233 return NULL;
1234 kind = tb2[TCA_ACT_KIND];
1235
1236 return kind;
1237}
1238
1239static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1240{
1241 struct net *net = sock_net(skb->sk);
1242 struct nlmsghdr *nlh;
1243 unsigned char *b = skb_tail_pointer(skb);
1244 struct nlattr *nest;
1245 struct tc_action_ops *a_o;
1246 int ret = 0;
1247 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1248 struct nlattr *tb[TCA_ROOT_MAX + 1];
1249 struct nlattr *count_attr = NULL;
1250 unsigned long jiffy_since = 0;
1251 struct nlattr *kind = NULL;
1252 struct nla_bitfield32 bf;
1253 u32 msecs_since = 0;
1254 u32 act_count = 0;
1255
1256 ret = nlmsg_parse(cb->nlh, sizeof(struct tcamsg), tb, TCA_ROOT_MAX,
1257 tcaa_policy, NULL);
1258 if (ret < 0)
1259 return ret;
1260
1261 kind = find_dump_kind(tb);
1262 if (kind == NULL) {
1263 pr_info("tc_dump_action: action bad kind\n");
1264 return 0;
1265 }
1266
1267 a_o = tc_lookup_action(kind);
1268 if (a_o == NULL)
1269 return 0;
1270
1271 cb->args[2] = 0;
1272 if (tb[TCA_ROOT_FLAGS]) {
1273 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1274 cb->args[2] = bf.value;
1275 }
1276
1277 if (tb[TCA_ROOT_TIME_DELTA]) {
1278 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1279 }
1280
1281 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1282 cb->nlh->nlmsg_type, sizeof(*t), 0);
1283 if (!nlh)
1284 goto out_module_put;
1285
1286 if (msecs_since)
1287 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1288
1289 t = nlmsg_data(nlh);
1290 t->tca_family = AF_UNSPEC;
1291 t->tca__pad1 = 0;
1292 t->tca__pad2 = 0;
1293 cb->args[3] = jiffy_since;
1294 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1295 if (!count_attr)
1296 goto out_module_put;
1297
1298 nest = nla_nest_start(skb, TCA_ACT_TAB);
1299 if (nest == NULL)
1300 goto out_module_put;
1301
1302 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1303 if (ret < 0)
1304 goto out_module_put;
1305
1306 if (ret > 0) {
1307 nla_nest_end(skb, nest);
1308 ret = skb->len;
1309 act_count = cb->args[1];
1310 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1311 cb->args[1] = 0;
1312 } else
1313 nlmsg_trim(skb, b);
1314
1315 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1316 if (NETLINK_CB(cb->skb).portid && ret)
1317 nlh->nlmsg_flags |= NLM_F_MULTI;
1318 module_put(a_o->owner);
1319 return skb->len;
1320
1321out_module_put:
1322 module_put(a_o->owner);
1323 nlmsg_trim(skb, b);
1324 return skb->len;
1325}
1326
1327struct tcf_action_net {
1328 struct rhashtable egdev_ht;
1329};
1330
1331static unsigned int tcf_action_net_id;
1332
1333struct tcf_action_egdev_cb {
1334 struct list_head list;
1335 tc_setup_cb_t *cb;
1336 void *cb_priv;
1337};
1338
1339struct tcf_action_egdev {
1340 struct rhash_head ht_node;
1341 const struct net_device *dev;
1342 unsigned int refcnt;
1343 struct list_head cb_list;
1344};
1345
1346static const struct rhashtable_params tcf_action_egdev_ht_params = {
1347 .key_offset = offsetof(struct tcf_action_egdev, dev),
1348 .head_offset = offsetof(struct tcf_action_egdev, ht_node),
1349 .key_len = sizeof(const struct net_device *),
1350};
1351
1352static struct tcf_action_egdev *
1353tcf_action_egdev_lookup(const struct net_device *dev)
1354{
1355 struct net *net = dev_net(dev);
1356 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1357
1358 return rhashtable_lookup_fast(&tan->egdev_ht, &dev,
1359 tcf_action_egdev_ht_params);
1360}
1361
1362static struct tcf_action_egdev *
1363tcf_action_egdev_get(const struct net_device *dev)
1364{
1365 struct tcf_action_egdev *egdev;
1366 struct tcf_action_net *tan;
1367
1368 egdev = tcf_action_egdev_lookup(dev);
1369 if (egdev)
1370 goto inc_ref;
1371
1372 egdev = kzalloc(sizeof(*egdev), GFP_KERNEL);
1373 if (!egdev)
1374 return NULL;
1375 INIT_LIST_HEAD(&egdev->cb_list);
1376 egdev->dev = dev;
1377 tan = net_generic(dev_net(dev), tcf_action_net_id);
1378 rhashtable_insert_fast(&tan->egdev_ht, &egdev->ht_node,
1379 tcf_action_egdev_ht_params);
1380
1381inc_ref:
1382 egdev->refcnt++;
1383 return egdev;
1384}
1385
1386static void tcf_action_egdev_put(struct tcf_action_egdev *egdev)
1387{
1388 struct tcf_action_net *tan;
1389
1390 if (--egdev->refcnt)
1391 return;
1392 tan = net_generic(dev_net(egdev->dev), tcf_action_net_id);
1393 rhashtable_remove_fast(&tan->egdev_ht, &egdev->ht_node,
1394 tcf_action_egdev_ht_params);
1395 kfree(egdev);
1396}
1397
1398static struct tcf_action_egdev_cb *
1399tcf_action_egdev_cb_lookup(struct tcf_action_egdev *egdev,
1400 tc_setup_cb_t *cb, void *cb_priv)
1401{
1402 struct tcf_action_egdev_cb *egdev_cb;
1403
1404 list_for_each_entry(egdev_cb, &egdev->cb_list, list)
1405 if (egdev_cb->cb == cb && egdev_cb->cb_priv == cb_priv)
1406 return egdev_cb;
1407 return NULL;
1408}
1409
1410static int tcf_action_egdev_cb_call(struct tcf_action_egdev *egdev,
1411 enum tc_setup_type type,
1412 void *type_data, bool err_stop)
1413{
1414 struct tcf_action_egdev_cb *egdev_cb;
1415 int ok_count = 0;
1416 int err;
1417
1418 list_for_each_entry(egdev_cb, &egdev->cb_list, list) {
1419 err = egdev_cb->cb(type, type_data, egdev_cb->cb_priv);
1420 if (err) {
1421 if (err_stop)
1422 return err;
1423 } else {
1424 ok_count++;
1425 }
1426 }
1427 return ok_count;
1428}
1429
1430static int tcf_action_egdev_cb_add(struct tcf_action_egdev *egdev,
1431 tc_setup_cb_t *cb, void *cb_priv)
1432{
1433 struct tcf_action_egdev_cb *egdev_cb;
1434
1435 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1436 if (WARN_ON(egdev_cb))
1437 return -EEXIST;
1438 egdev_cb = kzalloc(sizeof(*egdev_cb), GFP_KERNEL);
1439 if (!egdev_cb)
1440 return -ENOMEM;
1441 egdev_cb->cb = cb;
1442 egdev_cb->cb_priv = cb_priv;
1443 list_add(&egdev_cb->list, &egdev->cb_list);
1444 return 0;
1445}
1446
1447static void tcf_action_egdev_cb_del(struct tcf_action_egdev *egdev,
1448 tc_setup_cb_t *cb, void *cb_priv)
1449{
1450 struct tcf_action_egdev_cb *egdev_cb;
1451
1452 egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv);
1453 if (WARN_ON(!egdev_cb))
1454 return;
1455 list_del(&egdev_cb->list);
1456 kfree(egdev_cb);
1457}
1458
1459static int __tc_setup_cb_egdev_register(const struct net_device *dev,
1460 tc_setup_cb_t *cb, void *cb_priv)
1461{
1462 struct tcf_action_egdev *egdev = tcf_action_egdev_get(dev);
1463 int err;
1464
1465 if (!egdev)
1466 return -ENOMEM;
1467 err = tcf_action_egdev_cb_add(egdev, cb, cb_priv);
1468 if (err)
1469 goto err_cb_add;
1470 return 0;
1471
1472err_cb_add:
1473 tcf_action_egdev_put(egdev);
1474 return err;
1475}
1476int tc_setup_cb_egdev_register(const struct net_device *dev,
1477 tc_setup_cb_t *cb, void *cb_priv)
1478{
1479 int err;
1480
1481 rtnl_lock();
1482 err = __tc_setup_cb_egdev_register(dev, cb, cb_priv);
1483 rtnl_unlock();
1484 return err;
1485}
1486EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_register);
1487
1488static void __tc_setup_cb_egdev_unregister(const struct net_device *dev,
1489 tc_setup_cb_t *cb, void *cb_priv)
1490{
1491 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1492
1493 if (WARN_ON(!egdev))
1494 return;
1495 tcf_action_egdev_cb_del(egdev, cb, cb_priv);
1496 tcf_action_egdev_put(egdev);
1497}
1498void tc_setup_cb_egdev_unregister(const struct net_device *dev,
1499 tc_setup_cb_t *cb, void *cb_priv)
1500{
1501 rtnl_lock();
1502 __tc_setup_cb_egdev_unregister(dev, cb, cb_priv);
1503 rtnl_unlock();
1504}
1505EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_unregister);
1506
1507int tc_setup_cb_egdev_call(const struct net_device *dev,
1508 enum tc_setup_type type, void *type_data,
1509 bool err_stop)
1510{
1511 struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev);
1512
1513 if (!egdev)
1514 return 0;
1515 return tcf_action_egdev_cb_call(egdev, type, type_data, err_stop);
1516}
1517EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_call);
1518
1519static __net_init int tcf_action_net_init(struct net *net)
1520{
1521 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1522
1523 return rhashtable_init(&tan->egdev_ht, &tcf_action_egdev_ht_params);
1524}
1525
1526static void __net_exit tcf_action_net_exit(struct net *net)
1527{
1528 struct tcf_action_net *tan = net_generic(net, tcf_action_net_id);
1529
1530 rhashtable_destroy(&tan->egdev_ht);
1531}
1532
1533static struct pernet_operations tcf_action_net_ops = {
1534 .init = tcf_action_net_init,
1535 .exit = tcf_action_net_exit,
1536 .id = &tcf_action_net_id,
1537 .size = sizeof(struct tcf_action_net),
1538};
1539
1540static int __init tc_action_init(void)
1541{
1542 int err;
1543
1544 err = register_pernet_subsys(&tcf_action_net_ops);
1545 if (err)
1546 return err;
1547
1548 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1549 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1550 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1551 0);
1552
1553 return 0;
1554}
1555
1556subsys_initcall(tc_action_init);