Loading...
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 <net/net_namespace.h>
25#include <net/sock.h>
26#include <net/sch_generic.h>
27#include <net/act_api.h>
28#include <net/netlink.h>
29
30void tcf_hash_destroy(struct tc_action *a)
31{
32 struct tcf_common *p = a->priv;
33 struct tcf_hashinfo *hinfo = a->ops->hinfo;
34
35 spin_lock_bh(&hinfo->lock);
36 hlist_del(&p->tcfc_head);
37 spin_unlock_bh(&hinfo->lock);
38 gen_kill_estimator(&p->tcfc_bstats,
39 &p->tcfc_rate_est);
40 /*
41 * gen_estimator est_timer() might access p->tcfc_lock
42 * or bstats, wait a RCU grace period before freeing p
43 */
44 kfree_rcu(p, tcfc_rcu);
45}
46EXPORT_SYMBOL(tcf_hash_destroy);
47
48int tcf_hash_release(struct tc_action *a, int bind)
49{
50 struct tcf_common *p = a->priv;
51 int ret = 0;
52
53 if (p) {
54 if (bind)
55 p->tcfc_bindcnt--;
56 else if (p->tcfc_bindcnt > 0)
57 return -EPERM;
58
59 p->tcfc_refcnt--;
60 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
61 if (a->ops->cleanup)
62 a->ops->cleanup(a, bind);
63 tcf_hash_destroy(a);
64 ret = 1;
65 }
66 }
67 return ret;
68}
69EXPORT_SYMBOL(tcf_hash_release);
70
71static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
72 struct tc_action *a)
73{
74 struct tcf_hashinfo *hinfo = a->ops->hinfo;
75 struct hlist_head *head;
76 struct tcf_common *p;
77 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
78 struct nlattr *nest;
79
80 spin_lock_bh(&hinfo->lock);
81
82 s_i = cb->args[0];
83
84 for (i = 0; i < (hinfo->hmask + 1); i++) {
85 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
86
87 hlist_for_each_entry_rcu(p, head, tcfc_head) {
88 index++;
89 if (index < s_i)
90 continue;
91 a->priv = p;
92 a->order = n_i;
93
94 nest = nla_nest_start(skb, a->order);
95 if (nest == NULL)
96 goto nla_put_failure;
97 err = tcf_action_dump_1(skb, a, 0, 0);
98 if (err < 0) {
99 index--;
100 nlmsg_trim(skb, nest);
101 goto done;
102 }
103 nla_nest_end(skb, nest);
104 n_i++;
105 if (n_i >= TCA_ACT_MAX_PRIO)
106 goto done;
107 }
108 }
109done:
110 spin_unlock_bh(&hinfo->lock);
111 if (n_i)
112 cb->args[0] += n_i;
113 return n_i;
114
115nla_put_failure:
116 nla_nest_cancel(skb, nest);
117 goto done;
118}
119
120static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a)
121{
122 struct tcf_hashinfo *hinfo = a->ops->hinfo;
123 struct hlist_head *head;
124 struct hlist_node *n;
125 struct tcf_common *p;
126 struct nlattr *nest;
127 int i = 0, n_i = 0;
128 int ret = -EINVAL;
129
130 nest = nla_nest_start(skb, a->order);
131 if (nest == NULL)
132 goto nla_put_failure;
133 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
134 goto nla_put_failure;
135 for (i = 0; i < (hinfo->hmask + 1); i++) {
136 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
137 hlist_for_each_entry_safe(p, n, head, tcfc_head) {
138 a->priv = p;
139 ret = tcf_hash_release(a, 0);
140 if (ret == ACT_P_DELETED) {
141 module_put(a->ops->owner);
142 n_i++;
143 } else if (ret < 0)
144 goto nla_put_failure;
145 }
146 }
147 if (nla_put_u32(skb, TCA_FCNT, n_i))
148 goto nla_put_failure;
149 nla_nest_end(skb, nest);
150
151 return n_i;
152nla_put_failure:
153 nla_nest_cancel(skb, nest);
154 return ret;
155}
156
157static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
158 int type, struct tc_action *a)
159{
160 if (type == RTM_DELACTION) {
161 return tcf_del_walker(skb, a);
162 } else if (type == RTM_GETACTION) {
163 return tcf_dump_walker(skb, cb, a);
164 } else {
165 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
166 return -EINVAL;
167 }
168}
169
170static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
171{
172 struct tcf_common *p = NULL;
173 struct hlist_head *head;
174
175 spin_lock_bh(&hinfo->lock);
176 head = &hinfo->htab[tcf_hash(index, hinfo->hmask)];
177 hlist_for_each_entry_rcu(p, head, tcfc_head)
178 if (p->tcfc_index == index)
179 break;
180 spin_unlock_bh(&hinfo->lock);
181
182 return p;
183}
184
185u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo)
186{
187 u32 val = hinfo->index;
188
189 do {
190 if (++val == 0)
191 val = 1;
192 } while (tcf_hash_lookup(val, hinfo));
193
194 hinfo->index = val;
195 return val;
196}
197EXPORT_SYMBOL(tcf_hash_new_index);
198
199int tcf_hash_search(struct tc_action *a, u32 index)
200{
201 struct tcf_hashinfo *hinfo = a->ops->hinfo;
202 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
203
204 if (p) {
205 a->priv = p;
206 return 1;
207 }
208 return 0;
209}
210EXPORT_SYMBOL(tcf_hash_search);
211
212int tcf_hash_check(u32 index, struct tc_action *a, int bind)
213{
214 struct tcf_hashinfo *hinfo = a->ops->hinfo;
215 struct tcf_common *p = NULL;
216 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
217 if (bind)
218 p->tcfc_bindcnt++;
219 p->tcfc_refcnt++;
220 a->priv = p;
221 return 1;
222 }
223 return 0;
224}
225EXPORT_SYMBOL(tcf_hash_check);
226
227void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est)
228{
229 struct tcf_common *pc = a->priv;
230 if (est)
231 gen_kill_estimator(&pc->tcfc_bstats,
232 &pc->tcfc_rate_est);
233 kfree_rcu(pc, tcfc_rcu);
234}
235EXPORT_SYMBOL(tcf_hash_cleanup);
236
237int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a,
238 int size, int bind)
239{
240 struct tcf_hashinfo *hinfo = a->ops->hinfo;
241 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
242
243 if (unlikely(!p))
244 return -ENOMEM;
245 p->tcfc_refcnt = 1;
246 if (bind)
247 p->tcfc_bindcnt = 1;
248
249 spin_lock_init(&p->tcfc_lock);
250 INIT_HLIST_NODE(&p->tcfc_head);
251 p->tcfc_index = index ? index : tcf_hash_new_index(hinfo);
252 p->tcfc_tm.install = jiffies;
253 p->tcfc_tm.lastuse = jiffies;
254 if (est) {
255 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
256 &p->tcfc_lock, est);
257 if (err) {
258 kfree(p);
259 return err;
260 }
261 }
262
263 a->priv = (void *) p;
264 return 0;
265}
266EXPORT_SYMBOL(tcf_hash_create);
267
268void tcf_hash_insert(struct tc_action *a)
269{
270 struct tcf_common *p = a->priv;
271 struct tcf_hashinfo *hinfo = a->ops->hinfo;
272 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
273
274 spin_lock_bh(&hinfo->lock);
275 hlist_add_head(&p->tcfc_head, &hinfo->htab[h]);
276 spin_unlock_bh(&hinfo->lock);
277}
278EXPORT_SYMBOL(tcf_hash_insert);
279
280static LIST_HEAD(act_base);
281static DEFINE_RWLOCK(act_mod_lock);
282
283int tcf_register_action(struct tc_action_ops *act, unsigned int mask)
284{
285 struct tc_action_ops *a;
286 int err;
287
288 /* Must supply act, dump and init */
289 if (!act->act || !act->dump || !act->init)
290 return -EINVAL;
291
292 /* Supply defaults */
293 if (!act->lookup)
294 act->lookup = tcf_hash_search;
295 if (!act->walk)
296 act->walk = tcf_generic_walker;
297
298 act->hinfo = kmalloc(sizeof(struct tcf_hashinfo), GFP_KERNEL);
299 if (!act->hinfo)
300 return -ENOMEM;
301 err = tcf_hashinfo_init(act->hinfo, mask);
302 if (err) {
303 kfree(act->hinfo);
304 return err;
305 }
306
307 write_lock(&act_mod_lock);
308 list_for_each_entry(a, &act_base, head) {
309 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
310 write_unlock(&act_mod_lock);
311 tcf_hashinfo_destroy(act->hinfo);
312 kfree(act->hinfo);
313 return -EEXIST;
314 }
315 }
316 list_add_tail(&act->head, &act_base);
317 write_unlock(&act_mod_lock);
318 return 0;
319}
320EXPORT_SYMBOL(tcf_register_action);
321
322int tcf_unregister_action(struct tc_action_ops *act)
323{
324 struct tc_action_ops *a;
325 int err = -ENOENT;
326
327 write_lock(&act_mod_lock);
328 list_for_each_entry(a, &act_base, head) {
329 if (a == act) {
330 list_del(&act->head);
331 tcf_hashinfo_destroy(act->hinfo);
332 kfree(act->hinfo);
333 err = 0;
334 break;
335 }
336 }
337 write_unlock(&act_mod_lock);
338 return err;
339}
340EXPORT_SYMBOL(tcf_unregister_action);
341
342/* lookup by name */
343static struct tc_action_ops *tc_lookup_action_n(char *kind)
344{
345 struct tc_action_ops *a, *res = NULL;
346
347 if (kind) {
348 read_lock(&act_mod_lock);
349 list_for_each_entry(a, &act_base, head) {
350 if (strcmp(kind, a->kind) == 0) {
351 if (try_module_get(a->owner))
352 res = a;
353 break;
354 }
355 }
356 read_unlock(&act_mod_lock);
357 }
358 return res;
359}
360
361/* lookup by nlattr */
362static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
363{
364 struct tc_action_ops *a, *res = NULL;
365
366 if (kind) {
367 read_lock(&act_mod_lock);
368 list_for_each_entry(a, &act_base, head) {
369 if (nla_strcmp(kind, a->kind) == 0) {
370 if (try_module_get(a->owner))
371 res = a;
372 break;
373 }
374 }
375 read_unlock(&act_mod_lock);
376 }
377 return res;
378}
379
380int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
381 struct tcf_result *res)
382{
383 const struct tc_action *a;
384 int ret = -1;
385
386 if (skb->tc_verd & TC_NCLS) {
387 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
388 ret = TC_ACT_OK;
389 goto exec_done;
390 }
391 list_for_each_entry(a, actions, list) {
392repeat:
393 ret = a->ops->act(skb, a, res);
394 if (TC_MUNGED & skb->tc_verd) {
395 /* copied already, allow trampling */
396 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
397 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
398 }
399 if (ret == TC_ACT_REPEAT)
400 goto repeat; /* we need a ttl - JHS */
401 if (ret != TC_ACT_PIPE)
402 goto exec_done;
403 }
404exec_done:
405 return ret;
406}
407EXPORT_SYMBOL(tcf_action_exec);
408
409int tcf_action_destroy(struct list_head *actions, int bind)
410{
411 struct tc_action *a, *tmp;
412 int ret = 0;
413
414 list_for_each_entry_safe(a, tmp, actions, list) {
415 ret = tcf_hash_release(a, bind);
416 if (ret == ACT_P_DELETED)
417 module_put(a->ops->owner);
418 else if (ret < 0)
419 return ret;
420 list_del(&a->list);
421 kfree(a);
422 }
423 return ret;
424}
425
426int
427tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
428{
429 return a->ops->dump(skb, a, bind, ref);
430}
431
432int
433tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
434{
435 int err = -EINVAL;
436 unsigned char *b = skb_tail_pointer(skb);
437 struct nlattr *nest;
438
439 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
440 goto nla_put_failure;
441 if (tcf_action_copy_stats(skb, a, 0))
442 goto nla_put_failure;
443 nest = nla_nest_start(skb, TCA_OPTIONS);
444 if (nest == NULL)
445 goto nla_put_failure;
446 err = tcf_action_dump_old(skb, a, bind, ref);
447 if (err > 0) {
448 nla_nest_end(skb, nest);
449 return err;
450 }
451
452nla_put_failure:
453 nlmsg_trim(skb, b);
454 return -1;
455}
456EXPORT_SYMBOL(tcf_action_dump_1);
457
458int
459tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref)
460{
461 struct tc_action *a;
462 int err = -EINVAL;
463 struct nlattr *nest;
464
465 list_for_each_entry(a, actions, list) {
466 nest = nla_nest_start(skb, a->order);
467 if (nest == NULL)
468 goto nla_put_failure;
469 err = tcf_action_dump_1(skb, a, bind, ref);
470 if (err < 0)
471 goto errout;
472 nla_nest_end(skb, nest);
473 }
474
475 return 0;
476
477nla_put_failure:
478 err = -EINVAL;
479errout:
480 nla_nest_cancel(skb, nest);
481 return err;
482}
483
484struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
485 struct nlattr *est, char *name, int ovr,
486 int bind)
487{
488 struct tc_action *a;
489 struct tc_action_ops *a_o;
490 char act_name[IFNAMSIZ];
491 struct nlattr *tb[TCA_ACT_MAX + 1];
492 struct nlattr *kind;
493 int err;
494
495 if (name == NULL) {
496 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
497 if (err < 0)
498 goto err_out;
499 err = -EINVAL;
500 kind = tb[TCA_ACT_KIND];
501 if (kind == NULL)
502 goto err_out;
503 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
504 goto err_out;
505 } else {
506 err = -EINVAL;
507 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
508 goto err_out;
509 }
510
511 a_o = tc_lookup_action_n(act_name);
512 if (a_o == NULL) {
513#ifdef CONFIG_MODULES
514 rtnl_unlock();
515 request_module("act_%s", act_name);
516 rtnl_lock();
517
518 a_o = tc_lookup_action_n(act_name);
519
520 /* We dropped the RTNL semaphore in order to
521 * perform the module load. So, even if we
522 * succeeded in loading the module we have to
523 * tell the caller to replay the request. We
524 * indicate this using -EAGAIN.
525 */
526 if (a_o != NULL) {
527 err = -EAGAIN;
528 goto err_mod;
529 }
530#endif
531 err = -ENOENT;
532 goto err_out;
533 }
534
535 err = -ENOMEM;
536 a = kzalloc(sizeof(*a), GFP_KERNEL);
537 if (a == NULL)
538 goto err_mod;
539
540 a->ops = a_o;
541 INIT_LIST_HEAD(&a->list);
542 /* backward compatibility for policer */
543 if (name == NULL)
544 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
545 else
546 err = a_o->init(net, nla, est, a, ovr, bind);
547 if (err < 0)
548 goto err_free;
549
550 /* module count goes up only when brand new policy is created
551 * if it exists and is only bound to in a_o->init() then
552 * ACT_P_CREATED is not returned (a zero is).
553 */
554 if (err != ACT_P_CREATED)
555 module_put(a_o->owner);
556
557 return a;
558
559err_free:
560 kfree(a);
561err_mod:
562 module_put(a_o->owner);
563err_out:
564 return ERR_PTR(err);
565}
566
567int tcf_action_init(struct net *net, struct nlattr *nla,
568 struct nlattr *est, char *name, int ovr,
569 int bind, struct list_head *actions)
570{
571 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
572 struct tc_action *act;
573 int err;
574 int i;
575
576 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
577 if (err < 0)
578 return err;
579
580 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
581 act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
582 if (IS_ERR(act)) {
583 err = PTR_ERR(act);
584 goto err;
585 }
586 act->order = i;
587 list_add_tail(&act->list, actions);
588 }
589 return 0;
590
591err:
592 tcf_action_destroy(actions, bind);
593 return err;
594}
595
596int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
597 int compat_mode)
598{
599 int err = 0;
600 struct gnet_dump d;
601 struct tcf_common *p = a->priv;
602
603 if (p == NULL)
604 goto errout;
605
606 /* compat_mode being true specifies a call that is supposed
607 * to add additional backward compatibility statistic TLVs.
608 */
609 if (compat_mode) {
610 if (a->type == TCA_OLD_COMPAT)
611 err = gnet_stats_start_copy_compat(skb, 0,
612 TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d);
613 else
614 return 0;
615 } else
616 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
617 &p->tcfc_lock, &d);
618
619 if (err < 0)
620 goto errout;
621
622 if (gnet_stats_copy_basic(&d, &p->tcfc_bstats) < 0 ||
623 gnet_stats_copy_rate_est(&d, &p->tcfc_bstats,
624 &p->tcfc_rate_est) < 0 ||
625 gnet_stats_copy_queue(&d, &p->tcfc_qstats) < 0)
626 goto errout;
627
628 if (gnet_stats_finish_copy(&d) < 0)
629 goto errout;
630
631 return 0;
632
633errout:
634 return -1;
635}
636
637static int
638tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq,
639 u16 flags, int event, int bind, int ref)
640{
641 struct tcamsg *t;
642 struct nlmsghdr *nlh;
643 unsigned char *b = skb_tail_pointer(skb);
644 struct nlattr *nest;
645
646 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
647 if (!nlh)
648 goto out_nlmsg_trim;
649 t = nlmsg_data(nlh);
650 t->tca_family = AF_UNSPEC;
651 t->tca__pad1 = 0;
652 t->tca__pad2 = 0;
653
654 nest = nla_nest_start(skb, TCA_ACT_TAB);
655 if (nest == NULL)
656 goto out_nlmsg_trim;
657
658 if (tcf_action_dump(skb, actions, bind, ref) < 0)
659 goto out_nlmsg_trim;
660
661 nla_nest_end(skb, nest);
662
663 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
664 return skb->len;
665
666out_nlmsg_trim:
667 nlmsg_trim(skb, b);
668 return -1;
669}
670
671static int
672act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
673 struct list_head *actions, int event)
674{
675 struct sk_buff *skb;
676
677 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
678 if (!skb)
679 return -ENOBUFS;
680 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
681 kfree_skb(skb);
682 return -EINVAL;
683 }
684
685 return rtnl_unicast(skb, net, portid);
686}
687
688static struct tc_action *create_a(int i)
689{
690 struct tc_action *act;
691
692 act = kzalloc(sizeof(*act), GFP_KERNEL);
693 if (act == NULL) {
694 pr_debug("create_a: failed to alloc!\n");
695 return NULL;
696 }
697 act->order = i;
698 INIT_LIST_HEAD(&act->list);
699 return act;
700}
701
702static struct tc_action *
703tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid)
704{
705 struct nlattr *tb[TCA_ACT_MAX + 1];
706 struct tc_action *a;
707 int index;
708 int err;
709
710 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
711 if (err < 0)
712 goto err_out;
713
714 err = -EINVAL;
715 if (tb[TCA_ACT_INDEX] == NULL ||
716 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
717 goto err_out;
718 index = nla_get_u32(tb[TCA_ACT_INDEX]);
719
720 err = -ENOMEM;
721 a = create_a(0);
722 if (a == NULL)
723 goto err_out;
724
725 err = -EINVAL;
726 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
727 if (a->ops == NULL) /* could happen in batch of actions */
728 goto err_free;
729 err = -ENOENT;
730 if (a->ops->lookup(a, index) == 0)
731 goto err_mod;
732
733 module_put(a->ops->owner);
734 return a;
735
736err_mod:
737 module_put(a->ops->owner);
738err_free:
739 kfree(a);
740err_out:
741 return ERR_PTR(err);
742}
743
744static void cleanup_a(struct list_head *actions)
745{
746 struct tc_action *a, *tmp;
747
748 list_for_each_entry_safe(a, tmp, actions, list) {
749 list_del(&a->list);
750 kfree(a);
751 }
752}
753
754static int tca_action_flush(struct net *net, struct nlattr *nla,
755 struct nlmsghdr *n, u32 portid)
756{
757 struct sk_buff *skb;
758 unsigned char *b;
759 struct nlmsghdr *nlh;
760 struct tcamsg *t;
761 struct netlink_callback dcb;
762 struct nlattr *nest;
763 struct nlattr *tb[TCA_ACT_MAX + 1];
764 struct nlattr *kind;
765 struct tc_action a;
766 int err = -ENOMEM;
767
768 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
769 if (!skb) {
770 pr_debug("tca_action_flush: failed skb alloc\n");
771 return err;
772 }
773
774 b = skb_tail_pointer(skb);
775
776 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
777 if (err < 0)
778 goto err_out;
779
780 err = -EINVAL;
781 kind = tb[TCA_ACT_KIND];
782 memset(&a, 0, sizeof(struct tc_action));
783 INIT_LIST_HEAD(&a.list);
784 a.ops = tc_lookup_action(kind);
785 if (a.ops == NULL) /*some idjot trying to flush unknown action */
786 goto err_out;
787
788 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0);
789 if (!nlh)
790 goto out_module_put;
791 t = nlmsg_data(nlh);
792 t->tca_family = AF_UNSPEC;
793 t->tca__pad1 = 0;
794 t->tca__pad2 = 0;
795
796 nest = nla_nest_start(skb, TCA_ACT_TAB);
797 if (nest == NULL)
798 goto out_module_put;
799
800 err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a);
801 if (err < 0)
802 goto out_module_put;
803 if (err == 0)
804 goto noflush_out;
805
806 nla_nest_end(skb, nest);
807
808 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
809 nlh->nlmsg_flags |= NLM_F_ROOT;
810 module_put(a.ops->owner);
811 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
812 n->nlmsg_flags & NLM_F_ECHO);
813 if (err > 0)
814 return 0;
815
816 return err;
817
818out_module_put:
819 module_put(a.ops->owner);
820err_out:
821noflush_out:
822 kfree_skb(skb);
823 return err;
824}
825
826static int
827tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
828 u32 portid)
829{
830 int ret;
831 struct sk_buff *skb;
832
833 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
834 if (!skb)
835 return -ENOBUFS;
836
837 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
838 0, 1) <= 0) {
839 kfree_skb(skb);
840 return -EINVAL;
841 }
842
843 /* now do the delete */
844 ret = tcf_action_destroy(actions, 0);
845 if (ret < 0) {
846 kfree_skb(skb);
847 return ret;
848 }
849
850 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
851 n->nlmsg_flags & NLM_F_ECHO);
852 if (ret > 0)
853 return 0;
854 return ret;
855}
856
857static int
858tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
859 u32 portid, int event)
860{
861 int i, ret;
862 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
863 struct tc_action *act;
864 LIST_HEAD(actions);
865
866 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
867 if (ret < 0)
868 return ret;
869
870 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
871 if (tb[1] != NULL)
872 return tca_action_flush(net, tb[1], n, portid);
873 else
874 return -EINVAL;
875 }
876
877 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
878 act = tcf_action_get_1(tb[i], n, portid);
879 if (IS_ERR(act)) {
880 ret = PTR_ERR(act);
881 goto err;
882 }
883 act->order = i;
884 list_add_tail(&act->list, &actions);
885 }
886
887 if (event == RTM_GETACTION)
888 ret = act_get_notify(net, portid, n, &actions, event);
889 else { /* delete */
890 ret = tcf_del_notify(net, n, &actions, portid);
891 if (ret)
892 goto err;
893 return ret;
894 }
895err:
896 cleanup_a(&actions);
897 return ret;
898}
899
900static int
901tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
902 u32 portid)
903{
904 struct sk_buff *skb;
905 int err = 0;
906
907 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
908 if (!skb)
909 return -ENOBUFS;
910
911 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
912 RTM_NEWACTION, 0, 0) <= 0) {
913 kfree_skb(skb);
914 return -EINVAL;
915 }
916
917 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
918 n->nlmsg_flags & NLM_F_ECHO);
919 if (err > 0)
920 err = 0;
921 return err;
922}
923
924static int
925tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
926 u32 portid, int ovr)
927{
928 int ret = 0;
929 LIST_HEAD(actions);
930
931 ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions);
932 if (ret)
933 goto done;
934
935 /* dump then free all the actions after update; inserted policy
936 * stays intact
937 */
938 ret = tcf_add_notify(net, n, &actions, portid);
939 cleanup_a(&actions);
940done:
941 return ret;
942}
943
944static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
945{
946 struct net *net = sock_net(skb->sk);
947 struct nlattr *tca[TCA_ACT_MAX + 1];
948 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
949 int ret = 0, ovr = 0;
950
951 if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN))
952 return -EPERM;
953
954 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
955 if (ret < 0)
956 return ret;
957
958 if (tca[TCA_ACT_TAB] == NULL) {
959 pr_notice("tc_ctl_action: received NO action attribs\n");
960 return -EINVAL;
961 }
962
963 /* n->nlmsg_flags & NLM_F_CREATE */
964 switch (n->nlmsg_type) {
965 case RTM_NEWACTION:
966 /* we are going to assume all other flags
967 * imply create only if it doesn't exist
968 * Note that CREATE | EXCL implies that
969 * but since we want avoid ambiguity (eg when flags
970 * is zero) then just set this
971 */
972 if (n->nlmsg_flags & NLM_F_REPLACE)
973 ovr = 1;
974replay:
975 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
976 if (ret == -EAGAIN)
977 goto replay;
978 break;
979 case RTM_DELACTION:
980 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
981 portid, RTM_DELACTION);
982 break;
983 case RTM_GETACTION:
984 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
985 portid, RTM_GETACTION);
986 break;
987 default:
988 BUG();
989 }
990
991 return ret;
992}
993
994static struct nlattr *
995find_dump_kind(const struct nlmsghdr *n)
996{
997 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
998 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
999 struct nlattr *nla[TCAA_MAX + 1];
1000 struct nlattr *kind;
1001
1002 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1003 return NULL;
1004 tb1 = nla[TCA_ACT_TAB];
1005 if (tb1 == NULL)
1006 return NULL;
1007
1008 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1009 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1010 return NULL;
1011
1012 if (tb[1] == NULL)
1013 return NULL;
1014 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1015 nla_len(tb[1]), NULL) < 0)
1016 return NULL;
1017 kind = tb2[TCA_ACT_KIND];
1018
1019 return kind;
1020}
1021
1022static int
1023tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1024{
1025 struct nlmsghdr *nlh;
1026 unsigned char *b = skb_tail_pointer(skb);
1027 struct nlattr *nest;
1028 struct tc_action_ops *a_o;
1029 struct tc_action a;
1030 int ret = 0;
1031 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1032 struct nlattr *kind = find_dump_kind(cb->nlh);
1033
1034 if (kind == NULL) {
1035 pr_info("tc_dump_action: action bad kind\n");
1036 return 0;
1037 }
1038
1039 a_o = tc_lookup_action(kind);
1040 if (a_o == NULL)
1041 return 0;
1042
1043 memset(&a, 0, sizeof(struct tc_action));
1044 a.ops = a_o;
1045
1046 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1047 cb->nlh->nlmsg_type, sizeof(*t), 0);
1048 if (!nlh)
1049 goto out_module_put;
1050 t = nlmsg_data(nlh);
1051 t->tca_family = AF_UNSPEC;
1052 t->tca__pad1 = 0;
1053 t->tca__pad2 = 0;
1054
1055 nest = nla_nest_start(skb, TCA_ACT_TAB);
1056 if (nest == NULL)
1057 goto out_module_put;
1058
1059 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1060 if (ret < 0)
1061 goto out_module_put;
1062
1063 if (ret > 0) {
1064 nla_nest_end(skb, nest);
1065 ret = skb->len;
1066 } else
1067 nla_nest_cancel(skb, nest);
1068
1069 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1070 if (NETLINK_CB(cb->skb).portid && ret)
1071 nlh->nlmsg_flags |= NLM_F_MULTI;
1072 module_put(a_o->owner);
1073 return skb->len;
1074
1075out_module_put:
1076 module_put(a_o->owner);
1077 nlmsg_trim(skb, b);
1078 return skb->len;
1079}
1080
1081static int __init tc_action_init(void)
1082{
1083 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1084 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1085 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1086 NULL);
1087
1088 return 0;
1089}
1090
1091subsys_initcall(tc_action_init);