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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 rcu_swap_protected(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(0) /* TCA_ACT_STATS nested */
189 /* TCA_STATS_BASIC */
190 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
191 /* TCA_STATS_QUEUE */
192 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
193 + nla_total_size(0) /* TCA_OPTIONS nested */
194 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
195}
196
197static size_t tcf_action_full_attrs_size(size_t sz)
198{
199 return NLMSG_HDRLEN /* struct nlmsghdr */
200 + sizeof(struct tcamsg)
201 + nla_total_size(0) /* TCA_ACT_TAB nested */
202 + sz;
203}
204
205static size_t tcf_action_fill_size(const struct tc_action *act)
206{
207 size_t sz = tcf_action_shared_attrs_size(act);
208
209 if (act->ops->get_fill_size)
210 return act->ops->get_fill_size(act) + sz;
211 return sz;
212}
213
214static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
215 struct netlink_callback *cb)
216{
217 int err = 0, index = -1, s_i = 0, n_i = 0;
218 u32 act_flags = cb->args[2];
219 unsigned long jiffy_since = cb->args[3];
220 struct nlattr *nest;
221 struct idr *idr = &idrinfo->action_idr;
222 struct tc_action *p;
223 unsigned long id = 1;
224 unsigned long tmp;
225
226 mutex_lock(&idrinfo->lock);
227
228 s_i = cb->args[0];
229
230 idr_for_each_entry_ul(idr, p, tmp, id) {
231 index++;
232 if (index < s_i)
233 continue;
234
235 if (jiffy_since &&
236 time_after(jiffy_since,
237 (unsigned long)p->tcfa_tm.lastuse))
238 continue;
239
240 nest = nla_nest_start_noflag(skb, n_i);
241 if (!nest) {
242 index--;
243 goto nla_put_failure;
244 }
245 err = tcf_action_dump_1(skb, p, 0, 0);
246 if (err < 0) {
247 index--;
248 nlmsg_trim(skb, nest);
249 goto done;
250 }
251 nla_nest_end(skb, nest);
252 n_i++;
253 if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) &&
254 n_i >= TCA_ACT_MAX_PRIO)
255 goto done;
256 }
257done:
258 if (index >= 0)
259 cb->args[0] = index + 1;
260
261 mutex_unlock(&idrinfo->lock);
262 if (n_i) {
263 if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
264 cb->args[1] = n_i;
265 }
266 return n_i;
267
268nla_put_failure:
269 nla_nest_cancel(skb, nest);
270 goto done;
271}
272
273static int tcf_idr_release_unsafe(struct tc_action *p)
274{
275 if (atomic_read(&p->tcfa_bindcnt) > 0)
276 return -EPERM;
277
278 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
279 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
280 tcf_action_cleanup(p);
281 return ACT_P_DELETED;
282 }
283
284 return 0;
285}
286
287static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
288 const struct tc_action_ops *ops)
289{
290 struct nlattr *nest;
291 int n_i = 0;
292 int ret = -EINVAL;
293 struct idr *idr = &idrinfo->action_idr;
294 struct tc_action *p;
295 unsigned long id = 1;
296 unsigned long tmp;
297
298 nest = nla_nest_start_noflag(skb, 0);
299 if (nest == NULL)
300 goto nla_put_failure;
301 if (nla_put_string(skb, TCA_KIND, ops->kind))
302 goto nla_put_failure;
303
304 mutex_lock(&idrinfo->lock);
305 idr_for_each_entry_ul(idr, p, tmp, id) {
306 ret = tcf_idr_release_unsafe(p);
307 if (ret == ACT_P_DELETED) {
308 module_put(ops->owner);
309 n_i++;
310 } else if (ret < 0) {
311 mutex_unlock(&idrinfo->lock);
312 goto nla_put_failure;
313 }
314 }
315 mutex_unlock(&idrinfo->lock);
316
317 if (nla_put_u32(skb, TCA_FCNT, n_i))
318 goto nla_put_failure;
319 nla_nest_end(skb, nest);
320
321 return n_i;
322nla_put_failure:
323 nla_nest_cancel(skb, nest);
324 return ret;
325}
326
327int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
328 struct netlink_callback *cb, int type,
329 const struct tc_action_ops *ops,
330 struct netlink_ext_ack *extack)
331{
332 struct tcf_idrinfo *idrinfo = tn->idrinfo;
333
334 if (type == RTM_DELACTION) {
335 return tcf_del_walker(idrinfo, skb, ops);
336 } else if (type == RTM_GETACTION) {
337 return tcf_dump_walker(idrinfo, skb, cb);
338 } else {
339 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
340 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
341 return -EINVAL;
342 }
343}
344EXPORT_SYMBOL(tcf_generic_walker);
345
346int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
347{
348 struct tcf_idrinfo *idrinfo = tn->idrinfo;
349 struct tc_action *p;
350
351 mutex_lock(&idrinfo->lock);
352 p = idr_find(&idrinfo->action_idr, index);
353 if (IS_ERR(p))
354 p = NULL;
355 else if (p)
356 refcount_inc(&p->tcfa_refcnt);
357 mutex_unlock(&idrinfo->lock);
358
359 if (p) {
360 *a = p;
361 return true;
362 }
363 return false;
364}
365EXPORT_SYMBOL(tcf_idr_search);
366
367static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
368{
369 struct tc_action *p;
370 int ret = 0;
371
372 mutex_lock(&idrinfo->lock);
373 p = idr_find(&idrinfo->action_idr, index);
374 if (!p) {
375 mutex_unlock(&idrinfo->lock);
376 return -ENOENT;
377 }
378
379 if (!atomic_read(&p->tcfa_bindcnt)) {
380 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
381 struct module *owner = p->ops->owner;
382
383 WARN_ON(p != idr_remove(&idrinfo->action_idr,
384 p->tcfa_index));
385 mutex_unlock(&idrinfo->lock);
386
387 tcf_action_cleanup(p);
388 module_put(owner);
389 return 0;
390 }
391 ret = 0;
392 } else {
393 ret = -EPERM;
394 }
395
396 mutex_unlock(&idrinfo->lock);
397 return ret;
398}
399
400int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
401 struct tc_action **a, const struct tc_action_ops *ops,
402 int bind, bool cpustats)
403{
404 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
405 struct tcf_idrinfo *idrinfo = tn->idrinfo;
406 int err = -ENOMEM;
407
408 if (unlikely(!p))
409 return -ENOMEM;
410 refcount_set(&p->tcfa_refcnt, 1);
411 if (bind)
412 atomic_set(&p->tcfa_bindcnt, 1);
413
414 if (cpustats) {
415 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
416 if (!p->cpu_bstats)
417 goto err1;
418 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
419 if (!p->cpu_bstats_hw)
420 goto err2;
421 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
422 if (!p->cpu_qstats)
423 goto err3;
424 }
425 spin_lock_init(&p->tcfa_lock);
426 p->tcfa_index = index;
427 p->tcfa_tm.install = jiffies;
428 p->tcfa_tm.lastuse = jiffies;
429 p->tcfa_tm.firstuse = 0;
430 if (est) {
431 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
432 &p->tcfa_rate_est,
433 &p->tcfa_lock, NULL, est);
434 if (err)
435 goto err4;
436 }
437
438 p->idrinfo = idrinfo;
439 p->ops = ops;
440 *a = p;
441 return 0;
442err4:
443 free_percpu(p->cpu_qstats);
444err3:
445 free_percpu(p->cpu_bstats_hw);
446err2:
447 free_percpu(p->cpu_bstats);
448err1:
449 kfree(p);
450 return err;
451}
452EXPORT_SYMBOL(tcf_idr_create);
453
454void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
455{
456 struct tcf_idrinfo *idrinfo = tn->idrinfo;
457
458 mutex_lock(&idrinfo->lock);
459 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
460 WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index)));
461 mutex_unlock(&idrinfo->lock);
462}
463EXPORT_SYMBOL(tcf_idr_insert);
464
465/* Cleanup idr index that was allocated but not initialized. */
466
467void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
468{
469 struct tcf_idrinfo *idrinfo = tn->idrinfo;
470
471 mutex_lock(&idrinfo->lock);
472 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
473 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
474 mutex_unlock(&idrinfo->lock);
475}
476EXPORT_SYMBOL(tcf_idr_cleanup);
477
478/* Check if action with specified index exists. If actions is found, increments
479 * its reference and bind counters, and return 1. Otherwise insert temporary
480 * error pointer (to prevent concurrent users from inserting actions with same
481 * index) and return 0.
482 */
483
484int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
485 struct tc_action **a, int bind)
486{
487 struct tcf_idrinfo *idrinfo = tn->idrinfo;
488 struct tc_action *p;
489 int ret;
490
491again:
492 mutex_lock(&idrinfo->lock);
493 if (*index) {
494 p = idr_find(&idrinfo->action_idr, *index);
495 if (IS_ERR(p)) {
496 /* This means that another process allocated
497 * index but did not assign the pointer yet.
498 */
499 mutex_unlock(&idrinfo->lock);
500 goto again;
501 }
502
503 if (p) {
504 refcount_inc(&p->tcfa_refcnt);
505 if (bind)
506 atomic_inc(&p->tcfa_bindcnt);
507 *a = p;
508 ret = 1;
509 } else {
510 *a = NULL;
511 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
512 *index, GFP_KERNEL);
513 if (!ret)
514 idr_replace(&idrinfo->action_idr,
515 ERR_PTR(-EBUSY), *index);
516 }
517 } else {
518 *index = 1;
519 *a = NULL;
520 ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index,
521 UINT_MAX, GFP_KERNEL);
522 if (!ret)
523 idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY),
524 *index);
525 }
526 mutex_unlock(&idrinfo->lock);
527 return ret;
528}
529EXPORT_SYMBOL(tcf_idr_check_alloc);
530
531void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
532 struct tcf_idrinfo *idrinfo)
533{
534 struct idr *idr = &idrinfo->action_idr;
535 struct tc_action *p;
536 int ret;
537 unsigned long id = 1;
538 unsigned long tmp;
539
540 idr_for_each_entry_ul(idr, p, tmp, id) {
541 ret = __tcf_idr_release(p, false, true);
542 if (ret == ACT_P_DELETED)
543 module_put(ops->owner);
544 else if (ret < 0)
545 return;
546 }
547 idr_destroy(&idrinfo->action_idr);
548}
549EXPORT_SYMBOL(tcf_idrinfo_destroy);
550
551static LIST_HEAD(act_base);
552static DEFINE_RWLOCK(act_mod_lock);
553
554int tcf_register_action(struct tc_action_ops *act,
555 struct pernet_operations *ops)
556{
557 struct tc_action_ops *a;
558 int ret;
559
560 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
561 return -EINVAL;
562
563 /* We have to register pernet ops before making the action ops visible,
564 * otherwise tcf_action_init_1() could get a partially initialized
565 * netns.
566 */
567 ret = register_pernet_subsys(ops);
568 if (ret)
569 return ret;
570
571 write_lock(&act_mod_lock);
572 list_for_each_entry(a, &act_base, head) {
573 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
574 write_unlock(&act_mod_lock);
575 unregister_pernet_subsys(ops);
576 return -EEXIST;
577 }
578 }
579 list_add_tail(&act->head, &act_base);
580 write_unlock(&act_mod_lock);
581
582 return 0;
583}
584EXPORT_SYMBOL(tcf_register_action);
585
586int tcf_unregister_action(struct tc_action_ops *act,
587 struct pernet_operations *ops)
588{
589 struct tc_action_ops *a;
590 int err = -ENOENT;
591
592 write_lock(&act_mod_lock);
593 list_for_each_entry(a, &act_base, head) {
594 if (a == act) {
595 list_del(&act->head);
596 err = 0;
597 break;
598 }
599 }
600 write_unlock(&act_mod_lock);
601 if (!err)
602 unregister_pernet_subsys(ops);
603 return err;
604}
605EXPORT_SYMBOL(tcf_unregister_action);
606
607/* lookup by name */
608static struct tc_action_ops *tc_lookup_action_n(char *kind)
609{
610 struct tc_action_ops *a, *res = NULL;
611
612 if (kind) {
613 read_lock(&act_mod_lock);
614 list_for_each_entry(a, &act_base, head) {
615 if (strcmp(kind, a->kind) == 0) {
616 if (try_module_get(a->owner))
617 res = a;
618 break;
619 }
620 }
621 read_unlock(&act_mod_lock);
622 }
623 return res;
624}
625
626/* lookup by nlattr */
627static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
628{
629 struct tc_action_ops *a, *res = NULL;
630
631 if (kind) {
632 read_lock(&act_mod_lock);
633 list_for_each_entry(a, &act_base, head) {
634 if (nla_strcmp(kind, a->kind) == 0) {
635 if (try_module_get(a->owner))
636 res = a;
637 break;
638 }
639 }
640 read_unlock(&act_mod_lock);
641 }
642 return res;
643}
644
645/*TCA_ACT_MAX_PRIO is 32, there count upto 32 */
646#define TCA_ACT_MAX_PRIO_MASK 0x1FF
647int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
648 int nr_actions, struct tcf_result *res)
649{
650 u32 jmp_prgcnt = 0;
651 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
652 int i;
653 int ret = TC_ACT_OK;
654
655 if (skb_skip_tc_classify(skb))
656 return TC_ACT_OK;
657
658restart_act_graph:
659 for (i = 0; i < nr_actions; i++) {
660 const struct tc_action *a = actions[i];
661
662 if (jmp_prgcnt > 0) {
663 jmp_prgcnt -= 1;
664 continue;
665 }
666repeat:
667 ret = a->ops->act(skb, a, res);
668 if (ret == TC_ACT_REPEAT)
669 goto repeat; /* we need a ttl - JHS */
670
671 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
672 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
673 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
674 /* faulty opcode, stop pipeline */
675 return TC_ACT_OK;
676 } else {
677 jmp_ttl -= 1;
678 if (jmp_ttl > 0)
679 goto restart_act_graph;
680 else /* faulty graph, stop pipeline */
681 return TC_ACT_OK;
682 }
683 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
684 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
685 net_warn_ratelimited("can't go to NULL chain!\n");
686 return TC_ACT_SHOT;
687 }
688 tcf_action_goto_chain_exec(a, res);
689 }
690
691 if (ret != TC_ACT_PIPE)
692 break;
693 }
694
695 return ret;
696}
697EXPORT_SYMBOL(tcf_action_exec);
698
699int tcf_action_destroy(struct tc_action *actions[], int bind)
700{
701 const struct tc_action_ops *ops;
702 struct tc_action *a;
703 int ret = 0, i;
704
705 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
706 a = actions[i];
707 actions[i] = NULL;
708 ops = a->ops;
709 ret = __tcf_idr_release(a, bind, true);
710 if (ret == ACT_P_DELETED)
711 module_put(ops->owner);
712 else if (ret < 0)
713 return ret;
714 }
715 return ret;
716}
717
718static int tcf_action_destroy_1(struct tc_action *a, int bind)
719{
720 struct tc_action *actions[] = { a, NULL };
721
722 return tcf_action_destroy(actions, bind);
723}
724
725static int tcf_action_put(struct tc_action *p)
726{
727 return __tcf_action_put(p, false);
728}
729
730/* Put all actions in this array, skip those NULL's. */
731static void tcf_action_put_many(struct tc_action *actions[])
732{
733 int i;
734
735 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
736 struct tc_action *a = actions[i];
737 const struct tc_action_ops *ops;
738
739 if (!a)
740 continue;
741 ops = a->ops;
742 if (tcf_action_put(a))
743 module_put(ops->owner);
744 }
745}
746
747int
748tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
749{
750 return a->ops->dump(skb, a, bind, ref);
751}
752
753int
754tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
755{
756 int err = -EINVAL;
757 unsigned char *b = skb_tail_pointer(skb);
758 struct nlattr *nest;
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 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
777 if (nest == NULL)
778 goto nla_put_failure;
779 err = tcf_action_dump_old(skb, a, bind, ref);
780 if (err > 0) {
781 nla_nest_end(skb, nest);
782 return err;
783 }
784
785nla_put_failure:
786 nlmsg_trim(skb, b);
787 return -1;
788}
789EXPORT_SYMBOL(tcf_action_dump_1);
790
791int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
792 int bind, int ref)
793{
794 struct tc_action *a;
795 int err = -EINVAL, i;
796 struct nlattr *nest;
797
798 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
799 a = actions[i];
800 nest = nla_nest_start_noflag(skb, i + 1);
801 if (nest == NULL)
802 goto nla_put_failure;
803 err = tcf_action_dump_1(skb, a, bind, ref);
804 if (err < 0)
805 goto errout;
806 nla_nest_end(skb, nest);
807 }
808
809 return 0;
810
811nla_put_failure:
812 err = -EINVAL;
813errout:
814 nla_nest_cancel(skb, nest);
815 return err;
816}
817
818static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
819{
820 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
821 if (!c)
822 return NULL;
823
824 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
825 if (!c->data) {
826 kfree(c);
827 return NULL;
828 }
829 c->len = nla_len(tb[TCA_ACT_COOKIE]);
830
831 return c;
832}
833
834static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
835 [TCA_ACT_KIND] = { .type = NLA_STRING },
836 [TCA_ACT_INDEX] = { .type = NLA_U32 },
837 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
838 .len = TC_COOKIE_MAX_SIZE },
839 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
840};
841
842struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
843 struct nlattr *nla, struct nlattr *est,
844 char *name, int ovr, int bind,
845 bool rtnl_held,
846 struct netlink_ext_ack *extack)
847{
848 struct tc_action *a;
849 struct tc_action_ops *a_o;
850 struct tc_cookie *cookie = NULL;
851 char act_name[IFNAMSIZ];
852 struct nlattr *tb[TCA_ACT_MAX + 1];
853 struct nlattr *kind;
854 int err;
855
856 if (name == NULL) {
857 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
858 tcf_action_policy, extack);
859 if (err < 0)
860 goto err_out;
861 err = -EINVAL;
862 kind = tb[TCA_ACT_KIND];
863 if (!kind) {
864 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
865 goto err_out;
866 }
867 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
868 NL_SET_ERR_MSG(extack, "TC action name too long");
869 goto err_out;
870 }
871 if (tb[TCA_ACT_COOKIE]) {
872 cookie = nla_memdup_cookie(tb);
873 if (!cookie) {
874 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
875 err = -ENOMEM;
876 goto err_out;
877 }
878 }
879 } else {
880 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) {
881 NL_SET_ERR_MSG(extack, "TC action name too long");
882 err = -EINVAL;
883 goto err_out;
884 }
885 }
886
887 a_o = tc_lookup_action_n(act_name);
888 if (a_o == NULL) {
889#ifdef CONFIG_MODULES
890 if (rtnl_held)
891 rtnl_unlock();
892 request_module("act_%s", act_name);
893 if (rtnl_held)
894 rtnl_lock();
895
896 a_o = tc_lookup_action_n(act_name);
897
898 /* We dropped the RTNL semaphore in order to
899 * perform the module load. So, even if we
900 * succeeded in loading the module we have to
901 * tell the caller to replay the request. We
902 * indicate this using -EAGAIN.
903 */
904 if (a_o != NULL) {
905 err = -EAGAIN;
906 goto err_mod;
907 }
908#endif
909 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
910 err = -ENOENT;
911 goto err_out;
912 }
913
914 /* backward compatibility for policer */
915 if (name == NULL)
916 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind,
917 rtnl_held, tp, extack);
918 else
919 err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held,
920 tp, extack);
921 if (err < 0)
922 goto err_mod;
923
924 if (!name && tb[TCA_ACT_COOKIE])
925 tcf_set_action_cookie(&a->act_cookie, cookie);
926
927 /* module count goes up only when brand new policy is created
928 * if it exists and is only bound to in a_o->init() then
929 * ACT_P_CREATED is not returned (a zero is).
930 */
931 if (err != ACT_P_CREATED)
932 module_put(a_o->owner);
933
934 if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN) &&
935 !rcu_access_pointer(a->goto_chain)) {
936 tcf_action_destroy_1(a, bind);
937 NL_SET_ERR_MSG(extack, "can't use goto chain with NULL chain");
938 return ERR_PTR(-EINVAL);
939 }
940
941 return a;
942
943err_mod:
944 module_put(a_o->owner);
945err_out:
946 if (cookie) {
947 kfree(cookie->data);
948 kfree(cookie);
949 }
950 return ERR_PTR(err);
951}
952
953/* Returns numbers of initialized actions or negative error. */
954
955int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
956 struct nlattr *est, char *name, int ovr, int bind,
957 struct tc_action *actions[], size_t *attr_size,
958 bool rtnl_held, struct netlink_ext_ack *extack)
959{
960 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
961 struct tc_action *act;
962 size_t sz = 0;
963 int err;
964 int i;
965
966 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
967 extack);
968 if (err < 0)
969 return err;
970
971 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
972 act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
973 rtnl_held, extack);
974 if (IS_ERR(act)) {
975 err = PTR_ERR(act);
976 goto err;
977 }
978 act->order = i;
979 sz += tcf_action_fill_size(act);
980 /* Start from index 0 */
981 actions[i - 1] = act;
982 }
983
984 *attr_size = tcf_action_full_attrs_size(sz);
985 return i - 1;
986
987err:
988 tcf_action_destroy(actions, bind);
989 return err;
990}
991
992int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
993 int compat_mode)
994{
995 int err = 0;
996 struct gnet_dump d;
997
998 if (p == NULL)
999 goto errout;
1000
1001 /* compat_mode being true specifies a call that is supposed
1002 * to add additional backward compatibility statistic TLVs.
1003 */
1004 if (compat_mode) {
1005 if (p->type == TCA_OLD_COMPAT)
1006 err = gnet_stats_start_copy_compat(skb, 0,
1007 TCA_STATS,
1008 TCA_XSTATS,
1009 &p->tcfa_lock, &d,
1010 TCA_PAD);
1011 else
1012 return 0;
1013 } else
1014 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1015 &p->tcfa_lock, &d, TCA_ACT_PAD);
1016
1017 if (err < 0)
1018 goto errout;
1019
1020 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
1021 gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
1022 &p->tcfa_bstats_hw) < 0 ||
1023 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1024 gnet_stats_copy_queue(&d, p->cpu_qstats,
1025 &p->tcfa_qstats,
1026 p->tcfa_qstats.qlen) < 0)
1027 goto errout;
1028
1029 if (gnet_stats_finish_copy(&d) < 0)
1030 goto errout;
1031
1032 return 0;
1033
1034errout:
1035 return -1;
1036}
1037
1038static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1039 u32 portid, u32 seq, u16 flags, int event, int bind,
1040 int ref)
1041{
1042 struct tcamsg *t;
1043 struct nlmsghdr *nlh;
1044 unsigned char *b = skb_tail_pointer(skb);
1045 struct nlattr *nest;
1046
1047 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1048 if (!nlh)
1049 goto out_nlmsg_trim;
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_noflag(skb, TCA_ACT_TAB);
1056 if (!nest)
1057 goto out_nlmsg_trim;
1058
1059 if (tcf_action_dump(skb, actions, bind, ref) < 0)
1060 goto out_nlmsg_trim;
1061
1062 nla_nest_end(skb, nest);
1063
1064 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1065 return skb->len;
1066
1067out_nlmsg_trim:
1068 nlmsg_trim(skb, b);
1069 return -1;
1070}
1071
1072static int
1073tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1074 struct tc_action *actions[], int event,
1075 struct netlink_ext_ack *extack)
1076{
1077 struct sk_buff *skb;
1078
1079 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1080 if (!skb)
1081 return -ENOBUFS;
1082 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1083 0, 1) <= 0) {
1084 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1085 kfree_skb(skb);
1086 return -EINVAL;
1087 }
1088
1089 return rtnl_unicast(skb, net, portid);
1090}
1091
1092static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1093 struct nlmsghdr *n, u32 portid,
1094 struct netlink_ext_ack *extack)
1095{
1096 struct nlattr *tb[TCA_ACT_MAX + 1];
1097 const struct tc_action_ops *ops;
1098 struct tc_action *a;
1099 int index;
1100 int err;
1101
1102 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1103 tcf_action_policy, extack);
1104 if (err < 0)
1105 goto err_out;
1106
1107 err = -EINVAL;
1108 if (tb[TCA_ACT_INDEX] == NULL ||
1109 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1110 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1111 goto err_out;
1112 }
1113 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1114
1115 err = -EINVAL;
1116 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1117 if (!ops) { /* could happen in batch of actions */
1118 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1119 goto err_out;
1120 }
1121 err = -ENOENT;
1122 if (ops->lookup(net, &a, index) == 0) {
1123 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1124 goto err_mod;
1125 }
1126
1127 module_put(ops->owner);
1128 return a;
1129
1130err_mod:
1131 module_put(ops->owner);
1132err_out:
1133 return ERR_PTR(err);
1134}
1135
1136static int tca_action_flush(struct net *net, struct nlattr *nla,
1137 struct nlmsghdr *n, u32 portid,
1138 struct netlink_ext_ack *extack)
1139{
1140 struct sk_buff *skb;
1141 unsigned char *b;
1142 struct nlmsghdr *nlh;
1143 struct tcamsg *t;
1144 struct netlink_callback dcb;
1145 struct nlattr *nest;
1146 struct nlattr *tb[TCA_ACT_MAX + 1];
1147 const struct tc_action_ops *ops;
1148 struct nlattr *kind;
1149 int err = -ENOMEM;
1150
1151 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1152 if (!skb)
1153 return err;
1154
1155 b = skb_tail_pointer(skb);
1156
1157 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1158 tcf_action_policy, extack);
1159 if (err < 0)
1160 goto err_out;
1161
1162 err = -EINVAL;
1163 kind = tb[TCA_ACT_KIND];
1164 ops = tc_lookup_action(kind);
1165 if (!ops) { /*some idjot trying to flush unknown action */
1166 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1167 goto err_out;
1168 }
1169
1170 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1171 sizeof(*t), 0);
1172 if (!nlh) {
1173 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1174 goto out_module_put;
1175 }
1176 t = nlmsg_data(nlh);
1177 t->tca_family = AF_UNSPEC;
1178 t->tca__pad1 = 0;
1179 t->tca__pad2 = 0;
1180
1181 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1182 if (!nest) {
1183 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1184 goto out_module_put;
1185 }
1186
1187 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack);
1188 if (err <= 0) {
1189 nla_nest_cancel(skb, nest);
1190 goto out_module_put;
1191 }
1192
1193 nla_nest_end(skb, nest);
1194
1195 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1196 nlh->nlmsg_flags |= NLM_F_ROOT;
1197 module_put(ops->owner);
1198 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1199 n->nlmsg_flags & NLM_F_ECHO);
1200 if (err > 0)
1201 return 0;
1202 if (err < 0)
1203 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1204
1205 return err;
1206
1207out_module_put:
1208 module_put(ops->owner);
1209err_out:
1210 kfree_skb(skb);
1211 return err;
1212}
1213
1214static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1215{
1216 int i;
1217
1218 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1219 struct tc_action *a = actions[i];
1220 const struct tc_action_ops *ops = a->ops;
1221 /* Actions can be deleted concurrently so we must save their
1222 * type and id to search again after reference is released.
1223 */
1224 struct tcf_idrinfo *idrinfo = a->idrinfo;
1225 u32 act_index = a->tcfa_index;
1226
1227 actions[i] = NULL;
1228 if (tcf_action_put(a)) {
1229 /* last reference, action was deleted concurrently */
1230 module_put(ops->owner);
1231 } else {
1232 int ret;
1233
1234 /* now do the delete */
1235 ret = tcf_idr_delete_index(idrinfo, act_index);
1236 if (ret < 0)
1237 return ret;
1238 }
1239 }
1240 return 0;
1241}
1242
1243static int
1244tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1245 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1246{
1247 int ret;
1248 struct sk_buff *skb;
1249
1250 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1251 GFP_KERNEL);
1252 if (!skb)
1253 return -ENOBUFS;
1254
1255 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1256 0, 2) <= 0) {
1257 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1258 kfree_skb(skb);
1259 return -EINVAL;
1260 }
1261
1262 /* now do the delete */
1263 ret = tcf_action_delete(net, actions);
1264 if (ret < 0) {
1265 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1266 kfree_skb(skb);
1267 return ret;
1268 }
1269
1270 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1271 n->nlmsg_flags & NLM_F_ECHO);
1272 if (ret > 0)
1273 return 0;
1274 return ret;
1275}
1276
1277static int
1278tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1279 u32 portid, int event, struct netlink_ext_ack *extack)
1280{
1281 int i, ret;
1282 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1283 struct tc_action *act;
1284 size_t attr_size = 0;
1285 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1286
1287 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1288 extack);
1289 if (ret < 0)
1290 return ret;
1291
1292 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1293 if (tb[1])
1294 return tca_action_flush(net, tb[1], n, portid, extack);
1295
1296 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1297 return -EINVAL;
1298 }
1299
1300 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1301 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1302 if (IS_ERR(act)) {
1303 ret = PTR_ERR(act);
1304 goto err;
1305 }
1306 attr_size += tcf_action_fill_size(act);
1307 actions[i - 1] = act;
1308 }
1309
1310 attr_size = tcf_action_full_attrs_size(attr_size);
1311
1312 if (event == RTM_GETACTION)
1313 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1314 else { /* delete */
1315 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1316 if (ret)
1317 goto err;
1318 return 0;
1319 }
1320err:
1321 tcf_action_put_many(actions);
1322 return ret;
1323}
1324
1325static int
1326tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1327 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1328{
1329 struct sk_buff *skb;
1330 int err = 0;
1331
1332 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1333 GFP_KERNEL);
1334 if (!skb)
1335 return -ENOBUFS;
1336
1337 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1338 RTM_NEWACTION, 0, 0) <= 0) {
1339 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1340 kfree_skb(skb);
1341 return -EINVAL;
1342 }
1343
1344 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1345 n->nlmsg_flags & NLM_F_ECHO);
1346 if (err > 0)
1347 err = 0;
1348 return err;
1349}
1350
1351static int tcf_action_add(struct net *net, struct nlattr *nla,
1352 struct nlmsghdr *n, u32 portid, int ovr,
1353 struct netlink_ext_ack *extack)
1354{
1355 size_t attr_size = 0;
1356 int loop, ret;
1357 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1358
1359 for (loop = 0; loop < 10; loop++) {
1360 ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0,
1361 actions, &attr_size, true, extack);
1362 if (ret != -EAGAIN)
1363 break;
1364 }
1365
1366 if (ret < 0)
1367 return ret;
1368 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
1369 if (ovr)
1370 tcf_action_put_many(actions);
1371
1372 return ret;
1373}
1374
1375static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON;
1376static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
1377 [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32,
1378 .validation_data = &tcaa_root_flags_allowed },
1379 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
1380};
1381
1382static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
1383 struct netlink_ext_ack *extack)
1384{
1385 struct net *net = sock_net(skb->sk);
1386 struct nlattr *tca[TCA_ROOT_MAX + 1];
1387 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1388 int ret = 0, ovr = 0;
1389
1390 if ((n->nlmsg_type != RTM_GETACTION) &&
1391 !netlink_capable(skb, CAP_NET_ADMIN))
1392 return -EPERM;
1393
1394 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
1395 TCA_ROOT_MAX, NULL, extack);
1396 if (ret < 0)
1397 return ret;
1398
1399 if (tca[TCA_ACT_TAB] == NULL) {
1400 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
1401 return -EINVAL;
1402 }
1403
1404 /* n->nlmsg_flags & NLM_F_CREATE */
1405 switch (n->nlmsg_type) {
1406 case RTM_NEWACTION:
1407 /* we are going to assume all other flags
1408 * imply create only if it doesn't exist
1409 * Note that CREATE | EXCL implies that
1410 * but since we want avoid ambiguity (eg when flags
1411 * is zero) then just set this
1412 */
1413 if (n->nlmsg_flags & NLM_F_REPLACE)
1414 ovr = 1;
1415 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr,
1416 extack);
1417 break;
1418 case RTM_DELACTION:
1419 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1420 portid, RTM_DELACTION, extack);
1421 break;
1422 case RTM_GETACTION:
1423 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1424 portid, RTM_GETACTION, extack);
1425 break;
1426 default:
1427 BUG();
1428 }
1429
1430 return ret;
1431}
1432
1433static struct nlattr *find_dump_kind(struct nlattr **nla)
1434{
1435 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1436 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1437 struct nlattr *kind;
1438
1439 tb1 = nla[TCA_ACT_TAB];
1440 if (tb1 == NULL)
1441 return NULL;
1442
1443 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
1444 return NULL;
1445
1446 if (tb[1] == NULL)
1447 return NULL;
1448 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
1449 return NULL;
1450 kind = tb2[TCA_ACT_KIND];
1451
1452 return kind;
1453}
1454
1455static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1456{
1457 struct net *net = sock_net(skb->sk);
1458 struct nlmsghdr *nlh;
1459 unsigned char *b = skb_tail_pointer(skb);
1460 struct nlattr *nest;
1461 struct tc_action_ops *a_o;
1462 int ret = 0;
1463 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1464 struct nlattr *tb[TCA_ROOT_MAX + 1];
1465 struct nlattr *count_attr = NULL;
1466 unsigned long jiffy_since = 0;
1467 struct nlattr *kind = NULL;
1468 struct nla_bitfield32 bf;
1469 u32 msecs_since = 0;
1470 u32 act_count = 0;
1471
1472 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
1473 TCA_ROOT_MAX, tcaa_policy, cb->extack);
1474 if (ret < 0)
1475 return ret;
1476
1477 kind = find_dump_kind(tb);
1478 if (kind == NULL) {
1479 pr_info("tc_dump_action: action bad kind\n");
1480 return 0;
1481 }
1482
1483 a_o = tc_lookup_action(kind);
1484 if (a_o == NULL)
1485 return 0;
1486
1487 cb->args[2] = 0;
1488 if (tb[TCA_ROOT_FLAGS]) {
1489 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
1490 cb->args[2] = bf.value;
1491 }
1492
1493 if (tb[TCA_ROOT_TIME_DELTA]) {
1494 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
1495 }
1496
1497 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1498 cb->nlh->nlmsg_type, sizeof(*t), 0);
1499 if (!nlh)
1500 goto out_module_put;
1501
1502 if (msecs_since)
1503 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
1504
1505 t = nlmsg_data(nlh);
1506 t->tca_family = AF_UNSPEC;
1507 t->tca__pad1 = 0;
1508 t->tca__pad2 = 0;
1509 cb->args[3] = jiffy_since;
1510 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
1511 if (!count_attr)
1512 goto out_module_put;
1513
1514 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1515 if (nest == NULL)
1516 goto out_module_put;
1517
1518 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL);
1519 if (ret < 0)
1520 goto out_module_put;
1521
1522 if (ret > 0) {
1523 nla_nest_end(skb, nest);
1524 ret = skb->len;
1525 act_count = cb->args[1];
1526 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
1527 cb->args[1] = 0;
1528 } else
1529 nlmsg_trim(skb, b);
1530
1531 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1532 if (NETLINK_CB(cb->skb).portid && ret)
1533 nlh->nlmsg_flags |= NLM_F_MULTI;
1534 module_put(a_o->owner);
1535 return skb->len;
1536
1537out_module_put:
1538 module_put(a_o->owner);
1539 nlmsg_trim(skb, b);
1540 return skb->len;
1541}
1542
1543static int __init tc_action_init(void)
1544{
1545 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
1546 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
1547 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1548 0);
1549
1550 return 0;
1551}
1552
1553subsys_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 <net/net_namespace.h>
24#include <net/sock.h>
25#include <net/sch_generic.h>
26#include <net/act_api.h>
27#include <net/netlink.h>
28
29void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
30{
31 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
32 struct tcf_common **p1p;
33
34 for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
35 if (*p1p == p) {
36 write_lock_bh(hinfo->lock);
37 *p1p = p->tcfc_next;
38 write_unlock_bh(hinfo->lock);
39 gen_kill_estimator(&p->tcfc_bstats,
40 &p->tcfc_rate_est);
41 /*
42 * gen_estimator est_timer() might access p->tcfc_lock
43 * or bstats, wait a RCU grace period before freeing p
44 */
45 kfree_rcu(p, tcfc_rcu);
46 return;
47 }
48 }
49 WARN_ON(1);
50}
51EXPORT_SYMBOL(tcf_hash_destroy);
52
53int tcf_hash_release(struct tcf_common *p, int bind,
54 struct tcf_hashinfo *hinfo)
55{
56 int ret = 0;
57
58 if (p) {
59 if (bind)
60 p->tcfc_bindcnt--;
61
62 p->tcfc_refcnt--;
63 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
64 tcf_hash_destroy(p, hinfo);
65 ret = 1;
66 }
67 }
68 return ret;
69}
70EXPORT_SYMBOL(tcf_hash_release);
71
72static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
73 struct tc_action *a, struct tcf_hashinfo *hinfo)
74{
75 struct tcf_common *p;
76 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
77 struct nlattr *nest;
78
79 read_lock_bh(hinfo->lock);
80
81 s_i = cb->args[0];
82
83 for (i = 0; i < (hinfo->hmask + 1); i++) {
84 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
85
86 for (; p; p = p->tcfc_next) {
87 index++;
88 if (index < s_i)
89 continue;
90 a->priv = p;
91 a->order = n_i;
92
93 nest = nla_nest_start(skb, a->order);
94 if (nest == NULL)
95 goto nla_put_failure;
96 err = tcf_action_dump_1(skb, a, 0, 0);
97 if (err < 0) {
98 index--;
99 nlmsg_trim(skb, nest);
100 goto done;
101 }
102 nla_nest_end(skb, nest);
103 n_i++;
104 if (n_i >= TCA_ACT_MAX_PRIO)
105 goto done;
106 }
107 }
108done:
109 read_unlock_bh(hinfo->lock);
110 if (n_i)
111 cb->args[0] += n_i;
112 return n_i;
113
114nla_put_failure:
115 nla_nest_cancel(skb, nest);
116 goto done;
117}
118
119static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
120 struct tcf_hashinfo *hinfo)
121{
122 struct tcf_common *p, *s_p;
123 struct nlattr *nest;
124 int i = 0, n_i = 0;
125
126 nest = nla_nest_start(skb, a->order);
127 if (nest == NULL)
128 goto nla_put_failure;
129 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
130 for (i = 0; i < (hinfo->hmask + 1); i++) {
131 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
132
133 while (p != NULL) {
134 s_p = p->tcfc_next;
135 if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
136 module_put(a->ops->owner);
137 n_i++;
138 p = s_p;
139 }
140 }
141 NLA_PUT_U32(skb, TCA_FCNT, n_i);
142 nla_nest_end(skb, nest);
143
144 return n_i;
145nla_put_failure:
146 nla_nest_cancel(skb, nest);
147 return -EINVAL;
148}
149
150int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
151 int type, struct tc_action *a)
152{
153 struct tcf_hashinfo *hinfo = a->ops->hinfo;
154
155 if (type == RTM_DELACTION) {
156 return tcf_del_walker(skb, a, hinfo);
157 } else if (type == RTM_GETACTION) {
158 return tcf_dump_walker(skb, cb, a, hinfo);
159 } else {
160 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
161 return -EINVAL;
162 }
163}
164EXPORT_SYMBOL(tcf_generic_walker);
165
166struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
167{
168 struct tcf_common *p;
169
170 read_lock_bh(hinfo->lock);
171 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
172 p = p->tcfc_next) {
173 if (p->tcfc_index == index)
174 break;
175 }
176 read_unlock_bh(hinfo->lock);
177
178 return p;
179}
180EXPORT_SYMBOL(tcf_hash_lookup);
181
182u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
183{
184 u32 val = *idx_gen;
185
186 do {
187 if (++val == 0)
188 val = 1;
189 } while (tcf_hash_lookup(val, hinfo));
190
191 return (*idx_gen = val);
192}
193EXPORT_SYMBOL(tcf_hash_new_index);
194
195int tcf_hash_search(struct tc_action *a, u32 index)
196{
197 struct tcf_hashinfo *hinfo = a->ops->hinfo;
198 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
199
200 if (p) {
201 a->priv = p;
202 return 1;
203 }
204 return 0;
205}
206EXPORT_SYMBOL(tcf_hash_search);
207
208struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
209 struct tcf_hashinfo *hinfo)
210{
211 struct tcf_common *p = NULL;
212 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
213 if (bind)
214 p->tcfc_bindcnt++;
215 p->tcfc_refcnt++;
216 a->priv = p;
217 }
218 return p;
219}
220EXPORT_SYMBOL(tcf_hash_check);
221
222struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est,
223 struct tc_action *a, int size, int bind,
224 u32 *idx_gen, struct tcf_hashinfo *hinfo)
225{
226 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
227
228 if (unlikely(!p))
229 return ERR_PTR(-ENOMEM);
230 p->tcfc_refcnt = 1;
231 if (bind)
232 p->tcfc_bindcnt = 1;
233
234 spin_lock_init(&p->tcfc_lock);
235 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
236 p->tcfc_tm.install = jiffies;
237 p->tcfc_tm.lastuse = jiffies;
238 if (est) {
239 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
240 &p->tcfc_lock, est);
241 if (err) {
242 kfree(p);
243 return ERR_PTR(err);
244 }
245 }
246
247 a->priv = (void *) p;
248 return p;
249}
250EXPORT_SYMBOL(tcf_hash_create);
251
252void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
253{
254 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
255
256 write_lock_bh(hinfo->lock);
257 p->tcfc_next = hinfo->htab[h];
258 hinfo->htab[h] = p;
259 write_unlock_bh(hinfo->lock);
260}
261EXPORT_SYMBOL(tcf_hash_insert);
262
263static struct tc_action_ops *act_base = NULL;
264static DEFINE_RWLOCK(act_mod_lock);
265
266int tcf_register_action(struct tc_action_ops *act)
267{
268 struct tc_action_ops *a, **ap;
269
270 write_lock(&act_mod_lock);
271 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
272 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
273 write_unlock(&act_mod_lock);
274 return -EEXIST;
275 }
276 }
277 act->next = NULL;
278 *ap = act;
279 write_unlock(&act_mod_lock);
280 return 0;
281}
282EXPORT_SYMBOL(tcf_register_action);
283
284int tcf_unregister_action(struct tc_action_ops *act)
285{
286 struct tc_action_ops *a, **ap;
287 int err = -ENOENT;
288
289 write_lock(&act_mod_lock);
290 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
291 if (a == act)
292 break;
293 if (a) {
294 *ap = a->next;
295 a->next = NULL;
296 err = 0;
297 }
298 write_unlock(&act_mod_lock);
299 return err;
300}
301EXPORT_SYMBOL(tcf_unregister_action);
302
303/* lookup by name */
304static struct tc_action_ops *tc_lookup_action_n(char *kind)
305{
306 struct tc_action_ops *a = NULL;
307
308 if (kind) {
309 read_lock(&act_mod_lock);
310 for (a = act_base; a; a = a->next) {
311 if (strcmp(kind, a->kind) == 0) {
312 if (!try_module_get(a->owner)) {
313 read_unlock(&act_mod_lock);
314 return NULL;
315 }
316 break;
317 }
318 }
319 read_unlock(&act_mod_lock);
320 }
321 return a;
322}
323
324/* lookup by nlattr */
325static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
326{
327 struct tc_action_ops *a = NULL;
328
329 if (kind) {
330 read_lock(&act_mod_lock);
331 for (a = act_base; a; a = a->next) {
332 if (nla_strcmp(kind, a->kind) == 0) {
333 if (!try_module_get(a->owner)) {
334 read_unlock(&act_mod_lock);
335 return NULL;
336 }
337 break;
338 }
339 }
340 read_unlock(&act_mod_lock);
341 }
342 return a;
343}
344
345#if 0
346/* lookup by id */
347static struct tc_action_ops *tc_lookup_action_id(u32 type)
348{
349 struct tc_action_ops *a = NULL;
350
351 if (type) {
352 read_lock(&act_mod_lock);
353 for (a = act_base; a; a = a->next) {
354 if (a->type == type) {
355 if (!try_module_get(a->owner)) {
356 read_unlock(&act_mod_lock);
357 return NULL;
358 }
359 break;
360 }
361 }
362 read_unlock(&act_mod_lock);
363 }
364 return a;
365}
366#endif
367
368int tcf_action_exec(struct sk_buff *skb, const struct tc_action *act,
369 struct tcf_result *res)
370{
371 const struct tc_action *a;
372 int ret = -1;
373
374 if (skb->tc_verd & TC_NCLS) {
375 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
376 ret = TC_ACT_OK;
377 goto exec_done;
378 }
379 while ((a = act) != NULL) {
380repeat:
381 if (a->ops && a->ops->act) {
382 ret = a->ops->act(skb, a, res);
383 if (TC_MUNGED & skb->tc_verd) {
384 /* copied already, allow trampling */
385 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
386 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
387 }
388 if (ret == TC_ACT_REPEAT)
389 goto repeat; /* we need a ttl - JHS */
390 if (ret != TC_ACT_PIPE)
391 goto exec_done;
392 }
393 act = a->next;
394 }
395exec_done:
396 return ret;
397}
398EXPORT_SYMBOL(tcf_action_exec);
399
400void tcf_action_destroy(struct tc_action *act, int bind)
401{
402 struct tc_action *a;
403
404 for (a = act; a; a = act) {
405 if (a->ops && a->ops->cleanup) {
406 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
407 module_put(a->ops->owner);
408 act = act->next;
409 kfree(a);
410 } else {
411 /*FIXME: Remove later - catch insertion bugs*/
412 WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n");
413 act = act->next;
414 kfree(a);
415 }
416 }
417}
418
419int
420tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
421{
422 int err = -EINVAL;
423
424 if (a->ops == NULL || a->ops->dump == NULL)
425 return err;
426 return a->ops->dump(skb, a, bind, ref);
427}
428
429int
430tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
431{
432 int err = -EINVAL;
433 unsigned char *b = skb_tail_pointer(skb);
434 struct nlattr *nest;
435
436 if (a->ops == NULL || a->ops->dump == NULL)
437 return err;
438
439 NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
440 if (tcf_action_copy_stats(skb, a, 0))
441 goto nla_put_failure;
442 nest = nla_nest_start(skb, TCA_OPTIONS);
443 if (nest == NULL)
444 goto nla_put_failure;
445 err = tcf_action_dump_old(skb, a, bind, ref);
446 if (err > 0) {
447 nla_nest_end(skb, nest);
448 return err;
449 }
450
451nla_put_failure:
452 nlmsg_trim(skb, b);
453 return -1;
454}
455EXPORT_SYMBOL(tcf_action_dump_1);
456
457int
458tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
459{
460 struct tc_action *a;
461 int err = -EINVAL;
462 struct nlattr *nest;
463
464 while ((a = act) != NULL) {
465 act = a->next;
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 nlattr *nla, struct nlattr *est,
485 char *name, int ovr, int bind)
486{
487 struct tc_action *a;
488 struct tc_action_ops *a_o;
489 char act_name[IFNAMSIZ];
490 struct nlattr *tb[TCA_ACT_MAX + 1];
491 struct nlattr *kind;
492 int err;
493
494 if (name == NULL) {
495 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
496 if (err < 0)
497 goto err_out;
498 err = -EINVAL;
499 kind = tb[TCA_ACT_KIND];
500 if (kind == NULL)
501 goto err_out;
502 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
503 goto err_out;
504 } else {
505 err = -EINVAL;
506 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
507 goto err_out;
508 }
509
510 a_o = tc_lookup_action_n(act_name);
511 if (a_o == NULL) {
512#ifdef CONFIG_MODULES
513 rtnl_unlock();
514 request_module("act_%s", act_name);
515 rtnl_lock();
516
517 a_o = tc_lookup_action_n(act_name);
518
519 /* We dropped the RTNL semaphore in order to
520 * perform the module load. So, even if we
521 * succeeded in loading the module we have to
522 * tell the caller to replay the request. We
523 * indicate this using -EAGAIN.
524 */
525 if (a_o != NULL) {
526 err = -EAGAIN;
527 goto err_mod;
528 }
529#endif
530 err = -ENOENT;
531 goto err_out;
532 }
533
534 err = -ENOMEM;
535 a = kzalloc(sizeof(*a), GFP_KERNEL);
536 if (a == NULL)
537 goto err_mod;
538
539 /* backward compatibility for policer */
540 if (name == NULL)
541 err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
542 else
543 err = a_o->init(nla, est, a, ovr, bind);
544 if (err < 0)
545 goto err_free;
546
547 /* module count goes up only when brand new policy is created
548 * if it exists and is only bound to in a_o->init() then
549 * ACT_P_CREATED is not returned (a zero is).
550 */
551 if (err != ACT_P_CREATED)
552 module_put(a_o->owner);
553 a->ops = a_o;
554
555 return a;
556
557err_free:
558 kfree(a);
559err_mod:
560 module_put(a_o->owner);
561err_out:
562 return ERR_PTR(err);
563}
564
565struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
566 char *name, int ovr, int bind)
567{
568 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
569 struct tc_action *head = NULL, *act, *act_prev = NULL;
570 int err;
571 int i;
572
573 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
574 if (err < 0)
575 return ERR_PTR(err);
576
577 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
578 act = tcf_action_init_1(tb[i], est, name, ovr, bind);
579 if (IS_ERR(act))
580 goto err;
581 act->order = i;
582
583 if (head == NULL)
584 head = act;
585 else
586 act_prev->next = act;
587 act_prev = act;
588 }
589 return head;
590
591err:
592 if (head != NULL)
593 tcf_action_destroy(head, bind);
594 return act;
595}
596
597int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
598 int compat_mode)
599{
600 int err = 0;
601 struct gnet_dump d;
602 struct tcf_act_hdr *h = a->priv;
603
604 if (h == NULL)
605 goto errout;
606
607 /* compat_mode being true specifies a call that is supposed
608 * to add additional backward compatibility statistic TLVs.
609 */
610 if (compat_mode) {
611 if (a->type == TCA_OLD_COMPAT)
612 err = gnet_stats_start_copy_compat(skb, 0,
613 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
614 else
615 return 0;
616 } else
617 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
618 &h->tcf_lock, &d);
619
620 if (err < 0)
621 goto errout;
622
623 if (a->ops != NULL && a->ops->get_stats != NULL)
624 if (a->ops->get_stats(skb, a) < 0)
625 goto errout;
626
627 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
628 gnet_stats_copy_rate_est(&d, &h->tcf_bstats,
629 &h->tcf_rate_est) < 0 ||
630 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
631 goto errout;
632
633 if (gnet_stats_finish_copy(&d) < 0)
634 goto errout;
635
636 return 0;
637
638errout:
639 return -1;
640}
641
642static int
643tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
644 u16 flags, int event, int bind, int ref)
645{
646 struct tcamsg *t;
647 struct nlmsghdr *nlh;
648 unsigned char *b = skb_tail_pointer(skb);
649 struct nlattr *nest;
650
651 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
652
653 t = NLMSG_DATA(nlh);
654 t->tca_family = AF_UNSPEC;
655 t->tca__pad1 = 0;
656 t->tca__pad2 = 0;
657
658 nest = nla_nest_start(skb, TCA_ACT_TAB);
659 if (nest == NULL)
660 goto nla_put_failure;
661
662 if (tcf_action_dump(skb, a, bind, ref) < 0)
663 goto nla_put_failure;
664
665 nla_nest_end(skb, nest);
666
667 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
668 return skb->len;
669
670nla_put_failure:
671nlmsg_failure:
672 nlmsg_trim(skb, b);
673 return -1;
674}
675
676static int
677act_get_notify(struct net *net, u32 pid, struct nlmsghdr *n,
678 struct tc_action *a, int event)
679{
680 struct sk_buff *skb;
681
682 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
683 if (!skb)
684 return -ENOBUFS;
685 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
686 kfree_skb(skb);
687 return -EINVAL;
688 }
689
690 return rtnl_unicast(skb, net, pid);
691}
692
693static struct tc_action *
694tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
695{
696 struct nlattr *tb[TCA_ACT_MAX + 1];
697 struct tc_action *a;
698 int index;
699 int err;
700
701 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
702 if (err < 0)
703 goto err_out;
704
705 err = -EINVAL;
706 if (tb[TCA_ACT_INDEX] == NULL ||
707 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
708 goto err_out;
709 index = nla_get_u32(tb[TCA_ACT_INDEX]);
710
711 err = -ENOMEM;
712 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
713 if (a == NULL)
714 goto err_out;
715
716 err = -EINVAL;
717 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
718 if (a->ops == NULL)
719 goto err_free;
720 if (a->ops->lookup == NULL)
721 goto err_mod;
722 err = -ENOENT;
723 if (a->ops->lookup(a, index) == 0)
724 goto err_mod;
725
726 module_put(a->ops->owner);
727 return a;
728
729err_mod:
730 module_put(a->ops->owner);
731err_free:
732 kfree(a);
733err_out:
734 return ERR_PTR(err);
735}
736
737static void cleanup_a(struct tc_action *act)
738{
739 struct tc_action *a;
740
741 for (a = act; a; a = act) {
742 act = a->next;
743 kfree(a);
744 }
745}
746
747static struct tc_action *create_a(int i)
748{
749 struct tc_action *act;
750
751 act = kzalloc(sizeof(*act), GFP_KERNEL);
752 if (act == NULL) {
753 pr_debug("create_a: failed to alloc!\n");
754 return NULL;
755 }
756 act->order = i;
757 return act;
758}
759
760static int tca_action_flush(struct net *net, struct nlattr *nla,
761 struct nlmsghdr *n, u32 pid)
762{
763 struct sk_buff *skb;
764 unsigned char *b;
765 struct nlmsghdr *nlh;
766 struct tcamsg *t;
767 struct netlink_callback dcb;
768 struct nlattr *nest;
769 struct nlattr *tb[TCA_ACT_MAX + 1];
770 struct nlattr *kind;
771 struct tc_action *a = create_a(0);
772 int err = -ENOMEM;
773
774 if (a == NULL) {
775 pr_debug("tca_action_flush: couldnt create tc_action\n");
776 return err;
777 }
778
779 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
780 if (!skb) {
781 pr_debug("tca_action_flush: failed skb alloc\n");
782 kfree(a);
783 return err;
784 }
785
786 b = skb_tail_pointer(skb);
787
788 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
789 if (err < 0)
790 goto err_out;
791
792 err = -EINVAL;
793 kind = tb[TCA_ACT_KIND];
794 a->ops = tc_lookup_action(kind);
795 if (a->ops == NULL)
796 goto err_out;
797
798 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
799 t = NLMSG_DATA(nlh);
800 t->tca_family = AF_UNSPEC;
801 t->tca__pad1 = 0;
802 t->tca__pad2 = 0;
803
804 nest = nla_nest_start(skb, TCA_ACT_TAB);
805 if (nest == NULL)
806 goto nla_put_failure;
807
808 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
809 if (err < 0)
810 goto nla_put_failure;
811 if (err == 0)
812 goto noflush_out;
813
814 nla_nest_end(skb, nest);
815
816 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
817 nlh->nlmsg_flags |= NLM_F_ROOT;
818 module_put(a->ops->owner);
819 kfree(a);
820 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC,
821 n->nlmsg_flags & NLM_F_ECHO);
822 if (err > 0)
823 return 0;
824
825 return err;
826
827nla_put_failure:
828nlmsg_failure:
829 module_put(a->ops->owner);
830err_out:
831noflush_out:
832 kfree_skb(skb);
833 kfree(a);
834 return err;
835}
836
837static int
838tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
839 u32 pid, int event)
840{
841 int i, ret;
842 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
843 struct tc_action *head = NULL, *act, *act_prev = NULL;
844
845 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
846 if (ret < 0)
847 return ret;
848
849 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
850 if (tb[1] != NULL)
851 return tca_action_flush(net, tb[1], n, pid);
852 else
853 return -EINVAL;
854 }
855
856 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
857 act = tcf_action_get_1(tb[i], n, pid);
858 if (IS_ERR(act)) {
859 ret = PTR_ERR(act);
860 goto err;
861 }
862 act->order = i;
863
864 if (head == NULL)
865 head = act;
866 else
867 act_prev->next = act;
868 act_prev = act;
869 }
870
871 if (event == RTM_GETACTION)
872 ret = act_get_notify(net, pid, n, head, event);
873 else { /* delete */
874 struct sk_buff *skb;
875
876 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
877 if (!skb) {
878 ret = -ENOBUFS;
879 goto err;
880 }
881
882 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
883 0, 1) <= 0) {
884 kfree_skb(skb);
885 ret = -EINVAL;
886 goto err;
887 }
888
889 /* now do the delete */
890 tcf_action_destroy(head, 0);
891 ret = rtnetlink_send(skb, net, pid, RTNLGRP_TC,
892 n->nlmsg_flags & NLM_F_ECHO);
893 if (ret > 0)
894 return 0;
895 return ret;
896 }
897err:
898 cleanup_a(head);
899 return ret;
900}
901
902static int tcf_add_notify(struct net *net, struct tc_action *a,
903 u32 pid, u32 seq, int event, u16 flags)
904{
905 struct tcamsg *t;
906 struct nlmsghdr *nlh;
907 struct sk_buff *skb;
908 struct nlattr *nest;
909 unsigned char *b;
910 int err = 0;
911
912 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
913 if (!skb)
914 return -ENOBUFS;
915
916 b = skb_tail_pointer(skb);
917
918 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
919 t = NLMSG_DATA(nlh);
920 t->tca_family = AF_UNSPEC;
921 t->tca__pad1 = 0;
922 t->tca__pad2 = 0;
923
924 nest = nla_nest_start(skb, TCA_ACT_TAB);
925 if (nest == NULL)
926 goto nla_put_failure;
927
928 if (tcf_action_dump(skb, a, 0, 0) < 0)
929 goto nla_put_failure;
930
931 nla_nest_end(skb, nest);
932
933 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
934 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
935
936 err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags & NLM_F_ECHO);
937 if (err > 0)
938 err = 0;
939 return err;
940
941nla_put_failure:
942nlmsg_failure:
943 kfree_skb(skb);
944 return -1;
945}
946
947
948static int
949tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
950 u32 pid, int ovr)
951{
952 int ret = 0;
953 struct tc_action *act;
954 struct tc_action *a;
955 u32 seq = n->nlmsg_seq;
956
957 act = tcf_action_init(nla, NULL, NULL, ovr, 0);
958 if (act == NULL)
959 goto done;
960 if (IS_ERR(act)) {
961 ret = PTR_ERR(act);
962 goto done;
963 }
964
965 /* dump then free all the actions after update; inserted policy
966 * stays intact
967 */
968 ret = tcf_add_notify(net, act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
969 for (a = act; a; a = act) {
970 act = a->next;
971 kfree(a);
972 }
973done:
974 return ret;
975}
976
977static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
978{
979 struct net *net = sock_net(skb->sk);
980 struct nlattr *tca[TCA_ACT_MAX + 1];
981 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
982 int ret = 0, ovr = 0;
983
984 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
985 if (ret < 0)
986 return ret;
987
988 if (tca[TCA_ACT_TAB] == NULL) {
989 pr_notice("tc_ctl_action: received NO action attribs\n");
990 return -EINVAL;
991 }
992
993 /* n->nlmsg_flags & NLM_F_CREATE */
994 switch (n->nlmsg_type) {
995 case RTM_NEWACTION:
996 /* we are going to assume all other flags
997 * imply create only if it doesn't exist
998 * Note that CREATE | EXCL implies that
999 * but since we want avoid ambiguity (eg when flags
1000 * is zero) then just set this
1001 */
1002 if (n->nlmsg_flags & NLM_F_REPLACE)
1003 ovr = 1;
1004replay:
1005 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, pid, ovr);
1006 if (ret == -EAGAIN)
1007 goto replay;
1008 break;
1009 case RTM_DELACTION:
1010 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1011 pid, RTM_DELACTION);
1012 break;
1013 case RTM_GETACTION:
1014 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1015 pid, RTM_GETACTION);
1016 break;
1017 default:
1018 BUG();
1019 }
1020
1021 return ret;
1022}
1023
1024static struct nlattr *
1025find_dump_kind(const struct nlmsghdr *n)
1026{
1027 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1028 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1029 struct nlattr *nla[TCAA_MAX + 1];
1030 struct nlattr *kind;
1031
1032 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1033 return NULL;
1034 tb1 = nla[TCA_ACT_TAB];
1035 if (tb1 == NULL)
1036 return NULL;
1037
1038 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1039 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1040 return NULL;
1041
1042 if (tb[1] == NULL)
1043 return NULL;
1044 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1045 nla_len(tb[1]), NULL) < 0)
1046 return NULL;
1047 kind = tb2[TCA_ACT_KIND];
1048
1049 return kind;
1050}
1051
1052static int
1053tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1054{
1055 struct nlmsghdr *nlh;
1056 unsigned char *b = skb_tail_pointer(skb);
1057 struct nlattr *nest;
1058 struct tc_action_ops *a_o;
1059 struct tc_action a;
1060 int ret = 0;
1061 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
1062 struct nlattr *kind = find_dump_kind(cb->nlh);
1063
1064 if (kind == NULL) {
1065 pr_info("tc_dump_action: action bad kind\n");
1066 return 0;
1067 }
1068
1069 a_o = tc_lookup_action(kind);
1070 if (a_o == NULL)
1071 return 0;
1072
1073 memset(&a, 0, sizeof(struct tc_action));
1074 a.ops = a_o;
1075
1076 if (a_o->walk == NULL) {
1077 WARN(1, "tc_dump_action: %s !capable of dumping table\n",
1078 a_o->kind);
1079 goto nla_put_failure;
1080 }
1081
1082 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
1083 cb->nlh->nlmsg_type, sizeof(*t));
1084 t = NLMSG_DATA(nlh);
1085 t->tca_family = AF_UNSPEC;
1086 t->tca__pad1 = 0;
1087 t->tca__pad2 = 0;
1088
1089 nest = nla_nest_start(skb, TCA_ACT_TAB);
1090 if (nest == NULL)
1091 goto nla_put_failure;
1092
1093 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1094 if (ret < 0)
1095 goto nla_put_failure;
1096
1097 if (ret > 0) {
1098 nla_nest_end(skb, nest);
1099 ret = skb->len;
1100 } else
1101 nla_nest_cancel(skb, nest);
1102
1103 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1104 if (NETLINK_CB(cb->skb).pid && ret)
1105 nlh->nlmsg_flags |= NLM_F_MULTI;
1106 module_put(a_o->owner);
1107 return skb->len;
1108
1109nla_put_failure:
1110nlmsg_failure:
1111 module_put(a_o->owner);
1112 nlmsg_trim(skb, b);
1113 return skb->len;
1114}
1115
1116static int __init tc_action_init(void)
1117{
1118 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1119 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1120 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1121 NULL);
1122
1123 return 0;
1124}
1125
1126subsys_initcall(tc_action_init);