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smsc95xx: check return value of smsc95xx_reset
[linux/fpc-iii.git] / net / sched / act_api.c
blob5b8f8b382a2e7aedc1ecc6f5ed999352ed59f52c
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
30 static void free_tcf(struct rcu_head *head)
31 {
32 struct tc_action *p = container_of(head, struct tc_action, tcfa_rcu);
33
34 free_percpu(p->cpu_bstats);
35 free_percpu(p->cpu_qstats);
36 kfree(p);
37 }
38
39 static void tcf_hash_destroy(struct tcf_hashinfo *hinfo, struct tc_action *p)
40 {
41 spin_lock_bh(&hinfo->lock);
42 hlist_del(&p->tcfa_head);
43 spin_unlock_bh(&hinfo->lock);
44 gen_kill_estimator(&p->tcfa_bstats,
45 &p->tcfa_rate_est);
46 /*
47 * gen_estimator est_timer() might access p->tcfa_lock
48 * or bstats, wait a RCU grace period before freeing p
49 */
50 call_rcu(&p->tcfa_rcu, free_tcf);
51 }
52
53 int __tcf_hash_release(struct tc_action *p, bool bind, bool strict)
54 {
55 int ret = 0;
56
57 if (p) {
58 if (bind)
59 p->tcfa_bindcnt--;
60 else if (strict && p->tcfa_bindcnt > 0)
61 return -EPERM;
62
63 p->tcfa_refcnt--;
64 if (p->tcfa_bindcnt <= 0 && p->tcfa_refcnt <= 0) {
65 if (p->ops->cleanup)
66 p->ops->cleanup(p, bind);
67 tcf_hash_destroy(p->hinfo, p);
68 ret = ACT_P_DELETED;
69 }
70 }
71
72 return ret;
73 }
74 EXPORT_SYMBOL(__tcf_hash_release);
75
76 static int tcf_dump_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb,
77 struct netlink_callback *cb)
78 {
79 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
80 struct nlattr *nest;
81
82 spin_lock_bh(&hinfo->lock);
83
84 s_i = cb->args[0];
85
86 for (i = 0; i < (hinfo->hmask + 1); i++) {
87 struct hlist_head *head;
88 struct tc_action *p;
89
90 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
91
92 hlist_for_each_entry_rcu(p, head, tcfa_head) {
93 index++;
94 if (index < s_i)
95 continue;
96
97 nest = nla_nest_start(skb, n_i);
98 if (nest == NULL) {
99 index--;
100 goto nla_put_failure;
101 }
102 err = tcf_action_dump_1(skb, p, 0, 0);
103 if (err < 0) {
104 index--;
105 nlmsg_trim(skb, nest);
106 goto done;
107 }
108 nla_nest_end(skb, nest);
109 n_i++;
110 if (n_i >= TCA_ACT_MAX_PRIO)
111 goto done;
112 }
113 }
114 done:
115 spin_unlock_bh(&hinfo->lock);
116 if (n_i)
117 cb->args[0] += n_i;
118 return n_i;
119
120 nla_put_failure:
121 nla_nest_cancel(skb, nest);
122 goto done;
123 }
124
125 static int tcf_del_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb,
126 const struct tc_action_ops *ops)
127 {
128 struct nlattr *nest;
129 int i = 0, n_i = 0;
130 int ret = -EINVAL;
131
132 nest = nla_nest_start(skb, 0);
133 if (nest == NULL)
134 goto nla_put_failure;
135 if (nla_put_string(skb, TCA_KIND, ops->kind))
136 goto nla_put_failure;
137 for (i = 0; i < (hinfo->hmask + 1); i++) {
138 struct hlist_head *head;
139 struct hlist_node *n;
140 struct tc_action *p;
141
142 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
143 hlist_for_each_entry_safe(p, n, head, tcfa_head) {
144 ret = __tcf_hash_release(p, false, true);
145 if (ret == ACT_P_DELETED) {
146 module_put(ops->owner);
147 n_i++;
148 } else if (ret < 0)
149 goto nla_put_failure;
150 }
151 }
152 if (nla_put_u32(skb, TCA_FCNT, n_i))
153 goto nla_put_failure;
154 nla_nest_end(skb, nest);
155
156 return n_i;
157 nla_put_failure:
158 nla_nest_cancel(skb, nest);
159 return ret;
160 }
161
162 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
163 struct netlink_callback *cb, int type,
164 const struct tc_action_ops *ops)
165 {
166 struct tcf_hashinfo *hinfo = tn->hinfo;
167
168 if (type == RTM_DELACTION) {
169 return tcf_del_walker(hinfo, skb, ops);
170 } else if (type == RTM_GETACTION) {
171 return tcf_dump_walker(hinfo, skb, cb);
172 } else {
173 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
174 return -EINVAL;
175 }
176 }
177 EXPORT_SYMBOL(tcf_generic_walker);
178
179 static struct tc_action *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
180 {
181 struct tc_action *p = NULL;
182 struct hlist_head *head;
183
184 spin_lock_bh(&hinfo->lock);
185 head = &hinfo->htab[tcf_hash(index, hinfo->hmask)];
186 hlist_for_each_entry_rcu(p, head, tcfa_head)
187 if (p->tcfa_index == index)
188 break;
189 spin_unlock_bh(&hinfo->lock);
190
191 return p;
192 }
193
194 u32 tcf_hash_new_index(struct tc_action_net *tn)
195 {
196 struct tcf_hashinfo *hinfo = tn->hinfo;
197 u32 val = hinfo->index;
198
199 do {
200 if (++val == 0)
201 val = 1;
202 } while (tcf_hash_lookup(val, hinfo));
203
204 hinfo->index = val;
205 return val;
206 }
207 EXPORT_SYMBOL(tcf_hash_new_index);
208
209 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
210 {
211 struct tcf_hashinfo *hinfo = tn->hinfo;
212 struct tc_action *p = tcf_hash_lookup(index, hinfo);
213
214 if (p) {
215 *a = p;
216 return 1;
217 }
218 return 0;
219 }
220 EXPORT_SYMBOL(tcf_hash_search);
221
222 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
223 int bind)
224 {
225 struct tcf_hashinfo *hinfo = tn->hinfo;
226 struct tc_action *p = NULL;
227
228 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
229 if (bind)
230 p->tcfa_bindcnt++;
231 p->tcfa_refcnt++;
232 *a = p;
233 return true;
234 }
235 return false;
236 }
237 EXPORT_SYMBOL(tcf_hash_check);
238
239 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est)
240 {
241 if (est)
242 gen_kill_estimator(&a->tcfa_bstats,
243 &a->tcfa_rate_est);
244 call_rcu(&a->tcfa_rcu, free_tcf);
245 }
246 EXPORT_SYMBOL(tcf_hash_cleanup);
247
248 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
249 struct tc_action **a, const struct tc_action_ops *ops,
250 int bind, bool cpustats)
251 {
252 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
253 struct tcf_hashinfo *hinfo = tn->hinfo;
254 int err = -ENOMEM;
255
256 if (unlikely(!p))
257 return -ENOMEM;
258 p->tcfa_refcnt = 1;
259 if (bind)
260 p->tcfa_bindcnt = 1;
261
262 if (cpustats) {
263 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
264 if (!p->cpu_bstats) {
265 err1:
266 kfree(p);
267 return err;
268 }
269 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
270 if (!p->cpu_qstats) {
271 err2:
272 free_percpu(p->cpu_bstats);
273 goto err1;
274 }
275 }
276 spin_lock_init(&p->tcfa_lock);
277 INIT_HLIST_NODE(&p->tcfa_head);
278 p->tcfa_index = index ? index : tcf_hash_new_index(tn);
279 p->tcfa_tm.install = jiffies;
280 p->tcfa_tm.lastuse = jiffies;
281 p->tcfa_tm.firstuse = 0;
282 if (est) {
283 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
284 &p->tcfa_rate_est,
285 &p->tcfa_lock, NULL, est);
286 if (err) {
287 free_percpu(p->cpu_qstats);
288 goto err2;
289 }
290 }
291
292 p->hinfo = hinfo;
293 p->ops = ops;
294 INIT_LIST_HEAD(&p->list);
295 *a = p;
296 return 0;
297 }
298 EXPORT_SYMBOL(tcf_hash_create);
299
300 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a)
301 {
302 struct tcf_hashinfo *hinfo = tn->hinfo;
303 unsigned int h = tcf_hash(a->tcfa_index, hinfo->hmask);
304
305 spin_lock_bh(&hinfo->lock);
306 hlist_add_head(&a->tcfa_head, &hinfo->htab[h]);
307 spin_unlock_bh(&hinfo->lock);
308 }
309 EXPORT_SYMBOL(tcf_hash_insert);
310
311 void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
312 struct tcf_hashinfo *hinfo)
313 {
314 int i;
315
316 for (i = 0; i < hinfo->hmask + 1; i++) {
317 struct tc_action *p;
318 struct hlist_node *n;
319
320 hlist_for_each_entry_safe(p, n, &hinfo->htab[i], tcfa_head) {
321 int ret;
322
323 ret = __tcf_hash_release(p, false, true);
324 if (ret == ACT_P_DELETED)
325 module_put(ops->owner);
326 else if (ret < 0)
327 return;
328 }
329 }
330 kfree(hinfo->htab);
331 }
332 EXPORT_SYMBOL(tcf_hashinfo_destroy);
333
334 static LIST_HEAD(act_base);
335 static DEFINE_RWLOCK(act_mod_lock);
336
337 int tcf_register_action(struct tc_action_ops *act,
338 struct pernet_operations *ops)
339 {
340 struct tc_action_ops *a;
341 int ret;
342
343 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
344 return -EINVAL;
345
346 /* We have to register pernet ops before making the action ops visible,
347 * otherwise tcf_action_init_1() could get a partially initialized
348 * netns.
349 */
350 ret = register_pernet_subsys(ops);
351 if (ret)
352 return ret;
353
354 write_lock(&act_mod_lock);
355 list_for_each_entry(a, &act_base, head) {
356 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
357 write_unlock(&act_mod_lock);
358 unregister_pernet_subsys(ops);
359 return -EEXIST;
360 }
361 }
362 list_add_tail(&act->head, &act_base);
363 write_unlock(&act_mod_lock);
364
365 return 0;
366 }
367 EXPORT_SYMBOL(tcf_register_action);
368
369 int tcf_unregister_action(struct tc_action_ops *act,
370 struct pernet_operations *ops)
371 {
372 struct tc_action_ops *a;
373 int err = -ENOENT;
374
375 write_lock(&act_mod_lock);
376 list_for_each_entry(a, &act_base, head) {
377 if (a == act) {
378 list_del(&act->head);
379 err = 0;
380 break;
381 }
382 }
383 write_unlock(&act_mod_lock);
384 if (!err)
385 unregister_pernet_subsys(ops);
386 return err;
387 }
388 EXPORT_SYMBOL(tcf_unregister_action);
389
390 /* lookup by name */
391 static struct tc_action_ops *tc_lookup_action_n(char *kind)
392 {
393 struct tc_action_ops *a, *res = NULL;
394
395 if (kind) {
396 read_lock(&act_mod_lock);
397 list_for_each_entry(a, &act_base, head) {
398 if (strcmp(kind, a->kind) == 0) {
399 if (try_module_get(a->owner))
400 res = a;
401 break;
402 }
403 }
404 read_unlock(&act_mod_lock);
405 }
406 return res;
407 }
408
409 /* lookup by nlattr */
410 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
411 {
412 struct tc_action_ops *a, *res = NULL;
413
414 if (kind) {
415 read_lock(&act_mod_lock);
416 list_for_each_entry(a, &act_base, head) {
417 if (nla_strcmp(kind, a->kind) == 0) {
418 if (try_module_get(a->owner))
419 res = a;
420 break;
421 }
422 }
423 read_unlock(&act_mod_lock);
424 }
425 return res;
426 }
427
428 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
429 int nr_actions, struct tcf_result *res)
430 {
431 int ret = -1, i;
432
433 if (skb->tc_verd & TC_NCLS) {
434 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
435 ret = TC_ACT_OK;
436 goto exec_done;
437 }
438 for (i = 0; i < nr_actions; i++) {
439 const struct tc_action *a = actions[i];
440
441 repeat:
442 ret = a->ops->act(skb, a, res);
443 if (ret == TC_ACT_REPEAT)
444 goto repeat; /* we need a ttl - JHS */
445 if (ret != TC_ACT_PIPE)
446 goto exec_done;
447 }
448 exec_done:
449 return ret;
450 }
451 EXPORT_SYMBOL(tcf_action_exec);
452
453 int tcf_action_destroy(struct list_head *actions, int bind)
454 {
455 const struct tc_action_ops *ops;
456 struct tc_action *a, *tmp;
457 int ret = 0;
458
459 list_for_each_entry_safe(a, tmp, actions, list) {
460 ops = a->ops;
461 ret = __tcf_hash_release(a, bind, true);
462 if (ret == ACT_P_DELETED)
463 module_put(ops->owner);
464 else if (ret < 0)
465 return ret;
466 }
467 return ret;
468 }
469
470 int
471 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
472 {
473 return a->ops->dump(skb, a, bind, ref);
474 }
475
476 int
477 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
478 {
479 int err = -EINVAL;
480 unsigned char *b = skb_tail_pointer(skb);
481 struct nlattr *nest;
482
483 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
484 goto nla_put_failure;
485 if (tcf_action_copy_stats(skb, a, 0))
486 goto nla_put_failure;
487 nest = nla_nest_start(skb, TCA_OPTIONS);
488 if (nest == NULL)
489 goto nla_put_failure;
490 err = tcf_action_dump_old(skb, a, bind, ref);
491 if (err > 0) {
492 nla_nest_end(skb, nest);
493 return err;
494 }
495
496 nla_put_failure:
497 nlmsg_trim(skb, b);
498 return -1;
499 }
500 EXPORT_SYMBOL(tcf_action_dump_1);
501
502 int tcf_action_dump(struct sk_buff *skb, struct list_head *actions,
503 int bind, int ref)
504 {
505 struct tc_action *a;
506 int err = -EINVAL;
507 struct nlattr *nest;
508
509 list_for_each_entry(a, actions, list) {
510 nest = nla_nest_start(skb, a->order);
511 if (nest == NULL)
512 goto nla_put_failure;
513 err = tcf_action_dump_1(skb, a, bind, ref);
514 if (err < 0)
515 goto errout;
516 nla_nest_end(skb, nest);
517 }
518
519 return 0;
520
521 nla_put_failure:
522 err = -EINVAL;
523 errout:
524 nla_nest_cancel(skb, nest);
525 return err;
526 }
527
528 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
529 struct nlattr *est, char *name, int ovr,
530 int bind)
531 {
532 struct tc_action *a;
533 struct tc_action_ops *a_o;
534 char act_name[IFNAMSIZ];
535 struct nlattr *tb[TCA_ACT_MAX + 1];
536 struct nlattr *kind;
537 int err;
538
539 if (name == NULL) {
540 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
541 if (err < 0)
542 goto err_out;
543 err = -EINVAL;
544 kind = tb[TCA_ACT_KIND];
545 if (kind == NULL)
546 goto err_out;
547 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
548 goto err_out;
549 } else {
550 err = -EINVAL;
551 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
552 goto err_out;
553 }
554
555 a_o = tc_lookup_action_n(act_name);
556 if (a_o == NULL) {
557 #ifdef CONFIG_MODULES
558 rtnl_unlock();
559 request_module("act_%s", act_name);
560 rtnl_lock();
561
562 a_o = tc_lookup_action_n(act_name);
563
564 /* We dropped the RTNL semaphore in order to
565 * perform the module load. So, even if we
566 * succeeded in loading the module we have to
567 * tell the caller to replay the request. We
568 * indicate this using -EAGAIN.
569 */
570 if (a_o != NULL) {
571 err = -EAGAIN;
572 goto err_mod;
573 }
574 #endif
575 err = -ENOENT;
576 goto err_out;
577 }
578
579 /* backward compatibility for policer */
580 if (name == NULL)
581 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind);
582 else
583 err = a_o->init(net, nla, est, &a, ovr, bind);
584 if (err < 0)
585 goto err_mod;
586
587 /* module count goes up only when brand new policy is created
588 * if it exists and is only bound to in a_o->init() then
589 * ACT_P_CREATED is not returned (a zero is).
590 */
591 if (err != ACT_P_CREATED)
592 module_put(a_o->owner);
593
594 return a;
595
596 err_mod:
597 module_put(a_o->owner);
598 err_out:
599 return ERR_PTR(err);
600 }
601
602 static void cleanup_a(struct list_head *actions, int ovr)
603 {
604 struct tc_action *a;
605
606 if (!ovr)
607 return;
608
609 list_for_each_entry(a, actions, list)
610 a->tcfa_refcnt--;
611 }
612
613 int tcf_action_init(struct net *net, struct nlattr *nla, struct nlattr *est,
614 char *name, int ovr, int bind, struct list_head *actions)
615 {
616 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
617 struct tc_action *act;
618 int err;
619 int i;
620
621 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
622 if (err < 0)
623 return err;
624
625 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
626 act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
627 if (IS_ERR(act)) {
628 err = PTR_ERR(act);
629 goto err;
630 }
631 act->order = i;
632 if (ovr)
633 act->tcfa_refcnt++;
634 list_add_tail(&act->list, actions);
635 }
636
637 /* Remove the temp refcnt which was necessary to protect against
638 * destroying an existing action which was being replaced
639 */
640 cleanup_a(actions, ovr);
641 return 0;
642
643 err:
644 tcf_action_destroy(actions, bind);
645 return err;
646 }
647
648 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
649 int compat_mode)
650 {
651 int err = 0;
652 struct gnet_dump d;
653
654 if (p == NULL)
655 goto errout;
656
657 /* compat_mode being true specifies a call that is supposed
658 * to add additional backward compatibility statistic TLVs.
659 */
660 if (compat_mode) {
661 if (p->type == TCA_OLD_COMPAT)
662 err = gnet_stats_start_copy_compat(skb, 0,
663 TCA_STATS,
664 TCA_XSTATS,
665 &p->tcfa_lock, &d,
666 TCA_PAD);
667 else
668 return 0;
669 } else
670 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
671 &p->tcfa_lock, &d, TCA_ACT_PAD);
672
673 if (err < 0)
674 goto errout;
675
676 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
677 gnet_stats_copy_rate_est(&d, &p->tcfa_bstats,
678 &p->tcfa_rate_est) < 0 ||
679 gnet_stats_copy_queue(&d, p->cpu_qstats,
680 &p->tcfa_qstats,
681 p->tcfa_qstats.qlen) < 0)
682 goto errout;
683
684 if (gnet_stats_finish_copy(&d) < 0)
685 goto errout;
686
687 return 0;
688
689 errout:
690 return -1;
691 }
692
693 static int tca_get_fill(struct sk_buff *skb, struct list_head *actions,
694 u32 portid, u32 seq, u16 flags, int event, int bind,
695 int ref)
696 {
697 struct tcamsg *t;
698 struct nlmsghdr *nlh;
699 unsigned char *b = skb_tail_pointer(skb);
700 struct nlattr *nest;
701
702 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
703 if (!nlh)
704 goto out_nlmsg_trim;
705 t = nlmsg_data(nlh);
706 t->tca_family = AF_UNSPEC;
707 t->tca__pad1 = 0;
708 t->tca__pad2 = 0;
709
710 nest = nla_nest_start(skb, TCA_ACT_TAB);
711 if (nest == NULL)
712 goto out_nlmsg_trim;
713
714 if (tcf_action_dump(skb, actions, bind, ref) < 0)
715 goto out_nlmsg_trim;
716
717 nla_nest_end(skb, nest);
718
719 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
720 return skb->len;
721
722 out_nlmsg_trim:
723 nlmsg_trim(skb, b);
724 return -1;
725 }
726
727 static int
728 act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
729 struct list_head *actions, int event)
730 {
731 struct sk_buff *skb;
732
733 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
734 if (!skb)
735 return -ENOBUFS;
736 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
737 0, 0) <= 0) {
738 kfree_skb(skb);
739 return -EINVAL;
740 }
741
742 return rtnl_unicast(skb, net, portid);
743 }
744
745 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
746 struct nlmsghdr *n, u32 portid)
747 {
748 struct nlattr *tb[TCA_ACT_MAX + 1];
749 const struct tc_action_ops *ops;
750 struct tc_action *a;
751 int index;
752 int err;
753
754 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
755 if (err < 0)
756 goto err_out;
757
758 err = -EINVAL;
759 if (tb[TCA_ACT_INDEX] == NULL ||
760 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
761 goto err_out;
762 index = nla_get_u32(tb[TCA_ACT_INDEX]);
763
764 err = -EINVAL;
765 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
766 if (!ops) /* could happen in batch of actions */
767 goto err_out;
768 err = -ENOENT;
769 if (ops->lookup(net, &a, index) == 0)
770 goto err_mod;
771
772 module_put(ops->owner);
773 return a;
774
775 err_mod:
776 module_put(ops->owner);
777 err_out:
778 return ERR_PTR(err);
779 }
780
781 static int tca_action_flush(struct net *net, struct nlattr *nla,
782 struct nlmsghdr *n, u32 portid)
783 {
784 struct sk_buff *skb;
785 unsigned char *b;
786 struct nlmsghdr *nlh;
787 struct tcamsg *t;
788 struct netlink_callback dcb;
789 struct nlattr *nest;
790 struct nlattr *tb[TCA_ACT_MAX + 1];
791 const struct tc_action_ops *ops;
792 struct nlattr *kind;
793 int err = -ENOMEM;
794
795 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
796 if (!skb) {
797 pr_debug("tca_action_flush: failed skb alloc\n");
798 return err;
799 }
800
801 b = skb_tail_pointer(skb);
802
803 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
804 if (err < 0)
805 goto err_out;
806
807 err = -EINVAL;
808 kind = tb[TCA_ACT_KIND];
809 ops = tc_lookup_action(kind);
810 if (!ops) /*some idjot trying to flush unknown action */
811 goto err_out;
812
813 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
814 sizeof(*t), 0);
815 if (!nlh)
816 goto out_module_put;
817 t = nlmsg_data(nlh);
818 t->tca_family = AF_UNSPEC;
819 t->tca__pad1 = 0;
820 t->tca__pad2 = 0;
821
822 nest = nla_nest_start(skb, TCA_ACT_TAB);
823 if (nest == NULL)
824 goto out_module_put;
825
826 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops);
827 if (err <= 0)
828 goto out_module_put;
829
830 nla_nest_end(skb, nest);
831
832 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
833 nlh->nlmsg_flags |= NLM_F_ROOT;
834 module_put(ops->owner);
835 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
836 n->nlmsg_flags & NLM_F_ECHO);
837 if (err > 0)
838 return 0;
839
840 return err;
841
842 out_module_put:
843 module_put(ops->owner);
844 err_out:
845 kfree_skb(skb);
846 return err;
847 }
848
849 static int
850 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
851 u32 portid)
852 {
853 int ret;
854 struct sk_buff *skb;
855
856 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
857 if (!skb)
858 return -ENOBUFS;
859
860 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
861 0, 1) <= 0) {
862 kfree_skb(skb);
863 return -EINVAL;
864 }
865
866 /* now do the delete */
867 ret = tcf_action_destroy(actions, 0);
868 if (ret < 0) {
869 kfree_skb(skb);
870 return ret;
871 }
872
873 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
874 n->nlmsg_flags & NLM_F_ECHO);
875 if (ret > 0)
876 return 0;
877 return ret;
878 }
879
880 static int
881 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
882 u32 portid, int event)
883 {
884 int i, ret;
885 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
886 struct tc_action *act;
887 LIST_HEAD(actions);
888
889 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
890 if (ret < 0)
891 return ret;
892
893 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
894 if (tb[1] != NULL)
895 return tca_action_flush(net, tb[1], n, portid);
896 else
897 return -EINVAL;
898 }
899
900 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
901 act = tcf_action_get_1(net, tb[i], n, portid);
902 if (IS_ERR(act)) {
903 ret = PTR_ERR(act);
904 goto err;
905 }
906 act->order = i;
907 list_add_tail(&act->list, &actions);
908 }
909
910 if (event == RTM_GETACTION)
911 ret = act_get_notify(net, portid, n, &actions, event);
912 else { /* delete */
913 ret = tcf_del_notify(net, n, &actions, portid);
914 if (ret)
915 goto err;
916 return ret;
917 }
918 err:
919 if (event != RTM_GETACTION)
920 tcf_action_destroy(&actions, 0);
921 return ret;
922 }
923
924 static int
925 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
926 u32 portid)
927 {
928 struct sk_buff *skb;
929 int err = 0;
930
931 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
932 if (!skb)
933 return -ENOBUFS;
934
935 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
936 RTM_NEWACTION, 0, 0) <= 0) {
937 kfree_skb(skb);
938 return -EINVAL;
939 }
940
941 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
942 n->nlmsg_flags & NLM_F_ECHO);
943 if (err > 0)
944 err = 0;
945 return err;
946 }
947
948 static int tcf_action_add(struct net *net, struct nlattr *nla,
949 struct nlmsghdr *n, u32 portid, int ovr)
950 {
951 int loop, ret;
952 LIST_HEAD(actions);
953
954 for (loop = 0; loop < 10; loop++) {
955 ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions);
956 if (ret != -EAGAIN)
957 break;
958 }
959
960 if (ret)
961 return ret;
962
963 return tcf_add_notify(net, n, &actions, portid);
964 }
965
966 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
967 {
968 struct net *net = sock_net(skb->sk);
969 struct nlattr *tca[TCA_ACT_MAX + 1];
970 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
971 int ret = 0, ovr = 0;
972
973 if ((n->nlmsg_type != RTM_GETACTION) &&
974 !netlink_capable(skb, CAP_NET_ADMIN))
975 return -EPERM;
976
977 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
978 if (ret < 0)
979 return ret;
980
981 if (tca[TCA_ACT_TAB] == NULL) {
982 pr_notice("tc_ctl_action: received NO action attribs\n");
983 return -EINVAL;
984 }
985
986 /* n->nlmsg_flags & NLM_F_CREATE */
987 switch (n->nlmsg_type) {
988 case RTM_NEWACTION:
989 /* we are going to assume all other flags
990 * imply create only if it doesn't exist
991 * Note that CREATE | EXCL implies that
992 * but since we want avoid ambiguity (eg when flags
993 * is zero) then just set this
994 */
995 if (n->nlmsg_flags & NLM_F_REPLACE)
996 ovr = 1;
997 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
998 break;
999 case RTM_DELACTION:
1000 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1001 portid, RTM_DELACTION);
1002 break;
1003 case RTM_GETACTION:
1004 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1005 portid, RTM_GETACTION);
1006 break;
1007 default:
1008 BUG();
1009 }
1010
1011 return ret;
1012 }
1013
1014 static struct nlattr *find_dump_kind(const struct nlmsghdr *n)
1015 {
1016 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1017 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1018 struct nlattr *nla[TCAA_MAX + 1];
1019 struct nlattr *kind;
1020
1021 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1022 return NULL;
1023 tb1 = nla[TCA_ACT_TAB];
1024 if (tb1 == NULL)
1025 return NULL;
1026
1027 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1028 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1029 return NULL;
1030
1031 if (tb[1] == NULL)
1032 return NULL;
1033 if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL) < 0)
1034 return NULL;
1035 kind = tb2[TCA_ACT_KIND];
1036
1037 return kind;
1038 }
1039
1040 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1041 {
1042 struct net *net = sock_net(skb->sk);
1043 struct nlmsghdr *nlh;
1044 unsigned char *b = skb_tail_pointer(skb);
1045 struct nlattr *nest;
1046 struct tc_action_ops *a_o;
1047 int ret = 0;
1048 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1049 struct nlattr *kind = find_dump_kind(cb->nlh);
1050
1051 if (kind == NULL) {
1052 pr_info("tc_dump_action: action bad kind\n");
1053 return 0;
1054 }
1055
1056 a_o = tc_lookup_action(kind);
1057 if (a_o == NULL)
1058 return 0;
1059
1060 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1061 cb->nlh->nlmsg_type, sizeof(*t), 0);
1062 if (!nlh)
1063 goto out_module_put;
1064 t = nlmsg_data(nlh);
1065 t->tca_family = AF_UNSPEC;
1066 t->tca__pad1 = 0;
1067 t->tca__pad2 = 0;
1068
1069 nest = nla_nest_start(skb, TCA_ACT_TAB);
1070 if (nest == NULL)
1071 goto out_module_put;
1072
1073 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o);
1074 if (ret < 0)
1075 goto out_module_put;
1076
1077 if (ret > 0) {
1078 nla_nest_end(skb, nest);
1079 ret = skb->len;
1080 } else
1081 nlmsg_trim(skb, b);
1082
1083 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1084 if (NETLINK_CB(cb->skb).portid && ret)
1085 nlh->nlmsg_flags |= NLM_F_MULTI;
1086 module_put(a_o->owner);
1087 return skb->len;
1088
1089 out_module_put:
1090 module_put(a_o->owner);
1091 nlmsg_trim(skb, b);
1092 return skb->len;
1093 }
1094
1095 static int __init tc_action_init(void)
1096 {
1097 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1098 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1099 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1100 NULL);
1101
1102 return 0;
1103 }
1104
1105 subsys_initcall(tc_action_init);
Linux with added FPC-III support