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drm/fb-helper: Keep references for the current set of used connectors
[linux/fpc-iii.git] / net / sched / act_api.c
blobd09d0687594b0b5ae04ad54a2b937044522bfbea
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 goto nla_put_failure;
100 err = tcf_action_dump_1(skb, p, 0, 0);
101 if (err < 0) {
102 index--;
103 nlmsg_trim(skb, nest);
104 goto done;
105 }
106 nla_nest_end(skb, nest);
107 n_i++;
108 if (n_i >= TCA_ACT_MAX_PRIO)
109 goto done;
110 }
111 }
112 done:
113 spin_unlock_bh(&hinfo->lock);
114 if (n_i)
115 cb->args[0] += n_i;
116 return n_i;
117
118 nla_put_failure:
119 nla_nest_cancel(skb, nest);
120 goto done;
121 }
122
123 static int tcf_del_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb,
124 const struct tc_action_ops *ops)
125 {
126 struct nlattr *nest;
127 int i = 0, n_i = 0;
128 int ret = -EINVAL;
129
130 nest = nla_nest_start(skb, 0);
131 if (nest == NULL)
132 goto nla_put_failure;
133 if (nla_put_string(skb, TCA_KIND, ops->kind))
134 goto nla_put_failure;
135 for (i = 0; i < (hinfo->hmask + 1); i++) {
136 struct hlist_head *head;
137 struct hlist_node *n;
138 struct tc_action *p;
139
140 head = &hinfo->htab[tcf_hash(i, hinfo->hmask)];
141 hlist_for_each_entry_safe(p, n, head, tcfa_head) {
142 ret = __tcf_hash_release(p, false, true);
143 if (ret == ACT_P_DELETED) {
144 module_put(p->ops->owner);
145 n_i++;
146 } else if (ret < 0)
147 goto nla_put_failure;
148 }
149 }
150 if (nla_put_u32(skb, TCA_FCNT, n_i))
151 goto nla_put_failure;
152 nla_nest_end(skb, nest);
153
154 return n_i;
155 nla_put_failure:
156 nla_nest_cancel(skb, nest);
157 return ret;
158 }
159
160 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
161 struct netlink_callback *cb, int type,
162 const struct tc_action_ops *ops)
163 {
164 struct tcf_hashinfo *hinfo = tn->hinfo;
165
166 if (type == RTM_DELACTION) {
167 return tcf_del_walker(hinfo, skb, ops);
168 } else if (type == RTM_GETACTION) {
169 return tcf_dump_walker(hinfo, skb, cb);
170 } else {
171 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
172 return -EINVAL;
173 }
174 }
175 EXPORT_SYMBOL(tcf_generic_walker);
176
177 static struct tc_action *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
178 {
179 struct tc_action *p = NULL;
180 struct hlist_head *head;
181
182 spin_lock_bh(&hinfo->lock);
183 head = &hinfo->htab[tcf_hash(index, hinfo->hmask)];
184 hlist_for_each_entry_rcu(p, head, tcfa_head)
185 if (p->tcfa_index == index)
186 break;
187 spin_unlock_bh(&hinfo->lock);
188
189 return p;
190 }
191
192 u32 tcf_hash_new_index(struct tc_action_net *tn)
193 {
194 struct tcf_hashinfo *hinfo = tn->hinfo;
195 u32 val = hinfo->index;
196
197 do {
198 if (++val == 0)
199 val = 1;
200 } while (tcf_hash_lookup(val, hinfo));
201
202 hinfo->index = val;
203 return val;
204 }
205 EXPORT_SYMBOL(tcf_hash_new_index);
206
207 int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
208 {
209 struct tcf_hashinfo *hinfo = tn->hinfo;
210 struct tc_action *p = tcf_hash_lookup(index, hinfo);
211
212 if (p) {
213 *a = p;
214 return 1;
215 }
216 return 0;
217 }
218 EXPORT_SYMBOL(tcf_hash_search);
219
220 bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
221 int bind)
222 {
223 struct tcf_hashinfo *hinfo = tn->hinfo;
224 struct tc_action *p = NULL;
225
226 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
227 if (bind)
228 p->tcfa_bindcnt++;
229 p->tcfa_refcnt++;
230 *a = p;
231 return true;
232 }
233 return false;
234 }
235 EXPORT_SYMBOL(tcf_hash_check);
236
237 void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est)
238 {
239 if (est)
240 gen_kill_estimator(&a->tcfa_bstats,
241 &a->tcfa_rate_est);
242 call_rcu(&a->tcfa_rcu, free_tcf);
243 }
244 EXPORT_SYMBOL(tcf_hash_cleanup);
245
246 int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
247 struct tc_action **a, const struct tc_action_ops *ops,
248 int bind, bool cpustats)
249 {
250 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
251 struct tcf_hashinfo *hinfo = tn->hinfo;
252 int err = -ENOMEM;
253
254 if (unlikely(!p))
255 return -ENOMEM;
256 p->tcfa_refcnt = 1;
257 if (bind)
258 p->tcfa_bindcnt = 1;
259
260 if (cpustats) {
261 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
262 if (!p->cpu_bstats) {
263 err1:
264 kfree(p);
265 return err;
266 }
267 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
268 if (!p->cpu_qstats) {
269 err2:
270 free_percpu(p->cpu_bstats);
271 goto err1;
272 }
273 }
274 spin_lock_init(&p->tcfa_lock);
275 INIT_HLIST_NODE(&p->tcfa_head);
276 p->tcfa_index = index ? index : tcf_hash_new_index(tn);
277 p->tcfa_tm.install = jiffies;
278 p->tcfa_tm.lastuse = jiffies;
279 p->tcfa_tm.firstuse = 0;
280 if (est) {
281 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
282 &p->tcfa_rate_est,
283 &p->tcfa_lock, NULL, est);
284 if (err) {
285 free_percpu(p->cpu_qstats);
286 goto err2;
287 }
288 }
289
290 p->hinfo = hinfo;
291 p->ops = ops;
292 INIT_LIST_HEAD(&p->list);
293 *a = p;
294 return 0;
295 }
296 EXPORT_SYMBOL(tcf_hash_create);
297
298 void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a)
299 {
300 struct tcf_hashinfo *hinfo = tn->hinfo;
301 unsigned int h = tcf_hash(a->tcfa_index, hinfo->hmask);
302
303 spin_lock_bh(&hinfo->lock);
304 hlist_add_head(&a->tcfa_head, &hinfo->htab[h]);
305 spin_unlock_bh(&hinfo->lock);
306 }
307 EXPORT_SYMBOL(tcf_hash_insert);
308
309 void tcf_hashinfo_destroy(const struct tc_action_ops *ops,
310 struct tcf_hashinfo *hinfo)
311 {
312 int i;
313
314 for (i = 0; i < hinfo->hmask + 1; i++) {
315 struct tc_action *p;
316 struct hlist_node *n;
317
318 hlist_for_each_entry_safe(p, n, &hinfo->htab[i], tcfa_head) {
319 int ret;
320
321 ret = __tcf_hash_release(p, false, true);
322 if (ret == ACT_P_DELETED)
323 module_put(ops->owner);
324 else if (ret < 0)
325 return;
326 }
327 }
328 kfree(hinfo->htab);
329 }
330 EXPORT_SYMBOL(tcf_hashinfo_destroy);
331
332 static LIST_HEAD(act_base);
333 static DEFINE_RWLOCK(act_mod_lock);
334
335 int tcf_register_action(struct tc_action_ops *act,
336 struct pernet_operations *ops)
337 {
338 struct tc_action_ops *a;
339 int ret;
340
341 if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup)
342 return -EINVAL;
343
344 write_lock(&act_mod_lock);
345 list_for_each_entry(a, &act_base, head) {
346 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
347 write_unlock(&act_mod_lock);
348 return -EEXIST;
349 }
350 }
351 list_add_tail(&act->head, &act_base);
352 write_unlock(&act_mod_lock);
353
354 ret = register_pernet_subsys(ops);
355 if (ret) {
356 tcf_unregister_action(act, ops);
357 return ret;
358 }
359
360 return 0;
361 }
362 EXPORT_SYMBOL(tcf_register_action);
363
364 int tcf_unregister_action(struct tc_action_ops *act,
365 struct pernet_operations *ops)
366 {
367 struct tc_action_ops *a;
368 int err = -ENOENT;
369
370 unregister_pernet_subsys(ops);
371
372 write_lock(&act_mod_lock);
373 list_for_each_entry(a, &act_base, head) {
374 if (a == act) {
375 list_del(&act->head);
376 err = 0;
377 break;
378 }
379 }
380 write_unlock(&act_mod_lock);
381 return err;
382 }
383 EXPORT_SYMBOL(tcf_unregister_action);
384
385 /* lookup by name */
386 static struct tc_action_ops *tc_lookup_action_n(char *kind)
387 {
388 struct tc_action_ops *a, *res = NULL;
389
390 if (kind) {
391 read_lock(&act_mod_lock);
392 list_for_each_entry(a, &act_base, head) {
393 if (strcmp(kind, a->kind) == 0) {
394 if (try_module_get(a->owner))
395 res = a;
396 break;
397 }
398 }
399 read_unlock(&act_mod_lock);
400 }
401 return res;
402 }
403
404 /* lookup by nlattr */
405 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
406 {
407 struct tc_action_ops *a, *res = NULL;
408
409 if (kind) {
410 read_lock(&act_mod_lock);
411 list_for_each_entry(a, &act_base, head) {
412 if (nla_strcmp(kind, a->kind) == 0) {
413 if (try_module_get(a->owner))
414 res = a;
415 break;
416 }
417 }
418 read_unlock(&act_mod_lock);
419 }
420 return res;
421 }
422
423 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
424 int nr_actions, struct tcf_result *res)
425 {
426 int ret = -1, i;
427
428 if (skb->tc_verd & TC_NCLS) {
429 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
430 ret = TC_ACT_OK;
431 goto exec_done;
432 }
433 for (i = 0; i < nr_actions; i++) {
434 const struct tc_action *a = actions[i];
435
436 repeat:
437 ret = a->ops->act(skb, a, res);
438 if (ret == TC_ACT_REPEAT)
439 goto repeat; /* we need a ttl - JHS */
440 if (ret != TC_ACT_PIPE)
441 goto exec_done;
442 }
443 exec_done:
444 return ret;
445 }
446 EXPORT_SYMBOL(tcf_action_exec);
447
448 int tcf_action_destroy(struct list_head *actions, int bind)
449 {
450 struct tc_action *a, *tmp;
451 int ret = 0;
452
453 list_for_each_entry_safe(a, tmp, actions, list) {
454 ret = __tcf_hash_release(a, bind, true);
455 if (ret == ACT_P_DELETED)
456 module_put(a->ops->owner);
457 else if (ret < 0)
458 return ret;
459 }
460 return ret;
461 }
462
463 int
464 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
465 {
466 return a->ops->dump(skb, a, bind, ref);
467 }
468
469 int
470 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
471 {
472 int err = -EINVAL;
473 unsigned char *b = skb_tail_pointer(skb);
474 struct nlattr *nest;
475
476 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
477 goto nla_put_failure;
478 if (tcf_action_copy_stats(skb, a, 0))
479 goto nla_put_failure;
480 nest = nla_nest_start(skb, TCA_OPTIONS);
481 if (nest == NULL)
482 goto nla_put_failure;
483 err = tcf_action_dump_old(skb, a, bind, ref);
484 if (err > 0) {
485 nla_nest_end(skb, nest);
486 return err;
487 }
488
489 nla_put_failure:
490 nlmsg_trim(skb, b);
491 return -1;
492 }
493 EXPORT_SYMBOL(tcf_action_dump_1);
494
495 int tcf_action_dump(struct sk_buff *skb, struct list_head *actions,
496 int bind, int ref)
497 {
498 struct tc_action *a;
499 int err = -EINVAL;
500 struct nlattr *nest;
501
502 list_for_each_entry(a, actions, list) {
503 nest = nla_nest_start(skb, a->order);
504 if (nest == NULL)
505 goto nla_put_failure;
506 err = tcf_action_dump_1(skb, a, bind, ref);
507 if (err < 0)
508 goto errout;
509 nla_nest_end(skb, nest);
510 }
511
512 return 0;
513
514 nla_put_failure:
515 err = -EINVAL;
516 errout:
517 nla_nest_cancel(skb, nest);
518 return err;
519 }
520
521 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
522 struct nlattr *est, char *name, int ovr,
523 int bind)
524 {
525 struct tc_action *a;
526 struct tc_action_ops *a_o;
527 char act_name[IFNAMSIZ];
528 struct nlattr *tb[TCA_ACT_MAX + 1];
529 struct nlattr *kind;
530 int err;
531
532 if (name == NULL) {
533 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
534 if (err < 0)
535 goto err_out;
536 err = -EINVAL;
537 kind = tb[TCA_ACT_KIND];
538 if (kind == NULL)
539 goto err_out;
540 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
541 goto err_out;
542 } else {
543 err = -EINVAL;
544 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
545 goto err_out;
546 }
547
548 a_o = tc_lookup_action_n(act_name);
549 if (a_o == NULL) {
550 #ifdef CONFIG_MODULES
551 rtnl_unlock();
552 request_module("act_%s", act_name);
553 rtnl_lock();
554
555 a_o = tc_lookup_action_n(act_name);
556
557 /* We dropped the RTNL semaphore in order to
558 * perform the module load. So, even if we
559 * succeeded in loading the module we have to
560 * tell the caller to replay the request. We
561 * indicate this using -EAGAIN.
562 */
563 if (a_o != NULL) {
564 err = -EAGAIN;
565 goto err_mod;
566 }
567 #endif
568 err = -ENOENT;
569 goto err_out;
570 }
571
572 /* backward compatibility for policer */
573 if (name == NULL)
574 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind);
575 else
576 err = a_o->init(net, nla, est, &a, ovr, bind);
577 if (err < 0)
578 goto err_mod;
579
580 /* module count goes up only when brand new policy is created
581 * if it exists and is only bound to in a_o->init() then
582 * ACT_P_CREATED is not returned (a zero is).
583 */
584 if (err != ACT_P_CREATED)
585 module_put(a_o->owner);
586
587 return a;
588
589 err_mod:
590 module_put(a_o->owner);
591 err_out:
592 return ERR_PTR(err);
593 }
594
595 int tcf_action_init(struct net *net, struct nlattr *nla,
596 struct nlattr *est, char *name, int ovr,
597 int bind, struct list_head *actions)
598 {
599 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
600 struct tc_action *act;
601 int err;
602 int i;
603
604 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
605 if (err < 0)
606 return err;
607
608 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
609 act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
610 if (IS_ERR(act)) {
611 err = PTR_ERR(act);
612 goto err;
613 }
614 act->order = i;
615 list_add_tail(&act->list, actions);
616 }
617 return 0;
618
619 err:
620 tcf_action_destroy(actions, bind);
621 return err;
622 }
623
624 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
625 int compat_mode)
626 {
627 int err = 0;
628 struct gnet_dump d;
629
630 if (p == NULL)
631 goto errout;
632
633 /* compat_mode being true specifies a call that is supposed
634 * to add additional backward compatibility statistic TLVs.
635 */
636 if (compat_mode) {
637 if (p->type == TCA_OLD_COMPAT)
638 err = gnet_stats_start_copy_compat(skb, 0,
639 TCA_STATS,
640 TCA_XSTATS,
641 &p->tcfa_lock, &d,
642 TCA_PAD);
643 else
644 return 0;
645 } else
646 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
647 &p->tcfa_lock, &d, TCA_ACT_PAD);
648
649 if (err < 0)
650 goto errout;
651
652 if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
653 gnet_stats_copy_rate_est(&d, &p->tcfa_bstats,
654 &p->tcfa_rate_est) < 0 ||
655 gnet_stats_copy_queue(&d, p->cpu_qstats,
656 &p->tcfa_qstats,
657 p->tcfa_qstats.qlen) < 0)
658 goto errout;
659
660 if (gnet_stats_finish_copy(&d) < 0)
661 goto errout;
662
663 return 0;
664
665 errout:
666 return -1;
667 }
668
669 static int tca_get_fill(struct sk_buff *skb, struct list_head *actions,
670 u32 portid, u32 seq, u16 flags, int event, int bind,
671 int ref)
672 {
673 struct tcamsg *t;
674 struct nlmsghdr *nlh;
675 unsigned char *b = skb_tail_pointer(skb);
676 struct nlattr *nest;
677
678 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
679 if (!nlh)
680 goto out_nlmsg_trim;
681 t = nlmsg_data(nlh);
682 t->tca_family = AF_UNSPEC;
683 t->tca__pad1 = 0;
684 t->tca__pad2 = 0;
685
686 nest = nla_nest_start(skb, TCA_ACT_TAB);
687 if (nest == NULL)
688 goto out_nlmsg_trim;
689
690 if (tcf_action_dump(skb, actions, bind, ref) < 0)
691 goto out_nlmsg_trim;
692
693 nla_nest_end(skb, nest);
694
695 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
696 return skb->len;
697
698 out_nlmsg_trim:
699 nlmsg_trim(skb, b);
700 return -1;
701 }
702
703 static int
704 act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
705 struct list_head *actions, int event)
706 {
707 struct sk_buff *skb;
708
709 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
710 if (!skb)
711 return -ENOBUFS;
712 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
713 0, 0) <= 0) {
714 kfree_skb(skb);
715 return -EINVAL;
716 }
717
718 return rtnl_unicast(skb, net, portid);
719 }
720
721 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
722 struct nlmsghdr *n, u32 portid)
723 {
724 struct nlattr *tb[TCA_ACT_MAX + 1];
725 const struct tc_action_ops *ops;
726 struct tc_action *a;
727 int index;
728 int err;
729
730 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
731 if (err < 0)
732 goto err_out;
733
734 err = -EINVAL;
735 if (tb[TCA_ACT_INDEX] == NULL ||
736 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
737 goto err_out;
738 index = nla_get_u32(tb[TCA_ACT_INDEX]);
739
740 err = -EINVAL;
741 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
742 if (!ops) /* could happen in batch of actions */
743 goto err_out;
744 err = -ENOENT;
745 if (ops->lookup(net, &a, index) == 0)
746 goto err_mod;
747
748 module_put(ops->owner);
749 return a;
750
751 err_mod:
752 module_put(ops->owner);
753 err_out:
754 return ERR_PTR(err);
755 }
756
757 static int tca_action_flush(struct net *net, struct nlattr *nla,
758 struct nlmsghdr *n, u32 portid)
759 {
760 struct sk_buff *skb;
761 unsigned char *b;
762 struct nlmsghdr *nlh;
763 struct tcamsg *t;
764 struct netlink_callback dcb;
765 struct nlattr *nest;
766 struct nlattr *tb[TCA_ACT_MAX + 1];
767 const struct tc_action_ops *ops;
768 struct nlattr *kind;
769 int err = -ENOMEM;
770
771 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
772 if (!skb) {
773 pr_debug("tca_action_flush: failed skb alloc\n");
774 return err;
775 }
776
777 b = skb_tail_pointer(skb);
778
779 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
780 if (err < 0)
781 goto err_out;
782
783 err = -EINVAL;
784 kind = tb[TCA_ACT_KIND];
785 ops = tc_lookup_action(kind);
786 if (!ops) /*some idjot trying to flush unknown action */
787 goto err_out;
788
789 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
790 sizeof(*t), 0);
791 if (!nlh)
792 goto out_module_put;
793 t = nlmsg_data(nlh);
794 t->tca_family = AF_UNSPEC;
795 t->tca__pad1 = 0;
796 t->tca__pad2 = 0;
797
798 nest = nla_nest_start(skb, TCA_ACT_TAB);
799 if (nest == NULL)
800 goto out_module_put;
801
802 err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops);
803 if (err < 0)
804 goto out_module_put;
805 if (err == 0)
806 goto noflush_out;
807
808 nla_nest_end(skb, nest);
809
810 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
811 nlh->nlmsg_flags |= NLM_F_ROOT;
812 module_put(ops->owner);
813 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
814 n->nlmsg_flags & NLM_F_ECHO);
815 if (err > 0)
816 return 0;
817
818 return err;
819
820 out_module_put:
821 module_put(ops->owner);
822 err_out:
823 noflush_out:
824 kfree_skb(skb);
825 return err;
826 }
827
828 static int
829 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
830 u32 portid)
831 {
832 int ret;
833 struct sk_buff *skb;
834
835 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
836 if (!skb)
837 return -ENOBUFS;
838
839 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
840 0, 1) <= 0) {
841 kfree_skb(skb);
842 return -EINVAL;
843 }
844
845 /* now do the delete */
846 ret = tcf_action_destroy(actions, 0);
847 if (ret < 0) {
848 kfree_skb(skb);
849 return ret;
850 }
851
852 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
853 n->nlmsg_flags & NLM_F_ECHO);
854 if (ret > 0)
855 return 0;
856 return ret;
857 }
858
859 static int
860 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
861 u32 portid, int event)
862 {
863 int i, ret;
864 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
865 struct tc_action *act;
866 LIST_HEAD(actions);
867
868 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
869 if (ret < 0)
870 return ret;
871
872 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
873 if (tb[1] != NULL)
874 return tca_action_flush(net, tb[1], n, portid);
875 else
876 return -EINVAL;
877 }
878
879 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
880 act = tcf_action_get_1(net, tb[i], n, portid);
881 if (IS_ERR(act)) {
882 ret = PTR_ERR(act);
883 goto err;
884 }
885 act->order = i;
886 list_add_tail(&act->list, &actions);
887 }
888
889 if (event == RTM_GETACTION)
890 ret = act_get_notify(net, portid, n, &actions, event);
891 else { /* delete */
892 ret = tcf_del_notify(net, n, &actions, portid);
893 if (ret)
894 goto err;
895 return ret;
896 }
897 err:
898 tcf_action_destroy(&actions, 0);
899 return ret;
900 }
901
902 static int
903 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions,
904 u32 portid)
905 {
906 struct sk_buff *skb;
907 int err = 0;
908
909 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
910 if (!skb)
911 return -ENOBUFS;
912
913 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
914 RTM_NEWACTION, 0, 0) <= 0) {
915 kfree_skb(skb);
916 return -EINVAL;
917 }
918
919 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
920 n->nlmsg_flags & NLM_F_ECHO);
921 if (err > 0)
922 err = 0;
923 return err;
924 }
925
926 static int
927 tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
928 u32 portid, int ovr)
929 {
930 int ret = 0;
931 LIST_HEAD(actions);
932
933 ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions);
934 if (ret)
935 return ret;
936
937 return tcf_add_notify(net, n, &actions, portid);
938 }
939
940 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
941 {
942 struct net *net = sock_net(skb->sk);
943 struct nlattr *tca[TCA_ACT_MAX + 1];
944 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
945 int ret = 0, ovr = 0;
946
947 if ((n->nlmsg_type != RTM_GETACTION) &&
948 !netlink_capable(skb, CAP_NET_ADMIN))
949 return -EPERM;
950
951 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
952 if (ret < 0)
953 return ret;
954
955 if (tca[TCA_ACT_TAB] == NULL) {
956 pr_notice("tc_ctl_action: received NO action attribs\n");
957 return -EINVAL;
958 }
959
960 /* n->nlmsg_flags & NLM_F_CREATE */
961 switch (n->nlmsg_type) {
962 case RTM_NEWACTION:
963 /* we are going to assume all other flags
964 * imply create only if it doesn't exist
965 * Note that CREATE | EXCL implies that
966 * but since we want avoid ambiguity (eg when flags
967 * is zero) then just set this
968 */
969 if (n->nlmsg_flags & NLM_F_REPLACE)
970 ovr = 1;
971 replay:
972 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
973 if (ret == -EAGAIN)
974 goto replay;
975 break;
976 case RTM_DELACTION:
977 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
978 portid, RTM_DELACTION);
979 break;
980 case RTM_GETACTION:
981 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
982 portid, RTM_GETACTION);
983 break;
984 default:
985 BUG();
986 }
987
988 return ret;
989 }
990
991 static struct nlattr *
992 find_dump_kind(const struct nlmsghdr *n)
993 {
994 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
995 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
996 struct nlattr *nla[TCAA_MAX + 1];
997 struct nlattr *kind;
998
999 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1000 return NULL;
1001 tb1 = nla[TCA_ACT_TAB];
1002 if (tb1 == NULL)
1003 return NULL;
1004
1005 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1006 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1007 return NULL;
1008
1009 if (tb[1] == NULL)
1010 return NULL;
1011 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1012 nla_len(tb[1]), NULL) < 0)
1013 return NULL;
1014 kind = tb2[TCA_ACT_KIND];
1015
1016 return kind;
1017 }
1018
1019 static int
1020 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1021 {
1022 struct net *net = sock_net(skb->sk);
1023 struct nlmsghdr *nlh;
1024 unsigned char *b = skb_tail_pointer(skb);
1025 struct nlattr *nest;
1026 struct tc_action_ops *a_o;
1027 int ret = 0;
1028 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1029 struct nlattr *kind = find_dump_kind(cb->nlh);
1030
1031 if (kind == NULL) {
1032 pr_info("tc_dump_action: action bad kind\n");
1033 return 0;
1034 }
1035
1036 a_o = tc_lookup_action(kind);
1037 if (a_o == NULL)
1038 return 0;
1039
1040 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1041 cb->nlh->nlmsg_type, sizeof(*t), 0);
1042 if (!nlh)
1043 goto out_module_put;
1044 t = nlmsg_data(nlh);
1045 t->tca_family = AF_UNSPEC;
1046 t->tca__pad1 = 0;
1047 t->tca__pad2 = 0;
1048
1049 nest = nla_nest_start(skb, TCA_ACT_TAB);
1050 if (nest == NULL)
1051 goto out_module_put;
1052
1053 ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o);
1054 if (ret < 0)
1055 goto out_module_put;
1056
1057 if (ret > 0) {
1058 nla_nest_end(skb, nest);
1059 ret = skb->len;
1060 } else
1061 nlmsg_trim(skb, b);
1062
1063 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1064 if (NETLINK_CB(cb->skb).portid && ret)
1065 nlh->nlmsg_flags |= NLM_F_MULTI;
1066 module_put(a_o->owner);
1067 return skb->len;
1068
1069 out_module_put:
1070 module_put(a_o->owner);
1071 nlmsg_trim(skb, b);
1072 return skb->len;
1073 }
1074
1075 static int __init tc_action_init(void)
1076 {
1077 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1078 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1079 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1080 NULL);
1081
1082 return 0;
1083 }
1084
1085 subsys_initcall(tc_action_init);
Linux with added FPC-III support