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net: Use netlink_ns_capable to verify the permisions of netlink messages
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / sched / act_api.c
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 void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
31 {
32 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
33 struct tcf_common **p1p;
34
35 for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
36 if (*p1p == p) {
37 write_lock_bh(hinfo->lock);
38 *p1p = p->tcfc_next;
39 write_unlock_bh(hinfo->lock);
40 gen_kill_estimator(&p->tcfc_bstats,
41 &p->tcfc_rate_est);
42 /*
43 * gen_estimator est_timer() might access p->tcfc_lock
44 * or bstats, wait a RCU grace period before freeing p
45 */
46 kfree_rcu(p, tcfc_rcu);
47 return;
48 }
49 }
50 WARN_ON(1);
51 }
52 EXPORT_SYMBOL(tcf_hash_destroy);
53
54 int tcf_hash_release(struct tcf_common *p, int bind,
55 struct tcf_hashinfo *hinfo)
56 {
57 int ret = 0;
58
59 if (p) {
60 if (bind)
61 p->tcfc_bindcnt--;
62
63 p->tcfc_refcnt--;
64 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
65 tcf_hash_destroy(p, hinfo);
66 ret = 1;
67 }
68 }
69 return ret;
70 }
71 EXPORT_SYMBOL(tcf_hash_release);
72
73 static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
74 struct tc_action *a, struct tcf_hashinfo *hinfo)
75 {
76 struct tcf_common *p;
77 int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
78 struct nlattr *nest;
79
80 read_lock_bh(hinfo->lock);
81
82 s_i = cb->args[0];
83
84 for (i = 0; i < (hinfo->hmask + 1); i++) {
85 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
86
87 for (; p; p = p->tcfc_next) {
88 index++;
89 if (index < s_i)
90 continue;
91 a->priv = p;
92 a->order = n_i;
93
94 nest = nla_nest_start(skb, a->order);
95 if (nest == NULL)
96 goto nla_put_failure;
97 err = tcf_action_dump_1(skb, a, 0, 0);
98 if (err < 0) {
99 index--;
100 nlmsg_trim(skb, nest);
101 goto done;
102 }
103 nla_nest_end(skb, nest);
104 n_i++;
105 if (n_i >= TCA_ACT_MAX_PRIO)
106 goto done;
107 }
108 }
109 done:
110 read_unlock_bh(hinfo->lock);
111 if (n_i)
112 cb->args[0] += n_i;
113 return n_i;
114
115 nla_put_failure:
116 nla_nest_cancel(skb, nest);
117 goto done;
118 }
119
120 static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
121 struct tcf_hashinfo *hinfo)
122 {
123 struct tcf_common *p, *s_p;
124 struct nlattr *nest;
125 int i = 0, n_i = 0;
126
127 nest = nla_nest_start(skb, a->order);
128 if (nest == NULL)
129 goto nla_put_failure;
130 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
131 goto nla_put_failure;
132 for (i = 0; i < (hinfo->hmask + 1); i++) {
133 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
134
135 while (p != NULL) {
136 s_p = p->tcfc_next;
137 if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo))
138 module_put(a->ops->owner);
139 n_i++;
140 p = s_p;
141 }
142 }
143 if (nla_put_u32(skb, TCA_FCNT, n_i))
144 goto nla_put_failure;
145 nla_nest_end(skb, nest);
146
147 return n_i;
148 nla_put_failure:
149 nla_nest_cancel(skb, nest);
150 return -EINVAL;
151 }
152
153 int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
154 int type, struct tc_action *a)
155 {
156 struct tcf_hashinfo *hinfo = a->ops->hinfo;
157
158 if (type == RTM_DELACTION) {
159 return tcf_del_walker(skb, a, hinfo);
160 } else if (type == RTM_GETACTION) {
161 return tcf_dump_walker(skb, cb, a, hinfo);
162 } else {
163 WARN(1, "tcf_generic_walker: unknown action %d\n", type);
164 return -EINVAL;
165 }
166 }
167 EXPORT_SYMBOL(tcf_generic_walker);
168
169 struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
170 {
171 struct tcf_common *p;
172
173 read_lock_bh(hinfo->lock);
174 for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
175 p = p->tcfc_next) {
176 if (p->tcfc_index == index)
177 break;
178 }
179 read_unlock_bh(hinfo->lock);
180
181 return p;
182 }
183 EXPORT_SYMBOL(tcf_hash_lookup);
184
185 u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
186 {
187 u32 val = *idx_gen;
188
189 do {
190 if (++val == 0)
191 val = 1;
192 } while (tcf_hash_lookup(val, hinfo));
193
194 return (*idx_gen = val);
195 }
196 EXPORT_SYMBOL(tcf_hash_new_index);
197
198 int tcf_hash_search(struct tc_action *a, u32 index)
199 {
200 struct tcf_hashinfo *hinfo = a->ops->hinfo;
201 struct tcf_common *p = tcf_hash_lookup(index, hinfo);
202
203 if (p) {
204 a->priv = p;
205 return 1;
206 }
207 return 0;
208 }
209 EXPORT_SYMBOL(tcf_hash_search);
210
211 struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
212 struct tcf_hashinfo *hinfo)
213 {
214 struct tcf_common *p = NULL;
215 if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
216 if (bind)
217 p->tcfc_bindcnt++;
218 p->tcfc_refcnt++;
219 a->priv = p;
220 }
221 return p;
222 }
223 EXPORT_SYMBOL(tcf_hash_check);
224
225 struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est,
226 struct tc_action *a, int size, int bind,
227 u32 *idx_gen, struct tcf_hashinfo *hinfo)
228 {
229 struct tcf_common *p = kzalloc(size, GFP_KERNEL);
230
231 if (unlikely(!p))
232 return ERR_PTR(-ENOMEM);
233 p->tcfc_refcnt = 1;
234 if (bind)
235 p->tcfc_bindcnt = 1;
236
237 spin_lock_init(&p->tcfc_lock);
238 p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
239 p->tcfc_tm.install = jiffies;
240 p->tcfc_tm.lastuse = jiffies;
241 if (est) {
242 int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
243 &p->tcfc_lock, est);
244 if (err) {
245 kfree(p);
246 return ERR_PTR(err);
247 }
248 }
249
250 a->priv = (void *) p;
251 return p;
252 }
253 EXPORT_SYMBOL(tcf_hash_create);
254
255 void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
256 {
257 unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
258
259 write_lock_bh(hinfo->lock);
260 p->tcfc_next = hinfo->htab[h];
261 hinfo->htab[h] = p;
262 write_unlock_bh(hinfo->lock);
263 }
264 EXPORT_SYMBOL(tcf_hash_insert);
265
266 static struct tc_action_ops *act_base = NULL;
267 static DEFINE_RWLOCK(act_mod_lock);
268
269 int tcf_register_action(struct tc_action_ops *act)
270 {
271 struct tc_action_ops *a, **ap;
272
273 write_lock(&act_mod_lock);
274 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
275 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
276 write_unlock(&act_mod_lock);
277 return -EEXIST;
278 }
279 }
280 act->next = NULL;
281 *ap = act;
282 write_unlock(&act_mod_lock);
283 return 0;
284 }
285 EXPORT_SYMBOL(tcf_register_action);
286
287 int tcf_unregister_action(struct tc_action_ops *act)
288 {
289 struct tc_action_ops *a, **ap;
290 int err = -ENOENT;
291
292 write_lock(&act_mod_lock);
293 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
294 if (a == act)
295 break;
296 if (a) {
297 *ap = a->next;
298 a->next = NULL;
299 err = 0;
300 }
301 write_unlock(&act_mod_lock);
302 return err;
303 }
304 EXPORT_SYMBOL(tcf_unregister_action);
305
306 /* lookup by name */
307 static struct tc_action_ops *tc_lookup_action_n(char *kind)
308 {
309 struct tc_action_ops *a = NULL;
310
311 if (kind) {
312 read_lock(&act_mod_lock);
313 for (a = act_base; a; a = a->next) {
314 if (strcmp(kind, a->kind) == 0) {
315 if (!try_module_get(a->owner)) {
316 read_unlock(&act_mod_lock);
317 return NULL;
318 }
319 break;
320 }
321 }
322 read_unlock(&act_mod_lock);
323 }
324 return a;
325 }
326
327 /* lookup by nlattr */
328 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
329 {
330 struct tc_action_ops *a = NULL;
331
332 if (kind) {
333 read_lock(&act_mod_lock);
334 for (a = act_base; a; a = a->next) {
335 if (nla_strcmp(kind, a->kind) == 0) {
336 if (!try_module_get(a->owner)) {
337 read_unlock(&act_mod_lock);
338 return NULL;
339 }
340 break;
341 }
342 }
343 read_unlock(&act_mod_lock);
344 }
345 return a;
346 }
347
348 #if 0
349 /* lookup by id */
350 static struct tc_action_ops *tc_lookup_action_id(u32 type)
351 {
352 struct tc_action_ops *a = NULL;
353
354 if (type) {
355 read_lock(&act_mod_lock);
356 for (a = act_base; a; a = a->next) {
357 if (a->type == type) {
358 if (!try_module_get(a->owner)) {
359 read_unlock(&act_mod_lock);
360 return NULL;
361 }
362 break;
363 }
364 }
365 read_unlock(&act_mod_lock);
366 }
367 return a;
368 }
369 #endif
370
371 int tcf_action_exec(struct sk_buff *skb, const struct tc_action *act,
372 struct tcf_result *res)
373 {
374 const struct tc_action *a;
375 int ret = -1;
376
377 if (skb->tc_verd & TC_NCLS) {
378 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
379 ret = TC_ACT_OK;
380 goto exec_done;
381 }
382 while ((a = act) != NULL) {
383 repeat:
384 if (a->ops && a->ops->act) {
385 ret = a->ops->act(skb, a, res);
386 if (TC_MUNGED & skb->tc_verd) {
387 /* copied already, allow trampling */
388 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
389 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
390 }
391 if (ret == TC_ACT_REPEAT)
392 goto repeat; /* we need a ttl - JHS */
393 if (ret != TC_ACT_PIPE)
394 goto exec_done;
395 }
396 act = a->next;
397 }
398 exec_done:
399 return ret;
400 }
401 EXPORT_SYMBOL(tcf_action_exec);
402
403 void tcf_action_destroy(struct tc_action *act, int bind)
404 {
405 struct tc_action *a;
406
407 for (a = act; a; a = act) {
408 if (a->ops && a->ops->cleanup) {
409 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
410 module_put(a->ops->owner);
411 act = act->next;
412 kfree(a);
413 } else {
414 /*FIXME: Remove later - catch insertion bugs*/
415 WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n");
416 act = act->next;
417 kfree(a);
418 }
419 }
420 }
421
422 int
423 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
424 {
425 int err = -EINVAL;
426
427 if (a->ops == NULL || a->ops->dump == NULL)
428 return err;
429 return a->ops->dump(skb, a, bind, ref);
430 }
431
432 int
433 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
434 {
435 int err = -EINVAL;
436 unsigned char *b = skb_tail_pointer(skb);
437 struct nlattr *nest;
438
439 if (a->ops == NULL || a->ops->dump == NULL)
440 return err;
441
442 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
443 goto nla_put_failure;
444 if (tcf_action_copy_stats(skb, a, 0))
445 goto nla_put_failure;
446 nest = nla_nest_start(skb, TCA_OPTIONS);
447 if (nest == NULL)
448 goto nla_put_failure;
449 err = tcf_action_dump_old(skb, a, bind, ref);
450 if (err > 0) {
451 nla_nest_end(skb, nest);
452 return err;
453 }
454
455 nla_put_failure:
456 nlmsg_trim(skb, b);
457 return -1;
458 }
459 EXPORT_SYMBOL(tcf_action_dump_1);
460
461 int
462 tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
463 {
464 struct tc_action *a;
465 int err = -EINVAL;
466 struct nlattr *nest;
467
468 while ((a = act) != NULL) {
469 act = a->next;
470 nest = nla_nest_start(skb, a->order);
471 if (nest == NULL)
472 goto nla_put_failure;
473 err = tcf_action_dump_1(skb, a, bind, ref);
474 if (err < 0)
475 goto errout;
476 nla_nest_end(skb, nest);
477 }
478
479 return 0;
480
481 nla_put_failure:
482 err = -EINVAL;
483 errout:
484 nla_nest_cancel(skb, nest);
485 return err;
486 }
487
488 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
489 struct nlattr *est, char *name, int ovr,
490 int bind)
491 {
492 struct tc_action *a;
493 struct tc_action_ops *a_o;
494 char act_name[IFNAMSIZ];
495 struct nlattr *tb[TCA_ACT_MAX + 1];
496 struct nlattr *kind;
497 int err;
498
499 if (name == NULL) {
500 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
501 if (err < 0)
502 goto err_out;
503 err = -EINVAL;
504 kind = tb[TCA_ACT_KIND];
505 if (kind == NULL)
506 goto err_out;
507 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
508 goto err_out;
509 } else {
510 err = -EINVAL;
511 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
512 goto err_out;
513 }
514
515 a_o = tc_lookup_action_n(act_name);
516 if (a_o == NULL) {
517 #ifdef CONFIG_MODULES
518 rtnl_unlock();
519 request_module("act_%s", act_name);
520 rtnl_lock();
521
522 a_o = tc_lookup_action_n(act_name);
523
524 /* We dropped the RTNL semaphore in order to
525 * perform the module load. So, even if we
526 * succeeded in loading the module we have to
527 * tell the caller to replay the request. We
528 * indicate this using -EAGAIN.
529 */
530 if (a_o != NULL) {
531 err = -EAGAIN;
532 goto err_mod;
533 }
534 #endif
535 err = -ENOENT;
536 goto err_out;
537 }
538
539 err = -ENOMEM;
540 a = kzalloc(sizeof(*a), GFP_KERNEL);
541 if (a == NULL)
542 goto err_mod;
543
544 /* backward compatibility for policer */
545 if (name == NULL)
546 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
547 else
548 err = a_o->init(net, nla, est, a, ovr, bind);
549 if (err < 0)
550 goto err_free;
551
552 /* module count goes up only when brand new policy is created
553 * if it exists and is only bound to in a_o->init() then
554 * ACT_P_CREATED is not returned (a zero is).
555 */
556 if (err != ACT_P_CREATED)
557 module_put(a_o->owner);
558 a->ops = a_o;
559
560 return a;
561
562 err_free:
563 kfree(a);
564 err_mod:
565 module_put(a_o->owner);
566 err_out:
567 return ERR_PTR(err);
568 }
569
570 struct tc_action *tcf_action_init(struct net *net, struct nlattr *nla,
571 struct nlattr *est, char *name, int ovr,
572 int bind)
573 {
574 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
575 struct tc_action *head = NULL, *act, *act_prev = NULL;
576 int err;
577 int i;
578
579 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
580 if (err < 0)
581 return ERR_PTR(err);
582
583 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
584 act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
585 if (IS_ERR(act))
586 goto err;
587 act->order = i;
588
589 if (head == NULL)
590 head = act;
591 else
592 act_prev->next = act;
593 act_prev = act;
594 }
595 return head;
596
597 err:
598 if (head != NULL)
599 tcf_action_destroy(head, bind);
600 return act;
601 }
602
603 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
604 int compat_mode)
605 {
606 int err = 0;
607 struct gnet_dump d;
608 struct tcf_act_hdr *h = a->priv;
609
610 if (h == NULL)
611 goto errout;
612
613 /* compat_mode being true specifies a call that is supposed
614 * to add additional backward compatibility statistic TLVs.
615 */
616 if (compat_mode) {
617 if (a->type == TCA_OLD_COMPAT)
618 err = gnet_stats_start_copy_compat(skb, 0,
619 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
620 else
621 return 0;
622 } else
623 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
624 &h->tcf_lock, &d);
625
626 if (err < 0)
627 goto errout;
628
629 if (a->ops != NULL && a->ops->get_stats != NULL)
630 if (a->ops->get_stats(skb, a) < 0)
631 goto errout;
632
633 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
634 gnet_stats_copy_rate_est(&d, &h->tcf_bstats,
635 &h->tcf_rate_est) < 0 ||
636 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
637 goto errout;
638
639 if (gnet_stats_finish_copy(&d) < 0)
640 goto errout;
641
642 return 0;
643
644 errout:
645 return -1;
646 }
647
648 static int
649 tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 portid, u32 seq,
650 u16 flags, int event, int bind, int ref)
651 {
652 struct tcamsg *t;
653 struct nlmsghdr *nlh;
654 unsigned char *b = skb_tail_pointer(skb);
655 struct nlattr *nest;
656
657 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
658 if (!nlh)
659 goto out_nlmsg_trim;
660 t = nlmsg_data(nlh);
661 t->tca_family = AF_UNSPEC;
662 t->tca__pad1 = 0;
663 t->tca__pad2 = 0;
664
665 nest = nla_nest_start(skb, TCA_ACT_TAB);
666 if (nest == NULL)
667 goto out_nlmsg_trim;
668
669 if (tcf_action_dump(skb, a, bind, ref) < 0)
670 goto out_nlmsg_trim;
671
672 nla_nest_end(skb, nest);
673
674 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
675 return skb->len;
676
677 out_nlmsg_trim:
678 nlmsg_trim(skb, b);
679 return -1;
680 }
681
682 static int
683 act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
684 struct tc_action *a, int event)
685 {
686 struct sk_buff *skb;
687
688 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
689 if (!skb)
690 return -ENOBUFS;
691 if (tca_get_fill(skb, a, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
692 kfree_skb(skb);
693 return -EINVAL;
694 }
695
696 return rtnl_unicast(skb, net, portid);
697 }
698
699 static struct tc_action *
700 tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid)
701 {
702 struct nlattr *tb[TCA_ACT_MAX + 1];
703 struct tc_action *a;
704 int index;
705 int err;
706
707 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
708 if (err < 0)
709 goto err_out;
710
711 err = -EINVAL;
712 if (tb[TCA_ACT_INDEX] == NULL ||
713 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
714 goto err_out;
715 index = nla_get_u32(tb[TCA_ACT_INDEX]);
716
717 err = -ENOMEM;
718 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
719 if (a == NULL)
720 goto err_out;
721
722 err = -EINVAL;
723 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
724 if (a->ops == NULL)
725 goto err_free;
726 if (a->ops->lookup == NULL)
727 goto err_mod;
728 err = -ENOENT;
729 if (a->ops->lookup(a, index) == 0)
730 goto err_mod;
731
732 module_put(a->ops->owner);
733 return a;
734
735 err_mod:
736 module_put(a->ops->owner);
737 err_free:
738 kfree(a);
739 err_out:
740 return ERR_PTR(err);
741 }
742
743 static void cleanup_a(struct tc_action *act)
744 {
745 struct tc_action *a;
746
747 for (a = act; a; a = act) {
748 act = a->next;
749 kfree(a);
750 }
751 }
752
753 static struct tc_action *create_a(int i)
754 {
755 struct tc_action *act;
756
757 act = kzalloc(sizeof(*act), GFP_KERNEL);
758 if (act == NULL) {
759 pr_debug("create_a: failed to alloc!\n");
760 return NULL;
761 }
762 act->order = i;
763 return act;
764 }
765
766 static int tca_action_flush(struct net *net, struct nlattr *nla,
767 struct nlmsghdr *n, u32 portid)
768 {
769 struct sk_buff *skb;
770 unsigned char *b;
771 struct nlmsghdr *nlh;
772 struct tcamsg *t;
773 struct netlink_callback dcb;
774 struct nlattr *nest;
775 struct nlattr *tb[TCA_ACT_MAX + 1];
776 struct nlattr *kind;
777 struct tc_action *a = create_a(0);
778 int err = -ENOMEM;
779
780 if (a == NULL) {
781 pr_debug("tca_action_flush: couldnt create tc_action\n");
782 return err;
783 }
784
785 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
786 if (!skb) {
787 pr_debug("tca_action_flush: failed skb alloc\n");
788 kfree(a);
789 return err;
790 }
791
792 b = skb_tail_pointer(skb);
793
794 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
795 if (err < 0)
796 goto err_out;
797
798 err = -EINVAL;
799 kind = tb[TCA_ACT_KIND];
800 a->ops = tc_lookup_action(kind);
801 if (a->ops == NULL)
802 goto err_out;
803
804 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0);
805 if (!nlh)
806 goto out_module_put;
807 t = nlmsg_data(nlh);
808 t->tca_family = AF_UNSPEC;
809 t->tca__pad1 = 0;
810 t->tca__pad2 = 0;
811
812 nest = nla_nest_start(skb, TCA_ACT_TAB);
813 if (nest == NULL)
814 goto out_module_put;
815
816 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
817 if (err < 0)
818 goto out_module_put;
819 if (err == 0)
820 goto noflush_out;
821
822 nla_nest_end(skb, nest);
823
824 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
825 nlh->nlmsg_flags |= NLM_F_ROOT;
826 module_put(a->ops->owner);
827 kfree(a);
828 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
829 n->nlmsg_flags & NLM_F_ECHO);
830 if (err > 0)
831 return 0;
832
833 return err;
834
835 out_module_put:
836 module_put(a->ops->owner);
837 err_out:
838 noflush_out:
839 kfree_skb(skb);
840 kfree(a);
841 return err;
842 }
843
844 static int
845 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
846 u32 portid, int event)
847 {
848 int i, ret;
849 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
850 struct tc_action *head = NULL, *act, *act_prev = NULL;
851
852 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
853 if (ret < 0)
854 return ret;
855
856 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
857 if (tb[1] != NULL)
858 return tca_action_flush(net, tb[1], n, portid);
859 else
860 return -EINVAL;
861 }
862
863 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
864 act = tcf_action_get_1(tb[i], n, portid);
865 if (IS_ERR(act)) {
866 ret = PTR_ERR(act);
867 goto err;
868 }
869 act->order = i;
870
871 if (head == NULL)
872 head = act;
873 else
874 act_prev->next = act;
875 act_prev = act;
876 }
877
878 if (event == RTM_GETACTION)
879 ret = act_get_notify(net, portid, n, head, event);
880 else { /* delete */
881 struct sk_buff *skb;
882
883 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
884 if (!skb) {
885 ret = -ENOBUFS;
886 goto err;
887 }
888
889 if (tca_get_fill(skb, head, portid, n->nlmsg_seq, 0, event,
890 0, 1) <= 0) {
891 kfree_skb(skb);
892 ret = -EINVAL;
893 goto err;
894 }
895
896 /* now do the delete */
897 tcf_action_destroy(head, 0);
898 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
899 n->nlmsg_flags & NLM_F_ECHO);
900 if (ret > 0)
901 return 0;
902 return ret;
903 }
904 err:
905 cleanup_a(head);
906 return ret;
907 }
908
909 static int tcf_add_notify(struct net *net, struct tc_action *a,
910 u32 portid, u32 seq, int event, u16 flags)
911 {
912 struct tcamsg *t;
913 struct nlmsghdr *nlh;
914 struct sk_buff *skb;
915 struct nlattr *nest;
916 unsigned char *b;
917 int err = 0;
918
919 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
920 if (!skb)
921 return -ENOBUFS;
922
923 b = skb_tail_pointer(skb);
924
925 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
926 if (!nlh)
927 goto out_kfree_skb;
928 t = nlmsg_data(nlh);
929 t->tca_family = AF_UNSPEC;
930 t->tca__pad1 = 0;
931 t->tca__pad2 = 0;
932
933 nest = nla_nest_start(skb, TCA_ACT_TAB);
934 if (nest == NULL)
935 goto out_kfree_skb;
936
937 if (tcf_action_dump(skb, a, 0, 0) < 0)
938 goto out_kfree_skb;
939
940 nla_nest_end(skb, nest);
941
942 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
943 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
944
945 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
946 if (err > 0)
947 err = 0;
948 return err;
949
950 out_kfree_skb:
951 kfree_skb(skb);
952 return -1;
953 }
954
955
956 static int
957 tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
958 u32 portid, int ovr)
959 {
960 int ret = 0;
961 struct tc_action *act;
962 struct tc_action *a;
963 u32 seq = n->nlmsg_seq;
964
965 act = tcf_action_init(net, nla, NULL, NULL, ovr, 0);
966 if (act == NULL)
967 goto done;
968 if (IS_ERR(act)) {
969 ret = PTR_ERR(act);
970 goto done;
971 }
972
973 /* dump then free all the actions after update; inserted policy
974 * stays intact
975 */
976 ret = tcf_add_notify(net, act, portid, seq, RTM_NEWACTION, n->nlmsg_flags);
977 for (a = act; a; a = act) {
978 act = a->next;
979 kfree(a);
980 }
981 done:
982 return ret;
983 }
984
985 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
986 {
987 struct net *net = sock_net(skb->sk);
988 struct nlattr *tca[TCA_ACT_MAX + 1];
989 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
990 int ret = 0, ovr = 0;
991
992 if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN))
993 return -EPERM;
994
995 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
996 if (ret < 0)
997 return ret;
998
999 if (tca[TCA_ACT_TAB] == NULL) {
1000 pr_notice("tc_ctl_action: received NO action attribs\n");
1001 return -EINVAL;
1002 }
1003
1004 /* n->nlmsg_flags & NLM_F_CREATE */
1005 switch (n->nlmsg_type) {
1006 case RTM_NEWACTION:
1007 /* we are going to assume all other flags
1008 * imply create only if it doesn't exist
1009 * Note that CREATE | EXCL implies that
1010 * but since we want avoid ambiguity (eg when flags
1011 * is zero) then just set this
1012 */
1013 if (n->nlmsg_flags & NLM_F_REPLACE)
1014 ovr = 1;
1015 replay:
1016 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
1017 if (ret == -EAGAIN)
1018 goto replay;
1019 break;
1020 case RTM_DELACTION:
1021 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1022 portid, RTM_DELACTION);
1023 break;
1024 case RTM_GETACTION:
1025 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1026 portid, RTM_GETACTION);
1027 break;
1028 default:
1029 BUG();
1030 }
1031
1032 return ret;
1033 }
1034
1035 static struct nlattr *
1036 find_dump_kind(const struct nlmsghdr *n)
1037 {
1038 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1039 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1040 struct nlattr *nla[TCAA_MAX + 1];
1041 struct nlattr *kind;
1042
1043 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1044 return NULL;
1045 tb1 = nla[TCA_ACT_TAB];
1046 if (tb1 == NULL)
1047 return NULL;
1048
1049 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1050 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1051 return NULL;
1052
1053 if (tb[1] == NULL)
1054 return NULL;
1055 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1056 nla_len(tb[1]), NULL) < 0)
1057 return NULL;
1058 kind = tb2[TCA_ACT_KIND];
1059
1060 return kind;
1061 }
1062
1063 static int
1064 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1065 {
1066 struct nlmsghdr *nlh;
1067 unsigned char *b = skb_tail_pointer(skb);
1068 struct nlattr *nest;
1069 struct tc_action_ops *a_o;
1070 struct tc_action a;
1071 int ret = 0;
1072 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1073 struct nlattr *kind = find_dump_kind(cb->nlh);
1074
1075 if (kind == NULL) {
1076 pr_info("tc_dump_action: action bad kind\n");
1077 return 0;
1078 }
1079
1080 a_o = tc_lookup_action(kind);
1081 if (a_o == NULL)
1082 return 0;
1083
1084 memset(&a, 0, sizeof(struct tc_action));
1085 a.ops = a_o;
1086
1087 if (a_o->walk == NULL) {
1088 WARN(1, "tc_dump_action: %s !capable of dumping table\n",
1089 a_o->kind);
1090 goto out_module_put;
1091 }
1092
1093 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1094 cb->nlh->nlmsg_type, sizeof(*t), 0);
1095 if (!nlh)
1096 goto out_module_put;
1097 t = nlmsg_data(nlh);
1098 t->tca_family = AF_UNSPEC;
1099 t->tca__pad1 = 0;
1100 t->tca__pad2 = 0;
1101
1102 nest = nla_nest_start(skb, TCA_ACT_TAB);
1103 if (nest == NULL)
1104 goto out_module_put;
1105
1106 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1107 if (ret < 0)
1108 goto out_module_put;
1109
1110 if (ret > 0) {
1111 nla_nest_end(skb, nest);
1112 ret = skb->len;
1113 } else
1114 nla_nest_cancel(skb, nest);
1115
1116 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1117 if (NETLINK_CB(cb->skb).portid && ret)
1118 nlh->nlmsg_flags |= NLM_F_MULTI;
1119 module_put(a_o->owner);
1120 return skb->len;
1121
1122 out_module_put:
1123 module_put(a_o->owner);
1124 nlmsg_trim(skb, b);
1125 return skb->len;
1126 }
1127
1128 static int __init tc_action_init(void)
1129 {
1130 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1131 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1132 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1133 NULL);
1134
1135 return 0;
1136 }
1137
1138 subsys_initcall(tc_action_init);
kernel source for telekom puls (alcatel/mediatek)