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net_sched: Fail if missing mandatory action operation methods
[deliverable/linux.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 /* Must supply act, dump, cleanup and init */
274 if (!act->act || !act->dump || !act->cleanup || !act->init)
275 return -EINVAL;
276
277 write_lock(&act_mod_lock);
278 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
279 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
280 write_unlock(&act_mod_lock);
281 return -EEXIST;
282 }
283 }
284 act->next = NULL;
285 *ap = act;
286 write_unlock(&act_mod_lock);
287 return 0;
288 }
289 EXPORT_SYMBOL(tcf_register_action);
290
291 int tcf_unregister_action(struct tc_action_ops *act)
292 {
293 struct tc_action_ops *a, **ap;
294 int err = -ENOENT;
295
296 write_lock(&act_mod_lock);
297 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
298 if (a == act)
299 break;
300 if (a) {
301 *ap = a->next;
302 a->next = NULL;
303 err = 0;
304 }
305 write_unlock(&act_mod_lock);
306 return err;
307 }
308 EXPORT_SYMBOL(tcf_unregister_action);
309
310 /* lookup by name */
311 static struct tc_action_ops *tc_lookup_action_n(char *kind)
312 {
313 struct tc_action_ops *a = NULL;
314
315 if (kind) {
316 read_lock(&act_mod_lock);
317 for (a = act_base; a; a = a->next) {
318 if (strcmp(kind, a->kind) == 0) {
319 if (!try_module_get(a->owner)) {
320 read_unlock(&act_mod_lock);
321 return NULL;
322 }
323 break;
324 }
325 }
326 read_unlock(&act_mod_lock);
327 }
328 return a;
329 }
330
331 /* lookup by nlattr */
332 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
333 {
334 struct tc_action_ops *a = NULL;
335
336 if (kind) {
337 read_lock(&act_mod_lock);
338 for (a = act_base; a; a = a->next) {
339 if (nla_strcmp(kind, a->kind) == 0) {
340 if (!try_module_get(a->owner)) {
341 read_unlock(&act_mod_lock);
342 return NULL;
343 }
344 break;
345 }
346 }
347 read_unlock(&act_mod_lock);
348 }
349 return a;
350 }
351
352 #if 0
353 /* lookup by id */
354 static struct tc_action_ops *tc_lookup_action_id(u32 type)
355 {
356 struct tc_action_ops *a = NULL;
357
358 if (type) {
359 read_lock(&act_mod_lock);
360 for (a = act_base; a; a = a->next) {
361 if (a->type == type) {
362 if (!try_module_get(a->owner)) {
363 read_unlock(&act_mod_lock);
364 return NULL;
365 }
366 break;
367 }
368 }
369 read_unlock(&act_mod_lock);
370 }
371 return a;
372 }
373 #endif
374
375 int tcf_action_exec(struct sk_buff *skb, const struct tc_action *act,
376 struct tcf_result *res)
377 {
378 const struct tc_action *a;
379 int ret = -1;
380
381 if (skb->tc_verd & TC_NCLS) {
382 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
383 ret = TC_ACT_OK;
384 goto exec_done;
385 }
386 while ((a = act) != NULL) {
387 repeat:
388 if (a->ops) {
389 ret = a->ops->act(skb, a, res);
390 if (TC_MUNGED & skb->tc_verd) {
391 /* copied already, allow trampling */
392 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
393 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
394 }
395 if (ret == TC_ACT_REPEAT)
396 goto repeat; /* we need a ttl - JHS */
397 if (ret != TC_ACT_PIPE)
398 goto exec_done;
399 }
400 act = a->next;
401 }
402 exec_done:
403 return ret;
404 }
405 EXPORT_SYMBOL(tcf_action_exec);
406
407 void tcf_action_destroy(struct tc_action *act, int bind)
408 {
409 struct tc_action *a;
410
411 for (a = act; a; a = act) {
412 if (a->ops) {
413 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
414 module_put(a->ops->owner);
415 act = act->next;
416 kfree(a);
417 } else {
418 /*FIXME: Remove later - catch insertion bugs*/
419 WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n");
420 act = act->next;
421 kfree(a);
422 }
423 }
424 }
425
426 int
427 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
428 {
429 int err = -EINVAL;
430
431 if (a->ops == NULL)
432 return err;
433 return a->ops->dump(skb, a, bind, ref);
434 }
435
436 int
437 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
438 {
439 int err = -EINVAL;
440 unsigned char *b = skb_tail_pointer(skb);
441 struct nlattr *nest;
442
443 if (a->ops == NULL)
444 return err;
445
446 if (nla_put_string(skb, TCA_KIND, a->ops->kind))
447 goto nla_put_failure;
448 if (tcf_action_copy_stats(skb, a, 0))
449 goto nla_put_failure;
450 nest = nla_nest_start(skb, TCA_OPTIONS);
451 if (nest == NULL)
452 goto nla_put_failure;
453 err = tcf_action_dump_old(skb, a, bind, ref);
454 if (err > 0) {
455 nla_nest_end(skb, nest);
456 return err;
457 }
458
459 nla_put_failure:
460 nlmsg_trim(skb, b);
461 return -1;
462 }
463 EXPORT_SYMBOL(tcf_action_dump_1);
464
465 int
466 tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
467 {
468 struct tc_action *a;
469 int err = -EINVAL;
470 struct nlattr *nest;
471
472 while ((a = act) != NULL) {
473 act = a->next;
474 nest = nla_nest_start(skb, a->order);
475 if (nest == NULL)
476 goto nla_put_failure;
477 err = tcf_action_dump_1(skb, a, bind, ref);
478 if (err < 0)
479 goto errout;
480 nla_nest_end(skb, nest);
481 }
482
483 return 0;
484
485 nla_put_failure:
486 err = -EINVAL;
487 errout:
488 nla_nest_cancel(skb, nest);
489 return err;
490 }
491
492 struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
493 struct nlattr *est, char *name, int ovr,
494 int bind)
495 {
496 struct tc_action *a;
497 struct tc_action_ops *a_o;
498 char act_name[IFNAMSIZ];
499 struct nlattr *tb[TCA_ACT_MAX + 1];
500 struct nlattr *kind;
501 int err;
502
503 if (name == NULL) {
504 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
505 if (err < 0)
506 goto err_out;
507 err = -EINVAL;
508 kind = tb[TCA_ACT_KIND];
509 if (kind == NULL)
510 goto err_out;
511 if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
512 goto err_out;
513 } else {
514 err = -EINVAL;
515 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
516 goto err_out;
517 }
518
519 a_o = tc_lookup_action_n(act_name);
520 if (a_o == NULL) {
521 #ifdef CONFIG_MODULES
522 rtnl_unlock();
523 request_module("act_%s", act_name);
524 rtnl_lock();
525
526 a_o = tc_lookup_action_n(act_name);
527
528 /* We dropped the RTNL semaphore in order to
529 * perform the module load. So, even if we
530 * succeeded in loading the module we have to
531 * tell the caller to replay the request. We
532 * indicate this using -EAGAIN.
533 */
534 if (a_o != NULL) {
535 err = -EAGAIN;
536 goto err_mod;
537 }
538 #endif
539 err = -ENOENT;
540 goto err_out;
541 }
542
543 err = -ENOMEM;
544 a = kzalloc(sizeof(*a), GFP_KERNEL);
545 if (a == NULL)
546 goto err_mod;
547
548 /* backward compatibility for policer */
549 if (name == NULL)
550 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
551 else
552 err = a_o->init(net, nla, est, a, ovr, bind);
553 if (err < 0)
554 goto err_free;
555
556 /* module count goes up only when brand new policy is created
557 * if it exists and is only bound to in a_o->init() then
558 * ACT_P_CREATED is not returned (a zero is).
559 */
560 if (err != ACT_P_CREATED)
561 module_put(a_o->owner);
562 a->ops = a_o;
563
564 return a;
565
566 err_free:
567 kfree(a);
568 err_mod:
569 module_put(a_o->owner);
570 err_out:
571 return ERR_PTR(err);
572 }
573
574 struct tc_action *tcf_action_init(struct net *net, struct nlattr *nla,
575 struct nlattr *est, char *name, int ovr,
576 int bind)
577 {
578 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
579 struct tc_action *head = NULL, *act, *act_prev = NULL;
580 int err;
581 int i;
582
583 err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
584 if (err < 0)
585 return ERR_PTR(err);
586
587 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
588 act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
589 if (IS_ERR(act))
590 goto err;
591 act->order = i;
592
593 if (head == NULL)
594 head = act;
595 else
596 act_prev->next = act;
597 act_prev = act;
598 }
599 return head;
600
601 err:
602 if (head != NULL)
603 tcf_action_destroy(head, bind);
604 return act;
605 }
606
607 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
608 int compat_mode)
609 {
610 int err = 0;
611 struct gnet_dump d;
612 struct tcf_act_hdr *h = a->priv;
613
614 if (h == NULL)
615 goto errout;
616
617 /* compat_mode being true specifies a call that is supposed
618 * to add additional backward compatibility statistic TLVs.
619 */
620 if (compat_mode) {
621 if (a->type == TCA_OLD_COMPAT)
622 err = gnet_stats_start_copy_compat(skb, 0,
623 TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d);
624 else
625 return 0;
626 } else
627 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
628 &h->tcf_lock, &d);
629
630 if (err < 0)
631 goto errout;
632
633 if (a->ops != NULL && a->ops->get_stats != NULL)
634 if (a->ops->get_stats(skb, a) < 0)
635 goto errout;
636
637 if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
638 gnet_stats_copy_rate_est(&d, &h->tcf_bstats,
639 &h->tcf_rate_est) < 0 ||
640 gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
641 goto errout;
642
643 if (gnet_stats_finish_copy(&d) < 0)
644 goto errout;
645
646 return 0;
647
648 errout:
649 return -1;
650 }
651
652 static int
653 tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 portid, u32 seq,
654 u16 flags, int event, int bind, int ref)
655 {
656 struct tcamsg *t;
657 struct nlmsghdr *nlh;
658 unsigned char *b = skb_tail_pointer(skb);
659 struct nlattr *nest;
660
661 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
662 if (!nlh)
663 goto out_nlmsg_trim;
664 t = nlmsg_data(nlh);
665 t->tca_family = AF_UNSPEC;
666 t->tca__pad1 = 0;
667 t->tca__pad2 = 0;
668
669 nest = nla_nest_start(skb, TCA_ACT_TAB);
670 if (nest == NULL)
671 goto out_nlmsg_trim;
672
673 if (tcf_action_dump(skb, a, bind, ref) < 0)
674 goto out_nlmsg_trim;
675
676 nla_nest_end(skb, nest);
677
678 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
679 return skb->len;
680
681 out_nlmsg_trim:
682 nlmsg_trim(skb, b);
683 return -1;
684 }
685
686 static int
687 act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
688 struct tc_action *a, int event)
689 {
690 struct sk_buff *skb;
691
692 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
693 if (!skb)
694 return -ENOBUFS;
695 if (tca_get_fill(skb, a, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
696 kfree_skb(skb);
697 return -EINVAL;
698 }
699
700 return rtnl_unicast(skb, net, portid);
701 }
702
703 static struct tc_action *
704 tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid)
705 {
706 struct nlattr *tb[TCA_ACT_MAX + 1];
707 struct tc_action *a;
708 int index;
709 int err;
710
711 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
712 if (err < 0)
713 goto err_out;
714
715 err = -EINVAL;
716 if (tb[TCA_ACT_INDEX] == NULL ||
717 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
718 goto err_out;
719 index = nla_get_u32(tb[TCA_ACT_INDEX]);
720
721 err = -ENOMEM;
722 a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
723 if (a == NULL)
724 goto err_out;
725
726 err = -EINVAL;
727 a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
728 if (a->ops == NULL)
729 goto err_free;
730 if (a->ops->lookup == NULL)
731 goto err_mod;
732 err = -ENOENT;
733 if (a->ops->lookup(a, index) == 0)
734 goto err_mod;
735
736 module_put(a->ops->owner);
737 return a;
738
739 err_mod:
740 module_put(a->ops->owner);
741 err_free:
742 kfree(a);
743 err_out:
744 return ERR_PTR(err);
745 }
746
747 static void cleanup_a(struct tc_action *act)
748 {
749 struct tc_action *a;
750
751 for (a = act; a; a = act) {
752 act = a->next;
753 kfree(a);
754 }
755 }
756
757 static struct tc_action *create_a(int i)
758 {
759 struct tc_action *act;
760
761 act = kzalloc(sizeof(*act), GFP_KERNEL);
762 if (act == NULL) {
763 pr_debug("create_a: failed to alloc!\n");
764 return NULL;
765 }
766 act->order = i;
767 return act;
768 }
769
770 static int tca_action_flush(struct net *net, struct nlattr *nla,
771 struct nlmsghdr *n, u32 portid)
772 {
773 struct sk_buff *skb;
774 unsigned char *b;
775 struct nlmsghdr *nlh;
776 struct tcamsg *t;
777 struct netlink_callback dcb;
778 struct nlattr *nest;
779 struct nlattr *tb[TCA_ACT_MAX + 1];
780 struct nlattr *kind;
781 struct tc_action *a = create_a(0);
782 int err = -ENOMEM;
783
784 if (a == NULL) {
785 pr_debug("tca_action_flush: couldnt create tc_action\n");
786 return err;
787 }
788
789 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
790 if (!skb) {
791 pr_debug("tca_action_flush: failed skb alloc\n");
792 kfree(a);
793 return err;
794 }
795
796 b = skb_tail_pointer(skb);
797
798 err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
799 if (err < 0)
800 goto err_out;
801
802 err = -EINVAL;
803 kind = tb[TCA_ACT_KIND];
804 a->ops = tc_lookup_action(kind);
805 if (a->ops == NULL)
806 goto err_out;
807
808 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0);
809 if (!nlh)
810 goto out_module_put;
811 t = nlmsg_data(nlh);
812 t->tca_family = AF_UNSPEC;
813 t->tca__pad1 = 0;
814 t->tca__pad2 = 0;
815
816 nest = nla_nest_start(skb, TCA_ACT_TAB);
817 if (nest == NULL)
818 goto out_module_put;
819
820 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
821 if (err < 0)
822 goto out_module_put;
823 if (err == 0)
824 goto noflush_out;
825
826 nla_nest_end(skb, nest);
827
828 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
829 nlh->nlmsg_flags |= NLM_F_ROOT;
830 module_put(a->ops->owner);
831 kfree(a);
832 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
833 n->nlmsg_flags & NLM_F_ECHO);
834 if (err > 0)
835 return 0;
836
837 return err;
838
839 out_module_put:
840 module_put(a->ops->owner);
841 err_out:
842 noflush_out:
843 kfree_skb(skb);
844 kfree(a);
845 return err;
846 }
847
848 static int
849 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
850 u32 portid, int event)
851 {
852 int i, ret;
853 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
854 struct tc_action *head = NULL, *act, *act_prev = NULL;
855
856 ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
857 if (ret < 0)
858 return ret;
859
860 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
861 if (tb[1] != NULL)
862 return tca_action_flush(net, tb[1], n, portid);
863 else
864 return -EINVAL;
865 }
866
867 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
868 act = tcf_action_get_1(tb[i], n, portid);
869 if (IS_ERR(act)) {
870 ret = PTR_ERR(act);
871 goto err;
872 }
873 act->order = i;
874
875 if (head == NULL)
876 head = act;
877 else
878 act_prev->next = act;
879 act_prev = act;
880 }
881
882 if (event == RTM_GETACTION)
883 ret = act_get_notify(net, portid, n, head, event);
884 else { /* delete */
885 struct sk_buff *skb;
886
887 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
888 if (!skb) {
889 ret = -ENOBUFS;
890 goto err;
891 }
892
893 if (tca_get_fill(skb, head, portid, n->nlmsg_seq, 0, event,
894 0, 1) <= 0) {
895 kfree_skb(skb);
896 ret = -EINVAL;
897 goto err;
898 }
899
900 /* now do the delete */
901 tcf_action_destroy(head, 0);
902 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
903 n->nlmsg_flags & NLM_F_ECHO);
904 if (ret > 0)
905 return 0;
906 return ret;
907 }
908 err:
909 cleanup_a(head);
910 return ret;
911 }
912
913 static int tcf_add_notify(struct net *net, struct tc_action *a,
914 u32 portid, u32 seq, int event, u16 flags)
915 {
916 struct tcamsg *t;
917 struct nlmsghdr *nlh;
918 struct sk_buff *skb;
919 struct nlattr *nest;
920 unsigned char *b;
921 int err = 0;
922
923 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
924 if (!skb)
925 return -ENOBUFS;
926
927 b = skb_tail_pointer(skb);
928
929 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
930 if (!nlh)
931 goto out_kfree_skb;
932 t = nlmsg_data(nlh);
933 t->tca_family = AF_UNSPEC;
934 t->tca__pad1 = 0;
935 t->tca__pad2 = 0;
936
937 nest = nla_nest_start(skb, TCA_ACT_TAB);
938 if (nest == NULL)
939 goto out_kfree_skb;
940
941 if (tcf_action_dump(skb, a, 0, 0) < 0)
942 goto out_kfree_skb;
943
944 nla_nest_end(skb, nest);
945
946 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
947 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
948
949 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
950 if (err > 0)
951 err = 0;
952 return err;
953
954 out_kfree_skb:
955 kfree_skb(skb);
956 return -1;
957 }
958
959
960 static int
961 tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
962 u32 portid, int ovr)
963 {
964 int ret = 0;
965 struct tc_action *act;
966 struct tc_action *a;
967 u32 seq = n->nlmsg_seq;
968
969 act = tcf_action_init(net, nla, NULL, NULL, ovr, 0);
970 if (act == NULL)
971 goto done;
972 if (IS_ERR(act)) {
973 ret = PTR_ERR(act);
974 goto done;
975 }
976
977 /* dump then free all the actions after update; inserted policy
978 * stays intact
979 */
980 ret = tcf_add_notify(net, act, portid, seq, RTM_NEWACTION, n->nlmsg_flags);
981 for (a = act; a; a = act) {
982 act = a->next;
983 kfree(a);
984 }
985 done:
986 return ret;
987 }
988
989 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
990 {
991 struct net *net = sock_net(skb->sk);
992 struct nlattr *tca[TCA_ACT_MAX + 1];
993 u32 portid = skb ? NETLINK_CB(skb).portid : 0;
994 int ret = 0, ovr = 0;
995
996 if ((n->nlmsg_type != RTM_GETACTION) && !capable(CAP_NET_ADMIN))
997 return -EPERM;
998
999 ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL);
1000 if (ret < 0)
1001 return ret;
1002
1003 if (tca[TCA_ACT_TAB] == NULL) {
1004 pr_notice("tc_ctl_action: received NO action attribs\n");
1005 return -EINVAL;
1006 }
1007
1008 /* n->nlmsg_flags & NLM_F_CREATE */
1009 switch (n->nlmsg_type) {
1010 case RTM_NEWACTION:
1011 /* we are going to assume all other flags
1012 * imply create only if it doesn't exist
1013 * Note that CREATE | EXCL implies that
1014 * but since we want avoid ambiguity (eg when flags
1015 * is zero) then just set this
1016 */
1017 if (n->nlmsg_flags & NLM_F_REPLACE)
1018 ovr = 1;
1019 replay:
1020 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr);
1021 if (ret == -EAGAIN)
1022 goto replay;
1023 break;
1024 case RTM_DELACTION:
1025 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1026 portid, RTM_DELACTION);
1027 break;
1028 case RTM_GETACTION:
1029 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
1030 portid, RTM_GETACTION);
1031 break;
1032 default:
1033 BUG();
1034 }
1035
1036 return ret;
1037 }
1038
1039 static struct nlattr *
1040 find_dump_kind(const struct nlmsghdr *n)
1041 {
1042 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
1043 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1044 struct nlattr *nla[TCAA_MAX + 1];
1045 struct nlattr *kind;
1046
1047 if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
1048 return NULL;
1049 tb1 = nla[TCA_ACT_TAB];
1050 if (tb1 == NULL)
1051 return NULL;
1052
1053 if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1),
1054 NLMSG_ALIGN(nla_len(tb1)), NULL) < 0)
1055 return NULL;
1056
1057 if (tb[1] == NULL)
1058 return NULL;
1059 if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]),
1060 nla_len(tb[1]), NULL) < 0)
1061 return NULL;
1062 kind = tb2[TCA_ACT_KIND];
1063
1064 return kind;
1065 }
1066
1067 static int
1068 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1069 {
1070 struct nlmsghdr *nlh;
1071 unsigned char *b = skb_tail_pointer(skb);
1072 struct nlattr *nest;
1073 struct tc_action_ops *a_o;
1074 struct tc_action a;
1075 int ret = 0;
1076 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
1077 struct nlattr *kind = find_dump_kind(cb->nlh);
1078
1079 if (kind == NULL) {
1080 pr_info("tc_dump_action: action bad kind\n");
1081 return 0;
1082 }
1083
1084 a_o = tc_lookup_action(kind);
1085 if (a_o == NULL)
1086 return 0;
1087
1088 memset(&a, 0, sizeof(struct tc_action));
1089 a.ops = a_o;
1090
1091 if (a_o->walk == NULL) {
1092 WARN(1, "tc_dump_action: %s !capable of dumping table\n",
1093 a_o->kind);
1094 goto out_module_put;
1095 }
1096
1097 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1098 cb->nlh->nlmsg_type, sizeof(*t), 0);
1099 if (!nlh)
1100 goto out_module_put;
1101 t = nlmsg_data(nlh);
1102 t->tca_family = AF_UNSPEC;
1103 t->tca__pad1 = 0;
1104 t->tca__pad2 = 0;
1105
1106 nest = nla_nest_start(skb, TCA_ACT_TAB);
1107 if (nest == NULL)
1108 goto out_module_put;
1109
1110 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1111 if (ret < 0)
1112 goto out_module_put;
1113
1114 if (ret > 0) {
1115 nla_nest_end(skb, nest);
1116 ret = skb->len;
1117 } else
1118 nla_nest_cancel(skb, nest);
1119
1120 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1121 if (NETLINK_CB(cb->skb).portid && ret)
1122 nlh->nlmsg_flags |= NLM_F_MULTI;
1123 module_put(a_o->owner);
1124 return skb->len;
1125
1126 out_module_put:
1127 module_put(a_o->owner);
1128 nlmsg_trim(skb, b);
1129 return skb->len;
1130 }
1131
1132 static int __init tc_action_init(void)
1133 {
1134 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
1135 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
1136 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
1137 NULL);
1138
1139 return 0;
1140 }
1141
1142 subsys_initcall(tc_action_init);
Linux kernel - Deliverables
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