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[NETLINK]: Clear padding in netlink messages
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / sched / act_api.c
CommitLineData
1da177e4
LT		 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 <asm/uaccess.h>
15#include <asm/system.h>
16#include <linux/bitops.h>
17#include <linux/config.h>
18#include <linux/types.h>
19#include <linux/kernel.h>
20#include <linux/sched.h>
21#include <linux/string.h>
22#include <linux/mm.h>
23#include <linux/socket.h>
24#include <linux/sockios.h>
25#include <linux/in.h>
26#include <linux/errno.h>
27#include <linux/interrupt.h>
28#include <linux/netdevice.h>
29#include <linux/skbuff.h>
30#include <linux/rtnetlink.h>
31#include <linux/init.h>
32#include <linux/kmod.h>
33#include <net/sock.h>
34#include <net/sch_generic.h>
35#include <net/act_api.h>
36
37#if 1 /* control */
38#define DPRINTK(format, args...) printk(KERN_DEBUG format, ##args)
39#else
40#define DPRINTK(format, args...)
41#endif
42#if 0 /* data */
43#define D2PRINTK(format, args...) printk(KERN_DEBUG format, ##args)
44#else
45#define D2PRINTK(format, args...)
46#endif
47
48static struct tc_action_ops *act_base = NULL;
49static DEFINE_RWLOCK(act_mod_lock);
50
51int tcf_register_action(struct tc_action_ops *act)
52{
53 struct tc_action_ops *a, **ap;
54
55 write_lock(&act_mod_lock);
56 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
57 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
58 write_unlock(&act_mod_lock);
59 return -EEXIST;
60 }
61 }
62 act->next = NULL;
63 *ap = act;
64 write_unlock(&act_mod_lock);
65 return 0;
66}
67
68int tcf_unregister_action(struct tc_action_ops *act)
69{
70 struct tc_action_ops *a, **ap;
71 int err = -ENOENT;
72
73 write_lock(&act_mod_lock);
74 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
75 if (a == act)
76 break;
77 if (a) {
78 *ap = a->next;
79 a->next = NULL;
80 err = 0;
81 }
82 write_unlock(&act_mod_lock);
83 return err;
84}
85
86/* lookup by name */
87static struct tc_action_ops *tc_lookup_action_n(char *kind)
88{
89 struct tc_action_ops *a = NULL;
90
91 if (kind) {
92 read_lock(&act_mod_lock);
93 for (a = act_base; a; a = a->next) {
94 if (strcmp(kind, a->kind) == 0) {
95 if (!try_module_get(a->owner)) {
96 read_unlock(&act_mod_lock);
97 return NULL;
98 }
99 break;
100 }
101 }
102 read_unlock(&act_mod_lock);
103 }
104 return a;
105}
106
107/* lookup by rtattr */
108static struct tc_action_ops *tc_lookup_action(struct rtattr *kind)
109{
110 struct tc_action_ops *a = NULL;
111
112 if (kind) {
113 read_lock(&act_mod_lock);
114 for (a = act_base; a; a = a->next) {
115 if (rtattr_strcmp(kind, a->kind) == 0) {
116 if (!try_module_get(a->owner)) {
117 read_unlock(&act_mod_lock);
118 return NULL;
119 }
120 break;
121 }
122 }
123 read_unlock(&act_mod_lock);
124 }
125 return a;
126}
127
128#if 0
129/* lookup by id */
130static struct tc_action_ops *tc_lookup_action_id(u32 type)
131{
132 struct tc_action_ops *a = NULL;
133
134 if (type) {
135 read_lock(&act_mod_lock);
136 for (a = act_base; a; a = a->next) {
137 if (a->type == type) {
138 if (!try_module_get(a->owner)) {
139 read_unlock(&act_mod_lock);
140 return NULL;
141 }
142 break;
143 }
144 }
145 read_unlock(&act_mod_lock);
146 }
147 return a;
148}
149#endif
150
151int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
152 struct tcf_result *res)
153{
154 struct tc_action *a;
155 int ret = -1;
156
157 if (skb->tc_verd & TC_NCLS) {
158 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
159 D2PRINTK("(%p)tcf_action_exec: cleared TC_NCLS in %s out %s\n",
160 skb, skb->input_dev ? skb->input_dev->name : "xxx",
161 skb->dev->name);
162 ret = TC_ACT_OK;
163 goto exec_done;
164 }
165 while ((a = act) != NULL) {
166repeat:
167 if (a->ops && a->ops->act) {
168 ret = a->ops->act(&skb, a);
169 if (TC_MUNGED & skb->tc_verd) {
170 /* copied already, allow trampling */
171 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
172 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
173 }
1da177e4
LT		 174 if (ret == TC_ACT_REPEAT)
175 goto repeat; /* we need a ttl - JHS */
14d50e78
HS		 176 if (ret != TC_ACT_PIPE)
177 goto exec_done;
1da177e4
LT		 178 }
179 act = a->next;
180 }
181exec_done:
182 if (skb->tc_classid > 0) {
183 res->classid = skb->tc_classid;
184 res->class = 0;
185 skb->tc_classid = 0;
186 }
187 return ret;
188}
189
190void tcf_action_destroy(struct tc_action *act, int bind)
191{
192 struct tc_action *a;
193
194 for (a = act; a; a = act) {
195 if (a->ops && a->ops->cleanup) {
196 DPRINTK("tcf_action_destroy destroying %p next %p\n",
197 a, a->next);
198 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
199 module_put(a->ops->owner);
200 act = act->next;
201 kfree(a);
202 } else { /*FIXME: Remove later - catch insertion bugs*/
203 printk("tcf_action_destroy: BUG? destroying NULL ops\n");
204 act = act->next;
205 kfree(a);
206 }
207 }
208}
209
210int
211tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
212{
213 int err = -EINVAL;
214
215 if (a->ops == NULL || a->ops->dump == NULL)
216 return err;
217 return a->ops->dump(skb, a, bind, ref);
218}
219
220int
221tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
222{
223 int err = -EINVAL;
224 unsigned char *b = skb->tail;
225 struct rtattr *r;
226
227 if (a->ops == NULL || a->ops->dump == NULL)
228 return err;
229
230 RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
231 if (tcf_action_copy_stats(skb, a, 0))
232 goto rtattr_failure;
233 r = (struct rtattr*) skb->tail;
234 RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
235 if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
236 r->rta_len = skb->tail - (u8*)r;
237 return err;
238 }
239
240rtattr_failure:
241 skb_trim(skb, b - skb->data);
242 return -1;
243}
244
245int
246tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
247{
248 struct tc_action *a;
249 int err = -EINVAL;
250 unsigned char *b = skb->tail;
251 struct rtattr *r ;
252
253 while ((a = act) != NULL) {
254 r = (struct rtattr*) skb->tail;
255 act = a->next;
256 RTA_PUT(skb, a->order, 0, NULL);
257 err = tcf_action_dump_1(skb, a, bind, ref);
258 if (err < 0)
259 goto rtattr_failure;
260 r->rta_len = skb->tail - (u8*)r;
261 }
262
263 return 0;
264
265rtattr_failure:
266 skb_trim(skb, b - skb->data);
267 return -err;
268}
269
270struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est,
271 char *name, int ovr, int bind, int *err)
272{
273 struct tc_action *a;
274 struct tc_action_ops *a_o;
275 char act_name[IFNAMSIZ];
276 struct rtattr *tb[TCA_ACT_MAX+1];
277 struct rtattr *kind;
278
279 *err = -EINVAL;
280
281 if (name == NULL) {
282 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
283 goto err_out;
284 kind = tb[TCA_ACT_KIND-1];
285 if (kind == NULL)
286 goto err_out;
287 if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
288 goto err_out;
289 } else {
290 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
291 goto err_out;
292 }
293
294 a_o = tc_lookup_action_n(act_name);
295 if (a_o == NULL) {
296#ifdef CONFIG_KMOD
297 rtnl_unlock();
298 request_module(act_name);
299 rtnl_lock();
300
301 a_o = tc_lookup_action_n(act_name);
302
303 /* We dropped the RTNL semaphore in order to
304 * perform the module load. So, even if we
305 * succeeded in loading the module we have to
306 * tell the caller to replay the request. We
307 * indicate this using -EAGAIN.
308 */
309 if (a_o != NULL) {
310 *err = -EAGAIN;
311 goto err_mod;
312 }
313#endif
314 goto err_out;
315 }
316
317 *err = -ENOMEM;
318 a = kmalloc(sizeof(*a), GFP_KERNEL);
319 if (a == NULL)
320 goto err_mod;
321 memset(a, 0, sizeof(*a));
322
323 /* backward compatibility for policer */
324 if (name == NULL)
325 *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind);
326 else
327 *err = a_o->init(rta, est, a, ovr, bind);
328 if (*err < 0)
329 goto err_free;
330
331 /* module count goes up only when brand new policy is created
332 if it exists and is only bound to in a_o->init() then
333 ACT_P_CREATED is not returned (a zero is).
334 */
335 if (*err != ACT_P_CREATED)
336 module_put(a_o->owner);
337 a->ops = a_o;
338 DPRINTK("tcf_action_init_1: successfull %s\n", act_name);
339
340 *err = 0;
341 return a;
342
343err_free:
344 kfree(a);
345err_mod:
346 module_put(a_o->owner);
347err_out:
348 return NULL;
349}
350
351struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est,
352 char *name, int ovr, int bind, int *err)
353{
354 struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
355 struct tc_action *head = NULL, *act, *act_prev = NULL;
356 int i;
357
358 if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) {
359 *err = -EINVAL;
360 return head;
361 }
362
363 for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
364 act = tcf_action_init_1(tb[i], est, name, ovr, bind, err);
365 if (act == NULL)
366 goto err;
367 act->order = i+1;
368
369 if (head == NULL)
370 head = act;
371 else
372 act_prev->next = act;
373 act_prev = act;
374 }
375 return head;
376
377err:
378 if (head != NULL)
379 tcf_action_destroy(head, bind);
380 return NULL;
381}
382
383int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
384 int compat_mode)
385{
386 int err = 0;
387 struct gnet_dump d;
388 struct tcf_act_hdr *h = a->priv;
389
390 if (h == NULL)
391 goto errout;
392
393 /* compat_mode being true specifies a call that is supposed
394 * to add additional backward compatiblity statistic TLVs.
395 */
396 if (compat_mode) {
397 if (a->type == TCA_OLD_COMPAT)
398 err = gnet_stats_start_copy_compat(skb, 0,
399 TCA_STATS, TCA_XSTATS, h->stats_lock, &d);
400 else
401 return 0;
402 } else
403 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
404 h->stats_lock, &d);
405
406 if (err < 0)
407 goto errout;
408
409 if (a->ops != NULL && a->ops->get_stats != NULL)
410 if (a->ops->get_stats(skb, a) < 0)
411 goto errout;
412
413 if (gnet_stats_copy_basic(&d, &h->bstats) < 0 ||
414#ifdef CONFIG_NET_ESTIMATOR
415 gnet_stats_copy_rate_est(&d, &h->rate_est) < 0 ||
416#endif
417 gnet_stats_copy_queue(&d, &h->qstats) < 0)
418 goto errout;
419
420 if (gnet_stats_finish_copy(&d) < 0)
421 goto errout;
422
423 return 0;
424
425errout:
426 return -1;
427}
428
429static int
430tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
e431b8c0 431 u16 flags, int event, int bind, int ref)
1da177e4
LT		 432{
433 struct tcamsg *t;
434 struct nlmsghdr *nlh;
435 unsigned char *b = skb->tail;
436 struct rtattr *x;
437
e431b8c0
JHS		 438 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
439
1da177e4
LT		 440 t = NLMSG_DATA(nlh);
441 t->tca_family = AF_UNSPEC;
442
443 x = (struct rtattr*) skb->tail;
444 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
445
446 if (tcf_action_dump(skb, a, bind, ref) < 0)
447 goto rtattr_failure;
448
449 x->rta_len = skb->tail - (u8*)x;
450
451 nlh->nlmsg_len = skb->tail - b;
452 return skb->len;
453
454rtattr_failure:
455nlmsg_failure:
456 skb_trim(skb, b - skb->data);
457 return -1;
458}
459
460static int
461act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
462{
463 struct sk_buff *skb;
464 int err = 0;
465
466 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
467 if (!skb)
468 return -ENOBUFS;
469 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
470 kfree_skb(skb);
471 return -EINVAL;
472 }
473 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
474 if (err > 0)
475 err = 0;
476 return err;
477}
478
479static struct tc_action *
480tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err)
481{
482 struct rtattr *tb[TCA_ACT_MAX+1];
483 struct tc_action *a;
484 int index;
485
486 *err = -EINVAL;
487 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
488 return NULL;
489
490 if (tb[TCA_ACT_INDEX - 1] == NULL ||
491 RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index))
492 return NULL;
493 index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]);
494
495 *err = -ENOMEM;
496 a = kmalloc(sizeof(struct tc_action), GFP_KERNEL);
497 if (a == NULL)
498 return NULL;
499 memset(a, 0, sizeof(struct tc_action));
500
501 *err = -EINVAL;
502 a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]);
503 if (a->ops == NULL)
504 goto err_free;
505 if (a->ops->lookup == NULL)
506 goto err_mod;
507 *err = -ENOENT;
508 if (a->ops->lookup(a, index) == 0)
509 goto err_mod;
510
511 module_put(a->ops->owner);
512 *err = 0;
513 return a;
514err_mod:
515 module_put(a->ops->owner);
516err_free:
517 kfree(a);
518 return NULL;
519}
520
521static void cleanup_a(struct tc_action *act)
522{
523 struct tc_action *a;
524
525 for (a = act; a; a = act) {
526 act = a->next;
527 kfree(a);
528 }
529}
530
531static struct tc_action *create_a(int i)
532{
533 struct tc_action *act;
534
535 act = kmalloc(sizeof(*act), GFP_KERNEL);
536 if (act == NULL) {
537 printk("create_a: failed to alloc!\n");
538 return NULL;
539 }
540 memset(act, 0, sizeof(*act));
541 act->order = i;
542 return act;
543}
544
545static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid)
546{
547 struct sk_buff *skb;
548 unsigned char *b;
549 struct nlmsghdr *nlh;
550 struct tcamsg *t;
551 struct netlink_callback dcb;
552 struct rtattr *x;
553 struct rtattr *tb[TCA_ACT_MAX+1];
554 struct rtattr *kind;
555 struct tc_action *a = create_a(0);
556 int err = -EINVAL;
557
558 if (a == NULL) {
559 printk("tca_action_flush: couldnt create tc_action\n");
560 return err;
561 }
562
563 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
564 if (!skb) {
565 printk("tca_action_flush: failed skb alloc\n");
566 kfree(a);
567 return -ENOBUFS;
568 }
569
570 b = (unsigned char *)skb->tail;
571
572 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
573 goto err_out;
574
575 kind = tb[TCA_ACT_KIND-1];
576 a->ops = tc_lookup_action(kind);
577 if (a->ops == NULL)
578 goto err_out;
579
580 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
581 t = NLMSG_DATA(nlh);
582 t->tca_family = AF_UNSPEC;
583
584 x = (struct rtattr *) skb->tail;
585 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
586
587 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
588 if (err < 0)
589 goto rtattr_failure;
590
591 x->rta_len = skb->tail - (u8 *) x;
592
593 nlh->nlmsg_len = skb->tail - b;
594 nlh->nlmsg_flags |= NLM_F_ROOT;
595 module_put(a->ops->owner);
596 kfree(a);
597 err = rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
598 if (err > 0)
599 return 0;
600
601 return err;
602
603rtattr_failure:
604 module_put(a->ops->owner);
605nlmsg_failure:
606err_out:
607 kfree_skb(skb);
608 kfree(a);
609 return err;
610}
611
612static int
613tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event)
614{
615 int i, ret = 0;
616 struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
617 struct tc_action *head = NULL, *act, *act_prev = NULL;
618
619 if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0)
620 return -EINVAL;
621
622 if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
623 if (tb[0] != NULL && tb[1] == NULL)
624 return tca_action_flush(tb[0], n, pid);
625 }
626
627 for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
628 act = tcf_action_get_1(tb[i], n, pid, &ret);
629 if (act == NULL)
630 goto err;
631 act->order = i+1;
632
633 if (head == NULL)
634 head = act;
635 else
636 act_prev->next = act;
637 act_prev = act;
638 }
639
640 if (event == RTM_GETACTION)
641 ret = act_get_notify(pid, n, head, event);
642 else { /* delete */
643 struct sk_buff *skb;
644
645 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
646 if (!skb) {
647 ret = -ENOBUFS;
648 goto err;
649 }
650
651 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
652 0, 1) <= 0) {
653 kfree_skb(skb);
654 ret = -EINVAL;
655 goto err;
656 }
657
658 /* now do the delete */
659 tcf_action_destroy(head, 0);
660 ret = rtnetlink_send(skb, pid, RTMGRP_TC,
661 n->nlmsg_flags&NLM_F_ECHO);
662 if (ret > 0)
663 return 0;
664 return ret;
665 }
666err:
667 cleanup_a(head);
668 return ret;
669}
670
671static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
e431b8c0 672 u16 flags)
1da177e4
LT		 673{
674 struct tcamsg *t;
675 struct nlmsghdr *nlh;
676 struct sk_buff *skb;
677 struct rtattr *x;
678 unsigned char *b;
679 int err = 0;
680
681 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
682 if (!skb)
683 return -ENOBUFS;
684
685 b = (unsigned char *)skb->tail;
686
e431b8c0 687 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
1da177e4
LT		 688 t = NLMSG_DATA(nlh);
689 t->tca_family = AF_UNSPEC;
690
691 x = (struct rtattr*) skb->tail;
692 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
693
694 if (tcf_action_dump(skb, a, 0, 0) < 0)
695 goto rtattr_failure;
696
697 x->rta_len = skb->tail - (u8*)x;
698
699 nlh->nlmsg_len = skb->tail - b;
700 NETLINK_CB(skb).dst_groups = RTMGRP_TC;
701
702 err = rtnetlink_send(skb, pid, RTMGRP_TC, flags&NLM_F_ECHO);
703 if (err > 0)
704 err = 0;
705 return err;
706
707rtattr_failure:
708nlmsg_failure:
709 skb_trim(skb, b - skb->data);
710 return -1;
711}
712
713
714static int
715tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr)
716{
717 int ret = 0;
718 struct tc_action *act;
719 struct tc_action *a;
720 u32 seq = n->nlmsg_seq;
721
722 act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret);
723 if (act == NULL)
724 goto done;
725
726 /* dump then free all the actions after update; inserted policy
727 * stays intact
728 * */
729 ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
730 for (a = act; a; a = act) {
731 act = a->next;
732 kfree(a);
733 }
734done:
735 return ret;
736}
737
738static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
739{
740 struct rtattr **tca = arg;
741 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
742 int ret = 0, ovr = 0;
743
744 if (tca[TCA_ACT_TAB-1] == NULL) {
745 printk("tc_ctl_action: received NO action attribs\n");
746 return -EINVAL;
747 }
748
749 /* n->nlmsg_flags&NLM_F_CREATE
750 * */
751 switch (n->nlmsg_type) {
752 case RTM_NEWACTION:
753 /* we are going to assume all other flags
754 * imply create only if it doesnt exist
755 * Note that CREATE | EXCL implies that
756 * but since we want avoid ambiguity (eg when flags
757 * is zero) then just set this
758 */
759 if (n->nlmsg_flags&NLM_F_REPLACE)
760 ovr = 1;
761replay:
762 ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr);
763 if (ret == -EAGAIN)
764 goto replay;
765 break;
766 case RTM_DELACTION:
767 ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION);
768 break;
769 case RTM_GETACTION:
770 ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION);
771 break;
772 default:
773 BUG();
774 }
775
776 return ret;
777}
778
779static char *
780find_dump_kind(struct nlmsghdr *n)
781{
782 struct rtattr *tb1, *tb2[TCA_ACT_MAX+1];
783 struct rtattr *tb[TCA_ACT_MAX_PRIO + 1];
784 struct rtattr *rta[TCAA_MAX + 1];
785 struct rtattr *kind;
786 int min_len = NLMSG_LENGTH(sizeof(struct tcamsg));
787 int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len);
788 struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len);
789
790 if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0)
791 return NULL;
792 tb1 = rta[TCA_ACT_TAB - 1];
793 if (tb1 == NULL)
794 return NULL;
795
796 if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1),
797 NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0)
798 return NULL;
799 if (tb[0] == NULL)
800 return NULL;
801
802 if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]),
803 RTA_PAYLOAD(tb[0])) < 0)
804 return NULL;
805 kind = tb2[TCA_ACT_KIND-1];
806
807 return (char *) RTA_DATA(kind);
808}
809
810static int
811tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
812{
813 struct nlmsghdr *nlh;
814 unsigned char *b = skb->tail;
815 struct rtattr *x;
816 struct tc_action_ops *a_o;
817 struct tc_action a;
818 int ret = 0;
819 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
820 char *kind = find_dump_kind(cb->nlh);
821
822 if (kind == NULL) {
823 printk("tc_dump_action: action bad kind\n");
824 return 0;
825 }
826
827 a_o = tc_lookup_action_n(kind);
828 if (a_o == NULL) {
829 printk("failed to find %s\n", kind);
830 return 0;
831 }
832
833 memset(&a, 0, sizeof(struct tc_action));
834 a.ops = a_o;
835
836 if (a_o->walk == NULL) {
837 printk("tc_dump_action: %s !capable of dumping table\n", kind);
838 goto rtattr_failure;
839 }
840
841 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
842 cb->nlh->nlmsg_type, sizeof(*t));
843 t = NLMSG_DATA(nlh);
844 t->tca_family = AF_UNSPEC;
845
846 x = (struct rtattr *) skb->tail;
847 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
848
849 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
850 if (ret < 0)
851 goto rtattr_failure;
852
853 if (ret > 0) {
854 x->rta_len = skb->tail - (u8 *) x;
855 ret = skb->len;
856 } else
857 skb_trim(skb, (u8*)x - skb->data);
858
859 nlh->nlmsg_len = skb->tail - b;
860 if (NETLINK_CB(cb->skb).pid && ret)
861 nlh->nlmsg_flags |= NLM_F_MULTI;
862 module_put(a_o->owner);
863 return skb->len;
864
865rtattr_failure:
866nlmsg_failure:
867 module_put(a_o->owner);
868 skb_trim(skb, b - skb->data);
869 return skb->len;
870}
871
872static int __init tc_action_init(void)
873{
874 struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC];
875
876 if (link_p) {
877 link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action;
878 link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action;
879 link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action;
880 link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action;
881 }
882
979b6c13 883 printk("TC classifier action (bugs to netdev@vger.kernel.org cc "
1da177e4
LT		 884 "hadi@cyberus.ca)\n");
885 return 0;
886}
887
888subsys_initcall(tc_action_init);
889
890EXPORT_SYMBOL(tcf_register_action);
891EXPORT_SYMBOL(tcf_unregister_action);
892EXPORT_SYMBOL(tcf_action_exec);
893EXPORT_SYMBOL(tcf_action_dump_1);
kernel source for telekom puls (alcatel/mediatek)