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
48 static struct tc_action_ops *act_base = NULL;
49 static DEFINE_RWLOCK(act_mod_lock);
50
51 int 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
68 int 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 */
87 static 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 */
108 static 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 */
130 static 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
151 int 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) {
166 repeat:
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 }
174 if (ret != TC_ACT_PIPE)
175 goto exec_done;
176 if (ret == TC_ACT_REPEAT)
177 goto repeat; /* we need a ttl - JHS */
178 }
179 act = a->next;
180 }
181 exec_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
190 void 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
210 int
211 tcf_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
220 int
221 tcf_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))
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
240 rtattr_failure:
241 skb_trim(skb, b - skb->data);
242 return -1;
243 }
244
245 int
246 tcf_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
265 rtattr_failure:
266 skb_trim(skb, b - skb->data);
267 return -err;
268 }
269
270 struct 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
343 err_free:
344 kfree(a);
345 err_mod:
346 module_put(a_o->owner);
347 err_out:
348 return NULL;
349 }
350
351 struct 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
377 err:
378 if (head != NULL)
379 tcf_action_destroy(head, bind);
380 return NULL;
381 }
382
383 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a)
384 {
385 int err;
386 struct gnet_dump d;
387 struct tcf_act_hdr *h = a->priv;
388
389 if (h == NULL)
390 goto errout;
391
392 if (a->type == TCA_OLD_COMPAT)
393 err = gnet_stats_start_copy_compat(skb, TCA_ACT_STATS,
394 TCA_STATS, TCA_XSTATS, h->stats_lock, &d);
395 else
396 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
397 h->stats_lock, &d);
398
399 if (err < 0)
400 goto errout;
401
402 if (a->ops != NULL && a->ops->get_stats != NULL)
403 if (a->ops->get_stats(skb, a) < 0)
404 goto errout;
405
406 if (gnet_stats_copy_basic(&d, &h->bstats) < 0 ||
407 #ifdef CONFIG_NET_ESTIMATOR
408 gnet_stats_copy_rate_est(&d, &h->rate_est) < 0 ||
409 #endif
410 gnet_stats_copy_queue(&d, &h->qstats) < 0)
411 goto errout;
412
413 if (gnet_stats_finish_copy(&d) < 0)
414 goto errout;
415
416 return 0;
417
418 errout:
419 return -1;
420 }
421
422 static int
423 tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
424 unsigned flags, int event, int bind, int ref)
425 {
426 struct tcamsg *t;
427 struct nlmsghdr *nlh;
428 unsigned char *b = skb->tail;
429 struct rtattr *x;
430
431 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*t));
432 nlh->nlmsg_flags = flags;
433 t = NLMSG_DATA(nlh);
434 t->tca_family = AF_UNSPEC;
435
436 x = (struct rtattr*) skb->tail;
437 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
438
439 if (tcf_action_dump(skb, a, bind, ref) < 0)
440 goto rtattr_failure;
441
442 x->rta_len = skb->tail - (u8*)x;
443
444 nlh->nlmsg_len = skb->tail - b;
445 return skb->len;
446
447 rtattr_failure:
448 nlmsg_failure:
449 skb_trim(skb, b - skb->data);
450 return -1;
451 }
452
453 static int
454 act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
455 {
456 struct sk_buff *skb;
457 int err = 0;
458
459 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
460 if (!skb)
461 return -ENOBUFS;
462 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
463 kfree_skb(skb);
464 return -EINVAL;
465 }
466 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
467 if (err > 0)
468 err = 0;
469 return err;
470 }
471
472 static struct tc_action *
473 tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err)
474 {
475 struct rtattr *tb[TCA_ACT_MAX+1];
476 struct tc_action *a;
477 int index;
478
479 *err = -EINVAL;
480 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
481 return NULL;
482
483 if (tb[TCA_ACT_INDEX - 1] == NULL ||
484 RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index))
485 return NULL;
486 index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]);
487
488 *err = -ENOMEM;
489 a = kmalloc(sizeof(struct tc_action), GFP_KERNEL);
490 if (a == NULL)
491 return NULL;
492 memset(a, 0, sizeof(struct tc_action));
493
494 *err = -EINVAL;
495 a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]);
496 if (a->ops == NULL)
497 goto err_free;
498 if (a->ops->lookup == NULL)
499 goto err_mod;
500 *err = -ENOENT;
501 if (a->ops->lookup(a, index) == 0)
502 goto err_mod;
503
504 module_put(a->ops->owner);
505 *err = 0;
506 return a;
507 err_mod:
508 module_put(a->ops->owner);
509 err_free:
510 kfree(a);
511 return NULL;
512 }
513
514 static void cleanup_a(struct tc_action *act)
515 {
516 struct tc_action *a;
517
518 for (a = act; a; a = act) {
519 act = a->next;
520 kfree(a);
521 }
522 }
523
524 static struct tc_action *create_a(int i)
525 {
526 struct tc_action *act;
527
528 act = kmalloc(sizeof(*act), GFP_KERNEL);
529 if (act == NULL) {
530 printk("create_a: failed to alloc!\n");
531 return NULL;
532 }
533 memset(act, 0, sizeof(*act));
534 act->order = i;
535 return act;
536 }
537
538 static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid)
539 {
540 struct sk_buff *skb;
541 unsigned char *b;
542 struct nlmsghdr *nlh;
543 struct tcamsg *t;
544 struct netlink_callback dcb;
545 struct rtattr *x;
546 struct rtattr *tb[TCA_ACT_MAX+1];
547 struct rtattr *kind;
548 struct tc_action *a = create_a(0);
549 int err = -EINVAL;
550
551 if (a == NULL) {
552 printk("tca_action_flush: couldnt create tc_action\n");
553 return err;
554 }
555
556 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
557 if (!skb) {
558 printk("tca_action_flush: failed skb alloc\n");
559 kfree(a);
560 return -ENOBUFS;
561 }
562
563 b = (unsigned char *)skb->tail;
564
565 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
566 goto err_out;
567
568 kind = tb[TCA_ACT_KIND-1];
569 a->ops = tc_lookup_action(kind);
570 if (a->ops == NULL)
571 goto err_out;
572
573 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
574 t = NLMSG_DATA(nlh);
575 t->tca_family = AF_UNSPEC;
576
577 x = (struct rtattr *) skb->tail;
578 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
579
580 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
581 if (err < 0)
582 goto rtattr_failure;
583
584 x->rta_len = skb->tail - (u8 *) x;
585
586 nlh->nlmsg_len = skb->tail - b;
587 nlh->nlmsg_flags |= NLM_F_ROOT;
588 module_put(a->ops->owner);
589 kfree(a);
590 err = rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
591 if (err > 0)
592 return 0;
593
594 return err;
595
596 rtattr_failure:
597 module_put(a->ops->owner);
598 nlmsg_failure:
599 err_out:
600 kfree_skb(skb);
601 kfree(a);
602 return err;
603 }
604
605 static int
606 tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event)
607 {
608 int i, ret = 0;
609 struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
610 struct tc_action *head = NULL, *act, *act_prev = NULL;
611
612 if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0)
613 return -EINVAL;
614
615 if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
616 if (tb[0] != NULL && tb[1] == NULL)
617 return tca_action_flush(tb[0], n, pid);
618 }
619
620 for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
621 act = tcf_action_get_1(tb[i], n, pid, &ret);
622 if (act == NULL)
623 goto err;
624 act->order = i+1;
625
626 if (head == NULL)
627 head = act;
628 else
629 act_prev->next = act;
630 act_prev = act;
631 }
632
633 if (event == RTM_GETACTION)
634 ret = act_get_notify(pid, n, head, event);
635 else { /* delete */
636 struct sk_buff *skb;
637
638 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
639 if (!skb) {
640 ret = -ENOBUFS;
641 goto err;
642 }
643
644 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
645 0, 1) <= 0) {
646 kfree_skb(skb);
647 ret = -EINVAL;
648 goto err;
649 }
650
651 /* now do the delete */
652 tcf_action_destroy(head, 0);
653 ret = rtnetlink_send(skb, pid, RTMGRP_TC,
654 n->nlmsg_flags&NLM_F_ECHO);
655 if (ret > 0)
656 return 0;
657 return ret;
658 }
659 err:
660 cleanup_a(head);
661 return ret;
662 }
663
664 static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
665 unsigned flags)
666 {
667 struct tcamsg *t;
668 struct nlmsghdr *nlh;
669 struct sk_buff *skb;
670 struct rtattr *x;
671 unsigned char *b;
672 int err = 0;
673
674 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
675 if (!skb)
676 return -ENOBUFS;
677
678 b = (unsigned char *)skb->tail;
679
680 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*t));
681 nlh->nlmsg_flags = flags;
682 t = NLMSG_DATA(nlh);
683 t->tca_family = AF_UNSPEC;
684
685 x = (struct rtattr*) skb->tail;
686 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
687
688 if (tcf_action_dump(skb, a, 0, 0) < 0)
689 goto rtattr_failure;
690
691 x->rta_len = skb->tail - (u8*)x;
692
693 nlh->nlmsg_len = skb->tail - b;
694 NETLINK_CB(skb).dst_groups = RTMGRP_TC;
695
696 err = rtnetlink_send(skb, pid, RTMGRP_TC, flags&NLM_F_ECHO);
697 if (err > 0)
698 err = 0;
699 return err;
700
701 rtattr_failure:
702 nlmsg_failure:
703 skb_trim(skb, b - skb->data);
704 return -1;
705 }
706
707
708 static int
709 tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr)
710 {
711 int ret = 0;
712 struct tc_action *act;
713 struct tc_action *a;
714 u32 seq = n->nlmsg_seq;
715
716 act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret);
717 if (act == NULL)
718 goto done;
719
720 /* dump then free all the actions after update; inserted policy
721 * stays intact
722 * */
723 ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
724 for (a = act; a; a = act) {
725 act = a->next;
726 kfree(a);
727 }
728 done:
729 return ret;
730 }
731
732 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
733 {
734 struct rtattr **tca = arg;
735 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
736 int ret = 0, ovr = 0;
737
738 if (tca[TCA_ACT_TAB-1] == NULL) {
739 printk("tc_ctl_action: received NO action attribs\n");
740 return -EINVAL;
741 }
742
743 /* n->nlmsg_flags&NLM_F_CREATE
744 * */
745 switch (n->nlmsg_type) {
746 case RTM_NEWACTION:
747 /* we are going to assume all other flags
748 * imply create only if it doesnt exist
749 * Note that CREATE | EXCL implies that
750 * but since we want avoid ambiguity (eg when flags
751 * is zero) then just set this
752 */
753 if (n->nlmsg_flags&NLM_F_REPLACE)
754 ovr = 1;
755 replay:
756 ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr);
757 if (ret == -EAGAIN)
758 goto replay;
759 break;
760 case RTM_DELACTION:
761 ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION);
762 break;
763 case RTM_GETACTION:
764 ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION);
765 break;
766 default:
767 BUG();
768 }
769
770 return ret;
771 }
772
773 static char *
774 find_dump_kind(struct nlmsghdr *n)
775 {
776 struct rtattr *tb1, *tb2[TCA_ACT_MAX+1];
777 struct rtattr *tb[TCA_ACT_MAX_PRIO + 1];
778 struct rtattr *rta[TCAA_MAX + 1];
779 struct rtattr *kind;
780 int min_len = NLMSG_LENGTH(sizeof(struct tcamsg));
781 int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len);
782 struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len);
783
784 if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0)
785 return NULL;
786 tb1 = rta[TCA_ACT_TAB - 1];
787 if (tb1 == NULL)
788 return NULL;
789
790 if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1),
791 NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0)
792 return NULL;
793 if (tb[0] == NULL)
794 return NULL;
795
796 if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]),
797 RTA_PAYLOAD(tb[0])) < 0)
798 return NULL;
799 kind = tb2[TCA_ACT_KIND-1];
800
801 return (char *) RTA_DATA(kind);
802 }
803
804 static int
805 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
806 {
807 struct nlmsghdr *nlh;
808 unsigned char *b = skb->tail;
809 struct rtattr *x;
810 struct tc_action_ops *a_o;
811 struct tc_action a;
812 int ret = 0;
813 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
814 char *kind = find_dump_kind(cb->nlh);
815
816 if (kind == NULL) {
817 printk("tc_dump_action: action bad kind\n");
818 return 0;
819 }
820
821 a_o = tc_lookup_action_n(kind);
822 if (a_o == NULL) {
823 printk("failed to find %s\n", kind);
824 return 0;
825 }
826
827 memset(&a, 0, sizeof(struct tc_action));
828 a.ops = a_o;
829
830 if (a_o->walk == NULL) {
831 printk("tc_dump_action: %s !capable of dumping table\n", kind);
832 goto rtattr_failure;
833 }
834
835 nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
836 cb->nlh->nlmsg_type, sizeof(*t));
837 t = NLMSG_DATA(nlh);
838 t->tca_family = AF_UNSPEC;
839
840 x = (struct rtattr *) skb->tail;
841 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
842
843 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
844 if (ret < 0)
845 goto rtattr_failure;
846
847 if (ret > 0) {
848 x->rta_len = skb->tail - (u8 *) x;
849 ret = skb->len;
850 } else
851 skb_trim(skb, (u8*)x - skb->data);
852
853 nlh->nlmsg_len = skb->tail - b;
854 if (NETLINK_CB(cb->skb).pid && ret)
855 nlh->nlmsg_flags |= NLM_F_MULTI;
856 module_put(a_o->owner);
857 return skb->len;
858
859 rtattr_failure:
860 nlmsg_failure:
861 module_put(a_o->owner);
862 skb_trim(skb, b - skb->data);
863 return skb->len;
864 }
865
866 static int __init tc_action_init(void)
867 {
868 struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC];
869
870 if (link_p) {
871 link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action;
872 link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action;
873 link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action;
874 link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action;
875 }
876
877 printk("TC classifier action (bugs to netdev@oss.sgi.com cc "
878 "hadi@cyberus.ca)\n");
879 return 0;
880 }
881
882 subsys_initcall(tc_action_init);
883
884 EXPORT_SYMBOL(tcf_register_action);
885 EXPORT_SYMBOL(tcf_unregister_action);
886 EXPORT_SYMBOL(tcf_action_exec);
887 EXPORT_SYMBOL(tcf_action_dump_1);
888
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