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[PKT_SCHED]: Return ENOENT if action module is unavailable
[linux-2.6-block.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>
1da177e4
LT		 17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/sched.h>
20#include <linux/string.h>
21#include <linux/mm.h>
22#include <linux/socket.h>
23#include <linux/sockios.h>
24#include <linux/in.h>
25#include <linux/errno.h>
26#include <linux/interrupt.h>
27#include <linux/netdevice.h>
28#include <linux/skbuff.h>
29#include <linux/rtnetlink.h>
30#include <linux/init.h>
31#include <linux/kmod.h>
32#include <net/sock.h>
33#include <net/sch_generic.h>
34#include <net/act_api.h>
35
2edc2689 36#if 0 /* control */
1da177e4
LT		 37#define DPRINTK(format, args...) printk(KERN_DEBUG format, ##args)
38#else
39#define DPRINTK(format, args...)
40#endif
41#if 0 /* data */
42#define D2PRINTK(format, args...) printk(KERN_DEBUG format, ##args)
43#else
44#define D2PRINTK(format, args...)
45#endif
46
47static struct tc_action_ops *act_base = NULL;
48static DEFINE_RWLOCK(act_mod_lock);
49
50int tcf_register_action(struct tc_action_ops *act)
51{
52 struct tc_action_ops *a, **ap;
53
54 write_lock(&act_mod_lock);
55 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
56 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
57 write_unlock(&act_mod_lock);
58 return -EEXIST;
59 }
60 }
61 act->next = NULL;
62 *ap = act;
63 write_unlock(&act_mod_lock);
64 return 0;
65}
66
67int tcf_unregister_action(struct tc_action_ops *act)
68{
69 struct tc_action_ops *a, **ap;
70 int err = -ENOENT;
71
72 write_lock(&act_mod_lock);
73 for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
74 if (a == act)
75 break;
76 if (a) {
77 *ap = a->next;
78 a->next = NULL;
79 err = 0;
80 }
81 write_unlock(&act_mod_lock);
82 return err;
83}
84
85/* lookup by name */
86static struct tc_action_ops *tc_lookup_action_n(char *kind)
87{
88 struct tc_action_ops *a = NULL;
89
90 if (kind) {
91 read_lock(&act_mod_lock);
92 for (a = act_base; a; a = a->next) {
93 if (strcmp(kind, a->kind) == 0) {
94 if (!try_module_get(a->owner)) {
95 read_unlock(&act_mod_lock);
96 return NULL;
97 }
98 break;
99 }
100 }
101 read_unlock(&act_mod_lock);
102 }
103 return a;
104}
105
106/* lookup by rtattr */
107static struct tc_action_ops *tc_lookup_action(struct rtattr *kind)
108{
109 struct tc_action_ops *a = NULL;
110
111 if (kind) {
112 read_lock(&act_mod_lock);
113 for (a = act_base; a; a = a->next) {
114 if (rtattr_strcmp(kind, a->kind) == 0) {
115 if (!try_module_get(a->owner)) {
116 read_unlock(&act_mod_lock);
117 return NULL;
118 }
119 break;
120 }
121 }
122 read_unlock(&act_mod_lock);
123 }
124 return a;
125}
126
127#if 0
128/* lookup by id */
129static struct tc_action_ops *tc_lookup_action_id(u32 type)
130{
131 struct tc_action_ops *a = NULL;
132
133 if (type) {
134 read_lock(&act_mod_lock);
135 for (a = act_base; a; a = a->next) {
136 if (a->type == type) {
137 if (!try_module_get(a->owner)) {
138 read_unlock(&act_mod_lock);
139 return NULL;
140 }
141 break;
142 }
143 }
144 read_unlock(&act_mod_lock);
145 }
146 return a;
147}
148#endif
149
150int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
151 struct tcf_result *res)
152{
153 struct tc_action *a;
154 int ret = -1;
155
156 if (skb->tc_verd & TC_NCLS) {
157 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
158 D2PRINTK("(%p)tcf_action_exec: cleared TC_NCLS in %s out %s\n",
159 skb, skb->input_dev ? skb->input_dev->name : "xxx",
160 skb->dev->name);
161 ret = TC_ACT_OK;
162 goto exec_done;
163 }
164 while ((a = act) != NULL) {
165repeat:
166 if (a->ops && a->ops->act) {
f43c5a0d 167 ret = a->ops->act(skb, a, res);
1da177e4
LT		 168 if (TC_MUNGED & skb->tc_verd) {
169 /* copied already, allow trampling */
170 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
171 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
172 }
1da177e4
LT		 173 if (ret == TC_ACT_REPEAT)
174 goto repeat; /* we need a ttl - JHS */
14d50e78
HS		 175 if (ret != TC_ACT_PIPE)
176 goto exec_done;
1da177e4
LT		 177 }
178 act = a->next;
179 }
180exec_done:
1da177e4
LT		 181 return ret;
182}
183
184void tcf_action_destroy(struct tc_action *act, int bind)
185{
186 struct tc_action *a;
187
188 for (a = act; a; a = act) {
189 if (a->ops && a->ops->cleanup) {
190 DPRINTK("tcf_action_destroy destroying %p next %p\n",
191 a, a->next);
192 if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
193 module_put(a->ops->owner);
194 act = act->next;
195 kfree(a);
196 } else { /*FIXME: Remove later - catch insertion bugs*/
197 printk("tcf_action_destroy: BUG? destroying NULL ops\n");
198 act = act->next;
199 kfree(a);
200 }
201 }
202}
203
204int
205tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
206{
207 int err = -EINVAL;
208
209 if (a->ops == NULL || a->ops->dump == NULL)
210 return err;
211 return a->ops->dump(skb, a, bind, ref);
212}
213
214int
215tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
216{
217 int err = -EINVAL;
218 unsigned char *b = skb->tail;
219 struct rtattr *r;
220
221 if (a->ops == NULL || a->ops->dump == NULL)
222 return err;
223
224 RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
225 if (tcf_action_copy_stats(skb, a, 0))
226 goto rtattr_failure;
227 r = (struct rtattr*) skb->tail;
228 RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
229 if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
230 r->rta_len = skb->tail - (u8*)r;
231 return err;
232 }
233
234rtattr_failure:
235 skb_trim(skb, b - skb->data);
236 return -1;
237}
238
239int
240tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
241{
242 struct tc_action *a;
243 int err = -EINVAL;
244 unsigned char *b = skb->tail;
245 struct rtattr *r ;
246
247 while ((a = act) != NULL) {
248 r = (struct rtattr*) skb->tail;
249 act = a->next;
250 RTA_PUT(skb, a->order, 0, NULL);
251 err = tcf_action_dump_1(skb, a, bind, ref);
252 if (err < 0)
253 goto rtattr_failure;
254 r->rta_len = skb->tail - (u8*)r;
255 }
256
257 return 0;
258
259rtattr_failure:
260 skb_trim(skb, b - skb->data);
261 return -err;
262}
263
264struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est,
265 char *name, int ovr, int bind, int *err)
266{
267 struct tc_action *a;
268 struct tc_action_ops *a_o;
269 char act_name[IFNAMSIZ];
270 struct rtattr *tb[TCA_ACT_MAX+1];
271 struct rtattr *kind;
272
273 *err = -EINVAL;
274
275 if (name == NULL) {
276 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
277 goto err_out;
278 kind = tb[TCA_ACT_KIND-1];
279 if (kind == NULL)
280 goto err_out;
281 if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
282 goto err_out;
283 } else {
284 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
285 goto err_out;
286 }
287
288 a_o = tc_lookup_action_n(act_name);
289 if (a_o == NULL) {
290#ifdef CONFIG_KMOD
291 rtnl_unlock();
4bba3925 292 request_module("act_%s", act_name);
1da177e4
LT		 293 rtnl_lock();
294
295 a_o = tc_lookup_action_n(act_name);
296
297 /* We dropped the RTNL semaphore in order to
298 * perform the module load. So, even if we
299 * succeeded in loading the module we have to
300 * tell the caller to replay the request. We
301 * indicate this using -EAGAIN.
302 */
303 if (a_o != NULL) {
304 *err = -EAGAIN;
305 goto err_mod;
306 }
307#endif
d152b4e1 308 *err = -ENOENT;
1da177e4
LT		 309 goto err_out;
310 }
311
312 *err = -ENOMEM;
313 a = kmalloc(sizeof(*a), GFP_KERNEL);
314 if (a == NULL)
315 goto err_mod;
316 memset(a, 0, sizeof(*a));
317
318 /* backward compatibility for policer */
319 if (name == NULL)
320 *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind);
321 else
322 *err = a_o->init(rta, est, a, ovr, bind);
323 if (*err < 0)
324 goto err_free;
325
326 /* module count goes up only when brand new policy is created
327 if it exists and is only bound to in a_o->init() then
328 ACT_P_CREATED is not returned (a zero is).
329 */
330 if (*err != ACT_P_CREATED)
331 module_put(a_o->owner);
332 a->ops = a_o;
333 DPRINTK("tcf_action_init_1: successfull %s\n", act_name);
334
335 *err = 0;
336 return a;
337
338err_free:
339 kfree(a);
340err_mod:
341 module_put(a_o->owner);
342err_out:
343 return NULL;
344}
345
346struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est,
347 char *name, int ovr, int bind, int *err)
348{
349 struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
350 struct tc_action *head = NULL, *act, *act_prev = NULL;
351 int i;
352
353 if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) {
354 *err = -EINVAL;
355 return head;
356 }
357
358 for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
359 act = tcf_action_init_1(tb[i], est, name, ovr, bind, err);
360 if (act == NULL)
361 goto err;
362 act->order = i+1;
363
364 if (head == NULL)
365 head = act;
366 else
367 act_prev->next = act;
368 act_prev = act;
369 }
370 return head;
371
372err:
373 if (head != NULL)
374 tcf_action_destroy(head, bind);
375 return NULL;
376}
377
378int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
379 int compat_mode)
380{
381 int err = 0;
382 struct gnet_dump d;
383 struct tcf_act_hdr *h = a->priv;
384
385 if (h == NULL)
386 goto errout;
387
388 /* compat_mode being true specifies a call that is supposed
389 * to add additional backward compatiblity statistic TLVs.
390 */
391 if (compat_mode) {
392 if (a->type == TCA_OLD_COMPAT)
393 err = gnet_stats_start_copy_compat(skb, 0,
394 TCA_STATS, TCA_XSTATS, h->stats_lock, &d);
395 else
396 return 0;
397 } else
398 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
399 h->stats_lock, &d);
400
401 if (err < 0)
402 goto errout;
403
404 if (a->ops != NULL && a->ops->get_stats != NULL)
405 if (a->ops->get_stats(skb, a) < 0)
406 goto errout;
407
408 if (gnet_stats_copy_basic(&d, &h->bstats) < 0 ||
409#ifdef CONFIG_NET_ESTIMATOR
410 gnet_stats_copy_rate_est(&d, &h->rate_est) < 0 ||
411#endif
412 gnet_stats_copy_queue(&d, &h->qstats) < 0)
413 goto errout;
414
415 if (gnet_stats_finish_copy(&d) < 0)
416 goto errout;
417
418 return 0;
419
420errout:
421 return -1;
422}
423
424static int
425tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
e431b8c0 426 u16 flags, int event, int bind, int ref)
1da177e4
LT		 427{
428 struct tcamsg *t;
429 struct nlmsghdr *nlh;
430 unsigned char *b = skb->tail;
431 struct rtattr *x;
432
e431b8c0
JHS		 433 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
434
1da177e4
LT		 435 t = NLMSG_DATA(nlh);
436 t->tca_family = AF_UNSPEC;
9ef1d4c7
PM		 437 t->tca__pad1 = 0;
438 t->tca__pad2 = 0;
1da177e4
LT		 439
440 x = (struct rtattr*) skb->tail;
441 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
442
443 if (tcf_action_dump(skb, a, bind, ref) < 0)
444 goto rtattr_failure;
445
446 x->rta_len = skb->tail - (u8*)x;
447
448 nlh->nlmsg_len = skb->tail - b;
449 return skb->len;
450
451rtattr_failure:
452nlmsg_failure:
453 skb_trim(skb, b - skb->data);
454 return -1;
455}
456
457static int
458act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
459{
460 struct sk_buff *skb;
461 int err = 0;
462
463 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
464 if (!skb)
465 return -ENOBUFS;
466 if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
467 kfree_skb(skb);
468 return -EINVAL;
469 }
470 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
471 if (err > 0)
472 err = 0;
473 return err;
474}
475
476static struct tc_action *
477tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err)
478{
479 struct rtattr *tb[TCA_ACT_MAX+1];
480 struct tc_action *a;
481 int index;
482
483 *err = -EINVAL;
484 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
485 return NULL;
486
487 if (tb[TCA_ACT_INDEX - 1] == NULL ||
488 RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index))
489 return NULL;
490 index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]);
491
492 *err = -ENOMEM;
493 a = kmalloc(sizeof(struct tc_action), GFP_KERNEL);
494 if (a == NULL)
495 return NULL;
496 memset(a, 0, sizeof(struct tc_action));
497
498 *err = -EINVAL;
499 a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]);
500 if (a->ops == NULL)
501 goto err_free;
502 if (a->ops->lookup == NULL)
503 goto err_mod;
504 *err = -ENOENT;
505 if (a->ops->lookup(a, index) == 0)
506 goto err_mod;
507
508 module_put(a->ops->owner);
509 *err = 0;
510 return a;
511err_mod:
512 module_put(a->ops->owner);
513err_free:
514 kfree(a);
515 return NULL;
516}
517
518static void cleanup_a(struct tc_action *act)
519{
520 struct tc_action *a;
521
522 for (a = act; a; a = act) {
523 act = a->next;
524 kfree(a);
525 }
526}
527
528static struct tc_action *create_a(int i)
529{
530 struct tc_action *act;
531
532 act = kmalloc(sizeof(*act), GFP_KERNEL);
533 if (act == NULL) {
534 printk("create_a: failed to alloc!\n");
535 return NULL;
536 }
537 memset(act, 0, sizeof(*act));
538 act->order = i;
539 return act;
540}
541
542static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid)
543{
544 struct sk_buff *skb;
545 unsigned char *b;
546 struct nlmsghdr *nlh;
547 struct tcamsg *t;
548 struct netlink_callback dcb;
549 struct rtattr *x;
550 struct rtattr *tb[TCA_ACT_MAX+1];
551 struct rtattr *kind;
552 struct tc_action *a = create_a(0);
553 int err = -EINVAL;
554
555 if (a == NULL) {
556 printk("tca_action_flush: couldnt create tc_action\n");
557 return err;
558 }
559
560 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
561 if (!skb) {
562 printk("tca_action_flush: failed skb alloc\n");
563 kfree(a);
564 return -ENOBUFS;
565 }
566
567 b = (unsigned char *)skb->tail;
568
569 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
570 goto err_out;
571
572 kind = tb[TCA_ACT_KIND-1];
573 a->ops = tc_lookup_action(kind);
574 if (a->ops == NULL)
575 goto err_out;
576
577 nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
578 t = NLMSG_DATA(nlh);
579 t->tca_family = AF_UNSPEC;
9ef1d4c7
PM		 580 t->tca__pad1 = 0;
581 t->tca__pad2 = 0;
1da177e4
LT		 582
583 x = (struct rtattr *) skb->tail;
584 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
585
586 err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
587 if (err < 0)
588 goto rtattr_failure;
589
590 x->rta_len = skb->tail - (u8 *) x;
591
592 nlh->nlmsg_len = skb->tail - b;
593 nlh->nlmsg_flags |= NLM_F_ROOT;
594 module_put(a->ops->owner);
595 kfree(a);
ac6d439d 596 err = rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
1da177e4
LT		 597 if (err > 0)
598 return 0;
599
600 return err;
601
602rtattr_failure:
603 module_put(a->ops->owner);
604nlmsg_failure:
605err_out:
606 kfree_skb(skb);
607 kfree(a);
608 return err;
609}
610
611static int
612tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event)
613{
614 int i, ret = 0;
615 struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
616 struct tc_action *head = NULL, *act, *act_prev = NULL;
617
618 if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0)
619 return -EINVAL;
620
621 if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
622 if (tb[0] != NULL && tb[1] == NULL)
623 return tca_action_flush(tb[0], n, pid);
624 }
625
626 for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
627 act = tcf_action_get_1(tb[i], n, pid, &ret);
628 if (act == NULL)
629 goto err;
630 act->order = i+1;
631
632 if (head == NULL)
633 head = act;
634 else
635 act_prev->next = act;
636 act_prev = act;
637 }
638
639 if (event == RTM_GETACTION)
640 ret = act_get_notify(pid, n, head, event);
641 else { /* delete */
642 struct sk_buff *skb;
643
644 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
645 if (!skb) {
646 ret = -ENOBUFS;
647 goto err;
648 }
649
650 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
651 0, 1) <= 0) {
652 kfree_skb(skb);
653 ret = -EINVAL;
654 goto err;
655 }
656
657 /* now do the delete */
658 tcf_action_destroy(head, 0);
ac6d439d 659 ret = rtnetlink_send(skb, pid, RTNLGRP_TC,
1da177e4
LT		 660 n->nlmsg_flags&NLM_F_ECHO);
661 if (ret > 0)
662 return 0;
663 return ret;
664 }
665err:
666 cleanup_a(head);
667 return ret;
668}
669
670static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
e431b8c0 671 u16 flags)
1da177e4
LT		 672{
673 struct tcamsg *t;
674 struct nlmsghdr *nlh;
675 struct sk_buff *skb;
676 struct rtattr *x;
677 unsigned char *b;
678 int err = 0;
679
680 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
681 if (!skb)
682 return -ENOBUFS;
683
684 b = (unsigned char *)skb->tail;
685
e431b8c0 686 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
1da177e4
LT		 687 t = NLMSG_DATA(nlh);
688 t->tca_family = AF_UNSPEC;
9ef1d4c7
PM		 689 t->tca__pad1 = 0;
690 t->tca__pad2 = 0;
691
1da177e4
LT		 692 x = (struct rtattr*) skb->tail;
693 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
694
695 if (tcf_action_dump(skb, a, 0, 0) < 0)
696 goto rtattr_failure;
697
698 x->rta_len = skb->tail - (u8*)x;
699
700 nlh->nlmsg_len = skb->tail - b;
ac6d439d 701 NETLINK_CB(skb).dst_group = RTNLGRP_TC;
1da177e4 702
ac6d439d 703 err = rtnetlink_send(skb, pid, RTNLGRP_TC, flags&NLM_F_ECHO);
1da177e4
LT		 704 if (err > 0)
705 err = 0;
706 return err;
707
708rtattr_failure:
709nlmsg_failure:
f6e57464 710 kfree_skb(skb);
1da177e4
LT		 711 return -1;
712}
713
714
715static int
716tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr)
717{
718 int ret = 0;
719 struct tc_action *act;
720 struct tc_action *a;
721 u32 seq = n->nlmsg_seq;
722
723 act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret);
724 if (act == NULL)
725 goto done;
726
727 /* dump then free all the actions after update; inserted policy
728 * stays intact
729 * */
730 ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
731 for (a = act; a; a = act) {
732 act = a->next;
733 kfree(a);
734 }
735done:
736 return ret;
737}
738
739static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
740{
741 struct rtattr **tca = arg;
742 u32 pid = skb ? NETLINK_CB(skb).pid : 0;
743 int ret = 0, ovr = 0;
744
745 if (tca[TCA_ACT_TAB-1] == NULL) {
746 printk("tc_ctl_action: received NO action attribs\n");
747 return -EINVAL;
748 }
749
750 /* n->nlmsg_flags&NLM_F_CREATE
751 * */
752 switch (n->nlmsg_type) {
753 case RTM_NEWACTION:
754 /* we are going to assume all other flags
755 * imply create only if it doesnt exist
756 * Note that CREATE | EXCL implies that
757 * but since we want avoid ambiguity (eg when flags
758 * is zero) then just set this
759 */
760 if (n->nlmsg_flags&NLM_F_REPLACE)
761 ovr = 1;
762replay:
763 ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr);
764 if (ret == -EAGAIN)
765 goto replay;
766 break;
767 case RTM_DELACTION:
768 ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION);
769 break;
770 case RTM_GETACTION:
771 ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION);
772 break;
773 default:
774 BUG();
775 }
776
777 return ret;
778}
779
26dab893 780static struct rtattr *
1da177e4
LT		 781find_dump_kind(struct nlmsghdr *n)
782{
783 struct rtattr *tb1, *tb2[TCA_ACT_MAX+1];
784 struct rtattr *tb[TCA_ACT_MAX_PRIO + 1];
785 struct rtattr *rta[TCAA_MAX + 1];
786 struct rtattr *kind;
787 int min_len = NLMSG_LENGTH(sizeof(struct tcamsg));
788 int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len);
789 struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len);
790
791 if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0)
792 return NULL;
793 tb1 = rta[TCA_ACT_TAB - 1];
794 if (tb1 == NULL)
795 return NULL;
796
797 if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1),
798 NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0)
799 return NULL;
800 if (tb[0] == NULL)
801 return NULL;
802
803 if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]),
804 RTA_PAYLOAD(tb[0])) < 0)
805 return NULL;
806 kind = tb2[TCA_ACT_KIND-1];
807
26dab893 808 return kind;
1da177e4
LT		 809}
810
811static int
812tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
813{
814 struct nlmsghdr *nlh;
815 unsigned char *b = skb->tail;
816 struct rtattr *x;
817 struct tc_action_ops *a_o;
818 struct tc_action a;
819 int ret = 0;
820 struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
26dab893 821 struct rtattr *kind = find_dump_kind(cb->nlh);
1da177e4
LT		 822
823 if (kind == NULL) {
824 printk("tc_dump_action: action bad kind\n");
825 return 0;
826 }
827
26dab893 828 a_o = tc_lookup_action(kind);
1da177e4 829 if (a_o == NULL) {
1da177e4
LT		 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) {
26dab893 837 printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind);
1da177e4
LT		 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;
9ef1d4c7
PM		 845 t->tca__pad1 = 0;
846 t->tca__pad2 = 0;
1da177e4
LT		 847
848 x = (struct rtattr *) skb->tail;
849 RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
850
851 ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
852 if (ret < 0)
853 goto rtattr_failure;
854
855 if (ret > 0) {
856 x->rta_len = skb->tail - (u8 *) x;
857 ret = skb->len;
858 } else
859 skb_trim(skb, (u8*)x - skb->data);
860
861 nlh->nlmsg_len = skb->tail - b;
862 if (NETLINK_CB(cb->skb).pid && ret)
863 nlh->nlmsg_flags |= NLM_F_MULTI;
864 module_put(a_o->owner);
865 return skb->len;
866
867rtattr_failure:
868nlmsg_failure:
869 module_put(a_o->owner);
870 skb_trim(skb, b - skb->data);
871 return skb->len;
872}
873
874static int __init tc_action_init(void)
875{
876 struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC];
877
878 if (link_p) {
879 link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action;
880 link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action;
881 link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action;
882 link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action;
883 }
884
979b6c13 885 printk("TC classifier action (bugs to netdev@vger.kernel.org cc "
1da177e4
LT		 886 "hadi@cyberus.ca)\n");
887 return 0;
888}
889
890subsys_initcall(tc_action_init);
891
892EXPORT_SYMBOL(tcf_register_action);
893EXPORT_SYMBOL(tcf_unregister_action);
894EXPORT_SYMBOL(tcf_action_exec);
895EXPORT_SYMBOL(tcf_action_dump_1);
Linux 6.x block layer and io_uring tree(s)