[NET] SCHED: Fix whitespace errors.
[linux-3.10.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 <asm/uaccess.h>
15 #include <asm/system.h>
16 #include <linux/bitops.h>
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
36 void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
37 {
38         unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
39         struct tcf_common **p1p;
40
41         for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) {
42                 if (*p1p == p) {
43                         write_lock_bh(hinfo->lock);
44                         *p1p = p->tcfc_next;
45                         write_unlock_bh(hinfo->lock);
46 #ifdef CONFIG_NET_ESTIMATOR
47                         gen_kill_estimator(&p->tcfc_bstats,
48                                            &p->tcfc_rate_est);
49 #endif
50                         kfree(p);
51                         return;
52                 }
53         }
54         BUG_TRAP(0);
55 }
56 EXPORT_SYMBOL(tcf_hash_destroy);
57
58 int tcf_hash_release(struct tcf_common *p, int bind,
59                      struct tcf_hashinfo *hinfo)
60 {
61         int ret = 0;
62
63         if (p) {
64                 if (bind)
65                         p->tcfc_bindcnt--;
66
67                 p->tcfc_refcnt--;
68                 if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) {
69                         tcf_hash_destroy(p, hinfo);
70                         ret = 1;
71                 }
72         }
73         return ret;
74 }
75 EXPORT_SYMBOL(tcf_hash_release);
76
77 static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
78                            struct tc_action *a, struct tcf_hashinfo *hinfo)
79 {
80         struct tcf_common *p;
81         int err = 0, index = -1,i = 0, s_i = 0, n_i = 0;
82         struct rtattr *r ;
83
84         read_lock(hinfo->lock);
85
86         s_i = cb->args[0];
87
88         for (i = 0; i < (hinfo->hmask + 1); i++) {
89                 p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
90
91                 for (; p; p = p->tcfc_next) {
92                         index++;
93                         if (index < s_i)
94                                 continue;
95                         a->priv = p;
96                         a->order = n_i;
97                         r = (struct rtattr*) skb->tail;
98                         RTA_PUT(skb, a->order, 0, NULL);
99                         err = tcf_action_dump_1(skb, a, 0, 0);
100                         if (err < 0) {
101                                 index--;
102                                 skb_trim(skb, (u8*)r - skb->data);
103                                 goto done;
104                         }
105                         r->rta_len = skb->tail - (u8*)r;
106                         n_i++;
107                         if (n_i >= TCA_ACT_MAX_PRIO)
108                                 goto done;
109                 }
110         }
111 done:
112         read_unlock(hinfo->lock);
113         if (n_i)
114                 cb->args[0] += n_i;
115         return n_i;
116
117 rtattr_failure:
118         skb_trim(skb, (u8*)r - skb->data);
119         goto done;
120 }
121
122 static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
123                           struct tcf_hashinfo *hinfo)
124 {
125         struct tcf_common *p, *s_p;
126         struct rtattr *r ;
127         int i= 0, n_i = 0;
128
129         r = (struct rtattr*) skb->tail;
130         RTA_PUT(skb, a->order, 0, NULL);
131         RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
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         RTA_PUT(skb, TCA_FCNT, 4, &n_i);
144         r->rta_len = skb->tail - (u8*)r;
145
146         return n_i;
147 rtattr_failure:
148         skb_trim(skb, (u8*)r - skb->data);
149         return -EINVAL;
150 }
151
152 int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb,
153                        int type, struct tc_action *a)
154 {
155         struct tcf_hashinfo *hinfo = a->ops->hinfo;
156
157         if (type == RTM_DELACTION) {
158                 return tcf_del_walker(skb, a, hinfo);
159         } else if (type == RTM_GETACTION) {
160                 return tcf_dump_walker(skb, cb, a, hinfo);
161         } else {
162                 printk("tcf_generic_walker: unknown action %d\n", type);
163                 return -EINVAL;
164         }
165 }
166 EXPORT_SYMBOL(tcf_generic_walker);
167
168 struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
169 {
170         struct tcf_common *p;
171
172         read_lock(hinfo->lock);
173         for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
174              p = p->tcfc_next) {
175                 if (p->tcfc_index == index)
176                         break;
177         }
178         read_unlock(hinfo->lock);
179
180         return p;
181 }
182 EXPORT_SYMBOL(tcf_hash_lookup);
183
184 u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo)
185 {
186         u32 val = *idx_gen;
187
188         do {
189                 if (++val == 0)
190                         val = 1;
191         } while (tcf_hash_lookup(val, hinfo));
192
193         return (*idx_gen = val);
194 }
195 EXPORT_SYMBOL(tcf_hash_new_index);
196
197 int tcf_hash_search(struct tc_action *a, u32 index)
198 {
199         struct tcf_hashinfo *hinfo = a->ops->hinfo;
200         struct tcf_common *p = tcf_hash_lookup(index, hinfo);
201
202         if (p) {
203                 a->priv = p;
204                 return 1;
205         }
206         return 0;
207 }
208 EXPORT_SYMBOL(tcf_hash_search);
209
210 struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind,
211                                   struct tcf_hashinfo *hinfo)
212 {
213         struct tcf_common *p = NULL;
214         if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) {
215                 if (bind) {
216                         p->tcfc_bindcnt++;
217                         p->tcfc_refcnt++;
218                 }
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 rtattr *est, struct tc_action *a, int size, int bind, u32 *idx_gen, struct tcf_hashinfo *hinfo)
226 {
227         struct tcf_common *p = kzalloc(size, GFP_KERNEL);
228
229         if (unlikely(!p))
230                 return p;
231         p->tcfc_refcnt = 1;
232         if (bind)
233                 p->tcfc_bindcnt = 1;
234
235         spin_lock_init(&p->tcfc_lock);
236         p->tcfc_stats_lock = &p->tcfc_lock;
237         p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo);
238         p->tcfc_tm.install = jiffies;
239         p->tcfc_tm.lastuse = jiffies;
240 #ifdef CONFIG_NET_ESTIMATOR
241         if (est)
242                 gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est,
243                                   p->tcfc_stats_lock, est);
244 #endif
245         a->priv = (void *) p;
246         return p;
247 }
248 EXPORT_SYMBOL(tcf_hash_create);
249
250 void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo)
251 {
252         unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask);
253
254         write_lock_bh(hinfo->lock);
255         p->tcfc_next = hinfo->htab[h];
256         hinfo->htab[h] = p;
257         write_unlock_bh(hinfo->lock);
258 }
259 EXPORT_SYMBOL(tcf_hash_insert);
260
261 static struct tc_action_ops *act_base = NULL;
262 static DEFINE_RWLOCK(act_mod_lock);
263
264 int tcf_register_action(struct tc_action_ops *act)
265 {
266         struct tc_action_ops *a, **ap;
267
268         write_lock(&act_mod_lock);
269         for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) {
270                 if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) {
271                         write_unlock(&act_mod_lock);
272                         return -EEXIST;
273                 }
274         }
275         act->next = NULL;
276         *ap = act;
277         write_unlock(&act_mod_lock);
278         return 0;
279 }
280
281 int tcf_unregister_action(struct tc_action_ops *act)
282 {
283         struct tc_action_ops *a, **ap;
284         int err = -ENOENT;
285
286         write_lock(&act_mod_lock);
287         for (ap = &act_base; (a = *ap) != NULL; ap = &a->next)
288                 if (a == act)
289                         break;
290         if (a) {
291                 *ap = a->next;
292                 a->next = NULL;
293                 err = 0;
294         }
295         write_unlock(&act_mod_lock);
296         return err;
297 }
298
299 /* lookup by name */
300 static struct tc_action_ops *tc_lookup_action_n(char *kind)
301 {
302         struct tc_action_ops *a = NULL;
303
304         if (kind) {
305                 read_lock(&act_mod_lock);
306                 for (a = act_base; a; a = a->next) {
307                         if (strcmp(kind, a->kind) == 0) {
308                                 if (!try_module_get(a->owner)) {
309                                         read_unlock(&act_mod_lock);
310                                         return NULL;
311                                 }
312                                 break;
313                         }
314                 }
315                 read_unlock(&act_mod_lock);
316         }
317         return a;
318 }
319
320 /* lookup by rtattr */
321 static struct tc_action_ops *tc_lookup_action(struct rtattr *kind)
322 {
323         struct tc_action_ops *a = NULL;
324
325         if (kind) {
326                 read_lock(&act_mod_lock);
327                 for (a = act_base; a; a = a->next) {
328                         if (rtattr_strcmp(kind, a->kind) == 0) {
329                                 if (!try_module_get(a->owner)) {
330                                         read_unlock(&act_mod_lock);
331                                         return NULL;
332                                 }
333                                 break;
334                         }
335                 }
336                 read_unlock(&act_mod_lock);
337         }
338         return a;
339 }
340
341 #if 0
342 /* lookup by id */
343 static struct tc_action_ops *tc_lookup_action_id(u32 type)
344 {
345         struct tc_action_ops *a = NULL;
346
347         if (type) {
348                 read_lock(&act_mod_lock);
349                 for (a = act_base; a; a = a->next) {
350                         if (a->type == type) {
351                                 if (!try_module_get(a->owner)) {
352                                         read_unlock(&act_mod_lock);
353                                         return NULL;
354                                 }
355                                 break;
356                         }
357                 }
358                 read_unlock(&act_mod_lock);
359         }
360         return a;
361 }
362 #endif
363
364 int tcf_action_exec(struct sk_buff *skb, struct tc_action *act,
365                     struct tcf_result *res)
366 {
367         struct tc_action *a;
368         int ret = -1;
369
370         if (skb->tc_verd & TC_NCLS) {
371                 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
372                 ret = TC_ACT_OK;
373                 goto exec_done;
374         }
375         while ((a = act) != NULL) {
376 repeat:
377                 if (a->ops && a->ops->act) {
378                         ret = a->ops->act(skb, a, res);
379                         if (TC_MUNGED & skb->tc_verd) {
380                                 /* copied already, allow trampling */
381                                 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
382                                 skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd);
383                         }
384                         if (ret == TC_ACT_REPEAT)
385                                 goto repeat;    /* we need a ttl - JHS */
386                         if (ret != TC_ACT_PIPE)
387                                 goto exec_done;
388                 }
389                 act = a->next;
390         }
391 exec_done:
392         return ret;
393 }
394
395 void tcf_action_destroy(struct tc_action *act, int bind)
396 {
397         struct tc_action *a;
398
399         for (a = act; a; a = act) {
400                 if (a->ops && a->ops->cleanup) {
401                         if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
402                                 module_put(a->ops->owner);
403                         act = act->next;
404                         kfree(a);
405                 } else { /*FIXME: Remove later - catch insertion bugs*/
406                         printk("tcf_action_destroy: BUG? destroying NULL ops\n");
407                         act = act->next;
408                         kfree(a);
409                 }
410         }
411 }
412
413 int
414 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
415 {
416         int err = -EINVAL;
417
418         if (a->ops == NULL || a->ops->dump == NULL)
419                 return err;
420         return a->ops->dump(skb, a, bind, ref);
421 }
422
423 int
424 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
425 {
426         int err = -EINVAL;
427         unsigned char *b = skb->tail;
428         struct rtattr *r;
429
430         if (a->ops == NULL || a->ops->dump == NULL)
431                 return err;
432
433         RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
434         if (tcf_action_copy_stats(skb, a, 0))
435                 goto rtattr_failure;
436         r = (struct rtattr*) skb->tail;
437         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
438         if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
439                 r->rta_len = skb->tail - (u8*)r;
440                 return err;
441         }
442
443 rtattr_failure:
444         skb_trim(skb, b - skb->data);
445         return -1;
446 }
447
448 int
449 tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
450 {
451         struct tc_action *a;
452         int err = -EINVAL;
453         unsigned char *b = skb->tail;
454         struct rtattr *r ;
455
456         while ((a = act) != NULL) {
457                 r = (struct rtattr*) skb->tail;
458                 act = a->next;
459                 RTA_PUT(skb, a->order, 0, NULL);
460                 err = tcf_action_dump_1(skb, a, bind, ref);
461                 if (err < 0)
462                         goto errout;
463                 r->rta_len = skb->tail - (u8*)r;
464         }
465
466         return 0;
467
468 rtattr_failure:
469         err = -EINVAL;
470 errout:
471         skb_trim(skb, b - skb->data);
472         return err;
473 }
474
475 struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est,
476                                     char *name, int ovr, int bind, int *err)
477 {
478         struct tc_action *a;
479         struct tc_action_ops *a_o;
480         char act_name[IFNAMSIZ];
481         struct rtattr *tb[TCA_ACT_MAX+1];
482         struct rtattr *kind;
483
484         *err = -EINVAL;
485
486         if (name == NULL) {
487                 if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
488                         goto err_out;
489                 kind = tb[TCA_ACT_KIND-1];
490                 if (kind == NULL)
491                         goto err_out;
492                 if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
493                         goto err_out;
494         } else {
495                 if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
496                         goto err_out;
497         }
498
499         a_o = tc_lookup_action_n(act_name);
500         if (a_o == NULL) {
501 #ifdef CONFIG_KMOD
502                 rtnl_unlock();
503                 request_module("act_%s", act_name);
504                 rtnl_lock();
505
506                 a_o = tc_lookup_action_n(act_name);
507
508                 /* We dropped the RTNL semaphore in order to
509                  * perform the module load.  So, even if we
510                  * succeeded in loading the module we have to
511                  * tell the caller to replay the request.  We
512                  * indicate this using -EAGAIN.
513                  */
514                 if (a_o != NULL) {
515                         *err = -EAGAIN;
516                         goto err_mod;
517                 }
518 #endif
519                 *err = -ENOENT;
520                 goto err_out;
521         }
522
523         *err = -ENOMEM;
524         a = kzalloc(sizeof(*a), GFP_KERNEL);
525         if (a == NULL)
526                 goto err_mod;
527
528         /* backward compatibility for policer */
529         if (name == NULL)
530                 *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind);
531         else
532                 *err = a_o->init(rta, est, a, ovr, bind);
533         if (*err < 0)
534                 goto err_free;
535
536         /* module count goes up only when brand new policy is created
537            if it exists and is only bound to in a_o->init() then
538            ACT_P_CREATED is not returned (a zero is).
539         */
540         if (*err != ACT_P_CREATED)
541                 module_put(a_o->owner);
542         a->ops = a_o;
543
544         *err = 0;
545         return a;
546
547 err_free:
548         kfree(a);
549 err_mod:
550         module_put(a_o->owner);
551 err_out:
552         return NULL;
553 }
554
555 struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est,
556                                   char *name, int ovr, int bind, int *err)
557 {
558         struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
559         struct tc_action *head = NULL, *act, *act_prev = NULL;
560         int i;
561
562         if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) {
563                 *err = -EINVAL;
564                 return head;
565         }
566
567         for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
568                 act = tcf_action_init_1(tb[i], est, name, ovr, bind, err);
569                 if (act == NULL)
570                         goto err;
571                 act->order = i+1;
572
573                 if (head == NULL)
574                         head = act;
575                 else
576                         act_prev->next = act;
577                 act_prev = act;
578         }
579         return head;
580
581 err:
582         if (head != NULL)
583                 tcf_action_destroy(head, bind);
584         return NULL;
585 }
586
587 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
588                           int compat_mode)
589 {
590         int err = 0;
591         struct gnet_dump d;
592         struct tcf_act_hdr *h = a->priv;
593
594         if (h == NULL)
595                 goto errout;
596
597         /* compat_mode being true specifies a call that is supposed
598          * to add additional backward compatiblity statistic TLVs.
599          */
600         if (compat_mode) {
601                 if (a->type == TCA_OLD_COMPAT)
602                         err = gnet_stats_start_copy_compat(skb, 0,
603                                 TCA_STATS, TCA_XSTATS, h->tcf_stats_lock, &d);
604                 else
605                         return 0;
606         } else
607                 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
608                         h->tcf_stats_lock, &d);
609
610         if (err < 0)
611                 goto errout;
612
613         if (a->ops != NULL && a->ops->get_stats != NULL)
614                 if (a->ops->get_stats(skb, a) < 0)
615                         goto errout;
616
617         if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 ||
618 #ifdef CONFIG_NET_ESTIMATOR
619             gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 ||
620 #endif
621             gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0)
622                 goto errout;
623
624         if (gnet_stats_finish_copy(&d) < 0)
625                 goto errout;
626
627         return 0;
628
629 errout:
630         return -1;
631 }
632
633 static int
634 tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
635              u16 flags, int event, int bind, int ref)
636 {
637         struct tcamsg *t;
638         struct nlmsghdr *nlh;
639         unsigned char *b = skb->tail;
640         struct rtattr *x;
641
642         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
643
644         t = NLMSG_DATA(nlh);
645         t->tca_family = AF_UNSPEC;
646         t->tca__pad1 = 0;
647         t->tca__pad2 = 0;
648
649         x = (struct rtattr*) skb->tail;
650         RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
651
652         if (tcf_action_dump(skb, a, bind, ref) < 0)
653                 goto rtattr_failure;
654
655         x->rta_len = skb->tail - (u8*)x;
656
657         nlh->nlmsg_len = skb->tail - b;
658         return skb->len;
659
660 rtattr_failure:
661 nlmsg_failure:
662         skb_trim(skb, b - skb->data);
663         return -1;
664 }
665
666 static int
667 act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
668 {
669         struct sk_buff *skb;
670
671         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
672         if (!skb)
673                 return -ENOBUFS;
674         if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
675                 kfree_skb(skb);
676                 return -EINVAL;
677         }
678
679         return rtnl_unicast(skb, pid);
680 }
681
682 static struct tc_action *
683 tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err)
684 {
685         struct rtattr *tb[TCA_ACT_MAX+1];
686         struct tc_action *a;
687         int index;
688
689         *err = -EINVAL;
690         if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
691                 return NULL;
692
693         if (tb[TCA_ACT_INDEX - 1] == NULL ||
694             RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index))
695                 return NULL;
696         index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]);
697
698         *err = -ENOMEM;
699         a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
700         if (a == NULL)
701                 return NULL;
702
703         *err = -EINVAL;
704         a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]);
705         if (a->ops == NULL)
706                 goto err_free;
707         if (a->ops->lookup == NULL)
708                 goto err_mod;
709         *err = -ENOENT;
710         if (a->ops->lookup(a, index) == 0)
711                 goto err_mod;
712
713         module_put(a->ops->owner);
714         *err = 0;
715         return a;
716 err_mod:
717         module_put(a->ops->owner);
718 err_free:
719         kfree(a);
720         return NULL;
721 }
722
723 static void cleanup_a(struct tc_action *act)
724 {
725         struct tc_action *a;
726
727         for (a = act; a; a = act) {
728                 act = a->next;
729                 kfree(a);
730         }
731 }
732
733 static struct tc_action *create_a(int i)
734 {
735         struct tc_action *act;
736
737         act = kzalloc(sizeof(*act), GFP_KERNEL);
738         if (act == NULL) {
739                 printk("create_a: failed to alloc!\n");
740                 return NULL;
741         }
742         act->order = i;
743         return act;
744 }
745
746 static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid)
747 {
748         struct sk_buff *skb;
749         unsigned char *b;
750         struct nlmsghdr *nlh;
751         struct tcamsg *t;
752         struct netlink_callback dcb;
753         struct rtattr *x;
754         struct rtattr *tb[TCA_ACT_MAX+1];
755         struct rtattr *kind;
756         struct tc_action *a = create_a(0);
757         int err = -EINVAL;
758
759         if (a == NULL) {
760                 printk("tca_action_flush: couldnt create tc_action\n");
761                 return err;
762         }
763
764         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
765         if (!skb) {
766                 printk("tca_action_flush: failed skb alloc\n");
767                 kfree(a);
768                 return -ENOBUFS;
769         }
770
771         b = (unsigned char *)skb->tail;
772
773         if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0)
774                 goto err_out;
775
776         kind = tb[TCA_ACT_KIND-1];
777         a->ops = tc_lookup_action(kind);
778         if (a->ops == NULL)
779                 goto err_out;
780
781         nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t));
782         t = NLMSG_DATA(nlh);
783         t->tca_family = AF_UNSPEC;
784         t->tca__pad1 = 0;
785         t->tca__pad2 = 0;
786
787         x = (struct rtattr *) skb->tail;
788         RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
789
790         err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
791         if (err < 0)
792                 goto rtattr_failure;
793
794         x->rta_len = skb->tail - (u8 *) x;
795
796         nlh->nlmsg_len = skb->tail - b;
797         nlh->nlmsg_flags |= NLM_F_ROOT;
798         module_put(a->ops->owner);
799         kfree(a);
800         err = rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
801         if (err > 0)
802                 return 0;
803
804         return err;
805
806 rtattr_failure:
807 nlmsg_failure:
808         module_put(a->ops->owner);
809 err_out:
810         kfree_skb(skb);
811         kfree(a);
812         return err;
813 }
814
815 static int
816 tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event)
817 {
818         int i, ret = 0;
819         struct rtattr *tb[TCA_ACT_MAX_PRIO+1];
820         struct tc_action *head = NULL, *act, *act_prev = NULL;
821
822         if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0)
823                 return -EINVAL;
824
825         if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
826                 if (tb[0] != NULL && tb[1] == NULL)
827                         return tca_action_flush(tb[0], n, pid);
828         }
829
830         for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) {
831                 act = tcf_action_get_1(tb[i], n, pid, &ret);
832                 if (act == NULL)
833                         goto err;
834                 act->order = i+1;
835
836                 if (head == NULL)
837                         head = act;
838                 else
839                         act_prev->next = act;
840                 act_prev = act;
841         }
842
843         if (event == RTM_GETACTION)
844                 ret = act_get_notify(pid, n, head, event);
845         else { /* delete */
846                 struct sk_buff *skb;
847
848                 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
849                 if (!skb) {
850                         ret = -ENOBUFS;
851                         goto err;
852                 }
853
854                 if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event,
855                                  0, 1) <= 0) {
856                         kfree_skb(skb);
857                         ret = -EINVAL;
858                         goto err;
859                 }
860
861                 /* now do the delete */
862                 tcf_action_destroy(head, 0);
863                 ret = rtnetlink_send(skb, pid, RTNLGRP_TC,
864                                      n->nlmsg_flags&NLM_F_ECHO);
865                 if (ret > 0)
866                         return 0;
867                 return ret;
868         }
869 err:
870         cleanup_a(head);
871         return ret;
872 }
873
874 static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
875                           u16 flags)
876 {
877         struct tcamsg *t;
878         struct nlmsghdr *nlh;
879         struct sk_buff *skb;
880         struct rtattr *x;
881         unsigned char *b;
882         int err = 0;
883
884         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
885         if (!skb)
886                 return -ENOBUFS;
887
888         b = (unsigned char *)skb->tail;
889
890         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
891         t = NLMSG_DATA(nlh);
892         t->tca_family = AF_UNSPEC;
893         t->tca__pad1 = 0;
894         t->tca__pad2 = 0;
895
896         x = (struct rtattr*) skb->tail;
897         RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
898
899         if (tcf_action_dump(skb, a, 0, 0) < 0)
900                 goto rtattr_failure;
901
902         x->rta_len = skb->tail - (u8*)x;
903
904         nlh->nlmsg_len = skb->tail - b;
905         NETLINK_CB(skb).dst_group = RTNLGRP_TC;
906
907         err = rtnetlink_send(skb, pid, RTNLGRP_TC, flags&NLM_F_ECHO);
908         if (err > 0)
909                 err = 0;
910         return err;
911
912 rtattr_failure:
913 nlmsg_failure:
914         kfree_skb(skb);
915         return -1;
916 }
917
918
919 static int
920 tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr)
921 {
922         int ret = 0;
923         struct tc_action *act;
924         struct tc_action *a;
925         u32 seq = n->nlmsg_seq;
926
927         act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret);
928         if (act == NULL)
929                 goto done;
930
931         /* dump then free all the actions after update; inserted policy
932          * stays intact
933          * */
934         ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags);
935         for (a = act; a; a = act) {
936                 act = a->next;
937                 kfree(a);
938         }
939 done:
940         return ret;
941 }
942
943 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
944 {
945         struct rtattr **tca = arg;
946         u32 pid = skb ? NETLINK_CB(skb).pid : 0;
947         int ret = 0, ovr = 0;
948
949         if (tca[TCA_ACT_TAB-1] == NULL) {
950                 printk("tc_ctl_action: received NO action attribs\n");
951                 return -EINVAL;
952         }
953
954         /* n->nlmsg_flags&NLM_F_CREATE
955          * */
956         switch (n->nlmsg_type) {
957         case RTM_NEWACTION:
958                 /* we are going to assume all other flags
959                  * imply create only if it doesnt exist
960                  * Note that CREATE | EXCL implies that
961                  * but since we want avoid ambiguity (eg when flags
962                  * is zero) then just set this
963                  */
964                 if (n->nlmsg_flags&NLM_F_REPLACE)
965                         ovr = 1;
966 replay:
967                 ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr);
968                 if (ret == -EAGAIN)
969                         goto replay;
970                 break;
971         case RTM_DELACTION:
972                 ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION);
973                 break;
974         case RTM_GETACTION:
975                 ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION);
976                 break;
977         default:
978                 BUG();
979         }
980
981         return ret;
982 }
983
984 static struct rtattr *
985 find_dump_kind(struct nlmsghdr *n)
986 {
987         struct rtattr *tb1, *tb2[TCA_ACT_MAX+1];
988         struct rtattr *tb[TCA_ACT_MAX_PRIO + 1];
989         struct rtattr *rta[TCAA_MAX + 1];
990         struct rtattr *kind;
991         int min_len = NLMSG_LENGTH(sizeof(struct tcamsg));
992         int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len);
993         struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len);
994
995         if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0)
996                 return NULL;
997         tb1 = rta[TCA_ACT_TAB - 1];
998         if (tb1 == NULL)
999                 return NULL;
1000
1001         if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1),
1002                          NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0)
1003                 return NULL;
1004         if (tb[0] == NULL)
1005                 return NULL;
1006
1007         if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]),
1008                          RTA_PAYLOAD(tb[0])) < 0)
1009                 return NULL;
1010         kind = tb2[TCA_ACT_KIND-1];
1011
1012         return kind;
1013 }
1014
1015 static int
1016 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
1017 {
1018         struct nlmsghdr *nlh;
1019         unsigned char *b = skb->tail;
1020         struct rtattr *x;
1021         struct tc_action_ops *a_o;
1022         struct tc_action a;
1023         int ret = 0;
1024         struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
1025         struct rtattr *kind = find_dump_kind(cb->nlh);
1026
1027         if (kind == NULL) {
1028                 printk("tc_dump_action: action bad kind\n");
1029                 return 0;
1030         }
1031
1032         a_o = tc_lookup_action(kind);
1033         if (a_o == NULL) {
1034                 return 0;
1035         }
1036
1037         memset(&a, 0, sizeof(struct tc_action));
1038         a.ops = a_o;
1039
1040         if (a_o->walk == NULL) {
1041                 printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind);
1042                 goto rtattr_failure;
1043         }
1044
1045         nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
1046                         cb->nlh->nlmsg_type, sizeof(*t));
1047         t = NLMSG_DATA(nlh);
1048         t->tca_family = AF_UNSPEC;
1049         t->tca__pad1 = 0;
1050         t->tca__pad2 = 0;
1051
1052         x = (struct rtattr *) skb->tail;
1053         RTA_PUT(skb, TCA_ACT_TAB, 0, NULL);
1054
1055         ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
1056         if (ret < 0)
1057                 goto rtattr_failure;
1058
1059         if (ret > 0) {
1060                 x->rta_len = skb->tail - (u8 *) x;
1061                 ret = skb->len;
1062         } else
1063                 skb_trim(skb, (u8*)x - skb->data);
1064
1065         nlh->nlmsg_len = skb->tail - b;
1066         if (NETLINK_CB(cb->skb).pid && ret)
1067                 nlh->nlmsg_flags |= NLM_F_MULTI;
1068         module_put(a_o->owner);
1069         return skb->len;
1070
1071 rtattr_failure:
1072 nlmsg_failure:
1073         module_put(a_o->owner);
1074         skb_trim(skb, b - skb->data);
1075         return skb->len;
1076 }
1077
1078 static int __init tc_action_init(void)
1079 {
1080         struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC];
1081
1082         if (link_p) {
1083                 link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action;
1084                 link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action;
1085                 link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action;
1086                 link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action;
1087         }
1088
1089         return 0;
1090 }
1091
1092 subsys_initcall(tc_action_init);
1093
1094 EXPORT_SYMBOL(tcf_register_action);
1095 EXPORT_SYMBOL(tcf_unregister_action);
1096 EXPORT_SYMBOL(tcf_action_exec);
1097 EXPORT_SYMBOL(tcf_action_dump_1);