net: spread __net_init, __net_exit
[linux-3.10.git] / net / core / fib_rules.c
1 /*
2  * net/core/fib_rules.c         Generic Routing Rules
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 as
6  *      published by the Free Software Foundation, version 2.
7  *
8  * Authors:     Thomas Graf <tgraf@suug.ch>
9  */
10
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/list.h>
14 #include <net/net_namespace.h>
15 #include <net/sock.h>
16 #include <net/fib_rules.h>
17
18 int fib_default_rule_add(struct fib_rules_ops *ops,
19                          u32 pref, u32 table, u32 flags)
20 {
21         struct fib_rule *r;
22
23         r = kzalloc(ops->rule_size, GFP_KERNEL);
24         if (r == NULL)
25                 return -ENOMEM;
26
27         atomic_set(&r->refcnt, 1);
28         r->action = FR_ACT_TO_TBL;
29         r->pref = pref;
30         r->table = table;
31         r->flags = flags;
32         r->fr_net = hold_net(ops->fro_net);
33
34         /* The lock is not required here, the list in unreacheable
35          * at the moment this function is called */
36         list_add_tail(&r->list, &ops->rules_list);
37         return 0;
38 }
39 EXPORT_SYMBOL(fib_default_rule_add);
40
41 static void notify_rule_change(int event, struct fib_rule *rule,
42                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
43                                u32 pid);
44
45 static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
46 {
47         struct fib_rules_ops *ops;
48
49         rcu_read_lock();
50         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
51                 if (ops->family == family) {
52                         if (!try_module_get(ops->owner))
53                                 ops = NULL;
54                         rcu_read_unlock();
55                         return ops;
56                 }
57         }
58         rcu_read_unlock();
59
60         return NULL;
61 }
62
63 static void rules_ops_put(struct fib_rules_ops *ops)
64 {
65         if (ops)
66                 module_put(ops->owner);
67 }
68
69 static void flush_route_cache(struct fib_rules_ops *ops)
70 {
71         if (ops->flush_cache)
72                 ops->flush_cache(ops);
73 }
74
75 static int __fib_rules_register(struct fib_rules_ops *ops)
76 {
77         int err = -EEXIST;
78         struct fib_rules_ops *o;
79         struct net *net;
80
81         net = ops->fro_net;
82
83         if (ops->rule_size < sizeof(struct fib_rule))
84                 return -EINVAL;
85
86         if (ops->match == NULL || ops->configure == NULL ||
87             ops->compare == NULL || ops->fill == NULL ||
88             ops->action == NULL)
89                 return -EINVAL;
90
91         spin_lock(&net->rules_mod_lock);
92         list_for_each_entry(o, &net->rules_ops, list)
93                 if (ops->family == o->family)
94                         goto errout;
95
96         hold_net(net);
97         list_add_tail_rcu(&ops->list, &net->rules_ops);
98         err = 0;
99 errout:
100         spin_unlock(&net->rules_mod_lock);
101
102         return err;
103 }
104
105 struct fib_rules_ops *
106 fib_rules_register(struct fib_rules_ops *tmpl, struct net *net)
107 {
108         struct fib_rules_ops *ops;
109         int err;
110
111         ops = kmemdup(tmpl, sizeof (*ops), GFP_KERNEL);
112         if (ops == NULL)
113                 return ERR_PTR(-ENOMEM);
114
115         INIT_LIST_HEAD(&ops->rules_list);
116         ops->fro_net = net;
117
118         err = __fib_rules_register(ops);
119         if (err) {
120                 kfree(ops);
121                 ops = ERR_PTR(err);
122         }
123
124         return ops;
125 }
126
127 EXPORT_SYMBOL_GPL(fib_rules_register);
128
129 void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
130 {
131         struct fib_rule *rule, *tmp;
132
133         list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
134                 list_del_rcu(&rule->list);
135                 fib_rule_put(rule);
136         }
137 }
138 EXPORT_SYMBOL_GPL(fib_rules_cleanup_ops);
139
140 static void fib_rules_put_rcu(struct rcu_head *head)
141 {
142         struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu);
143         struct net *net = ops->fro_net;
144
145         release_net(net);
146         kfree(ops);
147 }
148
149 void fib_rules_unregister(struct fib_rules_ops *ops)
150 {
151         struct net *net = ops->fro_net;
152
153         spin_lock(&net->rules_mod_lock);
154         list_del_rcu(&ops->list);
155         fib_rules_cleanup_ops(ops);
156         spin_unlock(&net->rules_mod_lock);
157
158         call_rcu(&ops->rcu, fib_rules_put_rcu);
159 }
160
161 EXPORT_SYMBOL_GPL(fib_rules_unregister);
162
163 static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
164                           struct flowi *fl, int flags)
165 {
166         int ret = 0;
167
168         if (rule->iifindex && (rule->iifindex != fl->iif))
169                 goto out;
170
171         if (rule->oifindex && (rule->oifindex != fl->oif))
172                 goto out;
173
174         if ((rule->mark ^ fl->mark) & rule->mark_mask)
175                 goto out;
176
177         ret = ops->match(rule, fl, flags);
178 out:
179         return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
180 }
181
182 int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
183                      int flags, struct fib_lookup_arg *arg)
184 {
185         struct fib_rule *rule;
186         int err;
187
188         rcu_read_lock();
189
190         list_for_each_entry_rcu(rule, &ops->rules_list, list) {
191 jumped:
192                 if (!fib_rule_match(rule, ops, fl, flags))
193                         continue;
194
195                 if (rule->action == FR_ACT_GOTO) {
196                         struct fib_rule *target;
197
198                         target = rcu_dereference(rule->ctarget);
199                         if (target == NULL) {
200                                 continue;
201                         } else {
202                                 rule = target;
203                                 goto jumped;
204                         }
205                 } else if (rule->action == FR_ACT_NOP)
206                         continue;
207                 else
208                         err = ops->action(rule, fl, flags, arg);
209
210                 if (err != -EAGAIN) {
211                         fib_rule_get(rule);
212                         arg->rule = rule;
213                         goto out;
214                 }
215         }
216
217         err = -ESRCH;
218 out:
219         rcu_read_unlock();
220
221         return err;
222 }
223
224 EXPORT_SYMBOL_GPL(fib_rules_lookup);
225
226 static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
227                             struct fib_rules_ops *ops)
228 {
229         int err = -EINVAL;
230
231         if (frh->src_len)
232                 if (tb[FRA_SRC] == NULL ||
233                     frh->src_len > (ops->addr_size * 8) ||
234                     nla_len(tb[FRA_SRC]) != ops->addr_size)
235                         goto errout;
236
237         if (frh->dst_len)
238                 if (tb[FRA_DST] == NULL ||
239                     frh->dst_len > (ops->addr_size * 8) ||
240                     nla_len(tb[FRA_DST]) != ops->addr_size)
241                         goto errout;
242
243         err = 0;
244 errout:
245         return err;
246 }
247
248 static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
249 {
250         struct net *net = sock_net(skb->sk);
251         struct fib_rule_hdr *frh = nlmsg_data(nlh);
252         struct fib_rules_ops *ops = NULL;
253         struct fib_rule *rule, *r, *last = NULL;
254         struct nlattr *tb[FRA_MAX+1];
255         int err = -EINVAL, unresolved = 0;
256
257         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
258                 goto errout;
259
260         ops = lookup_rules_ops(net, frh->family);
261         if (ops == NULL) {
262                 err = -EAFNOSUPPORT;
263                 goto errout;
264         }
265
266         err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
267         if (err < 0)
268                 goto errout;
269
270         err = validate_rulemsg(frh, tb, ops);
271         if (err < 0)
272                 goto errout;
273
274         rule = kzalloc(ops->rule_size, GFP_KERNEL);
275         if (rule == NULL) {
276                 err = -ENOMEM;
277                 goto errout;
278         }
279         rule->fr_net = hold_net(net);
280
281         if (tb[FRA_PRIORITY])
282                 rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
283
284         if (tb[FRA_IIFNAME]) {
285                 struct net_device *dev;
286
287                 rule->iifindex = -1;
288                 nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
289                 dev = __dev_get_by_name(net, rule->iifname);
290                 if (dev)
291                         rule->iifindex = dev->ifindex;
292         }
293
294         if (tb[FRA_OIFNAME]) {
295                 struct net_device *dev;
296
297                 rule->oifindex = -1;
298                 nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
299                 dev = __dev_get_by_name(net, rule->oifname);
300                 if (dev)
301                         rule->oifindex = dev->ifindex;
302         }
303
304         if (tb[FRA_FWMARK]) {
305                 rule->mark = nla_get_u32(tb[FRA_FWMARK]);
306                 if (rule->mark)
307                         /* compatibility: if the mark value is non-zero all bits
308                          * are compared unless a mask is explicitly specified.
309                          */
310                         rule->mark_mask = 0xFFFFFFFF;
311         }
312
313         if (tb[FRA_FWMASK])
314                 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
315
316         rule->action = frh->action;
317         rule->flags = frh->flags;
318         rule->table = frh_get_table(frh, tb);
319
320         if (!tb[FRA_PRIORITY] && ops->default_pref)
321                 rule->pref = ops->default_pref(ops);
322
323         err = -EINVAL;
324         if (tb[FRA_GOTO]) {
325                 if (rule->action != FR_ACT_GOTO)
326                         goto errout_free;
327
328                 rule->target = nla_get_u32(tb[FRA_GOTO]);
329                 /* Backward jumps are prohibited to avoid endless loops */
330                 if (rule->target <= rule->pref)
331                         goto errout_free;
332
333                 list_for_each_entry(r, &ops->rules_list, list) {
334                         if (r->pref == rule->target) {
335                                 rule->ctarget = r;
336                                 break;
337                         }
338                 }
339
340                 if (rule->ctarget == NULL)
341                         unresolved = 1;
342         } else if (rule->action == FR_ACT_GOTO)
343                 goto errout_free;
344
345         err = ops->configure(rule, skb, frh, tb);
346         if (err < 0)
347                 goto errout_free;
348
349         list_for_each_entry(r, &ops->rules_list, list) {
350                 if (r->pref > rule->pref)
351                         break;
352                 last = r;
353         }
354
355         fib_rule_get(rule);
356
357         if (ops->unresolved_rules) {
358                 /*
359                  * There are unresolved goto rules in the list, check if
360                  * any of them are pointing to this new rule.
361                  */
362                 list_for_each_entry(r, &ops->rules_list, list) {
363                         if (r->action == FR_ACT_GOTO &&
364                             r->target == rule->pref) {
365                                 BUG_ON(r->ctarget != NULL);
366                                 rcu_assign_pointer(r->ctarget, rule);
367                                 if (--ops->unresolved_rules == 0)
368                                         break;
369                         }
370                 }
371         }
372
373         if (rule->action == FR_ACT_GOTO)
374                 ops->nr_goto_rules++;
375
376         if (unresolved)
377                 ops->unresolved_rules++;
378
379         if (last)
380                 list_add_rcu(&rule->list, &last->list);
381         else
382                 list_add_rcu(&rule->list, &ops->rules_list);
383
384         notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
385         flush_route_cache(ops);
386         rules_ops_put(ops);
387         return 0;
388
389 errout_free:
390         release_net(rule->fr_net);
391         kfree(rule);
392 errout:
393         rules_ops_put(ops);
394         return err;
395 }
396
397 static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
398 {
399         struct net *net = sock_net(skb->sk);
400         struct fib_rule_hdr *frh = nlmsg_data(nlh);
401         struct fib_rules_ops *ops = NULL;
402         struct fib_rule *rule, *tmp;
403         struct nlattr *tb[FRA_MAX+1];
404         int err = -EINVAL;
405
406         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
407                 goto errout;
408
409         ops = lookup_rules_ops(net, frh->family);
410         if (ops == NULL) {
411                 err = -EAFNOSUPPORT;
412                 goto errout;
413         }
414
415         err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
416         if (err < 0)
417                 goto errout;
418
419         err = validate_rulemsg(frh, tb, ops);
420         if (err < 0)
421                 goto errout;
422
423         list_for_each_entry(rule, &ops->rules_list, list) {
424                 if (frh->action && (frh->action != rule->action))
425                         continue;
426
427                 if (frh->table && (frh_get_table(frh, tb) != rule->table))
428                         continue;
429
430                 if (tb[FRA_PRIORITY] &&
431                     (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
432                         continue;
433
434                 if (tb[FRA_IIFNAME] &&
435                     nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
436                         continue;
437
438                 if (tb[FRA_OIFNAME] &&
439                     nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
440                         continue;
441
442                 if (tb[FRA_FWMARK] &&
443                     (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
444                         continue;
445
446                 if (tb[FRA_FWMASK] &&
447                     (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
448                         continue;
449
450                 if (!ops->compare(rule, frh, tb))
451                         continue;
452
453                 if (rule->flags & FIB_RULE_PERMANENT) {
454                         err = -EPERM;
455                         goto errout;
456                 }
457
458                 list_del_rcu(&rule->list);
459
460                 if (rule->action == FR_ACT_GOTO)
461                         ops->nr_goto_rules--;
462
463                 /*
464                  * Check if this rule is a target to any of them. If so,
465                  * disable them. As this operation is eventually very
466                  * expensive, it is only performed if goto rules have
467                  * actually been added.
468                  */
469                 if (ops->nr_goto_rules > 0) {
470                         list_for_each_entry(tmp, &ops->rules_list, list) {
471                                 if (tmp->ctarget == rule) {
472                                         rcu_assign_pointer(tmp->ctarget, NULL);
473                                         ops->unresolved_rules++;
474                                 }
475                         }
476                 }
477
478                 synchronize_rcu();
479                 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
480                                    NETLINK_CB(skb).pid);
481                 fib_rule_put(rule);
482                 flush_route_cache(ops);
483                 rules_ops_put(ops);
484                 return 0;
485         }
486
487         err = -ENOENT;
488 errout:
489         rules_ops_put(ops);
490         return err;
491 }
492
493 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
494                                          struct fib_rule *rule)
495 {
496         size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
497                          + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
498                          + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
499                          + nla_total_size(4) /* FRA_PRIORITY */
500                          + nla_total_size(4) /* FRA_TABLE */
501                          + nla_total_size(4) /* FRA_FWMARK */
502                          + nla_total_size(4); /* FRA_FWMASK */
503
504         if (ops->nlmsg_payload)
505                 payload += ops->nlmsg_payload(rule);
506
507         return payload;
508 }
509
510 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
511                             u32 pid, u32 seq, int type, int flags,
512                             struct fib_rules_ops *ops)
513 {
514         struct nlmsghdr *nlh;
515         struct fib_rule_hdr *frh;
516
517         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
518         if (nlh == NULL)
519                 return -EMSGSIZE;
520
521         frh = nlmsg_data(nlh);
522         frh->table = rule->table;
523         NLA_PUT_U32(skb, FRA_TABLE, rule->table);
524         frh->res1 = 0;
525         frh->res2 = 0;
526         frh->action = rule->action;
527         frh->flags = rule->flags;
528
529         if (rule->action == FR_ACT_GOTO && rule->ctarget == NULL)
530                 frh->flags |= FIB_RULE_UNRESOLVED;
531
532         if (rule->iifname[0]) {
533                 NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname);
534
535                 if (rule->iifindex == -1)
536                         frh->flags |= FIB_RULE_IIF_DETACHED;
537         }
538
539         if (rule->oifname[0]) {
540                 NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname);
541
542                 if (rule->oifindex == -1)
543                         frh->flags |= FIB_RULE_OIF_DETACHED;
544         }
545
546         if (rule->pref)
547                 NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
548
549         if (rule->mark)
550                 NLA_PUT_U32(skb, FRA_FWMARK, rule->mark);
551
552         if (rule->mark_mask || rule->mark)
553                 NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask);
554
555         if (rule->target)
556                 NLA_PUT_U32(skb, FRA_GOTO, rule->target);
557
558         if (ops->fill(rule, skb, frh) < 0)
559                 goto nla_put_failure;
560
561         return nlmsg_end(skb, nlh);
562
563 nla_put_failure:
564         nlmsg_cancel(skb, nlh);
565         return -EMSGSIZE;
566 }
567
568 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
569                       struct fib_rules_ops *ops)
570 {
571         int idx = 0;
572         struct fib_rule *rule;
573
574         list_for_each_entry(rule, &ops->rules_list, list) {
575                 if (idx < cb->args[1])
576                         goto skip;
577
578                 if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
579                                      cb->nlh->nlmsg_seq, RTM_NEWRULE,
580                                      NLM_F_MULTI, ops) < 0)
581                         break;
582 skip:
583                 idx++;
584         }
585         cb->args[1] = idx;
586         rules_ops_put(ops);
587
588         return skb->len;
589 }
590
591 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
592 {
593         struct net *net = sock_net(skb->sk);
594         struct fib_rules_ops *ops;
595         int idx = 0, family;
596
597         family = rtnl_msg_family(cb->nlh);
598         if (family != AF_UNSPEC) {
599                 /* Protocol specific dump request */
600                 ops = lookup_rules_ops(net, family);
601                 if (ops == NULL)
602                         return -EAFNOSUPPORT;
603
604                 return dump_rules(skb, cb, ops);
605         }
606
607         rcu_read_lock();
608         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
609                 if (idx < cb->args[0] || !try_module_get(ops->owner))
610                         goto skip;
611
612                 if (dump_rules(skb, cb, ops) < 0)
613                         break;
614
615                 cb->args[1] = 0;
616         skip:
617                 idx++;
618         }
619         rcu_read_unlock();
620         cb->args[0] = idx;
621
622         return skb->len;
623 }
624
625 static void notify_rule_change(int event, struct fib_rule *rule,
626                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
627                                u32 pid)
628 {
629         struct net *net;
630         struct sk_buff *skb;
631         int err = -ENOBUFS;
632
633         net = ops->fro_net;
634         skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
635         if (skb == NULL)
636                 goto errout;
637
638         err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
639         if (err < 0) {
640                 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
641                 WARN_ON(err == -EMSGSIZE);
642                 kfree_skb(skb);
643                 goto errout;
644         }
645
646         rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
647         return;
648 errout:
649         if (err < 0)
650                 rtnl_set_sk_err(net, ops->nlgroup, err);
651 }
652
653 static void attach_rules(struct list_head *rules, struct net_device *dev)
654 {
655         struct fib_rule *rule;
656
657         list_for_each_entry(rule, rules, list) {
658                 if (rule->iifindex == -1 &&
659                     strcmp(dev->name, rule->iifname) == 0)
660                         rule->iifindex = dev->ifindex;
661                 if (rule->oifindex == -1 &&
662                     strcmp(dev->name, rule->oifname) == 0)
663                         rule->oifindex = dev->ifindex;
664         }
665 }
666
667 static void detach_rules(struct list_head *rules, struct net_device *dev)
668 {
669         struct fib_rule *rule;
670
671         list_for_each_entry(rule, rules, list) {
672                 if (rule->iifindex == dev->ifindex)
673                         rule->iifindex = -1;
674                 if (rule->oifindex == dev->ifindex)
675                         rule->oifindex = -1;
676         }
677 }
678
679
680 static int fib_rules_event(struct notifier_block *this, unsigned long event,
681                             void *ptr)
682 {
683         struct net_device *dev = ptr;
684         struct net *net = dev_net(dev);
685         struct fib_rules_ops *ops;
686
687         ASSERT_RTNL();
688         rcu_read_lock();
689
690         switch (event) {
691         case NETDEV_REGISTER:
692                 list_for_each_entry(ops, &net->rules_ops, list)
693                         attach_rules(&ops->rules_list, dev);
694                 break;
695
696         case NETDEV_UNREGISTER:
697                 list_for_each_entry(ops, &net->rules_ops, list)
698                         detach_rules(&ops->rules_list, dev);
699                 break;
700         }
701
702         rcu_read_unlock();
703
704         return NOTIFY_DONE;
705 }
706
707 static struct notifier_block fib_rules_notifier = {
708         .notifier_call = fib_rules_event,
709 };
710
711 static int __net_init fib_rules_net_init(struct net *net)
712 {
713         INIT_LIST_HEAD(&net->rules_ops);
714         spin_lock_init(&net->rules_mod_lock);
715         return 0;
716 }
717
718 static struct pernet_operations fib_rules_net_ops = {
719         .init = fib_rules_net_init,
720 };
721
722 static int __init fib_rules_init(void)
723 {
724         int err;
725         rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL);
726         rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
727         rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);
728
729         err = register_pernet_subsys(&fib_rules_net_ops);
730         if (err < 0)
731                 goto fail;
732
733         err = register_netdevice_notifier(&fib_rules_notifier);
734         if (err < 0)
735                 goto fail_unregister;
736
737         return 0;
738
739 fail_unregister:
740         unregister_pernet_subsys(&fib_rules_net_ops);
741 fail:
742         rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
743         rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
744         rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
745         return err;
746 }
747
748 subsys_initcall(fib_rules_init);