scm: lower SCM_MAX_FD
[linux-2.6.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/slab.h>
14 #include <linux/list.h>
15 #include <net/net_namespace.h>
16 #include <net/sock.h>
17 #include <net/fib_rules.h>
18
19 int fib_default_rule_add(struct fib_rules_ops *ops,
20                          u32 pref, u32 table, u32 flags)
21 {
22         struct fib_rule *r;
23
24         r = kzalloc(ops->rule_size, GFP_KERNEL);
25         if (r == NULL)
26                 return -ENOMEM;
27
28         atomic_set(&r->refcnt, 1);
29         r->action = FR_ACT_TO_TBL;
30         r->pref = pref;
31         r->table = table;
32         r->flags = flags;
33         r->fr_net = hold_net(ops->fro_net);
34
35         /* The lock is not required here, the list in unreacheable
36          * at the moment this function is called */
37         list_add_tail(&r->list, &ops->rules_list);
38         return 0;
39 }
40 EXPORT_SYMBOL(fib_default_rule_add);
41
42 u32 fib_default_rule_pref(struct fib_rules_ops *ops)
43 {
44         struct list_head *pos;
45         struct fib_rule *rule;
46
47         if (!list_empty(&ops->rules_list)) {
48                 pos = ops->rules_list.next;
49                 if (pos->next != &ops->rules_list) {
50                         rule = list_entry(pos->next, struct fib_rule, list);
51                         if (rule->pref)
52                                 return rule->pref - 1;
53                 }
54         }
55
56         return 0;
57 }
58 EXPORT_SYMBOL(fib_default_rule_pref);
59
60 static void notify_rule_change(int event, struct fib_rule *rule,
61                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
62                                u32 pid);
63
64 static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
65 {
66         struct fib_rules_ops *ops;
67
68         rcu_read_lock();
69         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
70                 if (ops->family == family) {
71                         if (!try_module_get(ops->owner))
72                                 ops = NULL;
73                         rcu_read_unlock();
74                         return ops;
75                 }
76         }
77         rcu_read_unlock();
78
79         return NULL;
80 }
81
82 static void rules_ops_put(struct fib_rules_ops *ops)
83 {
84         if (ops)
85                 module_put(ops->owner);
86 }
87
88 static void flush_route_cache(struct fib_rules_ops *ops)
89 {
90         if (ops->flush_cache)
91                 ops->flush_cache(ops);
92 }
93
94 static int __fib_rules_register(struct fib_rules_ops *ops)
95 {
96         int err = -EEXIST;
97         struct fib_rules_ops *o;
98         struct net *net;
99
100         net = ops->fro_net;
101
102         if (ops->rule_size < sizeof(struct fib_rule))
103                 return -EINVAL;
104
105         if (ops->match == NULL || ops->configure == NULL ||
106             ops->compare == NULL || ops->fill == NULL ||
107             ops->action == NULL)
108                 return -EINVAL;
109
110         spin_lock(&net->rules_mod_lock);
111         list_for_each_entry(o, &net->rules_ops, list)
112                 if (ops->family == o->family)
113                         goto errout;
114
115         hold_net(net);
116         list_add_tail_rcu(&ops->list, &net->rules_ops);
117         err = 0;
118 errout:
119         spin_unlock(&net->rules_mod_lock);
120
121         return err;
122 }
123
124 struct fib_rules_ops *
125 fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
126 {
127         struct fib_rules_ops *ops;
128         int err;
129
130         ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
131         if (ops == NULL)
132                 return ERR_PTR(-ENOMEM);
133
134         INIT_LIST_HEAD(&ops->rules_list);
135         ops->fro_net = net;
136
137         err = __fib_rules_register(ops);
138         if (err) {
139                 kfree(ops);
140                 ops = ERR_PTR(err);
141         }
142
143         return ops;
144 }
145 EXPORT_SYMBOL_GPL(fib_rules_register);
146
147 static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
148 {
149         struct fib_rule *rule, *tmp;
150
151         list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
152                 list_del_rcu(&rule->list);
153                 fib_rule_put(rule);
154         }
155 }
156
157 static void fib_rules_put_rcu(struct rcu_head *head)
158 {
159         struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu);
160         struct net *net = ops->fro_net;
161
162         release_net(net);
163         kfree(ops);
164 }
165
166 void fib_rules_unregister(struct fib_rules_ops *ops)
167 {
168         struct net *net = ops->fro_net;
169
170         spin_lock(&net->rules_mod_lock);
171         list_del_rcu(&ops->list);
172         fib_rules_cleanup_ops(ops);
173         spin_unlock(&net->rules_mod_lock);
174
175         call_rcu(&ops->rcu, fib_rules_put_rcu);
176 }
177 EXPORT_SYMBOL_GPL(fib_rules_unregister);
178
179 static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
180                           struct flowi *fl, int flags)
181 {
182         int ret = 0;
183
184         if (rule->iifindex && (rule->iifindex != fl->iif) &&
185             !(fl->flags & FLOWI_FLAG_MATCH_ANY_IIF))
186                 goto out;
187
188         if (rule->oifindex && (rule->oifindex != fl->oif))
189                 goto out;
190
191         if ((rule->mark ^ fl->mark) & rule->mark_mask)
192                 goto out;
193
194         ret = ops->match(rule, fl, flags);
195 out:
196         return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
197 }
198
199 int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
200                      int flags, struct fib_lookup_arg *arg)
201 {
202         struct fib_rule *rule;
203         int err;
204
205         rcu_read_lock();
206
207         list_for_each_entry_rcu(rule, &ops->rules_list, list) {
208 jumped:
209                 if (!fib_rule_match(rule, ops, fl, flags))
210                         continue;
211
212                 if (rule->action == FR_ACT_GOTO) {
213                         struct fib_rule *target;
214
215                         target = rcu_dereference(rule->ctarget);
216                         if (target == NULL) {
217                                 continue;
218                         } else {
219                                 rule = target;
220                                 goto jumped;
221                         }
222                 } else if (rule->action == FR_ACT_NOP)
223                         continue;
224                 else
225                         err = ops->action(rule, fl, flags, arg);
226
227                 if (err != -EAGAIN) {
228                         if ((arg->flags & FIB_LOOKUP_NOREF) ||
229                             likely(atomic_inc_not_zero(&rule->refcnt))) {
230                                 arg->rule = rule;
231                                 goto out;
232                         }
233                         break;
234                 }
235         }
236
237         err = -ESRCH;
238 out:
239         rcu_read_unlock();
240
241         return err;
242 }
243 EXPORT_SYMBOL_GPL(fib_rules_lookup);
244
245 static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
246                             struct fib_rules_ops *ops)
247 {
248         int err = -EINVAL;
249
250         if (frh->src_len)
251                 if (tb[FRA_SRC] == NULL ||
252                     frh->src_len > (ops->addr_size * 8) ||
253                     nla_len(tb[FRA_SRC]) != ops->addr_size)
254                         goto errout;
255
256         if (frh->dst_len)
257                 if (tb[FRA_DST] == NULL ||
258                     frh->dst_len > (ops->addr_size * 8) ||
259                     nla_len(tb[FRA_DST]) != ops->addr_size)
260                         goto errout;
261
262         err = 0;
263 errout:
264         return err;
265 }
266
267 static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
268 {
269         struct net *net = sock_net(skb->sk);
270         struct fib_rule_hdr *frh = nlmsg_data(nlh);
271         struct fib_rules_ops *ops = NULL;
272         struct fib_rule *rule, *r, *last = NULL;
273         struct nlattr *tb[FRA_MAX+1];
274         int err = -EINVAL, unresolved = 0;
275
276         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
277                 goto errout;
278
279         ops = lookup_rules_ops(net, frh->family);
280         if (ops == NULL) {
281                 err = -EAFNOSUPPORT;
282                 goto errout;
283         }
284
285         err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
286         if (err < 0)
287                 goto errout;
288
289         err = validate_rulemsg(frh, tb, ops);
290         if (err < 0)
291                 goto errout;
292
293         rule = kzalloc(ops->rule_size, GFP_KERNEL);
294         if (rule == NULL) {
295                 err = -ENOMEM;
296                 goto errout;
297         }
298         rule->fr_net = hold_net(net);
299
300         if (tb[FRA_PRIORITY])
301                 rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
302
303         if (tb[FRA_IIFNAME]) {
304                 struct net_device *dev;
305
306                 rule->iifindex = -1;
307                 nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
308                 dev = __dev_get_by_name(net, rule->iifname);
309                 if (dev)
310                         rule->iifindex = dev->ifindex;
311         }
312
313         if (tb[FRA_OIFNAME]) {
314                 struct net_device *dev;
315
316                 rule->oifindex = -1;
317                 nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
318                 dev = __dev_get_by_name(net, rule->oifname);
319                 if (dev)
320                         rule->oifindex = dev->ifindex;
321         }
322
323         if (tb[FRA_FWMARK]) {
324                 rule->mark = nla_get_u32(tb[FRA_FWMARK]);
325                 if (rule->mark)
326                         /* compatibility: if the mark value is non-zero all bits
327                          * are compared unless a mask is explicitly specified.
328                          */
329                         rule->mark_mask = 0xFFFFFFFF;
330         }
331
332         if (tb[FRA_FWMASK])
333                 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
334
335         rule->action = frh->action;
336         rule->flags = frh->flags;
337         rule->table = frh_get_table(frh, tb);
338
339         if (!tb[FRA_PRIORITY] && ops->default_pref)
340                 rule->pref = ops->default_pref(ops);
341
342         err = -EINVAL;
343         if (tb[FRA_GOTO]) {
344                 if (rule->action != FR_ACT_GOTO)
345                         goto errout_free;
346
347                 rule->target = nla_get_u32(tb[FRA_GOTO]);
348                 /* Backward jumps are prohibited to avoid endless loops */
349                 if (rule->target <= rule->pref)
350                         goto errout_free;
351
352                 list_for_each_entry(r, &ops->rules_list, list) {
353                         if (r->pref == rule->target) {
354                                 RCU_INIT_POINTER(rule->ctarget, r);
355                                 break;
356                         }
357                 }
358
359                 if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
360                         unresolved = 1;
361         } else if (rule->action == FR_ACT_GOTO)
362                 goto errout_free;
363
364         err = ops->configure(rule, skb, frh, tb);
365         if (err < 0)
366                 goto errout_free;
367
368         list_for_each_entry(r, &ops->rules_list, list) {
369                 if (r->pref > rule->pref)
370                         break;
371                 last = r;
372         }
373
374         fib_rule_get(rule);
375
376         if (last)
377                 list_add_rcu(&rule->list, &last->list);
378         else
379                 list_add_rcu(&rule->list, &ops->rules_list);
380
381         if (ops->unresolved_rules) {
382                 /*
383                  * There are unresolved goto rules in the list, check if
384                  * any of them are pointing to this new rule.
385                  */
386                 list_for_each_entry(r, &ops->rules_list, list) {
387                         if (r->action == FR_ACT_GOTO &&
388                             r->target == rule->pref) {
389                                 BUG_ON(rtnl_dereference(r->ctarget) != NULL);
390                                 rcu_assign_pointer(r->ctarget, rule);
391                                 if (--ops->unresolved_rules == 0)
392                                         break;
393                         }
394                 }
395         }
396
397         if (rule->action == FR_ACT_GOTO)
398                 ops->nr_goto_rules++;
399
400         if (unresolved)
401                 ops->unresolved_rules++;
402
403         notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
404         flush_route_cache(ops);
405         rules_ops_put(ops);
406         return 0;
407
408 errout_free:
409         release_net(rule->fr_net);
410         kfree(rule);
411 errout:
412         rules_ops_put(ops);
413         return err;
414 }
415
416 static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
417 {
418         struct net *net = sock_net(skb->sk);
419         struct fib_rule_hdr *frh = nlmsg_data(nlh);
420         struct fib_rules_ops *ops = NULL;
421         struct fib_rule *rule, *tmp;
422         struct nlattr *tb[FRA_MAX+1];
423         int err = -EINVAL;
424
425         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
426                 goto errout;
427
428         ops = lookup_rules_ops(net, frh->family);
429         if (ops == NULL) {
430                 err = -EAFNOSUPPORT;
431                 goto errout;
432         }
433
434         err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
435         if (err < 0)
436                 goto errout;
437
438         err = validate_rulemsg(frh, tb, ops);
439         if (err < 0)
440                 goto errout;
441
442         list_for_each_entry(rule, &ops->rules_list, list) {
443                 if (frh->action && (frh->action != rule->action))
444                         continue;
445
446                 if (frh->table && (frh_get_table(frh, tb) != rule->table))
447                         continue;
448
449                 if (tb[FRA_PRIORITY] &&
450                     (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
451                         continue;
452
453                 if (tb[FRA_IIFNAME] &&
454                     nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
455                         continue;
456
457                 if (tb[FRA_OIFNAME] &&
458                     nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
459                         continue;
460
461                 if (tb[FRA_FWMARK] &&
462                     (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
463                         continue;
464
465                 if (tb[FRA_FWMASK] &&
466                     (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
467                         continue;
468
469                 if (!ops->compare(rule, frh, tb))
470                         continue;
471
472                 if (rule->flags & FIB_RULE_PERMANENT) {
473                         err = -EPERM;
474                         goto errout;
475                 }
476
477                 list_del_rcu(&rule->list);
478
479                 if (rule->action == FR_ACT_GOTO)
480                         ops->nr_goto_rules--;
481
482                 /*
483                  * Check if this rule is a target to any of them. If so,
484                  * disable them. As this operation is eventually very
485                  * expensive, it is only performed if goto rules have
486                  * actually been added.
487                  */
488                 if (ops->nr_goto_rules > 0) {
489                         list_for_each_entry(tmp, &ops->rules_list, list) {
490                                 if (rtnl_dereference(tmp->ctarget) == rule) {
491                                         rcu_assign_pointer(tmp->ctarget, NULL);
492                                         ops->unresolved_rules++;
493                                 }
494                         }
495                 }
496
497                 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
498                                    NETLINK_CB(skb).pid);
499                 fib_rule_put(rule);
500                 flush_route_cache(ops);
501                 rules_ops_put(ops);
502                 return 0;
503         }
504
505         err = -ENOENT;
506 errout:
507         rules_ops_put(ops);
508         return err;
509 }
510
511 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
512                                          struct fib_rule *rule)
513 {
514         size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
515                          + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
516                          + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
517                          + nla_total_size(4) /* FRA_PRIORITY */
518                          + nla_total_size(4) /* FRA_TABLE */
519                          + nla_total_size(4) /* FRA_FWMARK */
520                          + nla_total_size(4); /* FRA_FWMASK */
521
522         if (ops->nlmsg_payload)
523                 payload += ops->nlmsg_payload(rule);
524
525         return payload;
526 }
527
528 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
529                             u32 pid, u32 seq, int type, int flags,
530                             struct fib_rules_ops *ops)
531 {
532         struct nlmsghdr *nlh;
533         struct fib_rule_hdr *frh;
534
535         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
536         if (nlh == NULL)
537                 return -EMSGSIZE;
538
539         frh = nlmsg_data(nlh);
540         frh->family = ops->family;
541         frh->table = rule->table;
542         NLA_PUT_U32(skb, FRA_TABLE, rule->table);
543         frh->res1 = 0;
544         frh->res2 = 0;
545         frh->action = rule->action;
546         frh->flags = rule->flags;
547
548         if (rule->action == FR_ACT_GOTO &&
549             rcu_dereference_raw(rule->ctarget) == NULL)
550                 frh->flags |= FIB_RULE_UNRESOLVED;
551
552         if (rule->iifname[0]) {
553                 NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname);
554
555                 if (rule->iifindex == -1)
556                         frh->flags |= FIB_RULE_IIF_DETACHED;
557         }
558
559         if (rule->oifname[0]) {
560                 NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname);
561
562                 if (rule->oifindex == -1)
563                         frh->flags |= FIB_RULE_OIF_DETACHED;
564         }
565
566         if (rule->pref)
567                 NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
568
569         if (rule->mark)
570                 NLA_PUT_U32(skb, FRA_FWMARK, rule->mark);
571
572         if (rule->mark_mask || rule->mark)
573                 NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask);
574
575         if (rule->target)
576                 NLA_PUT_U32(skb, FRA_GOTO, rule->target);
577
578         if (ops->fill(rule, skb, frh) < 0)
579                 goto nla_put_failure;
580
581         return nlmsg_end(skb, nlh);
582
583 nla_put_failure:
584         nlmsg_cancel(skb, nlh);
585         return -EMSGSIZE;
586 }
587
588 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
589                       struct fib_rules_ops *ops)
590 {
591         int idx = 0;
592         struct fib_rule *rule;
593
594         list_for_each_entry(rule, &ops->rules_list, list) {
595                 if (idx < cb->args[1])
596                         goto skip;
597
598                 if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
599                                      cb->nlh->nlmsg_seq, RTM_NEWRULE,
600                                      NLM_F_MULTI, ops) < 0)
601                         break;
602 skip:
603                 idx++;
604         }
605         cb->args[1] = idx;
606         rules_ops_put(ops);
607
608         return skb->len;
609 }
610
611 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
612 {
613         struct net *net = sock_net(skb->sk);
614         struct fib_rules_ops *ops;
615         int idx = 0, family;
616
617         family = rtnl_msg_family(cb->nlh);
618         if (family != AF_UNSPEC) {
619                 /* Protocol specific dump request */
620                 ops = lookup_rules_ops(net, family);
621                 if (ops == NULL)
622                         return -EAFNOSUPPORT;
623
624                 return dump_rules(skb, cb, ops);
625         }
626
627         rcu_read_lock();
628         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
629                 if (idx < cb->args[0] || !try_module_get(ops->owner))
630                         goto skip;
631
632                 if (dump_rules(skb, cb, ops) < 0)
633                         break;
634
635                 cb->args[1] = 0;
636 skip:
637                 idx++;
638         }
639         rcu_read_unlock();
640         cb->args[0] = idx;
641
642         return skb->len;
643 }
644
645 static void notify_rule_change(int event, struct fib_rule *rule,
646                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
647                                u32 pid)
648 {
649         struct net *net;
650         struct sk_buff *skb;
651         int err = -ENOBUFS;
652
653         net = ops->fro_net;
654         skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
655         if (skb == NULL)
656                 goto errout;
657
658         err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
659         if (err < 0) {
660                 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
661                 WARN_ON(err == -EMSGSIZE);
662                 kfree_skb(skb);
663                 goto errout;
664         }
665
666         rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
667         return;
668 errout:
669         if (err < 0)
670                 rtnl_set_sk_err(net, ops->nlgroup, err);
671 }
672
673 static void attach_rules(struct list_head *rules, struct net_device *dev)
674 {
675         struct fib_rule *rule;
676
677         list_for_each_entry(rule, rules, list) {
678                 if (rule->iifindex == -1 &&
679                     strcmp(dev->name, rule->iifname) == 0)
680                         rule->iifindex = dev->ifindex;
681                 if (rule->oifindex == -1 &&
682                     strcmp(dev->name, rule->oifname) == 0)
683                         rule->oifindex = dev->ifindex;
684         }
685 }
686
687 static void detach_rules(struct list_head *rules, struct net_device *dev)
688 {
689         struct fib_rule *rule;
690
691         list_for_each_entry(rule, rules, list) {
692                 if (rule->iifindex == dev->ifindex)
693                         rule->iifindex = -1;
694                 if (rule->oifindex == dev->ifindex)
695                         rule->oifindex = -1;
696         }
697 }
698
699
700 static int fib_rules_event(struct notifier_block *this, unsigned long event,
701                             void *ptr)
702 {
703         struct net_device *dev = ptr;
704         struct net *net = dev_net(dev);
705         struct fib_rules_ops *ops;
706
707         ASSERT_RTNL();
708
709         switch (event) {
710         case NETDEV_REGISTER:
711                 list_for_each_entry(ops, &net->rules_ops, list)
712                         attach_rules(&ops->rules_list, dev);
713                 break;
714
715         case NETDEV_UNREGISTER:
716                 list_for_each_entry(ops, &net->rules_ops, list)
717                         detach_rules(&ops->rules_list, dev);
718                 break;
719         }
720
721         return NOTIFY_DONE;
722 }
723
724 static struct notifier_block fib_rules_notifier = {
725         .notifier_call = fib_rules_event,
726 };
727
728 static int __net_init fib_rules_net_init(struct net *net)
729 {
730         INIT_LIST_HEAD(&net->rules_ops);
731         spin_lock_init(&net->rules_mod_lock);
732         return 0;
733 }
734
735 static struct pernet_operations fib_rules_net_ops = {
736         .init = fib_rules_net_init,
737 };
738
739 static int __init fib_rules_init(void)
740 {
741         int err;
742         rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL);
743         rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
744         rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);
745
746         err = register_pernet_subsys(&fib_rules_net_ops);
747         if (err < 0)
748                 goto fail;
749
750         err = register_netdevice_notifier(&fib_rules_notifier);
751         if (err < 0)
752                 goto fail_unregister;
753
754         return 0;
755
756 fail_unregister:
757         unregister_pernet_subsys(&fib_rules_net_ops);
758 fail:
759         rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
760         rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
761         rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
762         return err;
763 }
764
765 subsys_initcall(fib_rules_init);