8248ebb5891d0764eebb9d4cbc2256c091ff357c
[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->flowi_iif))
185                 goto out;
186
187         if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
188                 goto out;
189
190         if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
191                 goto out;
192
193         ret = ops->match(rule, fl, flags);
194 out:
195         return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
196 }
197
198 int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
199                      int flags, struct fib_lookup_arg *arg)
200 {
201         struct fib_rule *rule;
202         int err;
203
204         rcu_read_lock();
205
206         list_for_each_entry_rcu(rule, &ops->rules_list, list) {
207 jumped:
208                 if (!fib_rule_match(rule, ops, fl, flags))
209                         continue;
210
211                 if (rule->action == FR_ACT_GOTO) {
212                         struct fib_rule *target;
213
214                         target = rcu_dereference(rule->ctarget);
215                         if (target == NULL) {
216                                 continue;
217                         } else {
218                                 rule = target;
219                                 goto jumped;
220                         }
221                 } else if (rule->action == FR_ACT_NOP)
222                         continue;
223                 else
224                         err = ops->action(rule, fl, flags, arg);
225
226                 if (err != -EAGAIN) {
227                         if ((arg->flags & FIB_LOOKUP_NOREF) ||
228                             likely(atomic_inc_not_zero(&rule->refcnt))) {
229                                 arg->rule = rule;
230                                 goto out;
231                         }
232                         break;
233                 }
234         }
235
236         err = -ESRCH;
237 out:
238         rcu_read_unlock();
239
240         return err;
241 }
242 EXPORT_SYMBOL_GPL(fib_rules_lookup);
243
244 static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
245                             struct fib_rules_ops *ops)
246 {
247         int err = -EINVAL;
248
249         if (frh->src_len)
250                 if (tb[FRA_SRC] == NULL ||
251                     frh->src_len > (ops->addr_size * 8) ||
252                     nla_len(tb[FRA_SRC]) != ops->addr_size)
253                         goto errout;
254
255         if (frh->dst_len)
256                 if (tb[FRA_DST] == NULL ||
257                     frh->dst_len > (ops->addr_size * 8) ||
258                     nla_len(tb[FRA_DST]) != ops->addr_size)
259                         goto errout;
260
261         err = 0;
262 errout:
263         return err;
264 }
265
266 static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
267 {
268         struct net *net = sock_net(skb->sk);
269         struct fib_rule_hdr *frh = nlmsg_data(nlh);
270         struct fib_rules_ops *ops = NULL;
271         struct fib_rule *rule, *r, *last = NULL;
272         struct nlattr *tb[FRA_MAX+1];
273         int err = -EINVAL, unresolved = 0;
274
275         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
276                 goto errout;
277
278         ops = lookup_rules_ops(net, frh->family);
279         if (ops == NULL) {
280                 err = -EAFNOSUPPORT;
281                 goto errout;
282         }
283
284         err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
285         if (err < 0)
286                 goto errout;
287
288         err = validate_rulemsg(frh, tb, ops);
289         if (err < 0)
290                 goto errout;
291
292         rule = kzalloc(ops->rule_size, GFP_KERNEL);
293         if (rule == NULL) {
294                 err = -ENOMEM;
295                 goto errout;
296         }
297         rule->fr_net = hold_net(net);
298
299         if (tb[FRA_PRIORITY])
300                 rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
301
302         if (tb[FRA_IIFNAME]) {
303                 struct net_device *dev;
304
305                 rule->iifindex = -1;
306                 nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
307                 dev = __dev_get_by_name(net, rule->iifname);
308                 if (dev)
309                         rule->iifindex = dev->ifindex;
310         }
311
312         if (tb[FRA_OIFNAME]) {
313                 struct net_device *dev;
314
315                 rule->oifindex = -1;
316                 nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
317                 dev = __dev_get_by_name(net, rule->oifname);
318                 if (dev)
319                         rule->oifindex = dev->ifindex;
320         }
321
322         if (tb[FRA_FWMARK]) {
323                 rule->mark = nla_get_u32(tb[FRA_FWMARK]);
324                 if (rule->mark)
325                         /* compatibility: if the mark value is non-zero all bits
326                          * are compared unless a mask is explicitly specified.
327                          */
328                         rule->mark_mask = 0xFFFFFFFF;
329         }
330
331         if (tb[FRA_FWMASK])
332                 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
333
334         rule->action = frh->action;
335         rule->flags = frh->flags;
336         rule->table = frh_get_table(frh, tb);
337
338         if (!tb[FRA_PRIORITY] && ops->default_pref)
339                 rule->pref = ops->default_pref(ops);
340
341         err = -EINVAL;
342         if (tb[FRA_GOTO]) {
343                 if (rule->action != FR_ACT_GOTO)
344                         goto errout_free;
345
346                 rule->target = nla_get_u32(tb[FRA_GOTO]);
347                 /* Backward jumps are prohibited to avoid endless loops */
348                 if (rule->target <= rule->pref)
349                         goto errout_free;
350
351                 list_for_each_entry(r, &ops->rules_list, list) {
352                         if (r->pref == rule->target) {
353                                 RCU_INIT_POINTER(rule->ctarget, r);
354                                 break;
355                         }
356                 }
357
358                 if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
359                         unresolved = 1;
360         } else if (rule->action == FR_ACT_GOTO)
361                 goto errout_free;
362
363         err = ops->configure(rule, skb, frh, tb);
364         if (err < 0)
365                 goto errout_free;
366
367         list_for_each_entry(r, &ops->rules_list, list) {
368                 if (r->pref > rule->pref)
369                         break;
370                 last = r;
371         }
372
373         fib_rule_get(rule);
374
375         if (last)
376                 list_add_rcu(&rule->list, &last->list);
377         else
378                 list_add_rcu(&rule->list, &ops->rules_list);
379
380         if (ops->unresolved_rules) {
381                 /*
382                  * There are unresolved goto rules in the list, check if
383                  * any of them are pointing to this new rule.
384                  */
385                 list_for_each_entry(r, &ops->rules_list, list) {
386                         if (r->action == FR_ACT_GOTO &&
387                             r->target == rule->pref) {
388                                 BUG_ON(rtnl_dereference(r->ctarget) != NULL);
389                                 rcu_assign_pointer(r->ctarget, rule);
390                                 if (--ops->unresolved_rules == 0)
391                                         break;
392                         }
393                 }
394         }
395
396         if (rule->action == FR_ACT_GOTO)
397                 ops->nr_goto_rules++;
398
399         if (unresolved)
400                 ops->unresolved_rules++;
401
402         notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
403         flush_route_cache(ops);
404         rules_ops_put(ops);
405         return 0;
406
407 errout_free:
408         release_net(rule->fr_net);
409         kfree(rule);
410 errout:
411         rules_ops_put(ops);
412         return err;
413 }
414
415 static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
416 {
417         struct net *net = sock_net(skb->sk);
418         struct fib_rule_hdr *frh = nlmsg_data(nlh);
419         struct fib_rules_ops *ops = NULL;
420         struct fib_rule *rule, *tmp;
421         struct nlattr *tb[FRA_MAX+1];
422         int err = -EINVAL;
423
424         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
425                 goto errout;
426
427         ops = lookup_rules_ops(net, frh->family);
428         if (ops == NULL) {
429                 err = -EAFNOSUPPORT;
430                 goto errout;
431         }
432
433         err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
434         if (err < 0)
435                 goto errout;
436
437         err = validate_rulemsg(frh, tb, ops);
438         if (err < 0)
439                 goto errout;
440
441         list_for_each_entry(rule, &ops->rules_list, list) {
442                 if (frh->action && (frh->action != rule->action))
443                         continue;
444
445                 if (frh->table && (frh_get_table(frh, tb) != rule->table))
446                         continue;
447
448                 if (tb[FRA_PRIORITY] &&
449                     (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
450                         continue;
451
452                 if (tb[FRA_IIFNAME] &&
453                     nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
454                         continue;
455
456                 if (tb[FRA_OIFNAME] &&
457                     nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
458                         continue;
459
460                 if (tb[FRA_FWMARK] &&
461                     (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
462                         continue;
463
464                 if (tb[FRA_FWMASK] &&
465                     (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
466                         continue;
467
468                 if (!ops->compare(rule, frh, tb))
469                         continue;
470
471                 if (rule->flags & FIB_RULE_PERMANENT) {
472                         err = -EPERM;
473                         goto errout;
474                 }
475
476                 list_del_rcu(&rule->list);
477
478                 if (rule->action == FR_ACT_GOTO)
479                         ops->nr_goto_rules--;
480
481                 /*
482                  * Check if this rule is a target to any of them. If so,
483                  * disable them. As this operation is eventually very
484                  * expensive, it is only performed if goto rules have
485                  * actually been added.
486                  */
487                 if (ops->nr_goto_rules > 0) {
488                         list_for_each_entry(tmp, &ops->rules_list, list) {
489                                 if (rtnl_dereference(tmp->ctarget) == rule) {
490                                         rcu_assign_pointer(tmp->ctarget, NULL);
491                                         ops->unresolved_rules++;
492                                 }
493                         }
494                 }
495
496                 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
497                                    NETLINK_CB(skb).pid);
498                 fib_rule_put(rule);
499                 flush_route_cache(ops);
500                 rules_ops_put(ops);
501                 return 0;
502         }
503
504         err = -ENOENT;
505 errout:
506         rules_ops_put(ops);
507         return err;
508 }
509
510 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
511                                          struct fib_rule *rule)
512 {
513         size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
514                          + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
515                          + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
516                          + nla_total_size(4) /* FRA_PRIORITY */
517                          + nla_total_size(4) /* FRA_TABLE */
518                          + nla_total_size(4) /* FRA_FWMARK */
519                          + nla_total_size(4); /* FRA_FWMASK */
520
521         if (ops->nlmsg_payload)
522                 payload += ops->nlmsg_payload(rule);
523
524         return payload;
525 }
526
527 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
528                             u32 pid, u32 seq, int type, int flags,
529                             struct fib_rules_ops *ops)
530 {
531         struct nlmsghdr *nlh;
532         struct fib_rule_hdr *frh;
533
534         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
535         if (nlh == NULL)
536                 return -EMSGSIZE;
537
538         frh = nlmsg_data(nlh);
539         frh->family = ops->family;
540         frh->table = rule->table;
541         NLA_PUT_U32(skb, FRA_TABLE, rule->table);
542         frh->res1 = 0;
543         frh->res2 = 0;
544         frh->action = rule->action;
545         frh->flags = rule->flags;
546
547         if (rule->action == FR_ACT_GOTO &&
548             rcu_dereference_raw(rule->ctarget) == NULL)
549                 frh->flags |= FIB_RULE_UNRESOLVED;
550
551         if (rule->iifname[0]) {
552                 NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname);
553
554                 if (rule->iifindex == -1)
555                         frh->flags |= FIB_RULE_IIF_DETACHED;
556         }
557
558         if (rule->oifname[0]) {
559                 NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname);
560
561                 if (rule->oifindex == -1)
562                         frh->flags |= FIB_RULE_OIF_DETACHED;
563         }
564
565         if (rule->pref)
566                 NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
567
568         if (rule->mark)
569                 NLA_PUT_U32(skb, FRA_FWMARK, rule->mark);
570
571         if (rule->mark_mask || rule->mark)
572                 NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask);
573
574         if (rule->target)
575                 NLA_PUT_U32(skb, FRA_GOTO, rule->target);
576
577         if (ops->fill(rule, skb, frh) < 0)
578                 goto nla_put_failure;
579
580         return nlmsg_end(skb, nlh);
581
582 nla_put_failure:
583         nlmsg_cancel(skb, nlh);
584         return -EMSGSIZE;
585 }
586
587 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
588                       struct fib_rules_ops *ops)
589 {
590         int idx = 0;
591         struct fib_rule *rule;
592
593         list_for_each_entry(rule, &ops->rules_list, list) {
594                 if (idx < cb->args[1])
595                         goto skip;
596
597                 if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
598                                      cb->nlh->nlmsg_seq, RTM_NEWRULE,
599                                      NLM_F_MULTI, ops) < 0)
600                         break;
601 skip:
602                 idx++;
603         }
604         cb->args[1] = idx;
605         rules_ops_put(ops);
606
607         return skb->len;
608 }
609
610 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
611 {
612         struct net *net = sock_net(skb->sk);
613         struct fib_rules_ops *ops;
614         int idx = 0, family;
615
616         family = rtnl_msg_family(cb->nlh);
617         if (family != AF_UNSPEC) {
618                 /* Protocol specific dump request */
619                 ops = lookup_rules_ops(net, family);
620                 if (ops == NULL)
621                         return -EAFNOSUPPORT;
622
623                 return dump_rules(skb, cb, ops);
624         }
625
626         rcu_read_lock();
627         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
628                 if (idx < cb->args[0] || !try_module_get(ops->owner))
629                         goto skip;
630
631                 if (dump_rules(skb, cb, ops) < 0)
632                         break;
633
634                 cb->args[1] = 0;
635 skip:
636                 idx++;
637         }
638         rcu_read_unlock();
639         cb->args[0] = idx;
640
641         return skb->len;
642 }
643
644 static void notify_rule_change(int event, struct fib_rule *rule,
645                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
646                                u32 pid)
647 {
648         struct net *net;
649         struct sk_buff *skb;
650         int err = -ENOBUFS;
651
652         net = ops->fro_net;
653         skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
654         if (skb == NULL)
655                 goto errout;
656
657         err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
658         if (err < 0) {
659                 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
660                 WARN_ON(err == -EMSGSIZE);
661                 kfree_skb(skb);
662                 goto errout;
663         }
664
665         rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
666         return;
667 errout:
668         if (err < 0)
669                 rtnl_set_sk_err(net, ops->nlgroup, err);
670 }
671
672 static void attach_rules(struct list_head *rules, struct net_device *dev)
673 {
674         struct fib_rule *rule;
675
676         list_for_each_entry(rule, rules, list) {
677                 if (rule->iifindex == -1 &&
678                     strcmp(dev->name, rule->iifname) == 0)
679                         rule->iifindex = dev->ifindex;
680                 if (rule->oifindex == -1 &&
681                     strcmp(dev->name, rule->oifname) == 0)
682                         rule->oifindex = dev->ifindex;
683         }
684 }
685
686 static void detach_rules(struct list_head *rules, struct net_device *dev)
687 {
688         struct fib_rule *rule;
689
690         list_for_each_entry(rule, rules, list) {
691                 if (rule->iifindex == dev->ifindex)
692                         rule->iifindex = -1;
693                 if (rule->oifindex == dev->ifindex)
694                         rule->oifindex = -1;
695         }
696 }
697
698
699 static int fib_rules_event(struct notifier_block *this, unsigned long event,
700                             void *ptr)
701 {
702         struct net_device *dev = ptr;
703         struct net *net = dev_net(dev);
704         struct fib_rules_ops *ops;
705
706         ASSERT_RTNL();
707
708         switch (event) {
709         case NETDEV_REGISTER:
710                 list_for_each_entry(ops, &net->rules_ops, list)
711                         attach_rules(&ops->rules_list, dev);
712                 break;
713
714         case NETDEV_UNREGISTER:
715                 list_for_each_entry(ops, &net->rules_ops, list)
716                         detach_rules(&ops->rules_list, dev);
717                 break;
718         }
719
720         return NOTIFY_DONE;
721 }
722
723 static struct notifier_block fib_rules_notifier = {
724         .notifier_call = fib_rules_event,
725 };
726
727 static int __net_init fib_rules_net_init(struct net *net)
728 {
729         INIT_LIST_HEAD(&net->rules_ops);
730         spin_lock_init(&net->rules_mod_lock);
731         return 0;
732 }
733
734 static struct pernet_operations fib_rules_net_ops = {
735         .init = fib_rules_net_init,
736 };
737
738 static int __init fib_rules_init(void)
739 {
740         int err;
741         rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL);
742         rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
743         rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);
744
745         err = register_pernet_subsys(&fib_rules_net_ops);
746         if (err < 0)
747                 goto fail;
748
749         err = register_netdevice_notifier(&fib_rules_notifier);
750         if (err < 0)
751                 goto fail_unregister;
752
753         return 0;
754
755 fail_unregister:
756         unregister_pernet_subsys(&fib_rules_net_ops);
757 fail:
758         rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
759         rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
760         rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
761         return err;
762 }
763
764 subsys_initcall(fib_rules_init);