Merge branch 'master' of ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
[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/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                             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                         if (rtnl_dereference(rule->ctarget) == NULL)
481                                 ops->unresolved_rules--;
482                 }
483
484                 /*
485                  * Check if this rule is a target to any of them. If so,
486                  * disable them. As this operation is eventually very
487                  * expensive, it is only performed if goto rules have
488                  * actually been added.
489                  */
490                 if (ops->nr_goto_rules > 0) {
491                         list_for_each_entry(tmp, &ops->rules_list, list) {
492                                 if (rtnl_dereference(tmp->ctarget) == rule) {
493                                         RCU_INIT_POINTER(tmp->ctarget, NULL);
494                                         ops->unresolved_rules++;
495                                 }
496                         }
497                 }
498
499                 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
500                                    NETLINK_CB(skb).pid);
501                 fib_rule_put(rule);
502                 flush_route_cache(ops);
503                 rules_ops_put(ops);
504                 return 0;
505         }
506
507         err = -ENOENT;
508 errout:
509         rules_ops_put(ops);
510         return err;
511 }
512
513 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
514                                          struct fib_rule *rule)
515 {
516         size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
517                          + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
518                          + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
519                          + nla_total_size(4) /* FRA_PRIORITY */
520                          + nla_total_size(4) /* FRA_TABLE */
521                          + nla_total_size(4) /* FRA_FWMARK */
522                          + nla_total_size(4); /* FRA_FWMASK */
523
524         if (ops->nlmsg_payload)
525                 payload += ops->nlmsg_payload(rule);
526
527         return payload;
528 }
529
530 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
531                             u32 pid, u32 seq, int type, int flags,
532                             struct fib_rules_ops *ops)
533 {
534         struct nlmsghdr *nlh;
535         struct fib_rule_hdr *frh;
536
537         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
538         if (nlh == NULL)
539                 return -EMSGSIZE;
540
541         frh = nlmsg_data(nlh);
542         frh->family = ops->family;
543         frh->table = rule->table;
544         NLA_PUT_U32(skb, FRA_TABLE, rule->table);
545         frh->res1 = 0;
546         frh->res2 = 0;
547         frh->action = rule->action;
548         frh->flags = rule->flags;
549
550         if (rule->action == FR_ACT_GOTO &&
551             rcu_access_pointer(rule->ctarget) == NULL)
552                 frh->flags |= FIB_RULE_UNRESOLVED;
553
554         if (rule->iifname[0]) {
555                 NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname);
556
557                 if (rule->iifindex == -1)
558                         frh->flags |= FIB_RULE_IIF_DETACHED;
559         }
560
561         if (rule->oifname[0]) {
562                 NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname);
563
564                 if (rule->oifindex == -1)
565                         frh->flags |= FIB_RULE_OIF_DETACHED;
566         }
567
568         if (rule->pref)
569                 NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
570
571         if (rule->mark)
572                 NLA_PUT_U32(skb, FRA_FWMARK, rule->mark);
573
574         if (rule->mark_mask || rule->mark)
575                 NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask);
576
577         if (rule->target)
578                 NLA_PUT_U32(skb, FRA_GOTO, rule->target);
579
580         if (ops->fill(rule, skb, frh) < 0)
581                 goto nla_put_failure;
582
583         return nlmsg_end(skb, nlh);
584
585 nla_put_failure:
586         nlmsg_cancel(skb, nlh);
587         return -EMSGSIZE;
588 }
589
590 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
591                       struct fib_rules_ops *ops)
592 {
593         int idx = 0;
594         struct fib_rule *rule;
595
596         rcu_read_lock();
597         list_for_each_entry_rcu(rule, &ops->rules_list, list) {
598                 if (idx < cb->args[1])
599                         goto skip;
600
601                 if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
602                                      cb->nlh->nlmsg_seq, RTM_NEWRULE,
603                                      NLM_F_MULTI, ops) < 0)
604                         break;
605 skip:
606                 idx++;
607         }
608         rcu_read_unlock();
609         cb->args[1] = idx;
610         rules_ops_put(ops);
611
612         return skb->len;
613 }
614
615 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
616 {
617         struct net *net = sock_net(skb->sk);
618         struct fib_rules_ops *ops;
619         int idx = 0, family;
620
621         family = rtnl_msg_family(cb->nlh);
622         if (family != AF_UNSPEC) {
623                 /* Protocol specific dump request */
624                 ops = lookup_rules_ops(net, family);
625                 if (ops == NULL)
626                         return -EAFNOSUPPORT;
627
628                 return dump_rules(skb, cb, ops);
629         }
630
631         rcu_read_lock();
632         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
633                 if (idx < cb->args[0] || !try_module_get(ops->owner))
634                         goto skip;
635
636                 if (dump_rules(skb, cb, ops) < 0)
637                         break;
638
639                 cb->args[1] = 0;
640 skip:
641                 idx++;
642         }
643         rcu_read_unlock();
644         cb->args[0] = idx;
645
646         return skb->len;
647 }
648
649 static void notify_rule_change(int event, struct fib_rule *rule,
650                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
651                                u32 pid)
652 {
653         struct net *net;
654         struct sk_buff *skb;
655         int err = -ENOBUFS;
656
657         net = ops->fro_net;
658         skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
659         if (skb == NULL)
660                 goto errout;
661
662         err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
663         if (err < 0) {
664                 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
665                 WARN_ON(err == -EMSGSIZE);
666                 kfree_skb(skb);
667                 goto errout;
668         }
669
670         rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
671         return;
672 errout:
673         if (err < 0)
674                 rtnl_set_sk_err(net, ops->nlgroup, err);
675 }
676
677 static void attach_rules(struct list_head *rules, struct net_device *dev)
678 {
679         struct fib_rule *rule;
680
681         list_for_each_entry(rule, rules, list) {
682                 if (rule->iifindex == -1 &&
683                     strcmp(dev->name, rule->iifname) == 0)
684                         rule->iifindex = dev->ifindex;
685                 if (rule->oifindex == -1 &&
686                     strcmp(dev->name, rule->oifname) == 0)
687                         rule->oifindex = dev->ifindex;
688         }
689 }
690
691 static void detach_rules(struct list_head *rules, struct net_device *dev)
692 {
693         struct fib_rule *rule;
694
695         list_for_each_entry(rule, rules, list) {
696                 if (rule->iifindex == dev->ifindex)
697                         rule->iifindex = -1;
698                 if (rule->oifindex == dev->ifindex)
699                         rule->oifindex = -1;
700         }
701 }
702
703
704 static int fib_rules_event(struct notifier_block *this, unsigned long event,
705                             void *ptr)
706 {
707         struct net_device *dev = ptr;
708         struct net *net = dev_net(dev);
709         struct fib_rules_ops *ops;
710
711         ASSERT_RTNL();
712
713         switch (event) {
714         case NETDEV_REGISTER:
715                 list_for_each_entry(ops, &net->rules_ops, list)
716                         attach_rules(&ops->rules_list, dev);
717                 break;
718
719         case NETDEV_UNREGISTER:
720                 list_for_each_entry(ops, &net->rules_ops, list)
721                         detach_rules(&ops->rules_list, dev);
722                 break;
723         }
724
725         return NOTIFY_DONE;
726 }
727
728 static struct notifier_block fib_rules_notifier = {
729         .notifier_call = fib_rules_event,
730 };
731
732 static int __net_init fib_rules_net_init(struct net *net)
733 {
734         INIT_LIST_HEAD(&net->rules_ops);
735         spin_lock_init(&net->rules_mod_lock);
736         return 0;
737 }
738
739 static struct pernet_operations fib_rules_net_ops = {
740         .init = fib_rules_net_init,
741 };
742
743 static int __init fib_rules_init(void)
744 {
745         int err;
746         rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL);
747         rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL);
748         rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL);
749
750         err = register_pernet_subsys(&fib_rules_net_ops);
751         if (err < 0)
752                 goto fail;
753
754         err = register_netdevice_notifier(&fib_rules_notifier);
755         if (err < 0)
756                 goto fail_unregister;
757
758         return 0;
759
760 fail_unregister:
761         unregister_pernet_subsys(&fib_rules_net_ops);
762 fail:
763         rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
764         rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
765         rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
766         return err;
767 }
768
769 subsys_initcall(fib_rules_init);