aio: don't include aio.h in sched.h
[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 <linux/module.h>
16 #include <net/net_namespace.h>
17 #include <net/sock.h>
18 #include <net/fib_rules.h>
19
20 int fib_default_rule_add(struct fib_rules_ops *ops,
21                          u32 pref, u32 table, u32 flags)
22 {
23         struct fib_rule *r;
24
25         r = kzalloc(ops->rule_size, GFP_KERNEL);
26         if (r == NULL)
27                 return -ENOMEM;
28
29         atomic_set(&r->refcnt, 1);
30         r->action = FR_ACT_TO_TBL;
31         r->pref = pref;
32         r->table = table;
33         r->flags = flags;
34         r->fr_net = hold_net(ops->fro_net);
35
36         /* The lock is not required here, the list in unreacheable
37          * at the moment this function is called */
38         list_add_tail(&r->list, &ops->rules_list);
39         return 0;
40 }
41 EXPORT_SYMBOL(fib_default_rule_add);
42
43 u32 fib_default_rule_pref(struct fib_rules_ops *ops)
44 {
45         struct list_head *pos;
46         struct fib_rule *rule;
47
48         if (!list_empty(&ops->rules_list)) {
49                 pos = ops->rules_list.next;
50                 if (pos->next != &ops->rules_list) {
51                         rule = list_entry(pos->next, struct fib_rule, list);
52                         if (rule->pref)
53                                 return rule->pref - 1;
54                 }
55         }
56
57         return 0;
58 }
59 EXPORT_SYMBOL(fib_default_rule_pref);
60
61 static void notify_rule_change(int event, struct fib_rule *rule,
62                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
63                                u32 pid);
64
65 static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
66 {
67         struct fib_rules_ops *ops;
68
69         rcu_read_lock();
70         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
71                 if (ops->family == family) {
72                         if (!try_module_get(ops->owner))
73                                 ops = NULL;
74                         rcu_read_unlock();
75                         return ops;
76                 }
77         }
78         rcu_read_unlock();
79
80         return NULL;
81 }
82
83 static void rules_ops_put(struct fib_rules_ops *ops)
84 {
85         if (ops)
86                 module_put(ops->owner);
87 }
88
89 static void flush_route_cache(struct fib_rules_ops *ops)
90 {
91         if (ops->flush_cache)
92                 ops->flush_cache(ops);
93 }
94
95 static int __fib_rules_register(struct fib_rules_ops *ops)
96 {
97         int err = -EEXIST;
98         struct fib_rules_ops *o;
99         struct net *net;
100
101         net = ops->fro_net;
102
103         if (ops->rule_size < sizeof(struct fib_rule))
104                 return -EINVAL;
105
106         if (ops->match == NULL || ops->configure == NULL ||
107             ops->compare == NULL || ops->fill == NULL ||
108             ops->action == NULL)
109                 return -EINVAL;
110
111         spin_lock(&net->rules_mod_lock);
112         list_for_each_entry(o, &net->rules_ops, list)
113                 if (ops->family == o->family)
114                         goto errout;
115
116         hold_net(net);
117         list_add_tail_rcu(&ops->list, &net->rules_ops);
118         err = 0;
119 errout:
120         spin_unlock(&net->rules_mod_lock);
121
122         return err;
123 }
124
125 struct fib_rules_ops *
126 fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
127 {
128         struct fib_rules_ops *ops;
129         int err;
130
131         ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
132         if (ops == NULL)
133                 return ERR_PTR(-ENOMEM);
134
135         INIT_LIST_HEAD(&ops->rules_list);
136         ops->fro_net = net;
137
138         err = __fib_rules_register(ops);
139         if (err) {
140                 kfree(ops);
141                 ops = ERR_PTR(err);
142         }
143
144         return ops;
145 }
146 EXPORT_SYMBOL_GPL(fib_rules_register);
147
148 static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
149 {
150         struct fib_rule *rule, *tmp;
151
152         list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
153                 list_del_rcu(&rule->list);
154                 if (ops->delete)
155                         ops->delete(rule);
156                 fib_rule_put(rule);
157         }
158 }
159
160 static void fib_rules_put_rcu(struct rcu_head *head)
161 {
162         struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu);
163         struct net *net = ops->fro_net;
164
165         release_net(net);
166         kfree(ops);
167 }
168
169 void fib_rules_unregister(struct fib_rules_ops *ops)
170 {
171         struct net *net = ops->fro_net;
172
173         spin_lock(&net->rules_mod_lock);
174         list_del_rcu(&ops->list);
175         fib_rules_cleanup_ops(ops);
176         spin_unlock(&net->rules_mod_lock);
177
178         call_rcu(&ops->rcu, fib_rules_put_rcu);
179 }
180 EXPORT_SYMBOL_GPL(fib_rules_unregister);
181
182 static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
183                           struct flowi *fl, int flags)
184 {
185         int ret = 0;
186
187         if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
188                 goto out;
189
190         if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
191                 goto out;
192
193         if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
194                 goto out;
195
196         ret = ops->match(rule, fl, flags);
197 out:
198         return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
199 }
200
201 int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
202                      int flags, struct fib_lookup_arg *arg)
203 {
204         struct fib_rule *rule;
205         int err;
206
207         rcu_read_lock();
208
209         list_for_each_entry_rcu(rule, &ops->rules_list, list) {
210 jumped:
211                 if (!fib_rule_match(rule, ops, fl, flags))
212                         continue;
213
214                 if (rule->action == FR_ACT_GOTO) {
215                         struct fib_rule *target;
216
217                         target = rcu_dereference(rule->ctarget);
218                         if (target == NULL) {
219                                 continue;
220                         } else {
221                                 rule = target;
222                                 goto jumped;
223                         }
224                 } else if (rule->action == FR_ACT_NOP)
225                         continue;
226                 else
227                         err = ops->action(rule, fl, flags, arg);
228
229                 if (err != -EAGAIN) {
230                         if ((arg->flags & FIB_LOOKUP_NOREF) ||
231                             likely(atomic_inc_not_zero(&rule->refcnt))) {
232                                 arg->rule = rule;
233                                 goto out;
234                         }
235                         break;
236                 }
237         }
238
239         err = -ESRCH;
240 out:
241         rcu_read_unlock();
242
243         return err;
244 }
245 EXPORT_SYMBOL_GPL(fib_rules_lookup);
246
247 static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
248                             struct fib_rules_ops *ops)
249 {
250         int err = -EINVAL;
251
252         if (frh->src_len)
253                 if (tb[FRA_SRC] == NULL ||
254                     frh->src_len > (ops->addr_size * 8) ||
255                     nla_len(tb[FRA_SRC]) != ops->addr_size)
256                         goto errout;
257
258         if (frh->dst_len)
259                 if (tb[FRA_DST] == NULL ||
260                     frh->dst_len > (ops->addr_size * 8) ||
261                     nla_len(tb[FRA_DST]) != ops->addr_size)
262                         goto errout;
263
264         err = 0;
265 errout:
266         return err;
267 }
268
269 static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh)
270 {
271         struct net *net = sock_net(skb->sk);
272         struct fib_rule_hdr *frh = nlmsg_data(nlh);
273         struct fib_rules_ops *ops = NULL;
274         struct fib_rule *rule, *r, *last = NULL;
275         struct nlattr *tb[FRA_MAX+1];
276         int err = -EINVAL, unresolved = 0;
277
278         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
279                 goto errout;
280
281         ops = lookup_rules_ops(net, frh->family);
282         if (ops == NULL) {
283                 err = -EAFNOSUPPORT;
284                 goto errout;
285         }
286
287         err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
288         if (err < 0)
289                 goto errout;
290
291         err = validate_rulemsg(frh, tb, ops);
292         if (err < 0)
293                 goto errout;
294
295         rule = kzalloc(ops->rule_size, GFP_KERNEL);
296         if (rule == NULL) {
297                 err = -ENOMEM;
298                 goto errout;
299         }
300         rule->fr_net = hold_net(net);
301
302         if (tb[FRA_PRIORITY])
303                 rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
304
305         if (tb[FRA_IIFNAME]) {
306                 struct net_device *dev;
307
308                 rule->iifindex = -1;
309                 nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
310                 dev = __dev_get_by_name(net, rule->iifname);
311                 if (dev)
312                         rule->iifindex = dev->ifindex;
313         }
314
315         if (tb[FRA_OIFNAME]) {
316                 struct net_device *dev;
317
318                 rule->oifindex = -1;
319                 nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
320                 dev = __dev_get_by_name(net, rule->oifname);
321                 if (dev)
322                         rule->oifindex = dev->ifindex;
323         }
324
325         if (tb[FRA_FWMARK]) {
326                 rule->mark = nla_get_u32(tb[FRA_FWMARK]);
327                 if (rule->mark)
328                         /* compatibility: if the mark value is non-zero all bits
329                          * are compared unless a mask is explicitly specified.
330                          */
331                         rule->mark_mask = 0xFFFFFFFF;
332         }
333
334         if (tb[FRA_FWMASK])
335                 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
336
337         rule->action = frh->action;
338         rule->flags = frh->flags;
339         rule->table = frh_get_table(frh, tb);
340
341         if (!tb[FRA_PRIORITY] && ops->default_pref)
342                 rule->pref = ops->default_pref(ops);
343
344         err = -EINVAL;
345         if (tb[FRA_GOTO]) {
346                 if (rule->action != FR_ACT_GOTO)
347                         goto errout_free;
348
349                 rule->target = nla_get_u32(tb[FRA_GOTO]);
350                 /* Backward jumps are prohibited to avoid endless loops */
351                 if (rule->target <= rule->pref)
352                         goto errout_free;
353
354                 list_for_each_entry(r, &ops->rules_list, list) {
355                         if (r->pref == rule->target) {
356                                 RCU_INIT_POINTER(rule->ctarget, r);
357                                 break;
358                         }
359                 }
360
361                 if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
362                         unresolved = 1;
363         } else if (rule->action == FR_ACT_GOTO)
364                 goto errout_free;
365
366         err = ops->configure(rule, skb, frh, tb);
367         if (err < 0)
368                 goto errout_free;
369
370         list_for_each_entry(r, &ops->rules_list, list) {
371                 if (r->pref > rule->pref)
372                         break;
373                 last = r;
374         }
375
376         fib_rule_get(rule);
377
378         if (last)
379                 list_add_rcu(&rule->list, &last->list);
380         else
381                 list_add_rcu(&rule->list, &ops->rules_list);
382
383         if (ops->unresolved_rules) {
384                 /*
385                  * There are unresolved goto rules in the list, check if
386                  * any of them are pointing to this new rule.
387                  */
388                 list_for_each_entry(r, &ops->rules_list, list) {
389                         if (r->action == FR_ACT_GOTO &&
390                             r->target == rule->pref &&
391                             rtnl_dereference(r->ctarget) == NULL) {
392                                 rcu_assign_pointer(r->ctarget, rule);
393                                 if (--ops->unresolved_rules == 0)
394                                         break;
395                         }
396                 }
397         }
398
399         if (rule->action == FR_ACT_GOTO)
400                 ops->nr_goto_rules++;
401
402         if (unresolved)
403                 ops->unresolved_rules++;
404
405         notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
406         flush_route_cache(ops);
407         rules_ops_put(ops);
408         return 0;
409
410 errout_free:
411         release_net(rule->fr_net);
412         kfree(rule);
413 errout:
414         rules_ops_put(ops);
415         return err;
416 }
417
418 static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh)
419 {
420         struct net *net = sock_net(skb->sk);
421         struct fib_rule_hdr *frh = nlmsg_data(nlh);
422         struct fib_rules_ops *ops = NULL;
423         struct fib_rule *rule, *tmp;
424         struct nlattr *tb[FRA_MAX+1];
425         int err = -EINVAL;
426
427         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
428                 goto errout;
429
430         ops = lookup_rules_ops(net, frh->family);
431         if (ops == NULL) {
432                 err = -EAFNOSUPPORT;
433                 goto errout;
434         }
435
436         err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
437         if (err < 0)
438                 goto errout;
439
440         err = validate_rulemsg(frh, tb, ops);
441         if (err < 0)
442                 goto errout;
443
444         list_for_each_entry(rule, &ops->rules_list, list) {
445                 if (frh->action && (frh->action != rule->action))
446                         continue;
447
448                 if (frh->table && (frh_get_table(frh, tb) != rule->table))
449                         continue;
450
451                 if (tb[FRA_PRIORITY] &&
452                     (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
453                         continue;
454
455                 if (tb[FRA_IIFNAME] &&
456                     nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
457                         continue;
458
459                 if (tb[FRA_OIFNAME] &&
460                     nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
461                         continue;
462
463                 if (tb[FRA_FWMARK] &&
464                     (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
465                         continue;
466
467                 if (tb[FRA_FWMASK] &&
468                     (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
469                         continue;
470
471                 if (!ops->compare(rule, frh, tb))
472                         continue;
473
474                 if (rule->flags & FIB_RULE_PERMANENT) {
475                         err = -EPERM;
476                         goto errout;
477                 }
478
479                 list_del_rcu(&rule->list);
480
481                 if (rule->action == FR_ACT_GOTO) {
482                         ops->nr_goto_rules--;
483                         if (rtnl_dereference(rule->ctarget) == NULL)
484                                 ops->unresolved_rules--;
485                 }
486
487                 /*
488                  * Check if this rule is a target to any of them. If so,
489                  * disable them. As this operation is eventually very
490                  * expensive, it is only performed if goto rules have
491                  * actually been added.
492                  */
493                 if (ops->nr_goto_rules > 0) {
494                         list_for_each_entry(tmp, &ops->rules_list, list) {
495                                 if (rtnl_dereference(tmp->ctarget) == rule) {
496                                         RCU_INIT_POINTER(tmp->ctarget, NULL);
497                                         ops->unresolved_rules++;
498                                 }
499                         }
500                 }
501
502                 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
503                                    NETLINK_CB(skb).portid);
504                 if (ops->delete)
505                         ops->delete(rule);
506                 fib_rule_put(rule);
507                 flush_route_cache(ops);
508                 rules_ops_put(ops);
509                 return 0;
510         }
511
512         err = -ENOENT;
513 errout:
514         rules_ops_put(ops);
515         return err;
516 }
517
518 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
519                                          struct fib_rule *rule)
520 {
521         size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
522                          + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
523                          + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
524                          + nla_total_size(4) /* FRA_PRIORITY */
525                          + nla_total_size(4) /* FRA_TABLE */
526                          + nla_total_size(4) /* FRA_FWMARK */
527                          + nla_total_size(4); /* FRA_FWMASK */
528
529         if (ops->nlmsg_payload)
530                 payload += ops->nlmsg_payload(rule);
531
532         return payload;
533 }
534
535 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
536                             u32 pid, u32 seq, int type, int flags,
537                             struct fib_rules_ops *ops)
538 {
539         struct nlmsghdr *nlh;
540         struct fib_rule_hdr *frh;
541
542         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
543         if (nlh == NULL)
544                 return -EMSGSIZE;
545
546         frh = nlmsg_data(nlh);
547         frh->family = ops->family;
548         frh->table = rule->table;
549         if (nla_put_u32(skb, FRA_TABLE, rule->table))
550                 goto nla_put_failure;
551         frh->res1 = 0;
552         frh->res2 = 0;
553         frh->action = rule->action;
554         frh->flags = rule->flags;
555
556         if (rule->action == FR_ACT_GOTO &&
557             rcu_access_pointer(rule->ctarget) == NULL)
558                 frh->flags |= FIB_RULE_UNRESOLVED;
559
560         if (rule->iifname[0]) {
561                 if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
562                         goto nla_put_failure;
563                 if (rule->iifindex == -1)
564                         frh->flags |= FIB_RULE_IIF_DETACHED;
565         }
566
567         if (rule->oifname[0]) {
568                 if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
569                         goto nla_put_failure;
570                 if (rule->oifindex == -1)
571                         frh->flags |= FIB_RULE_OIF_DETACHED;
572         }
573
574         if ((rule->pref &&
575              nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
576             (rule->mark &&
577              nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
578             ((rule->mark_mask || rule->mark) &&
579              nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
580             (rule->target &&
581              nla_put_u32(skb, FRA_GOTO, rule->target)))
582                 goto nla_put_failure;
583         if (ops->fill(rule, skb, frh) < 0)
584                 goto nla_put_failure;
585
586         return nlmsg_end(skb, nlh);
587
588 nla_put_failure:
589         nlmsg_cancel(skb, nlh);
590         return -EMSGSIZE;
591 }
592
593 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
594                       struct fib_rules_ops *ops)
595 {
596         int idx = 0;
597         struct fib_rule *rule;
598
599         rcu_read_lock();
600         list_for_each_entry_rcu(rule, &ops->rules_list, list) {
601                 if (idx < cb->args[1])
602                         goto skip;
603
604                 if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
605                                      cb->nlh->nlmsg_seq, RTM_NEWRULE,
606                                      NLM_F_MULTI, ops) < 0)
607                         break;
608 skip:
609                 idx++;
610         }
611         rcu_read_unlock();
612         cb->args[1] = idx;
613         rules_ops_put(ops);
614
615         return skb->len;
616 }
617
618 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
619 {
620         struct net *net = sock_net(skb->sk);
621         struct fib_rules_ops *ops;
622         int idx = 0, family;
623
624         family = rtnl_msg_family(cb->nlh);
625         if (family != AF_UNSPEC) {
626                 /* Protocol specific dump request */
627                 ops = lookup_rules_ops(net, family);
628                 if (ops == NULL)
629                         return -EAFNOSUPPORT;
630
631                 return dump_rules(skb, cb, ops);
632         }
633
634         rcu_read_lock();
635         list_for_each_entry_rcu(ops, &net->rules_ops, list) {
636                 if (idx < cb->args[0] || !try_module_get(ops->owner))
637                         goto skip;
638
639                 if (dump_rules(skb, cb, ops) < 0)
640                         break;
641
642                 cb->args[1] = 0;
643 skip:
644                 idx++;
645         }
646         rcu_read_unlock();
647         cb->args[0] = idx;
648
649         return skb->len;
650 }
651
652 static void notify_rule_change(int event, struct fib_rule *rule,
653                                struct fib_rules_ops *ops, struct nlmsghdr *nlh,
654                                u32 pid)
655 {
656         struct net *net;
657         struct sk_buff *skb;
658         int err = -ENOBUFS;
659
660         net = ops->fro_net;
661         skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
662         if (skb == NULL)
663                 goto errout;
664
665         err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
666         if (err < 0) {
667                 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
668                 WARN_ON(err == -EMSGSIZE);
669                 kfree_skb(skb);
670                 goto errout;
671         }
672
673         rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
674         return;
675 errout:
676         if (err < 0)
677                 rtnl_set_sk_err(net, ops->nlgroup, err);
678 }
679
680 static void attach_rules(struct list_head *rules, struct net_device *dev)
681 {
682         struct fib_rule *rule;
683
684         list_for_each_entry(rule, rules, list) {
685                 if (rule->iifindex == -1 &&
686                     strcmp(dev->name, rule->iifname) == 0)
687                         rule->iifindex = dev->ifindex;
688                 if (rule->oifindex == -1 &&
689                     strcmp(dev->name, rule->oifname) == 0)
690                         rule->oifindex = dev->ifindex;
691         }
692 }
693
694 static void detach_rules(struct list_head *rules, struct net_device *dev)
695 {
696         struct fib_rule *rule;
697
698         list_for_each_entry(rule, rules, list) {
699                 if (rule->iifindex == dev->ifindex)
700                         rule->iifindex = -1;
701                 if (rule->oifindex == dev->ifindex)
702                         rule->oifindex = -1;
703         }
704 }
705
706
707 static int fib_rules_event(struct notifier_block *this, unsigned long event,
708                             void *ptr)
709 {
710         struct net_device *dev = ptr;
711         struct net *net = dev_net(dev);
712         struct fib_rules_ops *ops;
713
714         ASSERT_RTNL();
715
716         switch (event) {
717         case NETDEV_REGISTER:
718                 list_for_each_entry(ops, &net->rules_ops, list)
719                         attach_rules(&ops->rules_list, dev);
720                 break;
721
722         case NETDEV_UNREGISTER:
723                 list_for_each_entry(ops, &net->rules_ops, list)
724                         detach_rules(&ops->rules_list, dev);
725                 break;
726         }
727
728         return NOTIFY_DONE;
729 }
730
731 static struct notifier_block fib_rules_notifier = {
732         .notifier_call = fib_rules_event,
733 };
734
735 static int __net_init fib_rules_net_init(struct net *net)
736 {
737         INIT_LIST_HEAD(&net->rules_ops);
738         spin_lock_init(&net->rules_mod_lock);
739         return 0;
740 }
741
742 static struct pernet_operations fib_rules_net_ops = {
743         .init = fib_rules_net_init,
744 };
745
746 static int __init fib_rules_init(void)
747 {
748         int err;
749         rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL);
750         rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL);
751         rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL);
752
753         err = register_pernet_subsys(&fib_rules_net_ops);
754         if (err < 0)
755                 goto fail;
756
757         err = register_netdevice_notifier(&fib_rules_notifier);
758         if (err < 0)
759                 goto fail_unregister;
760
761         return 0;
762
763 fail_unregister:
764         unregister_pernet_subsys(&fib_rules_net_ops);
765 fail:
766         rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
767         rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
768         rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
769         return err;
770 }
771
772 subsys_initcall(fib_rules_init);