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
fib_default_rule_add(struct fib_rules_ops * ops,u32 pref,u32 table,u32 flags)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
fib_default_rule_pref(struct fib_rules_ops * ops)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
lookup_rules_ops(struct net * net,int family)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
rules_ops_put(struct fib_rules_ops * ops)83 static void rules_ops_put(struct fib_rules_ops *ops)
84 {
85 if (ops)
86 module_put(ops->owner);
87 }
88
flush_route_cache(struct fib_rules_ops * ops)89 static void flush_route_cache(struct fib_rules_ops *ops)
90 {
91 if (ops->flush_cache)
92 ops->flush_cache(ops);
93 }
94
__fib_rules_register(struct fib_rules_ops * ops)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 *
fib_rules_register(const struct fib_rules_ops * tmpl,struct net * net)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
fib_rules_cleanup_ops(struct fib_rules_ops * ops)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 fib_rule_put(rule);
155 }
156 }
157
fib_rules_put_rcu(struct rcu_head * head)158 static void fib_rules_put_rcu(struct rcu_head *head)
159 {
160 struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu);
161 struct net *net = ops->fro_net;
162
163 release_net(net);
164 kfree(ops);
165 }
166
fib_rules_unregister(struct fib_rules_ops * ops)167 void fib_rules_unregister(struct fib_rules_ops *ops)
168 {
169 struct net *net = ops->fro_net;
170
171 spin_lock(&net->rules_mod_lock);
172 list_del_rcu(&ops->list);
173 fib_rules_cleanup_ops(ops);
174 spin_unlock(&net->rules_mod_lock);
175
176 call_rcu(&ops->rcu, fib_rules_put_rcu);
177 }
178 EXPORT_SYMBOL_GPL(fib_rules_unregister);
179
fib_rule_match(struct fib_rule * rule,struct fib_rules_ops * ops,struct flowi * fl,int flags)180 static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
181 struct flowi *fl, int flags)
182 {
183 int ret = 0;
184
185 if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
186 goto out;
187
188 if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
189 goto out;
190
191 if ((rule->mark ^ fl->flowi_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
fib_rules_lookup(struct fib_rules_ops * ops,struct flowi * fl,int flags,struct fib_lookup_arg * arg)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
validate_rulemsg(struct fib_rule_hdr * frh,struct nlattr ** tb,struct fib_rules_ops * ops)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
fib_nl_newrule(struct sk_buff * skb,struct nlmsghdr * nlh,void * arg)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 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
fib_nl_delrule(struct sk_buff * skb,struct nlmsghdr * nlh,void * arg)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_get_table(frh, tb) &&
447 (frh_get_table(frh, tb) != rule->table))
448 continue;
449
450 if (tb[FRA_PRIORITY] &&
451 (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
452 continue;
453
454 if (tb[FRA_IIFNAME] &&
455 nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
456 continue;
457
458 if (tb[FRA_OIFNAME] &&
459 nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
460 continue;
461
462 if (tb[FRA_FWMARK] &&
463 (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
464 continue;
465
466 if (tb[FRA_FWMASK] &&
467 (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
468 continue;
469
470 if (!ops->compare(rule, frh, tb))
471 continue;
472
473 if (rule->flags & FIB_RULE_PERMANENT) {
474 err = -EPERM;
475 goto errout;
476 }
477
478 list_del_rcu(&rule->list);
479
480 if (rule->action == FR_ACT_GOTO) {
481 ops->nr_goto_rules--;
482 if (rtnl_dereference(rule->ctarget) == NULL)
483 ops->unresolved_rules--;
484 }
485
486 /*
487 * Check if this rule is a target to any of them. If so,
488 * disable them. As this operation is eventually very
489 * expensive, it is only performed if goto rules have
490 * actually been added.
491 */
492 if (ops->nr_goto_rules > 0) {
493 list_for_each_entry(tmp, &ops->rules_list, list) {
494 if (rtnl_dereference(tmp->ctarget) == rule) {
495 RCU_INIT_POINTER(tmp->ctarget, NULL);
496 ops->unresolved_rules++;
497 }
498 }
499 }
500
501 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
502 NETLINK_CB(skb).pid);
503 fib_rule_put(rule);
504 flush_route_cache(ops);
505 rules_ops_put(ops);
506 return 0;
507 }
508
509 err = -ENOENT;
510 errout:
511 rules_ops_put(ops);
512 return err;
513 }
514
fib_rule_nlmsg_size(struct fib_rules_ops * ops,struct fib_rule * rule)515 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
516 struct fib_rule *rule)
517 {
518 size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
519 + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
520 + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
521 + nla_total_size(4) /* FRA_PRIORITY */
522 + nla_total_size(4) /* FRA_TABLE */
523 + nla_total_size(4) /* FRA_FWMARK */
524 + nla_total_size(4); /* FRA_FWMASK */
525
526 if (ops->nlmsg_payload)
527 payload += ops->nlmsg_payload(rule);
528
529 return payload;
530 }
531
fib_nl_fill_rule(struct sk_buff * skb,struct fib_rule * rule,u32 pid,u32 seq,int type,int flags,struct fib_rules_ops * ops)532 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
533 u32 pid, u32 seq, int type, int flags,
534 struct fib_rules_ops *ops)
535 {
536 struct nlmsghdr *nlh;
537 struct fib_rule_hdr *frh;
538
539 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
540 if (nlh == NULL)
541 return -EMSGSIZE;
542
543 frh = nlmsg_data(nlh);
544 frh->family = ops->family;
545 frh->table = rule->table;
546 NLA_PUT_U32(skb, FRA_TABLE, rule->table);
547 frh->res1 = 0;
548 frh->res2 = 0;
549 frh->action = rule->action;
550 frh->flags = rule->flags;
551
552 if (rule->action == FR_ACT_GOTO &&
553 rcu_access_pointer(rule->ctarget) == NULL)
554 frh->flags |= FIB_RULE_UNRESOLVED;
555
556 if (rule->iifname[0]) {
557 NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname);
558
559 if (rule->iifindex == -1)
560 frh->flags |= FIB_RULE_IIF_DETACHED;
561 }
562
563 if (rule->oifname[0]) {
564 NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname);
565
566 if (rule->oifindex == -1)
567 frh->flags |= FIB_RULE_OIF_DETACHED;
568 }
569
570 if (rule->pref)
571 NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
572
573 if (rule->mark)
574 NLA_PUT_U32(skb, FRA_FWMARK, rule->mark);
575
576 if (rule->mark_mask || rule->mark)
577 NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask);
578
579 if (rule->target)
580 NLA_PUT_U32(skb, FRA_GOTO, rule->target);
581
582 if (ops->fill(rule, skb, frh) < 0)
583 goto nla_put_failure;
584
585 return nlmsg_end(skb, nlh);
586
587 nla_put_failure:
588 nlmsg_cancel(skb, nlh);
589 return -EMSGSIZE;
590 }
591
dump_rules(struct sk_buff * skb,struct netlink_callback * cb,struct fib_rules_ops * ops)592 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
593 struct fib_rules_ops *ops)
594 {
595 int idx = 0;
596 struct fib_rule *rule;
597
598 rcu_read_lock();
599 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
600 if (idx < cb->args[1])
601 goto skip;
602
603 if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
604 cb->nlh->nlmsg_seq, RTM_NEWRULE,
605 NLM_F_MULTI, ops) < 0)
606 break;
607 skip:
608 idx++;
609 }
610 rcu_read_unlock();
611 cb->args[1] = idx;
612 rules_ops_put(ops);
613
614 return skb->len;
615 }
616
fib_nl_dumprule(struct sk_buff * skb,struct netlink_callback * cb)617 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
618 {
619 struct net *net = sock_net(skb->sk);
620 struct fib_rules_ops *ops;
621 int idx = 0, family;
622
623 family = rtnl_msg_family(cb->nlh);
624 if (family != AF_UNSPEC) {
625 /* Protocol specific dump request */
626 ops = lookup_rules_ops(net, family);
627 if (ops == NULL)
628 return -EAFNOSUPPORT;
629
630 return dump_rules(skb, cb, ops);
631 }
632
633 rcu_read_lock();
634 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
635 if (idx < cb->args[0] || !try_module_get(ops->owner))
636 goto skip;
637
638 if (dump_rules(skb, cb, ops) < 0)
639 break;
640
641 cb->args[1] = 0;
642 skip:
643 idx++;
644 }
645 rcu_read_unlock();
646 cb->args[0] = idx;
647
648 return skb->len;
649 }
650
notify_rule_change(int event,struct fib_rule * rule,struct fib_rules_ops * ops,struct nlmsghdr * nlh,u32 pid)651 static void notify_rule_change(int event, struct fib_rule *rule,
652 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
653 u32 pid)
654 {
655 struct net *net;
656 struct sk_buff *skb;
657 int err = -ENOBUFS;
658
659 net = ops->fro_net;
660 skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
661 if (skb == NULL)
662 goto errout;
663
664 err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
665 if (err < 0) {
666 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
667 WARN_ON(err == -EMSGSIZE);
668 kfree_skb(skb);
669 goto errout;
670 }
671
672 rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
673 return;
674 errout:
675 if (err < 0)
676 rtnl_set_sk_err(net, ops->nlgroup, err);
677 }
678
attach_rules(struct list_head * rules,struct net_device * dev)679 static void attach_rules(struct list_head *rules, struct net_device *dev)
680 {
681 struct fib_rule *rule;
682
683 list_for_each_entry(rule, rules, list) {
684 if (rule->iifindex == -1 &&
685 strcmp(dev->name, rule->iifname) == 0)
686 rule->iifindex = dev->ifindex;
687 if (rule->oifindex == -1 &&
688 strcmp(dev->name, rule->oifname) == 0)
689 rule->oifindex = dev->ifindex;
690 }
691 }
692
detach_rules(struct list_head * rules,struct net_device * dev)693 static void detach_rules(struct list_head *rules, struct net_device *dev)
694 {
695 struct fib_rule *rule;
696
697 list_for_each_entry(rule, rules, list) {
698 if (rule->iifindex == dev->ifindex)
699 rule->iifindex = -1;
700 if (rule->oifindex == dev->ifindex)
701 rule->oifindex = -1;
702 }
703 }
704
705
fib_rules_event(struct notifier_block * this,unsigned long event,void * ptr)706 static int fib_rules_event(struct notifier_block *this, unsigned long event,
707 void *ptr)
708 {
709 struct net_device *dev = ptr;
710 struct net *net = dev_net(dev);
711 struct fib_rules_ops *ops;
712
713 ASSERT_RTNL();
714
715 switch (event) {
716 case NETDEV_REGISTER:
717 list_for_each_entry(ops, &net->rules_ops, list)
718 attach_rules(&ops->rules_list, dev);
719 break;
720
721 case NETDEV_CHANGENAME:
722 list_for_each_entry(ops, &net->rules_ops, list) {
723 detach_rules(&ops->rules_list, dev);
724 attach_rules(&ops->rules_list, dev);
725 }
726 break;
727
728 case NETDEV_UNREGISTER:
729 list_for_each_entry(ops, &net->rules_ops, list)
730 detach_rules(&ops->rules_list, dev);
731 break;
732 }
733
734 return NOTIFY_DONE;
735 }
736
737 static struct notifier_block fib_rules_notifier = {
738 .notifier_call = fib_rules_event,
739 };
740
fib_rules_net_init(struct net * net)741 static int __net_init fib_rules_net_init(struct net *net)
742 {
743 INIT_LIST_HEAD(&net->rules_ops);
744 spin_lock_init(&net->rules_mod_lock);
745 return 0;
746 }
747
748 static struct pernet_operations fib_rules_net_ops = {
749 .init = fib_rules_net_init,
750 };
751
fib_rules_init(void)752 static int __init fib_rules_init(void)
753 {
754 int err;
755 rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL);
756 rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL);
757 rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL);
758
759 err = register_pernet_subsys(&fib_rules_net_ops);
760 if (err < 0)
761 goto fail;
762
763 err = register_netdevice_notifier(&fib_rules_notifier);
764 if (err < 0)
765 goto fail_unregister;
766
767 return 0;
768
769 fail_unregister:
770 unregister_pernet_subsys(&fib_rules_net_ops);
771 fail:
772 rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
773 rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
774 rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
775 return err;
776 }
777
778 subsys_initcall(fib_rules_init);
779