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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#include <net/ip_tunnels.h>
20
21static const struct fib_kuid_range fib_kuid_range_unset = {
22 KUIDT_INIT(0),
23 KUIDT_INIT(~0),
24};
25
26bool fib_rule_matchall(const struct fib_rule *rule)
27{
28 if (rule->iifindex || rule->oifindex || rule->mark || rule->tun_id ||
29 rule->flags)
30 return false;
31 if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
32 return false;
33 if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
34 !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
35 return false;
36 return true;
37}
38EXPORT_SYMBOL_GPL(fib_rule_matchall);
39
40int fib_default_rule_add(struct fib_rules_ops *ops,
41 u32 pref, u32 table, u32 flags)
42{
43 struct fib_rule *r;
44
45 r = kzalloc(ops->rule_size, GFP_KERNEL);
46 if (r == NULL)
47 return -ENOMEM;
48
49 refcount_set(&r->refcnt, 1);
50 r->action = FR_ACT_TO_TBL;
51 r->pref = pref;
52 r->table = table;
53 r->flags = flags;
54 r->fr_net = ops->fro_net;
55 r->uid_range = fib_kuid_range_unset;
56
57 r->suppress_prefixlen = -1;
58 r->suppress_ifgroup = -1;
59
60
61
62 list_add_tail(&r->list, &ops->rules_list);
63 return 0;
64}
65EXPORT_SYMBOL(fib_default_rule_add);
66
67static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
68{
69 struct list_head *pos;
70 struct fib_rule *rule;
71
72 if (!list_empty(&ops->rules_list)) {
73 pos = ops->rules_list.next;
74 if (pos->next != &ops->rules_list) {
75 rule = list_entry(pos->next, struct fib_rule, list);
76 if (rule->pref)
77 return rule->pref - 1;
78 }
79 }
80
81 return 0;
82}
83
84static void notify_rule_change(int event, struct fib_rule *rule,
85 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
86 u32 pid);
87
88static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
89{
90 struct fib_rules_ops *ops;
91
92 rcu_read_lock();
93 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
94 if (ops->family == family) {
95 if (!try_module_get(ops->owner))
96 ops = NULL;
97 rcu_read_unlock();
98 return ops;
99 }
100 }
101 rcu_read_unlock();
102
103 return NULL;
104}
105
106static void rules_ops_put(struct fib_rules_ops *ops)
107{
108 if (ops)
109 module_put(ops->owner);
110}
111
112static void flush_route_cache(struct fib_rules_ops *ops)
113{
114 if (ops->flush_cache)
115 ops->flush_cache(ops);
116}
117
118static int __fib_rules_register(struct fib_rules_ops *ops)
119{
120 int err = -EEXIST;
121 struct fib_rules_ops *o;
122 struct net *net;
123
124 net = ops->fro_net;
125
126 if (ops->rule_size < sizeof(struct fib_rule))
127 return -EINVAL;
128
129 if (ops->match == NULL || ops->configure == NULL ||
130 ops->compare == NULL || ops->fill == NULL ||
131 ops->action == NULL)
132 return -EINVAL;
133
134 spin_lock(&net->rules_mod_lock);
135 list_for_each_entry(o, &net->rules_ops, list)
136 if (ops->family == o->family)
137 goto errout;
138
139 list_add_tail_rcu(&ops->list, &net->rules_ops);
140 err = 0;
141errout:
142 spin_unlock(&net->rules_mod_lock);
143
144 return err;
145}
146
147struct fib_rules_ops *
148fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
149{
150 struct fib_rules_ops *ops;
151 int err;
152
153 ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
154 if (ops == NULL)
155 return ERR_PTR(-ENOMEM);
156
157 INIT_LIST_HEAD(&ops->rules_list);
158 ops->fro_net = net;
159
160 err = __fib_rules_register(ops);
161 if (err) {
162 kfree(ops);
163 ops = ERR_PTR(err);
164 }
165
166 return ops;
167}
168EXPORT_SYMBOL_GPL(fib_rules_register);
169
170static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
171{
172 struct fib_rule *rule, *tmp;
173
174 list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
175 list_del_rcu(&rule->list);
176 if (ops->delete)
177 ops->delete(rule);
178 fib_rule_put(rule);
179 }
180}
181
182void fib_rules_unregister(struct fib_rules_ops *ops)
183{
184 struct net *net = ops->fro_net;
185
186 spin_lock(&net->rules_mod_lock);
187 list_del_rcu(&ops->list);
188 spin_unlock(&net->rules_mod_lock);
189
190 fib_rules_cleanup_ops(ops);
191 kfree_rcu(ops, rcu);
192}
193EXPORT_SYMBOL_GPL(fib_rules_unregister);
194
195static int uid_range_set(struct fib_kuid_range *range)
196{
197 return uid_valid(range->start) && uid_valid(range->end);
198}
199
200static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
201{
202 struct fib_rule_uid_range *in;
203 struct fib_kuid_range out;
204
205 in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);
206
207 out.start = make_kuid(current_user_ns(), in->start);
208 out.end = make_kuid(current_user_ns(), in->end);
209
210 return out;
211}
212
213static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
214{
215 struct fib_rule_uid_range out = {
216 from_kuid_munged(current_user_ns(), range->start),
217 from_kuid_munged(current_user_ns(), range->end)
218 };
219
220 return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
221}
222
223static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
224 struct flowi *fl, int flags,
225 struct fib_lookup_arg *arg)
226{
227 int ret = 0;
228
229 if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
230 goto out;
231
232 if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
233 goto out;
234
235 if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
236 goto out;
237
238 if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
239 goto out;
240
241 if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
242 goto out;
243
244 if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
245 uid_gt(fl->flowi_uid, rule->uid_range.end))
246 goto out;
247
248 ret = ops->match(rule, fl, flags);
249out:
250 return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
251}
252
253int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
254 int flags, struct fib_lookup_arg *arg)
255{
256 struct fib_rule *rule;
257 int err;
258
259 rcu_read_lock();
260
261 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
262jumped:
263 if (!fib_rule_match(rule, ops, fl, flags, arg))
264 continue;
265
266 if (rule->action == FR_ACT_GOTO) {
267 struct fib_rule *target;
268
269 target = rcu_dereference(rule->ctarget);
270 if (target == NULL) {
271 continue;
272 } else {
273 rule = target;
274 goto jumped;
275 }
276 } else if (rule->action == FR_ACT_NOP)
277 continue;
278 else
279 err = ops->action(rule, fl, flags, arg);
280
281 if (!err && ops->suppress && ops->suppress(rule, arg))
282 continue;
283
284 if (err != -EAGAIN) {
285 if ((arg->flags & FIB_LOOKUP_NOREF) ||
286 likely(refcount_inc_not_zero(&rule->refcnt))) {
287 arg->rule = rule;
288 goto out;
289 }
290 break;
291 }
292 }
293
294 err = -ESRCH;
295out:
296 rcu_read_unlock();
297
298 return err;
299}
300EXPORT_SYMBOL_GPL(fib_rules_lookup);
301
302static int call_fib_rule_notifier(struct notifier_block *nb, struct net *net,
303 enum fib_event_type event_type,
304 struct fib_rule *rule, int family)
305{
306 struct fib_rule_notifier_info info = {
307 .info.family = family,
308 .rule = rule,
309 };
310
311 return call_fib_notifier(nb, net, event_type, &info.info);
312}
313
314static int call_fib_rule_notifiers(struct net *net,
315 enum fib_event_type event_type,
316 struct fib_rule *rule,
317 struct fib_rules_ops *ops)
318{
319 struct fib_rule_notifier_info info = {
320 .info.family = ops->family,
321 .rule = rule,
322 };
323
324 ops->fib_rules_seq++;
325 return call_fib_notifiers(net, event_type, &info.info);
326}
327
328
329int fib_rules_dump(struct net *net, struct notifier_block *nb, int family)
330{
331 struct fib_rules_ops *ops;
332 struct fib_rule *rule;
333
334 ops = lookup_rules_ops(net, family);
335 if (!ops)
336 return -EAFNOSUPPORT;
337 list_for_each_entry_rcu(rule, &ops->rules_list, list)
338 call_fib_rule_notifier(nb, net, FIB_EVENT_RULE_ADD, rule,
339 family);
340 rules_ops_put(ops);
341
342 return 0;
343}
344EXPORT_SYMBOL_GPL(fib_rules_dump);
345
346unsigned int fib_rules_seq_read(struct net *net, int family)
347{
348 unsigned int fib_rules_seq;
349 struct fib_rules_ops *ops;
350
351 ASSERT_RTNL();
352
353 ops = lookup_rules_ops(net, family);
354 if (!ops)
355 return 0;
356 fib_rules_seq = ops->fib_rules_seq;
357 rules_ops_put(ops);
358
359 return fib_rules_seq;
360}
361EXPORT_SYMBOL_GPL(fib_rules_seq_read);
362
363static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
364 struct fib_rules_ops *ops)
365{
366 int err = -EINVAL;
367
368 if (frh->src_len)
369 if (tb[FRA_SRC] == NULL ||
370 frh->src_len > (ops->addr_size * 8) ||
371 nla_len(tb[FRA_SRC]) != ops->addr_size)
372 goto errout;
373
374 if (frh->dst_len)
375 if (tb[FRA_DST] == NULL ||
376 frh->dst_len > (ops->addr_size * 8) ||
377 nla_len(tb[FRA_DST]) != ops->addr_size)
378 goto errout;
379
380 err = 0;
381errout:
382 return err;
383}
384
385static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
386 struct nlattr **tb, struct fib_rule *rule)
387{
388 struct fib_rule *r;
389
390 list_for_each_entry(r, &ops->rules_list, list) {
391 if (r->action != rule->action)
392 continue;
393
394 if (r->table != rule->table)
395 continue;
396
397 if (r->pref != rule->pref)
398 continue;
399
400 if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
401 continue;
402
403 if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
404 continue;
405
406 if (r->mark != rule->mark)
407 continue;
408
409 if (r->mark_mask != rule->mark_mask)
410 continue;
411
412 if (r->tun_id != rule->tun_id)
413 continue;
414
415 if (r->fr_net != rule->fr_net)
416 continue;
417
418 if (r->l3mdev != rule->l3mdev)
419 continue;
420
421 if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
422 !uid_eq(r->uid_range.end, rule->uid_range.end))
423 continue;
424
425 if (!ops->compare(r, frh, tb))
426 continue;
427 return 1;
428 }
429 return 0;
430}
431
432int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
433 struct netlink_ext_ack *extack)
434{
435 struct net *net = sock_net(skb->sk);
436 struct fib_rule_hdr *frh = nlmsg_data(nlh);
437 struct fib_rules_ops *ops = NULL;
438 struct fib_rule *rule, *r, *last = NULL;
439 struct nlattr *tb[FRA_MAX+1];
440 int err = -EINVAL, unresolved = 0;
441
442 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
443 goto errout;
444
445 ops = lookup_rules_ops(net, frh->family);
446 if (ops == NULL) {
447 err = -EAFNOSUPPORT;
448 goto errout;
449 }
450
451 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, extack);
452 if (err < 0)
453 goto errout;
454
455 err = validate_rulemsg(frh, tb, ops);
456 if (err < 0)
457 goto errout;
458
459 rule = kzalloc(ops->rule_size, GFP_KERNEL);
460 if (rule == NULL) {
461 err = -ENOMEM;
462 goto errout;
463 }
464 refcount_set(&rule->refcnt, 1);
465 rule->fr_net = net;
466
467 rule->pref = tb[FRA_PRIORITY] ? nla_get_u32(tb[FRA_PRIORITY])
468 : fib_default_rule_pref(ops);
469
470 if (tb[FRA_IIFNAME]) {
471 struct net_device *dev;
472
473 rule->iifindex = -1;
474 nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
475 dev = __dev_get_by_name(net, rule->iifname);
476 if (dev)
477 rule->iifindex = dev->ifindex;
478 }
479
480 if (tb[FRA_OIFNAME]) {
481 struct net_device *dev;
482
483 rule->oifindex = -1;
484 nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
485 dev = __dev_get_by_name(net, rule->oifname);
486 if (dev)
487 rule->oifindex = dev->ifindex;
488 }
489
490 if (tb[FRA_FWMARK]) {
491 rule->mark = nla_get_u32(tb[FRA_FWMARK]);
492 if (rule->mark)
493
494
495
496 rule->mark_mask = 0xFFFFFFFF;
497 }
498
499 if (tb[FRA_FWMASK])
500 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
501
502 if (tb[FRA_TUN_ID])
503 rule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
504
505 err = -EINVAL;
506 if (tb[FRA_L3MDEV]) {
507#ifdef CONFIG_NET_L3_MASTER_DEV
508 rule->l3mdev = nla_get_u8(tb[FRA_L3MDEV]);
509 if (rule->l3mdev != 1)
510#endif
511 goto errout_free;
512 }
513
514 rule->action = frh->action;
515 rule->flags = frh->flags;
516 rule->table = frh_get_table(frh, tb);
517 if (tb[FRA_SUPPRESS_PREFIXLEN])
518 rule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
519 else
520 rule->suppress_prefixlen = -1;
521
522 if (tb[FRA_SUPPRESS_IFGROUP])
523 rule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
524 else
525 rule->suppress_ifgroup = -1;
526
527 if (tb[FRA_GOTO]) {
528 if (rule->action != FR_ACT_GOTO)
529 goto errout_free;
530
531 rule->target = nla_get_u32(tb[FRA_GOTO]);
532
533 if (rule->target <= rule->pref)
534 goto errout_free;
535
536 list_for_each_entry(r, &ops->rules_list, list) {
537 if (r->pref == rule->target) {
538 RCU_INIT_POINTER(rule->ctarget, r);
539 break;
540 }
541 }
542
543 if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
544 unresolved = 1;
545 } else if (rule->action == FR_ACT_GOTO)
546 goto errout_free;
547
548 if (rule->l3mdev && rule->table)
549 goto errout_free;
550
551 if (tb[FRA_UID_RANGE]) {
552 if (current_user_ns() != net->user_ns) {
553 err = -EPERM;
554 goto errout_free;
555 }
556
557 rule->uid_range = nla_get_kuid_range(tb);
558
559 if (!uid_range_set(&rule->uid_range) ||
560 !uid_lte(rule->uid_range.start, rule->uid_range.end))
561 goto errout_free;
562 } else {
563 rule->uid_range = fib_kuid_range_unset;
564 }
565
566 if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
567 rule_exists(ops, frh, tb, rule)) {
568 err = -EEXIST;
569 goto errout_free;
570 }
571
572 err = ops->configure(rule, skb, frh, tb);
573 if (err < 0)
574 goto errout_free;
575
576 list_for_each_entry(r, &ops->rules_list, list) {
577 if (r->pref > rule->pref)
578 break;
579 last = r;
580 }
581
582 if (last)
583 list_add_rcu(&rule->list, &last->list);
584 else
585 list_add_rcu(&rule->list, &ops->rules_list);
586
587 if (ops->unresolved_rules) {
588
589
590
591
592 list_for_each_entry(r, &ops->rules_list, list) {
593 if (r->action == FR_ACT_GOTO &&
594 r->target == rule->pref &&
595 rtnl_dereference(r->ctarget) == NULL) {
596 rcu_assign_pointer(r->ctarget, rule);
597 if (--ops->unresolved_rules == 0)
598 break;
599 }
600 }
601 }
602
603 if (rule->action == FR_ACT_GOTO)
604 ops->nr_goto_rules++;
605
606 if (unresolved)
607 ops->unresolved_rules++;
608
609 if (rule->tun_id)
610 ip_tunnel_need_metadata();
611
612 call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule, ops);
613 notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
614 flush_route_cache(ops);
615 rules_ops_put(ops);
616 return 0;
617
618errout_free:
619 kfree(rule);
620errout:
621 rules_ops_put(ops);
622 return err;
623}
624EXPORT_SYMBOL_GPL(fib_nl_newrule);
625
626int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
627 struct netlink_ext_ack *extack)
628{
629 struct net *net = sock_net(skb->sk);
630 struct fib_rule_hdr *frh = nlmsg_data(nlh);
631 struct fib_rules_ops *ops = NULL;
632 struct fib_rule *rule, *r;
633 struct nlattr *tb[FRA_MAX+1];
634 struct fib_kuid_range range;
635 int err = -EINVAL;
636
637 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
638 goto errout;
639
640 ops = lookup_rules_ops(net, frh->family);
641 if (ops == NULL) {
642 err = -EAFNOSUPPORT;
643 goto errout;
644 }
645
646 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, extack);
647 if (err < 0)
648 goto errout;
649
650 err = validate_rulemsg(frh, tb, ops);
651 if (err < 0)
652 goto errout;
653
654 if (tb[FRA_UID_RANGE]) {
655 range = nla_get_kuid_range(tb);
656 if (!uid_range_set(&range)) {
657 err = -EINVAL;
658 goto errout;
659 }
660 } else {
661 range = fib_kuid_range_unset;
662 }
663
664 list_for_each_entry(rule, &ops->rules_list, list) {
665 if (frh->action && (frh->action != rule->action))
666 continue;
667
668 if (frh_get_table(frh, tb) &&
669 (frh_get_table(frh, tb) != rule->table))
670 continue;
671
672 if (tb[FRA_PRIORITY] &&
673 (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
674 continue;
675
676 if (tb[FRA_IIFNAME] &&
677 nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
678 continue;
679
680 if (tb[FRA_OIFNAME] &&
681 nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
682 continue;
683
684 if (tb[FRA_FWMARK] &&
685 (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
686 continue;
687
688 if (tb[FRA_FWMASK] &&
689 (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
690 continue;
691
692 if (tb[FRA_TUN_ID] &&
693 (rule->tun_id != nla_get_be64(tb[FRA_TUN_ID])))
694 continue;
695
696 if (tb[FRA_L3MDEV] &&
697 (rule->l3mdev != nla_get_u8(tb[FRA_L3MDEV])))
698 continue;
699
700 if (uid_range_set(&range) &&
701 (!uid_eq(rule->uid_range.start, range.start) ||
702 !uid_eq(rule->uid_range.end, range.end)))
703 continue;
704
705 if (!ops->compare(rule, frh, tb))
706 continue;
707
708 if (rule->flags & FIB_RULE_PERMANENT) {
709 err = -EPERM;
710 goto errout;
711 }
712
713 if (ops->delete) {
714 err = ops->delete(rule);
715 if (err)
716 goto errout;
717 }
718
719 if (rule->tun_id)
720 ip_tunnel_unneed_metadata();
721
722 list_del_rcu(&rule->list);
723
724 if (rule->action == FR_ACT_GOTO) {
725 ops->nr_goto_rules--;
726 if (rtnl_dereference(rule->ctarget) == NULL)
727 ops->unresolved_rules--;
728 }
729
730
731
732
733
734
735
736
737 if (ops->nr_goto_rules > 0) {
738 struct fib_rule *n;
739
740 n = list_next_entry(rule, list);
741 if (&n->list == &ops->rules_list || n->pref != rule->pref)
742 n = NULL;
743 list_for_each_entry(r, &ops->rules_list, list) {
744 if (rtnl_dereference(r->ctarget) != rule)
745 continue;
746 rcu_assign_pointer(r->ctarget, n);
747 if (!n)
748 ops->unresolved_rules++;
749 }
750 }
751
752 call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule, ops);
753 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
754 NETLINK_CB(skb).portid);
755 fib_rule_put(rule);
756 flush_route_cache(ops);
757 rules_ops_put(ops);
758 return 0;
759 }
760
761 err = -ENOENT;
762errout:
763 rules_ops_put(ops);
764 return err;
765}
766EXPORT_SYMBOL_GPL(fib_nl_delrule);
767
768static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
769 struct fib_rule *rule)
770{
771 size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
772 + nla_total_size(IFNAMSIZ)
773 + nla_total_size(IFNAMSIZ)
774 + nla_total_size(4)
775 + nla_total_size(4)
776 + nla_total_size(4)
777 + nla_total_size(4)
778 + nla_total_size(4)
779 + nla_total_size(4)
780 + nla_total_size_64bit(8)
781 + nla_total_size(sizeof(struct fib_kuid_range));
782
783 if (ops->nlmsg_payload)
784 payload += ops->nlmsg_payload(rule);
785
786 return payload;
787}
788
789static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
790 u32 pid, u32 seq, int type, int flags,
791 struct fib_rules_ops *ops)
792{
793 struct nlmsghdr *nlh;
794 struct fib_rule_hdr *frh;
795
796 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
797 if (nlh == NULL)
798 return -EMSGSIZE;
799
800 frh = nlmsg_data(nlh);
801 frh->family = ops->family;
802 frh->table = rule->table;
803 if (nla_put_u32(skb, FRA_TABLE, rule->table))
804 goto nla_put_failure;
805 if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
806 goto nla_put_failure;
807 frh->res1 = 0;
808 frh->res2 = 0;
809 frh->action = rule->action;
810 frh->flags = rule->flags;
811
812 if (rule->action == FR_ACT_GOTO &&
813 rcu_access_pointer(rule->ctarget) == NULL)
814 frh->flags |= FIB_RULE_UNRESOLVED;
815
816 if (rule->iifname[0]) {
817 if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
818 goto nla_put_failure;
819 if (rule->iifindex == -1)
820 frh->flags |= FIB_RULE_IIF_DETACHED;
821 }
822
823 if (rule->oifname[0]) {
824 if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
825 goto nla_put_failure;
826 if (rule->oifindex == -1)
827 frh->flags |= FIB_RULE_OIF_DETACHED;
828 }
829
830 if ((rule->pref &&
831 nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
832 (rule->mark &&
833 nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
834 ((rule->mark_mask || rule->mark) &&
835 nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
836 (rule->target &&
837 nla_put_u32(skb, FRA_GOTO, rule->target)) ||
838 (rule->tun_id &&
839 nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
840 (rule->l3mdev &&
841 nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
842 (uid_range_set(&rule->uid_range) &&
843 nla_put_uid_range(skb, &rule->uid_range)))
844 goto nla_put_failure;
845
846 if (rule->suppress_ifgroup != -1) {
847 if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
848 goto nla_put_failure;
849 }
850
851 if (ops->fill(rule, skb, frh) < 0)
852 goto nla_put_failure;
853
854 nlmsg_end(skb, nlh);
855 return 0;
856
857nla_put_failure:
858 nlmsg_cancel(skb, nlh);
859 return -EMSGSIZE;
860}
861
862static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
863 struct fib_rules_ops *ops)
864{
865 int idx = 0;
866 struct fib_rule *rule;
867 int err = 0;
868
869 rcu_read_lock();
870 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
871 if (idx < cb->args[1])
872 goto skip;
873
874 err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
875 cb->nlh->nlmsg_seq, RTM_NEWRULE,
876 NLM_F_MULTI, ops);
877 if (err)
878 break;
879skip:
880 idx++;
881 }
882 rcu_read_unlock();
883 cb->args[1] = idx;
884 rules_ops_put(ops);
885
886 return err;
887}
888
889static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
890{
891 struct net *net = sock_net(skb->sk);
892 struct fib_rules_ops *ops;
893 int idx = 0, family;
894
895 family = rtnl_msg_family(cb->nlh);
896 if (family != AF_UNSPEC) {
897
898 ops = lookup_rules_ops(net, family);
899 if (ops == NULL)
900 return -EAFNOSUPPORT;
901
902 dump_rules(skb, cb, ops);
903
904 return skb->len;
905 }
906
907 rcu_read_lock();
908 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
909 if (idx < cb->args[0] || !try_module_get(ops->owner))
910 goto skip;
911
912 if (dump_rules(skb, cb, ops) < 0)
913 break;
914
915 cb->args[1] = 0;
916skip:
917 idx++;
918 }
919 rcu_read_unlock();
920 cb->args[0] = idx;
921
922 return skb->len;
923}
924
925static void notify_rule_change(int event, struct fib_rule *rule,
926 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
927 u32 pid)
928{
929 struct net *net;
930 struct sk_buff *skb;
931 int err = -ENOBUFS;
932
933 net = ops->fro_net;
934 skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
935 if (skb == NULL)
936 goto errout;
937
938 err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
939 if (err < 0) {
940
941 WARN_ON(err == -EMSGSIZE);
942 kfree_skb(skb);
943 goto errout;
944 }
945
946 rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
947 return;
948errout:
949 if (err < 0)
950 rtnl_set_sk_err(net, ops->nlgroup, err);
951}
952
953static void attach_rules(struct list_head *rules, struct net_device *dev)
954{
955 struct fib_rule *rule;
956
957 list_for_each_entry(rule, rules, list) {
958 if (rule->iifindex == -1 &&
959 strcmp(dev->name, rule->iifname) == 0)
960 rule->iifindex = dev->ifindex;
961 if (rule->oifindex == -1 &&
962 strcmp(dev->name, rule->oifname) == 0)
963 rule->oifindex = dev->ifindex;
964 }
965}
966
967static void detach_rules(struct list_head *rules, struct net_device *dev)
968{
969 struct fib_rule *rule;
970
971 list_for_each_entry(rule, rules, list) {
972 if (rule->iifindex == dev->ifindex)
973 rule->iifindex = -1;
974 if (rule->oifindex == dev->ifindex)
975 rule->oifindex = -1;
976 }
977}
978
979
980static int fib_rules_event(struct notifier_block *this, unsigned long event,
981 void *ptr)
982{
983 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
984 struct net *net = dev_net(dev);
985 struct fib_rules_ops *ops;
986
987 ASSERT_RTNL();
988
989 switch (event) {
990 case NETDEV_REGISTER:
991 list_for_each_entry(ops, &net->rules_ops, list)
992 attach_rules(&ops->rules_list, dev);
993 break;
994
995 case NETDEV_CHANGENAME:
996 list_for_each_entry(ops, &net->rules_ops, list) {
997 detach_rules(&ops->rules_list, dev);
998 attach_rules(&ops->rules_list, dev);
999 }
1000 break;
1001
1002 case NETDEV_UNREGISTER:
1003 list_for_each_entry(ops, &net->rules_ops, list)
1004 detach_rules(&ops->rules_list, dev);
1005 break;
1006 }
1007
1008 return NOTIFY_DONE;
1009}
1010
1011static struct notifier_block fib_rules_notifier = {
1012 .notifier_call = fib_rules_event,
1013};
1014
1015static int __net_init fib_rules_net_init(struct net *net)
1016{
1017 INIT_LIST_HEAD(&net->rules_ops);
1018 spin_lock_init(&net->rules_mod_lock);
1019 return 0;
1020}
1021
1022static struct pernet_operations fib_rules_net_ops = {
1023 .init = fib_rules_net_init,
1024};
1025
1026static int __init fib_rules_init(void)
1027{
1028 int err;
1029 rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, 0);
1030 rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, 0);
1031 rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, 0);
1032
1033 err = register_pernet_subsys(&fib_rules_net_ops);
1034 if (err < 0)
1035 goto fail;
1036
1037 err = register_netdevice_notifier(&fib_rules_notifier);
1038 if (err < 0)
1039 goto fail_unregister;
1040
1041 return 0;
1042
1043fail_unregister:
1044 unregister_pernet_subsys(&fib_rules_net_ops);
1045fail:
1046 rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
1047 rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
1048 rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
1049 return err;
1050}
1051
1052subsys_initcall(fib_rules_init);
1053
