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Linux 4.13.16
[linux/fpc-iii.git] / net / core / fib_rules.c
blobfdcb1bcd2afad5737a2c11fab55a3c214b86388d
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 #include <net/ip_tunnels.h>
20
21 static const struct fib_kuid_range fib_kuid_range_unset = {
22 KUIDT_INIT(0),
23 KUIDT_INIT(~0),
24 };
25
26 bool 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 }
38 EXPORT_SYMBOL_GPL(fib_rule_matchall);
39
40 int 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 /* The lock is not required here, the list in unreacheable
61 * at the moment this function is called */
62 list_add_tail(&r->list, &ops->rules_list);
63 return 0;
64 }
65 EXPORT_SYMBOL(fib_default_rule_add);
66
67 static 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
84 static void notify_rule_change(int event, struct fib_rule *rule,
85 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
86 u32 pid);
87
88 static 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
106 static void rules_ops_put(struct fib_rules_ops *ops)
107 {
108 if (ops)
109 module_put(ops->owner);
110 }
111
112 static void flush_route_cache(struct fib_rules_ops *ops)
113 {
114 if (ops->flush_cache)
115 ops->flush_cache(ops);
116 }
117
118 static 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;
141 errout:
142 spin_unlock(&net->rules_mod_lock);
143
144 return err;
145 }
146
147 struct fib_rules_ops *
148 fib_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 }
168 EXPORT_SYMBOL_GPL(fib_rules_register);
169
170 static 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
182 void 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 }
193 EXPORT_SYMBOL_GPL(fib_rules_unregister);
194
195 static int uid_range_set(struct fib_kuid_range *range)
196 {
197 return uid_valid(range->start) && uid_valid(range->end);
198 }
199
200 static 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
213 static 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
223 static 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);
249 out:
250 return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
251 }
252
253 int 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) {
262 jumped:
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;
295 out:
296 rcu_read_unlock();
297
298 return err;
299 }
300 EXPORT_SYMBOL_GPL(fib_rules_lookup);
301
302 static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
303 struct fib_rules_ops *ops)
304 {
305 int err = -EINVAL;
306
307 if (frh->src_len)
308 if (tb[FRA_SRC] == NULL ||
309 frh->src_len > (ops->addr_size * 8) ||
310 nla_len(tb[FRA_SRC]) != ops->addr_size)
311 goto errout;
312
313 if (frh->dst_len)
314 if (tb[FRA_DST] == NULL ||
315 frh->dst_len > (ops->addr_size * 8) ||
316 nla_len(tb[FRA_DST]) != ops->addr_size)
317 goto errout;
318
319 err = 0;
320 errout:
321 return err;
322 }
323
324 static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
325 struct nlattr **tb, struct fib_rule *rule)
326 {
327 struct fib_rule *r;
328
329 list_for_each_entry(r, &ops->rules_list, list) {
330 if (r->action != rule->action)
331 continue;
332
333 if (r->table != rule->table)
334 continue;
335
336 if (r->pref != rule->pref)
337 continue;
338
339 if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
340 continue;
341
342 if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
343 continue;
344
345 if (r->mark != rule->mark)
346 continue;
347
348 if (r->mark_mask != rule->mark_mask)
349 continue;
350
351 if (r->tun_id != rule->tun_id)
352 continue;
353
354 if (r->fr_net != rule->fr_net)
355 continue;
356
357 if (r->l3mdev != rule->l3mdev)
358 continue;
359
360 if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
361 !uid_eq(r->uid_range.end, rule->uid_range.end))
362 continue;
363
364 if (!ops->compare(r, frh, tb))
365 continue;
366 return 1;
367 }
368 return 0;
369 }
370
371 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
372 struct netlink_ext_ack *extack)
373 {
374 struct net *net = sock_net(skb->sk);
375 struct fib_rule_hdr *frh = nlmsg_data(nlh);
376 struct fib_rules_ops *ops = NULL;
377 struct fib_rule *rule, *r, *last = NULL;
378 struct nlattr *tb[FRA_MAX+1];
379 int err = -EINVAL, unresolved = 0;
380
381 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
382 goto errout;
383
384 ops = lookup_rules_ops(net, frh->family);
385 if (ops == NULL) {
386 err = -EAFNOSUPPORT;
387 goto errout;
388 }
389
390 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, extack);
391 if (err < 0)
392 goto errout;
393
394 err = validate_rulemsg(frh, tb, ops);
395 if (err < 0)
396 goto errout;
397
398 rule = kzalloc(ops->rule_size, GFP_KERNEL);
399 if (rule == NULL) {
400 err = -ENOMEM;
401 goto errout;
402 }
403 refcount_set(&rule->refcnt, 1);
404 rule->fr_net = net;
405
406 rule->pref = tb[FRA_PRIORITY] ? nla_get_u32(tb[FRA_PRIORITY])
407 : fib_default_rule_pref(ops);
408
409 if (tb[FRA_IIFNAME]) {
410 struct net_device *dev;
411
412 rule->iifindex = -1;
413 nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
414 dev = __dev_get_by_name(net, rule->iifname);
415 if (dev)
416 rule->iifindex = dev->ifindex;
417 }
418
419 if (tb[FRA_OIFNAME]) {
420 struct net_device *dev;
421
422 rule->oifindex = -1;
423 nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
424 dev = __dev_get_by_name(net, rule->oifname);
425 if (dev)
426 rule->oifindex = dev->ifindex;
427 }
428
429 if (tb[FRA_FWMARK]) {
430 rule->mark = nla_get_u32(tb[FRA_FWMARK]);
431 if (rule->mark)
432 /* compatibility: if the mark value is non-zero all bits
433 * are compared unless a mask is explicitly specified.
434 */
435 rule->mark_mask = 0xFFFFFFFF;
436 }
437
438 if (tb[FRA_FWMASK])
439 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
440
441 if (tb[FRA_TUN_ID])
442 rule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
443
444 err = -EINVAL;
445 if (tb[FRA_L3MDEV]) {
446 #ifdef CONFIG_NET_L3_MASTER_DEV
447 rule->l3mdev = nla_get_u8(tb[FRA_L3MDEV]);
448 if (rule->l3mdev != 1)
449 #endif
450 goto errout_free;
451 }
452
453 rule->action = frh->action;
454 rule->flags = frh->flags;
455 rule->table = frh_get_table(frh, tb);
456 if (tb[FRA_SUPPRESS_PREFIXLEN])
457 rule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
458 else
459 rule->suppress_prefixlen = -1;
460
461 if (tb[FRA_SUPPRESS_IFGROUP])
462 rule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
463 else
464 rule->suppress_ifgroup = -1;
465
466 if (tb[FRA_GOTO]) {
467 if (rule->action != FR_ACT_GOTO)
468 goto errout_free;
469
470 rule->target = nla_get_u32(tb[FRA_GOTO]);
471 /* Backward jumps are prohibited to avoid endless loops */
472 if (rule->target <= rule->pref)
473 goto errout_free;
474
475 list_for_each_entry(r, &ops->rules_list, list) {
476 if (r->pref == rule->target) {
477 RCU_INIT_POINTER(rule->ctarget, r);
478 break;
479 }
480 }
481
482 if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
483 unresolved = 1;
484 } else if (rule->action == FR_ACT_GOTO)
485 goto errout_free;
486
487 if (rule->l3mdev && rule->table)
488 goto errout_free;
489
490 if (tb[FRA_UID_RANGE]) {
491 if (current_user_ns() != net->user_ns) {
492 err = -EPERM;
493 goto errout_free;
494 }
495
496 rule->uid_range = nla_get_kuid_range(tb);
497
498 if (!uid_range_set(&rule->uid_range) ||
499 !uid_lte(rule->uid_range.start, rule->uid_range.end))
500 goto errout_free;
501 } else {
502 rule->uid_range = fib_kuid_range_unset;
503 }
504
505 if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
506 rule_exists(ops, frh, tb, rule)) {
507 err = -EEXIST;
508 goto errout_free;
509 }
510
511 err = ops->configure(rule, skb, frh, tb);
512 if (err < 0)
513 goto errout_free;
514
515 list_for_each_entry(r, &ops->rules_list, list) {
516 if (r->pref > rule->pref)
517 break;
518 last = r;
519 }
520
521 if (last)
522 list_add_rcu(&rule->list, &last->list);
523 else
524 list_add_rcu(&rule->list, &ops->rules_list);
525
526 if (ops->unresolved_rules) {
527 /*
528 * There are unresolved goto rules in the list, check if
529 * any of them are pointing to this new rule.
530 */
531 list_for_each_entry(r, &ops->rules_list, list) {
532 if (r->action == FR_ACT_GOTO &&
533 r->target == rule->pref &&
534 rtnl_dereference(r->ctarget) == NULL) {
535 rcu_assign_pointer(r->ctarget, rule);
536 if (--ops->unresolved_rules == 0)
537 break;
538 }
539 }
540 }
541
542 if (rule->action == FR_ACT_GOTO)
543 ops->nr_goto_rules++;
544
545 if (unresolved)
546 ops->unresolved_rules++;
547
548 if (rule->tun_id)
549 ip_tunnel_need_metadata();
550
551 notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
552 flush_route_cache(ops);
553 rules_ops_put(ops);
554 return 0;
555
556 errout_free:
557 kfree(rule);
558 errout:
559 rules_ops_put(ops);
560 return err;
561 }
562 EXPORT_SYMBOL_GPL(fib_nl_newrule);
563
564 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
565 struct netlink_ext_ack *extack)
566 {
567 struct net *net = sock_net(skb->sk);
568 struct fib_rule_hdr *frh = nlmsg_data(nlh);
569 struct fib_rules_ops *ops = NULL;
570 struct fib_rule *rule, *r;
571 struct nlattr *tb[FRA_MAX+1];
572 struct fib_kuid_range range;
573 int err = -EINVAL;
574
575 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
576 goto errout;
577
578 ops = lookup_rules_ops(net, frh->family);
579 if (ops == NULL) {
580 err = -EAFNOSUPPORT;
581 goto errout;
582 }
583
584 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, extack);
585 if (err < 0)
586 goto errout;
587
588 err = validate_rulemsg(frh, tb, ops);
589 if (err < 0)
590 goto errout;
591
592 if (tb[FRA_UID_RANGE]) {
593 range = nla_get_kuid_range(tb);
594 if (!uid_range_set(&range)) {
595 err = -EINVAL;
596 goto errout;
597 }
598 } else {
599 range = fib_kuid_range_unset;
600 }
601
602 list_for_each_entry(rule, &ops->rules_list, list) {
603 if (frh->action && (frh->action != rule->action))
604 continue;
605
606 if (frh_get_table(frh, tb) &&
607 (frh_get_table(frh, tb) != rule->table))
608 continue;
609
610 if (tb[FRA_PRIORITY] &&
611 (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
612 continue;
613
614 if (tb[FRA_IIFNAME] &&
615 nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
616 continue;
617
618 if (tb[FRA_OIFNAME] &&
619 nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
620 continue;
621
622 if (tb[FRA_FWMARK] &&
623 (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
624 continue;
625
626 if (tb[FRA_FWMASK] &&
627 (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
628 continue;
629
630 if (tb[FRA_TUN_ID] &&
631 (rule->tun_id != nla_get_be64(tb[FRA_TUN_ID])))
632 continue;
633
634 if (tb[FRA_L3MDEV] &&
635 (rule->l3mdev != nla_get_u8(tb[FRA_L3MDEV])))
636 continue;
637
638 if (uid_range_set(&range) &&
639 (!uid_eq(rule->uid_range.start, range.start) ||
640 !uid_eq(rule->uid_range.end, range.end)))
641 continue;
642
643 if (!ops->compare(rule, frh, tb))
644 continue;
645
646 if (rule->flags & FIB_RULE_PERMANENT) {
647 err = -EPERM;
648 goto errout;
649 }
650
651 if (ops->delete) {
652 err = ops->delete(rule);
653 if (err)
654 goto errout;
655 }
656
657 if (rule->tun_id)
658 ip_tunnel_unneed_metadata();
659
660 list_del_rcu(&rule->list);
661
662 if (rule->action == FR_ACT_GOTO) {
663 ops->nr_goto_rules--;
664 if (rtnl_dereference(rule->ctarget) == NULL)
665 ops->unresolved_rules--;
666 }
667
668 /*
669 * Check if this rule is a target to any of them. If so,
670 * adjust to the next one with the same preference or
671 * disable them. As this operation is eventually very
672 * expensive, it is only performed if goto rules, except
673 * current if it is goto rule, have actually been added.
674 */
675 if (ops->nr_goto_rules > 0) {
676 struct fib_rule *n;
677
678 n = list_next_entry(rule, list);
679 if (&n->list == &ops->rules_list || n->pref != rule->pref)
680 n = NULL;
681 list_for_each_entry(r, &ops->rules_list, list) {
682 if (rtnl_dereference(r->ctarget) != rule)
683 continue;
684 rcu_assign_pointer(r->ctarget, n);
685 if (!n)
686 ops->unresolved_rules++;
687 }
688 }
689
690 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
691 NETLINK_CB(skb).portid);
692 fib_rule_put(rule);
693 flush_route_cache(ops);
694 rules_ops_put(ops);
695 return 0;
696 }
697
698 err = -ENOENT;
699 errout:
700 rules_ops_put(ops);
701 return err;
702 }
703 EXPORT_SYMBOL_GPL(fib_nl_delrule);
704
705 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
706 struct fib_rule *rule)
707 {
708 size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
709 + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
710 + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
711 + nla_total_size(4) /* FRA_PRIORITY */
712 + nla_total_size(4) /* FRA_TABLE */
713 + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */
714 + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
715 + nla_total_size(4) /* FRA_FWMARK */
716 + nla_total_size(4) /* FRA_FWMASK */
717 + nla_total_size_64bit(8) /* FRA_TUN_ID */
718 + nla_total_size(sizeof(struct fib_kuid_range));
719
720 if (ops->nlmsg_payload)
721 payload += ops->nlmsg_payload(rule);
722
723 return payload;
724 }
725
726 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
727 u32 pid, u32 seq, int type, int flags,
728 struct fib_rules_ops *ops)
729 {
730 struct nlmsghdr *nlh;
731 struct fib_rule_hdr *frh;
732
733 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
734 if (nlh == NULL)
735 return -EMSGSIZE;
736
737 frh = nlmsg_data(nlh);
738 frh->family = ops->family;
739 frh->table = rule->table;
740 if (nla_put_u32(skb, FRA_TABLE, rule->table))
741 goto nla_put_failure;
742 if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
743 goto nla_put_failure;
744 frh->res1 = 0;
745 frh->res2 = 0;
746 frh->action = rule->action;
747 frh->flags = rule->flags;
748
749 if (rule->action == FR_ACT_GOTO &&
750 rcu_access_pointer(rule->ctarget) == NULL)
751 frh->flags |= FIB_RULE_UNRESOLVED;
752
753 if (rule->iifname[0]) {
754 if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
755 goto nla_put_failure;
756 if (rule->iifindex == -1)
757 frh->flags |= FIB_RULE_IIF_DETACHED;
758 }
759
760 if (rule->oifname[0]) {
761 if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
762 goto nla_put_failure;
763 if (rule->oifindex == -1)
764 frh->flags |= FIB_RULE_OIF_DETACHED;
765 }
766
767 if ((rule->pref &&
768 nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
769 (rule->mark &&
770 nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
771 ((rule->mark_mask || rule->mark) &&
772 nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
773 (rule->target &&
774 nla_put_u32(skb, FRA_GOTO, rule->target)) ||
775 (rule->tun_id &&
776 nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
777 (rule->l3mdev &&
778 nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
779 (uid_range_set(&rule->uid_range) &&
780 nla_put_uid_range(skb, &rule->uid_range)))
781 goto nla_put_failure;
782
783 if (rule->suppress_ifgroup != -1) {
784 if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
785 goto nla_put_failure;
786 }
787
788 if (ops->fill(rule, skb, frh) < 0)
789 goto nla_put_failure;
790
791 nlmsg_end(skb, nlh);
792 return 0;
793
794 nla_put_failure:
795 nlmsg_cancel(skb, nlh);
796 return -EMSGSIZE;
797 }
798
799 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
800 struct fib_rules_ops *ops)
801 {
802 int idx = 0;
803 struct fib_rule *rule;
804 int err = 0;
805
806 rcu_read_lock();
807 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
808 if (idx < cb->args[1])
809 goto skip;
810
811 err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
812 cb->nlh->nlmsg_seq, RTM_NEWRULE,
813 NLM_F_MULTI, ops);
814 if (err)
815 break;
816 skip:
817 idx++;
818 }
819 rcu_read_unlock();
820 cb->args[1] = idx;
821 rules_ops_put(ops);
822
823 return err;
824 }
825
826 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
827 {
828 struct net *net = sock_net(skb->sk);
829 struct fib_rules_ops *ops;
830 int idx = 0, family;
831
832 family = rtnl_msg_family(cb->nlh);
833 if (family != AF_UNSPEC) {
834 /* Protocol specific dump request */
835 ops = lookup_rules_ops(net, family);
836 if (ops == NULL)
837 return -EAFNOSUPPORT;
838
839 dump_rules(skb, cb, ops);
840
841 return skb->len;
842 }
843
844 rcu_read_lock();
845 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
846 if (idx < cb->args[0] || !try_module_get(ops->owner))
847 goto skip;
848
849 if (dump_rules(skb, cb, ops) < 0)
850 break;
851
852 cb->args[1] = 0;
853 skip:
854 idx++;
855 }
856 rcu_read_unlock();
857 cb->args[0] = idx;
858
859 return skb->len;
860 }
861
862 static void notify_rule_change(int event, struct fib_rule *rule,
863 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
864 u32 pid)
865 {
866 struct net *net;
867 struct sk_buff *skb;
868 int err = -ENOBUFS;
869
870 net = ops->fro_net;
871 skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
872 if (skb == NULL)
873 goto errout;
874
875 err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
876 if (err < 0) {
877 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
878 WARN_ON(err == -EMSGSIZE);
879 kfree_skb(skb);
880 goto errout;
881 }
882
883 rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
884 return;
885 errout:
886 if (err < 0)
887 rtnl_set_sk_err(net, ops->nlgroup, err);
888 }
889
890 static void attach_rules(struct list_head *rules, struct net_device *dev)
891 {
892 struct fib_rule *rule;
893
894 list_for_each_entry(rule, rules, list) {
895 if (rule->iifindex == -1 &&
896 strcmp(dev->name, rule->iifname) == 0)
897 rule->iifindex = dev->ifindex;
898 if (rule->oifindex == -1 &&
899 strcmp(dev->name, rule->oifname) == 0)
900 rule->oifindex = dev->ifindex;
901 }
902 }
903
904 static void detach_rules(struct list_head *rules, struct net_device *dev)
905 {
906 struct fib_rule *rule;
907
908 list_for_each_entry(rule, rules, list) {
909 if (rule->iifindex == dev->ifindex)
910 rule->iifindex = -1;
911 if (rule->oifindex == dev->ifindex)
912 rule->oifindex = -1;
913 }
914 }
915
916
917 static int fib_rules_event(struct notifier_block *this, unsigned long event,
918 void *ptr)
919 {
920 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
921 struct net *net = dev_net(dev);
922 struct fib_rules_ops *ops;
923
924 ASSERT_RTNL();
925
926 switch (event) {
927 case NETDEV_REGISTER:
928 list_for_each_entry(ops, &net->rules_ops, list)
929 attach_rules(&ops->rules_list, dev);
930 break;
931
932 case NETDEV_CHANGENAME:
933 list_for_each_entry(ops, &net->rules_ops, list) {
934 detach_rules(&ops->rules_list, dev);
935 attach_rules(&ops->rules_list, dev);
936 }
937 break;
938
939 case NETDEV_UNREGISTER:
940 list_for_each_entry(ops, &net->rules_ops, list)
941 detach_rules(&ops->rules_list, dev);
942 break;
943 }
944
945 return NOTIFY_DONE;
946 }
947
948 static struct notifier_block fib_rules_notifier = {
949 .notifier_call = fib_rules_event,
950 };
951
952 static int __net_init fib_rules_net_init(struct net *net)
953 {
954 INIT_LIST_HEAD(&net->rules_ops);
955 spin_lock_init(&net->rules_mod_lock);
956 return 0;
957 }
958
959 static struct pernet_operations fib_rules_net_ops = {
960 .init = fib_rules_net_init,
961 };
962
963 static int __init fib_rules_init(void)
964 {
965 int err;
966 rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL);
967 rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL);
968 rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL);
969
970 err = register_pernet_subsys(&fib_rules_net_ops);
971 if (err < 0)
972 goto fail;
973
974 err = register_netdevice_notifier(&fib_rules_notifier);
975 if (err < 0)
976 goto fail_unregister;
977
978 return 0;
979
980 fail_unregister:
981 unregister_pernet_subsys(&fib_rules_net_ops);
982 fail:
983 rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
984 rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
985 rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
986 return err;
987 }
988
989 subsys_initcall(fib_rules_init);
Linux with added FPC-III support