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net: rtnetlink: plumb extended ack to doit function
[linux-2.6-block.git] / net / core / fib_rules.c
CommitLineData
14c0b97d
TG		 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
14c0b97d
TG		 11#include <linux/types.h>
12#include <linux/kernel.h>
5a0e3ad6 13#include <linux/slab.h>
14c0b97d 14#include <linux/list.h>
3a9a231d 15#include <linux/module.h>
e9dc8653 16#include <net/net_namespace.h>
881d966b 17#include <net/sock.h>
14c0b97d 18#include <net/fib_rules.h>
e7030878 19#include <net/ip_tunnels.h>
14c0b97d 20
622ec2c9
LC		 21static const struct fib_kuid_range fib_kuid_range_unset = {
22 KUIDT_INIT(0),
23 KUIDT_INIT(~0),
24};
25
3c71006d
IS		 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
2994c638
DL		 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 atomic_set(&r->refcnt, 1);
50 r->action = FR_ACT_TO_TBL;
51 r->pref = pref;
52 r->table = table;
53 r->flags = flags;
efd7ef1c 54 r->fr_net = ops->fro_net;
622ec2c9 55 r->uid_range = fib_kuid_range_unset;
2994c638 56
73f5698e
ST		 57 r->suppress_prefixlen = -1;
58 r->suppress_ifgroup = -1;
59
2994c638
DL		 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}
65EXPORT_SYMBOL(fib_default_rule_add);
66
f53de1e9 67static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
d8a566be
PM		 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}
d8a566be 83
9e3a5487 84static void notify_rule_change(int event, struct fib_rule *rule,
c17084d2
TG		 85 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
86 u32 pid);
14c0b97d 87
5fd30ee7 88static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
14c0b97d
TG		 89{
90 struct fib_rules_ops *ops;
91
92 rcu_read_lock();
5fd30ee7 93 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
14c0b97d
TG		 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
73417f61
TG		 112static void flush_route_cache(struct fib_rules_ops *ops)
113{
114 if (ops->flush_cache)
ae299fc0 115 ops->flush_cache(ops);
73417f61
TG		 116}
117
e9c5158a 118static int __fib_rules_register(struct fib_rules_ops *ops)
14c0b97d
TG		 119{
120 int err = -EEXIST;
121 struct fib_rules_ops *o;
9e3a5487
DL		 122 struct net *net;
123
124 net = ops->fro_net;
14c0b97d
TG		 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
5fd30ee7
DL		 134 spin_lock(&net->rules_mod_lock);
135 list_for_each_entry(o, &net->rules_ops, list)
14c0b97d
TG		 136 if (ops->family == o->family)
137 goto errout;
138
5fd30ee7 139 list_add_tail_rcu(&ops->list, &net->rules_ops);
14c0b97d
TG		 140 err = 0;
141errout:
5fd30ee7 142 spin_unlock(&net->rules_mod_lock);
14c0b97d
TG		 143
144 return err;
145}
146
e9c5158a 147struct fib_rules_ops *
3d0c9c4e 148fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
e9c5158a
EB		 149{
150 struct fib_rules_ops *ops;
151 int err;
152
2fb3573d 153 ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
e9c5158a
EB		 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}
14c0b97d
TG		 168EXPORT_SYMBOL_GPL(fib_rules_register);
169
1df9916e 170static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
14c0b97d
TG		 171{
172 struct fib_rule *rule, *tmp;
173
76c72d4f 174 list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
14c0b97d 175 list_del_rcu(&rule->list);
7a9bc9b8
DM		 176 if (ops->delete)
177 ops->delete(rule);
14c0b97d
TG		 178 fib_rule_put(rule);
179 }
180}
181
9e3a5487 182void fib_rules_unregister(struct fib_rules_ops *ops)
14c0b97d 183{
9e3a5487 184 struct net *net = ops->fro_net;
14c0b97d 185
5fd30ee7 186 spin_lock(&net->rules_mod_lock);
72132c1b 187 list_del_rcu(&ops->list);
5fd30ee7 188 spin_unlock(&net->rules_mod_lock);
14c0b97d 189
419df12f 190 fib_rules_cleanup_ops(ops);
efd7ef1c 191 kfree_rcu(ops, rcu);
14c0b97d 192}
14c0b97d
TG		 193EXPORT_SYMBOL_GPL(fib_rules_unregister);
194
622ec2c9
LC		 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
3dfbcc41 223static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
96c63fa7
DA		 224 struct flowi *fl, int flags,
225 struct fib_lookup_arg *arg)
3dfbcc41
TG		 226{
227 int ret = 0;
228
1d28f42c 229 if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
3dfbcc41
TG		 230 goto out;
231
1d28f42c 232 if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
1b038a5e
PM		 233 goto out;
234
1d28f42c 235 if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
3dfbcc41
TG		 236 goto out;
237
e7030878
TG		 238 if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
239 goto out;
240
96c63fa7
DA		 241 if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
242 goto out;
243
622ec2c9
LC		 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
3dfbcc41
TG		 248 ret = ops->match(rule, fl, flags);
249out:
250 return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
251}
252
14c0b97d
TG		 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
76c72d4f 261 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
0947c9fe 262jumped:
96c63fa7 263 if (!fib_rule_match(rule, ops, fl, flags, arg))
14c0b97d
TG		 264 continue;
265
0947c9fe
TG		 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 }
fa0b2d1d
TG		 276 } else if (rule->action == FR_ACT_NOP)
277 continue;
278 else
0947c9fe
TG		 279 err = ops->action(rule, fl, flags, arg);
280
7764a45a
ST		 281 if (!err && ops->suppress && ops->suppress(rule, arg))
282 continue;
283
14c0b97d 284 if (err != -EAGAIN) {
ebc0ffae
ED		 285 if ((arg->flags & FIB_LOOKUP_NOREF) ||
286 likely(atomic_inc_not_zero(&rule->refcnt))) {
7fa7cb71
ED		 287 arg->rule = rule;
288 goto out;
289 }
290 break;
14c0b97d
TG		 291 }
292 }
293
83886b6b 294 err = -ESRCH;
14c0b97d
TG		 295out:
296 rcu_read_unlock();
297
298 return err;
299}
14c0b97d
TG		 300EXPORT_SYMBOL_GPL(fib_rules_lookup);
301
e1701c68
TG		 302static 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;
320errout:
321 return err;
322}
323
153380ec
MB		 324static 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
35b80733
LC		 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
153380ec
MB		 364 if (!ops->compare(r, frh, tb))
365 continue;
366 return 1;
367 }
368 return 0;
369}
370
c21ef3e3
DA		 371int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
372 struct netlink_ext_ack *extack)
14c0b97d 373{
3b1e0a65 374 struct net *net = sock_net(skb->sk);
14c0b97d
TG		 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];
0947c9fe 379 int err = -EINVAL, unresolved = 0;
14c0b97d
TG		 380
381 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
382 goto errout;
383
5fd30ee7 384 ops = lookup_rules_ops(net, frh->family);
14c0b97d 385 if (ops == NULL) {
2fe195cf 386 err = -EAFNOSUPPORT;
14c0b97d
TG		 387 goto errout;
388 }
389
c21ef3e3 390 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, extack);
14c0b97d
TG		 391 if (err < 0)
392 goto errout;
393
e1701c68
TG		 394 err = validate_rulemsg(frh, tb, ops);
395 if (err < 0)
396 goto errout;
397
14c0b97d
TG		 398 rule = kzalloc(ops->rule_size, GFP_KERNEL);
399 if (rule == NULL) {
400 err = -ENOMEM;
401 goto errout;
402 }
efd7ef1c 403 rule->fr_net = net;
14c0b97d 404
f53de1e9
PS		 405 rule->pref = tb[FRA_PRIORITY] ? nla_get_u32(tb[FRA_PRIORITY])
406 : fib_default_rule_pref(ops);
14c0b97d 407
491deb24 408 if (tb[FRA_IIFNAME]) {
14c0b97d
TG		 409 struct net_device *dev;
410
491deb24
PM		 411 rule->iifindex = -1;
412 nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
413 dev = __dev_get_by_name(net, rule->iifname);
14c0b97d 414 if (dev)
491deb24 415 rule->iifindex = dev->ifindex;
14c0b97d
TG		 416 }
417
1b038a5e
PM		 418 if (tb[FRA_OIFNAME]) {
419 struct net_device *dev;
420
421 rule->oifindex = -1;
422 nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
423 dev = __dev_get_by_name(net, rule->oifname);
424 if (dev)
425 rule->oifindex = dev->ifindex;
426 }
427
b8964ed9
TG		 428 if (tb[FRA_FWMARK]) {
429 rule->mark = nla_get_u32(tb[FRA_FWMARK]);
430 if (rule->mark)
431 /* compatibility: if the mark value is non-zero all bits
432 * are compared unless a mask is explicitly specified.
433 */
434 rule->mark_mask = 0xFFFFFFFF;
435 }
436
437 if (tb[FRA_FWMASK])
438 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
439
e7030878
TG		 440 if (tb[FRA_TUN_ID])
441 rule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
442
96c63fa7
DA		 443 if (tb[FRA_L3MDEV]) {
444#ifdef CONFIG_NET_L3_MASTER_DEV
445 rule->l3mdev = nla_get_u8(tb[FRA_L3MDEV]);
446 if (rule->l3mdev != 1)
447#endif
448 goto errout_free;
449 }
450
14c0b97d
TG		 451 rule->action = frh->action;
452 rule->flags = frh->flags;
9e762a4a 453 rule->table = frh_get_table(frh, tb);
73f5698e
ST		 454 if (tb[FRA_SUPPRESS_PREFIXLEN])
455 rule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
456 else
457 rule->suppress_prefixlen = -1;
14c0b97d 458
6ef94cfa
ST		 459 if (tb[FRA_SUPPRESS_IFGROUP])
460 rule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
73f5698e
ST		 461 else
462 rule->suppress_ifgroup = -1;
6ef94cfa 463
0947c9fe
TG		 464 err = -EINVAL;
465 if (tb[FRA_GOTO]) {
466 if (rule->action != FR_ACT_GOTO)
467 goto errout_free;
468
469 rule->target = nla_get_u32(tb[FRA_GOTO]);
470 /* Backward jumps are prohibited to avoid endless loops */
471 if (rule->target <= rule->pref)
472 goto errout_free;
473
76c72d4f 474 list_for_each_entry(r, &ops->rules_list, list) {
0947c9fe 475 if (r->pref == rule->target) {
7a2b03c5 476 RCU_INIT_POINTER(rule->ctarget, r);
0947c9fe
TG		 477 break;
478 }
479 }
480
7a2b03c5 481 if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
0947c9fe
TG		 482 unresolved = 1;
483 } else if (rule->action == FR_ACT_GOTO)
484 goto errout_free;
485
96c63fa7
DA		 486 if (rule->l3mdev && rule->table)
487 goto errout_free;
488
622ec2c9
LC		 489 if (tb[FRA_UID_RANGE]) {
490 if (current_user_ns() != net->user_ns) {
491 err = -EPERM;
492 goto errout_free;
493 }
494
495 rule->uid_range = nla_get_kuid_range(tb);
496
497 if (!uid_range_set(&rule->uid_range) ||
498 !uid_lte(rule->uid_range.start, rule->uid_range.end))
499 goto errout_free;
500 } else {
501 rule->uid_range = fib_kuid_range_unset;
502 }
503
153380ec
MB		 504 if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
505 rule_exists(ops, frh, tb, rule)) {
506 err = -EEXIST;
507 goto errout_free;
508 }
509
8b3521ee 510 err = ops->configure(rule, skb, frh, tb);
14c0b97d
TG		 511 if (err < 0)
512 goto errout_free;
513
76c72d4f 514 list_for_each_entry(r, &ops->rules_list, list) {
14c0b97d
TG		 515 if (r->pref > rule->pref)
516 break;
517 last = r;
518 }
519
520 fib_rule_get(rule);
521
ebb9fed2
ED		 522 if (last)
523 list_add_rcu(&rule->list, &last->list);
524 else
525 list_add_rcu(&rule->list, &ops->rules_list);
526
0947c9fe
TG		 527 if (ops->unresolved_rules) {
528 /*
529 * There are unresolved goto rules in the list, check if
530 * any of them are pointing to this new rule.
531 */
76c72d4f 532 list_for_each_entry(r, &ops->rules_list, list) {
0947c9fe 533 if (r->action == FR_ACT_GOTO &&
561dac2d
G		 534 r->target == rule->pref &&
535 rtnl_dereference(r->ctarget) == NULL) {
0947c9fe
TG		 536 rcu_assign_pointer(r->ctarget, rule);
537 if (--ops->unresolved_rules == 0)
538 break;
539 }
540 }
541 }
542
543 if (rule->action == FR_ACT_GOTO)
544 ops->nr_goto_rules++;
545
546 if (unresolved)
547 ops->unresolved_rules++;
548
e7030878
TG		 549 if (rule->tun_id)
550 ip_tunnel_need_metadata();
551
15e47304 552 notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
73417f61 553 flush_route_cache(ops);
14c0b97d
TG		 554 rules_ops_put(ops);
555 return 0;
556
557errout_free:
558 kfree(rule);
559errout:
560 rules_ops_put(ops);
561 return err;
562}
96c63fa7 563EXPORT_SYMBOL_GPL(fib_nl_newrule);
14c0b97d 564
c21ef3e3
DA		 565int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
566 struct netlink_ext_ack *extack)
14c0b97d 567{
3b1e0a65 568 struct net *net = sock_net(skb->sk);
14c0b97d
TG		 569 struct fib_rule_hdr *frh = nlmsg_data(nlh);
570 struct fib_rules_ops *ops = NULL;
0947c9fe 571 struct fib_rule *rule, *tmp;
14c0b97d 572 struct nlattr *tb[FRA_MAX+1];
622ec2c9 573 struct fib_kuid_range range;
14c0b97d
TG		 574 int err = -EINVAL;
575
576 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
577 goto errout;
578
5fd30ee7 579 ops = lookup_rules_ops(net, frh->family);
14c0b97d 580 if (ops == NULL) {
2fe195cf 581 err = -EAFNOSUPPORT;
14c0b97d
TG		 582 goto errout;
583 }
584
c21ef3e3 585 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, extack);
14c0b97d
TG		 586 if (err < 0)
587 goto errout;
588
e1701c68
TG		 589 err = validate_rulemsg(frh, tb, ops);
590 if (err < 0)
591 goto errout;
592
622ec2c9
LC		 593 if (tb[FRA_UID_RANGE]) {
594 range = nla_get_kuid_range(tb);
595 if (!uid_range_set(&range))
596 goto errout;
597 } else {
598 range = fib_kuid_range_unset;
599 }
600
76c72d4f 601 list_for_each_entry(rule, &ops->rules_list, list) {
14c0b97d
TG		 602 if (frh->action && (frh->action != rule->action))
603 continue;
604
13eb2ab2
AH		 605 if (frh_get_table(frh, tb) &&
606 (frh_get_table(frh, tb) != rule->table))
14c0b97d
TG		 607 continue;
608
609 if (tb[FRA_PRIORITY] &&
610 (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
611 continue;
612
491deb24
PM		 613 if (tb[FRA_IIFNAME] &&
614 nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
14c0b97d
TG		 615 continue;
616
1b038a5e
PM		 617 if (tb[FRA_OIFNAME] &&
618 nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
619 continue;
620
b8964ed9
TG		 621 if (tb[FRA_FWMARK] &&
622 (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
623 continue;
624
625 if (tb[FRA_FWMASK] &&
626 (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
627 continue;
628
e7030878
TG		 629 if (tb[FRA_TUN_ID] &&
630 (rule->tun_id != nla_get_be64(tb[FRA_TUN_ID])))
631 continue;
632
96c63fa7
DA		 633 if (tb[FRA_L3MDEV] &&
634 (rule->l3mdev != nla_get_u8(tb[FRA_L3MDEV])))
635 continue;
636
622ec2c9
LC		 637 if (uid_range_set(&range) &&
638 (!uid_eq(rule->uid_range.start, range.start) ||
639 !uid_eq(rule->uid_range.end, range.end)))
640 continue;
641
14c0b97d
TG		 642 if (!ops->compare(rule, frh, tb))
643 continue;
644
645 if (rule->flags & FIB_RULE_PERMANENT) {
646 err = -EPERM;
647 goto errout;
648 }
649
0ddcf43d
AD		 650 if (ops->delete) {
651 err = ops->delete(rule);
652 if (err)
653 goto errout;
654 }
655
e7030878
TG		 656 if (rule->tun_id)
657 ip_tunnel_unneed_metadata();
658
14c0b97d 659 list_del_rcu(&rule->list);
0947c9fe 660
afaef734 661 if (rule->action == FR_ACT_GOTO) {
0947c9fe 662 ops->nr_goto_rules--;
afaef734
YZ		 663 if (rtnl_dereference(rule->ctarget) == NULL)
664 ops->unresolved_rules--;
665 }
0947c9fe
TG		 666
667 /*
668 * Check if this rule is a target to any of them. If so,
669 * disable them. As this operation is eventually very
670 * expensive, it is only performed if goto rules have
671 * actually been added.
672 */
673 if (ops->nr_goto_rules > 0) {
76c72d4f 674 list_for_each_entry(tmp, &ops->rules_list, list) {
7a2b03c5 675 if (rtnl_dereference(tmp->ctarget) == rule) {
a9b3cd7f 676 RCU_INIT_POINTER(tmp->ctarget, NULL);
0947c9fe
TG		 677 ops->unresolved_rules++;
678 }
679 }
680 }
681
9e3a5487 682 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
15e47304 683 NETLINK_CB(skb).portid);
14c0b97d 684 fib_rule_put(rule);
73417f61 685 flush_route_cache(ops);
14c0b97d
TG		 686 rules_ops_put(ops);
687 return 0;
688 }
689
690 err = -ENOENT;
691errout:
692 rules_ops_put(ops);
693 return err;
694}
96c63fa7 695EXPORT_SYMBOL_GPL(fib_nl_delrule);
14c0b97d 696
339bf98f
TG		 697static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
698 struct fib_rule *rule)
699{
700 size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
491deb24 701 + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
1b038a5e 702 + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
339bf98f
TG		 703 + nla_total_size(4) /* FRA_PRIORITY */
704 + nla_total_size(4) /* FRA_TABLE */
73f5698e 705 + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */
6ef94cfa 706 + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
339bf98f 707 + nla_total_size(4) /* FRA_FWMARK */
e7030878 708 + nla_total_size(4) /* FRA_FWMASK */
622ec2c9
LC		 709 + nla_total_size_64bit(8) /* FRA_TUN_ID */
710 + nla_total_size(sizeof(struct fib_kuid_range));
339bf98f
TG		 711
712 if (ops->nlmsg_payload)
713 payload += ops->nlmsg_payload(rule);
714
715 return payload;
716}
717
14c0b97d
TG		 718static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
719 u32 pid, u32 seq, int type, int flags,
720 struct fib_rules_ops *ops)
721{
722 struct nlmsghdr *nlh;
723 struct fib_rule_hdr *frh;
724
725 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
726 if (nlh == NULL)
26932566 727 return -EMSGSIZE;
14c0b97d
TG		 728
729 frh = nlmsg_data(nlh);
28bb1726 730 frh->family = ops->family;
14c0b97d 731 frh->table = rule->table;
0e3cea7b
DM		 732 if (nla_put_u32(skb, FRA_TABLE, rule->table))
733 goto nla_put_failure;
73f5698e 734 if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
7764a45a 735 goto nla_put_failure;
14c0b97d
TG		 736 frh->res1 = 0;
737 frh->res2 = 0;
738 frh->action = rule->action;
739 frh->flags = rule->flags;
740
7a2b03c5 741 if (rule->action == FR_ACT_GOTO &&
33d480ce 742 rcu_access_pointer(rule->ctarget) == NULL)
0947c9fe
TG		 743 frh->flags |= FIB_RULE_UNRESOLVED;
744
491deb24 745 if (rule->iifname[0]) {
0e3cea7b
DM		 746 if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
747 goto nla_put_failure;
491deb24
PM		 748 if (rule->iifindex == -1)
749 frh->flags |= FIB_RULE_IIF_DETACHED;
2b443683
TG		 750 }
751
1b038a5e 752 if (rule->oifname[0]) {
0e3cea7b
DM		 753 if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
754 goto nla_put_failure;
1b038a5e
PM		 755 if (rule->oifindex == -1)
756 frh->flags |= FIB_RULE_OIF_DETACHED;
757 }
758
0e3cea7b
DM		 759 if ((rule->pref &&
760 nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
761 (rule->mark &&
762 nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
763 ((rule->mark_mask || rule->mark) &&
764 nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
765 (rule->target &&
e7030878
TG		 766 nla_put_u32(skb, FRA_GOTO, rule->target)) ||
767 (rule->tun_id &&
96c63fa7
DA		 768 nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
769 (rule->l3mdev &&
622ec2c9
LC		 770 nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
771 (uid_range_set(&rule->uid_range) &&
772 nla_put_uid_range(skb, &rule->uid_range)))
0e3cea7b 773 goto nla_put_failure;
6ef94cfa
ST		 774
775 if (rule->suppress_ifgroup != -1) {
776 if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
777 goto nla_put_failure;
778 }
779
04af8cf6 780 if (ops->fill(rule, skb, frh) < 0)
14c0b97d
TG		 781 goto nla_put_failure;
782
053c095a
JB		 783 nlmsg_end(skb, nlh);
784 return 0;
14c0b97d
TG		 785
786nla_put_failure:
26932566
PM		 787 nlmsg_cancel(skb, nlh);
788 return -EMSGSIZE;
14c0b97d
TG		 789}
790
c454673d
TG		 791static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
792 struct fib_rules_ops *ops)
14c0b97d
TG		 793{
794 int idx = 0;
795 struct fib_rule *rule;
41fc0143 796 int err = 0;
14c0b97d 797
e67f88dd
ED		 798 rcu_read_lock();
799 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
c454673d 800 if (idx < cb->args[1])
14c0b97d
TG		 801 goto skip;
802
41fc0143
WK		 803 err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
804 cb->nlh->nlmsg_seq, RTM_NEWRULE,
805 NLM_F_MULTI, ops);
806 if (err)
14c0b97d
TG		 807 break;
808skip:
809 idx++;
810 }
2907c35f 811 rcu_read_unlock();
c454673d 812 cb->args[1] = idx;
14c0b97d
TG		 813 rules_ops_put(ops);
814
41fc0143 815 return err;
14c0b97d
TG		 816}
817
c454673d
TG		 818static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
819{
3b1e0a65 820 struct net *net = sock_net(skb->sk);
c454673d
TG		 821 struct fib_rules_ops *ops;
822 int idx = 0, family;
823
824 family = rtnl_msg_family(cb->nlh);
825 if (family != AF_UNSPEC) {
826 /* Protocol specific dump request */
5fd30ee7 827 ops = lookup_rules_ops(net, family);
c454673d
TG		 828 if (ops == NULL)
829 return -EAFNOSUPPORT;
830
41fc0143
WK		 831 dump_rules(skb, cb, ops);
832
833 return skb->len;
c454673d
TG		 834 }
835
836 rcu_read_lock();
5fd30ee7 837 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
c454673d
TG		 838 if (idx < cb->args[0] || !try_module_get(ops->owner))
839 goto skip;
840
841 if (dump_rules(skb, cb, ops) < 0)
842 break;
843
844 cb->args[1] = 0;
2fb3573d 845skip:
c454673d
TG		 846 idx++;
847 }
848 rcu_read_unlock();
849 cb->args[0] = idx;
850
851 return skb->len;
852}
14c0b97d 853
9e3a5487 854static void notify_rule_change(int event, struct fib_rule *rule,
c17084d2
TG		 855 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
856 u32 pid)
14c0b97d 857{
9e3a5487 858 struct net *net;
c17084d2
TG		 859 struct sk_buff *skb;
860 int err = -ENOBUFS;
14c0b97d 861
9e3a5487 862 net = ops->fro_net;
339bf98f 863 skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
14c0b97d 864 if (skb == NULL)
c17084d2
TG		 865 goto errout;
866
867 err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
26932566
PM		 868 if (err < 0) {
869 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
870 WARN_ON(err == -EMSGSIZE);
871 kfree_skb(skb);
872 goto errout;
873 }
9e3a5487 874
1ce85fe4
PNA		 875 rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
876 return;
c17084d2
TG		 877errout:
878 if (err < 0)
5fd30ee7 879 rtnl_set_sk_err(net, ops->nlgroup, err);
14c0b97d
TG		 880}
881
882static void attach_rules(struct list_head *rules, struct net_device *dev)
883{
884 struct fib_rule *rule;
885
886 list_for_each_entry(rule, rules, list) {
491deb24
PM		 887 if (rule->iifindex == -1 &&
888 strcmp(dev->name, rule->iifname) == 0)
889 rule->iifindex = dev->ifindex;
1b038a5e
PM		 890 if (rule->oifindex == -1 &&
891 strcmp(dev->name, rule->oifname) == 0)
892 rule->oifindex = dev->ifindex;
14c0b97d
TG		 893 }
894}
895
896static void detach_rules(struct list_head *rules, struct net_device *dev)
897{
898 struct fib_rule *rule;
899
1b038a5e 900 list_for_each_entry(rule, rules, list) {
491deb24
PM		 901 if (rule->iifindex == dev->ifindex)
902 rule->iifindex = -1;
1b038a5e
PM		 903 if (rule->oifindex == dev->ifindex)
904 rule->oifindex = -1;
905 }
14c0b97d
TG		 906}
907
908
909static int fib_rules_event(struct notifier_block *this, unsigned long event,
351638e7 910 void *ptr)
14c0b97d 911{
351638e7 912 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 913 struct net *net = dev_net(dev);
14c0b97d
TG		 914 struct fib_rules_ops *ops;
915
748e2d93 916 ASSERT_RTNL();
14c0b97d
TG		 917
918 switch (event) {
919 case NETDEV_REGISTER:
5fd30ee7 920 list_for_each_entry(ops, &net->rules_ops, list)
76c72d4f 921 attach_rules(&ops->rules_list, dev);
14c0b97d
TG		 922 break;
923
946c032e
MŻ		 924 case NETDEV_CHANGENAME:
925 list_for_each_entry(ops, &net->rules_ops, list) {
926 detach_rules(&ops->rules_list, dev);
927 attach_rules(&ops->rules_list, dev);
928 }
929 break;
930
14c0b97d 931 case NETDEV_UNREGISTER:
5fd30ee7 932 list_for_each_entry(ops, &net->rules_ops, list)
76c72d4f 933 detach_rules(&ops->rules_list, dev);
14c0b97d
TG		 934 break;
935 }
936
14c0b97d
TG		 937 return NOTIFY_DONE;
938}
939
940static struct notifier_block fib_rules_notifier = {
941 .notifier_call = fib_rules_event,
942};
943
2c8c1e72 944static int __net_init fib_rules_net_init(struct net *net)
5fd30ee7
DL		 945{
946 INIT_LIST_HEAD(&net->rules_ops);
947 spin_lock_init(&net->rules_mod_lock);
948 return 0;
949}
950
951static struct pernet_operations fib_rules_net_ops = {
952 .init = fib_rules_net_init,
953};
954
14c0b97d
TG		 955static int __init fib_rules_init(void)
956{
5fd30ee7 957 int err;
c7ac8679
GR		 958 rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL);
959 rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL);
960 rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL);
9d9e6a58 961
5d6d4809 962 err = register_pernet_subsys(&fib_rules_net_ops);
5fd30ee7
DL		 963 if (err < 0)
964 goto fail;
965
5d6d4809 966 err = register_netdevice_notifier(&fib_rules_notifier);
5fd30ee7
DL		 967 if (err < 0)
968 goto fail_unregister;
5d6d4809 969
5fd30ee7
DL		 970 return 0;
971
972fail_unregister:
5d6d4809 973 unregister_pernet_subsys(&fib_rules_net_ops);
5fd30ee7
DL		 974fail:
975 rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
976 rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
977 rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
978 return err;
14c0b97d
TG		 979}
980
981subsys_initcall(fib_rules_init);
Linux 6.x block layer and io_uring tree(s)