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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf
[linux-block.git] / net / core / fib_rules.c
CommitLineData
a10e763b 1// SPDX-License-Identifier: GPL-2.0-only
14c0b97d
TG		 2/*
3 * net/core/fib_rules.c Generic Routing Rules
4 *
14c0b97d
TG		 5 * Authors: Thomas Graf <tgraf@suug.ch>
6 */
7
14c0b97d
TG		 8#include <linux/types.h>
9#include <linux/kernel.h>
5a0e3ad6 10#include <linux/slab.h>
14c0b97d 11#include <linux/list.h>
3a9a231d 12#include <linux/module.h>
e9dc8653 13#include <net/net_namespace.h>
881d966b 14#include <net/sock.h>
14c0b97d 15#include <net/fib_rules.h>
e7030878 16#include <net/ip_tunnels.h>
b9aaec8f 17#include <linux/indirect_call_wrapper.h>
14c0b97d 18
41d707b7 19#ifdef CONFIG_IPV6_MULTIPLE_TABLES
8b66a6fd 20#ifdef CONFIG_IP_MULTIPLE_TABLES
41d707b7
BV		 21#define INDIRECT_CALL_MT(f, f2, f1, ...) \
22 INDIRECT_CALL_INET(f, f2, f1, __VA_ARGS__)
23#else
8b66a6fd
BV		 24#define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f2, __VA_ARGS__)
25#endif
80fbbb16 26#elif defined(CONFIG_IP_MULTIPLE_TABLES)
41d707b7 27#define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__)
8b66a6fd
BV		 28#else
29#define INDIRECT_CALL_MT(f, f2, f1, ...) f(__VA_ARGS__)
41d707b7
BV		 30#endif
31
622ec2c9
LC		 32static const struct fib_kuid_range fib_kuid_range_unset = {
33 KUIDT_INIT(0),
34 KUIDT_INIT(~0),
35};
36
3c71006d
IS		 37bool fib_rule_matchall(const struct fib_rule *rule)
38{
39 if (rule->iifindex || rule->oifindex || rule->mark || rule->tun_id ||
40 rule->flags)
41 return false;
42 if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
43 return false;
44 if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
45 !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
46 return false;
bfff4862
RP		 47 if (fib_rule_port_range_set(&rule->sport_range))
48 return false;
49 if (fib_rule_port_range_set(&rule->dport_range))
50 return false;
3c71006d
IS		 51 return true;
52}
53EXPORT_SYMBOL_GPL(fib_rule_matchall);
54
2994c638
DL		 55int fib_default_rule_add(struct fib_rules_ops *ops,
56 u32 pref, u32 table, u32 flags)
57{
58 struct fib_rule *r;
59
60 r = kzalloc(ops->rule_size, GFP_KERNEL);
61 if (r == NULL)
62 return -ENOMEM;
63
717d1e99 64 refcount_set(&r->refcnt, 1);
2994c638
DL		 65 r->action = FR_ACT_TO_TBL;
66 r->pref = pref;
67 r->table = table;
68 r->flags = flags;
cac56209 69 r->proto = RTPROT_KERNEL;
efd7ef1c 70 r->fr_net = ops->fro_net;
622ec2c9 71 r->uid_range = fib_kuid_range_unset;
2994c638 72
73f5698e
ST		 73 r->suppress_prefixlen = -1;
74 r->suppress_ifgroup = -1;
75
2994c638
DL		 76 /* The lock is not required here, the list in unreacheable
77 * at the moment this function is called */
78 list_add_tail(&r->list, &ops->rules_list);
79 return 0;
80}
81EXPORT_SYMBOL(fib_default_rule_add);
82
f53de1e9 83static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
d8a566be
PM		 84{
85 struct list_head *pos;
86 struct fib_rule *rule;
87
88 if (!list_empty(&ops->rules_list)) {
89 pos = ops->rules_list.next;
90 if (pos->next != &ops->rules_list) {
91 rule = list_entry(pos->next, struct fib_rule, list);
92 if (rule->pref)
93 return rule->pref - 1;
94 }
95 }
96
97 return 0;
98}
d8a566be 99
9e3a5487 100static void notify_rule_change(int event, struct fib_rule *rule,
c17084d2
TG		 101 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
102 u32 pid);
14c0b97d 103
5fd30ee7 104static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
14c0b97d
TG		 105{
106 struct fib_rules_ops *ops;
107
108 rcu_read_lock();
5fd30ee7 109 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
14c0b97d
TG		 110 if (ops->family == family) {
111 if (!try_module_get(ops->owner))
112 ops = NULL;
113 rcu_read_unlock();
114 return ops;
115 }
116 }
117 rcu_read_unlock();
118
119 return NULL;
120}
121
122static void rules_ops_put(struct fib_rules_ops *ops)
123{
124 if (ops)
125 module_put(ops->owner);
126}
127
73417f61
TG		 128static void flush_route_cache(struct fib_rules_ops *ops)
129{
130 if (ops->flush_cache)
ae299fc0 131 ops->flush_cache(ops);
73417f61
TG		 132}
133
e9c5158a 134static int __fib_rules_register(struct fib_rules_ops *ops)
14c0b97d
TG		 135{
136 int err = -EEXIST;
137 struct fib_rules_ops *o;
9e3a5487
DL		 138 struct net *net;
139
140 net = ops->fro_net;
14c0b97d
TG		 141
142 if (ops->rule_size < sizeof(struct fib_rule))
143 return -EINVAL;
144
145 if (ops->match == NULL || ops->configure == NULL ||
146 ops->compare == NULL || ops->fill == NULL ||
147 ops->action == NULL)
148 return -EINVAL;
149
5fd30ee7
DL		 150 spin_lock(&net->rules_mod_lock);
151 list_for_each_entry(o, &net->rules_ops, list)
14c0b97d
TG		 152 if (ops->family == o->family)
153 goto errout;
154
5fd30ee7 155 list_add_tail_rcu(&ops->list, &net->rules_ops);
14c0b97d
TG		 156 err = 0;
157errout:
5fd30ee7 158 spin_unlock(&net->rules_mod_lock);
14c0b97d
TG		 159
160 return err;
161}
162
e9c5158a 163struct fib_rules_ops *
3d0c9c4e 164fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
e9c5158a
EB		 165{
166 struct fib_rules_ops *ops;
167 int err;
168
2fb3573d 169 ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
e9c5158a
EB		 170 if (ops == NULL)
171 return ERR_PTR(-ENOMEM);
172
173 INIT_LIST_HEAD(&ops->rules_list);
174 ops->fro_net = net;
175
176 err = __fib_rules_register(ops);
177 if (err) {
178 kfree(ops);
179 ops = ERR_PTR(err);
180 }
181
182 return ops;
183}
14c0b97d
TG		 184EXPORT_SYMBOL_GPL(fib_rules_register);
185
1df9916e 186static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
14c0b97d
TG		 187{
188 struct fib_rule *rule, *tmp;
189
76c72d4f 190 list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
14c0b97d 191 list_del_rcu(&rule->list);
7a9bc9b8
DM		 192 if (ops->delete)
193 ops->delete(rule);
14c0b97d
TG		 194 fib_rule_put(rule);
195 }
196}
197
9e3a5487 198void fib_rules_unregister(struct fib_rules_ops *ops)
14c0b97d 199{
9e3a5487 200 struct net *net = ops->fro_net;
14c0b97d 201
5fd30ee7 202 spin_lock(&net->rules_mod_lock);
72132c1b 203 list_del_rcu(&ops->list);
5fd30ee7 204 spin_unlock(&net->rules_mod_lock);
14c0b97d 205
419df12f 206 fib_rules_cleanup_ops(ops);
efd7ef1c 207 kfree_rcu(ops, rcu);
14c0b97d 208}
14c0b97d
TG		 209EXPORT_SYMBOL_GPL(fib_rules_unregister);
210
622ec2c9
LC		 211static int uid_range_set(struct fib_kuid_range *range)
212{
213 return uid_valid(range->start) && uid_valid(range->end);
214}
215
216static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
217{
218 struct fib_rule_uid_range *in;
219 struct fib_kuid_range out;
220
221 in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);
222
223 out.start = make_kuid(current_user_ns(), in->start);
224 out.end = make_kuid(current_user_ns(), in->end);
225
226 return out;
227}
228
229static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
230{
231 struct fib_rule_uid_range out = {
232 from_kuid_munged(current_user_ns(), range->start),
233 from_kuid_munged(current_user_ns(), range->end)
234 };
235
236 return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
237}
238
bfff4862
RP		 239static int nla_get_port_range(struct nlattr *pattr,
240 struct fib_rule_port_range *port_range)
241{
242 const struct fib_rule_port_range *pr = nla_data(pattr);
243
244 if (!fib_rule_port_range_valid(pr))
245 return -EINVAL;
246
247 port_range->start = pr->start;
248 port_range->end = pr->end;
249
250 return 0;
251}
252
253static int nla_put_port_range(struct sk_buff *skb, int attrtype,
254 struct fib_rule_port_range *range)
255{
256 return nla_put(skb, attrtype, sizeof(*range), range);
257}
258
3dfbcc41 259static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
96c63fa7
DA		 260 struct flowi *fl, int flags,
261 struct fib_lookup_arg *arg)
3dfbcc41
TG		 262{
263 int ret = 0;
264
1d28f42c 265 if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
3dfbcc41
TG		 266 goto out;
267
1d28f42c 268 if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
1b038a5e
PM		 269 goto out;
270
1d28f42c 271 if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
3dfbcc41
TG		 272 goto out;
273
e7030878
TG		 274 if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
275 goto out;
276
96c63fa7
DA		 277 if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
278 goto out;
279
622ec2c9
LC		 280 if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
281 uid_gt(fl->flowi_uid, rule->uid_range.end))
282 goto out;
283
41d707b7
BV		 284 ret = INDIRECT_CALL_MT(ops->match,
285 fib6_rule_match,
286 fib4_rule_match,
287 rule, fl, flags);
3dfbcc41
TG		 288out:
289 return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
290}
291
14c0b97d
TG		 292int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
293 int flags, struct fib_lookup_arg *arg)
294{
295 struct fib_rule *rule;
296 int err;
297
298 rcu_read_lock();
299
76c72d4f 300 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
0947c9fe 301jumped:
96c63fa7 302 if (!fib_rule_match(rule, ops, fl, flags, arg))
14c0b97d
TG		 303 continue;
304
0947c9fe
TG		 305 if (rule->action == FR_ACT_GOTO) {
306 struct fib_rule *target;
307
308 target = rcu_dereference(rule->ctarget);
309 if (target == NULL) {
310 continue;
311 } else {
312 rule = target;
313 goto jumped;
314 }
fa0b2d1d
TG		 315 } else if (rule->action == FR_ACT_NOP)
316 continue;
317 else
41d707b7
BV		 318 err = INDIRECT_CALL_MT(ops->action,
319 fib6_rule_action,
320 fib4_rule_action,
321 rule, fl, flags, arg);
322
323 if (!err && ops->suppress && INDIRECT_CALL_MT(ops->suppress,
324 fib6_rule_suppress,
325 fib4_rule_suppress,
326 rule, arg))
7764a45a
ST		 327 continue;
328
14c0b97d 329 if (err != -EAGAIN) {
ebc0ffae 330 if ((arg->flags & FIB_LOOKUP_NOREF) ||
717d1e99 331 likely(refcount_inc_not_zero(&rule->refcnt))) {
7fa7cb71
ED		 332 arg->rule = rule;
333 goto out;
334 }
335 break;
14c0b97d
TG		 336 }
337 }
338
83886b6b 339 err = -ESRCH;
14c0b97d
TG		 340out:
341 rcu_read_unlock();
342
343 return err;
344}
14c0b97d
TG		 345EXPORT_SYMBOL_GPL(fib_rules_lookup);
346
7c550daf 347static int call_fib_rule_notifier(struct notifier_block *nb,
1b2a4440 348 enum fib_event_type event_type,
b7a59557
JP		 349 struct fib_rule *rule, int family,
350 struct netlink_ext_ack *extack)
1b2a4440
IS		 351{
352 struct fib_rule_notifier_info info = {
353 .info.family = family,
b7a59557 354 .info.extack = extack,
1b2a4440
IS		 355 .rule = rule,
356 };
357
7c550daf 358 return call_fib_notifier(nb, event_type, &info.info);
1b2a4440
IS		 359}
360
361static int call_fib_rule_notifiers(struct net *net,
362 enum fib_event_type event_type,
363 struct fib_rule *rule,
6c31e5a9
DA		 364 struct fib_rules_ops *ops,
365 struct netlink_ext_ack *extack)
1b2a4440
IS		 366{
367 struct fib_rule_notifier_info info = {
368 .info.family = ops->family,
6c31e5a9 369 .info.extack = extack,
1b2a4440
IS		 370 .rule = rule,
371 };
372
373 ops->fib_rules_seq++;
374 return call_fib_notifiers(net, event_type, &info.info);
375}
376
377/* Called with rcu_read_lock() */
b7a59557
JP		 378int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
379 struct netlink_ext_ack *extack)
1b2a4440
IS		 380{
381 struct fib_rules_ops *ops;
382 struct fib_rule *rule;
55c894f7 383 int err = 0;
1b2a4440
IS		 384
385 ops = lookup_rules_ops(net, family);
386 if (!ops)
387 return -EAFNOSUPPORT;
55c894f7
JP		 388 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
389 err = call_fib_rule_notifier(nb, FIB_EVENT_RULE_ADD,
b7a59557 390 rule, family, extack);
55c894f7
JP		 391 if (err)
392 break;
393 }
1b2a4440
IS		 394 rules_ops_put(ops);
395
55c894f7 396 return err;
1b2a4440
IS		 397}
398EXPORT_SYMBOL_GPL(fib_rules_dump);
399
400unsigned int fib_rules_seq_read(struct net *net, int family)
401{
402 unsigned int fib_rules_seq;
403 struct fib_rules_ops *ops;
404
405 ASSERT_RTNL();
406
407 ops = lookup_rules_ops(net, family);
408 if (!ops)
409 return 0;
410 fib_rules_seq = ops->fib_rules_seq;
411 rules_ops_put(ops);
412
413 return fib_rules_seq;
414}
415EXPORT_SYMBOL_GPL(fib_rules_seq_read);
416
f9d4b0c1
RP		 417static struct fib_rule *rule_find(struct fib_rules_ops *ops,
418 struct fib_rule_hdr *frh,
419 struct nlattr **tb,
420 struct fib_rule *rule,
421 bool user_priority)
153380ec
MB		 422{
423 struct fib_rule *r;
424
425 list_for_each_entry(r, &ops->rules_list, list) {
f9d4b0c1 426 if (rule->action && r->action != rule->action)
153380ec
MB		 427 continue;
428
f9d4b0c1 429 if (rule->table && r->table != rule->table)
153380ec
MB		 430 continue;
431
f9d4b0c1 432 if (user_priority && r->pref != rule->pref)
153380ec
MB		 433 continue;
434
f9d4b0c1
RP		 435 if (rule->iifname[0] &&
436 memcmp(r->iifname, rule->iifname, IFNAMSIZ))
153380ec
MB		 437 continue;
438
f9d4b0c1
RP		 439 if (rule->oifname[0] &&
440 memcmp(r->oifname, rule->oifname, IFNAMSIZ))
153380ec
MB		 441 continue;
442
f9d4b0c1 443 if (rule->mark && r->mark != rule->mark)
153380ec
MB		 444 continue;
445
7c8f4e6d
JD		 446 if (rule->suppress_ifgroup != -1 &&
447 r->suppress_ifgroup != rule->suppress_ifgroup)
448 continue;
449
450 if (rule->suppress_prefixlen != -1 &&
451 r->suppress_prefixlen != rule->suppress_prefixlen)
452 continue;
453
f9d4b0c1 454 if (rule->mark_mask && r->mark_mask != rule->mark_mask)
153380ec
MB		 455 continue;
456
f9d4b0c1 457 if (rule->tun_id && r->tun_id != rule->tun_id)
153380ec
MB		 458 continue;
459
460 if (r->fr_net != rule->fr_net)
461 continue;
462
f9d4b0c1 463 if (rule->l3mdev && r->l3mdev != rule->l3mdev)
153380ec
MB		 464 continue;
465
f9d4b0c1
RP		 466 if (uid_range_set(&rule->uid_range) &&
467 (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
468 !uid_eq(r->uid_range.end, rule->uid_range.end)))
35b80733
LC		 469 continue;
470
f9d4b0c1 471 if (rule->ip_proto && r->ip_proto != rule->ip_proto)
bfff4862
RP		 472 continue;
473
35e8c7ba
RP		 474 if (rule->proto && r->proto != rule->proto)
475 continue;
476
f9d4b0c1
RP		 477 if (fib_rule_port_range_set(&rule->sport_range) &&
478 !fib_rule_port_range_compare(&r->sport_range,
bfff4862
RP		 479 &rule->sport_range))
480 continue;
481
f9d4b0c1
RP		 482 if (fib_rule_port_range_set(&rule->dport_range) &&
483 !fib_rule_port_range_compare(&r->dport_range,
bfff4862
RP		 484 &rule->dport_range))
485 continue;
486
153380ec
MB		 487 if (!ops->compare(r, frh, tb))
488 continue;
f9d4b0c1 489 return r;
153380ec 490 }
f9d4b0c1
RP		 491
492 return NULL;
153380ec
MB		 493}
494
c77bbc64
DA		 495#ifdef CONFIG_NET_L3_MASTER_DEV
496static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
497 struct netlink_ext_ack *extack)
498{
499 nlrule->l3mdev = nla_get_u8(nla);
500 if (nlrule->l3mdev != 1) {
501 NL_SET_ERR_MSG(extack, "Invalid l3mdev attribute");
502 return -1;
503 }
504
505 return 0;
506}
507#else
508static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
509 struct netlink_ext_ack *extack)
510{
511 NL_SET_ERR_MSG(extack, "l3mdev support is not enabled in kernel");
512 return -1;
513}
514#endif
515
f9d4b0c1
RP		 516static int fib_nl2rule(struct sk_buff *skb, struct nlmsghdr *nlh,
517 struct netlink_ext_ack *extack,
518 struct fib_rules_ops *ops,
519 struct nlattr *tb[],
520 struct fib_rule **rule,
521 bool *user_priority)
14c0b97d 522{
3b1e0a65 523 struct net *net = sock_net(skb->sk);
14c0b97d 524 struct fib_rule_hdr *frh = nlmsg_data(nlh);
f9d4b0c1
RP		 525 struct fib_rule *nlrule = NULL;
526 int err = -EINVAL;
14c0b97d 527
f9d4b0c1
RP		 528 if (frh->src_len)
529 if (!tb[FRA_SRC] ||
530 frh->src_len > (ops->addr_size * 8) ||
b16fb418
RP		 531 nla_len(tb[FRA_SRC]) != ops->addr_size) {
532 NL_SET_ERR_MSG(extack, "Invalid source address");
f9d4b0c1 533 goto errout;
b16fb418 534 }
14c0b97d 535
f9d4b0c1
RP		 536 if (frh->dst_len)
537 if (!tb[FRA_DST] ||
538 frh->dst_len > (ops->addr_size * 8) ||
b16fb418
RP		 539 nla_len(tb[FRA_DST]) != ops->addr_size) {
540 NL_SET_ERR_MSG(extack, "Invalid dst address");
f9d4b0c1 541 goto errout;
b16fb418 542 }
e1701c68 543
f9d4b0c1
RP		 544 nlrule = kzalloc(ops->rule_size, GFP_KERNEL);
545 if (!nlrule) {
14c0b97d
TG		 546 err = -ENOMEM;
547 goto errout;
548 }
f9d4b0c1
RP		 549 refcount_set(&nlrule->refcnt, 1);
550 nlrule->fr_net = net;
14c0b97d 551
f9d4b0c1
RP		 552 if (tb[FRA_PRIORITY]) {
553 nlrule->pref = nla_get_u32(tb[FRA_PRIORITY]);
554 *user_priority = true;
555 } else {
556 nlrule->pref = fib_default_rule_pref(ops);
557 }
14c0b97d 558
f9d4b0c1 559 nlrule->proto = tb[FRA_PROTOCOL] ?
1b71af60
DS		 560 nla_get_u8(tb[FRA_PROTOCOL]) : RTPROT_UNSPEC;
561
491deb24 562 if (tb[FRA_IIFNAME]) {
14c0b97d
TG		 563 struct net_device *dev;
564
f9d4b0c1
RP		 565 nlrule->iifindex = -1;
566 nla_strlcpy(nlrule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
567 dev = __dev_get_by_name(net, nlrule->iifname);
14c0b97d 568 if (dev)
f9d4b0c1 569 nlrule->iifindex = dev->ifindex;
14c0b97d
TG		 570 }
571
1b038a5e
PM		 572 if (tb[FRA_OIFNAME]) {
573 struct net_device *dev;
574
f9d4b0c1
RP		 575 nlrule->oifindex = -1;
576 nla_strlcpy(nlrule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
577 dev = __dev_get_by_name(net, nlrule->oifname);
1b038a5e 578 if (dev)
f9d4b0c1 579 nlrule->oifindex = dev->ifindex;
1b038a5e
PM		 580 }
581
b8964ed9 582 if (tb[FRA_FWMARK]) {
f9d4b0c1
RP		 583 nlrule->mark = nla_get_u32(tb[FRA_FWMARK]);
584 if (nlrule->mark)
b8964ed9
TG		 585 /* compatibility: if the mark value is non-zero all bits
586 * are compared unless a mask is explicitly specified.
587 */
f9d4b0c1 588 nlrule->mark_mask = 0xFFFFFFFF;
b8964ed9
TG		 589 }
590
591 if (tb[FRA_FWMASK])
f9d4b0c1 592 nlrule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
b8964ed9 593
e7030878 594 if (tb[FRA_TUN_ID])
f9d4b0c1 595 nlrule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
e7030878 596
adeb45cb 597 err = -EINVAL;
c77bbc64
DA		 598 if (tb[FRA_L3MDEV] &&
599 fib_nl2rule_l3mdev(tb[FRA_L3MDEV], nlrule, extack) < 0)
600 goto errout_free;
96c63fa7 601
f9d4b0c1
RP		 602 nlrule->action = frh->action;
603 nlrule->flags = frh->flags;
604 nlrule->table = frh_get_table(frh, tb);
73f5698e 605 if (tb[FRA_SUPPRESS_PREFIXLEN])
f9d4b0c1 606 nlrule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
73f5698e 607 else
f9d4b0c1 608 nlrule->suppress_prefixlen = -1;
14c0b97d 609
6ef94cfa 610 if (tb[FRA_SUPPRESS_IFGROUP])
f9d4b0c1 611 nlrule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
73f5698e 612 else
f9d4b0c1 613 nlrule->suppress_ifgroup = -1;
6ef94cfa 614
0947c9fe 615 if (tb[FRA_GOTO]) {
b16fb418
RP		 616 if (nlrule->action != FR_ACT_GOTO) {
617 NL_SET_ERR_MSG(extack, "Unexpected goto");
0947c9fe 618 goto errout_free;
b16fb418 619 }
0947c9fe 620
f9d4b0c1 621 nlrule->target = nla_get_u32(tb[FRA_GOTO]);
0947c9fe 622 /* Backward jumps are prohibited to avoid endless loops */
b16fb418
RP		 623 if (nlrule->target <= nlrule->pref) {
624 NL_SET_ERR_MSG(extack, "Backward goto not supported");
0947c9fe 625 goto errout_free;
b16fb418 626 }
f9d4b0c1 627 } else if (nlrule->action == FR_ACT_GOTO) {
b16fb418 628 NL_SET_ERR_MSG(extack, "Missing goto target for action goto");
0947c9fe 629 goto errout_free;
f9d4b0c1 630 }
0947c9fe 631
b16fb418
RP		 632 if (nlrule->l3mdev && nlrule->table) {
633 NL_SET_ERR_MSG(extack, "l3mdev and table are mutually exclusive");
96c63fa7 634 goto errout_free;
b16fb418 635 }
96c63fa7 636
622ec2c9
LC		 637 if (tb[FRA_UID_RANGE]) {
638 if (current_user_ns() != net->user_ns) {
639 err = -EPERM;
b16fb418 640 NL_SET_ERR_MSG(extack, "No permission to set uid");
622ec2c9
LC		 641 goto errout_free;
642 }
643
f9d4b0c1 644 nlrule->uid_range = nla_get_kuid_range(tb);
622ec2c9 645
f9d4b0c1 646 if (!uid_range_set(&nlrule->uid_range) ||
b16fb418
RP		 647 !uid_lte(nlrule->uid_range.start, nlrule->uid_range.end)) {
648 NL_SET_ERR_MSG(extack, "Invalid uid range");
622ec2c9 649 goto errout_free;
b16fb418 650 }
622ec2c9 651 } else {
f9d4b0c1 652 nlrule->uid_range = fib_kuid_range_unset;
622ec2c9
LC		 653 }
654
bfff4862 655 if (tb[FRA_IP_PROTO])
f9d4b0c1 656 nlrule->ip_proto = nla_get_u8(tb[FRA_IP_PROTO]);
bfff4862
RP		 657
658 if (tb[FRA_SPORT_RANGE]) {
659 err = nla_get_port_range(tb[FRA_SPORT_RANGE],
f9d4b0c1 660 &nlrule->sport_range);
b16fb418
RP		 661 if (err) {
662 NL_SET_ERR_MSG(extack, "Invalid sport range");
bfff4862 663 goto errout_free;
b16fb418 664 }
bfff4862
RP		 665 }
666
667 if (tb[FRA_DPORT_RANGE]) {
668 err = nla_get_port_range(tb[FRA_DPORT_RANGE],
f9d4b0c1 669 &nlrule->dport_range);
b16fb418
RP		 670 if (err) {
671 NL_SET_ERR_MSG(extack, "Invalid dport range");
bfff4862 672 goto errout_free;
b16fb418 673 }
bfff4862
RP		 674 }
675
f9d4b0c1
RP		 676 *rule = nlrule;
677
678 return 0;
679
680errout_free:
681 kfree(nlrule);
682errout:
683 return err;
684}
685
35e8c7ba
RP		 686static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
687 struct nlattr **tb, struct fib_rule *rule)
688{
689 struct fib_rule *r;
690
691 list_for_each_entry(r, &ops->rules_list, list) {
692 if (r->action != rule->action)
693 continue;
694
695 if (r->table != rule->table)
696 continue;
697
698 if (r->pref != rule->pref)
699 continue;
700
701 if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
702 continue;
703
704 if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
705 continue;
706
707 if (r->mark != rule->mark)
708 continue;
709
710 if (r->suppress_ifgroup != rule->suppress_ifgroup)
711 continue;
712
713 if (r->suppress_prefixlen != rule->suppress_prefixlen)
714 continue;
715
716 if (r->mark_mask != rule->mark_mask)
717 continue;
718
719 if (r->tun_id != rule->tun_id)
720 continue;
721
722 if (r->fr_net != rule->fr_net)
723 continue;
724
725 if (r->l3mdev != rule->l3mdev)
726 continue;
727
728 if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
729 !uid_eq(r->uid_range.end, rule->uid_range.end))
730 continue;
731
732 if (r->ip_proto != rule->ip_proto)
733 continue;
734
735 if (r->proto != rule->proto)
736 continue;
737
738 if (!fib_rule_port_range_compare(&r->sport_range,
739 &rule->sport_range))
740 continue;
741
742 if (!fib_rule_port_range_compare(&r->dport_range,
743 &rule->dport_range))
744 continue;
745
746 if (!ops->compare(r, frh, tb))
747 continue;
748 return 1;
749 }
750 return 0;
751}
752
f9d4b0c1
RP		 753int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
754 struct netlink_ext_ack *extack)
755{
756 struct net *net = sock_net(skb->sk);
757 struct fib_rule_hdr *frh = nlmsg_data(nlh);
758 struct fib_rules_ops *ops = NULL;
759 struct fib_rule *rule = NULL, *r, *last = NULL;
760 struct nlattr *tb[FRA_MAX + 1];
761 int err = -EINVAL, unresolved = 0;
762 bool user_priority = false;
763
b16fb418
RP		 764 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
765 NL_SET_ERR_MSG(extack, "Invalid msg length");
f9d4b0c1 766 goto errout;
b16fb418 767 }
f9d4b0c1
RP		 768
769 ops = lookup_rules_ops(net, frh->family);
770 if (!ops) {
771 err = -EAFNOSUPPORT;
b16fb418 772 NL_SET_ERR_MSG(extack, "Rule family not supported");
f9d4b0c1
RP		 773 goto errout;
774 }
775
8cb08174
JB		 776 err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
777 ops->policy, extack);
b16fb418
RP		 778 if (err < 0) {
779 NL_SET_ERR_MSG(extack, "Error parsing msg");
f9d4b0c1 780 goto errout;
b16fb418 781 }
f9d4b0c1
RP		 782
783 err = fib_nl2rule(skb, nlh, extack, ops, tb, &rule, &user_priority);
784 if (err)
785 goto errout;
786
4970b42d
HL		 787 if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
788 rule_exists(ops, frh, tb, rule)) {
789 err = -EEXIST;
153380ec
MB		 790 goto errout_free;
791 }
792
b16fb418 793 err = ops->configure(rule, skb, frh, tb, extack);
14c0b97d
TG		 794 if (err < 0)
795 goto errout_free;
796
9776d325
DA		 797 err = call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule, ops,
798 extack);
799 if (err < 0)
800 goto errout_free;
801
f9d4b0c1
RP		 802 list_for_each_entry(r, &ops->rules_list, list) {
803 if (r->pref == rule->target) {
804 RCU_INIT_POINTER(rule->ctarget, r);
805 break;
806 }
807 }
808
809 if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
810 unresolved = 1;
811
76c72d4f 812 list_for_each_entry(r, &ops->rules_list, list) {
14c0b97d
TG		 813 if (r->pref > rule->pref)
814 break;
815 last = r;
816 }
817
ebb9fed2
ED		 818 if (last)
819 list_add_rcu(&rule->list, &last->list);
820 else
821 list_add_rcu(&rule->list, &ops->rules_list);
822
0947c9fe
TG		 823 if (ops->unresolved_rules) {
824 /*
825 * There are unresolved goto rules in the list, check if
826 * any of them are pointing to this new rule.
827 */
76c72d4f 828 list_for_each_entry(r, &ops->rules_list, list) {
0947c9fe 829 if (r->action == FR_ACT_GOTO &&
561dac2d
G		 830 r->target == rule->pref &&
831 rtnl_dereference(r->ctarget) == NULL) {
0947c9fe
TG		 832 rcu_assign_pointer(r->ctarget, rule);
833 if (--ops->unresolved_rules == 0)
834 break;
835 }
836 }
837 }
838
839 if (rule->action == FR_ACT_GOTO)
840 ops->nr_goto_rules++;
841
842 if (unresolved)
843 ops->unresolved_rules++;
844
e7030878
TG		 845 if (rule->tun_id)
846 ip_tunnel_need_metadata();
847
15e47304 848 notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
73417f61 849 flush_route_cache(ops);
14c0b97d
TG		 850 rules_ops_put(ops);
851 return 0;
852
853errout_free:
854 kfree(rule);
855errout:
856 rules_ops_put(ops);
857 return err;
858}
96c63fa7 859EXPORT_SYMBOL_GPL(fib_nl_newrule);
14c0b97d 860
c21ef3e3
DA		 861int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
862 struct netlink_ext_ack *extack)
14c0b97d 863{
3b1e0a65 864 struct net *net = sock_net(skb->sk);
14c0b97d
TG		 865 struct fib_rule_hdr *frh = nlmsg_data(nlh);
866 struct fib_rules_ops *ops = NULL;
f9d4b0c1 867 struct fib_rule *rule = NULL, *r, *nlrule = NULL;
14c0b97d
TG		 868 struct nlattr *tb[FRA_MAX+1];
869 int err = -EINVAL;
f9d4b0c1 870 bool user_priority = false;
14c0b97d 871
b16fb418
RP		 872 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
873 NL_SET_ERR_MSG(extack, "Invalid msg length");
14c0b97d 874 goto errout;
b16fb418 875 }
14c0b97d 876
5fd30ee7 877 ops = lookup_rules_ops(net, frh->family);
14c0b97d 878 if (ops == NULL) {
2fe195cf 879 err = -EAFNOSUPPORT;
b16fb418 880 NL_SET_ERR_MSG(extack, "Rule family not supported");
14c0b97d
TG		 881 goto errout;
882 }
883
8cb08174
JB		 884 err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
885 ops->policy, extack);
b16fb418
RP		 886 if (err < 0) {
887 NL_SET_ERR_MSG(extack, "Error parsing msg");
14c0b97d 888 goto errout;
b16fb418 889 }
14c0b97d 890
f9d4b0c1
RP		 891 err = fib_nl2rule(skb, nlh, extack, ops, tb, &nlrule, &user_priority);
892 if (err)
e1701c68
TG		 893 goto errout;
894
f9d4b0c1
RP		 895 rule = rule_find(ops, frh, tb, nlrule, user_priority);
896 if (!rule) {
897 err = -ENOENT;
898 goto errout;
622ec2c9
LC		 899 }
900
f9d4b0c1
RP		 901 if (rule->flags & FIB_RULE_PERMANENT) {
902 err = -EPERM;
903 goto errout;
bfff4862
RP		 904 }
905
f9d4b0c1
RP		 906 if (ops->delete) {
907 err = ops->delete(rule);
bfff4862
RP		 908 if (err)
909 goto errout;
910 }
911
f9d4b0c1
RP		 912 if (rule->tun_id)
913 ip_tunnel_unneed_metadata();
0ddcf43d 914
f9d4b0c1 915 list_del_rcu(&rule->list);
e7030878 916
f9d4b0c1
RP		 917 if (rule->action == FR_ACT_GOTO) {
918 ops->nr_goto_rules--;
919 if (rtnl_dereference(rule->ctarget) == NULL)
920 ops->unresolved_rules--;
921 }
0947c9fe 922
f9d4b0c1
RP		 923 /*
924 * Check if this rule is a target to any of them. If so,
925 * adjust to the next one with the same preference or
926 * disable them. As this operation is eventually very
927 * expensive, it is only performed if goto rules, except
928 * current if it is goto rule, have actually been added.
929 */
930 if (ops->nr_goto_rules > 0) {
931 struct fib_rule *n;
932
933 n = list_next_entry(rule, list);
934 if (&n->list == &ops->rules_list || n->pref != rule->pref)
935 n = NULL;
936 list_for_each_entry(r, &ops->rules_list, list) {
937 if (rtnl_dereference(r->ctarget) != rule)
938 continue;
939 rcu_assign_pointer(r->ctarget, n);
940 if (!n)
941 ops->unresolved_rules++;
0947c9fe 942 }
14c0b97d
TG		 943 }
944
f9d4b0c1
RP		 945 call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule, ops,
946 NULL);
947 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
948 NETLINK_CB(skb).portid);
949 fib_rule_put(rule);
950 flush_route_cache(ops);
951 rules_ops_put(ops);
952 kfree(nlrule);
953 return 0;
954
14c0b97d 955errout:
778c4d5c 956 kfree(nlrule);
14c0b97d
TG		 957 rules_ops_put(ops);
958 return err;
959}
96c63fa7 960EXPORT_SYMBOL_GPL(fib_nl_delrule);
14c0b97d 961
339bf98f
TG		 962static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
963 struct fib_rule *rule)
964{
965 size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
491deb24 966 + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
1b038a5e 967 + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
339bf98f
TG		 968 + nla_total_size(4) /* FRA_PRIORITY */
969 + nla_total_size(4) /* FRA_TABLE */
73f5698e 970 + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */
6ef94cfa 971 + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
339bf98f 972 + nla_total_size(4) /* FRA_FWMARK */
e7030878 973 + nla_total_size(4) /* FRA_FWMASK */
622ec2c9 974 + nla_total_size_64bit(8) /* FRA_TUN_ID */
1b71af60 975 + nla_total_size(sizeof(struct fib_kuid_range))
bfff4862
RP		 976 + nla_total_size(1) /* FRA_PROTOCOL */
977 + nla_total_size(1) /* FRA_IP_PROTO */
978 + nla_total_size(sizeof(struct fib_rule_port_range)) /* FRA_SPORT_RANGE */
979 + nla_total_size(sizeof(struct fib_rule_port_range)); /* FRA_DPORT_RANGE */
339bf98f
TG		 980
981 if (ops->nlmsg_payload)
982 payload += ops->nlmsg_payload(rule);
983
984 return payload;
985}
986
14c0b97d
TG		 987static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
988 u32 pid, u32 seq, int type, int flags,
989 struct fib_rules_ops *ops)
990{
991 struct nlmsghdr *nlh;
992 struct fib_rule_hdr *frh;
993
994 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
995 if (nlh == NULL)
26932566 996 return -EMSGSIZE;
14c0b97d
TG		 997
998 frh = nlmsg_data(nlh);
28bb1726 999 frh->family = ops->family;
540e585a 1000 frh->table = rule->table < 256 ? rule->table : RT_TABLE_COMPAT;
0e3cea7b
DM		 1001 if (nla_put_u32(skb, FRA_TABLE, rule->table))
1002 goto nla_put_failure;
73f5698e 1003 if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
7764a45a 1004 goto nla_put_failure;
14c0b97d 1005 frh->res1 = 0;
1b71af60 1006 frh->res2 = 0;
14c0b97d
TG		 1007 frh->action = rule->action;
1008 frh->flags = rule->flags;
1b71af60
DS		 1009
1010 if (nla_put_u8(skb, FRA_PROTOCOL, rule->proto))
1011 goto nla_put_failure;
14c0b97d 1012
7a2b03c5 1013 if (rule->action == FR_ACT_GOTO &&
33d480ce 1014 rcu_access_pointer(rule->ctarget) == NULL)
0947c9fe
TG		 1015 frh->flags |= FIB_RULE_UNRESOLVED;
1016
491deb24 1017 if (rule->iifname[0]) {
0e3cea7b
DM		 1018 if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
1019 goto nla_put_failure;
491deb24
PM		 1020 if (rule->iifindex == -1)
1021 frh->flags |= FIB_RULE_IIF_DETACHED;
2b443683
TG		 1022 }
1023
1b038a5e 1024 if (rule->oifname[0]) {
0e3cea7b
DM		 1025 if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
1026 goto nla_put_failure;
1b038a5e
PM		 1027 if (rule->oifindex == -1)
1028 frh->flags |= FIB_RULE_OIF_DETACHED;
1029 }
1030
0e3cea7b
DM		 1031 if ((rule->pref &&
1032 nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
1033 (rule->mark &&
1034 nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
1035 ((rule->mark_mask || rule->mark) &&
1036 nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
1037 (rule->target &&
e7030878
TG		 1038 nla_put_u32(skb, FRA_GOTO, rule->target)) ||
1039 (rule->tun_id &&
96c63fa7
DA		 1040 nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
1041 (rule->l3mdev &&
622ec2c9
LC		 1042 nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
1043 (uid_range_set(&rule->uid_range) &&
bfff4862
RP		 1044 nla_put_uid_range(skb, &rule->uid_range)) ||
1045 (fib_rule_port_range_set(&rule->sport_range) &&
1046 nla_put_port_range(skb, FRA_SPORT_RANGE, &rule->sport_range)) ||
1047 (fib_rule_port_range_set(&rule->dport_range) &&
1048 nla_put_port_range(skb, FRA_DPORT_RANGE, &rule->dport_range)) ||
1049 (rule->ip_proto && nla_put_u8(skb, FRA_IP_PROTO, rule->ip_proto)))
0e3cea7b 1050 goto nla_put_failure;
6ef94cfa
ST		 1051
1052 if (rule->suppress_ifgroup != -1) {
1053 if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
1054 goto nla_put_failure;
1055 }
1056
04af8cf6 1057 if (ops->fill(rule, skb, frh) < 0)
14c0b97d
TG		 1058 goto nla_put_failure;
1059
053c095a
JB		 1060 nlmsg_end(skb, nlh);
1061 return 0;
14c0b97d
TG		 1062
1063nla_put_failure:
26932566
PM		 1064 nlmsg_cancel(skb, nlh);
1065 return -EMSGSIZE;
14c0b97d
TG		 1066}
1067
c454673d
TG		 1068static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
1069 struct fib_rules_ops *ops)
14c0b97d
TG		 1070{
1071 int idx = 0;
1072 struct fib_rule *rule;
41fc0143 1073 int err = 0;
14c0b97d 1074
e67f88dd
ED		 1075 rcu_read_lock();
1076 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
c454673d 1077 if (idx < cb->args[1])
14c0b97d
TG		 1078 goto skip;
1079
41fc0143
WK		 1080 err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
1081 cb->nlh->nlmsg_seq, RTM_NEWRULE,
1082 NLM_F_MULTI, ops);
1083 if (err)
14c0b97d
TG		 1084 break;
1085skip:
1086 idx++;
1087 }
2907c35f 1088 rcu_read_unlock();
c454673d 1089 cb->args[1] = idx;
14c0b97d
TG		 1090 rules_ops_put(ops);
1091
41fc0143 1092 return err;
14c0b97d
TG		 1093}
1094
4a73e5e5
DA		 1095static int fib_valid_dumprule_req(const struct nlmsghdr *nlh,
1096 struct netlink_ext_ack *extack)
1097{
1098 struct fib_rule_hdr *frh;
1099
1100 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
1101 NL_SET_ERR_MSG(extack, "Invalid header for fib rule dump request");
1102 return -EINVAL;
1103 }
1104
1105 frh = nlmsg_data(nlh);
1106 if (frh->dst_len || frh->src_len || frh->tos || frh->table ||
1107 frh->res1 || frh->res2 || frh->action || frh->flags) {
1108 NL_SET_ERR_MSG(extack,
1109 "Invalid values in header for fib rule dump request");
1110 return -EINVAL;
1111 }
1112
1113 if (nlmsg_attrlen(nlh, sizeof(*frh))) {
1114 NL_SET_ERR_MSG(extack, "Invalid data after header in fib rule dump request");
1115 return -EINVAL;
1116 }
1117
1118 return 0;
1119}
1120
c454673d
TG		 1121static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
1122{
4a73e5e5 1123 const struct nlmsghdr *nlh = cb->nlh;
3b1e0a65 1124 struct net *net = sock_net(skb->sk);
c454673d
TG		 1125 struct fib_rules_ops *ops;
1126 int idx = 0, family;
1127
4a73e5e5
DA		 1128 if (cb->strict_check) {
1129 int err = fib_valid_dumprule_req(nlh, cb->extack);
1130
1131 if (err < 0)
1132 return err;
1133 }
1134
1135 family = rtnl_msg_family(nlh);
c454673d
TG		 1136 if (family != AF_UNSPEC) {
1137 /* Protocol specific dump request */
5fd30ee7 1138 ops = lookup_rules_ops(net, family);
c454673d
TG		 1139 if (ops == NULL)
1140 return -EAFNOSUPPORT;
1141
41fc0143
WK		 1142 dump_rules(skb, cb, ops);
1143
1144 return skb->len;
c454673d
TG		 1145 }
1146
1147 rcu_read_lock();
5fd30ee7 1148 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
c454673d
TG		 1149 if (idx < cb->args[0] || !try_module_get(ops->owner))
1150 goto skip;
1151
1152 if (dump_rules(skb, cb, ops) < 0)
1153 break;
1154
1155 cb->args[1] = 0;
2fb3573d 1156skip:
c454673d
TG		 1157 idx++;
1158 }
1159 rcu_read_unlock();
1160 cb->args[0] = idx;
1161
1162 return skb->len;
1163}
14c0b97d 1164
9e3a5487 1165static void notify_rule_change(int event, struct fib_rule *rule,
c17084d2
TG		 1166 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
1167 u32 pid)
14c0b97d 1168{
9e3a5487 1169 struct net *net;
c17084d2
TG		 1170 struct sk_buff *skb;
1171 int err = -ENOBUFS;
14c0b97d 1172
9e3a5487 1173 net = ops->fro_net;
339bf98f 1174 skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
14c0b97d 1175 if (skb == NULL)
c17084d2
TG		 1176 goto errout;
1177
1178 err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
26932566
PM		 1179 if (err < 0) {
1180 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
1181 WARN_ON(err == -EMSGSIZE);
1182 kfree_skb(skb);
1183 goto errout;
1184 }
9e3a5487 1185
1ce85fe4
PNA		 1186 rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
1187 return;
c17084d2
TG		 1188errout:
1189 if (err < 0)
5fd30ee7 1190 rtnl_set_sk_err(net, ops->nlgroup, err);
14c0b97d
TG		 1191}
1192
1193static void attach_rules(struct list_head *rules, struct net_device *dev)
1194{
1195 struct fib_rule *rule;
1196
1197 list_for_each_entry(rule, rules, list) {
491deb24
PM		 1198 if (rule->iifindex == -1 &&
1199 strcmp(dev->name, rule->iifname) == 0)
1200 rule->iifindex = dev->ifindex;
1b038a5e
PM		 1201 if (rule->oifindex == -1 &&
1202 strcmp(dev->name, rule->oifname) == 0)
1203 rule->oifindex = dev->ifindex;
14c0b97d
TG		 1204 }
1205}
1206
1207static void detach_rules(struct list_head *rules, struct net_device *dev)
1208{
1209 struct fib_rule *rule;
1210
1b038a5e 1211 list_for_each_entry(rule, rules, list) {
491deb24
PM		 1212 if (rule->iifindex == dev->ifindex)
1213 rule->iifindex = -1;
1b038a5e
PM		 1214 if (rule->oifindex == dev->ifindex)
1215 rule->oifindex = -1;
1216 }
14c0b97d
TG		 1217}
1218
1219
1220static int fib_rules_event(struct notifier_block *this, unsigned long event,
351638e7 1221 void *ptr)
14c0b97d 1222{
351638e7 1223 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 1224 struct net *net = dev_net(dev);
14c0b97d
TG		 1225 struct fib_rules_ops *ops;
1226
748e2d93 1227 ASSERT_RTNL();
14c0b97d
TG		 1228
1229 switch (event) {
1230 case NETDEV_REGISTER:
5fd30ee7 1231 list_for_each_entry(ops, &net->rules_ops, list)
76c72d4f 1232 attach_rules(&ops->rules_list, dev);
14c0b97d
TG		 1233 break;
1234
946c032e
MŻ		 1235 case NETDEV_CHANGENAME:
1236 list_for_each_entry(ops, &net->rules_ops, list) {
1237 detach_rules(&ops->rules_list, dev);
1238 attach_rules(&ops->rules_list, dev);
1239 }
1240 break;
1241
14c0b97d 1242 case NETDEV_UNREGISTER:
5fd30ee7 1243 list_for_each_entry(ops, &net->rules_ops, list)
76c72d4f 1244 detach_rules(&ops->rules_list, dev);
14c0b97d
TG		 1245 break;
1246 }
1247
14c0b97d
TG		 1248 return NOTIFY_DONE;
1249}
1250
1251static struct notifier_block fib_rules_notifier = {
1252 .notifier_call = fib_rules_event,
1253};
1254
2c8c1e72 1255static int __net_init fib_rules_net_init(struct net *net)
5fd30ee7
DL		 1256{
1257 INIT_LIST_HEAD(&net->rules_ops);
1258 spin_lock_init(&net->rules_mod_lock);
1259 return 0;
1260}
1261
ce2b7db3
VA		 1262static void __net_exit fib_rules_net_exit(struct net *net)
1263{
1264 WARN_ON_ONCE(!list_empty(&net->rules_ops));
1265}
1266
5fd30ee7
DL		 1267static struct pernet_operations fib_rules_net_ops = {
1268 .init = fib_rules_net_init,
ce2b7db3 1269 .exit = fib_rules_net_exit,
5fd30ee7
DL		 1270};
1271
14c0b97d
TG		 1272static int __init fib_rules_init(void)
1273{
5fd30ee7 1274 int err;
b97bac64
FW		 1275 rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, 0);
1276 rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, 0);
1277 rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, 0);
9d9e6a58 1278
5d6d4809 1279 err = register_pernet_subsys(&fib_rules_net_ops);
5fd30ee7
DL		 1280 if (err < 0)
1281 goto fail;
1282
5d6d4809 1283 err = register_netdevice_notifier(&fib_rules_notifier);
5fd30ee7
DL		 1284 if (err < 0)
1285 goto fail_unregister;
5d6d4809 1286
5fd30ee7
DL		 1287 return 0;
1288
1289fail_unregister:
5d6d4809 1290 unregister_pernet_subsys(&fib_rules_net_ops);
5fd30ee7
DL		 1291fail:
1292 rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
1293 rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
1294 rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
1295 return err;
14c0b97d
TG		 1296}
1297
1298subsys_initcall(fib_rules_init);
Linux 6.x block layer and io_uring tree(s)