1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * net/core/fib_rules.c Generic Routing Rules |
4 | * |
5 | * Authors: Thomas Graf <tgraf@suug.ch> |
6 | */ |
7 | |
8 | #include <linux/types.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/slab.h> |
11 | #include <linux/list.h> |
12 | #include <linux/module.h> |
13 | #include <net/net_namespace.h> |
14 | #include <net/sock.h> |
15 | #include <net/fib_rules.h> |
16 | #include <net/ip_tunnels.h> |
17 | #include <linux/indirect_call_wrapper.h> |
18 | |
19 | #if defined(CONFIG_IPV6) && defined(CONFIG_IPV6_MULTIPLE_TABLES) |
20 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
21 | #define INDIRECT_CALL_MT(f, f2, f1, ...) \ |
22 | INDIRECT_CALL_INET(f, f2, f1, __VA_ARGS__) |
23 | #else |
24 | #define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f2, __VA_ARGS__) |
25 | #endif |
26 | #elif defined(CONFIG_IP_MULTIPLE_TABLES) |
27 | #define INDIRECT_CALL_MT(f, f2, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__) |
28 | #else |
29 | #define INDIRECT_CALL_MT(f, f2, f1, ...) f(__VA_ARGS__) |
30 | #endif |
31 | |
32 | static const struct fib_kuid_range fib_kuid_range_unset = { |
33 | KUIDT_INIT(0), |
34 | KUIDT_INIT(~0), |
35 | }; |
36 | |
37 | bool 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(left: rule->uid_range.start, right: fib_kuid_range_unset.start) || |
45 | !uid_eq(left: rule->uid_range.end, right: fib_kuid_range_unset.end)) |
46 | return false; |
47 | if (fib_rule_port_range_set(range: &rule->sport_range)) |
48 | return false; |
49 | if (fib_rule_port_range_set(range: &rule->dport_range)) |
50 | return false; |
51 | return true; |
52 | } |
53 | EXPORT_SYMBOL_GPL(fib_rule_matchall); |
54 | |
55 | int 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(size: ops->rule_size, GFP_KERNEL_ACCOUNT); |
61 | if (r == NULL) |
62 | return -ENOMEM; |
63 | |
64 | refcount_set(r: &r->refcnt, n: 1); |
65 | r->action = FR_ACT_TO_TBL; |
66 | r->pref = pref; |
67 | r->table = table; |
68 | r->flags = flags; |
69 | r->proto = RTPROT_KERNEL; |
70 | r->fr_net = ops->fro_net; |
71 | r->uid_range = fib_kuid_range_unset; |
72 | |
73 | r->suppress_prefixlen = -1; |
74 | r->suppress_ifgroup = -1; |
75 | |
76 | /* The lock is not required here, the list in unreacheable |
77 | * at the moment this function is called */ |
78 | list_add_tail(new: &r->list, head: &ops->rules_list); |
79 | return 0; |
80 | } |
81 | EXPORT_SYMBOL(fib_default_rule_add); |
82 | |
83 | static u32 fib_default_rule_pref(struct fib_rules_ops *ops) |
84 | { |
85 | struct list_head *pos; |
86 | struct fib_rule *rule; |
87 | |
88 | if (!list_empty(head: &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 | } |
99 | |
100 | static void notify_rule_change(int event, struct fib_rule *rule, |
101 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
102 | u32 pid); |
103 | |
104 | static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family) |
105 | { |
106 | struct fib_rules_ops *ops; |
107 | |
108 | rcu_read_lock(); |
109 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
110 | if (ops->family == family) { |
111 | if (!try_module_get(module: ops->owner)) |
112 | ops = NULL; |
113 | rcu_read_unlock(); |
114 | return ops; |
115 | } |
116 | } |
117 | rcu_read_unlock(); |
118 | |
119 | return NULL; |
120 | } |
121 | |
122 | static void rules_ops_put(struct fib_rules_ops *ops) |
123 | { |
124 | if (ops) |
125 | module_put(module: ops->owner); |
126 | } |
127 | |
128 | static void flush_route_cache(struct fib_rules_ops *ops) |
129 | { |
130 | if (ops->flush_cache) |
131 | ops->flush_cache(ops); |
132 | } |
133 | |
134 | static int __fib_rules_register(struct fib_rules_ops *ops) |
135 | { |
136 | int err = -EEXIST; |
137 | struct fib_rules_ops *o; |
138 | struct net *net; |
139 | |
140 | net = ops->fro_net; |
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 | |
150 | spin_lock(lock: &net->rules_mod_lock); |
151 | list_for_each_entry(o, &net->rules_ops, list) |
152 | if (ops->family == o->family) |
153 | goto errout; |
154 | |
155 | list_add_tail_rcu(new: &ops->list, head: &net->rules_ops); |
156 | err = 0; |
157 | errout: |
158 | spin_unlock(lock: &net->rules_mod_lock); |
159 | |
160 | return err; |
161 | } |
162 | |
163 | struct fib_rules_ops * |
164 | fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net) |
165 | { |
166 | struct fib_rules_ops *ops; |
167 | int err; |
168 | |
169 | ops = kmemdup(p: tmpl, size: sizeof(*ops), GFP_KERNEL); |
170 | if (ops == NULL) |
171 | return ERR_PTR(error: -ENOMEM); |
172 | |
173 | INIT_LIST_HEAD(list: &ops->rules_list); |
174 | ops->fro_net = net; |
175 | |
176 | err = __fib_rules_register(ops); |
177 | if (err) { |
178 | kfree(objp: ops); |
179 | ops = ERR_PTR(error: err); |
180 | } |
181 | |
182 | return ops; |
183 | } |
184 | EXPORT_SYMBOL_GPL(fib_rules_register); |
185 | |
186 | static void fib_rules_cleanup_ops(struct fib_rules_ops *ops) |
187 | { |
188 | struct fib_rule *rule, *tmp; |
189 | |
190 | list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) { |
191 | list_del_rcu(entry: &rule->list); |
192 | if (ops->delete) |
193 | ops->delete(rule); |
194 | fib_rule_put(rule); |
195 | } |
196 | } |
197 | |
198 | void fib_rules_unregister(struct fib_rules_ops *ops) |
199 | { |
200 | struct net *net = ops->fro_net; |
201 | |
202 | spin_lock(lock: &net->rules_mod_lock); |
203 | list_del_rcu(entry: &ops->list); |
204 | spin_unlock(lock: &net->rules_mod_lock); |
205 | |
206 | fib_rules_cleanup_ops(ops); |
207 | kfree_rcu(ops, rcu); |
208 | } |
209 | EXPORT_SYMBOL_GPL(fib_rules_unregister); |
210 | |
211 | static int uid_range_set(struct fib_kuid_range *range) |
212 | { |
213 | return uid_valid(uid: range->start) && uid_valid(uid: range->end); |
214 | } |
215 | |
216 | static 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(nla: tb[FRA_UID_RANGE]); |
222 | |
223 | out.start = make_kuid(current_user_ns(), uid: in->start); |
224 | out.end = make_kuid(current_user_ns(), uid: in->end); |
225 | |
226 | return out; |
227 | } |
228 | |
229 | static 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(), uid: range->start), |
233 | from_kuid_munged(current_user_ns(), uid: range->end) |
234 | }; |
235 | |
236 | return nla_put(skb, attrtype: FRA_UID_RANGE, attrlen: sizeof(out), data: &out); |
237 | } |
238 | |
239 | static 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(nla: pattr); |
243 | |
244 | if (!fib_rule_port_range_valid(a: pr)) |
245 | return -EINVAL; |
246 | |
247 | port_range->start = pr->start; |
248 | port_range->end = pr->end; |
249 | |
250 | return 0; |
251 | } |
252 | |
253 | static 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, attrlen: sizeof(*range), data: range); |
257 | } |
258 | |
259 | static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops, |
260 | struct flowi *fl, int flags, |
261 | struct fib_lookup_arg *arg) |
262 | { |
263 | int ret = 0; |
264 | |
265 | if (rule->iifindex && (rule->iifindex != fl->flowi_iif)) |
266 | goto out; |
267 | |
268 | if (rule->oifindex && (rule->oifindex != fl->flowi_oif)) |
269 | goto out; |
270 | |
271 | if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask) |
272 | goto out; |
273 | |
274 | if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id)) |
275 | goto out; |
276 | |
277 | if (rule->l3mdev && !l3mdev_fib_rule_match(net: rule->fr_net, fl, arg)) |
278 | goto out; |
279 | |
280 | if (uid_lt(left: fl->flowi_uid, right: rule->uid_range.start) || |
281 | uid_gt(left: fl->flowi_uid, right: rule->uid_range.end)) |
282 | goto out; |
283 | |
284 | ret = INDIRECT_CALL_MT(ops->match, |
285 | fib6_rule_match, |
286 | fib4_rule_match, |
287 | rule, fl, flags); |
288 | out: |
289 | return (rule->flags & FIB_RULE_INVERT) ? !ret : ret; |
290 | } |
291 | |
292 | int 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 | |
300 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { |
301 | jumped: |
302 | if (!fib_rule_match(rule, ops, fl, flags, arg)) |
303 | continue; |
304 | |
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 | } |
315 | } else if (rule->action == FR_ACT_NOP) |
316 | continue; |
317 | else |
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, flags, arg)) |
327 | continue; |
328 | |
329 | if (err != -EAGAIN) { |
330 | if ((arg->flags & FIB_LOOKUP_NOREF) || |
331 | likely(refcount_inc_not_zero(&rule->refcnt))) { |
332 | arg->rule = rule; |
333 | goto out; |
334 | } |
335 | break; |
336 | } |
337 | } |
338 | |
339 | err = -ESRCH; |
340 | out: |
341 | rcu_read_unlock(); |
342 | |
343 | return err; |
344 | } |
345 | EXPORT_SYMBOL_GPL(fib_rules_lookup); |
346 | |
347 | static int call_fib_rule_notifier(struct notifier_block *nb, |
348 | enum fib_event_type event_type, |
349 | struct fib_rule *rule, int family, |
350 | struct netlink_ext_ack *extack) |
351 | { |
352 | struct fib_rule_notifier_info info = { |
353 | .info.family = family, |
354 | .info.extack = extack, |
355 | .rule = rule, |
356 | }; |
357 | |
358 | return call_fib_notifier(nb, event_type, info: &info.info); |
359 | } |
360 | |
361 | static int call_fib_rule_notifiers(struct net *net, |
362 | enum fib_event_type event_type, |
363 | struct fib_rule *rule, |
364 | struct fib_rules_ops *ops, |
365 | struct netlink_ext_ack *extack) |
366 | { |
367 | struct fib_rule_notifier_info info = { |
368 | .info.family = ops->family, |
369 | .info.extack = extack, |
370 | .rule = rule, |
371 | }; |
372 | |
373 | ops->fib_rules_seq++; |
374 | return call_fib_notifiers(net, event_type, info: &info.info); |
375 | } |
376 | |
377 | /* Called with rcu_read_lock() */ |
378 | int fib_rules_dump(struct net *net, struct notifier_block *nb, int family, |
379 | struct netlink_ext_ack *extack) |
380 | { |
381 | struct fib_rules_ops *ops; |
382 | struct fib_rule *rule; |
383 | int err = 0; |
384 | |
385 | ops = lookup_rules_ops(net, family); |
386 | if (!ops) |
387 | return -EAFNOSUPPORT; |
388 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { |
389 | err = call_fib_rule_notifier(nb, event_type: FIB_EVENT_RULE_ADD, |
390 | rule, family, extack); |
391 | if (err) |
392 | break; |
393 | } |
394 | rules_ops_put(ops); |
395 | |
396 | return err; |
397 | } |
398 | EXPORT_SYMBOL_GPL(fib_rules_dump); |
399 | |
400 | unsigned 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 | } |
415 | EXPORT_SYMBOL_GPL(fib_rules_seq_read); |
416 | |
417 | static 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) |
422 | { |
423 | struct fib_rule *r; |
424 | |
425 | list_for_each_entry(r, &ops->rules_list, list) { |
426 | if (rule->action && r->action != rule->action) |
427 | continue; |
428 | |
429 | if (rule->table && r->table != rule->table) |
430 | continue; |
431 | |
432 | if (user_priority && r->pref != rule->pref) |
433 | continue; |
434 | |
435 | if (rule->iifname[0] && |
436 | memcmp(p: r->iifname, q: rule->iifname, IFNAMSIZ)) |
437 | continue; |
438 | |
439 | if (rule->oifname[0] && |
440 | memcmp(p: r->oifname, q: rule->oifname, IFNAMSIZ)) |
441 | continue; |
442 | |
443 | if (rule->mark && r->mark != rule->mark) |
444 | continue; |
445 | |
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 | |
454 | if (rule->mark_mask && r->mark_mask != rule->mark_mask) |
455 | continue; |
456 | |
457 | if (rule->tun_id && r->tun_id != rule->tun_id) |
458 | continue; |
459 | |
460 | if (r->fr_net != rule->fr_net) |
461 | continue; |
462 | |
463 | if (rule->l3mdev && r->l3mdev != rule->l3mdev) |
464 | continue; |
465 | |
466 | if (uid_range_set(range: &rule->uid_range) && |
467 | (!uid_eq(left: r->uid_range.start, right: rule->uid_range.start) || |
468 | !uid_eq(left: r->uid_range.end, right: rule->uid_range.end))) |
469 | continue; |
470 | |
471 | if (rule->ip_proto && r->ip_proto != rule->ip_proto) |
472 | continue; |
473 | |
474 | if (rule->proto && r->proto != rule->proto) |
475 | continue; |
476 | |
477 | if (fib_rule_port_range_set(range: &rule->sport_range) && |
478 | !fib_rule_port_range_compare(a: &r->sport_range, |
479 | b: &rule->sport_range)) |
480 | continue; |
481 | |
482 | if (fib_rule_port_range_set(range: &rule->dport_range) && |
483 | !fib_rule_port_range_compare(a: &r->dport_range, |
484 | b: &rule->dport_range)) |
485 | continue; |
486 | |
487 | if (!ops->compare(r, frh, tb)) |
488 | continue; |
489 | return r; |
490 | } |
491 | |
492 | return NULL; |
493 | } |
494 | |
495 | #ifdef CONFIG_NET_L3_MASTER_DEV |
496 | static 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 |
508 | static 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 | |
516 | static 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) |
522 | { |
523 | struct net *net = sock_net(sk: skb->sk); |
524 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
525 | struct fib_rule *nlrule = NULL; |
526 | int err = -EINVAL; |
527 | |
528 | if (frh->src_len) |
529 | if (!tb[FRA_SRC] || |
530 | frh->src_len > (ops->addr_size * 8) || |
531 | nla_len(nla: tb[FRA_SRC]) != ops->addr_size) { |
532 | NL_SET_ERR_MSG(extack, "Invalid source address" ); |
533 | goto errout; |
534 | } |
535 | |
536 | if (frh->dst_len) |
537 | if (!tb[FRA_DST] || |
538 | frh->dst_len > (ops->addr_size * 8) || |
539 | nla_len(nla: tb[FRA_DST]) != ops->addr_size) { |
540 | NL_SET_ERR_MSG(extack, "Invalid dst address" ); |
541 | goto errout; |
542 | } |
543 | |
544 | nlrule = kzalloc(size: ops->rule_size, GFP_KERNEL_ACCOUNT); |
545 | if (!nlrule) { |
546 | err = -ENOMEM; |
547 | goto errout; |
548 | } |
549 | refcount_set(r: &nlrule->refcnt, n: 1); |
550 | nlrule->fr_net = net; |
551 | |
552 | if (tb[FRA_PRIORITY]) { |
553 | nlrule->pref = nla_get_u32(nla: tb[FRA_PRIORITY]); |
554 | *user_priority = true; |
555 | } else { |
556 | nlrule->pref = fib_default_rule_pref(ops); |
557 | } |
558 | |
559 | nlrule->proto = tb[FRA_PROTOCOL] ? |
560 | nla_get_u8(nla: tb[FRA_PROTOCOL]) : RTPROT_UNSPEC; |
561 | |
562 | if (tb[FRA_IIFNAME]) { |
563 | struct net_device *dev; |
564 | |
565 | nlrule->iifindex = -1; |
566 | nla_strscpy(dst: nlrule->iifname, nla: tb[FRA_IIFNAME], IFNAMSIZ); |
567 | dev = __dev_get_by_name(net, name: nlrule->iifname); |
568 | if (dev) |
569 | nlrule->iifindex = dev->ifindex; |
570 | } |
571 | |
572 | if (tb[FRA_OIFNAME]) { |
573 | struct net_device *dev; |
574 | |
575 | nlrule->oifindex = -1; |
576 | nla_strscpy(dst: nlrule->oifname, nla: tb[FRA_OIFNAME], IFNAMSIZ); |
577 | dev = __dev_get_by_name(net, name: nlrule->oifname); |
578 | if (dev) |
579 | nlrule->oifindex = dev->ifindex; |
580 | } |
581 | |
582 | if (tb[FRA_FWMARK]) { |
583 | nlrule->mark = nla_get_u32(nla: tb[FRA_FWMARK]); |
584 | if (nlrule->mark) |
585 | /* compatibility: if the mark value is non-zero all bits |
586 | * are compared unless a mask is explicitly specified. |
587 | */ |
588 | nlrule->mark_mask = 0xFFFFFFFF; |
589 | } |
590 | |
591 | if (tb[FRA_FWMASK]) |
592 | nlrule->mark_mask = nla_get_u32(nla: tb[FRA_FWMASK]); |
593 | |
594 | if (tb[FRA_TUN_ID]) |
595 | nlrule->tun_id = nla_get_be64(nla: tb[FRA_TUN_ID]); |
596 | |
597 | err = -EINVAL; |
598 | if (tb[FRA_L3MDEV] && |
599 | fib_nl2rule_l3mdev(nla: tb[FRA_L3MDEV], nlrule, extack) < 0) |
600 | goto errout_free; |
601 | |
602 | nlrule->action = frh->action; |
603 | nlrule->flags = frh->flags; |
604 | nlrule->table = frh_get_table(frh, nla: tb); |
605 | if (tb[FRA_SUPPRESS_PREFIXLEN]) |
606 | nlrule->suppress_prefixlen = nla_get_u32(nla: tb[FRA_SUPPRESS_PREFIXLEN]); |
607 | else |
608 | nlrule->suppress_prefixlen = -1; |
609 | |
610 | if (tb[FRA_SUPPRESS_IFGROUP]) |
611 | nlrule->suppress_ifgroup = nla_get_u32(nla: tb[FRA_SUPPRESS_IFGROUP]); |
612 | else |
613 | nlrule->suppress_ifgroup = -1; |
614 | |
615 | if (tb[FRA_GOTO]) { |
616 | if (nlrule->action != FR_ACT_GOTO) { |
617 | NL_SET_ERR_MSG(extack, "Unexpected goto" ); |
618 | goto errout_free; |
619 | } |
620 | |
621 | nlrule->target = nla_get_u32(nla: tb[FRA_GOTO]); |
622 | /* Backward jumps are prohibited to avoid endless loops */ |
623 | if (nlrule->target <= nlrule->pref) { |
624 | NL_SET_ERR_MSG(extack, "Backward goto not supported" ); |
625 | goto errout_free; |
626 | } |
627 | } else if (nlrule->action == FR_ACT_GOTO) { |
628 | NL_SET_ERR_MSG(extack, "Missing goto target for action goto" ); |
629 | goto errout_free; |
630 | } |
631 | |
632 | if (nlrule->l3mdev && nlrule->table) { |
633 | NL_SET_ERR_MSG(extack, "l3mdev and table are mutually exclusive" ); |
634 | goto errout_free; |
635 | } |
636 | |
637 | if (tb[FRA_UID_RANGE]) { |
638 | if (current_user_ns() != net->user_ns) { |
639 | err = -EPERM; |
640 | NL_SET_ERR_MSG(extack, "No permission to set uid" ); |
641 | goto errout_free; |
642 | } |
643 | |
644 | nlrule->uid_range = nla_get_kuid_range(tb); |
645 | |
646 | if (!uid_range_set(range: &nlrule->uid_range) || |
647 | !uid_lte(left: nlrule->uid_range.start, right: nlrule->uid_range.end)) { |
648 | NL_SET_ERR_MSG(extack, "Invalid uid range" ); |
649 | goto errout_free; |
650 | } |
651 | } else { |
652 | nlrule->uid_range = fib_kuid_range_unset; |
653 | } |
654 | |
655 | if (tb[FRA_IP_PROTO]) |
656 | nlrule->ip_proto = nla_get_u8(nla: tb[FRA_IP_PROTO]); |
657 | |
658 | if (tb[FRA_SPORT_RANGE]) { |
659 | err = nla_get_port_range(pattr: tb[FRA_SPORT_RANGE], |
660 | port_range: &nlrule->sport_range); |
661 | if (err) { |
662 | NL_SET_ERR_MSG(extack, "Invalid sport range" ); |
663 | goto errout_free; |
664 | } |
665 | } |
666 | |
667 | if (tb[FRA_DPORT_RANGE]) { |
668 | err = nla_get_port_range(pattr: tb[FRA_DPORT_RANGE], |
669 | port_range: &nlrule->dport_range); |
670 | if (err) { |
671 | NL_SET_ERR_MSG(extack, "Invalid dport range" ); |
672 | goto errout_free; |
673 | } |
674 | } |
675 | |
676 | *rule = nlrule; |
677 | |
678 | return 0; |
679 | |
680 | errout_free: |
681 | kfree(objp: nlrule); |
682 | errout: |
683 | return err; |
684 | } |
685 | |
686 | static 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(p: r->iifname, q: rule->iifname, IFNAMSIZ)) |
702 | continue; |
703 | |
704 | if (memcmp(p: r->oifname, q: 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(left: r->uid_range.start, right: rule->uid_range.start) || |
729 | !uid_eq(left: r->uid_range.end, right: 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(a: &r->sport_range, |
739 | b: &rule->sport_range)) |
740 | continue; |
741 | |
742 | if (!fib_rule_port_range_compare(a: &r->dport_range, |
743 | b: &rule->dport_range)) |
744 | continue; |
745 | |
746 | if (!ops->compare(r, frh, tb)) |
747 | continue; |
748 | return 1; |
749 | } |
750 | return 0; |
751 | } |
752 | |
753 | static const struct nla_policy fib_rule_policy[FRA_MAX + 1] = { |
754 | [FRA_UNSPEC] = { .strict_start_type = FRA_DPORT_RANGE + 1 }, |
755 | [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
756 | [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
757 | [FRA_PRIORITY] = { .type = NLA_U32 }, |
758 | [FRA_FWMARK] = { .type = NLA_U32 }, |
759 | [FRA_FLOW] = { .type = NLA_U32 }, |
760 | [FRA_TUN_ID] = { .type = NLA_U64 }, |
761 | [FRA_FWMASK] = { .type = NLA_U32 }, |
762 | [FRA_TABLE] = { .type = NLA_U32 }, |
763 | [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, |
764 | [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, |
765 | [FRA_GOTO] = { .type = NLA_U32 }, |
766 | [FRA_L3MDEV] = { .type = NLA_U8 }, |
767 | [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }, |
768 | [FRA_PROTOCOL] = { .type = NLA_U8 }, |
769 | [FRA_IP_PROTO] = { .type = NLA_U8 }, |
770 | [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }, |
771 | [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) } |
772 | }; |
773 | |
774 | int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, |
775 | struct netlink_ext_ack *extack) |
776 | { |
777 | struct net *net = sock_net(sk: skb->sk); |
778 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
779 | struct fib_rules_ops *ops = NULL; |
780 | struct fib_rule *rule = NULL, *r, *last = NULL; |
781 | struct nlattr *tb[FRA_MAX + 1]; |
782 | int err = -EINVAL, unresolved = 0; |
783 | bool user_priority = false; |
784 | |
785 | if (nlh->nlmsg_len < nlmsg_msg_size(payload: sizeof(*frh))) { |
786 | NL_SET_ERR_MSG(extack, "Invalid msg length" ); |
787 | goto errout; |
788 | } |
789 | |
790 | ops = lookup_rules_ops(net, family: frh->family); |
791 | if (!ops) { |
792 | err = -EAFNOSUPPORT; |
793 | NL_SET_ERR_MSG(extack, "Rule family not supported" ); |
794 | goto errout; |
795 | } |
796 | |
797 | err = nlmsg_parse_deprecated(nlh, hdrlen: sizeof(*frh), tb, FRA_MAX, |
798 | policy: fib_rule_policy, extack); |
799 | if (err < 0) { |
800 | NL_SET_ERR_MSG(extack, "Error parsing msg" ); |
801 | goto errout; |
802 | } |
803 | |
804 | err = fib_nl2rule(skb, nlh, extack, ops, tb, rule: &rule, user_priority: &user_priority); |
805 | if (err) |
806 | goto errout; |
807 | |
808 | if ((nlh->nlmsg_flags & NLM_F_EXCL) && |
809 | rule_exists(ops, frh, tb, rule)) { |
810 | err = -EEXIST; |
811 | goto errout_free; |
812 | } |
813 | |
814 | err = ops->configure(rule, skb, frh, tb, extack); |
815 | if (err < 0) |
816 | goto errout_free; |
817 | |
818 | err = call_fib_rule_notifiers(net, event_type: FIB_EVENT_RULE_ADD, rule, ops, |
819 | extack); |
820 | if (err < 0) |
821 | goto errout_free; |
822 | |
823 | list_for_each_entry(r, &ops->rules_list, list) { |
824 | if (r->pref == rule->target) { |
825 | RCU_INIT_POINTER(rule->ctarget, r); |
826 | break; |
827 | } |
828 | } |
829 | |
830 | if (rcu_dereference_protected(rule->ctarget, 1) == NULL) |
831 | unresolved = 1; |
832 | |
833 | list_for_each_entry(r, &ops->rules_list, list) { |
834 | if (r->pref > rule->pref) |
835 | break; |
836 | last = r; |
837 | } |
838 | |
839 | if (last) |
840 | list_add_rcu(new: &rule->list, head: &last->list); |
841 | else |
842 | list_add_rcu(new: &rule->list, head: &ops->rules_list); |
843 | |
844 | if (ops->unresolved_rules) { |
845 | /* |
846 | * There are unresolved goto rules in the list, check if |
847 | * any of them are pointing to this new rule. |
848 | */ |
849 | list_for_each_entry(r, &ops->rules_list, list) { |
850 | if (r->action == FR_ACT_GOTO && |
851 | r->target == rule->pref && |
852 | rtnl_dereference(r->ctarget) == NULL) { |
853 | rcu_assign_pointer(r->ctarget, rule); |
854 | if (--ops->unresolved_rules == 0) |
855 | break; |
856 | } |
857 | } |
858 | } |
859 | |
860 | if (rule->action == FR_ACT_GOTO) |
861 | ops->nr_goto_rules++; |
862 | |
863 | if (unresolved) |
864 | ops->unresolved_rules++; |
865 | |
866 | if (rule->tun_id) |
867 | ip_tunnel_need_metadata(); |
868 | |
869 | notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid); |
870 | flush_route_cache(ops); |
871 | rules_ops_put(ops); |
872 | return 0; |
873 | |
874 | errout_free: |
875 | kfree(objp: rule); |
876 | errout: |
877 | rules_ops_put(ops); |
878 | return err; |
879 | } |
880 | EXPORT_SYMBOL_GPL(fib_nl_newrule); |
881 | |
882 | int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, |
883 | struct netlink_ext_ack *extack) |
884 | { |
885 | struct net *net = sock_net(sk: skb->sk); |
886 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
887 | struct fib_rules_ops *ops = NULL; |
888 | struct fib_rule *rule = NULL, *r, *nlrule = NULL; |
889 | struct nlattr *tb[FRA_MAX+1]; |
890 | int err = -EINVAL; |
891 | bool user_priority = false; |
892 | |
893 | if (nlh->nlmsg_len < nlmsg_msg_size(payload: sizeof(*frh))) { |
894 | NL_SET_ERR_MSG(extack, "Invalid msg length" ); |
895 | goto errout; |
896 | } |
897 | |
898 | ops = lookup_rules_ops(net, family: frh->family); |
899 | if (ops == NULL) { |
900 | err = -EAFNOSUPPORT; |
901 | NL_SET_ERR_MSG(extack, "Rule family not supported" ); |
902 | goto errout; |
903 | } |
904 | |
905 | err = nlmsg_parse_deprecated(nlh, hdrlen: sizeof(*frh), tb, FRA_MAX, |
906 | policy: fib_rule_policy, extack); |
907 | if (err < 0) { |
908 | NL_SET_ERR_MSG(extack, "Error parsing msg" ); |
909 | goto errout; |
910 | } |
911 | |
912 | err = fib_nl2rule(skb, nlh, extack, ops, tb, rule: &nlrule, user_priority: &user_priority); |
913 | if (err) |
914 | goto errout; |
915 | |
916 | rule = rule_find(ops, frh, tb, rule: nlrule, user_priority); |
917 | if (!rule) { |
918 | err = -ENOENT; |
919 | goto errout; |
920 | } |
921 | |
922 | if (rule->flags & FIB_RULE_PERMANENT) { |
923 | err = -EPERM; |
924 | goto errout; |
925 | } |
926 | |
927 | if (ops->delete) { |
928 | err = ops->delete(rule); |
929 | if (err) |
930 | goto errout; |
931 | } |
932 | |
933 | if (rule->tun_id) |
934 | ip_tunnel_unneed_metadata(); |
935 | |
936 | list_del_rcu(entry: &rule->list); |
937 | |
938 | if (rule->action == FR_ACT_GOTO) { |
939 | ops->nr_goto_rules--; |
940 | if (rtnl_dereference(rule->ctarget) == NULL) |
941 | ops->unresolved_rules--; |
942 | } |
943 | |
944 | /* |
945 | * Check if this rule is a target to any of them. If so, |
946 | * adjust to the next one with the same preference or |
947 | * disable them. As this operation is eventually very |
948 | * expensive, it is only performed if goto rules, except |
949 | * current if it is goto rule, have actually been added. |
950 | */ |
951 | if (ops->nr_goto_rules > 0) { |
952 | struct fib_rule *n; |
953 | |
954 | n = list_next_entry(rule, list); |
955 | if (&n->list == &ops->rules_list || n->pref != rule->pref) |
956 | n = NULL; |
957 | list_for_each_entry(r, &ops->rules_list, list) { |
958 | if (rtnl_dereference(r->ctarget) != rule) |
959 | continue; |
960 | rcu_assign_pointer(r->ctarget, n); |
961 | if (!n) |
962 | ops->unresolved_rules++; |
963 | } |
964 | } |
965 | |
966 | call_fib_rule_notifiers(net, event_type: FIB_EVENT_RULE_DEL, rule, ops, |
967 | NULL); |
968 | notify_rule_change(RTM_DELRULE, rule, ops, nlh, |
969 | NETLINK_CB(skb).portid); |
970 | fib_rule_put(rule); |
971 | flush_route_cache(ops); |
972 | rules_ops_put(ops); |
973 | kfree(objp: nlrule); |
974 | return 0; |
975 | |
976 | errout: |
977 | kfree(objp: nlrule); |
978 | rules_ops_put(ops); |
979 | return err; |
980 | } |
981 | EXPORT_SYMBOL_GPL(fib_nl_delrule); |
982 | |
983 | static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, |
984 | struct fib_rule *rule) |
985 | { |
986 | size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)) |
987 | + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */ |
988 | + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */ |
989 | + nla_total_size(payload: 4) /* FRA_PRIORITY */ |
990 | + nla_total_size(payload: 4) /* FRA_TABLE */ |
991 | + nla_total_size(payload: 4) /* FRA_SUPPRESS_PREFIXLEN */ |
992 | + nla_total_size(payload: 4) /* FRA_SUPPRESS_IFGROUP */ |
993 | + nla_total_size(payload: 4) /* FRA_FWMARK */ |
994 | + nla_total_size(payload: 4) /* FRA_FWMASK */ |
995 | + nla_total_size_64bit(payload: 8) /* FRA_TUN_ID */ |
996 | + nla_total_size(payload: sizeof(struct fib_kuid_range)) |
997 | + nla_total_size(payload: 1) /* FRA_PROTOCOL */ |
998 | + nla_total_size(payload: 1) /* FRA_IP_PROTO */ |
999 | + nla_total_size(payload: sizeof(struct fib_rule_port_range)) /* FRA_SPORT_RANGE */ |
1000 | + nla_total_size(payload: sizeof(struct fib_rule_port_range)); /* FRA_DPORT_RANGE */ |
1001 | |
1002 | if (ops->nlmsg_payload) |
1003 | payload += ops->nlmsg_payload(rule); |
1004 | |
1005 | return payload; |
1006 | } |
1007 | |
1008 | static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, |
1009 | u32 pid, u32 seq, int type, int flags, |
1010 | struct fib_rules_ops *ops) |
1011 | { |
1012 | struct nlmsghdr *nlh; |
1013 | struct fib_rule_hdr *frh; |
1014 | |
1015 | nlh = nlmsg_put(skb, portid: pid, seq, type, payload: sizeof(*frh), flags); |
1016 | if (nlh == NULL) |
1017 | return -EMSGSIZE; |
1018 | |
1019 | frh = nlmsg_data(nlh); |
1020 | frh->family = ops->family; |
1021 | frh->table = rule->table < 256 ? rule->table : RT_TABLE_COMPAT; |
1022 | if (nla_put_u32(skb, attrtype: FRA_TABLE, value: rule->table)) |
1023 | goto nla_put_failure; |
1024 | if (nla_put_u32(skb, attrtype: FRA_SUPPRESS_PREFIXLEN, value: rule->suppress_prefixlen)) |
1025 | goto nla_put_failure; |
1026 | frh->res1 = 0; |
1027 | frh->res2 = 0; |
1028 | frh->action = rule->action; |
1029 | frh->flags = rule->flags; |
1030 | |
1031 | if (nla_put_u8(skb, attrtype: FRA_PROTOCOL, value: rule->proto)) |
1032 | goto nla_put_failure; |
1033 | |
1034 | if (rule->action == FR_ACT_GOTO && |
1035 | rcu_access_pointer(rule->ctarget) == NULL) |
1036 | frh->flags |= FIB_RULE_UNRESOLVED; |
1037 | |
1038 | if (rule->iifname[0]) { |
1039 | if (nla_put_string(skb, attrtype: FRA_IIFNAME, str: rule->iifname)) |
1040 | goto nla_put_failure; |
1041 | if (rule->iifindex == -1) |
1042 | frh->flags |= FIB_RULE_IIF_DETACHED; |
1043 | } |
1044 | |
1045 | if (rule->oifname[0]) { |
1046 | if (nla_put_string(skb, attrtype: FRA_OIFNAME, str: rule->oifname)) |
1047 | goto nla_put_failure; |
1048 | if (rule->oifindex == -1) |
1049 | frh->flags |= FIB_RULE_OIF_DETACHED; |
1050 | } |
1051 | |
1052 | if ((rule->pref && |
1053 | nla_put_u32(skb, attrtype: FRA_PRIORITY, value: rule->pref)) || |
1054 | (rule->mark && |
1055 | nla_put_u32(skb, attrtype: FRA_FWMARK, value: rule->mark)) || |
1056 | ((rule->mark_mask || rule->mark) && |
1057 | nla_put_u32(skb, attrtype: FRA_FWMASK, value: rule->mark_mask)) || |
1058 | (rule->target && |
1059 | nla_put_u32(skb, attrtype: FRA_GOTO, value: rule->target)) || |
1060 | (rule->tun_id && |
1061 | nla_put_be64(skb, attrtype: FRA_TUN_ID, value: rule->tun_id, padattr: FRA_PAD)) || |
1062 | (rule->l3mdev && |
1063 | nla_put_u8(skb, attrtype: FRA_L3MDEV, value: rule->l3mdev)) || |
1064 | (uid_range_set(range: &rule->uid_range) && |
1065 | nla_put_uid_range(skb, range: &rule->uid_range)) || |
1066 | (fib_rule_port_range_set(range: &rule->sport_range) && |
1067 | nla_put_port_range(skb, attrtype: FRA_SPORT_RANGE, range: &rule->sport_range)) || |
1068 | (fib_rule_port_range_set(range: &rule->dport_range) && |
1069 | nla_put_port_range(skb, attrtype: FRA_DPORT_RANGE, range: &rule->dport_range)) || |
1070 | (rule->ip_proto && nla_put_u8(skb, attrtype: FRA_IP_PROTO, value: rule->ip_proto))) |
1071 | goto nla_put_failure; |
1072 | |
1073 | if (rule->suppress_ifgroup != -1) { |
1074 | if (nla_put_u32(skb, attrtype: FRA_SUPPRESS_IFGROUP, value: rule->suppress_ifgroup)) |
1075 | goto nla_put_failure; |
1076 | } |
1077 | |
1078 | if (ops->fill(rule, skb, frh) < 0) |
1079 | goto nla_put_failure; |
1080 | |
1081 | nlmsg_end(skb, nlh); |
1082 | return 0; |
1083 | |
1084 | nla_put_failure: |
1085 | nlmsg_cancel(skb, nlh); |
1086 | return -EMSGSIZE; |
1087 | } |
1088 | |
1089 | static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb, |
1090 | struct fib_rules_ops *ops) |
1091 | { |
1092 | int idx = 0; |
1093 | struct fib_rule *rule; |
1094 | int err = 0; |
1095 | |
1096 | rcu_read_lock(); |
1097 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { |
1098 | if (idx < cb->args[1]) |
1099 | goto skip; |
1100 | |
1101 | err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid, |
1102 | seq: cb->nlh->nlmsg_seq, RTM_NEWRULE, |
1103 | NLM_F_MULTI, ops); |
1104 | if (err) |
1105 | break; |
1106 | skip: |
1107 | idx++; |
1108 | } |
1109 | rcu_read_unlock(); |
1110 | cb->args[1] = idx; |
1111 | rules_ops_put(ops); |
1112 | |
1113 | return err; |
1114 | } |
1115 | |
1116 | static int fib_valid_dumprule_req(const struct nlmsghdr *nlh, |
1117 | struct netlink_ext_ack *extack) |
1118 | { |
1119 | struct fib_rule_hdr *frh; |
1120 | |
1121 | if (nlh->nlmsg_len < nlmsg_msg_size(payload: sizeof(*frh))) { |
1122 | NL_SET_ERR_MSG(extack, "Invalid header for fib rule dump request" ); |
1123 | return -EINVAL; |
1124 | } |
1125 | |
1126 | frh = nlmsg_data(nlh); |
1127 | if (frh->dst_len || frh->src_len || frh->tos || frh->table || |
1128 | frh->res1 || frh->res2 || frh->action || frh->flags) { |
1129 | NL_SET_ERR_MSG(extack, |
1130 | "Invalid values in header for fib rule dump request" ); |
1131 | return -EINVAL; |
1132 | } |
1133 | |
1134 | if (nlmsg_attrlen(nlh, hdrlen: sizeof(*frh))) { |
1135 | NL_SET_ERR_MSG(extack, "Invalid data after header in fib rule dump request" ); |
1136 | return -EINVAL; |
1137 | } |
1138 | |
1139 | return 0; |
1140 | } |
1141 | |
1142 | static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb) |
1143 | { |
1144 | const struct nlmsghdr *nlh = cb->nlh; |
1145 | struct net *net = sock_net(sk: skb->sk); |
1146 | struct fib_rules_ops *ops; |
1147 | int idx = 0, family; |
1148 | |
1149 | if (cb->strict_check) { |
1150 | int err = fib_valid_dumprule_req(nlh, extack: cb->extack); |
1151 | |
1152 | if (err < 0) |
1153 | return err; |
1154 | } |
1155 | |
1156 | family = rtnl_msg_family(nlh); |
1157 | if (family != AF_UNSPEC) { |
1158 | /* Protocol specific dump request */ |
1159 | ops = lookup_rules_ops(net, family); |
1160 | if (ops == NULL) |
1161 | return -EAFNOSUPPORT; |
1162 | |
1163 | dump_rules(skb, cb, ops); |
1164 | |
1165 | return skb->len; |
1166 | } |
1167 | |
1168 | rcu_read_lock(); |
1169 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
1170 | if (idx < cb->args[0] || !try_module_get(module: ops->owner)) |
1171 | goto skip; |
1172 | |
1173 | if (dump_rules(skb, cb, ops) < 0) |
1174 | break; |
1175 | |
1176 | cb->args[1] = 0; |
1177 | skip: |
1178 | idx++; |
1179 | } |
1180 | rcu_read_unlock(); |
1181 | cb->args[0] = idx; |
1182 | |
1183 | return skb->len; |
1184 | } |
1185 | |
1186 | static void notify_rule_change(int event, struct fib_rule *rule, |
1187 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
1188 | u32 pid) |
1189 | { |
1190 | struct net *net; |
1191 | struct sk_buff *skb; |
1192 | int err = -ENOMEM; |
1193 | |
1194 | net = ops->fro_net; |
1195 | skb = nlmsg_new(payload: fib_rule_nlmsg_size(ops, rule), GFP_KERNEL); |
1196 | if (skb == NULL) |
1197 | goto errout; |
1198 | |
1199 | err = fib_nl_fill_rule(skb, rule, pid, seq: nlh->nlmsg_seq, type: event, flags: 0, ops); |
1200 | if (err < 0) { |
1201 | /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */ |
1202 | WARN_ON(err == -EMSGSIZE); |
1203 | kfree_skb(skb); |
1204 | goto errout; |
1205 | } |
1206 | |
1207 | rtnl_notify(skb, net, pid, group: ops->nlgroup, nlh, GFP_KERNEL); |
1208 | return; |
1209 | errout: |
1210 | if (err < 0) |
1211 | rtnl_set_sk_err(net, group: ops->nlgroup, error: err); |
1212 | } |
1213 | |
1214 | static void attach_rules(struct list_head *rules, struct net_device *dev) |
1215 | { |
1216 | struct fib_rule *rule; |
1217 | |
1218 | list_for_each_entry(rule, rules, list) { |
1219 | if (rule->iifindex == -1 && |
1220 | strcmp(dev->name, rule->iifname) == 0) |
1221 | rule->iifindex = dev->ifindex; |
1222 | if (rule->oifindex == -1 && |
1223 | strcmp(dev->name, rule->oifname) == 0) |
1224 | rule->oifindex = dev->ifindex; |
1225 | } |
1226 | } |
1227 | |
1228 | static void detach_rules(struct list_head *rules, struct net_device *dev) |
1229 | { |
1230 | struct fib_rule *rule; |
1231 | |
1232 | list_for_each_entry(rule, rules, list) { |
1233 | if (rule->iifindex == dev->ifindex) |
1234 | rule->iifindex = -1; |
1235 | if (rule->oifindex == dev->ifindex) |
1236 | rule->oifindex = -1; |
1237 | } |
1238 | } |
1239 | |
1240 | |
1241 | static int fib_rules_event(struct notifier_block *this, unsigned long event, |
1242 | void *ptr) |
1243 | { |
1244 | struct net_device *dev = netdev_notifier_info_to_dev(info: ptr); |
1245 | struct net *net = dev_net(dev); |
1246 | struct fib_rules_ops *ops; |
1247 | |
1248 | ASSERT_RTNL(); |
1249 | |
1250 | switch (event) { |
1251 | case NETDEV_REGISTER: |
1252 | list_for_each_entry(ops, &net->rules_ops, list) |
1253 | attach_rules(rules: &ops->rules_list, dev); |
1254 | break; |
1255 | |
1256 | case NETDEV_CHANGENAME: |
1257 | list_for_each_entry(ops, &net->rules_ops, list) { |
1258 | detach_rules(rules: &ops->rules_list, dev); |
1259 | attach_rules(rules: &ops->rules_list, dev); |
1260 | } |
1261 | break; |
1262 | |
1263 | case NETDEV_UNREGISTER: |
1264 | list_for_each_entry(ops, &net->rules_ops, list) |
1265 | detach_rules(rules: &ops->rules_list, dev); |
1266 | break; |
1267 | } |
1268 | |
1269 | return NOTIFY_DONE; |
1270 | } |
1271 | |
1272 | static struct notifier_block fib_rules_notifier = { |
1273 | .notifier_call = fib_rules_event, |
1274 | }; |
1275 | |
1276 | static int __net_init fib_rules_net_init(struct net *net) |
1277 | { |
1278 | INIT_LIST_HEAD(list: &net->rules_ops); |
1279 | spin_lock_init(&net->rules_mod_lock); |
1280 | return 0; |
1281 | } |
1282 | |
1283 | static void __net_exit fib_rules_net_exit(struct net *net) |
1284 | { |
1285 | WARN_ON_ONCE(!list_empty(&net->rules_ops)); |
1286 | } |
1287 | |
1288 | static struct pernet_operations fib_rules_net_ops = { |
1289 | .init = fib_rules_net_init, |
1290 | .exit = fib_rules_net_exit, |
1291 | }; |
1292 | |
1293 | static int __init fib_rules_init(void) |
1294 | { |
1295 | int err; |
1296 | rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, flags: 0); |
1297 | rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, flags: 0); |
1298 | rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, flags: 0); |
1299 | |
1300 | err = register_pernet_subsys(&fib_rules_net_ops); |
1301 | if (err < 0) |
1302 | goto fail; |
1303 | |
1304 | err = register_netdevice_notifier(nb: &fib_rules_notifier); |
1305 | if (err < 0) |
1306 | goto fail_unregister; |
1307 | |
1308 | return 0; |
1309 | |
1310 | fail_unregister: |
1311 | unregister_pernet_subsys(&fib_rules_net_ops); |
1312 | fail: |
1313 | rtnl_unregister(PF_UNSPEC, RTM_NEWRULE); |
1314 | rtnl_unregister(PF_UNSPEC, RTM_DELRULE); |
1315 | rtnl_unregister(PF_UNSPEC, RTM_GETRULE); |
1316 | return err; |
1317 | } |
1318 | |
1319 | subsys_initcall(fib_rules_init); |
1320 | |