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[mirror_ubuntu-bionic-kernel.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/bitops.h>
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/kernel.h>
25 #include <linux/timer.h>
26 #include <linux/string.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/fcntl.h>
30 #include <linux/mm.h>
31 #include <linux/slab.h>
32 #include <linux/interrupt.h>
33 #include <linux/capability.h>
34 #include <linux/skbuff.h>
35 #include <linux/init.h>
36 #include <linux/security.h>
37 #include <linux/mutex.h>
38 #include <linux/if_addr.h>
39 #include <linux/if_bridge.h>
40 #include <linux/if_vlan.h>
41 #include <linux/pci.h>
42 #include <linux/etherdevice.h>
43 #include <linux/bpf.h>
44
45 #include <linux/uaccess.h>
46
47 #include <linux/inet.h>
48 #include <linux/netdevice.h>
49 #include <net/switchdev.h>
50 #include <net/ip.h>
51 #include <net/protocol.h>
52 #include <net/arp.h>
53 #include <net/route.h>
54 #include <net/udp.h>
55 #include <net/tcp.h>
56 #include <net/sock.h>
57 #include <net/pkt_sched.h>
58 #include <net/fib_rules.h>
59 #include <net/rtnetlink.h>
60 #include <net/net_namespace.h>
61
62 struct rtnl_link {
63 rtnl_doit_func doit;
64 rtnl_dumpit_func dumpit;
65 unsigned int flags;
66 };
67
68 static DEFINE_MUTEX(rtnl_mutex);
69
70 void rtnl_lock(void)
71 {
72 mutex_lock(&rtnl_mutex);
73 }
74 EXPORT_SYMBOL(rtnl_lock);
75
76 static struct sk_buff *defer_kfree_skb_list;
77 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
78 {
79 if (head && tail) {
80 tail->next = defer_kfree_skb_list;
81 defer_kfree_skb_list = head;
82 }
83 }
84 EXPORT_SYMBOL(rtnl_kfree_skbs);
85
86 void __rtnl_unlock(void)
87 {
88 struct sk_buff *head = defer_kfree_skb_list;
89
90 defer_kfree_skb_list = NULL;
91
92 mutex_unlock(&rtnl_mutex);
93
94 while (head) {
95 struct sk_buff *next = head->next;
96
97 kfree_skb(head);
98 cond_resched();
99 head = next;
100 }
101 }
102
103 void rtnl_unlock(void)
104 {
105 /* This fellow will unlock it for us. */
106 netdev_run_todo();
107 }
108 EXPORT_SYMBOL(rtnl_unlock);
109
110 int rtnl_trylock(void)
111 {
112 return mutex_trylock(&rtnl_mutex);
113 }
114 EXPORT_SYMBOL(rtnl_trylock);
115
116 int rtnl_is_locked(void)
117 {
118 return mutex_is_locked(&rtnl_mutex);
119 }
120 EXPORT_SYMBOL(rtnl_is_locked);
121
122 #ifdef CONFIG_PROVE_LOCKING
123 bool lockdep_rtnl_is_held(void)
124 {
125 return lockdep_is_held(&rtnl_mutex);
126 }
127 EXPORT_SYMBOL(lockdep_rtnl_is_held);
128 #endif /* #ifdef CONFIG_PROVE_LOCKING */
129
130 static struct rtnl_link __rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
131 static refcount_t rtnl_msg_handlers_ref[RTNL_FAMILY_MAX + 1];
132
133 static inline int rtm_msgindex(int msgtype)
134 {
135 int msgindex = msgtype - RTM_BASE;
136
137 /*
138 * msgindex < 0 implies someone tried to register a netlink
139 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
140 * the message type has not been added to linux/rtnetlink.h
141 */
142 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
143
144 return msgindex;
145 }
146
147 /**
148 * __rtnl_register - Register a rtnetlink message type
149 * @protocol: Protocol family or PF_UNSPEC
150 * @msgtype: rtnetlink message type
151 * @doit: Function pointer called for each request message
152 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
153 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
154 *
155 * Registers the specified function pointers (at least one of them has
156 * to be non-NULL) to be called whenever a request message for the
157 * specified protocol family and message type is received.
158 *
159 * The special protocol family PF_UNSPEC may be used to define fallback
160 * function pointers for the case when no entry for the specific protocol
161 * family exists.
162 *
163 * Returns 0 on success or a negative error code.
164 */
165 int __rtnl_register(int protocol, int msgtype,
166 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
167 unsigned int flags)
168 {
169 struct rtnl_link *tab;
170 int msgindex;
171
172 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
173 msgindex = rtm_msgindex(msgtype);
174
175 tab = rcu_dereference_raw(rtnl_msg_handlers[protocol]);
176 if (tab == NULL) {
177 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
178 if (tab == NULL)
179 return -ENOBUFS;
180
181 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
182 }
183
184 if (doit)
185 tab[msgindex].doit = doit;
186 if (dumpit)
187 tab[msgindex].dumpit = dumpit;
188 tab[msgindex].flags |= flags;
189
190 return 0;
191 }
192 EXPORT_SYMBOL_GPL(__rtnl_register);
193
194 /**
195 * rtnl_register - Register a rtnetlink message type
196 *
197 * Identical to __rtnl_register() but panics on failure. This is useful
198 * as failure of this function is very unlikely, it can only happen due
199 * to lack of memory when allocating the chain to store all message
200 * handlers for a protocol. Meant for use in init functions where lack
201 * of memory implies no sense in continuing.
202 */
203 void rtnl_register(int protocol, int msgtype,
204 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
205 unsigned int flags)
206 {
207 if (__rtnl_register(protocol, msgtype, doit, dumpit, flags) < 0)
208 panic("Unable to register rtnetlink message handler, "
209 "protocol = %d, message type = %d\n",
210 protocol, msgtype);
211 }
212 EXPORT_SYMBOL_GPL(rtnl_register);
213
214 /**
215 * rtnl_unregister - Unregister a rtnetlink message type
216 * @protocol: Protocol family or PF_UNSPEC
217 * @msgtype: rtnetlink message type
218 *
219 * Returns 0 on success or a negative error code.
220 */
221 int rtnl_unregister(int protocol, int msgtype)
222 {
223 struct rtnl_link *handlers;
224 int msgindex;
225
226 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
227 msgindex = rtm_msgindex(msgtype);
228
229 rtnl_lock();
230 handlers = rtnl_dereference(rtnl_msg_handlers[protocol]);
231 if (!handlers) {
232 rtnl_unlock();
233 return -ENOENT;
234 }
235
236 handlers[msgindex].doit = NULL;
237 handlers[msgindex].dumpit = NULL;
238 handlers[msgindex].flags = 0;
239 rtnl_unlock();
240
241 return 0;
242 }
243 EXPORT_SYMBOL_GPL(rtnl_unregister);
244
245 /**
246 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
247 * @protocol : Protocol family or PF_UNSPEC
248 *
249 * Identical to calling rtnl_unregster() for all registered message types
250 * of a certain protocol family.
251 */
252 void rtnl_unregister_all(int protocol)
253 {
254 struct rtnl_link *handlers;
255
256 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
257
258 rtnl_lock();
259 handlers = rtnl_dereference(rtnl_msg_handlers[protocol]);
260 RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
261 rtnl_unlock();
262
263 synchronize_net();
264
265 while (refcount_read(&rtnl_msg_handlers_ref[protocol]) > 1)
266 schedule();
267 kfree(handlers);
268 }
269 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
270
271 static LIST_HEAD(link_ops);
272
273 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
274 {
275 const struct rtnl_link_ops *ops;
276
277 list_for_each_entry(ops, &link_ops, list) {
278 if (!strcmp(ops->kind, kind))
279 return ops;
280 }
281 return NULL;
282 }
283
284 /**
285 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
286 * @ops: struct rtnl_link_ops * to register
287 *
288 * The caller must hold the rtnl_mutex. This function should be used
289 * by drivers that create devices during module initialization. It
290 * must be called before registering the devices.
291 *
292 * Returns 0 on success or a negative error code.
293 */
294 int __rtnl_link_register(struct rtnl_link_ops *ops)
295 {
296 if (rtnl_link_ops_get(ops->kind))
297 return -EEXIST;
298
299 /* The check for setup is here because if ops
300 * does not have that filled up, it is not possible
301 * to use the ops for creating device. So do not
302 * fill up dellink as well. That disables rtnl_dellink.
303 */
304 if (ops->setup && !ops->dellink)
305 ops->dellink = unregister_netdevice_queue;
306
307 list_add_tail(&ops->list, &link_ops);
308 return 0;
309 }
310 EXPORT_SYMBOL_GPL(__rtnl_link_register);
311
312 /**
313 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
314 * @ops: struct rtnl_link_ops * to register
315 *
316 * Returns 0 on success or a negative error code.
317 */
318 int rtnl_link_register(struct rtnl_link_ops *ops)
319 {
320 int err;
321
322 rtnl_lock();
323 err = __rtnl_link_register(ops);
324 rtnl_unlock();
325 return err;
326 }
327 EXPORT_SYMBOL_GPL(rtnl_link_register);
328
329 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
330 {
331 struct net_device *dev;
332 LIST_HEAD(list_kill);
333
334 for_each_netdev(net, dev) {
335 if (dev->rtnl_link_ops == ops)
336 ops->dellink(dev, &list_kill);
337 }
338 unregister_netdevice_many(&list_kill);
339 }
340
341 /**
342 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
343 * @ops: struct rtnl_link_ops * to unregister
344 *
345 * The caller must hold the rtnl_mutex.
346 */
347 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
348 {
349 struct net *net;
350
351 for_each_net(net) {
352 __rtnl_kill_links(net, ops);
353 }
354 list_del(&ops->list);
355 }
356 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
357
358 /* Return with the rtnl_lock held when there are no network
359 * devices unregistering in any network namespace.
360 */
361 static void rtnl_lock_unregistering_all(void)
362 {
363 struct net *net;
364 bool unregistering;
365 DEFINE_WAIT_FUNC(wait, woken_wake_function);
366
367 add_wait_queue(&netdev_unregistering_wq, &wait);
368 for (;;) {
369 unregistering = false;
370 rtnl_lock();
371 for_each_net(net) {
372 if (net->dev_unreg_count > 0) {
373 unregistering = true;
374 break;
375 }
376 }
377 if (!unregistering)
378 break;
379 __rtnl_unlock();
380
381 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
382 }
383 remove_wait_queue(&netdev_unregistering_wq, &wait);
384 }
385
386 /**
387 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
388 * @ops: struct rtnl_link_ops * to unregister
389 */
390 void rtnl_link_unregister(struct rtnl_link_ops *ops)
391 {
392 /* Close the race with cleanup_net() */
393 mutex_lock(&net_mutex);
394 rtnl_lock_unregistering_all();
395 __rtnl_link_unregister(ops);
396 rtnl_unlock();
397 mutex_unlock(&net_mutex);
398 }
399 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
400
401 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
402 {
403 struct net_device *master_dev;
404 const struct rtnl_link_ops *ops;
405 size_t size = 0;
406
407 rcu_read_lock();
408
409 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
410 if (!master_dev)
411 goto out;
412
413 ops = master_dev->rtnl_link_ops;
414 if (!ops || !ops->get_slave_size)
415 goto out;
416 /* IFLA_INFO_SLAVE_DATA + nested data */
417 size = nla_total_size(sizeof(struct nlattr)) +
418 ops->get_slave_size(master_dev, dev);
419
420 out:
421 rcu_read_unlock();
422 return size;
423 }
424
425 static size_t rtnl_link_get_size(const struct net_device *dev)
426 {
427 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
428 size_t size;
429
430 if (!ops)
431 return 0;
432
433 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
434 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
435
436 if (ops->get_size)
437 /* IFLA_INFO_DATA + nested data */
438 size += nla_total_size(sizeof(struct nlattr)) +
439 ops->get_size(dev);
440
441 if (ops->get_xstats_size)
442 /* IFLA_INFO_XSTATS */
443 size += nla_total_size(ops->get_xstats_size(dev));
444
445 size += rtnl_link_get_slave_info_data_size(dev);
446
447 return size;
448 }
449
450 static LIST_HEAD(rtnl_af_ops);
451
452 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
453 {
454 const struct rtnl_af_ops *ops;
455
456 list_for_each_entry_rcu(ops, &rtnl_af_ops, list) {
457 if (ops->family == family)
458 return ops;
459 }
460
461 return NULL;
462 }
463
464 /**
465 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
466 * @ops: struct rtnl_af_ops * to register
467 *
468 * Returns 0 on success or a negative error code.
469 */
470 void rtnl_af_register(struct rtnl_af_ops *ops)
471 {
472 rtnl_lock();
473 list_add_tail_rcu(&ops->list, &rtnl_af_ops);
474 rtnl_unlock();
475 }
476 EXPORT_SYMBOL_GPL(rtnl_af_register);
477
478 /**
479 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
480 * @ops: struct rtnl_af_ops * to unregister
481 */
482 void rtnl_af_unregister(struct rtnl_af_ops *ops)
483 {
484 rtnl_lock();
485 list_del_rcu(&ops->list);
486 rtnl_unlock();
487
488 synchronize_rcu();
489 }
490 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
491
492 static size_t rtnl_link_get_af_size(const struct net_device *dev,
493 u32 ext_filter_mask)
494 {
495 struct rtnl_af_ops *af_ops;
496 size_t size;
497
498 /* IFLA_AF_SPEC */
499 size = nla_total_size(sizeof(struct nlattr));
500
501 rcu_read_lock();
502 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
503 if (af_ops->get_link_af_size) {
504 /* AF_* + nested data */
505 size += nla_total_size(sizeof(struct nlattr)) +
506 af_ops->get_link_af_size(dev, ext_filter_mask);
507 }
508 }
509 rcu_read_unlock();
510
511 return size;
512 }
513
514 static bool rtnl_have_link_slave_info(const struct net_device *dev)
515 {
516 struct net_device *master_dev;
517 bool ret = false;
518
519 rcu_read_lock();
520
521 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
522 if (master_dev && master_dev->rtnl_link_ops)
523 ret = true;
524 rcu_read_unlock();
525 return ret;
526 }
527
528 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
529 const struct net_device *dev)
530 {
531 struct net_device *master_dev;
532 const struct rtnl_link_ops *ops;
533 struct nlattr *slave_data;
534 int err;
535
536 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
537 if (!master_dev)
538 return 0;
539 ops = master_dev->rtnl_link_ops;
540 if (!ops)
541 return 0;
542 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
543 return -EMSGSIZE;
544 if (ops->fill_slave_info) {
545 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
546 if (!slave_data)
547 return -EMSGSIZE;
548 err = ops->fill_slave_info(skb, master_dev, dev);
549 if (err < 0)
550 goto err_cancel_slave_data;
551 nla_nest_end(skb, slave_data);
552 }
553 return 0;
554
555 err_cancel_slave_data:
556 nla_nest_cancel(skb, slave_data);
557 return err;
558 }
559
560 static int rtnl_link_info_fill(struct sk_buff *skb,
561 const struct net_device *dev)
562 {
563 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
564 struct nlattr *data;
565 int err;
566
567 if (!ops)
568 return 0;
569 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
570 return -EMSGSIZE;
571 if (ops->fill_xstats) {
572 err = ops->fill_xstats(skb, dev);
573 if (err < 0)
574 return err;
575 }
576 if (ops->fill_info) {
577 data = nla_nest_start(skb, IFLA_INFO_DATA);
578 if (data == NULL)
579 return -EMSGSIZE;
580 err = ops->fill_info(skb, dev);
581 if (err < 0)
582 goto err_cancel_data;
583 nla_nest_end(skb, data);
584 }
585 return 0;
586
587 err_cancel_data:
588 nla_nest_cancel(skb, data);
589 return err;
590 }
591
592 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
593 {
594 struct nlattr *linkinfo;
595 int err = -EMSGSIZE;
596
597 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
598 if (linkinfo == NULL)
599 goto out;
600
601 err = rtnl_link_info_fill(skb, dev);
602 if (err < 0)
603 goto err_cancel_link;
604
605 err = rtnl_link_slave_info_fill(skb, dev);
606 if (err < 0)
607 goto err_cancel_link;
608
609 nla_nest_end(skb, linkinfo);
610 return 0;
611
612 err_cancel_link:
613 nla_nest_cancel(skb, linkinfo);
614 out:
615 return err;
616 }
617
618 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
619 {
620 struct sock *rtnl = net->rtnl;
621 int err = 0;
622
623 NETLINK_CB(skb).dst_group = group;
624 if (echo)
625 refcount_inc(&skb->users);
626 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
627 if (echo)
628 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
629 return err;
630 }
631
632 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
633 {
634 struct sock *rtnl = net->rtnl;
635
636 return nlmsg_unicast(rtnl, skb, pid);
637 }
638 EXPORT_SYMBOL(rtnl_unicast);
639
640 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
641 struct nlmsghdr *nlh, gfp_t flags)
642 {
643 struct sock *rtnl = net->rtnl;
644 int report = 0;
645
646 if (nlh)
647 report = nlmsg_report(nlh);
648
649 nlmsg_notify(rtnl, skb, pid, group, report, flags);
650 }
651 EXPORT_SYMBOL(rtnl_notify);
652
653 void rtnl_set_sk_err(struct net *net, u32 group, int error)
654 {
655 struct sock *rtnl = net->rtnl;
656
657 netlink_set_err(rtnl, 0, group, error);
658 }
659 EXPORT_SYMBOL(rtnl_set_sk_err);
660
661 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
662 {
663 struct nlattr *mx;
664 int i, valid = 0;
665
666 mx = nla_nest_start(skb, RTA_METRICS);
667 if (mx == NULL)
668 return -ENOBUFS;
669
670 for (i = 0; i < RTAX_MAX; i++) {
671 if (metrics[i]) {
672 if (i == RTAX_CC_ALGO - 1) {
673 char tmp[TCP_CA_NAME_MAX], *name;
674
675 name = tcp_ca_get_name_by_key(metrics[i], tmp);
676 if (!name)
677 continue;
678 if (nla_put_string(skb, i + 1, name))
679 goto nla_put_failure;
680 } else if (i == RTAX_FEATURES - 1) {
681 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
682
683 if (!user_features)
684 continue;
685 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
686 if (nla_put_u32(skb, i + 1, user_features))
687 goto nla_put_failure;
688 } else {
689 if (nla_put_u32(skb, i + 1, metrics[i]))
690 goto nla_put_failure;
691 }
692 valid++;
693 }
694 }
695
696 if (!valid) {
697 nla_nest_cancel(skb, mx);
698 return 0;
699 }
700
701 return nla_nest_end(skb, mx);
702
703 nla_put_failure:
704 nla_nest_cancel(skb, mx);
705 return -EMSGSIZE;
706 }
707 EXPORT_SYMBOL(rtnetlink_put_metrics);
708
709 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
710 long expires, u32 error)
711 {
712 struct rta_cacheinfo ci = {
713 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
714 .rta_used = dst->__use,
715 .rta_clntref = atomic_read(&(dst->__refcnt)),
716 .rta_error = error,
717 .rta_id = id,
718 };
719
720 if (expires) {
721 unsigned long clock;
722
723 clock = jiffies_to_clock_t(abs(expires));
724 clock = min_t(unsigned long, clock, INT_MAX);
725 ci.rta_expires = (expires > 0) ? clock : -clock;
726 }
727 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
728 }
729 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
730
731 static void set_operstate(struct net_device *dev, unsigned char transition)
732 {
733 unsigned char operstate = dev->operstate;
734
735 switch (transition) {
736 case IF_OPER_UP:
737 if ((operstate == IF_OPER_DORMANT ||
738 operstate == IF_OPER_UNKNOWN) &&
739 !netif_dormant(dev))
740 operstate = IF_OPER_UP;
741 break;
742
743 case IF_OPER_DORMANT:
744 if (operstate == IF_OPER_UP ||
745 operstate == IF_OPER_UNKNOWN)
746 operstate = IF_OPER_DORMANT;
747 break;
748 }
749
750 if (dev->operstate != operstate) {
751 write_lock_bh(&dev_base_lock);
752 dev->operstate = operstate;
753 write_unlock_bh(&dev_base_lock);
754 netdev_state_change(dev);
755 }
756 }
757
758 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
759 {
760 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
761 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
762 }
763
764 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
765 const struct ifinfomsg *ifm)
766 {
767 unsigned int flags = ifm->ifi_flags;
768
769 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
770 if (ifm->ifi_change)
771 flags = (flags & ifm->ifi_change) |
772 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
773
774 return flags;
775 }
776
777 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
778 const struct rtnl_link_stats64 *b)
779 {
780 a->rx_packets = b->rx_packets;
781 a->tx_packets = b->tx_packets;
782 a->rx_bytes = b->rx_bytes;
783 a->tx_bytes = b->tx_bytes;
784 a->rx_errors = b->rx_errors;
785 a->tx_errors = b->tx_errors;
786 a->rx_dropped = b->rx_dropped;
787 a->tx_dropped = b->tx_dropped;
788
789 a->multicast = b->multicast;
790 a->collisions = b->collisions;
791
792 a->rx_length_errors = b->rx_length_errors;
793 a->rx_over_errors = b->rx_over_errors;
794 a->rx_crc_errors = b->rx_crc_errors;
795 a->rx_frame_errors = b->rx_frame_errors;
796 a->rx_fifo_errors = b->rx_fifo_errors;
797 a->rx_missed_errors = b->rx_missed_errors;
798
799 a->tx_aborted_errors = b->tx_aborted_errors;
800 a->tx_carrier_errors = b->tx_carrier_errors;
801 a->tx_fifo_errors = b->tx_fifo_errors;
802 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
803 a->tx_window_errors = b->tx_window_errors;
804
805 a->rx_compressed = b->rx_compressed;
806 a->tx_compressed = b->tx_compressed;
807
808 a->rx_nohandler = b->rx_nohandler;
809 }
810
811 /* All VF info */
812 static inline int rtnl_vfinfo_size(const struct net_device *dev,
813 u32 ext_filter_mask)
814 {
815 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
816 int num_vfs = dev_num_vf(dev->dev.parent);
817 size_t size = nla_total_size(0);
818 size += num_vfs *
819 (nla_total_size(0) +
820 nla_total_size(sizeof(struct ifla_vf_mac)) +
821 nla_total_size(sizeof(struct ifla_vf_vlan)) +
822 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
823 nla_total_size(MAX_VLAN_LIST_LEN *
824 sizeof(struct ifla_vf_vlan_info)) +
825 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
826 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
827 nla_total_size(sizeof(struct ifla_vf_rate)) +
828 nla_total_size(sizeof(struct ifla_vf_link_state)) +
829 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
830 nla_total_size(0) + /* nest IFLA_VF_STATS */
831 /* IFLA_VF_STATS_RX_PACKETS */
832 nla_total_size_64bit(sizeof(__u64)) +
833 /* IFLA_VF_STATS_TX_PACKETS */
834 nla_total_size_64bit(sizeof(__u64)) +
835 /* IFLA_VF_STATS_RX_BYTES */
836 nla_total_size_64bit(sizeof(__u64)) +
837 /* IFLA_VF_STATS_TX_BYTES */
838 nla_total_size_64bit(sizeof(__u64)) +
839 /* IFLA_VF_STATS_BROADCAST */
840 nla_total_size_64bit(sizeof(__u64)) +
841 /* IFLA_VF_STATS_MULTICAST */
842 nla_total_size_64bit(sizeof(__u64)) +
843 nla_total_size(sizeof(struct ifla_vf_trust)));
844 return size;
845 } else
846 return 0;
847 }
848
849 static size_t rtnl_port_size(const struct net_device *dev,
850 u32 ext_filter_mask)
851 {
852 size_t port_size = nla_total_size(4) /* PORT_VF */
853 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
854 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
855 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
856 + nla_total_size(1) /* PROT_VDP_REQUEST */
857 + nla_total_size(2); /* PORT_VDP_RESPONSE */
858 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
859 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
860 + port_size;
861 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
862 + port_size;
863
864 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
865 !(ext_filter_mask & RTEXT_FILTER_VF))
866 return 0;
867 if (dev_num_vf(dev->dev.parent))
868 return port_self_size + vf_ports_size +
869 vf_port_size * dev_num_vf(dev->dev.parent);
870 else
871 return port_self_size;
872 }
873
874 static size_t rtnl_xdp_size(void)
875 {
876 size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */
877 nla_total_size(1) + /* XDP_ATTACHED */
878 nla_total_size(4); /* XDP_PROG_ID */
879
880 return xdp_size;
881 }
882
883 static noinline size_t if_nlmsg_size(const struct net_device *dev,
884 u32 ext_filter_mask)
885 {
886 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
887 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
888 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
889 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
890 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
891 + nla_total_size(sizeof(struct rtnl_link_stats))
892 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
893 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
894 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
895 + nla_total_size(4) /* IFLA_TXQLEN */
896 + nla_total_size(4) /* IFLA_WEIGHT */
897 + nla_total_size(4) /* IFLA_MTU */
898 + nla_total_size(4) /* IFLA_LINK */
899 + nla_total_size(4) /* IFLA_MASTER */
900 + nla_total_size(1) /* IFLA_CARRIER */
901 + nla_total_size(4) /* IFLA_PROMISCUITY */
902 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
903 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
904 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
905 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
906 + nla_total_size(1) /* IFLA_OPERSTATE */
907 + nla_total_size(1) /* IFLA_LINKMODE */
908 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
909 + nla_total_size(4) /* IFLA_LINK_NETNSID */
910 + nla_total_size(4) /* IFLA_GROUP */
911 + nla_total_size(ext_filter_mask
912 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
913 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
914 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
915 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
916 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
917 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
918 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
919 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
920 + rtnl_xdp_size() /* IFLA_XDP */
921 + nla_total_size(4) /* IFLA_EVENT */
922 + nla_total_size(4) /* IFLA_NEW_NETNSID */
923 + nla_total_size(1) /* IFLA_PROTO_DOWN */
924 + nla_total_size(4) /* IFLA_IF_NETNSID */
925 + 0;
926 }
927
928 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
929 {
930 struct nlattr *vf_ports;
931 struct nlattr *vf_port;
932 int vf;
933 int err;
934
935 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
936 if (!vf_ports)
937 return -EMSGSIZE;
938
939 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
940 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
941 if (!vf_port)
942 goto nla_put_failure;
943 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
944 goto nla_put_failure;
945 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
946 if (err == -EMSGSIZE)
947 goto nla_put_failure;
948 if (err) {
949 nla_nest_cancel(skb, vf_port);
950 continue;
951 }
952 nla_nest_end(skb, vf_port);
953 }
954
955 nla_nest_end(skb, vf_ports);
956
957 return 0;
958
959 nla_put_failure:
960 nla_nest_cancel(skb, vf_ports);
961 return -EMSGSIZE;
962 }
963
964 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
965 {
966 struct nlattr *port_self;
967 int err;
968
969 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
970 if (!port_self)
971 return -EMSGSIZE;
972
973 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
974 if (err) {
975 nla_nest_cancel(skb, port_self);
976 return (err == -EMSGSIZE) ? err : 0;
977 }
978
979 nla_nest_end(skb, port_self);
980
981 return 0;
982 }
983
984 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
985 u32 ext_filter_mask)
986 {
987 int err;
988
989 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
990 !(ext_filter_mask & RTEXT_FILTER_VF))
991 return 0;
992
993 err = rtnl_port_self_fill(skb, dev);
994 if (err)
995 return err;
996
997 if (dev_num_vf(dev->dev.parent)) {
998 err = rtnl_vf_ports_fill(skb, dev);
999 if (err)
1000 return err;
1001 }
1002
1003 return 0;
1004 }
1005
1006 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1007 {
1008 int err;
1009 struct netdev_phys_item_id ppid;
1010
1011 err = dev_get_phys_port_id(dev, &ppid);
1012 if (err) {
1013 if (err == -EOPNOTSUPP)
1014 return 0;
1015 return err;
1016 }
1017
1018 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1019 return -EMSGSIZE;
1020
1021 return 0;
1022 }
1023
1024 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1025 {
1026 char name[IFNAMSIZ];
1027 int err;
1028
1029 err = dev_get_phys_port_name(dev, name, sizeof(name));
1030 if (err) {
1031 if (err == -EOPNOTSUPP)
1032 return 0;
1033 return err;
1034 }
1035
1036 if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1037 return -EMSGSIZE;
1038
1039 return 0;
1040 }
1041
1042 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1043 {
1044 int err;
1045 struct switchdev_attr attr = {
1046 .orig_dev = dev,
1047 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1048 .flags = SWITCHDEV_F_NO_RECURSE,
1049 };
1050
1051 err = switchdev_port_attr_get(dev, &attr);
1052 if (err) {
1053 if (err == -EOPNOTSUPP)
1054 return 0;
1055 return err;
1056 }
1057
1058 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1059 attr.u.ppid.id))
1060 return -EMSGSIZE;
1061
1062 return 0;
1063 }
1064
1065 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1066 struct net_device *dev)
1067 {
1068 struct rtnl_link_stats64 *sp;
1069 struct nlattr *attr;
1070
1071 attr = nla_reserve_64bit(skb, IFLA_STATS64,
1072 sizeof(struct rtnl_link_stats64), IFLA_PAD);
1073 if (!attr)
1074 return -EMSGSIZE;
1075
1076 sp = nla_data(attr);
1077 dev_get_stats(dev, sp);
1078
1079 attr = nla_reserve(skb, IFLA_STATS,
1080 sizeof(struct rtnl_link_stats));
1081 if (!attr)
1082 return -EMSGSIZE;
1083
1084 copy_rtnl_link_stats(nla_data(attr), sp);
1085
1086 return 0;
1087 }
1088
1089 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1090 struct net_device *dev,
1091 int vfs_num,
1092 struct nlattr *vfinfo)
1093 {
1094 struct ifla_vf_rss_query_en vf_rss_query_en;
1095 struct nlattr *vf, *vfstats, *vfvlanlist;
1096 struct ifla_vf_link_state vf_linkstate;
1097 struct ifla_vf_vlan_info vf_vlan_info;
1098 struct ifla_vf_spoofchk vf_spoofchk;
1099 struct ifla_vf_tx_rate vf_tx_rate;
1100 struct ifla_vf_stats vf_stats;
1101 struct ifla_vf_trust vf_trust;
1102 struct ifla_vf_vlan vf_vlan;
1103 struct ifla_vf_rate vf_rate;
1104 struct ifla_vf_mac vf_mac;
1105 struct ifla_vf_info ivi;
1106
1107 memset(&ivi, 0, sizeof(ivi));
1108
1109 /* Not all SR-IOV capable drivers support the
1110 * spoofcheck and "RSS query enable" query. Preset to
1111 * -1 so the user space tool can detect that the driver
1112 * didn't report anything.
1113 */
1114 ivi.spoofchk = -1;
1115 ivi.rss_query_en = -1;
1116 ivi.trusted = -1;
1117 /* The default value for VF link state is "auto"
1118 * IFLA_VF_LINK_STATE_AUTO which equals zero
1119 */
1120 ivi.linkstate = 0;
1121 /* VLAN Protocol by default is 802.1Q */
1122 ivi.vlan_proto = htons(ETH_P_8021Q);
1123 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1124 return 0;
1125
1126 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1127
1128 vf_mac.vf =
1129 vf_vlan.vf =
1130 vf_vlan_info.vf =
1131 vf_rate.vf =
1132 vf_tx_rate.vf =
1133 vf_spoofchk.vf =
1134 vf_linkstate.vf =
1135 vf_rss_query_en.vf =
1136 vf_trust.vf = ivi.vf;
1137
1138 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1139 vf_vlan.vlan = ivi.vlan;
1140 vf_vlan.qos = ivi.qos;
1141 vf_vlan_info.vlan = ivi.vlan;
1142 vf_vlan_info.qos = ivi.qos;
1143 vf_vlan_info.vlan_proto = ivi.vlan_proto;
1144 vf_tx_rate.rate = ivi.max_tx_rate;
1145 vf_rate.min_tx_rate = ivi.min_tx_rate;
1146 vf_rate.max_tx_rate = ivi.max_tx_rate;
1147 vf_spoofchk.setting = ivi.spoofchk;
1148 vf_linkstate.link_state = ivi.linkstate;
1149 vf_rss_query_en.setting = ivi.rss_query_en;
1150 vf_trust.setting = ivi.trusted;
1151 vf = nla_nest_start(skb, IFLA_VF_INFO);
1152 if (!vf)
1153 goto nla_put_vfinfo_failure;
1154 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1155 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1156 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1157 &vf_rate) ||
1158 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1159 &vf_tx_rate) ||
1160 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1161 &vf_spoofchk) ||
1162 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1163 &vf_linkstate) ||
1164 nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1165 sizeof(vf_rss_query_en),
1166 &vf_rss_query_en) ||
1167 nla_put(skb, IFLA_VF_TRUST,
1168 sizeof(vf_trust), &vf_trust))
1169 goto nla_put_vf_failure;
1170 vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST);
1171 if (!vfvlanlist)
1172 goto nla_put_vf_failure;
1173 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1174 &vf_vlan_info)) {
1175 nla_nest_cancel(skb, vfvlanlist);
1176 goto nla_put_vf_failure;
1177 }
1178 nla_nest_end(skb, vfvlanlist);
1179 memset(&vf_stats, 0, sizeof(vf_stats));
1180 if (dev->netdev_ops->ndo_get_vf_stats)
1181 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1182 &vf_stats);
1183 vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1184 if (!vfstats)
1185 goto nla_put_vf_failure;
1186 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1187 vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1188 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1189 vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1190 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1191 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1192 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1193 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1194 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1195 vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1196 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1197 vf_stats.multicast, IFLA_VF_STATS_PAD)) {
1198 nla_nest_cancel(skb, vfstats);
1199 goto nla_put_vf_failure;
1200 }
1201 nla_nest_end(skb, vfstats);
1202 nla_nest_end(skb, vf);
1203 return 0;
1204
1205 nla_put_vf_failure:
1206 nla_nest_cancel(skb, vf);
1207 nla_put_vfinfo_failure:
1208 nla_nest_cancel(skb, vfinfo);
1209 return -EMSGSIZE;
1210 }
1211
1212 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1213 struct net_device *dev,
1214 u32 ext_filter_mask)
1215 {
1216 struct nlattr *vfinfo;
1217 int i, num_vfs;
1218
1219 if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1220 return 0;
1221
1222 num_vfs = dev_num_vf(dev->dev.parent);
1223 if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1224 return -EMSGSIZE;
1225
1226 if (!dev->netdev_ops->ndo_get_vf_config)
1227 return 0;
1228
1229 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1230 if (!vfinfo)
1231 return -EMSGSIZE;
1232
1233 for (i = 0; i < num_vfs; i++) {
1234 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1235 return -EMSGSIZE;
1236 }
1237
1238 nla_nest_end(skb, vfinfo);
1239 return 0;
1240 }
1241
1242 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1243 {
1244 struct rtnl_link_ifmap map;
1245
1246 memset(&map, 0, sizeof(map));
1247 map.mem_start = dev->mem_start;
1248 map.mem_end = dev->mem_end;
1249 map.base_addr = dev->base_addr;
1250 map.irq = dev->irq;
1251 map.dma = dev->dma;
1252 map.port = dev->if_port;
1253
1254 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1255 return -EMSGSIZE;
1256
1257 return 0;
1258 }
1259
1260 static u8 rtnl_xdp_attached_mode(struct net_device *dev, u32 *prog_id)
1261 {
1262 const struct net_device_ops *ops = dev->netdev_ops;
1263 const struct bpf_prog *generic_xdp_prog;
1264
1265 ASSERT_RTNL();
1266
1267 *prog_id = 0;
1268 generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1269 if (generic_xdp_prog) {
1270 *prog_id = generic_xdp_prog->aux->id;
1271 return XDP_ATTACHED_SKB;
1272 }
1273 if (!ops->ndo_bpf)
1274 return XDP_ATTACHED_NONE;
1275
1276 return __dev_xdp_attached(dev, ops->ndo_bpf, prog_id);
1277 }
1278
1279 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1280 {
1281 struct nlattr *xdp;
1282 u32 prog_id;
1283 int err;
1284
1285 xdp = nla_nest_start(skb, IFLA_XDP);
1286 if (!xdp)
1287 return -EMSGSIZE;
1288
1289 err = nla_put_u8(skb, IFLA_XDP_ATTACHED,
1290 rtnl_xdp_attached_mode(dev, &prog_id));
1291 if (err)
1292 goto err_cancel;
1293
1294 if (prog_id) {
1295 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1296 if (err)
1297 goto err_cancel;
1298 }
1299
1300 nla_nest_end(skb, xdp);
1301 return 0;
1302
1303 err_cancel:
1304 nla_nest_cancel(skb, xdp);
1305 return err;
1306 }
1307
1308 static u32 rtnl_get_event(unsigned long event)
1309 {
1310 u32 rtnl_event_type = IFLA_EVENT_NONE;
1311
1312 switch (event) {
1313 case NETDEV_REBOOT:
1314 rtnl_event_type = IFLA_EVENT_REBOOT;
1315 break;
1316 case NETDEV_FEAT_CHANGE:
1317 rtnl_event_type = IFLA_EVENT_FEATURES;
1318 break;
1319 case NETDEV_BONDING_FAILOVER:
1320 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1321 break;
1322 case NETDEV_NOTIFY_PEERS:
1323 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1324 break;
1325 case NETDEV_RESEND_IGMP:
1326 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1327 break;
1328 case NETDEV_CHANGEINFODATA:
1329 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1330 break;
1331 default:
1332 break;
1333 }
1334
1335 return rtnl_event_type;
1336 }
1337
1338 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1339 {
1340 const struct net_device *upper_dev;
1341 int ret = 0;
1342
1343 rcu_read_lock();
1344
1345 upper_dev = netdev_master_upper_dev_get_rcu(dev);
1346 if (upper_dev)
1347 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1348
1349 rcu_read_unlock();
1350 return ret;
1351 }
1352
1353 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev)
1354 {
1355 int ifindex = dev_get_iflink(dev);
1356
1357 if (dev->ifindex == ifindex)
1358 return 0;
1359
1360 return nla_put_u32(skb, IFLA_LINK, ifindex);
1361 }
1362
1363 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1364 struct net_device *dev)
1365 {
1366 char buf[IFALIASZ];
1367 int ret;
1368
1369 ret = dev_get_alias(dev, buf, sizeof(buf));
1370 return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1371 }
1372
1373 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1374 const struct net_device *dev,
1375 struct net *src_net)
1376 {
1377 if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1378 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1379
1380 if (!net_eq(dev_net(dev), link_net)) {
1381 int id = peernet2id_alloc(src_net, link_net);
1382
1383 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1384 return -EMSGSIZE;
1385 }
1386 }
1387
1388 return 0;
1389 }
1390
1391 static int rtnl_fill_link_af(struct sk_buff *skb,
1392 const struct net_device *dev,
1393 u32 ext_filter_mask)
1394 {
1395 const struct rtnl_af_ops *af_ops;
1396 struct nlattr *af_spec;
1397
1398 af_spec = nla_nest_start(skb, IFLA_AF_SPEC);
1399 if (!af_spec)
1400 return -EMSGSIZE;
1401
1402 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1403 struct nlattr *af;
1404 int err;
1405
1406 if (!af_ops->fill_link_af)
1407 continue;
1408
1409 af = nla_nest_start(skb, af_ops->family);
1410 if (!af)
1411 return -EMSGSIZE;
1412
1413 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1414 /*
1415 * Caller may return ENODATA to indicate that there
1416 * was no data to be dumped. This is not an error, it
1417 * means we should trim the attribute header and
1418 * continue.
1419 */
1420 if (err == -ENODATA)
1421 nla_nest_cancel(skb, af);
1422 else if (err < 0)
1423 return -EMSGSIZE;
1424
1425 nla_nest_end(skb, af);
1426 }
1427
1428 nla_nest_end(skb, af_spec);
1429 return 0;
1430 }
1431
1432 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1433 struct net_device *dev, struct net *src_net,
1434 int type, u32 pid, u32 seq, u32 change,
1435 unsigned int flags, u32 ext_filter_mask,
1436 u32 event, int *new_nsid, int tgt_netnsid)
1437 {
1438 struct ifinfomsg *ifm;
1439 struct nlmsghdr *nlh;
1440
1441 ASSERT_RTNL();
1442 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1443 if (nlh == NULL)
1444 return -EMSGSIZE;
1445
1446 ifm = nlmsg_data(nlh);
1447 ifm->ifi_family = AF_UNSPEC;
1448 ifm->__ifi_pad = 0;
1449 ifm->ifi_type = dev->type;
1450 ifm->ifi_index = dev->ifindex;
1451 ifm->ifi_flags = dev_get_flags(dev);
1452 ifm->ifi_change = change;
1453
1454 if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_IF_NETNSID, tgt_netnsid))
1455 goto nla_put_failure;
1456
1457 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1458 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1459 nla_put_u8(skb, IFLA_OPERSTATE,
1460 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1461 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1462 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1463 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1464 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1465 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1466 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1467 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1468 #ifdef CONFIG_RPS
1469 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1470 #endif
1471 nla_put_iflink(skb, dev) ||
1472 put_master_ifindex(skb, dev) ||
1473 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1474 (dev->qdisc &&
1475 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1476 nla_put_ifalias(skb, dev) ||
1477 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1478 atomic_read(&dev->carrier_changes)) ||
1479 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1480 goto nla_put_failure;
1481
1482 if (event != IFLA_EVENT_NONE) {
1483 if (nla_put_u32(skb, IFLA_EVENT, event))
1484 goto nla_put_failure;
1485 }
1486
1487 if (rtnl_fill_link_ifmap(skb, dev))
1488 goto nla_put_failure;
1489
1490 if (dev->addr_len) {
1491 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1492 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1493 goto nla_put_failure;
1494 }
1495
1496 if (rtnl_phys_port_id_fill(skb, dev))
1497 goto nla_put_failure;
1498
1499 if (rtnl_phys_port_name_fill(skb, dev))
1500 goto nla_put_failure;
1501
1502 if (rtnl_phys_switch_id_fill(skb, dev))
1503 goto nla_put_failure;
1504
1505 if (rtnl_fill_stats(skb, dev))
1506 goto nla_put_failure;
1507
1508 if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1509 goto nla_put_failure;
1510
1511 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1512 goto nla_put_failure;
1513
1514 if (rtnl_xdp_fill(skb, dev))
1515 goto nla_put_failure;
1516
1517 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1518 if (rtnl_link_fill(skb, dev) < 0)
1519 goto nla_put_failure;
1520 }
1521
1522 if (rtnl_fill_link_netnsid(skb, dev, src_net))
1523 goto nla_put_failure;
1524
1525 if (new_nsid &&
1526 nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1527 goto nla_put_failure;
1528
1529 rcu_read_lock();
1530 if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1531 goto nla_put_failure_rcu;
1532 rcu_read_unlock();
1533
1534 nlmsg_end(skb, nlh);
1535 return 0;
1536
1537 nla_put_failure_rcu:
1538 rcu_read_unlock();
1539 nla_put_failure:
1540 nlmsg_cancel(skb, nlh);
1541 return -EMSGSIZE;
1542 }
1543
1544 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1545 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1546 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1547 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1548 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1549 [IFLA_MTU] = { .type = NLA_U32 },
1550 [IFLA_LINK] = { .type = NLA_U32 },
1551 [IFLA_MASTER] = { .type = NLA_U32 },
1552 [IFLA_CARRIER] = { .type = NLA_U8 },
1553 [IFLA_TXQLEN] = { .type = NLA_U32 },
1554 [IFLA_WEIGHT] = { .type = NLA_U32 },
1555 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1556 [IFLA_LINKMODE] = { .type = NLA_U8 },
1557 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1558 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1559 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1560 /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1561 * allow 0-length string (needed to remove an alias).
1562 */
1563 [IFLA_IFALIAS] = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1564 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1565 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1566 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1567 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1568 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1569 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1570 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1571 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1572 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1573 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1574 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1575 [IFLA_LINK_NETNSID] = { .type = NLA_S32 },
1576 [IFLA_PROTO_DOWN] = { .type = NLA_U8 },
1577 [IFLA_XDP] = { .type = NLA_NESTED },
1578 [IFLA_EVENT] = { .type = NLA_U32 },
1579 [IFLA_GROUP] = { .type = NLA_U32 },
1580 [IFLA_IF_NETNSID] = { .type = NLA_S32 },
1581 };
1582
1583 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1584 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1585 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1586 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1587 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1588 };
1589
1590 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1591 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
1592 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
1593 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED },
1594 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
1595 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
1596 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) },
1597 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) },
1598 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) },
1599 [IFLA_VF_STATS] = { .type = NLA_NESTED },
1600 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) },
1601 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) },
1602 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) },
1603 };
1604
1605 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1606 [IFLA_PORT_VF] = { .type = NLA_U32 },
1607 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1608 .len = PORT_PROFILE_MAX },
1609 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1610 .len = PORT_UUID_MAX },
1611 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1612 .len = PORT_UUID_MAX },
1613 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1614 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1615
1616 /* Unused, but we need to keep it here since user space could
1617 * fill it. It's also broken with regard to NLA_BINARY use in
1618 * combination with structs.
1619 */
1620 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1621 .len = sizeof(struct ifla_port_vsi) },
1622 };
1623
1624 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1625 [IFLA_XDP_FD] = { .type = NLA_S32 },
1626 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 },
1627 [IFLA_XDP_FLAGS] = { .type = NLA_U32 },
1628 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 },
1629 };
1630
1631 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1632 {
1633 const struct rtnl_link_ops *ops = NULL;
1634 struct nlattr *linfo[IFLA_INFO_MAX + 1];
1635
1636 if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla,
1637 ifla_info_policy, NULL) < 0)
1638 return NULL;
1639
1640 if (linfo[IFLA_INFO_KIND]) {
1641 char kind[MODULE_NAME_LEN];
1642
1643 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1644 ops = rtnl_link_ops_get(kind);
1645 }
1646
1647 return ops;
1648 }
1649
1650 static bool link_master_filtered(struct net_device *dev, int master_idx)
1651 {
1652 struct net_device *master;
1653
1654 if (!master_idx)
1655 return false;
1656
1657 master = netdev_master_upper_dev_get(dev);
1658 if (!master || master->ifindex != master_idx)
1659 return true;
1660
1661 return false;
1662 }
1663
1664 static bool link_kind_filtered(const struct net_device *dev,
1665 const struct rtnl_link_ops *kind_ops)
1666 {
1667 if (kind_ops && dev->rtnl_link_ops != kind_ops)
1668 return true;
1669
1670 return false;
1671 }
1672
1673 static bool link_dump_filtered(struct net_device *dev,
1674 int master_idx,
1675 const struct rtnl_link_ops *kind_ops)
1676 {
1677 if (link_master_filtered(dev, master_idx) ||
1678 link_kind_filtered(dev, kind_ops))
1679 return true;
1680
1681 return false;
1682 }
1683
1684 static struct net *get_target_net(struct sock *sk, int netnsid)
1685 {
1686 struct net *net;
1687
1688 net = get_net_ns_by_id(sock_net(sk), netnsid);
1689 if (!net)
1690 return ERR_PTR(-EINVAL);
1691
1692 /* For now, the caller is required to have CAP_NET_ADMIN in
1693 * the user namespace owning the target net ns.
1694 */
1695 if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
1696 put_net(net);
1697 return ERR_PTR(-EACCES);
1698 }
1699 return net;
1700 }
1701
1702 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1703 {
1704 struct net *net = sock_net(skb->sk);
1705 struct net *tgt_net = net;
1706 int h, s_h;
1707 int idx = 0, s_idx;
1708 struct net_device *dev;
1709 struct hlist_head *head;
1710 struct nlattr *tb[IFLA_MAX+1];
1711 u32 ext_filter_mask = 0;
1712 const struct rtnl_link_ops *kind_ops = NULL;
1713 unsigned int flags = NLM_F_MULTI;
1714 int master_idx = 0;
1715 int netnsid = -1;
1716 int err;
1717 int hdrlen;
1718
1719 s_h = cb->args[0];
1720 s_idx = cb->args[1];
1721
1722 /* A hack to preserve kernel<->userspace interface.
1723 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1724 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1725 * what iproute2 < v3.9.0 used.
1726 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1727 * attribute, its netlink message is shorter than struct ifinfomsg.
1728 */
1729 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1730 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1731
1732 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX,
1733 ifla_policy, NULL) >= 0) {
1734 if (tb[IFLA_IF_NETNSID]) {
1735 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
1736 tgt_net = get_target_net(skb->sk, netnsid);
1737 if (IS_ERR(tgt_net)) {
1738 tgt_net = net;
1739 netnsid = -1;
1740 }
1741 }
1742
1743 if (tb[IFLA_EXT_MASK])
1744 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1745
1746 if (tb[IFLA_MASTER])
1747 master_idx = nla_get_u32(tb[IFLA_MASTER]);
1748
1749 if (tb[IFLA_LINKINFO])
1750 kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1751
1752 if (master_idx || kind_ops)
1753 flags |= NLM_F_DUMP_FILTERED;
1754 }
1755
1756 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1757 idx = 0;
1758 head = &tgt_net->dev_index_head[h];
1759 hlist_for_each_entry(dev, head, index_hlist) {
1760 if (link_dump_filtered(dev, master_idx, kind_ops))
1761 goto cont;
1762 if (idx < s_idx)
1763 goto cont;
1764 err = rtnl_fill_ifinfo(skb, dev, net,
1765 RTM_NEWLINK,
1766 NETLINK_CB(cb->skb).portid,
1767 cb->nlh->nlmsg_seq, 0,
1768 flags,
1769 ext_filter_mask, 0, NULL,
1770 netnsid);
1771
1772 if (err < 0) {
1773 if (likely(skb->len))
1774 goto out;
1775
1776 goto out_err;
1777 }
1778 cont:
1779 idx++;
1780 }
1781 }
1782 out:
1783 err = skb->len;
1784 out_err:
1785 cb->args[1] = idx;
1786 cb->args[0] = h;
1787 cb->seq = net->dev_base_seq;
1788 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1789 if (netnsid >= 0)
1790 put_net(tgt_net);
1791
1792 return err;
1793 }
1794
1795 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
1796 struct netlink_ext_ack *exterr)
1797 {
1798 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy, exterr);
1799 }
1800 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1801
1802 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1803 {
1804 struct net *net;
1805 /* Examine the link attributes and figure out which
1806 * network namespace we are talking about.
1807 */
1808 if (tb[IFLA_NET_NS_PID])
1809 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1810 else if (tb[IFLA_NET_NS_FD])
1811 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1812 else
1813 net = get_net(src_net);
1814 return net;
1815 }
1816 EXPORT_SYMBOL(rtnl_link_get_net);
1817
1818 /* Figure out which network namespace we are talking about by
1819 * examining the link attributes in the following order:
1820 *
1821 * 1. IFLA_NET_NS_PID
1822 * 2. IFLA_NET_NS_FD
1823 * 3. IFLA_IF_NETNSID
1824 */
1825 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
1826 struct nlattr *tb[])
1827 {
1828 struct net *net;
1829
1830 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
1831 return rtnl_link_get_net(src_net, tb);
1832
1833 if (!tb[IFLA_IF_NETNSID])
1834 return get_net(src_net);
1835
1836 net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_IF_NETNSID]));
1837 if (!net)
1838 return ERR_PTR(-EINVAL);
1839
1840 return net;
1841 }
1842
1843 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
1844 struct net *src_net,
1845 struct nlattr *tb[], int cap)
1846 {
1847 struct net *net;
1848
1849 net = rtnl_link_get_net_by_nlattr(src_net, tb);
1850 if (IS_ERR(net))
1851 return net;
1852
1853 if (!netlink_ns_capable(skb, net->user_ns, cap)) {
1854 put_net(net);
1855 return ERR_PTR(-EPERM);
1856 }
1857
1858 return net;
1859 }
1860
1861 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1862 {
1863 if (dev) {
1864 if (tb[IFLA_ADDRESS] &&
1865 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1866 return -EINVAL;
1867
1868 if (tb[IFLA_BROADCAST] &&
1869 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1870 return -EINVAL;
1871 }
1872
1873 if (tb[IFLA_AF_SPEC]) {
1874 struct nlattr *af;
1875 int rem, err;
1876
1877 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1878 const struct rtnl_af_ops *af_ops;
1879
1880 rcu_read_lock();
1881 af_ops = rtnl_af_lookup(nla_type(af));
1882 if (!af_ops) {
1883 rcu_read_unlock();
1884 return -EAFNOSUPPORT;
1885 }
1886
1887 if (!af_ops->set_link_af) {
1888 rcu_read_unlock();
1889 return -EOPNOTSUPP;
1890 }
1891
1892 if (af_ops->validate_link_af) {
1893 err = af_ops->validate_link_af(dev, af);
1894 if (err < 0) {
1895 rcu_read_unlock();
1896 return err;
1897 }
1898 }
1899
1900 rcu_read_unlock();
1901 }
1902 }
1903
1904 return 0;
1905 }
1906
1907 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
1908 int guid_type)
1909 {
1910 const struct net_device_ops *ops = dev->netdev_ops;
1911
1912 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
1913 }
1914
1915 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
1916 {
1917 if (dev->type != ARPHRD_INFINIBAND)
1918 return -EOPNOTSUPP;
1919
1920 return handle_infiniband_guid(dev, ivt, guid_type);
1921 }
1922
1923 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1924 {
1925 const struct net_device_ops *ops = dev->netdev_ops;
1926 int err = -EINVAL;
1927
1928 if (tb[IFLA_VF_MAC]) {
1929 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1930
1931 err = -EOPNOTSUPP;
1932 if (ops->ndo_set_vf_mac)
1933 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1934 ivm->mac);
1935 if (err < 0)
1936 return err;
1937 }
1938
1939 if (tb[IFLA_VF_VLAN]) {
1940 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1941
1942 err = -EOPNOTSUPP;
1943 if (ops->ndo_set_vf_vlan)
1944 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1945 ivv->qos,
1946 htons(ETH_P_8021Q));
1947 if (err < 0)
1948 return err;
1949 }
1950
1951 if (tb[IFLA_VF_VLAN_LIST]) {
1952 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
1953 struct nlattr *attr;
1954 int rem, len = 0;
1955
1956 err = -EOPNOTSUPP;
1957 if (!ops->ndo_set_vf_vlan)
1958 return err;
1959
1960 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
1961 if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
1962 nla_len(attr) < NLA_HDRLEN) {
1963 return -EINVAL;
1964 }
1965 if (len >= MAX_VLAN_LIST_LEN)
1966 return -EOPNOTSUPP;
1967 ivvl[len] = nla_data(attr);
1968
1969 len++;
1970 }
1971 if (len == 0)
1972 return -EINVAL;
1973
1974 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
1975 ivvl[0]->qos, ivvl[0]->vlan_proto);
1976 if (err < 0)
1977 return err;
1978 }
1979
1980 if (tb[IFLA_VF_TX_RATE]) {
1981 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1982 struct ifla_vf_info ivf;
1983
1984 err = -EOPNOTSUPP;
1985 if (ops->ndo_get_vf_config)
1986 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1987 if (err < 0)
1988 return err;
1989
1990 err = -EOPNOTSUPP;
1991 if (ops->ndo_set_vf_rate)
1992 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1993 ivf.min_tx_rate,
1994 ivt->rate);
1995 if (err < 0)
1996 return err;
1997 }
1998
1999 if (tb[IFLA_VF_RATE]) {
2000 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2001
2002 err = -EOPNOTSUPP;
2003 if (ops->ndo_set_vf_rate)
2004 err = ops->ndo_set_vf_rate(dev, ivt->vf,
2005 ivt->min_tx_rate,
2006 ivt->max_tx_rate);
2007 if (err < 0)
2008 return err;
2009 }
2010
2011 if (tb[IFLA_VF_SPOOFCHK]) {
2012 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2013
2014 err = -EOPNOTSUPP;
2015 if (ops->ndo_set_vf_spoofchk)
2016 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2017 ivs->setting);
2018 if (err < 0)
2019 return err;
2020 }
2021
2022 if (tb[IFLA_VF_LINK_STATE]) {
2023 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2024
2025 err = -EOPNOTSUPP;
2026 if (ops->ndo_set_vf_link_state)
2027 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2028 ivl->link_state);
2029 if (err < 0)
2030 return err;
2031 }
2032
2033 if (tb[IFLA_VF_RSS_QUERY_EN]) {
2034 struct ifla_vf_rss_query_en *ivrssq_en;
2035
2036 err = -EOPNOTSUPP;
2037 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2038 if (ops->ndo_set_vf_rss_query_en)
2039 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2040 ivrssq_en->setting);
2041 if (err < 0)
2042 return err;
2043 }
2044
2045 if (tb[IFLA_VF_TRUST]) {
2046 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2047
2048 err = -EOPNOTSUPP;
2049 if (ops->ndo_set_vf_trust)
2050 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2051 if (err < 0)
2052 return err;
2053 }
2054
2055 if (tb[IFLA_VF_IB_NODE_GUID]) {
2056 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2057
2058 if (!ops->ndo_set_vf_guid)
2059 return -EOPNOTSUPP;
2060
2061 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2062 }
2063
2064 if (tb[IFLA_VF_IB_PORT_GUID]) {
2065 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2066
2067 if (!ops->ndo_set_vf_guid)
2068 return -EOPNOTSUPP;
2069
2070 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2071 }
2072
2073 return err;
2074 }
2075
2076 static int do_set_master(struct net_device *dev, int ifindex,
2077 struct netlink_ext_ack *extack)
2078 {
2079 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2080 const struct net_device_ops *ops;
2081 int err;
2082
2083 if (upper_dev) {
2084 if (upper_dev->ifindex == ifindex)
2085 return 0;
2086 ops = upper_dev->netdev_ops;
2087 if (ops->ndo_del_slave) {
2088 err = ops->ndo_del_slave(upper_dev, dev);
2089 if (err)
2090 return err;
2091 } else {
2092 return -EOPNOTSUPP;
2093 }
2094 }
2095
2096 if (ifindex) {
2097 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2098 if (!upper_dev)
2099 return -EINVAL;
2100 ops = upper_dev->netdev_ops;
2101 if (ops->ndo_add_slave) {
2102 err = ops->ndo_add_slave(upper_dev, dev, extack);
2103 if (err)
2104 return err;
2105 } else {
2106 return -EOPNOTSUPP;
2107 }
2108 }
2109 return 0;
2110 }
2111
2112 #define DO_SETLINK_MODIFIED 0x01
2113 /* notify flag means notify + modified. */
2114 #define DO_SETLINK_NOTIFY 0x03
2115 static int do_setlink(const struct sk_buff *skb,
2116 struct net_device *dev, struct ifinfomsg *ifm,
2117 struct netlink_ext_ack *extack,
2118 struct nlattr **tb, char *ifname, int status)
2119 {
2120 const struct net_device_ops *ops = dev->netdev_ops;
2121 int err;
2122
2123 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_IF_NETNSID]) {
2124 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev),
2125 tb, CAP_NET_ADMIN);
2126 if (IS_ERR(net)) {
2127 err = PTR_ERR(net);
2128 goto errout;
2129 }
2130
2131 err = dev_change_net_namespace(dev, net, ifname);
2132 put_net(net);
2133 if (err)
2134 goto errout;
2135 status |= DO_SETLINK_MODIFIED;
2136 }
2137
2138 if (tb[IFLA_MAP]) {
2139 struct rtnl_link_ifmap *u_map;
2140 struct ifmap k_map;
2141
2142 if (!ops->ndo_set_config) {
2143 err = -EOPNOTSUPP;
2144 goto errout;
2145 }
2146
2147 if (!netif_device_present(dev)) {
2148 err = -ENODEV;
2149 goto errout;
2150 }
2151
2152 u_map = nla_data(tb[IFLA_MAP]);
2153 k_map.mem_start = (unsigned long) u_map->mem_start;
2154 k_map.mem_end = (unsigned long) u_map->mem_end;
2155 k_map.base_addr = (unsigned short) u_map->base_addr;
2156 k_map.irq = (unsigned char) u_map->irq;
2157 k_map.dma = (unsigned char) u_map->dma;
2158 k_map.port = (unsigned char) u_map->port;
2159
2160 err = ops->ndo_set_config(dev, &k_map);
2161 if (err < 0)
2162 goto errout;
2163
2164 status |= DO_SETLINK_NOTIFY;
2165 }
2166
2167 if (tb[IFLA_ADDRESS]) {
2168 struct sockaddr *sa;
2169 int len;
2170
2171 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2172 sizeof(*sa));
2173 sa = kmalloc(len, GFP_KERNEL);
2174 if (!sa) {
2175 err = -ENOMEM;
2176 goto errout;
2177 }
2178 sa->sa_family = dev->type;
2179 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2180 dev->addr_len);
2181 err = dev_set_mac_address(dev, sa);
2182 kfree(sa);
2183 if (err)
2184 goto errout;
2185 status |= DO_SETLINK_MODIFIED;
2186 }
2187
2188 if (tb[IFLA_MTU]) {
2189 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2190 if (err < 0)
2191 goto errout;
2192 status |= DO_SETLINK_MODIFIED;
2193 }
2194
2195 if (tb[IFLA_GROUP]) {
2196 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2197 status |= DO_SETLINK_NOTIFY;
2198 }
2199
2200 /*
2201 * Interface selected by interface index but interface
2202 * name provided implies that a name change has been
2203 * requested.
2204 */
2205 if (ifm->ifi_index > 0 && ifname[0]) {
2206 err = dev_change_name(dev, ifname);
2207 if (err < 0)
2208 goto errout;
2209 status |= DO_SETLINK_MODIFIED;
2210 }
2211
2212 if (tb[IFLA_IFALIAS]) {
2213 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2214 nla_len(tb[IFLA_IFALIAS]));
2215 if (err < 0)
2216 goto errout;
2217 status |= DO_SETLINK_NOTIFY;
2218 }
2219
2220 if (tb[IFLA_BROADCAST]) {
2221 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2222 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2223 }
2224
2225 if (ifm->ifi_flags || ifm->ifi_change) {
2226 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2227 if (err < 0)
2228 goto errout;
2229 }
2230
2231 if (tb[IFLA_MASTER]) {
2232 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2233 if (err)
2234 goto errout;
2235 status |= DO_SETLINK_MODIFIED;
2236 }
2237
2238 if (tb[IFLA_CARRIER]) {
2239 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2240 if (err)
2241 goto errout;
2242 status |= DO_SETLINK_MODIFIED;
2243 }
2244
2245 if (tb[IFLA_TXQLEN]) {
2246 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2247 unsigned int orig_len = dev->tx_queue_len;
2248
2249 if (dev->tx_queue_len ^ value) {
2250 dev->tx_queue_len = value;
2251 err = call_netdevice_notifiers(
2252 NETDEV_CHANGE_TX_QUEUE_LEN, dev);
2253 err = notifier_to_errno(err);
2254 if (err) {
2255 dev->tx_queue_len = orig_len;
2256 goto errout;
2257 }
2258 status |= DO_SETLINK_MODIFIED;
2259 }
2260 }
2261
2262 if (tb[IFLA_OPERSTATE])
2263 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2264
2265 if (tb[IFLA_LINKMODE]) {
2266 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2267
2268 write_lock_bh(&dev_base_lock);
2269 if (dev->link_mode ^ value)
2270 status |= DO_SETLINK_NOTIFY;
2271 dev->link_mode = value;
2272 write_unlock_bh(&dev_base_lock);
2273 }
2274
2275 if (tb[IFLA_VFINFO_LIST]) {
2276 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2277 struct nlattr *attr;
2278 int rem;
2279
2280 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2281 if (nla_type(attr) != IFLA_VF_INFO ||
2282 nla_len(attr) < NLA_HDRLEN) {
2283 err = -EINVAL;
2284 goto errout;
2285 }
2286 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2287 ifla_vf_policy, NULL);
2288 if (err < 0)
2289 goto errout;
2290 err = do_setvfinfo(dev, vfinfo);
2291 if (err < 0)
2292 goto errout;
2293 status |= DO_SETLINK_NOTIFY;
2294 }
2295 }
2296 err = 0;
2297
2298 if (tb[IFLA_VF_PORTS]) {
2299 struct nlattr *port[IFLA_PORT_MAX+1];
2300 struct nlattr *attr;
2301 int vf;
2302 int rem;
2303
2304 err = -EOPNOTSUPP;
2305 if (!ops->ndo_set_vf_port)
2306 goto errout;
2307
2308 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2309 if (nla_type(attr) != IFLA_VF_PORT ||
2310 nla_len(attr) < NLA_HDRLEN) {
2311 err = -EINVAL;
2312 goto errout;
2313 }
2314 err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2315 ifla_port_policy, NULL);
2316 if (err < 0)
2317 goto errout;
2318 if (!port[IFLA_PORT_VF]) {
2319 err = -EOPNOTSUPP;
2320 goto errout;
2321 }
2322 vf = nla_get_u32(port[IFLA_PORT_VF]);
2323 err = ops->ndo_set_vf_port(dev, vf, port);
2324 if (err < 0)
2325 goto errout;
2326 status |= DO_SETLINK_NOTIFY;
2327 }
2328 }
2329 err = 0;
2330
2331 if (tb[IFLA_PORT_SELF]) {
2332 struct nlattr *port[IFLA_PORT_MAX+1];
2333
2334 err = nla_parse_nested(port, IFLA_PORT_MAX,
2335 tb[IFLA_PORT_SELF], ifla_port_policy,
2336 NULL);
2337 if (err < 0)
2338 goto errout;
2339
2340 err = -EOPNOTSUPP;
2341 if (ops->ndo_set_vf_port)
2342 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2343 if (err < 0)
2344 goto errout;
2345 status |= DO_SETLINK_NOTIFY;
2346 }
2347
2348 if (tb[IFLA_AF_SPEC]) {
2349 struct nlattr *af;
2350 int rem;
2351
2352 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2353 const struct rtnl_af_ops *af_ops;
2354
2355 rcu_read_lock();
2356
2357 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2358
2359 err = af_ops->set_link_af(dev, af);
2360 if (err < 0) {
2361 rcu_read_unlock();
2362 goto errout;
2363 }
2364
2365 rcu_read_unlock();
2366 status |= DO_SETLINK_NOTIFY;
2367 }
2368 }
2369 err = 0;
2370
2371 if (tb[IFLA_PROTO_DOWN]) {
2372 err = dev_change_proto_down(dev,
2373 nla_get_u8(tb[IFLA_PROTO_DOWN]));
2374 if (err)
2375 goto errout;
2376 status |= DO_SETLINK_NOTIFY;
2377 }
2378
2379 if (tb[IFLA_XDP]) {
2380 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2381 u32 xdp_flags = 0;
2382
2383 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2384 ifla_xdp_policy, NULL);
2385 if (err < 0)
2386 goto errout;
2387
2388 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2389 err = -EINVAL;
2390 goto errout;
2391 }
2392
2393 if (xdp[IFLA_XDP_FLAGS]) {
2394 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2395 if (xdp_flags & ~XDP_FLAGS_MASK) {
2396 err = -EINVAL;
2397 goto errout;
2398 }
2399 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2400 err = -EINVAL;
2401 goto errout;
2402 }
2403 }
2404
2405 if (xdp[IFLA_XDP_FD]) {
2406 err = dev_change_xdp_fd(dev, extack,
2407 nla_get_s32(xdp[IFLA_XDP_FD]),
2408 xdp_flags);
2409 if (err)
2410 goto errout;
2411 status |= DO_SETLINK_NOTIFY;
2412 }
2413 }
2414
2415 errout:
2416 if (status & DO_SETLINK_MODIFIED) {
2417 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2418 netdev_state_change(dev);
2419
2420 if (err < 0)
2421 net_warn_ratelimited("A link change request failed with some changes committed already. Interface %s may have been left with an inconsistent configuration, please check.\n",
2422 dev->name);
2423 }
2424
2425 return err;
2426 }
2427
2428 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2429 struct netlink_ext_ack *extack)
2430 {
2431 struct net *net = sock_net(skb->sk);
2432 struct ifinfomsg *ifm;
2433 struct net_device *dev;
2434 int err;
2435 struct nlattr *tb[IFLA_MAX+1];
2436 char ifname[IFNAMSIZ];
2437
2438 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy,
2439 extack);
2440 if (err < 0)
2441 goto errout;
2442
2443 if (tb[IFLA_IFNAME])
2444 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2445 else
2446 ifname[0] = '\0';
2447
2448 err = -EINVAL;
2449 ifm = nlmsg_data(nlh);
2450 if (ifm->ifi_index > 0)
2451 dev = __dev_get_by_index(net, ifm->ifi_index);
2452 else if (tb[IFLA_IFNAME])
2453 dev = __dev_get_by_name(net, ifname);
2454 else
2455 goto errout;
2456
2457 if (dev == NULL) {
2458 err = -ENODEV;
2459 goto errout;
2460 }
2461
2462 err = validate_linkmsg(dev, tb);
2463 if (err < 0)
2464 goto errout;
2465
2466 err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2467 errout:
2468 return err;
2469 }
2470
2471 static int rtnl_group_dellink(const struct net *net, int group)
2472 {
2473 struct net_device *dev, *aux;
2474 LIST_HEAD(list_kill);
2475 bool found = false;
2476
2477 if (!group)
2478 return -EPERM;
2479
2480 for_each_netdev(net, dev) {
2481 if (dev->group == group) {
2482 const struct rtnl_link_ops *ops;
2483
2484 found = true;
2485 ops = dev->rtnl_link_ops;
2486 if (!ops || !ops->dellink)
2487 return -EOPNOTSUPP;
2488 }
2489 }
2490
2491 if (!found)
2492 return -ENODEV;
2493
2494 for_each_netdev_safe(net, dev, aux) {
2495 if (dev->group == group) {
2496 const struct rtnl_link_ops *ops;
2497
2498 ops = dev->rtnl_link_ops;
2499 ops->dellink(dev, &list_kill);
2500 }
2501 }
2502 unregister_netdevice_many(&list_kill);
2503
2504 return 0;
2505 }
2506
2507 int rtnl_delete_link(struct net_device *dev)
2508 {
2509 const struct rtnl_link_ops *ops;
2510 LIST_HEAD(list_kill);
2511
2512 ops = dev->rtnl_link_ops;
2513 if (!ops || !ops->dellink)
2514 return -EOPNOTSUPP;
2515
2516 ops->dellink(dev, &list_kill);
2517 unregister_netdevice_many(&list_kill);
2518
2519 return 0;
2520 }
2521 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2522
2523 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2524 struct netlink_ext_ack *extack)
2525 {
2526 struct net *net = sock_net(skb->sk);
2527 struct net_device *dev;
2528 struct ifinfomsg *ifm;
2529 char ifname[IFNAMSIZ];
2530 struct nlattr *tb[IFLA_MAX+1];
2531 int err;
2532
2533 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2534 if (err < 0)
2535 return err;
2536
2537 if (tb[IFLA_IF_NETNSID])
2538 return -EOPNOTSUPP;
2539
2540 if (tb[IFLA_IFNAME])
2541 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2542
2543 ifm = nlmsg_data(nlh);
2544 if (ifm->ifi_index > 0)
2545 dev = __dev_get_by_index(net, ifm->ifi_index);
2546 else if (tb[IFLA_IFNAME])
2547 dev = __dev_get_by_name(net, ifname);
2548 else if (tb[IFLA_GROUP])
2549 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2550 else
2551 return -EINVAL;
2552
2553 if (!dev)
2554 return -ENODEV;
2555
2556 return rtnl_delete_link(dev);
2557 }
2558
2559 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2560 {
2561 unsigned int old_flags;
2562 int err;
2563
2564 old_flags = dev->flags;
2565 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2566 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2567 if (err < 0)
2568 return err;
2569 }
2570
2571 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2572
2573 __dev_notify_flags(dev, old_flags, ~0U);
2574 return 0;
2575 }
2576 EXPORT_SYMBOL(rtnl_configure_link);
2577
2578 struct net_device *rtnl_create_link(struct net *net,
2579 const char *ifname, unsigned char name_assign_type,
2580 const struct rtnl_link_ops *ops, struct nlattr *tb[])
2581 {
2582 struct net_device *dev;
2583 unsigned int num_tx_queues = 1;
2584 unsigned int num_rx_queues = 1;
2585
2586 if (tb[IFLA_NUM_TX_QUEUES])
2587 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2588 else if (ops->get_num_tx_queues)
2589 num_tx_queues = ops->get_num_tx_queues();
2590
2591 if (tb[IFLA_NUM_RX_QUEUES])
2592 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2593 else if (ops->get_num_rx_queues)
2594 num_rx_queues = ops->get_num_rx_queues();
2595
2596 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2597 ops->setup, num_tx_queues, num_rx_queues);
2598 if (!dev)
2599 return ERR_PTR(-ENOMEM);
2600
2601 dev_net_set(dev, net);
2602 dev->rtnl_link_ops = ops;
2603 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2604
2605 if (tb[IFLA_MTU])
2606 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2607 if (tb[IFLA_ADDRESS]) {
2608 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2609 nla_len(tb[IFLA_ADDRESS]));
2610 dev->addr_assign_type = NET_ADDR_SET;
2611 }
2612 if (tb[IFLA_BROADCAST])
2613 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2614 nla_len(tb[IFLA_BROADCAST]));
2615 if (tb[IFLA_TXQLEN])
2616 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2617 if (tb[IFLA_OPERSTATE])
2618 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2619 if (tb[IFLA_LINKMODE])
2620 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2621 if (tb[IFLA_GROUP])
2622 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2623
2624 return dev;
2625 }
2626 EXPORT_SYMBOL(rtnl_create_link);
2627
2628 static int rtnl_group_changelink(const struct sk_buff *skb,
2629 struct net *net, int group,
2630 struct ifinfomsg *ifm,
2631 struct netlink_ext_ack *extack,
2632 struct nlattr **tb)
2633 {
2634 struct net_device *dev, *aux;
2635 int err;
2636
2637 for_each_netdev_safe(net, dev, aux) {
2638 if (dev->group == group) {
2639 err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
2640 if (err < 0)
2641 return err;
2642 }
2643 }
2644
2645 return 0;
2646 }
2647
2648 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2649 struct netlink_ext_ack *extack)
2650 {
2651 struct net *net = sock_net(skb->sk);
2652 const struct rtnl_link_ops *ops;
2653 const struct rtnl_link_ops *m_ops = NULL;
2654 struct net_device *dev;
2655 struct net_device *master_dev = NULL;
2656 struct ifinfomsg *ifm;
2657 char kind[MODULE_NAME_LEN];
2658 char ifname[IFNAMSIZ];
2659 struct nlattr *tb[IFLA_MAX+1];
2660 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2661 unsigned char name_assign_type = NET_NAME_USER;
2662 int err;
2663
2664 #ifdef CONFIG_MODULES
2665 replay:
2666 #endif
2667 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2668 if (err < 0)
2669 return err;
2670
2671 if (tb[IFLA_IF_NETNSID])
2672 return -EOPNOTSUPP;
2673
2674 if (tb[IFLA_IFNAME])
2675 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2676 else
2677 ifname[0] = '\0';
2678
2679 ifm = nlmsg_data(nlh);
2680 if (ifm->ifi_index > 0)
2681 dev = __dev_get_by_index(net, ifm->ifi_index);
2682 else {
2683 if (ifname[0])
2684 dev = __dev_get_by_name(net, ifname);
2685 else
2686 dev = NULL;
2687 }
2688
2689 if (dev) {
2690 master_dev = netdev_master_upper_dev_get(dev);
2691 if (master_dev)
2692 m_ops = master_dev->rtnl_link_ops;
2693 }
2694
2695 err = validate_linkmsg(dev, tb);
2696 if (err < 0)
2697 return err;
2698
2699 if (tb[IFLA_LINKINFO]) {
2700 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2701 tb[IFLA_LINKINFO], ifla_info_policy,
2702 NULL);
2703 if (err < 0)
2704 return err;
2705 } else
2706 memset(linkinfo, 0, sizeof(linkinfo));
2707
2708 if (linkinfo[IFLA_INFO_KIND]) {
2709 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2710 ops = rtnl_link_ops_get(kind);
2711 } else {
2712 kind[0] = '\0';
2713 ops = NULL;
2714 }
2715
2716 if (1) {
2717 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2718 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2719 struct nlattr **data = NULL;
2720 struct nlattr **slave_data = NULL;
2721 struct net *dest_net, *link_net = NULL;
2722
2723 if (ops) {
2724 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2725 err = nla_parse_nested(attr, ops->maxtype,
2726 linkinfo[IFLA_INFO_DATA],
2727 ops->policy, NULL);
2728 if (err < 0)
2729 return err;
2730 data = attr;
2731 }
2732 if (ops->validate) {
2733 err = ops->validate(tb, data, extack);
2734 if (err < 0)
2735 return err;
2736 }
2737 }
2738
2739 if (m_ops) {
2740 if (m_ops->slave_maxtype &&
2741 linkinfo[IFLA_INFO_SLAVE_DATA]) {
2742 err = nla_parse_nested(slave_attr,
2743 m_ops->slave_maxtype,
2744 linkinfo[IFLA_INFO_SLAVE_DATA],
2745 m_ops->slave_policy,
2746 NULL);
2747 if (err < 0)
2748 return err;
2749 slave_data = slave_attr;
2750 }
2751 }
2752
2753 if (dev) {
2754 int status = 0;
2755
2756 if (nlh->nlmsg_flags & NLM_F_EXCL)
2757 return -EEXIST;
2758 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2759 return -EOPNOTSUPP;
2760
2761 if (linkinfo[IFLA_INFO_DATA]) {
2762 if (!ops || ops != dev->rtnl_link_ops ||
2763 !ops->changelink)
2764 return -EOPNOTSUPP;
2765
2766 err = ops->changelink(dev, tb, data, extack);
2767 if (err < 0)
2768 return err;
2769 status |= DO_SETLINK_NOTIFY;
2770 }
2771
2772 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2773 if (!m_ops || !m_ops->slave_changelink)
2774 return -EOPNOTSUPP;
2775
2776 err = m_ops->slave_changelink(master_dev, dev,
2777 tb, slave_data,
2778 extack);
2779 if (err < 0)
2780 return err;
2781 status |= DO_SETLINK_NOTIFY;
2782 }
2783
2784 return do_setlink(skb, dev, ifm, extack, tb, ifname,
2785 status);
2786 }
2787
2788 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2789 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2790 return rtnl_group_changelink(skb, net,
2791 nla_get_u32(tb[IFLA_GROUP]),
2792 ifm, extack, tb);
2793 return -ENODEV;
2794 }
2795
2796 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
2797 return -EOPNOTSUPP;
2798
2799 if (!ops) {
2800 #ifdef CONFIG_MODULES
2801 if (kind[0]) {
2802 __rtnl_unlock();
2803 request_module("rtnl-link-%s", kind);
2804 rtnl_lock();
2805 ops = rtnl_link_ops_get(kind);
2806 if (ops)
2807 goto replay;
2808 }
2809 #endif
2810 return -EOPNOTSUPP;
2811 }
2812
2813 if (!ops->setup)
2814 return -EOPNOTSUPP;
2815
2816 if (!ifname[0]) {
2817 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2818 name_assign_type = NET_NAME_ENUM;
2819 }
2820
2821 dest_net = rtnl_link_get_net(net, tb);
2822 if (IS_ERR(dest_net))
2823 return PTR_ERR(dest_net);
2824
2825 err = -EPERM;
2826 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2827 goto out;
2828
2829 if (tb[IFLA_LINK_NETNSID]) {
2830 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2831
2832 link_net = get_net_ns_by_id(dest_net, id);
2833 if (!link_net) {
2834 err = -EINVAL;
2835 goto out;
2836 }
2837 err = -EPERM;
2838 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2839 goto out;
2840 }
2841
2842 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2843 name_assign_type, ops, tb);
2844 if (IS_ERR(dev)) {
2845 err = PTR_ERR(dev);
2846 goto out;
2847 }
2848
2849 dev->ifindex = ifm->ifi_index;
2850
2851 if (ops->newlink) {
2852 err = ops->newlink(link_net ? : net, dev, tb, data,
2853 extack);
2854 /* Drivers should call free_netdev() in ->destructor
2855 * and unregister it on failure after registration
2856 * so that device could be finally freed in rtnl_unlock.
2857 */
2858 if (err < 0) {
2859 /* If device is not registered at all, free it now */
2860 if (dev->reg_state == NETREG_UNINITIALIZED)
2861 free_netdev(dev);
2862 goto out;
2863 }
2864 } else {
2865 err = register_netdevice(dev);
2866 if (err < 0) {
2867 free_netdev(dev);
2868 goto out;
2869 }
2870 }
2871 err = rtnl_configure_link(dev, ifm);
2872 if (err < 0)
2873 goto out_unregister;
2874 if (link_net) {
2875 err = dev_change_net_namespace(dev, dest_net, ifname);
2876 if (err < 0)
2877 goto out_unregister;
2878 }
2879 if (tb[IFLA_MASTER]) {
2880 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]),
2881 extack);
2882 if (err)
2883 goto out_unregister;
2884 }
2885 out:
2886 if (link_net)
2887 put_net(link_net);
2888 put_net(dest_net);
2889 return err;
2890 out_unregister:
2891 if (ops->newlink) {
2892 LIST_HEAD(list_kill);
2893
2894 ops->dellink(dev, &list_kill);
2895 unregister_netdevice_many(&list_kill);
2896 } else {
2897 unregister_netdevice(dev);
2898 }
2899 goto out;
2900 }
2901 }
2902
2903 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2904 struct netlink_ext_ack *extack)
2905 {
2906 struct net *net = sock_net(skb->sk);
2907 struct net *tgt_net = net;
2908 struct ifinfomsg *ifm;
2909 char ifname[IFNAMSIZ];
2910 struct nlattr *tb[IFLA_MAX+1];
2911 struct net_device *dev = NULL;
2912 struct sk_buff *nskb;
2913 int netnsid = -1;
2914 int err;
2915 u32 ext_filter_mask = 0;
2916
2917 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2918 if (err < 0)
2919 return err;
2920
2921 if (tb[IFLA_IF_NETNSID]) {
2922 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
2923 tgt_net = get_target_net(NETLINK_CB(skb).sk, netnsid);
2924 if (IS_ERR(tgt_net))
2925 return PTR_ERR(tgt_net);
2926 }
2927
2928 if (tb[IFLA_IFNAME])
2929 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2930
2931 if (tb[IFLA_EXT_MASK])
2932 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2933
2934 err = -EINVAL;
2935 ifm = nlmsg_data(nlh);
2936 if (ifm->ifi_index > 0)
2937 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
2938 else if (tb[IFLA_IFNAME])
2939 dev = __dev_get_by_name(tgt_net, ifname);
2940 else
2941 goto out;
2942
2943 err = -ENODEV;
2944 if (dev == NULL)
2945 goto out;
2946
2947 err = -ENOBUFS;
2948 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2949 if (nskb == NULL)
2950 goto out;
2951
2952 err = rtnl_fill_ifinfo(nskb, dev, net,
2953 RTM_NEWLINK, NETLINK_CB(skb).portid,
2954 nlh->nlmsg_seq, 0, 0, ext_filter_mask,
2955 0, NULL, netnsid);
2956 if (err < 0) {
2957 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2958 WARN_ON(err == -EMSGSIZE);
2959 kfree_skb(nskb);
2960 } else
2961 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2962 out:
2963 if (netnsid >= 0)
2964 put_net(tgt_net);
2965
2966 return err;
2967 }
2968
2969 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2970 {
2971 struct net *net = sock_net(skb->sk);
2972 struct net_device *dev;
2973 struct nlattr *tb[IFLA_MAX+1];
2974 u32 ext_filter_mask = 0;
2975 u16 min_ifinfo_dump_size = 0;
2976 int hdrlen;
2977
2978 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2979 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2980 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2981
2982 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
2983 if (tb[IFLA_EXT_MASK])
2984 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2985 }
2986
2987 if (!ext_filter_mask)
2988 return NLMSG_GOODSIZE;
2989 /*
2990 * traverse the list of net devices and compute the minimum
2991 * buffer size based upon the filter mask.
2992 */
2993 rcu_read_lock();
2994 for_each_netdev_rcu(net, dev) {
2995 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2996 if_nlmsg_size(dev,
2997 ext_filter_mask));
2998 }
2999 rcu_read_unlock();
3000
3001 return nlmsg_total_size(min_ifinfo_dump_size);
3002 }
3003
3004 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3005 {
3006 int idx;
3007 int s_idx = cb->family;
3008
3009 if (s_idx == 0)
3010 s_idx = 1;
3011
3012 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3013 int type = cb->nlh->nlmsg_type-RTM_BASE;
3014 struct rtnl_link *handlers;
3015 rtnl_dumpit_func dumpit;
3016
3017 if (idx < s_idx || idx == PF_PACKET)
3018 continue;
3019
3020 handlers = rtnl_dereference(rtnl_msg_handlers[idx]);
3021 if (!handlers)
3022 continue;
3023
3024 dumpit = READ_ONCE(handlers[type].dumpit);
3025 if (!dumpit)
3026 continue;
3027
3028 if (idx > s_idx) {
3029 memset(&cb->args[0], 0, sizeof(cb->args));
3030 cb->prev_seq = 0;
3031 cb->seq = 0;
3032 }
3033 if (dumpit(skb, cb))
3034 break;
3035 }
3036 cb->family = idx;
3037
3038 return skb->len;
3039 }
3040
3041 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3042 unsigned int change,
3043 u32 event, gfp_t flags, int *new_nsid)
3044 {
3045 struct net *net = dev_net(dev);
3046 struct sk_buff *skb;
3047 int err = -ENOBUFS;
3048 size_t if_info_size;
3049
3050 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3051 if (skb == NULL)
3052 goto errout;
3053
3054 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3055 type, 0, 0, change, 0, 0, event,
3056 new_nsid, -1);
3057 if (err < 0) {
3058 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3059 WARN_ON(err == -EMSGSIZE);
3060 kfree_skb(skb);
3061 goto errout;
3062 }
3063 return skb;
3064 errout:
3065 if (err < 0)
3066 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3067 return NULL;
3068 }
3069
3070 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3071 {
3072 struct net *net = dev_net(dev);
3073
3074 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3075 }
3076
3077 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3078 unsigned int change, u32 event,
3079 gfp_t flags, int *new_nsid)
3080 {
3081 struct sk_buff *skb;
3082
3083 if (dev->reg_state != NETREG_REGISTERED)
3084 return;
3085
3086 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid);
3087 if (skb)
3088 rtmsg_ifinfo_send(skb, dev, flags);
3089 }
3090
3091 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3092 gfp_t flags)
3093 {
3094 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, NULL);
3095 }
3096
3097 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3098 gfp_t flags, int *new_nsid)
3099 {
3100 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3101 new_nsid);
3102 }
3103
3104 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3105 struct net_device *dev,
3106 u8 *addr, u16 vid, u32 pid, u32 seq,
3107 int type, unsigned int flags,
3108 int nlflags, u16 ndm_state)
3109 {
3110 struct nlmsghdr *nlh;
3111 struct ndmsg *ndm;
3112
3113 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3114 if (!nlh)
3115 return -EMSGSIZE;
3116
3117 ndm = nlmsg_data(nlh);
3118 ndm->ndm_family = AF_BRIDGE;
3119 ndm->ndm_pad1 = 0;
3120 ndm->ndm_pad2 = 0;
3121 ndm->ndm_flags = flags;
3122 ndm->ndm_type = 0;
3123 ndm->ndm_ifindex = dev->ifindex;
3124 ndm->ndm_state = ndm_state;
3125
3126 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3127 goto nla_put_failure;
3128 if (vid)
3129 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3130 goto nla_put_failure;
3131
3132 nlmsg_end(skb, nlh);
3133 return 0;
3134
3135 nla_put_failure:
3136 nlmsg_cancel(skb, nlh);
3137 return -EMSGSIZE;
3138 }
3139
3140 static inline size_t rtnl_fdb_nlmsg_size(void)
3141 {
3142 return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3143 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */
3144 nla_total_size(sizeof(u16)) + /* NDA_VLAN */
3145 0;
3146 }
3147
3148 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3149 u16 ndm_state)
3150 {
3151 struct net *net = dev_net(dev);
3152 struct sk_buff *skb;
3153 int err = -ENOBUFS;
3154
3155 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3156 if (!skb)
3157 goto errout;
3158
3159 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3160 0, 0, type, NTF_SELF, 0, ndm_state);
3161 if (err < 0) {
3162 kfree_skb(skb);
3163 goto errout;
3164 }
3165
3166 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3167 return;
3168 errout:
3169 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3170 }
3171
3172 /**
3173 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3174 */
3175 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3176 struct nlattr *tb[],
3177 struct net_device *dev,
3178 const unsigned char *addr, u16 vid,
3179 u16 flags)
3180 {
3181 int err = -EINVAL;
3182
3183 /* If aging addresses are supported device will need to
3184 * implement its own handler for this.
3185 */
3186 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3187 pr_info("%s: FDB only supports static addresses\n", dev->name);
3188 return err;
3189 }
3190
3191 if (vid) {
3192 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3193 return err;
3194 }
3195
3196 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3197 err = dev_uc_add_excl(dev, addr);
3198 else if (is_multicast_ether_addr(addr))
3199 err = dev_mc_add_excl(dev, addr);
3200
3201 /* Only return duplicate errors if NLM_F_EXCL is set */
3202 if (err == -EEXIST && !(flags & NLM_F_EXCL))
3203 err = 0;
3204
3205 return err;
3206 }
3207 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3208
3209 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3210 struct netlink_ext_ack *extack)
3211 {
3212 u16 vid = 0;
3213
3214 if (vlan_attr) {
3215 if (nla_len(vlan_attr) != sizeof(u16)) {
3216 NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3217 return -EINVAL;
3218 }
3219
3220 vid = nla_get_u16(vlan_attr);
3221
3222 if (!vid || vid >= VLAN_VID_MASK) {
3223 NL_SET_ERR_MSG(extack, "invalid vlan id");
3224 return -EINVAL;
3225 }
3226 }
3227 *p_vid = vid;
3228 return 0;
3229 }
3230
3231 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3232 struct netlink_ext_ack *extack)
3233 {
3234 struct net *net = sock_net(skb->sk);
3235 struct ndmsg *ndm;
3236 struct nlattr *tb[NDA_MAX+1];
3237 struct net_device *dev;
3238 u8 *addr;
3239 u16 vid;
3240 int err;
3241
3242 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3243 if (err < 0)
3244 return err;
3245
3246 ndm = nlmsg_data(nlh);
3247 if (ndm->ndm_ifindex == 0) {
3248 NL_SET_ERR_MSG(extack, "invalid ifindex");
3249 return -EINVAL;
3250 }
3251
3252 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3253 if (dev == NULL) {
3254 NL_SET_ERR_MSG(extack, "unknown ifindex");
3255 return -ENODEV;
3256 }
3257
3258 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3259 NL_SET_ERR_MSG(extack, "invalid address");
3260 return -EINVAL;
3261 }
3262
3263 addr = nla_data(tb[NDA_LLADDR]);
3264
3265 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3266 if (err)
3267 return err;
3268
3269 err = -EOPNOTSUPP;
3270
3271 /* Support fdb on master device the net/bridge default case */
3272 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3273 (dev->priv_flags & IFF_BRIDGE_PORT)) {
3274 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3275 const struct net_device_ops *ops = br_dev->netdev_ops;
3276
3277 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3278 nlh->nlmsg_flags);
3279 if (err)
3280 goto out;
3281 else
3282 ndm->ndm_flags &= ~NTF_MASTER;
3283 }
3284
3285 /* Embedded bridge, macvlan, and any other device support */
3286 if ((ndm->ndm_flags & NTF_SELF)) {
3287 if (dev->netdev_ops->ndo_fdb_add)
3288 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3289 vid,
3290 nlh->nlmsg_flags);
3291 else
3292 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3293 nlh->nlmsg_flags);
3294
3295 if (!err) {
3296 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3297 ndm->ndm_state);
3298 ndm->ndm_flags &= ~NTF_SELF;
3299 }
3300 }
3301 out:
3302 return err;
3303 }
3304
3305 /**
3306 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3307 */
3308 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3309 struct nlattr *tb[],
3310 struct net_device *dev,
3311 const unsigned char *addr, u16 vid)
3312 {
3313 int err = -EINVAL;
3314
3315 /* If aging addresses are supported device will need to
3316 * implement its own handler for this.
3317 */
3318 if (!(ndm->ndm_state & NUD_PERMANENT)) {
3319 pr_info("%s: FDB only supports static addresses\n", dev->name);
3320 return err;
3321 }
3322
3323 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3324 err = dev_uc_del(dev, addr);
3325 else if (is_multicast_ether_addr(addr))
3326 err = dev_mc_del(dev, addr);
3327
3328 return err;
3329 }
3330 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3331
3332 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3333 struct netlink_ext_ack *extack)
3334 {
3335 struct net *net = sock_net(skb->sk);
3336 struct ndmsg *ndm;
3337 struct nlattr *tb[NDA_MAX+1];
3338 struct net_device *dev;
3339 int err = -EINVAL;
3340 __u8 *addr;
3341 u16 vid;
3342
3343 if (!netlink_capable(skb, CAP_NET_ADMIN))
3344 return -EPERM;
3345
3346 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3347 if (err < 0)
3348 return err;
3349
3350 ndm = nlmsg_data(nlh);
3351 if (ndm->ndm_ifindex == 0) {
3352 NL_SET_ERR_MSG(extack, "invalid ifindex");
3353 return -EINVAL;
3354 }
3355
3356 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3357 if (dev == NULL) {
3358 NL_SET_ERR_MSG(extack, "unknown ifindex");
3359 return -ENODEV;
3360 }
3361
3362 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3363 NL_SET_ERR_MSG(extack, "invalid address");
3364 return -EINVAL;
3365 }
3366
3367 addr = nla_data(tb[NDA_LLADDR]);
3368
3369 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3370 if (err)
3371 return err;
3372
3373 err = -EOPNOTSUPP;
3374
3375 /* Support fdb on master device the net/bridge default case */
3376 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3377 (dev->priv_flags & IFF_BRIDGE_PORT)) {
3378 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3379 const struct net_device_ops *ops = br_dev->netdev_ops;
3380
3381 if (ops->ndo_fdb_del)
3382 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3383
3384 if (err)
3385 goto out;
3386 else
3387 ndm->ndm_flags &= ~NTF_MASTER;
3388 }
3389
3390 /* Embedded bridge, macvlan, and any other device support */
3391 if (ndm->ndm_flags & NTF_SELF) {
3392 if (dev->netdev_ops->ndo_fdb_del)
3393 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3394 vid);
3395 else
3396 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3397
3398 if (!err) {
3399 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3400 ndm->ndm_state);
3401 ndm->ndm_flags &= ~NTF_SELF;
3402 }
3403 }
3404 out:
3405 return err;
3406 }
3407
3408 static int nlmsg_populate_fdb(struct sk_buff *skb,
3409 struct netlink_callback *cb,
3410 struct net_device *dev,
3411 int *idx,
3412 struct netdev_hw_addr_list *list)
3413 {
3414 struct netdev_hw_addr *ha;
3415 int err;
3416 u32 portid, seq;
3417
3418 portid = NETLINK_CB(cb->skb).portid;
3419 seq = cb->nlh->nlmsg_seq;
3420
3421 list_for_each_entry(ha, &list->list, list) {
3422 if (*idx < cb->args[2])
3423 goto skip;
3424
3425 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3426 portid, seq,
3427 RTM_NEWNEIGH, NTF_SELF,
3428 NLM_F_MULTI, NUD_PERMANENT);
3429 if (err < 0)
3430 return err;
3431 skip:
3432 *idx += 1;
3433 }
3434 return 0;
3435 }
3436
3437 /**
3438 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3439 * @nlh: netlink message header
3440 * @dev: netdevice
3441 *
3442 * Default netdevice operation to dump the existing unicast address list.
3443 * Returns number of addresses from list put in skb.
3444 */
3445 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3446 struct netlink_callback *cb,
3447 struct net_device *dev,
3448 struct net_device *filter_dev,
3449 int *idx)
3450 {
3451 int err;
3452
3453 netif_addr_lock_bh(dev);
3454 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3455 if (err)
3456 goto out;
3457 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3458 out:
3459 netif_addr_unlock_bh(dev);
3460 return err;
3461 }
3462 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3463
3464 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3465 {
3466 struct net_device *dev;
3467 struct nlattr *tb[IFLA_MAX+1];
3468 struct net_device *br_dev = NULL;
3469 const struct net_device_ops *ops = NULL;
3470 const struct net_device_ops *cops = NULL;
3471 struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3472 struct net *net = sock_net(skb->sk);
3473 struct hlist_head *head;
3474 int brport_idx = 0;
3475 int br_idx = 0;
3476 int h, s_h;
3477 int idx = 0, s_idx;
3478 int err = 0;
3479 int fidx = 0;
3480
3481 err = nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb,
3482 IFLA_MAX, ifla_policy, NULL);
3483 if (err < 0) {
3484 return -EINVAL;
3485 } else if (err == 0) {
3486 if (tb[IFLA_MASTER])
3487 br_idx = nla_get_u32(tb[IFLA_MASTER]);
3488 }
3489
3490 brport_idx = ifm->ifi_index;
3491
3492 if (br_idx) {
3493 br_dev = __dev_get_by_index(net, br_idx);
3494 if (!br_dev)
3495 return -ENODEV;
3496
3497 ops = br_dev->netdev_ops;
3498 }
3499
3500 s_h = cb->args[0];
3501 s_idx = cb->args[1];
3502
3503 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3504 idx = 0;
3505 head = &net->dev_index_head[h];
3506 hlist_for_each_entry(dev, head, index_hlist) {
3507
3508 if (brport_idx && (dev->ifindex != brport_idx))
3509 continue;
3510
3511 if (!br_idx) { /* user did not specify a specific bridge */
3512 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3513 br_dev = netdev_master_upper_dev_get(dev);
3514 cops = br_dev->netdev_ops;
3515 }
3516 } else {
3517 if (dev != br_dev &&
3518 !(dev->priv_flags & IFF_BRIDGE_PORT))
3519 continue;
3520
3521 if (br_dev != netdev_master_upper_dev_get(dev) &&
3522 !(dev->priv_flags & IFF_EBRIDGE))
3523 continue;
3524 cops = ops;
3525 }
3526
3527 if (idx < s_idx)
3528 goto cont;
3529
3530 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3531 if (cops && cops->ndo_fdb_dump) {
3532 err = cops->ndo_fdb_dump(skb, cb,
3533 br_dev, dev,
3534 &fidx);
3535 if (err == -EMSGSIZE)
3536 goto out;
3537 }
3538 }
3539
3540 if (dev->netdev_ops->ndo_fdb_dump)
3541 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
3542 dev, NULL,
3543 &fidx);
3544 else
3545 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
3546 &fidx);
3547 if (err == -EMSGSIZE)
3548 goto out;
3549
3550 cops = NULL;
3551
3552 /* reset fdb offset to 0 for rest of the interfaces */
3553 cb->args[2] = 0;
3554 fidx = 0;
3555 cont:
3556 idx++;
3557 }
3558 }
3559
3560 out:
3561 cb->args[0] = h;
3562 cb->args[1] = idx;
3563 cb->args[2] = fidx;
3564
3565 return skb->len;
3566 }
3567
3568 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3569 unsigned int attrnum, unsigned int flag)
3570 {
3571 if (mask & flag)
3572 return nla_put_u8(skb, attrnum, !!(flags & flag));
3573 return 0;
3574 }
3575
3576 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3577 struct net_device *dev, u16 mode,
3578 u32 flags, u32 mask, int nlflags,
3579 u32 filter_mask,
3580 int (*vlan_fill)(struct sk_buff *skb,
3581 struct net_device *dev,
3582 u32 filter_mask))
3583 {
3584 struct nlmsghdr *nlh;
3585 struct ifinfomsg *ifm;
3586 struct nlattr *br_afspec;
3587 struct nlattr *protinfo;
3588 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3589 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3590 int err = 0;
3591
3592 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3593 if (nlh == NULL)
3594 return -EMSGSIZE;
3595
3596 ifm = nlmsg_data(nlh);
3597 ifm->ifi_family = AF_BRIDGE;
3598 ifm->__ifi_pad = 0;
3599 ifm->ifi_type = dev->type;
3600 ifm->ifi_index = dev->ifindex;
3601 ifm->ifi_flags = dev_get_flags(dev);
3602 ifm->ifi_change = 0;
3603
3604
3605 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3606 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3607 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3608 (br_dev &&
3609 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3610 (dev->addr_len &&
3611 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3612 (dev->ifindex != dev_get_iflink(dev) &&
3613 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3614 goto nla_put_failure;
3615
3616 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3617 if (!br_afspec)
3618 goto nla_put_failure;
3619
3620 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3621 nla_nest_cancel(skb, br_afspec);
3622 goto nla_put_failure;
3623 }
3624
3625 if (mode != BRIDGE_MODE_UNDEF) {
3626 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3627 nla_nest_cancel(skb, br_afspec);
3628 goto nla_put_failure;
3629 }
3630 }
3631 if (vlan_fill) {
3632 err = vlan_fill(skb, dev, filter_mask);
3633 if (err) {
3634 nla_nest_cancel(skb, br_afspec);
3635 goto nla_put_failure;
3636 }
3637 }
3638 nla_nest_end(skb, br_afspec);
3639
3640 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3641 if (!protinfo)
3642 goto nla_put_failure;
3643
3644 if (brport_nla_put_flag(skb, flags, mask,
3645 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3646 brport_nla_put_flag(skb, flags, mask,
3647 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3648 brport_nla_put_flag(skb, flags, mask,
3649 IFLA_BRPORT_FAST_LEAVE,
3650 BR_MULTICAST_FAST_LEAVE) ||
3651 brport_nla_put_flag(skb, flags, mask,
3652 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3653 brport_nla_put_flag(skb, flags, mask,
3654 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3655 brport_nla_put_flag(skb, flags, mask,
3656 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3657 brport_nla_put_flag(skb, flags, mask,
3658 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3659 brport_nla_put_flag(skb, flags, mask,
3660 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3661 nla_nest_cancel(skb, protinfo);
3662 goto nla_put_failure;
3663 }
3664
3665 nla_nest_end(skb, protinfo);
3666
3667 nlmsg_end(skb, nlh);
3668 return 0;
3669 nla_put_failure:
3670 nlmsg_cancel(skb, nlh);
3671 return err ? err : -EMSGSIZE;
3672 }
3673 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3674
3675 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3676 {
3677 struct net *net = sock_net(skb->sk);
3678 struct net_device *dev;
3679 int idx = 0;
3680 u32 portid = NETLINK_CB(cb->skb).portid;
3681 u32 seq = cb->nlh->nlmsg_seq;
3682 u32 filter_mask = 0;
3683 int err;
3684
3685 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3686 struct nlattr *extfilt;
3687
3688 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3689 IFLA_EXT_MASK);
3690 if (extfilt) {
3691 if (nla_len(extfilt) < sizeof(filter_mask))
3692 return -EINVAL;
3693
3694 filter_mask = nla_get_u32(extfilt);
3695 }
3696 }
3697
3698 rcu_read_lock();
3699 for_each_netdev_rcu(net, dev) {
3700 const struct net_device_ops *ops = dev->netdev_ops;
3701 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3702
3703 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3704 if (idx >= cb->args[0]) {
3705 err = br_dev->netdev_ops->ndo_bridge_getlink(
3706 skb, portid, seq, dev,
3707 filter_mask, NLM_F_MULTI);
3708 if (err < 0 && err != -EOPNOTSUPP) {
3709 if (likely(skb->len))
3710 break;
3711
3712 goto out_err;
3713 }
3714 }
3715 idx++;
3716 }
3717
3718 if (ops->ndo_bridge_getlink) {
3719 if (idx >= cb->args[0]) {
3720 err = ops->ndo_bridge_getlink(skb, portid,
3721 seq, dev,
3722 filter_mask,
3723 NLM_F_MULTI);
3724 if (err < 0 && err != -EOPNOTSUPP) {
3725 if (likely(skb->len))
3726 break;
3727
3728 goto out_err;
3729 }
3730 }
3731 idx++;
3732 }
3733 }
3734 err = skb->len;
3735 out_err:
3736 rcu_read_unlock();
3737 cb->args[0] = idx;
3738
3739 return err;
3740 }
3741
3742 static inline size_t bridge_nlmsg_size(void)
3743 {
3744 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3745 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3746 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3747 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
3748 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
3749 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
3750 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
3751 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
3752 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3753 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
3754 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
3755 }
3756
3757 static int rtnl_bridge_notify(struct net_device *dev)
3758 {
3759 struct net *net = dev_net(dev);
3760 struct sk_buff *skb;
3761 int err = -EOPNOTSUPP;
3762
3763 if (!dev->netdev_ops->ndo_bridge_getlink)
3764 return 0;
3765
3766 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3767 if (!skb) {
3768 err = -ENOMEM;
3769 goto errout;
3770 }
3771
3772 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3773 if (err < 0)
3774 goto errout;
3775
3776 if (!skb->len)
3777 goto errout;
3778
3779 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3780 return 0;
3781 errout:
3782 WARN_ON(err == -EMSGSIZE);
3783 kfree_skb(skb);
3784 if (err)
3785 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3786 return err;
3787 }
3788
3789 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3790 struct netlink_ext_ack *extack)
3791 {
3792 struct net *net = sock_net(skb->sk);
3793 struct ifinfomsg *ifm;
3794 struct net_device *dev;
3795 struct nlattr *br_spec, *attr = NULL;
3796 int rem, err = -EOPNOTSUPP;
3797 u16 flags = 0;
3798 bool have_flags = false;
3799
3800 if (nlmsg_len(nlh) < sizeof(*ifm))
3801 return -EINVAL;
3802
3803 ifm = nlmsg_data(nlh);
3804 if (ifm->ifi_family != AF_BRIDGE)
3805 return -EPFNOSUPPORT;
3806
3807 dev = __dev_get_by_index(net, ifm->ifi_index);
3808 if (!dev) {
3809 NL_SET_ERR_MSG(extack, "unknown ifindex");
3810 return -ENODEV;
3811 }
3812
3813 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3814 if (br_spec) {
3815 nla_for_each_nested(attr, br_spec, rem) {
3816 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3817 if (nla_len(attr) < sizeof(flags))
3818 return -EINVAL;
3819
3820 have_flags = true;
3821 flags = nla_get_u16(attr);
3822 break;
3823 }
3824 }
3825 }
3826
3827 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3828 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3829
3830 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3831 err = -EOPNOTSUPP;
3832 goto out;
3833 }
3834
3835 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3836 if (err)
3837 goto out;
3838
3839 flags &= ~BRIDGE_FLAGS_MASTER;
3840 }
3841
3842 if ((flags & BRIDGE_FLAGS_SELF)) {
3843 if (!dev->netdev_ops->ndo_bridge_setlink)
3844 err = -EOPNOTSUPP;
3845 else
3846 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3847 flags);
3848 if (!err) {
3849 flags &= ~BRIDGE_FLAGS_SELF;
3850
3851 /* Generate event to notify upper layer of bridge
3852 * change
3853 */
3854 err = rtnl_bridge_notify(dev);
3855 }
3856 }
3857
3858 if (have_flags)
3859 memcpy(nla_data(attr), &flags, sizeof(flags));
3860 out:
3861 return err;
3862 }
3863
3864 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
3865 struct netlink_ext_ack *extack)
3866 {
3867 struct net *net = sock_net(skb->sk);
3868 struct ifinfomsg *ifm;
3869 struct net_device *dev;
3870 struct nlattr *br_spec, *attr = NULL;
3871 int rem, err = -EOPNOTSUPP;
3872 u16 flags = 0;
3873 bool have_flags = false;
3874
3875 if (nlmsg_len(nlh) < sizeof(*ifm))
3876 return -EINVAL;
3877
3878 ifm = nlmsg_data(nlh);
3879 if (ifm->ifi_family != AF_BRIDGE)
3880 return -EPFNOSUPPORT;
3881
3882 dev = __dev_get_by_index(net, ifm->ifi_index);
3883 if (!dev) {
3884 NL_SET_ERR_MSG(extack, "unknown ifindex");
3885 return -ENODEV;
3886 }
3887
3888 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3889 if (br_spec) {
3890 nla_for_each_nested(attr, br_spec, rem) {
3891 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3892 if (nla_len(attr) < sizeof(flags))
3893 return -EINVAL;
3894
3895 have_flags = true;
3896 flags = nla_get_u16(attr);
3897 break;
3898 }
3899 }
3900 }
3901
3902 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3903 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3904
3905 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3906 err = -EOPNOTSUPP;
3907 goto out;
3908 }
3909
3910 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3911 if (err)
3912 goto out;
3913
3914 flags &= ~BRIDGE_FLAGS_MASTER;
3915 }
3916
3917 if ((flags & BRIDGE_FLAGS_SELF)) {
3918 if (!dev->netdev_ops->ndo_bridge_dellink)
3919 err = -EOPNOTSUPP;
3920 else
3921 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3922 flags);
3923
3924 if (!err) {
3925 flags &= ~BRIDGE_FLAGS_SELF;
3926
3927 /* Generate event to notify upper layer of bridge
3928 * change
3929 */
3930 err = rtnl_bridge_notify(dev);
3931 }
3932 }
3933
3934 if (have_flags)
3935 memcpy(nla_data(attr), &flags, sizeof(flags));
3936 out:
3937 return err;
3938 }
3939
3940 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
3941 {
3942 return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
3943 (!idxattr || idxattr == attrid);
3944 }
3945
3946 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
3947 static int rtnl_get_offload_stats_attr_size(int attr_id)
3948 {
3949 switch (attr_id) {
3950 case IFLA_OFFLOAD_XSTATS_CPU_HIT:
3951 return sizeof(struct rtnl_link_stats64);
3952 }
3953
3954 return 0;
3955 }
3956
3957 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
3958 int *prividx)
3959 {
3960 struct nlattr *attr = NULL;
3961 int attr_id, size;
3962 void *attr_data;
3963 int err;
3964
3965 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3966 dev->netdev_ops->ndo_get_offload_stats))
3967 return -ENODATA;
3968
3969 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3970 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3971 if (attr_id < *prividx)
3972 continue;
3973
3974 size = rtnl_get_offload_stats_attr_size(attr_id);
3975 if (!size)
3976 continue;
3977
3978 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
3979 continue;
3980
3981 attr = nla_reserve_64bit(skb, attr_id, size,
3982 IFLA_OFFLOAD_XSTATS_UNSPEC);
3983 if (!attr)
3984 goto nla_put_failure;
3985
3986 attr_data = nla_data(attr);
3987 memset(attr_data, 0, size);
3988 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
3989 attr_data);
3990 if (err)
3991 goto get_offload_stats_failure;
3992 }
3993
3994 if (!attr)
3995 return -ENODATA;
3996
3997 *prividx = 0;
3998 return 0;
3999
4000 nla_put_failure:
4001 err = -EMSGSIZE;
4002 get_offload_stats_failure:
4003 *prividx = attr_id;
4004 return err;
4005 }
4006
4007 static int rtnl_get_offload_stats_size(const struct net_device *dev)
4008 {
4009 int nla_size = 0;
4010 int attr_id;
4011 int size;
4012
4013 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4014 dev->netdev_ops->ndo_get_offload_stats))
4015 return 0;
4016
4017 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4018 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4019 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4020 continue;
4021 size = rtnl_get_offload_stats_attr_size(attr_id);
4022 nla_size += nla_total_size_64bit(size);
4023 }
4024
4025 if (nla_size != 0)
4026 nla_size += nla_total_size(0);
4027
4028 return nla_size;
4029 }
4030
4031 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
4032 int type, u32 pid, u32 seq, u32 change,
4033 unsigned int flags, unsigned int filter_mask,
4034 int *idxattr, int *prividx)
4035 {
4036 struct if_stats_msg *ifsm;
4037 struct nlmsghdr *nlh;
4038 struct nlattr *attr;
4039 int s_prividx = *prividx;
4040 int err;
4041
4042 ASSERT_RTNL();
4043
4044 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
4045 if (!nlh)
4046 return -EMSGSIZE;
4047
4048 ifsm = nlmsg_data(nlh);
4049 ifsm->family = PF_UNSPEC;
4050 ifsm->pad1 = 0;
4051 ifsm->pad2 = 0;
4052 ifsm->ifindex = dev->ifindex;
4053 ifsm->filter_mask = filter_mask;
4054
4055 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
4056 struct rtnl_link_stats64 *sp;
4057
4058 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
4059 sizeof(struct rtnl_link_stats64),
4060 IFLA_STATS_UNSPEC);
4061 if (!attr)
4062 goto nla_put_failure;
4063
4064 sp = nla_data(attr);
4065 dev_get_stats(dev, sp);
4066 }
4067
4068 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
4069 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4070
4071 if (ops && ops->fill_linkxstats) {
4072 *idxattr = IFLA_STATS_LINK_XSTATS;
4073 attr = nla_nest_start(skb,
4074 IFLA_STATS_LINK_XSTATS);
4075 if (!attr)
4076 goto nla_put_failure;
4077
4078 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4079 nla_nest_end(skb, attr);
4080 if (err)
4081 goto nla_put_failure;
4082 *idxattr = 0;
4083 }
4084 }
4085
4086 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
4087 *idxattr)) {
4088 const struct rtnl_link_ops *ops = NULL;
4089 const struct net_device *master;
4090
4091 master = netdev_master_upper_dev_get(dev);
4092 if (master)
4093 ops = master->rtnl_link_ops;
4094 if (ops && ops->fill_linkxstats) {
4095 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
4096 attr = nla_nest_start(skb,
4097 IFLA_STATS_LINK_XSTATS_SLAVE);
4098 if (!attr)
4099 goto nla_put_failure;
4100
4101 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4102 nla_nest_end(skb, attr);
4103 if (err)
4104 goto nla_put_failure;
4105 *idxattr = 0;
4106 }
4107 }
4108
4109 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
4110 *idxattr)) {
4111 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
4112 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
4113 if (!attr)
4114 goto nla_put_failure;
4115
4116 err = rtnl_get_offload_stats(skb, dev, prividx);
4117 if (err == -ENODATA)
4118 nla_nest_cancel(skb, attr);
4119 else
4120 nla_nest_end(skb, attr);
4121
4122 if (err && err != -ENODATA)
4123 goto nla_put_failure;
4124 *idxattr = 0;
4125 }
4126
4127 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
4128 struct rtnl_af_ops *af_ops;
4129
4130 *idxattr = IFLA_STATS_AF_SPEC;
4131 attr = nla_nest_start(skb, IFLA_STATS_AF_SPEC);
4132 if (!attr)
4133 goto nla_put_failure;
4134
4135 rcu_read_lock();
4136 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4137 if (af_ops->fill_stats_af) {
4138 struct nlattr *af;
4139 int err;
4140
4141 af = nla_nest_start(skb, af_ops->family);
4142 if (!af) {
4143 rcu_read_unlock();
4144 goto nla_put_failure;
4145 }
4146 err = af_ops->fill_stats_af(skb, dev);
4147
4148 if (err == -ENODATA) {
4149 nla_nest_cancel(skb, af);
4150 } else if (err < 0) {
4151 rcu_read_unlock();
4152 goto nla_put_failure;
4153 }
4154
4155 nla_nest_end(skb, af);
4156 }
4157 }
4158 rcu_read_unlock();
4159
4160 nla_nest_end(skb, attr);
4161
4162 *idxattr = 0;
4163 }
4164
4165 nlmsg_end(skb, nlh);
4166
4167 return 0;
4168
4169 nla_put_failure:
4170 /* not a multi message or no progress mean a real error */
4171 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
4172 nlmsg_cancel(skb, nlh);
4173 else
4174 nlmsg_end(skb, nlh);
4175
4176 return -EMSGSIZE;
4177 }
4178
4179 static size_t if_nlmsg_stats_size(const struct net_device *dev,
4180 u32 filter_mask)
4181 {
4182 size_t size = 0;
4183
4184 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
4185 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
4186
4187 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
4188 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4189 int attr = IFLA_STATS_LINK_XSTATS;
4190
4191 if (ops && ops->get_linkxstats_size) {
4192 size += nla_total_size(ops->get_linkxstats_size(dev,
4193 attr));
4194 /* for IFLA_STATS_LINK_XSTATS */
4195 size += nla_total_size(0);
4196 }
4197 }
4198
4199 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
4200 struct net_device *_dev = (struct net_device *)dev;
4201 const struct rtnl_link_ops *ops = NULL;
4202 const struct net_device *master;
4203
4204 /* netdev_master_upper_dev_get can't take const */
4205 master = netdev_master_upper_dev_get(_dev);
4206 if (master)
4207 ops = master->rtnl_link_ops;
4208 if (ops && ops->get_linkxstats_size) {
4209 int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
4210
4211 size += nla_total_size(ops->get_linkxstats_size(dev,
4212 attr));
4213 /* for IFLA_STATS_LINK_XSTATS_SLAVE */
4214 size += nla_total_size(0);
4215 }
4216 }
4217
4218 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
4219 size += rtnl_get_offload_stats_size(dev);
4220
4221 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
4222 struct rtnl_af_ops *af_ops;
4223
4224 /* for IFLA_STATS_AF_SPEC */
4225 size += nla_total_size(0);
4226
4227 rcu_read_lock();
4228 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4229 if (af_ops->get_stats_af_size) {
4230 size += nla_total_size(
4231 af_ops->get_stats_af_size(dev));
4232
4233 /* for AF_* */
4234 size += nla_total_size(0);
4235 }
4236 }
4237 rcu_read_unlock();
4238 }
4239
4240 return size;
4241 }
4242
4243 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
4244 struct netlink_ext_ack *extack)
4245 {
4246 struct net *net = sock_net(skb->sk);
4247 struct net_device *dev = NULL;
4248 int idxattr = 0, prividx = 0;
4249 struct if_stats_msg *ifsm;
4250 struct sk_buff *nskb;
4251 u32 filter_mask;
4252 int err;
4253
4254 if (nlmsg_len(nlh) < sizeof(*ifsm))
4255 return -EINVAL;
4256
4257 ifsm = nlmsg_data(nlh);
4258 if (ifsm->ifindex > 0)
4259 dev = __dev_get_by_index(net, ifsm->ifindex);
4260 else
4261 return -EINVAL;
4262
4263 if (!dev)
4264 return -ENODEV;
4265
4266 filter_mask = ifsm->filter_mask;
4267 if (!filter_mask)
4268 return -EINVAL;
4269
4270 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
4271 if (!nskb)
4272 return -ENOBUFS;
4273
4274 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
4275 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
4276 0, filter_mask, &idxattr, &prividx);
4277 if (err < 0) {
4278 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
4279 WARN_ON(err == -EMSGSIZE);
4280 kfree_skb(nskb);
4281 } else {
4282 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
4283 }
4284
4285 return err;
4286 }
4287
4288 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
4289 {
4290 int h, s_h, err, s_idx, s_idxattr, s_prividx;
4291 struct net *net = sock_net(skb->sk);
4292 unsigned int flags = NLM_F_MULTI;
4293 struct if_stats_msg *ifsm;
4294 struct hlist_head *head;
4295 struct net_device *dev;
4296 u32 filter_mask = 0;
4297 int idx = 0;
4298
4299 s_h = cb->args[0];
4300 s_idx = cb->args[1];
4301 s_idxattr = cb->args[2];
4302 s_prividx = cb->args[3];
4303
4304 cb->seq = net->dev_base_seq;
4305
4306 if (nlmsg_len(cb->nlh) < sizeof(*ifsm))
4307 return -EINVAL;
4308
4309 ifsm = nlmsg_data(cb->nlh);
4310 filter_mask = ifsm->filter_mask;
4311 if (!filter_mask)
4312 return -EINVAL;
4313
4314 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4315 idx = 0;
4316 head = &net->dev_index_head[h];
4317 hlist_for_each_entry(dev, head, index_hlist) {
4318 if (idx < s_idx)
4319 goto cont;
4320 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
4321 NETLINK_CB(cb->skb).portid,
4322 cb->nlh->nlmsg_seq, 0,
4323 flags, filter_mask,
4324 &s_idxattr, &s_prividx);
4325 /* If we ran out of room on the first message,
4326 * we're in trouble
4327 */
4328 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
4329
4330 if (err < 0)
4331 goto out;
4332 s_prividx = 0;
4333 s_idxattr = 0;
4334 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4335 cont:
4336 idx++;
4337 }
4338 }
4339 out:
4340 cb->args[3] = s_prividx;
4341 cb->args[2] = s_idxattr;
4342 cb->args[1] = idx;
4343 cb->args[0] = h;
4344
4345 return skb->len;
4346 }
4347
4348 /* Process one rtnetlink message. */
4349
4350 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
4351 struct netlink_ext_ack *extack)
4352 {
4353 struct net *net = sock_net(skb->sk);
4354 struct rtnl_link *handlers;
4355 int err = -EOPNOTSUPP;
4356 rtnl_doit_func doit;
4357 unsigned int flags;
4358 int kind;
4359 int family;
4360 int type;
4361
4362 type = nlh->nlmsg_type;
4363 if (type > RTM_MAX)
4364 return -EOPNOTSUPP;
4365
4366 type -= RTM_BASE;
4367
4368 /* All the messages must have at least 1 byte length */
4369 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
4370 return 0;
4371
4372 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
4373 kind = type&3;
4374
4375 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
4376 return -EPERM;
4377
4378 if (family >= ARRAY_SIZE(rtnl_msg_handlers))
4379 family = PF_UNSPEC;
4380
4381 rcu_read_lock();
4382 handlers = rcu_dereference(rtnl_msg_handlers[family]);
4383 if (!handlers) {
4384 family = PF_UNSPEC;
4385 handlers = rcu_dereference(rtnl_msg_handlers[family]);
4386 }
4387
4388 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
4389 struct sock *rtnl;
4390 rtnl_dumpit_func dumpit;
4391 u16 min_dump_alloc = 0;
4392
4393 dumpit = READ_ONCE(handlers[type].dumpit);
4394 if (!dumpit) {
4395 family = PF_UNSPEC;
4396 handlers = rcu_dereference(rtnl_msg_handlers[PF_UNSPEC]);
4397 if (!handlers)
4398 goto err_unlock;
4399
4400 dumpit = READ_ONCE(handlers[type].dumpit);
4401 if (!dumpit)
4402 goto err_unlock;
4403 }
4404
4405 refcount_inc(&rtnl_msg_handlers_ref[family]);
4406
4407 if (type == RTM_GETLINK - RTM_BASE)
4408 min_dump_alloc = rtnl_calcit(skb, nlh);
4409
4410 rcu_read_unlock();
4411
4412 rtnl = net->rtnl;
4413 {
4414 struct netlink_dump_control c = {
4415 .dump = dumpit,
4416 .min_dump_alloc = min_dump_alloc,
4417 };
4418 err = netlink_dump_start(rtnl, skb, nlh, &c);
4419 }
4420 refcount_dec(&rtnl_msg_handlers_ref[family]);
4421 return err;
4422 }
4423
4424 doit = READ_ONCE(handlers[type].doit);
4425 if (!doit) {
4426 family = PF_UNSPEC;
4427 handlers = rcu_dereference(rtnl_msg_handlers[family]);
4428 }
4429
4430 flags = READ_ONCE(handlers[type].flags);
4431 if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
4432 refcount_inc(&rtnl_msg_handlers_ref[family]);
4433 doit = READ_ONCE(handlers[type].doit);
4434 rcu_read_unlock();
4435 if (doit)
4436 err = doit(skb, nlh, extack);
4437 refcount_dec(&rtnl_msg_handlers_ref[family]);
4438 return err;
4439 }
4440
4441 rcu_read_unlock();
4442
4443 rtnl_lock();
4444 handlers = rtnl_dereference(rtnl_msg_handlers[family]);
4445 if (handlers) {
4446 doit = READ_ONCE(handlers[type].doit);
4447 if (doit)
4448 err = doit(skb, nlh, extack);
4449 }
4450 rtnl_unlock();
4451 return err;
4452
4453 err_unlock:
4454 rcu_read_unlock();
4455 return -EOPNOTSUPP;
4456 }
4457
4458 static void rtnetlink_rcv(struct sk_buff *skb)
4459 {
4460 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
4461 }
4462
4463 static int rtnetlink_bind(struct net *net, int group)
4464 {
4465 switch (group) {
4466 case RTNLGRP_IPV4_MROUTE_R:
4467 case RTNLGRP_IPV6_MROUTE_R:
4468 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4469 return -EPERM;
4470 break;
4471 }
4472 return 0;
4473 }
4474
4475 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
4476 {
4477 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4478
4479 switch (event) {
4480 case NETDEV_REBOOT:
4481 case NETDEV_CHANGEMTU:
4482 case NETDEV_CHANGEADDR:
4483 case NETDEV_CHANGENAME:
4484 case NETDEV_FEAT_CHANGE:
4485 case NETDEV_BONDING_FAILOVER:
4486 case NETDEV_POST_TYPE_CHANGE:
4487 case NETDEV_NOTIFY_PEERS:
4488 case NETDEV_CHANGEUPPER:
4489 case NETDEV_RESEND_IGMP:
4490 case NETDEV_CHANGEINFODATA:
4491 case NETDEV_CHANGELOWERSTATE:
4492 case NETDEV_CHANGE_TX_QUEUE_LEN:
4493 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
4494 GFP_KERNEL, NULL);
4495 break;
4496 default:
4497 break;
4498 }
4499 return NOTIFY_DONE;
4500 }
4501
4502 static struct notifier_block rtnetlink_dev_notifier = {
4503 .notifier_call = rtnetlink_event,
4504 };
4505
4506
4507 static int __net_init rtnetlink_net_init(struct net *net)
4508 {
4509 struct sock *sk;
4510 struct netlink_kernel_cfg cfg = {
4511 .groups = RTNLGRP_MAX,
4512 .input = rtnetlink_rcv,
4513 .cb_mutex = &rtnl_mutex,
4514 .flags = NL_CFG_F_NONROOT_RECV,
4515 .bind = rtnetlink_bind,
4516 };
4517
4518 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
4519 if (!sk)
4520 return -ENOMEM;
4521 net->rtnl = sk;
4522 return 0;
4523 }
4524
4525 static void __net_exit rtnetlink_net_exit(struct net *net)
4526 {
4527 netlink_kernel_release(net->rtnl);
4528 net->rtnl = NULL;
4529 }
4530
4531 static struct pernet_operations rtnetlink_net_ops = {
4532 .init = rtnetlink_net_init,
4533 .exit = rtnetlink_net_exit,
4534 };
4535
4536 void __init rtnetlink_init(void)
4537 {
4538 int i;
4539
4540 for (i = 0; i < ARRAY_SIZE(rtnl_msg_handlers_ref); i++)
4541 refcount_set(&rtnl_msg_handlers_ref[i], 1);
4542
4543 if (register_pernet_subsys(&rtnetlink_net_ops))
4544 panic("rtnetlink_init: cannot initialize rtnetlink\n");
4545
4546 register_netdevice_notifier(&rtnetlink_dev_notifier);
4547
4548 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
4549 rtnl_dump_ifinfo, 0);
4550 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
4551 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
4552 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
4553
4554 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
4555 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
4556 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
4557
4558 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
4559 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
4560 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, 0);
4561
4562 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
4563 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
4564 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
4565
4566 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
4567 0);
4568 }
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