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UBUNTU: Ubuntu-5.3.0-29.31
[mirror_ubuntu-eoan-kernel.git] / net / core / rtnetlink.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Routing netlink socket interface: protocol independent part.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 * Fixes:
12 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
13 */
14
15 #include <linux/bitops.h>
16 #include <linux/errno.h>
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/socket.h>
20 #include <linux/kernel.h>
21 #include <linux/timer.h>
22 #include <linux/string.h>
23 #include <linux/sockios.h>
24 #include <linux/net.h>
25 #include <linux/fcntl.h>
26 #include <linux/mm.h>
27 #include <linux/slab.h>
28 #include <linux/interrupt.h>
29 #include <linux/capability.h>
30 #include <linux/skbuff.h>
31 #include <linux/init.h>
32 #include <linux/security.h>
33 #include <linux/mutex.h>
34 #include <linux/if_addr.h>
35 #include <linux/if_bridge.h>
36 #include <linux/if_vlan.h>
37 #include <linux/pci.h>
38 #include <linux/etherdevice.h>
39 #include <linux/bpf.h>
40
41 #include <linux/uaccess.h>
42
43 #include <linux/inet.h>
44 #include <linux/netdevice.h>
45 #include <net/ip.h>
46 #include <net/protocol.h>
47 #include <net/arp.h>
48 #include <net/route.h>
49 #include <net/udp.h>
50 #include <net/tcp.h>
51 #include <net/sock.h>
52 #include <net/pkt_sched.h>
53 #include <net/fib_rules.h>
54 #include <net/rtnetlink.h>
55 #include <net/net_namespace.h>
56
57 #define RTNL_MAX_TYPE 50
58 #define RTNL_SLAVE_MAX_TYPE 36
59
60 struct rtnl_link {
61 rtnl_doit_func doit;
62 rtnl_dumpit_func dumpit;
63 struct module *owner;
64 unsigned int flags;
65 struct rcu_head rcu;
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 int rtnl_lock_killable(void)
77 {
78 return mutex_lock_killable(&rtnl_mutex);
79 }
80 EXPORT_SYMBOL(rtnl_lock_killable);
81
82 static struct sk_buff *defer_kfree_skb_list;
83 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
84 {
85 if (head && tail) {
86 tail->next = defer_kfree_skb_list;
87 defer_kfree_skb_list = head;
88 }
89 }
90 EXPORT_SYMBOL(rtnl_kfree_skbs);
91
92 void __rtnl_unlock(void)
93 {
94 struct sk_buff *head = defer_kfree_skb_list;
95
96 defer_kfree_skb_list = NULL;
97
98 mutex_unlock(&rtnl_mutex);
99
100 while (head) {
101 struct sk_buff *next = head->next;
102
103 kfree_skb(head);
104 cond_resched();
105 head = next;
106 }
107 }
108
109 void rtnl_unlock(void)
110 {
111 /* This fellow will unlock it for us. */
112 netdev_run_todo();
113 }
114 EXPORT_SYMBOL(rtnl_unlock);
115
116 int rtnl_trylock(void)
117 {
118 return mutex_trylock(&rtnl_mutex);
119 }
120 EXPORT_SYMBOL(rtnl_trylock);
121
122 int rtnl_is_locked(void)
123 {
124 return mutex_is_locked(&rtnl_mutex);
125 }
126 EXPORT_SYMBOL(rtnl_is_locked);
127
128 bool refcount_dec_and_rtnl_lock(refcount_t *r)
129 {
130 return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
131 }
132 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
133
134 #ifdef CONFIG_PROVE_LOCKING
135 bool lockdep_rtnl_is_held(void)
136 {
137 return lockdep_is_held(&rtnl_mutex);
138 }
139 EXPORT_SYMBOL(lockdep_rtnl_is_held);
140 #endif /* #ifdef CONFIG_PROVE_LOCKING */
141
142 static struct rtnl_link *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
143
144 static inline int rtm_msgindex(int msgtype)
145 {
146 int msgindex = msgtype - RTM_BASE;
147
148 /*
149 * msgindex < 0 implies someone tried to register a netlink
150 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
151 * the message type has not been added to linux/rtnetlink.h
152 */
153 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
154
155 return msgindex;
156 }
157
158 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
159 {
160 struct rtnl_link **tab;
161
162 if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
163 protocol = PF_UNSPEC;
164
165 tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
166 if (!tab)
167 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
168
169 return tab[msgtype];
170 }
171
172 static int rtnl_register_internal(struct module *owner,
173 int protocol, int msgtype,
174 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
175 unsigned int flags)
176 {
177 struct rtnl_link *link, *old;
178 struct rtnl_link __rcu **tab;
179 int msgindex;
180 int ret = -ENOBUFS;
181
182 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
183 msgindex = rtm_msgindex(msgtype);
184
185 rtnl_lock();
186 tab = rtnl_msg_handlers[protocol];
187 if (tab == NULL) {
188 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
189 if (!tab)
190 goto unlock;
191
192 /* ensures we see the 0 stores */
193 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
194 }
195
196 old = rtnl_dereference(tab[msgindex]);
197 if (old) {
198 link = kmemdup(old, sizeof(*old), GFP_KERNEL);
199 if (!link)
200 goto unlock;
201 } else {
202 link = kzalloc(sizeof(*link), GFP_KERNEL);
203 if (!link)
204 goto unlock;
205 }
206
207 WARN_ON(link->owner && link->owner != owner);
208 link->owner = owner;
209
210 WARN_ON(doit && link->doit && link->doit != doit);
211 if (doit)
212 link->doit = doit;
213 WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
214 if (dumpit)
215 link->dumpit = dumpit;
216
217 link->flags |= flags;
218
219 /* publish protocol:msgtype */
220 rcu_assign_pointer(tab[msgindex], link);
221 ret = 0;
222 if (old)
223 kfree_rcu(old, rcu);
224 unlock:
225 rtnl_unlock();
226 return ret;
227 }
228
229 /**
230 * rtnl_register_module - Register a rtnetlink message type
231 *
232 * @owner: module registering the hook (THIS_MODULE)
233 * @protocol: Protocol family or PF_UNSPEC
234 * @msgtype: rtnetlink message type
235 * @doit: Function pointer called for each request message
236 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
237 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
238 *
239 * Like rtnl_register, but for use by removable modules.
240 */
241 int rtnl_register_module(struct module *owner,
242 int protocol, int msgtype,
243 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
244 unsigned int flags)
245 {
246 return rtnl_register_internal(owner, protocol, msgtype,
247 doit, dumpit, flags);
248 }
249 EXPORT_SYMBOL_GPL(rtnl_register_module);
250
251 /**
252 * rtnl_register - Register a rtnetlink message type
253 * @protocol: Protocol family or PF_UNSPEC
254 * @msgtype: rtnetlink message type
255 * @doit: Function pointer called for each request message
256 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
257 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
258 *
259 * Registers the specified function pointers (at least one of them has
260 * to be non-NULL) to be called whenever a request message for the
261 * specified protocol family and message type is received.
262 *
263 * The special protocol family PF_UNSPEC may be used to define fallback
264 * function pointers for the case when no entry for the specific protocol
265 * family exists.
266 */
267 void rtnl_register(int protocol, int msgtype,
268 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
269 unsigned int flags)
270 {
271 int err;
272
273 err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
274 flags);
275 if (err)
276 pr_err("Unable to register rtnetlink message handler, "
277 "protocol = %d, message type = %d\n", protocol, msgtype);
278 }
279
280 /**
281 * rtnl_unregister - Unregister a rtnetlink message type
282 * @protocol: Protocol family or PF_UNSPEC
283 * @msgtype: rtnetlink message type
284 *
285 * Returns 0 on success or a negative error code.
286 */
287 int rtnl_unregister(int protocol, int msgtype)
288 {
289 struct rtnl_link **tab, *link;
290 int msgindex;
291
292 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
293 msgindex = rtm_msgindex(msgtype);
294
295 rtnl_lock();
296 tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
297 if (!tab) {
298 rtnl_unlock();
299 return -ENOENT;
300 }
301
302 link = tab[msgindex];
303 rcu_assign_pointer(tab[msgindex], NULL);
304 rtnl_unlock();
305
306 kfree_rcu(link, rcu);
307
308 return 0;
309 }
310 EXPORT_SYMBOL_GPL(rtnl_unregister);
311
312 /**
313 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
314 * @protocol : Protocol family or PF_UNSPEC
315 *
316 * Identical to calling rtnl_unregster() for all registered message types
317 * of a certain protocol family.
318 */
319 void rtnl_unregister_all(int protocol)
320 {
321 struct rtnl_link **tab, *link;
322 int msgindex;
323
324 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
325
326 rtnl_lock();
327 tab = rtnl_msg_handlers[protocol];
328 if (!tab) {
329 rtnl_unlock();
330 return;
331 }
332 RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
333 for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
334 link = tab[msgindex];
335 if (!link)
336 continue;
337
338 rcu_assign_pointer(tab[msgindex], NULL);
339 kfree_rcu(link, rcu);
340 }
341 rtnl_unlock();
342
343 synchronize_net();
344
345 kfree(tab);
346 }
347 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
348
349 static LIST_HEAD(link_ops);
350
351 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
352 {
353 const struct rtnl_link_ops *ops;
354
355 list_for_each_entry(ops, &link_ops, list) {
356 if (!strcmp(ops->kind, kind))
357 return ops;
358 }
359 return NULL;
360 }
361
362 /**
363 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
364 * @ops: struct rtnl_link_ops * to register
365 *
366 * The caller must hold the rtnl_mutex. This function should be used
367 * by drivers that create devices during module initialization. It
368 * must be called before registering the devices.
369 *
370 * Returns 0 on success or a negative error code.
371 */
372 int __rtnl_link_register(struct rtnl_link_ops *ops)
373 {
374 if (rtnl_link_ops_get(ops->kind))
375 return -EEXIST;
376
377 /* The check for setup is here because if ops
378 * does not have that filled up, it is not possible
379 * to use the ops for creating device. So do not
380 * fill up dellink as well. That disables rtnl_dellink.
381 */
382 if (ops->setup && !ops->dellink)
383 ops->dellink = unregister_netdevice_queue;
384
385 list_add_tail(&ops->list, &link_ops);
386 return 0;
387 }
388 EXPORT_SYMBOL_GPL(__rtnl_link_register);
389
390 /**
391 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
392 * @ops: struct rtnl_link_ops * to register
393 *
394 * Returns 0 on success or a negative error code.
395 */
396 int rtnl_link_register(struct rtnl_link_ops *ops)
397 {
398 int err;
399
400 /* Sanity-check max sizes to avoid stack buffer overflow. */
401 if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
402 ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
403 return -EINVAL;
404
405 rtnl_lock();
406 err = __rtnl_link_register(ops);
407 rtnl_unlock();
408 return err;
409 }
410 EXPORT_SYMBOL_GPL(rtnl_link_register);
411
412 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
413 {
414 struct net_device *dev;
415 LIST_HEAD(list_kill);
416
417 for_each_netdev(net, dev) {
418 if (dev->rtnl_link_ops == ops)
419 ops->dellink(dev, &list_kill);
420 }
421 unregister_netdevice_many(&list_kill);
422 }
423
424 /**
425 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
426 * @ops: struct rtnl_link_ops * to unregister
427 *
428 * The caller must hold the rtnl_mutex and guarantee net_namespace_list
429 * integrity (hold pernet_ops_rwsem for writing to close the race
430 * with setup_net() and cleanup_net()).
431 */
432 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
433 {
434 struct net *net;
435
436 for_each_net(net) {
437 __rtnl_kill_links(net, ops);
438 }
439 list_del(&ops->list);
440 }
441 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
442
443 /* Return with the rtnl_lock held when there are no network
444 * devices unregistering in any network namespace.
445 */
446 static void rtnl_lock_unregistering_all(void)
447 {
448 struct net *net;
449 bool unregistering;
450 DEFINE_WAIT_FUNC(wait, woken_wake_function);
451
452 add_wait_queue(&netdev_unregistering_wq, &wait);
453 for (;;) {
454 unregistering = false;
455 rtnl_lock();
456 /* We held write locked pernet_ops_rwsem, and parallel
457 * setup_net() and cleanup_net() are not possible.
458 */
459 for_each_net(net) {
460 if (net->dev_unreg_count > 0) {
461 unregistering = true;
462 break;
463 }
464 }
465 if (!unregistering)
466 break;
467 __rtnl_unlock();
468
469 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
470 }
471 remove_wait_queue(&netdev_unregistering_wq, &wait);
472 }
473
474 /**
475 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
476 * @ops: struct rtnl_link_ops * to unregister
477 */
478 void rtnl_link_unregister(struct rtnl_link_ops *ops)
479 {
480 /* Close the race with setup_net() and cleanup_net() */
481 down_write(&pernet_ops_rwsem);
482 rtnl_lock_unregistering_all();
483 __rtnl_link_unregister(ops);
484 rtnl_unlock();
485 up_write(&pernet_ops_rwsem);
486 }
487 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
488
489 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
490 {
491 struct net_device *master_dev;
492 const struct rtnl_link_ops *ops;
493 size_t size = 0;
494
495 rcu_read_lock();
496
497 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
498 if (!master_dev)
499 goto out;
500
501 ops = master_dev->rtnl_link_ops;
502 if (!ops || !ops->get_slave_size)
503 goto out;
504 /* IFLA_INFO_SLAVE_DATA + nested data */
505 size = nla_total_size(sizeof(struct nlattr)) +
506 ops->get_slave_size(master_dev, dev);
507
508 out:
509 rcu_read_unlock();
510 return size;
511 }
512
513 static size_t rtnl_link_get_size(const struct net_device *dev)
514 {
515 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
516 size_t size;
517
518 if (!ops)
519 return 0;
520
521 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
522 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
523
524 if (ops->get_size)
525 /* IFLA_INFO_DATA + nested data */
526 size += nla_total_size(sizeof(struct nlattr)) +
527 ops->get_size(dev);
528
529 if (ops->get_xstats_size)
530 /* IFLA_INFO_XSTATS */
531 size += nla_total_size(ops->get_xstats_size(dev));
532
533 size += rtnl_link_get_slave_info_data_size(dev);
534
535 return size;
536 }
537
538 static LIST_HEAD(rtnl_af_ops);
539
540 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
541 {
542 const struct rtnl_af_ops *ops;
543
544 list_for_each_entry_rcu(ops, &rtnl_af_ops, list) {
545 if (ops->family == family)
546 return ops;
547 }
548
549 return NULL;
550 }
551
552 /**
553 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
554 * @ops: struct rtnl_af_ops * to register
555 *
556 * Returns 0 on success or a negative error code.
557 */
558 void rtnl_af_register(struct rtnl_af_ops *ops)
559 {
560 rtnl_lock();
561 list_add_tail_rcu(&ops->list, &rtnl_af_ops);
562 rtnl_unlock();
563 }
564 EXPORT_SYMBOL_GPL(rtnl_af_register);
565
566 /**
567 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
568 * @ops: struct rtnl_af_ops * to unregister
569 */
570 void rtnl_af_unregister(struct rtnl_af_ops *ops)
571 {
572 rtnl_lock();
573 list_del_rcu(&ops->list);
574 rtnl_unlock();
575
576 synchronize_rcu();
577 }
578 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
579
580 static size_t rtnl_link_get_af_size(const struct net_device *dev,
581 u32 ext_filter_mask)
582 {
583 struct rtnl_af_ops *af_ops;
584 size_t size;
585
586 /* IFLA_AF_SPEC */
587 size = nla_total_size(sizeof(struct nlattr));
588
589 rcu_read_lock();
590 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
591 if (af_ops->get_link_af_size) {
592 /* AF_* + nested data */
593 size += nla_total_size(sizeof(struct nlattr)) +
594 af_ops->get_link_af_size(dev, ext_filter_mask);
595 }
596 }
597 rcu_read_unlock();
598
599 return size;
600 }
601
602 static bool rtnl_have_link_slave_info(const struct net_device *dev)
603 {
604 struct net_device *master_dev;
605 bool ret = false;
606
607 rcu_read_lock();
608
609 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
610 if (master_dev && master_dev->rtnl_link_ops)
611 ret = true;
612 rcu_read_unlock();
613 return ret;
614 }
615
616 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
617 const struct net_device *dev)
618 {
619 struct net_device *master_dev;
620 const struct rtnl_link_ops *ops;
621 struct nlattr *slave_data;
622 int err;
623
624 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
625 if (!master_dev)
626 return 0;
627 ops = master_dev->rtnl_link_ops;
628 if (!ops)
629 return 0;
630 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
631 return -EMSGSIZE;
632 if (ops->fill_slave_info) {
633 slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA);
634 if (!slave_data)
635 return -EMSGSIZE;
636 err = ops->fill_slave_info(skb, master_dev, dev);
637 if (err < 0)
638 goto err_cancel_slave_data;
639 nla_nest_end(skb, slave_data);
640 }
641 return 0;
642
643 err_cancel_slave_data:
644 nla_nest_cancel(skb, slave_data);
645 return err;
646 }
647
648 static int rtnl_link_info_fill(struct sk_buff *skb,
649 const struct net_device *dev)
650 {
651 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
652 struct nlattr *data;
653 int err;
654
655 if (!ops)
656 return 0;
657 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
658 return -EMSGSIZE;
659 if (ops->fill_xstats) {
660 err = ops->fill_xstats(skb, dev);
661 if (err < 0)
662 return err;
663 }
664 if (ops->fill_info) {
665 data = nla_nest_start_noflag(skb, IFLA_INFO_DATA);
666 if (data == NULL)
667 return -EMSGSIZE;
668 err = ops->fill_info(skb, dev);
669 if (err < 0)
670 goto err_cancel_data;
671 nla_nest_end(skb, data);
672 }
673 return 0;
674
675 err_cancel_data:
676 nla_nest_cancel(skb, data);
677 return err;
678 }
679
680 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
681 {
682 struct nlattr *linkinfo;
683 int err = -EMSGSIZE;
684
685 linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO);
686 if (linkinfo == NULL)
687 goto out;
688
689 err = rtnl_link_info_fill(skb, dev);
690 if (err < 0)
691 goto err_cancel_link;
692
693 err = rtnl_link_slave_info_fill(skb, dev);
694 if (err < 0)
695 goto err_cancel_link;
696
697 nla_nest_end(skb, linkinfo);
698 return 0;
699
700 err_cancel_link:
701 nla_nest_cancel(skb, linkinfo);
702 out:
703 return err;
704 }
705
706 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
707 {
708 struct sock *rtnl = net->rtnl;
709 int err = 0;
710
711 NETLINK_CB(skb).dst_group = group;
712 if (echo)
713 refcount_inc(&skb->users);
714 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
715 if (echo)
716 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
717 return err;
718 }
719
720 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
721 {
722 struct sock *rtnl = net->rtnl;
723
724 return nlmsg_unicast(rtnl, skb, pid);
725 }
726 EXPORT_SYMBOL(rtnl_unicast);
727
728 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
729 struct nlmsghdr *nlh, gfp_t flags)
730 {
731 struct sock *rtnl = net->rtnl;
732 int report = 0;
733
734 if (nlh)
735 report = nlmsg_report(nlh);
736
737 nlmsg_notify(rtnl, skb, pid, group, report, flags);
738 }
739 EXPORT_SYMBOL(rtnl_notify);
740
741 void rtnl_set_sk_err(struct net *net, u32 group, int error)
742 {
743 struct sock *rtnl = net->rtnl;
744
745 netlink_set_err(rtnl, 0, group, error);
746 }
747 EXPORT_SYMBOL(rtnl_set_sk_err);
748
749 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
750 {
751 struct nlattr *mx;
752 int i, valid = 0;
753
754 /* nothing is dumped for dst_default_metrics, so just skip the loop */
755 if (metrics == dst_default_metrics.metrics)
756 return 0;
757
758 mx = nla_nest_start_noflag(skb, RTA_METRICS);
759 if (mx == NULL)
760 return -ENOBUFS;
761
762 for (i = 0; i < RTAX_MAX; i++) {
763 if (metrics[i]) {
764 if (i == RTAX_CC_ALGO - 1) {
765 char tmp[TCP_CA_NAME_MAX], *name;
766
767 name = tcp_ca_get_name_by_key(metrics[i], tmp);
768 if (!name)
769 continue;
770 if (nla_put_string(skb, i + 1, name))
771 goto nla_put_failure;
772 } else if (i == RTAX_FEATURES - 1) {
773 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
774
775 if (!user_features)
776 continue;
777 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
778 if (nla_put_u32(skb, i + 1, user_features))
779 goto nla_put_failure;
780 } else {
781 if (nla_put_u32(skb, i + 1, metrics[i]))
782 goto nla_put_failure;
783 }
784 valid++;
785 }
786 }
787
788 if (!valid) {
789 nla_nest_cancel(skb, mx);
790 return 0;
791 }
792
793 return nla_nest_end(skb, mx);
794
795 nla_put_failure:
796 nla_nest_cancel(skb, mx);
797 return -EMSGSIZE;
798 }
799 EXPORT_SYMBOL(rtnetlink_put_metrics);
800
801 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
802 long expires, u32 error)
803 {
804 struct rta_cacheinfo ci = {
805 .rta_error = error,
806 .rta_id = id,
807 };
808
809 if (dst) {
810 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
811 ci.rta_used = dst->__use;
812 ci.rta_clntref = atomic_read(&dst->__refcnt);
813 }
814 if (expires) {
815 unsigned long clock;
816
817 clock = jiffies_to_clock_t(abs(expires));
818 clock = min_t(unsigned long, clock, INT_MAX);
819 ci.rta_expires = (expires > 0) ? clock : -clock;
820 }
821 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
822 }
823 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
824
825 static void set_operstate(struct net_device *dev, unsigned char transition)
826 {
827 unsigned char operstate = dev->operstate;
828
829 switch (transition) {
830 case IF_OPER_UP:
831 if ((operstate == IF_OPER_DORMANT ||
832 operstate == IF_OPER_UNKNOWN) &&
833 !netif_dormant(dev))
834 operstate = IF_OPER_UP;
835 break;
836
837 case IF_OPER_DORMANT:
838 if (operstate == IF_OPER_UP ||
839 operstate == IF_OPER_UNKNOWN)
840 operstate = IF_OPER_DORMANT;
841 break;
842 }
843
844 if (dev->operstate != operstate) {
845 write_lock_bh(&dev_base_lock);
846 dev->operstate = operstate;
847 write_unlock_bh(&dev_base_lock);
848 netdev_state_change(dev);
849 }
850 }
851
852 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
853 {
854 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
855 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
856 }
857
858 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
859 const struct ifinfomsg *ifm)
860 {
861 unsigned int flags = ifm->ifi_flags;
862
863 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
864 if (ifm->ifi_change)
865 flags = (flags & ifm->ifi_change) |
866 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
867
868 return flags;
869 }
870
871 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
872 const struct rtnl_link_stats64 *b)
873 {
874 a->rx_packets = b->rx_packets;
875 a->tx_packets = b->tx_packets;
876 a->rx_bytes = b->rx_bytes;
877 a->tx_bytes = b->tx_bytes;
878 a->rx_errors = b->rx_errors;
879 a->tx_errors = b->tx_errors;
880 a->rx_dropped = b->rx_dropped;
881 a->tx_dropped = b->tx_dropped;
882
883 a->multicast = b->multicast;
884 a->collisions = b->collisions;
885
886 a->rx_length_errors = b->rx_length_errors;
887 a->rx_over_errors = b->rx_over_errors;
888 a->rx_crc_errors = b->rx_crc_errors;
889 a->rx_frame_errors = b->rx_frame_errors;
890 a->rx_fifo_errors = b->rx_fifo_errors;
891 a->rx_missed_errors = b->rx_missed_errors;
892
893 a->tx_aborted_errors = b->tx_aborted_errors;
894 a->tx_carrier_errors = b->tx_carrier_errors;
895 a->tx_fifo_errors = b->tx_fifo_errors;
896 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
897 a->tx_window_errors = b->tx_window_errors;
898
899 a->rx_compressed = b->rx_compressed;
900 a->tx_compressed = b->tx_compressed;
901
902 a->rx_nohandler = b->rx_nohandler;
903 }
904
905 /* All VF info */
906 static inline int rtnl_vfinfo_size(const struct net_device *dev,
907 u32 ext_filter_mask)
908 {
909 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
910 int num_vfs = dev_num_vf(dev->dev.parent);
911 size_t size = nla_total_size(0);
912 size += num_vfs *
913 (nla_total_size(0) +
914 nla_total_size(sizeof(struct ifla_vf_mac)) +
915 nla_total_size(sizeof(struct ifla_vf_broadcast)) +
916 nla_total_size(sizeof(struct ifla_vf_vlan)) +
917 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
918 nla_total_size(MAX_VLAN_LIST_LEN *
919 sizeof(struct ifla_vf_vlan_info)) +
920 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
921 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
922 nla_total_size(sizeof(struct ifla_vf_rate)) +
923 nla_total_size(sizeof(struct ifla_vf_link_state)) +
924 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
925 nla_total_size(0) + /* nest IFLA_VF_STATS */
926 /* IFLA_VF_STATS_RX_PACKETS */
927 nla_total_size_64bit(sizeof(__u64)) +
928 /* IFLA_VF_STATS_TX_PACKETS */
929 nla_total_size_64bit(sizeof(__u64)) +
930 /* IFLA_VF_STATS_RX_BYTES */
931 nla_total_size_64bit(sizeof(__u64)) +
932 /* IFLA_VF_STATS_TX_BYTES */
933 nla_total_size_64bit(sizeof(__u64)) +
934 /* IFLA_VF_STATS_BROADCAST */
935 nla_total_size_64bit(sizeof(__u64)) +
936 /* IFLA_VF_STATS_MULTICAST */
937 nla_total_size_64bit(sizeof(__u64)) +
938 /* IFLA_VF_STATS_RX_DROPPED */
939 nla_total_size_64bit(sizeof(__u64)) +
940 /* IFLA_VF_STATS_TX_DROPPED */
941 nla_total_size_64bit(sizeof(__u64)) +
942 nla_total_size(sizeof(struct ifla_vf_trust)));
943 return size;
944 } else
945 return 0;
946 }
947
948 static size_t rtnl_port_size(const struct net_device *dev,
949 u32 ext_filter_mask)
950 {
951 size_t port_size = nla_total_size(4) /* PORT_VF */
952 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
953 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
954 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
955 + nla_total_size(1) /* PROT_VDP_REQUEST */
956 + nla_total_size(2); /* PORT_VDP_RESPONSE */
957 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
958 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
959 + port_size;
960 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
961 + port_size;
962
963 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
964 !(ext_filter_mask & RTEXT_FILTER_VF))
965 return 0;
966 if (dev_num_vf(dev->dev.parent))
967 return port_self_size + vf_ports_size +
968 vf_port_size * dev_num_vf(dev->dev.parent);
969 else
970 return port_self_size;
971 }
972
973 static size_t rtnl_xdp_size(void)
974 {
975 size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */
976 nla_total_size(1) + /* XDP_ATTACHED */
977 nla_total_size(4) + /* XDP_PROG_ID (or 1st mode) */
978 nla_total_size(4); /* XDP_<mode>_PROG_ID */
979
980 return xdp_size;
981 }
982
983 static noinline size_t if_nlmsg_size(const struct net_device *dev,
984 u32 ext_filter_mask)
985 {
986 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
987 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
988 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
989 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
990 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
991 + nla_total_size(sizeof(struct rtnl_link_stats))
992 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
993 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
994 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
995 + nla_total_size(4) /* IFLA_TXQLEN */
996 + nla_total_size(4) /* IFLA_WEIGHT */
997 + nla_total_size(4) /* IFLA_MTU */
998 + nla_total_size(4) /* IFLA_LINK */
999 + nla_total_size(4) /* IFLA_MASTER */
1000 + nla_total_size(1) /* IFLA_CARRIER */
1001 + nla_total_size(4) /* IFLA_PROMISCUITY */
1002 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1003 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1004 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1005 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1006 + nla_total_size(1) /* IFLA_OPERSTATE */
1007 + nla_total_size(1) /* IFLA_LINKMODE */
1008 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1009 + nla_total_size(4) /* IFLA_LINK_NETNSID */
1010 + nla_total_size(4) /* IFLA_GROUP */
1011 + nla_total_size(ext_filter_mask
1012 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1013 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1014 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1015 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1016 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1017 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1018 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1019 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1020 + rtnl_xdp_size() /* IFLA_XDP */
1021 + nla_total_size(4) /* IFLA_EVENT */
1022 + nla_total_size(4) /* IFLA_NEW_NETNSID */
1023 + nla_total_size(4) /* IFLA_NEW_IFINDEX */
1024 + nla_total_size(1) /* IFLA_PROTO_DOWN */
1025 + nla_total_size(4) /* IFLA_TARGET_NETNSID */
1026 + nla_total_size(4) /* IFLA_CARRIER_UP_COUNT */
1027 + nla_total_size(4) /* IFLA_CARRIER_DOWN_COUNT */
1028 + nla_total_size(4) /* IFLA_MIN_MTU */
1029 + nla_total_size(4) /* IFLA_MAX_MTU */
1030 + 0;
1031 }
1032
1033 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1034 {
1035 struct nlattr *vf_ports;
1036 struct nlattr *vf_port;
1037 int vf;
1038 int err;
1039
1040 vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
1041 if (!vf_ports)
1042 return -EMSGSIZE;
1043
1044 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1045 vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
1046 if (!vf_port)
1047 goto nla_put_failure;
1048 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1049 goto nla_put_failure;
1050 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1051 if (err == -EMSGSIZE)
1052 goto nla_put_failure;
1053 if (err) {
1054 nla_nest_cancel(skb, vf_port);
1055 continue;
1056 }
1057 nla_nest_end(skb, vf_port);
1058 }
1059
1060 nla_nest_end(skb, vf_ports);
1061
1062 return 0;
1063
1064 nla_put_failure:
1065 nla_nest_cancel(skb, vf_ports);
1066 return -EMSGSIZE;
1067 }
1068
1069 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1070 {
1071 struct nlattr *port_self;
1072 int err;
1073
1074 port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
1075 if (!port_self)
1076 return -EMSGSIZE;
1077
1078 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1079 if (err) {
1080 nla_nest_cancel(skb, port_self);
1081 return (err == -EMSGSIZE) ? err : 0;
1082 }
1083
1084 nla_nest_end(skb, port_self);
1085
1086 return 0;
1087 }
1088
1089 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1090 u32 ext_filter_mask)
1091 {
1092 int err;
1093
1094 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1095 !(ext_filter_mask & RTEXT_FILTER_VF))
1096 return 0;
1097
1098 err = rtnl_port_self_fill(skb, dev);
1099 if (err)
1100 return err;
1101
1102 if (dev_num_vf(dev->dev.parent)) {
1103 err = rtnl_vf_ports_fill(skb, dev);
1104 if (err)
1105 return err;
1106 }
1107
1108 return 0;
1109 }
1110
1111 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1112 {
1113 int err;
1114 struct netdev_phys_item_id ppid;
1115
1116 err = dev_get_phys_port_id(dev, &ppid);
1117 if (err) {
1118 if (err == -EOPNOTSUPP)
1119 return 0;
1120 return err;
1121 }
1122
1123 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1124 return -EMSGSIZE;
1125
1126 return 0;
1127 }
1128
1129 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1130 {
1131 char name[IFNAMSIZ];
1132 int err;
1133
1134 err = dev_get_phys_port_name(dev, name, sizeof(name));
1135 if (err) {
1136 if (err == -EOPNOTSUPP)
1137 return 0;
1138 return err;
1139 }
1140
1141 if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1142 return -EMSGSIZE;
1143
1144 return 0;
1145 }
1146
1147 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1148 {
1149 struct netdev_phys_item_id ppid = { };
1150 int err;
1151
1152 err = dev_get_port_parent_id(dev, &ppid, false);
1153 if (err) {
1154 if (err == -EOPNOTSUPP)
1155 return 0;
1156 return err;
1157 }
1158
1159 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
1160 return -EMSGSIZE;
1161
1162 return 0;
1163 }
1164
1165 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1166 struct net_device *dev)
1167 {
1168 struct rtnl_link_stats64 *sp;
1169 struct nlattr *attr;
1170
1171 attr = nla_reserve_64bit(skb, IFLA_STATS64,
1172 sizeof(struct rtnl_link_stats64), IFLA_PAD);
1173 if (!attr)
1174 return -EMSGSIZE;
1175
1176 sp = nla_data(attr);
1177 dev_get_stats(dev, sp);
1178
1179 attr = nla_reserve(skb, IFLA_STATS,
1180 sizeof(struct rtnl_link_stats));
1181 if (!attr)
1182 return -EMSGSIZE;
1183
1184 copy_rtnl_link_stats(nla_data(attr), sp);
1185
1186 return 0;
1187 }
1188
1189 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1190 struct net_device *dev,
1191 int vfs_num,
1192 struct nlattr *vfinfo)
1193 {
1194 struct ifla_vf_rss_query_en vf_rss_query_en;
1195 struct nlattr *vf, *vfstats, *vfvlanlist;
1196 struct ifla_vf_link_state vf_linkstate;
1197 struct ifla_vf_vlan_info vf_vlan_info;
1198 struct ifla_vf_spoofchk vf_spoofchk;
1199 struct ifla_vf_tx_rate vf_tx_rate;
1200 struct ifla_vf_stats vf_stats;
1201 struct ifla_vf_trust vf_trust;
1202 struct ifla_vf_vlan vf_vlan;
1203 struct ifla_vf_rate vf_rate;
1204 struct ifla_vf_mac vf_mac;
1205 struct ifla_vf_broadcast vf_broadcast;
1206 struct ifla_vf_info ivi;
1207
1208 memset(&ivi, 0, sizeof(ivi));
1209
1210 /* Not all SR-IOV capable drivers support the
1211 * spoofcheck and "RSS query enable" query. Preset to
1212 * -1 so the user space tool can detect that the driver
1213 * didn't report anything.
1214 */
1215 ivi.spoofchk = -1;
1216 ivi.rss_query_en = -1;
1217 ivi.trusted = -1;
1218 /* The default value for VF link state is "auto"
1219 * IFLA_VF_LINK_STATE_AUTO which equals zero
1220 */
1221 ivi.linkstate = 0;
1222 /* VLAN Protocol by default is 802.1Q */
1223 ivi.vlan_proto = htons(ETH_P_8021Q);
1224 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1225 return 0;
1226
1227 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1228
1229 vf_mac.vf =
1230 vf_vlan.vf =
1231 vf_vlan_info.vf =
1232 vf_rate.vf =
1233 vf_tx_rate.vf =
1234 vf_spoofchk.vf =
1235 vf_linkstate.vf =
1236 vf_rss_query_en.vf =
1237 vf_trust.vf = ivi.vf;
1238
1239 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1240 memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
1241 vf_vlan.vlan = ivi.vlan;
1242 vf_vlan.qos = ivi.qos;
1243 vf_vlan_info.vlan = ivi.vlan;
1244 vf_vlan_info.qos = ivi.qos;
1245 vf_vlan_info.vlan_proto = ivi.vlan_proto;
1246 vf_tx_rate.rate = ivi.max_tx_rate;
1247 vf_rate.min_tx_rate = ivi.min_tx_rate;
1248 vf_rate.max_tx_rate = ivi.max_tx_rate;
1249 vf_spoofchk.setting = ivi.spoofchk;
1250 vf_linkstate.link_state = ivi.linkstate;
1251 vf_rss_query_en.setting = ivi.rss_query_en;
1252 vf_trust.setting = ivi.trusted;
1253 vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1254 if (!vf)
1255 goto nla_put_vfinfo_failure;
1256 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1257 nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
1258 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1259 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1260 &vf_rate) ||
1261 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1262 &vf_tx_rate) ||
1263 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1264 &vf_spoofchk) ||
1265 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1266 &vf_linkstate) ||
1267 nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1268 sizeof(vf_rss_query_en),
1269 &vf_rss_query_en) ||
1270 nla_put(skb, IFLA_VF_TRUST,
1271 sizeof(vf_trust), &vf_trust))
1272 goto nla_put_vf_failure;
1273 vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1274 if (!vfvlanlist)
1275 goto nla_put_vf_failure;
1276 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1277 &vf_vlan_info)) {
1278 nla_nest_cancel(skb, vfvlanlist);
1279 goto nla_put_vf_failure;
1280 }
1281 nla_nest_end(skb, vfvlanlist);
1282 memset(&vf_stats, 0, sizeof(vf_stats));
1283 if (dev->netdev_ops->ndo_get_vf_stats)
1284 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1285 &vf_stats);
1286 vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1287 if (!vfstats)
1288 goto nla_put_vf_failure;
1289 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1290 vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1291 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1292 vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1293 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1294 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1295 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1296 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1297 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1298 vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1299 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1300 vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1301 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1302 vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1303 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1304 vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1305 nla_nest_cancel(skb, vfstats);
1306 goto nla_put_vf_failure;
1307 }
1308 nla_nest_end(skb, vfstats);
1309 nla_nest_end(skb, vf);
1310 return 0;
1311
1312 nla_put_vf_failure:
1313 nla_nest_cancel(skb, vf);
1314 nla_put_vfinfo_failure:
1315 nla_nest_cancel(skb, vfinfo);
1316 return -EMSGSIZE;
1317 }
1318
1319 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1320 struct net_device *dev,
1321 u32 ext_filter_mask)
1322 {
1323 struct nlattr *vfinfo;
1324 int i, num_vfs;
1325
1326 if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1327 return 0;
1328
1329 num_vfs = dev_num_vf(dev->dev.parent);
1330 if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1331 return -EMSGSIZE;
1332
1333 if (!dev->netdev_ops->ndo_get_vf_config)
1334 return 0;
1335
1336 vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1337 if (!vfinfo)
1338 return -EMSGSIZE;
1339
1340 for (i = 0; i < num_vfs; i++) {
1341 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1342 return -EMSGSIZE;
1343 }
1344
1345 nla_nest_end(skb, vfinfo);
1346 return 0;
1347 }
1348
1349 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1350 {
1351 struct rtnl_link_ifmap map;
1352
1353 memset(&map, 0, sizeof(map));
1354 map.mem_start = dev->mem_start;
1355 map.mem_end = dev->mem_end;
1356 map.base_addr = dev->base_addr;
1357 map.irq = dev->irq;
1358 map.dma = dev->dma;
1359 map.port = dev->if_port;
1360
1361 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1362 return -EMSGSIZE;
1363
1364 return 0;
1365 }
1366
1367 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1368 {
1369 const struct bpf_prog *generic_xdp_prog;
1370
1371 ASSERT_RTNL();
1372
1373 generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1374 if (!generic_xdp_prog)
1375 return 0;
1376 return generic_xdp_prog->aux->id;
1377 }
1378
1379 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1380 {
1381 return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf, XDP_QUERY_PROG);
1382 }
1383
1384 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1385 {
1386 return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf,
1387 XDP_QUERY_PROG_HW);
1388 }
1389
1390 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1391 u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1392 u32 (*get_prog_id)(struct net_device *dev))
1393 {
1394 u32 curr_id;
1395 int err;
1396
1397 curr_id = get_prog_id(dev);
1398 if (!curr_id)
1399 return 0;
1400
1401 *prog_id = curr_id;
1402 err = nla_put_u32(skb, attr, curr_id);
1403 if (err)
1404 return err;
1405
1406 if (*mode != XDP_ATTACHED_NONE)
1407 *mode = XDP_ATTACHED_MULTI;
1408 else
1409 *mode = tgt_mode;
1410
1411 return 0;
1412 }
1413
1414 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1415 {
1416 struct nlattr *xdp;
1417 u32 prog_id;
1418 int err;
1419 u8 mode;
1420
1421 xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1422 if (!xdp)
1423 return -EMSGSIZE;
1424
1425 prog_id = 0;
1426 mode = XDP_ATTACHED_NONE;
1427 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1428 IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1429 if (err)
1430 goto err_cancel;
1431 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1432 IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1433 if (err)
1434 goto err_cancel;
1435 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1436 IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1437 if (err)
1438 goto err_cancel;
1439
1440 err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1441 if (err)
1442 goto err_cancel;
1443
1444 if (prog_id && mode != XDP_ATTACHED_MULTI) {
1445 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1446 if (err)
1447 goto err_cancel;
1448 }
1449
1450 nla_nest_end(skb, xdp);
1451 return 0;
1452
1453 err_cancel:
1454 nla_nest_cancel(skb, xdp);
1455 return err;
1456 }
1457
1458 static u32 rtnl_get_event(unsigned long event)
1459 {
1460 u32 rtnl_event_type = IFLA_EVENT_NONE;
1461
1462 switch (event) {
1463 case NETDEV_REBOOT:
1464 rtnl_event_type = IFLA_EVENT_REBOOT;
1465 break;
1466 case NETDEV_FEAT_CHANGE:
1467 rtnl_event_type = IFLA_EVENT_FEATURES;
1468 break;
1469 case NETDEV_BONDING_FAILOVER:
1470 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1471 break;
1472 case NETDEV_NOTIFY_PEERS:
1473 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1474 break;
1475 case NETDEV_RESEND_IGMP:
1476 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1477 break;
1478 case NETDEV_CHANGEINFODATA:
1479 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1480 break;
1481 default:
1482 break;
1483 }
1484
1485 return rtnl_event_type;
1486 }
1487
1488 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1489 {
1490 const struct net_device *upper_dev;
1491 int ret = 0;
1492
1493 rcu_read_lock();
1494
1495 upper_dev = netdev_master_upper_dev_get_rcu(dev);
1496 if (upper_dev)
1497 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1498
1499 rcu_read_unlock();
1500 return ret;
1501 }
1502
1503 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1504 bool force)
1505 {
1506 int ifindex = dev_get_iflink(dev);
1507
1508 if (force || dev->ifindex != ifindex)
1509 return nla_put_u32(skb, IFLA_LINK, ifindex);
1510
1511 return 0;
1512 }
1513
1514 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1515 struct net_device *dev)
1516 {
1517 char buf[IFALIASZ];
1518 int ret;
1519
1520 ret = dev_get_alias(dev, buf, sizeof(buf));
1521 return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1522 }
1523
1524 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1525 const struct net_device *dev,
1526 struct net *src_net, gfp_t gfp)
1527 {
1528 bool put_iflink = false;
1529
1530 if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1531 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1532
1533 if (!net_eq(dev_net(dev), link_net)) {
1534 int id = peernet2id_alloc(src_net, link_net, gfp);
1535
1536 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1537 return -EMSGSIZE;
1538
1539 put_iflink = true;
1540 }
1541 }
1542
1543 return nla_put_iflink(skb, dev, put_iflink);
1544 }
1545
1546 static int rtnl_fill_link_af(struct sk_buff *skb,
1547 const struct net_device *dev,
1548 u32 ext_filter_mask)
1549 {
1550 const struct rtnl_af_ops *af_ops;
1551 struct nlattr *af_spec;
1552
1553 af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1554 if (!af_spec)
1555 return -EMSGSIZE;
1556
1557 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1558 struct nlattr *af;
1559 int err;
1560
1561 if (!af_ops->fill_link_af)
1562 continue;
1563
1564 af = nla_nest_start_noflag(skb, af_ops->family);
1565 if (!af)
1566 return -EMSGSIZE;
1567
1568 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1569 /*
1570 * Caller may return ENODATA to indicate that there
1571 * was no data to be dumped. This is not an error, it
1572 * means we should trim the attribute header and
1573 * continue.
1574 */
1575 if (err == -ENODATA)
1576 nla_nest_cancel(skb, af);
1577 else if (err < 0)
1578 return -EMSGSIZE;
1579
1580 nla_nest_end(skb, af);
1581 }
1582
1583 nla_nest_end(skb, af_spec);
1584 return 0;
1585 }
1586
1587 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1588 struct net_device *dev, struct net *src_net,
1589 int type, u32 pid, u32 seq, u32 change,
1590 unsigned int flags, u32 ext_filter_mask,
1591 u32 event, int *new_nsid, int new_ifindex,
1592 int tgt_netnsid, gfp_t gfp)
1593 {
1594 struct ifinfomsg *ifm;
1595 struct nlmsghdr *nlh;
1596
1597 ASSERT_RTNL();
1598 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1599 if (nlh == NULL)
1600 return -EMSGSIZE;
1601
1602 ifm = nlmsg_data(nlh);
1603 ifm->ifi_family = AF_UNSPEC;
1604 ifm->__ifi_pad = 0;
1605 ifm->ifi_type = dev->type;
1606 ifm->ifi_index = dev->ifindex;
1607 ifm->ifi_flags = dev_get_flags(dev);
1608 ifm->ifi_change = change;
1609
1610 if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1611 goto nla_put_failure;
1612
1613 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1614 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1615 nla_put_u8(skb, IFLA_OPERSTATE,
1616 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1617 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1618 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1619 nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1620 nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1621 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1622 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1623 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1624 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1625 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1626 #ifdef CONFIG_RPS
1627 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1628 #endif
1629 put_master_ifindex(skb, dev) ||
1630 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1631 (dev->qdisc &&
1632 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1633 nla_put_ifalias(skb, dev) ||
1634 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1635 atomic_read(&dev->carrier_up_count) +
1636 atomic_read(&dev->carrier_down_count)) ||
1637 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down) ||
1638 nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1639 atomic_read(&dev->carrier_up_count)) ||
1640 nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1641 atomic_read(&dev->carrier_down_count)))
1642 goto nla_put_failure;
1643
1644 if (event != IFLA_EVENT_NONE) {
1645 if (nla_put_u32(skb, IFLA_EVENT, event))
1646 goto nla_put_failure;
1647 }
1648
1649 if (rtnl_fill_link_ifmap(skb, dev))
1650 goto nla_put_failure;
1651
1652 if (dev->addr_len) {
1653 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1654 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1655 goto nla_put_failure;
1656 }
1657
1658 if (rtnl_phys_port_id_fill(skb, dev))
1659 goto nla_put_failure;
1660
1661 if (rtnl_phys_port_name_fill(skb, dev))
1662 goto nla_put_failure;
1663
1664 if (rtnl_phys_switch_id_fill(skb, dev))
1665 goto nla_put_failure;
1666
1667 if (rtnl_fill_stats(skb, dev))
1668 goto nla_put_failure;
1669
1670 if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1671 goto nla_put_failure;
1672
1673 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1674 goto nla_put_failure;
1675
1676 if (rtnl_xdp_fill(skb, dev))
1677 goto nla_put_failure;
1678
1679 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1680 if (rtnl_link_fill(skb, dev) < 0)
1681 goto nla_put_failure;
1682 }
1683
1684 if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1685 goto nla_put_failure;
1686
1687 if (new_nsid &&
1688 nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1689 goto nla_put_failure;
1690 if (new_ifindex &&
1691 nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1692 goto nla_put_failure;
1693
1694
1695 rcu_read_lock();
1696 if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1697 goto nla_put_failure_rcu;
1698 rcu_read_unlock();
1699
1700 nlmsg_end(skb, nlh);
1701 return 0;
1702
1703 nla_put_failure_rcu:
1704 rcu_read_unlock();
1705 nla_put_failure:
1706 nlmsg_cancel(skb, nlh);
1707 return -EMSGSIZE;
1708 }
1709
1710 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1711 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1712 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1713 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1714 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1715 [IFLA_MTU] = { .type = NLA_U32 },
1716 [IFLA_LINK] = { .type = NLA_U32 },
1717 [IFLA_MASTER] = { .type = NLA_U32 },
1718 [IFLA_CARRIER] = { .type = NLA_U8 },
1719 [IFLA_TXQLEN] = { .type = NLA_U32 },
1720 [IFLA_WEIGHT] = { .type = NLA_U32 },
1721 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1722 [IFLA_LINKMODE] = { .type = NLA_U8 },
1723 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1724 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1725 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1726 /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1727 * allow 0-length string (needed to remove an alias).
1728 */
1729 [IFLA_IFALIAS] = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1730 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1731 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1732 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1733 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1734 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1735 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1736 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1737 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1738 [IFLA_GSO_MAX_SEGS] = { .type = NLA_U32 },
1739 [IFLA_GSO_MAX_SIZE] = { .type = NLA_U32 },
1740 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1741 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1742 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1743 [IFLA_LINK_NETNSID] = { .type = NLA_S32 },
1744 [IFLA_PROTO_DOWN] = { .type = NLA_U8 },
1745 [IFLA_XDP] = { .type = NLA_NESTED },
1746 [IFLA_EVENT] = { .type = NLA_U32 },
1747 [IFLA_GROUP] = { .type = NLA_U32 },
1748 [IFLA_TARGET_NETNSID] = { .type = NLA_S32 },
1749 [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1750 [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1751 [IFLA_MIN_MTU] = { .type = NLA_U32 },
1752 [IFLA_MAX_MTU] = { .type = NLA_U32 },
1753 };
1754
1755 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1756 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1757 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1758 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1759 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1760 };
1761
1762 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1763 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
1764 [IFLA_VF_BROADCAST] = { .type = NLA_REJECT },
1765 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
1766 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED },
1767 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
1768 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
1769 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) },
1770 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) },
1771 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) },
1772 [IFLA_VF_STATS] = { .type = NLA_NESTED },
1773 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) },
1774 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) },
1775 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) },
1776 };
1777
1778 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1779 [IFLA_PORT_VF] = { .type = NLA_U32 },
1780 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1781 .len = PORT_PROFILE_MAX },
1782 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1783 .len = PORT_UUID_MAX },
1784 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1785 .len = PORT_UUID_MAX },
1786 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1787 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1788
1789 /* Unused, but we need to keep it here since user space could
1790 * fill it. It's also broken with regard to NLA_BINARY use in
1791 * combination with structs.
1792 */
1793 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1794 .len = sizeof(struct ifla_port_vsi) },
1795 };
1796
1797 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1798 [IFLA_XDP_FD] = { .type = NLA_S32 },
1799 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 },
1800 [IFLA_XDP_FLAGS] = { .type = NLA_U32 },
1801 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 },
1802 };
1803
1804 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1805 {
1806 const struct rtnl_link_ops *ops = NULL;
1807 struct nlattr *linfo[IFLA_INFO_MAX + 1];
1808
1809 if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
1810 return NULL;
1811
1812 if (linfo[IFLA_INFO_KIND]) {
1813 char kind[MODULE_NAME_LEN];
1814
1815 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1816 ops = rtnl_link_ops_get(kind);
1817 }
1818
1819 return ops;
1820 }
1821
1822 static bool link_master_filtered(struct net_device *dev, int master_idx)
1823 {
1824 struct net_device *master;
1825
1826 if (!master_idx)
1827 return false;
1828
1829 master = netdev_master_upper_dev_get(dev);
1830 if (!master || master->ifindex != master_idx)
1831 return true;
1832
1833 return false;
1834 }
1835
1836 static bool link_kind_filtered(const struct net_device *dev,
1837 const struct rtnl_link_ops *kind_ops)
1838 {
1839 if (kind_ops && dev->rtnl_link_ops != kind_ops)
1840 return true;
1841
1842 return false;
1843 }
1844
1845 static bool link_dump_filtered(struct net_device *dev,
1846 int master_idx,
1847 const struct rtnl_link_ops *kind_ops)
1848 {
1849 if (link_master_filtered(dev, master_idx) ||
1850 link_kind_filtered(dev, kind_ops))
1851 return true;
1852
1853 return false;
1854 }
1855
1856 /**
1857 * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
1858 * @sk: netlink socket
1859 * @netnsid: network namespace identifier
1860 *
1861 * Returns the network namespace identified by netnsid on success or an error
1862 * pointer on failure.
1863 */
1864 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
1865 {
1866 struct net *net;
1867
1868 net = get_net_ns_by_id(sock_net(sk), netnsid);
1869 if (!net)
1870 return ERR_PTR(-EINVAL);
1871
1872 /* For now, the caller is required to have CAP_NET_ADMIN in
1873 * the user namespace owning the target net ns.
1874 */
1875 if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
1876 put_net(net);
1877 return ERR_PTR(-EACCES);
1878 }
1879 return net;
1880 }
1881 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
1882
1883 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
1884 bool strict_check, struct nlattr **tb,
1885 struct netlink_ext_ack *extack)
1886 {
1887 int hdrlen;
1888
1889 if (strict_check) {
1890 struct ifinfomsg *ifm;
1891
1892 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1893 NL_SET_ERR_MSG(extack, "Invalid header for link dump");
1894 return -EINVAL;
1895 }
1896
1897 ifm = nlmsg_data(nlh);
1898 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
1899 ifm->ifi_change) {
1900 NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
1901 return -EINVAL;
1902 }
1903 if (ifm->ifi_index) {
1904 NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
1905 return -EINVAL;
1906 }
1907
1908 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
1909 IFLA_MAX, ifla_policy,
1910 extack);
1911 }
1912
1913 /* A hack to preserve kernel<->userspace interface.
1914 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1915 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1916 * what iproute2 < v3.9.0 used.
1917 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1918 * attribute, its netlink message is shorter than struct ifinfomsg.
1919 */
1920 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
1921 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1922
1923 return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
1924 extack);
1925 }
1926
1927 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1928 {
1929 struct netlink_ext_ack *extack = cb->extack;
1930 const struct nlmsghdr *nlh = cb->nlh;
1931 struct net *net = sock_net(skb->sk);
1932 struct net *tgt_net = net;
1933 int h, s_h;
1934 int idx = 0, s_idx;
1935 struct net_device *dev;
1936 struct hlist_head *head;
1937 struct nlattr *tb[IFLA_MAX+1];
1938 u32 ext_filter_mask = 0;
1939 const struct rtnl_link_ops *kind_ops = NULL;
1940 unsigned int flags = NLM_F_MULTI;
1941 int master_idx = 0;
1942 int netnsid = -1;
1943 int err, i;
1944
1945 s_h = cb->args[0];
1946 s_idx = cb->args[1];
1947
1948 err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
1949 if (err < 0) {
1950 if (cb->strict_check)
1951 return err;
1952
1953 goto walk_entries;
1954 }
1955
1956 for (i = 0; i <= IFLA_MAX; ++i) {
1957 if (!tb[i])
1958 continue;
1959
1960 /* new attributes should only be added with strict checking */
1961 switch (i) {
1962 case IFLA_TARGET_NETNSID:
1963 netnsid = nla_get_s32(tb[i]);
1964 tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
1965 if (IS_ERR(tgt_net)) {
1966 NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
1967 return PTR_ERR(tgt_net);
1968 }
1969 break;
1970 case IFLA_EXT_MASK:
1971 ext_filter_mask = nla_get_u32(tb[i]);
1972 break;
1973 case IFLA_MASTER:
1974 master_idx = nla_get_u32(tb[i]);
1975 break;
1976 case IFLA_LINKINFO:
1977 kind_ops = linkinfo_to_kind_ops(tb[i]);
1978 break;
1979 default:
1980 if (cb->strict_check) {
1981 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
1982 return -EINVAL;
1983 }
1984 }
1985 }
1986
1987 if (master_idx || kind_ops)
1988 flags |= NLM_F_DUMP_FILTERED;
1989
1990 walk_entries:
1991 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1992 idx = 0;
1993 head = &tgt_net->dev_index_head[h];
1994 hlist_for_each_entry(dev, head, index_hlist) {
1995 if (link_dump_filtered(dev, master_idx, kind_ops))
1996 goto cont;
1997 if (idx < s_idx)
1998 goto cont;
1999 err = rtnl_fill_ifinfo(skb, dev, net,
2000 RTM_NEWLINK,
2001 NETLINK_CB(cb->skb).portid,
2002 nlh->nlmsg_seq, 0, flags,
2003 ext_filter_mask, 0, NULL, 0,
2004 netnsid, GFP_KERNEL);
2005
2006 if (err < 0) {
2007 if (likely(skb->len))
2008 goto out;
2009
2010 goto out_err;
2011 }
2012 cont:
2013 idx++;
2014 }
2015 }
2016 out:
2017 err = skb->len;
2018 out_err:
2019 cb->args[1] = idx;
2020 cb->args[0] = h;
2021 cb->seq = net->dev_base_seq;
2022 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2023 if (netnsid >= 0)
2024 put_net(tgt_net);
2025
2026 return err;
2027 }
2028
2029 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2030 struct netlink_ext_ack *exterr)
2031 {
2032 return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
2033 exterr);
2034 }
2035 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
2036
2037 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2038 {
2039 struct net *net;
2040 /* Examine the link attributes and figure out which
2041 * network namespace we are talking about.
2042 */
2043 if (tb[IFLA_NET_NS_PID])
2044 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2045 else if (tb[IFLA_NET_NS_FD])
2046 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2047 else
2048 net = get_net(src_net);
2049 return net;
2050 }
2051 EXPORT_SYMBOL(rtnl_link_get_net);
2052
2053 /* Figure out which network namespace we are talking about by
2054 * examining the link attributes in the following order:
2055 *
2056 * 1. IFLA_NET_NS_PID
2057 * 2. IFLA_NET_NS_FD
2058 * 3. IFLA_TARGET_NETNSID
2059 */
2060 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2061 struct nlattr *tb[])
2062 {
2063 struct net *net;
2064
2065 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2066 return rtnl_link_get_net(src_net, tb);
2067
2068 if (!tb[IFLA_TARGET_NETNSID])
2069 return get_net(src_net);
2070
2071 net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2072 if (!net)
2073 return ERR_PTR(-EINVAL);
2074
2075 return net;
2076 }
2077
2078 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2079 struct net *src_net,
2080 struct nlattr *tb[], int cap)
2081 {
2082 struct net *net;
2083
2084 net = rtnl_link_get_net_by_nlattr(src_net, tb);
2085 if (IS_ERR(net))
2086 return net;
2087
2088 if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2089 put_net(net);
2090 return ERR_PTR(-EPERM);
2091 }
2092
2093 return net;
2094 }
2095
2096 /* Verify that rtnetlink requests do not pass additional properties
2097 * potentially referring to different network namespaces.
2098 */
2099 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2100 struct netlink_ext_ack *extack,
2101 bool netns_id_only)
2102 {
2103
2104 if (netns_id_only) {
2105 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2106 return 0;
2107
2108 NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2109 return -EOPNOTSUPP;
2110 }
2111
2112 if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2113 goto invalid_attr;
2114
2115 if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2116 goto invalid_attr;
2117
2118 if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2119 goto invalid_attr;
2120
2121 return 0;
2122
2123 invalid_attr:
2124 NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2125 return -EINVAL;
2126 }
2127
2128 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
2129 {
2130 if (dev) {
2131 if (tb[IFLA_ADDRESS] &&
2132 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2133 return -EINVAL;
2134
2135 if (tb[IFLA_BROADCAST] &&
2136 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2137 return -EINVAL;
2138 }
2139
2140 if (tb[IFLA_AF_SPEC]) {
2141 struct nlattr *af;
2142 int rem, err;
2143
2144 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2145 const struct rtnl_af_ops *af_ops;
2146
2147 rcu_read_lock();
2148 af_ops = rtnl_af_lookup(nla_type(af));
2149 if (!af_ops) {
2150 rcu_read_unlock();
2151 return -EAFNOSUPPORT;
2152 }
2153
2154 if (!af_ops->set_link_af) {
2155 rcu_read_unlock();
2156 return -EOPNOTSUPP;
2157 }
2158
2159 if (af_ops->validate_link_af) {
2160 err = af_ops->validate_link_af(dev, af);
2161 if (err < 0) {
2162 rcu_read_unlock();
2163 return err;
2164 }
2165 }
2166
2167 rcu_read_unlock();
2168 }
2169 }
2170
2171 return 0;
2172 }
2173
2174 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2175 int guid_type)
2176 {
2177 const struct net_device_ops *ops = dev->netdev_ops;
2178
2179 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2180 }
2181
2182 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2183 {
2184 if (dev->type != ARPHRD_INFINIBAND)
2185 return -EOPNOTSUPP;
2186
2187 return handle_infiniband_guid(dev, ivt, guid_type);
2188 }
2189
2190 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2191 {
2192 const struct net_device_ops *ops = dev->netdev_ops;
2193 int err = -EINVAL;
2194
2195 if (tb[IFLA_VF_MAC]) {
2196 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2197
2198 err = -EOPNOTSUPP;
2199 if (ops->ndo_set_vf_mac)
2200 err = ops->ndo_set_vf_mac(dev, ivm->vf,
2201 ivm->mac);
2202 if (err < 0)
2203 return err;
2204 }
2205
2206 if (tb[IFLA_VF_VLAN]) {
2207 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2208
2209 err = -EOPNOTSUPP;
2210 if (ops->ndo_set_vf_vlan)
2211 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2212 ivv->qos,
2213 htons(ETH_P_8021Q));
2214 if (err < 0)
2215 return err;
2216 }
2217
2218 if (tb[IFLA_VF_VLAN_LIST]) {
2219 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2220 struct nlattr *attr;
2221 int rem, len = 0;
2222
2223 err = -EOPNOTSUPP;
2224 if (!ops->ndo_set_vf_vlan)
2225 return err;
2226
2227 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2228 if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2229 nla_len(attr) < NLA_HDRLEN) {
2230 return -EINVAL;
2231 }
2232 if (len >= MAX_VLAN_LIST_LEN)
2233 return -EOPNOTSUPP;
2234 ivvl[len] = nla_data(attr);
2235
2236 len++;
2237 }
2238 if (len == 0)
2239 return -EINVAL;
2240
2241 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2242 ivvl[0]->qos, ivvl[0]->vlan_proto);
2243 if (err < 0)
2244 return err;
2245 }
2246
2247 if (tb[IFLA_VF_TX_RATE]) {
2248 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2249 struct ifla_vf_info ivf;
2250
2251 err = -EOPNOTSUPP;
2252 if (ops->ndo_get_vf_config)
2253 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2254 if (err < 0)
2255 return err;
2256
2257 err = -EOPNOTSUPP;
2258 if (ops->ndo_set_vf_rate)
2259 err = ops->ndo_set_vf_rate(dev, ivt->vf,
2260 ivf.min_tx_rate,
2261 ivt->rate);
2262 if (err < 0)
2263 return err;
2264 }
2265
2266 if (tb[IFLA_VF_RATE]) {
2267 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2268
2269 err = -EOPNOTSUPP;
2270 if (ops->ndo_set_vf_rate)
2271 err = ops->ndo_set_vf_rate(dev, ivt->vf,
2272 ivt->min_tx_rate,
2273 ivt->max_tx_rate);
2274 if (err < 0)
2275 return err;
2276 }
2277
2278 if (tb[IFLA_VF_SPOOFCHK]) {
2279 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2280
2281 err = -EOPNOTSUPP;
2282 if (ops->ndo_set_vf_spoofchk)
2283 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2284 ivs->setting);
2285 if (err < 0)
2286 return err;
2287 }
2288
2289 if (tb[IFLA_VF_LINK_STATE]) {
2290 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2291
2292 err = -EOPNOTSUPP;
2293 if (ops->ndo_set_vf_link_state)
2294 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2295 ivl->link_state);
2296 if (err < 0)
2297 return err;
2298 }
2299
2300 if (tb[IFLA_VF_RSS_QUERY_EN]) {
2301 struct ifla_vf_rss_query_en *ivrssq_en;
2302
2303 err = -EOPNOTSUPP;
2304 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2305 if (ops->ndo_set_vf_rss_query_en)
2306 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2307 ivrssq_en->setting);
2308 if (err < 0)
2309 return err;
2310 }
2311
2312 if (tb[IFLA_VF_TRUST]) {
2313 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2314
2315 err = -EOPNOTSUPP;
2316 if (ops->ndo_set_vf_trust)
2317 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2318 if (err < 0)
2319 return err;
2320 }
2321
2322 if (tb[IFLA_VF_IB_NODE_GUID]) {
2323 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2324
2325 if (!ops->ndo_set_vf_guid)
2326 return -EOPNOTSUPP;
2327
2328 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2329 }
2330
2331 if (tb[IFLA_VF_IB_PORT_GUID]) {
2332 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2333
2334 if (!ops->ndo_set_vf_guid)
2335 return -EOPNOTSUPP;
2336
2337 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2338 }
2339
2340 return err;
2341 }
2342
2343 static int do_set_master(struct net_device *dev, int ifindex,
2344 struct netlink_ext_ack *extack)
2345 {
2346 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2347 const struct net_device_ops *ops;
2348 int err;
2349
2350 if (upper_dev) {
2351 if (upper_dev->ifindex == ifindex)
2352 return 0;
2353 ops = upper_dev->netdev_ops;
2354 if (ops->ndo_del_slave) {
2355 err = ops->ndo_del_slave(upper_dev, dev);
2356 if (err)
2357 return err;
2358 } else {
2359 return -EOPNOTSUPP;
2360 }
2361 }
2362
2363 if (ifindex) {
2364 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2365 if (!upper_dev)
2366 return -EINVAL;
2367 ops = upper_dev->netdev_ops;
2368 if (ops->ndo_add_slave) {
2369 err = ops->ndo_add_slave(upper_dev, dev, extack);
2370 if (err)
2371 return err;
2372 } else {
2373 return -EOPNOTSUPP;
2374 }
2375 }
2376 return 0;
2377 }
2378
2379 #define DO_SETLINK_MODIFIED 0x01
2380 /* notify flag means notify + modified. */
2381 #define DO_SETLINK_NOTIFY 0x03
2382 static int do_setlink(const struct sk_buff *skb,
2383 struct net_device *dev, struct ifinfomsg *ifm,
2384 struct netlink_ext_ack *extack,
2385 struct nlattr **tb, char *ifname, int status)
2386 {
2387 const struct net_device_ops *ops = dev->netdev_ops;
2388 int err;
2389
2390 err = validate_linkmsg(dev, tb);
2391 if (err < 0)
2392 return err;
2393
2394 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2395 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev),
2396 tb, CAP_NET_ADMIN);
2397 if (IS_ERR(net)) {
2398 err = PTR_ERR(net);
2399 goto errout;
2400 }
2401
2402 err = dev_change_net_namespace(dev, net, ifname);
2403 put_net(net);
2404 if (err)
2405 goto errout;
2406 status |= DO_SETLINK_MODIFIED;
2407 }
2408
2409 if (tb[IFLA_MAP]) {
2410 struct rtnl_link_ifmap *u_map;
2411 struct ifmap k_map;
2412
2413 if (!ops->ndo_set_config) {
2414 err = -EOPNOTSUPP;
2415 goto errout;
2416 }
2417
2418 if (!netif_device_present(dev)) {
2419 err = -ENODEV;
2420 goto errout;
2421 }
2422
2423 u_map = nla_data(tb[IFLA_MAP]);
2424 k_map.mem_start = (unsigned long) u_map->mem_start;
2425 k_map.mem_end = (unsigned long) u_map->mem_end;
2426 k_map.base_addr = (unsigned short) u_map->base_addr;
2427 k_map.irq = (unsigned char) u_map->irq;
2428 k_map.dma = (unsigned char) u_map->dma;
2429 k_map.port = (unsigned char) u_map->port;
2430
2431 err = ops->ndo_set_config(dev, &k_map);
2432 if (err < 0)
2433 goto errout;
2434
2435 status |= DO_SETLINK_NOTIFY;
2436 }
2437
2438 if (tb[IFLA_ADDRESS]) {
2439 struct sockaddr *sa;
2440 int len;
2441
2442 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2443 sizeof(*sa));
2444 sa = kmalloc(len, GFP_KERNEL);
2445 if (!sa) {
2446 err = -ENOMEM;
2447 goto errout;
2448 }
2449 sa->sa_family = dev->type;
2450 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2451 dev->addr_len);
2452 err = dev_set_mac_address(dev, sa, extack);
2453 kfree(sa);
2454 if (err)
2455 goto errout;
2456 status |= DO_SETLINK_MODIFIED;
2457 }
2458
2459 if (tb[IFLA_MTU]) {
2460 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2461 if (err < 0)
2462 goto errout;
2463 status |= DO_SETLINK_MODIFIED;
2464 }
2465
2466 if (tb[IFLA_GROUP]) {
2467 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2468 status |= DO_SETLINK_NOTIFY;
2469 }
2470
2471 /*
2472 * Interface selected by interface index but interface
2473 * name provided implies that a name change has been
2474 * requested.
2475 */
2476 if (ifm->ifi_index > 0 && ifname[0]) {
2477 err = dev_change_name(dev, ifname);
2478 if (err < 0)
2479 goto errout;
2480 status |= DO_SETLINK_MODIFIED;
2481 }
2482
2483 if (tb[IFLA_IFALIAS]) {
2484 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2485 nla_len(tb[IFLA_IFALIAS]));
2486 if (err < 0)
2487 goto errout;
2488 status |= DO_SETLINK_NOTIFY;
2489 }
2490
2491 if (tb[IFLA_BROADCAST]) {
2492 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2493 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2494 }
2495
2496 if (ifm->ifi_flags || ifm->ifi_change) {
2497 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2498 extack);
2499 if (err < 0)
2500 goto errout;
2501 }
2502
2503 if (tb[IFLA_MASTER]) {
2504 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2505 if (err)
2506 goto errout;
2507 status |= DO_SETLINK_MODIFIED;
2508 }
2509
2510 if (tb[IFLA_CARRIER]) {
2511 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2512 if (err)
2513 goto errout;
2514 status |= DO_SETLINK_MODIFIED;
2515 }
2516
2517 if (tb[IFLA_TXQLEN]) {
2518 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2519
2520 err = dev_change_tx_queue_len(dev, value);
2521 if (err)
2522 goto errout;
2523 status |= DO_SETLINK_MODIFIED;
2524 }
2525
2526 if (tb[IFLA_GSO_MAX_SIZE]) {
2527 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2528
2529 if (max_size > GSO_MAX_SIZE) {
2530 err = -EINVAL;
2531 goto errout;
2532 }
2533
2534 if (dev->gso_max_size ^ max_size) {
2535 netif_set_gso_max_size(dev, max_size);
2536 status |= DO_SETLINK_MODIFIED;
2537 }
2538 }
2539
2540 if (tb[IFLA_GSO_MAX_SEGS]) {
2541 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2542
2543 if (max_segs > GSO_MAX_SEGS) {
2544 err = -EINVAL;
2545 goto errout;
2546 }
2547
2548 if (dev->gso_max_segs ^ max_segs) {
2549 dev->gso_max_segs = max_segs;
2550 status |= DO_SETLINK_MODIFIED;
2551 }
2552 }
2553
2554 if (tb[IFLA_OPERSTATE])
2555 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2556
2557 if (tb[IFLA_LINKMODE]) {
2558 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2559
2560 write_lock_bh(&dev_base_lock);
2561 if (dev->link_mode ^ value)
2562 status |= DO_SETLINK_NOTIFY;
2563 dev->link_mode = value;
2564 write_unlock_bh(&dev_base_lock);
2565 }
2566
2567 if (tb[IFLA_VFINFO_LIST]) {
2568 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2569 struct nlattr *attr;
2570 int rem;
2571
2572 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2573 if (nla_type(attr) != IFLA_VF_INFO ||
2574 nla_len(attr) < NLA_HDRLEN) {
2575 err = -EINVAL;
2576 goto errout;
2577 }
2578 err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
2579 attr,
2580 ifla_vf_policy,
2581 NULL);
2582 if (err < 0)
2583 goto errout;
2584 err = do_setvfinfo(dev, vfinfo);
2585 if (err < 0)
2586 goto errout;
2587 status |= DO_SETLINK_NOTIFY;
2588 }
2589 }
2590 err = 0;
2591
2592 if (tb[IFLA_VF_PORTS]) {
2593 struct nlattr *port[IFLA_PORT_MAX+1];
2594 struct nlattr *attr;
2595 int vf;
2596 int rem;
2597
2598 err = -EOPNOTSUPP;
2599 if (!ops->ndo_set_vf_port)
2600 goto errout;
2601
2602 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2603 if (nla_type(attr) != IFLA_VF_PORT ||
2604 nla_len(attr) < NLA_HDRLEN) {
2605 err = -EINVAL;
2606 goto errout;
2607 }
2608 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2609 attr,
2610 ifla_port_policy,
2611 NULL);
2612 if (err < 0)
2613 goto errout;
2614 if (!port[IFLA_PORT_VF]) {
2615 err = -EOPNOTSUPP;
2616 goto errout;
2617 }
2618 vf = nla_get_u32(port[IFLA_PORT_VF]);
2619 err = ops->ndo_set_vf_port(dev, vf, port);
2620 if (err < 0)
2621 goto errout;
2622 status |= DO_SETLINK_NOTIFY;
2623 }
2624 }
2625 err = 0;
2626
2627 if (tb[IFLA_PORT_SELF]) {
2628 struct nlattr *port[IFLA_PORT_MAX+1];
2629
2630 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2631 tb[IFLA_PORT_SELF],
2632 ifla_port_policy, NULL);
2633 if (err < 0)
2634 goto errout;
2635
2636 err = -EOPNOTSUPP;
2637 if (ops->ndo_set_vf_port)
2638 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2639 if (err < 0)
2640 goto errout;
2641 status |= DO_SETLINK_NOTIFY;
2642 }
2643
2644 if (tb[IFLA_AF_SPEC]) {
2645 struct nlattr *af;
2646 int rem;
2647
2648 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2649 const struct rtnl_af_ops *af_ops;
2650
2651 rcu_read_lock();
2652
2653 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2654
2655 err = af_ops->set_link_af(dev, af);
2656 if (err < 0) {
2657 rcu_read_unlock();
2658 goto errout;
2659 }
2660
2661 rcu_read_unlock();
2662 status |= DO_SETLINK_NOTIFY;
2663 }
2664 }
2665 err = 0;
2666
2667 if (tb[IFLA_PROTO_DOWN]) {
2668 err = dev_change_proto_down(dev,
2669 nla_get_u8(tb[IFLA_PROTO_DOWN]));
2670 if (err)
2671 goto errout;
2672 status |= DO_SETLINK_NOTIFY;
2673 }
2674
2675 if (tb[IFLA_XDP]) {
2676 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2677 u32 xdp_flags = 0;
2678
2679 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
2680 tb[IFLA_XDP],
2681 ifla_xdp_policy, NULL);
2682 if (err < 0)
2683 goto errout;
2684
2685 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2686 err = -EINVAL;
2687 goto errout;
2688 }
2689
2690 if (xdp[IFLA_XDP_FLAGS]) {
2691 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2692 if (xdp_flags & ~XDP_FLAGS_MASK) {
2693 err = -EINVAL;
2694 goto errout;
2695 }
2696 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2697 err = -EINVAL;
2698 goto errout;
2699 }
2700 }
2701
2702 if (xdp[IFLA_XDP_FD]) {
2703 err = dev_change_xdp_fd(dev, extack,
2704 nla_get_s32(xdp[IFLA_XDP_FD]),
2705 xdp_flags);
2706 if (err)
2707 goto errout;
2708 status |= DO_SETLINK_NOTIFY;
2709 }
2710 }
2711
2712 errout:
2713 if (status & DO_SETLINK_MODIFIED) {
2714 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2715 netdev_state_change(dev);
2716
2717 if (err < 0)
2718 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",
2719 dev->name);
2720 }
2721
2722 return err;
2723 }
2724
2725 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2726 struct netlink_ext_ack *extack)
2727 {
2728 struct net *net = sock_net(skb->sk);
2729 struct ifinfomsg *ifm;
2730 struct net_device *dev;
2731 int err;
2732 struct nlattr *tb[IFLA_MAX+1];
2733 char ifname[IFNAMSIZ];
2734
2735 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2736 ifla_policy, extack);
2737 if (err < 0)
2738 goto errout;
2739
2740 err = rtnl_ensure_unique_netns(tb, extack, false);
2741 if (err < 0)
2742 goto errout;
2743
2744 if (tb[IFLA_IFNAME])
2745 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2746 else
2747 ifname[0] = '\0';
2748
2749 err = -EINVAL;
2750 ifm = nlmsg_data(nlh);
2751 if (ifm->ifi_index > 0)
2752 dev = __dev_get_by_index(net, ifm->ifi_index);
2753 else if (tb[IFLA_IFNAME])
2754 dev = __dev_get_by_name(net, ifname);
2755 else
2756 goto errout;
2757
2758 if (dev == NULL) {
2759 err = -ENODEV;
2760 goto errout;
2761 }
2762
2763 err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2764 errout:
2765 return err;
2766 }
2767
2768 static int rtnl_group_dellink(const struct net *net, int group)
2769 {
2770 struct net_device *dev, *aux;
2771 LIST_HEAD(list_kill);
2772 bool found = false;
2773
2774 if (!group)
2775 return -EPERM;
2776
2777 for_each_netdev(net, dev) {
2778 if (dev->group == group) {
2779 const struct rtnl_link_ops *ops;
2780
2781 found = true;
2782 ops = dev->rtnl_link_ops;
2783 if (!ops || !ops->dellink)
2784 return -EOPNOTSUPP;
2785 }
2786 }
2787
2788 if (!found)
2789 return -ENODEV;
2790
2791 for_each_netdev_safe(net, dev, aux) {
2792 if (dev->group == group) {
2793 const struct rtnl_link_ops *ops;
2794
2795 ops = dev->rtnl_link_ops;
2796 ops->dellink(dev, &list_kill);
2797 }
2798 }
2799 unregister_netdevice_many(&list_kill);
2800
2801 return 0;
2802 }
2803
2804 int rtnl_delete_link(struct net_device *dev)
2805 {
2806 const struct rtnl_link_ops *ops;
2807 LIST_HEAD(list_kill);
2808
2809 ops = dev->rtnl_link_ops;
2810 if (!ops || !ops->dellink)
2811 return -EOPNOTSUPP;
2812
2813 ops->dellink(dev, &list_kill);
2814 unregister_netdevice_many(&list_kill);
2815
2816 return 0;
2817 }
2818 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2819
2820 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2821 struct netlink_ext_ack *extack)
2822 {
2823 struct net *net = sock_net(skb->sk);
2824 struct net *tgt_net = net;
2825 struct net_device *dev = NULL;
2826 struct ifinfomsg *ifm;
2827 char ifname[IFNAMSIZ];
2828 struct nlattr *tb[IFLA_MAX+1];
2829 int err;
2830 int netnsid = -1;
2831
2832 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2833 ifla_policy, extack);
2834 if (err < 0)
2835 return err;
2836
2837 err = rtnl_ensure_unique_netns(tb, extack, true);
2838 if (err < 0)
2839 return err;
2840
2841 if (tb[IFLA_IFNAME])
2842 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2843
2844 if (tb[IFLA_TARGET_NETNSID]) {
2845 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
2846 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
2847 if (IS_ERR(tgt_net))
2848 return PTR_ERR(tgt_net);
2849 }
2850
2851 err = -EINVAL;
2852 ifm = nlmsg_data(nlh);
2853 if (ifm->ifi_index > 0)
2854 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
2855 else if (tb[IFLA_IFNAME])
2856 dev = __dev_get_by_name(tgt_net, ifname);
2857 else if (tb[IFLA_GROUP])
2858 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
2859 else
2860 goto out;
2861
2862 if (!dev) {
2863 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
2864 err = -ENODEV;
2865
2866 goto out;
2867 }
2868
2869 err = rtnl_delete_link(dev);
2870
2871 out:
2872 if (netnsid >= 0)
2873 put_net(tgt_net);
2874
2875 return err;
2876 }
2877
2878 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2879 {
2880 unsigned int old_flags;
2881 int err;
2882
2883 old_flags = dev->flags;
2884 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2885 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2886 NULL);
2887 if (err < 0)
2888 return err;
2889 }
2890
2891 if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
2892 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
2893 } else {
2894 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2895 __dev_notify_flags(dev, old_flags, ~0U);
2896 }
2897 return 0;
2898 }
2899 EXPORT_SYMBOL(rtnl_configure_link);
2900
2901 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
2902 unsigned char name_assign_type,
2903 const struct rtnl_link_ops *ops,
2904 struct nlattr *tb[],
2905 struct netlink_ext_ack *extack)
2906 {
2907 struct net_device *dev;
2908 unsigned int num_tx_queues = 1;
2909 unsigned int num_rx_queues = 1;
2910
2911 if (tb[IFLA_NUM_TX_QUEUES])
2912 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2913 else if (ops->get_num_tx_queues)
2914 num_tx_queues = ops->get_num_tx_queues();
2915
2916 if (tb[IFLA_NUM_RX_QUEUES])
2917 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2918 else if (ops->get_num_rx_queues)
2919 num_rx_queues = ops->get_num_rx_queues();
2920
2921 if (num_tx_queues < 1 || num_tx_queues > 4096) {
2922 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
2923 return ERR_PTR(-EINVAL);
2924 }
2925
2926 if (num_rx_queues < 1 || num_rx_queues > 4096) {
2927 NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
2928 return ERR_PTR(-EINVAL);
2929 }
2930
2931 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2932 ops->setup, num_tx_queues, num_rx_queues);
2933 if (!dev)
2934 return ERR_PTR(-ENOMEM);
2935
2936 dev_net_set(dev, net);
2937 dev->rtnl_link_ops = ops;
2938 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2939
2940 if (tb[IFLA_MTU])
2941 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2942 if (tb[IFLA_ADDRESS]) {
2943 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2944 nla_len(tb[IFLA_ADDRESS]));
2945 dev->addr_assign_type = NET_ADDR_SET;
2946 }
2947 if (tb[IFLA_BROADCAST])
2948 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2949 nla_len(tb[IFLA_BROADCAST]));
2950 if (tb[IFLA_TXQLEN])
2951 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2952 if (tb[IFLA_OPERSTATE])
2953 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2954 if (tb[IFLA_LINKMODE])
2955 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2956 if (tb[IFLA_GROUP])
2957 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2958 if (tb[IFLA_GSO_MAX_SIZE])
2959 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
2960 if (tb[IFLA_GSO_MAX_SEGS])
2961 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2962
2963 return dev;
2964 }
2965 EXPORT_SYMBOL(rtnl_create_link);
2966
2967 static int rtnl_group_changelink(const struct sk_buff *skb,
2968 struct net *net, int group,
2969 struct ifinfomsg *ifm,
2970 struct netlink_ext_ack *extack,
2971 struct nlattr **tb)
2972 {
2973 struct net_device *dev, *aux;
2974 int err;
2975
2976 for_each_netdev_safe(net, dev, aux) {
2977 if (dev->group == group) {
2978 err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
2979 if (err < 0)
2980 return err;
2981 }
2982 }
2983
2984 return 0;
2985 }
2986
2987 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2988 struct nlattr **attr, struct netlink_ext_ack *extack)
2989 {
2990 struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
2991 unsigned char name_assign_type = NET_NAME_USER;
2992 struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
2993 const struct rtnl_link_ops *m_ops = NULL;
2994 struct net_device *master_dev = NULL;
2995 struct net *net = sock_net(skb->sk);
2996 const struct rtnl_link_ops *ops;
2997 struct nlattr *tb[IFLA_MAX + 1];
2998 struct net *dest_net, *link_net;
2999 struct nlattr **slave_data;
3000 char kind[MODULE_NAME_LEN];
3001 struct net_device *dev;
3002 struct ifinfomsg *ifm;
3003 char ifname[IFNAMSIZ];
3004 struct nlattr **data;
3005 int err;
3006
3007 #ifdef CONFIG_MODULES
3008 replay:
3009 #endif
3010 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3011 ifla_policy, extack);
3012 if (err < 0)
3013 return err;
3014
3015 err = rtnl_ensure_unique_netns(tb, extack, false);
3016 if (err < 0)
3017 return err;
3018
3019 if (tb[IFLA_IFNAME])
3020 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3021 else
3022 ifname[0] = '\0';
3023
3024 ifm = nlmsg_data(nlh);
3025 if (ifm->ifi_index > 0)
3026 dev = __dev_get_by_index(net, ifm->ifi_index);
3027 else {
3028 if (ifname[0])
3029 dev = __dev_get_by_name(net, ifname);
3030 else
3031 dev = NULL;
3032 }
3033
3034 if (dev) {
3035 master_dev = netdev_master_upper_dev_get(dev);
3036 if (master_dev)
3037 m_ops = master_dev->rtnl_link_ops;
3038 }
3039
3040 err = validate_linkmsg(dev, tb);
3041 if (err < 0)
3042 return err;
3043
3044 if (tb[IFLA_LINKINFO]) {
3045 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3046 tb[IFLA_LINKINFO],
3047 ifla_info_policy, NULL);
3048 if (err < 0)
3049 return err;
3050 } else
3051 memset(linkinfo, 0, sizeof(linkinfo));
3052
3053 if (linkinfo[IFLA_INFO_KIND]) {
3054 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3055 ops = rtnl_link_ops_get(kind);
3056 } else {
3057 kind[0] = '\0';
3058 ops = NULL;
3059 }
3060
3061 data = NULL;
3062 if (ops) {
3063 if (ops->maxtype > RTNL_MAX_TYPE)
3064 return -EINVAL;
3065
3066 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3067 err = nla_parse_nested_deprecated(attr, ops->maxtype,
3068 linkinfo[IFLA_INFO_DATA],
3069 ops->policy, extack);
3070 if (err < 0)
3071 return err;
3072 data = attr;
3073 }
3074 if (ops->validate) {
3075 err = ops->validate(tb, data, extack);
3076 if (err < 0)
3077 return err;
3078 }
3079 }
3080
3081 slave_data = NULL;
3082 if (m_ops) {
3083 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3084 return -EINVAL;
3085
3086 if (m_ops->slave_maxtype &&
3087 linkinfo[IFLA_INFO_SLAVE_DATA]) {
3088 err = nla_parse_nested_deprecated(slave_attr,
3089 m_ops->slave_maxtype,
3090 linkinfo[IFLA_INFO_SLAVE_DATA],
3091 m_ops->slave_policy,
3092 extack);
3093 if (err < 0)
3094 return err;
3095 slave_data = slave_attr;
3096 }
3097 }
3098
3099 if (dev) {
3100 int status = 0;
3101
3102 if (nlh->nlmsg_flags & NLM_F_EXCL)
3103 return -EEXIST;
3104 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3105 return -EOPNOTSUPP;
3106
3107 if (linkinfo[IFLA_INFO_DATA]) {
3108 if (!ops || ops != dev->rtnl_link_ops ||
3109 !ops->changelink)
3110 return -EOPNOTSUPP;
3111
3112 err = ops->changelink(dev, tb, data, extack);
3113 if (err < 0)
3114 return err;
3115 status |= DO_SETLINK_NOTIFY;
3116 }
3117
3118 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3119 if (!m_ops || !m_ops->slave_changelink)
3120 return -EOPNOTSUPP;
3121
3122 err = m_ops->slave_changelink(master_dev, dev, tb,
3123 slave_data, extack);
3124 if (err < 0)
3125 return err;
3126 status |= DO_SETLINK_NOTIFY;
3127 }
3128
3129 return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
3130 }
3131
3132 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3133 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3134 return rtnl_group_changelink(skb, net,
3135 nla_get_u32(tb[IFLA_GROUP]),
3136 ifm, extack, tb);
3137 return -ENODEV;
3138 }
3139
3140 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3141 return -EOPNOTSUPP;
3142
3143 if (!ops) {
3144 #ifdef CONFIG_MODULES
3145 if (kind[0]) {
3146 __rtnl_unlock();
3147 request_module("rtnl-link-%s", kind);
3148 rtnl_lock();
3149 ops = rtnl_link_ops_get(kind);
3150 if (ops)
3151 goto replay;
3152 }
3153 #endif
3154 NL_SET_ERR_MSG(extack, "Unknown device type");
3155 return -EOPNOTSUPP;
3156 }
3157
3158 if (!ops->setup)
3159 return -EOPNOTSUPP;
3160
3161 if (!ifname[0]) {
3162 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3163 name_assign_type = NET_NAME_ENUM;
3164 }
3165
3166 dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3167 if (IS_ERR(dest_net))
3168 return PTR_ERR(dest_net);
3169
3170 if (tb[IFLA_LINK_NETNSID]) {
3171 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3172
3173 link_net = get_net_ns_by_id(dest_net, id);
3174 if (!link_net) {
3175 NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3176 err = -EINVAL;
3177 goto out;
3178 }
3179 err = -EPERM;
3180 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3181 goto out;
3182 } else {
3183 link_net = NULL;
3184 }
3185
3186 dev = rtnl_create_link(link_net ? : dest_net, ifname,
3187 name_assign_type, ops, tb, extack);
3188 if (IS_ERR(dev)) {
3189 err = PTR_ERR(dev);
3190 goto out;
3191 }
3192
3193 dev->ifindex = ifm->ifi_index;
3194
3195 if (ops->newlink) {
3196 err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3197 /* Drivers should call free_netdev() in ->destructor
3198 * and unregister it on failure after registration
3199 * so that device could be finally freed in rtnl_unlock.
3200 */
3201 if (err < 0) {
3202 /* If device is not registered at all, free it now */
3203 if (dev->reg_state == NETREG_UNINITIALIZED)
3204 free_netdev(dev);
3205 goto out;
3206 }
3207 } else {
3208 err = register_netdevice(dev);
3209 if (err < 0) {
3210 free_netdev(dev);
3211 goto out;
3212 }
3213 }
3214 err = rtnl_configure_link(dev, ifm);
3215 if (err < 0)
3216 goto out_unregister;
3217 if (link_net) {
3218 err = dev_change_net_namespace(dev, dest_net, ifname);
3219 if (err < 0)
3220 goto out_unregister;
3221 }
3222 if (tb[IFLA_MASTER]) {
3223 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3224 if (err)
3225 goto out_unregister;
3226 }
3227 out:
3228 if (link_net)
3229 put_net(link_net);
3230 put_net(dest_net);
3231 return err;
3232 out_unregister:
3233 if (ops->newlink) {
3234 LIST_HEAD(list_kill);
3235
3236 ops->dellink(dev, &list_kill);
3237 unregister_netdevice_many(&list_kill);
3238 } else {
3239 unregister_netdevice(dev);
3240 }
3241 goto out;
3242 }
3243
3244 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3245 struct netlink_ext_ack *extack)
3246 {
3247 struct nlattr **attr;
3248 int ret;
3249
3250 attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
3251 if (!attr)
3252 return -ENOMEM;
3253
3254 ret = __rtnl_newlink(skb, nlh, attr, extack);
3255 kfree(attr);
3256 return ret;
3257 }
3258
3259 static int rtnl_valid_getlink_req(struct sk_buff *skb,
3260 const struct nlmsghdr *nlh,
3261 struct nlattr **tb,
3262 struct netlink_ext_ack *extack)
3263 {
3264 struct ifinfomsg *ifm;
3265 int i, err;
3266
3267 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3268 NL_SET_ERR_MSG(extack, "Invalid header for get link");
3269 return -EINVAL;
3270 }
3271
3272 if (!netlink_strict_get_check(skb))
3273 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3274 ifla_policy, extack);
3275
3276 ifm = nlmsg_data(nlh);
3277 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3278 ifm->ifi_change) {
3279 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3280 return -EINVAL;
3281 }
3282
3283 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3284 ifla_policy, extack);
3285 if (err)
3286 return err;
3287
3288 for (i = 0; i <= IFLA_MAX; i++) {
3289 if (!tb[i])
3290 continue;
3291
3292 switch (i) {
3293 case IFLA_IFNAME:
3294 case IFLA_EXT_MASK:
3295 case IFLA_TARGET_NETNSID:
3296 break;
3297 default:
3298 NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3299 return -EINVAL;
3300 }
3301 }
3302
3303 return 0;
3304 }
3305
3306 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3307 struct netlink_ext_ack *extack)
3308 {
3309 struct net *net = sock_net(skb->sk);
3310 struct net *tgt_net = net;
3311 struct ifinfomsg *ifm;
3312 char ifname[IFNAMSIZ];
3313 struct nlattr *tb[IFLA_MAX+1];
3314 struct net_device *dev = NULL;
3315 struct sk_buff *nskb;
3316 int netnsid = -1;
3317 int err;
3318 u32 ext_filter_mask = 0;
3319
3320 err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3321 if (err < 0)
3322 return err;
3323
3324 err = rtnl_ensure_unique_netns(tb, extack, true);
3325 if (err < 0)
3326 return err;
3327
3328 if (tb[IFLA_TARGET_NETNSID]) {
3329 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3330 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3331 if (IS_ERR(tgt_net))
3332 return PTR_ERR(tgt_net);
3333 }
3334
3335 if (tb[IFLA_IFNAME])
3336 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3337
3338 if (tb[IFLA_EXT_MASK])
3339 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3340
3341 err = -EINVAL;
3342 ifm = nlmsg_data(nlh);
3343 if (ifm->ifi_index > 0)
3344 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3345 else if (tb[IFLA_IFNAME])
3346 dev = __dev_get_by_name(tgt_net, ifname);
3347 else
3348 goto out;
3349
3350 err = -ENODEV;
3351 if (dev == NULL)
3352 goto out;
3353
3354 err = -ENOBUFS;
3355 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3356 if (nskb == NULL)
3357 goto out;
3358
3359 err = rtnl_fill_ifinfo(nskb, dev, net,
3360 RTM_NEWLINK, NETLINK_CB(skb).portid,
3361 nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3362 0, NULL, 0, netnsid, GFP_KERNEL);
3363 if (err < 0) {
3364 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3365 WARN_ON(err == -EMSGSIZE);
3366 kfree_skb(nskb);
3367 } else
3368 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3369 out:
3370 if (netnsid >= 0)
3371 put_net(tgt_net);
3372
3373 return err;
3374 }
3375
3376 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3377 {
3378 struct net *net = sock_net(skb->sk);
3379 struct net_device *dev;
3380 struct nlattr *tb[IFLA_MAX+1];
3381 u32 ext_filter_mask = 0;
3382 u16 min_ifinfo_dump_size = 0;
3383 int hdrlen;
3384
3385 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3386 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3387 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3388
3389 if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3390 if (tb[IFLA_EXT_MASK])
3391 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3392 }
3393
3394 if (!ext_filter_mask)
3395 return NLMSG_GOODSIZE;
3396 /*
3397 * traverse the list of net devices and compute the minimum
3398 * buffer size based upon the filter mask.
3399 */
3400 rcu_read_lock();
3401 for_each_netdev_rcu(net, dev) {
3402 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
3403 if_nlmsg_size(dev,
3404 ext_filter_mask));
3405 }
3406 rcu_read_unlock();
3407
3408 return nlmsg_total_size(min_ifinfo_dump_size);
3409 }
3410
3411 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3412 {
3413 int idx;
3414 int s_idx = cb->family;
3415 int type = cb->nlh->nlmsg_type - RTM_BASE;
3416 int ret = 0;
3417
3418 if (s_idx == 0)
3419 s_idx = 1;
3420
3421 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3422 struct rtnl_link **tab;
3423 struct rtnl_link *link;
3424 rtnl_dumpit_func dumpit;
3425
3426 if (idx < s_idx || idx == PF_PACKET)
3427 continue;
3428
3429 if (type < 0 || type >= RTM_NR_MSGTYPES)
3430 continue;
3431
3432 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3433 if (!tab)
3434 continue;
3435
3436 link = tab[type];
3437 if (!link)
3438 continue;
3439
3440 dumpit = link->dumpit;
3441 if (!dumpit)
3442 continue;
3443
3444 if (idx > s_idx) {
3445 memset(&cb->args[0], 0, sizeof(cb->args));
3446 cb->prev_seq = 0;
3447 cb->seq = 0;
3448 }
3449 ret = dumpit(skb, cb);
3450 if (ret)
3451 break;
3452 }
3453 cb->family = idx;
3454
3455 return skb->len ? : ret;
3456 }
3457
3458 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3459 unsigned int change,
3460 u32 event, gfp_t flags, int *new_nsid,
3461 int new_ifindex)
3462 {
3463 struct net *net = dev_net(dev);
3464 struct sk_buff *skb;
3465 int err = -ENOBUFS;
3466 size_t if_info_size;
3467
3468 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3469 if (skb == NULL)
3470 goto errout;
3471
3472 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3473 type, 0, 0, change, 0, 0, event,
3474 new_nsid, new_ifindex, -1, flags);
3475 if (err < 0) {
3476 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3477 WARN_ON(err == -EMSGSIZE);
3478 kfree_skb(skb);
3479 goto errout;
3480 }
3481 return skb;
3482 errout:
3483 if (err < 0)
3484 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3485 return NULL;
3486 }
3487
3488 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3489 {
3490 struct net *net = dev_net(dev);
3491
3492 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3493 }
3494
3495 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3496 unsigned int change, u32 event,
3497 gfp_t flags, int *new_nsid, int new_ifindex)
3498 {
3499 struct sk_buff *skb;
3500
3501 if (dev->reg_state != NETREG_REGISTERED)
3502 return;
3503
3504 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3505 new_ifindex);
3506 if (skb)
3507 rtmsg_ifinfo_send(skb, dev, flags);
3508 }
3509
3510 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3511 gfp_t flags)
3512 {
3513 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3514 NULL, 0);
3515 }
3516
3517 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3518 gfp_t flags, int *new_nsid, int new_ifindex)
3519 {
3520 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3521 new_nsid, new_ifindex);
3522 }
3523
3524 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3525 struct net_device *dev,
3526 u8 *addr, u16 vid, u32 pid, u32 seq,
3527 int type, unsigned int flags,
3528 int nlflags, u16 ndm_state)
3529 {
3530 struct nlmsghdr *nlh;
3531 struct ndmsg *ndm;
3532
3533 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3534 if (!nlh)
3535 return -EMSGSIZE;
3536
3537 ndm = nlmsg_data(nlh);
3538 ndm->ndm_family = AF_BRIDGE;
3539 ndm->ndm_pad1 = 0;
3540 ndm->ndm_pad2 = 0;
3541 ndm->ndm_flags = flags;
3542 ndm->ndm_type = 0;
3543 ndm->ndm_ifindex = dev->ifindex;
3544 ndm->ndm_state = ndm_state;
3545
3546 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3547 goto nla_put_failure;
3548 if (vid)
3549 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3550 goto nla_put_failure;
3551
3552 nlmsg_end(skb, nlh);
3553 return 0;
3554
3555 nla_put_failure:
3556 nlmsg_cancel(skb, nlh);
3557 return -EMSGSIZE;
3558 }
3559
3560 static inline size_t rtnl_fdb_nlmsg_size(void)
3561 {
3562 return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3563 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */
3564 nla_total_size(sizeof(u16)) + /* NDA_VLAN */
3565 0;
3566 }
3567
3568 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3569 u16 ndm_state)
3570 {
3571 struct net *net = dev_net(dev);
3572 struct sk_buff *skb;
3573 int err = -ENOBUFS;
3574
3575 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3576 if (!skb)
3577 goto errout;
3578
3579 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3580 0, 0, type, NTF_SELF, 0, ndm_state);
3581 if (err < 0) {
3582 kfree_skb(skb);
3583 goto errout;
3584 }
3585
3586 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3587 return;
3588 errout:
3589 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3590 }
3591
3592 /*
3593 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3594 */
3595 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3596 struct nlattr *tb[],
3597 struct net_device *dev,
3598 const unsigned char *addr, u16 vid,
3599 u16 flags)
3600 {
3601 int err = -EINVAL;
3602
3603 /* If aging addresses are supported device will need to
3604 * implement its own handler for this.
3605 */
3606 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3607 pr_info("%s: FDB only supports static addresses\n", dev->name);
3608 return err;
3609 }
3610
3611 if (vid) {
3612 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3613 return err;
3614 }
3615
3616 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3617 err = dev_uc_add_excl(dev, addr);
3618 else if (is_multicast_ether_addr(addr))
3619 err = dev_mc_add_excl(dev, addr);
3620
3621 /* Only return duplicate errors if NLM_F_EXCL is set */
3622 if (err == -EEXIST && !(flags & NLM_F_EXCL))
3623 err = 0;
3624
3625 return err;
3626 }
3627 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3628
3629 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3630 struct netlink_ext_ack *extack)
3631 {
3632 u16 vid = 0;
3633
3634 if (vlan_attr) {
3635 if (nla_len(vlan_attr) != sizeof(u16)) {
3636 NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3637 return -EINVAL;
3638 }
3639
3640 vid = nla_get_u16(vlan_attr);
3641
3642 if (!vid || vid >= VLAN_VID_MASK) {
3643 NL_SET_ERR_MSG(extack, "invalid vlan id");
3644 return -EINVAL;
3645 }
3646 }
3647 *p_vid = vid;
3648 return 0;
3649 }
3650
3651 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3652 struct netlink_ext_ack *extack)
3653 {
3654 struct net *net = sock_net(skb->sk);
3655 struct ndmsg *ndm;
3656 struct nlattr *tb[NDA_MAX+1];
3657 struct net_device *dev;
3658 u8 *addr;
3659 u16 vid;
3660 int err;
3661
3662 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3663 extack);
3664 if (err < 0)
3665 return err;
3666
3667 ndm = nlmsg_data(nlh);
3668 if (ndm->ndm_ifindex == 0) {
3669 NL_SET_ERR_MSG(extack, "invalid ifindex");
3670 return -EINVAL;
3671 }
3672
3673 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3674 if (dev == NULL) {
3675 NL_SET_ERR_MSG(extack, "unknown ifindex");
3676 return -ENODEV;
3677 }
3678
3679 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3680 NL_SET_ERR_MSG(extack, "invalid address");
3681 return -EINVAL;
3682 }
3683
3684 if (dev->type != ARPHRD_ETHER) {
3685 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
3686 return -EINVAL;
3687 }
3688
3689 addr = nla_data(tb[NDA_LLADDR]);
3690
3691 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3692 if (err)
3693 return err;
3694
3695 err = -EOPNOTSUPP;
3696
3697 /* Support fdb on master device the net/bridge default case */
3698 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3699 (dev->priv_flags & IFF_BRIDGE_PORT)) {
3700 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3701 const struct net_device_ops *ops = br_dev->netdev_ops;
3702
3703 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3704 nlh->nlmsg_flags, extack);
3705 if (err)
3706 goto out;
3707 else
3708 ndm->ndm_flags &= ~NTF_MASTER;
3709 }
3710
3711 /* Embedded bridge, macvlan, and any other device support */
3712 if ((ndm->ndm_flags & NTF_SELF)) {
3713 if (dev->netdev_ops->ndo_fdb_add)
3714 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3715 vid,
3716 nlh->nlmsg_flags,
3717 extack);
3718 else
3719 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3720 nlh->nlmsg_flags);
3721
3722 if (!err) {
3723 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3724 ndm->ndm_state);
3725 ndm->ndm_flags &= ~NTF_SELF;
3726 }
3727 }
3728 out:
3729 return err;
3730 }
3731
3732 /*
3733 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3734 */
3735 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3736 struct nlattr *tb[],
3737 struct net_device *dev,
3738 const unsigned char *addr, u16 vid)
3739 {
3740 int err = -EINVAL;
3741
3742 /* If aging addresses are supported device will need to
3743 * implement its own handler for this.
3744 */
3745 if (!(ndm->ndm_state & NUD_PERMANENT)) {
3746 pr_info("%s: FDB only supports static addresses\n", dev->name);
3747 return err;
3748 }
3749
3750 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3751 err = dev_uc_del(dev, addr);
3752 else if (is_multicast_ether_addr(addr))
3753 err = dev_mc_del(dev, addr);
3754
3755 return err;
3756 }
3757 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3758
3759 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3760 struct netlink_ext_ack *extack)
3761 {
3762 struct net *net = sock_net(skb->sk);
3763 struct ndmsg *ndm;
3764 struct nlattr *tb[NDA_MAX+1];
3765 struct net_device *dev;
3766 int err = -EINVAL;
3767 __u8 *addr;
3768 u16 vid;
3769
3770 if (!netlink_capable(skb, CAP_NET_ADMIN))
3771 return -EPERM;
3772
3773 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3774 extack);
3775 if (err < 0)
3776 return err;
3777
3778 ndm = nlmsg_data(nlh);
3779 if (ndm->ndm_ifindex == 0) {
3780 NL_SET_ERR_MSG(extack, "invalid ifindex");
3781 return -EINVAL;
3782 }
3783
3784 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3785 if (dev == NULL) {
3786 NL_SET_ERR_MSG(extack, "unknown ifindex");
3787 return -ENODEV;
3788 }
3789
3790 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3791 NL_SET_ERR_MSG(extack, "invalid address");
3792 return -EINVAL;
3793 }
3794
3795 if (dev->type != ARPHRD_ETHER) {
3796 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
3797 return -EINVAL;
3798 }
3799
3800 addr = nla_data(tb[NDA_LLADDR]);
3801
3802 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3803 if (err)
3804 return err;
3805
3806 err = -EOPNOTSUPP;
3807
3808 /* Support fdb on master device the net/bridge default case */
3809 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3810 (dev->priv_flags & IFF_BRIDGE_PORT)) {
3811 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3812 const struct net_device_ops *ops = br_dev->netdev_ops;
3813
3814 if (ops->ndo_fdb_del)
3815 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3816
3817 if (err)
3818 goto out;
3819 else
3820 ndm->ndm_flags &= ~NTF_MASTER;
3821 }
3822
3823 /* Embedded bridge, macvlan, and any other device support */
3824 if (ndm->ndm_flags & NTF_SELF) {
3825 if (dev->netdev_ops->ndo_fdb_del)
3826 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3827 vid);
3828 else
3829 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3830
3831 if (!err) {
3832 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3833 ndm->ndm_state);
3834 ndm->ndm_flags &= ~NTF_SELF;
3835 }
3836 }
3837 out:
3838 return err;
3839 }
3840
3841 static int nlmsg_populate_fdb(struct sk_buff *skb,
3842 struct netlink_callback *cb,
3843 struct net_device *dev,
3844 int *idx,
3845 struct netdev_hw_addr_list *list)
3846 {
3847 struct netdev_hw_addr *ha;
3848 int err;
3849 u32 portid, seq;
3850
3851 portid = NETLINK_CB(cb->skb).portid;
3852 seq = cb->nlh->nlmsg_seq;
3853
3854 list_for_each_entry(ha, &list->list, list) {
3855 if (*idx < cb->args[2])
3856 goto skip;
3857
3858 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3859 portid, seq,
3860 RTM_NEWNEIGH, NTF_SELF,
3861 NLM_F_MULTI, NUD_PERMANENT);
3862 if (err < 0)
3863 return err;
3864 skip:
3865 *idx += 1;
3866 }
3867 return 0;
3868 }
3869
3870 /**
3871 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3872 * @skb: socket buffer to store message in
3873 * @cb: netlink callback
3874 * @dev: netdevice
3875 * @filter_dev: ignored
3876 * @idx: the number of FDB table entries dumped is added to *@idx
3877 *
3878 * Default netdevice operation to dump the existing unicast address list.
3879 * Returns number of addresses from list put in skb.
3880 */
3881 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3882 struct netlink_callback *cb,
3883 struct net_device *dev,
3884 struct net_device *filter_dev,
3885 int *idx)
3886 {
3887 int err;
3888
3889 if (dev->type != ARPHRD_ETHER)
3890 return -EINVAL;
3891
3892 netif_addr_lock_bh(dev);
3893 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3894 if (err)
3895 goto out;
3896 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3897 out:
3898 netif_addr_unlock_bh(dev);
3899 return err;
3900 }
3901 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3902
3903 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
3904 int *br_idx, int *brport_idx,
3905 struct netlink_ext_ack *extack)
3906 {
3907 struct nlattr *tb[NDA_MAX + 1];
3908 struct ndmsg *ndm;
3909 int err, i;
3910
3911 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
3912 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
3913 return -EINVAL;
3914 }
3915
3916 ndm = nlmsg_data(nlh);
3917 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state ||
3918 ndm->ndm_flags || ndm->ndm_type) {
3919 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
3920 return -EINVAL;
3921 }
3922
3923 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
3924 NDA_MAX, NULL, extack);
3925 if (err < 0)
3926 return err;
3927
3928 *brport_idx = ndm->ndm_ifindex;
3929 for (i = 0; i <= NDA_MAX; ++i) {
3930 if (!tb[i])
3931 continue;
3932
3933 switch (i) {
3934 case NDA_IFINDEX:
3935 if (nla_len(tb[i]) != sizeof(u32)) {
3936 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
3937 return -EINVAL;
3938 }
3939 *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
3940 break;
3941 case NDA_MASTER:
3942 if (nla_len(tb[i]) != sizeof(u32)) {
3943 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
3944 return -EINVAL;
3945 }
3946 *br_idx = nla_get_u32(tb[NDA_MASTER]);
3947 break;
3948 default:
3949 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
3950 return -EINVAL;
3951 }
3952 }
3953
3954 return 0;
3955 }
3956
3957 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
3958 int *br_idx, int *brport_idx,
3959 struct netlink_ext_ack *extack)
3960 {
3961 struct nlattr *tb[IFLA_MAX+1];
3962 int err;
3963
3964 /* A hack to preserve kernel<->userspace interface.
3965 * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
3966 * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
3967 * So, check for ndmsg with an optional u32 attribute (not used here).
3968 * Fortunately these sizes don't conflict with the size of ifinfomsg
3969 * with an optional attribute.
3970 */
3971 if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
3972 (nlmsg_len(nlh) != sizeof(struct ndmsg) +
3973 nla_attr_size(sizeof(u32)))) {
3974 struct ifinfomsg *ifm;
3975
3976 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
3977 tb, IFLA_MAX, ifla_policy,
3978 extack);
3979 if (err < 0) {
3980 return -EINVAL;
3981 } else if (err == 0) {
3982 if (tb[IFLA_MASTER])
3983 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
3984 }
3985
3986 ifm = nlmsg_data(nlh);
3987 *brport_idx = ifm->ifi_index;
3988 }
3989 return 0;
3990 }
3991
3992 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3993 {
3994 struct net_device *dev;
3995 struct net_device *br_dev = NULL;
3996 const struct net_device_ops *ops = NULL;
3997 const struct net_device_ops *cops = NULL;
3998 struct net *net = sock_net(skb->sk);
3999 struct hlist_head *head;
4000 int brport_idx = 0;
4001 int br_idx = 0;
4002 int h, s_h;
4003 int idx = 0, s_idx;
4004 int err = 0;
4005 int fidx = 0;
4006
4007 if (cb->strict_check)
4008 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4009 cb->extack);
4010 else
4011 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4012 cb->extack);
4013 if (err < 0)
4014 return err;
4015
4016 if (br_idx) {
4017 br_dev = __dev_get_by_index(net, br_idx);
4018 if (!br_dev)
4019 return -ENODEV;
4020
4021 ops = br_dev->netdev_ops;
4022 }
4023
4024 s_h = cb->args[0];
4025 s_idx = cb->args[1];
4026
4027 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4028 idx = 0;
4029 head = &net->dev_index_head[h];
4030 hlist_for_each_entry(dev, head, index_hlist) {
4031
4032 if (brport_idx && (dev->ifindex != brport_idx))
4033 continue;
4034
4035 if (!br_idx) { /* user did not specify a specific bridge */
4036 if (dev->priv_flags & IFF_BRIDGE_PORT) {
4037 br_dev = netdev_master_upper_dev_get(dev);
4038 cops = br_dev->netdev_ops;
4039 }
4040 } else {
4041 if (dev != br_dev &&
4042 !(dev->priv_flags & IFF_BRIDGE_PORT))
4043 continue;
4044
4045 if (br_dev != netdev_master_upper_dev_get(dev) &&
4046 !(dev->priv_flags & IFF_EBRIDGE))
4047 continue;
4048 cops = ops;
4049 }
4050
4051 if (idx < s_idx)
4052 goto cont;
4053
4054 if (dev->priv_flags & IFF_BRIDGE_PORT) {
4055 if (cops && cops->ndo_fdb_dump) {
4056 err = cops->ndo_fdb_dump(skb, cb,
4057 br_dev, dev,
4058 &fidx);
4059 if (err == -EMSGSIZE)
4060 goto out;
4061 }
4062 }
4063
4064 if (dev->netdev_ops->ndo_fdb_dump)
4065 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4066 dev, NULL,
4067 &fidx);
4068 else
4069 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4070 &fidx);
4071 if (err == -EMSGSIZE)
4072 goto out;
4073
4074 cops = NULL;
4075
4076 /* reset fdb offset to 0 for rest of the interfaces */
4077 cb->args[2] = 0;
4078 fidx = 0;
4079 cont:
4080 idx++;
4081 }
4082 }
4083
4084 out:
4085 cb->args[0] = h;
4086 cb->args[1] = idx;
4087 cb->args[2] = fidx;
4088
4089 return skb->len;
4090 }
4091
4092 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4093 struct nlattr **tb, u8 *ndm_flags,
4094 int *br_idx, int *brport_idx, u8 **addr,
4095 u16 *vid, struct netlink_ext_ack *extack)
4096 {
4097 struct ndmsg *ndm;
4098 int err, i;
4099
4100 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4101 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4102 return -EINVAL;
4103 }
4104
4105 ndm = nlmsg_data(nlh);
4106 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state ||
4107 ndm->ndm_type) {
4108 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4109 return -EINVAL;
4110 }
4111
4112 if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4113 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4114 return -EINVAL;
4115 }
4116
4117 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4118 NDA_MAX, nda_policy, extack);
4119 if (err < 0)
4120 return err;
4121
4122 *ndm_flags = ndm->ndm_flags;
4123 *brport_idx = ndm->ndm_ifindex;
4124 for (i = 0; i <= NDA_MAX; ++i) {
4125 if (!tb[i])
4126 continue;
4127
4128 switch (i) {
4129 case NDA_MASTER:
4130 *br_idx = nla_get_u32(tb[i]);
4131 break;
4132 case NDA_LLADDR:
4133 if (nla_len(tb[i]) != ETH_ALEN) {
4134 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4135 return -EINVAL;
4136 }
4137 *addr = nla_data(tb[i]);
4138 break;
4139 case NDA_VLAN:
4140 err = fdb_vid_parse(tb[i], vid, extack);
4141 if (err)
4142 return err;
4143 break;
4144 case NDA_VNI:
4145 break;
4146 default:
4147 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4148 return -EINVAL;
4149 }
4150 }
4151
4152 return 0;
4153 }
4154
4155 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4156 struct netlink_ext_ack *extack)
4157 {
4158 struct net_device *dev = NULL, *br_dev = NULL;
4159 const struct net_device_ops *ops = NULL;
4160 struct net *net = sock_net(in_skb->sk);
4161 struct nlattr *tb[NDA_MAX + 1];
4162 struct sk_buff *skb;
4163 int brport_idx = 0;
4164 u8 ndm_flags = 0;
4165 int br_idx = 0;
4166 u8 *addr = NULL;
4167 u16 vid = 0;
4168 int err;
4169
4170 err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4171 &brport_idx, &addr, &vid, extack);
4172 if (err < 0)
4173 return err;
4174
4175 if (!addr) {
4176 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4177 return -EINVAL;
4178 }
4179
4180 if (brport_idx) {
4181 dev = __dev_get_by_index(net, brport_idx);
4182 if (!dev) {
4183 NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4184 return -ENODEV;
4185 }
4186 }
4187
4188 if (br_idx) {
4189 if (dev) {
4190 NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4191 return -EINVAL;
4192 }
4193
4194 br_dev = __dev_get_by_index(net, br_idx);
4195 if (!br_dev) {
4196 NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4197 return -EINVAL;
4198 }
4199 ops = br_dev->netdev_ops;
4200 }
4201
4202 if (dev) {
4203 if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4204 if (!(dev->priv_flags & IFF_BRIDGE_PORT)) {
4205 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4206 return -EINVAL;
4207 }
4208 br_dev = netdev_master_upper_dev_get(dev);
4209 if (!br_dev) {
4210 NL_SET_ERR_MSG(extack, "Master of device not found");
4211 return -EINVAL;
4212 }
4213 ops = br_dev->netdev_ops;
4214 } else {
4215 if (!(ndm_flags & NTF_SELF)) {
4216 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4217 return -EINVAL;
4218 }
4219 ops = dev->netdev_ops;
4220 }
4221 }
4222
4223 if (!br_dev && !dev) {
4224 NL_SET_ERR_MSG(extack, "No device specified");
4225 return -ENODEV;
4226 }
4227
4228 if (!ops || !ops->ndo_fdb_get) {
4229 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4230 return -EOPNOTSUPP;
4231 }
4232
4233 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4234 if (!skb)
4235 return -ENOBUFS;
4236
4237 if (br_dev)
4238 dev = br_dev;
4239 err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4240 NETLINK_CB(in_skb).portid,
4241 nlh->nlmsg_seq, extack);
4242 if (err)
4243 goto out;
4244
4245 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4246 out:
4247 kfree_skb(skb);
4248 return err;
4249 }
4250
4251 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4252 unsigned int attrnum, unsigned int flag)
4253 {
4254 if (mask & flag)
4255 return nla_put_u8(skb, attrnum, !!(flags & flag));
4256 return 0;
4257 }
4258
4259 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4260 struct net_device *dev, u16 mode,
4261 u32 flags, u32 mask, int nlflags,
4262 u32 filter_mask,
4263 int (*vlan_fill)(struct sk_buff *skb,
4264 struct net_device *dev,
4265 u32 filter_mask))
4266 {
4267 struct nlmsghdr *nlh;
4268 struct ifinfomsg *ifm;
4269 struct nlattr *br_afspec;
4270 struct nlattr *protinfo;
4271 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4272 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4273 int err = 0;
4274
4275 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4276 if (nlh == NULL)
4277 return -EMSGSIZE;
4278
4279 ifm = nlmsg_data(nlh);
4280 ifm->ifi_family = AF_BRIDGE;
4281 ifm->__ifi_pad = 0;
4282 ifm->ifi_type = dev->type;
4283 ifm->ifi_index = dev->ifindex;
4284 ifm->ifi_flags = dev_get_flags(dev);
4285 ifm->ifi_change = 0;
4286
4287
4288 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4289 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4290 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4291 (br_dev &&
4292 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4293 (dev->addr_len &&
4294 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4295 (dev->ifindex != dev_get_iflink(dev) &&
4296 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4297 goto nla_put_failure;
4298
4299 br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4300 if (!br_afspec)
4301 goto nla_put_failure;
4302
4303 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4304 nla_nest_cancel(skb, br_afspec);
4305 goto nla_put_failure;
4306 }
4307
4308 if (mode != BRIDGE_MODE_UNDEF) {
4309 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4310 nla_nest_cancel(skb, br_afspec);
4311 goto nla_put_failure;
4312 }
4313 }
4314 if (vlan_fill) {
4315 err = vlan_fill(skb, dev, filter_mask);
4316 if (err) {
4317 nla_nest_cancel(skb, br_afspec);
4318 goto nla_put_failure;
4319 }
4320 }
4321 nla_nest_end(skb, br_afspec);
4322
4323 protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4324 if (!protinfo)
4325 goto nla_put_failure;
4326
4327 if (brport_nla_put_flag(skb, flags, mask,
4328 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4329 brport_nla_put_flag(skb, flags, mask,
4330 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4331 brport_nla_put_flag(skb, flags, mask,
4332 IFLA_BRPORT_FAST_LEAVE,
4333 BR_MULTICAST_FAST_LEAVE) ||
4334 brport_nla_put_flag(skb, flags, mask,
4335 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4336 brport_nla_put_flag(skb, flags, mask,
4337 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4338 brport_nla_put_flag(skb, flags, mask,
4339 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4340 brport_nla_put_flag(skb, flags, mask,
4341 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4342 brport_nla_put_flag(skb, flags, mask,
4343 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
4344 nla_nest_cancel(skb, protinfo);
4345 goto nla_put_failure;
4346 }
4347
4348 nla_nest_end(skb, protinfo);
4349
4350 nlmsg_end(skb, nlh);
4351 return 0;
4352 nla_put_failure:
4353 nlmsg_cancel(skb, nlh);
4354 return err ? err : -EMSGSIZE;
4355 }
4356 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4357
4358 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4359 bool strict_check, u32 *filter_mask,
4360 struct netlink_ext_ack *extack)
4361 {
4362 struct nlattr *tb[IFLA_MAX+1];
4363 int err, i;
4364
4365 if (strict_check) {
4366 struct ifinfomsg *ifm;
4367
4368 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4369 NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4370 return -EINVAL;
4371 }
4372
4373 ifm = nlmsg_data(nlh);
4374 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4375 ifm->ifi_change || ifm->ifi_index) {
4376 NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4377 return -EINVAL;
4378 }
4379
4380 err = nlmsg_parse_deprecated_strict(nlh,
4381 sizeof(struct ifinfomsg),
4382 tb, IFLA_MAX, ifla_policy,
4383 extack);
4384 } else {
4385 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4386 tb, IFLA_MAX, ifla_policy,
4387 extack);
4388 }
4389 if (err < 0)
4390 return err;
4391
4392 /* new attributes should only be added with strict checking */
4393 for (i = 0; i <= IFLA_MAX; ++i) {
4394 if (!tb[i])
4395 continue;
4396
4397 switch (i) {
4398 case IFLA_EXT_MASK:
4399 *filter_mask = nla_get_u32(tb[i]);
4400 break;
4401 default:
4402 if (strict_check) {
4403 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4404 return -EINVAL;
4405 }
4406 }
4407 }
4408
4409 return 0;
4410 }
4411
4412 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4413 {
4414 const struct nlmsghdr *nlh = cb->nlh;
4415 struct net *net = sock_net(skb->sk);
4416 struct net_device *dev;
4417 int idx = 0;
4418 u32 portid = NETLINK_CB(cb->skb).portid;
4419 u32 seq = nlh->nlmsg_seq;
4420 u32 filter_mask = 0;
4421 int err;
4422
4423 err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4424 cb->extack);
4425 if (err < 0 && cb->strict_check)
4426 return err;
4427
4428 rcu_read_lock();
4429 for_each_netdev_rcu(net, dev) {
4430 const struct net_device_ops *ops = dev->netdev_ops;
4431 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4432
4433 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4434 if (idx >= cb->args[0]) {
4435 err = br_dev->netdev_ops->ndo_bridge_getlink(
4436 skb, portid, seq, dev,
4437 filter_mask, NLM_F_MULTI);
4438 if (err < 0 && err != -EOPNOTSUPP) {
4439 if (likely(skb->len))
4440 break;
4441
4442 goto out_err;
4443 }
4444 }
4445 idx++;
4446 }
4447
4448 if (ops->ndo_bridge_getlink) {
4449 if (idx >= cb->args[0]) {
4450 err = ops->ndo_bridge_getlink(skb, portid,
4451 seq, dev,
4452 filter_mask,
4453 NLM_F_MULTI);
4454 if (err < 0 && err != -EOPNOTSUPP) {
4455 if (likely(skb->len))
4456 break;
4457
4458 goto out_err;
4459 }
4460 }
4461 idx++;
4462 }
4463 }
4464 err = skb->len;
4465 out_err:
4466 rcu_read_unlock();
4467 cb->args[0] = idx;
4468
4469 return err;
4470 }
4471
4472 static inline size_t bridge_nlmsg_size(void)
4473 {
4474 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4475 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4476 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4477 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
4478 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
4479 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
4480 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
4481 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
4482 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
4483 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
4484 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
4485 }
4486
4487 static int rtnl_bridge_notify(struct net_device *dev)
4488 {
4489 struct net *net = dev_net(dev);
4490 struct sk_buff *skb;
4491 int err = -EOPNOTSUPP;
4492
4493 if (!dev->netdev_ops->ndo_bridge_getlink)
4494 return 0;
4495
4496 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4497 if (!skb) {
4498 err = -ENOMEM;
4499 goto errout;
4500 }
4501
4502 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4503 if (err < 0)
4504 goto errout;
4505
4506 if (!skb->len)
4507 goto errout;
4508
4509 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4510 return 0;
4511 errout:
4512 WARN_ON(err == -EMSGSIZE);
4513 kfree_skb(skb);
4514 if (err)
4515 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4516 return err;
4517 }
4518
4519 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4520 struct netlink_ext_ack *extack)
4521 {
4522 struct net *net = sock_net(skb->sk);
4523 struct ifinfomsg *ifm;
4524 struct net_device *dev;
4525 struct nlattr *br_spec, *attr = NULL;
4526 int rem, err = -EOPNOTSUPP;
4527 u16 flags = 0;
4528 bool have_flags = false;
4529
4530 if (nlmsg_len(nlh) < sizeof(*ifm))
4531 return -EINVAL;
4532
4533 ifm = nlmsg_data(nlh);
4534 if (ifm->ifi_family != AF_BRIDGE)
4535 return -EPFNOSUPPORT;
4536
4537 dev = __dev_get_by_index(net, ifm->ifi_index);
4538 if (!dev) {
4539 NL_SET_ERR_MSG(extack, "unknown ifindex");
4540 return -ENODEV;
4541 }
4542
4543 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4544 if (br_spec) {
4545 nla_for_each_nested(attr, br_spec, rem) {
4546 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4547 if (nla_len(attr) < sizeof(flags))
4548 return -EINVAL;
4549
4550 have_flags = true;
4551 flags = nla_get_u16(attr);
4552 break;
4553 }
4554 }
4555 }
4556
4557 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4558 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4559
4560 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4561 err = -EOPNOTSUPP;
4562 goto out;
4563 }
4564
4565 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
4566 extack);
4567 if (err)
4568 goto out;
4569
4570 flags &= ~BRIDGE_FLAGS_MASTER;
4571 }
4572
4573 if ((flags & BRIDGE_FLAGS_SELF)) {
4574 if (!dev->netdev_ops->ndo_bridge_setlink)
4575 err = -EOPNOTSUPP;
4576 else
4577 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4578 flags,
4579 extack);
4580 if (!err) {
4581 flags &= ~BRIDGE_FLAGS_SELF;
4582
4583 /* Generate event to notify upper layer of bridge
4584 * change
4585 */
4586 err = rtnl_bridge_notify(dev);
4587 }
4588 }
4589
4590 if (have_flags)
4591 memcpy(nla_data(attr), &flags, sizeof(flags));
4592 out:
4593 return err;
4594 }
4595
4596 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4597 struct netlink_ext_ack *extack)
4598 {
4599 struct net *net = sock_net(skb->sk);
4600 struct ifinfomsg *ifm;
4601 struct net_device *dev;
4602 struct nlattr *br_spec, *attr = NULL;
4603 int rem, err = -EOPNOTSUPP;
4604 u16 flags = 0;
4605 bool have_flags = false;
4606
4607 if (nlmsg_len(nlh) < sizeof(*ifm))
4608 return -EINVAL;
4609
4610 ifm = nlmsg_data(nlh);
4611 if (ifm->ifi_family != AF_BRIDGE)
4612 return -EPFNOSUPPORT;
4613
4614 dev = __dev_get_by_index(net, ifm->ifi_index);
4615 if (!dev) {
4616 NL_SET_ERR_MSG(extack, "unknown ifindex");
4617 return -ENODEV;
4618 }
4619
4620 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4621 if (br_spec) {
4622 nla_for_each_nested(attr, br_spec, rem) {
4623 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4624 if (nla_len(attr) < sizeof(flags))
4625 return -EINVAL;
4626
4627 have_flags = true;
4628 flags = nla_get_u16(attr);
4629 break;
4630 }
4631 }
4632 }
4633
4634 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4635 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4636
4637 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4638 err = -EOPNOTSUPP;
4639 goto out;
4640 }
4641
4642 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4643 if (err)
4644 goto out;
4645
4646 flags &= ~BRIDGE_FLAGS_MASTER;
4647 }
4648
4649 if ((flags & BRIDGE_FLAGS_SELF)) {
4650 if (!dev->netdev_ops->ndo_bridge_dellink)
4651 err = -EOPNOTSUPP;
4652 else
4653 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
4654 flags);
4655
4656 if (!err) {
4657 flags &= ~BRIDGE_FLAGS_SELF;
4658
4659 /* Generate event to notify upper layer of bridge
4660 * change
4661 */
4662 err = rtnl_bridge_notify(dev);
4663 }
4664 }
4665
4666 if (have_flags)
4667 memcpy(nla_data(attr), &flags, sizeof(flags));
4668 out:
4669 return err;
4670 }
4671
4672 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
4673 {
4674 return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
4675 (!idxattr || idxattr == attrid);
4676 }
4677
4678 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
4679 static int rtnl_get_offload_stats_attr_size(int attr_id)
4680 {
4681 switch (attr_id) {
4682 case IFLA_OFFLOAD_XSTATS_CPU_HIT:
4683 return sizeof(struct rtnl_link_stats64);
4684 }
4685
4686 return 0;
4687 }
4688
4689 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
4690 int *prividx)
4691 {
4692 struct nlattr *attr = NULL;
4693 int attr_id, size;
4694 void *attr_data;
4695 int err;
4696
4697 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4698 dev->netdev_ops->ndo_get_offload_stats))
4699 return -ENODATA;
4700
4701 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4702 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4703 if (attr_id < *prividx)
4704 continue;
4705
4706 size = rtnl_get_offload_stats_attr_size(attr_id);
4707 if (!size)
4708 continue;
4709
4710 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4711 continue;
4712
4713 attr = nla_reserve_64bit(skb, attr_id, size,
4714 IFLA_OFFLOAD_XSTATS_UNSPEC);
4715 if (!attr)
4716 goto nla_put_failure;
4717
4718 attr_data = nla_data(attr);
4719 memset(attr_data, 0, size);
4720 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
4721 attr_data);
4722 if (err)
4723 goto get_offload_stats_failure;
4724 }
4725
4726 if (!attr)
4727 return -ENODATA;
4728
4729 *prividx = 0;
4730 return 0;
4731
4732 nla_put_failure:
4733 err = -EMSGSIZE;
4734 get_offload_stats_failure:
4735 *prividx = attr_id;
4736 return err;
4737 }
4738
4739 static int rtnl_get_offload_stats_size(const struct net_device *dev)
4740 {
4741 int nla_size = 0;
4742 int attr_id;
4743 int size;
4744
4745 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4746 dev->netdev_ops->ndo_get_offload_stats))
4747 return 0;
4748
4749 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4750 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4751 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4752 continue;
4753 size = rtnl_get_offload_stats_attr_size(attr_id);
4754 nla_size += nla_total_size_64bit(size);
4755 }
4756
4757 if (nla_size != 0)
4758 nla_size += nla_total_size(0);
4759
4760 return nla_size;
4761 }
4762
4763 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
4764 int type, u32 pid, u32 seq, u32 change,
4765 unsigned int flags, unsigned int filter_mask,
4766 int *idxattr, int *prividx)
4767 {
4768 struct if_stats_msg *ifsm;
4769 struct nlmsghdr *nlh;
4770 struct nlattr *attr;
4771 int s_prividx = *prividx;
4772 int err;
4773
4774 ASSERT_RTNL();
4775
4776 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
4777 if (!nlh)
4778 return -EMSGSIZE;
4779
4780 ifsm = nlmsg_data(nlh);
4781 ifsm->family = PF_UNSPEC;
4782 ifsm->pad1 = 0;
4783 ifsm->pad2 = 0;
4784 ifsm->ifindex = dev->ifindex;
4785 ifsm->filter_mask = filter_mask;
4786
4787 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
4788 struct rtnl_link_stats64 *sp;
4789
4790 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
4791 sizeof(struct rtnl_link_stats64),
4792 IFLA_STATS_UNSPEC);
4793 if (!attr)
4794 goto nla_put_failure;
4795
4796 sp = nla_data(attr);
4797 dev_get_stats(dev, sp);
4798 }
4799
4800 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
4801 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4802
4803 if (ops && ops->fill_linkxstats) {
4804 *idxattr = IFLA_STATS_LINK_XSTATS;
4805 attr = nla_nest_start_noflag(skb,
4806 IFLA_STATS_LINK_XSTATS);
4807 if (!attr)
4808 goto nla_put_failure;
4809
4810 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4811 nla_nest_end(skb, attr);
4812 if (err)
4813 goto nla_put_failure;
4814 *idxattr = 0;
4815 }
4816 }
4817
4818 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
4819 *idxattr)) {
4820 const struct rtnl_link_ops *ops = NULL;
4821 const struct net_device *master;
4822
4823 master = netdev_master_upper_dev_get(dev);
4824 if (master)
4825 ops = master->rtnl_link_ops;
4826 if (ops && ops->fill_linkxstats) {
4827 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
4828 attr = nla_nest_start_noflag(skb,
4829 IFLA_STATS_LINK_XSTATS_SLAVE);
4830 if (!attr)
4831 goto nla_put_failure;
4832
4833 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4834 nla_nest_end(skb, attr);
4835 if (err)
4836 goto nla_put_failure;
4837 *idxattr = 0;
4838 }
4839 }
4840
4841 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
4842 *idxattr)) {
4843 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
4844 attr = nla_nest_start_noflag(skb,
4845 IFLA_STATS_LINK_OFFLOAD_XSTATS);
4846 if (!attr)
4847 goto nla_put_failure;
4848
4849 err = rtnl_get_offload_stats(skb, dev, prividx);
4850 if (err == -ENODATA)
4851 nla_nest_cancel(skb, attr);
4852 else
4853 nla_nest_end(skb, attr);
4854
4855 if (err && err != -ENODATA)
4856 goto nla_put_failure;
4857 *idxattr = 0;
4858 }
4859
4860 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
4861 struct rtnl_af_ops *af_ops;
4862
4863 *idxattr = IFLA_STATS_AF_SPEC;
4864 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
4865 if (!attr)
4866 goto nla_put_failure;
4867
4868 rcu_read_lock();
4869 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4870 if (af_ops->fill_stats_af) {
4871 struct nlattr *af;
4872 int err;
4873
4874 af = nla_nest_start_noflag(skb,
4875 af_ops->family);
4876 if (!af) {
4877 rcu_read_unlock();
4878 goto nla_put_failure;
4879 }
4880 err = af_ops->fill_stats_af(skb, dev);
4881
4882 if (err == -ENODATA) {
4883 nla_nest_cancel(skb, af);
4884 } else if (err < 0) {
4885 rcu_read_unlock();
4886 goto nla_put_failure;
4887 }
4888
4889 nla_nest_end(skb, af);
4890 }
4891 }
4892 rcu_read_unlock();
4893
4894 nla_nest_end(skb, attr);
4895
4896 *idxattr = 0;
4897 }
4898
4899 nlmsg_end(skb, nlh);
4900
4901 return 0;
4902
4903 nla_put_failure:
4904 /* not a multi message or no progress mean a real error */
4905 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
4906 nlmsg_cancel(skb, nlh);
4907 else
4908 nlmsg_end(skb, nlh);
4909
4910 return -EMSGSIZE;
4911 }
4912
4913 static size_t if_nlmsg_stats_size(const struct net_device *dev,
4914 u32 filter_mask)
4915 {
4916 size_t size = 0;
4917
4918 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
4919 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
4920
4921 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
4922 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4923 int attr = IFLA_STATS_LINK_XSTATS;
4924
4925 if (ops && ops->get_linkxstats_size) {
4926 size += nla_total_size(ops->get_linkxstats_size(dev,
4927 attr));
4928 /* for IFLA_STATS_LINK_XSTATS */
4929 size += nla_total_size(0);
4930 }
4931 }
4932
4933 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
4934 struct net_device *_dev = (struct net_device *)dev;
4935 const struct rtnl_link_ops *ops = NULL;
4936 const struct net_device *master;
4937
4938 /* netdev_master_upper_dev_get can't take const */
4939 master = netdev_master_upper_dev_get(_dev);
4940 if (master)
4941 ops = master->rtnl_link_ops;
4942 if (ops && ops->get_linkxstats_size) {
4943 int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
4944
4945 size += nla_total_size(ops->get_linkxstats_size(dev,
4946 attr));
4947 /* for IFLA_STATS_LINK_XSTATS_SLAVE */
4948 size += nla_total_size(0);
4949 }
4950 }
4951
4952 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
4953 size += rtnl_get_offload_stats_size(dev);
4954
4955 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
4956 struct rtnl_af_ops *af_ops;
4957
4958 /* for IFLA_STATS_AF_SPEC */
4959 size += nla_total_size(0);
4960
4961 rcu_read_lock();
4962 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4963 if (af_ops->get_stats_af_size) {
4964 size += nla_total_size(
4965 af_ops->get_stats_af_size(dev));
4966
4967 /* for AF_* */
4968 size += nla_total_size(0);
4969 }
4970 }
4971 rcu_read_unlock();
4972 }
4973
4974 return size;
4975 }
4976
4977 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
4978 bool is_dump, struct netlink_ext_ack *extack)
4979 {
4980 struct if_stats_msg *ifsm;
4981
4982 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
4983 NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
4984 return -EINVAL;
4985 }
4986
4987 if (!strict_check)
4988 return 0;
4989
4990 ifsm = nlmsg_data(nlh);
4991
4992 /* only requests using strict checks can pass data to influence
4993 * the dump. The legacy exception is filter_mask.
4994 */
4995 if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
4996 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
4997 return -EINVAL;
4998 }
4999 if (nlmsg_attrlen(nlh, sizeof(*ifsm))) {
5000 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
5001 return -EINVAL;
5002 }
5003 if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5004 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5005 return -EINVAL;
5006 }
5007
5008 return 0;
5009 }
5010
5011 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5012 struct netlink_ext_ack *extack)
5013 {
5014 struct net *net = sock_net(skb->sk);
5015 struct net_device *dev = NULL;
5016 int idxattr = 0, prividx = 0;
5017 struct if_stats_msg *ifsm;
5018 struct sk_buff *nskb;
5019 u32 filter_mask;
5020 int err;
5021
5022 err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5023 false, extack);
5024 if (err)
5025 return err;
5026
5027 ifsm = nlmsg_data(nlh);
5028 if (ifsm->ifindex > 0)
5029 dev = __dev_get_by_index(net, ifsm->ifindex);
5030 else
5031 return -EINVAL;
5032
5033 if (!dev)
5034 return -ENODEV;
5035
5036 filter_mask = ifsm->filter_mask;
5037 if (!filter_mask)
5038 return -EINVAL;
5039
5040 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
5041 if (!nskb)
5042 return -ENOBUFS;
5043
5044 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5045 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5046 0, filter_mask, &idxattr, &prividx);
5047 if (err < 0) {
5048 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5049 WARN_ON(err == -EMSGSIZE);
5050 kfree_skb(nskb);
5051 } else {
5052 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5053 }
5054
5055 return err;
5056 }
5057
5058 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5059 {
5060 struct netlink_ext_ack *extack = cb->extack;
5061 int h, s_h, err, s_idx, s_idxattr, s_prividx;
5062 struct net *net = sock_net(skb->sk);
5063 unsigned int flags = NLM_F_MULTI;
5064 struct if_stats_msg *ifsm;
5065 struct hlist_head *head;
5066 struct net_device *dev;
5067 u32 filter_mask = 0;
5068 int idx = 0;
5069
5070 s_h = cb->args[0];
5071 s_idx = cb->args[1];
5072 s_idxattr = cb->args[2];
5073 s_prividx = cb->args[3];
5074
5075 cb->seq = net->dev_base_seq;
5076
5077 err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5078 if (err)
5079 return err;
5080
5081 ifsm = nlmsg_data(cb->nlh);
5082 filter_mask = ifsm->filter_mask;
5083 if (!filter_mask) {
5084 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5085 return -EINVAL;
5086 }
5087
5088 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5089 idx = 0;
5090 head = &net->dev_index_head[h];
5091 hlist_for_each_entry(dev, head, index_hlist) {
5092 if (idx < s_idx)
5093 goto cont;
5094 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5095 NETLINK_CB(cb->skb).portid,
5096 cb->nlh->nlmsg_seq, 0,
5097 flags, filter_mask,
5098 &s_idxattr, &s_prividx);
5099 /* If we ran out of room on the first message,
5100 * we're in trouble
5101 */
5102 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5103
5104 if (err < 0)
5105 goto out;
5106 s_prividx = 0;
5107 s_idxattr = 0;
5108 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5109 cont:
5110 idx++;
5111 }
5112 }
5113 out:
5114 cb->args[3] = s_prividx;
5115 cb->args[2] = s_idxattr;
5116 cb->args[1] = idx;
5117 cb->args[0] = h;
5118
5119 return skb->len;
5120 }
5121
5122 /* Process one rtnetlink message. */
5123
5124 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5125 struct netlink_ext_ack *extack)
5126 {
5127 struct net *net = sock_net(skb->sk);
5128 struct rtnl_link *link;
5129 struct module *owner;
5130 int err = -EOPNOTSUPP;
5131 rtnl_doit_func doit;
5132 unsigned int flags;
5133 int kind;
5134 int family;
5135 int type;
5136
5137 type = nlh->nlmsg_type;
5138 if (type > RTM_MAX)
5139 return -EOPNOTSUPP;
5140
5141 type -= RTM_BASE;
5142
5143 /* All the messages must have at least 1 byte length */
5144 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
5145 return 0;
5146
5147 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
5148 kind = type&3;
5149
5150 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
5151 return -EPERM;
5152
5153 rcu_read_lock();
5154 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
5155 struct sock *rtnl;
5156 rtnl_dumpit_func dumpit;
5157 u16 min_dump_alloc = 0;
5158
5159 link = rtnl_get_link(family, type);
5160 if (!link || !link->dumpit) {
5161 family = PF_UNSPEC;
5162 link = rtnl_get_link(family, type);
5163 if (!link || !link->dumpit)
5164 goto err_unlock;
5165 }
5166 owner = link->owner;
5167 dumpit = link->dumpit;
5168
5169 if (type == RTM_GETLINK - RTM_BASE)
5170 min_dump_alloc = rtnl_calcit(skb, nlh);
5171
5172 err = 0;
5173 /* need to do this before rcu_read_unlock() */
5174 if (!try_module_get(owner))
5175 err = -EPROTONOSUPPORT;
5176
5177 rcu_read_unlock();
5178
5179 rtnl = net->rtnl;
5180 if (err == 0) {
5181 struct netlink_dump_control c = {
5182 .dump = dumpit,
5183 .min_dump_alloc = min_dump_alloc,
5184 .module = owner,
5185 };
5186 err = netlink_dump_start(rtnl, skb, nlh, &c);
5187 /* netlink_dump_start() will keep a reference on
5188 * module if dump is still in progress.
5189 */
5190 module_put(owner);
5191 }
5192 return err;
5193 }
5194
5195 link = rtnl_get_link(family, type);
5196 if (!link || !link->doit) {
5197 family = PF_UNSPEC;
5198 link = rtnl_get_link(PF_UNSPEC, type);
5199 if (!link || !link->doit)
5200 goto out_unlock;
5201 }
5202
5203 owner = link->owner;
5204 if (!try_module_get(owner)) {
5205 err = -EPROTONOSUPPORT;
5206 goto out_unlock;
5207 }
5208
5209 flags = link->flags;
5210 if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
5211 doit = link->doit;
5212 rcu_read_unlock();
5213 if (doit)
5214 err = doit(skb, nlh, extack);
5215 module_put(owner);
5216 return err;
5217 }
5218 rcu_read_unlock();
5219
5220 rtnl_lock();
5221 link = rtnl_get_link(family, type);
5222 if (link && link->doit)
5223 err = link->doit(skb, nlh, extack);
5224 rtnl_unlock();
5225
5226 module_put(owner);
5227
5228 return err;
5229
5230 out_unlock:
5231 rcu_read_unlock();
5232 return err;
5233
5234 err_unlock:
5235 rcu_read_unlock();
5236 return -EOPNOTSUPP;
5237 }
5238
5239 static void rtnetlink_rcv(struct sk_buff *skb)
5240 {
5241 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
5242 }
5243
5244 static int rtnetlink_bind(struct net *net, int group)
5245 {
5246 switch (group) {
5247 case RTNLGRP_IPV4_MROUTE_R:
5248 case RTNLGRP_IPV6_MROUTE_R:
5249 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5250 return -EPERM;
5251 break;
5252 }
5253 return 0;
5254 }
5255
5256 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
5257 {
5258 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5259
5260 switch (event) {
5261 case NETDEV_REBOOT:
5262 case NETDEV_CHANGEMTU:
5263 case NETDEV_CHANGEADDR:
5264 case NETDEV_CHANGENAME:
5265 case NETDEV_FEAT_CHANGE:
5266 case NETDEV_BONDING_FAILOVER:
5267 case NETDEV_POST_TYPE_CHANGE:
5268 case NETDEV_NOTIFY_PEERS:
5269 case NETDEV_CHANGEUPPER:
5270 case NETDEV_RESEND_IGMP:
5271 case NETDEV_CHANGEINFODATA:
5272 case NETDEV_CHANGELOWERSTATE:
5273 case NETDEV_CHANGE_TX_QUEUE_LEN:
5274 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
5275 GFP_KERNEL, NULL, 0);
5276 break;
5277 default:
5278 break;
5279 }
5280 return NOTIFY_DONE;
5281 }
5282
5283 static struct notifier_block rtnetlink_dev_notifier = {
5284 .notifier_call = rtnetlink_event,
5285 };
5286
5287
5288 static int __net_init rtnetlink_net_init(struct net *net)
5289 {
5290 struct sock *sk;
5291 struct netlink_kernel_cfg cfg = {
5292 .groups = RTNLGRP_MAX,
5293 .input = rtnetlink_rcv,
5294 .cb_mutex = &rtnl_mutex,
5295 .flags = NL_CFG_F_NONROOT_RECV,
5296 .bind = rtnetlink_bind,
5297 };
5298
5299 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
5300 if (!sk)
5301 return -ENOMEM;
5302 net->rtnl = sk;
5303 return 0;
5304 }
5305
5306 static void __net_exit rtnetlink_net_exit(struct net *net)
5307 {
5308 netlink_kernel_release(net->rtnl);
5309 net->rtnl = NULL;
5310 }
5311
5312 static struct pernet_operations rtnetlink_net_ops = {
5313 .init = rtnetlink_net_init,
5314 .exit = rtnetlink_net_exit,
5315 };
5316
5317 void __init rtnetlink_init(void)
5318 {
5319 if (register_pernet_subsys(&rtnetlink_net_ops))
5320 panic("rtnetlink_init: cannot initialize rtnetlink\n");
5321
5322 register_netdevice_notifier(&rtnetlink_dev_notifier);
5323
5324 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
5325 rtnl_dump_ifinfo, 0);
5326 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
5327 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
5328 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
5329
5330 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
5331 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
5332 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
5333
5334 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
5335 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
5336 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
5337
5338 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
5339 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
5340 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
5341
5342 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
5343 0);
5344 }
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