xref: /linux/net/core/rtnetlink.c (revision e8f4aa6087fa80732382881ef7c0c96733bb1984)
1 /*
2  * INET		An implementation of the TCP/IP protocol suite for the LINUX
3  *		operating system.  INET is implemented using the  BSD Socket
4  *		interface as the means of communication with the user level.
5  *
6  *		Routing netlink socket interface: protocol independent part.
7  *
8  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9  *
10  *		This program is free software; you can redistribute it and/or
11  *		modify it under the terms of the GNU General Public License
12  *		as published by the Free Software Foundation; either version
13  *		2 of the License, or (at your option) any later version.
14  *
15  *	Fixes:
16  *	Vitaly E. Lavrov		RTA_OK arithmetics was wrong.
17  */
18 
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/if_bridge.h>
39 #include <linux/if_vlan.h>
40 #include <linux/pci.h>
41 #include <linux/etherdevice.h>
42 
43 #include <asm/uaccess.h>
44 
45 #include <linux/inet.h>
46 #include <linux/netdevice.h>
47 #include <net/switchdev.h>
48 #include <net/ip.h>
49 #include <net/protocol.h>
50 #include <net/arp.h>
51 #include <net/route.h>
52 #include <net/udp.h>
53 #include <net/tcp.h>
54 #include <net/sock.h>
55 #include <net/pkt_sched.h>
56 #include <net/fib_rules.h>
57 #include <net/rtnetlink.h>
58 #include <net/net_namespace.h>
59 
60 struct rtnl_link {
61 	rtnl_doit_func		doit;
62 	rtnl_dumpit_func	dumpit;
63 	rtnl_calcit_func 	calcit;
64 };
65 
66 static DEFINE_MUTEX(rtnl_mutex);
67 
68 void rtnl_lock(void)
69 {
70 	mutex_lock(&rtnl_mutex);
71 }
72 EXPORT_SYMBOL(rtnl_lock);
73 
74 static struct sk_buff *defer_kfree_skb_list;
75 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
76 {
77 	if (head && tail) {
78 		tail->next = defer_kfree_skb_list;
79 		defer_kfree_skb_list = head;
80 	}
81 }
82 EXPORT_SYMBOL(rtnl_kfree_skbs);
83 
84 void __rtnl_unlock(void)
85 {
86 	struct sk_buff *head = defer_kfree_skb_list;
87 
88 	defer_kfree_skb_list = NULL;
89 
90 	mutex_unlock(&rtnl_mutex);
91 
92 	while (head) {
93 		struct sk_buff *next = head->next;
94 
95 		kfree_skb(head);
96 		cond_resched();
97 		head = next;
98 	}
99 }
100 
101 void rtnl_unlock(void)
102 {
103 	/* This fellow will unlock it for us. */
104 	netdev_run_todo();
105 }
106 EXPORT_SYMBOL(rtnl_unlock);
107 
108 int rtnl_trylock(void)
109 {
110 	return mutex_trylock(&rtnl_mutex);
111 }
112 EXPORT_SYMBOL(rtnl_trylock);
113 
114 int rtnl_is_locked(void)
115 {
116 	return mutex_is_locked(&rtnl_mutex);
117 }
118 EXPORT_SYMBOL(rtnl_is_locked);
119 
120 #ifdef CONFIG_PROVE_LOCKING
121 bool lockdep_rtnl_is_held(void)
122 {
123 	return lockdep_is_held(&rtnl_mutex);
124 }
125 EXPORT_SYMBOL(lockdep_rtnl_is_held);
126 #endif /* #ifdef CONFIG_PROVE_LOCKING */
127 
128 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
129 
130 static inline int rtm_msgindex(int msgtype)
131 {
132 	int msgindex = msgtype - RTM_BASE;
133 
134 	/*
135 	 * msgindex < 0 implies someone tried to register a netlink
136 	 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
137 	 * the message type has not been added to linux/rtnetlink.h
138 	 */
139 	BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
140 
141 	return msgindex;
142 }
143 
144 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
145 {
146 	struct rtnl_link *tab;
147 
148 	if (protocol <= RTNL_FAMILY_MAX)
149 		tab = rtnl_msg_handlers[protocol];
150 	else
151 		tab = NULL;
152 
153 	if (tab == NULL || tab[msgindex].doit == NULL)
154 		tab = rtnl_msg_handlers[PF_UNSPEC];
155 
156 	return tab[msgindex].doit;
157 }
158 
159 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
160 {
161 	struct rtnl_link *tab;
162 
163 	if (protocol <= RTNL_FAMILY_MAX)
164 		tab = rtnl_msg_handlers[protocol];
165 	else
166 		tab = NULL;
167 
168 	if (tab == NULL || tab[msgindex].dumpit == NULL)
169 		tab = rtnl_msg_handlers[PF_UNSPEC];
170 
171 	return tab[msgindex].dumpit;
172 }
173 
174 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
175 {
176 	struct rtnl_link *tab;
177 
178 	if (protocol <= RTNL_FAMILY_MAX)
179 		tab = rtnl_msg_handlers[protocol];
180 	else
181 		tab = NULL;
182 
183 	if (tab == NULL || tab[msgindex].calcit == NULL)
184 		tab = rtnl_msg_handlers[PF_UNSPEC];
185 
186 	return tab[msgindex].calcit;
187 }
188 
189 /**
190  * __rtnl_register - Register a rtnetlink message type
191  * @protocol: Protocol family or PF_UNSPEC
192  * @msgtype: rtnetlink message type
193  * @doit: Function pointer called for each request message
194  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
195  * @calcit: Function pointer to calc size of dump message
196  *
197  * Registers the specified function pointers (at least one of them has
198  * to be non-NULL) to be called whenever a request message for the
199  * specified protocol family and message type is received.
200  *
201  * The special protocol family PF_UNSPEC may be used to define fallback
202  * function pointers for the case when no entry for the specific protocol
203  * family exists.
204  *
205  * Returns 0 on success or a negative error code.
206  */
207 int __rtnl_register(int protocol, int msgtype,
208 		    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
209 		    rtnl_calcit_func calcit)
210 {
211 	struct rtnl_link *tab;
212 	int msgindex;
213 
214 	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
215 	msgindex = rtm_msgindex(msgtype);
216 
217 	tab = rtnl_msg_handlers[protocol];
218 	if (tab == NULL) {
219 		tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
220 		if (tab == NULL)
221 			return -ENOBUFS;
222 
223 		rtnl_msg_handlers[protocol] = tab;
224 	}
225 
226 	if (doit)
227 		tab[msgindex].doit = doit;
228 
229 	if (dumpit)
230 		tab[msgindex].dumpit = dumpit;
231 
232 	if (calcit)
233 		tab[msgindex].calcit = calcit;
234 
235 	return 0;
236 }
237 EXPORT_SYMBOL_GPL(__rtnl_register);
238 
239 /**
240  * rtnl_register - Register a rtnetlink message type
241  *
242  * Identical to __rtnl_register() but panics on failure. This is useful
243  * as failure of this function is very unlikely, it can only happen due
244  * to lack of memory when allocating the chain to store all message
245  * handlers for a protocol. Meant for use in init functions where lack
246  * of memory implies no sense in continuing.
247  */
248 void rtnl_register(int protocol, int msgtype,
249 		   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
250 		   rtnl_calcit_func calcit)
251 {
252 	if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
253 		panic("Unable to register rtnetlink message handler, "
254 		      "protocol = %d, message type = %d\n",
255 		      protocol, msgtype);
256 }
257 EXPORT_SYMBOL_GPL(rtnl_register);
258 
259 /**
260  * rtnl_unregister - Unregister a rtnetlink message type
261  * @protocol: Protocol family or PF_UNSPEC
262  * @msgtype: rtnetlink message type
263  *
264  * Returns 0 on success or a negative error code.
265  */
266 int rtnl_unregister(int protocol, int msgtype)
267 {
268 	int msgindex;
269 
270 	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
271 	msgindex = rtm_msgindex(msgtype);
272 
273 	if (rtnl_msg_handlers[protocol] == NULL)
274 		return -ENOENT;
275 
276 	rtnl_msg_handlers[protocol][msgindex].doit = NULL;
277 	rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
278 	rtnl_msg_handlers[protocol][msgindex].calcit = NULL;
279 
280 	return 0;
281 }
282 EXPORT_SYMBOL_GPL(rtnl_unregister);
283 
284 /**
285  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
286  * @protocol : Protocol family or PF_UNSPEC
287  *
288  * Identical to calling rtnl_unregster() for all registered message types
289  * of a certain protocol family.
290  */
291 void rtnl_unregister_all(int protocol)
292 {
293 	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
294 
295 	kfree(rtnl_msg_handlers[protocol]);
296 	rtnl_msg_handlers[protocol] = NULL;
297 }
298 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
299 
300 static LIST_HEAD(link_ops);
301 
302 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
303 {
304 	const struct rtnl_link_ops *ops;
305 
306 	list_for_each_entry(ops, &link_ops, list) {
307 		if (!strcmp(ops->kind, kind))
308 			return ops;
309 	}
310 	return NULL;
311 }
312 
313 /**
314  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
315  * @ops: struct rtnl_link_ops * to register
316  *
317  * The caller must hold the rtnl_mutex. This function should be used
318  * by drivers that create devices during module initialization. It
319  * must be called before registering the devices.
320  *
321  * Returns 0 on success or a negative error code.
322  */
323 int __rtnl_link_register(struct rtnl_link_ops *ops)
324 {
325 	if (rtnl_link_ops_get(ops->kind))
326 		return -EEXIST;
327 
328 	/* The check for setup is here because if ops
329 	 * does not have that filled up, it is not possible
330 	 * to use the ops for creating device. So do not
331 	 * fill up dellink as well. That disables rtnl_dellink.
332 	 */
333 	if (ops->setup && !ops->dellink)
334 		ops->dellink = unregister_netdevice_queue;
335 
336 	list_add_tail(&ops->list, &link_ops);
337 	return 0;
338 }
339 EXPORT_SYMBOL_GPL(__rtnl_link_register);
340 
341 /**
342  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
343  * @ops: struct rtnl_link_ops * to register
344  *
345  * Returns 0 on success or a negative error code.
346  */
347 int rtnl_link_register(struct rtnl_link_ops *ops)
348 {
349 	int err;
350 
351 	rtnl_lock();
352 	err = __rtnl_link_register(ops);
353 	rtnl_unlock();
354 	return err;
355 }
356 EXPORT_SYMBOL_GPL(rtnl_link_register);
357 
358 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
359 {
360 	struct net_device *dev;
361 	LIST_HEAD(list_kill);
362 
363 	for_each_netdev(net, dev) {
364 		if (dev->rtnl_link_ops == ops)
365 			ops->dellink(dev, &list_kill);
366 	}
367 	unregister_netdevice_many(&list_kill);
368 }
369 
370 /**
371  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
372  * @ops: struct rtnl_link_ops * to unregister
373  *
374  * The caller must hold the rtnl_mutex.
375  */
376 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
377 {
378 	struct net *net;
379 
380 	for_each_net(net) {
381 		__rtnl_kill_links(net, ops);
382 	}
383 	list_del(&ops->list);
384 }
385 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
386 
387 /* Return with the rtnl_lock held when there are no network
388  * devices unregistering in any network namespace.
389  */
390 static void rtnl_lock_unregistering_all(void)
391 {
392 	struct net *net;
393 	bool unregistering;
394 	DEFINE_WAIT_FUNC(wait, woken_wake_function);
395 
396 	add_wait_queue(&netdev_unregistering_wq, &wait);
397 	for (;;) {
398 		unregistering = false;
399 		rtnl_lock();
400 		for_each_net(net) {
401 			if (net->dev_unreg_count > 0) {
402 				unregistering = true;
403 				break;
404 			}
405 		}
406 		if (!unregistering)
407 			break;
408 		__rtnl_unlock();
409 
410 		wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
411 	}
412 	remove_wait_queue(&netdev_unregistering_wq, &wait);
413 }
414 
415 /**
416  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
417  * @ops: struct rtnl_link_ops * to unregister
418  */
419 void rtnl_link_unregister(struct rtnl_link_ops *ops)
420 {
421 	/* Close the race with cleanup_net() */
422 	mutex_lock(&net_mutex);
423 	rtnl_lock_unregistering_all();
424 	__rtnl_link_unregister(ops);
425 	rtnl_unlock();
426 	mutex_unlock(&net_mutex);
427 }
428 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
429 
430 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
431 {
432 	struct net_device *master_dev;
433 	const struct rtnl_link_ops *ops;
434 
435 	master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
436 	if (!master_dev)
437 		return 0;
438 	ops = master_dev->rtnl_link_ops;
439 	if (!ops || !ops->get_slave_size)
440 		return 0;
441 	/* IFLA_INFO_SLAVE_DATA + nested data */
442 	return nla_total_size(sizeof(struct nlattr)) +
443 	       ops->get_slave_size(master_dev, dev);
444 }
445 
446 static size_t rtnl_link_get_size(const struct net_device *dev)
447 {
448 	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
449 	size_t size;
450 
451 	if (!ops)
452 		return 0;
453 
454 	size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
455 	       nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
456 
457 	if (ops->get_size)
458 		/* IFLA_INFO_DATA + nested data */
459 		size += nla_total_size(sizeof(struct nlattr)) +
460 			ops->get_size(dev);
461 
462 	if (ops->get_xstats_size)
463 		/* IFLA_INFO_XSTATS */
464 		size += nla_total_size(ops->get_xstats_size(dev));
465 
466 	size += rtnl_link_get_slave_info_data_size(dev);
467 
468 	return size;
469 }
470 
471 static LIST_HEAD(rtnl_af_ops);
472 
473 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
474 {
475 	const struct rtnl_af_ops *ops;
476 
477 	list_for_each_entry(ops, &rtnl_af_ops, list) {
478 		if (ops->family == family)
479 			return ops;
480 	}
481 
482 	return NULL;
483 }
484 
485 /**
486  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
487  * @ops: struct rtnl_af_ops * to register
488  *
489  * Returns 0 on success or a negative error code.
490  */
491 void rtnl_af_register(struct rtnl_af_ops *ops)
492 {
493 	rtnl_lock();
494 	list_add_tail(&ops->list, &rtnl_af_ops);
495 	rtnl_unlock();
496 }
497 EXPORT_SYMBOL_GPL(rtnl_af_register);
498 
499 /**
500  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
501  * @ops: struct rtnl_af_ops * to unregister
502  *
503  * The caller must hold the rtnl_mutex.
504  */
505 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
506 {
507 	list_del(&ops->list);
508 }
509 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
510 
511 /**
512  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
513  * @ops: struct rtnl_af_ops * to unregister
514  */
515 void rtnl_af_unregister(struct rtnl_af_ops *ops)
516 {
517 	rtnl_lock();
518 	__rtnl_af_unregister(ops);
519 	rtnl_unlock();
520 }
521 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
522 
523 static size_t rtnl_link_get_af_size(const struct net_device *dev,
524 				    u32 ext_filter_mask)
525 {
526 	struct rtnl_af_ops *af_ops;
527 	size_t size;
528 
529 	/* IFLA_AF_SPEC */
530 	size = nla_total_size(sizeof(struct nlattr));
531 
532 	list_for_each_entry(af_ops, &rtnl_af_ops, list) {
533 		if (af_ops->get_link_af_size) {
534 			/* AF_* + nested data */
535 			size += nla_total_size(sizeof(struct nlattr)) +
536 				af_ops->get_link_af_size(dev, ext_filter_mask);
537 		}
538 	}
539 
540 	return size;
541 }
542 
543 static bool rtnl_have_link_slave_info(const struct net_device *dev)
544 {
545 	struct net_device *master_dev;
546 
547 	master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
548 	if (master_dev && master_dev->rtnl_link_ops)
549 		return true;
550 	return false;
551 }
552 
553 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
554 				     const struct net_device *dev)
555 {
556 	struct net_device *master_dev;
557 	const struct rtnl_link_ops *ops;
558 	struct nlattr *slave_data;
559 	int err;
560 
561 	master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
562 	if (!master_dev)
563 		return 0;
564 	ops = master_dev->rtnl_link_ops;
565 	if (!ops)
566 		return 0;
567 	if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
568 		return -EMSGSIZE;
569 	if (ops->fill_slave_info) {
570 		slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
571 		if (!slave_data)
572 			return -EMSGSIZE;
573 		err = ops->fill_slave_info(skb, master_dev, dev);
574 		if (err < 0)
575 			goto err_cancel_slave_data;
576 		nla_nest_end(skb, slave_data);
577 	}
578 	return 0;
579 
580 err_cancel_slave_data:
581 	nla_nest_cancel(skb, slave_data);
582 	return err;
583 }
584 
585 static int rtnl_link_info_fill(struct sk_buff *skb,
586 			       const struct net_device *dev)
587 {
588 	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
589 	struct nlattr *data;
590 	int err;
591 
592 	if (!ops)
593 		return 0;
594 	if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
595 		return -EMSGSIZE;
596 	if (ops->fill_xstats) {
597 		err = ops->fill_xstats(skb, dev);
598 		if (err < 0)
599 			return err;
600 	}
601 	if (ops->fill_info) {
602 		data = nla_nest_start(skb, IFLA_INFO_DATA);
603 		if (data == NULL)
604 			return -EMSGSIZE;
605 		err = ops->fill_info(skb, dev);
606 		if (err < 0)
607 			goto err_cancel_data;
608 		nla_nest_end(skb, data);
609 	}
610 	return 0;
611 
612 err_cancel_data:
613 	nla_nest_cancel(skb, data);
614 	return err;
615 }
616 
617 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
618 {
619 	struct nlattr *linkinfo;
620 	int err = -EMSGSIZE;
621 
622 	linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
623 	if (linkinfo == NULL)
624 		goto out;
625 
626 	err = rtnl_link_info_fill(skb, dev);
627 	if (err < 0)
628 		goto err_cancel_link;
629 
630 	err = rtnl_link_slave_info_fill(skb, dev);
631 	if (err < 0)
632 		goto err_cancel_link;
633 
634 	nla_nest_end(skb, linkinfo);
635 	return 0;
636 
637 err_cancel_link:
638 	nla_nest_cancel(skb, linkinfo);
639 out:
640 	return err;
641 }
642 
643 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
644 {
645 	struct sock *rtnl = net->rtnl;
646 	int err = 0;
647 
648 	NETLINK_CB(skb).dst_group = group;
649 	if (echo)
650 		atomic_inc(&skb->users);
651 	netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
652 	if (echo)
653 		err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
654 	return err;
655 }
656 
657 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
658 {
659 	struct sock *rtnl = net->rtnl;
660 
661 	return nlmsg_unicast(rtnl, skb, pid);
662 }
663 EXPORT_SYMBOL(rtnl_unicast);
664 
665 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
666 		 struct nlmsghdr *nlh, gfp_t flags)
667 {
668 	struct sock *rtnl = net->rtnl;
669 	int report = 0;
670 
671 	if (nlh)
672 		report = nlmsg_report(nlh);
673 
674 	nlmsg_notify(rtnl, skb, pid, group, report, flags);
675 }
676 EXPORT_SYMBOL(rtnl_notify);
677 
678 void rtnl_set_sk_err(struct net *net, u32 group, int error)
679 {
680 	struct sock *rtnl = net->rtnl;
681 
682 	netlink_set_err(rtnl, 0, group, error);
683 }
684 EXPORT_SYMBOL(rtnl_set_sk_err);
685 
686 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
687 {
688 	struct nlattr *mx;
689 	int i, valid = 0;
690 
691 	mx = nla_nest_start(skb, RTA_METRICS);
692 	if (mx == NULL)
693 		return -ENOBUFS;
694 
695 	for (i = 0; i < RTAX_MAX; i++) {
696 		if (metrics[i]) {
697 			if (i == RTAX_CC_ALGO - 1) {
698 				char tmp[TCP_CA_NAME_MAX], *name;
699 
700 				name = tcp_ca_get_name_by_key(metrics[i], tmp);
701 				if (!name)
702 					continue;
703 				if (nla_put_string(skb, i + 1, name))
704 					goto nla_put_failure;
705 			} else if (i == RTAX_FEATURES - 1) {
706 				u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
707 
708 				if (!user_features)
709 					continue;
710 				BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
711 				if (nla_put_u32(skb, i + 1, user_features))
712 					goto nla_put_failure;
713 			} else {
714 				if (nla_put_u32(skb, i + 1, metrics[i]))
715 					goto nla_put_failure;
716 			}
717 			valid++;
718 		}
719 	}
720 
721 	if (!valid) {
722 		nla_nest_cancel(skb, mx);
723 		return 0;
724 	}
725 
726 	return nla_nest_end(skb, mx);
727 
728 nla_put_failure:
729 	nla_nest_cancel(skb, mx);
730 	return -EMSGSIZE;
731 }
732 EXPORT_SYMBOL(rtnetlink_put_metrics);
733 
734 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
735 		       long expires, u32 error)
736 {
737 	struct rta_cacheinfo ci = {
738 		.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
739 		.rta_used = dst->__use,
740 		.rta_clntref = atomic_read(&(dst->__refcnt)),
741 		.rta_error = error,
742 		.rta_id =  id,
743 	};
744 
745 	if (expires) {
746 		unsigned long clock;
747 
748 		clock = jiffies_to_clock_t(abs(expires));
749 		clock = min_t(unsigned long, clock, INT_MAX);
750 		ci.rta_expires = (expires > 0) ? clock : -clock;
751 	}
752 	return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
753 }
754 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
755 
756 static void set_operstate(struct net_device *dev, unsigned char transition)
757 {
758 	unsigned char operstate = dev->operstate;
759 
760 	switch (transition) {
761 	case IF_OPER_UP:
762 		if ((operstate == IF_OPER_DORMANT ||
763 		     operstate == IF_OPER_UNKNOWN) &&
764 		    !netif_dormant(dev))
765 			operstate = IF_OPER_UP;
766 		break;
767 
768 	case IF_OPER_DORMANT:
769 		if (operstate == IF_OPER_UP ||
770 		    operstate == IF_OPER_UNKNOWN)
771 			operstate = IF_OPER_DORMANT;
772 		break;
773 	}
774 
775 	if (dev->operstate != operstate) {
776 		write_lock_bh(&dev_base_lock);
777 		dev->operstate = operstate;
778 		write_unlock_bh(&dev_base_lock);
779 		netdev_state_change(dev);
780 	}
781 }
782 
783 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
784 {
785 	return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
786 	       (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
787 }
788 
789 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
790 					   const struct ifinfomsg *ifm)
791 {
792 	unsigned int flags = ifm->ifi_flags;
793 
794 	/* bugwards compatibility: ifi_change == 0 is treated as ~0 */
795 	if (ifm->ifi_change)
796 		flags = (flags & ifm->ifi_change) |
797 			(rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
798 
799 	return flags;
800 }
801 
802 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
803 				 const struct rtnl_link_stats64 *b)
804 {
805 	a->rx_packets = b->rx_packets;
806 	a->tx_packets = b->tx_packets;
807 	a->rx_bytes = b->rx_bytes;
808 	a->tx_bytes = b->tx_bytes;
809 	a->rx_errors = b->rx_errors;
810 	a->tx_errors = b->tx_errors;
811 	a->rx_dropped = b->rx_dropped;
812 	a->tx_dropped = b->tx_dropped;
813 
814 	a->multicast = b->multicast;
815 	a->collisions = b->collisions;
816 
817 	a->rx_length_errors = b->rx_length_errors;
818 	a->rx_over_errors = b->rx_over_errors;
819 	a->rx_crc_errors = b->rx_crc_errors;
820 	a->rx_frame_errors = b->rx_frame_errors;
821 	a->rx_fifo_errors = b->rx_fifo_errors;
822 	a->rx_missed_errors = b->rx_missed_errors;
823 
824 	a->tx_aborted_errors = b->tx_aborted_errors;
825 	a->tx_carrier_errors = b->tx_carrier_errors;
826 	a->tx_fifo_errors = b->tx_fifo_errors;
827 	a->tx_heartbeat_errors = b->tx_heartbeat_errors;
828 	a->tx_window_errors = b->tx_window_errors;
829 
830 	a->rx_compressed = b->rx_compressed;
831 	a->tx_compressed = b->tx_compressed;
832 
833 	a->rx_nohandler = b->rx_nohandler;
834 }
835 
836 /* All VF info */
837 static inline int rtnl_vfinfo_size(const struct net_device *dev,
838 				   u32 ext_filter_mask)
839 {
840 	if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
841 	    (ext_filter_mask & RTEXT_FILTER_VF)) {
842 		int num_vfs = dev_num_vf(dev->dev.parent);
843 		size_t size = nla_total_size(0);
844 		size += num_vfs *
845 			(nla_total_size(0) +
846 			 nla_total_size(sizeof(struct ifla_vf_mac)) +
847 			 nla_total_size(sizeof(struct ifla_vf_vlan)) +
848 			 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
849 			 nla_total_size(MAX_VLAN_LIST_LEN *
850 					sizeof(struct ifla_vf_vlan_info)) +
851 			 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
852 			 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
853 			 nla_total_size(sizeof(struct ifla_vf_rate)) +
854 			 nla_total_size(sizeof(struct ifla_vf_link_state)) +
855 			 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
856 			 nla_total_size(0) + /* nest IFLA_VF_STATS */
857 			 /* IFLA_VF_STATS_RX_PACKETS */
858 			 nla_total_size_64bit(sizeof(__u64)) +
859 			 /* IFLA_VF_STATS_TX_PACKETS */
860 			 nla_total_size_64bit(sizeof(__u64)) +
861 			 /* IFLA_VF_STATS_RX_BYTES */
862 			 nla_total_size_64bit(sizeof(__u64)) +
863 			 /* IFLA_VF_STATS_TX_BYTES */
864 			 nla_total_size_64bit(sizeof(__u64)) +
865 			 /* IFLA_VF_STATS_BROADCAST */
866 			 nla_total_size_64bit(sizeof(__u64)) +
867 			 /* IFLA_VF_STATS_MULTICAST */
868 			 nla_total_size_64bit(sizeof(__u64)) +
869 			 nla_total_size(sizeof(struct ifla_vf_trust)));
870 		return size;
871 	} else
872 		return 0;
873 }
874 
875 static size_t rtnl_port_size(const struct net_device *dev,
876 			     u32 ext_filter_mask)
877 {
878 	size_t port_size = nla_total_size(4)		/* PORT_VF */
879 		+ nla_total_size(PORT_PROFILE_MAX)	/* PORT_PROFILE */
880 		+ nla_total_size(sizeof(struct ifla_port_vsi))
881 							/* PORT_VSI_TYPE */
882 		+ nla_total_size(PORT_UUID_MAX)		/* PORT_INSTANCE_UUID */
883 		+ nla_total_size(PORT_UUID_MAX)		/* PORT_HOST_UUID */
884 		+ nla_total_size(1)			/* PROT_VDP_REQUEST */
885 		+ nla_total_size(2);			/* PORT_VDP_RESPONSE */
886 	size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
887 	size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
888 		+ port_size;
889 	size_t port_self_size = nla_total_size(sizeof(struct nlattr))
890 		+ port_size;
891 
892 	if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
893 	    !(ext_filter_mask & RTEXT_FILTER_VF))
894 		return 0;
895 	if (dev_num_vf(dev->dev.parent))
896 		return port_self_size + vf_ports_size +
897 			vf_port_size * dev_num_vf(dev->dev.parent);
898 	else
899 		return port_self_size;
900 }
901 
902 static size_t rtnl_xdp_size(const struct net_device *dev)
903 {
904 	size_t xdp_size = nla_total_size(0) +	/* nest IFLA_XDP */
905 			  nla_total_size(1);	/* XDP_ATTACHED */
906 
907 	if (!dev->netdev_ops->ndo_xdp)
908 		return 0;
909 	else
910 		return xdp_size;
911 }
912 
913 static noinline size_t if_nlmsg_size(const struct net_device *dev,
914 				     u32 ext_filter_mask)
915 {
916 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
917 	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
918 	       + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
919 	       + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
920 	       + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
921 	       + nla_total_size(sizeof(struct rtnl_link_stats))
922 	       + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
923 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
924 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
925 	       + nla_total_size(4) /* IFLA_TXQLEN */
926 	       + nla_total_size(4) /* IFLA_WEIGHT */
927 	       + nla_total_size(4) /* IFLA_MTU */
928 	       + nla_total_size(4) /* IFLA_LINK */
929 	       + nla_total_size(4) /* IFLA_MASTER */
930 	       + nla_total_size(1) /* IFLA_CARRIER */
931 	       + nla_total_size(4) /* IFLA_PROMISCUITY */
932 	       + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
933 	       + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
934 	       + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
935 	       + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
936 	       + nla_total_size(1) /* IFLA_OPERSTATE */
937 	       + nla_total_size(1) /* IFLA_LINKMODE */
938 	       + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
939 	       + nla_total_size(4) /* IFLA_LINK_NETNSID */
940 	       + nla_total_size(ext_filter_mask
941 			        & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
942 	       + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
943 	       + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
944 	       + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
945 	       + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
946 	       + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
947 	       + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
948 	       + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
949 	       + rtnl_xdp_size(dev) /* IFLA_XDP */
950 	       + nla_total_size(1); /* IFLA_PROTO_DOWN */
951 
952 }
953 
954 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
955 {
956 	struct nlattr *vf_ports;
957 	struct nlattr *vf_port;
958 	int vf;
959 	int err;
960 
961 	vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
962 	if (!vf_ports)
963 		return -EMSGSIZE;
964 
965 	for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
966 		vf_port = nla_nest_start(skb, IFLA_VF_PORT);
967 		if (!vf_port)
968 			goto nla_put_failure;
969 		if (nla_put_u32(skb, IFLA_PORT_VF, vf))
970 			goto nla_put_failure;
971 		err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
972 		if (err == -EMSGSIZE)
973 			goto nla_put_failure;
974 		if (err) {
975 			nla_nest_cancel(skb, vf_port);
976 			continue;
977 		}
978 		nla_nest_end(skb, vf_port);
979 	}
980 
981 	nla_nest_end(skb, vf_ports);
982 
983 	return 0;
984 
985 nla_put_failure:
986 	nla_nest_cancel(skb, vf_ports);
987 	return -EMSGSIZE;
988 }
989 
990 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
991 {
992 	struct nlattr *port_self;
993 	int err;
994 
995 	port_self = nla_nest_start(skb, IFLA_PORT_SELF);
996 	if (!port_self)
997 		return -EMSGSIZE;
998 
999 	err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1000 	if (err) {
1001 		nla_nest_cancel(skb, port_self);
1002 		return (err == -EMSGSIZE) ? err : 0;
1003 	}
1004 
1005 	nla_nest_end(skb, port_self);
1006 
1007 	return 0;
1008 }
1009 
1010 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1011 			  u32 ext_filter_mask)
1012 {
1013 	int err;
1014 
1015 	if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1016 	    !(ext_filter_mask & RTEXT_FILTER_VF))
1017 		return 0;
1018 
1019 	err = rtnl_port_self_fill(skb, dev);
1020 	if (err)
1021 		return err;
1022 
1023 	if (dev_num_vf(dev->dev.parent)) {
1024 		err = rtnl_vf_ports_fill(skb, dev);
1025 		if (err)
1026 			return err;
1027 	}
1028 
1029 	return 0;
1030 }
1031 
1032 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1033 {
1034 	int err;
1035 	struct netdev_phys_item_id ppid;
1036 
1037 	err = dev_get_phys_port_id(dev, &ppid);
1038 	if (err) {
1039 		if (err == -EOPNOTSUPP)
1040 			return 0;
1041 		return err;
1042 	}
1043 
1044 	if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1045 		return -EMSGSIZE;
1046 
1047 	return 0;
1048 }
1049 
1050 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1051 {
1052 	char name[IFNAMSIZ];
1053 	int err;
1054 
1055 	err = dev_get_phys_port_name(dev, name, sizeof(name));
1056 	if (err) {
1057 		if (err == -EOPNOTSUPP)
1058 			return 0;
1059 		return err;
1060 	}
1061 
1062 	if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
1063 		return -EMSGSIZE;
1064 
1065 	return 0;
1066 }
1067 
1068 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1069 {
1070 	int err;
1071 	struct switchdev_attr attr = {
1072 		.orig_dev = dev,
1073 		.id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1074 		.flags = SWITCHDEV_F_NO_RECURSE,
1075 	};
1076 
1077 	err = switchdev_port_attr_get(dev, &attr);
1078 	if (err) {
1079 		if (err == -EOPNOTSUPP)
1080 			return 0;
1081 		return err;
1082 	}
1083 
1084 	if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1085 		    attr.u.ppid.id))
1086 		return -EMSGSIZE;
1087 
1088 	return 0;
1089 }
1090 
1091 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1092 					      struct net_device *dev)
1093 {
1094 	struct rtnl_link_stats64 *sp;
1095 	struct nlattr *attr;
1096 
1097 	attr = nla_reserve_64bit(skb, IFLA_STATS64,
1098 				 sizeof(struct rtnl_link_stats64), IFLA_PAD);
1099 	if (!attr)
1100 		return -EMSGSIZE;
1101 
1102 	sp = nla_data(attr);
1103 	dev_get_stats(dev, sp);
1104 
1105 	attr = nla_reserve(skb, IFLA_STATS,
1106 			   sizeof(struct rtnl_link_stats));
1107 	if (!attr)
1108 		return -EMSGSIZE;
1109 
1110 	copy_rtnl_link_stats(nla_data(attr), sp);
1111 
1112 	return 0;
1113 }
1114 
1115 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1116 					       struct net_device *dev,
1117 					       int vfs_num,
1118 					       struct nlattr *vfinfo)
1119 {
1120 	struct ifla_vf_rss_query_en vf_rss_query_en;
1121 	struct nlattr *vf, *vfstats, *vfvlanlist;
1122 	struct ifla_vf_link_state vf_linkstate;
1123 	struct ifla_vf_vlan_info vf_vlan_info;
1124 	struct ifla_vf_spoofchk vf_spoofchk;
1125 	struct ifla_vf_tx_rate vf_tx_rate;
1126 	struct ifla_vf_stats vf_stats;
1127 	struct ifla_vf_trust vf_trust;
1128 	struct ifla_vf_vlan vf_vlan;
1129 	struct ifla_vf_rate vf_rate;
1130 	struct ifla_vf_mac vf_mac;
1131 	struct ifla_vf_info ivi;
1132 
1133 	/* Not all SR-IOV capable drivers support the
1134 	 * spoofcheck and "RSS query enable" query.  Preset to
1135 	 * -1 so the user space tool can detect that the driver
1136 	 * didn't report anything.
1137 	 */
1138 	ivi.spoofchk = -1;
1139 	ivi.rss_query_en = -1;
1140 	ivi.trusted = -1;
1141 	memset(ivi.mac, 0, sizeof(ivi.mac));
1142 	/* The default value for VF link state is "auto"
1143 	 * IFLA_VF_LINK_STATE_AUTO which equals zero
1144 	 */
1145 	ivi.linkstate = 0;
1146 	/* VLAN Protocol by default is 802.1Q */
1147 	ivi.vlan_proto = htons(ETH_P_8021Q);
1148 	if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1149 		return 0;
1150 
1151 	memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1152 
1153 	vf_mac.vf =
1154 		vf_vlan.vf =
1155 		vf_vlan_info.vf =
1156 		vf_rate.vf =
1157 		vf_tx_rate.vf =
1158 		vf_spoofchk.vf =
1159 		vf_linkstate.vf =
1160 		vf_rss_query_en.vf =
1161 		vf_trust.vf = ivi.vf;
1162 
1163 	memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1164 	vf_vlan.vlan = ivi.vlan;
1165 	vf_vlan.qos = ivi.qos;
1166 	vf_vlan_info.vlan = ivi.vlan;
1167 	vf_vlan_info.qos = ivi.qos;
1168 	vf_vlan_info.vlan_proto = ivi.vlan_proto;
1169 	vf_tx_rate.rate = ivi.max_tx_rate;
1170 	vf_rate.min_tx_rate = ivi.min_tx_rate;
1171 	vf_rate.max_tx_rate = ivi.max_tx_rate;
1172 	vf_spoofchk.setting = ivi.spoofchk;
1173 	vf_linkstate.link_state = ivi.linkstate;
1174 	vf_rss_query_en.setting = ivi.rss_query_en;
1175 	vf_trust.setting = ivi.trusted;
1176 	vf = nla_nest_start(skb, IFLA_VF_INFO);
1177 	if (!vf)
1178 		goto nla_put_vfinfo_failure;
1179 	if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1180 	    nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1181 	    nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1182 		    &vf_rate) ||
1183 	    nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1184 		    &vf_tx_rate) ||
1185 	    nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1186 		    &vf_spoofchk) ||
1187 	    nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1188 		    &vf_linkstate) ||
1189 	    nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1190 		    sizeof(vf_rss_query_en),
1191 		    &vf_rss_query_en) ||
1192 	    nla_put(skb, IFLA_VF_TRUST,
1193 		    sizeof(vf_trust), &vf_trust))
1194 		goto nla_put_vf_failure;
1195 	vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST);
1196 	if (!vfvlanlist)
1197 		goto nla_put_vf_failure;
1198 	if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1199 		    &vf_vlan_info)) {
1200 		nla_nest_cancel(skb, vfvlanlist);
1201 		goto nla_put_vf_failure;
1202 	}
1203 	nla_nest_end(skb, vfvlanlist);
1204 	memset(&vf_stats, 0, sizeof(vf_stats));
1205 	if (dev->netdev_ops->ndo_get_vf_stats)
1206 		dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1207 						&vf_stats);
1208 	vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1209 	if (!vfstats)
1210 		goto nla_put_vf_failure;
1211 	if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1212 			      vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1213 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1214 			      vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1215 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1216 			      vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1217 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1218 			      vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1219 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1220 			      vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1221 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1222 			      vf_stats.multicast, IFLA_VF_STATS_PAD)) {
1223 		nla_nest_cancel(skb, vfstats);
1224 		goto nla_put_vf_failure;
1225 	}
1226 	nla_nest_end(skb, vfstats);
1227 	nla_nest_end(skb, vf);
1228 	return 0;
1229 
1230 nla_put_vf_failure:
1231 	nla_nest_cancel(skb, vf);
1232 nla_put_vfinfo_failure:
1233 	nla_nest_cancel(skb, vfinfo);
1234 	return -EMSGSIZE;
1235 }
1236 
1237 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1238 {
1239 	struct rtnl_link_ifmap map;
1240 
1241 	memset(&map, 0, sizeof(map));
1242 	map.mem_start   = dev->mem_start;
1243 	map.mem_end     = dev->mem_end;
1244 	map.base_addr   = dev->base_addr;
1245 	map.irq         = dev->irq;
1246 	map.dma         = dev->dma;
1247 	map.port        = dev->if_port;
1248 
1249 	if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1250 		return -EMSGSIZE;
1251 
1252 	return 0;
1253 }
1254 
1255 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1256 {
1257 	struct netdev_xdp xdp_op = {};
1258 	struct nlattr *xdp;
1259 	int err;
1260 
1261 	if (!dev->netdev_ops->ndo_xdp)
1262 		return 0;
1263 	xdp = nla_nest_start(skb, IFLA_XDP);
1264 	if (!xdp)
1265 		return -EMSGSIZE;
1266 	xdp_op.command = XDP_QUERY_PROG;
1267 	err = dev->netdev_ops->ndo_xdp(dev, &xdp_op);
1268 	if (err)
1269 		goto err_cancel;
1270 	err = nla_put_u8(skb, IFLA_XDP_ATTACHED, xdp_op.prog_attached);
1271 	if (err)
1272 		goto err_cancel;
1273 
1274 	nla_nest_end(skb, xdp);
1275 	return 0;
1276 
1277 err_cancel:
1278 	nla_nest_cancel(skb, xdp);
1279 	return err;
1280 }
1281 
1282 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1283 			    int type, u32 pid, u32 seq, u32 change,
1284 			    unsigned int flags, u32 ext_filter_mask)
1285 {
1286 	struct ifinfomsg *ifm;
1287 	struct nlmsghdr *nlh;
1288 	struct nlattr *af_spec;
1289 	struct rtnl_af_ops *af_ops;
1290 	struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1291 
1292 	ASSERT_RTNL();
1293 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1294 	if (nlh == NULL)
1295 		return -EMSGSIZE;
1296 
1297 	ifm = nlmsg_data(nlh);
1298 	ifm->ifi_family = AF_UNSPEC;
1299 	ifm->__ifi_pad = 0;
1300 	ifm->ifi_type = dev->type;
1301 	ifm->ifi_index = dev->ifindex;
1302 	ifm->ifi_flags = dev_get_flags(dev);
1303 	ifm->ifi_change = change;
1304 
1305 	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1306 	    nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1307 	    nla_put_u8(skb, IFLA_OPERSTATE,
1308 		       netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1309 	    nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1310 	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1311 	    nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1312 	    nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1313 	    nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1314 	    nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1315 	    nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1316 #ifdef CONFIG_RPS
1317 	    nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1318 #endif
1319 	    (dev->ifindex != dev_get_iflink(dev) &&
1320 	     nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1321 	    (upper_dev &&
1322 	     nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1323 	    nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1324 	    (dev->qdisc &&
1325 	     nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1326 	    (dev->ifalias &&
1327 	     nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1328 	    nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1329 			atomic_read(&dev->carrier_changes)) ||
1330 	    nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1331 		goto nla_put_failure;
1332 
1333 	if (rtnl_fill_link_ifmap(skb, dev))
1334 		goto nla_put_failure;
1335 
1336 	if (dev->addr_len) {
1337 		if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1338 		    nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1339 			goto nla_put_failure;
1340 	}
1341 
1342 	if (rtnl_phys_port_id_fill(skb, dev))
1343 		goto nla_put_failure;
1344 
1345 	if (rtnl_phys_port_name_fill(skb, dev))
1346 		goto nla_put_failure;
1347 
1348 	if (rtnl_phys_switch_id_fill(skb, dev))
1349 		goto nla_put_failure;
1350 
1351 	if (rtnl_fill_stats(skb, dev))
1352 		goto nla_put_failure;
1353 
1354 	if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1355 	    nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1356 		goto nla_put_failure;
1357 
1358 	if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent &&
1359 	    ext_filter_mask & RTEXT_FILTER_VF) {
1360 		int i;
1361 		struct nlattr *vfinfo;
1362 		int num_vfs = dev_num_vf(dev->dev.parent);
1363 
1364 		vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1365 		if (!vfinfo)
1366 			goto nla_put_failure;
1367 		for (i = 0; i < num_vfs; i++) {
1368 			if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1369 				goto nla_put_failure;
1370 		}
1371 
1372 		nla_nest_end(skb, vfinfo);
1373 	}
1374 
1375 	if (rtnl_port_fill(skb, dev, ext_filter_mask))
1376 		goto nla_put_failure;
1377 
1378 	if (rtnl_xdp_fill(skb, dev))
1379 		goto nla_put_failure;
1380 
1381 	if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1382 		if (rtnl_link_fill(skb, dev) < 0)
1383 			goto nla_put_failure;
1384 	}
1385 
1386 	if (dev->rtnl_link_ops &&
1387 	    dev->rtnl_link_ops->get_link_net) {
1388 		struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1389 
1390 		if (!net_eq(dev_net(dev), link_net)) {
1391 			int id = peernet2id_alloc(dev_net(dev), link_net);
1392 
1393 			if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1394 				goto nla_put_failure;
1395 		}
1396 	}
1397 
1398 	if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1399 		goto nla_put_failure;
1400 
1401 	list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1402 		if (af_ops->fill_link_af) {
1403 			struct nlattr *af;
1404 			int err;
1405 
1406 			if (!(af = nla_nest_start(skb, af_ops->family)))
1407 				goto nla_put_failure;
1408 
1409 			err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1410 
1411 			/*
1412 			 * Caller may return ENODATA to indicate that there
1413 			 * was no data to be dumped. This is not an error, it
1414 			 * means we should trim the attribute header and
1415 			 * continue.
1416 			 */
1417 			if (err == -ENODATA)
1418 				nla_nest_cancel(skb, af);
1419 			else if (err < 0)
1420 				goto nla_put_failure;
1421 
1422 			nla_nest_end(skb, af);
1423 		}
1424 	}
1425 
1426 	nla_nest_end(skb, af_spec);
1427 
1428 	nlmsg_end(skb, nlh);
1429 	return 0;
1430 
1431 nla_put_failure:
1432 	nlmsg_cancel(skb, nlh);
1433 	return -EMSGSIZE;
1434 }
1435 
1436 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1437 	[IFLA_IFNAME]		= { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1438 	[IFLA_ADDRESS]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1439 	[IFLA_BROADCAST]	= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1440 	[IFLA_MAP]		= { .len = sizeof(struct rtnl_link_ifmap) },
1441 	[IFLA_MTU]		= { .type = NLA_U32 },
1442 	[IFLA_LINK]		= { .type = NLA_U32 },
1443 	[IFLA_MASTER]		= { .type = NLA_U32 },
1444 	[IFLA_CARRIER]		= { .type = NLA_U8 },
1445 	[IFLA_TXQLEN]		= { .type = NLA_U32 },
1446 	[IFLA_WEIGHT]		= { .type = NLA_U32 },
1447 	[IFLA_OPERSTATE]	= { .type = NLA_U8 },
1448 	[IFLA_LINKMODE]		= { .type = NLA_U8 },
1449 	[IFLA_LINKINFO]		= { .type = NLA_NESTED },
1450 	[IFLA_NET_NS_PID]	= { .type = NLA_U32 },
1451 	[IFLA_NET_NS_FD]	= { .type = NLA_U32 },
1452 	[IFLA_IFALIAS]	        = { .type = NLA_STRING, .len = IFALIASZ-1 },
1453 	[IFLA_VFINFO_LIST]	= {. type = NLA_NESTED },
1454 	[IFLA_VF_PORTS]		= { .type = NLA_NESTED },
1455 	[IFLA_PORT_SELF]	= { .type = NLA_NESTED },
1456 	[IFLA_AF_SPEC]		= { .type = NLA_NESTED },
1457 	[IFLA_EXT_MASK]		= { .type = NLA_U32 },
1458 	[IFLA_PROMISCUITY]	= { .type = NLA_U32 },
1459 	[IFLA_NUM_TX_QUEUES]	= { .type = NLA_U32 },
1460 	[IFLA_NUM_RX_QUEUES]	= { .type = NLA_U32 },
1461 	[IFLA_PHYS_PORT_ID]	= { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1462 	[IFLA_CARRIER_CHANGES]	= { .type = NLA_U32 },  /* ignored */
1463 	[IFLA_PHYS_SWITCH_ID]	= { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1464 	[IFLA_LINK_NETNSID]	= { .type = NLA_S32 },
1465 	[IFLA_PROTO_DOWN]	= { .type = NLA_U8 },
1466 	[IFLA_XDP]		= { .type = NLA_NESTED },
1467 };
1468 
1469 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1470 	[IFLA_INFO_KIND]	= { .type = NLA_STRING },
1471 	[IFLA_INFO_DATA]	= { .type = NLA_NESTED },
1472 	[IFLA_INFO_SLAVE_KIND]	= { .type = NLA_STRING },
1473 	[IFLA_INFO_SLAVE_DATA]	= { .type = NLA_NESTED },
1474 };
1475 
1476 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1477 	[IFLA_VF_MAC]		= { .len = sizeof(struct ifla_vf_mac) },
1478 	[IFLA_VF_VLAN]		= { .len = sizeof(struct ifla_vf_vlan) },
1479 	[IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1480 	[IFLA_VF_TX_RATE]	= { .len = sizeof(struct ifla_vf_tx_rate) },
1481 	[IFLA_VF_SPOOFCHK]	= { .len = sizeof(struct ifla_vf_spoofchk) },
1482 	[IFLA_VF_RATE]		= { .len = sizeof(struct ifla_vf_rate) },
1483 	[IFLA_VF_LINK_STATE]	= { .len = sizeof(struct ifla_vf_link_state) },
1484 	[IFLA_VF_RSS_QUERY_EN]	= { .len = sizeof(struct ifla_vf_rss_query_en) },
1485 	[IFLA_VF_STATS]		= { .type = NLA_NESTED },
1486 	[IFLA_VF_TRUST]		= { .len = sizeof(struct ifla_vf_trust) },
1487 	[IFLA_VF_IB_NODE_GUID]	= { .len = sizeof(struct ifla_vf_guid) },
1488 	[IFLA_VF_IB_PORT_GUID]	= { .len = sizeof(struct ifla_vf_guid) },
1489 };
1490 
1491 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1492 	[IFLA_PORT_VF]		= { .type = NLA_U32 },
1493 	[IFLA_PORT_PROFILE]	= { .type = NLA_STRING,
1494 				    .len = PORT_PROFILE_MAX },
1495 	[IFLA_PORT_VSI_TYPE]	= { .type = NLA_BINARY,
1496 				    .len = sizeof(struct ifla_port_vsi)},
1497 	[IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1498 				      .len = PORT_UUID_MAX },
1499 	[IFLA_PORT_HOST_UUID]	= { .type = NLA_STRING,
1500 				    .len = PORT_UUID_MAX },
1501 	[IFLA_PORT_REQUEST]	= { .type = NLA_U8, },
1502 	[IFLA_PORT_RESPONSE]	= { .type = NLA_U16, },
1503 };
1504 
1505 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1506 	[IFLA_XDP_FD]		= { .type = NLA_S32 },
1507 	[IFLA_XDP_ATTACHED]	= { .type = NLA_U8 },
1508 };
1509 
1510 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1511 {
1512 	const struct rtnl_link_ops *ops = NULL;
1513 	struct nlattr *linfo[IFLA_INFO_MAX + 1];
1514 
1515 	if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla, ifla_info_policy) < 0)
1516 		return NULL;
1517 
1518 	if (linfo[IFLA_INFO_KIND]) {
1519 		char kind[MODULE_NAME_LEN];
1520 
1521 		nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1522 		ops = rtnl_link_ops_get(kind);
1523 	}
1524 
1525 	return ops;
1526 }
1527 
1528 static bool link_master_filtered(struct net_device *dev, int master_idx)
1529 {
1530 	struct net_device *master;
1531 
1532 	if (!master_idx)
1533 		return false;
1534 
1535 	master = netdev_master_upper_dev_get(dev);
1536 	if (!master || master->ifindex != master_idx)
1537 		return true;
1538 
1539 	return false;
1540 }
1541 
1542 static bool link_kind_filtered(const struct net_device *dev,
1543 			       const struct rtnl_link_ops *kind_ops)
1544 {
1545 	if (kind_ops && dev->rtnl_link_ops != kind_ops)
1546 		return true;
1547 
1548 	return false;
1549 }
1550 
1551 static bool link_dump_filtered(struct net_device *dev,
1552 			       int master_idx,
1553 			       const struct rtnl_link_ops *kind_ops)
1554 {
1555 	if (link_master_filtered(dev, master_idx) ||
1556 	    link_kind_filtered(dev, kind_ops))
1557 		return true;
1558 
1559 	return false;
1560 }
1561 
1562 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1563 {
1564 	struct net *net = sock_net(skb->sk);
1565 	int h, s_h;
1566 	int idx = 0, s_idx;
1567 	struct net_device *dev;
1568 	struct hlist_head *head;
1569 	struct nlattr *tb[IFLA_MAX+1];
1570 	u32 ext_filter_mask = 0;
1571 	const struct rtnl_link_ops *kind_ops = NULL;
1572 	unsigned int flags = NLM_F_MULTI;
1573 	int master_idx = 0;
1574 	int err;
1575 	int hdrlen;
1576 
1577 	s_h = cb->args[0];
1578 	s_idx = cb->args[1];
1579 
1580 	cb->seq = net->dev_base_seq;
1581 
1582 	/* A hack to preserve kernel<->userspace interface.
1583 	 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1584 	 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1585 	 * what iproute2 < v3.9.0 used.
1586 	 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1587 	 * attribute, its netlink message is shorter than struct ifinfomsg.
1588 	 */
1589 	hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1590 		 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1591 
1592 	if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1593 
1594 		if (tb[IFLA_EXT_MASK])
1595 			ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1596 
1597 		if (tb[IFLA_MASTER])
1598 			master_idx = nla_get_u32(tb[IFLA_MASTER]);
1599 
1600 		if (tb[IFLA_LINKINFO])
1601 			kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1602 
1603 		if (master_idx || kind_ops)
1604 			flags |= NLM_F_DUMP_FILTERED;
1605 	}
1606 
1607 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1608 		idx = 0;
1609 		head = &net->dev_index_head[h];
1610 		hlist_for_each_entry(dev, head, index_hlist) {
1611 			if (link_dump_filtered(dev, master_idx, kind_ops))
1612 				goto cont;
1613 			if (idx < s_idx)
1614 				goto cont;
1615 			err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1616 					       NETLINK_CB(cb->skb).portid,
1617 					       cb->nlh->nlmsg_seq, 0,
1618 					       flags,
1619 					       ext_filter_mask);
1620 			/* If we ran out of room on the first message,
1621 			 * we're in trouble
1622 			 */
1623 			WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1624 
1625 			if (err < 0)
1626 				goto out;
1627 
1628 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1629 cont:
1630 			idx++;
1631 		}
1632 	}
1633 out:
1634 	cb->args[1] = idx;
1635 	cb->args[0] = h;
1636 
1637 	return skb->len;
1638 }
1639 
1640 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1641 {
1642 	return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1643 }
1644 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1645 
1646 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1647 {
1648 	struct net *net;
1649 	/* Examine the link attributes and figure out which
1650 	 * network namespace we are talking about.
1651 	 */
1652 	if (tb[IFLA_NET_NS_PID])
1653 		net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1654 	else if (tb[IFLA_NET_NS_FD])
1655 		net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1656 	else
1657 		net = get_net(src_net);
1658 	return net;
1659 }
1660 EXPORT_SYMBOL(rtnl_link_get_net);
1661 
1662 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1663 {
1664 	if (dev) {
1665 		if (tb[IFLA_ADDRESS] &&
1666 		    nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1667 			return -EINVAL;
1668 
1669 		if (tb[IFLA_BROADCAST] &&
1670 		    nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1671 			return -EINVAL;
1672 	}
1673 
1674 	if (tb[IFLA_AF_SPEC]) {
1675 		struct nlattr *af;
1676 		int rem, err;
1677 
1678 		nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1679 			const struct rtnl_af_ops *af_ops;
1680 
1681 			if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1682 				return -EAFNOSUPPORT;
1683 
1684 			if (!af_ops->set_link_af)
1685 				return -EOPNOTSUPP;
1686 
1687 			if (af_ops->validate_link_af) {
1688 				err = af_ops->validate_link_af(dev, af);
1689 				if (err < 0)
1690 					return err;
1691 			}
1692 		}
1693 	}
1694 
1695 	return 0;
1696 }
1697 
1698 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
1699 				  int guid_type)
1700 {
1701 	const struct net_device_ops *ops = dev->netdev_ops;
1702 
1703 	return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
1704 }
1705 
1706 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
1707 {
1708 	if (dev->type != ARPHRD_INFINIBAND)
1709 		return -EOPNOTSUPP;
1710 
1711 	return handle_infiniband_guid(dev, ivt, guid_type);
1712 }
1713 
1714 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1715 {
1716 	const struct net_device_ops *ops = dev->netdev_ops;
1717 	int err = -EINVAL;
1718 
1719 	if (tb[IFLA_VF_MAC]) {
1720 		struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1721 
1722 		err = -EOPNOTSUPP;
1723 		if (ops->ndo_set_vf_mac)
1724 			err = ops->ndo_set_vf_mac(dev, ivm->vf,
1725 						  ivm->mac);
1726 		if (err < 0)
1727 			return err;
1728 	}
1729 
1730 	if (tb[IFLA_VF_VLAN]) {
1731 		struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1732 
1733 		err = -EOPNOTSUPP;
1734 		if (ops->ndo_set_vf_vlan)
1735 			err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1736 						   ivv->qos,
1737 						   htons(ETH_P_8021Q));
1738 		if (err < 0)
1739 			return err;
1740 	}
1741 
1742 	if (tb[IFLA_VF_VLAN_LIST]) {
1743 		struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
1744 		struct nlattr *attr;
1745 		int rem, len = 0;
1746 
1747 		err = -EOPNOTSUPP;
1748 		if (!ops->ndo_set_vf_vlan)
1749 			return err;
1750 
1751 		nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
1752 			if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
1753 			    nla_len(attr) < NLA_HDRLEN) {
1754 				return -EINVAL;
1755 			}
1756 			if (len >= MAX_VLAN_LIST_LEN)
1757 				return -EOPNOTSUPP;
1758 			ivvl[len] = nla_data(attr);
1759 
1760 			len++;
1761 		}
1762 		if (len == 0)
1763 			return -EINVAL;
1764 
1765 		err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
1766 					   ivvl[0]->qos, ivvl[0]->vlan_proto);
1767 		if (err < 0)
1768 			return err;
1769 	}
1770 
1771 	if (tb[IFLA_VF_TX_RATE]) {
1772 		struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1773 		struct ifla_vf_info ivf;
1774 
1775 		err = -EOPNOTSUPP;
1776 		if (ops->ndo_get_vf_config)
1777 			err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1778 		if (err < 0)
1779 			return err;
1780 
1781 		err = -EOPNOTSUPP;
1782 		if (ops->ndo_set_vf_rate)
1783 			err = ops->ndo_set_vf_rate(dev, ivt->vf,
1784 						   ivf.min_tx_rate,
1785 						   ivt->rate);
1786 		if (err < 0)
1787 			return err;
1788 	}
1789 
1790 	if (tb[IFLA_VF_RATE]) {
1791 		struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1792 
1793 		err = -EOPNOTSUPP;
1794 		if (ops->ndo_set_vf_rate)
1795 			err = ops->ndo_set_vf_rate(dev, ivt->vf,
1796 						   ivt->min_tx_rate,
1797 						   ivt->max_tx_rate);
1798 		if (err < 0)
1799 			return err;
1800 	}
1801 
1802 	if (tb[IFLA_VF_SPOOFCHK]) {
1803 		struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1804 
1805 		err = -EOPNOTSUPP;
1806 		if (ops->ndo_set_vf_spoofchk)
1807 			err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1808 						       ivs->setting);
1809 		if (err < 0)
1810 			return err;
1811 	}
1812 
1813 	if (tb[IFLA_VF_LINK_STATE]) {
1814 		struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1815 
1816 		err = -EOPNOTSUPP;
1817 		if (ops->ndo_set_vf_link_state)
1818 			err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1819 							 ivl->link_state);
1820 		if (err < 0)
1821 			return err;
1822 	}
1823 
1824 	if (tb[IFLA_VF_RSS_QUERY_EN]) {
1825 		struct ifla_vf_rss_query_en *ivrssq_en;
1826 
1827 		err = -EOPNOTSUPP;
1828 		ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1829 		if (ops->ndo_set_vf_rss_query_en)
1830 			err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1831 							   ivrssq_en->setting);
1832 		if (err < 0)
1833 			return err;
1834 	}
1835 
1836 	if (tb[IFLA_VF_TRUST]) {
1837 		struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1838 
1839 		err = -EOPNOTSUPP;
1840 		if (ops->ndo_set_vf_trust)
1841 			err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1842 		if (err < 0)
1843 			return err;
1844 	}
1845 
1846 	if (tb[IFLA_VF_IB_NODE_GUID]) {
1847 		struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
1848 
1849 		if (!ops->ndo_set_vf_guid)
1850 			return -EOPNOTSUPP;
1851 
1852 		return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
1853 	}
1854 
1855 	if (tb[IFLA_VF_IB_PORT_GUID]) {
1856 		struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
1857 
1858 		if (!ops->ndo_set_vf_guid)
1859 			return -EOPNOTSUPP;
1860 
1861 		return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
1862 	}
1863 
1864 	return err;
1865 }
1866 
1867 static int do_set_master(struct net_device *dev, int ifindex)
1868 {
1869 	struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1870 	const struct net_device_ops *ops;
1871 	int err;
1872 
1873 	if (upper_dev) {
1874 		if (upper_dev->ifindex == ifindex)
1875 			return 0;
1876 		ops = upper_dev->netdev_ops;
1877 		if (ops->ndo_del_slave) {
1878 			err = ops->ndo_del_slave(upper_dev, dev);
1879 			if (err)
1880 				return err;
1881 		} else {
1882 			return -EOPNOTSUPP;
1883 		}
1884 	}
1885 
1886 	if (ifindex) {
1887 		upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1888 		if (!upper_dev)
1889 			return -EINVAL;
1890 		ops = upper_dev->netdev_ops;
1891 		if (ops->ndo_add_slave) {
1892 			err = ops->ndo_add_slave(upper_dev, dev);
1893 			if (err)
1894 				return err;
1895 		} else {
1896 			return -EOPNOTSUPP;
1897 		}
1898 	}
1899 	return 0;
1900 }
1901 
1902 #define DO_SETLINK_MODIFIED	0x01
1903 /* notify flag means notify + modified. */
1904 #define DO_SETLINK_NOTIFY	0x03
1905 static int do_setlink(const struct sk_buff *skb,
1906 		      struct net_device *dev, struct ifinfomsg *ifm,
1907 		      struct nlattr **tb, char *ifname, int status)
1908 {
1909 	const struct net_device_ops *ops = dev->netdev_ops;
1910 	int err;
1911 
1912 	if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1913 		struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1914 		if (IS_ERR(net)) {
1915 			err = PTR_ERR(net);
1916 			goto errout;
1917 		}
1918 		if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1919 			put_net(net);
1920 			err = -EPERM;
1921 			goto errout;
1922 		}
1923 		err = dev_change_net_namespace(dev, net, ifname);
1924 		put_net(net);
1925 		if (err)
1926 			goto errout;
1927 		status |= DO_SETLINK_MODIFIED;
1928 	}
1929 
1930 	if (tb[IFLA_MAP]) {
1931 		struct rtnl_link_ifmap *u_map;
1932 		struct ifmap k_map;
1933 
1934 		if (!ops->ndo_set_config) {
1935 			err = -EOPNOTSUPP;
1936 			goto errout;
1937 		}
1938 
1939 		if (!netif_device_present(dev)) {
1940 			err = -ENODEV;
1941 			goto errout;
1942 		}
1943 
1944 		u_map = nla_data(tb[IFLA_MAP]);
1945 		k_map.mem_start = (unsigned long) u_map->mem_start;
1946 		k_map.mem_end = (unsigned long) u_map->mem_end;
1947 		k_map.base_addr = (unsigned short) u_map->base_addr;
1948 		k_map.irq = (unsigned char) u_map->irq;
1949 		k_map.dma = (unsigned char) u_map->dma;
1950 		k_map.port = (unsigned char) u_map->port;
1951 
1952 		err = ops->ndo_set_config(dev, &k_map);
1953 		if (err < 0)
1954 			goto errout;
1955 
1956 		status |= DO_SETLINK_NOTIFY;
1957 	}
1958 
1959 	if (tb[IFLA_ADDRESS]) {
1960 		struct sockaddr *sa;
1961 		int len;
1962 
1963 		len = sizeof(sa_family_t) + dev->addr_len;
1964 		sa = kmalloc(len, GFP_KERNEL);
1965 		if (!sa) {
1966 			err = -ENOMEM;
1967 			goto errout;
1968 		}
1969 		sa->sa_family = dev->type;
1970 		memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1971 		       dev->addr_len);
1972 		err = dev_set_mac_address(dev, sa);
1973 		kfree(sa);
1974 		if (err)
1975 			goto errout;
1976 		status |= DO_SETLINK_MODIFIED;
1977 	}
1978 
1979 	if (tb[IFLA_MTU]) {
1980 		err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1981 		if (err < 0)
1982 			goto errout;
1983 		status |= DO_SETLINK_MODIFIED;
1984 	}
1985 
1986 	if (tb[IFLA_GROUP]) {
1987 		dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1988 		status |= DO_SETLINK_NOTIFY;
1989 	}
1990 
1991 	/*
1992 	 * Interface selected by interface index but interface
1993 	 * name provided implies that a name change has been
1994 	 * requested.
1995 	 */
1996 	if (ifm->ifi_index > 0 && ifname[0]) {
1997 		err = dev_change_name(dev, ifname);
1998 		if (err < 0)
1999 			goto errout;
2000 		status |= DO_SETLINK_MODIFIED;
2001 	}
2002 
2003 	if (tb[IFLA_IFALIAS]) {
2004 		err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2005 				    nla_len(tb[IFLA_IFALIAS]));
2006 		if (err < 0)
2007 			goto errout;
2008 		status |= DO_SETLINK_NOTIFY;
2009 	}
2010 
2011 	if (tb[IFLA_BROADCAST]) {
2012 		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2013 		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2014 	}
2015 
2016 	if (ifm->ifi_flags || ifm->ifi_change) {
2017 		err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2018 		if (err < 0)
2019 			goto errout;
2020 	}
2021 
2022 	if (tb[IFLA_MASTER]) {
2023 		err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
2024 		if (err)
2025 			goto errout;
2026 		status |= DO_SETLINK_MODIFIED;
2027 	}
2028 
2029 	if (tb[IFLA_CARRIER]) {
2030 		err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2031 		if (err)
2032 			goto errout;
2033 		status |= DO_SETLINK_MODIFIED;
2034 	}
2035 
2036 	if (tb[IFLA_TXQLEN]) {
2037 		unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
2038 		unsigned long orig_len = dev->tx_queue_len;
2039 
2040 		if (dev->tx_queue_len ^ value) {
2041 			dev->tx_queue_len = value;
2042 			err = call_netdevice_notifiers(
2043 			      NETDEV_CHANGE_TX_QUEUE_LEN, dev);
2044 			err = notifier_to_errno(err);
2045 			if (err) {
2046 				dev->tx_queue_len = orig_len;
2047 				goto errout;
2048 			}
2049 			status |= DO_SETLINK_NOTIFY;
2050 		}
2051 	}
2052 
2053 	if (tb[IFLA_OPERSTATE])
2054 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2055 
2056 	if (tb[IFLA_LINKMODE]) {
2057 		unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2058 
2059 		write_lock_bh(&dev_base_lock);
2060 		if (dev->link_mode ^ value)
2061 			status |= DO_SETLINK_NOTIFY;
2062 		dev->link_mode = value;
2063 		write_unlock_bh(&dev_base_lock);
2064 	}
2065 
2066 	if (tb[IFLA_VFINFO_LIST]) {
2067 		struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2068 		struct nlattr *attr;
2069 		int rem;
2070 
2071 		nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2072 			if (nla_type(attr) != IFLA_VF_INFO ||
2073 			    nla_len(attr) < NLA_HDRLEN) {
2074 				err = -EINVAL;
2075 				goto errout;
2076 			}
2077 			err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2078 					       ifla_vf_policy);
2079 			if (err < 0)
2080 				goto errout;
2081 			err = do_setvfinfo(dev, vfinfo);
2082 			if (err < 0)
2083 				goto errout;
2084 			status |= DO_SETLINK_NOTIFY;
2085 		}
2086 	}
2087 	err = 0;
2088 
2089 	if (tb[IFLA_VF_PORTS]) {
2090 		struct nlattr *port[IFLA_PORT_MAX+1];
2091 		struct nlattr *attr;
2092 		int vf;
2093 		int rem;
2094 
2095 		err = -EOPNOTSUPP;
2096 		if (!ops->ndo_set_vf_port)
2097 			goto errout;
2098 
2099 		nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2100 			if (nla_type(attr) != IFLA_VF_PORT ||
2101 			    nla_len(attr) < NLA_HDRLEN) {
2102 				err = -EINVAL;
2103 				goto errout;
2104 			}
2105 			err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2106 					       ifla_port_policy);
2107 			if (err < 0)
2108 				goto errout;
2109 			if (!port[IFLA_PORT_VF]) {
2110 				err = -EOPNOTSUPP;
2111 				goto errout;
2112 			}
2113 			vf = nla_get_u32(port[IFLA_PORT_VF]);
2114 			err = ops->ndo_set_vf_port(dev, vf, port);
2115 			if (err < 0)
2116 				goto errout;
2117 			status |= DO_SETLINK_NOTIFY;
2118 		}
2119 	}
2120 	err = 0;
2121 
2122 	if (tb[IFLA_PORT_SELF]) {
2123 		struct nlattr *port[IFLA_PORT_MAX+1];
2124 
2125 		err = nla_parse_nested(port, IFLA_PORT_MAX,
2126 			tb[IFLA_PORT_SELF], ifla_port_policy);
2127 		if (err < 0)
2128 			goto errout;
2129 
2130 		err = -EOPNOTSUPP;
2131 		if (ops->ndo_set_vf_port)
2132 			err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2133 		if (err < 0)
2134 			goto errout;
2135 		status |= DO_SETLINK_NOTIFY;
2136 	}
2137 
2138 	if (tb[IFLA_AF_SPEC]) {
2139 		struct nlattr *af;
2140 		int rem;
2141 
2142 		nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2143 			const struct rtnl_af_ops *af_ops;
2144 
2145 			if (!(af_ops = rtnl_af_lookup(nla_type(af))))
2146 				BUG();
2147 
2148 			err = af_ops->set_link_af(dev, af);
2149 			if (err < 0)
2150 				goto errout;
2151 
2152 			status |= DO_SETLINK_NOTIFY;
2153 		}
2154 	}
2155 	err = 0;
2156 
2157 	if (tb[IFLA_PROTO_DOWN]) {
2158 		err = dev_change_proto_down(dev,
2159 					    nla_get_u8(tb[IFLA_PROTO_DOWN]));
2160 		if (err)
2161 			goto errout;
2162 		status |= DO_SETLINK_NOTIFY;
2163 	}
2164 
2165 	if (tb[IFLA_XDP]) {
2166 		struct nlattr *xdp[IFLA_XDP_MAX + 1];
2167 
2168 		err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2169 				       ifla_xdp_policy);
2170 		if (err < 0)
2171 			goto errout;
2172 
2173 		if (xdp[IFLA_XDP_ATTACHED]) {
2174 			err = -EINVAL;
2175 			goto errout;
2176 		}
2177 		if (xdp[IFLA_XDP_FD]) {
2178 			err = dev_change_xdp_fd(dev,
2179 						nla_get_s32(xdp[IFLA_XDP_FD]));
2180 			if (err)
2181 				goto errout;
2182 			status |= DO_SETLINK_NOTIFY;
2183 		}
2184 	}
2185 
2186 errout:
2187 	if (status & DO_SETLINK_MODIFIED) {
2188 		if (status & DO_SETLINK_NOTIFY)
2189 			netdev_state_change(dev);
2190 
2191 		if (err < 0)
2192 			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",
2193 					     dev->name);
2194 	}
2195 
2196 	return err;
2197 }
2198 
2199 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2200 {
2201 	struct net *net = sock_net(skb->sk);
2202 	struct ifinfomsg *ifm;
2203 	struct net_device *dev;
2204 	int err;
2205 	struct nlattr *tb[IFLA_MAX+1];
2206 	char ifname[IFNAMSIZ];
2207 
2208 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2209 	if (err < 0)
2210 		goto errout;
2211 
2212 	if (tb[IFLA_IFNAME])
2213 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2214 	else
2215 		ifname[0] = '\0';
2216 
2217 	err = -EINVAL;
2218 	ifm = nlmsg_data(nlh);
2219 	if (ifm->ifi_index > 0)
2220 		dev = __dev_get_by_index(net, ifm->ifi_index);
2221 	else if (tb[IFLA_IFNAME])
2222 		dev = __dev_get_by_name(net, ifname);
2223 	else
2224 		goto errout;
2225 
2226 	if (dev == NULL) {
2227 		err = -ENODEV;
2228 		goto errout;
2229 	}
2230 
2231 	err = validate_linkmsg(dev, tb);
2232 	if (err < 0)
2233 		goto errout;
2234 
2235 	err = do_setlink(skb, dev, ifm, tb, ifname, 0);
2236 errout:
2237 	return err;
2238 }
2239 
2240 static int rtnl_group_dellink(const struct net *net, int group)
2241 {
2242 	struct net_device *dev, *aux;
2243 	LIST_HEAD(list_kill);
2244 	bool found = false;
2245 
2246 	if (!group)
2247 		return -EPERM;
2248 
2249 	for_each_netdev(net, dev) {
2250 		if (dev->group == group) {
2251 			const struct rtnl_link_ops *ops;
2252 
2253 			found = true;
2254 			ops = dev->rtnl_link_ops;
2255 			if (!ops || !ops->dellink)
2256 				return -EOPNOTSUPP;
2257 		}
2258 	}
2259 
2260 	if (!found)
2261 		return -ENODEV;
2262 
2263 	for_each_netdev_safe(net, dev, aux) {
2264 		if (dev->group == group) {
2265 			const struct rtnl_link_ops *ops;
2266 
2267 			ops = dev->rtnl_link_ops;
2268 			ops->dellink(dev, &list_kill);
2269 		}
2270 	}
2271 	unregister_netdevice_many(&list_kill);
2272 
2273 	return 0;
2274 }
2275 
2276 int rtnl_delete_link(struct net_device *dev)
2277 {
2278 	const struct rtnl_link_ops *ops;
2279 	LIST_HEAD(list_kill);
2280 
2281 	ops = dev->rtnl_link_ops;
2282 	if (!ops || !ops->dellink)
2283 		return -EOPNOTSUPP;
2284 
2285 	ops->dellink(dev, &list_kill);
2286 	unregister_netdevice_many(&list_kill);
2287 
2288 	return 0;
2289 }
2290 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2291 
2292 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2293 {
2294 	struct net *net = sock_net(skb->sk);
2295 	struct net_device *dev;
2296 	struct ifinfomsg *ifm;
2297 	char ifname[IFNAMSIZ];
2298 	struct nlattr *tb[IFLA_MAX+1];
2299 	int err;
2300 
2301 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2302 	if (err < 0)
2303 		return err;
2304 
2305 	if (tb[IFLA_IFNAME])
2306 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2307 
2308 	ifm = nlmsg_data(nlh);
2309 	if (ifm->ifi_index > 0)
2310 		dev = __dev_get_by_index(net, ifm->ifi_index);
2311 	else if (tb[IFLA_IFNAME])
2312 		dev = __dev_get_by_name(net, ifname);
2313 	else if (tb[IFLA_GROUP])
2314 		return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2315 	else
2316 		return -EINVAL;
2317 
2318 	if (!dev)
2319 		return -ENODEV;
2320 
2321 	return rtnl_delete_link(dev);
2322 }
2323 
2324 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2325 {
2326 	unsigned int old_flags;
2327 	int err;
2328 
2329 	old_flags = dev->flags;
2330 	if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2331 		err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2332 		if (err < 0)
2333 			return err;
2334 	}
2335 
2336 	dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2337 
2338 	__dev_notify_flags(dev, old_flags, ~0U);
2339 	return 0;
2340 }
2341 EXPORT_SYMBOL(rtnl_configure_link);
2342 
2343 struct net_device *rtnl_create_link(struct net *net,
2344 	const char *ifname, unsigned char name_assign_type,
2345 	const struct rtnl_link_ops *ops, struct nlattr *tb[])
2346 {
2347 	int err;
2348 	struct net_device *dev;
2349 	unsigned int num_tx_queues = 1;
2350 	unsigned int num_rx_queues = 1;
2351 
2352 	if (tb[IFLA_NUM_TX_QUEUES])
2353 		num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2354 	else if (ops->get_num_tx_queues)
2355 		num_tx_queues = ops->get_num_tx_queues();
2356 
2357 	if (tb[IFLA_NUM_RX_QUEUES])
2358 		num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2359 	else if (ops->get_num_rx_queues)
2360 		num_rx_queues = ops->get_num_rx_queues();
2361 
2362 	err = -ENOMEM;
2363 	dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2364 			       ops->setup, num_tx_queues, num_rx_queues);
2365 	if (!dev)
2366 		goto err;
2367 
2368 	dev_net_set(dev, net);
2369 	dev->rtnl_link_ops = ops;
2370 	dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2371 
2372 	if (tb[IFLA_MTU])
2373 		dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2374 	if (tb[IFLA_ADDRESS]) {
2375 		memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2376 				nla_len(tb[IFLA_ADDRESS]));
2377 		dev->addr_assign_type = NET_ADDR_SET;
2378 	}
2379 	if (tb[IFLA_BROADCAST])
2380 		memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2381 				nla_len(tb[IFLA_BROADCAST]));
2382 	if (tb[IFLA_TXQLEN])
2383 		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2384 	if (tb[IFLA_OPERSTATE])
2385 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2386 	if (tb[IFLA_LINKMODE])
2387 		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2388 	if (tb[IFLA_GROUP])
2389 		dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2390 
2391 	return dev;
2392 
2393 err:
2394 	return ERR_PTR(err);
2395 }
2396 EXPORT_SYMBOL(rtnl_create_link);
2397 
2398 static int rtnl_group_changelink(const struct sk_buff *skb,
2399 		struct net *net, int group,
2400 		struct ifinfomsg *ifm,
2401 		struct nlattr **tb)
2402 {
2403 	struct net_device *dev, *aux;
2404 	int err;
2405 
2406 	for_each_netdev_safe(net, dev, aux) {
2407 		if (dev->group == group) {
2408 			err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2409 			if (err < 0)
2410 				return err;
2411 		}
2412 	}
2413 
2414 	return 0;
2415 }
2416 
2417 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2418 {
2419 	struct net *net = sock_net(skb->sk);
2420 	const struct rtnl_link_ops *ops;
2421 	const struct rtnl_link_ops *m_ops = NULL;
2422 	struct net_device *dev;
2423 	struct net_device *master_dev = NULL;
2424 	struct ifinfomsg *ifm;
2425 	char kind[MODULE_NAME_LEN];
2426 	char ifname[IFNAMSIZ];
2427 	struct nlattr *tb[IFLA_MAX+1];
2428 	struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2429 	unsigned char name_assign_type = NET_NAME_USER;
2430 	int err;
2431 
2432 #ifdef CONFIG_MODULES
2433 replay:
2434 #endif
2435 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2436 	if (err < 0)
2437 		return err;
2438 
2439 	if (tb[IFLA_IFNAME])
2440 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2441 	else
2442 		ifname[0] = '\0';
2443 
2444 	ifm = nlmsg_data(nlh);
2445 	if (ifm->ifi_index > 0)
2446 		dev = __dev_get_by_index(net, ifm->ifi_index);
2447 	else {
2448 		if (ifname[0])
2449 			dev = __dev_get_by_name(net, ifname);
2450 		else
2451 			dev = NULL;
2452 	}
2453 
2454 	if (dev) {
2455 		master_dev = netdev_master_upper_dev_get(dev);
2456 		if (master_dev)
2457 			m_ops = master_dev->rtnl_link_ops;
2458 	}
2459 
2460 	err = validate_linkmsg(dev, tb);
2461 	if (err < 0)
2462 		return err;
2463 
2464 	if (tb[IFLA_LINKINFO]) {
2465 		err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2466 				       tb[IFLA_LINKINFO], ifla_info_policy);
2467 		if (err < 0)
2468 			return err;
2469 	} else
2470 		memset(linkinfo, 0, sizeof(linkinfo));
2471 
2472 	if (linkinfo[IFLA_INFO_KIND]) {
2473 		nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2474 		ops = rtnl_link_ops_get(kind);
2475 	} else {
2476 		kind[0] = '\0';
2477 		ops = NULL;
2478 	}
2479 
2480 	if (1) {
2481 		struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2482 		struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2483 		struct nlattr **data = NULL;
2484 		struct nlattr **slave_data = NULL;
2485 		struct net *dest_net, *link_net = NULL;
2486 
2487 		if (ops) {
2488 			if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2489 				err = nla_parse_nested(attr, ops->maxtype,
2490 						       linkinfo[IFLA_INFO_DATA],
2491 						       ops->policy);
2492 				if (err < 0)
2493 					return err;
2494 				data = attr;
2495 			}
2496 			if (ops->validate) {
2497 				err = ops->validate(tb, data);
2498 				if (err < 0)
2499 					return err;
2500 			}
2501 		}
2502 
2503 		if (m_ops) {
2504 			if (m_ops->slave_maxtype &&
2505 			    linkinfo[IFLA_INFO_SLAVE_DATA]) {
2506 				err = nla_parse_nested(slave_attr,
2507 						       m_ops->slave_maxtype,
2508 						       linkinfo[IFLA_INFO_SLAVE_DATA],
2509 						       m_ops->slave_policy);
2510 				if (err < 0)
2511 					return err;
2512 				slave_data = slave_attr;
2513 			}
2514 			if (m_ops->slave_validate) {
2515 				err = m_ops->slave_validate(tb, slave_data);
2516 				if (err < 0)
2517 					return err;
2518 			}
2519 		}
2520 
2521 		if (dev) {
2522 			int status = 0;
2523 
2524 			if (nlh->nlmsg_flags & NLM_F_EXCL)
2525 				return -EEXIST;
2526 			if (nlh->nlmsg_flags & NLM_F_REPLACE)
2527 				return -EOPNOTSUPP;
2528 
2529 			if (linkinfo[IFLA_INFO_DATA]) {
2530 				if (!ops || ops != dev->rtnl_link_ops ||
2531 				    !ops->changelink)
2532 					return -EOPNOTSUPP;
2533 
2534 				err = ops->changelink(dev, tb, data);
2535 				if (err < 0)
2536 					return err;
2537 				status |= DO_SETLINK_NOTIFY;
2538 			}
2539 
2540 			if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2541 				if (!m_ops || !m_ops->slave_changelink)
2542 					return -EOPNOTSUPP;
2543 
2544 				err = m_ops->slave_changelink(master_dev, dev,
2545 							      tb, slave_data);
2546 				if (err < 0)
2547 					return err;
2548 				status |= DO_SETLINK_NOTIFY;
2549 			}
2550 
2551 			return do_setlink(skb, dev, ifm, tb, ifname, status);
2552 		}
2553 
2554 		if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2555 			if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2556 				return rtnl_group_changelink(skb, net,
2557 						nla_get_u32(tb[IFLA_GROUP]),
2558 						ifm, tb);
2559 			return -ENODEV;
2560 		}
2561 
2562 		if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2563 			return -EOPNOTSUPP;
2564 
2565 		if (!ops) {
2566 #ifdef CONFIG_MODULES
2567 			if (kind[0]) {
2568 				__rtnl_unlock();
2569 				request_module("rtnl-link-%s", kind);
2570 				rtnl_lock();
2571 				ops = rtnl_link_ops_get(kind);
2572 				if (ops)
2573 					goto replay;
2574 			}
2575 #endif
2576 			return -EOPNOTSUPP;
2577 		}
2578 
2579 		if (!ops->setup)
2580 			return -EOPNOTSUPP;
2581 
2582 		if (!ifname[0]) {
2583 			snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2584 			name_assign_type = NET_NAME_ENUM;
2585 		}
2586 
2587 		dest_net = rtnl_link_get_net(net, tb);
2588 		if (IS_ERR(dest_net))
2589 			return PTR_ERR(dest_net);
2590 
2591 		err = -EPERM;
2592 		if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2593 			goto out;
2594 
2595 		if (tb[IFLA_LINK_NETNSID]) {
2596 			int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2597 
2598 			link_net = get_net_ns_by_id(dest_net, id);
2599 			if (!link_net) {
2600 				err =  -EINVAL;
2601 				goto out;
2602 			}
2603 			err = -EPERM;
2604 			if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2605 				goto out;
2606 		}
2607 
2608 		dev = rtnl_create_link(link_net ? : dest_net, ifname,
2609 				       name_assign_type, ops, tb);
2610 		if (IS_ERR(dev)) {
2611 			err = PTR_ERR(dev);
2612 			goto out;
2613 		}
2614 
2615 		dev->ifindex = ifm->ifi_index;
2616 
2617 		if (ops->newlink) {
2618 			err = ops->newlink(link_net ? : net, dev, tb, data);
2619 			/* Drivers should call free_netdev() in ->destructor
2620 			 * and unregister it on failure after registration
2621 			 * so that device could be finally freed in rtnl_unlock.
2622 			 */
2623 			if (err < 0) {
2624 				/* If device is not registered at all, free it now */
2625 				if (dev->reg_state == NETREG_UNINITIALIZED)
2626 					free_netdev(dev);
2627 				goto out;
2628 			}
2629 		} else {
2630 			err = register_netdevice(dev);
2631 			if (err < 0) {
2632 				free_netdev(dev);
2633 				goto out;
2634 			}
2635 		}
2636 		err = rtnl_configure_link(dev, ifm);
2637 		if (err < 0)
2638 			goto out_unregister;
2639 		if (link_net) {
2640 			err = dev_change_net_namespace(dev, dest_net, ifname);
2641 			if (err < 0)
2642 				goto out_unregister;
2643 		}
2644 out:
2645 		if (link_net)
2646 			put_net(link_net);
2647 		put_net(dest_net);
2648 		return err;
2649 out_unregister:
2650 		if (ops->newlink) {
2651 			LIST_HEAD(list_kill);
2652 
2653 			ops->dellink(dev, &list_kill);
2654 			unregister_netdevice_many(&list_kill);
2655 		} else {
2656 			unregister_netdevice(dev);
2657 		}
2658 		goto out;
2659 	}
2660 }
2661 
2662 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2663 {
2664 	struct net *net = sock_net(skb->sk);
2665 	struct ifinfomsg *ifm;
2666 	char ifname[IFNAMSIZ];
2667 	struct nlattr *tb[IFLA_MAX+1];
2668 	struct net_device *dev = NULL;
2669 	struct sk_buff *nskb;
2670 	int err;
2671 	u32 ext_filter_mask = 0;
2672 
2673 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2674 	if (err < 0)
2675 		return err;
2676 
2677 	if (tb[IFLA_IFNAME])
2678 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2679 
2680 	if (tb[IFLA_EXT_MASK])
2681 		ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2682 
2683 	ifm = nlmsg_data(nlh);
2684 	if (ifm->ifi_index > 0)
2685 		dev = __dev_get_by_index(net, ifm->ifi_index);
2686 	else if (tb[IFLA_IFNAME])
2687 		dev = __dev_get_by_name(net, ifname);
2688 	else
2689 		return -EINVAL;
2690 
2691 	if (dev == NULL)
2692 		return -ENODEV;
2693 
2694 	nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2695 	if (nskb == NULL)
2696 		return -ENOBUFS;
2697 
2698 	err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2699 			       nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2700 	if (err < 0) {
2701 		/* -EMSGSIZE implies BUG in if_nlmsg_size */
2702 		WARN_ON(err == -EMSGSIZE);
2703 		kfree_skb(nskb);
2704 	} else
2705 		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2706 
2707 	return err;
2708 }
2709 
2710 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2711 {
2712 	struct net *net = sock_net(skb->sk);
2713 	struct net_device *dev;
2714 	struct nlattr *tb[IFLA_MAX+1];
2715 	u32 ext_filter_mask = 0;
2716 	u16 min_ifinfo_dump_size = 0;
2717 	int hdrlen;
2718 
2719 	/* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2720 	hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2721 		 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2722 
2723 	if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2724 		if (tb[IFLA_EXT_MASK])
2725 			ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2726 	}
2727 
2728 	if (!ext_filter_mask)
2729 		return NLMSG_GOODSIZE;
2730 	/*
2731 	 * traverse the list of net devices and compute the minimum
2732 	 * buffer size based upon the filter mask.
2733 	 */
2734 	list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2735 		min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2736 					     if_nlmsg_size(dev,
2737 						           ext_filter_mask));
2738 	}
2739 
2740 	return nlmsg_total_size(min_ifinfo_dump_size);
2741 }
2742 
2743 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2744 {
2745 	int idx;
2746 	int s_idx = cb->family;
2747 
2748 	if (s_idx == 0)
2749 		s_idx = 1;
2750 	for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2751 		int type = cb->nlh->nlmsg_type-RTM_BASE;
2752 		if (idx < s_idx || idx == PF_PACKET)
2753 			continue;
2754 		if (rtnl_msg_handlers[idx] == NULL ||
2755 		    rtnl_msg_handlers[idx][type].dumpit == NULL)
2756 			continue;
2757 		if (idx > s_idx) {
2758 			memset(&cb->args[0], 0, sizeof(cb->args));
2759 			cb->prev_seq = 0;
2760 			cb->seq = 0;
2761 		}
2762 		if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2763 			break;
2764 	}
2765 	cb->family = idx;
2766 
2767 	return skb->len;
2768 }
2769 
2770 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2771 				       unsigned int change, gfp_t flags)
2772 {
2773 	struct net *net = dev_net(dev);
2774 	struct sk_buff *skb;
2775 	int err = -ENOBUFS;
2776 	size_t if_info_size;
2777 
2778 	skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2779 	if (skb == NULL)
2780 		goto errout;
2781 
2782 	err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2783 	if (err < 0) {
2784 		/* -EMSGSIZE implies BUG in if_nlmsg_size() */
2785 		WARN_ON(err == -EMSGSIZE);
2786 		kfree_skb(skb);
2787 		goto errout;
2788 	}
2789 	return skb;
2790 errout:
2791 	if (err < 0)
2792 		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2793 	return NULL;
2794 }
2795 
2796 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2797 {
2798 	struct net *net = dev_net(dev);
2799 
2800 	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2801 }
2802 
2803 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2804 		  gfp_t flags)
2805 {
2806 	struct sk_buff *skb;
2807 
2808 	if (dev->reg_state != NETREG_REGISTERED)
2809 		return;
2810 
2811 	skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2812 	if (skb)
2813 		rtmsg_ifinfo_send(skb, dev, flags);
2814 }
2815 EXPORT_SYMBOL(rtmsg_ifinfo);
2816 
2817 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2818 				   struct net_device *dev,
2819 				   u8 *addr, u16 vid, u32 pid, u32 seq,
2820 				   int type, unsigned int flags,
2821 				   int nlflags, u16 ndm_state)
2822 {
2823 	struct nlmsghdr *nlh;
2824 	struct ndmsg *ndm;
2825 
2826 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2827 	if (!nlh)
2828 		return -EMSGSIZE;
2829 
2830 	ndm = nlmsg_data(nlh);
2831 	ndm->ndm_family  = AF_BRIDGE;
2832 	ndm->ndm_pad1	 = 0;
2833 	ndm->ndm_pad2    = 0;
2834 	ndm->ndm_flags	 = flags;
2835 	ndm->ndm_type	 = 0;
2836 	ndm->ndm_ifindex = dev->ifindex;
2837 	ndm->ndm_state   = ndm_state;
2838 
2839 	if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2840 		goto nla_put_failure;
2841 	if (vid)
2842 		if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2843 			goto nla_put_failure;
2844 
2845 	nlmsg_end(skb, nlh);
2846 	return 0;
2847 
2848 nla_put_failure:
2849 	nlmsg_cancel(skb, nlh);
2850 	return -EMSGSIZE;
2851 }
2852 
2853 static inline size_t rtnl_fdb_nlmsg_size(void)
2854 {
2855 	return NLMSG_ALIGN(sizeof(struct ndmsg)) +
2856 	       nla_total_size(ETH_ALEN) +	/* NDA_LLADDR */
2857 	       nla_total_size(sizeof(u16)) +	/* NDA_VLAN */
2858 	       0;
2859 }
2860 
2861 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
2862 			    u16 ndm_state)
2863 {
2864 	struct net *net = dev_net(dev);
2865 	struct sk_buff *skb;
2866 	int err = -ENOBUFS;
2867 
2868 	skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2869 	if (!skb)
2870 		goto errout;
2871 
2872 	err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2873 				      0, 0, type, NTF_SELF, 0, ndm_state);
2874 	if (err < 0) {
2875 		kfree_skb(skb);
2876 		goto errout;
2877 	}
2878 
2879 	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2880 	return;
2881 errout:
2882 	rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2883 }
2884 
2885 /**
2886  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2887  */
2888 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2889 		     struct nlattr *tb[],
2890 		     struct net_device *dev,
2891 		     const unsigned char *addr, u16 vid,
2892 		     u16 flags)
2893 {
2894 	int err = -EINVAL;
2895 
2896 	/* If aging addresses are supported device will need to
2897 	 * implement its own handler for this.
2898 	 */
2899 	if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2900 		pr_info("%s: FDB only supports static addresses\n", dev->name);
2901 		return err;
2902 	}
2903 
2904 	if (vid) {
2905 		pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2906 		return err;
2907 	}
2908 
2909 	if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2910 		err = dev_uc_add_excl(dev, addr);
2911 	else if (is_multicast_ether_addr(addr))
2912 		err = dev_mc_add_excl(dev, addr);
2913 
2914 	/* Only return duplicate errors if NLM_F_EXCL is set */
2915 	if (err == -EEXIST && !(flags & NLM_F_EXCL))
2916 		err = 0;
2917 
2918 	return err;
2919 }
2920 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2921 
2922 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2923 {
2924 	u16 vid = 0;
2925 
2926 	if (vlan_attr) {
2927 		if (nla_len(vlan_attr) != sizeof(u16)) {
2928 			pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2929 			return -EINVAL;
2930 		}
2931 
2932 		vid = nla_get_u16(vlan_attr);
2933 
2934 		if (!vid || vid >= VLAN_VID_MASK) {
2935 			pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2936 				vid);
2937 			return -EINVAL;
2938 		}
2939 	}
2940 	*p_vid = vid;
2941 	return 0;
2942 }
2943 
2944 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2945 {
2946 	struct net *net = sock_net(skb->sk);
2947 	struct ndmsg *ndm;
2948 	struct nlattr *tb[NDA_MAX+1];
2949 	struct net_device *dev;
2950 	u8 *addr;
2951 	u16 vid;
2952 	int err;
2953 
2954 	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2955 	if (err < 0)
2956 		return err;
2957 
2958 	ndm = nlmsg_data(nlh);
2959 	if (ndm->ndm_ifindex == 0) {
2960 		pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2961 		return -EINVAL;
2962 	}
2963 
2964 	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2965 	if (dev == NULL) {
2966 		pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2967 		return -ENODEV;
2968 	}
2969 
2970 	if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2971 		pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2972 		return -EINVAL;
2973 	}
2974 
2975 	addr = nla_data(tb[NDA_LLADDR]);
2976 
2977 	err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2978 	if (err)
2979 		return err;
2980 
2981 	err = -EOPNOTSUPP;
2982 
2983 	/* Support fdb on master device the net/bridge default case */
2984 	if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2985 	    (dev->priv_flags & IFF_BRIDGE_PORT)) {
2986 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2987 		const struct net_device_ops *ops = br_dev->netdev_ops;
2988 
2989 		err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2990 				       nlh->nlmsg_flags);
2991 		if (err)
2992 			goto out;
2993 		else
2994 			ndm->ndm_flags &= ~NTF_MASTER;
2995 	}
2996 
2997 	/* Embedded bridge, macvlan, and any other device support */
2998 	if ((ndm->ndm_flags & NTF_SELF)) {
2999 		if (dev->netdev_ops->ndo_fdb_add)
3000 			err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3001 							   vid,
3002 							   nlh->nlmsg_flags);
3003 		else
3004 			err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3005 					       nlh->nlmsg_flags);
3006 
3007 		if (!err) {
3008 			rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3009 					ndm->ndm_state);
3010 			ndm->ndm_flags &= ~NTF_SELF;
3011 		}
3012 	}
3013 out:
3014 	return err;
3015 }
3016 
3017 /**
3018  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3019  */
3020 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3021 		     struct nlattr *tb[],
3022 		     struct net_device *dev,
3023 		     const unsigned char *addr, u16 vid)
3024 {
3025 	int err = -EINVAL;
3026 
3027 	/* If aging addresses are supported device will need to
3028 	 * implement its own handler for this.
3029 	 */
3030 	if (!(ndm->ndm_state & NUD_PERMANENT)) {
3031 		pr_info("%s: FDB only supports static addresses\n", dev->name);
3032 		return err;
3033 	}
3034 
3035 	if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3036 		err = dev_uc_del(dev, addr);
3037 	else if (is_multicast_ether_addr(addr))
3038 		err = dev_mc_del(dev, addr);
3039 
3040 	return err;
3041 }
3042 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3043 
3044 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
3045 {
3046 	struct net *net = sock_net(skb->sk);
3047 	struct ndmsg *ndm;
3048 	struct nlattr *tb[NDA_MAX+1];
3049 	struct net_device *dev;
3050 	int err = -EINVAL;
3051 	__u8 *addr;
3052 	u16 vid;
3053 
3054 	if (!netlink_capable(skb, CAP_NET_ADMIN))
3055 		return -EPERM;
3056 
3057 	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
3058 	if (err < 0)
3059 		return err;
3060 
3061 	ndm = nlmsg_data(nlh);
3062 	if (ndm->ndm_ifindex == 0) {
3063 		pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
3064 		return -EINVAL;
3065 	}
3066 
3067 	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3068 	if (dev == NULL) {
3069 		pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
3070 		return -ENODEV;
3071 	}
3072 
3073 	if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3074 		pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
3075 		return -EINVAL;
3076 	}
3077 
3078 	addr = nla_data(tb[NDA_LLADDR]);
3079 
3080 	err = fdb_vid_parse(tb[NDA_VLAN], &vid);
3081 	if (err)
3082 		return err;
3083 
3084 	err = -EOPNOTSUPP;
3085 
3086 	/* Support fdb on master device the net/bridge default case */
3087 	if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3088 	    (dev->priv_flags & IFF_BRIDGE_PORT)) {
3089 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3090 		const struct net_device_ops *ops = br_dev->netdev_ops;
3091 
3092 		if (ops->ndo_fdb_del)
3093 			err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3094 
3095 		if (err)
3096 			goto out;
3097 		else
3098 			ndm->ndm_flags &= ~NTF_MASTER;
3099 	}
3100 
3101 	/* Embedded bridge, macvlan, and any other device support */
3102 	if (ndm->ndm_flags & NTF_SELF) {
3103 		if (dev->netdev_ops->ndo_fdb_del)
3104 			err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3105 							   vid);
3106 		else
3107 			err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3108 
3109 		if (!err) {
3110 			rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3111 					ndm->ndm_state);
3112 			ndm->ndm_flags &= ~NTF_SELF;
3113 		}
3114 	}
3115 out:
3116 	return err;
3117 }
3118 
3119 static int nlmsg_populate_fdb(struct sk_buff *skb,
3120 			      struct netlink_callback *cb,
3121 			      struct net_device *dev,
3122 			      int *idx,
3123 			      struct netdev_hw_addr_list *list)
3124 {
3125 	struct netdev_hw_addr *ha;
3126 	int err;
3127 	u32 portid, seq;
3128 
3129 	portid = NETLINK_CB(cb->skb).portid;
3130 	seq = cb->nlh->nlmsg_seq;
3131 
3132 	list_for_each_entry(ha, &list->list, list) {
3133 		if (*idx < cb->args[2])
3134 			goto skip;
3135 
3136 		err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3137 					      portid, seq,
3138 					      RTM_NEWNEIGH, NTF_SELF,
3139 					      NLM_F_MULTI, NUD_PERMANENT);
3140 		if (err < 0)
3141 			return err;
3142 skip:
3143 		*idx += 1;
3144 	}
3145 	return 0;
3146 }
3147 
3148 /**
3149  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3150  * @nlh: netlink message header
3151  * @dev: netdevice
3152  *
3153  * Default netdevice operation to dump the existing unicast address list.
3154  * Returns number of addresses from list put in skb.
3155  */
3156 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3157 		      struct netlink_callback *cb,
3158 		      struct net_device *dev,
3159 		      struct net_device *filter_dev,
3160 		      int *idx)
3161 {
3162 	int err;
3163 
3164 	netif_addr_lock_bh(dev);
3165 	err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3166 	if (err)
3167 		goto out;
3168 	nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3169 out:
3170 	netif_addr_unlock_bh(dev);
3171 	return err;
3172 }
3173 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3174 
3175 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3176 {
3177 	struct net_device *dev;
3178 	struct nlattr *tb[IFLA_MAX+1];
3179 	struct net_device *br_dev = NULL;
3180 	const struct net_device_ops *ops = NULL;
3181 	const struct net_device_ops *cops = NULL;
3182 	struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3183 	struct net *net = sock_net(skb->sk);
3184 	struct hlist_head *head;
3185 	int brport_idx = 0;
3186 	int br_idx = 0;
3187 	int h, s_h;
3188 	int idx = 0, s_idx;
3189 	int err = 0;
3190 	int fidx = 0;
3191 
3192 	if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
3193 			ifla_policy) == 0) {
3194 		if (tb[IFLA_MASTER])
3195 			br_idx = nla_get_u32(tb[IFLA_MASTER]);
3196 	}
3197 
3198 	brport_idx = ifm->ifi_index;
3199 
3200 	if (br_idx) {
3201 		br_dev = __dev_get_by_index(net, br_idx);
3202 		if (!br_dev)
3203 			return -ENODEV;
3204 
3205 		ops = br_dev->netdev_ops;
3206 	}
3207 
3208 	s_h = cb->args[0];
3209 	s_idx = cb->args[1];
3210 
3211 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3212 		idx = 0;
3213 		head = &net->dev_index_head[h];
3214 		hlist_for_each_entry(dev, head, index_hlist) {
3215 
3216 			if (brport_idx && (dev->ifindex != brport_idx))
3217 				continue;
3218 
3219 			if (!br_idx) { /* user did not specify a specific bridge */
3220 				if (dev->priv_flags & IFF_BRIDGE_PORT) {
3221 					br_dev = netdev_master_upper_dev_get(dev);
3222 					cops = br_dev->netdev_ops;
3223 				}
3224 			} else {
3225 				if (dev != br_dev &&
3226 				    !(dev->priv_flags & IFF_BRIDGE_PORT))
3227 					continue;
3228 
3229 				if (br_dev != netdev_master_upper_dev_get(dev) &&
3230 				    !(dev->priv_flags & IFF_EBRIDGE))
3231 					continue;
3232 				cops = ops;
3233 			}
3234 
3235 			if (idx < s_idx)
3236 				goto cont;
3237 
3238 			if (dev->priv_flags & IFF_BRIDGE_PORT) {
3239 				if (cops && cops->ndo_fdb_dump) {
3240 					err = cops->ndo_fdb_dump(skb, cb,
3241 								br_dev, dev,
3242 								&fidx);
3243 					if (err == -EMSGSIZE)
3244 						goto out;
3245 				}
3246 			}
3247 
3248 			if (dev->netdev_ops->ndo_fdb_dump)
3249 				err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
3250 								    dev, NULL,
3251 								    &fidx);
3252 			else
3253 				err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
3254 							&fidx);
3255 			if (err == -EMSGSIZE)
3256 				goto out;
3257 
3258 			cops = NULL;
3259 
3260 			/* reset fdb offset to 0 for rest of the interfaces */
3261 			cb->args[2] = 0;
3262 			fidx = 0;
3263 cont:
3264 			idx++;
3265 		}
3266 	}
3267 
3268 out:
3269 	cb->args[0] = h;
3270 	cb->args[1] = idx;
3271 	cb->args[2] = fidx;
3272 
3273 	return skb->len;
3274 }
3275 
3276 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3277 			       unsigned int attrnum, unsigned int flag)
3278 {
3279 	if (mask & flag)
3280 		return nla_put_u8(skb, attrnum, !!(flags & flag));
3281 	return 0;
3282 }
3283 
3284 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3285 			    struct net_device *dev, u16 mode,
3286 			    u32 flags, u32 mask, int nlflags,
3287 			    u32 filter_mask,
3288 			    int (*vlan_fill)(struct sk_buff *skb,
3289 					     struct net_device *dev,
3290 					     u32 filter_mask))
3291 {
3292 	struct nlmsghdr *nlh;
3293 	struct ifinfomsg *ifm;
3294 	struct nlattr *br_afspec;
3295 	struct nlattr *protinfo;
3296 	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3297 	struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3298 	int err = 0;
3299 
3300 	nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3301 	if (nlh == NULL)
3302 		return -EMSGSIZE;
3303 
3304 	ifm = nlmsg_data(nlh);
3305 	ifm->ifi_family = AF_BRIDGE;
3306 	ifm->__ifi_pad = 0;
3307 	ifm->ifi_type = dev->type;
3308 	ifm->ifi_index = dev->ifindex;
3309 	ifm->ifi_flags = dev_get_flags(dev);
3310 	ifm->ifi_change = 0;
3311 
3312 
3313 	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3314 	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3315 	    nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3316 	    (br_dev &&
3317 	     nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3318 	    (dev->addr_len &&
3319 	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3320 	    (dev->ifindex != dev_get_iflink(dev) &&
3321 	     nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3322 		goto nla_put_failure;
3323 
3324 	br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3325 	if (!br_afspec)
3326 		goto nla_put_failure;
3327 
3328 	if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3329 		nla_nest_cancel(skb, br_afspec);
3330 		goto nla_put_failure;
3331 	}
3332 
3333 	if (mode != BRIDGE_MODE_UNDEF) {
3334 		if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3335 			nla_nest_cancel(skb, br_afspec);
3336 			goto nla_put_failure;
3337 		}
3338 	}
3339 	if (vlan_fill) {
3340 		err = vlan_fill(skb, dev, filter_mask);
3341 		if (err) {
3342 			nla_nest_cancel(skb, br_afspec);
3343 			goto nla_put_failure;
3344 		}
3345 	}
3346 	nla_nest_end(skb, br_afspec);
3347 
3348 	protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3349 	if (!protinfo)
3350 		goto nla_put_failure;
3351 
3352 	if (brport_nla_put_flag(skb, flags, mask,
3353 				IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3354 	    brport_nla_put_flag(skb, flags, mask,
3355 				IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3356 	    brport_nla_put_flag(skb, flags, mask,
3357 				IFLA_BRPORT_FAST_LEAVE,
3358 				BR_MULTICAST_FAST_LEAVE) ||
3359 	    brport_nla_put_flag(skb, flags, mask,
3360 				IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3361 	    brport_nla_put_flag(skb, flags, mask,
3362 				IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3363 	    brport_nla_put_flag(skb, flags, mask,
3364 				IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3365 	    brport_nla_put_flag(skb, flags, mask,
3366 				IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3367 	    brport_nla_put_flag(skb, flags, mask,
3368 				IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3369 		nla_nest_cancel(skb, protinfo);
3370 		goto nla_put_failure;
3371 	}
3372 
3373 	nla_nest_end(skb, protinfo);
3374 
3375 	nlmsg_end(skb, nlh);
3376 	return 0;
3377 nla_put_failure:
3378 	nlmsg_cancel(skb, nlh);
3379 	return err ? err : -EMSGSIZE;
3380 }
3381 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3382 
3383 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3384 {
3385 	struct net *net = sock_net(skb->sk);
3386 	struct net_device *dev;
3387 	int idx = 0;
3388 	u32 portid = NETLINK_CB(cb->skb).portid;
3389 	u32 seq = cb->nlh->nlmsg_seq;
3390 	u32 filter_mask = 0;
3391 	int err;
3392 
3393 	if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3394 		struct nlattr *extfilt;
3395 
3396 		extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3397 					  IFLA_EXT_MASK);
3398 		if (extfilt) {
3399 			if (nla_len(extfilt) < sizeof(filter_mask))
3400 				return -EINVAL;
3401 
3402 			filter_mask = nla_get_u32(extfilt);
3403 		}
3404 	}
3405 
3406 	rcu_read_lock();
3407 	for_each_netdev_rcu(net, dev) {
3408 		const struct net_device_ops *ops = dev->netdev_ops;
3409 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3410 
3411 		if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3412 			if (idx >= cb->args[0]) {
3413 				err = br_dev->netdev_ops->ndo_bridge_getlink(
3414 						skb, portid, seq, dev,
3415 						filter_mask, NLM_F_MULTI);
3416 				if (err < 0 && err != -EOPNOTSUPP)
3417 					break;
3418 			}
3419 			idx++;
3420 		}
3421 
3422 		if (ops->ndo_bridge_getlink) {
3423 			if (idx >= cb->args[0]) {
3424 				err = ops->ndo_bridge_getlink(skb, portid,
3425 							      seq, dev,
3426 							      filter_mask,
3427 							      NLM_F_MULTI);
3428 				if (err < 0 && err != -EOPNOTSUPP)
3429 					break;
3430 			}
3431 			idx++;
3432 		}
3433 	}
3434 	rcu_read_unlock();
3435 	cb->args[0] = idx;
3436 
3437 	return skb->len;
3438 }
3439 
3440 static inline size_t bridge_nlmsg_size(void)
3441 {
3442 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3443 		+ nla_total_size(IFNAMSIZ)	/* IFLA_IFNAME */
3444 		+ nla_total_size(MAX_ADDR_LEN)	/* IFLA_ADDRESS */
3445 		+ nla_total_size(sizeof(u32))	/* IFLA_MASTER */
3446 		+ nla_total_size(sizeof(u32))	/* IFLA_MTU */
3447 		+ nla_total_size(sizeof(u32))	/* IFLA_LINK */
3448 		+ nla_total_size(sizeof(u32))	/* IFLA_OPERSTATE */
3449 		+ nla_total_size(sizeof(u8))	/* IFLA_PROTINFO */
3450 		+ nla_total_size(sizeof(struct nlattr))	/* IFLA_AF_SPEC */
3451 		+ nla_total_size(sizeof(u16))	/* IFLA_BRIDGE_FLAGS */
3452 		+ nla_total_size(sizeof(u16));	/* IFLA_BRIDGE_MODE */
3453 }
3454 
3455 static int rtnl_bridge_notify(struct net_device *dev)
3456 {
3457 	struct net *net = dev_net(dev);
3458 	struct sk_buff *skb;
3459 	int err = -EOPNOTSUPP;
3460 
3461 	if (!dev->netdev_ops->ndo_bridge_getlink)
3462 		return 0;
3463 
3464 	skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3465 	if (!skb) {
3466 		err = -ENOMEM;
3467 		goto errout;
3468 	}
3469 
3470 	err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3471 	if (err < 0)
3472 		goto errout;
3473 
3474 	if (!skb->len)
3475 		goto errout;
3476 
3477 	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3478 	return 0;
3479 errout:
3480 	WARN_ON(err == -EMSGSIZE);
3481 	kfree_skb(skb);
3482 	if (err)
3483 		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3484 	return err;
3485 }
3486 
3487 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3488 {
3489 	struct net *net = sock_net(skb->sk);
3490 	struct ifinfomsg *ifm;
3491 	struct net_device *dev;
3492 	struct nlattr *br_spec, *attr = NULL;
3493 	int rem, err = -EOPNOTSUPP;
3494 	u16 flags = 0;
3495 	bool have_flags = false;
3496 
3497 	if (nlmsg_len(nlh) < sizeof(*ifm))
3498 		return -EINVAL;
3499 
3500 	ifm = nlmsg_data(nlh);
3501 	if (ifm->ifi_family != AF_BRIDGE)
3502 		return -EPFNOSUPPORT;
3503 
3504 	dev = __dev_get_by_index(net, ifm->ifi_index);
3505 	if (!dev) {
3506 		pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3507 		return -ENODEV;
3508 	}
3509 
3510 	br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3511 	if (br_spec) {
3512 		nla_for_each_nested(attr, br_spec, rem) {
3513 			if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3514 				if (nla_len(attr) < sizeof(flags))
3515 					return -EINVAL;
3516 
3517 				have_flags = true;
3518 				flags = nla_get_u16(attr);
3519 				break;
3520 			}
3521 		}
3522 	}
3523 
3524 	if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3525 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3526 
3527 		if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3528 			err = -EOPNOTSUPP;
3529 			goto out;
3530 		}
3531 
3532 		err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3533 		if (err)
3534 			goto out;
3535 
3536 		flags &= ~BRIDGE_FLAGS_MASTER;
3537 	}
3538 
3539 	if ((flags & BRIDGE_FLAGS_SELF)) {
3540 		if (!dev->netdev_ops->ndo_bridge_setlink)
3541 			err = -EOPNOTSUPP;
3542 		else
3543 			err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3544 								  flags);
3545 		if (!err) {
3546 			flags &= ~BRIDGE_FLAGS_SELF;
3547 
3548 			/* Generate event to notify upper layer of bridge
3549 			 * change
3550 			 */
3551 			err = rtnl_bridge_notify(dev);
3552 		}
3553 	}
3554 
3555 	if (have_flags)
3556 		memcpy(nla_data(attr), &flags, sizeof(flags));
3557 out:
3558 	return err;
3559 }
3560 
3561 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3562 {
3563 	struct net *net = sock_net(skb->sk);
3564 	struct ifinfomsg *ifm;
3565 	struct net_device *dev;
3566 	struct nlattr *br_spec, *attr = NULL;
3567 	int rem, err = -EOPNOTSUPP;
3568 	u16 flags = 0;
3569 	bool have_flags = false;
3570 
3571 	if (nlmsg_len(nlh) < sizeof(*ifm))
3572 		return -EINVAL;
3573 
3574 	ifm = nlmsg_data(nlh);
3575 	if (ifm->ifi_family != AF_BRIDGE)
3576 		return -EPFNOSUPPORT;
3577 
3578 	dev = __dev_get_by_index(net, ifm->ifi_index);
3579 	if (!dev) {
3580 		pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3581 		return -ENODEV;
3582 	}
3583 
3584 	br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3585 	if (br_spec) {
3586 		nla_for_each_nested(attr, br_spec, rem) {
3587 			if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3588 				if (nla_len(attr) < sizeof(flags))
3589 					return -EINVAL;
3590 
3591 				have_flags = true;
3592 				flags = nla_get_u16(attr);
3593 				break;
3594 			}
3595 		}
3596 	}
3597 
3598 	if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3599 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3600 
3601 		if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3602 			err = -EOPNOTSUPP;
3603 			goto out;
3604 		}
3605 
3606 		err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3607 		if (err)
3608 			goto out;
3609 
3610 		flags &= ~BRIDGE_FLAGS_MASTER;
3611 	}
3612 
3613 	if ((flags & BRIDGE_FLAGS_SELF)) {
3614 		if (!dev->netdev_ops->ndo_bridge_dellink)
3615 			err = -EOPNOTSUPP;
3616 		else
3617 			err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3618 								  flags);
3619 
3620 		if (!err) {
3621 			flags &= ~BRIDGE_FLAGS_SELF;
3622 
3623 			/* Generate event to notify upper layer of bridge
3624 			 * change
3625 			 */
3626 			err = rtnl_bridge_notify(dev);
3627 		}
3628 	}
3629 
3630 	if (have_flags)
3631 		memcpy(nla_data(attr), &flags, sizeof(flags));
3632 out:
3633 	return err;
3634 }
3635 
3636 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
3637 {
3638 	return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
3639 	       (!idxattr || idxattr == attrid);
3640 }
3641 
3642 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
3643 static int rtnl_get_offload_stats_attr_size(int attr_id)
3644 {
3645 	switch (attr_id) {
3646 	case IFLA_OFFLOAD_XSTATS_CPU_HIT:
3647 		return sizeof(struct rtnl_link_stats64);
3648 	}
3649 
3650 	return 0;
3651 }
3652 
3653 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
3654 				  int *prividx)
3655 {
3656 	struct nlattr *attr = NULL;
3657 	int attr_id, size;
3658 	void *attr_data;
3659 	int err;
3660 
3661 	if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3662 	      dev->netdev_ops->ndo_get_offload_stats))
3663 		return -ENODATA;
3664 
3665 	for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3666 	     attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3667 		if (attr_id < *prividx)
3668 			continue;
3669 
3670 		size = rtnl_get_offload_stats_attr_size(attr_id);
3671 		if (!size)
3672 			continue;
3673 
3674 		if (!dev->netdev_ops->ndo_has_offload_stats(attr_id))
3675 			continue;
3676 
3677 		attr = nla_reserve_64bit(skb, attr_id, size,
3678 					 IFLA_OFFLOAD_XSTATS_UNSPEC);
3679 		if (!attr)
3680 			goto nla_put_failure;
3681 
3682 		attr_data = nla_data(attr);
3683 		memset(attr_data, 0, size);
3684 		err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
3685 							     attr_data);
3686 		if (err)
3687 			goto get_offload_stats_failure;
3688 	}
3689 
3690 	if (!attr)
3691 		return -ENODATA;
3692 
3693 	*prividx = 0;
3694 	return 0;
3695 
3696 nla_put_failure:
3697 	err = -EMSGSIZE;
3698 get_offload_stats_failure:
3699 	*prividx = attr_id;
3700 	return err;
3701 }
3702 
3703 static int rtnl_get_offload_stats_size(const struct net_device *dev)
3704 {
3705 	int nla_size = 0;
3706 	int attr_id;
3707 	int size;
3708 
3709 	if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3710 	      dev->netdev_ops->ndo_get_offload_stats))
3711 		return 0;
3712 
3713 	for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3714 	     attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3715 		if (!dev->netdev_ops->ndo_has_offload_stats(attr_id))
3716 			continue;
3717 		size = rtnl_get_offload_stats_attr_size(attr_id);
3718 		nla_size += nla_total_size_64bit(size);
3719 	}
3720 
3721 	if (nla_size != 0)
3722 		nla_size += nla_total_size(0);
3723 
3724 	return nla_size;
3725 }
3726 
3727 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
3728 			       int type, u32 pid, u32 seq, u32 change,
3729 			       unsigned int flags, unsigned int filter_mask,
3730 			       int *idxattr, int *prividx)
3731 {
3732 	struct if_stats_msg *ifsm;
3733 	struct nlmsghdr *nlh;
3734 	struct nlattr *attr;
3735 	int s_prividx = *prividx;
3736 	int err;
3737 
3738 	ASSERT_RTNL();
3739 
3740 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
3741 	if (!nlh)
3742 		return -EMSGSIZE;
3743 
3744 	ifsm = nlmsg_data(nlh);
3745 	ifsm->ifindex = dev->ifindex;
3746 	ifsm->filter_mask = filter_mask;
3747 
3748 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
3749 		struct rtnl_link_stats64 *sp;
3750 
3751 		attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
3752 					 sizeof(struct rtnl_link_stats64),
3753 					 IFLA_STATS_UNSPEC);
3754 		if (!attr)
3755 			goto nla_put_failure;
3756 
3757 		sp = nla_data(attr);
3758 		dev_get_stats(dev, sp);
3759 	}
3760 
3761 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
3762 		const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3763 
3764 		if (ops && ops->fill_linkxstats) {
3765 			*idxattr = IFLA_STATS_LINK_XSTATS;
3766 			attr = nla_nest_start(skb,
3767 					      IFLA_STATS_LINK_XSTATS);
3768 			if (!attr)
3769 				goto nla_put_failure;
3770 
3771 			err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3772 			nla_nest_end(skb, attr);
3773 			if (err)
3774 				goto nla_put_failure;
3775 			*idxattr = 0;
3776 		}
3777 	}
3778 
3779 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
3780 			     *idxattr)) {
3781 		const struct rtnl_link_ops *ops = NULL;
3782 		const struct net_device *master;
3783 
3784 		master = netdev_master_upper_dev_get(dev);
3785 		if (master)
3786 			ops = master->rtnl_link_ops;
3787 		if (ops && ops->fill_linkxstats) {
3788 			*idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
3789 			attr = nla_nest_start(skb,
3790 					      IFLA_STATS_LINK_XSTATS_SLAVE);
3791 			if (!attr)
3792 				goto nla_put_failure;
3793 
3794 			err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
3795 			nla_nest_end(skb, attr);
3796 			if (err)
3797 				goto nla_put_failure;
3798 			*idxattr = 0;
3799 		}
3800 	}
3801 
3802 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
3803 			     *idxattr)) {
3804 		*idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
3805 		attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
3806 		if (!attr)
3807 			goto nla_put_failure;
3808 
3809 		err = rtnl_get_offload_stats(skb, dev, prividx);
3810 		if (err == -ENODATA)
3811 			nla_nest_cancel(skb, attr);
3812 		else
3813 			nla_nest_end(skb, attr);
3814 
3815 		if (err && err != -ENODATA)
3816 			goto nla_put_failure;
3817 		*idxattr = 0;
3818 	}
3819 
3820 	nlmsg_end(skb, nlh);
3821 
3822 	return 0;
3823 
3824 nla_put_failure:
3825 	/* not a multi message or no progress mean a real error */
3826 	if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
3827 		nlmsg_cancel(skb, nlh);
3828 	else
3829 		nlmsg_end(skb, nlh);
3830 
3831 	return -EMSGSIZE;
3832 }
3833 
3834 static size_t if_nlmsg_stats_size(const struct net_device *dev,
3835 				  u32 filter_mask)
3836 {
3837 	size_t size = 0;
3838 
3839 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
3840 		size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
3841 
3842 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
3843 		const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
3844 		int attr = IFLA_STATS_LINK_XSTATS;
3845 
3846 		if (ops && ops->get_linkxstats_size) {
3847 			size += nla_total_size(ops->get_linkxstats_size(dev,
3848 									attr));
3849 			/* for IFLA_STATS_LINK_XSTATS */
3850 			size += nla_total_size(0);
3851 		}
3852 	}
3853 
3854 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
3855 		struct net_device *_dev = (struct net_device *)dev;
3856 		const struct rtnl_link_ops *ops = NULL;
3857 		const struct net_device *master;
3858 
3859 		/* netdev_master_upper_dev_get can't take const */
3860 		master = netdev_master_upper_dev_get(_dev);
3861 		if (master)
3862 			ops = master->rtnl_link_ops;
3863 		if (ops && ops->get_linkxstats_size) {
3864 			int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
3865 
3866 			size += nla_total_size(ops->get_linkxstats_size(dev,
3867 									attr));
3868 			/* for IFLA_STATS_LINK_XSTATS_SLAVE */
3869 			size += nla_total_size(0);
3870 		}
3871 	}
3872 
3873 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
3874 		size += rtnl_get_offload_stats_size(dev);
3875 
3876 	return size;
3877 }
3878 
3879 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh)
3880 {
3881 	struct net *net = sock_net(skb->sk);
3882 	struct net_device *dev = NULL;
3883 	int idxattr = 0, prividx = 0;
3884 	struct if_stats_msg *ifsm;
3885 	struct sk_buff *nskb;
3886 	u32 filter_mask;
3887 	int err;
3888 
3889 	ifsm = nlmsg_data(nlh);
3890 	if (ifsm->ifindex > 0)
3891 		dev = __dev_get_by_index(net, ifsm->ifindex);
3892 	else
3893 		return -EINVAL;
3894 
3895 	if (!dev)
3896 		return -ENODEV;
3897 
3898 	filter_mask = ifsm->filter_mask;
3899 	if (!filter_mask)
3900 		return -EINVAL;
3901 
3902 	nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
3903 	if (!nskb)
3904 		return -ENOBUFS;
3905 
3906 	err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
3907 				  NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
3908 				  0, filter_mask, &idxattr, &prividx);
3909 	if (err < 0) {
3910 		/* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
3911 		WARN_ON(err == -EMSGSIZE);
3912 		kfree_skb(nskb);
3913 	} else {
3914 		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3915 	}
3916 
3917 	return err;
3918 }
3919 
3920 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
3921 {
3922 	int h, s_h, err, s_idx, s_idxattr, s_prividx;
3923 	struct net *net = sock_net(skb->sk);
3924 	unsigned int flags = NLM_F_MULTI;
3925 	struct if_stats_msg *ifsm;
3926 	struct hlist_head *head;
3927 	struct net_device *dev;
3928 	u32 filter_mask = 0;
3929 	int idx = 0;
3930 
3931 	s_h = cb->args[0];
3932 	s_idx = cb->args[1];
3933 	s_idxattr = cb->args[2];
3934 	s_prividx = cb->args[3];
3935 
3936 	cb->seq = net->dev_base_seq;
3937 
3938 	ifsm = nlmsg_data(cb->nlh);
3939 	filter_mask = ifsm->filter_mask;
3940 	if (!filter_mask)
3941 		return -EINVAL;
3942 
3943 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3944 		idx = 0;
3945 		head = &net->dev_index_head[h];
3946 		hlist_for_each_entry(dev, head, index_hlist) {
3947 			if (idx < s_idx)
3948 				goto cont;
3949 			err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
3950 						  NETLINK_CB(cb->skb).portid,
3951 						  cb->nlh->nlmsg_seq, 0,
3952 						  flags, filter_mask,
3953 						  &s_idxattr, &s_prividx);
3954 			/* If we ran out of room on the first message,
3955 			 * we're in trouble
3956 			 */
3957 			WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
3958 
3959 			if (err < 0)
3960 				goto out;
3961 			s_prividx = 0;
3962 			s_idxattr = 0;
3963 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3964 cont:
3965 			idx++;
3966 		}
3967 	}
3968 out:
3969 	cb->args[3] = s_prividx;
3970 	cb->args[2] = s_idxattr;
3971 	cb->args[1] = idx;
3972 	cb->args[0] = h;
3973 
3974 	return skb->len;
3975 }
3976 
3977 /* Process one rtnetlink message. */
3978 
3979 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3980 {
3981 	struct net *net = sock_net(skb->sk);
3982 	rtnl_doit_func doit;
3983 	int kind;
3984 	int family;
3985 	int type;
3986 	int err;
3987 
3988 	type = nlh->nlmsg_type;
3989 	if (type > RTM_MAX)
3990 		return -EOPNOTSUPP;
3991 
3992 	type -= RTM_BASE;
3993 
3994 	/* All the messages must have at least 1 byte length */
3995 	if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3996 		return 0;
3997 
3998 	family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3999 	kind = type&3;
4000 
4001 	if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
4002 		return -EPERM;
4003 
4004 	if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
4005 		struct sock *rtnl;
4006 		rtnl_dumpit_func dumpit;
4007 		rtnl_calcit_func calcit;
4008 		u16 min_dump_alloc = 0;
4009 
4010 		dumpit = rtnl_get_dumpit(family, type);
4011 		if (dumpit == NULL)
4012 			return -EOPNOTSUPP;
4013 		calcit = rtnl_get_calcit(family, type);
4014 		if (calcit)
4015 			min_dump_alloc = calcit(skb, nlh);
4016 
4017 		__rtnl_unlock();
4018 		rtnl = net->rtnl;
4019 		{
4020 			struct netlink_dump_control c = {
4021 				.dump		= dumpit,
4022 				.min_dump_alloc	= min_dump_alloc,
4023 			};
4024 			err = netlink_dump_start(rtnl, skb, nlh, &c);
4025 		}
4026 		rtnl_lock();
4027 		return err;
4028 	}
4029 
4030 	doit = rtnl_get_doit(family, type);
4031 	if (doit == NULL)
4032 		return -EOPNOTSUPP;
4033 
4034 	return doit(skb, nlh);
4035 }
4036 
4037 static void rtnetlink_rcv(struct sk_buff *skb)
4038 {
4039 	rtnl_lock();
4040 	netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
4041 	rtnl_unlock();
4042 }
4043 
4044 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
4045 {
4046 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4047 
4048 	switch (event) {
4049 	case NETDEV_UP:
4050 	case NETDEV_DOWN:
4051 	case NETDEV_PRE_UP:
4052 	case NETDEV_POST_INIT:
4053 	case NETDEV_REGISTER:
4054 	case NETDEV_CHANGE:
4055 	case NETDEV_PRE_TYPE_CHANGE:
4056 	case NETDEV_GOING_DOWN:
4057 	case NETDEV_UNREGISTER:
4058 	case NETDEV_UNREGISTER_FINAL:
4059 	case NETDEV_RELEASE:
4060 	case NETDEV_JOIN:
4061 	case NETDEV_BONDING_INFO:
4062 		break;
4063 	default:
4064 		rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
4065 		break;
4066 	}
4067 	return NOTIFY_DONE;
4068 }
4069 
4070 static struct notifier_block rtnetlink_dev_notifier = {
4071 	.notifier_call	= rtnetlink_event,
4072 };
4073 
4074 
4075 static int __net_init rtnetlink_net_init(struct net *net)
4076 {
4077 	struct sock *sk;
4078 	struct netlink_kernel_cfg cfg = {
4079 		.groups		= RTNLGRP_MAX,
4080 		.input		= rtnetlink_rcv,
4081 		.cb_mutex	= &rtnl_mutex,
4082 		.flags		= NL_CFG_F_NONROOT_RECV,
4083 	};
4084 
4085 	sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
4086 	if (!sk)
4087 		return -ENOMEM;
4088 	net->rtnl = sk;
4089 	return 0;
4090 }
4091 
4092 static void __net_exit rtnetlink_net_exit(struct net *net)
4093 {
4094 	netlink_kernel_release(net->rtnl);
4095 	net->rtnl = NULL;
4096 }
4097 
4098 static struct pernet_operations rtnetlink_net_ops = {
4099 	.init = rtnetlink_net_init,
4100 	.exit = rtnetlink_net_exit,
4101 };
4102 
4103 void __init rtnetlink_init(void)
4104 {
4105 	if (register_pernet_subsys(&rtnetlink_net_ops))
4106 		panic("rtnetlink_init: cannot initialize rtnetlink\n");
4107 
4108 	register_netdevice_notifier(&rtnetlink_dev_notifier);
4109 
4110 	rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
4111 		      rtnl_dump_ifinfo, rtnl_calcit);
4112 	rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
4113 	rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
4114 	rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
4115 
4116 	rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
4117 	rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
4118 
4119 	rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
4120 	rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
4121 	rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
4122 
4123 	rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
4124 	rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
4125 	rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
4126 
4127 	rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
4128 		      NULL);
4129 }
4130