1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * INET		An implementation of the TCP/IP protocol suite for the LINUX
4  *		operating system.  INET is implemented using the  BSD Socket
5  *		interface as the means of communication with the user level.
6  *
7  *		Routing netlink socket interface: protocol independent part.
8  *
9  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10  *
11  *	Fixes:
12  *	Vitaly E. Lavrov		RTA_OK arithmetic was wrong.
13  */
14 
15 #include <linux/bitops.h>
16 #include <linux/errno.h>
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/socket.h>
20 #include <linux/kernel.h>
21 #include <linux/timer.h>
22 #include <linux/string.h>
23 #include <linux/sockios.h>
24 #include <linux/net.h>
25 #include <linux/fcntl.h>
26 #include <linux/mm.h>
27 #include <linux/slab.h>
28 #include <linux/interrupt.h>
29 #include <linux/capability.h>
30 #include <linux/skbuff.h>
31 #include <linux/init.h>
32 #include <linux/security.h>
33 #include <linux/mutex.h>
34 #include <linux/if_addr.h>
35 #include <linux/if_bridge.h>
36 #include <linux/if_vlan.h>
37 #include <linux/pci.h>
38 #include <linux/etherdevice.h>
39 #include <linux/bpf.h>
40 
41 #include <linux/uaccess.h>
42 
43 #include <linux/inet.h>
44 #include <linux/netdevice.h>
45 #include <net/ip.h>
46 #include <net/protocol.h>
47 #include <net/arp.h>
48 #include <net/route.h>
49 #include <net/udp.h>
50 #include <net/tcp.h>
51 #include <net/sock.h>
52 #include <net/pkt_sched.h>
53 #include <net/fib_rules.h>
54 #include <net/rtnetlink.h>
55 #include <net/net_namespace.h>
56 
57 #include "dev.h"
58 
59 #define RTNL_MAX_TYPE		50
60 #define RTNL_SLAVE_MAX_TYPE	40
61 
62 struct rtnl_link {
63 	rtnl_doit_func		doit;
64 	rtnl_dumpit_func	dumpit;
65 	struct module		*owner;
66 	unsigned int		flags;
67 	struct rcu_head		rcu;
68 };
69 
70 static DEFINE_MUTEX(rtnl_mutex);
71 
rtnl_lock(void)72 void rtnl_lock(void)
73 {
74 	mutex_lock(&rtnl_mutex);
75 }
76 EXPORT_SYMBOL(rtnl_lock);
77 
rtnl_lock_killable(void)78 int rtnl_lock_killable(void)
79 {
80 	return mutex_lock_killable(&rtnl_mutex);
81 }
82 EXPORT_SYMBOL(rtnl_lock_killable);
83 
84 static struct sk_buff *defer_kfree_skb_list;
rtnl_kfree_skbs(struct sk_buff * head,struct sk_buff * tail)85 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
86 {
87 	if (head && tail) {
88 		tail->next = defer_kfree_skb_list;
89 		defer_kfree_skb_list = head;
90 	}
91 }
92 EXPORT_SYMBOL(rtnl_kfree_skbs);
93 
__rtnl_unlock(void)94 void __rtnl_unlock(void)
95 {
96 	struct sk_buff *head = defer_kfree_skb_list;
97 
98 	defer_kfree_skb_list = NULL;
99 
100 	/* Ensure that we didn't actually add any TODO item when __rtnl_unlock()
101 	 * is used. In some places, e.g. in cfg80211, we have code that will do
102 	 * something like
103 	 *   rtnl_lock()
104 	 *   wiphy_lock()
105 	 *   ...
106 	 *   rtnl_unlock()
107 	 *
108 	 * and because netdev_run_todo() acquires the RTNL for items on the list
109 	 * we could cause a situation such as this:
110 	 * Thread 1			Thread 2
111 	 *				  rtnl_lock()
112 	 *				  unregister_netdevice()
113 	 *				  __rtnl_unlock()
114 	 * rtnl_lock()
115 	 * wiphy_lock()
116 	 * rtnl_unlock()
117 	 *   netdev_run_todo()
118 	 *     __rtnl_unlock()
119 	 *
120 	 *     // list not empty now
121 	 *     // because of thread 2
122 	 *				  rtnl_lock()
123 	 *     while (!list_empty(...))
124 	 *       rtnl_lock()
125 	 *				  wiphy_lock()
126 	 * **** DEADLOCK ****
127 	 *
128 	 * However, usage of __rtnl_unlock() is rare, and so we can ensure that
129 	 * it's not used in cases where something is added to do the list.
130 	 */
131 	WARN_ON(!list_empty(&net_todo_list));
132 
133 	mutex_unlock(&rtnl_mutex);
134 
135 	while (head) {
136 		struct sk_buff *next = head->next;
137 
138 		kfree_skb(head);
139 		cond_resched();
140 		head = next;
141 	}
142 }
143 
rtnl_unlock(void)144 void rtnl_unlock(void)
145 {
146 	/* This fellow will unlock it for us. */
147 	netdev_run_todo();
148 }
149 EXPORT_SYMBOL(rtnl_unlock);
150 
rtnl_trylock(void)151 int rtnl_trylock(void)
152 {
153 	return mutex_trylock(&rtnl_mutex);
154 }
155 EXPORT_SYMBOL(rtnl_trylock);
156 
rtnl_is_locked(void)157 int rtnl_is_locked(void)
158 {
159 	return mutex_is_locked(&rtnl_mutex);
160 }
161 EXPORT_SYMBOL(rtnl_is_locked);
162 
refcount_dec_and_rtnl_lock(refcount_t * r)163 bool refcount_dec_and_rtnl_lock(refcount_t *r)
164 {
165 	return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
166 }
167 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
168 
169 #ifdef CONFIG_PROVE_LOCKING
lockdep_rtnl_is_held(void)170 bool lockdep_rtnl_is_held(void)
171 {
172 	return lockdep_is_held(&rtnl_mutex);
173 }
174 EXPORT_SYMBOL(lockdep_rtnl_is_held);
175 #endif /* #ifdef CONFIG_PROVE_LOCKING */
176 
177 static struct rtnl_link __rcu *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
178 
rtm_msgindex(int msgtype)179 static inline int rtm_msgindex(int msgtype)
180 {
181 	int msgindex = msgtype - RTM_BASE;
182 
183 	/*
184 	 * msgindex < 0 implies someone tried to register a netlink
185 	 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
186 	 * the message type has not been added to linux/rtnetlink.h
187 	 */
188 	BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
189 
190 	return msgindex;
191 }
192 
rtnl_get_link(int protocol,int msgtype)193 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
194 {
195 	struct rtnl_link __rcu **tab;
196 
197 	if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
198 		protocol = PF_UNSPEC;
199 
200 	tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
201 	if (!tab)
202 		tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
203 
204 	return rcu_dereference_rtnl(tab[msgtype]);
205 }
206 
rtnl_register_internal(struct module * owner,int protocol,int msgtype,rtnl_doit_func doit,rtnl_dumpit_func dumpit,unsigned int flags)207 static int rtnl_register_internal(struct module *owner,
208 				  int protocol, int msgtype,
209 				  rtnl_doit_func doit, rtnl_dumpit_func dumpit,
210 				  unsigned int flags)
211 {
212 	struct rtnl_link *link, *old;
213 	struct rtnl_link __rcu **tab;
214 	int msgindex;
215 	int ret = -ENOBUFS;
216 
217 	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
218 	msgindex = rtm_msgindex(msgtype);
219 
220 	rtnl_lock();
221 	tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
222 	if (tab == NULL) {
223 		tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
224 		if (!tab)
225 			goto unlock;
226 
227 		/* ensures we see the 0 stores */
228 		rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
229 	}
230 
231 	old = rtnl_dereference(tab[msgindex]);
232 	if (old) {
233 		link = kmemdup(old, sizeof(*old), GFP_KERNEL);
234 		if (!link)
235 			goto unlock;
236 	} else {
237 		link = kzalloc(sizeof(*link), GFP_KERNEL);
238 		if (!link)
239 			goto unlock;
240 	}
241 
242 	WARN_ON(link->owner && link->owner != owner);
243 	link->owner = owner;
244 
245 	WARN_ON(doit && link->doit && link->doit != doit);
246 	if (doit)
247 		link->doit = doit;
248 	WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
249 	if (dumpit)
250 		link->dumpit = dumpit;
251 
252 	WARN_ON(rtnl_msgtype_kind(msgtype) != RTNL_KIND_DEL &&
253 		(flags & RTNL_FLAG_BULK_DEL_SUPPORTED));
254 	link->flags |= flags;
255 
256 	/* publish protocol:msgtype */
257 	rcu_assign_pointer(tab[msgindex], link);
258 	ret = 0;
259 	if (old)
260 		kfree_rcu(old, rcu);
261 unlock:
262 	rtnl_unlock();
263 	return ret;
264 }
265 
266 /**
267  * rtnl_register_module - Register a rtnetlink message type
268  *
269  * @owner: module registering the hook (THIS_MODULE)
270  * @protocol: Protocol family or PF_UNSPEC
271  * @msgtype: rtnetlink message type
272  * @doit: Function pointer called for each request message
273  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
274  * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
275  *
276  * Like rtnl_register, but for use by removable modules.
277  */
rtnl_register_module(struct module * owner,int protocol,int msgtype,rtnl_doit_func doit,rtnl_dumpit_func dumpit,unsigned int flags)278 int rtnl_register_module(struct module *owner,
279 			 int protocol, int msgtype,
280 			 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
281 			 unsigned int flags)
282 {
283 	return rtnl_register_internal(owner, protocol, msgtype,
284 				      doit, dumpit, flags);
285 }
286 EXPORT_SYMBOL_GPL(rtnl_register_module);
287 
288 /**
289  * rtnl_register - Register a rtnetlink message type
290  * @protocol: Protocol family or PF_UNSPEC
291  * @msgtype: rtnetlink message type
292  * @doit: Function pointer called for each request message
293  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
294  * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
295  *
296  * Registers the specified function pointers (at least one of them has
297  * to be non-NULL) to be called whenever a request message for the
298  * specified protocol family and message type is received.
299  *
300  * The special protocol family PF_UNSPEC may be used to define fallback
301  * function pointers for the case when no entry for the specific protocol
302  * family exists.
303  */
rtnl_register(int protocol,int msgtype,rtnl_doit_func doit,rtnl_dumpit_func dumpit,unsigned int flags)304 void rtnl_register(int protocol, int msgtype,
305 		   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
306 		   unsigned int flags)
307 {
308 	int err;
309 
310 	err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
311 				     flags);
312 	if (err)
313 		pr_err("Unable to register rtnetlink message handler, "
314 		       "protocol = %d, message type = %d\n", protocol, msgtype);
315 }
316 
317 /**
318  * rtnl_unregister - Unregister a rtnetlink message type
319  * @protocol: Protocol family or PF_UNSPEC
320  * @msgtype: rtnetlink message type
321  *
322  * Returns 0 on success or a negative error code.
323  */
rtnl_unregister(int protocol,int msgtype)324 int rtnl_unregister(int protocol, int msgtype)
325 {
326 	struct rtnl_link __rcu **tab;
327 	struct rtnl_link *link;
328 	int msgindex;
329 
330 	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
331 	msgindex = rtm_msgindex(msgtype);
332 
333 	rtnl_lock();
334 	tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
335 	if (!tab) {
336 		rtnl_unlock();
337 		return -ENOENT;
338 	}
339 
340 	link = rtnl_dereference(tab[msgindex]);
341 	RCU_INIT_POINTER(tab[msgindex], NULL);
342 	rtnl_unlock();
343 
344 	kfree_rcu(link, rcu);
345 
346 	return 0;
347 }
348 EXPORT_SYMBOL_GPL(rtnl_unregister);
349 
350 /**
351  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
352  * @protocol : Protocol family or PF_UNSPEC
353  *
354  * Identical to calling rtnl_unregster() for all registered message types
355  * of a certain protocol family.
356  */
rtnl_unregister_all(int protocol)357 void rtnl_unregister_all(int protocol)
358 {
359 	struct rtnl_link __rcu **tab;
360 	struct rtnl_link *link;
361 	int msgindex;
362 
363 	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
364 
365 	rtnl_lock();
366 	tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
367 	if (!tab) {
368 		rtnl_unlock();
369 		return;
370 	}
371 	RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
372 	for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
373 		link = rtnl_dereference(tab[msgindex]);
374 		if (!link)
375 			continue;
376 
377 		RCU_INIT_POINTER(tab[msgindex], NULL);
378 		kfree_rcu(link, rcu);
379 	}
380 	rtnl_unlock();
381 
382 	synchronize_net();
383 
384 	kfree(tab);
385 }
386 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
387 
388 static LIST_HEAD(link_ops);
389 
rtnl_link_ops_get(const char * kind)390 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
391 {
392 	const struct rtnl_link_ops *ops;
393 
394 	list_for_each_entry(ops, &link_ops, list) {
395 		if (!strcmp(ops->kind, kind))
396 			return ops;
397 	}
398 	return NULL;
399 }
400 
401 /**
402  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
403  * @ops: struct rtnl_link_ops * to register
404  *
405  * The caller must hold the rtnl_mutex. This function should be used
406  * by drivers that create devices during module initialization. It
407  * must be called before registering the devices.
408  *
409  * Returns 0 on success or a negative error code.
410  */
__rtnl_link_register(struct rtnl_link_ops * ops)411 int __rtnl_link_register(struct rtnl_link_ops *ops)
412 {
413 	if (rtnl_link_ops_get(ops->kind))
414 		return -EEXIST;
415 
416 	/* The check for alloc/setup is here because if ops
417 	 * does not have that filled up, it is not possible
418 	 * to use the ops for creating device. So do not
419 	 * fill up dellink as well. That disables rtnl_dellink.
420 	 */
421 	if ((ops->alloc || ops->setup) && !ops->dellink)
422 		ops->dellink = unregister_netdevice_queue;
423 
424 	list_add_tail(&ops->list, &link_ops);
425 	return 0;
426 }
427 EXPORT_SYMBOL_GPL(__rtnl_link_register);
428 
429 /**
430  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
431  * @ops: struct rtnl_link_ops * to register
432  *
433  * Returns 0 on success or a negative error code.
434  */
rtnl_link_register(struct rtnl_link_ops * ops)435 int rtnl_link_register(struct rtnl_link_ops *ops)
436 {
437 	int err;
438 
439 	/* Sanity-check max sizes to avoid stack buffer overflow. */
440 	if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
441 		    ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
442 		return -EINVAL;
443 
444 	rtnl_lock();
445 	err = __rtnl_link_register(ops);
446 	rtnl_unlock();
447 	return err;
448 }
449 EXPORT_SYMBOL_GPL(rtnl_link_register);
450 
__rtnl_kill_links(struct net * net,struct rtnl_link_ops * ops)451 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
452 {
453 	struct net_device *dev;
454 	LIST_HEAD(list_kill);
455 
456 	for_each_netdev(net, dev) {
457 		if (dev->rtnl_link_ops == ops)
458 			ops->dellink(dev, &list_kill);
459 	}
460 	unregister_netdevice_many(&list_kill);
461 }
462 
463 /**
464  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
465  * @ops: struct rtnl_link_ops * to unregister
466  *
467  * The caller must hold the rtnl_mutex and guarantee net_namespace_list
468  * integrity (hold pernet_ops_rwsem for writing to close the race
469  * with setup_net() and cleanup_net()).
470  */
__rtnl_link_unregister(struct rtnl_link_ops * ops)471 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
472 {
473 	struct net *net;
474 
475 	for_each_net(net) {
476 		__rtnl_kill_links(net, ops);
477 	}
478 	list_del(&ops->list);
479 }
480 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
481 
482 /* Return with the rtnl_lock held when there are no network
483  * devices unregistering in any network namespace.
484  */
rtnl_lock_unregistering_all(void)485 static void rtnl_lock_unregistering_all(void)
486 {
487 	struct net *net;
488 	bool unregistering;
489 	DEFINE_WAIT_FUNC(wait, woken_wake_function);
490 
491 	add_wait_queue(&netdev_unregistering_wq, &wait);
492 	for (;;) {
493 		unregistering = false;
494 		rtnl_lock();
495 		/* We held write locked pernet_ops_rwsem, and parallel
496 		 * setup_net() and cleanup_net() are not possible.
497 		 */
498 		for_each_net(net) {
499 			if (atomic_read(&net->dev_unreg_count) > 0) {
500 				unregistering = true;
501 				break;
502 			}
503 		}
504 		if (!unregistering)
505 			break;
506 		__rtnl_unlock();
507 
508 		wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
509 	}
510 	remove_wait_queue(&netdev_unregistering_wq, &wait);
511 }
512 
513 /**
514  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
515  * @ops: struct rtnl_link_ops * to unregister
516  */
rtnl_link_unregister(struct rtnl_link_ops * ops)517 void rtnl_link_unregister(struct rtnl_link_ops *ops)
518 {
519 	/* Close the race with setup_net() and cleanup_net() */
520 	down_write(&pernet_ops_rwsem);
521 	rtnl_lock_unregistering_all();
522 	__rtnl_link_unregister(ops);
523 	rtnl_unlock();
524 	up_write(&pernet_ops_rwsem);
525 }
526 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
527 
rtnl_link_get_slave_info_data_size(const struct net_device * dev)528 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
529 {
530 	struct net_device *master_dev;
531 	const struct rtnl_link_ops *ops;
532 	size_t size = 0;
533 
534 	rcu_read_lock();
535 
536 	master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
537 	if (!master_dev)
538 		goto out;
539 
540 	ops = master_dev->rtnl_link_ops;
541 	if (!ops || !ops->get_slave_size)
542 		goto out;
543 	/* IFLA_INFO_SLAVE_DATA + nested data */
544 	size = nla_total_size(sizeof(struct nlattr)) +
545 	       ops->get_slave_size(master_dev, dev);
546 
547 out:
548 	rcu_read_unlock();
549 	return size;
550 }
551 
rtnl_link_get_size(const struct net_device * dev)552 static size_t rtnl_link_get_size(const struct net_device *dev)
553 {
554 	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
555 	size_t size;
556 
557 	if (!ops)
558 		return 0;
559 
560 	size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
561 	       nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
562 
563 	if (ops->get_size)
564 		/* IFLA_INFO_DATA + nested data */
565 		size += nla_total_size(sizeof(struct nlattr)) +
566 			ops->get_size(dev);
567 
568 	if (ops->get_xstats_size)
569 		/* IFLA_INFO_XSTATS */
570 		size += nla_total_size(ops->get_xstats_size(dev));
571 
572 	size += rtnl_link_get_slave_info_data_size(dev);
573 
574 	return size;
575 }
576 
577 static LIST_HEAD(rtnl_af_ops);
578 
rtnl_af_lookup(const int family)579 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
580 {
581 	const struct rtnl_af_ops *ops;
582 
583 	ASSERT_RTNL();
584 
585 	list_for_each_entry(ops, &rtnl_af_ops, list) {
586 		if (ops->family == family)
587 			return ops;
588 	}
589 
590 	return NULL;
591 }
592 
593 /**
594  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
595  * @ops: struct rtnl_af_ops * to register
596  *
597  * Returns 0 on success or a negative error code.
598  */
rtnl_af_register(struct rtnl_af_ops * ops)599 void rtnl_af_register(struct rtnl_af_ops *ops)
600 {
601 	rtnl_lock();
602 	list_add_tail_rcu(&ops->list, &rtnl_af_ops);
603 	rtnl_unlock();
604 }
605 EXPORT_SYMBOL_GPL(rtnl_af_register);
606 
607 /**
608  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
609  * @ops: struct rtnl_af_ops * to unregister
610  */
rtnl_af_unregister(struct rtnl_af_ops * ops)611 void rtnl_af_unregister(struct rtnl_af_ops *ops)
612 {
613 	rtnl_lock();
614 	list_del_rcu(&ops->list);
615 	rtnl_unlock();
616 
617 	synchronize_rcu();
618 }
619 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
620 
rtnl_link_get_af_size(const struct net_device * dev,u32 ext_filter_mask)621 static size_t rtnl_link_get_af_size(const struct net_device *dev,
622 				    u32 ext_filter_mask)
623 {
624 	struct rtnl_af_ops *af_ops;
625 	size_t size;
626 
627 	/* IFLA_AF_SPEC */
628 	size = nla_total_size(sizeof(struct nlattr));
629 
630 	rcu_read_lock();
631 	list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
632 		if (af_ops->get_link_af_size) {
633 			/* AF_* + nested data */
634 			size += nla_total_size(sizeof(struct nlattr)) +
635 				af_ops->get_link_af_size(dev, ext_filter_mask);
636 		}
637 	}
638 	rcu_read_unlock();
639 
640 	return size;
641 }
642 
rtnl_have_link_slave_info(const struct net_device * dev)643 static bool rtnl_have_link_slave_info(const struct net_device *dev)
644 {
645 	struct net_device *master_dev;
646 	bool ret = false;
647 
648 	rcu_read_lock();
649 
650 	master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
651 	if (master_dev && master_dev->rtnl_link_ops)
652 		ret = true;
653 	rcu_read_unlock();
654 	return ret;
655 }
656 
rtnl_link_slave_info_fill(struct sk_buff * skb,const struct net_device * dev)657 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
658 				     const struct net_device *dev)
659 {
660 	struct net_device *master_dev;
661 	const struct rtnl_link_ops *ops;
662 	struct nlattr *slave_data;
663 	int err;
664 
665 	master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
666 	if (!master_dev)
667 		return 0;
668 	ops = master_dev->rtnl_link_ops;
669 	if (!ops)
670 		return 0;
671 	if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
672 		return -EMSGSIZE;
673 	if (ops->fill_slave_info) {
674 		slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA);
675 		if (!slave_data)
676 			return -EMSGSIZE;
677 		err = ops->fill_slave_info(skb, master_dev, dev);
678 		if (err < 0)
679 			goto err_cancel_slave_data;
680 		nla_nest_end(skb, slave_data);
681 	}
682 	return 0;
683 
684 err_cancel_slave_data:
685 	nla_nest_cancel(skb, slave_data);
686 	return err;
687 }
688 
rtnl_link_info_fill(struct sk_buff * skb,const struct net_device * dev)689 static int rtnl_link_info_fill(struct sk_buff *skb,
690 			       const struct net_device *dev)
691 {
692 	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
693 	struct nlattr *data;
694 	int err;
695 
696 	if (!ops)
697 		return 0;
698 	if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
699 		return -EMSGSIZE;
700 	if (ops->fill_xstats) {
701 		err = ops->fill_xstats(skb, dev);
702 		if (err < 0)
703 			return err;
704 	}
705 	if (ops->fill_info) {
706 		data = nla_nest_start_noflag(skb, IFLA_INFO_DATA);
707 		if (data == NULL)
708 			return -EMSGSIZE;
709 		err = ops->fill_info(skb, dev);
710 		if (err < 0)
711 			goto err_cancel_data;
712 		nla_nest_end(skb, data);
713 	}
714 	return 0;
715 
716 err_cancel_data:
717 	nla_nest_cancel(skb, data);
718 	return err;
719 }
720 
rtnl_link_fill(struct sk_buff * skb,const struct net_device * dev)721 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
722 {
723 	struct nlattr *linkinfo;
724 	int err = -EMSGSIZE;
725 
726 	linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO);
727 	if (linkinfo == NULL)
728 		goto out;
729 
730 	err = rtnl_link_info_fill(skb, dev);
731 	if (err < 0)
732 		goto err_cancel_link;
733 
734 	err = rtnl_link_slave_info_fill(skb, dev);
735 	if (err < 0)
736 		goto err_cancel_link;
737 
738 	nla_nest_end(skb, linkinfo);
739 	return 0;
740 
741 err_cancel_link:
742 	nla_nest_cancel(skb, linkinfo);
743 out:
744 	return err;
745 }
746 
rtnetlink_send(struct sk_buff * skb,struct net * net,u32 pid,unsigned int group,int echo)747 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
748 {
749 	struct sock *rtnl = net->rtnl;
750 
751 	return nlmsg_notify(rtnl, skb, pid, group, echo, GFP_KERNEL);
752 }
753 
rtnl_unicast(struct sk_buff * skb,struct net * net,u32 pid)754 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
755 {
756 	struct sock *rtnl = net->rtnl;
757 
758 	return nlmsg_unicast(rtnl, skb, pid);
759 }
760 EXPORT_SYMBOL(rtnl_unicast);
761 
rtnl_notify(struct sk_buff * skb,struct net * net,u32 pid,u32 group,struct nlmsghdr * nlh,gfp_t flags)762 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
763 		 struct nlmsghdr *nlh, gfp_t flags)
764 {
765 	struct sock *rtnl = net->rtnl;
766 
767 	nlmsg_notify(rtnl, skb, pid, group, nlmsg_report(nlh), flags);
768 }
769 EXPORT_SYMBOL(rtnl_notify);
770 
rtnl_set_sk_err(struct net * net,u32 group,int error)771 void rtnl_set_sk_err(struct net *net, u32 group, int error)
772 {
773 	struct sock *rtnl = net->rtnl;
774 
775 	netlink_set_err(rtnl, 0, group, error);
776 }
777 EXPORT_SYMBOL(rtnl_set_sk_err);
778 
rtnetlink_put_metrics(struct sk_buff * skb,u32 * metrics)779 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
780 {
781 	struct nlattr *mx;
782 	int i, valid = 0;
783 
784 	/* nothing is dumped for dst_default_metrics, so just skip the loop */
785 	if (metrics == dst_default_metrics.metrics)
786 		return 0;
787 
788 	mx = nla_nest_start_noflag(skb, RTA_METRICS);
789 	if (mx == NULL)
790 		return -ENOBUFS;
791 
792 	for (i = 0; i < RTAX_MAX; i++) {
793 		if (metrics[i]) {
794 			if (i == RTAX_CC_ALGO - 1) {
795 				char tmp[TCP_CA_NAME_MAX], *name;
796 
797 				name = tcp_ca_get_name_by_key(metrics[i], tmp);
798 				if (!name)
799 					continue;
800 				if (nla_put_string(skb, i + 1, name))
801 					goto nla_put_failure;
802 			} else if (i == RTAX_FEATURES - 1) {
803 				u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
804 
805 				if (!user_features)
806 					continue;
807 				BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
808 				if (nla_put_u32(skb, i + 1, user_features))
809 					goto nla_put_failure;
810 			} else {
811 				if (nla_put_u32(skb, i + 1, metrics[i]))
812 					goto nla_put_failure;
813 			}
814 			valid++;
815 		}
816 	}
817 
818 	if (!valid) {
819 		nla_nest_cancel(skb, mx);
820 		return 0;
821 	}
822 
823 	return nla_nest_end(skb, mx);
824 
825 nla_put_failure:
826 	nla_nest_cancel(skb, mx);
827 	return -EMSGSIZE;
828 }
829 EXPORT_SYMBOL(rtnetlink_put_metrics);
830 
rtnl_put_cacheinfo(struct sk_buff * skb,struct dst_entry * dst,u32 id,long expires,u32 error)831 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
832 		       long expires, u32 error)
833 {
834 	struct rta_cacheinfo ci = {
835 		.rta_error = error,
836 		.rta_id =  id,
837 	};
838 
839 	if (dst) {
840 		ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
841 		ci.rta_used = dst->__use;
842 		ci.rta_clntref = atomic_read(&dst->__refcnt);
843 	}
844 	if (expires) {
845 		unsigned long clock;
846 
847 		clock = jiffies_to_clock_t(abs(expires));
848 		clock = min_t(unsigned long, clock, INT_MAX);
849 		ci.rta_expires = (expires > 0) ? clock : -clock;
850 	}
851 	return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
852 }
853 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
854 
set_operstate(struct net_device * dev,unsigned char transition)855 static void set_operstate(struct net_device *dev, unsigned char transition)
856 {
857 	unsigned char operstate = dev->operstate;
858 
859 	switch (transition) {
860 	case IF_OPER_UP:
861 		if ((operstate == IF_OPER_DORMANT ||
862 		     operstate == IF_OPER_TESTING ||
863 		     operstate == IF_OPER_UNKNOWN) &&
864 		    !netif_dormant(dev) && !netif_testing(dev))
865 			operstate = IF_OPER_UP;
866 		break;
867 
868 	case IF_OPER_TESTING:
869 		if (operstate == IF_OPER_UP ||
870 		    operstate == IF_OPER_UNKNOWN)
871 			operstate = IF_OPER_TESTING;
872 		break;
873 
874 	case IF_OPER_DORMANT:
875 		if (operstate == IF_OPER_UP ||
876 		    operstate == IF_OPER_UNKNOWN)
877 			operstate = IF_OPER_DORMANT;
878 		break;
879 	}
880 
881 	if (dev->operstate != operstate) {
882 		write_lock(&dev_base_lock);
883 		dev->operstate = operstate;
884 		write_unlock(&dev_base_lock);
885 		netdev_state_change(dev);
886 	}
887 }
888 
rtnl_dev_get_flags(const struct net_device * dev)889 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
890 {
891 	return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
892 	       (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
893 }
894 
rtnl_dev_combine_flags(const struct net_device * dev,const struct ifinfomsg * ifm)895 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
896 					   const struct ifinfomsg *ifm)
897 {
898 	unsigned int flags = ifm->ifi_flags;
899 
900 	/* bugwards compatibility: ifi_change == 0 is treated as ~0 */
901 	if (ifm->ifi_change)
902 		flags = (flags & ifm->ifi_change) |
903 			(rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
904 
905 	return flags;
906 }
907 
copy_rtnl_link_stats(struct rtnl_link_stats * a,const struct rtnl_link_stats64 * b)908 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
909 				 const struct rtnl_link_stats64 *b)
910 {
911 	a->rx_packets = b->rx_packets;
912 	a->tx_packets = b->tx_packets;
913 	a->rx_bytes = b->rx_bytes;
914 	a->tx_bytes = b->tx_bytes;
915 	a->rx_errors = b->rx_errors;
916 	a->tx_errors = b->tx_errors;
917 	a->rx_dropped = b->rx_dropped;
918 	a->tx_dropped = b->tx_dropped;
919 
920 	a->multicast = b->multicast;
921 	a->collisions = b->collisions;
922 
923 	a->rx_length_errors = b->rx_length_errors;
924 	a->rx_over_errors = b->rx_over_errors;
925 	a->rx_crc_errors = b->rx_crc_errors;
926 	a->rx_frame_errors = b->rx_frame_errors;
927 	a->rx_fifo_errors = b->rx_fifo_errors;
928 	a->rx_missed_errors = b->rx_missed_errors;
929 
930 	a->tx_aborted_errors = b->tx_aborted_errors;
931 	a->tx_carrier_errors = b->tx_carrier_errors;
932 	a->tx_fifo_errors = b->tx_fifo_errors;
933 	a->tx_heartbeat_errors = b->tx_heartbeat_errors;
934 	a->tx_window_errors = b->tx_window_errors;
935 
936 	a->rx_compressed = b->rx_compressed;
937 	a->tx_compressed = b->tx_compressed;
938 
939 	a->rx_nohandler = b->rx_nohandler;
940 }
941 
942 /* All VF info */
rtnl_vfinfo_size(const struct net_device * dev,u32 ext_filter_mask)943 static inline int rtnl_vfinfo_size(const struct net_device *dev,
944 				   u32 ext_filter_mask)
945 {
946 	if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
947 		int num_vfs = dev_num_vf(dev->dev.parent);
948 		size_t size = nla_total_size(0);
949 		size += num_vfs *
950 			(nla_total_size(0) +
951 			 nla_total_size(sizeof(struct ifla_vf_mac)) +
952 			 nla_total_size(sizeof(struct ifla_vf_broadcast)) +
953 			 nla_total_size(sizeof(struct ifla_vf_vlan)) +
954 			 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
955 			 nla_total_size(MAX_VLAN_LIST_LEN *
956 					sizeof(struct ifla_vf_vlan_info)) +
957 			 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
958 			 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
959 			 nla_total_size(sizeof(struct ifla_vf_rate)) +
960 			 nla_total_size(sizeof(struct ifla_vf_link_state)) +
961 			 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
962 			 nla_total_size(0) + /* nest IFLA_VF_STATS */
963 			 /* IFLA_VF_STATS_RX_PACKETS */
964 			 nla_total_size_64bit(sizeof(__u64)) +
965 			 /* IFLA_VF_STATS_TX_PACKETS */
966 			 nla_total_size_64bit(sizeof(__u64)) +
967 			 /* IFLA_VF_STATS_RX_BYTES */
968 			 nla_total_size_64bit(sizeof(__u64)) +
969 			 /* IFLA_VF_STATS_TX_BYTES */
970 			 nla_total_size_64bit(sizeof(__u64)) +
971 			 /* IFLA_VF_STATS_BROADCAST */
972 			 nla_total_size_64bit(sizeof(__u64)) +
973 			 /* IFLA_VF_STATS_MULTICAST */
974 			 nla_total_size_64bit(sizeof(__u64)) +
975 			 /* IFLA_VF_STATS_RX_DROPPED */
976 			 nla_total_size_64bit(sizeof(__u64)) +
977 			 /* IFLA_VF_STATS_TX_DROPPED */
978 			 nla_total_size_64bit(sizeof(__u64)) +
979 			 nla_total_size(sizeof(struct ifla_vf_trust)));
980 		return size;
981 	} else
982 		return 0;
983 }
984 
rtnl_port_size(const struct net_device * dev,u32 ext_filter_mask)985 static size_t rtnl_port_size(const struct net_device *dev,
986 			     u32 ext_filter_mask)
987 {
988 	size_t port_size = nla_total_size(4)		/* PORT_VF */
989 		+ nla_total_size(PORT_PROFILE_MAX)	/* PORT_PROFILE */
990 		+ nla_total_size(PORT_UUID_MAX)		/* PORT_INSTANCE_UUID */
991 		+ nla_total_size(PORT_UUID_MAX)		/* PORT_HOST_UUID */
992 		+ nla_total_size(1)			/* PROT_VDP_REQUEST */
993 		+ nla_total_size(2);			/* PORT_VDP_RESPONSE */
994 	size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
995 	size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
996 		+ port_size;
997 	size_t port_self_size = nla_total_size(sizeof(struct nlattr))
998 		+ port_size;
999 
1000 	if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1001 	    !(ext_filter_mask & RTEXT_FILTER_VF))
1002 		return 0;
1003 	if (dev_num_vf(dev->dev.parent))
1004 		return port_self_size + vf_ports_size +
1005 			vf_port_size * dev_num_vf(dev->dev.parent);
1006 	else
1007 		return port_self_size;
1008 }
1009 
rtnl_xdp_size(void)1010 static size_t rtnl_xdp_size(void)
1011 {
1012 	size_t xdp_size = nla_total_size(0) +	/* nest IFLA_XDP */
1013 			  nla_total_size(1) +	/* XDP_ATTACHED */
1014 			  nla_total_size(4) +	/* XDP_PROG_ID (or 1st mode) */
1015 			  nla_total_size(4);	/* XDP_<mode>_PROG_ID */
1016 
1017 	return xdp_size;
1018 }
1019 
rtnl_prop_list_size(const struct net_device * dev)1020 static size_t rtnl_prop_list_size(const struct net_device *dev)
1021 {
1022 	struct netdev_name_node *name_node;
1023 	size_t size;
1024 
1025 	if (list_empty(&dev->name_node->list))
1026 		return 0;
1027 	size = nla_total_size(0);
1028 	list_for_each_entry(name_node, &dev->name_node->list, list)
1029 		size += nla_total_size(ALTIFNAMSIZ);
1030 	return size;
1031 }
1032 
rtnl_proto_down_size(const struct net_device * dev)1033 static size_t rtnl_proto_down_size(const struct net_device *dev)
1034 {
1035 	size_t size = nla_total_size(1);
1036 
1037 	if (dev->proto_down_reason)
1038 		size += nla_total_size(0) + nla_total_size(4);
1039 
1040 	return size;
1041 }
1042 
if_nlmsg_size(const struct net_device * dev,u32 ext_filter_mask)1043 static noinline size_t if_nlmsg_size(const struct net_device *dev,
1044 				     u32 ext_filter_mask)
1045 {
1046 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
1047 	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
1048 	       + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
1049 	       + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
1050 	       + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
1051 	       + nla_total_size(sizeof(struct rtnl_link_stats))
1052 	       + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
1053 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
1054 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
1055 	       + nla_total_size(4) /* IFLA_TXQLEN */
1056 	       + nla_total_size(4) /* IFLA_WEIGHT */
1057 	       + nla_total_size(4) /* IFLA_MTU */
1058 	       + nla_total_size(4) /* IFLA_LINK */
1059 	       + nla_total_size(4) /* IFLA_MASTER */
1060 	       + nla_total_size(1) /* IFLA_CARRIER */
1061 	       + nla_total_size(4) /* IFLA_PROMISCUITY */
1062 	       + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1063 	       + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1064 	       + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1065 	       + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1066 	       + nla_total_size(4) /* IFLA_GRO_MAX_SIZE */
1067 	       + nla_total_size(4) /* IFLA_TSO_MAX_SIZE */
1068 	       + nla_total_size(4) /* IFLA_TSO_MAX_SEGS */
1069 	       + nla_total_size(1) /* IFLA_OPERSTATE */
1070 	       + nla_total_size(1) /* IFLA_LINKMODE */
1071 	       + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1072 	       + nla_total_size(4) /* IFLA_LINK_NETNSID */
1073 	       + nla_total_size(4) /* IFLA_GROUP */
1074 	       + nla_total_size(ext_filter_mask
1075 			        & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1076 	       + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1077 	       + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1078 	       + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1079 	       + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1080 	       + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1081 	       + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1082 	       + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1083 	       + rtnl_xdp_size() /* IFLA_XDP */
1084 	       + nla_total_size(4)  /* IFLA_EVENT */
1085 	       + nla_total_size(4)  /* IFLA_NEW_NETNSID */
1086 	       + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
1087 	       + rtnl_proto_down_size(dev)  /* proto down */
1088 	       + nla_total_size(4)  /* IFLA_TARGET_NETNSID */
1089 	       + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
1090 	       + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
1091 	       + nla_total_size(4)  /* IFLA_MIN_MTU */
1092 	       + nla_total_size(4)  /* IFLA_MAX_MTU */
1093 	       + rtnl_prop_list_size(dev)
1094 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
1095 	       + 0;
1096 }
1097 
rtnl_vf_ports_fill(struct sk_buff * skb,struct net_device * dev)1098 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1099 {
1100 	struct nlattr *vf_ports;
1101 	struct nlattr *vf_port;
1102 	int vf;
1103 	int err;
1104 
1105 	vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
1106 	if (!vf_ports)
1107 		return -EMSGSIZE;
1108 
1109 	for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1110 		vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
1111 		if (!vf_port)
1112 			goto nla_put_failure;
1113 		if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1114 			goto nla_put_failure;
1115 		err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1116 		if (err == -EMSGSIZE)
1117 			goto nla_put_failure;
1118 		if (err) {
1119 			nla_nest_cancel(skb, vf_port);
1120 			continue;
1121 		}
1122 		nla_nest_end(skb, vf_port);
1123 	}
1124 
1125 	nla_nest_end(skb, vf_ports);
1126 
1127 	return 0;
1128 
1129 nla_put_failure:
1130 	nla_nest_cancel(skb, vf_ports);
1131 	return -EMSGSIZE;
1132 }
1133 
rtnl_port_self_fill(struct sk_buff * skb,struct net_device * dev)1134 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1135 {
1136 	struct nlattr *port_self;
1137 	int err;
1138 
1139 	port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
1140 	if (!port_self)
1141 		return -EMSGSIZE;
1142 
1143 	err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1144 	if (err) {
1145 		nla_nest_cancel(skb, port_self);
1146 		return (err == -EMSGSIZE) ? err : 0;
1147 	}
1148 
1149 	nla_nest_end(skb, port_self);
1150 
1151 	return 0;
1152 }
1153 
rtnl_port_fill(struct sk_buff * skb,struct net_device * dev,u32 ext_filter_mask)1154 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1155 			  u32 ext_filter_mask)
1156 {
1157 	int err;
1158 
1159 	if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1160 	    !(ext_filter_mask & RTEXT_FILTER_VF))
1161 		return 0;
1162 
1163 	err = rtnl_port_self_fill(skb, dev);
1164 	if (err)
1165 		return err;
1166 
1167 	if (dev_num_vf(dev->dev.parent)) {
1168 		err = rtnl_vf_ports_fill(skb, dev);
1169 		if (err)
1170 			return err;
1171 	}
1172 
1173 	return 0;
1174 }
1175 
rtnl_phys_port_id_fill(struct sk_buff * skb,struct net_device * dev)1176 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1177 {
1178 	int err;
1179 	struct netdev_phys_item_id ppid;
1180 
1181 	err = dev_get_phys_port_id(dev, &ppid);
1182 	if (err) {
1183 		if (err == -EOPNOTSUPP)
1184 			return 0;
1185 		return err;
1186 	}
1187 
1188 	if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1189 		return -EMSGSIZE;
1190 
1191 	return 0;
1192 }
1193 
rtnl_phys_port_name_fill(struct sk_buff * skb,struct net_device * dev)1194 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1195 {
1196 	char name[IFNAMSIZ];
1197 	int err;
1198 
1199 	err = dev_get_phys_port_name(dev, name, sizeof(name));
1200 	if (err) {
1201 		if (err == -EOPNOTSUPP)
1202 			return 0;
1203 		return err;
1204 	}
1205 
1206 	if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1207 		return -EMSGSIZE;
1208 
1209 	return 0;
1210 }
1211 
rtnl_phys_switch_id_fill(struct sk_buff * skb,struct net_device * dev)1212 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1213 {
1214 	struct netdev_phys_item_id ppid = { };
1215 	int err;
1216 
1217 	err = dev_get_port_parent_id(dev, &ppid, false);
1218 	if (err) {
1219 		if (err == -EOPNOTSUPP)
1220 			return 0;
1221 		return err;
1222 	}
1223 
1224 	if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
1225 		return -EMSGSIZE;
1226 
1227 	return 0;
1228 }
1229 
rtnl_fill_stats(struct sk_buff * skb,struct net_device * dev)1230 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1231 					      struct net_device *dev)
1232 {
1233 	struct rtnl_link_stats64 *sp;
1234 	struct nlattr *attr;
1235 
1236 	attr = nla_reserve_64bit(skb, IFLA_STATS64,
1237 				 sizeof(struct rtnl_link_stats64), IFLA_PAD);
1238 	if (!attr)
1239 		return -EMSGSIZE;
1240 
1241 	sp = nla_data(attr);
1242 	dev_get_stats(dev, sp);
1243 
1244 	attr = nla_reserve(skb, IFLA_STATS,
1245 			   sizeof(struct rtnl_link_stats));
1246 	if (!attr)
1247 		return -EMSGSIZE;
1248 
1249 	copy_rtnl_link_stats(nla_data(attr), sp);
1250 
1251 	return 0;
1252 }
1253 
rtnl_fill_vfinfo(struct sk_buff * skb,struct net_device * dev,int vfs_num,struct nlattr * vfinfo)1254 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1255 					       struct net_device *dev,
1256 					       int vfs_num,
1257 					       struct nlattr *vfinfo)
1258 {
1259 	struct ifla_vf_rss_query_en vf_rss_query_en;
1260 	struct nlattr *vf, *vfstats, *vfvlanlist;
1261 	struct ifla_vf_link_state vf_linkstate;
1262 	struct ifla_vf_vlan_info vf_vlan_info;
1263 	struct ifla_vf_spoofchk vf_spoofchk;
1264 	struct ifla_vf_tx_rate vf_tx_rate;
1265 	struct ifla_vf_stats vf_stats;
1266 	struct ifla_vf_trust vf_trust;
1267 	struct ifla_vf_vlan vf_vlan;
1268 	struct ifla_vf_rate vf_rate;
1269 	struct ifla_vf_mac vf_mac;
1270 	struct ifla_vf_broadcast vf_broadcast;
1271 	struct ifla_vf_info ivi;
1272 	struct ifla_vf_guid node_guid;
1273 	struct ifla_vf_guid port_guid;
1274 
1275 	memset(&ivi, 0, sizeof(ivi));
1276 
1277 	/* Not all SR-IOV capable drivers support the
1278 	 * spoofcheck and "RSS query enable" query.  Preset to
1279 	 * -1 so the user space tool can detect that the driver
1280 	 * didn't report anything.
1281 	 */
1282 	ivi.spoofchk = -1;
1283 	ivi.rss_query_en = -1;
1284 	ivi.trusted = -1;
1285 	/* The default value for VF link state is "auto"
1286 	 * IFLA_VF_LINK_STATE_AUTO which equals zero
1287 	 */
1288 	ivi.linkstate = 0;
1289 	/* VLAN Protocol by default is 802.1Q */
1290 	ivi.vlan_proto = htons(ETH_P_8021Q);
1291 	if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1292 		return 0;
1293 
1294 	memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1295 	memset(&node_guid, 0, sizeof(node_guid));
1296 	memset(&port_guid, 0, sizeof(port_guid));
1297 
1298 	vf_mac.vf =
1299 		vf_vlan.vf =
1300 		vf_vlan_info.vf =
1301 		vf_rate.vf =
1302 		vf_tx_rate.vf =
1303 		vf_spoofchk.vf =
1304 		vf_linkstate.vf =
1305 		vf_rss_query_en.vf =
1306 		vf_trust.vf =
1307 		node_guid.vf =
1308 		port_guid.vf = ivi.vf;
1309 
1310 	memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1311 	memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
1312 	vf_vlan.vlan = ivi.vlan;
1313 	vf_vlan.qos = ivi.qos;
1314 	vf_vlan_info.vlan = ivi.vlan;
1315 	vf_vlan_info.qos = ivi.qos;
1316 	vf_vlan_info.vlan_proto = ivi.vlan_proto;
1317 	vf_tx_rate.rate = ivi.max_tx_rate;
1318 	vf_rate.min_tx_rate = ivi.min_tx_rate;
1319 	vf_rate.max_tx_rate = ivi.max_tx_rate;
1320 	vf_spoofchk.setting = ivi.spoofchk;
1321 	vf_linkstate.link_state = ivi.linkstate;
1322 	vf_rss_query_en.setting = ivi.rss_query_en;
1323 	vf_trust.setting = ivi.trusted;
1324 	vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1325 	if (!vf)
1326 		goto nla_put_vfinfo_failure;
1327 	if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1328 	    nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
1329 	    nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1330 	    nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1331 		    &vf_rate) ||
1332 	    nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1333 		    &vf_tx_rate) ||
1334 	    nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1335 		    &vf_spoofchk) ||
1336 	    nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1337 		    &vf_linkstate) ||
1338 	    nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1339 		    sizeof(vf_rss_query_en),
1340 		    &vf_rss_query_en) ||
1341 	    nla_put(skb, IFLA_VF_TRUST,
1342 		    sizeof(vf_trust), &vf_trust))
1343 		goto nla_put_vf_failure;
1344 
1345 	if (dev->netdev_ops->ndo_get_vf_guid &&
1346 	    !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
1347 					      &port_guid)) {
1348 		if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
1349 			    &node_guid) ||
1350 		    nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
1351 			    &port_guid))
1352 			goto nla_put_vf_failure;
1353 	}
1354 	vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1355 	if (!vfvlanlist)
1356 		goto nla_put_vf_failure;
1357 	if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1358 		    &vf_vlan_info)) {
1359 		nla_nest_cancel(skb, vfvlanlist);
1360 		goto nla_put_vf_failure;
1361 	}
1362 	nla_nest_end(skb, vfvlanlist);
1363 	memset(&vf_stats, 0, sizeof(vf_stats));
1364 	if (dev->netdev_ops->ndo_get_vf_stats)
1365 		dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1366 						&vf_stats);
1367 	vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1368 	if (!vfstats)
1369 		goto nla_put_vf_failure;
1370 	if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1371 			      vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1372 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1373 			      vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1374 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1375 			      vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1376 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1377 			      vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1378 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1379 			      vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1380 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1381 			      vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1382 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1383 			      vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1384 	    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1385 			      vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1386 		nla_nest_cancel(skb, vfstats);
1387 		goto nla_put_vf_failure;
1388 	}
1389 	nla_nest_end(skb, vfstats);
1390 	nla_nest_end(skb, vf);
1391 	return 0;
1392 
1393 nla_put_vf_failure:
1394 	nla_nest_cancel(skb, vf);
1395 nla_put_vfinfo_failure:
1396 	nla_nest_cancel(skb, vfinfo);
1397 	return -EMSGSIZE;
1398 }
1399 
rtnl_fill_vf(struct sk_buff * skb,struct net_device * dev,u32 ext_filter_mask)1400 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1401 					   struct net_device *dev,
1402 					   u32 ext_filter_mask)
1403 {
1404 	struct nlattr *vfinfo;
1405 	int i, num_vfs;
1406 
1407 	if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1408 		return 0;
1409 
1410 	num_vfs = dev_num_vf(dev->dev.parent);
1411 	if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1412 		return -EMSGSIZE;
1413 
1414 	if (!dev->netdev_ops->ndo_get_vf_config)
1415 		return 0;
1416 
1417 	vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1418 	if (!vfinfo)
1419 		return -EMSGSIZE;
1420 
1421 	for (i = 0; i < num_vfs; i++) {
1422 		if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1423 			return -EMSGSIZE;
1424 	}
1425 
1426 	nla_nest_end(skb, vfinfo);
1427 	return 0;
1428 }
1429 
rtnl_fill_link_ifmap(struct sk_buff * skb,struct net_device * dev)1430 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1431 {
1432 	struct rtnl_link_ifmap map;
1433 
1434 	memset(&map, 0, sizeof(map));
1435 	map.mem_start   = dev->mem_start;
1436 	map.mem_end     = dev->mem_end;
1437 	map.base_addr   = dev->base_addr;
1438 	map.irq         = dev->irq;
1439 	map.dma         = dev->dma;
1440 	map.port        = dev->if_port;
1441 
1442 	if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1443 		return -EMSGSIZE;
1444 
1445 	return 0;
1446 }
1447 
rtnl_xdp_prog_skb(struct net_device * dev)1448 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1449 {
1450 	const struct bpf_prog *generic_xdp_prog;
1451 
1452 	ASSERT_RTNL();
1453 
1454 	generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1455 	if (!generic_xdp_prog)
1456 		return 0;
1457 	return generic_xdp_prog->aux->id;
1458 }
1459 
rtnl_xdp_prog_drv(struct net_device * dev)1460 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1461 {
1462 	return dev_xdp_prog_id(dev, XDP_MODE_DRV);
1463 }
1464 
rtnl_xdp_prog_hw(struct net_device * dev)1465 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1466 {
1467 	return dev_xdp_prog_id(dev, XDP_MODE_HW);
1468 }
1469 
rtnl_xdp_report_one(struct sk_buff * skb,struct net_device * dev,u32 * prog_id,u8 * mode,u8 tgt_mode,u32 attr,u32 (* get_prog_id)(struct net_device * dev))1470 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1471 			       u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1472 			       u32 (*get_prog_id)(struct net_device *dev))
1473 {
1474 	u32 curr_id;
1475 	int err;
1476 
1477 	curr_id = get_prog_id(dev);
1478 	if (!curr_id)
1479 		return 0;
1480 
1481 	*prog_id = curr_id;
1482 	err = nla_put_u32(skb, attr, curr_id);
1483 	if (err)
1484 		return err;
1485 
1486 	if (*mode != XDP_ATTACHED_NONE)
1487 		*mode = XDP_ATTACHED_MULTI;
1488 	else
1489 		*mode = tgt_mode;
1490 
1491 	return 0;
1492 }
1493 
rtnl_xdp_fill(struct sk_buff * skb,struct net_device * dev)1494 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1495 {
1496 	struct nlattr *xdp;
1497 	u32 prog_id;
1498 	int err;
1499 	u8 mode;
1500 
1501 	xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1502 	if (!xdp)
1503 		return -EMSGSIZE;
1504 
1505 	prog_id = 0;
1506 	mode = XDP_ATTACHED_NONE;
1507 	err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1508 				  IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1509 	if (err)
1510 		goto err_cancel;
1511 	err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1512 				  IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1513 	if (err)
1514 		goto err_cancel;
1515 	err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1516 				  IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1517 	if (err)
1518 		goto err_cancel;
1519 
1520 	err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1521 	if (err)
1522 		goto err_cancel;
1523 
1524 	if (prog_id && mode != XDP_ATTACHED_MULTI) {
1525 		err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1526 		if (err)
1527 			goto err_cancel;
1528 	}
1529 
1530 	nla_nest_end(skb, xdp);
1531 	return 0;
1532 
1533 err_cancel:
1534 	nla_nest_cancel(skb, xdp);
1535 	return err;
1536 }
1537 
rtnl_get_event(unsigned long event)1538 static u32 rtnl_get_event(unsigned long event)
1539 {
1540 	u32 rtnl_event_type = IFLA_EVENT_NONE;
1541 
1542 	switch (event) {
1543 	case NETDEV_REBOOT:
1544 		rtnl_event_type = IFLA_EVENT_REBOOT;
1545 		break;
1546 	case NETDEV_FEAT_CHANGE:
1547 		rtnl_event_type = IFLA_EVENT_FEATURES;
1548 		break;
1549 	case NETDEV_BONDING_FAILOVER:
1550 		rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1551 		break;
1552 	case NETDEV_NOTIFY_PEERS:
1553 		rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1554 		break;
1555 	case NETDEV_RESEND_IGMP:
1556 		rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1557 		break;
1558 	case NETDEV_CHANGEINFODATA:
1559 		rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1560 		break;
1561 	default:
1562 		break;
1563 	}
1564 
1565 	return rtnl_event_type;
1566 }
1567 
put_master_ifindex(struct sk_buff * skb,struct net_device * dev)1568 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1569 {
1570 	const struct net_device *upper_dev;
1571 	int ret = 0;
1572 
1573 	rcu_read_lock();
1574 
1575 	upper_dev = netdev_master_upper_dev_get_rcu(dev);
1576 	if (upper_dev)
1577 		ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1578 
1579 	rcu_read_unlock();
1580 	return ret;
1581 }
1582 
nla_put_iflink(struct sk_buff * skb,const struct net_device * dev,bool force)1583 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1584 			  bool force)
1585 {
1586 	int ifindex = dev_get_iflink(dev);
1587 
1588 	if (force || dev->ifindex != ifindex)
1589 		return nla_put_u32(skb, IFLA_LINK, ifindex);
1590 
1591 	return 0;
1592 }
1593 
nla_put_ifalias(struct sk_buff * skb,struct net_device * dev)1594 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1595 					      struct net_device *dev)
1596 {
1597 	char buf[IFALIASZ];
1598 	int ret;
1599 
1600 	ret = dev_get_alias(dev, buf, sizeof(buf));
1601 	return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1602 }
1603 
rtnl_fill_link_netnsid(struct sk_buff * skb,const struct net_device * dev,struct net * src_net,gfp_t gfp)1604 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1605 				  const struct net_device *dev,
1606 				  struct net *src_net, gfp_t gfp)
1607 {
1608 	bool put_iflink = false;
1609 
1610 	if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1611 		struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1612 
1613 		if (!net_eq(dev_net(dev), link_net)) {
1614 			int id = peernet2id_alloc(src_net, link_net, gfp);
1615 
1616 			if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1617 				return -EMSGSIZE;
1618 
1619 			put_iflink = true;
1620 		}
1621 	}
1622 
1623 	return nla_put_iflink(skb, dev, put_iflink);
1624 }
1625 
rtnl_fill_link_af(struct sk_buff * skb,const struct net_device * dev,u32 ext_filter_mask)1626 static int rtnl_fill_link_af(struct sk_buff *skb,
1627 			     const struct net_device *dev,
1628 			     u32 ext_filter_mask)
1629 {
1630 	const struct rtnl_af_ops *af_ops;
1631 	struct nlattr *af_spec;
1632 
1633 	af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1634 	if (!af_spec)
1635 		return -EMSGSIZE;
1636 
1637 	list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1638 		struct nlattr *af;
1639 		int err;
1640 
1641 		if (!af_ops->fill_link_af)
1642 			continue;
1643 
1644 		af = nla_nest_start_noflag(skb, af_ops->family);
1645 		if (!af)
1646 			return -EMSGSIZE;
1647 
1648 		err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1649 		/*
1650 		 * Caller may return ENODATA to indicate that there
1651 		 * was no data to be dumped. This is not an error, it
1652 		 * means we should trim the attribute header and
1653 		 * continue.
1654 		 */
1655 		if (err == -ENODATA)
1656 			nla_nest_cancel(skb, af);
1657 		else if (err < 0)
1658 			return -EMSGSIZE;
1659 
1660 		nla_nest_end(skb, af);
1661 	}
1662 
1663 	nla_nest_end(skb, af_spec);
1664 	return 0;
1665 }
1666 
rtnl_fill_alt_ifnames(struct sk_buff * skb,const struct net_device * dev)1667 static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
1668 				 const struct net_device *dev)
1669 {
1670 	struct netdev_name_node *name_node;
1671 	int count = 0;
1672 
1673 	list_for_each_entry(name_node, &dev->name_node->list, list) {
1674 		if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
1675 			return -EMSGSIZE;
1676 		count++;
1677 	}
1678 	return count;
1679 }
1680 
rtnl_fill_prop_list(struct sk_buff * skb,const struct net_device * dev)1681 static int rtnl_fill_prop_list(struct sk_buff *skb,
1682 			       const struct net_device *dev)
1683 {
1684 	struct nlattr *prop_list;
1685 	int ret;
1686 
1687 	prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
1688 	if (!prop_list)
1689 		return -EMSGSIZE;
1690 
1691 	ret = rtnl_fill_alt_ifnames(skb, dev);
1692 	if (ret <= 0)
1693 		goto nest_cancel;
1694 
1695 	nla_nest_end(skb, prop_list);
1696 	return 0;
1697 
1698 nest_cancel:
1699 	nla_nest_cancel(skb, prop_list);
1700 	return ret;
1701 }
1702 
rtnl_fill_proto_down(struct sk_buff * skb,const struct net_device * dev)1703 static int rtnl_fill_proto_down(struct sk_buff *skb,
1704 				const struct net_device *dev)
1705 {
1706 	struct nlattr *pr;
1707 	u32 preason;
1708 
1709 	if (nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1710 		goto nla_put_failure;
1711 
1712 	preason = dev->proto_down_reason;
1713 	if (!preason)
1714 		return 0;
1715 
1716 	pr = nla_nest_start(skb, IFLA_PROTO_DOWN_REASON);
1717 	if (!pr)
1718 		return -EMSGSIZE;
1719 
1720 	if (nla_put_u32(skb, IFLA_PROTO_DOWN_REASON_VALUE, preason)) {
1721 		nla_nest_cancel(skb, pr);
1722 		goto nla_put_failure;
1723 	}
1724 
1725 	nla_nest_end(skb, pr);
1726 	return 0;
1727 
1728 nla_put_failure:
1729 	return -EMSGSIZE;
1730 }
1731 
rtnl_fill_ifinfo(struct sk_buff * skb,struct net_device * dev,struct net * src_net,int type,u32 pid,u32 seq,u32 change,unsigned int flags,u32 ext_filter_mask,u32 event,int * new_nsid,int new_ifindex,int tgt_netnsid,gfp_t gfp)1732 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1733 			    struct net_device *dev, struct net *src_net,
1734 			    int type, u32 pid, u32 seq, u32 change,
1735 			    unsigned int flags, u32 ext_filter_mask,
1736 			    u32 event, int *new_nsid, int new_ifindex,
1737 			    int tgt_netnsid, gfp_t gfp)
1738 {
1739 	struct ifinfomsg *ifm;
1740 	struct nlmsghdr *nlh;
1741 	struct Qdisc *qdisc;
1742 
1743 	ASSERT_RTNL();
1744 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1745 	if (nlh == NULL)
1746 		return -EMSGSIZE;
1747 
1748 	ifm = nlmsg_data(nlh);
1749 	ifm->ifi_family = AF_UNSPEC;
1750 	ifm->__ifi_pad = 0;
1751 	ifm->ifi_type = dev->type;
1752 	ifm->ifi_index = dev->ifindex;
1753 	ifm->ifi_flags = dev_get_flags(dev);
1754 	ifm->ifi_change = change;
1755 
1756 	if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1757 		goto nla_put_failure;
1758 
1759 	qdisc = rtnl_dereference(dev->qdisc);
1760 	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1761 	    nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1762 	    nla_put_u8(skb, IFLA_OPERSTATE,
1763 		       netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1764 	    nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1765 	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1766 	    nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1767 	    nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1768 	    nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1769 	    nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1770 	    nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1771 	    nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1772 	    nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1773 	    nla_put_u32(skb, IFLA_GRO_MAX_SIZE, dev->gro_max_size) ||
1774 	    nla_put_u32(skb, IFLA_TSO_MAX_SIZE, dev->tso_max_size) ||
1775 	    nla_put_u32(skb, IFLA_TSO_MAX_SEGS, dev->tso_max_segs) ||
1776 #ifdef CONFIG_RPS
1777 	    nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1778 #endif
1779 	    put_master_ifindex(skb, dev) ||
1780 	    nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1781 	    (qdisc &&
1782 	     nla_put_string(skb, IFLA_QDISC, qdisc->ops->id)) ||
1783 	    nla_put_ifalias(skb, dev) ||
1784 	    nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1785 			atomic_read(&dev->carrier_up_count) +
1786 			atomic_read(&dev->carrier_down_count)) ||
1787 	    nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1788 			atomic_read(&dev->carrier_up_count)) ||
1789 	    nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1790 			atomic_read(&dev->carrier_down_count)))
1791 		goto nla_put_failure;
1792 
1793 	if (rtnl_fill_proto_down(skb, dev))
1794 		goto nla_put_failure;
1795 
1796 	if (event != IFLA_EVENT_NONE) {
1797 		if (nla_put_u32(skb, IFLA_EVENT, event))
1798 			goto nla_put_failure;
1799 	}
1800 
1801 	if (rtnl_fill_link_ifmap(skb, dev))
1802 		goto nla_put_failure;
1803 
1804 	if (dev->addr_len) {
1805 		if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1806 		    nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1807 			goto nla_put_failure;
1808 	}
1809 
1810 	if (rtnl_phys_port_id_fill(skb, dev))
1811 		goto nla_put_failure;
1812 
1813 	if (rtnl_phys_port_name_fill(skb, dev))
1814 		goto nla_put_failure;
1815 
1816 	if (rtnl_phys_switch_id_fill(skb, dev))
1817 		goto nla_put_failure;
1818 
1819 	if (rtnl_fill_stats(skb, dev))
1820 		goto nla_put_failure;
1821 
1822 	if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1823 		goto nla_put_failure;
1824 
1825 	if (rtnl_port_fill(skb, dev, ext_filter_mask))
1826 		goto nla_put_failure;
1827 
1828 	if (rtnl_xdp_fill(skb, dev))
1829 		goto nla_put_failure;
1830 
1831 	if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1832 		if (rtnl_link_fill(skb, dev) < 0)
1833 			goto nla_put_failure;
1834 	}
1835 
1836 	if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1837 		goto nla_put_failure;
1838 
1839 	if (new_nsid &&
1840 	    nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1841 		goto nla_put_failure;
1842 	if (new_ifindex &&
1843 	    nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1844 		goto nla_put_failure;
1845 
1846 	if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
1847 	    nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
1848 		goto nla_put_failure;
1849 
1850 	rcu_read_lock();
1851 	if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1852 		goto nla_put_failure_rcu;
1853 	rcu_read_unlock();
1854 
1855 	if (rtnl_fill_prop_list(skb, dev))
1856 		goto nla_put_failure;
1857 
1858 	if (dev->dev.parent &&
1859 	    nla_put_string(skb, IFLA_PARENT_DEV_NAME,
1860 			   dev_name(dev->dev.parent)))
1861 		goto nla_put_failure;
1862 
1863 	if (dev->dev.parent && dev->dev.parent->bus &&
1864 	    nla_put_string(skb, IFLA_PARENT_DEV_BUS_NAME,
1865 			   dev->dev.parent->bus->name))
1866 		goto nla_put_failure;
1867 
1868 	nlmsg_end(skb, nlh);
1869 	return 0;
1870 
1871 nla_put_failure_rcu:
1872 	rcu_read_unlock();
1873 nla_put_failure:
1874 	nlmsg_cancel(skb, nlh);
1875 	return -EMSGSIZE;
1876 }
1877 
1878 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1879 	[IFLA_IFNAME]		= { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1880 	[IFLA_ADDRESS]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1881 	[IFLA_BROADCAST]	= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1882 	[IFLA_MAP]		= { .len = sizeof(struct rtnl_link_ifmap) },
1883 	[IFLA_MTU]		= { .type = NLA_U32 },
1884 	[IFLA_LINK]		= { .type = NLA_U32 },
1885 	[IFLA_MASTER]		= { .type = NLA_U32 },
1886 	[IFLA_CARRIER]		= { .type = NLA_U8 },
1887 	[IFLA_TXQLEN]		= { .type = NLA_U32 },
1888 	[IFLA_WEIGHT]		= { .type = NLA_U32 },
1889 	[IFLA_OPERSTATE]	= { .type = NLA_U8 },
1890 	[IFLA_LINKMODE]		= { .type = NLA_U8 },
1891 	[IFLA_LINKINFO]		= { .type = NLA_NESTED },
1892 	[IFLA_NET_NS_PID]	= { .type = NLA_U32 },
1893 	[IFLA_NET_NS_FD]	= { .type = NLA_U32 },
1894 	/* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1895 	 * allow 0-length string (needed to remove an alias).
1896 	 */
1897 	[IFLA_IFALIAS]	        = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1898 	[IFLA_VFINFO_LIST]	= {. type = NLA_NESTED },
1899 	[IFLA_VF_PORTS]		= { .type = NLA_NESTED },
1900 	[IFLA_PORT_SELF]	= { .type = NLA_NESTED },
1901 	[IFLA_AF_SPEC]		= { .type = NLA_NESTED },
1902 	[IFLA_EXT_MASK]		= { .type = NLA_U32 },
1903 	[IFLA_PROMISCUITY]	= { .type = NLA_U32 },
1904 	[IFLA_NUM_TX_QUEUES]	= { .type = NLA_U32 },
1905 	[IFLA_NUM_RX_QUEUES]	= { .type = NLA_U32 },
1906 	[IFLA_GSO_MAX_SEGS]	= { .type = NLA_U32 },
1907 	[IFLA_GSO_MAX_SIZE]	= { .type = NLA_U32 },
1908 	[IFLA_PHYS_PORT_ID]	= { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1909 	[IFLA_CARRIER_CHANGES]	= { .type = NLA_U32 },  /* ignored */
1910 	[IFLA_PHYS_SWITCH_ID]	= { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1911 	[IFLA_LINK_NETNSID]	= { .type = NLA_S32 },
1912 	[IFLA_PROTO_DOWN]	= { .type = NLA_U8 },
1913 	[IFLA_XDP]		= { .type = NLA_NESTED },
1914 	[IFLA_EVENT]		= { .type = NLA_U32 },
1915 	[IFLA_GROUP]		= { .type = NLA_U32 },
1916 	[IFLA_TARGET_NETNSID]	= { .type = NLA_S32 },
1917 	[IFLA_CARRIER_UP_COUNT]	= { .type = NLA_U32 },
1918 	[IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1919 	[IFLA_MIN_MTU]		= { .type = NLA_U32 },
1920 	[IFLA_MAX_MTU]		= { .type = NLA_U32 },
1921 	[IFLA_PROP_LIST]	= { .type = NLA_NESTED },
1922 	[IFLA_ALT_IFNAME]	= { .type = NLA_STRING,
1923 				    .len = ALTIFNAMSIZ - 1 },
1924 	[IFLA_PERM_ADDRESS]	= { .type = NLA_REJECT },
1925 	[IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED },
1926 	[IFLA_NEW_IFINDEX]	= NLA_POLICY_MIN(NLA_S32, 1),
1927 	[IFLA_PARENT_DEV_NAME]	= { .type = NLA_NUL_STRING },
1928 	[IFLA_GRO_MAX_SIZE]	= { .type = NLA_U32 },
1929 	[IFLA_TSO_MAX_SIZE]	= { .type = NLA_REJECT },
1930 	[IFLA_TSO_MAX_SEGS]	= { .type = NLA_REJECT },
1931 };
1932 
1933 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1934 	[IFLA_INFO_KIND]	= { .type = NLA_STRING },
1935 	[IFLA_INFO_DATA]	= { .type = NLA_NESTED },
1936 	[IFLA_INFO_SLAVE_KIND]	= { .type = NLA_STRING },
1937 	[IFLA_INFO_SLAVE_DATA]	= { .type = NLA_NESTED },
1938 };
1939 
1940 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1941 	[IFLA_VF_MAC]		= { .len = sizeof(struct ifla_vf_mac) },
1942 	[IFLA_VF_BROADCAST]	= { .type = NLA_REJECT },
1943 	[IFLA_VF_VLAN]		= { .len = sizeof(struct ifla_vf_vlan) },
1944 	[IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1945 	[IFLA_VF_TX_RATE]	= { .len = sizeof(struct ifla_vf_tx_rate) },
1946 	[IFLA_VF_SPOOFCHK]	= { .len = sizeof(struct ifla_vf_spoofchk) },
1947 	[IFLA_VF_RATE]		= { .len = sizeof(struct ifla_vf_rate) },
1948 	[IFLA_VF_LINK_STATE]	= { .len = sizeof(struct ifla_vf_link_state) },
1949 	[IFLA_VF_RSS_QUERY_EN]	= { .len = sizeof(struct ifla_vf_rss_query_en) },
1950 	[IFLA_VF_STATS]		= { .type = NLA_NESTED },
1951 	[IFLA_VF_TRUST]		= { .len = sizeof(struct ifla_vf_trust) },
1952 	[IFLA_VF_IB_NODE_GUID]	= { .len = sizeof(struct ifla_vf_guid) },
1953 	[IFLA_VF_IB_PORT_GUID]	= { .len = sizeof(struct ifla_vf_guid) },
1954 };
1955 
1956 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1957 	[IFLA_PORT_VF]		= { .type = NLA_U32 },
1958 	[IFLA_PORT_PROFILE]	= { .type = NLA_STRING,
1959 				    .len = PORT_PROFILE_MAX },
1960 	[IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1961 				      .len = PORT_UUID_MAX },
1962 	[IFLA_PORT_HOST_UUID]	= { .type = NLA_STRING,
1963 				    .len = PORT_UUID_MAX },
1964 	[IFLA_PORT_REQUEST]	= { .type = NLA_U8, },
1965 	[IFLA_PORT_RESPONSE]	= { .type = NLA_U16, },
1966 
1967 	/* Unused, but we need to keep it here since user space could
1968 	 * fill it. It's also broken with regard to NLA_BINARY use in
1969 	 * combination with structs.
1970 	 */
1971 	[IFLA_PORT_VSI_TYPE]	= { .type = NLA_BINARY,
1972 				    .len = sizeof(struct ifla_port_vsi) },
1973 };
1974 
1975 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1976 	[IFLA_XDP_UNSPEC]	= { .strict_start_type = IFLA_XDP_EXPECTED_FD },
1977 	[IFLA_XDP_FD]		= { .type = NLA_S32 },
1978 	[IFLA_XDP_EXPECTED_FD]	= { .type = NLA_S32 },
1979 	[IFLA_XDP_ATTACHED]	= { .type = NLA_U8 },
1980 	[IFLA_XDP_FLAGS]	= { .type = NLA_U32 },
1981 	[IFLA_XDP_PROG_ID]	= { .type = NLA_U32 },
1982 };
1983 
linkinfo_to_kind_ops(const struct nlattr * nla)1984 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1985 {
1986 	const struct rtnl_link_ops *ops = NULL;
1987 	struct nlattr *linfo[IFLA_INFO_MAX + 1];
1988 
1989 	if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
1990 		return NULL;
1991 
1992 	if (linfo[IFLA_INFO_KIND]) {
1993 		char kind[MODULE_NAME_LEN];
1994 
1995 		nla_strscpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1996 		ops = rtnl_link_ops_get(kind);
1997 	}
1998 
1999 	return ops;
2000 }
2001 
link_master_filtered(struct net_device * dev,int master_idx)2002 static bool link_master_filtered(struct net_device *dev, int master_idx)
2003 {
2004 	struct net_device *master;
2005 
2006 	if (!master_idx)
2007 		return false;
2008 
2009 	master = netdev_master_upper_dev_get(dev);
2010 
2011 	/* 0 is already used to denote IFLA_MASTER wasn't passed, therefore need
2012 	 * another invalid value for ifindex to denote "no master".
2013 	 */
2014 	if (master_idx == -1)
2015 		return !!master;
2016 
2017 	if (!master || master->ifindex != master_idx)
2018 		return true;
2019 
2020 	return false;
2021 }
2022 
link_kind_filtered(const struct net_device * dev,const struct rtnl_link_ops * kind_ops)2023 static bool link_kind_filtered(const struct net_device *dev,
2024 			       const struct rtnl_link_ops *kind_ops)
2025 {
2026 	if (kind_ops && dev->rtnl_link_ops != kind_ops)
2027 		return true;
2028 
2029 	return false;
2030 }
2031 
link_dump_filtered(struct net_device * dev,int master_idx,const struct rtnl_link_ops * kind_ops)2032 static bool link_dump_filtered(struct net_device *dev,
2033 			       int master_idx,
2034 			       const struct rtnl_link_ops *kind_ops)
2035 {
2036 	if (link_master_filtered(dev, master_idx) ||
2037 	    link_kind_filtered(dev, kind_ops))
2038 		return true;
2039 
2040 	return false;
2041 }
2042 
2043 /**
2044  * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
2045  * @sk: netlink socket
2046  * @netnsid: network namespace identifier
2047  *
2048  * Returns the network namespace identified by netnsid on success or an error
2049  * pointer on failure.
2050  */
rtnl_get_net_ns_capable(struct sock * sk,int netnsid)2051 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
2052 {
2053 	struct net *net;
2054 
2055 	net = get_net_ns_by_id(sock_net(sk), netnsid);
2056 	if (!net)
2057 		return ERR_PTR(-EINVAL);
2058 
2059 	/* For now, the caller is required to have CAP_NET_ADMIN in
2060 	 * the user namespace owning the target net ns.
2061 	 */
2062 	if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
2063 		put_net(net);
2064 		return ERR_PTR(-EACCES);
2065 	}
2066 	return net;
2067 }
2068 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
2069 
rtnl_valid_dump_ifinfo_req(const struct nlmsghdr * nlh,bool strict_check,struct nlattr ** tb,struct netlink_ext_ack * extack)2070 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
2071 				      bool strict_check, struct nlattr **tb,
2072 				      struct netlink_ext_ack *extack)
2073 {
2074 	int hdrlen;
2075 
2076 	if (strict_check) {
2077 		struct ifinfomsg *ifm;
2078 
2079 		if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2080 			NL_SET_ERR_MSG(extack, "Invalid header for link dump");
2081 			return -EINVAL;
2082 		}
2083 
2084 		ifm = nlmsg_data(nlh);
2085 		if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2086 		    ifm->ifi_change) {
2087 			NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
2088 			return -EINVAL;
2089 		}
2090 		if (ifm->ifi_index) {
2091 			NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
2092 			return -EINVAL;
2093 		}
2094 
2095 		return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
2096 						     IFLA_MAX, ifla_policy,
2097 						     extack);
2098 	}
2099 
2100 	/* A hack to preserve kernel<->userspace interface.
2101 	 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
2102 	 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
2103 	 * what iproute2 < v3.9.0 used.
2104 	 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
2105 	 * attribute, its netlink message is shorter than struct ifinfomsg.
2106 	 */
2107 	hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2108 		 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2109 
2110 	return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
2111 				      extack);
2112 }
2113 
rtnl_dump_ifinfo(struct sk_buff * skb,struct netlink_callback * cb)2114 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2115 {
2116 	struct netlink_ext_ack *extack = cb->extack;
2117 	const struct nlmsghdr *nlh = cb->nlh;
2118 	struct net *net = sock_net(skb->sk);
2119 	struct net *tgt_net = net;
2120 	int h, s_h;
2121 	int idx = 0, s_idx;
2122 	struct net_device *dev;
2123 	struct hlist_head *head;
2124 	struct nlattr *tb[IFLA_MAX+1];
2125 	u32 ext_filter_mask = 0;
2126 	const struct rtnl_link_ops *kind_ops = NULL;
2127 	unsigned int flags = NLM_F_MULTI;
2128 	int master_idx = 0;
2129 	int netnsid = -1;
2130 	int err, i;
2131 
2132 	s_h = cb->args[0];
2133 	s_idx = cb->args[1];
2134 
2135 	err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
2136 	if (err < 0) {
2137 		if (cb->strict_check)
2138 			return err;
2139 
2140 		goto walk_entries;
2141 	}
2142 
2143 	for (i = 0; i <= IFLA_MAX; ++i) {
2144 		if (!tb[i])
2145 			continue;
2146 
2147 		/* new attributes should only be added with strict checking */
2148 		switch (i) {
2149 		case IFLA_TARGET_NETNSID:
2150 			netnsid = nla_get_s32(tb[i]);
2151 			tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
2152 			if (IS_ERR(tgt_net)) {
2153 				NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
2154 				return PTR_ERR(tgt_net);
2155 			}
2156 			break;
2157 		case IFLA_EXT_MASK:
2158 			ext_filter_mask = nla_get_u32(tb[i]);
2159 			break;
2160 		case IFLA_MASTER:
2161 			master_idx = nla_get_u32(tb[i]);
2162 			break;
2163 		case IFLA_LINKINFO:
2164 			kind_ops = linkinfo_to_kind_ops(tb[i]);
2165 			break;
2166 		default:
2167 			if (cb->strict_check) {
2168 				NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
2169 				return -EINVAL;
2170 			}
2171 		}
2172 	}
2173 
2174 	if (master_idx || kind_ops)
2175 		flags |= NLM_F_DUMP_FILTERED;
2176 
2177 walk_entries:
2178 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2179 		idx = 0;
2180 		head = &tgt_net->dev_index_head[h];
2181 		hlist_for_each_entry(dev, head, index_hlist) {
2182 			if (link_dump_filtered(dev, master_idx, kind_ops))
2183 				goto cont;
2184 			if (idx < s_idx)
2185 				goto cont;
2186 			err = rtnl_fill_ifinfo(skb, dev, net,
2187 					       RTM_NEWLINK,
2188 					       NETLINK_CB(cb->skb).portid,
2189 					       nlh->nlmsg_seq, 0, flags,
2190 					       ext_filter_mask, 0, NULL, 0,
2191 					       netnsid, GFP_KERNEL);
2192 
2193 			if (err < 0) {
2194 				if (likely(skb->len))
2195 					goto out;
2196 
2197 				goto out_err;
2198 			}
2199 cont:
2200 			idx++;
2201 		}
2202 	}
2203 out:
2204 	err = skb->len;
2205 out_err:
2206 	cb->args[1] = idx;
2207 	cb->args[0] = h;
2208 	cb->seq = tgt_net->dev_base_seq;
2209 	nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2210 	if (netnsid >= 0)
2211 		put_net(tgt_net);
2212 
2213 	return err;
2214 }
2215 
rtnl_nla_parse_ifla(struct nlattr ** tb,const struct nlattr * head,int len,struct netlink_ext_ack * exterr)2216 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2217 			struct netlink_ext_ack *exterr)
2218 {
2219 	return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
2220 				    exterr);
2221 }
2222 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
2223 
rtnl_link_get_net(struct net * src_net,struct nlattr * tb[])2224 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2225 {
2226 	struct net *net;
2227 	/* Examine the link attributes and figure out which
2228 	 * network namespace we are talking about.
2229 	 */
2230 	if (tb[IFLA_NET_NS_PID])
2231 		net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2232 	else if (tb[IFLA_NET_NS_FD])
2233 		net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2234 	else
2235 		net = get_net(src_net);
2236 	return net;
2237 }
2238 EXPORT_SYMBOL(rtnl_link_get_net);
2239 
2240 /* Figure out which network namespace we are talking about by
2241  * examining the link attributes in the following order:
2242  *
2243  * 1. IFLA_NET_NS_PID
2244  * 2. IFLA_NET_NS_FD
2245  * 3. IFLA_TARGET_NETNSID
2246  */
rtnl_link_get_net_by_nlattr(struct net * src_net,struct nlattr * tb[])2247 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2248 					       struct nlattr *tb[])
2249 {
2250 	struct net *net;
2251 
2252 	if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2253 		return rtnl_link_get_net(src_net, tb);
2254 
2255 	if (!tb[IFLA_TARGET_NETNSID])
2256 		return get_net(src_net);
2257 
2258 	net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2259 	if (!net)
2260 		return ERR_PTR(-EINVAL);
2261 
2262 	return net;
2263 }
2264 
rtnl_link_get_net_capable(const struct sk_buff * skb,struct net * src_net,struct nlattr * tb[],int cap)2265 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2266 					     struct net *src_net,
2267 					     struct nlattr *tb[], int cap)
2268 {
2269 	struct net *net;
2270 
2271 	net = rtnl_link_get_net_by_nlattr(src_net, tb);
2272 	if (IS_ERR(net))
2273 		return net;
2274 
2275 	if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2276 		put_net(net);
2277 		return ERR_PTR(-EPERM);
2278 	}
2279 
2280 	return net;
2281 }
2282 
2283 /* Verify that rtnetlink requests do not pass additional properties
2284  * potentially referring to different network namespaces.
2285  */
rtnl_ensure_unique_netns(struct nlattr * tb[],struct netlink_ext_ack * extack,bool netns_id_only)2286 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2287 				    struct netlink_ext_ack *extack,
2288 				    bool netns_id_only)
2289 {
2290 
2291 	if (netns_id_only) {
2292 		if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2293 			return 0;
2294 
2295 		NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2296 		return -EOPNOTSUPP;
2297 	}
2298 
2299 	if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2300 		goto invalid_attr;
2301 
2302 	if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2303 		goto invalid_attr;
2304 
2305 	if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2306 		goto invalid_attr;
2307 
2308 	return 0;
2309 
2310 invalid_attr:
2311 	NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2312 	return -EINVAL;
2313 }
2314 
rtnl_set_vf_rate(struct net_device * dev,int vf,int min_tx_rate,int max_tx_rate)2315 static	int rtnl_set_vf_rate(struct net_device *dev, int vf, int min_tx_rate,
2316 			     int max_tx_rate)
2317 {
2318 	const struct net_device_ops *ops = dev->netdev_ops;
2319 
2320 	if (!ops->ndo_set_vf_rate)
2321 		return -EOPNOTSUPP;
2322 	if (max_tx_rate && max_tx_rate < min_tx_rate)
2323 		return -EINVAL;
2324 
2325 	return ops->ndo_set_vf_rate(dev, vf, min_tx_rate, max_tx_rate);
2326 }
2327 
validate_linkmsg(struct net_device * dev,struct nlattr * tb[],struct netlink_ext_ack * extack)2328 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[],
2329 			    struct netlink_ext_ack *extack)
2330 {
2331 	if (dev) {
2332 		if (tb[IFLA_ADDRESS] &&
2333 		    nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2334 			return -EINVAL;
2335 
2336 		if (tb[IFLA_BROADCAST] &&
2337 		    nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2338 			return -EINVAL;
2339 	}
2340 
2341 	if (tb[IFLA_AF_SPEC]) {
2342 		struct nlattr *af;
2343 		int rem, err;
2344 
2345 		nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2346 			const struct rtnl_af_ops *af_ops;
2347 
2348 			af_ops = rtnl_af_lookup(nla_type(af));
2349 			if (!af_ops)
2350 				return -EAFNOSUPPORT;
2351 
2352 			if (!af_ops->set_link_af)
2353 				return -EOPNOTSUPP;
2354 
2355 			if (af_ops->validate_link_af) {
2356 				err = af_ops->validate_link_af(dev, af, extack);
2357 				if (err < 0)
2358 					return err;
2359 			}
2360 		}
2361 	}
2362 
2363 	return 0;
2364 }
2365 
handle_infiniband_guid(struct net_device * dev,struct ifla_vf_guid * ivt,int guid_type)2366 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2367 				  int guid_type)
2368 {
2369 	const struct net_device_ops *ops = dev->netdev_ops;
2370 
2371 	return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2372 }
2373 
handle_vf_guid(struct net_device * dev,struct ifla_vf_guid * ivt,int guid_type)2374 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2375 {
2376 	if (dev->type != ARPHRD_INFINIBAND)
2377 		return -EOPNOTSUPP;
2378 
2379 	return handle_infiniband_guid(dev, ivt, guid_type);
2380 }
2381 
do_setvfinfo(struct net_device * dev,struct nlattr ** tb)2382 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2383 {
2384 	const struct net_device_ops *ops = dev->netdev_ops;
2385 	int err = -EINVAL;
2386 
2387 	if (tb[IFLA_VF_MAC]) {
2388 		struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2389 
2390 		if (ivm->vf >= INT_MAX)
2391 			return -EINVAL;
2392 		err = -EOPNOTSUPP;
2393 		if (ops->ndo_set_vf_mac)
2394 			err = ops->ndo_set_vf_mac(dev, ivm->vf,
2395 						  ivm->mac);
2396 		if (err < 0)
2397 			return err;
2398 	}
2399 
2400 	if (tb[IFLA_VF_VLAN]) {
2401 		struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2402 
2403 		if (ivv->vf >= INT_MAX)
2404 			return -EINVAL;
2405 		err = -EOPNOTSUPP;
2406 		if (ops->ndo_set_vf_vlan)
2407 			err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2408 						   ivv->qos,
2409 						   htons(ETH_P_8021Q));
2410 		if (err < 0)
2411 			return err;
2412 	}
2413 
2414 	if (tb[IFLA_VF_VLAN_LIST]) {
2415 		struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2416 		struct nlattr *attr;
2417 		int rem, len = 0;
2418 
2419 		err = -EOPNOTSUPP;
2420 		if (!ops->ndo_set_vf_vlan)
2421 			return err;
2422 
2423 		nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2424 			if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2425 			    nla_len(attr) < NLA_HDRLEN) {
2426 				return -EINVAL;
2427 			}
2428 			if (len >= MAX_VLAN_LIST_LEN)
2429 				return -EOPNOTSUPP;
2430 			ivvl[len] = nla_data(attr);
2431 
2432 			len++;
2433 		}
2434 		if (len == 0)
2435 			return -EINVAL;
2436 
2437 		if (ivvl[0]->vf >= INT_MAX)
2438 			return -EINVAL;
2439 		err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2440 					   ivvl[0]->qos, ivvl[0]->vlan_proto);
2441 		if (err < 0)
2442 			return err;
2443 	}
2444 
2445 	if (tb[IFLA_VF_TX_RATE]) {
2446 		struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2447 		struct ifla_vf_info ivf;
2448 
2449 		if (ivt->vf >= INT_MAX)
2450 			return -EINVAL;
2451 		err = -EOPNOTSUPP;
2452 		if (ops->ndo_get_vf_config)
2453 			err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2454 		if (err < 0)
2455 			return err;
2456 
2457 		err = rtnl_set_vf_rate(dev, ivt->vf,
2458 				       ivf.min_tx_rate, ivt->rate);
2459 		if (err < 0)
2460 			return err;
2461 	}
2462 
2463 	if (tb[IFLA_VF_RATE]) {
2464 		struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2465 
2466 		if (ivt->vf >= INT_MAX)
2467 			return -EINVAL;
2468 
2469 		err = rtnl_set_vf_rate(dev, ivt->vf,
2470 				       ivt->min_tx_rate, ivt->max_tx_rate);
2471 		if (err < 0)
2472 			return err;
2473 	}
2474 
2475 	if (tb[IFLA_VF_SPOOFCHK]) {
2476 		struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2477 
2478 		if (ivs->vf >= INT_MAX)
2479 			return -EINVAL;
2480 		err = -EOPNOTSUPP;
2481 		if (ops->ndo_set_vf_spoofchk)
2482 			err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2483 						       ivs->setting);
2484 		if (err < 0)
2485 			return err;
2486 	}
2487 
2488 	if (tb[IFLA_VF_LINK_STATE]) {
2489 		struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2490 
2491 		if (ivl->vf >= INT_MAX)
2492 			return -EINVAL;
2493 		err = -EOPNOTSUPP;
2494 		if (ops->ndo_set_vf_link_state)
2495 			err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2496 							 ivl->link_state);
2497 		if (err < 0)
2498 			return err;
2499 	}
2500 
2501 	if (tb[IFLA_VF_RSS_QUERY_EN]) {
2502 		struct ifla_vf_rss_query_en *ivrssq_en;
2503 
2504 		err = -EOPNOTSUPP;
2505 		ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2506 		if (ivrssq_en->vf >= INT_MAX)
2507 			return -EINVAL;
2508 		if (ops->ndo_set_vf_rss_query_en)
2509 			err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2510 							   ivrssq_en->setting);
2511 		if (err < 0)
2512 			return err;
2513 	}
2514 
2515 	if (tb[IFLA_VF_TRUST]) {
2516 		struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2517 
2518 		if (ivt->vf >= INT_MAX)
2519 			return -EINVAL;
2520 		err = -EOPNOTSUPP;
2521 		if (ops->ndo_set_vf_trust)
2522 			err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2523 		if (err < 0)
2524 			return err;
2525 	}
2526 
2527 	if (tb[IFLA_VF_IB_NODE_GUID]) {
2528 		struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2529 
2530 		if (ivt->vf >= INT_MAX)
2531 			return -EINVAL;
2532 		if (!ops->ndo_set_vf_guid)
2533 			return -EOPNOTSUPP;
2534 		return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2535 	}
2536 
2537 	if (tb[IFLA_VF_IB_PORT_GUID]) {
2538 		struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2539 
2540 		if (ivt->vf >= INT_MAX)
2541 			return -EINVAL;
2542 		if (!ops->ndo_set_vf_guid)
2543 			return -EOPNOTSUPP;
2544 
2545 		return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2546 	}
2547 
2548 	return err;
2549 }
2550 
do_set_master(struct net_device * dev,int ifindex,struct netlink_ext_ack * extack)2551 static int do_set_master(struct net_device *dev, int ifindex,
2552 			 struct netlink_ext_ack *extack)
2553 {
2554 	struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2555 	const struct net_device_ops *ops;
2556 	int err;
2557 
2558 	if (upper_dev) {
2559 		if (upper_dev->ifindex == ifindex)
2560 			return 0;
2561 		ops = upper_dev->netdev_ops;
2562 		if (ops->ndo_del_slave) {
2563 			err = ops->ndo_del_slave(upper_dev, dev);
2564 			if (err)
2565 				return err;
2566 		} else {
2567 			return -EOPNOTSUPP;
2568 		}
2569 	}
2570 
2571 	if (ifindex) {
2572 		upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2573 		if (!upper_dev)
2574 			return -EINVAL;
2575 		ops = upper_dev->netdev_ops;
2576 		if (ops->ndo_add_slave) {
2577 			err = ops->ndo_add_slave(upper_dev, dev, extack);
2578 			if (err)
2579 				return err;
2580 		} else {
2581 			return -EOPNOTSUPP;
2582 		}
2583 	}
2584 	return 0;
2585 }
2586 
2587 static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = {
2588 	[IFLA_PROTO_DOWN_REASON_MASK]	= { .type = NLA_U32 },
2589 	[IFLA_PROTO_DOWN_REASON_VALUE]	= { .type = NLA_U32 },
2590 };
2591 
do_set_proto_down(struct net_device * dev,struct nlattr * nl_proto_down,struct nlattr * nl_proto_down_reason,struct netlink_ext_ack * extack)2592 static int do_set_proto_down(struct net_device *dev,
2593 			     struct nlattr *nl_proto_down,
2594 			     struct nlattr *nl_proto_down_reason,
2595 			     struct netlink_ext_ack *extack)
2596 {
2597 	struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1];
2598 	unsigned long mask = 0;
2599 	u32 value;
2600 	bool proto_down;
2601 	int err;
2602 
2603 	if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN)) {
2604 		NL_SET_ERR_MSG(extack,  "Protodown not supported by device");
2605 		return -EOPNOTSUPP;
2606 	}
2607 
2608 	if (nl_proto_down_reason) {
2609 		err = nla_parse_nested_deprecated(pdreason,
2610 						  IFLA_PROTO_DOWN_REASON_MAX,
2611 						  nl_proto_down_reason,
2612 						  ifla_proto_down_reason_policy,
2613 						  NULL);
2614 		if (err < 0)
2615 			return err;
2616 
2617 		if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) {
2618 			NL_SET_ERR_MSG(extack, "Invalid protodown reason value");
2619 			return -EINVAL;
2620 		}
2621 
2622 		value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]);
2623 
2624 		if (pdreason[IFLA_PROTO_DOWN_REASON_MASK])
2625 			mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]);
2626 
2627 		dev_change_proto_down_reason(dev, mask, value);
2628 	}
2629 
2630 	if (nl_proto_down) {
2631 		proto_down = nla_get_u8(nl_proto_down);
2632 
2633 		/* Don't turn off protodown if there are active reasons */
2634 		if (!proto_down && dev->proto_down_reason) {
2635 			NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons");
2636 			return -EBUSY;
2637 		}
2638 		err = dev_change_proto_down(dev,
2639 					    proto_down);
2640 		if (err)
2641 			return err;
2642 	}
2643 
2644 	return 0;
2645 }
2646 
2647 #define DO_SETLINK_MODIFIED	0x01
2648 /* notify flag means notify + modified. */
2649 #define DO_SETLINK_NOTIFY	0x03
do_setlink(const struct sk_buff * skb,struct net_device * dev,struct ifinfomsg * ifm,struct netlink_ext_ack * extack,struct nlattr ** tb,int status)2650 static int do_setlink(const struct sk_buff *skb,
2651 		      struct net_device *dev, struct ifinfomsg *ifm,
2652 		      struct netlink_ext_ack *extack,
2653 		      struct nlattr **tb, int status)
2654 {
2655 	const struct net_device_ops *ops = dev->netdev_ops;
2656 	char ifname[IFNAMSIZ];
2657 	int err;
2658 
2659 	err = validate_linkmsg(dev, tb, extack);
2660 	if (err < 0)
2661 		return err;
2662 
2663 	if (tb[IFLA_IFNAME])
2664 		nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2665 	else
2666 		ifname[0] = '\0';
2667 
2668 	if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2669 		const char *pat = ifname[0] ? ifname : NULL;
2670 		struct net *net;
2671 		int new_ifindex;
2672 
2673 		net = rtnl_link_get_net_capable(skb, dev_net(dev),
2674 						tb, CAP_NET_ADMIN);
2675 		if (IS_ERR(net)) {
2676 			err = PTR_ERR(net);
2677 			goto errout;
2678 		}
2679 
2680 		if (tb[IFLA_NEW_IFINDEX])
2681 			new_ifindex = nla_get_s32(tb[IFLA_NEW_IFINDEX]);
2682 		else
2683 			new_ifindex = 0;
2684 
2685 		err = __dev_change_net_namespace(dev, net, pat, new_ifindex);
2686 		put_net(net);
2687 		if (err)
2688 			goto errout;
2689 		status |= DO_SETLINK_MODIFIED;
2690 	}
2691 
2692 	if (tb[IFLA_MAP]) {
2693 		struct rtnl_link_ifmap *u_map;
2694 		struct ifmap k_map;
2695 
2696 		if (!ops->ndo_set_config) {
2697 			err = -EOPNOTSUPP;
2698 			goto errout;
2699 		}
2700 
2701 		if (!netif_device_present(dev)) {
2702 			err = -ENODEV;
2703 			goto errout;
2704 		}
2705 
2706 		u_map = nla_data(tb[IFLA_MAP]);
2707 		k_map.mem_start = (unsigned long) u_map->mem_start;
2708 		k_map.mem_end = (unsigned long) u_map->mem_end;
2709 		k_map.base_addr = (unsigned short) u_map->base_addr;
2710 		k_map.irq = (unsigned char) u_map->irq;
2711 		k_map.dma = (unsigned char) u_map->dma;
2712 		k_map.port = (unsigned char) u_map->port;
2713 
2714 		err = ops->ndo_set_config(dev, &k_map);
2715 		if (err < 0)
2716 			goto errout;
2717 
2718 		status |= DO_SETLINK_NOTIFY;
2719 	}
2720 
2721 	if (tb[IFLA_ADDRESS]) {
2722 		struct sockaddr *sa;
2723 		int len;
2724 
2725 		len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2726 						  sizeof(*sa));
2727 		sa = kmalloc(len, GFP_KERNEL);
2728 		if (!sa) {
2729 			err = -ENOMEM;
2730 			goto errout;
2731 		}
2732 		sa->sa_family = dev->type;
2733 		memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2734 		       dev->addr_len);
2735 		err = dev_set_mac_address_user(dev, sa, extack);
2736 		kfree(sa);
2737 		if (err)
2738 			goto errout;
2739 		status |= DO_SETLINK_MODIFIED;
2740 	}
2741 
2742 	if (tb[IFLA_MTU]) {
2743 		err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2744 		if (err < 0)
2745 			goto errout;
2746 		status |= DO_SETLINK_MODIFIED;
2747 	}
2748 
2749 	if (tb[IFLA_GROUP]) {
2750 		dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2751 		status |= DO_SETLINK_NOTIFY;
2752 	}
2753 
2754 	/*
2755 	 * Interface selected by interface index but interface
2756 	 * name provided implies that a name change has been
2757 	 * requested.
2758 	 */
2759 	if (ifm->ifi_index > 0 && ifname[0]) {
2760 		err = dev_change_name(dev, ifname);
2761 		if (err < 0)
2762 			goto errout;
2763 		status |= DO_SETLINK_MODIFIED;
2764 	}
2765 
2766 	if (tb[IFLA_IFALIAS]) {
2767 		err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2768 				    nla_len(tb[IFLA_IFALIAS]));
2769 		if (err < 0)
2770 			goto errout;
2771 		status |= DO_SETLINK_NOTIFY;
2772 	}
2773 
2774 	if (tb[IFLA_BROADCAST]) {
2775 		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2776 		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2777 	}
2778 
2779 	if (ifm->ifi_flags || ifm->ifi_change) {
2780 		err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2781 				       extack);
2782 		if (err < 0)
2783 			goto errout;
2784 	}
2785 
2786 	if (tb[IFLA_MASTER]) {
2787 		err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2788 		if (err)
2789 			goto errout;
2790 		status |= DO_SETLINK_MODIFIED;
2791 	}
2792 
2793 	if (tb[IFLA_CARRIER]) {
2794 		err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2795 		if (err)
2796 			goto errout;
2797 		status |= DO_SETLINK_MODIFIED;
2798 	}
2799 
2800 	if (tb[IFLA_TXQLEN]) {
2801 		unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2802 
2803 		err = dev_change_tx_queue_len(dev, value);
2804 		if (err)
2805 			goto errout;
2806 		status |= DO_SETLINK_MODIFIED;
2807 	}
2808 
2809 	if (tb[IFLA_GSO_MAX_SIZE]) {
2810 		u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2811 
2812 		if (max_size > dev->tso_max_size) {
2813 			err = -EINVAL;
2814 			goto errout;
2815 		}
2816 
2817 		if (dev->gso_max_size ^ max_size) {
2818 			netif_set_gso_max_size(dev, max_size);
2819 			status |= DO_SETLINK_MODIFIED;
2820 		}
2821 	}
2822 
2823 	if (tb[IFLA_GSO_MAX_SEGS]) {
2824 		u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2825 
2826 		if (max_segs > GSO_MAX_SEGS || max_segs > dev->tso_max_segs) {
2827 			err = -EINVAL;
2828 			goto errout;
2829 		}
2830 
2831 		if (dev->gso_max_segs ^ max_segs) {
2832 			netif_set_gso_max_segs(dev, max_segs);
2833 			status |= DO_SETLINK_MODIFIED;
2834 		}
2835 	}
2836 
2837 	if (tb[IFLA_GRO_MAX_SIZE]) {
2838 		u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_MAX_SIZE]);
2839 
2840 		if (dev->gro_max_size ^ gro_max_size) {
2841 			netif_set_gro_max_size(dev, gro_max_size);
2842 			status |= DO_SETLINK_MODIFIED;
2843 		}
2844 	}
2845 
2846 	if (tb[IFLA_OPERSTATE])
2847 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2848 
2849 	if (tb[IFLA_LINKMODE]) {
2850 		unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2851 
2852 		write_lock(&dev_base_lock);
2853 		if (dev->link_mode ^ value)
2854 			status |= DO_SETLINK_NOTIFY;
2855 		dev->link_mode = value;
2856 		write_unlock(&dev_base_lock);
2857 	}
2858 
2859 	if (tb[IFLA_VFINFO_LIST]) {
2860 		struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2861 		struct nlattr *attr;
2862 		int rem;
2863 
2864 		nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2865 			if (nla_type(attr) != IFLA_VF_INFO ||
2866 			    nla_len(attr) < NLA_HDRLEN) {
2867 				err = -EINVAL;
2868 				goto errout;
2869 			}
2870 			err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
2871 							  attr,
2872 							  ifla_vf_policy,
2873 							  NULL);
2874 			if (err < 0)
2875 				goto errout;
2876 			err = do_setvfinfo(dev, vfinfo);
2877 			if (err < 0)
2878 				goto errout;
2879 			status |= DO_SETLINK_NOTIFY;
2880 		}
2881 	}
2882 	err = 0;
2883 
2884 	if (tb[IFLA_VF_PORTS]) {
2885 		struct nlattr *port[IFLA_PORT_MAX+1];
2886 		struct nlattr *attr;
2887 		int vf;
2888 		int rem;
2889 
2890 		err = -EOPNOTSUPP;
2891 		if (!ops->ndo_set_vf_port)
2892 			goto errout;
2893 
2894 		nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2895 			if (nla_type(attr) != IFLA_VF_PORT ||
2896 			    nla_len(attr) < NLA_HDRLEN) {
2897 				err = -EINVAL;
2898 				goto errout;
2899 			}
2900 			err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2901 							  attr,
2902 							  ifla_port_policy,
2903 							  NULL);
2904 			if (err < 0)
2905 				goto errout;
2906 			if (!port[IFLA_PORT_VF]) {
2907 				err = -EOPNOTSUPP;
2908 				goto errout;
2909 			}
2910 			vf = nla_get_u32(port[IFLA_PORT_VF]);
2911 			err = ops->ndo_set_vf_port(dev, vf, port);
2912 			if (err < 0)
2913 				goto errout;
2914 			status |= DO_SETLINK_NOTIFY;
2915 		}
2916 	}
2917 	err = 0;
2918 
2919 	if (tb[IFLA_PORT_SELF]) {
2920 		struct nlattr *port[IFLA_PORT_MAX+1];
2921 
2922 		err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2923 						  tb[IFLA_PORT_SELF],
2924 						  ifla_port_policy, NULL);
2925 		if (err < 0)
2926 			goto errout;
2927 
2928 		err = -EOPNOTSUPP;
2929 		if (ops->ndo_set_vf_port)
2930 			err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2931 		if (err < 0)
2932 			goto errout;
2933 		status |= DO_SETLINK_NOTIFY;
2934 	}
2935 
2936 	if (tb[IFLA_AF_SPEC]) {
2937 		struct nlattr *af;
2938 		int rem;
2939 
2940 		nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2941 			const struct rtnl_af_ops *af_ops;
2942 
2943 			BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2944 
2945 			err = af_ops->set_link_af(dev, af, extack);
2946 			if (err < 0)
2947 				goto errout;
2948 
2949 			status |= DO_SETLINK_NOTIFY;
2950 		}
2951 	}
2952 	err = 0;
2953 
2954 	if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) {
2955 		err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN],
2956 					tb[IFLA_PROTO_DOWN_REASON], extack);
2957 		if (err)
2958 			goto errout;
2959 		status |= DO_SETLINK_NOTIFY;
2960 	}
2961 
2962 	if (tb[IFLA_XDP]) {
2963 		struct nlattr *xdp[IFLA_XDP_MAX + 1];
2964 		u32 xdp_flags = 0;
2965 
2966 		err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
2967 						  tb[IFLA_XDP],
2968 						  ifla_xdp_policy, NULL);
2969 		if (err < 0)
2970 			goto errout;
2971 
2972 		if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2973 			err = -EINVAL;
2974 			goto errout;
2975 		}
2976 
2977 		if (xdp[IFLA_XDP_FLAGS]) {
2978 			xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2979 			if (xdp_flags & ~XDP_FLAGS_MASK) {
2980 				err = -EINVAL;
2981 				goto errout;
2982 			}
2983 			if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2984 				err = -EINVAL;
2985 				goto errout;
2986 			}
2987 		}
2988 
2989 		if (xdp[IFLA_XDP_FD]) {
2990 			int expected_fd = -1;
2991 
2992 			if (xdp_flags & XDP_FLAGS_REPLACE) {
2993 				if (!xdp[IFLA_XDP_EXPECTED_FD]) {
2994 					err = -EINVAL;
2995 					goto errout;
2996 				}
2997 				expected_fd =
2998 					nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]);
2999 			}
3000 
3001 			err = dev_change_xdp_fd(dev, extack,
3002 						nla_get_s32(xdp[IFLA_XDP_FD]),
3003 						expected_fd,
3004 						xdp_flags);
3005 			if (err)
3006 				goto errout;
3007 			status |= DO_SETLINK_NOTIFY;
3008 		}
3009 	}
3010 
3011 errout:
3012 	if (status & DO_SETLINK_MODIFIED) {
3013 		if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
3014 			netdev_state_change(dev);
3015 
3016 		if (err < 0)
3017 			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",
3018 					     dev->name);
3019 	}
3020 
3021 	return err;
3022 }
3023 
rtnl_dev_get(struct net * net,struct nlattr * tb[])3024 static struct net_device *rtnl_dev_get(struct net *net,
3025 				       struct nlattr *tb[])
3026 {
3027 	char ifname[ALTIFNAMSIZ];
3028 
3029 	if (tb[IFLA_IFNAME])
3030 		nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3031 	else if (tb[IFLA_ALT_IFNAME])
3032 		nla_strscpy(ifname, tb[IFLA_ALT_IFNAME], ALTIFNAMSIZ);
3033 	else
3034 		return NULL;
3035 
3036 	return __dev_get_by_name(net, ifname);
3037 }
3038 
rtnl_setlink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3039 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3040 			struct netlink_ext_ack *extack)
3041 {
3042 	struct net *net = sock_net(skb->sk);
3043 	struct ifinfomsg *ifm;
3044 	struct net_device *dev;
3045 	int err;
3046 	struct nlattr *tb[IFLA_MAX+1];
3047 
3048 	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3049 				     ifla_policy, extack);
3050 	if (err < 0)
3051 		goto errout;
3052 
3053 	err = rtnl_ensure_unique_netns(tb, extack, false);
3054 	if (err < 0)
3055 		goto errout;
3056 
3057 	err = -EINVAL;
3058 	ifm = nlmsg_data(nlh);
3059 	if (ifm->ifi_index > 0)
3060 		dev = __dev_get_by_index(net, ifm->ifi_index);
3061 	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3062 		dev = rtnl_dev_get(net, tb);
3063 	else
3064 		goto errout;
3065 
3066 	if (dev == NULL) {
3067 		err = -ENODEV;
3068 		goto errout;
3069 	}
3070 
3071 	err = do_setlink(skb, dev, ifm, extack, tb, 0);
3072 errout:
3073 	return err;
3074 }
3075 
rtnl_group_dellink(const struct net * net,int group)3076 static int rtnl_group_dellink(const struct net *net, int group)
3077 {
3078 	struct net_device *dev, *aux;
3079 	LIST_HEAD(list_kill);
3080 	bool found = false;
3081 
3082 	if (!group)
3083 		return -EPERM;
3084 
3085 	for_each_netdev(net, dev) {
3086 		if (dev->group == group) {
3087 			const struct rtnl_link_ops *ops;
3088 
3089 			found = true;
3090 			ops = dev->rtnl_link_ops;
3091 			if (!ops || !ops->dellink)
3092 				return -EOPNOTSUPP;
3093 		}
3094 	}
3095 
3096 	if (!found)
3097 		return -ENODEV;
3098 
3099 	for_each_netdev_safe(net, dev, aux) {
3100 		if (dev->group == group) {
3101 			const struct rtnl_link_ops *ops;
3102 
3103 			ops = dev->rtnl_link_ops;
3104 			ops->dellink(dev, &list_kill);
3105 		}
3106 	}
3107 	unregister_netdevice_many(&list_kill);
3108 
3109 	return 0;
3110 }
3111 
rtnl_delete_link(struct net_device * dev)3112 int rtnl_delete_link(struct net_device *dev)
3113 {
3114 	const struct rtnl_link_ops *ops;
3115 	LIST_HEAD(list_kill);
3116 
3117 	ops = dev->rtnl_link_ops;
3118 	if (!ops || !ops->dellink)
3119 		return -EOPNOTSUPP;
3120 
3121 	ops->dellink(dev, &list_kill);
3122 	unregister_netdevice_many(&list_kill);
3123 
3124 	return 0;
3125 }
3126 EXPORT_SYMBOL_GPL(rtnl_delete_link);
3127 
rtnl_dellink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3128 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
3129 			struct netlink_ext_ack *extack)
3130 {
3131 	struct net *net = sock_net(skb->sk);
3132 	struct net *tgt_net = net;
3133 	struct net_device *dev = NULL;
3134 	struct ifinfomsg *ifm;
3135 	struct nlattr *tb[IFLA_MAX+1];
3136 	int err;
3137 	int netnsid = -1;
3138 
3139 	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3140 				     ifla_policy, extack);
3141 	if (err < 0)
3142 		return err;
3143 
3144 	err = rtnl_ensure_unique_netns(tb, extack, true);
3145 	if (err < 0)
3146 		return err;
3147 
3148 	if (tb[IFLA_TARGET_NETNSID]) {
3149 		netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3150 		tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3151 		if (IS_ERR(tgt_net))
3152 			return PTR_ERR(tgt_net);
3153 	}
3154 
3155 	err = -EINVAL;
3156 	ifm = nlmsg_data(nlh);
3157 	if (ifm->ifi_index > 0)
3158 		dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3159 	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3160 		dev = rtnl_dev_get(net, tb);
3161 	else if (tb[IFLA_GROUP])
3162 		err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
3163 	else
3164 		goto out;
3165 
3166 	if (!dev) {
3167 		if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME] || ifm->ifi_index > 0)
3168 			err = -ENODEV;
3169 
3170 		goto out;
3171 	}
3172 
3173 	err = rtnl_delete_link(dev);
3174 
3175 out:
3176 	if (netnsid >= 0)
3177 		put_net(tgt_net);
3178 
3179 	return err;
3180 }
3181 
rtnl_configure_link(struct net_device * dev,const struct ifinfomsg * ifm)3182 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
3183 {
3184 	unsigned int old_flags;
3185 	int err;
3186 
3187 	old_flags = dev->flags;
3188 	if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
3189 		err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
3190 					 NULL);
3191 		if (err < 0)
3192 			return err;
3193 	}
3194 
3195 	if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
3196 		__dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
3197 	} else {
3198 		dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
3199 		__dev_notify_flags(dev, old_flags, ~0U);
3200 	}
3201 	return 0;
3202 }
3203 EXPORT_SYMBOL(rtnl_configure_link);
3204 
rtnl_create_link(struct net * net,const char * ifname,unsigned char name_assign_type,const struct rtnl_link_ops * ops,struct nlattr * tb[],struct netlink_ext_ack * extack)3205 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
3206 				    unsigned char name_assign_type,
3207 				    const struct rtnl_link_ops *ops,
3208 				    struct nlattr *tb[],
3209 				    struct netlink_ext_ack *extack)
3210 {
3211 	struct net_device *dev;
3212 	unsigned int num_tx_queues = 1;
3213 	unsigned int num_rx_queues = 1;
3214 
3215 	if (tb[IFLA_NUM_TX_QUEUES])
3216 		num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
3217 	else if (ops->get_num_tx_queues)
3218 		num_tx_queues = ops->get_num_tx_queues();
3219 
3220 	if (tb[IFLA_NUM_RX_QUEUES])
3221 		num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
3222 	else if (ops->get_num_rx_queues)
3223 		num_rx_queues = ops->get_num_rx_queues();
3224 
3225 	if (num_tx_queues < 1 || num_tx_queues > 4096) {
3226 		NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
3227 		return ERR_PTR(-EINVAL);
3228 	}
3229 
3230 	if (num_rx_queues < 1 || num_rx_queues > 4096) {
3231 		NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
3232 		return ERR_PTR(-EINVAL);
3233 	}
3234 
3235 	if (ops->alloc) {
3236 		dev = ops->alloc(tb, ifname, name_assign_type,
3237 				 num_tx_queues, num_rx_queues);
3238 		if (IS_ERR(dev))
3239 			return dev;
3240 	} else {
3241 		dev = alloc_netdev_mqs(ops->priv_size, ifname,
3242 				       name_assign_type, ops->setup,
3243 				       num_tx_queues, num_rx_queues);
3244 	}
3245 
3246 	if (!dev)
3247 		return ERR_PTR(-ENOMEM);
3248 
3249 	dev_net_set(dev, net);
3250 	dev->rtnl_link_ops = ops;
3251 	dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
3252 
3253 	if (tb[IFLA_MTU]) {
3254 		u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3255 		int err;
3256 
3257 		err = dev_validate_mtu(dev, mtu, extack);
3258 		if (err) {
3259 			free_netdev(dev);
3260 			return ERR_PTR(err);
3261 		}
3262 		dev->mtu = mtu;
3263 	}
3264 	if (tb[IFLA_ADDRESS]) {
3265 		__dev_addr_set(dev, nla_data(tb[IFLA_ADDRESS]),
3266 			       nla_len(tb[IFLA_ADDRESS]));
3267 		dev->addr_assign_type = NET_ADDR_SET;
3268 	}
3269 	if (tb[IFLA_BROADCAST])
3270 		memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
3271 				nla_len(tb[IFLA_BROADCAST]));
3272 	if (tb[IFLA_TXQLEN])
3273 		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
3274 	if (tb[IFLA_OPERSTATE])
3275 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
3276 	if (tb[IFLA_LINKMODE])
3277 		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
3278 	if (tb[IFLA_GROUP])
3279 		dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
3280 	if (tb[IFLA_GSO_MAX_SIZE])
3281 		netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
3282 	if (tb[IFLA_GSO_MAX_SEGS])
3283 		netif_set_gso_max_segs(dev, nla_get_u32(tb[IFLA_GSO_MAX_SEGS]));
3284 	if (tb[IFLA_GRO_MAX_SIZE])
3285 		netif_set_gro_max_size(dev, nla_get_u32(tb[IFLA_GRO_MAX_SIZE]));
3286 
3287 	return dev;
3288 }
3289 EXPORT_SYMBOL(rtnl_create_link);
3290 
rtnl_group_changelink(const struct sk_buff * skb,struct net * net,int group,struct ifinfomsg * ifm,struct netlink_ext_ack * extack,struct nlattr ** tb)3291 static int rtnl_group_changelink(const struct sk_buff *skb,
3292 		struct net *net, int group,
3293 		struct ifinfomsg *ifm,
3294 		struct netlink_ext_ack *extack,
3295 		struct nlattr **tb)
3296 {
3297 	struct net_device *dev, *aux;
3298 	int err;
3299 
3300 	for_each_netdev_safe(net, dev, aux) {
3301 		if (dev->group == group) {
3302 			err = do_setlink(skb, dev, ifm, extack, tb, 0);
3303 			if (err < 0)
3304 				return err;
3305 		}
3306 	}
3307 
3308 	return 0;
3309 }
3310 
rtnl_newlink_create(struct sk_buff * skb,struct ifinfomsg * ifm,const struct rtnl_link_ops * ops,struct nlattr ** tb,struct nlattr ** data,struct netlink_ext_ack * extack)3311 static int rtnl_newlink_create(struct sk_buff *skb, struct ifinfomsg *ifm,
3312 			       const struct rtnl_link_ops *ops,
3313 			       struct nlattr **tb, struct nlattr **data,
3314 			       struct netlink_ext_ack *extack)
3315 {
3316 	unsigned char name_assign_type = NET_NAME_USER;
3317 	struct net *net = sock_net(skb->sk);
3318 	struct net *dest_net, *link_net;
3319 	struct net_device *dev;
3320 	char ifname[IFNAMSIZ];
3321 	int err;
3322 
3323 	if (!ops->alloc && !ops->setup)
3324 		return -EOPNOTSUPP;
3325 
3326 	if (tb[IFLA_IFNAME]) {
3327 		nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3328 	} else {
3329 		snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3330 		name_assign_type = NET_NAME_ENUM;
3331 	}
3332 
3333 	dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3334 	if (IS_ERR(dest_net))
3335 		return PTR_ERR(dest_net);
3336 
3337 	if (tb[IFLA_LINK_NETNSID]) {
3338 		int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3339 
3340 		link_net = get_net_ns_by_id(dest_net, id);
3341 		if (!link_net) {
3342 			NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3343 			err =  -EINVAL;
3344 			goto out;
3345 		}
3346 		err = -EPERM;
3347 		if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3348 			goto out;
3349 	} else {
3350 		link_net = NULL;
3351 	}
3352 
3353 	dev = rtnl_create_link(link_net ? : dest_net, ifname,
3354 			       name_assign_type, ops, tb, extack);
3355 	if (IS_ERR(dev)) {
3356 		err = PTR_ERR(dev);
3357 		goto out;
3358 	}
3359 
3360 	dev->ifindex = ifm->ifi_index;
3361 
3362 	if (ops->newlink)
3363 		err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3364 	else
3365 		err = register_netdevice(dev);
3366 	if (err < 0) {
3367 		free_netdev(dev);
3368 		goto out;
3369 	}
3370 
3371 	err = rtnl_configure_link(dev, ifm);
3372 	if (err < 0)
3373 		goto out_unregister;
3374 	if (link_net) {
3375 		err = dev_change_net_namespace(dev, dest_net, ifname);
3376 		if (err < 0)
3377 			goto out_unregister;
3378 	}
3379 	if (tb[IFLA_MASTER]) {
3380 		err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3381 		if (err)
3382 			goto out_unregister;
3383 	}
3384 out:
3385 	if (link_net)
3386 		put_net(link_net);
3387 	put_net(dest_net);
3388 	return err;
3389 out_unregister:
3390 	if (ops->newlink) {
3391 		LIST_HEAD(list_kill);
3392 
3393 		ops->dellink(dev, &list_kill);
3394 		unregister_netdevice_many(&list_kill);
3395 	} else {
3396 		unregister_netdevice(dev);
3397 	}
3398 	goto out;
3399 }
3400 
3401 struct rtnl_newlink_tbs {
3402 	struct nlattr *tb[IFLA_MAX + 1];
3403 	struct nlattr *attr[RTNL_MAX_TYPE + 1];
3404 	struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3405 };
3406 
__rtnl_newlink(struct sk_buff * skb,struct nlmsghdr * nlh,struct rtnl_newlink_tbs * tbs,struct netlink_ext_ack * extack)3407 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3408 			  struct rtnl_newlink_tbs *tbs,
3409 			  struct netlink_ext_ack *extack)
3410 {
3411 	struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
3412 	struct nlattr ** const tb = tbs->tb;
3413 	const struct rtnl_link_ops *m_ops;
3414 	struct net_device *master_dev;
3415 	struct net *net = sock_net(skb->sk);
3416 	const struct rtnl_link_ops *ops;
3417 	struct nlattr **slave_data;
3418 	char kind[MODULE_NAME_LEN];
3419 	struct net_device *dev;
3420 	struct ifinfomsg *ifm;
3421 	struct nlattr **data;
3422 	bool link_specified;
3423 	int err;
3424 
3425 #ifdef CONFIG_MODULES
3426 replay:
3427 #endif
3428 	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3429 				     ifla_policy, extack);
3430 	if (err < 0)
3431 		return err;
3432 
3433 	err = rtnl_ensure_unique_netns(tb, extack, false);
3434 	if (err < 0)
3435 		return err;
3436 
3437 	ifm = nlmsg_data(nlh);
3438 	if (ifm->ifi_index > 0) {
3439 		link_specified = true;
3440 		dev = __dev_get_by_index(net, ifm->ifi_index);
3441 	} else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) {
3442 		link_specified = true;
3443 		dev = rtnl_dev_get(net, tb);
3444 	} else {
3445 		link_specified = false;
3446 		dev = NULL;
3447 	}
3448 
3449 	master_dev = NULL;
3450 	m_ops = NULL;
3451 	if (dev) {
3452 		master_dev = netdev_master_upper_dev_get(dev);
3453 		if (master_dev)
3454 			m_ops = master_dev->rtnl_link_ops;
3455 	}
3456 
3457 	err = validate_linkmsg(dev, tb, extack);
3458 	if (err < 0)
3459 		return err;
3460 
3461 	if (tb[IFLA_LINKINFO]) {
3462 		err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3463 						  tb[IFLA_LINKINFO],
3464 						  ifla_info_policy, NULL);
3465 		if (err < 0)
3466 			return err;
3467 	} else
3468 		memset(linkinfo, 0, sizeof(linkinfo));
3469 
3470 	if (linkinfo[IFLA_INFO_KIND]) {
3471 		nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3472 		ops = rtnl_link_ops_get(kind);
3473 	} else {
3474 		kind[0] = '\0';
3475 		ops = NULL;
3476 	}
3477 
3478 	data = NULL;
3479 	if (ops) {
3480 		if (ops->maxtype > RTNL_MAX_TYPE)
3481 			return -EINVAL;
3482 
3483 		if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3484 			err = nla_parse_nested_deprecated(tbs->attr, ops->maxtype,
3485 							  linkinfo[IFLA_INFO_DATA],
3486 							  ops->policy, extack);
3487 			if (err < 0)
3488 				return err;
3489 			data = tbs->attr;
3490 		}
3491 		if (ops->validate) {
3492 			err = ops->validate(tb, data, extack);
3493 			if (err < 0)
3494 				return err;
3495 		}
3496 	}
3497 
3498 	slave_data = NULL;
3499 	if (m_ops) {
3500 		if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3501 			return -EINVAL;
3502 
3503 		if (m_ops->slave_maxtype &&
3504 		    linkinfo[IFLA_INFO_SLAVE_DATA]) {
3505 			err = nla_parse_nested_deprecated(tbs->slave_attr,
3506 							  m_ops->slave_maxtype,
3507 							  linkinfo[IFLA_INFO_SLAVE_DATA],
3508 							  m_ops->slave_policy,
3509 							  extack);
3510 			if (err < 0)
3511 				return err;
3512 			slave_data = tbs->slave_attr;
3513 		}
3514 	}
3515 
3516 	if (dev) {
3517 		int status = 0;
3518 
3519 		if (nlh->nlmsg_flags & NLM_F_EXCL)
3520 			return -EEXIST;
3521 		if (nlh->nlmsg_flags & NLM_F_REPLACE)
3522 			return -EOPNOTSUPP;
3523 
3524 		if (linkinfo[IFLA_INFO_DATA]) {
3525 			if (!ops || ops != dev->rtnl_link_ops ||
3526 			    !ops->changelink)
3527 				return -EOPNOTSUPP;
3528 
3529 			err = ops->changelink(dev, tb, data, extack);
3530 			if (err < 0)
3531 				return err;
3532 			status |= DO_SETLINK_NOTIFY;
3533 		}
3534 
3535 		if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3536 			if (!m_ops || !m_ops->slave_changelink)
3537 				return -EOPNOTSUPP;
3538 
3539 			err = m_ops->slave_changelink(master_dev, dev, tb,
3540 						      slave_data, extack);
3541 			if (err < 0)
3542 				return err;
3543 			status |= DO_SETLINK_NOTIFY;
3544 		}
3545 
3546 		return do_setlink(skb, dev, ifm, extack, tb, status);
3547 	}
3548 
3549 	if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3550 		/* No dev found and NLM_F_CREATE not set. Requested dev does not exist,
3551 		 * or it's for a group
3552 		*/
3553 		if (link_specified)
3554 			return -ENODEV;
3555 		if (tb[IFLA_GROUP])
3556 			return rtnl_group_changelink(skb, net,
3557 						nla_get_u32(tb[IFLA_GROUP]),
3558 						ifm, extack, tb);
3559 		return -ENODEV;
3560 	}
3561 
3562 	if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3563 		return -EOPNOTSUPP;
3564 
3565 	if (!ops) {
3566 #ifdef CONFIG_MODULES
3567 		if (kind[0]) {
3568 			__rtnl_unlock();
3569 			request_module("rtnl-link-%s", kind);
3570 			rtnl_lock();
3571 			ops = rtnl_link_ops_get(kind);
3572 			if (ops)
3573 				goto replay;
3574 		}
3575 #endif
3576 		NL_SET_ERR_MSG(extack, "Unknown device type");
3577 		return -EOPNOTSUPP;
3578 	}
3579 
3580 	return rtnl_newlink_create(skb, ifm, ops, tb, data, extack);
3581 }
3582 
rtnl_newlink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3583 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3584 			struct netlink_ext_ack *extack)
3585 {
3586 	struct rtnl_newlink_tbs *tbs;
3587 	int ret;
3588 
3589 	tbs = kmalloc(sizeof(*tbs), GFP_KERNEL);
3590 	if (!tbs)
3591 		return -ENOMEM;
3592 
3593 	ret = __rtnl_newlink(skb, nlh, tbs, extack);
3594 	kfree(tbs);
3595 	return ret;
3596 }
3597 
rtnl_valid_getlink_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)3598 static int rtnl_valid_getlink_req(struct sk_buff *skb,
3599 				  const struct nlmsghdr *nlh,
3600 				  struct nlattr **tb,
3601 				  struct netlink_ext_ack *extack)
3602 {
3603 	struct ifinfomsg *ifm;
3604 	int i, err;
3605 
3606 	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3607 		NL_SET_ERR_MSG(extack, "Invalid header for get link");
3608 		return -EINVAL;
3609 	}
3610 
3611 	if (!netlink_strict_get_check(skb))
3612 		return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3613 					      ifla_policy, extack);
3614 
3615 	ifm = nlmsg_data(nlh);
3616 	if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3617 	    ifm->ifi_change) {
3618 		NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3619 		return -EINVAL;
3620 	}
3621 
3622 	err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3623 					    ifla_policy, extack);
3624 	if (err)
3625 		return err;
3626 
3627 	for (i = 0; i <= IFLA_MAX; i++) {
3628 		if (!tb[i])
3629 			continue;
3630 
3631 		switch (i) {
3632 		case IFLA_IFNAME:
3633 		case IFLA_ALT_IFNAME:
3634 		case IFLA_EXT_MASK:
3635 		case IFLA_TARGET_NETNSID:
3636 			break;
3637 		default:
3638 			NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3639 			return -EINVAL;
3640 		}
3641 	}
3642 
3643 	return 0;
3644 }
3645 
rtnl_getlink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3646 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3647 			struct netlink_ext_ack *extack)
3648 {
3649 	struct net *net = sock_net(skb->sk);
3650 	struct net *tgt_net = net;
3651 	struct ifinfomsg *ifm;
3652 	struct nlattr *tb[IFLA_MAX+1];
3653 	struct net_device *dev = NULL;
3654 	struct sk_buff *nskb;
3655 	int netnsid = -1;
3656 	int err;
3657 	u32 ext_filter_mask = 0;
3658 
3659 	err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3660 	if (err < 0)
3661 		return err;
3662 
3663 	err = rtnl_ensure_unique_netns(tb, extack, true);
3664 	if (err < 0)
3665 		return err;
3666 
3667 	if (tb[IFLA_TARGET_NETNSID]) {
3668 		netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3669 		tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3670 		if (IS_ERR(tgt_net))
3671 			return PTR_ERR(tgt_net);
3672 	}
3673 
3674 	if (tb[IFLA_EXT_MASK])
3675 		ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3676 
3677 	err = -EINVAL;
3678 	ifm = nlmsg_data(nlh);
3679 	if (ifm->ifi_index > 0)
3680 		dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3681 	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3682 		dev = rtnl_dev_get(tgt_net, tb);
3683 	else
3684 		goto out;
3685 
3686 	err = -ENODEV;
3687 	if (dev == NULL)
3688 		goto out;
3689 
3690 	err = -ENOBUFS;
3691 	nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3692 	if (nskb == NULL)
3693 		goto out;
3694 
3695 	err = rtnl_fill_ifinfo(nskb, dev, net,
3696 			       RTM_NEWLINK, NETLINK_CB(skb).portid,
3697 			       nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3698 			       0, NULL, 0, netnsid, GFP_KERNEL);
3699 	if (err < 0) {
3700 		/* -EMSGSIZE implies BUG in if_nlmsg_size */
3701 		WARN_ON(err == -EMSGSIZE);
3702 		kfree_skb(nskb);
3703 	} else
3704 		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3705 out:
3706 	if (netnsid >= 0)
3707 		put_net(tgt_net);
3708 
3709 	return err;
3710 }
3711 
rtnl_alt_ifname(int cmd,struct net_device * dev,struct nlattr * attr,bool * changed,struct netlink_ext_ack * extack)3712 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
3713 			   bool *changed, struct netlink_ext_ack *extack)
3714 {
3715 	char *alt_ifname;
3716 	size_t size;
3717 	int err;
3718 
3719 	err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
3720 	if (err)
3721 		return err;
3722 
3723 	if (cmd == RTM_NEWLINKPROP) {
3724 		size = rtnl_prop_list_size(dev);
3725 		size += nla_total_size(ALTIFNAMSIZ);
3726 		if (size >= U16_MAX) {
3727 			NL_SET_ERR_MSG(extack,
3728 				       "effective property list too long");
3729 			return -EINVAL;
3730 		}
3731 	}
3732 
3733 	alt_ifname = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
3734 	if (!alt_ifname)
3735 		return -ENOMEM;
3736 
3737 	if (cmd == RTM_NEWLINKPROP) {
3738 		err = netdev_name_node_alt_create(dev, alt_ifname);
3739 		if (!err)
3740 			alt_ifname = NULL;
3741 	} else if (cmd == RTM_DELLINKPROP) {
3742 		err = netdev_name_node_alt_destroy(dev, alt_ifname);
3743 	} else {
3744 		WARN_ON_ONCE(1);
3745 		err = -EINVAL;
3746 	}
3747 
3748 	kfree(alt_ifname);
3749 	if (!err)
3750 		*changed = true;
3751 	return err;
3752 }
3753 
rtnl_linkprop(int cmd,struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3754 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
3755 			 struct netlink_ext_ack *extack)
3756 {
3757 	struct net *net = sock_net(skb->sk);
3758 	struct nlattr *tb[IFLA_MAX + 1];
3759 	struct net_device *dev;
3760 	struct ifinfomsg *ifm;
3761 	bool changed = false;
3762 	struct nlattr *attr;
3763 	int err, rem;
3764 
3765 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3766 	if (err)
3767 		return err;
3768 
3769 	err = rtnl_ensure_unique_netns(tb, extack, true);
3770 	if (err)
3771 		return err;
3772 
3773 	ifm = nlmsg_data(nlh);
3774 	if (ifm->ifi_index > 0)
3775 		dev = __dev_get_by_index(net, ifm->ifi_index);
3776 	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3777 		dev = rtnl_dev_get(net, tb);
3778 	else
3779 		return -EINVAL;
3780 
3781 	if (!dev)
3782 		return -ENODEV;
3783 
3784 	if (!tb[IFLA_PROP_LIST])
3785 		return 0;
3786 
3787 	nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
3788 		switch (nla_type(attr)) {
3789 		case IFLA_ALT_IFNAME:
3790 			err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
3791 			if (err)
3792 				return err;
3793 			break;
3794 		}
3795 	}
3796 
3797 	if (changed)
3798 		netdev_state_change(dev);
3799 	return 0;
3800 }
3801 
rtnl_newlinkprop(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3802 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3803 			    struct netlink_ext_ack *extack)
3804 {
3805 	return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
3806 }
3807 
rtnl_dellinkprop(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3808 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3809 			    struct netlink_ext_ack *extack)
3810 {
3811 	return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
3812 }
3813 
rtnl_calcit(struct sk_buff * skb,struct nlmsghdr * nlh)3814 static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3815 {
3816 	struct net *net = sock_net(skb->sk);
3817 	size_t min_ifinfo_dump_size = 0;
3818 	struct nlattr *tb[IFLA_MAX+1];
3819 	u32 ext_filter_mask = 0;
3820 	struct net_device *dev;
3821 	int hdrlen;
3822 
3823 	/* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3824 	hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3825 		 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3826 
3827 	if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3828 		if (tb[IFLA_EXT_MASK])
3829 			ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3830 	}
3831 
3832 	if (!ext_filter_mask)
3833 		return NLMSG_GOODSIZE;
3834 	/*
3835 	 * traverse the list of net devices and compute the minimum
3836 	 * buffer size based upon the filter mask.
3837 	 */
3838 	rcu_read_lock();
3839 	for_each_netdev_rcu(net, dev) {
3840 		min_ifinfo_dump_size = max(min_ifinfo_dump_size,
3841 					   if_nlmsg_size(dev, ext_filter_mask));
3842 	}
3843 	rcu_read_unlock();
3844 
3845 	return nlmsg_total_size(min_ifinfo_dump_size);
3846 }
3847 
rtnl_dump_all(struct sk_buff * skb,struct netlink_callback * cb)3848 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3849 {
3850 	int idx;
3851 	int s_idx = cb->family;
3852 	int type = cb->nlh->nlmsg_type - RTM_BASE;
3853 	int ret = 0;
3854 
3855 	if (s_idx == 0)
3856 		s_idx = 1;
3857 
3858 	for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3859 		struct rtnl_link __rcu **tab;
3860 		struct rtnl_link *link;
3861 		rtnl_dumpit_func dumpit;
3862 
3863 		if (idx < s_idx || idx == PF_PACKET)
3864 			continue;
3865 
3866 		if (type < 0 || type >= RTM_NR_MSGTYPES)
3867 			continue;
3868 
3869 		tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3870 		if (!tab)
3871 			continue;
3872 
3873 		link = rcu_dereference_rtnl(tab[type]);
3874 		if (!link)
3875 			continue;
3876 
3877 		dumpit = link->dumpit;
3878 		if (!dumpit)
3879 			continue;
3880 
3881 		if (idx > s_idx) {
3882 			memset(&cb->args[0], 0, sizeof(cb->args));
3883 			cb->prev_seq = 0;
3884 			cb->seq = 0;
3885 		}
3886 		ret = dumpit(skb, cb);
3887 		if (ret)
3888 			break;
3889 	}
3890 	cb->family = idx;
3891 
3892 	return skb->len ? : ret;
3893 }
3894 
rtmsg_ifinfo_build_skb(int type,struct net_device * dev,unsigned int change,u32 event,gfp_t flags,int * new_nsid,int new_ifindex)3895 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3896 				       unsigned int change,
3897 				       u32 event, gfp_t flags, int *new_nsid,
3898 				       int new_ifindex)
3899 {
3900 	struct net *net = dev_net(dev);
3901 	struct sk_buff *skb;
3902 	int err = -ENOBUFS;
3903 
3904 	skb = nlmsg_new(if_nlmsg_size(dev, 0), flags);
3905 	if (skb == NULL)
3906 		goto errout;
3907 
3908 	err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3909 			       type, 0, 0, change, 0, 0, event,
3910 			       new_nsid, new_ifindex, -1, flags);
3911 	if (err < 0) {
3912 		/* -EMSGSIZE implies BUG in if_nlmsg_size() */
3913 		WARN_ON(err == -EMSGSIZE);
3914 		kfree_skb(skb);
3915 		goto errout;
3916 	}
3917 	return skb;
3918 errout:
3919 	if (err < 0)
3920 		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3921 	return NULL;
3922 }
3923 
rtmsg_ifinfo_send(struct sk_buff * skb,struct net_device * dev,gfp_t flags)3924 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3925 {
3926 	struct net *net = dev_net(dev);
3927 
3928 	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3929 }
3930 
rtmsg_ifinfo_event(int type,struct net_device * dev,unsigned int change,u32 event,gfp_t flags,int * new_nsid,int new_ifindex)3931 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3932 			       unsigned int change, u32 event,
3933 			       gfp_t flags, int *new_nsid, int new_ifindex)
3934 {
3935 	struct sk_buff *skb;
3936 
3937 	if (dev->reg_state != NETREG_REGISTERED)
3938 		return;
3939 
3940 	skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3941 				     new_ifindex);
3942 	if (skb)
3943 		rtmsg_ifinfo_send(skb, dev, flags);
3944 }
3945 
rtmsg_ifinfo(int type,struct net_device * dev,unsigned int change,gfp_t flags)3946 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3947 		  gfp_t flags)
3948 {
3949 	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3950 			   NULL, 0);
3951 }
3952 
rtmsg_ifinfo_newnet(int type,struct net_device * dev,unsigned int change,gfp_t flags,int * new_nsid,int new_ifindex)3953 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3954 			 gfp_t flags, int *new_nsid, int new_ifindex)
3955 {
3956 	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3957 			   new_nsid, new_ifindex);
3958 }
3959 
nlmsg_populate_fdb_fill(struct sk_buff * skb,struct net_device * dev,u8 * addr,u16 vid,u32 pid,u32 seq,int type,unsigned int flags,int nlflags,u16 ndm_state)3960 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3961 				   struct net_device *dev,
3962 				   u8 *addr, u16 vid, u32 pid, u32 seq,
3963 				   int type, unsigned int flags,
3964 				   int nlflags, u16 ndm_state)
3965 {
3966 	struct nlmsghdr *nlh;
3967 	struct ndmsg *ndm;
3968 
3969 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3970 	if (!nlh)
3971 		return -EMSGSIZE;
3972 
3973 	ndm = nlmsg_data(nlh);
3974 	ndm->ndm_family  = AF_BRIDGE;
3975 	ndm->ndm_pad1	 = 0;
3976 	ndm->ndm_pad2    = 0;
3977 	ndm->ndm_flags	 = flags;
3978 	ndm->ndm_type	 = 0;
3979 	ndm->ndm_ifindex = dev->ifindex;
3980 	ndm->ndm_state   = ndm_state;
3981 
3982 	if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3983 		goto nla_put_failure;
3984 	if (vid)
3985 		if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3986 			goto nla_put_failure;
3987 
3988 	nlmsg_end(skb, nlh);
3989 	return 0;
3990 
3991 nla_put_failure:
3992 	nlmsg_cancel(skb, nlh);
3993 	return -EMSGSIZE;
3994 }
3995 
rtnl_fdb_nlmsg_size(void)3996 static inline size_t rtnl_fdb_nlmsg_size(void)
3997 {
3998 	return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3999 	       nla_total_size(ETH_ALEN) +	/* NDA_LLADDR */
4000 	       nla_total_size(sizeof(u16)) +	/* NDA_VLAN */
4001 	       0;
4002 }
4003 
rtnl_fdb_notify(struct net_device * dev,u8 * addr,u16 vid,int type,u16 ndm_state)4004 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
4005 			    u16 ndm_state)
4006 {
4007 	struct net *net = dev_net(dev);
4008 	struct sk_buff *skb;
4009 	int err = -ENOBUFS;
4010 
4011 	skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
4012 	if (!skb)
4013 		goto errout;
4014 
4015 	err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
4016 				      0, 0, type, NTF_SELF, 0, ndm_state);
4017 	if (err < 0) {
4018 		kfree_skb(skb);
4019 		goto errout;
4020 	}
4021 
4022 	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
4023 	return;
4024 errout:
4025 	rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
4026 }
4027 
4028 /*
4029  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
4030  */
ndo_dflt_fdb_add(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid,u16 flags)4031 int ndo_dflt_fdb_add(struct ndmsg *ndm,
4032 		     struct nlattr *tb[],
4033 		     struct net_device *dev,
4034 		     const unsigned char *addr, u16 vid,
4035 		     u16 flags)
4036 {
4037 	int err = -EINVAL;
4038 
4039 	/* If aging addresses are supported device will need to
4040 	 * implement its own handler for this.
4041 	 */
4042 	if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
4043 		netdev_info(dev, "default FDB implementation only supports local addresses\n");
4044 		return err;
4045 	}
4046 
4047 	if (vid) {
4048 		netdev_info(dev, "vlans aren't supported yet for dev_uc|mc_add()\n");
4049 		return err;
4050 	}
4051 
4052 	if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
4053 		err = dev_uc_add_excl(dev, addr);
4054 	else if (is_multicast_ether_addr(addr))
4055 		err = dev_mc_add_excl(dev, addr);
4056 
4057 	/* Only return duplicate errors if NLM_F_EXCL is set */
4058 	if (err == -EEXIST && !(flags & NLM_F_EXCL))
4059 		err = 0;
4060 
4061 	return err;
4062 }
4063 EXPORT_SYMBOL(ndo_dflt_fdb_add);
4064 
fdb_vid_parse(struct nlattr * vlan_attr,u16 * p_vid,struct netlink_ext_ack * extack)4065 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
4066 			 struct netlink_ext_ack *extack)
4067 {
4068 	u16 vid = 0;
4069 
4070 	if (vlan_attr) {
4071 		if (nla_len(vlan_attr) != sizeof(u16)) {
4072 			NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
4073 			return -EINVAL;
4074 		}
4075 
4076 		vid = nla_get_u16(vlan_attr);
4077 
4078 		if (!vid || vid >= VLAN_VID_MASK) {
4079 			NL_SET_ERR_MSG(extack, "invalid vlan id");
4080 			return -EINVAL;
4081 		}
4082 	}
4083 	*p_vid = vid;
4084 	return 0;
4085 }
4086 
rtnl_fdb_add(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4087 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
4088 			struct netlink_ext_ack *extack)
4089 {
4090 	struct net *net = sock_net(skb->sk);
4091 	struct ndmsg *ndm;
4092 	struct nlattr *tb[NDA_MAX+1];
4093 	struct net_device *dev;
4094 	u8 *addr;
4095 	u16 vid;
4096 	int err;
4097 
4098 	err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
4099 				     extack);
4100 	if (err < 0)
4101 		return err;
4102 
4103 	ndm = nlmsg_data(nlh);
4104 	if (ndm->ndm_ifindex == 0) {
4105 		NL_SET_ERR_MSG(extack, "invalid ifindex");
4106 		return -EINVAL;
4107 	}
4108 
4109 	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4110 	if (dev == NULL) {
4111 		NL_SET_ERR_MSG(extack, "unknown ifindex");
4112 		return -ENODEV;
4113 	}
4114 
4115 	if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4116 		NL_SET_ERR_MSG(extack, "invalid address");
4117 		return -EINVAL;
4118 	}
4119 
4120 	if (dev->type != ARPHRD_ETHER) {
4121 		NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
4122 		return -EINVAL;
4123 	}
4124 
4125 	addr = nla_data(tb[NDA_LLADDR]);
4126 
4127 	err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4128 	if (err)
4129 		return err;
4130 
4131 	err = -EOPNOTSUPP;
4132 
4133 	/* Support fdb on master device the net/bridge default case */
4134 	if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4135 	    netif_is_bridge_port(dev)) {
4136 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4137 		const struct net_device_ops *ops = br_dev->netdev_ops;
4138 
4139 		err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
4140 				       nlh->nlmsg_flags, extack);
4141 		if (err)
4142 			goto out;
4143 		else
4144 			ndm->ndm_flags &= ~NTF_MASTER;
4145 	}
4146 
4147 	/* Embedded bridge, macvlan, and any other device support */
4148 	if ((ndm->ndm_flags & NTF_SELF)) {
4149 		if (dev->netdev_ops->ndo_fdb_add)
4150 			err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
4151 							   vid,
4152 							   nlh->nlmsg_flags,
4153 							   extack);
4154 		else
4155 			err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
4156 					       nlh->nlmsg_flags);
4157 
4158 		if (!err) {
4159 			rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
4160 					ndm->ndm_state);
4161 			ndm->ndm_flags &= ~NTF_SELF;
4162 		}
4163 	}
4164 out:
4165 	return err;
4166 }
4167 
4168 /*
4169  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
4170  */
ndo_dflt_fdb_del(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid)4171 int ndo_dflt_fdb_del(struct ndmsg *ndm,
4172 		     struct nlattr *tb[],
4173 		     struct net_device *dev,
4174 		     const unsigned char *addr, u16 vid)
4175 {
4176 	int err = -EINVAL;
4177 
4178 	/* If aging addresses are supported device will need to
4179 	 * implement its own handler for this.
4180 	 */
4181 	if (!(ndm->ndm_state & NUD_PERMANENT)) {
4182 		netdev_info(dev, "default FDB implementation only supports local addresses\n");
4183 		return err;
4184 	}
4185 
4186 	if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
4187 		err = dev_uc_del(dev, addr);
4188 	else if (is_multicast_ether_addr(addr))
4189 		err = dev_mc_del(dev, addr);
4190 
4191 	return err;
4192 }
4193 EXPORT_SYMBOL(ndo_dflt_fdb_del);
4194 
4195 static const struct nla_policy fdb_del_bulk_policy[NDA_MAX + 1] = {
4196 	[NDA_VLAN]	= { .type = NLA_U16 },
4197 	[NDA_IFINDEX]	= NLA_POLICY_MIN(NLA_S32, 1),
4198 	[NDA_NDM_STATE_MASK]	= { .type = NLA_U16  },
4199 	[NDA_NDM_FLAGS_MASK]	= { .type = NLA_U8 },
4200 };
4201 
rtnl_fdb_del(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4202 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
4203 			struct netlink_ext_ack *extack)
4204 {
4205 	bool del_bulk = !!(nlh->nlmsg_flags & NLM_F_BULK);
4206 	struct net *net = sock_net(skb->sk);
4207 	const struct net_device_ops *ops;
4208 	struct ndmsg *ndm;
4209 	struct nlattr *tb[NDA_MAX+1];
4210 	struct net_device *dev;
4211 	__u8 *addr = NULL;
4212 	int err;
4213 	u16 vid;
4214 
4215 	if (!netlink_capable(skb, CAP_NET_ADMIN))
4216 		return -EPERM;
4217 
4218 	if (!del_bulk) {
4219 		err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX,
4220 					     NULL, extack);
4221 	} else {
4222 		err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX,
4223 				  fdb_del_bulk_policy, extack);
4224 	}
4225 	if (err < 0)
4226 		return err;
4227 
4228 	ndm = nlmsg_data(nlh);
4229 	if (ndm->ndm_ifindex == 0) {
4230 		NL_SET_ERR_MSG(extack, "invalid ifindex");
4231 		return -EINVAL;
4232 	}
4233 
4234 	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4235 	if (dev == NULL) {
4236 		NL_SET_ERR_MSG(extack, "unknown ifindex");
4237 		return -ENODEV;
4238 	}
4239 
4240 	if (!del_bulk) {
4241 		if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4242 			NL_SET_ERR_MSG(extack, "invalid address");
4243 			return -EINVAL;
4244 		}
4245 		addr = nla_data(tb[NDA_LLADDR]);
4246 	}
4247 
4248 	if (dev->type != ARPHRD_ETHER) {
4249 		NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
4250 		return -EINVAL;
4251 	}
4252 
4253 	err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4254 	if (err)
4255 		return err;
4256 
4257 	err = -EOPNOTSUPP;
4258 
4259 	/* Support fdb on master device the net/bridge default case */
4260 	if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4261 	    netif_is_bridge_port(dev)) {
4262 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4263 
4264 		ops = br_dev->netdev_ops;
4265 		if (!del_bulk) {
4266 			if (ops->ndo_fdb_del)
4267 				err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid, extack);
4268 		} else {
4269 			if (ops->ndo_fdb_del_bulk)
4270 				err = ops->ndo_fdb_del_bulk(ndm, tb, dev, vid,
4271 							    extack);
4272 		}
4273 
4274 		if (err)
4275 			goto out;
4276 		else
4277 			ndm->ndm_flags &= ~NTF_MASTER;
4278 	}
4279 
4280 	/* Embedded bridge, macvlan, and any other device support */
4281 	if (ndm->ndm_flags & NTF_SELF) {
4282 		ops = dev->netdev_ops;
4283 		if (!del_bulk) {
4284 			if (ops->ndo_fdb_del)
4285 				err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid, extack);
4286 			else
4287 				err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
4288 		} else {
4289 			/* in case err was cleared by NTF_MASTER call */
4290 			err = -EOPNOTSUPP;
4291 			if (ops->ndo_fdb_del_bulk)
4292 				err = ops->ndo_fdb_del_bulk(ndm, tb, dev, vid,
4293 							    extack);
4294 		}
4295 
4296 		if (!err) {
4297 			if (!del_bulk)
4298 				rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
4299 						ndm->ndm_state);
4300 			ndm->ndm_flags &= ~NTF_SELF;
4301 		}
4302 	}
4303 out:
4304 	return err;
4305 }
4306 
nlmsg_populate_fdb(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev,int * idx,struct netdev_hw_addr_list * list)4307 static int nlmsg_populate_fdb(struct sk_buff *skb,
4308 			      struct netlink_callback *cb,
4309 			      struct net_device *dev,
4310 			      int *idx,
4311 			      struct netdev_hw_addr_list *list)
4312 {
4313 	struct netdev_hw_addr *ha;
4314 	int err;
4315 	u32 portid, seq;
4316 
4317 	portid = NETLINK_CB(cb->skb).portid;
4318 	seq = cb->nlh->nlmsg_seq;
4319 
4320 	list_for_each_entry(ha, &list->list, list) {
4321 		if (*idx < cb->args[2])
4322 			goto skip;
4323 
4324 		err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
4325 					      portid, seq,
4326 					      RTM_NEWNEIGH, NTF_SELF,
4327 					      NLM_F_MULTI, NUD_PERMANENT);
4328 		if (err < 0)
4329 			return err;
4330 skip:
4331 		*idx += 1;
4332 	}
4333 	return 0;
4334 }
4335 
4336 /**
4337  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
4338  * @skb: socket buffer to store message in
4339  * @cb: netlink callback
4340  * @dev: netdevice
4341  * @filter_dev: ignored
4342  * @idx: the number of FDB table entries dumped is added to *@idx
4343  *
4344  * Default netdevice operation to dump the existing unicast address list.
4345  * Returns number of addresses from list put in skb.
4346  */
ndo_dflt_fdb_dump(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev,struct net_device * filter_dev,int * idx)4347 int ndo_dflt_fdb_dump(struct sk_buff *skb,
4348 		      struct netlink_callback *cb,
4349 		      struct net_device *dev,
4350 		      struct net_device *filter_dev,
4351 		      int *idx)
4352 {
4353 	int err;
4354 
4355 	if (dev->type != ARPHRD_ETHER)
4356 		return -EINVAL;
4357 
4358 	netif_addr_lock_bh(dev);
4359 	err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
4360 	if (err)
4361 		goto out;
4362 	err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
4363 out:
4364 	netif_addr_unlock_bh(dev);
4365 	return err;
4366 }
4367 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
4368 
valid_fdb_dump_strict(const struct nlmsghdr * nlh,int * br_idx,int * brport_idx,struct netlink_ext_ack * extack)4369 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
4370 				 int *br_idx, int *brport_idx,
4371 				 struct netlink_ext_ack *extack)
4372 {
4373 	struct nlattr *tb[NDA_MAX + 1];
4374 	struct ndmsg *ndm;
4375 	int err, i;
4376 
4377 	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4378 		NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
4379 		return -EINVAL;
4380 	}
4381 
4382 	ndm = nlmsg_data(nlh);
4383 	if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4384 	    ndm->ndm_flags || ndm->ndm_type) {
4385 		NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
4386 		return -EINVAL;
4387 	}
4388 
4389 	err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4390 					    NDA_MAX, NULL, extack);
4391 	if (err < 0)
4392 		return err;
4393 
4394 	*brport_idx = ndm->ndm_ifindex;
4395 	for (i = 0; i <= NDA_MAX; ++i) {
4396 		if (!tb[i])
4397 			continue;
4398 
4399 		switch (i) {
4400 		case NDA_IFINDEX:
4401 			if (nla_len(tb[i]) != sizeof(u32)) {
4402 				NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
4403 				return -EINVAL;
4404 			}
4405 			*brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
4406 			break;
4407 		case NDA_MASTER:
4408 			if (nla_len(tb[i]) != sizeof(u32)) {
4409 				NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
4410 				return -EINVAL;
4411 			}
4412 			*br_idx = nla_get_u32(tb[NDA_MASTER]);
4413 			break;
4414 		default:
4415 			NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
4416 			return -EINVAL;
4417 		}
4418 	}
4419 
4420 	return 0;
4421 }
4422 
valid_fdb_dump_legacy(const struct nlmsghdr * nlh,int * br_idx,int * brport_idx,struct netlink_ext_ack * extack)4423 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
4424 				 int *br_idx, int *brport_idx,
4425 				 struct netlink_ext_ack *extack)
4426 {
4427 	struct nlattr *tb[IFLA_MAX+1];
4428 	int err;
4429 
4430 	/* A hack to preserve kernel<->userspace interface.
4431 	 * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
4432 	 * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
4433 	 * So, check for ndmsg with an optional u32 attribute (not used here).
4434 	 * Fortunately these sizes don't conflict with the size of ifinfomsg
4435 	 * with an optional attribute.
4436 	 */
4437 	if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
4438 	    (nlmsg_len(nlh) != sizeof(struct ndmsg) +
4439 	     nla_attr_size(sizeof(u32)))) {
4440 		struct ifinfomsg *ifm;
4441 
4442 		err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4443 					     tb, IFLA_MAX, ifla_policy,
4444 					     extack);
4445 		if (err < 0) {
4446 			return -EINVAL;
4447 		} else if (err == 0) {
4448 			if (tb[IFLA_MASTER])
4449 				*br_idx = nla_get_u32(tb[IFLA_MASTER]);
4450 		}
4451 
4452 		ifm = nlmsg_data(nlh);
4453 		*brport_idx = ifm->ifi_index;
4454 	}
4455 	return 0;
4456 }
4457 
rtnl_fdb_dump(struct sk_buff * skb,struct netlink_callback * cb)4458 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
4459 {
4460 	struct net_device *dev;
4461 	struct net_device *br_dev = NULL;
4462 	const struct net_device_ops *ops = NULL;
4463 	const struct net_device_ops *cops = NULL;
4464 	struct net *net = sock_net(skb->sk);
4465 	struct hlist_head *head;
4466 	int brport_idx = 0;
4467 	int br_idx = 0;
4468 	int h, s_h;
4469 	int idx = 0, s_idx;
4470 	int err = 0;
4471 	int fidx = 0;
4472 
4473 	if (cb->strict_check)
4474 		err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4475 					    cb->extack);
4476 	else
4477 		err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4478 					    cb->extack);
4479 	if (err < 0)
4480 		return err;
4481 
4482 	if (br_idx) {
4483 		br_dev = __dev_get_by_index(net, br_idx);
4484 		if (!br_dev)
4485 			return -ENODEV;
4486 
4487 		ops = br_dev->netdev_ops;
4488 	}
4489 
4490 	s_h = cb->args[0];
4491 	s_idx = cb->args[1];
4492 
4493 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4494 		idx = 0;
4495 		head = &net->dev_index_head[h];
4496 		hlist_for_each_entry(dev, head, index_hlist) {
4497 
4498 			if (brport_idx && (dev->ifindex != brport_idx))
4499 				continue;
4500 
4501 			if (!br_idx) { /* user did not specify a specific bridge */
4502 				if (netif_is_bridge_port(dev)) {
4503 					br_dev = netdev_master_upper_dev_get(dev);
4504 					cops = br_dev->netdev_ops;
4505 				}
4506 			} else {
4507 				if (dev != br_dev &&
4508 				    !netif_is_bridge_port(dev))
4509 					continue;
4510 
4511 				if (br_dev != netdev_master_upper_dev_get(dev) &&
4512 				    !netif_is_bridge_master(dev))
4513 					continue;
4514 				cops = ops;
4515 			}
4516 
4517 			if (idx < s_idx)
4518 				goto cont;
4519 
4520 			if (netif_is_bridge_port(dev)) {
4521 				if (cops && cops->ndo_fdb_dump) {
4522 					err = cops->ndo_fdb_dump(skb, cb,
4523 								br_dev, dev,
4524 								&fidx);
4525 					if (err == -EMSGSIZE)
4526 						goto out;
4527 				}
4528 			}
4529 
4530 			if (dev->netdev_ops->ndo_fdb_dump)
4531 				err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4532 								    dev, NULL,
4533 								    &fidx);
4534 			else
4535 				err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4536 							&fidx);
4537 			if (err == -EMSGSIZE)
4538 				goto out;
4539 
4540 			cops = NULL;
4541 
4542 			/* reset fdb offset to 0 for rest of the interfaces */
4543 			cb->args[2] = 0;
4544 			fidx = 0;
4545 cont:
4546 			idx++;
4547 		}
4548 	}
4549 
4550 out:
4551 	cb->args[0] = h;
4552 	cb->args[1] = idx;
4553 	cb->args[2] = fidx;
4554 
4555 	return skb->len;
4556 }
4557 
valid_fdb_get_strict(const struct nlmsghdr * nlh,struct nlattr ** tb,u8 * ndm_flags,int * br_idx,int * brport_idx,u8 ** addr,u16 * vid,struct netlink_ext_ack * extack)4558 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4559 				struct nlattr **tb, u8 *ndm_flags,
4560 				int *br_idx, int *brport_idx, u8 **addr,
4561 				u16 *vid, struct netlink_ext_ack *extack)
4562 {
4563 	struct ndmsg *ndm;
4564 	int err, i;
4565 
4566 	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4567 		NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4568 		return -EINVAL;
4569 	}
4570 
4571 	ndm = nlmsg_data(nlh);
4572 	if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4573 	    ndm->ndm_type) {
4574 		NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4575 		return -EINVAL;
4576 	}
4577 
4578 	if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4579 		NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4580 		return -EINVAL;
4581 	}
4582 
4583 	err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4584 					    NDA_MAX, nda_policy, extack);
4585 	if (err < 0)
4586 		return err;
4587 
4588 	*ndm_flags = ndm->ndm_flags;
4589 	*brport_idx = ndm->ndm_ifindex;
4590 	for (i = 0; i <= NDA_MAX; ++i) {
4591 		if (!tb[i])
4592 			continue;
4593 
4594 		switch (i) {
4595 		case NDA_MASTER:
4596 			*br_idx = nla_get_u32(tb[i]);
4597 			break;
4598 		case NDA_LLADDR:
4599 			if (nla_len(tb[i]) != ETH_ALEN) {
4600 				NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4601 				return -EINVAL;
4602 			}
4603 			*addr = nla_data(tb[i]);
4604 			break;
4605 		case NDA_VLAN:
4606 			err = fdb_vid_parse(tb[i], vid, extack);
4607 			if (err)
4608 				return err;
4609 			break;
4610 		case NDA_VNI:
4611 			break;
4612 		default:
4613 			NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4614 			return -EINVAL;
4615 		}
4616 	}
4617 
4618 	return 0;
4619 }
4620 
rtnl_fdb_get(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4621 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4622 			struct netlink_ext_ack *extack)
4623 {
4624 	struct net_device *dev = NULL, *br_dev = NULL;
4625 	const struct net_device_ops *ops = NULL;
4626 	struct net *net = sock_net(in_skb->sk);
4627 	struct nlattr *tb[NDA_MAX + 1];
4628 	struct sk_buff *skb;
4629 	int brport_idx = 0;
4630 	u8 ndm_flags = 0;
4631 	int br_idx = 0;
4632 	u8 *addr = NULL;
4633 	u16 vid = 0;
4634 	int err;
4635 
4636 	err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4637 				   &brport_idx, &addr, &vid, extack);
4638 	if (err < 0)
4639 		return err;
4640 
4641 	if (!addr) {
4642 		NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4643 		return -EINVAL;
4644 	}
4645 
4646 	if (brport_idx) {
4647 		dev = __dev_get_by_index(net, brport_idx);
4648 		if (!dev) {
4649 			NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4650 			return -ENODEV;
4651 		}
4652 	}
4653 
4654 	if (br_idx) {
4655 		if (dev) {
4656 			NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4657 			return -EINVAL;
4658 		}
4659 
4660 		br_dev = __dev_get_by_index(net, br_idx);
4661 		if (!br_dev) {
4662 			NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4663 			return -EINVAL;
4664 		}
4665 		ops = br_dev->netdev_ops;
4666 	}
4667 
4668 	if (dev) {
4669 		if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4670 			if (!netif_is_bridge_port(dev)) {
4671 				NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4672 				return -EINVAL;
4673 			}
4674 			br_dev = netdev_master_upper_dev_get(dev);
4675 			if (!br_dev) {
4676 				NL_SET_ERR_MSG(extack, "Master of device not found");
4677 				return -EINVAL;
4678 			}
4679 			ops = br_dev->netdev_ops;
4680 		} else {
4681 			if (!(ndm_flags & NTF_SELF)) {
4682 				NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4683 				return -EINVAL;
4684 			}
4685 			ops = dev->netdev_ops;
4686 		}
4687 	}
4688 
4689 	if (!br_dev && !dev) {
4690 		NL_SET_ERR_MSG(extack, "No device specified");
4691 		return -ENODEV;
4692 	}
4693 
4694 	if (!ops || !ops->ndo_fdb_get) {
4695 		NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4696 		return -EOPNOTSUPP;
4697 	}
4698 
4699 	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4700 	if (!skb)
4701 		return -ENOBUFS;
4702 
4703 	if (br_dev)
4704 		dev = br_dev;
4705 	err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4706 			       NETLINK_CB(in_skb).portid,
4707 			       nlh->nlmsg_seq, extack);
4708 	if (err)
4709 		goto out;
4710 
4711 	return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4712 out:
4713 	kfree_skb(skb);
4714 	return err;
4715 }
4716 
brport_nla_put_flag(struct sk_buff * skb,u32 flags,u32 mask,unsigned int attrnum,unsigned int flag)4717 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4718 			       unsigned int attrnum, unsigned int flag)
4719 {
4720 	if (mask & flag)
4721 		return nla_put_u8(skb, attrnum, !!(flags & flag));
4722 	return 0;
4723 }
4724 
ndo_dflt_bridge_getlink(struct sk_buff * skb,u32 pid,u32 seq,struct net_device * dev,u16 mode,u32 flags,u32 mask,int nlflags,u32 filter_mask,int (* vlan_fill)(struct sk_buff * skb,struct net_device * dev,u32 filter_mask))4725 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4726 			    struct net_device *dev, u16 mode,
4727 			    u32 flags, u32 mask, int nlflags,
4728 			    u32 filter_mask,
4729 			    int (*vlan_fill)(struct sk_buff *skb,
4730 					     struct net_device *dev,
4731 					     u32 filter_mask))
4732 {
4733 	struct nlmsghdr *nlh;
4734 	struct ifinfomsg *ifm;
4735 	struct nlattr *br_afspec;
4736 	struct nlattr *protinfo;
4737 	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4738 	struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4739 	int err = 0;
4740 
4741 	nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4742 	if (nlh == NULL)
4743 		return -EMSGSIZE;
4744 
4745 	ifm = nlmsg_data(nlh);
4746 	ifm->ifi_family = AF_BRIDGE;
4747 	ifm->__ifi_pad = 0;
4748 	ifm->ifi_type = dev->type;
4749 	ifm->ifi_index = dev->ifindex;
4750 	ifm->ifi_flags = dev_get_flags(dev);
4751 	ifm->ifi_change = 0;
4752 
4753 
4754 	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4755 	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4756 	    nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4757 	    (br_dev &&
4758 	     nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4759 	    (dev->addr_len &&
4760 	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4761 	    (dev->ifindex != dev_get_iflink(dev) &&
4762 	     nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4763 		goto nla_put_failure;
4764 
4765 	br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4766 	if (!br_afspec)
4767 		goto nla_put_failure;
4768 
4769 	if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4770 		nla_nest_cancel(skb, br_afspec);
4771 		goto nla_put_failure;
4772 	}
4773 
4774 	if (mode != BRIDGE_MODE_UNDEF) {
4775 		if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4776 			nla_nest_cancel(skb, br_afspec);
4777 			goto nla_put_failure;
4778 		}
4779 	}
4780 	if (vlan_fill) {
4781 		err = vlan_fill(skb, dev, filter_mask);
4782 		if (err) {
4783 			nla_nest_cancel(skb, br_afspec);
4784 			goto nla_put_failure;
4785 		}
4786 	}
4787 	nla_nest_end(skb, br_afspec);
4788 
4789 	protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4790 	if (!protinfo)
4791 		goto nla_put_failure;
4792 
4793 	if (brport_nla_put_flag(skb, flags, mask,
4794 				IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4795 	    brport_nla_put_flag(skb, flags, mask,
4796 				IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4797 	    brport_nla_put_flag(skb, flags, mask,
4798 				IFLA_BRPORT_FAST_LEAVE,
4799 				BR_MULTICAST_FAST_LEAVE) ||
4800 	    brport_nla_put_flag(skb, flags, mask,
4801 				IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4802 	    brport_nla_put_flag(skb, flags, mask,
4803 				IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4804 	    brport_nla_put_flag(skb, flags, mask,
4805 				IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4806 	    brport_nla_put_flag(skb, flags, mask,
4807 				IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4808 	    brport_nla_put_flag(skb, flags, mask,
4809 				IFLA_BRPORT_PROXYARP, BR_PROXYARP) ||
4810 	    brport_nla_put_flag(skb, flags, mask,
4811 				IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) ||
4812 	    brport_nla_put_flag(skb, flags, mask,
4813 				IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) {
4814 		nla_nest_cancel(skb, protinfo);
4815 		goto nla_put_failure;
4816 	}
4817 
4818 	nla_nest_end(skb, protinfo);
4819 
4820 	nlmsg_end(skb, nlh);
4821 	return 0;
4822 nla_put_failure:
4823 	nlmsg_cancel(skb, nlh);
4824 	return err ? err : -EMSGSIZE;
4825 }
4826 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4827 
valid_bridge_getlink_req(const struct nlmsghdr * nlh,bool strict_check,u32 * filter_mask,struct netlink_ext_ack * extack)4828 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4829 				    bool strict_check, u32 *filter_mask,
4830 				    struct netlink_ext_ack *extack)
4831 {
4832 	struct nlattr *tb[IFLA_MAX+1];
4833 	int err, i;
4834 
4835 	if (strict_check) {
4836 		struct ifinfomsg *ifm;
4837 
4838 		if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4839 			NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4840 			return -EINVAL;
4841 		}
4842 
4843 		ifm = nlmsg_data(nlh);
4844 		if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4845 		    ifm->ifi_change || ifm->ifi_index) {
4846 			NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4847 			return -EINVAL;
4848 		}
4849 
4850 		err = nlmsg_parse_deprecated_strict(nlh,
4851 						    sizeof(struct ifinfomsg),
4852 						    tb, IFLA_MAX, ifla_policy,
4853 						    extack);
4854 	} else {
4855 		err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4856 					     tb, IFLA_MAX, ifla_policy,
4857 					     extack);
4858 	}
4859 	if (err < 0)
4860 		return err;
4861 
4862 	/* new attributes should only be added with strict checking */
4863 	for (i = 0; i <= IFLA_MAX; ++i) {
4864 		if (!tb[i])
4865 			continue;
4866 
4867 		switch (i) {
4868 		case IFLA_EXT_MASK:
4869 			*filter_mask = nla_get_u32(tb[i]);
4870 			break;
4871 		default:
4872 			if (strict_check) {
4873 				NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4874 				return -EINVAL;
4875 			}
4876 		}
4877 	}
4878 
4879 	return 0;
4880 }
4881 
rtnl_bridge_getlink(struct sk_buff * skb,struct netlink_callback * cb)4882 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4883 {
4884 	const struct nlmsghdr *nlh = cb->nlh;
4885 	struct net *net = sock_net(skb->sk);
4886 	struct net_device *dev;
4887 	int idx = 0;
4888 	u32 portid = NETLINK_CB(cb->skb).portid;
4889 	u32 seq = nlh->nlmsg_seq;
4890 	u32 filter_mask = 0;
4891 	int err;
4892 
4893 	err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4894 				       cb->extack);
4895 	if (err < 0 && cb->strict_check)
4896 		return err;
4897 
4898 	rcu_read_lock();
4899 	for_each_netdev_rcu(net, dev) {
4900 		const struct net_device_ops *ops = dev->netdev_ops;
4901 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4902 
4903 		if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4904 			if (idx >= cb->args[0]) {
4905 				err = br_dev->netdev_ops->ndo_bridge_getlink(
4906 						skb, portid, seq, dev,
4907 						filter_mask, NLM_F_MULTI);
4908 				if (err < 0 && err != -EOPNOTSUPP) {
4909 					if (likely(skb->len))
4910 						break;
4911 
4912 					goto out_err;
4913 				}
4914 			}
4915 			idx++;
4916 		}
4917 
4918 		if (ops->ndo_bridge_getlink) {
4919 			if (idx >= cb->args[0]) {
4920 				err = ops->ndo_bridge_getlink(skb, portid,
4921 							      seq, dev,
4922 							      filter_mask,
4923 							      NLM_F_MULTI);
4924 				if (err < 0 && err != -EOPNOTSUPP) {
4925 					if (likely(skb->len))
4926 						break;
4927 
4928 					goto out_err;
4929 				}
4930 			}
4931 			idx++;
4932 		}
4933 	}
4934 	err = skb->len;
4935 out_err:
4936 	rcu_read_unlock();
4937 	cb->args[0] = idx;
4938 
4939 	return err;
4940 }
4941 
bridge_nlmsg_size(void)4942 static inline size_t bridge_nlmsg_size(void)
4943 {
4944 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4945 		+ nla_total_size(IFNAMSIZ)	/* IFLA_IFNAME */
4946 		+ nla_total_size(MAX_ADDR_LEN)	/* IFLA_ADDRESS */
4947 		+ nla_total_size(sizeof(u32))	/* IFLA_MASTER */
4948 		+ nla_total_size(sizeof(u32))	/* IFLA_MTU */
4949 		+ nla_total_size(sizeof(u32))	/* IFLA_LINK */
4950 		+ nla_total_size(sizeof(u32))	/* IFLA_OPERSTATE */
4951 		+ nla_total_size(sizeof(u8))	/* IFLA_PROTINFO */
4952 		+ nla_total_size(sizeof(struct nlattr))	/* IFLA_AF_SPEC */
4953 		+ nla_total_size(sizeof(u16))	/* IFLA_BRIDGE_FLAGS */
4954 		+ nla_total_size(sizeof(u16));	/* IFLA_BRIDGE_MODE */
4955 }
4956 
rtnl_bridge_notify(struct net_device * dev)4957 static int rtnl_bridge_notify(struct net_device *dev)
4958 {
4959 	struct net *net = dev_net(dev);
4960 	struct sk_buff *skb;
4961 	int err = -EOPNOTSUPP;
4962 
4963 	if (!dev->netdev_ops->ndo_bridge_getlink)
4964 		return 0;
4965 
4966 	skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4967 	if (!skb) {
4968 		err = -ENOMEM;
4969 		goto errout;
4970 	}
4971 
4972 	err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4973 	if (err < 0)
4974 		goto errout;
4975 
4976 	/* Notification info is only filled for bridge ports, not the bridge
4977 	 * device itself. Therefore, a zero notification length is valid and
4978 	 * should not result in an error.
4979 	 */
4980 	if (!skb->len)
4981 		goto errout;
4982 
4983 	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4984 	return 0;
4985 errout:
4986 	WARN_ON(err == -EMSGSIZE);
4987 	kfree_skb(skb);
4988 	if (err)
4989 		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4990 	return err;
4991 }
4992 
rtnl_bridge_setlink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4993 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4994 			       struct netlink_ext_ack *extack)
4995 {
4996 	struct net *net = sock_net(skb->sk);
4997 	struct ifinfomsg *ifm;
4998 	struct net_device *dev;
4999 	struct nlattr *br_spec, *attr = NULL;
5000 	int rem, err = -EOPNOTSUPP;
5001 	u16 flags = 0;
5002 	bool have_flags = false;
5003 
5004 	if (nlmsg_len(nlh) < sizeof(*ifm))
5005 		return -EINVAL;
5006 
5007 	ifm = nlmsg_data(nlh);
5008 	if (ifm->ifi_family != AF_BRIDGE)
5009 		return -EPFNOSUPPORT;
5010 
5011 	dev = __dev_get_by_index(net, ifm->ifi_index);
5012 	if (!dev) {
5013 		NL_SET_ERR_MSG(extack, "unknown ifindex");
5014 		return -ENODEV;
5015 	}
5016 
5017 	br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
5018 	if (br_spec) {
5019 		nla_for_each_nested(attr, br_spec, rem) {
5020 			if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
5021 				if (nla_len(attr) < sizeof(flags))
5022 					return -EINVAL;
5023 
5024 				have_flags = true;
5025 				flags = nla_get_u16(attr);
5026 				break;
5027 			}
5028 		}
5029 	}
5030 
5031 	if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
5032 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
5033 
5034 		if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
5035 			err = -EOPNOTSUPP;
5036 			goto out;
5037 		}
5038 
5039 		err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
5040 							     extack);
5041 		if (err)
5042 			goto out;
5043 
5044 		flags &= ~BRIDGE_FLAGS_MASTER;
5045 	}
5046 
5047 	if ((flags & BRIDGE_FLAGS_SELF)) {
5048 		if (!dev->netdev_ops->ndo_bridge_setlink)
5049 			err = -EOPNOTSUPP;
5050 		else
5051 			err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
5052 								  flags,
5053 								  extack);
5054 		if (!err) {
5055 			flags &= ~BRIDGE_FLAGS_SELF;
5056 
5057 			/* Generate event to notify upper layer of bridge
5058 			 * change
5059 			 */
5060 			err = rtnl_bridge_notify(dev);
5061 		}
5062 	}
5063 
5064 	if (have_flags)
5065 		memcpy(nla_data(attr), &flags, sizeof(flags));
5066 out:
5067 	return err;
5068 }
5069 
rtnl_bridge_dellink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5070 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
5071 			       struct netlink_ext_ack *extack)
5072 {
5073 	struct net *net = sock_net(skb->sk);
5074 	struct ifinfomsg *ifm;
5075 	struct net_device *dev;
5076 	struct nlattr *br_spec, *attr = NULL;
5077 	int rem, err = -EOPNOTSUPP;
5078 	u16 flags = 0;
5079 	bool have_flags = false;
5080 
5081 	if (nlmsg_len(nlh) < sizeof(*ifm))
5082 		return -EINVAL;
5083 
5084 	ifm = nlmsg_data(nlh);
5085 	if (ifm->ifi_family != AF_BRIDGE)
5086 		return -EPFNOSUPPORT;
5087 
5088 	dev = __dev_get_by_index(net, ifm->ifi_index);
5089 	if (!dev) {
5090 		NL_SET_ERR_MSG(extack, "unknown ifindex");
5091 		return -ENODEV;
5092 	}
5093 
5094 	br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
5095 	if (br_spec) {
5096 		nla_for_each_nested(attr, br_spec, rem) {
5097 			if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
5098 				if (nla_len(attr) < sizeof(flags))
5099 					return -EINVAL;
5100 
5101 				have_flags = true;
5102 				flags = nla_get_u16(attr);
5103 				break;
5104 			}
5105 		}
5106 	}
5107 
5108 	if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
5109 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
5110 
5111 		if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
5112 			err = -EOPNOTSUPP;
5113 			goto out;
5114 		}
5115 
5116 		err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
5117 		if (err)
5118 			goto out;
5119 
5120 		flags &= ~BRIDGE_FLAGS_MASTER;
5121 	}
5122 
5123 	if ((flags & BRIDGE_FLAGS_SELF)) {
5124 		if (!dev->netdev_ops->ndo_bridge_dellink)
5125 			err = -EOPNOTSUPP;
5126 		else
5127 			err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
5128 								  flags);
5129 
5130 		if (!err) {
5131 			flags &= ~BRIDGE_FLAGS_SELF;
5132 
5133 			/* Generate event to notify upper layer of bridge
5134 			 * change
5135 			 */
5136 			err = rtnl_bridge_notify(dev);
5137 		}
5138 	}
5139 
5140 	if (have_flags)
5141 		memcpy(nla_data(attr), &flags, sizeof(flags));
5142 out:
5143 	return err;
5144 }
5145 
stats_attr_valid(unsigned int mask,int attrid,int idxattr)5146 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
5147 {
5148 	return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
5149 	       (!idxattr || idxattr == attrid);
5150 }
5151 
5152 static bool
rtnl_offload_xstats_have_ndo(const struct net_device * dev,int attr_id)5153 rtnl_offload_xstats_have_ndo(const struct net_device *dev, int attr_id)
5154 {
5155 	return dev->netdev_ops &&
5156 	       dev->netdev_ops->ndo_has_offload_stats &&
5157 	       dev->netdev_ops->ndo_get_offload_stats &&
5158 	       dev->netdev_ops->ndo_has_offload_stats(dev, attr_id);
5159 }
5160 
5161 static unsigned int
rtnl_offload_xstats_get_size_ndo(const struct net_device * dev,int attr_id)5162 rtnl_offload_xstats_get_size_ndo(const struct net_device *dev, int attr_id)
5163 {
5164 	return rtnl_offload_xstats_have_ndo(dev, attr_id) ?
5165 	       sizeof(struct rtnl_link_stats64) : 0;
5166 }
5167 
5168 static int
rtnl_offload_xstats_fill_ndo(struct net_device * dev,int attr_id,struct sk_buff * skb)5169 rtnl_offload_xstats_fill_ndo(struct net_device *dev, int attr_id,
5170 			     struct sk_buff *skb)
5171 {
5172 	unsigned int size = rtnl_offload_xstats_get_size_ndo(dev, attr_id);
5173 	struct nlattr *attr = NULL;
5174 	void *attr_data;
5175 	int err;
5176 
5177 	if (!size)
5178 		return -ENODATA;
5179 
5180 	attr = nla_reserve_64bit(skb, attr_id, size,
5181 				 IFLA_OFFLOAD_XSTATS_UNSPEC);
5182 	if (!attr)
5183 		return -EMSGSIZE;
5184 
5185 	attr_data = nla_data(attr);
5186 	memset(attr_data, 0, size);
5187 
5188 	err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, attr_data);
5189 	if (err)
5190 		return err;
5191 
5192 	return 0;
5193 }
5194 
5195 static unsigned int
rtnl_offload_xstats_get_size_stats(const struct net_device * dev,enum netdev_offload_xstats_type type)5196 rtnl_offload_xstats_get_size_stats(const struct net_device *dev,
5197 				   enum netdev_offload_xstats_type type)
5198 {
5199 	bool enabled = netdev_offload_xstats_enabled(dev, type);
5200 
5201 	return enabled ? sizeof(struct rtnl_hw_stats64) : 0;
5202 }
5203 
5204 struct rtnl_offload_xstats_request_used {
5205 	bool request;
5206 	bool used;
5207 };
5208 
5209 static int
rtnl_offload_xstats_get_stats(struct net_device * dev,enum netdev_offload_xstats_type type,struct rtnl_offload_xstats_request_used * ru,struct rtnl_hw_stats64 * stats,struct netlink_ext_ack * extack)5210 rtnl_offload_xstats_get_stats(struct net_device *dev,
5211 			      enum netdev_offload_xstats_type type,
5212 			      struct rtnl_offload_xstats_request_used *ru,
5213 			      struct rtnl_hw_stats64 *stats,
5214 			      struct netlink_ext_ack *extack)
5215 {
5216 	bool request;
5217 	bool used;
5218 	int err;
5219 
5220 	request = netdev_offload_xstats_enabled(dev, type);
5221 	if (!request) {
5222 		used = false;
5223 		goto out;
5224 	}
5225 
5226 	err = netdev_offload_xstats_get(dev, type, stats, &used, extack);
5227 	if (err)
5228 		return err;
5229 
5230 out:
5231 	if (ru) {
5232 		ru->request = request;
5233 		ru->used = used;
5234 	}
5235 	return 0;
5236 }
5237 
5238 static int
rtnl_offload_xstats_fill_hw_s_info_one(struct sk_buff * skb,int attr_id,struct rtnl_offload_xstats_request_used * ru)5239 rtnl_offload_xstats_fill_hw_s_info_one(struct sk_buff *skb, int attr_id,
5240 				       struct rtnl_offload_xstats_request_used *ru)
5241 {
5242 	struct nlattr *nest;
5243 
5244 	nest = nla_nest_start(skb, attr_id);
5245 	if (!nest)
5246 		return -EMSGSIZE;
5247 
5248 	if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST, ru->request))
5249 		goto nla_put_failure;
5250 
5251 	if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED, ru->used))
5252 		goto nla_put_failure;
5253 
5254 	nla_nest_end(skb, nest);
5255 	return 0;
5256 
5257 nla_put_failure:
5258 	nla_nest_cancel(skb, nest);
5259 	return -EMSGSIZE;
5260 }
5261 
5262 static int
rtnl_offload_xstats_fill_hw_s_info(struct sk_buff * skb,struct net_device * dev,struct netlink_ext_ack * extack)5263 rtnl_offload_xstats_fill_hw_s_info(struct sk_buff *skb, struct net_device *dev,
5264 				   struct netlink_ext_ack *extack)
5265 {
5266 	enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5267 	struct rtnl_offload_xstats_request_used ru_l3;
5268 	struct nlattr *nest;
5269 	int err;
5270 
5271 	err = rtnl_offload_xstats_get_stats(dev, t_l3, &ru_l3, NULL, extack);
5272 	if (err)
5273 		return err;
5274 
5275 	nest = nla_nest_start(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO);
5276 	if (!nest)
5277 		return -EMSGSIZE;
5278 
5279 	if (rtnl_offload_xstats_fill_hw_s_info_one(skb,
5280 						   IFLA_OFFLOAD_XSTATS_L3_STATS,
5281 						   &ru_l3))
5282 		goto nla_put_failure;
5283 
5284 	nla_nest_end(skb, nest);
5285 	return 0;
5286 
5287 nla_put_failure:
5288 	nla_nest_cancel(skb, nest);
5289 	return -EMSGSIZE;
5290 }
5291 
rtnl_offload_xstats_fill(struct sk_buff * skb,struct net_device * dev,int * prividx,u32 off_filter_mask,struct netlink_ext_ack * extack)5292 static int rtnl_offload_xstats_fill(struct sk_buff *skb, struct net_device *dev,
5293 				    int *prividx, u32 off_filter_mask,
5294 				    struct netlink_ext_ack *extack)
5295 {
5296 	enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5297 	int attr_id_hw_s_info = IFLA_OFFLOAD_XSTATS_HW_S_INFO;
5298 	int attr_id_l3_stats = IFLA_OFFLOAD_XSTATS_L3_STATS;
5299 	int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT;
5300 	bool have_data = false;
5301 	int err;
5302 
5303 	if (*prividx <= attr_id_cpu_hit &&
5304 	    (off_filter_mask &
5305 	     IFLA_STATS_FILTER_BIT(attr_id_cpu_hit))) {
5306 		err = rtnl_offload_xstats_fill_ndo(dev, attr_id_cpu_hit, skb);
5307 		if (!err) {
5308 			have_data = true;
5309 		} else if (err != -ENODATA) {
5310 			*prividx = attr_id_cpu_hit;
5311 			return err;
5312 		}
5313 	}
5314 
5315 	if (*prividx <= attr_id_hw_s_info &&
5316 	    (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_hw_s_info))) {
5317 		*prividx = attr_id_hw_s_info;
5318 
5319 		err = rtnl_offload_xstats_fill_hw_s_info(skb, dev, extack);
5320 		if (err)
5321 			return err;
5322 
5323 		have_data = true;
5324 		*prividx = 0;
5325 	}
5326 
5327 	if (*prividx <= attr_id_l3_stats &&
5328 	    (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_l3_stats))) {
5329 		unsigned int size_l3;
5330 		struct nlattr *attr;
5331 
5332 		*prividx = attr_id_l3_stats;
5333 
5334 		size_l3 = rtnl_offload_xstats_get_size_stats(dev, t_l3);
5335 		if (!size_l3)
5336 			goto skip_l3_stats;
5337 		attr = nla_reserve_64bit(skb, attr_id_l3_stats, size_l3,
5338 					 IFLA_OFFLOAD_XSTATS_UNSPEC);
5339 		if (!attr)
5340 			return -EMSGSIZE;
5341 
5342 		err = rtnl_offload_xstats_get_stats(dev, t_l3, NULL,
5343 						    nla_data(attr), extack);
5344 		if (err)
5345 			return err;
5346 
5347 		have_data = true;
5348 skip_l3_stats:
5349 		*prividx = 0;
5350 	}
5351 
5352 	if (!have_data)
5353 		return -ENODATA;
5354 
5355 	*prividx = 0;
5356 	return 0;
5357 }
5358 
5359 static unsigned int
rtnl_offload_xstats_get_size_hw_s_info_one(const struct net_device * dev,enum netdev_offload_xstats_type type)5360 rtnl_offload_xstats_get_size_hw_s_info_one(const struct net_device *dev,
5361 					   enum netdev_offload_xstats_type type)
5362 {
5363 	bool enabled = netdev_offload_xstats_enabled(dev, type);
5364 
5365 	return nla_total_size(0) +
5366 		/* IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST */
5367 		nla_total_size(sizeof(u8)) +
5368 		/* IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED */
5369 		(enabled ? nla_total_size(sizeof(u8)) : 0) +
5370 		0;
5371 }
5372 
5373 static unsigned int
rtnl_offload_xstats_get_size_hw_s_info(const struct net_device * dev)5374 rtnl_offload_xstats_get_size_hw_s_info(const struct net_device *dev)
5375 {
5376 	enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5377 
5378 	return nla_total_size(0) +
5379 		/* IFLA_OFFLOAD_XSTATS_L3_STATS */
5380 		rtnl_offload_xstats_get_size_hw_s_info_one(dev, t_l3) +
5381 		0;
5382 }
5383 
rtnl_offload_xstats_get_size(const struct net_device * dev,u32 off_filter_mask)5384 static int rtnl_offload_xstats_get_size(const struct net_device *dev,
5385 					u32 off_filter_mask)
5386 {
5387 	enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5388 	int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT;
5389 	int nla_size = 0;
5390 	int size;
5391 
5392 	if (off_filter_mask &
5393 	    IFLA_STATS_FILTER_BIT(attr_id_cpu_hit)) {
5394 		size = rtnl_offload_xstats_get_size_ndo(dev, attr_id_cpu_hit);
5395 		nla_size += nla_total_size_64bit(size);
5396 	}
5397 
5398 	if (off_filter_mask &
5399 	    IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO))
5400 		nla_size += rtnl_offload_xstats_get_size_hw_s_info(dev);
5401 
5402 	if (off_filter_mask &
5403 	    IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_L3_STATS)) {
5404 		size = rtnl_offload_xstats_get_size_stats(dev, t_l3);
5405 		nla_size += nla_total_size_64bit(size);
5406 	}
5407 
5408 	if (nla_size != 0)
5409 		nla_size += nla_total_size(0);
5410 
5411 	return nla_size;
5412 }
5413 
5414 struct rtnl_stats_dump_filters {
5415 	/* mask[0] filters outer attributes. Then individual nests have their
5416 	 * filtering mask at the index of the nested attribute.
5417 	 */
5418 	u32 mask[IFLA_STATS_MAX + 1];
5419 };
5420 
rtnl_fill_statsinfo(struct sk_buff * skb,struct net_device * dev,int type,u32 pid,u32 seq,u32 change,unsigned int flags,const struct rtnl_stats_dump_filters * filters,int * idxattr,int * prividx,struct netlink_ext_ack * extack)5421 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
5422 			       int type, u32 pid, u32 seq, u32 change,
5423 			       unsigned int flags,
5424 			       const struct rtnl_stats_dump_filters *filters,
5425 			       int *idxattr, int *prividx,
5426 			       struct netlink_ext_ack *extack)
5427 {
5428 	unsigned int filter_mask = filters->mask[0];
5429 	struct if_stats_msg *ifsm;
5430 	struct nlmsghdr *nlh;
5431 	struct nlattr *attr;
5432 	int s_prividx = *prividx;
5433 	int err;
5434 
5435 	ASSERT_RTNL();
5436 
5437 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
5438 	if (!nlh)
5439 		return -EMSGSIZE;
5440 
5441 	ifsm = nlmsg_data(nlh);
5442 	ifsm->family = PF_UNSPEC;
5443 	ifsm->pad1 = 0;
5444 	ifsm->pad2 = 0;
5445 	ifsm->ifindex = dev->ifindex;
5446 	ifsm->filter_mask = filter_mask;
5447 
5448 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
5449 		struct rtnl_link_stats64 *sp;
5450 
5451 		attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
5452 					 sizeof(struct rtnl_link_stats64),
5453 					 IFLA_STATS_UNSPEC);
5454 		if (!attr) {
5455 			err = -EMSGSIZE;
5456 			goto nla_put_failure;
5457 		}
5458 
5459 		sp = nla_data(attr);
5460 		dev_get_stats(dev, sp);
5461 	}
5462 
5463 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
5464 		const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5465 
5466 		if (ops && ops->fill_linkxstats) {
5467 			*idxattr = IFLA_STATS_LINK_XSTATS;
5468 			attr = nla_nest_start_noflag(skb,
5469 						     IFLA_STATS_LINK_XSTATS);
5470 			if (!attr) {
5471 				err = -EMSGSIZE;
5472 				goto nla_put_failure;
5473 			}
5474 
5475 			err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5476 			nla_nest_end(skb, attr);
5477 			if (err)
5478 				goto nla_put_failure;
5479 			*idxattr = 0;
5480 		}
5481 	}
5482 
5483 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
5484 			     *idxattr)) {
5485 		const struct rtnl_link_ops *ops = NULL;
5486 		const struct net_device *master;
5487 
5488 		master = netdev_master_upper_dev_get(dev);
5489 		if (master)
5490 			ops = master->rtnl_link_ops;
5491 		if (ops && ops->fill_linkxstats) {
5492 			*idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
5493 			attr = nla_nest_start_noflag(skb,
5494 						     IFLA_STATS_LINK_XSTATS_SLAVE);
5495 			if (!attr) {
5496 				err = -EMSGSIZE;
5497 				goto nla_put_failure;
5498 			}
5499 
5500 			err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5501 			nla_nest_end(skb, attr);
5502 			if (err)
5503 				goto nla_put_failure;
5504 			*idxattr = 0;
5505 		}
5506 	}
5507 
5508 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
5509 			     *idxattr)) {
5510 		u32 off_filter_mask;
5511 
5512 		off_filter_mask = filters->mask[IFLA_STATS_LINK_OFFLOAD_XSTATS];
5513 		*idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
5514 		attr = nla_nest_start_noflag(skb,
5515 					     IFLA_STATS_LINK_OFFLOAD_XSTATS);
5516 		if (!attr) {
5517 			err = -EMSGSIZE;
5518 			goto nla_put_failure;
5519 		}
5520 
5521 		err = rtnl_offload_xstats_fill(skb, dev, prividx,
5522 					       off_filter_mask, extack);
5523 		if (err == -ENODATA)
5524 			nla_nest_cancel(skb, attr);
5525 		else
5526 			nla_nest_end(skb, attr);
5527 
5528 		if (err && err != -ENODATA)
5529 			goto nla_put_failure;
5530 		*idxattr = 0;
5531 	}
5532 
5533 	if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
5534 		struct rtnl_af_ops *af_ops;
5535 
5536 		*idxattr = IFLA_STATS_AF_SPEC;
5537 		attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
5538 		if (!attr) {
5539 			err = -EMSGSIZE;
5540 			goto nla_put_failure;
5541 		}
5542 
5543 		rcu_read_lock();
5544 		list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5545 			if (af_ops->fill_stats_af) {
5546 				struct nlattr *af;
5547 
5548 				af = nla_nest_start_noflag(skb,
5549 							   af_ops->family);
5550 				if (!af) {
5551 					rcu_read_unlock();
5552 					err = -EMSGSIZE;
5553 					goto nla_put_failure;
5554 				}
5555 				err = af_ops->fill_stats_af(skb, dev);
5556 
5557 				if (err == -ENODATA) {
5558 					nla_nest_cancel(skb, af);
5559 				} else if (err < 0) {
5560 					rcu_read_unlock();
5561 					goto nla_put_failure;
5562 				}
5563 
5564 				nla_nest_end(skb, af);
5565 			}
5566 		}
5567 		rcu_read_unlock();
5568 
5569 		nla_nest_end(skb, attr);
5570 
5571 		*idxattr = 0;
5572 	}
5573 
5574 	nlmsg_end(skb, nlh);
5575 
5576 	return 0;
5577 
5578 nla_put_failure:
5579 	/* not a multi message or no progress mean a real error */
5580 	if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
5581 		nlmsg_cancel(skb, nlh);
5582 	else
5583 		nlmsg_end(skb, nlh);
5584 
5585 	return err;
5586 }
5587 
if_nlmsg_stats_size(const struct net_device * dev,const struct rtnl_stats_dump_filters * filters)5588 static size_t if_nlmsg_stats_size(const struct net_device *dev,
5589 				  const struct rtnl_stats_dump_filters *filters)
5590 {
5591 	size_t size = NLMSG_ALIGN(sizeof(struct if_stats_msg));
5592 	unsigned int filter_mask = filters->mask[0];
5593 
5594 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
5595 		size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
5596 
5597 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
5598 		const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5599 		int attr = IFLA_STATS_LINK_XSTATS;
5600 
5601 		if (ops && ops->get_linkxstats_size) {
5602 			size += nla_total_size(ops->get_linkxstats_size(dev,
5603 									attr));
5604 			/* for IFLA_STATS_LINK_XSTATS */
5605 			size += nla_total_size(0);
5606 		}
5607 	}
5608 
5609 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
5610 		struct net_device *_dev = (struct net_device *)dev;
5611 		const struct rtnl_link_ops *ops = NULL;
5612 		const struct net_device *master;
5613 
5614 		/* netdev_master_upper_dev_get can't take const */
5615 		master = netdev_master_upper_dev_get(_dev);
5616 		if (master)
5617 			ops = master->rtnl_link_ops;
5618 		if (ops && ops->get_linkxstats_size) {
5619 			int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
5620 
5621 			size += nla_total_size(ops->get_linkxstats_size(dev,
5622 									attr));
5623 			/* for IFLA_STATS_LINK_XSTATS_SLAVE */
5624 			size += nla_total_size(0);
5625 		}
5626 	}
5627 
5628 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) {
5629 		u32 off_filter_mask;
5630 
5631 		off_filter_mask = filters->mask[IFLA_STATS_LINK_OFFLOAD_XSTATS];
5632 		size += rtnl_offload_xstats_get_size(dev, off_filter_mask);
5633 	}
5634 
5635 	if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
5636 		struct rtnl_af_ops *af_ops;
5637 
5638 		/* for IFLA_STATS_AF_SPEC */
5639 		size += nla_total_size(0);
5640 
5641 		rcu_read_lock();
5642 		list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5643 			if (af_ops->get_stats_af_size) {
5644 				size += nla_total_size(
5645 					af_ops->get_stats_af_size(dev));
5646 
5647 				/* for AF_* */
5648 				size += nla_total_size(0);
5649 			}
5650 		}
5651 		rcu_read_unlock();
5652 	}
5653 
5654 	return size;
5655 }
5656 
5657 #define RTNL_STATS_OFFLOAD_XSTATS_VALID ((1 << __IFLA_OFFLOAD_XSTATS_MAX) - 1)
5658 
5659 static const struct nla_policy
5660 rtnl_stats_get_policy_filters[IFLA_STATS_MAX + 1] = {
5661 	[IFLA_STATS_LINK_OFFLOAD_XSTATS] =
5662 		    NLA_POLICY_MASK(NLA_U32, RTNL_STATS_OFFLOAD_XSTATS_VALID),
5663 };
5664 
5665 static const struct nla_policy
5666 rtnl_stats_get_policy[IFLA_STATS_GETSET_MAX + 1] = {
5667 	[IFLA_STATS_GET_FILTERS] =
5668 		    NLA_POLICY_NESTED(rtnl_stats_get_policy_filters),
5669 };
5670 
5671 static const struct nla_policy
5672 ifla_stats_set_policy[IFLA_STATS_GETSET_MAX + 1] = {
5673 	[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS] = NLA_POLICY_MAX(NLA_U8, 1),
5674 };
5675 
rtnl_stats_get_parse_filters(struct nlattr * ifla_filters,struct rtnl_stats_dump_filters * filters,struct netlink_ext_ack * extack)5676 static int rtnl_stats_get_parse_filters(struct nlattr *ifla_filters,
5677 					struct rtnl_stats_dump_filters *filters,
5678 					struct netlink_ext_ack *extack)
5679 {
5680 	struct nlattr *tb[IFLA_STATS_MAX + 1];
5681 	int err;
5682 	int at;
5683 
5684 	err = nla_parse_nested(tb, IFLA_STATS_MAX, ifla_filters,
5685 			       rtnl_stats_get_policy_filters, extack);
5686 	if (err < 0)
5687 		return err;
5688 
5689 	for (at = 1; at <= IFLA_STATS_MAX; at++) {
5690 		if (tb[at]) {
5691 			if (!(filters->mask[0] & IFLA_STATS_FILTER_BIT(at))) {
5692 				NL_SET_ERR_MSG(extack, "Filtered attribute not enabled in filter_mask");
5693 				return -EINVAL;
5694 			}
5695 			filters->mask[at] = nla_get_u32(tb[at]);
5696 		}
5697 	}
5698 
5699 	return 0;
5700 }
5701 
rtnl_stats_get_parse(const struct nlmsghdr * nlh,u32 filter_mask,struct rtnl_stats_dump_filters * filters,struct netlink_ext_ack * extack)5702 static int rtnl_stats_get_parse(const struct nlmsghdr *nlh,
5703 				u32 filter_mask,
5704 				struct rtnl_stats_dump_filters *filters,
5705 				struct netlink_ext_ack *extack)
5706 {
5707 	struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1];
5708 	int err;
5709 	int i;
5710 
5711 	filters->mask[0] = filter_mask;
5712 	for (i = 1; i < ARRAY_SIZE(filters->mask); i++)
5713 		filters->mask[i] = -1U;
5714 
5715 	err = nlmsg_parse(nlh, sizeof(struct if_stats_msg), tb,
5716 			  IFLA_STATS_GETSET_MAX, rtnl_stats_get_policy, extack);
5717 	if (err < 0)
5718 		return err;
5719 
5720 	if (tb[IFLA_STATS_GET_FILTERS]) {
5721 		err = rtnl_stats_get_parse_filters(tb[IFLA_STATS_GET_FILTERS],
5722 						   filters, extack);
5723 		if (err)
5724 			return err;
5725 	}
5726 
5727 	return 0;
5728 }
5729 
rtnl_valid_stats_req(const struct nlmsghdr * nlh,bool strict_check,bool is_dump,struct netlink_ext_ack * extack)5730 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
5731 				bool is_dump, struct netlink_ext_ack *extack)
5732 {
5733 	struct if_stats_msg *ifsm;
5734 
5735 	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
5736 		NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
5737 		return -EINVAL;
5738 	}
5739 
5740 	if (!strict_check)
5741 		return 0;
5742 
5743 	ifsm = nlmsg_data(nlh);
5744 
5745 	/* only requests using strict checks can pass data to influence
5746 	 * the dump. The legacy exception is filter_mask.
5747 	 */
5748 	if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
5749 		NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
5750 		return -EINVAL;
5751 	}
5752 	if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5753 		NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5754 		return -EINVAL;
5755 	}
5756 
5757 	return 0;
5758 }
5759 
rtnl_stats_get(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5760 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5761 			  struct netlink_ext_ack *extack)
5762 {
5763 	struct rtnl_stats_dump_filters filters;
5764 	struct net *net = sock_net(skb->sk);
5765 	struct net_device *dev = NULL;
5766 	int idxattr = 0, prividx = 0;
5767 	struct if_stats_msg *ifsm;
5768 	struct sk_buff *nskb;
5769 	int err;
5770 
5771 	err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5772 				   false, extack);
5773 	if (err)
5774 		return err;
5775 
5776 	ifsm = nlmsg_data(nlh);
5777 	if (ifsm->ifindex > 0)
5778 		dev = __dev_get_by_index(net, ifsm->ifindex);
5779 	else
5780 		return -EINVAL;
5781 
5782 	if (!dev)
5783 		return -ENODEV;
5784 
5785 	if (!ifsm->filter_mask) {
5786 		NL_SET_ERR_MSG(extack, "Filter mask must be set for stats get");
5787 		return -EINVAL;
5788 	}
5789 
5790 	err = rtnl_stats_get_parse(nlh, ifsm->filter_mask, &filters, extack);
5791 	if (err)
5792 		return err;
5793 
5794 	nskb = nlmsg_new(if_nlmsg_stats_size(dev, &filters), GFP_KERNEL);
5795 	if (!nskb)
5796 		return -ENOBUFS;
5797 
5798 	err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5799 				  NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5800 				  0, &filters, &idxattr, &prividx, extack);
5801 	if (err < 0) {
5802 		/* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5803 		WARN_ON(err == -EMSGSIZE);
5804 		kfree_skb(nskb);
5805 	} else {
5806 		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5807 	}
5808 
5809 	return err;
5810 }
5811 
rtnl_stats_dump(struct sk_buff * skb,struct netlink_callback * cb)5812 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5813 {
5814 	struct netlink_ext_ack *extack = cb->extack;
5815 	int h, s_h, err, s_idx, s_idxattr, s_prividx;
5816 	struct rtnl_stats_dump_filters filters;
5817 	struct net *net = sock_net(skb->sk);
5818 	unsigned int flags = NLM_F_MULTI;
5819 	struct if_stats_msg *ifsm;
5820 	struct hlist_head *head;
5821 	struct net_device *dev;
5822 	int idx = 0;
5823 
5824 	s_h = cb->args[0];
5825 	s_idx = cb->args[1];
5826 	s_idxattr = cb->args[2];
5827 	s_prividx = cb->args[3];
5828 
5829 	cb->seq = net->dev_base_seq;
5830 
5831 	err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5832 	if (err)
5833 		return err;
5834 
5835 	ifsm = nlmsg_data(cb->nlh);
5836 	if (!ifsm->filter_mask) {
5837 		NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5838 		return -EINVAL;
5839 	}
5840 
5841 	err = rtnl_stats_get_parse(cb->nlh, ifsm->filter_mask, &filters,
5842 				   extack);
5843 	if (err)
5844 		return err;
5845 
5846 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5847 		idx = 0;
5848 		head = &net->dev_index_head[h];
5849 		hlist_for_each_entry(dev, head, index_hlist) {
5850 			if (idx < s_idx)
5851 				goto cont;
5852 			err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5853 						  NETLINK_CB(cb->skb).portid,
5854 						  cb->nlh->nlmsg_seq, 0,
5855 						  flags, &filters,
5856 						  &s_idxattr, &s_prividx,
5857 						  extack);
5858 			/* If we ran out of room on the first message,
5859 			 * we're in trouble
5860 			 */
5861 			WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5862 
5863 			if (err < 0)
5864 				goto out;
5865 			s_prividx = 0;
5866 			s_idxattr = 0;
5867 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5868 cont:
5869 			idx++;
5870 		}
5871 	}
5872 out:
5873 	cb->args[3] = s_prividx;
5874 	cb->args[2] = s_idxattr;
5875 	cb->args[1] = idx;
5876 	cb->args[0] = h;
5877 
5878 	return skb->len;
5879 }
5880 
rtnl_offload_xstats_notify(struct net_device * dev)5881 void rtnl_offload_xstats_notify(struct net_device *dev)
5882 {
5883 	struct rtnl_stats_dump_filters response_filters = {};
5884 	struct net *net = dev_net(dev);
5885 	int idxattr = 0, prividx = 0;
5886 	struct sk_buff *skb;
5887 	int err = -ENOBUFS;
5888 
5889 	ASSERT_RTNL();
5890 
5891 	response_filters.mask[0] |=
5892 		IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_OFFLOAD_XSTATS);
5893 	response_filters.mask[IFLA_STATS_LINK_OFFLOAD_XSTATS] |=
5894 		IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO);
5895 
5896 	skb = nlmsg_new(if_nlmsg_stats_size(dev, &response_filters),
5897 			GFP_KERNEL);
5898 	if (!skb)
5899 		goto errout;
5900 
5901 	err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 0, 0, 0, 0,
5902 				  &response_filters, &idxattr, &prividx, NULL);
5903 	if (err < 0) {
5904 		kfree_skb(skb);
5905 		goto errout;
5906 	}
5907 
5908 	rtnl_notify(skb, net, 0, RTNLGRP_STATS, NULL, GFP_KERNEL);
5909 	return;
5910 
5911 errout:
5912 	rtnl_set_sk_err(net, RTNLGRP_STATS, err);
5913 }
5914 EXPORT_SYMBOL(rtnl_offload_xstats_notify);
5915 
rtnl_stats_set(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5916 static int rtnl_stats_set(struct sk_buff *skb, struct nlmsghdr *nlh,
5917 			  struct netlink_ext_ack *extack)
5918 {
5919 	enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5920 	struct rtnl_stats_dump_filters response_filters = {};
5921 	struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1];
5922 	struct net *net = sock_net(skb->sk);
5923 	struct net_device *dev = NULL;
5924 	struct if_stats_msg *ifsm;
5925 	bool notify = false;
5926 	int err;
5927 
5928 	err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5929 				   false, extack);
5930 	if (err)
5931 		return err;
5932 
5933 	ifsm = nlmsg_data(nlh);
5934 	if (ifsm->family != AF_UNSPEC) {
5935 		NL_SET_ERR_MSG(extack, "Address family should be AF_UNSPEC");
5936 		return -EINVAL;
5937 	}
5938 
5939 	if (ifsm->ifindex > 0)
5940 		dev = __dev_get_by_index(net, ifsm->ifindex);
5941 	else
5942 		return -EINVAL;
5943 
5944 	if (!dev)
5945 		return -ENODEV;
5946 
5947 	if (ifsm->filter_mask) {
5948 		NL_SET_ERR_MSG(extack, "Filter mask must be 0 for stats set");
5949 		return -EINVAL;
5950 	}
5951 
5952 	err = nlmsg_parse(nlh, sizeof(*ifsm), tb, IFLA_STATS_GETSET_MAX,
5953 			  ifla_stats_set_policy, extack);
5954 	if (err < 0)
5955 		return err;
5956 
5957 	if (tb[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS]) {
5958 		u8 req = nla_get_u8(tb[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS]);
5959 
5960 		if (req)
5961 			err = netdev_offload_xstats_enable(dev, t_l3, extack);
5962 		else
5963 			err = netdev_offload_xstats_disable(dev, t_l3);
5964 
5965 		if (!err)
5966 			notify = true;
5967 		else if (err != -EALREADY)
5968 			return err;
5969 
5970 		response_filters.mask[0] |=
5971 			IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_OFFLOAD_XSTATS);
5972 		response_filters.mask[IFLA_STATS_LINK_OFFLOAD_XSTATS] |=
5973 			IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO);
5974 	}
5975 
5976 	if (notify)
5977 		rtnl_offload_xstats_notify(dev);
5978 
5979 	return 0;
5980 }
5981 
5982 /* Process one rtnetlink message. */
5983 
rtnetlink_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5984 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5985 			     struct netlink_ext_ack *extack)
5986 {
5987 	struct net *net = sock_net(skb->sk);
5988 	struct rtnl_link *link;
5989 	enum rtnl_kinds kind;
5990 	struct module *owner;
5991 	int err = -EOPNOTSUPP;
5992 	rtnl_doit_func doit;
5993 	unsigned int flags;
5994 	int family;
5995 	int type;
5996 
5997 	type = nlh->nlmsg_type;
5998 	if (type > RTM_MAX)
5999 		return -EOPNOTSUPP;
6000 
6001 	type -= RTM_BASE;
6002 
6003 	/* All the messages must have at least 1 byte length */
6004 	if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
6005 		return 0;
6006 
6007 	family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
6008 	kind = rtnl_msgtype_kind(type);
6009 
6010 	if (kind != RTNL_KIND_GET && !netlink_net_capable(skb, CAP_NET_ADMIN))
6011 		return -EPERM;
6012 
6013 	rcu_read_lock();
6014 	if (kind == RTNL_KIND_GET && (nlh->nlmsg_flags & NLM_F_DUMP)) {
6015 		struct sock *rtnl;
6016 		rtnl_dumpit_func dumpit;
6017 		u32 min_dump_alloc = 0;
6018 
6019 		link = rtnl_get_link(family, type);
6020 		if (!link || !link->dumpit) {
6021 			family = PF_UNSPEC;
6022 			link = rtnl_get_link(family, type);
6023 			if (!link || !link->dumpit)
6024 				goto err_unlock;
6025 		}
6026 		owner = link->owner;
6027 		dumpit = link->dumpit;
6028 
6029 		if (type == RTM_GETLINK - RTM_BASE)
6030 			min_dump_alloc = rtnl_calcit(skb, nlh);
6031 
6032 		err = 0;
6033 		/* need to do this before rcu_read_unlock() */
6034 		if (!try_module_get(owner))
6035 			err = -EPROTONOSUPPORT;
6036 
6037 		rcu_read_unlock();
6038 
6039 		rtnl = net->rtnl;
6040 		if (err == 0) {
6041 			struct netlink_dump_control c = {
6042 				.dump		= dumpit,
6043 				.min_dump_alloc	= min_dump_alloc,
6044 				.module		= owner,
6045 			};
6046 			err = netlink_dump_start(rtnl, skb, nlh, &c);
6047 			/* netlink_dump_start() will keep a reference on
6048 			 * module if dump is still in progress.
6049 			 */
6050 			module_put(owner);
6051 		}
6052 		return err;
6053 	}
6054 
6055 	link = rtnl_get_link(family, type);
6056 	if (!link || !link->doit) {
6057 		family = PF_UNSPEC;
6058 		link = rtnl_get_link(PF_UNSPEC, type);
6059 		if (!link || !link->doit)
6060 			goto out_unlock;
6061 	}
6062 
6063 	owner = link->owner;
6064 	if (!try_module_get(owner)) {
6065 		err = -EPROTONOSUPPORT;
6066 		goto out_unlock;
6067 	}
6068 
6069 	flags = link->flags;
6070 	if (kind == RTNL_KIND_DEL && (nlh->nlmsg_flags & NLM_F_BULK) &&
6071 	    !(flags & RTNL_FLAG_BULK_DEL_SUPPORTED)) {
6072 		NL_SET_ERR_MSG(extack, "Bulk delete is not supported");
6073 		module_put(owner);
6074 		goto err_unlock;
6075 	}
6076 
6077 	if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
6078 		doit = link->doit;
6079 		rcu_read_unlock();
6080 		if (doit)
6081 			err = doit(skb, nlh, extack);
6082 		module_put(owner);
6083 		return err;
6084 	}
6085 	rcu_read_unlock();
6086 
6087 	rtnl_lock();
6088 	link = rtnl_get_link(family, type);
6089 	if (link && link->doit)
6090 		err = link->doit(skb, nlh, extack);
6091 	rtnl_unlock();
6092 
6093 	module_put(owner);
6094 
6095 	return err;
6096 
6097 out_unlock:
6098 	rcu_read_unlock();
6099 	return err;
6100 
6101 err_unlock:
6102 	rcu_read_unlock();
6103 	return -EOPNOTSUPP;
6104 }
6105 
rtnetlink_rcv(struct sk_buff * skb)6106 static void rtnetlink_rcv(struct sk_buff *skb)
6107 {
6108 	netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
6109 }
6110 
rtnetlink_bind(struct net * net,int group)6111 static int rtnetlink_bind(struct net *net, int group)
6112 {
6113 	switch (group) {
6114 	case RTNLGRP_IPV4_MROUTE_R:
6115 	case RTNLGRP_IPV6_MROUTE_R:
6116 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
6117 			return -EPERM;
6118 		break;
6119 	}
6120 	return 0;
6121 }
6122 
rtnetlink_event(struct notifier_block * this,unsigned long event,void * ptr)6123 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
6124 {
6125 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6126 
6127 	switch (event) {
6128 	case NETDEV_REBOOT:
6129 	case NETDEV_CHANGEMTU:
6130 	case NETDEV_CHANGEADDR:
6131 	case NETDEV_CHANGENAME:
6132 	case NETDEV_FEAT_CHANGE:
6133 	case NETDEV_BONDING_FAILOVER:
6134 	case NETDEV_POST_TYPE_CHANGE:
6135 	case NETDEV_NOTIFY_PEERS:
6136 	case NETDEV_CHANGEUPPER:
6137 	case NETDEV_RESEND_IGMP:
6138 	case NETDEV_CHANGEINFODATA:
6139 	case NETDEV_CHANGELOWERSTATE:
6140 	case NETDEV_CHANGE_TX_QUEUE_LEN:
6141 		rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
6142 				   GFP_KERNEL, NULL, 0);
6143 		break;
6144 	default:
6145 		break;
6146 	}
6147 	return NOTIFY_DONE;
6148 }
6149 
6150 static struct notifier_block rtnetlink_dev_notifier = {
6151 	.notifier_call	= rtnetlink_event,
6152 };
6153 
6154 
rtnetlink_net_init(struct net * net)6155 static int __net_init rtnetlink_net_init(struct net *net)
6156 {
6157 	struct sock *sk;
6158 	struct netlink_kernel_cfg cfg = {
6159 		.groups		= RTNLGRP_MAX,
6160 		.input		= rtnetlink_rcv,
6161 		.cb_mutex	= &rtnl_mutex,
6162 		.flags		= NL_CFG_F_NONROOT_RECV,
6163 		.bind		= rtnetlink_bind,
6164 	};
6165 
6166 	sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
6167 	if (!sk)
6168 		return -ENOMEM;
6169 	net->rtnl = sk;
6170 	return 0;
6171 }
6172 
rtnetlink_net_exit(struct net * net)6173 static void __net_exit rtnetlink_net_exit(struct net *net)
6174 {
6175 	netlink_kernel_release(net->rtnl);
6176 	net->rtnl = NULL;
6177 }
6178 
6179 static struct pernet_operations rtnetlink_net_ops = {
6180 	.init = rtnetlink_net_init,
6181 	.exit = rtnetlink_net_exit,
6182 };
6183 
rtnetlink_init(void)6184 void __init rtnetlink_init(void)
6185 {
6186 	if (register_pernet_subsys(&rtnetlink_net_ops))
6187 		panic("rtnetlink_init: cannot initialize rtnetlink\n");
6188 
6189 	register_netdevice_notifier(&rtnetlink_dev_notifier);
6190 
6191 	rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
6192 		      rtnl_dump_ifinfo, 0);
6193 	rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
6194 	rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
6195 	rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
6196 
6197 	rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
6198 	rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
6199 	rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
6200 
6201 	rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
6202 	rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
6203 
6204 	rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
6205 	rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL,
6206 		      RTNL_FLAG_BULK_DEL_SUPPORTED);
6207 	rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
6208 
6209 	rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
6210 	rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
6211 	rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
6212 
6213 	rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
6214 		      0);
6215 	rtnl_register(PF_UNSPEC, RTM_SETSTATS, rtnl_stats_set, NULL, 0);
6216 }
6217