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 #include <net/devlink.h>
57 #if IS_ENABLED(CONFIG_IPV6)
58 #include <net/addrconf.h>
59 #endif
60 
61 #include "dev.h"
62 
63 #define RTNL_MAX_TYPE		50
64 #define RTNL_SLAVE_MAX_TYPE	44
65 
66 struct rtnl_link {
67 	rtnl_doit_func		doit;
68 	rtnl_dumpit_func	dumpit;
69 	struct module		*owner;
70 	unsigned int		flags;
71 	struct rcu_head		rcu;
72 };
73 
74 static DEFINE_MUTEX(rtnl_mutex);
75 
rtnl_lock(void)76 void rtnl_lock(void)
77 {
78 	mutex_lock(&rtnl_mutex);
79 }
80 EXPORT_SYMBOL(rtnl_lock);
81 
rtnl_lock_killable(void)82 int rtnl_lock_killable(void)
83 {
84 	return mutex_lock_killable(&rtnl_mutex);
85 }
86 EXPORT_SYMBOL(rtnl_lock_killable);
87 
88 static struct sk_buff *defer_kfree_skb_list;
rtnl_kfree_skbs(struct sk_buff * head,struct sk_buff * tail)89 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
90 {
91 	if (head && tail) {
92 		tail->next = defer_kfree_skb_list;
93 		defer_kfree_skb_list = head;
94 	}
95 }
96 EXPORT_SYMBOL(rtnl_kfree_skbs);
97 
__rtnl_unlock(void)98 void __rtnl_unlock(void)
99 {
100 	struct sk_buff *head = defer_kfree_skb_list;
101 
102 	defer_kfree_skb_list = NULL;
103 
104 	/* Ensure that we didn't actually add any TODO item when __rtnl_unlock()
105 	 * is used. In some places, e.g. in cfg80211, we have code that will do
106 	 * something like
107 	 *   rtnl_lock()
108 	 *   wiphy_lock()
109 	 *   ...
110 	 *   rtnl_unlock()
111 	 *
112 	 * and because netdev_run_todo() acquires the RTNL for items on the list
113 	 * we could cause a situation such as this:
114 	 * Thread 1			Thread 2
115 	 *				  rtnl_lock()
116 	 *				  unregister_netdevice()
117 	 *				  __rtnl_unlock()
118 	 * rtnl_lock()
119 	 * wiphy_lock()
120 	 * rtnl_unlock()
121 	 *   netdev_run_todo()
122 	 *     __rtnl_unlock()
123 	 *
124 	 *     // list not empty now
125 	 *     // because of thread 2
126 	 *				  rtnl_lock()
127 	 *     while (!list_empty(...))
128 	 *       rtnl_lock()
129 	 *				  wiphy_lock()
130 	 * **** DEADLOCK ****
131 	 *
132 	 * However, usage of __rtnl_unlock() is rare, and so we can ensure that
133 	 * it's not used in cases where something is added to do the list.
134 	 */
135 	WARN_ON(!list_empty(&net_todo_list));
136 
137 	mutex_unlock(&rtnl_mutex);
138 
139 	while (head) {
140 		struct sk_buff *next = head->next;
141 
142 		kfree_skb(head);
143 		cond_resched();
144 		head = next;
145 	}
146 }
147 
rtnl_unlock(void)148 void rtnl_unlock(void)
149 {
150 	/* This fellow will unlock it for us. */
151 	netdev_run_todo();
152 }
153 EXPORT_SYMBOL(rtnl_unlock);
154 
rtnl_trylock(void)155 int rtnl_trylock(void)
156 {
157 	return mutex_trylock(&rtnl_mutex);
158 }
159 EXPORT_SYMBOL(rtnl_trylock);
160 
rtnl_is_locked(void)161 int rtnl_is_locked(void)
162 {
163 	return mutex_is_locked(&rtnl_mutex);
164 }
165 EXPORT_SYMBOL(rtnl_is_locked);
166 
refcount_dec_and_rtnl_lock(refcount_t * r)167 bool refcount_dec_and_rtnl_lock(refcount_t *r)
168 {
169 	return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
170 }
171 EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
172 
173 #ifdef CONFIG_PROVE_LOCKING
lockdep_rtnl_is_held(void)174 bool lockdep_rtnl_is_held(void)
175 {
176 	return lockdep_is_held(&rtnl_mutex);
177 }
178 EXPORT_SYMBOL(lockdep_rtnl_is_held);
179 #endif /* #ifdef CONFIG_PROVE_LOCKING */
180 
181 static struct rtnl_link __rcu *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
182 
rtm_msgindex(int msgtype)183 static inline int rtm_msgindex(int msgtype)
184 {
185 	int msgindex = msgtype - RTM_BASE;
186 
187 	/*
188 	 * msgindex < 0 implies someone tried to register a netlink
189 	 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
190 	 * the message type has not been added to linux/rtnetlink.h
191 	 */
192 	BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
193 
194 	return msgindex;
195 }
196 
rtnl_get_link(int protocol,int msgtype)197 static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
198 {
199 	struct rtnl_link __rcu **tab;
200 
201 	if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
202 		protocol = PF_UNSPEC;
203 
204 	tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
205 	if (!tab)
206 		tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
207 
208 	return rcu_dereference_rtnl(tab[msgtype]);
209 }
210 
rtnl_register_internal(struct module * owner,int protocol,int msgtype,rtnl_doit_func doit,rtnl_dumpit_func dumpit,unsigned int flags)211 static int rtnl_register_internal(struct module *owner,
212 				  int protocol, int msgtype,
213 				  rtnl_doit_func doit, rtnl_dumpit_func dumpit,
214 				  unsigned int flags)
215 {
216 	struct rtnl_link *link, *old;
217 	struct rtnl_link __rcu **tab;
218 	int msgindex;
219 	int ret = -ENOBUFS;
220 
221 	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
222 	msgindex = rtm_msgindex(msgtype);
223 
224 	rtnl_lock();
225 	tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
226 	if (tab == NULL) {
227 		tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
228 		if (!tab)
229 			goto unlock;
230 
231 		/* ensures we see the 0 stores */
232 		rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
233 	}
234 
235 	old = rtnl_dereference(tab[msgindex]);
236 	if (old) {
237 		link = kmemdup(old, sizeof(*old), GFP_KERNEL);
238 		if (!link)
239 			goto unlock;
240 	} else {
241 		link = kzalloc(sizeof(*link), GFP_KERNEL);
242 		if (!link)
243 			goto unlock;
244 	}
245 
246 	WARN_ON(link->owner && link->owner != owner);
247 	link->owner = owner;
248 
249 	WARN_ON(doit && link->doit && link->doit != doit);
250 	if (doit)
251 		link->doit = doit;
252 	WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
253 	if (dumpit)
254 		link->dumpit = dumpit;
255 
256 	WARN_ON(rtnl_msgtype_kind(msgtype) != RTNL_KIND_DEL &&
257 		(flags & RTNL_FLAG_BULK_DEL_SUPPORTED));
258 	link->flags |= flags;
259 
260 	/* publish protocol:msgtype */
261 	rcu_assign_pointer(tab[msgindex], link);
262 	ret = 0;
263 	if (old)
264 		kfree_rcu(old, rcu);
265 unlock:
266 	rtnl_unlock();
267 	return ret;
268 }
269 
270 /**
271  * rtnl_register_module - Register a rtnetlink message type
272  *
273  * @owner: module registering the hook (THIS_MODULE)
274  * @protocol: Protocol family or PF_UNSPEC
275  * @msgtype: rtnetlink message type
276  * @doit: Function pointer called for each request message
277  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
278  * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
279  *
280  * Like rtnl_register, but for use by removable modules.
281  */
rtnl_register_module(struct module * owner,int protocol,int msgtype,rtnl_doit_func doit,rtnl_dumpit_func dumpit,unsigned int flags)282 int rtnl_register_module(struct module *owner,
283 			 int protocol, int msgtype,
284 			 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
285 			 unsigned int flags)
286 {
287 	return rtnl_register_internal(owner, protocol, msgtype,
288 				      doit, dumpit, flags);
289 }
290 EXPORT_SYMBOL_GPL(rtnl_register_module);
291 
292 /**
293  * rtnl_register - Register a rtnetlink message type
294  * @protocol: Protocol family or PF_UNSPEC
295  * @msgtype: rtnetlink message type
296  * @doit: Function pointer called for each request message
297  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
298  * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
299  *
300  * Registers the specified function pointers (at least one of them has
301  * to be non-NULL) to be called whenever a request message for the
302  * specified protocol family and message type is received.
303  *
304  * The special protocol family PF_UNSPEC may be used to define fallback
305  * function pointers for the case when no entry for the specific protocol
306  * family exists.
307  */
rtnl_register(int protocol,int msgtype,rtnl_doit_func doit,rtnl_dumpit_func dumpit,unsigned int flags)308 void rtnl_register(int protocol, int msgtype,
309 		   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
310 		   unsigned int flags)
311 {
312 	int err;
313 
314 	err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
315 				     flags);
316 	if (err)
317 		pr_err("Unable to register rtnetlink message handler, "
318 		       "protocol = %d, message type = %d\n", protocol, msgtype);
319 }
320 
321 /**
322  * rtnl_unregister - Unregister a rtnetlink message type
323  * @protocol: Protocol family or PF_UNSPEC
324  * @msgtype: rtnetlink message type
325  *
326  * Returns 0 on success or a negative error code.
327  */
rtnl_unregister(int protocol,int msgtype)328 int rtnl_unregister(int protocol, int msgtype)
329 {
330 	struct rtnl_link __rcu **tab;
331 	struct rtnl_link *link;
332 	int msgindex;
333 
334 	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
335 	msgindex = rtm_msgindex(msgtype);
336 
337 	rtnl_lock();
338 	tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
339 	if (!tab) {
340 		rtnl_unlock();
341 		return -ENOENT;
342 	}
343 
344 	link = rtnl_dereference(tab[msgindex]);
345 	RCU_INIT_POINTER(tab[msgindex], NULL);
346 	rtnl_unlock();
347 
348 	kfree_rcu(link, rcu);
349 
350 	return 0;
351 }
352 EXPORT_SYMBOL_GPL(rtnl_unregister);
353 
354 /**
355  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
356  * @protocol : Protocol family or PF_UNSPEC
357  *
358  * Identical to calling rtnl_unregster() for all registered message types
359  * of a certain protocol family.
360  */
rtnl_unregister_all(int protocol)361 void rtnl_unregister_all(int protocol)
362 {
363 	struct rtnl_link __rcu **tab;
364 	struct rtnl_link *link;
365 	int msgindex;
366 
367 	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
368 
369 	rtnl_lock();
370 	tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
371 	if (!tab) {
372 		rtnl_unlock();
373 		return;
374 	}
375 	RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
376 	for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
377 		link = rtnl_dereference(tab[msgindex]);
378 		if (!link)
379 			continue;
380 
381 		RCU_INIT_POINTER(tab[msgindex], NULL);
382 		kfree_rcu(link, rcu);
383 	}
384 	rtnl_unlock();
385 
386 	synchronize_net();
387 
388 	kfree(tab);
389 }
390 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
391 
392 static LIST_HEAD(link_ops);
393 
rtnl_link_ops_get(const char * kind)394 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
395 {
396 	const struct rtnl_link_ops *ops;
397 
398 	list_for_each_entry(ops, &link_ops, list) {
399 		if (!strcmp(ops->kind, kind))
400 			return ops;
401 	}
402 	return NULL;
403 }
404 
405 /**
406  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
407  * @ops: struct rtnl_link_ops * to register
408  *
409  * The caller must hold the rtnl_mutex. This function should be used
410  * by drivers that create devices during module initialization. It
411  * must be called before registering the devices.
412  *
413  * Returns 0 on success or a negative error code.
414  */
__rtnl_link_register(struct rtnl_link_ops * ops)415 int __rtnl_link_register(struct rtnl_link_ops *ops)
416 {
417 	if (rtnl_link_ops_get(ops->kind))
418 		return -EEXIST;
419 
420 	/* The check for alloc/setup is here because if ops
421 	 * does not have that filled up, it is not possible
422 	 * to use the ops for creating device. So do not
423 	 * fill up dellink as well. That disables rtnl_dellink.
424 	 */
425 	if ((ops->alloc || ops->setup) && !ops->dellink)
426 		ops->dellink = unregister_netdevice_queue;
427 
428 	list_add_tail(&ops->list, &link_ops);
429 	return 0;
430 }
431 EXPORT_SYMBOL_GPL(__rtnl_link_register);
432 
433 /**
434  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
435  * @ops: struct rtnl_link_ops * to register
436  *
437  * Returns 0 on success or a negative error code.
438  */
rtnl_link_register(struct rtnl_link_ops * ops)439 int rtnl_link_register(struct rtnl_link_ops *ops)
440 {
441 	int err;
442 
443 	/* Sanity-check max sizes to avoid stack buffer overflow. */
444 	if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
445 		    ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
446 		return -EINVAL;
447 
448 	rtnl_lock();
449 	err = __rtnl_link_register(ops);
450 	rtnl_unlock();
451 	return err;
452 }
453 EXPORT_SYMBOL_GPL(rtnl_link_register);
454 
__rtnl_kill_links(struct net * net,struct rtnl_link_ops * ops)455 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
456 {
457 	struct net_device *dev;
458 	LIST_HEAD(list_kill);
459 
460 	for_each_netdev(net, dev) {
461 		if (dev->rtnl_link_ops == ops)
462 			ops->dellink(dev, &list_kill);
463 	}
464 	unregister_netdevice_many(&list_kill);
465 }
466 
467 /**
468  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
469  * @ops: struct rtnl_link_ops * to unregister
470  *
471  * The caller must hold the rtnl_mutex and guarantee net_namespace_list
472  * integrity (hold pernet_ops_rwsem for writing to close the race
473  * with setup_net() and cleanup_net()).
474  */
__rtnl_link_unregister(struct rtnl_link_ops * ops)475 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
476 {
477 	struct net *net;
478 
479 	for_each_net(net) {
480 		__rtnl_kill_links(net, ops);
481 	}
482 	list_del(&ops->list);
483 }
484 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
485 
486 /* Return with the rtnl_lock held when there are no network
487  * devices unregistering in any network namespace.
488  */
rtnl_lock_unregistering_all(void)489 static void rtnl_lock_unregistering_all(void)
490 {
491 	struct net *net;
492 	bool unregistering;
493 	DEFINE_WAIT_FUNC(wait, woken_wake_function);
494 
495 	add_wait_queue(&netdev_unregistering_wq, &wait);
496 	for (;;) {
497 		unregistering = false;
498 		rtnl_lock();
499 		/* We held write locked pernet_ops_rwsem, and parallel
500 		 * setup_net() and cleanup_net() are not possible.
501 		 */
502 		for_each_net(net) {
503 			if (atomic_read(&net->dev_unreg_count) > 0) {
504 				unregistering = true;
505 				break;
506 			}
507 		}
508 		if (!unregistering)
509 			break;
510 		__rtnl_unlock();
511 
512 		wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
513 	}
514 	remove_wait_queue(&netdev_unregistering_wq, &wait);
515 }
516 
517 /**
518  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
519  * @ops: struct rtnl_link_ops * to unregister
520  */
rtnl_link_unregister(struct rtnl_link_ops * ops)521 void rtnl_link_unregister(struct rtnl_link_ops *ops)
522 {
523 	/* Close the race with setup_net() and cleanup_net() */
524 	down_write(&pernet_ops_rwsem);
525 	rtnl_lock_unregistering_all();
526 	__rtnl_link_unregister(ops);
527 	rtnl_unlock();
528 	up_write(&pernet_ops_rwsem);
529 }
530 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
531 
rtnl_link_get_slave_info_data_size(const struct net_device * dev)532 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
533 {
534 	struct net_device *master_dev;
535 	const struct rtnl_link_ops *ops;
536 	size_t size = 0;
537 
538 	rcu_read_lock();
539 
540 	master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
541 	if (!master_dev)
542 		goto out;
543 
544 	ops = master_dev->rtnl_link_ops;
545 	if (!ops || !ops->get_slave_size)
546 		goto out;
547 	/* IFLA_INFO_SLAVE_DATA + nested data */
548 	size = nla_total_size(sizeof(struct nlattr)) +
549 	       ops->get_slave_size(master_dev, dev);
550 
551 out:
552 	rcu_read_unlock();
553 	return size;
554 }
555 
rtnl_link_get_size(const struct net_device * dev)556 static size_t rtnl_link_get_size(const struct net_device *dev)
557 {
558 	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
559 	size_t size;
560 
561 	if (!ops)
562 		return 0;
563 
564 	size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
565 	       nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
566 
567 	if (ops->get_size)
568 		/* IFLA_INFO_DATA + nested data */
569 		size += nla_total_size(sizeof(struct nlattr)) +
570 			ops->get_size(dev);
571 
572 	if (ops->get_xstats_size)
573 		/* IFLA_INFO_XSTATS */
574 		size += nla_total_size(ops->get_xstats_size(dev));
575 
576 	size += rtnl_link_get_slave_info_data_size(dev);
577 
578 	return size;
579 }
580 
581 static LIST_HEAD(rtnl_af_ops);
582 
rtnl_af_lookup(const int family)583 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
584 {
585 	const struct rtnl_af_ops *ops;
586 
587 	ASSERT_RTNL();
588 
589 	list_for_each_entry(ops, &rtnl_af_ops, list) {
590 		if (ops->family == family)
591 			return ops;
592 	}
593 
594 	return NULL;
595 }
596 
597 /**
598  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
599  * @ops: struct rtnl_af_ops * to register
600  *
601  * Returns 0 on success or a negative error code.
602  */
rtnl_af_register(struct rtnl_af_ops * ops)603 void rtnl_af_register(struct rtnl_af_ops *ops)
604 {
605 	rtnl_lock();
606 	list_add_tail_rcu(&ops->list, &rtnl_af_ops);
607 	rtnl_unlock();
608 }
609 EXPORT_SYMBOL_GPL(rtnl_af_register);
610 
611 /**
612  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
613  * @ops: struct rtnl_af_ops * to unregister
614  */
rtnl_af_unregister(struct rtnl_af_ops * ops)615 void rtnl_af_unregister(struct rtnl_af_ops *ops)
616 {
617 	rtnl_lock();
618 	list_del_rcu(&ops->list);
619 	rtnl_unlock();
620 
621 	synchronize_rcu();
622 }
623 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
624 
rtnl_link_get_af_size(const struct net_device * dev,u32 ext_filter_mask)625 static size_t rtnl_link_get_af_size(const struct net_device *dev,
626 				    u32 ext_filter_mask)
627 {
628 	struct rtnl_af_ops *af_ops;
629 	size_t size;
630 
631 	/* IFLA_AF_SPEC */
632 	size = nla_total_size(sizeof(struct nlattr));
633 
634 	rcu_read_lock();
635 	list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
636 		if (af_ops->get_link_af_size) {
637 			/* AF_* + nested data */
638 			size += nla_total_size(sizeof(struct nlattr)) +
639 				af_ops->get_link_af_size(dev, ext_filter_mask);
640 		}
641 	}
642 	rcu_read_unlock();
643 
644 	return size;
645 }
646 
rtnl_have_link_slave_info(const struct net_device * dev)647 static bool rtnl_have_link_slave_info(const struct net_device *dev)
648 {
649 	struct net_device *master_dev;
650 	bool ret = false;
651 
652 	rcu_read_lock();
653 
654 	master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
655 	if (master_dev && master_dev->rtnl_link_ops)
656 		ret = true;
657 	rcu_read_unlock();
658 	return ret;
659 }
660 
rtnl_link_slave_info_fill(struct sk_buff * skb,const struct net_device * dev)661 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
662 				     const struct net_device *dev)
663 {
664 	struct net_device *master_dev;
665 	const struct rtnl_link_ops *ops;
666 	struct nlattr *slave_data;
667 	int err;
668 
669 	master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
670 	if (!master_dev)
671 		return 0;
672 	ops = master_dev->rtnl_link_ops;
673 	if (!ops)
674 		return 0;
675 	if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
676 		return -EMSGSIZE;
677 	if (ops->fill_slave_info) {
678 		slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA);
679 		if (!slave_data)
680 			return -EMSGSIZE;
681 		err = ops->fill_slave_info(skb, master_dev, dev);
682 		if (err < 0)
683 			goto err_cancel_slave_data;
684 		nla_nest_end(skb, slave_data);
685 	}
686 	return 0;
687 
688 err_cancel_slave_data:
689 	nla_nest_cancel(skb, slave_data);
690 	return err;
691 }
692 
rtnl_link_info_fill(struct sk_buff * skb,const struct net_device * dev)693 static int rtnl_link_info_fill(struct sk_buff *skb,
694 			       const struct net_device *dev)
695 {
696 	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
697 	struct nlattr *data;
698 	int err;
699 
700 	if (!ops)
701 		return 0;
702 	if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
703 		return -EMSGSIZE;
704 	if (ops->fill_xstats) {
705 		err = ops->fill_xstats(skb, dev);
706 		if (err < 0)
707 			return err;
708 	}
709 	if (ops->fill_info) {
710 		data = nla_nest_start_noflag(skb, IFLA_INFO_DATA);
711 		if (data == NULL)
712 			return -EMSGSIZE;
713 		err = ops->fill_info(skb, dev);
714 		if (err < 0)
715 			goto err_cancel_data;
716 		nla_nest_end(skb, data);
717 	}
718 	return 0;
719 
720 err_cancel_data:
721 	nla_nest_cancel(skb, data);
722 	return err;
723 }
724 
rtnl_link_fill(struct sk_buff * skb,const struct net_device * dev)725 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
726 {
727 	struct nlattr *linkinfo;
728 	int err = -EMSGSIZE;
729 
730 	linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO);
731 	if (linkinfo == NULL)
732 		goto out;
733 
734 	err = rtnl_link_info_fill(skb, dev);
735 	if (err < 0)
736 		goto err_cancel_link;
737 
738 	err = rtnl_link_slave_info_fill(skb, dev);
739 	if (err < 0)
740 		goto err_cancel_link;
741 
742 	nla_nest_end(skb, linkinfo);
743 	return 0;
744 
745 err_cancel_link:
746 	nla_nest_cancel(skb, linkinfo);
747 out:
748 	return err;
749 }
750 
rtnetlink_send(struct sk_buff * skb,struct net * net,u32 pid,unsigned int group,int echo)751 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
752 {
753 	struct sock *rtnl = net->rtnl;
754 
755 	return nlmsg_notify(rtnl, skb, pid, group, echo, GFP_KERNEL);
756 }
757 
rtnl_unicast(struct sk_buff * skb,struct net * net,u32 pid)758 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
759 {
760 	struct sock *rtnl = net->rtnl;
761 
762 	return nlmsg_unicast(rtnl, skb, pid);
763 }
764 EXPORT_SYMBOL(rtnl_unicast);
765 
rtnl_notify(struct sk_buff * skb,struct net * net,u32 pid,u32 group,const struct nlmsghdr * nlh,gfp_t flags)766 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
767 		 const struct nlmsghdr *nlh, gfp_t flags)
768 {
769 	struct sock *rtnl = net->rtnl;
770 
771 	nlmsg_notify(rtnl, skb, pid, group, nlmsg_report(nlh), flags);
772 }
773 EXPORT_SYMBOL(rtnl_notify);
774 
rtnl_set_sk_err(struct net * net,u32 group,int error)775 void rtnl_set_sk_err(struct net *net, u32 group, int error)
776 {
777 	struct sock *rtnl = net->rtnl;
778 
779 	netlink_set_err(rtnl, 0, group, error);
780 }
781 EXPORT_SYMBOL(rtnl_set_sk_err);
782 
rtnetlink_put_metrics(struct sk_buff * skb,u32 * metrics)783 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
784 {
785 	struct nlattr *mx;
786 	int i, valid = 0;
787 
788 	/* nothing is dumped for dst_default_metrics, so just skip the loop */
789 	if (metrics == dst_default_metrics.metrics)
790 		return 0;
791 
792 	mx = nla_nest_start_noflag(skb, RTA_METRICS);
793 	if (mx == NULL)
794 		return -ENOBUFS;
795 
796 	for (i = 0; i < RTAX_MAX; i++) {
797 		if (metrics[i]) {
798 			if (i == RTAX_CC_ALGO - 1) {
799 				char tmp[TCP_CA_NAME_MAX], *name;
800 
801 				name = tcp_ca_get_name_by_key(metrics[i], tmp);
802 				if (!name)
803 					continue;
804 				if (nla_put_string(skb, i + 1, name))
805 					goto nla_put_failure;
806 			} else if (i == RTAX_FEATURES - 1) {
807 				u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
808 
809 				if (!user_features)
810 					continue;
811 				BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
812 				if (nla_put_u32(skb, i + 1, user_features))
813 					goto nla_put_failure;
814 			} else {
815 				if (nla_put_u32(skb, i + 1, metrics[i]))
816 					goto nla_put_failure;
817 			}
818 			valid++;
819 		}
820 	}
821 
822 	if (!valid) {
823 		nla_nest_cancel(skb, mx);
824 		return 0;
825 	}
826 
827 	return nla_nest_end(skb, mx);
828 
829 nla_put_failure:
830 	nla_nest_cancel(skb, mx);
831 	return -EMSGSIZE;
832 }
833 EXPORT_SYMBOL(rtnetlink_put_metrics);
834 
rtnl_put_cacheinfo(struct sk_buff * skb,struct dst_entry * dst,u32 id,long expires,u32 error)835 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
836 		       long expires, u32 error)
837 {
838 	struct rta_cacheinfo ci = {
839 		.rta_error = error,
840 		.rta_id =  id,
841 	};
842 
843 	if (dst) {
844 		ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
845 		ci.rta_used = dst->__use;
846 		ci.rta_clntref = rcuref_read(&dst->__rcuref);
847 	}
848 	if (expires) {
849 		unsigned long clock;
850 
851 		clock = jiffies_to_clock_t(abs(expires));
852 		clock = min_t(unsigned long, clock, INT_MAX);
853 		ci.rta_expires = (expires > 0) ? clock : -clock;
854 	}
855 	return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
856 }
857 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
858 
set_operstate(struct net_device * dev,unsigned char transition)859 static void set_operstate(struct net_device *dev, unsigned char transition)
860 {
861 	unsigned char operstate = dev->operstate;
862 
863 	switch (transition) {
864 	case IF_OPER_UP:
865 		if ((operstate == IF_OPER_DORMANT ||
866 		     operstate == IF_OPER_TESTING ||
867 		     operstate == IF_OPER_UNKNOWN) &&
868 		    !netif_dormant(dev) && !netif_testing(dev))
869 			operstate = IF_OPER_UP;
870 		break;
871 
872 	case IF_OPER_TESTING:
873 		if (netif_oper_up(dev))
874 			operstate = IF_OPER_TESTING;
875 		break;
876 
877 	case IF_OPER_DORMANT:
878 		if (netif_oper_up(dev))
879 			operstate = IF_OPER_DORMANT;
880 		break;
881 	}
882 
883 	if (dev->operstate != operstate) {
884 		write_lock(&dev_base_lock);
885 		dev->operstate = operstate;
886 		write_unlock(&dev_base_lock);
887 		netdev_state_change(dev);
888 	}
889 }
890 
rtnl_dev_get_flags(const struct net_device * dev)891 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
892 {
893 	return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
894 	       (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
895 }
896 
rtnl_dev_combine_flags(const struct net_device * dev,const struct ifinfomsg * ifm)897 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
898 					   const struct ifinfomsg *ifm)
899 {
900 	unsigned int flags = ifm->ifi_flags;
901 
902 	/* bugwards compatibility: ifi_change == 0 is treated as ~0 */
903 	if (ifm->ifi_change)
904 		flags = (flags & ifm->ifi_change) |
905 			(rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
906 
907 	return flags;
908 }
909 
copy_rtnl_link_stats(struct rtnl_link_stats * a,const struct rtnl_link_stats64 * b)910 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
911 				 const struct rtnl_link_stats64 *b)
912 {
913 	a->rx_packets = b->rx_packets;
914 	a->tx_packets = b->tx_packets;
915 	a->rx_bytes = b->rx_bytes;
916 	a->tx_bytes = b->tx_bytes;
917 	a->rx_errors = b->rx_errors;
918 	a->tx_errors = b->tx_errors;
919 	a->rx_dropped = b->rx_dropped;
920 	a->tx_dropped = b->tx_dropped;
921 
922 	a->multicast = b->multicast;
923 	a->collisions = b->collisions;
924 
925 	a->rx_length_errors = b->rx_length_errors;
926 	a->rx_over_errors = b->rx_over_errors;
927 	a->rx_crc_errors = b->rx_crc_errors;
928 	a->rx_frame_errors = b->rx_frame_errors;
929 	a->rx_fifo_errors = b->rx_fifo_errors;
930 	a->rx_missed_errors = b->rx_missed_errors;
931 
932 	a->tx_aborted_errors = b->tx_aborted_errors;
933 	a->tx_carrier_errors = b->tx_carrier_errors;
934 	a->tx_fifo_errors = b->tx_fifo_errors;
935 	a->tx_heartbeat_errors = b->tx_heartbeat_errors;
936 	a->tx_window_errors = b->tx_window_errors;
937 
938 	a->rx_compressed = b->rx_compressed;
939 	a->tx_compressed = b->tx_compressed;
940 
941 	a->rx_nohandler = b->rx_nohandler;
942 }
943 
944 /* All VF info */
rtnl_vfinfo_size(const struct net_device * dev,u32 ext_filter_mask)945 static inline int rtnl_vfinfo_size(const struct net_device *dev,
946 				   u32 ext_filter_mask)
947 {
948 	if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
949 		int num_vfs = dev_num_vf(dev->dev.parent);
950 		size_t size = nla_total_size(0);
951 		size += num_vfs *
952 			(nla_total_size(0) +
953 			 nla_total_size(sizeof(struct ifla_vf_mac)) +
954 			 nla_total_size(sizeof(struct ifla_vf_broadcast)) +
955 			 nla_total_size(sizeof(struct ifla_vf_vlan)) +
956 			 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
957 			 nla_total_size(MAX_VLAN_LIST_LEN *
958 					sizeof(struct ifla_vf_vlan_info)) +
959 			 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
960 			 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
961 			 nla_total_size(sizeof(struct ifla_vf_rate)) +
962 			 nla_total_size(sizeof(struct ifla_vf_link_state)) +
963 			 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
964 			 nla_total_size(sizeof(struct ifla_vf_trust)));
965 		if (~ext_filter_mask & RTEXT_FILTER_SKIP_STATS) {
966 			size += num_vfs *
967 				(nla_total_size(0) + /* nest IFLA_VF_STATS */
968 				 /* IFLA_VF_STATS_RX_PACKETS */
969 				 nla_total_size_64bit(sizeof(__u64)) +
970 				 /* IFLA_VF_STATS_TX_PACKETS */
971 				 nla_total_size_64bit(sizeof(__u64)) +
972 				 /* IFLA_VF_STATS_RX_BYTES */
973 				 nla_total_size_64bit(sizeof(__u64)) +
974 				 /* IFLA_VF_STATS_TX_BYTES */
975 				 nla_total_size_64bit(sizeof(__u64)) +
976 				 /* IFLA_VF_STATS_BROADCAST */
977 				 nla_total_size_64bit(sizeof(__u64)) +
978 				 /* IFLA_VF_STATS_MULTICAST */
979 				 nla_total_size_64bit(sizeof(__u64)) +
980 				 /* IFLA_VF_STATS_RX_DROPPED */
981 				 nla_total_size_64bit(sizeof(__u64)) +
982 				 /* IFLA_VF_STATS_TX_DROPPED */
983 				 nla_total_size_64bit(sizeof(__u64)));
984 		}
985 		return size;
986 	} else
987 		return 0;
988 }
989 
rtnl_port_size(const struct net_device * dev,u32 ext_filter_mask)990 static size_t rtnl_port_size(const struct net_device *dev,
991 			     u32 ext_filter_mask)
992 {
993 	size_t port_size = nla_total_size(4)		/* PORT_VF */
994 		+ nla_total_size(PORT_PROFILE_MAX)	/* PORT_PROFILE */
995 		+ nla_total_size(PORT_UUID_MAX)		/* PORT_INSTANCE_UUID */
996 		+ nla_total_size(PORT_UUID_MAX)		/* PORT_HOST_UUID */
997 		+ nla_total_size(1)			/* PROT_VDP_REQUEST */
998 		+ nla_total_size(2);			/* PORT_VDP_RESPONSE */
999 	size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
1000 	size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
1001 		+ port_size;
1002 	size_t port_self_size = nla_total_size(sizeof(struct nlattr))
1003 		+ port_size;
1004 
1005 	if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1006 	    !(ext_filter_mask & RTEXT_FILTER_VF))
1007 		return 0;
1008 	if (dev_num_vf(dev->dev.parent))
1009 		return port_self_size + vf_ports_size +
1010 			vf_port_size * dev_num_vf(dev->dev.parent);
1011 	else
1012 		return port_self_size;
1013 }
1014 
rtnl_xdp_size(void)1015 static size_t rtnl_xdp_size(void)
1016 {
1017 	size_t xdp_size = nla_total_size(0) +	/* nest IFLA_XDP */
1018 			  nla_total_size(1) +	/* XDP_ATTACHED */
1019 			  nla_total_size(4) +	/* XDP_PROG_ID (or 1st mode) */
1020 			  nla_total_size(4);	/* XDP_<mode>_PROG_ID */
1021 
1022 	return xdp_size;
1023 }
1024 
rtnl_prop_list_size(const struct net_device * dev)1025 static size_t rtnl_prop_list_size(const struct net_device *dev)
1026 {
1027 	struct netdev_name_node *name_node;
1028 	size_t size;
1029 
1030 	if (list_empty(&dev->name_node->list))
1031 		return 0;
1032 	size = nla_total_size(0);
1033 	list_for_each_entry(name_node, &dev->name_node->list, list)
1034 		size += nla_total_size(ALTIFNAMSIZ);
1035 	return size;
1036 }
1037 
rtnl_proto_down_size(const struct net_device * dev)1038 static size_t rtnl_proto_down_size(const struct net_device *dev)
1039 {
1040 	size_t size = nla_total_size(1);
1041 
1042 	if (dev->proto_down_reason)
1043 		size += nla_total_size(0) + nla_total_size(4);
1044 
1045 	return size;
1046 }
1047 
rtnl_devlink_port_size(const struct net_device * dev)1048 static size_t rtnl_devlink_port_size(const struct net_device *dev)
1049 {
1050 	size_t size = nla_total_size(0); /* nest IFLA_DEVLINK_PORT */
1051 
1052 	if (dev->devlink_port)
1053 		size += devlink_nl_port_handle_size(dev->devlink_port);
1054 
1055 	return size;
1056 }
1057 
if_nlmsg_size(const struct net_device * dev,u32 ext_filter_mask)1058 static noinline size_t if_nlmsg_size(const struct net_device *dev,
1059 				     u32 ext_filter_mask)
1060 {
1061 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
1062 	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
1063 	       + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
1064 	       + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
1065 	       + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
1066 	       + nla_total_size(sizeof(struct rtnl_link_stats))
1067 	       + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
1068 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
1069 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
1070 	       + nla_total_size(4) /* IFLA_TXQLEN */
1071 	       + nla_total_size(4) /* IFLA_WEIGHT */
1072 	       + nla_total_size(4) /* IFLA_MTU */
1073 	       + nla_total_size(4) /* IFLA_LINK */
1074 	       + nla_total_size(4) /* IFLA_MASTER */
1075 	       + nla_total_size(1) /* IFLA_CARRIER */
1076 	       + nla_total_size(4) /* IFLA_PROMISCUITY */
1077 	       + nla_total_size(4) /* IFLA_ALLMULTI */
1078 	       + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1079 	       + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1080 	       + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1081 	       + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1082 	       + nla_total_size(4) /* IFLA_GRO_MAX_SIZE */
1083 	       + nla_total_size(4) /* IFLA_GSO_IPV4_MAX_SIZE */
1084 	       + nla_total_size(4) /* IFLA_GRO_IPV4_MAX_SIZE */
1085 	       + nla_total_size(4) /* IFLA_TSO_MAX_SIZE */
1086 	       + nla_total_size(4) /* IFLA_TSO_MAX_SEGS */
1087 	       + nla_total_size(1) /* IFLA_OPERSTATE */
1088 	       + nla_total_size(1) /* IFLA_LINKMODE */
1089 	       + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1090 	       + nla_total_size(4) /* IFLA_LINK_NETNSID */
1091 	       + nla_total_size(4) /* IFLA_GROUP */
1092 	       + nla_total_size(ext_filter_mask
1093 			        & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1094 	       + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1095 	       + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1096 	       + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1097 	       + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1098 	       + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1099 	       + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1100 	       + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1101 	       + rtnl_xdp_size() /* IFLA_XDP */
1102 	       + nla_total_size(4)  /* IFLA_EVENT */
1103 	       + nla_total_size(4)  /* IFLA_NEW_NETNSID */
1104 	       + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
1105 	       + rtnl_proto_down_size(dev)  /* proto down */
1106 	       + nla_total_size(4)  /* IFLA_TARGET_NETNSID */
1107 	       + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
1108 	       + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
1109 	       + nla_total_size(4)  /* IFLA_MIN_MTU */
1110 	       + nla_total_size(4)  /* IFLA_MAX_MTU */
1111 	       + rtnl_prop_list_size(dev)
1112 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
1113 	       + rtnl_devlink_port_size(dev)
1114 	       + 0;
1115 }
1116 
rtnl_vf_ports_fill(struct sk_buff * skb,struct net_device * dev)1117 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1118 {
1119 	struct nlattr *vf_ports;
1120 	struct nlattr *vf_port;
1121 	int vf;
1122 	int err;
1123 
1124 	vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
1125 	if (!vf_ports)
1126 		return -EMSGSIZE;
1127 
1128 	for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1129 		vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
1130 		if (!vf_port)
1131 			goto nla_put_failure;
1132 		if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1133 			goto nla_put_failure;
1134 		err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1135 		if (err == -EMSGSIZE)
1136 			goto nla_put_failure;
1137 		if (err) {
1138 			nla_nest_cancel(skb, vf_port);
1139 			continue;
1140 		}
1141 		nla_nest_end(skb, vf_port);
1142 	}
1143 
1144 	nla_nest_end(skb, vf_ports);
1145 
1146 	return 0;
1147 
1148 nla_put_failure:
1149 	nla_nest_cancel(skb, vf_ports);
1150 	return -EMSGSIZE;
1151 }
1152 
rtnl_port_self_fill(struct sk_buff * skb,struct net_device * dev)1153 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1154 {
1155 	struct nlattr *port_self;
1156 	int err;
1157 
1158 	port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
1159 	if (!port_self)
1160 		return -EMSGSIZE;
1161 
1162 	err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1163 	if (err) {
1164 		nla_nest_cancel(skb, port_self);
1165 		return (err == -EMSGSIZE) ? err : 0;
1166 	}
1167 
1168 	nla_nest_end(skb, port_self);
1169 
1170 	return 0;
1171 }
1172 
rtnl_port_fill(struct sk_buff * skb,struct net_device * dev,u32 ext_filter_mask)1173 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1174 			  u32 ext_filter_mask)
1175 {
1176 	int err;
1177 
1178 	if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1179 	    !(ext_filter_mask & RTEXT_FILTER_VF))
1180 		return 0;
1181 
1182 	err = rtnl_port_self_fill(skb, dev);
1183 	if (err)
1184 		return err;
1185 
1186 	if (dev_num_vf(dev->dev.parent)) {
1187 		err = rtnl_vf_ports_fill(skb, dev);
1188 		if (err)
1189 			return err;
1190 	}
1191 
1192 	return 0;
1193 }
1194 
rtnl_phys_port_id_fill(struct sk_buff * skb,struct net_device * dev)1195 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1196 {
1197 	int err;
1198 	struct netdev_phys_item_id ppid;
1199 
1200 	err = dev_get_phys_port_id(dev, &ppid);
1201 	if (err) {
1202 		if (err == -EOPNOTSUPP)
1203 			return 0;
1204 		return err;
1205 	}
1206 
1207 	if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1208 		return -EMSGSIZE;
1209 
1210 	return 0;
1211 }
1212 
rtnl_phys_port_name_fill(struct sk_buff * skb,struct net_device * dev)1213 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1214 {
1215 	char name[IFNAMSIZ];
1216 	int err;
1217 
1218 	err = dev_get_phys_port_name(dev, name, sizeof(name));
1219 	if (err) {
1220 		if (err == -EOPNOTSUPP)
1221 			return 0;
1222 		return err;
1223 	}
1224 
1225 	if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1226 		return -EMSGSIZE;
1227 
1228 	return 0;
1229 }
1230 
rtnl_phys_switch_id_fill(struct sk_buff * skb,struct net_device * dev)1231 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1232 {
1233 	struct netdev_phys_item_id ppid = { };
1234 	int err;
1235 
1236 	err = dev_get_port_parent_id(dev, &ppid, false);
1237 	if (err) {
1238 		if (err == -EOPNOTSUPP)
1239 			return 0;
1240 		return err;
1241 	}
1242 
1243 	if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
1244 		return -EMSGSIZE;
1245 
1246 	return 0;
1247 }
1248 
rtnl_fill_stats(struct sk_buff * skb,struct net_device * dev)1249 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1250 					      struct net_device *dev)
1251 {
1252 	struct rtnl_link_stats64 *sp;
1253 	struct nlattr *attr;
1254 
1255 	attr = nla_reserve_64bit(skb, IFLA_STATS64,
1256 				 sizeof(struct rtnl_link_stats64), IFLA_PAD);
1257 	if (!attr)
1258 		return -EMSGSIZE;
1259 
1260 	sp = nla_data(attr);
1261 	dev_get_stats(dev, sp);
1262 
1263 	attr = nla_reserve(skb, IFLA_STATS,
1264 			   sizeof(struct rtnl_link_stats));
1265 	if (!attr)
1266 		return -EMSGSIZE;
1267 
1268 	copy_rtnl_link_stats(nla_data(attr), sp);
1269 
1270 	return 0;
1271 }
1272 
rtnl_fill_vfinfo(struct sk_buff * skb,struct net_device * dev,int vfs_num,u32 ext_filter_mask)1273 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1274 					       struct net_device *dev,
1275 					       int vfs_num,
1276 					       u32 ext_filter_mask)
1277 {
1278 	struct ifla_vf_rss_query_en vf_rss_query_en;
1279 	struct nlattr *vf, *vfstats, *vfvlanlist;
1280 	struct ifla_vf_link_state vf_linkstate;
1281 	struct ifla_vf_vlan_info vf_vlan_info;
1282 	struct ifla_vf_spoofchk vf_spoofchk;
1283 	struct ifla_vf_tx_rate vf_tx_rate;
1284 	struct ifla_vf_stats vf_stats;
1285 	struct ifla_vf_trust vf_trust;
1286 	struct ifla_vf_vlan vf_vlan;
1287 	struct ifla_vf_rate vf_rate;
1288 	struct ifla_vf_mac vf_mac;
1289 	struct ifla_vf_broadcast vf_broadcast;
1290 	struct ifla_vf_info ivi;
1291 	struct ifla_vf_guid node_guid;
1292 	struct ifla_vf_guid port_guid;
1293 
1294 	memset(&ivi, 0, sizeof(ivi));
1295 
1296 	/* Not all SR-IOV capable drivers support the
1297 	 * spoofcheck and "RSS query enable" query.  Preset to
1298 	 * -1 so the user space tool can detect that the driver
1299 	 * didn't report anything.
1300 	 */
1301 	ivi.spoofchk = -1;
1302 	ivi.rss_query_en = -1;
1303 	ivi.trusted = -1;
1304 	/* The default value for VF link state is "auto"
1305 	 * IFLA_VF_LINK_STATE_AUTO which equals zero
1306 	 */
1307 	ivi.linkstate = 0;
1308 	/* VLAN Protocol by default is 802.1Q */
1309 	ivi.vlan_proto = htons(ETH_P_8021Q);
1310 	if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1311 		return 0;
1312 
1313 	memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1314 	memset(&node_guid, 0, sizeof(node_guid));
1315 	memset(&port_guid, 0, sizeof(port_guid));
1316 
1317 	vf_mac.vf =
1318 		vf_vlan.vf =
1319 		vf_vlan_info.vf =
1320 		vf_rate.vf =
1321 		vf_tx_rate.vf =
1322 		vf_spoofchk.vf =
1323 		vf_linkstate.vf =
1324 		vf_rss_query_en.vf =
1325 		vf_trust.vf =
1326 		node_guid.vf =
1327 		port_guid.vf = ivi.vf;
1328 
1329 	memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1330 	memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
1331 	vf_vlan.vlan = ivi.vlan;
1332 	vf_vlan.qos = ivi.qos;
1333 	vf_vlan_info.vlan = ivi.vlan;
1334 	vf_vlan_info.qos = ivi.qos;
1335 	vf_vlan_info.vlan_proto = ivi.vlan_proto;
1336 	vf_tx_rate.rate = ivi.max_tx_rate;
1337 	vf_rate.min_tx_rate = ivi.min_tx_rate;
1338 	vf_rate.max_tx_rate = ivi.max_tx_rate;
1339 	vf_spoofchk.setting = ivi.spoofchk;
1340 	vf_linkstate.link_state = ivi.linkstate;
1341 	vf_rss_query_en.setting = ivi.rss_query_en;
1342 	vf_trust.setting = ivi.trusted;
1343 	vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1344 	if (!vf)
1345 		return -EMSGSIZE;
1346 	if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1347 	    nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
1348 	    nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1349 	    nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1350 		    &vf_rate) ||
1351 	    nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1352 		    &vf_tx_rate) ||
1353 	    nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1354 		    &vf_spoofchk) ||
1355 	    nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1356 		    &vf_linkstate) ||
1357 	    nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1358 		    sizeof(vf_rss_query_en),
1359 		    &vf_rss_query_en) ||
1360 	    nla_put(skb, IFLA_VF_TRUST,
1361 		    sizeof(vf_trust), &vf_trust))
1362 		goto nla_put_vf_failure;
1363 
1364 	if (dev->netdev_ops->ndo_get_vf_guid &&
1365 	    !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
1366 					      &port_guid)) {
1367 		if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
1368 			    &node_guid) ||
1369 		    nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
1370 			    &port_guid))
1371 			goto nla_put_vf_failure;
1372 	}
1373 	vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1374 	if (!vfvlanlist)
1375 		goto nla_put_vf_failure;
1376 	if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1377 		    &vf_vlan_info)) {
1378 		nla_nest_cancel(skb, vfvlanlist);
1379 		goto nla_put_vf_failure;
1380 	}
1381 	nla_nest_end(skb, vfvlanlist);
1382 	if (~ext_filter_mask & RTEXT_FILTER_SKIP_STATS) {
1383 		memset(&vf_stats, 0, sizeof(vf_stats));
1384 		if (dev->netdev_ops->ndo_get_vf_stats)
1385 			dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1386 							  &vf_stats);
1387 		vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1388 		if (!vfstats)
1389 			goto nla_put_vf_failure;
1390 		if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1391 				      vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1392 		    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1393 				      vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1394 		    nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1395 				      vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1396 		    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1397 				      vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1398 		    nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1399 				      vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1400 		    nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1401 				      vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1402 		    nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1403 				      vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1404 		    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1405 				      vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1406 			nla_nest_cancel(skb, vfstats);
1407 			goto nla_put_vf_failure;
1408 		}
1409 		nla_nest_end(skb, vfstats);
1410 	}
1411 	nla_nest_end(skb, vf);
1412 	return 0;
1413 
1414 nla_put_vf_failure:
1415 	nla_nest_cancel(skb, vf);
1416 	return -EMSGSIZE;
1417 }
1418 
rtnl_fill_vf(struct sk_buff * skb,struct net_device * dev,u32 ext_filter_mask)1419 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1420 					   struct net_device *dev,
1421 					   u32 ext_filter_mask)
1422 {
1423 	struct nlattr *vfinfo;
1424 	int i, num_vfs;
1425 
1426 	if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1427 		return 0;
1428 
1429 	num_vfs = dev_num_vf(dev->dev.parent);
1430 	if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1431 		return -EMSGSIZE;
1432 
1433 	if (!dev->netdev_ops->ndo_get_vf_config)
1434 		return 0;
1435 
1436 	vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1437 	if (!vfinfo)
1438 		return -EMSGSIZE;
1439 
1440 	for (i = 0; i < num_vfs; i++) {
1441 		if (rtnl_fill_vfinfo(skb, dev, i, ext_filter_mask)) {
1442 			nla_nest_cancel(skb, vfinfo);
1443 			return -EMSGSIZE;
1444 		}
1445 	}
1446 
1447 	nla_nest_end(skb, vfinfo);
1448 	return 0;
1449 }
1450 
rtnl_fill_link_ifmap(struct sk_buff * skb,struct net_device * dev)1451 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1452 {
1453 	struct rtnl_link_ifmap map;
1454 
1455 	memset(&map, 0, sizeof(map));
1456 	map.mem_start   = dev->mem_start;
1457 	map.mem_end     = dev->mem_end;
1458 	map.base_addr   = dev->base_addr;
1459 	map.irq         = dev->irq;
1460 	map.dma         = dev->dma;
1461 	map.port        = dev->if_port;
1462 
1463 	if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1464 		return -EMSGSIZE;
1465 
1466 	return 0;
1467 }
1468 
rtnl_xdp_prog_skb(struct net_device * dev)1469 static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1470 {
1471 	const struct bpf_prog *generic_xdp_prog;
1472 
1473 	ASSERT_RTNL();
1474 
1475 	generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1476 	if (!generic_xdp_prog)
1477 		return 0;
1478 	return generic_xdp_prog->aux->id;
1479 }
1480 
rtnl_xdp_prog_drv(struct net_device * dev)1481 static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1482 {
1483 	return dev_xdp_prog_id(dev, XDP_MODE_DRV);
1484 }
1485 
rtnl_xdp_prog_hw(struct net_device * dev)1486 static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1487 {
1488 	return dev_xdp_prog_id(dev, XDP_MODE_HW);
1489 }
1490 
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))1491 static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1492 			       u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1493 			       u32 (*get_prog_id)(struct net_device *dev))
1494 {
1495 	u32 curr_id;
1496 	int err;
1497 
1498 	curr_id = get_prog_id(dev);
1499 	if (!curr_id)
1500 		return 0;
1501 
1502 	*prog_id = curr_id;
1503 	err = nla_put_u32(skb, attr, curr_id);
1504 	if (err)
1505 		return err;
1506 
1507 	if (*mode != XDP_ATTACHED_NONE)
1508 		*mode = XDP_ATTACHED_MULTI;
1509 	else
1510 		*mode = tgt_mode;
1511 
1512 	return 0;
1513 }
1514 
rtnl_xdp_fill(struct sk_buff * skb,struct net_device * dev)1515 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1516 {
1517 	struct nlattr *xdp;
1518 	u32 prog_id;
1519 	int err;
1520 	u8 mode;
1521 
1522 	xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1523 	if (!xdp)
1524 		return -EMSGSIZE;
1525 
1526 	prog_id = 0;
1527 	mode = XDP_ATTACHED_NONE;
1528 	err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1529 				  IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1530 	if (err)
1531 		goto err_cancel;
1532 	err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1533 				  IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1534 	if (err)
1535 		goto err_cancel;
1536 	err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1537 				  IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1538 	if (err)
1539 		goto err_cancel;
1540 
1541 	err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1542 	if (err)
1543 		goto err_cancel;
1544 
1545 	if (prog_id && mode != XDP_ATTACHED_MULTI) {
1546 		err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1547 		if (err)
1548 			goto err_cancel;
1549 	}
1550 
1551 	nla_nest_end(skb, xdp);
1552 	return 0;
1553 
1554 err_cancel:
1555 	nla_nest_cancel(skb, xdp);
1556 	return err;
1557 }
1558 
rtnl_get_event(unsigned long event)1559 static u32 rtnl_get_event(unsigned long event)
1560 {
1561 	u32 rtnl_event_type = IFLA_EVENT_NONE;
1562 
1563 	switch (event) {
1564 	case NETDEV_REBOOT:
1565 		rtnl_event_type = IFLA_EVENT_REBOOT;
1566 		break;
1567 	case NETDEV_FEAT_CHANGE:
1568 		rtnl_event_type = IFLA_EVENT_FEATURES;
1569 		break;
1570 	case NETDEV_BONDING_FAILOVER:
1571 		rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1572 		break;
1573 	case NETDEV_NOTIFY_PEERS:
1574 		rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1575 		break;
1576 	case NETDEV_RESEND_IGMP:
1577 		rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1578 		break;
1579 	case NETDEV_CHANGEINFODATA:
1580 		rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1581 		break;
1582 	default:
1583 		break;
1584 	}
1585 
1586 	return rtnl_event_type;
1587 }
1588 
put_master_ifindex(struct sk_buff * skb,struct net_device * dev)1589 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1590 {
1591 	const struct net_device *upper_dev;
1592 	int ret = 0;
1593 
1594 	rcu_read_lock();
1595 
1596 	upper_dev = netdev_master_upper_dev_get_rcu(dev);
1597 	if (upper_dev)
1598 		ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1599 
1600 	rcu_read_unlock();
1601 	return ret;
1602 }
1603 
nla_put_iflink(struct sk_buff * skb,const struct net_device * dev,bool force)1604 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1605 			  bool force)
1606 {
1607 	int ifindex = dev_get_iflink(dev);
1608 
1609 	if (force || dev->ifindex != ifindex)
1610 		return nla_put_u32(skb, IFLA_LINK, ifindex);
1611 
1612 	return 0;
1613 }
1614 
nla_put_ifalias(struct sk_buff * skb,struct net_device * dev)1615 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1616 					      struct net_device *dev)
1617 {
1618 	char buf[IFALIASZ];
1619 	int ret;
1620 
1621 	ret = dev_get_alias(dev, buf, sizeof(buf));
1622 	return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1623 }
1624 
rtnl_fill_link_netnsid(struct sk_buff * skb,const struct net_device * dev,struct net * src_net,gfp_t gfp)1625 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1626 				  const struct net_device *dev,
1627 				  struct net *src_net, gfp_t gfp)
1628 {
1629 	bool put_iflink = false;
1630 
1631 	if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1632 		struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1633 
1634 		if (!net_eq(dev_net(dev), link_net)) {
1635 			int id = peernet2id_alloc(src_net, link_net, gfp);
1636 
1637 			if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1638 				return -EMSGSIZE;
1639 
1640 			put_iflink = true;
1641 		}
1642 	}
1643 
1644 	return nla_put_iflink(skb, dev, put_iflink);
1645 }
1646 
rtnl_fill_link_af(struct sk_buff * skb,const struct net_device * dev,u32 ext_filter_mask)1647 static int rtnl_fill_link_af(struct sk_buff *skb,
1648 			     const struct net_device *dev,
1649 			     u32 ext_filter_mask)
1650 {
1651 	const struct rtnl_af_ops *af_ops;
1652 	struct nlattr *af_spec;
1653 
1654 	af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1655 	if (!af_spec)
1656 		return -EMSGSIZE;
1657 
1658 	list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1659 		struct nlattr *af;
1660 		int err;
1661 
1662 		if (!af_ops->fill_link_af)
1663 			continue;
1664 
1665 		af = nla_nest_start_noflag(skb, af_ops->family);
1666 		if (!af)
1667 			return -EMSGSIZE;
1668 
1669 		err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1670 		/*
1671 		 * Caller may return ENODATA to indicate that there
1672 		 * was no data to be dumped. This is not an error, it
1673 		 * means we should trim the attribute header and
1674 		 * continue.
1675 		 */
1676 		if (err == -ENODATA)
1677 			nla_nest_cancel(skb, af);
1678 		else if (err < 0)
1679 			return -EMSGSIZE;
1680 
1681 		nla_nest_end(skb, af);
1682 	}
1683 
1684 	nla_nest_end(skb, af_spec);
1685 	return 0;
1686 }
1687 
rtnl_fill_alt_ifnames(struct sk_buff * skb,const struct net_device * dev)1688 static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
1689 				 const struct net_device *dev)
1690 {
1691 	struct netdev_name_node *name_node;
1692 	int count = 0;
1693 
1694 	list_for_each_entry(name_node, &dev->name_node->list, list) {
1695 		if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
1696 			return -EMSGSIZE;
1697 		count++;
1698 	}
1699 	return count;
1700 }
1701 
rtnl_fill_prop_list(struct sk_buff * skb,const struct net_device * dev)1702 static int rtnl_fill_prop_list(struct sk_buff *skb,
1703 			       const struct net_device *dev)
1704 {
1705 	struct nlattr *prop_list;
1706 	int ret;
1707 
1708 	prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
1709 	if (!prop_list)
1710 		return -EMSGSIZE;
1711 
1712 	ret = rtnl_fill_alt_ifnames(skb, dev);
1713 	if (ret <= 0)
1714 		goto nest_cancel;
1715 
1716 	nla_nest_end(skb, prop_list);
1717 	return 0;
1718 
1719 nest_cancel:
1720 	nla_nest_cancel(skb, prop_list);
1721 	return ret;
1722 }
1723 
rtnl_fill_proto_down(struct sk_buff * skb,const struct net_device * dev)1724 static int rtnl_fill_proto_down(struct sk_buff *skb,
1725 				const struct net_device *dev)
1726 {
1727 	struct nlattr *pr;
1728 	u32 preason;
1729 
1730 	if (nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1731 		goto nla_put_failure;
1732 
1733 	preason = dev->proto_down_reason;
1734 	if (!preason)
1735 		return 0;
1736 
1737 	pr = nla_nest_start(skb, IFLA_PROTO_DOWN_REASON);
1738 	if (!pr)
1739 		return -EMSGSIZE;
1740 
1741 	if (nla_put_u32(skb, IFLA_PROTO_DOWN_REASON_VALUE, preason)) {
1742 		nla_nest_cancel(skb, pr);
1743 		goto nla_put_failure;
1744 	}
1745 
1746 	nla_nest_end(skb, pr);
1747 	return 0;
1748 
1749 nla_put_failure:
1750 	return -EMSGSIZE;
1751 }
1752 
rtnl_fill_devlink_port(struct sk_buff * skb,const struct net_device * dev)1753 static int rtnl_fill_devlink_port(struct sk_buff *skb,
1754 				  const struct net_device *dev)
1755 {
1756 	struct nlattr *devlink_port_nest;
1757 	int ret;
1758 
1759 	devlink_port_nest = nla_nest_start(skb, IFLA_DEVLINK_PORT);
1760 	if (!devlink_port_nest)
1761 		return -EMSGSIZE;
1762 
1763 	if (dev->devlink_port) {
1764 		ret = devlink_nl_port_handle_fill(skb, dev->devlink_port);
1765 		if (ret < 0)
1766 			goto nest_cancel;
1767 	}
1768 
1769 	nla_nest_end(skb, devlink_port_nest);
1770 	return 0;
1771 
1772 nest_cancel:
1773 	nla_nest_cancel(skb, devlink_port_nest);
1774 	return ret;
1775 }
1776 
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)1777 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1778 			    struct net_device *dev, struct net *src_net,
1779 			    int type, u32 pid, u32 seq, u32 change,
1780 			    unsigned int flags, u32 ext_filter_mask,
1781 			    u32 event, int *new_nsid, int new_ifindex,
1782 			    int tgt_netnsid, gfp_t gfp)
1783 {
1784 	struct ifinfomsg *ifm;
1785 	struct nlmsghdr *nlh;
1786 	struct Qdisc *qdisc;
1787 
1788 	ASSERT_RTNL();
1789 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1790 	if (nlh == NULL)
1791 		return -EMSGSIZE;
1792 
1793 	ifm = nlmsg_data(nlh);
1794 	ifm->ifi_family = AF_UNSPEC;
1795 	ifm->__ifi_pad = 0;
1796 	ifm->ifi_type = dev->type;
1797 	ifm->ifi_index = dev->ifindex;
1798 	ifm->ifi_flags = dev_get_flags(dev);
1799 	ifm->ifi_change = change;
1800 
1801 	if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1802 		goto nla_put_failure;
1803 
1804 	qdisc = rtnl_dereference(dev->qdisc);
1805 	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1806 	    nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1807 	    nla_put_u8(skb, IFLA_OPERSTATE,
1808 		       netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1809 	    nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1810 	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1811 	    nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1812 	    nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1813 	    nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1814 	    nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1815 	    nla_put_u32(skb, IFLA_ALLMULTI, dev->allmulti) ||
1816 	    nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1817 	    nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1818 	    nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1819 	    nla_put_u32(skb, IFLA_GRO_MAX_SIZE, dev->gro_max_size) ||
1820 	    nla_put_u32(skb, IFLA_GSO_IPV4_MAX_SIZE, dev->gso_ipv4_max_size) ||
1821 	    nla_put_u32(skb, IFLA_GRO_IPV4_MAX_SIZE, dev->gro_ipv4_max_size) ||
1822 	    nla_put_u32(skb, IFLA_TSO_MAX_SIZE, dev->tso_max_size) ||
1823 	    nla_put_u32(skb, IFLA_TSO_MAX_SEGS, dev->tso_max_segs) ||
1824 #ifdef CONFIG_RPS
1825 	    nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1826 #endif
1827 	    put_master_ifindex(skb, dev) ||
1828 	    nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1829 	    (qdisc &&
1830 	     nla_put_string(skb, IFLA_QDISC, qdisc->ops->id)) ||
1831 	    nla_put_ifalias(skb, dev) ||
1832 	    nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1833 			atomic_read(&dev->carrier_up_count) +
1834 			atomic_read(&dev->carrier_down_count)) ||
1835 	    nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1836 			atomic_read(&dev->carrier_up_count)) ||
1837 	    nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1838 			atomic_read(&dev->carrier_down_count)))
1839 		goto nla_put_failure;
1840 
1841 	if (rtnl_fill_proto_down(skb, dev))
1842 		goto nla_put_failure;
1843 
1844 	if (event != IFLA_EVENT_NONE) {
1845 		if (nla_put_u32(skb, IFLA_EVENT, event))
1846 			goto nla_put_failure;
1847 	}
1848 
1849 	if (rtnl_fill_link_ifmap(skb, dev))
1850 		goto nla_put_failure;
1851 
1852 	if (dev->addr_len) {
1853 		if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1854 		    nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1855 			goto nla_put_failure;
1856 	}
1857 
1858 	if (rtnl_phys_port_id_fill(skb, dev))
1859 		goto nla_put_failure;
1860 
1861 	if (rtnl_phys_port_name_fill(skb, dev))
1862 		goto nla_put_failure;
1863 
1864 	if (rtnl_phys_switch_id_fill(skb, dev))
1865 		goto nla_put_failure;
1866 
1867 	if (rtnl_fill_stats(skb, dev))
1868 		goto nla_put_failure;
1869 
1870 	if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1871 		goto nla_put_failure;
1872 
1873 	if (rtnl_port_fill(skb, dev, ext_filter_mask))
1874 		goto nla_put_failure;
1875 
1876 	if (rtnl_xdp_fill(skb, dev))
1877 		goto nla_put_failure;
1878 
1879 	if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1880 		if (rtnl_link_fill(skb, dev) < 0)
1881 			goto nla_put_failure;
1882 	}
1883 
1884 	if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1885 		goto nla_put_failure;
1886 
1887 	if (new_nsid &&
1888 	    nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1889 		goto nla_put_failure;
1890 	if (new_ifindex &&
1891 	    nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1892 		goto nla_put_failure;
1893 
1894 	if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
1895 	    nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
1896 		goto nla_put_failure;
1897 
1898 	rcu_read_lock();
1899 	if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1900 		goto nla_put_failure_rcu;
1901 	rcu_read_unlock();
1902 
1903 	if (rtnl_fill_prop_list(skb, dev))
1904 		goto nla_put_failure;
1905 
1906 	if (dev->dev.parent &&
1907 	    nla_put_string(skb, IFLA_PARENT_DEV_NAME,
1908 			   dev_name(dev->dev.parent)))
1909 		goto nla_put_failure;
1910 
1911 	if (dev->dev.parent && dev->dev.parent->bus &&
1912 	    nla_put_string(skb, IFLA_PARENT_DEV_BUS_NAME,
1913 			   dev->dev.parent->bus->name))
1914 		goto nla_put_failure;
1915 
1916 	if (rtnl_fill_devlink_port(skb, dev))
1917 		goto nla_put_failure;
1918 
1919 	nlmsg_end(skb, nlh);
1920 	return 0;
1921 
1922 nla_put_failure_rcu:
1923 	rcu_read_unlock();
1924 nla_put_failure:
1925 	nlmsg_cancel(skb, nlh);
1926 	return -EMSGSIZE;
1927 }
1928 
1929 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1930 	[IFLA_IFNAME]		= { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1931 	[IFLA_ADDRESS]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1932 	[IFLA_BROADCAST]	= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1933 	[IFLA_MAP]		= { .len = sizeof(struct rtnl_link_ifmap) },
1934 	[IFLA_MTU]		= { .type = NLA_U32 },
1935 	[IFLA_LINK]		= { .type = NLA_U32 },
1936 	[IFLA_MASTER]		= { .type = NLA_U32 },
1937 	[IFLA_CARRIER]		= { .type = NLA_U8 },
1938 	[IFLA_TXQLEN]		= { .type = NLA_U32 },
1939 	[IFLA_WEIGHT]		= { .type = NLA_U32 },
1940 	[IFLA_OPERSTATE]	= { .type = NLA_U8 },
1941 	[IFLA_LINKMODE]		= { .type = NLA_U8 },
1942 	[IFLA_LINKINFO]		= { .type = NLA_NESTED },
1943 	[IFLA_NET_NS_PID]	= { .type = NLA_U32 },
1944 	[IFLA_NET_NS_FD]	= { .type = NLA_U32 },
1945 	/* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1946 	 * allow 0-length string (needed to remove an alias).
1947 	 */
1948 	[IFLA_IFALIAS]	        = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1949 	[IFLA_VFINFO_LIST]	= {. type = NLA_NESTED },
1950 	[IFLA_VF_PORTS]		= { .type = NLA_NESTED },
1951 	[IFLA_PORT_SELF]	= { .type = NLA_NESTED },
1952 	[IFLA_AF_SPEC]		= { .type = NLA_NESTED },
1953 	[IFLA_EXT_MASK]		= { .type = NLA_U32 },
1954 	[IFLA_PROMISCUITY]	= { .type = NLA_U32 },
1955 	[IFLA_NUM_TX_QUEUES]	= { .type = NLA_U32 },
1956 	[IFLA_NUM_RX_QUEUES]	= { .type = NLA_U32 },
1957 	[IFLA_GSO_MAX_SEGS]	= { .type = NLA_U32 },
1958 	[IFLA_GSO_MAX_SIZE]	= { .type = NLA_U32 },
1959 	[IFLA_PHYS_PORT_ID]	= { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1960 	[IFLA_CARRIER_CHANGES]	= { .type = NLA_U32 },  /* ignored */
1961 	[IFLA_PHYS_SWITCH_ID]	= { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1962 	[IFLA_LINK_NETNSID]	= { .type = NLA_S32 },
1963 	[IFLA_PROTO_DOWN]	= { .type = NLA_U8 },
1964 	[IFLA_XDP]		= { .type = NLA_NESTED },
1965 	[IFLA_EVENT]		= { .type = NLA_U32 },
1966 	[IFLA_GROUP]		= { .type = NLA_U32 },
1967 	[IFLA_TARGET_NETNSID]	= { .type = NLA_S32 },
1968 	[IFLA_CARRIER_UP_COUNT]	= { .type = NLA_U32 },
1969 	[IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1970 	[IFLA_MIN_MTU]		= { .type = NLA_U32 },
1971 	[IFLA_MAX_MTU]		= { .type = NLA_U32 },
1972 	[IFLA_PROP_LIST]	= { .type = NLA_NESTED },
1973 	[IFLA_ALT_IFNAME]	= { .type = NLA_STRING,
1974 				    .len = ALTIFNAMSIZ - 1 },
1975 	[IFLA_PERM_ADDRESS]	= { .type = NLA_REJECT },
1976 	[IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED },
1977 	[IFLA_NEW_IFINDEX]	= NLA_POLICY_MIN(NLA_S32, 1),
1978 	[IFLA_PARENT_DEV_NAME]	= { .type = NLA_NUL_STRING },
1979 	[IFLA_GRO_MAX_SIZE]	= { .type = NLA_U32 },
1980 	[IFLA_TSO_MAX_SIZE]	= { .type = NLA_REJECT },
1981 	[IFLA_TSO_MAX_SEGS]	= { .type = NLA_REJECT },
1982 	[IFLA_ALLMULTI]		= { .type = NLA_REJECT },
1983 	[IFLA_GSO_IPV4_MAX_SIZE]	= { .type = NLA_U32 },
1984 	[IFLA_GRO_IPV4_MAX_SIZE]	= { .type = NLA_U32 },
1985 };
1986 
1987 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1988 	[IFLA_INFO_KIND]	= { .type = NLA_STRING },
1989 	[IFLA_INFO_DATA]	= { .type = NLA_NESTED },
1990 	[IFLA_INFO_SLAVE_KIND]	= { .type = NLA_STRING },
1991 	[IFLA_INFO_SLAVE_DATA]	= { .type = NLA_NESTED },
1992 };
1993 
1994 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1995 	[IFLA_VF_MAC]		= { .len = sizeof(struct ifla_vf_mac) },
1996 	[IFLA_VF_BROADCAST]	= { .type = NLA_REJECT },
1997 	[IFLA_VF_VLAN]		= { .len = sizeof(struct ifla_vf_vlan) },
1998 	[IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1999 	[IFLA_VF_TX_RATE]	= { .len = sizeof(struct ifla_vf_tx_rate) },
2000 	[IFLA_VF_SPOOFCHK]	= { .len = sizeof(struct ifla_vf_spoofchk) },
2001 	[IFLA_VF_RATE]		= { .len = sizeof(struct ifla_vf_rate) },
2002 	[IFLA_VF_LINK_STATE]	= { .len = sizeof(struct ifla_vf_link_state) },
2003 	[IFLA_VF_RSS_QUERY_EN]	= { .len = sizeof(struct ifla_vf_rss_query_en) },
2004 	[IFLA_VF_STATS]		= { .type = NLA_NESTED },
2005 	[IFLA_VF_TRUST]		= { .len = sizeof(struct ifla_vf_trust) },
2006 	[IFLA_VF_IB_NODE_GUID]	= { .len = sizeof(struct ifla_vf_guid) },
2007 	[IFLA_VF_IB_PORT_GUID]	= { .len = sizeof(struct ifla_vf_guid) },
2008 };
2009 
2010 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
2011 	[IFLA_PORT_VF]		= { .type = NLA_U32 },
2012 	[IFLA_PORT_PROFILE]	= { .type = NLA_STRING,
2013 				    .len = PORT_PROFILE_MAX },
2014 	[IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
2015 				      .len = PORT_UUID_MAX },
2016 	[IFLA_PORT_HOST_UUID]	= { .type = NLA_STRING,
2017 				    .len = PORT_UUID_MAX },
2018 	[IFLA_PORT_REQUEST]	= { .type = NLA_U8, },
2019 	[IFLA_PORT_RESPONSE]	= { .type = NLA_U16, },
2020 
2021 	/* Unused, but we need to keep it here since user space could
2022 	 * fill it. It's also broken with regard to NLA_BINARY use in
2023 	 * combination with structs.
2024 	 */
2025 	[IFLA_PORT_VSI_TYPE]	= { .type = NLA_BINARY,
2026 				    .len = sizeof(struct ifla_port_vsi) },
2027 };
2028 
2029 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
2030 	[IFLA_XDP_UNSPEC]	= { .strict_start_type = IFLA_XDP_EXPECTED_FD },
2031 	[IFLA_XDP_FD]		= { .type = NLA_S32 },
2032 	[IFLA_XDP_EXPECTED_FD]	= { .type = NLA_S32 },
2033 	[IFLA_XDP_ATTACHED]	= { .type = NLA_U8 },
2034 	[IFLA_XDP_FLAGS]	= { .type = NLA_U32 },
2035 	[IFLA_XDP_PROG_ID]	= { .type = NLA_U32 },
2036 };
2037 
linkinfo_to_kind_ops(const struct nlattr * nla)2038 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
2039 {
2040 	const struct rtnl_link_ops *ops = NULL;
2041 	struct nlattr *linfo[IFLA_INFO_MAX + 1];
2042 
2043 	if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
2044 		return NULL;
2045 
2046 	if (linfo[IFLA_INFO_KIND]) {
2047 		char kind[MODULE_NAME_LEN];
2048 
2049 		nla_strscpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
2050 		ops = rtnl_link_ops_get(kind);
2051 	}
2052 
2053 	return ops;
2054 }
2055 
link_master_filtered(struct net_device * dev,int master_idx)2056 static bool link_master_filtered(struct net_device *dev, int master_idx)
2057 {
2058 	struct net_device *master;
2059 
2060 	if (!master_idx)
2061 		return false;
2062 
2063 	master = netdev_master_upper_dev_get(dev);
2064 
2065 	/* 0 is already used to denote IFLA_MASTER wasn't passed, therefore need
2066 	 * another invalid value for ifindex to denote "no master".
2067 	 */
2068 	if (master_idx == -1)
2069 		return !!master;
2070 
2071 	if (!master || master->ifindex != master_idx)
2072 		return true;
2073 
2074 	return false;
2075 }
2076 
link_kind_filtered(const struct net_device * dev,const struct rtnl_link_ops * kind_ops)2077 static bool link_kind_filtered(const struct net_device *dev,
2078 			       const struct rtnl_link_ops *kind_ops)
2079 {
2080 	if (kind_ops && dev->rtnl_link_ops != kind_ops)
2081 		return true;
2082 
2083 	return false;
2084 }
2085 
link_dump_filtered(struct net_device * dev,int master_idx,const struct rtnl_link_ops * kind_ops)2086 static bool link_dump_filtered(struct net_device *dev,
2087 			       int master_idx,
2088 			       const struct rtnl_link_ops *kind_ops)
2089 {
2090 	if (link_master_filtered(dev, master_idx) ||
2091 	    link_kind_filtered(dev, kind_ops))
2092 		return true;
2093 
2094 	return false;
2095 }
2096 
2097 /**
2098  * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
2099  * @sk: netlink socket
2100  * @netnsid: network namespace identifier
2101  *
2102  * Returns the network namespace identified by netnsid on success or an error
2103  * pointer on failure.
2104  */
rtnl_get_net_ns_capable(struct sock * sk,int netnsid)2105 struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
2106 {
2107 	struct net *net;
2108 
2109 	net = get_net_ns_by_id(sock_net(sk), netnsid);
2110 	if (!net)
2111 		return ERR_PTR(-EINVAL);
2112 
2113 	/* For now, the caller is required to have CAP_NET_ADMIN in
2114 	 * the user namespace owning the target net ns.
2115 	 */
2116 	if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
2117 		put_net(net);
2118 		return ERR_PTR(-EACCES);
2119 	}
2120 	return net;
2121 }
2122 EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
2123 
rtnl_valid_dump_ifinfo_req(const struct nlmsghdr * nlh,bool strict_check,struct nlattr ** tb,struct netlink_ext_ack * extack)2124 static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
2125 				      bool strict_check, struct nlattr **tb,
2126 				      struct netlink_ext_ack *extack)
2127 {
2128 	int hdrlen;
2129 
2130 	if (strict_check) {
2131 		struct ifinfomsg *ifm;
2132 
2133 		if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2134 			NL_SET_ERR_MSG(extack, "Invalid header for link dump");
2135 			return -EINVAL;
2136 		}
2137 
2138 		ifm = nlmsg_data(nlh);
2139 		if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2140 		    ifm->ifi_change) {
2141 			NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
2142 			return -EINVAL;
2143 		}
2144 		if (ifm->ifi_index) {
2145 			NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
2146 			return -EINVAL;
2147 		}
2148 
2149 		return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
2150 						     IFLA_MAX, ifla_policy,
2151 						     extack);
2152 	}
2153 
2154 	/* A hack to preserve kernel<->userspace interface.
2155 	 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
2156 	 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
2157 	 * what iproute2 < v3.9.0 used.
2158 	 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
2159 	 * attribute, its netlink message is shorter than struct ifinfomsg.
2160 	 */
2161 	hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2162 		 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2163 
2164 	return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
2165 				      extack);
2166 }
2167 
rtnl_dump_ifinfo(struct sk_buff * skb,struct netlink_callback * cb)2168 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2169 {
2170 	struct netlink_ext_ack *extack = cb->extack;
2171 	const struct nlmsghdr *nlh = cb->nlh;
2172 	struct net *net = sock_net(skb->sk);
2173 	struct net *tgt_net = net;
2174 	int h, s_h;
2175 	int idx = 0, s_idx;
2176 	struct net_device *dev;
2177 	struct hlist_head *head;
2178 	struct nlattr *tb[IFLA_MAX+1];
2179 	u32 ext_filter_mask = 0;
2180 	const struct rtnl_link_ops *kind_ops = NULL;
2181 	unsigned int flags = NLM_F_MULTI;
2182 	int master_idx = 0;
2183 	int netnsid = -1;
2184 	int err, i;
2185 
2186 	s_h = cb->args[0];
2187 	s_idx = cb->args[1];
2188 
2189 	err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
2190 	if (err < 0) {
2191 		if (cb->strict_check)
2192 			return err;
2193 
2194 		goto walk_entries;
2195 	}
2196 
2197 	for (i = 0; i <= IFLA_MAX; ++i) {
2198 		if (!tb[i])
2199 			continue;
2200 
2201 		/* new attributes should only be added with strict checking */
2202 		switch (i) {
2203 		case IFLA_TARGET_NETNSID:
2204 			netnsid = nla_get_s32(tb[i]);
2205 			tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
2206 			if (IS_ERR(tgt_net)) {
2207 				NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
2208 				return PTR_ERR(tgt_net);
2209 			}
2210 			break;
2211 		case IFLA_EXT_MASK:
2212 			ext_filter_mask = nla_get_u32(tb[i]);
2213 			break;
2214 		case IFLA_MASTER:
2215 			master_idx = nla_get_u32(tb[i]);
2216 			break;
2217 		case IFLA_LINKINFO:
2218 			kind_ops = linkinfo_to_kind_ops(tb[i]);
2219 			break;
2220 		default:
2221 			if (cb->strict_check) {
2222 				NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
2223 				return -EINVAL;
2224 			}
2225 		}
2226 	}
2227 
2228 	if (master_idx || kind_ops)
2229 		flags |= NLM_F_DUMP_FILTERED;
2230 
2231 walk_entries:
2232 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2233 		idx = 0;
2234 		head = &tgt_net->dev_index_head[h];
2235 		hlist_for_each_entry(dev, head, index_hlist) {
2236 			if (link_dump_filtered(dev, master_idx, kind_ops))
2237 				goto cont;
2238 			if (idx < s_idx)
2239 				goto cont;
2240 			err = rtnl_fill_ifinfo(skb, dev, net,
2241 					       RTM_NEWLINK,
2242 					       NETLINK_CB(cb->skb).portid,
2243 					       nlh->nlmsg_seq, 0, flags,
2244 					       ext_filter_mask, 0, NULL, 0,
2245 					       netnsid, GFP_KERNEL);
2246 
2247 			if (err < 0) {
2248 				if (likely(skb->len))
2249 					goto out;
2250 
2251 				goto out_err;
2252 			}
2253 cont:
2254 			idx++;
2255 		}
2256 	}
2257 out:
2258 	err = skb->len;
2259 out_err:
2260 	cb->args[1] = idx;
2261 	cb->args[0] = h;
2262 	cb->seq = tgt_net->dev_base_seq;
2263 	nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2264 	if (netnsid >= 0)
2265 		put_net(tgt_net);
2266 
2267 	return err;
2268 }
2269 
rtnl_nla_parse_ifinfomsg(struct nlattr ** tb,const struct nlattr * nla_peer,struct netlink_ext_ack * exterr)2270 int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer,
2271 			     struct netlink_ext_ack *exterr)
2272 {
2273 	const struct ifinfomsg *ifmp;
2274 	const struct nlattr *attrs;
2275 	size_t len;
2276 
2277 	ifmp = nla_data(nla_peer);
2278 	attrs = nla_data(nla_peer) + sizeof(struct ifinfomsg);
2279 	len = nla_len(nla_peer) - sizeof(struct ifinfomsg);
2280 
2281 	if (ifmp->ifi_index < 0) {
2282 		NL_SET_ERR_MSG_ATTR(exterr, nla_peer,
2283 				    "ifindex can't be negative");
2284 		return -EINVAL;
2285 	}
2286 
2287 	return nla_parse_deprecated(tb, IFLA_MAX, attrs, len, ifla_policy,
2288 				    exterr);
2289 }
2290 EXPORT_SYMBOL(rtnl_nla_parse_ifinfomsg);
2291 
rtnl_link_get_net(struct net * src_net,struct nlattr * tb[])2292 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2293 {
2294 	struct net *net;
2295 	/* Examine the link attributes and figure out which
2296 	 * network namespace we are talking about.
2297 	 */
2298 	if (tb[IFLA_NET_NS_PID])
2299 		net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2300 	else if (tb[IFLA_NET_NS_FD])
2301 		net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2302 	else
2303 		net = get_net(src_net);
2304 	return net;
2305 }
2306 EXPORT_SYMBOL(rtnl_link_get_net);
2307 
2308 /* Figure out which network namespace we are talking about by
2309  * examining the link attributes in the following order:
2310  *
2311  * 1. IFLA_NET_NS_PID
2312  * 2. IFLA_NET_NS_FD
2313  * 3. IFLA_TARGET_NETNSID
2314  */
rtnl_link_get_net_by_nlattr(struct net * src_net,struct nlattr * tb[])2315 static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2316 					       struct nlattr *tb[])
2317 {
2318 	struct net *net;
2319 
2320 	if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2321 		return rtnl_link_get_net(src_net, tb);
2322 
2323 	if (!tb[IFLA_TARGET_NETNSID])
2324 		return get_net(src_net);
2325 
2326 	net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2327 	if (!net)
2328 		return ERR_PTR(-EINVAL);
2329 
2330 	return net;
2331 }
2332 
rtnl_link_get_net_capable(const struct sk_buff * skb,struct net * src_net,struct nlattr * tb[],int cap)2333 static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2334 					     struct net *src_net,
2335 					     struct nlattr *tb[], int cap)
2336 {
2337 	struct net *net;
2338 
2339 	net = rtnl_link_get_net_by_nlattr(src_net, tb);
2340 	if (IS_ERR(net))
2341 		return net;
2342 
2343 	if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2344 		put_net(net);
2345 		return ERR_PTR(-EPERM);
2346 	}
2347 
2348 	return net;
2349 }
2350 
2351 /* Verify that rtnetlink requests do not pass additional properties
2352  * potentially referring to different network namespaces.
2353  */
rtnl_ensure_unique_netns(struct nlattr * tb[],struct netlink_ext_ack * extack,bool netns_id_only)2354 static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2355 				    struct netlink_ext_ack *extack,
2356 				    bool netns_id_only)
2357 {
2358 
2359 	if (netns_id_only) {
2360 		if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2361 			return 0;
2362 
2363 		NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2364 		return -EOPNOTSUPP;
2365 	}
2366 
2367 	if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2368 		goto invalid_attr;
2369 
2370 	if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2371 		goto invalid_attr;
2372 
2373 	if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2374 		goto invalid_attr;
2375 
2376 	return 0;
2377 
2378 invalid_attr:
2379 	NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2380 	return -EINVAL;
2381 }
2382 
rtnl_set_vf_rate(struct net_device * dev,int vf,int min_tx_rate,int max_tx_rate)2383 static	int rtnl_set_vf_rate(struct net_device *dev, int vf, int min_tx_rate,
2384 			     int max_tx_rate)
2385 {
2386 	const struct net_device_ops *ops = dev->netdev_ops;
2387 
2388 	if (!ops->ndo_set_vf_rate)
2389 		return -EOPNOTSUPP;
2390 	if (max_tx_rate && max_tx_rate < min_tx_rate)
2391 		return -EINVAL;
2392 
2393 	return ops->ndo_set_vf_rate(dev, vf, min_tx_rate, max_tx_rate);
2394 }
2395 
validate_linkmsg(struct net_device * dev,struct nlattr * tb[],struct netlink_ext_ack * extack)2396 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[],
2397 			    struct netlink_ext_ack *extack)
2398 {
2399 	if (tb[IFLA_ADDRESS] &&
2400 	    nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2401 		return -EINVAL;
2402 
2403 	if (tb[IFLA_BROADCAST] &&
2404 	    nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2405 		return -EINVAL;
2406 
2407 	if (tb[IFLA_GSO_MAX_SIZE] &&
2408 	    nla_get_u32(tb[IFLA_GSO_MAX_SIZE]) > dev->tso_max_size) {
2409 		NL_SET_ERR_MSG(extack, "too big gso_max_size");
2410 		return -EINVAL;
2411 	}
2412 
2413 	if (tb[IFLA_GSO_MAX_SEGS] &&
2414 	    (nla_get_u32(tb[IFLA_GSO_MAX_SEGS]) > GSO_MAX_SEGS ||
2415 	     nla_get_u32(tb[IFLA_GSO_MAX_SEGS]) > dev->tso_max_segs)) {
2416 		NL_SET_ERR_MSG(extack, "too big gso_max_segs");
2417 		return -EINVAL;
2418 	}
2419 
2420 	if (tb[IFLA_GRO_MAX_SIZE] &&
2421 	    nla_get_u32(tb[IFLA_GRO_MAX_SIZE]) > GRO_MAX_SIZE) {
2422 		NL_SET_ERR_MSG(extack, "too big gro_max_size");
2423 		return -EINVAL;
2424 	}
2425 
2426 	if (tb[IFLA_GSO_IPV4_MAX_SIZE] &&
2427 	    nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE]) > dev->tso_max_size) {
2428 		NL_SET_ERR_MSG(extack, "too big gso_ipv4_max_size");
2429 		return -EINVAL;
2430 	}
2431 
2432 	if (tb[IFLA_GRO_IPV4_MAX_SIZE] &&
2433 	    nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE]) > GRO_MAX_SIZE) {
2434 		NL_SET_ERR_MSG(extack, "too big gro_ipv4_max_size");
2435 		return -EINVAL;
2436 	}
2437 
2438 	if (tb[IFLA_AF_SPEC]) {
2439 		struct nlattr *af;
2440 		int rem, err;
2441 
2442 		nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2443 			const struct rtnl_af_ops *af_ops;
2444 
2445 			af_ops = rtnl_af_lookup(nla_type(af));
2446 			if (!af_ops)
2447 				return -EAFNOSUPPORT;
2448 
2449 			if (!af_ops->set_link_af)
2450 				return -EOPNOTSUPP;
2451 
2452 			if (af_ops->validate_link_af) {
2453 				err = af_ops->validate_link_af(dev, af, extack);
2454 				if (err < 0)
2455 					return err;
2456 			}
2457 		}
2458 	}
2459 
2460 	return 0;
2461 }
2462 
handle_infiniband_guid(struct net_device * dev,struct ifla_vf_guid * ivt,int guid_type)2463 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2464 				  int guid_type)
2465 {
2466 	const struct net_device_ops *ops = dev->netdev_ops;
2467 
2468 	return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2469 }
2470 
handle_vf_guid(struct net_device * dev,struct ifla_vf_guid * ivt,int guid_type)2471 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2472 {
2473 	if (dev->type != ARPHRD_INFINIBAND)
2474 		return -EOPNOTSUPP;
2475 
2476 	return handle_infiniband_guid(dev, ivt, guid_type);
2477 }
2478 
do_setvfinfo(struct net_device * dev,struct nlattr ** tb)2479 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2480 {
2481 	const struct net_device_ops *ops = dev->netdev_ops;
2482 	int err = -EINVAL;
2483 
2484 	if (tb[IFLA_VF_MAC]) {
2485 		struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2486 
2487 		if (ivm->vf >= INT_MAX)
2488 			return -EINVAL;
2489 		err = -EOPNOTSUPP;
2490 		if (ops->ndo_set_vf_mac)
2491 			err = ops->ndo_set_vf_mac(dev, ivm->vf,
2492 						  ivm->mac);
2493 		if (err < 0)
2494 			return err;
2495 	}
2496 
2497 	if (tb[IFLA_VF_VLAN]) {
2498 		struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2499 
2500 		if (ivv->vf >= INT_MAX)
2501 			return -EINVAL;
2502 		err = -EOPNOTSUPP;
2503 		if (ops->ndo_set_vf_vlan)
2504 			err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2505 						   ivv->qos,
2506 						   htons(ETH_P_8021Q));
2507 		if (err < 0)
2508 			return err;
2509 	}
2510 
2511 	if (tb[IFLA_VF_VLAN_LIST]) {
2512 		struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2513 		struct nlattr *attr;
2514 		int rem, len = 0;
2515 
2516 		err = -EOPNOTSUPP;
2517 		if (!ops->ndo_set_vf_vlan)
2518 			return err;
2519 
2520 		nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2521 			if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2522 			    nla_len(attr) < NLA_HDRLEN) {
2523 				return -EINVAL;
2524 			}
2525 			if (len >= MAX_VLAN_LIST_LEN)
2526 				return -EOPNOTSUPP;
2527 			ivvl[len] = nla_data(attr);
2528 
2529 			len++;
2530 		}
2531 		if (len == 0)
2532 			return -EINVAL;
2533 
2534 		if (ivvl[0]->vf >= INT_MAX)
2535 			return -EINVAL;
2536 		err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2537 					   ivvl[0]->qos, ivvl[0]->vlan_proto);
2538 		if (err < 0)
2539 			return err;
2540 	}
2541 
2542 	if (tb[IFLA_VF_TX_RATE]) {
2543 		struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2544 		struct ifla_vf_info ivf;
2545 
2546 		if (ivt->vf >= INT_MAX)
2547 			return -EINVAL;
2548 		err = -EOPNOTSUPP;
2549 		if (ops->ndo_get_vf_config)
2550 			err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2551 		if (err < 0)
2552 			return err;
2553 
2554 		err = rtnl_set_vf_rate(dev, ivt->vf,
2555 				       ivf.min_tx_rate, ivt->rate);
2556 		if (err < 0)
2557 			return err;
2558 	}
2559 
2560 	if (tb[IFLA_VF_RATE]) {
2561 		struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2562 
2563 		if (ivt->vf >= INT_MAX)
2564 			return -EINVAL;
2565 
2566 		err = rtnl_set_vf_rate(dev, ivt->vf,
2567 				       ivt->min_tx_rate, ivt->max_tx_rate);
2568 		if (err < 0)
2569 			return err;
2570 	}
2571 
2572 	if (tb[IFLA_VF_SPOOFCHK]) {
2573 		struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2574 
2575 		if (ivs->vf >= INT_MAX)
2576 			return -EINVAL;
2577 		err = -EOPNOTSUPP;
2578 		if (ops->ndo_set_vf_spoofchk)
2579 			err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2580 						       ivs->setting);
2581 		if (err < 0)
2582 			return err;
2583 	}
2584 
2585 	if (tb[IFLA_VF_LINK_STATE]) {
2586 		struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2587 
2588 		if (ivl->vf >= INT_MAX)
2589 			return -EINVAL;
2590 		err = -EOPNOTSUPP;
2591 		if (ops->ndo_set_vf_link_state)
2592 			err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2593 							 ivl->link_state);
2594 		if (err < 0)
2595 			return err;
2596 	}
2597 
2598 	if (tb[IFLA_VF_RSS_QUERY_EN]) {
2599 		struct ifla_vf_rss_query_en *ivrssq_en;
2600 
2601 		err = -EOPNOTSUPP;
2602 		ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2603 		if (ivrssq_en->vf >= INT_MAX)
2604 			return -EINVAL;
2605 		if (ops->ndo_set_vf_rss_query_en)
2606 			err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2607 							   ivrssq_en->setting);
2608 		if (err < 0)
2609 			return err;
2610 	}
2611 
2612 	if (tb[IFLA_VF_TRUST]) {
2613 		struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2614 
2615 		if (ivt->vf >= INT_MAX)
2616 			return -EINVAL;
2617 		err = -EOPNOTSUPP;
2618 		if (ops->ndo_set_vf_trust)
2619 			err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2620 		if (err < 0)
2621 			return err;
2622 	}
2623 
2624 	if (tb[IFLA_VF_IB_NODE_GUID]) {
2625 		struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2626 
2627 		if (ivt->vf >= INT_MAX)
2628 			return -EINVAL;
2629 		if (!ops->ndo_set_vf_guid)
2630 			return -EOPNOTSUPP;
2631 		return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2632 	}
2633 
2634 	if (tb[IFLA_VF_IB_PORT_GUID]) {
2635 		struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2636 
2637 		if (ivt->vf >= INT_MAX)
2638 			return -EINVAL;
2639 		if (!ops->ndo_set_vf_guid)
2640 			return -EOPNOTSUPP;
2641 
2642 		return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2643 	}
2644 
2645 	return err;
2646 }
2647 
do_set_master(struct net_device * dev,int ifindex,struct netlink_ext_ack * extack)2648 static int do_set_master(struct net_device *dev, int ifindex,
2649 			 struct netlink_ext_ack *extack)
2650 {
2651 	struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2652 	const struct net_device_ops *ops;
2653 	int err;
2654 
2655 	if (upper_dev) {
2656 		if (upper_dev->ifindex == ifindex)
2657 			return 0;
2658 		ops = upper_dev->netdev_ops;
2659 		if (ops->ndo_del_slave) {
2660 			err = ops->ndo_del_slave(upper_dev, dev);
2661 			if (err)
2662 				return err;
2663 		} else {
2664 			return -EOPNOTSUPP;
2665 		}
2666 	}
2667 
2668 	if (ifindex) {
2669 		upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2670 		if (!upper_dev)
2671 			return -EINVAL;
2672 		ops = upper_dev->netdev_ops;
2673 		if (ops->ndo_add_slave) {
2674 			err = ops->ndo_add_slave(upper_dev, dev, extack);
2675 			if (err)
2676 				return err;
2677 		} else {
2678 			return -EOPNOTSUPP;
2679 		}
2680 	}
2681 	return 0;
2682 }
2683 
2684 static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = {
2685 	[IFLA_PROTO_DOWN_REASON_MASK]	= { .type = NLA_U32 },
2686 	[IFLA_PROTO_DOWN_REASON_VALUE]	= { .type = NLA_U32 },
2687 };
2688 
do_set_proto_down(struct net_device * dev,struct nlattr * nl_proto_down,struct nlattr * nl_proto_down_reason,struct netlink_ext_ack * extack)2689 static int do_set_proto_down(struct net_device *dev,
2690 			     struct nlattr *nl_proto_down,
2691 			     struct nlattr *nl_proto_down_reason,
2692 			     struct netlink_ext_ack *extack)
2693 {
2694 	struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1];
2695 	unsigned long mask = 0;
2696 	u32 value;
2697 	bool proto_down;
2698 	int err;
2699 
2700 	if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN)) {
2701 		NL_SET_ERR_MSG(extack,  "Protodown not supported by device");
2702 		return -EOPNOTSUPP;
2703 	}
2704 
2705 	if (nl_proto_down_reason) {
2706 		err = nla_parse_nested_deprecated(pdreason,
2707 						  IFLA_PROTO_DOWN_REASON_MAX,
2708 						  nl_proto_down_reason,
2709 						  ifla_proto_down_reason_policy,
2710 						  NULL);
2711 		if (err < 0)
2712 			return err;
2713 
2714 		if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) {
2715 			NL_SET_ERR_MSG(extack, "Invalid protodown reason value");
2716 			return -EINVAL;
2717 		}
2718 
2719 		value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]);
2720 
2721 		if (pdreason[IFLA_PROTO_DOWN_REASON_MASK])
2722 			mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]);
2723 
2724 		dev_change_proto_down_reason(dev, mask, value);
2725 	}
2726 
2727 	if (nl_proto_down) {
2728 		proto_down = nla_get_u8(nl_proto_down);
2729 
2730 		/* Don't turn off protodown if there are active reasons */
2731 		if (!proto_down && dev->proto_down_reason) {
2732 			NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons");
2733 			return -EBUSY;
2734 		}
2735 		err = dev_change_proto_down(dev,
2736 					    proto_down);
2737 		if (err)
2738 			return err;
2739 	}
2740 
2741 	return 0;
2742 }
2743 
2744 #define DO_SETLINK_MODIFIED	0x01
2745 /* notify flag means notify + modified. */
2746 #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)2747 static int do_setlink(const struct sk_buff *skb,
2748 		      struct net_device *dev, struct ifinfomsg *ifm,
2749 		      struct netlink_ext_ack *extack,
2750 		      struct nlattr **tb, int status)
2751 {
2752 	const struct net_device_ops *ops = dev->netdev_ops;
2753 	char ifname[IFNAMSIZ];
2754 	int err;
2755 
2756 	if (tb[IFLA_IFNAME])
2757 		nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2758 	else
2759 		ifname[0] = '\0';
2760 
2761 	if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2762 		const char *pat = ifname[0] ? ifname : NULL;
2763 		struct net *net;
2764 		int new_ifindex;
2765 
2766 		net = rtnl_link_get_net_capable(skb, dev_net(dev),
2767 						tb, CAP_NET_ADMIN);
2768 		if (IS_ERR(net)) {
2769 			err = PTR_ERR(net);
2770 			goto errout;
2771 		}
2772 
2773 		if (tb[IFLA_NEW_IFINDEX])
2774 			new_ifindex = nla_get_s32(tb[IFLA_NEW_IFINDEX]);
2775 		else
2776 			new_ifindex = 0;
2777 
2778 		err = __dev_change_net_namespace(dev, net, pat, new_ifindex);
2779 		put_net(net);
2780 		if (err)
2781 			goto errout;
2782 		status |= DO_SETLINK_MODIFIED;
2783 	}
2784 
2785 	if (tb[IFLA_MAP]) {
2786 		struct rtnl_link_ifmap *u_map;
2787 		struct ifmap k_map;
2788 
2789 		if (!ops->ndo_set_config) {
2790 			err = -EOPNOTSUPP;
2791 			goto errout;
2792 		}
2793 
2794 		if (!netif_device_present(dev)) {
2795 			err = -ENODEV;
2796 			goto errout;
2797 		}
2798 
2799 		u_map = nla_data(tb[IFLA_MAP]);
2800 		k_map.mem_start = (unsigned long) u_map->mem_start;
2801 		k_map.mem_end = (unsigned long) u_map->mem_end;
2802 		k_map.base_addr = (unsigned short) u_map->base_addr;
2803 		k_map.irq = (unsigned char) u_map->irq;
2804 		k_map.dma = (unsigned char) u_map->dma;
2805 		k_map.port = (unsigned char) u_map->port;
2806 
2807 		err = ops->ndo_set_config(dev, &k_map);
2808 		if (err < 0)
2809 			goto errout;
2810 
2811 		status |= DO_SETLINK_NOTIFY;
2812 	}
2813 
2814 	if (tb[IFLA_ADDRESS]) {
2815 		struct sockaddr *sa;
2816 		int len;
2817 
2818 		len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2819 						  sizeof(*sa));
2820 		sa = kmalloc(len, GFP_KERNEL);
2821 		if (!sa) {
2822 			err = -ENOMEM;
2823 			goto errout;
2824 		}
2825 		sa->sa_family = dev->type;
2826 		memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2827 		       dev->addr_len);
2828 		err = dev_set_mac_address_user(dev, sa, extack);
2829 		kfree(sa);
2830 		if (err)
2831 			goto errout;
2832 		status |= DO_SETLINK_MODIFIED;
2833 	}
2834 
2835 	if (tb[IFLA_MTU]) {
2836 		err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2837 		if (err < 0)
2838 			goto errout;
2839 		status |= DO_SETLINK_MODIFIED;
2840 	}
2841 
2842 	if (tb[IFLA_GROUP]) {
2843 		dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2844 		status |= DO_SETLINK_NOTIFY;
2845 	}
2846 
2847 	/*
2848 	 * Interface selected by interface index but interface
2849 	 * name provided implies that a name change has been
2850 	 * requested.
2851 	 */
2852 	if (ifm->ifi_index > 0 && ifname[0]) {
2853 		err = dev_change_name(dev, ifname);
2854 		if (err < 0)
2855 			goto errout;
2856 		status |= DO_SETLINK_MODIFIED;
2857 	}
2858 
2859 	if (tb[IFLA_IFALIAS]) {
2860 		err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2861 				    nla_len(tb[IFLA_IFALIAS]));
2862 		if (err < 0)
2863 			goto errout;
2864 		status |= DO_SETLINK_NOTIFY;
2865 	}
2866 
2867 	if (tb[IFLA_BROADCAST]) {
2868 		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2869 		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2870 	}
2871 
2872 	if (ifm->ifi_flags || ifm->ifi_change) {
2873 		err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2874 				       extack);
2875 		if (err < 0)
2876 			goto errout;
2877 	}
2878 
2879 	if (tb[IFLA_MASTER]) {
2880 		err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2881 		if (err)
2882 			goto errout;
2883 		status |= DO_SETLINK_MODIFIED;
2884 	}
2885 
2886 	if (tb[IFLA_CARRIER]) {
2887 		err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2888 		if (err)
2889 			goto errout;
2890 		status |= DO_SETLINK_MODIFIED;
2891 	}
2892 
2893 	if (tb[IFLA_TXQLEN]) {
2894 		unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2895 
2896 		err = dev_change_tx_queue_len(dev, value);
2897 		if (err)
2898 			goto errout;
2899 		status |= DO_SETLINK_MODIFIED;
2900 	}
2901 
2902 	if (tb[IFLA_GSO_MAX_SIZE]) {
2903 		u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2904 
2905 		if (dev->gso_max_size ^ max_size) {
2906 			netif_set_gso_max_size(dev, max_size);
2907 			status |= DO_SETLINK_MODIFIED;
2908 		}
2909 	}
2910 
2911 	if (tb[IFLA_GSO_MAX_SEGS]) {
2912 		u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2913 
2914 		if (dev->gso_max_segs ^ max_segs) {
2915 			netif_set_gso_max_segs(dev, max_segs);
2916 			status |= DO_SETLINK_MODIFIED;
2917 		}
2918 	}
2919 
2920 	if (tb[IFLA_GRO_MAX_SIZE]) {
2921 		u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_MAX_SIZE]);
2922 
2923 		if (dev->gro_max_size ^ gro_max_size) {
2924 			netif_set_gro_max_size(dev, gro_max_size);
2925 			status |= DO_SETLINK_MODIFIED;
2926 		}
2927 	}
2928 
2929 	if (tb[IFLA_GSO_IPV4_MAX_SIZE]) {
2930 		u32 max_size = nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE]);
2931 
2932 		if (dev->gso_ipv4_max_size ^ max_size) {
2933 			netif_set_gso_ipv4_max_size(dev, max_size);
2934 			status |= DO_SETLINK_MODIFIED;
2935 		}
2936 	}
2937 
2938 	if (tb[IFLA_GRO_IPV4_MAX_SIZE]) {
2939 		u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE]);
2940 
2941 		if (dev->gro_ipv4_max_size ^ gro_max_size) {
2942 			netif_set_gro_ipv4_max_size(dev, gro_max_size);
2943 			status |= DO_SETLINK_MODIFIED;
2944 		}
2945 	}
2946 
2947 	if (tb[IFLA_OPERSTATE])
2948 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2949 
2950 	if (tb[IFLA_LINKMODE]) {
2951 		unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2952 
2953 		write_lock(&dev_base_lock);
2954 		if (dev->link_mode ^ value)
2955 			status |= DO_SETLINK_NOTIFY;
2956 		dev->link_mode = value;
2957 		write_unlock(&dev_base_lock);
2958 	}
2959 
2960 	if (tb[IFLA_VFINFO_LIST]) {
2961 		struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2962 		struct nlattr *attr;
2963 		int rem;
2964 
2965 		nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2966 			if (nla_type(attr) != IFLA_VF_INFO ||
2967 			    nla_len(attr) < NLA_HDRLEN) {
2968 				err = -EINVAL;
2969 				goto errout;
2970 			}
2971 			err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
2972 							  attr,
2973 							  ifla_vf_policy,
2974 							  NULL);
2975 			if (err < 0)
2976 				goto errout;
2977 			err = do_setvfinfo(dev, vfinfo);
2978 			if (err < 0)
2979 				goto errout;
2980 			status |= DO_SETLINK_NOTIFY;
2981 		}
2982 	}
2983 	err = 0;
2984 
2985 	if (tb[IFLA_VF_PORTS]) {
2986 		struct nlattr *port[IFLA_PORT_MAX+1];
2987 		struct nlattr *attr;
2988 		int vf;
2989 		int rem;
2990 
2991 		err = -EOPNOTSUPP;
2992 		if (!ops->ndo_set_vf_port)
2993 			goto errout;
2994 
2995 		nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2996 			if (nla_type(attr) != IFLA_VF_PORT ||
2997 			    nla_len(attr) < NLA_HDRLEN) {
2998 				err = -EINVAL;
2999 				goto errout;
3000 			}
3001 			err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
3002 							  attr,
3003 							  ifla_port_policy,
3004 							  NULL);
3005 			if (err < 0)
3006 				goto errout;
3007 			if (!port[IFLA_PORT_VF]) {
3008 				err = -EOPNOTSUPP;
3009 				goto errout;
3010 			}
3011 			vf = nla_get_u32(port[IFLA_PORT_VF]);
3012 			err = ops->ndo_set_vf_port(dev, vf, port);
3013 			if (err < 0)
3014 				goto errout;
3015 			status |= DO_SETLINK_NOTIFY;
3016 		}
3017 	}
3018 	err = 0;
3019 
3020 	if (tb[IFLA_PORT_SELF]) {
3021 		struct nlattr *port[IFLA_PORT_MAX+1];
3022 
3023 		err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
3024 						  tb[IFLA_PORT_SELF],
3025 						  ifla_port_policy, NULL);
3026 		if (err < 0)
3027 			goto errout;
3028 
3029 		err = -EOPNOTSUPP;
3030 		if (ops->ndo_set_vf_port)
3031 			err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
3032 		if (err < 0)
3033 			goto errout;
3034 		status |= DO_SETLINK_NOTIFY;
3035 	}
3036 
3037 	if (tb[IFLA_AF_SPEC]) {
3038 		struct nlattr *af;
3039 		int rem;
3040 
3041 		nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
3042 			const struct rtnl_af_ops *af_ops;
3043 
3044 			BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
3045 
3046 			err = af_ops->set_link_af(dev, af, extack);
3047 			if (err < 0)
3048 				goto errout;
3049 
3050 			status |= DO_SETLINK_NOTIFY;
3051 		}
3052 	}
3053 	err = 0;
3054 
3055 	if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) {
3056 		err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN],
3057 					tb[IFLA_PROTO_DOWN_REASON], extack);
3058 		if (err)
3059 			goto errout;
3060 		status |= DO_SETLINK_NOTIFY;
3061 	}
3062 
3063 	if (tb[IFLA_XDP]) {
3064 		struct nlattr *xdp[IFLA_XDP_MAX + 1];
3065 		u32 xdp_flags = 0;
3066 
3067 		err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
3068 						  tb[IFLA_XDP],
3069 						  ifla_xdp_policy, NULL);
3070 		if (err < 0)
3071 			goto errout;
3072 
3073 		if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
3074 			err = -EINVAL;
3075 			goto errout;
3076 		}
3077 
3078 		if (xdp[IFLA_XDP_FLAGS]) {
3079 			xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
3080 			if (xdp_flags & ~XDP_FLAGS_MASK) {
3081 				err = -EINVAL;
3082 				goto errout;
3083 			}
3084 			if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
3085 				err = -EINVAL;
3086 				goto errout;
3087 			}
3088 		}
3089 
3090 		if (xdp[IFLA_XDP_FD]) {
3091 			int expected_fd = -1;
3092 
3093 			if (xdp_flags & XDP_FLAGS_REPLACE) {
3094 				if (!xdp[IFLA_XDP_EXPECTED_FD]) {
3095 					err = -EINVAL;
3096 					goto errout;
3097 				}
3098 				expected_fd =
3099 					nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]);
3100 			}
3101 
3102 			err = dev_change_xdp_fd(dev, extack,
3103 						nla_get_s32(xdp[IFLA_XDP_FD]),
3104 						expected_fd,
3105 						xdp_flags);
3106 			if (err)
3107 				goto errout;
3108 			status |= DO_SETLINK_NOTIFY;
3109 		}
3110 	}
3111 
3112 errout:
3113 	if (status & DO_SETLINK_MODIFIED) {
3114 		if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
3115 			netdev_state_change(dev);
3116 
3117 		if (err < 0)
3118 			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",
3119 					     dev->name);
3120 	}
3121 
3122 	return err;
3123 }
3124 
rtnl_dev_get(struct net * net,struct nlattr * tb[])3125 static struct net_device *rtnl_dev_get(struct net *net,
3126 				       struct nlattr *tb[])
3127 {
3128 	char ifname[ALTIFNAMSIZ];
3129 
3130 	if (tb[IFLA_IFNAME])
3131 		nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3132 	else if (tb[IFLA_ALT_IFNAME])
3133 		nla_strscpy(ifname, tb[IFLA_ALT_IFNAME], ALTIFNAMSIZ);
3134 	else
3135 		return NULL;
3136 
3137 	return __dev_get_by_name(net, ifname);
3138 }
3139 
rtnl_setlink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3140 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3141 			struct netlink_ext_ack *extack)
3142 {
3143 	struct net *net = sock_net(skb->sk);
3144 	struct ifinfomsg *ifm;
3145 	struct net_device *dev;
3146 	int err;
3147 	struct nlattr *tb[IFLA_MAX+1];
3148 
3149 	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3150 				     ifla_policy, extack);
3151 	if (err < 0)
3152 		goto errout;
3153 
3154 	err = rtnl_ensure_unique_netns(tb, extack, false);
3155 	if (err < 0)
3156 		goto errout;
3157 
3158 	err = -EINVAL;
3159 	ifm = nlmsg_data(nlh);
3160 	if (ifm->ifi_index > 0)
3161 		dev = __dev_get_by_index(net, ifm->ifi_index);
3162 	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3163 		dev = rtnl_dev_get(net, tb);
3164 	else
3165 		goto errout;
3166 
3167 	if (dev == NULL) {
3168 		err = -ENODEV;
3169 		goto errout;
3170 	}
3171 
3172 	err = validate_linkmsg(dev, tb, extack);
3173 	if (err < 0)
3174 		goto errout;
3175 
3176 	err = do_setlink(skb, dev, ifm, extack, tb, 0);
3177 errout:
3178 	return err;
3179 }
3180 
rtnl_group_dellink(const struct net * net,int group)3181 static int rtnl_group_dellink(const struct net *net, int group)
3182 {
3183 	struct net_device *dev, *aux;
3184 	LIST_HEAD(list_kill);
3185 	bool found = false;
3186 
3187 	if (!group)
3188 		return -EPERM;
3189 
3190 	for_each_netdev(net, dev) {
3191 		if (dev->group == group) {
3192 			const struct rtnl_link_ops *ops;
3193 
3194 			found = true;
3195 			ops = dev->rtnl_link_ops;
3196 			if (!ops || !ops->dellink)
3197 				return -EOPNOTSUPP;
3198 		}
3199 	}
3200 
3201 	if (!found)
3202 		return -ENODEV;
3203 
3204 	for_each_netdev_safe(net, dev, aux) {
3205 		if (dev->group == group) {
3206 			const struct rtnl_link_ops *ops;
3207 
3208 			ops = dev->rtnl_link_ops;
3209 			ops->dellink(dev, &list_kill);
3210 		}
3211 	}
3212 	unregister_netdevice_many(&list_kill);
3213 
3214 	return 0;
3215 }
3216 
rtnl_delete_link(struct net_device * dev,u32 portid,const struct nlmsghdr * nlh)3217 int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh)
3218 {
3219 	const struct rtnl_link_ops *ops;
3220 	LIST_HEAD(list_kill);
3221 
3222 	ops = dev->rtnl_link_ops;
3223 	if (!ops || !ops->dellink)
3224 		return -EOPNOTSUPP;
3225 
3226 	ops->dellink(dev, &list_kill);
3227 	unregister_netdevice_many_notify(&list_kill, portid, nlh);
3228 
3229 	return 0;
3230 }
3231 EXPORT_SYMBOL_GPL(rtnl_delete_link);
3232 
rtnl_dellink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3233 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
3234 			struct netlink_ext_ack *extack)
3235 {
3236 	struct net *net = sock_net(skb->sk);
3237 	u32 portid = NETLINK_CB(skb).portid;
3238 	struct net *tgt_net = net;
3239 	struct net_device *dev = NULL;
3240 	struct ifinfomsg *ifm;
3241 	struct nlattr *tb[IFLA_MAX+1];
3242 	int err;
3243 	int netnsid = -1;
3244 
3245 	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3246 				     ifla_policy, extack);
3247 	if (err < 0)
3248 		return err;
3249 
3250 	err = rtnl_ensure_unique_netns(tb, extack, true);
3251 	if (err < 0)
3252 		return err;
3253 
3254 	if (tb[IFLA_TARGET_NETNSID]) {
3255 		netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3256 		tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3257 		if (IS_ERR(tgt_net))
3258 			return PTR_ERR(tgt_net);
3259 	}
3260 
3261 	err = -EINVAL;
3262 	ifm = nlmsg_data(nlh);
3263 	if (ifm->ifi_index > 0)
3264 		dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3265 	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3266 		dev = rtnl_dev_get(net, tb);
3267 	else if (tb[IFLA_GROUP])
3268 		err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
3269 	else
3270 		goto out;
3271 
3272 	if (!dev) {
3273 		if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME] || ifm->ifi_index > 0)
3274 			err = -ENODEV;
3275 
3276 		goto out;
3277 	}
3278 
3279 	err = rtnl_delete_link(dev, portid, nlh);
3280 
3281 out:
3282 	if (netnsid >= 0)
3283 		put_net(tgt_net);
3284 
3285 	return err;
3286 }
3287 
rtnl_configure_link(struct net_device * dev,const struct ifinfomsg * ifm,u32 portid,const struct nlmsghdr * nlh)3288 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm,
3289 			u32 portid, const struct nlmsghdr *nlh)
3290 {
3291 	unsigned int old_flags;
3292 	int err;
3293 
3294 	old_flags = dev->flags;
3295 	if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
3296 		err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
3297 					 NULL);
3298 		if (err < 0)
3299 			return err;
3300 	}
3301 
3302 	if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
3303 		__dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags), portid, nlh);
3304 	} else {
3305 		dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
3306 		__dev_notify_flags(dev, old_flags, ~0U, portid, nlh);
3307 	}
3308 	return 0;
3309 }
3310 EXPORT_SYMBOL(rtnl_configure_link);
3311 
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)3312 struct net_device *rtnl_create_link(struct net *net, const char *ifname,
3313 				    unsigned char name_assign_type,
3314 				    const struct rtnl_link_ops *ops,
3315 				    struct nlattr *tb[],
3316 				    struct netlink_ext_ack *extack)
3317 {
3318 	struct net_device *dev;
3319 	unsigned int num_tx_queues = 1;
3320 	unsigned int num_rx_queues = 1;
3321 	int err;
3322 
3323 	if (tb[IFLA_NUM_TX_QUEUES])
3324 		num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
3325 	else if (ops->get_num_tx_queues)
3326 		num_tx_queues = ops->get_num_tx_queues();
3327 
3328 	if (tb[IFLA_NUM_RX_QUEUES])
3329 		num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
3330 	else if (ops->get_num_rx_queues)
3331 		num_rx_queues = ops->get_num_rx_queues();
3332 
3333 	if (num_tx_queues < 1 || num_tx_queues > 4096) {
3334 		NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
3335 		return ERR_PTR(-EINVAL);
3336 	}
3337 
3338 	if (num_rx_queues < 1 || num_rx_queues > 4096) {
3339 		NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
3340 		return ERR_PTR(-EINVAL);
3341 	}
3342 
3343 	if (ops->alloc) {
3344 		dev = ops->alloc(tb, ifname, name_assign_type,
3345 				 num_tx_queues, num_rx_queues);
3346 		if (IS_ERR(dev))
3347 			return dev;
3348 	} else {
3349 		dev = alloc_netdev_mqs(ops->priv_size, ifname,
3350 				       name_assign_type, ops->setup,
3351 				       num_tx_queues, num_rx_queues);
3352 	}
3353 
3354 	if (!dev)
3355 		return ERR_PTR(-ENOMEM);
3356 
3357 	err = validate_linkmsg(dev, tb, extack);
3358 	if (err < 0) {
3359 		free_netdev(dev);
3360 		return ERR_PTR(err);
3361 	}
3362 
3363 	dev_net_set(dev, net);
3364 	dev->rtnl_link_ops = ops;
3365 	dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
3366 
3367 	if (tb[IFLA_MTU]) {
3368 		u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3369 
3370 		err = dev_validate_mtu(dev, mtu, extack);
3371 		if (err) {
3372 			free_netdev(dev);
3373 			return ERR_PTR(err);
3374 		}
3375 		dev->mtu = mtu;
3376 	}
3377 	if (tb[IFLA_ADDRESS]) {
3378 		__dev_addr_set(dev, nla_data(tb[IFLA_ADDRESS]),
3379 			       nla_len(tb[IFLA_ADDRESS]));
3380 		dev->addr_assign_type = NET_ADDR_SET;
3381 	}
3382 	if (tb[IFLA_BROADCAST])
3383 		memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
3384 				nla_len(tb[IFLA_BROADCAST]));
3385 	if (tb[IFLA_TXQLEN])
3386 		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
3387 	if (tb[IFLA_OPERSTATE])
3388 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
3389 	if (tb[IFLA_LINKMODE])
3390 		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
3391 	if (tb[IFLA_GROUP])
3392 		dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
3393 	if (tb[IFLA_GSO_MAX_SIZE])
3394 		netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
3395 	if (tb[IFLA_GSO_MAX_SEGS])
3396 		netif_set_gso_max_segs(dev, nla_get_u32(tb[IFLA_GSO_MAX_SEGS]));
3397 	if (tb[IFLA_GRO_MAX_SIZE])
3398 		netif_set_gro_max_size(dev, nla_get_u32(tb[IFLA_GRO_MAX_SIZE]));
3399 	if (tb[IFLA_GSO_IPV4_MAX_SIZE])
3400 		netif_set_gso_ipv4_max_size(dev, nla_get_u32(tb[IFLA_GSO_IPV4_MAX_SIZE]));
3401 	if (tb[IFLA_GRO_IPV4_MAX_SIZE])
3402 		netif_set_gro_ipv4_max_size(dev, nla_get_u32(tb[IFLA_GRO_IPV4_MAX_SIZE]));
3403 
3404 	return dev;
3405 }
3406 EXPORT_SYMBOL(rtnl_create_link);
3407 
rtnl_group_changelink(const struct sk_buff * skb,struct net * net,int group,struct ifinfomsg * ifm,struct netlink_ext_ack * extack,struct nlattr ** tb)3408 static int rtnl_group_changelink(const struct sk_buff *skb,
3409 		struct net *net, int group,
3410 		struct ifinfomsg *ifm,
3411 		struct netlink_ext_ack *extack,
3412 		struct nlattr **tb)
3413 {
3414 	struct net_device *dev, *aux;
3415 	int err;
3416 
3417 	for_each_netdev_safe(net, dev, aux) {
3418 		if (dev->group == group) {
3419 			err = validate_linkmsg(dev, tb, extack);
3420 			if (err < 0)
3421 				return err;
3422 			err = do_setlink(skb, dev, ifm, extack, tb, 0);
3423 			if (err < 0)
3424 				return err;
3425 		}
3426 	}
3427 
3428 	return 0;
3429 }
3430 
rtnl_newlink_create(struct sk_buff * skb,struct ifinfomsg * ifm,const struct rtnl_link_ops * ops,const struct nlmsghdr * nlh,struct nlattr ** tb,struct nlattr ** data,struct netlink_ext_ack * extack)3431 static int rtnl_newlink_create(struct sk_buff *skb, struct ifinfomsg *ifm,
3432 			       const struct rtnl_link_ops *ops,
3433 			       const struct nlmsghdr *nlh,
3434 			       struct nlattr **tb, struct nlattr **data,
3435 			       struct netlink_ext_ack *extack)
3436 {
3437 	unsigned char name_assign_type = NET_NAME_USER;
3438 	struct net *net = sock_net(skb->sk);
3439 	u32 portid = NETLINK_CB(skb).portid;
3440 	struct net *dest_net, *link_net;
3441 	struct net_device *dev;
3442 	char ifname[IFNAMSIZ];
3443 	int err;
3444 
3445 	if (!ops->alloc && !ops->setup)
3446 		return -EOPNOTSUPP;
3447 
3448 	if (tb[IFLA_IFNAME]) {
3449 		nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3450 	} else {
3451 		snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3452 		name_assign_type = NET_NAME_ENUM;
3453 	}
3454 
3455 	dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3456 	if (IS_ERR(dest_net))
3457 		return PTR_ERR(dest_net);
3458 
3459 	if (tb[IFLA_LINK_NETNSID]) {
3460 		int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3461 
3462 		link_net = get_net_ns_by_id(dest_net, id);
3463 		if (!link_net) {
3464 			NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3465 			err =  -EINVAL;
3466 			goto out;
3467 		}
3468 		err = -EPERM;
3469 		if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3470 			goto out;
3471 	} else {
3472 		link_net = NULL;
3473 	}
3474 
3475 	dev = rtnl_create_link(link_net ? : dest_net, ifname,
3476 			       name_assign_type, ops, tb, extack);
3477 	if (IS_ERR(dev)) {
3478 		err = PTR_ERR(dev);
3479 		goto out;
3480 	}
3481 
3482 	dev->ifindex = ifm->ifi_index;
3483 
3484 	if (ops->newlink)
3485 		err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3486 	else
3487 		err = register_netdevice(dev);
3488 	if (err < 0) {
3489 		free_netdev(dev);
3490 		goto out;
3491 	}
3492 
3493 	err = rtnl_configure_link(dev, ifm, portid, nlh);
3494 	if (err < 0)
3495 		goto out_unregister;
3496 	if (link_net) {
3497 		err = dev_change_net_namespace(dev, dest_net, ifname);
3498 		if (err < 0)
3499 			goto out_unregister;
3500 	}
3501 	if (tb[IFLA_MASTER]) {
3502 		err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3503 		if (err)
3504 			goto out_unregister;
3505 	}
3506 out:
3507 	if (link_net)
3508 		put_net(link_net);
3509 	put_net(dest_net);
3510 	return err;
3511 out_unregister:
3512 	if (ops->newlink) {
3513 		LIST_HEAD(list_kill);
3514 
3515 		ops->dellink(dev, &list_kill);
3516 		unregister_netdevice_many(&list_kill);
3517 	} else {
3518 		unregister_netdevice(dev);
3519 	}
3520 	goto out;
3521 }
3522 
3523 struct rtnl_newlink_tbs {
3524 	struct nlattr *tb[IFLA_MAX + 1];
3525 	struct nlattr *attr[RTNL_MAX_TYPE + 1];
3526 	struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3527 };
3528 
__rtnl_newlink(struct sk_buff * skb,struct nlmsghdr * nlh,struct rtnl_newlink_tbs * tbs,struct netlink_ext_ack * extack)3529 static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3530 			  struct rtnl_newlink_tbs *tbs,
3531 			  struct netlink_ext_ack *extack)
3532 {
3533 	struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
3534 	struct nlattr ** const tb = tbs->tb;
3535 	const struct rtnl_link_ops *m_ops;
3536 	struct net_device *master_dev;
3537 	struct net *net = sock_net(skb->sk);
3538 	const struct rtnl_link_ops *ops;
3539 	struct nlattr **slave_data;
3540 	char kind[MODULE_NAME_LEN];
3541 	struct net_device *dev;
3542 	struct ifinfomsg *ifm;
3543 	struct nlattr **data;
3544 	bool link_specified;
3545 	int err;
3546 
3547 #ifdef CONFIG_MODULES
3548 replay:
3549 #endif
3550 	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3551 				     ifla_policy, extack);
3552 	if (err < 0)
3553 		return err;
3554 
3555 	err = rtnl_ensure_unique_netns(tb, extack, false);
3556 	if (err < 0)
3557 		return err;
3558 
3559 	ifm = nlmsg_data(nlh);
3560 	if (ifm->ifi_index > 0) {
3561 		link_specified = true;
3562 		dev = __dev_get_by_index(net, ifm->ifi_index);
3563 	} else if (ifm->ifi_index < 0) {
3564 		NL_SET_ERR_MSG(extack, "ifindex can't be negative");
3565 		return -EINVAL;
3566 	} else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) {
3567 		link_specified = true;
3568 		dev = rtnl_dev_get(net, tb);
3569 	} else {
3570 		link_specified = false;
3571 		dev = NULL;
3572 	}
3573 
3574 	master_dev = NULL;
3575 	m_ops = NULL;
3576 	if (dev) {
3577 		master_dev = netdev_master_upper_dev_get(dev);
3578 		if (master_dev)
3579 			m_ops = master_dev->rtnl_link_ops;
3580 	}
3581 
3582 	if (tb[IFLA_LINKINFO]) {
3583 		err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3584 						  tb[IFLA_LINKINFO],
3585 						  ifla_info_policy, NULL);
3586 		if (err < 0)
3587 			return err;
3588 	} else
3589 		memset(linkinfo, 0, sizeof(linkinfo));
3590 
3591 	if (linkinfo[IFLA_INFO_KIND]) {
3592 		nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3593 		ops = rtnl_link_ops_get(kind);
3594 	} else {
3595 		kind[0] = '\0';
3596 		ops = NULL;
3597 	}
3598 
3599 	data = NULL;
3600 	if (ops) {
3601 		if (ops->maxtype > RTNL_MAX_TYPE)
3602 			return -EINVAL;
3603 
3604 		if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3605 			err = nla_parse_nested_deprecated(tbs->attr, ops->maxtype,
3606 							  linkinfo[IFLA_INFO_DATA],
3607 							  ops->policy, extack);
3608 			if (err < 0)
3609 				return err;
3610 			data = tbs->attr;
3611 		}
3612 		if (ops->validate) {
3613 			err = ops->validate(tb, data, extack);
3614 			if (err < 0)
3615 				return err;
3616 		}
3617 	}
3618 
3619 	slave_data = NULL;
3620 	if (m_ops) {
3621 		if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3622 			return -EINVAL;
3623 
3624 		if (m_ops->slave_maxtype &&
3625 		    linkinfo[IFLA_INFO_SLAVE_DATA]) {
3626 			err = nla_parse_nested_deprecated(tbs->slave_attr,
3627 							  m_ops->slave_maxtype,
3628 							  linkinfo[IFLA_INFO_SLAVE_DATA],
3629 							  m_ops->slave_policy,
3630 							  extack);
3631 			if (err < 0)
3632 				return err;
3633 			slave_data = tbs->slave_attr;
3634 		}
3635 	}
3636 
3637 	if (dev) {
3638 		int status = 0;
3639 
3640 		if (nlh->nlmsg_flags & NLM_F_EXCL)
3641 			return -EEXIST;
3642 		if (nlh->nlmsg_flags & NLM_F_REPLACE)
3643 			return -EOPNOTSUPP;
3644 
3645 		err = validate_linkmsg(dev, tb, extack);
3646 		if (err < 0)
3647 			return err;
3648 
3649 		if (linkinfo[IFLA_INFO_DATA]) {
3650 			if (!ops || ops != dev->rtnl_link_ops ||
3651 			    !ops->changelink)
3652 				return -EOPNOTSUPP;
3653 
3654 			err = ops->changelink(dev, tb, data, extack);
3655 			if (err < 0)
3656 				return err;
3657 			status |= DO_SETLINK_NOTIFY;
3658 		}
3659 
3660 		if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3661 			if (!m_ops || !m_ops->slave_changelink)
3662 				return -EOPNOTSUPP;
3663 
3664 			err = m_ops->slave_changelink(master_dev, dev, tb,
3665 						      slave_data, extack);
3666 			if (err < 0)
3667 				return err;
3668 			status |= DO_SETLINK_NOTIFY;
3669 		}
3670 
3671 		return do_setlink(skb, dev, ifm, extack, tb, status);
3672 	}
3673 
3674 	if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3675 		/* No dev found and NLM_F_CREATE not set. Requested dev does not exist,
3676 		 * or it's for a group
3677 		*/
3678 		if (link_specified)
3679 			return -ENODEV;
3680 		if (tb[IFLA_GROUP])
3681 			return rtnl_group_changelink(skb, net,
3682 						nla_get_u32(tb[IFLA_GROUP]),
3683 						ifm, extack, tb);
3684 		return -ENODEV;
3685 	}
3686 
3687 	if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3688 		return -EOPNOTSUPP;
3689 
3690 	if (!ops) {
3691 #ifdef CONFIG_MODULES
3692 		if (kind[0]) {
3693 			__rtnl_unlock();
3694 			request_module("rtnl-link-%s", kind);
3695 			rtnl_lock();
3696 			ops = rtnl_link_ops_get(kind);
3697 			if (ops)
3698 				goto replay;
3699 		}
3700 #endif
3701 		NL_SET_ERR_MSG(extack, "Unknown device type");
3702 		return -EOPNOTSUPP;
3703 	}
3704 
3705 	return rtnl_newlink_create(skb, ifm, ops, nlh, tb, data, extack);
3706 }
3707 
rtnl_newlink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3708 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3709 			struct netlink_ext_ack *extack)
3710 {
3711 	struct rtnl_newlink_tbs *tbs;
3712 	int ret;
3713 
3714 	tbs = kmalloc(sizeof(*tbs), GFP_KERNEL);
3715 	if (!tbs)
3716 		return -ENOMEM;
3717 
3718 	ret = __rtnl_newlink(skb, nlh, tbs, extack);
3719 	kfree(tbs);
3720 	return ret;
3721 }
3722 
rtnl_valid_getlink_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)3723 static int rtnl_valid_getlink_req(struct sk_buff *skb,
3724 				  const struct nlmsghdr *nlh,
3725 				  struct nlattr **tb,
3726 				  struct netlink_ext_ack *extack)
3727 {
3728 	struct ifinfomsg *ifm;
3729 	int i, err;
3730 
3731 	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3732 		NL_SET_ERR_MSG(extack, "Invalid header for get link");
3733 		return -EINVAL;
3734 	}
3735 
3736 	if (!netlink_strict_get_check(skb))
3737 		return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3738 					      ifla_policy, extack);
3739 
3740 	ifm = nlmsg_data(nlh);
3741 	if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3742 	    ifm->ifi_change) {
3743 		NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3744 		return -EINVAL;
3745 	}
3746 
3747 	err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3748 					    ifla_policy, extack);
3749 	if (err)
3750 		return err;
3751 
3752 	for (i = 0; i <= IFLA_MAX; i++) {
3753 		if (!tb[i])
3754 			continue;
3755 
3756 		switch (i) {
3757 		case IFLA_IFNAME:
3758 		case IFLA_ALT_IFNAME:
3759 		case IFLA_EXT_MASK:
3760 		case IFLA_TARGET_NETNSID:
3761 			break;
3762 		default:
3763 			NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3764 			return -EINVAL;
3765 		}
3766 	}
3767 
3768 	return 0;
3769 }
3770 
rtnl_getlink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3771 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3772 			struct netlink_ext_ack *extack)
3773 {
3774 	struct net *net = sock_net(skb->sk);
3775 	struct net *tgt_net = net;
3776 	struct ifinfomsg *ifm;
3777 	struct nlattr *tb[IFLA_MAX+1];
3778 	struct net_device *dev = NULL;
3779 	struct sk_buff *nskb;
3780 	int netnsid = -1;
3781 	int err;
3782 	u32 ext_filter_mask = 0;
3783 
3784 	err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3785 	if (err < 0)
3786 		return err;
3787 
3788 	err = rtnl_ensure_unique_netns(tb, extack, true);
3789 	if (err < 0)
3790 		return err;
3791 
3792 	if (tb[IFLA_TARGET_NETNSID]) {
3793 		netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3794 		tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3795 		if (IS_ERR(tgt_net))
3796 			return PTR_ERR(tgt_net);
3797 	}
3798 
3799 	if (tb[IFLA_EXT_MASK])
3800 		ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3801 
3802 	err = -EINVAL;
3803 	ifm = nlmsg_data(nlh);
3804 	if (ifm->ifi_index > 0)
3805 		dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3806 	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3807 		dev = rtnl_dev_get(tgt_net, tb);
3808 	else
3809 		goto out;
3810 
3811 	err = -ENODEV;
3812 	if (dev == NULL)
3813 		goto out;
3814 
3815 	err = -ENOBUFS;
3816 	nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3817 	if (nskb == NULL)
3818 		goto out;
3819 
3820 	err = rtnl_fill_ifinfo(nskb, dev, net,
3821 			       RTM_NEWLINK, NETLINK_CB(skb).portid,
3822 			       nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3823 			       0, NULL, 0, netnsid, GFP_KERNEL);
3824 	if (err < 0) {
3825 		/* -EMSGSIZE implies BUG in if_nlmsg_size */
3826 		WARN_ON(err == -EMSGSIZE);
3827 		kfree_skb(nskb);
3828 	} else
3829 		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3830 out:
3831 	if (netnsid >= 0)
3832 		put_net(tgt_net);
3833 
3834 	return err;
3835 }
3836 
rtnl_alt_ifname(int cmd,struct net_device * dev,struct nlattr * attr,bool * changed,struct netlink_ext_ack * extack)3837 static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
3838 			   bool *changed, struct netlink_ext_ack *extack)
3839 {
3840 	char *alt_ifname;
3841 	size_t size;
3842 	int err;
3843 
3844 	err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
3845 	if (err)
3846 		return err;
3847 
3848 	if (cmd == RTM_NEWLINKPROP) {
3849 		size = rtnl_prop_list_size(dev);
3850 		size += nla_total_size(ALTIFNAMSIZ);
3851 		if (size >= U16_MAX) {
3852 			NL_SET_ERR_MSG(extack,
3853 				       "effective property list too long");
3854 			return -EINVAL;
3855 		}
3856 	}
3857 
3858 	alt_ifname = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
3859 	if (!alt_ifname)
3860 		return -ENOMEM;
3861 
3862 	if (cmd == RTM_NEWLINKPROP) {
3863 		err = netdev_name_node_alt_create(dev, alt_ifname);
3864 		if (!err)
3865 			alt_ifname = NULL;
3866 	} else if (cmd == RTM_DELLINKPROP) {
3867 		err = netdev_name_node_alt_destroy(dev, alt_ifname);
3868 	} else {
3869 		WARN_ON_ONCE(1);
3870 		err = -EINVAL;
3871 	}
3872 
3873 	kfree(alt_ifname);
3874 	if (!err)
3875 		*changed = true;
3876 	return err;
3877 }
3878 
rtnl_linkprop(int cmd,struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3879 static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
3880 			 struct netlink_ext_ack *extack)
3881 {
3882 	struct net *net = sock_net(skb->sk);
3883 	struct nlattr *tb[IFLA_MAX + 1];
3884 	struct net_device *dev;
3885 	struct ifinfomsg *ifm;
3886 	bool changed = false;
3887 	struct nlattr *attr;
3888 	int err, rem;
3889 
3890 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3891 	if (err)
3892 		return err;
3893 
3894 	err = rtnl_ensure_unique_netns(tb, extack, true);
3895 	if (err)
3896 		return err;
3897 
3898 	ifm = nlmsg_data(nlh);
3899 	if (ifm->ifi_index > 0)
3900 		dev = __dev_get_by_index(net, ifm->ifi_index);
3901 	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3902 		dev = rtnl_dev_get(net, tb);
3903 	else
3904 		return -EINVAL;
3905 
3906 	if (!dev)
3907 		return -ENODEV;
3908 
3909 	if (!tb[IFLA_PROP_LIST])
3910 		return 0;
3911 
3912 	nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
3913 		switch (nla_type(attr)) {
3914 		case IFLA_ALT_IFNAME:
3915 			err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
3916 			if (err)
3917 				return err;
3918 			break;
3919 		}
3920 	}
3921 
3922 	if (changed)
3923 		netdev_state_change(dev);
3924 	return 0;
3925 }
3926 
rtnl_newlinkprop(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3927 static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3928 			    struct netlink_ext_ack *extack)
3929 {
3930 	return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
3931 }
3932 
rtnl_dellinkprop(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3933 static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3934 			    struct netlink_ext_ack *extack)
3935 {
3936 	return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
3937 }
3938 
rtnl_calcit(struct sk_buff * skb,struct nlmsghdr * nlh)3939 static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3940 {
3941 	struct net *net = sock_net(skb->sk);
3942 	size_t min_ifinfo_dump_size = 0;
3943 	struct nlattr *tb[IFLA_MAX+1];
3944 	u32 ext_filter_mask = 0;
3945 	struct net_device *dev;
3946 	int hdrlen;
3947 
3948 	/* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3949 	hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3950 		 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3951 
3952 	if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3953 		if (tb[IFLA_EXT_MASK])
3954 			ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3955 	}
3956 
3957 	if (!ext_filter_mask)
3958 		return NLMSG_GOODSIZE;
3959 	/*
3960 	 * traverse the list of net devices and compute the minimum
3961 	 * buffer size based upon the filter mask.
3962 	 */
3963 	rcu_read_lock();
3964 	for_each_netdev_rcu(net, dev) {
3965 		min_ifinfo_dump_size = max(min_ifinfo_dump_size,
3966 					   if_nlmsg_size(dev, ext_filter_mask));
3967 	}
3968 	rcu_read_unlock();
3969 
3970 	return nlmsg_total_size(min_ifinfo_dump_size);
3971 }
3972 
rtnl_dump_all(struct sk_buff * skb,struct netlink_callback * cb)3973 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3974 {
3975 	int idx;
3976 	int s_idx = cb->family;
3977 	int type = cb->nlh->nlmsg_type - RTM_BASE;
3978 	int ret = 0;
3979 
3980 	if (s_idx == 0)
3981 		s_idx = 1;
3982 
3983 	for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3984 		struct rtnl_link __rcu **tab;
3985 		struct rtnl_link *link;
3986 		rtnl_dumpit_func dumpit;
3987 
3988 		if (idx < s_idx || idx == PF_PACKET)
3989 			continue;
3990 
3991 		if (type < 0 || type >= RTM_NR_MSGTYPES)
3992 			continue;
3993 
3994 		tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3995 		if (!tab)
3996 			continue;
3997 
3998 		link = rcu_dereference_rtnl(tab[type]);
3999 		if (!link)
4000 			continue;
4001 
4002 		dumpit = link->dumpit;
4003 		if (!dumpit)
4004 			continue;
4005 
4006 		if (idx > s_idx) {
4007 			memset(&cb->args[0], 0, sizeof(cb->args));
4008 			cb->prev_seq = 0;
4009 			cb->seq = 0;
4010 		}
4011 		ret = dumpit(skb, cb);
4012 		if (ret)
4013 			break;
4014 	}
4015 	cb->family = idx;
4016 
4017 	return skb->len ? : ret;
4018 }
4019 
rtmsg_ifinfo_build_skb(int type,struct net_device * dev,unsigned int change,u32 event,gfp_t flags,int * new_nsid,int new_ifindex,u32 portid,const struct nlmsghdr * nlh)4020 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
4021 				       unsigned int change,
4022 				       u32 event, gfp_t flags, int *new_nsid,
4023 				       int new_ifindex, u32 portid,
4024 				       const struct nlmsghdr *nlh)
4025 {
4026 	struct net *net = dev_net(dev);
4027 	struct sk_buff *skb;
4028 	int err = -ENOBUFS;
4029 	u32 seq = 0;
4030 
4031 	skb = nlmsg_new(if_nlmsg_size(dev, 0), flags);
4032 	if (skb == NULL)
4033 		goto errout;
4034 
4035 	if (nlmsg_report(nlh))
4036 		seq = nlmsg_seq(nlh);
4037 	else
4038 		portid = 0;
4039 
4040 	err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
4041 			       type, portid, seq, change, 0, 0, event,
4042 			       new_nsid, new_ifindex, -1, flags);
4043 	if (err < 0) {
4044 		/* -EMSGSIZE implies BUG in if_nlmsg_size() */
4045 		WARN_ON(err == -EMSGSIZE);
4046 		kfree_skb(skb);
4047 		goto errout;
4048 	}
4049 	return skb;
4050 errout:
4051 	if (err < 0)
4052 		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4053 	return NULL;
4054 }
4055 
rtmsg_ifinfo_send(struct sk_buff * skb,struct net_device * dev,gfp_t flags,u32 portid,const struct nlmsghdr * nlh)4056 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags,
4057 		       u32 portid, const struct nlmsghdr *nlh)
4058 {
4059 	struct net *net = dev_net(dev);
4060 
4061 	rtnl_notify(skb, net, portid, RTNLGRP_LINK, nlh, flags);
4062 }
4063 
rtmsg_ifinfo_event(int type,struct net_device * dev,unsigned int change,u32 event,gfp_t flags,int * new_nsid,int new_ifindex,u32 portid,const struct nlmsghdr * nlh)4064 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
4065 			       unsigned int change, u32 event,
4066 			       gfp_t flags, int *new_nsid, int new_ifindex,
4067 			       u32 portid, const struct nlmsghdr *nlh)
4068 {
4069 	struct sk_buff *skb;
4070 
4071 	if (dev->reg_state != NETREG_REGISTERED)
4072 		return;
4073 
4074 	skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
4075 				     new_ifindex, portid, nlh);
4076 	if (skb)
4077 		rtmsg_ifinfo_send(skb, dev, flags, portid, nlh);
4078 }
4079 
rtmsg_ifinfo(int type,struct net_device * dev,unsigned int change,gfp_t flags,u32 portid,const struct nlmsghdr * nlh)4080 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
4081 		  gfp_t flags, u32 portid, const struct nlmsghdr *nlh)
4082 {
4083 	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
4084 			   NULL, 0, portid, nlh);
4085 }
4086 
rtmsg_ifinfo_newnet(int type,struct net_device * dev,unsigned int change,gfp_t flags,int * new_nsid,int new_ifindex)4087 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
4088 			 gfp_t flags, int *new_nsid, int new_ifindex)
4089 {
4090 	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
4091 			   new_nsid, new_ifindex, 0, NULL);
4092 }
4093 
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)4094 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
4095 				   struct net_device *dev,
4096 				   u8 *addr, u16 vid, u32 pid, u32 seq,
4097 				   int type, unsigned int flags,
4098 				   int nlflags, u16 ndm_state)
4099 {
4100 	struct nlmsghdr *nlh;
4101 	struct ndmsg *ndm;
4102 
4103 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
4104 	if (!nlh)
4105 		return -EMSGSIZE;
4106 
4107 	ndm = nlmsg_data(nlh);
4108 	ndm->ndm_family  = AF_BRIDGE;
4109 	ndm->ndm_pad1	 = 0;
4110 	ndm->ndm_pad2    = 0;
4111 	ndm->ndm_flags	 = flags;
4112 	ndm->ndm_type	 = 0;
4113 	ndm->ndm_ifindex = dev->ifindex;
4114 	ndm->ndm_state   = ndm_state;
4115 
4116 	if (nla_put(skb, NDA_LLADDR, dev->addr_len, addr))
4117 		goto nla_put_failure;
4118 	if (vid)
4119 		if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
4120 			goto nla_put_failure;
4121 
4122 	nlmsg_end(skb, nlh);
4123 	return 0;
4124 
4125 nla_put_failure:
4126 	nlmsg_cancel(skb, nlh);
4127 	return -EMSGSIZE;
4128 }
4129 
rtnl_fdb_nlmsg_size(const struct net_device * dev)4130 static inline size_t rtnl_fdb_nlmsg_size(const struct net_device *dev)
4131 {
4132 	return NLMSG_ALIGN(sizeof(struct ndmsg)) +
4133 	       nla_total_size(dev->addr_len) +	/* NDA_LLADDR */
4134 	       nla_total_size(sizeof(u16)) +	/* NDA_VLAN */
4135 	       0;
4136 }
4137 
rtnl_fdb_notify(struct net_device * dev,u8 * addr,u16 vid,int type,u16 ndm_state)4138 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
4139 			    u16 ndm_state)
4140 {
4141 	struct net *net = dev_net(dev);
4142 	struct sk_buff *skb;
4143 	int err = -ENOBUFS;
4144 
4145 	skb = nlmsg_new(rtnl_fdb_nlmsg_size(dev), GFP_ATOMIC);
4146 	if (!skb)
4147 		goto errout;
4148 
4149 	err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
4150 				      0, 0, type, NTF_SELF, 0, ndm_state);
4151 	if (err < 0) {
4152 		kfree_skb(skb);
4153 		goto errout;
4154 	}
4155 
4156 	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
4157 	return;
4158 errout:
4159 	rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
4160 }
4161 
4162 /*
4163  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
4164  */
ndo_dflt_fdb_add(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid,u16 flags)4165 int ndo_dflt_fdb_add(struct ndmsg *ndm,
4166 		     struct nlattr *tb[],
4167 		     struct net_device *dev,
4168 		     const unsigned char *addr, u16 vid,
4169 		     u16 flags)
4170 {
4171 	int err = -EINVAL;
4172 
4173 	/* If aging addresses are supported device will need to
4174 	 * implement its own handler for this.
4175 	 */
4176 	if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
4177 		netdev_info(dev, "default FDB implementation only supports local addresses\n");
4178 		return err;
4179 	}
4180 
4181 	if (tb[NDA_FLAGS_EXT]) {
4182 		netdev_info(dev, "invalid flags given to default FDB implementation\n");
4183 		return err;
4184 	}
4185 
4186 	if (vid) {
4187 		netdev_info(dev, "vlans aren't supported yet for dev_uc|mc_add()\n");
4188 		return err;
4189 	}
4190 
4191 	if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
4192 		err = dev_uc_add_excl(dev, addr);
4193 	else if (is_multicast_ether_addr(addr))
4194 		err = dev_mc_add_excl(dev, addr);
4195 
4196 	/* Only return duplicate errors if NLM_F_EXCL is set */
4197 	if (err == -EEXIST && !(flags & NLM_F_EXCL))
4198 		err = 0;
4199 
4200 	return err;
4201 }
4202 EXPORT_SYMBOL(ndo_dflt_fdb_add);
4203 
fdb_vid_parse(struct nlattr * vlan_attr,u16 * p_vid,struct netlink_ext_ack * extack)4204 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
4205 			 struct netlink_ext_ack *extack)
4206 {
4207 	u16 vid = 0;
4208 
4209 	if (vlan_attr) {
4210 		if (nla_len(vlan_attr) != sizeof(u16)) {
4211 			NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
4212 			return -EINVAL;
4213 		}
4214 
4215 		vid = nla_get_u16(vlan_attr);
4216 
4217 		if (!vid || vid >= VLAN_VID_MASK) {
4218 			NL_SET_ERR_MSG(extack, "invalid vlan id");
4219 			return -EINVAL;
4220 		}
4221 	}
4222 	*p_vid = vid;
4223 	return 0;
4224 }
4225 
rtnl_fdb_add(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4226 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
4227 			struct netlink_ext_ack *extack)
4228 {
4229 	struct net *net = sock_net(skb->sk);
4230 	struct ndmsg *ndm;
4231 	struct nlattr *tb[NDA_MAX+1];
4232 	struct net_device *dev;
4233 	u8 *addr;
4234 	u16 vid;
4235 	int err;
4236 
4237 	err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
4238 				     extack);
4239 	if (err < 0)
4240 		return err;
4241 
4242 	ndm = nlmsg_data(nlh);
4243 	if (ndm->ndm_ifindex == 0) {
4244 		NL_SET_ERR_MSG(extack, "invalid ifindex");
4245 		return -EINVAL;
4246 	}
4247 
4248 	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4249 	if (dev == NULL) {
4250 		NL_SET_ERR_MSG(extack, "unknown ifindex");
4251 		return -ENODEV;
4252 	}
4253 
4254 	if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4255 		NL_SET_ERR_MSG(extack, "invalid address");
4256 		return -EINVAL;
4257 	}
4258 
4259 	if (dev->type != ARPHRD_ETHER) {
4260 		NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
4261 		return -EINVAL;
4262 	}
4263 
4264 	addr = nla_data(tb[NDA_LLADDR]);
4265 
4266 	err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4267 	if (err)
4268 		return err;
4269 
4270 	err = -EOPNOTSUPP;
4271 
4272 	/* Support fdb on master device the net/bridge default case */
4273 	if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4274 	    netif_is_bridge_port(dev)) {
4275 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4276 		const struct net_device_ops *ops = br_dev->netdev_ops;
4277 
4278 		err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
4279 				       nlh->nlmsg_flags, extack);
4280 		if (err)
4281 			goto out;
4282 		else
4283 			ndm->ndm_flags &= ~NTF_MASTER;
4284 	}
4285 
4286 	/* Embedded bridge, macvlan, and any other device support */
4287 	if ((ndm->ndm_flags & NTF_SELF)) {
4288 		if (dev->netdev_ops->ndo_fdb_add)
4289 			err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
4290 							   vid,
4291 							   nlh->nlmsg_flags,
4292 							   extack);
4293 		else
4294 			err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
4295 					       nlh->nlmsg_flags);
4296 
4297 		if (!err) {
4298 			rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
4299 					ndm->ndm_state);
4300 			ndm->ndm_flags &= ~NTF_SELF;
4301 		}
4302 	}
4303 out:
4304 	return err;
4305 }
4306 
4307 /*
4308  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
4309  */
ndo_dflt_fdb_del(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid)4310 int ndo_dflt_fdb_del(struct ndmsg *ndm,
4311 		     struct nlattr *tb[],
4312 		     struct net_device *dev,
4313 		     const unsigned char *addr, u16 vid)
4314 {
4315 	int err = -EINVAL;
4316 
4317 	/* If aging addresses are supported device will need to
4318 	 * implement its own handler for this.
4319 	 */
4320 	if (!(ndm->ndm_state & NUD_PERMANENT)) {
4321 		netdev_info(dev, "default FDB implementation only supports local addresses\n");
4322 		return err;
4323 	}
4324 
4325 	if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
4326 		err = dev_uc_del(dev, addr);
4327 	else if (is_multicast_ether_addr(addr))
4328 		err = dev_mc_del(dev, addr);
4329 
4330 	return err;
4331 }
4332 EXPORT_SYMBOL(ndo_dflt_fdb_del);
4333 
4334 static const struct nla_policy fdb_del_bulk_policy[NDA_MAX + 1] = {
4335 	[NDA_VLAN]	= { .type = NLA_U16 },
4336 	[NDA_IFINDEX]	= NLA_POLICY_MIN(NLA_S32, 1),
4337 	[NDA_NDM_STATE_MASK]	= { .type = NLA_U16  },
4338 	[NDA_NDM_FLAGS_MASK]	= { .type = NLA_U8 },
4339 };
4340 
rtnl_fdb_del(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4341 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
4342 			struct netlink_ext_ack *extack)
4343 {
4344 	bool del_bulk = !!(nlh->nlmsg_flags & NLM_F_BULK);
4345 	struct net *net = sock_net(skb->sk);
4346 	const struct net_device_ops *ops;
4347 	struct ndmsg *ndm;
4348 	struct nlattr *tb[NDA_MAX+1];
4349 	struct net_device *dev;
4350 	__u8 *addr = NULL;
4351 	int err;
4352 	u16 vid;
4353 
4354 	if (!netlink_capable(skb, CAP_NET_ADMIN))
4355 		return -EPERM;
4356 
4357 	if (!del_bulk) {
4358 		err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX,
4359 					     NULL, extack);
4360 	} else {
4361 		err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX,
4362 				  fdb_del_bulk_policy, extack);
4363 	}
4364 	if (err < 0)
4365 		return err;
4366 
4367 	ndm = nlmsg_data(nlh);
4368 	if (ndm->ndm_ifindex == 0) {
4369 		NL_SET_ERR_MSG(extack, "invalid ifindex");
4370 		return -EINVAL;
4371 	}
4372 
4373 	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4374 	if (dev == NULL) {
4375 		NL_SET_ERR_MSG(extack, "unknown ifindex");
4376 		return -ENODEV;
4377 	}
4378 
4379 	if (!del_bulk) {
4380 		if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4381 			NL_SET_ERR_MSG(extack, "invalid address");
4382 			return -EINVAL;
4383 		}
4384 		addr = nla_data(tb[NDA_LLADDR]);
4385 	}
4386 
4387 	if (dev->type != ARPHRD_ETHER) {
4388 		NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
4389 		return -EINVAL;
4390 	}
4391 
4392 	err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4393 	if (err)
4394 		return err;
4395 
4396 	err = -EOPNOTSUPP;
4397 
4398 	/* Support fdb on master device the net/bridge default case */
4399 	if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4400 	    netif_is_bridge_port(dev)) {
4401 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4402 
4403 		ops = br_dev->netdev_ops;
4404 		if (!del_bulk) {
4405 			if (ops->ndo_fdb_del)
4406 				err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid, extack);
4407 		} else {
4408 			if (ops->ndo_fdb_del_bulk)
4409 				err = ops->ndo_fdb_del_bulk(ndm, tb, dev, vid,
4410 							    extack);
4411 		}
4412 
4413 		if (err)
4414 			goto out;
4415 		else
4416 			ndm->ndm_flags &= ~NTF_MASTER;
4417 	}
4418 
4419 	/* Embedded bridge, macvlan, and any other device support */
4420 	if (ndm->ndm_flags & NTF_SELF) {
4421 		ops = dev->netdev_ops;
4422 		if (!del_bulk) {
4423 			if (ops->ndo_fdb_del)
4424 				err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid, extack);
4425 			else
4426 				err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
4427 		} else {
4428 			/* in case err was cleared by NTF_MASTER call */
4429 			err = -EOPNOTSUPP;
4430 			if (ops->ndo_fdb_del_bulk)
4431 				err = ops->ndo_fdb_del_bulk(ndm, tb, dev, vid,
4432 							    extack);
4433 		}
4434 
4435 		if (!err) {
4436 			if (!del_bulk)
4437 				rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
4438 						ndm->ndm_state);
4439 			ndm->ndm_flags &= ~NTF_SELF;
4440 		}
4441 	}
4442 out:
4443 	return err;
4444 }
4445 
nlmsg_populate_fdb(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev,int * idx,struct netdev_hw_addr_list * list)4446 static int nlmsg_populate_fdb(struct sk_buff *skb,
4447 			      struct netlink_callback *cb,
4448 			      struct net_device *dev,
4449 			      int *idx,
4450 			      struct netdev_hw_addr_list *list)
4451 {
4452 	struct netdev_hw_addr *ha;
4453 	int err;
4454 	u32 portid, seq;
4455 
4456 	portid = NETLINK_CB(cb->skb).portid;
4457 	seq = cb->nlh->nlmsg_seq;
4458 
4459 	list_for_each_entry(ha, &list->list, list) {
4460 		if (*idx < cb->args[2])
4461 			goto skip;
4462 
4463 		err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
4464 					      portid, seq,
4465 					      RTM_NEWNEIGH, NTF_SELF,
4466 					      NLM_F_MULTI, NUD_PERMANENT);
4467 		if (err < 0)
4468 			return err;
4469 skip:
4470 		*idx += 1;
4471 	}
4472 	return 0;
4473 }
4474 
4475 /**
4476  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
4477  * @skb: socket buffer to store message in
4478  * @cb: netlink callback
4479  * @dev: netdevice
4480  * @filter_dev: ignored
4481  * @idx: the number of FDB table entries dumped is added to *@idx
4482  *
4483  * Default netdevice operation to dump the existing unicast address list.
4484  * Returns number of addresses from list put in skb.
4485  */
ndo_dflt_fdb_dump(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev,struct net_device * filter_dev,int * idx)4486 int ndo_dflt_fdb_dump(struct sk_buff *skb,
4487 		      struct netlink_callback *cb,
4488 		      struct net_device *dev,
4489 		      struct net_device *filter_dev,
4490 		      int *idx)
4491 {
4492 	int err;
4493 
4494 	if (dev->type != ARPHRD_ETHER)
4495 		return -EINVAL;
4496 
4497 	netif_addr_lock_bh(dev);
4498 	err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
4499 	if (err)
4500 		goto out;
4501 	err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
4502 out:
4503 	netif_addr_unlock_bh(dev);
4504 	return err;
4505 }
4506 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
4507 
valid_fdb_dump_strict(const struct nlmsghdr * nlh,int * br_idx,int * brport_idx,struct netlink_ext_ack * extack)4508 static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
4509 				 int *br_idx, int *brport_idx,
4510 				 struct netlink_ext_ack *extack)
4511 {
4512 	struct nlattr *tb[NDA_MAX + 1];
4513 	struct ndmsg *ndm;
4514 	int err, i;
4515 
4516 	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4517 		NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
4518 		return -EINVAL;
4519 	}
4520 
4521 	ndm = nlmsg_data(nlh);
4522 	if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4523 	    ndm->ndm_flags || ndm->ndm_type) {
4524 		NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
4525 		return -EINVAL;
4526 	}
4527 
4528 	err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4529 					    NDA_MAX, NULL, extack);
4530 	if (err < 0)
4531 		return err;
4532 
4533 	*brport_idx = ndm->ndm_ifindex;
4534 	for (i = 0; i <= NDA_MAX; ++i) {
4535 		if (!tb[i])
4536 			continue;
4537 
4538 		switch (i) {
4539 		case NDA_IFINDEX:
4540 			if (nla_len(tb[i]) != sizeof(u32)) {
4541 				NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
4542 				return -EINVAL;
4543 			}
4544 			*brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
4545 			break;
4546 		case NDA_MASTER:
4547 			if (nla_len(tb[i]) != sizeof(u32)) {
4548 				NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
4549 				return -EINVAL;
4550 			}
4551 			*br_idx = nla_get_u32(tb[NDA_MASTER]);
4552 			break;
4553 		default:
4554 			NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
4555 			return -EINVAL;
4556 		}
4557 	}
4558 
4559 	return 0;
4560 }
4561 
valid_fdb_dump_legacy(const struct nlmsghdr * nlh,int * br_idx,int * brport_idx,struct netlink_ext_ack * extack)4562 static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
4563 				 int *br_idx, int *brport_idx,
4564 				 struct netlink_ext_ack *extack)
4565 {
4566 	struct nlattr *tb[IFLA_MAX+1];
4567 	int err;
4568 
4569 	/* A hack to preserve kernel<->userspace interface.
4570 	 * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
4571 	 * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
4572 	 * So, check for ndmsg with an optional u32 attribute (not used here).
4573 	 * Fortunately these sizes don't conflict with the size of ifinfomsg
4574 	 * with an optional attribute.
4575 	 */
4576 	if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
4577 	    (nlmsg_len(nlh) != sizeof(struct ndmsg) +
4578 	     nla_attr_size(sizeof(u32)))) {
4579 		struct ifinfomsg *ifm;
4580 
4581 		err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4582 					     tb, IFLA_MAX, ifla_policy,
4583 					     extack);
4584 		if (err < 0) {
4585 			return -EINVAL;
4586 		} else if (err == 0) {
4587 			if (tb[IFLA_MASTER])
4588 				*br_idx = nla_get_u32(tb[IFLA_MASTER]);
4589 		}
4590 
4591 		ifm = nlmsg_data(nlh);
4592 		*brport_idx = ifm->ifi_index;
4593 	}
4594 	return 0;
4595 }
4596 
rtnl_fdb_dump(struct sk_buff * skb,struct netlink_callback * cb)4597 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
4598 {
4599 	struct net_device *dev;
4600 	struct net_device *br_dev = NULL;
4601 	const struct net_device_ops *ops = NULL;
4602 	const struct net_device_ops *cops = NULL;
4603 	struct net *net = sock_net(skb->sk);
4604 	struct hlist_head *head;
4605 	int brport_idx = 0;
4606 	int br_idx = 0;
4607 	int h, s_h;
4608 	int idx = 0, s_idx;
4609 	int err = 0;
4610 	int fidx = 0;
4611 
4612 	if (cb->strict_check)
4613 		err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4614 					    cb->extack);
4615 	else
4616 		err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4617 					    cb->extack);
4618 	if (err < 0)
4619 		return err;
4620 
4621 	if (br_idx) {
4622 		br_dev = __dev_get_by_index(net, br_idx);
4623 		if (!br_dev)
4624 			return -ENODEV;
4625 
4626 		ops = br_dev->netdev_ops;
4627 	}
4628 
4629 	s_h = cb->args[0];
4630 	s_idx = cb->args[1];
4631 
4632 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4633 		idx = 0;
4634 		head = &net->dev_index_head[h];
4635 		hlist_for_each_entry(dev, head, index_hlist) {
4636 
4637 			if (brport_idx && (dev->ifindex != brport_idx))
4638 				continue;
4639 
4640 			if (!br_idx) { /* user did not specify a specific bridge */
4641 				if (netif_is_bridge_port(dev)) {
4642 					br_dev = netdev_master_upper_dev_get(dev);
4643 					cops = br_dev->netdev_ops;
4644 				}
4645 			} else {
4646 				if (dev != br_dev &&
4647 				    !netif_is_bridge_port(dev))
4648 					continue;
4649 
4650 				if (br_dev != netdev_master_upper_dev_get(dev) &&
4651 				    !netif_is_bridge_master(dev))
4652 					continue;
4653 				cops = ops;
4654 			}
4655 
4656 			if (idx < s_idx)
4657 				goto cont;
4658 
4659 			if (netif_is_bridge_port(dev)) {
4660 				if (cops && cops->ndo_fdb_dump) {
4661 					err = cops->ndo_fdb_dump(skb, cb,
4662 								br_dev, dev,
4663 								&fidx);
4664 					if (err == -EMSGSIZE)
4665 						goto out;
4666 				}
4667 			}
4668 
4669 			if (dev->netdev_ops->ndo_fdb_dump)
4670 				err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4671 								    dev, NULL,
4672 								    &fidx);
4673 			else
4674 				err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4675 							&fidx);
4676 			if (err == -EMSGSIZE)
4677 				goto out;
4678 
4679 			cops = NULL;
4680 
4681 			/* reset fdb offset to 0 for rest of the interfaces */
4682 			cb->args[2] = 0;
4683 			fidx = 0;
4684 cont:
4685 			idx++;
4686 		}
4687 	}
4688 
4689 out:
4690 	cb->args[0] = h;
4691 	cb->args[1] = idx;
4692 	cb->args[2] = fidx;
4693 
4694 	return skb->len;
4695 }
4696 
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)4697 static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4698 				struct nlattr **tb, u8 *ndm_flags,
4699 				int *br_idx, int *brport_idx, u8 **addr,
4700 				u16 *vid, struct netlink_ext_ack *extack)
4701 {
4702 	struct ndmsg *ndm;
4703 	int err, i;
4704 
4705 	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4706 		NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4707 		return -EINVAL;
4708 	}
4709 
4710 	ndm = nlmsg_data(nlh);
4711 	if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4712 	    ndm->ndm_type) {
4713 		NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4714 		return -EINVAL;
4715 	}
4716 
4717 	if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4718 		NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4719 		return -EINVAL;
4720 	}
4721 
4722 	err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4723 					    NDA_MAX, nda_policy, extack);
4724 	if (err < 0)
4725 		return err;
4726 
4727 	*ndm_flags = ndm->ndm_flags;
4728 	*brport_idx = ndm->ndm_ifindex;
4729 	for (i = 0; i <= NDA_MAX; ++i) {
4730 		if (!tb[i])
4731 			continue;
4732 
4733 		switch (i) {
4734 		case NDA_MASTER:
4735 			*br_idx = nla_get_u32(tb[i]);
4736 			break;
4737 		case NDA_LLADDR:
4738 			if (nla_len(tb[i]) != ETH_ALEN) {
4739 				NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4740 				return -EINVAL;
4741 			}
4742 			*addr = nla_data(tb[i]);
4743 			break;
4744 		case NDA_VLAN:
4745 			err = fdb_vid_parse(tb[i], vid, extack);
4746 			if (err)
4747 				return err;
4748 			break;
4749 		case NDA_VNI:
4750 			break;
4751 		default:
4752 			NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4753 			return -EINVAL;
4754 		}
4755 	}
4756 
4757 	return 0;
4758 }
4759 
rtnl_fdb_get(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4760 static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4761 			struct netlink_ext_ack *extack)
4762 {
4763 	struct net_device *dev = NULL, *br_dev = NULL;
4764 	const struct net_device_ops *ops = NULL;
4765 	struct net *net = sock_net(in_skb->sk);
4766 	struct nlattr *tb[NDA_MAX + 1];
4767 	struct sk_buff *skb;
4768 	int brport_idx = 0;
4769 	u8 ndm_flags = 0;
4770 	int br_idx = 0;
4771 	u8 *addr = NULL;
4772 	u16 vid = 0;
4773 	int err;
4774 
4775 	err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4776 				   &brport_idx, &addr, &vid, extack);
4777 	if (err < 0)
4778 		return err;
4779 
4780 	if (!addr) {
4781 		NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4782 		return -EINVAL;
4783 	}
4784 
4785 	if (brport_idx) {
4786 		dev = __dev_get_by_index(net, brport_idx);
4787 		if (!dev) {
4788 			NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4789 			return -ENODEV;
4790 		}
4791 	}
4792 
4793 	if (br_idx) {
4794 		if (dev) {
4795 			NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4796 			return -EINVAL;
4797 		}
4798 
4799 		br_dev = __dev_get_by_index(net, br_idx);
4800 		if (!br_dev) {
4801 			NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4802 			return -EINVAL;
4803 		}
4804 		ops = br_dev->netdev_ops;
4805 	}
4806 
4807 	if (dev) {
4808 		if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4809 			if (!netif_is_bridge_port(dev)) {
4810 				NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4811 				return -EINVAL;
4812 			}
4813 			br_dev = netdev_master_upper_dev_get(dev);
4814 			if (!br_dev) {
4815 				NL_SET_ERR_MSG(extack, "Master of device not found");
4816 				return -EINVAL;
4817 			}
4818 			ops = br_dev->netdev_ops;
4819 		} else {
4820 			if (!(ndm_flags & NTF_SELF)) {
4821 				NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4822 				return -EINVAL;
4823 			}
4824 			ops = dev->netdev_ops;
4825 		}
4826 	}
4827 
4828 	if (!br_dev && !dev) {
4829 		NL_SET_ERR_MSG(extack, "No device specified");
4830 		return -ENODEV;
4831 	}
4832 
4833 	if (!ops || !ops->ndo_fdb_get) {
4834 		NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4835 		return -EOPNOTSUPP;
4836 	}
4837 
4838 	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4839 	if (!skb)
4840 		return -ENOBUFS;
4841 
4842 	if (br_dev)
4843 		dev = br_dev;
4844 	err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4845 			       NETLINK_CB(in_skb).portid,
4846 			       nlh->nlmsg_seq, extack);
4847 	if (err)
4848 		goto out;
4849 
4850 	return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4851 out:
4852 	kfree_skb(skb);
4853 	return err;
4854 }
4855 
brport_nla_put_flag(struct sk_buff * skb,u32 flags,u32 mask,unsigned int attrnum,unsigned int flag)4856 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4857 			       unsigned int attrnum, unsigned int flag)
4858 {
4859 	if (mask & flag)
4860 		return nla_put_u8(skb, attrnum, !!(flags & flag));
4861 	return 0;
4862 }
4863 
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))4864 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4865 			    struct net_device *dev, u16 mode,
4866 			    u32 flags, u32 mask, int nlflags,
4867 			    u32 filter_mask,
4868 			    int (*vlan_fill)(struct sk_buff *skb,
4869 					     struct net_device *dev,
4870 					     u32 filter_mask))
4871 {
4872 	struct nlmsghdr *nlh;
4873 	struct ifinfomsg *ifm;
4874 	struct nlattr *br_afspec;
4875 	struct nlattr *protinfo;
4876 	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4877 	struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4878 	int err = 0;
4879 
4880 	nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4881 	if (nlh == NULL)
4882 		return -EMSGSIZE;
4883 
4884 	ifm = nlmsg_data(nlh);
4885 	ifm->ifi_family = AF_BRIDGE;
4886 	ifm->__ifi_pad = 0;
4887 	ifm->ifi_type = dev->type;
4888 	ifm->ifi_index = dev->ifindex;
4889 	ifm->ifi_flags = dev_get_flags(dev);
4890 	ifm->ifi_change = 0;
4891 
4892 
4893 	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4894 	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4895 	    nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4896 	    (br_dev &&
4897 	     nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4898 	    (dev->addr_len &&
4899 	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4900 	    (dev->ifindex != dev_get_iflink(dev) &&
4901 	     nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4902 		goto nla_put_failure;
4903 
4904 	br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4905 	if (!br_afspec)
4906 		goto nla_put_failure;
4907 
4908 	if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4909 		nla_nest_cancel(skb, br_afspec);
4910 		goto nla_put_failure;
4911 	}
4912 
4913 	if (mode != BRIDGE_MODE_UNDEF) {
4914 		if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4915 			nla_nest_cancel(skb, br_afspec);
4916 			goto nla_put_failure;
4917 		}
4918 	}
4919 	if (vlan_fill) {
4920 		err = vlan_fill(skb, dev, filter_mask);
4921 		if (err) {
4922 			nla_nest_cancel(skb, br_afspec);
4923 			goto nla_put_failure;
4924 		}
4925 	}
4926 	nla_nest_end(skb, br_afspec);
4927 
4928 	protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4929 	if (!protinfo)
4930 		goto nla_put_failure;
4931 
4932 	if (brport_nla_put_flag(skb, flags, mask,
4933 				IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4934 	    brport_nla_put_flag(skb, flags, mask,
4935 				IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4936 	    brport_nla_put_flag(skb, flags, mask,
4937 				IFLA_BRPORT_FAST_LEAVE,
4938 				BR_MULTICAST_FAST_LEAVE) ||
4939 	    brport_nla_put_flag(skb, flags, mask,
4940 				IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4941 	    brport_nla_put_flag(skb, flags, mask,
4942 				IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4943 	    brport_nla_put_flag(skb, flags, mask,
4944 				IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4945 	    brport_nla_put_flag(skb, flags, mask,
4946 				IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4947 	    brport_nla_put_flag(skb, flags, mask,
4948 				IFLA_BRPORT_PROXYARP, BR_PROXYARP) ||
4949 	    brport_nla_put_flag(skb, flags, mask,
4950 				IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) ||
4951 	    brport_nla_put_flag(skb, flags, mask,
4952 				IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) {
4953 		nla_nest_cancel(skb, protinfo);
4954 		goto nla_put_failure;
4955 	}
4956 
4957 	nla_nest_end(skb, protinfo);
4958 
4959 	nlmsg_end(skb, nlh);
4960 	return 0;
4961 nla_put_failure:
4962 	nlmsg_cancel(skb, nlh);
4963 	return err ? err : -EMSGSIZE;
4964 }
4965 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4966 
valid_bridge_getlink_req(const struct nlmsghdr * nlh,bool strict_check,u32 * filter_mask,struct netlink_ext_ack * extack)4967 static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4968 				    bool strict_check, u32 *filter_mask,
4969 				    struct netlink_ext_ack *extack)
4970 {
4971 	struct nlattr *tb[IFLA_MAX+1];
4972 	int err, i;
4973 
4974 	if (strict_check) {
4975 		struct ifinfomsg *ifm;
4976 
4977 		if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4978 			NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4979 			return -EINVAL;
4980 		}
4981 
4982 		ifm = nlmsg_data(nlh);
4983 		if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4984 		    ifm->ifi_change || ifm->ifi_index) {
4985 			NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4986 			return -EINVAL;
4987 		}
4988 
4989 		err = nlmsg_parse_deprecated_strict(nlh,
4990 						    sizeof(struct ifinfomsg),
4991 						    tb, IFLA_MAX, ifla_policy,
4992 						    extack);
4993 	} else {
4994 		err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4995 					     tb, IFLA_MAX, ifla_policy,
4996 					     extack);
4997 	}
4998 	if (err < 0)
4999 		return err;
5000 
5001 	/* new attributes should only be added with strict checking */
5002 	for (i = 0; i <= IFLA_MAX; ++i) {
5003 		if (!tb[i])
5004 			continue;
5005 
5006 		switch (i) {
5007 		case IFLA_EXT_MASK:
5008 			*filter_mask = nla_get_u32(tb[i]);
5009 			break;
5010 		default:
5011 			if (strict_check) {
5012 				NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
5013 				return -EINVAL;
5014 			}
5015 		}
5016 	}
5017 
5018 	return 0;
5019 }
5020 
rtnl_bridge_getlink(struct sk_buff * skb,struct netlink_callback * cb)5021 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
5022 {
5023 	const struct nlmsghdr *nlh = cb->nlh;
5024 	struct net *net = sock_net(skb->sk);
5025 	struct net_device *dev;
5026 	int idx = 0;
5027 	u32 portid = NETLINK_CB(cb->skb).portid;
5028 	u32 seq = nlh->nlmsg_seq;
5029 	u32 filter_mask = 0;
5030 	int err;
5031 
5032 	err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
5033 				       cb->extack);
5034 	if (err < 0 && cb->strict_check)
5035 		return err;
5036 
5037 	rcu_read_lock();
5038 	for_each_netdev_rcu(net, dev) {
5039 		const struct net_device_ops *ops = dev->netdev_ops;
5040 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
5041 
5042 		if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
5043 			if (idx >= cb->args[0]) {
5044 				err = br_dev->netdev_ops->ndo_bridge_getlink(
5045 						skb, portid, seq, dev,
5046 						filter_mask, NLM_F_MULTI);
5047 				if (err < 0 && err != -EOPNOTSUPP) {
5048 					if (likely(skb->len))
5049 						break;
5050 
5051 					goto out_err;
5052 				}
5053 			}
5054 			idx++;
5055 		}
5056 
5057 		if (ops->ndo_bridge_getlink) {
5058 			if (idx >= cb->args[0]) {
5059 				err = ops->ndo_bridge_getlink(skb, portid,
5060 							      seq, dev,
5061 							      filter_mask,
5062 							      NLM_F_MULTI);
5063 				if (err < 0 && err != -EOPNOTSUPP) {
5064 					if (likely(skb->len))
5065 						break;
5066 
5067 					goto out_err;
5068 				}
5069 			}
5070 			idx++;
5071 		}
5072 	}
5073 	err = skb->len;
5074 out_err:
5075 	rcu_read_unlock();
5076 	cb->args[0] = idx;
5077 
5078 	return err;
5079 }
5080 
bridge_nlmsg_size(void)5081 static inline size_t bridge_nlmsg_size(void)
5082 {
5083 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5084 		+ nla_total_size(IFNAMSIZ)	/* IFLA_IFNAME */
5085 		+ nla_total_size(MAX_ADDR_LEN)	/* IFLA_ADDRESS */
5086 		+ nla_total_size(sizeof(u32))	/* IFLA_MASTER */
5087 		+ nla_total_size(sizeof(u32))	/* IFLA_MTU */
5088 		+ nla_total_size(sizeof(u32))	/* IFLA_LINK */
5089 		+ nla_total_size(sizeof(u32))	/* IFLA_OPERSTATE */
5090 		+ nla_total_size(sizeof(u8))	/* IFLA_PROTINFO */
5091 		+ nla_total_size(sizeof(struct nlattr))	/* IFLA_AF_SPEC */
5092 		+ nla_total_size(sizeof(u16))	/* IFLA_BRIDGE_FLAGS */
5093 		+ nla_total_size(sizeof(u16));	/* IFLA_BRIDGE_MODE */
5094 }
5095 
rtnl_bridge_notify(struct net_device * dev)5096 static int rtnl_bridge_notify(struct net_device *dev)
5097 {
5098 	struct net *net = dev_net(dev);
5099 	struct sk_buff *skb;
5100 	int err = -EOPNOTSUPP;
5101 
5102 	if (!dev->netdev_ops->ndo_bridge_getlink)
5103 		return 0;
5104 
5105 	skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
5106 	if (!skb) {
5107 		err = -ENOMEM;
5108 		goto errout;
5109 	}
5110 
5111 	err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
5112 	if (err < 0)
5113 		goto errout;
5114 
5115 	/* Notification info is only filled for bridge ports, not the bridge
5116 	 * device itself. Therefore, a zero notification length is valid and
5117 	 * should not result in an error.
5118 	 */
5119 	if (!skb->len)
5120 		goto errout;
5121 
5122 	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
5123 	return 0;
5124 errout:
5125 	WARN_ON(err == -EMSGSIZE);
5126 	kfree_skb(skb);
5127 	if (err)
5128 		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
5129 	return err;
5130 }
5131 
rtnl_bridge_setlink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5132 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
5133 			       struct netlink_ext_ack *extack)
5134 {
5135 	struct net *net = sock_net(skb->sk);
5136 	struct ifinfomsg *ifm;
5137 	struct net_device *dev;
5138 	struct nlattr *br_spec, *attr, *br_flags_attr = NULL;
5139 	int rem, err = -EOPNOTSUPP;
5140 	u16 flags = 0;
5141 
5142 	if (nlmsg_len(nlh) < sizeof(*ifm))
5143 		return -EINVAL;
5144 
5145 	ifm = nlmsg_data(nlh);
5146 	if (ifm->ifi_family != AF_BRIDGE)
5147 		return -EPFNOSUPPORT;
5148 
5149 	dev = __dev_get_by_index(net, ifm->ifi_index);
5150 	if (!dev) {
5151 		NL_SET_ERR_MSG(extack, "unknown ifindex");
5152 		return -ENODEV;
5153 	}
5154 
5155 	br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
5156 	if (br_spec) {
5157 		nla_for_each_nested(attr, br_spec, rem) {
5158 			if (nla_type(attr) == IFLA_BRIDGE_FLAGS && !br_flags_attr) {
5159 				if (nla_len(attr) < sizeof(flags))
5160 					return -EINVAL;
5161 
5162 				br_flags_attr = attr;
5163 				flags = nla_get_u16(attr);
5164 			}
5165 
5166 			if (nla_type(attr) == IFLA_BRIDGE_MODE) {
5167 				if (nla_len(attr) < sizeof(u16))
5168 					return -EINVAL;
5169 			}
5170 		}
5171 	}
5172 
5173 	if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
5174 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
5175 
5176 		if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
5177 			err = -EOPNOTSUPP;
5178 			goto out;
5179 		}
5180 
5181 		err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
5182 							     extack);
5183 		if (err)
5184 			goto out;
5185 
5186 		flags &= ~BRIDGE_FLAGS_MASTER;
5187 	}
5188 
5189 	if ((flags & BRIDGE_FLAGS_SELF)) {
5190 		if (!dev->netdev_ops->ndo_bridge_setlink)
5191 			err = -EOPNOTSUPP;
5192 		else
5193 			err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
5194 								  flags,
5195 								  extack);
5196 		if (!err) {
5197 			flags &= ~BRIDGE_FLAGS_SELF;
5198 
5199 			/* Generate event to notify upper layer of bridge
5200 			 * change
5201 			 */
5202 			err = rtnl_bridge_notify(dev);
5203 		}
5204 	}
5205 
5206 	if (br_flags_attr)
5207 		memcpy(nla_data(br_flags_attr), &flags, sizeof(flags));
5208 out:
5209 	return err;
5210 }
5211 
rtnl_bridge_dellink(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5212 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
5213 			       struct netlink_ext_ack *extack)
5214 {
5215 	struct net *net = sock_net(skb->sk);
5216 	struct ifinfomsg *ifm;
5217 	struct net_device *dev;
5218 	struct nlattr *br_spec, *attr = NULL;
5219 	int rem, err = -EOPNOTSUPP;
5220 	u16 flags = 0;
5221 	bool have_flags = false;
5222 
5223 	if (nlmsg_len(nlh) < sizeof(*ifm))
5224 		return -EINVAL;
5225 
5226 	ifm = nlmsg_data(nlh);
5227 	if (ifm->ifi_family != AF_BRIDGE)
5228 		return -EPFNOSUPPORT;
5229 
5230 	dev = __dev_get_by_index(net, ifm->ifi_index);
5231 	if (!dev) {
5232 		NL_SET_ERR_MSG(extack, "unknown ifindex");
5233 		return -ENODEV;
5234 	}
5235 
5236 	br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
5237 	if (br_spec) {
5238 		nla_for_each_nested(attr, br_spec, rem) {
5239 			if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
5240 				if (nla_len(attr) < sizeof(flags))
5241 					return -EINVAL;
5242 
5243 				have_flags = true;
5244 				flags = nla_get_u16(attr);
5245 				break;
5246 			}
5247 		}
5248 	}
5249 
5250 	if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
5251 		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
5252 
5253 		if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
5254 			err = -EOPNOTSUPP;
5255 			goto out;
5256 		}
5257 
5258 		err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
5259 		if (err)
5260 			goto out;
5261 
5262 		flags &= ~BRIDGE_FLAGS_MASTER;
5263 	}
5264 
5265 	if ((flags & BRIDGE_FLAGS_SELF)) {
5266 		if (!dev->netdev_ops->ndo_bridge_dellink)
5267 			err = -EOPNOTSUPP;
5268 		else
5269 			err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
5270 								  flags);
5271 
5272 		if (!err) {
5273 			flags &= ~BRIDGE_FLAGS_SELF;
5274 
5275 			/* Generate event to notify upper layer of bridge
5276 			 * change
5277 			 */
5278 			err = rtnl_bridge_notify(dev);
5279 		}
5280 	}
5281 
5282 	if (have_flags)
5283 		memcpy(nla_data(attr), &flags, sizeof(flags));
5284 out:
5285 	return err;
5286 }
5287 
stats_attr_valid(unsigned int mask,int attrid,int idxattr)5288 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
5289 {
5290 	return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
5291 	       (!idxattr || idxattr == attrid);
5292 }
5293 
5294 static bool
rtnl_offload_xstats_have_ndo(const struct net_device * dev,int attr_id)5295 rtnl_offload_xstats_have_ndo(const struct net_device *dev, int attr_id)
5296 {
5297 	return dev->netdev_ops &&
5298 	       dev->netdev_ops->ndo_has_offload_stats &&
5299 	       dev->netdev_ops->ndo_get_offload_stats &&
5300 	       dev->netdev_ops->ndo_has_offload_stats(dev, attr_id);
5301 }
5302 
5303 static unsigned int
rtnl_offload_xstats_get_size_ndo(const struct net_device * dev,int attr_id)5304 rtnl_offload_xstats_get_size_ndo(const struct net_device *dev, int attr_id)
5305 {
5306 	return rtnl_offload_xstats_have_ndo(dev, attr_id) ?
5307 	       sizeof(struct rtnl_link_stats64) : 0;
5308 }
5309 
5310 static int
rtnl_offload_xstats_fill_ndo(struct net_device * dev,int attr_id,struct sk_buff * skb)5311 rtnl_offload_xstats_fill_ndo(struct net_device *dev, int attr_id,
5312 			     struct sk_buff *skb)
5313 {
5314 	unsigned int size = rtnl_offload_xstats_get_size_ndo(dev, attr_id);
5315 	struct nlattr *attr = NULL;
5316 	void *attr_data;
5317 	int err;
5318 
5319 	if (!size)
5320 		return -ENODATA;
5321 
5322 	attr = nla_reserve_64bit(skb, attr_id, size,
5323 				 IFLA_OFFLOAD_XSTATS_UNSPEC);
5324 	if (!attr)
5325 		return -EMSGSIZE;
5326 
5327 	attr_data = nla_data(attr);
5328 	memset(attr_data, 0, size);
5329 
5330 	err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev, attr_data);
5331 	if (err)
5332 		return err;
5333 
5334 	return 0;
5335 }
5336 
5337 static unsigned int
rtnl_offload_xstats_get_size_stats(const struct net_device * dev,enum netdev_offload_xstats_type type)5338 rtnl_offload_xstats_get_size_stats(const struct net_device *dev,
5339 				   enum netdev_offload_xstats_type type)
5340 {
5341 	bool enabled = netdev_offload_xstats_enabled(dev, type);
5342 
5343 	return enabled ? sizeof(struct rtnl_hw_stats64) : 0;
5344 }
5345 
5346 struct rtnl_offload_xstats_request_used {
5347 	bool request;
5348 	bool used;
5349 };
5350 
5351 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)5352 rtnl_offload_xstats_get_stats(struct net_device *dev,
5353 			      enum netdev_offload_xstats_type type,
5354 			      struct rtnl_offload_xstats_request_used *ru,
5355 			      struct rtnl_hw_stats64 *stats,
5356 			      struct netlink_ext_ack *extack)
5357 {
5358 	bool request;
5359 	bool used;
5360 	int err;
5361 
5362 	request = netdev_offload_xstats_enabled(dev, type);
5363 	if (!request) {
5364 		used = false;
5365 		goto out;
5366 	}
5367 
5368 	err = netdev_offload_xstats_get(dev, type, stats, &used, extack);
5369 	if (err)
5370 		return err;
5371 
5372 out:
5373 	if (ru) {
5374 		ru->request = request;
5375 		ru->used = used;
5376 	}
5377 	return 0;
5378 }
5379 
5380 static int
rtnl_offload_xstats_fill_hw_s_info_one(struct sk_buff * skb,int attr_id,struct rtnl_offload_xstats_request_used * ru)5381 rtnl_offload_xstats_fill_hw_s_info_one(struct sk_buff *skb, int attr_id,
5382 				       struct rtnl_offload_xstats_request_used *ru)
5383 {
5384 	struct nlattr *nest;
5385 
5386 	nest = nla_nest_start(skb, attr_id);
5387 	if (!nest)
5388 		return -EMSGSIZE;
5389 
5390 	if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST, ru->request))
5391 		goto nla_put_failure;
5392 
5393 	if (nla_put_u8(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED, ru->used))
5394 		goto nla_put_failure;
5395 
5396 	nla_nest_end(skb, nest);
5397 	return 0;
5398 
5399 nla_put_failure:
5400 	nla_nest_cancel(skb, nest);
5401 	return -EMSGSIZE;
5402 }
5403 
5404 static int
rtnl_offload_xstats_fill_hw_s_info(struct sk_buff * skb,struct net_device * dev,struct netlink_ext_ack * extack)5405 rtnl_offload_xstats_fill_hw_s_info(struct sk_buff *skb, struct net_device *dev,
5406 				   struct netlink_ext_ack *extack)
5407 {
5408 	enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5409 	struct rtnl_offload_xstats_request_used ru_l3;
5410 	struct nlattr *nest;
5411 	int err;
5412 
5413 	err = rtnl_offload_xstats_get_stats(dev, t_l3, &ru_l3, NULL, extack);
5414 	if (err)
5415 		return err;
5416 
5417 	nest = nla_nest_start(skb, IFLA_OFFLOAD_XSTATS_HW_S_INFO);
5418 	if (!nest)
5419 		return -EMSGSIZE;
5420 
5421 	if (rtnl_offload_xstats_fill_hw_s_info_one(skb,
5422 						   IFLA_OFFLOAD_XSTATS_L3_STATS,
5423 						   &ru_l3))
5424 		goto nla_put_failure;
5425 
5426 	nla_nest_end(skb, nest);
5427 	return 0;
5428 
5429 nla_put_failure:
5430 	nla_nest_cancel(skb, nest);
5431 	return -EMSGSIZE;
5432 }
5433 
rtnl_offload_xstats_fill(struct sk_buff * skb,struct net_device * dev,int * prividx,u32 off_filter_mask,struct netlink_ext_ack * extack)5434 static int rtnl_offload_xstats_fill(struct sk_buff *skb, struct net_device *dev,
5435 				    int *prividx, u32 off_filter_mask,
5436 				    struct netlink_ext_ack *extack)
5437 {
5438 	enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5439 	int attr_id_hw_s_info = IFLA_OFFLOAD_XSTATS_HW_S_INFO;
5440 	int attr_id_l3_stats = IFLA_OFFLOAD_XSTATS_L3_STATS;
5441 	int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT;
5442 	bool have_data = false;
5443 	int err;
5444 
5445 	if (*prividx <= attr_id_cpu_hit &&
5446 	    (off_filter_mask &
5447 	     IFLA_STATS_FILTER_BIT(attr_id_cpu_hit))) {
5448 		err = rtnl_offload_xstats_fill_ndo(dev, attr_id_cpu_hit, skb);
5449 		if (!err) {
5450 			have_data = true;
5451 		} else if (err != -ENODATA) {
5452 			*prividx = attr_id_cpu_hit;
5453 			return err;
5454 		}
5455 	}
5456 
5457 	if (*prividx <= attr_id_hw_s_info &&
5458 	    (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_hw_s_info))) {
5459 		*prividx = attr_id_hw_s_info;
5460 
5461 		err = rtnl_offload_xstats_fill_hw_s_info(skb, dev, extack);
5462 		if (err)
5463 			return err;
5464 
5465 		have_data = true;
5466 		*prividx = 0;
5467 	}
5468 
5469 	if (*prividx <= attr_id_l3_stats &&
5470 	    (off_filter_mask & IFLA_STATS_FILTER_BIT(attr_id_l3_stats))) {
5471 		unsigned int size_l3;
5472 		struct nlattr *attr;
5473 
5474 		*prividx = attr_id_l3_stats;
5475 
5476 		size_l3 = rtnl_offload_xstats_get_size_stats(dev, t_l3);
5477 		if (!size_l3)
5478 			goto skip_l3_stats;
5479 		attr = nla_reserve_64bit(skb, attr_id_l3_stats, size_l3,
5480 					 IFLA_OFFLOAD_XSTATS_UNSPEC);
5481 		if (!attr)
5482 			return -EMSGSIZE;
5483 
5484 		err = rtnl_offload_xstats_get_stats(dev, t_l3, NULL,
5485 						    nla_data(attr), extack);
5486 		if (err)
5487 			return err;
5488 
5489 		have_data = true;
5490 skip_l3_stats:
5491 		*prividx = 0;
5492 	}
5493 
5494 	if (!have_data)
5495 		return -ENODATA;
5496 
5497 	*prividx = 0;
5498 	return 0;
5499 }
5500 
5501 static unsigned int
rtnl_offload_xstats_get_size_hw_s_info_one(const struct net_device * dev,enum netdev_offload_xstats_type type)5502 rtnl_offload_xstats_get_size_hw_s_info_one(const struct net_device *dev,
5503 					   enum netdev_offload_xstats_type type)
5504 {
5505 	return nla_total_size(0) +
5506 		/* IFLA_OFFLOAD_XSTATS_HW_S_INFO_REQUEST */
5507 		nla_total_size(sizeof(u8)) +
5508 		/* IFLA_OFFLOAD_XSTATS_HW_S_INFO_USED */
5509 		nla_total_size(sizeof(u8)) +
5510 		0;
5511 }
5512 
5513 static unsigned int
rtnl_offload_xstats_get_size_hw_s_info(const struct net_device * dev)5514 rtnl_offload_xstats_get_size_hw_s_info(const struct net_device *dev)
5515 {
5516 	enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5517 
5518 	return nla_total_size(0) +
5519 		/* IFLA_OFFLOAD_XSTATS_L3_STATS */
5520 		rtnl_offload_xstats_get_size_hw_s_info_one(dev, t_l3) +
5521 		0;
5522 }
5523 
rtnl_offload_xstats_get_size(const struct net_device * dev,u32 off_filter_mask)5524 static int rtnl_offload_xstats_get_size(const struct net_device *dev,
5525 					u32 off_filter_mask)
5526 {
5527 	enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
5528 	int attr_id_cpu_hit = IFLA_OFFLOAD_XSTATS_CPU_HIT;
5529 	int nla_size = 0;
5530 	int size;
5531 
5532 	if (off_filter_mask &
5533 	    IFLA_STATS_FILTER_BIT(attr_id_cpu_hit)) {
5534 		size = rtnl_offload_xstats_get_size_ndo(dev, attr_id_cpu_hit);
5535 		nla_size += nla_total_size_64bit(size);
5536 	}
5537 
5538 	if (off_filter_mask &
5539 	    IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO))
5540 		nla_size += rtnl_offload_xstats_get_size_hw_s_info(dev);
5541 
5542 	if (off_filter_mask &
5543 	    IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_L3_STATS)) {
5544 		size = rtnl_offload_xstats_get_size_stats(dev, t_l3);
5545 		nla_size += nla_total_size_64bit(size);
5546 	}
5547 
5548 	if (nla_size != 0)
5549 		nla_size += nla_total_size(0);
5550 
5551 	return nla_size;
5552 }
5553 
5554 struct rtnl_stats_dump_filters {
5555 	/* mask[0] filters outer attributes. Then individual nests have their
5556 	 * filtering mask at the index of the nested attribute.
5557 	 */
5558 	u32 mask[IFLA_STATS_MAX + 1];
5559 };
5560 
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)5561 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
5562 			       int type, u32 pid, u32 seq, u32 change,
5563 			       unsigned int flags,
5564 			       const struct rtnl_stats_dump_filters *filters,
5565 			       int *idxattr, int *prividx,
5566 			       struct netlink_ext_ack *extack)
5567 {
5568 	unsigned int filter_mask = filters->mask[0];
5569 	struct if_stats_msg *ifsm;
5570 	struct nlmsghdr *nlh;
5571 	struct nlattr *attr;
5572 	int s_prividx = *prividx;
5573 	int err;
5574 
5575 	ASSERT_RTNL();
5576 
5577 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
5578 	if (!nlh)
5579 		return -EMSGSIZE;
5580 
5581 	ifsm = nlmsg_data(nlh);
5582 	ifsm->family = PF_UNSPEC;
5583 	ifsm->pad1 = 0;
5584 	ifsm->pad2 = 0;
5585 	ifsm->ifindex = dev->ifindex;
5586 	ifsm->filter_mask = filter_mask;
5587 
5588 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
5589 		struct rtnl_link_stats64 *sp;
5590 
5591 		attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
5592 					 sizeof(struct rtnl_link_stats64),
5593 					 IFLA_STATS_UNSPEC);
5594 		if (!attr) {
5595 			err = -EMSGSIZE;
5596 			goto nla_put_failure;
5597 		}
5598 
5599 		sp = nla_data(attr);
5600 		dev_get_stats(dev, sp);
5601 	}
5602 
5603 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
5604 		const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5605 
5606 		if (ops && ops->fill_linkxstats) {
5607 			*idxattr = IFLA_STATS_LINK_XSTATS;
5608 			attr = nla_nest_start_noflag(skb,
5609 						     IFLA_STATS_LINK_XSTATS);
5610 			if (!attr) {
5611 				err = -EMSGSIZE;
5612 				goto nla_put_failure;
5613 			}
5614 
5615 			err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5616 			nla_nest_end(skb, attr);
5617 			if (err)
5618 				goto nla_put_failure;
5619 			*idxattr = 0;
5620 		}
5621 	}
5622 
5623 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
5624 			     *idxattr)) {
5625 		const struct rtnl_link_ops *ops = NULL;
5626 		const struct net_device *master;
5627 
5628 		master = netdev_master_upper_dev_get(dev);
5629 		if (master)
5630 			ops = master->rtnl_link_ops;
5631 		if (ops && ops->fill_linkxstats) {
5632 			*idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
5633 			attr = nla_nest_start_noflag(skb,
5634 						     IFLA_STATS_LINK_XSTATS_SLAVE);
5635 			if (!attr) {
5636 				err = -EMSGSIZE;
5637 				goto nla_put_failure;
5638 			}
5639 
5640 			err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5641 			nla_nest_end(skb, attr);
5642 			if (err)
5643 				goto nla_put_failure;
5644 			*idxattr = 0;
5645 		}
5646 	}
5647 
5648 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
5649 			     *idxattr)) {
5650 		u32 off_filter_mask;
5651 
5652 		off_filter_mask = filters->mask[IFLA_STATS_LINK_OFFLOAD_XSTATS];
5653 		*idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
5654 		attr = nla_nest_start_noflag(skb,
5655 					     IFLA_STATS_LINK_OFFLOAD_XSTATS);
5656 		if (!attr) {
5657 			err = -EMSGSIZE;
5658 			goto nla_put_failure;
5659 		}
5660 
5661 		err = rtnl_offload_xstats_fill(skb, dev, prividx,
5662 					       off_filter_mask, extack);
5663 		if (err == -ENODATA)
5664 			nla_nest_cancel(skb, attr);
5665 		else
5666 			nla_nest_end(skb, attr);
5667 
5668 		if (err && err != -ENODATA)
5669 			goto nla_put_failure;
5670 		*idxattr = 0;
5671 	}
5672 
5673 	if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
5674 		struct rtnl_af_ops *af_ops;
5675 
5676 		*idxattr = IFLA_STATS_AF_SPEC;
5677 		attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
5678 		if (!attr) {
5679 			err = -EMSGSIZE;
5680 			goto nla_put_failure;
5681 		}
5682 
5683 		rcu_read_lock();
5684 		list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5685 			if (af_ops->fill_stats_af) {
5686 				struct nlattr *af;
5687 
5688 				af = nla_nest_start_noflag(skb,
5689 							   af_ops->family);
5690 				if (!af) {
5691 					rcu_read_unlock();
5692 					err = -EMSGSIZE;
5693 					goto nla_put_failure;
5694 				}
5695 				err = af_ops->fill_stats_af(skb, dev);
5696 
5697 				if (err == -ENODATA) {
5698 					nla_nest_cancel(skb, af);
5699 				} else if (err < 0) {
5700 					rcu_read_unlock();
5701 					goto nla_put_failure;
5702 				}
5703 
5704 				nla_nest_end(skb, af);
5705 			}
5706 		}
5707 		rcu_read_unlock();
5708 
5709 		nla_nest_end(skb, attr);
5710 
5711 		*idxattr = 0;
5712 	}
5713 
5714 	nlmsg_end(skb, nlh);
5715 
5716 	return 0;
5717 
5718 nla_put_failure:
5719 	/* not a multi message or no progress mean a real error */
5720 	if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
5721 		nlmsg_cancel(skb, nlh);
5722 	else
5723 		nlmsg_end(skb, nlh);
5724 
5725 	return err;
5726 }
5727 
if_nlmsg_stats_size(const struct net_device * dev,const struct rtnl_stats_dump_filters * filters)5728 static size_t if_nlmsg_stats_size(const struct net_device *dev,
5729 				  const struct rtnl_stats_dump_filters *filters)
5730 {
5731 	size_t size = NLMSG_ALIGN(sizeof(struct if_stats_msg));
5732 	unsigned int filter_mask = filters->mask[0];
5733 
5734 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
5735 		size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
5736 
5737 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
5738 		const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5739 		int attr = IFLA_STATS_LINK_XSTATS;
5740 
5741 		if (ops && ops->get_linkxstats_size) {
5742 			size += nla_total_size(ops->get_linkxstats_size(dev,
5743 									attr));
5744 			/* for IFLA_STATS_LINK_XSTATS */
5745 			size += nla_total_size(0);
5746 		}
5747 	}
5748 
5749 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
5750 		struct net_device *_dev = (struct net_device *)dev;
5751 		const struct rtnl_link_ops *ops = NULL;
5752 		const struct net_device *master;
5753 
5754 		/* netdev_master_upper_dev_get can't take const */
5755 		master = netdev_master_upper_dev_get(_dev);
5756 		if (master)
5757 			ops = master->rtnl_link_ops;
5758 		if (ops && ops->get_linkxstats_size) {
5759 			int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
5760 
5761 			size += nla_total_size(ops->get_linkxstats_size(dev,
5762 									attr));
5763 			/* for IFLA_STATS_LINK_XSTATS_SLAVE */
5764 			size += nla_total_size(0);
5765 		}
5766 	}
5767 
5768 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0)) {
5769 		u32 off_filter_mask;
5770 
5771 		off_filter_mask = filters->mask[IFLA_STATS_LINK_OFFLOAD_XSTATS];
5772 		size += rtnl_offload_xstats_get_size(dev, off_filter_mask);
5773 	}
5774 
5775 	if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
5776 		struct rtnl_af_ops *af_ops;
5777 
5778 		/* for IFLA_STATS_AF_SPEC */
5779 		size += nla_total_size(0);
5780 
5781 		rcu_read_lock();
5782 		list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5783 			if (af_ops->get_stats_af_size) {
5784 				size += nla_total_size(
5785 					af_ops->get_stats_af_size(dev));
5786 
5787 				/* for AF_* */
5788 				size += nla_total_size(0);
5789 			}
5790 		}
5791 		rcu_read_unlock();
5792 	}
5793 
5794 	return size;
5795 }
5796 
5797 #define RTNL_STATS_OFFLOAD_XSTATS_VALID ((1 << __IFLA_OFFLOAD_XSTATS_MAX) - 1)
5798 
5799 static const struct nla_policy
5800 rtnl_stats_get_policy_filters[IFLA_STATS_MAX + 1] = {
5801 	[IFLA_STATS_LINK_OFFLOAD_XSTATS] =
5802 		    NLA_POLICY_MASK(NLA_U32, RTNL_STATS_OFFLOAD_XSTATS_VALID),
5803 };
5804 
5805 static const struct nla_policy
5806 rtnl_stats_get_policy[IFLA_STATS_GETSET_MAX + 1] = {
5807 	[IFLA_STATS_GET_FILTERS] =
5808 		    NLA_POLICY_NESTED(rtnl_stats_get_policy_filters),
5809 };
5810 
5811 static const struct nla_policy
5812 ifla_stats_set_policy[IFLA_STATS_GETSET_MAX + 1] = {
5813 	[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS] = NLA_POLICY_MAX(NLA_U8, 1),
5814 };
5815 
rtnl_stats_get_parse_filters(struct nlattr * ifla_filters,struct rtnl_stats_dump_filters * filters,struct netlink_ext_ack * extack)5816 static int rtnl_stats_get_parse_filters(struct nlattr *ifla_filters,
5817 					struct rtnl_stats_dump_filters *filters,
5818 					struct netlink_ext_ack *extack)
5819 {
5820 	struct nlattr *tb[IFLA_STATS_MAX + 1];
5821 	int err;
5822 	int at;
5823 
5824 	err = nla_parse_nested(tb, IFLA_STATS_MAX, ifla_filters,
5825 			       rtnl_stats_get_policy_filters, extack);
5826 	if (err < 0)
5827 		return err;
5828 
5829 	for (at = 1; at <= IFLA_STATS_MAX; at++) {
5830 		if (tb[at]) {
5831 			if (!(filters->mask[0] & IFLA_STATS_FILTER_BIT(at))) {
5832 				NL_SET_ERR_MSG(extack, "Filtered attribute not enabled in filter_mask");
5833 				return -EINVAL;
5834 			}
5835 			filters->mask[at] = nla_get_u32(tb[at]);
5836 		}
5837 	}
5838 
5839 	return 0;
5840 }
5841 
rtnl_stats_get_parse(const struct nlmsghdr * nlh,u32 filter_mask,struct rtnl_stats_dump_filters * filters,struct netlink_ext_ack * extack)5842 static int rtnl_stats_get_parse(const struct nlmsghdr *nlh,
5843 				u32 filter_mask,
5844 				struct rtnl_stats_dump_filters *filters,
5845 				struct netlink_ext_ack *extack)
5846 {
5847 	struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1];
5848 	int err;
5849 	int i;
5850 
5851 	filters->mask[0] = filter_mask;
5852 	for (i = 1; i < ARRAY_SIZE(filters->mask); i++)
5853 		filters->mask[i] = -1U;
5854 
5855 	err = nlmsg_parse(nlh, sizeof(struct if_stats_msg), tb,
5856 			  IFLA_STATS_GETSET_MAX, rtnl_stats_get_policy, extack);
5857 	if (err < 0)
5858 		return err;
5859 
5860 	if (tb[IFLA_STATS_GET_FILTERS]) {
5861 		err = rtnl_stats_get_parse_filters(tb[IFLA_STATS_GET_FILTERS],
5862 						   filters, extack);
5863 		if (err)
5864 			return err;
5865 	}
5866 
5867 	return 0;
5868 }
5869 
rtnl_valid_stats_req(const struct nlmsghdr * nlh,bool strict_check,bool is_dump,struct netlink_ext_ack * extack)5870 static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
5871 				bool is_dump, struct netlink_ext_ack *extack)
5872 {
5873 	struct if_stats_msg *ifsm;
5874 
5875 	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
5876 		NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
5877 		return -EINVAL;
5878 	}
5879 
5880 	if (!strict_check)
5881 		return 0;
5882 
5883 	ifsm = nlmsg_data(nlh);
5884 
5885 	/* only requests using strict checks can pass data to influence
5886 	 * the dump. The legacy exception is filter_mask.
5887 	 */
5888 	if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
5889 		NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
5890 		return -EINVAL;
5891 	}
5892 	if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5893 		NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5894 		return -EINVAL;
5895 	}
5896 
5897 	return 0;
5898 }
5899 
rtnl_stats_get(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5900 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5901 			  struct netlink_ext_ack *extack)
5902 {
5903 	struct rtnl_stats_dump_filters filters;
5904 	struct net *net = sock_net(skb->sk);
5905 	struct net_device *dev = NULL;
5906 	int idxattr = 0, prividx = 0;
5907 	struct if_stats_msg *ifsm;
5908 	struct sk_buff *nskb;
5909 	int err;
5910 
5911 	err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5912 				   false, extack);
5913 	if (err)
5914 		return err;
5915 
5916 	ifsm = nlmsg_data(nlh);
5917 	if (ifsm->ifindex > 0)
5918 		dev = __dev_get_by_index(net, ifsm->ifindex);
5919 	else
5920 		return -EINVAL;
5921 
5922 	if (!dev)
5923 		return -ENODEV;
5924 
5925 	if (!ifsm->filter_mask) {
5926 		NL_SET_ERR_MSG(extack, "Filter mask must be set for stats get");
5927 		return -EINVAL;
5928 	}
5929 
5930 	err = rtnl_stats_get_parse(nlh, ifsm->filter_mask, &filters, extack);
5931 	if (err)
5932 		return err;
5933 
5934 	nskb = nlmsg_new(if_nlmsg_stats_size(dev, &filters), GFP_KERNEL);
5935 	if (!nskb)
5936 		return -ENOBUFS;
5937 
5938 	err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5939 				  NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5940 				  0, &filters, &idxattr, &prividx, extack);
5941 	if (err < 0) {
5942 		/* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5943 		WARN_ON(err == -EMSGSIZE);
5944 		kfree_skb(nskb);
5945 	} else {
5946 		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5947 	}
5948 
5949 	return err;
5950 }
5951 
rtnl_stats_dump(struct sk_buff * skb,struct netlink_callback * cb)5952 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5953 {
5954 	struct netlink_ext_ack *extack = cb->extack;
5955 	int h, s_h, err, s_idx, s_idxattr, s_prividx;
5956 	struct rtnl_stats_dump_filters filters;
5957 	struct net *net = sock_net(skb->sk);
5958 	unsigned int flags = NLM_F_MULTI;
5959 	struct if_stats_msg *ifsm;
5960 	struct hlist_head *head;
5961 	struct net_device *dev;
5962 	int idx = 0;
5963 
5964 	s_h = cb->args[0];
5965 	s_idx = cb->args[1];
5966 	s_idxattr = cb->args[2];
5967 	s_prividx = cb->args[3];
5968 
5969 	cb->seq = net->dev_base_seq;
5970 
5971 	err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5972 	if (err)
5973 		return err;
5974 
5975 	ifsm = nlmsg_data(cb->nlh);
5976 	if (!ifsm->filter_mask) {
5977 		NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5978 		return -EINVAL;
5979 	}
5980 
5981 	err = rtnl_stats_get_parse(cb->nlh, ifsm->filter_mask, &filters,
5982 				   extack);
5983 	if (err)
5984 		return err;
5985 
5986 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5987 		idx = 0;
5988 		head = &net->dev_index_head[h];
5989 		hlist_for_each_entry(dev, head, index_hlist) {
5990 			if (idx < s_idx)
5991 				goto cont;
5992 			err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5993 						  NETLINK_CB(cb->skb).portid,
5994 						  cb->nlh->nlmsg_seq, 0,
5995 						  flags, &filters,
5996 						  &s_idxattr, &s_prividx,
5997 						  extack);
5998 			/* If we ran out of room on the first message,
5999 			 * we're in trouble
6000 			 */
6001 			WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
6002 
6003 			if (err < 0)
6004 				goto out;
6005 			s_prividx = 0;
6006 			s_idxattr = 0;
6007 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6008 cont:
6009 			idx++;
6010 		}
6011 	}
6012 out:
6013 	cb->args[3] = s_prividx;
6014 	cb->args[2] = s_idxattr;
6015 	cb->args[1] = idx;
6016 	cb->args[0] = h;
6017 
6018 	return skb->len;
6019 }
6020 
rtnl_offload_xstats_notify(struct net_device * dev)6021 void rtnl_offload_xstats_notify(struct net_device *dev)
6022 {
6023 	struct rtnl_stats_dump_filters response_filters = {};
6024 	struct net *net = dev_net(dev);
6025 	int idxattr = 0, prividx = 0;
6026 	struct sk_buff *skb;
6027 	int err = -ENOBUFS;
6028 
6029 	ASSERT_RTNL();
6030 
6031 	response_filters.mask[0] |=
6032 		IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_OFFLOAD_XSTATS);
6033 	response_filters.mask[IFLA_STATS_LINK_OFFLOAD_XSTATS] |=
6034 		IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO);
6035 
6036 	skb = nlmsg_new(if_nlmsg_stats_size(dev, &response_filters),
6037 			GFP_KERNEL);
6038 	if (!skb)
6039 		goto errout;
6040 
6041 	err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS, 0, 0, 0, 0,
6042 				  &response_filters, &idxattr, &prividx, NULL);
6043 	if (err < 0) {
6044 		kfree_skb(skb);
6045 		goto errout;
6046 	}
6047 
6048 	rtnl_notify(skb, net, 0, RTNLGRP_STATS, NULL, GFP_KERNEL);
6049 	return;
6050 
6051 errout:
6052 	rtnl_set_sk_err(net, RTNLGRP_STATS, err);
6053 }
6054 EXPORT_SYMBOL(rtnl_offload_xstats_notify);
6055 
rtnl_stats_set(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)6056 static int rtnl_stats_set(struct sk_buff *skb, struct nlmsghdr *nlh,
6057 			  struct netlink_ext_ack *extack)
6058 {
6059 	enum netdev_offload_xstats_type t_l3 = NETDEV_OFFLOAD_XSTATS_TYPE_L3;
6060 	struct rtnl_stats_dump_filters response_filters = {};
6061 	struct nlattr *tb[IFLA_STATS_GETSET_MAX + 1];
6062 	struct net *net = sock_net(skb->sk);
6063 	struct net_device *dev = NULL;
6064 	struct if_stats_msg *ifsm;
6065 	bool notify = false;
6066 	int err;
6067 
6068 	err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
6069 				   false, extack);
6070 	if (err)
6071 		return err;
6072 
6073 	ifsm = nlmsg_data(nlh);
6074 	if (ifsm->family != AF_UNSPEC) {
6075 		NL_SET_ERR_MSG(extack, "Address family should be AF_UNSPEC");
6076 		return -EINVAL;
6077 	}
6078 
6079 	if (ifsm->ifindex > 0)
6080 		dev = __dev_get_by_index(net, ifsm->ifindex);
6081 	else
6082 		return -EINVAL;
6083 
6084 	if (!dev)
6085 		return -ENODEV;
6086 
6087 	if (ifsm->filter_mask) {
6088 		NL_SET_ERR_MSG(extack, "Filter mask must be 0 for stats set");
6089 		return -EINVAL;
6090 	}
6091 
6092 	err = nlmsg_parse(nlh, sizeof(*ifsm), tb, IFLA_STATS_GETSET_MAX,
6093 			  ifla_stats_set_policy, extack);
6094 	if (err < 0)
6095 		return err;
6096 
6097 	if (tb[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS]) {
6098 		u8 req = nla_get_u8(tb[IFLA_STATS_SET_OFFLOAD_XSTATS_L3_STATS]);
6099 
6100 		if (req)
6101 			err = netdev_offload_xstats_enable(dev, t_l3, extack);
6102 		else
6103 			err = netdev_offload_xstats_disable(dev, t_l3);
6104 
6105 		if (!err)
6106 			notify = true;
6107 		else if (err != -EALREADY)
6108 			return err;
6109 
6110 		response_filters.mask[0] |=
6111 			IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_OFFLOAD_XSTATS);
6112 		response_filters.mask[IFLA_STATS_LINK_OFFLOAD_XSTATS] |=
6113 			IFLA_STATS_FILTER_BIT(IFLA_OFFLOAD_XSTATS_HW_S_INFO);
6114 	}
6115 
6116 	if (notify)
6117 		rtnl_offload_xstats_notify(dev);
6118 
6119 	return 0;
6120 }
6121 
rtnl_mdb_valid_dump_req(const struct nlmsghdr * nlh,struct netlink_ext_ack * extack)6122 static int rtnl_mdb_valid_dump_req(const struct nlmsghdr *nlh,
6123 				   struct netlink_ext_ack *extack)
6124 {
6125 	struct br_port_msg *bpm;
6126 
6127 	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) {
6128 		NL_SET_ERR_MSG(extack, "Invalid header for mdb dump request");
6129 		return -EINVAL;
6130 	}
6131 
6132 	bpm = nlmsg_data(nlh);
6133 	if (bpm->ifindex) {
6134 		NL_SET_ERR_MSG(extack, "Filtering by device index is not supported for mdb dump request");
6135 		return -EINVAL;
6136 	}
6137 	if (nlmsg_attrlen(nlh, sizeof(*bpm))) {
6138 		NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request");
6139 		return -EINVAL;
6140 	}
6141 
6142 	return 0;
6143 }
6144 
6145 struct rtnl_mdb_dump_ctx {
6146 	long idx;
6147 };
6148 
rtnl_mdb_dump(struct sk_buff * skb,struct netlink_callback * cb)6149 static int rtnl_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
6150 {
6151 	struct rtnl_mdb_dump_ctx *ctx = (void *)cb->ctx;
6152 	struct net *net = sock_net(skb->sk);
6153 	struct net_device *dev;
6154 	int idx, s_idx;
6155 	int err;
6156 
6157 	NL_ASSERT_DUMP_CTX_FITS(struct rtnl_mdb_dump_ctx);
6158 
6159 	if (cb->strict_check) {
6160 		err = rtnl_mdb_valid_dump_req(cb->nlh, cb->extack);
6161 		if (err)
6162 			return err;
6163 	}
6164 
6165 	s_idx = ctx->idx;
6166 	idx = 0;
6167 
6168 	for_each_netdev(net, dev) {
6169 		if (idx < s_idx)
6170 			goto skip;
6171 		if (!dev->netdev_ops->ndo_mdb_dump)
6172 			goto skip;
6173 
6174 		err = dev->netdev_ops->ndo_mdb_dump(dev, skb, cb);
6175 		if (err == -EMSGSIZE)
6176 			goto out;
6177 		/* Moving on to next device, reset markers and sequence
6178 		 * counters since they are all maintained per-device.
6179 		 */
6180 		memset(cb->ctx, 0, sizeof(cb->ctx));
6181 		cb->prev_seq = 0;
6182 		cb->seq = 0;
6183 skip:
6184 		idx++;
6185 	}
6186 
6187 out:
6188 	ctx->idx = idx;
6189 	return skb->len;
6190 }
6191 
rtnl_validate_mdb_entry(const struct nlattr * attr,struct netlink_ext_ack * extack)6192 static int rtnl_validate_mdb_entry(const struct nlattr *attr,
6193 				   struct netlink_ext_ack *extack)
6194 {
6195 	struct br_mdb_entry *entry = nla_data(attr);
6196 
6197 	if (nla_len(attr) != sizeof(struct br_mdb_entry)) {
6198 		NL_SET_ERR_MSG_ATTR(extack, attr, "Invalid attribute length");
6199 		return -EINVAL;
6200 	}
6201 
6202 	if (entry->ifindex == 0) {
6203 		NL_SET_ERR_MSG(extack, "Zero entry ifindex is not allowed");
6204 		return -EINVAL;
6205 	}
6206 
6207 	if (entry->addr.proto == htons(ETH_P_IP)) {
6208 		if (!ipv4_is_multicast(entry->addr.u.ip4) &&
6209 		    !ipv4_is_zeronet(entry->addr.u.ip4)) {
6210 			NL_SET_ERR_MSG(extack, "IPv4 entry group address is not multicast or 0.0.0.0");
6211 			return -EINVAL;
6212 		}
6213 		if (ipv4_is_local_multicast(entry->addr.u.ip4)) {
6214 			NL_SET_ERR_MSG(extack, "IPv4 entry group address is local multicast");
6215 			return -EINVAL;
6216 		}
6217 #if IS_ENABLED(CONFIG_IPV6)
6218 	} else if (entry->addr.proto == htons(ETH_P_IPV6)) {
6219 		if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) {
6220 			NL_SET_ERR_MSG(extack, "IPv6 entry group address is link-local all nodes");
6221 			return -EINVAL;
6222 		}
6223 #endif
6224 	} else if (entry->addr.proto == 0) {
6225 		/* L2 mdb */
6226 		if (!is_multicast_ether_addr(entry->addr.u.mac_addr)) {
6227 			NL_SET_ERR_MSG(extack, "L2 entry group is not multicast");
6228 			return -EINVAL;
6229 		}
6230 	} else {
6231 		NL_SET_ERR_MSG(extack, "Unknown entry protocol");
6232 		return -EINVAL;
6233 	}
6234 
6235 	if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) {
6236 		NL_SET_ERR_MSG(extack, "Unknown entry state");
6237 		return -EINVAL;
6238 	}
6239 	if (entry->vid >= VLAN_VID_MASK) {
6240 		NL_SET_ERR_MSG(extack, "Invalid entry VLAN id");
6241 		return -EINVAL;
6242 	}
6243 
6244 	return 0;
6245 }
6246 
6247 static const struct nla_policy mdba_policy[MDBA_SET_ENTRY_MAX + 1] = {
6248 	[MDBA_SET_ENTRY_UNSPEC] = { .strict_start_type = MDBA_SET_ENTRY_ATTRS + 1 },
6249 	[MDBA_SET_ENTRY] = NLA_POLICY_VALIDATE_FN(NLA_BINARY,
6250 						  rtnl_validate_mdb_entry,
6251 						  sizeof(struct br_mdb_entry)),
6252 	[MDBA_SET_ENTRY_ATTRS] = { .type = NLA_NESTED },
6253 };
6254 
rtnl_mdb_add(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)6255 static int rtnl_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
6256 			struct netlink_ext_ack *extack)
6257 {
6258 	struct nlattr *tb[MDBA_SET_ENTRY_MAX + 1];
6259 	struct net *net = sock_net(skb->sk);
6260 	struct br_port_msg *bpm;
6261 	struct net_device *dev;
6262 	int err;
6263 
6264 	err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb,
6265 				     MDBA_SET_ENTRY_MAX, mdba_policy, extack);
6266 	if (err)
6267 		return err;
6268 
6269 	bpm = nlmsg_data(nlh);
6270 	if (!bpm->ifindex) {
6271 		NL_SET_ERR_MSG(extack, "Invalid ifindex");
6272 		return -EINVAL;
6273 	}
6274 
6275 	dev = __dev_get_by_index(net, bpm->ifindex);
6276 	if (!dev) {
6277 		NL_SET_ERR_MSG(extack, "Device doesn't exist");
6278 		return -ENODEV;
6279 	}
6280 
6281 	if (NL_REQ_ATTR_CHECK(extack, NULL, tb, MDBA_SET_ENTRY)) {
6282 		NL_SET_ERR_MSG(extack, "Missing MDBA_SET_ENTRY attribute");
6283 		return -EINVAL;
6284 	}
6285 
6286 	if (!dev->netdev_ops->ndo_mdb_add) {
6287 		NL_SET_ERR_MSG(extack, "Device does not support MDB operations");
6288 		return -EOPNOTSUPP;
6289 	}
6290 
6291 	return dev->netdev_ops->ndo_mdb_add(dev, tb, nlh->nlmsg_flags, extack);
6292 }
6293 
rtnl_mdb_del(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)6294 static int rtnl_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
6295 			struct netlink_ext_ack *extack)
6296 {
6297 	struct nlattr *tb[MDBA_SET_ENTRY_MAX + 1];
6298 	struct net *net = sock_net(skb->sk);
6299 	struct br_port_msg *bpm;
6300 	struct net_device *dev;
6301 	int err;
6302 
6303 	err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb,
6304 				     MDBA_SET_ENTRY_MAX, mdba_policy, extack);
6305 	if (err)
6306 		return err;
6307 
6308 	bpm = nlmsg_data(nlh);
6309 	if (!bpm->ifindex) {
6310 		NL_SET_ERR_MSG(extack, "Invalid ifindex");
6311 		return -EINVAL;
6312 	}
6313 
6314 	dev = __dev_get_by_index(net, bpm->ifindex);
6315 	if (!dev) {
6316 		NL_SET_ERR_MSG(extack, "Device doesn't exist");
6317 		return -ENODEV;
6318 	}
6319 
6320 	if (NL_REQ_ATTR_CHECK(extack, NULL, tb, MDBA_SET_ENTRY)) {
6321 		NL_SET_ERR_MSG(extack, "Missing MDBA_SET_ENTRY attribute");
6322 		return -EINVAL;
6323 	}
6324 
6325 	if (!dev->netdev_ops->ndo_mdb_del) {
6326 		NL_SET_ERR_MSG(extack, "Device does not support MDB operations");
6327 		return -EOPNOTSUPP;
6328 	}
6329 
6330 	return dev->netdev_ops->ndo_mdb_del(dev, tb, extack);
6331 }
6332 
6333 /* Process one rtnetlink message. */
6334 
rtnetlink_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)6335 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
6336 			     struct netlink_ext_ack *extack)
6337 {
6338 	struct net *net = sock_net(skb->sk);
6339 	struct rtnl_link *link;
6340 	enum rtnl_kinds kind;
6341 	struct module *owner;
6342 	int err = -EOPNOTSUPP;
6343 	rtnl_doit_func doit;
6344 	unsigned int flags;
6345 	int family;
6346 	int type;
6347 
6348 	type = nlh->nlmsg_type;
6349 	if (type > RTM_MAX)
6350 		return -EOPNOTSUPP;
6351 
6352 	type -= RTM_BASE;
6353 
6354 	/* All the messages must have at least 1 byte length */
6355 	if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
6356 		return 0;
6357 
6358 	family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
6359 	kind = rtnl_msgtype_kind(type);
6360 
6361 	if (kind != RTNL_KIND_GET && !netlink_net_capable(skb, CAP_NET_ADMIN))
6362 		return -EPERM;
6363 
6364 	rcu_read_lock();
6365 	if (kind == RTNL_KIND_GET && (nlh->nlmsg_flags & NLM_F_DUMP)) {
6366 		struct sock *rtnl;
6367 		rtnl_dumpit_func dumpit;
6368 		u32 min_dump_alloc = 0;
6369 
6370 		link = rtnl_get_link(family, type);
6371 		if (!link || !link->dumpit) {
6372 			family = PF_UNSPEC;
6373 			link = rtnl_get_link(family, type);
6374 			if (!link || !link->dumpit)
6375 				goto err_unlock;
6376 		}
6377 		owner = link->owner;
6378 		dumpit = link->dumpit;
6379 
6380 		if (type == RTM_GETLINK - RTM_BASE)
6381 			min_dump_alloc = rtnl_calcit(skb, nlh);
6382 
6383 		err = 0;
6384 		/* need to do this before rcu_read_unlock() */
6385 		if (!try_module_get(owner))
6386 			err = -EPROTONOSUPPORT;
6387 
6388 		rcu_read_unlock();
6389 
6390 		rtnl = net->rtnl;
6391 		if (err == 0) {
6392 			struct netlink_dump_control c = {
6393 				.dump		= dumpit,
6394 				.min_dump_alloc	= min_dump_alloc,
6395 				.module		= owner,
6396 			};
6397 			err = netlink_dump_start(rtnl, skb, nlh, &c);
6398 			/* netlink_dump_start() will keep a reference on
6399 			 * module if dump is still in progress.
6400 			 */
6401 			module_put(owner);
6402 		}
6403 		return err;
6404 	}
6405 
6406 	link = rtnl_get_link(family, type);
6407 	if (!link || !link->doit) {
6408 		family = PF_UNSPEC;
6409 		link = rtnl_get_link(PF_UNSPEC, type);
6410 		if (!link || !link->doit)
6411 			goto out_unlock;
6412 	}
6413 
6414 	owner = link->owner;
6415 	if (!try_module_get(owner)) {
6416 		err = -EPROTONOSUPPORT;
6417 		goto out_unlock;
6418 	}
6419 
6420 	flags = link->flags;
6421 	if (kind == RTNL_KIND_DEL && (nlh->nlmsg_flags & NLM_F_BULK) &&
6422 	    !(flags & RTNL_FLAG_BULK_DEL_SUPPORTED)) {
6423 		NL_SET_ERR_MSG(extack, "Bulk delete is not supported");
6424 		module_put(owner);
6425 		goto err_unlock;
6426 	}
6427 
6428 	if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
6429 		doit = link->doit;
6430 		rcu_read_unlock();
6431 		if (doit)
6432 			err = doit(skb, nlh, extack);
6433 		module_put(owner);
6434 		return err;
6435 	}
6436 	rcu_read_unlock();
6437 
6438 	rtnl_lock();
6439 	link = rtnl_get_link(family, type);
6440 	if (link && link->doit)
6441 		err = link->doit(skb, nlh, extack);
6442 	rtnl_unlock();
6443 
6444 	module_put(owner);
6445 
6446 	return err;
6447 
6448 out_unlock:
6449 	rcu_read_unlock();
6450 	return err;
6451 
6452 err_unlock:
6453 	rcu_read_unlock();
6454 	return -EOPNOTSUPP;
6455 }
6456 
rtnetlink_rcv(struct sk_buff * skb)6457 static void rtnetlink_rcv(struct sk_buff *skb)
6458 {
6459 	netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
6460 }
6461 
rtnetlink_bind(struct net * net,int group)6462 static int rtnetlink_bind(struct net *net, int group)
6463 {
6464 	switch (group) {
6465 	case RTNLGRP_IPV4_MROUTE_R:
6466 	case RTNLGRP_IPV6_MROUTE_R:
6467 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
6468 			return -EPERM;
6469 		break;
6470 	}
6471 	return 0;
6472 }
6473 
rtnetlink_event(struct notifier_block * this,unsigned long event,void * ptr)6474 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
6475 {
6476 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6477 
6478 	switch (event) {
6479 	case NETDEV_REBOOT:
6480 	case NETDEV_CHANGEMTU:
6481 	case NETDEV_CHANGEADDR:
6482 	case NETDEV_CHANGENAME:
6483 	case NETDEV_FEAT_CHANGE:
6484 	case NETDEV_BONDING_FAILOVER:
6485 	case NETDEV_POST_TYPE_CHANGE:
6486 	case NETDEV_NOTIFY_PEERS:
6487 	case NETDEV_CHANGEUPPER:
6488 	case NETDEV_RESEND_IGMP:
6489 	case NETDEV_CHANGEINFODATA:
6490 	case NETDEV_CHANGELOWERSTATE:
6491 	case NETDEV_CHANGE_TX_QUEUE_LEN:
6492 		rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
6493 				   GFP_KERNEL, NULL, 0, 0, NULL);
6494 		break;
6495 	default:
6496 		break;
6497 	}
6498 	return NOTIFY_DONE;
6499 }
6500 
6501 static struct notifier_block rtnetlink_dev_notifier = {
6502 	.notifier_call	= rtnetlink_event,
6503 };
6504 
6505 
rtnetlink_net_init(struct net * net)6506 static int __net_init rtnetlink_net_init(struct net *net)
6507 {
6508 	struct sock *sk;
6509 	struct netlink_kernel_cfg cfg = {
6510 		.groups		= RTNLGRP_MAX,
6511 		.input		= rtnetlink_rcv,
6512 		.cb_mutex	= &rtnl_mutex,
6513 		.flags		= NL_CFG_F_NONROOT_RECV,
6514 		.bind		= rtnetlink_bind,
6515 	};
6516 
6517 	sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
6518 	if (!sk)
6519 		return -ENOMEM;
6520 	net->rtnl = sk;
6521 	return 0;
6522 }
6523 
rtnetlink_net_exit(struct net * net)6524 static void __net_exit rtnetlink_net_exit(struct net *net)
6525 {
6526 	netlink_kernel_release(net->rtnl);
6527 	net->rtnl = NULL;
6528 }
6529 
6530 static struct pernet_operations rtnetlink_net_ops = {
6531 	.init = rtnetlink_net_init,
6532 	.exit = rtnetlink_net_exit,
6533 };
6534 
rtnetlink_init(void)6535 void __init rtnetlink_init(void)
6536 {
6537 	if (register_pernet_subsys(&rtnetlink_net_ops))
6538 		panic("rtnetlink_init: cannot initialize rtnetlink\n");
6539 
6540 	register_netdevice_notifier(&rtnetlink_dev_notifier);
6541 
6542 	rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
6543 		      rtnl_dump_ifinfo, 0);
6544 	rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
6545 	rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
6546 	rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
6547 
6548 	rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
6549 	rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
6550 	rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
6551 
6552 	rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
6553 	rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
6554 
6555 	rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
6556 	rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL,
6557 		      RTNL_FLAG_BULK_DEL_SUPPORTED);
6558 	rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
6559 
6560 	rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
6561 	rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
6562 	rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
6563 
6564 	rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
6565 		      0);
6566 	rtnl_register(PF_UNSPEC, RTM_SETSTATS, rtnl_stats_set, NULL, 0);
6567 
6568 	rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, rtnl_mdb_dump, 0);
6569 	rtnl_register(PF_BRIDGE, RTM_NEWMDB, rtnl_mdb_add, NULL, 0);
6570 	rtnl_register(PF_BRIDGE, RTM_DELMDB, rtnl_mdb_del, NULL, 0);
6571 }
6572