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Linux/net/core/rtnetlink.c

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

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