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Merge remote-tracking branch 'asoc/topic/pcm512x' into asoc-next
[mirror_ubuntu-focal-kernel.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/bitops.h>
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/kernel.h>
25 #include <linux/timer.h>
26 #include <linux/string.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/fcntl.h>
30 #include <linux/mm.h>
31 #include <linux/slab.h>
32 #include <linux/interrupt.h>
33 #include <linux/capability.h>
34 #include <linux/skbuff.h>
35 #include <linux/init.h>
36 #include <linux/security.h>
37 #include <linux/mutex.h>
38 #include <linux/if_addr.h>
39 #include <linux/if_bridge.h>
40 #include <linux/if_vlan.h>
41 #include <linux/pci.h>
42 #include <linux/etherdevice.h>
43 #include <linux/bpf.h>
44
45 #include <linux/uaccess.h>
46
47 #include <linux/inet.h>
48 #include <linux/netdevice.h>
49 #include <net/switchdev.h>
50 #include <net/ip.h>
51 #include <net/protocol.h>
52 #include <net/arp.h>
53 #include <net/route.h>
54 #include <net/udp.h>
55 #include <net/tcp.h>
56 #include <net/sock.h>
57 #include <net/pkt_sched.h>
58 #include <net/fib_rules.h>
59 #include <net/rtnetlink.h>
60 #include <net/net_namespace.h>
61
62 struct rtnl_link {
63 rtnl_doit_func doit;
64 rtnl_dumpit_func dumpit;
65 unsigned int flags;
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 static struct sk_buff *defer_kfree_skb_list;
77 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
78 {
79 if (head && tail) {
80 tail->next = defer_kfree_skb_list;
81 defer_kfree_skb_list = head;
82 }
83 }
84 EXPORT_SYMBOL(rtnl_kfree_skbs);
85
86 void __rtnl_unlock(void)
87 {
88 struct sk_buff *head = defer_kfree_skb_list;
89
90 defer_kfree_skb_list = NULL;
91
92 mutex_unlock(&rtnl_mutex);
93
94 while (head) {
95 struct sk_buff *next = head->next;
96
97 kfree_skb(head);
98 cond_resched();
99 head = next;
100 }
101 }
102
103 void rtnl_unlock(void)
104 {
105 /* This fellow will unlock it for us. */
106 netdev_run_todo();
107 }
108 EXPORT_SYMBOL(rtnl_unlock);
109
110 int rtnl_trylock(void)
111 {
112 return mutex_trylock(&rtnl_mutex);
113 }
114 EXPORT_SYMBOL(rtnl_trylock);
115
116 int rtnl_is_locked(void)
117 {
118 return mutex_is_locked(&rtnl_mutex);
119 }
120 EXPORT_SYMBOL(rtnl_is_locked);
121
122 #ifdef CONFIG_PROVE_LOCKING
123 bool lockdep_rtnl_is_held(void)
124 {
125 return lockdep_is_held(&rtnl_mutex);
126 }
127 EXPORT_SYMBOL(lockdep_rtnl_is_held);
128 #endif /* #ifdef CONFIG_PROVE_LOCKING */
129
130 static struct rtnl_link __rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
131 static refcount_t rtnl_msg_handlers_ref[RTNL_FAMILY_MAX + 1];
132
133 static inline int rtm_msgindex(int msgtype)
134 {
135 int msgindex = msgtype - RTM_BASE;
136
137 /*
138 * msgindex < 0 implies someone tried to register a netlink
139 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
140 * the message type has not been added to linux/rtnetlink.h
141 */
142 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
143
144 return msgindex;
145 }
146
147 /**
148 * __rtnl_register - Register a rtnetlink message type
149 * @protocol: Protocol family or PF_UNSPEC
150 * @msgtype: rtnetlink message type
151 * @doit: Function pointer called for each request message
152 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
153 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
154 *
155 * Registers the specified function pointers (at least one of them has
156 * to be non-NULL) to be called whenever a request message for the
157 * specified protocol family and message type is received.
158 *
159 * The special protocol family PF_UNSPEC may be used to define fallback
160 * function pointers for the case when no entry for the specific protocol
161 * family exists.
162 *
163 * Returns 0 on success or a negative error code.
164 */
165 int __rtnl_register(int protocol, int msgtype,
166 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
167 unsigned int flags)
168 {
169 struct rtnl_link *tab;
170 int msgindex;
171
172 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
173 msgindex = rtm_msgindex(msgtype);
174
175 tab = rcu_dereference_raw(rtnl_msg_handlers[protocol]);
176 if (tab == NULL) {
177 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
178 if (tab == NULL)
179 return -ENOBUFS;
180
181 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
182 }
183
184 if (doit)
185 tab[msgindex].doit = doit;
186 if (dumpit)
187 tab[msgindex].dumpit = dumpit;
188 tab[msgindex].flags |= flags;
189
190 return 0;
191 }
192 EXPORT_SYMBOL_GPL(__rtnl_register);
193
194 /**
195 * rtnl_register - Register a rtnetlink message type
196 *
197 * Identical to __rtnl_register() but panics on failure. This is useful
198 * as failure of this function is very unlikely, it can only happen due
199 * to lack of memory when allocating the chain to store all message
200 * handlers for a protocol. Meant for use in init functions where lack
201 * of memory implies no sense in continuing.
202 */
203 void rtnl_register(int protocol, int msgtype,
204 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
205 unsigned int flags)
206 {
207 if (__rtnl_register(protocol, msgtype, doit, dumpit, flags) < 0)
208 panic("Unable to register rtnetlink message handler, "
209 "protocol = %d, message type = %d\n",
210 protocol, msgtype);
211 }
212 EXPORT_SYMBOL_GPL(rtnl_register);
213
214 /**
215 * rtnl_unregister - Unregister a rtnetlink message type
216 * @protocol: Protocol family or PF_UNSPEC
217 * @msgtype: rtnetlink message type
218 *
219 * Returns 0 on success or a negative error code.
220 */
221 int rtnl_unregister(int protocol, int msgtype)
222 {
223 struct rtnl_link *handlers;
224 int msgindex;
225
226 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
227 msgindex = rtm_msgindex(msgtype);
228
229 rtnl_lock();
230 handlers = rtnl_dereference(rtnl_msg_handlers[protocol]);
231 if (!handlers) {
232 rtnl_unlock();
233 return -ENOENT;
234 }
235
236 handlers[msgindex].doit = NULL;
237 handlers[msgindex].dumpit = NULL;
238 handlers[msgindex].flags = 0;
239 rtnl_unlock();
240
241 return 0;
242 }
243 EXPORT_SYMBOL_GPL(rtnl_unregister);
244
245 /**
246 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
247 * @protocol : Protocol family or PF_UNSPEC
248 *
249 * Identical to calling rtnl_unregster() for all registered message types
250 * of a certain protocol family.
251 */
252 void rtnl_unregister_all(int protocol)
253 {
254 struct rtnl_link *handlers;
255
256 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
257
258 rtnl_lock();
259 handlers = rtnl_dereference(rtnl_msg_handlers[protocol]);
260 RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
261 rtnl_unlock();
262
263 synchronize_net();
264
265 while (refcount_read(&rtnl_msg_handlers_ref[protocol]) > 1)
266 schedule();
267 kfree(handlers);
268 }
269 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
270
271 static LIST_HEAD(link_ops);
272
273 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
274 {
275 const struct rtnl_link_ops *ops;
276
277 list_for_each_entry(ops, &link_ops, list) {
278 if (!strcmp(ops->kind, kind))
279 return ops;
280 }
281 return NULL;
282 }
283
284 /**
285 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
286 * @ops: struct rtnl_link_ops * to register
287 *
288 * The caller must hold the rtnl_mutex. This function should be used
289 * by drivers that create devices during module initialization. It
290 * must be called before registering the devices.
291 *
292 * Returns 0 on success or a negative error code.
293 */
294 int __rtnl_link_register(struct rtnl_link_ops *ops)
295 {
296 if (rtnl_link_ops_get(ops->kind))
297 return -EEXIST;
298
299 /* The check for setup is here because if ops
300 * does not have that filled up, it is not possible
301 * to use the ops for creating device. So do not
302 * fill up dellink as well. That disables rtnl_dellink.
303 */
304 if (ops->setup && !ops->dellink)
305 ops->dellink = unregister_netdevice_queue;
306
307 list_add_tail(&ops->list, &link_ops);
308 return 0;
309 }
310 EXPORT_SYMBOL_GPL(__rtnl_link_register);
311
312 /**
313 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
314 * @ops: struct rtnl_link_ops * to register
315 *
316 * Returns 0 on success or a negative error code.
317 */
318 int rtnl_link_register(struct rtnl_link_ops *ops)
319 {
320 int err;
321
322 rtnl_lock();
323 err = __rtnl_link_register(ops);
324 rtnl_unlock();
325 return err;
326 }
327 EXPORT_SYMBOL_GPL(rtnl_link_register);
328
329 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
330 {
331 struct net_device *dev;
332 LIST_HEAD(list_kill);
333
334 for_each_netdev(net, dev) {
335 if (dev->rtnl_link_ops == ops)
336 ops->dellink(dev, &list_kill);
337 }
338 unregister_netdevice_many(&list_kill);
339 }
340
341 /**
342 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
343 * @ops: struct rtnl_link_ops * to unregister
344 *
345 * The caller must hold the rtnl_mutex.
346 */
347 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
348 {
349 struct net *net;
350
351 for_each_net(net) {
352 __rtnl_kill_links(net, ops);
353 }
354 list_del(&ops->list);
355 }
356 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
357
358 /* Return with the rtnl_lock held when there are no network
359 * devices unregistering in any network namespace.
360 */
361 static void rtnl_lock_unregistering_all(void)
362 {
363 struct net *net;
364 bool unregistering;
365 DEFINE_WAIT_FUNC(wait, woken_wake_function);
366
367 add_wait_queue(&netdev_unregistering_wq, &wait);
368 for (;;) {
369 unregistering = false;
370 rtnl_lock();
371 for_each_net(net) {
372 if (net->dev_unreg_count > 0) {
373 unregistering = true;
374 break;
375 }
376 }
377 if (!unregistering)
378 break;
379 __rtnl_unlock();
380
381 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
382 }
383 remove_wait_queue(&netdev_unregistering_wq, &wait);
384 }
385
386 /**
387 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
388 * @ops: struct rtnl_link_ops * to unregister
389 */
390 void rtnl_link_unregister(struct rtnl_link_ops *ops)
391 {
392 /* Close the race with cleanup_net() */
393 mutex_lock(&net_mutex);
394 rtnl_lock_unregistering_all();
395 __rtnl_link_unregister(ops);
396 rtnl_unlock();
397 mutex_unlock(&net_mutex);
398 }
399 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
400
401 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
402 {
403 struct net_device *master_dev;
404 const struct rtnl_link_ops *ops;
405 size_t size = 0;
406
407 rcu_read_lock();
408
409 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
410 if (!master_dev)
411 goto out;
412
413 ops = master_dev->rtnl_link_ops;
414 if (!ops || !ops->get_slave_size)
415 goto out;
416 /* IFLA_INFO_SLAVE_DATA + nested data */
417 size = nla_total_size(sizeof(struct nlattr)) +
418 ops->get_slave_size(master_dev, dev);
419
420 out:
421 rcu_read_unlock();
422 return size;
423 }
424
425 static size_t rtnl_link_get_size(const struct net_device *dev)
426 {
427 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
428 size_t size;
429
430 if (!ops)
431 return 0;
432
433 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
434 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
435
436 if (ops->get_size)
437 /* IFLA_INFO_DATA + nested data */
438 size += nla_total_size(sizeof(struct nlattr)) +
439 ops->get_size(dev);
440
441 if (ops->get_xstats_size)
442 /* IFLA_INFO_XSTATS */
443 size += nla_total_size(ops->get_xstats_size(dev));
444
445 size += rtnl_link_get_slave_info_data_size(dev);
446
447 return size;
448 }
449
450 static LIST_HEAD(rtnl_af_ops);
451
452 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
453 {
454 const struct rtnl_af_ops *ops;
455
456 list_for_each_entry_rcu(ops, &rtnl_af_ops, list) {
457 if (ops->family == family)
458 return ops;
459 }
460
461 return NULL;
462 }
463
464 /**
465 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
466 * @ops: struct rtnl_af_ops * to register
467 *
468 * Returns 0 on success or a negative error code.
469 */
470 void rtnl_af_register(struct rtnl_af_ops *ops)
471 {
472 rtnl_lock();
473 list_add_tail_rcu(&ops->list, &rtnl_af_ops);
474 rtnl_unlock();
475 }
476 EXPORT_SYMBOL_GPL(rtnl_af_register);
477
478 /**
479 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
480 * @ops: struct rtnl_af_ops * to unregister
481 */
482 void rtnl_af_unregister(struct rtnl_af_ops *ops)
483 {
484 rtnl_lock();
485 list_del_rcu(&ops->list);
486 rtnl_unlock();
487
488 synchronize_rcu();
489 }
490 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
491
492 static size_t rtnl_link_get_af_size(const struct net_device *dev,
493 u32 ext_filter_mask)
494 {
495 struct rtnl_af_ops *af_ops;
496 size_t size;
497
498 /* IFLA_AF_SPEC */
499 size = nla_total_size(sizeof(struct nlattr));
500
501 rcu_read_lock();
502 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
503 if (af_ops->get_link_af_size) {
504 /* AF_* + nested data */
505 size += nla_total_size(sizeof(struct nlattr)) +
506 af_ops->get_link_af_size(dev, ext_filter_mask);
507 }
508 }
509 rcu_read_unlock();
510
511 return size;
512 }
513
514 static bool rtnl_have_link_slave_info(const struct net_device *dev)
515 {
516 struct net_device *master_dev;
517 bool ret = false;
518
519 rcu_read_lock();
520
521 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
522 if (master_dev && master_dev->rtnl_link_ops)
523 ret = true;
524 rcu_read_unlock();
525 return ret;
526 }
527
528 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
529 const struct net_device *dev)
530 {
531 struct net_device *master_dev;
532 const struct rtnl_link_ops *ops;
533 struct nlattr *slave_data;
534 int err;
535
536 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
537 if (!master_dev)
538 return 0;
539 ops = master_dev->rtnl_link_ops;
540 if (!ops)
541 return 0;
542 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
543 return -EMSGSIZE;
544 if (ops->fill_slave_info) {
545 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
546 if (!slave_data)
547 return -EMSGSIZE;
548 err = ops->fill_slave_info(skb, master_dev, dev);
549 if (err < 0)
550 goto err_cancel_slave_data;
551 nla_nest_end(skb, slave_data);
552 }
553 return 0;
554
555 err_cancel_slave_data:
556 nla_nest_cancel(skb, slave_data);
557 return err;
558 }
559
560 static int rtnl_link_info_fill(struct sk_buff *skb,
561 const struct net_device *dev)
562 {
563 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
564 struct nlattr *data;
565 int err;
566
567 if (!ops)
568 return 0;
569 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
570 return -EMSGSIZE;
571 if (ops->fill_xstats) {
572 err = ops->fill_xstats(skb, dev);
573 if (err < 0)
574 return err;
575 }
576 if (ops->fill_info) {
577 data = nla_nest_start(skb, IFLA_INFO_DATA);
578 if (data == NULL)
579 return -EMSGSIZE;
580 err = ops->fill_info(skb, dev);
581 if (err < 0)
582 goto err_cancel_data;
583 nla_nest_end(skb, data);
584 }
585 return 0;
586
587 err_cancel_data:
588 nla_nest_cancel(skb, data);
589 return err;
590 }
591
592 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
593 {
594 struct nlattr *linkinfo;
595 int err = -EMSGSIZE;
596
597 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
598 if (linkinfo == NULL)
599 goto out;
600
601 err = rtnl_link_info_fill(skb, dev);
602 if (err < 0)
603 goto err_cancel_link;
604
605 err = rtnl_link_slave_info_fill(skb, dev);
606 if (err < 0)
607 goto err_cancel_link;
608
609 nla_nest_end(skb, linkinfo);
610 return 0;
611
612 err_cancel_link:
613 nla_nest_cancel(skb, linkinfo);
614 out:
615 return err;
616 }
617
618 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
619 {
620 struct sock *rtnl = net->rtnl;
621 int err = 0;
622
623 NETLINK_CB(skb).dst_group = group;
624 if (echo)
625 refcount_inc(&skb->users);
626 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
627 if (echo)
628 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
629 return err;
630 }
631
632 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
633 {
634 struct sock *rtnl = net->rtnl;
635
636 return nlmsg_unicast(rtnl, skb, pid);
637 }
638 EXPORT_SYMBOL(rtnl_unicast);
639
640 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
641 struct nlmsghdr *nlh, gfp_t flags)
642 {
643 struct sock *rtnl = net->rtnl;
644 int report = 0;
645
646 if (nlh)
647 report = nlmsg_report(nlh);
648
649 nlmsg_notify(rtnl, skb, pid, group, report, flags);
650 }
651 EXPORT_SYMBOL(rtnl_notify);
652
653 void rtnl_set_sk_err(struct net *net, u32 group, int error)
654 {
655 struct sock *rtnl = net->rtnl;
656
657 netlink_set_err(rtnl, 0, group, error);
658 }
659 EXPORT_SYMBOL(rtnl_set_sk_err);
660
661 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
662 {
663 struct nlattr *mx;
664 int i, valid = 0;
665
666 mx = nla_nest_start(skb, RTA_METRICS);
667 if (mx == NULL)
668 return -ENOBUFS;
669
670 for (i = 0; i < RTAX_MAX; i++) {
671 if (metrics[i]) {
672 if (i == RTAX_CC_ALGO - 1) {
673 char tmp[TCP_CA_NAME_MAX], *name;
674
675 name = tcp_ca_get_name_by_key(metrics[i], tmp);
676 if (!name)
677 continue;
678 if (nla_put_string(skb, i + 1, name))
679 goto nla_put_failure;
680 } else if (i == RTAX_FEATURES - 1) {
681 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
682
683 if (!user_features)
684 continue;
685 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
686 if (nla_put_u32(skb, i + 1, user_features))
687 goto nla_put_failure;
688 } else {
689 if (nla_put_u32(skb, i + 1, metrics[i]))
690 goto nla_put_failure;
691 }
692 valid++;
693 }
694 }
695
696 if (!valid) {
697 nla_nest_cancel(skb, mx);
698 return 0;
699 }
700
701 return nla_nest_end(skb, mx);
702
703 nla_put_failure:
704 nla_nest_cancel(skb, mx);
705 return -EMSGSIZE;
706 }
707 EXPORT_SYMBOL(rtnetlink_put_metrics);
708
709 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
710 long expires, u32 error)
711 {
712 struct rta_cacheinfo ci = {
713 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
714 .rta_used = dst->__use,
715 .rta_clntref = atomic_read(&(dst->__refcnt)),
716 .rta_error = error,
717 .rta_id = id,
718 };
719
720 if (expires) {
721 unsigned long clock;
722
723 clock = jiffies_to_clock_t(abs(expires));
724 clock = min_t(unsigned long, clock, INT_MAX);
725 ci.rta_expires = (expires > 0) ? clock : -clock;
726 }
727 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
728 }
729 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
730
731 static void set_operstate(struct net_device *dev, unsigned char transition)
732 {
733 unsigned char operstate = dev->operstate;
734
735 switch (transition) {
736 case IF_OPER_UP:
737 if ((operstate == IF_OPER_DORMANT ||
738 operstate == IF_OPER_UNKNOWN) &&
739 !netif_dormant(dev))
740 operstate = IF_OPER_UP;
741 break;
742
743 case IF_OPER_DORMANT:
744 if (operstate == IF_OPER_UP ||
745 operstate == IF_OPER_UNKNOWN)
746 operstate = IF_OPER_DORMANT;
747 break;
748 }
749
750 if (dev->operstate != operstate) {
751 write_lock_bh(&dev_base_lock);
752 dev->operstate = operstate;
753 write_unlock_bh(&dev_base_lock);
754 netdev_state_change(dev);
755 }
756 }
757
758 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
759 {
760 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
761 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
762 }
763
764 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
765 const struct ifinfomsg *ifm)
766 {
767 unsigned int flags = ifm->ifi_flags;
768
769 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
770 if (ifm->ifi_change)
771 flags = (flags & ifm->ifi_change) |
772 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
773
774 return flags;
775 }
776
777 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
778 const struct rtnl_link_stats64 *b)
779 {
780 a->rx_packets = b->rx_packets;
781 a->tx_packets = b->tx_packets;
782 a->rx_bytes = b->rx_bytes;
783 a->tx_bytes = b->tx_bytes;
784 a->rx_errors = b->rx_errors;
785 a->tx_errors = b->tx_errors;
786 a->rx_dropped = b->rx_dropped;
787 a->tx_dropped = b->tx_dropped;
788
789 a->multicast = b->multicast;
790 a->collisions = b->collisions;
791
792 a->rx_length_errors = b->rx_length_errors;
793 a->rx_over_errors = b->rx_over_errors;
794 a->rx_crc_errors = b->rx_crc_errors;
795 a->rx_frame_errors = b->rx_frame_errors;
796 a->rx_fifo_errors = b->rx_fifo_errors;
797 a->rx_missed_errors = b->rx_missed_errors;
798
799 a->tx_aborted_errors = b->tx_aborted_errors;
800 a->tx_carrier_errors = b->tx_carrier_errors;
801 a->tx_fifo_errors = b->tx_fifo_errors;
802 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
803 a->tx_window_errors = b->tx_window_errors;
804
805 a->rx_compressed = b->rx_compressed;
806 a->tx_compressed = b->tx_compressed;
807
808 a->rx_nohandler = b->rx_nohandler;
809 }
810
811 /* All VF info */
812 static inline int rtnl_vfinfo_size(const struct net_device *dev,
813 u32 ext_filter_mask)
814 {
815 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
816 int num_vfs = dev_num_vf(dev->dev.parent);
817 size_t size = nla_total_size(0);
818 size += num_vfs *
819 (nla_total_size(0) +
820 nla_total_size(sizeof(struct ifla_vf_mac)) +
821 nla_total_size(sizeof(struct ifla_vf_vlan)) +
822 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
823 nla_total_size(MAX_VLAN_LIST_LEN *
824 sizeof(struct ifla_vf_vlan_info)) +
825 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
826 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
827 nla_total_size(sizeof(struct ifla_vf_rate)) +
828 nla_total_size(sizeof(struct ifla_vf_link_state)) +
829 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
830 nla_total_size(0) + /* nest IFLA_VF_STATS */
831 /* IFLA_VF_STATS_RX_PACKETS */
832 nla_total_size_64bit(sizeof(__u64)) +
833 /* IFLA_VF_STATS_TX_PACKETS */
834 nla_total_size_64bit(sizeof(__u64)) +
835 /* IFLA_VF_STATS_RX_BYTES */
836 nla_total_size_64bit(sizeof(__u64)) +
837 /* IFLA_VF_STATS_TX_BYTES */
838 nla_total_size_64bit(sizeof(__u64)) +
839 /* IFLA_VF_STATS_BROADCAST */
840 nla_total_size_64bit(sizeof(__u64)) +
841 /* IFLA_VF_STATS_MULTICAST */
842 nla_total_size_64bit(sizeof(__u64)) +
843 nla_total_size(sizeof(struct ifla_vf_trust)));
844 return size;
845 } else
846 return 0;
847 }
848
849 static size_t rtnl_port_size(const struct net_device *dev,
850 u32 ext_filter_mask)
851 {
852 size_t port_size = nla_total_size(4) /* PORT_VF */
853 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
854 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
855 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
856 + nla_total_size(1) /* PROT_VDP_REQUEST */
857 + nla_total_size(2); /* PORT_VDP_RESPONSE */
858 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
859 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
860 + port_size;
861 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
862 + port_size;
863
864 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
865 !(ext_filter_mask & RTEXT_FILTER_VF))
866 return 0;
867 if (dev_num_vf(dev->dev.parent))
868 return port_self_size + vf_ports_size +
869 vf_port_size * dev_num_vf(dev->dev.parent);
870 else
871 return port_self_size;
872 }
873
874 static size_t rtnl_xdp_size(void)
875 {
876 size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */
877 nla_total_size(1) + /* XDP_ATTACHED */
878 nla_total_size(4); /* XDP_PROG_ID */
879
880 return xdp_size;
881 }
882
883 static noinline size_t if_nlmsg_size(const struct net_device *dev,
884 u32 ext_filter_mask)
885 {
886 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
887 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
888 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
889 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
890 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
891 + nla_total_size(sizeof(struct rtnl_link_stats))
892 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
893 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
894 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
895 + nla_total_size(4) /* IFLA_TXQLEN */
896 + nla_total_size(4) /* IFLA_WEIGHT */
897 + nla_total_size(4) /* IFLA_MTU */
898 + nla_total_size(4) /* IFLA_LINK */
899 + nla_total_size(4) /* IFLA_MASTER */
900 + nla_total_size(1) /* IFLA_CARRIER */
901 + nla_total_size(4) /* IFLA_PROMISCUITY */
902 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
903 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
904 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
905 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
906 + nla_total_size(1) /* IFLA_OPERSTATE */
907 + nla_total_size(1) /* IFLA_LINKMODE */
908 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
909 + nla_total_size(4) /* IFLA_LINK_NETNSID */
910 + nla_total_size(4) /* IFLA_GROUP */
911 + nla_total_size(ext_filter_mask
912 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
913 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
914 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
915 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
916 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
917 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
918 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
919 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
920 + rtnl_xdp_size() /* IFLA_XDP */
921 + nla_total_size(4) /* IFLA_EVENT */
922 + nla_total_size(4) /* IFLA_NEW_NETNSID */
923 + nla_total_size(1) /* IFLA_PROTO_DOWN */
924 + nla_total_size(4) /* IFLA_IF_NETNSID */
925 + 0;
926 }
927
928 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
929 {
930 struct nlattr *vf_ports;
931 struct nlattr *vf_port;
932 int vf;
933 int err;
934
935 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
936 if (!vf_ports)
937 return -EMSGSIZE;
938
939 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
940 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
941 if (!vf_port)
942 goto nla_put_failure;
943 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
944 goto nla_put_failure;
945 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
946 if (err == -EMSGSIZE)
947 goto nla_put_failure;
948 if (err) {
949 nla_nest_cancel(skb, vf_port);
950 continue;
951 }
952 nla_nest_end(skb, vf_port);
953 }
954
955 nla_nest_end(skb, vf_ports);
956
957 return 0;
958
959 nla_put_failure:
960 nla_nest_cancel(skb, vf_ports);
961 return -EMSGSIZE;
962 }
963
964 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
965 {
966 struct nlattr *port_self;
967 int err;
968
969 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
970 if (!port_self)
971 return -EMSGSIZE;
972
973 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
974 if (err) {
975 nla_nest_cancel(skb, port_self);
976 return (err == -EMSGSIZE) ? err : 0;
977 }
978
979 nla_nest_end(skb, port_self);
980
981 return 0;
982 }
983
984 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
985 u32 ext_filter_mask)
986 {
987 int err;
988
989 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
990 !(ext_filter_mask & RTEXT_FILTER_VF))
991 return 0;
992
993 err = rtnl_port_self_fill(skb, dev);
994 if (err)
995 return err;
996
997 if (dev_num_vf(dev->dev.parent)) {
998 err = rtnl_vf_ports_fill(skb, dev);
999 if (err)
1000 return err;
1001 }
1002
1003 return 0;
1004 }
1005
1006 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1007 {
1008 int err;
1009 struct netdev_phys_item_id ppid;
1010
1011 err = dev_get_phys_port_id(dev, &ppid);
1012 if (err) {
1013 if (err == -EOPNOTSUPP)
1014 return 0;
1015 return err;
1016 }
1017
1018 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1019 return -EMSGSIZE;
1020
1021 return 0;
1022 }
1023
1024 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1025 {
1026 char name[IFNAMSIZ];
1027 int err;
1028
1029 err = dev_get_phys_port_name(dev, name, sizeof(name));
1030 if (err) {
1031 if (err == -EOPNOTSUPP)
1032 return 0;
1033 return err;
1034 }
1035
1036 if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1037 return -EMSGSIZE;
1038
1039 return 0;
1040 }
1041
1042 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1043 {
1044 int err;
1045 struct switchdev_attr attr = {
1046 .orig_dev = dev,
1047 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1048 .flags = SWITCHDEV_F_NO_RECURSE,
1049 };
1050
1051 err = switchdev_port_attr_get(dev, &attr);
1052 if (err) {
1053 if (err == -EOPNOTSUPP)
1054 return 0;
1055 return err;
1056 }
1057
1058 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1059 attr.u.ppid.id))
1060 return -EMSGSIZE;
1061
1062 return 0;
1063 }
1064
1065 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1066 struct net_device *dev)
1067 {
1068 struct rtnl_link_stats64 *sp;
1069 struct nlattr *attr;
1070
1071 attr = nla_reserve_64bit(skb, IFLA_STATS64,
1072 sizeof(struct rtnl_link_stats64), IFLA_PAD);
1073 if (!attr)
1074 return -EMSGSIZE;
1075
1076 sp = nla_data(attr);
1077 dev_get_stats(dev, sp);
1078
1079 attr = nla_reserve(skb, IFLA_STATS,
1080 sizeof(struct rtnl_link_stats));
1081 if (!attr)
1082 return -EMSGSIZE;
1083
1084 copy_rtnl_link_stats(nla_data(attr), sp);
1085
1086 return 0;
1087 }
1088
1089 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1090 struct net_device *dev,
1091 int vfs_num,
1092 struct nlattr *vfinfo)
1093 {
1094 struct ifla_vf_rss_query_en vf_rss_query_en;
1095 struct nlattr *vf, *vfstats, *vfvlanlist;
1096 struct ifla_vf_link_state vf_linkstate;
1097 struct ifla_vf_vlan_info vf_vlan_info;
1098 struct ifla_vf_spoofchk vf_spoofchk;
1099 struct ifla_vf_tx_rate vf_tx_rate;
1100 struct ifla_vf_stats vf_stats;
1101 struct ifla_vf_trust vf_trust;
1102 struct ifla_vf_vlan vf_vlan;
1103 struct ifla_vf_rate vf_rate;
1104 struct ifla_vf_mac vf_mac;
1105 struct ifla_vf_info ivi;
1106
1107 memset(&ivi, 0, sizeof(ivi));
1108
1109 /* Not all SR-IOV capable drivers support the
1110 * spoofcheck and "RSS query enable" query. Preset to
1111 * -1 so the user space tool can detect that the driver
1112 * didn't report anything.
1113 */
1114 ivi.spoofchk = -1;
1115 ivi.rss_query_en = -1;
1116 ivi.trusted = -1;
1117 /* The default value for VF link state is "auto"
1118 * IFLA_VF_LINK_STATE_AUTO which equals zero
1119 */
1120 ivi.linkstate = 0;
1121 /* VLAN Protocol by default is 802.1Q */
1122 ivi.vlan_proto = htons(ETH_P_8021Q);
1123 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1124 return 0;
1125
1126 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1127
1128 vf_mac.vf =
1129 vf_vlan.vf =
1130 vf_vlan_info.vf =
1131 vf_rate.vf =
1132 vf_tx_rate.vf =
1133 vf_spoofchk.vf =
1134 vf_linkstate.vf =
1135 vf_rss_query_en.vf =
1136 vf_trust.vf = ivi.vf;
1137
1138 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1139 vf_vlan.vlan = ivi.vlan;
1140 vf_vlan.qos = ivi.qos;
1141 vf_vlan_info.vlan = ivi.vlan;
1142 vf_vlan_info.qos = ivi.qos;
1143 vf_vlan_info.vlan_proto = ivi.vlan_proto;
1144 vf_tx_rate.rate = ivi.max_tx_rate;
1145 vf_rate.min_tx_rate = ivi.min_tx_rate;
1146 vf_rate.max_tx_rate = ivi.max_tx_rate;
1147 vf_spoofchk.setting = ivi.spoofchk;
1148 vf_linkstate.link_state = ivi.linkstate;
1149 vf_rss_query_en.setting = ivi.rss_query_en;
1150 vf_trust.setting = ivi.trusted;
1151 vf = nla_nest_start(skb, IFLA_VF_INFO);
1152 if (!vf)
1153 goto nla_put_vfinfo_failure;
1154 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1155 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1156 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1157 &vf_rate) ||
1158 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1159 &vf_tx_rate) ||
1160 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1161 &vf_spoofchk) ||
1162 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1163 &vf_linkstate) ||
1164 nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1165 sizeof(vf_rss_query_en),
1166 &vf_rss_query_en) ||
1167 nla_put(skb, IFLA_VF_TRUST,
1168 sizeof(vf_trust), &vf_trust))
1169 goto nla_put_vf_failure;
1170 vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST);
1171 if (!vfvlanlist)
1172 goto nla_put_vf_failure;
1173 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1174 &vf_vlan_info)) {
1175 nla_nest_cancel(skb, vfvlanlist);
1176 goto nla_put_vf_failure;
1177 }
1178 nla_nest_end(skb, vfvlanlist);
1179 memset(&vf_stats, 0, sizeof(vf_stats));
1180 if (dev->netdev_ops->ndo_get_vf_stats)
1181 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1182 &vf_stats);
1183 vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1184 if (!vfstats)
1185 goto nla_put_vf_failure;
1186 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1187 vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1188 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1189 vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1190 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1191 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1192 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1193 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1194 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1195 vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1196 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1197 vf_stats.multicast, IFLA_VF_STATS_PAD)) {
1198 nla_nest_cancel(skb, vfstats);
1199 goto nla_put_vf_failure;
1200 }
1201 nla_nest_end(skb, vfstats);
1202 nla_nest_end(skb, vf);
1203 return 0;
1204
1205 nla_put_vf_failure:
1206 nla_nest_cancel(skb, vf);
1207 nla_put_vfinfo_failure:
1208 nla_nest_cancel(skb, vfinfo);
1209 return -EMSGSIZE;
1210 }
1211
1212 static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1213 struct net_device *dev,
1214 u32 ext_filter_mask)
1215 {
1216 struct nlattr *vfinfo;
1217 int i, num_vfs;
1218
1219 if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1220 return 0;
1221
1222 num_vfs = dev_num_vf(dev->dev.parent);
1223 if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1224 return -EMSGSIZE;
1225
1226 if (!dev->netdev_ops->ndo_get_vf_config)
1227 return 0;
1228
1229 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1230 if (!vfinfo)
1231 return -EMSGSIZE;
1232
1233 for (i = 0; i < num_vfs; i++) {
1234 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1235 return -EMSGSIZE;
1236 }
1237
1238 nla_nest_end(skb, vfinfo);
1239 return 0;
1240 }
1241
1242 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1243 {
1244 struct rtnl_link_ifmap map;
1245
1246 memset(&map, 0, sizeof(map));
1247 map.mem_start = dev->mem_start;
1248 map.mem_end = dev->mem_end;
1249 map.base_addr = dev->base_addr;
1250 map.irq = dev->irq;
1251 map.dma = dev->dma;
1252 map.port = dev->if_port;
1253
1254 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1255 return -EMSGSIZE;
1256
1257 return 0;
1258 }
1259
1260 static u8 rtnl_xdp_attached_mode(struct net_device *dev, u32 *prog_id)
1261 {
1262 const struct net_device_ops *ops = dev->netdev_ops;
1263 const struct bpf_prog *generic_xdp_prog;
1264
1265 ASSERT_RTNL();
1266
1267 *prog_id = 0;
1268 generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1269 if (generic_xdp_prog) {
1270 *prog_id = generic_xdp_prog->aux->id;
1271 return XDP_ATTACHED_SKB;
1272 }
1273 if (!ops->ndo_bpf)
1274 return XDP_ATTACHED_NONE;
1275
1276 return __dev_xdp_attached(dev, ops->ndo_bpf, prog_id);
1277 }
1278
1279 static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1280 {
1281 struct nlattr *xdp;
1282 u32 prog_id;
1283 int err;
1284
1285 xdp = nla_nest_start(skb, IFLA_XDP);
1286 if (!xdp)
1287 return -EMSGSIZE;
1288
1289 err = nla_put_u8(skb, IFLA_XDP_ATTACHED,
1290 rtnl_xdp_attached_mode(dev, &prog_id));
1291 if (err)
1292 goto err_cancel;
1293
1294 if (prog_id) {
1295 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1296 if (err)
1297 goto err_cancel;
1298 }
1299
1300 nla_nest_end(skb, xdp);
1301 return 0;
1302
1303 err_cancel:
1304 nla_nest_cancel(skb, xdp);
1305 return err;
1306 }
1307
1308 static u32 rtnl_get_event(unsigned long event)
1309 {
1310 u32 rtnl_event_type = IFLA_EVENT_NONE;
1311
1312 switch (event) {
1313 case NETDEV_REBOOT:
1314 rtnl_event_type = IFLA_EVENT_REBOOT;
1315 break;
1316 case NETDEV_FEAT_CHANGE:
1317 rtnl_event_type = IFLA_EVENT_FEATURES;
1318 break;
1319 case NETDEV_BONDING_FAILOVER:
1320 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1321 break;
1322 case NETDEV_NOTIFY_PEERS:
1323 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1324 break;
1325 case NETDEV_RESEND_IGMP:
1326 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1327 break;
1328 case NETDEV_CHANGEINFODATA:
1329 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1330 break;
1331 default:
1332 break;
1333 }
1334
1335 return rtnl_event_type;
1336 }
1337
1338 static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1339 {
1340 const struct net_device *upper_dev;
1341 int ret = 0;
1342
1343 rcu_read_lock();
1344
1345 upper_dev = netdev_master_upper_dev_get_rcu(dev);
1346 if (upper_dev)
1347 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1348
1349 rcu_read_unlock();
1350 return ret;
1351 }
1352
1353 static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev)
1354 {
1355 int ifindex = dev_get_iflink(dev);
1356
1357 if (dev->ifindex == ifindex)
1358 return 0;
1359
1360 return nla_put_u32(skb, IFLA_LINK, ifindex);
1361 }
1362
1363 static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1364 struct net_device *dev)
1365 {
1366 char buf[IFALIASZ];
1367 int ret;
1368
1369 ret = dev_get_alias(dev, buf, sizeof(buf));
1370 return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1371 }
1372
1373 static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1374 const struct net_device *dev,
1375 struct net *src_net)
1376 {
1377 if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1378 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1379
1380 if (!net_eq(dev_net(dev), link_net)) {
1381 int id = peernet2id_alloc(src_net, link_net);
1382
1383 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1384 return -EMSGSIZE;
1385 }
1386 }
1387
1388 return 0;
1389 }
1390
1391 static int rtnl_fill_link_af(struct sk_buff *skb,
1392 const struct net_device *dev,
1393 u32 ext_filter_mask)
1394 {
1395 const struct rtnl_af_ops *af_ops;
1396 struct nlattr *af_spec;
1397
1398 af_spec = nla_nest_start(skb, IFLA_AF_SPEC);
1399 if (!af_spec)
1400 return -EMSGSIZE;
1401
1402 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1403 struct nlattr *af;
1404 int err;
1405
1406 if (!af_ops->fill_link_af)
1407 continue;
1408
1409 af = nla_nest_start(skb, af_ops->family);
1410 if (!af)
1411 return -EMSGSIZE;
1412
1413 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1414 /*
1415 * Caller may return ENODATA to indicate that there
1416 * was no data to be dumped. This is not an error, it
1417 * means we should trim the attribute header and
1418 * continue.
1419 */
1420 if (err == -ENODATA)
1421 nla_nest_cancel(skb, af);
1422 else if (err < 0)
1423 return -EMSGSIZE;
1424
1425 nla_nest_end(skb, af);
1426 }
1427
1428 nla_nest_end(skb, af_spec);
1429 return 0;
1430 }
1431
1432 static int rtnl_fill_ifinfo(struct sk_buff *skb,
1433 struct net_device *dev, struct net *src_net,
1434 int type, u32 pid, u32 seq, u32 change,
1435 unsigned int flags, u32 ext_filter_mask,
1436 u32 event, int *new_nsid, int tgt_netnsid)
1437 {
1438 struct ifinfomsg *ifm;
1439 struct nlmsghdr *nlh;
1440
1441 ASSERT_RTNL();
1442 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1443 if (nlh == NULL)
1444 return -EMSGSIZE;
1445
1446 ifm = nlmsg_data(nlh);
1447 ifm->ifi_family = AF_UNSPEC;
1448 ifm->__ifi_pad = 0;
1449 ifm->ifi_type = dev->type;
1450 ifm->ifi_index = dev->ifindex;
1451 ifm->ifi_flags = dev_get_flags(dev);
1452 ifm->ifi_change = change;
1453
1454 if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_IF_NETNSID, tgt_netnsid))
1455 goto nla_put_failure;
1456
1457 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1458 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1459 nla_put_u8(skb, IFLA_OPERSTATE,
1460 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1461 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1462 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1463 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1464 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1465 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1466 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1467 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1468 #ifdef CONFIG_RPS
1469 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1470 #endif
1471 nla_put_iflink(skb, dev) ||
1472 put_master_ifindex(skb, dev) ||
1473 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1474 (dev->qdisc &&
1475 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1476 nla_put_ifalias(skb, dev) ||
1477 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1478 atomic_read(&dev->carrier_changes)) ||
1479 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1480 goto nla_put_failure;
1481
1482 if (event != IFLA_EVENT_NONE) {
1483 if (nla_put_u32(skb, IFLA_EVENT, event))
1484 goto nla_put_failure;
1485 }
1486
1487 if (rtnl_fill_link_ifmap(skb, dev))
1488 goto nla_put_failure;
1489
1490 if (dev->addr_len) {
1491 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1492 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1493 goto nla_put_failure;
1494 }
1495
1496 if (rtnl_phys_port_id_fill(skb, dev))
1497 goto nla_put_failure;
1498
1499 if (rtnl_phys_port_name_fill(skb, dev))
1500 goto nla_put_failure;
1501
1502 if (rtnl_phys_switch_id_fill(skb, dev))
1503 goto nla_put_failure;
1504
1505 if (rtnl_fill_stats(skb, dev))
1506 goto nla_put_failure;
1507
1508 if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1509 goto nla_put_failure;
1510
1511 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1512 goto nla_put_failure;
1513
1514 if (rtnl_xdp_fill(skb, dev))
1515 goto nla_put_failure;
1516
1517 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1518 if (rtnl_link_fill(skb, dev) < 0)
1519 goto nla_put_failure;
1520 }
1521
1522 if (rtnl_fill_link_netnsid(skb, dev, src_net))
1523 goto nla_put_failure;
1524
1525 if (new_nsid &&
1526 nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1527 goto nla_put_failure;
1528
1529 rcu_read_lock();
1530 if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1531 goto nla_put_failure_rcu;
1532 rcu_read_unlock();
1533
1534 nlmsg_end(skb, nlh);
1535 return 0;
1536
1537 nla_put_failure_rcu:
1538 rcu_read_unlock();
1539 nla_put_failure:
1540 nlmsg_cancel(skb, nlh);
1541 return -EMSGSIZE;
1542 }
1543
1544 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1545 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1546 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1547 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1548 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1549 [IFLA_MTU] = { .type = NLA_U32 },
1550 [IFLA_LINK] = { .type = NLA_U32 },
1551 [IFLA_MASTER] = { .type = NLA_U32 },
1552 [IFLA_CARRIER] = { .type = NLA_U8 },
1553 [IFLA_TXQLEN] = { .type = NLA_U32 },
1554 [IFLA_WEIGHT] = { .type = NLA_U32 },
1555 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1556 [IFLA_LINKMODE] = { .type = NLA_U8 },
1557 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1558 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1559 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1560 /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1561 * allow 0-length string (needed to remove an alias).
1562 */
1563 [IFLA_IFALIAS] = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1564 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1565 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1566 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1567 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1568 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1569 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1570 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1571 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1572 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1573 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1574 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1575 [IFLA_LINK_NETNSID] = { .type = NLA_S32 },
1576 [IFLA_PROTO_DOWN] = { .type = NLA_U8 },
1577 [IFLA_XDP] = { .type = NLA_NESTED },
1578 [IFLA_EVENT] = { .type = NLA_U32 },
1579 [IFLA_GROUP] = { .type = NLA_U32 },
1580 [IFLA_IF_NETNSID] = { .type = NLA_S32 },
1581 };
1582
1583 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1584 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1585 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1586 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1587 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1588 };
1589
1590 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1591 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
1592 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
1593 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED },
1594 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
1595 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
1596 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) },
1597 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) },
1598 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) },
1599 [IFLA_VF_STATS] = { .type = NLA_NESTED },
1600 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) },
1601 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) },
1602 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) },
1603 };
1604
1605 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1606 [IFLA_PORT_VF] = { .type = NLA_U32 },
1607 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1608 .len = PORT_PROFILE_MAX },
1609 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1610 .len = PORT_UUID_MAX },
1611 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1612 .len = PORT_UUID_MAX },
1613 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1614 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1615
1616 /* Unused, but we need to keep it here since user space could
1617 * fill it. It's also broken with regard to NLA_BINARY use in
1618 * combination with structs.
1619 */
1620 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1621 .len = sizeof(struct ifla_port_vsi) },
1622 };
1623
1624 static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1625 [IFLA_XDP_FD] = { .type = NLA_S32 },
1626 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 },
1627 [IFLA_XDP_FLAGS] = { .type = NLA_U32 },
1628 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 },
1629 };
1630
1631 static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1632 {
1633 const struct rtnl_link_ops *ops = NULL;
1634 struct nlattr *linfo[IFLA_INFO_MAX + 1];
1635
1636 if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla,
1637 ifla_info_policy, NULL) < 0)
1638 return NULL;
1639
1640 if (linfo[IFLA_INFO_KIND]) {
1641 char kind[MODULE_NAME_LEN];
1642
1643 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1644 ops = rtnl_link_ops_get(kind);
1645 }
1646
1647 return ops;
1648 }
1649
1650 static bool link_master_filtered(struct net_device *dev, int master_idx)
1651 {
1652 struct net_device *master;
1653
1654 if (!master_idx)
1655 return false;
1656
1657 master = netdev_master_upper_dev_get(dev);
1658 if (!master || master->ifindex != master_idx)
1659 return true;
1660
1661 return false;
1662 }
1663
1664 static bool link_kind_filtered(const struct net_device *dev,
1665 const struct rtnl_link_ops *kind_ops)
1666 {
1667 if (kind_ops && dev->rtnl_link_ops != kind_ops)
1668 return true;
1669
1670 return false;
1671 }
1672
1673 static bool link_dump_filtered(struct net_device *dev,
1674 int master_idx,
1675 const struct rtnl_link_ops *kind_ops)
1676 {
1677 if (link_master_filtered(dev, master_idx) ||
1678 link_kind_filtered(dev, kind_ops))
1679 return true;
1680
1681 return false;
1682 }
1683
1684 static struct net *get_target_net(struct sock *sk, int netnsid)
1685 {
1686 struct net *net;
1687
1688 net = get_net_ns_by_id(sock_net(sk), netnsid);
1689 if (!net)
1690 return ERR_PTR(-EINVAL);
1691
1692 /* For now, the caller is required to have CAP_NET_ADMIN in
1693 * the user namespace owning the target net ns.
1694 */
1695 if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
1696 put_net(net);
1697 return ERR_PTR(-EACCES);
1698 }
1699 return net;
1700 }
1701
1702 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1703 {
1704 struct net *net = sock_net(skb->sk);
1705 struct net *tgt_net = net;
1706 int h, s_h;
1707 int idx = 0, s_idx;
1708 struct net_device *dev;
1709 struct hlist_head *head;
1710 struct nlattr *tb[IFLA_MAX+1];
1711 u32 ext_filter_mask = 0;
1712 const struct rtnl_link_ops *kind_ops = NULL;
1713 unsigned int flags = NLM_F_MULTI;
1714 int master_idx = 0;
1715 int netnsid = -1;
1716 int err;
1717 int hdrlen;
1718
1719 s_h = cb->args[0];
1720 s_idx = cb->args[1];
1721
1722 /* A hack to preserve kernel<->userspace interface.
1723 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1724 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1725 * what iproute2 < v3.9.0 used.
1726 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1727 * attribute, its netlink message is shorter than struct ifinfomsg.
1728 */
1729 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1730 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1731
1732 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX,
1733 ifla_policy, NULL) >= 0) {
1734 if (tb[IFLA_IF_NETNSID]) {
1735 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
1736 tgt_net = get_target_net(skb->sk, netnsid);
1737 if (IS_ERR(tgt_net)) {
1738 tgt_net = net;
1739 netnsid = -1;
1740 }
1741 }
1742
1743 if (tb[IFLA_EXT_MASK])
1744 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1745
1746 if (tb[IFLA_MASTER])
1747 master_idx = nla_get_u32(tb[IFLA_MASTER]);
1748
1749 if (tb[IFLA_LINKINFO])
1750 kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1751
1752 if (master_idx || kind_ops)
1753 flags |= NLM_F_DUMP_FILTERED;
1754 }
1755
1756 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1757 idx = 0;
1758 head = &tgt_net->dev_index_head[h];
1759 hlist_for_each_entry(dev, head, index_hlist) {
1760 if (link_dump_filtered(dev, master_idx, kind_ops))
1761 goto cont;
1762 if (idx < s_idx)
1763 goto cont;
1764 err = rtnl_fill_ifinfo(skb, dev, net,
1765 RTM_NEWLINK,
1766 NETLINK_CB(cb->skb).portid,
1767 cb->nlh->nlmsg_seq, 0,
1768 flags,
1769 ext_filter_mask, 0, NULL,
1770 netnsid);
1771
1772 if (err < 0) {
1773 if (likely(skb->len))
1774 goto out;
1775
1776 goto out_err;
1777 }
1778 cont:
1779 idx++;
1780 }
1781 }
1782 out:
1783 err = skb->len;
1784 out_err:
1785 cb->args[1] = idx;
1786 cb->args[0] = h;
1787 cb->seq = net->dev_base_seq;
1788 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1789 if (netnsid >= 0)
1790 put_net(tgt_net);
1791
1792 return err;
1793 }
1794
1795 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
1796 struct netlink_ext_ack *exterr)
1797 {
1798 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy, exterr);
1799 }
1800 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1801
1802 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1803 {
1804 struct net *net;
1805 /* Examine the link attributes and figure out which
1806 * network namespace we are talking about.
1807 */
1808 if (tb[IFLA_NET_NS_PID])
1809 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1810 else if (tb[IFLA_NET_NS_FD])
1811 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1812 else
1813 net = get_net(src_net);
1814 return net;
1815 }
1816 EXPORT_SYMBOL(rtnl_link_get_net);
1817
1818 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1819 {
1820 if (dev) {
1821 if (tb[IFLA_ADDRESS] &&
1822 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1823 return -EINVAL;
1824
1825 if (tb[IFLA_BROADCAST] &&
1826 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1827 return -EINVAL;
1828 }
1829
1830 if (tb[IFLA_AF_SPEC]) {
1831 struct nlattr *af;
1832 int rem, err;
1833
1834 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1835 const struct rtnl_af_ops *af_ops;
1836
1837 rcu_read_lock();
1838 af_ops = rtnl_af_lookup(nla_type(af));
1839 if (!af_ops) {
1840 rcu_read_unlock();
1841 return -EAFNOSUPPORT;
1842 }
1843
1844 if (!af_ops->set_link_af) {
1845 rcu_read_unlock();
1846 return -EOPNOTSUPP;
1847 }
1848
1849 if (af_ops->validate_link_af) {
1850 err = af_ops->validate_link_af(dev, af);
1851 if (err < 0) {
1852 rcu_read_unlock();
1853 return err;
1854 }
1855 }
1856
1857 rcu_read_unlock();
1858 }
1859 }
1860
1861 return 0;
1862 }
1863
1864 static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
1865 int guid_type)
1866 {
1867 const struct net_device_ops *ops = dev->netdev_ops;
1868
1869 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
1870 }
1871
1872 static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
1873 {
1874 if (dev->type != ARPHRD_INFINIBAND)
1875 return -EOPNOTSUPP;
1876
1877 return handle_infiniband_guid(dev, ivt, guid_type);
1878 }
1879
1880 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1881 {
1882 const struct net_device_ops *ops = dev->netdev_ops;
1883 int err = -EINVAL;
1884
1885 if (tb[IFLA_VF_MAC]) {
1886 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1887
1888 err = -EOPNOTSUPP;
1889 if (ops->ndo_set_vf_mac)
1890 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1891 ivm->mac);
1892 if (err < 0)
1893 return err;
1894 }
1895
1896 if (tb[IFLA_VF_VLAN]) {
1897 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1898
1899 err = -EOPNOTSUPP;
1900 if (ops->ndo_set_vf_vlan)
1901 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1902 ivv->qos,
1903 htons(ETH_P_8021Q));
1904 if (err < 0)
1905 return err;
1906 }
1907
1908 if (tb[IFLA_VF_VLAN_LIST]) {
1909 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
1910 struct nlattr *attr;
1911 int rem, len = 0;
1912
1913 err = -EOPNOTSUPP;
1914 if (!ops->ndo_set_vf_vlan)
1915 return err;
1916
1917 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
1918 if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
1919 nla_len(attr) < NLA_HDRLEN) {
1920 return -EINVAL;
1921 }
1922 if (len >= MAX_VLAN_LIST_LEN)
1923 return -EOPNOTSUPP;
1924 ivvl[len] = nla_data(attr);
1925
1926 len++;
1927 }
1928 if (len == 0)
1929 return -EINVAL;
1930
1931 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
1932 ivvl[0]->qos, ivvl[0]->vlan_proto);
1933 if (err < 0)
1934 return err;
1935 }
1936
1937 if (tb[IFLA_VF_TX_RATE]) {
1938 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1939 struct ifla_vf_info ivf;
1940
1941 err = -EOPNOTSUPP;
1942 if (ops->ndo_get_vf_config)
1943 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1944 if (err < 0)
1945 return err;
1946
1947 err = -EOPNOTSUPP;
1948 if (ops->ndo_set_vf_rate)
1949 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1950 ivf.min_tx_rate,
1951 ivt->rate);
1952 if (err < 0)
1953 return err;
1954 }
1955
1956 if (tb[IFLA_VF_RATE]) {
1957 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1958
1959 err = -EOPNOTSUPP;
1960 if (ops->ndo_set_vf_rate)
1961 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1962 ivt->min_tx_rate,
1963 ivt->max_tx_rate);
1964 if (err < 0)
1965 return err;
1966 }
1967
1968 if (tb[IFLA_VF_SPOOFCHK]) {
1969 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1970
1971 err = -EOPNOTSUPP;
1972 if (ops->ndo_set_vf_spoofchk)
1973 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1974 ivs->setting);
1975 if (err < 0)
1976 return err;
1977 }
1978
1979 if (tb[IFLA_VF_LINK_STATE]) {
1980 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1981
1982 err = -EOPNOTSUPP;
1983 if (ops->ndo_set_vf_link_state)
1984 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1985 ivl->link_state);
1986 if (err < 0)
1987 return err;
1988 }
1989
1990 if (tb[IFLA_VF_RSS_QUERY_EN]) {
1991 struct ifla_vf_rss_query_en *ivrssq_en;
1992
1993 err = -EOPNOTSUPP;
1994 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1995 if (ops->ndo_set_vf_rss_query_en)
1996 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1997 ivrssq_en->setting);
1998 if (err < 0)
1999 return err;
2000 }
2001
2002 if (tb[IFLA_VF_TRUST]) {
2003 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2004
2005 err = -EOPNOTSUPP;
2006 if (ops->ndo_set_vf_trust)
2007 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2008 if (err < 0)
2009 return err;
2010 }
2011
2012 if (tb[IFLA_VF_IB_NODE_GUID]) {
2013 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2014
2015 if (!ops->ndo_set_vf_guid)
2016 return -EOPNOTSUPP;
2017
2018 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2019 }
2020
2021 if (tb[IFLA_VF_IB_PORT_GUID]) {
2022 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2023
2024 if (!ops->ndo_set_vf_guid)
2025 return -EOPNOTSUPP;
2026
2027 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2028 }
2029
2030 return err;
2031 }
2032
2033 static int do_set_master(struct net_device *dev, int ifindex,
2034 struct netlink_ext_ack *extack)
2035 {
2036 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2037 const struct net_device_ops *ops;
2038 int err;
2039
2040 if (upper_dev) {
2041 if (upper_dev->ifindex == ifindex)
2042 return 0;
2043 ops = upper_dev->netdev_ops;
2044 if (ops->ndo_del_slave) {
2045 err = ops->ndo_del_slave(upper_dev, dev);
2046 if (err)
2047 return err;
2048 } else {
2049 return -EOPNOTSUPP;
2050 }
2051 }
2052
2053 if (ifindex) {
2054 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2055 if (!upper_dev)
2056 return -EINVAL;
2057 ops = upper_dev->netdev_ops;
2058 if (ops->ndo_add_slave) {
2059 err = ops->ndo_add_slave(upper_dev, dev, extack);
2060 if (err)
2061 return err;
2062 } else {
2063 return -EOPNOTSUPP;
2064 }
2065 }
2066 return 0;
2067 }
2068
2069 #define DO_SETLINK_MODIFIED 0x01
2070 /* notify flag means notify + modified. */
2071 #define DO_SETLINK_NOTIFY 0x03
2072 static int do_setlink(const struct sk_buff *skb,
2073 struct net_device *dev, struct ifinfomsg *ifm,
2074 struct netlink_ext_ack *extack,
2075 struct nlattr **tb, char *ifname, int status)
2076 {
2077 const struct net_device_ops *ops = dev->netdev_ops;
2078 int err;
2079
2080 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
2081 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
2082 if (IS_ERR(net)) {
2083 err = PTR_ERR(net);
2084 goto errout;
2085 }
2086 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
2087 put_net(net);
2088 err = -EPERM;
2089 goto errout;
2090 }
2091 err = dev_change_net_namespace(dev, net, ifname);
2092 put_net(net);
2093 if (err)
2094 goto errout;
2095 status |= DO_SETLINK_MODIFIED;
2096 }
2097
2098 if (tb[IFLA_MAP]) {
2099 struct rtnl_link_ifmap *u_map;
2100 struct ifmap k_map;
2101
2102 if (!ops->ndo_set_config) {
2103 err = -EOPNOTSUPP;
2104 goto errout;
2105 }
2106
2107 if (!netif_device_present(dev)) {
2108 err = -ENODEV;
2109 goto errout;
2110 }
2111
2112 u_map = nla_data(tb[IFLA_MAP]);
2113 k_map.mem_start = (unsigned long) u_map->mem_start;
2114 k_map.mem_end = (unsigned long) u_map->mem_end;
2115 k_map.base_addr = (unsigned short) u_map->base_addr;
2116 k_map.irq = (unsigned char) u_map->irq;
2117 k_map.dma = (unsigned char) u_map->dma;
2118 k_map.port = (unsigned char) u_map->port;
2119
2120 err = ops->ndo_set_config(dev, &k_map);
2121 if (err < 0)
2122 goto errout;
2123
2124 status |= DO_SETLINK_NOTIFY;
2125 }
2126
2127 if (tb[IFLA_ADDRESS]) {
2128 struct sockaddr *sa;
2129 int len;
2130
2131 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2132 sizeof(*sa));
2133 sa = kmalloc(len, GFP_KERNEL);
2134 if (!sa) {
2135 err = -ENOMEM;
2136 goto errout;
2137 }
2138 sa->sa_family = dev->type;
2139 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2140 dev->addr_len);
2141 err = dev_set_mac_address(dev, sa);
2142 kfree(sa);
2143 if (err)
2144 goto errout;
2145 status |= DO_SETLINK_MODIFIED;
2146 }
2147
2148 if (tb[IFLA_MTU]) {
2149 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2150 if (err < 0)
2151 goto errout;
2152 status |= DO_SETLINK_MODIFIED;
2153 }
2154
2155 if (tb[IFLA_GROUP]) {
2156 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2157 status |= DO_SETLINK_NOTIFY;
2158 }
2159
2160 /*
2161 * Interface selected by interface index but interface
2162 * name provided implies that a name change has been
2163 * requested.
2164 */
2165 if (ifm->ifi_index > 0 && ifname[0]) {
2166 err = dev_change_name(dev, ifname);
2167 if (err < 0)
2168 goto errout;
2169 status |= DO_SETLINK_MODIFIED;
2170 }
2171
2172 if (tb[IFLA_IFALIAS]) {
2173 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2174 nla_len(tb[IFLA_IFALIAS]));
2175 if (err < 0)
2176 goto errout;
2177 status |= DO_SETLINK_NOTIFY;
2178 }
2179
2180 if (tb[IFLA_BROADCAST]) {
2181 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2182 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2183 }
2184
2185 if (ifm->ifi_flags || ifm->ifi_change) {
2186 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2187 if (err < 0)
2188 goto errout;
2189 }
2190
2191 if (tb[IFLA_MASTER]) {
2192 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2193 if (err)
2194 goto errout;
2195 status |= DO_SETLINK_MODIFIED;
2196 }
2197
2198 if (tb[IFLA_CARRIER]) {
2199 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2200 if (err)
2201 goto errout;
2202 status |= DO_SETLINK_MODIFIED;
2203 }
2204
2205 if (tb[IFLA_TXQLEN]) {
2206 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2207 unsigned int orig_len = dev->tx_queue_len;
2208
2209 if (dev->tx_queue_len ^ value) {
2210 dev->tx_queue_len = value;
2211 err = call_netdevice_notifiers(
2212 NETDEV_CHANGE_TX_QUEUE_LEN, dev);
2213 err = notifier_to_errno(err);
2214 if (err) {
2215 dev->tx_queue_len = orig_len;
2216 goto errout;
2217 }
2218 status |= DO_SETLINK_MODIFIED;
2219 }
2220 }
2221
2222 if (tb[IFLA_OPERSTATE])
2223 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2224
2225 if (tb[IFLA_LINKMODE]) {
2226 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2227
2228 write_lock_bh(&dev_base_lock);
2229 if (dev->link_mode ^ value)
2230 status |= DO_SETLINK_NOTIFY;
2231 dev->link_mode = value;
2232 write_unlock_bh(&dev_base_lock);
2233 }
2234
2235 if (tb[IFLA_VFINFO_LIST]) {
2236 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2237 struct nlattr *attr;
2238 int rem;
2239
2240 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2241 if (nla_type(attr) != IFLA_VF_INFO ||
2242 nla_len(attr) < NLA_HDRLEN) {
2243 err = -EINVAL;
2244 goto errout;
2245 }
2246 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2247 ifla_vf_policy, NULL);
2248 if (err < 0)
2249 goto errout;
2250 err = do_setvfinfo(dev, vfinfo);
2251 if (err < 0)
2252 goto errout;
2253 status |= DO_SETLINK_NOTIFY;
2254 }
2255 }
2256 err = 0;
2257
2258 if (tb[IFLA_VF_PORTS]) {
2259 struct nlattr *port[IFLA_PORT_MAX+1];
2260 struct nlattr *attr;
2261 int vf;
2262 int rem;
2263
2264 err = -EOPNOTSUPP;
2265 if (!ops->ndo_set_vf_port)
2266 goto errout;
2267
2268 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2269 if (nla_type(attr) != IFLA_VF_PORT ||
2270 nla_len(attr) < NLA_HDRLEN) {
2271 err = -EINVAL;
2272 goto errout;
2273 }
2274 err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2275 ifla_port_policy, NULL);
2276 if (err < 0)
2277 goto errout;
2278 if (!port[IFLA_PORT_VF]) {
2279 err = -EOPNOTSUPP;
2280 goto errout;
2281 }
2282 vf = nla_get_u32(port[IFLA_PORT_VF]);
2283 err = ops->ndo_set_vf_port(dev, vf, port);
2284 if (err < 0)
2285 goto errout;
2286 status |= DO_SETLINK_NOTIFY;
2287 }
2288 }
2289 err = 0;
2290
2291 if (tb[IFLA_PORT_SELF]) {
2292 struct nlattr *port[IFLA_PORT_MAX+1];
2293
2294 err = nla_parse_nested(port, IFLA_PORT_MAX,
2295 tb[IFLA_PORT_SELF], ifla_port_policy,
2296 NULL);
2297 if (err < 0)
2298 goto errout;
2299
2300 err = -EOPNOTSUPP;
2301 if (ops->ndo_set_vf_port)
2302 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2303 if (err < 0)
2304 goto errout;
2305 status |= DO_SETLINK_NOTIFY;
2306 }
2307
2308 if (tb[IFLA_AF_SPEC]) {
2309 struct nlattr *af;
2310 int rem;
2311
2312 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2313 const struct rtnl_af_ops *af_ops;
2314
2315 rcu_read_lock();
2316
2317 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2318
2319 err = af_ops->set_link_af(dev, af);
2320 if (err < 0) {
2321 rcu_read_unlock();
2322 goto errout;
2323 }
2324
2325 rcu_read_unlock();
2326 status |= DO_SETLINK_NOTIFY;
2327 }
2328 }
2329 err = 0;
2330
2331 if (tb[IFLA_PROTO_DOWN]) {
2332 err = dev_change_proto_down(dev,
2333 nla_get_u8(tb[IFLA_PROTO_DOWN]));
2334 if (err)
2335 goto errout;
2336 status |= DO_SETLINK_NOTIFY;
2337 }
2338
2339 if (tb[IFLA_XDP]) {
2340 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2341 u32 xdp_flags = 0;
2342
2343 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2344 ifla_xdp_policy, NULL);
2345 if (err < 0)
2346 goto errout;
2347
2348 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2349 err = -EINVAL;
2350 goto errout;
2351 }
2352
2353 if (xdp[IFLA_XDP_FLAGS]) {
2354 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2355 if (xdp_flags & ~XDP_FLAGS_MASK) {
2356 err = -EINVAL;
2357 goto errout;
2358 }
2359 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2360 err = -EINVAL;
2361 goto errout;
2362 }
2363 }
2364
2365 if (xdp[IFLA_XDP_FD]) {
2366 err = dev_change_xdp_fd(dev, extack,
2367 nla_get_s32(xdp[IFLA_XDP_FD]),
2368 xdp_flags);
2369 if (err)
2370 goto errout;
2371 status |= DO_SETLINK_NOTIFY;
2372 }
2373 }
2374
2375 errout:
2376 if (status & DO_SETLINK_MODIFIED) {
2377 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2378 netdev_state_change(dev);
2379
2380 if (err < 0)
2381 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",
2382 dev->name);
2383 }
2384
2385 return err;
2386 }
2387
2388 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2389 struct netlink_ext_ack *extack)
2390 {
2391 struct net *net = sock_net(skb->sk);
2392 struct ifinfomsg *ifm;
2393 struct net_device *dev;
2394 int err;
2395 struct nlattr *tb[IFLA_MAX+1];
2396 char ifname[IFNAMSIZ];
2397
2398 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy,
2399 extack);
2400 if (err < 0)
2401 goto errout;
2402
2403 if (tb[IFLA_IF_NETNSID])
2404 return -EOPNOTSUPP;
2405
2406 if (tb[IFLA_IFNAME])
2407 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2408 else
2409 ifname[0] = '\0';
2410
2411 err = -EINVAL;
2412 ifm = nlmsg_data(nlh);
2413 if (ifm->ifi_index > 0)
2414 dev = __dev_get_by_index(net, ifm->ifi_index);
2415 else if (tb[IFLA_IFNAME])
2416 dev = __dev_get_by_name(net, ifname);
2417 else
2418 goto errout;
2419
2420 if (dev == NULL) {
2421 err = -ENODEV;
2422 goto errout;
2423 }
2424
2425 err = validate_linkmsg(dev, tb);
2426 if (err < 0)
2427 goto errout;
2428
2429 err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2430 errout:
2431 return err;
2432 }
2433
2434 static int rtnl_group_dellink(const struct net *net, int group)
2435 {
2436 struct net_device *dev, *aux;
2437 LIST_HEAD(list_kill);
2438 bool found = false;
2439
2440 if (!group)
2441 return -EPERM;
2442
2443 for_each_netdev(net, dev) {
2444 if (dev->group == group) {
2445 const struct rtnl_link_ops *ops;
2446
2447 found = true;
2448 ops = dev->rtnl_link_ops;
2449 if (!ops || !ops->dellink)
2450 return -EOPNOTSUPP;
2451 }
2452 }
2453
2454 if (!found)
2455 return -ENODEV;
2456
2457 for_each_netdev_safe(net, dev, aux) {
2458 if (dev->group == group) {
2459 const struct rtnl_link_ops *ops;
2460
2461 ops = dev->rtnl_link_ops;
2462 ops->dellink(dev, &list_kill);
2463 }
2464 }
2465 unregister_netdevice_many(&list_kill);
2466
2467 return 0;
2468 }
2469
2470 int rtnl_delete_link(struct net_device *dev)
2471 {
2472 const struct rtnl_link_ops *ops;
2473 LIST_HEAD(list_kill);
2474
2475 ops = dev->rtnl_link_ops;
2476 if (!ops || !ops->dellink)
2477 return -EOPNOTSUPP;
2478
2479 ops->dellink(dev, &list_kill);
2480 unregister_netdevice_many(&list_kill);
2481
2482 return 0;
2483 }
2484 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2485
2486 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2487 struct netlink_ext_ack *extack)
2488 {
2489 struct net *net = sock_net(skb->sk);
2490 struct net_device *dev;
2491 struct ifinfomsg *ifm;
2492 char ifname[IFNAMSIZ];
2493 struct nlattr *tb[IFLA_MAX+1];
2494 int err;
2495
2496 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2497 if (err < 0)
2498 return err;
2499
2500 if (tb[IFLA_IF_NETNSID])
2501 return -EOPNOTSUPP;
2502
2503 if (tb[IFLA_IFNAME])
2504 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2505
2506 ifm = nlmsg_data(nlh);
2507 if (ifm->ifi_index > 0)
2508 dev = __dev_get_by_index(net, ifm->ifi_index);
2509 else if (tb[IFLA_IFNAME])
2510 dev = __dev_get_by_name(net, ifname);
2511 else if (tb[IFLA_GROUP])
2512 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2513 else
2514 return -EINVAL;
2515
2516 if (!dev)
2517 return -ENODEV;
2518
2519 return rtnl_delete_link(dev);
2520 }
2521
2522 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2523 {
2524 unsigned int old_flags;
2525 int err;
2526
2527 old_flags = dev->flags;
2528 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2529 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2530 if (err < 0)
2531 return err;
2532 }
2533
2534 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2535
2536 __dev_notify_flags(dev, old_flags, ~0U);
2537 return 0;
2538 }
2539 EXPORT_SYMBOL(rtnl_configure_link);
2540
2541 struct net_device *rtnl_create_link(struct net *net,
2542 const char *ifname, unsigned char name_assign_type,
2543 const struct rtnl_link_ops *ops, struct nlattr *tb[])
2544 {
2545 struct net_device *dev;
2546 unsigned int num_tx_queues = 1;
2547 unsigned int num_rx_queues = 1;
2548
2549 if (tb[IFLA_NUM_TX_QUEUES])
2550 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2551 else if (ops->get_num_tx_queues)
2552 num_tx_queues = ops->get_num_tx_queues();
2553
2554 if (tb[IFLA_NUM_RX_QUEUES])
2555 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2556 else if (ops->get_num_rx_queues)
2557 num_rx_queues = ops->get_num_rx_queues();
2558
2559 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2560 ops->setup, num_tx_queues, num_rx_queues);
2561 if (!dev)
2562 return ERR_PTR(-ENOMEM);
2563
2564 dev_net_set(dev, net);
2565 dev->rtnl_link_ops = ops;
2566 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2567
2568 if (tb[IFLA_MTU])
2569 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2570 if (tb[IFLA_ADDRESS]) {
2571 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2572 nla_len(tb[IFLA_ADDRESS]));
2573 dev->addr_assign_type = NET_ADDR_SET;
2574 }
2575 if (tb[IFLA_BROADCAST])
2576 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2577 nla_len(tb[IFLA_BROADCAST]));
2578 if (tb[IFLA_TXQLEN])
2579 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2580 if (tb[IFLA_OPERSTATE])
2581 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2582 if (tb[IFLA_LINKMODE])
2583 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2584 if (tb[IFLA_GROUP])
2585 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2586
2587 return dev;
2588 }
2589 EXPORT_SYMBOL(rtnl_create_link);
2590
2591 static int rtnl_group_changelink(const struct sk_buff *skb,
2592 struct net *net, int group,
2593 struct ifinfomsg *ifm,
2594 struct netlink_ext_ack *extack,
2595 struct nlattr **tb)
2596 {
2597 struct net_device *dev, *aux;
2598 int err;
2599
2600 for_each_netdev_safe(net, dev, aux) {
2601 if (dev->group == group) {
2602 err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
2603 if (err < 0)
2604 return err;
2605 }
2606 }
2607
2608 return 0;
2609 }
2610
2611 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2612 struct netlink_ext_ack *extack)
2613 {
2614 struct net *net = sock_net(skb->sk);
2615 const struct rtnl_link_ops *ops;
2616 const struct rtnl_link_ops *m_ops = NULL;
2617 struct net_device *dev;
2618 struct net_device *master_dev = NULL;
2619 struct ifinfomsg *ifm;
2620 char kind[MODULE_NAME_LEN];
2621 char ifname[IFNAMSIZ];
2622 struct nlattr *tb[IFLA_MAX+1];
2623 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2624 unsigned char name_assign_type = NET_NAME_USER;
2625 int err;
2626
2627 #ifdef CONFIG_MODULES
2628 replay:
2629 #endif
2630 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2631 if (err < 0)
2632 return err;
2633
2634 if (tb[IFLA_IF_NETNSID])
2635 return -EOPNOTSUPP;
2636
2637 if (tb[IFLA_IFNAME])
2638 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2639 else
2640 ifname[0] = '\0';
2641
2642 ifm = nlmsg_data(nlh);
2643 if (ifm->ifi_index > 0)
2644 dev = __dev_get_by_index(net, ifm->ifi_index);
2645 else {
2646 if (ifname[0])
2647 dev = __dev_get_by_name(net, ifname);
2648 else
2649 dev = NULL;
2650 }
2651
2652 if (dev) {
2653 master_dev = netdev_master_upper_dev_get(dev);
2654 if (master_dev)
2655 m_ops = master_dev->rtnl_link_ops;
2656 }
2657
2658 err = validate_linkmsg(dev, tb);
2659 if (err < 0)
2660 return err;
2661
2662 if (tb[IFLA_LINKINFO]) {
2663 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2664 tb[IFLA_LINKINFO], ifla_info_policy,
2665 NULL);
2666 if (err < 0)
2667 return err;
2668 } else
2669 memset(linkinfo, 0, sizeof(linkinfo));
2670
2671 if (linkinfo[IFLA_INFO_KIND]) {
2672 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2673 ops = rtnl_link_ops_get(kind);
2674 } else {
2675 kind[0] = '\0';
2676 ops = NULL;
2677 }
2678
2679 if (1) {
2680 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2681 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2682 struct nlattr **data = NULL;
2683 struct nlattr **slave_data = NULL;
2684 struct net *dest_net, *link_net = NULL;
2685
2686 if (ops) {
2687 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2688 err = nla_parse_nested(attr, ops->maxtype,
2689 linkinfo[IFLA_INFO_DATA],
2690 ops->policy, NULL);
2691 if (err < 0)
2692 return err;
2693 data = attr;
2694 }
2695 if (ops->validate) {
2696 err = ops->validate(tb, data, extack);
2697 if (err < 0)
2698 return err;
2699 }
2700 }
2701
2702 if (m_ops) {
2703 if (m_ops->slave_maxtype &&
2704 linkinfo[IFLA_INFO_SLAVE_DATA]) {
2705 err = nla_parse_nested(slave_attr,
2706 m_ops->slave_maxtype,
2707 linkinfo[IFLA_INFO_SLAVE_DATA],
2708 m_ops->slave_policy,
2709 NULL);
2710 if (err < 0)
2711 return err;
2712 slave_data = slave_attr;
2713 }
2714 }
2715
2716 if (dev) {
2717 int status = 0;
2718
2719 if (nlh->nlmsg_flags & NLM_F_EXCL)
2720 return -EEXIST;
2721 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2722 return -EOPNOTSUPP;
2723
2724 if (linkinfo[IFLA_INFO_DATA]) {
2725 if (!ops || ops != dev->rtnl_link_ops ||
2726 !ops->changelink)
2727 return -EOPNOTSUPP;
2728
2729 err = ops->changelink(dev, tb, data, extack);
2730 if (err < 0)
2731 return err;
2732 status |= DO_SETLINK_NOTIFY;
2733 }
2734
2735 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2736 if (!m_ops || !m_ops->slave_changelink)
2737 return -EOPNOTSUPP;
2738
2739 err = m_ops->slave_changelink(master_dev, dev,
2740 tb, slave_data,
2741 extack);
2742 if (err < 0)
2743 return err;
2744 status |= DO_SETLINK_NOTIFY;
2745 }
2746
2747 return do_setlink(skb, dev, ifm, extack, tb, ifname,
2748 status);
2749 }
2750
2751 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2752 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2753 return rtnl_group_changelink(skb, net,
2754 nla_get_u32(tb[IFLA_GROUP]),
2755 ifm, extack, tb);
2756 return -ENODEV;
2757 }
2758
2759 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
2760 return -EOPNOTSUPP;
2761
2762 if (!ops) {
2763 #ifdef CONFIG_MODULES
2764 if (kind[0]) {
2765 __rtnl_unlock();
2766 request_module("rtnl-link-%s", kind);
2767 rtnl_lock();
2768 ops = rtnl_link_ops_get(kind);
2769 if (ops)
2770 goto replay;
2771 }
2772 #endif
2773 return -EOPNOTSUPP;
2774 }
2775
2776 if (!ops->setup)
2777 return -EOPNOTSUPP;
2778
2779 if (!ifname[0]) {
2780 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2781 name_assign_type = NET_NAME_ENUM;
2782 }
2783
2784 dest_net = rtnl_link_get_net(net, tb);
2785 if (IS_ERR(dest_net))
2786 return PTR_ERR(dest_net);
2787
2788 err = -EPERM;
2789 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2790 goto out;
2791
2792 if (tb[IFLA_LINK_NETNSID]) {
2793 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2794
2795 link_net = get_net_ns_by_id(dest_net, id);
2796 if (!link_net) {
2797 err = -EINVAL;
2798 goto out;
2799 }
2800 err = -EPERM;
2801 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2802 goto out;
2803 }
2804
2805 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2806 name_assign_type, ops, tb);
2807 if (IS_ERR(dev)) {
2808 err = PTR_ERR(dev);
2809 goto out;
2810 }
2811
2812 dev->ifindex = ifm->ifi_index;
2813
2814 if (ops->newlink) {
2815 err = ops->newlink(link_net ? : net, dev, tb, data,
2816 extack);
2817 /* Drivers should call free_netdev() in ->destructor
2818 * and unregister it on failure after registration
2819 * so that device could be finally freed in rtnl_unlock.
2820 */
2821 if (err < 0) {
2822 /* If device is not registered at all, free it now */
2823 if (dev->reg_state == NETREG_UNINITIALIZED)
2824 free_netdev(dev);
2825 goto out;
2826 }
2827 } else {
2828 err = register_netdevice(dev);
2829 if (err < 0) {
2830 free_netdev(dev);
2831 goto out;
2832 }
2833 }
2834 err = rtnl_configure_link(dev, ifm);
2835 if (err < 0)
2836 goto out_unregister;
2837 if (link_net) {
2838 err = dev_change_net_namespace(dev, dest_net, ifname);
2839 if (err < 0)
2840 goto out_unregister;
2841 }
2842 if (tb[IFLA_MASTER]) {
2843 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]),
2844 extack);
2845 if (err)
2846 goto out_unregister;
2847 }
2848 out:
2849 if (link_net)
2850 put_net(link_net);
2851 put_net(dest_net);
2852 return err;
2853 out_unregister:
2854 if (ops->newlink) {
2855 LIST_HEAD(list_kill);
2856
2857 ops->dellink(dev, &list_kill);
2858 unregister_netdevice_many(&list_kill);
2859 } else {
2860 unregister_netdevice(dev);
2861 }
2862 goto out;
2863 }
2864 }
2865
2866 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2867 struct netlink_ext_ack *extack)
2868 {
2869 struct net *net = sock_net(skb->sk);
2870 struct net *tgt_net = net;
2871 struct ifinfomsg *ifm;
2872 char ifname[IFNAMSIZ];
2873 struct nlattr *tb[IFLA_MAX+1];
2874 struct net_device *dev = NULL;
2875 struct sk_buff *nskb;
2876 int netnsid = -1;
2877 int err;
2878 u32 ext_filter_mask = 0;
2879
2880 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2881 if (err < 0)
2882 return err;
2883
2884 if (tb[IFLA_IF_NETNSID]) {
2885 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
2886 tgt_net = get_target_net(NETLINK_CB(skb).sk, netnsid);
2887 if (IS_ERR(tgt_net))
2888 return PTR_ERR(tgt_net);
2889 }
2890
2891 if (tb[IFLA_IFNAME])
2892 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2893
2894 if (tb[IFLA_EXT_MASK])
2895 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2896
2897 err = -EINVAL;
2898 ifm = nlmsg_data(nlh);
2899 if (ifm->ifi_index > 0)
2900 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
2901 else if (tb[IFLA_IFNAME])
2902 dev = __dev_get_by_name(tgt_net, ifname);
2903 else
2904 goto out;
2905
2906 err = -ENODEV;
2907 if (dev == NULL)
2908 goto out;
2909
2910 err = -ENOBUFS;
2911 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2912 if (nskb == NULL)
2913 goto out;
2914
2915 err = rtnl_fill_ifinfo(nskb, dev, net,
2916 RTM_NEWLINK, NETLINK_CB(skb).portid,
2917 nlh->nlmsg_seq, 0, 0, ext_filter_mask,
2918 0, NULL, netnsid);
2919 if (err < 0) {
2920 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2921 WARN_ON(err == -EMSGSIZE);
2922 kfree_skb(nskb);
2923 } else
2924 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2925 out:
2926 if (netnsid >= 0)
2927 put_net(tgt_net);
2928
2929 return err;
2930 }
2931
2932 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2933 {
2934 struct net *net = sock_net(skb->sk);
2935 struct net_device *dev;
2936 struct nlattr *tb[IFLA_MAX+1];
2937 u32 ext_filter_mask = 0;
2938 u16 min_ifinfo_dump_size = 0;
2939 int hdrlen;
2940
2941 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2942 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2943 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2944
2945 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
2946 if (tb[IFLA_EXT_MASK])
2947 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2948 }
2949
2950 if (!ext_filter_mask)
2951 return NLMSG_GOODSIZE;
2952 /*
2953 * traverse the list of net devices and compute the minimum
2954 * buffer size based upon the filter mask.
2955 */
2956 rcu_read_lock();
2957 for_each_netdev_rcu(net, dev) {
2958 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2959 if_nlmsg_size(dev,
2960 ext_filter_mask));
2961 }
2962 rcu_read_unlock();
2963
2964 return nlmsg_total_size(min_ifinfo_dump_size);
2965 }
2966
2967 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2968 {
2969 int idx;
2970 int s_idx = cb->family;
2971
2972 if (s_idx == 0)
2973 s_idx = 1;
2974
2975 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2976 int type = cb->nlh->nlmsg_type-RTM_BASE;
2977 struct rtnl_link *handlers;
2978 rtnl_dumpit_func dumpit;
2979
2980 if (idx < s_idx || idx == PF_PACKET)
2981 continue;
2982
2983 handlers = rtnl_dereference(rtnl_msg_handlers[idx]);
2984 if (!handlers)
2985 continue;
2986
2987 dumpit = READ_ONCE(handlers[type].dumpit);
2988 if (!dumpit)
2989 continue;
2990
2991 if (idx > s_idx) {
2992 memset(&cb->args[0], 0, sizeof(cb->args));
2993 cb->prev_seq = 0;
2994 cb->seq = 0;
2995 }
2996 if (dumpit(skb, cb))
2997 break;
2998 }
2999 cb->family = idx;
3000
3001 return skb->len;
3002 }
3003
3004 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3005 unsigned int change,
3006 u32 event, gfp_t flags, int *new_nsid)
3007 {
3008 struct net *net = dev_net(dev);
3009 struct sk_buff *skb;
3010 int err = -ENOBUFS;
3011 size_t if_info_size;
3012
3013 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3014 if (skb == NULL)
3015 goto errout;
3016
3017 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3018 type, 0, 0, change, 0, 0, event,
3019 new_nsid, -1);
3020 if (err < 0) {
3021 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3022 WARN_ON(err == -EMSGSIZE);
3023 kfree_skb(skb);
3024 goto errout;
3025 }
3026 return skb;
3027 errout:
3028 if (err < 0)
3029 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3030 return NULL;
3031 }
3032
3033 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3034 {
3035 struct net *net = dev_net(dev);
3036
3037 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3038 }
3039
3040 static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3041 unsigned int change, u32 event,
3042 gfp_t flags, int *new_nsid)
3043 {
3044 struct sk_buff *skb;
3045
3046 if (dev->reg_state != NETREG_REGISTERED)
3047 return;
3048
3049 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid);
3050 if (skb)
3051 rtmsg_ifinfo_send(skb, dev, flags);
3052 }
3053
3054 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3055 gfp_t flags)
3056 {
3057 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags, NULL);
3058 }
3059
3060 void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3061 gfp_t flags, int *new_nsid)
3062 {
3063 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3064 new_nsid);
3065 }
3066
3067 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3068 struct net_device *dev,
3069 u8 *addr, u16 vid, u32 pid, u32 seq,
3070 int type, unsigned int flags,
3071 int nlflags, u16 ndm_state)
3072 {
3073 struct nlmsghdr *nlh;
3074 struct ndmsg *ndm;
3075
3076 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3077 if (!nlh)
3078 return -EMSGSIZE;
3079
3080 ndm = nlmsg_data(nlh);
3081 ndm->ndm_family = AF_BRIDGE;
3082 ndm->ndm_pad1 = 0;
3083 ndm->ndm_pad2 = 0;
3084 ndm->ndm_flags = flags;
3085 ndm->ndm_type = 0;
3086 ndm->ndm_ifindex = dev->ifindex;
3087 ndm->ndm_state = ndm_state;
3088
3089 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3090 goto nla_put_failure;
3091 if (vid)
3092 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3093 goto nla_put_failure;
3094
3095 nlmsg_end(skb, nlh);
3096 return 0;
3097
3098 nla_put_failure:
3099 nlmsg_cancel(skb, nlh);
3100 return -EMSGSIZE;
3101 }
3102
3103 static inline size_t rtnl_fdb_nlmsg_size(void)
3104 {
3105 return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3106 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */
3107 nla_total_size(sizeof(u16)) + /* NDA_VLAN */
3108 0;
3109 }
3110
3111 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3112 u16 ndm_state)
3113 {
3114 struct net *net = dev_net(dev);
3115 struct sk_buff *skb;
3116 int err = -ENOBUFS;
3117
3118 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3119 if (!skb)
3120 goto errout;
3121
3122 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3123 0, 0, type, NTF_SELF, 0, ndm_state);
3124 if (err < 0) {
3125 kfree_skb(skb);
3126 goto errout;
3127 }
3128
3129 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3130 return;
3131 errout:
3132 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3133 }
3134
3135 /**
3136 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3137 */
3138 int ndo_dflt_fdb_add(struct ndmsg *ndm,
3139 struct nlattr *tb[],
3140 struct net_device *dev,
3141 const unsigned char *addr, u16 vid,
3142 u16 flags)
3143 {
3144 int err = -EINVAL;
3145
3146 /* If aging addresses are supported device will need to
3147 * implement its own handler for this.
3148 */
3149 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3150 pr_info("%s: FDB only supports static addresses\n", dev->name);
3151 return err;
3152 }
3153
3154 if (vid) {
3155 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3156 return err;
3157 }
3158
3159 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3160 err = dev_uc_add_excl(dev, addr);
3161 else if (is_multicast_ether_addr(addr))
3162 err = dev_mc_add_excl(dev, addr);
3163
3164 /* Only return duplicate errors if NLM_F_EXCL is set */
3165 if (err == -EEXIST && !(flags & NLM_F_EXCL))
3166 err = 0;
3167
3168 return err;
3169 }
3170 EXPORT_SYMBOL(ndo_dflt_fdb_add);
3171
3172 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3173 struct netlink_ext_ack *extack)
3174 {
3175 u16 vid = 0;
3176
3177 if (vlan_attr) {
3178 if (nla_len(vlan_attr) != sizeof(u16)) {
3179 NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3180 return -EINVAL;
3181 }
3182
3183 vid = nla_get_u16(vlan_attr);
3184
3185 if (!vid || vid >= VLAN_VID_MASK) {
3186 NL_SET_ERR_MSG(extack, "invalid vlan id");
3187 return -EINVAL;
3188 }
3189 }
3190 *p_vid = vid;
3191 return 0;
3192 }
3193
3194 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3195 struct netlink_ext_ack *extack)
3196 {
3197 struct net *net = sock_net(skb->sk);
3198 struct ndmsg *ndm;
3199 struct nlattr *tb[NDA_MAX+1];
3200 struct net_device *dev;
3201 u8 *addr;
3202 u16 vid;
3203 int err;
3204
3205 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3206 if (err < 0)
3207 return err;
3208
3209 ndm = nlmsg_data(nlh);
3210 if (ndm->ndm_ifindex == 0) {
3211 NL_SET_ERR_MSG(extack, "invalid ifindex");
3212 return -EINVAL;
3213 }
3214
3215 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3216 if (dev == NULL) {
3217 NL_SET_ERR_MSG(extack, "unknown ifindex");
3218 return -ENODEV;
3219 }
3220
3221 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3222 NL_SET_ERR_MSG(extack, "invalid address");
3223 return -EINVAL;
3224 }
3225
3226 addr = nla_data(tb[NDA_LLADDR]);
3227
3228 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3229 if (err)
3230 return err;
3231
3232 err = -EOPNOTSUPP;
3233
3234 /* Support fdb on master device the net/bridge default case */
3235 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3236 (dev->priv_flags & IFF_BRIDGE_PORT)) {
3237 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3238 const struct net_device_ops *ops = br_dev->netdev_ops;
3239
3240 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3241 nlh->nlmsg_flags);
3242 if (err)
3243 goto out;
3244 else
3245 ndm->ndm_flags &= ~NTF_MASTER;
3246 }
3247
3248 /* Embedded bridge, macvlan, and any other device support */
3249 if ((ndm->ndm_flags & NTF_SELF)) {
3250 if (dev->netdev_ops->ndo_fdb_add)
3251 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3252 vid,
3253 nlh->nlmsg_flags);
3254 else
3255 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3256 nlh->nlmsg_flags);
3257
3258 if (!err) {
3259 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3260 ndm->ndm_state);
3261 ndm->ndm_flags &= ~NTF_SELF;
3262 }
3263 }
3264 out:
3265 return err;
3266 }
3267
3268 /**
3269 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3270 */
3271 int ndo_dflt_fdb_del(struct ndmsg *ndm,
3272 struct nlattr *tb[],
3273 struct net_device *dev,
3274 const unsigned char *addr, u16 vid)
3275 {
3276 int err = -EINVAL;
3277
3278 /* If aging addresses are supported device will need to
3279 * implement its own handler for this.
3280 */
3281 if (!(ndm->ndm_state & NUD_PERMANENT)) {
3282 pr_info("%s: FDB only supports static addresses\n", dev->name);
3283 return err;
3284 }
3285
3286 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3287 err = dev_uc_del(dev, addr);
3288 else if (is_multicast_ether_addr(addr))
3289 err = dev_mc_del(dev, addr);
3290
3291 return err;
3292 }
3293 EXPORT_SYMBOL(ndo_dflt_fdb_del);
3294
3295 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3296 struct netlink_ext_ack *extack)
3297 {
3298 struct net *net = sock_net(skb->sk);
3299 struct ndmsg *ndm;
3300 struct nlattr *tb[NDA_MAX+1];
3301 struct net_device *dev;
3302 int err = -EINVAL;
3303 __u8 *addr;
3304 u16 vid;
3305
3306 if (!netlink_capable(skb, CAP_NET_ADMIN))
3307 return -EPERM;
3308
3309 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3310 if (err < 0)
3311 return err;
3312
3313 ndm = nlmsg_data(nlh);
3314 if (ndm->ndm_ifindex == 0) {
3315 NL_SET_ERR_MSG(extack, "invalid ifindex");
3316 return -EINVAL;
3317 }
3318
3319 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3320 if (dev == NULL) {
3321 NL_SET_ERR_MSG(extack, "unknown ifindex");
3322 return -ENODEV;
3323 }
3324
3325 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3326 NL_SET_ERR_MSG(extack, "invalid address");
3327 return -EINVAL;
3328 }
3329
3330 addr = nla_data(tb[NDA_LLADDR]);
3331
3332 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3333 if (err)
3334 return err;
3335
3336 err = -EOPNOTSUPP;
3337
3338 /* Support fdb on master device the net/bridge default case */
3339 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3340 (dev->priv_flags & IFF_BRIDGE_PORT)) {
3341 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3342 const struct net_device_ops *ops = br_dev->netdev_ops;
3343
3344 if (ops->ndo_fdb_del)
3345 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3346
3347 if (err)
3348 goto out;
3349 else
3350 ndm->ndm_flags &= ~NTF_MASTER;
3351 }
3352
3353 /* Embedded bridge, macvlan, and any other device support */
3354 if (ndm->ndm_flags & NTF_SELF) {
3355 if (dev->netdev_ops->ndo_fdb_del)
3356 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3357 vid);
3358 else
3359 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3360
3361 if (!err) {
3362 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3363 ndm->ndm_state);
3364 ndm->ndm_flags &= ~NTF_SELF;
3365 }
3366 }
3367 out:
3368 return err;
3369 }
3370
3371 static int nlmsg_populate_fdb(struct sk_buff *skb,
3372 struct netlink_callback *cb,
3373 struct net_device *dev,
3374 int *idx,
3375 struct netdev_hw_addr_list *list)
3376 {
3377 struct netdev_hw_addr *ha;
3378 int err;
3379 u32 portid, seq;
3380
3381 portid = NETLINK_CB(cb->skb).portid;
3382 seq = cb->nlh->nlmsg_seq;
3383
3384 list_for_each_entry(ha, &list->list, list) {
3385 if (*idx < cb->args[2])
3386 goto skip;
3387
3388 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3389 portid, seq,
3390 RTM_NEWNEIGH, NTF_SELF,
3391 NLM_F_MULTI, NUD_PERMANENT);
3392 if (err < 0)
3393 return err;
3394 skip:
3395 *idx += 1;
3396 }
3397 return 0;
3398 }
3399
3400 /**
3401 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3402 * @nlh: netlink message header
3403 * @dev: netdevice
3404 *
3405 * Default netdevice operation to dump the existing unicast address list.
3406 * Returns number of addresses from list put in skb.
3407 */
3408 int ndo_dflt_fdb_dump(struct sk_buff *skb,
3409 struct netlink_callback *cb,
3410 struct net_device *dev,
3411 struct net_device *filter_dev,
3412 int *idx)
3413 {
3414 int err;
3415
3416 netif_addr_lock_bh(dev);
3417 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3418 if (err)
3419 goto out;
3420 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3421 out:
3422 netif_addr_unlock_bh(dev);
3423 return err;
3424 }
3425 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3426
3427 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3428 {
3429 struct net_device *dev;
3430 struct nlattr *tb[IFLA_MAX+1];
3431 struct net_device *br_dev = NULL;
3432 const struct net_device_ops *ops = NULL;
3433 const struct net_device_ops *cops = NULL;
3434 struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3435 struct net *net = sock_net(skb->sk);
3436 struct hlist_head *head;
3437 int brport_idx = 0;
3438 int br_idx = 0;
3439 int h, s_h;
3440 int idx = 0, s_idx;
3441 int err = 0;
3442 int fidx = 0;
3443
3444 err = nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb,
3445 IFLA_MAX, ifla_policy, NULL);
3446 if (err < 0) {
3447 return -EINVAL;
3448 } else if (err == 0) {
3449 if (tb[IFLA_MASTER])
3450 br_idx = nla_get_u32(tb[IFLA_MASTER]);
3451 }
3452
3453 brport_idx = ifm->ifi_index;
3454
3455 if (br_idx) {
3456 br_dev = __dev_get_by_index(net, br_idx);
3457 if (!br_dev)
3458 return -ENODEV;
3459
3460 ops = br_dev->netdev_ops;
3461 }
3462
3463 s_h = cb->args[0];
3464 s_idx = cb->args[1];
3465
3466 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3467 idx = 0;
3468 head = &net->dev_index_head[h];
3469 hlist_for_each_entry(dev, head, index_hlist) {
3470
3471 if (brport_idx && (dev->ifindex != brport_idx))
3472 continue;
3473
3474 if (!br_idx) { /* user did not specify a specific bridge */
3475 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3476 br_dev = netdev_master_upper_dev_get(dev);
3477 cops = br_dev->netdev_ops;
3478 }
3479 } else {
3480 if (dev != br_dev &&
3481 !(dev->priv_flags & IFF_BRIDGE_PORT))
3482 continue;
3483
3484 if (br_dev != netdev_master_upper_dev_get(dev) &&
3485 !(dev->priv_flags & IFF_EBRIDGE))
3486 continue;
3487 cops = ops;
3488 }
3489
3490 if (idx < s_idx)
3491 goto cont;
3492
3493 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3494 if (cops && cops->ndo_fdb_dump) {
3495 err = cops->ndo_fdb_dump(skb, cb,
3496 br_dev, dev,
3497 &fidx);
3498 if (err == -EMSGSIZE)
3499 goto out;
3500 }
3501 }
3502
3503 if (dev->netdev_ops->ndo_fdb_dump)
3504 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
3505 dev, NULL,
3506 &fidx);
3507 else
3508 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
3509 &fidx);
3510 if (err == -EMSGSIZE)
3511 goto out;
3512
3513 cops = NULL;
3514
3515 /* reset fdb offset to 0 for rest of the interfaces */
3516 cb->args[2] = 0;
3517 fidx = 0;
3518 cont:
3519 idx++;
3520 }
3521 }
3522
3523 out:
3524 cb->args[0] = h;
3525 cb->args[1] = idx;
3526 cb->args[2] = fidx;
3527
3528 return skb->len;
3529 }
3530
3531 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3532 unsigned int attrnum, unsigned int flag)
3533 {
3534 if (mask & flag)
3535 return nla_put_u8(skb, attrnum, !!(flags & flag));
3536 return 0;
3537 }
3538
3539 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3540 struct net_device *dev, u16 mode,
3541 u32 flags, u32 mask, int nlflags,
3542 u32 filter_mask,
3543 int (*vlan_fill)(struct sk_buff *skb,
3544 struct net_device *dev,
3545 u32 filter_mask))
3546 {
3547 struct nlmsghdr *nlh;
3548 struct ifinfomsg *ifm;
3549 struct nlattr *br_afspec;
3550 struct nlattr *protinfo;
3551 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3552 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3553 int err = 0;
3554
3555 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3556 if (nlh == NULL)
3557 return -EMSGSIZE;
3558
3559 ifm = nlmsg_data(nlh);
3560 ifm->ifi_family = AF_BRIDGE;
3561 ifm->__ifi_pad = 0;
3562 ifm->ifi_type = dev->type;
3563 ifm->ifi_index = dev->ifindex;
3564 ifm->ifi_flags = dev_get_flags(dev);
3565 ifm->ifi_change = 0;
3566
3567
3568 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3569 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3570 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3571 (br_dev &&
3572 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3573 (dev->addr_len &&
3574 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3575 (dev->ifindex != dev_get_iflink(dev) &&
3576 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3577 goto nla_put_failure;
3578
3579 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3580 if (!br_afspec)
3581 goto nla_put_failure;
3582
3583 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3584 nla_nest_cancel(skb, br_afspec);
3585 goto nla_put_failure;
3586 }
3587
3588 if (mode != BRIDGE_MODE_UNDEF) {
3589 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3590 nla_nest_cancel(skb, br_afspec);
3591 goto nla_put_failure;
3592 }
3593 }
3594 if (vlan_fill) {
3595 err = vlan_fill(skb, dev, filter_mask);
3596 if (err) {
3597 nla_nest_cancel(skb, br_afspec);
3598 goto nla_put_failure;
3599 }
3600 }
3601 nla_nest_end(skb, br_afspec);
3602
3603 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3604 if (!protinfo)
3605 goto nla_put_failure;
3606
3607 if (brport_nla_put_flag(skb, flags, mask,
3608 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3609 brport_nla_put_flag(skb, flags, mask,
3610 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3611 brport_nla_put_flag(skb, flags, mask,
3612 IFLA_BRPORT_FAST_LEAVE,
3613 BR_MULTICAST_FAST_LEAVE) ||
3614 brport_nla_put_flag(skb, flags, mask,
3615 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3616 brport_nla_put_flag(skb, flags, mask,
3617 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3618 brport_nla_put_flag(skb, flags, mask,
3619 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3620 brport_nla_put_flag(skb, flags, mask,
3621 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3622 brport_nla_put_flag(skb, flags, mask,
3623 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3624 nla_nest_cancel(skb, protinfo);
3625 goto nla_put_failure;
3626 }
3627
3628 nla_nest_end(skb, protinfo);
3629
3630 nlmsg_end(skb, nlh);
3631 return 0;
3632 nla_put_failure:
3633 nlmsg_cancel(skb, nlh);
3634 return err ? err : -EMSGSIZE;
3635 }
3636 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3637
3638 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3639 {
3640 struct net *net = sock_net(skb->sk);
3641 struct net_device *dev;
3642 int idx = 0;
3643 u32 portid = NETLINK_CB(cb->skb).portid;
3644 u32 seq = cb->nlh->nlmsg_seq;
3645 u32 filter_mask = 0;
3646 int err;
3647
3648 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3649 struct nlattr *extfilt;
3650
3651 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3652 IFLA_EXT_MASK);
3653 if (extfilt) {
3654 if (nla_len(extfilt) < sizeof(filter_mask))
3655 return -EINVAL;
3656
3657 filter_mask = nla_get_u32(extfilt);
3658 }
3659 }
3660
3661 rcu_read_lock();
3662 for_each_netdev_rcu(net, dev) {
3663 const struct net_device_ops *ops = dev->netdev_ops;
3664 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3665
3666 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3667 if (idx >= cb->args[0]) {
3668 err = br_dev->netdev_ops->ndo_bridge_getlink(
3669 skb, portid, seq, dev,
3670 filter_mask, NLM_F_MULTI);
3671 if (err < 0 && err != -EOPNOTSUPP) {
3672 if (likely(skb->len))
3673 break;
3674
3675 goto out_err;
3676 }
3677 }
3678 idx++;
3679 }
3680
3681 if (ops->ndo_bridge_getlink) {
3682 if (idx >= cb->args[0]) {
3683 err = ops->ndo_bridge_getlink(skb, portid,
3684 seq, dev,
3685 filter_mask,
3686 NLM_F_MULTI);
3687 if (err < 0 && err != -EOPNOTSUPP) {
3688 if (likely(skb->len))
3689 break;
3690
3691 goto out_err;
3692 }
3693 }
3694 idx++;
3695 }
3696 }
3697 err = skb->len;
3698 out_err:
3699 rcu_read_unlock();
3700 cb->args[0] = idx;
3701
3702 return err;
3703 }
3704
3705 static inline size_t bridge_nlmsg_size(void)
3706 {
3707 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3708 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3709 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3710 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
3711 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
3712 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
3713 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
3714 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
3715 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3716 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
3717 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
3718 }
3719
3720 static int rtnl_bridge_notify(struct net_device *dev)
3721 {
3722 struct net *net = dev_net(dev);
3723 struct sk_buff *skb;
3724 int err = -EOPNOTSUPP;
3725
3726 if (!dev->netdev_ops->ndo_bridge_getlink)
3727 return 0;
3728
3729 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3730 if (!skb) {
3731 err = -ENOMEM;
3732 goto errout;
3733 }
3734
3735 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3736 if (err < 0)
3737 goto errout;
3738
3739 if (!skb->len)
3740 goto errout;
3741
3742 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3743 return 0;
3744 errout:
3745 WARN_ON(err == -EMSGSIZE);
3746 kfree_skb(skb);
3747 if (err)
3748 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3749 return err;
3750 }
3751
3752 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3753 struct netlink_ext_ack *extack)
3754 {
3755 struct net *net = sock_net(skb->sk);
3756 struct ifinfomsg *ifm;
3757 struct net_device *dev;
3758 struct nlattr *br_spec, *attr = NULL;
3759 int rem, err = -EOPNOTSUPP;
3760 u16 flags = 0;
3761 bool have_flags = false;
3762
3763 if (nlmsg_len(nlh) < sizeof(*ifm))
3764 return -EINVAL;
3765
3766 ifm = nlmsg_data(nlh);
3767 if (ifm->ifi_family != AF_BRIDGE)
3768 return -EPFNOSUPPORT;
3769
3770 dev = __dev_get_by_index(net, ifm->ifi_index);
3771 if (!dev) {
3772 NL_SET_ERR_MSG(extack, "unknown ifindex");
3773 return -ENODEV;
3774 }
3775
3776 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3777 if (br_spec) {
3778 nla_for_each_nested(attr, br_spec, rem) {
3779 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3780 if (nla_len(attr) < sizeof(flags))
3781 return -EINVAL;
3782
3783 have_flags = true;
3784 flags = nla_get_u16(attr);
3785 break;
3786 }
3787 }
3788 }
3789
3790 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3791 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3792
3793 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3794 err = -EOPNOTSUPP;
3795 goto out;
3796 }
3797
3798 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3799 if (err)
3800 goto out;
3801
3802 flags &= ~BRIDGE_FLAGS_MASTER;
3803 }
3804
3805 if ((flags & BRIDGE_FLAGS_SELF)) {
3806 if (!dev->netdev_ops->ndo_bridge_setlink)
3807 err = -EOPNOTSUPP;
3808 else
3809 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3810 flags);
3811 if (!err) {
3812 flags &= ~BRIDGE_FLAGS_SELF;
3813
3814 /* Generate event to notify upper layer of bridge
3815 * change
3816 */
3817 err = rtnl_bridge_notify(dev);
3818 }
3819 }
3820
3821 if (have_flags)
3822 memcpy(nla_data(attr), &flags, sizeof(flags));
3823 out:
3824 return err;
3825 }
3826
3827 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
3828 struct netlink_ext_ack *extack)
3829 {
3830 struct net *net = sock_net(skb->sk);
3831 struct ifinfomsg *ifm;
3832 struct net_device *dev;
3833 struct nlattr *br_spec, *attr = NULL;
3834 int rem, err = -EOPNOTSUPP;
3835 u16 flags = 0;
3836 bool have_flags = false;
3837
3838 if (nlmsg_len(nlh) < sizeof(*ifm))
3839 return -EINVAL;
3840
3841 ifm = nlmsg_data(nlh);
3842 if (ifm->ifi_family != AF_BRIDGE)
3843 return -EPFNOSUPPORT;
3844
3845 dev = __dev_get_by_index(net, ifm->ifi_index);
3846 if (!dev) {
3847 NL_SET_ERR_MSG(extack, "unknown ifindex");
3848 return -ENODEV;
3849 }
3850
3851 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3852 if (br_spec) {
3853 nla_for_each_nested(attr, br_spec, rem) {
3854 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3855 if (nla_len(attr) < sizeof(flags))
3856 return -EINVAL;
3857
3858 have_flags = true;
3859 flags = nla_get_u16(attr);
3860 break;
3861 }
3862 }
3863 }
3864
3865 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3866 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3867
3868 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3869 err = -EOPNOTSUPP;
3870 goto out;
3871 }
3872
3873 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3874 if (err)
3875 goto out;
3876
3877 flags &= ~BRIDGE_FLAGS_MASTER;
3878 }
3879
3880 if ((flags & BRIDGE_FLAGS_SELF)) {
3881 if (!dev->netdev_ops->ndo_bridge_dellink)
3882 err = -EOPNOTSUPP;
3883 else
3884 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3885 flags);
3886
3887 if (!err) {
3888 flags &= ~BRIDGE_FLAGS_SELF;
3889
3890 /* Generate event to notify upper layer of bridge
3891 * change
3892 */
3893 err = rtnl_bridge_notify(dev);
3894 }
3895 }
3896
3897 if (have_flags)
3898 memcpy(nla_data(attr), &flags, sizeof(flags));
3899 out:
3900 return err;
3901 }
3902
3903 static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
3904 {
3905 return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
3906 (!idxattr || idxattr == attrid);
3907 }
3908
3909 #define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
3910 static int rtnl_get_offload_stats_attr_size(int attr_id)
3911 {
3912 switch (attr_id) {
3913 case IFLA_OFFLOAD_XSTATS_CPU_HIT:
3914 return sizeof(struct rtnl_link_stats64);
3915 }
3916
3917 return 0;
3918 }
3919
3920 static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
3921 int *prividx)
3922 {
3923 struct nlattr *attr = NULL;
3924 int attr_id, size;
3925 void *attr_data;
3926 int err;
3927
3928 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3929 dev->netdev_ops->ndo_get_offload_stats))
3930 return -ENODATA;
3931
3932 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3933 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3934 if (attr_id < *prividx)
3935 continue;
3936
3937 size = rtnl_get_offload_stats_attr_size(attr_id);
3938 if (!size)
3939 continue;
3940
3941 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
3942 continue;
3943
3944 attr = nla_reserve_64bit(skb, attr_id, size,
3945 IFLA_OFFLOAD_XSTATS_UNSPEC);
3946 if (!attr)
3947 goto nla_put_failure;
3948
3949 attr_data = nla_data(attr);
3950 memset(attr_data, 0, size);
3951 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
3952 attr_data);
3953 if (err)
3954 goto get_offload_stats_failure;
3955 }
3956
3957 if (!attr)
3958 return -ENODATA;
3959
3960 *prividx = 0;
3961 return 0;
3962
3963 nla_put_failure:
3964 err = -EMSGSIZE;
3965 get_offload_stats_failure:
3966 *prividx = attr_id;
3967 return err;
3968 }
3969
3970 static int rtnl_get_offload_stats_size(const struct net_device *dev)
3971 {
3972 int nla_size = 0;
3973 int attr_id;
3974 int size;
3975
3976 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
3977 dev->netdev_ops->ndo_get_offload_stats))
3978 return 0;
3979
3980 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
3981 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
3982 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
3983 continue;
3984 size = rtnl_get_offload_stats_attr_size(attr_id);
3985 nla_size += nla_total_size_64bit(size);
3986 }
3987
3988 if (nla_size != 0)
3989 nla_size += nla_total_size(0);
3990
3991 return nla_size;
3992 }
3993
3994 static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
3995 int type, u32 pid, u32 seq, u32 change,
3996 unsigned int flags, unsigned int filter_mask,
3997 int *idxattr, int *prividx)
3998 {
3999 struct if_stats_msg *ifsm;
4000 struct nlmsghdr *nlh;
4001 struct nlattr *attr;
4002 int s_prividx = *prividx;
4003 int err;
4004
4005 ASSERT_RTNL();
4006
4007 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
4008 if (!nlh)
4009 return -EMSGSIZE;
4010
4011 ifsm = nlmsg_data(nlh);
4012 ifsm->family = PF_UNSPEC;
4013 ifsm->pad1 = 0;
4014 ifsm->pad2 = 0;
4015 ifsm->ifindex = dev->ifindex;
4016 ifsm->filter_mask = filter_mask;
4017
4018 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
4019 struct rtnl_link_stats64 *sp;
4020
4021 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
4022 sizeof(struct rtnl_link_stats64),
4023 IFLA_STATS_UNSPEC);
4024 if (!attr)
4025 goto nla_put_failure;
4026
4027 sp = nla_data(attr);
4028 dev_get_stats(dev, sp);
4029 }
4030
4031 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
4032 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4033
4034 if (ops && ops->fill_linkxstats) {
4035 *idxattr = IFLA_STATS_LINK_XSTATS;
4036 attr = nla_nest_start(skb,
4037 IFLA_STATS_LINK_XSTATS);
4038 if (!attr)
4039 goto nla_put_failure;
4040
4041 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4042 nla_nest_end(skb, attr);
4043 if (err)
4044 goto nla_put_failure;
4045 *idxattr = 0;
4046 }
4047 }
4048
4049 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
4050 *idxattr)) {
4051 const struct rtnl_link_ops *ops = NULL;
4052 const struct net_device *master;
4053
4054 master = netdev_master_upper_dev_get(dev);
4055 if (master)
4056 ops = master->rtnl_link_ops;
4057 if (ops && ops->fill_linkxstats) {
4058 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
4059 attr = nla_nest_start(skb,
4060 IFLA_STATS_LINK_XSTATS_SLAVE);
4061 if (!attr)
4062 goto nla_put_failure;
4063
4064 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4065 nla_nest_end(skb, attr);
4066 if (err)
4067 goto nla_put_failure;
4068 *idxattr = 0;
4069 }
4070 }
4071
4072 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
4073 *idxattr)) {
4074 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
4075 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
4076 if (!attr)
4077 goto nla_put_failure;
4078
4079 err = rtnl_get_offload_stats(skb, dev, prividx);
4080 if (err == -ENODATA)
4081 nla_nest_cancel(skb, attr);
4082 else
4083 nla_nest_end(skb, attr);
4084
4085 if (err && err != -ENODATA)
4086 goto nla_put_failure;
4087 *idxattr = 0;
4088 }
4089
4090 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
4091 struct rtnl_af_ops *af_ops;
4092
4093 *idxattr = IFLA_STATS_AF_SPEC;
4094 attr = nla_nest_start(skb, IFLA_STATS_AF_SPEC);
4095 if (!attr)
4096 goto nla_put_failure;
4097
4098 rcu_read_lock();
4099 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4100 if (af_ops->fill_stats_af) {
4101 struct nlattr *af;
4102 int err;
4103
4104 af = nla_nest_start(skb, af_ops->family);
4105 if (!af) {
4106 rcu_read_unlock();
4107 goto nla_put_failure;
4108 }
4109 err = af_ops->fill_stats_af(skb, dev);
4110
4111 if (err == -ENODATA) {
4112 nla_nest_cancel(skb, af);
4113 } else if (err < 0) {
4114 rcu_read_unlock();
4115 goto nla_put_failure;
4116 }
4117
4118 nla_nest_end(skb, af);
4119 }
4120 }
4121 rcu_read_unlock();
4122
4123 nla_nest_end(skb, attr);
4124
4125 *idxattr = 0;
4126 }
4127
4128 nlmsg_end(skb, nlh);
4129
4130 return 0;
4131
4132 nla_put_failure:
4133 /* not a multi message or no progress mean a real error */
4134 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
4135 nlmsg_cancel(skb, nlh);
4136 else
4137 nlmsg_end(skb, nlh);
4138
4139 return -EMSGSIZE;
4140 }
4141
4142 static size_t if_nlmsg_stats_size(const struct net_device *dev,
4143 u32 filter_mask)
4144 {
4145 size_t size = 0;
4146
4147 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
4148 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
4149
4150 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
4151 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4152 int attr = IFLA_STATS_LINK_XSTATS;
4153
4154 if (ops && ops->get_linkxstats_size) {
4155 size += nla_total_size(ops->get_linkxstats_size(dev,
4156 attr));
4157 /* for IFLA_STATS_LINK_XSTATS */
4158 size += nla_total_size(0);
4159 }
4160 }
4161
4162 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
4163 struct net_device *_dev = (struct net_device *)dev;
4164 const struct rtnl_link_ops *ops = NULL;
4165 const struct net_device *master;
4166
4167 /* netdev_master_upper_dev_get can't take const */
4168 master = netdev_master_upper_dev_get(_dev);
4169 if (master)
4170 ops = master->rtnl_link_ops;
4171 if (ops && ops->get_linkxstats_size) {
4172 int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
4173
4174 size += nla_total_size(ops->get_linkxstats_size(dev,
4175 attr));
4176 /* for IFLA_STATS_LINK_XSTATS_SLAVE */
4177 size += nla_total_size(0);
4178 }
4179 }
4180
4181 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
4182 size += rtnl_get_offload_stats_size(dev);
4183
4184 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
4185 struct rtnl_af_ops *af_ops;
4186
4187 /* for IFLA_STATS_AF_SPEC */
4188 size += nla_total_size(0);
4189
4190 rcu_read_lock();
4191 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4192 if (af_ops->get_stats_af_size) {
4193 size += nla_total_size(
4194 af_ops->get_stats_af_size(dev));
4195
4196 /* for AF_* */
4197 size += nla_total_size(0);
4198 }
4199 }
4200 rcu_read_unlock();
4201 }
4202
4203 return size;
4204 }
4205
4206 static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
4207 struct netlink_ext_ack *extack)
4208 {
4209 struct net *net = sock_net(skb->sk);
4210 struct net_device *dev = NULL;
4211 int idxattr = 0, prividx = 0;
4212 struct if_stats_msg *ifsm;
4213 struct sk_buff *nskb;
4214 u32 filter_mask;
4215 int err;
4216
4217 if (nlmsg_len(nlh) < sizeof(*ifsm))
4218 return -EINVAL;
4219
4220 ifsm = nlmsg_data(nlh);
4221 if (ifsm->ifindex > 0)
4222 dev = __dev_get_by_index(net, ifsm->ifindex);
4223 else
4224 return -EINVAL;
4225
4226 if (!dev)
4227 return -ENODEV;
4228
4229 filter_mask = ifsm->filter_mask;
4230 if (!filter_mask)
4231 return -EINVAL;
4232
4233 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
4234 if (!nskb)
4235 return -ENOBUFS;
4236
4237 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
4238 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
4239 0, filter_mask, &idxattr, &prividx);
4240 if (err < 0) {
4241 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
4242 WARN_ON(err == -EMSGSIZE);
4243 kfree_skb(nskb);
4244 } else {
4245 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
4246 }
4247
4248 return err;
4249 }
4250
4251 static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
4252 {
4253 int h, s_h, err, s_idx, s_idxattr, s_prividx;
4254 struct net *net = sock_net(skb->sk);
4255 unsigned int flags = NLM_F_MULTI;
4256 struct if_stats_msg *ifsm;
4257 struct hlist_head *head;
4258 struct net_device *dev;
4259 u32 filter_mask = 0;
4260 int idx = 0;
4261
4262 s_h = cb->args[0];
4263 s_idx = cb->args[1];
4264 s_idxattr = cb->args[2];
4265 s_prividx = cb->args[3];
4266
4267 cb->seq = net->dev_base_seq;
4268
4269 if (nlmsg_len(cb->nlh) < sizeof(*ifsm))
4270 return -EINVAL;
4271
4272 ifsm = nlmsg_data(cb->nlh);
4273 filter_mask = ifsm->filter_mask;
4274 if (!filter_mask)
4275 return -EINVAL;
4276
4277 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4278 idx = 0;
4279 head = &net->dev_index_head[h];
4280 hlist_for_each_entry(dev, head, index_hlist) {
4281 if (idx < s_idx)
4282 goto cont;
4283 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
4284 NETLINK_CB(cb->skb).portid,
4285 cb->nlh->nlmsg_seq, 0,
4286 flags, filter_mask,
4287 &s_idxattr, &s_prividx);
4288 /* If we ran out of room on the first message,
4289 * we're in trouble
4290 */
4291 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
4292
4293 if (err < 0)
4294 goto out;
4295 s_prividx = 0;
4296 s_idxattr = 0;
4297 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4298 cont:
4299 idx++;
4300 }
4301 }
4302 out:
4303 cb->args[3] = s_prividx;
4304 cb->args[2] = s_idxattr;
4305 cb->args[1] = idx;
4306 cb->args[0] = h;
4307
4308 return skb->len;
4309 }
4310
4311 /* Process one rtnetlink message. */
4312
4313 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
4314 struct netlink_ext_ack *extack)
4315 {
4316 struct net *net = sock_net(skb->sk);
4317 struct rtnl_link *handlers;
4318 int err = -EOPNOTSUPP;
4319 rtnl_doit_func doit;
4320 unsigned int flags;
4321 int kind;
4322 int family;
4323 int type;
4324
4325 type = nlh->nlmsg_type;
4326 if (type > RTM_MAX)
4327 return -EOPNOTSUPP;
4328
4329 type -= RTM_BASE;
4330
4331 /* All the messages must have at least 1 byte length */
4332 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
4333 return 0;
4334
4335 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
4336 kind = type&3;
4337
4338 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
4339 return -EPERM;
4340
4341 if (family >= ARRAY_SIZE(rtnl_msg_handlers))
4342 family = PF_UNSPEC;
4343
4344 rcu_read_lock();
4345 handlers = rcu_dereference(rtnl_msg_handlers[family]);
4346 if (!handlers) {
4347 family = PF_UNSPEC;
4348 handlers = rcu_dereference(rtnl_msg_handlers[family]);
4349 }
4350
4351 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
4352 struct sock *rtnl;
4353 rtnl_dumpit_func dumpit;
4354 u16 min_dump_alloc = 0;
4355
4356 dumpit = READ_ONCE(handlers[type].dumpit);
4357 if (!dumpit) {
4358 family = PF_UNSPEC;
4359 handlers = rcu_dereference(rtnl_msg_handlers[PF_UNSPEC]);
4360 if (!handlers)
4361 goto err_unlock;
4362
4363 dumpit = READ_ONCE(handlers[type].dumpit);
4364 if (!dumpit)
4365 goto err_unlock;
4366 }
4367
4368 refcount_inc(&rtnl_msg_handlers_ref[family]);
4369
4370 if (type == RTM_GETLINK - RTM_BASE)
4371 min_dump_alloc = rtnl_calcit(skb, nlh);
4372
4373 rcu_read_unlock();
4374
4375 rtnl = net->rtnl;
4376 {
4377 struct netlink_dump_control c = {
4378 .dump = dumpit,
4379 .min_dump_alloc = min_dump_alloc,
4380 };
4381 err = netlink_dump_start(rtnl, skb, nlh, &c);
4382 }
4383 refcount_dec(&rtnl_msg_handlers_ref[family]);
4384 return err;
4385 }
4386
4387 doit = READ_ONCE(handlers[type].doit);
4388 if (!doit) {
4389 family = PF_UNSPEC;
4390 handlers = rcu_dereference(rtnl_msg_handlers[family]);
4391 }
4392
4393 flags = READ_ONCE(handlers[type].flags);
4394 if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
4395 refcount_inc(&rtnl_msg_handlers_ref[family]);
4396 doit = READ_ONCE(handlers[type].doit);
4397 rcu_read_unlock();
4398 if (doit)
4399 err = doit(skb, nlh, extack);
4400 refcount_dec(&rtnl_msg_handlers_ref[family]);
4401 return err;
4402 }
4403
4404 rcu_read_unlock();
4405
4406 rtnl_lock();
4407 handlers = rtnl_dereference(rtnl_msg_handlers[family]);
4408 if (handlers) {
4409 doit = READ_ONCE(handlers[type].doit);
4410 if (doit)
4411 err = doit(skb, nlh, extack);
4412 }
4413 rtnl_unlock();
4414 return err;
4415
4416 err_unlock:
4417 rcu_read_unlock();
4418 return -EOPNOTSUPP;
4419 }
4420
4421 static void rtnetlink_rcv(struct sk_buff *skb)
4422 {
4423 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
4424 }
4425
4426 static int rtnetlink_bind(struct net *net, int group)
4427 {
4428 switch (group) {
4429 case RTNLGRP_IPV4_MROUTE_R:
4430 case RTNLGRP_IPV6_MROUTE_R:
4431 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4432 return -EPERM;
4433 break;
4434 }
4435 return 0;
4436 }
4437
4438 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
4439 {
4440 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4441
4442 switch (event) {
4443 case NETDEV_REBOOT:
4444 case NETDEV_CHANGEMTU:
4445 case NETDEV_CHANGEADDR:
4446 case NETDEV_CHANGENAME:
4447 case NETDEV_FEAT_CHANGE:
4448 case NETDEV_BONDING_FAILOVER:
4449 case NETDEV_POST_TYPE_CHANGE:
4450 case NETDEV_NOTIFY_PEERS:
4451 case NETDEV_CHANGEUPPER:
4452 case NETDEV_RESEND_IGMP:
4453 case NETDEV_CHANGEINFODATA:
4454 case NETDEV_CHANGELOWERSTATE:
4455 case NETDEV_CHANGE_TX_QUEUE_LEN:
4456 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
4457 GFP_KERNEL, NULL);
4458 break;
4459 default:
4460 break;
4461 }
4462 return NOTIFY_DONE;
4463 }
4464
4465 static struct notifier_block rtnetlink_dev_notifier = {
4466 .notifier_call = rtnetlink_event,
4467 };
4468
4469
4470 static int __net_init rtnetlink_net_init(struct net *net)
4471 {
4472 struct sock *sk;
4473 struct netlink_kernel_cfg cfg = {
4474 .groups = RTNLGRP_MAX,
4475 .input = rtnetlink_rcv,
4476 .cb_mutex = &rtnl_mutex,
4477 .flags = NL_CFG_F_NONROOT_RECV,
4478 .bind = rtnetlink_bind,
4479 };
4480
4481 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
4482 if (!sk)
4483 return -ENOMEM;
4484 net->rtnl = sk;
4485 return 0;
4486 }
4487
4488 static void __net_exit rtnetlink_net_exit(struct net *net)
4489 {
4490 netlink_kernel_release(net->rtnl);
4491 net->rtnl = NULL;
4492 }
4493
4494 static struct pernet_operations rtnetlink_net_ops = {
4495 .init = rtnetlink_net_init,
4496 .exit = rtnetlink_net_exit,
4497 };
4498
4499 void __init rtnetlink_init(void)
4500 {
4501 int i;
4502
4503 for (i = 0; i < ARRAY_SIZE(rtnl_msg_handlers_ref); i++)
4504 refcount_set(&rtnl_msg_handlers_ref[i], 1);
4505
4506 if (register_pernet_subsys(&rtnetlink_net_ops))
4507 panic("rtnetlink_init: cannot initialize rtnetlink\n");
4508
4509 register_netdevice_notifier(&rtnetlink_dev_notifier);
4510
4511 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
4512 rtnl_dump_ifinfo, 0);
4513 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
4514 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
4515 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
4516
4517 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
4518 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
4519 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
4520
4521 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
4522 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
4523 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, 0);
4524
4525 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
4526 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
4527 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
4528
4529 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
4530 0);
4531 }
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