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