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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Routing netlink socket interface: protocol independent part.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 * Fixes:
12 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
13 */
14
15#include <linux/bitops.h>
16#include <linux/errno.h>
17#include <linux/module.h>
18#include <linux/types.h>
19#include <linux/socket.h>
20#include <linux/kernel.h>
21#include <linux/timer.h>
22#include <linux/string.h>
23#include <linux/sockios.h>
24#include <linux/net.h>
25#include <linux/fcntl.h>
26#include <linux/mm.h>
27#include <linux/slab.h>
28#include <linux/interrupt.h>
29#include <linux/capability.h>
30#include <linux/skbuff.h>
31#include <linux/init.h>
32#include <linux/security.h>
33#include <linux/mutex.h>
34#include <linux/if_addr.h>
35#include <linux/if_bridge.h>
36#include <linux/if_vlan.h>
37#include <linux/pci.h>
38#include <linux/etherdevice.h>
39#include <linux/bpf.h>
40
41#include <linux/uaccess.h>
42
43#include <linux/inet.h>
44#include <linux/netdevice.h>
45#include <net/ip.h>
46#include <net/protocol.h>
47#include <net/arp.h>
48#include <net/route.h>
49#include <net/udp.h>
50#include <net/tcp.h>
51#include <net/sock.h>
52#include <net/pkt_sched.h>
53#include <net/fib_rules.h>
54#include <net/rtnetlink.h>
55#include <net/net_namespace.h>
56
57#define RTNL_MAX_TYPE 50
58#define RTNL_SLAVE_MAX_TYPE 36
59
60struct rtnl_link {
61 rtnl_doit_func doit;
62 rtnl_dumpit_func dumpit;
63 struct module *owner;
64 unsigned int flags;
65 struct rcu_head rcu;
66};
67
68static DEFINE_MUTEX(rtnl_mutex);
69
70void rtnl_lock(void)
71{
72 mutex_lock(&rtnl_mutex);
73}
74EXPORT_SYMBOL(rtnl_lock);
75
76int rtnl_lock_killable(void)
77{
78 return mutex_lock_killable(&rtnl_mutex);
79}
80EXPORT_SYMBOL(rtnl_lock_killable);
81
82static struct sk_buff *defer_kfree_skb_list;
83void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
84{
85 if (head && tail) {
86 tail->next = defer_kfree_skb_list;
87 defer_kfree_skb_list = head;
88 }
89}
90EXPORT_SYMBOL(rtnl_kfree_skbs);
91
92void __rtnl_unlock(void)
93{
94 struct sk_buff *head = defer_kfree_skb_list;
95
96 defer_kfree_skb_list = NULL;
97
98 mutex_unlock(&rtnl_mutex);
99
100 while (head) {
101 struct sk_buff *next = head->next;
102
103 kfree_skb(head);
104 cond_resched();
105 head = next;
106 }
107}
108
109void rtnl_unlock(void)
110{
111 /* This fellow will unlock it for us. */
112 netdev_run_todo();
113}
114EXPORT_SYMBOL(rtnl_unlock);
115
116int rtnl_trylock(void)
117{
118 return mutex_trylock(&rtnl_mutex);
119}
120EXPORT_SYMBOL(rtnl_trylock);
121
122int rtnl_is_locked(void)
123{
124 return mutex_is_locked(&rtnl_mutex);
125}
126EXPORT_SYMBOL(rtnl_is_locked);
127
128bool refcount_dec_and_rtnl_lock(refcount_t *r)
129{
130 return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
131}
132EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
133
134#ifdef CONFIG_PROVE_LOCKING
135bool lockdep_rtnl_is_held(void)
136{
137 return lockdep_is_held(&rtnl_mutex);
138}
139EXPORT_SYMBOL(lockdep_rtnl_is_held);
140#endif /* #ifdef CONFIG_PROVE_LOCKING */
141
142static struct rtnl_link *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
143
144static inline int rtm_msgindex(int msgtype)
145{
146 int msgindex = msgtype - RTM_BASE;
147
148 /*
149 * msgindex < 0 implies someone tried to register a netlink
150 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
151 * the message type has not been added to linux/rtnetlink.h
152 */
153 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
154
155 return msgindex;
156}
157
158static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
159{
160 struct rtnl_link **tab;
161
162 if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
163 protocol = PF_UNSPEC;
164
165 tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
166 if (!tab)
167 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
168
169 return tab[msgtype];
170}
171
172static int rtnl_register_internal(struct module *owner,
173 int protocol, int msgtype,
174 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
175 unsigned int flags)
176{
177 struct rtnl_link *link, *old;
178 struct rtnl_link __rcu **tab;
179 int msgindex;
180 int ret = -ENOBUFS;
181
182 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
183 msgindex = rtm_msgindex(msgtype);
184
185 rtnl_lock();
186 tab = rtnl_msg_handlers[protocol];
187 if (tab == NULL) {
188 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
189 if (!tab)
190 goto unlock;
191
192 /* ensures we see the 0 stores */
193 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
194 }
195
196 old = rtnl_dereference(tab[msgindex]);
197 if (old) {
198 link = kmemdup(old, sizeof(*old), GFP_KERNEL);
199 if (!link)
200 goto unlock;
201 } else {
202 link = kzalloc(sizeof(*link), GFP_KERNEL);
203 if (!link)
204 goto unlock;
205 }
206
207 WARN_ON(link->owner && link->owner != owner);
208 link->owner = owner;
209
210 WARN_ON(doit && link->doit && link->doit != doit);
211 if (doit)
212 link->doit = doit;
213 WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
214 if (dumpit)
215 link->dumpit = dumpit;
216
217 link->flags |= flags;
218
219 /* publish protocol:msgtype */
220 rcu_assign_pointer(tab[msgindex], link);
221 ret = 0;
222 if (old)
223 kfree_rcu(old, rcu);
224unlock:
225 rtnl_unlock();
226 return ret;
227}
228
229/**
230 * rtnl_register_module - Register a rtnetlink message type
231 *
232 * @owner: module registering the hook (THIS_MODULE)
233 * @protocol: Protocol family or PF_UNSPEC
234 * @msgtype: rtnetlink message type
235 * @doit: Function pointer called for each request message
236 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
237 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
238 *
239 * Like rtnl_register, but for use by removable modules.
240 */
241int rtnl_register_module(struct module *owner,
242 int protocol, int msgtype,
243 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
244 unsigned int flags)
245{
246 return rtnl_register_internal(owner, protocol, msgtype,
247 doit, dumpit, flags);
248}
249EXPORT_SYMBOL_GPL(rtnl_register_module);
250
251/**
252 * rtnl_register - Register a rtnetlink message type
253 * @protocol: Protocol family or PF_UNSPEC
254 * @msgtype: rtnetlink message type
255 * @doit: Function pointer called for each request message
256 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
257 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
258 *
259 * Registers the specified function pointers (at least one of them has
260 * to be non-NULL) to be called whenever a request message for the
261 * specified protocol family and message type is received.
262 *
263 * The special protocol family PF_UNSPEC may be used to define fallback
264 * function pointers for the case when no entry for the specific protocol
265 * family exists.
266 */
267void rtnl_register(int protocol, int msgtype,
268 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
269 unsigned int flags)
270{
271 int err;
272
273 err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
274 flags);
275 if (err)
276 pr_err("Unable to register rtnetlink message handler, "
277 "protocol = %d, message type = %d\n", protocol, msgtype);
278}
279
280/**
281 * rtnl_unregister - Unregister a rtnetlink message type
282 * @protocol: Protocol family or PF_UNSPEC
283 * @msgtype: rtnetlink message type
284 *
285 * Returns 0 on success or a negative error code.
286 */
287int rtnl_unregister(int protocol, int msgtype)
288{
289 struct rtnl_link **tab, *link;
290 int msgindex;
291
292 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
293 msgindex = rtm_msgindex(msgtype);
294
295 rtnl_lock();
296 tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
297 if (!tab) {
298 rtnl_unlock();
299 return -ENOENT;
300 }
301
302 link = tab[msgindex];
303 rcu_assign_pointer(tab[msgindex], NULL);
304 rtnl_unlock();
305
306 kfree_rcu(link, rcu);
307
308 return 0;
309}
310EXPORT_SYMBOL_GPL(rtnl_unregister);
311
312/**
313 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
314 * @protocol : Protocol family or PF_UNSPEC
315 *
316 * Identical to calling rtnl_unregster() for all registered message types
317 * of a certain protocol family.
318 */
319void rtnl_unregister_all(int protocol)
320{
321 struct rtnl_link **tab, *link;
322 int msgindex;
323
324 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
325
326 rtnl_lock();
327 tab = rtnl_msg_handlers[protocol];
328 if (!tab) {
329 rtnl_unlock();
330 return;
331 }
332 RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
333 for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
334 link = tab[msgindex];
335 if (!link)
336 continue;
337
338 rcu_assign_pointer(tab[msgindex], NULL);
339 kfree_rcu(link, rcu);
340 }
341 rtnl_unlock();
342
343 synchronize_net();
344
345 kfree(tab);
346}
347EXPORT_SYMBOL_GPL(rtnl_unregister_all);
348
349static LIST_HEAD(link_ops);
350
351static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
352{
353 const struct rtnl_link_ops *ops;
354
355 list_for_each_entry(ops, &link_ops, list) {
356 if (!strcmp(ops->kind, kind))
357 return ops;
358 }
359 return NULL;
360}
361
362/**
363 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
364 * @ops: struct rtnl_link_ops * to register
365 *
366 * The caller must hold the rtnl_mutex. This function should be used
367 * by drivers that create devices during module initialization. It
368 * must be called before registering the devices.
369 *
370 * Returns 0 on success or a negative error code.
371 */
372int __rtnl_link_register(struct rtnl_link_ops *ops)
373{
374 if (rtnl_link_ops_get(ops->kind))
375 return -EEXIST;
376
377 /* The check for setup is here because if ops
378 * does not have that filled up, it is not possible
379 * to use the ops for creating device. So do not
380 * fill up dellink as well. That disables rtnl_dellink.
381 */
382 if (ops->setup && !ops->dellink)
383 ops->dellink = unregister_netdevice_queue;
384
385 list_add_tail(&ops->list, &link_ops);
386 return 0;
387}
388EXPORT_SYMBOL_GPL(__rtnl_link_register);
389
390/**
391 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
392 * @ops: struct rtnl_link_ops * to register
393 *
394 * Returns 0 on success or a negative error code.
395 */
396int rtnl_link_register(struct rtnl_link_ops *ops)
397{
398 int err;
399
400 /* Sanity-check max sizes to avoid stack buffer overflow. */
401 if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
402 ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
403 return -EINVAL;
404
405 rtnl_lock();
406 err = __rtnl_link_register(ops);
407 rtnl_unlock();
408 return err;
409}
410EXPORT_SYMBOL_GPL(rtnl_link_register);
411
412static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
413{
414 struct net_device *dev;
415 LIST_HEAD(list_kill);
416
417 for_each_netdev(net, dev) {
418 if (dev->rtnl_link_ops == ops)
419 ops->dellink(dev, &list_kill);
420 }
421 unregister_netdevice_many(&list_kill);
422}
423
424/**
425 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
426 * @ops: struct rtnl_link_ops * to unregister
427 *
428 * The caller must hold the rtnl_mutex and guarantee net_namespace_list
429 * integrity (hold pernet_ops_rwsem for writing to close the race
430 * with setup_net() and cleanup_net()).
431 */
432void __rtnl_link_unregister(struct rtnl_link_ops *ops)
433{
434 struct net *net;
435
436 for_each_net(net) {
437 __rtnl_kill_links(net, ops);
438 }
439 list_del(&ops->list);
440}
441EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
442
443/* Return with the rtnl_lock held when there are no network
444 * devices unregistering in any network namespace.
445 */
446static void rtnl_lock_unregistering_all(void)
447{
448 struct net *net;
449 bool unregistering;
450 DEFINE_WAIT_FUNC(wait, woken_wake_function);
451
452 add_wait_queue(&netdev_unregistering_wq, &wait);
453 for (;;) {
454 unregistering = false;
455 rtnl_lock();
456 /* We held write locked pernet_ops_rwsem, and parallel
457 * setup_net() and cleanup_net() are not possible.
458 */
459 for_each_net(net) {
460 if (net->dev_unreg_count > 0) {
461 unregistering = true;
462 break;
463 }
464 }
465 if (!unregistering)
466 break;
467 __rtnl_unlock();
468
469 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
470 }
471 remove_wait_queue(&netdev_unregistering_wq, &wait);
472}
473
474/**
475 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
476 * @ops: struct rtnl_link_ops * to unregister
477 */
478void rtnl_link_unregister(struct rtnl_link_ops *ops)
479{
480 /* Close the race with setup_net() and cleanup_net() */
481 down_write(&pernet_ops_rwsem);
482 rtnl_lock_unregistering_all();
483 __rtnl_link_unregister(ops);
484 rtnl_unlock();
485 up_write(&pernet_ops_rwsem);
486}
487EXPORT_SYMBOL_GPL(rtnl_link_unregister);
488
489static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
490{
491 struct net_device *master_dev;
492 const struct rtnl_link_ops *ops;
493 size_t size = 0;
494
495 rcu_read_lock();
496
497 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
498 if (!master_dev)
499 goto out;
500
501 ops = master_dev->rtnl_link_ops;
502 if (!ops || !ops->get_slave_size)
503 goto out;
504 /* IFLA_INFO_SLAVE_DATA + nested data */
505 size = nla_total_size(sizeof(struct nlattr)) +
506 ops->get_slave_size(master_dev, dev);
507
508out:
509 rcu_read_unlock();
510 return size;
511}
512
513static size_t rtnl_link_get_size(const struct net_device *dev)
514{
515 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
516 size_t size;
517
518 if (!ops)
519 return 0;
520
521 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
522 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
523
524 if (ops->get_size)
525 /* IFLA_INFO_DATA + nested data */
526 size += nla_total_size(sizeof(struct nlattr)) +
527 ops->get_size(dev);
528
529 if (ops->get_xstats_size)
530 /* IFLA_INFO_XSTATS */
531 size += nla_total_size(ops->get_xstats_size(dev));
532
533 size += rtnl_link_get_slave_info_data_size(dev);
534
535 return size;
536}
537
538static LIST_HEAD(rtnl_af_ops);
539
540static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
541{
542 const struct rtnl_af_ops *ops;
543
544 list_for_each_entry_rcu(ops, &rtnl_af_ops, list) {
545 if (ops->family == family)
546 return ops;
547 }
548
549 return NULL;
550}
551
552/**
553 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
554 * @ops: struct rtnl_af_ops * to register
555 *
556 * Returns 0 on success or a negative error code.
557 */
558void rtnl_af_register(struct rtnl_af_ops *ops)
559{
560 rtnl_lock();
561 list_add_tail_rcu(&ops->list, &rtnl_af_ops);
562 rtnl_unlock();
563}
564EXPORT_SYMBOL_GPL(rtnl_af_register);
565
566/**
567 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
568 * @ops: struct rtnl_af_ops * to unregister
569 */
570void rtnl_af_unregister(struct rtnl_af_ops *ops)
571{
572 rtnl_lock();
573 list_del_rcu(&ops->list);
574 rtnl_unlock();
575
576 synchronize_rcu();
577}
578EXPORT_SYMBOL_GPL(rtnl_af_unregister);
579
580static size_t rtnl_link_get_af_size(const struct net_device *dev,
581 u32 ext_filter_mask)
582{
583 struct rtnl_af_ops *af_ops;
584 size_t size;
585
586 /* IFLA_AF_SPEC */
587 size = nla_total_size(sizeof(struct nlattr));
588
589 rcu_read_lock();
590 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
591 if (af_ops->get_link_af_size) {
592 /* AF_* + nested data */
593 size += nla_total_size(sizeof(struct nlattr)) +
594 af_ops->get_link_af_size(dev, ext_filter_mask);
595 }
596 }
597 rcu_read_unlock();
598
599 return size;
600}
601
602static bool rtnl_have_link_slave_info(const struct net_device *dev)
603{
604 struct net_device *master_dev;
605 bool ret = false;
606
607 rcu_read_lock();
608
609 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
610 if (master_dev && master_dev->rtnl_link_ops)
611 ret = true;
612 rcu_read_unlock();
613 return ret;
614}
615
616static int rtnl_link_slave_info_fill(struct sk_buff *skb,
617 const struct net_device *dev)
618{
619 struct net_device *master_dev;
620 const struct rtnl_link_ops *ops;
621 struct nlattr *slave_data;
622 int err;
623
624 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
625 if (!master_dev)
626 return 0;
627 ops = master_dev->rtnl_link_ops;
628 if (!ops)
629 return 0;
630 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
631 return -EMSGSIZE;
632 if (ops->fill_slave_info) {
633 slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA);
634 if (!slave_data)
635 return -EMSGSIZE;
636 err = ops->fill_slave_info(skb, master_dev, dev);
637 if (err < 0)
638 goto err_cancel_slave_data;
639 nla_nest_end(skb, slave_data);
640 }
641 return 0;
642
643err_cancel_slave_data:
644 nla_nest_cancel(skb, slave_data);
645 return err;
646}
647
648static int rtnl_link_info_fill(struct sk_buff *skb,
649 const struct net_device *dev)
650{
651 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
652 struct nlattr *data;
653 int err;
654
655 if (!ops)
656 return 0;
657 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
658 return -EMSGSIZE;
659 if (ops->fill_xstats) {
660 err = ops->fill_xstats(skb, dev);
661 if (err < 0)
662 return err;
663 }
664 if (ops->fill_info) {
665 data = nla_nest_start_noflag(skb, IFLA_INFO_DATA);
666 if (data == NULL)
667 return -EMSGSIZE;
668 err = ops->fill_info(skb, dev);
669 if (err < 0)
670 goto err_cancel_data;
671 nla_nest_end(skb, data);
672 }
673 return 0;
674
675err_cancel_data:
676 nla_nest_cancel(skb, data);
677 return err;
678}
679
680static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
681{
682 struct nlattr *linkinfo;
683 int err = -EMSGSIZE;
684
685 linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO);
686 if (linkinfo == NULL)
687 goto out;
688
689 err = rtnl_link_info_fill(skb, dev);
690 if (err < 0)
691 goto err_cancel_link;
692
693 err = rtnl_link_slave_info_fill(skb, dev);
694 if (err < 0)
695 goto err_cancel_link;
696
697 nla_nest_end(skb, linkinfo);
698 return 0;
699
700err_cancel_link:
701 nla_nest_cancel(skb, linkinfo);
702out:
703 return err;
704}
705
706int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
707{
708 struct sock *rtnl = net->rtnl;
709 int err = 0;
710
711 NETLINK_CB(skb).dst_group = group;
712 if (echo)
713 refcount_inc(&skb->users);
714 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
715 if (echo)
716 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
717 return err;
718}
719
720int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
721{
722 struct sock *rtnl = net->rtnl;
723
724 return nlmsg_unicast(rtnl, skb, pid);
725}
726EXPORT_SYMBOL(rtnl_unicast);
727
728void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
729 struct nlmsghdr *nlh, gfp_t flags)
730{
731 struct sock *rtnl = net->rtnl;
732 int report = 0;
733
734 if (nlh)
735 report = nlmsg_report(nlh);
736
737 nlmsg_notify(rtnl, skb, pid, group, report, flags);
738}
739EXPORT_SYMBOL(rtnl_notify);
740
741void rtnl_set_sk_err(struct net *net, u32 group, int error)
742{
743 struct sock *rtnl = net->rtnl;
744
745 netlink_set_err(rtnl, 0, group, error);
746}
747EXPORT_SYMBOL(rtnl_set_sk_err);
748
749int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
750{
751 struct nlattr *mx;
752 int i, valid = 0;
753
754 /* nothing is dumped for dst_default_metrics, so just skip the loop */
755 if (metrics == dst_default_metrics.metrics)
756 return 0;
757
758 mx = nla_nest_start_noflag(skb, RTA_METRICS);
759 if (mx == NULL)
760 return -ENOBUFS;
761
762 for (i = 0; i < RTAX_MAX; i++) {
763 if (metrics[i]) {
764 if (i == RTAX_CC_ALGO - 1) {
765 char tmp[TCP_CA_NAME_MAX], *name;
766
767 name = tcp_ca_get_name_by_key(metrics[i], tmp);
768 if (!name)
769 continue;
770 if (nla_put_string(skb, i + 1, name))
771 goto nla_put_failure;
772 } else if (i == RTAX_FEATURES - 1) {
773 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
774
775 if (!user_features)
776 continue;
777 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
778 if (nla_put_u32(skb, i + 1, user_features))
779 goto nla_put_failure;
780 } else {
781 if (nla_put_u32(skb, i + 1, metrics[i]))
782 goto nla_put_failure;
783 }
784 valid++;
785 }
786 }
787
788 if (!valid) {
789 nla_nest_cancel(skb, mx);
790 return 0;
791 }
792
793 return nla_nest_end(skb, mx);
794
795nla_put_failure:
796 nla_nest_cancel(skb, mx);
797 return -EMSGSIZE;
798}
799EXPORT_SYMBOL(rtnetlink_put_metrics);
800
801int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
802 long expires, u32 error)
803{
804 struct rta_cacheinfo ci = {
805 .rta_error = error,
806 .rta_id = id,
807 };
808
809 if (dst) {
810 ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
811 ci.rta_used = dst->__use;
812 ci.rta_clntref = atomic_read(&dst->__refcnt);
813 }
814 if (expires) {
815 unsigned long clock;
816
817 clock = jiffies_to_clock_t(abs(expires));
818 clock = min_t(unsigned long, clock, INT_MAX);
819 ci.rta_expires = (expires > 0) ? clock : -clock;
820 }
821 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
822}
823EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
824
825static void set_operstate(struct net_device *dev, unsigned char transition)
826{
827 unsigned char operstate = dev->operstate;
828
829 switch (transition) {
830 case IF_OPER_UP:
831 if ((operstate == IF_OPER_DORMANT ||
832 operstate == IF_OPER_TESTING ||
833 operstate == IF_OPER_UNKNOWN) &&
834 !netif_dormant(dev) && !netif_testing(dev))
835 operstate = IF_OPER_UP;
836 break;
837
838 case IF_OPER_TESTING:
839 if (operstate == IF_OPER_UP ||
840 operstate == IF_OPER_UNKNOWN)
841 operstate = IF_OPER_TESTING;
842 break;
843
844 case IF_OPER_DORMANT:
845 if (operstate == IF_OPER_UP ||
846 operstate == IF_OPER_UNKNOWN)
847 operstate = IF_OPER_DORMANT;
848 break;
849 }
850
851 if (dev->operstate != operstate) {
852 write_lock_bh(&dev_base_lock);
853 dev->operstate = operstate;
854 write_unlock_bh(&dev_base_lock);
855 netdev_state_change(dev);
856 }
857}
858
859static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
860{
861 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
862 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
863}
864
865static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
866 const struct ifinfomsg *ifm)
867{
868 unsigned int flags = ifm->ifi_flags;
869
870 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
871 if (ifm->ifi_change)
872 flags = (flags & ifm->ifi_change) |
873 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
874
875 return flags;
876}
877
878static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
879 const struct rtnl_link_stats64 *b)
880{
881 a->rx_packets = b->rx_packets;
882 a->tx_packets = b->tx_packets;
883 a->rx_bytes = b->rx_bytes;
884 a->tx_bytes = b->tx_bytes;
885 a->rx_errors = b->rx_errors;
886 a->tx_errors = b->tx_errors;
887 a->rx_dropped = b->rx_dropped;
888 a->tx_dropped = b->tx_dropped;
889
890 a->multicast = b->multicast;
891 a->collisions = b->collisions;
892
893 a->rx_length_errors = b->rx_length_errors;
894 a->rx_over_errors = b->rx_over_errors;
895 a->rx_crc_errors = b->rx_crc_errors;
896 a->rx_frame_errors = b->rx_frame_errors;
897 a->rx_fifo_errors = b->rx_fifo_errors;
898 a->rx_missed_errors = b->rx_missed_errors;
899
900 a->tx_aborted_errors = b->tx_aborted_errors;
901 a->tx_carrier_errors = b->tx_carrier_errors;
902 a->tx_fifo_errors = b->tx_fifo_errors;
903 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
904 a->tx_window_errors = b->tx_window_errors;
905
906 a->rx_compressed = b->rx_compressed;
907 a->tx_compressed = b->tx_compressed;
908
909 a->rx_nohandler = b->rx_nohandler;
910}
911
912/* All VF info */
913static inline int rtnl_vfinfo_size(const struct net_device *dev,
914 u32 ext_filter_mask)
915{
916 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
917 int num_vfs = dev_num_vf(dev->dev.parent);
918 size_t size = nla_total_size(0);
919 size += num_vfs *
920 (nla_total_size(0) +
921 nla_total_size(sizeof(struct ifla_vf_mac)) +
922 nla_total_size(sizeof(struct ifla_vf_broadcast)) +
923 nla_total_size(sizeof(struct ifla_vf_vlan)) +
924 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
925 nla_total_size(MAX_VLAN_LIST_LEN *
926 sizeof(struct ifla_vf_vlan_info)) +
927 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
928 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
929 nla_total_size(sizeof(struct ifla_vf_rate)) +
930 nla_total_size(sizeof(struct ifla_vf_link_state)) +
931 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
932 nla_total_size(0) + /* nest IFLA_VF_STATS */
933 /* IFLA_VF_STATS_RX_PACKETS */
934 nla_total_size_64bit(sizeof(__u64)) +
935 /* IFLA_VF_STATS_TX_PACKETS */
936 nla_total_size_64bit(sizeof(__u64)) +
937 /* IFLA_VF_STATS_RX_BYTES */
938 nla_total_size_64bit(sizeof(__u64)) +
939 /* IFLA_VF_STATS_TX_BYTES */
940 nla_total_size_64bit(sizeof(__u64)) +
941 /* IFLA_VF_STATS_BROADCAST */
942 nla_total_size_64bit(sizeof(__u64)) +
943 /* IFLA_VF_STATS_MULTICAST */
944 nla_total_size_64bit(sizeof(__u64)) +
945 /* IFLA_VF_STATS_RX_DROPPED */
946 nla_total_size_64bit(sizeof(__u64)) +
947 /* IFLA_VF_STATS_TX_DROPPED */
948 nla_total_size_64bit(sizeof(__u64)) +
949 nla_total_size(sizeof(struct ifla_vf_trust)));
950 return size;
951 } else
952 return 0;
953}
954
955static size_t rtnl_port_size(const struct net_device *dev,
956 u32 ext_filter_mask)
957{
958 size_t port_size = nla_total_size(4) /* PORT_VF */
959 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
960 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
961 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
962 + nla_total_size(1) /* PROT_VDP_REQUEST */
963 + nla_total_size(2); /* PORT_VDP_RESPONSE */
964 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
965 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
966 + port_size;
967 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
968 + port_size;
969
970 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
971 !(ext_filter_mask & RTEXT_FILTER_VF))
972 return 0;
973 if (dev_num_vf(dev->dev.parent))
974 return port_self_size + vf_ports_size +
975 vf_port_size * dev_num_vf(dev->dev.parent);
976 else
977 return port_self_size;
978}
979
980static size_t rtnl_xdp_size(void)
981{
982 size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */
983 nla_total_size(1) + /* XDP_ATTACHED */
984 nla_total_size(4) + /* XDP_PROG_ID (or 1st mode) */
985 nla_total_size(4); /* XDP_<mode>_PROG_ID */
986
987 return xdp_size;
988}
989
990static size_t rtnl_prop_list_size(const struct net_device *dev)
991{
992 struct netdev_name_node *name_node;
993 size_t size;
994
995 if (list_empty(&dev->name_node->list))
996 return 0;
997 size = nla_total_size(0);
998 list_for_each_entry(name_node, &dev->name_node->list, list)
999 size += nla_total_size(ALTIFNAMSIZ);
1000 return size;
1001}
1002
1003static size_t rtnl_proto_down_size(const struct net_device *dev)
1004{
1005 size_t size = nla_total_size(1);
1006
1007 if (dev->proto_down_reason)
1008 size += nla_total_size(0) + nla_total_size(4);
1009
1010 return size;
1011}
1012
1013static noinline size_t if_nlmsg_size(const struct net_device *dev,
1014 u32 ext_filter_mask)
1015{
1016 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
1017 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
1018 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
1019 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
1020 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
1021 + nla_total_size(sizeof(struct rtnl_link_stats))
1022 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
1023 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
1024 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
1025 + nla_total_size(4) /* IFLA_TXQLEN */
1026 + nla_total_size(4) /* IFLA_WEIGHT */
1027 + nla_total_size(4) /* IFLA_MTU */
1028 + nla_total_size(4) /* IFLA_LINK */
1029 + nla_total_size(4) /* IFLA_MASTER */
1030 + nla_total_size(1) /* IFLA_CARRIER */
1031 + nla_total_size(4) /* IFLA_PROMISCUITY */
1032 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1033 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1034 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1035 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
1036 + nla_total_size(1) /* IFLA_OPERSTATE */
1037 + nla_total_size(1) /* IFLA_LINKMODE */
1038 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1039 + nla_total_size(4) /* IFLA_LINK_NETNSID */
1040 + nla_total_size(4) /* IFLA_GROUP */
1041 + nla_total_size(ext_filter_mask
1042 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1043 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1044 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1045 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1046 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1047 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1048 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1049 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1050 + rtnl_xdp_size() /* IFLA_XDP */
1051 + nla_total_size(4) /* IFLA_EVENT */
1052 + nla_total_size(4) /* IFLA_NEW_NETNSID */
1053 + nla_total_size(4) /* IFLA_NEW_IFINDEX */
1054 + rtnl_proto_down_size(dev) /* proto down */
1055 + nla_total_size(4) /* IFLA_TARGET_NETNSID */
1056 + nla_total_size(4) /* IFLA_CARRIER_UP_COUNT */
1057 + nla_total_size(4) /* IFLA_CARRIER_DOWN_COUNT */
1058 + nla_total_size(4) /* IFLA_MIN_MTU */
1059 + nla_total_size(4) /* IFLA_MAX_MTU */
1060 + rtnl_prop_list_size(dev)
1061 + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
1062 + 0;
1063}
1064
1065static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1066{
1067 struct nlattr *vf_ports;
1068 struct nlattr *vf_port;
1069 int vf;
1070 int err;
1071
1072 vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
1073 if (!vf_ports)
1074 return -EMSGSIZE;
1075
1076 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1077 vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
1078 if (!vf_port)
1079 goto nla_put_failure;
1080 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1081 goto nla_put_failure;
1082 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1083 if (err == -EMSGSIZE)
1084 goto nla_put_failure;
1085 if (err) {
1086 nla_nest_cancel(skb, vf_port);
1087 continue;
1088 }
1089 nla_nest_end(skb, vf_port);
1090 }
1091
1092 nla_nest_end(skb, vf_ports);
1093
1094 return 0;
1095
1096nla_put_failure:
1097 nla_nest_cancel(skb, vf_ports);
1098 return -EMSGSIZE;
1099}
1100
1101static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1102{
1103 struct nlattr *port_self;
1104 int err;
1105
1106 port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
1107 if (!port_self)
1108 return -EMSGSIZE;
1109
1110 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1111 if (err) {
1112 nla_nest_cancel(skb, port_self);
1113 return (err == -EMSGSIZE) ? err : 0;
1114 }
1115
1116 nla_nest_end(skb, port_self);
1117
1118 return 0;
1119}
1120
1121static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1122 u32 ext_filter_mask)
1123{
1124 int err;
1125
1126 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1127 !(ext_filter_mask & RTEXT_FILTER_VF))
1128 return 0;
1129
1130 err = rtnl_port_self_fill(skb, dev);
1131 if (err)
1132 return err;
1133
1134 if (dev_num_vf(dev->dev.parent)) {
1135 err = rtnl_vf_ports_fill(skb, dev);
1136 if (err)
1137 return err;
1138 }
1139
1140 return 0;
1141}
1142
1143static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1144{
1145 int err;
1146 struct netdev_phys_item_id ppid;
1147
1148 err = dev_get_phys_port_id(dev, &ppid);
1149 if (err) {
1150 if (err == -EOPNOTSUPP)
1151 return 0;
1152 return err;
1153 }
1154
1155 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1156 return -EMSGSIZE;
1157
1158 return 0;
1159}
1160
1161static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1162{
1163 char name[IFNAMSIZ];
1164 int err;
1165
1166 err = dev_get_phys_port_name(dev, name, sizeof(name));
1167 if (err) {
1168 if (err == -EOPNOTSUPP)
1169 return 0;
1170 return err;
1171 }
1172
1173 if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1174 return -EMSGSIZE;
1175
1176 return 0;
1177}
1178
1179static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1180{
1181 struct netdev_phys_item_id ppid = { };
1182 int err;
1183
1184 err = dev_get_port_parent_id(dev, &ppid, false);
1185 if (err) {
1186 if (err == -EOPNOTSUPP)
1187 return 0;
1188 return err;
1189 }
1190
1191 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
1192 return -EMSGSIZE;
1193
1194 return 0;
1195}
1196
1197static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1198 struct net_device *dev)
1199{
1200 struct rtnl_link_stats64 *sp;
1201 struct nlattr *attr;
1202
1203 attr = nla_reserve_64bit(skb, IFLA_STATS64,
1204 sizeof(struct rtnl_link_stats64), IFLA_PAD);
1205 if (!attr)
1206 return -EMSGSIZE;
1207
1208 sp = nla_data(attr);
1209 dev_get_stats(dev, sp);
1210
1211 attr = nla_reserve(skb, IFLA_STATS,
1212 sizeof(struct rtnl_link_stats));
1213 if (!attr)
1214 return -EMSGSIZE;
1215
1216 copy_rtnl_link_stats(nla_data(attr), sp);
1217
1218 return 0;
1219}
1220
1221static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1222 struct net_device *dev,
1223 int vfs_num,
1224 struct nlattr *vfinfo)
1225{
1226 struct ifla_vf_rss_query_en vf_rss_query_en;
1227 struct nlattr *vf, *vfstats, *vfvlanlist;
1228 struct ifla_vf_link_state vf_linkstate;
1229 struct ifla_vf_vlan_info vf_vlan_info;
1230 struct ifla_vf_spoofchk vf_spoofchk;
1231 struct ifla_vf_tx_rate vf_tx_rate;
1232 struct ifla_vf_stats vf_stats;
1233 struct ifla_vf_trust vf_trust;
1234 struct ifla_vf_vlan vf_vlan;
1235 struct ifla_vf_rate vf_rate;
1236 struct ifla_vf_mac vf_mac;
1237 struct ifla_vf_broadcast vf_broadcast;
1238 struct ifla_vf_info ivi;
1239 struct ifla_vf_guid node_guid;
1240 struct ifla_vf_guid port_guid;
1241
1242 memset(&ivi, 0, sizeof(ivi));
1243
1244 /* Not all SR-IOV capable drivers support the
1245 * spoofcheck and "RSS query enable" query. Preset to
1246 * -1 so the user space tool can detect that the driver
1247 * didn't report anything.
1248 */
1249 ivi.spoofchk = -1;
1250 ivi.rss_query_en = -1;
1251 ivi.trusted = -1;
1252 /* The default value for VF link state is "auto"
1253 * IFLA_VF_LINK_STATE_AUTO which equals zero
1254 */
1255 ivi.linkstate = 0;
1256 /* VLAN Protocol by default is 802.1Q */
1257 ivi.vlan_proto = htons(ETH_P_8021Q);
1258 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1259 return 0;
1260
1261 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1262 memset(&node_guid, 0, sizeof(node_guid));
1263 memset(&port_guid, 0, sizeof(port_guid));
1264
1265 vf_mac.vf =
1266 vf_vlan.vf =
1267 vf_vlan_info.vf =
1268 vf_rate.vf =
1269 vf_tx_rate.vf =
1270 vf_spoofchk.vf =
1271 vf_linkstate.vf =
1272 vf_rss_query_en.vf =
1273 vf_trust.vf =
1274 node_guid.vf =
1275 port_guid.vf = ivi.vf;
1276
1277 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1278 memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
1279 vf_vlan.vlan = ivi.vlan;
1280 vf_vlan.qos = ivi.qos;
1281 vf_vlan_info.vlan = ivi.vlan;
1282 vf_vlan_info.qos = ivi.qos;
1283 vf_vlan_info.vlan_proto = ivi.vlan_proto;
1284 vf_tx_rate.rate = ivi.max_tx_rate;
1285 vf_rate.min_tx_rate = ivi.min_tx_rate;
1286 vf_rate.max_tx_rate = ivi.max_tx_rate;
1287 vf_spoofchk.setting = ivi.spoofchk;
1288 vf_linkstate.link_state = ivi.linkstate;
1289 vf_rss_query_en.setting = ivi.rss_query_en;
1290 vf_trust.setting = ivi.trusted;
1291 vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1292 if (!vf)
1293 goto nla_put_vfinfo_failure;
1294 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1295 nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
1296 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1297 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1298 &vf_rate) ||
1299 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1300 &vf_tx_rate) ||
1301 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1302 &vf_spoofchk) ||
1303 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1304 &vf_linkstate) ||
1305 nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1306 sizeof(vf_rss_query_en),
1307 &vf_rss_query_en) ||
1308 nla_put(skb, IFLA_VF_TRUST,
1309 sizeof(vf_trust), &vf_trust))
1310 goto nla_put_vf_failure;
1311
1312 if (dev->netdev_ops->ndo_get_vf_guid &&
1313 !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
1314 &port_guid)) {
1315 if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
1316 &node_guid) ||
1317 nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
1318 &port_guid))
1319 goto nla_put_vf_failure;
1320 }
1321 vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1322 if (!vfvlanlist)
1323 goto nla_put_vf_failure;
1324 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1325 &vf_vlan_info)) {
1326 nla_nest_cancel(skb, vfvlanlist);
1327 goto nla_put_vf_failure;
1328 }
1329 nla_nest_end(skb, vfvlanlist);
1330 memset(&vf_stats, 0, sizeof(vf_stats));
1331 if (dev->netdev_ops->ndo_get_vf_stats)
1332 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1333 &vf_stats);
1334 vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1335 if (!vfstats)
1336 goto nla_put_vf_failure;
1337 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1338 vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1339 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1340 vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1341 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1342 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1343 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1344 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1345 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1346 vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1347 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1348 vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1349 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1350 vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1351 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1352 vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1353 nla_nest_cancel(skb, vfstats);
1354 goto nla_put_vf_failure;
1355 }
1356 nla_nest_end(skb, vfstats);
1357 nla_nest_end(skb, vf);
1358 return 0;
1359
1360nla_put_vf_failure:
1361 nla_nest_cancel(skb, vf);
1362nla_put_vfinfo_failure:
1363 nla_nest_cancel(skb, vfinfo);
1364 return -EMSGSIZE;
1365}
1366
1367static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1368 struct net_device *dev,
1369 u32 ext_filter_mask)
1370{
1371 struct nlattr *vfinfo;
1372 int i, num_vfs;
1373
1374 if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1375 return 0;
1376
1377 num_vfs = dev_num_vf(dev->dev.parent);
1378 if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1379 return -EMSGSIZE;
1380
1381 if (!dev->netdev_ops->ndo_get_vf_config)
1382 return 0;
1383
1384 vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1385 if (!vfinfo)
1386 return -EMSGSIZE;
1387
1388 for (i = 0; i < num_vfs; i++) {
1389 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1390 return -EMSGSIZE;
1391 }
1392
1393 nla_nest_end(skb, vfinfo);
1394 return 0;
1395}
1396
1397static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1398{
1399 struct rtnl_link_ifmap map;
1400
1401 memset(&map, 0, sizeof(map));
1402 map.mem_start = dev->mem_start;
1403 map.mem_end = dev->mem_end;
1404 map.base_addr = dev->base_addr;
1405 map.irq = dev->irq;
1406 map.dma = dev->dma;
1407 map.port = dev->if_port;
1408
1409 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1410 return -EMSGSIZE;
1411
1412 return 0;
1413}
1414
1415static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1416{
1417 const struct bpf_prog *generic_xdp_prog;
1418
1419 ASSERT_RTNL();
1420
1421 generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1422 if (!generic_xdp_prog)
1423 return 0;
1424 return generic_xdp_prog->aux->id;
1425}
1426
1427static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1428{
1429 return dev_xdp_prog_id(dev, XDP_MODE_DRV);
1430}
1431
1432static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1433{
1434 return dev_xdp_prog_id(dev, XDP_MODE_HW);
1435}
1436
1437static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1438 u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1439 u32 (*get_prog_id)(struct net_device *dev))
1440{
1441 u32 curr_id;
1442 int err;
1443
1444 curr_id = get_prog_id(dev);
1445 if (!curr_id)
1446 return 0;
1447
1448 *prog_id = curr_id;
1449 err = nla_put_u32(skb, attr, curr_id);
1450 if (err)
1451 return err;
1452
1453 if (*mode != XDP_ATTACHED_NONE)
1454 *mode = XDP_ATTACHED_MULTI;
1455 else
1456 *mode = tgt_mode;
1457
1458 return 0;
1459}
1460
1461static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1462{
1463 struct nlattr *xdp;
1464 u32 prog_id;
1465 int err;
1466 u8 mode;
1467
1468 xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1469 if (!xdp)
1470 return -EMSGSIZE;
1471
1472 prog_id = 0;
1473 mode = XDP_ATTACHED_NONE;
1474 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1475 IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1476 if (err)
1477 goto err_cancel;
1478 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1479 IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1480 if (err)
1481 goto err_cancel;
1482 err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1483 IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1484 if (err)
1485 goto err_cancel;
1486
1487 err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1488 if (err)
1489 goto err_cancel;
1490
1491 if (prog_id && mode != XDP_ATTACHED_MULTI) {
1492 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1493 if (err)
1494 goto err_cancel;
1495 }
1496
1497 nla_nest_end(skb, xdp);
1498 return 0;
1499
1500err_cancel:
1501 nla_nest_cancel(skb, xdp);
1502 return err;
1503}
1504
1505static u32 rtnl_get_event(unsigned long event)
1506{
1507 u32 rtnl_event_type = IFLA_EVENT_NONE;
1508
1509 switch (event) {
1510 case NETDEV_REBOOT:
1511 rtnl_event_type = IFLA_EVENT_REBOOT;
1512 break;
1513 case NETDEV_FEAT_CHANGE:
1514 rtnl_event_type = IFLA_EVENT_FEATURES;
1515 break;
1516 case NETDEV_BONDING_FAILOVER:
1517 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1518 break;
1519 case NETDEV_NOTIFY_PEERS:
1520 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1521 break;
1522 case NETDEV_RESEND_IGMP:
1523 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1524 break;
1525 case NETDEV_CHANGEINFODATA:
1526 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1527 break;
1528 default:
1529 break;
1530 }
1531
1532 return rtnl_event_type;
1533}
1534
1535static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1536{
1537 const struct net_device *upper_dev;
1538 int ret = 0;
1539
1540 rcu_read_lock();
1541
1542 upper_dev = netdev_master_upper_dev_get_rcu(dev);
1543 if (upper_dev)
1544 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1545
1546 rcu_read_unlock();
1547 return ret;
1548}
1549
1550static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1551 bool force)
1552{
1553 int ifindex = dev_get_iflink(dev);
1554
1555 if (force || dev->ifindex != ifindex)
1556 return nla_put_u32(skb, IFLA_LINK, ifindex);
1557
1558 return 0;
1559}
1560
1561static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1562 struct net_device *dev)
1563{
1564 char buf[IFALIASZ];
1565 int ret;
1566
1567 ret = dev_get_alias(dev, buf, sizeof(buf));
1568 return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1569}
1570
1571static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1572 const struct net_device *dev,
1573 struct net *src_net, gfp_t gfp)
1574{
1575 bool put_iflink = false;
1576
1577 if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1578 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1579
1580 if (!net_eq(dev_net(dev), link_net)) {
1581 int id = peernet2id_alloc(src_net, link_net, gfp);
1582
1583 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1584 return -EMSGSIZE;
1585
1586 put_iflink = true;
1587 }
1588 }
1589
1590 return nla_put_iflink(skb, dev, put_iflink);
1591}
1592
1593static int rtnl_fill_link_af(struct sk_buff *skb,
1594 const struct net_device *dev,
1595 u32 ext_filter_mask)
1596{
1597 const struct rtnl_af_ops *af_ops;
1598 struct nlattr *af_spec;
1599
1600 af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1601 if (!af_spec)
1602 return -EMSGSIZE;
1603
1604 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1605 struct nlattr *af;
1606 int err;
1607
1608 if (!af_ops->fill_link_af)
1609 continue;
1610
1611 af = nla_nest_start_noflag(skb, af_ops->family);
1612 if (!af)
1613 return -EMSGSIZE;
1614
1615 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1616 /*
1617 * Caller may return ENODATA to indicate that there
1618 * was no data to be dumped. This is not an error, it
1619 * means we should trim the attribute header and
1620 * continue.
1621 */
1622 if (err == -ENODATA)
1623 nla_nest_cancel(skb, af);
1624 else if (err < 0)
1625 return -EMSGSIZE;
1626
1627 nla_nest_end(skb, af);
1628 }
1629
1630 nla_nest_end(skb, af_spec);
1631 return 0;
1632}
1633
1634static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
1635 const struct net_device *dev)
1636{
1637 struct netdev_name_node *name_node;
1638 int count = 0;
1639
1640 list_for_each_entry(name_node, &dev->name_node->list, list) {
1641 if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
1642 return -EMSGSIZE;
1643 count++;
1644 }
1645 return count;
1646}
1647
1648static int rtnl_fill_prop_list(struct sk_buff *skb,
1649 const struct net_device *dev)
1650{
1651 struct nlattr *prop_list;
1652 int ret;
1653
1654 prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
1655 if (!prop_list)
1656 return -EMSGSIZE;
1657
1658 ret = rtnl_fill_alt_ifnames(skb, dev);
1659 if (ret <= 0)
1660 goto nest_cancel;
1661
1662 nla_nest_end(skb, prop_list);
1663 return 0;
1664
1665nest_cancel:
1666 nla_nest_cancel(skb, prop_list);
1667 return ret;
1668}
1669
1670static int rtnl_fill_proto_down(struct sk_buff *skb,
1671 const struct net_device *dev)
1672{
1673 struct nlattr *pr;
1674 u32 preason;
1675
1676 if (nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1677 goto nla_put_failure;
1678
1679 preason = dev->proto_down_reason;
1680 if (!preason)
1681 return 0;
1682
1683 pr = nla_nest_start(skb, IFLA_PROTO_DOWN_REASON);
1684 if (!pr)
1685 return -EMSGSIZE;
1686
1687 if (nla_put_u32(skb, IFLA_PROTO_DOWN_REASON_VALUE, preason)) {
1688 nla_nest_cancel(skb, pr);
1689 goto nla_put_failure;
1690 }
1691
1692 nla_nest_end(skb, pr);
1693 return 0;
1694
1695nla_put_failure:
1696 return -EMSGSIZE;
1697}
1698
1699static int rtnl_fill_ifinfo(struct sk_buff *skb,
1700 struct net_device *dev, struct net *src_net,
1701 int type, u32 pid, u32 seq, u32 change,
1702 unsigned int flags, u32 ext_filter_mask,
1703 u32 event, int *new_nsid, int new_ifindex,
1704 int tgt_netnsid, gfp_t gfp)
1705{
1706 struct ifinfomsg *ifm;
1707 struct nlmsghdr *nlh;
1708
1709 ASSERT_RTNL();
1710 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1711 if (nlh == NULL)
1712 return -EMSGSIZE;
1713
1714 ifm = nlmsg_data(nlh);
1715 ifm->ifi_family = AF_UNSPEC;
1716 ifm->__ifi_pad = 0;
1717 ifm->ifi_type = dev->type;
1718 ifm->ifi_index = dev->ifindex;
1719 ifm->ifi_flags = dev_get_flags(dev);
1720 ifm->ifi_change = change;
1721
1722 if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1723 goto nla_put_failure;
1724
1725 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1726 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1727 nla_put_u8(skb, IFLA_OPERSTATE,
1728 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1729 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1730 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1731 nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1732 nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1733 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1734 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1735 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1736 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1737 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1738#ifdef CONFIG_RPS
1739 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1740#endif
1741 put_master_ifindex(skb, dev) ||
1742 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1743 (dev->qdisc &&
1744 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1745 nla_put_ifalias(skb, dev) ||
1746 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1747 atomic_read(&dev->carrier_up_count) +
1748 atomic_read(&dev->carrier_down_count)) ||
1749 nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1750 atomic_read(&dev->carrier_up_count)) ||
1751 nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1752 atomic_read(&dev->carrier_down_count)))
1753 goto nla_put_failure;
1754
1755 if (rtnl_fill_proto_down(skb, dev))
1756 goto nla_put_failure;
1757
1758 if (event != IFLA_EVENT_NONE) {
1759 if (nla_put_u32(skb, IFLA_EVENT, event))
1760 goto nla_put_failure;
1761 }
1762
1763 if (rtnl_fill_link_ifmap(skb, dev))
1764 goto nla_put_failure;
1765
1766 if (dev->addr_len) {
1767 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1768 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1769 goto nla_put_failure;
1770 }
1771
1772 if (rtnl_phys_port_id_fill(skb, dev))
1773 goto nla_put_failure;
1774
1775 if (rtnl_phys_port_name_fill(skb, dev))
1776 goto nla_put_failure;
1777
1778 if (rtnl_phys_switch_id_fill(skb, dev))
1779 goto nla_put_failure;
1780
1781 if (rtnl_fill_stats(skb, dev))
1782 goto nla_put_failure;
1783
1784 if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1785 goto nla_put_failure;
1786
1787 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1788 goto nla_put_failure;
1789
1790 if (rtnl_xdp_fill(skb, dev))
1791 goto nla_put_failure;
1792
1793 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1794 if (rtnl_link_fill(skb, dev) < 0)
1795 goto nla_put_failure;
1796 }
1797
1798 if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1799 goto nla_put_failure;
1800
1801 if (new_nsid &&
1802 nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1803 goto nla_put_failure;
1804 if (new_ifindex &&
1805 nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1806 goto nla_put_failure;
1807
1808 if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
1809 nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
1810 goto nla_put_failure;
1811
1812 rcu_read_lock();
1813 if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1814 goto nla_put_failure_rcu;
1815 rcu_read_unlock();
1816
1817 if (rtnl_fill_prop_list(skb, dev))
1818 goto nla_put_failure;
1819
1820 nlmsg_end(skb, nlh);
1821 return 0;
1822
1823nla_put_failure_rcu:
1824 rcu_read_unlock();
1825nla_put_failure:
1826 nlmsg_cancel(skb, nlh);
1827 return -EMSGSIZE;
1828}
1829
1830static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1831 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1832 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1833 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1834 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1835 [IFLA_MTU] = { .type = NLA_U32 },
1836 [IFLA_LINK] = { .type = NLA_U32 },
1837 [IFLA_MASTER] = { .type = NLA_U32 },
1838 [IFLA_CARRIER] = { .type = NLA_U8 },
1839 [IFLA_TXQLEN] = { .type = NLA_U32 },
1840 [IFLA_WEIGHT] = { .type = NLA_U32 },
1841 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1842 [IFLA_LINKMODE] = { .type = NLA_U8 },
1843 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1844 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1845 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1846 /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1847 * allow 0-length string (needed to remove an alias).
1848 */
1849 [IFLA_IFALIAS] = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1850 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1851 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1852 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1853 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1854 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1855 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1856 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1857 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1858 [IFLA_GSO_MAX_SEGS] = { .type = NLA_U32 },
1859 [IFLA_GSO_MAX_SIZE] = { .type = NLA_U32 },
1860 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1861 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1862 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1863 [IFLA_LINK_NETNSID] = { .type = NLA_S32 },
1864 [IFLA_PROTO_DOWN] = { .type = NLA_U8 },
1865 [IFLA_XDP] = { .type = NLA_NESTED },
1866 [IFLA_EVENT] = { .type = NLA_U32 },
1867 [IFLA_GROUP] = { .type = NLA_U32 },
1868 [IFLA_TARGET_NETNSID] = { .type = NLA_S32 },
1869 [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1870 [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1871 [IFLA_MIN_MTU] = { .type = NLA_U32 },
1872 [IFLA_MAX_MTU] = { .type = NLA_U32 },
1873 [IFLA_PROP_LIST] = { .type = NLA_NESTED },
1874 [IFLA_ALT_IFNAME] = { .type = NLA_STRING,
1875 .len = ALTIFNAMSIZ - 1 },
1876 [IFLA_PERM_ADDRESS] = { .type = NLA_REJECT },
1877 [IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED },
1878};
1879
1880static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1881 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1882 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1883 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1884 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1885};
1886
1887static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1888 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
1889 [IFLA_VF_BROADCAST] = { .type = NLA_REJECT },
1890 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
1891 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED },
1892 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
1893 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
1894 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) },
1895 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) },
1896 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) },
1897 [IFLA_VF_STATS] = { .type = NLA_NESTED },
1898 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) },
1899 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) },
1900 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) },
1901};
1902
1903static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1904 [IFLA_PORT_VF] = { .type = NLA_U32 },
1905 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1906 .len = PORT_PROFILE_MAX },
1907 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1908 .len = PORT_UUID_MAX },
1909 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1910 .len = PORT_UUID_MAX },
1911 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1912 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1913
1914 /* Unused, but we need to keep it here since user space could
1915 * fill it. It's also broken with regard to NLA_BINARY use in
1916 * combination with structs.
1917 */
1918 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1919 .len = sizeof(struct ifla_port_vsi) },
1920};
1921
1922static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1923 [IFLA_XDP_UNSPEC] = { .strict_start_type = IFLA_XDP_EXPECTED_FD },
1924 [IFLA_XDP_FD] = { .type = NLA_S32 },
1925 [IFLA_XDP_EXPECTED_FD] = { .type = NLA_S32 },
1926 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 },
1927 [IFLA_XDP_FLAGS] = { .type = NLA_U32 },
1928 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 },
1929};
1930
1931static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1932{
1933 const struct rtnl_link_ops *ops = NULL;
1934 struct nlattr *linfo[IFLA_INFO_MAX + 1];
1935
1936 if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
1937 return NULL;
1938
1939 if (linfo[IFLA_INFO_KIND]) {
1940 char kind[MODULE_NAME_LEN];
1941
1942 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1943 ops = rtnl_link_ops_get(kind);
1944 }
1945
1946 return ops;
1947}
1948
1949static bool link_master_filtered(struct net_device *dev, int master_idx)
1950{
1951 struct net_device *master;
1952
1953 if (!master_idx)
1954 return false;
1955
1956 master = netdev_master_upper_dev_get(dev);
1957 if (!master || master->ifindex != master_idx)
1958 return true;
1959
1960 return false;
1961}
1962
1963static bool link_kind_filtered(const struct net_device *dev,
1964 const struct rtnl_link_ops *kind_ops)
1965{
1966 if (kind_ops && dev->rtnl_link_ops != kind_ops)
1967 return true;
1968
1969 return false;
1970}
1971
1972static bool link_dump_filtered(struct net_device *dev,
1973 int master_idx,
1974 const struct rtnl_link_ops *kind_ops)
1975{
1976 if (link_master_filtered(dev, master_idx) ||
1977 link_kind_filtered(dev, kind_ops))
1978 return true;
1979
1980 return false;
1981}
1982
1983/**
1984 * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
1985 * @sk: netlink socket
1986 * @netnsid: network namespace identifier
1987 *
1988 * Returns the network namespace identified by netnsid on success or an error
1989 * pointer on failure.
1990 */
1991struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
1992{
1993 struct net *net;
1994
1995 net = get_net_ns_by_id(sock_net(sk), netnsid);
1996 if (!net)
1997 return ERR_PTR(-EINVAL);
1998
1999 /* For now, the caller is required to have CAP_NET_ADMIN in
2000 * the user namespace owning the target net ns.
2001 */
2002 if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
2003 put_net(net);
2004 return ERR_PTR(-EACCES);
2005 }
2006 return net;
2007}
2008EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
2009
2010static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
2011 bool strict_check, struct nlattr **tb,
2012 struct netlink_ext_ack *extack)
2013{
2014 int hdrlen;
2015
2016 if (strict_check) {
2017 struct ifinfomsg *ifm;
2018
2019 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2020 NL_SET_ERR_MSG(extack, "Invalid header for link dump");
2021 return -EINVAL;
2022 }
2023
2024 ifm = nlmsg_data(nlh);
2025 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2026 ifm->ifi_change) {
2027 NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
2028 return -EINVAL;
2029 }
2030 if (ifm->ifi_index) {
2031 NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
2032 return -EINVAL;
2033 }
2034
2035 return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
2036 IFLA_MAX, ifla_policy,
2037 extack);
2038 }
2039
2040 /* A hack to preserve kernel<->userspace interface.
2041 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
2042 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
2043 * what iproute2 < v3.9.0 used.
2044 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
2045 * attribute, its netlink message is shorter than struct ifinfomsg.
2046 */
2047 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2048 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2049
2050 return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
2051 extack);
2052}
2053
2054static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2055{
2056 struct netlink_ext_ack *extack = cb->extack;
2057 const struct nlmsghdr *nlh = cb->nlh;
2058 struct net *net = sock_net(skb->sk);
2059 struct net *tgt_net = net;
2060 int h, s_h;
2061 int idx = 0, s_idx;
2062 struct net_device *dev;
2063 struct hlist_head *head;
2064 struct nlattr *tb[IFLA_MAX+1];
2065 u32 ext_filter_mask = 0;
2066 const struct rtnl_link_ops *kind_ops = NULL;
2067 unsigned int flags = NLM_F_MULTI;
2068 int master_idx = 0;
2069 int netnsid = -1;
2070 int err, i;
2071
2072 s_h = cb->args[0];
2073 s_idx = cb->args[1];
2074
2075 err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
2076 if (err < 0) {
2077 if (cb->strict_check)
2078 return err;
2079
2080 goto walk_entries;
2081 }
2082
2083 for (i = 0; i <= IFLA_MAX; ++i) {
2084 if (!tb[i])
2085 continue;
2086
2087 /* new attributes should only be added with strict checking */
2088 switch (i) {
2089 case IFLA_TARGET_NETNSID:
2090 netnsid = nla_get_s32(tb[i]);
2091 tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
2092 if (IS_ERR(tgt_net)) {
2093 NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
2094 return PTR_ERR(tgt_net);
2095 }
2096 break;
2097 case IFLA_EXT_MASK:
2098 ext_filter_mask = nla_get_u32(tb[i]);
2099 break;
2100 case IFLA_MASTER:
2101 master_idx = nla_get_u32(tb[i]);
2102 break;
2103 case IFLA_LINKINFO:
2104 kind_ops = linkinfo_to_kind_ops(tb[i]);
2105 break;
2106 default:
2107 if (cb->strict_check) {
2108 NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
2109 return -EINVAL;
2110 }
2111 }
2112 }
2113
2114 if (master_idx || kind_ops)
2115 flags |= NLM_F_DUMP_FILTERED;
2116
2117walk_entries:
2118 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2119 idx = 0;
2120 head = &tgt_net->dev_index_head[h];
2121 hlist_for_each_entry(dev, head, index_hlist) {
2122 if (link_dump_filtered(dev, master_idx, kind_ops))
2123 goto cont;
2124 if (idx < s_idx)
2125 goto cont;
2126 err = rtnl_fill_ifinfo(skb, dev, net,
2127 RTM_NEWLINK,
2128 NETLINK_CB(cb->skb).portid,
2129 nlh->nlmsg_seq, 0, flags,
2130 ext_filter_mask, 0, NULL, 0,
2131 netnsid, GFP_KERNEL);
2132
2133 if (err < 0) {
2134 if (likely(skb->len))
2135 goto out;
2136
2137 goto out_err;
2138 }
2139cont:
2140 idx++;
2141 }
2142 }
2143out:
2144 err = skb->len;
2145out_err:
2146 cb->args[1] = idx;
2147 cb->args[0] = h;
2148 cb->seq = net->dev_base_seq;
2149 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2150 if (netnsid >= 0)
2151 put_net(tgt_net);
2152
2153 return err;
2154}
2155
2156int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2157 struct netlink_ext_ack *exterr)
2158{
2159 return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
2160 exterr);
2161}
2162EXPORT_SYMBOL(rtnl_nla_parse_ifla);
2163
2164struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2165{
2166 struct net *net;
2167 /* Examine the link attributes and figure out which
2168 * network namespace we are talking about.
2169 */
2170 if (tb[IFLA_NET_NS_PID])
2171 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2172 else if (tb[IFLA_NET_NS_FD])
2173 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2174 else
2175 net = get_net(src_net);
2176 return net;
2177}
2178EXPORT_SYMBOL(rtnl_link_get_net);
2179
2180/* Figure out which network namespace we are talking about by
2181 * examining the link attributes in the following order:
2182 *
2183 * 1. IFLA_NET_NS_PID
2184 * 2. IFLA_NET_NS_FD
2185 * 3. IFLA_TARGET_NETNSID
2186 */
2187static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2188 struct nlattr *tb[])
2189{
2190 struct net *net;
2191
2192 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2193 return rtnl_link_get_net(src_net, tb);
2194
2195 if (!tb[IFLA_TARGET_NETNSID])
2196 return get_net(src_net);
2197
2198 net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2199 if (!net)
2200 return ERR_PTR(-EINVAL);
2201
2202 return net;
2203}
2204
2205static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2206 struct net *src_net,
2207 struct nlattr *tb[], int cap)
2208{
2209 struct net *net;
2210
2211 net = rtnl_link_get_net_by_nlattr(src_net, tb);
2212 if (IS_ERR(net))
2213 return net;
2214
2215 if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2216 put_net(net);
2217 return ERR_PTR(-EPERM);
2218 }
2219
2220 return net;
2221}
2222
2223/* Verify that rtnetlink requests do not pass additional properties
2224 * potentially referring to different network namespaces.
2225 */
2226static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2227 struct netlink_ext_ack *extack,
2228 bool netns_id_only)
2229{
2230
2231 if (netns_id_only) {
2232 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2233 return 0;
2234
2235 NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2236 return -EOPNOTSUPP;
2237 }
2238
2239 if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2240 goto invalid_attr;
2241
2242 if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2243 goto invalid_attr;
2244
2245 if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2246 goto invalid_attr;
2247
2248 return 0;
2249
2250invalid_attr:
2251 NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2252 return -EINVAL;
2253}
2254
2255static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
2256{
2257 if (dev) {
2258 if (tb[IFLA_ADDRESS] &&
2259 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2260 return -EINVAL;
2261
2262 if (tb[IFLA_BROADCAST] &&
2263 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2264 return -EINVAL;
2265 }
2266
2267 if (tb[IFLA_AF_SPEC]) {
2268 struct nlattr *af;
2269 int rem, err;
2270
2271 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2272 const struct rtnl_af_ops *af_ops;
2273
2274 rcu_read_lock();
2275 af_ops = rtnl_af_lookup(nla_type(af));
2276 if (!af_ops) {
2277 rcu_read_unlock();
2278 return -EAFNOSUPPORT;
2279 }
2280
2281 if (!af_ops->set_link_af) {
2282 rcu_read_unlock();
2283 return -EOPNOTSUPP;
2284 }
2285
2286 if (af_ops->validate_link_af) {
2287 err = af_ops->validate_link_af(dev, af);
2288 if (err < 0) {
2289 rcu_read_unlock();
2290 return err;
2291 }
2292 }
2293
2294 rcu_read_unlock();
2295 }
2296 }
2297
2298 return 0;
2299}
2300
2301static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2302 int guid_type)
2303{
2304 const struct net_device_ops *ops = dev->netdev_ops;
2305
2306 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2307}
2308
2309static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2310{
2311 if (dev->type != ARPHRD_INFINIBAND)
2312 return -EOPNOTSUPP;
2313
2314 return handle_infiniband_guid(dev, ivt, guid_type);
2315}
2316
2317static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2318{
2319 const struct net_device_ops *ops = dev->netdev_ops;
2320 int err = -EINVAL;
2321
2322 if (tb[IFLA_VF_MAC]) {
2323 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2324
2325 if (ivm->vf >= INT_MAX)
2326 return -EINVAL;
2327 err = -EOPNOTSUPP;
2328 if (ops->ndo_set_vf_mac)
2329 err = ops->ndo_set_vf_mac(dev, ivm->vf,
2330 ivm->mac);
2331 if (err < 0)
2332 return err;
2333 }
2334
2335 if (tb[IFLA_VF_VLAN]) {
2336 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2337
2338 if (ivv->vf >= INT_MAX)
2339 return -EINVAL;
2340 err = -EOPNOTSUPP;
2341 if (ops->ndo_set_vf_vlan)
2342 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2343 ivv->qos,
2344 htons(ETH_P_8021Q));
2345 if (err < 0)
2346 return err;
2347 }
2348
2349 if (tb[IFLA_VF_VLAN_LIST]) {
2350 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2351 struct nlattr *attr;
2352 int rem, len = 0;
2353
2354 err = -EOPNOTSUPP;
2355 if (!ops->ndo_set_vf_vlan)
2356 return err;
2357
2358 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2359 if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2360 nla_len(attr) < NLA_HDRLEN) {
2361 return -EINVAL;
2362 }
2363 if (len >= MAX_VLAN_LIST_LEN)
2364 return -EOPNOTSUPP;
2365 ivvl[len] = nla_data(attr);
2366
2367 len++;
2368 }
2369 if (len == 0)
2370 return -EINVAL;
2371
2372 if (ivvl[0]->vf >= INT_MAX)
2373 return -EINVAL;
2374 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2375 ivvl[0]->qos, ivvl[0]->vlan_proto);
2376 if (err < 0)
2377 return err;
2378 }
2379
2380 if (tb[IFLA_VF_TX_RATE]) {
2381 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2382 struct ifla_vf_info ivf;
2383
2384 if (ivt->vf >= INT_MAX)
2385 return -EINVAL;
2386 err = -EOPNOTSUPP;
2387 if (ops->ndo_get_vf_config)
2388 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2389 if (err < 0)
2390 return err;
2391
2392 err = -EOPNOTSUPP;
2393 if (ops->ndo_set_vf_rate)
2394 err = ops->ndo_set_vf_rate(dev, ivt->vf,
2395 ivf.min_tx_rate,
2396 ivt->rate);
2397 if (err < 0)
2398 return err;
2399 }
2400
2401 if (tb[IFLA_VF_RATE]) {
2402 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2403
2404 if (ivt->vf >= INT_MAX)
2405 return -EINVAL;
2406 err = -EOPNOTSUPP;
2407 if (ops->ndo_set_vf_rate)
2408 err = ops->ndo_set_vf_rate(dev, ivt->vf,
2409 ivt->min_tx_rate,
2410 ivt->max_tx_rate);
2411 if (err < 0)
2412 return err;
2413 }
2414
2415 if (tb[IFLA_VF_SPOOFCHK]) {
2416 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2417
2418 if (ivs->vf >= INT_MAX)
2419 return -EINVAL;
2420 err = -EOPNOTSUPP;
2421 if (ops->ndo_set_vf_spoofchk)
2422 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2423 ivs->setting);
2424 if (err < 0)
2425 return err;
2426 }
2427
2428 if (tb[IFLA_VF_LINK_STATE]) {
2429 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2430
2431 if (ivl->vf >= INT_MAX)
2432 return -EINVAL;
2433 err = -EOPNOTSUPP;
2434 if (ops->ndo_set_vf_link_state)
2435 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2436 ivl->link_state);
2437 if (err < 0)
2438 return err;
2439 }
2440
2441 if (tb[IFLA_VF_RSS_QUERY_EN]) {
2442 struct ifla_vf_rss_query_en *ivrssq_en;
2443
2444 err = -EOPNOTSUPP;
2445 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2446 if (ivrssq_en->vf >= INT_MAX)
2447 return -EINVAL;
2448 if (ops->ndo_set_vf_rss_query_en)
2449 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2450 ivrssq_en->setting);
2451 if (err < 0)
2452 return err;
2453 }
2454
2455 if (tb[IFLA_VF_TRUST]) {
2456 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2457
2458 if (ivt->vf >= INT_MAX)
2459 return -EINVAL;
2460 err = -EOPNOTSUPP;
2461 if (ops->ndo_set_vf_trust)
2462 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2463 if (err < 0)
2464 return err;
2465 }
2466
2467 if (tb[IFLA_VF_IB_NODE_GUID]) {
2468 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2469
2470 if (ivt->vf >= INT_MAX)
2471 return -EINVAL;
2472 if (!ops->ndo_set_vf_guid)
2473 return -EOPNOTSUPP;
2474 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2475 }
2476
2477 if (tb[IFLA_VF_IB_PORT_GUID]) {
2478 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2479
2480 if (ivt->vf >= INT_MAX)
2481 return -EINVAL;
2482 if (!ops->ndo_set_vf_guid)
2483 return -EOPNOTSUPP;
2484
2485 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2486 }
2487
2488 return err;
2489}
2490
2491static int do_set_master(struct net_device *dev, int ifindex,
2492 struct netlink_ext_ack *extack)
2493{
2494 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2495 const struct net_device_ops *ops;
2496 int err;
2497
2498 if (upper_dev) {
2499 if (upper_dev->ifindex == ifindex)
2500 return 0;
2501 ops = upper_dev->netdev_ops;
2502 if (ops->ndo_del_slave) {
2503 err = ops->ndo_del_slave(upper_dev, dev);
2504 if (err)
2505 return err;
2506 } else {
2507 return -EOPNOTSUPP;
2508 }
2509 }
2510
2511 if (ifindex) {
2512 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2513 if (!upper_dev)
2514 return -EINVAL;
2515 ops = upper_dev->netdev_ops;
2516 if (ops->ndo_add_slave) {
2517 err = ops->ndo_add_slave(upper_dev, dev, extack);
2518 if (err)
2519 return err;
2520 } else {
2521 return -EOPNOTSUPP;
2522 }
2523 }
2524 return 0;
2525}
2526
2527static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = {
2528 [IFLA_PROTO_DOWN_REASON_MASK] = { .type = NLA_U32 },
2529 [IFLA_PROTO_DOWN_REASON_VALUE] = { .type = NLA_U32 },
2530};
2531
2532static int do_set_proto_down(struct net_device *dev,
2533 struct nlattr *nl_proto_down,
2534 struct nlattr *nl_proto_down_reason,
2535 struct netlink_ext_ack *extack)
2536{
2537 struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1];
2538 const struct net_device_ops *ops = dev->netdev_ops;
2539 unsigned long mask = 0;
2540 u32 value;
2541 bool proto_down;
2542 int err;
2543
2544 if (!ops->ndo_change_proto_down) {
2545 NL_SET_ERR_MSG(extack, "Protodown not supported by device");
2546 return -EOPNOTSUPP;
2547 }
2548
2549 if (nl_proto_down_reason) {
2550 err = nla_parse_nested_deprecated(pdreason,
2551 IFLA_PROTO_DOWN_REASON_MAX,
2552 nl_proto_down_reason,
2553 ifla_proto_down_reason_policy,
2554 NULL);
2555 if (err < 0)
2556 return err;
2557
2558 if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) {
2559 NL_SET_ERR_MSG(extack, "Invalid protodown reason value");
2560 return -EINVAL;
2561 }
2562
2563 value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]);
2564
2565 if (pdreason[IFLA_PROTO_DOWN_REASON_MASK])
2566 mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]);
2567
2568 dev_change_proto_down_reason(dev, mask, value);
2569 }
2570
2571 if (nl_proto_down) {
2572 proto_down = nla_get_u8(nl_proto_down);
2573
2574 /* Dont turn off protodown if there are active reasons */
2575 if (!proto_down && dev->proto_down_reason) {
2576 NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons");
2577 return -EBUSY;
2578 }
2579 err = dev_change_proto_down(dev,
2580 proto_down);
2581 if (err)
2582 return err;
2583 }
2584
2585 return 0;
2586}
2587
2588#define DO_SETLINK_MODIFIED 0x01
2589/* notify flag means notify + modified. */
2590#define DO_SETLINK_NOTIFY 0x03
2591static int do_setlink(const struct sk_buff *skb,
2592 struct net_device *dev, struct ifinfomsg *ifm,
2593 struct netlink_ext_ack *extack,
2594 struct nlattr **tb, char *ifname, int status)
2595{
2596 const struct net_device_ops *ops = dev->netdev_ops;
2597 int err;
2598
2599 err = validate_linkmsg(dev, tb);
2600 if (err < 0)
2601 return err;
2602
2603 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2604 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev),
2605 tb, CAP_NET_ADMIN);
2606 if (IS_ERR(net)) {
2607 err = PTR_ERR(net);
2608 goto errout;
2609 }
2610
2611 err = dev_change_net_namespace(dev, net, ifname);
2612 put_net(net);
2613 if (err)
2614 goto errout;
2615 status |= DO_SETLINK_MODIFIED;
2616 }
2617
2618 if (tb[IFLA_MAP]) {
2619 struct rtnl_link_ifmap *u_map;
2620 struct ifmap k_map;
2621
2622 if (!ops->ndo_set_config) {
2623 err = -EOPNOTSUPP;
2624 goto errout;
2625 }
2626
2627 if (!netif_device_present(dev)) {
2628 err = -ENODEV;
2629 goto errout;
2630 }
2631
2632 u_map = nla_data(tb[IFLA_MAP]);
2633 k_map.mem_start = (unsigned long) u_map->mem_start;
2634 k_map.mem_end = (unsigned long) u_map->mem_end;
2635 k_map.base_addr = (unsigned short) u_map->base_addr;
2636 k_map.irq = (unsigned char) u_map->irq;
2637 k_map.dma = (unsigned char) u_map->dma;
2638 k_map.port = (unsigned char) u_map->port;
2639
2640 err = ops->ndo_set_config(dev, &k_map);
2641 if (err < 0)
2642 goto errout;
2643
2644 status |= DO_SETLINK_NOTIFY;
2645 }
2646
2647 if (tb[IFLA_ADDRESS]) {
2648 struct sockaddr *sa;
2649 int len;
2650
2651 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2652 sizeof(*sa));
2653 sa = kmalloc(len, GFP_KERNEL);
2654 if (!sa) {
2655 err = -ENOMEM;
2656 goto errout;
2657 }
2658 sa->sa_family = dev->type;
2659 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2660 dev->addr_len);
2661 err = dev_set_mac_address(dev, sa, extack);
2662 kfree(sa);
2663 if (err)
2664 goto errout;
2665 status |= DO_SETLINK_MODIFIED;
2666 }
2667
2668 if (tb[IFLA_MTU]) {
2669 err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2670 if (err < 0)
2671 goto errout;
2672 status |= DO_SETLINK_MODIFIED;
2673 }
2674
2675 if (tb[IFLA_GROUP]) {
2676 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2677 status |= DO_SETLINK_NOTIFY;
2678 }
2679
2680 /*
2681 * Interface selected by interface index but interface
2682 * name provided implies that a name change has been
2683 * requested.
2684 */
2685 if (ifm->ifi_index > 0 && ifname[0]) {
2686 err = dev_change_name(dev, ifname);
2687 if (err < 0)
2688 goto errout;
2689 status |= DO_SETLINK_MODIFIED;
2690 }
2691
2692 if (tb[IFLA_IFALIAS]) {
2693 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2694 nla_len(tb[IFLA_IFALIAS]));
2695 if (err < 0)
2696 goto errout;
2697 status |= DO_SETLINK_NOTIFY;
2698 }
2699
2700 if (tb[IFLA_BROADCAST]) {
2701 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2702 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2703 }
2704
2705 if (ifm->ifi_flags || ifm->ifi_change) {
2706 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2707 extack);
2708 if (err < 0)
2709 goto errout;
2710 }
2711
2712 if (tb[IFLA_MASTER]) {
2713 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2714 if (err)
2715 goto errout;
2716 status |= DO_SETLINK_MODIFIED;
2717 }
2718
2719 if (tb[IFLA_CARRIER]) {
2720 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2721 if (err)
2722 goto errout;
2723 status |= DO_SETLINK_MODIFIED;
2724 }
2725
2726 if (tb[IFLA_TXQLEN]) {
2727 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2728
2729 err = dev_change_tx_queue_len(dev, value);
2730 if (err)
2731 goto errout;
2732 status |= DO_SETLINK_MODIFIED;
2733 }
2734
2735 if (tb[IFLA_GSO_MAX_SIZE]) {
2736 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2737
2738 if (max_size > GSO_MAX_SIZE) {
2739 err = -EINVAL;
2740 goto errout;
2741 }
2742
2743 if (dev->gso_max_size ^ max_size) {
2744 netif_set_gso_max_size(dev, max_size);
2745 status |= DO_SETLINK_MODIFIED;
2746 }
2747 }
2748
2749 if (tb[IFLA_GSO_MAX_SEGS]) {
2750 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2751
2752 if (max_segs > GSO_MAX_SEGS) {
2753 err = -EINVAL;
2754 goto errout;
2755 }
2756
2757 if (dev->gso_max_segs ^ max_segs) {
2758 dev->gso_max_segs = max_segs;
2759 status |= DO_SETLINK_MODIFIED;
2760 }
2761 }
2762
2763 if (tb[IFLA_OPERSTATE])
2764 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2765
2766 if (tb[IFLA_LINKMODE]) {
2767 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2768
2769 write_lock_bh(&dev_base_lock);
2770 if (dev->link_mode ^ value)
2771 status |= DO_SETLINK_NOTIFY;
2772 dev->link_mode = value;
2773 write_unlock_bh(&dev_base_lock);
2774 }
2775
2776 if (tb[IFLA_VFINFO_LIST]) {
2777 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2778 struct nlattr *attr;
2779 int rem;
2780
2781 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2782 if (nla_type(attr) != IFLA_VF_INFO ||
2783 nla_len(attr) < NLA_HDRLEN) {
2784 err = -EINVAL;
2785 goto errout;
2786 }
2787 err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
2788 attr,
2789 ifla_vf_policy,
2790 NULL);
2791 if (err < 0)
2792 goto errout;
2793 err = do_setvfinfo(dev, vfinfo);
2794 if (err < 0)
2795 goto errout;
2796 status |= DO_SETLINK_NOTIFY;
2797 }
2798 }
2799 err = 0;
2800
2801 if (tb[IFLA_VF_PORTS]) {
2802 struct nlattr *port[IFLA_PORT_MAX+1];
2803 struct nlattr *attr;
2804 int vf;
2805 int rem;
2806
2807 err = -EOPNOTSUPP;
2808 if (!ops->ndo_set_vf_port)
2809 goto errout;
2810
2811 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2812 if (nla_type(attr) != IFLA_VF_PORT ||
2813 nla_len(attr) < NLA_HDRLEN) {
2814 err = -EINVAL;
2815 goto errout;
2816 }
2817 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2818 attr,
2819 ifla_port_policy,
2820 NULL);
2821 if (err < 0)
2822 goto errout;
2823 if (!port[IFLA_PORT_VF]) {
2824 err = -EOPNOTSUPP;
2825 goto errout;
2826 }
2827 vf = nla_get_u32(port[IFLA_PORT_VF]);
2828 err = ops->ndo_set_vf_port(dev, vf, port);
2829 if (err < 0)
2830 goto errout;
2831 status |= DO_SETLINK_NOTIFY;
2832 }
2833 }
2834 err = 0;
2835
2836 if (tb[IFLA_PORT_SELF]) {
2837 struct nlattr *port[IFLA_PORT_MAX+1];
2838
2839 err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2840 tb[IFLA_PORT_SELF],
2841 ifla_port_policy, NULL);
2842 if (err < 0)
2843 goto errout;
2844
2845 err = -EOPNOTSUPP;
2846 if (ops->ndo_set_vf_port)
2847 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2848 if (err < 0)
2849 goto errout;
2850 status |= DO_SETLINK_NOTIFY;
2851 }
2852
2853 if (tb[IFLA_AF_SPEC]) {
2854 struct nlattr *af;
2855 int rem;
2856
2857 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2858 const struct rtnl_af_ops *af_ops;
2859
2860 rcu_read_lock();
2861
2862 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2863
2864 err = af_ops->set_link_af(dev, af);
2865 if (err < 0) {
2866 rcu_read_unlock();
2867 goto errout;
2868 }
2869
2870 rcu_read_unlock();
2871 status |= DO_SETLINK_NOTIFY;
2872 }
2873 }
2874 err = 0;
2875
2876 if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) {
2877 err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN],
2878 tb[IFLA_PROTO_DOWN_REASON], extack);
2879 if (err)
2880 goto errout;
2881 status |= DO_SETLINK_NOTIFY;
2882 }
2883
2884 if (tb[IFLA_XDP]) {
2885 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2886 u32 xdp_flags = 0;
2887
2888 err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
2889 tb[IFLA_XDP],
2890 ifla_xdp_policy, NULL);
2891 if (err < 0)
2892 goto errout;
2893
2894 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2895 err = -EINVAL;
2896 goto errout;
2897 }
2898
2899 if (xdp[IFLA_XDP_FLAGS]) {
2900 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2901 if (xdp_flags & ~XDP_FLAGS_MASK) {
2902 err = -EINVAL;
2903 goto errout;
2904 }
2905 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2906 err = -EINVAL;
2907 goto errout;
2908 }
2909 }
2910
2911 if (xdp[IFLA_XDP_FD]) {
2912 int expected_fd = -1;
2913
2914 if (xdp_flags & XDP_FLAGS_REPLACE) {
2915 if (!xdp[IFLA_XDP_EXPECTED_FD]) {
2916 err = -EINVAL;
2917 goto errout;
2918 }
2919 expected_fd =
2920 nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]);
2921 }
2922
2923 err = dev_change_xdp_fd(dev, extack,
2924 nla_get_s32(xdp[IFLA_XDP_FD]),
2925 expected_fd,
2926 xdp_flags);
2927 if (err)
2928 goto errout;
2929 status |= DO_SETLINK_NOTIFY;
2930 }
2931 }
2932
2933errout:
2934 if (status & DO_SETLINK_MODIFIED) {
2935 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2936 netdev_state_change(dev);
2937
2938 if (err < 0)
2939 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",
2940 dev->name);
2941 }
2942
2943 return err;
2944}
2945
2946static struct net_device *rtnl_dev_get(struct net *net,
2947 struct nlattr *ifname_attr,
2948 struct nlattr *altifname_attr,
2949 char *ifname)
2950{
2951 char buffer[ALTIFNAMSIZ];
2952
2953 if (!ifname) {
2954 ifname = buffer;
2955 if (ifname_attr)
2956 nla_strlcpy(ifname, ifname_attr, IFNAMSIZ);
2957 else if (altifname_attr)
2958 nla_strlcpy(ifname, altifname_attr, ALTIFNAMSIZ);
2959 else
2960 return NULL;
2961 }
2962
2963 return __dev_get_by_name(net, ifname);
2964}
2965
2966static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2967 struct netlink_ext_ack *extack)
2968{
2969 struct net *net = sock_net(skb->sk);
2970 struct ifinfomsg *ifm;
2971 struct net_device *dev;
2972 int err;
2973 struct nlattr *tb[IFLA_MAX+1];
2974 char ifname[IFNAMSIZ];
2975
2976 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2977 ifla_policy, extack);
2978 if (err < 0)
2979 goto errout;
2980
2981 err = rtnl_ensure_unique_netns(tb, extack, false);
2982 if (err < 0)
2983 goto errout;
2984
2985 if (tb[IFLA_IFNAME])
2986 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2987 else
2988 ifname[0] = '\0';
2989
2990 err = -EINVAL;
2991 ifm = nlmsg_data(nlh);
2992 if (ifm->ifi_index > 0)
2993 dev = __dev_get_by_index(net, ifm->ifi_index);
2994 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
2995 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
2996 else
2997 goto errout;
2998
2999 if (dev == NULL) {
3000 err = -ENODEV;
3001 goto errout;
3002 }
3003
3004 err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
3005errout:
3006 return err;
3007}
3008
3009static int rtnl_group_dellink(const struct net *net, int group)
3010{
3011 struct net_device *dev, *aux;
3012 LIST_HEAD(list_kill);
3013 bool found = false;
3014
3015 if (!group)
3016 return -EPERM;
3017
3018 for_each_netdev(net, dev) {
3019 if (dev->group == group) {
3020 const struct rtnl_link_ops *ops;
3021
3022 found = true;
3023 ops = dev->rtnl_link_ops;
3024 if (!ops || !ops->dellink)
3025 return -EOPNOTSUPP;
3026 }
3027 }
3028
3029 if (!found)
3030 return -ENODEV;
3031
3032 for_each_netdev_safe(net, dev, aux) {
3033 if (dev->group == group) {
3034 const struct rtnl_link_ops *ops;
3035
3036 ops = dev->rtnl_link_ops;
3037 ops->dellink(dev, &list_kill);
3038 }
3039 }
3040 unregister_netdevice_many(&list_kill);
3041
3042 return 0;
3043}
3044
3045int rtnl_delete_link(struct net_device *dev)
3046{
3047 const struct rtnl_link_ops *ops;
3048 LIST_HEAD(list_kill);
3049
3050 ops = dev->rtnl_link_ops;
3051 if (!ops || !ops->dellink)
3052 return -EOPNOTSUPP;
3053
3054 ops->dellink(dev, &list_kill);
3055 unregister_netdevice_many(&list_kill);
3056
3057 return 0;
3058}
3059EXPORT_SYMBOL_GPL(rtnl_delete_link);
3060
3061static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
3062 struct netlink_ext_ack *extack)
3063{
3064 struct net *net = sock_net(skb->sk);
3065 struct net *tgt_net = net;
3066 struct net_device *dev = NULL;
3067 struct ifinfomsg *ifm;
3068 struct nlattr *tb[IFLA_MAX+1];
3069 int err;
3070 int netnsid = -1;
3071
3072 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3073 ifla_policy, extack);
3074 if (err < 0)
3075 return err;
3076
3077 err = rtnl_ensure_unique_netns(tb, extack, true);
3078 if (err < 0)
3079 return err;
3080
3081 if (tb[IFLA_TARGET_NETNSID]) {
3082 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3083 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3084 if (IS_ERR(tgt_net))
3085 return PTR_ERR(tgt_net);
3086 }
3087
3088 err = -EINVAL;
3089 ifm = nlmsg_data(nlh);
3090 if (ifm->ifi_index > 0)
3091 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3092 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3093 dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
3094 tb[IFLA_ALT_IFNAME], NULL);
3095 else if (tb[IFLA_GROUP])
3096 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
3097 else
3098 goto out;
3099
3100 if (!dev) {
3101 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
3102 err = -ENODEV;
3103
3104 goto out;
3105 }
3106
3107 err = rtnl_delete_link(dev);
3108
3109out:
3110 if (netnsid >= 0)
3111 put_net(tgt_net);
3112
3113 return err;
3114}
3115
3116int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
3117{
3118 unsigned int old_flags;
3119 int err;
3120
3121 old_flags = dev->flags;
3122 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
3123 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
3124 NULL);
3125 if (err < 0)
3126 return err;
3127 }
3128
3129 if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
3130 __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
3131 } else {
3132 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
3133 __dev_notify_flags(dev, old_flags, ~0U);
3134 }
3135 return 0;
3136}
3137EXPORT_SYMBOL(rtnl_configure_link);
3138
3139struct net_device *rtnl_create_link(struct net *net, const char *ifname,
3140 unsigned char name_assign_type,
3141 const struct rtnl_link_ops *ops,
3142 struct nlattr *tb[],
3143 struct netlink_ext_ack *extack)
3144{
3145 struct net_device *dev;
3146 unsigned int num_tx_queues = 1;
3147 unsigned int num_rx_queues = 1;
3148
3149 if (tb[IFLA_NUM_TX_QUEUES])
3150 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
3151 else if (ops->get_num_tx_queues)
3152 num_tx_queues = ops->get_num_tx_queues();
3153
3154 if (tb[IFLA_NUM_RX_QUEUES])
3155 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
3156 else if (ops->get_num_rx_queues)
3157 num_rx_queues = ops->get_num_rx_queues();
3158
3159 if (num_tx_queues < 1 || num_tx_queues > 4096) {
3160 NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
3161 return ERR_PTR(-EINVAL);
3162 }
3163
3164 if (num_rx_queues < 1 || num_rx_queues > 4096) {
3165 NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
3166 return ERR_PTR(-EINVAL);
3167 }
3168
3169 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
3170 ops->setup, num_tx_queues, num_rx_queues);
3171 if (!dev)
3172 return ERR_PTR(-ENOMEM);
3173
3174 dev_net_set(dev, net);
3175 dev->rtnl_link_ops = ops;
3176 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
3177
3178 if (tb[IFLA_MTU]) {
3179 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3180 int err;
3181
3182 err = dev_validate_mtu(dev, mtu, extack);
3183 if (err) {
3184 free_netdev(dev);
3185 return ERR_PTR(err);
3186 }
3187 dev->mtu = mtu;
3188 }
3189 if (tb[IFLA_ADDRESS]) {
3190 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
3191 nla_len(tb[IFLA_ADDRESS]));
3192 dev->addr_assign_type = NET_ADDR_SET;
3193 }
3194 if (tb[IFLA_BROADCAST])
3195 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
3196 nla_len(tb[IFLA_BROADCAST]));
3197 if (tb[IFLA_TXQLEN])
3198 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
3199 if (tb[IFLA_OPERSTATE])
3200 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
3201 if (tb[IFLA_LINKMODE])
3202 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
3203 if (tb[IFLA_GROUP])
3204 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
3205 if (tb[IFLA_GSO_MAX_SIZE])
3206 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
3207 if (tb[IFLA_GSO_MAX_SEGS])
3208 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
3209
3210 return dev;
3211}
3212EXPORT_SYMBOL(rtnl_create_link);
3213
3214static int rtnl_group_changelink(const struct sk_buff *skb,
3215 struct net *net, int group,
3216 struct ifinfomsg *ifm,
3217 struct netlink_ext_ack *extack,
3218 struct nlattr **tb)
3219{
3220 struct net_device *dev, *aux;
3221 int err;
3222
3223 for_each_netdev_safe(net, dev, aux) {
3224 if (dev->group == group) {
3225 err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
3226 if (err < 0)
3227 return err;
3228 }
3229 }
3230
3231 return 0;
3232}
3233
3234static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3235 struct nlattr **attr, struct netlink_ext_ack *extack)
3236{
3237 struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3238 unsigned char name_assign_type = NET_NAME_USER;
3239 struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
3240 const struct rtnl_link_ops *m_ops = NULL;
3241 struct net_device *master_dev = NULL;
3242 struct net *net = sock_net(skb->sk);
3243 const struct rtnl_link_ops *ops;
3244 struct nlattr *tb[IFLA_MAX + 1];
3245 struct net *dest_net, *link_net;
3246 struct nlattr **slave_data;
3247 char kind[MODULE_NAME_LEN];
3248 struct net_device *dev;
3249 struct ifinfomsg *ifm;
3250 char ifname[IFNAMSIZ];
3251 struct nlattr **data;
3252 int err;
3253
3254#ifdef CONFIG_MODULES
3255replay:
3256#endif
3257 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3258 ifla_policy, extack);
3259 if (err < 0)
3260 return err;
3261
3262 err = rtnl_ensure_unique_netns(tb, extack, false);
3263 if (err < 0)
3264 return err;
3265
3266 if (tb[IFLA_IFNAME])
3267 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3268 else
3269 ifname[0] = '\0';
3270
3271 ifm = nlmsg_data(nlh);
3272 if (ifm->ifi_index > 0)
3273 dev = __dev_get_by_index(net, ifm->ifi_index);
3274 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3275 dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
3276 else
3277 dev = NULL;
3278
3279 if (dev) {
3280 master_dev = netdev_master_upper_dev_get(dev);
3281 if (master_dev)
3282 m_ops = master_dev->rtnl_link_ops;
3283 }
3284
3285 err = validate_linkmsg(dev, tb);
3286 if (err < 0)
3287 return err;
3288
3289 if (tb[IFLA_LINKINFO]) {
3290 err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3291 tb[IFLA_LINKINFO],
3292 ifla_info_policy, NULL);
3293 if (err < 0)
3294 return err;
3295 } else
3296 memset(linkinfo, 0, sizeof(linkinfo));
3297
3298 if (linkinfo[IFLA_INFO_KIND]) {
3299 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3300 ops = rtnl_link_ops_get(kind);
3301 } else {
3302 kind[0] = '\0';
3303 ops = NULL;
3304 }
3305
3306 data = NULL;
3307 if (ops) {
3308 if (ops->maxtype > RTNL_MAX_TYPE)
3309 return -EINVAL;
3310
3311 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3312 err = nla_parse_nested_deprecated(attr, ops->maxtype,
3313 linkinfo[IFLA_INFO_DATA],
3314 ops->policy, extack);
3315 if (err < 0)
3316 return err;
3317 data = attr;
3318 }
3319 if (ops->validate) {
3320 err = ops->validate(tb, data, extack);
3321 if (err < 0)
3322 return err;
3323 }
3324 }
3325
3326 slave_data = NULL;
3327 if (m_ops) {
3328 if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3329 return -EINVAL;
3330
3331 if (m_ops->slave_maxtype &&
3332 linkinfo[IFLA_INFO_SLAVE_DATA]) {
3333 err = nla_parse_nested_deprecated(slave_attr,
3334 m_ops->slave_maxtype,
3335 linkinfo[IFLA_INFO_SLAVE_DATA],
3336 m_ops->slave_policy,
3337 extack);
3338 if (err < 0)
3339 return err;
3340 slave_data = slave_attr;
3341 }
3342 }
3343
3344 if (dev) {
3345 int status = 0;
3346
3347 if (nlh->nlmsg_flags & NLM_F_EXCL)
3348 return -EEXIST;
3349 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3350 return -EOPNOTSUPP;
3351
3352 if (linkinfo[IFLA_INFO_DATA]) {
3353 if (!ops || ops != dev->rtnl_link_ops ||
3354 !ops->changelink)
3355 return -EOPNOTSUPP;
3356
3357 err = ops->changelink(dev, tb, data, extack);
3358 if (err < 0)
3359 return err;
3360 status |= DO_SETLINK_NOTIFY;
3361 }
3362
3363 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3364 if (!m_ops || !m_ops->slave_changelink)
3365 return -EOPNOTSUPP;
3366
3367 err = m_ops->slave_changelink(master_dev, dev, tb,
3368 slave_data, extack);
3369 if (err < 0)
3370 return err;
3371 status |= DO_SETLINK_NOTIFY;
3372 }
3373
3374 return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
3375 }
3376
3377 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3378 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3379 return rtnl_group_changelink(skb, net,
3380 nla_get_u32(tb[IFLA_GROUP]),
3381 ifm, extack, tb);
3382 return -ENODEV;
3383 }
3384
3385 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3386 return -EOPNOTSUPP;
3387
3388 if (!ops) {
3389#ifdef CONFIG_MODULES
3390 if (kind[0]) {
3391 __rtnl_unlock();
3392 request_module("rtnl-link-%s", kind);
3393 rtnl_lock();
3394 ops = rtnl_link_ops_get(kind);
3395 if (ops)
3396 goto replay;
3397 }
3398#endif
3399 NL_SET_ERR_MSG(extack, "Unknown device type");
3400 return -EOPNOTSUPP;
3401 }
3402
3403 if (!ops->setup)
3404 return -EOPNOTSUPP;
3405
3406 if (!ifname[0]) {
3407 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3408 name_assign_type = NET_NAME_ENUM;
3409 }
3410
3411 dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3412 if (IS_ERR(dest_net))
3413 return PTR_ERR(dest_net);
3414
3415 if (tb[IFLA_LINK_NETNSID]) {
3416 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3417
3418 link_net = get_net_ns_by_id(dest_net, id);
3419 if (!link_net) {
3420 NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3421 err = -EINVAL;
3422 goto out;
3423 }
3424 err = -EPERM;
3425 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3426 goto out;
3427 } else {
3428 link_net = NULL;
3429 }
3430
3431 dev = rtnl_create_link(link_net ? : dest_net, ifname,
3432 name_assign_type, ops, tb, extack);
3433 if (IS_ERR(dev)) {
3434 err = PTR_ERR(dev);
3435 goto out;
3436 }
3437
3438 dev->ifindex = ifm->ifi_index;
3439
3440 if (ops->newlink) {
3441 err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3442 /* Drivers should call free_netdev() in ->destructor
3443 * and unregister it on failure after registration
3444 * so that device could be finally freed in rtnl_unlock.
3445 */
3446 if (err < 0) {
3447 /* If device is not registered at all, free it now */
3448 if (dev->reg_state == NETREG_UNINITIALIZED ||
3449 dev->reg_state == NETREG_UNREGISTERED)
3450 free_netdev(dev);
3451 goto out;
3452 }
3453 } else {
3454 err = register_netdevice(dev);
3455 if (err < 0) {
3456 free_netdev(dev);
3457 goto out;
3458 }
3459 }
3460 err = rtnl_configure_link(dev, ifm);
3461 if (err < 0)
3462 goto out_unregister;
3463 if (link_net) {
3464 err = dev_change_net_namespace(dev, dest_net, ifname);
3465 if (err < 0)
3466 goto out_unregister;
3467 }
3468 if (tb[IFLA_MASTER]) {
3469 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3470 if (err)
3471 goto out_unregister;
3472 }
3473out:
3474 if (link_net)
3475 put_net(link_net);
3476 put_net(dest_net);
3477 return err;
3478out_unregister:
3479 if (ops->newlink) {
3480 LIST_HEAD(list_kill);
3481
3482 ops->dellink(dev, &list_kill);
3483 unregister_netdevice_many(&list_kill);
3484 } else {
3485 unregister_netdevice(dev);
3486 }
3487 goto out;
3488}
3489
3490static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3491 struct netlink_ext_ack *extack)
3492{
3493 struct nlattr **attr;
3494 int ret;
3495
3496 attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
3497 if (!attr)
3498 return -ENOMEM;
3499
3500 ret = __rtnl_newlink(skb, nlh, attr, extack);
3501 kfree(attr);
3502 return ret;
3503}
3504
3505static int rtnl_valid_getlink_req(struct sk_buff *skb,
3506 const struct nlmsghdr *nlh,
3507 struct nlattr **tb,
3508 struct netlink_ext_ack *extack)
3509{
3510 struct ifinfomsg *ifm;
3511 int i, err;
3512
3513 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3514 NL_SET_ERR_MSG(extack, "Invalid header for get link");
3515 return -EINVAL;
3516 }
3517
3518 if (!netlink_strict_get_check(skb))
3519 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3520 ifla_policy, extack);
3521
3522 ifm = nlmsg_data(nlh);
3523 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3524 ifm->ifi_change) {
3525 NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3526 return -EINVAL;
3527 }
3528
3529 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3530 ifla_policy, extack);
3531 if (err)
3532 return err;
3533
3534 for (i = 0; i <= IFLA_MAX; i++) {
3535 if (!tb[i])
3536 continue;
3537
3538 switch (i) {
3539 case IFLA_IFNAME:
3540 case IFLA_ALT_IFNAME:
3541 case IFLA_EXT_MASK:
3542 case IFLA_TARGET_NETNSID:
3543 break;
3544 default:
3545 NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3546 return -EINVAL;
3547 }
3548 }
3549
3550 return 0;
3551}
3552
3553static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3554 struct netlink_ext_ack *extack)
3555{
3556 struct net *net = sock_net(skb->sk);
3557 struct net *tgt_net = net;
3558 struct ifinfomsg *ifm;
3559 struct nlattr *tb[IFLA_MAX+1];
3560 struct net_device *dev = NULL;
3561 struct sk_buff *nskb;
3562 int netnsid = -1;
3563 int err;
3564 u32 ext_filter_mask = 0;
3565
3566 err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3567 if (err < 0)
3568 return err;
3569
3570 err = rtnl_ensure_unique_netns(tb, extack, true);
3571 if (err < 0)
3572 return err;
3573
3574 if (tb[IFLA_TARGET_NETNSID]) {
3575 netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3576 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3577 if (IS_ERR(tgt_net))
3578 return PTR_ERR(tgt_net);
3579 }
3580
3581 if (tb[IFLA_EXT_MASK])
3582 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3583
3584 err = -EINVAL;
3585 ifm = nlmsg_data(nlh);
3586 if (ifm->ifi_index > 0)
3587 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3588 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3589 dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME],
3590 tb[IFLA_ALT_IFNAME], NULL);
3591 else
3592 goto out;
3593
3594 err = -ENODEV;
3595 if (dev == NULL)
3596 goto out;
3597
3598 err = -ENOBUFS;
3599 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3600 if (nskb == NULL)
3601 goto out;
3602
3603 err = rtnl_fill_ifinfo(nskb, dev, net,
3604 RTM_NEWLINK, NETLINK_CB(skb).portid,
3605 nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3606 0, NULL, 0, netnsid, GFP_KERNEL);
3607 if (err < 0) {
3608 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3609 WARN_ON(err == -EMSGSIZE);
3610 kfree_skb(nskb);
3611 } else
3612 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3613out:
3614 if (netnsid >= 0)
3615 put_net(tgt_net);
3616
3617 return err;
3618}
3619
3620static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
3621 bool *changed, struct netlink_ext_ack *extack)
3622{
3623 char *alt_ifname;
3624 int err;
3625
3626 err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
3627 if (err)
3628 return err;
3629
3630 alt_ifname = nla_strdup(attr, GFP_KERNEL);
3631 if (!alt_ifname)
3632 return -ENOMEM;
3633
3634 if (cmd == RTM_NEWLINKPROP) {
3635 err = netdev_name_node_alt_create(dev, alt_ifname);
3636 if (!err)
3637 alt_ifname = NULL;
3638 } else if (cmd == RTM_DELLINKPROP) {
3639 err = netdev_name_node_alt_destroy(dev, alt_ifname);
3640 } else {
3641 WARN_ON_ONCE(1);
3642 err = -EINVAL;
3643 }
3644
3645 kfree(alt_ifname);
3646 if (!err)
3647 *changed = true;
3648 return err;
3649}
3650
3651static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
3652 struct netlink_ext_ack *extack)
3653{
3654 struct net *net = sock_net(skb->sk);
3655 struct nlattr *tb[IFLA_MAX + 1];
3656 struct net_device *dev;
3657 struct ifinfomsg *ifm;
3658 bool changed = false;
3659 struct nlattr *attr;
3660 int err, rem;
3661
3662 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3663 if (err)
3664 return err;
3665
3666 err = rtnl_ensure_unique_netns(tb, extack, true);
3667 if (err)
3668 return err;
3669
3670 ifm = nlmsg_data(nlh);
3671 if (ifm->ifi_index > 0)
3672 dev = __dev_get_by_index(net, ifm->ifi_index);
3673 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3674 dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
3675 tb[IFLA_ALT_IFNAME], NULL);
3676 else
3677 return -EINVAL;
3678
3679 if (!dev)
3680 return -ENODEV;
3681
3682 if (!tb[IFLA_PROP_LIST])
3683 return 0;
3684
3685 nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
3686 switch (nla_type(attr)) {
3687 case IFLA_ALT_IFNAME:
3688 err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
3689 if (err)
3690 return err;
3691 break;
3692 }
3693 }
3694
3695 if (changed)
3696 netdev_state_change(dev);
3697 return 0;
3698}
3699
3700static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3701 struct netlink_ext_ack *extack)
3702{
3703 return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
3704}
3705
3706static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3707 struct netlink_ext_ack *extack)
3708{
3709 return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
3710}
3711
3712static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3713{
3714 struct net *net = sock_net(skb->sk);
3715 struct net_device *dev;
3716 struct nlattr *tb[IFLA_MAX+1];
3717 u32 ext_filter_mask = 0;
3718 u16 min_ifinfo_dump_size = 0;
3719 int hdrlen;
3720
3721 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3722 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3723 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3724
3725 if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3726 if (tb[IFLA_EXT_MASK])
3727 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3728 }
3729
3730 if (!ext_filter_mask)
3731 return NLMSG_GOODSIZE;
3732 /*
3733 * traverse the list of net devices and compute the minimum
3734 * buffer size based upon the filter mask.
3735 */
3736 rcu_read_lock();
3737 for_each_netdev_rcu(net, dev) {
3738 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
3739 if_nlmsg_size(dev,
3740 ext_filter_mask));
3741 }
3742 rcu_read_unlock();
3743
3744 return nlmsg_total_size(min_ifinfo_dump_size);
3745}
3746
3747static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3748{
3749 int idx;
3750 int s_idx = cb->family;
3751 int type = cb->nlh->nlmsg_type - RTM_BASE;
3752 int ret = 0;
3753
3754 if (s_idx == 0)
3755 s_idx = 1;
3756
3757 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3758 struct rtnl_link **tab;
3759 struct rtnl_link *link;
3760 rtnl_dumpit_func dumpit;
3761
3762 if (idx < s_idx || idx == PF_PACKET)
3763 continue;
3764
3765 if (type < 0 || type >= RTM_NR_MSGTYPES)
3766 continue;
3767
3768 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3769 if (!tab)
3770 continue;
3771
3772 link = tab[type];
3773 if (!link)
3774 continue;
3775
3776 dumpit = link->dumpit;
3777 if (!dumpit)
3778 continue;
3779
3780 if (idx > s_idx) {
3781 memset(&cb->args[0], 0, sizeof(cb->args));
3782 cb->prev_seq = 0;
3783 cb->seq = 0;
3784 }
3785 ret = dumpit(skb, cb);
3786 if (ret)
3787 break;
3788 }
3789 cb->family = idx;
3790
3791 return skb->len ? : ret;
3792}
3793
3794struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3795 unsigned int change,
3796 u32 event, gfp_t flags, int *new_nsid,
3797 int new_ifindex)
3798{
3799 struct net *net = dev_net(dev);
3800 struct sk_buff *skb;
3801 int err = -ENOBUFS;
3802 size_t if_info_size;
3803
3804 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3805 if (skb == NULL)
3806 goto errout;
3807
3808 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3809 type, 0, 0, change, 0, 0, event,
3810 new_nsid, new_ifindex, -1, flags);
3811 if (err < 0) {
3812 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3813 WARN_ON(err == -EMSGSIZE);
3814 kfree_skb(skb);
3815 goto errout;
3816 }
3817 return skb;
3818errout:
3819 if (err < 0)
3820 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3821 return NULL;
3822}
3823
3824void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3825{
3826 struct net *net = dev_net(dev);
3827
3828 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3829}
3830
3831static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3832 unsigned int change, u32 event,
3833 gfp_t flags, int *new_nsid, int new_ifindex)
3834{
3835 struct sk_buff *skb;
3836
3837 if (dev->reg_state != NETREG_REGISTERED)
3838 return;
3839
3840 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3841 new_ifindex);
3842 if (skb)
3843 rtmsg_ifinfo_send(skb, dev, flags);
3844}
3845
3846void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3847 gfp_t flags)
3848{
3849 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3850 NULL, 0);
3851}
3852
3853void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3854 gfp_t flags, int *new_nsid, int new_ifindex)
3855{
3856 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3857 new_nsid, new_ifindex);
3858}
3859
3860static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3861 struct net_device *dev,
3862 u8 *addr, u16 vid, u32 pid, u32 seq,
3863 int type, unsigned int flags,
3864 int nlflags, u16 ndm_state)
3865{
3866 struct nlmsghdr *nlh;
3867 struct ndmsg *ndm;
3868
3869 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3870 if (!nlh)
3871 return -EMSGSIZE;
3872
3873 ndm = nlmsg_data(nlh);
3874 ndm->ndm_family = AF_BRIDGE;
3875 ndm->ndm_pad1 = 0;
3876 ndm->ndm_pad2 = 0;
3877 ndm->ndm_flags = flags;
3878 ndm->ndm_type = 0;
3879 ndm->ndm_ifindex = dev->ifindex;
3880 ndm->ndm_state = ndm_state;
3881
3882 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3883 goto nla_put_failure;
3884 if (vid)
3885 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3886 goto nla_put_failure;
3887
3888 nlmsg_end(skb, nlh);
3889 return 0;
3890
3891nla_put_failure:
3892 nlmsg_cancel(skb, nlh);
3893 return -EMSGSIZE;
3894}
3895
3896static inline size_t rtnl_fdb_nlmsg_size(void)
3897{
3898 return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3899 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */
3900 nla_total_size(sizeof(u16)) + /* NDA_VLAN */
3901 0;
3902}
3903
3904static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3905 u16 ndm_state)
3906{
3907 struct net *net = dev_net(dev);
3908 struct sk_buff *skb;
3909 int err = -ENOBUFS;
3910
3911 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3912 if (!skb)
3913 goto errout;
3914
3915 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3916 0, 0, type, NTF_SELF, 0, ndm_state);
3917 if (err < 0) {
3918 kfree_skb(skb);
3919 goto errout;
3920 }
3921
3922 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3923 return;
3924errout:
3925 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3926}
3927
3928/*
3929 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3930 */
3931int ndo_dflt_fdb_add(struct ndmsg *ndm,
3932 struct nlattr *tb[],
3933 struct net_device *dev,
3934 const unsigned char *addr, u16 vid,
3935 u16 flags)
3936{
3937 int err = -EINVAL;
3938
3939 /* If aging addresses are supported device will need to
3940 * implement its own handler for this.
3941 */
3942 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3943 pr_info("%s: FDB only supports static addresses\n", dev->name);
3944 return err;
3945 }
3946
3947 if (vid) {
3948 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3949 return err;
3950 }
3951
3952 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3953 err = dev_uc_add_excl(dev, addr);
3954 else if (is_multicast_ether_addr(addr))
3955 err = dev_mc_add_excl(dev, addr);
3956
3957 /* Only return duplicate errors if NLM_F_EXCL is set */
3958 if (err == -EEXIST && !(flags & NLM_F_EXCL))
3959 err = 0;
3960
3961 return err;
3962}
3963EXPORT_SYMBOL(ndo_dflt_fdb_add);
3964
3965static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3966 struct netlink_ext_ack *extack)
3967{
3968 u16 vid = 0;
3969
3970 if (vlan_attr) {
3971 if (nla_len(vlan_attr) != sizeof(u16)) {
3972 NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3973 return -EINVAL;
3974 }
3975
3976 vid = nla_get_u16(vlan_attr);
3977
3978 if (!vid || vid >= VLAN_VID_MASK) {
3979 NL_SET_ERR_MSG(extack, "invalid vlan id");
3980 return -EINVAL;
3981 }
3982 }
3983 *p_vid = vid;
3984 return 0;
3985}
3986
3987static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3988 struct netlink_ext_ack *extack)
3989{
3990 struct net *net = sock_net(skb->sk);
3991 struct ndmsg *ndm;
3992 struct nlattr *tb[NDA_MAX+1];
3993 struct net_device *dev;
3994 u8 *addr;
3995 u16 vid;
3996 int err;
3997
3998 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
3999 extack);
4000 if (err < 0)
4001 return err;
4002
4003 ndm = nlmsg_data(nlh);
4004 if (ndm->ndm_ifindex == 0) {
4005 NL_SET_ERR_MSG(extack, "invalid ifindex");
4006 return -EINVAL;
4007 }
4008
4009 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4010 if (dev == NULL) {
4011 NL_SET_ERR_MSG(extack, "unknown ifindex");
4012 return -ENODEV;
4013 }
4014
4015 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4016 NL_SET_ERR_MSG(extack, "invalid address");
4017 return -EINVAL;
4018 }
4019
4020 if (dev->type != ARPHRD_ETHER) {
4021 NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
4022 return -EINVAL;
4023 }
4024
4025 addr = nla_data(tb[NDA_LLADDR]);
4026
4027 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4028 if (err)
4029 return err;
4030
4031 err = -EOPNOTSUPP;
4032
4033 /* Support fdb on master device the net/bridge default case */
4034 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4035 netif_is_bridge_port(dev)) {
4036 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4037 const struct net_device_ops *ops = br_dev->netdev_ops;
4038
4039 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
4040 nlh->nlmsg_flags, extack);
4041 if (err)
4042 goto out;
4043 else
4044 ndm->ndm_flags &= ~NTF_MASTER;
4045 }
4046
4047 /* Embedded bridge, macvlan, and any other device support */
4048 if ((ndm->ndm_flags & NTF_SELF)) {
4049 if (dev->netdev_ops->ndo_fdb_add)
4050 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
4051 vid,
4052 nlh->nlmsg_flags,
4053 extack);
4054 else
4055 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
4056 nlh->nlmsg_flags);
4057
4058 if (!err) {
4059 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
4060 ndm->ndm_state);
4061 ndm->ndm_flags &= ~NTF_SELF;
4062 }
4063 }
4064out:
4065 return err;
4066}
4067
4068/*
4069 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
4070 */
4071int ndo_dflt_fdb_del(struct ndmsg *ndm,
4072 struct nlattr *tb[],
4073 struct net_device *dev,
4074 const unsigned char *addr, u16 vid)
4075{
4076 int err = -EINVAL;
4077
4078 /* If aging addresses are supported device will need to
4079 * implement its own handler for this.
4080 */
4081 if (!(ndm->ndm_state & NUD_PERMANENT)) {
4082 pr_info("%s: FDB only supports static addresses\n", dev->name);
4083 return err;
4084 }
4085
4086 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
4087 err = dev_uc_del(dev, addr);
4088 else if (is_multicast_ether_addr(addr))
4089 err = dev_mc_del(dev, addr);
4090
4091 return err;
4092}
4093EXPORT_SYMBOL(ndo_dflt_fdb_del);
4094
4095static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
4096 struct netlink_ext_ack *extack)
4097{
4098 struct net *net = sock_net(skb->sk);
4099 struct ndmsg *ndm;
4100 struct nlattr *tb[NDA_MAX+1];
4101 struct net_device *dev;
4102 __u8 *addr;
4103 int err;
4104 u16 vid;
4105
4106 if (!netlink_capable(skb, CAP_NET_ADMIN))
4107 return -EPERM;
4108
4109 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
4110 extack);
4111 if (err < 0)
4112 return err;
4113
4114 ndm = nlmsg_data(nlh);
4115 if (ndm->ndm_ifindex == 0) {
4116 NL_SET_ERR_MSG(extack, "invalid ifindex");
4117 return -EINVAL;
4118 }
4119
4120 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4121 if (dev == NULL) {
4122 NL_SET_ERR_MSG(extack, "unknown ifindex");
4123 return -ENODEV;
4124 }
4125
4126 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4127 NL_SET_ERR_MSG(extack, "invalid address");
4128 return -EINVAL;
4129 }
4130
4131 if (dev->type != ARPHRD_ETHER) {
4132 NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
4133 return -EINVAL;
4134 }
4135
4136 addr = nla_data(tb[NDA_LLADDR]);
4137
4138 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4139 if (err)
4140 return err;
4141
4142 err = -EOPNOTSUPP;
4143
4144 /* Support fdb on master device the net/bridge default case */
4145 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4146 netif_is_bridge_port(dev)) {
4147 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4148 const struct net_device_ops *ops = br_dev->netdev_ops;
4149
4150 if (ops->ndo_fdb_del)
4151 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
4152
4153 if (err)
4154 goto out;
4155 else
4156 ndm->ndm_flags &= ~NTF_MASTER;
4157 }
4158
4159 /* Embedded bridge, macvlan, and any other device support */
4160 if (ndm->ndm_flags & NTF_SELF) {
4161 if (dev->netdev_ops->ndo_fdb_del)
4162 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
4163 vid);
4164 else
4165 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
4166
4167 if (!err) {
4168 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
4169 ndm->ndm_state);
4170 ndm->ndm_flags &= ~NTF_SELF;
4171 }
4172 }
4173out:
4174 return err;
4175}
4176
4177static int nlmsg_populate_fdb(struct sk_buff *skb,
4178 struct netlink_callback *cb,
4179 struct net_device *dev,
4180 int *idx,
4181 struct netdev_hw_addr_list *list)
4182{
4183 struct netdev_hw_addr *ha;
4184 int err;
4185 u32 portid, seq;
4186
4187 portid = NETLINK_CB(cb->skb).portid;
4188 seq = cb->nlh->nlmsg_seq;
4189
4190 list_for_each_entry(ha, &list->list, list) {
4191 if (*idx < cb->args[2])
4192 goto skip;
4193
4194 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
4195 portid, seq,
4196 RTM_NEWNEIGH, NTF_SELF,
4197 NLM_F_MULTI, NUD_PERMANENT);
4198 if (err < 0)
4199 return err;
4200skip:
4201 *idx += 1;
4202 }
4203 return 0;
4204}
4205
4206/**
4207 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
4208 * @skb: socket buffer to store message in
4209 * @cb: netlink callback
4210 * @dev: netdevice
4211 * @filter_dev: ignored
4212 * @idx: the number of FDB table entries dumped is added to *@idx
4213 *
4214 * Default netdevice operation to dump the existing unicast address list.
4215 * Returns number of addresses from list put in skb.
4216 */
4217int ndo_dflt_fdb_dump(struct sk_buff *skb,
4218 struct netlink_callback *cb,
4219 struct net_device *dev,
4220 struct net_device *filter_dev,
4221 int *idx)
4222{
4223 int err;
4224
4225 if (dev->type != ARPHRD_ETHER)
4226 return -EINVAL;
4227
4228 netif_addr_lock_bh(dev);
4229 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
4230 if (err)
4231 goto out;
4232 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
4233out:
4234 netif_addr_unlock_bh(dev);
4235 return err;
4236}
4237EXPORT_SYMBOL(ndo_dflt_fdb_dump);
4238
4239static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
4240 int *br_idx, int *brport_idx,
4241 struct netlink_ext_ack *extack)
4242{
4243 struct nlattr *tb[NDA_MAX + 1];
4244 struct ndmsg *ndm;
4245 int err, i;
4246
4247 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4248 NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
4249 return -EINVAL;
4250 }
4251
4252 ndm = nlmsg_data(nlh);
4253 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state ||
4254 ndm->ndm_flags || ndm->ndm_type) {
4255 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
4256 return -EINVAL;
4257 }
4258
4259 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4260 NDA_MAX, NULL, extack);
4261 if (err < 0)
4262 return err;
4263
4264 *brport_idx = ndm->ndm_ifindex;
4265 for (i = 0; i <= NDA_MAX; ++i) {
4266 if (!tb[i])
4267 continue;
4268
4269 switch (i) {
4270 case NDA_IFINDEX:
4271 if (nla_len(tb[i]) != sizeof(u32)) {
4272 NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
4273 return -EINVAL;
4274 }
4275 *brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
4276 break;
4277 case NDA_MASTER:
4278 if (nla_len(tb[i]) != sizeof(u32)) {
4279 NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
4280 return -EINVAL;
4281 }
4282 *br_idx = nla_get_u32(tb[NDA_MASTER]);
4283 break;
4284 default:
4285 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
4286 return -EINVAL;
4287 }
4288 }
4289
4290 return 0;
4291}
4292
4293static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
4294 int *br_idx, int *brport_idx,
4295 struct netlink_ext_ack *extack)
4296{
4297 struct nlattr *tb[IFLA_MAX+1];
4298 int err;
4299
4300 /* A hack to preserve kernel<->userspace interface.
4301 * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
4302 * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
4303 * So, check for ndmsg with an optional u32 attribute (not used here).
4304 * Fortunately these sizes don't conflict with the size of ifinfomsg
4305 * with an optional attribute.
4306 */
4307 if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
4308 (nlmsg_len(nlh) != sizeof(struct ndmsg) +
4309 nla_attr_size(sizeof(u32)))) {
4310 struct ifinfomsg *ifm;
4311
4312 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4313 tb, IFLA_MAX, ifla_policy,
4314 extack);
4315 if (err < 0) {
4316 return -EINVAL;
4317 } else if (err == 0) {
4318 if (tb[IFLA_MASTER])
4319 *br_idx = nla_get_u32(tb[IFLA_MASTER]);
4320 }
4321
4322 ifm = nlmsg_data(nlh);
4323 *brport_idx = ifm->ifi_index;
4324 }
4325 return 0;
4326}
4327
4328static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
4329{
4330 struct net_device *dev;
4331 struct net_device *br_dev = NULL;
4332 const struct net_device_ops *ops = NULL;
4333 const struct net_device_ops *cops = NULL;
4334 struct net *net = sock_net(skb->sk);
4335 struct hlist_head *head;
4336 int brport_idx = 0;
4337 int br_idx = 0;
4338 int h, s_h;
4339 int idx = 0, s_idx;
4340 int err = 0;
4341 int fidx = 0;
4342
4343 if (cb->strict_check)
4344 err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4345 cb->extack);
4346 else
4347 err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4348 cb->extack);
4349 if (err < 0)
4350 return err;
4351
4352 if (br_idx) {
4353 br_dev = __dev_get_by_index(net, br_idx);
4354 if (!br_dev)
4355 return -ENODEV;
4356
4357 ops = br_dev->netdev_ops;
4358 }
4359
4360 s_h = cb->args[0];
4361 s_idx = cb->args[1];
4362
4363 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4364 idx = 0;
4365 head = &net->dev_index_head[h];
4366 hlist_for_each_entry(dev, head, index_hlist) {
4367
4368 if (brport_idx && (dev->ifindex != brport_idx))
4369 continue;
4370
4371 if (!br_idx) { /* user did not specify a specific bridge */
4372 if (netif_is_bridge_port(dev)) {
4373 br_dev = netdev_master_upper_dev_get(dev);
4374 cops = br_dev->netdev_ops;
4375 }
4376 } else {
4377 if (dev != br_dev &&
4378 !netif_is_bridge_port(dev))
4379 continue;
4380
4381 if (br_dev != netdev_master_upper_dev_get(dev) &&
4382 !(dev->priv_flags & IFF_EBRIDGE))
4383 continue;
4384 cops = ops;
4385 }
4386
4387 if (idx < s_idx)
4388 goto cont;
4389
4390 if (netif_is_bridge_port(dev)) {
4391 if (cops && cops->ndo_fdb_dump) {
4392 err = cops->ndo_fdb_dump(skb, cb,
4393 br_dev, dev,
4394 &fidx);
4395 if (err == -EMSGSIZE)
4396 goto out;
4397 }
4398 }
4399
4400 if (dev->netdev_ops->ndo_fdb_dump)
4401 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4402 dev, NULL,
4403 &fidx);
4404 else
4405 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4406 &fidx);
4407 if (err == -EMSGSIZE)
4408 goto out;
4409
4410 cops = NULL;
4411
4412 /* reset fdb offset to 0 for rest of the interfaces */
4413 cb->args[2] = 0;
4414 fidx = 0;
4415cont:
4416 idx++;
4417 }
4418 }
4419
4420out:
4421 cb->args[0] = h;
4422 cb->args[1] = idx;
4423 cb->args[2] = fidx;
4424
4425 return skb->len;
4426}
4427
4428static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4429 struct nlattr **tb, u8 *ndm_flags,
4430 int *br_idx, int *brport_idx, u8 **addr,
4431 u16 *vid, struct netlink_ext_ack *extack)
4432{
4433 struct ndmsg *ndm;
4434 int err, i;
4435
4436 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4437 NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4438 return -EINVAL;
4439 }
4440
4441 ndm = nlmsg_data(nlh);
4442 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state ||
4443 ndm->ndm_type) {
4444 NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4445 return -EINVAL;
4446 }
4447
4448 if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4449 NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4450 return -EINVAL;
4451 }
4452
4453 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4454 NDA_MAX, nda_policy, extack);
4455 if (err < 0)
4456 return err;
4457
4458 *ndm_flags = ndm->ndm_flags;
4459 *brport_idx = ndm->ndm_ifindex;
4460 for (i = 0; i <= NDA_MAX; ++i) {
4461 if (!tb[i])
4462 continue;
4463
4464 switch (i) {
4465 case NDA_MASTER:
4466 *br_idx = nla_get_u32(tb[i]);
4467 break;
4468 case NDA_LLADDR:
4469 if (nla_len(tb[i]) != ETH_ALEN) {
4470 NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4471 return -EINVAL;
4472 }
4473 *addr = nla_data(tb[i]);
4474 break;
4475 case NDA_VLAN:
4476 err = fdb_vid_parse(tb[i], vid, extack);
4477 if (err)
4478 return err;
4479 break;
4480 case NDA_VNI:
4481 break;
4482 default:
4483 NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4484 return -EINVAL;
4485 }
4486 }
4487
4488 return 0;
4489}
4490
4491static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4492 struct netlink_ext_ack *extack)
4493{
4494 struct net_device *dev = NULL, *br_dev = NULL;
4495 const struct net_device_ops *ops = NULL;
4496 struct net *net = sock_net(in_skb->sk);
4497 struct nlattr *tb[NDA_MAX + 1];
4498 struct sk_buff *skb;
4499 int brport_idx = 0;
4500 u8 ndm_flags = 0;
4501 int br_idx = 0;
4502 u8 *addr = NULL;
4503 u16 vid = 0;
4504 int err;
4505
4506 err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4507 &brport_idx, &addr, &vid, extack);
4508 if (err < 0)
4509 return err;
4510
4511 if (!addr) {
4512 NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4513 return -EINVAL;
4514 }
4515
4516 if (brport_idx) {
4517 dev = __dev_get_by_index(net, brport_idx);
4518 if (!dev) {
4519 NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4520 return -ENODEV;
4521 }
4522 }
4523
4524 if (br_idx) {
4525 if (dev) {
4526 NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4527 return -EINVAL;
4528 }
4529
4530 br_dev = __dev_get_by_index(net, br_idx);
4531 if (!br_dev) {
4532 NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4533 return -EINVAL;
4534 }
4535 ops = br_dev->netdev_ops;
4536 }
4537
4538 if (dev) {
4539 if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4540 if (!netif_is_bridge_port(dev)) {
4541 NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4542 return -EINVAL;
4543 }
4544 br_dev = netdev_master_upper_dev_get(dev);
4545 if (!br_dev) {
4546 NL_SET_ERR_MSG(extack, "Master of device not found");
4547 return -EINVAL;
4548 }
4549 ops = br_dev->netdev_ops;
4550 } else {
4551 if (!(ndm_flags & NTF_SELF)) {
4552 NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4553 return -EINVAL;
4554 }
4555 ops = dev->netdev_ops;
4556 }
4557 }
4558
4559 if (!br_dev && !dev) {
4560 NL_SET_ERR_MSG(extack, "No device specified");
4561 return -ENODEV;
4562 }
4563
4564 if (!ops || !ops->ndo_fdb_get) {
4565 NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4566 return -EOPNOTSUPP;
4567 }
4568
4569 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4570 if (!skb)
4571 return -ENOBUFS;
4572
4573 if (br_dev)
4574 dev = br_dev;
4575 err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4576 NETLINK_CB(in_skb).portid,
4577 nlh->nlmsg_seq, extack);
4578 if (err)
4579 goto out;
4580
4581 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4582out:
4583 kfree_skb(skb);
4584 return err;
4585}
4586
4587static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4588 unsigned int attrnum, unsigned int flag)
4589{
4590 if (mask & flag)
4591 return nla_put_u8(skb, attrnum, !!(flags & flag));
4592 return 0;
4593}
4594
4595int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4596 struct net_device *dev, u16 mode,
4597 u32 flags, u32 mask, int nlflags,
4598 u32 filter_mask,
4599 int (*vlan_fill)(struct sk_buff *skb,
4600 struct net_device *dev,
4601 u32 filter_mask))
4602{
4603 struct nlmsghdr *nlh;
4604 struct ifinfomsg *ifm;
4605 struct nlattr *br_afspec;
4606 struct nlattr *protinfo;
4607 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4608 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4609 int err = 0;
4610
4611 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4612 if (nlh == NULL)
4613 return -EMSGSIZE;
4614
4615 ifm = nlmsg_data(nlh);
4616 ifm->ifi_family = AF_BRIDGE;
4617 ifm->__ifi_pad = 0;
4618 ifm->ifi_type = dev->type;
4619 ifm->ifi_index = dev->ifindex;
4620 ifm->ifi_flags = dev_get_flags(dev);
4621 ifm->ifi_change = 0;
4622
4623
4624 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4625 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4626 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4627 (br_dev &&
4628 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4629 (dev->addr_len &&
4630 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4631 (dev->ifindex != dev_get_iflink(dev) &&
4632 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4633 goto nla_put_failure;
4634
4635 br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4636 if (!br_afspec)
4637 goto nla_put_failure;
4638
4639 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4640 nla_nest_cancel(skb, br_afspec);
4641 goto nla_put_failure;
4642 }
4643
4644 if (mode != BRIDGE_MODE_UNDEF) {
4645 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4646 nla_nest_cancel(skb, br_afspec);
4647 goto nla_put_failure;
4648 }
4649 }
4650 if (vlan_fill) {
4651 err = vlan_fill(skb, dev, filter_mask);
4652 if (err) {
4653 nla_nest_cancel(skb, br_afspec);
4654 goto nla_put_failure;
4655 }
4656 }
4657 nla_nest_end(skb, br_afspec);
4658
4659 protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4660 if (!protinfo)
4661 goto nla_put_failure;
4662
4663 if (brport_nla_put_flag(skb, flags, mask,
4664 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4665 brport_nla_put_flag(skb, flags, mask,
4666 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4667 brport_nla_put_flag(skb, flags, mask,
4668 IFLA_BRPORT_FAST_LEAVE,
4669 BR_MULTICAST_FAST_LEAVE) ||
4670 brport_nla_put_flag(skb, flags, mask,
4671 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4672 brport_nla_put_flag(skb, flags, mask,
4673 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4674 brport_nla_put_flag(skb, flags, mask,
4675 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4676 brport_nla_put_flag(skb, flags, mask,
4677 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4678 brport_nla_put_flag(skb, flags, mask,
4679 IFLA_BRPORT_PROXYARP, BR_PROXYARP) ||
4680 brport_nla_put_flag(skb, flags, mask,
4681 IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) ||
4682 brport_nla_put_flag(skb, flags, mask,
4683 IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) {
4684 nla_nest_cancel(skb, protinfo);
4685 goto nla_put_failure;
4686 }
4687
4688 nla_nest_end(skb, protinfo);
4689
4690 nlmsg_end(skb, nlh);
4691 return 0;
4692nla_put_failure:
4693 nlmsg_cancel(skb, nlh);
4694 return err ? err : -EMSGSIZE;
4695}
4696EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4697
4698static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4699 bool strict_check, u32 *filter_mask,
4700 struct netlink_ext_ack *extack)
4701{
4702 struct nlattr *tb[IFLA_MAX+1];
4703 int err, i;
4704
4705 if (strict_check) {
4706 struct ifinfomsg *ifm;
4707
4708 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4709 NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4710 return -EINVAL;
4711 }
4712
4713 ifm = nlmsg_data(nlh);
4714 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4715 ifm->ifi_change || ifm->ifi_index) {
4716 NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4717 return -EINVAL;
4718 }
4719
4720 err = nlmsg_parse_deprecated_strict(nlh,
4721 sizeof(struct ifinfomsg),
4722 tb, IFLA_MAX, ifla_policy,
4723 extack);
4724 } else {
4725 err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4726 tb, IFLA_MAX, ifla_policy,
4727 extack);
4728 }
4729 if (err < 0)
4730 return err;
4731
4732 /* new attributes should only be added with strict checking */
4733 for (i = 0; i <= IFLA_MAX; ++i) {
4734 if (!tb[i])
4735 continue;
4736
4737 switch (i) {
4738 case IFLA_EXT_MASK:
4739 *filter_mask = nla_get_u32(tb[i]);
4740 break;
4741 default:
4742 if (strict_check) {
4743 NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4744 return -EINVAL;
4745 }
4746 }
4747 }
4748
4749 return 0;
4750}
4751
4752static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4753{
4754 const struct nlmsghdr *nlh = cb->nlh;
4755 struct net *net = sock_net(skb->sk);
4756 struct net_device *dev;
4757 int idx = 0;
4758 u32 portid = NETLINK_CB(cb->skb).portid;
4759 u32 seq = nlh->nlmsg_seq;
4760 u32 filter_mask = 0;
4761 int err;
4762
4763 err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4764 cb->extack);
4765 if (err < 0 && cb->strict_check)
4766 return err;
4767
4768 rcu_read_lock();
4769 for_each_netdev_rcu(net, dev) {
4770 const struct net_device_ops *ops = dev->netdev_ops;
4771 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4772
4773 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4774 if (idx >= cb->args[0]) {
4775 err = br_dev->netdev_ops->ndo_bridge_getlink(
4776 skb, portid, seq, dev,
4777 filter_mask, NLM_F_MULTI);
4778 if (err < 0 && err != -EOPNOTSUPP) {
4779 if (likely(skb->len))
4780 break;
4781
4782 goto out_err;
4783 }
4784 }
4785 idx++;
4786 }
4787
4788 if (ops->ndo_bridge_getlink) {
4789 if (idx >= cb->args[0]) {
4790 err = ops->ndo_bridge_getlink(skb, portid,
4791 seq, dev,
4792 filter_mask,
4793 NLM_F_MULTI);
4794 if (err < 0 && err != -EOPNOTSUPP) {
4795 if (likely(skb->len))
4796 break;
4797
4798 goto out_err;
4799 }
4800 }
4801 idx++;
4802 }
4803 }
4804 err = skb->len;
4805out_err:
4806 rcu_read_unlock();
4807 cb->args[0] = idx;
4808
4809 return err;
4810}
4811
4812static inline size_t bridge_nlmsg_size(void)
4813{
4814 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4815 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4816 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4817 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
4818 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
4819 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
4820 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
4821 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
4822 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
4823 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
4824 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
4825}
4826
4827static int rtnl_bridge_notify(struct net_device *dev)
4828{
4829 struct net *net = dev_net(dev);
4830 struct sk_buff *skb;
4831 int err = -EOPNOTSUPP;
4832
4833 if (!dev->netdev_ops->ndo_bridge_getlink)
4834 return 0;
4835
4836 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4837 if (!skb) {
4838 err = -ENOMEM;
4839 goto errout;
4840 }
4841
4842 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4843 if (err < 0)
4844 goto errout;
4845
4846 if (!skb->len)
4847 goto errout;
4848
4849 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4850 return 0;
4851errout:
4852 WARN_ON(err == -EMSGSIZE);
4853 kfree_skb(skb);
4854 if (err)
4855 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4856 return err;
4857}
4858
4859static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4860 struct netlink_ext_ack *extack)
4861{
4862 struct net *net = sock_net(skb->sk);
4863 struct ifinfomsg *ifm;
4864 struct net_device *dev;
4865 struct nlattr *br_spec, *attr = NULL;
4866 int rem, err = -EOPNOTSUPP;
4867 u16 flags = 0;
4868 bool have_flags = false;
4869
4870 if (nlmsg_len(nlh) < sizeof(*ifm))
4871 return -EINVAL;
4872
4873 ifm = nlmsg_data(nlh);
4874 if (ifm->ifi_family != AF_BRIDGE)
4875 return -EPFNOSUPPORT;
4876
4877 dev = __dev_get_by_index(net, ifm->ifi_index);
4878 if (!dev) {
4879 NL_SET_ERR_MSG(extack, "unknown ifindex");
4880 return -ENODEV;
4881 }
4882
4883 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4884 if (br_spec) {
4885 nla_for_each_nested(attr, br_spec, rem) {
4886 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4887 if (nla_len(attr) < sizeof(flags))
4888 return -EINVAL;
4889
4890 have_flags = true;
4891 flags = nla_get_u16(attr);
4892 break;
4893 }
4894 }
4895 }
4896
4897 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4898 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4899
4900 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4901 err = -EOPNOTSUPP;
4902 goto out;
4903 }
4904
4905 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
4906 extack);
4907 if (err)
4908 goto out;
4909
4910 flags &= ~BRIDGE_FLAGS_MASTER;
4911 }
4912
4913 if ((flags & BRIDGE_FLAGS_SELF)) {
4914 if (!dev->netdev_ops->ndo_bridge_setlink)
4915 err = -EOPNOTSUPP;
4916 else
4917 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4918 flags,
4919 extack);
4920 if (!err) {
4921 flags &= ~BRIDGE_FLAGS_SELF;
4922
4923 /* Generate event to notify upper layer of bridge
4924 * change
4925 */
4926 err = rtnl_bridge_notify(dev);
4927 }
4928 }
4929
4930 if (have_flags)
4931 memcpy(nla_data(attr), &flags, sizeof(flags));
4932out:
4933 return err;
4934}
4935
4936static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4937 struct netlink_ext_ack *extack)
4938{
4939 struct net *net = sock_net(skb->sk);
4940 struct ifinfomsg *ifm;
4941 struct net_device *dev;
4942 struct nlattr *br_spec, *attr = NULL;
4943 int rem, err = -EOPNOTSUPP;
4944 u16 flags = 0;
4945 bool have_flags = false;
4946
4947 if (nlmsg_len(nlh) < sizeof(*ifm))
4948 return -EINVAL;
4949
4950 ifm = nlmsg_data(nlh);
4951 if (ifm->ifi_family != AF_BRIDGE)
4952 return -EPFNOSUPPORT;
4953
4954 dev = __dev_get_by_index(net, ifm->ifi_index);
4955 if (!dev) {
4956 NL_SET_ERR_MSG(extack, "unknown ifindex");
4957 return -ENODEV;
4958 }
4959
4960 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4961 if (br_spec) {
4962 nla_for_each_nested(attr, br_spec, rem) {
4963 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4964 if (nla_len(attr) < sizeof(flags))
4965 return -EINVAL;
4966
4967 have_flags = true;
4968 flags = nla_get_u16(attr);
4969 break;
4970 }
4971 }
4972 }
4973
4974 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4975 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4976
4977 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4978 err = -EOPNOTSUPP;
4979 goto out;
4980 }
4981
4982 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4983 if (err)
4984 goto out;
4985
4986 flags &= ~BRIDGE_FLAGS_MASTER;
4987 }
4988
4989 if ((flags & BRIDGE_FLAGS_SELF)) {
4990 if (!dev->netdev_ops->ndo_bridge_dellink)
4991 err = -EOPNOTSUPP;
4992 else
4993 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
4994 flags);
4995
4996 if (!err) {
4997 flags &= ~BRIDGE_FLAGS_SELF;
4998
4999 /* Generate event to notify upper layer of bridge
5000 * change
5001 */
5002 err = rtnl_bridge_notify(dev);
5003 }
5004 }
5005
5006 if (have_flags)
5007 memcpy(nla_data(attr), &flags, sizeof(flags));
5008out:
5009 return err;
5010}
5011
5012static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
5013{
5014 return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
5015 (!idxattr || idxattr == attrid);
5016}
5017
5018#define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
5019static int rtnl_get_offload_stats_attr_size(int attr_id)
5020{
5021 switch (attr_id) {
5022 case IFLA_OFFLOAD_XSTATS_CPU_HIT:
5023 return sizeof(struct rtnl_link_stats64);
5024 }
5025
5026 return 0;
5027}
5028
5029static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
5030 int *prividx)
5031{
5032 struct nlattr *attr = NULL;
5033 int attr_id, size;
5034 void *attr_data;
5035 int err;
5036
5037 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
5038 dev->netdev_ops->ndo_get_offload_stats))
5039 return -ENODATA;
5040
5041 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
5042 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
5043 if (attr_id < *prividx)
5044 continue;
5045
5046 size = rtnl_get_offload_stats_attr_size(attr_id);
5047 if (!size)
5048 continue;
5049
5050 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
5051 continue;
5052
5053 attr = nla_reserve_64bit(skb, attr_id, size,
5054 IFLA_OFFLOAD_XSTATS_UNSPEC);
5055 if (!attr)
5056 goto nla_put_failure;
5057
5058 attr_data = nla_data(attr);
5059 memset(attr_data, 0, size);
5060 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
5061 attr_data);
5062 if (err)
5063 goto get_offload_stats_failure;
5064 }
5065
5066 if (!attr)
5067 return -ENODATA;
5068
5069 *prividx = 0;
5070 return 0;
5071
5072nla_put_failure:
5073 err = -EMSGSIZE;
5074get_offload_stats_failure:
5075 *prividx = attr_id;
5076 return err;
5077}
5078
5079static int rtnl_get_offload_stats_size(const struct net_device *dev)
5080{
5081 int nla_size = 0;
5082 int attr_id;
5083 int size;
5084
5085 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
5086 dev->netdev_ops->ndo_get_offload_stats))
5087 return 0;
5088
5089 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
5090 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
5091 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
5092 continue;
5093 size = rtnl_get_offload_stats_attr_size(attr_id);
5094 nla_size += nla_total_size_64bit(size);
5095 }
5096
5097 if (nla_size != 0)
5098 nla_size += nla_total_size(0);
5099
5100 return nla_size;
5101}
5102
5103static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
5104 int type, u32 pid, u32 seq, u32 change,
5105 unsigned int flags, unsigned int filter_mask,
5106 int *idxattr, int *prividx)
5107{
5108 struct if_stats_msg *ifsm;
5109 struct nlmsghdr *nlh;
5110 struct nlattr *attr;
5111 int s_prividx = *prividx;
5112 int err;
5113
5114 ASSERT_RTNL();
5115
5116 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
5117 if (!nlh)
5118 return -EMSGSIZE;
5119
5120 ifsm = nlmsg_data(nlh);
5121 ifsm->family = PF_UNSPEC;
5122 ifsm->pad1 = 0;
5123 ifsm->pad2 = 0;
5124 ifsm->ifindex = dev->ifindex;
5125 ifsm->filter_mask = filter_mask;
5126
5127 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
5128 struct rtnl_link_stats64 *sp;
5129
5130 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
5131 sizeof(struct rtnl_link_stats64),
5132 IFLA_STATS_UNSPEC);
5133 if (!attr)
5134 goto nla_put_failure;
5135
5136 sp = nla_data(attr);
5137 dev_get_stats(dev, sp);
5138 }
5139
5140 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
5141 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5142
5143 if (ops && ops->fill_linkxstats) {
5144 *idxattr = IFLA_STATS_LINK_XSTATS;
5145 attr = nla_nest_start_noflag(skb,
5146 IFLA_STATS_LINK_XSTATS);
5147 if (!attr)
5148 goto nla_put_failure;
5149
5150 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5151 nla_nest_end(skb, attr);
5152 if (err)
5153 goto nla_put_failure;
5154 *idxattr = 0;
5155 }
5156 }
5157
5158 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
5159 *idxattr)) {
5160 const struct rtnl_link_ops *ops = NULL;
5161 const struct net_device *master;
5162
5163 master = netdev_master_upper_dev_get(dev);
5164 if (master)
5165 ops = master->rtnl_link_ops;
5166 if (ops && ops->fill_linkxstats) {
5167 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
5168 attr = nla_nest_start_noflag(skb,
5169 IFLA_STATS_LINK_XSTATS_SLAVE);
5170 if (!attr)
5171 goto nla_put_failure;
5172
5173 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5174 nla_nest_end(skb, attr);
5175 if (err)
5176 goto nla_put_failure;
5177 *idxattr = 0;
5178 }
5179 }
5180
5181 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
5182 *idxattr)) {
5183 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
5184 attr = nla_nest_start_noflag(skb,
5185 IFLA_STATS_LINK_OFFLOAD_XSTATS);
5186 if (!attr)
5187 goto nla_put_failure;
5188
5189 err = rtnl_get_offload_stats(skb, dev, prividx);
5190 if (err == -ENODATA)
5191 nla_nest_cancel(skb, attr);
5192 else
5193 nla_nest_end(skb, attr);
5194
5195 if (err && err != -ENODATA)
5196 goto nla_put_failure;
5197 *idxattr = 0;
5198 }
5199
5200 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
5201 struct rtnl_af_ops *af_ops;
5202
5203 *idxattr = IFLA_STATS_AF_SPEC;
5204 attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
5205 if (!attr)
5206 goto nla_put_failure;
5207
5208 rcu_read_lock();
5209 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5210 if (af_ops->fill_stats_af) {
5211 struct nlattr *af;
5212 int err;
5213
5214 af = nla_nest_start_noflag(skb,
5215 af_ops->family);
5216 if (!af) {
5217 rcu_read_unlock();
5218 goto nla_put_failure;
5219 }
5220 err = af_ops->fill_stats_af(skb, dev);
5221
5222 if (err == -ENODATA) {
5223 nla_nest_cancel(skb, af);
5224 } else if (err < 0) {
5225 rcu_read_unlock();
5226 goto nla_put_failure;
5227 }
5228
5229 nla_nest_end(skb, af);
5230 }
5231 }
5232 rcu_read_unlock();
5233
5234 nla_nest_end(skb, attr);
5235
5236 *idxattr = 0;
5237 }
5238
5239 nlmsg_end(skb, nlh);
5240
5241 return 0;
5242
5243nla_put_failure:
5244 /* not a multi message or no progress mean a real error */
5245 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
5246 nlmsg_cancel(skb, nlh);
5247 else
5248 nlmsg_end(skb, nlh);
5249
5250 return -EMSGSIZE;
5251}
5252
5253static size_t if_nlmsg_stats_size(const struct net_device *dev,
5254 u32 filter_mask)
5255{
5256 size_t size = 0;
5257
5258 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
5259 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
5260
5261 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
5262 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5263 int attr = IFLA_STATS_LINK_XSTATS;
5264
5265 if (ops && ops->get_linkxstats_size) {
5266 size += nla_total_size(ops->get_linkxstats_size(dev,
5267 attr));
5268 /* for IFLA_STATS_LINK_XSTATS */
5269 size += nla_total_size(0);
5270 }
5271 }
5272
5273 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
5274 struct net_device *_dev = (struct net_device *)dev;
5275 const struct rtnl_link_ops *ops = NULL;
5276 const struct net_device *master;
5277
5278 /* netdev_master_upper_dev_get can't take const */
5279 master = netdev_master_upper_dev_get(_dev);
5280 if (master)
5281 ops = master->rtnl_link_ops;
5282 if (ops && ops->get_linkxstats_size) {
5283 int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
5284
5285 size += nla_total_size(ops->get_linkxstats_size(dev,
5286 attr));
5287 /* for IFLA_STATS_LINK_XSTATS_SLAVE */
5288 size += nla_total_size(0);
5289 }
5290 }
5291
5292 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
5293 size += rtnl_get_offload_stats_size(dev);
5294
5295 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
5296 struct rtnl_af_ops *af_ops;
5297
5298 /* for IFLA_STATS_AF_SPEC */
5299 size += nla_total_size(0);
5300
5301 rcu_read_lock();
5302 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5303 if (af_ops->get_stats_af_size) {
5304 size += nla_total_size(
5305 af_ops->get_stats_af_size(dev));
5306
5307 /* for AF_* */
5308 size += nla_total_size(0);
5309 }
5310 }
5311 rcu_read_unlock();
5312 }
5313
5314 return size;
5315}
5316
5317static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
5318 bool is_dump, struct netlink_ext_ack *extack)
5319{
5320 struct if_stats_msg *ifsm;
5321
5322 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
5323 NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
5324 return -EINVAL;
5325 }
5326
5327 if (!strict_check)
5328 return 0;
5329
5330 ifsm = nlmsg_data(nlh);
5331
5332 /* only requests using strict checks can pass data to influence
5333 * the dump. The legacy exception is filter_mask.
5334 */
5335 if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
5336 NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
5337 return -EINVAL;
5338 }
5339 if (nlmsg_attrlen(nlh, sizeof(*ifsm))) {
5340 NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
5341 return -EINVAL;
5342 }
5343 if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5344 NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5345 return -EINVAL;
5346 }
5347
5348 return 0;
5349}
5350
5351static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5352 struct netlink_ext_ack *extack)
5353{
5354 struct net *net = sock_net(skb->sk);
5355 struct net_device *dev = NULL;
5356 int idxattr = 0, prividx = 0;
5357 struct if_stats_msg *ifsm;
5358 struct sk_buff *nskb;
5359 u32 filter_mask;
5360 int err;
5361
5362 err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5363 false, extack);
5364 if (err)
5365 return err;
5366
5367 ifsm = nlmsg_data(nlh);
5368 if (ifsm->ifindex > 0)
5369 dev = __dev_get_by_index(net, ifsm->ifindex);
5370 else
5371 return -EINVAL;
5372
5373 if (!dev)
5374 return -ENODEV;
5375
5376 filter_mask = ifsm->filter_mask;
5377 if (!filter_mask)
5378 return -EINVAL;
5379
5380 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
5381 if (!nskb)
5382 return -ENOBUFS;
5383
5384 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5385 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5386 0, filter_mask, &idxattr, &prividx);
5387 if (err < 0) {
5388 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5389 WARN_ON(err == -EMSGSIZE);
5390 kfree_skb(nskb);
5391 } else {
5392 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5393 }
5394
5395 return err;
5396}
5397
5398static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5399{
5400 struct netlink_ext_ack *extack = cb->extack;
5401 int h, s_h, err, s_idx, s_idxattr, s_prividx;
5402 struct net *net = sock_net(skb->sk);
5403 unsigned int flags = NLM_F_MULTI;
5404 struct if_stats_msg *ifsm;
5405 struct hlist_head *head;
5406 struct net_device *dev;
5407 u32 filter_mask = 0;
5408 int idx = 0;
5409
5410 s_h = cb->args[0];
5411 s_idx = cb->args[1];
5412 s_idxattr = cb->args[2];
5413 s_prividx = cb->args[3];
5414
5415 cb->seq = net->dev_base_seq;
5416
5417 err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5418 if (err)
5419 return err;
5420
5421 ifsm = nlmsg_data(cb->nlh);
5422 filter_mask = ifsm->filter_mask;
5423 if (!filter_mask) {
5424 NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5425 return -EINVAL;
5426 }
5427
5428 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5429 idx = 0;
5430 head = &net->dev_index_head[h];
5431 hlist_for_each_entry(dev, head, index_hlist) {
5432 if (idx < s_idx)
5433 goto cont;
5434 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5435 NETLINK_CB(cb->skb).portid,
5436 cb->nlh->nlmsg_seq, 0,
5437 flags, filter_mask,
5438 &s_idxattr, &s_prividx);
5439 /* If we ran out of room on the first message,
5440 * we're in trouble
5441 */
5442 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5443
5444 if (err < 0)
5445 goto out;
5446 s_prividx = 0;
5447 s_idxattr = 0;
5448 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5449cont:
5450 idx++;
5451 }
5452 }
5453out:
5454 cb->args[3] = s_prividx;
5455 cb->args[2] = s_idxattr;
5456 cb->args[1] = idx;
5457 cb->args[0] = h;
5458
5459 return skb->len;
5460}
5461
5462/* Process one rtnetlink message. */
5463
5464static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5465 struct netlink_ext_ack *extack)
5466{
5467 struct net *net = sock_net(skb->sk);
5468 struct rtnl_link *link;
5469 struct module *owner;
5470 int err = -EOPNOTSUPP;
5471 rtnl_doit_func doit;
5472 unsigned int flags;
5473 int kind;
5474 int family;
5475 int type;
5476
5477 type = nlh->nlmsg_type;
5478 if (type > RTM_MAX)
5479 return -EOPNOTSUPP;
5480
5481 type -= RTM_BASE;
5482
5483 /* All the messages must have at least 1 byte length */
5484 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
5485 return 0;
5486
5487 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
5488 kind = type&3;
5489
5490 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
5491 return -EPERM;
5492
5493 rcu_read_lock();
5494 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
5495 struct sock *rtnl;
5496 rtnl_dumpit_func dumpit;
5497 u16 min_dump_alloc = 0;
5498
5499 link = rtnl_get_link(family, type);
5500 if (!link || !link->dumpit) {
5501 family = PF_UNSPEC;
5502 link = rtnl_get_link(family, type);
5503 if (!link || !link->dumpit)
5504 goto err_unlock;
5505 }
5506 owner = link->owner;
5507 dumpit = link->dumpit;
5508
5509 if (type == RTM_GETLINK - RTM_BASE)
5510 min_dump_alloc = rtnl_calcit(skb, nlh);
5511
5512 err = 0;
5513 /* need to do this before rcu_read_unlock() */
5514 if (!try_module_get(owner))
5515 err = -EPROTONOSUPPORT;
5516
5517 rcu_read_unlock();
5518
5519 rtnl = net->rtnl;
5520 if (err == 0) {
5521 struct netlink_dump_control c = {
5522 .dump = dumpit,
5523 .min_dump_alloc = min_dump_alloc,
5524 .module = owner,
5525 };
5526 err = netlink_dump_start(rtnl, skb, nlh, &c);
5527 /* netlink_dump_start() will keep a reference on
5528 * module if dump is still in progress.
5529 */
5530 module_put(owner);
5531 }
5532 return err;
5533 }
5534
5535 link = rtnl_get_link(family, type);
5536 if (!link || !link->doit) {
5537 family = PF_UNSPEC;
5538 link = rtnl_get_link(PF_UNSPEC, type);
5539 if (!link || !link->doit)
5540 goto out_unlock;
5541 }
5542
5543 owner = link->owner;
5544 if (!try_module_get(owner)) {
5545 err = -EPROTONOSUPPORT;
5546 goto out_unlock;
5547 }
5548
5549 flags = link->flags;
5550 if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
5551 doit = link->doit;
5552 rcu_read_unlock();
5553 if (doit)
5554 err = doit(skb, nlh, extack);
5555 module_put(owner);
5556 return err;
5557 }
5558 rcu_read_unlock();
5559
5560 rtnl_lock();
5561 link = rtnl_get_link(family, type);
5562 if (link && link->doit)
5563 err = link->doit(skb, nlh, extack);
5564 rtnl_unlock();
5565
5566 module_put(owner);
5567
5568 return err;
5569
5570out_unlock:
5571 rcu_read_unlock();
5572 return err;
5573
5574err_unlock:
5575 rcu_read_unlock();
5576 return -EOPNOTSUPP;
5577}
5578
5579static void rtnetlink_rcv(struct sk_buff *skb)
5580{
5581 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
5582}
5583
5584static int rtnetlink_bind(struct net *net, int group)
5585{
5586 switch (group) {
5587 case RTNLGRP_IPV4_MROUTE_R:
5588 case RTNLGRP_IPV6_MROUTE_R:
5589 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5590 return -EPERM;
5591 break;
5592 }
5593 return 0;
5594}
5595
5596static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
5597{
5598 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5599
5600 switch (event) {
5601 case NETDEV_REBOOT:
5602 case NETDEV_CHANGEMTU:
5603 case NETDEV_CHANGEADDR:
5604 case NETDEV_CHANGENAME:
5605 case NETDEV_FEAT_CHANGE:
5606 case NETDEV_BONDING_FAILOVER:
5607 case NETDEV_POST_TYPE_CHANGE:
5608 case NETDEV_NOTIFY_PEERS:
5609 case NETDEV_CHANGEUPPER:
5610 case NETDEV_RESEND_IGMP:
5611 case NETDEV_CHANGEINFODATA:
5612 case NETDEV_CHANGELOWERSTATE:
5613 case NETDEV_CHANGE_TX_QUEUE_LEN:
5614 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
5615 GFP_KERNEL, NULL, 0);
5616 break;
5617 default:
5618 break;
5619 }
5620 return NOTIFY_DONE;
5621}
5622
5623static struct notifier_block rtnetlink_dev_notifier = {
5624 .notifier_call = rtnetlink_event,
5625};
5626
5627
5628static int __net_init rtnetlink_net_init(struct net *net)
5629{
5630 struct sock *sk;
5631 struct netlink_kernel_cfg cfg = {
5632 .groups = RTNLGRP_MAX,
5633 .input = rtnetlink_rcv,
5634 .cb_mutex = &rtnl_mutex,
5635 .flags = NL_CFG_F_NONROOT_RECV,
5636 .bind = rtnetlink_bind,
5637 };
5638
5639 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
5640 if (!sk)
5641 return -ENOMEM;
5642 net->rtnl = sk;
5643 return 0;
5644}
5645
5646static void __net_exit rtnetlink_net_exit(struct net *net)
5647{
5648 netlink_kernel_release(net->rtnl);
5649 net->rtnl = NULL;
5650}
5651
5652static struct pernet_operations rtnetlink_net_ops = {
5653 .init = rtnetlink_net_init,
5654 .exit = rtnetlink_net_exit,
5655};
5656
5657void __init rtnetlink_init(void)
5658{
5659 if (register_pernet_subsys(&rtnetlink_net_ops))
5660 panic("rtnetlink_init: cannot initialize rtnetlink\n");
5661
5662 register_netdevice_notifier(&rtnetlink_dev_notifier);
5663
5664 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
5665 rtnl_dump_ifinfo, 0);
5666 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
5667 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
5668 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
5669
5670 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
5671 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
5672 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
5673
5674 rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
5675 rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
5676
5677 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
5678 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
5679 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
5680
5681 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
5682 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
5683 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
5684
5685 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
5686 0);
5687}
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/errno.h>
20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/socket.h>
23#include <linux/kernel.h>
24#include <linux/timer.h>
25#include <linux/string.h>
26#include <linux/sockios.h>
27#include <linux/net.h>
28#include <linux/fcntl.h>
29#include <linux/mm.h>
30#include <linux/slab.h>
31#include <linux/interrupt.h>
32#include <linux/capability.h>
33#include <linux/skbuff.h>
34#include <linux/init.h>
35#include <linux/security.h>
36#include <linux/mutex.h>
37#include <linux/if_addr.h>
38#include <linux/if_bridge.h>
39#include <linux/pci.h>
40#include <linux/etherdevice.h>
41
42#include <asm/uaccess.h>
43
44#include <linux/inet.h>
45#include <linux/netdevice.h>
46#include <net/ip.h>
47#include <net/protocol.h>
48#include <net/arp.h>
49#include <net/route.h>
50#include <net/udp.h>
51#include <net/sock.h>
52#include <net/pkt_sched.h>
53#include <net/fib_rules.h>
54#include <net/rtnetlink.h>
55#include <net/net_namespace.h>
56
57struct rtnl_link {
58 rtnl_doit_func doit;
59 rtnl_dumpit_func dumpit;
60 rtnl_calcit_func calcit;
61};
62
63static DEFINE_MUTEX(rtnl_mutex);
64
65void rtnl_lock(void)
66{
67 mutex_lock(&rtnl_mutex);
68}
69EXPORT_SYMBOL(rtnl_lock);
70
71void __rtnl_unlock(void)
72{
73 mutex_unlock(&rtnl_mutex);
74}
75
76void rtnl_unlock(void)
77{
78 /* This fellow will unlock it for us. */
79 netdev_run_todo();
80}
81EXPORT_SYMBOL(rtnl_unlock);
82
83int rtnl_trylock(void)
84{
85 return mutex_trylock(&rtnl_mutex);
86}
87EXPORT_SYMBOL(rtnl_trylock);
88
89int rtnl_is_locked(void)
90{
91 return mutex_is_locked(&rtnl_mutex);
92}
93EXPORT_SYMBOL(rtnl_is_locked);
94
95#ifdef CONFIG_PROVE_LOCKING
96int lockdep_rtnl_is_held(void)
97{
98 return lockdep_is_held(&rtnl_mutex);
99}
100EXPORT_SYMBOL(lockdep_rtnl_is_held);
101#endif /* #ifdef CONFIG_PROVE_LOCKING */
102
103static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
104
105static inline int rtm_msgindex(int msgtype)
106{
107 int msgindex = msgtype - RTM_BASE;
108
109 /*
110 * msgindex < 0 implies someone tried to register a netlink
111 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
112 * the message type has not been added to linux/rtnetlink.h
113 */
114 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
115
116 return msgindex;
117}
118
119static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
120{
121 struct rtnl_link *tab;
122
123 if (protocol <= RTNL_FAMILY_MAX)
124 tab = rtnl_msg_handlers[protocol];
125 else
126 tab = NULL;
127
128 if (tab == NULL || tab[msgindex].doit == NULL)
129 tab = rtnl_msg_handlers[PF_UNSPEC];
130
131 return tab ? tab[msgindex].doit : NULL;
132}
133
134static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
135{
136 struct rtnl_link *tab;
137
138 if (protocol <= RTNL_FAMILY_MAX)
139 tab = rtnl_msg_handlers[protocol];
140 else
141 tab = NULL;
142
143 if (tab == NULL || tab[msgindex].dumpit == NULL)
144 tab = rtnl_msg_handlers[PF_UNSPEC];
145
146 return tab ? tab[msgindex].dumpit : NULL;
147}
148
149static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
150{
151 struct rtnl_link *tab;
152
153 if (protocol <= RTNL_FAMILY_MAX)
154 tab = rtnl_msg_handlers[protocol];
155 else
156 tab = NULL;
157
158 if (tab == NULL || tab[msgindex].calcit == NULL)
159 tab = rtnl_msg_handlers[PF_UNSPEC];
160
161 return tab ? tab[msgindex].calcit : NULL;
162}
163
164/**
165 * __rtnl_register - Register a rtnetlink message type
166 * @protocol: Protocol family or PF_UNSPEC
167 * @msgtype: rtnetlink message type
168 * @doit: Function pointer called for each request message
169 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
170 * @calcit: Function pointer to calc size of dump message
171 *
172 * Registers the specified function pointers (at least one of them has
173 * to be non-NULL) to be called whenever a request message for the
174 * specified protocol family and message type is received.
175 *
176 * The special protocol family PF_UNSPEC may be used to define fallback
177 * function pointers for the case when no entry for the specific protocol
178 * family exists.
179 *
180 * Returns 0 on success or a negative error code.
181 */
182int __rtnl_register(int protocol, int msgtype,
183 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
184 rtnl_calcit_func calcit)
185{
186 struct rtnl_link *tab;
187 int msgindex;
188
189 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
190 msgindex = rtm_msgindex(msgtype);
191
192 tab = rtnl_msg_handlers[protocol];
193 if (tab == NULL) {
194 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
195 if (tab == NULL)
196 return -ENOBUFS;
197
198 rtnl_msg_handlers[protocol] = tab;
199 }
200
201 if (doit)
202 tab[msgindex].doit = doit;
203
204 if (dumpit)
205 tab[msgindex].dumpit = dumpit;
206
207 if (calcit)
208 tab[msgindex].calcit = calcit;
209
210 return 0;
211}
212EXPORT_SYMBOL_GPL(__rtnl_register);
213
214/**
215 * rtnl_register - Register a rtnetlink message type
216 *
217 * Identical to __rtnl_register() but panics on failure. This is useful
218 * as failure of this function is very unlikely, it can only happen due
219 * to lack of memory when allocating the chain to store all message
220 * handlers for a protocol. Meant for use in init functions where lack
221 * of memory implies no sense in continuing.
222 */
223void rtnl_register(int protocol, int msgtype,
224 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
225 rtnl_calcit_func calcit)
226{
227 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
228 panic("Unable to register rtnetlink message handler, "
229 "protocol = %d, message type = %d\n",
230 protocol, msgtype);
231}
232EXPORT_SYMBOL_GPL(rtnl_register);
233
234/**
235 * rtnl_unregister - Unregister a rtnetlink message type
236 * @protocol: Protocol family or PF_UNSPEC
237 * @msgtype: rtnetlink message type
238 *
239 * Returns 0 on success or a negative error code.
240 */
241int rtnl_unregister(int protocol, int msgtype)
242{
243 int msgindex;
244
245 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
246 msgindex = rtm_msgindex(msgtype);
247
248 if (rtnl_msg_handlers[protocol] == NULL)
249 return -ENOENT;
250
251 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
252 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
253
254 return 0;
255}
256EXPORT_SYMBOL_GPL(rtnl_unregister);
257
258/**
259 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
260 * @protocol : Protocol family or PF_UNSPEC
261 *
262 * Identical to calling rtnl_unregster() for all registered message types
263 * of a certain protocol family.
264 */
265void rtnl_unregister_all(int protocol)
266{
267 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
268
269 kfree(rtnl_msg_handlers[protocol]);
270 rtnl_msg_handlers[protocol] = NULL;
271}
272EXPORT_SYMBOL_GPL(rtnl_unregister_all);
273
274static LIST_HEAD(link_ops);
275
276static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
277{
278 const struct rtnl_link_ops *ops;
279
280 list_for_each_entry(ops, &link_ops, list) {
281 if (!strcmp(ops->kind, kind))
282 return ops;
283 }
284 return NULL;
285}
286
287/**
288 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
289 * @ops: struct rtnl_link_ops * to register
290 *
291 * The caller must hold the rtnl_mutex. This function should be used
292 * by drivers that create devices during module initialization. It
293 * must be called before registering the devices.
294 *
295 * Returns 0 on success or a negative error code.
296 */
297int __rtnl_link_register(struct rtnl_link_ops *ops)
298{
299 if (rtnl_link_ops_get(ops->kind))
300 return -EEXIST;
301
302 if (!ops->dellink)
303 ops->dellink = unregister_netdevice_queue;
304
305 list_add_tail(&ops->list, &link_ops);
306 return 0;
307}
308EXPORT_SYMBOL_GPL(__rtnl_link_register);
309
310/**
311 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
312 * @ops: struct rtnl_link_ops * to register
313 *
314 * Returns 0 on success or a negative error code.
315 */
316int rtnl_link_register(struct rtnl_link_ops *ops)
317{
318 int err;
319
320 rtnl_lock();
321 err = __rtnl_link_register(ops);
322 rtnl_unlock();
323 return err;
324}
325EXPORT_SYMBOL_GPL(rtnl_link_register);
326
327static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
328{
329 struct net_device *dev;
330 LIST_HEAD(list_kill);
331
332 for_each_netdev(net, dev) {
333 if (dev->rtnl_link_ops == ops)
334 ops->dellink(dev, &list_kill);
335 }
336 unregister_netdevice_many(&list_kill);
337}
338
339/**
340 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
341 * @ops: struct rtnl_link_ops * to unregister
342 *
343 * The caller must hold the rtnl_mutex.
344 */
345void __rtnl_link_unregister(struct rtnl_link_ops *ops)
346{
347 struct net *net;
348
349 for_each_net(net) {
350 __rtnl_kill_links(net, ops);
351 }
352 list_del(&ops->list);
353}
354EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
355
356/**
357 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
358 * @ops: struct rtnl_link_ops * to unregister
359 */
360void rtnl_link_unregister(struct rtnl_link_ops *ops)
361{
362 rtnl_lock();
363 __rtnl_link_unregister(ops);
364 rtnl_unlock();
365}
366EXPORT_SYMBOL_GPL(rtnl_link_unregister);
367
368static size_t rtnl_link_get_size(const struct net_device *dev)
369{
370 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
371 size_t size;
372
373 if (!ops)
374 return 0;
375
376 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
377 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
378
379 if (ops->get_size)
380 /* IFLA_INFO_DATA + nested data */
381 size += nla_total_size(sizeof(struct nlattr)) +
382 ops->get_size(dev);
383
384 if (ops->get_xstats_size)
385 /* IFLA_INFO_XSTATS */
386 size += nla_total_size(ops->get_xstats_size(dev));
387
388 return size;
389}
390
391static LIST_HEAD(rtnl_af_ops);
392
393static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
394{
395 const struct rtnl_af_ops *ops;
396
397 list_for_each_entry(ops, &rtnl_af_ops, list) {
398 if (ops->family == family)
399 return ops;
400 }
401
402 return NULL;
403}
404
405/**
406 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
407 * @ops: struct rtnl_af_ops * to register
408 *
409 * The caller must hold the rtnl_mutex.
410 *
411 * Returns 0 on success or a negative error code.
412 */
413int __rtnl_af_register(struct rtnl_af_ops *ops)
414{
415 list_add_tail(&ops->list, &rtnl_af_ops);
416 return 0;
417}
418EXPORT_SYMBOL_GPL(__rtnl_af_register);
419
420/**
421 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
422 * @ops: struct rtnl_af_ops * to register
423 *
424 * Returns 0 on success or a negative error code.
425 */
426int rtnl_af_register(struct rtnl_af_ops *ops)
427{
428 int err;
429
430 rtnl_lock();
431 err = __rtnl_af_register(ops);
432 rtnl_unlock();
433 return err;
434}
435EXPORT_SYMBOL_GPL(rtnl_af_register);
436
437/**
438 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
439 * @ops: struct rtnl_af_ops * to unregister
440 *
441 * The caller must hold the rtnl_mutex.
442 */
443void __rtnl_af_unregister(struct rtnl_af_ops *ops)
444{
445 list_del(&ops->list);
446}
447EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
448
449/**
450 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
451 * @ops: struct rtnl_af_ops * to unregister
452 */
453void rtnl_af_unregister(struct rtnl_af_ops *ops)
454{
455 rtnl_lock();
456 __rtnl_af_unregister(ops);
457 rtnl_unlock();
458}
459EXPORT_SYMBOL_GPL(rtnl_af_unregister);
460
461static size_t rtnl_link_get_af_size(const struct net_device *dev)
462{
463 struct rtnl_af_ops *af_ops;
464 size_t size;
465
466 /* IFLA_AF_SPEC */
467 size = nla_total_size(sizeof(struct nlattr));
468
469 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
470 if (af_ops->get_link_af_size) {
471 /* AF_* + nested data */
472 size += nla_total_size(sizeof(struct nlattr)) +
473 af_ops->get_link_af_size(dev);
474 }
475 }
476
477 return size;
478}
479
480static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
481{
482 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
483 struct nlattr *linkinfo, *data;
484 int err = -EMSGSIZE;
485
486 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
487 if (linkinfo == NULL)
488 goto out;
489
490 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
491 goto err_cancel_link;
492 if (ops->fill_xstats) {
493 err = ops->fill_xstats(skb, dev);
494 if (err < 0)
495 goto err_cancel_link;
496 }
497 if (ops->fill_info) {
498 data = nla_nest_start(skb, IFLA_INFO_DATA);
499 if (data == NULL)
500 goto err_cancel_link;
501 err = ops->fill_info(skb, dev);
502 if (err < 0)
503 goto err_cancel_data;
504 nla_nest_end(skb, data);
505 }
506
507 nla_nest_end(skb, linkinfo);
508 return 0;
509
510err_cancel_data:
511 nla_nest_cancel(skb, data);
512err_cancel_link:
513 nla_nest_cancel(skb, linkinfo);
514out:
515 return err;
516}
517
518static const int rtm_min[RTM_NR_FAMILIES] =
519{
520 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
521 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
522 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
523 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
524 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
525 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
526 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
527 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
528 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
529 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
530};
531
532static const int rta_max[RTM_NR_FAMILIES] =
533{
534 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
535 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
536 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
537 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
538 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
539 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
540 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
541 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
542};
543
544void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
545{
546 struct rtattr *rta;
547 int size = RTA_LENGTH(attrlen);
548
549 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
550 rta->rta_type = attrtype;
551 rta->rta_len = size;
552 memcpy(RTA_DATA(rta), data, attrlen);
553 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
554}
555EXPORT_SYMBOL(__rta_fill);
556
557int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
558{
559 struct sock *rtnl = net->rtnl;
560 int err = 0;
561
562 NETLINK_CB(skb).dst_group = group;
563 if (echo)
564 atomic_inc(&skb->users);
565 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
566 if (echo)
567 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
568 return err;
569}
570
571int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
572{
573 struct sock *rtnl = net->rtnl;
574
575 return nlmsg_unicast(rtnl, skb, pid);
576}
577EXPORT_SYMBOL(rtnl_unicast);
578
579void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
580 struct nlmsghdr *nlh, gfp_t flags)
581{
582 struct sock *rtnl = net->rtnl;
583 int report = 0;
584
585 if (nlh)
586 report = nlmsg_report(nlh);
587
588 nlmsg_notify(rtnl, skb, pid, group, report, flags);
589}
590EXPORT_SYMBOL(rtnl_notify);
591
592void rtnl_set_sk_err(struct net *net, u32 group, int error)
593{
594 struct sock *rtnl = net->rtnl;
595
596 netlink_set_err(rtnl, 0, group, error);
597}
598EXPORT_SYMBOL(rtnl_set_sk_err);
599
600int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
601{
602 struct nlattr *mx;
603 int i, valid = 0;
604
605 mx = nla_nest_start(skb, RTA_METRICS);
606 if (mx == NULL)
607 return -ENOBUFS;
608
609 for (i = 0; i < RTAX_MAX; i++) {
610 if (metrics[i]) {
611 valid++;
612 if (nla_put_u32(skb, i+1, metrics[i]))
613 goto nla_put_failure;
614 }
615 }
616
617 if (!valid) {
618 nla_nest_cancel(skb, mx);
619 return 0;
620 }
621
622 return nla_nest_end(skb, mx);
623
624nla_put_failure:
625 nla_nest_cancel(skb, mx);
626 return -EMSGSIZE;
627}
628EXPORT_SYMBOL(rtnetlink_put_metrics);
629
630int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
631 u32 ts, u32 tsage, long expires, u32 error)
632{
633 struct rta_cacheinfo ci = {
634 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
635 .rta_used = dst->__use,
636 .rta_clntref = atomic_read(&(dst->__refcnt)),
637 .rta_error = error,
638 .rta_id = id,
639 .rta_ts = ts,
640 .rta_tsage = tsage,
641 };
642
643 if (expires)
644 ci.rta_expires = jiffies_to_clock_t(expires);
645
646 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
647}
648EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
649
650static void set_operstate(struct net_device *dev, unsigned char transition)
651{
652 unsigned char operstate = dev->operstate;
653
654 switch (transition) {
655 case IF_OPER_UP:
656 if ((operstate == IF_OPER_DORMANT ||
657 operstate == IF_OPER_UNKNOWN) &&
658 !netif_dormant(dev))
659 operstate = IF_OPER_UP;
660 break;
661
662 case IF_OPER_DORMANT:
663 if (operstate == IF_OPER_UP ||
664 operstate == IF_OPER_UNKNOWN)
665 operstate = IF_OPER_DORMANT;
666 break;
667 }
668
669 if (dev->operstate != operstate) {
670 write_lock_bh(&dev_base_lock);
671 dev->operstate = operstate;
672 write_unlock_bh(&dev_base_lock);
673 netdev_state_change(dev);
674 }
675}
676
677static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
678{
679 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
680 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
681}
682
683static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
684 const struct ifinfomsg *ifm)
685{
686 unsigned int flags = ifm->ifi_flags;
687
688 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
689 if (ifm->ifi_change)
690 flags = (flags & ifm->ifi_change) |
691 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
692
693 return flags;
694}
695
696static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
697 const struct rtnl_link_stats64 *b)
698{
699 a->rx_packets = b->rx_packets;
700 a->tx_packets = b->tx_packets;
701 a->rx_bytes = b->rx_bytes;
702 a->tx_bytes = b->tx_bytes;
703 a->rx_errors = b->rx_errors;
704 a->tx_errors = b->tx_errors;
705 a->rx_dropped = b->rx_dropped;
706 a->tx_dropped = b->tx_dropped;
707
708 a->multicast = b->multicast;
709 a->collisions = b->collisions;
710
711 a->rx_length_errors = b->rx_length_errors;
712 a->rx_over_errors = b->rx_over_errors;
713 a->rx_crc_errors = b->rx_crc_errors;
714 a->rx_frame_errors = b->rx_frame_errors;
715 a->rx_fifo_errors = b->rx_fifo_errors;
716 a->rx_missed_errors = b->rx_missed_errors;
717
718 a->tx_aborted_errors = b->tx_aborted_errors;
719 a->tx_carrier_errors = b->tx_carrier_errors;
720 a->tx_fifo_errors = b->tx_fifo_errors;
721 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
722 a->tx_window_errors = b->tx_window_errors;
723
724 a->rx_compressed = b->rx_compressed;
725 a->tx_compressed = b->tx_compressed;
726}
727
728static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
729{
730 memcpy(v, b, sizeof(*b));
731}
732
733/* All VF info */
734static inline int rtnl_vfinfo_size(const struct net_device *dev,
735 u32 ext_filter_mask)
736{
737 if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
738 (ext_filter_mask & RTEXT_FILTER_VF)) {
739 int num_vfs = dev_num_vf(dev->dev.parent);
740 size_t size = nla_total_size(sizeof(struct nlattr));
741 size += nla_total_size(num_vfs * sizeof(struct nlattr));
742 size += num_vfs *
743 (nla_total_size(sizeof(struct ifla_vf_mac)) +
744 nla_total_size(sizeof(struct ifla_vf_vlan)) +
745 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
746 nla_total_size(sizeof(struct ifla_vf_spoofchk)));
747 return size;
748 } else
749 return 0;
750}
751
752static size_t rtnl_port_size(const struct net_device *dev)
753{
754 size_t port_size = nla_total_size(4) /* PORT_VF */
755 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
756 + nla_total_size(sizeof(struct ifla_port_vsi))
757 /* PORT_VSI_TYPE */
758 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
759 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
760 + nla_total_size(1) /* PROT_VDP_REQUEST */
761 + nla_total_size(2); /* PORT_VDP_RESPONSE */
762 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
763 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
764 + port_size;
765 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
766 + port_size;
767
768 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
769 return 0;
770 if (dev_num_vf(dev->dev.parent))
771 return port_self_size + vf_ports_size +
772 vf_port_size * dev_num_vf(dev->dev.parent);
773 else
774 return port_self_size;
775}
776
777static noinline size_t if_nlmsg_size(const struct net_device *dev,
778 u32 ext_filter_mask)
779{
780 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
781 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
782 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
783 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
784 + nla_total_size(sizeof(struct rtnl_link_ifmap))
785 + nla_total_size(sizeof(struct rtnl_link_stats))
786 + nla_total_size(sizeof(struct rtnl_link_stats64))
787 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
788 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
789 + nla_total_size(4) /* IFLA_TXQLEN */
790 + nla_total_size(4) /* IFLA_WEIGHT */
791 + nla_total_size(4) /* IFLA_MTU */
792 + nla_total_size(4) /* IFLA_LINK */
793 + nla_total_size(4) /* IFLA_MASTER */
794 + nla_total_size(4) /* IFLA_PROMISCUITY */
795 + nla_total_size(1) /* IFLA_OPERSTATE */
796 + nla_total_size(1) /* IFLA_LINKMODE */
797 + nla_total_size(ext_filter_mask
798 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
799 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
800 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
801 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
802 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
803}
804
805static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
806{
807 struct nlattr *vf_ports;
808 struct nlattr *vf_port;
809 int vf;
810 int err;
811
812 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
813 if (!vf_ports)
814 return -EMSGSIZE;
815
816 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
817 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
818 if (!vf_port)
819 goto nla_put_failure;
820 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
821 goto nla_put_failure;
822 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
823 if (err == -EMSGSIZE)
824 goto nla_put_failure;
825 if (err) {
826 nla_nest_cancel(skb, vf_port);
827 continue;
828 }
829 nla_nest_end(skb, vf_port);
830 }
831
832 nla_nest_end(skb, vf_ports);
833
834 return 0;
835
836nla_put_failure:
837 nla_nest_cancel(skb, vf_ports);
838 return -EMSGSIZE;
839}
840
841static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
842{
843 struct nlattr *port_self;
844 int err;
845
846 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
847 if (!port_self)
848 return -EMSGSIZE;
849
850 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
851 if (err) {
852 nla_nest_cancel(skb, port_self);
853 return (err == -EMSGSIZE) ? err : 0;
854 }
855
856 nla_nest_end(skb, port_self);
857
858 return 0;
859}
860
861static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
862{
863 int err;
864
865 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
866 return 0;
867
868 err = rtnl_port_self_fill(skb, dev);
869 if (err)
870 return err;
871
872 if (dev_num_vf(dev->dev.parent)) {
873 err = rtnl_vf_ports_fill(skb, dev);
874 if (err)
875 return err;
876 }
877
878 return 0;
879}
880
881static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
882 int type, u32 pid, u32 seq, u32 change,
883 unsigned int flags, u32 ext_filter_mask)
884{
885 struct ifinfomsg *ifm;
886 struct nlmsghdr *nlh;
887 struct rtnl_link_stats64 temp;
888 const struct rtnl_link_stats64 *stats;
889 struct nlattr *attr, *af_spec;
890 struct rtnl_af_ops *af_ops;
891
892 ASSERT_RTNL();
893 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
894 if (nlh == NULL)
895 return -EMSGSIZE;
896
897 ifm = nlmsg_data(nlh);
898 ifm->ifi_family = AF_UNSPEC;
899 ifm->__ifi_pad = 0;
900 ifm->ifi_type = dev->type;
901 ifm->ifi_index = dev->ifindex;
902 ifm->ifi_flags = dev_get_flags(dev);
903 ifm->ifi_change = change;
904
905 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
906 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
907 nla_put_u8(skb, IFLA_OPERSTATE,
908 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
909 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
910 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
911 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
912 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
913 (dev->ifindex != dev->iflink &&
914 nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
915 (dev->master &&
916 nla_put_u32(skb, IFLA_MASTER, dev->master->ifindex)) ||
917 (dev->qdisc &&
918 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
919 (dev->ifalias &&
920 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)))
921 goto nla_put_failure;
922
923 if (1) {
924 struct rtnl_link_ifmap map = {
925 .mem_start = dev->mem_start,
926 .mem_end = dev->mem_end,
927 .base_addr = dev->base_addr,
928 .irq = dev->irq,
929 .dma = dev->dma,
930 .port = dev->if_port,
931 };
932 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
933 goto nla_put_failure;
934 }
935
936 if (dev->addr_len) {
937 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
938 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
939 goto nla_put_failure;
940 }
941
942 attr = nla_reserve(skb, IFLA_STATS,
943 sizeof(struct rtnl_link_stats));
944 if (attr == NULL)
945 goto nla_put_failure;
946
947 stats = dev_get_stats(dev, &temp);
948 copy_rtnl_link_stats(nla_data(attr), stats);
949
950 attr = nla_reserve(skb, IFLA_STATS64,
951 sizeof(struct rtnl_link_stats64));
952 if (attr == NULL)
953 goto nla_put_failure;
954 copy_rtnl_link_stats64(nla_data(attr), stats);
955
956 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
957 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
958 goto nla_put_failure;
959
960 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
961 && (ext_filter_mask & RTEXT_FILTER_VF)) {
962 int i;
963
964 struct nlattr *vfinfo, *vf;
965 int num_vfs = dev_num_vf(dev->dev.parent);
966
967 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
968 if (!vfinfo)
969 goto nla_put_failure;
970 for (i = 0; i < num_vfs; i++) {
971 struct ifla_vf_info ivi;
972 struct ifla_vf_mac vf_mac;
973 struct ifla_vf_vlan vf_vlan;
974 struct ifla_vf_tx_rate vf_tx_rate;
975 struct ifla_vf_spoofchk vf_spoofchk;
976
977 /*
978 * Not all SR-IOV capable drivers support the
979 * spoofcheck query. Preset to -1 so the user
980 * space tool can detect that the driver didn't
981 * report anything.
982 */
983 ivi.spoofchk = -1;
984 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
985 break;
986 vf_mac.vf =
987 vf_vlan.vf =
988 vf_tx_rate.vf =
989 vf_spoofchk.vf = ivi.vf;
990
991 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
992 vf_vlan.vlan = ivi.vlan;
993 vf_vlan.qos = ivi.qos;
994 vf_tx_rate.rate = ivi.tx_rate;
995 vf_spoofchk.setting = ivi.spoofchk;
996 vf = nla_nest_start(skb, IFLA_VF_INFO);
997 if (!vf) {
998 nla_nest_cancel(skb, vfinfo);
999 goto nla_put_failure;
1000 }
1001 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1002 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1003 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1004 &vf_tx_rate) ||
1005 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1006 &vf_spoofchk))
1007 goto nla_put_failure;
1008 nla_nest_end(skb, vf);
1009 }
1010 nla_nest_end(skb, vfinfo);
1011 }
1012
1013 if (rtnl_port_fill(skb, dev))
1014 goto nla_put_failure;
1015
1016 if (dev->rtnl_link_ops) {
1017 if (rtnl_link_fill(skb, dev) < 0)
1018 goto nla_put_failure;
1019 }
1020
1021 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1022 goto nla_put_failure;
1023
1024 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1025 if (af_ops->fill_link_af) {
1026 struct nlattr *af;
1027 int err;
1028
1029 if (!(af = nla_nest_start(skb, af_ops->family)))
1030 goto nla_put_failure;
1031
1032 err = af_ops->fill_link_af(skb, dev);
1033
1034 /*
1035 * Caller may return ENODATA to indicate that there
1036 * was no data to be dumped. This is not an error, it
1037 * means we should trim the attribute header and
1038 * continue.
1039 */
1040 if (err == -ENODATA)
1041 nla_nest_cancel(skb, af);
1042 else if (err < 0)
1043 goto nla_put_failure;
1044
1045 nla_nest_end(skb, af);
1046 }
1047 }
1048
1049 nla_nest_end(skb, af_spec);
1050
1051 return nlmsg_end(skb, nlh);
1052
1053nla_put_failure:
1054 nlmsg_cancel(skb, nlh);
1055 return -EMSGSIZE;
1056}
1057
1058static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1059{
1060 struct net *net = sock_net(skb->sk);
1061 int h, s_h;
1062 int idx = 0, s_idx;
1063 struct net_device *dev;
1064 struct hlist_head *head;
1065 struct hlist_node *node;
1066 struct nlattr *tb[IFLA_MAX+1];
1067 u32 ext_filter_mask = 0;
1068
1069 s_h = cb->args[0];
1070 s_idx = cb->args[1];
1071
1072 rcu_read_lock();
1073 cb->seq = net->dev_base_seq;
1074
1075 if (nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1076 ifla_policy) >= 0) {
1077
1078 if (tb[IFLA_EXT_MASK])
1079 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1080 }
1081
1082 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1083 idx = 0;
1084 head = &net->dev_index_head[h];
1085 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1086 if (idx < s_idx)
1087 goto cont;
1088 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1089 NETLINK_CB(cb->skb).pid,
1090 cb->nlh->nlmsg_seq, 0,
1091 NLM_F_MULTI,
1092 ext_filter_mask) <= 0)
1093 goto out;
1094
1095 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1096cont:
1097 idx++;
1098 }
1099 }
1100out:
1101 rcu_read_unlock();
1102 cb->args[1] = idx;
1103 cb->args[0] = h;
1104
1105 return skb->len;
1106}
1107
1108const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1109 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1110 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1111 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1112 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1113 [IFLA_MTU] = { .type = NLA_U32 },
1114 [IFLA_LINK] = { .type = NLA_U32 },
1115 [IFLA_MASTER] = { .type = NLA_U32 },
1116 [IFLA_TXQLEN] = { .type = NLA_U32 },
1117 [IFLA_WEIGHT] = { .type = NLA_U32 },
1118 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1119 [IFLA_LINKMODE] = { .type = NLA_U8 },
1120 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1121 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1122 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1123 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1124 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1125 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1126 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1127 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1128 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1129 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1130};
1131EXPORT_SYMBOL(ifla_policy);
1132
1133static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1134 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1135 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1136};
1137
1138static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1139 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1140};
1141
1142static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1143 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1144 .len = sizeof(struct ifla_vf_mac) },
1145 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1146 .len = sizeof(struct ifla_vf_vlan) },
1147 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1148 .len = sizeof(struct ifla_vf_tx_rate) },
1149 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY,
1150 .len = sizeof(struct ifla_vf_spoofchk) },
1151};
1152
1153static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1154 [IFLA_PORT_VF] = { .type = NLA_U32 },
1155 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1156 .len = PORT_PROFILE_MAX },
1157 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1158 .len = sizeof(struct ifla_port_vsi)},
1159 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1160 .len = PORT_UUID_MAX },
1161 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1162 .len = PORT_UUID_MAX },
1163 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1164 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1165};
1166
1167struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1168{
1169 struct net *net;
1170 /* Examine the link attributes and figure out which
1171 * network namespace we are talking about.
1172 */
1173 if (tb[IFLA_NET_NS_PID])
1174 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1175 else if (tb[IFLA_NET_NS_FD])
1176 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1177 else
1178 net = get_net(src_net);
1179 return net;
1180}
1181EXPORT_SYMBOL(rtnl_link_get_net);
1182
1183static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1184{
1185 if (dev) {
1186 if (tb[IFLA_ADDRESS] &&
1187 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1188 return -EINVAL;
1189
1190 if (tb[IFLA_BROADCAST] &&
1191 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1192 return -EINVAL;
1193 }
1194
1195 if (tb[IFLA_AF_SPEC]) {
1196 struct nlattr *af;
1197 int rem, err;
1198
1199 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1200 const struct rtnl_af_ops *af_ops;
1201
1202 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1203 return -EAFNOSUPPORT;
1204
1205 if (!af_ops->set_link_af)
1206 return -EOPNOTSUPP;
1207
1208 if (af_ops->validate_link_af) {
1209 err = af_ops->validate_link_af(dev, af);
1210 if (err < 0)
1211 return err;
1212 }
1213 }
1214 }
1215
1216 return 0;
1217}
1218
1219static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1220{
1221 int rem, err = -EINVAL;
1222 struct nlattr *vf;
1223 const struct net_device_ops *ops = dev->netdev_ops;
1224
1225 nla_for_each_nested(vf, attr, rem) {
1226 switch (nla_type(vf)) {
1227 case IFLA_VF_MAC: {
1228 struct ifla_vf_mac *ivm;
1229 ivm = nla_data(vf);
1230 err = -EOPNOTSUPP;
1231 if (ops->ndo_set_vf_mac)
1232 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1233 ivm->mac);
1234 break;
1235 }
1236 case IFLA_VF_VLAN: {
1237 struct ifla_vf_vlan *ivv;
1238 ivv = nla_data(vf);
1239 err = -EOPNOTSUPP;
1240 if (ops->ndo_set_vf_vlan)
1241 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1242 ivv->vlan,
1243 ivv->qos);
1244 break;
1245 }
1246 case IFLA_VF_TX_RATE: {
1247 struct ifla_vf_tx_rate *ivt;
1248 ivt = nla_data(vf);
1249 err = -EOPNOTSUPP;
1250 if (ops->ndo_set_vf_tx_rate)
1251 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1252 ivt->rate);
1253 break;
1254 }
1255 case IFLA_VF_SPOOFCHK: {
1256 struct ifla_vf_spoofchk *ivs;
1257 ivs = nla_data(vf);
1258 err = -EOPNOTSUPP;
1259 if (ops->ndo_set_vf_spoofchk)
1260 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1261 ivs->setting);
1262 break;
1263 }
1264 default:
1265 err = -EINVAL;
1266 break;
1267 }
1268 if (err)
1269 break;
1270 }
1271 return err;
1272}
1273
1274static int do_set_master(struct net_device *dev, int ifindex)
1275{
1276 struct net_device *master_dev;
1277 const struct net_device_ops *ops;
1278 int err;
1279
1280 if (dev->master) {
1281 if (dev->master->ifindex == ifindex)
1282 return 0;
1283 ops = dev->master->netdev_ops;
1284 if (ops->ndo_del_slave) {
1285 err = ops->ndo_del_slave(dev->master, dev);
1286 if (err)
1287 return err;
1288 } else {
1289 return -EOPNOTSUPP;
1290 }
1291 }
1292
1293 if (ifindex) {
1294 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1295 if (!master_dev)
1296 return -EINVAL;
1297 ops = master_dev->netdev_ops;
1298 if (ops->ndo_add_slave) {
1299 err = ops->ndo_add_slave(master_dev, dev);
1300 if (err)
1301 return err;
1302 } else {
1303 return -EOPNOTSUPP;
1304 }
1305 }
1306 return 0;
1307}
1308
1309static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1310 struct nlattr **tb, char *ifname, int modified)
1311{
1312 const struct net_device_ops *ops = dev->netdev_ops;
1313 int send_addr_notify = 0;
1314 int err;
1315
1316 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1317 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1318 if (IS_ERR(net)) {
1319 err = PTR_ERR(net);
1320 goto errout;
1321 }
1322 err = dev_change_net_namespace(dev, net, ifname);
1323 put_net(net);
1324 if (err)
1325 goto errout;
1326 modified = 1;
1327 }
1328
1329 if (tb[IFLA_MAP]) {
1330 struct rtnl_link_ifmap *u_map;
1331 struct ifmap k_map;
1332
1333 if (!ops->ndo_set_config) {
1334 err = -EOPNOTSUPP;
1335 goto errout;
1336 }
1337
1338 if (!netif_device_present(dev)) {
1339 err = -ENODEV;
1340 goto errout;
1341 }
1342
1343 u_map = nla_data(tb[IFLA_MAP]);
1344 k_map.mem_start = (unsigned long) u_map->mem_start;
1345 k_map.mem_end = (unsigned long) u_map->mem_end;
1346 k_map.base_addr = (unsigned short) u_map->base_addr;
1347 k_map.irq = (unsigned char) u_map->irq;
1348 k_map.dma = (unsigned char) u_map->dma;
1349 k_map.port = (unsigned char) u_map->port;
1350
1351 err = ops->ndo_set_config(dev, &k_map);
1352 if (err < 0)
1353 goto errout;
1354
1355 modified = 1;
1356 }
1357
1358 if (tb[IFLA_ADDRESS]) {
1359 struct sockaddr *sa;
1360 int len;
1361
1362 if (!ops->ndo_set_mac_address) {
1363 err = -EOPNOTSUPP;
1364 goto errout;
1365 }
1366
1367 if (!netif_device_present(dev)) {
1368 err = -ENODEV;
1369 goto errout;
1370 }
1371
1372 len = sizeof(sa_family_t) + dev->addr_len;
1373 sa = kmalloc(len, GFP_KERNEL);
1374 if (!sa) {
1375 err = -ENOMEM;
1376 goto errout;
1377 }
1378 sa->sa_family = dev->type;
1379 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1380 dev->addr_len);
1381 err = ops->ndo_set_mac_address(dev, sa);
1382 kfree(sa);
1383 if (err)
1384 goto errout;
1385 send_addr_notify = 1;
1386 modified = 1;
1387 add_device_randomness(dev->dev_addr, dev->addr_len);
1388 }
1389
1390 if (tb[IFLA_MTU]) {
1391 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1392 if (err < 0)
1393 goto errout;
1394 modified = 1;
1395 }
1396
1397 if (tb[IFLA_GROUP]) {
1398 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1399 modified = 1;
1400 }
1401
1402 /*
1403 * Interface selected by interface index but interface
1404 * name provided implies that a name change has been
1405 * requested.
1406 */
1407 if (ifm->ifi_index > 0 && ifname[0]) {
1408 err = dev_change_name(dev, ifname);
1409 if (err < 0)
1410 goto errout;
1411 modified = 1;
1412 }
1413
1414 if (tb[IFLA_IFALIAS]) {
1415 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1416 nla_len(tb[IFLA_IFALIAS]));
1417 if (err < 0)
1418 goto errout;
1419 modified = 1;
1420 }
1421
1422 if (tb[IFLA_BROADCAST]) {
1423 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1424 send_addr_notify = 1;
1425 }
1426
1427 if (ifm->ifi_flags || ifm->ifi_change) {
1428 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1429 if (err < 0)
1430 goto errout;
1431 }
1432
1433 if (tb[IFLA_MASTER]) {
1434 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1435 if (err)
1436 goto errout;
1437 modified = 1;
1438 }
1439
1440 if (tb[IFLA_TXQLEN])
1441 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1442
1443 if (tb[IFLA_OPERSTATE])
1444 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1445
1446 if (tb[IFLA_LINKMODE]) {
1447 write_lock_bh(&dev_base_lock);
1448 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1449 write_unlock_bh(&dev_base_lock);
1450 }
1451
1452 if (tb[IFLA_VFINFO_LIST]) {
1453 struct nlattr *attr;
1454 int rem;
1455 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1456 if (nla_type(attr) != IFLA_VF_INFO) {
1457 err = -EINVAL;
1458 goto errout;
1459 }
1460 err = do_setvfinfo(dev, attr);
1461 if (err < 0)
1462 goto errout;
1463 modified = 1;
1464 }
1465 }
1466 err = 0;
1467
1468 if (tb[IFLA_VF_PORTS]) {
1469 struct nlattr *port[IFLA_PORT_MAX+1];
1470 struct nlattr *attr;
1471 int vf;
1472 int rem;
1473
1474 err = -EOPNOTSUPP;
1475 if (!ops->ndo_set_vf_port)
1476 goto errout;
1477
1478 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1479 if (nla_type(attr) != IFLA_VF_PORT)
1480 continue;
1481 err = nla_parse_nested(port, IFLA_PORT_MAX,
1482 attr, ifla_port_policy);
1483 if (err < 0)
1484 goto errout;
1485 if (!port[IFLA_PORT_VF]) {
1486 err = -EOPNOTSUPP;
1487 goto errout;
1488 }
1489 vf = nla_get_u32(port[IFLA_PORT_VF]);
1490 err = ops->ndo_set_vf_port(dev, vf, port);
1491 if (err < 0)
1492 goto errout;
1493 modified = 1;
1494 }
1495 }
1496 err = 0;
1497
1498 if (tb[IFLA_PORT_SELF]) {
1499 struct nlattr *port[IFLA_PORT_MAX+1];
1500
1501 err = nla_parse_nested(port, IFLA_PORT_MAX,
1502 tb[IFLA_PORT_SELF], ifla_port_policy);
1503 if (err < 0)
1504 goto errout;
1505
1506 err = -EOPNOTSUPP;
1507 if (ops->ndo_set_vf_port)
1508 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1509 if (err < 0)
1510 goto errout;
1511 modified = 1;
1512 }
1513
1514 if (tb[IFLA_AF_SPEC]) {
1515 struct nlattr *af;
1516 int rem;
1517
1518 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1519 const struct rtnl_af_ops *af_ops;
1520
1521 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1522 BUG();
1523
1524 err = af_ops->set_link_af(dev, af);
1525 if (err < 0)
1526 goto errout;
1527
1528 modified = 1;
1529 }
1530 }
1531 err = 0;
1532
1533errout:
1534 if (err < 0 && modified)
1535 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",
1536 dev->name);
1537
1538 if (send_addr_notify)
1539 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1540
1541 return err;
1542}
1543
1544static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1545{
1546 struct net *net = sock_net(skb->sk);
1547 struct ifinfomsg *ifm;
1548 struct net_device *dev;
1549 int err;
1550 struct nlattr *tb[IFLA_MAX+1];
1551 char ifname[IFNAMSIZ];
1552
1553 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1554 if (err < 0)
1555 goto errout;
1556
1557 if (tb[IFLA_IFNAME])
1558 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1559 else
1560 ifname[0] = '\0';
1561
1562 err = -EINVAL;
1563 ifm = nlmsg_data(nlh);
1564 if (ifm->ifi_index > 0)
1565 dev = __dev_get_by_index(net, ifm->ifi_index);
1566 else if (tb[IFLA_IFNAME])
1567 dev = __dev_get_by_name(net, ifname);
1568 else
1569 goto errout;
1570
1571 if (dev == NULL) {
1572 err = -ENODEV;
1573 goto errout;
1574 }
1575
1576 err = validate_linkmsg(dev, tb);
1577 if (err < 0)
1578 goto errout;
1579
1580 err = do_setlink(dev, ifm, tb, ifname, 0);
1581errout:
1582 return err;
1583}
1584
1585static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1586{
1587 struct net *net = sock_net(skb->sk);
1588 const struct rtnl_link_ops *ops;
1589 struct net_device *dev;
1590 struct ifinfomsg *ifm;
1591 char ifname[IFNAMSIZ];
1592 struct nlattr *tb[IFLA_MAX+1];
1593 int err;
1594 LIST_HEAD(list_kill);
1595
1596 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1597 if (err < 0)
1598 return err;
1599
1600 if (tb[IFLA_IFNAME])
1601 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1602
1603 ifm = nlmsg_data(nlh);
1604 if (ifm->ifi_index > 0)
1605 dev = __dev_get_by_index(net, ifm->ifi_index);
1606 else if (tb[IFLA_IFNAME])
1607 dev = __dev_get_by_name(net, ifname);
1608 else
1609 return -EINVAL;
1610
1611 if (!dev)
1612 return -ENODEV;
1613
1614 ops = dev->rtnl_link_ops;
1615 if (!ops)
1616 return -EOPNOTSUPP;
1617
1618 ops->dellink(dev, &list_kill);
1619 unregister_netdevice_many(&list_kill);
1620 list_del(&list_kill);
1621 return 0;
1622}
1623
1624int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1625{
1626 unsigned int old_flags;
1627 int err;
1628
1629 old_flags = dev->flags;
1630 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1631 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1632 if (err < 0)
1633 return err;
1634 }
1635
1636 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1637 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1638
1639 __dev_notify_flags(dev, old_flags);
1640 return 0;
1641}
1642EXPORT_SYMBOL(rtnl_configure_link);
1643
1644struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1645 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1646{
1647 int err;
1648 struct net_device *dev;
1649 unsigned int num_queues = 1;
1650
1651 if (ops->get_tx_queues) {
1652 err = ops->get_tx_queues(src_net, tb);
1653 if (err < 0)
1654 goto err;
1655 num_queues = err;
1656 }
1657
1658 err = -ENOMEM;
1659 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1660 if (!dev)
1661 goto err;
1662
1663 dev_net_set(dev, net);
1664 dev->rtnl_link_ops = ops;
1665 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1666
1667 if (tb[IFLA_MTU])
1668 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1669 if (tb[IFLA_ADDRESS])
1670 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1671 nla_len(tb[IFLA_ADDRESS]));
1672 if (tb[IFLA_BROADCAST])
1673 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1674 nla_len(tb[IFLA_BROADCAST]));
1675 if (tb[IFLA_TXQLEN])
1676 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1677 if (tb[IFLA_OPERSTATE])
1678 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1679 if (tb[IFLA_LINKMODE])
1680 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1681 if (tb[IFLA_GROUP])
1682 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1683
1684 return dev;
1685
1686err:
1687 return ERR_PTR(err);
1688}
1689EXPORT_SYMBOL(rtnl_create_link);
1690
1691static int rtnl_group_changelink(struct net *net, int group,
1692 struct ifinfomsg *ifm,
1693 struct nlattr **tb)
1694{
1695 struct net_device *dev;
1696 int err;
1697
1698 for_each_netdev(net, dev) {
1699 if (dev->group == group) {
1700 err = do_setlink(dev, ifm, tb, NULL, 0);
1701 if (err < 0)
1702 return err;
1703 }
1704 }
1705
1706 return 0;
1707}
1708
1709static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1710{
1711 struct net *net = sock_net(skb->sk);
1712 const struct rtnl_link_ops *ops;
1713 struct net_device *dev;
1714 struct ifinfomsg *ifm;
1715 char kind[MODULE_NAME_LEN];
1716 char ifname[IFNAMSIZ];
1717 struct nlattr *tb[IFLA_MAX+1];
1718 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1719 int err;
1720
1721#ifdef CONFIG_MODULES
1722replay:
1723#endif
1724 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1725 if (err < 0)
1726 return err;
1727
1728 if (tb[IFLA_IFNAME])
1729 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1730 else
1731 ifname[0] = '\0';
1732
1733 ifm = nlmsg_data(nlh);
1734 if (ifm->ifi_index > 0)
1735 dev = __dev_get_by_index(net, ifm->ifi_index);
1736 else {
1737 if (ifname[0])
1738 dev = __dev_get_by_name(net, ifname);
1739 else
1740 dev = NULL;
1741 }
1742
1743 err = validate_linkmsg(dev, tb);
1744 if (err < 0)
1745 return err;
1746
1747 if (tb[IFLA_LINKINFO]) {
1748 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1749 tb[IFLA_LINKINFO], ifla_info_policy);
1750 if (err < 0)
1751 return err;
1752 } else
1753 memset(linkinfo, 0, sizeof(linkinfo));
1754
1755 if (linkinfo[IFLA_INFO_KIND]) {
1756 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1757 ops = rtnl_link_ops_get(kind);
1758 } else {
1759 kind[0] = '\0';
1760 ops = NULL;
1761 }
1762
1763 if (1) {
1764 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1765 struct net *dest_net;
1766
1767 if (ops) {
1768 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1769 err = nla_parse_nested(attr, ops->maxtype,
1770 linkinfo[IFLA_INFO_DATA],
1771 ops->policy);
1772 if (err < 0)
1773 return err;
1774 data = attr;
1775 }
1776 if (ops->validate) {
1777 err = ops->validate(tb, data);
1778 if (err < 0)
1779 return err;
1780 }
1781 }
1782
1783 if (dev) {
1784 int modified = 0;
1785
1786 if (nlh->nlmsg_flags & NLM_F_EXCL)
1787 return -EEXIST;
1788 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1789 return -EOPNOTSUPP;
1790
1791 if (linkinfo[IFLA_INFO_DATA]) {
1792 if (!ops || ops != dev->rtnl_link_ops ||
1793 !ops->changelink)
1794 return -EOPNOTSUPP;
1795
1796 err = ops->changelink(dev, tb, data);
1797 if (err < 0)
1798 return err;
1799 modified = 1;
1800 }
1801
1802 return do_setlink(dev, ifm, tb, ifname, modified);
1803 }
1804
1805 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1806 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1807 return rtnl_group_changelink(net,
1808 nla_get_u32(tb[IFLA_GROUP]),
1809 ifm, tb);
1810 return -ENODEV;
1811 }
1812
1813 if (ifm->ifi_index)
1814 return -EOPNOTSUPP;
1815 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1816 return -EOPNOTSUPP;
1817
1818 if (!ops) {
1819#ifdef CONFIG_MODULES
1820 if (kind[0]) {
1821 __rtnl_unlock();
1822 request_module("rtnl-link-%s", kind);
1823 rtnl_lock();
1824 ops = rtnl_link_ops_get(kind);
1825 if (ops)
1826 goto replay;
1827 }
1828#endif
1829 return -EOPNOTSUPP;
1830 }
1831
1832 if (!ifname[0])
1833 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1834
1835 dest_net = rtnl_link_get_net(net, tb);
1836 if (IS_ERR(dest_net))
1837 return PTR_ERR(dest_net);
1838
1839 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1840
1841 if (IS_ERR(dev))
1842 err = PTR_ERR(dev);
1843 else if (ops->newlink)
1844 err = ops->newlink(net, dev, tb, data);
1845 else
1846 err = register_netdevice(dev);
1847
1848 if (err < 0 && !IS_ERR(dev))
1849 free_netdev(dev);
1850 if (err < 0)
1851 goto out;
1852
1853 err = rtnl_configure_link(dev, ifm);
1854 if (err < 0)
1855 unregister_netdevice(dev);
1856out:
1857 put_net(dest_net);
1858 return err;
1859 }
1860}
1861
1862static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1863{
1864 struct net *net = sock_net(skb->sk);
1865 struct ifinfomsg *ifm;
1866 char ifname[IFNAMSIZ];
1867 struct nlattr *tb[IFLA_MAX+1];
1868 struct net_device *dev = NULL;
1869 struct sk_buff *nskb;
1870 int err;
1871 u32 ext_filter_mask = 0;
1872
1873 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1874 if (err < 0)
1875 return err;
1876
1877 if (tb[IFLA_IFNAME])
1878 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1879
1880 if (tb[IFLA_EXT_MASK])
1881 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1882
1883 ifm = nlmsg_data(nlh);
1884 if (ifm->ifi_index > 0)
1885 dev = __dev_get_by_index(net, ifm->ifi_index);
1886 else if (tb[IFLA_IFNAME])
1887 dev = __dev_get_by_name(net, ifname);
1888 else
1889 return -EINVAL;
1890
1891 if (dev == NULL)
1892 return -ENODEV;
1893
1894 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1895 if (nskb == NULL)
1896 return -ENOBUFS;
1897
1898 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1899 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1900 if (err < 0) {
1901 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1902 WARN_ON(err == -EMSGSIZE);
1903 kfree_skb(nskb);
1904 } else
1905 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1906
1907 return err;
1908}
1909
1910static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1911{
1912 struct net *net = sock_net(skb->sk);
1913 struct net_device *dev;
1914 struct nlattr *tb[IFLA_MAX+1];
1915 u32 ext_filter_mask = 0;
1916 u16 min_ifinfo_dump_size = 0;
1917
1918 if (nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1919 ifla_policy) >= 0) {
1920 if (tb[IFLA_EXT_MASK])
1921 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1922 }
1923
1924 if (!ext_filter_mask)
1925 return NLMSG_GOODSIZE;
1926 /*
1927 * traverse the list of net devices and compute the minimum
1928 * buffer size based upon the filter mask.
1929 */
1930 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1931 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1932 if_nlmsg_size(dev,
1933 ext_filter_mask));
1934 }
1935
1936 return min_ifinfo_dump_size;
1937}
1938
1939static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1940{
1941 int idx;
1942 int s_idx = cb->family;
1943
1944 if (s_idx == 0)
1945 s_idx = 1;
1946 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1947 int type = cb->nlh->nlmsg_type-RTM_BASE;
1948 if (idx < s_idx || idx == PF_PACKET)
1949 continue;
1950 if (rtnl_msg_handlers[idx] == NULL ||
1951 rtnl_msg_handlers[idx][type].dumpit == NULL)
1952 continue;
1953 if (idx > s_idx)
1954 memset(&cb->args[0], 0, sizeof(cb->args));
1955 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1956 break;
1957 }
1958 cb->family = idx;
1959
1960 return skb->len;
1961}
1962
1963void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change)
1964{
1965 struct net *net = dev_net(dev);
1966 struct sk_buff *skb;
1967 int err = -ENOBUFS;
1968 size_t if_info_size;
1969
1970 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1971 if (skb == NULL)
1972 goto errout;
1973
1974 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
1975 if (err < 0) {
1976 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1977 WARN_ON(err == -EMSGSIZE);
1978 kfree_skb(skb);
1979 goto errout;
1980 }
1981 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1982 return;
1983errout:
1984 if (err < 0)
1985 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1986}
1987
1988static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
1989 struct net_device *dev,
1990 u8 *addr, u32 pid, u32 seq,
1991 int type, unsigned int flags)
1992{
1993 struct nlmsghdr *nlh;
1994 struct ndmsg *ndm;
1995
1996 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI);
1997 if (!nlh)
1998 return -EMSGSIZE;
1999
2000 ndm = nlmsg_data(nlh);
2001 ndm->ndm_family = AF_BRIDGE;
2002 ndm->ndm_pad1 = 0;
2003 ndm->ndm_pad2 = 0;
2004 ndm->ndm_flags = flags;
2005 ndm->ndm_type = 0;
2006 ndm->ndm_ifindex = dev->ifindex;
2007 ndm->ndm_state = NUD_PERMANENT;
2008
2009 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2010 goto nla_put_failure;
2011
2012 return nlmsg_end(skb, nlh);
2013
2014nla_put_failure:
2015 nlmsg_cancel(skb, nlh);
2016 return -EMSGSIZE;
2017}
2018
2019static inline size_t rtnl_fdb_nlmsg_size(void)
2020{
2021 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2022}
2023
2024static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2025{
2026 struct net *net = dev_net(dev);
2027 struct sk_buff *skb;
2028 int err = -ENOBUFS;
2029
2030 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2031 if (!skb)
2032 goto errout;
2033
2034 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF);
2035 if (err < 0) {
2036 kfree_skb(skb);
2037 goto errout;
2038 }
2039
2040 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2041 return;
2042errout:
2043 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2044}
2045
2046static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2047{
2048 struct net *net = sock_net(skb->sk);
2049 struct net_device *master = NULL;
2050 struct ndmsg *ndm;
2051 struct nlattr *tb[NDA_MAX+1];
2052 struct net_device *dev;
2053 u8 *addr;
2054 int err;
2055
2056 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2057 if (err < 0)
2058 return err;
2059
2060 ndm = nlmsg_data(nlh);
2061 if (ndm->ndm_ifindex == 0) {
2062 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2063 return -EINVAL;
2064 }
2065
2066 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2067 if (dev == NULL) {
2068 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2069 return -ENODEV;
2070 }
2071
2072 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2073 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2074 return -EINVAL;
2075 }
2076
2077 addr = nla_data(tb[NDA_LLADDR]);
2078 if (!is_valid_ether_addr(addr)) {
2079 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ether address\n");
2080 return -EINVAL;
2081 }
2082
2083 err = -EOPNOTSUPP;
2084
2085 /* Support fdb on master device the net/bridge default case */
2086 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2087 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2088 master = dev->master;
2089 err = master->netdev_ops->ndo_fdb_add(ndm, dev, addr,
2090 nlh->nlmsg_flags);
2091 if (err)
2092 goto out;
2093 else
2094 ndm->ndm_flags &= ~NTF_MASTER;
2095 }
2096
2097 /* Embedded bridge, macvlan, and any other device support */
2098 if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_add) {
2099 err = dev->netdev_ops->ndo_fdb_add(ndm, dev, addr,
2100 nlh->nlmsg_flags);
2101
2102 if (!err) {
2103 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2104 ndm->ndm_flags &= ~NTF_SELF;
2105 }
2106 }
2107out:
2108 return err;
2109}
2110
2111static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2112{
2113 struct net *net = sock_net(skb->sk);
2114 struct ndmsg *ndm;
2115 struct nlattr *llattr;
2116 struct net_device *dev;
2117 int err = -EINVAL;
2118 __u8 *addr;
2119
2120 if (nlmsg_len(nlh) < sizeof(*ndm))
2121 return -EINVAL;
2122
2123 ndm = nlmsg_data(nlh);
2124 if (ndm->ndm_ifindex == 0) {
2125 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2126 return -EINVAL;
2127 }
2128
2129 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2130 if (dev == NULL) {
2131 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2132 return -ENODEV;
2133 }
2134
2135 llattr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_LLADDR);
2136 if (llattr == NULL || nla_len(llattr) != ETH_ALEN) {
2137 pr_info("PF_BRIGDE: RTM_DELNEIGH with invalid address\n");
2138 return -EINVAL;
2139 }
2140
2141 addr = nla_data(llattr);
2142 err = -EOPNOTSUPP;
2143
2144 /* Support fdb on master device the net/bridge default case */
2145 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2146 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2147 struct net_device *master = dev->master;
2148
2149 if (master->netdev_ops->ndo_fdb_del)
2150 err = master->netdev_ops->ndo_fdb_del(ndm, dev, addr);
2151
2152 if (err)
2153 goto out;
2154 else
2155 ndm->ndm_flags &= ~NTF_MASTER;
2156 }
2157
2158 /* Embedded bridge, macvlan, and any other device support */
2159 if ((ndm->ndm_flags & NTF_SELF) && dev->netdev_ops->ndo_fdb_del) {
2160 err = dev->netdev_ops->ndo_fdb_del(ndm, dev, addr);
2161
2162 if (!err) {
2163 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2164 ndm->ndm_flags &= ~NTF_SELF;
2165 }
2166 }
2167out:
2168 return err;
2169}
2170
2171static int nlmsg_populate_fdb(struct sk_buff *skb,
2172 struct netlink_callback *cb,
2173 struct net_device *dev,
2174 int *idx,
2175 struct netdev_hw_addr_list *list)
2176{
2177 struct netdev_hw_addr *ha;
2178 int err;
2179 u32 pid, seq;
2180
2181 pid = NETLINK_CB(cb->skb).pid;
2182 seq = cb->nlh->nlmsg_seq;
2183
2184 list_for_each_entry(ha, &list->list, list) {
2185 if (*idx < cb->args[0])
2186 goto skip;
2187
2188 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2189 pid, seq, 0, NTF_SELF);
2190 if (err < 0)
2191 return err;
2192skip:
2193 *idx += 1;
2194 }
2195 return 0;
2196}
2197
2198/**
2199 * ndo_dflt_fdb_dump: default netdevice operation to dump an FDB table.
2200 * @nlh: netlink message header
2201 * @dev: netdevice
2202 *
2203 * Default netdevice operation to dump the existing unicast address list.
2204 * Returns zero on success.
2205 */
2206int ndo_dflt_fdb_dump(struct sk_buff *skb,
2207 struct netlink_callback *cb,
2208 struct net_device *dev,
2209 int idx)
2210{
2211 int err;
2212
2213 netif_addr_lock_bh(dev);
2214 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2215 if (err)
2216 goto out;
2217 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2218out:
2219 netif_addr_unlock_bh(dev);
2220 return idx;
2221}
2222EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2223
2224static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2225{
2226 int idx = 0;
2227 struct net *net = sock_net(skb->sk);
2228 struct net_device *dev;
2229
2230 rcu_read_lock();
2231 for_each_netdev_rcu(net, dev) {
2232 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2233 struct net_device *master = dev->master;
2234 const struct net_device_ops *ops = master->netdev_ops;
2235
2236 if (ops->ndo_fdb_dump)
2237 idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
2238 }
2239
2240 if (dev->netdev_ops->ndo_fdb_dump)
2241 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
2242 }
2243 rcu_read_unlock();
2244
2245 cb->args[0] = idx;
2246 return skb->len;
2247}
2248
2249/* Protected by RTNL sempahore. */
2250static struct rtattr **rta_buf;
2251static int rtattr_max;
2252
2253/* Process one rtnetlink message. */
2254
2255static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2256{
2257 struct net *net = sock_net(skb->sk);
2258 rtnl_doit_func doit;
2259 int sz_idx, kind;
2260 int min_len;
2261 int family;
2262 int type;
2263 int err;
2264
2265 type = nlh->nlmsg_type;
2266 if (type > RTM_MAX)
2267 return -EOPNOTSUPP;
2268
2269 type -= RTM_BASE;
2270
2271 /* All the messages must have at least 1 byte length */
2272 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
2273 return 0;
2274
2275 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
2276 sz_idx = type>>2;
2277 kind = type&3;
2278
2279 if (kind != 2 && !capable(CAP_NET_ADMIN))
2280 return -EPERM;
2281
2282 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2283 struct sock *rtnl;
2284 rtnl_dumpit_func dumpit;
2285 rtnl_calcit_func calcit;
2286 u16 min_dump_alloc = 0;
2287
2288 dumpit = rtnl_get_dumpit(family, type);
2289 if (dumpit == NULL)
2290 return -EOPNOTSUPP;
2291 calcit = rtnl_get_calcit(family, type);
2292 if (calcit)
2293 min_dump_alloc = calcit(skb, nlh);
2294
2295 __rtnl_unlock();
2296 rtnl = net->rtnl;
2297 {
2298 struct netlink_dump_control c = {
2299 .dump = dumpit,
2300 .min_dump_alloc = min_dump_alloc,
2301 };
2302 err = netlink_dump_start(rtnl, skb, nlh, &c);
2303 }
2304 rtnl_lock();
2305 return err;
2306 }
2307
2308 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
2309
2310 min_len = rtm_min[sz_idx];
2311 if (nlh->nlmsg_len < min_len)
2312 return -EINVAL;
2313
2314 if (nlh->nlmsg_len > min_len) {
2315 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
2316 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
2317
2318 while (RTA_OK(attr, attrlen)) {
2319 unsigned int flavor = attr->rta_type;
2320 if (flavor) {
2321 if (flavor > rta_max[sz_idx])
2322 return -EINVAL;
2323 rta_buf[flavor-1] = attr;
2324 }
2325 attr = RTA_NEXT(attr, attrlen);
2326 }
2327 }
2328
2329 doit = rtnl_get_doit(family, type);
2330 if (doit == NULL)
2331 return -EOPNOTSUPP;
2332
2333 return doit(skb, nlh, (void *)&rta_buf[0]);
2334}
2335
2336static void rtnetlink_rcv(struct sk_buff *skb)
2337{
2338 rtnl_lock();
2339 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2340 rtnl_unlock();
2341}
2342
2343static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2344{
2345 struct net_device *dev = ptr;
2346
2347 switch (event) {
2348 case NETDEV_UP:
2349 case NETDEV_DOWN:
2350 case NETDEV_PRE_UP:
2351 case NETDEV_POST_INIT:
2352 case NETDEV_REGISTER:
2353 case NETDEV_CHANGE:
2354 case NETDEV_PRE_TYPE_CHANGE:
2355 case NETDEV_GOING_DOWN:
2356 case NETDEV_UNREGISTER:
2357 case NETDEV_UNREGISTER_BATCH:
2358 case NETDEV_RELEASE:
2359 case NETDEV_JOIN:
2360 break;
2361 default:
2362 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2363 break;
2364 }
2365 return NOTIFY_DONE;
2366}
2367
2368static struct notifier_block rtnetlink_dev_notifier = {
2369 .notifier_call = rtnetlink_event,
2370};
2371
2372
2373static int __net_init rtnetlink_net_init(struct net *net)
2374{
2375 struct sock *sk;
2376 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2377 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2378 if (!sk)
2379 return -ENOMEM;
2380 net->rtnl = sk;
2381 return 0;
2382}
2383
2384static void __net_exit rtnetlink_net_exit(struct net *net)
2385{
2386 netlink_kernel_release(net->rtnl);
2387 net->rtnl = NULL;
2388}
2389
2390static struct pernet_operations rtnetlink_net_ops = {
2391 .init = rtnetlink_net_init,
2392 .exit = rtnetlink_net_exit,
2393};
2394
2395void __init rtnetlink_init(void)
2396{
2397 int i;
2398
2399 rtattr_max = 0;
2400 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2401 if (rta_max[i] > rtattr_max)
2402 rtattr_max = rta_max[i];
2403 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2404 if (!rta_buf)
2405 panic("rtnetlink_init: cannot allocate rta_buf\n");
2406
2407 if (register_pernet_subsys(&rtnetlink_net_ops))
2408 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2409
2410 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2411 register_netdevice_notifier(&rtnetlink_dev_notifier);
2412
2413 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2414 rtnl_dump_ifinfo, rtnl_calcit);
2415 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2416 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2417 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2418
2419 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2420 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2421
2422 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
2423 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
2424 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
2425}
2426