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Merge tag 'vfio-v4.4-rc5' of git://github.com/awilliam/linux-vfio
[deliverable/linux.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/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/if_vlan.h>
40 #include <linux/pci.h>
41 #include <linux/etherdevice.h>
42
43 #include <asm/uaccess.h>
44
45 #include <linux/inet.h>
46 #include <linux/netdevice.h>
47 #include <net/switchdev.h>
48 #include <net/ip.h>
49 #include <net/protocol.h>
50 #include <net/arp.h>
51 #include <net/route.h>
52 #include <net/udp.h>
53 #include <net/tcp.h>
54 #include <net/sock.h>
55 #include <net/pkt_sched.h>
56 #include <net/fib_rules.h>
57 #include <net/rtnetlink.h>
58 #include <net/net_namespace.h>
59
60 struct rtnl_link {
61 rtnl_doit_func doit;
62 rtnl_dumpit_func dumpit;
63 rtnl_calcit_func calcit;
64 };
65
66 static DEFINE_MUTEX(rtnl_mutex);
67
68 void rtnl_lock(void)
69 {
70 mutex_lock(&rtnl_mutex);
71 }
72 EXPORT_SYMBOL(rtnl_lock);
73
74 void __rtnl_unlock(void)
75 {
76 mutex_unlock(&rtnl_mutex);
77 }
78
79 void rtnl_unlock(void)
80 {
81 /* This fellow will unlock it for us. */
82 netdev_run_todo();
83 }
84 EXPORT_SYMBOL(rtnl_unlock);
85
86 int rtnl_trylock(void)
87 {
88 return mutex_trylock(&rtnl_mutex);
89 }
90 EXPORT_SYMBOL(rtnl_trylock);
91
92 int rtnl_is_locked(void)
93 {
94 return mutex_is_locked(&rtnl_mutex);
95 }
96 EXPORT_SYMBOL(rtnl_is_locked);
97
98 #ifdef CONFIG_PROVE_LOCKING
99 bool lockdep_rtnl_is_held(void)
100 {
101 return lockdep_is_held(&rtnl_mutex);
102 }
103 EXPORT_SYMBOL(lockdep_rtnl_is_held);
104 #endif /* #ifdef CONFIG_PROVE_LOCKING */
105
106 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
107
108 static inline int rtm_msgindex(int msgtype)
109 {
110 int msgindex = msgtype - RTM_BASE;
111
112 /*
113 * msgindex < 0 implies someone tried to register a netlink
114 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
115 * the message type has not been added to linux/rtnetlink.h
116 */
117 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
118
119 return msgindex;
120 }
121
122 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
123 {
124 struct rtnl_link *tab;
125
126 if (protocol <= RTNL_FAMILY_MAX)
127 tab = rtnl_msg_handlers[protocol];
128 else
129 tab = NULL;
130
131 if (tab == NULL || tab[msgindex].doit == NULL)
132 tab = rtnl_msg_handlers[PF_UNSPEC];
133
134 return tab[msgindex].doit;
135 }
136
137 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
138 {
139 struct rtnl_link *tab;
140
141 if (protocol <= RTNL_FAMILY_MAX)
142 tab = rtnl_msg_handlers[protocol];
143 else
144 tab = NULL;
145
146 if (tab == NULL || tab[msgindex].dumpit == NULL)
147 tab = rtnl_msg_handlers[PF_UNSPEC];
148
149 return tab[msgindex].dumpit;
150 }
151
152 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
153 {
154 struct rtnl_link *tab;
155
156 if (protocol <= RTNL_FAMILY_MAX)
157 tab = rtnl_msg_handlers[protocol];
158 else
159 tab = NULL;
160
161 if (tab == NULL || tab[msgindex].calcit == NULL)
162 tab = rtnl_msg_handlers[PF_UNSPEC];
163
164 return tab[msgindex].calcit;
165 }
166
167 /**
168 * __rtnl_register - Register a rtnetlink message type
169 * @protocol: Protocol family or PF_UNSPEC
170 * @msgtype: rtnetlink message type
171 * @doit: Function pointer called for each request message
172 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
173 * @calcit: Function pointer to calc size of dump message
174 *
175 * Registers the specified function pointers (at least one of them has
176 * to be non-NULL) to be called whenever a request message for the
177 * specified protocol family and message type is received.
178 *
179 * The special protocol family PF_UNSPEC may be used to define fallback
180 * function pointers for the case when no entry for the specific protocol
181 * family exists.
182 *
183 * Returns 0 on success or a negative error code.
184 */
185 int __rtnl_register(int protocol, int msgtype,
186 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
187 rtnl_calcit_func calcit)
188 {
189 struct rtnl_link *tab;
190 int msgindex;
191
192 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
193 msgindex = rtm_msgindex(msgtype);
194
195 tab = rtnl_msg_handlers[protocol];
196 if (tab == NULL) {
197 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
198 if (tab == NULL)
199 return -ENOBUFS;
200
201 rtnl_msg_handlers[protocol] = tab;
202 }
203
204 if (doit)
205 tab[msgindex].doit = doit;
206
207 if (dumpit)
208 tab[msgindex].dumpit = dumpit;
209
210 if (calcit)
211 tab[msgindex].calcit = calcit;
212
213 return 0;
214 }
215 EXPORT_SYMBOL_GPL(__rtnl_register);
216
217 /**
218 * rtnl_register - Register a rtnetlink message type
219 *
220 * Identical to __rtnl_register() but panics on failure. This is useful
221 * as failure of this function is very unlikely, it can only happen due
222 * to lack of memory when allocating the chain to store all message
223 * handlers for a protocol. Meant for use in init functions where lack
224 * of memory implies no sense in continuing.
225 */
226 void rtnl_register(int protocol, int msgtype,
227 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
228 rtnl_calcit_func calcit)
229 {
230 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
231 panic("Unable to register rtnetlink message handler, "
232 "protocol = %d, message type = %d\n",
233 protocol, msgtype);
234 }
235 EXPORT_SYMBOL_GPL(rtnl_register);
236
237 /**
238 * rtnl_unregister - Unregister a rtnetlink message type
239 * @protocol: Protocol family or PF_UNSPEC
240 * @msgtype: rtnetlink message type
241 *
242 * Returns 0 on success or a negative error code.
243 */
244 int rtnl_unregister(int protocol, int msgtype)
245 {
246 int msgindex;
247
248 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
249 msgindex = rtm_msgindex(msgtype);
250
251 if (rtnl_msg_handlers[protocol] == NULL)
252 return -ENOENT;
253
254 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
255 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
256
257 return 0;
258 }
259 EXPORT_SYMBOL_GPL(rtnl_unregister);
260
261 /**
262 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
263 * @protocol : Protocol family or PF_UNSPEC
264 *
265 * Identical to calling rtnl_unregster() for all registered message types
266 * of a certain protocol family.
267 */
268 void rtnl_unregister_all(int protocol)
269 {
270 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
271
272 kfree(rtnl_msg_handlers[protocol]);
273 rtnl_msg_handlers[protocol] = NULL;
274 }
275 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
276
277 static LIST_HEAD(link_ops);
278
279 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
280 {
281 const struct rtnl_link_ops *ops;
282
283 list_for_each_entry(ops, &link_ops, list) {
284 if (!strcmp(ops->kind, kind))
285 return ops;
286 }
287 return NULL;
288 }
289
290 /**
291 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
292 * @ops: struct rtnl_link_ops * to register
293 *
294 * The caller must hold the rtnl_mutex. This function should be used
295 * by drivers that create devices during module initialization. It
296 * must be called before registering the devices.
297 *
298 * Returns 0 on success or a negative error code.
299 */
300 int __rtnl_link_register(struct rtnl_link_ops *ops)
301 {
302 if (rtnl_link_ops_get(ops->kind))
303 return -EEXIST;
304
305 /* The check for setup is here because if ops
306 * does not have that filled up, it is not possible
307 * to use the ops for creating device. So do not
308 * fill up dellink as well. That disables rtnl_dellink.
309 */
310 if (ops->setup && !ops->dellink)
311 ops->dellink = unregister_netdevice_queue;
312
313 list_add_tail(&ops->list, &link_ops);
314 return 0;
315 }
316 EXPORT_SYMBOL_GPL(__rtnl_link_register);
317
318 /**
319 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
320 * @ops: struct rtnl_link_ops * to register
321 *
322 * Returns 0 on success or a negative error code.
323 */
324 int rtnl_link_register(struct rtnl_link_ops *ops)
325 {
326 int err;
327
328 rtnl_lock();
329 err = __rtnl_link_register(ops);
330 rtnl_unlock();
331 return err;
332 }
333 EXPORT_SYMBOL_GPL(rtnl_link_register);
334
335 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
336 {
337 struct net_device *dev;
338 LIST_HEAD(list_kill);
339
340 for_each_netdev(net, dev) {
341 if (dev->rtnl_link_ops == ops)
342 ops->dellink(dev, &list_kill);
343 }
344 unregister_netdevice_many(&list_kill);
345 }
346
347 /**
348 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
349 * @ops: struct rtnl_link_ops * to unregister
350 *
351 * The caller must hold the rtnl_mutex.
352 */
353 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
354 {
355 struct net *net;
356
357 for_each_net(net) {
358 __rtnl_kill_links(net, ops);
359 }
360 list_del(&ops->list);
361 }
362 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
363
364 /* Return with the rtnl_lock held when there are no network
365 * devices unregistering in any network namespace.
366 */
367 static void rtnl_lock_unregistering_all(void)
368 {
369 struct net *net;
370 bool unregistering;
371 DEFINE_WAIT_FUNC(wait, woken_wake_function);
372
373 add_wait_queue(&netdev_unregistering_wq, &wait);
374 for (;;) {
375 unregistering = false;
376 rtnl_lock();
377 for_each_net(net) {
378 if (net->dev_unreg_count > 0) {
379 unregistering = true;
380 break;
381 }
382 }
383 if (!unregistering)
384 break;
385 __rtnl_unlock();
386
387 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
388 }
389 remove_wait_queue(&netdev_unregistering_wq, &wait);
390 }
391
392 /**
393 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
394 * @ops: struct rtnl_link_ops * to unregister
395 */
396 void rtnl_link_unregister(struct rtnl_link_ops *ops)
397 {
398 /* Close the race with cleanup_net() */
399 mutex_lock(&net_mutex);
400 rtnl_lock_unregistering_all();
401 __rtnl_link_unregister(ops);
402 rtnl_unlock();
403 mutex_unlock(&net_mutex);
404 }
405 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
406
407 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
408 {
409 struct net_device *master_dev;
410 const struct rtnl_link_ops *ops;
411
412 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
413 if (!master_dev)
414 return 0;
415 ops = master_dev->rtnl_link_ops;
416 if (!ops || !ops->get_slave_size)
417 return 0;
418 /* IFLA_INFO_SLAVE_DATA + nested data */
419 return nla_total_size(sizeof(struct nlattr)) +
420 ops->get_slave_size(master_dev, dev);
421 }
422
423 static size_t rtnl_link_get_size(const struct net_device *dev)
424 {
425 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
426 size_t size;
427
428 if (!ops)
429 return 0;
430
431 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
432 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
433
434 if (ops->get_size)
435 /* IFLA_INFO_DATA + nested data */
436 size += nla_total_size(sizeof(struct nlattr)) +
437 ops->get_size(dev);
438
439 if (ops->get_xstats_size)
440 /* IFLA_INFO_XSTATS */
441 size += nla_total_size(ops->get_xstats_size(dev));
442
443 size += rtnl_link_get_slave_info_data_size(dev);
444
445 return size;
446 }
447
448 static LIST_HEAD(rtnl_af_ops);
449
450 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
451 {
452 const struct rtnl_af_ops *ops;
453
454 list_for_each_entry(ops, &rtnl_af_ops, list) {
455 if (ops->family == family)
456 return ops;
457 }
458
459 return NULL;
460 }
461
462 /**
463 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
464 * @ops: struct rtnl_af_ops * to register
465 *
466 * Returns 0 on success or a negative error code.
467 */
468 void rtnl_af_register(struct rtnl_af_ops *ops)
469 {
470 rtnl_lock();
471 list_add_tail(&ops->list, &rtnl_af_ops);
472 rtnl_unlock();
473 }
474 EXPORT_SYMBOL_GPL(rtnl_af_register);
475
476 /**
477 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
478 * @ops: struct rtnl_af_ops * to unregister
479 *
480 * The caller must hold the rtnl_mutex.
481 */
482 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
483 {
484 list_del(&ops->list);
485 }
486 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
487
488 /**
489 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
490 * @ops: struct rtnl_af_ops * to unregister
491 */
492 void rtnl_af_unregister(struct rtnl_af_ops *ops)
493 {
494 rtnl_lock();
495 __rtnl_af_unregister(ops);
496 rtnl_unlock();
497 }
498 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
499
500 static size_t rtnl_link_get_af_size(const struct net_device *dev,
501 u32 ext_filter_mask)
502 {
503 struct rtnl_af_ops *af_ops;
504 size_t size;
505
506 /* IFLA_AF_SPEC */
507 size = nla_total_size(sizeof(struct nlattr));
508
509 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
510 if (af_ops->get_link_af_size) {
511 /* AF_* + nested data */
512 size += nla_total_size(sizeof(struct nlattr)) +
513 af_ops->get_link_af_size(dev, ext_filter_mask);
514 }
515 }
516
517 return size;
518 }
519
520 static bool rtnl_have_link_slave_info(const struct net_device *dev)
521 {
522 struct net_device *master_dev;
523
524 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
525 if (master_dev && master_dev->rtnl_link_ops)
526 return true;
527 return false;
528 }
529
530 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
531 const struct net_device *dev)
532 {
533 struct net_device *master_dev;
534 const struct rtnl_link_ops *ops;
535 struct nlattr *slave_data;
536 int err;
537
538 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
539 if (!master_dev)
540 return 0;
541 ops = master_dev->rtnl_link_ops;
542 if (!ops)
543 return 0;
544 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
545 return -EMSGSIZE;
546 if (ops->fill_slave_info) {
547 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
548 if (!slave_data)
549 return -EMSGSIZE;
550 err = ops->fill_slave_info(skb, master_dev, dev);
551 if (err < 0)
552 goto err_cancel_slave_data;
553 nla_nest_end(skb, slave_data);
554 }
555 return 0;
556
557 err_cancel_slave_data:
558 nla_nest_cancel(skb, slave_data);
559 return err;
560 }
561
562 static int rtnl_link_info_fill(struct sk_buff *skb,
563 const struct net_device *dev)
564 {
565 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
566 struct nlattr *data;
567 int err;
568
569 if (!ops)
570 return 0;
571 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
572 return -EMSGSIZE;
573 if (ops->fill_xstats) {
574 err = ops->fill_xstats(skb, dev);
575 if (err < 0)
576 return err;
577 }
578 if (ops->fill_info) {
579 data = nla_nest_start(skb, IFLA_INFO_DATA);
580 if (data == NULL)
581 return -EMSGSIZE;
582 err = ops->fill_info(skb, dev);
583 if (err < 0)
584 goto err_cancel_data;
585 nla_nest_end(skb, data);
586 }
587 return 0;
588
589 err_cancel_data:
590 nla_nest_cancel(skb, data);
591 return err;
592 }
593
594 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
595 {
596 struct nlattr *linkinfo;
597 int err = -EMSGSIZE;
598
599 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
600 if (linkinfo == NULL)
601 goto out;
602
603 err = rtnl_link_info_fill(skb, dev);
604 if (err < 0)
605 goto err_cancel_link;
606
607 err = rtnl_link_slave_info_fill(skb, dev);
608 if (err < 0)
609 goto err_cancel_link;
610
611 nla_nest_end(skb, linkinfo);
612 return 0;
613
614 err_cancel_link:
615 nla_nest_cancel(skb, linkinfo);
616 out:
617 return err;
618 }
619
620 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
621 {
622 struct sock *rtnl = net->rtnl;
623 int err = 0;
624
625 NETLINK_CB(skb).dst_group = group;
626 if (echo)
627 atomic_inc(&skb->users);
628 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
629 if (echo)
630 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
631 return err;
632 }
633
634 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
635 {
636 struct sock *rtnl = net->rtnl;
637
638 return nlmsg_unicast(rtnl, skb, pid);
639 }
640 EXPORT_SYMBOL(rtnl_unicast);
641
642 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
643 struct nlmsghdr *nlh, gfp_t flags)
644 {
645 struct sock *rtnl = net->rtnl;
646 int report = 0;
647
648 if (nlh)
649 report = nlmsg_report(nlh);
650
651 nlmsg_notify(rtnl, skb, pid, group, report, flags);
652 }
653 EXPORT_SYMBOL(rtnl_notify);
654
655 void rtnl_set_sk_err(struct net *net, u32 group, int error)
656 {
657 struct sock *rtnl = net->rtnl;
658
659 netlink_set_err(rtnl, 0, group, error);
660 }
661 EXPORT_SYMBOL(rtnl_set_sk_err);
662
663 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
664 {
665 struct nlattr *mx;
666 int i, valid = 0;
667
668 mx = nla_nest_start(skb, RTA_METRICS);
669 if (mx == NULL)
670 return -ENOBUFS;
671
672 for (i = 0; i < RTAX_MAX; i++) {
673 if (metrics[i]) {
674 if (i == RTAX_CC_ALGO - 1) {
675 char tmp[TCP_CA_NAME_MAX], *name;
676
677 name = tcp_ca_get_name_by_key(metrics[i], tmp);
678 if (!name)
679 continue;
680 if (nla_put_string(skb, i + 1, name))
681 goto nla_put_failure;
682 } else if (i == RTAX_FEATURES - 1) {
683 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
684
685 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
686 if (nla_put_u32(skb, i + 1, user_features))
687 goto nla_put_failure;
688 } else {
689 if (nla_put_u32(skb, i + 1, metrics[i]))
690 goto nla_put_failure;
691 }
692 valid++;
693 }
694 }
695
696 if (!valid) {
697 nla_nest_cancel(skb, mx);
698 return 0;
699 }
700
701 return nla_nest_end(skb, mx);
702
703 nla_put_failure:
704 nla_nest_cancel(skb, mx);
705 return -EMSGSIZE;
706 }
707 EXPORT_SYMBOL(rtnetlink_put_metrics);
708
709 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
710 long expires, u32 error)
711 {
712 struct rta_cacheinfo ci = {
713 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
714 .rta_used = dst->__use,
715 .rta_clntref = atomic_read(&(dst->__refcnt)),
716 .rta_error = error,
717 .rta_id = id,
718 };
719
720 if (expires) {
721 unsigned long clock;
722
723 clock = jiffies_to_clock_t(abs(expires));
724 clock = min_t(unsigned long, clock, INT_MAX);
725 ci.rta_expires = (expires > 0) ? clock : -clock;
726 }
727 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
728 }
729 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
730
731 static void set_operstate(struct net_device *dev, unsigned char transition)
732 {
733 unsigned char operstate = dev->operstate;
734
735 switch (transition) {
736 case IF_OPER_UP:
737 if ((operstate == IF_OPER_DORMANT ||
738 operstate == IF_OPER_UNKNOWN) &&
739 !netif_dormant(dev))
740 operstate = IF_OPER_UP;
741 break;
742
743 case IF_OPER_DORMANT:
744 if (operstate == IF_OPER_UP ||
745 operstate == IF_OPER_UNKNOWN)
746 operstate = IF_OPER_DORMANT;
747 break;
748 }
749
750 if (dev->operstate != operstate) {
751 write_lock_bh(&dev_base_lock);
752 dev->operstate = operstate;
753 write_unlock_bh(&dev_base_lock);
754 netdev_state_change(dev);
755 }
756 }
757
758 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
759 {
760 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
761 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
762 }
763
764 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
765 const struct ifinfomsg *ifm)
766 {
767 unsigned int flags = ifm->ifi_flags;
768
769 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
770 if (ifm->ifi_change)
771 flags = (flags & ifm->ifi_change) |
772 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
773
774 return flags;
775 }
776
777 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
778 const struct rtnl_link_stats64 *b)
779 {
780 a->rx_packets = b->rx_packets;
781 a->tx_packets = b->tx_packets;
782 a->rx_bytes = b->rx_bytes;
783 a->tx_bytes = b->tx_bytes;
784 a->rx_errors = b->rx_errors;
785 a->tx_errors = b->tx_errors;
786 a->rx_dropped = b->rx_dropped;
787 a->tx_dropped = b->tx_dropped;
788
789 a->multicast = b->multicast;
790 a->collisions = b->collisions;
791
792 a->rx_length_errors = b->rx_length_errors;
793 a->rx_over_errors = b->rx_over_errors;
794 a->rx_crc_errors = b->rx_crc_errors;
795 a->rx_frame_errors = b->rx_frame_errors;
796 a->rx_fifo_errors = b->rx_fifo_errors;
797 a->rx_missed_errors = b->rx_missed_errors;
798
799 a->tx_aborted_errors = b->tx_aborted_errors;
800 a->tx_carrier_errors = b->tx_carrier_errors;
801 a->tx_fifo_errors = b->tx_fifo_errors;
802 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
803 a->tx_window_errors = b->tx_window_errors;
804
805 a->rx_compressed = b->rx_compressed;
806 a->tx_compressed = b->tx_compressed;
807 }
808
809 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
810 {
811 memcpy(v, b, sizeof(*b));
812 }
813
814 /* All VF info */
815 static inline int rtnl_vfinfo_size(const struct net_device *dev,
816 u32 ext_filter_mask)
817 {
818 if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
819 (ext_filter_mask & RTEXT_FILTER_VF)) {
820 int num_vfs = dev_num_vf(dev->dev.parent);
821 size_t size = nla_total_size(sizeof(struct nlattr));
822 size += nla_total_size(num_vfs * sizeof(struct nlattr));
823 size += num_vfs *
824 (nla_total_size(sizeof(struct ifla_vf_mac)) +
825 nla_total_size(sizeof(struct ifla_vf_vlan)) +
826 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
827 nla_total_size(sizeof(struct ifla_vf_rate)) +
828 nla_total_size(sizeof(struct ifla_vf_link_state)) +
829 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
830 /* IFLA_VF_STATS_RX_PACKETS */
831 nla_total_size(sizeof(__u64)) +
832 /* IFLA_VF_STATS_TX_PACKETS */
833 nla_total_size(sizeof(__u64)) +
834 /* IFLA_VF_STATS_RX_BYTES */
835 nla_total_size(sizeof(__u64)) +
836 /* IFLA_VF_STATS_TX_BYTES */
837 nla_total_size(sizeof(__u64)) +
838 /* IFLA_VF_STATS_BROADCAST */
839 nla_total_size(sizeof(__u64)) +
840 /* IFLA_VF_STATS_MULTICAST */
841 nla_total_size(sizeof(__u64)) +
842 nla_total_size(sizeof(struct ifla_vf_trust)));
843 return size;
844 } else
845 return 0;
846 }
847
848 static size_t rtnl_port_size(const struct net_device *dev,
849 u32 ext_filter_mask)
850 {
851 size_t port_size = nla_total_size(4) /* PORT_VF */
852 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
853 + nla_total_size(sizeof(struct ifla_port_vsi))
854 /* PORT_VSI_TYPE */
855 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
856 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
857 + nla_total_size(1) /* PROT_VDP_REQUEST */
858 + nla_total_size(2); /* PORT_VDP_RESPONSE */
859 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
860 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
861 + port_size;
862 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
863 + port_size;
864
865 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
866 !(ext_filter_mask & RTEXT_FILTER_VF))
867 return 0;
868 if (dev_num_vf(dev->dev.parent))
869 return port_self_size + vf_ports_size +
870 vf_port_size * dev_num_vf(dev->dev.parent);
871 else
872 return port_self_size;
873 }
874
875 static noinline size_t if_nlmsg_size(const struct net_device *dev,
876 u32 ext_filter_mask)
877 {
878 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
879 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
880 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
881 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
882 + nla_total_size(sizeof(struct rtnl_link_ifmap))
883 + nla_total_size(sizeof(struct rtnl_link_stats))
884 + nla_total_size(sizeof(struct rtnl_link_stats64))
885 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
886 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
887 + nla_total_size(4) /* IFLA_TXQLEN */
888 + nla_total_size(4) /* IFLA_WEIGHT */
889 + nla_total_size(4) /* IFLA_MTU */
890 + nla_total_size(4) /* IFLA_LINK */
891 + nla_total_size(4) /* IFLA_MASTER */
892 + nla_total_size(1) /* IFLA_CARRIER */
893 + nla_total_size(4) /* IFLA_PROMISCUITY */
894 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
895 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
896 + nla_total_size(1) /* IFLA_OPERSTATE */
897 + nla_total_size(1) /* IFLA_LINKMODE */
898 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
899 + nla_total_size(4) /* IFLA_LINK_NETNSID */
900 + nla_total_size(ext_filter_mask
901 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
902 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
903 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
904 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
905 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
906 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
907 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
908 + nla_total_size(1); /* IFLA_PROTO_DOWN */
909
910 }
911
912 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
913 {
914 struct nlattr *vf_ports;
915 struct nlattr *vf_port;
916 int vf;
917 int err;
918
919 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
920 if (!vf_ports)
921 return -EMSGSIZE;
922
923 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
924 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
925 if (!vf_port)
926 goto nla_put_failure;
927 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
928 goto nla_put_failure;
929 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
930 if (err == -EMSGSIZE)
931 goto nla_put_failure;
932 if (err) {
933 nla_nest_cancel(skb, vf_port);
934 continue;
935 }
936 nla_nest_end(skb, vf_port);
937 }
938
939 nla_nest_end(skb, vf_ports);
940
941 return 0;
942
943 nla_put_failure:
944 nla_nest_cancel(skb, vf_ports);
945 return -EMSGSIZE;
946 }
947
948 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
949 {
950 struct nlattr *port_self;
951 int err;
952
953 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
954 if (!port_self)
955 return -EMSGSIZE;
956
957 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
958 if (err) {
959 nla_nest_cancel(skb, port_self);
960 return (err == -EMSGSIZE) ? err : 0;
961 }
962
963 nla_nest_end(skb, port_self);
964
965 return 0;
966 }
967
968 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
969 u32 ext_filter_mask)
970 {
971 int err;
972
973 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
974 !(ext_filter_mask & RTEXT_FILTER_VF))
975 return 0;
976
977 err = rtnl_port_self_fill(skb, dev);
978 if (err)
979 return err;
980
981 if (dev_num_vf(dev->dev.parent)) {
982 err = rtnl_vf_ports_fill(skb, dev);
983 if (err)
984 return err;
985 }
986
987 return 0;
988 }
989
990 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
991 {
992 int err;
993 struct netdev_phys_item_id ppid;
994
995 err = dev_get_phys_port_id(dev, &ppid);
996 if (err) {
997 if (err == -EOPNOTSUPP)
998 return 0;
999 return err;
1000 }
1001
1002 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1003 return -EMSGSIZE;
1004
1005 return 0;
1006 }
1007
1008 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1009 {
1010 char name[IFNAMSIZ];
1011 int err;
1012
1013 err = dev_get_phys_port_name(dev, name, sizeof(name));
1014 if (err) {
1015 if (err == -EOPNOTSUPP)
1016 return 0;
1017 return err;
1018 }
1019
1020 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
1021 return -EMSGSIZE;
1022
1023 return 0;
1024 }
1025
1026 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1027 {
1028 int err;
1029 struct switchdev_attr attr = {
1030 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1031 .flags = SWITCHDEV_F_NO_RECURSE,
1032 };
1033
1034 err = switchdev_port_attr_get(dev, &attr);
1035 if (err) {
1036 if (err == -EOPNOTSUPP)
1037 return 0;
1038 return err;
1039 }
1040
1041 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1042 attr.u.ppid.id))
1043 return -EMSGSIZE;
1044
1045 return 0;
1046 }
1047
1048 static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1049 struct net_device *dev)
1050 {
1051 const struct rtnl_link_stats64 *stats;
1052 struct rtnl_link_stats64 temp;
1053 struct nlattr *attr;
1054
1055 stats = dev_get_stats(dev, &temp);
1056
1057 attr = nla_reserve(skb, IFLA_STATS,
1058 sizeof(struct rtnl_link_stats));
1059 if (!attr)
1060 return -EMSGSIZE;
1061
1062 copy_rtnl_link_stats(nla_data(attr), stats);
1063
1064 attr = nla_reserve(skb, IFLA_STATS64,
1065 sizeof(struct rtnl_link_stats64));
1066 if (!attr)
1067 return -EMSGSIZE;
1068
1069 copy_rtnl_link_stats64(nla_data(attr), stats);
1070
1071 return 0;
1072 }
1073
1074 static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1075 struct net_device *dev,
1076 int vfs_num,
1077 struct nlattr *vfinfo)
1078 {
1079 struct ifla_vf_rss_query_en vf_rss_query_en;
1080 struct ifla_vf_link_state vf_linkstate;
1081 struct ifla_vf_spoofchk vf_spoofchk;
1082 struct ifla_vf_tx_rate vf_tx_rate;
1083 struct ifla_vf_stats vf_stats;
1084 struct ifla_vf_trust vf_trust;
1085 struct ifla_vf_vlan vf_vlan;
1086 struct ifla_vf_rate vf_rate;
1087 struct nlattr *vf, *vfstats;
1088 struct ifla_vf_mac vf_mac;
1089 struct ifla_vf_info ivi;
1090
1091 /* Not all SR-IOV capable drivers support the
1092 * spoofcheck and "RSS query enable" query. Preset to
1093 * -1 so the user space tool can detect that the driver
1094 * didn't report anything.
1095 */
1096 ivi.spoofchk = -1;
1097 ivi.rss_query_en = -1;
1098 ivi.trusted = -1;
1099 memset(ivi.mac, 0, sizeof(ivi.mac));
1100 /* The default value for VF link state is "auto"
1101 * IFLA_VF_LINK_STATE_AUTO which equals zero
1102 */
1103 ivi.linkstate = 0;
1104 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1105 return 0;
1106
1107 vf_mac.vf =
1108 vf_vlan.vf =
1109 vf_rate.vf =
1110 vf_tx_rate.vf =
1111 vf_spoofchk.vf =
1112 vf_linkstate.vf =
1113 vf_rss_query_en.vf =
1114 vf_trust.vf = ivi.vf;
1115
1116 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1117 vf_vlan.vlan = ivi.vlan;
1118 vf_vlan.qos = ivi.qos;
1119 vf_tx_rate.rate = ivi.max_tx_rate;
1120 vf_rate.min_tx_rate = ivi.min_tx_rate;
1121 vf_rate.max_tx_rate = ivi.max_tx_rate;
1122 vf_spoofchk.setting = ivi.spoofchk;
1123 vf_linkstate.link_state = ivi.linkstate;
1124 vf_rss_query_en.setting = ivi.rss_query_en;
1125 vf_trust.setting = ivi.trusted;
1126 vf = nla_nest_start(skb, IFLA_VF_INFO);
1127 if (!vf) {
1128 nla_nest_cancel(skb, vfinfo);
1129 return -EMSGSIZE;
1130 }
1131 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1132 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1133 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1134 &vf_rate) ||
1135 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1136 &vf_tx_rate) ||
1137 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1138 &vf_spoofchk) ||
1139 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1140 &vf_linkstate) ||
1141 nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1142 sizeof(vf_rss_query_en),
1143 &vf_rss_query_en) ||
1144 nla_put(skb, IFLA_VF_TRUST,
1145 sizeof(vf_trust), &vf_trust))
1146 return -EMSGSIZE;
1147 memset(&vf_stats, 0, sizeof(vf_stats));
1148 if (dev->netdev_ops->ndo_get_vf_stats)
1149 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1150 &vf_stats);
1151 vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1152 if (!vfstats) {
1153 nla_nest_cancel(skb, vf);
1154 nla_nest_cancel(skb, vfinfo);
1155 return -EMSGSIZE;
1156 }
1157 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS,
1158 vf_stats.rx_packets) ||
1159 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS,
1160 vf_stats.tx_packets) ||
1161 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES,
1162 vf_stats.rx_bytes) ||
1163 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES,
1164 vf_stats.tx_bytes) ||
1165 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST,
1166 vf_stats.broadcast) ||
1167 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST,
1168 vf_stats.multicast))
1169 return -EMSGSIZE;
1170 nla_nest_end(skb, vfstats);
1171 nla_nest_end(skb, vf);
1172 return 0;
1173 }
1174
1175 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1176 {
1177 struct rtnl_link_ifmap map = {
1178 .mem_start = dev->mem_start,
1179 .mem_end = dev->mem_end,
1180 .base_addr = dev->base_addr,
1181 .irq = dev->irq,
1182 .dma = dev->dma,
1183 .port = dev->if_port,
1184 };
1185 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1186 return -EMSGSIZE;
1187
1188 return 0;
1189 }
1190
1191 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1192 int type, u32 pid, u32 seq, u32 change,
1193 unsigned int flags, u32 ext_filter_mask)
1194 {
1195 struct ifinfomsg *ifm;
1196 struct nlmsghdr *nlh;
1197 struct nlattr *af_spec;
1198 struct rtnl_af_ops *af_ops;
1199 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1200
1201 ASSERT_RTNL();
1202 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1203 if (nlh == NULL)
1204 return -EMSGSIZE;
1205
1206 ifm = nlmsg_data(nlh);
1207 ifm->ifi_family = AF_UNSPEC;
1208 ifm->__ifi_pad = 0;
1209 ifm->ifi_type = dev->type;
1210 ifm->ifi_index = dev->ifindex;
1211 ifm->ifi_flags = dev_get_flags(dev);
1212 ifm->ifi_change = change;
1213
1214 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1215 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1216 nla_put_u8(skb, IFLA_OPERSTATE,
1217 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1218 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1219 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1220 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1221 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1222 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1223 #ifdef CONFIG_RPS
1224 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1225 #endif
1226 (dev->ifindex != dev_get_iflink(dev) &&
1227 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1228 (upper_dev &&
1229 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1230 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1231 (dev->qdisc &&
1232 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1233 (dev->ifalias &&
1234 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1235 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1236 atomic_read(&dev->carrier_changes)) ||
1237 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1238 goto nla_put_failure;
1239
1240 if (rtnl_fill_link_ifmap(skb, dev))
1241 goto nla_put_failure;
1242
1243 if (dev->addr_len) {
1244 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1245 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1246 goto nla_put_failure;
1247 }
1248
1249 if (rtnl_phys_port_id_fill(skb, dev))
1250 goto nla_put_failure;
1251
1252 if (rtnl_phys_port_name_fill(skb, dev))
1253 goto nla_put_failure;
1254
1255 if (rtnl_phys_switch_id_fill(skb, dev))
1256 goto nla_put_failure;
1257
1258 if (rtnl_fill_stats(skb, dev))
1259 goto nla_put_failure;
1260
1261 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1262 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1263 goto nla_put_failure;
1264
1265 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent &&
1266 ext_filter_mask & RTEXT_FILTER_VF) {
1267 int i;
1268 struct nlattr *vfinfo;
1269 int num_vfs = dev_num_vf(dev->dev.parent);
1270
1271 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1272 if (!vfinfo)
1273 goto nla_put_failure;
1274 for (i = 0; i < num_vfs; i++) {
1275 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1276 goto nla_put_failure;
1277 }
1278
1279 nla_nest_end(skb, vfinfo);
1280 }
1281
1282 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1283 goto nla_put_failure;
1284
1285 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1286 if (rtnl_link_fill(skb, dev) < 0)
1287 goto nla_put_failure;
1288 }
1289
1290 if (dev->rtnl_link_ops &&
1291 dev->rtnl_link_ops->get_link_net) {
1292 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1293
1294 if (!net_eq(dev_net(dev), link_net)) {
1295 int id = peernet2id_alloc(dev_net(dev), link_net);
1296
1297 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1298 goto nla_put_failure;
1299 }
1300 }
1301
1302 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1303 goto nla_put_failure;
1304
1305 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1306 if (af_ops->fill_link_af) {
1307 struct nlattr *af;
1308 int err;
1309
1310 if (!(af = nla_nest_start(skb, af_ops->family)))
1311 goto nla_put_failure;
1312
1313 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1314
1315 /*
1316 * Caller may return ENODATA to indicate that there
1317 * was no data to be dumped. This is not an error, it
1318 * means we should trim the attribute header and
1319 * continue.
1320 */
1321 if (err == -ENODATA)
1322 nla_nest_cancel(skb, af);
1323 else if (err < 0)
1324 goto nla_put_failure;
1325
1326 nla_nest_end(skb, af);
1327 }
1328 }
1329
1330 nla_nest_end(skb, af_spec);
1331
1332 nlmsg_end(skb, nlh);
1333 return 0;
1334
1335 nla_put_failure:
1336 nlmsg_cancel(skb, nlh);
1337 return -EMSGSIZE;
1338 }
1339
1340 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1341 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1342 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1343 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1344 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1345 [IFLA_MTU] = { .type = NLA_U32 },
1346 [IFLA_LINK] = { .type = NLA_U32 },
1347 [IFLA_MASTER] = { .type = NLA_U32 },
1348 [IFLA_CARRIER] = { .type = NLA_U8 },
1349 [IFLA_TXQLEN] = { .type = NLA_U32 },
1350 [IFLA_WEIGHT] = { .type = NLA_U32 },
1351 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1352 [IFLA_LINKMODE] = { .type = NLA_U8 },
1353 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1354 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1355 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1356 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1357 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1358 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1359 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1360 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1361 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1362 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1363 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1364 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1365 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1366 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1367 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1368 [IFLA_LINK_NETNSID] = { .type = NLA_S32 },
1369 [IFLA_PROTO_DOWN] = { .type = NLA_U8 },
1370 };
1371
1372 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1373 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1374 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1375 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1376 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1377 };
1378
1379 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1380 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
1381 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
1382 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
1383 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
1384 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) },
1385 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) },
1386 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) },
1387 [IFLA_VF_STATS] = { .type = NLA_NESTED },
1388 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) },
1389 };
1390
1391 static const struct nla_policy ifla_vf_stats_policy[IFLA_VF_STATS_MAX + 1] = {
1392 [IFLA_VF_STATS_RX_PACKETS] = { .type = NLA_U64 },
1393 [IFLA_VF_STATS_TX_PACKETS] = { .type = NLA_U64 },
1394 [IFLA_VF_STATS_RX_BYTES] = { .type = NLA_U64 },
1395 [IFLA_VF_STATS_TX_BYTES] = { .type = NLA_U64 },
1396 [IFLA_VF_STATS_BROADCAST] = { .type = NLA_U64 },
1397 [IFLA_VF_STATS_MULTICAST] = { .type = NLA_U64 },
1398 };
1399
1400 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1401 [IFLA_PORT_VF] = { .type = NLA_U32 },
1402 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1403 .len = PORT_PROFILE_MAX },
1404 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1405 .len = sizeof(struct ifla_port_vsi)},
1406 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1407 .len = PORT_UUID_MAX },
1408 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1409 .len = PORT_UUID_MAX },
1410 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1411 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1412 };
1413
1414 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1415 {
1416 struct net *net = sock_net(skb->sk);
1417 int h, s_h;
1418 int idx = 0, s_idx;
1419 struct net_device *dev;
1420 struct hlist_head *head;
1421 struct nlattr *tb[IFLA_MAX+1];
1422 u32 ext_filter_mask = 0;
1423 int err;
1424 int hdrlen;
1425
1426 s_h = cb->args[0];
1427 s_idx = cb->args[1];
1428
1429 cb->seq = net->dev_base_seq;
1430
1431 /* A hack to preserve kernel<->userspace interface.
1432 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1433 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1434 * what iproute2 < v3.9.0 used.
1435 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1436 * attribute, its netlink message is shorter than struct ifinfomsg.
1437 */
1438 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1439 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1440
1441 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1442
1443 if (tb[IFLA_EXT_MASK])
1444 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1445 }
1446
1447 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1448 idx = 0;
1449 head = &net->dev_index_head[h];
1450 hlist_for_each_entry(dev, head, index_hlist) {
1451 if (idx < s_idx)
1452 goto cont;
1453 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1454 NETLINK_CB(cb->skb).portid,
1455 cb->nlh->nlmsg_seq, 0,
1456 NLM_F_MULTI,
1457 ext_filter_mask);
1458 /* If we ran out of room on the first message,
1459 * we're in trouble
1460 */
1461 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1462
1463 if (err < 0)
1464 goto out;
1465
1466 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1467 cont:
1468 idx++;
1469 }
1470 }
1471 out:
1472 cb->args[1] = idx;
1473 cb->args[0] = h;
1474
1475 return skb->len;
1476 }
1477
1478 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1479 {
1480 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1481 }
1482 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1483
1484 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1485 {
1486 struct net *net;
1487 /* Examine the link attributes and figure out which
1488 * network namespace we are talking about.
1489 */
1490 if (tb[IFLA_NET_NS_PID])
1491 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1492 else if (tb[IFLA_NET_NS_FD])
1493 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1494 else
1495 net = get_net(src_net);
1496 return net;
1497 }
1498 EXPORT_SYMBOL(rtnl_link_get_net);
1499
1500 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1501 {
1502 if (dev) {
1503 if (tb[IFLA_ADDRESS] &&
1504 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1505 return -EINVAL;
1506
1507 if (tb[IFLA_BROADCAST] &&
1508 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1509 return -EINVAL;
1510 }
1511
1512 if (tb[IFLA_AF_SPEC]) {
1513 struct nlattr *af;
1514 int rem, err;
1515
1516 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1517 const struct rtnl_af_ops *af_ops;
1518
1519 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1520 return -EAFNOSUPPORT;
1521
1522 if (!af_ops->set_link_af)
1523 return -EOPNOTSUPP;
1524
1525 if (af_ops->validate_link_af) {
1526 err = af_ops->validate_link_af(dev, af);
1527 if (err < 0)
1528 return err;
1529 }
1530 }
1531 }
1532
1533 return 0;
1534 }
1535
1536 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1537 {
1538 const struct net_device_ops *ops = dev->netdev_ops;
1539 int err = -EINVAL;
1540
1541 if (tb[IFLA_VF_MAC]) {
1542 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1543
1544 err = -EOPNOTSUPP;
1545 if (ops->ndo_set_vf_mac)
1546 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1547 ivm->mac);
1548 if (err < 0)
1549 return err;
1550 }
1551
1552 if (tb[IFLA_VF_VLAN]) {
1553 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1554
1555 err = -EOPNOTSUPP;
1556 if (ops->ndo_set_vf_vlan)
1557 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1558 ivv->qos);
1559 if (err < 0)
1560 return err;
1561 }
1562
1563 if (tb[IFLA_VF_TX_RATE]) {
1564 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1565 struct ifla_vf_info ivf;
1566
1567 err = -EOPNOTSUPP;
1568 if (ops->ndo_get_vf_config)
1569 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1570 if (err < 0)
1571 return err;
1572
1573 err = -EOPNOTSUPP;
1574 if (ops->ndo_set_vf_rate)
1575 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1576 ivf.min_tx_rate,
1577 ivt->rate);
1578 if (err < 0)
1579 return err;
1580 }
1581
1582 if (tb[IFLA_VF_RATE]) {
1583 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1584
1585 err = -EOPNOTSUPP;
1586 if (ops->ndo_set_vf_rate)
1587 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1588 ivt->min_tx_rate,
1589 ivt->max_tx_rate);
1590 if (err < 0)
1591 return err;
1592 }
1593
1594 if (tb[IFLA_VF_SPOOFCHK]) {
1595 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1596
1597 err = -EOPNOTSUPP;
1598 if (ops->ndo_set_vf_spoofchk)
1599 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1600 ivs->setting);
1601 if (err < 0)
1602 return err;
1603 }
1604
1605 if (tb[IFLA_VF_LINK_STATE]) {
1606 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1607
1608 err = -EOPNOTSUPP;
1609 if (ops->ndo_set_vf_link_state)
1610 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1611 ivl->link_state);
1612 if (err < 0)
1613 return err;
1614 }
1615
1616 if (tb[IFLA_VF_RSS_QUERY_EN]) {
1617 struct ifla_vf_rss_query_en *ivrssq_en;
1618
1619 err = -EOPNOTSUPP;
1620 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1621 if (ops->ndo_set_vf_rss_query_en)
1622 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1623 ivrssq_en->setting);
1624 if (err < 0)
1625 return err;
1626 }
1627
1628 if (tb[IFLA_VF_TRUST]) {
1629 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1630
1631 err = -EOPNOTSUPP;
1632 if (ops->ndo_set_vf_trust)
1633 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1634 if (err < 0)
1635 return err;
1636 }
1637
1638 return err;
1639 }
1640
1641 static int do_set_master(struct net_device *dev, int ifindex)
1642 {
1643 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1644 const struct net_device_ops *ops;
1645 int err;
1646
1647 if (upper_dev) {
1648 if (upper_dev->ifindex == ifindex)
1649 return 0;
1650 ops = upper_dev->netdev_ops;
1651 if (ops->ndo_del_slave) {
1652 err = ops->ndo_del_slave(upper_dev, dev);
1653 if (err)
1654 return err;
1655 } else {
1656 return -EOPNOTSUPP;
1657 }
1658 }
1659
1660 if (ifindex) {
1661 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1662 if (!upper_dev)
1663 return -EINVAL;
1664 ops = upper_dev->netdev_ops;
1665 if (ops->ndo_add_slave) {
1666 err = ops->ndo_add_slave(upper_dev, dev);
1667 if (err)
1668 return err;
1669 } else {
1670 return -EOPNOTSUPP;
1671 }
1672 }
1673 return 0;
1674 }
1675
1676 #define DO_SETLINK_MODIFIED 0x01
1677 /* notify flag means notify + modified. */
1678 #define DO_SETLINK_NOTIFY 0x03
1679 static int do_setlink(const struct sk_buff *skb,
1680 struct net_device *dev, struct ifinfomsg *ifm,
1681 struct nlattr **tb, char *ifname, int status)
1682 {
1683 const struct net_device_ops *ops = dev->netdev_ops;
1684 int err;
1685
1686 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1687 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1688 if (IS_ERR(net)) {
1689 err = PTR_ERR(net);
1690 goto errout;
1691 }
1692 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1693 put_net(net);
1694 err = -EPERM;
1695 goto errout;
1696 }
1697 err = dev_change_net_namespace(dev, net, ifname);
1698 put_net(net);
1699 if (err)
1700 goto errout;
1701 status |= DO_SETLINK_MODIFIED;
1702 }
1703
1704 if (tb[IFLA_MAP]) {
1705 struct rtnl_link_ifmap *u_map;
1706 struct ifmap k_map;
1707
1708 if (!ops->ndo_set_config) {
1709 err = -EOPNOTSUPP;
1710 goto errout;
1711 }
1712
1713 if (!netif_device_present(dev)) {
1714 err = -ENODEV;
1715 goto errout;
1716 }
1717
1718 u_map = nla_data(tb[IFLA_MAP]);
1719 k_map.mem_start = (unsigned long) u_map->mem_start;
1720 k_map.mem_end = (unsigned long) u_map->mem_end;
1721 k_map.base_addr = (unsigned short) u_map->base_addr;
1722 k_map.irq = (unsigned char) u_map->irq;
1723 k_map.dma = (unsigned char) u_map->dma;
1724 k_map.port = (unsigned char) u_map->port;
1725
1726 err = ops->ndo_set_config(dev, &k_map);
1727 if (err < 0)
1728 goto errout;
1729
1730 status |= DO_SETLINK_NOTIFY;
1731 }
1732
1733 if (tb[IFLA_ADDRESS]) {
1734 struct sockaddr *sa;
1735 int len;
1736
1737 len = sizeof(sa_family_t) + dev->addr_len;
1738 sa = kmalloc(len, GFP_KERNEL);
1739 if (!sa) {
1740 err = -ENOMEM;
1741 goto errout;
1742 }
1743 sa->sa_family = dev->type;
1744 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1745 dev->addr_len);
1746 err = dev_set_mac_address(dev, sa);
1747 kfree(sa);
1748 if (err)
1749 goto errout;
1750 status |= DO_SETLINK_MODIFIED;
1751 }
1752
1753 if (tb[IFLA_MTU]) {
1754 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1755 if (err < 0)
1756 goto errout;
1757 status |= DO_SETLINK_MODIFIED;
1758 }
1759
1760 if (tb[IFLA_GROUP]) {
1761 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1762 status |= DO_SETLINK_NOTIFY;
1763 }
1764
1765 /*
1766 * Interface selected by interface index but interface
1767 * name provided implies that a name change has been
1768 * requested.
1769 */
1770 if (ifm->ifi_index > 0 && ifname[0]) {
1771 err = dev_change_name(dev, ifname);
1772 if (err < 0)
1773 goto errout;
1774 status |= DO_SETLINK_MODIFIED;
1775 }
1776
1777 if (tb[IFLA_IFALIAS]) {
1778 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1779 nla_len(tb[IFLA_IFALIAS]));
1780 if (err < 0)
1781 goto errout;
1782 status |= DO_SETLINK_NOTIFY;
1783 }
1784
1785 if (tb[IFLA_BROADCAST]) {
1786 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1787 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1788 }
1789
1790 if (ifm->ifi_flags || ifm->ifi_change) {
1791 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1792 if (err < 0)
1793 goto errout;
1794 }
1795
1796 if (tb[IFLA_MASTER]) {
1797 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1798 if (err)
1799 goto errout;
1800 status |= DO_SETLINK_MODIFIED;
1801 }
1802
1803 if (tb[IFLA_CARRIER]) {
1804 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1805 if (err)
1806 goto errout;
1807 status |= DO_SETLINK_MODIFIED;
1808 }
1809
1810 if (tb[IFLA_TXQLEN]) {
1811 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1812
1813 if (dev->tx_queue_len ^ value)
1814 status |= DO_SETLINK_NOTIFY;
1815
1816 dev->tx_queue_len = value;
1817 }
1818
1819 if (tb[IFLA_OPERSTATE])
1820 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1821
1822 if (tb[IFLA_LINKMODE]) {
1823 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1824
1825 write_lock_bh(&dev_base_lock);
1826 if (dev->link_mode ^ value)
1827 status |= DO_SETLINK_NOTIFY;
1828 dev->link_mode = value;
1829 write_unlock_bh(&dev_base_lock);
1830 }
1831
1832 if (tb[IFLA_VFINFO_LIST]) {
1833 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
1834 struct nlattr *attr;
1835 int rem;
1836
1837 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1838 if (nla_type(attr) != IFLA_VF_INFO ||
1839 nla_len(attr) < NLA_HDRLEN) {
1840 err = -EINVAL;
1841 goto errout;
1842 }
1843 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
1844 ifla_vf_policy);
1845 if (err < 0)
1846 goto errout;
1847 err = do_setvfinfo(dev, vfinfo);
1848 if (err < 0)
1849 goto errout;
1850 status |= DO_SETLINK_NOTIFY;
1851 }
1852 }
1853 err = 0;
1854
1855 if (tb[IFLA_VF_PORTS]) {
1856 struct nlattr *port[IFLA_PORT_MAX+1];
1857 struct nlattr *attr;
1858 int vf;
1859 int rem;
1860
1861 err = -EOPNOTSUPP;
1862 if (!ops->ndo_set_vf_port)
1863 goto errout;
1864
1865 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1866 if (nla_type(attr) != IFLA_VF_PORT ||
1867 nla_len(attr) < NLA_HDRLEN) {
1868 err = -EINVAL;
1869 goto errout;
1870 }
1871 err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
1872 ifla_port_policy);
1873 if (err < 0)
1874 goto errout;
1875 if (!port[IFLA_PORT_VF]) {
1876 err = -EOPNOTSUPP;
1877 goto errout;
1878 }
1879 vf = nla_get_u32(port[IFLA_PORT_VF]);
1880 err = ops->ndo_set_vf_port(dev, vf, port);
1881 if (err < 0)
1882 goto errout;
1883 status |= DO_SETLINK_NOTIFY;
1884 }
1885 }
1886 err = 0;
1887
1888 if (tb[IFLA_PORT_SELF]) {
1889 struct nlattr *port[IFLA_PORT_MAX+1];
1890
1891 err = nla_parse_nested(port, IFLA_PORT_MAX,
1892 tb[IFLA_PORT_SELF], ifla_port_policy);
1893 if (err < 0)
1894 goto errout;
1895
1896 err = -EOPNOTSUPP;
1897 if (ops->ndo_set_vf_port)
1898 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1899 if (err < 0)
1900 goto errout;
1901 status |= DO_SETLINK_NOTIFY;
1902 }
1903
1904 if (tb[IFLA_AF_SPEC]) {
1905 struct nlattr *af;
1906 int rem;
1907
1908 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1909 const struct rtnl_af_ops *af_ops;
1910
1911 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1912 BUG();
1913
1914 err = af_ops->set_link_af(dev, af);
1915 if (err < 0)
1916 goto errout;
1917
1918 status |= DO_SETLINK_NOTIFY;
1919 }
1920 }
1921 err = 0;
1922
1923 if (tb[IFLA_PROTO_DOWN]) {
1924 err = dev_change_proto_down(dev,
1925 nla_get_u8(tb[IFLA_PROTO_DOWN]));
1926 if (err)
1927 goto errout;
1928 status |= DO_SETLINK_NOTIFY;
1929 }
1930
1931 errout:
1932 if (status & DO_SETLINK_MODIFIED) {
1933 if (status & DO_SETLINK_NOTIFY)
1934 netdev_state_change(dev);
1935
1936 if (err < 0)
1937 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",
1938 dev->name);
1939 }
1940
1941 return err;
1942 }
1943
1944 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1945 {
1946 struct net *net = sock_net(skb->sk);
1947 struct ifinfomsg *ifm;
1948 struct net_device *dev;
1949 int err;
1950 struct nlattr *tb[IFLA_MAX+1];
1951 char ifname[IFNAMSIZ];
1952
1953 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1954 if (err < 0)
1955 goto errout;
1956
1957 if (tb[IFLA_IFNAME])
1958 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1959 else
1960 ifname[0] = '\0';
1961
1962 err = -EINVAL;
1963 ifm = nlmsg_data(nlh);
1964 if (ifm->ifi_index > 0)
1965 dev = __dev_get_by_index(net, ifm->ifi_index);
1966 else if (tb[IFLA_IFNAME])
1967 dev = __dev_get_by_name(net, ifname);
1968 else
1969 goto errout;
1970
1971 if (dev == NULL) {
1972 err = -ENODEV;
1973 goto errout;
1974 }
1975
1976 err = validate_linkmsg(dev, tb);
1977 if (err < 0)
1978 goto errout;
1979
1980 err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1981 errout:
1982 return err;
1983 }
1984
1985 static int rtnl_group_dellink(const struct net *net, int group)
1986 {
1987 struct net_device *dev, *aux;
1988 LIST_HEAD(list_kill);
1989 bool found = false;
1990
1991 if (!group)
1992 return -EPERM;
1993
1994 for_each_netdev(net, dev) {
1995 if (dev->group == group) {
1996 const struct rtnl_link_ops *ops;
1997
1998 found = true;
1999 ops = dev->rtnl_link_ops;
2000 if (!ops || !ops->dellink)
2001 return -EOPNOTSUPP;
2002 }
2003 }
2004
2005 if (!found)
2006 return -ENODEV;
2007
2008 for_each_netdev_safe(net, dev, aux) {
2009 if (dev->group == group) {
2010 const struct rtnl_link_ops *ops;
2011
2012 ops = dev->rtnl_link_ops;
2013 ops->dellink(dev, &list_kill);
2014 }
2015 }
2016 unregister_netdevice_many(&list_kill);
2017
2018 return 0;
2019 }
2020
2021 int rtnl_delete_link(struct net_device *dev)
2022 {
2023 const struct rtnl_link_ops *ops;
2024 LIST_HEAD(list_kill);
2025
2026 ops = dev->rtnl_link_ops;
2027 if (!ops || !ops->dellink)
2028 return -EOPNOTSUPP;
2029
2030 ops->dellink(dev, &list_kill);
2031 unregister_netdevice_many(&list_kill);
2032
2033 return 0;
2034 }
2035 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2036
2037 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2038 {
2039 struct net *net = sock_net(skb->sk);
2040 struct net_device *dev;
2041 struct ifinfomsg *ifm;
2042 char ifname[IFNAMSIZ];
2043 struct nlattr *tb[IFLA_MAX+1];
2044 int err;
2045
2046 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2047 if (err < 0)
2048 return err;
2049
2050 if (tb[IFLA_IFNAME])
2051 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2052
2053 ifm = nlmsg_data(nlh);
2054 if (ifm->ifi_index > 0)
2055 dev = __dev_get_by_index(net, ifm->ifi_index);
2056 else if (tb[IFLA_IFNAME])
2057 dev = __dev_get_by_name(net, ifname);
2058 else if (tb[IFLA_GROUP])
2059 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2060 else
2061 return -EINVAL;
2062
2063 if (!dev)
2064 return -ENODEV;
2065
2066 return rtnl_delete_link(dev);
2067 }
2068
2069 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2070 {
2071 unsigned int old_flags;
2072 int err;
2073
2074 old_flags = dev->flags;
2075 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2076 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2077 if (err < 0)
2078 return err;
2079 }
2080
2081 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2082
2083 __dev_notify_flags(dev, old_flags, ~0U);
2084 return 0;
2085 }
2086 EXPORT_SYMBOL(rtnl_configure_link);
2087
2088 struct net_device *rtnl_create_link(struct net *net,
2089 const char *ifname, unsigned char name_assign_type,
2090 const struct rtnl_link_ops *ops, struct nlattr *tb[])
2091 {
2092 int err;
2093 struct net_device *dev;
2094 unsigned int num_tx_queues = 1;
2095 unsigned int num_rx_queues = 1;
2096
2097 if (tb[IFLA_NUM_TX_QUEUES])
2098 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2099 else if (ops->get_num_tx_queues)
2100 num_tx_queues = ops->get_num_tx_queues();
2101
2102 if (tb[IFLA_NUM_RX_QUEUES])
2103 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2104 else if (ops->get_num_rx_queues)
2105 num_rx_queues = ops->get_num_rx_queues();
2106
2107 err = -ENOMEM;
2108 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2109 ops->setup, num_tx_queues, num_rx_queues);
2110 if (!dev)
2111 goto err;
2112
2113 dev_net_set(dev, net);
2114 dev->rtnl_link_ops = ops;
2115 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2116
2117 if (tb[IFLA_MTU])
2118 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2119 if (tb[IFLA_ADDRESS]) {
2120 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2121 nla_len(tb[IFLA_ADDRESS]));
2122 dev->addr_assign_type = NET_ADDR_SET;
2123 }
2124 if (tb[IFLA_BROADCAST])
2125 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2126 nla_len(tb[IFLA_BROADCAST]));
2127 if (tb[IFLA_TXQLEN])
2128 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2129 if (tb[IFLA_OPERSTATE])
2130 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2131 if (tb[IFLA_LINKMODE])
2132 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2133 if (tb[IFLA_GROUP])
2134 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2135
2136 return dev;
2137
2138 err:
2139 return ERR_PTR(err);
2140 }
2141 EXPORT_SYMBOL(rtnl_create_link);
2142
2143 static int rtnl_group_changelink(const struct sk_buff *skb,
2144 struct net *net, int group,
2145 struct ifinfomsg *ifm,
2146 struct nlattr **tb)
2147 {
2148 struct net_device *dev, *aux;
2149 int err;
2150
2151 for_each_netdev_safe(net, dev, aux) {
2152 if (dev->group == group) {
2153 err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2154 if (err < 0)
2155 return err;
2156 }
2157 }
2158
2159 return 0;
2160 }
2161
2162 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2163 {
2164 struct net *net = sock_net(skb->sk);
2165 const struct rtnl_link_ops *ops;
2166 const struct rtnl_link_ops *m_ops = NULL;
2167 struct net_device *dev;
2168 struct net_device *master_dev = NULL;
2169 struct ifinfomsg *ifm;
2170 char kind[MODULE_NAME_LEN];
2171 char ifname[IFNAMSIZ];
2172 struct nlattr *tb[IFLA_MAX+1];
2173 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2174 unsigned char name_assign_type = NET_NAME_USER;
2175 int err;
2176
2177 #ifdef CONFIG_MODULES
2178 replay:
2179 #endif
2180 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2181 if (err < 0)
2182 return err;
2183
2184 if (tb[IFLA_IFNAME])
2185 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2186 else
2187 ifname[0] = '\0';
2188
2189 ifm = nlmsg_data(nlh);
2190 if (ifm->ifi_index > 0)
2191 dev = __dev_get_by_index(net, ifm->ifi_index);
2192 else {
2193 if (ifname[0])
2194 dev = __dev_get_by_name(net, ifname);
2195 else
2196 dev = NULL;
2197 }
2198
2199 if (dev) {
2200 master_dev = netdev_master_upper_dev_get(dev);
2201 if (master_dev)
2202 m_ops = master_dev->rtnl_link_ops;
2203 }
2204
2205 err = validate_linkmsg(dev, tb);
2206 if (err < 0)
2207 return err;
2208
2209 if (tb[IFLA_LINKINFO]) {
2210 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2211 tb[IFLA_LINKINFO], ifla_info_policy);
2212 if (err < 0)
2213 return err;
2214 } else
2215 memset(linkinfo, 0, sizeof(linkinfo));
2216
2217 if (linkinfo[IFLA_INFO_KIND]) {
2218 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2219 ops = rtnl_link_ops_get(kind);
2220 } else {
2221 kind[0] = '\0';
2222 ops = NULL;
2223 }
2224
2225 if (1) {
2226 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2227 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2228 struct nlattr **data = NULL;
2229 struct nlattr **slave_data = NULL;
2230 struct net *dest_net, *link_net = NULL;
2231
2232 if (ops) {
2233 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2234 err = nla_parse_nested(attr, ops->maxtype,
2235 linkinfo[IFLA_INFO_DATA],
2236 ops->policy);
2237 if (err < 0)
2238 return err;
2239 data = attr;
2240 }
2241 if (ops->validate) {
2242 err = ops->validate(tb, data);
2243 if (err < 0)
2244 return err;
2245 }
2246 }
2247
2248 if (m_ops) {
2249 if (m_ops->slave_maxtype &&
2250 linkinfo[IFLA_INFO_SLAVE_DATA]) {
2251 err = nla_parse_nested(slave_attr,
2252 m_ops->slave_maxtype,
2253 linkinfo[IFLA_INFO_SLAVE_DATA],
2254 m_ops->slave_policy);
2255 if (err < 0)
2256 return err;
2257 slave_data = slave_attr;
2258 }
2259 if (m_ops->slave_validate) {
2260 err = m_ops->slave_validate(tb, slave_data);
2261 if (err < 0)
2262 return err;
2263 }
2264 }
2265
2266 if (dev) {
2267 int status = 0;
2268
2269 if (nlh->nlmsg_flags & NLM_F_EXCL)
2270 return -EEXIST;
2271 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2272 return -EOPNOTSUPP;
2273
2274 if (linkinfo[IFLA_INFO_DATA]) {
2275 if (!ops || ops != dev->rtnl_link_ops ||
2276 !ops->changelink)
2277 return -EOPNOTSUPP;
2278
2279 err = ops->changelink(dev, tb, data);
2280 if (err < 0)
2281 return err;
2282 status |= DO_SETLINK_NOTIFY;
2283 }
2284
2285 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2286 if (!m_ops || !m_ops->slave_changelink)
2287 return -EOPNOTSUPP;
2288
2289 err = m_ops->slave_changelink(master_dev, dev,
2290 tb, slave_data);
2291 if (err < 0)
2292 return err;
2293 status |= DO_SETLINK_NOTIFY;
2294 }
2295
2296 return do_setlink(skb, dev, ifm, tb, ifname, status);
2297 }
2298
2299 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2300 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2301 return rtnl_group_changelink(skb, net,
2302 nla_get_u32(tb[IFLA_GROUP]),
2303 ifm, tb);
2304 return -ENODEV;
2305 }
2306
2307 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2308 return -EOPNOTSUPP;
2309
2310 if (!ops) {
2311 #ifdef CONFIG_MODULES
2312 if (kind[0]) {
2313 __rtnl_unlock();
2314 request_module("rtnl-link-%s", kind);
2315 rtnl_lock();
2316 ops = rtnl_link_ops_get(kind);
2317 if (ops)
2318 goto replay;
2319 }
2320 #endif
2321 return -EOPNOTSUPP;
2322 }
2323
2324 if (!ops->setup)
2325 return -EOPNOTSUPP;
2326
2327 if (!ifname[0]) {
2328 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2329 name_assign_type = NET_NAME_ENUM;
2330 }
2331
2332 dest_net = rtnl_link_get_net(net, tb);
2333 if (IS_ERR(dest_net))
2334 return PTR_ERR(dest_net);
2335
2336 err = -EPERM;
2337 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2338 goto out;
2339
2340 if (tb[IFLA_LINK_NETNSID]) {
2341 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2342
2343 link_net = get_net_ns_by_id(dest_net, id);
2344 if (!link_net) {
2345 err = -EINVAL;
2346 goto out;
2347 }
2348 err = -EPERM;
2349 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2350 goto out;
2351 }
2352
2353 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2354 name_assign_type, ops, tb);
2355 if (IS_ERR(dev)) {
2356 err = PTR_ERR(dev);
2357 goto out;
2358 }
2359
2360 dev->ifindex = ifm->ifi_index;
2361
2362 if (ops->newlink) {
2363 err = ops->newlink(link_net ? : net, dev, tb, data);
2364 /* Drivers should call free_netdev() in ->destructor
2365 * and unregister it on failure after registration
2366 * so that device could be finally freed in rtnl_unlock.
2367 */
2368 if (err < 0) {
2369 /* If device is not registered at all, free it now */
2370 if (dev->reg_state == NETREG_UNINITIALIZED)
2371 free_netdev(dev);
2372 goto out;
2373 }
2374 } else {
2375 err = register_netdevice(dev);
2376 if (err < 0) {
2377 free_netdev(dev);
2378 goto out;
2379 }
2380 }
2381 err = rtnl_configure_link(dev, ifm);
2382 if (err < 0)
2383 goto out_unregister;
2384 if (link_net) {
2385 err = dev_change_net_namespace(dev, dest_net, ifname);
2386 if (err < 0)
2387 goto out_unregister;
2388 }
2389 out:
2390 if (link_net)
2391 put_net(link_net);
2392 put_net(dest_net);
2393 return err;
2394 out_unregister:
2395 if (ops->newlink) {
2396 LIST_HEAD(list_kill);
2397
2398 ops->dellink(dev, &list_kill);
2399 unregister_netdevice_many(&list_kill);
2400 } else {
2401 unregister_netdevice(dev);
2402 }
2403 goto out;
2404 }
2405 }
2406
2407 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2408 {
2409 struct net *net = sock_net(skb->sk);
2410 struct ifinfomsg *ifm;
2411 char ifname[IFNAMSIZ];
2412 struct nlattr *tb[IFLA_MAX+1];
2413 struct net_device *dev = NULL;
2414 struct sk_buff *nskb;
2415 int err;
2416 u32 ext_filter_mask = 0;
2417
2418 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2419 if (err < 0)
2420 return err;
2421
2422 if (tb[IFLA_IFNAME])
2423 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2424
2425 if (tb[IFLA_EXT_MASK])
2426 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2427
2428 ifm = nlmsg_data(nlh);
2429 if (ifm->ifi_index > 0)
2430 dev = __dev_get_by_index(net, ifm->ifi_index);
2431 else if (tb[IFLA_IFNAME])
2432 dev = __dev_get_by_name(net, ifname);
2433 else
2434 return -EINVAL;
2435
2436 if (dev == NULL)
2437 return -ENODEV;
2438
2439 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2440 if (nskb == NULL)
2441 return -ENOBUFS;
2442
2443 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2444 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2445 if (err < 0) {
2446 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2447 WARN_ON(err == -EMSGSIZE);
2448 kfree_skb(nskb);
2449 } else
2450 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2451
2452 return err;
2453 }
2454
2455 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2456 {
2457 struct net *net = sock_net(skb->sk);
2458 struct net_device *dev;
2459 struct nlattr *tb[IFLA_MAX+1];
2460 u32 ext_filter_mask = 0;
2461 u16 min_ifinfo_dump_size = 0;
2462 int hdrlen;
2463
2464 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2465 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2466 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2467
2468 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2469 if (tb[IFLA_EXT_MASK])
2470 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2471 }
2472
2473 if (!ext_filter_mask)
2474 return NLMSG_GOODSIZE;
2475 /*
2476 * traverse the list of net devices and compute the minimum
2477 * buffer size based upon the filter mask.
2478 */
2479 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2480 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2481 if_nlmsg_size(dev,
2482 ext_filter_mask));
2483 }
2484
2485 return min_ifinfo_dump_size;
2486 }
2487
2488 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2489 {
2490 int idx;
2491 int s_idx = cb->family;
2492
2493 if (s_idx == 0)
2494 s_idx = 1;
2495 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2496 int type = cb->nlh->nlmsg_type-RTM_BASE;
2497 if (idx < s_idx || idx == PF_PACKET)
2498 continue;
2499 if (rtnl_msg_handlers[idx] == NULL ||
2500 rtnl_msg_handlers[idx][type].dumpit == NULL)
2501 continue;
2502 if (idx > s_idx) {
2503 memset(&cb->args[0], 0, sizeof(cb->args));
2504 cb->prev_seq = 0;
2505 cb->seq = 0;
2506 }
2507 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2508 break;
2509 }
2510 cb->family = idx;
2511
2512 return skb->len;
2513 }
2514
2515 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2516 unsigned int change, gfp_t flags)
2517 {
2518 struct net *net = dev_net(dev);
2519 struct sk_buff *skb;
2520 int err = -ENOBUFS;
2521 size_t if_info_size;
2522
2523 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2524 if (skb == NULL)
2525 goto errout;
2526
2527 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2528 if (err < 0) {
2529 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2530 WARN_ON(err == -EMSGSIZE);
2531 kfree_skb(skb);
2532 goto errout;
2533 }
2534 return skb;
2535 errout:
2536 if (err < 0)
2537 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2538 return NULL;
2539 }
2540
2541 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2542 {
2543 struct net *net = dev_net(dev);
2544
2545 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2546 }
2547
2548 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2549 gfp_t flags)
2550 {
2551 struct sk_buff *skb;
2552
2553 if (dev->reg_state != NETREG_REGISTERED)
2554 return;
2555
2556 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2557 if (skb)
2558 rtmsg_ifinfo_send(skb, dev, flags);
2559 }
2560 EXPORT_SYMBOL(rtmsg_ifinfo);
2561
2562 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2563 struct net_device *dev,
2564 u8 *addr, u16 vid, u32 pid, u32 seq,
2565 int type, unsigned int flags,
2566 int nlflags)
2567 {
2568 struct nlmsghdr *nlh;
2569 struct ndmsg *ndm;
2570
2571 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2572 if (!nlh)
2573 return -EMSGSIZE;
2574
2575 ndm = nlmsg_data(nlh);
2576 ndm->ndm_family = AF_BRIDGE;
2577 ndm->ndm_pad1 = 0;
2578 ndm->ndm_pad2 = 0;
2579 ndm->ndm_flags = flags;
2580 ndm->ndm_type = 0;
2581 ndm->ndm_ifindex = dev->ifindex;
2582 ndm->ndm_state = NUD_PERMANENT;
2583
2584 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2585 goto nla_put_failure;
2586 if (vid)
2587 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2588 goto nla_put_failure;
2589
2590 nlmsg_end(skb, nlh);
2591 return 0;
2592
2593 nla_put_failure:
2594 nlmsg_cancel(skb, nlh);
2595 return -EMSGSIZE;
2596 }
2597
2598 static inline size_t rtnl_fdb_nlmsg_size(void)
2599 {
2600 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2601 }
2602
2603 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type)
2604 {
2605 struct net *net = dev_net(dev);
2606 struct sk_buff *skb;
2607 int err = -ENOBUFS;
2608
2609 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2610 if (!skb)
2611 goto errout;
2612
2613 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2614 0, 0, type, NTF_SELF, 0);
2615 if (err < 0) {
2616 kfree_skb(skb);
2617 goto errout;
2618 }
2619
2620 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2621 return;
2622 errout:
2623 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2624 }
2625
2626 /**
2627 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2628 */
2629 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2630 struct nlattr *tb[],
2631 struct net_device *dev,
2632 const unsigned char *addr, u16 vid,
2633 u16 flags)
2634 {
2635 int err = -EINVAL;
2636
2637 /* If aging addresses are supported device will need to
2638 * implement its own handler for this.
2639 */
2640 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2641 pr_info("%s: FDB only supports static addresses\n", dev->name);
2642 return err;
2643 }
2644
2645 if (vid) {
2646 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2647 return err;
2648 }
2649
2650 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2651 err = dev_uc_add_excl(dev, addr);
2652 else if (is_multicast_ether_addr(addr))
2653 err = dev_mc_add_excl(dev, addr);
2654
2655 /* Only return duplicate errors if NLM_F_EXCL is set */
2656 if (err == -EEXIST && !(flags & NLM_F_EXCL))
2657 err = 0;
2658
2659 return err;
2660 }
2661 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2662
2663 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2664 {
2665 u16 vid = 0;
2666
2667 if (vlan_attr) {
2668 if (nla_len(vlan_attr) != sizeof(u16)) {
2669 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2670 return -EINVAL;
2671 }
2672
2673 vid = nla_get_u16(vlan_attr);
2674
2675 if (!vid || vid >= VLAN_VID_MASK) {
2676 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2677 vid);
2678 return -EINVAL;
2679 }
2680 }
2681 *p_vid = vid;
2682 return 0;
2683 }
2684
2685 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2686 {
2687 struct net *net = sock_net(skb->sk);
2688 struct ndmsg *ndm;
2689 struct nlattr *tb[NDA_MAX+1];
2690 struct net_device *dev;
2691 u8 *addr;
2692 u16 vid;
2693 int err;
2694
2695 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2696 if (err < 0)
2697 return err;
2698
2699 ndm = nlmsg_data(nlh);
2700 if (ndm->ndm_ifindex == 0) {
2701 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2702 return -EINVAL;
2703 }
2704
2705 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2706 if (dev == NULL) {
2707 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2708 return -ENODEV;
2709 }
2710
2711 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2712 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2713 return -EINVAL;
2714 }
2715
2716 addr = nla_data(tb[NDA_LLADDR]);
2717
2718 err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2719 if (err)
2720 return err;
2721
2722 err = -EOPNOTSUPP;
2723
2724 /* Support fdb on master device the net/bridge default case */
2725 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2726 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2727 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2728 const struct net_device_ops *ops = br_dev->netdev_ops;
2729
2730 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2731 nlh->nlmsg_flags);
2732 if (err)
2733 goto out;
2734 else
2735 ndm->ndm_flags &= ~NTF_MASTER;
2736 }
2737
2738 /* Embedded bridge, macvlan, and any other device support */
2739 if ((ndm->ndm_flags & NTF_SELF)) {
2740 if (dev->netdev_ops->ndo_fdb_add)
2741 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2742 vid,
2743 nlh->nlmsg_flags);
2744 else
2745 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2746 nlh->nlmsg_flags);
2747
2748 if (!err) {
2749 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH);
2750 ndm->ndm_flags &= ~NTF_SELF;
2751 }
2752 }
2753 out:
2754 return err;
2755 }
2756
2757 /**
2758 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2759 */
2760 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2761 struct nlattr *tb[],
2762 struct net_device *dev,
2763 const unsigned char *addr, u16 vid)
2764 {
2765 int err = -EINVAL;
2766
2767 /* If aging addresses are supported device will need to
2768 * implement its own handler for this.
2769 */
2770 if (!(ndm->ndm_state & NUD_PERMANENT)) {
2771 pr_info("%s: FDB only supports static addresses\n", dev->name);
2772 return err;
2773 }
2774
2775 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2776 err = dev_uc_del(dev, addr);
2777 else if (is_multicast_ether_addr(addr))
2778 err = dev_mc_del(dev, addr);
2779
2780 return err;
2781 }
2782 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2783
2784 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2785 {
2786 struct net *net = sock_net(skb->sk);
2787 struct ndmsg *ndm;
2788 struct nlattr *tb[NDA_MAX+1];
2789 struct net_device *dev;
2790 int err = -EINVAL;
2791 __u8 *addr;
2792 u16 vid;
2793
2794 if (!netlink_capable(skb, CAP_NET_ADMIN))
2795 return -EPERM;
2796
2797 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2798 if (err < 0)
2799 return err;
2800
2801 ndm = nlmsg_data(nlh);
2802 if (ndm->ndm_ifindex == 0) {
2803 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2804 return -EINVAL;
2805 }
2806
2807 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2808 if (dev == NULL) {
2809 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2810 return -ENODEV;
2811 }
2812
2813 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2814 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2815 return -EINVAL;
2816 }
2817
2818 addr = nla_data(tb[NDA_LLADDR]);
2819
2820 err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2821 if (err)
2822 return err;
2823
2824 err = -EOPNOTSUPP;
2825
2826 /* Support fdb on master device the net/bridge default case */
2827 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2828 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2829 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2830 const struct net_device_ops *ops = br_dev->netdev_ops;
2831
2832 if (ops->ndo_fdb_del)
2833 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
2834
2835 if (err)
2836 goto out;
2837 else
2838 ndm->ndm_flags &= ~NTF_MASTER;
2839 }
2840
2841 /* Embedded bridge, macvlan, and any other device support */
2842 if (ndm->ndm_flags & NTF_SELF) {
2843 if (dev->netdev_ops->ndo_fdb_del)
2844 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
2845 vid);
2846 else
2847 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
2848
2849 if (!err) {
2850 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH);
2851 ndm->ndm_flags &= ~NTF_SELF;
2852 }
2853 }
2854 out:
2855 return err;
2856 }
2857
2858 static int nlmsg_populate_fdb(struct sk_buff *skb,
2859 struct netlink_callback *cb,
2860 struct net_device *dev,
2861 int *idx,
2862 struct netdev_hw_addr_list *list)
2863 {
2864 struct netdev_hw_addr *ha;
2865 int err;
2866 u32 portid, seq;
2867
2868 portid = NETLINK_CB(cb->skb).portid;
2869 seq = cb->nlh->nlmsg_seq;
2870
2871 list_for_each_entry(ha, &list->list, list) {
2872 if (*idx < cb->args[0])
2873 goto skip;
2874
2875 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
2876 portid, seq,
2877 RTM_NEWNEIGH, NTF_SELF,
2878 NLM_F_MULTI);
2879 if (err < 0)
2880 return err;
2881 skip:
2882 *idx += 1;
2883 }
2884 return 0;
2885 }
2886
2887 /**
2888 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2889 * @nlh: netlink message header
2890 * @dev: netdevice
2891 *
2892 * Default netdevice operation to dump the existing unicast address list.
2893 * Returns number of addresses from list put in skb.
2894 */
2895 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2896 struct netlink_callback *cb,
2897 struct net_device *dev,
2898 struct net_device *filter_dev,
2899 int idx)
2900 {
2901 int err;
2902
2903 netif_addr_lock_bh(dev);
2904 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2905 if (err)
2906 goto out;
2907 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2908 out:
2909 netif_addr_unlock_bh(dev);
2910 return idx;
2911 }
2912 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2913
2914 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2915 {
2916 struct net_device *dev;
2917 struct nlattr *tb[IFLA_MAX+1];
2918 struct net_device *br_dev = NULL;
2919 const struct net_device_ops *ops = NULL;
2920 const struct net_device_ops *cops = NULL;
2921 struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2922 struct net *net = sock_net(skb->sk);
2923 int brport_idx = 0;
2924 int br_idx = 0;
2925 int idx = 0;
2926
2927 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2928 ifla_policy) == 0) {
2929 if (tb[IFLA_MASTER])
2930 br_idx = nla_get_u32(tb[IFLA_MASTER]);
2931 }
2932
2933 brport_idx = ifm->ifi_index;
2934
2935 if (br_idx) {
2936 br_dev = __dev_get_by_index(net, br_idx);
2937 if (!br_dev)
2938 return -ENODEV;
2939
2940 ops = br_dev->netdev_ops;
2941 }
2942
2943 for_each_netdev(net, dev) {
2944 if (brport_idx && (dev->ifindex != brport_idx))
2945 continue;
2946
2947 if (!br_idx) { /* user did not specify a specific bridge */
2948 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2949 br_dev = netdev_master_upper_dev_get(dev);
2950 cops = br_dev->netdev_ops;
2951 }
2952
2953 } else {
2954 if (dev != br_dev &&
2955 !(dev->priv_flags & IFF_BRIDGE_PORT))
2956 continue;
2957
2958 if (br_dev != netdev_master_upper_dev_get(dev) &&
2959 !(dev->priv_flags & IFF_EBRIDGE))
2960 continue;
2961
2962 cops = ops;
2963 }
2964
2965 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2966 if (cops && cops->ndo_fdb_dump)
2967 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2968 idx);
2969 }
2970
2971 if (dev->netdev_ops->ndo_fdb_dump)
2972 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
2973 idx);
2974 else
2975 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2976
2977 cops = NULL;
2978 }
2979
2980 cb->args[0] = idx;
2981 return skb->len;
2982 }
2983
2984 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
2985 unsigned int attrnum, unsigned int flag)
2986 {
2987 if (mask & flag)
2988 return nla_put_u8(skb, attrnum, !!(flags & flag));
2989 return 0;
2990 }
2991
2992 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2993 struct net_device *dev, u16 mode,
2994 u32 flags, u32 mask, int nlflags,
2995 u32 filter_mask,
2996 int (*vlan_fill)(struct sk_buff *skb,
2997 struct net_device *dev,
2998 u32 filter_mask))
2999 {
3000 struct nlmsghdr *nlh;
3001 struct ifinfomsg *ifm;
3002 struct nlattr *br_afspec;
3003 struct nlattr *protinfo;
3004 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3005 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3006 int err = 0;
3007
3008 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3009 if (nlh == NULL)
3010 return -EMSGSIZE;
3011
3012 ifm = nlmsg_data(nlh);
3013 ifm->ifi_family = AF_BRIDGE;
3014 ifm->__ifi_pad = 0;
3015 ifm->ifi_type = dev->type;
3016 ifm->ifi_index = dev->ifindex;
3017 ifm->ifi_flags = dev_get_flags(dev);
3018 ifm->ifi_change = 0;
3019
3020
3021 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3022 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3023 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3024 (br_dev &&
3025 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3026 (dev->addr_len &&
3027 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3028 (dev->ifindex != dev_get_iflink(dev) &&
3029 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3030 goto nla_put_failure;
3031
3032 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3033 if (!br_afspec)
3034 goto nla_put_failure;
3035
3036 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3037 nla_nest_cancel(skb, br_afspec);
3038 goto nla_put_failure;
3039 }
3040
3041 if (mode != BRIDGE_MODE_UNDEF) {
3042 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3043 nla_nest_cancel(skb, br_afspec);
3044 goto nla_put_failure;
3045 }
3046 }
3047 if (vlan_fill) {
3048 err = vlan_fill(skb, dev, filter_mask);
3049 if (err) {
3050 nla_nest_cancel(skb, br_afspec);
3051 goto nla_put_failure;
3052 }
3053 }
3054 nla_nest_end(skb, br_afspec);
3055
3056 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3057 if (!protinfo)
3058 goto nla_put_failure;
3059
3060 if (brport_nla_put_flag(skb, flags, mask,
3061 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3062 brport_nla_put_flag(skb, flags, mask,
3063 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3064 brport_nla_put_flag(skb, flags, mask,
3065 IFLA_BRPORT_FAST_LEAVE,
3066 BR_MULTICAST_FAST_LEAVE) ||
3067 brport_nla_put_flag(skb, flags, mask,
3068 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3069 brport_nla_put_flag(skb, flags, mask,
3070 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3071 brport_nla_put_flag(skb, flags, mask,
3072 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3073 brport_nla_put_flag(skb, flags, mask,
3074 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3075 brport_nla_put_flag(skb, flags, mask,
3076 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3077 nla_nest_cancel(skb, protinfo);
3078 goto nla_put_failure;
3079 }
3080
3081 nla_nest_end(skb, protinfo);
3082
3083 nlmsg_end(skb, nlh);
3084 return 0;
3085 nla_put_failure:
3086 nlmsg_cancel(skb, nlh);
3087 return err ? err : -EMSGSIZE;
3088 }
3089 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3090
3091 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3092 {
3093 struct net *net = sock_net(skb->sk);
3094 struct net_device *dev;
3095 int idx = 0;
3096 u32 portid = NETLINK_CB(cb->skb).portid;
3097 u32 seq = cb->nlh->nlmsg_seq;
3098 u32 filter_mask = 0;
3099 int err;
3100
3101 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3102 struct nlattr *extfilt;
3103
3104 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3105 IFLA_EXT_MASK);
3106 if (extfilt) {
3107 if (nla_len(extfilt) < sizeof(filter_mask))
3108 return -EINVAL;
3109
3110 filter_mask = nla_get_u32(extfilt);
3111 }
3112 }
3113
3114 rcu_read_lock();
3115 for_each_netdev_rcu(net, dev) {
3116 const struct net_device_ops *ops = dev->netdev_ops;
3117 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3118
3119 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3120 if (idx >= cb->args[0]) {
3121 err = br_dev->netdev_ops->ndo_bridge_getlink(
3122 skb, portid, seq, dev,
3123 filter_mask, NLM_F_MULTI);
3124 if (err < 0 && err != -EOPNOTSUPP)
3125 break;
3126 }
3127 idx++;
3128 }
3129
3130 if (ops->ndo_bridge_getlink) {
3131 if (idx >= cb->args[0]) {
3132 err = ops->ndo_bridge_getlink(skb, portid,
3133 seq, dev,
3134 filter_mask,
3135 NLM_F_MULTI);
3136 if (err < 0 && err != -EOPNOTSUPP)
3137 break;
3138 }
3139 idx++;
3140 }
3141 }
3142 rcu_read_unlock();
3143 cb->args[0] = idx;
3144
3145 return skb->len;
3146 }
3147
3148 static inline size_t bridge_nlmsg_size(void)
3149 {
3150 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3151 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3152 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3153 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
3154 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
3155 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
3156 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
3157 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
3158 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3159 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
3160 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
3161 }
3162
3163 static int rtnl_bridge_notify(struct net_device *dev)
3164 {
3165 struct net *net = dev_net(dev);
3166 struct sk_buff *skb;
3167 int err = -EOPNOTSUPP;
3168
3169 if (!dev->netdev_ops->ndo_bridge_getlink)
3170 return 0;
3171
3172 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3173 if (!skb) {
3174 err = -ENOMEM;
3175 goto errout;
3176 }
3177
3178 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3179 if (err < 0)
3180 goto errout;
3181
3182 if (!skb->len)
3183 goto errout;
3184
3185 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3186 return 0;
3187 errout:
3188 WARN_ON(err == -EMSGSIZE);
3189 kfree_skb(skb);
3190 if (err)
3191 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3192 return err;
3193 }
3194
3195 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3196 {
3197 struct net *net = sock_net(skb->sk);
3198 struct ifinfomsg *ifm;
3199 struct net_device *dev;
3200 struct nlattr *br_spec, *attr = NULL;
3201 int rem, err = -EOPNOTSUPP;
3202 u16 flags = 0;
3203 bool have_flags = false;
3204
3205 if (nlmsg_len(nlh) < sizeof(*ifm))
3206 return -EINVAL;
3207
3208 ifm = nlmsg_data(nlh);
3209 if (ifm->ifi_family != AF_BRIDGE)
3210 return -EPFNOSUPPORT;
3211
3212 dev = __dev_get_by_index(net, ifm->ifi_index);
3213 if (!dev) {
3214 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3215 return -ENODEV;
3216 }
3217
3218 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3219 if (br_spec) {
3220 nla_for_each_nested(attr, br_spec, rem) {
3221 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3222 if (nla_len(attr) < sizeof(flags))
3223 return -EINVAL;
3224
3225 have_flags = true;
3226 flags = nla_get_u16(attr);
3227 break;
3228 }
3229 }
3230 }
3231
3232 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3233 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3234
3235 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3236 err = -EOPNOTSUPP;
3237 goto out;
3238 }
3239
3240 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3241 if (err)
3242 goto out;
3243
3244 flags &= ~BRIDGE_FLAGS_MASTER;
3245 }
3246
3247 if ((flags & BRIDGE_FLAGS_SELF)) {
3248 if (!dev->netdev_ops->ndo_bridge_setlink)
3249 err = -EOPNOTSUPP;
3250 else
3251 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3252 flags);
3253 if (!err) {
3254 flags &= ~BRIDGE_FLAGS_SELF;
3255
3256 /* Generate event to notify upper layer of bridge
3257 * change
3258 */
3259 err = rtnl_bridge_notify(dev);
3260 }
3261 }
3262
3263 if (have_flags)
3264 memcpy(nla_data(attr), &flags, sizeof(flags));
3265 out:
3266 return err;
3267 }
3268
3269 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3270 {
3271 struct net *net = sock_net(skb->sk);
3272 struct ifinfomsg *ifm;
3273 struct net_device *dev;
3274 struct nlattr *br_spec, *attr = NULL;
3275 int rem, err = -EOPNOTSUPP;
3276 u16 flags = 0;
3277 bool have_flags = false;
3278
3279 if (nlmsg_len(nlh) < sizeof(*ifm))
3280 return -EINVAL;
3281
3282 ifm = nlmsg_data(nlh);
3283 if (ifm->ifi_family != AF_BRIDGE)
3284 return -EPFNOSUPPORT;
3285
3286 dev = __dev_get_by_index(net, ifm->ifi_index);
3287 if (!dev) {
3288 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3289 return -ENODEV;
3290 }
3291
3292 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3293 if (br_spec) {
3294 nla_for_each_nested(attr, br_spec, rem) {
3295 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3296 if (nla_len(attr) < sizeof(flags))
3297 return -EINVAL;
3298
3299 have_flags = true;
3300 flags = nla_get_u16(attr);
3301 break;
3302 }
3303 }
3304 }
3305
3306 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3307 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3308
3309 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3310 err = -EOPNOTSUPP;
3311 goto out;
3312 }
3313
3314 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3315 if (err)
3316 goto out;
3317
3318 flags &= ~BRIDGE_FLAGS_MASTER;
3319 }
3320
3321 if ((flags & BRIDGE_FLAGS_SELF)) {
3322 if (!dev->netdev_ops->ndo_bridge_dellink)
3323 err = -EOPNOTSUPP;
3324 else
3325 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3326 flags);
3327
3328 if (!err) {
3329 flags &= ~BRIDGE_FLAGS_SELF;
3330
3331 /* Generate event to notify upper layer of bridge
3332 * change
3333 */
3334 err = rtnl_bridge_notify(dev);
3335 }
3336 }
3337
3338 if (have_flags)
3339 memcpy(nla_data(attr), &flags, sizeof(flags));
3340 out:
3341 return err;
3342 }
3343
3344 /* Process one rtnetlink message. */
3345
3346 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3347 {
3348 struct net *net = sock_net(skb->sk);
3349 rtnl_doit_func doit;
3350 int sz_idx, kind;
3351 int family;
3352 int type;
3353 int err;
3354
3355 type = nlh->nlmsg_type;
3356 if (type > RTM_MAX)
3357 return -EOPNOTSUPP;
3358
3359 type -= RTM_BASE;
3360
3361 /* All the messages must have at least 1 byte length */
3362 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3363 return 0;
3364
3365 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3366 sz_idx = type>>2;
3367 kind = type&3;
3368
3369 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3370 return -EPERM;
3371
3372 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3373 struct sock *rtnl;
3374 rtnl_dumpit_func dumpit;
3375 rtnl_calcit_func calcit;
3376 u16 min_dump_alloc = 0;
3377
3378 dumpit = rtnl_get_dumpit(family, type);
3379 if (dumpit == NULL)
3380 return -EOPNOTSUPP;
3381 calcit = rtnl_get_calcit(family, type);
3382 if (calcit)
3383 min_dump_alloc = calcit(skb, nlh);
3384
3385 __rtnl_unlock();
3386 rtnl = net->rtnl;
3387 {
3388 struct netlink_dump_control c = {
3389 .dump = dumpit,
3390 .min_dump_alloc = min_dump_alloc,
3391 };
3392 err = netlink_dump_start(rtnl, skb, nlh, &c);
3393 }
3394 rtnl_lock();
3395 return err;
3396 }
3397
3398 doit = rtnl_get_doit(family, type);
3399 if (doit == NULL)
3400 return -EOPNOTSUPP;
3401
3402 return doit(skb, nlh);
3403 }
3404
3405 static void rtnetlink_rcv(struct sk_buff *skb)
3406 {
3407 rtnl_lock();
3408 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3409 rtnl_unlock();
3410 }
3411
3412 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3413 {
3414 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3415
3416 switch (event) {
3417 case NETDEV_UP:
3418 case NETDEV_DOWN:
3419 case NETDEV_PRE_UP:
3420 case NETDEV_POST_INIT:
3421 case NETDEV_REGISTER:
3422 case NETDEV_CHANGE:
3423 case NETDEV_PRE_TYPE_CHANGE:
3424 case NETDEV_GOING_DOWN:
3425 case NETDEV_UNREGISTER:
3426 case NETDEV_UNREGISTER_FINAL:
3427 case NETDEV_RELEASE:
3428 case NETDEV_JOIN:
3429 case NETDEV_BONDING_INFO:
3430 break;
3431 default:
3432 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3433 break;
3434 }
3435 return NOTIFY_DONE;
3436 }
3437
3438 static struct notifier_block rtnetlink_dev_notifier = {
3439 .notifier_call = rtnetlink_event,
3440 };
3441
3442
3443 static int __net_init rtnetlink_net_init(struct net *net)
3444 {
3445 struct sock *sk;
3446 struct netlink_kernel_cfg cfg = {
3447 .groups = RTNLGRP_MAX,
3448 .input = rtnetlink_rcv,
3449 .cb_mutex = &rtnl_mutex,
3450 .flags = NL_CFG_F_NONROOT_RECV,
3451 };
3452
3453 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3454 if (!sk)
3455 return -ENOMEM;
3456 net->rtnl = sk;
3457 return 0;
3458 }
3459
3460 static void __net_exit rtnetlink_net_exit(struct net *net)
3461 {
3462 netlink_kernel_release(net->rtnl);
3463 net->rtnl = NULL;
3464 }
3465
3466 static struct pernet_operations rtnetlink_net_ops = {
3467 .init = rtnetlink_net_init,
3468 .exit = rtnetlink_net_exit,
3469 };
3470
3471 void __init rtnetlink_init(void)
3472 {
3473 if (register_pernet_subsys(&rtnetlink_net_ops))
3474 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3475
3476 register_netdevice_notifier(&rtnetlink_dev_notifier);
3477
3478 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3479 rtnl_dump_ifinfo, rtnl_calcit);
3480 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3481 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3482 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3483
3484 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3485 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3486
3487 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3488 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3489 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3490
3491 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3492 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3493 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3494 }
Linux kernel - Deliverables
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