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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[mirror_ubuntu-artful-kernel.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/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 int 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 {
502 struct rtnl_af_ops *af_ops;
503 size_t size;
504
505 /* IFLA_AF_SPEC */
506 size = nla_total_size(sizeof(struct nlattr));
507
508 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
509 if (af_ops->get_link_af_size) {
510 /* AF_* + nested data */
511 size += nla_total_size(sizeof(struct nlattr)) +
512 af_ops->get_link_af_size(dev);
513 }
514 }
515
516 return size;
517 }
518
519 static bool rtnl_have_link_slave_info(const struct net_device *dev)
520 {
521 struct net_device *master_dev;
522
523 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
524 if (master_dev && master_dev->rtnl_link_ops)
525 return true;
526 return false;
527 }
528
529 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
530 const struct net_device *dev)
531 {
532 struct net_device *master_dev;
533 const struct rtnl_link_ops *ops;
534 struct nlattr *slave_data;
535 int err;
536
537 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
538 if (!master_dev)
539 return 0;
540 ops = master_dev->rtnl_link_ops;
541 if (!ops)
542 return 0;
543 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
544 return -EMSGSIZE;
545 if (ops->fill_slave_info) {
546 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
547 if (!slave_data)
548 return -EMSGSIZE;
549 err = ops->fill_slave_info(skb, master_dev, dev);
550 if (err < 0)
551 goto err_cancel_slave_data;
552 nla_nest_end(skb, slave_data);
553 }
554 return 0;
555
556 err_cancel_slave_data:
557 nla_nest_cancel(skb, slave_data);
558 return err;
559 }
560
561 static int rtnl_link_info_fill(struct sk_buff *skb,
562 const struct net_device *dev)
563 {
564 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
565 struct nlattr *data;
566 int err;
567
568 if (!ops)
569 return 0;
570 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
571 return -EMSGSIZE;
572 if (ops->fill_xstats) {
573 err = ops->fill_xstats(skb, dev);
574 if (err < 0)
575 return err;
576 }
577 if (ops->fill_info) {
578 data = nla_nest_start(skb, IFLA_INFO_DATA);
579 if (data == NULL)
580 return -EMSGSIZE;
581 err = ops->fill_info(skb, dev);
582 if (err < 0)
583 goto err_cancel_data;
584 nla_nest_end(skb, data);
585 }
586 return 0;
587
588 err_cancel_data:
589 nla_nest_cancel(skb, data);
590 return err;
591 }
592
593 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
594 {
595 struct nlattr *linkinfo;
596 int err = -EMSGSIZE;
597
598 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
599 if (linkinfo == NULL)
600 goto out;
601
602 err = rtnl_link_info_fill(skb, dev);
603 if (err < 0)
604 goto err_cancel_link;
605
606 err = rtnl_link_slave_info_fill(skb, dev);
607 if (err < 0)
608 goto err_cancel_link;
609
610 nla_nest_end(skb, linkinfo);
611 return 0;
612
613 err_cancel_link:
614 nla_nest_cancel(skb, linkinfo);
615 out:
616 return err;
617 }
618
619 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
620 {
621 struct sock *rtnl = net->rtnl;
622 int err = 0;
623
624 NETLINK_CB(skb).dst_group = group;
625 if (echo)
626 atomic_inc(&skb->users);
627 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
628 if (echo)
629 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
630 return err;
631 }
632
633 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
634 {
635 struct sock *rtnl = net->rtnl;
636
637 return nlmsg_unicast(rtnl, skb, pid);
638 }
639 EXPORT_SYMBOL(rtnl_unicast);
640
641 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
642 struct nlmsghdr *nlh, gfp_t flags)
643 {
644 struct sock *rtnl = net->rtnl;
645 int report = 0;
646
647 if (nlh)
648 report = nlmsg_report(nlh);
649
650 nlmsg_notify(rtnl, skb, pid, group, report, flags);
651 }
652 EXPORT_SYMBOL(rtnl_notify);
653
654 void rtnl_set_sk_err(struct net *net, u32 group, int error)
655 {
656 struct sock *rtnl = net->rtnl;
657
658 netlink_set_err(rtnl, 0, group, error);
659 }
660 EXPORT_SYMBOL(rtnl_set_sk_err);
661
662 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
663 {
664 struct nlattr *mx;
665 int i, valid = 0;
666
667 mx = nla_nest_start(skb, RTA_METRICS);
668 if (mx == NULL)
669 return -ENOBUFS;
670
671 for (i = 0; i < RTAX_MAX; i++) {
672 if (metrics[i]) {
673 if (i == RTAX_CC_ALGO - 1) {
674 char tmp[TCP_CA_NAME_MAX], *name;
675
676 name = tcp_ca_get_name_by_key(metrics[i], tmp);
677 if (!name)
678 continue;
679 if (nla_put_string(skb, i + 1, name))
680 goto nla_put_failure;
681 } else {
682 if (nla_put_u32(skb, i + 1, metrics[i]))
683 goto nla_put_failure;
684 }
685 valid++;
686 }
687 }
688
689 if (!valid) {
690 nla_nest_cancel(skb, mx);
691 return 0;
692 }
693
694 return nla_nest_end(skb, mx);
695
696 nla_put_failure:
697 nla_nest_cancel(skb, mx);
698 return -EMSGSIZE;
699 }
700 EXPORT_SYMBOL(rtnetlink_put_metrics);
701
702 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
703 long expires, u32 error)
704 {
705 struct rta_cacheinfo ci = {
706 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
707 .rta_used = dst->__use,
708 .rta_clntref = atomic_read(&(dst->__refcnt)),
709 .rta_error = error,
710 .rta_id = id,
711 };
712
713 if (expires) {
714 unsigned long clock;
715
716 clock = jiffies_to_clock_t(abs(expires));
717 clock = min_t(unsigned long, clock, INT_MAX);
718 ci.rta_expires = (expires > 0) ? clock : -clock;
719 }
720 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
721 }
722 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
723
724 static void set_operstate(struct net_device *dev, unsigned char transition)
725 {
726 unsigned char operstate = dev->operstate;
727
728 switch (transition) {
729 case IF_OPER_UP:
730 if ((operstate == IF_OPER_DORMANT ||
731 operstate == IF_OPER_UNKNOWN) &&
732 !netif_dormant(dev))
733 operstate = IF_OPER_UP;
734 break;
735
736 case IF_OPER_DORMANT:
737 if (operstate == IF_OPER_UP ||
738 operstate == IF_OPER_UNKNOWN)
739 operstate = IF_OPER_DORMANT;
740 break;
741 }
742
743 if (dev->operstate != operstate) {
744 write_lock_bh(&dev_base_lock);
745 dev->operstate = operstate;
746 write_unlock_bh(&dev_base_lock);
747 netdev_state_change(dev);
748 }
749 }
750
751 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
752 {
753 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
754 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
755 }
756
757 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
758 const struct ifinfomsg *ifm)
759 {
760 unsigned int flags = ifm->ifi_flags;
761
762 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
763 if (ifm->ifi_change)
764 flags = (flags & ifm->ifi_change) |
765 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
766
767 return flags;
768 }
769
770 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
771 const struct rtnl_link_stats64 *b)
772 {
773 a->rx_packets = b->rx_packets;
774 a->tx_packets = b->tx_packets;
775 a->rx_bytes = b->rx_bytes;
776 a->tx_bytes = b->tx_bytes;
777 a->rx_errors = b->rx_errors;
778 a->tx_errors = b->tx_errors;
779 a->rx_dropped = b->rx_dropped;
780 a->tx_dropped = b->tx_dropped;
781
782 a->multicast = b->multicast;
783 a->collisions = b->collisions;
784
785 a->rx_length_errors = b->rx_length_errors;
786 a->rx_over_errors = b->rx_over_errors;
787 a->rx_crc_errors = b->rx_crc_errors;
788 a->rx_frame_errors = b->rx_frame_errors;
789 a->rx_fifo_errors = b->rx_fifo_errors;
790 a->rx_missed_errors = b->rx_missed_errors;
791
792 a->tx_aborted_errors = b->tx_aborted_errors;
793 a->tx_carrier_errors = b->tx_carrier_errors;
794 a->tx_fifo_errors = b->tx_fifo_errors;
795 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
796 a->tx_window_errors = b->tx_window_errors;
797
798 a->rx_compressed = b->rx_compressed;
799 a->tx_compressed = b->tx_compressed;
800 }
801
802 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
803 {
804 memcpy(v, b, sizeof(*b));
805 }
806
807 /* All VF info */
808 static inline int rtnl_vfinfo_size(const struct net_device *dev,
809 u32 ext_filter_mask)
810 {
811 if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
812 (ext_filter_mask & RTEXT_FILTER_VF)) {
813 int num_vfs = dev_num_vf(dev->dev.parent);
814 size_t size = nla_total_size(sizeof(struct nlattr));
815 size += nla_total_size(num_vfs * sizeof(struct nlattr));
816 size += num_vfs *
817 (nla_total_size(sizeof(struct ifla_vf_mac)) +
818 nla_total_size(sizeof(struct ifla_vf_vlan)) +
819 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
820 nla_total_size(sizeof(struct ifla_vf_rate)) +
821 nla_total_size(sizeof(struct ifla_vf_link_state)) +
822 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
823 /* IFLA_VF_STATS_RX_PACKETS */
824 nla_total_size(sizeof(__u64)) +
825 /* IFLA_VF_STATS_TX_PACKETS */
826 nla_total_size(sizeof(__u64)) +
827 /* IFLA_VF_STATS_RX_BYTES */
828 nla_total_size(sizeof(__u64)) +
829 /* IFLA_VF_STATS_TX_BYTES */
830 nla_total_size(sizeof(__u64)) +
831 /* IFLA_VF_STATS_BROADCAST */
832 nla_total_size(sizeof(__u64)) +
833 /* IFLA_VF_STATS_MULTICAST */
834 nla_total_size(sizeof(__u64)));
835 return size;
836 } else
837 return 0;
838 }
839
840 static size_t rtnl_port_size(const struct net_device *dev,
841 u32 ext_filter_mask)
842 {
843 size_t port_size = nla_total_size(4) /* PORT_VF */
844 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
845 + nla_total_size(sizeof(struct ifla_port_vsi))
846 /* PORT_VSI_TYPE */
847 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
848 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
849 + nla_total_size(1) /* PROT_VDP_REQUEST */
850 + nla_total_size(2); /* PORT_VDP_RESPONSE */
851 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
852 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
853 + port_size;
854 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
855 + port_size;
856
857 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
858 !(ext_filter_mask & RTEXT_FILTER_VF))
859 return 0;
860 if (dev_num_vf(dev->dev.parent))
861 return port_self_size + vf_ports_size +
862 vf_port_size * dev_num_vf(dev->dev.parent);
863 else
864 return port_self_size;
865 }
866
867 static noinline size_t if_nlmsg_size(const struct net_device *dev,
868 u32 ext_filter_mask)
869 {
870 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
871 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
872 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
873 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
874 + nla_total_size(sizeof(struct rtnl_link_ifmap))
875 + nla_total_size(sizeof(struct rtnl_link_stats))
876 + nla_total_size(sizeof(struct rtnl_link_stats64))
877 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
878 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
879 + nla_total_size(4) /* IFLA_TXQLEN */
880 + nla_total_size(4) /* IFLA_WEIGHT */
881 + nla_total_size(4) /* IFLA_MTU */
882 + nla_total_size(4) /* IFLA_LINK */
883 + nla_total_size(4) /* IFLA_MASTER */
884 + nla_total_size(1) /* IFLA_CARRIER */
885 + nla_total_size(4) /* IFLA_PROMISCUITY */
886 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
887 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
888 + nla_total_size(1) /* IFLA_OPERSTATE */
889 + nla_total_size(1) /* IFLA_LINKMODE */
890 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
891 + nla_total_size(4) /* IFLA_LINK_NETNSID */
892 + nla_total_size(ext_filter_mask
893 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
894 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
895 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
896 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
897 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
898 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
899 + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_SWITCH_ID */
900 }
901
902 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
903 {
904 struct nlattr *vf_ports;
905 struct nlattr *vf_port;
906 int vf;
907 int err;
908
909 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
910 if (!vf_ports)
911 return -EMSGSIZE;
912
913 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
914 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
915 if (!vf_port)
916 goto nla_put_failure;
917 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
918 goto nla_put_failure;
919 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
920 if (err == -EMSGSIZE)
921 goto nla_put_failure;
922 if (err) {
923 nla_nest_cancel(skb, vf_port);
924 continue;
925 }
926 nla_nest_end(skb, vf_port);
927 }
928
929 nla_nest_end(skb, vf_ports);
930
931 return 0;
932
933 nla_put_failure:
934 nla_nest_cancel(skb, vf_ports);
935 return -EMSGSIZE;
936 }
937
938 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
939 {
940 struct nlattr *port_self;
941 int err;
942
943 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
944 if (!port_self)
945 return -EMSGSIZE;
946
947 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
948 if (err) {
949 nla_nest_cancel(skb, port_self);
950 return (err == -EMSGSIZE) ? err : 0;
951 }
952
953 nla_nest_end(skb, port_self);
954
955 return 0;
956 }
957
958 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
959 u32 ext_filter_mask)
960 {
961 int err;
962
963 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
964 !(ext_filter_mask & RTEXT_FILTER_VF))
965 return 0;
966
967 err = rtnl_port_self_fill(skb, dev);
968 if (err)
969 return err;
970
971 if (dev_num_vf(dev->dev.parent)) {
972 err = rtnl_vf_ports_fill(skb, dev);
973 if (err)
974 return err;
975 }
976
977 return 0;
978 }
979
980 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
981 {
982 int err;
983 struct netdev_phys_item_id ppid;
984
985 err = dev_get_phys_port_id(dev, &ppid);
986 if (err) {
987 if (err == -EOPNOTSUPP)
988 return 0;
989 return err;
990 }
991
992 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
993 return -EMSGSIZE;
994
995 return 0;
996 }
997
998 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
999 {
1000 char name[IFNAMSIZ];
1001 int err;
1002
1003 err = dev_get_phys_port_name(dev, name, sizeof(name));
1004 if (err) {
1005 if (err == -EOPNOTSUPP)
1006 return 0;
1007 return err;
1008 }
1009
1010 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
1011 return -EMSGSIZE;
1012
1013 return 0;
1014 }
1015
1016 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1017 {
1018 int err;
1019 struct switchdev_attr attr = {
1020 .id = SWITCHDEV_ATTR_PORT_PARENT_ID,
1021 .flags = SWITCHDEV_F_NO_RECURSE,
1022 };
1023
1024 err = switchdev_port_attr_get(dev, &attr);
1025 if (err) {
1026 if (err == -EOPNOTSUPP)
1027 return 0;
1028 return err;
1029 }
1030
1031 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1032 attr.u.ppid.id))
1033 return -EMSGSIZE;
1034
1035 return 0;
1036 }
1037
1038 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1039 int type, u32 pid, u32 seq, u32 change,
1040 unsigned int flags, u32 ext_filter_mask)
1041 {
1042 struct ifinfomsg *ifm;
1043 struct nlmsghdr *nlh;
1044 struct rtnl_link_stats64 temp;
1045 const struct rtnl_link_stats64 *stats;
1046 struct nlattr *attr, *af_spec;
1047 struct rtnl_af_ops *af_ops;
1048 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1049
1050 ASSERT_RTNL();
1051 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1052 if (nlh == NULL)
1053 return -EMSGSIZE;
1054
1055 ifm = nlmsg_data(nlh);
1056 ifm->ifi_family = AF_UNSPEC;
1057 ifm->__ifi_pad = 0;
1058 ifm->ifi_type = dev->type;
1059 ifm->ifi_index = dev->ifindex;
1060 ifm->ifi_flags = dev_get_flags(dev);
1061 ifm->ifi_change = change;
1062
1063 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1064 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1065 nla_put_u8(skb, IFLA_OPERSTATE,
1066 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1067 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1068 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1069 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1070 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1071 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1072 #ifdef CONFIG_RPS
1073 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1074 #endif
1075 (dev->ifindex != dev_get_iflink(dev) &&
1076 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1077 (upper_dev &&
1078 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1079 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1080 (dev->qdisc &&
1081 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1082 (dev->ifalias &&
1083 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1084 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1085 atomic_read(&dev->carrier_changes)))
1086 goto nla_put_failure;
1087
1088 if (1) {
1089 struct rtnl_link_ifmap map = {
1090 .mem_start = dev->mem_start,
1091 .mem_end = dev->mem_end,
1092 .base_addr = dev->base_addr,
1093 .irq = dev->irq,
1094 .dma = dev->dma,
1095 .port = dev->if_port,
1096 };
1097 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1098 goto nla_put_failure;
1099 }
1100
1101 if (dev->addr_len) {
1102 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1103 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1104 goto nla_put_failure;
1105 }
1106
1107 if (rtnl_phys_port_id_fill(skb, dev))
1108 goto nla_put_failure;
1109
1110 if (rtnl_phys_port_name_fill(skb, dev))
1111 goto nla_put_failure;
1112
1113 if (rtnl_phys_switch_id_fill(skb, dev))
1114 goto nla_put_failure;
1115
1116 attr = nla_reserve(skb, IFLA_STATS,
1117 sizeof(struct rtnl_link_stats));
1118 if (attr == NULL)
1119 goto nla_put_failure;
1120
1121 stats = dev_get_stats(dev, &temp);
1122 copy_rtnl_link_stats(nla_data(attr), stats);
1123
1124 attr = nla_reserve(skb, IFLA_STATS64,
1125 sizeof(struct rtnl_link_stats64));
1126 if (attr == NULL)
1127 goto nla_put_failure;
1128 copy_rtnl_link_stats64(nla_data(attr), stats);
1129
1130 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1131 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1132 goto nla_put_failure;
1133
1134 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1135 && (ext_filter_mask & RTEXT_FILTER_VF)) {
1136 int i;
1137
1138 struct nlattr *vfinfo, *vf, *vfstats;
1139 int num_vfs = dev_num_vf(dev->dev.parent);
1140
1141 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1142 if (!vfinfo)
1143 goto nla_put_failure;
1144 for (i = 0; i < num_vfs; i++) {
1145 struct ifla_vf_info ivi;
1146 struct ifla_vf_mac vf_mac;
1147 struct ifla_vf_vlan vf_vlan;
1148 struct ifla_vf_rate vf_rate;
1149 struct ifla_vf_tx_rate vf_tx_rate;
1150 struct ifla_vf_spoofchk vf_spoofchk;
1151 struct ifla_vf_link_state vf_linkstate;
1152 struct ifla_vf_rss_query_en vf_rss_query_en;
1153 struct ifla_vf_stats vf_stats;
1154
1155 /*
1156 * Not all SR-IOV capable drivers support the
1157 * spoofcheck and "RSS query enable" query. Preset to
1158 * -1 so the user space tool can detect that the driver
1159 * didn't report anything.
1160 */
1161 ivi.spoofchk = -1;
1162 ivi.rss_query_en = -1;
1163 memset(ivi.mac, 0, sizeof(ivi.mac));
1164 /* The default value for VF link state is "auto"
1165 * IFLA_VF_LINK_STATE_AUTO which equals zero
1166 */
1167 ivi.linkstate = 0;
1168 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1169 break;
1170 vf_mac.vf =
1171 vf_vlan.vf =
1172 vf_rate.vf =
1173 vf_tx_rate.vf =
1174 vf_spoofchk.vf =
1175 vf_linkstate.vf =
1176 vf_rss_query_en.vf = ivi.vf;
1177
1178 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1179 vf_vlan.vlan = ivi.vlan;
1180 vf_vlan.qos = ivi.qos;
1181 vf_tx_rate.rate = ivi.max_tx_rate;
1182 vf_rate.min_tx_rate = ivi.min_tx_rate;
1183 vf_rate.max_tx_rate = ivi.max_tx_rate;
1184 vf_spoofchk.setting = ivi.spoofchk;
1185 vf_linkstate.link_state = ivi.linkstate;
1186 vf_rss_query_en.setting = ivi.rss_query_en;
1187 vf = nla_nest_start(skb, IFLA_VF_INFO);
1188 if (!vf) {
1189 nla_nest_cancel(skb, vfinfo);
1190 goto nla_put_failure;
1191 }
1192 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1193 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1194 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1195 &vf_rate) ||
1196 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1197 &vf_tx_rate) ||
1198 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1199 &vf_spoofchk) ||
1200 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1201 &vf_linkstate) ||
1202 nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1203 sizeof(vf_rss_query_en),
1204 &vf_rss_query_en))
1205 goto nla_put_failure;
1206 memset(&vf_stats, 0, sizeof(vf_stats));
1207 if (dev->netdev_ops->ndo_get_vf_stats)
1208 dev->netdev_ops->ndo_get_vf_stats(dev, i,
1209 &vf_stats);
1210 vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1211 if (!vfstats) {
1212 nla_nest_cancel(skb, vf);
1213 nla_nest_cancel(skb, vfinfo);
1214 goto nla_put_failure;
1215 }
1216 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS,
1217 vf_stats.rx_packets) ||
1218 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS,
1219 vf_stats.tx_packets) ||
1220 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES,
1221 vf_stats.rx_bytes) ||
1222 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES,
1223 vf_stats.tx_bytes) ||
1224 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST,
1225 vf_stats.broadcast) ||
1226 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST,
1227 vf_stats.multicast))
1228 goto nla_put_failure;
1229 nla_nest_end(skb, vfstats);
1230 nla_nest_end(skb, vf);
1231 }
1232 nla_nest_end(skb, vfinfo);
1233 }
1234
1235 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1236 goto nla_put_failure;
1237
1238 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1239 if (rtnl_link_fill(skb, dev) < 0)
1240 goto nla_put_failure;
1241 }
1242
1243 if (dev->rtnl_link_ops &&
1244 dev->rtnl_link_ops->get_link_net) {
1245 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1246
1247 if (!net_eq(dev_net(dev), link_net)) {
1248 int id = peernet2id_alloc(dev_net(dev), link_net);
1249
1250 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1251 goto nla_put_failure;
1252 }
1253 }
1254
1255 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1256 goto nla_put_failure;
1257
1258 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1259 if (af_ops->fill_link_af) {
1260 struct nlattr *af;
1261 int err;
1262
1263 if (!(af = nla_nest_start(skb, af_ops->family)))
1264 goto nla_put_failure;
1265
1266 err = af_ops->fill_link_af(skb, dev);
1267
1268 /*
1269 * Caller may return ENODATA to indicate that there
1270 * was no data to be dumped. This is not an error, it
1271 * means we should trim the attribute header and
1272 * continue.
1273 */
1274 if (err == -ENODATA)
1275 nla_nest_cancel(skb, af);
1276 else if (err < 0)
1277 goto nla_put_failure;
1278
1279 nla_nest_end(skb, af);
1280 }
1281 }
1282
1283 nla_nest_end(skb, af_spec);
1284
1285 nlmsg_end(skb, nlh);
1286 return 0;
1287
1288 nla_put_failure:
1289 nlmsg_cancel(skb, nlh);
1290 return -EMSGSIZE;
1291 }
1292
1293 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1294 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1295 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1296 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1297 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1298 [IFLA_MTU] = { .type = NLA_U32 },
1299 [IFLA_LINK] = { .type = NLA_U32 },
1300 [IFLA_MASTER] = { .type = NLA_U32 },
1301 [IFLA_CARRIER] = { .type = NLA_U8 },
1302 [IFLA_TXQLEN] = { .type = NLA_U32 },
1303 [IFLA_WEIGHT] = { .type = NLA_U32 },
1304 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1305 [IFLA_LINKMODE] = { .type = NLA_U8 },
1306 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1307 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1308 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1309 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1310 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1311 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1312 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1313 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1314 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1315 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1316 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1317 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1318 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1319 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1320 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1321 [IFLA_LINK_NETNSID] = { .type = NLA_S32 },
1322 };
1323
1324 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1325 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1326 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1327 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1328 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1329 };
1330
1331 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1332 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1333 };
1334
1335 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1336 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
1337 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
1338 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
1339 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
1340 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) },
1341 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) },
1342 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) },
1343 [IFLA_VF_STATS] = { .type = NLA_NESTED },
1344 };
1345
1346 static const struct nla_policy ifla_vf_stats_policy[IFLA_VF_STATS_MAX + 1] = {
1347 [IFLA_VF_STATS_RX_PACKETS] = { .type = NLA_U64 },
1348 [IFLA_VF_STATS_TX_PACKETS] = { .type = NLA_U64 },
1349 [IFLA_VF_STATS_RX_BYTES] = { .type = NLA_U64 },
1350 [IFLA_VF_STATS_TX_BYTES] = { .type = NLA_U64 },
1351 [IFLA_VF_STATS_BROADCAST] = { .type = NLA_U64 },
1352 [IFLA_VF_STATS_MULTICAST] = { .type = NLA_U64 },
1353 };
1354
1355 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1356 [IFLA_PORT_VF] = { .type = NLA_U32 },
1357 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1358 .len = PORT_PROFILE_MAX },
1359 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1360 .len = sizeof(struct ifla_port_vsi)},
1361 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1362 .len = PORT_UUID_MAX },
1363 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1364 .len = PORT_UUID_MAX },
1365 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1366 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1367 };
1368
1369 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1370 {
1371 struct net *net = sock_net(skb->sk);
1372 int h, s_h;
1373 int idx = 0, s_idx;
1374 struct net_device *dev;
1375 struct hlist_head *head;
1376 struct nlattr *tb[IFLA_MAX+1];
1377 u32 ext_filter_mask = 0;
1378 int err;
1379 int hdrlen;
1380
1381 s_h = cb->args[0];
1382 s_idx = cb->args[1];
1383
1384 cb->seq = net->dev_base_seq;
1385
1386 /* A hack to preserve kernel<->userspace interface.
1387 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1388 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1389 * what iproute2 < v3.9.0 used.
1390 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1391 * attribute, its netlink message is shorter than struct ifinfomsg.
1392 */
1393 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1394 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1395
1396 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1397
1398 if (tb[IFLA_EXT_MASK])
1399 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1400 }
1401
1402 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1403 idx = 0;
1404 head = &net->dev_index_head[h];
1405 hlist_for_each_entry(dev, head, index_hlist) {
1406 if (idx < s_idx)
1407 goto cont;
1408 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1409 NETLINK_CB(cb->skb).portid,
1410 cb->nlh->nlmsg_seq, 0,
1411 NLM_F_MULTI,
1412 ext_filter_mask);
1413 /* If we ran out of room on the first message,
1414 * we're in trouble
1415 */
1416 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1417
1418 if (err < 0)
1419 goto out;
1420
1421 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1422 cont:
1423 idx++;
1424 }
1425 }
1426 out:
1427 cb->args[1] = idx;
1428 cb->args[0] = h;
1429
1430 return skb->len;
1431 }
1432
1433 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1434 {
1435 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1436 }
1437 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1438
1439 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1440 {
1441 struct net *net;
1442 /* Examine the link attributes and figure out which
1443 * network namespace we are talking about.
1444 */
1445 if (tb[IFLA_NET_NS_PID])
1446 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1447 else if (tb[IFLA_NET_NS_FD])
1448 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1449 else
1450 net = get_net(src_net);
1451 return net;
1452 }
1453 EXPORT_SYMBOL(rtnl_link_get_net);
1454
1455 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1456 {
1457 if (dev) {
1458 if (tb[IFLA_ADDRESS] &&
1459 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1460 return -EINVAL;
1461
1462 if (tb[IFLA_BROADCAST] &&
1463 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1464 return -EINVAL;
1465 }
1466
1467 if (tb[IFLA_AF_SPEC]) {
1468 struct nlattr *af;
1469 int rem, err;
1470
1471 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1472 const struct rtnl_af_ops *af_ops;
1473
1474 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1475 return -EAFNOSUPPORT;
1476
1477 if (!af_ops->set_link_af)
1478 return -EOPNOTSUPP;
1479
1480 if (af_ops->validate_link_af) {
1481 err = af_ops->validate_link_af(dev, af);
1482 if (err < 0)
1483 return err;
1484 }
1485 }
1486 }
1487
1488 return 0;
1489 }
1490
1491 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1492 {
1493 int rem, err = -EINVAL;
1494 struct nlattr *vf;
1495 const struct net_device_ops *ops = dev->netdev_ops;
1496
1497 nla_for_each_nested(vf, attr, rem) {
1498 switch (nla_type(vf)) {
1499 case IFLA_VF_MAC: {
1500 struct ifla_vf_mac *ivm;
1501 ivm = nla_data(vf);
1502 err = -EOPNOTSUPP;
1503 if (ops->ndo_set_vf_mac)
1504 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1505 ivm->mac);
1506 break;
1507 }
1508 case IFLA_VF_VLAN: {
1509 struct ifla_vf_vlan *ivv;
1510 ivv = nla_data(vf);
1511 err = -EOPNOTSUPP;
1512 if (ops->ndo_set_vf_vlan)
1513 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1514 ivv->vlan,
1515 ivv->qos);
1516 break;
1517 }
1518 case IFLA_VF_TX_RATE: {
1519 struct ifla_vf_tx_rate *ivt;
1520 struct ifla_vf_info ivf;
1521 ivt = nla_data(vf);
1522 err = -EOPNOTSUPP;
1523 if (ops->ndo_get_vf_config)
1524 err = ops->ndo_get_vf_config(dev, ivt->vf,
1525 &ivf);
1526 if (err)
1527 break;
1528 err = -EOPNOTSUPP;
1529 if (ops->ndo_set_vf_rate)
1530 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1531 ivf.min_tx_rate,
1532 ivt->rate);
1533 break;
1534 }
1535 case IFLA_VF_RATE: {
1536 struct ifla_vf_rate *ivt;
1537 ivt = nla_data(vf);
1538 err = -EOPNOTSUPP;
1539 if (ops->ndo_set_vf_rate)
1540 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1541 ivt->min_tx_rate,
1542 ivt->max_tx_rate);
1543 break;
1544 }
1545 case IFLA_VF_SPOOFCHK: {
1546 struct ifla_vf_spoofchk *ivs;
1547 ivs = nla_data(vf);
1548 err = -EOPNOTSUPP;
1549 if (ops->ndo_set_vf_spoofchk)
1550 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1551 ivs->setting);
1552 break;
1553 }
1554 case IFLA_VF_LINK_STATE: {
1555 struct ifla_vf_link_state *ivl;
1556 ivl = nla_data(vf);
1557 err = -EOPNOTSUPP;
1558 if (ops->ndo_set_vf_link_state)
1559 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1560 ivl->link_state);
1561 break;
1562 }
1563 case IFLA_VF_RSS_QUERY_EN: {
1564 struct ifla_vf_rss_query_en *ivrssq_en;
1565
1566 ivrssq_en = nla_data(vf);
1567 err = -EOPNOTSUPP;
1568 if (ops->ndo_set_vf_rss_query_en)
1569 err = ops->ndo_set_vf_rss_query_en(dev,
1570 ivrssq_en->vf,
1571 ivrssq_en->setting);
1572 break;
1573 }
1574 default:
1575 err = -EINVAL;
1576 break;
1577 }
1578 if (err)
1579 break;
1580 }
1581 return err;
1582 }
1583
1584 static int do_set_master(struct net_device *dev, int ifindex)
1585 {
1586 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1587 const struct net_device_ops *ops;
1588 int err;
1589
1590 if (upper_dev) {
1591 if (upper_dev->ifindex == ifindex)
1592 return 0;
1593 ops = upper_dev->netdev_ops;
1594 if (ops->ndo_del_slave) {
1595 err = ops->ndo_del_slave(upper_dev, dev);
1596 if (err)
1597 return err;
1598 } else {
1599 return -EOPNOTSUPP;
1600 }
1601 }
1602
1603 if (ifindex) {
1604 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1605 if (!upper_dev)
1606 return -EINVAL;
1607 ops = upper_dev->netdev_ops;
1608 if (ops->ndo_add_slave) {
1609 err = ops->ndo_add_slave(upper_dev, dev);
1610 if (err)
1611 return err;
1612 } else {
1613 return -EOPNOTSUPP;
1614 }
1615 }
1616 return 0;
1617 }
1618
1619 #define DO_SETLINK_MODIFIED 0x01
1620 /* notify flag means notify + modified. */
1621 #define DO_SETLINK_NOTIFY 0x03
1622 static int do_setlink(const struct sk_buff *skb,
1623 struct net_device *dev, struct ifinfomsg *ifm,
1624 struct nlattr **tb, char *ifname, int status)
1625 {
1626 const struct net_device_ops *ops = dev->netdev_ops;
1627 int err;
1628
1629 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1630 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1631 if (IS_ERR(net)) {
1632 err = PTR_ERR(net);
1633 goto errout;
1634 }
1635 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1636 put_net(net);
1637 err = -EPERM;
1638 goto errout;
1639 }
1640 err = dev_change_net_namespace(dev, net, ifname);
1641 put_net(net);
1642 if (err)
1643 goto errout;
1644 status |= DO_SETLINK_MODIFIED;
1645 }
1646
1647 if (tb[IFLA_MAP]) {
1648 struct rtnl_link_ifmap *u_map;
1649 struct ifmap k_map;
1650
1651 if (!ops->ndo_set_config) {
1652 err = -EOPNOTSUPP;
1653 goto errout;
1654 }
1655
1656 if (!netif_device_present(dev)) {
1657 err = -ENODEV;
1658 goto errout;
1659 }
1660
1661 u_map = nla_data(tb[IFLA_MAP]);
1662 k_map.mem_start = (unsigned long) u_map->mem_start;
1663 k_map.mem_end = (unsigned long) u_map->mem_end;
1664 k_map.base_addr = (unsigned short) u_map->base_addr;
1665 k_map.irq = (unsigned char) u_map->irq;
1666 k_map.dma = (unsigned char) u_map->dma;
1667 k_map.port = (unsigned char) u_map->port;
1668
1669 err = ops->ndo_set_config(dev, &k_map);
1670 if (err < 0)
1671 goto errout;
1672
1673 status |= DO_SETLINK_NOTIFY;
1674 }
1675
1676 if (tb[IFLA_ADDRESS]) {
1677 struct sockaddr *sa;
1678 int len;
1679
1680 len = sizeof(sa_family_t) + dev->addr_len;
1681 sa = kmalloc(len, GFP_KERNEL);
1682 if (!sa) {
1683 err = -ENOMEM;
1684 goto errout;
1685 }
1686 sa->sa_family = dev->type;
1687 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1688 dev->addr_len);
1689 err = dev_set_mac_address(dev, sa);
1690 kfree(sa);
1691 if (err)
1692 goto errout;
1693 status |= DO_SETLINK_MODIFIED;
1694 }
1695
1696 if (tb[IFLA_MTU]) {
1697 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1698 if (err < 0)
1699 goto errout;
1700 status |= DO_SETLINK_MODIFIED;
1701 }
1702
1703 if (tb[IFLA_GROUP]) {
1704 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1705 status |= DO_SETLINK_NOTIFY;
1706 }
1707
1708 /*
1709 * Interface selected by interface index but interface
1710 * name provided implies that a name change has been
1711 * requested.
1712 */
1713 if (ifm->ifi_index > 0 && ifname[0]) {
1714 err = dev_change_name(dev, ifname);
1715 if (err < 0)
1716 goto errout;
1717 status |= DO_SETLINK_MODIFIED;
1718 }
1719
1720 if (tb[IFLA_IFALIAS]) {
1721 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1722 nla_len(tb[IFLA_IFALIAS]));
1723 if (err < 0)
1724 goto errout;
1725 status |= DO_SETLINK_NOTIFY;
1726 }
1727
1728 if (tb[IFLA_BROADCAST]) {
1729 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1730 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1731 }
1732
1733 if (ifm->ifi_flags || ifm->ifi_change) {
1734 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1735 if (err < 0)
1736 goto errout;
1737 }
1738
1739 if (tb[IFLA_MASTER]) {
1740 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1741 if (err)
1742 goto errout;
1743 status |= DO_SETLINK_MODIFIED;
1744 }
1745
1746 if (tb[IFLA_CARRIER]) {
1747 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1748 if (err)
1749 goto errout;
1750 status |= DO_SETLINK_MODIFIED;
1751 }
1752
1753 if (tb[IFLA_TXQLEN]) {
1754 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1755
1756 if (dev->tx_queue_len ^ value)
1757 status |= DO_SETLINK_NOTIFY;
1758
1759 dev->tx_queue_len = value;
1760 }
1761
1762 if (tb[IFLA_OPERSTATE])
1763 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1764
1765 if (tb[IFLA_LINKMODE]) {
1766 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1767
1768 write_lock_bh(&dev_base_lock);
1769 if (dev->link_mode ^ value)
1770 status |= DO_SETLINK_NOTIFY;
1771 dev->link_mode = value;
1772 write_unlock_bh(&dev_base_lock);
1773 }
1774
1775 if (tb[IFLA_VFINFO_LIST]) {
1776 struct nlattr *attr;
1777 int rem;
1778 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1779 if (nla_type(attr) != IFLA_VF_INFO) {
1780 err = -EINVAL;
1781 goto errout;
1782 }
1783 err = do_setvfinfo(dev, attr);
1784 if (err < 0)
1785 goto errout;
1786 status |= DO_SETLINK_NOTIFY;
1787 }
1788 }
1789 err = 0;
1790
1791 if (tb[IFLA_VF_PORTS]) {
1792 struct nlattr *port[IFLA_PORT_MAX+1];
1793 struct nlattr *attr;
1794 int vf;
1795 int rem;
1796
1797 err = -EOPNOTSUPP;
1798 if (!ops->ndo_set_vf_port)
1799 goto errout;
1800
1801 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1802 if (nla_type(attr) != IFLA_VF_PORT)
1803 continue;
1804 err = nla_parse_nested(port, IFLA_PORT_MAX,
1805 attr, ifla_port_policy);
1806 if (err < 0)
1807 goto errout;
1808 if (!port[IFLA_PORT_VF]) {
1809 err = -EOPNOTSUPP;
1810 goto errout;
1811 }
1812 vf = nla_get_u32(port[IFLA_PORT_VF]);
1813 err = ops->ndo_set_vf_port(dev, vf, port);
1814 if (err < 0)
1815 goto errout;
1816 status |= DO_SETLINK_NOTIFY;
1817 }
1818 }
1819 err = 0;
1820
1821 if (tb[IFLA_PORT_SELF]) {
1822 struct nlattr *port[IFLA_PORT_MAX+1];
1823
1824 err = nla_parse_nested(port, IFLA_PORT_MAX,
1825 tb[IFLA_PORT_SELF], ifla_port_policy);
1826 if (err < 0)
1827 goto errout;
1828
1829 err = -EOPNOTSUPP;
1830 if (ops->ndo_set_vf_port)
1831 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1832 if (err < 0)
1833 goto errout;
1834 status |= DO_SETLINK_NOTIFY;
1835 }
1836
1837 if (tb[IFLA_AF_SPEC]) {
1838 struct nlattr *af;
1839 int rem;
1840
1841 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1842 const struct rtnl_af_ops *af_ops;
1843
1844 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1845 BUG();
1846
1847 err = af_ops->set_link_af(dev, af);
1848 if (err < 0)
1849 goto errout;
1850
1851 status |= DO_SETLINK_NOTIFY;
1852 }
1853 }
1854 err = 0;
1855
1856 errout:
1857 if (status & DO_SETLINK_MODIFIED) {
1858 if (status & DO_SETLINK_NOTIFY)
1859 netdev_state_change(dev);
1860
1861 if (err < 0)
1862 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",
1863 dev->name);
1864 }
1865
1866 return err;
1867 }
1868
1869 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1870 {
1871 struct net *net = sock_net(skb->sk);
1872 struct ifinfomsg *ifm;
1873 struct net_device *dev;
1874 int err;
1875 struct nlattr *tb[IFLA_MAX+1];
1876 char ifname[IFNAMSIZ];
1877
1878 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1879 if (err < 0)
1880 goto errout;
1881
1882 if (tb[IFLA_IFNAME])
1883 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1884 else
1885 ifname[0] = '\0';
1886
1887 err = -EINVAL;
1888 ifm = nlmsg_data(nlh);
1889 if (ifm->ifi_index > 0)
1890 dev = __dev_get_by_index(net, ifm->ifi_index);
1891 else if (tb[IFLA_IFNAME])
1892 dev = __dev_get_by_name(net, ifname);
1893 else
1894 goto errout;
1895
1896 if (dev == NULL) {
1897 err = -ENODEV;
1898 goto errout;
1899 }
1900
1901 err = validate_linkmsg(dev, tb);
1902 if (err < 0)
1903 goto errout;
1904
1905 err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1906 errout:
1907 return err;
1908 }
1909
1910 static int rtnl_group_dellink(const struct net *net, int group)
1911 {
1912 struct net_device *dev, *aux;
1913 LIST_HEAD(list_kill);
1914 bool found = false;
1915
1916 if (!group)
1917 return -EPERM;
1918
1919 for_each_netdev(net, dev) {
1920 if (dev->group == group) {
1921 const struct rtnl_link_ops *ops;
1922
1923 found = true;
1924 ops = dev->rtnl_link_ops;
1925 if (!ops || !ops->dellink)
1926 return -EOPNOTSUPP;
1927 }
1928 }
1929
1930 if (!found)
1931 return -ENODEV;
1932
1933 for_each_netdev_safe(net, dev, aux) {
1934 if (dev->group == group) {
1935 const struct rtnl_link_ops *ops;
1936
1937 ops = dev->rtnl_link_ops;
1938 ops->dellink(dev, &list_kill);
1939 }
1940 }
1941 unregister_netdevice_many(&list_kill);
1942
1943 return 0;
1944 }
1945
1946 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1947 {
1948 struct net *net = sock_net(skb->sk);
1949 const struct rtnl_link_ops *ops;
1950 struct net_device *dev;
1951 struct ifinfomsg *ifm;
1952 char ifname[IFNAMSIZ];
1953 struct nlattr *tb[IFLA_MAX+1];
1954 int err;
1955 LIST_HEAD(list_kill);
1956
1957 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1958 if (err < 0)
1959 return err;
1960
1961 if (tb[IFLA_IFNAME])
1962 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1963
1964 ifm = nlmsg_data(nlh);
1965 if (ifm->ifi_index > 0)
1966 dev = __dev_get_by_index(net, ifm->ifi_index);
1967 else if (tb[IFLA_IFNAME])
1968 dev = __dev_get_by_name(net, ifname);
1969 else if (tb[IFLA_GROUP])
1970 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
1971 else
1972 return -EINVAL;
1973
1974 if (!dev)
1975 return -ENODEV;
1976
1977 ops = dev->rtnl_link_ops;
1978 if (!ops || !ops->dellink)
1979 return -EOPNOTSUPP;
1980
1981 ops->dellink(dev, &list_kill);
1982 unregister_netdevice_many(&list_kill);
1983 return 0;
1984 }
1985
1986 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1987 {
1988 unsigned int old_flags;
1989 int err;
1990
1991 old_flags = dev->flags;
1992 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1993 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1994 if (err < 0)
1995 return err;
1996 }
1997
1998 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1999
2000 __dev_notify_flags(dev, old_flags, ~0U);
2001 return 0;
2002 }
2003 EXPORT_SYMBOL(rtnl_configure_link);
2004
2005 struct net_device *rtnl_create_link(struct net *net,
2006 const char *ifname, unsigned char name_assign_type,
2007 const struct rtnl_link_ops *ops, struct nlattr *tb[])
2008 {
2009 int err;
2010 struct net_device *dev;
2011 unsigned int num_tx_queues = 1;
2012 unsigned int num_rx_queues = 1;
2013
2014 if (tb[IFLA_NUM_TX_QUEUES])
2015 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2016 else if (ops->get_num_tx_queues)
2017 num_tx_queues = ops->get_num_tx_queues();
2018
2019 if (tb[IFLA_NUM_RX_QUEUES])
2020 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2021 else if (ops->get_num_rx_queues)
2022 num_rx_queues = ops->get_num_rx_queues();
2023
2024 err = -ENOMEM;
2025 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2026 ops->setup, num_tx_queues, num_rx_queues);
2027 if (!dev)
2028 goto err;
2029
2030 dev_net_set(dev, net);
2031 dev->rtnl_link_ops = ops;
2032 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2033
2034 if (tb[IFLA_MTU])
2035 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2036 if (tb[IFLA_ADDRESS]) {
2037 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2038 nla_len(tb[IFLA_ADDRESS]));
2039 dev->addr_assign_type = NET_ADDR_SET;
2040 }
2041 if (tb[IFLA_BROADCAST])
2042 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2043 nla_len(tb[IFLA_BROADCAST]));
2044 if (tb[IFLA_TXQLEN])
2045 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2046 if (tb[IFLA_OPERSTATE])
2047 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2048 if (tb[IFLA_LINKMODE])
2049 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2050 if (tb[IFLA_GROUP])
2051 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2052
2053 return dev;
2054
2055 err:
2056 return ERR_PTR(err);
2057 }
2058 EXPORT_SYMBOL(rtnl_create_link);
2059
2060 static int rtnl_group_changelink(const struct sk_buff *skb,
2061 struct net *net, int group,
2062 struct ifinfomsg *ifm,
2063 struct nlattr **tb)
2064 {
2065 struct net_device *dev, *aux;
2066 int err;
2067
2068 for_each_netdev_safe(net, dev, aux) {
2069 if (dev->group == group) {
2070 err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2071 if (err < 0)
2072 return err;
2073 }
2074 }
2075
2076 return 0;
2077 }
2078
2079 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2080 {
2081 struct net *net = sock_net(skb->sk);
2082 const struct rtnl_link_ops *ops;
2083 const struct rtnl_link_ops *m_ops = NULL;
2084 struct net_device *dev;
2085 struct net_device *master_dev = NULL;
2086 struct ifinfomsg *ifm;
2087 char kind[MODULE_NAME_LEN];
2088 char ifname[IFNAMSIZ];
2089 struct nlattr *tb[IFLA_MAX+1];
2090 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2091 unsigned char name_assign_type = NET_NAME_USER;
2092 int err;
2093
2094 #ifdef CONFIG_MODULES
2095 replay:
2096 #endif
2097 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2098 if (err < 0)
2099 return err;
2100
2101 if (tb[IFLA_IFNAME])
2102 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2103 else
2104 ifname[0] = '\0';
2105
2106 ifm = nlmsg_data(nlh);
2107 if (ifm->ifi_index > 0)
2108 dev = __dev_get_by_index(net, ifm->ifi_index);
2109 else {
2110 if (ifname[0])
2111 dev = __dev_get_by_name(net, ifname);
2112 else
2113 dev = NULL;
2114 }
2115
2116 if (dev) {
2117 master_dev = netdev_master_upper_dev_get(dev);
2118 if (master_dev)
2119 m_ops = master_dev->rtnl_link_ops;
2120 }
2121
2122 err = validate_linkmsg(dev, tb);
2123 if (err < 0)
2124 return err;
2125
2126 if (tb[IFLA_LINKINFO]) {
2127 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2128 tb[IFLA_LINKINFO], ifla_info_policy);
2129 if (err < 0)
2130 return err;
2131 } else
2132 memset(linkinfo, 0, sizeof(linkinfo));
2133
2134 if (linkinfo[IFLA_INFO_KIND]) {
2135 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2136 ops = rtnl_link_ops_get(kind);
2137 } else {
2138 kind[0] = '\0';
2139 ops = NULL;
2140 }
2141
2142 if (1) {
2143 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2144 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2145 struct nlattr **data = NULL;
2146 struct nlattr **slave_data = NULL;
2147 struct net *dest_net, *link_net = NULL;
2148
2149 if (ops) {
2150 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2151 err = nla_parse_nested(attr, ops->maxtype,
2152 linkinfo[IFLA_INFO_DATA],
2153 ops->policy);
2154 if (err < 0)
2155 return err;
2156 data = attr;
2157 }
2158 if (ops->validate) {
2159 err = ops->validate(tb, data);
2160 if (err < 0)
2161 return err;
2162 }
2163 }
2164
2165 if (m_ops) {
2166 if (m_ops->slave_maxtype &&
2167 linkinfo[IFLA_INFO_SLAVE_DATA]) {
2168 err = nla_parse_nested(slave_attr,
2169 m_ops->slave_maxtype,
2170 linkinfo[IFLA_INFO_SLAVE_DATA],
2171 m_ops->slave_policy);
2172 if (err < 0)
2173 return err;
2174 slave_data = slave_attr;
2175 }
2176 if (m_ops->slave_validate) {
2177 err = m_ops->slave_validate(tb, slave_data);
2178 if (err < 0)
2179 return err;
2180 }
2181 }
2182
2183 if (dev) {
2184 int status = 0;
2185
2186 if (nlh->nlmsg_flags & NLM_F_EXCL)
2187 return -EEXIST;
2188 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2189 return -EOPNOTSUPP;
2190
2191 if (linkinfo[IFLA_INFO_DATA]) {
2192 if (!ops || ops != dev->rtnl_link_ops ||
2193 !ops->changelink)
2194 return -EOPNOTSUPP;
2195
2196 err = ops->changelink(dev, tb, data);
2197 if (err < 0)
2198 return err;
2199 status |= DO_SETLINK_NOTIFY;
2200 }
2201
2202 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2203 if (!m_ops || !m_ops->slave_changelink)
2204 return -EOPNOTSUPP;
2205
2206 err = m_ops->slave_changelink(master_dev, dev,
2207 tb, slave_data);
2208 if (err < 0)
2209 return err;
2210 status |= DO_SETLINK_NOTIFY;
2211 }
2212
2213 return do_setlink(skb, dev, ifm, tb, ifname, status);
2214 }
2215
2216 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2217 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2218 return rtnl_group_changelink(skb, net,
2219 nla_get_u32(tb[IFLA_GROUP]),
2220 ifm, tb);
2221 return -ENODEV;
2222 }
2223
2224 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2225 return -EOPNOTSUPP;
2226
2227 if (!ops) {
2228 #ifdef CONFIG_MODULES
2229 if (kind[0]) {
2230 __rtnl_unlock();
2231 request_module("rtnl-link-%s", kind);
2232 rtnl_lock();
2233 ops = rtnl_link_ops_get(kind);
2234 if (ops)
2235 goto replay;
2236 }
2237 #endif
2238 return -EOPNOTSUPP;
2239 }
2240
2241 if (!ops->setup)
2242 return -EOPNOTSUPP;
2243
2244 if (!ifname[0]) {
2245 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2246 name_assign_type = NET_NAME_ENUM;
2247 }
2248
2249 dest_net = rtnl_link_get_net(net, tb);
2250 if (IS_ERR(dest_net))
2251 return PTR_ERR(dest_net);
2252
2253 err = -EPERM;
2254 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2255 goto out;
2256
2257 if (tb[IFLA_LINK_NETNSID]) {
2258 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2259
2260 link_net = get_net_ns_by_id(dest_net, id);
2261 if (!link_net) {
2262 err = -EINVAL;
2263 goto out;
2264 }
2265 err = -EPERM;
2266 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2267 goto out;
2268 }
2269
2270 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2271 name_assign_type, ops, tb);
2272 if (IS_ERR(dev)) {
2273 err = PTR_ERR(dev);
2274 goto out;
2275 }
2276
2277 dev->ifindex = ifm->ifi_index;
2278
2279 if (ops->newlink) {
2280 err = ops->newlink(link_net ? : net, dev, tb, data);
2281 /* Drivers should call free_netdev() in ->destructor
2282 * and unregister it on failure after registration
2283 * so that device could be finally freed in rtnl_unlock.
2284 */
2285 if (err < 0) {
2286 /* If device is not registered at all, free it now */
2287 if (dev->reg_state == NETREG_UNINITIALIZED)
2288 free_netdev(dev);
2289 goto out;
2290 }
2291 } else {
2292 err = register_netdevice(dev);
2293 if (err < 0) {
2294 free_netdev(dev);
2295 goto out;
2296 }
2297 }
2298 err = rtnl_configure_link(dev, ifm);
2299 if (err < 0)
2300 goto out_unregister;
2301 if (link_net) {
2302 err = dev_change_net_namespace(dev, dest_net, ifname);
2303 if (err < 0)
2304 goto out_unregister;
2305 }
2306 out:
2307 if (link_net)
2308 put_net(link_net);
2309 put_net(dest_net);
2310 return err;
2311 out_unregister:
2312 if (ops->newlink) {
2313 LIST_HEAD(list_kill);
2314
2315 ops->dellink(dev, &list_kill);
2316 unregister_netdevice_many(&list_kill);
2317 } else {
2318 unregister_netdevice(dev);
2319 }
2320 goto out;
2321 }
2322 }
2323
2324 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2325 {
2326 struct net *net = sock_net(skb->sk);
2327 struct ifinfomsg *ifm;
2328 char ifname[IFNAMSIZ];
2329 struct nlattr *tb[IFLA_MAX+1];
2330 struct net_device *dev = NULL;
2331 struct sk_buff *nskb;
2332 int err;
2333 u32 ext_filter_mask = 0;
2334
2335 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2336 if (err < 0)
2337 return err;
2338
2339 if (tb[IFLA_IFNAME])
2340 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2341
2342 if (tb[IFLA_EXT_MASK])
2343 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2344
2345 ifm = nlmsg_data(nlh);
2346 if (ifm->ifi_index > 0)
2347 dev = __dev_get_by_index(net, ifm->ifi_index);
2348 else if (tb[IFLA_IFNAME])
2349 dev = __dev_get_by_name(net, ifname);
2350 else
2351 return -EINVAL;
2352
2353 if (dev == NULL)
2354 return -ENODEV;
2355
2356 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2357 if (nskb == NULL)
2358 return -ENOBUFS;
2359
2360 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2361 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2362 if (err < 0) {
2363 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2364 WARN_ON(err == -EMSGSIZE);
2365 kfree_skb(nskb);
2366 } else
2367 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2368
2369 return err;
2370 }
2371
2372 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2373 {
2374 struct net *net = sock_net(skb->sk);
2375 struct net_device *dev;
2376 struct nlattr *tb[IFLA_MAX+1];
2377 u32 ext_filter_mask = 0;
2378 u16 min_ifinfo_dump_size = 0;
2379 int hdrlen;
2380
2381 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2382 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2383 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2384
2385 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2386 if (tb[IFLA_EXT_MASK])
2387 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2388 }
2389
2390 if (!ext_filter_mask)
2391 return NLMSG_GOODSIZE;
2392 /*
2393 * traverse the list of net devices and compute the minimum
2394 * buffer size based upon the filter mask.
2395 */
2396 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2397 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2398 if_nlmsg_size(dev,
2399 ext_filter_mask));
2400 }
2401
2402 return min_ifinfo_dump_size;
2403 }
2404
2405 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2406 {
2407 int idx;
2408 int s_idx = cb->family;
2409
2410 if (s_idx == 0)
2411 s_idx = 1;
2412 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2413 int type = cb->nlh->nlmsg_type-RTM_BASE;
2414 if (idx < s_idx || idx == PF_PACKET)
2415 continue;
2416 if (rtnl_msg_handlers[idx] == NULL ||
2417 rtnl_msg_handlers[idx][type].dumpit == NULL)
2418 continue;
2419 if (idx > s_idx) {
2420 memset(&cb->args[0], 0, sizeof(cb->args));
2421 cb->prev_seq = 0;
2422 cb->seq = 0;
2423 }
2424 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2425 break;
2426 }
2427 cb->family = idx;
2428
2429 return skb->len;
2430 }
2431
2432 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2433 unsigned int change, gfp_t flags)
2434 {
2435 struct net *net = dev_net(dev);
2436 struct sk_buff *skb;
2437 int err = -ENOBUFS;
2438 size_t if_info_size;
2439
2440 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2441 if (skb == NULL)
2442 goto errout;
2443
2444 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2445 if (err < 0) {
2446 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2447 WARN_ON(err == -EMSGSIZE);
2448 kfree_skb(skb);
2449 goto errout;
2450 }
2451 return skb;
2452 errout:
2453 if (err < 0)
2454 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2455 return NULL;
2456 }
2457
2458 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2459 {
2460 struct net *net = dev_net(dev);
2461
2462 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2463 }
2464
2465 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2466 gfp_t flags)
2467 {
2468 struct sk_buff *skb;
2469
2470 if (dev->reg_state != NETREG_REGISTERED)
2471 return;
2472
2473 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2474 if (skb)
2475 rtmsg_ifinfo_send(skb, dev, flags);
2476 }
2477 EXPORT_SYMBOL(rtmsg_ifinfo);
2478
2479 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2480 struct net_device *dev,
2481 u8 *addr, u16 vid, u32 pid, u32 seq,
2482 int type, unsigned int flags,
2483 int nlflags)
2484 {
2485 struct nlmsghdr *nlh;
2486 struct ndmsg *ndm;
2487
2488 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2489 if (!nlh)
2490 return -EMSGSIZE;
2491
2492 ndm = nlmsg_data(nlh);
2493 ndm->ndm_family = AF_BRIDGE;
2494 ndm->ndm_pad1 = 0;
2495 ndm->ndm_pad2 = 0;
2496 ndm->ndm_flags = flags;
2497 ndm->ndm_type = 0;
2498 ndm->ndm_ifindex = dev->ifindex;
2499 ndm->ndm_state = NUD_PERMANENT;
2500
2501 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2502 goto nla_put_failure;
2503 if (vid)
2504 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2505 goto nla_put_failure;
2506
2507 nlmsg_end(skb, nlh);
2508 return 0;
2509
2510 nla_put_failure:
2511 nlmsg_cancel(skb, nlh);
2512 return -EMSGSIZE;
2513 }
2514
2515 static inline size_t rtnl_fdb_nlmsg_size(void)
2516 {
2517 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2518 }
2519
2520 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type)
2521 {
2522 struct net *net = dev_net(dev);
2523 struct sk_buff *skb;
2524 int err = -ENOBUFS;
2525
2526 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2527 if (!skb)
2528 goto errout;
2529
2530 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2531 0, 0, type, NTF_SELF, 0);
2532 if (err < 0) {
2533 kfree_skb(skb);
2534 goto errout;
2535 }
2536
2537 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2538 return;
2539 errout:
2540 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2541 }
2542
2543 /**
2544 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2545 */
2546 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2547 struct nlattr *tb[],
2548 struct net_device *dev,
2549 const unsigned char *addr, u16 vid,
2550 u16 flags)
2551 {
2552 int err = -EINVAL;
2553
2554 /* If aging addresses are supported device will need to
2555 * implement its own handler for this.
2556 */
2557 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2558 pr_info("%s: FDB only supports static addresses\n", dev->name);
2559 return err;
2560 }
2561
2562 if (vid) {
2563 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2564 return err;
2565 }
2566
2567 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2568 err = dev_uc_add_excl(dev, addr);
2569 else if (is_multicast_ether_addr(addr))
2570 err = dev_mc_add_excl(dev, addr);
2571
2572 /* Only return duplicate errors if NLM_F_EXCL is set */
2573 if (err == -EEXIST && !(flags & NLM_F_EXCL))
2574 err = 0;
2575
2576 return err;
2577 }
2578 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2579
2580 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2581 {
2582 u16 vid = 0;
2583
2584 if (vlan_attr) {
2585 if (nla_len(vlan_attr) != sizeof(u16)) {
2586 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2587 return -EINVAL;
2588 }
2589
2590 vid = nla_get_u16(vlan_attr);
2591
2592 if (!vid || vid >= VLAN_VID_MASK) {
2593 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2594 vid);
2595 return -EINVAL;
2596 }
2597 }
2598 *p_vid = vid;
2599 return 0;
2600 }
2601
2602 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2603 {
2604 struct net *net = sock_net(skb->sk);
2605 struct ndmsg *ndm;
2606 struct nlattr *tb[NDA_MAX+1];
2607 struct net_device *dev;
2608 u8 *addr;
2609 u16 vid;
2610 int err;
2611
2612 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2613 if (err < 0)
2614 return err;
2615
2616 ndm = nlmsg_data(nlh);
2617 if (ndm->ndm_ifindex == 0) {
2618 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2619 return -EINVAL;
2620 }
2621
2622 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2623 if (dev == NULL) {
2624 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2625 return -ENODEV;
2626 }
2627
2628 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2629 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2630 return -EINVAL;
2631 }
2632
2633 addr = nla_data(tb[NDA_LLADDR]);
2634
2635 err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2636 if (err)
2637 return err;
2638
2639 err = -EOPNOTSUPP;
2640
2641 /* Support fdb on master device the net/bridge default case */
2642 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2643 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2644 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2645 const struct net_device_ops *ops = br_dev->netdev_ops;
2646
2647 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2648 nlh->nlmsg_flags);
2649 if (err)
2650 goto out;
2651 else
2652 ndm->ndm_flags &= ~NTF_MASTER;
2653 }
2654
2655 /* Embedded bridge, macvlan, and any other device support */
2656 if ((ndm->ndm_flags & NTF_SELF)) {
2657 if (dev->netdev_ops->ndo_fdb_add)
2658 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2659 vid,
2660 nlh->nlmsg_flags);
2661 else
2662 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2663 nlh->nlmsg_flags);
2664
2665 if (!err) {
2666 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH);
2667 ndm->ndm_flags &= ~NTF_SELF;
2668 }
2669 }
2670 out:
2671 return err;
2672 }
2673
2674 /**
2675 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2676 */
2677 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2678 struct nlattr *tb[],
2679 struct net_device *dev,
2680 const unsigned char *addr, u16 vid)
2681 {
2682 int err = -EINVAL;
2683
2684 /* If aging addresses are supported device will need to
2685 * implement its own handler for this.
2686 */
2687 if (!(ndm->ndm_state & NUD_PERMANENT)) {
2688 pr_info("%s: FDB only supports static addresses\n", dev->name);
2689 return err;
2690 }
2691
2692 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2693 err = dev_uc_del(dev, addr);
2694 else if (is_multicast_ether_addr(addr))
2695 err = dev_mc_del(dev, addr);
2696
2697 return err;
2698 }
2699 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2700
2701 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2702 {
2703 struct net *net = sock_net(skb->sk);
2704 struct ndmsg *ndm;
2705 struct nlattr *tb[NDA_MAX+1];
2706 struct net_device *dev;
2707 int err = -EINVAL;
2708 __u8 *addr;
2709 u16 vid;
2710
2711 if (!netlink_capable(skb, CAP_NET_ADMIN))
2712 return -EPERM;
2713
2714 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2715 if (err < 0)
2716 return err;
2717
2718 ndm = nlmsg_data(nlh);
2719 if (ndm->ndm_ifindex == 0) {
2720 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2721 return -EINVAL;
2722 }
2723
2724 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2725 if (dev == NULL) {
2726 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2727 return -ENODEV;
2728 }
2729
2730 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2731 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2732 return -EINVAL;
2733 }
2734
2735 addr = nla_data(tb[NDA_LLADDR]);
2736
2737 err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2738 if (err)
2739 return err;
2740
2741 err = -EOPNOTSUPP;
2742
2743 /* Support fdb on master device the net/bridge default case */
2744 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2745 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2746 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2747 const struct net_device_ops *ops = br_dev->netdev_ops;
2748
2749 if (ops->ndo_fdb_del)
2750 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
2751
2752 if (err)
2753 goto out;
2754 else
2755 ndm->ndm_flags &= ~NTF_MASTER;
2756 }
2757
2758 /* Embedded bridge, macvlan, and any other device support */
2759 if (ndm->ndm_flags & NTF_SELF) {
2760 if (dev->netdev_ops->ndo_fdb_del)
2761 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
2762 vid);
2763 else
2764 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
2765
2766 if (!err) {
2767 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH);
2768 ndm->ndm_flags &= ~NTF_SELF;
2769 }
2770 }
2771 out:
2772 return err;
2773 }
2774
2775 static int nlmsg_populate_fdb(struct sk_buff *skb,
2776 struct netlink_callback *cb,
2777 struct net_device *dev,
2778 int *idx,
2779 struct netdev_hw_addr_list *list)
2780 {
2781 struct netdev_hw_addr *ha;
2782 int err;
2783 u32 portid, seq;
2784
2785 portid = NETLINK_CB(cb->skb).portid;
2786 seq = cb->nlh->nlmsg_seq;
2787
2788 list_for_each_entry(ha, &list->list, list) {
2789 if (*idx < cb->args[0])
2790 goto skip;
2791
2792 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
2793 portid, seq,
2794 RTM_NEWNEIGH, NTF_SELF,
2795 NLM_F_MULTI);
2796 if (err < 0)
2797 return err;
2798 skip:
2799 *idx += 1;
2800 }
2801 return 0;
2802 }
2803
2804 /**
2805 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2806 * @nlh: netlink message header
2807 * @dev: netdevice
2808 *
2809 * Default netdevice operation to dump the existing unicast address list.
2810 * Returns number of addresses from list put in skb.
2811 */
2812 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2813 struct netlink_callback *cb,
2814 struct net_device *dev,
2815 struct net_device *filter_dev,
2816 int idx)
2817 {
2818 int err;
2819
2820 netif_addr_lock_bh(dev);
2821 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2822 if (err)
2823 goto out;
2824 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2825 out:
2826 netif_addr_unlock_bh(dev);
2827 return idx;
2828 }
2829 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2830
2831 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2832 {
2833 struct net_device *dev;
2834 struct nlattr *tb[IFLA_MAX+1];
2835 struct net_device *br_dev = NULL;
2836 const struct net_device_ops *ops = NULL;
2837 const struct net_device_ops *cops = NULL;
2838 struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2839 struct net *net = sock_net(skb->sk);
2840 int brport_idx = 0;
2841 int br_idx = 0;
2842 int idx = 0;
2843
2844 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2845 ifla_policy) == 0) {
2846 if (tb[IFLA_MASTER])
2847 br_idx = nla_get_u32(tb[IFLA_MASTER]);
2848 }
2849
2850 brport_idx = ifm->ifi_index;
2851
2852 if (br_idx) {
2853 br_dev = __dev_get_by_index(net, br_idx);
2854 if (!br_dev)
2855 return -ENODEV;
2856
2857 ops = br_dev->netdev_ops;
2858 }
2859
2860 for_each_netdev(net, dev) {
2861 if (brport_idx && (dev->ifindex != brport_idx))
2862 continue;
2863
2864 if (!br_idx) { /* user did not specify a specific bridge */
2865 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2866 br_dev = netdev_master_upper_dev_get(dev);
2867 cops = br_dev->netdev_ops;
2868 }
2869
2870 } else {
2871 if (dev != br_dev &&
2872 !(dev->priv_flags & IFF_BRIDGE_PORT))
2873 continue;
2874
2875 if (br_dev != netdev_master_upper_dev_get(dev) &&
2876 !(dev->priv_flags & IFF_EBRIDGE))
2877 continue;
2878
2879 cops = ops;
2880 }
2881
2882 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2883 if (cops && cops->ndo_fdb_dump)
2884 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2885 idx);
2886 }
2887
2888 if (dev->netdev_ops->ndo_fdb_dump)
2889 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
2890 idx);
2891 else
2892 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2893
2894 cops = NULL;
2895 }
2896
2897 cb->args[0] = idx;
2898 return skb->len;
2899 }
2900
2901 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
2902 unsigned int attrnum, unsigned int flag)
2903 {
2904 if (mask & flag)
2905 return nla_put_u8(skb, attrnum, !!(flags & flag));
2906 return 0;
2907 }
2908
2909 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2910 struct net_device *dev, u16 mode,
2911 u32 flags, u32 mask, int nlflags,
2912 u32 filter_mask,
2913 int (*vlan_fill)(struct sk_buff *skb,
2914 struct net_device *dev,
2915 u32 filter_mask))
2916 {
2917 struct nlmsghdr *nlh;
2918 struct ifinfomsg *ifm;
2919 struct nlattr *br_afspec;
2920 struct nlattr *protinfo;
2921 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2922 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2923 int err = 0;
2924
2925 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
2926 if (nlh == NULL)
2927 return -EMSGSIZE;
2928
2929 ifm = nlmsg_data(nlh);
2930 ifm->ifi_family = AF_BRIDGE;
2931 ifm->__ifi_pad = 0;
2932 ifm->ifi_type = dev->type;
2933 ifm->ifi_index = dev->ifindex;
2934 ifm->ifi_flags = dev_get_flags(dev);
2935 ifm->ifi_change = 0;
2936
2937
2938 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2939 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2940 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2941 (br_dev &&
2942 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2943 (dev->addr_len &&
2944 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2945 (dev->ifindex != dev_get_iflink(dev) &&
2946 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
2947 goto nla_put_failure;
2948
2949 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2950 if (!br_afspec)
2951 goto nla_put_failure;
2952
2953 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
2954 nla_nest_cancel(skb, br_afspec);
2955 goto nla_put_failure;
2956 }
2957
2958 if (mode != BRIDGE_MODE_UNDEF) {
2959 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2960 nla_nest_cancel(skb, br_afspec);
2961 goto nla_put_failure;
2962 }
2963 }
2964 if (vlan_fill) {
2965 err = vlan_fill(skb, dev, filter_mask);
2966 if (err) {
2967 nla_nest_cancel(skb, br_afspec);
2968 goto nla_put_failure;
2969 }
2970 }
2971 nla_nest_end(skb, br_afspec);
2972
2973 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
2974 if (!protinfo)
2975 goto nla_put_failure;
2976
2977 if (brport_nla_put_flag(skb, flags, mask,
2978 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
2979 brport_nla_put_flag(skb, flags, mask,
2980 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
2981 brport_nla_put_flag(skb, flags, mask,
2982 IFLA_BRPORT_FAST_LEAVE,
2983 BR_MULTICAST_FAST_LEAVE) ||
2984 brport_nla_put_flag(skb, flags, mask,
2985 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
2986 brport_nla_put_flag(skb, flags, mask,
2987 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
2988 brport_nla_put_flag(skb, flags, mask,
2989 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
2990 brport_nla_put_flag(skb, flags, mask,
2991 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
2992 brport_nla_put_flag(skb, flags, mask,
2993 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
2994 nla_nest_cancel(skb, protinfo);
2995 goto nla_put_failure;
2996 }
2997
2998 nla_nest_end(skb, protinfo);
2999
3000 nlmsg_end(skb, nlh);
3001 return 0;
3002 nla_put_failure:
3003 nlmsg_cancel(skb, nlh);
3004 return err ? err : -EMSGSIZE;
3005 }
3006 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3007
3008 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3009 {
3010 struct net *net = sock_net(skb->sk);
3011 struct net_device *dev;
3012 int idx = 0;
3013 u32 portid = NETLINK_CB(cb->skb).portid;
3014 u32 seq = cb->nlh->nlmsg_seq;
3015 u32 filter_mask = 0;
3016
3017 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3018 struct nlattr *extfilt;
3019
3020 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3021 IFLA_EXT_MASK);
3022 if (extfilt) {
3023 if (nla_len(extfilt) < sizeof(filter_mask))
3024 return -EINVAL;
3025
3026 filter_mask = nla_get_u32(extfilt);
3027 }
3028 }
3029
3030 rcu_read_lock();
3031 for_each_netdev_rcu(net, dev) {
3032 const struct net_device_ops *ops = dev->netdev_ops;
3033 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3034
3035 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3036 if (idx >= cb->args[0] &&
3037 br_dev->netdev_ops->ndo_bridge_getlink(
3038 skb, portid, seq, dev, filter_mask,
3039 NLM_F_MULTI) < 0)
3040 break;
3041 idx++;
3042 }
3043
3044 if (ops->ndo_bridge_getlink) {
3045 if (idx >= cb->args[0] &&
3046 ops->ndo_bridge_getlink(skb, portid, seq, dev,
3047 filter_mask,
3048 NLM_F_MULTI) < 0)
3049 break;
3050 idx++;
3051 }
3052 }
3053 rcu_read_unlock();
3054 cb->args[0] = idx;
3055
3056 return skb->len;
3057 }
3058
3059 static inline size_t bridge_nlmsg_size(void)
3060 {
3061 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3062 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3063 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3064 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
3065 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
3066 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
3067 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
3068 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
3069 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3070 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
3071 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
3072 }
3073
3074 static int rtnl_bridge_notify(struct net_device *dev)
3075 {
3076 struct net *net = dev_net(dev);
3077 struct sk_buff *skb;
3078 int err = -EOPNOTSUPP;
3079
3080 if (!dev->netdev_ops->ndo_bridge_getlink)
3081 return 0;
3082
3083 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3084 if (!skb) {
3085 err = -ENOMEM;
3086 goto errout;
3087 }
3088
3089 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3090 if (err < 0)
3091 goto errout;
3092
3093 if (!skb->len)
3094 goto errout;
3095
3096 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3097 return 0;
3098 errout:
3099 WARN_ON(err == -EMSGSIZE);
3100 kfree_skb(skb);
3101 if (err)
3102 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3103 return err;
3104 }
3105
3106 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3107 {
3108 struct net *net = sock_net(skb->sk);
3109 struct ifinfomsg *ifm;
3110 struct net_device *dev;
3111 struct nlattr *br_spec, *attr = NULL;
3112 int rem, err = -EOPNOTSUPP;
3113 u16 flags = 0;
3114 bool have_flags = false;
3115
3116 if (nlmsg_len(nlh) < sizeof(*ifm))
3117 return -EINVAL;
3118
3119 ifm = nlmsg_data(nlh);
3120 if (ifm->ifi_family != AF_BRIDGE)
3121 return -EPFNOSUPPORT;
3122
3123 dev = __dev_get_by_index(net, ifm->ifi_index);
3124 if (!dev) {
3125 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3126 return -ENODEV;
3127 }
3128
3129 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3130 if (br_spec) {
3131 nla_for_each_nested(attr, br_spec, rem) {
3132 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3133 if (nla_len(attr) < sizeof(flags))
3134 return -EINVAL;
3135
3136 have_flags = true;
3137 flags = nla_get_u16(attr);
3138 break;
3139 }
3140 }
3141 }
3142
3143 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3144 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3145
3146 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3147 err = -EOPNOTSUPP;
3148 goto out;
3149 }
3150
3151 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3152 if (err)
3153 goto out;
3154
3155 flags &= ~BRIDGE_FLAGS_MASTER;
3156 }
3157
3158 if ((flags & BRIDGE_FLAGS_SELF)) {
3159 if (!dev->netdev_ops->ndo_bridge_setlink)
3160 err = -EOPNOTSUPP;
3161 else
3162 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3163 flags);
3164 if (!err) {
3165 flags &= ~BRIDGE_FLAGS_SELF;
3166
3167 /* Generate event to notify upper layer of bridge
3168 * change
3169 */
3170 err = rtnl_bridge_notify(dev);
3171 }
3172 }
3173
3174 if (have_flags)
3175 memcpy(nla_data(attr), &flags, sizeof(flags));
3176 out:
3177 return err;
3178 }
3179
3180 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3181 {
3182 struct net *net = sock_net(skb->sk);
3183 struct ifinfomsg *ifm;
3184 struct net_device *dev;
3185 struct nlattr *br_spec, *attr = NULL;
3186 int rem, err = -EOPNOTSUPP;
3187 u16 flags = 0;
3188 bool have_flags = false;
3189
3190 if (nlmsg_len(nlh) < sizeof(*ifm))
3191 return -EINVAL;
3192
3193 ifm = nlmsg_data(nlh);
3194 if (ifm->ifi_family != AF_BRIDGE)
3195 return -EPFNOSUPPORT;
3196
3197 dev = __dev_get_by_index(net, ifm->ifi_index);
3198 if (!dev) {
3199 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3200 return -ENODEV;
3201 }
3202
3203 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3204 if (br_spec) {
3205 nla_for_each_nested(attr, br_spec, rem) {
3206 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3207 if (nla_len(attr) < sizeof(flags))
3208 return -EINVAL;
3209
3210 have_flags = true;
3211 flags = nla_get_u16(attr);
3212 break;
3213 }
3214 }
3215 }
3216
3217 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3218 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3219
3220 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3221 err = -EOPNOTSUPP;
3222 goto out;
3223 }
3224
3225 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3226 if (err)
3227 goto out;
3228
3229 flags &= ~BRIDGE_FLAGS_MASTER;
3230 }
3231
3232 if ((flags & BRIDGE_FLAGS_SELF)) {
3233 if (!dev->netdev_ops->ndo_bridge_dellink)
3234 err = -EOPNOTSUPP;
3235 else
3236 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3237 flags);
3238
3239 if (!err) {
3240 flags &= ~BRIDGE_FLAGS_SELF;
3241
3242 /* Generate event to notify upper layer of bridge
3243 * change
3244 */
3245 err = rtnl_bridge_notify(dev);
3246 }
3247 }
3248
3249 if (have_flags)
3250 memcpy(nla_data(attr), &flags, sizeof(flags));
3251 out:
3252 return err;
3253 }
3254
3255 /* Process one rtnetlink message. */
3256
3257 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3258 {
3259 struct net *net = sock_net(skb->sk);
3260 rtnl_doit_func doit;
3261 int sz_idx, kind;
3262 int family;
3263 int type;
3264 int err;
3265
3266 type = nlh->nlmsg_type;
3267 if (type > RTM_MAX)
3268 return -EOPNOTSUPP;
3269
3270 type -= RTM_BASE;
3271
3272 /* All the messages must have at least 1 byte length */
3273 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3274 return 0;
3275
3276 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3277 sz_idx = type>>2;
3278 kind = type&3;
3279
3280 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3281 return -EPERM;
3282
3283 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3284 struct sock *rtnl;
3285 rtnl_dumpit_func dumpit;
3286 rtnl_calcit_func calcit;
3287 u16 min_dump_alloc = 0;
3288
3289 dumpit = rtnl_get_dumpit(family, type);
3290 if (dumpit == NULL)
3291 return -EOPNOTSUPP;
3292 calcit = rtnl_get_calcit(family, type);
3293 if (calcit)
3294 min_dump_alloc = calcit(skb, nlh);
3295
3296 __rtnl_unlock();
3297 rtnl = net->rtnl;
3298 {
3299 struct netlink_dump_control c = {
3300 .dump = dumpit,
3301 .min_dump_alloc = min_dump_alloc,
3302 };
3303 err = netlink_dump_start(rtnl, skb, nlh, &c);
3304 }
3305 rtnl_lock();
3306 return err;
3307 }
3308
3309 doit = rtnl_get_doit(family, type);
3310 if (doit == NULL)
3311 return -EOPNOTSUPP;
3312
3313 return doit(skb, nlh);
3314 }
3315
3316 static void rtnetlink_rcv(struct sk_buff *skb)
3317 {
3318 rtnl_lock();
3319 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3320 rtnl_unlock();
3321 }
3322
3323 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3324 {
3325 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3326
3327 switch (event) {
3328 case NETDEV_UP:
3329 case NETDEV_DOWN:
3330 case NETDEV_PRE_UP:
3331 case NETDEV_POST_INIT:
3332 case NETDEV_REGISTER:
3333 case NETDEV_CHANGE:
3334 case NETDEV_PRE_TYPE_CHANGE:
3335 case NETDEV_GOING_DOWN:
3336 case NETDEV_UNREGISTER:
3337 case NETDEV_UNREGISTER_FINAL:
3338 case NETDEV_RELEASE:
3339 case NETDEV_JOIN:
3340 case NETDEV_BONDING_INFO:
3341 break;
3342 default:
3343 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3344 break;
3345 }
3346 return NOTIFY_DONE;
3347 }
3348
3349 static struct notifier_block rtnetlink_dev_notifier = {
3350 .notifier_call = rtnetlink_event,
3351 };
3352
3353
3354 static int __net_init rtnetlink_net_init(struct net *net)
3355 {
3356 struct sock *sk;
3357 struct netlink_kernel_cfg cfg = {
3358 .groups = RTNLGRP_MAX,
3359 .input = rtnetlink_rcv,
3360 .cb_mutex = &rtnl_mutex,
3361 .flags = NL_CFG_F_NONROOT_RECV,
3362 };
3363
3364 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3365 if (!sk)
3366 return -ENOMEM;
3367 net->rtnl = sk;
3368 return 0;
3369 }
3370
3371 static void __net_exit rtnetlink_net_exit(struct net *net)
3372 {
3373 netlink_kernel_release(net->rtnl);
3374 net->rtnl = NULL;
3375 }
3376
3377 static struct pernet_operations rtnetlink_net_ops = {
3378 .init = rtnetlink_net_init,
3379 .exit = rtnetlink_net_exit,
3380 };
3381
3382 void __init rtnetlink_init(void)
3383 {
3384 if (register_pernet_subsys(&rtnetlink_net_ops))
3385 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3386
3387 register_netdevice_notifier(&rtnetlink_dev_notifier);
3388
3389 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3390 rtnl_dump_ifinfo, rtnl_calcit);
3391 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3392 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3393 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3394
3395 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3396 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3397
3398 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3399 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3400 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3401
3402 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3403 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3404 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3405 }
3406
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