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03d61b54aac03c98c9597c106b44b3ea34a0062c
[deliverable/linux.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/if_bridge.h>
39 #include <linux/if_vlan.h>
40 #include <linux/pci.h>
41 #include <linux/etherdevice.h>
42
43 #include <asm/uaccess.h>
44
45 #include <linux/inet.h>
46 #include <linux/netdevice.h>
47 #include <net/switchdev.h>
48 #include <net/ip.h>
49 #include <net/protocol.h>
50 #include <net/arp.h>
51 #include <net/route.h>
52 #include <net/udp.h>
53 #include <net/tcp.h>
54 #include <net/sock.h>
55 #include <net/pkt_sched.h>
56 #include <net/fib_rules.h>
57 #include <net/rtnetlink.h>
58 #include <net/net_namespace.h>
59
60 struct rtnl_link {
61 rtnl_doit_func doit;
62 rtnl_dumpit_func dumpit;
63 rtnl_calcit_func calcit;
64 };
65
66 static DEFINE_MUTEX(rtnl_mutex);
67
68 void rtnl_lock(void)
69 {
70 mutex_lock(&rtnl_mutex);
71 }
72 EXPORT_SYMBOL(rtnl_lock);
73
74 void __rtnl_unlock(void)
75 {
76 mutex_unlock(&rtnl_mutex);
77 }
78
79 void rtnl_unlock(void)
80 {
81 /* This fellow will unlock it for us. */
82 netdev_run_todo();
83 }
84 EXPORT_SYMBOL(rtnl_unlock);
85
86 int rtnl_trylock(void)
87 {
88 return mutex_trylock(&rtnl_mutex);
89 }
90 EXPORT_SYMBOL(rtnl_trylock);
91
92 int rtnl_is_locked(void)
93 {
94 return mutex_is_locked(&rtnl_mutex);
95 }
96 EXPORT_SYMBOL(rtnl_is_locked);
97
98 #ifdef CONFIG_PROVE_LOCKING
99 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 + nla_total_size(1); /* IFLA_PROTO_DOWN */
901
902 }
903
904 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
905 {
906 struct nlattr *vf_ports;
907 struct nlattr *vf_port;
908 int vf;
909 int err;
910
911 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
912 if (!vf_ports)
913 return -EMSGSIZE;
914
915 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
916 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
917 if (!vf_port)
918 goto nla_put_failure;
919 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
920 goto nla_put_failure;
921 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
922 if (err == -EMSGSIZE)
923 goto nla_put_failure;
924 if (err) {
925 nla_nest_cancel(skb, vf_port);
926 continue;
927 }
928 nla_nest_end(skb, vf_port);
929 }
930
931 nla_nest_end(skb, vf_ports);
932
933 return 0;
934
935 nla_put_failure:
936 nla_nest_cancel(skb, vf_ports);
937 return -EMSGSIZE;
938 }
939
940 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
941 {
942 struct nlattr *port_self;
943 int err;
944
945 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
946 if (!port_self)
947 return -EMSGSIZE;
948
949 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
950 if (err) {
951 nla_nest_cancel(skb, port_self);
952 return (err == -EMSGSIZE) ? err : 0;
953 }
954
955 nla_nest_end(skb, port_self);
956
957 return 0;
958 }
959
960 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
961 u32 ext_filter_mask)
962 {
963 int err;
964
965 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
966 !(ext_filter_mask & RTEXT_FILTER_VF))
967 return 0;
968
969 err = rtnl_port_self_fill(skb, dev);
970 if (err)
971 return err;
972
973 if (dev_num_vf(dev->dev.parent)) {
974 err = rtnl_vf_ports_fill(skb, dev);
975 if (err)
976 return err;
977 }
978
979 return 0;
980 }
981
982 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
983 {
984 int err;
985 struct netdev_phys_item_id ppid;
986
987 err = dev_get_phys_port_id(dev, &ppid);
988 if (err) {
989 if (err == -EOPNOTSUPP)
990 return 0;
991 return err;
992 }
993
994 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
995 return -EMSGSIZE;
996
997 return 0;
998 }
999
1000 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1001 {
1002 char name[IFNAMSIZ];
1003 int err;
1004
1005 err = dev_get_phys_port_name(dev, name, sizeof(name));
1006 if (err) {
1007 if (err == -EOPNOTSUPP)
1008 return 0;
1009 return err;
1010 }
1011
1012 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
1013 return -EMSGSIZE;
1014
1015 return 0;
1016 }
1017
1018 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1019 {
1020 int err;
1021 struct switchdev_attr attr = {
1022 .id = SWITCHDEV_ATTR_PORT_PARENT_ID,
1023 .flags = SWITCHDEV_F_NO_RECURSE,
1024 };
1025
1026 err = switchdev_port_attr_get(dev, &attr);
1027 if (err) {
1028 if (err == -EOPNOTSUPP)
1029 return 0;
1030 return err;
1031 }
1032
1033 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1034 attr.u.ppid.id))
1035 return -EMSGSIZE;
1036
1037 return 0;
1038 }
1039
1040 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1041 int type, u32 pid, u32 seq, u32 change,
1042 unsigned int flags, u32 ext_filter_mask)
1043 {
1044 struct ifinfomsg *ifm;
1045 struct nlmsghdr *nlh;
1046 struct rtnl_link_stats64 temp;
1047 const struct rtnl_link_stats64 *stats;
1048 struct nlattr *attr, *af_spec;
1049 struct rtnl_af_ops *af_ops;
1050 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1051
1052 ASSERT_RTNL();
1053 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1054 if (nlh == NULL)
1055 return -EMSGSIZE;
1056
1057 ifm = nlmsg_data(nlh);
1058 ifm->ifi_family = AF_UNSPEC;
1059 ifm->__ifi_pad = 0;
1060 ifm->ifi_type = dev->type;
1061 ifm->ifi_index = dev->ifindex;
1062 ifm->ifi_flags = dev_get_flags(dev);
1063 ifm->ifi_change = change;
1064
1065 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1066 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1067 nla_put_u8(skb, IFLA_OPERSTATE,
1068 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1069 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1070 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1071 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1072 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1073 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1074 #ifdef CONFIG_RPS
1075 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1076 #endif
1077 (dev->ifindex != dev_get_iflink(dev) &&
1078 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1079 (upper_dev &&
1080 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1081 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1082 (dev->qdisc &&
1083 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1084 (dev->ifalias &&
1085 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1086 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1087 atomic_read(&dev->carrier_changes)) ||
1088 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1089 goto nla_put_failure;
1090
1091 if (1) {
1092 struct rtnl_link_ifmap map = {
1093 .mem_start = dev->mem_start,
1094 .mem_end = dev->mem_end,
1095 .base_addr = dev->base_addr,
1096 .irq = dev->irq,
1097 .dma = dev->dma,
1098 .port = dev->if_port,
1099 };
1100 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1101 goto nla_put_failure;
1102 }
1103
1104 if (dev->addr_len) {
1105 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1106 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1107 goto nla_put_failure;
1108 }
1109
1110 if (rtnl_phys_port_id_fill(skb, dev))
1111 goto nla_put_failure;
1112
1113 if (rtnl_phys_port_name_fill(skb, dev))
1114 goto nla_put_failure;
1115
1116 if (rtnl_phys_switch_id_fill(skb, dev))
1117 goto nla_put_failure;
1118
1119 attr = nla_reserve(skb, IFLA_STATS,
1120 sizeof(struct rtnl_link_stats));
1121 if (attr == NULL)
1122 goto nla_put_failure;
1123
1124 stats = dev_get_stats(dev, &temp);
1125 copy_rtnl_link_stats(nla_data(attr), stats);
1126
1127 attr = nla_reserve(skb, IFLA_STATS64,
1128 sizeof(struct rtnl_link_stats64));
1129 if (attr == NULL)
1130 goto nla_put_failure;
1131 copy_rtnl_link_stats64(nla_data(attr), stats);
1132
1133 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1134 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1135 goto nla_put_failure;
1136
1137 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1138 && (ext_filter_mask & RTEXT_FILTER_VF)) {
1139 int i;
1140
1141 struct nlattr *vfinfo, *vf, *vfstats;
1142 int num_vfs = dev_num_vf(dev->dev.parent);
1143
1144 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1145 if (!vfinfo)
1146 goto nla_put_failure;
1147 for (i = 0; i < num_vfs; i++) {
1148 struct ifla_vf_info ivi;
1149 struct ifla_vf_mac vf_mac;
1150 struct ifla_vf_vlan vf_vlan;
1151 struct ifla_vf_rate vf_rate;
1152 struct ifla_vf_tx_rate vf_tx_rate;
1153 struct ifla_vf_spoofchk vf_spoofchk;
1154 struct ifla_vf_link_state vf_linkstate;
1155 struct ifla_vf_rss_query_en vf_rss_query_en;
1156 struct ifla_vf_stats vf_stats;
1157
1158 /*
1159 * Not all SR-IOV capable drivers support the
1160 * spoofcheck and "RSS query enable" query. Preset to
1161 * -1 so the user space tool can detect that the driver
1162 * didn't report anything.
1163 */
1164 ivi.spoofchk = -1;
1165 ivi.rss_query_en = -1;
1166 memset(ivi.mac, 0, sizeof(ivi.mac));
1167 /* The default value for VF link state is "auto"
1168 * IFLA_VF_LINK_STATE_AUTO which equals zero
1169 */
1170 ivi.linkstate = 0;
1171 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1172 break;
1173 vf_mac.vf =
1174 vf_vlan.vf =
1175 vf_rate.vf =
1176 vf_tx_rate.vf =
1177 vf_spoofchk.vf =
1178 vf_linkstate.vf =
1179 vf_rss_query_en.vf = ivi.vf;
1180
1181 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1182 vf_vlan.vlan = ivi.vlan;
1183 vf_vlan.qos = ivi.qos;
1184 vf_tx_rate.rate = ivi.max_tx_rate;
1185 vf_rate.min_tx_rate = ivi.min_tx_rate;
1186 vf_rate.max_tx_rate = ivi.max_tx_rate;
1187 vf_spoofchk.setting = ivi.spoofchk;
1188 vf_linkstate.link_state = ivi.linkstate;
1189 vf_rss_query_en.setting = ivi.rss_query_en;
1190 vf = nla_nest_start(skb, IFLA_VF_INFO);
1191 if (!vf) {
1192 nla_nest_cancel(skb, vfinfo);
1193 goto nla_put_failure;
1194 }
1195 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1196 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1197 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1198 &vf_rate) ||
1199 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1200 &vf_tx_rate) ||
1201 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1202 &vf_spoofchk) ||
1203 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1204 &vf_linkstate) ||
1205 nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1206 sizeof(vf_rss_query_en),
1207 &vf_rss_query_en))
1208 goto nla_put_failure;
1209 memset(&vf_stats, 0, sizeof(vf_stats));
1210 if (dev->netdev_ops->ndo_get_vf_stats)
1211 dev->netdev_ops->ndo_get_vf_stats(dev, i,
1212 &vf_stats);
1213 vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1214 if (!vfstats) {
1215 nla_nest_cancel(skb, vf);
1216 nla_nest_cancel(skb, vfinfo);
1217 goto nla_put_failure;
1218 }
1219 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS,
1220 vf_stats.rx_packets) ||
1221 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS,
1222 vf_stats.tx_packets) ||
1223 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES,
1224 vf_stats.rx_bytes) ||
1225 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES,
1226 vf_stats.tx_bytes) ||
1227 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST,
1228 vf_stats.broadcast) ||
1229 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST,
1230 vf_stats.multicast))
1231 goto nla_put_failure;
1232 nla_nest_end(skb, vfstats);
1233 nla_nest_end(skb, vf);
1234 }
1235 nla_nest_end(skb, vfinfo);
1236 }
1237
1238 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1239 goto nla_put_failure;
1240
1241 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1242 if (rtnl_link_fill(skb, dev) < 0)
1243 goto nla_put_failure;
1244 }
1245
1246 if (dev->rtnl_link_ops &&
1247 dev->rtnl_link_ops->get_link_net) {
1248 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1249
1250 if (!net_eq(dev_net(dev), link_net)) {
1251 int id = peernet2id_alloc(dev_net(dev), link_net);
1252
1253 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1254 goto nla_put_failure;
1255 }
1256 }
1257
1258 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1259 goto nla_put_failure;
1260
1261 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1262 if (af_ops->fill_link_af) {
1263 struct nlattr *af;
1264 int err;
1265
1266 if (!(af = nla_nest_start(skb, af_ops->family)))
1267 goto nla_put_failure;
1268
1269 err = af_ops->fill_link_af(skb, dev);
1270
1271 /*
1272 * Caller may return ENODATA to indicate that there
1273 * was no data to be dumped. This is not an error, it
1274 * means we should trim the attribute header and
1275 * continue.
1276 */
1277 if (err == -ENODATA)
1278 nla_nest_cancel(skb, af);
1279 else if (err < 0)
1280 goto nla_put_failure;
1281
1282 nla_nest_end(skb, af);
1283 }
1284 }
1285
1286 nla_nest_end(skb, af_spec);
1287
1288 nlmsg_end(skb, nlh);
1289 return 0;
1290
1291 nla_put_failure:
1292 nlmsg_cancel(skb, nlh);
1293 return -EMSGSIZE;
1294 }
1295
1296 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1297 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1298 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1299 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1300 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1301 [IFLA_MTU] = { .type = NLA_U32 },
1302 [IFLA_LINK] = { .type = NLA_U32 },
1303 [IFLA_MASTER] = { .type = NLA_U32 },
1304 [IFLA_CARRIER] = { .type = NLA_U8 },
1305 [IFLA_TXQLEN] = { .type = NLA_U32 },
1306 [IFLA_WEIGHT] = { .type = NLA_U32 },
1307 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1308 [IFLA_LINKMODE] = { .type = NLA_U8 },
1309 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1310 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1311 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1312 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1313 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1314 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1315 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1316 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1317 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1318 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1319 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1320 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1321 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1322 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1323 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1324 [IFLA_LINK_NETNSID] = { .type = NLA_S32 },
1325 [IFLA_PROTO_DOWN] = { .type = NLA_U8 },
1326 };
1327
1328 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1329 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1330 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1331 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1332 [IFLA_INFO_SLAVE_DATA] = { .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 **tb)
1492 {
1493 const struct net_device_ops *ops = dev->netdev_ops;
1494 int err = -EINVAL;
1495
1496 if (tb[IFLA_VF_MAC]) {
1497 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1498
1499 err = -EOPNOTSUPP;
1500 if (ops->ndo_set_vf_mac)
1501 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1502 ivm->mac);
1503 if (err < 0)
1504 return err;
1505 }
1506
1507 if (tb[IFLA_VF_VLAN]) {
1508 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1509
1510 err = -EOPNOTSUPP;
1511 if (ops->ndo_set_vf_vlan)
1512 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1513 ivv->qos);
1514 if (err < 0)
1515 return err;
1516 }
1517
1518 if (tb[IFLA_VF_TX_RATE]) {
1519 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1520 struct ifla_vf_info ivf;
1521
1522 err = -EOPNOTSUPP;
1523 if (ops->ndo_get_vf_config)
1524 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1525 if (err < 0)
1526 return err;
1527
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 if (err < 0)
1534 return err;
1535 }
1536
1537 if (tb[IFLA_VF_RATE]) {
1538 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1539
1540 err = -EOPNOTSUPP;
1541 if (ops->ndo_set_vf_rate)
1542 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1543 ivt->min_tx_rate,
1544 ivt->max_tx_rate);
1545 if (err < 0)
1546 return err;
1547 }
1548
1549 if (tb[IFLA_VF_SPOOFCHK]) {
1550 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1551
1552 err = -EOPNOTSUPP;
1553 if (ops->ndo_set_vf_spoofchk)
1554 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1555 ivs->setting);
1556 if (err < 0)
1557 return err;
1558 }
1559
1560 if (tb[IFLA_VF_LINK_STATE]) {
1561 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1562
1563 err = -EOPNOTSUPP;
1564 if (ops->ndo_set_vf_link_state)
1565 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1566 ivl->link_state);
1567 if (err < 0)
1568 return err;
1569 }
1570
1571 if (tb[IFLA_VF_RSS_QUERY_EN]) {
1572 struct ifla_vf_rss_query_en *ivrssq_en;
1573
1574 err = -EOPNOTSUPP;
1575 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1576 if (ops->ndo_set_vf_rss_query_en)
1577 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1578 ivrssq_en->setting);
1579 if (err < 0)
1580 return err;
1581 }
1582
1583 return err;
1584 }
1585
1586 static int do_set_master(struct net_device *dev, int ifindex)
1587 {
1588 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1589 const struct net_device_ops *ops;
1590 int err;
1591
1592 if (upper_dev) {
1593 if (upper_dev->ifindex == ifindex)
1594 return 0;
1595 ops = upper_dev->netdev_ops;
1596 if (ops->ndo_del_slave) {
1597 err = ops->ndo_del_slave(upper_dev, dev);
1598 if (err)
1599 return err;
1600 } else {
1601 return -EOPNOTSUPP;
1602 }
1603 }
1604
1605 if (ifindex) {
1606 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1607 if (!upper_dev)
1608 return -EINVAL;
1609 ops = upper_dev->netdev_ops;
1610 if (ops->ndo_add_slave) {
1611 err = ops->ndo_add_slave(upper_dev, dev);
1612 if (err)
1613 return err;
1614 } else {
1615 return -EOPNOTSUPP;
1616 }
1617 }
1618 return 0;
1619 }
1620
1621 #define DO_SETLINK_MODIFIED 0x01
1622 /* notify flag means notify + modified. */
1623 #define DO_SETLINK_NOTIFY 0x03
1624 static int do_setlink(const struct sk_buff *skb,
1625 struct net_device *dev, struct ifinfomsg *ifm,
1626 struct nlattr **tb, char *ifname, int status)
1627 {
1628 const struct net_device_ops *ops = dev->netdev_ops;
1629 int err;
1630
1631 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1632 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1633 if (IS_ERR(net)) {
1634 err = PTR_ERR(net);
1635 goto errout;
1636 }
1637 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1638 put_net(net);
1639 err = -EPERM;
1640 goto errout;
1641 }
1642 err = dev_change_net_namespace(dev, net, ifname);
1643 put_net(net);
1644 if (err)
1645 goto errout;
1646 status |= DO_SETLINK_MODIFIED;
1647 }
1648
1649 if (tb[IFLA_MAP]) {
1650 struct rtnl_link_ifmap *u_map;
1651 struct ifmap k_map;
1652
1653 if (!ops->ndo_set_config) {
1654 err = -EOPNOTSUPP;
1655 goto errout;
1656 }
1657
1658 if (!netif_device_present(dev)) {
1659 err = -ENODEV;
1660 goto errout;
1661 }
1662
1663 u_map = nla_data(tb[IFLA_MAP]);
1664 k_map.mem_start = (unsigned long) u_map->mem_start;
1665 k_map.mem_end = (unsigned long) u_map->mem_end;
1666 k_map.base_addr = (unsigned short) u_map->base_addr;
1667 k_map.irq = (unsigned char) u_map->irq;
1668 k_map.dma = (unsigned char) u_map->dma;
1669 k_map.port = (unsigned char) u_map->port;
1670
1671 err = ops->ndo_set_config(dev, &k_map);
1672 if (err < 0)
1673 goto errout;
1674
1675 status |= DO_SETLINK_NOTIFY;
1676 }
1677
1678 if (tb[IFLA_ADDRESS]) {
1679 struct sockaddr *sa;
1680 int len;
1681
1682 len = sizeof(sa_family_t) + dev->addr_len;
1683 sa = kmalloc(len, GFP_KERNEL);
1684 if (!sa) {
1685 err = -ENOMEM;
1686 goto errout;
1687 }
1688 sa->sa_family = dev->type;
1689 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1690 dev->addr_len);
1691 err = dev_set_mac_address(dev, sa);
1692 kfree(sa);
1693 if (err)
1694 goto errout;
1695 status |= DO_SETLINK_MODIFIED;
1696 }
1697
1698 if (tb[IFLA_MTU]) {
1699 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1700 if (err < 0)
1701 goto errout;
1702 status |= DO_SETLINK_MODIFIED;
1703 }
1704
1705 if (tb[IFLA_GROUP]) {
1706 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1707 status |= DO_SETLINK_NOTIFY;
1708 }
1709
1710 /*
1711 * Interface selected by interface index but interface
1712 * name provided implies that a name change has been
1713 * requested.
1714 */
1715 if (ifm->ifi_index > 0 && ifname[0]) {
1716 err = dev_change_name(dev, ifname);
1717 if (err < 0)
1718 goto errout;
1719 status |= DO_SETLINK_MODIFIED;
1720 }
1721
1722 if (tb[IFLA_IFALIAS]) {
1723 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1724 nla_len(tb[IFLA_IFALIAS]));
1725 if (err < 0)
1726 goto errout;
1727 status |= DO_SETLINK_NOTIFY;
1728 }
1729
1730 if (tb[IFLA_BROADCAST]) {
1731 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1732 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1733 }
1734
1735 if (ifm->ifi_flags || ifm->ifi_change) {
1736 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1737 if (err < 0)
1738 goto errout;
1739 }
1740
1741 if (tb[IFLA_MASTER]) {
1742 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1743 if (err)
1744 goto errout;
1745 status |= DO_SETLINK_MODIFIED;
1746 }
1747
1748 if (tb[IFLA_CARRIER]) {
1749 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1750 if (err)
1751 goto errout;
1752 status |= DO_SETLINK_MODIFIED;
1753 }
1754
1755 if (tb[IFLA_TXQLEN]) {
1756 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1757
1758 if (dev->tx_queue_len ^ value)
1759 status |= DO_SETLINK_NOTIFY;
1760
1761 dev->tx_queue_len = value;
1762 }
1763
1764 if (tb[IFLA_OPERSTATE])
1765 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1766
1767 if (tb[IFLA_LINKMODE]) {
1768 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1769
1770 write_lock_bh(&dev_base_lock);
1771 if (dev->link_mode ^ value)
1772 status |= DO_SETLINK_NOTIFY;
1773 dev->link_mode = value;
1774 write_unlock_bh(&dev_base_lock);
1775 }
1776
1777 if (tb[IFLA_VFINFO_LIST]) {
1778 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
1779 struct nlattr *attr;
1780 int rem;
1781
1782 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1783 if (nla_type(attr) != IFLA_VF_INFO ||
1784 nla_len(attr) < NLA_HDRLEN) {
1785 err = -EINVAL;
1786 goto errout;
1787 }
1788 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
1789 ifla_vf_policy);
1790 if (err < 0)
1791 goto errout;
1792 err = do_setvfinfo(dev, vfinfo);
1793 if (err < 0)
1794 goto errout;
1795 status |= DO_SETLINK_NOTIFY;
1796 }
1797 }
1798 err = 0;
1799
1800 if (tb[IFLA_VF_PORTS]) {
1801 struct nlattr *port[IFLA_PORT_MAX+1];
1802 struct nlattr *attr;
1803 int vf;
1804 int rem;
1805
1806 err = -EOPNOTSUPP;
1807 if (!ops->ndo_set_vf_port)
1808 goto errout;
1809
1810 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1811 if (nla_type(attr) != IFLA_VF_PORT)
1812 continue;
1813 err = nla_parse_nested(port, IFLA_PORT_MAX,
1814 attr, ifla_port_policy);
1815 if (err < 0)
1816 goto errout;
1817 if (!port[IFLA_PORT_VF]) {
1818 err = -EOPNOTSUPP;
1819 goto errout;
1820 }
1821 vf = nla_get_u32(port[IFLA_PORT_VF]);
1822 err = ops->ndo_set_vf_port(dev, vf, port);
1823 if (err < 0)
1824 goto errout;
1825 status |= DO_SETLINK_NOTIFY;
1826 }
1827 }
1828 err = 0;
1829
1830 if (tb[IFLA_PORT_SELF]) {
1831 struct nlattr *port[IFLA_PORT_MAX+1];
1832
1833 err = nla_parse_nested(port, IFLA_PORT_MAX,
1834 tb[IFLA_PORT_SELF], ifla_port_policy);
1835 if (err < 0)
1836 goto errout;
1837
1838 err = -EOPNOTSUPP;
1839 if (ops->ndo_set_vf_port)
1840 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1841 if (err < 0)
1842 goto errout;
1843 status |= DO_SETLINK_NOTIFY;
1844 }
1845
1846 if (tb[IFLA_AF_SPEC]) {
1847 struct nlattr *af;
1848 int rem;
1849
1850 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1851 const struct rtnl_af_ops *af_ops;
1852
1853 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1854 BUG();
1855
1856 err = af_ops->set_link_af(dev, af);
1857 if (err < 0)
1858 goto errout;
1859
1860 status |= DO_SETLINK_NOTIFY;
1861 }
1862 }
1863 err = 0;
1864
1865 if (tb[IFLA_PROTO_DOWN]) {
1866 err = dev_change_proto_down(dev,
1867 nla_get_u8(tb[IFLA_PROTO_DOWN]));
1868 if (err)
1869 goto errout;
1870 status |= DO_SETLINK_NOTIFY;
1871 }
1872
1873 errout:
1874 if (status & DO_SETLINK_MODIFIED) {
1875 if (status & DO_SETLINK_NOTIFY)
1876 netdev_state_change(dev);
1877
1878 if (err < 0)
1879 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",
1880 dev->name);
1881 }
1882
1883 return err;
1884 }
1885
1886 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1887 {
1888 struct net *net = sock_net(skb->sk);
1889 struct ifinfomsg *ifm;
1890 struct net_device *dev;
1891 int err;
1892 struct nlattr *tb[IFLA_MAX+1];
1893 char ifname[IFNAMSIZ];
1894
1895 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1896 if (err < 0)
1897 goto errout;
1898
1899 if (tb[IFLA_IFNAME])
1900 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1901 else
1902 ifname[0] = '\0';
1903
1904 err = -EINVAL;
1905 ifm = nlmsg_data(nlh);
1906 if (ifm->ifi_index > 0)
1907 dev = __dev_get_by_index(net, ifm->ifi_index);
1908 else if (tb[IFLA_IFNAME])
1909 dev = __dev_get_by_name(net, ifname);
1910 else
1911 goto errout;
1912
1913 if (dev == NULL) {
1914 err = -ENODEV;
1915 goto errout;
1916 }
1917
1918 err = validate_linkmsg(dev, tb);
1919 if (err < 0)
1920 goto errout;
1921
1922 err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1923 errout:
1924 return err;
1925 }
1926
1927 static int rtnl_group_dellink(const struct net *net, int group)
1928 {
1929 struct net_device *dev, *aux;
1930 LIST_HEAD(list_kill);
1931 bool found = false;
1932
1933 if (!group)
1934 return -EPERM;
1935
1936 for_each_netdev(net, dev) {
1937 if (dev->group == group) {
1938 const struct rtnl_link_ops *ops;
1939
1940 found = true;
1941 ops = dev->rtnl_link_ops;
1942 if (!ops || !ops->dellink)
1943 return -EOPNOTSUPP;
1944 }
1945 }
1946
1947 if (!found)
1948 return -ENODEV;
1949
1950 for_each_netdev_safe(net, dev, aux) {
1951 if (dev->group == group) {
1952 const struct rtnl_link_ops *ops;
1953
1954 ops = dev->rtnl_link_ops;
1955 ops->dellink(dev, &list_kill);
1956 }
1957 }
1958 unregister_netdevice_many(&list_kill);
1959
1960 return 0;
1961 }
1962
1963 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1964 {
1965 struct net *net = sock_net(skb->sk);
1966 const struct rtnl_link_ops *ops;
1967 struct net_device *dev;
1968 struct ifinfomsg *ifm;
1969 char ifname[IFNAMSIZ];
1970 struct nlattr *tb[IFLA_MAX+1];
1971 int err;
1972 LIST_HEAD(list_kill);
1973
1974 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1975 if (err < 0)
1976 return err;
1977
1978 if (tb[IFLA_IFNAME])
1979 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1980
1981 ifm = nlmsg_data(nlh);
1982 if (ifm->ifi_index > 0)
1983 dev = __dev_get_by_index(net, ifm->ifi_index);
1984 else if (tb[IFLA_IFNAME])
1985 dev = __dev_get_by_name(net, ifname);
1986 else if (tb[IFLA_GROUP])
1987 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
1988 else
1989 return -EINVAL;
1990
1991 if (!dev)
1992 return -ENODEV;
1993
1994 ops = dev->rtnl_link_ops;
1995 if (!ops || !ops->dellink)
1996 return -EOPNOTSUPP;
1997
1998 ops->dellink(dev, &list_kill);
1999 unregister_netdevice_many(&list_kill);
2000 return 0;
2001 }
2002
2003 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2004 {
2005 unsigned int old_flags;
2006 int err;
2007
2008 old_flags = dev->flags;
2009 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2010 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2011 if (err < 0)
2012 return err;
2013 }
2014
2015 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2016
2017 __dev_notify_flags(dev, old_flags, ~0U);
2018 return 0;
2019 }
2020 EXPORT_SYMBOL(rtnl_configure_link);
2021
2022 struct net_device *rtnl_create_link(struct net *net,
2023 const char *ifname, unsigned char name_assign_type,
2024 const struct rtnl_link_ops *ops, struct nlattr *tb[])
2025 {
2026 int err;
2027 struct net_device *dev;
2028 unsigned int num_tx_queues = 1;
2029 unsigned int num_rx_queues = 1;
2030
2031 if (tb[IFLA_NUM_TX_QUEUES])
2032 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2033 else if (ops->get_num_tx_queues)
2034 num_tx_queues = ops->get_num_tx_queues();
2035
2036 if (tb[IFLA_NUM_RX_QUEUES])
2037 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2038 else if (ops->get_num_rx_queues)
2039 num_rx_queues = ops->get_num_rx_queues();
2040
2041 err = -ENOMEM;
2042 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2043 ops->setup, num_tx_queues, num_rx_queues);
2044 if (!dev)
2045 goto err;
2046
2047 dev_net_set(dev, net);
2048 dev->rtnl_link_ops = ops;
2049 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2050
2051 if (tb[IFLA_MTU])
2052 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2053 if (tb[IFLA_ADDRESS]) {
2054 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2055 nla_len(tb[IFLA_ADDRESS]));
2056 dev->addr_assign_type = NET_ADDR_SET;
2057 }
2058 if (tb[IFLA_BROADCAST])
2059 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2060 nla_len(tb[IFLA_BROADCAST]));
2061 if (tb[IFLA_TXQLEN])
2062 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2063 if (tb[IFLA_OPERSTATE])
2064 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2065 if (tb[IFLA_LINKMODE])
2066 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2067 if (tb[IFLA_GROUP])
2068 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2069
2070 return dev;
2071
2072 err:
2073 return ERR_PTR(err);
2074 }
2075 EXPORT_SYMBOL(rtnl_create_link);
2076
2077 static int rtnl_group_changelink(const struct sk_buff *skb,
2078 struct net *net, int group,
2079 struct ifinfomsg *ifm,
2080 struct nlattr **tb)
2081 {
2082 struct net_device *dev, *aux;
2083 int err;
2084
2085 for_each_netdev_safe(net, dev, aux) {
2086 if (dev->group == group) {
2087 err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2088 if (err < 0)
2089 return err;
2090 }
2091 }
2092
2093 return 0;
2094 }
2095
2096 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2097 {
2098 struct net *net = sock_net(skb->sk);
2099 const struct rtnl_link_ops *ops;
2100 const struct rtnl_link_ops *m_ops = NULL;
2101 struct net_device *dev;
2102 struct net_device *master_dev = NULL;
2103 struct ifinfomsg *ifm;
2104 char kind[MODULE_NAME_LEN];
2105 char ifname[IFNAMSIZ];
2106 struct nlattr *tb[IFLA_MAX+1];
2107 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2108 unsigned char name_assign_type = NET_NAME_USER;
2109 int err;
2110
2111 #ifdef CONFIG_MODULES
2112 replay:
2113 #endif
2114 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2115 if (err < 0)
2116 return err;
2117
2118 if (tb[IFLA_IFNAME])
2119 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2120 else
2121 ifname[0] = '\0';
2122
2123 ifm = nlmsg_data(nlh);
2124 if (ifm->ifi_index > 0)
2125 dev = __dev_get_by_index(net, ifm->ifi_index);
2126 else {
2127 if (ifname[0])
2128 dev = __dev_get_by_name(net, ifname);
2129 else
2130 dev = NULL;
2131 }
2132
2133 if (dev) {
2134 master_dev = netdev_master_upper_dev_get(dev);
2135 if (master_dev)
2136 m_ops = master_dev->rtnl_link_ops;
2137 }
2138
2139 err = validate_linkmsg(dev, tb);
2140 if (err < 0)
2141 return err;
2142
2143 if (tb[IFLA_LINKINFO]) {
2144 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2145 tb[IFLA_LINKINFO], ifla_info_policy);
2146 if (err < 0)
2147 return err;
2148 } else
2149 memset(linkinfo, 0, sizeof(linkinfo));
2150
2151 if (linkinfo[IFLA_INFO_KIND]) {
2152 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2153 ops = rtnl_link_ops_get(kind);
2154 } else {
2155 kind[0] = '\0';
2156 ops = NULL;
2157 }
2158
2159 if (1) {
2160 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2161 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2162 struct nlattr **data = NULL;
2163 struct nlattr **slave_data = NULL;
2164 struct net *dest_net, *link_net = NULL;
2165
2166 if (ops) {
2167 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2168 err = nla_parse_nested(attr, ops->maxtype,
2169 linkinfo[IFLA_INFO_DATA],
2170 ops->policy);
2171 if (err < 0)
2172 return err;
2173 data = attr;
2174 }
2175 if (ops->validate) {
2176 err = ops->validate(tb, data);
2177 if (err < 0)
2178 return err;
2179 }
2180 }
2181
2182 if (m_ops) {
2183 if (m_ops->slave_maxtype &&
2184 linkinfo[IFLA_INFO_SLAVE_DATA]) {
2185 err = nla_parse_nested(slave_attr,
2186 m_ops->slave_maxtype,
2187 linkinfo[IFLA_INFO_SLAVE_DATA],
2188 m_ops->slave_policy);
2189 if (err < 0)
2190 return err;
2191 slave_data = slave_attr;
2192 }
2193 if (m_ops->slave_validate) {
2194 err = m_ops->slave_validate(tb, slave_data);
2195 if (err < 0)
2196 return err;
2197 }
2198 }
2199
2200 if (dev) {
2201 int status = 0;
2202
2203 if (nlh->nlmsg_flags & NLM_F_EXCL)
2204 return -EEXIST;
2205 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2206 return -EOPNOTSUPP;
2207
2208 if (linkinfo[IFLA_INFO_DATA]) {
2209 if (!ops || ops != dev->rtnl_link_ops ||
2210 !ops->changelink)
2211 return -EOPNOTSUPP;
2212
2213 err = ops->changelink(dev, tb, data);
2214 if (err < 0)
2215 return err;
2216 status |= DO_SETLINK_NOTIFY;
2217 }
2218
2219 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2220 if (!m_ops || !m_ops->slave_changelink)
2221 return -EOPNOTSUPP;
2222
2223 err = m_ops->slave_changelink(master_dev, dev,
2224 tb, slave_data);
2225 if (err < 0)
2226 return err;
2227 status |= DO_SETLINK_NOTIFY;
2228 }
2229
2230 return do_setlink(skb, dev, ifm, tb, ifname, status);
2231 }
2232
2233 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2234 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2235 return rtnl_group_changelink(skb, net,
2236 nla_get_u32(tb[IFLA_GROUP]),
2237 ifm, tb);
2238 return -ENODEV;
2239 }
2240
2241 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2242 return -EOPNOTSUPP;
2243
2244 if (!ops) {
2245 #ifdef CONFIG_MODULES
2246 if (kind[0]) {
2247 __rtnl_unlock();
2248 request_module("rtnl-link-%s", kind);
2249 rtnl_lock();
2250 ops = rtnl_link_ops_get(kind);
2251 if (ops)
2252 goto replay;
2253 }
2254 #endif
2255 return -EOPNOTSUPP;
2256 }
2257
2258 if (!ops->setup)
2259 return -EOPNOTSUPP;
2260
2261 if (!ifname[0]) {
2262 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2263 name_assign_type = NET_NAME_ENUM;
2264 }
2265
2266 dest_net = rtnl_link_get_net(net, tb);
2267 if (IS_ERR(dest_net))
2268 return PTR_ERR(dest_net);
2269
2270 err = -EPERM;
2271 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2272 goto out;
2273
2274 if (tb[IFLA_LINK_NETNSID]) {
2275 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2276
2277 link_net = get_net_ns_by_id(dest_net, id);
2278 if (!link_net) {
2279 err = -EINVAL;
2280 goto out;
2281 }
2282 err = -EPERM;
2283 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2284 goto out;
2285 }
2286
2287 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2288 name_assign_type, ops, tb);
2289 if (IS_ERR(dev)) {
2290 err = PTR_ERR(dev);
2291 goto out;
2292 }
2293
2294 dev->ifindex = ifm->ifi_index;
2295
2296 if (ops->newlink) {
2297 err = ops->newlink(link_net ? : net, dev, tb, data);
2298 /* Drivers should call free_netdev() in ->destructor
2299 * and unregister it on failure after registration
2300 * so that device could be finally freed in rtnl_unlock.
2301 */
2302 if (err < 0) {
2303 /* If device is not registered at all, free it now */
2304 if (dev->reg_state == NETREG_UNINITIALIZED)
2305 free_netdev(dev);
2306 goto out;
2307 }
2308 } else {
2309 err = register_netdevice(dev);
2310 if (err < 0) {
2311 free_netdev(dev);
2312 goto out;
2313 }
2314 }
2315 err = rtnl_configure_link(dev, ifm);
2316 if (err < 0)
2317 goto out_unregister;
2318 if (link_net) {
2319 err = dev_change_net_namespace(dev, dest_net, ifname);
2320 if (err < 0)
2321 goto out_unregister;
2322 }
2323 out:
2324 if (link_net)
2325 put_net(link_net);
2326 put_net(dest_net);
2327 return err;
2328 out_unregister:
2329 if (ops->newlink) {
2330 LIST_HEAD(list_kill);
2331
2332 ops->dellink(dev, &list_kill);
2333 unregister_netdevice_many(&list_kill);
2334 } else {
2335 unregister_netdevice(dev);
2336 }
2337 goto out;
2338 }
2339 }
2340
2341 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2342 {
2343 struct net *net = sock_net(skb->sk);
2344 struct ifinfomsg *ifm;
2345 char ifname[IFNAMSIZ];
2346 struct nlattr *tb[IFLA_MAX+1];
2347 struct net_device *dev = NULL;
2348 struct sk_buff *nskb;
2349 int err;
2350 u32 ext_filter_mask = 0;
2351
2352 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2353 if (err < 0)
2354 return err;
2355
2356 if (tb[IFLA_IFNAME])
2357 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2358
2359 if (tb[IFLA_EXT_MASK])
2360 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2361
2362 ifm = nlmsg_data(nlh);
2363 if (ifm->ifi_index > 0)
2364 dev = __dev_get_by_index(net, ifm->ifi_index);
2365 else if (tb[IFLA_IFNAME])
2366 dev = __dev_get_by_name(net, ifname);
2367 else
2368 return -EINVAL;
2369
2370 if (dev == NULL)
2371 return -ENODEV;
2372
2373 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2374 if (nskb == NULL)
2375 return -ENOBUFS;
2376
2377 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2378 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2379 if (err < 0) {
2380 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2381 WARN_ON(err == -EMSGSIZE);
2382 kfree_skb(nskb);
2383 } else
2384 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2385
2386 return err;
2387 }
2388
2389 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2390 {
2391 struct net *net = sock_net(skb->sk);
2392 struct net_device *dev;
2393 struct nlattr *tb[IFLA_MAX+1];
2394 u32 ext_filter_mask = 0;
2395 u16 min_ifinfo_dump_size = 0;
2396 int hdrlen;
2397
2398 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2399 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2400 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2401
2402 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2403 if (tb[IFLA_EXT_MASK])
2404 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2405 }
2406
2407 if (!ext_filter_mask)
2408 return NLMSG_GOODSIZE;
2409 /*
2410 * traverse the list of net devices and compute the minimum
2411 * buffer size based upon the filter mask.
2412 */
2413 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2414 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2415 if_nlmsg_size(dev,
2416 ext_filter_mask));
2417 }
2418
2419 return min_ifinfo_dump_size;
2420 }
2421
2422 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2423 {
2424 int idx;
2425 int s_idx = cb->family;
2426
2427 if (s_idx == 0)
2428 s_idx = 1;
2429 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2430 int type = cb->nlh->nlmsg_type-RTM_BASE;
2431 if (idx < s_idx || idx == PF_PACKET)
2432 continue;
2433 if (rtnl_msg_handlers[idx] == NULL ||
2434 rtnl_msg_handlers[idx][type].dumpit == NULL)
2435 continue;
2436 if (idx > s_idx) {
2437 memset(&cb->args[0], 0, sizeof(cb->args));
2438 cb->prev_seq = 0;
2439 cb->seq = 0;
2440 }
2441 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2442 break;
2443 }
2444 cb->family = idx;
2445
2446 return skb->len;
2447 }
2448
2449 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2450 unsigned int change, gfp_t flags)
2451 {
2452 struct net *net = dev_net(dev);
2453 struct sk_buff *skb;
2454 int err = -ENOBUFS;
2455 size_t if_info_size;
2456
2457 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2458 if (skb == NULL)
2459 goto errout;
2460
2461 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2462 if (err < 0) {
2463 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2464 WARN_ON(err == -EMSGSIZE);
2465 kfree_skb(skb);
2466 goto errout;
2467 }
2468 return skb;
2469 errout:
2470 if (err < 0)
2471 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2472 return NULL;
2473 }
2474
2475 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2476 {
2477 struct net *net = dev_net(dev);
2478
2479 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2480 }
2481
2482 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2483 gfp_t flags)
2484 {
2485 struct sk_buff *skb;
2486
2487 if (dev->reg_state != NETREG_REGISTERED)
2488 return;
2489
2490 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2491 if (skb)
2492 rtmsg_ifinfo_send(skb, dev, flags);
2493 }
2494 EXPORT_SYMBOL(rtmsg_ifinfo);
2495
2496 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2497 struct net_device *dev,
2498 u8 *addr, u16 vid, u32 pid, u32 seq,
2499 int type, unsigned int flags,
2500 int nlflags)
2501 {
2502 struct nlmsghdr *nlh;
2503 struct ndmsg *ndm;
2504
2505 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2506 if (!nlh)
2507 return -EMSGSIZE;
2508
2509 ndm = nlmsg_data(nlh);
2510 ndm->ndm_family = AF_BRIDGE;
2511 ndm->ndm_pad1 = 0;
2512 ndm->ndm_pad2 = 0;
2513 ndm->ndm_flags = flags;
2514 ndm->ndm_type = 0;
2515 ndm->ndm_ifindex = dev->ifindex;
2516 ndm->ndm_state = NUD_PERMANENT;
2517
2518 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2519 goto nla_put_failure;
2520 if (vid)
2521 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2522 goto nla_put_failure;
2523
2524 nlmsg_end(skb, nlh);
2525 return 0;
2526
2527 nla_put_failure:
2528 nlmsg_cancel(skb, nlh);
2529 return -EMSGSIZE;
2530 }
2531
2532 static inline size_t rtnl_fdb_nlmsg_size(void)
2533 {
2534 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2535 }
2536
2537 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type)
2538 {
2539 struct net *net = dev_net(dev);
2540 struct sk_buff *skb;
2541 int err = -ENOBUFS;
2542
2543 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2544 if (!skb)
2545 goto errout;
2546
2547 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2548 0, 0, type, NTF_SELF, 0);
2549 if (err < 0) {
2550 kfree_skb(skb);
2551 goto errout;
2552 }
2553
2554 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2555 return;
2556 errout:
2557 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2558 }
2559
2560 /**
2561 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2562 */
2563 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2564 struct nlattr *tb[],
2565 struct net_device *dev,
2566 const unsigned char *addr, u16 vid,
2567 u16 flags)
2568 {
2569 int err = -EINVAL;
2570
2571 /* If aging addresses are supported device will need to
2572 * implement its own handler for this.
2573 */
2574 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2575 pr_info("%s: FDB only supports static addresses\n", dev->name);
2576 return err;
2577 }
2578
2579 if (vid) {
2580 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2581 return err;
2582 }
2583
2584 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2585 err = dev_uc_add_excl(dev, addr);
2586 else if (is_multicast_ether_addr(addr))
2587 err = dev_mc_add_excl(dev, addr);
2588
2589 /* Only return duplicate errors if NLM_F_EXCL is set */
2590 if (err == -EEXIST && !(flags & NLM_F_EXCL))
2591 err = 0;
2592
2593 return err;
2594 }
2595 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2596
2597 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2598 {
2599 u16 vid = 0;
2600
2601 if (vlan_attr) {
2602 if (nla_len(vlan_attr) != sizeof(u16)) {
2603 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2604 return -EINVAL;
2605 }
2606
2607 vid = nla_get_u16(vlan_attr);
2608
2609 if (!vid || vid >= VLAN_VID_MASK) {
2610 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2611 vid);
2612 return -EINVAL;
2613 }
2614 }
2615 *p_vid = vid;
2616 return 0;
2617 }
2618
2619 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2620 {
2621 struct net *net = sock_net(skb->sk);
2622 struct ndmsg *ndm;
2623 struct nlattr *tb[NDA_MAX+1];
2624 struct net_device *dev;
2625 u8 *addr;
2626 u16 vid;
2627 int err;
2628
2629 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2630 if (err < 0)
2631 return err;
2632
2633 ndm = nlmsg_data(nlh);
2634 if (ndm->ndm_ifindex == 0) {
2635 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2636 return -EINVAL;
2637 }
2638
2639 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2640 if (dev == NULL) {
2641 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2642 return -ENODEV;
2643 }
2644
2645 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2646 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2647 return -EINVAL;
2648 }
2649
2650 addr = nla_data(tb[NDA_LLADDR]);
2651
2652 err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2653 if (err)
2654 return err;
2655
2656 err = -EOPNOTSUPP;
2657
2658 /* Support fdb on master device the net/bridge default case */
2659 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2660 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2661 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2662 const struct net_device_ops *ops = br_dev->netdev_ops;
2663
2664 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2665 nlh->nlmsg_flags);
2666 if (err)
2667 goto out;
2668 else
2669 ndm->ndm_flags &= ~NTF_MASTER;
2670 }
2671
2672 /* Embedded bridge, macvlan, and any other device support */
2673 if ((ndm->ndm_flags & NTF_SELF)) {
2674 if (dev->netdev_ops->ndo_fdb_add)
2675 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2676 vid,
2677 nlh->nlmsg_flags);
2678 else
2679 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2680 nlh->nlmsg_flags);
2681
2682 if (!err) {
2683 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH);
2684 ndm->ndm_flags &= ~NTF_SELF;
2685 }
2686 }
2687 out:
2688 return err;
2689 }
2690
2691 /**
2692 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2693 */
2694 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2695 struct nlattr *tb[],
2696 struct net_device *dev,
2697 const unsigned char *addr, u16 vid)
2698 {
2699 int err = -EINVAL;
2700
2701 /* If aging addresses are supported device will need to
2702 * implement its own handler for this.
2703 */
2704 if (!(ndm->ndm_state & NUD_PERMANENT)) {
2705 pr_info("%s: FDB only supports static addresses\n", dev->name);
2706 return err;
2707 }
2708
2709 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2710 err = dev_uc_del(dev, addr);
2711 else if (is_multicast_ether_addr(addr))
2712 err = dev_mc_del(dev, addr);
2713
2714 return err;
2715 }
2716 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2717
2718 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2719 {
2720 struct net *net = sock_net(skb->sk);
2721 struct ndmsg *ndm;
2722 struct nlattr *tb[NDA_MAX+1];
2723 struct net_device *dev;
2724 int err = -EINVAL;
2725 __u8 *addr;
2726 u16 vid;
2727
2728 if (!netlink_capable(skb, CAP_NET_ADMIN))
2729 return -EPERM;
2730
2731 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2732 if (err < 0)
2733 return err;
2734
2735 ndm = nlmsg_data(nlh);
2736 if (ndm->ndm_ifindex == 0) {
2737 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2738 return -EINVAL;
2739 }
2740
2741 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2742 if (dev == NULL) {
2743 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2744 return -ENODEV;
2745 }
2746
2747 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2748 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2749 return -EINVAL;
2750 }
2751
2752 addr = nla_data(tb[NDA_LLADDR]);
2753
2754 err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2755 if (err)
2756 return err;
2757
2758 err = -EOPNOTSUPP;
2759
2760 /* Support fdb on master device the net/bridge default case */
2761 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2762 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2763 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2764 const struct net_device_ops *ops = br_dev->netdev_ops;
2765
2766 if (ops->ndo_fdb_del)
2767 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
2768
2769 if (err)
2770 goto out;
2771 else
2772 ndm->ndm_flags &= ~NTF_MASTER;
2773 }
2774
2775 /* Embedded bridge, macvlan, and any other device support */
2776 if (ndm->ndm_flags & NTF_SELF) {
2777 if (dev->netdev_ops->ndo_fdb_del)
2778 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
2779 vid);
2780 else
2781 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
2782
2783 if (!err) {
2784 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH);
2785 ndm->ndm_flags &= ~NTF_SELF;
2786 }
2787 }
2788 out:
2789 return err;
2790 }
2791
2792 static int nlmsg_populate_fdb(struct sk_buff *skb,
2793 struct netlink_callback *cb,
2794 struct net_device *dev,
2795 int *idx,
2796 struct netdev_hw_addr_list *list)
2797 {
2798 struct netdev_hw_addr *ha;
2799 int err;
2800 u32 portid, seq;
2801
2802 portid = NETLINK_CB(cb->skb).portid;
2803 seq = cb->nlh->nlmsg_seq;
2804
2805 list_for_each_entry(ha, &list->list, list) {
2806 if (*idx < cb->args[0])
2807 goto skip;
2808
2809 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
2810 portid, seq,
2811 RTM_NEWNEIGH, NTF_SELF,
2812 NLM_F_MULTI);
2813 if (err < 0)
2814 return err;
2815 skip:
2816 *idx += 1;
2817 }
2818 return 0;
2819 }
2820
2821 /**
2822 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2823 * @nlh: netlink message header
2824 * @dev: netdevice
2825 *
2826 * Default netdevice operation to dump the existing unicast address list.
2827 * Returns number of addresses from list put in skb.
2828 */
2829 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2830 struct netlink_callback *cb,
2831 struct net_device *dev,
2832 struct net_device *filter_dev,
2833 int idx)
2834 {
2835 int err;
2836
2837 netif_addr_lock_bh(dev);
2838 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2839 if (err)
2840 goto out;
2841 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2842 out:
2843 netif_addr_unlock_bh(dev);
2844 return idx;
2845 }
2846 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2847
2848 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2849 {
2850 struct net_device *dev;
2851 struct nlattr *tb[IFLA_MAX+1];
2852 struct net_device *br_dev = NULL;
2853 const struct net_device_ops *ops = NULL;
2854 const struct net_device_ops *cops = NULL;
2855 struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2856 struct net *net = sock_net(skb->sk);
2857 int brport_idx = 0;
2858 int br_idx = 0;
2859 int idx = 0;
2860
2861 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2862 ifla_policy) == 0) {
2863 if (tb[IFLA_MASTER])
2864 br_idx = nla_get_u32(tb[IFLA_MASTER]);
2865 }
2866
2867 brport_idx = ifm->ifi_index;
2868
2869 if (br_idx) {
2870 br_dev = __dev_get_by_index(net, br_idx);
2871 if (!br_dev)
2872 return -ENODEV;
2873
2874 ops = br_dev->netdev_ops;
2875 }
2876
2877 for_each_netdev(net, dev) {
2878 if (brport_idx && (dev->ifindex != brport_idx))
2879 continue;
2880
2881 if (!br_idx) { /* user did not specify a specific bridge */
2882 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2883 br_dev = netdev_master_upper_dev_get(dev);
2884 cops = br_dev->netdev_ops;
2885 }
2886
2887 } else {
2888 if (dev != br_dev &&
2889 !(dev->priv_flags & IFF_BRIDGE_PORT))
2890 continue;
2891
2892 if (br_dev != netdev_master_upper_dev_get(dev) &&
2893 !(dev->priv_flags & IFF_EBRIDGE))
2894 continue;
2895
2896 cops = ops;
2897 }
2898
2899 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2900 if (cops && cops->ndo_fdb_dump)
2901 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2902 idx);
2903 }
2904
2905 if (dev->netdev_ops->ndo_fdb_dump)
2906 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
2907 idx);
2908 else
2909 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2910
2911 cops = NULL;
2912 }
2913
2914 cb->args[0] = idx;
2915 return skb->len;
2916 }
2917
2918 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
2919 unsigned int attrnum, unsigned int flag)
2920 {
2921 if (mask & flag)
2922 return nla_put_u8(skb, attrnum, !!(flags & flag));
2923 return 0;
2924 }
2925
2926 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2927 struct net_device *dev, u16 mode,
2928 u32 flags, u32 mask, int nlflags,
2929 u32 filter_mask,
2930 int (*vlan_fill)(struct sk_buff *skb,
2931 struct net_device *dev,
2932 u32 filter_mask))
2933 {
2934 struct nlmsghdr *nlh;
2935 struct ifinfomsg *ifm;
2936 struct nlattr *br_afspec;
2937 struct nlattr *protinfo;
2938 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2939 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2940 int err = 0;
2941
2942 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
2943 if (nlh == NULL)
2944 return -EMSGSIZE;
2945
2946 ifm = nlmsg_data(nlh);
2947 ifm->ifi_family = AF_BRIDGE;
2948 ifm->__ifi_pad = 0;
2949 ifm->ifi_type = dev->type;
2950 ifm->ifi_index = dev->ifindex;
2951 ifm->ifi_flags = dev_get_flags(dev);
2952 ifm->ifi_change = 0;
2953
2954
2955 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2956 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2957 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2958 (br_dev &&
2959 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2960 (dev->addr_len &&
2961 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2962 (dev->ifindex != dev_get_iflink(dev) &&
2963 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
2964 goto nla_put_failure;
2965
2966 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2967 if (!br_afspec)
2968 goto nla_put_failure;
2969
2970 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
2971 nla_nest_cancel(skb, br_afspec);
2972 goto nla_put_failure;
2973 }
2974
2975 if (mode != BRIDGE_MODE_UNDEF) {
2976 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2977 nla_nest_cancel(skb, br_afspec);
2978 goto nla_put_failure;
2979 }
2980 }
2981 if (vlan_fill) {
2982 err = vlan_fill(skb, dev, filter_mask);
2983 if (err) {
2984 nla_nest_cancel(skb, br_afspec);
2985 goto nla_put_failure;
2986 }
2987 }
2988 nla_nest_end(skb, br_afspec);
2989
2990 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
2991 if (!protinfo)
2992 goto nla_put_failure;
2993
2994 if (brport_nla_put_flag(skb, flags, mask,
2995 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
2996 brport_nla_put_flag(skb, flags, mask,
2997 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
2998 brport_nla_put_flag(skb, flags, mask,
2999 IFLA_BRPORT_FAST_LEAVE,
3000 BR_MULTICAST_FAST_LEAVE) ||
3001 brport_nla_put_flag(skb, flags, mask,
3002 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3003 brport_nla_put_flag(skb, flags, mask,
3004 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3005 brport_nla_put_flag(skb, flags, mask,
3006 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3007 brport_nla_put_flag(skb, flags, mask,
3008 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3009 brport_nla_put_flag(skb, flags, mask,
3010 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3011 nla_nest_cancel(skb, protinfo);
3012 goto nla_put_failure;
3013 }
3014
3015 nla_nest_end(skb, protinfo);
3016
3017 nlmsg_end(skb, nlh);
3018 return 0;
3019 nla_put_failure:
3020 nlmsg_cancel(skb, nlh);
3021 return err ? err : -EMSGSIZE;
3022 }
3023 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3024
3025 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3026 {
3027 struct net *net = sock_net(skb->sk);
3028 struct net_device *dev;
3029 int idx = 0;
3030 u32 portid = NETLINK_CB(cb->skb).portid;
3031 u32 seq = cb->nlh->nlmsg_seq;
3032 u32 filter_mask = 0;
3033
3034 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3035 struct nlattr *extfilt;
3036
3037 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3038 IFLA_EXT_MASK);
3039 if (extfilt) {
3040 if (nla_len(extfilt) < sizeof(filter_mask))
3041 return -EINVAL;
3042
3043 filter_mask = nla_get_u32(extfilt);
3044 }
3045 }
3046
3047 rcu_read_lock();
3048 for_each_netdev_rcu(net, dev) {
3049 const struct net_device_ops *ops = dev->netdev_ops;
3050 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3051
3052 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3053 if (idx >= cb->args[0] &&
3054 br_dev->netdev_ops->ndo_bridge_getlink(
3055 skb, portid, seq, dev, filter_mask,
3056 NLM_F_MULTI) < 0)
3057 break;
3058 idx++;
3059 }
3060
3061 if (ops->ndo_bridge_getlink) {
3062 if (idx >= cb->args[0] &&
3063 ops->ndo_bridge_getlink(skb, portid, seq, dev,
3064 filter_mask,
3065 NLM_F_MULTI) < 0)
3066 break;
3067 idx++;
3068 }
3069 }
3070 rcu_read_unlock();
3071 cb->args[0] = idx;
3072
3073 return skb->len;
3074 }
3075
3076 static inline size_t bridge_nlmsg_size(void)
3077 {
3078 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3079 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3080 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3081 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
3082 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
3083 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
3084 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
3085 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
3086 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3087 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
3088 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
3089 }
3090
3091 static int rtnl_bridge_notify(struct net_device *dev)
3092 {
3093 struct net *net = dev_net(dev);
3094 struct sk_buff *skb;
3095 int err = -EOPNOTSUPP;
3096
3097 if (!dev->netdev_ops->ndo_bridge_getlink)
3098 return 0;
3099
3100 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3101 if (!skb) {
3102 err = -ENOMEM;
3103 goto errout;
3104 }
3105
3106 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3107 if (err < 0)
3108 goto errout;
3109
3110 if (!skb->len)
3111 goto errout;
3112
3113 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3114 return 0;
3115 errout:
3116 WARN_ON(err == -EMSGSIZE);
3117 kfree_skb(skb);
3118 if (err)
3119 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3120 return err;
3121 }
3122
3123 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3124 {
3125 struct net *net = sock_net(skb->sk);
3126 struct ifinfomsg *ifm;
3127 struct net_device *dev;
3128 struct nlattr *br_spec, *attr = NULL;
3129 int rem, err = -EOPNOTSUPP;
3130 u16 flags = 0;
3131 bool have_flags = false;
3132
3133 if (nlmsg_len(nlh) < sizeof(*ifm))
3134 return -EINVAL;
3135
3136 ifm = nlmsg_data(nlh);
3137 if (ifm->ifi_family != AF_BRIDGE)
3138 return -EPFNOSUPPORT;
3139
3140 dev = __dev_get_by_index(net, ifm->ifi_index);
3141 if (!dev) {
3142 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3143 return -ENODEV;
3144 }
3145
3146 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3147 if (br_spec) {
3148 nla_for_each_nested(attr, br_spec, rem) {
3149 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3150 if (nla_len(attr) < sizeof(flags))
3151 return -EINVAL;
3152
3153 have_flags = true;
3154 flags = nla_get_u16(attr);
3155 break;
3156 }
3157 }
3158 }
3159
3160 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3161 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3162
3163 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3164 err = -EOPNOTSUPP;
3165 goto out;
3166 }
3167
3168 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3169 if (err)
3170 goto out;
3171
3172 flags &= ~BRIDGE_FLAGS_MASTER;
3173 }
3174
3175 if ((flags & BRIDGE_FLAGS_SELF)) {
3176 if (!dev->netdev_ops->ndo_bridge_setlink)
3177 err = -EOPNOTSUPP;
3178 else
3179 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3180 flags);
3181 if (!err) {
3182 flags &= ~BRIDGE_FLAGS_SELF;
3183
3184 /* Generate event to notify upper layer of bridge
3185 * change
3186 */
3187 err = rtnl_bridge_notify(dev);
3188 }
3189 }
3190
3191 if (have_flags)
3192 memcpy(nla_data(attr), &flags, sizeof(flags));
3193 out:
3194 return err;
3195 }
3196
3197 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3198 {
3199 struct net *net = sock_net(skb->sk);
3200 struct ifinfomsg *ifm;
3201 struct net_device *dev;
3202 struct nlattr *br_spec, *attr = NULL;
3203 int rem, err = -EOPNOTSUPP;
3204 u16 flags = 0;
3205 bool have_flags = false;
3206
3207 if (nlmsg_len(nlh) < sizeof(*ifm))
3208 return -EINVAL;
3209
3210 ifm = nlmsg_data(nlh);
3211 if (ifm->ifi_family != AF_BRIDGE)
3212 return -EPFNOSUPPORT;
3213
3214 dev = __dev_get_by_index(net, ifm->ifi_index);
3215 if (!dev) {
3216 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3217 return -ENODEV;
3218 }
3219
3220 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3221 if (br_spec) {
3222 nla_for_each_nested(attr, br_spec, rem) {
3223 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3224 if (nla_len(attr) < sizeof(flags))
3225 return -EINVAL;
3226
3227 have_flags = true;
3228 flags = nla_get_u16(attr);
3229 break;
3230 }
3231 }
3232 }
3233
3234 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3235 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3236
3237 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3238 err = -EOPNOTSUPP;
3239 goto out;
3240 }
3241
3242 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3243 if (err)
3244 goto out;
3245
3246 flags &= ~BRIDGE_FLAGS_MASTER;
3247 }
3248
3249 if ((flags & BRIDGE_FLAGS_SELF)) {
3250 if (!dev->netdev_ops->ndo_bridge_dellink)
3251 err = -EOPNOTSUPP;
3252 else
3253 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3254 flags);
3255
3256 if (!err) {
3257 flags &= ~BRIDGE_FLAGS_SELF;
3258
3259 /* Generate event to notify upper layer of bridge
3260 * change
3261 */
3262 err = rtnl_bridge_notify(dev);
3263 }
3264 }
3265
3266 if (have_flags)
3267 memcpy(nla_data(attr), &flags, sizeof(flags));
3268 out:
3269 return err;
3270 }
3271
3272 /* Process one rtnetlink message. */
3273
3274 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3275 {
3276 struct net *net = sock_net(skb->sk);
3277 rtnl_doit_func doit;
3278 int sz_idx, kind;
3279 int family;
3280 int type;
3281 int err;
3282
3283 type = nlh->nlmsg_type;
3284 if (type > RTM_MAX)
3285 return -EOPNOTSUPP;
3286
3287 type -= RTM_BASE;
3288
3289 /* All the messages must have at least 1 byte length */
3290 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3291 return 0;
3292
3293 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3294 sz_idx = type>>2;
3295 kind = type&3;
3296
3297 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3298 return -EPERM;
3299
3300 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3301 struct sock *rtnl;
3302 rtnl_dumpit_func dumpit;
3303 rtnl_calcit_func calcit;
3304 u16 min_dump_alloc = 0;
3305
3306 dumpit = rtnl_get_dumpit(family, type);
3307 if (dumpit == NULL)
3308 return -EOPNOTSUPP;
3309 calcit = rtnl_get_calcit(family, type);
3310 if (calcit)
3311 min_dump_alloc = calcit(skb, nlh);
3312
3313 __rtnl_unlock();
3314 rtnl = net->rtnl;
3315 {
3316 struct netlink_dump_control c = {
3317 .dump = dumpit,
3318 .min_dump_alloc = min_dump_alloc,
3319 };
3320 err = netlink_dump_start(rtnl, skb, nlh, &c);
3321 }
3322 rtnl_lock();
3323 return err;
3324 }
3325
3326 doit = rtnl_get_doit(family, type);
3327 if (doit == NULL)
3328 return -EOPNOTSUPP;
3329
3330 return doit(skb, nlh);
3331 }
3332
3333 static void rtnetlink_rcv(struct sk_buff *skb)
3334 {
3335 rtnl_lock();
3336 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3337 rtnl_unlock();
3338 }
3339
3340 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3341 {
3342 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3343
3344 switch (event) {
3345 case NETDEV_UP:
3346 case NETDEV_DOWN:
3347 case NETDEV_PRE_UP:
3348 case NETDEV_POST_INIT:
3349 case NETDEV_REGISTER:
3350 case NETDEV_CHANGE:
3351 case NETDEV_PRE_TYPE_CHANGE:
3352 case NETDEV_GOING_DOWN:
3353 case NETDEV_UNREGISTER:
3354 case NETDEV_UNREGISTER_FINAL:
3355 case NETDEV_RELEASE:
3356 case NETDEV_JOIN:
3357 case NETDEV_BONDING_INFO:
3358 break;
3359 default:
3360 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3361 break;
3362 }
3363 return NOTIFY_DONE;
3364 }
3365
3366 static struct notifier_block rtnetlink_dev_notifier = {
3367 .notifier_call = rtnetlink_event,
3368 };
3369
3370
3371 static int __net_init rtnetlink_net_init(struct net *net)
3372 {
3373 struct sock *sk;
3374 struct netlink_kernel_cfg cfg = {
3375 .groups = RTNLGRP_MAX,
3376 .input = rtnetlink_rcv,
3377 .cb_mutex = &rtnl_mutex,
3378 .flags = NL_CFG_F_NONROOT_RECV,
3379 };
3380
3381 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3382 if (!sk)
3383 return -ENOMEM;
3384 net->rtnl = sk;
3385 return 0;
3386 }
3387
3388 static void __net_exit rtnetlink_net_exit(struct net *net)
3389 {
3390 netlink_kernel_release(net->rtnl);
3391 net->rtnl = NULL;
3392 }
3393
3394 static struct pernet_operations rtnetlink_net_ops = {
3395 .init = rtnetlink_net_init,
3396 .exit = rtnetlink_net_exit,
3397 };
3398
3399 void __init rtnetlink_init(void)
3400 {
3401 if (register_pernet_subsys(&rtnetlink_net_ops))
3402 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3403
3404 register_netdevice_notifier(&rtnetlink_dev_notifier);
3405
3406 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3407 rtnl_dump_ifinfo, rtnl_calcit);
3408 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3409 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3410 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3411
3412 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3413 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3414
3415 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3416 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3417 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3418
3419 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3420 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3421 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3422 }
3423
Linux kernel - Deliverables
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