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