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Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
[deliverable/linux.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/if_bridge.h>
39 #include <linux/if_vlan.h>
40 #include <linux/pci.h>
41 #include <linux/etherdevice.h>
42
43 #include <asm/uaccess.h>
44
45 #include <linux/inet.h>
46 #include <linux/netdevice.h>
47 #include <net/switchdev.h>
48 #include <net/ip.h>
49 #include <net/protocol.h>
50 #include <net/arp.h>
51 #include <net/route.h>
52 #include <net/udp.h>
53 #include <net/tcp.h>
54 #include <net/sock.h>
55 #include <net/pkt_sched.h>
56 #include <net/fib_rules.h>
57 #include <net/rtnetlink.h>
58 #include <net/net_namespace.h>
59
60 struct rtnl_link {
61 rtnl_doit_func doit;
62 rtnl_dumpit_func dumpit;
63 rtnl_calcit_func calcit;
64 };
65
66 static DEFINE_MUTEX(rtnl_mutex);
67
68 void rtnl_lock(void)
69 {
70 mutex_lock(&rtnl_mutex);
71 }
72 EXPORT_SYMBOL(rtnl_lock);
73
74 void __rtnl_unlock(void)
75 {
76 mutex_unlock(&rtnl_mutex);
77 }
78
79 void rtnl_unlock(void)
80 {
81 /* This fellow will unlock it for us. */
82 netdev_run_todo();
83 }
84 EXPORT_SYMBOL(rtnl_unlock);
85
86 int rtnl_trylock(void)
87 {
88 return mutex_trylock(&rtnl_mutex);
89 }
90 EXPORT_SYMBOL(rtnl_trylock);
91
92 int rtnl_is_locked(void)
93 {
94 return mutex_is_locked(&rtnl_mutex);
95 }
96 EXPORT_SYMBOL(rtnl_is_locked);
97
98 #ifdef CONFIG_PROVE_LOCKING
99 bool lockdep_rtnl_is_held(void)
100 {
101 return lockdep_is_held(&rtnl_mutex);
102 }
103 EXPORT_SYMBOL(lockdep_rtnl_is_held);
104 #endif /* #ifdef CONFIG_PROVE_LOCKING */
105
106 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
107
108 static inline int rtm_msgindex(int msgtype)
109 {
110 int msgindex = msgtype - RTM_BASE;
111
112 /*
113 * msgindex < 0 implies someone tried to register a netlink
114 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
115 * the message type has not been added to linux/rtnetlink.h
116 */
117 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
118
119 return msgindex;
120 }
121
122 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
123 {
124 struct rtnl_link *tab;
125
126 if (protocol <= RTNL_FAMILY_MAX)
127 tab = rtnl_msg_handlers[protocol];
128 else
129 tab = NULL;
130
131 if (tab == NULL || tab[msgindex].doit == NULL)
132 tab = rtnl_msg_handlers[PF_UNSPEC];
133
134 return tab[msgindex].doit;
135 }
136
137 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
138 {
139 struct rtnl_link *tab;
140
141 if (protocol <= RTNL_FAMILY_MAX)
142 tab = rtnl_msg_handlers[protocol];
143 else
144 tab = NULL;
145
146 if (tab == NULL || tab[msgindex].dumpit == NULL)
147 tab = rtnl_msg_handlers[PF_UNSPEC];
148
149 return tab[msgindex].dumpit;
150 }
151
152 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
153 {
154 struct rtnl_link *tab;
155
156 if (protocol <= RTNL_FAMILY_MAX)
157 tab = rtnl_msg_handlers[protocol];
158 else
159 tab = NULL;
160
161 if (tab == NULL || tab[msgindex].calcit == NULL)
162 tab = rtnl_msg_handlers[PF_UNSPEC];
163
164 return tab[msgindex].calcit;
165 }
166
167 /**
168 * __rtnl_register - Register a rtnetlink message type
169 * @protocol: Protocol family or PF_UNSPEC
170 * @msgtype: rtnetlink message type
171 * @doit: Function pointer called for each request message
172 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
173 * @calcit: Function pointer to calc size of dump message
174 *
175 * Registers the specified function pointers (at least one of them has
176 * to be non-NULL) to be called whenever a request message for the
177 * specified protocol family and message type is received.
178 *
179 * The special protocol family PF_UNSPEC may be used to define fallback
180 * function pointers for the case when no entry for the specific protocol
181 * family exists.
182 *
183 * Returns 0 on success or a negative error code.
184 */
185 int __rtnl_register(int protocol, int msgtype,
186 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
187 rtnl_calcit_func calcit)
188 {
189 struct rtnl_link *tab;
190 int msgindex;
191
192 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
193 msgindex = rtm_msgindex(msgtype);
194
195 tab = rtnl_msg_handlers[protocol];
196 if (tab == NULL) {
197 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
198 if (tab == NULL)
199 return -ENOBUFS;
200
201 rtnl_msg_handlers[protocol] = tab;
202 }
203
204 if (doit)
205 tab[msgindex].doit = doit;
206
207 if (dumpit)
208 tab[msgindex].dumpit = dumpit;
209
210 if (calcit)
211 tab[msgindex].calcit = calcit;
212
213 return 0;
214 }
215 EXPORT_SYMBOL_GPL(__rtnl_register);
216
217 /**
218 * rtnl_register - Register a rtnetlink message type
219 *
220 * Identical to __rtnl_register() but panics on failure. This is useful
221 * as failure of this function is very unlikely, it can only happen due
222 * to lack of memory when allocating the chain to store all message
223 * handlers for a protocol. Meant for use in init functions where lack
224 * of memory implies no sense in continuing.
225 */
226 void rtnl_register(int protocol, int msgtype,
227 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
228 rtnl_calcit_func calcit)
229 {
230 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
231 panic("Unable to register rtnetlink message handler, "
232 "protocol = %d, message type = %d\n",
233 protocol, msgtype);
234 }
235 EXPORT_SYMBOL_GPL(rtnl_register);
236
237 /**
238 * rtnl_unregister - Unregister a rtnetlink message type
239 * @protocol: Protocol family or PF_UNSPEC
240 * @msgtype: rtnetlink message type
241 *
242 * Returns 0 on success or a negative error code.
243 */
244 int rtnl_unregister(int protocol, int msgtype)
245 {
246 int msgindex;
247
248 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
249 msgindex = rtm_msgindex(msgtype);
250
251 if (rtnl_msg_handlers[protocol] == NULL)
252 return -ENOENT;
253
254 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
255 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
256
257 return 0;
258 }
259 EXPORT_SYMBOL_GPL(rtnl_unregister);
260
261 /**
262 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
263 * @protocol : Protocol family or PF_UNSPEC
264 *
265 * Identical to calling rtnl_unregster() for all registered message types
266 * of a certain protocol family.
267 */
268 void rtnl_unregister_all(int protocol)
269 {
270 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
271
272 kfree(rtnl_msg_handlers[protocol]);
273 rtnl_msg_handlers[protocol] = NULL;
274 }
275 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
276
277 static LIST_HEAD(link_ops);
278
279 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
280 {
281 const struct rtnl_link_ops *ops;
282
283 list_for_each_entry(ops, &link_ops, list) {
284 if (!strcmp(ops->kind, kind))
285 return ops;
286 }
287 return NULL;
288 }
289
290 /**
291 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
292 * @ops: struct rtnl_link_ops * to register
293 *
294 * The caller must hold the rtnl_mutex. This function should be used
295 * by drivers that create devices during module initialization. It
296 * must be called before registering the devices.
297 *
298 * Returns 0 on success or a negative error code.
299 */
300 int __rtnl_link_register(struct rtnl_link_ops *ops)
301 {
302 if (rtnl_link_ops_get(ops->kind))
303 return -EEXIST;
304
305 /* The check for setup is here because if ops
306 * does not have that filled up, it is not possible
307 * to use the ops for creating device. So do not
308 * fill up dellink as well. That disables rtnl_dellink.
309 */
310 if (ops->setup && !ops->dellink)
311 ops->dellink = unregister_netdevice_queue;
312
313 list_add_tail(&ops->list, &link_ops);
314 return 0;
315 }
316 EXPORT_SYMBOL_GPL(__rtnl_link_register);
317
318 /**
319 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
320 * @ops: struct rtnl_link_ops * to register
321 *
322 * Returns 0 on success or a negative error code.
323 */
324 int rtnl_link_register(struct rtnl_link_ops *ops)
325 {
326 int err;
327
328 rtnl_lock();
329 err = __rtnl_link_register(ops);
330 rtnl_unlock();
331 return err;
332 }
333 EXPORT_SYMBOL_GPL(rtnl_link_register);
334
335 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
336 {
337 struct net_device *dev;
338 LIST_HEAD(list_kill);
339
340 for_each_netdev(net, dev) {
341 if (dev->rtnl_link_ops == ops)
342 ops->dellink(dev, &list_kill);
343 }
344 unregister_netdevice_many(&list_kill);
345 }
346
347 /**
348 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
349 * @ops: struct rtnl_link_ops * to unregister
350 *
351 * The caller must hold the rtnl_mutex.
352 */
353 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
354 {
355 struct net *net;
356
357 for_each_net(net) {
358 __rtnl_kill_links(net, ops);
359 }
360 list_del(&ops->list);
361 }
362 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
363
364 /* Return with the rtnl_lock held when there are no network
365 * devices unregistering in any network namespace.
366 */
367 static void rtnl_lock_unregistering_all(void)
368 {
369 struct net *net;
370 bool unregistering;
371 DEFINE_WAIT_FUNC(wait, woken_wake_function);
372
373 add_wait_queue(&netdev_unregistering_wq, &wait);
374 for (;;) {
375 unregistering = false;
376 rtnl_lock();
377 for_each_net(net) {
378 if (net->dev_unreg_count > 0) {
379 unregistering = true;
380 break;
381 }
382 }
383 if (!unregistering)
384 break;
385 __rtnl_unlock();
386
387 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
388 }
389 remove_wait_queue(&netdev_unregistering_wq, &wait);
390 }
391
392 /**
393 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
394 * @ops: struct rtnl_link_ops * to unregister
395 */
396 void rtnl_link_unregister(struct rtnl_link_ops *ops)
397 {
398 /* Close the race with cleanup_net() */
399 mutex_lock(&net_mutex);
400 rtnl_lock_unregistering_all();
401 __rtnl_link_unregister(ops);
402 rtnl_unlock();
403 mutex_unlock(&net_mutex);
404 }
405 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
406
407 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
408 {
409 struct net_device *master_dev;
410 const struct rtnl_link_ops *ops;
411
412 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
413 if (!master_dev)
414 return 0;
415 ops = master_dev->rtnl_link_ops;
416 if (!ops || !ops->get_slave_size)
417 return 0;
418 /* IFLA_INFO_SLAVE_DATA + nested data */
419 return nla_total_size(sizeof(struct nlattr)) +
420 ops->get_slave_size(master_dev, dev);
421 }
422
423 static size_t rtnl_link_get_size(const struct net_device *dev)
424 {
425 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
426 size_t size;
427
428 if (!ops)
429 return 0;
430
431 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
432 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
433
434 if (ops->get_size)
435 /* IFLA_INFO_DATA + nested data */
436 size += nla_total_size(sizeof(struct nlattr)) +
437 ops->get_size(dev);
438
439 if (ops->get_xstats_size)
440 /* IFLA_INFO_XSTATS */
441 size += nla_total_size(ops->get_xstats_size(dev));
442
443 size += rtnl_link_get_slave_info_data_size(dev);
444
445 return size;
446 }
447
448 static LIST_HEAD(rtnl_af_ops);
449
450 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
451 {
452 const struct rtnl_af_ops *ops;
453
454 list_for_each_entry(ops, &rtnl_af_ops, list) {
455 if (ops->family == family)
456 return ops;
457 }
458
459 return NULL;
460 }
461
462 /**
463 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
464 * @ops: struct rtnl_af_ops * to register
465 *
466 * Returns 0 on success or a negative error code.
467 */
468 void rtnl_af_register(struct rtnl_af_ops *ops)
469 {
470 rtnl_lock();
471 list_add_tail(&ops->list, &rtnl_af_ops);
472 rtnl_unlock();
473 }
474 EXPORT_SYMBOL_GPL(rtnl_af_register);
475
476 /**
477 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
478 * @ops: struct rtnl_af_ops * to unregister
479 *
480 * The caller must hold the rtnl_mutex.
481 */
482 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
483 {
484 list_del(&ops->list);
485 }
486 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
487
488 /**
489 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
490 * @ops: struct rtnl_af_ops * to unregister
491 */
492 void rtnl_af_unregister(struct rtnl_af_ops *ops)
493 {
494 rtnl_lock();
495 __rtnl_af_unregister(ops);
496 rtnl_unlock();
497 }
498 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
499
500 static size_t rtnl_link_get_af_size(const struct net_device *dev,
501 u32 ext_filter_mask)
502 {
503 struct rtnl_af_ops *af_ops;
504 size_t size;
505
506 /* IFLA_AF_SPEC */
507 size = nla_total_size(sizeof(struct nlattr));
508
509 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
510 if (af_ops->get_link_af_size) {
511 /* AF_* + nested data */
512 size += nla_total_size(sizeof(struct nlattr)) +
513 af_ops->get_link_af_size(dev, ext_filter_mask);
514 }
515 }
516
517 return size;
518 }
519
520 static bool rtnl_have_link_slave_info(const struct net_device *dev)
521 {
522 struct net_device *master_dev;
523
524 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
525 if (master_dev && master_dev->rtnl_link_ops)
526 return true;
527 return false;
528 }
529
530 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
531 const struct net_device *dev)
532 {
533 struct net_device *master_dev;
534 const struct rtnl_link_ops *ops;
535 struct nlattr *slave_data;
536 int err;
537
538 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
539 if (!master_dev)
540 return 0;
541 ops = master_dev->rtnl_link_ops;
542 if (!ops)
543 return 0;
544 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
545 return -EMSGSIZE;
546 if (ops->fill_slave_info) {
547 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
548 if (!slave_data)
549 return -EMSGSIZE;
550 err = ops->fill_slave_info(skb, master_dev, dev);
551 if (err < 0)
552 goto err_cancel_slave_data;
553 nla_nest_end(skb, slave_data);
554 }
555 return 0;
556
557 err_cancel_slave_data:
558 nla_nest_cancel(skb, slave_data);
559 return err;
560 }
561
562 static int rtnl_link_info_fill(struct sk_buff *skb,
563 const struct net_device *dev)
564 {
565 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
566 struct nlattr *data;
567 int err;
568
569 if (!ops)
570 return 0;
571 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
572 return -EMSGSIZE;
573 if (ops->fill_xstats) {
574 err = ops->fill_xstats(skb, dev);
575 if (err < 0)
576 return err;
577 }
578 if (ops->fill_info) {
579 data = nla_nest_start(skb, IFLA_INFO_DATA);
580 if (data == NULL)
581 return -EMSGSIZE;
582 err = ops->fill_info(skb, dev);
583 if (err < 0)
584 goto err_cancel_data;
585 nla_nest_end(skb, data);
586 }
587 return 0;
588
589 err_cancel_data:
590 nla_nest_cancel(skb, data);
591 return err;
592 }
593
594 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
595 {
596 struct nlattr *linkinfo;
597 int err = -EMSGSIZE;
598
599 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
600 if (linkinfo == NULL)
601 goto out;
602
603 err = rtnl_link_info_fill(skb, dev);
604 if (err < 0)
605 goto err_cancel_link;
606
607 err = rtnl_link_slave_info_fill(skb, dev);
608 if (err < 0)
609 goto err_cancel_link;
610
611 nla_nest_end(skb, linkinfo);
612 return 0;
613
614 err_cancel_link:
615 nla_nest_cancel(skb, linkinfo);
616 out:
617 return err;
618 }
619
620 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
621 {
622 struct sock *rtnl = net->rtnl;
623 int err = 0;
624
625 NETLINK_CB(skb).dst_group = group;
626 if (echo)
627 atomic_inc(&skb->users);
628 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
629 if (echo)
630 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
631 return err;
632 }
633
634 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
635 {
636 struct sock *rtnl = net->rtnl;
637
638 return nlmsg_unicast(rtnl, skb, pid);
639 }
640 EXPORT_SYMBOL(rtnl_unicast);
641
642 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
643 struct nlmsghdr *nlh, gfp_t flags)
644 {
645 struct sock *rtnl = net->rtnl;
646 int report = 0;
647
648 if (nlh)
649 report = nlmsg_report(nlh);
650
651 nlmsg_notify(rtnl, skb, pid, group, report, flags);
652 }
653 EXPORT_SYMBOL(rtnl_notify);
654
655 void rtnl_set_sk_err(struct net *net, u32 group, int error)
656 {
657 struct sock *rtnl = net->rtnl;
658
659 netlink_set_err(rtnl, 0, group, error);
660 }
661 EXPORT_SYMBOL(rtnl_set_sk_err);
662
663 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
664 {
665 struct nlattr *mx;
666 int i, valid = 0;
667
668 mx = nla_nest_start(skb, RTA_METRICS);
669 if (mx == NULL)
670 return -ENOBUFS;
671
672 for (i = 0; i < RTAX_MAX; i++) {
673 if (metrics[i]) {
674 if (i == RTAX_CC_ALGO - 1) {
675 char tmp[TCP_CA_NAME_MAX], *name;
676
677 name = tcp_ca_get_name_by_key(metrics[i], tmp);
678 if (!name)
679 continue;
680 if (nla_put_string(skb, i + 1, name))
681 goto nla_put_failure;
682 } else if (i == RTAX_FEATURES - 1) {
683 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
684
685 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
686 if (nla_put_u32(skb, i + 1, user_features))
687 goto nla_put_failure;
688 } else {
689 if (nla_put_u32(skb, i + 1, metrics[i]))
690 goto nla_put_failure;
691 }
692 valid++;
693 }
694 }
695
696 if (!valid) {
697 nla_nest_cancel(skb, mx);
698 return 0;
699 }
700
701 return nla_nest_end(skb, mx);
702
703 nla_put_failure:
704 nla_nest_cancel(skb, mx);
705 return -EMSGSIZE;
706 }
707 EXPORT_SYMBOL(rtnetlink_put_metrics);
708
709 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
710 long expires, u32 error)
711 {
712 struct rta_cacheinfo ci = {
713 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
714 .rta_used = dst->__use,
715 .rta_clntref = atomic_read(&(dst->__refcnt)),
716 .rta_error = error,
717 .rta_id = id,
718 };
719
720 if (expires) {
721 unsigned long clock;
722
723 clock = jiffies_to_clock_t(abs(expires));
724 clock = min_t(unsigned long, clock, INT_MAX);
725 ci.rta_expires = (expires > 0) ? clock : -clock;
726 }
727 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
728 }
729 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
730
731 static void set_operstate(struct net_device *dev, unsigned char transition)
732 {
733 unsigned char operstate = dev->operstate;
734
735 switch (transition) {
736 case IF_OPER_UP:
737 if ((operstate == IF_OPER_DORMANT ||
738 operstate == IF_OPER_UNKNOWN) &&
739 !netif_dormant(dev))
740 operstate = IF_OPER_UP;
741 break;
742
743 case IF_OPER_DORMANT:
744 if (operstate == IF_OPER_UP ||
745 operstate == IF_OPER_UNKNOWN)
746 operstate = IF_OPER_DORMANT;
747 break;
748 }
749
750 if (dev->operstate != operstate) {
751 write_lock_bh(&dev_base_lock);
752 dev->operstate = operstate;
753 write_unlock_bh(&dev_base_lock);
754 netdev_state_change(dev);
755 }
756 }
757
758 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
759 {
760 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
761 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
762 }
763
764 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
765 const struct ifinfomsg *ifm)
766 {
767 unsigned int flags = ifm->ifi_flags;
768
769 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
770 if (ifm->ifi_change)
771 flags = (flags & ifm->ifi_change) |
772 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
773
774 return flags;
775 }
776
777 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
778 const struct rtnl_link_stats64 *b)
779 {
780 a->rx_packets = b->rx_packets;
781 a->tx_packets = b->tx_packets;
782 a->rx_bytes = b->rx_bytes;
783 a->tx_bytes = b->tx_bytes;
784 a->rx_errors = b->rx_errors;
785 a->tx_errors = b->tx_errors;
786 a->rx_dropped = b->rx_dropped;
787 a->tx_dropped = b->tx_dropped;
788
789 a->multicast = b->multicast;
790 a->collisions = b->collisions;
791
792 a->rx_length_errors = b->rx_length_errors;
793 a->rx_over_errors = b->rx_over_errors;
794 a->rx_crc_errors = b->rx_crc_errors;
795 a->rx_frame_errors = b->rx_frame_errors;
796 a->rx_fifo_errors = b->rx_fifo_errors;
797 a->rx_missed_errors = b->rx_missed_errors;
798
799 a->tx_aborted_errors = b->tx_aborted_errors;
800 a->tx_carrier_errors = b->tx_carrier_errors;
801 a->tx_fifo_errors = b->tx_fifo_errors;
802 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
803 a->tx_window_errors = b->tx_window_errors;
804
805 a->rx_compressed = b->rx_compressed;
806 a->tx_compressed = b->tx_compressed;
807 }
808
809 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
810 {
811 memcpy(v, b, sizeof(*b));
812 }
813
814 /* All VF info */
815 static inline int rtnl_vfinfo_size(const struct net_device *dev,
816 u32 ext_filter_mask)
817 {
818 if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
819 (ext_filter_mask & RTEXT_FILTER_VF)) {
820 int num_vfs = dev_num_vf(dev->dev.parent);
821 size_t size = nla_total_size(sizeof(struct nlattr));
822 size += nla_total_size(num_vfs * sizeof(struct nlattr));
823 size += num_vfs *
824 (nla_total_size(sizeof(struct ifla_vf_mac)) +
825 nla_total_size(sizeof(struct ifla_vf_vlan)) +
826 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
827 nla_total_size(sizeof(struct ifla_vf_rate)) +
828 nla_total_size(sizeof(struct ifla_vf_link_state)) +
829 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
830 /* IFLA_VF_STATS_RX_PACKETS */
831 nla_total_size(sizeof(__u64)) +
832 /* IFLA_VF_STATS_TX_PACKETS */
833 nla_total_size(sizeof(__u64)) +
834 /* IFLA_VF_STATS_RX_BYTES */
835 nla_total_size(sizeof(__u64)) +
836 /* IFLA_VF_STATS_TX_BYTES */
837 nla_total_size(sizeof(__u64)) +
838 /* IFLA_VF_STATS_BROADCAST */
839 nla_total_size(sizeof(__u64)) +
840 /* IFLA_VF_STATS_MULTICAST */
841 nla_total_size(sizeof(__u64)) +
842 nla_total_size(sizeof(struct ifla_vf_trust)));
843 return size;
844 } else
845 return 0;
846 }
847
848 static size_t rtnl_port_size(const struct net_device *dev,
849 u32 ext_filter_mask)
850 {
851 size_t port_size = nla_total_size(4) /* PORT_VF */
852 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
853 + nla_total_size(sizeof(struct ifla_port_vsi))
854 /* PORT_VSI_TYPE */
855 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
856 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
857 + nla_total_size(1) /* PROT_VDP_REQUEST */
858 + nla_total_size(2); /* PORT_VDP_RESPONSE */
859 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
860 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
861 + port_size;
862 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
863 + port_size;
864
865 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
866 !(ext_filter_mask & RTEXT_FILTER_VF))
867 return 0;
868 if (dev_num_vf(dev->dev.parent))
869 return port_self_size + vf_ports_size +
870 vf_port_size * dev_num_vf(dev->dev.parent);
871 else
872 return port_self_size;
873 }
874
875 static noinline size_t if_nlmsg_size(const struct net_device *dev,
876 u32 ext_filter_mask)
877 {
878 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
879 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
880 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
881 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
882 + nla_total_size(sizeof(struct rtnl_link_ifmap))
883 + nla_total_size(sizeof(struct rtnl_link_stats))
884 + nla_total_size(sizeof(struct rtnl_link_stats64))
885 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
886 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
887 + nla_total_size(4) /* IFLA_TXQLEN */
888 + nla_total_size(4) /* IFLA_WEIGHT */
889 + nla_total_size(4) /* IFLA_MTU */
890 + nla_total_size(4) /* IFLA_LINK */
891 + nla_total_size(4) /* IFLA_MASTER */
892 + nla_total_size(1) /* IFLA_CARRIER */
893 + nla_total_size(4) /* IFLA_PROMISCUITY */
894 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
895 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
896 + nla_total_size(1) /* IFLA_OPERSTATE */
897 + nla_total_size(1) /* IFLA_LINKMODE */
898 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
899 + nla_total_size(4) /* IFLA_LINK_NETNSID */
900 + nla_total_size(ext_filter_mask
901 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
902 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
903 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
904 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
905 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
906 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
907 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
908 + nla_total_size(1); /* IFLA_PROTO_DOWN */
909
910 }
911
912 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
913 {
914 struct nlattr *vf_ports;
915 struct nlattr *vf_port;
916 int vf;
917 int err;
918
919 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
920 if (!vf_ports)
921 return -EMSGSIZE;
922
923 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
924 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
925 if (!vf_port)
926 goto nla_put_failure;
927 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
928 goto nla_put_failure;
929 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
930 if (err == -EMSGSIZE)
931 goto nla_put_failure;
932 if (err) {
933 nla_nest_cancel(skb, vf_port);
934 continue;
935 }
936 nla_nest_end(skb, vf_port);
937 }
938
939 nla_nest_end(skb, vf_ports);
940
941 return 0;
942
943 nla_put_failure:
944 nla_nest_cancel(skb, vf_ports);
945 return -EMSGSIZE;
946 }
947
948 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
949 {
950 struct nlattr *port_self;
951 int err;
952
953 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
954 if (!port_self)
955 return -EMSGSIZE;
956
957 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
958 if (err) {
959 nla_nest_cancel(skb, port_self);
960 return (err == -EMSGSIZE) ? err : 0;
961 }
962
963 nla_nest_end(skb, port_self);
964
965 return 0;
966 }
967
968 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
969 u32 ext_filter_mask)
970 {
971 int err;
972
973 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
974 !(ext_filter_mask & RTEXT_FILTER_VF))
975 return 0;
976
977 err = rtnl_port_self_fill(skb, dev);
978 if (err)
979 return err;
980
981 if (dev_num_vf(dev->dev.parent)) {
982 err = rtnl_vf_ports_fill(skb, dev);
983 if (err)
984 return err;
985 }
986
987 return 0;
988 }
989
990 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
991 {
992 int err;
993 struct netdev_phys_item_id ppid;
994
995 err = dev_get_phys_port_id(dev, &ppid);
996 if (err) {
997 if (err == -EOPNOTSUPP)
998 return 0;
999 return err;
1000 }
1001
1002 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1003 return -EMSGSIZE;
1004
1005 return 0;
1006 }
1007
1008 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1009 {
1010 char name[IFNAMSIZ];
1011 int err;
1012
1013 err = dev_get_phys_port_name(dev, name, sizeof(name));
1014 if (err) {
1015 if (err == -EOPNOTSUPP)
1016 return 0;
1017 return err;
1018 }
1019
1020 if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
1021 return -EMSGSIZE;
1022
1023 return 0;
1024 }
1025
1026 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1027 {
1028 int err;
1029 struct switchdev_attr attr = {
1030 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1031 .flags = SWITCHDEV_F_NO_RECURSE,
1032 };
1033
1034 err = switchdev_port_attr_get(dev, &attr);
1035 if (err) {
1036 if (err == -EOPNOTSUPP)
1037 return 0;
1038 return err;
1039 }
1040
1041 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1042 attr.u.ppid.id))
1043 return -EMSGSIZE;
1044
1045 return 0;
1046 }
1047
1048 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1049 int type, u32 pid, u32 seq, u32 change,
1050 unsigned int flags, u32 ext_filter_mask)
1051 {
1052 struct ifinfomsg *ifm;
1053 struct nlmsghdr *nlh;
1054 struct rtnl_link_stats64 temp;
1055 const struct rtnl_link_stats64 *stats;
1056 struct nlattr *attr, *af_spec;
1057 struct rtnl_af_ops *af_ops;
1058 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1059
1060 ASSERT_RTNL();
1061 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1062 if (nlh == NULL)
1063 return -EMSGSIZE;
1064
1065 ifm = nlmsg_data(nlh);
1066 ifm->ifi_family = AF_UNSPEC;
1067 ifm->__ifi_pad = 0;
1068 ifm->ifi_type = dev->type;
1069 ifm->ifi_index = dev->ifindex;
1070 ifm->ifi_flags = dev_get_flags(dev);
1071 ifm->ifi_change = change;
1072
1073 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1074 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1075 nla_put_u8(skb, IFLA_OPERSTATE,
1076 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1077 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1078 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1079 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1080 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1081 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1082 #ifdef CONFIG_RPS
1083 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1084 #endif
1085 (dev->ifindex != dev_get_iflink(dev) &&
1086 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1087 (upper_dev &&
1088 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1089 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1090 (dev->qdisc &&
1091 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1092 (dev->ifalias &&
1093 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1094 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1095 atomic_read(&dev->carrier_changes)) ||
1096 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1097 goto nla_put_failure;
1098
1099 if (1) {
1100 struct rtnl_link_ifmap map = {
1101 .mem_start = dev->mem_start,
1102 .mem_end = dev->mem_end,
1103 .base_addr = dev->base_addr,
1104 .irq = dev->irq,
1105 .dma = dev->dma,
1106 .port = dev->if_port,
1107 };
1108 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1109 goto nla_put_failure;
1110 }
1111
1112 if (dev->addr_len) {
1113 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1114 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1115 goto nla_put_failure;
1116 }
1117
1118 if (rtnl_phys_port_id_fill(skb, dev))
1119 goto nla_put_failure;
1120
1121 if (rtnl_phys_port_name_fill(skb, dev))
1122 goto nla_put_failure;
1123
1124 if (rtnl_phys_switch_id_fill(skb, dev))
1125 goto nla_put_failure;
1126
1127 attr = nla_reserve(skb, IFLA_STATS,
1128 sizeof(struct rtnl_link_stats));
1129 if (attr == NULL)
1130 goto nla_put_failure;
1131
1132 stats = dev_get_stats(dev, &temp);
1133 copy_rtnl_link_stats(nla_data(attr), stats);
1134
1135 attr = nla_reserve(skb, IFLA_STATS64,
1136 sizeof(struct rtnl_link_stats64));
1137 if (attr == NULL)
1138 goto nla_put_failure;
1139 copy_rtnl_link_stats64(nla_data(attr), stats);
1140
1141 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1142 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1143 goto nla_put_failure;
1144
1145 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1146 && (ext_filter_mask & RTEXT_FILTER_VF)) {
1147 int i;
1148
1149 struct nlattr *vfinfo, *vf, *vfstats;
1150 int num_vfs = dev_num_vf(dev->dev.parent);
1151
1152 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1153 if (!vfinfo)
1154 goto nla_put_failure;
1155 for (i = 0; i < num_vfs; i++) {
1156 struct ifla_vf_info ivi;
1157 struct ifla_vf_mac vf_mac;
1158 struct ifla_vf_vlan vf_vlan;
1159 struct ifla_vf_rate vf_rate;
1160 struct ifla_vf_tx_rate vf_tx_rate;
1161 struct ifla_vf_spoofchk vf_spoofchk;
1162 struct ifla_vf_link_state vf_linkstate;
1163 struct ifla_vf_rss_query_en vf_rss_query_en;
1164 struct ifla_vf_stats vf_stats;
1165 struct ifla_vf_trust vf_trust;
1166
1167 /*
1168 * Not all SR-IOV capable drivers support the
1169 * spoofcheck and "RSS query enable" query. Preset to
1170 * -1 so the user space tool can detect that the driver
1171 * didn't report anything.
1172 */
1173 ivi.spoofchk = -1;
1174 ivi.rss_query_en = -1;
1175 ivi.trusted = -1;
1176 memset(ivi.mac, 0, sizeof(ivi.mac));
1177 /* The default value for VF link state is "auto"
1178 * IFLA_VF_LINK_STATE_AUTO which equals zero
1179 */
1180 ivi.linkstate = 0;
1181 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1182 break;
1183 vf_mac.vf =
1184 vf_vlan.vf =
1185 vf_rate.vf =
1186 vf_tx_rate.vf =
1187 vf_spoofchk.vf =
1188 vf_linkstate.vf =
1189 vf_rss_query_en.vf =
1190 vf_trust.vf = ivi.vf;
1191
1192 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1193 vf_vlan.vlan = ivi.vlan;
1194 vf_vlan.qos = ivi.qos;
1195 vf_tx_rate.rate = ivi.max_tx_rate;
1196 vf_rate.min_tx_rate = ivi.min_tx_rate;
1197 vf_rate.max_tx_rate = ivi.max_tx_rate;
1198 vf_spoofchk.setting = ivi.spoofchk;
1199 vf_linkstate.link_state = ivi.linkstate;
1200 vf_rss_query_en.setting = ivi.rss_query_en;
1201 vf_trust.setting = ivi.trusted;
1202 vf = nla_nest_start(skb, IFLA_VF_INFO);
1203 if (!vf) {
1204 nla_nest_cancel(skb, vfinfo);
1205 goto nla_put_failure;
1206 }
1207 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1208 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1209 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1210 &vf_rate) ||
1211 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1212 &vf_tx_rate) ||
1213 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1214 &vf_spoofchk) ||
1215 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1216 &vf_linkstate) ||
1217 nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1218 sizeof(vf_rss_query_en),
1219 &vf_rss_query_en) ||
1220 nla_put(skb, IFLA_VF_TRUST,
1221 sizeof(vf_trust), &vf_trust))
1222 goto nla_put_failure;
1223 memset(&vf_stats, 0, sizeof(vf_stats));
1224 if (dev->netdev_ops->ndo_get_vf_stats)
1225 dev->netdev_ops->ndo_get_vf_stats(dev, i,
1226 &vf_stats);
1227 vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1228 if (!vfstats) {
1229 nla_nest_cancel(skb, vf);
1230 nla_nest_cancel(skb, vfinfo);
1231 goto nla_put_failure;
1232 }
1233 if (nla_put_u64(skb, IFLA_VF_STATS_RX_PACKETS,
1234 vf_stats.rx_packets) ||
1235 nla_put_u64(skb, IFLA_VF_STATS_TX_PACKETS,
1236 vf_stats.tx_packets) ||
1237 nla_put_u64(skb, IFLA_VF_STATS_RX_BYTES,
1238 vf_stats.rx_bytes) ||
1239 nla_put_u64(skb, IFLA_VF_STATS_TX_BYTES,
1240 vf_stats.tx_bytes) ||
1241 nla_put_u64(skb, IFLA_VF_STATS_BROADCAST,
1242 vf_stats.broadcast) ||
1243 nla_put_u64(skb, IFLA_VF_STATS_MULTICAST,
1244 vf_stats.multicast))
1245 goto nla_put_failure;
1246 nla_nest_end(skb, vfstats);
1247 nla_nest_end(skb, vf);
1248 }
1249 nla_nest_end(skb, vfinfo);
1250 }
1251
1252 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1253 goto nla_put_failure;
1254
1255 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1256 if (rtnl_link_fill(skb, dev) < 0)
1257 goto nla_put_failure;
1258 }
1259
1260 if (dev->rtnl_link_ops &&
1261 dev->rtnl_link_ops->get_link_net) {
1262 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1263
1264 if (!net_eq(dev_net(dev), link_net)) {
1265 int id = peernet2id_alloc(dev_net(dev), link_net);
1266
1267 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1268 goto nla_put_failure;
1269 }
1270 }
1271
1272 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1273 goto nla_put_failure;
1274
1275 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1276 if (af_ops->fill_link_af) {
1277 struct nlattr *af;
1278 int err;
1279
1280 if (!(af = nla_nest_start(skb, af_ops->family)))
1281 goto nla_put_failure;
1282
1283 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1284
1285 /*
1286 * Caller may return ENODATA to indicate that there
1287 * was no data to be dumped. This is not an error, it
1288 * means we should trim the attribute header and
1289 * continue.
1290 */
1291 if (err == -ENODATA)
1292 nla_nest_cancel(skb, af);
1293 else if (err < 0)
1294 goto nla_put_failure;
1295
1296 nla_nest_end(skb, af);
1297 }
1298 }
1299
1300 nla_nest_end(skb, af_spec);
1301
1302 nlmsg_end(skb, nlh);
1303 return 0;
1304
1305 nla_put_failure:
1306 nlmsg_cancel(skb, nlh);
1307 return -EMSGSIZE;
1308 }
1309
1310 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1311 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1312 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1313 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1314 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1315 [IFLA_MTU] = { .type = NLA_U32 },
1316 [IFLA_LINK] = { .type = NLA_U32 },
1317 [IFLA_MASTER] = { .type = NLA_U32 },
1318 [IFLA_CARRIER] = { .type = NLA_U8 },
1319 [IFLA_TXQLEN] = { .type = NLA_U32 },
1320 [IFLA_WEIGHT] = { .type = NLA_U32 },
1321 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1322 [IFLA_LINKMODE] = { .type = NLA_U8 },
1323 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1324 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1325 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1326 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1327 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1328 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1329 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1330 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1331 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1332 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1333 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1334 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1335 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1336 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1337 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1338 [IFLA_LINK_NETNSID] = { .type = NLA_S32 },
1339 [IFLA_PROTO_DOWN] = { .type = NLA_U8 },
1340 };
1341
1342 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1343 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1344 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1345 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1346 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1347 };
1348
1349 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1350 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
1351 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
1352 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
1353 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
1354 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) },
1355 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) },
1356 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) },
1357 [IFLA_VF_STATS] = { .type = NLA_NESTED },
1358 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) },
1359 };
1360
1361 static const struct nla_policy ifla_vf_stats_policy[IFLA_VF_STATS_MAX + 1] = {
1362 [IFLA_VF_STATS_RX_PACKETS] = { .type = NLA_U64 },
1363 [IFLA_VF_STATS_TX_PACKETS] = { .type = NLA_U64 },
1364 [IFLA_VF_STATS_RX_BYTES] = { .type = NLA_U64 },
1365 [IFLA_VF_STATS_TX_BYTES] = { .type = NLA_U64 },
1366 [IFLA_VF_STATS_BROADCAST] = { .type = NLA_U64 },
1367 [IFLA_VF_STATS_MULTICAST] = { .type = NLA_U64 },
1368 };
1369
1370 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1371 [IFLA_PORT_VF] = { .type = NLA_U32 },
1372 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1373 .len = PORT_PROFILE_MAX },
1374 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1375 .len = sizeof(struct ifla_port_vsi)},
1376 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1377 .len = PORT_UUID_MAX },
1378 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1379 .len = PORT_UUID_MAX },
1380 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1381 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1382 };
1383
1384 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1385 {
1386 struct net *net = sock_net(skb->sk);
1387 int h, s_h;
1388 int idx = 0, s_idx;
1389 struct net_device *dev;
1390 struct hlist_head *head;
1391 struct nlattr *tb[IFLA_MAX+1];
1392 u32 ext_filter_mask = 0;
1393 int err;
1394 int hdrlen;
1395
1396 s_h = cb->args[0];
1397 s_idx = cb->args[1];
1398
1399 cb->seq = net->dev_base_seq;
1400
1401 /* A hack to preserve kernel<->userspace interface.
1402 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1403 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1404 * what iproute2 < v3.9.0 used.
1405 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1406 * attribute, its netlink message is shorter than struct ifinfomsg.
1407 */
1408 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1409 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1410
1411 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1412
1413 if (tb[IFLA_EXT_MASK])
1414 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1415 }
1416
1417 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1418 idx = 0;
1419 head = &net->dev_index_head[h];
1420 hlist_for_each_entry(dev, head, index_hlist) {
1421 if (idx < s_idx)
1422 goto cont;
1423 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1424 NETLINK_CB(cb->skb).portid,
1425 cb->nlh->nlmsg_seq, 0,
1426 NLM_F_MULTI,
1427 ext_filter_mask);
1428 /* If we ran out of room on the first message,
1429 * we're in trouble
1430 */
1431 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1432
1433 if (err < 0)
1434 goto out;
1435
1436 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1437 cont:
1438 idx++;
1439 }
1440 }
1441 out:
1442 cb->args[1] = idx;
1443 cb->args[0] = h;
1444
1445 return skb->len;
1446 }
1447
1448 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1449 {
1450 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1451 }
1452 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1453
1454 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1455 {
1456 struct net *net;
1457 /* Examine the link attributes and figure out which
1458 * network namespace we are talking about.
1459 */
1460 if (tb[IFLA_NET_NS_PID])
1461 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1462 else if (tb[IFLA_NET_NS_FD])
1463 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1464 else
1465 net = get_net(src_net);
1466 return net;
1467 }
1468 EXPORT_SYMBOL(rtnl_link_get_net);
1469
1470 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1471 {
1472 if (dev) {
1473 if (tb[IFLA_ADDRESS] &&
1474 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1475 return -EINVAL;
1476
1477 if (tb[IFLA_BROADCAST] &&
1478 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1479 return -EINVAL;
1480 }
1481
1482 if (tb[IFLA_AF_SPEC]) {
1483 struct nlattr *af;
1484 int rem, err;
1485
1486 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1487 const struct rtnl_af_ops *af_ops;
1488
1489 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1490 return -EAFNOSUPPORT;
1491
1492 if (!af_ops->set_link_af)
1493 return -EOPNOTSUPP;
1494
1495 if (af_ops->validate_link_af) {
1496 err = af_ops->validate_link_af(dev, af);
1497 if (err < 0)
1498 return err;
1499 }
1500 }
1501 }
1502
1503 return 0;
1504 }
1505
1506 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1507 {
1508 const struct net_device_ops *ops = dev->netdev_ops;
1509 int err = -EINVAL;
1510
1511 if (tb[IFLA_VF_MAC]) {
1512 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1513
1514 err = -EOPNOTSUPP;
1515 if (ops->ndo_set_vf_mac)
1516 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1517 ivm->mac);
1518 if (err < 0)
1519 return err;
1520 }
1521
1522 if (tb[IFLA_VF_VLAN]) {
1523 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1524
1525 err = -EOPNOTSUPP;
1526 if (ops->ndo_set_vf_vlan)
1527 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1528 ivv->qos);
1529 if (err < 0)
1530 return err;
1531 }
1532
1533 if (tb[IFLA_VF_TX_RATE]) {
1534 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1535 struct ifla_vf_info ivf;
1536
1537 err = -EOPNOTSUPP;
1538 if (ops->ndo_get_vf_config)
1539 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1540 if (err < 0)
1541 return err;
1542
1543 err = -EOPNOTSUPP;
1544 if (ops->ndo_set_vf_rate)
1545 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1546 ivf.min_tx_rate,
1547 ivt->rate);
1548 if (err < 0)
1549 return err;
1550 }
1551
1552 if (tb[IFLA_VF_RATE]) {
1553 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1554
1555 err = -EOPNOTSUPP;
1556 if (ops->ndo_set_vf_rate)
1557 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1558 ivt->min_tx_rate,
1559 ivt->max_tx_rate);
1560 if (err < 0)
1561 return err;
1562 }
1563
1564 if (tb[IFLA_VF_SPOOFCHK]) {
1565 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1566
1567 err = -EOPNOTSUPP;
1568 if (ops->ndo_set_vf_spoofchk)
1569 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1570 ivs->setting);
1571 if (err < 0)
1572 return err;
1573 }
1574
1575 if (tb[IFLA_VF_LINK_STATE]) {
1576 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1577
1578 err = -EOPNOTSUPP;
1579 if (ops->ndo_set_vf_link_state)
1580 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1581 ivl->link_state);
1582 if (err < 0)
1583 return err;
1584 }
1585
1586 if (tb[IFLA_VF_RSS_QUERY_EN]) {
1587 struct ifla_vf_rss_query_en *ivrssq_en;
1588
1589 err = -EOPNOTSUPP;
1590 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1591 if (ops->ndo_set_vf_rss_query_en)
1592 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1593 ivrssq_en->setting);
1594 if (err < 0)
1595 return err;
1596 }
1597
1598 if (tb[IFLA_VF_TRUST]) {
1599 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
1600
1601 err = -EOPNOTSUPP;
1602 if (ops->ndo_set_vf_trust)
1603 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
1604 if (err < 0)
1605 return err;
1606 }
1607
1608 return err;
1609 }
1610
1611 static int do_set_master(struct net_device *dev, int ifindex)
1612 {
1613 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1614 const struct net_device_ops *ops;
1615 int err;
1616
1617 if (upper_dev) {
1618 if (upper_dev->ifindex == ifindex)
1619 return 0;
1620 ops = upper_dev->netdev_ops;
1621 if (ops->ndo_del_slave) {
1622 err = ops->ndo_del_slave(upper_dev, dev);
1623 if (err)
1624 return err;
1625 } else {
1626 return -EOPNOTSUPP;
1627 }
1628 }
1629
1630 if (ifindex) {
1631 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1632 if (!upper_dev)
1633 return -EINVAL;
1634 ops = upper_dev->netdev_ops;
1635 if (ops->ndo_add_slave) {
1636 err = ops->ndo_add_slave(upper_dev, dev);
1637 if (err)
1638 return err;
1639 } else {
1640 return -EOPNOTSUPP;
1641 }
1642 }
1643 return 0;
1644 }
1645
1646 #define DO_SETLINK_MODIFIED 0x01
1647 /* notify flag means notify + modified. */
1648 #define DO_SETLINK_NOTIFY 0x03
1649 static int do_setlink(const struct sk_buff *skb,
1650 struct net_device *dev, struct ifinfomsg *ifm,
1651 struct nlattr **tb, char *ifname, int status)
1652 {
1653 const struct net_device_ops *ops = dev->netdev_ops;
1654 int err;
1655
1656 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1657 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1658 if (IS_ERR(net)) {
1659 err = PTR_ERR(net);
1660 goto errout;
1661 }
1662 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1663 put_net(net);
1664 err = -EPERM;
1665 goto errout;
1666 }
1667 err = dev_change_net_namespace(dev, net, ifname);
1668 put_net(net);
1669 if (err)
1670 goto errout;
1671 status |= DO_SETLINK_MODIFIED;
1672 }
1673
1674 if (tb[IFLA_MAP]) {
1675 struct rtnl_link_ifmap *u_map;
1676 struct ifmap k_map;
1677
1678 if (!ops->ndo_set_config) {
1679 err = -EOPNOTSUPP;
1680 goto errout;
1681 }
1682
1683 if (!netif_device_present(dev)) {
1684 err = -ENODEV;
1685 goto errout;
1686 }
1687
1688 u_map = nla_data(tb[IFLA_MAP]);
1689 k_map.mem_start = (unsigned long) u_map->mem_start;
1690 k_map.mem_end = (unsigned long) u_map->mem_end;
1691 k_map.base_addr = (unsigned short) u_map->base_addr;
1692 k_map.irq = (unsigned char) u_map->irq;
1693 k_map.dma = (unsigned char) u_map->dma;
1694 k_map.port = (unsigned char) u_map->port;
1695
1696 err = ops->ndo_set_config(dev, &k_map);
1697 if (err < 0)
1698 goto errout;
1699
1700 status |= DO_SETLINK_NOTIFY;
1701 }
1702
1703 if (tb[IFLA_ADDRESS]) {
1704 struct sockaddr *sa;
1705 int len;
1706
1707 len = sizeof(sa_family_t) + dev->addr_len;
1708 sa = kmalloc(len, GFP_KERNEL);
1709 if (!sa) {
1710 err = -ENOMEM;
1711 goto errout;
1712 }
1713 sa->sa_family = dev->type;
1714 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1715 dev->addr_len);
1716 err = dev_set_mac_address(dev, sa);
1717 kfree(sa);
1718 if (err)
1719 goto errout;
1720 status |= DO_SETLINK_MODIFIED;
1721 }
1722
1723 if (tb[IFLA_MTU]) {
1724 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1725 if (err < 0)
1726 goto errout;
1727 status |= DO_SETLINK_MODIFIED;
1728 }
1729
1730 if (tb[IFLA_GROUP]) {
1731 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1732 status |= DO_SETLINK_NOTIFY;
1733 }
1734
1735 /*
1736 * Interface selected by interface index but interface
1737 * name provided implies that a name change has been
1738 * requested.
1739 */
1740 if (ifm->ifi_index > 0 && ifname[0]) {
1741 err = dev_change_name(dev, ifname);
1742 if (err < 0)
1743 goto errout;
1744 status |= DO_SETLINK_MODIFIED;
1745 }
1746
1747 if (tb[IFLA_IFALIAS]) {
1748 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1749 nla_len(tb[IFLA_IFALIAS]));
1750 if (err < 0)
1751 goto errout;
1752 status |= DO_SETLINK_NOTIFY;
1753 }
1754
1755 if (tb[IFLA_BROADCAST]) {
1756 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1757 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1758 }
1759
1760 if (ifm->ifi_flags || ifm->ifi_change) {
1761 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1762 if (err < 0)
1763 goto errout;
1764 }
1765
1766 if (tb[IFLA_MASTER]) {
1767 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1768 if (err)
1769 goto errout;
1770 status |= DO_SETLINK_MODIFIED;
1771 }
1772
1773 if (tb[IFLA_CARRIER]) {
1774 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1775 if (err)
1776 goto errout;
1777 status |= DO_SETLINK_MODIFIED;
1778 }
1779
1780 if (tb[IFLA_TXQLEN]) {
1781 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1782
1783 if (dev->tx_queue_len ^ value)
1784 status |= DO_SETLINK_NOTIFY;
1785
1786 dev->tx_queue_len = value;
1787 }
1788
1789 if (tb[IFLA_OPERSTATE])
1790 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1791
1792 if (tb[IFLA_LINKMODE]) {
1793 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1794
1795 write_lock_bh(&dev_base_lock);
1796 if (dev->link_mode ^ value)
1797 status |= DO_SETLINK_NOTIFY;
1798 dev->link_mode = value;
1799 write_unlock_bh(&dev_base_lock);
1800 }
1801
1802 if (tb[IFLA_VFINFO_LIST]) {
1803 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
1804 struct nlattr *attr;
1805 int rem;
1806
1807 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1808 if (nla_type(attr) != IFLA_VF_INFO ||
1809 nla_len(attr) < NLA_HDRLEN) {
1810 err = -EINVAL;
1811 goto errout;
1812 }
1813 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
1814 ifla_vf_policy);
1815 if (err < 0)
1816 goto errout;
1817 err = do_setvfinfo(dev, vfinfo);
1818 if (err < 0)
1819 goto errout;
1820 status |= DO_SETLINK_NOTIFY;
1821 }
1822 }
1823 err = 0;
1824
1825 if (tb[IFLA_VF_PORTS]) {
1826 struct nlattr *port[IFLA_PORT_MAX+1];
1827 struct nlattr *attr;
1828 int vf;
1829 int rem;
1830
1831 err = -EOPNOTSUPP;
1832 if (!ops->ndo_set_vf_port)
1833 goto errout;
1834
1835 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1836 if (nla_type(attr) != IFLA_VF_PORT ||
1837 nla_len(attr) < NLA_HDRLEN) {
1838 err = -EINVAL;
1839 goto errout;
1840 }
1841 err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
1842 ifla_port_policy);
1843 if (err < 0)
1844 goto errout;
1845 if (!port[IFLA_PORT_VF]) {
1846 err = -EOPNOTSUPP;
1847 goto errout;
1848 }
1849 vf = nla_get_u32(port[IFLA_PORT_VF]);
1850 err = ops->ndo_set_vf_port(dev, vf, port);
1851 if (err < 0)
1852 goto errout;
1853 status |= DO_SETLINK_NOTIFY;
1854 }
1855 }
1856 err = 0;
1857
1858 if (tb[IFLA_PORT_SELF]) {
1859 struct nlattr *port[IFLA_PORT_MAX+1];
1860
1861 err = nla_parse_nested(port, IFLA_PORT_MAX,
1862 tb[IFLA_PORT_SELF], ifla_port_policy);
1863 if (err < 0)
1864 goto errout;
1865
1866 err = -EOPNOTSUPP;
1867 if (ops->ndo_set_vf_port)
1868 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1869 if (err < 0)
1870 goto errout;
1871 status |= DO_SETLINK_NOTIFY;
1872 }
1873
1874 if (tb[IFLA_AF_SPEC]) {
1875 struct nlattr *af;
1876 int rem;
1877
1878 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1879 const struct rtnl_af_ops *af_ops;
1880
1881 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1882 BUG();
1883
1884 err = af_ops->set_link_af(dev, af);
1885 if (err < 0)
1886 goto errout;
1887
1888 status |= DO_SETLINK_NOTIFY;
1889 }
1890 }
1891 err = 0;
1892
1893 if (tb[IFLA_PROTO_DOWN]) {
1894 err = dev_change_proto_down(dev,
1895 nla_get_u8(tb[IFLA_PROTO_DOWN]));
1896 if (err)
1897 goto errout;
1898 status |= DO_SETLINK_NOTIFY;
1899 }
1900
1901 errout:
1902 if (status & DO_SETLINK_MODIFIED) {
1903 if (status & DO_SETLINK_NOTIFY)
1904 netdev_state_change(dev);
1905
1906 if (err < 0)
1907 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",
1908 dev->name);
1909 }
1910
1911 return err;
1912 }
1913
1914 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1915 {
1916 struct net *net = sock_net(skb->sk);
1917 struct ifinfomsg *ifm;
1918 struct net_device *dev;
1919 int err;
1920 struct nlattr *tb[IFLA_MAX+1];
1921 char ifname[IFNAMSIZ];
1922
1923 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1924 if (err < 0)
1925 goto errout;
1926
1927 if (tb[IFLA_IFNAME])
1928 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1929 else
1930 ifname[0] = '\0';
1931
1932 err = -EINVAL;
1933 ifm = nlmsg_data(nlh);
1934 if (ifm->ifi_index > 0)
1935 dev = __dev_get_by_index(net, ifm->ifi_index);
1936 else if (tb[IFLA_IFNAME])
1937 dev = __dev_get_by_name(net, ifname);
1938 else
1939 goto errout;
1940
1941 if (dev == NULL) {
1942 err = -ENODEV;
1943 goto errout;
1944 }
1945
1946 err = validate_linkmsg(dev, tb);
1947 if (err < 0)
1948 goto errout;
1949
1950 err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1951 errout:
1952 return err;
1953 }
1954
1955 static int rtnl_group_dellink(const struct net *net, int group)
1956 {
1957 struct net_device *dev, *aux;
1958 LIST_HEAD(list_kill);
1959 bool found = false;
1960
1961 if (!group)
1962 return -EPERM;
1963
1964 for_each_netdev(net, dev) {
1965 if (dev->group == group) {
1966 const struct rtnl_link_ops *ops;
1967
1968 found = true;
1969 ops = dev->rtnl_link_ops;
1970 if (!ops || !ops->dellink)
1971 return -EOPNOTSUPP;
1972 }
1973 }
1974
1975 if (!found)
1976 return -ENODEV;
1977
1978 for_each_netdev_safe(net, dev, aux) {
1979 if (dev->group == group) {
1980 const struct rtnl_link_ops *ops;
1981
1982 ops = dev->rtnl_link_ops;
1983 ops->dellink(dev, &list_kill);
1984 }
1985 }
1986 unregister_netdevice_many(&list_kill);
1987
1988 return 0;
1989 }
1990
1991 int rtnl_delete_link(struct net_device *dev)
1992 {
1993 const struct rtnl_link_ops *ops;
1994 LIST_HEAD(list_kill);
1995
1996 ops = dev->rtnl_link_ops;
1997 if (!ops || !ops->dellink)
1998 return -EOPNOTSUPP;
1999
2000 ops->dellink(dev, &list_kill);
2001 unregister_netdevice_many(&list_kill);
2002
2003 return 0;
2004 }
2005 EXPORT_SYMBOL_GPL(rtnl_delete_link);
2006
2007 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2008 {
2009 struct net *net = sock_net(skb->sk);
2010 struct net_device *dev;
2011 struct ifinfomsg *ifm;
2012 char ifname[IFNAMSIZ];
2013 struct nlattr *tb[IFLA_MAX+1];
2014 int err;
2015
2016 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2017 if (err < 0)
2018 return err;
2019
2020 if (tb[IFLA_IFNAME])
2021 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2022
2023 ifm = nlmsg_data(nlh);
2024 if (ifm->ifi_index > 0)
2025 dev = __dev_get_by_index(net, ifm->ifi_index);
2026 else if (tb[IFLA_IFNAME])
2027 dev = __dev_get_by_name(net, ifname);
2028 else if (tb[IFLA_GROUP])
2029 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
2030 else
2031 return -EINVAL;
2032
2033 if (!dev)
2034 return -ENODEV;
2035
2036 return rtnl_delete_link(dev);
2037 }
2038
2039 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2040 {
2041 unsigned int old_flags;
2042 int err;
2043
2044 old_flags = dev->flags;
2045 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2046 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2047 if (err < 0)
2048 return err;
2049 }
2050
2051 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2052
2053 __dev_notify_flags(dev, old_flags, ~0U);
2054 return 0;
2055 }
2056 EXPORT_SYMBOL(rtnl_configure_link);
2057
2058 struct net_device *rtnl_create_link(struct net *net,
2059 const char *ifname, unsigned char name_assign_type,
2060 const struct rtnl_link_ops *ops, struct nlattr *tb[])
2061 {
2062 int err;
2063 struct net_device *dev;
2064 unsigned int num_tx_queues = 1;
2065 unsigned int num_rx_queues = 1;
2066
2067 if (tb[IFLA_NUM_TX_QUEUES])
2068 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2069 else if (ops->get_num_tx_queues)
2070 num_tx_queues = ops->get_num_tx_queues();
2071
2072 if (tb[IFLA_NUM_RX_QUEUES])
2073 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2074 else if (ops->get_num_rx_queues)
2075 num_rx_queues = ops->get_num_rx_queues();
2076
2077 err = -ENOMEM;
2078 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2079 ops->setup, num_tx_queues, num_rx_queues);
2080 if (!dev)
2081 goto err;
2082
2083 dev_net_set(dev, net);
2084 dev->rtnl_link_ops = ops;
2085 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2086
2087 if (tb[IFLA_MTU])
2088 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2089 if (tb[IFLA_ADDRESS]) {
2090 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2091 nla_len(tb[IFLA_ADDRESS]));
2092 dev->addr_assign_type = NET_ADDR_SET;
2093 }
2094 if (tb[IFLA_BROADCAST])
2095 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2096 nla_len(tb[IFLA_BROADCAST]));
2097 if (tb[IFLA_TXQLEN])
2098 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2099 if (tb[IFLA_OPERSTATE])
2100 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2101 if (tb[IFLA_LINKMODE])
2102 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2103 if (tb[IFLA_GROUP])
2104 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2105
2106 return dev;
2107
2108 err:
2109 return ERR_PTR(err);
2110 }
2111 EXPORT_SYMBOL(rtnl_create_link);
2112
2113 static int rtnl_group_changelink(const struct sk_buff *skb,
2114 struct net *net, int group,
2115 struct ifinfomsg *ifm,
2116 struct nlattr **tb)
2117 {
2118 struct net_device *dev, *aux;
2119 int err;
2120
2121 for_each_netdev_safe(net, dev, aux) {
2122 if (dev->group == group) {
2123 err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2124 if (err < 0)
2125 return err;
2126 }
2127 }
2128
2129 return 0;
2130 }
2131
2132 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2133 {
2134 struct net *net = sock_net(skb->sk);
2135 const struct rtnl_link_ops *ops;
2136 const struct rtnl_link_ops *m_ops = NULL;
2137 struct net_device *dev;
2138 struct net_device *master_dev = NULL;
2139 struct ifinfomsg *ifm;
2140 char kind[MODULE_NAME_LEN];
2141 char ifname[IFNAMSIZ];
2142 struct nlattr *tb[IFLA_MAX+1];
2143 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2144 unsigned char name_assign_type = NET_NAME_USER;
2145 int err;
2146
2147 #ifdef CONFIG_MODULES
2148 replay:
2149 #endif
2150 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2151 if (err < 0)
2152 return err;
2153
2154 if (tb[IFLA_IFNAME])
2155 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2156 else
2157 ifname[0] = '\0';
2158
2159 ifm = nlmsg_data(nlh);
2160 if (ifm->ifi_index > 0)
2161 dev = __dev_get_by_index(net, ifm->ifi_index);
2162 else {
2163 if (ifname[0])
2164 dev = __dev_get_by_name(net, ifname);
2165 else
2166 dev = NULL;
2167 }
2168
2169 if (dev) {
2170 master_dev = netdev_master_upper_dev_get(dev);
2171 if (master_dev)
2172 m_ops = master_dev->rtnl_link_ops;
2173 }
2174
2175 err = validate_linkmsg(dev, tb);
2176 if (err < 0)
2177 return err;
2178
2179 if (tb[IFLA_LINKINFO]) {
2180 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2181 tb[IFLA_LINKINFO], ifla_info_policy);
2182 if (err < 0)
2183 return err;
2184 } else
2185 memset(linkinfo, 0, sizeof(linkinfo));
2186
2187 if (linkinfo[IFLA_INFO_KIND]) {
2188 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2189 ops = rtnl_link_ops_get(kind);
2190 } else {
2191 kind[0] = '\0';
2192 ops = NULL;
2193 }
2194
2195 if (1) {
2196 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2197 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2198 struct nlattr **data = NULL;
2199 struct nlattr **slave_data = NULL;
2200 struct net *dest_net, *link_net = NULL;
2201
2202 if (ops) {
2203 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2204 err = nla_parse_nested(attr, ops->maxtype,
2205 linkinfo[IFLA_INFO_DATA],
2206 ops->policy);
2207 if (err < 0)
2208 return err;
2209 data = attr;
2210 }
2211 if (ops->validate) {
2212 err = ops->validate(tb, data);
2213 if (err < 0)
2214 return err;
2215 }
2216 }
2217
2218 if (m_ops) {
2219 if (m_ops->slave_maxtype &&
2220 linkinfo[IFLA_INFO_SLAVE_DATA]) {
2221 err = nla_parse_nested(slave_attr,
2222 m_ops->slave_maxtype,
2223 linkinfo[IFLA_INFO_SLAVE_DATA],
2224 m_ops->slave_policy);
2225 if (err < 0)
2226 return err;
2227 slave_data = slave_attr;
2228 }
2229 if (m_ops->slave_validate) {
2230 err = m_ops->slave_validate(tb, slave_data);
2231 if (err < 0)
2232 return err;
2233 }
2234 }
2235
2236 if (dev) {
2237 int status = 0;
2238
2239 if (nlh->nlmsg_flags & NLM_F_EXCL)
2240 return -EEXIST;
2241 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2242 return -EOPNOTSUPP;
2243
2244 if (linkinfo[IFLA_INFO_DATA]) {
2245 if (!ops || ops != dev->rtnl_link_ops ||
2246 !ops->changelink)
2247 return -EOPNOTSUPP;
2248
2249 err = ops->changelink(dev, tb, data);
2250 if (err < 0)
2251 return err;
2252 status |= DO_SETLINK_NOTIFY;
2253 }
2254
2255 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2256 if (!m_ops || !m_ops->slave_changelink)
2257 return -EOPNOTSUPP;
2258
2259 err = m_ops->slave_changelink(master_dev, dev,
2260 tb, slave_data);
2261 if (err < 0)
2262 return err;
2263 status |= DO_SETLINK_NOTIFY;
2264 }
2265
2266 return do_setlink(skb, dev, ifm, tb, ifname, status);
2267 }
2268
2269 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2270 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2271 return rtnl_group_changelink(skb, net,
2272 nla_get_u32(tb[IFLA_GROUP]),
2273 ifm, tb);
2274 return -ENODEV;
2275 }
2276
2277 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2278 return -EOPNOTSUPP;
2279
2280 if (!ops) {
2281 #ifdef CONFIG_MODULES
2282 if (kind[0]) {
2283 __rtnl_unlock();
2284 request_module("rtnl-link-%s", kind);
2285 rtnl_lock();
2286 ops = rtnl_link_ops_get(kind);
2287 if (ops)
2288 goto replay;
2289 }
2290 #endif
2291 return -EOPNOTSUPP;
2292 }
2293
2294 if (!ops->setup)
2295 return -EOPNOTSUPP;
2296
2297 if (!ifname[0]) {
2298 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2299 name_assign_type = NET_NAME_ENUM;
2300 }
2301
2302 dest_net = rtnl_link_get_net(net, tb);
2303 if (IS_ERR(dest_net))
2304 return PTR_ERR(dest_net);
2305
2306 err = -EPERM;
2307 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2308 goto out;
2309
2310 if (tb[IFLA_LINK_NETNSID]) {
2311 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2312
2313 link_net = get_net_ns_by_id(dest_net, id);
2314 if (!link_net) {
2315 err = -EINVAL;
2316 goto out;
2317 }
2318 err = -EPERM;
2319 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2320 goto out;
2321 }
2322
2323 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2324 name_assign_type, ops, tb);
2325 if (IS_ERR(dev)) {
2326 err = PTR_ERR(dev);
2327 goto out;
2328 }
2329
2330 dev->ifindex = ifm->ifi_index;
2331
2332 if (ops->newlink) {
2333 err = ops->newlink(link_net ? : net, dev, tb, data);
2334 /* Drivers should call free_netdev() in ->destructor
2335 * and unregister it on failure after registration
2336 * so that device could be finally freed in rtnl_unlock.
2337 */
2338 if (err < 0) {
2339 /* If device is not registered at all, free it now */
2340 if (dev->reg_state == NETREG_UNINITIALIZED)
2341 free_netdev(dev);
2342 goto out;
2343 }
2344 } else {
2345 err = register_netdevice(dev);
2346 if (err < 0) {
2347 free_netdev(dev);
2348 goto out;
2349 }
2350 }
2351 err = rtnl_configure_link(dev, ifm);
2352 if (err < 0)
2353 goto out_unregister;
2354 if (link_net) {
2355 err = dev_change_net_namespace(dev, dest_net, ifname);
2356 if (err < 0)
2357 goto out_unregister;
2358 }
2359 out:
2360 if (link_net)
2361 put_net(link_net);
2362 put_net(dest_net);
2363 return err;
2364 out_unregister:
2365 if (ops->newlink) {
2366 LIST_HEAD(list_kill);
2367
2368 ops->dellink(dev, &list_kill);
2369 unregister_netdevice_many(&list_kill);
2370 } else {
2371 unregister_netdevice(dev);
2372 }
2373 goto out;
2374 }
2375 }
2376
2377 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2378 {
2379 struct net *net = sock_net(skb->sk);
2380 struct ifinfomsg *ifm;
2381 char ifname[IFNAMSIZ];
2382 struct nlattr *tb[IFLA_MAX+1];
2383 struct net_device *dev = NULL;
2384 struct sk_buff *nskb;
2385 int err;
2386 u32 ext_filter_mask = 0;
2387
2388 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2389 if (err < 0)
2390 return err;
2391
2392 if (tb[IFLA_IFNAME])
2393 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2394
2395 if (tb[IFLA_EXT_MASK])
2396 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2397
2398 ifm = nlmsg_data(nlh);
2399 if (ifm->ifi_index > 0)
2400 dev = __dev_get_by_index(net, ifm->ifi_index);
2401 else if (tb[IFLA_IFNAME])
2402 dev = __dev_get_by_name(net, ifname);
2403 else
2404 return -EINVAL;
2405
2406 if (dev == NULL)
2407 return -ENODEV;
2408
2409 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2410 if (nskb == NULL)
2411 return -ENOBUFS;
2412
2413 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2414 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2415 if (err < 0) {
2416 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2417 WARN_ON(err == -EMSGSIZE);
2418 kfree_skb(nskb);
2419 } else
2420 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2421
2422 return err;
2423 }
2424
2425 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2426 {
2427 struct net *net = sock_net(skb->sk);
2428 struct net_device *dev;
2429 struct nlattr *tb[IFLA_MAX+1];
2430 u32 ext_filter_mask = 0;
2431 u16 min_ifinfo_dump_size = 0;
2432 int hdrlen;
2433
2434 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2435 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2436 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2437
2438 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2439 if (tb[IFLA_EXT_MASK])
2440 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2441 }
2442
2443 if (!ext_filter_mask)
2444 return NLMSG_GOODSIZE;
2445 /*
2446 * traverse the list of net devices and compute the minimum
2447 * buffer size based upon the filter mask.
2448 */
2449 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2450 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2451 if_nlmsg_size(dev,
2452 ext_filter_mask));
2453 }
2454
2455 return min_ifinfo_dump_size;
2456 }
2457
2458 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2459 {
2460 int idx;
2461 int s_idx = cb->family;
2462
2463 if (s_idx == 0)
2464 s_idx = 1;
2465 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2466 int type = cb->nlh->nlmsg_type-RTM_BASE;
2467 if (idx < s_idx || idx == PF_PACKET)
2468 continue;
2469 if (rtnl_msg_handlers[idx] == NULL ||
2470 rtnl_msg_handlers[idx][type].dumpit == NULL)
2471 continue;
2472 if (idx > s_idx) {
2473 memset(&cb->args[0], 0, sizeof(cb->args));
2474 cb->prev_seq = 0;
2475 cb->seq = 0;
2476 }
2477 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2478 break;
2479 }
2480 cb->family = idx;
2481
2482 return skb->len;
2483 }
2484
2485 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2486 unsigned int change, gfp_t flags)
2487 {
2488 struct net *net = dev_net(dev);
2489 struct sk_buff *skb;
2490 int err = -ENOBUFS;
2491 size_t if_info_size;
2492
2493 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2494 if (skb == NULL)
2495 goto errout;
2496
2497 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2498 if (err < 0) {
2499 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2500 WARN_ON(err == -EMSGSIZE);
2501 kfree_skb(skb);
2502 goto errout;
2503 }
2504 return skb;
2505 errout:
2506 if (err < 0)
2507 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2508 return NULL;
2509 }
2510
2511 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2512 {
2513 struct net *net = dev_net(dev);
2514
2515 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2516 }
2517
2518 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2519 gfp_t flags)
2520 {
2521 struct sk_buff *skb;
2522
2523 if (dev->reg_state != NETREG_REGISTERED)
2524 return;
2525
2526 skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2527 if (skb)
2528 rtmsg_ifinfo_send(skb, dev, flags);
2529 }
2530 EXPORT_SYMBOL(rtmsg_ifinfo);
2531
2532 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2533 struct net_device *dev,
2534 u8 *addr, u16 vid, u32 pid, u32 seq,
2535 int type, unsigned int flags,
2536 int nlflags)
2537 {
2538 struct nlmsghdr *nlh;
2539 struct ndmsg *ndm;
2540
2541 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2542 if (!nlh)
2543 return -EMSGSIZE;
2544
2545 ndm = nlmsg_data(nlh);
2546 ndm->ndm_family = AF_BRIDGE;
2547 ndm->ndm_pad1 = 0;
2548 ndm->ndm_pad2 = 0;
2549 ndm->ndm_flags = flags;
2550 ndm->ndm_type = 0;
2551 ndm->ndm_ifindex = dev->ifindex;
2552 ndm->ndm_state = NUD_PERMANENT;
2553
2554 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2555 goto nla_put_failure;
2556 if (vid)
2557 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
2558 goto nla_put_failure;
2559
2560 nlmsg_end(skb, nlh);
2561 return 0;
2562
2563 nla_put_failure:
2564 nlmsg_cancel(skb, nlh);
2565 return -EMSGSIZE;
2566 }
2567
2568 static inline size_t rtnl_fdb_nlmsg_size(void)
2569 {
2570 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2571 }
2572
2573 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type)
2574 {
2575 struct net *net = dev_net(dev);
2576 struct sk_buff *skb;
2577 int err = -ENOBUFS;
2578
2579 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2580 if (!skb)
2581 goto errout;
2582
2583 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
2584 0, 0, type, NTF_SELF, 0);
2585 if (err < 0) {
2586 kfree_skb(skb);
2587 goto errout;
2588 }
2589
2590 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2591 return;
2592 errout:
2593 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2594 }
2595
2596 /**
2597 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2598 */
2599 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2600 struct nlattr *tb[],
2601 struct net_device *dev,
2602 const unsigned char *addr, u16 vid,
2603 u16 flags)
2604 {
2605 int err = -EINVAL;
2606
2607 /* If aging addresses are supported device will need to
2608 * implement its own handler for this.
2609 */
2610 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2611 pr_info("%s: FDB only supports static addresses\n", dev->name);
2612 return err;
2613 }
2614
2615 if (vid) {
2616 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2617 return err;
2618 }
2619
2620 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2621 err = dev_uc_add_excl(dev, addr);
2622 else if (is_multicast_ether_addr(addr))
2623 err = dev_mc_add_excl(dev, addr);
2624
2625 /* Only return duplicate errors if NLM_F_EXCL is set */
2626 if (err == -EEXIST && !(flags & NLM_F_EXCL))
2627 err = 0;
2628
2629 return err;
2630 }
2631 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2632
2633 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2634 {
2635 u16 vid = 0;
2636
2637 if (vlan_attr) {
2638 if (nla_len(vlan_attr) != sizeof(u16)) {
2639 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2640 return -EINVAL;
2641 }
2642
2643 vid = nla_get_u16(vlan_attr);
2644
2645 if (!vid || vid >= VLAN_VID_MASK) {
2646 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2647 vid);
2648 return -EINVAL;
2649 }
2650 }
2651 *p_vid = vid;
2652 return 0;
2653 }
2654
2655 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2656 {
2657 struct net *net = sock_net(skb->sk);
2658 struct ndmsg *ndm;
2659 struct nlattr *tb[NDA_MAX+1];
2660 struct net_device *dev;
2661 u8 *addr;
2662 u16 vid;
2663 int err;
2664
2665 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2666 if (err < 0)
2667 return err;
2668
2669 ndm = nlmsg_data(nlh);
2670 if (ndm->ndm_ifindex == 0) {
2671 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2672 return -EINVAL;
2673 }
2674
2675 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2676 if (dev == NULL) {
2677 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2678 return -ENODEV;
2679 }
2680
2681 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2682 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2683 return -EINVAL;
2684 }
2685
2686 addr = nla_data(tb[NDA_LLADDR]);
2687
2688 err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2689 if (err)
2690 return err;
2691
2692 err = -EOPNOTSUPP;
2693
2694 /* Support fdb on master device the net/bridge default case */
2695 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2696 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2697 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2698 const struct net_device_ops *ops = br_dev->netdev_ops;
2699
2700 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2701 nlh->nlmsg_flags);
2702 if (err)
2703 goto out;
2704 else
2705 ndm->ndm_flags &= ~NTF_MASTER;
2706 }
2707
2708 /* Embedded bridge, macvlan, and any other device support */
2709 if ((ndm->ndm_flags & NTF_SELF)) {
2710 if (dev->netdev_ops->ndo_fdb_add)
2711 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2712 vid,
2713 nlh->nlmsg_flags);
2714 else
2715 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2716 nlh->nlmsg_flags);
2717
2718 if (!err) {
2719 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH);
2720 ndm->ndm_flags &= ~NTF_SELF;
2721 }
2722 }
2723 out:
2724 return err;
2725 }
2726
2727 /**
2728 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2729 */
2730 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2731 struct nlattr *tb[],
2732 struct net_device *dev,
2733 const unsigned char *addr, u16 vid)
2734 {
2735 int err = -EINVAL;
2736
2737 /* If aging addresses are supported device will need to
2738 * implement its own handler for this.
2739 */
2740 if (!(ndm->ndm_state & NUD_PERMANENT)) {
2741 pr_info("%s: FDB only supports static addresses\n", dev->name);
2742 return err;
2743 }
2744
2745 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2746 err = dev_uc_del(dev, addr);
2747 else if (is_multicast_ether_addr(addr))
2748 err = dev_mc_del(dev, addr);
2749
2750 return err;
2751 }
2752 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2753
2754 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2755 {
2756 struct net *net = sock_net(skb->sk);
2757 struct ndmsg *ndm;
2758 struct nlattr *tb[NDA_MAX+1];
2759 struct net_device *dev;
2760 int err = -EINVAL;
2761 __u8 *addr;
2762 u16 vid;
2763
2764 if (!netlink_capable(skb, CAP_NET_ADMIN))
2765 return -EPERM;
2766
2767 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2768 if (err < 0)
2769 return err;
2770
2771 ndm = nlmsg_data(nlh);
2772 if (ndm->ndm_ifindex == 0) {
2773 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2774 return -EINVAL;
2775 }
2776
2777 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2778 if (dev == NULL) {
2779 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2780 return -ENODEV;
2781 }
2782
2783 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2784 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2785 return -EINVAL;
2786 }
2787
2788 addr = nla_data(tb[NDA_LLADDR]);
2789
2790 err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2791 if (err)
2792 return err;
2793
2794 err = -EOPNOTSUPP;
2795
2796 /* Support fdb on master device the net/bridge default case */
2797 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2798 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2799 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2800 const struct net_device_ops *ops = br_dev->netdev_ops;
2801
2802 if (ops->ndo_fdb_del)
2803 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
2804
2805 if (err)
2806 goto out;
2807 else
2808 ndm->ndm_flags &= ~NTF_MASTER;
2809 }
2810
2811 /* Embedded bridge, macvlan, and any other device support */
2812 if (ndm->ndm_flags & NTF_SELF) {
2813 if (dev->netdev_ops->ndo_fdb_del)
2814 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
2815 vid);
2816 else
2817 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
2818
2819 if (!err) {
2820 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH);
2821 ndm->ndm_flags &= ~NTF_SELF;
2822 }
2823 }
2824 out:
2825 return err;
2826 }
2827
2828 static int nlmsg_populate_fdb(struct sk_buff *skb,
2829 struct netlink_callback *cb,
2830 struct net_device *dev,
2831 int *idx,
2832 struct netdev_hw_addr_list *list)
2833 {
2834 struct netdev_hw_addr *ha;
2835 int err;
2836 u32 portid, seq;
2837
2838 portid = NETLINK_CB(cb->skb).portid;
2839 seq = cb->nlh->nlmsg_seq;
2840
2841 list_for_each_entry(ha, &list->list, list) {
2842 if (*idx < cb->args[0])
2843 goto skip;
2844
2845 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
2846 portid, seq,
2847 RTM_NEWNEIGH, NTF_SELF,
2848 NLM_F_MULTI);
2849 if (err < 0)
2850 return err;
2851 skip:
2852 *idx += 1;
2853 }
2854 return 0;
2855 }
2856
2857 /**
2858 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2859 * @nlh: netlink message header
2860 * @dev: netdevice
2861 *
2862 * Default netdevice operation to dump the existing unicast address list.
2863 * Returns number of addresses from list put in skb.
2864 */
2865 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2866 struct netlink_callback *cb,
2867 struct net_device *dev,
2868 struct net_device *filter_dev,
2869 int idx)
2870 {
2871 int err;
2872
2873 netif_addr_lock_bh(dev);
2874 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2875 if (err)
2876 goto out;
2877 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2878 out:
2879 netif_addr_unlock_bh(dev);
2880 return idx;
2881 }
2882 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2883
2884 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2885 {
2886 struct net_device *dev;
2887 struct nlattr *tb[IFLA_MAX+1];
2888 struct net_device *br_dev = NULL;
2889 const struct net_device_ops *ops = NULL;
2890 const struct net_device_ops *cops = NULL;
2891 struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2892 struct net *net = sock_net(skb->sk);
2893 int brport_idx = 0;
2894 int br_idx = 0;
2895 int idx = 0;
2896
2897 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2898 ifla_policy) == 0) {
2899 if (tb[IFLA_MASTER])
2900 br_idx = nla_get_u32(tb[IFLA_MASTER]);
2901 }
2902
2903 brport_idx = ifm->ifi_index;
2904
2905 if (br_idx) {
2906 br_dev = __dev_get_by_index(net, br_idx);
2907 if (!br_dev)
2908 return -ENODEV;
2909
2910 ops = br_dev->netdev_ops;
2911 }
2912
2913 for_each_netdev(net, dev) {
2914 if (brport_idx && (dev->ifindex != brport_idx))
2915 continue;
2916
2917 if (!br_idx) { /* user did not specify a specific bridge */
2918 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2919 br_dev = netdev_master_upper_dev_get(dev);
2920 cops = br_dev->netdev_ops;
2921 }
2922
2923 } else {
2924 if (dev != br_dev &&
2925 !(dev->priv_flags & IFF_BRIDGE_PORT))
2926 continue;
2927
2928 if (br_dev != netdev_master_upper_dev_get(dev) &&
2929 !(dev->priv_flags & IFF_EBRIDGE))
2930 continue;
2931
2932 cops = ops;
2933 }
2934
2935 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2936 if (cops && cops->ndo_fdb_dump)
2937 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2938 idx);
2939 }
2940
2941 if (dev->netdev_ops->ndo_fdb_dump)
2942 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
2943 idx);
2944 else
2945 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2946
2947 cops = NULL;
2948 }
2949
2950 cb->args[0] = idx;
2951 return skb->len;
2952 }
2953
2954 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
2955 unsigned int attrnum, unsigned int flag)
2956 {
2957 if (mask & flag)
2958 return nla_put_u8(skb, attrnum, !!(flags & flag));
2959 return 0;
2960 }
2961
2962 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2963 struct net_device *dev, u16 mode,
2964 u32 flags, u32 mask, int nlflags,
2965 u32 filter_mask,
2966 int (*vlan_fill)(struct sk_buff *skb,
2967 struct net_device *dev,
2968 u32 filter_mask))
2969 {
2970 struct nlmsghdr *nlh;
2971 struct ifinfomsg *ifm;
2972 struct nlattr *br_afspec;
2973 struct nlattr *protinfo;
2974 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2975 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2976 int err = 0;
2977
2978 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
2979 if (nlh == NULL)
2980 return -EMSGSIZE;
2981
2982 ifm = nlmsg_data(nlh);
2983 ifm->ifi_family = AF_BRIDGE;
2984 ifm->__ifi_pad = 0;
2985 ifm->ifi_type = dev->type;
2986 ifm->ifi_index = dev->ifindex;
2987 ifm->ifi_flags = dev_get_flags(dev);
2988 ifm->ifi_change = 0;
2989
2990
2991 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2992 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2993 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2994 (br_dev &&
2995 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2996 (dev->addr_len &&
2997 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2998 (dev->ifindex != dev_get_iflink(dev) &&
2999 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3000 goto nla_put_failure;
3001
3002 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3003 if (!br_afspec)
3004 goto nla_put_failure;
3005
3006 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3007 nla_nest_cancel(skb, br_afspec);
3008 goto nla_put_failure;
3009 }
3010
3011 if (mode != BRIDGE_MODE_UNDEF) {
3012 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3013 nla_nest_cancel(skb, br_afspec);
3014 goto nla_put_failure;
3015 }
3016 }
3017 if (vlan_fill) {
3018 err = vlan_fill(skb, dev, filter_mask);
3019 if (err) {
3020 nla_nest_cancel(skb, br_afspec);
3021 goto nla_put_failure;
3022 }
3023 }
3024 nla_nest_end(skb, br_afspec);
3025
3026 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3027 if (!protinfo)
3028 goto nla_put_failure;
3029
3030 if (brport_nla_put_flag(skb, flags, mask,
3031 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3032 brport_nla_put_flag(skb, flags, mask,
3033 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3034 brport_nla_put_flag(skb, flags, mask,
3035 IFLA_BRPORT_FAST_LEAVE,
3036 BR_MULTICAST_FAST_LEAVE) ||
3037 brport_nla_put_flag(skb, flags, mask,
3038 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3039 brport_nla_put_flag(skb, flags, mask,
3040 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3041 brport_nla_put_flag(skb, flags, mask,
3042 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3043 brport_nla_put_flag(skb, flags, mask,
3044 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3045 brport_nla_put_flag(skb, flags, mask,
3046 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3047 nla_nest_cancel(skb, protinfo);
3048 goto nla_put_failure;
3049 }
3050
3051 nla_nest_end(skb, protinfo);
3052
3053 nlmsg_end(skb, nlh);
3054 return 0;
3055 nla_put_failure:
3056 nlmsg_cancel(skb, nlh);
3057 return err ? err : -EMSGSIZE;
3058 }
3059 EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3060
3061 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3062 {
3063 struct net *net = sock_net(skb->sk);
3064 struct net_device *dev;
3065 int idx = 0;
3066 u32 portid = NETLINK_CB(cb->skb).portid;
3067 u32 seq = cb->nlh->nlmsg_seq;
3068 u32 filter_mask = 0;
3069 int err;
3070
3071 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3072 struct nlattr *extfilt;
3073
3074 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3075 IFLA_EXT_MASK);
3076 if (extfilt) {
3077 if (nla_len(extfilt) < sizeof(filter_mask))
3078 return -EINVAL;
3079
3080 filter_mask = nla_get_u32(extfilt);
3081 }
3082 }
3083
3084 rcu_read_lock();
3085 for_each_netdev_rcu(net, dev) {
3086 const struct net_device_ops *ops = dev->netdev_ops;
3087 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3088
3089 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3090 if (idx >= cb->args[0]) {
3091 err = br_dev->netdev_ops->ndo_bridge_getlink(
3092 skb, portid, seq, dev,
3093 filter_mask, NLM_F_MULTI);
3094 if (err < 0 && err != -EOPNOTSUPP)
3095 break;
3096 }
3097 idx++;
3098 }
3099
3100 if (ops->ndo_bridge_getlink) {
3101 if (idx >= cb->args[0]) {
3102 err = ops->ndo_bridge_getlink(skb, portid,
3103 seq, dev,
3104 filter_mask,
3105 NLM_F_MULTI);
3106 if (err < 0 && err != -EOPNOTSUPP)
3107 break;
3108 }
3109 idx++;
3110 }
3111 }
3112 rcu_read_unlock();
3113 cb->args[0] = idx;
3114
3115 return skb->len;
3116 }
3117
3118 static inline size_t bridge_nlmsg_size(void)
3119 {
3120 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3121 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3122 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3123 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
3124 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
3125 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
3126 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
3127 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
3128 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3129 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
3130 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
3131 }
3132
3133 static int rtnl_bridge_notify(struct net_device *dev)
3134 {
3135 struct net *net = dev_net(dev);
3136 struct sk_buff *skb;
3137 int err = -EOPNOTSUPP;
3138
3139 if (!dev->netdev_ops->ndo_bridge_getlink)
3140 return 0;
3141
3142 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3143 if (!skb) {
3144 err = -ENOMEM;
3145 goto errout;
3146 }
3147
3148 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3149 if (err < 0)
3150 goto errout;
3151
3152 if (!skb->len)
3153 goto errout;
3154
3155 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3156 return 0;
3157 errout:
3158 WARN_ON(err == -EMSGSIZE);
3159 kfree_skb(skb);
3160 if (err)
3161 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3162 return err;
3163 }
3164
3165 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3166 {
3167 struct net *net = sock_net(skb->sk);
3168 struct ifinfomsg *ifm;
3169 struct net_device *dev;
3170 struct nlattr *br_spec, *attr = NULL;
3171 int rem, err = -EOPNOTSUPP;
3172 u16 flags = 0;
3173 bool have_flags = false;
3174
3175 if (nlmsg_len(nlh) < sizeof(*ifm))
3176 return -EINVAL;
3177
3178 ifm = nlmsg_data(nlh);
3179 if (ifm->ifi_family != AF_BRIDGE)
3180 return -EPFNOSUPPORT;
3181
3182 dev = __dev_get_by_index(net, ifm->ifi_index);
3183 if (!dev) {
3184 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3185 return -ENODEV;
3186 }
3187
3188 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3189 if (br_spec) {
3190 nla_for_each_nested(attr, br_spec, rem) {
3191 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3192 if (nla_len(attr) < sizeof(flags))
3193 return -EINVAL;
3194
3195 have_flags = true;
3196 flags = nla_get_u16(attr);
3197 break;
3198 }
3199 }
3200 }
3201
3202 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3203 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3204
3205 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3206 err = -EOPNOTSUPP;
3207 goto out;
3208 }
3209
3210 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3211 if (err)
3212 goto out;
3213
3214 flags &= ~BRIDGE_FLAGS_MASTER;
3215 }
3216
3217 if ((flags & BRIDGE_FLAGS_SELF)) {
3218 if (!dev->netdev_ops->ndo_bridge_setlink)
3219 err = -EOPNOTSUPP;
3220 else
3221 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3222 flags);
3223 if (!err) {
3224 flags &= ~BRIDGE_FLAGS_SELF;
3225
3226 /* Generate event to notify upper layer of bridge
3227 * change
3228 */
3229 err = rtnl_bridge_notify(dev);
3230 }
3231 }
3232
3233 if (have_flags)
3234 memcpy(nla_data(attr), &flags, sizeof(flags));
3235 out:
3236 return err;
3237 }
3238
3239 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3240 {
3241 struct net *net = sock_net(skb->sk);
3242 struct ifinfomsg *ifm;
3243 struct net_device *dev;
3244 struct nlattr *br_spec, *attr = NULL;
3245 int rem, err = -EOPNOTSUPP;
3246 u16 flags = 0;
3247 bool have_flags = false;
3248
3249 if (nlmsg_len(nlh) < sizeof(*ifm))
3250 return -EINVAL;
3251
3252 ifm = nlmsg_data(nlh);
3253 if (ifm->ifi_family != AF_BRIDGE)
3254 return -EPFNOSUPPORT;
3255
3256 dev = __dev_get_by_index(net, ifm->ifi_index);
3257 if (!dev) {
3258 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3259 return -ENODEV;
3260 }
3261
3262 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3263 if (br_spec) {
3264 nla_for_each_nested(attr, br_spec, rem) {
3265 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3266 if (nla_len(attr) < sizeof(flags))
3267 return -EINVAL;
3268
3269 have_flags = true;
3270 flags = nla_get_u16(attr);
3271 break;
3272 }
3273 }
3274 }
3275
3276 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3277 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3278
3279 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3280 err = -EOPNOTSUPP;
3281 goto out;
3282 }
3283
3284 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3285 if (err)
3286 goto out;
3287
3288 flags &= ~BRIDGE_FLAGS_MASTER;
3289 }
3290
3291 if ((flags & BRIDGE_FLAGS_SELF)) {
3292 if (!dev->netdev_ops->ndo_bridge_dellink)
3293 err = -EOPNOTSUPP;
3294 else
3295 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3296 flags);
3297
3298 if (!err) {
3299 flags &= ~BRIDGE_FLAGS_SELF;
3300
3301 /* Generate event to notify upper layer of bridge
3302 * change
3303 */
3304 err = rtnl_bridge_notify(dev);
3305 }
3306 }
3307
3308 if (have_flags)
3309 memcpy(nla_data(attr), &flags, sizeof(flags));
3310 out:
3311 return err;
3312 }
3313
3314 /* Process one rtnetlink message. */
3315
3316 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3317 {
3318 struct net *net = sock_net(skb->sk);
3319 rtnl_doit_func doit;
3320 int sz_idx, kind;
3321 int family;
3322 int type;
3323 int err;
3324
3325 type = nlh->nlmsg_type;
3326 if (type > RTM_MAX)
3327 return -EOPNOTSUPP;
3328
3329 type -= RTM_BASE;
3330
3331 /* All the messages must have at least 1 byte length */
3332 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3333 return 0;
3334
3335 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3336 sz_idx = type>>2;
3337 kind = type&3;
3338
3339 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3340 return -EPERM;
3341
3342 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3343 struct sock *rtnl;
3344 rtnl_dumpit_func dumpit;
3345 rtnl_calcit_func calcit;
3346 u16 min_dump_alloc = 0;
3347
3348 dumpit = rtnl_get_dumpit(family, type);
3349 if (dumpit == NULL)
3350 return -EOPNOTSUPP;
3351 calcit = rtnl_get_calcit(family, type);
3352 if (calcit)
3353 min_dump_alloc = calcit(skb, nlh);
3354
3355 __rtnl_unlock();
3356 rtnl = net->rtnl;
3357 {
3358 struct netlink_dump_control c = {
3359 .dump = dumpit,
3360 .min_dump_alloc = min_dump_alloc,
3361 };
3362 err = netlink_dump_start(rtnl, skb, nlh, &c);
3363 }
3364 rtnl_lock();
3365 return err;
3366 }
3367
3368 doit = rtnl_get_doit(family, type);
3369 if (doit == NULL)
3370 return -EOPNOTSUPP;
3371
3372 return doit(skb, nlh);
3373 }
3374
3375 static void rtnetlink_rcv(struct sk_buff *skb)
3376 {
3377 rtnl_lock();
3378 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3379 rtnl_unlock();
3380 }
3381
3382 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3383 {
3384 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3385
3386 switch (event) {
3387 case NETDEV_UP:
3388 case NETDEV_DOWN:
3389 case NETDEV_PRE_UP:
3390 case NETDEV_POST_INIT:
3391 case NETDEV_REGISTER:
3392 case NETDEV_CHANGE:
3393 case NETDEV_PRE_TYPE_CHANGE:
3394 case NETDEV_GOING_DOWN:
3395 case NETDEV_UNREGISTER:
3396 case NETDEV_UNREGISTER_FINAL:
3397 case NETDEV_RELEASE:
3398 case NETDEV_JOIN:
3399 case NETDEV_BONDING_INFO:
3400 break;
3401 default:
3402 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3403 break;
3404 }
3405 return NOTIFY_DONE;
3406 }
3407
3408 static struct notifier_block rtnetlink_dev_notifier = {
3409 .notifier_call = rtnetlink_event,
3410 };
3411
3412
3413 static int __net_init rtnetlink_net_init(struct net *net)
3414 {
3415 struct sock *sk;
3416 struct netlink_kernel_cfg cfg = {
3417 .groups = RTNLGRP_MAX,
3418 .input = rtnetlink_rcv,
3419 .cb_mutex = &rtnl_mutex,
3420 .flags = NL_CFG_F_NONROOT_RECV,
3421 };
3422
3423 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3424 if (!sk)
3425 return -ENOMEM;
3426 net->rtnl = sk;
3427 return 0;
3428 }
3429
3430 static void __net_exit rtnetlink_net_exit(struct net *net)
3431 {
3432 netlink_kernel_release(net->rtnl);
3433 net->rtnl = NULL;
3434 }
3435
3436 static struct pernet_operations rtnetlink_net_ops = {
3437 .init = rtnetlink_net_init,
3438 .exit = rtnetlink_net_exit,
3439 };
3440
3441 void __init rtnetlink_init(void)
3442 {
3443 if (register_pernet_subsys(&rtnetlink_net_ops))
3444 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3445
3446 register_netdevice_notifier(&rtnetlink_dev_notifier);
3447
3448 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3449 rtnl_dump_ifinfo, rtnl_calcit);
3450 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3451 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3452 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3453
3454 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3455 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3456
3457 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3458 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3459 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3460
3461 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3462 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3463 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3464 }
Linux kernel - Deliverables
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