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