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Merge tag 'upstream-3.18-rc1-v2' of git://git.infradead.org/linux-ubifs
[mirror_ubuntu-artful-kernel.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/if_bridge.h>
39 #include <linux/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 nla_total_size(sizeof(struct ifla_vf_link_state)));
809 return size;
810 } else
811 return 0;
812 }
813
814 static size_t rtnl_port_size(const struct net_device *dev,
815 u32 ext_filter_mask)
816 {
817 size_t port_size = nla_total_size(4) /* PORT_VF */
818 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
819 + nla_total_size(sizeof(struct ifla_port_vsi))
820 /* PORT_VSI_TYPE */
821 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
822 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
823 + nla_total_size(1) /* PROT_VDP_REQUEST */
824 + nla_total_size(2); /* PORT_VDP_RESPONSE */
825 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
826 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
827 + port_size;
828 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
829 + port_size;
830
831 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
832 !(ext_filter_mask & RTEXT_FILTER_VF))
833 return 0;
834 if (dev_num_vf(dev->dev.parent))
835 return port_self_size + vf_ports_size +
836 vf_port_size * dev_num_vf(dev->dev.parent);
837 else
838 return port_self_size;
839 }
840
841 static noinline size_t if_nlmsg_size(const struct net_device *dev,
842 u32 ext_filter_mask)
843 {
844 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
845 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
846 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
847 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
848 + nla_total_size(sizeof(struct rtnl_link_ifmap))
849 + nla_total_size(sizeof(struct rtnl_link_stats))
850 + nla_total_size(sizeof(struct rtnl_link_stats64))
851 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
852 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
853 + nla_total_size(4) /* IFLA_TXQLEN */
854 + nla_total_size(4) /* IFLA_WEIGHT */
855 + nla_total_size(4) /* IFLA_MTU */
856 + nla_total_size(4) /* IFLA_LINK */
857 + nla_total_size(4) /* IFLA_MASTER */
858 + nla_total_size(1) /* IFLA_CARRIER */
859 + nla_total_size(4) /* IFLA_PROMISCUITY */
860 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
861 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
862 + nla_total_size(1) /* IFLA_OPERSTATE */
863 + nla_total_size(1) /* IFLA_LINKMODE */
864 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
865 + nla_total_size(ext_filter_mask
866 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
867 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
868 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
869 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
870 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
871 + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */
872 }
873
874 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
875 {
876 struct nlattr *vf_ports;
877 struct nlattr *vf_port;
878 int vf;
879 int err;
880
881 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
882 if (!vf_ports)
883 return -EMSGSIZE;
884
885 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
886 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
887 if (!vf_port)
888 goto nla_put_failure;
889 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
890 goto nla_put_failure;
891 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
892 if (err == -EMSGSIZE)
893 goto nla_put_failure;
894 if (err) {
895 nla_nest_cancel(skb, vf_port);
896 continue;
897 }
898 nla_nest_end(skb, vf_port);
899 }
900
901 nla_nest_end(skb, vf_ports);
902
903 return 0;
904
905 nla_put_failure:
906 nla_nest_cancel(skb, vf_ports);
907 return -EMSGSIZE;
908 }
909
910 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
911 {
912 struct nlattr *port_self;
913 int err;
914
915 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
916 if (!port_self)
917 return -EMSGSIZE;
918
919 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
920 if (err) {
921 nla_nest_cancel(skb, port_self);
922 return (err == -EMSGSIZE) ? err : 0;
923 }
924
925 nla_nest_end(skb, port_self);
926
927 return 0;
928 }
929
930 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
931 u32 ext_filter_mask)
932 {
933 int err;
934
935 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
936 !(ext_filter_mask & RTEXT_FILTER_VF))
937 return 0;
938
939 err = rtnl_port_self_fill(skb, dev);
940 if (err)
941 return err;
942
943 if (dev_num_vf(dev->dev.parent)) {
944 err = rtnl_vf_ports_fill(skb, dev);
945 if (err)
946 return err;
947 }
948
949 return 0;
950 }
951
952 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
953 {
954 int err;
955 struct netdev_phys_port_id ppid;
956
957 err = dev_get_phys_port_id(dev, &ppid);
958 if (err) {
959 if (err == -EOPNOTSUPP)
960 return 0;
961 return err;
962 }
963
964 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
965 return -EMSGSIZE;
966
967 return 0;
968 }
969
970 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
971 int type, u32 pid, u32 seq, u32 change,
972 unsigned int flags, u32 ext_filter_mask)
973 {
974 struct ifinfomsg *ifm;
975 struct nlmsghdr *nlh;
976 struct rtnl_link_stats64 temp;
977 const struct rtnl_link_stats64 *stats;
978 struct nlattr *attr, *af_spec;
979 struct rtnl_af_ops *af_ops;
980 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
981
982 ASSERT_RTNL();
983 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
984 if (nlh == NULL)
985 return -EMSGSIZE;
986
987 ifm = nlmsg_data(nlh);
988 ifm->ifi_family = AF_UNSPEC;
989 ifm->__ifi_pad = 0;
990 ifm->ifi_type = dev->type;
991 ifm->ifi_index = dev->ifindex;
992 ifm->ifi_flags = dev_get_flags(dev);
993 ifm->ifi_change = change;
994
995 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
996 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
997 nla_put_u8(skb, IFLA_OPERSTATE,
998 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
999 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1000 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1001 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1002 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1003 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1004 #ifdef CONFIG_RPS
1005 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1006 #endif
1007 (dev->ifindex != dev->iflink &&
1008 nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
1009 (upper_dev &&
1010 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1011 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1012 (dev->qdisc &&
1013 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1014 (dev->ifalias &&
1015 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1016 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1017 atomic_read(&dev->carrier_changes)))
1018 goto nla_put_failure;
1019
1020 if (1) {
1021 struct rtnl_link_ifmap map = {
1022 .mem_start = dev->mem_start,
1023 .mem_end = dev->mem_end,
1024 .base_addr = dev->base_addr,
1025 .irq = dev->irq,
1026 .dma = dev->dma,
1027 .port = dev->if_port,
1028 };
1029 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1030 goto nla_put_failure;
1031 }
1032
1033 if (dev->addr_len) {
1034 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1035 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1036 goto nla_put_failure;
1037 }
1038
1039 if (rtnl_phys_port_id_fill(skb, dev))
1040 goto nla_put_failure;
1041
1042 attr = nla_reserve(skb, IFLA_STATS,
1043 sizeof(struct rtnl_link_stats));
1044 if (attr == NULL)
1045 goto nla_put_failure;
1046
1047 stats = dev_get_stats(dev, &temp);
1048 copy_rtnl_link_stats(nla_data(attr), stats);
1049
1050 attr = nla_reserve(skb, IFLA_STATS64,
1051 sizeof(struct rtnl_link_stats64));
1052 if (attr == NULL)
1053 goto nla_put_failure;
1054 copy_rtnl_link_stats64(nla_data(attr), stats);
1055
1056 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1057 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1058 goto nla_put_failure;
1059
1060 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1061 && (ext_filter_mask & RTEXT_FILTER_VF)) {
1062 int i;
1063
1064 struct nlattr *vfinfo, *vf;
1065 int num_vfs = dev_num_vf(dev->dev.parent);
1066
1067 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1068 if (!vfinfo)
1069 goto nla_put_failure;
1070 for (i = 0; i < num_vfs; i++) {
1071 struct ifla_vf_info ivi;
1072 struct ifla_vf_mac vf_mac;
1073 struct ifla_vf_vlan vf_vlan;
1074 struct ifla_vf_rate vf_rate;
1075 struct ifla_vf_tx_rate vf_tx_rate;
1076 struct ifla_vf_spoofchk vf_spoofchk;
1077 struct ifla_vf_link_state vf_linkstate;
1078
1079 /*
1080 * Not all SR-IOV capable drivers support the
1081 * spoofcheck query. Preset to -1 so the user
1082 * space tool can detect that the driver didn't
1083 * report anything.
1084 */
1085 ivi.spoofchk = -1;
1086 memset(ivi.mac, 0, sizeof(ivi.mac));
1087 /* The default value for VF link state is "auto"
1088 * IFLA_VF_LINK_STATE_AUTO which equals zero
1089 */
1090 ivi.linkstate = 0;
1091 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1092 break;
1093 vf_mac.vf =
1094 vf_vlan.vf =
1095 vf_rate.vf =
1096 vf_tx_rate.vf =
1097 vf_spoofchk.vf =
1098 vf_linkstate.vf = ivi.vf;
1099
1100 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1101 vf_vlan.vlan = ivi.vlan;
1102 vf_vlan.qos = ivi.qos;
1103 vf_tx_rate.rate = ivi.max_tx_rate;
1104 vf_rate.min_tx_rate = ivi.min_tx_rate;
1105 vf_rate.max_tx_rate = ivi.max_tx_rate;
1106 vf_spoofchk.setting = ivi.spoofchk;
1107 vf_linkstate.link_state = ivi.linkstate;
1108 vf = nla_nest_start(skb, IFLA_VF_INFO);
1109 if (!vf) {
1110 nla_nest_cancel(skb, vfinfo);
1111 goto nla_put_failure;
1112 }
1113 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1114 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1115 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1116 &vf_rate) ||
1117 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1118 &vf_tx_rate) ||
1119 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1120 &vf_spoofchk) ||
1121 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1122 &vf_linkstate))
1123 goto nla_put_failure;
1124 nla_nest_end(skb, vf);
1125 }
1126 nla_nest_end(skb, vfinfo);
1127 }
1128
1129 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1130 goto nla_put_failure;
1131
1132 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1133 if (rtnl_link_fill(skb, dev) < 0)
1134 goto nla_put_failure;
1135 }
1136
1137 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1138 goto nla_put_failure;
1139
1140 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1141 if (af_ops->fill_link_af) {
1142 struct nlattr *af;
1143 int err;
1144
1145 if (!(af = nla_nest_start(skb, af_ops->family)))
1146 goto nla_put_failure;
1147
1148 err = af_ops->fill_link_af(skb, dev);
1149
1150 /*
1151 * Caller may return ENODATA to indicate that there
1152 * was no data to be dumped. This is not an error, it
1153 * means we should trim the attribute header and
1154 * continue.
1155 */
1156 if (err == -ENODATA)
1157 nla_nest_cancel(skb, af);
1158 else if (err < 0)
1159 goto nla_put_failure;
1160
1161 nla_nest_end(skb, af);
1162 }
1163 }
1164
1165 nla_nest_end(skb, af_spec);
1166
1167 return nlmsg_end(skb, nlh);
1168
1169 nla_put_failure:
1170 nlmsg_cancel(skb, nlh);
1171 return -EMSGSIZE;
1172 }
1173
1174 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1175 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1176 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1177 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1178 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1179 [IFLA_MTU] = { .type = NLA_U32 },
1180 [IFLA_LINK] = { .type = NLA_U32 },
1181 [IFLA_MASTER] = { .type = NLA_U32 },
1182 [IFLA_CARRIER] = { .type = NLA_U8 },
1183 [IFLA_TXQLEN] = { .type = NLA_U32 },
1184 [IFLA_WEIGHT] = { .type = NLA_U32 },
1185 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1186 [IFLA_LINKMODE] = { .type = NLA_U8 },
1187 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1188 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1189 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1190 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1191 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1192 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1193 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1194 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1195 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1196 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1197 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1198 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1199 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
1200 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1201 };
1202
1203 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1204 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1205 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1206 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1207 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1208 };
1209
1210 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1211 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1212 };
1213
1214 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1215 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1216 .len = sizeof(struct ifla_vf_mac) },
1217 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1218 .len = sizeof(struct ifla_vf_vlan) },
1219 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1220 .len = sizeof(struct ifla_vf_tx_rate) },
1221 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY,
1222 .len = sizeof(struct ifla_vf_spoofchk) },
1223 [IFLA_VF_RATE] = { .type = NLA_BINARY,
1224 .len = sizeof(struct ifla_vf_rate) },
1225 [IFLA_VF_LINK_STATE] = { .type = NLA_BINARY,
1226 .len = sizeof(struct ifla_vf_link_state) },
1227 };
1228
1229 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1230 [IFLA_PORT_VF] = { .type = NLA_U32 },
1231 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1232 .len = PORT_PROFILE_MAX },
1233 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1234 .len = sizeof(struct ifla_port_vsi)},
1235 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1236 .len = PORT_UUID_MAX },
1237 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1238 .len = PORT_UUID_MAX },
1239 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1240 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1241 };
1242
1243 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1244 {
1245 struct net *net = sock_net(skb->sk);
1246 int h, s_h;
1247 int idx = 0, s_idx;
1248 struct net_device *dev;
1249 struct hlist_head *head;
1250 struct nlattr *tb[IFLA_MAX+1];
1251 u32 ext_filter_mask = 0;
1252 int err;
1253 int hdrlen;
1254
1255 s_h = cb->args[0];
1256 s_idx = cb->args[1];
1257
1258 rcu_read_lock();
1259 cb->seq = net->dev_base_seq;
1260
1261 /* A hack to preserve kernel<->userspace interface.
1262 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1263 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1264 * what iproute2 < v3.9.0 used.
1265 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1266 * attribute, its netlink message is shorter than struct ifinfomsg.
1267 */
1268 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1269 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1270
1271 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1272
1273 if (tb[IFLA_EXT_MASK])
1274 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1275 }
1276
1277 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1278 idx = 0;
1279 head = &net->dev_index_head[h];
1280 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1281 if (idx < s_idx)
1282 goto cont;
1283 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1284 NETLINK_CB(cb->skb).portid,
1285 cb->nlh->nlmsg_seq, 0,
1286 NLM_F_MULTI,
1287 ext_filter_mask);
1288 /* If we ran out of room on the first message,
1289 * we're in trouble
1290 */
1291 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1292
1293 if (err <= 0)
1294 goto out;
1295
1296 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1297 cont:
1298 idx++;
1299 }
1300 }
1301 out:
1302 rcu_read_unlock();
1303 cb->args[1] = idx;
1304 cb->args[0] = h;
1305
1306 return skb->len;
1307 }
1308
1309 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1310 {
1311 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1312 }
1313 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1314
1315 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1316 {
1317 struct net *net;
1318 /* Examine the link attributes and figure out which
1319 * network namespace we are talking about.
1320 */
1321 if (tb[IFLA_NET_NS_PID])
1322 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1323 else if (tb[IFLA_NET_NS_FD])
1324 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1325 else
1326 net = get_net(src_net);
1327 return net;
1328 }
1329 EXPORT_SYMBOL(rtnl_link_get_net);
1330
1331 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1332 {
1333 if (dev) {
1334 if (tb[IFLA_ADDRESS] &&
1335 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1336 return -EINVAL;
1337
1338 if (tb[IFLA_BROADCAST] &&
1339 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1340 return -EINVAL;
1341 }
1342
1343 if (tb[IFLA_AF_SPEC]) {
1344 struct nlattr *af;
1345 int rem, err;
1346
1347 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1348 const struct rtnl_af_ops *af_ops;
1349
1350 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1351 return -EAFNOSUPPORT;
1352
1353 if (!af_ops->set_link_af)
1354 return -EOPNOTSUPP;
1355
1356 if (af_ops->validate_link_af) {
1357 err = af_ops->validate_link_af(dev, af);
1358 if (err < 0)
1359 return err;
1360 }
1361 }
1362 }
1363
1364 return 0;
1365 }
1366
1367 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1368 {
1369 int rem, err = -EINVAL;
1370 struct nlattr *vf;
1371 const struct net_device_ops *ops = dev->netdev_ops;
1372
1373 nla_for_each_nested(vf, attr, rem) {
1374 switch (nla_type(vf)) {
1375 case IFLA_VF_MAC: {
1376 struct ifla_vf_mac *ivm;
1377 ivm = nla_data(vf);
1378 err = -EOPNOTSUPP;
1379 if (ops->ndo_set_vf_mac)
1380 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1381 ivm->mac);
1382 break;
1383 }
1384 case IFLA_VF_VLAN: {
1385 struct ifla_vf_vlan *ivv;
1386 ivv = nla_data(vf);
1387 err = -EOPNOTSUPP;
1388 if (ops->ndo_set_vf_vlan)
1389 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1390 ivv->vlan,
1391 ivv->qos);
1392 break;
1393 }
1394 case IFLA_VF_TX_RATE: {
1395 struct ifla_vf_tx_rate *ivt;
1396 struct ifla_vf_info ivf;
1397 ivt = nla_data(vf);
1398 err = -EOPNOTSUPP;
1399 if (ops->ndo_get_vf_config)
1400 err = ops->ndo_get_vf_config(dev, ivt->vf,
1401 &ivf);
1402 if (err)
1403 break;
1404 err = -EOPNOTSUPP;
1405 if (ops->ndo_set_vf_rate)
1406 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1407 ivf.min_tx_rate,
1408 ivt->rate);
1409 break;
1410 }
1411 case IFLA_VF_RATE: {
1412 struct ifla_vf_rate *ivt;
1413 ivt = nla_data(vf);
1414 err = -EOPNOTSUPP;
1415 if (ops->ndo_set_vf_rate)
1416 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1417 ivt->min_tx_rate,
1418 ivt->max_tx_rate);
1419 break;
1420 }
1421 case IFLA_VF_SPOOFCHK: {
1422 struct ifla_vf_spoofchk *ivs;
1423 ivs = nla_data(vf);
1424 err = -EOPNOTSUPP;
1425 if (ops->ndo_set_vf_spoofchk)
1426 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1427 ivs->setting);
1428 break;
1429 }
1430 case IFLA_VF_LINK_STATE: {
1431 struct ifla_vf_link_state *ivl;
1432 ivl = nla_data(vf);
1433 err = -EOPNOTSUPP;
1434 if (ops->ndo_set_vf_link_state)
1435 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1436 ivl->link_state);
1437 break;
1438 }
1439 default:
1440 err = -EINVAL;
1441 break;
1442 }
1443 if (err)
1444 break;
1445 }
1446 return err;
1447 }
1448
1449 static int do_set_master(struct net_device *dev, int ifindex)
1450 {
1451 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1452 const struct net_device_ops *ops;
1453 int err;
1454
1455 if (upper_dev) {
1456 if (upper_dev->ifindex == ifindex)
1457 return 0;
1458 ops = upper_dev->netdev_ops;
1459 if (ops->ndo_del_slave) {
1460 err = ops->ndo_del_slave(upper_dev, dev);
1461 if (err)
1462 return err;
1463 } else {
1464 return -EOPNOTSUPP;
1465 }
1466 }
1467
1468 if (ifindex) {
1469 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1470 if (!upper_dev)
1471 return -EINVAL;
1472 ops = upper_dev->netdev_ops;
1473 if (ops->ndo_add_slave) {
1474 err = ops->ndo_add_slave(upper_dev, dev);
1475 if (err)
1476 return err;
1477 } else {
1478 return -EOPNOTSUPP;
1479 }
1480 }
1481 return 0;
1482 }
1483
1484 #define DO_SETLINK_MODIFIED 0x01
1485 /* notify flag means notify + modified. */
1486 #define DO_SETLINK_NOTIFY 0x03
1487 static int do_setlink(const struct sk_buff *skb,
1488 struct net_device *dev, struct ifinfomsg *ifm,
1489 struct nlattr **tb, char *ifname, int status)
1490 {
1491 const struct net_device_ops *ops = dev->netdev_ops;
1492 int err;
1493
1494 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1495 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1496 if (IS_ERR(net)) {
1497 err = PTR_ERR(net);
1498 goto errout;
1499 }
1500 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1501 err = -EPERM;
1502 goto errout;
1503 }
1504 err = dev_change_net_namespace(dev, net, ifname);
1505 put_net(net);
1506 if (err)
1507 goto errout;
1508 status |= DO_SETLINK_MODIFIED;
1509 }
1510
1511 if (tb[IFLA_MAP]) {
1512 struct rtnl_link_ifmap *u_map;
1513 struct ifmap k_map;
1514
1515 if (!ops->ndo_set_config) {
1516 err = -EOPNOTSUPP;
1517 goto errout;
1518 }
1519
1520 if (!netif_device_present(dev)) {
1521 err = -ENODEV;
1522 goto errout;
1523 }
1524
1525 u_map = nla_data(tb[IFLA_MAP]);
1526 k_map.mem_start = (unsigned long) u_map->mem_start;
1527 k_map.mem_end = (unsigned long) u_map->mem_end;
1528 k_map.base_addr = (unsigned short) u_map->base_addr;
1529 k_map.irq = (unsigned char) u_map->irq;
1530 k_map.dma = (unsigned char) u_map->dma;
1531 k_map.port = (unsigned char) u_map->port;
1532
1533 err = ops->ndo_set_config(dev, &k_map);
1534 if (err < 0)
1535 goto errout;
1536
1537 status |= DO_SETLINK_NOTIFY;
1538 }
1539
1540 if (tb[IFLA_ADDRESS]) {
1541 struct sockaddr *sa;
1542 int len;
1543
1544 len = sizeof(sa_family_t) + dev->addr_len;
1545 sa = kmalloc(len, GFP_KERNEL);
1546 if (!sa) {
1547 err = -ENOMEM;
1548 goto errout;
1549 }
1550 sa->sa_family = dev->type;
1551 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1552 dev->addr_len);
1553 err = dev_set_mac_address(dev, sa);
1554 kfree(sa);
1555 if (err)
1556 goto errout;
1557 status |= DO_SETLINK_MODIFIED;
1558 }
1559
1560 if (tb[IFLA_MTU]) {
1561 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1562 if (err < 0)
1563 goto errout;
1564 status |= DO_SETLINK_MODIFIED;
1565 }
1566
1567 if (tb[IFLA_GROUP]) {
1568 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1569 status |= DO_SETLINK_NOTIFY;
1570 }
1571
1572 /*
1573 * Interface selected by interface index but interface
1574 * name provided implies that a name change has been
1575 * requested.
1576 */
1577 if (ifm->ifi_index > 0 && ifname[0]) {
1578 err = dev_change_name(dev, ifname);
1579 if (err < 0)
1580 goto errout;
1581 status |= DO_SETLINK_MODIFIED;
1582 }
1583
1584 if (tb[IFLA_IFALIAS]) {
1585 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1586 nla_len(tb[IFLA_IFALIAS]));
1587 if (err < 0)
1588 goto errout;
1589 status |= DO_SETLINK_NOTIFY;
1590 }
1591
1592 if (tb[IFLA_BROADCAST]) {
1593 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1594 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1595 }
1596
1597 if (ifm->ifi_flags || ifm->ifi_change) {
1598 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1599 if (err < 0)
1600 goto errout;
1601 }
1602
1603 if (tb[IFLA_MASTER]) {
1604 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1605 if (err)
1606 goto errout;
1607 status |= DO_SETLINK_MODIFIED;
1608 }
1609
1610 if (tb[IFLA_CARRIER]) {
1611 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1612 if (err)
1613 goto errout;
1614 status |= DO_SETLINK_MODIFIED;
1615 }
1616
1617 if (tb[IFLA_TXQLEN]) {
1618 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1619
1620 if (dev->tx_queue_len ^ value)
1621 status |= DO_SETLINK_NOTIFY;
1622
1623 dev->tx_queue_len = value;
1624 }
1625
1626 if (tb[IFLA_OPERSTATE])
1627 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1628
1629 if (tb[IFLA_LINKMODE]) {
1630 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1631
1632 write_lock_bh(&dev_base_lock);
1633 if (dev->link_mode ^ value)
1634 status |= DO_SETLINK_NOTIFY;
1635 dev->link_mode = value;
1636 write_unlock_bh(&dev_base_lock);
1637 }
1638
1639 if (tb[IFLA_VFINFO_LIST]) {
1640 struct nlattr *attr;
1641 int rem;
1642 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1643 if (nla_type(attr) != IFLA_VF_INFO) {
1644 err = -EINVAL;
1645 goto errout;
1646 }
1647 err = do_setvfinfo(dev, attr);
1648 if (err < 0)
1649 goto errout;
1650 status |= DO_SETLINK_NOTIFY;
1651 }
1652 }
1653 err = 0;
1654
1655 if (tb[IFLA_VF_PORTS]) {
1656 struct nlattr *port[IFLA_PORT_MAX+1];
1657 struct nlattr *attr;
1658 int vf;
1659 int rem;
1660
1661 err = -EOPNOTSUPP;
1662 if (!ops->ndo_set_vf_port)
1663 goto errout;
1664
1665 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1666 if (nla_type(attr) != IFLA_VF_PORT)
1667 continue;
1668 err = nla_parse_nested(port, IFLA_PORT_MAX,
1669 attr, ifla_port_policy);
1670 if (err < 0)
1671 goto errout;
1672 if (!port[IFLA_PORT_VF]) {
1673 err = -EOPNOTSUPP;
1674 goto errout;
1675 }
1676 vf = nla_get_u32(port[IFLA_PORT_VF]);
1677 err = ops->ndo_set_vf_port(dev, vf, port);
1678 if (err < 0)
1679 goto errout;
1680 status |= DO_SETLINK_NOTIFY;
1681 }
1682 }
1683 err = 0;
1684
1685 if (tb[IFLA_PORT_SELF]) {
1686 struct nlattr *port[IFLA_PORT_MAX+1];
1687
1688 err = nla_parse_nested(port, IFLA_PORT_MAX,
1689 tb[IFLA_PORT_SELF], ifla_port_policy);
1690 if (err < 0)
1691 goto errout;
1692
1693 err = -EOPNOTSUPP;
1694 if (ops->ndo_set_vf_port)
1695 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1696 if (err < 0)
1697 goto errout;
1698 status |= DO_SETLINK_NOTIFY;
1699 }
1700
1701 if (tb[IFLA_AF_SPEC]) {
1702 struct nlattr *af;
1703 int rem;
1704
1705 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1706 const struct rtnl_af_ops *af_ops;
1707
1708 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1709 BUG();
1710
1711 err = af_ops->set_link_af(dev, af);
1712 if (err < 0)
1713 goto errout;
1714
1715 status |= DO_SETLINK_NOTIFY;
1716 }
1717 }
1718 err = 0;
1719
1720 errout:
1721 if (status & DO_SETLINK_MODIFIED) {
1722 if (status & DO_SETLINK_NOTIFY)
1723 netdev_state_change(dev);
1724
1725 if (err < 0)
1726 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",
1727 dev->name);
1728 }
1729
1730 return err;
1731 }
1732
1733 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1734 {
1735 struct net *net = sock_net(skb->sk);
1736 struct ifinfomsg *ifm;
1737 struct net_device *dev;
1738 int err;
1739 struct nlattr *tb[IFLA_MAX+1];
1740 char ifname[IFNAMSIZ];
1741
1742 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1743 if (err < 0)
1744 goto errout;
1745
1746 if (tb[IFLA_IFNAME])
1747 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1748 else
1749 ifname[0] = '\0';
1750
1751 err = -EINVAL;
1752 ifm = nlmsg_data(nlh);
1753 if (ifm->ifi_index > 0)
1754 dev = __dev_get_by_index(net, ifm->ifi_index);
1755 else if (tb[IFLA_IFNAME])
1756 dev = __dev_get_by_name(net, ifname);
1757 else
1758 goto errout;
1759
1760 if (dev == NULL) {
1761 err = -ENODEV;
1762 goto errout;
1763 }
1764
1765 err = validate_linkmsg(dev, tb);
1766 if (err < 0)
1767 goto errout;
1768
1769 err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1770 errout:
1771 return err;
1772 }
1773
1774 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1775 {
1776 struct net *net = sock_net(skb->sk);
1777 const struct rtnl_link_ops *ops;
1778 struct net_device *dev;
1779 struct ifinfomsg *ifm;
1780 char ifname[IFNAMSIZ];
1781 struct nlattr *tb[IFLA_MAX+1];
1782 int err;
1783 LIST_HEAD(list_kill);
1784
1785 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1786 if (err < 0)
1787 return err;
1788
1789 if (tb[IFLA_IFNAME])
1790 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1791
1792 ifm = nlmsg_data(nlh);
1793 if (ifm->ifi_index > 0)
1794 dev = __dev_get_by_index(net, ifm->ifi_index);
1795 else if (tb[IFLA_IFNAME])
1796 dev = __dev_get_by_name(net, ifname);
1797 else
1798 return -EINVAL;
1799
1800 if (!dev)
1801 return -ENODEV;
1802
1803 ops = dev->rtnl_link_ops;
1804 if (!ops || !ops->dellink)
1805 return -EOPNOTSUPP;
1806
1807 ops->dellink(dev, &list_kill);
1808 unregister_netdevice_many(&list_kill);
1809 return 0;
1810 }
1811
1812 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1813 {
1814 unsigned int old_flags;
1815 int err;
1816
1817 old_flags = dev->flags;
1818 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1819 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1820 if (err < 0)
1821 return err;
1822 }
1823
1824 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1825
1826 __dev_notify_flags(dev, old_flags, ~0U);
1827 return 0;
1828 }
1829 EXPORT_SYMBOL(rtnl_configure_link);
1830
1831 struct net_device *rtnl_create_link(struct net *net,
1832 char *ifname, unsigned char name_assign_type,
1833 const struct rtnl_link_ops *ops, struct nlattr *tb[])
1834 {
1835 int err;
1836 struct net_device *dev;
1837 unsigned int num_tx_queues = 1;
1838 unsigned int num_rx_queues = 1;
1839
1840 if (tb[IFLA_NUM_TX_QUEUES])
1841 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1842 else if (ops->get_num_tx_queues)
1843 num_tx_queues = ops->get_num_tx_queues();
1844
1845 if (tb[IFLA_NUM_RX_QUEUES])
1846 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1847 else if (ops->get_num_rx_queues)
1848 num_rx_queues = ops->get_num_rx_queues();
1849
1850 err = -ENOMEM;
1851 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
1852 ops->setup, num_tx_queues, num_rx_queues);
1853 if (!dev)
1854 goto err;
1855
1856 dev_net_set(dev, net);
1857 dev->rtnl_link_ops = ops;
1858 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1859
1860 if (tb[IFLA_MTU])
1861 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1862 if (tb[IFLA_ADDRESS]) {
1863 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1864 nla_len(tb[IFLA_ADDRESS]));
1865 dev->addr_assign_type = NET_ADDR_SET;
1866 }
1867 if (tb[IFLA_BROADCAST])
1868 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1869 nla_len(tb[IFLA_BROADCAST]));
1870 if (tb[IFLA_TXQLEN])
1871 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1872 if (tb[IFLA_OPERSTATE])
1873 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1874 if (tb[IFLA_LINKMODE])
1875 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1876 if (tb[IFLA_GROUP])
1877 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1878
1879 return dev;
1880
1881 err:
1882 return ERR_PTR(err);
1883 }
1884 EXPORT_SYMBOL(rtnl_create_link);
1885
1886 static int rtnl_group_changelink(const struct sk_buff *skb,
1887 struct net *net, int group,
1888 struct ifinfomsg *ifm,
1889 struct nlattr **tb)
1890 {
1891 struct net_device *dev;
1892 int err;
1893
1894 for_each_netdev(net, dev) {
1895 if (dev->group == group) {
1896 err = do_setlink(skb, dev, ifm, tb, NULL, 0);
1897 if (err < 0)
1898 return err;
1899 }
1900 }
1901
1902 return 0;
1903 }
1904
1905 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1906 {
1907 struct net *net = sock_net(skb->sk);
1908 const struct rtnl_link_ops *ops;
1909 const struct rtnl_link_ops *m_ops = NULL;
1910 struct net_device *dev;
1911 struct net_device *master_dev = NULL;
1912 struct ifinfomsg *ifm;
1913 char kind[MODULE_NAME_LEN];
1914 char ifname[IFNAMSIZ];
1915 struct nlattr *tb[IFLA_MAX+1];
1916 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1917 unsigned char name_assign_type = NET_NAME_USER;
1918 int err;
1919
1920 #ifdef CONFIG_MODULES
1921 replay:
1922 #endif
1923 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1924 if (err < 0)
1925 return err;
1926
1927 if (tb[IFLA_IFNAME])
1928 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1929 else
1930 ifname[0] = '\0';
1931
1932 ifm = nlmsg_data(nlh);
1933 if (ifm->ifi_index > 0)
1934 dev = __dev_get_by_index(net, ifm->ifi_index);
1935 else {
1936 if (ifname[0])
1937 dev = __dev_get_by_name(net, ifname);
1938 else
1939 dev = NULL;
1940 }
1941
1942 if (dev) {
1943 master_dev = netdev_master_upper_dev_get(dev);
1944 if (master_dev)
1945 m_ops = master_dev->rtnl_link_ops;
1946 }
1947
1948 err = validate_linkmsg(dev, tb);
1949 if (err < 0)
1950 return err;
1951
1952 if (tb[IFLA_LINKINFO]) {
1953 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1954 tb[IFLA_LINKINFO], ifla_info_policy);
1955 if (err < 0)
1956 return err;
1957 } else
1958 memset(linkinfo, 0, sizeof(linkinfo));
1959
1960 if (linkinfo[IFLA_INFO_KIND]) {
1961 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1962 ops = rtnl_link_ops_get(kind);
1963 } else {
1964 kind[0] = '\0';
1965 ops = NULL;
1966 }
1967
1968 if (1) {
1969 struct nlattr *attr[ops ? ops->maxtype + 1 : 0];
1970 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 0];
1971 struct nlattr **data = NULL;
1972 struct nlattr **slave_data = NULL;
1973 struct net *dest_net;
1974
1975 if (ops) {
1976 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1977 err = nla_parse_nested(attr, ops->maxtype,
1978 linkinfo[IFLA_INFO_DATA],
1979 ops->policy);
1980 if (err < 0)
1981 return err;
1982 data = attr;
1983 }
1984 if (ops->validate) {
1985 err = ops->validate(tb, data);
1986 if (err < 0)
1987 return err;
1988 }
1989 }
1990
1991 if (m_ops) {
1992 if (m_ops->slave_maxtype &&
1993 linkinfo[IFLA_INFO_SLAVE_DATA]) {
1994 err = nla_parse_nested(slave_attr,
1995 m_ops->slave_maxtype,
1996 linkinfo[IFLA_INFO_SLAVE_DATA],
1997 m_ops->slave_policy);
1998 if (err < 0)
1999 return err;
2000 slave_data = slave_attr;
2001 }
2002 if (m_ops->slave_validate) {
2003 err = m_ops->slave_validate(tb, slave_data);
2004 if (err < 0)
2005 return err;
2006 }
2007 }
2008
2009 if (dev) {
2010 int status = 0;
2011
2012 if (nlh->nlmsg_flags & NLM_F_EXCL)
2013 return -EEXIST;
2014 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2015 return -EOPNOTSUPP;
2016
2017 if (linkinfo[IFLA_INFO_DATA]) {
2018 if (!ops || ops != dev->rtnl_link_ops ||
2019 !ops->changelink)
2020 return -EOPNOTSUPP;
2021
2022 err = ops->changelink(dev, tb, data);
2023 if (err < 0)
2024 return err;
2025 status |= DO_SETLINK_NOTIFY;
2026 }
2027
2028 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2029 if (!m_ops || !m_ops->slave_changelink)
2030 return -EOPNOTSUPP;
2031
2032 err = m_ops->slave_changelink(master_dev, dev,
2033 tb, slave_data);
2034 if (err < 0)
2035 return err;
2036 status |= DO_SETLINK_NOTIFY;
2037 }
2038
2039 return do_setlink(skb, dev, ifm, tb, ifname, status);
2040 }
2041
2042 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2043 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2044 return rtnl_group_changelink(skb, net,
2045 nla_get_u32(tb[IFLA_GROUP]),
2046 ifm, tb);
2047 return -ENODEV;
2048 }
2049
2050 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2051 return -EOPNOTSUPP;
2052
2053 if (!ops) {
2054 #ifdef CONFIG_MODULES
2055 if (kind[0]) {
2056 __rtnl_unlock();
2057 request_module("rtnl-link-%s", kind);
2058 rtnl_lock();
2059 ops = rtnl_link_ops_get(kind);
2060 if (ops)
2061 goto replay;
2062 }
2063 #endif
2064 return -EOPNOTSUPP;
2065 }
2066
2067 if (!ops->setup)
2068 return -EOPNOTSUPP;
2069
2070 if (!ifname[0]) {
2071 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2072 name_assign_type = NET_NAME_ENUM;
2073 }
2074
2075 dest_net = rtnl_link_get_net(net, tb);
2076 if (IS_ERR(dest_net))
2077 return PTR_ERR(dest_net);
2078
2079 dev = rtnl_create_link(dest_net, ifname, name_assign_type, ops, tb);
2080 if (IS_ERR(dev)) {
2081 err = PTR_ERR(dev);
2082 goto out;
2083 }
2084
2085 dev->ifindex = ifm->ifi_index;
2086
2087 if (ops->newlink) {
2088 err = ops->newlink(net, dev, tb, data);
2089 /* Drivers should call free_netdev() in ->destructor
2090 * and unregister it on failure after registration
2091 * so that device could be finally freed in rtnl_unlock.
2092 */
2093 if (err < 0) {
2094 /* If device is not registered at all, free it now */
2095 if (dev->reg_state == NETREG_UNINITIALIZED)
2096 free_netdev(dev);
2097 goto out;
2098 }
2099 } else {
2100 err = register_netdevice(dev);
2101 if (err < 0) {
2102 free_netdev(dev);
2103 goto out;
2104 }
2105 }
2106 err = rtnl_configure_link(dev, ifm);
2107 if (err < 0)
2108 unregister_netdevice(dev);
2109 out:
2110 put_net(dest_net);
2111 return err;
2112 }
2113 }
2114
2115 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2116 {
2117 struct net *net = sock_net(skb->sk);
2118 struct ifinfomsg *ifm;
2119 char ifname[IFNAMSIZ];
2120 struct nlattr *tb[IFLA_MAX+1];
2121 struct net_device *dev = NULL;
2122 struct sk_buff *nskb;
2123 int err;
2124 u32 ext_filter_mask = 0;
2125
2126 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2127 if (err < 0)
2128 return err;
2129
2130 if (tb[IFLA_IFNAME])
2131 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2132
2133 if (tb[IFLA_EXT_MASK])
2134 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2135
2136 ifm = nlmsg_data(nlh);
2137 if (ifm->ifi_index > 0)
2138 dev = __dev_get_by_index(net, ifm->ifi_index);
2139 else if (tb[IFLA_IFNAME])
2140 dev = __dev_get_by_name(net, ifname);
2141 else
2142 return -EINVAL;
2143
2144 if (dev == NULL)
2145 return -ENODEV;
2146
2147 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2148 if (nskb == NULL)
2149 return -ENOBUFS;
2150
2151 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2152 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2153 if (err < 0) {
2154 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2155 WARN_ON(err == -EMSGSIZE);
2156 kfree_skb(nskb);
2157 } else
2158 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2159
2160 return err;
2161 }
2162
2163 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2164 {
2165 struct net *net = sock_net(skb->sk);
2166 struct net_device *dev;
2167 struct nlattr *tb[IFLA_MAX+1];
2168 u32 ext_filter_mask = 0;
2169 u16 min_ifinfo_dump_size = 0;
2170 int hdrlen;
2171
2172 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2173 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2174 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2175
2176 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2177 if (tb[IFLA_EXT_MASK])
2178 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2179 }
2180
2181 if (!ext_filter_mask)
2182 return NLMSG_GOODSIZE;
2183 /*
2184 * traverse the list of net devices and compute the minimum
2185 * buffer size based upon the filter mask.
2186 */
2187 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2188 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2189 if_nlmsg_size(dev,
2190 ext_filter_mask));
2191 }
2192
2193 return min_ifinfo_dump_size;
2194 }
2195
2196 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2197 {
2198 int idx;
2199 int s_idx = cb->family;
2200
2201 if (s_idx == 0)
2202 s_idx = 1;
2203 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2204 int type = cb->nlh->nlmsg_type-RTM_BASE;
2205 if (idx < s_idx || idx == PF_PACKET)
2206 continue;
2207 if (rtnl_msg_handlers[idx] == NULL ||
2208 rtnl_msg_handlers[idx][type].dumpit == NULL)
2209 continue;
2210 if (idx > s_idx) {
2211 memset(&cb->args[0], 0, sizeof(cb->args));
2212 cb->prev_seq = 0;
2213 cb->seq = 0;
2214 }
2215 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2216 break;
2217 }
2218 cb->family = idx;
2219
2220 return skb->len;
2221 }
2222
2223 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2224 gfp_t flags)
2225 {
2226 struct net *net = dev_net(dev);
2227 struct sk_buff *skb;
2228 int err = -ENOBUFS;
2229 size_t if_info_size;
2230
2231 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2232 if (skb == NULL)
2233 goto errout;
2234
2235 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2236 if (err < 0) {
2237 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2238 WARN_ON(err == -EMSGSIZE);
2239 kfree_skb(skb);
2240 goto errout;
2241 }
2242 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2243 return;
2244 errout:
2245 if (err < 0)
2246 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2247 }
2248 EXPORT_SYMBOL(rtmsg_ifinfo);
2249
2250 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2251 struct net_device *dev,
2252 u8 *addr, u32 pid, u32 seq,
2253 int type, unsigned int flags,
2254 int nlflags)
2255 {
2256 struct nlmsghdr *nlh;
2257 struct ndmsg *ndm;
2258
2259 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2260 if (!nlh)
2261 return -EMSGSIZE;
2262
2263 ndm = nlmsg_data(nlh);
2264 ndm->ndm_family = AF_BRIDGE;
2265 ndm->ndm_pad1 = 0;
2266 ndm->ndm_pad2 = 0;
2267 ndm->ndm_flags = flags;
2268 ndm->ndm_type = 0;
2269 ndm->ndm_ifindex = dev->ifindex;
2270 ndm->ndm_state = NUD_PERMANENT;
2271
2272 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2273 goto nla_put_failure;
2274
2275 return nlmsg_end(skb, nlh);
2276
2277 nla_put_failure:
2278 nlmsg_cancel(skb, nlh);
2279 return -EMSGSIZE;
2280 }
2281
2282 static inline size_t rtnl_fdb_nlmsg_size(void)
2283 {
2284 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2285 }
2286
2287 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2288 {
2289 struct net *net = dev_net(dev);
2290 struct sk_buff *skb;
2291 int err = -ENOBUFS;
2292
2293 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2294 if (!skb)
2295 goto errout;
2296
2297 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0);
2298 if (err < 0) {
2299 kfree_skb(skb);
2300 goto errout;
2301 }
2302
2303 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2304 return;
2305 errout:
2306 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2307 }
2308
2309 /**
2310 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2311 */
2312 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2313 struct nlattr *tb[],
2314 struct net_device *dev,
2315 const unsigned char *addr,
2316 u16 flags)
2317 {
2318 int err = -EINVAL;
2319
2320 /* If aging addresses are supported device will need to
2321 * implement its own handler for this.
2322 */
2323 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2324 pr_info("%s: FDB only supports static addresses\n", dev->name);
2325 return err;
2326 }
2327
2328 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2329 err = dev_uc_add_excl(dev, addr);
2330 else if (is_multicast_ether_addr(addr))
2331 err = dev_mc_add_excl(dev, addr);
2332
2333 /* Only return duplicate errors if NLM_F_EXCL is set */
2334 if (err == -EEXIST && !(flags & NLM_F_EXCL))
2335 err = 0;
2336
2337 return err;
2338 }
2339 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2340
2341 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2342 {
2343 struct net *net = sock_net(skb->sk);
2344 struct ndmsg *ndm;
2345 struct nlattr *tb[NDA_MAX+1];
2346 struct net_device *dev;
2347 u8 *addr;
2348 int err;
2349
2350 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2351 if (err < 0)
2352 return err;
2353
2354 ndm = nlmsg_data(nlh);
2355 if (ndm->ndm_ifindex == 0) {
2356 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2357 return -EINVAL;
2358 }
2359
2360 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2361 if (dev == NULL) {
2362 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2363 return -ENODEV;
2364 }
2365
2366 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2367 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2368 return -EINVAL;
2369 }
2370
2371 addr = nla_data(tb[NDA_LLADDR]);
2372
2373 err = -EOPNOTSUPP;
2374
2375 /* Support fdb on master device the net/bridge default case */
2376 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2377 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2378 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2379 const struct net_device_ops *ops = br_dev->netdev_ops;
2380
2381 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2382 if (err)
2383 goto out;
2384 else
2385 ndm->ndm_flags &= ~NTF_MASTER;
2386 }
2387
2388 /* Embedded bridge, macvlan, and any other device support */
2389 if ((ndm->ndm_flags & NTF_SELF)) {
2390 if (dev->netdev_ops->ndo_fdb_add)
2391 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2392 nlh->nlmsg_flags);
2393 else
2394 err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2395 nlh->nlmsg_flags);
2396
2397 if (!err) {
2398 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2399 ndm->ndm_flags &= ~NTF_SELF;
2400 }
2401 }
2402 out:
2403 return err;
2404 }
2405
2406 /**
2407 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2408 */
2409 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2410 struct nlattr *tb[],
2411 struct net_device *dev,
2412 const unsigned char *addr)
2413 {
2414 int err = -EINVAL;
2415
2416 /* If aging addresses are supported device will need to
2417 * implement its own handler for this.
2418 */
2419 if (!(ndm->ndm_state & NUD_PERMANENT)) {
2420 pr_info("%s: FDB only supports static addresses\n", dev->name);
2421 return err;
2422 }
2423
2424 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2425 err = dev_uc_del(dev, addr);
2426 else if (is_multicast_ether_addr(addr))
2427 err = dev_mc_del(dev, addr);
2428
2429 return err;
2430 }
2431 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2432
2433 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2434 {
2435 struct net *net = sock_net(skb->sk);
2436 struct ndmsg *ndm;
2437 struct nlattr *tb[NDA_MAX+1];
2438 struct net_device *dev;
2439 int err = -EINVAL;
2440 __u8 *addr;
2441
2442 if (!netlink_capable(skb, CAP_NET_ADMIN))
2443 return -EPERM;
2444
2445 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2446 if (err < 0)
2447 return err;
2448
2449 ndm = nlmsg_data(nlh);
2450 if (ndm->ndm_ifindex == 0) {
2451 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2452 return -EINVAL;
2453 }
2454
2455 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2456 if (dev == NULL) {
2457 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2458 return -ENODEV;
2459 }
2460
2461 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2462 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2463 return -EINVAL;
2464 }
2465
2466 addr = nla_data(tb[NDA_LLADDR]);
2467
2468 err = -EOPNOTSUPP;
2469
2470 /* Support fdb on master device the net/bridge default case */
2471 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2472 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2473 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2474 const struct net_device_ops *ops = br_dev->netdev_ops;
2475
2476 if (ops->ndo_fdb_del)
2477 err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2478
2479 if (err)
2480 goto out;
2481 else
2482 ndm->ndm_flags &= ~NTF_MASTER;
2483 }
2484
2485 /* Embedded bridge, macvlan, and any other device support */
2486 if (ndm->ndm_flags & NTF_SELF) {
2487 if (dev->netdev_ops->ndo_fdb_del)
2488 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2489 else
2490 err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2491
2492 if (!err) {
2493 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2494 ndm->ndm_flags &= ~NTF_SELF;
2495 }
2496 }
2497 out:
2498 return err;
2499 }
2500
2501 static int nlmsg_populate_fdb(struct sk_buff *skb,
2502 struct netlink_callback *cb,
2503 struct net_device *dev,
2504 int *idx,
2505 struct netdev_hw_addr_list *list)
2506 {
2507 struct netdev_hw_addr *ha;
2508 int err;
2509 u32 portid, seq;
2510
2511 portid = NETLINK_CB(cb->skb).portid;
2512 seq = cb->nlh->nlmsg_seq;
2513
2514 list_for_each_entry(ha, &list->list, list) {
2515 if (*idx < cb->args[0])
2516 goto skip;
2517
2518 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2519 portid, seq,
2520 RTM_NEWNEIGH, NTF_SELF,
2521 NLM_F_MULTI);
2522 if (err < 0)
2523 return err;
2524 skip:
2525 *idx += 1;
2526 }
2527 return 0;
2528 }
2529
2530 /**
2531 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2532 * @nlh: netlink message header
2533 * @dev: netdevice
2534 *
2535 * Default netdevice operation to dump the existing unicast address list.
2536 * Returns number of addresses from list put in skb.
2537 */
2538 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2539 struct netlink_callback *cb,
2540 struct net_device *dev,
2541 struct net_device *filter_dev,
2542 int idx)
2543 {
2544 int err;
2545
2546 netif_addr_lock_bh(dev);
2547 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2548 if (err)
2549 goto out;
2550 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2551 out:
2552 netif_addr_unlock_bh(dev);
2553 return idx;
2554 }
2555 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2556
2557 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2558 {
2559 struct net_device *dev;
2560 struct nlattr *tb[IFLA_MAX+1];
2561 struct net_device *bdev = NULL;
2562 struct net_device *br_dev = NULL;
2563 const struct net_device_ops *ops = NULL;
2564 const struct net_device_ops *cops = NULL;
2565 struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2566 struct net *net = sock_net(skb->sk);
2567 int brport_idx = 0;
2568 int br_idx = 0;
2569 int idx = 0;
2570
2571 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2572 ifla_policy) == 0) {
2573 if (tb[IFLA_MASTER])
2574 br_idx = nla_get_u32(tb[IFLA_MASTER]);
2575 }
2576
2577 brport_idx = ifm->ifi_index;
2578
2579 if (br_idx) {
2580 br_dev = __dev_get_by_index(net, br_idx);
2581 if (!br_dev)
2582 return -ENODEV;
2583
2584 ops = br_dev->netdev_ops;
2585 bdev = br_dev;
2586 }
2587
2588 for_each_netdev(net, dev) {
2589 if (brport_idx && (dev->ifindex != brport_idx))
2590 continue;
2591
2592 if (!br_idx) { /* user did not specify a specific bridge */
2593 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2594 br_dev = netdev_master_upper_dev_get(dev);
2595 cops = br_dev->netdev_ops;
2596 }
2597
2598 bdev = dev;
2599 } else {
2600 if (dev != br_dev &&
2601 !(dev->priv_flags & IFF_BRIDGE_PORT))
2602 continue;
2603
2604 if (br_dev != netdev_master_upper_dev_get(dev) &&
2605 !(dev->priv_flags & IFF_EBRIDGE))
2606 continue;
2607
2608 bdev = br_dev;
2609 cops = ops;
2610 }
2611
2612 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2613 if (cops && cops->ndo_fdb_dump)
2614 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2615 idx);
2616 }
2617
2618 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2619 if (dev->netdev_ops->ndo_fdb_dump)
2620 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, bdev, dev,
2621 idx);
2622
2623 cops = NULL;
2624 }
2625
2626 cb->args[0] = idx;
2627 return skb->len;
2628 }
2629
2630 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2631 struct net_device *dev, u16 mode)
2632 {
2633 struct nlmsghdr *nlh;
2634 struct ifinfomsg *ifm;
2635 struct nlattr *br_afspec;
2636 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2637 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2638
2639 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2640 if (nlh == NULL)
2641 return -EMSGSIZE;
2642
2643 ifm = nlmsg_data(nlh);
2644 ifm->ifi_family = AF_BRIDGE;
2645 ifm->__ifi_pad = 0;
2646 ifm->ifi_type = dev->type;
2647 ifm->ifi_index = dev->ifindex;
2648 ifm->ifi_flags = dev_get_flags(dev);
2649 ifm->ifi_change = 0;
2650
2651
2652 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2653 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2654 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2655 (br_dev &&
2656 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2657 (dev->addr_len &&
2658 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2659 (dev->ifindex != dev->iflink &&
2660 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2661 goto nla_put_failure;
2662
2663 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2664 if (!br_afspec)
2665 goto nla_put_failure;
2666
2667 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2668 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2669 nla_nest_cancel(skb, br_afspec);
2670 goto nla_put_failure;
2671 }
2672 nla_nest_end(skb, br_afspec);
2673
2674 return nlmsg_end(skb, nlh);
2675 nla_put_failure:
2676 nlmsg_cancel(skb, nlh);
2677 return -EMSGSIZE;
2678 }
2679 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2680
2681 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2682 {
2683 struct net *net = sock_net(skb->sk);
2684 struct net_device *dev;
2685 int idx = 0;
2686 u32 portid = NETLINK_CB(cb->skb).portid;
2687 u32 seq = cb->nlh->nlmsg_seq;
2688 struct nlattr *extfilt;
2689 u32 filter_mask = 0;
2690
2691 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2692 IFLA_EXT_MASK);
2693 if (extfilt)
2694 filter_mask = nla_get_u32(extfilt);
2695
2696 rcu_read_lock();
2697 for_each_netdev_rcu(net, dev) {
2698 const struct net_device_ops *ops = dev->netdev_ops;
2699 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2700
2701 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2702 if (idx >= cb->args[0] &&
2703 br_dev->netdev_ops->ndo_bridge_getlink(
2704 skb, portid, seq, dev, filter_mask) < 0)
2705 break;
2706 idx++;
2707 }
2708
2709 if (ops->ndo_bridge_getlink) {
2710 if (idx >= cb->args[0] &&
2711 ops->ndo_bridge_getlink(skb, portid, seq, dev,
2712 filter_mask) < 0)
2713 break;
2714 idx++;
2715 }
2716 }
2717 rcu_read_unlock();
2718 cb->args[0] = idx;
2719
2720 return skb->len;
2721 }
2722
2723 static inline size_t bridge_nlmsg_size(void)
2724 {
2725 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2726 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
2727 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
2728 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
2729 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
2730 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
2731 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
2732 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
2733 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2734 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
2735 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
2736 }
2737
2738 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2739 {
2740 struct net *net = dev_net(dev);
2741 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2742 struct sk_buff *skb;
2743 int err = -EOPNOTSUPP;
2744
2745 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2746 if (!skb) {
2747 err = -ENOMEM;
2748 goto errout;
2749 }
2750
2751 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2752 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2753 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2754 if (err < 0)
2755 goto errout;
2756 }
2757
2758 if ((flags & BRIDGE_FLAGS_SELF) &&
2759 dev->netdev_ops->ndo_bridge_getlink) {
2760 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2761 if (err < 0)
2762 goto errout;
2763 }
2764
2765 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2766 return 0;
2767 errout:
2768 WARN_ON(err == -EMSGSIZE);
2769 kfree_skb(skb);
2770 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2771 return err;
2772 }
2773
2774 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2775 {
2776 struct net *net = sock_net(skb->sk);
2777 struct ifinfomsg *ifm;
2778 struct net_device *dev;
2779 struct nlattr *br_spec, *attr = NULL;
2780 int rem, err = -EOPNOTSUPP;
2781 u16 oflags, flags = 0;
2782 bool have_flags = false;
2783
2784 if (nlmsg_len(nlh) < sizeof(*ifm))
2785 return -EINVAL;
2786
2787 ifm = nlmsg_data(nlh);
2788 if (ifm->ifi_family != AF_BRIDGE)
2789 return -EPFNOSUPPORT;
2790
2791 dev = __dev_get_by_index(net, ifm->ifi_index);
2792 if (!dev) {
2793 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2794 return -ENODEV;
2795 }
2796
2797 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2798 if (br_spec) {
2799 nla_for_each_nested(attr, br_spec, rem) {
2800 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2801 have_flags = true;
2802 flags = nla_get_u16(attr);
2803 break;
2804 }
2805 }
2806 }
2807
2808 oflags = flags;
2809
2810 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2811 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2812
2813 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2814 err = -EOPNOTSUPP;
2815 goto out;
2816 }
2817
2818 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2819 if (err)
2820 goto out;
2821
2822 flags &= ~BRIDGE_FLAGS_MASTER;
2823 }
2824
2825 if ((flags & BRIDGE_FLAGS_SELF)) {
2826 if (!dev->netdev_ops->ndo_bridge_setlink)
2827 err = -EOPNOTSUPP;
2828 else
2829 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2830
2831 if (!err)
2832 flags &= ~BRIDGE_FLAGS_SELF;
2833 }
2834
2835 if (have_flags)
2836 memcpy(nla_data(attr), &flags, sizeof(flags));
2837 /* Generate event to notify upper layer of bridge change */
2838 if (!err)
2839 err = rtnl_bridge_notify(dev, oflags);
2840 out:
2841 return err;
2842 }
2843
2844 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2845 {
2846 struct net *net = sock_net(skb->sk);
2847 struct ifinfomsg *ifm;
2848 struct net_device *dev;
2849 struct nlattr *br_spec, *attr = NULL;
2850 int rem, err = -EOPNOTSUPP;
2851 u16 oflags, flags = 0;
2852 bool have_flags = false;
2853
2854 if (nlmsg_len(nlh) < sizeof(*ifm))
2855 return -EINVAL;
2856
2857 ifm = nlmsg_data(nlh);
2858 if (ifm->ifi_family != AF_BRIDGE)
2859 return -EPFNOSUPPORT;
2860
2861 dev = __dev_get_by_index(net, ifm->ifi_index);
2862 if (!dev) {
2863 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2864 return -ENODEV;
2865 }
2866
2867 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2868 if (br_spec) {
2869 nla_for_each_nested(attr, br_spec, rem) {
2870 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2871 have_flags = true;
2872 flags = nla_get_u16(attr);
2873 break;
2874 }
2875 }
2876 }
2877
2878 oflags = flags;
2879
2880 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2881 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2882
2883 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2884 err = -EOPNOTSUPP;
2885 goto out;
2886 }
2887
2888 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2889 if (err)
2890 goto out;
2891
2892 flags &= ~BRIDGE_FLAGS_MASTER;
2893 }
2894
2895 if ((flags & BRIDGE_FLAGS_SELF)) {
2896 if (!dev->netdev_ops->ndo_bridge_dellink)
2897 err = -EOPNOTSUPP;
2898 else
2899 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2900
2901 if (!err)
2902 flags &= ~BRIDGE_FLAGS_SELF;
2903 }
2904
2905 if (have_flags)
2906 memcpy(nla_data(attr), &flags, sizeof(flags));
2907 /* Generate event to notify upper layer of bridge change */
2908 if (!err)
2909 err = rtnl_bridge_notify(dev, oflags);
2910 out:
2911 return err;
2912 }
2913
2914 /* Process one rtnetlink message. */
2915
2916 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2917 {
2918 struct net *net = sock_net(skb->sk);
2919 rtnl_doit_func doit;
2920 int sz_idx, kind;
2921 int family;
2922 int type;
2923 int err;
2924
2925 type = nlh->nlmsg_type;
2926 if (type > RTM_MAX)
2927 return -EOPNOTSUPP;
2928
2929 type -= RTM_BASE;
2930
2931 /* All the messages must have at least 1 byte length */
2932 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2933 return 0;
2934
2935 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2936 sz_idx = type>>2;
2937 kind = type&3;
2938
2939 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
2940 return -EPERM;
2941
2942 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2943 struct sock *rtnl;
2944 rtnl_dumpit_func dumpit;
2945 rtnl_calcit_func calcit;
2946 u16 min_dump_alloc = 0;
2947
2948 dumpit = rtnl_get_dumpit(family, type);
2949 if (dumpit == NULL)
2950 return -EOPNOTSUPP;
2951 calcit = rtnl_get_calcit(family, type);
2952 if (calcit)
2953 min_dump_alloc = calcit(skb, nlh);
2954
2955 __rtnl_unlock();
2956 rtnl = net->rtnl;
2957 {
2958 struct netlink_dump_control c = {
2959 .dump = dumpit,
2960 .min_dump_alloc = min_dump_alloc,
2961 };
2962 err = netlink_dump_start(rtnl, skb, nlh, &c);
2963 }
2964 rtnl_lock();
2965 return err;
2966 }
2967
2968 doit = rtnl_get_doit(family, type);
2969 if (doit == NULL)
2970 return -EOPNOTSUPP;
2971
2972 return doit(skb, nlh);
2973 }
2974
2975 static void rtnetlink_rcv(struct sk_buff *skb)
2976 {
2977 rtnl_lock();
2978 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2979 rtnl_unlock();
2980 }
2981
2982 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2983 {
2984 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2985
2986 switch (event) {
2987 case NETDEV_UP:
2988 case NETDEV_DOWN:
2989 case NETDEV_PRE_UP:
2990 case NETDEV_POST_INIT:
2991 case NETDEV_REGISTER:
2992 case NETDEV_CHANGE:
2993 case NETDEV_PRE_TYPE_CHANGE:
2994 case NETDEV_GOING_DOWN:
2995 case NETDEV_UNREGISTER:
2996 case NETDEV_UNREGISTER_FINAL:
2997 case NETDEV_RELEASE:
2998 case NETDEV_JOIN:
2999 break;
3000 default:
3001 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3002 break;
3003 }
3004 return NOTIFY_DONE;
3005 }
3006
3007 static struct notifier_block rtnetlink_dev_notifier = {
3008 .notifier_call = rtnetlink_event,
3009 };
3010
3011
3012 static int __net_init rtnetlink_net_init(struct net *net)
3013 {
3014 struct sock *sk;
3015 struct netlink_kernel_cfg cfg = {
3016 .groups = RTNLGRP_MAX,
3017 .input = rtnetlink_rcv,
3018 .cb_mutex = &rtnl_mutex,
3019 .flags = NL_CFG_F_NONROOT_RECV,
3020 };
3021
3022 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3023 if (!sk)
3024 return -ENOMEM;
3025 net->rtnl = sk;
3026 return 0;
3027 }
3028
3029 static void __net_exit rtnetlink_net_exit(struct net *net)
3030 {
3031 netlink_kernel_release(net->rtnl);
3032 net->rtnl = NULL;
3033 }
3034
3035 static struct pernet_operations rtnetlink_net_ops = {
3036 .init = rtnetlink_net_init,
3037 .exit = rtnetlink_net_exit,
3038 };
3039
3040 void __init rtnetlink_init(void)
3041 {
3042 if (register_pernet_subsys(&rtnetlink_net_ops))
3043 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3044
3045 register_netdevice_notifier(&rtnetlink_dev_notifier);
3046
3047 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3048 rtnl_dump_ifinfo, rtnl_calcit);
3049 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3050 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3051 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3052
3053 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3054 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3055
3056 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3057 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3058 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3059
3060 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3061 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3062 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3063 }
3064
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