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