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