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Merge tag 'dmaengine-fixes-3.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel...
[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 /**
357 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
358 * @ops: struct rtnl_link_ops * to unregister
359 */
360 void rtnl_link_unregister(struct rtnl_link_ops *ops)
361 {
362 rtnl_lock();
363 __rtnl_link_unregister(ops);
364 rtnl_unlock();
365 }
366 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
367
368 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
369 {
370 struct net_device *master_dev;
371 const struct rtnl_link_ops *ops;
372
373 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
374 if (!master_dev)
375 return 0;
376 ops = master_dev->rtnl_link_ops;
377 if (!ops || !ops->get_slave_size)
378 return 0;
379 /* IFLA_INFO_SLAVE_DATA + nested data */
380 return nla_total_size(sizeof(struct nlattr)) +
381 ops->get_slave_size(master_dev, dev);
382 }
383
384 static size_t rtnl_link_get_size(const struct net_device *dev)
385 {
386 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
387 size_t size;
388
389 if (!ops)
390 return 0;
391
392 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
393 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
394
395 if (ops->get_size)
396 /* IFLA_INFO_DATA + nested data */
397 size += nla_total_size(sizeof(struct nlattr)) +
398 ops->get_size(dev);
399
400 if (ops->get_xstats_size)
401 /* IFLA_INFO_XSTATS */
402 size += nla_total_size(ops->get_xstats_size(dev));
403
404 size += rtnl_link_get_slave_info_data_size(dev);
405
406 return size;
407 }
408
409 static LIST_HEAD(rtnl_af_ops);
410
411 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
412 {
413 const struct rtnl_af_ops *ops;
414
415 list_for_each_entry(ops, &rtnl_af_ops, list) {
416 if (ops->family == family)
417 return ops;
418 }
419
420 return NULL;
421 }
422
423 /**
424 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
425 * @ops: struct rtnl_af_ops * to register
426 *
427 * Returns 0 on success or a negative error code.
428 */
429 void rtnl_af_register(struct rtnl_af_ops *ops)
430 {
431 rtnl_lock();
432 list_add_tail(&ops->list, &rtnl_af_ops);
433 rtnl_unlock();
434 }
435 EXPORT_SYMBOL_GPL(rtnl_af_register);
436
437 /**
438 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
439 * @ops: struct rtnl_af_ops * to unregister
440 *
441 * The caller must hold the rtnl_mutex.
442 */
443 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
444 {
445 list_del(&ops->list);
446 }
447 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
448
449 /**
450 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
451 * @ops: struct rtnl_af_ops * to unregister
452 */
453 void rtnl_af_unregister(struct rtnl_af_ops *ops)
454 {
455 rtnl_lock();
456 __rtnl_af_unregister(ops);
457 rtnl_unlock();
458 }
459 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
460
461 static size_t rtnl_link_get_af_size(const struct net_device *dev)
462 {
463 struct rtnl_af_ops *af_ops;
464 size_t size;
465
466 /* IFLA_AF_SPEC */
467 size = nla_total_size(sizeof(struct nlattr));
468
469 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
470 if (af_ops->get_link_af_size) {
471 /* AF_* + nested data */
472 size += nla_total_size(sizeof(struct nlattr)) +
473 af_ops->get_link_af_size(dev);
474 }
475 }
476
477 return size;
478 }
479
480 static bool rtnl_have_link_slave_info(const struct net_device *dev)
481 {
482 struct net_device *master_dev;
483
484 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
485 if (master_dev && master_dev->rtnl_link_ops)
486 return true;
487 return false;
488 }
489
490 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
491 const struct net_device *dev)
492 {
493 struct net_device *master_dev;
494 const struct rtnl_link_ops *ops;
495 struct nlattr *slave_data;
496 int err;
497
498 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
499 if (!master_dev)
500 return 0;
501 ops = master_dev->rtnl_link_ops;
502 if (!ops)
503 return 0;
504 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
505 return -EMSGSIZE;
506 if (ops->fill_slave_info) {
507 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
508 if (!slave_data)
509 return -EMSGSIZE;
510 err = ops->fill_slave_info(skb, master_dev, dev);
511 if (err < 0)
512 goto err_cancel_slave_data;
513 nla_nest_end(skb, slave_data);
514 }
515 return 0;
516
517 err_cancel_slave_data:
518 nla_nest_cancel(skb, slave_data);
519 return err;
520 }
521
522 static int rtnl_link_info_fill(struct sk_buff *skb,
523 const struct net_device *dev)
524 {
525 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
526 struct nlattr *data;
527 int err;
528
529 if (!ops)
530 return 0;
531 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
532 return -EMSGSIZE;
533 if (ops->fill_xstats) {
534 err = ops->fill_xstats(skb, dev);
535 if (err < 0)
536 return err;
537 }
538 if (ops->fill_info) {
539 data = nla_nest_start(skb, IFLA_INFO_DATA);
540 if (data == NULL)
541 return -EMSGSIZE;
542 err = ops->fill_info(skb, dev);
543 if (err < 0)
544 goto err_cancel_data;
545 nla_nest_end(skb, data);
546 }
547 return 0;
548
549 err_cancel_data:
550 nla_nest_cancel(skb, data);
551 return err;
552 }
553
554 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
555 {
556 struct nlattr *linkinfo;
557 int err = -EMSGSIZE;
558
559 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
560 if (linkinfo == NULL)
561 goto out;
562
563 err = rtnl_link_info_fill(skb, dev);
564 if (err < 0)
565 goto err_cancel_link;
566
567 err = rtnl_link_slave_info_fill(skb, dev);
568 if (err < 0)
569 goto err_cancel_link;
570
571 nla_nest_end(skb, linkinfo);
572 return 0;
573
574 err_cancel_link:
575 nla_nest_cancel(skb, linkinfo);
576 out:
577 return err;
578 }
579
580 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
581 {
582 struct sock *rtnl = net->rtnl;
583 int err = 0;
584
585 NETLINK_CB(skb).dst_group = group;
586 if (echo)
587 atomic_inc(&skb->users);
588 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
589 if (echo)
590 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
591 return err;
592 }
593
594 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
595 {
596 struct sock *rtnl = net->rtnl;
597
598 return nlmsg_unicast(rtnl, skb, pid);
599 }
600 EXPORT_SYMBOL(rtnl_unicast);
601
602 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
603 struct nlmsghdr *nlh, gfp_t flags)
604 {
605 struct sock *rtnl = net->rtnl;
606 int report = 0;
607
608 if (nlh)
609 report = nlmsg_report(nlh);
610
611 nlmsg_notify(rtnl, skb, pid, group, report, flags);
612 }
613 EXPORT_SYMBOL(rtnl_notify);
614
615 void rtnl_set_sk_err(struct net *net, u32 group, int error)
616 {
617 struct sock *rtnl = net->rtnl;
618
619 netlink_set_err(rtnl, 0, group, error);
620 }
621 EXPORT_SYMBOL(rtnl_set_sk_err);
622
623 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
624 {
625 struct nlattr *mx;
626 int i, valid = 0;
627
628 mx = nla_nest_start(skb, RTA_METRICS);
629 if (mx == NULL)
630 return -ENOBUFS;
631
632 for (i = 0; i < RTAX_MAX; i++) {
633 if (metrics[i]) {
634 valid++;
635 if (nla_put_u32(skb, i+1, metrics[i]))
636 goto nla_put_failure;
637 }
638 }
639
640 if (!valid) {
641 nla_nest_cancel(skb, mx);
642 return 0;
643 }
644
645 return nla_nest_end(skb, mx);
646
647 nla_put_failure:
648 nla_nest_cancel(skb, mx);
649 return -EMSGSIZE;
650 }
651 EXPORT_SYMBOL(rtnetlink_put_metrics);
652
653 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
654 long expires, u32 error)
655 {
656 struct rta_cacheinfo ci = {
657 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
658 .rta_used = dst->__use,
659 .rta_clntref = atomic_read(&(dst->__refcnt)),
660 .rta_error = error,
661 .rta_id = id,
662 };
663
664 if (expires) {
665 unsigned long clock;
666
667 clock = jiffies_to_clock_t(abs(expires));
668 clock = min_t(unsigned long, clock, INT_MAX);
669 ci.rta_expires = (expires > 0) ? clock : -clock;
670 }
671 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
672 }
673 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
674
675 static void set_operstate(struct net_device *dev, unsigned char transition)
676 {
677 unsigned char operstate = dev->operstate;
678
679 switch (transition) {
680 case IF_OPER_UP:
681 if ((operstate == IF_OPER_DORMANT ||
682 operstate == IF_OPER_UNKNOWN) &&
683 !netif_dormant(dev))
684 operstate = IF_OPER_UP;
685 break;
686
687 case IF_OPER_DORMANT:
688 if (operstate == IF_OPER_UP ||
689 operstate == IF_OPER_UNKNOWN)
690 operstate = IF_OPER_DORMANT;
691 break;
692 }
693
694 if (dev->operstate != operstate) {
695 write_lock_bh(&dev_base_lock);
696 dev->operstate = operstate;
697 write_unlock_bh(&dev_base_lock);
698 netdev_state_change(dev);
699 }
700 }
701
702 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
703 {
704 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
705 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
706 }
707
708 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
709 const struct ifinfomsg *ifm)
710 {
711 unsigned int flags = ifm->ifi_flags;
712
713 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
714 if (ifm->ifi_change)
715 flags = (flags & ifm->ifi_change) |
716 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
717
718 return flags;
719 }
720
721 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
722 const struct rtnl_link_stats64 *b)
723 {
724 a->rx_packets = b->rx_packets;
725 a->tx_packets = b->tx_packets;
726 a->rx_bytes = b->rx_bytes;
727 a->tx_bytes = b->tx_bytes;
728 a->rx_errors = b->rx_errors;
729 a->tx_errors = b->tx_errors;
730 a->rx_dropped = b->rx_dropped;
731 a->tx_dropped = b->tx_dropped;
732
733 a->multicast = b->multicast;
734 a->collisions = b->collisions;
735
736 a->rx_length_errors = b->rx_length_errors;
737 a->rx_over_errors = b->rx_over_errors;
738 a->rx_crc_errors = b->rx_crc_errors;
739 a->rx_frame_errors = b->rx_frame_errors;
740 a->rx_fifo_errors = b->rx_fifo_errors;
741 a->rx_missed_errors = b->rx_missed_errors;
742
743 a->tx_aborted_errors = b->tx_aborted_errors;
744 a->tx_carrier_errors = b->tx_carrier_errors;
745 a->tx_fifo_errors = b->tx_fifo_errors;
746 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
747 a->tx_window_errors = b->tx_window_errors;
748
749 a->rx_compressed = b->rx_compressed;
750 a->tx_compressed = b->tx_compressed;
751 }
752
753 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
754 {
755 memcpy(v, b, sizeof(*b));
756 }
757
758 /* All VF info */
759 static inline int rtnl_vfinfo_size(const struct net_device *dev,
760 u32 ext_filter_mask)
761 {
762 if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
763 (ext_filter_mask & RTEXT_FILTER_VF)) {
764 int num_vfs = dev_num_vf(dev->dev.parent);
765 size_t size = nla_total_size(sizeof(struct nlattr));
766 size += nla_total_size(num_vfs * sizeof(struct nlattr));
767 size += num_vfs *
768 (nla_total_size(sizeof(struct ifla_vf_mac)) +
769 nla_total_size(sizeof(struct ifla_vf_vlan)) +
770 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
771 nla_total_size(sizeof(struct ifla_vf_spoofchk)));
772 return size;
773 } else
774 return 0;
775 }
776
777 static size_t rtnl_port_size(const struct net_device *dev)
778 {
779 size_t port_size = nla_total_size(4) /* PORT_VF */
780 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
781 + nla_total_size(sizeof(struct ifla_port_vsi))
782 /* PORT_VSI_TYPE */
783 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
784 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
785 + nla_total_size(1) /* PROT_VDP_REQUEST */
786 + nla_total_size(2); /* PORT_VDP_RESPONSE */
787 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
788 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
789 + port_size;
790 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
791 + port_size;
792
793 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
794 return 0;
795 if (dev_num_vf(dev->dev.parent))
796 return port_self_size + vf_ports_size +
797 vf_port_size * dev_num_vf(dev->dev.parent);
798 else
799 return port_self_size;
800 }
801
802 static noinline size_t if_nlmsg_size(const struct net_device *dev,
803 u32 ext_filter_mask)
804 {
805 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
806 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
807 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
808 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
809 + nla_total_size(sizeof(struct rtnl_link_ifmap))
810 + nla_total_size(sizeof(struct rtnl_link_stats))
811 + nla_total_size(sizeof(struct rtnl_link_stats64))
812 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
813 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
814 + nla_total_size(4) /* IFLA_TXQLEN */
815 + nla_total_size(4) /* IFLA_WEIGHT */
816 + nla_total_size(4) /* IFLA_MTU */
817 + nla_total_size(4) /* IFLA_LINK */
818 + nla_total_size(4) /* IFLA_MASTER */
819 + nla_total_size(1) /* IFLA_CARRIER */
820 + nla_total_size(4) /* IFLA_PROMISCUITY */
821 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
822 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
823 + nla_total_size(1) /* IFLA_OPERSTATE */
824 + nla_total_size(1) /* IFLA_LINKMODE */
825 + nla_total_size(ext_filter_mask
826 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
827 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
828 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
829 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
830 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
831 + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */
832 }
833
834 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
835 {
836 struct nlattr *vf_ports;
837 struct nlattr *vf_port;
838 int vf;
839 int err;
840
841 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
842 if (!vf_ports)
843 return -EMSGSIZE;
844
845 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
846 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
847 if (!vf_port)
848 goto nla_put_failure;
849 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
850 goto nla_put_failure;
851 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
852 if (err == -EMSGSIZE)
853 goto nla_put_failure;
854 if (err) {
855 nla_nest_cancel(skb, vf_port);
856 continue;
857 }
858 nla_nest_end(skb, vf_port);
859 }
860
861 nla_nest_end(skb, vf_ports);
862
863 return 0;
864
865 nla_put_failure:
866 nla_nest_cancel(skb, vf_ports);
867 return -EMSGSIZE;
868 }
869
870 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
871 {
872 struct nlattr *port_self;
873 int err;
874
875 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
876 if (!port_self)
877 return -EMSGSIZE;
878
879 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
880 if (err) {
881 nla_nest_cancel(skb, port_self);
882 return (err == -EMSGSIZE) ? err : 0;
883 }
884
885 nla_nest_end(skb, port_self);
886
887 return 0;
888 }
889
890 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
891 {
892 int err;
893
894 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
895 return 0;
896
897 err = rtnl_port_self_fill(skb, dev);
898 if (err)
899 return err;
900
901 if (dev_num_vf(dev->dev.parent)) {
902 err = rtnl_vf_ports_fill(skb, dev);
903 if (err)
904 return err;
905 }
906
907 return 0;
908 }
909
910 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
911 {
912 int err;
913 struct netdev_phys_port_id ppid;
914
915 err = dev_get_phys_port_id(dev, &ppid);
916 if (err) {
917 if (err == -EOPNOTSUPP)
918 return 0;
919 return err;
920 }
921
922 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
923 return -EMSGSIZE;
924
925 return 0;
926 }
927
928 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
929 int type, u32 pid, u32 seq, u32 change,
930 unsigned int flags, u32 ext_filter_mask)
931 {
932 struct ifinfomsg *ifm;
933 struct nlmsghdr *nlh;
934 struct rtnl_link_stats64 temp;
935 const struct rtnl_link_stats64 *stats;
936 struct nlattr *attr, *af_spec;
937 struct rtnl_af_ops *af_ops;
938 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
939
940 ASSERT_RTNL();
941 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
942 if (nlh == NULL)
943 return -EMSGSIZE;
944
945 ifm = nlmsg_data(nlh);
946 ifm->ifi_family = AF_UNSPEC;
947 ifm->__ifi_pad = 0;
948 ifm->ifi_type = dev->type;
949 ifm->ifi_index = dev->ifindex;
950 ifm->ifi_flags = dev_get_flags(dev);
951 ifm->ifi_change = change;
952
953 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
954 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
955 nla_put_u8(skb, IFLA_OPERSTATE,
956 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
957 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
958 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
959 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
960 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
961 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
962 #ifdef CONFIG_RPS
963 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
964 #endif
965 (dev->ifindex != dev->iflink &&
966 nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
967 (upper_dev &&
968 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
969 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
970 (dev->qdisc &&
971 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
972 (dev->ifalias &&
973 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)))
974 goto nla_put_failure;
975
976 if (1) {
977 struct rtnl_link_ifmap map = {
978 .mem_start = dev->mem_start,
979 .mem_end = dev->mem_end,
980 .base_addr = dev->base_addr,
981 .irq = dev->irq,
982 .dma = dev->dma,
983 .port = dev->if_port,
984 };
985 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
986 goto nla_put_failure;
987 }
988
989 if (dev->addr_len) {
990 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
991 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
992 goto nla_put_failure;
993 }
994
995 if (rtnl_phys_port_id_fill(skb, dev))
996 goto nla_put_failure;
997
998 attr = nla_reserve(skb, IFLA_STATS,
999 sizeof(struct rtnl_link_stats));
1000 if (attr == NULL)
1001 goto nla_put_failure;
1002
1003 stats = dev_get_stats(dev, &temp);
1004 copy_rtnl_link_stats(nla_data(attr), stats);
1005
1006 attr = nla_reserve(skb, IFLA_STATS64,
1007 sizeof(struct rtnl_link_stats64));
1008 if (attr == NULL)
1009 goto nla_put_failure;
1010 copy_rtnl_link_stats64(nla_data(attr), stats);
1011
1012 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1013 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1014 goto nla_put_failure;
1015
1016 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1017 && (ext_filter_mask & RTEXT_FILTER_VF)) {
1018 int i;
1019
1020 struct nlattr *vfinfo, *vf;
1021 int num_vfs = dev_num_vf(dev->dev.parent);
1022
1023 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1024 if (!vfinfo)
1025 goto nla_put_failure;
1026 for (i = 0; i < num_vfs; i++) {
1027 struct ifla_vf_info ivi;
1028 struct ifla_vf_mac vf_mac;
1029 struct ifla_vf_vlan vf_vlan;
1030 struct ifla_vf_tx_rate vf_tx_rate;
1031 struct ifla_vf_spoofchk vf_spoofchk;
1032 struct ifla_vf_link_state vf_linkstate;
1033
1034 /*
1035 * Not all SR-IOV capable drivers support the
1036 * spoofcheck query. Preset to -1 so the user
1037 * space tool can detect that the driver didn't
1038 * report anything.
1039 */
1040 ivi.spoofchk = -1;
1041 memset(ivi.mac, 0, sizeof(ivi.mac));
1042 /* The default value for VF link state is "auto"
1043 * IFLA_VF_LINK_STATE_AUTO which equals zero
1044 */
1045 ivi.linkstate = 0;
1046 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1047 break;
1048 vf_mac.vf =
1049 vf_vlan.vf =
1050 vf_tx_rate.vf =
1051 vf_spoofchk.vf =
1052 vf_linkstate.vf = ivi.vf;
1053
1054 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1055 vf_vlan.vlan = ivi.vlan;
1056 vf_vlan.qos = ivi.qos;
1057 vf_tx_rate.rate = ivi.tx_rate;
1058 vf_spoofchk.setting = ivi.spoofchk;
1059 vf_linkstate.link_state = ivi.linkstate;
1060 vf = nla_nest_start(skb, IFLA_VF_INFO);
1061 if (!vf) {
1062 nla_nest_cancel(skb, vfinfo);
1063 goto nla_put_failure;
1064 }
1065 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1066 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1067 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1068 &vf_tx_rate) ||
1069 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1070 &vf_spoofchk) ||
1071 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1072 &vf_linkstate))
1073 goto nla_put_failure;
1074 nla_nest_end(skb, vf);
1075 }
1076 nla_nest_end(skb, vfinfo);
1077 }
1078
1079 if (rtnl_port_fill(skb, dev))
1080 goto nla_put_failure;
1081
1082 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1083 if (rtnl_link_fill(skb, dev) < 0)
1084 goto nla_put_failure;
1085 }
1086
1087 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1088 goto nla_put_failure;
1089
1090 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1091 if (af_ops->fill_link_af) {
1092 struct nlattr *af;
1093 int err;
1094
1095 if (!(af = nla_nest_start(skb, af_ops->family)))
1096 goto nla_put_failure;
1097
1098 err = af_ops->fill_link_af(skb, dev);
1099
1100 /*
1101 * Caller may return ENODATA to indicate that there
1102 * was no data to be dumped. This is not an error, it
1103 * means we should trim the attribute header and
1104 * continue.
1105 */
1106 if (err == -ENODATA)
1107 nla_nest_cancel(skb, af);
1108 else if (err < 0)
1109 goto nla_put_failure;
1110
1111 nla_nest_end(skb, af);
1112 }
1113 }
1114
1115 nla_nest_end(skb, af_spec);
1116
1117 return nlmsg_end(skb, nlh);
1118
1119 nla_put_failure:
1120 nlmsg_cancel(skb, nlh);
1121 return -EMSGSIZE;
1122 }
1123
1124 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1125 {
1126 struct net *net = sock_net(skb->sk);
1127 int h, s_h;
1128 int idx = 0, s_idx;
1129 struct net_device *dev;
1130 struct hlist_head *head;
1131 struct nlattr *tb[IFLA_MAX+1];
1132 u32 ext_filter_mask = 0;
1133
1134 s_h = cb->args[0];
1135 s_idx = cb->args[1];
1136
1137 rcu_read_lock();
1138 cb->seq = net->dev_base_seq;
1139
1140 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1141 ifla_policy) >= 0) {
1142
1143 if (tb[IFLA_EXT_MASK])
1144 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1145 }
1146
1147 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1148 idx = 0;
1149 head = &net->dev_index_head[h];
1150 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1151 if (idx < s_idx)
1152 goto cont;
1153 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1154 NETLINK_CB(cb->skb).portid,
1155 cb->nlh->nlmsg_seq, 0,
1156 NLM_F_MULTI,
1157 ext_filter_mask) <= 0)
1158 goto out;
1159
1160 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1161 cont:
1162 idx++;
1163 }
1164 }
1165 out:
1166 rcu_read_unlock();
1167 cb->args[1] = idx;
1168 cb->args[0] = h;
1169
1170 return skb->len;
1171 }
1172
1173 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1174 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1175 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1176 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1177 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1178 [IFLA_MTU] = { .type = NLA_U32 },
1179 [IFLA_LINK] = { .type = NLA_U32 },
1180 [IFLA_MASTER] = { .type = NLA_U32 },
1181 [IFLA_CARRIER] = { .type = NLA_U8 },
1182 [IFLA_TXQLEN] = { .type = NLA_U32 },
1183 [IFLA_WEIGHT] = { .type = NLA_U32 },
1184 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1185 [IFLA_LINKMODE] = { .type = NLA_U8 },
1186 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1187 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1188 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1189 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1190 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1191 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1192 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1193 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1194 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1195 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1196 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1197 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1198 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
1199 };
1200 EXPORT_SYMBOL(ifla_policy);
1201
1202 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1203 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1204 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1205 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1206 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1207 };
1208
1209 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1210 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1211 };
1212
1213 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1214 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1215 .len = sizeof(struct ifla_vf_mac) },
1216 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1217 .len = sizeof(struct ifla_vf_vlan) },
1218 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1219 .len = sizeof(struct ifla_vf_tx_rate) },
1220 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY,
1221 .len = sizeof(struct ifla_vf_spoofchk) },
1222 };
1223
1224 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1225 [IFLA_PORT_VF] = { .type = NLA_U32 },
1226 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1227 .len = PORT_PROFILE_MAX },
1228 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1229 .len = sizeof(struct ifla_port_vsi)},
1230 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1231 .len = PORT_UUID_MAX },
1232 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1233 .len = PORT_UUID_MAX },
1234 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1235 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1236 };
1237
1238 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1239 {
1240 struct net *net;
1241 /* Examine the link attributes and figure out which
1242 * network namespace we are talking about.
1243 */
1244 if (tb[IFLA_NET_NS_PID])
1245 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1246 else if (tb[IFLA_NET_NS_FD])
1247 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1248 else
1249 net = get_net(src_net);
1250 return net;
1251 }
1252 EXPORT_SYMBOL(rtnl_link_get_net);
1253
1254 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1255 {
1256 if (dev) {
1257 if (tb[IFLA_ADDRESS] &&
1258 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1259 return -EINVAL;
1260
1261 if (tb[IFLA_BROADCAST] &&
1262 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1263 return -EINVAL;
1264 }
1265
1266 if (tb[IFLA_AF_SPEC]) {
1267 struct nlattr *af;
1268 int rem, err;
1269
1270 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1271 const struct rtnl_af_ops *af_ops;
1272
1273 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1274 return -EAFNOSUPPORT;
1275
1276 if (!af_ops->set_link_af)
1277 return -EOPNOTSUPP;
1278
1279 if (af_ops->validate_link_af) {
1280 err = af_ops->validate_link_af(dev, af);
1281 if (err < 0)
1282 return err;
1283 }
1284 }
1285 }
1286
1287 return 0;
1288 }
1289
1290 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1291 {
1292 int rem, err = -EINVAL;
1293 struct nlattr *vf;
1294 const struct net_device_ops *ops = dev->netdev_ops;
1295
1296 nla_for_each_nested(vf, attr, rem) {
1297 switch (nla_type(vf)) {
1298 case IFLA_VF_MAC: {
1299 struct ifla_vf_mac *ivm;
1300 ivm = nla_data(vf);
1301 err = -EOPNOTSUPP;
1302 if (ops->ndo_set_vf_mac)
1303 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1304 ivm->mac);
1305 break;
1306 }
1307 case IFLA_VF_VLAN: {
1308 struct ifla_vf_vlan *ivv;
1309 ivv = nla_data(vf);
1310 err = -EOPNOTSUPP;
1311 if (ops->ndo_set_vf_vlan)
1312 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1313 ivv->vlan,
1314 ivv->qos);
1315 break;
1316 }
1317 case IFLA_VF_TX_RATE: {
1318 struct ifla_vf_tx_rate *ivt;
1319 ivt = nla_data(vf);
1320 err = -EOPNOTSUPP;
1321 if (ops->ndo_set_vf_tx_rate)
1322 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1323 ivt->rate);
1324 break;
1325 }
1326 case IFLA_VF_SPOOFCHK: {
1327 struct ifla_vf_spoofchk *ivs;
1328 ivs = nla_data(vf);
1329 err = -EOPNOTSUPP;
1330 if (ops->ndo_set_vf_spoofchk)
1331 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1332 ivs->setting);
1333 break;
1334 }
1335 case IFLA_VF_LINK_STATE: {
1336 struct ifla_vf_link_state *ivl;
1337 ivl = nla_data(vf);
1338 err = -EOPNOTSUPP;
1339 if (ops->ndo_set_vf_link_state)
1340 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1341 ivl->link_state);
1342 break;
1343 }
1344 default:
1345 err = -EINVAL;
1346 break;
1347 }
1348 if (err)
1349 break;
1350 }
1351 return err;
1352 }
1353
1354 static int do_set_master(struct net_device *dev, int ifindex)
1355 {
1356 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1357 const struct net_device_ops *ops;
1358 int err;
1359
1360 if (upper_dev) {
1361 if (upper_dev->ifindex == ifindex)
1362 return 0;
1363 ops = upper_dev->netdev_ops;
1364 if (ops->ndo_del_slave) {
1365 err = ops->ndo_del_slave(upper_dev, dev);
1366 if (err)
1367 return err;
1368 } else {
1369 return -EOPNOTSUPP;
1370 }
1371 }
1372
1373 if (ifindex) {
1374 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1375 if (!upper_dev)
1376 return -EINVAL;
1377 ops = upper_dev->netdev_ops;
1378 if (ops->ndo_add_slave) {
1379 err = ops->ndo_add_slave(upper_dev, dev);
1380 if (err)
1381 return err;
1382 } else {
1383 return -EOPNOTSUPP;
1384 }
1385 }
1386 return 0;
1387 }
1388
1389 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1390 struct nlattr **tb, char *ifname, int modified)
1391 {
1392 const struct net_device_ops *ops = dev->netdev_ops;
1393 int err;
1394
1395 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1396 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1397 if (IS_ERR(net)) {
1398 err = PTR_ERR(net);
1399 goto errout;
1400 }
1401 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1402 err = -EPERM;
1403 goto errout;
1404 }
1405 err = dev_change_net_namespace(dev, net, ifname);
1406 put_net(net);
1407 if (err)
1408 goto errout;
1409 modified = 1;
1410 }
1411
1412 if (tb[IFLA_MAP]) {
1413 struct rtnl_link_ifmap *u_map;
1414 struct ifmap k_map;
1415
1416 if (!ops->ndo_set_config) {
1417 err = -EOPNOTSUPP;
1418 goto errout;
1419 }
1420
1421 if (!netif_device_present(dev)) {
1422 err = -ENODEV;
1423 goto errout;
1424 }
1425
1426 u_map = nla_data(tb[IFLA_MAP]);
1427 k_map.mem_start = (unsigned long) u_map->mem_start;
1428 k_map.mem_end = (unsigned long) u_map->mem_end;
1429 k_map.base_addr = (unsigned short) u_map->base_addr;
1430 k_map.irq = (unsigned char) u_map->irq;
1431 k_map.dma = (unsigned char) u_map->dma;
1432 k_map.port = (unsigned char) u_map->port;
1433
1434 err = ops->ndo_set_config(dev, &k_map);
1435 if (err < 0)
1436 goto errout;
1437
1438 modified = 1;
1439 }
1440
1441 if (tb[IFLA_ADDRESS]) {
1442 struct sockaddr *sa;
1443 int len;
1444
1445 len = sizeof(sa_family_t) + dev->addr_len;
1446 sa = kmalloc(len, GFP_KERNEL);
1447 if (!sa) {
1448 err = -ENOMEM;
1449 goto errout;
1450 }
1451 sa->sa_family = dev->type;
1452 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1453 dev->addr_len);
1454 err = dev_set_mac_address(dev, sa);
1455 kfree(sa);
1456 if (err)
1457 goto errout;
1458 modified = 1;
1459 }
1460
1461 if (tb[IFLA_MTU]) {
1462 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1463 if (err < 0)
1464 goto errout;
1465 modified = 1;
1466 }
1467
1468 if (tb[IFLA_GROUP]) {
1469 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1470 modified = 1;
1471 }
1472
1473 /*
1474 * Interface selected by interface index but interface
1475 * name provided implies that a name change has been
1476 * requested.
1477 */
1478 if (ifm->ifi_index > 0 && ifname[0]) {
1479 err = dev_change_name(dev, ifname);
1480 if (err < 0)
1481 goto errout;
1482 modified = 1;
1483 }
1484
1485 if (tb[IFLA_IFALIAS]) {
1486 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1487 nla_len(tb[IFLA_IFALIAS]));
1488 if (err < 0)
1489 goto errout;
1490 modified = 1;
1491 }
1492
1493 if (tb[IFLA_BROADCAST]) {
1494 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1495 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1496 }
1497
1498 if (ifm->ifi_flags || ifm->ifi_change) {
1499 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1500 if (err < 0)
1501 goto errout;
1502 }
1503
1504 if (tb[IFLA_MASTER]) {
1505 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1506 if (err)
1507 goto errout;
1508 modified = 1;
1509 }
1510
1511 if (tb[IFLA_CARRIER]) {
1512 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1513 if (err)
1514 goto errout;
1515 modified = 1;
1516 }
1517
1518 if (tb[IFLA_TXQLEN])
1519 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1520
1521 if (tb[IFLA_OPERSTATE])
1522 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1523
1524 if (tb[IFLA_LINKMODE]) {
1525 write_lock_bh(&dev_base_lock);
1526 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1527 write_unlock_bh(&dev_base_lock);
1528 }
1529
1530 if (tb[IFLA_VFINFO_LIST]) {
1531 struct nlattr *attr;
1532 int rem;
1533 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1534 if (nla_type(attr) != IFLA_VF_INFO) {
1535 err = -EINVAL;
1536 goto errout;
1537 }
1538 err = do_setvfinfo(dev, attr);
1539 if (err < 0)
1540 goto errout;
1541 modified = 1;
1542 }
1543 }
1544 err = 0;
1545
1546 if (tb[IFLA_VF_PORTS]) {
1547 struct nlattr *port[IFLA_PORT_MAX+1];
1548 struct nlattr *attr;
1549 int vf;
1550 int rem;
1551
1552 err = -EOPNOTSUPP;
1553 if (!ops->ndo_set_vf_port)
1554 goto errout;
1555
1556 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1557 if (nla_type(attr) != IFLA_VF_PORT)
1558 continue;
1559 err = nla_parse_nested(port, IFLA_PORT_MAX,
1560 attr, ifla_port_policy);
1561 if (err < 0)
1562 goto errout;
1563 if (!port[IFLA_PORT_VF]) {
1564 err = -EOPNOTSUPP;
1565 goto errout;
1566 }
1567 vf = nla_get_u32(port[IFLA_PORT_VF]);
1568 err = ops->ndo_set_vf_port(dev, vf, port);
1569 if (err < 0)
1570 goto errout;
1571 modified = 1;
1572 }
1573 }
1574 err = 0;
1575
1576 if (tb[IFLA_PORT_SELF]) {
1577 struct nlattr *port[IFLA_PORT_MAX+1];
1578
1579 err = nla_parse_nested(port, IFLA_PORT_MAX,
1580 tb[IFLA_PORT_SELF], ifla_port_policy);
1581 if (err < 0)
1582 goto errout;
1583
1584 err = -EOPNOTSUPP;
1585 if (ops->ndo_set_vf_port)
1586 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1587 if (err < 0)
1588 goto errout;
1589 modified = 1;
1590 }
1591
1592 if (tb[IFLA_AF_SPEC]) {
1593 struct nlattr *af;
1594 int rem;
1595
1596 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1597 const struct rtnl_af_ops *af_ops;
1598
1599 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1600 BUG();
1601
1602 err = af_ops->set_link_af(dev, af);
1603 if (err < 0)
1604 goto errout;
1605
1606 modified = 1;
1607 }
1608 }
1609 err = 0;
1610
1611 errout:
1612 if (err < 0 && modified)
1613 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",
1614 dev->name);
1615
1616 return err;
1617 }
1618
1619 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1620 {
1621 struct net *net = sock_net(skb->sk);
1622 struct ifinfomsg *ifm;
1623 struct net_device *dev;
1624 int err;
1625 struct nlattr *tb[IFLA_MAX+1];
1626 char ifname[IFNAMSIZ];
1627
1628 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1629 if (err < 0)
1630 goto errout;
1631
1632 if (tb[IFLA_IFNAME])
1633 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1634 else
1635 ifname[0] = '\0';
1636
1637 err = -EINVAL;
1638 ifm = nlmsg_data(nlh);
1639 if (ifm->ifi_index > 0)
1640 dev = __dev_get_by_index(net, ifm->ifi_index);
1641 else if (tb[IFLA_IFNAME])
1642 dev = __dev_get_by_name(net, ifname);
1643 else
1644 goto errout;
1645
1646 if (dev == NULL) {
1647 err = -ENODEV;
1648 goto errout;
1649 }
1650
1651 err = validate_linkmsg(dev, tb);
1652 if (err < 0)
1653 goto errout;
1654
1655 err = do_setlink(dev, ifm, tb, ifname, 0);
1656 errout:
1657 return err;
1658 }
1659
1660 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1661 {
1662 struct net *net = sock_net(skb->sk);
1663 const struct rtnl_link_ops *ops;
1664 struct net_device *dev;
1665 struct ifinfomsg *ifm;
1666 char ifname[IFNAMSIZ];
1667 struct nlattr *tb[IFLA_MAX+1];
1668 int err;
1669 LIST_HEAD(list_kill);
1670
1671 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1672 if (err < 0)
1673 return err;
1674
1675 if (tb[IFLA_IFNAME])
1676 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1677
1678 ifm = nlmsg_data(nlh);
1679 if (ifm->ifi_index > 0)
1680 dev = __dev_get_by_index(net, ifm->ifi_index);
1681 else if (tb[IFLA_IFNAME])
1682 dev = __dev_get_by_name(net, ifname);
1683 else
1684 return -EINVAL;
1685
1686 if (!dev)
1687 return -ENODEV;
1688
1689 ops = dev->rtnl_link_ops;
1690 if (!ops)
1691 return -EOPNOTSUPP;
1692
1693 ops->dellink(dev, &list_kill);
1694 unregister_netdevice_many(&list_kill);
1695 list_del(&list_kill);
1696 return 0;
1697 }
1698
1699 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1700 {
1701 unsigned int old_flags;
1702 int err;
1703
1704 old_flags = dev->flags;
1705 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1706 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1707 if (err < 0)
1708 return err;
1709 }
1710
1711 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1712
1713 __dev_notify_flags(dev, old_flags, ~0U);
1714 return 0;
1715 }
1716 EXPORT_SYMBOL(rtnl_configure_link);
1717
1718 struct net_device *rtnl_create_link(struct net *net,
1719 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1720 {
1721 int err;
1722 struct net_device *dev;
1723 unsigned int num_tx_queues = 1;
1724 unsigned int num_rx_queues = 1;
1725
1726 if (tb[IFLA_NUM_TX_QUEUES])
1727 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1728 else if (ops->get_num_tx_queues)
1729 num_tx_queues = ops->get_num_tx_queues();
1730
1731 if (tb[IFLA_NUM_RX_QUEUES])
1732 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1733 else if (ops->get_num_rx_queues)
1734 num_rx_queues = ops->get_num_rx_queues();
1735
1736 err = -ENOMEM;
1737 dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup,
1738 num_tx_queues, num_rx_queues);
1739 if (!dev)
1740 goto err;
1741
1742 dev_net_set(dev, net);
1743 dev->rtnl_link_ops = ops;
1744 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1745
1746 if (tb[IFLA_MTU])
1747 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1748 if (tb[IFLA_ADDRESS]) {
1749 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1750 nla_len(tb[IFLA_ADDRESS]));
1751 dev->addr_assign_type = NET_ADDR_SET;
1752 }
1753 if (tb[IFLA_BROADCAST])
1754 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1755 nla_len(tb[IFLA_BROADCAST]));
1756 if (tb[IFLA_TXQLEN])
1757 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1758 if (tb[IFLA_OPERSTATE])
1759 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1760 if (tb[IFLA_LINKMODE])
1761 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1762 if (tb[IFLA_GROUP])
1763 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1764
1765 return dev;
1766
1767 err:
1768 return ERR_PTR(err);
1769 }
1770 EXPORT_SYMBOL(rtnl_create_link);
1771
1772 static int rtnl_group_changelink(struct net *net, int group,
1773 struct ifinfomsg *ifm,
1774 struct nlattr **tb)
1775 {
1776 struct net_device *dev;
1777 int err;
1778
1779 for_each_netdev(net, dev) {
1780 if (dev->group == group) {
1781 err = do_setlink(dev, ifm, tb, NULL, 0);
1782 if (err < 0)
1783 return err;
1784 }
1785 }
1786
1787 return 0;
1788 }
1789
1790 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1791 {
1792 struct net *net = sock_net(skb->sk);
1793 const struct rtnl_link_ops *ops;
1794 const struct rtnl_link_ops *m_ops = NULL;
1795 struct net_device *dev;
1796 struct net_device *master_dev = NULL;
1797 struct ifinfomsg *ifm;
1798 char kind[MODULE_NAME_LEN];
1799 char ifname[IFNAMSIZ];
1800 struct nlattr *tb[IFLA_MAX+1];
1801 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1802 int err;
1803
1804 #ifdef CONFIG_MODULES
1805 replay:
1806 #endif
1807 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1808 if (err < 0)
1809 return err;
1810
1811 if (tb[IFLA_IFNAME])
1812 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1813 else
1814 ifname[0] = '\0';
1815
1816 ifm = nlmsg_data(nlh);
1817 if (ifm->ifi_index > 0)
1818 dev = __dev_get_by_index(net, ifm->ifi_index);
1819 else {
1820 if (ifname[0])
1821 dev = __dev_get_by_name(net, ifname);
1822 else
1823 dev = NULL;
1824 }
1825
1826 if (dev) {
1827 master_dev = netdev_master_upper_dev_get(dev);
1828 if (master_dev)
1829 m_ops = master_dev->rtnl_link_ops;
1830 }
1831
1832 err = validate_linkmsg(dev, tb);
1833 if (err < 0)
1834 return err;
1835
1836 if (tb[IFLA_LINKINFO]) {
1837 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1838 tb[IFLA_LINKINFO], ifla_info_policy);
1839 if (err < 0)
1840 return err;
1841 } else
1842 memset(linkinfo, 0, sizeof(linkinfo));
1843
1844 if (linkinfo[IFLA_INFO_KIND]) {
1845 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1846 ops = rtnl_link_ops_get(kind);
1847 } else {
1848 kind[0] = '\0';
1849 ops = NULL;
1850 }
1851
1852 if (1) {
1853 struct nlattr *attr[ops ? ops->maxtype + 1 : 0];
1854 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 0];
1855 struct nlattr **data = NULL;
1856 struct nlattr **slave_data = NULL;
1857 struct net *dest_net;
1858
1859 if (ops) {
1860 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1861 err = nla_parse_nested(attr, ops->maxtype,
1862 linkinfo[IFLA_INFO_DATA],
1863 ops->policy);
1864 if (err < 0)
1865 return err;
1866 data = attr;
1867 }
1868 if (ops->validate) {
1869 err = ops->validate(tb, data);
1870 if (err < 0)
1871 return err;
1872 }
1873 }
1874
1875 if (m_ops) {
1876 if (m_ops->slave_maxtype &&
1877 linkinfo[IFLA_INFO_SLAVE_DATA]) {
1878 err = nla_parse_nested(slave_attr,
1879 m_ops->slave_maxtype,
1880 linkinfo[IFLA_INFO_SLAVE_DATA],
1881 m_ops->slave_policy);
1882 if (err < 0)
1883 return err;
1884 slave_data = slave_attr;
1885 }
1886 if (m_ops->slave_validate) {
1887 err = m_ops->slave_validate(tb, slave_data);
1888 if (err < 0)
1889 return err;
1890 }
1891 }
1892
1893 if (dev) {
1894 int modified = 0;
1895
1896 if (nlh->nlmsg_flags & NLM_F_EXCL)
1897 return -EEXIST;
1898 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1899 return -EOPNOTSUPP;
1900
1901 if (linkinfo[IFLA_INFO_DATA]) {
1902 if (!ops || ops != dev->rtnl_link_ops ||
1903 !ops->changelink)
1904 return -EOPNOTSUPP;
1905
1906 err = ops->changelink(dev, tb, data);
1907 if (err < 0)
1908 return err;
1909 modified = 1;
1910 }
1911
1912 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
1913 if (!m_ops || !m_ops->slave_changelink)
1914 return -EOPNOTSUPP;
1915
1916 err = m_ops->slave_changelink(master_dev, dev,
1917 tb, slave_data);
1918 if (err < 0)
1919 return err;
1920 modified = 1;
1921 }
1922
1923 return do_setlink(dev, ifm, tb, ifname, modified);
1924 }
1925
1926 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1927 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1928 return rtnl_group_changelink(net,
1929 nla_get_u32(tb[IFLA_GROUP]),
1930 ifm, tb);
1931 return -ENODEV;
1932 }
1933
1934 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1935 return -EOPNOTSUPP;
1936
1937 if (!ops) {
1938 #ifdef CONFIG_MODULES
1939 if (kind[0]) {
1940 __rtnl_unlock();
1941 request_module("rtnl-link-%s", kind);
1942 rtnl_lock();
1943 ops = rtnl_link_ops_get(kind);
1944 if (ops)
1945 goto replay;
1946 }
1947 #endif
1948 return -EOPNOTSUPP;
1949 }
1950
1951 if (!ifname[0])
1952 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1953
1954 dest_net = rtnl_link_get_net(net, tb);
1955 if (IS_ERR(dest_net))
1956 return PTR_ERR(dest_net);
1957
1958 dev = rtnl_create_link(dest_net, ifname, ops, tb);
1959 if (IS_ERR(dev)) {
1960 err = PTR_ERR(dev);
1961 goto out;
1962 }
1963
1964 dev->ifindex = ifm->ifi_index;
1965
1966 if (ops->newlink) {
1967 err = ops->newlink(net, dev, tb, data);
1968 /* Drivers should call free_netdev() in ->destructor
1969 * and unregister it on failure so that device could be
1970 * finally freed in rtnl_unlock.
1971 */
1972 if (err < 0)
1973 goto out;
1974 } else {
1975 err = register_netdevice(dev);
1976 if (err < 0) {
1977 free_netdev(dev);
1978 goto out;
1979 }
1980 }
1981 err = rtnl_configure_link(dev, ifm);
1982 if (err < 0)
1983 unregister_netdevice(dev);
1984 out:
1985 put_net(dest_net);
1986 return err;
1987 }
1988 }
1989
1990 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
1991 {
1992 struct net *net = sock_net(skb->sk);
1993 struct ifinfomsg *ifm;
1994 char ifname[IFNAMSIZ];
1995 struct nlattr *tb[IFLA_MAX+1];
1996 struct net_device *dev = NULL;
1997 struct sk_buff *nskb;
1998 int err;
1999 u32 ext_filter_mask = 0;
2000
2001 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2002 if (err < 0)
2003 return err;
2004
2005 if (tb[IFLA_IFNAME])
2006 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2007
2008 if (tb[IFLA_EXT_MASK])
2009 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2010
2011 ifm = nlmsg_data(nlh);
2012 if (ifm->ifi_index > 0)
2013 dev = __dev_get_by_index(net, ifm->ifi_index);
2014 else if (tb[IFLA_IFNAME])
2015 dev = __dev_get_by_name(net, ifname);
2016 else
2017 return -EINVAL;
2018
2019 if (dev == NULL)
2020 return -ENODEV;
2021
2022 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2023 if (nskb == NULL)
2024 return -ENOBUFS;
2025
2026 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2027 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2028 if (err < 0) {
2029 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2030 WARN_ON(err == -EMSGSIZE);
2031 kfree_skb(nskb);
2032 } else
2033 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2034
2035 return err;
2036 }
2037
2038 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2039 {
2040 struct net *net = sock_net(skb->sk);
2041 struct net_device *dev;
2042 struct nlattr *tb[IFLA_MAX+1];
2043 u32 ext_filter_mask = 0;
2044 u16 min_ifinfo_dump_size = 0;
2045
2046 if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2047 ifla_policy) >= 0) {
2048 if (tb[IFLA_EXT_MASK])
2049 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2050 }
2051
2052 if (!ext_filter_mask)
2053 return NLMSG_GOODSIZE;
2054 /*
2055 * traverse the list of net devices and compute the minimum
2056 * buffer size based upon the filter mask.
2057 */
2058 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2059 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2060 if_nlmsg_size(dev,
2061 ext_filter_mask));
2062 }
2063
2064 return min_ifinfo_dump_size;
2065 }
2066
2067 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2068 {
2069 int idx;
2070 int s_idx = cb->family;
2071
2072 if (s_idx == 0)
2073 s_idx = 1;
2074 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2075 int type = cb->nlh->nlmsg_type-RTM_BASE;
2076 if (idx < s_idx || idx == PF_PACKET)
2077 continue;
2078 if (rtnl_msg_handlers[idx] == NULL ||
2079 rtnl_msg_handlers[idx][type].dumpit == NULL)
2080 continue;
2081 if (idx > s_idx) {
2082 memset(&cb->args[0], 0, sizeof(cb->args));
2083 cb->prev_seq = 0;
2084 cb->seq = 0;
2085 }
2086 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2087 break;
2088 }
2089 cb->family = idx;
2090
2091 return skb->len;
2092 }
2093
2094 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2095 gfp_t flags)
2096 {
2097 struct net *net = dev_net(dev);
2098 struct sk_buff *skb;
2099 int err = -ENOBUFS;
2100 size_t if_info_size;
2101
2102 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2103 if (skb == NULL)
2104 goto errout;
2105
2106 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2107 if (err < 0) {
2108 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2109 WARN_ON(err == -EMSGSIZE);
2110 kfree_skb(skb);
2111 goto errout;
2112 }
2113 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2114 return;
2115 errout:
2116 if (err < 0)
2117 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2118 }
2119 EXPORT_SYMBOL(rtmsg_ifinfo);
2120
2121 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2122 struct net_device *dev,
2123 u8 *addr, u32 pid, u32 seq,
2124 int type, unsigned int flags)
2125 {
2126 struct nlmsghdr *nlh;
2127 struct ndmsg *ndm;
2128
2129 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI);
2130 if (!nlh)
2131 return -EMSGSIZE;
2132
2133 ndm = nlmsg_data(nlh);
2134 ndm->ndm_family = AF_BRIDGE;
2135 ndm->ndm_pad1 = 0;
2136 ndm->ndm_pad2 = 0;
2137 ndm->ndm_flags = flags;
2138 ndm->ndm_type = 0;
2139 ndm->ndm_ifindex = dev->ifindex;
2140 ndm->ndm_state = NUD_PERMANENT;
2141
2142 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2143 goto nla_put_failure;
2144
2145 return nlmsg_end(skb, nlh);
2146
2147 nla_put_failure:
2148 nlmsg_cancel(skb, nlh);
2149 return -EMSGSIZE;
2150 }
2151
2152 static inline size_t rtnl_fdb_nlmsg_size(void)
2153 {
2154 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2155 }
2156
2157 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2158 {
2159 struct net *net = dev_net(dev);
2160 struct sk_buff *skb;
2161 int err = -ENOBUFS;
2162
2163 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2164 if (!skb)
2165 goto errout;
2166
2167 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF);
2168 if (err < 0) {
2169 kfree_skb(skb);
2170 goto errout;
2171 }
2172
2173 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2174 return;
2175 errout:
2176 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2177 }
2178
2179 /**
2180 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2181 */
2182 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2183 struct nlattr *tb[],
2184 struct net_device *dev,
2185 const unsigned char *addr,
2186 u16 flags)
2187 {
2188 int err = -EINVAL;
2189
2190 /* If aging addresses are supported device will need to
2191 * implement its own handler for this.
2192 */
2193 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2194 pr_info("%s: FDB only supports static addresses\n", dev->name);
2195 return err;
2196 }
2197
2198 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2199 err = dev_uc_add_excl(dev, addr);
2200 else if (is_multicast_ether_addr(addr))
2201 err = dev_mc_add_excl(dev, addr);
2202
2203 /* Only return duplicate errors if NLM_F_EXCL is set */
2204 if (err == -EEXIST && !(flags & NLM_F_EXCL))
2205 err = 0;
2206
2207 return err;
2208 }
2209 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2210
2211 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2212 {
2213 struct net *net = sock_net(skb->sk);
2214 struct ndmsg *ndm;
2215 struct nlattr *tb[NDA_MAX+1];
2216 struct net_device *dev;
2217 u8 *addr;
2218 int err;
2219
2220 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2221 if (err < 0)
2222 return err;
2223
2224 ndm = nlmsg_data(nlh);
2225 if (ndm->ndm_ifindex == 0) {
2226 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2227 return -EINVAL;
2228 }
2229
2230 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2231 if (dev == NULL) {
2232 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2233 return -ENODEV;
2234 }
2235
2236 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2237 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2238 return -EINVAL;
2239 }
2240
2241 addr = nla_data(tb[NDA_LLADDR]);
2242
2243 err = -EOPNOTSUPP;
2244
2245 /* Support fdb on master device the net/bridge default case */
2246 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2247 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2248 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2249 const struct net_device_ops *ops = br_dev->netdev_ops;
2250
2251 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2252 if (err)
2253 goto out;
2254 else
2255 ndm->ndm_flags &= ~NTF_MASTER;
2256 }
2257
2258 /* Embedded bridge, macvlan, and any other device support */
2259 if ((ndm->ndm_flags & NTF_SELF)) {
2260 if (dev->netdev_ops->ndo_fdb_add)
2261 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2262 nlh->nlmsg_flags);
2263 else
2264 err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2265 nlh->nlmsg_flags);
2266
2267 if (!err) {
2268 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2269 ndm->ndm_flags &= ~NTF_SELF;
2270 }
2271 }
2272 out:
2273 return err;
2274 }
2275
2276 /**
2277 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2278 */
2279 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2280 struct nlattr *tb[],
2281 struct net_device *dev,
2282 const unsigned char *addr)
2283 {
2284 int err = -EOPNOTSUPP;
2285
2286 /* If aging addresses are supported device will need to
2287 * implement its own handler for this.
2288 */
2289 if (!(ndm->ndm_state & NUD_PERMANENT)) {
2290 pr_info("%s: FDB only supports static addresses\n", dev->name);
2291 return -EINVAL;
2292 }
2293
2294 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2295 err = dev_uc_del(dev, addr);
2296 else if (is_multicast_ether_addr(addr))
2297 err = dev_mc_del(dev, addr);
2298 else
2299 err = -EINVAL;
2300
2301 return err;
2302 }
2303 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2304
2305 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2306 {
2307 struct net *net = sock_net(skb->sk);
2308 struct ndmsg *ndm;
2309 struct nlattr *tb[NDA_MAX+1];
2310 struct net_device *dev;
2311 int err = -EINVAL;
2312 __u8 *addr;
2313
2314 if (!capable(CAP_NET_ADMIN))
2315 return -EPERM;
2316
2317 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2318 if (err < 0)
2319 return err;
2320
2321 ndm = nlmsg_data(nlh);
2322 if (ndm->ndm_ifindex == 0) {
2323 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2324 return -EINVAL;
2325 }
2326
2327 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2328 if (dev == NULL) {
2329 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2330 return -ENODEV;
2331 }
2332
2333 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2334 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2335 return -EINVAL;
2336 }
2337
2338 addr = nla_data(tb[NDA_LLADDR]);
2339
2340 err = -EOPNOTSUPP;
2341
2342 /* Support fdb on master device the net/bridge default case */
2343 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2344 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2345 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2346 const struct net_device_ops *ops = br_dev->netdev_ops;
2347
2348 if (ops->ndo_fdb_del)
2349 err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2350
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_del)
2360 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2361 else
2362 err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2363
2364 if (!err) {
2365 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2366 ndm->ndm_flags &= ~NTF_SELF;
2367 }
2368 }
2369 out:
2370 return err;
2371 }
2372
2373 static int nlmsg_populate_fdb(struct sk_buff *skb,
2374 struct netlink_callback *cb,
2375 struct net_device *dev,
2376 int *idx,
2377 struct netdev_hw_addr_list *list)
2378 {
2379 struct netdev_hw_addr *ha;
2380 int err;
2381 u32 portid, seq;
2382
2383 portid = NETLINK_CB(cb->skb).portid;
2384 seq = cb->nlh->nlmsg_seq;
2385
2386 list_for_each_entry(ha, &list->list, list) {
2387 if (*idx < cb->args[0])
2388 goto skip;
2389
2390 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2391 portid, seq,
2392 RTM_NEWNEIGH, NTF_SELF);
2393 if (err < 0)
2394 return err;
2395 skip:
2396 *idx += 1;
2397 }
2398 return 0;
2399 }
2400
2401 /**
2402 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2403 * @nlh: netlink message header
2404 * @dev: netdevice
2405 *
2406 * Default netdevice operation to dump the existing unicast address list.
2407 * Returns number of addresses from list put in skb.
2408 */
2409 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2410 struct netlink_callback *cb,
2411 struct net_device *dev,
2412 int idx)
2413 {
2414 int err;
2415
2416 netif_addr_lock_bh(dev);
2417 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2418 if (err)
2419 goto out;
2420 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2421 out:
2422 netif_addr_unlock_bh(dev);
2423 return idx;
2424 }
2425 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2426
2427 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2428 {
2429 int idx = 0;
2430 struct net *net = sock_net(skb->sk);
2431 struct net_device *dev;
2432
2433 rcu_read_lock();
2434 for_each_netdev_rcu(net, dev) {
2435 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2436 struct net_device *br_dev;
2437 const struct net_device_ops *ops;
2438
2439 br_dev = netdev_master_upper_dev_get(dev);
2440 ops = br_dev->netdev_ops;
2441 if (ops->ndo_fdb_dump)
2442 idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
2443 }
2444
2445 if (dev->netdev_ops->ndo_fdb_dump)
2446 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
2447 else
2448 idx = ndo_dflt_fdb_dump(skb, cb, dev, idx);
2449 }
2450 rcu_read_unlock();
2451
2452 cb->args[0] = idx;
2453 return skb->len;
2454 }
2455
2456 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2457 struct net_device *dev, u16 mode)
2458 {
2459 struct nlmsghdr *nlh;
2460 struct ifinfomsg *ifm;
2461 struct nlattr *br_afspec;
2462 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2463 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2464
2465 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2466 if (nlh == NULL)
2467 return -EMSGSIZE;
2468
2469 ifm = nlmsg_data(nlh);
2470 ifm->ifi_family = AF_BRIDGE;
2471 ifm->__ifi_pad = 0;
2472 ifm->ifi_type = dev->type;
2473 ifm->ifi_index = dev->ifindex;
2474 ifm->ifi_flags = dev_get_flags(dev);
2475 ifm->ifi_change = 0;
2476
2477
2478 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2479 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2480 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2481 (br_dev &&
2482 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2483 (dev->addr_len &&
2484 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2485 (dev->ifindex != dev->iflink &&
2486 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2487 goto nla_put_failure;
2488
2489 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2490 if (!br_afspec)
2491 goto nla_put_failure;
2492
2493 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2494 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2495 nla_nest_cancel(skb, br_afspec);
2496 goto nla_put_failure;
2497 }
2498 nla_nest_end(skb, br_afspec);
2499
2500 return nlmsg_end(skb, nlh);
2501 nla_put_failure:
2502 nlmsg_cancel(skb, nlh);
2503 return -EMSGSIZE;
2504 }
2505 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2506
2507 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2508 {
2509 struct net *net = sock_net(skb->sk);
2510 struct net_device *dev;
2511 int idx = 0;
2512 u32 portid = NETLINK_CB(cb->skb).portid;
2513 u32 seq = cb->nlh->nlmsg_seq;
2514 struct nlattr *extfilt;
2515 u32 filter_mask = 0;
2516
2517 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2518 IFLA_EXT_MASK);
2519 if (extfilt)
2520 filter_mask = nla_get_u32(extfilt);
2521
2522 rcu_read_lock();
2523 for_each_netdev_rcu(net, dev) {
2524 const struct net_device_ops *ops = dev->netdev_ops;
2525 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2526
2527 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2528 if (idx >= cb->args[0] &&
2529 br_dev->netdev_ops->ndo_bridge_getlink(
2530 skb, portid, seq, dev, filter_mask) < 0)
2531 break;
2532 idx++;
2533 }
2534
2535 if (ops->ndo_bridge_getlink) {
2536 if (idx >= cb->args[0] &&
2537 ops->ndo_bridge_getlink(skb, portid, seq, dev,
2538 filter_mask) < 0)
2539 break;
2540 idx++;
2541 }
2542 }
2543 rcu_read_unlock();
2544 cb->args[0] = idx;
2545
2546 return skb->len;
2547 }
2548
2549 static inline size_t bridge_nlmsg_size(void)
2550 {
2551 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2552 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
2553 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
2554 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
2555 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
2556 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
2557 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
2558 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
2559 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2560 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
2561 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
2562 }
2563
2564 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2565 {
2566 struct net *net = dev_net(dev);
2567 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2568 struct sk_buff *skb;
2569 int err = -EOPNOTSUPP;
2570
2571 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2572 if (!skb) {
2573 err = -ENOMEM;
2574 goto errout;
2575 }
2576
2577 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2578 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2579 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2580 if (err < 0)
2581 goto errout;
2582 }
2583
2584 if ((flags & BRIDGE_FLAGS_SELF) &&
2585 dev->netdev_ops->ndo_bridge_getlink) {
2586 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2587 if (err < 0)
2588 goto errout;
2589 }
2590
2591 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2592 return 0;
2593 errout:
2594 WARN_ON(err == -EMSGSIZE);
2595 kfree_skb(skb);
2596 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2597 return err;
2598 }
2599
2600 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2601 {
2602 struct net *net = sock_net(skb->sk);
2603 struct ifinfomsg *ifm;
2604 struct net_device *dev;
2605 struct nlattr *br_spec, *attr = NULL;
2606 int rem, err = -EOPNOTSUPP;
2607 u16 oflags, flags = 0;
2608 bool have_flags = false;
2609
2610 if (nlmsg_len(nlh) < sizeof(*ifm))
2611 return -EINVAL;
2612
2613 ifm = nlmsg_data(nlh);
2614 if (ifm->ifi_family != AF_BRIDGE)
2615 return -EPFNOSUPPORT;
2616
2617 dev = __dev_get_by_index(net, ifm->ifi_index);
2618 if (!dev) {
2619 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2620 return -ENODEV;
2621 }
2622
2623 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2624 if (br_spec) {
2625 nla_for_each_nested(attr, br_spec, rem) {
2626 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2627 have_flags = true;
2628 flags = nla_get_u16(attr);
2629 break;
2630 }
2631 }
2632 }
2633
2634 oflags = flags;
2635
2636 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2637 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2638
2639 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2640 err = -EOPNOTSUPP;
2641 goto out;
2642 }
2643
2644 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2645 if (err)
2646 goto out;
2647
2648 flags &= ~BRIDGE_FLAGS_MASTER;
2649 }
2650
2651 if ((flags & BRIDGE_FLAGS_SELF)) {
2652 if (!dev->netdev_ops->ndo_bridge_setlink)
2653 err = -EOPNOTSUPP;
2654 else
2655 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2656
2657 if (!err)
2658 flags &= ~BRIDGE_FLAGS_SELF;
2659 }
2660
2661 if (have_flags)
2662 memcpy(nla_data(attr), &flags, sizeof(flags));
2663 /* Generate event to notify upper layer of bridge change */
2664 if (!err)
2665 err = rtnl_bridge_notify(dev, oflags);
2666 out:
2667 return err;
2668 }
2669
2670 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2671 {
2672 struct net *net = sock_net(skb->sk);
2673 struct ifinfomsg *ifm;
2674 struct net_device *dev;
2675 struct nlattr *br_spec, *attr = NULL;
2676 int rem, err = -EOPNOTSUPP;
2677 u16 oflags, flags = 0;
2678 bool have_flags = false;
2679
2680 if (nlmsg_len(nlh) < sizeof(*ifm))
2681 return -EINVAL;
2682
2683 ifm = nlmsg_data(nlh);
2684 if (ifm->ifi_family != AF_BRIDGE)
2685 return -EPFNOSUPPORT;
2686
2687 dev = __dev_get_by_index(net, ifm->ifi_index);
2688 if (!dev) {
2689 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2690 return -ENODEV;
2691 }
2692
2693 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2694 if (br_spec) {
2695 nla_for_each_nested(attr, br_spec, rem) {
2696 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2697 have_flags = true;
2698 flags = nla_get_u16(attr);
2699 break;
2700 }
2701 }
2702 }
2703
2704 oflags = flags;
2705
2706 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2707 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2708
2709 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2710 err = -EOPNOTSUPP;
2711 goto out;
2712 }
2713
2714 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2715 if (err)
2716 goto out;
2717
2718 flags &= ~BRIDGE_FLAGS_MASTER;
2719 }
2720
2721 if ((flags & BRIDGE_FLAGS_SELF)) {
2722 if (!dev->netdev_ops->ndo_bridge_dellink)
2723 err = -EOPNOTSUPP;
2724 else
2725 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2726
2727 if (!err)
2728 flags &= ~BRIDGE_FLAGS_SELF;
2729 }
2730
2731 if (have_flags)
2732 memcpy(nla_data(attr), &flags, sizeof(flags));
2733 /* Generate event to notify upper layer of bridge change */
2734 if (!err)
2735 err = rtnl_bridge_notify(dev, oflags);
2736 out:
2737 return err;
2738 }
2739
2740 /* Process one rtnetlink message. */
2741
2742 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2743 {
2744 struct net *net = sock_net(skb->sk);
2745 rtnl_doit_func doit;
2746 int sz_idx, kind;
2747 int family;
2748 int type;
2749 int err;
2750
2751 type = nlh->nlmsg_type;
2752 if (type > RTM_MAX)
2753 return -EOPNOTSUPP;
2754
2755 type -= RTM_BASE;
2756
2757 /* All the messages must have at least 1 byte length */
2758 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2759 return 0;
2760
2761 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2762 sz_idx = type>>2;
2763 kind = type&3;
2764
2765 if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN))
2766 return -EPERM;
2767
2768 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2769 struct sock *rtnl;
2770 rtnl_dumpit_func dumpit;
2771 rtnl_calcit_func calcit;
2772 u16 min_dump_alloc = 0;
2773
2774 dumpit = rtnl_get_dumpit(family, type);
2775 if (dumpit == NULL)
2776 return -EOPNOTSUPP;
2777 calcit = rtnl_get_calcit(family, type);
2778 if (calcit)
2779 min_dump_alloc = calcit(skb, nlh);
2780
2781 __rtnl_unlock();
2782 rtnl = net->rtnl;
2783 {
2784 struct netlink_dump_control c = {
2785 .dump = dumpit,
2786 .min_dump_alloc = min_dump_alloc,
2787 };
2788 err = netlink_dump_start(rtnl, skb, nlh, &c);
2789 }
2790 rtnl_lock();
2791 return err;
2792 }
2793
2794 doit = rtnl_get_doit(family, type);
2795 if (doit == NULL)
2796 return -EOPNOTSUPP;
2797
2798 return doit(skb, nlh);
2799 }
2800
2801 static void rtnetlink_rcv(struct sk_buff *skb)
2802 {
2803 rtnl_lock();
2804 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2805 rtnl_unlock();
2806 }
2807
2808 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2809 {
2810 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2811
2812 switch (event) {
2813 case NETDEV_UP:
2814 case NETDEV_DOWN:
2815 case NETDEV_PRE_UP:
2816 case NETDEV_POST_INIT:
2817 case NETDEV_REGISTER:
2818 case NETDEV_CHANGE:
2819 case NETDEV_PRE_TYPE_CHANGE:
2820 case NETDEV_GOING_DOWN:
2821 case NETDEV_UNREGISTER:
2822 case NETDEV_UNREGISTER_FINAL:
2823 case NETDEV_RELEASE:
2824 case NETDEV_JOIN:
2825 break;
2826 default:
2827 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
2828 break;
2829 }
2830 return NOTIFY_DONE;
2831 }
2832
2833 static struct notifier_block rtnetlink_dev_notifier = {
2834 .notifier_call = rtnetlink_event,
2835 };
2836
2837
2838 static int __net_init rtnetlink_net_init(struct net *net)
2839 {
2840 struct sock *sk;
2841 struct netlink_kernel_cfg cfg = {
2842 .groups = RTNLGRP_MAX,
2843 .input = rtnetlink_rcv,
2844 .cb_mutex = &rtnl_mutex,
2845 .flags = NL_CFG_F_NONROOT_RECV,
2846 };
2847
2848 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
2849 if (!sk)
2850 return -ENOMEM;
2851 net->rtnl = sk;
2852 return 0;
2853 }
2854
2855 static void __net_exit rtnetlink_net_exit(struct net *net)
2856 {
2857 netlink_kernel_release(net->rtnl);
2858 net->rtnl = NULL;
2859 }
2860
2861 static struct pernet_operations rtnetlink_net_ops = {
2862 .init = rtnetlink_net_init,
2863 .exit = rtnetlink_net_exit,
2864 };
2865
2866 void __init rtnetlink_init(void)
2867 {
2868 if (register_pernet_subsys(&rtnetlink_net_ops))
2869 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2870
2871 register_netdevice_notifier(&rtnetlink_dev_notifier);
2872
2873 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2874 rtnl_dump_ifinfo, rtnl_calcit);
2875 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2876 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2877 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2878
2879 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2880 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2881
2882 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
2883 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
2884 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
2885
2886 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
2887 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
2888 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
2889 }
2890
Linux kernel - Deliverables
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