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mm: Initialize error in shmem_file_aio_read()
[linux/fpc-iii.git] / net / core / rtnetlink.c
blobd4ff41739b0f23fcb572905dd34288cb1d8ebd49
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(4) /* IFLA_CARRIER_CHANGES */
826 + nla_total_size(ext_filter_mask
827 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
828 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
829 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
830 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
831 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
832 + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */
833 }
834
835 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
836 {
837 struct nlattr *vf_ports;
838 struct nlattr *vf_port;
839 int vf;
840 int err;
841
842 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
843 if (!vf_ports)
844 return -EMSGSIZE;
845
846 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
847 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
848 if (!vf_port)
849 goto nla_put_failure;
850 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
851 goto nla_put_failure;
852 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
853 if (err == -EMSGSIZE)
854 goto nla_put_failure;
855 if (err) {
856 nla_nest_cancel(skb, vf_port);
857 continue;
858 }
859 nla_nest_end(skb, vf_port);
860 }
861
862 nla_nest_end(skb, vf_ports);
863
864 return 0;
865
866 nla_put_failure:
867 nla_nest_cancel(skb, vf_ports);
868 return -EMSGSIZE;
869 }
870
871 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
872 {
873 struct nlattr *port_self;
874 int err;
875
876 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
877 if (!port_self)
878 return -EMSGSIZE;
879
880 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
881 if (err) {
882 nla_nest_cancel(skb, port_self);
883 return (err == -EMSGSIZE) ? err : 0;
884 }
885
886 nla_nest_end(skb, port_self);
887
888 return 0;
889 }
890
891 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
892 {
893 int err;
894
895 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
896 return 0;
897
898 err = rtnl_port_self_fill(skb, dev);
899 if (err)
900 return err;
901
902 if (dev_num_vf(dev->dev.parent)) {
903 err = rtnl_vf_ports_fill(skb, dev);
904 if (err)
905 return err;
906 }
907
908 return 0;
909 }
910
911 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
912 {
913 int err;
914 struct netdev_phys_port_id ppid;
915
916 err = dev_get_phys_port_id(dev, &ppid);
917 if (err) {
918 if (err == -EOPNOTSUPP)
919 return 0;
920 return err;
921 }
922
923 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
924 return -EMSGSIZE;
925
926 return 0;
927 }
928
929 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
930 int type, u32 pid, u32 seq, u32 change,
931 unsigned int flags, u32 ext_filter_mask)
932 {
933 struct ifinfomsg *ifm;
934 struct nlmsghdr *nlh;
935 struct rtnl_link_stats64 temp;
936 const struct rtnl_link_stats64 *stats;
937 struct nlattr *attr, *af_spec;
938 struct rtnl_af_ops *af_ops;
939 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
940
941 ASSERT_RTNL();
942 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
943 if (nlh == NULL)
944 return -EMSGSIZE;
945
946 ifm = nlmsg_data(nlh);
947 ifm->ifi_family = AF_UNSPEC;
948 ifm->__ifi_pad = 0;
949 ifm->ifi_type = dev->type;
950 ifm->ifi_index = dev->ifindex;
951 ifm->ifi_flags = dev_get_flags(dev);
952 ifm->ifi_change = change;
953
954 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
955 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
956 nla_put_u8(skb, IFLA_OPERSTATE,
957 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
958 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
959 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
960 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
961 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
962 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
963 #ifdef CONFIG_RPS
964 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
965 #endif
966 (dev->ifindex != dev->iflink &&
967 nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
968 (upper_dev &&
969 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
970 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
971 (dev->qdisc &&
972 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
973 (dev->ifalias &&
974 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
975 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
976 atomic_read(&dev->carrier_changes)))
977 goto nla_put_failure;
978
979 if (1) {
980 struct rtnl_link_ifmap map = {
981 .mem_start = dev->mem_start,
982 .mem_end = dev->mem_end,
983 .base_addr = dev->base_addr,
984 .irq = dev->irq,
985 .dma = dev->dma,
986 .port = dev->if_port,
987 };
988 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
989 goto nla_put_failure;
990 }
991
992 if (dev->addr_len) {
993 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
994 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
995 goto nla_put_failure;
996 }
997
998 if (rtnl_phys_port_id_fill(skb, dev))
999 goto nla_put_failure;
1000
1001 attr = nla_reserve(skb, IFLA_STATS,
1002 sizeof(struct rtnl_link_stats));
1003 if (attr == NULL)
1004 goto nla_put_failure;
1005
1006 stats = dev_get_stats(dev, &temp);
1007 copy_rtnl_link_stats(nla_data(attr), stats);
1008
1009 attr = nla_reserve(skb, IFLA_STATS64,
1010 sizeof(struct rtnl_link_stats64));
1011 if (attr == NULL)
1012 goto nla_put_failure;
1013 copy_rtnl_link_stats64(nla_data(attr), stats);
1014
1015 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1016 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1017 goto nla_put_failure;
1018
1019 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1020 && (ext_filter_mask & RTEXT_FILTER_VF)) {
1021 int i;
1022
1023 struct nlattr *vfinfo, *vf;
1024 int num_vfs = dev_num_vf(dev->dev.parent);
1025
1026 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1027 if (!vfinfo)
1028 goto nla_put_failure;
1029 for (i = 0; i < num_vfs; i++) {
1030 struct ifla_vf_info ivi;
1031 struct ifla_vf_mac vf_mac;
1032 struct ifla_vf_vlan vf_vlan;
1033 struct ifla_vf_tx_rate vf_tx_rate;
1034 struct ifla_vf_spoofchk vf_spoofchk;
1035 struct ifla_vf_link_state vf_linkstate;
1036
1037 /*
1038 * Not all SR-IOV capable drivers support the
1039 * spoofcheck query. Preset to -1 so the user
1040 * space tool can detect that the driver didn't
1041 * report anything.
1042 */
1043 ivi.spoofchk = -1;
1044 memset(ivi.mac, 0, sizeof(ivi.mac));
1045 /* The default value for VF link state is "auto"
1046 * IFLA_VF_LINK_STATE_AUTO which equals zero
1047 */
1048 ivi.linkstate = 0;
1049 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1050 break;
1051 vf_mac.vf =
1052 vf_vlan.vf =
1053 vf_tx_rate.vf =
1054 vf_spoofchk.vf =
1055 vf_linkstate.vf = ivi.vf;
1056
1057 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1058 vf_vlan.vlan = ivi.vlan;
1059 vf_vlan.qos = ivi.qos;
1060 vf_tx_rate.rate = ivi.tx_rate;
1061 vf_spoofchk.setting = ivi.spoofchk;
1062 vf_linkstate.link_state = ivi.linkstate;
1063 vf = nla_nest_start(skb, IFLA_VF_INFO);
1064 if (!vf) {
1065 nla_nest_cancel(skb, vfinfo);
1066 goto nla_put_failure;
1067 }
1068 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1069 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1070 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1071 &vf_tx_rate) ||
1072 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1073 &vf_spoofchk) ||
1074 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1075 &vf_linkstate))
1076 goto nla_put_failure;
1077 nla_nest_end(skb, vf);
1078 }
1079 nla_nest_end(skb, vfinfo);
1080 }
1081
1082 if (rtnl_port_fill(skb, dev))
1083 goto nla_put_failure;
1084
1085 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1086 if (rtnl_link_fill(skb, dev) < 0)
1087 goto nla_put_failure;
1088 }
1089
1090 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1091 goto nla_put_failure;
1092
1093 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1094 if (af_ops->fill_link_af) {
1095 struct nlattr *af;
1096 int err;
1097
1098 if (!(af = nla_nest_start(skb, af_ops->family)))
1099 goto nla_put_failure;
1100
1101 err = af_ops->fill_link_af(skb, dev);
1102
1103 /*
1104 * Caller may return ENODATA to indicate that there
1105 * was no data to be dumped. This is not an error, it
1106 * means we should trim the attribute header and
1107 * continue.
1108 */
1109 if (err == -ENODATA)
1110 nla_nest_cancel(skb, af);
1111 else if (err < 0)
1112 goto nla_put_failure;
1113
1114 nla_nest_end(skb, af);
1115 }
1116 }
1117
1118 nla_nest_end(skb, af_spec);
1119
1120 return nlmsg_end(skb, nlh);
1121
1122 nla_put_failure:
1123 nlmsg_cancel(skb, nlh);
1124 return -EMSGSIZE;
1125 }
1126
1127 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1128 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1129 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1130 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1131 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1132 [IFLA_MTU] = { .type = NLA_U32 },
1133 [IFLA_LINK] = { .type = NLA_U32 },
1134 [IFLA_MASTER] = { .type = NLA_U32 },
1135 [IFLA_CARRIER] = { .type = NLA_U8 },
1136 [IFLA_TXQLEN] = { .type = NLA_U32 },
1137 [IFLA_WEIGHT] = { .type = NLA_U32 },
1138 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1139 [IFLA_LINKMODE] = { .type = NLA_U8 },
1140 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1141 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1142 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1143 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1144 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1145 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1146 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1147 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1148 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1149 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1150 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1151 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1152 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
1153 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1154 };
1155
1156 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1157 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1158 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1159 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1160 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1161 };
1162
1163 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1164 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1165 };
1166
1167 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1168 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1169 .len = sizeof(struct ifla_vf_mac) },
1170 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1171 .len = sizeof(struct ifla_vf_vlan) },
1172 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1173 .len = sizeof(struct ifla_vf_tx_rate) },
1174 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY,
1175 .len = sizeof(struct ifla_vf_spoofchk) },
1176 };
1177
1178 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1179 [IFLA_PORT_VF] = { .type = NLA_U32 },
1180 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1181 .len = PORT_PROFILE_MAX },
1182 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1183 .len = sizeof(struct ifla_port_vsi)},
1184 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1185 .len = PORT_UUID_MAX },
1186 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1187 .len = PORT_UUID_MAX },
1188 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1189 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1190 };
1191
1192 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1193 {
1194 struct net *net = sock_net(skb->sk);
1195 int h, s_h;
1196 int idx = 0, s_idx;
1197 struct net_device *dev;
1198 struct hlist_head *head;
1199 struct nlattr *tb[IFLA_MAX+1];
1200 u32 ext_filter_mask = 0;
1201
1202 s_h = cb->args[0];
1203 s_idx = cb->args[1];
1204
1205 rcu_read_lock();
1206 cb->seq = net->dev_base_seq;
1207
1208 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1209 ifla_policy) >= 0) {
1210
1211 if (tb[IFLA_EXT_MASK])
1212 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1213 }
1214
1215 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1216 idx = 0;
1217 head = &net->dev_index_head[h];
1218 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1219 if (idx < s_idx)
1220 goto cont;
1221 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1222 NETLINK_CB(cb->skb).portid,
1223 cb->nlh->nlmsg_seq, 0,
1224 NLM_F_MULTI,
1225 ext_filter_mask) <= 0)
1226 goto out;
1227
1228 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1229 cont:
1230 idx++;
1231 }
1232 }
1233 out:
1234 rcu_read_unlock();
1235 cb->args[1] = idx;
1236 cb->args[0] = h;
1237
1238 return skb->len;
1239 }
1240
1241 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1242 {
1243 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1244 }
1245 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1246
1247 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1248 {
1249 struct net *net;
1250 /* Examine the link attributes and figure out which
1251 * network namespace we are talking about.
1252 */
1253 if (tb[IFLA_NET_NS_PID])
1254 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1255 else if (tb[IFLA_NET_NS_FD])
1256 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1257 else
1258 net = get_net(src_net);
1259 return net;
1260 }
1261 EXPORT_SYMBOL(rtnl_link_get_net);
1262
1263 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1264 {
1265 if (dev) {
1266 if (tb[IFLA_ADDRESS] &&
1267 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1268 return -EINVAL;
1269
1270 if (tb[IFLA_BROADCAST] &&
1271 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1272 return -EINVAL;
1273 }
1274
1275 if (tb[IFLA_AF_SPEC]) {
1276 struct nlattr *af;
1277 int rem, err;
1278
1279 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1280 const struct rtnl_af_ops *af_ops;
1281
1282 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1283 return -EAFNOSUPPORT;
1284
1285 if (!af_ops->set_link_af)
1286 return -EOPNOTSUPP;
1287
1288 if (af_ops->validate_link_af) {
1289 err = af_ops->validate_link_af(dev, af);
1290 if (err < 0)
1291 return err;
1292 }
1293 }
1294 }
1295
1296 return 0;
1297 }
1298
1299 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1300 {
1301 int rem, err = -EINVAL;
1302 struct nlattr *vf;
1303 const struct net_device_ops *ops = dev->netdev_ops;
1304
1305 nla_for_each_nested(vf, attr, rem) {
1306 switch (nla_type(vf)) {
1307 case IFLA_VF_MAC: {
1308 struct ifla_vf_mac *ivm;
1309 ivm = nla_data(vf);
1310 err = -EOPNOTSUPP;
1311 if (ops->ndo_set_vf_mac)
1312 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1313 ivm->mac);
1314 break;
1315 }
1316 case IFLA_VF_VLAN: {
1317 struct ifla_vf_vlan *ivv;
1318 ivv = nla_data(vf);
1319 err = -EOPNOTSUPP;
1320 if (ops->ndo_set_vf_vlan)
1321 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1322 ivv->vlan,
1323 ivv->qos);
1324 break;
1325 }
1326 case IFLA_VF_TX_RATE: {
1327 struct ifla_vf_tx_rate *ivt;
1328 ivt = nla_data(vf);
1329 err = -EOPNOTSUPP;
1330 if (ops->ndo_set_vf_tx_rate)
1331 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1332 ivt->rate);
1333 break;
1334 }
1335 case IFLA_VF_SPOOFCHK: {
1336 struct ifla_vf_spoofchk *ivs;
1337 ivs = nla_data(vf);
1338 err = -EOPNOTSUPP;
1339 if (ops->ndo_set_vf_spoofchk)
1340 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1341 ivs->setting);
1342 break;
1343 }
1344 case IFLA_VF_LINK_STATE: {
1345 struct ifla_vf_link_state *ivl;
1346 ivl = nla_data(vf);
1347 err = -EOPNOTSUPP;
1348 if (ops->ndo_set_vf_link_state)
1349 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1350 ivl->link_state);
1351 break;
1352 }
1353 default:
1354 err = -EINVAL;
1355 break;
1356 }
1357 if (err)
1358 break;
1359 }
1360 return err;
1361 }
1362
1363 static int do_set_master(struct net_device *dev, int ifindex)
1364 {
1365 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1366 const struct net_device_ops *ops;
1367 int err;
1368
1369 if (upper_dev) {
1370 if (upper_dev->ifindex == ifindex)
1371 return 0;
1372 ops = upper_dev->netdev_ops;
1373 if (ops->ndo_del_slave) {
1374 err = ops->ndo_del_slave(upper_dev, dev);
1375 if (err)
1376 return err;
1377 } else {
1378 return -EOPNOTSUPP;
1379 }
1380 }
1381
1382 if (ifindex) {
1383 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1384 if (!upper_dev)
1385 return -EINVAL;
1386 ops = upper_dev->netdev_ops;
1387 if (ops->ndo_add_slave) {
1388 err = ops->ndo_add_slave(upper_dev, dev);
1389 if (err)
1390 return err;
1391 } else {
1392 return -EOPNOTSUPP;
1393 }
1394 }
1395 return 0;
1396 }
1397
1398 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1399 struct nlattr **tb, char *ifname, int modified)
1400 {
1401 const struct net_device_ops *ops = dev->netdev_ops;
1402 int err;
1403
1404 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1405 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1406 if (IS_ERR(net)) {
1407 err = PTR_ERR(net);
1408 goto errout;
1409 }
1410 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1411 err = -EPERM;
1412 goto errout;
1413 }
1414 err = dev_change_net_namespace(dev, net, ifname);
1415 put_net(net);
1416 if (err)
1417 goto errout;
1418 modified = 1;
1419 }
1420
1421 if (tb[IFLA_MAP]) {
1422 struct rtnl_link_ifmap *u_map;
1423 struct ifmap k_map;
1424
1425 if (!ops->ndo_set_config) {
1426 err = -EOPNOTSUPP;
1427 goto errout;
1428 }
1429
1430 if (!netif_device_present(dev)) {
1431 err = -ENODEV;
1432 goto errout;
1433 }
1434
1435 u_map = nla_data(tb[IFLA_MAP]);
1436 k_map.mem_start = (unsigned long) u_map->mem_start;
1437 k_map.mem_end = (unsigned long) u_map->mem_end;
1438 k_map.base_addr = (unsigned short) u_map->base_addr;
1439 k_map.irq = (unsigned char) u_map->irq;
1440 k_map.dma = (unsigned char) u_map->dma;
1441 k_map.port = (unsigned char) u_map->port;
1442
1443 err = ops->ndo_set_config(dev, &k_map);
1444 if (err < 0)
1445 goto errout;
1446
1447 modified = 1;
1448 }
1449
1450 if (tb[IFLA_ADDRESS]) {
1451 struct sockaddr *sa;
1452 int len;
1453
1454 len = sizeof(sa_family_t) + dev->addr_len;
1455 sa = kmalloc(len, GFP_KERNEL);
1456 if (!sa) {
1457 err = -ENOMEM;
1458 goto errout;
1459 }
1460 sa->sa_family = dev->type;
1461 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1462 dev->addr_len);
1463 err = dev_set_mac_address(dev, sa);
1464 kfree(sa);
1465 if (err)
1466 goto errout;
1467 modified = 1;
1468 }
1469
1470 if (tb[IFLA_MTU]) {
1471 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1472 if (err < 0)
1473 goto errout;
1474 modified = 1;
1475 }
1476
1477 if (tb[IFLA_GROUP]) {
1478 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1479 modified = 1;
1480 }
1481
1482 /*
1483 * Interface selected by interface index but interface
1484 * name provided implies that a name change has been
1485 * requested.
1486 */
1487 if (ifm->ifi_index > 0 && ifname[0]) {
1488 err = dev_change_name(dev, ifname);
1489 if (err < 0)
1490 goto errout;
1491 modified = 1;
1492 }
1493
1494 if (tb[IFLA_IFALIAS]) {
1495 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1496 nla_len(tb[IFLA_IFALIAS]));
1497 if (err < 0)
1498 goto errout;
1499 modified = 1;
1500 }
1501
1502 if (tb[IFLA_BROADCAST]) {
1503 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1504 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1505 }
1506
1507 if (ifm->ifi_flags || ifm->ifi_change) {
1508 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1509 if (err < 0)
1510 goto errout;
1511 }
1512
1513 if (tb[IFLA_MASTER]) {
1514 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1515 if (err)
1516 goto errout;
1517 modified = 1;
1518 }
1519
1520 if (tb[IFLA_CARRIER]) {
1521 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1522 if (err)
1523 goto errout;
1524 modified = 1;
1525 }
1526
1527 if (tb[IFLA_TXQLEN])
1528 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1529
1530 if (tb[IFLA_OPERSTATE])
1531 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1532
1533 if (tb[IFLA_LINKMODE]) {
1534 write_lock_bh(&dev_base_lock);
1535 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1536 write_unlock_bh(&dev_base_lock);
1537 }
1538
1539 if (tb[IFLA_VFINFO_LIST]) {
1540 struct nlattr *attr;
1541 int rem;
1542 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1543 if (nla_type(attr) != IFLA_VF_INFO) {
1544 err = -EINVAL;
1545 goto errout;
1546 }
1547 err = do_setvfinfo(dev, attr);
1548 if (err < 0)
1549 goto errout;
1550 modified = 1;
1551 }
1552 }
1553 err = 0;
1554
1555 if (tb[IFLA_VF_PORTS]) {
1556 struct nlattr *port[IFLA_PORT_MAX+1];
1557 struct nlattr *attr;
1558 int vf;
1559 int rem;
1560
1561 err = -EOPNOTSUPP;
1562 if (!ops->ndo_set_vf_port)
1563 goto errout;
1564
1565 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1566 if (nla_type(attr) != IFLA_VF_PORT)
1567 continue;
1568 err = nla_parse_nested(port, IFLA_PORT_MAX,
1569 attr, ifla_port_policy);
1570 if (err < 0)
1571 goto errout;
1572 if (!port[IFLA_PORT_VF]) {
1573 err = -EOPNOTSUPP;
1574 goto errout;
1575 }
1576 vf = nla_get_u32(port[IFLA_PORT_VF]);
1577 err = ops->ndo_set_vf_port(dev, vf, port);
1578 if (err < 0)
1579 goto errout;
1580 modified = 1;
1581 }
1582 }
1583 err = 0;
1584
1585 if (tb[IFLA_PORT_SELF]) {
1586 struct nlattr *port[IFLA_PORT_MAX+1];
1587
1588 err = nla_parse_nested(port, IFLA_PORT_MAX,
1589 tb[IFLA_PORT_SELF], ifla_port_policy);
1590 if (err < 0)
1591 goto errout;
1592
1593 err = -EOPNOTSUPP;
1594 if (ops->ndo_set_vf_port)
1595 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1596 if (err < 0)
1597 goto errout;
1598 modified = 1;
1599 }
1600
1601 if (tb[IFLA_AF_SPEC]) {
1602 struct nlattr *af;
1603 int rem;
1604
1605 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1606 const struct rtnl_af_ops *af_ops;
1607
1608 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1609 BUG();
1610
1611 err = af_ops->set_link_af(dev, af);
1612 if (err < 0)
1613 goto errout;
1614
1615 modified = 1;
1616 }
1617 }
1618 err = 0;
1619
1620 errout:
1621 if (err < 0 && modified)
1622 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",
1623 dev->name);
1624
1625 return err;
1626 }
1627
1628 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1629 {
1630 struct net *net = sock_net(skb->sk);
1631 struct ifinfomsg *ifm;
1632 struct net_device *dev;
1633 int err;
1634 struct nlattr *tb[IFLA_MAX+1];
1635 char ifname[IFNAMSIZ];
1636
1637 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1638 if (err < 0)
1639 goto errout;
1640
1641 if (tb[IFLA_IFNAME])
1642 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1643 else
1644 ifname[0] = '\0';
1645
1646 err = -EINVAL;
1647 ifm = nlmsg_data(nlh);
1648 if (ifm->ifi_index > 0)
1649 dev = __dev_get_by_index(net, ifm->ifi_index);
1650 else if (tb[IFLA_IFNAME])
1651 dev = __dev_get_by_name(net, ifname);
1652 else
1653 goto errout;
1654
1655 if (dev == NULL) {
1656 err = -ENODEV;
1657 goto errout;
1658 }
1659
1660 err = validate_linkmsg(dev, tb);
1661 if (err < 0)
1662 goto errout;
1663
1664 err = do_setlink(dev, ifm, tb, ifname, 0);
1665 errout:
1666 return err;
1667 }
1668
1669 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1670 {
1671 struct net *net = sock_net(skb->sk);
1672 const struct rtnl_link_ops *ops;
1673 struct net_device *dev;
1674 struct ifinfomsg *ifm;
1675 char ifname[IFNAMSIZ];
1676 struct nlattr *tb[IFLA_MAX+1];
1677 int err;
1678 LIST_HEAD(list_kill);
1679
1680 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1681 if (err < 0)
1682 return err;
1683
1684 if (tb[IFLA_IFNAME])
1685 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1686
1687 ifm = nlmsg_data(nlh);
1688 if (ifm->ifi_index > 0)
1689 dev = __dev_get_by_index(net, ifm->ifi_index);
1690 else if (tb[IFLA_IFNAME])
1691 dev = __dev_get_by_name(net, ifname);
1692 else
1693 return -EINVAL;
1694
1695 if (!dev)
1696 return -ENODEV;
1697
1698 ops = dev->rtnl_link_ops;
1699 if (!ops)
1700 return -EOPNOTSUPP;
1701
1702 ops->dellink(dev, &list_kill);
1703 unregister_netdevice_many(&list_kill);
1704 list_del(&list_kill);
1705 return 0;
1706 }
1707
1708 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1709 {
1710 unsigned int old_flags;
1711 int err;
1712
1713 old_flags = dev->flags;
1714 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1715 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1716 if (err < 0)
1717 return err;
1718 }
1719
1720 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1721
1722 __dev_notify_flags(dev, old_flags, ~0U);
1723 return 0;
1724 }
1725 EXPORT_SYMBOL(rtnl_configure_link);
1726
1727 struct net_device *rtnl_create_link(struct net *net,
1728 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1729 {
1730 int err;
1731 struct net_device *dev;
1732 unsigned int num_tx_queues = 1;
1733 unsigned int num_rx_queues = 1;
1734
1735 if (tb[IFLA_NUM_TX_QUEUES])
1736 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1737 else if (ops->get_num_tx_queues)
1738 num_tx_queues = ops->get_num_tx_queues();
1739
1740 if (tb[IFLA_NUM_RX_QUEUES])
1741 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1742 else if (ops->get_num_rx_queues)
1743 num_rx_queues = ops->get_num_rx_queues();
1744
1745 err = -ENOMEM;
1746 dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup,
1747 num_tx_queues, num_rx_queues);
1748 if (!dev)
1749 goto err;
1750
1751 dev_net_set(dev, net);
1752 dev->rtnl_link_ops = ops;
1753 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1754
1755 if (tb[IFLA_MTU])
1756 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1757 if (tb[IFLA_ADDRESS]) {
1758 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1759 nla_len(tb[IFLA_ADDRESS]));
1760 dev->addr_assign_type = NET_ADDR_SET;
1761 }
1762 if (tb[IFLA_BROADCAST])
1763 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1764 nla_len(tb[IFLA_BROADCAST]));
1765 if (tb[IFLA_TXQLEN])
1766 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1767 if (tb[IFLA_OPERSTATE])
1768 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1769 if (tb[IFLA_LINKMODE])
1770 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1771 if (tb[IFLA_GROUP])
1772 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1773
1774 return dev;
1775
1776 err:
1777 return ERR_PTR(err);
1778 }
1779 EXPORT_SYMBOL(rtnl_create_link);
1780
1781 static int rtnl_group_changelink(struct net *net, int group,
1782 struct ifinfomsg *ifm,
1783 struct nlattr **tb)
1784 {
1785 struct net_device *dev;
1786 int err;
1787
1788 for_each_netdev(net, dev) {
1789 if (dev->group == group) {
1790 err = do_setlink(dev, ifm, tb, NULL, 0);
1791 if (err < 0)
1792 return err;
1793 }
1794 }
1795
1796 return 0;
1797 }
1798
1799 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1800 {
1801 struct net *net = sock_net(skb->sk);
1802 const struct rtnl_link_ops *ops;
1803 const struct rtnl_link_ops *m_ops = NULL;
1804 struct net_device *dev;
1805 struct net_device *master_dev = NULL;
1806 struct ifinfomsg *ifm;
1807 char kind[MODULE_NAME_LEN];
1808 char ifname[IFNAMSIZ];
1809 struct nlattr *tb[IFLA_MAX+1];
1810 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1811 int err;
1812
1813 #ifdef CONFIG_MODULES
1814 replay:
1815 #endif
1816 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1817 if (err < 0)
1818 return err;
1819
1820 if (tb[IFLA_IFNAME])
1821 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1822 else
1823 ifname[0] = '\0';
1824
1825 ifm = nlmsg_data(nlh);
1826 if (ifm->ifi_index > 0)
1827 dev = __dev_get_by_index(net, ifm->ifi_index);
1828 else {
1829 if (ifname[0])
1830 dev = __dev_get_by_name(net, ifname);
1831 else
1832 dev = NULL;
1833 }
1834
1835 if (dev) {
1836 master_dev = netdev_master_upper_dev_get(dev);
1837 if (master_dev)
1838 m_ops = master_dev->rtnl_link_ops;
1839 }
1840
1841 err = validate_linkmsg(dev, tb);
1842 if (err < 0)
1843 return err;
1844
1845 if (tb[IFLA_LINKINFO]) {
1846 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1847 tb[IFLA_LINKINFO], ifla_info_policy);
1848 if (err < 0)
1849 return err;
1850 } else
1851 memset(linkinfo, 0, sizeof(linkinfo));
1852
1853 if (linkinfo[IFLA_INFO_KIND]) {
1854 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1855 ops = rtnl_link_ops_get(kind);
1856 } else {
1857 kind[0] = '\0';
1858 ops = NULL;
1859 }
1860
1861 if (1) {
1862 struct nlattr *attr[ops ? ops->maxtype + 1 : 0];
1863 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 0];
1864 struct nlattr **data = NULL;
1865 struct nlattr **slave_data = NULL;
1866 struct net *dest_net;
1867
1868 if (ops) {
1869 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1870 err = nla_parse_nested(attr, ops->maxtype,
1871 linkinfo[IFLA_INFO_DATA],
1872 ops->policy);
1873 if (err < 0)
1874 return err;
1875 data = attr;
1876 }
1877 if (ops->validate) {
1878 err = ops->validate(tb, data);
1879 if (err < 0)
1880 return err;
1881 }
1882 }
1883
1884 if (m_ops) {
1885 if (m_ops->slave_maxtype &&
1886 linkinfo[IFLA_INFO_SLAVE_DATA]) {
1887 err = nla_parse_nested(slave_attr,
1888 m_ops->slave_maxtype,
1889 linkinfo[IFLA_INFO_SLAVE_DATA],
1890 m_ops->slave_policy);
1891 if (err < 0)
1892 return err;
1893 slave_data = slave_attr;
1894 }
1895 if (m_ops->slave_validate) {
1896 err = m_ops->slave_validate(tb, slave_data);
1897 if (err < 0)
1898 return err;
1899 }
1900 }
1901
1902 if (dev) {
1903 int modified = 0;
1904
1905 if (nlh->nlmsg_flags & NLM_F_EXCL)
1906 return -EEXIST;
1907 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1908 return -EOPNOTSUPP;
1909
1910 if (linkinfo[IFLA_INFO_DATA]) {
1911 if (!ops || ops != dev->rtnl_link_ops ||
1912 !ops->changelink)
1913 return -EOPNOTSUPP;
1914
1915 err = ops->changelink(dev, tb, data);
1916 if (err < 0)
1917 return err;
1918 modified = 1;
1919 }
1920
1921 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
1922 if (!m_ops || !m_ops->slave_changelink)
1923 return -EOPNOTSUPP;
1924
1925 err = m_ops->slave_changelink(master_dev, dev,
1926 tb, slave_data);
1927 if (err < 0)
1928 return err;
1929 modified = 1;
1930 }
1931
1932 return do_setlink(dev, ifm, tb, ifname, modified);
1933 }
1934
1935 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1936 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1937 return rtnl_group_changelink(net,
1938 nla_get_u32(tb[IFLA_GROUP]),
1939 ifm, tb);
1940 return -ENODEV;
1941 }
1942
1943 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1944 return -EOPNOTSUPP;
1945
1946 if (!ops) {
1947 #ifdef CONFIG_MODULES
1948 if (kind[0]) {
1949 __rtnl_unlock();
1950 request_module("rtnl-link-%s", kind);
1951 rtnl_lock();
1952 ops = rtnl_link_ops_get(kind);
1953 if (ops)
1954 goto replay;
1955 }
1956 #endif
1957 return -EOPNOTSUPP;
1958 }
1959
1960 if (!ifname[0])
1961 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1962
1963 dest_net = rtnl_link_get_net(net, tb);
1964 if (IS_ERR(dest_net))
1965 return PTR_ERR(dest_net);
1966
1967 dev = rtnl_create_link(dest_net, ifname, ops, tb);
1968 if (IS_ERR(dev)) {
1969 err = PTR_ERR(dev);
1970 goto out;
1971 }
1972
1973 dev->ifindex = ifm->ifi_index;
1974
1975 if (ops->newlink) {
1976 err = ops->newlink(net, dev, tb, data);
1977 /* Drivers should call free_netdev() in ->destructor
1978 * and unregister it on failure so that device could be
1979 * finally freed in rtnl_unlock.
1980 */
1981 if (err < 0)
1982 goto out;
1983 } else {
1984 err = register_netdevice(dev);
1985 if (err < 0) {
1986 free_netdev(dev);
1987 goto out;
1988 }
1989 }
1990 err = rtnl_configure_link(dev, ifm);
1991 if (err < 0)
1992 unregister_netdevice(dev);
1993 out:
1994 put_net(dest_net);
1995 return err;
1996 }
1997 }
1998
1999 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2000 {
2001 struct net *net = sock_net(skb->sk);
2002 struct ifinfomsg *ifm;
2003 char ifname[IFNAMSIZ];
2004 struct nlattr *tb[IFLA_MAX+1];
2005 struct net_device *dev = NULL;
2006 struct sk_buff *nskb;
2007 int err;
2008 u32 ext_filter_mask = 0;
2009
2010 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2011 if (err < 0)
2012 return err;
2013
2014 if (tb[IFLA_IFNAME])
2015 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2016
2017 if (tb[IFLA_EXT_MASK])
2018 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2019
2020 ifm = nlmsg_data(nlh);
2021 if (ifm->ifi_index > 0)
2022 dev = __dev_get_by_index(net, ifm->ifi_index);
2023 else if (tb[IFLA_IFNAME])
2024 dev = __dev_get_by_name(net, ifname);
2025 else
2026 return -EINVAL;
2027
2028 if (dev == NULL)
2029 return -ENODEV;
2030
2031 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2032 if (nskb == NULL)
2033 return -ENOBUFS;
2034
2035 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2036 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2037 if (err < 0) {
2038 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2039 WARN_ON(err == -EMSGSIZE);
2040 kfree_skb(nskb);
2041 } else
2042 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2043
2044 return err;
2045 }
2046
2047 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2048 {
2049 struct net *net = sock_net(skb->sk);
2050 struct net_device *dev;
2051 struct nlattr *tb[IFLA_MAX+1];
2052 u32 ext_filter_mask = 0;
2053 u16 min_ifinfo_dump_size = 0;
2054
2055 if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2056 ifla_policy) >= 0) {
2057 if (tb[IFLA_EXT_MASK])
2058 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2059 }
2060
2061 if (!ext_filter_mask)
2062 return NLMSG_GOODSIZE;
2063 /*
2064 * traverse the list of net devices and compute the minimum
2065 * buffer size based upon the filter mask.
2066 */
2067 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2068 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2069 if_nlmsg_size(dev,
2070 ext_filter_mask));
2071 }
2072
2073 return min_ifinfo_dump_size;
2074 }
2075
2076 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2077 {
2078 int idx;
2079 int s_idx = cb->family;
2080
2081 if (s_idx == 0)
2082 s_idx = 1;
2083 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2084 int type = cb->nlh->nlmsg_type-RTM_BASE;
2085 if (idx < s_idx || idx == PF_PACKET)
2086 continue;
2087 if (rtnl_msg_handlers[idx] == NULL ||
2088 rtnl_msg_handlers[idx][type].dumpit == NULL)
2089 continue;
2090 if (idx > s_idx) {
2091 memset(&cb->args[0], 0, sizeof(cb->args));
2092 cb->prev_seq = 0;
2093 cb->seq = 0;
2094 }
2095 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2096 break;
2097 }
2098 cb->family = idx;
2099
2100 return skb->len;
2101 }
2102
2103 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2104 gfp_t flags)
2105 {
2106 struct net *net = dev_net(dev);
2107 struct sk_buff *skb;
2108 int err = -ENOBUFS;
2109 size_t if_info_size;
2110
2111 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2112 if (skb == NULL)
2113 goto errout;
2114
2115 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2116 if (err < 0) {
2117 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2118 WARN_ON(err == -EMSGSIZE);
2119 kfree_skb(skb);
2120 goto errout;
2121 }
2122 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2123 return;
2124 errout:
2125 if (err < 0)
2126 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2127 }
2128 EXPORT_SYMBOL(rtmsg_ifinfo);
2129
2130 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2131 struct net_device *dev,
2132 u8 *addr, u32 pid, u32 seq,
2133 int type, unsigned int flags,
2134 int nlflags)
2135 {
2136 struct nlmsghdr *nlh;
2137 struct ndmsg *ndm;
2138
2139 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2140 if (!nlh)
2141 return -EMSGSIZE;
2142
2143 ndm = nlmsg_data(nlh);
2144 ndm->ndm_family = AF_BRIDGE;
2145 ndm->ndm_pad1 = 0;
2146 ndm->ndm_pad2 = 0;
2147 ndm->ndm_flags = flags;
2148 ndm->ndm_type = 0;
2149 ndm->ndm_ifindex = dev->ifindex;
2150 ndm->ndm_state = NUD_PERMANENT;
2151
2152 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2153 goto nla_put_failure;
2154
2155 return nlmsg_end(skb, nlh);
2156
2157 nla_put_failure:
2158 nlmsg_cancel(skb, nlh);
2159 return -EMSGSIZE;
2160 }
2161
2162 static inline size_t rtnl_fdb_nlmsg_size(void)
2163 {
2164 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2165 }
2166
2167 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2168 {
2169 struct net *net = dev_net(dev);
2170 struct sk_buff *skb;
2171 int err = -ENOBUFS;
2172
2173 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2174 if (!skb)
2175 goto errout;
2176
2177 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0);
2178 if (err < 0) {
2179 kfree_skb(skb);
2180 goto errout;
2181 }
2182
2183 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2184 return;
2185 errout:
2186 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2187 }
2188
2189 /**
2190 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2191 */
2192 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2193 struct nlattr *tb[],
2194 struct net_device *dev,
2195 const unsigned char *addr,
2196 u16 flags)
2197 {
2198 int err = -EINVAL;
2199
2200 /* If aging addresses are supported device will need to
2201 * implement its own handler for this.
2202 */
2203 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2204 pr_info("%s: FDB only supports static addresses\n", dev->name);
2205 return err;
2206 }
2207
2208 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2209 err = dev_uc_add_excl(dev, addr);
2210 else if (is_multicast_ether_addr(addr))
2211 err = dev_mc_add_excl(dev, addr);
2212
2213 /* Only return duplicate errors if NLM_F_EXCL is set */
2214 if (err == -EEXIST && !(flags & NLM_F_EXCL))
2215 err = 0;
2216
2217 return err;
2218 }
2219 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2220
2221 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2222 {
2223 struct net *net = sock_net(skb->sk);
2224 struct ndmsg *ndm;
2225 struct nlattr *tb[NDA_MAX+1];
2226 struct net_device *dev;
2227 u8 *addr;
2228 int err;
2229
2230 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2231 if (err < 0)
2232 return err;
2233
2234 ndm = nlmsg_data(nlh);
2235 if (ndm->ndm_ifindex == 0) {
2236 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2237 return -EINVAL;
2238 }
2239
2240 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2241 if (dev == NULL) {
2242 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2243 return -ENODEV;
2244 }
2245
2246 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2247 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2248 return -EINVAL;
2249 }
2250
2251 addr = nla_data(tb[NDA_LLADDR]);
2252
2253 err = -EOPNOTSUPP;
2254
2255 /* Support fdb on master device the net/bridge default case */
2256 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2257 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2258 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2259 const struct net_device_ops *ops = br_dev->netdev_ops;
2260
2261 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2262 if (err)
2263 goto out;
2264 else
2265 ndm->ndm_flags &= ~NTF_MASTER;
2266 }
2267
2268 /* Embedded bridge, macvlan, and any other device support */
2269 if ((ndm->ndm_flags & NTF_SELF)) {
2270 if (dev->netdev_ops->ndo_fdb_add)
2271 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2272 nlh->nlmsg_flags);
2273 else
2274 err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2275 nlh->nlmsg_flags);
2276
2277 if (!err) {
2278 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2279 ndm->ndm_flags &= ~NTF_SELF;
2280 }
2281 }
2282 out:
2283 return err;
2284 }
2285
2286 /**
2287 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2288 */
2289 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2290 struct nlattr *tb[],
2291 struct net_device *dev,
2292 const unsigned char *addr)
2293 {
2294 int err = -EOPNOTSUPP;
2295
2296 /* If aging addresses are supported device will need to
2297 * implement its own handler for this.
2298 */
2299 if (!(ndm->ndm_state & NUD_PERMANENT)) {
2300 pr_info("%s: FDB only supports static addresses\n", dev->name);
2301 return -EINVAL;
2302 }
2303
2304 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2305 err = dev_uc_del(dev, addr);
2306 else if (is_multicast_ether_addr(addr))
2307 err = dev_mc_del(dev, addr);
2308 else
2309 err = -EINVAL;
2310
2311 return err;
2312 }
2313 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2314
2315 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2316 {
2317 struct net *net = sock_net(skb->sk);
2318 struct ndmsg *ndm;
2319 struct nlattr *tb[NDA_MAX+1];
2320 struct net_device *dev;
2321 int err = -EINVAL;
2322 __u8 *addr;
2323
2324 if (!capable(CAP_NET_ADMIN))
2325 return -EPERM;
2326
2327 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2328 if (err < 0)
2329 return err;
2330
2331 ndm = nlmsg_data(nlh);
2332 if (ndm->ndm_ifindex == 0) {
2333 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2334 return -EINVAL;
2335 }
2336
2337 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2338 if (dev == NULL) {
2339 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2340 return -ENODEV;
2341 }
2342
2343 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2344 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2345 return -EINVAL;
2346 }
2347
2348 addr = nla_data(tb[NDA_LLADDR]);
2349
2350 err = -EOPNOTSUPP;
2351
2352 /* Support fdb on master device the net/bridge default case */
2353 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2354 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2355 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2356 const struct net_device_ops *ops = br_dev->netdev_ops;
2357
2358 if (ops->ndo_fdb_del)
2359 err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2360
2361 if (err)
2362 goto out;
2363 else
2364 ndm->ndm_flags &= ~NTF_MASTER;
2365 }
2366
2367 /* Embedded bridge, macvlan, and any other device support */
2368 if (ndm->ndm_flags & NTF_SELF) {
2369 if (dev->netdev_ops->ndo_fdb_del)
2370 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2371 else
2372 err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2373
2374 if (!err) {
2375 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2376 ndm->ndm_flags &= ~NTF_SELF;
2377 }
2378 }
2379 out:
2380 return err;
2381 }
2382
2383 static int nlmsg_populate_fdb(struct sk_buff *skb,
2384 struct netlink_callback *cb,
2385 struct net_device *dev,
2386 int *idx,
2387 struct netdev_hw_addr_list *list)
2388 {
2389 struct netdev_hw_addr *ha;
2390 int err;
2391 u32 portid, seq;
2392
2393 portid = NETLINK_CB(cb->skb).portid;
2394 seq = cb->nlh->nlmsg_seq;
2395
2396 list_for_each_entry(ha, &list->list, list) {
2397 if (*idx < cb->args[0])
2398 goto skip;
2399
2400 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2401 portid, seq,
2402 RTM_NEWNEIGH, NTF_SELF,
2403 NLM_F_MULTI);
2404 if (err < 0)
2405 return err;
2406 skip:
2407 *idx += 1;
2408 }
2409 return 0;
2410 }
2411
2412 /**
2413 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2414 * @nlh: netlink message header
2415 * @dev: netdevice
2416 *
2417 * Default netdevice operation to dump the existing unicast address list.
2418 * Returns number of addresses from list put in skb.
2419 */
2420 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2421 struct netlink_callback *cb,
2422 struct net_device *dev,
2423 int idx)
2424 {
2425 int err;
2426
2427 netif_addr_lock_bh(dev);
2428 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2429 if (err)
2430 goto out;
2431 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2432 out:
2433 netif_addr_unlock_bh(dev);
2434 return idx;
2435 }
2436 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2437
2438 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2439 {
2440 int idx = 0;
2441 struct net *net = sock_net(skb->sk);
2442 struct net_device *dev;
2443
2444 rcu_read_lock();
2445 for_each_netdev_rcu(net, dev) {
2446 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2447 struct net_device *br_dev;
2448 const struct net_device_ops *ops;
2449
2450 br_dev = netdev_master_upper_dev_get(dev);
2451 ops = br_dev->netdev_ops;
2452 if (ops->ndo_fdb_dump)
2453 idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
2454 }
2455
2456 if (dev->netdev_ops->ndo_fdb_dump)
2457 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
2458 else
2459 idx = ndo_dflt_fdb_dump(skb, cb, dev, idx);
2460 }
2461 rcu_read_unlock();
2462
2463 cb->args[0] = idx;
2464 return skb->len;
2465 }
2466
2467 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2468 struct net_device *dev, u16 mode)
2469 {
2470 struct nlmsghdr *nlh;
2471 struct ifinfomsg *ifm;
2472 struct nlattr *br_afspec;
2473 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2474 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2475
2476 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2477 if (nlh == NULL)
2478 return -EMSGSIZE;
2479
2480 ifm = nlmsg_data(nlh);
2481 ifm->ifi_family = AF_BRIDGE;
2482 ifm->__ifi_pad = 0;
2483 ifm->ifi_type = dev->type;
2484 ifm->ifi_index = dev->ifindex;
2485 ifm->ifi_flags = dev_get_flags(dev);
2486 ifm->ifi_change = 0;
2487
2488
2489 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2490 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2491 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2492 (br_dev &&
2493 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2494 (dev->addr_len &&
2495 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2496 (dev->ifindex != dev->iflink &&
2497 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2498 goto nla_put_failure;
2499
2500 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2501 if (!br_afspec)
2502 goto nla_put_failure;
2503
2504 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2505 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2506 nla_nest_cancel(skb, br_afspec);
2507 goto nla_put_failure;
2508 }
2509 nla_nest_end(skb, br_afspec);
2510
2511 return nlmsg_end(skb, nlh);
2512 nla_put_failure:
2513 nlmsg_cancel(skb, nlh);
2514 return -EMSGSIZE;
2515 }
2516 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2517
2518 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2519 {
2520 struct net *net = sock_net(skb->sk);
2521 struct net_device *dev;
2522 int idx = 0;
2523 u32 portid = NETLINK_CB(cb->skb).portid;
2524 u32 seq = cb->nlh->nlmsg_seq;
2525 struct nlattr *extfilt;
2526 u32 filter_mask = 0;
2527
2528 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2529 IFLA_EXT_MASK);
2530 if (extfilt)
2531 filter_mask = nla_get_u32(extfilt);
2532
2533 rcu_read_lock();
2534 for_each_netdev_rcu(net, dev) {
2535 const struct net_device_ops *ops = dev->netdev_ops;
2536 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2537
2538 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2539 if (idx >= cb->args[0] &&
2540 br_dev->netdev_ops->ndo_bridge_getlink(
2541 skb, portid, seq, dev, filter_mask) < 0)
2542 break;
2543 idx++;
2544 }
2545
2546 if (ops->ndo_bridge_getlink) {
2547 if (idx >= cb->args[0] &&
2548 ops->ndo_bridge_getlink(skb, portid, seq, dev,
2549 filter_mask) < 0)
2550 break;
2551 idx++;
2552 }
2553 }
2554 rcu_read_unlock();
2555 cb->args[0] = idx;
2556
2557 return skb->len;
2558 }
2559
2560 static inline size_t bridge_nlmsg_size(void)
2561 {
2562 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2563 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
2564 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
2565 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
2566 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
2567 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
2568 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
2569 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
2570 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2571 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
2572 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
2573 }
2574
2575 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2576 {
2577 struct net *net = dev_net(dev);
2578 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2579 struct sk_buff *skb;
2580 int err = -EOPNOTSUPP;
2581
2582 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2583 if (!skb) {
2584 err = -ENOMEM;
2585 goto errout;
2586 }
2587
2588 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2589 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2590 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2591 if (err < 0)
2592 goto errout;
2593 }
2594
2595 if ((flags & BRIDGE_FLAGS_SELF) &&
2596 dev->netdev_ops->ndo_bridge_getlink) {
2597 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2598 if (err < 0)
2599 goto errout;
2600 }
2601
2602 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2603 return 0;
2604 errout:
2605 WARN_ON(err == -EMSGSIZE);
2606 kfree_skb(skb);
2607 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2608 return err;
2609 }
2610
2611 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2612 {
2613 struct net *net = sock_net(skb->sk);
2614 struct ifinfomsg *ifm;
2615 struct net_device *dev;
2616 struct nlattr *br_spec, *attr = NULL;
2617 int rem, err = -EOPNOTSUPP;
2618 u16 oflags, flags = 0;
2619 bool have_flags = false;
2620
2621 if (nlmsg_len(nlh) < sizeof(*ifm))
2622 return -EINVAL;
2623
2624 ifm = nlmsg_data(nlh);
2625 if (ifm->ifi_family != AF_BRIDGE)
2626 return -EPFNOSUPPORT;
2627
2628 dev = __dev_get_by_index(net, ifm->ifi_index);
2629 if (!dev) {
2630 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2631 return -ENODEV;
2632 }
2633
2634 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2635 if (br_spec) {
2636 nla_for_each_nested(attr, br_spec, rem) {
2637 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2638 have_flags = true;
2639 flags = nla_get_u16(attr);
2640 break;
2641 }
2642 }
2643 }
2644
2645 oflags = flags;
2646
2647 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2648 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2649
2650 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2651 err = -EOPNOTSUPP;
2652 goto out;
2653 }
2654
2655 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2656 if (err)
2657 goto out;
2658
2659 flags &= ~BRIDGE_FLAGS_MASTER;
2660 }
2661
2662 if ((flags & BRIDGE_FLAGS_SELF)) {
2663 if (!dev->netdev_ops->ndo_bridge_setlink)
2664 err = -EOPNOTSUPP;
2665 else
2666 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2667
2668 if (!err)
2669 flags &= ~BRIDGE_FLAGS_SELF;
2670 }
2671
2672 if (have_flags)
2673 memcpy(nla_data(attr), &flags, sizeof(flags));
2674 /* Generate event to notify upper layer of bridge change */
2675 if (!err)
2676 err = rtnl_bridge_notify(dev, oflags);
2677 out:
2678 return err;
2679 }
2680
2681 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2682 {
2683 struct net *net = sock_net(skb->sk);
2684 struct ifinfomsg *ifm;
2685 struct net_device *dev;
2686 struct nlattr *br_spec, *attr = NULL;
2687 int rem, err = -EOPNOTSUPP;
2688 u16 oflags, flags = 0;
2689 bool have_flags = false;
2690
2691 if (nlmsg_len(nlh) < sizeof(*ifm))
2692 return -EINVAL;
2693
2694 ifm = nlmsg_data(nlh);
2695 if (ifm->ifi_family != AF_BRIDGE)
2696 return -EPFNOSUPPORT;
2697
2698 dev = __dev_get_by_index(net, ifm->ifi_index);
2699 if (!dev) {
2700 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2701 return -ENODEV;
2702 }
2703
2704 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2705 if (br_spec) {
2706 nla_for_each_nested(attr, br_spec, rem) {
2707 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2708 have_flags = true;
2709 flags = nla_get_u16(attr);
2710 break;
2711 }
2712 }
2713 }
2714
2715 oflags = flags;
2716
2717 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2718 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2719
2720 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2721 err = -EOPNOTSUPP;
2722 goto out;
2723 }
2724
2725 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2726 if (err)
2727 goto out;
2728
2729 flags &= ~BRIDGE_FLAGS_MASTER;
2730 }
2731
2732 if ((flags & BRIDGE_FLAGS_SELF)) {
2733 if (!dev->netdev_ops->ndo_bridge_dellink)
2734 err = -EOPNOTSUPP;
2735 else
2736 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2737
2738 if (!err)
2739 flags &= ~BRIDGE_FLAGS_SELF;
2740 }
2741
2742 if (have_flags)
2743 memcpy(nla_data(attr), &flags, sizeof(flags));
2744 /* Generate event to notify upper layer of bridge change */
2745 if (!err)
2746 err = rtnl_bridge_notify(dev, oflags);
2747 out:
2748 return err;
2749 }
2750
2751 /* Process one rtnetlink message. */
2752
2753 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2754 {
2755 struct net *net = sock_net(skb->sk);
2756 rtnl_doit_func doit;
2757 int sz_idx, kind;
2758 int family;
2759 int type;
2760 int err;
2761
2762 type = nlh->nlmsg_type;
2763 if (type > RTM_MAX)
2764 return -EOPNOTSUPP;
2765
2766 type -= RTM_BASE;
2767
2768 /* All the messages must have at least 1 byte length */
2769 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2770 return 0;
2771
2772 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2773 sz_idx = type>>2;
2774 kind = type&3;
2775
2776 if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN))
2777 return -EPERM;
2778
2779 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2780 struct sock *rtnl;
2781 rtnl_dumpit_func dumpit;
2782 rtnl_calcit_func calcit;
2783 u16 min_dump_alloc = 0;
2784
2785 dumpit = rtnl_get_dumpit(family, type);
2786 if (dumpit == NULL)
2787 return -EOPNOTSUPP;
2788 calcit = rtnl_get_calcit(family, type);
2789 if (calcit)
2790 min_dump_alloc = calcit(skb, nlh);
2791
2792 __rtnl_unlock();
2793 rtnl = net->rtnl;
2794 {
2795 struct netlink_dump_control c = {
2796 .dump = dumpit,
2797 .min_dump_alloc = min_dump_alloc,
2798 };
2799 err = netlink_dump_start(rtnl, skb, nlh, &c);
2800 }
2801 rtnl_lock();
2802 return err;
2803 }
2804
2805 doit = rtnl_get_doit(family, type);
2806 if (doit == NULL)
2807 return -EOPNOTSUPP;
2808
2809 return doit(skb, nlh);
2810 }
2811
2812 static void rtnetlink_rcv(struct sk_buff *skb)
2813 {
2814 rtnl_lock();
2815 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2816 rtnl_unlock();
2817 }
2818
2819 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2820 {
2821 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2822
2823 switch (event) {
2824 case NETDEV_UP:
2825 case NETDEV_DOWN:
2826 case NETDEV_PRE_UP:
2827 case NETDEV_POST_INIT:
2828 case NETDEV_REGISTER:
2829 case NETDEV_CHANGE:
2830 case NETDEV_PRE_TYPE_CHANGE:
2831 case NETDEV_GOING_DOWN:
2832 case NETDEV_UNREGISTER:
2833 case NETDEV_UNREGISTER_FINAL:
2834 case NETDEV_RELEASE:
2835 case NETDEV_JOIN:
2836 break;
2837 default:
2838 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
2839 break;
2840 }
2841 return NOTIFY_DONE;
2842 }
2843
2844 static struct notifier_block rtnetlink_dev_notifier = {
2845 .notifier_call = rtnetlink_event,
2846 };
2847
2848
2849 static int __net_init rtnetlink_net_init(struct net *net)
2850 {
2851 struct sock *sk;
2852 struct netlink_kernel_cfg cfg = {
2853 .groups = RTNLGRP_MAX,
2854 .input = rtnetlink_rcv,
2855 .cb_mutex = &rtnl_mutex,
2856 .flags = NL_CFG_F_NONROOT_RECV,
2857 };
2858
2859 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
2860 if (!sk)
2861 return -ENOMEM;
2862 net->rtnl = sk;
2863 return 0;
2864 }
2865
2866 static void __net_exit rtnetlink_net_exit(struct net *net)
2867 {
2868 netlink_kernel_release(net->rtnl);
2869 net->rtnl = NULL;
2870 }
2871
2872 static struct pernet_operations rtnetlink_net_ops = {
2873 .init = rtnetlink_net_init,
2874 .exit = rtnetlink_net_exit,
2875 };
2876
2877 void __init rtnetlink_init(void)
2878 {
2879 if (register_pernet_subsys(&rtnetlink_net_ops))
2880 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2881
2882 register_netdevice_notifier(&rtnetlink_dev_notifier);
2883
2884 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2885 rtnl_dump_ifinfo, rtnl_calcit);
2886 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2887 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2888 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2889
2890 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2891 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2892
2893 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
2894 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
2895 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
2896
2897 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
2898 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
2899 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
2900 }
2901
Linux with added FPC-III support