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