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