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Merge tag 'tty-3.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
[mirror_ubuntu-artful-kernel.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_size(const struct net_device *dev)
369 {
370 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
371 size_t size;
372
373 if (!ops)
374 return 0;
375
376 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
377 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
378
379 if (ops->get_size)
380 /* IFLA_INFO_DATA + nested data */
381 size += nla_total_size(sizeof(struct nlattr)) +
382 ops->get_size(dev);
383
384 if (ops->get_xstats_size)
385 /* IFLA_INFO_XSTATS */
386 size += nla_total_size(ops->get_xstats_size(dev));
387
388 return size;
389 }
390
391 static LIST_HEAD(rtnl_af_ops);
392
393 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
394 {
395 const struct rtnl_af_ops *ops;
396
397 list_for_each_entry(ops, &rtnl_af_ops, list) {
398 if (ops->family == family)
399 return ops;
400 }
401
402 return NULL;
403 }
404
405 /**
406 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
407 * @ops: struct rtnl_af_ops * to register
408 *
409 * The caller must hold the rtnl_mutex.
410 *
411 * Returns 0 on success or a negative error code.
412 */
413 int __rtnl_af_register(struct rtnl_af_ops *ops)
414 {
415 list_add_tail(&ops->list, &rtnl_af_ops);
416 return 0;
417 }
418 EXPORT_SYMBOL_GPL(__rtnl_af_register);
419
420 /**
421 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
422 * @ops: struct rtnl_af_ops * to register
423 *
424 * Returns 0 on success or a negative error code.
425 */
426 int rtnl_af_register(struct rtnl_af_ops *ops)
427 {
428 int err;
429
430 rtnl_lock();
431 err = __rtnl_af_register(ops);
432 rtnl_unlock();
433 return err;
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 int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
481 {
482 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
483 struct nlattr *linkinfo, *data;
484 int err = -EMSGSIZE;
485
486 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
487 if (linkinfo == NULL)
488 goto out;
489
490 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
491 goto err_cancel_link;
492 if (ops->fill_xstats) {
493 err = ops->fill_xstats(skb, dev);
494 if (err < 0)
495 goto err_cancel_link;
496 }
497 if (ops->fill_info) {
498 data = nla_nest_start(skb, IFLA_INFO_DATA);
499 if (data == NULL) {
500 err = -EMSGSIZE;
501 goto err_cancel_link;
502 }
503 err = ops->fill_info(skb, dev);
504 if (err < 0)
505 goto err_cancel_data;
506 nla_nest_end(skb, data);
507 }
508
509 nla_nest_end(skb, linkinfo);
510 return 0;
511
512 err_cancel_data:
513 nla_nest_cancel(skb, data);
514 err_cancel_link:
515 nla_nest_cancel(skb, linkinfo);
516 out:
517 return err;
518 }
519
520 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
521 {
522 struct sock *rtnl = net->rtnl;
523 int err = 0;
524
525 NETLINK_CB(skb).dst_group = group;
526 if (echo)
527 atomic_inc(&skb->users);
528 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
529 if (echo)
530 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
531 return err;
532 }
533
534 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
535 {
536 struct sock *rtnl = net->rtnl;
537
538 return nlmsg_unicast(rtnl, skb, pid);
539 }
540 EXPORT_SYMBOL(rtnl_unicast);
541
542 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
543 struct nlmsghdr *nlh, gfp_t flags)
544 {
545 struct sock *rtnl = net->rtnl;
546 int report = 0;
547
548 if (nlh)
549 report = nlmsg_report(nlh);
550
551 nlmsg_notify(rtnl, skb, pid, group, report, flags);
552 }
553 EXPORT_SYMBOL(rtnl_notify);
554
555 void rtnl_set_sk_err(struct net *net, u32 group, int error)
556 {
557 struct sock *rtnl = net->rtnl;
558
559 netlink_set_err(rtnl, 0, group, error);
560 }
561 EXPORT_SYMBOL(rtnl_set_sk_err);
562
563 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
564 {
565 struct nlattr *mx;
566 int i, valid = 0;
567
568 mx = nla_nest_start(skb, RTA_METRICS);
569 if (mx == NULL)
570 return -ENOBUFS;
571
572 for (i = 0; i < RTAX_MAX; i++) {
573 if (metrics[i]) {
574 valid++;
575 if (nla_put_u32(skb, i+1, metrics[i]))
576 goto nla_put_failure;
577 }
578 }
579
580 if (!valid) {
581 nla_nest_cancel(skb, mx);
582 return 0;
583 }
584
585 return nla_nest_end(skb, mx);
586
587 nla_put_failure:
588 nla_nest_cancel(skb, mx);
589 return -EMSGSIZE;
590 }
591 EXPORT_SYMBOL(rtnetlink_put_metrics);
592
593 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
594 long expires, u32 error)
595 {
596 struct rta_cacheinfo ci = {
597 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
598 .rta_used = dst->__use,
599 .rta_clntref = atomic_read(&(dst->__refcnt)),
600 .rta_error = error,
601 .rta_id = id,
602 };
603
604 if (expires) {
605 unsigned long clock;
606
607 clock = jiffies_to_clock_t(abs(expires));
608 clock = min_t(unsigned long, clock, INT_MAX);
609 ci.rta_expires = (expires > 0) ? clock : -clock;
610 }
611 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
612 }
613 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
614
615 static void set_operstate(struct net_device *dev, unsigned char transition)
616 {
617 unsigned char operstate = dev->operstate;
618
619 switch (transition) {
620 case IF_OPER_UP:
621 if ((operstate == IF_OPER_DORMANT ||
622 operstate == IF_OPER_UNKNOWN) &&
623 !netif_dormant(dev))
624 operstate = IF_OPER_UP;
625 break;
626
627 case IF_OPER_DORMANT:
628 if (operstate == IF_OPER_UP ||
629 operstate == IF_OPER_UNKNOWN)
630 operstate = IF_OPER_DORMANT;
631 break;
632 }
633
634 if (dev->operstate != operstate) {
635 write_lock_bh(&dev_base_lock);
636 dev->operstate = operstate;
637 write_unlock_bh(&dev_base_lock);
638 netdev_state_change(dev);
639 }
640 }
641
642 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
643 {
644 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
645 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
646 }
647
648 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
649 const struct ifinfomsg *ifm)
650 {
651 unsigned int flags = ifm->ifi_flags;
652
653 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
654 if (ifm->ifi_change)
655 flags = (flags & ifm->ifi_change) |
656 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
657
658 return flags;
659 }
660
661 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
662 const struct rtnl_link_stats64 *b)
663 {
664 a->rx_packets = b->rx_packets;
665 a->tx_packets = b->tx_packets;
666 a->rx_bytes = b->rx_bytes;
667 a->tx_bytes = b->tx_bytes;
668 a->rx_errors = b->rx_errors;
669 a->tx_errors = b->tx_errors;
670 a->rx_dropped = b->rx_dropped;
671 a->tx_dropped = b->tx_dropped;
672
673 a->multicast = b->multicast;
674 a->collisions = b->collisions;
675
676 a->rx_length_errors = b->rx_length_errors;
677 a->rx_over_errors = b->rx_over_errors;
678 a->rx_crc_errors = b->rx_crc_errors;
679 a->rx_frame_errors = b->rx_frame_errors;
680 a->rx_fifo_errors = b->rx_fifo_errors;
681 a->rx_missed_errors = b->rx_missed_errors;
682
683 a->tx_aborted_errors = b->tx_aborted_errors;
684 a->tx_carrier_errors = b->tx_carrier_errors;
685 a->tx_fifo_errors = b->tx_fifo_errors;
686 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
687 a->tx_window_errors = b->tx_window_errors;
688
689 a->rx_compressed = b->rx_compressed;
690 a->tx_compressed = b->tx_compressed;
691 }
692
693 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
694 {
695 memcpy(v, b, sizeof(*b));
696 }
697
698 /* All VF info */
699 static inline int rtnl_vfinfo_size(const struct net_device *dev,
700 u32 ext_filter_mask)
701 {
702 if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
703 (ext_filter_mask & RTEXT_FILTER_VF)) {
704 int num_vfs = dev_num_vf(dev->dev.parent);
705 size_t size = nla_total_size(sizeof(struct nlattr));
706 size += nla_total_size(num_vfs * sizeof(struct nlattr));
707 size += num_vfs *
708 (nla_total_size(sizeof(struct ifla_vf_mac)) +
709 nla_total_size(sizeof(struct ifla_vf_vlan)) +
710 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
711 nla_total_size(sizeof(struct ifla_vf_spoofchk)));
712 return size;
713 } else
714 return 0;
715 }
716
717 static size_t rtnl_port_size(const struct net_device *dev)
718 {
719 size_t port_size = nla_total_size(4) /* PORT_VF */
720 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
721 + nla_total_size(sizeof(struct ifla_port_vsi))
722 /* PORT_VSI_TYPE */
723 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
724 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
725 + nla_total_size(1) /* PROT_VDP_REQUEST */
726 + nla_total_size(2); /* PORT_VDP_RESPONSE */
727 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
728 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
729 + port_size;
730 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
731 + port_size;
732
733 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
734 return 0;
735 if (dev_num_vf(dev->dev.parent))
736 return port_self_size + vf_ports_size +
737 vf_port_size * dev_num_vf(dev->dev.parent);
738 else
739 return port_self_size;
740 }
741
742 static noinline size_t if_nlmsg_size(const struct net_device *dev,
743 u32 ext_filter_mask)
744 {
745 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
746 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
747 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
748 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
749 + nla_total_size(sizeof(struct rtnl_link_ifmap))
750 + nla_total_size(sizeof(struct rtnl_link_stats))
751 + nla_total_size(sizeof(struct rtnl_link_stats64))
752 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
753 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
754 + nla_total_size(4) /* IFLA_TXQLEN */
755 + nla_total_size(4) /* IFLA_WEIGHT */
756 + nla_total_size(4) /* IFLA_MTU */
757 + nla_total_size(4) /* IFLA_LINK */
758 + nla_total_size(4) /* IFLA_MASTER */
759 + nla_total_size(1) /* IFLA_CARRIER */
760 + nla_total_size(4) /* IFLA_PROMISCUITY */
761 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
762 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
763 + nla_total_size(1) /* IFLA_OPERSTATE */
764 + nla_total_size(1) /* IFLA_LINKMODE */
765 + nla_total_size(ext_filter_mask
766 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
767 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
768 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
769 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
770 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
771 + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */
772 }
773
774 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
775 {
776 struct nlattr *vf_ports;
777 struct nlattr *vf_port;
778 int vf;
779 int err;
780
781 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
782 if (!vf_ports)
783 return -EMSGSIZE;
784
785 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
786 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
787 if (!vf_port)
788 goto nla_put_failure;
789 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
790 goto nla_put_failure;
791 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
792 if (err == -EMSGSIZE)
793 goto nla_put_failure;
794 if (err) {
795 nla_nest_cancel(skb, vf_port);
796 continue;
797 }
798 nla_nest_end(skb, vf_port);
799 }
800
801 nla_nest_end(skb, vf_ports);
802
803 return 0;
804
805 nla_put_failure:
806 nla_nest_cancel(skb, vf_ports);
807 return -EMSGSIZE;
808 }
809
810 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
811 {
812 struct nlattr *port_self;
813 int err;
814
815 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
816 if (!port_self)
817 return -EMSGSIZE;
818
819 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
820 if (err) {
821 nla_nest_cancel(skb, port_self);
822 return (err == -EMSGSIZE) ? err : 0;
823 }
824
825 nla_nest_end(skb, port_self);
826
827 return 0;
828 }
829
830 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
831 {
832 int err;
833
834 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
835 return 0;
836
837 err = rtnl_port_self_fill(skb, dev);
838 if (err)
839 return err;
840
841 if (dev_num_vf(dev->dev.parent)) {
842 err = rtnl_vf_ports_fill(skb, dev);
843 if (err)
844 return err;
845 }
846
847 return 0;
848 }
849
850 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
851 {
852 int err;
853 struct netdev_phys_port_id ppid;
854
855 err = dev_get_phys_port_id(dev, &ppid);
856 if (err) {
857 if (err == -EOPNOTSUPP)
858 return 0;
859 return err;
860 }
861
862 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
863 return -EMSGSIZE;
864
865 return 0;
866 }
867
868 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
869 int type, u32 pid, u32 seq, u32 change,
870 unsigned int flags, u32 ext_filter_mask)
871 {
872 struct ifinfomsg *ifm;
873 struct nlmsghdr *nlh;
874 struct rtnl_link_stats64 temp;
875 const struct rtnl_link_stats64 *stats;
876 struct nlattr *attr, *af_spec;
877 struct rtnl_af_ops *af_ops;
878 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
879
880 ASSERT_RTNL();
881 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
882 if (nlh == NULL)
883 return -EMSGSIZE;
884
885 ifm = nlmsg_data(nlh);
886 ifm->ifi_family = AF_UNSPEC;
887 ifm->__ifi_pad = 0;
888 ifm->ifi_type = dev->type;
889 ifm->ifi_index = dev->ifindex;
890 ifm->ifi_flags = dev_get_flags(dev);
891 ifm->ifi_change = change;
892
893 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
894 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
895 nla_put_u8(skb, IFLA_OPERSTATE,
896 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
897 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
898 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
899 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
900 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
901 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
902 #ifdef CONFIG_RPS
903 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
904 #endif
905 (dev->ifindex != dev->iflink &&
906 nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
907 (upper_dev &&
908 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
909 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
910 (dev->qdisc &&
911 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
912 (dev->ifalias &&
913 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)))
914 goto nla_put_failure;
915
916 if (1) {
917 struct rtnl_link_ifmap map = {
918 .mem_start = dev->mem_start,
919 .mem_end = dev->mem_end,
920 .base_addr = dev->base_addr,
921 .irq = dev->irq,
922 .dma = dev->dma,
923 .port = dev->if_port,
924 };
925 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
926 goto nla_put_failure;
927 }
928
929 if (dev->addr_len) {
930 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
931 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
932 goto nla_put_failure;
933 }
934
935 if (rtnl_phys_port_id_fill(skb, dev))
936 goto nla_put_failure;
937
938 attr = nla_reserve(skb, IFLA_STATS,
939 sizeof(struct rtnl_link_stats));
940 if (attr == NULL)
941 goto nla_put_failure;
942
943 stats = dev_get_stats(dev, &temp);
944 copy_rtnl_link_stats(nla_data(attr), stats);
945
946 attr = nla_reserve(skb, IFLA_STATS64,
947 sizeof(struct rtnl_link_stats64));
948 if (attr == NULL)
949 goto nla_put_failure;
950 copy_rtnl_link_stats64(nla_data(attr), stats);
951
952 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
953 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
954 goto nla_put_failure;
955
956 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
957 && (ext_filter_mask & RTEXT_FILTER_VF)) {
958 int i;
959
960 struct nlattr *vfinfo, *vf;
961 int num_vfs = dev_num_vf(dev->dev.parent);
962
963 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
964 if (!vfinfo)
965 goto nla_put_failure;
966 for (i = 0; i < num_vfs; i++) {
967 struct ifla_vf_info ivi;
968 struct ifla_vf_mac vf_mac;
969 struct ifla_vf_vlan vf_vlan;
970 struct ifla_vf_tx_rate vf_tx_rate;
971 struct ifla_vf_spoofchk vf_spoofchk;
972 struct ifla_vf_link_state vf_linkstate;
973
974 /*
975 * Not all SR-IOV capable drivers support the
976 * spoofcheck query. Preset to -1 so the user
977 * space tool can detect that the driver didn't
978 * report anything.
979 */
980 ivi.spoofchk = -1;
981 memset(ivi.mac, 0, sizeof(ivi.mac));
982 /* The default value for VF link state is "auto"
983 * IFLA_VF_LINK_STATE_AUTO which equals zero
984 */
985 ivi.linkstate = 0;
986 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
987 break;
988 vf_mac.vf =
989 vf_vlan.vf =
990 vf_tx_rate.vf =
991 vf_spoofchk.vf =
992 vf_linkstate.vf = ivi.vf;
993
994 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
995 vf_vlan.vlan = ivi.vlan;
996 vf_vlan.qos = ivi.qos;
997 vf_tx_rate.rate = ivi.tx_rate;
998 vf_spoofchk.setting = ivi.spoofchk;
999 vf_linkstate.link_state = ivi.linkstate;
1000 vf = nla_nest_start(skb, IFLA_VF_INFO);
1001 if (!vf) {
1002 nla_nest_cancel(skb, vfinfo);
1003 goto nla_put_failure;
1004 }
1005 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1006 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1007 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1008 &vf_tx_rate) ||
1009 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1010 &vf_spoofchk) ||
1011 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1012 &vf_linkstate))
1013 goto nla_put_failure;
1014 nla_nest_end(skb, vf);
1015 }
1016 nla_nest_end(skb, vfinfo);
1017 }
1018
1019 if (rtnl_port_fill(skb, dev))
1020 goto nla_put_failure;
1021
1022 if (dev->rtnl_link_ops) {
1023 if (rtnl_link_fill(skb, dev) < 0)
1024 goto nla_put_failure;
1025 }
1026
1027 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1028 goto nla_put_failure;
1029
1030 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1031 if (af_ops->fill_link_af) {
1032 struct nlattr *af;
1033 int err;
1034
1035 if (!(af = nla_nest_start(skb, af_ops->family)))
1036 goto nla_put_failure;
1037
1038 err = af_ops->fill_link_af(skb, dev);
1039
1040 /*
1041 * Caller may return ENODATA to indicate that there
1042 * was no data to be dumped. This is not an error, it
1043 * means we should trim the attribute header and
1044 * continue.
1045 */
1046 if (err == -ENODATA)
1047 nla_nest_cancel(skb, af);
1048 else if (err < 0)
1049 goto nla_put_failure;
1050
1051 nla_nest_end(skb, af);
1052 }
1053 }
1054
1055 nla_nest_end(skb, af_spec);
1056
1057 return nlmsg_end(skb, nlh);
1058
1059 nla_put_failure:
1060 nlmsg_cancel(skb, nlh);
1061 return -EMSGSIZE;
1062 }
1063
1064 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1065 {
1066 struct net *net = sock_net(skb->sk);
1067 int h, s_h;
1068 int idx = 0, s_idx;
1069 struct net_device *dev;
1070 struct hlist_head *head;
1071 struct nlattr *tb[IFLA_MAX+1];
1072 u32 ext_filter_mask = 0;
1073
1074 s_h = cb->args[0];
1075 s_idx = cb->args[1];
1076
1077 rcu_read_lock();
1078 cb->seq = net->dev_base_seq;
1079
1080 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1081 ifla_policy) >= 0) {
1082
1083 if (tb[IFLA_EXT_MASK])
1084 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1085 }
1086
1087 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1088 idx = 0;
1089 head = &net->dev_index_head[h];
1090 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1091 if (idx < s_idx)
1092 goto cont;
1093 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1094 NETLINK_CB(cb->skb).portid,
1095 cb->nlh->nlmsg_seq, 0,
1096 NLM_F_MULTI,
1097 ext_filter_mask) <= 0)
1098 goto out;
1099
1100 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1101 cont:
1102 idx++;
1103 }
1104 }
1105 out:
1106 rcu_read_unlock();
1107 cb->args[1] = idx;
1108 cb->args[0] = h;
1109
1110 return skb->len;
1111 }
1112
1113 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1114 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1115 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1116 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1117 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1118 [IFLA_MTU] = { .type = NLA_U32 },
1119 [IFLA_LINK] = { .type = NLA_U32 },
1120 [IFLA_MASTER] = { .type = NLA_U32 },
1121 [IFLA_CARRIER] = { .type = NLA_U8 },
1122 [IFLA_TXQLEN] = { .type = NLA_U32 },
1123 [IFLA_WEIGHT] = { .type = NLA_U32 },
1124 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1125 [IFLA_LINKMODE] = { .type = NLA_U8 },
1126 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1127 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1128 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1129 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1130 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1131 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1132 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1133 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1134 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1135 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1136 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1137 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1138 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
1139 };
1140 EXPORT_SYMBOL(ifla_policy);
1141
1142 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1143 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1144 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1145 };
1146
1147 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1148 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1149 };
1150
1151 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1152 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1153 .len = sizeof(struct ifla_vf_mac) },
1154 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1155 .len = sizeof(struct ifla_vf_vlan) },
1156 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1157 .len = sizeof(struct ifla_vf_tx_rate) },
1158 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY,
1159 .len = sizeof(struct ifla_vf_spoofchk) },
1160 };
1161
1162 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1163 [IFLA_PORT_VF] = { .type = NLA_U32 },
1164 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1165 .len = PORT_PROFILE_MAX },
1166 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1167 .len = sizeof(struct ifla_port_vsi)},
1168 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1169 .len = PORT_UUID_MAX },
1170 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1171 .len = PORT_UUID_MAX },
1172 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1173 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1174 };
1175
1176 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1177 {
1178 struct net *net;
1179 /* Examine the link attributes and figure out which
1180 * network namespace we are talking about.
1181 */
1182 if (tb[IFLA_NET_NS_PID])
1183 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1184 else if (tb[IFLA_NET_NS_FD])
1185 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1186 else
1187 net = get_net(src_net);
1188 return net;
1189 }
1190 EXPORT_SYMBOL(rtnl_link_get_net);
1191
1192 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1193 {
1194 if (dev) {
1195 if (tb[IFLA_ADDRESS] &&
1196 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1197 return -EINVAL;
1198
1199 if (tb[IFLA_BROADCAST] &&
1200 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1201 return -EINVAL;
1202 }
1203
1204 if (tb[IFLA_AF_SPEC]) {
1205 struct nlattr *af;
1206 int rem, err;
1207
1208 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1209 const struct rtnl_af_ops *af_ops;
1210
1211 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1212 return -EAFNOSUPPORT;
1213
1214 if (!af_ops->set_link_af)
1215 return -EOPNOTSUPP;
1216
1217 if (af_ops->validate_link_af) {
1218 err = af_ops->validate_link_af(dev, af);
1219 if (err < 0)
1220 return err;
1221 }
1222 }
1223 }
1224
1225 return 0;
1226 }
1227
1228 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1229 {
1230 int rem, err = -EINVAL;
1231 struct nlattr *vf;
1232 const struct net_device_ops *ops = dev->netdev_ops;
1233
1234 nla_for_each_nested(vf, attr, rem) {
1235 switch (nla_type(vf)) {
1236 case IFLA_VF_MAC: {
1237 struct ifla_vf_mac *ivm;
1238 ivm = nla_data(vf);
1239 err = -EOPNOTSUPP;
1240 if (ops->ndo_set_vf_mac)
1241 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1242 ivm->mac);
1243 break;
1244 }
1245 case IFLA_VF_VLAN: {
1246 struct ifla_vf_vlan *ivv;
1247 ivv = nla_data(vf);
1248 err = -EOPNOTSUPP;
1249 if (ops->ndo_set_vf_vlan)
1250 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1251 ivv->vlan,
1252 ivv->qos);
1253 break;
1254 }
1255 case IFLA_VF_TX_RATE: {
1256 struct ifla_vf_tx_rate *ivt;
1257 ivt = nla_data(vf);
1258 err = -EOPNOTSUPP;
1259 if (ops->ndo_set_vf_tx_rate)
1260 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1261 ivt->rate);
1262 break;
1263 }
1264 case IFLA_VF_SPOOFCHK: {
1265 struct ifla_vf_spoofchk *ivs;
1266 ivs = nla_data(vf);
1267 err = -EOPNOTSUPP;
1268 if (ops->ndo_set_vf_spoofchk)
1269 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1270 ivs->setting);
1271 break;
1272 }
1273 case IFLA_VF_LINK_STATE: {
1274 struct ifla_vf_link_state *ivl;
1275 ivl = nla_data(vf);
1276 err = -EOPNOTSUPP;
1277 if (ops->ndo_set_vf_link_state)
1278 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1279 ivl->link_state);
1280 break;
1281 }
1282 default:
1283 err = -EINVAL;
1284 break;
1285 }
1286 if (err)
1287 break;
1288 }
1289 return err;
1290 }
1291
1292 static int do_set_master(struct net_device *dev, int ifindex)
1293 {
1294 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1295 const struct net_device_ops *ops;
1296 int err;
1297
1298 if (upper_dev) {
1299 if (upper_dev->ifindex == ifindex)
1300 return 0;
1301 ops = upper_dev->netdev_ops;
1302 if (ops->ndo_del_slave) {
1303 err = ops->ndo_del_slave(upper_dev, dev);
1304 if (err)
1305 return err;
1306 } else {
1307 return -EOPNOTSUPP;
1308 }
1309 }
1310
1311 if (ifindex) {
1312 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1313 if (!upper_dev)
1314 return -EINVAL;
1315 ops = upper_dev->netdev_ops;
1316 if (ops->ndo_add_slave) {
1317 err = ops->ndo_add_slave(upper_dev, dev);
1318 if (err)
1319 return err;
1320 } else {
1321 return -EOPNOTSUPP;
1322 }
1323 }
1324 return 0;
1325 }
1326
1327 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1328 struct nlattr **tb, char *ifname, int modified)
1329 {
1330 const struct net_device_ops *ops = dev->netdev_ops;
1331 int err;
1332
1333 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1334 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1335 if (IS_ERR(net)) {
1336 err = PTR_ERR(net);
1337 goto errout;
1338 }
1339 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1340 err = -EPERM;
1341 goto errout;
1342 }
1343 err = dev_change_net_namespace(dev, net, ifname);
1344 put_net(net);
1345 if (err)
1346 goto errout;
1347 modified = 1;
1348 }
1349
1350 if (tb[IFLA_MAP]) {
1351 struct rtnl_link_ifmap *u_map;
1352 struct ifmap k_map;
1353
1354 if (!ops->ndo_set_config) {
1355 err = -EOPNOTSUPP;
1356 goto errout;
1357 }
1358
1359 if (!netif_device_present(dev)) {
1360 err = -ENODEV;
1361 goto errout;
1362 }
1363
1364 u_map = nla_data(tb[IFLA_MAP]);
1365 k_map.mem_start = (unsigned long) u_map->mem_start;
1366 k_map.mem_end = (unsigned long) u_map->mem_end;
1367 k_map.base_addr = (unsigned short) u_map->base_addr;
1368 k_map.irq = (unsigned char) u_map->irq;
1369 k_map.dma = (unsigned char) u_map->dma;
1370 k_map.port = (unsigned char) u_map->port;
1371
1372 err = ops->ndo_set_config(dev, &k_map);
1373 if (err < 0)
1374 goto errout;
1375
1376 modified = 1;
1377 }
1378
1379 if (tb[IFLA_ADDRESS]) {
1380 struct sockaddr *sa;
1381 int len;
1382
1383 len = sizeof(sa_family_t) + dev->addr_len;
1384 sa = kmalloc(len, GFP_KERNEL);
1385 if (!sa) {
1386 err = -ENOMEM;
1387 goto errout;
1388 }
1389 sa->sa_family = dev->type;
1390 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1391 dev->addr_len);
1392 err = dev_set_mac_address(dev, sa);
1393 kfree(sa);
1394 if (err)
1395 goto errout;
1396 modified = 1;
1397 }
1398
1399 if (tb[IFLA_MTU]) {
1400 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1401 if (err < 0)
1402 goto errout;
1403 modified = 1;
1404 }
1405
1406 if (tb[IFLA_GROUP]) {
1407 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1408 modified = 1;
1409 }
1410
1411 /*
1412 * Interface selected by interface index but interface
1413 * name provided implies that a name change has been
1414 * requested.
1415 */
1416 if (ifm->ifi_index > 0 && ifname[0]) {
1417 err = dev_change_name(dev, ifname);
1418 if (err < 0)
1419 goto errout;
1420 modified = 1;
1421 }
1422
1423 if (tb[IFLA_IFALIAS]) {
1424 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1425 nla_len(tb[IFLA_IFALIAS]));
1426 if (err < 0)
1427 goto errout;
1428 modified = 1;
1429 }
1430
1431 if (tb[IFLA_BROADCAST]) {
1432 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1433 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1434 }
1435
1436 if (ifm->ifi_flags || ifm->ifi_change) {
1437 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1438 if (err < 0)
1439 goto errout;
1440 }
1441
1442 if (tb[IFLA_MASTER]) {
1443 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1444 if (err)
1445 goto errout;
1446 modified = 1;
1447 }
1448
1449 if (tb[IFLA_CARRIER]) {
1450 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1451 if (err)
1452 goto errout;
1453 modified = 1;
1454 }
1455
1456 if (tb[IFLA_TXQLEN])
1457 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1458
1459 if (tb[IFLA_OPERSTATE])
1460 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1461
1462 if (tb[IFLA_LINKMODE]) {
1463 write_lock_bh(&dev_base_lock);
1464 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1465 write_unlock_bh(&dev_base_lock);
1466 }
1467
1468 if (tb[IFLA_VFINFO_LIST]) {
1469 struct nlattr *attr;
1470 int rem;
1471 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1472 if (nla_type(attr) != IFLA_VF_INFO) {
1473 err = -EINVAL;
1474 goto errout;
1475 }
1476 err = do_setvfinfo(dev, attr);
1477 if (err < 0)
1478 goto errout;
1479 modified = 1;
1480 }
1481 }
1482 err = 0;
1483
1484 if (tb[IFLA_VF_PORTS]) {
1485 struct nlattr *port[IFLA_PORT_MAX+1];
1486 struct nlattr *attr;
1487 int vf;
1488 int rem;
1489
1490 err = -EOPNOTSUPP;
1491 if (!ops->ndo_set_vf_port)
1492 goto errout;
1493
1494 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1495 if (nla_type(attr) != IFLA_VF_PORT)
1496 continue;
1497 err = nla_parse_nested(port, IFLA_PORT_MAX,
1498 attr, ifla_port_policy);
1499 if (err < 0)
1500 goto errout;
1501 if (!port[IFLA_PORT_VF]) {
1502 err = -EOPNOTSUPP;
1503 goto errout;
1504 }
1505 vf = nla_get_u32(port[IFLA_PORT_VF]);
1506 err = ops->ndo_set_vf_port(dev, vf, port);
1507 if (err < 0)
1508 goto errout;
1509 modified = 1;
1510 }
1511 }
1512 err = 0;
1513
1514 if (tb[IFLA_PORT_SELF]) {
1515 struct nlattr *port[IFLA_PORT_MAX+1];
1516
1517 err = nla_parse_nested(port, IFLA_PORT_MAX,
1518 tb[IFLA_PORT_SELF], ifla_port_policy);
1519 if (err < 0)
1520 goto errout;
1521
1522 err = -EOPNOTSUPP;
1523 if (ops->ndo_set_vf_port)
1524 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1525 if (err < 0)
1526 goto errout;
1527 modified = 1;
1528 }
1529
1530 if (tb[IFLA_AF_SPEC]) {
1531 struct nlattr *af;
1532 int rem;
1533
1534 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1535 const struct rtnl_af_ops *af_ops;
1536
1537 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1538 BUG();
1539
1540 err = af_ops->set_link_af(dev, af);
1541 if (err < 0)
1542 goto errout;
1543
1544 modified = 1;
1545 }
1546 }
1547 err = 0;
1548
1549 errout:
1550 if (err < 0 && modified)
1551 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",
1552 dev->name);
1553
1554 return err;
1555 }
1556
1557 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1558 {
1559 struct net *net = sock_net(skb->sk);
1560 struct ifinfomsg *ifm;
1561 struct net_device *dev;
1562 int err;
1563 struct nlattr *tb[IFLA_MAX+1];
1564 char ifname[IFNAMSIZ];
1565
1566 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1567 if (err < 0)
1568 goto errout;
1569
1570 if (tb[IFLA_IFNAME])
1571 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1572 else
1573 ifname[0] = '\0';
1574
1575 err = -EINVAL;
1576 ifm = nlmsg_data(nlh);
1577 if (ifm->ifi_index > 0)
1578 dev = __dev_get_by_index(net, ifm->ifi_index);
1579 else if (tb[IFLA_IFNAME])
1580 dev = __dev_get_by_name(net, ifname);
1581 else
1582 goto errout;
1583
1584 if (dev == NULL) {
1585 err = -ENODEV;
1586 goto errout;
1587 }
1588
1589 err = validate_linkmsg(dev, tb);
1590 if (err < 0)
1591 goto errout;
1592
1593 err = do_setlink(dev, ifm, tb, ifname, 0);
1594 errout:
1595 return err;
1596 }
1597
1598 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1599 {
1600 struct net *net = sock_net(skb->sk);
1601 const struct rtnl_link_ops *ops;
1602 struct net_device *dev;
1603 struct ifinfomsg *ifm;
1604 char ifname[IFNAMSIZ];
1605 struct nlattr *tb[IFLA_MAX+1];
1606 int err;
1607 LIST_HEAD(list_kill);
1608
1609 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1610 if (err < 0)
1611 return err;
1612
1613 if (tb[IFLA_IFNAME])
1614 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1615
1616 ifm = nlmsg_data(nlh);
1617 if (ifm->ifi_index > 0)
1618 dev = __dev_get_by_index(net, ifm->ifi_index);
1619 else if (tb[IFLA_IFNAME])
1620 dev = __dev_get_by_name(net, ifname);
1621 else
1622 return -EINVAL;
1623
1624 if (!dev)
1625 return -ENODEV;
1626
1627 ops = dev->rtnl_link_ops;
1628 if (!ops)
1629 return -EOPNOTSUPP;
1630
1631 ops->dellink(dev, &list_kill);
1632 unregister_netdevice_many(&list_kill);
1633 list_del(&list_kill);
1634 return 0;
1635 }
1636
1637 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1638 {
1639 unsigned int old_flags;
1640 int err;
1641
1642 old_flags = dev->flags;
1643 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1644 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1645 if (err < 0)
1646 return err;
1647 }
1648
1649 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1650 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1651
1652 __dev_notify_flags(dev, old_flags);
1653 return 0;
1654 }
1655 EXPORT_SYMBOL(rtnl_configure_link);
1656
1657 struct net_device *rtnl_create_link(struct net *net,
1658 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1659 {
1660 int err;
1661 struct net_device *dev;
1662 unsigned int num_tx_queues = 1;
1663 unsigned int num_rx_queues = 1;
1664
1665 if (tb[IFLA_NUM_TX_QUEUES])
1666 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1667 else if (ops->get_num_tx_queues)
1668 num_tx_queues = ops->get_num_tx_queues();
1669
1670 if (tb[IFLA_NUM_RX_QUEUES])
1671 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1672 else if (ops->get_num_rx_queues)
1673 num_rx_queues = ops->get_num_rx_queues();
1674
1675 err = -ENOMEM;
1676 dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup,
1677 num_tx_queues, num_rx_queues);
1678 if (!dev)
1679 goto err;
1680
1681 dev_net_set(dev, net);
1682 dev->rtnl_link_ops = ops;
1683 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1684
1685 if (tb[IFLA_MTU])
1686 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1687 if (tb[IFLA_ADDRESS]) {
1688 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1689 nla_len(tb[IFLA_ADDRESS]));
1690 dev->addr_assign_type = NET_ADDR_SET;
1691 }
1692 if (tb[IFLA_BROADCAST])
1693 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1694 nla_len(tb[IFLA_BROADCAST]));
1695 if (tb[IFLA_TXQLEN])
1696 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1697 if (tb[IFLA_OPERSTATE])
1698 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1699 if (tb[IFLA_LINKMODE])
1700 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1701 if (tb[IFLA_GROUP])
1702 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1703
1704 return dev;
1705
1706 err:
1707 return ERR_PTR(err);
1708 }
1709 EXPORT_SYMBOL(rtnl_create_link);
1710
1711 static int rtnl_group_changelink(struct net *net, int group,
1712 struct ifinfomsg *ifm,
1713 struct nlattr **tb)
1714 {
1715 struct net_device *dev;
1716 int err;
1717
1718 for_each_netdev(net, dev) {
1719 if (dev->group == group) {
1720 err = do_setlink(dev, ifm, tb, NULL, 0);
1721 if (err < 0)
1722 return err;
1723 }
1724 }
1725
1726 return 0;
1727 }
1728
1729 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1730 {
1731 struct net *net = sock_net(skb->sk);
1732 const struct rtnl_link_ops *ops;
1733 struct net_device *dev;
1734 struct ifinfomsg *ifm;
1735 char kind[MODULE_NAME_LEN];
1736 char ifname[IFNAMSIZ];
1737 struct nlattr *tb[IFLA_MAX+1];
1738 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1739 int err;
1740
1741 #ifdef CONFIG_MODULES
1742 replay:
1743 #endif
1744 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1745 if (err < 0)
1746 return err;
1747
1748 if (tb[IFLA_IFNAME])
1749 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1750 else
1751 ifname[0] = '\0';
1752
1753 ifm = nlmsg_data(nlh);
1754 if (ifm->ifi_index > 0)
1755 dev = __dev_get_by_index(net, ifm->ifi_index);
1756 else {
1757 if (ifname[0])
1758 dev = __dev_get_by_name(net, ifname);
1759 else
1760 dev = NULL;
1761 }
1762
1763 err = validate_linkmsg(dev, tb);
1764 if (err < 0)
1765 return err;
1766
1767 if (tb[IFLA_LINKINFO]) {
1768 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1769 tb[IFLA_LINKINFO], ifla_info_policy);
1770 if (err < 0)
1771 return err;
1772 } else
1773 memset(linkinfo, 0, sizeof(linkinfo));
1774
1775 if (linkinfo[IFLA_INFO_KIND]) {
1776 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1777 ops = rtnl_link_ops_get(kind);
1778 } else {
1779 kind[0] = '\0';
1780 ops = NULL;
1781 }
1782
1783 if (1) {
1784 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1785 struct net *dest_net;
1786
1787 if (ops) {
1788 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1789 err = nla_parse_nested(attr, ops->maxtype,
1790 linkinfo[IFLA_INFO_DATA],
1791 ops->policy);
1792 if (err < 0)
1793 return err;
1794 data = attr;
1795 }
1796 if (ops->validate) {
1797 err = ops->validate(tb, data);
1798 if (err < 0)
1799 return err;
1800 }
1801 }
1802
1803 if (dev) {
1804 int modified = 0;
1805
1806 if (nlh->nlmsg_flags & NLM_F_EXCL)
1807 return -EEXIST;
1808 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1809 return -EOPNOTSUPP;
1810
1811 if (linkinfo[IFLA_INFO_DATA]) {
1812 if (!ops || ops != dev->rtnl_link_ops ||
1813 !ops->changelink)
1814 return -EOPNOTSUPP;
1815
1816 err = ops->changelink(dev, tb, data);
1817 if (err < 0)
1818 return err;
1819 modified = 1;
1820 }
1821
1822 return do_setlink(dev, ifm, tb, ifname, modified);
1823 }
1824
1825 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1826 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1827 return rtnl_group_changelink(net,
1828 nla_get_u32(tb[IFLA_GROUP]),
1829 ifm, tb);
1830 return -ENODEV;
1831 }
1832
1833 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1834 return -EOPNOTSUPP;
1835
1836 if (!ops) {
1837 #ifdef CONFIG_MODULES
1838 if (kind[0]) {
1839 __rtnl_unlock();
1840 request_module("rtnl-link-%s", kind);
1841 rtnl_lock();
1842 ops = rtnl_link_ops_get(kind);
1843 if (ops)
1844 goto replay;
1845 }
1846 #endif
1847 return -EOPNOTSUPP;
1848 }
1849
1850 if (!ifname[0])
1851 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1852
1853 dest_net = rtnl_link_get_net(net, tb);
1854 if (IS_ERR(dest_net))
1855 return PTR_ERR(dest_net);
1856
1857 dev = rtnl_create_link(dest_net, ifname, ops, tb);
1858 if (IS_ERR(dev)) {
1859 err = PTR_ERR(dev);
1860 goto out;
1861 }
1862
1863 dev->ifindex = ifm->ifi_index;
1864
1865 if (ops->newlink)
1866 err = ops->newlink(net, dev, tb, data);
1867 else
1868 err = register_netdevice(dev);
1869
1870 if (err < 0) {
1871 free_netdev(dev);
1872 goto out;
1873 }
1874
1875 err = rtnl_configure_link(dev, ifm);
1876 if (err < 0)
1877 unregister_netdevice(dev);
1878 out:
1879 put_net(dest_net);
1880 return err;
1881 }
1882 }
1883
1884 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
1885 {
1886 struct net *net = sock_net(skb->sk);
1887 struct ifinfomsg *ifm;
1888 char ifname[IFNAMSIZ];
1889 struct nlattr *tb[IFLA_MAX+1];
1890 struct net_device *dev = NULL;
1891 struct sk_buff *nskb;
1892 int err;
1893 u32 ext_filter_mask = 0;
1894
1895 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1896 if (err < 0)
1897 return err;
1898
1899 if (tb[IFLA_IFNAME])
1900 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1901
1902 if (tb[IFLA_EXT_MASK])
1903 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1904
1905 ifm = nlmsg_data(nlh);
1906 if (ifm->ifi_index > 0)
1907 dev = __dev_get_by_index(net, ifm->ifi_index);
1908 else if (tb[IFLA_IFNAME])
1909 dev = __dev_get_by_name(net, ifname);
1910 else
1911 return -EINVAL;
1912
1913 if (dev == NULL)
1914 return -ENODEV;
1915
1916 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1917 if (nskb == NULL)
1918 return -ENOBUFS;
1919
1920 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
1921 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1922 if (err < 0) {
1923 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1924 WARN_ON(err == -EMSGSIZE);
1925 kfree_skb(nskb);
1926 } else
1927 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
1928
1929 return err;
1930 }
1931
1932 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1933 {
1934 struct net *net = sock_net(skb->sk);
1935 struct net_device *dev;
1936 struct nlattr *tb[IFLA_MAX+1];
1937 u32 ext_filter_mask = 0;
1938 u16 min_ifinfo_dump_size = 0;
1939
1940 if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1941 ifla_policy) >= 0) {
1942 if (tb[IFLA_EXT_MASK])
1943 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1944 }
1945
1946 if (!ext_filter_mask)
1947 return NLMSG_GOODSIZE;
1948 /*
1949 * traverse the list of net devices and compute the minimum
1950 * buffer size based upon the filter mask.
1951 */
1952 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1953 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1954 if_nlmsg_size(dev,
1955 ext_filter_mask));
1956 }
1957
1958 return min_ifinfo_dump_size;
1959 }
1960
1961 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1962 {
1963 int idx;
1964 int s_idx = cb->family;
1965
1966 if (s_idx == 0)
1967 s_idx = 1;
1968 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1969 int type = cb->nlh->nlmsg_type-RTM_BASE;
1970 if (idx < s_idx || idx == PF_PACKET)
1971 continue;
1972 if (rtnl_msg_handlers[idx] == NULL ||
1973 rtnl_msg_handlers[idx][type].dumpit == NULL)
1974 continue;
1975 if (idx > s_idx) {
1976 memset(&cb->args[0], 0, sizeof(cb->args));
1977 cb->prev_seq = 0;
1978 cb->seq = 0;
1979 }
1980 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1981 break;
1982 }
1983 cb->family = idx;
1984
1985 return skb->len;
1986 }
1987
1988 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change)
1989 {
1990 struct net *net = dev_net(dev);
1991 struct sk_buff *skb;
1992 int err = -ENOBUFS;
1993 size_t if_info_size;
1994
1995 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1996 if (skb == NULL)
1997 goto errout;
1998
1999 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2000 if (err < 0) {
2001 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2002 WARN_ON(err == -EMSGSIZE);
2003 kfree_skb(skb);
2004 goto errout;
2005 }
2006 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
2007 return;
2008 errout:
2009 if (err < 0)
2010 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2011 }
2012 EXPORT_SYMBOL(rtmsg_ifinfo);
2013
2014 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2015 struct net_device *dev,
2016 u8 *addr, u32 pid, u32 seq,
2017 int type, unsigned int flags)
2018 {
2019 struct nlmsghdr *nlh;
2020 struct ndmsg *ndm;
2021
2022 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), NLM_F_MULTI);
2023 if (!nlh)
2024 return -EMSGSIZE;
2025
2026 ndm = nlmsg_data(nlh);
2027 ndm->ndm_family = AF_BRIDGE;
2028 ndm->ndm_pad1 = 0;
2029 ndm->ndm_pad2 = 0;
2030 ndm->ndm_flags = flags;
2031 ndm->ndm_type = 0;
2032 ndm->ndm_ifindex = dev->ifindex;
2033 ndm->ndm_state = NUD_PERMANENT;
2034
2035 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2036 goto nla_put_failure;
2037
2038 return nlmsg_end(skb, nlh);
2039
2040 nla_put_failure:
2041 nlmsg_cancel(skb, nlh);
2042 return -EMSGSIZE;
2043 }
2044
2045 static inline size_t rtnl_fdb_nlmsg_size(void)
2046 {
2047 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2048 }
2049
2050 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2051 {
2052 struct net *net = dev_net(dev);
2053 struct sk_buff *skb;
2054 int err = -ENOBUFS;
2055
2056 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2057 if (!skb)
2058 goto errout;
2059
2060 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF);
2061 if (err < 0) {
2062 kfree_skb(skb);
2063 goto errout;
2064 }
2065
2066 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2067 return;
2068 errout:
2069 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2070 }
2071
2072 /**
2073 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2074 */
2075 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2076 struct nlattr *tb[],
2077 struct net_device *dev,
2078 const unsigned char *addr,
2079 u16 flags)
2080 {
2081 int err = -EINVAL;
2082
2083 /* If aging addresses are supported device will need to
2084 * implement its own handler for this.
2085 */
2086 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2087 pr_info("%s: FDB only supports static addresses\n", dev->name);
2088 return err;
2089 }
2090
2091 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2092 err = dev_uc_add_excl(dev, addr);
2093 else if (is_multicast_ether_addr(addr))
2094 err = dev_mc_add_excl(dev, addr);
2095
2096 /* Only return duplicate errors if NLM_F_EXCL is set */
2097 if (err == -EEXIST && !(flags & NLM_F_EXCL))
2098 err = 0;
2099
2100 return err;
2101 }
2102 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2103
2104 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2105 {
2106 struct net *net = sock_net(skb->sk);
2107 struct ndmsg *ndm;
2108 struct nlattr *tb[NDA_MAX+1];
2109 struct net_device *dev;
2110 u8 *addr;
2111 int err;
2112
2113 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2114 if (err < 0)
2115 return err;
2116
2117 ndm = nlmsg_data(nlh);
2118 if (ndm->ndm_ifindex == 0) {
2119 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2120 return -EINVAL;
2121 }
2122
2123 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2124 if (dev == NULL) {
2125 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2126 return -ENODEV;
2127 }
2128
2129 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2130 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2131 return -EINVAL;
2132 }
2133
2134 addr = nla_data(tb[NDA_LLADDR]);
2135
2136 err = -EOPNOTSUPP;
2137
2138 /* Support fdb on master device the net/bridge default case */
2139 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2140 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2141 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2142 const struct net_device_ops *ops = br_dev->netdev_ops;
2143
2144 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2145 if (err)
2146 goto out;
2147 else
2148 ndm->ndm_flags &= ~NTF_MASTER;
2149 }
2150
2151 /* Embedded bridge, macvlan, and any other device support */
2152 if ((ndm->ndm_flags & NTF_SELF)) {
2153 if (dev->netdev_ops->ndo_fdb_add)
2154 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2155 nlh->nlmsg_flags);
2156 else
2157 err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2158 nlh->nlmsg_flags);
2159
2160 if (!err) {
2161 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2162 ndm->ndm_flags &= ~NTF_SELF;
2163 }
2164 }
2165 out:
2166 return err;
2167 }
2168
2169 /**
2170 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2171 */
2172 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2173 struct nlattr *tb[],
2174 struct net_device *dev,
2175 const unsigned char *addr)
2176 {
2177 int err = -EOPNOTSUPP;
2178
2179 /* If aging addresses are supported device will need to
2180 * implement its own handler for this.
2181 */
2182 if (!(ndm->ndm_state & NUD_PERMANENT)) {
2183 pr_info("%s: FDB only supports static addresses\n", dev->name);
2184 return -EINVAL;
2185 }
2186
2187 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2188 err = dev_uc_del(dev, addr);
2189 else if (is_multicast_ether_addr(addr))
2190 err = dev_mc_del(dev, addr);
2191 else
2192 err = -EINVAL;
2193
2194 return err;
2195 }
2196 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2197
2198 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2199 {
2200 struct net *net = sock_net(skb->sk);
2201 struct ndmsg *ndm;
2202 struct nlattr *tb[NDA_MAX+1];
2203 struct net_device *dev;
2204 int err = -EINVAL;
2205 __u8 *addr;
2206
2207 if (!capable(CAP_NET_ADMIN))
2208 return -EPERM;
2209
2210 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2211 if (err < 0)
2212 return err;
2213
2214 ndm = nlmsg_data(nlh);
2215 if (ndm->ndm_ifindex == 0) {
2216 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2217 return -EINVAL;
2218 }
2219
2220 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2221 if (dev == NULL) {
2222 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2223 return -ENODEV;
2224 }
2225
2226 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2227 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2228 return -EINVAL;
2229 }
2230
2231 addr = nla_data(tb[NDA_LLADDR]);
2232
2233 err = -EOPNOTSUPP;
2234
2235 /* Support fdb on master device the net/bridge default case */
2236 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2237 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2238 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2239 const struct net_device_ops *ops = br_dev->netdev_ops;
2240
2241 if (ops->ndo_fdb_del)
2242 err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2243
2244 if (err)
2245 goto out;
2246 else
2247 ndm->ndm_flags &= ~NTF_MASTER;
2248 }
2249
2250 /* Embedded bridge, macvlan, and any other device support */
2251 if (ndm->ndm_flags & NTF_SELF) {
2252 if (dev->netdev_ops->ndo_fdb_del)
2253 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2254 else
2255 err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2256
2257 if (!err) {
2258 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2259 ndm->ndm_flags &= ~NTF_SELF;
2260 }
2261 }
2262 out:
2263 return err;
2264 }
2265
2266 static int nlmsg_populate_fdb(struct sk_buff *skb,
2267 struct netlink_callback *cb,
2268 struct net_device *dev,
2269 int *idx,
2270 struct netdev_hw_addr_list *list)
2271 {
2272 struct netdev_hw_addr *ha;
2273 int err;
2274 u32 portid, seq;
2275
2276 portid = NETLINK_CB(cb->skb).portid;
2277 seq = cb->nlh->nlmsg_seq;
2278
2279 list_for_each_entry(ha, &list->list, list) {
2280 if (*idx < cb->args[0])
2281 goto skip;
2282
2283 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2284 portid, seq,
2285 RTM_NEWNEIGH, NTF_SELF);
2286 if (err < 0)
2287 return err;
2288 skip:
2289 *idx += 1;
2290 }
2291 return 0;
2292 }
2293
2294 /**
2295 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2296 * @nlh: netlink message header
2297 * @dev: netdevice
2298 *
2299 * Default netdevice operation to dump the existing unicast address list.
2300 * Returns number of addresses from list put in skb.
2301 */
2302 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2303 struct netlink_callback *cb,
2304 struct net_device *dev,
2305 int idx)
2306 {
2307 int err;
2308
2309 netif_addr_lock_bh(dev);
2310 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2311 if (err)
2312 goto out;
2313 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2314 out:
2315 netif_addr_unlock_bh(dev);
2316 return idx;
2317 }
2318 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2319
2320 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2321 {
2322 int idx = 0;
2323 struct net *net = sock_net(skb->sk);
2324 struct net_device *dev;
2325
2326 rcu_read_lock();
2327 for_each_netdev_rcu(net, dev) {
2328 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2329 struct net_device *br_dev;
2330 const struct net_device_ops *ops;
2331
2332 br_dev = netdev_master_upper_dev_get(dev);
2333 ops = br_dev->netdev_ops;
2334 if (ops->ndo_fdb_dump)
2335 idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
2336 }
2337
2338 if (dev->netdev_ops->ndo_fdb_dump)
2339 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
2340 else
2341 idx = ndo_dflt_fdb_dump(skb, cb, dev, idx);
2342 }
2343 rcu_read_unlock();
2344
2345 cb->args[0] = idx;
2346 return skb->len;
2347 }
2348
2349 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2350 struct net_device *dev, u16 mode)
2351 {
2352 struct nlmsghdr *nlh;
2353 struct ifinfomsg *ifm;
2354 struct nlattr *br_afspec;
2355 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2356 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2357
2358 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2359 if (nlh == NULL)
2360 return -EMSGSIZE;
2361
2362 ifm = nlmsg_data(nlh);
2363 ifm->ifi_family = AF_BRIDGE;
2364 ifm->__ifi_pad = 0;
2365 ifm->ifi_type = dev->type;
2366 ifm->ifi_index = dev->ifindex;
2367 ifm->ifi_flags = dev_get_flags(dev);
2368 ifm->ifi_change = 0;
2369
2370
2371 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2372 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2373 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2374 (br_dev &&
2375 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2376 (dev->addr_len &&
2377 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2378 (dev->ifindex != dev->iflink &&
2379 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2380 goto nla_put_failure;
2381
2382 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2383 if (!br_afspec)
2384 goto nla_put_failure;
2385
2386 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2387 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2388 nla_nest_cancel(skb, br_afspec);
2389 goto nla_put_failure;
2390 }
2391 nla_nest_end(skb, br_afspec);
2392
2393 return nlmsg_end(skb, nlh);
2394 nla_put_failure:
2395 nlmsg_cancel(skb, nlh);
2396 return -EMSGSIZE;
2397 }
2398 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2399
2400 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2401 {
2402 struct net *net = sock_net(skb->sk);
2403 struct net_device *dev;
2404 int idx = 0;
2405 u32 portid = NETLINK_CB(cb->skb).portid;
2406 u32 seq = cb->nlh->nlmsg_seq;
2407 struct nlattr *extfilt;
2408 u32 filter_mask = 0;
2409
2410 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2411 IFLA_EXT_MASK);
2412 if (extfilt)
2413 filter_mask = nla_get_u32(extfilt);
2414
2415 rcu_read_lock();
2416 for_each_netdev_rcu(net, dev) {
2417 const struct net_device_ops *ops = dev->netdev_ops;
2418 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2419
2420 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2421 if (idx >= cb->args[0] &&
2422 br_dev->netdev_ops->ndo_bridge_getlink(
2423 skb, portid, seq, dev, filter_mask) < 0)
2424 break;
2425 idx++;
2426 }
2427
2428 if (ops->ndo_bridge_getlink) {
2429 if (idx >= cb->args[0] &&
2430 ops->ndo_bridge_getlink(skb, portid, seq, dev,
2431 filter_mask) < 0)
2432 break;
2433 idx++;
2434 }
2435 }
2436 rcu_read_unlock();
2437 cb->args[0] = idx;
2438
2439 return skb->len;
2440 }
2441
2442 static inline size_t bridge_nlmsg_size(void)
2443 {
2444 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2445 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
2446 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
2447 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
2448 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
2449 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
2450 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
2451 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
2452 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2453 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
2454 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
2455 }
2456
2457 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2458 {
2459 struct net *net = dev_net(dev);
2460 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2461 struct sk_buff *skb;
2462 int err = -EOPNOTSUPP;
2463
2464 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2465 if (!skb) {
2466 err = -ENOMEM;
2467 goto errout;
2468 }
2469
2470 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2471 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2472 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2473 if (err < 0)
2474 goto errout;
2475 }
2476
2477 if ((flags & BRIDGE_FLAGS_SELF) &&
2478 dev->netdev_ops->ndo_bridge_getlink) {
2479 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2480 if (err < 0)
2481 goto errout;
2482 }
2483
2484 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2485 return 0;
2486 errout:
2487 WARN_ON(err == -EMSGSIZE);
2488 kfree_skb(skb);
2489 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2490 return err;
2491 }
2492
2493 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2494 {
2495 struct net *net = sock_net(skb->sk);
2496 struct ifinfomsg *ifm;
2497 struct net_device *dev;
2498 struct nlattr *br_spec, *attr = NULL;
2499 int rem, err = -EOPNOTSUPP;
2500 u16 oflags, flags = 0;
2501 bool have_flags = false;
2502
2503 if (nlmsg_len(nlh) < sizeof(*ifm))
2504 return -EINVAL;
2505
2506 ifm = nlmsg_data(nlh);
2507 if (ifm->ifi_family != AF_BRIDGE)
2508 return -EPFNOSUPPORT;
2509
2510 dev = __dev_get_by_index(net, ifm->ifi_index);
2511 if (!dev) {
2512 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2513 return -ENODEV;
2514 }
2515
2516 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2517 if (br_spec) {
2518 nla_for_each_nested(attr, br_spec, rem) {
2519 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2520 have_flags = true;
2521 flags = nla_get_u16(attr);
2522 break;
2523 }
2524 }
2525 }
2526
2527 oflags = flags;
2528
2529 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2530 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2531
2532 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2533 err = -EOPNOTSUPP;
2534 goto out;
2535 }
2536
2537 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2538 if (err)
2539 goto out;
2540
2541 flags &= ~BRIDGE_FLAGS_MASTER;
2542 }
2543
2544 if ((flags & BRIDGE_FLAGS_SELF)) {
2545 if (!dev->netdev_ops->ndo_bridge_setlink)
2546 err = -EOPNOTSUPP;
2547 else
2548 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2549
2550 if (!err)
2551 flags &= ~BRIDGE_FLAGS_SELF;
2552 }
2553
2554 if (have_flags)
2555 memcpy(nla_data(attr), &flags, sizeof(flags));
2556 /* Generate event to notify upper layer of bridge change */
2557 if (!err)
2558 err = rtnl_bridge_notify(dev, oflags);
2559 out:
2560 return err;
2561 }
2562
2563 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2564 {
2565 struct net *net = sock_net(skb->sk);
2566 struct ifinfomsg *ifm;
2567 struct net_device *dev;
2568 struct nlattr *br_spec, *attr = NULL;
2569 int rem, err = -EOPNOTSUPP;
2570 u16 oflags, flags = 0;
2571 bool have_flags = false;
2572
2573 if (nlmsg_len(nlh) < sizeof(*ifm))
2574 return -EINVAL;
2575
2576 ifm = nlmsg_data(nlh);
2577 if (ifm->ifi_family != AF_BRIDGE)
2578 return -EPFNOSUPPORT;
2579
2580 dev = __dev_get_by_index(net, ifm->ifi_index);
2581 if (!dev) {
2582 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2583 return -ENODEV;
2584 }
2585
2586 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2587 if (br_spec) {
2588 nla_for_each_nested(attr, br_spec, rem) {
2589 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2590 have_flags = true;
2591 flags = nla_get_u16(attr);
2592 break;
2593 }
2594 }
2595 }
2596
2597 oflags = flags;
2598
2599 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2600 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2601
2602 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2603 err = -EOPNOTSUPP;
2604 goto out;
2605 }
2606
2607 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2608 if (err)
2609 goto out;
2610
2611 flags &= ~BRIDGE_FLAGS_MASTER;
2612 }
2613
2614 if ((flags & BRIDGE_FLAGS_SELF)) {
2615 if (!dev->netdev_ops->ndo_bridge_dellink)
2616 err = -EOPNOTSUPP;
2617 else
2618 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2619
2620 if (!err)
2621 flags &= ~BRIDGE_FLAGS_SELF;
2622 }
2623
2624 if (have_flags)
2625 memcpy(nla_data(attr), &flags, sizeof(flags));
2626 /* Generate event to notify upper layer of bridge change */
2627 if (!err)
2628 err = rtnl_bridge_notify(dev, oflags);
2629 out:
2630 return err;
2631 }
2632
2633 /* Process one rtnetlink message. */
2634
2635 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2636 {
2637 struct net *net = sock_net(skb->sk);
2638 rtnl_doit_func doit;
2639 int sz_idx, kind;
2640 int family;
2641 int type;
2642 int err;
2643
2644 type = nlh->nlmsg_type;
2645 if (type > RTM_MAX)
2646 return -EOPNOTSUPP;
2647
2648 type -= RTM_BASE;
2649
2650 /* All the messages must have at least 1 byte length */
2651 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2652 return 0;
2653
2654 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2655 sz_idx = type>>2;
2656 kind = type&3;
2657
2658 if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN))
2659 return -EPERM;
2660
2661 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2662 struct sock *rtnl;
2663 rtnl_dumpit_func dumpit;
2664 rtnl_calcit_func calcit;
2665 u16 min_dump_alloc = 0;
2666
2667 dumpit = rtnl_get_dumpit(family, type);
2668 if (dumpit == NULL)
2669 return -EOPNOTSUPP;
2670 calcit = rtnl_get_calcit(family, type);
2671 if (calcit)
2672 min_dump_alloc = calcit(skb, nlh);
2673
2674 __rtnl_unlock();
2675 rtnl = net->rtnl;
2676 {
2677 struct netlink_dump_control c = {
2678 .dump = dumpit,
2679 .min_dump_alloc = min_dump_alloc,
2680 };
2681 err = netlink_dump_start(rtnl, skb, nlh, &c);
2682 }
2683 rtnl_lock();
2684 return err;
2685 }
2686
2687 doit = rtnl_get_doit(family, type);
2688 if (doit == NULL)
2689 return -EOPNOTSUPP;
2690
2691 return doit(skb, nlh);
2692 }
2693
2694 static void rtnetlink_rcv(struct sk_buff *skb)
2695 {
2696 rtnl_lock();
2697 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2698 rtnl_unlock();
2699 }
2700
2701 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2702 {
2703 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2704
2705 switch (event) {
2706 case NETDEV_UP:
2707 case NETDEV_DOWN:
2708 case NETDEV_PRE_UP:
2709 case NETDEV_POST_INIT:
2710 case NETDEV_REGISTER:
2711 case NETDEV_CHANGE:
2712 case NETDEV_PRE_TYPE_CHANGE:
2713 case NETDEV_GOING_DOWN:
2714 case NETDEV_UNREGISTER:
2715 case NETDEV_UNREGISTER_FINAL:
2716 case NETDEV_RELEASE:
2717 case NETDEV_JOIN:
2718 break;
2719 default:
2720 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2721 break;
2722 }
2723 return NOTIFY_DONE;
2724 }
2725
2726 static struct notifier_block rtnetlink_dev_notifier = {
2727 .notifier_call = rtnetlink_event,
2728 };
2729
2730
2731 static int __net_init rtnetlink_net_init(struct net *net)
2732 {
2733 struct sock *sk;
2734 struct netlink_kernel_cfg cfg = {
2735 .groups = RTNLGRP_MAX,
2736 .input = rtnetlink_rcv,
2737 .cb_mutex = &rtnl_mutex,
2738 .flags = NL_CFG_F_NONROOT_RECV,
2739 };
2740
2741 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
2742 if (!sk)
2743 return -ENOMEM;
2744 net->rtnl = sk;
2745 return 0;
2746 }
2747
2748 static void __net_exit rtnetlink_net_exit(struct net *net)
2749 {
2750 netlink_kernel_release(net->rtnl);
2751 net->rtnl = NULL;
2752 }
2753
2754 static struct pernet_operations rtnetlink_net_ops = {
2755 .init = rtnetlink_net_init,
2756 .exit = rtnetlink_net_exit,
2757 };
2758
2759 void __init rtnetlink_init(void)
2760 {
2761 if (register_pernet_subsys(&rtnetlink_net_ops))
2762 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2763
2764 register_netdevice_notifier(&rtnetlink_dev_notifier);
2765
2766 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2767 rtnl_dump_ifinfo, rtnl_calcit);
2768 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2769 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2770 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2771
2772 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2773 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2774
2775 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
2776 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
2777 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
2778
2779 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
2780 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
2781 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
2782 }
2783
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