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rtnetlink: call ->dellink on failure when ->newlink exists
[GitHub/LineageOS/android_kernel_samsung_universal7580.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 u32 ext_filter_mask)
719 {
720 size_t port_size = nla_total_size(4) /* PORT_VF */
721 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
722 + nla_total_size(sizeof(struct ifla_port_vsi))
723 /* PORT_VSI_TYPE */
724 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
725 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
726 + nla_total_size(1) /* PROT_VDP_REQUEST */
727 + nla_total_size(2); /* PORT_VDP_RESPONSE */
728 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
729 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
730 + port_size;
731 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
732 + port_size;
733
734 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
735 !(ext_filter_mask & RTEXT_FILTER_VF))
736 return 0;
737 if (dev_num_vf(dev->dev.parent))
738 return port_self_size + vf_ports_size +
739 vf_port_size * dev_num_vf(dev->dev.parent);
740 else
741 return port_self_size;
742 }
743
744 static noinline size_t if_nlmsg_size(const struct net_device *dev,
745 u32 ext_filter_mask)
746 {
747 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
748 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
749 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
750 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
751 + nla_total_size(sizeof(struct rtnl_link_ifmap))
752 + nla_total_size(sizeof(struct rtnl_link_stats))
753 + nla_total_size(sizeof(struct rtnl_link_stats64))
754 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
755 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
756 + nla_total_size(4) /* IFLA_TXQLEN */
757 + nla_total_size(4) /* IFLA_WEIGHT */
758 + nla_total_size(4) /* IFLA_MTU */
759 + nla_total_size(4) /* IFLA_LINK */
760 + nla_total_size(4) /* IFLA_MASTER */
761 + nla_total_size(1) /* IFLA_CARRIER */
762 + nla_total_size(4) /* IFLA_PROMISCUITY */
763 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
764 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
765 + nla_total_size(1) /* IFLA_OPERSTATE */
766 + nla_total_size(1) /* IFLA_LINKMODE */
767 + nla_total_size(ext_filter_mask
768 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
769 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
770 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
771 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
772 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
773 }
774
775 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
776 {
777 struct nlattr *vf_ports;
778 struct nlattr *vf_port;
779 int vf;
780 int err;
781
782 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
783 if (!vf_ports)
784 return -EMSGSIZE;
785
786 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
787 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
788 if (!vf_port)
789 goto nla_put_failure;
790 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
791 goto nla_put_failure;
792 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
793 if (err == -EMSGSIZE)
794 goto nla_put_failure;
795 if (err) {
796 nla_nest_cancel(skb, vf_port);
797 continue;
798 }
799 nla_nest_end(skb, vf_port);
800 }
801
802 nla_nest_end(skb, vf_ports);
803
804 return 0;
805
806 nla_put_failure:
807 nla_nest_cancel(skb, vf_ports);
808 return -EMSGSIZE;
809 }
810
811 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
812 {
813 struct nlattr *port_self;
814 int err;
815
816 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
817 if (!port_self)
818 return -EMSGSIZE;
819
820 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
821 if (err) {
822 nla_nest_cancel(skb, port_self);
823 return (err == -EMSGSIZE) ? err : 0;
824 }
825
826 nla_nest_end(skb, port_self);
827
828 return 0;
829 }
830
831 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
832 u32 ext_filter_mask)
833 {
834 int err;
835
836 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
837 !(ext_filter_mask & RTEXT_FILTER_VF))
838 return 0;
839
840 err = rtnl_port_self_fill(skb, dev);
841 if (err)
842 return err;
843
844 if (dev_num_vf(dev->dev.parent)) {
845 err = rtnl_vf_ports_fill(skb, dev);
846 if (err)
847 return err;
848 }
849
850 return 0;
851 }
852
853 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
854 int type, u32 pid, u32 seq, u32 change,
855 unsigned int flags, u32 ext_filter_mask)
856 {
857 struct ifinfomsg *ifm;
858 struct nlmsghdr *nlh;
859 struct rtnl_link_stats64 temp;
860 const struct rtnl_link_stats64 *stats;
861 struct nlattr *attr, *af_spec;
862 struct rtnl_af_ops *af_ops;
863 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
864
865 ASSERT_RTNL();
866 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
867 if (nlh == NULL)
868 return -EMSGSIZE;
869
870 ifm = nlmsg_data(nlh);
871 ifm->ifi_family = AF_UNSPEC;
872 ifm->__ifi_pad = 0;
873 ifm->ifi_type = dev->type;
874 ifm->ifi_index = dev->ifindex;
875 ifm->ifi_flags = dev_get_flags(dev);
876 ifm->ifi_change = change;
877
878 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
879 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
880 nla_put_u8(skb, IFLA_OPERSTATE,
881 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
882 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
883 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
884 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
885 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
886 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
887 #ifdef CONFIG_RPS
888 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
889 #endif
890 (dev->ifindex != dev->iflink &&
891 nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
892 (upper_dev &&
893 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
894 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
895 (dev->qdisc &&
896 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
897 (dev->ifalias &&
898 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)))
899 goto nla_put_failure;
900
901 if (1) {
902 struct rtnl_link_ifmap map = {
903 .mem_start = dev->mem_start,
904 .mem_end = dev->mem_end,
905 .base_addr = dev->base_addr,
906 .irq = dev->irq,
907 .dma = dev->dma,
908 .port = dev->if_port,
909 };
910 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
911 goto nla_put_failure;
912 }
913
914 if (dev->addr_len) {
915 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
916 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
917 goto nla_put_failure;
918 }
919
920 attr = nla_reserve(skb, IFLA_STATS,
921 sizeof(struct rtnl_link_stats));
922 if (attr == NULL)
923 goto nla_put_failure;
924
925 stats = dev_get_stats(dev, &temp);
926 copy_rtnl_link_stats(nla_data(attr), stats);
927
928 attr = nla_reserve(skb, IFLA_STATS64,
929 sizeof(struct rtnl_link_stats64));
930 if (attr == NULL)
931 goto nla_put_failure;
932 copy_rtnl_link_stats64(nla_data(attr), stats);
933
934 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
935 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
936 goto nla_put_failure;
937
938 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
939 && (ext_filter_mask & RTEXT_FILTER_VF)) {
940 int i;
941
942 struct nlattr *vfinfo, *vf;
943 int num_vfs = dev_num_vf(dev->dev.parent);
944
945 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
946 if (!vfinfo)
947 goto nla_put_failure;
948 for (i = 0; i < num_vfs; i++) {
949 struct ifla_vf_info ivi;
950 struct ifla_vf_mac vf_mac;
951 struct ifla_vf_vlan vf_vlan;
952 struct ifla_vf_tx_rate vf_tx_rate;
953 struct ifla_vf_spoofchk vf_spoofchk;
954
955 /*
956 * Not all SR-IOV capable drivers support the
957 * spoofcheck query. Preset to -1 so the user
958 * space tool can detect that the driver didn't
959 * report anything.
960 */
961 ivi.spoofchk = -1;
962 memset(ivi.mac, 0, sizeof(ivi.mac));
963 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
964 break;
965 vf_mac.vf =
966 vf_vlan.vf =
967 vf_tx_rate.vf =
968 vf_spoofchk.vf = ivi.vf;
969
970 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
971 vf_vlan.vlan = ivi.vlan;
972 vf_vlan.qos = ivi.qos;
973 vf_tx_rate.rate = ivi.tx_rate;
974 vf_spoofchk.setting = ivi.spoofchk;
975 vf = nla_nest_start(skb, IFLA_VF_INFO);
976 if (!vf) {
977 nla_nest_cancel(skb, vfinfo);
978 goto nla_put_failure;
979 }
980 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
981 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
982 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
983 &vf_tx_rate) ||
984 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
985 &vf_spoofchk))
986 goto nla_put_failure;
987 nla_nest_end(skb, vf);
988 }
989 nla_nest_end(skb, vfinfo);
990 }
991
992 if (rtnl_port_fill(skb, dev, ext_filter_mask))
993 goto nla_put_failure;
994
995 if (dev->rtnl_link_ops) {
996 if (rtnl_link_fill(skb, dev) < 0)
997 goto nla_put_failure;
998 }
999
1000 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1001 goto nla_put_failure;
1002
1003 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1004 if (af_ops->fill_link_af) {
1005 struct nlattr *af;
1006 int err;
1007
1008 if (!(af = nla_nest_start(skb, af_ops->family)))
1009 goto nla_put_failure;
1010
1011 err = af_ops->fill_link_af(skb, dev);
1012
1013 /*
1014 * Caller may return ENODATA to indicate that there
1015 * was no data to be dumped. This is not an error, it
1016 * means we should trim the attribute header and
1017 * continue.
1018 */
1019 if (err == -ENODATA)
1020 nla_nest_cancel(skb, af);
1021 else if (err < 0)
1022 goto nla_put_failure;
1023
1024 nla_nest_end(skb, af);
1025 }
1026 }
1027
1028 nla_nest_end(skb, af_spec);
1029
1030 return nlmsg_end(skb, nlh);
1031
1032 nla_put_failure:
1033 nlmsg_cancel(skb, nlh);
1034 return -EMSGSIZE;
1035 }
1036
1037 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1038 {
1039 struct net *net = sock_net(skb->sk);
1040 int h, s_h;
1041 int idx = 0, s_idx;
1042 struct net_device *dev;
1043 struct hlist_head *head;
1044 struct nlattr *tb[IFLA_MAX+1];
1045 u32 ext_filter_mask = 0;
1046 int err;
1047 int hdrlen;
1048
1049 s_h = cb->args[0];
1050 s_idx = cb->args[1];
1051
1052 rcu_read_lock();
1053 cb->seq = net->dev_base_seq;
1054
1055 /* A hack to preserve kernel<->userspace interface.
1056 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1057 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1058 * what iproute2 < v3.9.0 used.
1059 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1060 * attribute, its netlink message is shorter than struct ifinfomsg.
1061 */
1062 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1063 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1064
1065 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1066
1067 if (tb[IFLA_EXT_MASK])
1068 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1069 }
1070
1071 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1072 idx = 0;
1073 head = &net->dev_index_head[h];
1074 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1075 if (idx < s_idx)
1076 goto cont;
1077 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1078 NETLINK_CB(cb->skb).portid,
1079 cb->nlh->nlmsg_seq, 0,
1080 NLM_F_MULTI,
1081 ext_filter_mask);
1082 /* If we ran out of room on the first message,
1083 * we're in trouble
1084 */
1085 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1086
1087 if (err <= 0)
1088 goto out;
1089
1090 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1091 cont:
1092 idx++;
1093 }
1094 }
1095 out:
1096 rcu_read_unlock();
1097 cb->args[1] = idx;
1098 cb->args[0] = h;
1099
1100 return skb->len;
1101 }
1102
1103 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1104 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1105 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1106 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1107 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1108 [IFLA_MTU] = { .type = NLA_U32 },
1109 [IFLA_LINK] = { .type = NLA_U32 },
1110 [IFLA_MASTER] = { .type = NLA_U32 },
1111 [IFLA_CARRIER] = { .type = NLA_U8 },
1112 [IFLA_TXQLEN] = { .type = NLA_U32 },
1113 [IFLA_WEIGHT] = { .type = NLA_U32 },
1114 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1115 [IFLA_LINKMODE] = { .type = NLA_U8 },
1116 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1117 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1118 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1119 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1120 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1121 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1122 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1123 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1124 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1125 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1126 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1127 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1128 };
1129 EXPORT_SYMBOL(ifla_policy);
1130
1131 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1132 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1133 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1134 };
1135
1136 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1137 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1138 };
1139
1140 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1141 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
1142 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
1143 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
1144 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
1145 };
1146
1147 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1148 [IFLA_PORT_VF] = { .type = NLA_U32 },
1149 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1150 .len = PORT_PROFILE_MAX },
1151 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1152 .len = sizeof(struct ifla_port_vsi)},
1153 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1154 .len = PORT_UUID_MAX },
1155 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1156 .len = PORT_UUID_MAX },
1157 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1158 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1159 };
1160
1161 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1162 {
1163 struct net *net;
1164 /* Examine the link attributes and figure out which
1165 * network namespace we are talking about.
1166 */
1167 if (tb[IFLA_NET_NS_PID])
1168 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1169 else if (tb[IFLA_NET_NS_FD])
1170 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1171 else
1172 net = get_net(src_net);
1173 return net;
1174 }
1175 EXPORT_SYMBOL(rtnl_link_get_net);
1176
1177 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1178 {
1179 if (dev) {
1180 if (tb[IFLA_ADDRESS] &&
1181 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1182 return -EINVAL;
1183
1184 if (tb[IFLA_BROADCAST] &&
1185 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1186 return -EINVAL;
1187 }
1188
1189 if (tb[IFLA_AF_SPEC]) {
1190 struct nlattr *af;
1191 int rem, err;
1192
1193 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1194 const struct rtnl_af_ops *af_ops;
1195
1196 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1197 return -EAFNOSUPPORT;
1198
1199 if (!af_ops->set_link_af)
1200 return -EOPNOTSUPP;
1201
1202 if (af_ops->validate_link_af) {
1203 err = af_ops->validate_link_af(dev, af);
1204 if (err < 0)
1205 return err;
1206 }
1207 }
1208 }
1209
1210 return 0;
1211 }
1212
1213 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1214 {
1215 int rem, err = -EINVAL;
1216 struct nlattr *vf;
1217 const struct net_device_ops *ops = dev->netdev_ops;
1218
1219 nla_for_each_nested(vf, attr, rem) {
1220 switch (nla_type(vf)) {
1221 case IFLA_VF_MAC: {
1222 struct ifla_vf_mac *ivm;
1223 ivm = nla_data(vf);
1224 err = -EOPNOTSUPP;
1225 if (ops->ndo_set_vf_mac)
1226 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1227 ivm->mac);
1228 break;
1229 }
1230 case IFLA_VF_VLAN: {
1231 struct ifla_vf_vlan *ivv;
1232 ivv = nla_data(vf);
1233 err = -EOPNOTSUPP;
1234 if (ops->ndo_set_vf_vlan)
1235 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1236 ivv->vlan,
1237 ivv->qos);
1238 break;
1239 }
1240 case IFLA_VF_TX_RATE: {
1241 struct ifla_vf_tx_rate *ivt;
1242 ivt = nla_data(vf);
1243 err = -EOPNOTSUPP;
1244 if (ops->ndo_set_vf_tx_rate)
1245 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1246 ivt->rate);
1247 break;
1248 }
1249 case IFLA_VF_SPOOFCHK: {
1250 struct ifla_vf_spoofchk *ivs;
1251 ivs = nla_data(vf);
1252 err = -EOPNOTSUPP;
1253 if (ops->ndo_set_vf_spoofchk)
1254 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1255 ivs->setting);
1256 break;
1257 }
1258 default:
1259 err = -EINVAL;
1260 break;
1261 }
1262 if (err)
1263 break;
1264 }
1265 return err;
1266 }
1267
1268 static int do_set_master(struct net_device *dev, int ifindex)
1269 {
1270 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1271 const struct net_device_ops *ops;
1272 int err;
1273
1274 if (upper_dev) {
1275 if (upper_dev->ifindex == ifindex)
1276 return 0;
1277 ops = upper_dev->netdev_ops;
1278 if (ops->ndo_del_slave) {
1279 err = ops->ndo_del_slave(upper_dev, dev);
1280 if (err)
1281 return err;
1282 } else {
1283 return -EOPNOTSUPP;
1284 }
1285 }
1286
1287 if (ifindex) {
1288 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1289 if (!upper_dev)
1290 return -EINVAL;
1291 ops = upper_dev->netdev_ops;
1292 if (ops->ndo_add_slave) {
1293 err = ops->ndo_add_slave(upper_dev, dev);
1294 if (err)
1295 return err;
1296 } else {
1297 return -EOPNOTSUPP;
1298 }
1299 }
1300 return 0;
1301 }
1302
1303 static int do_setlink(const struct sk_buff *skb,
1304 struct net_device *dev, struct ifinfomsg *ifm,
1305 struct nlattr **tb, char *ifname, int modified)
1306 {
1307 const struct net_device_ops *ops = dev->netdev_ops;
1308 int err;
1309
1310 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1311 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1312 if (IS_ERR(net)) {
1313 err = PTR_ERR(net);
1314 goto errout;
1315 }
1316 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1317 err = -EPERM;
1318 goto errout;
1319 }
1320 err = dev_change_net_namespace(dev, net, ifname);
1321 put_net(net);
1322 if (err)
1323 goto errout;
1324 modified = 1;
1325 }
1326
1327 if (tb[IFLA_MAP]) {
1328 struct rtnl_link_ifmap *u_map;
1329 struct ifmap k_map;
1330
1331 if (!ops->ndo_set_config) {
1332 err = -EOPNOTSUPP;
1333 goto errout;
1334 }
1335
1336 if (!netif_device_present(dev)) {
1337 err = -ENODEV;
1338 goto errout;
1339 }
1340
1341 u_map = nla_data(tb[IFLA_MAP]);
1342 k_map.mem_start = (unsigned long) u_map->mem_start;
1343 k_map.mem_end = (unsigned long) u_map->mem_end;
1344 k_map.base_addr = (unsigned short) u_map->base_addr;
1345 k_map.irq = (unsigned char) u_map->irq;
1346 k_map.dma = (unsigned char) u_map->dma;
1347 k_map.port = (unsigned char) u_map->port;
1348
1349 err = ops->ndo_set_config(dev, &k_map);
1350 if (err < 0)
1351 goto errout;
1352
1353 modified = 1;
1354 }
1355
1356 if (tb[IFLA_ADDRESS]) {
1357 struct sockaddr *sa;
1358 int len;
1359
1360 len = sizeof(sa_family_t) + dev->addr_len;
1361 sa = kmalloc(len, GFP_KERNEL);
1362 if (!sa) {
1363 err = -ENOMEM;
1364 goto errout;
1365 }
1366 sa->sa_family = dev->type;
1367 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1368 dev->addr_len);
1369 err = dev_set_mac_address(dev, sa);
1370 kfree(sa);
1371 if (err)
1372 goto errout;
1373 modified = 1;
1374 }
1375
1376 if (tb[IFLA_MTU]) {
1377 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1378 if (err < 0)
1379 goto errout;
1380 modified = 1;
1381 }
1382
1383 if (tb[IFLA_GROUP]) {
1384 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1385 modified = 1;
1386 }
1387
1388 /*
1389 * Interface selected by interface index but interface
1390 * name provided implies that a name change has been
1391 * requested.
1392 */
1393 if (ifm->ifi_index > 0 && ifname[0]) {
1394 err = dev_change_name(dev, ifname);
1395 if (err < 0)
1396 goto errout;
1397 modified = 1;
1398 }
1399
1400 if (tb[IFLA_IFALIAS]) {
1401 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1402 nla_len(tb[IFLA_IFALIAS]));
1403 if (err < 0)
1404 goto errout;
1405 modified = 1;
1406 }
1407
1408 if (tb[IFLA_BROADCAST]) {
1409 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1410 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1411 }
1412
1413 if (ifm->ifi_flags || ifm->ifi_change) {
1414 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1415 if (err < 0)
1416 goto errout;
1417 }
1418
1419 if (tb[IFLA_MASTER]) {
1420 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1421 if (err)
1422 goto errout;
1423 modified = 1;
1424 }
1425
1426 if (tb[IFLA_CARRIER]) {
1427 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1428 if (err)
1429 goto errout;
1430 modified = 1;
1431 }
1432
1433 if (tb[IFLA_TXQLEN])
1434 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1435
1436 if (tb[IFLA_OPERSTATE])
1437 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1438
1439 if (tb[IFLA_LINKMODE]) {
1440 write_lock_bh(&dev_base_lock);
1441 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1442 write_unlock_bh(&dev_base_lock);
1443 }
1444
1445 if (tb[IFLA_VFINFO_LIST]) {
1446 struct nlattr *attr;
1447 int rem;
1448 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1449 if (nla_type(attr) != IFLA_VF_INFO) {
1450 err = -EINVAL;
1451 goto errout;
1452 }
1453 err = do_setvfinfo(dev, attr);
1454 if (err < 0)
1455 goto errout;
1456 modified = 1;
1457 }
1458 }
1459 err = 0;
1460
1461 if (tb[IFLA_VF_PORTS]) {
1462 struct nlattr *port[IFLA_PORT_MAX+1];
1463 struct nlattr *attr;
1464 int vf;
1465 int rem;
1466
1467 err = -EOPNOTSUPP;
1468 if (!ops->ndo_set_vf_port)
1469 goto errout;
1470
1471 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1472 if (nla_type(attr) != IFLA_VF_PORT)
1473 continue;
1474 err = nla_parse_nested(port, IFLA_PORT_MAX,
1475 attr, ifla_port_policy);
1476 if (err < 0)
1477 goto errout;
1478 if (!port[IFLA_PORT_VF]) {
1479 err = -EOPNOTSUPP;
1480 goto errout;
1481 }
1482 vf = nla_get_u32(port[IFLA_PORT_VF]);
1483 err = ops->ndo_set_vf_port(dev, vf, port);
1484 if (err < 0)
1485 goto errout;
1486 modified = 1;
1487 }
1488 }
1489 err = 0;
1490
1491 if (tb[IFLA_PORT_SELF]) {
1492 struct nlattr *port[IFLA_PORT_MAX+1];
1493
1494 err = nla_parse_nested(port, IFLA_PORT_MAX,
1495 tb[IFLA_PORT_SELF], ifla_port_policy);
1496 if (err < 0)
1497 goto errout;
1498
1499 err = -EOPNOTSUPP;
1500 if (ops->ndo_set_vf_port)
1501 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1502 if (err < 0)
1503 goto errout;
1504 modified = 1;
1505 }
1506
1507 if (tb[IFLA_AF_SPEC]) {
1508 struct nlattr *af;
1509 int rem;
1510
1511 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1512 const struct rtnl_af_ops *af_ops;
1513
1514 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1515 BUG();
1516
1517 err = af_ops->set_link_af(dev, af);
1518 if (err < 0)
1519 goto errout;
1520
1521 modified = 1;
1522 }
1523 }
1524 err = 0;
1525
1526 errout:
1527 if (err < 0 && modified)
1528 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",
1529 dev->name);
1530
1531 return err;
1532 }
1533
1534 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1535 {
1536 struct net *net = sock_net(skb->sk);
1537 struct ifinfomsg *ifm;
1538 struct net_device *dev;
1539 int err;
1540 struct nlattr *tb[IFLA_MAX+1];
1541 char ifname[IFNAMSIZ];
1542
1543 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1544 if (err < 0)
1545 goto errout;
1546
1547 if (tb[IFLA_IFNAME])
1548 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1549 else
1550 ifname[0] = '\0';
1551
1552 err = -EINVAL;
1553 ifm = nlmsg_data(nlh);
1554 if (ifm->ifi_index > 0)
1555 dev = __dev_get_by_index(net, ifm->ifi_index);
1556 else if (tb[IFLA_IFNAME])
1557 dev = __dev_get_by_name(net, ifname);
1558 else
1559 goto errout;
1560
1561 if (dev == NULL) {
1562 err = -ENODEV;
1563 goto errout;
1564 }
1565
1566 err = validate_linkmsg(dev, tb);
1567 if (err < 0)
1568 goto errout;
1569
1570 err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1571 errout:
1572 return err;
1573 }
1574
1575 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1576 {
1577 struct net *net = sock_net(skb->sk);
1578 const struct rtnl_link_ops *ops;
1579 struct net_device *dev;
1580 struct ifinfomsg *ifm;
1581 char ifname[IFNAMSIZ];
1582 struct nlattr *tb[IFLA_MAX+1];
1583 int err;
1584 LIST_HEAD(list_kill);
1585
1586 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1587 if (err < 0)
1588 return err;
1589
1590 if (tb[IFLA_IFNAME])
1591 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1592
1593 ifm = nlmsg_data(nlh);
1594 if (ifm->ifi_index > 0)
1595 dev = __dev_get_by_index(net, ifm->ifi_index);
1596 else if (tb[IFLA_IFNAME])
1597 dev = __dev_get_by_name(net, ifname);
1598 else
1599 return -EINVAL;
1600
1601 if (!dev)
1602 return -ENODEV;
1603
1604 ops = dev->rtnl_link_ops;
1605 if (!ops)
1606 return -EOPNOTSUPP;
1607
1608 ops->dellink(dev, &list_kill);
1609 unregister_netdevice_many(&list_kill);
1610 return 0;
1611 }
1612
1613 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1614 {
1615 unsigned int old_flags;
1616 int err;
1617
1618 old_flags = dev->flags;
1619 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1620 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1621 if (err < 0)
1622 return err;
1623 }
1624
1625 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1626 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1627
1628 __dev_notify_flags(dev, old_flags);
1629 return 0;
1630 }
1631 EXPORT_SYMBOL(rtnl_configure_link);
1632
1633 struct net_device *rtnl_create_link(struct net *net,
1634 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1635 {
1636 int err;
1637 struct net_device *dev;
1638 unsigned int num_tx_queues = 1;
1639 unsigned int num_rx_queues = 1;
1640
1641 if (tb[IFLA_NUM_TX_QUEUES])
1642 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1643 else if (ops->get_num_tx_queues)
1644 num_tx_queues = ops->get_num_tx_queues();
1645
1646 if (tb[IFLA_NUM_RX_QUEUES])
1647 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1648 else if (ops->get_num_rx_queues)
1649 num_rx_queues = ops->get_num_rx_queues();
1650
1651 err = -ENOMEM;
1652 dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup,
1653 num_tx_queues, num_rx_queues);
1654 if (!dev)
1655 goto err;
1656
1657 dev_net_set(dev, net);
1658 dev->rtnl_link_ops = ops;
1659 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1660
1661 if (tb[IFLA_MTU])
1662 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1663 if (tb[IFLA_ADDRESS]) {
1664 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1665 nla_len(tb[IFLA_ADDRESS]));
1666 dev->addr_assign_type = NET_ADDR_SET;
1667 }
1668 if (tb[IFLA_BROADCAST])
1669 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1670 nla_len(tb[IFLA_BROADCAST]));
1671 if (tb[IFLA_TXQLEN])
1672 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1673 if (tb[IFLA_OPERSTATE])
1674 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1675 if (tb[IFLA_LINKMODE])
1676 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1677 if (tb[IFLA_GROUP])
1678 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1679
1680 return dev;
1681
1682 err:
1683 return ERR_PTR(err);
1684 }
1685 EXPORT_SYMBOL(rtnl_create_link);
1686
1687 static int rtnl_group_changelink(const struct sk_buff *skb,
1688 struct net *net, int group,
1689 struct ifinfomsg *ifm,
1690 struct nlattr **tb)
1691 {
1692 struct net_device *dev;
1693 int err;
1694
1695 for_each_netdev(net, dev) {
1696 if (dev->group == group) {
1697 err = do_setlink(skb, dev, ifm, tb, NULL, 0);
1698 if (err < 0)
1699 return err;
1700 }
1701 }
1702
1703 return 0;
1704 }
1705
1706 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1707 {
1708 struct net *net = sock_net(skb->sk);
1709 const struct rtnl_link_ops *ops;
1710 struct net_device *dev;
1711 struct ifinfomsg *ifm;
1712 char kind[MODULE_NAME_LEN];
1713 char ifname[IFNAMSIZ];
1714 struct nlattr *tb[IFLA_MAX+1];
1715 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1716 int err;
1717
1718 #ifdef CONFIG_MODULES
1719 replay:
1720 #endif
1721 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1722 if (err < 0)
1723 return err;
1724
1725 if (tb[IFLA_IFNAME])
1726 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1727 else
1728 ifname[0] = '\0';
1729
1730 ifm = nlmsg_data(nlh);
1731 if (ifm->ifi_index > 0)
1732 dev = __dev_get_by_index(net, ifm->ifi_index);
1733 else {
1734 if (ifname[0])
1735 dev = __dev_get_by_name(net, ifname);
1736 else
1737 dev = NULL;
1738 }
1739
1740 err = validate_linkmsg(dev, tb);
1741 if (err < 0)
1742 return err;
1743
1744 if (tb[IFLA_LINKINFO]) {
1745 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1746 tb[IFLA_LINKINFO], ifla_info_policy);
1747 if (err < 0)
1748 return err;
1749 } else
1750 memset(linkinfo, 0, sizeof(linkinfo));
1751
1752 if (linkinfo[IFLA_INFO_KIND]) {
1753 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1754 ops = rtnl_link_ops_get(kind);
1755 } else {
1756 kind[0] = '\0';
1757 ops = NULL;
1758 }
1759
1760 if (1) {
1761 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1762 struct net *dest_net;
1763
1764 if (ops) {
1765 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1766 err = nla_parse_nested(attr, ops->maxtype,
1767 linkinfo[IFLA_INFO_DATA],
1768 ops->policy);
1769 if (err < 0)
1770 return err;
1771 data = attr;
1772 }
1773 if (ops->validate) {
1774 err = ops->validate(tb, data);
1775 if (err < 0)
1776 return err;
1777 }
1778 }
1779
1780 if (dev) {
1781 int modified = 0;
1782
1783 if (nlh->nlmsg_flags & NLM_F_EXCL)
1784 return -EEXIST;
1785 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1786 return -EOPNOTSUPP;
1787
1788 if (linkinfo[IFLA_INFO_DATA]) {
1789 if (!ops || ops != dev->rtnl_link_ops ||
1790 !ops->changelink)
1791 return -EOPNOTSUPP;
1792
1793 err = ops->changelink(dev, tb, data);
1794 if (err < 0)
1795 return err;
1796 modified = 1;
1797 }
1798
1799 return do_setlink(skb, dev, ifm, tb, ifname, modified);
1800 }
1801
1802 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1803 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1804 return rtnl_group_changelink(skb, net,
1805 nla_get_u32(tb[IFLA_GROUP]),
1806 ifm, tb);
1807 return -ENODEV;
1808 }
1809
1810 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1811 return -EOPNOTSUPP;
1812
1813 if (!ops) {
1814 #ifdef CONFIG_MODULES
1815 if (kind[0]) {
1816 __rtnl_unlock();
1817 request_module("rtnl-link-%s", kind);
1818 rtnl_lock();
1819 ops = rtnl_link_ops_get(kind);
1820 if (ops)
1821 goto replay;
1822 }
1823 #endif
1824 return -EOPNOTSUPP;
1825 }
1826
1827 if (!ifname[0])
1828 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1829
1830 dest_net = rtnl_link_get_net(net, tb);
1831 if (IS_ERR(dest_net))
1832 return PTR_ERR(dest_net);
1833
1834 dev = rtnl_create_link(dest_net, ifname, ops, tb);
1835 if (IS_ERR(dev)) {
1836 err = PTR_ERR(dev);
1837 goto out;
1838 }
1839
1840 dev->ifindex = ifm->ifi_index;
1841
1842 if (ops->newlink)
1843 err = ops->newlink(net, dev, tb, data);
1844 else
1845 err = register_netdevice(dev);
1846
1847 if (err < 0 && !IS_ERR(dev))
1848 free_netdev(dev);
1849 if (err < 0)
1850 goto out;
1851
1852 err = rtnl_configure_link(dev, ifm);
1853 if (err < 0) {
1854 if (ops->newlink) {
1855 LIST_HEAD(list_kill);
1856
1857 ops->dellink(dev, &list_kill);
1858 unregister_netdevice_many(&list_kill);
1859 } else {
1860 unregister_netdevice(dev);
1861 }
1862 }
1863 out:
1864 put_net(dest_net);
1865 return err;
1866 }
1867 }
1868
1869 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
1870 {
1871 struct net *net = sock_net(skb->sk);
1872 struct ifinfomsg *ifm;
1873 char ifname[IFNAMSIZ];
1874 struct nlattr *tb[IFLA_MAX+1];
1875 struct net_device *dev = NULL;
1876 struct sk_buff *nskb;
1877 int err;
1878 u32 ext_filter_mask = 0;
1879
1880 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1881 if (err < 0)
1882 return err;
1883
1884 if (tb[IFLA_IFNAME])
1885 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1886
1887 if (tb[IFLA_EXT_MASK])
1888 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1889
1890 ifm = nlmsg_data(nlh);
1891 if (ifm->ifi_index > 0)
1892 dev = __dev_get_by_index(net, ifm->ifi_index);
1893 else if (tb[IFLA_IFNAME])
1894 dev = __dev_get_by_name(net, ifname);
1895 else
1896 return -EINVAL;
1897
1898 if (dev == NULL)
1899 return -ENODEV;
1900
1901 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1902 if (nskb == NULL)
1903 return -ENOBUFS;
1904
1905 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
1906 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1907 if (err < 0) {
1908 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1909 WARN_ON(err == -EMSGSIZE);
1910 kfree_skb(nskb);
1911 } else
1912 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
1913
1914 return err;
1915 }
1916
1917 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1918 {
1919 struct net *net = sock_net(skb->sk);
1920 struct net_device *dev;
1921 struct nlattr *tb[IFLA_MAX+1];
1922 u32 ext_filter_mask = 0;
1923 u16 min_ifinfo_dump_size = 0;
1924 int hdrlen;
1925
1926 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
1927 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
1928 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1929
1930 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1931 if (tb[IFLA_EXT_MASK])
1932 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1933 }
1934
1935 if (!ext_filter_mask)
1936 return NLMSG_GOODSIZE;
1937 /*
1938 * traverse the list of net devices and compute the minimum
1939 * buffer size based upon the filter mask.
1940 */
1941 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1942 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1943 if_nlmsg_size(dev,
1944 ext_filter_mask));
1945 }
1946
1947 return min_ifinfo_dump_size;
1948 }
1949
1950 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1951 {
1952 int idx;
1953 int s_idx = cb->family;
1954
1955 if (s_idx == 0)
1956 s_idx = 1;
1957 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1958 int type = cb->nlh->nlmsg_type-RTM_BASE;
1959 if (idx < s_idx || idx == PF_PACKET)
1960 continue;
1961 if (rtnl_msg_handlers[idx] == NULL ||
1962 rtnl_msg_handlers[idx][type].dumpit == NULL)
1963 continue;
1964 if (idx > s_idx) {
1965 memset(&cb->args[0], 0, sizeof(cb->args));
1966 cb->prev_seq = 0;
1967 cb->seq = 0;
1968 }
1969 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1970 break;
1971 }
1972 cb->family = idx;
1973
1974 return skb->len;
1975 }
1976
1977 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change)
1978 {
1979 struct net *net = dev_net(dev);
1980 struct sk_buff *skb;
1981 int err = -ENOBUFS;
1982 size_t if_info_size;
1983
1984 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1985 if (skb == NULL)
1986 goto errout;
1987
1988 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
1989 if (err < 0) {
1990 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1991 WARN_ON(err == -EMSGSIZE);
1992 kfree_skb(skb);
1993 goto errout;
1994 }
1995 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1996 return;
1997 errout:
1998 if (err < 0)
1999 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2000 }
2001 EXPORT_SYMBOL(rtmsg_ifinfo);
2002
2003 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2004 struct net_device *dev,
2005 u8 *addr, u32 pid, u32 seq,
2006 int type, unsigned int flags,
2007 int nlflags)
2008 {
2009 struct nlmsghdr *nlh;
2010 struct ndmsg *ndm;
2011
2012 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2013 if (!nlh)
2014 return -EMSGSIZE;
2015
2016 ndm = nlmsg_data(nlh);
2017 ndm->ndm_family = AF_BRIDGE;
2018 ndm->ndm_pad1 = 0;
2019 ndm->ndm_pad2 = 0;
2020 ndm->ndm_flags = flags;
2021 ndm->ndm_type = 0;
2022 ndm->ndm_ifindex = dev->ifindex;
2023 ndm->ndm_state = NUD_PERMANENT;
2024
2025 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2026 goto nla_put_failure;
2027
2028 return nlmsg_end(skb, nlh);
2029
2030 nla_put_failure:
2031 nlmsg_cancel(skb, nlh);
2032 return -EMSGSIZE;
2033 }
2034
2035 static inline size_t rtnl_fdb_nlmsg_size(void)
2036 {
2037 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2038 }
2039
2040 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2041 {
2042 struct net *net = dev_net(dev);
2043 struct sk_buff *skb;
2044 int err = -ENOBUFS;
2045
2046 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2047 if (!skb)
2048 goto errout;
2049
2050 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0);
2051 if (err < 0) {
2052 kfree_skb(skb);
2053 goto errout;
2054 }
2055
2056 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2057 return;
2058 errout:
2059 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2060 }
2061
2062 /**
2063 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2064 */
2065 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2066 struct nlattr *tb[],
2067 struct net_device *dev,
2068 const unsigned char *addr,
2069 u16 flags)
2070 {
2071 int err = -EINVAL;
2072
2073 /* If aging addresses are supported device will need to
2074 * implement its own handler for this.
2075 */
2076 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2077 pr_info("%s: FDB only supports static addresses\n", dev->name);
2078 return err;
2079 }
2080
2081 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2082 err = dev_uc_add_excl(dev, addr);
2083 else if (is_multicast_ether_addr(addr))
2084 err = dev_mc_add_excl(dev, addr);
2085
2086 /* Only return duplicate errors if NLM_F_EXCL is set */
2087 if (err == -EEXIST && !(flags & NLM_F_EXCL))
2088 err = 0;
2089
2090 return err;
2091 }
2092 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2093
2094 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2095 {
2096 struct net *net = sock_net(skb->sk);
2097 struct ndmsg *ndm;
2098 struct nlattr *tb[NDA_MAX+1];
2099 struct net_device *dev;
2100 u8 *addr;
2101 int err;
2102
2103 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2104 if (err < 0)
2105 return err;
2106
2107 ndm = nlmsg_data(nlh);
2108 if (ndm->ndm_ifindex == 0) {
2109 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2110 return -EINVAL;
2111 }
2112
2113 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2114 if (dev == NULL) {
2115 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2116 return -ENODEV;
2117 }
2118
2119 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2120 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2121 return -EINVAL;
2122 }
2123
2124 addr = nla_data(tb[NDA_LLADDR]);
2125 if (is_zero_ether_addr(addr)) {
2126 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ether address\n");
2127 return -EINVAL;
2128 }
2129
2130 err = -EOPNOTSUPP;
2131
2132 /* Support fdb on master device the net/bridge default case */
2133 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2134 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2135 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2136 const struct net_device_ops *ops = br_dev->netdev_ops;
2137
2138 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2139 if (err)
2140 goto out;
2141 else
2142 ndm->ndm_flags &= ~NTF_MASTER;
2143 }
2144
2145 /* Embedded bridge, macvlan, and any other device support */
2146 if ((ndm->ndm_flags & NTF_SELF)) {
2147 if (dev->netdev_ops->ndo_fdb_add)
2148 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2149 nlh->nlmsg_flags);
2150 else
2151 err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2152 nlh->nlmsg_flags);
2153
2154 if (!err) {
2155 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2156 ndm->ndm_flags &= ~NTF_SELF;
2157 }
2158 }
2159 out:
2160 return err;
2161 }
2162
2163 /**
2164 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2165 */
2166 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2167 struct nlattr *tb[],
2168 struct net_device *dev,
2169 const unsigned char *addr)
2170 {
2171 int err = -EOPNOTSUPP;
2172
2173 /* If aging addresses are supported device will need to
2174 * implement its own handler for this.
2175 */
2176 if (!(ndm->ndm_state & NUD_PERMANENT)) {
2177 pr_info("%s: FDB only supports static addresses\n", dev->name);
2178 return -EINVAL;
2179 }
2180
2181 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2182 err = dev_uc_del(dev, addr);
2183 else if (is_multicast_ether_addr(addr))
2184 err = dev_mc_del(dev, addr);
2185 else
2186 err = -EINVAL;
2187
2188 return err;
2189 }
2190 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2191
2192 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2193 {
2194 struct net *net = sock_net(skb->sk);
2195 struct ndmsg *ndm;
2196 struct nlattr *tb[NDA_MAX+1];
2197 struct net_device *dev;
2198 int err = -EINVAL;
2199 __u8 *addr;
2200
2201 if (!netlink_capable(skb, CAP_NET_ADMIN))
2202 return -EPERM;
2203
2204 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2205 if (err < 0)
2206 return err;
2207
2208 ndm = nlmsg_data(nlh);
2209 if (ndm->ndm_ifindex == 0) {
2210 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2211 return -EINVAL;
2212 }
2213
2214 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2215 if (dev == NULL) {
2216 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2217 return -ENODEV;
2218 }
2219
2220 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2221 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2222 return -EINVAL;
2223 }
2224
2225 addr = nla_data(tb[NDA_LLADDR]);
2226 if (is_zero_ether_addr(addr)) {
2227 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ether address\n");
2228 return -EINVAL;
2229 }
2230
2231 err = -EOPNOTSUPP;
2232
2233 /* Support fdb on master device the net/bridge default case */
2234 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2235 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2236 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2237 const struct net_device_ops *ops = br_dev->netdev_ops;
2238
2239 if (ops->ndo_fdb_del)
2240 err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2241
2242 if (err)
2243 goto out;
2244 else
2245 ndm->ndm_flags &= ~NTF_MASTER;
2246 }
2247
2248 /* Embedded bridge, macvlan, and any other device support */
2249 if (ndm->ndm_flags & NTF_SELF) {
2250 if (dev->netdev_ops->ndo_fdb_del)
2251 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2252 else
2253 err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2254
2255 if (!err) {
2256 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2257 ndm->ndm_flags &= ~NTF_SELF;
2258 }
2259 }
2260 out:
2261 return err;
2262 }
2263
2264 static int nlmsg_populate_fdb(struct sk_buff *skb,
2265 struct netlink_callback *cb,
2266 struct net_device *dev,
2267 int *idx,
2268 struct netdev_hw_addr_list *list)
2269 {
2270 struct netdev_hw_addr *ha;
2271 int err;
2272 u32 portid, seq;
2273
2274 portid = NETLINK_CB(cb->skb).portid;
2275 seq = cb->nlh->nlmsg_seq;
2276
2277 list_for_each_entry(ha, &list->list, list) {
2278 if (*idx < cb->args[0])
2279 goto skip;
2280
2281 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2282 portid, seq,
2283 RTM_NEWNEIGH, NTF_SELF,
2284 NLM_F_MULTI);
2285 if (err < 0)
2286 return err;
2287 skip:
2288 *idx += 1;
2289 }
2290 return 0;
2291 }
2292
2293 /**
2294 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2295 * @nlh: netlink message header
2296 * @dev: netdevice
2297 *
2298 * Default netdevice operation to dump the existing unicast address list.
2299 * Returns number of addresses from list put in skb.
2300 */
2301 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2302 struct netlink_callback *cb,
2303 struct net_device *dev,
2304 int idx)
2305 {
2306 int err;
2307
2308 netif_addr_lock_bh(dev);
2309 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2310 if (err)
2311 goto out;
2312 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2313 out:
2314 netif_addr_unlock_bh(dev);
2315 return idx;
2316 }
2317 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2318
2319 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2320 {
2321 int idx = 0;
2322 struct net *net = sock_net(skb->sk);
2323 struct net_device *dev;
2324
2325 rcu_read_lock();
2326 for_each_netdev_rcu(net, dev) {
2327 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2328 struct net_device *br_dev;
2329 const struct net_device_ops *ops;
2330
2331 br_dev = netdev_master_upper_dev_get(dev);
2332 ops = br_dev->netdev_ops;
2333 if (ops->ndo_fdb_dump)
2334 idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
2335 }
2336
2337 if (dev->netdev_ops->ndo_fdb_dump)
2338 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
2339 else
2340 idx = ndo_dflt_fdb_dump(skb, cb, dev, idx);
2341 }
2342 rcu_read_unlock();
2343
2344 cb->args[0] = idx;
2345 return skb->len;
2346 }
2347
2348 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2349 struct net_device *dev, u16 mode)
2350 {
2351 struct nlmsghdr *nlh;
2352 struct ifinfomsg *ifm;
2353 struct nlattr *br_afspec;
2354 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2355 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2356
2357 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2358 if (nlh == NULL)
2359 return -EMSGSIZE;
2360
2361 ifm = nlmsg_data(nlh);
2362 ifm->ifi_family = AF_BRIDGE;
2363 ifm->__ifi_pad = 0;
2364 ifm->ifi_type = dev->type;
2365 ifm->ifi_index = dev->ifindex;
2366 ifm->ifi_flags = dev_get_flags(dev);
2367 ifm->ifi_change = 0;
2368
2369
2370 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2371 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2372 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2373 (br_dev &&
2374 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2375 (dev->addr_len &&
2376 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2377 (dev->ifindex != dev->iflink &&
2378 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2379 goto nla_put_failure;
2380
2381 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2382 if (!br_afspec)
2383 goto nla_put_failure;
2384
2385 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2386 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2387 nla_nest_cancel(skb, br_afspec);
2388 goto nla_put_failure;
2389 }
2390 nla_nest_end(skb, br_afspec);
2391
2392 return nlmsg_end(skb, nlh);
2393 nla_put_failure:
2394 nlmsg_cancel(skb, nlh);
2395 return -EMSGSIZE;
2396 }
2397 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2398
2399 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2400 {
2401 struct net *net = sock_net(skb->sk);
2402 struct net_device *dev;
2403 int idx = 0;
2404 u32 portid = NETLINK_CB(cb->skb).portid;
2405 u32 seq = cb->nlh->nlmsg_seq;
2406 struct nlattr *extfilt;
2407 u32 filter_mask = 0;
2408
2409 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2410 IFLA_EXT_MASK);
2411 if (extfilt)
2412 filter_mask = nla_get_u32(extfilt);
2413
2414 rcu_read_lock();
2415 for_each_netdev_rcu(net, dev) {
2416 const struct net_device_ops *ops = dev->netdev_ops;
2417 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2418
2419 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2420 if (idx >= cb->args[0] &&
2421 br_dev->netdev_ops->ndo_bridge_getlink(
2422 skb, portid, seq, dev, filter_mask) < 0)
2423 break;
2424 idx++;
2425 }
2426
2427 if (ops->ndo_bridge_getlink) {
2428 if (idx >= cb->args[0] &&
2429 ops->ndo_bridge_getlink(skb, portid, seq, dev,
2430 filter_mask) < 0)
2431 break;
2432 idx++;
2433 }
2434 }
2435 rcu_read_unlock();
2436 cb->args[0] = idx;
2437
2438 return skb->len;
2439 }
2440
2441 static inline size_t bridge_nlmsg_size(void)
2442 {
2443 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2444 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
2445 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
2446 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
2447 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
2448 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
2449 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
2450 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
2451 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2452 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
2453 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
2454 }
2455
2456 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2457 {
2458 struct net *net = dev_net(dev);
2459 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2460 struct sk_buff *skb;
2461 int err = -EOPNOTSUPP;
2462
2463 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2464 if (!skb) {
2465 err = -ENOMEM;
2466 goto errout;
2467 }
2468
2469 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2470 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2471 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2472 if (err < 0)
2473 goto errout;
2474 }
2475
2476 if ((flags & BRIDGE_FLAGS_SELF) &&
2477 dev->netdev_ops->ndo_bridge_getlink) {
2478 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2479 if (err < 0)
2480 goto errout;
2481 }
2482
2483 if (!skb->len)
2484 goto errout;
2485
2486 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2487 return 0;
2488 errout:
2489 WARN_ON(err == -EMSGSIZE);
2490 kfree_skb(skb);
2491 if (err)
2492 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2493 return err;
2494 }
2495
2496 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2497 {
2498 struct net *net = sock_net(skb->sk);
2499 struct ifinfomsg *ifm;
2500 struct net_device *dev;
2501 struct nlattr *br_spec, *attr = NULL;
2502 int rem, err = -EOPNOTSUPP;
2503 u16 oflags, flags = 0;
2504 bool have_flags = false;
2505
2506 if (nlmsg_len(nlh) < sizeof(*ifm))
2507 return -EINVAL;
2508
2509 ifm = nlmsg_data(nlh);
2510 if (ifm->ifi_family != AF_BRIDGE)
2511 return -EPFNOSUPPORT;
2512
2513 dev = __dev_get_by_index(net, ifm->ifi_index);
2514 if (!dev) {
2515 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2516 return -ENODEV;
2517 }
2518
2519 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2520 if (br_spec) {
2521 nla_for_each_nested(attr, br_spec, rem) {
2522 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2523 have_flags = true;
2524 flags = nla_get_u16(attr);
2525 break;
2526 }
2527 }
2528 }
2529
2530 oflags = flags;
2531
2532 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2533 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2534
2535 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2536 err = -EOPNOTSUPP;
2537 goto out;
2538 }
2539
2540 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2541 if (err)
2542 goto out;
2543
2544 flags &= ~BRIDGE_FLAGS_MASTER;
2545 }
2546
2547 if ((flags & BRIDGE_FLAGS_SELF)) {
2548 if (!dev->netdev_ops->ndo_bridge_setlink)
2549 err = -EOPNOTSUPP;
2550 else
2551 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2552
2553 if (!err)
2554 flags &= ~BRIDGE_FLAGS_SELF;
2555 }
2556
2557 if (have_flags)
2558 memcpy(nla_data(attr), &flags, sizeof(flags));
2559 /* Generate event to notify upper layer of bridge change */
2560 if (!err)
2561 err = rtnl_bridge_notify(dev, oflags);
2562 out:
2563 return err;
2564 }
2565
2566 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2567 {
2568 struct net *net = sock_net(skb->sk);
2569 struct ifinfomsg *ifm;
2570 struct net_device *dev;
2571 struct nlattr *br_spec, *attr = NULL;
2572 int rem, err = -EOPNOTSUPP;
2573 u16 oflags, flags = 0;
2574 bool have_flags = false;
2575
2576 if (nlmsg_len(nlh) < sizeof(*ifm))
2577 return -EINVAL;
2578
2579 ifm = nlmsg_data(nlh);
2580 if (ifm->ifi_family != AF_BRIDGE)
2581 return -EPFNOSUPPORT;
2582
2583 dev = __dev_get_by_index(net, ifm->ifi_index);
2584 if (!dev) {
2585 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2586 return -ENODEV;
2587 }
2588
2589 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2590 if (br_spec) {
2591 nla_for_each_nested(attr, br_spec, rem) {
2592 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2593 have_flags = true;
2594 flags = nla_get_u16(attr);
2595 break;
2596 }
2597 }
2598 }
2599
2600 oflags = flags;
2601
2602 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2603 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2604
2605 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2606 err = -EOPNOTSUPP;
2607 goto out;
2608 }
2609
2610 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2611 if (err)
2612 goto out;
2613
2614 flags &= ~BRIDGE_FLAGS_MASTER;
2615 }
2616
2617 if ((flags & BRIDGE_FLAGS_SELF)) {
2618 if (!dev->netdev_ops->ndo_bridge_dellink)
2619 err = -EOPNOTSUPP;
2620 else
2621 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2622
2623 if (!err)
2624 flags &= ~BRIDGE_FLAGS_SELF;
2625 }
2626
2627 if (have_flags)
2628 memcpy(nla_data(attr), &flags, sizeof(flags));
2629 /* Generate event to notify upper layer of bridge change */
2630 if (!err)
2631 err = rtnl_bridge_notify(dev, oflags);
2632 out:
2633 return err;
2634 }
2635
2636 /* Process one rtnetlink message. */
2637
2638 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2639 {
2640 struct net *net = sock_net(skb->sk);
2641 rtnl_doit_func doit;
2642 int sz_idx, kind;
2643 int family;
2644 int type;
2645 int err;
2646
2647 type = nlh->nlmsg_type;
2648 if (type > RTM_MAX)
2649 return -EOPNOTSUPP;
2650
2651 type -= RTM_BASE;
2652
2653 /* All the messages must have at least 1 byte length */
2654 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2655 return 0;
2656
2657 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2658 sz_idx = type>>2;
2659 kind = type&3;
2660
2661 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
2662 return -EPERM;
2663
2664 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2665 struct sock *rtnl;
2666 rtnl_dumpit_func dumpit;
2667 rtnl_calcit_func calcit;
2668 u16 min_dump_alloc = 0;
2669
2670 dumpit = rtnl_get_dumpit(family, type);
2671 if (dumpit == NULL)
2672 return -EOPNOTSUPP;
2673 calcit = rtnl_get_calcit(family, type);
2674 if (calcit)
2675 min_dump_alloc = calcit(skb, nlh);
2676
2677 __rtnl_unlock();
2678 rtnl = net->rtnl;
2679 {
2680 struct netlink_dump_control c = {
2681 .dump = dumpit,
2682 .min_dump_alloc = min_dump_alloc,
2683 };
2684 err = netlink_dump_start(rtnl, skb, nlh, &c);
2685 }
2686 rtnl_lock();
2687 return err;
2688 }
2689
2690 doit = rtnl_get_doit(family, type);
2691 if (doit == NULL)
2692 return -EOPNOTSUPP;
2693
2694 return doit(skb, nlh);
2695 }
2696
2697 static void rtnetlink_rcv(struct sk_buff *skb)
2698 {
2699 rtnl_lock();
2700 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2701 rtnl_unlock();
2702 }
2703
2704 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2705 {
2706 struct net_device *dev = ptr;
2707
2708 switch (event) {
2709 case NETDEV_UP:
2710 case NETDEV_DOWN:
2711 case NETDEV_PRE_UP:
2712 case NETDEV_POST_INIT:
2713 case NETDEV_REGISTER:
2714 case NETDEV_CHANGE:
2715 case NETDEV_PRE_TYPE_CHANGE:
2716 case NETDEV_GOING_DOWN:
2717 case NETDEV_UNREGISTER:
2718 case NETDEV_UNREGISTER_FINAL:
2719 case NETDEV_RELEASE:
2720 case NETDEV_JOIN:
2721 break;
2722 default:
2723 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2724 break;
2725 }
2726 return NOTIFY_DONE;
2727 }
2728
2729 static struct notifier_block rtnetlink_dev_notifier = {
2730 .notifier_call = rtnetlink_event,
2731 };
2732
2733
2734 static int __net_init rtnetlink_net_init(struct net *net)
2735 {
2736 struct sock *sk;
2737 struct netlink_kernel_cfg cfg = {
2738 .groups = RTNLGRP_MAX,
2739 .input = rtnetlink_rcv,
2740 .cb_mutex = &rtnl_mutex,
2741 .flags = NL_CFG_F_NONROOT_RECV,
2742 };
2743
2744 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
2745 if (!sk)
2746 return -ENOMEM;
2747 net->rtnl = sk;
2748 return 0;
2749 }
2750
2751 static void __net_exit rtnetlink_net_exit(struct net *net)
2752 {
2753 netlink_kernel_release(net->rtnl);
2754 net->rtnl = NULL;
2755 }
2756
2757 static struct pernet_operations rtnetlink_net_ops = {
2758 .init = rtnetlink_net_init,
2759 .exit = rtnetlink_net_exit,
2760 };
2761
2762 void __init rtnetlink_init(void)
2763 {
2764 if (register_pernet_subsys(&rtnetlink_net_ops))
2765 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2766
2767 register_netdevice_notifier(&rtnetlink_dev_notifier);
2768
2769 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2770 rtnl_dump_ifinfo, rtnl_calcit);
2771 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2772 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2773 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2774
2775 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2776 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2777
2778 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
2779 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
2780 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
2781
2782 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
2783 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
2784 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
2785 }
2786