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
rtnl_lock(void)65 void rtnl_lock(void)
66 {
67 mutex_lock(&rtnl_mutex);
68 }
69 EXPORT_SYMBOL(rtnl_lock);
70
__rtnl_unlock(void)71 void __rtnl_unlock(void)
72 {
73 mutex_unlock(&rtnl_mutex);
74 }
75
rtnl_unlock(void)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
rtnl_trylock(void)83 int rtnl_trylock(void)
84 {
85 return mutex_trylock(&rtnl_mutex);
86 }
87 EXPORT_SYMBOL(rtnl_trylock);
88
rtnl_is_locked(void)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
lockdep_rtnl_is_held(void)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
rtm_msgindex(int msgtype)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
rtnl_get_doit(int protocol,int msgindex)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
rtnl_get_dumpit(int protocol,int msgindex)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
rtnl_get_calcit(int protocol,int msgindex)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 */
__rtnl_register(int protocol,int msgtype,rtnl_doit_func doit,rtnl_dumpit_func dumpit,rtnl_calcit_func calcit)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 */
rtnl_register(int protocol,int msgtype,rtnl_doit_func doit,rtnl_dumpit_func dumpit,rtnl_calcit_func calcit)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 */
rtnl_unregister(int protocol,int msgtype)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 */
rtnl_unregister_all(int protocol)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
rtnl_link_ops_get(const char * kind)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 */
__rtnl_link_register(struct rtnl_link_ops * ops)297 int __rtnl_link_register(struct rtnl_link_ops *ops)
298 {
299 if (rtnl_link_ops_get(ops->kind))
300 return -EEXIST;
301
302 /* The check for setup is here because if ops
303 * does not have that filled up, it is not possible
304 * to use the ops for creating device. So do not
305 * fill up dellink as well. That disables rtnl_dellink.
306 */
307 if (ops->setup && !ops->dellink)
308 ops->dellink = unregister_netdevice_queue;
309
310 list_add_tail(&ops->list, &link_ops);
311 return 0;
312 }
313 EXPORT_SYMBOL_GPL(__rtnl_link_register);
314
315 /**
316 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
317 * @ops: struct rtnl_link_ops * to register
318 *
319 * Returns 0 on success or a negative error code.
320 */
rtnl_link_register(struct rtnl_link_ops * ops)321 int rtnl_link_register(struct rtnl_link_ops *ops)
322 {
323 int err;
324
325 rtnl_lock();
326 err = __rtnl_link_register(ops);
327 rtnl_unlock();
328 return err;
329 }
330 EXPORT_SYMBOL_GPL(rtnl_link_register);
331
__rtnl_kill_links(struct net * net,struct rtnl_link_ops * ops)332 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
333 {
334 struct net_device *dev;
335 LIST_HEAD(list_kill);
336
337 for_each_netdev(net, dev) {
338 if (dev->rtnl_link_ops == ops)
339 ops->dellink(dev, &list_kill);
340 }
341 unregister_netdevice_many(&list_kill);
342 }
343
344 /**
345 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
346 * @ops: struct rtnl_link_ops * to unregister
347 *
348 * The caller must hold the rtnl_mutex.
349 */
__rtnl_link_unregister(struct rtnl_link_ops * ops)350 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
351 {
352 struct net *net;
353
354 for_each_net(net) {
355 __rtnl_kill_links(net, ops);
356 }
357 list_del(&ops->list);
358 }
359 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
360
361 /* Return with the rtnl_lock held when there are no network
362 * devices unregistering in any network namespace.
363 */
rtnl_lock_unregistering_all(void)364 static void rtnl_lock_unregistering_all(void)
365 {
366 struct net *net;
367 bool unregistering;
368 DEFINE_WAIT(wait);
369
370 for (;;) {
371 prepare_to_wait(&netdev_unregistering_wq, &wait,
372 TASK_UNINTERRUPTIBLE);
373 unregistering = false;
374 rtnl_lock();
375 for_each_net(net) {
376 if (net->dev_unreg_count > 0) {
377 unregistering = true;
378 break;
379 }
380 }
381 if (!unregistering)
382 break;
383 __rtnl_unlock();
384 schedule();
385 }
386 finish_wait(&netdev_unregistering_wq, &wait);
387 }
388
389 /**
390 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
391 * @ops: struct rtnl_link_ops * to unregister
392 */
rtnl_link_unregister(struct rtnl_link_ops * ops)393 void rtnl_link_unregister(struct rtnl_link_ops *ops)
394 {
395 /* Close the race with cleanup_net() */
396 mutex_lock(&net_mutex);
397 rtnl_lock_unregistering_all();
398 __rtnl_link_unregister(ops);
399 rtnl_unlock();
400 mutex_unlock(&net_mutex);
401 }
402 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
403
rtnl_link_get_slave_info_data_size(const struct net_device * dev)404 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
405 {
406 struct net_device *master_dev;
407 const struct rtnl_link_ops *ops;
408
409 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
410 if (!master_dev)
411 return 0;
412 ops = master_dev->rtnl_link_ops;
413 if (!ops || !ops->get_slave_size)
414 return 0;
415 /* IFLA_INFO_SLAVE_DATA + nested data */
416 return nla_total_size(sizeof(struct nlattr)) +
417 ops->get_slave_size(master_dev, dev);
418 }
419
rtnl_link_get_size(const struct net_device * dev)420 static size_t rtnl_link_get_size(const struct net_device *dev)
421 {
422 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
423 size_t size;
424
425 if (!ops)
426 return 0;
427
428 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
429 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
430
431 if (ops->get_size)
432 /* IFLA_INFO_DATA + nested data */
433 size += nla_total_size(sizeof(struct nlattr)) +
434 ops->get_size(dev);
435
436 if (ops->get_xstats_size)
437 /* IFLA_INFO_XSTATS */
438 size += nla_total_size(ops->get_xstats_size(dev));
439
440 size += rtnl_link_get_slave_info_data_size(dev);
441
442 return size;
443 }
444
445 static LIST_HEAD(rtnl_af_ops);
446
rtnl_af_lookup(const int family)447 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
448 {
449 const struct rtnl_af_ops *ops;
450
451 list_for_each_entry(ops, &rtnl_af_ops, list) {
452 if (ops->family == family)
453 return ops;
454 }
455
456 return NULL;
457 }
458
459 /**
460 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
461 * @ops: struct rtnl_af_ops * to register
462 *
463 * Returns 0 on success or a negative error code.
464 */
rtnl_af_register(struct rtnl_af_ops * ops)465 void rtnl_af_register(struct rtnl_af_ops *ops)
466 {
467 rtnl_lock();
468 list_add_tail(&ops->list, &rtnl_af_ops);
469 rtnl_unlock();
470 }
471 EXPORT_SYMBOL_GPL(rtnl_af_register);
472
473 /**
474 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
475 * @ops: struct rtnl_af_ops * to unregister
476 *
477 * The caller must hold the rtnl_mutex.
478 */
__rtnl_af_unregister(struct rtnl_af_ops * ops)479 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
480 {
481 list_del(&ops->list);
482 }
483 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
484
485 /**
486 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
487 * @ops: struct rtnl_af_ops * to unregister
488 */
rtnl_af_unregister(struct rtnl_af_ops * ops)489 void rtnl_af_unregister(struct rtnl_af_ops *ops)
490 {
491 rtnl_lock();
492 __rtnl_af_unregister(ops);
493 rtnl_unlock();
494 }
495 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
496
rtnl_link_get_af_size(const struct net_device * dev)497 static size_t rtnl_link_get_af_size(const struct net_device *dev)
498 {
499 struct rtnl_af_ops *af_ops;
500 size_t size;
501
502 /* IFLA_AF_SPEC */
503 size = nla_total_size(sizeof(struct nlattr));
504
505 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
506 if (af_ops->get_link_af_size) {
507 /* AF_* + nested data */
508 size += nla_total_size(sizeof(struct nlattr)) +
509 af_ops->get_link_af_size(dev);
510 }
511 }
512
513 return size;
514 }
515
rtnl_have_link_slave_info(const struct net_device * dev)516 static bool rtnl_have_link_slave_info(const struct net_device *dev)
517 {
518 struct net_device *master_dev;
519
520 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
521 if (master_dev && master_dev->rtnl_link_ops)
522 return true;
523 return false;
524 }
525
rtnl_link_slave_info_fill(struct sk_buff * skb,const struct net_device * dev)526 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
527 const struct net_device *dev)
528 {
529 struct net_device *master_dev;
530 const struct rtnl_link_ops *ops;
531 struct nlattr *slave_data;
532 int err;
533
534 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
535 if (!master_dev)
536 return 0;
537 ops = master_dev->rtnl_link_ops;
538 if (!ops)
539 return 0;
540 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
541 return -EMSGSIZE;
542 if (ops->fill_slave_info) {
543 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
544 if (!slave_data)
545 return -EMSGSIZE;
546 err = ops->fill_slave_info(skb, master_dev, dev);
547 if (err < 0)
548 goto err_cancel_slave_data;
549 nla_nest_end(skb, slave_data);
550 }
551 return 0;
552
553 err_cancel_slave_data:
554 nla_nest_cancel(skb, slave_data);
555 return err;
556 }
557
rtnl_link_info_fill(struct sk_buff * skb,const struct net_device * dev)558 static int rtnl_link_info_fill(struct sk_buff *skb,
559 const struct net_device *dev)
560 {
561 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
562 struct nlattr *data;
563 int err;
564
565 if (!ops)
566 return 0;
567 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
568 return -EMSGSIZE;
569 if (ops->fill_xstats) {
570 err = ops->fill_xstats(skb, dev);
571 if (err < 0)
572 return err;
573 }
574 if (ops->fill_info) {
575 data = nla_nest_start(skb, IFLA_INFO_DATA);
576 if (data == NULL)
577 return -EMSGSIZE;
578 err = ops->fill_info(skb, dev);
579 if (err < 0)
580 goto err_cancel_data;
581 nla_nest_end(skb, data);
582 }
583 return 0;
584
585 err_cancel_data:
586 nla_nest_cancel(skb, data);
587 return err;
588 }
589
rtnl_link_fill(struct sk_buff * skb,const struct net_device * dev)590 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
591 {
592 struct nlattr *linkinfo;
593 int err = -EMSGSIZE;
594
595 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
596 if (linkinfo == NULL)
597 goto out;
598
599 err = rtnl_link_info_fill(skb, dev);
600 if (err < 0)
601 goto err_cancel_link;
602
603 err = rtnl_link_slave_info_fill(skb, dev);
604 if (err < 0)
605 goto err_cancel_link;
606
607 nla_nest_end(skb, linkinfo);
608 return 0;
609
610 err_cancel_link:
611 nla_nest_cancel(skb, linkinfo);
612 out:
613 return err;
614 }
615
rtnetlink_send(struct sk_buff * skb,struct net * net,u32 pid,unsigned int group,int echo)616 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
617 {
618 struct sock *rtnl = net->rtnl;
619 int err = 0;
620
621 NETLINK_CB(skb).dst_group = group;
622 if (echo)
623 atomic_inc(&skb->users);
624 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
625 if (echo)
626 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
627 return err;
628 }
629
rtnl_unicast(struct sk_buff * skb,struct net * net,u32 pid)630 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
631 {
632 struct sock *rtnl = net->rtnl;
633
634 return nlmsg_unicast(rtnl, skb, pid);
635 }
636 EXPORT_SYMBOL(rtnl_unicast);
637
rtnl_notify(struct sk_buff * skb,struct net * net,u32 pid,u32 group,struct nlmsghdr * nlh,gfp_t flags)638 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
639 struct nlmsghdr *nlh, gfp_t flags)
640 {
641 struct sock *rtnl = net->rtnl;
642 int report = 0;
643
644 if (nlh)
645 report = nlmsg_report(nlh);
646
647 nlmsg_notify(rtnl, skb, pid, group, report, flags);
648 }
649 EXPORT_SYMBOL(rtnl_notify);
650
rtnl_set_sk_err(struct net * net,u32 group,int error)651 void rtnl_set_sk_err(struct net *net, u32 group, int error)
652 {
653 struct sock *rtnl = net->rtnl;
654
655 netlink_set_err(rtnl, 0, group, error);
656 }
657 EXPORT_SYMBOL(rtnl_set_sk_err);
658
rtnetlink_put_metrics(struct sk_buff * skb,u32 * metrics)659 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
660 {
661 struct nlattr *mx;
662 int i, valid = 0;
663
664 mx = nla_nest_start(skb, RTA_METRICS);
665 if (mx == NULL)
666 return -ENOBUFS;
667
668 for (i = 0; i < RTAX_MAX; i++) {
669 if (metrics[i]) {
670 valid++;
671 if (nla_put_u32(skb, i+1, metrics[i]))
672 goto nla_put_failure;
673 }
674 }
675
676 if (!valid) {
677 nla_nest_cancel(skb, mx);
678 return 0;
679 }
680
681 return nla_nest_end(skb, mx);
682
683 nla_put_failure:
684 nla_nest_cancel(skb, mx);
685 return -EMSGSIZE;
686 }
687 EXPORT_SYMBOL(rtnetlink_put_metrics);
688
rtnl_put_cacheinfo(struct sk_buff * skb,struct dst_entry * dst,u32 id,long expires,u32 error)689 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
690 long expires, u32 error)
691 {
692 struct rta_cacheinfo ci = {
693 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
694 .rta_used = dst->__use,
695 .rta_clntref = atomic_read(&(dst->__refcnt)),
696 .rta_error = error,
697 .rta_id = id,
698 };
699
700 if (expires) {
701 unsigned long clock;
702
703 clock = jiffies_to_clock_t(abs(expires));
704 clock = min_t(unsigned long, clock, INT_MAX);
705 ci.rta_expires = (expires > 0) ? clock : -clock;
706 }
707 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
708 }
709 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
710
set_operstate(struct net_device * dev,unsigned char transition)711 static void set_operstate(struct net_device *dev, unsigned char transition)
712 {
713 unsigned char operstate = dev->operstate;
714
715 switch (transition) {
716 case IF_OPER_UP:
717 if ((operstate == IF_OPER_DORMANT ||
718 operstate == IF_OPER_UNKNOWN) &&
719 !netif_dormant(dev))
720 operstate = IF_OPER_UP;
721 break;
722
723 case IF_OPER_DORMANT:
724 if (operstate == IF_OPER_UP ||
725 operstate == IF_OPER_UNKNOWN)
726 operstate = IF_OPER_DORMANT;
727 break;
728 }
729
730 if (dev->operstate != operstate) {
731 write_lock_bh(&dev_base_lock);
732 dev->operstate = operstate;
733 write_unlock_bh(&dev_base_lock);
734 netdev_state_change(dev);
735 }
736 }
737
rtnl_dev_get_flags(const struct net_device * dev)738 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
739 {
740 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
741 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
742 }
743
rtnl_dev_combine_flags(const struct net_device * dev,const struct ifinfomsg * ifm)744 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
745 const struct ifinfomsg *ifm)
746 {
747 unsigned int flags = ifm->ifi_flags;
748
749 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
750 if (ifm->ifi_change)
751 flags = (flags & ifm->ifi_change) |
752 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
753
754 return flags;
755 }
756
copy_rtnl_link_stats(struct rtnl_link_stats * a,const struct rtnl_link_stats64 * b)757 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
758 const struct rtnl_link_stats64 *b)
759 {
760 a->rx_packets = b->rx_packets;
761 a->tx_packets = b->tx_packets;
762 a->rx_bytes = b->rx_bytes;
763 a->tx_bytes = b->tx_bytes;
764 a->rx_errors = b->rx_errors;
765 a->tx_errors = b->tx_errors;
766 a->rx_dropped = b->rx_dropped;
767 a->tx_dropped = b->tx_dropped;
768
769 a->multicast = b->multicast;
770 a->collisions = b->collisions;
771
772 a->rx_length_errors = b->rx_length_errors;
773 a->rx_over_errors = b->rx_over_errors;
774 a->rx_crc_errors = b->rx_crc_errors;
775 a->rx_frame_errors = b->rx_frame_errors;
776 a->rx_fifo_errors = b->rx_fifo_errors;
777 a->rx_missed_errors = b->rx_missed_errors;
778
779 a->tx_aborted_errors = b->tx_aborted_errors;
780 a->tx_carrier_errors = b->tx_carrier_errors;
781 a->tx_fifo_errors = b->tx_fifo_errors;
782 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
783 a->tx_window_errors = b->tx_window_errors;
784
785 a->rx_compressed = b->rx_compressed;
786 a->tx_compressed = b->tx_compressed;
787 }
788
copy_rtnl_link_stats64(void * v,const struct rtnl_link_stats64 * b)789 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
790 {
791 memcpy(v, b, sizeof(*b));
792 }
793
794 /* All VF info */
rtnl_vfinfo_size(const struct net_device * dev,u32 ext_filter_mask)795 static inline int rtnl_vfinfo_size(const struct net_device *dev,
796 u32 ext_filter_mask)
797 {
798 if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
799 (ext_filter_mask & RTEXT_FILTER_VF)) {
800 int num_vfs = dev_num_vf(dev->dev.parent);
801 size_t size = nla_total_size(sizeof(struct nlattr));
802 size += nla_total_size(num_vfs * sizeof(struct nlattr));
803 size += num_vfs *
804 (nla_total_size(sizeof(struct ifla_vf_mac)) +
805 nla_total_size(sizeof(struct ifla_vf_vlan)) +
806 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
807 nla_total_size(sizeof(struct ifla_vf_rate)) +
808 nla_total_size(sizeof(struct ifla_vf_link_state)) +
809 nla_total_size(sizeof(struct ifla_vf_rss_query_en)));
810 return size;
811 } else
812 return 0;
813 }
814
rtnl_port_size(const struct net_device * dev,u32 ext_filter_mask)815 static size_t rtnl_port_size(const struct net_device *dev,
816 u32 ext_filter_mask)
817 {
818 size_t port_size = nla_total_size(4) /* PORT_VF */
819 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
820 + nla_total_size(sizeof(struct ifla_port_vsi))
821 /* PORT_VSI_TYPE */
822 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
823 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
824 + nla_total_size(1) /* PROT_VDP_REQUEST */
825 + nla_total_size(2); /* PORT_VDP_RESPONSE */
826 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
827 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
828 + port_size;
829 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
830 + port_size;
831
832 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
833 !(ext_filter_mask & RTEXT_FILTER_VF))
834 return 0;
835 if (dev_num_vf(dev->dev.parent))
836 return port_self_size + vf_ports_size +
837 vf_port_size * dev_num_vf(dev->dev.parent);
838 else
839 return port_self_size;
840 }
841
if_nlmsg_size(const struct net_device * dev,u32 ext_filter_mask)842 static noinline size_t if_nlmsg_size(const struct net_device *dev,
843 u32 ext_filter_mask)
844 {
845 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
846 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
847 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
848 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
849 + nla_total_size(sizeof(struct rtnl_link_ifmap))
850 + nla_total_size(sizeof(struct rtnl_link_stats))
851 + nla_total_size(sizeof(struct rtnl_link_stats64))
852 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
853 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
854 + nla_total_size(4) /* IFLA_TXQLEN */
855 + nla_total_size(4) /* IFLA_WEIGHT */
856 + nla_total_size(4) /* IFLA_MTU */
857 + nla_total_size(4) /* IFLA_LINK */
858 + nla_total_size(4) /* IFLA_MASTER */
859 + nla_total_size(1) /* IFLA_CARRIER */
860 + nla_total_size(4) /* IFLA_PROMISCUITY */
861 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
862 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
863 + nla_total_size(1) /* IFLA_OPERSTATE */
864 + nla_total_size(1) /* IFLA_LINKMODE */
865 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
866 + nla_total_size(ext_filter_mask
867 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
868 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
869 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
870 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
871 + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
872 + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */
873 }
874
rtnl_vf_ports_fill(struct sk_buff * skb,struct net_device * dev)875 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
876 {
877 struct nlattr *vf_ports;
878 struct nlattr *vf_port;
879 int vf;
880 int err;
881
882 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
883 if (!vf_ports)
884 return -EMSGSIZE;
885
886 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
887 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
888 if (!vf_port)
889 goto nla_put_failure;
890 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
891 goto nla_put_failure;
892 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
893 if (err == -EMSGSIZE)
894 goto nla_put_failure;
895 if (err) {
896 nla_nest_cancel(skb, vf_port);
897 continue;
898 }
899 nla_nest_end(skb, vf_port);
900 }
901
902 nla_nest_end(skb, vf_ports);
903
904 return 0;
905
906 nla_put_failure:
907 nla_nest_cancel(skb, vf_ports);
908 return -EMSGSIZE;
909 }
910
rtnl_port_self_fill(struct sk_buff * skb,struct net_device * dev)911 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
912 {
913 struct nlattr *port_self;
914 int err;
915
916 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
917 if (!port_self)
918 return -EMSGSIZE;
919
920 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
921 if (err) {
922 nla_nest_cancel(skb, port_self);
923 return (err == -EMSGSIZE) ? err : 0;
924 }
925
926 nla_nest_end(skb, port_self);
927
928 return 0;
929 }
930
rtnl_port_fill(struct sk_buff * skb,struct net_device * dev,u32 ext_filter_mask)931 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
932 u32 ext_filter_mask)
933 {
934 int err;
935
936 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
937 !(ext_filter_mask & RTEXT_FILTER_VF))
938 return 0;
939
940 err = rtnl_port_self_fill(skb, dev);
941 if (err)
942 return err;
943
944 if (dev_num_vf(dev->dev.parent)) {
945 err = rtnl_vf_ports_fill(skb, dev);
946 if (err)
947 return err;
948 }
949
950 return 0;
951 }
952
rtnl_phys_port_id_fill(struct sk_buff * skb,struct net_device * dev)953 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
954 {
955 int err;
956 struct netdev_phys_port_id ppid;
957
958 err = dev_get_phys_port_id(dev, &ppid);
959 if (err) {
960 if (err == -EOPNOTSUPP)
961 return 0;
962 return err;
963 }
964
965 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
966 return -EMSGSIZE;
967
968 return 0;
969 }
970
rtnl_fill_ifinfo(struct sk_buff * skb,struct net_device * dev,int type,u32 pid,u32 seq,u32 change,unsigned int flags,u32 ext_filter_mask)971 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
972 int type, u32 pid, u32 seq, u32 change,
973 unsigned int flags, u32 ext_filter_mask)
974 {
975 struct ifinfomsg *ifm;
976 struct nlmsghdr *nlh;
977 struct rtnl_link_stats64 temp;
978 const struct rtnl_link_stats64 *stats;
979 struct nlattr *attr, *af_spec;
980 struct rtnl_af_ops *af_ops;
981 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
982
983 ASSERT_RTNL();
984 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
985 if (nlh == NULL)
986 return -EMSGSIZE;
987
988 ifm = nlmsg_data(nlh);
989 ifm->ifi_family = AF_UNSPEC;
990 ifm->__ifi_pad = 0;
991 ifm->ifi_type = dev->type;
992 ifm->ifi_index = dev->ifindex;
993 ifm->ifi_flags = dev_get_flags(dev);
994 ifm->ifi_change = change;
995
996 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
997 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
998 nla_put_u8(skb, IFLA_OPERSTATE,
999 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1000 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1001 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1002 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1003 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1004 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1005 #ifdef CONFIG_RPS
1006 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1007 #endif
1008 (dev->ifindex != dev->iflink &&
1009 nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
1010 (upper_dev &&
1011 nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1012 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1013 (dev->qdisc &&
1014 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1015 (dev->ifalias &&
1016 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1017 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1018 atomic_read(&dev->carrier_changes)))
1019 goto nla_put_failure;
1020
1021 if (1) {
1022 struct rtnl_link_ifmap map;
1023
1024 memset(&map, 0, sizeof(map));
1025 map.mem_start = dev->mem_start;
1026 map.mem_end = dev->mem_end;
1027 map.base_addr = dev->base_addr;
1028 map.irq = dev->irq;
1029 map.dma = dev->dma;
1030 map.port = dev->if_port;
1031
1032 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1033 goto nla_put_failure;
1034 }
1035
1036 if (dev->addr_len) {
1037 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1038 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1039 goto nla_put_failure;
1040 }
1041
1042 if (rtnl_phys_port_id_fill(skb, dev))
1043 goto nla_put_failure;
1044
1045 attr = nla_reserve(skb, IFLA_STATS,
1046 sizeof(struct rtnl_link_stats));
1047 if (attr == NULL)
1048 goto nla_put_failure;
1049
1050 stats = dev_get_stats(dev, &temp);
1051 copy_rtnl_link_stats(nla_data(attr), stats);
1052
1053 attr = nla_reserve(skb, IFLA_STATS64,
1054 sizeof(struct rtnl_link_stats64));
1055 if (attr == NULL)
1056 goto nla_put_failure;
1057 copy_rtnl_link_stats64(nla_data(attr), stats);
1058
1059 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1060 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1061 goto nla_put_failure;
1062
1063 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1064 && (ext_filter_mask & RTEXT_FILTER_VF)) {
1065 int i;
1066
1067 struct nlattr *vfinfo, *vf;
1068 int num_vfs = dev_num_vf(dev->dev.parent);
1069
1070 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1071 if (!vfinfo)
1072 goto nla_put_failure;
1073 for (i = 0; i < num_vfs; i++) {
1074 struct ifla_vf_info ivi;
1075 struct ifla_vf_mac vf_mac;
1076 struct ifla_vf_vlan vf_vlan;
1077 struct ifla_vf_rate vf_rate;
1078 struct ifla_vf_tx_rate vf_tx_rate;
1079 struct ifla_vf_spoofchk vf_spoofchk;
1080 struct ifla_vf_link_state vf_linkstate;
1081 struct ifla_vf_rss_query_en vf_rss_query_en;
1082
1083 /*
1084 * Not all SR-IOV capable drivers support the
1085 * spoofcheck and "RSS query enable" query. Preset to
1086 * -1 so the user space tool can detect that the driver
1087 * didn't report anything.
1088 */
1089 ivi.spoofchk = -1;
1090 ivi.rss_query_en = -1;
1091 memset(ivi.mac, 0, sizeof(ivi.mac));
1092 /* The default value for VF link state is "auto"
1093 * IFLA_VF_LINK_STATE_AUTO which equals zero
1094 */
1095 ivi.linkstate = 0;
1096 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1097 break;
1098 vf_mac.vf =
1099 vf_vlan.vf =
1100 vf_rate.vf =
1101 vf_tx_rate.vf =
1102 vf_spoofchk.vf =
1103 vf_linkstate.vf =
1104 vf_rss_query_en.vf = ivi.vf;
1105
1106 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1107 vf_vlan.vlan = ivi.vlan;
1108 vf_vlan.qos = ivi.qos;
1109 vf_tx_rate.rate = ivi.max_tx_rate;
1110 vf_rate.min_tx_rate = ivi.min_tx_rate;
1111 vf_rate.max_tx_rate = ivi.max_tx_rate;
1112 vf_spoofchk.setting = ivi.spoofchk;
1113 vf_linkstate.link_state = ivi.linkstate;
1114 vf_rss_query_en.setting = ivi.rss_query_en;
1115 vf = nla_nest_start(skb, IFLA_VF_INFO);
1116 if (!vf) {
1117 nla_nest_cancel(skb, vfinfo);
1118 goto nla_put_failure;
1119 }
1120 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1121 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1122 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1123 &vf_rate) ||
1124 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1125 &vf_tx_rate) ||
1126 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1127 &vf_spoofchk) ||
1128 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1129 &vf_linkstate) ||
1130 nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1131 sizeof(vf_rss_query_en),
1132 &vf_rss_query_en))
1133 goto nla_put_failure;
1134 nla_nest_end(skb, vf);
1135 }
1136 nla_nest_end(skb, vfinfo);
1137 }
1138
1139 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1140 goto nla_put_failure;
1141
1142 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1143 if (rtnl_link_fill(skb, dev) < 0)
1144 goto nla_put_failure;
1145 }
1146
1147 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1148 goto nla_put_failure;
1149
1150 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1151 if (af_ops->fill_link_af) {
1152 struct nlattr *af;
1153 int err;
1154
1155 if (!(af = nla_nest_start(skb, af_ops->family)))
1156 goto nla_put_failure;
1157
1158 err = af_ops->fill_link_af(skb, dev);
1159
1160 /*
1161 * Caller may return ENODATA to indicate that there
1162 * was no data to be dumped. This is not an error, it
1163 * means we should trim the attribute header and
1164 * continue.
1165 */
1166 if (err == -ENODATA)
1167 nla_nest_cancel(skb, af);
1168 else if (err < 0)
1169 goto nla_put_failure;
1170
1171 nla_nest_end(skb, af);
1172 }
1173 }
1174
1175 nla_nest_end(skb, af_spec);
1176
1177 return nlmsg_end(skb, nlh);
1178
1179 nla_put_failure:
1180 nlmsg_cancel(skb, nlh);
1181 return -EMSGSIZE;
1182 }
1183
1184 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1185 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1186 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1187 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1188 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1189 [IFLA_MTU] = { .type = NLA_U32 },
1190 [IFLA_LINK] = { .type = NLA_U32 },
1191 [IFLA_MASTER] = { .type = NLA_U32 },
1192 [IFLA_CARRIER] = { .type = NLA_U8 },
1193 [IFLA_TXQLEN] = { .type = NLA_U32 },
1194 [IFLA_WEIGHT] = { .type = NLA_U32 },
1195 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1196 [IFLA_LINKMODE] = { .type = NLA_U8 },
1197 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1198 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1199 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1200 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1201 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1202 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1203 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1204 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1205 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1206 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1207 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1208 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1209 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
1210 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1211 };
1212
1213 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1214 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1215 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1216 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1217 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1218 };
1219
1220 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1221 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
1222 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
1223 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
1224 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
1225 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) },
1226 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) },
1227 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) },
1228 };
1229
1230 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1231 [IFLA_PORT_VF] = { .type = NLA_U32 },
1232 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1233 .len = PORT_PROFILE_MAX },
1234 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1235 .len = sizeof(struct ifla_port_vsi)},
1236 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1237 .len = PORT_UUID_MAX },
1238 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1239 .len = PORT_UUID_MAX },
1240 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1241 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1242 };
1243
rtnl_dump_ifinfo(struct sk_buff * skb,struct netlink_callback * cb)1244 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1245 {
1246 struct net *net = sock_net(skb->sk);
1247 int h, s_h;
1248 int idx = 0, s_idx;
1249 struct net_device *dev;
1250 struct hlist_head *head;
1251 struct nlattr *tb[IFLA_MAX+1];
1252 u32 ext_filter_mask = 0;
1253 int err;
1254 int hdrlen;
1255
1256 s_h = cb->args[0];
1257 s_idx = cb->args[1];
1258
1259 cb->seq = net->dev_base_seq;
1260
1261 /* A hack to preserve kernel<->userspace interface.
1262 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1263 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1264 * what iproute2 < v3.9.0 used.
1265 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1266 * attribute, its netlink message is shorter than struct ifinfomsg.
1267 */
1268 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1269 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1270
1271 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1272
1273 if (tb[IFLA_EXT_MASK])
1274 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1275 }
1276
1277 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1278 idx = 0;
1279 head = &net->dev_index_head[h];
1280 hlist_for_each_entry(dev, head, index_hlist) {
1281 if (idx < s_idx)
1282 goto cont;
1283 err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1284 NETLINK_CB(cb->skb).portid,
1285 cb->nlh->nlmsg_seq, 0,
1286 NLM_F_MULTI,
1287 ext_filter_mask);
1288 /* If we ran out of room on the first message,
1289 * we're in trouble
1290 */
1291 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1292
1293 if (err <= 0)
1294 goto out;
1295
1296 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1297 cont:
1298 idx++;
1299 }
1300 }
1301 out:
1302 cb->args[1] = idx;
1303 cb->args[0] = h;
1304
1305 return skb->len;
1306 }
1307
rtnl_nla_parse_ifla(struct nlattr ** tb,const struct nlattr * head,int len)1308 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1309 {
1310 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1311 }
1312 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1313
rtnl_link_get_net(struct net * src_net,struct nlattr * tb[])1314 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1315 {
1316 struct net *net;
1317 /* Examine the link attributes and figure out which
1318 * network namespace we are talking about.
1319 */
1320 if (tb[IFLA_NET_NS_PID])
1321 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1322 else if (tb[IFLA_NET_NS_FD])
1323 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1324 else
1325 net = get_net(src_net);
1326 return net;
1327 }
1328 EXPORT_SYMBOL(rtnl_link_get_net);
1329
validate_linkmsg(struct net_device * dev,struct nlattr * tb[])1330 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1331 {
1332 if (dev) {
1333 if (tb[IFLA_ADDRESS] &&
1334 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1335 return -EINVAL;
1336
1337 if (tb[IFLA_BROADCAST] &&
1338 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1339 return -EINVAL;
1340 }
1341
1342 if (tb[IFLA_AF_SPEC]) {
1343 struct nlattr *af;
1344 int rem, err;
1345
1346 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1347 const struct rtnl_af_ops *af_ops;
1348
1349 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1350 return -EAFNOSUPPORT;
1351
1352 if (!af_ops->set_link_af)
1353 return -EOPNOTSUPP;
1354
1355 if (af_ops->validate_link_af) {
1356 err = af_ops->validate_link_af(dev, af);
1357 if (err < 0)
1358 return err;
1359 }
1360 }
1361 }
1362
1363 return 0;
1364 }
1365
do_setvfinfo(struct net_device * dev,struct nlattr ** tb)1366 static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
1367 {
1368 const struct net_device_ops *ops = dev->netdev_ops;
1369 int err = -EINVAL;
1370
1371 if (tb[IFLA_VF_MAC]) {
1372 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
1373
1374 err = -EOPNOTSUPP;
1375 if (ops->ndo_set_vf_mac)
1376 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1377 ivm->mac);
1378 if (err < 0)
1379 return err;
1380 }
1381
1382 if (tb[IFLA_VF_VLAN]) {
1383 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
1384
1385 err = -EOPNOTSUPP;
1386 if (ops->ndo_set_vf_vlan)
1387 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
1388 ivv->qos);
1389 if (err < 0)
1390 return err;
1391 }
1392
1393 if (tb[IFLA_VF_TX_RATE]) {
1394 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
1395 struct ifla_vf_info ivf;
1396
1397 err = -EOPNOTSUPP;
1398 if (ops->ndo_get_vf_config)
1399 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
1400 if (err < 0)
1401 return err;
1402
1403 err = -EOPNOTSUPP;
1404 if (ops->ndo_set_vf_rate)
1405 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1406 ivf.min_tx_rate,
1407 ivt->rate);
1408 if (err < 0)
1409 return err;
1410 }
1411
1412 if (tb[IFLA_VF_RATE]) {
1413 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
1414
1415 err = -EOPNOTSUPP;
1416 if (ops->ndo_set_vf_rate)
1417 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1418 ivt->min_tx_rate,
1419 ivt->max_tx_rate);
1420 if (err < 0)
1421 return err;
1422 }
1423
1424 if (tb[IFLA_VF_SPOOFCHK]) {
1425 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
1426
1427 err = -EOPNOTSUPP;
1428 if (ops->ndo_set_vf_spoofchk)
1429 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1430 ivs->setting);
1431 if (err < 0)
1432 return err;
1433 }
1434
1435 if (tb[IFLA_VF_LINK_STATE]) {
1436 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
1437
1438 err = -EOPNOTSUPP;
1439 if (ops->ndo_set_vf_link_state)
1440 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1441 ivl->link_state);
1442 if (err < 0)
1443 return err;
1444 }
1445
1446 if (tb[IFLA_VF_RSS_QUERY_EN]) {
1447 struct ifla_vf_rss_query_en *ivrssq_en;
1448
1449 err = -EOPNOTSUPP;
1450 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
1451 if (ops->ndo_set_vf_rss_query_en)
1452 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
1453 ivrssq_en->setting);
1454 if (err < 0)
1455 return err;
1456 }
1457
1458 return err;
1459 }
1460
do_set_master(struct net_device * dev,int ifindex)1461 static int do_set_master(struct net_device *dev, int ifindex)
1462 {
1463 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1464 const struct net_device_ops *ops;
1465 int err;
1466
1467 if (upper_dev) {
1468 if (upper_dev->ifindex == ifindex)
1469 return 0;
1470 ops = upper_dev->netdev_ops;
1471 if (ops->ndo_del_slave) {
1472 err = ops->ndo_del_slave(upper_dev, dev);
1473 if (err)
1474 return err;
1475 } else {
1476 return -EOPNOTSUPP;
1477 }
1478 }
1479
1480 if (ifindex) {
1481 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1482 if (!upper_dev)
1483 return -EINVAL;
1484 ops = upper_dev->netdev_ops;
1485 if (ops->ndo_add_slave) {
1486 err = ops->ndo_add_slave(upper_dev, dev);
1487 if (err)
1488 return err;
1489 } else {
1490 return -EOPNOTSUPP;
1491 }
1492 }
1493 return 0;
1494 }
1495
1496 #define DO_SETLINK_MODIFIED 0x01
1497 /* notify flag means notify + modified. */
1498 #define DO_SETLINK_NOTIFY 0x03
do_setlink(const struct sk_buff * skb,struct net_device * dev,struct ifinfomsg * ifm,struct nlattr ** tb,char * ifname,int status)1499 static int do_setlink(const struct sk_buff *skb,
1500 struct net_device *dev, struct ifinfomsg *ifm,
1501 struct nlattr **tb, char *ifname, int status)
1502 {
1503 const struct net_device_ops *ops = dev->netdev_ops;
1504 int err;
1505
1506 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1507 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1508 if (IS_ERR(net)) {
1509 err = PTR_ERR(net);
1510 goto errout;
1511 }
1512 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1513 put_net(net);
1514 err = -EPERM;
1515 goto errout;
1516 }
1517 err = dev_change_net_namespace(dev, net, ifname);
1518 put_net(net);
1519 if (err)
1520 goto errout;
1521 status |= DO_SETLINK_MODIFIED;
1522 }
1523
1524 if (tb[IFLA_MAP]) {
1525 struct rtnl_link_ifmap *u_map;
1526 struct ifmap k_map;
1527
1528 if (!ops->ndo_set_config) {
1529 err = -EOPNOTSUPP;
1530 goto errout;
1531 }
1532
1533 if (!netif_device_present(dev)) {
1534 err = -ENODEV;
1535 goto errout;
1536 }
1537
1538 u_map = nla_data(tb[IFLA_MAP]);
1539 k_map.mem_start = (unsigned long) u_map->mem_start;
1540 k_map.mem_end = (unsigned long) u_map->mem_end;
1541 k_map.base_addr = (unsigned short) u_map->base_addr;
1542 k_map.irq = (unsigned char) u_map->irq;
1543 k_map.dma = (unsigned char) u_map->dma;
1544 k_map.port = (unsigned char) u_map->port;
1545
1546 err = ops->ndo_set_config(dev, &k_map);
1547 if (err < 0)
1548 goto errout;
1549
1550 status |= DO_SETLINK_NOTIFY;
1551 }
1552
1553 if (tb[IFLA_ADDRESS]) {
1554 struct sockaddr *sa;
1555 int len;
1556
1557 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
1558 sizeof(*sa));
1559 sa = kmalloc(len, GFP_KERNEL);
1560 if (!sa) {
1561 err = -ENOMEM;
1562 goto errout;
1563 }
1564 sa->sa_family = dev->type;
1565 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1566 dev->addr_len);
1567 err = dev_set_mac_address(dev, sa);
1568 kfree(sa);
1569 if (err)
1570 goto errout;
1571 status |= DO_SETLINK_MODIFIED;
1572 }
1573
1574 if (tb[IFLA_MTU]) {
1575 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1576 if (err < 0)
1577 goto errout;
1578 status |= DO_SETLINK_MODIFIED;
1579 }
1580
1581 if (tb[IFLA_GROUP]) {
1582 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1583 status |= DO_SETLINK_NOTIFY;
1584 }
1585
1586 /*
1587 * Interface selected by interface index but interface
1588 * name provided implies that a name change has been
1589 * requested.
1590 */
1591 if (ifm->ifi_index > 0 && ifname[0]) {
1592 err = dev_change_name(dev, ifname);
1593 if (err < 0)
1594 goto errout;
1595 status |= DO_SETLINK_MODIFIED;
1596 }
1597
1598 if (tb[IFLA_IFALIAS]) {
1599 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1600 nla_len(tb[IFLA_IFALIAS]));
1601 if (err < 0)
1602 goto errout;
1603 status |= DO_SETLINK_NOTIFY;
1604 }
1605
1606 if (tb[IFLA_BROADCAST]) {
1607 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1608 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1609 }
1610
1611 if (ifm->ifi_flags || ifm->ifi_change) {
1612 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1613 if (err < 0)
1614 goto errout;
1615 }
1616
1617 if (tb[IFLA_MASTER]) {
1618 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1619 if (err)
1620 goto errout;
1621 status |= DO_SETLINK_MODIFIED;
1622 }
1623
1624 if (tb[IFLA_CARRIER]) {
1625 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1626 if (err)
1627 goto errout;
1628 status |= DO_SETLINK_MODIFIED;
1629 }
1630
1631 if (tb[IFLA_TXQLEN]) {
1632 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1633
1634 if (dev->tx_queue_len ^ value)
1635 status |= DO_SETLINK_NOTIFY;
1636
1637 dev->tx_queue_len = value;
1638 }
1639
1640 if (tb[IFLA_OPERSTATE])
1641 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1642
1643 if (tb[IFLA_LINKMODE]) {
1644 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1645
1646 write_lock_bh(&dev_base_lock);
1647 if (dev->link_mode ^ value)
1648 status |= DO_SETLINK_NOTIFY;
1649 dev->link_mode = value;
1650 write_unlock_bh(&dev_base_lock);
1651 }
1652
1653 if (tb[IFLA_VFINFO_LIST]) {
1654 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
1655 struct nlattr *attr;
1656 int rem;
1657
1658 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1659 if (nla_type(attr) != IFLA_VF_INFO ||
1660 nla_len(attr) < NLA_HDRLEN) {
1661 err = -EINVAL;
1662 goto errout;
1663 }
1664 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
1665 ifla_vf_policy);
1666 if (err < 0)
1667 goto errout;
1668 err = do_setvfinfo(dev, vfinfo);
1669 if (err < 0)
1670 goto errout;
1671 status |= DO_SETLINK_NOTIFY;
1672 }
1673 }
1674 err = 0;
1675
1676 if (tb[IFLA_VF_PORTS]) {
1677 struct nlattr *port[IFLA_PORT_MAX+1];
1678 struct nlattr *attr;
1679 int vf;
1680 int rem;
1681
1682 err = -EOPNOTSUPP;
1683 if (!ops->ndo_set_vf_port)
1684 goto errout;
1685
1686 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1687 if (nla_type(attr) != IFLA_VF_PORT)
1688 continue;
1689 err = nla_parse_nested(port, IFLA_PORT_MAX,
1690 attr, ifla_port_policy);
1691 if (err < 0)
1692 goto errout;
1693 if (!port[IFLA_PORT_VF]) {
1694 err = -EOPNOTSUPP;
1695 goto errout;
1696 }
1697 vf = nla_get_u32(port[IFLA_PORT_VF]);
1698 err = ops->ndo_set_vf_port(dev, vf, port);
1699 if (err < 0)
1700 goto errout;
1701 status |= DO_SETLINK_NOTIFY;
1702 }
1703 }
1704 err = 0;
1705
1706 if (tb[IFLA_PORT_SELF]) {
1707 struct nlattr *port[IFLA_PORT_MAX+1];
1708
1709 err = nla_parse_nested(port, IFLA_PORT_MAX,
1710 tb[IFLA_PORT_SELF], ifla_port_policy);
1711 if (err < 0)
1712 goto errout;
1713
1714 err = -EOPNOTSUPP;
1715 if (ops->ndo_set_vf_port)
1716 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1717 if (err < 0)
1718 goto errout;
1719 status |= DO_SETLINK_NOTIFY;
1720 }
1721
1722 if (tb[IFLA_AF_SPEC]) {
1723 struct nlattr *af;
1724 int rem;
1725
1726 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1727 const struct rtnl_af_ops *af_ops;
1728
1729 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1730 BUG();
1731
1732 err = af_ops->set_link_af(dev, af);
1733 if (err < 0)
1734 goto errout;
1735
1736 status |= DO_SETLINK_NOTIFY;
1737 }
1738 }
1739 err = 0;
1740
1741 errout:
1742 if (status & DO_SETLINK_MODIFIED) {
1743 if (status & DO_SETLINK_NOTIFY)
1744 netdev_state_change(dev);
1745
1746 if (err < 0)
1747 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",
1748 dev->name);
1749 }
1750
1751 return err;
1752 }
1753
rtnl_setlink(struct sk_buff * skb,struct nlmsghdr * nlh)1754 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1755 {
1756 struct net *net = sock_net(skb->sk);
1757 struct ifinfomsg *ifm;
1758 struct net_device *dev;
1759 int err;
1760 struct nlattr *tb[IFLA_MAX+1];
1761 char ifname[IFNAMSIZ];
1762
1763 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1764 if (err < 0)
1765 goto errout;
1766
1767 if (tb[IFLA_IFNAME])
1768 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1769 else
1770 ifname[0] = '\0';
1771
1772 err = -EINVAL;
1773 ifm = nlmsg_data(nlh);
1774 if (ifm->ifi_index > 0)
1775 dev = __dev_get_by_index(net, ifm->ifi_index);
1776 else if (tb[IFLA_IFNAME])
1777 dev = __dev_get_by_name(net, ifname);
1778 else
1779 goto errout;
1780
1781 if (dev == NULL) {
1782 err = -ENODEV;
1783 goto errout;
1784 }
1785
1786 err = validate_linkmsg(dev, tb);
1787 if (err < 0)
1788 goto errout;
1789
1790 err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1791 errout:
1792 return err;
1793 }
1794
rtnl_dellink(struct sk_buff * skb,struct nlmsghdr * nlh)1795 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1796 {
1797 struct net *net = sock_net(skb->sk);
1798 const struct rtnl_link_ops *ops;
1799 struct net_device *dev;
1800 struct ifinfomsg *ifm;
1801 char ifname[IFNAMSIZ];
1802 struct nlattr *tb[IFLA_MAX+1];
1803 int err;
1804 LIST_HEAD(list_kill);
1805
1806 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1807 if (err < 0)
1808 return err;
1809
1810 if (tb[IFLA_IFNAME])
1811 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1812
1813 ifm = nlmsg_data(nlh);
1814 if (ifm->ifi_index > 0)
1815 dev = __dev_get_by_index(net, ifm->ifi_index);
1816 else if (tb[IFLA_IFNAME])
1817 dev = __dev_get_by_name(net, ifname);
1818 else
1819 return -EINVAL;
1820
1821 if (!dev)
1822 return -ENODEV;
1823
1824 ops = dev->rtnl_link_ops;
1825 if (!ops || !ops->dellink)
1826 return -EOPNOTSUPP;
1827
1828 ops->dellink(dev, &list_kill);
1829 unregister_netdevice_many(&list_kill);
1830 return 0;
1831 }
1832
rtnl_configure_link(struct net_device * dev,const struct ifinfomsg * ifm)1833 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1834 {
1835 unsigned int old_flags;
1836 int err;
1837
1838 old_flags = dev->flags;
1839 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1840 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1841 if (err < 0)
1842 return err;
1843 }
1844
1845 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1846
1847 __dev_notify_flags(dev, old_flags, ~0U);
1848 return 0;
1849 }
1850 EXPORT_SYMBOL(rtnl_configure_link);
1851
rtnl_create_link(struct net * net,char * ifname,unsigned char name_assign_type,const struct rtnl_link_ops * ops,struct nlattr * tb[])1852 struct net_device *rtnl_create_link(struct net *net,
1853 char *ifname, unsigned char name_assign_type,
1854 const struct rtnl_link_ops *ops, struct nlattr *tb[])
1855 {
1856 int err;
1857 struct net_device *dev;
1858 unsigned int num_tx_queues = 1;
1859 unsigned int num_rx_queues = 1;
1860
1861 if (tb[IFLA_NUM_TX_QUEUES])
1862 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1863 else if (ops->get_num_tx_queues)
1864 num_tx_queues = ops->get_num_tx_queues();
1865
1866 if (tb[IFLA_NUM_RX_QUEUES])
1867 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1868 else if (ops->get_num_rx_queues)
1869 num_rx_queues = ops->get_num_rx_queues();
1870
1871 err = -ENOMEM;
1872 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
1873 ops->setup, num_tx_queues, num_rx_queues);
1874 if (!dev)
1875 goto err;
1876
1877 dev_net_set(dev, net);
1878 dev->rtnl_link_ops = ops;
1879 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1880
1881 if (tb[IFLA_MTU])
1882 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1883 if (tb[IFLA_ADDRESS]) {
1884 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1885 nla_len(tb[IFLA_ADDRESS]));
1886 dev->addr_assign_type = NET_ADDR_SET;
1887 }
1888 if (tb[IFLA_BROADCAST])
1889 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1890 nla_len(tb[IFLA_BROADCAST]));
1891 if (tb[IFLA_TXQLEN])
1892 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1893 if (tb[IFLA_OPERSTATE])
1894 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1895 if (tb[IFLA_LINKMODE])
1896 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1897 if (tb[IFLA_GROUP])
1898 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1899
1900 return dev;
1901
1902 err:
1903 return ERR_PTR(err);
1904 }
1905 EXPORT_SYMBOL(rtnl_create_link);
1906
rtnl_group_changelink(const struct sk_buff * skb,struct net * net,int group,struct ifinfomsg * ifm,struct nlattr ** tb)1907 static int rtnl_group_changelink(const struct sk_buff *skb,
1908 struct net *net, int group,
1909 struct ifinfomsg *ifm,
1910 struct nlattr **tb)
1911 {
1912 struct net_device *dev;
1913 int err;
1914
1915 for_each_netdev(net, dev) {
1916 if (dev->group == group) {
1917 err = do_setlink(skb, dev, ifm, tb, NULL, 0);
1918 if (err < 0)
1919 return err;
1920 }
1921 }
1922
1923 return 0;
1924 }
1925
rtnl_newlink(struct sk_buff * skb,struct nlmsghdr * nlh)1926 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1927 {
1928 struct net *net = sock_net(skb->sk);
1929 const struct rtnl_link_ops *ops;
1930 const struct rtnl_link_ops *m_ops = NULL;
1931 struct net_device *dev;
1932 struct net_device *master_dev = NULL;
1933 struct ifinfomsg *ifm;
1934 char kind[MODULE_NAME_LEN];
1935 char ifname[IFNAMSIZ];
1936 struct nlattr *tb[IFLA_MAX+1];
1937 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1938 unsigned char name_assign_type = NET_NAME_USER;
1939 int err;
1940
1941 #ifdef CONFIG_MODULES
1942 replay:
1943 #endif
1944 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1945 if (err < 0)
1946 return err;
1947
1948 if (tb[IFLA_IFNAME])
1949 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1950 else
1951 ifname[0] = '\0';
1952
1953 ifm = nlmsg_data(nlh);
1954 if (ifm->ifi_index > 0)
1955 dev = __dev_get_by_index(net, ifm->ifi_index);
1956 else {
1957 if (ifname[0])
1958 dev = __dev_get_by_name(net, ifname);
1959 else
1960 dev = NULL;
1961 }
1962
1963 if (dev) {
1964 master_dev = netdev_master_upper_dev_get(dev);
1965 if (master_dev)
1966 m_ops = master_dev->rtnl_link_ops;
1967 }
1968
1969 err = validate_linkmsg(dev, tb);
1970 if (err < 0)
1971 return err;
1972
1973 if (tb[IFLA_LINKINFO]) {
1974 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1975 tb[IFLA_LINKINFO], ifla_info_policy);
1976 if (err < 0)
1977 return err;
1978 } else
1979 memset(linkinfo, 0, sizeof(linkinfo));
1980
1981 if (linkinfo[IFLA_INFO_KIND]) {
1982 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1983 ops = rtnl_link_ops_get(kind);
1984 } else {
1985 kind[0] = '\0';
1986 ops = NULL;
1987 }
1988
1989 if (1) {
1990 struct nlattr *attr[ops ? ops->maxtype + 1 : 0];
1991 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 0];
1992 struct nlattr **data = NULL;
1993 struct nlattr **slave_data = NULL;
1994 struct net *dest_net;
1995
1996 if (ops) {
1997 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1998 err = nla_parse_nested(attr, ops->maxtype,
1999 linkinfo[IFLA_INFO_DATA],
2000 ops->policy);
2001 if (err < 0)
2002 return err;
2003 data = attr;
2004 }
2005 if (ops->validate) {
2006 err = ops->validate(tb, data);
2007 if (err < 0)
2008 return err;
2009 }
2010 }
2011
2012 if (m_ops) {
2013 if (m_ops->slave_maxtype &&
2014 linkinfo[IFLA_INFO_SLAVE_DATA]) {
2015 err = nla_parse_nested(slave_attr,
2016 m_ops->slave_maxtype,
2017 linkinfo[IFLA_INFO_SLAVE_DATA],
2018 m_ops->slave_policy);
2019 if (err < 0)
2020 return err;
2021 slave_data = slave_attr;
2022 }
2023 if (m_ops->slave_validate) {
2024 err = m_ops->slave_validate(tb, slave_data);
2025 if (err < 0)
2026 return err;
2027 }
2028 }
2029
2030 if (dev) {
2031 int status = 0;
2032
2033 if (nlh->nlmsg_flags & NLM_F_EXCL)
2034 return -EEXIST;
2035 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2036 return -EOPNOTSUPP;
2037
2038 if (linkinfo[IFLA_INFO_DATA]) {
2039 if (!ops || ops != dev->rtnl_link_ops ||
2040 !ops->changelink)
2041 return -EOPNOTSUPP;
2042
2043 err = ops->changelink(dev, tb, data);
2044 if (err < 0)
2045 return err;
2046 status |= DO_SETLINK_NOTIFY;
2047 }
2048
2049 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2050 if (!m_ops || !m_ops->slave_changelink)
2051 return -EOPNOTSUPP;
2052
2053 err = m_ops->slave_changelink(master_dev, dev,
2054 tb, slave_data);
2055 if (err < 0)
2056 return err;
2057 status |= DO_SETLINK_NOTIFY;
2058 }
2059
2060 return do_setlink(skb, dev, ifm, tb, ifname, status);
2061 }
2062
2063 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2064 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2065 return rtnl_group_changelink(skb, net,
2066 nla_get_u32(tb[IFLA_GROUP]),
2067 ifm, tb);
2068 return -ENODEV;
2069 }
2070
2071 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2072 return -EOPNOTSUPP;
2073
2074 if (!ops) {
2075 #ifdef CONFIG_MODULES
2076 if (kind[0]) {
2077 __rtnl_unlock();
2078 request_module("rtnl-link-%s", kind);
2079 rtnl_lock();
2080 ops = rtnl_link_ops_get(kind);
2081 if (ops)
2082 goto replay;
2083 }
2084 #endif
2085 return -EOPNOTSUPP;
2086 }
2087
2088 if (!ops->setup)
2089 return -EOPNOTSUPP;
2090
2091 if (!ifname[0]) {
2092 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2093 name_assign_type = NET_NAME_ENUM;
2094 }
2095
2096 dest_net = rtnl_link_get_net(net, tb);
2097 if (IS_ERR(dest_net))
2098 return PTR_ERR(dest_net);
2099
2100 dev = rtnl_create_link(dest_net, ifname, name_assign_type, ops, tb);
2101 if (IS_ERR(dev)) {
2102 err = PTR_ERR(dev);
2103 goto out;
2104 }
2105
2106 dev->ifindex = ifm->ifi_index;
2107
2108 if (ops->newlink) {
2109 err = ops->newlink(net, dev, tb, data);
2110 /* Drivers should call free_netdev() in ->destructor
2111 * and unregister it on failure after registration
2112 * so that device could be finally freed in rtnl_unlock.
2113 */
2114 if (err < 0) {
2115 /* If device is not registered at all, free it now */
2116 if (dev->reg_state == NETREG_UNINITIALIZED)
2117 free_netdev(dev);
2118 goto out;
2119 }
2120 } else {
2121 err = register_netdevice(dev);
2122 if (err < 0) {
2123 free_netdev(dev);
2124 goto out;
2125 }
2126 }
2127 err = rtnl_configure_link(dev, ifm);
2128 if (err < 0) {
2129 if (ops->newlink) {
2130 LIST_HEAD(list_kill);
2131
2132 ops->dellink(dev, &list_kill);
2133 unregister_netdevice_many(&list_kill);
2134 } else {
2135 unregister_netdevice(dev);
2136 }
2137 }
2138 out:
2139 put_net(dest_net);
2140 return err;
2141 }
2142 }
2143
rtnl_getlink(struct sk_buff * skb,struct nlmsghdr * nlh)2144 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2145 {
2146 struct net *net = sock_net(skb->sk);
2147 struct ifinfomsg *ifm;
2148 char ifname[IFNAMSIZ];
2149 struct nlattr *tb[IFLA_MAX+1];
2150 struct net_device *dev = NULL;
2151 struct sk_buff *nskb;
2152 int err;
2153 u32 ext_filter_mask = 0;
2154
2155 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2156 if (err < 0)
2157 return err;
2158
2159 if (tb[IFLA_IFNAME])
2160 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2161
2162 if (tb[IFLA_EXT_MASK])
2163 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2164
2165 ifm = nlmsg_data(nlh);
2166 if (ifm->ifi_index > 0)
2167 dev = __dev_get_by_index(net, ifm->ifi_index);
2168 else if (tb[IFLA_IFNAME])
2169 dev = __dev_get_by_name(net, ifname);
2170 else
2171 return -EINVAL;
2172
2173 if (dev == NULL)
2174 return -ENODEV;
2175
2176 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2177 if (nskb == NULL)
2178 return -ENOBUFS;
2179
2180 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2181 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2182 if (err < 0) {
2183 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2184 WARN_ON(err == -EMSGSIZE);
2185 kfree_skb(nskb);
2186 } else
2187 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2188
2189 return err;
2190 }
2191
rtnl_calcit(struct sk_buff * skb,struct nlmsghdr * nlh)2192 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2193 {
2194 struct net *net = sock_net(skb->sk);
2195 struct net_device *dev;
2196 struct nlattr *tb[IFLA_MAX+1];
2197 u32 ext_filter_mask = 0;
2198 u16 min_ifinfo_dump_size = 0;
2199 int hdrlen;
2200
2201 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2202 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2203 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2204
2205 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2206 if (tb[IFLA_EXT_MASK])
2207 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2208 }
2209
2210 if (!ext_filter_mask)
2211 return NLMSG_GOODSIZE;
2212 /*
2213 * traverse the list of net devices and compute the minimum
2214 * buffer size based upon the filter mask.
2215 */
2216 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2217 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2218 if_nlmsg_size(dev,
2219 ext_filter_mask));
2220 }
2221
2222 return min_ifinfo_dump_size;
2223 }
2224
rtnl_dump_all(struct sk_buff * skb,struct netlink_callback * cb)2225 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2226 {
2227 int idx;
2228 int s_idx = cb->family;
2229
2230 if (s_idx == 0)
2231 s_idx = 1;
2232 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2233 int type = cb->nlh->nlmsg_type-RTM_BASE;
2234 if (idx < s_idx || idx == PF_PACKET)
2235 continue;
2236 if (rtnl_msg_handlers[idx] == NULL ||
2237 rtnl_msg_handlers[idx][type].dumpit == NULL)
2238 continue;
2239 if (idx > s_idx) {
2240 memset(&cb->args[0], 0, sizeof(cb->args));
2241 cb->prev_seq = 0;
2242 cb->seq = 0;
2243 }
2244 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2245 break;
2246 }
2247 cb->family = idx;
2248
2249 return skb->len;
2250 }
2251
rtmsg_ifinfo(int type,struct net_device * dev,unsigned int change,gfp_t flags)2252 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2253 gfp_t flags)
2254 {
2255 struct net *net = dev_net(dev);
2256 struct sk_buff *skb;
2257 int err = -ENOBUFS;
2258 size_t if_info_size;
2259
2260 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2261 if (skb == NULL)
2262 goto errout;
2263
2264 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2265 if (err < 0) {
2266 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2267 WARN_ON(err == -EMSGSIZE);
2268 kfree_skb(skb);
2269 goto errout;
2270 }
2271 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2272 return;
2273 errout:
2274 if (err < 0)
2275 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2276 }
2277 EXPORT_SYMBOL(rtmsg_ifinfo);
2278
nlmsg_populate_fdb_fill(struct sk_buff * skb,struct net_device * dev,u8 * addr,u32 pid,u32 seq,int type,unsigned int flags,int nlflags)2279 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2280 struct net_device *dev,
2281 u8 *addr, u32 pid, u32 seq,
2282 int type, unsigned int flags,
2283 int nlflags)
2284 {
2285 struct nlmsghdr *nlh;
2286 struct ndmsg *ndm;
2287
2288 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2289 if (!nlh)
2290 return -EMSGSIZE;
2291
2292 ndm = nlmsg_data(nlh);
2293 ndm->ndm_family = AF_BRIDGE;
2294 ndm->ndm_pad1 = 0;
2295 ndm->ndm_pad2 = 0;
2296 ndm->ndm_flags = flags;
2297 ndm->ndm_type = 0;
2298 ndm->ndm_ifindex = dev->ifindex;
2299 ndm->ndm_state = NUD_PERMANENT;
2300
2301 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2302 goto nla_put_failure;
2303
2304 return nlmsg_end(skb, nlh);
2305
2306 nla_put_failure:
2307 nlmsg_cancel(skb, nlh);
2308 return -EMSGSIZE;
2309 }
2310
rtnl_fdb_nlmsg_size(void)2311 static inline size_t rtnl_fdb_nlmsg_size(void)
2312 {
2313 return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2314 }
2315
rtnl_fdb_notify(struct net_device * dev,u8 * addr,int type)2316 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2317 {
2318 struct net *net = dev_net(dev);
2319 struct sk_buff *skb;
2320 int err = -ENOBUFS;
2321
2322 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2323 if (!skb)
2324 goto errout;
2325
2326 err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0);
2327 if (err < 0) {
2328 kfree_skb(skb);
2329 goto errout;
2330 }
2331
2332 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2333 return;
2334 errout:
2335 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2336 }
2337
2338 /**
2339 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2340 */
ndo_dflt_fdb_add(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 flags)2341 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2342 struct nlattr *tb[],
2343 struct net_device *dev,
2344 const unsigned char *addr,
2345 u16 flags)
2346 {
2347 int err = -EINVAL;
2348
2349 /* If aging addresses are supported device will need to
2350 * implement its own handler for this.
2351 */
2352 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2353 pr_info("%s: FDB only supports static addresses\n", dev->name);
2354 return err;
2355 }
2356
2357 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2358 err = dev_uc_add_excl(dev, addr);
2359 else if (is_multicast_ether_addr(addr))
2360 err = dev_mc_add_excl(dev, addr);
2361
2362 /* Only return duplicate errors if NLM_F_EXCL is set */
2363 if (err == -EEXIST && !(flags & NLM_F_EXCL))
2364 err = 0;
2365
2366 return err;
2367 }
2368 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2369
rtnl_fdb_add(struct sk_buff * skb,struct nlmsghdr * nlh)2370 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2371 {
2372 struct net *net = sock_net(skb->sk);
2373 struct ndmsg *ndm;
2374 struct nlattr *tb[NDA_MAX+1];
2375 struct net_device *dev;
2376 u8 *addr;
2377 int err;
2378
2379 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2380 if (err < 0)
2381 return err;
2382
2383 ndm = nlmsg_data(nlh);
2384 if (ndm->ndm_ifindex == 0) {
2385 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2386 return -EINVAL;
2387 }
2388
2389 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2390 if (dev == NULL) {
2391 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2392 return -ENODEV;
2393 }
2394
2395 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2396 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2397 return -EINVAL;
2398 }
2399
2400 addr = nla_data(tb[NDA_LLADDR]);
2401
2402 err = -EOPNOTSUPP;
2403
2404 /* Support fdb on master device the net/bridge default case */
2405 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2406 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2407 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2408 const struct net_device_ops *ops = br_dev->netdev_ops;
2409
2410 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2411 if (err)
2412 goto out;
2413 else
2414 ndm->ndm_flags &= ~NTF_MASTER;
2415 }
2416
2417 /* Embedded bridge, macvlan, and any other device support */
2418 if ((ndm->ndm_flags & NTF_SELF)) {
2419 if (dev->netdev_ops->ndo_fdb_add)
2420 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2421 nlh->nlmsg_flags);
2422 else
2423 err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2424 nlh->nlmsg_flags);
2425
2426 if (!err) {
2427 rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2428 ndm->ndm_flags &= ~NTF_SELF;
2429 }
2430 }
2431 out:
2432 return err;
2433 }
2434
2435 /**
2436 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2437 */
ndo_dflt_fdb_del(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr)2438 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2439 struct nlattr *tb[],
2440 struct net_device *dev,
2441 const unsigned char *addr)
2442 {
2443 int err = -EINVAL;
2444
2445 /* If aging addresses are supported device will need to
2446 * implement its own handler for this.
2447 */
2448 if (!(ndm->ndm_state & NUD_PERMANENT)) {
2449 pr_info("%s: FDB only supports static addresses\n", dev->name);
2450 return err;
2451 }
2452
2453 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2454 err = dev_uc_del(dev, addr);
2455 else if (is_multicast_ether_addr(addr))
2456 err = dev_mc_del(dev, addr);
2457
2458 return err;
2459 }
2460 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2461
rtnl_fdb_del(struct sk_buff * skb,struct nlmsghdr * nlh)2462 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2463 {
2464 struct net *net = sock_net(skb->sk);
2465 struct ndmsg *ndm;
2466 struct nlattr *tb[NDA_MAX+1];
2467 struct net_device *dev;
2468 int err = -EINVAL;
2469 __u8 *addr;
2470
2471 if (!netlink_capable(skb, CAP_NET_ADMIN))
2472 return -EPERM;
2473
2474 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2475 if (err < 0)
2476 return err;
2477
2478 ndm = nlmsg_data(nlh);
2479 if (ndm->ndm_ifindex == 0) {
2480 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2481 return -EINVAL;
2482 }
2483
2484 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2485 if (dev == NULL) {
2486 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2487 return -ENODEV;
2488 }
2489
2490 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2491 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2492 return -EINVAL;
2493 }
2494
2495 addr = nla_data(tb[NDA_LLADDR]);
2496
2497 err = -EOPNOTSUPP;
2498
2499 /* Support fdb on master device the net/bridge default case */
2500 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2501 (dev->priv_flags & IFF_BRIDGE_PORT)) {
2502 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2503 const struct net_device_ops *ops = br_dev->netdev_ops;
2504
2505 if (ops->ndo_fdb_del)
2506 err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2507
2508 if (err)
2509 goto out;
2510 else
2511 ndm->ndm_flags &= ~NTF_MASTER;
2512 }
2513
2514 /* Embedded bridge, macvlan, and any other device support */
2515 if (ndm->ndm_flags & NTF_SELF) {
2516 if (dev->netdev_ops->ndo_fdb_del)
2517 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2518 else
2519 err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2520
2521 if (!err) {
2522 rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2523 ndm->ndm_flags &= ~NTF_SELF;
2524 }
2525 }
2526 out:
2527 return err;
2528 }
2529
nlmsg_populate_fdb(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev,int * idx,struct netdev_hw_addr_list * list)2530 static int nlmsg_populate_fdb(struct sk_buff *skb,
2531 struct netlink_callback *cb,
2532 struct net_device *dev,
2533 int *idx,
2534 struct netdev_hw_addr_list *list)
2535 {
2536 struct netdev_hw_addr *ha;
2537 int err;
2538 u32 portid, seq;
2539
2540 portid = NETLINK_CB(cb->skb).portid;
2541 seq = cb->nlh->nlmsg_seq;
2542
2543 list_for_each_entry(ha, &list->list, list) {
2544 if (*idx < cb->args[0])
2545 goto skip;
2546
2547 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2548 portid, seq,
2549 RTM_NEWNEIGH, NTF_SELF,
2550 NLM_F_MULTI);
2551 if (err < 0)
2552 return err;
2553 skip:
2554 *idx += 1;
2555 }
2556 return 0;
2557 }
2558
2559 /**
2560 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2561 * @nlh: netlink message header
2562 * @dev: netdevice
2563 *
2564 * Default netdevice operation to dump the existing unicast address list.
2565 * Returns number of addresses from list put in skb.
2566 */
ndo_dflt_fdb_dump(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev,struct net_device * filter_dev,int idx)2567 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2568 struct netlink_callback *cb,
2569 struct net_device *dev,
2570 struct net_device *filter_dev,
2571 int idx)
2572 {
2573 int err;
2574
2575 netif_addr_lock_bh(dev);
2576 err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2577 if (err)
2578 goto out;
2579 nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2580 out:
2581 netif_addr_unlock_bh(dev);
2582 return idx;
2583 }
2584 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2585
rtnl_fdb_dump(struct sk_buff * skb,struct netlink_callback * cb)2586 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2587 {
2588 struct net_device *dev;
2589 struct nlattr *tb[IFLA_MAX+1];
2590 struct net_device *bdev = NULL;
2591 struct net_device *br_dev = NULL;
2592 const struct net_device_ops *ops = NULL;
2593 const struct net_device_ops *cops = NULL;
2594 struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2595 struct net *net = sock_net(skb->sk);
2596 int brport_idx = 0;
2597 int br_idx = 0;
2598 int idx = 0;
2599
2600 if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2601 ifla_policy) == 0) {
2602 if (tb[IFLA_MASTER])
2603 br_idx = nla_get_u32(tb[IFLA_MASTER]);
2604 }
2605
2606 brport_idx = ifm->ifi_index;
2607
2608 if (br_idx) {
2609 br_dev = __dev_get_by_index(net, br_idx);
2610 if (!br_dev)
2611 return -ENODEV;
2612
2613 ops = br_dev->netdev_ops;
2614 bdev = br_dev;
2615 }
2616
2617 for_each_netdev(net, dev) {
2618 if (brport_idx && (dev->ifindex != brport_idx))
2619 continue;
2620
2621 if (!br_idx) { /* user did not specify a specific bridge */
2622 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2623 br_dev = netdev_master_upper_dev_get(dev);
2624 cops = br_dev->netdev_ops;
2625 }
2626
2627 bdev = dev;
2628 } else {
2629 if (dev != br_dev &&
2630 !(dev->priv_flags & IFF_BRIDGE_PORT))
2631 continue;
2632
2633 if (br_dev != netdev_master_upper_dev_get(dev) &&
2634 !(dev->priv_flags & IFF_EBRIDGE))
2635 continue;
2636
2637 bdev = br_dev;
2638 cops = ops;
2639 }
2640
2641 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2642 if (cops && cops->ndo_fdb_dump)
2643 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2644 idx);
2645 }
2646
2647 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2648 if (dev->netdev_ops->ndo_fdb_dump)
2649 idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, bdev, dev,
2650 idx);
2651
2652 cops = NULL;
2653 }
2654
2655 cb->args[0] = idx;
2656 return skb->len;
2657 }
2658
ndo_dflt_bridge_getlink(struct sk_buff * skb,u32 pid,u32 seq,struct net_device * dev,u16 mode)2659 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2660 struct net_device *dev, u16 mode)
2661 {
2662 struct nlmsghdr *nlh;
2663 struct ifinfomsg *ifm;
2664 struct nlattr *br_afspec;
2665 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2666 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2667
2668 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2669 if (nlh == NULL)
2670 return -EMSGSIZE;
2671
2672 ifm = nlmsg_data(nlh);
2673 ifm->ifi_family = AF_BRIDGE;
2674 ifm->__ifi_pad = 0;
2675 ifm->ifi_type = dev->type;
2676 ifm->ifi_index = dev->ifindex;
2677 ifm->ifi_flags = dev_get_flags(dev);
2678 ifm->ifi_change = 0;
2679
2680
2681 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2682 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2683 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2684 (br_dev &&
2685 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2686 (dev->addr_len &&
2687 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2688 (dev->ifindex != dev->iflink &&
2689 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2690 goto nla_put_failure;
2691
2692 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2693 if (!br_afspec)
2694 goto nla_put_failure;
2695
2696 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2697 nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2698 nla_nest_cancel(skb, br_afspec);
2699 goto nla_put_failure;
2700 }
2701 nla_nest_end(skb, br_afspec);
2702
2703 return nlmsg_end(skb, nlh);
2704 nla_put_failure:
2705 nlmsg_cancel(skb, nlh);
2706 return -EMSGSIZE;
2707 }
2708 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2709
rtnl_bridge_getlink(struct sk_buff * skb,struct netlink_callback * cb)2710 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2711 {
2712 struct net *net = sock_net(skb->sk);
2713 struct net_device *dev;
2714 int idx = 0;
2715 u32 portid = NETLINK_CB(cb->skb).portid;
2716 u32 seq = cb->nlh->nlmsg_seq;
2717 u32 filter_mask = 0;
2718
2719 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
2720 struct nlattr *extfilt;
2721
2722 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2723 IFLA_EXT_MASK);
2724 if (extfilt) {
2725 if (nla_len(extfilt) < sizeof(filter_mask))
2726 return -EINVAL;
2727
2728 filter_mask = nla_get_u32(extfilt);
2729 }
2730 }
2731
2732 rcu_read_lock();
2733 for_each_netdev_rcu(net, dev) {
2734 const struct net_device_ops *ops = dev->netdev_ops;
2735 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2736
2737 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2738 if (idx >= cb->args[0] &&
2739 br_dev->netdev_ops->ndo_bridge_getlink(
2740 skb, portid, seq, dev, filter_mask) < 0)
2741 break;
2742 idx++;
2743 }
2744
2745 if (ops->ndo_bridge_getlink) {
2746 if (idx >= cb->args[0] &&
2747 ops->ndo_bridge_getlink(skb, portid, seq, dev,
2748 filter_mask) < 0)
2749 break;
2750 idx++;
2751 }
2752 }
2753 rcu_read_unlock();
2754 cb->args[0] = idx;
2755
2756 return skb->len;
2757 }
2758
bridge_nlmsg_size(void)2759 static inline size_t bridge_nlmsg_size(void)
2760 {
2761 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2762 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
2763 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
2764 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
2765 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
2766 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
2767 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
2768 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
2769 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2770 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
2771 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
2772 }
2773
rtnl_bridge_notify(struct net_device * dev,u16 flags)2774 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2775 {
2776 struct net *net = dev_net(dev);
2777 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2778 struct sk_buff *skb;
2779 int err = -EOPNOTSUPP;
2780
2781 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2782 if (!skb) {
2783 err = -ENOMEM;
2784 goto errout;
2785 }
2786
2787 if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2788 br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2789 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2790 if (err < 0)
2791 goto errout;
2792 }
2793
2794 if ((flags & BRIDGE_FLAGS_SELF) &&
2795 dev->netdev_ops->ndo_bridge_getlink) {
2796 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2797 if (err < 0)
2798 goto errout;
2799 }
2800
2801 if (!skb->len)
2802 goto errout;
2803
2804 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2805 return 0;
2806 errout:
2807 WARN_ON(err == -EMSGSIZE);
2808 kfree_skb(skb);
2809 if (err)
2810 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2811 return err;
2812 }
2813
rtnl_bridge_setlink(struct sk_buff * skb,struct nlmsghdr * nlh)2814 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2815 {
2816 struct net *net = sock_net(skb->sk);
2817 struct ifinfomsg *ifm;
2818 struct net_device *dev;
2819 struct nlattr *br_spec, *attr = NULL;
2820 int rem, err = -EOPNOTSUPP;
2821 u16 oflags, flags = 0;
2822 bool have_flags = false;
2823
2824 if (nlmsg_len(nlh) < sizeof(*ifm))
2825 return -EINVAL;
2826
2827 ifm = nlmsg_data(nlh);
2828 if (ifm->ifi_family != AF_BRIDGE)
2829 return -EPFNOSUPPORT;
2830
2831 dev = __dev_get_by_index(net, ifm->ifi_index);
2832 if (!dev) {
2833 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2834 return -ENODEV;
2835 }
2836
2837 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2838 if (br_spec) {
2839 nla_for_each_nested(attr, br_spec, rem) {
2840 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2841 if (nla_len(attr) < sizeof(flags))
2842 return -EINVAL;
2843
2844 have_flags = true;
2845 flags = nla_get_u16(attr);
2846 break;
2847 }
2848 }
2849 }
2850
2851 oflags = flags;
2852
2853 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2854 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2855
2856 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2857 err = -EOPNOTSUPP;
2858 goto out;
2859 }
2860
2861 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2862 if (err)
2863 goto out;
2864
2865 flags &= ~BRIDGE_FLAGS_MASTER;
2866 }
2867
2868 if ((flags & BRIDGE_FLAGS_SELF)) {
2869 if (!dev->netdev_ops->ndo_bridge_setlink)
2870 err = -EOPNOTSUPP;
2871 else
2872 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2873
2874 if (!err)
2875 flags &= ~BRIDGE_FLAGS_SELF;
2876 }
2877
2878 if (have_flags)
2879 memcpy(nla_data(attr), &flags, sizeof(flags));
2880 /* Generate event to notify upper layer of bridge change */
2881 if (!err)
2882 err = rtnl_bridge_notify(dev, oflags);
2883 out:
2884 return err;
2885 }
2886
rtnl_bridge_dellink(struct sk_buff * skb,struct nlmsghdr * nlh)2887 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2888 {
2889 struct net *net = sock_net(skb->sk);
2890 struct ifinfomsg *ifm;
2891 struct net_device *dev;
2892 struct nlattr *br_spec, *attr = NULL;
2893 int rem, err = -EOPNOTSUPP;
2894 u16 oflags, flags = 0;
2895 bool have_flags = false;
2896
2897 if (nlmsg_len(nlh) < sizeof(*ifm))
2898 return -EINVAL;
2899
2900 ifm = nlmsg_data(nlh);
2901 if (ifm->ifi_family != AF_BRIDGE)
2902 return -EPFNOSUPPORT;
2903
2904 dev = __dev_get_by_index(net, ifm->ifi_index);
2905 if (!dev) {
2906 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2907 return -ENODEV;
2908 }
2909
2910 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2911 if (br_spec) {
2912 nla_for_each_nested(attr, br_spec, rem) {
2913 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2914 if (nla_len(attr) < sizeof(flags))
2915 return -EINVAL;
2916
2917 have_flags = true;
2918 flags = nla_get_u16(attr);
2919 break;
2920 }
2921 }
2922 }
2923
2924 oflags = flags;
2925
2926 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2927 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2928
2929 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2930 err = -EOPNOTSUPP;
2931 goto out;
2932 }
2933
2934 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2935 if (err)
2936 goto out;
2937
2938 flags &= ~BRIDGE_FLAGS_MASTER;
2939 }
2940
2941 if ((flags & BRIDGE_FLAGS_SELF)) {
2942 if (!dev->netdev_ops->ndo_bridge_dellink)
2943 err = -EOPNOTSUPP;
2944 else
2945 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2946
2947 if (!err)
2948 flags &= ~BRIDGE_FLAGS_SELF;
2949 }
2950
2951 if (have_flags)
2952 memcpy(nla_data(attr), &flags, sizeof(flags));
2953 /* Generate event to notify upper layer of bridge change */
2954 if (!err)
2955 err = rtnl_bridge_notify(dev, oflags);
2956 out:
2957 return err;
2958 }
2959
2960 /* Process one rtnetlink message. */
2961
rtnetlink_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh)2962 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2963 {
2964 struct net *net = sock_net(skb->sk);
2965 rtnl_doit_func doit;
2966 int sz_idx, kind;
2967 int family;
2968 int type;
2969 int err;
2970
2971 type = nlh->nlmsg_type;
2972 if (type > RTM_MAX)
2973 return -EOPNOTSUPP;
2974
2975 type -= RTM_BASE;
2976
2977 /* All the messages must have at least 1 byte length */
2978 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2979 return 0;
2980
2981 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2982 sz_idx = type>>2;
2983 kind = type&3;
2984
2985 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
2986 return -EPERM;
2987
2988 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2989 struct sock *rtnl;
2990 rtnl_dumpit_func dumpit;
2991 rtnl_calcit_func calcit;
2992 u16 min_dump_alloc = 0;
2993
2994 dumpit = rtnl_get_dumpit(family, type);
2995 if (dumpit == NULL)
2996 return -EOPNOTSUPP;
2997 calcit = rtnl_get_calcit(family, type);
2998 if (calcit)
2999 min_dump_alloc = calcit(skb, nlh);
3000
3001 __rtnl_unlock();
3002 rtnl = net->rtnl;
3003 {
3004 struct netlink_dump_control c = {
3005 .dump = dumpit,
3006 .min_dump_alloc = min_dump_alloc,
3007 };
3008 err = netlink_dump_start(rtnl, skb, nlh, &c);
3009 }
3010 rtnl_lock();
3011 return err;
3012 }
3013
3014 doit = rtnl_get_doit(family, type);
3015 if (doit == NULL)
3016 return -EOPNOTSUPP;
3017
3018 return doit(skb, nlh);
3019 }
3020
rtnetlink_rcv(struct sk_buff * skb)3021 static void rtnetlink_rcv(struct sk_buff *skb)
3022 {
3023 rtnl_lock();
3024 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3025 rtnl_unlock();
3026 }
3027
rtnetlink_event(struct notifier_block * this,unsigned long event,void * ptr)3028 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3029 {
3030 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3031
3032 switch (event) {
3033 case NETDEV_UP:
3034 case NETDEV_DOWN:
3035 case NETDEV_PRE_UP:
3036 case NETDEV_POST_INIT:
3037 case NETDEV_REGISTER:
3038 case NETDEV_CHANGE:
3039 case NETDEV_PRE_TYPE_CHANGE:
3040 case NETDEV_GOING_DOWN:
3041 case NETDEV_UNREGISTER:
3042 case NETDEV_UNREGISTER_FINAL:
3043 case NETDEV_RELEASE:
3044 case NETDEV_JOIN:
3045 break;
3046 default:
3047 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3048 break;
3049 }
3050 return NOTIFY_DONE;
3051 }
3052
3053 static struct notifier_block rtnetlink_dev_notifier = {
3054 .notifier_call = rtnetlink_event,
3055 };
3056
3057
rtnetlink_net_init(struct net * net)3058 static int __net_init rtnetlink_net_init(struct net *net)
3059 {
3060 struct sock *sk;
3061 struct netlink_kernel_cfg cfg = {
3062 .groups = RTNLGRP_MAX,
3063 .input = rtnetlink_rcv,
3064 .cb_mutex = &rtnl_mutex,
3065 .flags = NL_CFG_F_NONROOT_RECV,
3066 };
3067
3068 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3069 if (!sk)
3070 return -ENOMEM;
3071 net->rtnl = sk;
3072 return 0;
3073 }
3074
rtnetlink_net_exit(struct net * net)3075 static void __net_exit rtnetlink_net_exit(struct net *net)
3076 {
3077 netlink_kernel_release(net->rtnl);
3078 net->rtnl = NULL;
3079 }
3080
3081 static struct pernet_operations rtnetlink_net_ops = {
3082 .init = rtnetlink_net_init,
3083 .exit = rtnetlink_net_exit,
3084 };
3085
rtnetlink_init(void)3086 void __init rtnetlink_init(void)
3087 {
3088 if (register_pernet_subsys(&rtnetlink_net_ops))
3089 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3090
3091 register_netdevice_notifier(&rtnetlink_dev_notifier);
3092
3093 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3094 rtnl_dump_ifinfo, rtnl_calcit);
3095 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3096 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3097 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3098
3099 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3100 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3101
3102 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3103 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3104 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3105
3106 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3107 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3108 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3109 }
3110
3111