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Merge branch 'for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping
[mirror_ubuntu-bionic-kernel.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/pci.h>
39
40 #include <asm/uaccess.h>
41
42 #include <linux/inet.h>
43 #include <linux/netdevice.h>
44 #include <net/ip.h>
45 #include <net/protocol.h>
46 #include <net/arp.h>
47 #include <net/route.h>
48 #include <net/udp.h>
49 #include <net/sock.h>
50 #include <net/pkt_sched.h>
51 #include <net/fib_rules.h>
52 #include <net/rtnetlink.h>
53 #include <net/net_namespace.h>
54
55 struct rtnl_link {
56 rtnl_doit_func doit;
57 rtnl_dumpit_func dumpit;
58 rtnl_calcit_func calcit;
59 };
60
61 static DEFINE_MUTEX(rtnl_mutex);
62
63 void rtnl_lock(void)
64 {
65 mutex_lock(&rtnl_mutex);
66 }
67 EXPORT_SYMBOL(rtnl_lock);
68
69 void __rtnl_unlock(void)
70 {
71 mutex_unlock(&rtnl_mutex);
72 }
73
74 void rtnl_unlock(void)
75 {
76 /* This fellow will unlock it for us. */
77 netdev_run_todo();
78 }
79 EXPORT_SYMBOL(rtnl_unlock);
80
81 int rtnl_trylock(void)
82 {
83 return mutex_trylock(&rtnl_mutex);
84 }
85 EXPORT_SYMBOL(rtnl_trylock);
86
87 int rtnl_is_locked(void)
88 {
89 return mutex_is_locked(&rtnl_mutex);
90 }
91 EXPORT_SYMBOL(rtnl_is_locked);
92
93 #ifdef CONFIG_PROVE_LOCKING
94 int lockdep_rtnl_is_held(void)
95 {
96 return lockdep_is_held(&rtnl_mutex);
97 }
98 EXPORT_SYMBOL(lockdep_rtnl_is_held);
99 #endif /* #ifdef CONFIG_PROVE_LOCKING */
100
101 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
102
103 static inline int rtm_msgindex(int msgtype)
104 {
105 int msgindex = msgtype - RTM_BASE;
106
107 /*
108 * msgindex < 0 implies someone tried to register a netlink
109 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
110 * the message type has not been added to linux/rtnetlink.h
111 */
112 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
113
114 return msgindex;
115 }
116
117 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
118 {
119 struct rtnl_link *tab;
120
121 if (protocol <= RTNL_FAMILY_MAX)
122 tab = rtnl_msg_handlers[protocol];
123 else
124 tab = NULL;
125
126 if (tab == NULL || tab[msgindex].doit == NULL)
127 tab = rtnl_msg_handlers[PF_UNSPEC];
128
129 return tab ? tab[msgindex].doit : NULL;
130 }
131
132 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
133 {
134 struct rtnl_link *tab;
135
136 if (protocol <= RTNL_FAMILY_MAX)
137 tab = rtnl_msg_handlers[protocol];
138 else
139 tab = NULL;
140
141 if (tab == NULL || tab[msgindex].dumpit == NULL)
142 tab = rtnl_msg_handlers[PF_UNSPEC];
143
144 return tab ? tab[msgindex].dumpit : NULL;
145 }
146
147 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
148 {
149 struct rtnl_link *tab;
150
151 if (protocol <= RTNL_FAMILY_MAX)
152 tab = rtnl_msg_handlers[protocol];
153 else
154 tab = NULL;
155
156 if (tab == NULL || tab[msgindex].calcit == NULL)
157 tab = rtnl_msg_handlers[PF_UNSPEC];
158
159 return tab ? tab[msgindex].calcit : NULL;
160 }
161
162 /**
163 * __rtnl_register - Register a rtnetlink message type
164 * @protocol: Protocol family or PF_UNSPEC
165 * @msgtype: rtnetlink message type
166 * @doit: Function pointer called for each request message
167 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
168 * @calcit: Function pointer to calc size of dump message
169 *
170 * Registers the specified function pointers (at least one of them has
171 * to be non-NULL) to be called whenever a request message for the
172 * specified protocol family and message type is received.
173 *
174 * The special protocol family PF_UNSPEC may be used to define fallback
175 * function pointers for the case when no entry for the specific protocol
176 * family exists.
177 *
178 * Returns 0 on success or a negative error code.
179 */
180 int __rtnl_register(int protocol, int msgtype,
181 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
182 rtnl_calcit_func calcit)
183 {
184 struct rtnl_link *tab;
185 int msgindex;
186
187 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
188 msgindex = rtm_msgindex(msgtype);
189
190 tab = rtnl_msg_handlers[protocol];
191 if (tab == NULL) {
192 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
193 if (tab == NULL)
194 return -ENOBUFS;
195
196 rtnl_msg_handlers[protocol] = tab;
197 }
198
199 if (doit)
200 tab[msgindex].doit = doit;
201
202 if (dumpit)
203 tab[msgindex].dumpit = dumpit;
204
205 if (calcit)
206 tab[msgindex].calcit = calcit;
207
208 return 0;
209 }
210 EXPORT_SYMBOL_GPL(__rtnl_register);
211
212 /**
213 * rtnl_register - Register a rtnetlink message type
214 *
215 * Identical to __rtnl_register() but panics on failure. This is useful
216 * as failure of this function is very unlikely, it can only happen due
217 * to lack of memory when allocating the chain to store all message
218 * handlers for a protocol. Meant for use in init functions where lack
219 * of memory implies no sense in continuing.
220 */
221 void rtnl_register(int protocol, int msgtype,
222 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
223 rtnl_calcit_func calcit)
224 {
225 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
226 panic("Unable to register rtnetlink message handler, "
227 "protocol = %d, message type = %d\n",
228 protocol, msgtype);
229 }
230 EXPORT_SYMBOL_GPL(rtnl_register);
231
232 /**
233 * rtnl_unregister - Unregister a rtnetlink message type
234 * @protocol: Protocol family or PF_UNSPEC
235 * @msgtype: rtnetlink message type
236 *
237 * Returns 0 on success or a negative error code.
238 */
239 int rtnl_unregister(int protocol, int msgtype)
240 {
241 int msgindex;
242
243 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
244 msgindex = rtm_msgindex(msgtype);
245
246 if (rtnl_msg_handlers[protocol] == NULL)
247 return -ENOENT;
248
249 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
250 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
251
252 return 0;
253 }
254 EXPORT_SYMBOL_GPL(rtnl_unregister);
255
256 /**
257 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
258 * @protocol : Protocol family or PF_UNSPEC
259 *
260 * Identical to calling rtnl_unregster() for all registered message types
261 * of a certain protocol family.
262 */
263 void rtnl_unregister_all(int protocol)
264 {
265 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
266
267 kfree(rtnl_msg_handlers[protocol]);
268 rtnl_msg_handlers[protocol] = NULL;
269 }
270 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
271
272 static LIST_HEAD(link_ops);
273
274 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
275 {
276 const struct rtnl_link_ops *ops;
277
278 list_for_each_entry(ops, &link_ops, list) {
279 if (!strcmp(ops->kind, kind))
280 return ops;
281 }
282 return NULL;
283 }
284
285 /**
286 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
287 * @ops: struct rtnl_link_ops * to register
288 *
289 * The caller must hold the rtnl_mutex. This function should be used
290 * by drivers that create devices during module initialization. It
291 * must be called before registering the devices.
292 *
293 * Returns 0 on success or a negative error code.
294 */
295 int __rtnl_link_register(struct rtnl_link_ops *ops)
296 {
297 if (rtnl_link_ops_get(ops->kind))
298 return -EEXIST;
299
300 if (!ops->dellink)
301 ops->dellink = unregister_netdevice_queue;
302
303 list_add_tail(&ops->list, &link_ops);
304 return 0;
305 }
306 EXPORT_SYMBOL_GPL(__rtnl_link_register);
307
308 /**
309 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
310 * @ops: struct rtnl_link_ops * to register
311 *
312 * Returns 0 on success or a negative error code.
313 */
314 int rtnl_link_register(struct rtnl_link_ops *ops)
315 {
316 int err;
317
318 rtnl_lock();
319 err = __rtnl_link_register(ops);
320 rtnl_unlock();
321 return err;
322 }
323 EXPORT_SYMBOL_GPL(rtnl_link_register);
324
325 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
326 {
327 struct net_device *dev;
328 LIST_HEAD(list_kill);
329
330 for_each_netdev(net, dev) {
331 if (dev->rtnl_link_ops == ops)
332 ops->dellink(dev, &list_kill);
333 }
334 unregister_netdevice_many(&list_kill);
335 }
336
337 /**
338 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
339 * @ops: struct rtnl_link_ops * to unregister
340 *
341 * The caller must hold the rtnl_mutex.
342 */
343 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
344 {
345 struct net *net;
346
347 for_each_net(net) {
348 __rtnl_kill_links(net, ops);
349 }
350 list_del(&ops->list);
351 }
352 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
353
354 /**
355 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
356 * @ops: struct rtnl_link_ops * to unregister
357 */
358 void rtnl_link_unregister(struct rtnl_link_ops *ops)
359 {
360 rtnl_lock();
361 __rtnl_link_unregister(ops);
362 rtnl_unlock();
363 }
364 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
365
366 static size_t rtnl_link_get_size(const struct net_device *dev)
367 {
368 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
369 size_t size;
370
371 if (!ops)
372 return 0;
373
374 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
375 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
376
377 if (ops->get_size)
378 /* IFLA_INFO_DATA + nested data */
379 size += nla_total_size(sizeof(struct nlattr)) +
380 ops->get_size(dev);
381
382 if (ops->get_xstats_size)
383 /* IFLA_INFO_XSTATS */
384 size += nla_total_size(ops->get_xstats_size(dev));
385
386 return size;
387 }
388
389 static LIST_HEAD(rtnl_af_ops);
390
391 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
392 {
393 const struct rtnl_af_ops *ops;
394
395 list_for_each_entry(ops, &rtnl_af_ops, list) {
396 if (ops->family == family)
397 return ops;
398 }
399
400 return NULL;
401 }
402
403 /**
404 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
405 * @ops: struct rtnl_af_ops * to register
406 *
407 * The caller must hold the rtnl_mutex.
408 *
409 * Returns 0 on success or a negative error code.
410 */
411 int __rtnl_af_register(struct rtnl_af_ops *ops)
412 {
413 list_add_tail(&ops->list, &rtnl_af_ops);
414 return 0;
415 }
416 EXPORT_SYMBOL_GPL(__rtnl_af_register);
417
418 /**
419 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
420 * @ops: struct rtnl_af_ops * to register
421 *
422 * Returns 0 on success or a negative error code.
423 */
424 int rtnl_af_register(struct rtnl_af_ops *ops)
425 {
426 int err;
427
428 rtnl_lock();
429 err = __rtnl_af_register(ops);
430 rtnl_unlock();
431 return err;
432 }
433 EXPORT_SYMBOL_GPL(rtnl_af_register);
434
435 /**
436 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
437 * @ops: struct rtnl_af_ops * to unregister
438 *
439 * The caller must hold the rtnl_mutex.
440 */
441 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
442 {
443 list_del(&ops->list);
444 }
445 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
446
447 /**
448 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
449 * @ops: struct rtnl_af_ops * to unregister
450 */
451 void rtnl_af_unregister(struct rtnl_af_ops *ops)
452 {
453 rtnl_lock();
454 __rtnl_af_unregister(ops);
455 rtnl_unlock();
456 }
457 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
458
459 static size_t rtnl_link_get_af_size(const struct net_device *dev)
460 {
461 struct rtnl_af_ops *af_ops;
462 size_t size;
463
464 /* IFLA_AF_SPEC */
465 size = nla_total_size(sizeof(struct nlattr));
466
467 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
468 if (af_ops->get_link_af_size) {
469 /* AF_* + nested data */
470 size += nla_total_size(sizeof(struct nlattr)) +
471 af_ops->get_link_af_size(dev);
472 }
473 }
474
475 return size;
476 }
477
478 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
479 {
480 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
481 struct nlattr *linkinfo, *data;
482 int err = -EMSGSIZE;
483
484 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
485 if (linkinfo == NULL)
486 goto out;
487
488 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
489 goto err_cancel_link;
490 if (ops->fill_xstats) {
491 err = ops->fill_xstats(skb, dev);
492 if (err < 0)
493 goto err_cancel_link;
494 }
495 if (ops->fill_info) {
496 data = nla_nest_start(skb, IFLA_INFO_DATA);
497 if (data == NULL)
498 goto err_cancel_link;
499 err = ops->fill_info(skb, dev);
500 if (err < 0)
501 goto err_cancel_data;
502 nla_nest_end(skb, data);
503 }
504
505 nla_nest_end(skb, linkinfo);
506 return 0;
507
508 err_cancel_data:
509 nla_nest_cancel(skb, data);
510 err_cancel_link:
511 nla_nest_cancel(skb, linkinfo);
512 out:
513 return err;
514 }
515
516 static const int rtm_min[RTM_NR_FAMILIES] =
517 {
518 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
519 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
520 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
521 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
522 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
523 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
524 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
525 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
526 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
527 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
528 };
529
530 static const int rta_max[RTM_NR_FAMILIES] =
531 {
532 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
533 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
534 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
535 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
536 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
537 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
538 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
539 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
540 };
541
542 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
543 {
544 struct rtattr *rta;
545 int size = RTA_LENGTH(attrlen);
546
547 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
548 rta->rta_type = attrtype;
549 rta->rta_len = size;
550 memcpy(RTA_DATA(rta), data, attrlen);
551 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
552 }
553 EXPORT_SYMBOL(__rta_fill);
554
555 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
556 {
557 struct sock *rtnl = net->rtnl;
558 int err = 0;
559
560 NETLINK_CB(skb).dst_group = group;
561 if (echo)
562 atomic_inc(&skb->users);
563 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
564 if (echo)
565 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
566 return err;
567 }
568
569 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
570 {
571 struct sock *rtnl = net->rtnl;
572
573 return nlmsg_unicast(rtnl, skb, pid);
574 }
575 EXPORT_SYMBOL(rtnl_unicast);
576
577 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
578 struct nlmsghdr *nlh, gfp_t flags)
579 {
580 struct sock *rtnl = net->rtnl;
581 int report = 0;
582
583 if (nlh)
584 report = nlmsg_report(nlh);
585
586 nlmsg_notify(rtnl, skb, pid, group, report, flags);
587 }
588 EXPORT_SYMBOL(rtnl_notify);
589
590 void rtnl_set_sk_err(struct net *net, u32 group, int error)
591 {
592 struct sock *rtnl = net->rtnl;
593
594 netlink_set_err(rtnl, 0, group, error);
595 }
596 EXPORT_SYMBOL(rtnl_set_sk_err);
597
598 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
599 {
600 struct nlattr *mx;
601 int i, valid = 0;
602
603 mx = nla_nest_start(skb, RTA_METRICS);
604 if (mx == NULL)
605 return -ENOBUFS;
606
607 for (i = 0; i < RTAX_MAX; i++) {
608 if (metrics[i]) {
609 valid++;
610 NLA_PUT_U32(skb, i+1, metrics[i]);
611 }
612 }
613
614 if (!valid) {
615 nla_nest_cancel(skb, mx);
616 return 0;
617 }
618
619 return nla_nest_end(skb, mx);
620
621 nla_put_failure:
622 nla_nest_cancel(skb, mx);
623 return -EMSGSIZE;
624 }
625 EXPORT_SYMBOL(rtnetlink_put_metrics);
626
627 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
628 u32 ts, u32 tsage, long expires, u32 error)
629 {
630 struct rta_cacheinfo ci = {
631 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
632 .rta_used = dst->__use,
633 .rta_clntref = atomic_read(&(dst->__refcnt)),
634 .rta_error = error,
635 .rta_id = id,
636 .rta_ts = ts,
637 .rta_tsage = tsage,
638 };
639
640 if (expires)
641 ci.rta_expires = jiffies_to_clock_t(expires);
642
643 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
644 }
645 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
646
647 static void set_operstate(struct net_device *dev, unsigned char transition)
648 {
649 unsigned char operstate = dev->operstate;
650
651 switch (transition) {
652 case IF_OPER_UP:
653 if ((operstate == IF_OPER_DORMANT ||
654 operstate == IF_OPER_UNKNOWN) &&
655 !netif_dormant(dev))
656 operstate = IF_OPER_UP;
657 break;
658
659 case IF_OPER_DORMANT:
660 if (operstate == IF_OPER_UP ||
661 operstate == IF_OPER_UNKNOWN)
662 operstate = IF_OPER_DORMANT;
663 break;
664 }
665
666 if (dev->operstate != operstate) {
667 write_lock_bh(&dev_base_lock);
668 dev->operstate = operstate;
669 write_unlock_bh(&dev_base_lock);
670 netdev_state_change(dev);
671 }
672 }
673
674 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
675 const struct ifinfomsg *ifm)
676 {
677 unsigned int flags = ifm->ifi_flags;
678
679 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
680 if (ifm->ifi_change)
681 flags = (flags & ifm->ifi_change) |
682 (dev->flags & ~ifm->ifi_change);
683
684 return flags;
685 }
686
687 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
688 const struct rtnl_link_stats64 *b)
689 {
690 a->rx_packets = b->rx_packets;
691 a->tx_packets = b->tx_packets;
692 a->rx_bytes = b->rx_bytes;
693 a->tx_bytes = b->tx_bytes;
694 a->rx_errors = b->rx_errors;
695 a->tx_errors = b->tx_errors;
696 a->rx_dropped = b->rx_dropped;
697 a->tx_dropped = b->tx_dropped;
698
699 a->multicast = b->multicast;
700 a->collisions = b->collisions;
701
702 a->rx_length_errors = b->rx_length_errors;
703 a->rx_over_errors = b->rx_over_errors;
704 a->rx_crc_errors = b->rx_crc_errors;
705 a->rx_frame_errors = b->rx_frame_errors;
706 a->rx_fifo_errors = b->rx_fifo_errors;
707 a->rx_missed_errors = b->rx_missed_errors;
708
709 a->tx_aborted_errors = b->tx_aborted_errors;
710 a->tx_carrier_errors = b->tx_carrier_errors;
711 a->tx_fifo_errors = b->tx_fifo_errors;
712 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
713 a->tx_window_errors = b->tx_window_errors;
714
715 a->rx_compressed = b->rx_compressed;
716 a->tx_compressed = b->tx_compressed;
717 }
718
719 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
720 {
721 memcpy(v, b, sizeof(*b));
722 }
723
724 /* All VF info */
725 static inline int rtnl_vfinfo_size(const struct net_device *dev,
726 u32 ext_filter_mask)
727 {
728 if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
729 (ext_filter_mask & RTEXT_FILTER_VF)) {
730 int num_vfs = dev_num_vf(dev->dev.parent);
731 size_t size = nla_total_size(sizeof(struct nlattr));
732 size += nla_total_size(num_vfs * sizeof(struct nlattr));
733 size += num_vfs *
734 (nla_total_size(sizeof(struct ifla_vf_mac)) +
735 nla_total_size(sizeof(struct ifla_vf_vlan)) +
736 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
737 nla_total_size(sizeof(struct ifla_vf_spoofchk)));
738 return size;
739 } else
740 return 0;
741 }
742
743 static size_t rtnl_port_size(const struct net_device *dev)
744 {
745 size_t port_size = nla_total_size(4) /* PORT_VF */
746 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
747 + nla_total_size(sizeof(struct ifla_port_vsi))
748 /* PORT_VSI_TYPE */
749 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
750 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
751 + nla_total_size(1) /* PROT_VDP_REQUEST */
752 + nla_total_size(2); /* PORT_VDP_RESPONSE */
753 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
754 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
755 + port_size;
756 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
757 + port_size;
758
759 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
760 return 0;
761 if (dev_num_vf(dev->dev.parent))
762 return port_self_size + vf_ports_size +
763 vf_port_size * dev_num_vf(dev->dev.parent);
764 else
765 return port_self_size;
766 }
767
768 static noinline size_t if_nlmsg_size(const struct net_device *dev,
769 u32 ext_filter_mask)
770 {
771 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
772 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
773 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
774 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
775 + nla_total_size(sizeof(struct rtnl_link_ifmap))
776 + nla_total_size(sizeof(struct rtnl_link_stats))
777 + nla_total_size(sizeof(struct rtnl_link_stats64))
778 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
779 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
780 + nla_total_size(4) /* IFLA_TXQLEN */
781 + nla_total_size(4) /* IFLA_WEIGHT */
782 + nla_total_size(4) /* IFLA_MTU */
783 + nla_total_size(4) /* IFLA_LINK */
784 + nla_total_size(4) /* IFLA_MASTER */
785 + nla_total_size(1) /* IFLA_OPERSTATE */
786 + nla_total_size(1) /* IFLA_LINKMODE */
787 + nla_total_size(ext_filter_mask
788 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
789 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
790 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
791 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
792 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
793 }
794
795 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
796 {
797 struct nlattr *vf_ports;
798 struct nlattr *vf_port;
799 int vf;
800 int err;
801
802 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
803 if (!vf_ports)
804 return -EMSGSIZE;
805
806 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
807 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
808 if (!vf_port)
809 goto nla_put_failure;
810 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
811 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
812 if (err == -EMSGSIZE)
813 goto nla_put_failure;
814 if (err) {
815 nla_nest_cancel(skb, vf_port);
816 continue;
817 }
818 nla_nest_end(skb, vf_port);
819 }
820
821 nla_nest_end(skb, vf_ports);
822
823 return 0;
824
825 nla_put_failure:
826 nla_nest_cancel(skb, vf_ports);
827 return -EMSGSIZE;
828 }
829
830 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
831 {
832 struct nlattr *port_self;
833 int err;
834
835 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
836 if (!port_self)
837 return -EMSGSIZE;
838
839 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
840 if (err) {
841 nla_nest_cancel(skb, port_self);
842 return (err == -EMSGSIZE) ? err : 0;
843 }
844
845 nla_nest_end(skb, port_self);
846
847 return 0;
848 }
849
850 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
851 {
852 int err;
853
854 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
855 return 0;
856
857 err = rtnl_port_self_fill(skb, dev);
858 if (err)
859 return err;
860
861 if (dev_num_vf(dev->dev.parent)) {
862 err = rtnl_vf_ports_fill(skb, dev);
863 if (err)
864 return err;
865 }
866
867 return 0;
868 }
869
870 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
871 int type, u32 pid, u32 seq, u32 change,
872 unsigned int flags, u32 ext_filter_mask)
873 {
874 struct ifinfomsg *ifm;
875 struct nlmsghdr *nlh;
876 struct rtnl_link_stats64 temp;
877 const struct rtnl_link_stats64 *stats;
878 struct nlattr *attr, *af_spec;
879 struct rtnl_af_ops *af_ops;
880
881 ASSERT_RTNL();
882 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
883 if (nlh == NULL)
884 return -EMSGSIZE;
885
886 ifm = nlmsg_data(nlh);
887 ifm->ifi_family = AF_UNSPEC;
888 ifm->__ifi_pad = 0;
889 ifm->ifi_type = dev->type;
890 ifm->ifi_index = dev->ifindex;
891 ifm->ifi_flags = dev_get_flags(dev);
892 ifm->ifi_change = change;
893
894 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
895 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
896 NLA_PUT_U8(skb, IFLA_OPERSTATE,
897 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
898 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
899 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
900 NLA_PUT_U32(skb, IFLA_GROUP, dev->group);
901
902 if (dev->ifindex != dev->iflink)
903 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
904
905 if (dev->master)
906 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
907
908 if (dev->qdisc)
909 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
910
911 if (dev->ifalias)
912 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
913
914 if (1) {
915 struct rtnl_link_ifmap map = {
916 .mem_start = dev->mem_start,
917 .mem_end = dev->mem_end,
918 .base_addr = dev->base_addr,
919 .irq = dev->irq,
920 .dma = dev->dma,
921 .port = dev->if_port,
922 };
923 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
924 }
925
926 if (dev->addr_len) {
927 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
928 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
929 }
930
931 attr = nla_reserve(skb, IFLA_STATS,
932 sizeof(struct rtnl_link_stats));
933 if (attr == NULL)
934 goto nla_put_failure;
935
936 stats = dev_get_stats(dev, &temp);
937 copy_rtnl_link_stats(nla_data(attr), stats);
938
939 attr = nla_reserve(skb, IFLA_STATS64,
940 sizeof(struct rtnl_link_stats64));
941 if (attr == NULL)
942 goto nla_put_failure;
943 copy_rtnl_link_stats64(nla_data(attr), stats);
944
945 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF))
946 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
947
948 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
949 && (ext_filter_mask & RTEXT_FILTER_VF)) {
950 int i;
951
952 struct nlattr *vfinfo, *vf;
953 int num_vfs = dev_num_vf(dev->dev.parent);
954
955 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
956 if (!vfinfo)
957 goto nla_put_failure;
958 for (i = 0; i < num_vfs; i++) {
959 struct ifla_vf_info ivi;
960 struct ifla_vf_mac vf_mac;
961 struct ifla_vf_vlan vf_vlan;
962 struct ifla_vf_tx_rate vf_tx_rate;
963 struct ifla_vf_spoofchk vf_spoofchk;
964
965 /*
966 * Not all SR-IOV capable drivers support the
967 * spoofcheck query. Preset to -1 so the user
968 * space tool can detect that the driver didn't
969 * report anything.
970 */
971 ivi.spoofchk = -1;
972 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
973 break;
974 vf_mac.vf =
975 vf_vlan.vf =
976 vf_tx_rate.vf =
977 vf_spoofchk.vf = ivi.vf;
978
979 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
980 vf_vlan.vlan = ivi.vlan;
981 vf_vlan.qos = ivi.qos;
982 vf_tx_rate.rate = ivi.tx_rate;
983 vf_spoofchk.setting = ivi.spoofchk;
984 vf = nla_nest_start(skb, IFLA_VF_INFO);
985 if (!vf) {
986 nla_nest_cancel(skb, vfinfo);
987 goto nla_put_failure;
988 }
989 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
990 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
991 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
992 &vf_tx_rate);
993 NLA_PUT(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
994 &vf_spoofchk);
995 nla_nest_end(skb, vf);
996 }
997 nla_nest_end(skb, vfinfo);
998 }
999
1000 if (rtnl_port_fill(skb, dev))
1001 goto nla_put_failure;
1002
1003 if (dev->rtnl_link_ops) {
1004 if (rtnl_link_fill(skb, dev) < 0)
1005 goto nla_put_failure;
1006 }
1007
1008 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1009 goto nla_put_failure;
1010
1011 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1012 if (af_ops->fill_link_af) {
1013 struct nlattr *af;
1014 int err;
1015
1016 if (!(af = nla_nest_start(skb, af_ops->family)))
1017 goto nla_put_failure;
1018
1019 err = af_ops->fill_link_af(skb, dev);
1020
1021 /*
1022 * Caller may return ENODATA to indicate that there
1023 * was no data to be dumped. This is not an error, it
1024 * means we should trim the attribute header and
1025 * continue.
1026 */
1027 if (err == -ENODATA)
1028 nla_nest_cancel(skb, af);
1029 else if (err < 0)
1030 goto nla_put_failure;
1031
1032 nla_nest_end(skb, af);
1033 }
1034 }
1035
1036 nla_nest_end(skb, af_spec);
1037
1038 return nlmsg_end(skb, nlh);
1039
1040 nla_put_failure:
1041 nlmsg_cancel(skb, nlh);
1042 return -EMSGSIZE;
1043 }
1044
1045 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1046 {
1047 struct net *net = sock_net(skb->sk);
1048 int h, s_h;
1049 int idx = 0, s_idx;
1050 struct net_device *dev;
1051 struct hlist_head *head;
1052 struct hlist_node *node;
1053 struct nlattr *tb[IFLA_MAX+1];
1054 u32 ext_filter_mask = 0;
1055
1056 s_h = cb->args[0];
1057 s_idx = cb->args[1];
1058
1059 rcu_read_lock();
1060 cb->seq = net->dev_base_seq;
1061
1062 if (nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1063 ifla_policy) >= 0) {
1064
1065 if (tb[IFLA_EXT_MASK])
1066 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1067 }
1068
1069 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1070 idx = 0;
1071 head = &net->dev_index_head[h];
1072 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1073 if (idx < s_idx)
1074 goto cont;
1075 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1076 NETLINK_CB(cb->skb).pid,
1077 cb->nlh->nlmsg_seq, 0,
1078 NLM_F_MULTI,
1079 ext_filter_mask) <= 0)
1080 goto out;
1081
1082 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1083 cont:
1084 idx++;
1085 }
1086 }
1087 out:
1088 rcu_read_unlock();
1089 cb->args[1] = idx;
1090 cb->args[0] = h;
1091
1092 return skb->len;
1093 }
1094
1095 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1096 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1097 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1098 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1099 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1100 [IFLA_MTU] = { .type = NLA_U32 },
1101 [IFLA_LINK] = { .type = NLA_U32 },
1102 [IFLA_MASTER] = { .type = NLA_U32 },
1103 [IFLA_TXQLEN] = { .type = NLA_U32 },
1104 [IFLA_WEIGHT] = { .type = NLA_U32 },
1105 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1106 [IFLA_LINKMODE] = { .type = NLA_U8 },
1107 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1108 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1109 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1110 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1111 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1112 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1113 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1114 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1115 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1116 };
1117 EXPORT_SYMBOL(ifla_policy);
1118
1119 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1120 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1121 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1122 };
1123
1124 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1125 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1126 };
1127
1128 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1129 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1130 .len = sizeof(struct ifla_vf_mac) },
1131 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1132 .len = sizeof(struct ifla_vf_vlan) },
1133 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1134 .len = sizeof(struct ifla_vf_tx_rate) },
1135 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY,
1136 .len = sizeof(struct ifla_vf_spoofchk) },
1137 };
1138
1139 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1140 [IFLA_PORT_VF] = { .type = NLA_U32 },
1141 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1142 .len = PORT_PROFILE_MAX },
1143 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1144 .len = sizeof(struct ifla_port_vsi)},
1145 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1146 .len = PORT_UUID_MAX },
1147 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1148 .len = PORT_UUID_MAX },
1149 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1150 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1151 };
1152
1153 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1154 {
1155 struct net *net;
1156 /* Examine the link attributes and figure out which
1157 * network namespace we are talking about.
1158 */
1159 if (tb[IFLA_NET_NS_PID])
1160 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1161 else if (tb[IFLA_NET_NS_FD])
1162 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1163 else
1164 net = get_net(src_net);
1165 return net;
1166 }
1167 EXPORT_SYMBOL(rtnl_link_get_net);
1168
1169 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1170 {
1171 if (dev) {
1172 if (tb[IFLA_ADDRESS] &&
1173 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1174 return -EINVAL;
1175
1176 if (tb[IFLA_BROADCAST] &&
1177 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1178 return -EINVAL;
1179 }
1180
1181 if (tb[IFLA_AF_SPEC]) {
1182 struct nlattr *af;
1183 int rem, err;
1184
1185 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1186 const struct rtnl_af_ops *af_ops;
1187
1188 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1189 return -EAFNOSUPPORT;
1190
1191 if (!af_ops->set_link_af)
1192 return -EOPNOTSUPP;
1193
1194 if (af_ops->validate_link_af) {
1195 err = af_ops->validate_link_af(dev, af);
1196 if (err < 0)
1197 return err;
1198 }
1199 }
1200 }
1201
1202 return 0;
1203 }
1204
1205 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1206 {
1207 int rem, err = -EINVAL;
1208 struct nlattr *vf;
1209 const struct net_device_ops *ops = dev->netdev_ops;
1210
1211 nla_for_each_nested(vf, attr, rem) {
1212 switch (nla_type(vf)) {
1213 case IFLA_VF_MAC: {
1214 struct ifla_vf_mac *ivm;
1215 ivm = nla_data(vf);
1216 err = -EOPNOTSUPP;
1217 if (ops->ndo_set_vf_mac)
1218 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1219 ivm->mac);
1220 break;
1221 }
1222 case IFLA_VF_VLAN: {
1223 struct ifla_vf_vlan *ivv;
1224 ivv = nla_data(vf);
1225 err = -EOPNOTSUPP;
1226 if (ops->ndo_set_vf_vlan)
1227 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1228 ivv->vlan,
1229 ivv->qos);
1230 break;
1231 }
1232 case IFLA_VF_TX_RATE: {
1233 struct ifla_vf_tx_rate *ivt;
1234 ivt = nla_data(vf);
1235 err = -EOPNOTSUPP;
1236 if (ops->ndo_set_vf_tx_rate)
1237 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1238 ivt->rate);
1239 break;
1240 }
1241 case IFLA_VF_SPOOFCHK: {
1242 struct ifla_vf_spoofchk *ivs;
1243 ivs = nla_data(vf);
1244 err = -EOPNOTSUPP;
1245 if (ops->ndo_set_vf_spoofchk)
1246 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1247 ivs->setting);
1248 break;
1249 }
1250 default:
1251 err = -EINVAL;
1252 break;
1253 }
1254 if (err)
1255 break;
1256 }
1257 return err;
1258 }
1259
1260 static int do_set_master(struct net_device *dev, int ifindex)
1261 {
1262 struct net_device *master_dev;
1263 const struct net_device_ops *ops;
1264 int err;
1265
1266 if (dev->master) {
1267 if (dev->master->ifindex == ifindex)
1268 return 0;
1269 ops = dev->master->netdev_ops;
1270 if (ops->ndo_del_slave) {
1271 err = ops->ndo_del_slave(dev->master, dev);
1272 if (err)
1273 return err;
1274 } else {
1275 return -EOPNOTSUPP;
1276 }
1277 }
1278
1279 if (ifindex) {
1280 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1281 if (!master_dev)
1282 return -EINVAL;
1283 ops = master_dev->netdev_ops;
1284 if (ops->ndo_add_slave) {
1285 err = ops->ndo_add_slave(master_dev, dev);
1286 if (err)
1287 return err;
1288 } else {
1289 return -EOPNOTSUPP;
1290 }
1291 }
1292 return 0;
1293 }
1294
1295 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1296 struct nlattr **tb, char *ifname, int modified)
1297 {
1298 const struct net_device_ops *ops = dev->netdev_ops;
1299 int send_addr_notify = 0;
1300 int err;
1301
1302 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1303 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1304 if (IS_ERR(net)) {
1305 err = PTR_ERR(net);
1306 goto errout;
1307 }
1308 err = dev_change_net_namespace(dev, net, ifname);
1309 put_net(net);
1310 if (err)
1311 goto errout;
1312 modified = 1;
1313 }
1314
1315 if (tb[IFLA_MAP]) {
1316 struct rtnl_link_ifmap *u_map;
1317 struct ifmap k_map;
1318
1319 if (!ops->ndo_set_config) {
1320 err = -EOPNOTSUPP;
1321 goto errout;
1322 }
1323
1324 if (!netif_device_present(dev)) {
1325 err = -ENODEV;
1326 goto errout;
1327 }
1328
1329 u_map = nla_data(tb[IFLA_MAP]);
1330 k_map.mem_start = (unsigned long) u_map->mem_start;
1331 k_map.mem_end = (unsigned long) u_map->mem_end;
1332 k_map.base_addr = (unsigned short) u_map->base_addr;
1333 k_map.irq = (unsigned char) u_map->irq;
1334 k_map.dma = (unsigned char) u_map->dma;
1335 k_map.port = (unsigned char) u_map->port;
1336
1337 err = ops->ndo_set_config(dev, &k_map);
1338 if (err < 0)
1339 goto errout;
1340
1341 modified = 1;
1342 }
1343
1344 if (tb[IFLA_ADDRESS]) {
1345 struct sockaddr *sa;
1346 int len;
1347
1348 if (!ops->ndo_set_mac_address) {
1349 err = -EOPNOTSUPP;
1350 goto errout;
1351 }
1352
1353 if (!netif_device_present(dev)) {
1354 err = -ENODEV;
1355 goto errout;
1356 }
1357
1358 len = sizeof(sa_family_t) + dev->addr_len;
1359 sa = kmalloc(len, GFP_KERNEL);
1360 if (!sa) {
1361 err = -ENOMEM;
1362 goto errout;
1363 }
1364 sa->sa_family = dev->type;
1365 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1366 dev->addr_len);
1367 err = ops->ndo_set_mac_address(dev, sa);
1368 kfree(sa);
1369 if (err)
1370 goto errout;
1371 send_addr_notify = 1;
1372 modified = 1;
1373 }
1374
1375 if (tb[IFLA_MTU]) {
1376 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1377 if (err < 0)
1378 goto errout;
1379 modified = 1;
1380 }
1381
1382 if (tb[IFLA_GROUP]) {
1383 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1384 modified = 1;
1385 }
1386
1387 /*
1388 * Interface selected by interface index but interface
1389 * name provided implies that a name change has been
1390 * requested.
1391 */
1392 if (ifm->ifi_index > 0 && ifname[0]) {
1393 err = dev_change_name(dev, ifname);
1394 if (err < 0)
1395 goto errout;
1396 modified = 1;
1397 }
1398
1399 if (tb[IFLA_IFALIAS]) {
1400 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1401 nla_len(tb[IFLA_IFALIAS]));
1402 if (err < 0)
1403 goto errout;
1404 modified = 1;
1405 }
1406
1407 if (tb[IFLA_BROADCAST]) {
1408 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1409 send_addr_notify = 1;
1410 }
1411
1412 if (ifm->ifi_flags || ifm->ifi_change) {
1413 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1414 if (err < 0)
1415 goto errout;
1416 }
1417
1418 if (tb[IFLA_MASTER]) {
1419 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1420 if (err)
1421 goto errout;
1422 modified = 1;
1423 }
1424
1425 if (tb[IFLA_TXQLEN])
1426 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1427
1428 if (tb[IFLA_OPERSTATE])
1429 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1430
1431 if (tb[IFLA_LINKMODE]) {
1432 write_lock_bh(&dev_base_lock);
1433 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1434 write_unlock_bh(&dev_base_lock);
1435 }
1436
1437 if (tb[IFLA_VFINFO_LIST]) {
1438 struct nlattr *attr;
1439 int rem;
1440 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1441 if (nla_type(attr) != IFLA_VF_INFO) {
1442 err = -EINVAL;
1443 goto errout;
1444 }
1445 err = do_setvfinfo(dev, attr);
1446 if (err < 0)
1447 goto errout;
1448 modified = 1;
1449 }
1450 }
1451 err = 0;
1452
1453 if (tb[IFLA_VF_PORTS]) {
1454 struct nlattr *port[IFLA_PORT_MAX+1];
1455 struct nlattr *attr;
1456 int vf;
1457 int rem;
1458
1459 err = -EOPNOTSUPP;
1460 if (!ops->ndo_set_vf_port)
1461 goto errout;
1462
1463 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1464 if (nla_type(attr) != IFLA_VF_PORT)
1465 continue;
1466 err = nla_parse_nested(port, IFLA_PORT_MAX,
1467 attr, ifla_port_policy);
1468 if (err < 0)
1469 goto errout;
1470 if (!port[IFLA_PORT_VF]) {
1471 err = -EOPNOTSUPP;
1472 goto errout;
1473 }
1474 vf = nla_get_u32(port[IFLA_PORT_VF]);
1475 err = ops->ndo_set_vf_port(dev, vf, port);
1476 if (err < 0)
1477 goto errout;
1478 modified = 1;
1479 }
1480 }
1481 err = 0;
1482
1483 if (tb[IFLA_PORT_SELF]) {
1484 struct nlattr *port[IFLA_PORT_MAX+1];
1485
1486 err = nla_parse_nested(port, IFLA_PORT_MAX,
1487 tb[IFLA_PORT_SELF], ifla_port_policy);
1488 if (err < 0)
1489 goto errout;
1490
1491 err = -EOPNOTSUPP;
1492 if (ops->ndo_set_vf_port)
1493 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1494 if (err < 0)
1495 goto errout;
1496 modified = 1;
1497 }
1498
1499 if (tb[IFLA_AF_SPEC]) {
1500 struct nlattr *af;
1501 int rem;
1502
1503 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1504 const struct rtnl_af_ops *af_ops;
1505
1506 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1507 BUG();
1508
1509 err = af_ops->set_link_af(dev, af);
1510 if (err < 0)
1511 goto errout;
1512
1513 modified = 1;
1514 }
1515 }
1516 err = 0;
1517
1518 errout:
1519 if (err < 0 && modified && net_ratelimit())
1520 printk(KERN_WARNING "A link change request failed with "
1521 "some changes committed already. Interface %s may "
1522 "have been left with an inconsistent configuration, "
1523 "please check.\n", dev->name);
1524
1525 if (send_addr_notify)
1526 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1527
1528 return err;
1529 }
1530
1531 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1532 {
1533 struct net *net = sock_net(skb->sk);
1534 struct ifinfomsg *ifm;
1535 struct net_device *dev;
1536 int err;
1537 struct nlattr *tb[IFLA_MAX+1];
1538 char ifname[IFNAMSIZ];
1539
1540 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1541 if (err < 0)
1542 goto errout;
1543
1544 if (tb[IFLA_IFNAME])
1545 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1546 else
1547 ifname[0] = '\0';
1548
1549 err = -EINVAL;
1550 ifm = nlmsg_data(nlh);
1551 if (ifm->ifi_index > 0)
1552 dev = __dev_get_by_index(net, ifm->ifi_index);
1553 else if (tb[IFLA_IFNAME])
1554 dev = __dev_get_by_name(net, ifname);
1555 else
1556 goto errout;
1557
1558 if (dev == NULL) {
1559 err = -ENODEV;
1560 goto errout;
1561 }
1562
1563 err = validate_linkmsg(dev, tb);
1564 if (err < 0)
1565 goto errout;
1566
1567 err = do_setlink(dev, ifm, tb, ifname, 0);
1568 errout:
1569 return err;
1570 }
1571
1572 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1573 {
1574 struct net *net = sock_net(skb->sk);
1575 const struct rtnl_link_ops *ops;
1576 struct net_device *dev;
1577 struct ifinfomsg *ifm;
1578 char ifname[IFNAMSIZ];
1579 struct nlattr *tb[IFLA_MAX+1];
1580 int err;
1581 LIST_HEAD(list_kill);
1582
1583 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1584 if (err < 0)
1585 return err;
1586
1587 if (tb[IFLA_IFNAME])
1588 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1589
1590 ifm = nlmsg_data(nlh);
1591 if (ifm->ifi_index > 0)
1592 dev = __dev_get_by_index(net, ifm->ifi_index);
1593 else if (tb[IFLA_IFNAME])
1594 dev = __dev_get_by_name(net, ifname);
1595 else
1596 return -EINVAL;
1597
1598 if (!dev)
1599 return -ENODEV;
1600
1601 ops = dev->rtnl_link_ops;
1602 if (!ops)
1603 return -EOPNOTSUPP;
1604
1605 ops->dellink(dev, &list_kill);
1606 unregister_netdevice_many(&list_kill);
1607 list_del(&list_kill);
1608 return 0;
1609 }
1610
1611 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1612 {
1613 unsigned int old_flags;
1614 int err;
1615
1616 old_flags = dev->flags;
1617 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1618 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1619 if (err < 0)
1620 return err;
1621 }
1622
1623 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1624 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1625
1626 __dev_notify_flags(dev, old_flags);
1627 return 0;
1628 }
1629 EXPORT_SYMBOL(rtnl_configure_link);
1630
1631 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1632 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1633 {
1634 int err;
1635 struct net_device *dev;
1636 unsigned int num_queues = 1;
1637 unsigned int real_num_queues = 1;
1638
1639 if (ops->get_tx_queues) {
1640 err = ops->get_tx_queues(src_net, tb, &num_queues,
1641 &real_num_queues);
1642 if (err)
1643 goto err;
1644 }
1645 err = -ENOMEM;
1646 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1647 if (!dev)
1648 goto err;
1649
1650 dev_net_set(dev, net);
1651 dev->rtnl_link_ops = ops;
1652 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1653
1654 if (tb[IFLA_MTU])
1655 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1656 if (tb[IFLA_ADDRESS])
1657 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1658 nla_len(tb[IFLA_ADDRESS]));
1659 if (tb[IFLA_BROADCAST])
1660 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1661 nla_len(tb[IFLA_BROADCAST]));
1662 if (tb[IFLA_TXQLEN])
1663 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1664 if (tb[IFLA_OPERSTATE])
1665 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1666 if (tb[IFLA_LINKMODE])
1667 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1668 if (tb[IFLA_GROUP])
1669 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1670
1671 return dev;
1672
1673 err:
1674 return ERR_PTR(err);
1675 }
1676 EXPORT_SYMBOL(rtnl_create_link);
1677
1678 static int rtnl_group_changelink(struct net *net, int group,
1679 struct ifinfomsg *ifm,
1680 struct nlattr **tb)
1681 {
1682 struct net_device *dev;
1683 int err;
1684
1685 for_each_netdev(net, dev) {
1686 if (dev->group == group) {
1687 err = do_setlink(dev, ifm, tb, NULL, 0);
1688 if (err < 0)
1689 return err;
1690 }
1691 }
1692
1693 return 0;
1694 }
1695
1696 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1697 {
1698 struct net *net = sock_net(skb->sk);
1699 const struct rtnl_link_ops *ops;
1700 struct net_device *dev;
1701 struct ifinfomsg *ifm;
1702 char kind[MODULE_NAME_LEN];
1703 char ifname[IFNAMSIZ];
1704 struct nlattr *tb[IFLA_MAX+1];
1705 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1706 int err;
1707
1708 #ifdef CONFIG_MODULES
1709 replay:
1710 #endif
1711 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1712 if (err < 0)
1713 return err;
1714
1715 if (tb[IFLA_IFNAME])
1716 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1717 else
1718 ifname[0] = '\0';
1719
1720 ifm = nlmsg_data(nlh);
1721 if (ifm->ifi_index > 0)
1722 dev = __dev_get_by_index(net, ifm->ifi_index);
1723 else {
1724 if (ifname[0])
1725 dev = __dev_get_by_name(net, ifname);
1726 else
1727 dev = NULL;
1728 }
1729
1730 err = validate_linkmsg(dev, tb);
1731 if (err < 0)
1732 return err;
1733
1734 if (tb[IFLA_LINKINFO]) {
1735 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1736 tb[IFLA_LINKINFO], ifla_info_policy);
1737 if (err < 0)
1738 return err;
1739 } else
1740 memset(linkinfo, 0, sizeof(linkinfo));
1741
1742 if (linkinfo[IFLA_INFO_KIND]) {
1743 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1744 ops = rtnl_link_ops_get(kind);
1745 } else {
1746 kind[0] = '\0';
1747 ops = NULL;
1748 }
1749
1750 if (1) {
1751 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1752 struct net *dest_net;
1753
1754 if (ops) {
1755 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1756 err = nla_parse_nested(attr, ops->maxtype,
1757 linkinfo[IFLA_INFO_DATA],
1758 ops->policy);
1759 if (err < 0)
1760 return err;
1761 data = attr;
1762 }
1763 if (ops->validate) {
1764 err = ops->validate(tb, data);
1765 if (err < 0)
1766 return err;
1767 }
1768 }
1769
1770 if (dev) {
1771 int modified = 0;
1772
1773 if (nlh->nlmsg_flags & NLM_F_EXCL)
1774 return -EEXIST;
1775 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1776 return -EOPNOTSUPP;
1777
1778 if (linkinfo[IFLA_INFO_DATA]) {
1779 if (!ops || ops != dev->rtnl_link_ops ||
1780 !ops->changelink)
1781 return -EOPNOTSUPP;
1782
1783 err = ops->changelink(dev, tb, data);
1784 if (err < 0)
1785 return err;
1786 modified = 1;
1787 }
1788
1789 return do_setlink(dev, ifm, tb, ifname, modified);
1790 }
1791
1792 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1793 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1794 return rtnl_group_changelink(net,
1795 nla_get_u32(tb[IFLA_GROUP]),
1796 ifm, tb);
1797 return -ENODEV;
1798 }
1799
1800 if (ifm->ifi_index)
1801 return -EOPNOTSUPP;
1802 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1803 return -EOPNOTSUPP;
1804
1805 if (!ops) {
1806 #ifdef CONFIG_MODULES
1807 if (kind[0]) {
1808 __rtnl_unlock();
1809 request_module("rtnl-link-%s", kind);
1810 rtnl_lock();
1811 ops = rtnl_link_ops_get(kind);
1812 if (ops)
1813 goto replay;
1814 }
1815 #endif
1816 return -EOPNOTSUPP;
1817 }
1818
1819 if (!ifname[0])
1820 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1821
1822 dest_net = rtnl_link_get_net(net, tb);
1823 if (IS_ERR(dest_net))
1824 return PTR_ERR(dest_net);
1825
1826 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1827
1828 if (IS_ERR(dev))
1829 err = PTR_ERR(dev);
1830 else if (ops->newlink)
1831 err = ops->newlink(net, dev, tb, data);
1832 else
1833 err = register_netdevice(dev);
1834
1835 if (err < 0 && !IS_ERR(dev))
1836 free_netdev(dev);
1837 if (err < 0)
1838 goto out;
1839
1840 err = rtnl_configure_link(dev, ifm);
1841 if (err < 0)
1842 unregister_netdevice(dev);
1843 out:
1844 put_net(dest_net);
1845 return err;
1846 }
1847 }
1848
1849 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1850 {
1851 struct net *net = sock_net(skb->sk);
1852 struct ifinfomsg *ifm;
1853 char ifname[IFNAMSIZ];
1854 struct nlattr *tb[IFLA_MAX+1];
1855 struct net_device *dev = NULL;
1856 struct sk_buff *nskb;
1857 int err;
1858 u32 ext_filter_mask = 0;
1859
1860 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1861 if (err < 0)
1862 return err;
1863
1864 if (tb[IFLA_IFNAME])
1865 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1866
1867 if (tb[IFLA_EXT_MASK])
1868 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1869
1870 ifm = nlmsg_data(nlh);
1871 if (ifm->ifi_index > 0)
1872 dev = __dev_get_by_index(net, ifm->ifi_index);
1873 else if (tb[IFLA_IFNAME])
1874 dev = __dev_get_by_name(net, ifname);
1875 else
1876 return -EINVAL;
1877
1878 if (dev == NULL)
1879 return -ENODEV;
1880
1881 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1882 if (nskb == NULL)
1883 return -ENOBUFS;
1884
1885 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1886 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1887 if (err < 0) {
1888 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1889 WARN_ON(err == -EMSGSIZE);
1890 kfree_skb(nskb);
1891 } else
1892 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1893
1894 return err;
1895 }
1896
1897 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1898 {
1899 struct net *net = sock_net(skb->sk);
1900 struct net_device *dev;
1901 struct nlattr *tb[IFLA_MAX+1];
1902 u32 ext_filter_mask = 0;
1903 u16 min_ifinfo_dump_size = 0;
1904
1905 if (nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1906 ifla_policy) >= 0) {
1907 if (tb[IFLA_EXT_MASK])
1908 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1909 }
1910
1911 if (!ext_filter_mask)
1912 return NLMSG_GOODSIZE;
1913 /*
1914 * traverse the list of net devices and compute the minimum
1915 * buffer size based upon the filter mask.
1916 */
1917 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1918 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1919 if_nlmsg_size(dev,
1920 ext_filter_mask));
1921 }
1922
1923 return min_ifinfo_dump_size;
1924 }
1925
1926 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1927 {
1928 int idx;
1929 int s_idx = cb->family;
1930
1931 if (s_idx == 0)
1932 s_idx = 1;
1933 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1934 int type = cb->nlh->nlmsg_type-RTM_BASE;
1935 if (idx < s_idx || idx == PF_PACKET)
1936 continue;
1937 if (rtnl_msg_handlers[idx] == NULL ||
1938 rtnl_msg_handlers[idx][type].dumpit == NULL)
1939 continue;
1940 if (idx > s_idx)
1941 memset(&cb->args[0], 0, sizeof(cb->args));
1942 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1943 break;
1944 }
1945 cb->family = idx;
1946
1947 return skb->len;
1948 }
1949
1950 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1951 {
1952 struct net *net = dev_net(dev);
1953 struct sk_buff *skb;
1954 int err = -ENOBUFS;
1955 size_t if_info_size;
1956
1957 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1958 if (skb == NULL)
1959 goto errout;
1960
1961 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
1962 if (err < 0) {
1963 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1964 WARN_ON(err == -EMSGSIZE);
1965 kfree_skb(skb);
1966 goto errout;
1967 }
1968 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1969 return;
1970 errout:
1971 if (err < 0)
1972 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1973 }
1974
1975 /* Protected by RTNL sempahore. */
1976 static struct rtattr **rta_buf;
1977 static int rtattr_max;
1978
1979 /* Process one rtnetlink message. */
1980
1981 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1982 {
1983 struct net *net = sock_net(skb->sk);
1984 rtnl_doit_func doit;
1985 int sz_idx, kind;
1986 int min_len;
1987 int family;
1988 int type;
1989 int err;
1990
1991 type = nlh->nlmsg_type;
1992 if (type > RTM_MAX)
1993 return -EOPNOTSUPP;
1994
1995 type -= RTM_BASE;
1996
1997 /* All the messages must have at least 1 byte length */
1998 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1999 return 0;
2000
2001 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
2002 sz_idx = type>>2;
2003 kind = type&3;
2004
2005 if (kind != 2 && !capable(CAP_NET_ADMIN))
2006 return -EPERM;
2007
2008 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2009 struct sock *rtnl;
2010 rtnl_dumpit_func dumpit;
2011 rtnl_calcit_func calcit;
2012 u16 min_dump_alloc = 0;
2013
2014 dumpit = rtnl_get_dumpit(family, type);
2015 if (dumpit == NULL)
2016 return -EOPNOTSUPP;
2017 calcit = rtnl_get_calcit(family, type);
2018 if (calcit)
2019 min_dump_alloc = calcit(skb, nlh);
2020
2021 __rtnl_unlock();
2022 rtnl = net->rtnl;
2023 {
2024 struct netlink_dump_control c = {
2025 .dump = dumpit,
2026 .min_dump_alloc = min_dump_alloc,
2027 };
2028 err = netlink_dump_start(rtnl, skb, nlh, &c);
2029 }
2030 rtnl_lock();
2031 return err;
2032 }
2033
2034 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
2035
2036 min_len = rtm_min[sz_idx];
2037 if (nlh->nlmsg_len < min_len)
2038 return -EINVAL;
2039
2040 if (nlh->nlmsg_len > min_len) {
2041 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
2042 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
2043
2044 while (RTA_OK(attr, attrlen)) {
2045 unsigned flavor = attr->rta_type;
2046 if (flavor) {
2047 if (flavor > rta_max[sz_idx])
2048 return -EINVAL;
2049 rta_buf[flavor-1] = attr;
2050 }
2051 attr = RTA_NEXT(attr, attrlen);
2052 }
2053 }
2054
2055 doit = rtnl_get_doit(family, type);
2056 if (doit == NULL)
2057 return -EOPNOTSUPP;
2058
2059 return doit(skb, nlh, (void *)&rta_buf[0]);
2060 }
2061
2062 static void rtnetlink_rcv(struct sk_buff *skb)
2063 {
2064 rtnl_lock();
2065 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2066 rtnl_unlock();
2067 }
2068
2069 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2070 {
2071 struct net_device *dev = ptr;
2072
2073 switch (event) {
2074 case NETDEV_UP:
2075 case NETDEV_DOWN:
2076 case NETDEV_PRE_UP:
2077 case NETDEV_POST_INIT:
2078 case NETDEV_REGISTER:
2079 case NETDEV_CHANGE:
2080 case NETDEV_PRE_TYPE_CHANGE:
2081 case NETDEV_GOING_DOWN:
2082 case NETDEV_UNREGISTER:
2083 case NETDEV_UNREGISTER_BATCH:
2084 case NETDEV_RELEASE:
2085 case NETDEV_JOIN:
2086 break;
2087 default:
2088 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2089 break;
2090 }
2091 return NOTIFY_DONE;
2092 }
2093
2094 static struct notifier_block rtnetlink_dev_notifier = {
2095 .notifier_call = rtnetlink_event,
2096 };
2097
2098
2099 static int __net_init rtnetlink_net_init(struct net *net)
2100 {
2101 struct sock *sk;
2102 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2103 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2104 if (!sk)
2105 return -ENOMEM;
2106 net->rtnl = sk;
2107 return 0;
2108 }
2109
2110 static void __net_exit rtnetlink_net_exit(struct net *net)
2111 {
2112 netlink_kernel_release(net->rtnl);
2113 net->rtnl = NULL;
2114 }
2115
2116 static struct pernet_operations rtnetlink_net_ops = {
2117 .init = rtnetlink_net_init,
2118 .exit = rtnetlink_net_exit,
2119 };
2120
2121 void __init rtnetlink_init(void)
2122 {
2123 int i;
2124
2125 rtattr_max = 0;
2126 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2127 if (rta_max[i] > rtattr_max)
2128 rtattr_max = rta_max[i];
2129 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2130 if (!rta_buf)
2131 panic("rtnetlink_init: cannot allocate rta_buf\n");
2132
2133 if (register_pernet_subsys(&rtnetlink_net_ops))
2134 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2135
2136 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2137 register_netdevice_notifier(&rtnetlink_dev_notifier);
2138
2139 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2140 rtnl_dump_ifinfo, rtnl_calcit);
2141 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2142 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2143 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2144
2145 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2146 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2147 }
2148
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