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