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um: remove SIGHUP handler
[linux-2.6/x86.git] / net / core / rtnetlink.c
blobd1644e317e70cd2634e92fb5a61153ec18c74882
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 rcu_read_lock();
1011 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1012 idx = 0;
1013 head = &net->dev_index_head[h];
1014 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1015 if (idx < s_idx)
1016 goto cont;
1017 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1018 NETLINK_CB(cb->skb).pid,
1019 cb->nlh->nlmsg_seq, 0,
1020 NLM_F_MULTI) <= 0)
1021 goto out;
1022 cont:
1023 idx++;
1024 }
1025 }
1026 out:
1027 rcu_read_unlock();
1028 cb->args[1] = idx;
1029 cb->args[0] = h;
1030
1031 return skb->len;
1032 }
1033
1034 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1035 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1036 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1037 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1038 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1039 [IFLA_MTU] = { .type = NLA_U32 },
1040 [IFLA_LINK] = { .type = NLA_U32 },
1041 [IFLA_MASTER] = { .type = NLA_U32 },
1042 [IFLA_TXQLEN] = { .type = NLA_U32 },
1043 [IFLA_WEIGHT] = { .type = NLA_U32 },
1044 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1045 [IFLA_LINKMODE] = { .type = NLA_U8 },
1046 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1047 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1048 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1049 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1050 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1051 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1052 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1053 };
1054 EXPORT_SYMBOL(ifla_policy);
1055
1056 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1057 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1058 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1059 };
1060
1061 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1062 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1063 };
1064
1065 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1066 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1067 .len = sizeof(struct ifla_vf_mac) },
1068 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1069 .len = sizeof(struct ifla_vf_vlan) },
1070 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1071 .len = sizeof(struct ifla_vf_tx_rate) },
1072 };
1073
1074 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1075 [IFLA_PORT_VF] = { .type = NLA_U32 },
1076 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1077 .len = PORT_PROFILE_MAX },
1078 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1079 .len = sizeof(struct ifla_port_vsi)},
1080 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1081 .len = PORT_UUID_MAX },
1082 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1083 .len = PORT_UUID_MAX },
1084 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1085 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1086 };
1087
1088 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1089 {
1090 struct net *net;
1091 /* Examine the link attributes and figure out which
1092 * network namespace we are talking about.
1093 */
1094 if (tb[IFLA_NET_NS_PID])
1095 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1096 else
1097 net = get_net(src_net);
1098 return net;
1099 }
1100 EXPORT_SYMBOL(rtnl_link_get_net);
1101
1102 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1103 {
1104 if (dev) {
1105 if (tb[IFLA_ADDRESS] &&
1106 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1107 return -EINVAL;
1108
1109 if (tb[IFLA_BROADCAST] &&
1110 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1111 return -EINVAL;
1112 }
1113
1114 if (tb[IFLA_AF_SPEC]) {
1115 struct nlattr *af;
1116 int rem, err;
1117
1118 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1119 const struct rtnl_af_ops *af_ops;
1120
1121 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1122 return -EAFNOSUPPORT;
1123
1124 if (!af_ops->set_link_af)
1125 return -EOPNOTSUPP;
1126
1127 if (af_ops->validate_link_af) {
1128 err = af_ops->validate_link_af(dev, af);
1129 if (err < 0)
1130 return err;
1131 }
1132 }
1133 }
1134
1135 return 0;
1136 }
1137
1138 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1139 {
1140 int rem, err = -EINVAL;
1141 struct nlattr *vf;
1142 const struct net_device_ops *ops = dev->netdev_ops;
1143
1144 nla_for_each_nested(vf, attr, rem) {
1145 switch (nla_type(vf)) {
1146 case IFLA_VF_MAC: {
1147 struct ifla_vf_mac *ivm;
1148 ivm = nla_data(vf);
1149 err = -EOPNOTSUPP;
1150 if (ops->ndo_set_vf_mac)
1151 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1152 ivm->mac);
1153 break;
1154 }
1155 case IFLA_VF_VLAN: {
1156 struct ifla_vf_vlan *ivv;
1157 ivv = nla_data(vf);
1158 err = -EOPNOTSUPP;
1159 if (ops->ndo_set_vf_vlan)
1160 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1161 ivv->vlan,
1162 ivv->qos);
1163 break;
1164 }
1165 case IFLA_VF_TX_RATE: {
1166 struct ifla_vf_tx_rate *ivt;
1167 ivt = nla_data(vf);
1168 err = -EOPNOTSUPP;
1169 if (ops->ndo_set_vf_tx_rate)
1170 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1171 ivt->rate);
1172 break;
1173 }
1174 default:
1175 err = -EINVAL;
1176 break;
1177 }
1178 if (err)
1179 break;
1180 }
1181 return err;
1182 }
1183
1184 static int do_set_master(struct net_device *dev, int ifindex)
1185 {
1186 struct net_device *master_dev;
1187 const struct net_device_ops *ops;
1188 int err;
1189
1190 if (dev->master) {
1191 if (dev->master->ifindex == ifindex)
1192 return 0;
1193 ops = dev->master->netdev_ops;
1194 if (ops->ndo_del_slave) {
1195 err = ops->ndo_del_slave(dev->master, dev);
1196 if (err)
1197 return err;
1198 } else {
1199 return -EOPNOTSUPP;
1200 }
1201 }
1202
1203 if (ifindex) {
1204 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1205 if (!master_dev)
1206 return -EINVAL;
1207 ops = master_dev->netdev_ops;
1208 if (ops->ndo_add_slave) {
1209 err = ops->ndo_add_slave(master_dev, dev);
1210 if (err)
1211 return err;
1212 } else {
1213 return -EOPNOTSUPP;
1214 }
1215 }
1216 return 0;
1217 }
1218
1219 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1220 struct nlattr **tb, char *ifname, int modified)
1221 {
1222 const struct net_device_ops *ops = dev->netdev_ops;
1223 int send_addr_notify = 0;
1224 int err;
1225
1226 if (tb[IFLA_NET_NS_PID]) {
1227 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1228 if (IS_ERR(net)) {
1229 err = PTR_ERR(net);
1230 goto errout;
1231 }
1232 err = dev_change_net_namespace(dev, net, ifname);
1233 put_net(net);
1234 if (err)
1235 goto errout;
1236 modified = 1;
1237 }
1238
1239 if (tb[IFLA_MAP]) {
1240 struct rtnl_link_ifmap *u_map;
1241 struct ifmap k_map;
1242
1243 if (!ops->ndo_set_config) {
1244 err = -EOPNOTSUPP;
1245 goto errout;
1246 }
1247
1248 if (!netif_device_present(dev)) {
1249 err = -ENODEV;
1250 goto errout;
1251 }
1252
1253 u_map = nla_data(tb[IFLA_MAP]);
1254 k_map.mem_start = (unsigned long) u_map->mem_start;
1255 k_map.mem_end = (unsigned long) u_map->mem_end;
1256 k_map.base_addr = (unsigned short) u_map->base_addr;
1257 k_map.irq = (unsigned char) u_map->irq;
1258 k_map.dma = (unsigned char) u_map->dma;
1259 k_map.port = (unsigned char) u_map->port;
1260
1261 err = ops->ndo_set_config(dev, &k_map);
1262 if (err < 0)
1263 goto errout;
1264
1265 modified = 1;
1266 }
1267
1268 if (tb[IFLA_ADDRESS]) {
1269 struct sockaddr *sa;
1270 int len;
1271
1272 if (!ops->ndo_set_mac_address) {
1273 err = -EOPNOTSUPP;
1274 goto errout;
1275 }
1276
1277 if (!netif_device_present(dev)) {
1278 err = -ENODEV;
1279 goto errout;
1280 }
1281
1282 len = sizeof(sa_family_t) + dev->addr_len;
1283 sa = kmalloc(len, GFP_KERNEL);
1284 if (!sa) {
1285 err = -ENOMEM;
1286 goto errout;
1287 }
1288 sa->sa_family = dev->type;
1289 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1290 dev->addr_len);
1291 err = ops->ndo_set_mac_address(dev, sa);
1292 kfree(sa);
1293 if (err)
1294 goto errout;
1295 send_addr_notify = 1;
1296 modified = 1;
1297 }
1298
1299 if (tb[IFLA_MTU]) {
1300 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1301 if (err < 0)
1302 goto errout;
1303 modified = 1;
1304 }
1305
1306 if (tb[IFLA_GROUP]) {
1307 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1308 modified = 1;
1309 }
1310
1311 /*
1312 * Interface selected by interface index but interface
1313 * name provided implies that a name change has been
1314 * requested.
1315 */
1316 if (ifm->ifi_index > 0 && ifname[0]) {
1317 err = dev_change_name(dev, ifname);
1318 if (err < 0)
1319 goto errout;
1320 modified = 1;
1321 }
1322
1323 if (tb[IFLA_IFALIAS]) {
1324 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1325 nla_len(tb[IFLA_IFALIAS]));
1326 if (err < 0)
1327 goto errout;
1328 modified = 1;
1329 }
1330
1331 if (tb[IFLA_BROADCAST]) {
1332 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1333 send_addr_notify = 1;
1334 }
1335
1336 if (ifm->ifi_flags || ifm->ifi_change) {
1337 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1338 if (err < 0)
1339 goto errout;
1340 }
1341
1342 if (tb[IFLA_MASTER]) {
1343 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1344 if (err)
1345 goto errout;
1346 modified = 1;
1347 }
1348
1349 if (tb[IFLA_TXQLEN])
1350 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1351
1352 if (tb[IFLA_OPERSTATE])
1353 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1354
1355 if (tb[IFLA_LINKMODE]) {
1356 write_lock_bh(&dev_base_lock);
1357 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1358 write_unlock_bh(&dev_base_lock);
1359 }
1360
1361 if (tb[IFLA_VFINFO_LIST]) {
1362 struct nlattr *attr;
1363 int rem;
1364 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1365 if (nla_type(attr) != IFLA_VF_INFO) {
1366 err = -EINVAL;
1367 goto errout;
1368 }
1369 err = do_setvfinfo(dev, attr);
1370 if (err < 0)
1371 goto errout;
1372 modified = 1;
1373 }
1374 }
1375 err = 0;
1376
1377 if (tb[IFLA_VF_PORTS]) {
1378 struct nlattr *port[IFLA_PORT_MAX+1];
1379 struct nlattr *attr;
1380 int vf;
1381 int rem;
1382
1383 err = -EOPNOTSUPP;
1384 if (!ops->ndo_set_vf_port)
1385 goto errout;
1386
1387 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1388 if (nla_type(attr) != IFLA_VF_PORT)
1389 continue;
1390 err = nla_parse_nested(port, IFLA_PORT_MAX,
1391 attr, ifla_port_policy);
1392 if (err < 0)
1393 goto errout;
1394 if (!port[IFLA_PORT_VF]) {
1395 err = -EOPNOTSUPP;
1396 goto errout;
1397 }
1398 vf = nla_get_u32(port[IFLA_PORT_VF]);
1399 err = ops->ndo_set_vf_port(dev, vf, port);
1400 if (err < 0)
1401 goto errout;
1402 modified = 1;
1403 }
1404 }
1405 err = 0;
1406
1407 if (tb[IFLA_PORT_SELF]) {
1408 struct nlattr *port[IFLA_PORT_MAX+1];
1409
1410 err = nla_parse_nested(port, IFLA_PORT_MAX,
1411 tb[IFLA_PORT_SELF], ifla_port_policy);
1412 if (err < 0)
1413 goto errout;
1414
1415 err = -EOPNOTSUPP;
1416 if (ops->ndo_set_vf_port)
1417 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1418 if (err < 0)
1419 goto errout;
1420 modified = 1;
1421 }
1422
1423 if (tb[IFLA_AF_SPEC]) {
1424 struct nlattr *af;
1425 int rem;
1426
1427 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1428 const struct rtnl_af_ops *af_ops;
1429
1430 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1431 BUG();
1432
1433 err = af_ops->set_link_af(dev, af);
1434 if (err < 0)
1435 goto errout;
1436
1437 modified = 1;
1438 }
1439 }
1440 err = 0;
1441
1442 errout:
1443 if (err < 0 && modified && net_ratelimit())
1444 printk(KERN_WARNING "A link change request failed with "
1445 "some changes committed already. Interface %s may "
1446 "have been left with an inconsistent configuration, "
1447 "please check.\n", dev->name);
1448
1449 if (send_addr_notify)
1450 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1451 return err;
1452 }
1453
1454 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1455 {
1456 struct net *net = sock_net(skb->sk);
1457 struct ifinfomsg *ifm;
1458 struct net_device *dev;
1459 int err;
1460 struct nlattr *tb[IFLA_MAX+1];
1461 char ifname[IFNAMSIZ];
1462
1463 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1464 if (err < 0)
1465 goto errout;
1466
1467 if (tb[IFLA_IFNAME])
1468 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1469 else
1470 ifname[0] = '\0';
1471
1472 err = -EINVAL;
1473 ifm = nlmsg_data(nlh);
1474 if (ifm->ifi_index > 0)
1475 dev = __dev_get_by_index(net, ifm->ifi_index);
1476 else if (tb[IFLA_IFNAME])
1477 dev = __dev_get_by_name(net, ifname);
1478 else
1479 goto errout;
1480
1481 if (dev == NULL) {
1482 err = -ENODEV;
1483 goto errout;
1484 }
1485
1486 err = validate_linkmsg(dev, tb);
1487 if (err < 0)
1488 goto errout;
1489
1490 err = do_setlink(dev, ifm, tb, ifname, 0);
1491 errout:
1492 return err;
1493 }
1494
1495 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1496 {
1497 struct net *net = sock_net(skb->sk);
1498 const struct rtnl_link_ops *ops;
1499 struct net_device *dev;
1500 struct ifinfomsg *ifm;
1501 char ifname[IFNAMSIZ];
1502 struct nlattr *tb[IFLA_MAX+1];
1503 int err;
1504 LIST_HEAD(list_kill);
1505
1506 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1507 if (err < 0)
1508 return err;
1509
1510 if (tb[IFLA_IFNAME])
1511 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1512
1513 ifm = nlmsg_data(nlh);
1514 if (ifm->ifi_index > 0)
1515 dev = __dev_get_by_index(net, ifm->ifi_index);
1516 else if (tb[IFLA_IFNAME])
1517 dev = __dev_get_by_name(net, ifname);
1518 else
1519 return -EINVAL;
1520
1521 if (!dev)
1522 return -ENODEV;
1523
1524 ops = dev->rtnl_link_ops;
1525 if (!ops)
1526 return -EOPNOTSUPP;
1527
1528 ops->dellink(dev, &list_kill);
1529 unregister_netdevice_many(&list_kill);
1530 list_del(&list_kill);
1531 return 0;
1532 }
1533
1534 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1535 {
1536 unsigned int old_flags;
1537 int err;
1538
1539 old_flags = dev->flags;
1540 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1541 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1542 if (err < 0)
1543 return err;
1544 }
1545
1546 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1547 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1548
1549 __dev_notify_flags(dev, old_flags);
1550 return 0;
1551 }
1552 EXPORT_SYMBOL(rtnl_configure_link);
1553
1554 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1555 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1556 {
1557 int err;
1558 struct net_device *dev;
1559 unsigned int num_queues = 1;
1560 unsigned int real_num_queues = 1;
1561
1562 if (ops->get_tx_queues) {
1563 err = ops->get_tx_queues(src_net, tb, &num_queues,
1564 &real_num_queues);
1565 if (err)
1566 goto err;
1567 }
1568 err = -ENOMEM;
1569 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1570 if (!dev)
1571 goto err;
1572
1573 dev_net_set(dev, net);
1574 dev->rtnl_link_ops = ops;
1575 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1576 dev->real_num_tx_queues = real_num_queues;
1577
1578 if (tb[IFLA_MTU])
1579 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1580 if (tb[IFLA_ADDRESS])
1581 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1582 nla_len(tb[IFLA_ADDRESS]));
1583 if (tb[IFLA_BROADCAST])
1584 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1585 nla_len(tb[IFLA_BROADCAST]));
1586 if (tb[IFLA_TXQLEN])
1587 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1588 if (tb[IFLA_OPERSTATE])
1589 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1590 if (tb[IFLA_LINKMODE])
1591 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1592 if (tb[IFLA_GROUP])
1593 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1594
1595 return dev;
1596
1597 err:
1598 return ERR_PTR(err);
1599 }
1600 EXPORT_SYMBOL(rtnl_create_link);
1601
1602 static int rtnl_group_changelink(struct net *net, int group,
1603 struct ifinfomsg *ifm,
1604 struct nlattr **tb)
1605 {
1606 struct net_device *dev;
1607 int err;
1608
1609 for_each_netdev(net, dev) {
1610 if (dev->group == group) {
1611 err = do_setlink(dev, ifm, tb, NULL, 0);
1612 if (err < 0)
1613 return err;
1614 }
1615 }
1616
1617 return 0;
1618 }
1619
1620 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1621 {
1622 struct net *net = sock_net(skb->sk);
1623 const struct rtnl_link_ops *ops;
1624 struct net_device *dev;
1625 struct ifinfomsg *ifm;
1626 char kind[MODULE_NAME_LEN];
1627 char ifname[IFNAMSIZ];
1628 struct nlattr *tb[IFLA_MAX+1];
1629 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1630 int err;
1631
1632 #ifdef CONFIG_MODULES
1633 replay:
1634 #endif
1635 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1636 if (err < 0)
1637 return err;
1638
1639 if (tb[IFLA_IFNAME])
1640 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1641 else
1642 ifname[0] = '\0';
1643
1644 ifm = nlmsg_data(nlh);
1645 if (ifm->ifi_index > 0)
1646 dev = __dev_get_by_index(net, ifm->ifi_index);
1647 else {
1648 if (ifname[0])
1649 dev = __dev_get_by_name(net, ifname);
1650 else
1651 dev = NULL;
1652 }
1653
1654 err = validate_linkmsg(dev, tb);
1655 if (err < 0)
1656 return err;
1657
1658 if (tb[IFLA_LINKINFO]) {
1659 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1660 tb[IFLA_LINKINFO], ifla_info_policy);
1661 if (err < 0)
1662 return err;
1663 } else
1664 memset(linkinfo, 0, sizeof(linkinfo));
1665
1666 if (linkinfo[IFLA_INFO_KIND]) {
1667 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1668 ops = rtnl_link_ops_get(kind);
1669 } else {
1670 kind[0] = '\0';
1671 ops = NULL;
1672 }
1673
1674 if (1) {
1675 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1676 struct net *dest_net;
1677
1678 if (ops) {
1679 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1680 err = nla_parse_nested(attr, ops->maxtype,
1681 linkinfo[IFLA_INFO_DATA],
1682 ops->policy);
1683 if (err < 0)
1684 return err;
1685 data = attr;
1686 }
1687 if (ops->validate) {
1688 err = ops->validate(tb, data);
1689 if (err < 0)
1690 return err;
1691 }
1692 }
1693
1694 if (dev) {
1695 int modified = 0;
1696
1697 if (nlh->nlmsg_flags & NLM_F_EXCL)
1698 return -EEXIST;
1699 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1700 return -EOPNOTSUPP;
1701
1702 if (linkinfo[IFLA_INFO_DATA]) {
1703 if (!ops || ops != dev->rtnl_link_ops ||
1704 !ops->changelink)
1705 return -EOPNOTSUPP;
1706
1707 err = ops->changelink(dev, tb, data);
1708 if (err < 0)
1709 return err;
1710 modified = 1;
1711 }
1712
1713 return do_setlink(dev, ifm, tb, ifname, modified);
1714 }
1715
1716 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1717 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1718 return rtnl_group_changelink(net,
1719 nla_get_u32(tb[IFLA_GROUP]),
1720 ifm, tb);
1721 return -ENODEV;
1722 }
1723
1724 if (ifm->ifi_index)
1725 return -EOPNOTSUPP;
1726 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1727 return -EOPNOTSUPP;
1728
1729 if (!ops) {
1730 #ifdef CONFIG_MODULES
1731 if (kind[0]) {
1732 __rtnl_unlock();
1733 request_module("rtnl-link-%s", kind);
1734 rtnl_lock();
1735 ops = rtnl_link_ops_get(kind);
1736 if (ops)
1737 goto replay;
1738 }
1739 #endif
1740 return -EOPNOTSUPP;
1741 }
1742
1743 if (!ifname[0])
1744 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1745
1746 dest_net = rtnl_link_get_net(net, tb);
1747 if (IS_ERR(dest_net))
1748 return PTR_ERR(dest_net);
1749
1750 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1751
1752 if (IS_ERR(dev))
1753 err = PTR_ERR(dev);
1754 else if (ops->newlink)
1755 err = ops->newlink(net, dev, tb, data);
1756 else
1757 err = register_netdevice(dev);
1758
1759 if (err < 0 && !IS_ERR(dev))
1760 free_netdev(dev);
1761 if (err < 0)
1762 goto out;
1763
1764 err = rtnl_configure_link(dev, ifm);
1765 if (err < 0)
1766 unregister_netdevice(dev);
1767 out:
1768 put_net(dest_net);
1769 return err;
1770 }
1771 }
1772
1773 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1774 {
1775 struct net *net = sock_net(skb->sk);
1776 struct ifinfomsg *ifm;
1777 char ifname[IFNAMSIZ];
1778 struct nlattr *tb[IFLA_MAX+1];
1779 struct net_device *dev = NULL;
1780 struct sk_buff *nskb;
1781 int err;
1782
1783 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1784 if (err < 0)
1785 return err;
1786
1787 if (tb[IFLA_IFNAME])
1788 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1789
1790 ifm = nlmsg_data(nlh);
1791 if (ifm->ifi_index > 0)
1792 dev = __dev_get_by_index(net, ifm->ifi_index);
1793 else if (tb[IFLA_IFNAME])
1794 dev = __dev_get_by_name(net, ifname);
1795 else
1796 return -EINVAL;
1797
1798 if (dev == NULL)
1799 return -ENODEV;
1800
1801 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1802 if (nskb == NULL)
1803 return -ENOBUFS;
1804
1805 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1806 nlh->nlmsg_seq, 0, 0);
1807 if (err < 0) {
1808 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1809 WARN_ON(err == -EMSGSIZE);
1810 kfree_skb(nskb);
1811 } else
1812 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1813
1814 return err;
1815 }
1816
1817 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1818 {
1819 int idx;
1820 int s_idx = cb->family;
1821
1822 if (s_idx == 0)
1823 s_idx = 1;
1824 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1825 int type = cb->nlh->nlmsg_type-RTM_BASE;
1826 if (idx < s_idx || idx == PF_PACKET)
1827 continue;
1828 if (rtnl_msg_handlers[idx] == NULL ||
1829 rtnl_msg_handlers[idx][type].dumpit == NULL)
1830 continue;
1831 if (idx > s_idx)
1832 memset(&cb->args[0], 0, sizeof(cb->args));
1833 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1834 break;
1835 }
1836 cb->family = idx;
1837
1838 return skb->len;
1839 }
1840
1841 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1842 {
1843 struct net *net = dev_net(dev);
1844 struct sk_buff *skb;
1845 int err = -ENOBUFS;
1846
1847 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1848 if (skb == NULL)
1849 goto errout;
1850
1851 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1852 if (err < 0) {
1853 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1854 WARN_ON(err == -EMSGSIZE);
1855 kfree_skb(skb);
1856 goto errout;
1857 }
1858 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1859 return;
1860 errout:
1861 if (err < 0)
1862 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1863 }
1864
1865 /* Protected by RTNL sempahore. */
1866 static struct rtattr **rta_buf;
1867 static int rtattr_max;
1868
1869 /* Process one rtnetlink message. */
1870
1871 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1872 {
1873 struct net *net = sock_net(skb->sk);
1874 rtnl_doit_func doit;
1875 int sz_idx, kind;
1876 int min_len;
1877 int family;
1878 int type;
1879
1880 type = nlh->nlmsg_type;
1881 if (type > RTM_MAX)
1882 return -EOPNOTSUPP;
1883
1884 type -= RTM_BASE;
1885
1886 /* All the messages must have at least 1 byte length */
1887 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1888 return 0;
1889
1890 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1891 sz_idx = type>>2;
1892 kind = type&3;
1893
1894 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1895 return -EPERM;
1896
1897 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1898 struct sock *rtnl;
1899 rtnl_dumpit_func dumpit;
1900
1901 dumpit = rtnl_get_dumpit(family, type);
1902 if (dumpit == NULL)
1903 return -EOPNOTSUPP;
1904
1905 rtnl = net->rtnl;
1906 return netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1907 }
1908
1909 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1910
1911 min_len = rtm_min[sz_idx];
1912 if (nlh->nlmsg_len < min_len)
1913 return -EINVAL;
1914
1915 if (nlh->nlmsg_len > min_len) {
1916 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1917 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1918
1919 while (RTA_OK(attr, attrlen)) {
1920 unsigned flavor = attr->rta_type;
1921 if (flavor) {
1922 if (flavor > rta_max[sz_idx])
1923 return -EINVAL;
1924 rta_buf[flavor-1] = attr;
1925 }
1926 attr = RTA_NEXT(attr, attrlen);
1927 }
1928 }
1929
1930 doit = rtnl_get_doit(family, type);
1931 if (doit == NULL)
1932 return -EOPNOTSUPP;
1933
1934 return doit(skb, nlh, (void *)&rta_buf[0]);
1935 }
1936
1937 static void rtnetlink_rcv(struct sk_buff *skb)
1938 {
1939 rtnl_lock();
1940 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1941 rtnl_unlock();
1942 }
1943
1944 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1945 {
1946 struct net_device *dev = ptr;
1947
1948 switch (event) {
1949 case NETDEV_UP:
1950 case NETDEV_DOWN:
1951 case NETDEV_PRE_UP:
1952 case NETDEV_POST_INIT:
1953 case NETDEV_REGISTER:
1954 case NETDEV_CHANGE:
1955 case NETDEV_PRE_TYPE_CHANGE:
1956 case NETDEV_GOING_DOWN:
1957 case NETDEV_UNREGISTER:
1958 case NETDEV_UNREGISTER_BATCH:
1959 case NETDEV_RELEASE:
1960 case NETDEV_JOIN:
1961 break;
1962 default:
1963 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1964 break;
1965 }
1966 return NOTIFY_DONE;
1967 }
1968
1969 static struct notifier_block rtnetlink_dev_notifier = {
1970 .notifier_call = rtnetlink_event,
1971 };
1972
1973
1974 static int __net_init rtnetlink_net_init(struct net *net)
1975 {
1976 struct sock *sk;
1977 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1978 rtnetlink_rcv, NULL, THIS_MODULE);
1979 if (!sk)
1980 return -ENOMEM;
1981 net->rtnl = sk;
1982 return 0;
1983 }
1984
1985 static void __net_exit rtnetlink_net_exit(struct net *net)
1986 {
1987 netlink_kernel_release(net->rtnl);
1988 net->rtnl = NULL;
1989 }
1990
1991 static struct pernet_operations rtnetlink_net_ops = {
1992 .init = rtnetlink_net_init,
1993 .exit = rtnetlink_net_exit,
1994 };
1995
1996 void __init rtnetlink_init(void)
1997 {
1998 int i;
1999
2000 rtattr_max = 0;
2001 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2002 if (rta_max[i] > rtattr_max)
2003 rtattr_max = rta_max[i];
2004 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2005 if (!rta_buf)
2006 panic("rtnetlink_init: cannot allocate rta_buf\n");
2007
2008 if (register_pernet_subsys(&rtnetlink_net_ops))
2009 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2010
2011 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2012 register_netdevice_notifier(&rtnetlink_dev_notifier);
2013
2014 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
2015 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
2016 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
2017 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
2018
2019 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
2020 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
2021 }
2022
x86 "subsystem" repository