net: dont hold rtnl mutex during netlink dump callbacks
[linux-2.6.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         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
1505         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1506         if (err < 0)
1507                 return err;
1508
1509         if (tb[IFLA_IFNAME])
1510                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1511
1512         ifm = nlmsg_data(nlh);
1513         if (ifm->ifi_index > 0)
1514                 dev = __dev_get_by_index(net, ifm->ifi_index);
1515         else if (tb[IFLA_IFNAME])
1516                 dev = __dev_get_by_name(net, ifname);
1517         else
1518                 return -EINVAL;
1519
1520         if (!dev)
1521                 return -ENODEV;
1522
1523         ops = dev->rtnl_link_ops;
1524         if (!ops)
1525                 return -EOPNOTSUPP;
1526
1527         ops->dellink(dev, NULL);
1528         return 0;
1529 }
1530
1531 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1532 {
1533         unsigned int old_flags;
1534         int err;
1535
1536         old_flags = dev->flags;
1537         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1538                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1539                 if (err < 0)
1540                         return err;
1541         }
1542
1543         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1544         rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1545
1546         __dev_notify_flags(dev, old_flags);
1547         return 0;
1548 }
1549 EXPORT_SYMBOL(rtnl_configure_link);
1550
1551 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1552         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1553 {
1554         int err;
1555         struct net_device *dev;
1556         unsigned int num_queues = 1;
1557         unsigned int real_num_queues = 1;
1558
1559         if (ops->get_tx_queues) {
1560                 err = ops->get_tx_queues(src_net, tb, &num_queues,
1561                                          &real_num_queues);
1562                 if (err)
1563                         goto err;
1564         }
1565         err = -ENOMEM;
1566         dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1567         if (!dev)
1568                 goto err;
1569
1570         dev_net_set(dev, net);
1571         dev->rtnl_link_ops = ops;
1572         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1573         dev->real_num_tx_queues = real_num_queues;
1574
1575         if (strchr(dev->name, '%')) {
1576                 err = dev_alloc_name(dev, dev->name);
1577                 if (err < 0)
1578                         goto err_free;
1579         }
1580
1581         if (tb[IFLA_MTU])
1582                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1583         if (tb[IFLA_ADDRESS])
1584                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1585                                 nla_len(tb[IFLA_ADDRESS]));
1586         if (tb[IFLA_BROADCAST])
1587                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1588                                 nla_len(tb[IFLA_BROADCAST]));
1589         if (tb[IFLA_TXQLEN])
1590                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1591         if (tb[IFLA_OPERSTATE])
1592                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1593         if (tb[IFLA_LINKMODE])
1594                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1595         if (tb[IFLA_GROUP])
1596                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1597
1598         return dev;
1599
1600 err_free:
1601         free_netdev(dev);
1602 err:
1603         return ERR_PTR(err);
1604 }
1605 EXPORT_SYMBOL(rtnl_create_link);
1606
1607 static int rtnl_group_changelink(struct net *net, int group,
1608                 struct ifinfomsg *ifm,
1609                 struct nlattr **tb)
1610 {
1611         struct net_device *dev;
1612         int err;
1613
1614         for_each_netdev(net, dev) {
1615                 if (dev->group == group) {
1616                         err = do_setlink(dev, ifm, tb, NULL, 0);
1617                         if (err < 0)
1618                                 return err;
1619                 }
1620         }
1621
1622         return 0;
1623 }
1624
1625 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1626 {
1627         struct net *net = sock_net(skb->sk);
1628         const struct rtnl_link_ops *ops;
1629         struct net_device *dev;
1630         struct ifinfomsg *ifm;
1631         char kind[MODULE_NAME_LEN];
1632         char ifname[IFNAMSIZ];
1633         struct nlattr *tb[IFLA_MAX+1];
1634         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1635         int err;
1636
1637 #ifdef CONFIG_MODULES
1638 replay:
1639 #endif
1640         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1641         if (err < 0)
1642                 return err;
1643
1644         if (tb[IFLA_IFNAME])
1645                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1646         else
1647                 ifname[0] = '\0';
1648
1649         ifm = nlmsg_data(nlh);
1650         if (ifm->ifi_index > 0)
1651                 dev = __dev_get_by_index(net, ifm->ifi_index);
1652         else {
1653                 if (ifname[0])
1654                         dev = __dev_get_by_name(net, ifname);
1655                 else
1656                         dev = NULL;
1657         }
1658
1659         err = validate_linkmsg(dev, tb);
1660         if (err < 0)
1661                 return err;
1662
1663         if (tb[IFLA_LINKINFO]) {
1664                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1665                                        tb[IFLA_LINKINFO], ifla_info_policy);
1666                 if (err < 0)
1667                         return err;
1668         } else
1669                 memset(linkinfo, 0, sizeof(linkinfo));
1670
1671         if (linkinfo[IFLA_INFO_KIND]) {
1672                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1673                 ops = rtnl_link_ops_get(kind);
1674         } else {
1675                 kind[0] = '\0';
1676                 ops = NULL;
1677         }
1678
1679         if (1) {
1680                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1681                 struct net *dest_net;
1682
1683                 if (ops) {
1684                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1685                                 err = nla_parse_nested(attr, ops->maxtype,
1686                                                        linkinfo[IFLA_INFO_DATA],
1687                                                        ops->policy);
1688                                 if (err < 0)
1689                                         return err;
1690                                 data = attr;
1691                         }
1692                         if (ops->validate) {
1693                                 err = ops->validate(tb, data);
1694                                 if (err < 0)
1695                                         return err;
1696                         }
1697                 }
1698
1699                 if (dev) {
1700                         int modified = 0;
1701
1702                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1703                                 return -EEXIST;
1704                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1705                                 return -EOPNOTSUPP;
1706
1707                         if (linkinfo[IFLA_INFO_DATA]) {
1708                                 if (!ops || ops != dev->rtnl_link_ops ||
1709                                     !ops->changelink)
1710                                         return -EOPNOTSUPP;
1711
1712                                 err = ops->changelink(dev, tb, data);
1713                                 if (err < 0)
1714                                         return err;
1715                                 modified = 1;
1716                         }
1717
1718                         return do_setlink(dev, ifm, tb, ifname, modified);
1719                 }
1720
1721                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1722                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1723                                 return rtnl_group_changelink(net,
1724                                                 nla_get_u32(tb[IFLA_GROUP]),
1725                                                 ifm, tb);
1726                         return -ENODEV;
1727                 }
1728
1729                 if (ifm->ifi_index)
1730                         return -EOPNOTSUPP;
1731                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1732                         return -EOPNOTSUPP;
1733
1734                 if (!ops) {
1735 #ifdef CONFIG_MODULES
1736                         if (kind[0]) {
1737                                 __rtnl_unlock();
1738                                 request_module("rtnl-link-%s", kind);
1739                                 rtnl_lock();
1740                                 ops = rtnl_link_ops_get(kind);
1741                                 if (ops)
1742                                         goto replay;
1743                         }
1744 #endif
1745                         return -EOPNOTSUPP;
1746                 }
1747
1748                 if (!ifname[0])
1749                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1750
1751                 dest_net = rtnl_link_get_net(net, tb);
1752                 if (IS_ERR(dest_net))
1753                         return PTR_ERR(dest_net);
1754
1755                 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1756
1757                 if (IS_ERR(dev))
1758                         err = PTR_ERR(dev);
1759                 else if (ops->newlink)
1760                         err = ops->newlink(net, dev, tb, data);
1761                 else
1762                         err = register_netdevice(dev);
1763
1764                 if (err < 0 && !IS_ERR(dev))
1765                         free_netdev(dev);
1766                 if (err < 0)
1767                         goto out;
1768
1769                 err = rtnl_configure_link(dev, ifm);
1770                 if (err < 0)
1771                         unregister_netdevice(dev);
1772 out:
1773                 put_net(dest_net);
1774                 return err;
1775         }
1776 }
1777
1778 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1779 {
1780         struct net *net = sock_net(skb->sk);
1781         struct ifinfomsg *ifm;
1782         char ifname[IFNAMSIZ];
1783         struct nlattr *tb[IFLA_MAX+1];
1784         struct net_device *dev = NULL;
1785         struct sk_buff *nskb;
1786         int err;
1787
1788         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1789         if (err < 0)
1790                 return err;
1791
1792         if (tb[IFLA_IFNAME])
1793                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1794
1795         ifm = nlmsg_data(nlh);
1796         if (ifm->ifi_index > 0)
1797                 dev = __dev_get_by_index(net, ifm->ifi_index);
1798         else if (tb[IFLA_IFNAME])
1799                 dev = __dev_get_by_name(net, ifname);
1800         else
1801                 return -EINVAL;
1802
1803         if (dev == NULL)
1804                 return -ENODEV;
1805
1806         nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1807         if (nskb == NULL)
1808                 return -ENOBUFS;
1809
1810         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1811                                nlh->nlmsg_seq, 0, 0);
1812         if (err < 0) {
1813                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1814                 WARN_ON(err == -EMSGSIZE);
1815                 kfree_skb(nskb);
1816         } else
1817                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1818
1819         return err;
1820 }
1821
1822 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1823 {
1824         int idx;
1825         int s_idx = cb->family;
1826
1827         if (s_idx == 0)
1828                 s_idx = 1;
1829         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1830                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1831                 if (idx < s_idx || idx == PF_PACKET)
1832                         continue;
1833                 if (rtnl_msg_handlers[idx] == NULL ||
1834                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1835                         continue;
1836                 if (idx > s_idx)
1837                         memset(&cb->args[0], 0, sizeof(cb->args));
1838                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1839                         break;
1840         }
1841         cb->family = idx;
1842
1843         return skb->len;
1844 }
1845
1846 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1847 {
1848         struct net *net = dev_net(dev);
1849         struct sk_buff *skb;
1850         int err = -ENOBUFS;
1851
1852         skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1853         if (skb == NULL)
1854                 goto errout;
1855
1856         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1857         if (err < 0) {
1858                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1859                 WARN_ON(err == -EMSGSIZE);
1860                 kfree_skb(skb);
1861                 goto errout;
1862         }
1863         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1864         return;
1865 errout:
1866         if (err < 0)
1867                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1868 }
1869
1870 /* Protected by RTNL sempahore.  */
1871 static struct rtattr **rta_buf;
1872 static int rtattr_max;
1873
1874 /* Process one rtnetlink message. */
1875
1876 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1877 {
1878         struct net *net = sock_net(skb->sk);
1879         rtnl_doit_func doit;
1880         int sz_idx, kind;
1881         int min_len;
1882         int family;
1883         int type;
1884
1885         type = nlh->nlmsg_type;
1886         if (type > RTM_MAX)
1887                 return -EOPNOTSUPP;
1888
1889         type -= RTM_BASE;
1890
1891         /* All the messages must have at least 1 byte length */
1892         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1893                 return 0;
1894
1895         family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1896         sz_idx = type>>2;
1897         kind = type&3;
1898
1899         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1900                 return -EPERM;
1901
1902         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1903                 struct sock *rtnl;
1904                 rtnl_dumpit_func dumpit;
1905
1906                 dumpit = rtnl_get_dumpit(family, type);
1907                 if (dumpit == NULL)
1908                         return -EOPNOTSUPP;
1909
1910                 rtnl = net->rtnl;
1911                 return netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1912         }
1913
1914         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1915
1916         min_len = rtm_min[sz_idx];
1917         if (nlh->nlmsg_len < min_len)
1918                 return -EINVAL;
1919
1920         if (nlh->nlmsg_len > min_len) {
1921                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1922                 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1923
1924                 while (RTA_OK(attr, attrlen)) {
1925                         unsigned flavor = attr->rta_type;
1926                         if (flavor) {
1927                                 if (flavor > rta_max[sz_idx])
1928                                         return -EINVAL;
1929                                 rta_buf[flavor-1] = attr;
1930                         }
1931                         attr = RTA_NEXT(attr, attrlen);
1932                 }
1933         }
1934
1935         doit = rtnl_get_doit(family, type);
1936         if (doit == NULL)
1937                 return -EOPNOTSUPP;
1938
1939         return doit(skb, nlh, (void *)&rta_buf[0]);
1940 }
1941
1942 static void rtnetlink_rcv(struct sk_buff *skb)
1943 {
1944         rtnl_lock();
1945         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1946         rtnl_unlock();
1947 }
1948
1949 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1950 {
1951         struct net_device *dev = ptr;
1952
1953         switch (event) {
1954         case NETDEV_UP:
1955         case NETDEV_DOWN:
1956         case NETDEV_PRE_UP:
1957         case NETDEV_POST_INIT:
1958         case NETDEV_REGISTER:
1959         case NETDEV_CHANGE:
1960         case NETDEV_PRE_TYPE_CHANGE:
1961         case NETDEV_GOING_DOWN:
1962         case NETDEV_UNREGISTER:
1963         case NETDEV_UNREGISTER_BATCH:
1964                 break;
1965         default:
1966                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1967                 break;
1968         }
1969         return NOTIFY_DONE;
1970 }
1971
1972 static struct notifier_block rtnetlink_dev_notifier = {
1973         .notifier_call  = rtnetlink_event,
1974 };
1975
1976
1977 static int __net_init rtnetlink_net_init(struct net *net)
1978 {
1979         struct sock *sk;
1980         sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1981                                    rtnetlink_rcv, NULL, THIS_MODULE);
1982         if (!sk)
1983                 return -ENOMEM;
1984         net->rtnl = sk;
1985         return 0;
1986 }
1987
1988 static void __net_exit rtnetlink_net_exit(struct net *net)
1989 {
1990         netlink_kernel_release(net->rtnl);
1991         net->rtnl = NULL;
1992 }
1993
1994 static struct pernet_operations rtnetlink_net_ops = {
1995         .init = rtnetlink_net_init,
1996         .exit = rtnetlink_net_exit,
1997 };
1998
1999 void __init rtnetlink_init(void)
2000 {
2001         int i;
2002
2003         rtattr_max = 0;
2004         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2005                 if (rta_max[i] > rtattr_max)
2006                         rtattr_max = rta_max[i];
2007         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2008         if (!rta_buf)
2009                 panic("rtnetlink_init: cannot allocate rta_buf\n");
2010
2011         if (register_pernet_subsys(&rtnetlink_net_ops))
2012                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2013
2014         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2015         register_netdevice_notifier(&rtnetlink_dev_notifier);
2016
2017         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
2018         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
2019         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
2020         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
2021
2022         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
2023         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
2024 }
2025