606a6e8f3671defcc1eab21a471f0468f54f3359
[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         rtnl_calcit_func        calcit;
60 };
61
62 static DEFINE_MUTEX(rtnl_mutex);
63
64 void rtnl_lock(void)
65 {
66         mutex_lock(&rtnl_mutex);
67 }
68 EXPORT_SYMBOL(rtnl_lock);
69
70 void __rtnl_unlock(void)
71 {
72         mutex_unlock(&rtnl_mutex);
73 }
74
75 void rtnl_unlock(void)
76 {
77         /* This fellow will unlock it for us. */
78         netdev_run_todo();
79 }
80 EXPORT_SYMBOL(rtnl_unlock);
81
82 int rtnl_trylock(void)
83 {
84         return mutex_trylock(&rtnl_mutex);
85 }
86 EXPORT_SYMBOL(rtnl_trylock);
87
88 int rtnl_is_locked(void)
89 {
90         return mutex_is_locked(&rtnl_mutex);
91 }
92 EXPORT_SYMBOL(rtnl_is_locked);
93
94 #ifdef CONFIG_PROVE_LOCKING
95 int lockdep_rtnl_is_held(void)
96 {
97         return lockdep_is_held(&rtnl_mutex);
98 }
99 EXPORT_SYMBOL(lockdep_rtnl_is_held);
100 #endif /* #ifdef CONFIG_PROVE_LOCKING */
101
102 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
103
104 static inline int rtm_msgindex(int msgtype)
105 {
106         int msgindex = msgtype - RTM_BASE;
107
108         /*
109          * msgindex < 0 implies someone tried to register a netlink
110          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
111          * the message type has not been added to linux/rtnetlink.h
112          */
113         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
114
115         return msgindex;
116 }
117
118 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
119 {
120         struct rtnl_link *tab;
121
122         if (protocol <= RTNL_FAMILY_MAX)
123                 tab = rtnl_msg_handlers[protocol];
124         else
125                 tab = NULL;
126
127         if (tab == NULL || tab[msgindex].doit == NULL)
128                 tab = rtnl_msg_handlers[PF_UNSPEC];
129
130         return tab ? tab[msgindex].doit : NULL;
131 }
132
133 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
134 {
135         struct rtnl_link *tab;
136
137         if (protocol <= RTNL_FAMILY_MAX)
138                 tab = rtnl_msg_handlers[protocol];
139         else
140                 tab = NULL;
141
142         if (tab == NULL || tab[msgindex].dumpit == NULL)
143                 tab = rtnl_msg_handlers[PF_UNSPEC];
144
145         return tab ? tab[msgindex].dumpit : NULL;
146 }
147
148 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
149 {
150         struct rtnl_link *tab;
151
152         if (protocol <= RTNL_FAMILY_MAX)
153                 tab = rtnl_msg_handlers[protocol];
154         else
155                 tab = NULL;
156
157         if (tab == NULL || tab[msgindex].calcit == NULL)
158                 tab = rtnl_msg_handlers[PF_UNSPEC];
159
160         return tab ? tab[msgindex].calcit : NULL;
161 }
162
163 /**
164  * __rtnl_register - Register a rtnetlink message type
165  * @protocol: Protocol family or PF_UNSPEC
166  * @msgtype: rtnetlink message type
167  * @doit: Function pointer called for each request message
168  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
169  * @calcit: Function pointer to calc size of dump message
170  *
171  * Registers the specified function pointers (at least one of them has
172  * to be non-NULL) to be called whenever a request message for the
173  * specified protocol family and message type is received.
174  *
175  * The special protocol family PF_UNSPEC may be used to define fallback
176  * function pointers for the case when no entry for the specific protocol
177  * family exists.
178  *
179  * Returns 0 on success or a negative error code.
180  */
181 int __rtnl_register(int protocol, int msgtype,
182                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
183                     rtnl_calcit_func calcit)
184 {
185         struct rtnl_link *tab;
186         int msgindex;
187
188         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
189         msgindex = rtm_msgindex(msgtype);
190
191         tab = rtnl_msg_handlers[protocol];
192         if (tab == NULL) {
193                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
194                 if (tab == NULL)
195                         return -ENOBUFS;
196
197                 rtnl_msg_handlers[protocol] = tab;
198         }
199
200         if (doit)
201                 tab[msgindex].doit = doit;
202
203         if (dumpit)
204                 tab[msgindex].dumpit = dumpit;
205
206         if (calcit)
207                 tab[msgindex].calcit = calcit;
208
209         return 0;
210 }
211 EXPORT_SYMBOL_GPL(__rtnl_register);
212
213 /**
214  * rtnl_register - Register a rtnetlink message type
215  *
216  * Identical to __rtnl_register() but panics on failure. This is useful
217  * as failure of this function is very unlikely, it can only happen due
218  * to lack of memory when allocating the chain to store all message
219  * handlers for a protocol. Meant for use in init functions where lack
220  * of memory implies no sense in continuing.
221  */
222 void rtnl_register(int protocol, int msgtype,
223                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
224                    rtnl_calcit_func calcit)
225 {
226         if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
227                 panic("Unable to register rtnetlink message handler, "
228                       "protocol = %d, message type = %d\n",
229                       protocol, msgtype);
230 }
231 EXPORT_SYMBOL_GPL(rtnl_register);
232
233 /**
234  * rtnl_unregister - Unregister a rtnetlink message type
235  * @protocol: Protocol family or PF_UNSPEC
236  * @msgtype: rtnetlink message type
237  *
238  * Returns 0 on success or a negative error code.
239  */
240 int rtnl_unregister(int protocol, int msgtype)
241 {
242         int msgindex;
243
244         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
245         msgindex = rtm_msgindex(msgtype);
246
247         if (rtnl_msg_handlers[protocol] == NULL)
248                 return -ENOENT;
249
250         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
251         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
252
253         return 0;
254 }
255 EXPORT_SYMBOL_GPL(rtnl_unregister);
256
257 /**
258  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
259  * @protocol : Protocol family or PF_UNSPEC
260  *
261  * Identical to calling rtnl_unregster() for all registered message types
262  * of a certain protocol family.
263  */
264 void rtnl_unregister_all(int protocol)
265 {
266         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
267
268         kfree(rtnl_msg_handlers[protocol]);
269         rtnl_msg_handlers[protocol] = NULL;
270 }
271 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
272
273 static LIST_HEAD(link_ops);
274
275 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
276 {
277         const struct rtnl_link_ops *ops;
278
279         list_for_each_entry(ops, &link_ops, list) {
280                 if (!strcmp(ops->kind, kind))
281                         return ops;
282         }
283         return NULL;
284 }
285
286 /**
287  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
288  * @ops: struct rtnl_link_ops * to register
289  *
290  * The caller must hold the rtnl_mutex. This function should be used
291  * by drivers that create devices during module initialization. It
292  * must be called before registering the devices.
293  *
294  * Returns 0 on success or a negative error code.
295  */
296 int __rtnl_link_register(struct rtnl_link_ops *ops)
297 {
298         if (rtnl_link_ops_get(ops->kind))
299                 return -EEXIST;
300
301         if (!ops->dellink)
302                 ops->dellink = unregister_netdevice_queue;
303
304         list_add_tail(&ops->list, &link_ops);
305         return 0;
306 }
307 EXPORT_SYMBOL_GPL(__rtnl_link_register);
308
309 /**
310  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
311  * @ops: struct rtnl_link_ops * to register
312  *
313  * Returns 0 on success or a negative error code.
314  */
315 int rtnl_link_register(struct rtnl_link_ops *ops)
316 {
317         int err;
318
319         rtnl_lock();
320         err = __rtnl_link_register(ops);
321         rtnl_unlock();
322         return err;
323 }
324 EXPORT_SYMBOL_GPL(rtnl_link_register);
325
326 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
327 {
328         struct net_device *dev;
329         LIST_HEAD(list_kill);
330
331         for_each_netdev(net, dev) {
332                 if (dev->rtnl_link_ops == ops)
333                         ops->dellink(dev, &list_kill);
334         }
335         unregister_netdevice_many(&list_kill);
336 }
337
338 /**
339  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
340  * @ops: struct rtnl_link_ops * to unregister
341  *
342  * The caller must hold the rtnl_mutex.
343  */
344 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
345 {
346         struct net *net;
347
348         for_each_net(net) {
349                 __rtnl_kill_links(net, ops);
350         }
351         list_del(&ops->list);
352 }
353 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
354
355 /**
356  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
357  * @ops: struct rtnl_link_ops * to unregister
358  */
359 void rtnl_link_unregister(struct rtnl_link_ops *ops)
360 {
361         rtnl_lock();
362         __rtnl_link_unregister(ops);
363         rtnl_unlock();
364 }
365 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
366
367 static size_t rtnl_link_get_size(const struct net_device *dev)
368 {
369         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
370         size_t size;
371
372         if (!ops)
373                 return 0;
374
375         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
376                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
377
378         if (ops->get_size)
379                 /* IFLA_INFO_DATA + nested data */
380                 size += nla_total_size(sizeof(struct nlattr)) +
381                         ops->get_size(dev);
382
383         if (ops->get_xstats_size)
384                 /* IFLA_INFO_XSTATS */
385                 size += nla_total_size(ops->get_xstats_size(dev));
386
387         return size;
388 }
389
390 static LIST_HEAD(rtnl_af_ops);
391
392 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
393 {
394         const struct rtnl_af_ops *ops;
395
396         list_for_each_entry(ops, &rtnl_af_ops, list) {
397                 if (ops->family == family)
398                         return ops;
399         }
400
401         return NULL;
402 }
403
404 /**
405  * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
406  * @ops: struct rtnl_af_ops * to register
407  *
408  * The caller must hold the rtnl_mutex.
409  *
410  * Returns 0 on success or a negative error code.
411  */
412 int __rtnl_af_register(struct rtnl_af_ops *ops)
413 {
414         list_add_tail(&ops->list, &rtnl_af_ops);
415         return 0;
416 }
417 EXPORT_SYMBOL_GPL(__rtnl_af_register);
418
419 /**
420  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
421  * @ops: struct rtnl_af_ops * to register
422  *
423  * Returns 0 on success or a negative error code.
424  */
425 int rtnl_af_register(struct rtnl_af_ops *ops)
426 {
427         int err;
428
429         rtnl_lock();
430         err = __rtnl_af_register(ops);
431         rtnl_unlock();
432         return err;
433 }
434 EXPORT_SYMBOL_GPL(rtnl_af_register);
435
436 /**
437  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
438  * @ops: struct rtnl_af_ops * to unregister
439  *
440  * The caller must hold the rtnl_mutex.
441  */
442 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
443 {
444         list_del(&ops->list);
445 }
446 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
447
448 /**
449  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
450  * @ops: struct rtnl_af_ops * to unregister
451  */
452 void rtnl_af_unregister(struct rtnl_af_ops *ops)
453 {
454         rtnl_lock();
455         __rtnl_af_unregister(ops);
456         rtnl_unlock();
457 }
458 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
459
460 static size_t rtnl_link_get_af_size(const struct net_device *dev)
461 {
462         struct rtnl_af_ops *af_ops;
463         size_t size;
464
465         /* IFLA_AF_SPEC */
466         size = nla_total_size(sizeof(struct nlattr));
467
468         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
469                 if (af_ops->get_link_af_size) {
470                         /* AF_* + nested data */
471                         size += nla_total_size(sizeof(struct nlattr)) +
472                                 af_ops->get_link_af_size(dev);
473                 }
474         }
475
476         return size;
477 }
478
479 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
480 {
481         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
482         struct nlattr *linkinfo, *data;
483         int err = -EMSGSIZE;
484
485         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
486         if (linkinfo == NULL)
487                 goto out;
488
489         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
490                 goto err_cancel_link;
491         if (ops->fill_xstats) {
492                 err = ops->fill_xstats(skb, dev);
493                 if (err < 0)
494                         goto err_cancel_link;
495         }
496         if (ops->fill_info) {
497                 data = nla_nest_start(skb, IFLA_INFO_DATA);
498                 if (data == NULL)
499                         goto err_cancel_link;
500                 err = ops->fill_info(skb, dev);
501                 if (err < 0)
502                         goto err_cancel_data;
503                 nla_nest_end(skb, data);
504         }
505
506         nla_nest_end(skb, linkinfo);
507         return 0;
508
509 err_cancel_data:
510         nla_nest_cancel(skb, data);
511 err_cancel_link:
512         nla_nest_cancel(skb, linkinfo);
513 out:
514         return err;
515 }
516
517 static const int rtm_min[RTM_NR_FAMILIES] =
518 {
519         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
520         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
521         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
522         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
523         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
524         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
525         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
526         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
527         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
528         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
529 };
530
531 static const int rta_max[RTM_NR_FAMILIES] =
532 {
533         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
534         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
535         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
536         [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
537         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
538         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
539         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
540         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
541 };
542
543 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
544 {
545         struct rtattr *rta;
546         int size = RTA_LENGTH(attrlen);
547
548         rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
549         rta->rta_type = attrtype;
550         rta->rta_len = size;
551         memcpy(RTA_DATA(rta), data, attrlen);
552         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
553 }
554 EXPORT_SYMBOL(__rta_fill);
555
556 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
557 {
558         struct sock *rtnl = net->rtnl;
559         int err = 0;
560
561         NETLINK_CB(skb).dst_group = group;
562         if (echo)
563                 atomic_inc(&skb->users);
564         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
565         if (echo)
566                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
567         return err;
568 }
569
570 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
571 {
572         struct sock *rtnl = net->rtnl;
573
574         return nlmsg_unicast(rtnl, skb, pid);
575 }
576 EXPORT_SYMBOL(rtnl_unicast);
577
578 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
579                  struct nlmsghdr *nlh, gfp_t flags)
580 {
581         struct sock *rtnl = net->rtnl;
582         int report = 0;
583
584         if (nlh)
585                 report = nlmsg_report(nlh);
586
587         nlmsg_notify(rtnl, skb, pid, group, report, flags);
588 }
589 EXPORT_SYMBOL(rtnl_notify);
590
591 void rtnl_set_sk_err(struct net *net, u32 group, int error)
592 {
593         struct sock *rtnl = net->rtnl;
594
595         netlink_set_err(rtnl, 0, group, error);
596 }
597 EXPORT_SYMBOL(rtnl_set_sk_err);
598
599 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
600 {
601         struct nlattr *mx;
602         int i, valid = 0;
603
604         mx = nla_nest_start(skb, RTA_METRICS);
605         if (mx == NULL)
606                 return -ENOBUFS;
607
608         for (i = 0; i < RTAX_MAX; i++) {
609                 if (metrics[i]) {
610                         valid++;
611                         NLA_PUT_U32(skb, i+1, metrics[i]);
612                 }
613         }
614
615         if (!valid) {
616                 nla_nest_cancel(skb, mx);
617                 return 0;
618         }
619
620         return nla_nest_end(skb, mx);
621
622 nla_put_failure:
623         nla_nest_cancel(skb, mx);
624         return -EMSGSIZE;
625 }
626 EXPORT_SYMBOL(rtnetlink_put_metrics);
627
628 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
629                        u32 ts, u32 tsage, long expires, u32 error)
630 {
631         struct rta_cacheinfo ci = {
632                 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
633                 .rta_used = dst->__use,
634                 .rta_clntref = atomic_read(&(dst->__refcnt)),
635                 .rta_error = error,
636                 .rta_id =  id,
637                 .rta_ts = ts,
638                 .rta_tsage = tsage,
639         };
640
641         if (expires)
642                 ci.rta_expires = jiffies_to_clock_t(expires);
643
644         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
645 }
646 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
647
648 static void set_operstate(struct net_device *dev, unsigned char transition)
649 {
650         unsigned char operstate = dev->operstate;
651
652         switch (transition) {
653         case IF_OPER_UP:
654                 if ((operstate == IF_OPER_DORMANT ||
655                      operstate == IF_OPER_UNKNOWN) &&
656                     !netif_dormant(dev))
657                         operstate = IF_OPER_UP;
658                 break;
659
660         case IF_OPER_DORMANT:
661                 if (operstate == IF_OPER_UP ||
662                     operstate == IF_OPER_UNKNOWN)
663                         operstate = IF_OPER_DORMANT;
664                 break;
665         }
666
667         if (dev->operstate != operstate) {
668                 write_lock_bh(&dev_base_lock);
669                 dev->operstate = operstate;
670                 write_unlock_bh(&dev_base_lock);
671                 netdev_state_change(dev);
672         }
673 }
674
675 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
676                                            const struct ifinfomsg *ifm)
677 {
678         unsigned int flags = ifm->ifi_flags;
679
680         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
681         if (ifm->ifi_change)
682                 flags = (flags & ifm->ifi_change) |
683                         (dev->flags & ~ifm->ifi_change);
684
685         return flags;
686 }
687
688 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
689                                  const struct rtnl_link_stats64 *b)
690 {
691         a->rx_packets = b->rx_packets;
692         a->tx_packets = b->tx_packets;
693         a->rx_bytes = b->rx_bytes;
694         a->tx_bytes = b->tx_bytes;
695         a->rx_errors = b->rx_errors;
696         a->tx_errors = b->tx_errors;
697         a->rx_dropped = b->rx_dropped;
698         a->tx_dropped = b->tx_dropped;
699
700         a->multicast = b->multicast;
701         a->collisions = b->collisions;
702
703         a->rx_length_errors = b->rx_length_errors;
704         a->rx_over_errors = b->rx_over_errors;
705         a->rx_crc_errors = b->rx_crc_errors;
706         a->rx_frame_errors = b->rx_frame_errors;
707         a->rx_fifo_errors = b->rx_fifo_errors;
708         a->rx_missed_errors = b->rx_missed_errors;
709
710         a->tx_aborted_errors = b->tx_aborted_errors;
711         a->tx_carrier_errors = b->tx_carrier_errors;
712         a->tx_fifo_errors = b->tx_fifo_errors;
713         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
714         a->tx_window_errors = b->tx_window_errors;
715
716         a->rx_compressed = b->rx_compressed;
717         a->tx_compressed = b->tx_compressed;
718 }
719
720 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
721 {
722         memcpy(v, b, sizeof(*b));
723 }
724
725 /* All VF info */
726 static inline int rtnl_vfinfo_size(const struct net_device *dev,
727                                    u32 ext_filter_mask)
728 {
729         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
730             (ext_filter_mask & RTEXT_FILTER_VF)) {
731                 int num_vfs = dev_num_vf(dev->dev.parent);
732                 size_t size = nla_total_size(sizeof(struct nlattr));
733                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
734                 size += num_vfs *
735                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
736                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
737                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
738                          nla_total_size(sizeof(struct ifla_vf_spoofchk)));
739                 return size;
740         } else
741                 return 0;
742 }
743
744 static size_t rtnl_port_size(const struct net_device *dev)
745 {
746         size_t port_size = nla_total_size(4)            /* PORT_VF */
747                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
748                 + nla_total_size(sizeof(struct ifla_port_vsi))
749                                                         /* PORT_VSI_TYPE */
750                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
751                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
752                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
753                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
754         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
755         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
756                 + port_size;
757         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
758                 + port_size;
759
760         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
761                 return 0;
762         if (dev_num_vf(dev->dev.parent))
763                 return port_self_size + vf_ports_size +
764                         vf_port_size * dev_num_vf(dev->dev.parent);
765         else
766                 return port_self_size;
767 }
768
769 static noinline size_t if_nlmsg_size(const struct net_device *dev,
770                                      u32 ext_filter_mask)
771 {
772         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
773                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
774                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
775                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
776                + nla_total_size(sizeof(struct rtnl_link_ifmap))
777                + nla_total_size(sizeof(struct rtnl_link_stats))
778                + nla_total_size(sizeof(struct rtnl_link_stats64))
779                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
780                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
781                + nla_total_size(4) /* IFLA_TXQLEN */
782                + nla_total_size(4) /* IFLA_WEIGHT */
783                + nla_total_size(4) /* IFLA_MTU */
784                + nla_total_size(4) /* IFLA_LINK */
785                + nla_total_size(4) /* IFLA_MASTER */
786                + nla_total_size(1) /* IFLA_OPERSTATE */
787                + nla_total_size(1) /* IFLA_LINKMODE */
788                + nla_total_size(ext_filter_mask
789                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
790                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
791                + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
792                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
793                + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
794 }
795
796 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
797 {
798         struct nlattr *vf_ports;
799         struct nlattr *vf_port;
800         int vf;
801         int err;
802
803         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
804         if (!vf_ports)
805                 return -EMSGSIZE;
806
807         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
808                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
809                 if (!vf_port)
810                         goto nla_put_failure;
811                 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
812                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
813                 if (err == -EMSGSIZE)
814                         goto nla_put_failure;
815                 if (err) {
816                         nla_nest_cancel(skb, vf_port);
817                         continue;
818                 }
819                 nla_nest_end(skb, vf_port);
820         }
821
822         nla_nest_end(skb, vf_ports);
823
824         return 0;
825
826 nla_put_failure:
827         nla_nest_cancel(skb, vf_ports);
828         return -EMSGSIZE;
829 }
830
831 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
832 {
833         struct nlattr *port_self;
834         int err;
835
836         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
837         if (!port_self)
838                 return -EMSGSIZE;
839
840         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
841         if (err) {
842                 nla_nest_cancel(skb, port_self);
843                 return (err == -EMSGSIZE) ? err : 0;
844         }
845
846         nla_nest_end(skb, port_self);
847
848         return 0;
849 }
850
851 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
852 {
853         int err;
854
855         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
856                 return 0;
857
858         err = rtnl_port_self_fill(skb, dev);
859         if (err)
860                 return err;
861
862         if (dev_num_vf(dev->dev.parent)) {
863                 err = rtnl_vf_ports_fill(skb, dev);
864                 if (err)
865                         return err;
866         }
867
868         return 0;
869 }
870
871 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
872                             int type, u32 pid, u32 seq, u32 change,
873                             unsigned int flags, u32 ext_filter_mask)
874 {
875         struct ifinfomsg *ifm;
876         struct nlmsghdr *nlh;
877         struct rtnl_link_stats64 temp;
878         const struct rtnl_link_stats64 *stats;
879         struct nlattr *attr, *af_spec;
880         struct rtnl_af_ops *af_ops;
881
882         ASSERT_RTNL();
883         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
884         if (nlh == NULL)
885                 return -EMSGSIZE;
886
887         ifm = nlmsg_data(nlh);
888         ifm->ifi_family = AF_UNSPEC;
889         ifm->__ifi_pad = 0;
890         ifm->ifi_type = dev->type;
891         ifm->ifi_index = dev->ifindex;
892         ifm->ifi_flags = dev_get_flags(dev);
893         ifm->ifi_change = change;
894
895         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
896         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
897         NLA_PUT_U8(skb, IFLA_OPERSTATE,
898                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
899         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
900         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
901         NLA_PUT_U32(skb, IFLA_GROUP, dev->group);
902
903         if (dev->ifindex != dev->iflink)
904                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
905
906         if (dev->master)
907                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
908
909         if (dev->qdisc)
910                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
911
912         if (dev->ifalias)
913                 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
914
915         if (1) {
916                 struct rtnl_link_ifmap map = {
917                         .mem_start   = dev->mem_start,
918                         .mem_end     = dev->mem_end,
919                         .base_addr   = dev->base_addr,
920                         .irq         = dev->irq,
921                         .dma         = dev->dma,
922                         .port        = dev->if_port,
923                 };
924                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
925         }
926
927         if (dev->addr_len) {
928                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
929                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
930         }
931
932         attr = nla_reserve(skb, IFLA_STATS,
933                         sizeof(struct rtnl_link_stats));
934         if (attr == NULL)
935                 goto nla_put_failure;
936
937         stats = dev_get_stats(dev, &temp);
938         copy_rtnl_link_stats(nla_data(attr), stats);
939
940         attr = nla_reserve(skb, IFLA_STATS64,
941                         sizeof(struct rtnl_link_stats64));
942         if (attr == NULL)
943                 goto nla_put_failure;
944         copy_rtnl_link_stats64(nla_data(attr), stats);
945
946         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF))
947                 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
948
949         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
950             && (ext_filter_mask & RTEXT_FILTER_VF)) {
951                 int i;
952
953                 struct nlattr *vfinfo, *vf;
954                 int num_vfs = dev_num_vf(dev->dev.parent);
955
956                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
957                 if (!vfinfo)
958                         goto nla_put_failure;
959                 for (i = 0; i < num_vfs; i++) {
960                         struct ifla_vf_info ivi;
961                         struct ifla_vf_mac vf_mac;
962                         struct ifla_vf_vlan vf_vlan;
963                         struct ifla_vf_tx_rate vf_tx_rate;
964                         struct ifla_vf_spoofchk vf_spoofchk;
965
966                         /*
967                          * Not all SR-IOV capable drivers support the
968                          * spoofcheck query.  Preset to -1 so the user
969                          * space tool can detect that the driver didn't
970                          * report anything.
971                          */
972                         ivi.spoofchk = -1;
973                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
974                                 break;
975                         vf_mac.vf =
976                                 vf_vlan.vf =
977                                 vf_tx_rate.vf =
978                                 vf_spoofchk.vf = ivi.vf;
979
980                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
981                         vf_vlan.vlan = ivi.vlan;
982                         vf_vlan.qos = ivi.qos;
983                         vf_tx_rate.rate = ivi.tx_rate;
984                         vf_spoofchk.setting = ivi.spoofchk;
985                         vf = nla_nest_start(skb, IFLA_VF_INFO);
986                         if (!vf) {
987                                 nla_nest_cancel(skb, vfinfo);
988                                 goto nla_put_failure;
989                         }
990                         NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
991                         NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
992                         NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
993                                 &vf_tx_rate);
994                         NLA_PUT(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
995                                 &vf_spoofchk);
996                         nla_nest_end(skb, vf);
997                 }
998                 nla_nest_end(skb, vfinfo);
999         }
1000
1001         if (rtnl_port_fill(skb, dev))
1002                 goto nla_put_failure;
1003
1004         if (dev->rtnl_link_ops) {
1005                 if (rtnl_link_fill(skb, dev) < 0)
1006                         goto nla_put_failure;
1007         }
1008
1009         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1010                 goto nla_put_failure;
1011
1012         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1013                 if (af_ops->fill_link_af) {
1014                         struct nlattr *af;
1015                         int err;
1016
1017                         if (!(af = nla_nest_start(skb, af_ops->family)))
1018                                 goto nla_put_failure;
1019
1020                         err = af_ops->fill_link_af(skb, dev);
1021
1022                         /*
1023                          * Caller may return ENODATA to indicate that there
1024                          * was no data to be dumped. This is not an error, it
1025                          * means we should trim the attribute header and
1026                          * continue.
1027                          */
1028                         if (err == -ENODATA)
1029                                 nla_nest_cancel(skb, af);
1030                         else if (err < 0)
1031                                 goto nla_put_failure;
1032
1033                         nla_nest_end(skb, af);
1034                 }
1035         }
1036
1037         nla_nest_end(skb, af_spec);
1038
1039         return nlmsg_end(skb, nlh);
1040
1041 nla_put_failure:
1042         nlmsg_cancel(skb, nlh);
1043         return -EMSGSIZE;
1044 }
1045
1046 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1047 {
1048         struct net *net = sock_net(skb->sk);
1049         int h, s_h;
1050         int idx = 0, s_idx;
1051         struct net_device *dev;
1052         struct hlist_head *head;
1053         struct hlist_node *node;
1054         struct nlattr *tb[IFLA_MAX+1];
1055         u32 ext_filter_mask = 0;
1056
1057         s_h = cb->args[0];
1058         s_idx = cb->args[1];
1059
1060         rcu_read_lock();
1061         cb->seq = net->dev_base_seq;
1062
1063         nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1064                     ifla_policy);
1065
1066         if (tb[IFLA_EXT_MASK])
1067                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1068
1069         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1070                 idx = 0;
1071                 head = &net->dev_index_head[h];
1072                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1073                         if (idx < s_idx)
1074                                 goto cont;
1075                         if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1076                                              NETLINK_CB(cb->skb).pid,
1077                                              cb->nlh->nlmsg_seq, 0,
1078                                              NLM_F_MULTI,
1079                                              ext_filter_mask) <= 0)
1080                                 goto out;
1081
1082                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1083 cont:
1084                         idx++;
1085                 }
1086         }
1087 out:
1088         rcu_read_unlock();
1089         cb->args[1] = idx;
1090         cb->args[0] = h;
1091
1092         return skb->len;
1093 }
1094
1095 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1096         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1097         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1098         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1099         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1100         [IFLA_MTU]              = { .type = NLA_U32 },
1101         [IFLA_LINK]             = { .type = NLA_U32 },
1102         [IFLA_MASTER]           = { .type = NLA_U32 },
1103         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1104         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1105         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1106         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1107         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1108         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1109         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1110         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1111         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1112         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1113         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1114         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1115         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1116 };
1117 EXPORT_SYMBOL(ifla_policy);
1118
1119 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1120         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1121         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1122 };
1123
1124 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1125         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1126 };
1127
1128 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1129         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1130                                     .len = sizeof(struct ifla_vf_mac) },
1131         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1132                                     .len = sizeof(struct ifla_vf_vlan) },
1133         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1134                                     .len = sizeof(struct ifla_vf_tx_rate) },
1135 };
1136
1137 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1138         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1139         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1140                                     .len = PORT_PROFILE_MAX },
1141         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1142                                     .len = sizeof(struct ifla_port_vsi)},
1143         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1144                                       .len = PORT_UUID_MAX },
1145         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1146                                     .len = PORT_UUID_MAX },
1147         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1148         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1149 };
1150
1151 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1152 {
1153         struct net *net;
1154         /* Examine the link attributes and figure out which
1155          * network namespace we are talking about.
1156          */
1157         if (tb[IFLA_NET_NS_PID])
1158                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1159         else if (tb[IFLA_NET_NS_FD])
1160                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1161         else
1162                 net = get_net(src_net);
1163         return net;
1164 }
1165 EXPORT_SYMBOL(rtnl_link_get_net);
1166
1167 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1168 {
1169         if (dev) {
1170                 if (tb[IFLA_ADDRESS] &&
1171                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1172                         return -EINVAL;
1173
1174                 if (tb[IFLA_BROADCAST] &&
1175                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1176                         return -EINVAL;
1177         }
1178
1179         if (tb[IFLA_AF_SPEC]) {
1180                 struct nlattr *af;
1181                 int rem, err;
1182
1183                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1184                         const struct rtnl_af_ops *af_ops;
1185
1186                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1187                                 return -EAFNOSUPPORT;
1188
1189                         if (!af_ops->set_link_af)
1190                                 return -EOPNOTSUPP;
1191
1192                         if (af_ops->validate_link_af) {
1193                                 err = af_ops->validate_link_af(dev, af);
1194                                 if (err < 0)
1195                                         return err;
1196                         }
1197                 }
1198         }
1199
1200         return 0;
1201 }
1202
1203 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1204 {
1205         int rem, err = -EINVAL;
1206         struct nlattr *vf;
1207         const struct net_device_ops *ops = dev->netdev_ops;
1208
1209         nla_for_each_nested(vf, attr, rem) {
1210                 switch (nla_type(vf)) {
1211                 case IFLA_VF_MAC: {
1212                         struct ifla_vf_mac *ivm;
1213                         ivm = nla_data(vf);
1214                         err = -EOPNOTSUPP;
1215                         if (ops->ndo_set_vf_mac)
1216                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1217                                                           ivm->mac);
1218                         break;
1219                 }
1220                 case IFLA_VF_VLAN: {
1221                         struct ifla_vf_vlan *ivv;
1222                         ivv = nla_data(vf);
1223                         err = -EOPNOTSUPP;
1224                         if (ops->ndo_set_vf_vlan)
1225                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1226                                                            ivv->vlan,
1227                                                            ivv->qos);
1228                         break;
1229                 }
1230                 case IFLA_VF_TX_RATE: {
1231                         struct ifla_vf_tx_rate *ivt;
1232                         ivt = nla_data(vf);
1233                         err = -EOPNOTSUPP;
1234                         if (ops->ndo_set_vf_tx_rate)
1235                                 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1236                                                               ivt->rate);
1237                         break;
1238                 }
1239                 case IFLA_VF_SPOOFCHK: {
1240                         struct ifla_vf_spoofchk *ivs;
1241                         ivs = nla_data(vf);
1242                         err = -EOPNOTSUPP;
1243                         if (ops->ndo_set_vf_spoofchk)
1244                                 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1245                                                                ivs->setting);
1246                         break;
1247                 }
1248                 default:
1249                         err = -EINVAL;
1250                         break;
1251                 }
1252                 if (err)
1253                         break;
1254         }
1255         return err;
1256 }
1257
1258 static int do_set_master(struct net_device *dev, int ifindex)
1259 {
1260         struct net_device *master_dev;
1261         const struct net_device_ops *ops;
1262         int err;
1263
1264         if (dev->master) {
1265                 if (dev->master->ifindex == ifindex)
1266                         return 0;
1267                 ops = dev->master->netdev_ops;
1268                 if (ops->ndo_del_slave) {
1269                         err = ops->ndo_del_slave(dev->master, dev);
1270                         if (err)
1271                                 return err;
1272                 } else {
1273                         return -EOPNOTSUPP;
1274                 }
1275         }
1276
1277         if (ifindex) {
1278                 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1279                 if (!master_dev)
1280                         return -EINVAL;
1281                 ops = master_dev->netdev_ops;
1282                 if (ops->ndo_add_slave) {
1283                         err = ops->ndo_add_slave(master_dev, dev);
1284                         if (err)
1285                                 return err;
1286                 } else {
1287                         return -EOPNOTSUPP;
1288                 }
1289         }
1290         return 0;
1291 }
1292
1293 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1294                       struct nlattr **tb, char *ifname, int modified)
1295 {
1296         const struct net_device_ops *ops = dev->netdev_ops;
1297         int send_addr_notify = 0;
1298         int err;
1299
1300         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1301                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1302                 if (IS_ERR(net)) {
1303                         err = PTR_ERR(net);
1304                         goto errout;
1305                 }
1306                 err = dev_change_net_namespace(dev, net, ifname);
1307                 put_net(net);
1308                 if (err)
1309                         goto errout;
1310                 modified = 1;
1311         }
1312
1313         if (tb[IFLA_MAP]) {
1314                 struct rtnl_link_ifmap *u_map;
1315                 struct ifmap k_map;
1316
1317                 if (!ops->ndo_set_config) {
1318                         err = -EOPNOTSUPP;
1319                         goto errout;
1320                 }
1321
1322                 if (!netif_device_present(dev)) {
1323                         err = -ENODEV;
1324                         goto errout;
1325                 }
1326
1327                 u_map = nla_data(tb[IFLA_MAP]);
1328                 k_map.mem_start = (unsigned long) u_map->mem_start;
1329                 k_map.mem_end = (unsigned long) u_map->mem_end;
1330                 k_map.base_addr = (unsigned short) u_map->base_addr;
1331                 k_map.irq = (unsigned char) u_map->irq;
1332                 k_map.dma = (unsigned char) u_map->dma;
1333                 k_map.port = (unsigned char) u_map->port;
1334
1335                 err = ops->ndo_set_config(dev, &k_map);
1336                 if (err < 0)
1337                         goto errout;
1338
1339                 modified = 1;
1340         }
1341
1342         if (tb[IFLA_ADDRESS]) {
1343                 struct sockaddr *sa;
1344                 int len;
1345
1346                 if (!ops->ndo_set_mac_address) {
1347                         err = -EOPNOTSUPP;
1348                         goto errout;
1349                 }
1350
1351                 if (!netif_device_present(dev)) {
1352                         err = -ENODEV;
1353                         goto errout;
1354                 }
1355
1356                 len = sizeof(sa_family_t) + dev->addr_len;
1357                 sa = kmalloc(len, GFP_KERNEL);
1358                 if (!sa) {
1359                         err = -ENOMEM;
1360                         goto errout;
1361                 }
1362                 sa->sa_family = dev->type;
1363                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1364                        dev->addr_len);
1365                 err = ops->ndo_set_mac_address(dev, sa);
1366                 kfree(sa);
1367                 if (err)
1368                         goto errout;
1369                 send_addr_notify = 1;
1370                 modified = 1;
1371         }
1372
1373         if (tb[IFLA_MTU]) {
1374                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1375                 if (err < 0)
1376                         goto errout;
1377                 modified = 1;
1378         }
1379
1380         if (tb[IFLA_GROUP]) {
1381                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1382                 modified = 1;
1383         }
1384
1385         /*
1386          * Interface selected by interface index but interface
1387          * name provided implies that a name change has been
1388          * requested.
1389          */
1390         if (ifm->ifi_index > 0 && ifname[0]) {
1391                 err = dev_change_name(dev, ifname);
1392                 if (err < 0)
1393                         goto errout;
1394                 modified = 1;
1395         }
1396
1397         if (tb[IFLA_IFALIAS]) {
1398                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1399                                     nla_len(tb[IFLA_IFALIAS]));
1400                 if (err < 0)
1401                         goto errout;
1402                 modified = 1;
1403         }
1404
1405         if (tb[IFLA_BROADCAST]) {
1406                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1407                 send_addr_notify = 1;
1408         }
1409
1410         if (ifm->ifi_flags || ifm->ifi_change) {
1411                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1412                 if (err < 0)
1413                         goto errout;
1414         }
1415
1416         if (tb[IFLA_MASTER]) {
1417                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1418                 if (err)
1419                         goto errout;
1420                 modified = 1;
1421         }
1422
1423         if (tb[IFLA_TXQLEN])
1424                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1425
1426         if (tb[IFLA_OPERSTATE])
1427                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1428
1429         if (tb[IFLA_LINKMODE]) {
1430                 write_lock_bh(&dev_base_lock);
1431                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1432                 write_unlock_bh(&dev_base_lock);
1433         }
1434
1435         if (tb[IFLA_VFINFO_LIST]) {
1436                 struct nlattr *attr;
1437                 int rem;
1438                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1439                         if (nla_type(attr) != IFLA_VF_INFO) {
1440                                 err = -EINVAL;
1441                                 goto errout;
1442                         }
1443                         err = do_setvfinfo(dev, attr);
1444                         if (err < 0)
1445                                 goto errout;
1446                         modified = 1;
1447                 }
1448         }
1449         err = 0;
1450
1451         if (tb[IFLA_VF_PORTS]) {
1452                 struct nlattr *port[IFLA_PORT_MAX+1];
1453                 struct nlattr *attr;
1454                 int vf;
1455                 int rem;
1456
1457                 err = -EOPNOTSUPP;
1458                 if (!ops->ndo_set_vf_port)
1459                         goto errout;
1460
1461                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1462                         if (nla_type(attr) != IFLA_VF_PORT)
1463                                 continue;
1464                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1465                                 attr, ifla_port_policy);
1466                         if (err < 0)
1467                                 goto errout;
1468                         if (!port[IFLA_PORT_VF]) {
1469                                 err = -EOPNOTSUPP;
1470                                 goto errout;
1471                         }
1472                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1473                         err = ops->ndo_set_vf_port(dev, vf, port);
1474                         if (err < 0)
1475                                 goto errout;
1476                         modified = 1;
1477                 }
1478         }
1479         err = 0;
1480
1481         if (tb[IFLA_PORT_SELF]) {
1482                 struct nlattr *port[IFLA_PORT_MAX+1];
1483
1484                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1485                         tb[IFLA_PORT_SELF], ifla_port_policy);
1486                 if (err < 0)
1487                         goto errout;
1488
1489                 err = -EOPNOTSUPP;
1490                 if (ops->ndo_set_vf_port)
1491                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1492                 if (err < 0)
1493                         goto errout;
1494                 modified = 1;
1495         }
1496
1497         if (tb[IFLA_AF_SPEC]) {
1498                 struct nlattr *af;
1499                 int rem;
1500
1501                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1502                         const struct rtnl_af_ops *af_ops;
1503
1504                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1505                                 BUG();
1506
1507                         err = af_ops->set_link_af(dev, af);
1508                         if (err < 0)
1509                                 goto errout;
1510
1511                         modified = 1;
1512                 }
1513         }
1514         err = 0;
1515
1516 errout:
1517         if (err < 0 && modified && net_ratelimit())
1518                 printk(KERN_WARNING "A link change request failed with "
1519                        "some changes committed already. Interface %s may "
1520                        "have been left with an inconsistent configuration, "
1521                        "please check.\n", dev->name);
1522
1523         if (send_addr_notify)
1524                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1525
1526         return err;
1527 }
1528
1529 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1530 {
1531         struct net *net = sock_net(skb->sk);
1532         struct ifinfomsg *ifm;
1533         struct net_device *dev;
1534         int err;
1535         struct nlattr *tb[IFLA_MAX+1];
1536         char ifname[IFNAMSIZ];
1537
1538         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1539         if (err < 0)
1540                 goto errout;
1541
1542         if (tb[IFLA_IFNAME])
1543                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1544         else
1545                 ifname[0] = '\0';
1546
1547         err = -EINVAL;
1548         ifm = nlmsg_data(nlh);
1549         if (ifm->ifi_index > 0)
1550                 dev = __dev_get_by_index(net, ifm->ifi_index);
1551         else if (tb[IFLA_IFNAME])
1552                 dev = __dev_get_by_name(net, ifname);
1553         else
1554                 goto errout;
1555
1556         if (dev == NULL) {
1557                 err = -ENODEV;
1558                 goto errout;
1559         }
1560
1561         err = validate_linkmsg(dev, tb);
1562         if (err < 0)
1563                 goto errout;
1564
1565         err = do_setlink(dev, ifm, tb, ifname, 0);
1566 errout:
1567         return err;
1568 }
1569
1570 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1571 {
1572         struct net *net = sock_net(skb->sk);
1573         const struct rtnl_link_ops *ops;
1574         struct net_device *dev;
1575         struct ifinfomsg *ifm;
1576         char ifname[IFNAMSIZ];
1577         struct nlattr *tb[IFLA_MAX+1];
1578         int err;
1579         LIST_HEAD(list_kill);
1580
1581         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1582         if (err < 0)
1583                 return err;
1584
1585         if (tb[IFLA_IFNAME])
1586                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1587
1588         ifm = nlmsg_data(nlh);
1589         if (ifm->ifi_index > 0)
1590                 dev = __dev_get_by_index(net, ifm->ifi_index);
1591         else if (tb[IFLA_IFNAME])
1592                 dev = __dev_get_by_name(net, ifname);
1593         else
1594                 return -EINVAL;
1595
1596         if (!dev)
1597                 return -ENODEV;
1598
1599         ops = dev->rtnl_link_ops;
1600         if (!ops)
1601                 return -EOPNOTSUPP;
1602
1603         ops->dellink(dev, &list_kill);
1604         unregister_netdevice_many(&list_kill);
1605         list_del(&list_kill);
1606         return 0;
1607 }
1608
1609 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1610 {
1611         unsigned int old_flags;
1612         int err;
1613
1614         old_flags = dev->flags;
1615         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1616                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1617                 if (err < 0)
1618                         return err;
1619         }
1620
1621         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1622         rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1623
1624         __dev_notify_flags(dev, old_flags);
1625         return 0;
1626 }
1627 EXPORT_SYMBOL(rtnl_configure_link);
1628
1629 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1630         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1631 {
1632         int err;
1633         struct net_device *dev;
1634         unsigned int num_queues = 1;
1635         unsigned int real_num_queues = 1;
1636
1637         if (ops->get_tx_queues) {
1638                 err = ops->get_tx_queues(src_net, tb, &num_queues,
1639                                          &real_num_queues);
1640                 if (err)
1641                         goto err;
1642         }
1643         err = -ENOMEM;
1644         dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1645         if (!dev)
1646                 goto err;
1647
1648         dev_net_set(dev, net);
1649         dev->rtnl_link_ops = ops;
1650         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1651
1652         if (tb[IFLA_MTU])
1653                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1654         if (tb[IFLA_ADDRESS])
1655                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1656                                 nla_len(tb[IFLA_ADDRESS]));
1657         if (tb[IFLA_BROADCAST])
1658                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1659                                 nla_len(tb[IFLA_BROADCAST]));
1660         if (tb[IFLA_TXQLEN])
1661                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1662         if (tb[IFLA_OPERSTATE])
1663                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1664         if (tb[IFLA_LINKMODE])
1665                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1666         if (tb[IFLA_GROUP])
1667                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1668
1669         return dev;
1670
1671 err:
1672         return ERR_PTR(err);
1673 }
1674 EXPORT_SYMBOL(rtnl_create_link);
1675
1676 static int rtnl_group_changelink(struct net *net, int group,
1677                 struct ifinfomsg *ifm,
1678                 struct nlattr **tb)
1679 {
1680         struct net_device *dev;
1681         int err;
1682
1683         for_each_netdev(net, dev) {
1684                 if (dev->group == group) {
1685                         err = do_setlink(dev, ifm, tb, NULL, 0);
1686                         if (err < 0)
1687                                 return err;
1688                 }
1689         }
1690
1691         return 0;
1692 }
1693
1694 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1695 {
1696         struct net *net = sock_net(skb->sk);
1697         const struct rtnl_link_ops *ops;
1698         struct net_device *dev;
1699         struct ifinfomsg *ifm;
1700         char kind[MODULE_NAME_LEN];
1701         char ifname[IFNAMSIZ];
1702         struct nlattr *tb[IFLA_MAX+1];
1703         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1704         int err;
1705
1706 #ifdef CONFIG_MODULES
1707 replay:
1708 #endif
1709         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1710         if (err < 0)
1711                 return err;
1712
1713         if (tb[IFLA_IFNAME])
1714                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1715         else
1716                 ifname[0] = '\0';
1717
1718         ifm = nlmsg_data(nlh);
1719         if (ifm->ifi_index > 0)
1720                 dev = __dev_get_by_index(net, ifm->ifi_index);
1721         else {
1722                 if (ifname[0])
1723                         dev = __dev_get_by_name(net, ifname);
1724                 else
1725                         dev = NULL;
1726         }
1727
1728         err = validate_linkmsg(dev, tb);
1729         if (err < 0)
1730                 return err;
1731
1732         if (tb[IFLA_LINKINFO]) {
1733                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1734                                        tb[IFLA_LINKINFO], ifla_info_policy);
1735                 if (err < 0)
1736                         return err;
1737         } else
1738                 memset(linkinfo, 0, sizeof(linkinfo));
1739
1740         if (linkinfo[IFLA_INFO_KIND]) {
1741                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1742                 ops = rtnl_link_ops_get(kind);
1743         } else {
1744                 kind[0] = '\0';
1745                 ops = NULL;
1746         }
1747
1748         if (1) {
1749                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1750                 struct net *dest_net;
1751
1752                 if (ops) {
1753                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1754                                 err = nla_parse_nested(attr, ops->maxtype,
1755                                                        linkinfo[IFLA_INFO_DATA],
1756                                                        ops->policy);
1757                                 if (err < 0)
1758                                         return err;
1759                                 data = attr;
1760                         }
1761                         if (ops->validate) {
1762                                 err = ops->validate(tb, data);
1763                                 if (err < 0)
1764                                         return err;
1765                         }
1766                 }
1767
1768                 if (dev) {
1769                         int modified = 0;
1770
1771                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1772                                 return -EEXIST;
1773                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1774                                 return -EOPNOTSUPP;
1775
1776                         if (linkinfo[IFLA_INFO_DATA]) {
1777                                 if (!ops || ops != dev->rtnl_link_ops ||
1778                                     !ops->changelink)
1779                                         return -EOPNOTSUPP;
1780
1781                                 err = ops->changelink(dev, tb, data);
1782                                 if (err < 0)
1783                                         return err;
1784                                 modified = 1;
1785                         }
1786
1787                         return do_setlink(dev, ifm, tb, ifname, modified);
1788                 }
1789
1790                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1791                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1792                                 return rtnl_group_changelink(net,
1793                                                 nla_get_u32(tb[IFLA_GROUP]),
1794                                                 ifm, tb);
1795                         return -ENODEV;
1796                 }
1797
1798                 if (ifm->ifi_index)
1799                         return -EOPNOTSUPP;
1800                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1801                         return -EOPNOTSUPP;
1802
1803                 if (!ops) {
1804 #ifdef CONFIG_MODULES
1805                         if (kind[0]) {
1806                                 __rtnl_unlock();
1807                                 request_module("rtnl-link-%s", kind);
1808                                 rtnl_lock();
1809                                 ops = rtnl_link_ops_get(kind);
1810                                 if (ops)
1811                                         goto replay;
1812                         }
1813 #endif
1814                         return -EOPNOTSUPP;
1815                 }
1816
1817                 if (!ifname[0])
1818                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1819
1820                 dest_net = rtnl_link_get_net(net, tb);
1821                 if (IS_ERR(dest_net))
1822                         return PTR_ERR(dest_net);
1823
1824                 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1825
1826                 if (IS_ERR(dev))
1827                         err = PTR_ERR(dev);
1828                 else if (ops->newlink)
1829                         err = ops->newlink(net, dev, tb, data);
1830                 else
1831                         err = register_netdevice(dev);
1832
1833                 if (err < 0 && !IS_ERR(dev))
1834                         free_netdev(dev);
1835                 if (err < 0)
1836                         goto out;
1837
1838                 err = rtnl_configure_link(dev, ifm);
1839                 if (err < 0)
1840                         unregister_netdevice(dev);
1841 out:
1842                 put_net(dest_net);
1843                 return err;
1844         }
1845 }
1846
1847 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1848 {
1849         struct net *net = sock_net(skb->sk);
1850         struct ifinfomsg *ifm;
1851         char ifname[IFNAMSIZ];
1852         struct nlattr *tb[IFLA_MAX+1];
1853         struct net_device *dev = NULL;
1854         struct sk_buff *nskb;
1855         int err;
1856         u32 ext_filter_mask = 0;
1857
1858         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1859         if (err < 0)
1860                 return err;
1861
1862         if (tb[IFLA_IFNAME])
1863                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1864
1865         if (tb[IFLA_EXT_MASK])
1866                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1867
1868         ifm = nlmsg_data(nlh);
1869         if (ifm->ifi_index > 0)
1870                 dev = __dev_get_by_index(net, ifm->ifi_index);
1871         else if (tb[IFLA_IFNAME])
1872                 dev = __dev_get_by_name(net, ifname);
1873         else
1874                 return -EINVAL;
1875
1876         if (dev == NULL)
1877                 return -ENODEV;
1878
1879         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1880         if (nskb == NULL)
1881                 return -ENOBUFS;
1882
1883         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1884                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1885         if (err < 0) {
1886                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1887                 WARN_ON(err == -EMSGSIZE);
1888                 kfree_skb(nskb);
1889         } else
1890                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1891
1892         return err;
1893 }
1894
1895 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1896 {
1897         struct net *net = sock_net(skb->sk);
1898         struct net_device *dev;
1899         struct nlattr *tb[IFLA_MAX+1];
1900         u32 ext_filter_mask = 0;
1901         u16 min_ifinfo_dump_size = 0;
1902
1903         nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, ifla_policy);
1904
1905         if (tb[IFLA_EXT_MASK])
1906                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1907
1908         if (!ext_filter_mask)
1909                 return NLMSG_GOODSIZE;
1910         /*
1911          * traverse the list of net devices and compute the minimum
1912          * buffer size based upon the filter mask.
1913          */
1914         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1915                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1916                                              if_nlmsg_size(dev,
1917                                                            ext_filter_mask));
1918         }
1919
1920         return min_ifinfo_dump_size;
1921 }
1922
1923 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1924 {
1925         int idx;
1926         int s_idx = cb->family;
1927
1928         if (s_idx == 0)
1929                 s_idx = 1;
1930         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1931                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1932                 if (idx < s_idx || idx == PF_PACKET)
1933                         continue;
1934                 if (rtnl_msg_handlers[idx] == NULL ||
1935                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1936                         continue;
1937                 if (idx > s_idx)
1938                         memset(&cb->args[0], 0, sizeof(cb->args));
1939                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1940                         break;
1941         }
1942         cb->family = idx;
1943
1944         return skb->len;
1945 }
1946
1947 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1948 {
1949         struct net *net = dev_net(dev);
1950         struct sk_buff *skb;
1951         int err = -ENOBUFS;
1952         size_t if_info_size;
1953
1954         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1955         if (skb == NULL)
1956                 goto errout;
1957
1958         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
1959         if (err < 0) {
1960                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1961                 WARN_ON(err == -EMSGSIZE);
1962                 kfree_skb(skb);
1963                 goto errout;
1964         }
1965         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1966         return;
1967 errout:
1968         if (err < 0)
1969                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1970 }
1971
1972 /* Protected by RTNL sempahore.  */
1973 static struct rtattr **rta_buf;
1974 static int rtattr_max;
1975
1976 /* Process one rtnetlink message. */
1977
1978 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1979 {
1980         struct net *net = sock_net(skb->sk);
1981         rtnl_doit_func doit;
1982         int sz_idx, kind;
1983         int min_len;
1984         int family;
1985         int type;
1986         int err;
1987
1988         type = nlh->nlmsg_type;
1989         if (type > RTM_MAX)
1990                 return -EOPNOTSUPP;
1991
1992         type -= RTM_BASE;
1993
1994         /* All the messages must have at least 1 byte length */
1995         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1996                 return 0;
1997
1998         family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1999         sz_idx = type>>2;
2000         kind = type&3;
2001
2002         if (kind != 2 && !capable(CAP_NET_ADMIN))
2003                 return -EPERM;
2004
2005         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2006                 struct sock *rtnl;
2007                 rtnl_dumpit_func dumpit;
2008                 rtnl_calcit_func calcit;
2009                 u16 min_dump_alloc = 0;
2010
2011                 dumpit = rtnl_get_dumpit(family, type);
2012                 if (dumpit == NULL)
2013                         return -EOPNOTSUPP;
2014                 calcit = rtnl_get_calcit(family, type);
2015                 if (calcit)
2016                         min_dump_alloc = calcit(skb, nlh);
2017
2018                 __rtnl_unlock();
2019                 rtnl = net->rtnl;
2020                 err = netlink_dump_start(rtnl, skb, nlh, dumpit,
2021                                          NULL, min_dump_alloc);
2022                 rtnl_lock();
2023                 return err;
2024         }
2025
2026         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
2027
2028         min_len = rtm_min[sz_idx];
2029         if (nlh->nlmsg_len < min_len)
2030                 return -EINVAL;
2031
2032         if (nlh->nlmsg_len > min_len) {
2033                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
2034                 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
2035
2036                 while (RTA_OK(attr, attrlen)) {
2037                         unsigned flavor = attr->rta_type;
2038                         if (flavor) {
2039                                 if (flavor > rta_max[sz_idx])
2040                                         return -EINVAL;
2041                                 rta_buf[flavor-1] = attr;
2042                         }
2043                         attr = RTA_NEXT(attr, attrlen);
2044                 }
2045         }
2046
2047         doit = rtnl_get_doit(family, type);
2048         if (doit == NULL)
2049                 return -EOPNOTSUPP;
2050
2051         return doit(skb, nlh, (void *)&rta_buf[0]);
2052 }
2053
2054 static void rtnetlink_rcv(struct sk_buff *skb)
2055 {
2056         rtnl_lock();
2057         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2058         rtnl_unlock();
2059 }
2060
2061 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2062 {
2063         struct net_device *dev = ptr;
2064
2065         switch (event) {
2066         case NETDEV_UP:
2067         case NETDEV_DOWN:
2068         case NETDEV_PRE_UP:
2069         case NETDEV_POST_INIT:
2070         case NETDEV_REGISTER:
2071         case NETDEV_CHANGE:
2072         case NETDEV_PRE_TYPE_CHANGE:
2073         case NETDEV_GOING_DOWN:
2074         case NETDEV_UNREGISTER:
2075         case NETDEV_UNREGISTER_BATCH:
2076         case NETDEV_RELEASE:
2077         case NETDEV_JOIN:
2078                 break;
2079         default:
2080                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2081                 break;
2082         }
2083         return NOTIFY_DONE;
2084 }
2085
2086 static struct notifier_block rtnetlink_dev_notifier = {
2087         .notifier_call  = rtnetlink_event,
2088 };
2089
2090
2091 static int __net_init rtnetlink_net_init(struct net *net)
2092 {
2093         struct sock *sk;
2094         sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2095                                    rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2096         if (!sk)
2097                 return -ENOMEM;
2098         net->rtnl = sk;
2099         return 0;
2100 }
2101
2102 static void __net_exit rtnetlink_net_exit(struct net *net)
2103 {
2104         netlink_kernel_release(net->rtnl);
2105         net->rtnl = NULL;
2106 }
2107
2108 static struct pernet_operations rtnetlink_net_ops = {
2109         .init = rtnetlink_net_init,
2110         .exit = rtnetlink_net_exit,
2111 };
2112
2113 void __init rtnetlink_init(void)
2114 {
2115         int i;
2116
2117         rtattr_max = 0;
2118         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2119                 if (rta_max[i] > rtattr_max)
2120                         rtattr_max = rta_max[i];
2121         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2122         if (!rta_buf)
2123                 panic("rtnetlink_init: cannot allocate rta_buf\n");
2124
2125         if (register_pernet_subsys(&rtnetlink_net_ops))
2126                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2127
2128         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2129         register_netdevice_notifier(&rtnetlink_dev_notifier);
2130
2131         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2132                       rtnl_dump_ifinfo, rtnl_calcit);
2133         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2134         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2135         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2136
2137         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2138         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2139 }
2140