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TOMOYO Linux Cross Reference
Linux/net/core/rtnetlink.c

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  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/if_bridge.h>
 39 #include <linux/pci.h>
 40 #include <linux/etherdevice.h>
 41 
 42 #include <asm/uaccess.h>
 43 
 44 #include <linux/inet.h>
 45 #include <linux/netdevice.h>
 46 #include <net/ip.h>
 47 #include <net/protocol.h>
 48 #include <net/arp.h>
 49 #include <net/route.h>
 50 #include <net/udp.h>
 51 #include <net/sock.h>
 52 #include <net/pkt_sched.h>
 53 #include <net/fib_rules.h>
 54 #include <net/rtnetlink.h>
 55 #include <net/net_namespace.h>
 56 
 57 struct rtnl_link {
 58         rtnl_doit_func          doit;
 59         rtnl_dumpit_func        dumpit;
 60         rtnl_calcit_func        calcit;
 61 };
 62 
 63 static DEFINE_MUTEX(rtnl_mutex);
 64 
 65 void rtnl_lock(void)
 66 {
 67         mutex_lock(&rtnl_mutex);
 68 }
 69 EXPORT_SYMBOL(rtnl_lock);
 70 
 71 void __rtnl_unlock(void)
 72 {
 73         mutex_unlock(&rtnl_mutex);
 74 }
 75 
 76 void rtnl_unlock(void)
 77 {
 78         /* This fellow will unlock it for us. */
 79         netdev_run_todo();
 80 }
 81 EXPORT_SYMBOL(rtnl_unlock);
 82 
 83 int rtnl_trylock(void)
 84 {
 85         return mutex_trylock(&rtnl_mutex);
 86 }
 87 EXPORT_SYMBOL(rtnl_trylock);
 88 
 89 int rtnl_is_locked(void)
 90 {
 91         return mutex_is_locked(&rtnl_mutex);
 92 }
 93 EXPORT_SYMBOL(rtnl_is_locked);
 94 
 95 #ifdef CONFIG_PROVE_LOCKING
 96 int lockdep_rtnl_is_held(void)
 97 {
 98         return lockdep_is_held(&rtnl_mutex);
 99 }
100 EXPORT_SYMBOL(lockdep_rtnl_is_held);
101 #endif /* #ifdef CONFIG_PROVE_LOCKING */
102 
103 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
104 
105 static inline int rtm_msgindex(int msgtype)
106 {
107         int msgindex = msgtype - RTM_BASE;
108 
109         /*
110          * msgindex < 0 implies someone tried to register a netlink
111          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
112          * the message type has not been added to linux/rtnetlink.h
113          */
114         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
115 
116         return msgindex;
117 }
118 
119 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
120 {
121         struct rtnl_link *tab;
122 
123         if (protocol <= RTNL_FAMILY_MAX)
124                 tab = rtnl_msg_handlers[protocol];
125         else
126                 tab = NULL;
127 
128         if (tab == NULL || tab[msgindex].doit == NULL)
129                 tab = rtnl_msg_handlers[PF_UNSPEC];
130 
131         return tab[msgindex].doit;
132 }
133 
134 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
135 {
136         struct rtnl_link *tab;
137 
138         if (protocol <= RTNL_FAMILY_MAX)
139                 tab = rtnl_msg_handlers[protocol];
140         else
141                 tab = NULL;
142 
143         if (tab == NULL || tab[msgindex].dumpit == NULL)
144                 tab = rtnl_msg_handlers[PF_UNSPEC];
145 
146         return tab[msgindex].dumpit;
147 }
148 
149 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
150 {
151         struct rtnl_link *tab;
152 
153         if (protocol <= RTNL_FAMILY_MAX)
154                 tab = rtnl_msg_handlers[protocol];
155         else
156                 tab = NULL;
157 
158         if (tab == NULL || tab[msgindex].calcit == NULL)
159                 tab = rtnl_msg_handlers[PF_UNSPEC];
160 
161         return tab[msgindex].calcit;
162 }
163 
164 /**
165  * __rtnl_register - Register a rtnetlink message type
166  * @protocol: Protocol family or PF_UNSPEC
167  * @msgtype: rtnetlink message type
168  * @doit: Function pointer called for each request message
169  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
170  * @calcit: Function pointer to calc size of dump message
171  *
172  * Registers the specified function pointers (at least one of them has
173  * to be non-NULL) to be called whenever a request message for the
174  * specified protocol family and message type is received.
175  *
176  * The special protocol family PF_UNSPEC may be used to define fallback
177  * function pointers for the case when no entry for the specific protocol
178  * family exists.
179  *
180  * Returns 0 on success or a negative error code.
181  */
182 int __rtnl_register(int protocol, int msgtype,
183                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
184                     rtnl_calcit_func calcit)
185 {
186         struct rtnl_link *tab;
187         int msgindex;
188 
189         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
190         msgindex = rtm_msgindex(msgtype);
191 
192         tab = rtnl_msg_handlers[protocol];
193         if (tab == NULL) {
194                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
195                 if (tab == NULL)
196                         return -ENOBUFS;
197 
198                 rtnl_msg_handlers[protocol] = tab;
199         }
200 
201         if (doit)
202                 tab[msgindex].doit = doit;
203 
204         if (dumpit)
205                 tab[msgindex].dumpit = dumpit;
206 
207         if (calcit)
208                 tab[msgindex].calcit = calcit;
209 
210         return 0;
211 }
212 EXPORT_SYMBOL_GPL(__rtnl_register);
213 
214 /**
215  * rtnl_register - Register a rtnetlink message type
216  *
217  * Identical to __rtnl_register() but panics on failure. This is useful
218  * as failure of this function is very unlikely, it can only happen due
219  * to lack of memory when allocating the chain to store all message
220  * handlers for a protocol. Meant for use in init functions where lack
221  * of memory implies no sense in continuing.
222  */
223 void rtnl_register(int protocol, int msgtype,
224                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
225                    rtnl_calcit_func calcit)
226 {
227         if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
228                 panic("Unable to register rtnetlink message handler, "
229                       "protocol = %d, message type = %d\n",
230                       protocol, msgtype);
231 }
232 EXPORT_SYMBOL_GPL(rtnl_register);
233 
234 /**
235  * rtnl_unregister - Unregister a rtnetlink message type
236  * @protocol: Protocol family or PF_UNSPEC
237  * @msgtype: rtnetlink message type
238  *
239  * Returns 0 on success or a negative error code.
240  */
241 int rtnl_unregister(int protocol, int msgtype)
242 {
243         int msgindex;
244 
245         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
246         msgindex = rtm_msgindex(msgtype);
247 
248         if (rtnl_msg_handlers[protocol] == NULL)
249                 return -ENOENT;
250 
251         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
252         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
253 
254         return 0;
255 }
256 EXPORT_SYMBOL_GPL(rtnl_unregister);
257 
258 /**
259  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
260  * @protocol : Protocol family or PF_UNSPEC
261  *
262  * Identical to calling rtnl_unregster() for all registered message types
263  * of a certain protocol family.
264  */
265 void rtnl_unregister_all(int protocol)
266 {
267         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
268 
269         kfree(rtnl_msg_handlers[protocol]);
270         rtnl_msg_handlers[protocol] = NULL;
271 }
272 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
273 
274 static LIST_HEAD(link_ops);
275 
276 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
277 {
278         const struct rtnl_link_ops *ops;
279 
280         list_for_each_entry(ops, &link_ops, list) {
281                 if (!strcmp(ops->kind, kind))
282                         return ops;
283         }
284         return NULL;
285 }
286 
287 /**
288  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
289  * @ops: struct rtnl_link_ops * to register
290  *
291  * The caller must hold the rtnl_mutex. This function should be used
292  * by drivers that create devices during module initialization. It
293  * must be called before registering the devices.
294  *
295  * Returns 0 on success or a negative error code.
296  */
297 int __rtnl_link_register(struct rtnl_link_ops *ops)
298 {
299         if (rtnl_link_ops_get(ops->kind))
300                 return -EEXIST;
301 
302         if (!ops->dellink)
303                 ops->dellink = unregister_netdevice_queue;
304 
305         list_add_tail(&ops->list, &link_ops);
306         return 0;
307 }
308 EXPORT_SYMBOL_GPL(__rtnl_link_register);
309 
310 /**
311  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
312  * @ops: struct rtnl_link_ops * to register
313  *
314  * Returns 0 on success or a negative error code.
315  */
316 int rtnl_link_register(struct rtnl_link_ops *ops)
317 {
318         int err;
319 
320         rtnl_lock();
321         err = __rtnl_link_register(ops);
322         rtnl_unlock();
323         return err;
324 }
325 EXPORT_SYMBOL_GPL(rtnl_link_register);
326 
327 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
328 {
329         struct net_device *dev;
330         LIST_HEAD(list_kill);
331 
332         for_each_netdev(net, dev) {
333                 if (dev->rtnl_link_ops == ops)
334                         ops->dellink(dev, &list_kill);
335         }
336         unregister_netdevice_many(&list_kill);
337 }
338 
339 /**
340  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
341  * @ops: struct rtnl_link_ops * to unregister
342  *
343  * The caller must hold the rtnl_mutex.
344  */
345 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
346 {
347         struct net *net;
348 
349         for_each_net(net) {
350                 __rtnl_kill_links(net, ops);
351         }
352         list_del(&ops->list);
353 }
354 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
355 
356 /**
357  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
358  * @ops: struct rtnl_link_ops * to unregister
359  */
360 void rtnl_link_unregister(struct rtnl_link_ops *ops)
361 {
362         rtnl_lock();
363         __rtnl_link_unregister(ops);
364         rtnl_unlock();
365 }
366 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
367 
368 static size_t rtnl_link_get_size(const struct net_device *dev)
369 {
370         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
371         size_t size;
372 
373         if (!ops)
374                 return 0;
375 
376         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
377                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
378 
379         if (ops->get_size)
380                 /* IFLA_INFO_DATA + nested data */
381                 size += nla_total_size(sizeof(struct nlattr)) +
382                         ops->get_size(dev);
383 
384         if (ops->get_xstats_size)
385                 /* IFLA_INFO_XSTATS */
386                 size += nla_total_size(ops->get_xstats_size(dev));
387 
388         return size;
389 }
390 
391 static LIST_HEAD(rtnl_af_ops);
392 
393 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
394 {
395         const struct rtnl_af_ops *ops;
396 
397         list_for_each_entry(ops, &rtnl_af_ops, list) {
398                 if (ops->family == family)
399                         return ops;
400         }
401 
402         return NULL;
403 }
404 
405 /**
406  * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
407  * @ops: struct rtnl_af_ops * to register
408  *
409  * The caller must hold the rtnl_mutex.
410  *
411  * Returns 0 on success or a negative error code.
412  */
413 int __rtnl_af_register(struct rtnl_af_ops *ops)
414 {
415         list_add_tail(&ops->list, &rtnl_af_ops);
416         return 0;
417 }
418 EXPORT_SYMBOL_GPL(__rtnl_af_register);
419 
420 /**
421  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
422  * @ops: struct rtnl_af_ops * to register
423  *
424  * Returns 0 on success or a negative error code.
425  */
426 int rtnl_af_register(struct rtnl_af_ops *ops)
427 {
428         int err;
429 
430         rtnl_lock();
431         err = __rtnl_af_register(ops);
432         rtnl_unlock();
433         return err;
434 }
435 EXPORT_SYMBOL_GPL(rtnl_af_register);
436 
437 /**
438  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
439  * @ops: struct rtnl_af_ops * to unregister
440  *
441  * The caller must hold the rtnl_mutex.
442  */
443 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
444 {
445         list_del(&ops->list);
446 }
447 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
448 
449 /**
450  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
451  * @ops: struct rtnl_af_ops * to unregister
452  */
453 void rtnl_af_unregister(struct rtnl_af_ops *ops)
454 {
455         rtnl_lock();
456         __rtnl_af_unregister(ops);
457         rtnl_unlock();
458 }
459 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
460 
461 static size_t rtnl_link_get_af_size(const struct net_device *dev)
462 {
463         struct rtnl_af_ops *af_ops;
464         size_t size;
465 
466         /* IFLA_AF_SPEC */
467         size = nla_total_size(sizeof(struct nlattr));
468 
469         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
470                 if (af_ops->get_link_af_size) {
471                         /* AF_* + nested data */
472                         size += nla_total_size(sizeof(struct nlattr)) +
473                                 af_ops->get_link_af_size(dev);
474                 }
475         }
476 
477         return size;
478 }
479 
480 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
481 {
482         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
483         struct nlattr *linkinfo, *data;
484         int err = -EMSGSIZE;
485 
486         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
487         if (linkinfo == NULL)
488                 goto out;
489 
490         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
491                 goto err_cancel_link;
492         if (ops->fill_xstats) {
493                 err = ops->fill_xstats(skb, dev);
494                 if (err < 0)
495                         goto err_cancel_link;
496         }
497         if (ops->fill_info) {
498                 data = nla_nest_start(skb, IFLA_INFO_DATA);
499                 if (data == NULL) {
500                         err = -EMSGSIZE;
501                         goto err_cancel_link;
502                 }
503                 err = ops->fill_info(skb, dev);
504                 if (err < 0)
505                         goto err_cancel_data;
506                 nla_nest_end(skb, data);
507         }
508 
509         nla_nest_end(skb, linkinfo);
510         return 0;
511 
512 err_cancel_data:
513         nla_nest_cancel(skb, data);
514 err_cancel_link:
515         nla_nest_cancel(skb, linkinfo);
516 out:
517         return err;
518 }
519 
520 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
521 {
522         struct sock *rtnl = net->rtnl;
523         int err = 0;
524 
525         NETLINK_CB(skb).dst_group = group;
526         if (echo)
527                 atomic_inc(&skb->users);
528         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
529         if (echo)
530                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
531         return err;
532 }
533 
534 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
535 {
536         struct sock *rtnl = net->rtnl;
537 
538         return nlmsg_unicast(rtnl, skb, pid);
539 }
540 EXPORT_SYMBOL(rtnl_unicast);
541 
542 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
543                  struct nlmsghdr *nlh, gfp_t flags)
544 {
545         struct sock *rtnl = net->rtnl;
546         int report = 0;
547 
548         if (nlh)
549                 report = nlmsg_report(nlh);
550 
551         nlmsg_notify(rtnl, skb, pid, group, report, flags);
552 }
553 EXPORT_SYMBOL(rtnl_notify);
554 
555 void rtnl_set_sk_err(struct net *net, u32 group, int error)
556 {
557         struct sock *rtnl = net->rtnl;
558 
559         netlink_set_err(rtnl, 0, group, error);
560 }
561 EXPORT_SYMBOL(rtnl_set_sk_err);
562 
563 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
564 {
565         struct nlattr *mx;
566         int i, valid = 0;
567 
568         mx = nla_nest_start(skb, RTA_METRICS);
569         if (mx == NULL)
570                 return -ENOBUFS;
571 
572         for (i = 0; i < RTAX_MAX; i++) {
573                 if (metrics[i]) {
574                         valid++;
575                         if (nla_put_u32(skb, i+1, metrics[i]))
576                                 goto nla_put_failure;
577                 }
578         }
579 
580         if (!valid) {
581                 nla_nest_cancel(skb, mx);
582                 return 0;
583         }
584 
585         return nla_nest_end(skb, mx);
586 
587 nla_put_failure:
588         nla_nest_cancel(skb, mx);
589         return -EMSGSIZE;
590 }
591 EXPORT_SYMBOL(rtnetlink_put_metrics);
592 
593 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
594                        long expires, u32 error)
595 {
596         struct rta_cacheinfo ci = {
597                 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
598                 .rta_used = dst->__use,
599                 .rta_clntref = atomic_read(&(dst->__refcnt)),
600                 .rta_error = error,
601                 .rta_id =  id,
602         };
603 
604         if (expires) {
605                 unsigned long clock;
606 
607                 clock = jiffies_to_clock_t(abs(expires));
608                 clock = min_t(unsigned long, clock, INT_MAX);
609                 ci.rta_expires = (expires > 0) ? clock : -clock;
610         }
611         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
612 }
613 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
614 
615 static void set_operstate(struct net_device *dev, unsigned char transition)
616 {
617         unsigned char operstate = dev->operstate;
618 
619         switch (transition) {
620         case IF_OPER_UP:
621                 if ((operstate == IF_OPER_DORMANT ||
622                      operstate == IF_OPER_UNKNOWN) &&
623                     !netif_dormant(dev))
624                         operstate = IF_OPER_UP;
625                 break;
626 
627         case IF_OPER_DORMANT:
628                 if (operstate == IF_OPER_UP ||
629                     operstate == IF_OPER_UNKNOWN)
630                         operstate = IF_OPER_DORMANT;
631                 break;
632         }
633 
634         if (dev->operstate != operstate) {
635                 write_lock_bh(&dev_base_lock);
636                 dev->operstate = operstate;
637                 write_unlock_bh(&dev_base_lock);
638                 netdev_state_change(dev);
639         }
640 }
641 
642 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
643 {
644         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
645                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
646 }
647 
648 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
649                                            const struct ifinfomsg *ifm)
650 {
651         unsigned int flags = ifm->ifi_flags;
652 
653         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
654         if (ifm->ifi_change)
655                 flags = (flags & ifm->ifi_change) |
656                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
657 
658         return flags;
659 }
660 
661 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
662                                  const struct rtnl_link_stats64 *b)
663 {
664         a->rx_packets = b->rx_packets;
665         a->tx_packets = b->tx_packets;
666         a->rx_bytes = b->rx_bytes;
667         a->tx_bytes = b->tx_bytes;
668         a->rx_errors = b->rx_errors;
669         a->tx_errors = b->tx_errors;
670         a->rx_dropped = b->rx_dropped;
671         a->tx_dropped = b->tx_dropped;
672 
673         a->multicast = b->multicast;
674         a->collisions = b->collisions;
675 
676         a->rx_length_errors = b->rx_length_errors;
677         a->rx_over_errors = b->rx_over_errors;
678         a->rx_crc_errors = b->rx_crc_errors;
679         a->rx_frame_errors = b->rx_frame_errors;
680         a->rx_fifo_errors = b->rx_fifo_errors;
681         a->rx_missed_errors = b->rx_missed_errors;
682 
683         a->tx_aborted_errors = b->tx_aborted_errors;
684         a->tx_carrier_errors = b->tx_carrier_errors;
685         a->tx_fifo_errors = b->tx_fifo_errors;
686         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
687         a->tx_window_errors = b->tx_window_errors;
688 
689         a->rx_compressed = b->rx_compressed;
690         a->tx_compressed = b->tx_compressed;
691 }
692 
693 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
694 {
695         memcpy(v, b, sizeof(*b));
696 }
697 
698 /* All VF info */
699 static inline int rtnl_vfinfo_size(const struct net_device *dev,
700                                    u32 ext_filter_mask)
701 {
702         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
703             (ext_filter_mask & RTEXT_FILTER_VF)) {
704                 int num_vfs = dev_num_vf(dev->dev.parent);
705                 size_t size = nla_total_size(sizeof(struct nlattr));
706                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
707                 size += num_vfs *
708                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
709                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
710                          nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
711                          nla_total_size(sizeof(struct ifla_vf_spoofchk)));
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                                      u32 ext_filter_mask)
744 {
745         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
746                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
747                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
748                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
749                + nla_total_size(sizeof(struct rtnl_link_ifmap))
750                + nla_total_size(sizeof(struct rtnl_link_stats))
751                + nla_total_size(sizeof(struct rtnl_link_stats64))
752                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
753                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
754                + nla_total_size(4) /* IFLA_TXQLEN */
755                + nla_total_size(4) /* IFLA_WEIGHT */
756                + nla_total_size(4) /* IFLA_MTU */
757                + nla_total_size(4) /* IFLA_LINK */
758                + nla_total_size(4) /* IFLA_MASTER */
759                + nla_total_size(1) /* IFLA_CARRIER */
760                + nla_total_size(4) /* IFLA_PROMISCUITY */
761                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
762                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
763                + nla_total_size(1) /* IFLA_OPERSTATE */
764                + nla_total_size(1) /* IFLA_LINKMODE */
765                + nla_total_size(ext_filter_mask
766                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
767                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
768                + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
769                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
770                + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
771                + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */
772 }
773 
774 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
775 {
776         struct nlattr *vf_ports;
777         struct nlattr *vf_port;
778         int vf;
779         int err;
780 
781         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
782         if (!vf_ports)
783                 return -EMSGSIZE;
784 
785         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
786                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
787                 if (!vf_port)
788                         goto nla_put_failure;
789                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
790                         goto nla_put_failure;
791                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
792                 if (err == -EMSGSIZE)
793                         goto nla_put_failure;
794                 if (err) {
795                         nla_nest_cancel(skb, vf_port);
796                         continue;
797                 }
798                 nla_nest_end(skb, vf_port);
799         }
800 
801         nla_nest_end(skb, vf_ports);
802 
803         return 0;
804 
805 nla_put_failure:
806         nla_nest_cancel(skb, vf_ports);
807         return -EMSGSIZE;
808 }
809 
810 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
811 {
812         struct nlattr *port_self;
813         int err;
814 
815         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
816         if (!port_self)
817                 return -EMSGSIZE;
818 
819         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
820         if (err) {
821                 nla_nest_cancel(skb, port_self);
822                 return (err == -EMSGSIZE) ? err : 0;
823         }
824 
825         nla_nest_end(skb, port_self);
826 
827         return 0;
828 }
829 
830 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
831 {
832         int err;
833 
834         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
835                 return 0;
836 
837         err = rtnl_port_self_fill(skb, dev);
838         if (err)
839                 return err;
840 
841         if (dev_num_vf(dev->dev.parent)) {
842                 err = rtnl_vf_ports_fill(skb, dev);
843                 if (err)
844                         return err;
845         }
846 
847         return 0;
848 }
849 
850 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
851 {
852         int err;
853         struct netdev_phys_port_id ppid;
854 
855         err = dev_get_phys_port_id(dev, &ppid);
856         if (err) {
857                 if (err == -EOPNOTSUPP)
858                         return 0;
859                 return err;
860         }
861 
862         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
863                 return -EMSGSIZE;
864 
865         return 0;
866 }
867 
868 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
869                             int type, u32 pid, u32 seq, u32 change,
870                             unsigned int flags, u32 ext_filter_mask)
871 {
872         struct ifinfomsg *ifm;
873         struct nlmsghdr *nlh;
874         struct rtnl_link_stats64 temp;
875         const struct rtnl_link_stats64 *stats;
876         struct nlattr *attr, *af_spec;
877         struct rtnl_af_ops *af_ops;
878         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
879 
880         ASSERT_RTNL();
881         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
882         if (nlh == NULL)
883                 return -EMSGSIZE;
884 
885         ifm = nlmsg_data(nlh);
886         ifm->ifi_family = AF_UNSPEC;
887         ifm->__ifi_pad = 0;
888         ifm->ifi_type = dev->type;
889         ifm->ifi_index = dev->ifindex;
890         ifm->ifi_flags = dev_get_flags(dev);
891         ifm->ifi_change = change;
892 
893         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
894             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
895             nla_put_u8(skb, IFLA_OPERSTATE,
896                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
897             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
898             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
899             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
900             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
901             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
902 #ifdef CONFIG_RPS
903             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
904 #endif
905             (dev->ifindex != dev->iflink &&
906              nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
907             (upper_dev &&
908              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
909             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
910             (dev->qdisc &&
911              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
912             (dev->ifalias &&
913              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)))
914                 goto nla_put_failure;
915 
916         if (1) {
917                 struct rtnl_link_ifmap map = {
918                         .mem_start   = dev->mem_start,
919                         .mem_end     = dev->mem_end,
920                         .base_addr   = dev->base_addr,
921                         .irq         = dev->irq,
922                         .dma         = dev->dma,
923                         .port        = dev->if_port,
924                 };
925                 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
926                         goto nla_put_failure;
927         }
928 
929         if (dev->addr_len) {
930                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
931                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
932                         goto nla_put_failure;
933         }
934 
935         if (rtnl_phys_port_id_fill(skb, dev))
936                 goto nla_put_failure;
937 
938         attr = nla_reserve(skb, IFLA_STATS,
939                         sizeof(struct rtnl_link_stats));
940         if (attr == NULL)
941                 goto nla_put_failure;
942 
943         stats = dev_get_stats(dev, &temp);
944         copy_rtnl_link_stats(nla_data(attr), stats);
945 
946         attr = nla_reserve(skb, IFLA_STATS64,
947                         sizeof(struct rtnl_link_stats64));
948         if (attr == NULL)
949                 goto nla_put_failure;
950         copy_rtnl_link_stats64(nla_data(attr), stats);
951 
952         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
953             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
954                 goto nla_put_failure;
955 
956         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
957             && (ext_filter_mask & RTEXT_FILTER_VF)) {
958                 int i;
959 
960                 struct nlattr *vfinfo, *vf;
961                 int num_vfs = dev_num_vf(dev->dev.parent);
962 
963                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
964                 if (!vfinfo)
965                         goto nla_put_failure;
966                 for (i = 0; i < num_vfs; i++) {
967                         struct ifla_vf_info ivi;
968                         struct ifla_vf_mac vf_mac;
969                         struct ifla_vf_vlan vf_vlan;
970                         struct ifla_vf_tx_rate vf_tx_rate;
971                         struct ifla_vf_spoofchk vf_spoofchk;
972                         struct ifla_vf_link_state vf_linkstate;
973 
974                         /*
975                          * Not all SR-IOV capable drivers support the
976                          * spoofcheck query.  Preset to -1 so the user
977                          * space tool can detect that the driver didn't
978                          * report anything.
979                          */
980                         ivi.spoofchk = -1;
981                         memset(ivi.mac, 0, sizeof(ivi.mac));
982                         /* The default value for VF link state is "auto"
983                          * IFLA_VF_LINK_STATE_AUTO which equals zero
984                          */
985                         ivi.linkstate = 0;
986                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
987                                 break;
988                         vf_mac.vf =
989                                 vf_vlan.vf =
990                                 vf_tx_rate.vf =
991                                 vf_spoofchk.vf =
992                                 vf_linkstate.vf = ivi.vf;
993 
994                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
995                         vf_vlan.vlan = ivi.vlan;
996                         vf_vlan.qos = ivi.qos;
997                         vf_tx_rate.rate = ivi.tx_rate;
998                         vf_spoofchk.setting = ivi.spoofchk;
999                         vf_linkstate.link_state = ivi.linkstate;
1000                         vf = nla_nest_start(skb, IFLA_VF_INFO);
1001                         if (!vf) {
1002                                 nla_nest_cancel(skb, vfinfo);
1003                                 goto nla_put_failure;
1004                         }
1005                         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1006                             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1007                             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1008                                     &vf_tx_rate) ||
1009                             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1010                                     &vf_spoofchk) ||
1011                             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1012                                     &vf_linkstate))
1013                                 goto nla_put_failure;
1014                         nla_nest_end(skb, vf);
1015                 }
1016                 nla_nest_end(skb, vfinfo);
1017         }
1018 
1019         if (rtnl_port_fill(skb, dev))
1020                 goto nla_put_failure;
1021 
1022         if (dev->rtnl_link_ops) {
1023                 if (rtnl_link_fill(skb, dev) < 0)
1024                         goto nla_put_failure;
1025         }
1026 
1027         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1028                 goto nla_put_failure;
1029 
1030         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1031                 if (af_ops->fill_link_af) {
1032                         struct nlattr *af;
1033                         int err;
1034 
1035                         if (!(af = nla_nest_start(skb, af_ops->family)))
1036                                 goto nla_put_failure;
1037 
1038                         err = af_ops->fill_link_af(skb, dev);
1039 
1040                         /*
1041                          * Caller may return ENODATA to indicate that there
1042                          * was no data to be dumped. This is not an error, it
1043                          * means we should trim the attribute header and
1044                          * continue.
1045                          */
1046                         if (err == -ENODATA)
1047                                 nla_nest_cancel(skb, af);
1048                         else if (err < 0)
1049                                 goto nla_put_failure;
1050 
1051                         nla_nest_end(skb, af);
1052                 }
1053         }
1054 
1055         nla_nest_end(skb, af_spec);
1056 
1057         return nlmsg_end(skb, nlh);
1058 
1059 nla_put_failure:
1060         nlmsg_cancel(skb, nlh);
1061         return -EMSGSIZE;
1062 }
1063 
1064 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1065 {
1066         struct net *net = sock_net(skb->sk);
1067         int h, s_h;
1068         int idx = 0, s_idx;
1069         struct net_device *dev;
1070         struct hlist_head *head;
1071         struct nlattr *tb[IFLA_MAX+1];
1072         u32 ext_filter_mask = 0;
1073 
1074         s_h = cb->args[0];
1075         s_idx = cb->args[1];
1076 
1077         rcu_read_lock();
1078         cb->seq = net->dev_base_seq;
1079 
1080         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1081                         ifla_policy) >= 0) {
1082 
1083                 if (tb[IFLA_EXT_MASK])
1084                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1085         }
1086 
1087         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1088                 idx = 0;
1089                 head = &net->dev_index_head[h];
1090                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1091                         if (idx < s_idx)
1092                                 goto cont;
1093                         if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1094                                              NETLINK_CB(cb->skb).portid,
1095                                              cb->nlh->nlmsg_seq, 0,
1096                                              NLM_F_MULTI,
1097                                              ext_filter_mask) <= 0)
1098                                 goto out;
1099 
1100                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1101 cont:
1102                         idx++;
1103                 }
1104         }
1105 out:
1106         rcu_read_unlock();
1107         cb->args[1] = idx;
1108         cb->args[0] = h;
1109 
1110         return skb->len;
1111 }
1112 
1113 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1114         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1115         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1116         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1117         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1118         [IFLA_MTU]              = { .type = NLA_U32 },
1119         [IFLA_LINK]             = { .type = NLA_U32 },
1120         [IFLA_MASTER]           = { .type = NLA_U32 },
1121         [IFLA_CARRIER]          = { .type = NLA_U8 },
1122         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1123         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1124         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1125         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1126         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1127         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1128         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1129         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1130         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1131         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1132         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1133         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1134         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1135         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1136         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1137         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1138         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
1139 };
1140 EXPORT_SYMBOL(ifla_policy);
1141 
1142 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1143         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1144         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1145 };
1146 
1147 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1148         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1149 };
1150 
1151 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1152         [IFLA_VF_MAC]           = { .type = NLA_BINARY,
1153                                     .len = sizeof(struct ifla_vf_mac) },
1154         [IFLA_VF_VLAN]          = { .type = NLA_BINARY,
1155                                     .len = sizeof(struct ifla_vf_vlan) },
1156         [IFLA_VF_TX_RATE]       = { .type = NLA_BINARY,
1157                                     .len = sizeof(struct ifla_vf_tx_rate) },
1158         [IFLA_VF_SPOOFCHK]      = { .type = NLA_BINARY,
1159                                     .len = sizeof(struct ifla_vf_spoofchk) },
1160 };
1161 
1162 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1163         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1164         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1165                                     .len = PORT_PROFILE_MAX },
1166         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1167                                     .len = sizeof(struct ifla_port_vsi)},
1168         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1169                                       .len = PORT_UUID_MAX },
1170         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1171                                     .len = PORT_UUID_MAX },
1172         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1173         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1174 };
1175 
1176 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1177 {
1178         struct net *net;
1179         /* Examine the link attributes and figure out which
1180          * network namespace we are talking about.
1181          */
1182         if (tb[IFLA_NET_NS_PID])
1183                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1184         else if (tb[IFLA_NET_NS_FD])
1185                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1186         else
1187                 net = get_net(src_net);
1188         return net;
1189 }
1190 EXPORT_SYMBOL(rtnl_link_get_net);
1191 
1192 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1193 {
1194         if (dev) {
1195                 if (tb[IFLA_ADDRESS] &&
1196                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1197                         return -EINVAL;
1198 
1199                 if (tb[IFLA_BROADCAST] &&
1200                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1201                         return -EINVAL;
1202         }
1203 
1204         if (tb[IFLA_AF_SPEC]) {
1205                 struct nlattr *af;
1206                 int rem, err;
1207 
1208                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1209                         const struct rtnl_af_ops *af_ops;
1210 
1211                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1212                                 return -EAFNOSUPPORT;
1213 
1214                         if (!af_ops->set_link_af)
1215                                 return -EOPNOTSUPP;
1216 
1217                         if (af_ops->validate_link_af) {
1218                                 err = af_ops->validate_link_af(dev, af);
1219                                 if (err < 0)
1220                                         return err;
1221                         }
1222                 }
1223         }
1224 
1225         return 0;
1226 }
1227 
1228 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1229 {
1230         int rem, err = -EINVAL;
1231         struct nlattr *vf;
1232         const struct net_device_ops *ops = dev->netdev_ops;
1233 
1234         nla_for_each_nested(vf, attr, rem) {
1235                 switch (nla_type(vf)) {
1236                 case IFLA_VF_MAC: {
1237                         struct ifla_vf_mac *ivm;
1238                         ivm = nla_data(vf);
1239                         err = -EOPNOTSUPP;
1240                         if (ops->ndo_set_vf_mac)
1241                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1242                                                           ivm->mac);
1243                         break;
1244                 }
1245                 case IFLA_VF_VLAN: {
1246                         struct ifla_vf_vlan *ivv;
1247                         ivv = nla_data(vf);
1248                         err = -EOPNOTSUPP;
1249                         if (ops->ndo_set_vf_vlan)
1250                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1251                                                            ivv->vlan,
1252                                                            ivv->qos);
1253                         break;
1254                 }
1255                 case IFLA_VF_TX_RATE: {
1256                         struct ifla_vf_tx_rate *ivt;
1257                         ivt = nla_data(vf);
1258                         err = -EOPNOTSUPP;
1259                         if (ops->ndo_set_vf_tx_rate)
1260                                 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1261                                                               ivt->rate);
1262                         break;
1263                 }
1264                 case IFLA_VF_SPOOFCHK: {
1265                         struct ifla_vf_spoofchk *ivs;
1266                         ivs = nla_data(vf);
1267                         err = -EOPNOTSUPP;
1268                         if (ops->ndo_set_vf_spoofchk)
1269                                 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1270                                                                ivs->setting);
1271                         break;
1272                 }
1273                 case IFLA_VF_LINK_STATE: {
1274                         struct ifla_vf_link_state *ivl;
1275                         ivl = nla_data(vf);
1276                         err = -EOPNOTSUPP;
1277                         if (ops->ndo_set_vf_link_state)
1278                                 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1279                                                                  ivl->link_state);
1280                         break;
1281                 }
1282                 default:
1283                         err = -EINVAL;
1284                         break;
1285                 }
1286                 if (err)
1287                         break;
1288         }
1289         return err;
1290 }
1291 
1292 static int do_set_master(struct net_device *dev, int ifindex)
1293 {
1294         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1295         const struct net_device_ops *ops;
1296         int err;
1297 
1298         if (upper_dev) {
1299                 if (upper_dev->ifindex == ifindex)
1300                         return 0;
1301                 ops = upper_dev->netdev_ops;
1302                 if (ops->ndo_del_slave) {
1303                         err = ops->ndo_del_slave(upper_dev, dev);
1304                         if (err)
1305                                 return err;
1306                 } else {
1307                         return -EOPNOTSUPP;
1308                 }
1309         }
1310 
1311         if (ifindex) {
1312                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1313                 if (!upper_dev)
1314                         return -EINVAL;
1315                 ops = upper_dev->netdev_ops;
1316                 if (ops->ndo_add_slave) {
1317                         err = ops->ndo_add_slave(upper_dev, dev);
1318                         if (err)
1319                                 return err;
1320                 } else {
1321                         return -EOPNOTSUPP;
1322                 }
1323         }
1324         return 0;
1325 }
1326 
1327 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1328                       struct nlattr **tb, char *ifname, int modified)
1329 {
1330         const struct net_device_ops *ops = dev->netdev_ops;
1331         int err;
1332 
1333         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1334                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1335                 if (IS_ERR(net)) {
1336                         err = PTR_ERR(net);
1337                         goto errout;
1338                 }
1339                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1340                         err = -EPERM;
1341                         goto errout;
1342                 }
1343                 err = dev_change_net_namespace(dev, net, ifname);
1344                 put_net(net);
1345                 if (err)
1346                         goto errout;
1347                 modified = 1;
1348         }
1349 
1350         if (tb[IFLA_MAP]) {
1351                 struct rtnl_link_ifmap *u_map;
1352                 struct ifmap k_map;
1353 
1354                 if (!ops->ndo_set_config) {
1355                         err = -EOPNOTSUPP;
1356                         goto errout;
1357                 }
1358 
1359                 if (!netif_device_present(dev)) {
1360                         err = -ENODEV;
1361                         goto errout;
1362                 }
1363 
1364                 u_map = nla_data(tb[IFLA_MAP]);
1365                 k_map.mem_start = (unsigned long) u_map->mem_start;
1366                 k_map.mem_end = (unsigned long) u_map->mem_end;
1367                 k_map.base_addr = (unsigned short) u_map->base_addr;
1368                 k_map.irq = (unsigned char) u_map->irq;
1369                 k_map.dma = (unsigned char) u_map->dma;
1370                 k_map.port = (unsigned char) u_map->port;
1371 
1372                 err = ops->ndo_set_config(dev, &k_map);
1373                 if (err < 0)
1374                         goto errout;
1375 
1376                 modified = 1;
1377         }
1378 
1379         if (tb[IFLA_ADDRESS]) {
1380                 struct sockaddr *sa;
1381                 int len;
1382 
1383                 len = sizeof(sa_family_t) + dev->addr_len;
1384                 sa = kmalloc(len, GFP_KERNEL);
1385                 if (!sa) {
1386                         err = -ENOMEM;
1387                         goto errout;
1388                 }
1389                 sa->sa_family = dev->type;
1390                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1391                        dev->addr_len);
1392                 err = dev_set_mac_address(dev, sa);
1393                 kfree(sa);
1394                 if (err)
1395                         goto errout;
1396                 modified = 1;
1397         }
1398 
1399         if (tb[IFLA_MTU]) {
1400                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1401                 if (err < 0)
1402                         goto errout;
1403                 modified = 1;
1404         }
1405 
1406         if (tb[IFLA_GROUP]) {
1407                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1408                 modified = 1;
1409         }
1410 
1411         /*
1412          * Interface selected by interface index but interface
1413          * name provided implies that a name change has been
1414          * requested.
1415          */
1416         if (ifm->ifi_index > 0 && ifname[0]) {
1417                 err = dev_change_name(dev, ifname);
1418                 if (err < 0)
1419                         goto errout;
1420                 modified = 1;
1421         }
1422 
1423         if (tb[IFLA_IFALIAS]) {
1424                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1425                                     nla_len(tb[IFLA_IFALIAS]));
1426                 if (err < 0)
1427                         goto errout;
1428                 modified = 1;
1429         }
1430 
1431         if (tb[IFLA_BROADCAST]) {
1432                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1433                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1434         }
1435 
1436         if (ifm->ifi_flags || ifm->ifi_change) {
1437                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1438                 if (err < 0)
1439                         goto errout;
1440         }
1441 
1442         if (tb[IFLA_MASTER]) {
1443                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1444                 if (err)
1445                         goto errout;
1446                 modified = 1;
1447         }
1448 
1449         if (tb[IFLA_CARRIER]) {
1450                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1451                 if (err)
1452                         goto errout;
1453                 modified = 1;
1454         }
1455 
1456         if (tb[IFLA_TXQLEN])
1457                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1458 
1459         if (tb[IFLA_OPERSTATE])
1460                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1461 
1462         if (tb[IFLA_LINKMODE]) {
1463                 write_lock_bh(&dev_base_lock);
1464                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1465                 write_unlock_bh(&dev_base_lock);
1466         }
1467 
1468         if (tb[IFLA_VFINFO_LIST]) {
1469                 struct nlattr *attr;
1470                 int rem;
1471                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1472                         if (nla_type(attr) != IFLA_VF_INFO) {
1473                                 err = -EINVAL;
1474                                 goto errout;
1475                         }
1476                         err = do_setvfinfo(dev, attr);
1477                         if (err < 0)
1478                                 goto errout;
1479                         modified = 1;
1480                 }
1481         }
1482         err = 0;
1483 
1484         if (tb[IFLA_VF_PORTS]) {
1485                 struct nlattr *port[IFLA_PORT_MAX+1];
1486                 struct nlattr *attr;
1487                 int vf;
1488                 int rem;
1489 
1490                 err = -EOPNOTSUPP;
1491                 if (!ops->ndo_set_vf_port)
1492                         goto errout;
1493 
1494                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1495                         if (nla_type(attr) != IFLA_VF_PORT)
1496                                 continue;
1497                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1498                                 attr, ifla_port_policy);
1499                         if (err < 0)
1500                                 goto errout;
1501                         if (!port[IFLA_PORT_VF]) {
1502                                 err = -EOPNOTSUPP;
1503                                 goto errout;
1504                         }
1505                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1506                         err = ops->ndo_set_vf_port(dev, vf, port);
1507                         if (err < 0)
1508                                 goto errout;
1509                         modified = 1;
1510                 }
1511         }
1512         err = 0;
1513 
1514         if (tb[IFLA_PORT_SELF]) {
1515                 struct nlattr *port[IFLA_PORT_MAX+1];
1516 
1517                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1518                         tb[IFLA_PORT_SELF], ifla_port_policy);
1519                 if (err < 0)
1520                         goto errout;
1521 
1522                 err = -EOPNOTSUPP;
1523                 if (ops->ndo_set_vf_port)
1524                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1525                 if (err < 0)
1526                         goto errout;
1527                 modified = 1;
1528         }
1529 
1530         if (tb[IFLA_AF_SPEC]) {
1531                 struct nlattr *af;
1532                 int rem;
1533 
1534                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1535                         const struct rtnl_af_ops *af_ops;
1536 
1537                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1538                                 BUG();
1539 
1540                         err = af_ops->set_link_af(dev, af);
1541                         if (err < 0)
1542                                 goto errout;
1543 
1544                         modified = 1;
1545                 }
1546         }
1547         err = 0;
1548 
1549 errout:
1550         if (err < 0 && modified)
1551                 net_warn_ratelimited("A link change request failed with some changes committed already. Interface %s may have been left with an inconsistent configuration, please check.\n",
1552                                      dev->name);
1553 
1554         return err;
1555 }
1556 
1557 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1558 {
1559         struct net *net = sock_net(skb->sk);
1560         struct ifinfomsg *ifm;
1561         struct net_device *dev;
1562         int err;
1563         struct nlattr *tb[IFLA_MAX+1];
1564         char ifname[IFNAMSIZ];
1565 
1566         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1567         if (err < 0)
1568                 goto errout;
1569 
1570         if (tb[IFLA_IFNAME])
1571                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1572         else
1573                 ifname[0] = '\0';
1574 
1575         err = -EINVAL;
1576         ifm = nlmsg_data(nlh);
1577         if (ifm->ifi_index > 0)
1578                 dev = __dev_get_by_index(net, ifm->ifi_index);
1579         else if (tb[IFLA_IFNAME])
1580                 dev = __dev_get_by_name(net, ifname);
1581         else
1582                 goto errout;
1583 
1584         if (dev == NULL) {
1585                 err = -ENODEV;
1586                 goto errout;
1587         }
1588 
1589         err = validate_linkmsg(dev, tb);
1590         if (err < 0)
1591                 goto errout;
1592 
1593         err = do_setlink(dev, ifm, tb, ifname, 0);
1594 errout:
1595         return err;
1596 }
1597 
1598 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1599 {
1600         struct net *net = sock_net(skb->sk);
1601         const struct rtnl_link_ops *ops;
1602         struct net_device *dev;
1603         struct ifinfomsg *ifm;
1604         char ifname[IFNAMSIZ];
1605         struct nlattr *tb[IFLA_MAX+1];
1606         int err;
1607         LIST_HEAD(list_kill);
1608 
1609         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1610         if (err < 0)
1611                 return err;
1612 
1613         if (tb[IFLA_IFNAME])
1614                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1615 
1616         ifm = nlmsg_data(nlh);
1617         if (ifm->ifi_index > 0)
1618                 dev = __dev_get_by_index(net, ifm->ifi_index);
1619         else if (tb[IFLA_IFNAME])
1620                 dev = __dev_get_by_name(net, ifname);
1621         else
1622                 return -EINVAL;
1623 
1624         if (!dev)
1625                 return -ENODEV;
1626 
1627         ops = dev->rtnl_link_ops;
1628         if (!ops)
1629                 return -EOPNOTSUPP;
1630 
1631         ops->dellink(dev, &list_kill);
1632         unregister_netdevice_many(&list_kill);
1633         list_del(&list_kill);
1634         return 0;
1635 }
1636 
1637 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1638 {
1639         unsigned int old_flags;
1640         int err;
1641 
1642         old_flags = dev->flags;
1643         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1644                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1645                 if (err < 0)
1646                         return err;
1647         }
1648 
1649         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1650 
1651         __dev_notify_flags(dev, old_flags, ~0U);
1652         return 0;
1653 }
1654 EXPORT_SYMBOL(rtnl_configure_link);
1655 
1656 struct net_device *rtnl_create_link(struct net *net,
1657         char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1658 {
1659         int err;
1660         struct net_device *dev;
1661         unsigned int num_tx_queues = 1;
1662         unsigned int num_rx_queues = 1;
1663 
1664         if (tb[IFLA_NUM_TX_QUEUES])
1665                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1666         else if (ops->get_num_tx_queues)
1667                 num_tx_queues = ops->get_num_tx_queues();
1668 
1669         if (tb[IFLA_NUM_RX_QUEUES])
1670                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1671         else if (ops->get_num_rx_queues)
1672                 num_rx_queues = ops->get_num_rx_queues();
1673 
1674         err = -ENOMEM;
1675         dev = alloc_netdev_mqs(ops->priv_size, ifname, ops->setup,
1676                                num_tx_queues, num_rx_queues);
1677         if (!dev)
1678                 goto err;
1679 
1680         dev_net_set(dev, net);
1681         dev->rtnl_link_ops = ops;
1682         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1683 
1684         if (tb[IFLA_MTU])
1685                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1686         if (tb[IFLA_ADDRESS]) {
1687                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1688                                 nla_len(tb[IFLA_ADDRESS]));
1689                 dev->addr_assign_type = NET_ADDR_SET;
1690         }
1691         if (tb[IFLA_BROADCAST])
1692                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1693                                 nla_len(tb[IFLA_BROADCAST]));
1694         if (tb[IFLA_TXQLEN])
1695                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1696         if (tb[IFLA_OPERSTATE])
1697                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1698         if (tb[IFLA_LINKMODE])
1699                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1700         if (tb[IFLA_GROUP])
1701                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1702 
1703         return dev;
1704 
1705 err:
1706         return ERR_PTR(err);
1707 }
1708 EXPORT_SYMBOL(rtnl_create_link);
1709 
1710 static int rtnl_group_changelink(struct net *net, int group,
1711                 struct ifinfomsg *ifm,
1712                 struct nlattr **tb)
1713 {
1714         struct net_device *dev;
1715         int err;
1716 
1717         for_each_netdev(net, dev) {
1718                 if (dev->group == group) {
1719                         err = do_setlink(dev, ifm, tb, NULL, 0);
1720                         if (err < 0)
1721                                 return err;
1722                 }
1723         }
1724 
1725         return 0;
1726 }
1727 
1728 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1729 {
1730         struct net *net = sock_net(skb->sk);
1731         const struct rtnl_link_ops *ops;
1732         struct net_device *dev;
1733         struct ifinfomsg *ifm;
1734         char kind[MODULE_NAME_LEN];
1735         char ifname[IFNAMSIZ];
1736         struct nlattr *tb[IFLA_MAX+1];
1737         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1738         int err;
1739 
1740 #ifdef CONFIG_MODULES
1741 replay:
1742 #endif
1743         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1744         if (err < 0)
1745                 return err;
1746 
1747         if (tb[IFLA_IFNAME])
1748                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1749         else
1750                 ifname[0] = '\0';
1751 
1752         ifm = nlmsg_data(nlh);
1753         if (ifm->ifi_index > 0)
1754                 dev = __dev_get_by_index(net, ifm->ifi_index);
1755         else {
1756                 if (ifname[0])
1757                         dev = __dev_get_by_name(net, ifname);
1758                 else
1759                         dev = NULL;
1760         }
1761 
1762         err = validate_linkmsg(dev, tb);
1763         if (err < 0)
1764                 return err;
1765 
1766         if (tb[IFLA_LINKINFO]) {
1767                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1768                                        tb[IFLA_LINKINFO], ifla_info_policy);
1769                 if (err < 0)
1770                         return err;
1771         } else
1772                 memset(linkinfo, 0, sizeof(linkinfo));
1773 
1774         if (linkinfo[IFLA_INFO_KIND]) {
1775                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1776                 ops = rtnl_link_ops_get(kind);
1777         } else {
1778                 kind[0] = '\0';
1779                 ops = NULL;
1780         }
1781 
1782         if (1) {
1783                 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1784                 struct net *dest_net;
1785 
1786                 if (ops) {
1787                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1788                                 err = nla_parse_nested(attr, ops->maxtype,
1789                                                        linkinfo[IFLA_INFO_DATA],
1790                                                        ops->policy);
1791                                 if (err < 0)
1792                                         return err;
1793                                 data = attr;
1794                         }
1795                         if (ops->validate) {
1796                                 err = ops->validate(tb, data);
1797                                 if (err < 0)
1798                                         return err;
1799                         }
1800                 }
1801 
1802                 if (dev) {
1803                         int modified = 0;
1804 
1805                         if (nlh->nlmsg_flags & NLM_F_EXCL)
1806                                 return -EEXIST;
1807                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
1808                                 return -EOPNOTSUPP;
1809 
1810                         if (linkinfo[IFLA_INFO_DATA]) {
1811                                 if (!ops || ops != dev->rtnl_link_ops ||
1812                                     !ops->changelink)
1813                                         return -EOPNOTSUPP;
1814 
1815                                 err = ops->changelink(dev, tb, data);
1816                                 if (err < 0)
1817                                         return err;
1818                                 modified = 1;
1819                         }
1820 
1821                         return do_setlink(dev, ifm, tb, ifname, modified);
1822                 }
1823 
1824                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1825                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1826                                 return rtnl_group_changelink(net,
1827                                                 nla_get_u32(tb[IFLA_GROUP]),
1828                                                 ifm, tb);
1829                         return -ENODEV;
1830                 }
1831 
1832                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1833                         return -EOPNOTSUPP;
1834 
1835                 if (!ops) {
1836 #ifdef CONFIG_MODULES
1837                         if (kind[0]) {
1838                                 __rtnl_unlock();
1839                                 request_module("rtnl-link-%s", kind);
1840                                 rtnl_lock();
1841                                 ops = rtnl_link_ops_get(kind);
1842                                 if (ops)
1843                                         goto replay;
1844                         }
1845 #endif
1846                         return -EOPNOTSUPP;
1847                 }
1848 
1849                 if (!ifname[0])
1850                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1851 
1852                 dest_net = rtnl_link_get_net(net, tb);
1853                 if (IS_ERR(dest_net))
1854                         return PTR_ERR(dest_net);
1855 
1856                 dev = rtnl_create_link(dest_net, ifname, ops, tb);
1857                 if (IS_ERR(dev)) {
1858                         err = PTR_ERR(dev);
1859                         goto out;
1860                 }
1861 
1862                 dev->ifindex = ifm->ifi_index;
1863 
1864                 if (ops->newlink)
1865                         err = ops->newlink(net, dev, tb, data);
1866                 else
1867                         err = register_netdevice(dev);
1868 
1869                 if (err < 0) {
1870                         free_netdev(dev);
1871                         goto out;
1872                 }
1873 
1874                 err = rtnl_configure_link(dev, ifm);
1875                 if (err < 0)
1876                         unregister_netdevice(dev);
1877 out:
1878                 put_net(dest_net);
1879                 return err;
1880         }
1881 }
1882 
1883 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
1884 {
1885         struct net *net = sock_net(skb->sk);
1886         struct ifinfomsg *ifm;
1887         char ifname[IFNAMSIZ];
1888         struct nlattr *tb[IFLA_MAX+1];
1889         struct net_device *dev = NULL;
1890         struct sk_buff *nskb;
1891         int err;
1892         u32 ext_filter_mask = 0;
1893 
1894         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1895         if (err < 0)
1896                 return err;
1897 
1898         if (tb[IFLA_IFNAME])
1899                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1900 
1901         if (tb[IFLA_EXT_MASK])
1902                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1903 
1904         ifm = nlmsg_data(nlh);
1905         if (ifm->ifi_index > 0)
1906                 dev = __dev_get_by_index(net, ifm->ifi_index);
1907         else if (tb[IFLA_IFNAME])
1908                 dev = __dev_get_by_name(net, ifname);
1909         else
1910                 return -EINVAL;
1911 
1912         if (dev == NULL)
1913                 return -ENODEV;
1914 
1915         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1916         if (nskb == NULL)
1917                 return -ENOBUFS;
1918 
1919         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
1920                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1921         if (err < 0) {
1922                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1923                 WARN_ON(err == -EMSGSIZE);
1924                 kfree_skb(nskb);
1925         } else
1926                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
1927 
1928         return err;
1929 }
1930 
1931 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1932 {
1933         struct net *net = sock_net(skb->sk);
1934         struct net_device *dev;
1935         struct nlattr *tb[IFLA_MAX+1];
1936         u32 ext_filter_mask = 0;
1937         u16 min_ifinfo_dump_size = 0;
1938 
1939         if (nlmsg_parse(nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
1940                         ifla_policy) >= 0) {
1941                 if (tb[IFLA_EXT_MASK])
1942                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1943         }
1944 
1945         if (!ext_filter_mask)
1946                 return NLMSG_GOODSIZE;
1947         /*
1948          * traverse the list of net devices and compute the minimum
1949          * buffer size based upon the filter mask.
1950          */
1951         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1952                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1953                                              if_nlmsg_size(dev,
1954                                                            ext_filter_mask));
1955         }
1956 
1957         return min_ifinfo_dump_size;
1958 }
1959 
1960 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1961 {
1962         int idx;
1963         int s_idx = cb->family;
1964 
1965         if (s_idx == 0)
1966                 s_idx = 1;
1967         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1968                 int type = cb->nlh->nlmsg_type-RTM_BASE;
1969                 if (idx < s_idx || idx == PF_PACKET)
1970                         continue;
1971                 if (rtnl_msg_handlers[idx] == NULL ||
1972                     rtnl_msg_handlers[idx][type].dumpit == NULL)
1973                         continue;
1974                 if (idx > s_idx) {
1975                         memset(&cb->args[0], 0, sizeof(cb->args));
1976                         cb->prev_seq = 0;
1977                         cb->seq = 0;
1978                 }
1979                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1980                         break;
1981         }
1982         cb->family = idx;
1983 
1984         return skb->len;
1985 }
1986 
1987 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
1988                   gfp_t flags)
1989 {
1990         struct net *net = dev_net(dev);
1991         struct sk_buff *skb;
1992         int err = -ENOBUFS;
1993         size_t if_info_size;
1994 
1995         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
1996         if (skb == NULL)
1997                 goto errout;
1998 
1999         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2000         if (err < 0) {
2001                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2002                 WARN_ON(err == -EMSGSIZE);
2003                 kfree_skb(skb);
2004                 goto errout;
2005         }
2006         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2007         return;
2008 errout:
2009         if (err < 0)
2010                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2011 }
2012 EXPORT_SYMBOL(rtmsg_ifinfo);
2013 
2014 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2015                                    struct net_device *dev,
2016                                    u8 *addr, u32 pid, u32 seq,
2017                                    int type, unsigned int flags,
2018                                    int nlflags)
2019 {
2020         struct nlmsghdr *nlh;
2021         struct ndmsg *ndm;
2022 
2023         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2024         if (!nlh)
2025                 return -EMSGSIZE;
2026 
2027         ndm = nlmsg_data(nlh);
2028         ndm->ndm_family  = AF_BRIDGE;
2029         ndm->ndm_pad1    = 0;
2030         ndm->ndm_pad2    = 0;
2031         ndm->ndm_flags   = flags;
2032         ndm->ndm_type    = 0;
2033         ndm->ndm_ifindex = dev->ifindex;
2034         ndm->ndm_state   = NUD_PERMANENT;
2035 
2036         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2037                 goto nla_put_failure;
2038 
2039         return nlmsg_end(skb, nlh);
2040 
2041 nla_put_failure:
2042         nlmsg_cancel(skb, nlh);
2043         return -EMSGSIZE;
2044 }
2045 
2046 static inline size_t rtnl_fdb_nlmsg_size(void)
2047 {
2048         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2049 }
2050 
2051 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2052 {
2053         struct net *net = dev_net(dev);
2054         struct sk_buff *skb;
2055         int err = -ENOBUFS;
2056 
2057         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2058         if (!skb)
2059                 goto errout;
2060 
2061         err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0);
2062         if (err < 0) {
2063                 kfree_skb(skb);
2064                 goto errout;
2065         }
2066 
2067         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2068         return;
2069 errout:
2070         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2071 }
2072 
2073 /**
2074  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2075  */
2076 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2077                      struct nlattr *tb[],
2078                      struct net_device *dev,
2079                      const unsigned char *addr,
2080                      u16 flags)
2081 {
2082         int err = -EINVAL;
2083 
2084         /* If aging addresses are supported device will need to
2085          * implement its own handler for this.
2086          */
2087         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2088                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2089                 return err;
2090         }
2091 
2092         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2093                 err = dev_uc_add_excl(dev, addr);
2094         else if (is_multicast_ether_addr(addr))
2095                 err = dev_mc_add_excl(dev, addr);
2096 
2097         /* Only return duplicate errors if NLM_F_EXCL is set */
2098         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2099                 err = 0;
2100 
2101         return err;
2102 }
2103 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2104 
2105 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2106 {
2107         struct net *net = sock_net(skb->sk);
2108         struct ndmsg *ndm;
2109         struct nlattr *tb[NDA_MAX+1];
2110         struct net_device *dev;
2111         u8 *addr;
2112         int err;
2113 
2114         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2115         if (err < 0)
2116                 return err;
2117 
2118         ndm = nlmsg_data(nlh);
2119         if (ndm->ndm_ifindex == 0) {
2120                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2121                 return -EINVAL;
2122         }
2123 
2124         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2125         if (dev == NULL) {
2126                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2127                 return -ENODEV;
2128         }
2129 
2130         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2131                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2132                 return -EINVAL;
2133         }
2134 
2135         addr = nla_data(tb[NDA_LLADDR]);
2136 
2137         err = -EOPNOTSUPP;
2138 
2139         /* Support fdb on master device the net/bridge default case */
2140         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2141             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2142                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2143                 const struct net_device_ops *ops = br_dev->netdev_ops;
2144 
2145                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, nlh->nlmsg_flags);
2146                 if (err)
2147                         goto out;
2148                 else
2149                         ndm->ndm_flags &= ~NTF_MASTER;
2150         }
2151 
2152         /* Embedded bridge, macvlan, and any other device support */
2153         if ((ndm->ndm_flags & NTF_SELF)) {
2154                 if (dev->netdev_ops->ndo_fdb_add)
2155                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2156                                                            nlh->nlmsg_flags);
2157                 else
2158                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr,
2159                                                nlh->nlmsg_flags);
2160 
2161                 if (!err) {
2162                         rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2163                         ndm->ndm_flags &= ~NTF_SELF;
2164                 }
2165         }
2166 out:
2167         return err;
2168 }
2169 
2170 /**
2171  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2172  */
2173 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2174                      struct nlattr *tb[],
2175                      struct net_device *dev,
2176                      const unsigned char *addr)
2177 {
2178         int err = -EOPNOTSUPP;
2179 
2180         /* If aging addresses are supported device will need to
2181          * implement its own handler for this.
2182          */
2183         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2184                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2185                 return -EINVAL;
2186         }
2187 
2188         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2189                 err = dev_uc_del(dev, addr);
2190         else if (is_multicast_ether_addr(addr))
2191                 err = dev_mc_del(dev, addr);
2192         else
2193                 err = -EINVAL;
2194 
2195         return err;
2196 }
2197 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2198 
2199 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2200 {
2201         struct net *net = sock_net(skb->sk);
2202         struct ndmsg *ndm;
2203         struct nlattr *tb[NDA_MAX+1];
2204         struct net_device *dev;
2205         int err = -EINVAL;
2206         __u8 *addr;
2207 
2208         if (!capable(CAP_NET_ADMIN))
2209                 return -EPERM;
2210 
2211         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2212         if (err < 0)
2213                 return err;
2214 
2215         ndm = nlmsg_data(nlh);
2216         if (ndm->ndm_ifindex == 0) {
2217                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2218                 return -EINVAL;
2219         }
2220 
2221         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2222         if (dev == NULL) {
2223                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2224                 return -ENODEV;
2225         }
2226 
2227         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2228                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2229                 return -EINVAL;
2230         }
2231 
2232         addr = nla_data(tb[NDA_LLADDR]);
2233 
2234         err = -EOPNOTSUPP;
2235 
2236         /* Support fdb on master device the net/bridge default case */
2237         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2238             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2239                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2240                 const struct net_device_ops *ops = br_dev->netdev_ops;
2241 
2242                 if (ops->ndo_fdb_del)
2243                         err = ops->ndo_fdb_del(ndm, tb, dev, addr);
2244 
2245                 if (err)
2246                         goto out;
2247                 else
2248                         ndm->ndm_flags &= ~NTF_MASTER;
2249         }
2250 
2251         /* Embedded bridge, macvlan, and any other device support */
2252         if (ndm->ndm_flags & NTF_SELF) {
2253                 if (dev->netdev_ops->ndo_fdb_del)
2254                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr);
2255                 else
2256                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr);
2257 
2258                 if (!err) {
2259                         rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2260                         ndm->ndm_flags &= ~NTF_SELF;
2261                 }
2262         }
2263 out:
2264         return err;
2265 }
2266 
2267 static int nlmsg_populate_fdb(struct sk_buff *skb,
2268                               struct netlink_callback *cb,
2269                               struct net_device *dev,
2270                               int *idx,
2271                               struct netdev_hw_addr_list *list)
2272 {
2273         struct netdev_hw_addr *ha;
2274         int err;
2275         u32 portid, seq;
2276 
2277         portid = NETLINK_CB(cb->skb).portid;
2278         seq = cb->nlh->nlmsg_seq;
2279 
2280         list_for_each_entry(ha, &list->list, list) {
2281                 if (*idx < cb->args[0])
2282                         goto skip;
2283 
2284                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2285                                               portid, seq,
2286                                               RTM_NEWNEIGH, NTF_SELF,
2287                                               NLM_F_MULTI);
2288                 if (err < 0)
2289                         return err;
2290 skip:
2291                 *idx += 1;
2292         }
2293         return 0;
2294 }
2295 
2296 /**
2297  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2298  * @nlh: netlink message header
2299  * @dev: netdevice
2300  *
2301  * Default netdevice operation to dump the existing unicast address list.
2302  * Returns number of addresses from list put in skb.
2303  */
2304 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2305                       struct netlink_callback *cb,
2306                       struct net_device *dev,
2307                       int idx)
2308 {
2309         int err;
2310 
2311         netif_addr_lock_bh(dev);
2312         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2313         if (err)
2314                 goto out;
2315         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2316 out:
2317         netif_addr_unlock_bh(dev);
2318         return idx;
2319 }
2320 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2321 
2322 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2323 {
2324         int idx = 0;
2325         struct net *net = sock_net(skb->sk);
2326         struct net_device *dev;
2327 
2328         rcu_read_lock();
2329         for_each_netdev_rcu(net, dev) {
2330                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2331                         struct net_device *br_dev;
2332                         const struct net_device_ops *ops;
2333 
2334                         br_dev = netdev_master_upper_dev_get(dev);
2335                         ops = br_dev->netdev_ops;
2336                         if (ops->ndo_fdb_dump)
2337                                 idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
2338                 }
2339 
2340                 if (dev->netdev_ops->ndo_fdb_dump)
2341                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
2342                 else
2343                         idx = ndo_dflt_fdb_dump(skb, cb, dev, idx);
2344         }
2345         rcu_read_unlock();
2346 
2347         cb->args[0] = idx;
2348         return skb->len;
2349 }
2350 
2351 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2352                             struct net_device *dev, u16 mode)
2353 {
2354         struct nlmsghdr *nlh;
2355         struct ifinfomsg *ifm;
2356         struct nlattr *br_afspec;
2357         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2358         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2359 
2360         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2361         if (nlh == NULL)
2362                 return -EMSGSIZE;
2363 
2364         ifm = nlmsg_data(nlh);
2365         ifm->ifi_family = AF_BRIDGE;
2366         ifm->__ifi_pad = 0;
2367         ifm->ifi_type = dev->type;
2368         ifm->ifi_index = dev->ifindex;
2369         ifm->ifi_flags = dev_get_flags(dev);
2370         ifm->ifi_change = 0;
2371 
2372 
2373         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2374             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2375             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2376             (br_dev &&
2377              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2378             (dev->addr_len &&
2379              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2380             (dev->ifindex != dev->iflink &&
2381              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2382                 goto nla_put_failure;
2383 
2384         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2385         if (!br_afspec)
2386                 goto nla_put_failure;
2387 
2388         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF) ||
2389             nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2390                 nla_nest_cancel(skb, br_afspec);
2391                 goto nla_put_failure;
2392         }
2393         nla_nest_end(skb, br_afspec);
2394 
2395         return nlmsg_end(skb, nlh);
2396 nla_put_failure:
2397         nlmsg_cancel(skb, nlh);
2398         return -EMSGSIZE;
2399 }
2400 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2401 
2402 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2403 {
2404         struct net *net = sock_net(skb->sk);
2405         struct net_device *dev;
2406         int idx = 0;
2407         u32 portid = NETLINK_CB(cb->skb).portid;
2408         u32 seq = cb->nlh->nlmsg_seq;
2409         struct nlattr *extfilt;
2410         u32 filter_mask = 0;
2411 
2412         extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2413                                   IFLA_EXT_MASK);
2414         if (extfilt)
2415                 filter_mask = nla_get_u32(extfilt);
2416 
2417         rcu_read_lock();
2418         for_each_netdev_rcu(net, dev) {
2419                 const struct net_device_ops *ops = dev->netdev_ops;
2420                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2421 
2422                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2423                         if (idx >= cb->args[0] &&
2424                             br_dev->netdev_ops->ndo_bridge_getlink(
2425                                     skb, portid, seq, dev, filter_mask) < 0)
2426                                 break;
2427                         idx++;
2428                 }
2429 
2430                 if (ops->ndo_bridge_getlink) {
2431                         if (idx >= cb->args[0] &&
2432                             ops->ndo_bridge_getlink(skb, portid, seq, dev,
2433                                                     filter_mask) < 0)
2434                                 break;
2435                         idx++;
2436                 }
2437         }
2438         rcu_read_unlock();
2439         cb->args[0] = idx;
2440 
2441         return skb->len;
2442 }
2443 
2444 static inline size_t bridge_nlmsg_size(void)
2445 {
2446         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2447                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
2448                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
2449                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
2450                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
2451                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
2452                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
2453                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
2454                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2455                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
2456                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
2457 }
2458 
2459 static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
2460 {
2461         struct net *net = dev_net(dev);
2462         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2463         struct sk_buff *skb;
2464         int err = -EOPNOTSUPP;
2465 
2466         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2467         if (!skb) {
2468                 err = -ENOMEM;
2469                 goto errout;
2470         }
2471 
2472         if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
2473             br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2474                 err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2475                 if (err < 0)
2476                         goto errout;
2477         }
2478 
2479         if ((flags & BRIDGE_FLAGS_SELF) &&
2480             dev->netdev_ops->ndo_bridge_getlink) {
2481                 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
2482                 if (err < 0)
2483                         goto errout;
2484         }
2485 
2486         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
2487         return 0;
2488 errout:
2489         WARN_ON(err == -EMSGSIZE);
2490         kfree_skb(skb);
2491         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2492         return err;
2493 }
2494 
2495 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2496 {
2497         struct net *net = sock_net(skb->sk);
2498         struct ifinfomsg *ifm;
2499         struct net_device *dev;
2500         struct nlattr *br_spec, *attr = NULL;
2501         int rem, err = -EOPNOTSUPP;
2502         u16 oflags, flags = 0;
2503         bool have_flags = false;
2504 
2505         if (nlmsg_len(nlh) < sizeof(*ifm))
2506                 return -EINVAL;
2507 
2508         ifm = nlmsg_data(nlh);
2509         if (ifm->ifi_family != AF_BRIDGE)
2510                 return -EPFNOSUPPORT;
2511 
2512         dev = __dev_get_by_index(net, ifm->ifi_index);
2513         if (!dev) {
2514                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2515                 return -ENODEV;
2516         }
2517 
2518         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2519         if (br_spec) {
2520                 nla_for_each_nested(attr, br_spec, rem) {
2521                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2522                                 have_flags = true;
2523                                 flags = nla_get_u16(attr);
2524                                 break;
2525                         }
2526                 }
2527         }
2528 
2529         oflags = flags;
2530 
2531         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2532                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2533 
2534                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
2535                         err = -EOPNOTSUPP;
2536                         goto out;
2537                 }
2538 
2539                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2540                 if (err)
2541                         goto out;
2542 
2543                 flags &= ~BRIDGE_FLAGS_MASTER;
2544         }
2545 
2546         if ((flags & BRIDGE_FLAGS_SELF)) {
2547                 if (!dev->netdev_ops->ndo_bridge_setlink)
2548                         err = -EOPNOTSUPP;
2549                 else
2550                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh);
2551 
2552                 if (!err)
2553                         flags &= ~BRIDGE_FLAGS_SELF;
2554         }
2555 
2556         if (have_flags)
2557                 memcpy(nla_data(attr), &flags, sizeof(flags));
2558         /* Generate event to notify upper layer of bridge change */
2559         if (!err)
2560                 err = rtnl_bridge_notify(dev, oflags);
2561 out:
2562         return err;
2563 }
2564 
2565 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
2566 {
2567         struct net *net = sock_net(skb->sk);
2568         struct ifinfomsg *ifm;
2569         struct net_device *dev;
2570         struct nlattr *br_spec, *attr = NULL;
2571         int rem, err = -EOPNOTSUPP;
2572         u16 oflags, flags = 0;
2573         bool have_flags = false;
2574 
2575         if (nlmsg_len(nlh) < sizeof(*ifm))
2576                 return -EINVAL;
2577 
2578         ifm = nlmsg_data(nlh);
2579         if (ifm->ifi_family != AF_BRIDGE)
2580                 return -EPFNOSUPPORT;
2581 
2582         dev = __dev_get_by_index(net, ifm->ifi_index);
2583         if (!dev) {
2584                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
2585                 return -ENODEV;
2586         }
2587 
2588         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
2589         if (br_spec) {
2590                 nla_for_each_nested(attr, br_spec, rem) {
2591                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
2592                                 have_flags = true;
2593                                 flags = nla_get_u16(attr);
2594                                 break;
2595                         }
2596                 }
2597         }
2598 
2599         oflags = flags;
2600 
2601         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
2602                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2603 
2604                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
2605                         err = -EOPNOTSUPP;
2606                         goto out;
2607                 }
2608 
2609                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2610                 if (err)
2611                         goto out;
2612 
2613                 flags &= ~BRIDGE_FLAGS_MASTER;
2614         }
2615 
2616         if ((flags & BRIDGE_FLAGS_SELF)) {
2617                 if (!dev->netdev_ops->ndo_bridge_dellink)
2618                         err = -EOPNOTSUPP;
2619                 else
2620                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh);
2621 
2622                 if (!err)
2623                         flags &= ~BRIDGE_FLAGS_SELF;
2624         }
2625 
2626         if (have_flags)
2627                 memcpy(nla_data(attr), &flags, sizeof(flags));
2628         /* Generate event to notify upper layer of bridge change */
2629         if (!err)
2630                 err = rtnl_bridge_notify(dev, oflags);
2631 out:
2632         return err;
2633 }
2634 
2635 /* Process one rtnetlink message. */
2636 
2637 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2638 {
2639         struct net *net = sock_net(skb->sk);
2640         rtnl_doit_func doit;
2641         int sz_idx, kind;
2642         int family;
2643         int type;
2644         int err;
2645 
2646         type = nlh->nlmsg_type;
2647         if (type > RTM_MAX)
2648                 return -EOPNOTSUPP;
2649 
2650         type -= RTM_BASE;
2651 
2652         /* All the messages must have at least 1 byte length */
2653         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
2654                 return 0;
2655 
2656         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2657         sz_idx = type>>2;
2658         kind = type&3;
2659 
2660         if (kind != 2 && !ns_capable(net->user_ns, CAP_NET_ADMIN))
2661                 return -EPERM;
2662 
2663         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2664                 struct sock *rtnl;
2665                 rtnl_dumpit_func dumpit;
2666                 rtnl_calcit_func calcit;
2667                 u16 min_dump_alloc = 0;
2668 
2669                 dumpit = rtnl_get_dumpit(family, type);
2670                 if (dumpit == NULL)
2671                         return -EOPNOTSUPP;
2672                 calcit = rtnl_get_calcit(family, type);
2673                 if (calcit)
2674                         min_dump_alloc = calcit(skb, nlh);
2675 
2676                 __rtnl_unlock();
2677                 rtnl = net->rtnl;
2678                 {
2679                         struct netlink_dump_control c = {
2680                                 .dump           = dumpit,
2681                                 .min_dump_alloc = min_dump_alloc,
2682                         };
2683                         err = netlink_dump_start(rtnl, skb, nlh, &c);
2684                 }
2685                 rtnl_lock();
2686                 return err;
2687         }
2688 
2689         doit = rtnl_get_doit(family, type);
2690         if (doit == NULL)
2691                 return -EOPNOTSUPP;
2692 
2693         return doit(skb, nlh);
2694 }
2695 
2696 static void rtnetlink_rcv(struct sk_buff *skb)
2697 {
2698         rtnl_lock();
2699         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2700         rtnl_unlock();
2701 }
2702 
2703 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2704 {
2705         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2706 
2707         switch (event) {
2708         case NETDEV_UP:
2709         case NETDEV_DOWN:
2710         case NETDEV_PRE_UP:
2711         case NETDEV_POST_INIT:
2712         case NETDEV_REGISTER:
2713         case NETDEV_CHANGE:
2714         case NETDEV_PRE_TYPE_CHANGE:
2715         case NETDEV_GOING_DOWN:
2716         case NETDEV_UNREGISTER:
2717         case NETDEV_UNREGISTER_FINAL:
2718         case NETDEV_RELEASE:
2719         case NETDEV_JOIN:
2720                 break;
2721         default:
2722                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
2723                 break;
2724         }
2725         return NOTIFY_DONE;
2726 }
2727 
2728 static struct notifier_block rtnetlink_dev_notifier = {
2729         .notifier_call  = rtnetlink_event,
2730 };
2731 
2732 
2733 static int __net_init rtnetlink_net_init(struct net *net)
2734 {
2735         struct sock *sk;
2736         struct netlink_kernel_cfg cfg = {
2737                 .groups         = RTNLGRP_MAX,
2738                 .input          = rtnetlink_rcv,
2739                 .cb_mutex       = &rtnl_mutex,
2740                 .flags          = NL_CFG_F_NONROOT_RECV,
2741         };
2742 
2743         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
2744         if (!sk)
2745                 return -ENOMEM;
2746         net->rtnl = sk;
2747         return 0;
2748 }
2749 
2750 static void __net_exit rtnetlink_net_exit(struct net *net)
2751 {
2752         netlink_kernel_release(net->rtnl);
2753         net->rtnl = NULL;
2754 }
2755 
2756 static struct pernet_operations rtnetlink_net_ops = {
2757         .init = rtnetlink_net_init,
2758         .exit = rtnetlink_net_exit,
2759 };
2760 
2761 void __init rtnetlink_init(void)
2762 {
2763         if (register_pernet_subsys(&rtnetlink_net_ops))
2764                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2765 
2766         register_netdevice_notifier(&rtnetlink_dev_notifier);
2767 
2768         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2769                       rtnl_dump_ifinfo, rtnl_calcit);
2770         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2771         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2772         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2773 
2774         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2775         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2776 
2777         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
2778         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
2779         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
2780 
2781         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
2782         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
2783         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
2784 }
2785 
2786 

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