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rtnetlink: Fix problem with buffer allocation
[deliverable/linux.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/pci.h>
39
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42
43 #include <linux/inet.h>
44 #include <linux/netdevice.h>
45 #include <net/ip.h>
46 #include <net/protocol.h>
47 #include <net/arp.h>
48 #include <net/route.h>
49 #include <net/udp.h>
50 #include <net/sock.h>
51 #include <net/pkt_sched.h>
52 #include <net/fib_rules.h>
53 #include <net/rtnetlink.h>
54 #include <net/net_namespace.h>
55
56 struct rtnl_link {
57 rtnl_doit_func doit;
58 rtnl_dumpit_func dumpit;
59 rtnl_calcit_func calcit;
60 };
61
62 static DEFINE_MUTEX(rtnl_mutex);
63
64 void rtnl_lock(void)
65 {
66 mutex_lock(&rtnl_mutex);
67 }
68 EXPORT_SYMBOL(rtnl_lock);
69
70 void __rtnl_unlock(void)
71 {
72 mutex_unlock(&rtnl_mutex);
73 }
74
75 void rtnl_unlock(void)
76 {
77 /* This fellow will unlock it for us. */
78 netdev_run_todo();
79 }
80 EXPORT_SYMBOL(rtnl_unlock);
81
82 int rtnl_trylock(void)
83 {
84 return mutex_trylock(&rtnl_mutex);
85 }
86 EXPORT_SYMBOL(rtnl_trylock);
87
88 int rtnl_is_locked(void)
89 {
90 return mutex_is_locked(&rtnl_mutex);
91 }
92 EXPORT_SYMBOL(rtnl_is_locked);
93
94 #ifdef CONFIG_PROVE_LOCKING
95 int lockdep_rtnl_is_held(void)
96 {
97 return lockdep_is_held(&rtnl_mutex);
98 }
99 EXPORT_SYMBOL(lockdep_rtnl_is_held);
100 #endif /* #ifdef CONFIG_PROVE_LOCKING */
101
102 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
103
104 static inline int rtm_msgindex(int msgtype)
105 {
106 int msgindex = msgtype - RTM_BASE;
107
108 /*
109 * msgindex < 0 implies someone tried to register a netlink
110 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
111 * the message type has not been added to linux/rtnetlink.h
112 */
113 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
114
115 return msgindex;
116 }
117
118 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
119 {
120 struct rtnl_link *tab;
121
122 if (protocol <= RTNL_FAMILY_MAX)
123 tab = rtnl_msg_handlers[protocol];
124 else
125 tab = NULL;
126
127 if (tab == NULL || tab[msgindex].doit == NULL)
128 tab = rtnl_msg_handlers[PF_UNSPEC];
129
130 return tab ? tab[msgindex].doit : NULL;
131 }
132
133 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
134 {
135 struct rtnl_link *tab;
136
137 if (protocol <= RTNL_FAMILY_MAX)
138 tab = rtnl_msg_handlers[protocol];
139 else
140 tab = NULL;
141
142 if (tab == NULL || tab[msgindex].dumpit == NULL)
143 tab = rtnl_msg_handlers[PF_UNSPEC];
144
145 return tab ? tab[msgindex].dumpit : NULL;
146 }
147
148 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
149 {
150 struct rtnl_link *tab;
151
152 if (protocol <= RTNL_FAMILY_MAX)
153 tab = rtnl_msg_handlers[protocol];
154 else
155 tab = NULL;
156
157 if (tab == NULL || tab[msgindex].calcit == NULL)
158 tab = rtnl_msg_handlers[PF_UNSPEC];
159
160 return tab ? tab[msgindex].calcit : NULL;
161 }
162
163 /**
164 * __rtnl_register - Register a rtnetlink message type
165 * @protocol: Protocol family or PF_UNSPEC
166 * @msgtype: rtnetlink message type
167 * @doit: Function pointer called for each request message
168 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
169 * @calcit: Function pointer to calc size of dump message
170 *
171 * Registers the specified function pointers (at least one of them has
172 * to be non-NULL) to be called whenever a request message for the
173 * specified protocol family and message type is received.
174 *
175 * The special protocol family PF_UNSPEC may be used to define fallback
176 * function pointers for the case when no entry for the specific protocol
177 * family exists.
178 *
179 * Returns 0 on success or a negative error code.
180 */
181 int __rtnl_register(int protocol, int msgtype,
182 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
183 rtnl_calcit_func calcit)
184 {
185 struct rtnl_link *tab;
186 int msgindex;
187
188 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
189 msgindex = rtm_msgindex(msgtype);
190
191 tab = rtnl_msg_handlers[protocol];
192 if (tab == NULL) {
193 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
194 if (tab == NULL)
195 return -ENOBUFS;
196
197 rtnl_msg_handlers[protocol] = tab;
198 }
199
200 if (doit)
201 tab[msgindex].doit = doit;
202
203 if (dumpit)
204 tab[msgindex].dumpit = dumpit;
205
206 if (calcit)
207 tab[msgindex].calcit = calcit;
208
209 return 0;
210 }
211 EXPORT_SYMBOL_GPL(__rtnl_register);
212
213 /**
214 * rtnl_register - Register a rtnetlink message type
215 *
216 * Identical to __rtnl_register() but panics on failure. This is useful
217 * as failure of this function is very unlikely, it can only happen due
218 * to lack of memory when allocating the chain to store all message
219 * handlers for a protocol. Meant for use in init functions where lack
220 * of memory implies no sense in continuing.
221 */
222 void rtnl_register(int protocol, int msgtype,
223 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
224 rtnl_calcit_func calcit)
225 {
226 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
227 panic("Unable to register rtnetlink message handler, "
228 "protocol = %d, message type = %d\n",
229 protocol, msgtype);
230 }
231 EXPORT_SYMBOL_GPL(rtnl_register);
232
233 /**
234 * rtnl_unregister - Unregister a rtnetlink message type
235 * @protocol: Protocol family or PF_UNSPEC
236 * @msgtype: rtnetlink message type
237 *
238 * Returns 0 on success or a negative error code.
239 */
240 int rtnl_unregister(int protocol, int msgtype)
241 {
242 int msgindex;
243
244 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
245 msgindex = rtm_msgindex(msgtype);
246
247 if (rtnl_msg_handlers[protocol] == NULL)
248 return -ENOENT;
249
250 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
251 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
252
253 return 0;
254 }
255 EXPORT_SYMBOL_GPL(rtnl_unregister);
256
257 /**
258 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
259 * @protocol : Protocol family or PF_UNSPEC
260 *
261 * Identical to calling rtnl_unregster() for all registered message types
262 * of a certain protocol family.
263 */
264 void rtnl_unregister_all(int protocol)
265 {
266 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
267
268 kfree(rtnl_msg_handlers[protocol]);
269 rtnl_msg_handlers[protocol] = NULL;
270 }
271 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
272
273 static LIST_HEAD(link_ops);
274
275 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
276 {
277 const struct rtnl_link_ops *ops;
278
279 list_for_each_entry(ops, &link_ops, list) {
280 if (!strcmp(ops->kind, kind))
281 return ops;
282 }
283 return NULL;
284 }
285
286 /**
287 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
288 * @ops: struct rtnl_link_ops * to register
289 *
290 * The caller must hold the rtnl_mutex. This function should be used
291 * by drivers that create devices during module initialization. It
292 * must be called before registering the devices.
293 *
294 * Returns 0 on success or a negative error code.
295 */
296 int __rtnl_link_register(struct rtnl_link_ops *ops)
297 {
298 if (rtnl_link_ops_get(ops->kind))
299 return -EEXIST;
300
301 if (!ops->dellink)
302 ops->dellink = unregister_netdevice_queue;
303
304 list_add_tail(&ops->list, &link_ops);
305 return 0;
306 }
307 EXPORT_SYMBOL_GPL(__rtnl_link_register);
308
309 /**
310 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
311 * @ops: struct rtnl_link_ops * to register
312 *
313 * Returns 0 on success or a negative error code.
314 */
315 int rtnl_link_register(struct rtnl_link_ops *ops)
316 {
317 int err;
318
319 rtnl_lock();
320 err = __rtnl_link_register(ops);
321 rtnl_unlock();
322 return err;
323 }
324 EXPORT_SYMBOL_GPL(rtnl_link_register);
325
326 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
327 {
328 struct net_device *dev;
329 LIST_HEAD(list_kill);
330
331 for_each_netdev(net, dev) {
332 if (dev->rtnl_link_ops == ops)
333 ops->dellink(dev, &list_kill);
334 }
335 unregister_netdevice_many(&list_kill);
336 }
337
338 /**
339 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
340 * @ops: struct rtnl_link_ops * to unregister
341 *
342 * The caller must hold the rtnl_mutex.
343 */
344 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
345 {
346 struct net *net;
347
348 for_each_net(net) {
349 __rtnl_kill_links(net, ops);
350 }
351 list_del(&ops->list);
352 }
353 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
354
355 /**
356 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
357 * @ops: struct rtnl_link_ops * to unregister
358 */
359 void rtnl_link_unregister(struct rtnl_link_ops *ops)
360 {
361 rtnl_lock();
362 __rtnl_link_unregister(ops);
363 rtnl_unlock();
364 }
365 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
366
367 static size_t rtnl_link_get_size(const struct net_device *dev)
368 {
369 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
370 size_t size;
371
372 if (!ops)
373 return 0;
374
375 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
376 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
377
378 if (ops->get_size)
379 /* IFLA_INFO_DATA + nested data */
380 size += nla_total_size(sizeof(struct nlattr)) +
381 ops->get_size(dev);
382
383 if (ops->get_xstats_size)
384 /* IFLA_INFO_XSTATS */
385 size += nla_total_size(ops->get_xstats_size(dev));
386
387 return size;
388 }
389
390 static LIST_HEAD(rtnl_af_ops);
391
392 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
393 {
394 const struct rtnl_af_ops *ops;
395
396 list_for_each_entry(ops, &rtnl_af_ops, list) {
397 if (ops->family == family)
398 return ops;
399 }
400
401 return NULL;
402 }
403
404 /**
405 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
406 * @ops: struct rtnl_af_ops * to register
407 *
408 * The caller must hold the rtnl_mutex.
409 *
410 * Returns 0 on success or a negative error code.
411 */
412 int __rtnl_af_register(struct rtnl_af_ops *ops)
413 {
414 list_add_tail(&ops->list, &rtnl_af_ops);
415 return 0;
416 }
417 EXPORT_SYMBOL_GPL(__rtnl_af_register);
418
419 /**
420 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
421 * @ops: struct rtnl_af_ops * to register
422 *
423 * Returns 0 on success or a negative error code.
424 */
425 int rtnl_af_register(struct rtnl_af_ops *ops)
426 {
427 int err;
428
429 rtnl_lock();
430 err = __rtnl_af_register(ops);
431 rtnl_unlock();
432 return err;
433 }
434 EXPORT_SYMBOL_GPL(rtnl_af_register);
435
436 /**
437 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
438 * @ops: struct rtnl_af_ops * to unregister
439 *
440 * The caller must hold the rtnl_mutex.
441 */
442 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
443 {
444 list_del(&ops->list);
445 }
446 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
447
448 /**
449 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
450 * @ops: struct rtnl_af_ops * to unregister
451 */
452 void rtnl_af_unregister(struct rtnl_af_ops *ops)
453 {
454 rtnl_lock();
455 __rtnl_af_unregister(ops);
456 rtnl_unlock();
457 }
458 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
459
460 static size_t rtnl_link_get_af_size(const struct net_device *dev)
461 {
462 struct rtnl_af_ops *af_ops;
463 size_t size;
464
465 /* IFLA_AF_SPEC */
466 size = nla_total_size(sizeof(struct nlattr));
467
468 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
469 if (af_ops->get_link_af_size) {
470 /* AF_* + nested data */
471 size += nla_total_size(sizeof(struct nlattr)) +
472 af_ops->get_link_af_size(dev);
473 }
474 }
475
476 return size;
477 }
478
479 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
480 {
481 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
482 struct nlattr *linkinfo, *data;
483 int err = -EMSGSIZE;
484
485 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
486 if (linkinfo == NULL)
487 goto out;
488
489 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
490 goto err_cancel_link;
491 if (ops->fill_xstats) {
492 err = ops->fill_xstats(skb, dev);
493 if (err < 0)
494 goto err_cancel_link;
495 }
496 if (ops->fill_info) {
497 data = nla_nest_start(skb, IFLA_INFO_DATA);
498 if (data == NULL)
499 goto err_cancel_link;
500 err = ops->fill_info(skb, dev);
501 if (err < 0)
502 goto err_cancel_data;
503 nla_nest_end(skb, data);
504 }
505
506 nla_nest_end(skb, linkinfo);
507 return 0;
508
509 err_cancel_data:
510 nla_nest_cancel(skb, data);
511 err_cancel_link:
512 nla_nest_cancel(skb, linkinfo);
513 out:
514 return err;
515 }
516
517 static const int rtm_min[RTM_NR_FAMILIES] =
518 {
519 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
520 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
521 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
522 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
523 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
524 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
525 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
526 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
527 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
528 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
529 };
530
531 static const int rta_max[RTM_NR_FAMILIES] =
532 {
533 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
534 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
535 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
536 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
537 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
538 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
539 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
540 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
541 };
542
543 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
544 {
545 struct rtattr *rta;
546 int size = RTA_LENGTH(attrlen);
547
548 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
549 rta->rta_type = attrtype;
550 rta->rta_len = size;
551 memcpy(RTA_DATA(rta), data, attrlen);
552 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
553 }
554 EXPORT_SYMBOL(__rta_fill);
555
556 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
557 {
558 struct sock *rtnl = net->rtnl;
559 int err = 0;
560
561 NETLINK_CB(skb).dst_group = group;
562 if (echo)
563 atomic_inc(&skb->users);
564 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
565 if (echo)
566 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
567 return err;
568 }
569
570 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
571 {
572 struct sock *rtnl = net->rtnl;
573
574 return nlmsg_unicast(rtnl, skb, pid);
575 }
576 EXPORT_SYMBOL(rtnl_unicast);
577
578 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
579 struct nlmsghdr *nlh, gfp_t flags)
580 {
581 struct sock *rtnl = net->rtnl;
582 int report = 0;
583
584 if (nlh)
585 report = nlmsg_report(nlh);
586
587 nlmsg_notify(rtnl, skb, pid, group, report, flags);
588 }
589 EXPORT_SYMBOL(rtnl_notify);
590
591 void rtnl_set_sk_err(struct net *net, u32 group, int error)
592 {
593 struct sock *rtnl = net->rtnl;
594
595 netlink_set_err(rtnl, 0, group, error);
596 }
597 EXPORT_SYMBOL(rtnl_set_sk_err);
598
599 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
600 {
601 struct nlattr *mx;
602 int i, valid = 0;
603
604 mx = nla_nest_start(skb, RTA_METRICS);
605 if (mx == NULL)
606 return -ENOBUFS;
607
608 for (i = 0; i < RTAX_MAX; i++) {
609 if (metrics[i]) {
610 valid++;
611 NLA_PUT_U32(skb, i+1, metrics[i]);
612 }
613 }
614
615 if (!valid) {
616 nla_nest_cancel(skb, mx);
617 return 0;
618 }
619
620 return nla_nest_end(skb, mx);
621
622 nla_put_failure:
623 nla_nest_cancel(skb, mx);
624 return -EMSGSIZE;
625 }
626 EXPORT_SYMBOL(rtnetlink_put_metrics);
627
628 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
629 u32 ts, u32 tsage, long expires, u32 error)
630 {
631 struct rta_cacheinfo ci = {
632 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
633 .rta_used = dst->__use,
634 .rta_clntref = atomic_read(&(dst->__refcnt)),
635 .rta_error = error,
636 .rta_id = id,
637 .rta_ts = ts,
638 .rta_tsage = tsage,
639 };
640
641 if (expires)
642 ci.rta_expires = jiffies_to_clock_t(expires);
643
644 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
645 }
646 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
647
648 static void set_operstate(struct net_device *dev, unsigned char transition)
649 {
650 unsigned char operstate = dev->operstate;
651
652 switch (transition) {
653 case IF_OPER_UP:
654 if ((operstate == IF_OPER_DORMANT ||
655 operstate == IF_OPER_UNKNOWN) &&
656 !netif_dormant(dev))
657 operstate = IF_OPER_UP;
658 break;
659
660 case IF_OPER_DORMANT:
661 if (operstate == IF_OPER_UP ||
662 operstate == IF_OPER_UNKNOWN)
663 operstate = IF_OPER_DORMANT;
664 break;
665 }
666
667 if (dev->operstate != operstate) {
668 write_lock_bh(&dev_base_lock);
669 dev->operstate = operstate;
670 write_unlock_bh(&dev_base_lock);
671 netdev_state_change(dev);
672 }
673 }
674
675 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
676 const struct ifinfomsg *ifm)
677 {
678 unsigned int flags = ifm->ifi_flags;
679
680 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
681 if (ifm->ifi_change)
682 flags = (flags & ifm->ifi_change) |
683 (dev->flags & ~ifm->ifi_change);
684
685 return flags;
686 }
687
688 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
689 const struct rtnl_link_stats64 *b)
690 {
691 a->rx_packets = b->rx_packets;
692 a->tx_packets = b->tx_packets;
693 a->rx_bytes = b->rx_bytes;
694 a->tx_bytes = b->tx_bytes;
695 a->rx_errors = b->rx_errors;
696 a->tx_errors = b->tx_errors;
697 a->rx_dropped = b->rx_dropped;
698 a->tx_dropped = b->tx_dropped;
699
700 a->multicast = b->multicast;
701 a->collisions = b->collisions;
702
703 a->rx_length_errors = b->rx_length_errors;
704 a->rx_over_errors = b->rx_over_errors;
705 a->rx_crc_errors = b->rx_crc_errors;
706 a->rx_frame_errors = b->rx_frame_errors;
707 a->rx_fifo_errors = b->rx_fifo_errors;
708 a->rx_missed_errors = b->rx_missed_errors;
709
710 a->tx_aborted_errors = b->tx_aborted_errors;
711 a->tx_carrier_errors = b->tx_carrier_errors;
712 a->tx_fifo_errors = b->tx_fifo_errors;
713 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
714 a->tx_window_errors = b->tx_window_errors;
715
716 a->rx_compressed = b->rx_compressed;
717 a->tx_compressed = b->tx_compressed;
718 }
719
720 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
721 {
722 memcpy(v, b, sizeof(*b));
723 }
724
725 /* All VF info */
726 static inline int rtnl_vfinfo_size(const struct net_device *dev,
727 u32 ext_filter_mask)
728 {
729 if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
730 (ext_filter_mask & RTEXT_FILTER_VF)) {
731 int num_vfs = dev_num_vf(dev->dev.parent);
732 size_t size = nla_total_size(sizeof(struct nlattr));
733 size += nla_total_size(num_vfs * sizeof(struct nlattr));
734 size += num_vfs *
735 (nla_total_size(sizeof(struct ifla_vf_mac)) +
736 nla_total_size(sizeof(struct ifla_vf_vlan)) +
737 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
738 nla_total_size(sizeof(struct ifla_vf_spoofchk)));
739 return size;
740 } else
741 return 0;
742 }
743
744 static size_t rtnl_port_size(const struct net_device *dev)
745 {
746 size_t port_size = nla_total_size(4) /* PORT_VF */
747 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
748 + nla_total_size(sizeof(struct ifla_port_vsi))
749 /* PORT_VSI_TYPE */
750 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
751 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
752 + nla_total_size(1) /* PROT_VDP_REQUEST */
753 + nla_total_size(2); /* PORT_VDP_RESPONSE */
754 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
755 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
756 + port_size;
757 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
758 + port_size;
759
760 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
761 return 0;
762 if (dev_num_vf(dev->dev.parent))
763 return port_self_size + vf_ports_size +
764 vf_port_size * dev_num_vf(dev->dev.parent);
765 else
766 return port_self_size;
767 }
768
769 static noinline size_t if_nlmsg_size(const struct net_device *dev,
770 u32 ext_filter_mask)
771 {
772 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
773 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
774 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
775 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
776 + nla_total_size(sizeof(struct rtnl_link_ifmap))
777 + nla_total_size(sizeof(struct rtnl_link_stats))
778 + nla_total_size(sizeof(struct rtnl_link_stats64))
779 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
780 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
781 + nla_total_size(4) /* IFLA_TXQLEN */
782 + nla_total_size(4) /* IFLA_WEIGHT */
783 + nla_total_size(4) /* IFLA_MTU */
784 + nla_total_size(4) /* IFLA_LINK */
785 + nla_total_size(4) /* IFLA_MASTER */
786 + nla_total_size(1) /* IFLA_OPERSTATE */
787 + nla_total_size(1) /* IFLA_LINKMODE */
788 + nla_total_size(ext_filter_mask
789 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
790 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
791 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
792 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
793 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
794 }
795
796 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
797 {
798 struct nlattr *vf_ports;
799 struct nlattr *vf_port;
800 int vf;
801 int err;
802
803 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
804 if (!vf_ports)
805 return -EMSGSIZE;
806
807 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
808 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
809 if (!vf_port)
810 goto nla_put_failure;
811 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
812 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
813 if (err == -EMSGSIZE)
814 goto nla_put_failure;
815 if (err) {
816 nla_nest_cancel(skb, vf_port);
817 continue;
818 }
819 nla_nest_end(skb, vf_port);
820 }
821
822 nla_nest_end(skb, vf_ports);
823
824 return 0;
825
826 nla_put_failure:
827 nla_nest_cancel(skb, vf_ports);
828 return -EMSGSIZE;
829 }
830
831 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
832 {
833 struct nlattr *port_self;
834 int err;
835
836 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
837 if (!port_self)
838 return -EMSGSIZE;
839
840 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
841 if (err) {
842 nla_nest_cancel(skb, port_self);
843 return (err == -EMSGSIZE) ? err : 0;
844 }
845
846 nla_nest_end(skb, port_self);
847
848 return 0;
849 }
850
851 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
852 {
853 int err;
854
855 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
856 return 0;
857
858 err = rtnl_port_self_fill(skb, dev);
859 if (err)
860 return err;
861
862 if (dev_num_vf(dev->dev.parent)) {
863 err = rtnl_vf_ports_fill(skb, dev);
864 if (err)
865 return err;
866 }
867
868 return 0;
869 }
870
871 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
872 int type, u32 pid, u32 seq, u32 change,
873 unsigned int flags, u32 ext_filter_mask)
874 {
875 struct ifinfomsg *ifm;
876 struct nlmsghdr *nlh;
877 struct rtnl_link_stats64 temp;
878 const struct rtnl_link_stats64 *stats;
879 struct nlattr *attr, *af_spec;
880 struct rtnl_af_ops *af_ops;
881
882 ASSERT_RTNL();
883 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
884 if (nlh == NULL)
885 return -EMSGSIZE;
886
887 ifm = nlmsg_data(nlh);
888 ifm->ifi_family = AF_UNSPEC;
889 ifm->__ifi_pad = 0;
890 ifm->ifi_type = dev->type;
891 ifm->ifi_index = dev->ifindex;
892 ifm->ifi_flags = dev_get_flags(dev);
893 ifm->ifi_change = change;
894
895 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
896 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
897 NLA_PUT_U8(skb, IFLA_OPERSTATE,
898 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
899 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
900 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
901 NLA_PUT_U32(skb, IFLA_GROUP, dev->group);
902
903 if (dev->ifindex != dev->iflink)
904 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
905
906 if (dev->master)
907 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
908
909 if (dev->qdisc)
910 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
911
912 if (dev->ifalias)
913 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
914
915 if (1) {
916 struct rtnl_link_ifmap map = {
917 .mem_start = dev->mem_start,
918 .mem_end = dev->mem_end,
919 .base_addr = dev->base_addr,
920 .irq = dev->irq,
921 .dma = dev->dma,
922 .port = dev->if_port,
923 };
924 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
925 }
926
927 if (dev->addr_len) {
928 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
929 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
930 }
931
932 attr = nla_reserve(skb, IFLA_STATS,
933 sizeof(struct rtnl_link_stats));
934 if (attr == NULL)
935 goto nla_put_failure;
936
937 stats = dev_get_stats(dev, &temp);
938 copy_rtnl_link_stats(nla_data(attr), stats);
939
940 attr = nla_reserve(skb, IFLA_STATS64,
941 sizeof(struct rtnl_link_stats64));
942 if (attr == NULL)
943 goto nla_put_failure;
944 copy_rtnl_link_stats64(nla_data(attr), stats);
945
946 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF))
947 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
948
949 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
950 && (ext_filter_mask & RTEXT_FILTER_VF)) {
951 int i;
952
953 struct nlattr *vfinfo, *vf;
954 int num_vfs = dev_num_vf(dev->dev.parent);
955
956 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
957 if (!vfinfo)
958 goto nla_put_failure;
959 for (i = 0; i < num_vfs; i++) {
960 struct ifla_vf_info ivi;
961 struct ifla_vf_mac vf_mac;
962 struct ifla_vf_vlan vf_vlan;
963 struct ifla_vf_tx_rate vf_tx_rate;
964 struct ifla_vf_spoofchk vf_spoofchk;
965
966 /*
967 * Not all SR-IOV capable drivers support the
968 * spoofcheck query. Preset to -1 so the user
969 * space tool can detect that the driver didn't
970 * report anything.
971 */
972 ivi.spoofchk = -1;
973 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
974 break;
975 vf_mac.vf =
976 vf_vlan.vf =
977 vf_tx_rate.vf =
978 vf_spoofchk.vf = ivi.vf;
979
980 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
981 vf_vlan.vlan = ivi.vlan;
982 vf_vlan.qos = ivi.qos;
983 vf_tx_rate.rate = ivi.tx_rate;
984 vf_spoofchk.setting = ivi.spoofchk;
985 vf = nla_nest_start(skb, IFLA_VF_INFO);
986 if (!vf) {
987 nla_nest_cancel(skb, vfinfo);
988 goto nla_put_failure;
989 }
990 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
991 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
992 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
993 &vf_tx_rate);
994 NLA_PUT(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
995 &vf_spoofchk);
996 nla_nest_end(skb, vf);
997 }
998 nla_nest_end(skb, vfinfo);
999 }
1000
1001 if (rtnl_port_fill(skb, dev))
1002 goto nla_put_failure;
1003
1004 if (dev->rtnl_link_ops) {
1005 if (rtnl_link_fill(skb, dev) < 0)
1006 goto nla_put_failure;
1007 }
1008
1009 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1010 goto nla_put_failure;
1011
1012 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1013 if (af_ops->fill_link_af) {
1014 struct nlattr *af;
1015 int err;
1016
1017 if (!(af = nla_nest_start(skb, af_ops->family)))
1018 goto nla_put_failure;
1019
1020 err = af_ops->fill_link_af(skb, dev);
1021
1022 /*
1023 * Caller may return ENODATA to indicate that there
1024 * was no data to be dumped. This is not an error, it
1025 * means we should trim the attribute header and
1026 * continue.
1027 */
1028 if (err == -ENODATA)
1029 nla_nest_cancel(skb, af);
1030 else if (err < 0)
1031 goto nla_put_failure;
1032
1033 nla_nest_end(skb, af);
1034 }
1035 }
1036
1037 nla_nest_end(skb, af_spec);
1038
1039 return nlmsg_end(skb, nlh);
1040
1041 nla_put_failure:
1042 nlmsg_cancel(skb, nlh);
1043 return -EMSGSIZE;
1044 }
1045
1046 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1047 {
1048 struct net *net = sock_net(skb->sk);
1049 int h, s_h;
1050 int idx = 0, s_idx;
1051 struct net_device *dev;
1052 struct hlist_head *head;
1053 struct hlist_node *node;
1054 struct nlattr *tb[IFLA_MAX+1];
1055 u32 ext_filter_mask = 0;
1056
1057 s_h = cb->args[0];
1058 s_idx = cb->args[1];
1059
1060 rcu_read_lock();
1061 cb->seq = net->dev_base_seq;
1062
1063 nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1064 ifla_policy);
1065
1066 if (tb[IFLA_EXT_MASK])
1067 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1068
1069 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1070 idx = 0;
1071 head = &net->dev_index_head[h];
1072 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1073 if (idx < s_idx)
1074 goto cont;
1075 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1076 NETLINK_CB(cb->skb).pid,
1077 cb->nlh->nlmsg_seq, 0,
1078 NLM_F_MULTI,
1079 ext_filter_mask) <= 0)
1080 goto out;
1081
1082 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1083 cont:
1084 idx++;
1085 }
1086 }
1087 out:
1088 rcu_read_unlock();
1089 cb->args[1] = idx;
1090 cb->args[0] = h;
1091
1092 return skb->len;
1093 }
1094
1095 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1096 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1097 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1098 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1099 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1100 [IFLA_MTU] = { .type = NLA_U32 },
1101 [IFLA_LINK] = { .type = NLA_U32 },
1102 [IFLA_MASTER] = { .type = NLA_U32 },
1103 [IFLA_TXQLEN] = { .type = NLA_U32 },
1104 [IFLA_WEIGHT] = { .type = NLA_U32 },
1105 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1106 [IFLA_LINKMODE] = { .type = NLA_U8 },
1107 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1108 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1109 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1110 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1111 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1112 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1113 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1114 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1115 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1116 };
1117 EXPORT_SYMBOL(ifla_policy);
1118
1119 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1120 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1121 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1122 };
1123
1124 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1125 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1126 };
1127
1128 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1129 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1130 .len = sizeof(struct ifla_vf_mac) },
1131 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1132 .len = sizeof(struct ifla_vf_vlan) },
1133 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1134 .len = sizeof(struct ifla_vf_tx_rate) },
1135 };
1136
1137 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1138 [IFLA_PORT_VF] = { .type = NLA_U32 },
1139 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1140 .len = PORT_PROFILE_MAX },
1141 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1142 .len = sizeof(struct ifla_port_vsi)},
1143 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1144 .len = PORT_UUID_MAX },
1145 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1146 .len = PORT_UUID_MAX },
1147 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1148 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1149 };
1150
1151 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1152 {
1153 struct net *net;
1154 /* Examine the link attributes and figure out which
1155 * network namespace we are talking about.
1156 */
1157 if (tb[IFLA_NET_NS_PID])
1158 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1159 else if (tb[IFLA_NET_NS_FD])
1160 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1161 else
1162 net = get_net(src_net);
1163 return net;
1164 }
1165 EXPORT_SYMBOL(rtnl_link_get_net);
1166
1167 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1168 {
1169 if (dev) {
1170 if (tb[IFLA_ADDRESS] &&
1171 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1172 return -EINVAL;
1173
1174 if (tb[IFLA_BROADCAST] &&
1175 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1176 return -EINVAL;
1177 }
1178
1179 if (tb[IFLA_AF_SPEC]) {
1180 struct nlattr *af;
1181 int rem, err;
1182
1183 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1184 const struct rtnl_af_ops *af_ops;
1185
1186 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1187 return -EAFNOSUPPORT;
1188
1189 if (!af_ops->set_link_af)
1190 return -EOPNOTSUPP;
1191
1192 if (af_ops->validate_link_af) {
1193 err = af_ops->validate_link_af(dev, af);
1194 if (err < 0)
1195 return err;
1196 }
1197 }
1198 }
1199
1200 return 0;
1201 }
1202
1203 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1204 {
1205 int rem, err = -EINVAL;
1206 struct nlattr *vf;
1207 const struct net_device_ops *ops = dev->netdev_ops;
1208
1209 nla_for_each_nested(vf, attr, rem) {
1210 switch (nla_type(vf)) {
1211 case IFLA_VF_MAC: {
1212 struct ifla_vf_mac *ivm;
1213 ivm = nla_data(vf);
1214 err = -EOPNOTSUPP;
1215 if (ops->ndo_set_vf_mac)
1216 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1217 ivm->mac);
1218 break;
1219 }
1220 case IFLA_VF_VLAN: {
1221 struct ifla_vf_vlan *ivv;
1222 ivv = nla_data(vf);
1223 err = -EOPNOTSUPP;
1224 if (ops->ndo_set_vf_vlan)
1225 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1226 ivv->vlan,
1227 ivv->qos);
1228 break;
1229 }
1230 case IFLA_VF_TX_RATE: {
1231 struct ifla_vf_tx_rate *ivt;
1232 ivt = nla_data(vf);
1233 err = -EOPNOTSUPP;
1234 if (ops->ndo_set_vf_tx_rate)
1235 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1236 ivt->rate);
1237 break;
1238 }
1239 case IFLA_VF_SPOOFCHK: {
1240 struct ifla_vf_spoofchk *ivs;
1241 ivs = nla_data(vf);
1242 err = -EOPNOTSUPP;
1243 if (ops->ndo_set_vf_spoofchk)
1244 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1245 ivs->setting);
1246 break;
1247 }
1248 default:
1249 err = -EINVAL;
1250 break;
1251 }
1252 if (err)
1253 break;
1254 }
1255 return err;
1256 }
1257
1258 static int do_set_master(struct net_device *dev, int ifindex)
1259 {
1260 struct net_device *master_dev;
1261 const struct net_device_ops *ops;
1262 int err;
1263
1264 if (dev->master) {
1265 if (dev->master->ifindex == ifindex)
1266 return 0;
1267 ops = dev->master->netdev_ops;
1268 if (ops->ndo_del_slave) {
1269 err = ops->ndo_del_slave(dev->master, dev);
1270 if (err)
1271 return err;
1272 } else {
1273 return -EOPNOTSUPP;
1274 }
1275 }
1276
1277 if (ifindex) {
1278 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1279 if (!master_dev)
1280 return -EINVAL;
1281 ops = master_dev->netdev_ops;
1282 if (ops->ndo_add_slave) {
1283 err = ops->ndo_add_slave(master_dev, dev);
1284 if (err)
1285 return err;
1286 } else {
1287 return -EOPNOTSUPP;
1288 }
1289 }
1290 return 0;
1291 }
1292
1293 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1294 struct nlattr **tb, char *ifname, int modified)
1295 {
1296 const struct net_device_ops *ops = dev->netdev_ops;
1297 int send_addr_notify = 0;
1298 int err;
1299
1300 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1301 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1302 if (IS_ERR(net)) {
1303 err = PTR_ERR(net);
1304 goto errout;
1305 }
1306 err = dev_change_net_namespace(dev, net, ifname);
1307 put_net(net);
1308 if (err)
1309 goto errout;
1310 modified = 1;
1311 }
1312
1313 if (tb[IFLA_MAP]) {
1314 struct rtnl_link_ifmap *u_map;
1315 struct ifmap k_map;
1316
1317 if (!ops->ndo_set_config) {
1318 err = -EOPNOTSUPP;
1319 goto errout;
1320 }
1321
1322 if (!netif_device_present(dev)) {
1323 err = -ENODEV;
1324 goto errout;
1325 }
1326
1327 u_map = nla_data(tb[IFLA_MAP]);
1328 k_map.mem_start = (unsigned long) u_map->mem_start;
1329 k_map.mem_end = (unsigned long) u_map->mem_end;
1330 k_map.base_addr = (unsigned short) u_map->base_addr;
1331 k_map.irq = (unsigned char) u_map->irq;
1332 k_map.dma = (unsigned char) u_map->dma;
1333 k_map.port = (unsigned char) u_map->port;
1334
1335 err = ops->ndo_set_config(dev, &k_map);
1336 if (err < 0)
1337 goto errout;
1338
1339 modified = 1;
1340 }
1341
1342 if (tb[IFLA_ADDRESS]) {
1343 struct sockaddr *sa;
1344 int len;
1345
1346 if (!ops->ndo_set_mac_address) {
1347 err = -EOPNOTSUPP;
1348 goto errout;
1349 }
1350
1351 if (!netif_device_present(dev)) {
1352 err = -ENODEV;
1353 goto errout;
1354 }
1355
1356 len = sizeof(sa_family_t) + dev->addr_len;
1357 sa = kmalloc(len, GFP_KERNEL);
1358 if (!sa) {
1359 err = -ENOMEM;
1360 goto errout;
1361 }
1362 sa->sa_family = dev->type;
1363 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1364 dev->addr_len);
1365 err = ops->ndo_set_mac_address(dev, sa);
1366 kfree(sa);
1367 if (err)
1368 goto errout;
1369 send_addr_notify = 1;
1370 modified = 1;
1371 }
1372
1373 if (tb[IFLA_MTU]) {
1374 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1375 if (err < 0)
1376 goto errout;
1377 modified = 1;
1378 }
1379
1380 if (tb[IFLA_GROUP]) {
1381 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1382 modified = 1;
1383 }
1384
1385 /*
1386 * Interface selected by interface index but interface
1387 * name provided implies that a name change has been
1388 * requested.
1389 */
1390 if (ifm->ifi_index > 0 && ifname[0]) {
1391 err = dev_change_name(dev, ifname);
1392 if (err < 0)
1393 goto errout;
1394 modified = 1;
1395 }
1396
1397 if (tb[IFLA_IFALIAS]) {
1398 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1399 nla_len(tb[IFLA_IFALIAS]));
1400 if (err < 0)
1401 goto errout;
1402 modified = 1;
1403 }
1404
1405 if (tb[IFLA_BROADCAST]) {
1406 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1407 send_addr_notify = 1;
1408 }
1409
1410 if (ifm->ifi_flags || ifm->ifi_change) {
1411 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1412 if (err < 0)
1413 goto errout;
1414 }
1415
1416 if (tb[IFLA_MASTER]) {
1417 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1418 if (err)
1419 goto errout;
1420 modified = 1;
1421 }
1422
1423 if (tb[IFLA_TXQLEN])
1424 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1425
1426 if (tb[IFLA_OPERSTATE])
1427 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1428
1429 if (tb[IFLA_LINKMODE]) {
1430 write_lock_bh(&dev_base_lock);
1431 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1432 write_unlock_bh(&dev_base_lock);
1433 }
1434
1435 if (tb[IFLA_VFINFO_LIST]) {
1436 struct nlattr *attr;
1437 int rem;
1438 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1439 if (nla_type(attr) != IFLA_VF_INFO) {
1440 err = -EINVAL;
1441 goto errout;
1442 }
1443 err = do_setvfinfo(dev, attr);
1444 if (err < 0)
1445 goto errout;
1446 modified = 1;
1447 }
1448 }
1449 err = 0;
1450
1451 if (tb[IFLA_VF_PORTS]) {
1452 struct nlattr *port[IFLA_PORT_MAX+1];
1453 struct nlattr *attr;
1454 int vf;
1455 int rem;
1456
1457 err = -EOPNOTSUPP;
1458 if (!ops->ndo_set_vf_port)
1459 goto errout;
1460
1461 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1462 if (nla_type(attr) != IFLA_VF_PORT)
1463 continue;
1464 err = nla_parse_nested(port, IFLA_PORT_MAX,
1465 attr, ifla_port_policy);
1466 if (err < 0)
1467 goto errout;
1468 if (!port[IFLA_PORT_VF]) {
1469 err = -EOPNOTSUPP;
1470 goto errout;
1471 }
1472 vf = nla_get_u32(port[IFLA_PORT_VF]);
1473 err = ops->ndo_set_vf_port(dev, vf, port);
1474 if (err < 0)
1475 goto errout;
1476 modified = 1;
1477 }
1478 }
1479 err = 0;
1480
1481 if (tb[IFLA_PORT_SELF]) {
1482 struct nlattr *port[IFLA_PORT_MAX+1];
1483
1484 err = nla_parse_nested(port, IFLA_PORT_MAX,
1485 tb[IFLA_PORT_SELF], ifla_port_policy);
1486 if (err < 0)
1487 goto errout;
1488
1489 err = -EOPNOTSUPP;
1490 if (ops->ndo_set_vf_port)
1491 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1492 if (err < 0)
1493 goto errout;
1494 modified = 1;
1495 }
1496
1497 if (tb[IFLA_AF_SPEC]) {
1498 struct nlattr *af;
1499 int rem;
1500
1501 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1502 const struct rtnl_af_ops *af_ops;
1503
1504 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1505 BUG();
1506
1507 err = af_ops->set_link_af(dev, af);
1508 if (err < 0)
1509 goto errout;
1510
1511 modified = 1;
1512 }
1513 }
1514 err = 0;
1515
1516 errout:
1517 if (err < 0 && modified && net_ratelimit())
1518 printk(KERN_WARNING "A link change request failed with "
1519 "some changes committed already. Interface %s may "
1520 "have been left with an inconsistent configuration, "
1521 "please check.\n", dev->name);
1522
1523 if (send_addr_notify)
1524 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1525
1526 return err;
1527 }
1528
1529 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1530 {
1531 struct net *net = sock_net(skb->sk);
1532 struct ifinfomsg *ifm;
1533 struct net_device *dev;
1534 int err;
1535 struct nlattr *tb[IFLA_MAX+1];
1536 char ifname[IFNAMSIZ];
1537
1538 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1539 if (err < 0)
1540 goto errout;
1541
1542 if (tb[IFLA_IFNAME])
1543 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1544 else
1545 ifname[0] = '\0';
1546
1547 err = -EINVAL;
1548 ifm = nlmsg_data(nlh);
1549 if (ifm->ifi_index > 0)
1550 dev = __dev_get_by_index(net, ifm->ifi_index);
1551 else if (tb[IFLA_IFNAME])
1552 dev = __dev_get_by_name(net, ifname);
1553 else
1554 goto errout;
1555
1556 if (dev == NULL) {
1557 err = -ENODEV;
1558 goto errout;
1559 }
1560
1561 err = validate_linkmsg(dev, tb);
1562 if (err < 0)
1563 goto errout;
1564
1565 err = do_setlink(dev, ifm, tb, ifname, 0);
1566 errout:
1567 return err;
1568 }
1569
1570 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1571 {
1572 struct net *net = sock_net(skb->sk);
1573 const struct rtnl_link_ops *ops;
1574 struct net_device *dev;
1575 struct ifinfomsg *ifm;
1576 char ifname[IFNAMSIZ];
1577 struct nlattr *tb[IFLA_MAX+1];
1578 int err;
1579 LIST_HEAD(list_kill);
1580
1581 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1582 if (err < 0)
1583 return err;
1584
1585 if (tb[IFLA_IFNAME])
1586 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1587
1588 ifm = nlmsg_data(nlh);
1589 if (ifm->ifi_index > 0)
1590 dev = __dev_get_by_index(net, ifm->ifi_index);
1591 else if (tb[IFLA_IFNAME])
1592 dev = __dev_get_by_name(net, ifname);
1593 else
1594 return -EINVAL;
1595
1596 if (!dev)
1597 return -ENODEV;
1598
1599 ops = dev->rtnl_link_ops;
1600 if (!ops)
1601 return -EOPNOTSUPP;
1602
1603 ops->dellink(dev, &list_kill);
1604 unregister_netdevice_many(&list_kill);
1605 list_del(&list_kill);
1606 return 0;
1607 }
1608
1609 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1610 {
1611 unsigned int old_flags;
1612 int err;
1613
1614 old_flags = dev->flags;
1615 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1616 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1617 if (err < 0)
1618 return err;
1619 }
1620
1621 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1622 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1623
1624 __dev_notify_flags(dev, old_flags);
1625 return 0;
1626 }
1627 EXPORT_SYMBOL(rtnl_configure_link);
1628
1629 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1630 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1631 {
1632 int err;
1633 struct net_device *dev;
1634 unsigned int num_queues = 1;
1635 unsigned int real_num_queues = 1;
1636
1637 if (ops->get_tx_queues) {
1638 err = ops->get_tx_queues(src_net, tb, &num_queues,
1639 &real_num_queues);
1640 if (err)
1641 goto err;
1642 }
1643 err = -ENOMEM;
1644 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1645 if (!dev)
1646 goto err;
1647
1648 dev_net_set(dev, net);
1649 dev->rtnl_link_ops = ops;
1650 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1651
1652 if (tb[IFLA_MTU])
1653 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1654 if (tb[IFLA_ADDRESS])
1655 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1656 nla_len(tb[IFLA_ADDRESS]));
1657 if (tb[IFLA_BROADCAST])
1658 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1659 nla_len(tb[IFLA_BROADCAST]));
1660 if (tb[IFLA_TXQLEN])
1661 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1662 if (tb[IFLA_OPERSTATE])
1663 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1664 if (tb[IFLA_LINKMODE])
1665 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1666 if (tb[IFLA_GROUP])
1667 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1668
1669 return dev;
1670
1671 err:
1672 return ERR_PTR(err);
1673 }
1674 EXPORT_SYMBOL(rtnl_create_link);
1675
1676 static int rtnl_group_changelink(struct net *net, int group,
1677 struct ifinfomsg *ifm,
1678 struct nlattr **tb)
1679 {
1680 struct net_device *dev;
1681 int err;
1682
1683 for_each_netdev(net, dev) {
1684 if (dev->group == group) {
1685 err = do_setlink(dev, ifm, tb, NULL, 0);
1686 if (err < 0)
1687 return err;
1688 }
1689 }
1690
1691 return 0;
1692 }
1693
1694 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1695 {
1696 struct net *net = sock_net(skb->sk);
1697 const struct rtnl_link_ops *ops;
1698 struct net_device *dev;
1699 struct ifinfomsg *ifm;
1700 char kind[MODULE_NAME_LEN];
1701 char ifname[IFNAMSIZ];
1702 struct nlattr *tb[IFLA_MAX+1];
1703 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1704 int err;
1705
1706 #ifdef CONFIG_MODULES
1707 replay:
1708 #endif
1709 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1710 if (err < 0)
1711 return err;
1712
1713 if (tb[IFLA_IFNAME])
1714 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1715 else
1716 ifname[0] = '\0';
1717
1718 ifm = nlmsg_data(nlh);
1719 if (ifm->ifi_index > 0)
1720 dev = __dev_get_by_index(net, ifm->ifi_index);
1721 else {
1722 if (ifname[0])
1723 dev = __dev_get_by_name(net, ifname);
1724 else
1725 dev = NULL;
1726 }
1727
1728 err = validate_linkmsg(dev, tb);
1729 if (err < 0)
1730 return err;
1731
1732 if (tb[IFLA_LINKINFO]) {
1733 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1734 tb[IFLA_LINKINFO], ifla_info_policy);
1735 if (err < 0)
1736 return err;
1737 } else
1738 memset(linkinfo, 0, sizeof(linkinfo));
1739
1740 if (linkinfo[IFLA_INFO_KIND]) {
1741 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1742 ops = rtnl_link_ops_get(kind);
1743 } else {
1744 kind[0] = '\0';
1745 ops = NULL;
1746 }
1747
1748 if (1) {
1749 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1750 struct net *dest_net;
1751
1752 if (ops) {
1753 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1754 err = nla_parse_nested(attr, ops->maxtype,
1755 linkinfo[IFLA_INFO_DATA],
1756 ops->policy);
1757 if (err < 0)
1758 return err;
1759 data = attr;
1760 }
1761 if (ops->validate) {
1762 err = ops->validate(tb, data);
1763 if (err < 0)
1764 return err;
1765 }
1766 }
1767
1768 if (dev) {
1769 int modified = 0;
1770
1771 if (nlh->nlmsg_flags & NLM_F_EXCL)
1772 return -EEXIST;
1773 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1774 return -EOPNOTSUPP;
1775
1776 if (linkinfo[IFLA_INFO_DATA]) {
1777 if (!ops || ops != dev->rtnl_link_ops ||
1778 !ops->changelink)
1779 return -EOPNOTSUPP;
1780
1781 err = ops->changelink(dev, tb, data);
1782 if (err < 0)
1783 return err;
1784 modified = 1;
1785 }
1786
1787 return do_setlink(dev, ifm, tb, ifname, modified);
1788 }
1789
1790 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1791 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1792 return rtnl_group_changelink(net,
1793 nla_get_u32(tb[IFLA_GROUP]),
1794 ifm, tb);
1795 return -ENODEV;
1796 }
1797
1798 if (ifm->ifi_index)
1799 return -EOPNOTSUPP;
1800 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1801 return -EOPNOTSUPP;
1802
1803 if (!ops) {
1804 #ifdef CONFIG_MODULES
1805 if (kind[0]) {
1806 __rtnl_unlock();
1807 request_module("rtnl-link-%s", kind);
1808 rtnl_lock();
1809 ops = rtnl_link_ops_get(kind);
1810 if (ops)
1811 goto replay;
1812 }
1813 #endif
1814 return -EOPNOTSUPP;
1815 }
1816
1817 if (!ifname[0])
1818 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1819
1820 dest_net = rtnl_link_get_net(net, tb);
1821 if (IS_ERR(dest_net))
1822 return PTR_ERR(dest_net);
1823
1824 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1825
1826 if (IS_ERR(dev))
1827 err = PTR_ERR(dev);
1828 else if (ops->newlink)
1829 err = ops->newlink(net, dev, tb, data);
1830 else
1831 err = register_netdevice(dev);
1832
1833 if (err < 0 && !IS_ERR(dev))
1834 free_netdev(dev);
1835 if (err < 0)
1836 goto out;
1837
1838 err = rtnl_configure_link(dev, ifm);
1839 if (err < 0)
1840 unregister_netdevice(dev);
1841 out:
1842 put_net(dest_net);
1843 return err;
1844 }
1845 }
1846
1847 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1848 {
1849 struct net *net = sock_net(skb->sk);
1850 struct ifinfomsg *ifm;
1851 char ifname[IFNAMSIZ];
1852 struct nlattr *tb[IFLA_MAX+1];
1853 struct net_device *dev = NULL;
1854 struct sk_buff *nskb;
1855 int err;
1856 u32 ext_filter_mask = 0;
1857
1858 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1859 if (err < 0)
1860 return err;
1861
1862 if (tb[IFLA_IFNAME])
1863 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1864
1865 if (tb[IFLA_EXT_MASK])
1866 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1867
1868 ifm = nlmsg_data(nlh);
1869 if (ifm->ifi_index > 0)
1870 dev = __dev_get_by_index(net, ifm->ifi_index);
1871 else if (tb[IFLA_IFNAME])
1872 dev = __dev_get_by_name(net, ifname);
1873 else
1874 return -EINVAL;
1875
1876 if (dev == NULL)
1877 return -ENODEV;
1878
1879 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1880 if (nskb == NULL)
1881 return -ENOBUFS;
1882
1883 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1884 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1885 if (err < 0) {
1886 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1887 WARN_ON(err == -EMSGSIZE);
1888 kfree_skb(nskb);
1889 } else
1890 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1891
1892 return err;
1893 }
1894
1895 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1896 {
1897 struct net *net = sock_net(skb->sk);
1898 struct net_device *dev;
1899 struct nlattr *tb[IFLA_MAX+1];
1900 u32 ext_filter_mask = 0;
1901 u16 min_ifinfo_dump_size = 0;
1902
1903 nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX, ifla_policy);
1904
1905 if (tb[IFLA_EXT_MASK])
1906 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1907
1908 if (!ext_filter_mask)
1909 return NLMSG_GOODSIZE;
1910 /*
1911 * traverse the list of net devices and compute the minimum
1912 * buffer size based upon the filter mask.
1913 */
1914 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1915 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1916 if_nlmsg_size(dev,
1917 ext_filter_mask));
1918 }
1919
1920 return min_ifinfo_dump_size;
1921 }
1922
1923 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1924 {
1925 int idx;
1926 int s_idx = cb->family;
1927
1928 if (s_idx == 0)
1929 s_idx = 1;
1930 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1931 int type = cb->nlh->nlmsg_type-RTM_BASE;
1932 if (idx < s_idx || idx == PF_PACKET)
1933 continue;
1934 if (rtnl_msg_handlers[idx] == NULL ||
1935 rtnl_msg_handlers[idx][type].dumpit == NULL)
1936 continue;
1937 if (idx > s_idx)
1938 memset(&cb->args[0], 0, sizeof(cb->args));
1939 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1940 break;
1941 }
1942 cb->family = idx;
1943
1944 return skb->len;
1945 }
1946
1947 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1948 {
1949 struct net *net = dev_net(dev);
1950 struct sk_buff *skb;
1951 int err = -ENOBUFS;
1952 size_t if_info_size;
1953
1954 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1955 if (skb == NULL)
1956 goto errout;
1957
1958 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
1959 if (err < 0) {
1960 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1961 WARN_ON(err == -EMSGSIZE);
1962 kfree_skb(skb);
1963 goto errout;
1964 }
1965 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1966 return;
1967 errout:
1968 if (err < 0)
1969 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1970 }
1971
1972 /* Protected by RTNL sempahore. */
1973 static struct rtattr **rta_buf;
1974 static int rtattr_max;
1975
1976 /* Process one rtnetlink message. */
1977
1978 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1979 {
1980 struct net *net = sock_net(skb->sk);
1981 rtnl_doit_func doit;
1982 int sz_idx, kind;
1983 int min_len;
1984 int family;
1985 int type;
1986 int err;
1987
1988 type = nlh->nlmsg_type;
1989 if (type > RTM_MAX)
1990 return -EOPNOTSUPP;
1991
1992 type -= RTM_BASE;
1993
1994 /* All the messages must have at least 1 byte length */
1995 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1996 return 0;
1997
1998 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1999 sz_idx = type>>2;
2000 kind = type&3;
2001
2002 if (kind != 2 && !capable(CAP_NET_ADMIN))
2003 return -EPERM;
2004
2005 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2006 struct sock *rtnl;
2007 rtnl_dumpit_func dumpit;
2008 rtnl_calcit_func calcit;
2009 u16 min_dump_alloc = 0;
2010
2011 dumpit = rtnl_get_dumpit(family, type);
2012 if (dumpit == NULL)
2013 return -EOPNOTSUPP;
2014 calcit = rtnl_get_calcit(family, type);
2015 if (calcit)
2016 min_dump_alloc = calcit(skb, nlh);
2017
2018 __rtnl_unlock();
2019 rtnl = net->rtnl;
2020 err = netlink_dump_start(rtnl, skb, nlh, dumpit,
2021 NULL, min_dump_alloc);
2022 rtnl_lock();
2023 return err;
2024 }
2025
2026 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
2027
2028 min_len = rtm_min[sz_idx];
2029 if (nlh->nlmsg_len < min_len)
2030 return -EINVAL;
2031
2032 if (nlh->nlmsg_len > min_len) {
2033 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
2034 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
2035
2036 while (RTA_OK(attr, attrlen)) {
2037 unsigned flavor = attr->rta_type;
2038 if (flavor) {
2039 if (flavor > rta_max[sz_idx])
2040 return -EINVAL;
2041 rta_buf[flavor-1] = attr;
2042 }
2043 attr = RTA_NEXT(attr, attrlen);
2044 }
2045 }
2046
2047 doit = rtnl_get_doit(family, type);
2048 if (doit == NULL)
2049 return -EOPNOTSUPP;
2050
2051 return doit(skb, nlh, (void *)&rta_buf[0]);
2052 }
2053
2054 static void rtnetlink_rcv(struct sk_buff *skb)
2055 {
2056 rtnl_lock();
2057 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2058 rtnl_unlock();
2059 }
2060
2061 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2062 {
2063 struct net_device *dev = ptr;
2064
2065 switch (event) {
2066 case NETDEV_UP:
2067 case NETDEV_DOWN:
2068 case NETDEV_PRE_UP:
2069 case NETDEV_POST_INIT:
2070 case NETDEV_REGISTER:
2071 case NETDEV_CHANGE:
2072 case NETDEV_PRE_TYPE_CHANGE:
2073 case NETDEV_GOING_DOWN:
2074 case NETDEV_UNREGISTER:
2075 case NETDEV_UNREGISTER_BATCH:
2076 case NETDEV_RELEASE:
2077 case NETDEV_JOIN:
2078 break;
2079 default:
2080 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2081 break;
2082 }
2083 return NOTIFY_DONE;
2084 }
2085
2086 static struct notifier_block rtnetlink_dev_notifier = {
2087 .notifier_call = rtnetlink_event,
2088 };
2089
2090
2091 static int __net_init rtnetlink_net_init(struct net *net)
2092 {
2093 struct sock *sk;
2094 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2095 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2096 if (!sk)
2097 return -ENOMEM;
2098 net->rtnl = sk;
2099 return 0;
2100 }
2101
2102 static void __net_exit rtnetlink_net_exit(struct net *net)
2103 {
2104 netlink_kernel_release(net->rtnl);
2105 net->rtnl = NULL;
2106 }
2107
2108 static struct pernet_operations rtnetlink_net_ops = {
2109 .init = rtnetlink_net_init,
2110 .exit = rtnetlink_net_exit,
2111 };
2112
2113 void __init rtnetlink_init(void)
2114 {
2115 int i;
2116
2117 rtattr_max = 0;
2118 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2119 if (rta_max[i] > rtattr_max)
2120 rtattr_max = rta_max[i];
2121 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2122 if (!rta_buf)
2123 panic("rtnetlink_init: cannot allocate rta_buf\n");
2124
2125 if (register_pernet_subsys(&rtnetlink_net_ops))
2126 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2127
2128 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2129 register_netdevice_notifier(&rtnetlink_dev_notifier);
2130
2131 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2132 rtnl_dump_ifinfo, rtnl_calcit);
2133 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2134 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2135 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2136
2137 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2138 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2139 }
2140
Linux kernel - Deliverables
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