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rtnetlink & bonding: change args got get_tx_queues
[mirror_ubuntu-bionic-kernel.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
42 #include <linux/inet.h>
43 #include <linux/netdevice.h>
44 #include <net/ip.h>
45 #include <net/protocol.h>
46 #include <net/arp.h>
47 #include <net/route.h>
48 #include <net/udp.h>
49 #include <net/sock.h>
50 #include <net/pkt_sched.h>
51 #include <net/fib_rules.h>
52 #include <net/rtnetlink.h>
53 #include <net/net_namespace.h>
54
55 struct rtnl_link {
56 rtnl_doit_func doit;
57 rtnl_dumpit_func dumpit;
58 rtnl_calcit_func calcit;
59 };
60
61 static DEFINE_MUTEX(rtnl_mutex);
62
63 void rtnl_lock(void)
64 {
65 mutex_lock(&rtnl_mutex);
66 }
67 EXPORT_SYMBOL(rtnl_lock);
68
69 void __rtnl_unlock(void)
70 {
71 mutex_unlock(&rtnl_mutex);
72 }
73
74 void rtnl_unlock(void)
75 {
76 /* This fellow will unlock it for us. */
77 netdev_run_todo();
78 }
79 EXPORT_SYMBOL(rtnl_unlock);
80
81 int rtnl_trylock(void)
82 {
83 return mutex_trylock(&rtnl_mutex);
84 }
85 EXPORT_SYMBOL(rtnl_trylock);
86
87 int rtnl_is_locked(void)
88 {
89 return mutex_is_locked(&rtnl_mutex);
90 }
91 EXPORT_SYMBOL(rtnl_is_locked);
92
93 #ifdef CONFIG_PROVE_LOCKING
94 int lockdep_rtnl_is_held(void)
95 {
96 return lockdep_is_held(&rtnl_mutex);
97 }
98 EXPORT_SYMBOL(lockdep_rtnl_is_held);
99 #endif /* #ifdef CONFIG_PROVE_LOCKING */
100
101 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
102
103 static inline int rtm_msgindex(int msgtype)
104 {
105 int msgindex = msgtype - RTM_BASE;
106
107 /*
108 * msgindex < 0 implies someone tried to register a netlink
109 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
110 * the message type has not been added to linux/rtnetlink.h
111 */
112 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
113
114 return msgindex;
115 }
116
117 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
118 {
119 struct rtnl_link *tab;
120
121 if (protocol <= RTNL_FAMILY_MAX)
122 tab = rtnl_msg_handlers[protocol];
123 else
124 tab = NULL;
125
126 if (tab == NULL || tab[msgindex].doit == NULL)
127 tab = rtnl_msg_handlers[PF_UNSPEC];
128
129 return tab ? tab[msgindex].doit : NULL;
130 }
131
132 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
133 {
134 struct rtnl_link *tab;
135
136 if (protocol <= RTNL_FAMILY_MAX)
137 tab = rtnl_msg_handlers[protocol];
138 else
139 tab = NULL;
140
141 if (tab == NULL || tab[msgindex].dumpit == NULL)
142 tab = rtnl_msg_handlers[PF_UNSPEC];
143
144 return tab ? tab[msgindex].dumpit : NULL;
145 }
146
147 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
148 {
149 struct rtnl_link *tab;
150
151 if (protocol <= RTNL_FAMILY_MAX)
152 tab = rtnl_msg_handlers[protocol];
153 else
154 tab = NULL;
155
156 if (tab == NULL || tab[msgindex].calcit == NULL)
157 tab = rtnl_msg_handlers[PF_UNSPEC];
158
159 return tab ? tab[msgindex].calcit : NULL;
160 }
161
162 /**
163 * __rtnl_register - Register a rtnetlink message type
164 * @protocol: Protocol family or PF_UNSPEC
165 * @msgtype: rtnetlink message type
166 * @doit: Function pointer called for each request message
167 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
168 * @calcit: Function pointer to calc size of dump message
169 *
170 * Registers the specified function pointers (at least one of them has
171 * to be non-NULL) to be called whenever a request message for the
172 * specified protocol family and message type is received.
173 *
174 * The special protocol family PF_UNSPEC may be used to define fallback
175 * function pointers for the case when no entry for the specific protocol
176 * family exists.
177 *
178 * Returns 0 on success or a negative error code.
179 */
180 int __rtnl_register(int protocol, int msgtype,
181 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
182 rtnl_calcit_func calcit)
183 {
184 struct rtnl_link *tab;
185 int msgindex;
186
187 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
188 msgindex = rtm_msgindex(msgtype);
189
190 tab = rtnl_msg_handlers[protocol];
191 if (tab == NULL) {
192 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
193 if (tab == NULL)
194 return -ENOBUFS;
195
196 rtnl_msg_handlers[protocol] = tab;
197 }
198
199 if (doit)
200 tab[msgindex].doit = doit;
201
202 if (dumpit)
203 tab[msgindex].dumpit = dumpit;
204
205 if (calcit)
206 tab[msgindex].calcit = calcit;
207
208 return 0;
209 }
210 EXPORT_SYMBOL_GPL(__rtnl_register);
211
212 /**
213 * rtnl_register - Register a rtnetlink message type
214 *
215 * Identical to __rtnl_register() but panics on failure. This is useful
216 * as failure of this function is very unlikely, it can only happen due
217 * to lack of memory when allocating the chain to store all message
218 * handlers for a protocol. Meant for use in init functions where lack
219 * of memory implies no sense in continuing.
220 */
221 void rtnl_register(int protocol, int msgtype,
222 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
223 rtnl_calcit_func calcit)
224 {
225 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
226 panic("Unable to register rtnetlink message handler, "
227 "protocol = %d, message type = %d\n",
228 protocol, msgtype);
229 }
230 EXPORT_SYMBOL_GPL(rtnl_register);
231
232 /**
233 * rtnl_unregister - Unregister a rtnetlink message type
234 * @protocol: Protocol family or PF_UNSPEC
235 * @msgtype: rtnetlink message type
236 *
237 * Returns 0 on success or a negative error code.
238 */
239 int rtnl_unregister(int protocol, int msgtype)
240 {
241 int msgindex;
242
243 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
244 msgindex = rtm_msgindex(msgtype);
245
246 if (rtnl_msg_handlers[protocol] == NULL)
247 return -ENOENT;
248
249 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
250 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
251
252 return 0;
253 }
254 EXPORT_SYMBOL_GPL(rtnl_unregister);
255
256 /**
257 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
258 * @protocol : Protocol family or PF_UNSPEC
259 *
260 * Identical to calling rtnl_unregster() for all registered message types
261 * of a certain protocol family.
262 */
263 void rtnl_unregister_all(int protocol)
264 {
265 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
266
267 kfree(rtnl_msg_handlers[protocol]);
268 rtnl_msg_handlers[protocol] = NULL;
269 }
270 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
271
272 static LIST_HEAD(link_ops);
273
274 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
275 {
276 const struct rtnl_link_ops *ops;
277
278 list_for_each_entry(ops, &link_ops, list) {
279 if (!strcmp(ops->kind, kind))
280 return ops;
281 }
282 return NULL;
283 }
284
285 /**
286 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
287 * @ops: struct rtnl_link_ops * to register
288 *
289 * The caller must hold the rtnl_mutex. This function should be used
290 * by drivers that create devices during module initialization. It
291 * must be called before registering the devices.
292 *
293 * Returns 0 on success or a negative error code.
294 */
295 int __rtnl_link_register(struct rtnl_link_ops *ops)
296 {
297 if (rtnl_link_ops_get(ops->kind))
298 return -EEXIST;
299
300 if (!ops->dellink)
301 ops->dellink = unregister_netdevice_queue;
302
303 list_add_tail(&ops->list, &link_ops);
304 return 0;
305 }
306 EXPORT_SYMBOL_GPL(__rtnl_link_register);
307
308 /**
309 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
310 * @ops: struct rtnl_link_ops * to register
311 *
312 * Returns 0 on success or a negative error code.
313 */
314 int rtnl_link_register(struct rtnl_link_ops *ops)
315 {
316 int err;
317
318 rtnl_lock();
319 err = __rtnl_link_register(ops);
320 rtnl_unlock();
321 return err;
322 }
323 EXPORT_SYMBOL_GPL(rtnl_link_register);
324
325 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
326 {
327 struct net_device *dev;
328 LIST_HEAD(list_kill);
329
330 for_each_netdev(net, dev) {
331 if (dev->rtnl_link_ops == ops)
332 ops->dellink(dev, &list_kill);
333 }
334 unregister_netdevice_many(&list_kill);
335 }
336
337 /**
338 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
339 * @ops: struct rtnl_link_ops * to unregister
340 *
341 * The caller must hold the rtnl_mutex.
342 */
343 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
344 {
345 struct net *net;
346
347 for_each_net(net) {
348 __rtnl_kill_links(net, ops);
349 }
350 list_del(&ops->list);
351 }
352 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
353
354 /**
355 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
356 * @ops: struct rtnl_link_ops * to unregister
357 */
358 void rtnl_link_unregister(struct rtnl_link_ops *ops)
359 {
360 rtnl_lock();
361 __rtnl_link_unregister(ops);
362 rtnl_unlock();
363 }
364 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
365
366 static size_t rtnl_link_get_size(const struct net_device *dev)
367 {
368 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
369 size_t size;
370
371 if (!ops)
372 return 0;
373
374 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
375 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
376
377 if (ops->get_size)
378 /* IFLA_INFO_DATA + nested data */
379 size += nla_total_size(sizeof(struct nlattr)) +
380 ops->get_size(dev);
381
382 if (ops->get_xstats_size)
383 /* IFLA_INFO_XSTATS */
384 size += nla_total_size(ops->get_xstats_size(dev));
385
386 return size;
387 }
388
389 static LIST_HEAD(rtnl_af_ops);
390
391 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
392 {
393 const struct rtnl_af_ops *ops;
394
395 list_for_each_entry(ops, &rtnl_af_ops, list) {
396 if (ops->family == family)
397 return ops;
398 }
399
400 return NULL;
401 }
402
403 /**
404 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
405 * @ops: struct rtnl_af_ops * to register
406 *
407 * The caller must hold the rtnl_mutex.
408 *
409 * Returns 0 on success or a negative error code.
410 */
411 int __rtnl_af_register(struct rtnl_af_ops *ops)
412 {
413 list_add_tail(&ops->list, &rtnl_af_ops);
414 return 0;
415 }
416 EXPORT_SYMBOL_GPL(__rtnl_af_register);
417
418 /**
419 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
420 * @ops: struct rtnl_af_ops * to register
421 *
422 * Returns 0 on success or a negative error code.
423 */
424 int rtnl_af_register(struct rtnl_af_ops *ops)
425 {
426 int err;
427
428 rtnl_lock();
429 err = __rtnl_af_register(ops);
430 rtnl_unlock();
431 return err;
432 }
433 EXPORT_SYMBOL_GPL(rtnl_af_register);
434
435 /**
436 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
437 * @ops: struct rtnl_af_ops * to unregister
438 *
439 * The caller must hold the rtnl_mutex.
440 */
441 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
442 {
443 list_del(&ops->list);
444 }
445 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
446
447 /**
448 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
449 * @ops: struct rtnl_af_ops * to unregister
450 */
451 void rtnl_af_unregister(struct rtnl_af_ops *ops)
452 {
453 rtnl_lock();
454 __rtnl_af_unregister(ops);
455 rtnl_unlock();
456 }
457 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
458
459 static size_t rtnl_link_get_af_size(const struct net_device *dev)
460 {
461 struct rtnl_af_ops *af_ops;
462 size_t size;
463
464 /* IFLA_AF_SPEC */
465 size = nla_total_size(sizeof(struct nlattr));
466
467 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
468 if (af_ops->get_link_af_size) {
469 /* AF_* + nested data */
470 size += nla_total_size(sizeof(struct nlattr)) +
471 af_ops->get_link_af_size(dev);
472 }
473 }
474
475 return size;
476 }
477
478 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
479 {
480 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
481 struct nlattr *linkinfo, *data;
482 int err = -EMSGSIZE;
483
484 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
485 if (linkinfo == NULL)
486 goto out;
487
488 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
489 goto err_cancel_link;
490 if (ops->fill_xstats) {
491 err = ops->fill_xstats(skb, dev);
492 if (err < 0)
493 goto err_cancel_link;
494 }
495 if (ops->fill_info) {
496 data = nla_nest_start(skb, IFLA_INFO_DATA);
497 if (data == NULL)
498 goto err_cancel_link;
499 err = ops->fill_info(skb, dev);
500 if (err < 0)
501 goto err_cancel_data;
502 nla_nest_end(skb, data);
503 }
504
505 nla_nest_end(skb, linkinfo);
506 return 0;
507
508 err_cancel_data:
509 nla_nest_cancel(skb, data);
510 err_cancel_link:
511 nla_nest_cancel(skb, linkinfo);
512 out:
513 return err;
514 }
515
516 static const int rtm_min[RTM_NR_FAMILIES] =
517 {
518 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
519 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
520 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
521 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
522 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
523 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
524 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
525 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
526 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
527 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
528 };
529
530 static const int rta_max[RTM_NR_FAMILIES] =
531 {
532 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
533 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
534 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
535 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
536 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
537 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
538 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
539 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
540 };
541
542 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
543 {
544 struct rtattr *rta;
545 int size = RTA_LENGTH(attrlen);
546
547 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
548 rta->rta_type = attrtype;
549 rta->rta_len = size;
550 memcpy(RTA_DATA(rta), data, attrlen);
551 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
552 }
553 EXPORT_SYMBOL(__rta_fill);
554
555 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
556 {
557 struct sock *rtnl = net->rtnl;
558 int err = 0;
559
560 NETLINK_CB(skb).dst_group = group;
561 if (echo)
562 atomic_inc(&skb->users);
563 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
564 if (echo)
565 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
566 return err;
567 }
568
569 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
570 {
571 struct sock *rtnl = net->rtnl;
572
573 return nlmsg_unicast(rtnl, skb, pid);
574 }
575 EXPORT_SYMBOL(rtnl_unicast);
576
577 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
578 struct nlmsghdr *nlh, gfp_t flags)
579 {
580 struct sock *rtnl = net->rtnl;
581 int report = 0;
582
583 if (nlh)
584 report = nlmsg_report(nlh);
585
586 nlmsg_notify(rtnl, skb, pid, group, report, flags);
587 }
588 EXPORT_SYMBOL(rtnl_notify);
589
590 void rtnl_set_sk_err(struct net *net, u32 group, int error)
591 {
592 struct sock *rtnl = net->rtnl;
593
594 netlink_set_err(rtnl, 0, group, error);
595 }
596 EXPORT_SYMBOL(rtnl_set_sk_err);
597
598 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
599 {
600 struct nlattr *mx;
601 int i, valid = 0;
602
603 mx = nla_nest_start(skb, RTA_METRICS);
604 if (mx == NULL)
605 return -ENOBUFS;
606
607 for (i = 0; i < RTAX_MAX; i++) {
608 if (metrics[i]) {
609 valid++;
610 if (nla_put_u32(skb, i+1, metrics[i]))
611 goto nla_put_failure;
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(4) /* IFLA_PROMISCUITY */
787 + nla_total_size(1) /* IFLA_OPERSTATE */
788 + nla_total_size(1) /* IFLA_LINKMODE */
789 + nla_total_size(ext_filter_mask
790 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
791 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
792 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
793 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
794 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
795 }
796
797 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
798 {
799 struct nlattr *vf_ports;
800 struct nlattr *vf_port;
801 int vf;
802 int err;
803
804 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
805 if (!vf_ports)
806 return -EMSGSIZE;
807
808 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
809 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
810 if (!vf_port)
811 goto nla_put_failure;
812 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
813 goto nla_put_failure;
814 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
815 if (err == -EMSGSIZE)
816 goto nla_put_failure;
817 if (err) {
818 nla_nest_cancel(skb, vf_port);
819 continue;
820 }
821 nla_nest_end(skb, vf_port);
822 }
823
824 nla_nest_end(skb, vf_ports);
825
826 return 0;
827
828 nla_put_failure:
829 nla_nest_cancel(skb, vf_ports);
830 return -EMSGSIZE;
831 }
832
833 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
834 {
835 struct nlattr *port_self;
836 int err;
837
838 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
839 if (!port_self)
840 return -EMSGSIZE;
841
842 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
843 if (err) {
844 nla_nest_cancel(skb, port_self);
845 return (err == -EMSGSIZE) ? err : 0;
846 }
847
848 nla_nest_end(skb, port_self);
849
850 return 0;
851 }
852
853 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
854 {
855 int err;
856
857 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
858 return 0;
859
860 err = rtnl_port_self_fill(skb, dev);
861 if (err)
862 return err;
863
864 if (dev_num_vf(dev->dev.parent)) {
865 err = rtnl_vf_ports_fill(skb, dev);
866 if (err)
867 return err;
868 }
869
870 return 0;
871 }
872
873 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
874 int type, u32 pid, u32 seq, u32 change,
875 unsigned int flags, u32 ext_filter_mask)
876 {
877 struct ifinfomsg *ifm;
878 struct nlmsghdr *nlh;
879 struct rtnl_link_stats64 temp;
880 const struct rtnl_link_stats64 *stats;
881 struct nlattr *attr, *af_spec;
882 struct rtnl_af_ops *af_ops;
883
884 ASSERT_RTNL();
885 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
886 if (nlh == NULL)
887 return -EMSGSIZE;
888
889 ifm = nlmsg_data(nlh);
890 ifm->ifi_family = AF_UNSPEC;
891 ifm->__ifi_pad = 0;
892 ifm->ifi_type = dev->type;
893 ifm->ifi_index = dev->ifindex;
894 ifm->ifi_flags = dev_get_flags(dev);
895 ifm->ifi_change = change;
896
897 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
898 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
899 nla_put_u8(skb, IFLA_OPERSTATE,
900 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
901 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
902 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
903 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
904 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
905 (dev->ifindex != dev->iflink &&
906 nla_put_u32(skb, IFLA_LINK, dev->iflink)) ||
907 (dev->master &&
908 nla_put_u32(skb, IFLA_MASTER, dev->master->ifindex)) ||
909 (dev->qdisc &&
910 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
911 (dev->ifalias &&
912 nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)))
913 goto nla_put_failure;
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 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
925 goto nla_put_failure;
926 }
927
928 if (dev->addr_len) {
929 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
930 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
931 goto nla_put_failure;
932 }
933
934 attr = nla_reserve(skb, IFLA_STATS,
935 sizeof(struct rtnl_link_stats));
936 if (attr == NULL)
937 goto nla_put_failure;
938
939 stats = dev_get_stats(dev, &temp);
940 copy_rtnl_link_stats(nla_data(attr), stats);
941
942 attr = nla_reserve(skb, IFLA_STATS64,
943 sizeof(struct rtnl_link_stats64));
944 if (attr == NULL)
945 goto nla_put_failure;
946 copy_rtnl_link_stats64(nla_data(attr), stats);
947
948 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
949 nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
950 goto nla_put_failure;
951
952 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
953 && (ext_filter_mask & RTEXT_FILTER_VF)) {
954 int i;
955
956 struct nlattr *vfinfo, *vf;
957 int num_vfs = dev_num_vf(dev->dev.parent);
958
959 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
960 if (!vfinfo)
961 goto nla_put_failure;
962 for (i = 0; i < num_vfs; i++) {
963 struct ifla_vf_info ivi;
964 struct ifla_vf_mac vf_mac;
965 struct ifla_vf_vlan vf_vlan;
966 struct ifla_vf_tx_rate vf_tx_rate;
967 struct ifla_vf_spoofchk vf_spoofchk;
968
969 /*
970 * Not all SR-IOV capable drivers support the
971 * spoofcheck query. Preset to -1 so the user
972 * space tool can detect that the driver didn't
973 * report anything.
974 */
975 ivi.spoofchk = -1;
976 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
977 break;
978 vf_mac.vf =
979 vf_vlan.vf =
980 vf_tx_rate.vf =
981 vf_spoofchk.vf = ivi.vf;
982
983 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
984 vf_vlan.vlan = ivi.vlan;
985 vf_vlan.qos = ivi.qos;
986 vf_tx_rate.rate = ivi.tx_rate;
987 vf_spoofchk.setting = ivi.spoofchk;
988 vf = nla_nest_start(skb, IFLA_VF_INFO);
989 if (!vf) {
990 nla_nest_cancel(skb, vfinfo);
991 goto nla_put_failure;
992 }
993 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
994 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
995 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
996 &vf_tx_rate) ||
997 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
998 &vf_spoofchk))
999 goto nla_put_failure;
1000 nla_nest_end(skb, vf);
1001 }
1002 nla_nest_end(skb, vfinfo);
1003 }
1004
1005 if (rtnl_port_fill(skb, dev))
1006 goto nla_put_failure;
1007
1008 if (dev->rtnl_link_ops) {
1009 if (rtnl_link_fill(skb, dev) < 0)
1010 goto nla_put_failure;
1011 }
1012
1013 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1014 goto nla_put_failure;
1015
1016 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1017 if (af_ops->fill_link_af) {
1018 struct nlattr *af;
1019 int err;
1020
1021 if (!(af = nla_nest_start(skb, af_ops->family)))
1022 goto nla_put_failure;
1023
1024 err = af_ops->fill_link_af(skb, dev);
1025
1026 /*
1027 * Caller may return ENODATA to indicate that there
1028 * was no data to be dumped. This is not an error, it
1029 * means we should trim the attribute header and
1030 * continue.
1031 */
1032 if (err == -ENODATA)
1033 nla_nest_cancel(skb, af);
1034 else if (err < 0)
1035 goto nla_put_failure;
1036
1037 nla_nest_end(skb, af);
1038 }
1039 }
1040
1041 nla_nest_end(skb, af_spec);
1042
1043 return nlmsg_end(skb, nlh);
1044
1045 nla_put_failure:
1046 nlmsg_cancel(skb, nlh);
1047 return -EMSGSIZE;
1048 }
1049
1050 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1051 {
1052 struct net *net = sock_net(skb->sk);
1053 int h, s_h;
1054 int idx = 0, s_idx;
1055 struct net_device *dev;
1056 struct hlist_head *head;
1057 struct hlist_node *node;
1058 struct nlattr *tb[IFLA_MAX+1];
1059 u32 ext_filter_mask = 0;
1060
1061 s_h = cb->args[0];
1062 s_idx = cb->args[1];
1063
1064 rcu_read_lock();
1065 cb->seq = net->dev_base_seq;
1066
1067 if (nlmsg_parse(cb->nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1068 ifla_policy) >= 0) {
1069
1070 if (tb[IFLA_EXT_MASK])
1071 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1072 }
1073
1074 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1075 idx = 0;
1076 head = &net->dev_index_head[h];
1077 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1078 if (idx < s_idx)
1079 goto cont;
1080 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1081 NETLINK_CB(cb->skb).pid,
1082 cb->nlh->nlmsg_seq, 0,
1083 NLM_F_MULTI,
1084 ext_filter_mask) <= 0)
1085 goto out;
1086
1087 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1088 cont:
1089 idx++;
1090 }
1091 }
1092 out:
1093 rcu_read_unlock();
1094 cb->args[1] = idx;
1095 cb->args[0] = h;
1096
1097 return skb->len;
1098 }
1099
1100 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1101 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1102 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1103 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1104 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1105 [IFLA_MTU] = { .type = NLA_U32 },
1106 [IFLA_LINK] = { .type = NLA_U32 },
1107 [IFLA_MASTER] = { .type = NLA_U32 },
1108 [IFLA_TXQLEN] = { .type = NLA_U32 },
1109 [IFLA_WEIGHT] = { .type = NLA_U32 },
1110 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1111 [IFLA_LINKMODE] = { .type = NLA_U8 },
1112 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1113 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1114 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1115 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1116 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1117 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1118 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1119 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1120 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1121 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1122 };
1123 EXPORT_SYMBOL(ifla_policy);
1124
1125 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1126 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1127 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1128 };
1129
1130 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1131 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1132 };
1133
1134 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1135 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1136 .len = sizeof(struct ifla_vf_mac) },
1137 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1138 .len = sizeof(struct ifla_vf_vlan) },
1139 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1140 .len = sizeof(struct ifla_vf_tx_rate) },
1141 [IFLA_VF_SPOOFCHK] = { .type = NLA_BINARY,
1142 .len = sizeof(struct ifla_vf_spoofchk) },
1143 };
1144
1145 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1146 [IFLA_PORT_VF] = { .type = NLA_U32 },
1147 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1148 .len = PORT_PROFILE_MAX },
1149 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1150 .len = sizeof(struct ifla_port_vsi)},
1151 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1152 .len = PORT_UUID_MAX },
1153 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1154 .len = PORT_UUID_MAX },
1155 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1156 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1157 };
1158
1159 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1160 {
1161 struct net *net;
1162 /* Examine the link attributes and figure out which
1163 * network namespace we are talking about.
1164 */
1165 if (tb[IFLA_NET_NS_PID])
1166 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1167 else if (tb[IFLA_NET_NS_FD])
1168 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1169 else
1170 net = get_net(src_net);
1171 return net;
1172 }
1173 EXPORT_SYMBOL(rtnl_link_get_net);
1174
1175 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1176 {
1177 if (dev) {
1178 if (tb[IFLA_ADDRESS] &&
1179 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1180 return -EINVAL;
1181
1182 if (tb[IFLA_BROADCAST] &&
1183 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1184 return -EINVAL;
1185 }
1186
1187 if (tb[IFLA_AF_SPEC]) {
1188 struct nlattr *af;
1189 int rem, err;
1190
1191 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1192 const struct rtnl_af_ops *af_ops;
1193
1194 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1195 return -EAFNOSUPPORT;
1196
1197 if (!af_ops->set_link_af)
1198 return -EOPNOTSUPP;
1199
1200 if (af_ops->validate_link_af) {
1201 err = af_ops->validate_link_af(dev, af);
1202 if (err < 0)
1203 return err;
1204 }
1205 }
1206 }
1207
1208 return 0;
1209 }
1210
1211 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1212 {
1213 int rem, err = -EINVAL;
1214 struct nlattr *vf;
1215 const struct net_device_ops *ops = dev->netdev_ops;
1216
1217 nla_for_each_nested(vf, attr, rem) {
1218 switch (nla_type(vf)) {
1219 case IFLA_VF_MAC: {
1220 struct ifla_vf_mac *ivm;
1221 ivm = nla_data(vf);
1222 err = -EOPNOTSUPP;
1223 if (ops->ndo_set_vf_mac)
1224 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1225 ivm->mac);
1226 break;
1227 }
1228 case IFLA_VF_VLAN: {
1229 struct ifla_vf_vlan *ivv;
1230 ivv = nla_data(vf);
1231 err = -EOPNOTSUPP;
1232 if (ops->ndo_set_vf_vlan)
1233 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1234 ivv->vlan,
1235 ivv->qos);
1236 break;
1237 }
1238 case IFLA_VF_TX_RATE: {
1239 struct ifla_vf_tx_rate *ivt;
1240 ivt = nla_data(vf);
1241 err = -EOPNOTSUPP;
1242 if (ops->ndo_set_vf_tx_rate)
1243 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1244 ivt->rate);
1245 break;
1246 }
1247 case IFLA_VF_SPOOFCHK: {
1248 struct ifla_vf_spoofchk *ivs;
1249 ivs = nla_data(vf);
1250 err = -EOPNOTSUPP;
1251 if (ops->ndo_set_vf_spoofchk)
1252 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1253 ivs->setting);
1254 break;
1255 }
1256 default:
1257 err = -EINVAL;
1258 break;
1259 }
1260 if (err)
1261 break;
1262 }
1263 return err;
1264 }
1265
1266 static int do_set_master(struct net_device *dev, int ifindex)
1267 {
1268 struct net_device *master_dev;
1269 const struct net_device_ops *ops;
1270 int err;
1271
1272 if (dev->master) {
1273 if (dev->master->ifindex == ifindex)
1274 return 0;
1275 ops = dev->master->netdev_ops;
1276 if (ops->ndo_del_slave) {
1277 err = ops->ndo_del_slave(dev->master, dev);
1278 if (err)
1279 return err;
1280 } else {
1281 return -EOPNOTSUPP;
1282 }
1283 }
1284
1285 if (ifindex) {
1286 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1287 if (!master_dev)
1288 return -EINVAL;
1289 ops = master_dev->netdev_ops;
1290 if (ops->ndo_add_slave) {
1291 err = ops->ndo_add_slave(master_dev, dev);
1292 if (err)
1293 return err;
1294 } else {
1295 return -EOPNOTSUPP;
1296 }
1297 }
1298 return 0;
1299 }
1300
1301 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1302 struct nlattr **tb, char *ifname, int modified)
1303 {
1304 const struct net_device_ops *ops = dev->netdev_ops;
1305 int send_addr_notify = 0;
1306 int err;
1307
1308 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1309 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1310 if (IS_ERR(net)) {
1311 err = PTR_ERR(net);
1312 goto errout;
1313 }
1314 err = dev_change_net_namespace(dev, net, ifname);
1315 put_net(net);
1316 if (err)
1317 goto errout;
1318 modified = 1;
1319 }
1320
1321 if (tb[IFLA_MAP]) {
1322 struct rtnl_link_ifmap *u_map;
1323 struct ifmap k_map;
1324
1325 if (!ops->ndo_set_config) {
1326 err = -EOPNOTSUPP;
1327 goto errout;
1328 }
1329
1330 if (!netif_device_present(dev)) {
1331 err = -ENODEV;
1332 goto errout;
1333 }
1334
1335 u_map = nla_data(tb[IFLA_MAP]);
1336 k_map.mem_start = (unsigned long) u_map->mem_start;
1337 k_map.mem_end = (unsigned long) u_map->mem_end;
1338 k_map.base_addr = (unsigned short) u_map->base_addr;
1339 k_map.irq = (unsigned char) u_map->irq;
1340 k_map.dma = (unsigned char) u_map->dma;
1341 k_map.port = (unsigned char) u_map->port;
1342
1343 err = ops->ndo_set_config(dev, &k_map);
1344 if (err < 0)
1345 goto errout;
1346
1347 modified = 1;
1348 }
1349
1350 if (tb[IFLA_ADDRESS]) {
1351 struct sockaddr *sa;
1352 int len;
1353
1354 if (!ops->ndo_set_mac_address) {
1355 err = -EOPNOTSUPP;
1356 goto errout;
1357 }
1358
1359 if (!netif_device_present(dev)) {
1360 err = -ENODEV;
1361 goto errout;
1362 }
1363
1364 len = sizeof(sa_family_t) + dev->addr_len;
1365 sa = kmalloc(len, GFP_KERNEL);
1366 if (!sa) {
1367 err = -ENOMEM;
1368 goto errout;
1369 }
1370 sa->sa_family = dev->type;
1371 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1372 dev->addr_len);
1373 err = ops->ndo_set_mac_address(dev, sa);
1374 kfree(sa);
1375 if (err)
1376 goto errout;
1377 send_addr_notify = 1;
1378 modified = 1;
1379 }
1380
1381 if (tb[IFLA_MTU]) {
1382 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1383 if (err < 0)
1384 goto errout;
1385 modified = 1;
1386 }
1387
1388 if (tb[IFLA_GROUP]) {
1389 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1390 modified = 1;
1391 }
1392
1393 /*
1394 * Interface selected by interface index but interface
1395 * name provided implies that a name change has been
1396 * requested.
1397 */
1398 if (ifm->ifi_index > 0 && ifname[0]) {
1399 err = dev_change_name(dev, ifname);
1400 if (err < 0)
1401 goto errout;
1402 modified = 1;
1403 }
1404
1405 if (tb[IFLA_IFALIAS]) {
1406 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1407 nla_len(tb[IFLA_IFALIAS]));
1408 if (err < 0)
1409 goto errout;
1410 modified = 1;
1411 }
1412
1413 if (tb[IFLA_BROADCAST]) {
1414 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1415 send_addr_notify = 1;
1416 }
1417
1418 if (ifm->ifi_flags || ifm->ifi_change) {
1419 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1420 if (err < 0)
1421 goto errout;
1422 }
1423
1424 if (tb[IFLA_MASTER]) {
1425 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1426 if (err)
1427 goto errout;
1428 modified = 1;
1429 }
1430
1431 if (tb[IFLA_TXQLEN])
1432 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1433
1434 if (tb[IFLA_OPERSTATE])
1435 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1436
1437 if (tb[IFLA_LINKMODE]) {
1438 write_lock_bh(&dev_base_lock);
1439 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1440 write_unlock_bh(&dev_base_lock);
1441 }
1442
1443 if (tb[IFLA_VFINFO_LIST]) {
1444 struct nlattr *attr;
1445 int rem;
1446 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1447 if (nla_type(attr) != IFLA_VF_INFO) {
1448 err = -EINVAL;
1449 goto errout;
1450 }
1451 err = do_setvfinfo(dev, attr);
1452 if (err < 0)
1453 goto errout;
1454 modified = 1;
1455 }
1456 }
1457 err = 0;
1458
1459 if (tb[IFLA_VF_PORTS]) {
1460 struct nlattr *port[IFLA_PORT_MAX+1];
1461 struct nlattr *attr;
1462 int vf;
1463 int rem;
1464
1465 err = -EOPNOTSUPP;
1466 if (!ops->ndo_set_vf_port)
1467 goto errout;
1468
1469 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1470 if (nla_type(attr) != IFLA_VF_PORT)
1471 continue;
1472 err = nla_parse_nested(port, IFLA_PORT_MAX,
1473 attr, ifla_port_policy);
1474 if (err < 0)
1475 goto errout;
1476 if (!port[IFLA_PORT_VF]) {
1477 err = -EOPNOTSUPP;
1478 goto errout;
1479 }
1480 vf = nla_get_u32(port[IFLA_PORT_VF]);
1481 err = ops->ndo_set_vf_port(dev, vf, port);
1482 if (err < 0)
1483 goto errout;
1484 modified = 1;
1485 }
1486 }
1487 err = 0;
1488
1489 if (tb[IFLA_PORT_SELF]) {
1490 struct nlattr *port[IFLA_PORT_MAX+1];
1491
1492 err = nla_parse_nested(port, IFLA_PORT_MAX,
1493 tb[IFLA_PORT_SELF], ifla_port_policy);
1494 if (err < 0)
1495 goto errout;
1496
1497 err = -EOPNOTSUPP;
1498 if (ops->ndo_set_vf_port)
1499 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1500 if (err < 0)
1501 goto errout;
1502 modified = 1;
1503 }
1504
1505 if (tb[IFLA_AF_SPEC]) {
1506 struct nlattr *af;
1507 int rem;
1508
1509 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1510 const struct rtnl_af_ops *af_ops;
1511
1512 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1513 BUG();
1514
1515 err = af_ops->set_link_af(dev, af);
1516 if (err < 0)
1517 goto errout;
1518
1519 modified = 1;
1520 }
1521 }
1522 err = 0;
1523
1524 errout:
1525 if (err < 0 && modified && net_ratelimit())
1526 printk(KERN_WARNING "A link change request failed with "
1527 "some changes committed already. Interface %s may "
1528 "have been left with an inconsistent configuration, "
1529 "please check.\n", dev->name);
1530
1531 if (send_addr_notify)
1532 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1533
1534 return err;
1535 }
1536
1537 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1538 {
1539 struct net *net = sock_net(skb->sk);
1540 struct ifinfomsg *ifm;
1541 struct net_device *dev;
1542 int err;
1543 struct nlattr *tb[IFLA_MAX+1];
1544 char ifname[IFNAMSIZ];
1545
1546 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1547 if (err < 0)
1548 goto errout;
1549
1550 if (tb[IFLA_IFNAME])
1551 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1552 else
1553 ifname[0] = '\0';
1554
1555 err = -EINVAL;
1556 ifm = nlmsg_data(nlh);
1557 if (ifm->ifi_index > 0)
1558 dev = __dev_get_by_index(net, ifm->ifi_index);
1559 else if (tb[IFLA_IFNAME])
1560 dev = __dev_get_by_name(net, ifname);
1561 else
1562 goto errout;
1563
1564 if (dev == NULL) {
1565 err = -ENODEV;
1566 goto errout;
1567 }
1568
1569 err = validate_linkmsg(dev, tb);
1570 if (err < 0)
1571 goto errout;
1572
1573 err = do_setlink(dev, ifm, tb, ifname, 0);
1574 errout:
1575 return err;
1576 }
1577
1578 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1579 {
1580 struct net *net = sock_net(skb->sk);
1581 const struct rtnl_link_ops *ops;
1582 struct net_device *dev;
1583 struct ifinfomsg *ifm;
1584 char ifname[IFNAMSIZ];
1585 struct nlattr *tb[IFLA_MAX+1];
1586 int err;
1587 LIST_HEAD(list_kill);
1588
1589 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1590 if (err < 0)
1591 return err;
1592
1593 if (tb[IFLA_IFNAME])
1594 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1595
1596 ifm = nlmsg_data(nlh);
1597 if (ifm->ifi_index > 0)
1598 dev = __dev_get_by_index(net, ifm->ifi_index);
1599 else if (tb[IFLA_IFNAME])
1600 dev = __dev_get_by_name(net, ifname);
1601 else
1602 return -EINVAL;
1603
1604 if (!dev)
1605 return -ENODEV;
1606
1607 ops = dev->rtnl_link_ops;
1608 if (!ops)
1609 return -EOPNOTSUPP;
1610
1611 ops->dellink(dev, &list_kill);
1612 unregister_netdevice_many(&list_kill);
1613 list_del(&list_kill);
1614 return 0;
1615 }
1616
1617 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1618 {
1619 unsigned int old_flags;
1620 int err;
1621
1622 old_flags = dev->flags;
1623 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1624 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1625 if (err < 0)
1626 return err;
1627 }
1628
1629 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1630 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1631
1632 __dev_notify_flags(dev, old_flags);
1633 return 0;
1634 }
1635 EXPORT_SYMBOL(rtnl_configure_link);
1636
1637 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1638 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1639 {
1640 int err;
1641 struct net_device *dev;
1642 unsigned int num_queues = 1;
1643
1644 if (ops->get_tx_queues) {
1645 err = ops->get_tx_queues(src_net, tb);
1646 if (err < 0)
1647 goto err;
1648 num_queues = err;
1649 }
1650
1651 err = -ENOMEM;
1652 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1653 if (!dev)
1654 goto err;
1655
1656 dev_net_set(dev, net);
1657 dev->rtnl_link_ops = ops;
1658 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1659
1660 if (tb[IFLA_MTU])
1661 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1662 if (tb[IFLA_ADDRESS])
1663 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1664 nla_len(tb[IFLA_ADDRESS]));
1665 if (tb[IFLA_BROADCAST])
1666 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1667 nla_len(tb[IFLA_BROADCAST]));
1668 if (tb[IFLA_TXQLEN])
1669 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1670 if (tb[IFLA_OPERSTATE])
1671 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1672 if (tb[IFLA_LINKMODE])
1673 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1674 if (tb[IFLA_GROUP])
1675 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1676
1677 return dev;
1678
1679 err:
1680 return ERR_PTR(err);
1681 }
1682 EXPORT_SYMBOL(rtnl_create_link);
1683
1684 static int rtnl_group_changelink(struct net *net, int group,
1685 struct ifinfomsg *ifm,
1686 struct nlattr **tb)
1687 {
1688 struct net_device *dev;
1689 int err;
1690
1691 for_each_netdev(net, dev) {
1692 if (dev->group == group) {
1693 err = do_setlink(dev, ifm, tb, NULL, 0);
1694 if (err < 0)
1695 return err;
1696 }
1697 }
1698
1699 return 0;
1700 }
1701
1702 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1703 {
1704 struct net *net = sock_net(skb->sk);
1705 const struct rtnl_link_ops *ops;
1706 struct net_device *dev;
1707 struct ifinfomsg *ifm;
1708 char kind[MODULE_NAME_LEN];
1709 char ifname[IFNAMSIZ];
1710 struct nlattr *tb[IFLA_MAX+1];
1711 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1712 int err;
1713
1714 #ifdef CONFIG_MODULES
1715 replay:
1716 #endif
1717 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1718 if (err < 0)
1719 return err;
1720
1721 if (tb[IFLA_IFNAME])
1722 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1723 else
1724 ifname[0] = '\0';
1725
1726 ifm = nlmsg_data(nlh);
1727 if (ifm->ifi_index > 0)
1728 dev = __dev_get_by_index(net, ifm->ifi_index);
1729 else {
1730 if (ifname[0])
1731 dev = __dev_get_by_name(net, ifname);
1732 else
1733 dev = NULL;
1734 }
1735
1736 err = validate_linkmsg(dev, tb);
1737 if (err < 0)
1738 return err;
1739
1740 if (tb[IFLA_LINKINFO]) {
1741 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1742 tb[IFLA_LINKINFO], ifla_info_policy);
1743 if (err < 0)
1744 return err;
1745 } else
1746 memset(linkinfo, 0, sizeof(linkinfo));
1747
1748 if (linkinfo[IFLA_INFO_KIND]) {
1749 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1750 ops = rtnl_link_ops_get(kind);
1751 } else {
1752 kind[0] = '\0';
1753 ops = NULL;
1754 }
1755
1756 if (1) {
1757 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1758 struct net *dest_net;
1759
1760 if (ops) {
1761 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1762 err = nla_parse_nested(attr, ops->maxtype,
1763 linkinfo[IFLA_INFO_DATA],
1764 ops->policy);
1765 if (err < 0)
1766 return err;
1767 data = attr;
1768 }
1769 if (ops->validate) {
1770 err = ops->validate(tb, data);
1771 if (err < 0)
1772 return err;
1773 }
1774 }
1775
1776 if (dev) {
1777 int modified = 0;
1778
1779 if (nlh->nlmsg_flags & NLM_F_EXCL)
1780 return -EEXIST;
1781 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1782 return -EOPNOTSUPP;
1783
1784 if (linkinfo[IFLA_INFO_DATA]) {
1785 if (!ops || ops != dev->rtnl_link_ops ||
1786 !ops->changelink)
1787 return -EOPNOTSUPP;
1788
1789 err = ops->changelink(dev, tb, data);
1790 if (err < 0)
1791 return err;
1792 modified = 1;
1793 }
1794
1795 return do_setlink(dev, ifm, tb, ifname, modified);
1796 }
1797
1798 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1799 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1800 return rtnl_group_changelink(net,
1801 nla_get_u32(tb[IFLA_GROUP]),
1802 ifm, tb);
1803 return -ENODEV;
1804 }
1805
1806 if (ifm->ifi_index)
1807 return -EOPNOTSUPP;
1808 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1809 return -EOPNOTSUPP;
1810
1811 if (!ops) {
1812 #ifdef CONFIG_MODULES
1813 if (kind[0]) {
1814 __rtnl_unlock();
1815 request_module("rtnl-link-%s", kind);
1816 rtnl_lock();
1817 ops = rtnl_link_ops_get(kind);
1818 if (ops)
1819 goto replay;
1820 }
1821 #endif
1822 return -EOPNOTSUPP;
1823 }
1824
1825 if (!ifname[0])
1826 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1827
1828 dest_net = rtnl_link_get_net(net, tb);
1829 if (IS_ERR(dest_net))
1830 return PTR_ERR(dest_net);
1831
1832 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1833
1834 if (IS_ERR(dev))
1835 err = PTR_ERR(dev);
1836 else if (ops->newlink)
1837 err = ops->newlink(net, dev, tb, data);
1838 else
1839 err = register_netdevice(dev);
1840
1841 if (err < 0 && !IS_ERR(dev))
1842 free_netdev(dev);
1843 if (err < 0)
1844 goto out;
1845
1846 err = rtnl_configure_link(dev, ifm);
1847 if (err < 0)
1848 unregister_netdevice(dev);
1849 out:
1850 put_net(dest_net);
1851 return err;
1852 }
1853 }
1854
1855 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1856 {
1857 struct net *net = sock_net(skb->sk);
1858 struct ifinfomsg *ifm;
1859 char ifname[IFNAMSIZ];
1860 struct nlattr *tb[IFLA_MAX+1];
1861 struct net_device *dev = NULL;
1862 struct sk_buff *nskb;
1863 int err;
1864 u32 ext_filter_mask = 0;
1865
1866 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1867 if (err < 0)
1868 return err;
1869
1870 if (tb[IFLA_IFNAME])
1871 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1872
1873 if (tb[IFLA_EXT_MASK])
1874 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1875
1876 ifm = nlmsg_data(nlh);
1877 if (ifm->ifi_index > 0)
1878 dev = __dev_get_by_index(net, ifm->ifi_index);
1879 else if (tb[IFLA_IFNAME])
1880 dev = __dev_get_by_name(net, ifname);
1881 else
1882 return -EINVAL;
1883
1884 if (dev == NULL)
1885 return -ENODEV;
1886
1887 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
1888 if (nskb == NULL)
1889 return -ENOBUFS;
1890
1891 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1892 nlh->nlmsg_seq, 0, 0, ext_filter_mask);
1893 if (err < 0) {
1894 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1895 WARN_ON(err == -EMSGSIZE);
1896 kfree_skb(nskb);
1897 } else
1898 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1899
1900 return err;
1901 }
1902
1903 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
1904 {
1905 struct net *net = sock_net(skb->sk);
1906 struct net_device *dev;
1907 struct nlattr *tb[IFLA_MAX+1];
1908 u32 ext_filter_mask = 0;
1909 u16 min_ifinfo_dump_size = 0;
1910
1911 if (nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, IFLA_MAX,
1912 ifla_policy) >= 0) {
1913 if (tb[IFLA_EXT_MASK])
1914 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1915 }
1916
1917 if (!ext_filter_mask)
1918 return NLMSG_GOODSIZE;
1919 /*
1920 * traverse the list of net devices and compute the minimum
1921 * buffer size based upon the filter mask.
1922 */
1923 list_for_each_entry(dev, &net->dev_base_head, dev_list) {
1924 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
1925 if_nlmsg_size(dev,
1926 ext_filter_mask));
1927 }
1928
1929 return min_ifinfo_dump_size;
1930 }
1931
1932 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1933 {
1934 int idx;
1935 int s_idx = cb->family;
1936
1937 if (s_idx == 0)
1938 s_idx = 1;
1939 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1940 int type = cb->nlh->nlmsg_type-RTM_BASE;
1941 if (idx < s_idx || idx == PF_PACKET)
1942 continue;
1943 if (rtnl_msg_handlers[idx] == NULL ||
1944 rtnl_msg_handlers[idx][type].dumpit == NULL)
1945 continue;
1946 if (idx > s_idx)
1947 memset(&cb->args[0], 0, sizeof(cb->args));
1948 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1949 break;
1950 }
1951 cb->family = idx;
1952
1953 return skb->len;
1954 }
1955
1956 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1957 {
1958 struct net *net = dev_net(dev);
1959 struct sk_buff *skb;
1960 int err = -ENOBUFS;
1961 size_t if_info_size;
1962
1963 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), GFP_KERNEL);
1964 if (skb == NULL)
1965 goto errout;
1966
1967 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
1968 if (err < 0) {
1969 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1970 WARN_ON(err == -EMSGSIZE);
1971 kfree_skb(skb);
1972 goto errout;
1973 }
1974 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1975 return;
1976 errout:
1977 if (err < 0)
1978 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1979 }
1980
1981 /* Protected by RTNL sempahore. */
1982 static struct rtattr **rta_buf;
1983 static int rtattr_max;
1984
1985 /* Process one rtnetlink message. */
1986
1987 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1988 {
1989 struct net *net = sock_net(skb->sk);
1990 rtnl_doit_func doit;
1991 int sz_idx, kind;
1992 int min_len;
1993 int family;
1994 int type;
1995 int err;
1996
1997 type = nlh->nlmsg_type;
1998 if (type > RTM_MAX)
1999 return -EOPNOTSUPP;
2000
2001 type -= RTM_BASE;
2002
2003 /* All the messages must have at least 1 byte length */
2004 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
2005 return 0;
2006
2007 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
2008 sz_idx = type>>2;
2009 kind = type&3;
2010
2011 if (kind != 2 && !capable(CAP_NET_ADMIN))
2012 return -EPERM;
2013
2014 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
2015 struct sock *rtnl;
2016 rtnl_dumpit_func dumpit;
2017 rtnl_calcit_func calcit;
2018 u16 min_dump_alloc = 0;
2019
2020 dumpit = rtnl_get_dumpit(family, type);
2021 if (dumpit == NULL)
2022 return -EOPNOTSUPP;
2023 calcit = rtnl_get_calcit(family, type);
2024 if (calcit)
2025 min_dump_alloc = calcit(skb, nlh);
2026
2027 __rtnl_unlock();
2028 rtnl = net->rtnl;
2029 {
2030 struct netlink_dump_control c = {
2031 .dump = dumpit,
2032 .min_dump_alloc = min_dump_alloc,
2033 };
2034 err = netlink_dump_start(rtnl, skb, nlh, &c);
2035 }
2036 rtnl_lock();
2037 return err;
2038 }
2039
2040 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
2041
2042 min_len = rtm_min[sz_idx];
2043 if (nlh->nlmsg_len < min_len)
2044 return -EINVAL;
2045
2046 if (nlh->nlmsg_len > min_len) {
2047 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
2048 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
2049
2050 while (RTA_OK(attr, attrlen)) {
2051 unsigned flavor = attr->rta_type;
2052 if (flavor) {
2053 if (flavor > rta_max[sz_idx])
2054 return -EINVAL;
2055 rta_buf[flavor-1] = attr;
2056 }
2057 attr = RTA_NEXT(attr, attrlen);
2058 }
2059 }
2060
2061 doit = rtnl_get_doit(family, type);
2062 if (doit == NULL)
2063 return -EOPNOTSUPP;
2064
2065 return doit(skb, nlh, (void *)&rta_buf[0]);
2066 }
2067
2068 static void rtnetlink_rcv(struct sk_buff *skb)
2069 {
2070 rtnl_lock();
2071 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
2072 rtnl_unlock();
2073 }
2074
2075 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
2076 {
2077 struct net_device *dev = ptr;
2078
2079 switch (event) {
2080 case NETDEV_UP:
2081 case NETDEV_DOWN:
2082 case NETDEV_PRE_UP:
2083 case NETDEV_POST_INIT:
2084 case NETDEV_REGISTER:
2085 case NETDEV_CHANGE:
2086 case NETDEV_PRE_TYPE_CHANGE:
2087 case NETDEV_GOING_DOWN:
2088 case NETDEV_UNREGISTER:
2089 case NETDEV_UNREGISTER_BATCH:
2090 case NETDEV_RELEASE:
2091 case NETDEV_JOIN:
2092 break;
2093 default:
2094 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2095 break;
2096 }
2097 return NOTIFY_DONE;
2098 }
2099
2100 static struct notifier_block rtnetlink_dev_notifier = {
2101 .notifier_call = rtnetlink_event,
2102 };
2103
2104
2105 static int __net_init rtnetlink_net_init(struct net *net)
2106 {
2107 struct sock *sk;
2108 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2109 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2110 if (!sk)
2111 return -ENOMEM;
2112 net->rtnl = sk;
2113 return 0;
2114 }
2115
2116 static void __net_exit rtnetlink_net_exit(struct net *net)
2117 {
2118 netlink_kernel_release(net->rtnl);
2119 net->rtnl = NULL;
2120 }
2121
2122 static struct pernet_operations rtnetlink_net_ops = {
2123 .init = rtnetlink_net_init,
2124 .exit = rtnetlink_net_exit,
2125 };
2126
2127 void __init rtnetlink_init(void)
2128 {
2129 int i;
2130
2131 rtattr_max = 0;
2132 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2133 if (rta_max[i] > rtattr_max)
2134 rtattr_max = rta_max[i];
2135 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2136 if (!rta_buf)
2137 panic("rtnetlink_init: cannot allocate rta_buf\n");
2138
2139 if (register_pernet_subsys(&rtnetlink_net_ops))
2140 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2141
2142 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2143 register_netdevice_notifier(&rtnetlink_dev_notifier);
2144
2145 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2146 rtnl_dump_ifinfo, rtnl_calcit);
2147 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2148 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2149 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2150
2151 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2152 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2153 }
2154
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