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Merge 3.1-rc1 into usb-linus
[zen-stable.git] / net / core / rtnetlink.c
blob99d9e953fe3953adf96cc44cf85be380b6b3ff55
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 static u16 min_ifinfo_dump_size;
64
65 void rtnl_lock(void)
66 {
67 mutex_lock(&rtnl_mutex);
68 }
69 EXPORT_SYMBOL(rtnl_lock);
70
71 void __rtnl_unlock(void)
72 {
73 mutex_unlock(&rtnl_mutex);
74 }
75
76 void rtnl_unlock(void)
77 {
78 /* This fellow will unlock it for us. */
79 netdev_run_todo();
80 }
81 EXPORT_SYMBOL(rtnl_unlock);
82
83 int rtnl_trylock(void)
84 {
85 return mutex_trylock(&rtnl_mutex);
86 }
87 EXPORT_SYMBOL(rtnl_trylock);
88
89 int rtnl_is_locked(void)
90 {
91 return mutex_is_locked(&rtnl_mutex);
92 }
93 EXPORT_SYMBOL(rtnl_is_locked);
94
95 #ifdef CONFIG_PROVE_LOCKING
96 int lockdep_rtnl_is_held(void)
97 {
98 return lockdep_is_held(&rtnl_mutex);
99 }
100 EXPORT_SYMBOL(lockdep_rtnl_is_held);
101 #endif /* #ifdef CONFIG_PROVE_LOCKING */
102
103 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
104
105 static inline int rtm_msgindex(int msgtype)
106 {
107 int msgindex = msgtype - RTM_BASE;
108
109 /*
110 * msgindex < 0 implies someone tried to register a netlink
111 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
112 * the message type has not been added to linux/rtnetlink.h
113 */
114 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
115
116 return msgindex;
117 }
118
119 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
120 {
121 struct rtnl_link *tab;
122
123 if (protocol <= RTNL_FAMILY_MAX)
124 tab = rtnl_msg_handlers[protocol];
125 else
126 tab = NULL;
127
128 if (tab == NULL || tab[msgindex].doit == NULL)
129 tab = rtnl_msg_handlers[PF_UNSPEC];
130
131 return tab ? tab[msgindex].doit : NULL;
132 }
133
134 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
135 {
136 struct rtnl_link *tab;
137
138 if (protocol <= RTNL_FAMILY_MAX)
139 tab = rtnl_msg_handlers[protocol];
140 else
141 tab = NULL;
142
143 if (tab == NULL || tab[msgindex].dumpit == NULL)
144 tab = rtnl_msg_handlers[PF_UNSPEC];
145
146 return tab ? tab[msgindex].dumpit : NULL;
147 }
148
149 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
150 {
151 struct rtnl_link *tab;
152
153 if (protocol <= RTNL_FAMILY_MAX)
154 tab = rtnl_msg_handlers[protocol];
155 else
156 tab = NULL;
157
158 if (tab == NULL || tab[msgindex].calcit == NULL)
159 tab = rtnl_msg_handlers[PF_UNSPEC];
160
161 return tab ? tab[msgindex].calcit : NULL;
162 }
163
164 /**
165 * __rtnl_register - Register a rtnetlink message type
166 * @protocol: Protocol family or PF_UNSPEC
167 * @msgtype: rtnetlink message type
168 * @doit: Function pointer called for each request message
169 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
170 * @calcit: Function pointer to calc size of dump message
171 *
172 * Registers the specified function pointers (at least one of them has
173 * to be non-NULL) to be called whenever a request message for the
174 * specified protocol family and message type is received.
175 *
176 * The special protocol family PF_UNSPEC may be used to define fallback
177 * function pointers for the case when no entry for the specific protocol
178 * family exists.
179 *
180 * Returns 0 on success or a negative error code.
181 */
182 int __rtnl_register(int protocol, int msgtype,
183 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
184 rtnl_calcit_func calcit)
185 {
186 struct rtnl_link *tab;
187 int msgindex;
188
189 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
190 msgindex = rtm_msgindex(msgtype);
191
192 tab = rtnl_msg_handlers[protocol];
193 if (tab == NULL) {
194 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
195 if (tab == NULL)
196 return -ENOBUFS;
197
198 rtnl_msg_handlers[protocol] = tab;
199 }
200
201 if (doit)
202 tab[msgindex].doit = doit;
203
204 if (dumpit)
205 tab[msgindex].dumpit = dumpit;
206
207 if (calcit)
208 tab[msgindex].calcit = calcit;
209
210 return 0;
211 }
212 EXPORT_SYMBOL_GPL(__rtnl_register);
213
214 /**
215 * rtnl_register - Register a rtnetlink message type
216 *
217 * Identical to __rtnl_register() but panics on failure. This is useful
218 * as failure of this function is very unlikely, it can only happen due
219 * to lack of memory when allocating the chain to store all message
220 * handlers for a protocol. Meant for use in init functions where lack
221 * of memory implies no sense in continuing.
222 */
223 void rtnl_register(int protocol, int msgtype,
224 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
225 rtnl_calcit_func calcit)
226 {
227 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
228 panic("Unable to register rtnetlink message handler, "
229 "protocol = %d, message type = %d\n",
230 protocol, msgtype);
231 }
232 EXPORT_SYMBOL_GPL(rtnl_register);
233
234 /**
235 * rtnl_unregister - Unregister a rtnetlink message type
236 * @protocol: Protocol family or PF_UNSPEC
237 * @msgtype: rtnetlink message type
238 *
239 * Returns 0 on success or a negative error code.
240 */
241 int rtnl_unregister(int protocol, int msgtype)
242 {
243 int msgindex;
244
245 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
246 msgindex = rtm_msgindex(msgtype);
247
248 if (rtnl_msg_handlers[protocol] == NULL)
249 return -ENOENT;
250
251 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
252 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
253
254 return 0;
255 }
256 EXPORT_SYMBOL_GPL(rtnl_unregister);
257
258 /**
259 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
260 * @protocol : Protocol family or PF_UNSPEC
261 *
262 * Identical to calling rtnl_unregster() for all registered message types
263 * of a certain protocol family.
264 */
265 void rtnl_unregister_all(int protocol)
266 {
267 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
268
269 kfree(rtnl_msg_handlers[protocol]);
270 rtnl_msg_handlers[protocol] = NULL;
271 }
272 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
273
274 static LIST_HEAD(link_ops);
275
276 /**
277 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
278 * @ops: struct rtnl_link_ops * to register
279 *
280 * The caller must hold the rtnl_mutex. This function should be used
281 * by drivers that create devices during module initialization. It
282 * must be called before registering the devices.
283 *
284 * Returns 0 on success or a negative error code.
285 */
286 int __rtnl_link_register(struct rtnl_link_ops *ops)
287 {
288 if (!ops->dellink)
289 ops->dellink = unregister_netdevice_queue;
290
291 list_add_tail(&ops->list, &link_ops);
292 return 0;
293 }
294 EXPORT_SYMBOL_GPL(__rtnl_link_register);
295
296 /**
297 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
298 * @ops: struct rtnl_link_ops * to register
299 *
300 * Returns 0 on success or a negative error code.
301 */
302 int rtnl_link_register(struct rtnl_link_ops *ops)
303 {
304 int err;
305
306 rtnl_lock();
307 err = __rtnl_link_register(ops);
308 rtnl_unlock();
309 return err;
310 }
311 EXPORT_SYMBOL_GPL(rtnl_link_register);
312
313 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
314 {
315 struct net_device *dev;
316 LIST_HEAD(list_kill);
317
318 for_each_netdev(net, dev) {
319 if (dev->rtnl_link_ops == ops)
320 ops->dellink(dev, &list_kill);
321 }
322 unregister_netdevice_many(&list_kill);
323 }
324
325 /**
326 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
327 * @ops: struct rtnl_link_ops * to unregister
328 *
329 * The caller must hold the rtnl_mutex.
330 */
331 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
332 {
333 struct net *net;
334
335 for_each_net(net) {
336 __rtnl_kill_links(net, ops);
337 }
338 list_del(&ops->list);
339 }
340 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
341
342 /**
343 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
344 * @ops: struct rtnl_link_ops * to unregister
345 */
346 void rtnl_link_unregister(struct rtnl_link_ops *ops)
347 {
348 rtnl_lock();
349 __rtnl_link_unregister(ops);
350 rtnl_unlock();
351 }
352 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
353
354 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
355 {
356 const struct rtnl_link_ops *ops;
357
358 list_for_each_entry(ops, &link_ops, list) {
359 if (!strcmp(ops->kind, kind))
360 return ops;
361 }
362 return NULL;
363 }
364
365 static size_t rtnl_link_get_size(const struct net_device *dev)
366 {
367 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
368 size_t size;
369
370 if (!ops)
371 return 0;
372
373 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
374 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
375
376 if (ops->get_size)
377 /* IFLA_INFO_DATA + nested data */
378 size += nla_total_size(sizeof(struct nlattr)) +
379 ops->get_size(dev);
380
381 if (ops->get_xstats_size)
382 /* IFLA_INFO_XSTATS */
383 size += nla_total_size(ops->get_xstats_size(dev));
384
385 return size;
386 }
387
388 static LIST_HEAD(rtnl_af_ops);
389
390 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
391 {
392 const struct rtnl_af_ops *ops;
393
394 list_for_each_entry(ops, &rtnl_af_ops, list) {
395 if (ops->family == family)
396 return ops;
397 }
398
399 return NULL;
400 }
401
402 /**
403 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
404 * @ops: struct rtnl_af_ops * to register
405 *
406 * The caller must hold the rtnl_mutex.
407 *
408 * Returns 0 on success or a negative error code.
409 */
410 int __rtnl_af_register(struct rtnl_af_ops *ops)
411 {
412 list_add_tail(&ops->list, &rtnl_af_ops);
413 return 0;
414 }
415 EXPORT_SYMBOL_GPL(__rtnl_af_register);
416
417 /**
418 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
419 * @ops: struct rtnl_af_ops * to register
420 *
421 * Returns 0 on success or a negative error code.
422 */
423 int rtnl_af_register(struct rtnl_af_ops *ops)
424 {
425 int err;
426
427 rtnl_lock();
428 err = __rtnl_af_register(ops);
429 rtnl_unlock();
430 return err;
431 }
432 EXPORT_SYMBOL_GPL(rtnl_af_register);
433
434 /**
435 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
436 * @ops: struct rtnl_af_ops * to unregister
437 *
438 * The caller must hold the rtnl_mutex.
439 */
440 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
441 {
442 list_del(&ops->list);
443 }
444 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
445
446 /**
447 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
448 * @ops: struct rtnl_af_ops * to unregister
449 */
450 void rtnl_af_unregister(struct rtnl_af_ops *ops)
451 {
452 rtnl_lock();
453 __rtnl_af_unregister(ops);
454 rtnl_unlock();
455 }
456 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
457
458 static size_t rtnl_link_get_af_size(const struct net_device *dev)
459 {
460 struct rtnl_af_ops *af_ops;
461 size_t size;
462
463 /* IFLA_AF_SPEC */
464 size = nla_total_size(sizeof(struct nlattr));
465
466 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
467 if (af_ops->get_link_af_size) {
468 /* AF_* + nested data */
469 size += nla_total_size(sizeof(struct nlattr)) +
470 af_ops->get_link_af_size(dev);
471 }
472 }
473
474 return size;
475 }
476
477 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
478 {
479 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
480 struct nlattr *linkinfo, *data;
481 int err = -EMSGSIZE;
482
483 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
484 if (linkinfo == NULL)
485 goto out;
486
487 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
488 goto err_cancel_link;
489 if (ops->fill_xstats) {
490 err = ops->fill_xstats(skb, dev);
491 if (err < 0)
492 goto err_cancel_link;
493 }
494 if (ops->fill_info) {
495 data = nla_nest_start(skb, IFLA_INFO_DATA);
496 if (data == NULL)
497 goto err_cancel_link;
498 err = ops->fill_info(skb, dev);
499 if (err < 0)
500 goto err_cancel_data;
501 nla_nest_end(skb, data);
502 }
503
504 nla_nest_end(skb, linkinfo);
505 return 0;
506
507 err_cancel_data:
508 nla_nest_cancel(skb, data);
509 err_cancel_link:
510 nla_nest_cancel(skb, linkinfo);
511 out:
512 return err;
513 }
514
515 static const int rtm_min[RTM_NR_FAMILIES] =
516 {
517 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
518 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
519 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
520 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
521 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
522 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
523 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
524 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
525 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
526 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
527 };
528
529 static const int rta_max[RTM_NR_FAMILIES] =
530 {
531 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
532 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
533 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
534 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
535 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
536 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
537 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
538 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
539 };
540
541 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
542 {
543 struct rtattr *rta;
544 int size = RTA_LENGTH(attrlen);
545
546 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
547 rta->rta_type = attrtype;
548 rta->rta_len = size;
549 memcpy(RTA_DATA(rta), data, attrlen);
550 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
551 }
552 EXPORT_SYMBOL(__rta_fill);
553
554 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
555 {
556 struct sock *rtnl = net->rtnl;
557 int err = 0;
558
559 NETLINK_CB(skb).dst_group = group;
560 if (echo)
561 atomic_inc(&skb->users);
562 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
563 if (echo)
564 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
565 return err;
566 }
567
568 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
569 {
570 struct sock *rtnl = net->rtnl;
571
572 return nlmsg_unicast(rtnl, skb, pid);
573 }
574 EXPORT_SYMBOL(rtnl_unicast);
575
576 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
577 struct nlmsghdr *nlh, gfp_t flags)
578 {
579 struct sock *rtnl = net->rtnl;
580 int report = 0;
581
582 if (nlh)
583 report = nlmsg_report(nlh);
584
585 nlmsg_notify(rtnl, skb, pid, group, report, flags);
586 }
587 EXPORT_SYMBOL(rtnl_notify);
588
589 void rtnl_set_sk_err(struct net *net, u32 group, int error)
590 {
591 struct sock *rtnl = net->rtnl;
592
593 netlink_set_err(rtnl, 0, group, error);
594 }
595 EXPORT_SYMBOL(rtnl_set_sk_err);
596
597 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
598 {
599 struct nlattr *mx;
600 int i, valid = 0;
601
602 mx = nla_nest_start(skb, RTA_METRICS);
603 if (mx == NULL)
604 return -ENOBUFS;
605
606 for (i = 0; i < RTAX_MAX; i++) {
607 if (metrics[i]) {
608 valid++;
609 NLA_PUT_U32(skb, i+1, metrics[i]);
610 }
611 }
612
613 if (!valid) {
614 nla_nest_cancel(skb, mx);
615 return 0;
616 }
617
618 return nla_nest_end(skb, mx);
619
620 nla_put_failure:
621 nla_nest_cancel(skb, mx);
622 return -EMSGSIZE;
623 }
624 EXPORT_SYMBOL(rtnetlink_put_metrics);
625
626 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
627 u32 ts, u32 tsage, long expires, u32 error)
628 {
629 struct rta_cacheinfo ci = {
630 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
631 .rta_used = dst->__use,
632 .rta_clntref = atomic_read(&(dst->__refcnt)),
633 .rta_error = error,
634 .rta_id = id,
635 .rta_ts = ts,
636 .rta_tsage = tsage,
637 };
638
639 if (expires)
640 ci.rta_expires = jiffies_to_clock_t(expires);
641
642 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
643 }
644 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
645
646 static void set_operstate(struct net_device *dev, unsigned char transition)
647 {
648 unsigned char operstate = dev->operstate;
649
650 switch (transition) {
651 case IF_OPER_UP:
652 if ((operstate == IF_OPER_DORMANT ||
653 operstate == IF_OPER_UNKNOWN) &&
654 !netif_dormant(dev))
655 operstate = IF_OPER_UP;
656 break;
657
658 case IF_OPER_DORMANT:
659 if (operstate == IF_OPER_UP ||
660 operstate == IF_OPER_UNKNOWN)
661 operstate = IF_OPER_DORMANT;
662 break;
663 }
664
665 if (dev->operstate != operstate) {
666 write_lock_bh(&dev_base_lock);
667 dev->operstate = operstate;
668 write_unlock_bh(&dev_base_lock);
669 netdev_state_change(dev);
670 }
671 }
672
673 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
674 const struct ifinfomsg *ifm)
675 {
676 unsigned int flags = ifm->ifi_flags;
677
678 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
679 if (ifm->ifi_change)
680 flags = (flags & ifm->ifi_change) |
681 (dev->flags & ~ifm->ifi_change);
682
683 return flags;
684 }
685
686 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
687 const struct rtnl_link_stats64 *b)
688 {
689 a->rx_packets = b->rx_packets;
690 a->tx_packets = b->tx_packets;
691 a->rx_bytes = b->rx_bytes;
692 a->tx_bytes = b->tx_bytes;
693 a->rx_errors = b->rx_errors;
694 a->tx_errors = b->tx_errors;
695 a->rx_dropped = b->rx_dropped;
696 a->tx_dropped = b->tx_dropped;
697
698 a->multicast = b->multicast;
699 a->collisions = b->collisions;
700
701 a->rx_length_errors = b->rx_length_errors;
702 a->rx_over_errors = b->rx_over_errors;
703 a->rx_crc_errors = b->rx_crc_errors;
704 a->rx_frame_errors = b->rx_frame_errors;
705 a->rx_fifo_errors = b->rx_fifo_errors;
706 a->rx_missed_errors = b->rx_missed_errors;
707
708 a->tx_aborted_errors = b->tx_aborted_errors;
709 a->tx_carrier_errors = b->tx_carrier_errors;
710 a->tx_fifo_errors = b->tx_fifo_errors;
711 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
712 a->tx_window_errors = b->tx_window_errors;
713
714 a->rx_compressed = b->rx_compressed;
715 a->tx_compressed = b->tx_compressed;
716 }
717
718 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
719 {
720 memcpy(v, b, sizeof(*b));
721 }
722
723 /* All VF info */
724 static inline int rtnl_vfinfo_size(const struct net_device *dev)
725 {
726 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {
727
728 int num_vfs = dev_num_vf(dev->dev.parent);
729 size_t size = nla_total_size(sizeof(struct nlattr));
730 size += nla_total_size(num_vfs * sizeof(struct nlattr));
731 size += num_vfs *
732 (nla_total_size(sizeof(struct ifla_vf_mac)) +
733 nla_total_size(sizeof(struct ifla_vf_vlan)) +
734 nla_total_size(sizeof(struct ifla_vf_tx_rate)));
735 return size;
736 } else
737 return 0;
738 }
739
740 static size_t rtnl_port_size(const struct net_device *dev)
741 {
742 size_t port_size = nla_total_size(4) /* PORT_VF */
743 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
744 + nla_total_size(sizeof(struct ifla_port_vsi))
745 /* PORT_VSI_TYPE */
746 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
747 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
748 + nla_total_size(1) /* PROT_VDP_REQUEST */
749 + nla_total_size(2); /* PORT_VDP_RESPONSE */
750 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
751 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
752 + port_size;
753 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
754 + port_size;
755
756 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
757 return 0;
758 if (dev_num_vf(dev->dev.parent))
759 return port_self_size + vf_ports_size +
760 vf_port_size * dev_num_vf(dev->dev.parent);
761 else
762 return port_self_size;
763 }
764
765 static noinline size_t if_nlmsg_size(const struct net_device *dev)
766 {
767 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
768 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
769 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
770 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
771 + nla_total_size(sizeof(struct rtnl_link_ifmap))
772 + nla_total_size(sizeof(struct rtnl_link_stats))
773 + nla_total_size(sizeof(struct rtnl_link_stats64))
774 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
775 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
776 + nla_total_size(4) /* IFLA_TXQLEN */
777 + nla_total_size(4) /* IFLA_WEIGHT */
778 + nla_total_size(4) /* IFLA_MTU */
779 + nla_total_size(4) /* IFLA_LINK */
780 + nla_total_size(4) /* IFLA_MASTER */
781 + nla_total_size(1) /* IFLA_OPERSTATE */
782 + nla_total_size(1) /* IFLA_LINKMODE */
783 + nla_total_size(4) /* IFLA_NUM_VF */
784 + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
785 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
786 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
787 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
788 }
789
790 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
791 {
792 struct nlattr *vf_ports;
793 struct nlattr *vf_port;
794 int vf;
795 int err;
796
797 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
798 if (!vf_ports)
799 return -EMSGSIZE;
800
801 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
802 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
803 if (!vf_port)
804 goto nla_put_failure;
805 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
806 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
807 if (err == -EMSGSIZE)
808 goto nla_put_failure;
809 if (err) {
810 nla_nest_cancel(skb, vf_port);
811 continue;
812 }
813 nla_nest_end(skb, vf_port);
814 }
815
816 nla_nest_end(skb, vf_ports);
817
818 return 0;
819
820 nla_put_failure:
821 nla_nest_cancel(skb, vf_ports);
822 return -EMSGSIZE;
823 }
824
825 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
826 {
827 struct nlattr *port_self;
828 int err;
829
830 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
831 if (!port_self)
832 return -EMSGSIZE;
833
834 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
835 if (err) {
836 nla_nest_cancel(skb, port_self);
837 return (err == -EMSGSIZE) ? err : 0;
838 }
839
840 nla_nest_end(skb, port_self);
841
842 return 0;
843 }
844
845 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
846 {
847 int err;
848
849 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
850 return 0;
851
852 err = rtnl_port_self_fill(skb, dev);
853 if (err)
854 return err;
855
856 if (dev_num_vf(dev->dev.parent)) {
857 err = rtnl_vf_ports_fill(skb, dev);
858 if (err)
859 return err;
860 }
861
862 return 0;
863 }
864
865 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
866 int type, u32 pid, u32 seq, u32 change,
867 unsigned int flags)
868 {
869 struct ifinfomsg *ifm;
870 struct nlmsghdr *nlh;
871 struct rtnl_link_stats64 temp;
872 const struct rtnl_link_stats64 *stats;
873 struct nlattr *attr, *af_spec;
874 struct rtnl_af_ops *af_ops;
875
876 ASSERT_RTNL();
877 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
878 if (nlh == NULL)
879 return -EMSGSIZE;
880
881 ifm = nlmsg_data(nlh);
882 ifm->ifi_family = AF_UNSPEC;
883 ifm->__ifi_pad = 0;
884 ifm->ifi_type = dev->type;
885 ifm->ifi_index = dev->ifindex;
886 ifm->ifi_flags = dev_get_flags(dev);
887 ifm->ifi_change = change;
888
889 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
890 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
891 NLA_PUT_U8(skb, IFLA_OPERSTATE,
892 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
893 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
894 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
895 NLA_PUT_U32(skb, IFLA_GROUP, dev->group);
896
897 if (dev->ifindex != dev->iflink)
898 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
899
900 if (dev->master)
901 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
902
903 if (dev->qdisc)
904 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
905
906 if (dev->ifalias)
907 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
908
909 if (1) {
910 struct rtnl_link_ifmap map = {
911 .mem_start = dev->mem_start,
912 .mem_end = dev->mem_end,
913 .base_addr = dev->base_addr,
914 .irq = dev->irq,
915 .dma = dev->dma,
916 .port = dev->if_port,
917 };
918 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
919 }
920
921 if (dev->addr_len) {
922 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
923 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
924 }
925
926 attr = nla_reserve(skb, IFLA_STATS,
927 sizeof(struct rtnl_link_stats));
928 if (attr == NULL)
929 goto nla_put_failure;
930
931 stats = dev_get_stats(dev, &temp);
932 copy_rtnl_link_stats(nla_data(attr), stats);
933
934 attr = nla_reserve(skb, IFLA_STATS64,
935 sizeof(struct rtnl_link_stats64));
936 if (attr == NULL)
937 goto nla_put_failure;
938 copy_rtnl_link_stats64(nla_data(attr), stats);
939
940 if (dev->dev.parent)
941 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
942
943 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
944 int i;
945
946 struct nlattr *vfinfo, *vf;
947 int num_vfs = dev_num_vf(dev->dev.parent);
948
949 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
950 if (!vfinfo)
951 goto nla_put_failure;
952 for (i = 0; i < num_vfs; i++) {
953 struct ifla_vf_info ivi;
954 struct ifla_vf_mac vf_mac;
955 struct ifla_vf_vlan vf_vlan;
956 struct ifla_vf_tx_rate vf_tx_rate;
957 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
958 break;
959 vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
960 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
961 vf_vlan.vlan = ivi.vlan;
962 vf_vlan.qos = ivi.qos;
963 vf_tx_rate.rate = ivi.tx_rate;
964 vf = nla_nest_start(skb, IFLA_VF_INFO);
965 if (!vf) {
966 nla_nest_cancel(skb, vfinfo);
967 goto nla_put_failure;
968 }
969 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
970 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
971 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
972 nla_nest_end(skb, vf);
973 }
974 nla_nest_end(skb, vfinfo);
975 }
976
977 if (rtnl_port_fill(skb, dev))
978 goto nla_put_failure;
979
980 if (dev->rtnl_link_ops) {
981 if (rtnl_link_fill(skb, dev) < 0)
982 goto nla_put_failure;
983 }
984
985 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
986 goto nla_put_failure;
987
988 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
989 if (af_ops->fill_link_af) {
990 struct nlattr *af;
991 int err;
992
993 if (!(af = nla_nest_start(skb, af_ops->family)))
994 goto nla_put_failure;
995
996 err = af_ops->fill_link_af(skb, dev);
997
998 /*
999 * Caller may return ENODATA to indicate that there
1000 * was no data to be dumped. This is not an error, it
1001 * means we should trim the attribute header and
1002 * continue.
1003 */
1004 if (err == -ENODATA)
1005 nla_nest_cancel(skb, af);
1006 else if (err < 0)
1007 goto nla_put_failure;
1008
1009 nla_nest_end(skb, af);
1010 }
1011 }
1012
1013 nla_nest_end(skb, af_spec);
1014
1015 return nlmsg_end(skb, nlh);
1016
1017 nla_put_failure:
1018 nlmsg_cancel(skb, nlh);
1019 return -EMSGSIZE;
1020 }
1021
1022 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1023 {
1024 struct net *net = sock_net(skb->sk);
1025 int h, s_h;
1026 int idx = 0, s_idx;
1027 struct net_device *dev;
1028 struct hlist_head *head;
1029 struct hlist_node *node;
1030
1031 s_h = cb->args[0];
1032 s_idx = cb->args[1];
1033
1034 rcu_read_lock();
1035 cb->seq = net->dev_base_seq;
1036
1037 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1038 idx = 0;
1039 head = &net->dev_index_head[h];
1040 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1041 if (idx < s_idx)
1042 goto cont;
1043 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1044 NETLINK_CB(cb->skb).pid,
1045 cb->nlh->nlmsg_seq, 0,
1046 NLM_F_MULTI) <= 0)
1047 goto out;
1048
1049 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1050 cont:
1051 idx++;
1052 }
1053 }
1054 out:
1055 rcu_read_unlock();
1056 cb->args[1] = idx;
1057 cb->args[0] = h;
1058
1059 return skb->len;
1060 }
1061
1062 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1063 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1064 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1065 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1066 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1067 [IFLA_MTU] = { .type = NLA_U32 },
1068 [IFLA_LINK] = { .type = NLA_U32 },
1069 [IFLA_MASTER] = { .type = NLA_U32 },
1070 [IFLA_TXQLEN] = { .type = NLA_U32 },
1071 [IFLA_WEIGHT] = { .type = NLA_U32 },
1072 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1073 [IFLA_LINKMODE] = { .type = NLA_U8 },
1074 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1075 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1076 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1077 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1078 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1079 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1080 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1081 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1082 };
1083 EXPORT_SYMBOL(ifla_policy);
1084
1085 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1086 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1087 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1088 };
1089
1090 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1091 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1092 };
1093
1094 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1095 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1096 .len = sizeof(struct ifla_vf_mac) },
1097 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1098 .len = sizeof(struct ifla_vf_vlan) },
1099 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1100 .len = sizeof(struct ifla_vf_tx_rate) },
1101 };
1102
1103 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1104 [IFLA_PORT_VF] = { .type = NLA_U32 },
1105 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1106 .len = PORT_PROFILE_MAX },
1107 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1108 .len = sizeof(struct ifla_port_vsi)},
1109 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1110 .len = PORT_UUID_MAX },
1111 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1112 .len = PORT_UUID_MAX },
1113 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1114 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1115 };
1116
1117 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1118 {
1119 struct net *net;
1120 /* Examine the link attributes and figure out which
1121 * network namespace we are talking about.
1122 */
1123 if (tb[IFLA_NET_NS_PID])
1124 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1125 else if (tb[IFLA_NET_NS_FD])
1126 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1127 else
1128 net = get_net(src_net);
1129 return net;
1130 }
1131 EXPORT_SYMBOL(rtnl_link_get_net);
1132
1133 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1134 {
1135 if (dev) {
1136 if (tb[IFLA_ADDRESS] &&
1137 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1138 return -EINVAL;
1139
1140 if (tb[IFLA_BROADCAST] &&
1141 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1142 return -EINVAL;
1143 }
1144
1145 if (tb[IFLA_AF_SPEC]) {
1146 struct nlattr *af;
1147 int rem, err;
1148
1149 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1150 const struct rtnl_af_ops *af_ops;
1151
1152 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1153 return -EAFNOSUPPORT;
1154
1155 if (!af_ops->set_link_af)
1156 return -EOPNOTSUPP;
1157
1158 if (af_ops->validate_link_af) {
1159 err = af_ops->validate_link_af(dev, af);
1160 if (err < 0)
1161 return err;
1162 }
1163 }
1164 }
1165
1166 return 0;
1167 }
1168
1169 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1170 {
1171 int rem, err = -EINVAL;
1172 struct nlattr *vf;
1173 const struct net_device_ops *ops = dev->netdev_ops;
1174
1175 nla_for_each_nested(vf, attr, rem) {
1176 switch (nla_type(vf)) {
1177 case IFLA_VF_MAC: {
1178 struct ifla_vf_mac *ivm;
1179 ivm = nla_data(vf);
1180 err = -EOPNOTSUPP;
1181 if (ops->ndo_set_vf_mac)
1182 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1183 ivm->mac);
1184 break;
1185 }
1186 case IFLA_VF_VLAN: {
1187 struct ifla_vf_vlan *ivv;
1188 ivv = nla_data(vf);
1189 err = -EOPNOTSUPP;
1190 if (ops->ndo_set_vf_vlan)
1191 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1192 ivv->vlan,
1193 ivv->qos);
1194 break;
1195 }
1196 case IFLA_VF_TX_RATE: {
1197 struct ifla_vf_tx_rate *ivt;
1198 ivt = nla_data(vf);
1199 err = -EOPNOTSUPP;
1200 if (ops->ndo_set_vf_tx_rate)
1201 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1202 ivt->rate);
1203 break;
1204 }
1205 default:
1206 err = -EINVAL;
1207 break;
1208 }
1209 if (err)
1210 break;
1211 }
1212 return err;
1213 }
1214
1215 static int do_set_master(struct net_device *dev, int ifindex)
1216 {
1217 struct net_device *master_dev;
1218 const struct net_device_ops *ops;
1219 int err;
1220
1221 if (dev->master) {
1222 if (dev->master->ifindex == ifindex)
1223 return 0;
1224 ops = dev->master->netdev_ops;
1225 if (ops->ndo_del_slave) {
1226 err = ops->ndo_del_slave(dev->master, dev);
1227 if (err)
1228 return err;
1229 } else {
1230 return -EOPNOTSUPP;
1231 }
1232 }
1233
1234 if (ifindex) {
1235 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1236 if (!master_dev)
1237 return -EINVAL;
1238 ops = master_dev->netdev_ops;
1239 if (ops->ndo_add_slave) {
1240 err = ops->ndo_add_slave(master_dev, dev);
1241 if (err)
1242 return err;
1243 } else {
1244 return -EOPNOTSUPP;
1245 }
1246 }
1247 return 0;
1248 }
1249
1250 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1251 struct nlattr **tb, char *ifname, int modified)
1252 {
1253 const struct net_device_ops *ops = dev->netdev_ops;
1254 int send_addr_notify = 0;
1255 int err;
1256
1257 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1258 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1259 if (IS_ERR(net)) {
1260 err = PTR_ERR(net);
1261 goto errout;
1262 }
1263 err = dev_change_net_namespace(dev, net, ifname);
1264 put_net(net);
1265 if (err)
1266 goto errout;
1267 modified = 1;
1268 }
1269
1270 if (tb[IFLA_MAP]) {
1271 struct rtnl_link_ifmap *u_map;
1272 struct ifmap k_map;
1273
1274 if (!ops->ndo_set_config) {
1275 err = -EOPNOTSUPP;
1276 goto errout;
1277 }
1278
1279 if (!netif_device_present(dev)) {
1280 err = -ENODEV;
1281 goto errout;
1282 }
1283
1284 u_map = nla_data(tb[IFLA_MAP]);
1285 k_map.mem_start = (unsigned long) u_map->mem_start;
1286 k_map.mem_end = (unsigned long) u_map->mem_end;
1287 k_map.base_addr = (unsigned short) u_map->base_addr;
1288 k_map.irq = (unsigned char) u_map->irq;
1289 k_map.dma = (unsigned char) u_map->dma;
1290 k_map.port = (unsigned char) u_map->port;
1291
1292 err = ops->ndo_set_config(dev, &k_map);
1293 if (err < 0)
1294 goto errout;
1295
1296 modified = 1;
1297 }
1298
1299 if (tb[IFLA_ADDRESS]) {
1300 struct sockaddr *sa;
1301 int len;
1302
1303 if (!ops->ndo_set_mac_address) {
1304 err = -EOPNOTSUPP;
1305 goto errout;
1306 }
1307
1308 if (!netif_device_present(dev)) {
1309 err = -ENODEV;
1310 goto errout;
1311 }
1312
1313 len = sizeof(sa_family_t) + dev->addr_len;
1314 sa = kmalloc(len, GFP_KERNEL);
1315 if (!sa) {
1316 err = -ENOMEM;
1317 goto errout;
1318 }
1319 sa->sa_family = dev->type;
1320 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1321 dev->addr_len);
1322 err = ops->ndo_set_mac_address(dev, sa);
1323 kfree(sa);
1324 if (err)
1325 goto errout;
1326 send_addr_notify = 1;
1327 modified = 1;
1328 }
1329
1330 if (tb[IFLA_MTU]) {
1331 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1332 if (err < 0)
1333 goto errout;
1334 modified = 1;
1335 }
1336
1337 if (tb[IFLA_GROUP]) {
1338 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1339 modified = 1;
1340 }
1341
1342 /*
1343 * Interface selected by interface index but interface
1344 * name provided implies that a name change has been
1345 * requested.
1346 */
1347 if (ifm->ifi_index > 0 && ifname[0]) {
1348 err = dev_change_name(dev, ifname);
1349 if (err < 0)
1350 goto errout;
1351 modified = 1;
1352 }
1353
1354 if (tb[IFLA_IFALIAS]) {
1355 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1356 nla_len(tb[IFLA_IFALIAS]));
1357 if (err < 0)
1358 goto errout;
1359 modified = 1;
1360 }
1361
1362 if (tb[IFLA_BROADCAST]) {
1363 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1364 send_addr_notify = 1;
1365 }
1366
1367 if (ifm->ifi_flags || ifm->ifi_change) {
1368 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1369 if (err < 0)
1370 goto errout;
1371 }
1372
1373 if (tb[IFLA_MASTER]) {
1374 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1375 if (err)
1376 goto errout;
1377 modified = 1;
1378 }
1379
1380 if (tb[IFLA_TXQLEN])
1381 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1382
1383 if (tb[IFLA_OPERSTATE])
1384 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1385
1386 if (tb[IFLA_LINKMODE]) {
1387 write_lock_bh(&dev_base_lock);
1388 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1389 write_unlock_bh(&dev_base_lock);
1390 }
1391
1392 if (tb[IFLA_VFINFO_LIST]) {
1393 struct nlattr *attr;
1394 int rem;
1395 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1396 if (nla_type(attr) != IFLA_VF_INFO) {
1397 err = -EINVAL;
1398 goto errout;
1399 }
1400 err = do_setvfinfo(dev, attr);
1401 if (err < 0)
1402 goto errout;
1403 modified = 1;
1404 }
1405 }
1406 err = 0;
1407
1408 if (tb[IFLA_VF_PORTS]) {
1409 struct nlattr *port[IFLA_PORT_MAX+1];
1410 struct nlattr *attr;
1411 int vf;
1412 int rem;
1413
1414 err = -EOPNOTSUPP;
1415 if (!ops->ndo_set_vf_port)
1416 goto errout;
1417
1418 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1419 if (nla_type(attr) != IFLA_VF_PORT)
1420 continue;
1421 err = nla_parse_nested(port, IFLA_PORT_MAX,
1422 attr, ifla_port_policy);
1423 if (err < 0)
1424 goto errout;
1425 if (!port[IFLA_PORT_VF]) {
1426 err = -EOPNOTSUPP;
1427 goto errout;
1428 }
1429 vf = nla_get_u32(port[IFLA_PORT_VF]);
1430 err = ops->ndo_set_vf_port(dev, vf, port);
1431 if (err < 0)
1432 goto errout;
1433 modified = 1;
1434 }
1435 }
1436 err = 0;
1437
1438 if (tb[IFLA_PORT_SELF]) {
1439 struct nlattr *port[IFLA_PORT_MAX+1];
1440
1441 err = nla_parse_nested(port, IFLA_PORT_MAX,
1442 tb[IFLA_PORT_SELF], ifla_port_policy);
1443 if (err < 0)
1444 goto errout;
1445
1446 err = -EOPNOTSUPP;
1447 if (ops->ndo_set_vf_port)
1448 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1449 if (err < 0)
1450 goto errout;
1451 modified = 1;
1452 }
1453
1454 if (tb[IFLA_AF_SPEC]) {
1455 struct nlattr *af;
1456 int rem;
1457
1458 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1459 const struct rtnl_af_ops *af_ops;
1460
1461 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1462 BUG();
1463
1464 err = af_ops->set_link_af(dev, af);
1465 if (err < 0)
1466 goto errout;
1467
1468 modified = 1;
1469 }
1470 }
1471 err = 0;
1472
1473 errout:
1474 if (err < 0 && modified && net_ratelimit())
1475 printk(KERN_WARNING "A link change request failed with "
1476 "some changes committed already. Interface %s may "
1477 "have been left with an inconsistent configuration, "
1478 "please check.\n", dev->name);
1479
1480 if (send_addr_notify)
1481 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1482 return err;
1483 }
1484
1485 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1486 {
1487 struct net *net = sock_net(skb->sk);
1488 struct ifinfomsg *ifm;
1489 struct net_device *dev;
1490 int err;
1491 struct nlattr *tb[IFLA_MAX+1];
1492 char ifname[IFNAMSIZ];
1493
1494 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1495 if (err < 0)
1496 goto errout;
1497
1498 if (tb[IFLA_IFNAME])
1499 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1500 else
1501 ifname[0] = '\0';
1502
1503 err = -EINVAL;
1504 ifm = nlmsg_data(nlh);
1505 if (ifm->ifi_index > 0)
1506 dev = __dev_get_by_index(net, ifm->ifi_index);
1507 else if (tb[IFLA_IFNAME])
1508 dev = __dev_get_by_name(net, ifname);
1509 else
1510 goto errout;
1511
1512 if (dev == NULL) {
1513 err = -ENODEV;
1514 goto errout;
1515 }
1516
1517 err = validate_linkmsg(dev, tb);
1518 if (err < 0)
1519 goto errout;
1520
1521 err = do_setlink(dev, ifm, tb, ifname, 0);
1522 errout:
1523 return err;
1524 }
1525
1526 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1527 {
1528 struct net *net = sock_net(skb->sk);
1529 const struct rtnl_link_ops *ops;
1530 struct net_device *dev;
1531 struct ifinfomsg *ifm;
1532 char ifname[IFNAMSIZ];
1533 struct nlattr *tb[IFLA_MAX+1];
1534 int err;
1535 LIST_HEAD(list_kill);
1536
1537 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1538 if (err < 0)
1539 return err;
1540
1541 if (tb[IFLA_IFNAME])
1542 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1543
1544 ifm = nlmsg_data(nlh);
1545 if (ifm->ifi_index > 0)
1546 dev = __dev_get_by_index(net, ifm->ifi_index);
1547 else if (tb[IFLA_IFNAME])
1548 dev = __dev_get_by_name(net, ifname);
1549 else
1550 return -EINVAL;
1551
1552 if (!dev)
1553 return -ENODEV;
1554
1555 ops = dev->rtnl_link_ops;
1556 if (!ops)
1557 return -EOPNOTSUPP;
1558
1559 ops->dellink(dev, &list_kill);
1560 unregister_netdevice_many(&list_kill);
1561 list_del(&list_kill);
1562 return 0;
1563 }
1564
1565 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1566 {
1567 unsigned int old_flags;
1568 int err;
1569
1570 old_flags = dev->flags;
1571 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1572 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1573 if (err < 0)
1574 return err;
1575 }
1576
1577 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1578 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1579
1580 __dev_notify_flags(dev, old_flags);
1581 return 0;
1582 }
1583 EXPORT_SYMBOL(rtnl_configure_link);
1584
1585 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1586 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1587 {
1588 int err;
1589 struct net_device *dev;
1590 unsigned int num_queues = 1;
1591 unsigned int real_num_queues = 1;
1592
1593 if (ops->get_tx_queues) {
1594 err = ops->get_tx_queues(src_net, tb, &num_queues,
1595 &real_num_queues);
1596 if (err)
1597 goto err;
1598 }
1599 err = -ENOMEM;
1600 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1601 if (!dev)
1602 goto err;
1603
1604 dev_net_set(dev, net);
1605 dev->rtnl_link_ops = ops;
1606 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1607 dev->real_num_tx_queues = real_num_queues;
1608
1609 if (tb[IFLA_MTU])
1610 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1611 if (tb[IFLA_ADDRESS])
1612 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1613 nla_len(tb[IFLA_ADDRESS]));
1614 if (tb[IFLA_BROADCAST])
1615 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1616 nla_len(tb[IFLA_BROADCAST]));
1617 if (tb[IFLA_TXQLEN])
1618 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1619 if (tb[IFLA_OPERSTATE])
1620 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1621 if (tb[IFLA_LINKMODE])
1622 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1623 if (tb[IFLA_GROUP])
1624 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1625
1626 return dev;
1627
1628 err:
1629 return ERR_PTR(err);
1630 }
1631 EXPORT_SYMBOL(rtnl_create_link);
1632
1633 static int rtnl_group_changelink(struct net *net, int group,
1634 struct ifinfomsg *ifm,
1635 struct nlattr **tb)
1636 {
1637 struct net_device *dev;
1638 int err;
1639
1640 for_each_netdev(net, dev) {
1641 if (dev->group == group) {
1642 err = do_setlink(dev, ifm, tb, NULL, 0);
1643 if (err < 0)
1644 return err;
1645 }
1646 }
1647
1648 return 0;
1649 }
1650
1651 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1652 {
1653 struct net *net = sock_net(skb->sk);
1654 const struct rtnl_link_ops *ops;
1655 struct net_device *dev;
1656 struct ifinfomsg *ifm;
1657 char kind[MODULE_NAME_LEN];
1658 char ifname[IFNAMSIZ];
1659 struct nlattr *tb[IFLA_MAX+1];
1660 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1661 int err;
1662
1663 #ifdef CONFIG_MODULES
1664 replay:
1665 #endif
1666 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1667 if (err < 0)
1668 return err;
1669
1670 if (tb[IFLA_IFNAME])
1671 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1672 else
1673 ifname[0] = '\0';
1674
1675 ifm = nlmsg_data(nlh);
1676 if (ifm->ifi_index > 0)
1677 dev = __dev_get_by_index(net, ifm->ifi_index);
1678 else {
1679 if (ifname[0])
1680 dev = __dev_get_by_name(net, ifname);
1681 else
1682 dev = NULL;
1683 }
1684
1685 err = validate_linkmsg(dev, tb);
1686 if (err < 0)
1687 return err;
1688
1689 if (tb[IFLA_LINKINFO]) {
1690 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1691 tb[IFLA_LINKINFO], ifla_info_policy);
1692 if (err < 0)
1693 return err;
1694 } else
1695 memset(linkinfo, 0, sizeof(linkinfo));
1696
1697 if (linkinfo[IFLA_INFO_KIND]) {
1698 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1699 ops = rtnl_link_ops_get(kind);
1700 } else {
1701 kind[0] = '\0';
1702 ops = NULL;
1703 }
1704
1705 if (1) {
1706 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1707 struct net *dest_net;
1708
1709 if (ops) {
1710 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1711 err = nla_parse_nested(attr, ops->maxtype,
1712 linkinfo[IFLA_INFO_DATA],
1713 ops->policy);
1714 if (err < 0)
1715 return err;
1716 data = attr;
1717 }
1718 if (ops->validate) {
1719 err = ops->validate(tb, data);
1720 if (err < 0)
1721 return err;
1722 }
1723 }
1724
1725 if (dev) {
1726 int modified = 0;
1727
1728 if (nlh->nlmsg_flags & NLM_F_EXCL)
1729 return -EEXIST;
1730 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1731 return -EOPNOTSUPP;
1732
1733 if (linkinfo[IFLA_INFO_DATA]) {
1734 if (!ops || ops != dev->rtnl_link_ops ||
1735 !ops->changelink)
1736 return -EOPNOTSUPP;
1737
1738 err = ops->changelink(dev, tb, data);
1739 if (err < 0)
1740 return err;
1741 modified = 1;
1742 }
1743
1744 return do_setlink(dev, ifm, tb, ifname, modified);
1745 }
1746
1747 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1748 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1749 return rtnl_group_changelink(net,
1750 nla_get_u32(tb[IFLA_GROUP]),
1751 ifm, tb);
1752 return -ENODEV;
1753 }
1754
1755 if (ifm->ifi_index)
1756 return -EOPNOTSUPP;
1757 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1758 return -EOPNOTSUPP;
1759
1760 if (!ops) {
1761 #ifdef CONFIG_MODULES
1762 if (kind[0]) {
1763 __rtnl_unlock();
1764 request_module("rtnl-link-%s", kind);
1765 rtnl_lock();
1766 ops = rtnl_link_ops_get(kind);
1767 if (ops)
1768 goto replay;
1769 }
1770 #endif
1771 return -EOPNOTSUPP;
1772 }
1773
1774 if (!ifname[0])
1775 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1776
1777 dest_net = rtnl_link_get_net(net, tb);
1778 if (IS_ERR(dest_net))
1779 return PTR_ERR(dest_net);
1780
1781 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1782
1783 if (IS_ERR(dev))
1784 err = PTR_ERR(dev);
1785 else if (ops->newlink)
1786 err = ops->newlink(net, dev, tb, data);
1787 else
1788 err = register_netdevice(dev);
1789
1790 if (err < 0 && !IS_ERR(dev))
1791 free_netdev(dev);
1792 if (err < 0)
1793 goto out;
1794
1795 err = rtnl_configure_link(dev, ifm);
1796 if (err < 0)
1797 unregister_netdevice(dev);
1798 out:
1799 put_net(dest_net);
1800 return err;
1801 }
1802 }
1803
1804 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1805 {
1806 struct net *net = sock_net(skb->sk);
1807 struct ifinfomsg *ifm;
1808 char ifname[IFNAMSIZ];
1809 struct nlattr *tb[IFLA_MAX+1];
1810 struct net_device *dev = NULL;
1811 struct sk_buff *nskb;
1812 int err;
1813
1814 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1815 if (err < 0)
1816 return err;
1817
1818 if (tb[IFLA_IFNAME])
1819 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1820
1821 ifm = nlmsg_data(nlh);
1822 if (ifm->ifi_index > 0)
1823 dev = __dev_get_by_index(net, ifm->ifi_index);
1824 else if (tb[IFLA_IFNAME])
1825 dev = __dev_get_by_name(net, ifname);
1826 else
1827 return -EINVAL;
1828
1829 if (dev == NULL)
1830 return -ENODEV;
1831
1832 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1833 if (nskb == NULL)
1834 return -ENOBUFS;
1835
1836 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1837 nlh->nlmsg_seq, 0, 0);
1838 if (err < 0) {
1839 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1840 WARN_ON(err == -EMSGSIZE);
1841 kfree_skb(nskb);
1842 } else
1843 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1844
1845 return err;
1846 }
1847
1848 static u16 rtnl_calcit(struct sk_buff *skb)
1849 {
1850 return min_ifinfo_dump_size;
1851 }
1852
1853 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1854 {
1855 int idx;
1856 int s_idx = cb->family;
1857
1858 if (s_idx == 0)
1859 s_idx = 1;
1860 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1861 int type = cb->nlh->nlmsg_type-RTM_BASE;
1862 if (idx < s_idx || idx == PF_PACKET)
1863 continue;
1864 if (rtnl_msg_handlers[idx] == NULL ||
1865 rtnl_msg_handlers[idx][type].dumpit == NULL)
1866 continue;
1867 if (idx > s_idx)
1868 memset(&cb->args[0], 0, sizeof(cb->args));
1869 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1870 break;
1871 }
1872 cb->family = idx;
1873
1874 return skb->len;
1875 }
1876
1877 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1878 {
1879 struct net *net = dev_net(dev);
1880 struct sk_buff *skb;
1881 int err = -ENOBUFS;
1882 size_t if_info_size;
1883
1884 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev)), GFP_KERNEL);
1885 if (skb == NULL)
1886 goto errout;
1887
1888 min_ifinfo_dump_size = max_t(u16, if_info_size, min_ifinfo_dump_size);
1889
1890 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1891 if (err < 0) {
1892 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1893 WARN_ON(err == -EMSGSIZE);
1894 kfree_skb(skb);
1895 goto errout;
1896 }
1897 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1898 return;
1899 errout:
1900 if (err < 0)
1901 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1902 }
1903
1904 /* Protected by RTNL sempahore. */
1905 static struct rtattr **rta_buf;
1906 static int rtattr_max;
1907
1908 /* Process one rtnetlink message. */
1909
1910 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1911 {
1912 struct net *net = sock_net(skb->sk);
1913 rtnl_doit_func doit;
1914 int sz_idx, kind;
1915 int min_len;
1916 int family;
1917 int type;
1918 int err;
1919
1920 type = nlh->nlmsg_type;
1921 if (type > RTM_MAX)
1922 return -EOPNOTSUPP;
1923
1924 type -= RTM_BASE;
1925
1926 /* All the messages must have at least 1 byte length */
1927 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1928 return 0;
1929
1930 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1931 sz_idx = type>>2;
1932 kind = type&3;
1933
1934 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1935 return -EPERM;
1936
1937 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1938 struct sock *rtnl;
1939 rtnl_dumpit_func dumpit;
1940 rtnl_calcit_func calcit;
1941 u16 min_dump_alloc = 0;
1942
1943 dumpit = rtnl_get_dumpit(family, type);
1944 if (dumpit == NULL)
1945 return -EOPNOTSUPP;
1946 calcit = rtnl_get_calcit(family, type);
1947 if (calcit)
1948 min_dump_alloc = calcit(skb);
1949
1950 __rtnl_unlock();
1951 rtnl = net->rtnl;
1952 err = netlink_dump_start(rtnl, skb, nlh, dumpit,
1953 NULL, min_dump_alloc);
1954 rtnl_lock();
1955 return err;
1956 }
1957
1958 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1959
1960 min_len = rtm_min[sz_idx];
1961 if (nlh->nlmsg_len < min_len)
1962 return -EINVAL;
1963
1964 if (nlh->nlmsg_len > min_len) {
1965 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1966 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1967
1968 while (RTA_OK(attr, attrlen)) {
1969 unsigned flavor = attr->rta_type;
1970 if (flavor) {
1971 if (flavor > rta_max[sz_idx])
1972 return -EINVAL;
1973 rta_buf[flavor-1] = attr;
1974 }
1975 attr = RTA_NEXT(attr, attrlen);
1976 }
1977 }
1978
1979 doit = rtnl_get_doit(family, type);
1980 if (doit == NULL)
1981 return -EOPNOTSUPP;
1982
1983 return doit(skb, nlh, (void *)&rta_buf[0]);
1984 }
1985
1986 static void rtnetlink_rcv(struct sk_buff *skb)
1987 {
1988 rtnl_lock();
1989 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1990 rtnl_unlock();
1991 }
1992
1993 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1994 {
1995 struct net_device *dev = ptr;
1996
1997 switch (event) {
1998 case NETDEV_UP:
1999 case NETDEV_DOWN:
2000 case NETDEV_PRE_UP:
2001 case NETDEV_POST_INIT:
2002 case NETDEV_REGISTER:
2003 case NETDEV_CHANGE:
2004 case NETDEV_PRE_TYPE_CHANGE:
2005 case NETDEV_GOING_DOWN:
2006 case NETDEV_UNREGISTER:
2007 case NETDEV_UNREGISTER_BATCH:
2008 case NETDEV_RELEASE:
2009 case NETDEV_JOIN:
2010 break;
2011 default:
2012 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2013 break;
2014 }
2015 return NOTIFY_DONE;
2016 }
2017
2018 static struct notifier_block rtnetlink_dev_notifier = {
2019 .notifier_call = rtnetlink_event,
2020 };
2021
2022
2023 static int __net_init rtnetlink_net_init(struct net *net)
2024 {
2025 struct sock *sk;
2026 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2027 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2028 if (!sk)
2029 return -ENOMEM;
2030 net->rtnl = sk;
2031 return 0;
2032 }
2033
2034 static void __net_exit rtnetlink_net_exit(struct net *net)
2035 {
2036 netlink_kernel_release(net->rtnl);
2037 net->rtnl = NULL;
2038 }
2039
2040 static struct pernet_operations rtnetlink_net_ops = {
2041 .init = rtnetlink_net_init,
2042 .exit = rtnetlink_net_exit,
2043 };
2044
2045 void __init rtnetlink_init(void)
2046 {
2047 int i;
2048
2049 rtattr_max = 0;
2050 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2051 if (rta_max[i] > rtattr_max)
2052 rtattr_max = rta_max[i];
2053 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2054 if (!rta_buf)
2055 panic("rtnetlink_init: cannot allocate rta_buf\n");
2056
2057 if (register_pernet_subsys(&rtnetlink_net_ops))
2058 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2059
2060 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2061 register_netdevice_notifier(&rtnetlink_dev_notifier);
2062
2063 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2064 rtnl_dump_ifinfo, rtnl_calcit);
2065 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2066 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2067 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2068
2069 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2070 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2071 }
2072