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nfsd: make nfs4xdr WRITEMEM safe against zero count
[linux-2.6.git] / net / core / rtnetlink.c
blobcf857c4dc7b12ab6e0ca2d79d17a036844a8eb53
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/nsproxy.h>
39
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42 #include <asm/string.h>
43
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <net/ip.h>
47 #include <net/protocol.h>
48 #include <net/arp.h>
49 #include <net/route.h>
50 #include <net/udp.h>
51 #include <net/sock.h>
52 #include <net/pkt_sched.h>
53 #include <net/fib_rules.h>
54 #include <net/rtnetlink.h>
55
56 struct rtnl_link
57 {
58 rtnl_doit_func doit;
59 rtnl_dumpit_func dumpit;
60 };
61
62 static DEFINE_MUTEX(rtnl_mutex);
63
64 void rtnl_lock(void)
65 {
66 mutex_lock(&rtnl_mutex);
67 }
68
69 void __rtnl_unlock(void)
70 {
71 mutex_unlock(&rtnl_mutex);
72 }
73
74 void rtnl_unlock(void)
75 {
76 mutex_unlock(&rtnl_mutex);
77 netdev_run_todo();
78 }
79
80 int rtnl_trylock(void)
81 {
82 return mutex_trylock(&rtnl_mutex);
83 }
84
85 int rtnl_is_locked(void)
86 {
87 return mutex_is_locked(&rtnl_mutex);
88 }
89
90 static struct rtnl_link *rtnl_msg_handlers[NPROTO];
91
92 static inline int rtm_msgindex(int msgtype)
93 {
94 int msgindex = msgtype - RTM_BASE;
95
96 /*
97 * msgindex < 0 implies someone tried to register a netlink
98 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
99 * the message type has not been added to linux/rtnetlink.h
100 */
101 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
102
103 return msgindex;
104 }
105
106 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
107 {
108 struct rtnl_link *tab;
109
110 tab = rtnl_msg_handlers[protocol];
111 if (tab == NULL || tab[msgindex].doit == NULL)
112 tab = rtnl_msg_handlers[PF_UNSPEC];
113
114 return tab ? tab[msgindex].doit : NULL;
115 }
116
117 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
118 {
119 struct rtnl_link *tab;
120
121 tab = rtnl_msg_handlers[protocol];
122 if (tab == NULL || tab[msgindex].dumpit == NULL)
123 tab = rtnl_msg_handlers[PF_UNSPEC];
124
125 return tab ? tab[msgindex].dumpit : NULL;
126 }
127
128 /**
129 * __rtnl_register - Register a rtnetlink message type
130 * @protocol: Protocol family or PF_UNSPEC
131 * @msgtype: rtnetlink message type
132 * @doit: Function pointer called for each request message
133 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
134 *
135 * Registers the specified function pointers (at least one of them has
136 * to be non-NULL) to be called whenever a request message for the
137 * specified protocol family and message type is received.
138 *
139 * The special protocol family PF_UNSPEC may be used to define fallback
140 * function pointers for the case when no entry for the specific protocol
141 * family exists.
142 *
143 * Returns 0 on success or a negative error code.
144 */
145 int __rtnl_register(int protocol, int msgtype,
146 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
147 {
148 struct rtnl_link *tab;
149 int msgindex;
150
151 BUG_ON(protocol < 0 || protocol >= NPROTO);
152 msgindex = rtm_msgindex(msgtype);
153
154 tab = rtnl_msg_handlers[protocol];
155 if (tab == NULL) {
156 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
157 if (tab == NULL)
158 return -ENOBUFS;
159
160 rtnl_msg_handlers[protocol] = tab;
161 }
162
163 if (doit)
164 tab[msgindex].doit = doit;
165
166 if (dumpit)
167 tab[msgindex].dumpit = dumpit;
168
169 return 0;
170 }
171
172 EXPORT_SYMBOL_GPL(__rtnl_register);
173
174 /**
175 * rtnl_register - Register a rtnetlink message type
176 *
177 * Identical to __rtnl_register() but panics on failure. This is useful
178 * as failure of this function is very unlikely, it can only happen due
179 * to lack of memory when allocating the chain to store all message
180 * handlers for a protocol. Meant for use in init functions where lack
181 * of memory implies no sense in continueing.
182 */
183 void rtnl_register(int protocol, int msgtype,
184 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
185 {
186 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
187 panic("Unable to register rtnetlink message handler, "
188 "protocol = %d, message type = %d\n",
189 protocol, msgtype);
190 }
191
192 EXPORT_SYMBOL_GPL(rtnl_register);
193
194 /**
195 * rtnl_unregister - Unregister a rtnetlink message type
196 * @protocol: Protocol family or PF_UNSPEC
197 * @msgtype: rtnetlink message type
198 *
199 * Returns 0 on success or a negative error code.
200 */
201 int rtnl_unregister(int protocol, int msgtype)
202 {
203 int msgindex;
204
205 BUG_ON(protocol < 0 || protocol >= NPROTO);
206 msgindex = rtm_msgindex(msgtype);
207
208 if (rtnl_msg_handlers[protocol] == NULL)
209 return -ENOENT;
210
211 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
212 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
213
214 return 0;
215 }
216
217 EXPORT_SYMBOL_GPL(rtnl_unregister);
218
219 /**
220 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
221 * @protocol : Protocol family or PF_UNSPEC
222 *
223 * Identical to calling rtnl_unregster() for all registered message types
224 * of a certain protocol family.
225 */
226 void rtnl_unregister_all(int protocol)
227 {
228 BUG_ON(protocol < 0 || protocol >= NPROTO);
229
230 kfree(rtnl_msg_handlers[protocol]);
231 rtnl_msg_handlers[protocol] = NULL;
232 }
233
234 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
235
236 static LIST_HEAD(link_ops);
237
238 /**
239 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
240 * @ops: struct rtnl_link_ops * to register
241 *
242 * The caller must hold the rtnl_mutex. This function should be used
243 * by drivers that create devices during module initialization. It
244 * must be called before registering the devices.
245 *
246 * Returns 0 on success or a negative error code.
247 */
248 int __rtnl_link_register(struct rtnl_link_ops *ops)
249 {
250 if (!ops->dellink)
251 ops->dellink = unregister_netdevice;
252
253 list_add_tail(&ops->list, &link_ops);
254 return 0;
255 }
256
257 EXPORT_SYMBOL_GPL(__rtnl_link_register);
258
259 /**
260 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
261 * @ops: struct rtnl_link_ops * to register
262 *
263 * Returns 0 on success or a negative error code.
264 */
265 int rtnl_link_register(struct rtnl_link_ops *ops)
266 {
267 int err;
268
269 rtnl_lock();
270 err = __rtnl_link_register(ops);
271 rtnl_unlock();
272 return err;
273 }
274
275 EXPORT_SYMBOL_GPL(rtnl_link_register);
276
277 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
278 {
279 struct net_device *dev;
280 restart:
281 for_each_netdev(net, dev) {
282 if (dev->rtnl_link_ops == ops) {
283 ops->dellink(dev);
284 goto restart;
285 }
286 }
287 }
288
289 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
290 {
291 rtnl_lock();
292 __rtnl_kill_links(net, ops);
293 rtnl_unlock();
294 }
295 EXPORT_SYMBOL_GPL(rtnl_kill_links);
296
297 /**
298 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
299 * @ops: struct rtnl_link_ops * to unregister
300 *
301 * The caller must hold the rtnl_mutex.
302 */
303 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
304 {
305 struct net *net;
306
307 for_each_net(net) {
308 __rtnl_kill_links(net, ops);
309 }
310 list_del(&ops->list);
311 }
312
313 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
314
315 /**
316 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
317 * @ops: struct rtnl_link_ops * to unregister
318 */
319 void rtnl_link_unregister(struct rtnl_link_ops *ops)
320 {
321 rtnl_lock();
322 __rtnl_link_unregister(ops);
323 rtnl_unlock();
324 }
325
326 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
327
328 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
329 {
330 const struct rtnl_link_ops *ops;
331
332 list_for_each_entry(ops, &link_ops, list) {
333 if (!strcmp(ops->kind, kind))
334 return ops;
335 }
336 return NULL;
337 }
338
339 static size_t rtnl_link_get_size(const struct net_device *dev)
340 {
341 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
342 size_t size;
343
344 if (!ops)
345 return 0;
346
347 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
348 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
349
350 if (ops->get_size)
351 /* IFLA_INFO_DATA + nested data */
352 size += nlmsg_total_size(sizeof(struct nlattr)) +
353 ops->get_size(dev);
354
355 if (ops->get_xstats_size)
356 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
357
358 return size;
359 }
360
361 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
362 {
363 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
364 struct nlattr *linkinfo, *data;
365 int err = -EMSGSIZE;
366
367 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
368 if (linkinfo == NULL)
369 goto out;
370
371 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
372 goto err_cancel_link;
373 if (ops->fill_xstats) {
374 err = ops->fill_xstats(skb, dev);
375 if (err < 0)
376 goto err_cancel_link;
377 }
378 if (ops->fill_info) {
379 data = nla_nest_start(skb, IFLA_INFO_DATA);
380 if (data == NULL)
381 goto err_cancel_link;
382 err = ops->fill_info(skb, dev);
383 if (err < 0)
384 goto err_cancel_data;
385 nla_nest_end(skb, data);
386 }
387
388 nla_nest_end(skb, linkinfo);
389 return 0;
390
391 err_cancel_data:
392 nla_nest_cancel(skb, data);
393 err_cancel_link:
394 nla_nest_cancel(skb, linkinfo);
395 out:
396 return err;
397 }
398
399 static const int rtm_min[RTM_NR_FAMILIES] =
400 {
401 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
402 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
403 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
404 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
405 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
406 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
407 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
408 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
409 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
410 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
411 };
412
413 static const int rta_max[RTM_NR_FAMILIES] =
414 {
415 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
416 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
417 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
418 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
419 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
420 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
421 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
422 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
423 };
424
425 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
426 {
427 struct rtattr *rta;
428 int size = RTA_LENGTH(attrlen);
429
430 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
431 rta->rta_type = attrtype;
432 rta->rta_len = size;
433 memcpy(RTA_DATA(rta), data, attrlen);
434 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
435 }
436
437 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
438 {
439 struct sock *rtnl = net->rtnl;
440 int err = 0;
441
442 NETLINK_CB(skb).dst_group = group;
443 if (echo)
444 atomic_inc(&skb->users);
445 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
446 if (echo)
447 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
448 return err;
449 }
450
451 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
452 {
453 struct sock *rtnl = net->rtnl;
454
455 return nlmsg_unicast(rtnl, skb, pid);
456 }
457
458 int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
459 struct nlmsghdr *nlh, gfp_t flags)
460 {
461 struct sock *rtnl = net->rtnl;
462 int report = 0;
463
464 if (nlh)
465 report = nlmsg_report(nlh);
466
467 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
468 }
469
470 void rtnl_set_sk_err(struct net *net, u32 group, int error)
471 {
472 struct sock *rtnl = net->rtnl;
473
474 netlink_set_err(rtnl, 0, group, error);
475 }
476
477 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
478 {
479 struct nlattr *mx;
480 int i, valid = 0;
481
482 mx = nla_nest_start(skb, RTA_METRICS);
483 if (mx == NULL)
484 return -ENOBUFS;
485
486 for (i = 0; i < RTAX_MAX; i++) {
487 if (metrics[i]) {
488 valid++;
489 NLA_PUT_U32(skb, i+1, metrics[i]);
490 }
491 }
492
493 if (!valid) {
494 nla_nest_cancel(skb, mx);
495 return 0;
496 }
497
498 return nla_nest_end(skb, mx);
499
500 nla_put_failure:
501 return nla_nest_cancel(skb, mx);
502 }
503
504 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
505 u32 ts, u32 tsage, long expires, u32 error)
506 {
507 struct rta_cacheinfo ci = {
508 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
509 .rta_used = dst->__use,
510 .rta_clntref = atomic_read(&(dst->__refcnt)),
511 .rta_error = error,
512 .rta_id = id,
513 .rta_ts = ts,
514 .rta_tsage = tsage,
515 };
516
517 if (expires)
518 ci.rta_expires = jiffies_to_clock_t(expires);
519
520 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
521 }
522
523 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
524
525 static void set_operstate(struct net_device *dev, unsigned char transition)
526 {
527 unsigned char operstate = dev->operstate;
528
529 switch(transition) {
530 case IF_OPER_UP:
531 if ((operstate == IF_OPER_DORMANT ||
532 operstate == IF_OPER_UNKNOWN) &&
533 !netif_dormant(dev))
534 operstate = IF_OPER_UP;
535 break;
536
537 case IF_OPER_DORMANT:
538 if (operstate == IF_OPER_UP ||
539 operstate == IF_OPER_UNKNOWN)
540 operstate = IF_OPER_DORMANT;
541 break;
542 }
543
544 if (dev->operstate != operstate) {
545 write_lock_bh(&dev_base_lock);
546 dev->operstate = operstate;
547 write_unlock_bh(&dev_base_lock);
548 netdev_state_change(dev);
549 }
550 }
551
552 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
553 struct net_device_stats *b)
554 {
555 a->rx_packets = b->rx_packets;
556 a->tx_packets = b->tx_packets;
557 a->rx_bytes = b->rx_bytes;
558 a->tx_bytes = b->tx_bytes;
559 a->rx_errors = b->rx_errors;
560 a->tx_errors = b->tx_errors;
561 a->rx_dropped = b->rx_dropped;
562 a->tx_dropped = b->tx_dropped;
563
564 a->multicast = b->multicast;
565 a->collisions = b->collisions;
566
567 a->rx_length_errors = b->rx_length_errors;
568 a->rx_over_errors = b->rx_over_errors;
569 a->rx_crc_errors = b->rx_crc_errors;
570 a->rx_frame_errors = b->rx_frame_errors;
571 a->rx_fifo_errors = b->rx_fifo_errors;
572 a->rx_missed_errors = b->rx_missed_errors;
573
574 a->tx_aborted_errors = b->tx_aborted_errors;
575 a->tx_carrier_errors = b->tx_carrier_errors;
576 a->tx_fifo_errors = b->tx_fifo_errors;
577 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
578 a->tx_window_errors = b->tx_window_errors;
579
580 a->rx_compressed = b->rx_compressed;
581 a->tx_compressed = b->tx_compressed;
582 };
583
584 static inline size_t if_nlmsg_size(const struct net_device *dev)
585 {
586 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
587 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
588 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
589 + nla_total_size(sizeof(struct rtnl_link_ifmap))
590 + nla_total_size(sizeof(struct rtnl_link_stats))
591 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
592 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
593 + nla_total_size(4) /* IFLA_TXQLEN */
594 + nla_total_size(4) /* IFLA_WEIGHT */
595 + nla_total_size(4) /* IFLA_MTU */
596 + nla_total_size(4) /* IFLA_LINK */
597 + nla_total_size(4) /* IFLA_MASTER */
598 + nla_total_size(1) /* IFLA_OPERSTATE */
599 + nla_total_size(1) /* IFLA_LINKMODE */
600 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
601 }
602
603 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
604 int type, u32 pid, u32 seq, u32 change,
605 unsigned int flags)
606 {
607 struct ifinfomsg *ifm;
608 struct nlmsghdr *nlh;
609
610 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
611 if (nlh == NULL)
612 return -EMSGSIZE;
613
614 ifm = nlmsg_data(nlh);
615 ifm->ifi_family = AF_UNSPEC;
616 ifm->__ifi_pad = 0;
617 ifm->ifi_type = dev->type;
618 ifm->ifi_index = dev->ifindex;
619 ifm->ifi_flags = dev_get_flags(dev);
620 ifm->ifi_change = change;
621
622 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
623 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
624 NLA_PUT_U8(skb, IFLA_OPERSTATE,
625 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
626 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
627 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
628
629 if (dev->ifindex != dev->iflink)
630 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
631
632 if (dev->master)
633 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
634
635 if (dev->qdisc_sleeping)
636 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
637
638 if (1) {
639 struct rtnl_link_ifmap map = {
640 .mem_start = dev->mem_start,
641 .mem_end = dev->mem_end,
642 .base_addr = dev->base_addr,
643 .irq = dev->irq,
644 .dma = dev->dma,
645 .port = dev->if_port,
646 };
647 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
648 }
649
650 if (dev->addr_len) {
651 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
652 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
653 }
654
655 if (dev->get_stats) {
656 struct net_device_stats *stats = dev->get_stats(dev);
657 if (stats) {
658 struct nlattr *attr;
659
660 attr = nla_reserve(skb, IFLA_STATS,
661 sizeof(struct rtnl_link_stats));
662 if (attr == NULL)
663 goto nla_put_failure;
664
665 copy_rtnl_link_stats(nla_data(attr), stats);
666 }
667 }
668
669 if (dev->rtnl_link_ops) {
670 if (rtnl_link_fill(skb, dev) < 0)
671 goto nla_put_failure;
672 }
673
674 return nlmsg_end(skb, nlh);
675
676 nla_put_failure:
677 nlmsg_cancel(skb, nlh);
678 return -EMSGSIZE;
679 }
680
681 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
682 {
683 struct net *net = sock_net(skb->sk);
684 int idx;
685 int s_idx = cb->args[0];
686 struct net_device *dev;
687
688 idx = 0;
689 for_each_netdev(net, dev) {
690 if (idx < s_idx)
691 goto cont;
692 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
693 NETLINK_CB(cb->skb).pid,
694 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
695 break;
696 cont:
697 idx++;
698 }
699 cb->args[0] = idx;
700
701 return skb->len;
702 }
703
704 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
705 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
706 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
707 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
708 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
709 [IFLA_MTU] = { .type = NLA_U32 },
710 [IFLA_LINK] = { .type = NLA_U32 },
711 [IFLA_TXQLEN] = { .type = NLA_U32 },
712 [IFLA_WEIGHT] = { .type = NLA_U32 },
713 [IFLA_OPERSTATE] = { .type = NLA_U8 },
714 [IFLA_LINKMODE] = { .type = NLA_U8 },
715 [IFLA_LINKINFO] = { .type = NLA_NESTED },
716 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
717 };
718
719 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
720 [IFLA_INFO_KIND] = { .type = NLA_STRING },
721 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
722 };
723
724 static struct net *get_net_ns_by_pid(pid_t pid)
725 {
726 struct task_struct *tsk;
727 struct net *net;
728
729 /* Lookup the network namespace */
730 net = ERR_PTR(-ESRCH);
731 rcu_read_lock();
732 tsk = find_task_by_vpid(pid);
733 if (tsk) {
734 struct nsproxy *nsproxy;
735 nsproxy = task_nsproxy(tsk);
736 if (nsproxy)
737 net = get_net(nsproxy->net_ns);
738 }
739 rcu_read_unlock();
740 return net;
741 }
742
743 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
744 {
745 if (dev) {
746 if (tb[IFLA_ADDRESS] &&
747 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
748 return -EINVAL;
749
750 if (tb[IFLA_BROADCAST] &&
751 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
752 return -EINVAL;
753 }
754
755 return 0;
756 }
757
758 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
759 struct nlattr **tb, char *ifname, int modified)
760 {
761 int send_addr_notify = 0;
762 int err;
763
764 if (tb[IFLA_NET_NS_PID]) {
765 struct net *net;
766 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
767 if (IS_ERR(net)) {
768 err = PTR_ERR(net);
769 goto errout;
770 }
771 err = dev_change_net_namespace(dev, net, ifname);
772 put_net(net);
773 if (err)
774 goto errout;
775 modified = 1;
776 }
777
778 if (tb[IFLA_MAP]) {
779 struct rtnl_link_ifmap *u_map;
780 struct ifmap k_map;
781
782 if (!dev->set_config) {
783 err = -EOPNOTSUPP;
784 goto errout;
785 }
786
787 if (!netif_device_present(dev)) {
788 err = -ENODEV;
789 goto errout;
790 }
791
792 u_map = nla_data(tb[IFLA_MAP]);
793 k_map.mem_start = (unsigned long) u_map->mem_start;
794 k_map.mem_end = (unsigned long) u_map->mem_end;
795 k_map.base_addr = (unsigned short) u_map->base_addr;
796 k_map.irq = (unsigned char) u_map->irq;
797 k_map.dma = (unsigned char) u_map->dma;
798 k_map.port = (unsigned char) u_map->port;
799
800 err = dev->set_config(dev, &k_map);
801 if (err < 0)
802 goto errout;
803
804 modified = 1;
805 }
806
807 if (tb[IFLA_ADDRESS]) {
808 struct sockaddr *sa;
809 int len;
810
811 if (!dev->set_mac_address) {
812 err = -EOPNOTSUPP;
813 goto errout;
814 }
815
816 if (!netif_device_present(dev)) {
817 err = -ENODEV;
818 goto errout;
819 }
820
821 len = sizeof(sa_family_t) + dev->addr_len;
822 sa = kmalloc(len, GFP_KERNEL);
823 if (!sa) {
824 err = -ENOMEM;
825 goto errout;
826 }
827 sa->sa_family = dev->type;
828 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
829 dev->addr_len);
830 err = dev->set_mac_address(dev, sa);
831 kfree(sa);
832 if (err)
833 goto errout;
834 send_addr_notify = 1;
835 modified = 1;
836 }
837
838 if (tb[IFLA_MTU]) {
839 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
840 if (err < 0)
841 goto errout;
842 modified = 1;
843 }
844
845 /*
846 * Interface selected by interface index but interface
847 * name provided implies that a name change has been
848 * requested.
849 */
850 if (ifm->ifi_index > 0 && ifname[0]) {
851 err = dev_change_name(dev, ifname);
852 if (err < 0)
853 goto errout;
854 modified = 1;
855 }
856
857 if (tb[IFLA_BROADCAST]) {
858 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
859 send_addr_notify = 1;
860 }
861
862 if (ifm->ifi_flags || ifm->ifi_change) {
863 unsigned int flags = ifm->ifi_flags;
864
865 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
866 if (ifm->ifi_change)
867 flags = (flags & ifm->ifi_change) |
868 (dev->flags & ~ifm->ifi_change);
869 dev_change_flags(dev, flags);
870 }
871
872 if (tb[IFLA_TXQLEN])
873 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
874
875 if (tb[IFLA_OPERSTATE])
876 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
877
878 if (tb[IFLA_LINKMODE]) {
879 write_lock_bh(&dev_base_lock);
880 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
881 write_unlock_bh(&dev_base_lock);
882 }
883
884 err = 0;
885
886 errout:
887 if (err < 0 && modified && net_ratelimit())
888 printk(KERN_WARNING "A link change request failed with "
889 "some changes comitted already. Interface %s may "
890 "have been left with an inconsistent configuration, "
891 "please check.\n", dev->name);
892
893 if (send_addr_notify)
894 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
895 return err;
896 }
897
898 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
899 {
900 struct net *net = sock_net(skb->sk);
901 struct ifinfomsg *ifm;
902 struct net_device *dev;
903 int err;
904 struct nlattr *tb[IFLA_MAX+1];
905 char ifname[IFNAMSIZ];
906
907 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
908 if (err < 0)
909 goto errout;
910
911 if (tb[IFLA_IFNAME])
912 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
913 else
914 ifname[0] = '\0';
915
916 err = -EINVAL;
917 ifm = nlmsg_data(nlh);
918 if (ifm->ifi_index > 0)
919 dev = dev_get_by_index(net, ifm->ifi_index);
920 else if (tb[IFLA_IFNAME])
921 dev = dev_get_by_name(net, ifname);
922 else
923 goto errout;
924
925 if (dev == NULL) {
926 err = -ENODEV;
927 goto errout;
928 }
929
930 if ((err = validate_linkmsg(dev, tb)) < 0)
931 goto errout_dev;
932
933 err = do_setlink(dev, ifm, tb, ifname, 0);
934 errout_dev:
935 dev_put(dev);
936 errout:
937 return err;
938 }
939
940 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
941 {
942 struct net *net = sock_net(skb->sk);
943 const struct rtnl_link_ops *ops;
944 struct net_device *dev;
945 struct ifinfomsg *ifm;
946 char ifname[IFNAMSIZ];
947 struct nlattr *tb[IFLA_MAX+1];
948 int err;
949
950 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
951 if (err < 0)
952 return err;
953
954 if (tb[IFLA_IFNAME])
955 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
956
957 ifm = nlmsg_data(nlh);
958 if (ifm->ifi_index > 0)
959 dev = __dev_get_by_index(net, ifm->ifi_index);
960 else if (tb[IFLA_IFNAME])
961 dev = __dev_get_by_name(net, ifname);
962 else
963 return -EINVAL;
964
965 if (!dev)
966 return -ENODEV;
967
968 ops = dev->rtnl_link_ops;
969 if (!ops)
970 return -EOPNOTSUPP;
971
972 ops->dellink(dev);
973 return 0;
974 }
975
976 struct net_device *rtnl_create_link(struct net *net, char *ifname,
977 const struct rtnl_link_ops *ops, struct nlattr *tb[])
978 {
979 int err;
980 struct net_device *dev;
981
982 err = -ENOMEM;
983 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
984 if (!dev)
985 goto err;
986
987 if (strchr(dev->name, '%')) {
988 err = dev_alloc_name(dev, dev->name);
989 if (err < 0)
990 goto err_free;
991 }
992
993 dev_net_set(dev, net);
994 dev->rtnl_link_ops = ops;
995
996 if (tb[IFLA_MTU])
997 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
998 if (tb[IFLA_ADDRESS])
999 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1000 nla_len(tb[IFLA_ADDRESS]));
1001 if (tb[IFLA_BROADCAST])
1002 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1003 nla_len(tb[IFLA_BROADCAST]));
1004 if (tb[IFLA_TXQLEN])
1005 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1006 if (tb[IFLA_OPERSTATE])
1007 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1008 if (tb[IFLA_LINKMODE])
1009 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1010
1011 return dev;
1012
1013 err_free:
1014 free_netdev(dev);
1015 err:
1016 return ERR_PTR(err);
1017 }
1018
1019 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1020 {
1021 struct net *net = sock_net(skb->sk);
1022 const struct rtnl_link_ops *ops;
1023 struct net_device *dev;
1024 struct ifinfomsg *ifm;
1025 char kind[MODULE_NAME_LEN];
1026 char ifname[IFNAMSIZ];
1027 struct nlattr *tb[IFLA_MAX+1];
1028 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1029 int err;
1030
1031 #ifdef CONFIG_KMOD
1032 replay:
1033 #endif
1034 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1035 if (err < 0)
1036 return err;
1037
1038 if (tb[IFLA_IFNAME])
1039 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1040 else
1041 ifname[0] = '\0';
1042
1043 ifm = nlmsg_data(nlh);
1044 if (ifm->ifi_index > 0)
1045 dev = __dev_get_by_index(net, ifm->ifi_index);
1046 else if (ifname[0])
1047 dev = __dev_get_by_name(net, ifname);
1048 else
1049 dev = NULL;
1050
1051 if ((err = validate_linkmsg(dev, tb)) < 0)
1052 return err;
1053
1054 if (tb[IFLA_LINKINFO]) {
1055 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1056 tb[IFLA_LINKINFO], ifla_info_policy);
1057 if (err < 0)
1058 return err;
1059 } else
1060 memset(linkinfo, 0, sizeof(linkinfo));
1061
1062 if (linkinfo[IFLA_INFO_KIND]) {
1063 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1064 ops = rtnl_link_ops_get(kind);
1065 } else {
1066 kind[0] = '\0';
1067 ops = NULL;
1068 }
1069
1070 if (1) {
1071 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1072
1073 if (ops) {
1074 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1075 err = nla_parse_nested(attr, ops->maxtype,
1076 linkinfo[IFLA_INFO_DATA],
1077 ops->policy);
1078 if (err < 0)
1079 return err;
1080 data = attr;
1081 }
1082 if (ops->validate) {
1083 err = ops->validate(tb, data);
1084 if (err < 0)
1085 return err;
1086 }
1087 }
1088
1089 if (dev) {
1090 int modified = 0;
1091
1092 if (nlh->nlmsg_flags & NLM_F_EXCL)
1093 return -EEXIST;
1094 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1095 return -EOPNOTSUPP;
1096
1097 if (linkinfo[IFLA_INFO_DATA]) {
1098 if (!ops || ops != dev->rtnl_link_ops ||
1099 !ops->changelink)
1100 return -EOPNOTSUPP;
1101
1102 err = ops->changelink(dev, tb, data);
1103 if (err < 0)
1104 return err;
1105 modified = 1;
1106 }
1107
1108 return do_setlink(dev, ifm, tb, ifname, modified);
1109 }
1110
1111 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1112 return -ENODEV;
1113
1114 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1115 return -EOPNOTSUPP;
1116 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1117 return -EOPNOTSUPP;
1118
1119 if (!ops) {
1120 #ifdef CONFIG_KMOD
1121 if (kind[0]) {
1122 __rtnl_unlock();
1123 request_module("rtnl-link-%s", kind);
1124 rtnl_lock();
1125 ops = rtnl_link_ops_get(kind);
1126 if (ops)
1127 goto replay;
1128 }
1129 #endif
1130 return -EOPNOTSUPP;
1131 }
1132
1133 if (!ifname[0])
1134 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1135
1136 dev = rtnl_create_link(net, ifname, ops, tb);
1137
1138 if (IS_ERR(dev))
1139 err = PTR_ERR(dev);
1140 else if (ops->newlink)
1141 err = ops->newlink(dev, tb, data);
1142 else
1143 err = register_netdevice(dev);
1144
1145 if (err < 0 && !IS_ERR(dev))
1146 free_netdev(dev);
1147 return err;
1148 }
1149 }
1150
1151 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1152 {
1153 struct net *net = sock_net(skb->sk);
1154 struct ifinfomsg *ifm;
1155 struct nlattr *tb[IFLA_MAX+1];
1156 struct net_device *dev = NULL;
1157 struct sk_buff *nskb;
1158 int err;
1159
1160 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1161 if (err < 0)
1162 return err;
1163
1164 ifm = nlmsg_data(nlh);
1165 if (ifm->ifi_index > 0) {
1166 dev = dev_get_by_index(net, ifm->ifi_index);
1167 if (dev == NULL)
1168 return -ENODEV;
1169 } else
1170 return -EINVAL;
1171
1172 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1173 if (nskb == NULL) {
1174 err = -ENOBUFS;
1175 goto errout;
1176 }
1177
1178 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1179 nlh->nlmsg_seq, 0, 0);
1180 if (err < 0) {
1181 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1182 WARN_ON(err == -EMSGSIZE);
1183 kfree_skb(nskb);
1184 goto errout;
1185 }
1186 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1187 errout:
1188 dev_put(dev);
1189
1190 return err;
1191 }
1192
1193 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1194 {
1195 int idx;
1196 int s_idx = cb->family;
1197
1198 if (s_idx == 0)
1199 s_idx = 1;
1200 for (idx=1; idx<NPROTO; idx++) {
1201 int type = cb->nlh->nlmsg_type-RTM_BASE;
1202 if (idx < s_idx || idx == PF_PACKET)
1203 continue;
1204 if (rtnl_msg_handlers[idx] == NULL ||
1205 rtnl_msg_handlers[idx][type].dumpit == NULL)
1206 continue;
1207 if (idx > s_idx)
1208 memset(&cb->args[0], 0, sizeof(cb->args));
1209 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1210 break;
1211 }
1212 cb->family = idx;
1213
1214 return skb->len;
1215 }
1216
1217 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1218 {
1219 struct net *net = dev_net(dev);
1220 struct sk_buff *skb;
1221 int err = -ENOBUFS;
1222
1223 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1224 if (skb == NULL)
1225 goto errout;
1226
1227 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1228 if (err < 0) {
1229 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1230 WARN_ON(err == -EMSGSIZE);
1231 kfree_skb(skb);
1232 goto errout;
1233 }
1234 err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1235 errout:
1236 if (err < 0)
1237 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1238 }
1239
1240 /* Protected by RTNL sempahore. */
1241 static struct rtattr **rta_buf;
1242 static int rtattr_max;
1243
1244 /* Process one rtnetlink message. */
1245
1246 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1247 {
1248 struct net *net = sock_net(skb->sk);
1249 rtnl_doit_func doit;
1250 int sz_idx, kind;
1251 int min_len;
1252 int family;
1253 int type;
1254 int err;
1255
1256 type = nlh->nlmsg_type;
1257 if (type > RTM_MAX)
1258 return -EOPNOTSUPP;
1259
1260 type -= RTM_BASE;
1261
1262 /* All the messages must have at least 1 byte length */
1263 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1264 return 0;
1265
1266 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1267 if (family >= NPROTO)
1268 return -EAFNOSUPPORT;
1269
1270 sz_idx = type>>2;
1271 kind = type&3;
1272
1273 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1274 return -EPERM;
1275
1276 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1277 struct sock *rtnl;
1278 rtnl_dumpit_func dumpit;
1279
1280 dumpit = rtnl_get_dumpit(family, type);
1281 if (dumpit == NULL)
1282 return -EOPNOTSUPP;
1283
1284 __rtnl_unlock();
1285 rtnl = net->rtnl;
1286 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1287 rtnl_lock();
1288 return err;
1289 }
1290
1291 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1292
1293 min_len = rtm_min[sz_idx];
1294 if (nlh->nlmsg_len < min_len)
1295 return -EINVAL;
1296
1297 if (nlh->nlmsg_len > min_len) {
1298 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1299 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1300
1301 while (RTA_OK(attr, attrlen)) {
1302 unsigned flavor = attr->rta_type;
1303 if (flavor) {
1304 if (flavor > rta_max[sz_idx])
1305 return -EINVAL;
1306 rta_buf[flavor-1] = attr;
1307 }
1308 attr = RTA_NEXT(attr, attrlen);
1309 }
1310 }
1311
1312 doit = rtnl_get_doit(family, type);
1313 if (doit == NULL)
1314 return -EOPNOTSUPP;
1315
1316 return doit(skb, nlh, (void *)&rta_buf[0]);
1317 }
1318
1319 static void rtnetlink_rcv(struct sk_buff *skb)
1320 {
1321 rtnl_lock();
1322 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1323 rtnl_unlock();
1324 }
1325
1326 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1327 {
1328 struct net_device *dev = ptr;
1329
1330 switch (event) {
1331 case NETDEV_UNREGISTER:
1332 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1333 break;
1334 case NETDEV_REGISTER:
1335 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1336 break;
1337 case NETDEV_UP:
1338 case NETDEV_DOWN:
1339 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1340 break;
1341 case NETDEV_CHANGE:
1342 case NETDEV_GOING_DOWN:
1343 break;
1344 default:
1345 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1346 break;
1347 }
1348 return NOTIFY_DONE;
1349 }
1350
1351 static struct notifier_block rtnetlink_dev_notifier = {
1352 .notifier_call = rtnetlink_event,
1353 };
1354
1355
1356 static int rtnetlink_net_init(struct net *net)
1357 {
1358 struct sock *sk;
1359 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1360 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1361 if (!sk)
1362 return -ENOMEM;
1363 net->rtnl = sk;
1364 return 0;
1365 }
1366
1367 static void rtnetlink_net_exit(struct net *net)
1368 {
1369 netlink_kernel_release(net->rtnl);
1370 net->rtnl = NULL;
1371 }
1372
1373 static struct pernet_operations rtnetlink_net_ops = {
1374 .init = rtnetlink_net_init,
1375 .exit = rtnetlink_net_exit,
1376 };
1377
1378 void __init rtnetlink_init(void)
1379 {
1380 int i;
1381
1382 rtattr_max = 0;
1383 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1384 if (rta_max[i] > rtattr_max)
1385 rtattr_max = rta_max[i];
1386 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1387 if (!rta_buf)
1388 panic("rtnetlink_init: cannot allocate rta_buf\n");
1389
1390 if (register_pernet_subsys(&rtnetlink_net_ops))
1391 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1392
1393 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1394 register_netdevice_notifier(&rtnetlink_dev_notifier);
1395
1396 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1397 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1398 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1399 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1400
1401 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1402 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1403 }
1404
1405 EXPORT_SYMBOL(__rta_fill);
1406 EXPORT_SYMBOL(rtnetlink_put_metrics);
1407 EXPORT_SYMBOL(rtnl_lock);
1408 EXPORT_SYMBOL(rtnl_trylock);
1409 EXPORT_SYMBOL(rtnl_unlock);
1410 EXPORT_SYMBOL(rtnl_is_locked);
1411 EXPORT_SYMBOL(rtnl_unicast);
1412 EXPORT_SYMBOL(rtnl_notify);
1413 EXPORT_SYMBOL(rtnl_set_sk_err);
1414 EXPORT_SYMBOL(rtnl_create_link);
1415 EXPORT_SYMBOL(ifla_policy);
Linus' kernel tree