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 /* This fellow will unlock it for us. */
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 void 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 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 nla_nest_cancel(skb, mx);
502 return -EMSGSIZE;
503 }
504
505 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
506 u32 ts, u32 tsage, long expires, u32 error)
507 {
508 struct rta_cacheinfo ci = {
509 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
510 .rta_used = dst->__use,
511 .rta_clntref = atomic_read(&(dst->__refcnt)),
512 .rta_error = error,
513 .rta_id = id,
514 .rta_ts = ts,
515 .rta_tsage = tsage,
516 };
517
518 if (expires)
519 ci.rta_expires = jiffies_to_clock_t(expires);
520
521 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
522 }
523
524 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
525
526 static void set_operstate(struct net_device *dev, unsigned char transition)
527 {
528 unsigned char operstate = dev->operstate;
529
530 switch(transition) {
531 case IF_OPER_UP:
532 if ((operstate == IF_OPER_DORMANT ||
533 operstate == IF_OPER_UNKNOWN) &&
534 !netif_dormant(dev))
535 operstate = IF_OPER_UP;
536 break;
537
538 case IF_OPER_DORMANT:
539 if (operstate == IF_OPER_UP ||
540 operstate == IF_OPER_UNKNOWN)
541 operstate = IF_OPER_DORMANT;
542 break;
543 }
544
545 if (dev->operstate != operstate) {
546 write_lock_bh(&dev_base_lock);
547 dev->operstate = operstate;
548 write_unlock_bh(&dev_base_lock);
549 netdev_state_change(dev);
550 }
551 }
552
553 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
554 const struct net_device_stats *b)
555 {
556 a->rx_packets = b->rx_packets;
557 a->tx_packets = b->tx_packets;
558 a->rx_bytes = b->rx_bytes;
559 a->tx_bytes = b->tx_bytes;
560 a->rx_errors = b->rx_errors;
561 a->tx_errors = b->tx_errors;
562 a->rx_dropped = b->rx_dropped;
563 a->tx_dropped = b->tx_dropped;
564
565 a->multicast = b->multicast;
566 a->collisions = b->collisions;
567
568 a->rx_length_errors = b->rx_length_errors;
569 a->rx_over_errors = b->rx_over_errors;
570 a->rx_crc_errors = b->rx_crc_errors;
571 a->rx_frame_errors = b->rx_frame_errors;
572 a->rx_fifo_errors = b->rx_fifo_errors;
573 a->rx_missed_errors = b->rx_missed_errors;
574
575 a->tx_aborted_errors = b->tx_aborted_errors;
576 a->tx_carrier_errors = b->tx_carrier_errors;
577 a->tx_fifo_errors = b->tx_fifo_errors;
578 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
579 a->tx_window_errors = b->tx_window_errors;
580
581 a->rx_compressed = b->rx_compressed;
582 a->tx_compressed = b->tx_compressed;
583 };
584
585 static inline size_t if_nlmsg_size(const struct net_device *dev)
586 {
587 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
588 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
589 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
590 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
591 + nla_total_size(sizeof(struct rtnl_link_ifmap))
592 + nla_total_size(sizeof(struct rtnl_link_stats))
593 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
594 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
595 + nla_total_size(4) /* IFLA_TXQLEN */
596 + nla_total_size(4) /* IFLA_WEIGHT */
597 + nla_total_size(4) /* IFLA_MTU */
598 + nla_total_size(4) /* IFLA_LINK */
599 + nla_total_size(4) /* IFLA_MASTER */
600 + nla_total_size(1) /* IFLA_OPERSTATE */
601 + nla_total_size(1) /* IFLA_LINKMODE */
602 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
603 }
604
605 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
606 int type, u32 pid, u32 seq, u32 change,
607 unsigned int flags)
608 {
609 struct netdev_queue *txq;
610 struct ifinfomsg *ifm;
611 struct nlmsghdr *nlh;
612 const struct net_device_stats *stats;
613 struct nlattr *attr;
614
615 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
616 if (nlh == NULL)
617 return -EMSGSIZE;
618
619 ifm = nlmsg_data(nlh);
620 ifm->ifi_family = AF_UNSPEC;
621 ifm->__ifi_pad = 0;
622 ifm->ifi_type = dev->type;
623 ifm->ifi_index = dev->ifindex;
624 ifm->ifi_flags = dev_get_flags(dev);
625 ifm->ifi_change = change;
626
627 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
628 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
629 NLA_PUT_U8(skb, IFLA_OPERSTATE,
630 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
631 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
632 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
633
634 if (dev->ifindex != dev->iflink)
635 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
636
637 if (dev->master)
638 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
639
640 txq = netdev_get_tx_queue(dev, 0);
641 if (txq->qdisc_sleeping)
642 NLA_PUT_STRING(skb, IFLA_QDISC, txq->qdisc_sleeping->ops->id);
643
644 if (dev->ifalias)
645 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
646
647 if (1) {
648 struct rtnl_link_ifmap map = {
649 .mem_start = dev->mem_start,
650 .mem_end = dev->mem_end,
651 .base_addr = dev->base_addr,
652 .irq = dev->irq,
653 .dma = dev->dma,
654 .port = dev->if_port,
655 };
656 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
657 }
658
659 if (dev->addr_len) {
660 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
661 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
662 }
663
664 attr = nla_reserve(skb, IFLA_STATS,
665 sizeof(struct rtnl_link_stats));
666 if (attr == NULL)
667 goto nla_put_failure;
668
669 stats = dev_get_stats(dev);
670 copy_rtnl_link_stats(nla_data(attr), stats);
671
672 if (dev->rtnl_link_ops) {
673 if (rtnl_link_fill(skb, dev) < 0)
674 goto nla_put_failure;
675 }
676
677 return nlmsg_end(skb, nlh);
678
679 nla_put_failure:
680 nlmsg_cancel(skb, nlh);
681 return -EMSGSIZE;
682 }
683
684 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
685 {
686 struct net *net = sock_net(skb->sk);
687 int idx;
688 int s_idx = cb->args[0];
689 struct net_device *dev;
690
691 idx = 0;
692 for_each_netdev(net, dev) {
693 if (idx < s_idx)
694 goto cont;
695 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
696 NETLINK_CB(cb->skb).pid,
697 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
698 break;
699 cont:
700 idx++;
701 }
702 cb->args[0] = idx;
703
704 return skb->len;
705 }
706
707 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
708 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
709 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
710 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
711 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
712 [IFLA_MTU] = { .type = NLA_U32 },
713 [IFLA_LINK] = { .type = NLA_U32 },
714 [IFLA_TXQLEN] = { .type = NLA_U32 },
715 [IFLA_WEIGHT] = { .type = NLA_U32 },
716 [IFLA_OPERSTATE] = { .type = NLA_U8 },
717 [IFLA_LINKMODE] = { .type = NLA_U8 },
718 [IFLA_LINKINFO] = { .type = NLA_NESTED },
719 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
720 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
721 };
722
723 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
724 [IFLA_INFO_KIND] = { .type = NLA_STRING },
725 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
726 };
727
728 static struct net *get_net_ns_by_pid(pid_t pid)
729 {
730 struct task_struct *tsk;
731 struct net *net;
732
733 /* Lookup the network namespace */
734 net = ERR_PTR(-ESRCH);
735 rcu_read_lock();
736 tsk = find_task_by_vpid(pid);
737 if (tsk) {
738 struct nsproxy *nsproxy;
739 nsproxy = task_nsproxy(tsk);
740 if (nsproxy)
741 net = get_net(nsproxy->net_ns);
742 }
743 rcu_read_unlock();
744 return net;
745 }
746
747 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
748 {
749 if (dev) {
750 if (tb[IFLA_ADDRESS] &&
751 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
752 return -EINVAL;
753
754 if (tb[IFLA_BROADCAST] &&
755 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
756 return -EINVAL;
757 }
758
759 return 0;
760 }
761
762 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
763 struct nlattr **tb, char *ifname, int modified)
764 {
765 const struct net_device_ops *ops = dev->netdev_ops;
766 int send_addr_notify = 0;
767 int err;
768
769 if (tb[IFLA_NET_NS_PID]) {
770 struct net *net;
771 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
772 if (IS_ERR(net)) {
773 err = PTR_ERR(net);
774 goto errout;
775 }
776 err = dev_change_net_namespace(dev, net, ifname);
777 put_net(net);
778 if (err)
779 goto errout;
780 modified = 1;
781 }
782
783 if (tb[IFLA_MAP]) {
784 struct rtnl_link_ifmap *u_map;
785 struct ifmap k_map;
786
787 if (!ops->ndo_set_config) {
788 err = -EOPNOTSUPP;
789 goto errout;
790 }
791
792 if (!netif_device_present(dev)) {
793 err = -ENODEV;
794 goto errout;
795 }
796
797 u_map = nla_data(tb[IFLA_MAP]);
798 k_map.mem_start = (unsigned long) u_map->mem_start;
799 k_map.mem_end = (unsigned long) u_map->mem_end;
800 k_map.base_addr = (unsigned short) u_map->base_addr;
801 k_map.irq = (unsigned char) u_map->irq;
802 k_map.dma = (unsigned char) u_map->dma;
803 k_map.port = (unsigned char) u_map->port;
804
805 err = ops->ndo_set_config(dev, &k_map);
806 if (err < 0)
807 goto errout;
808
809 modified = 1;
810 }
811
812 if (tb[IFLA_ADDRESS]) {
813 struct sockaddr *sa;
814 int len;
815
816 if (!ops->ndo_set_mac_address) {
817 err = -EOPNOTSUPP;
818 goto errout;
819 }
820
821 if (!netif_device_present(dev)) {
822 err = -ENODEV;
823 goto errout;
824 }
825
826 len = sizeof(sa_family_t) + dev->addr_len;
827 sa = kmalloc(len, GFP_KERNEL);
828 if (!sa) {
829 err = -ENOMEM;
830 goto errout;
831 }
832 sa->sa_family = dev->type;
833 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
834 dev->addr_len);
835 err = ops->ndo_set_mac_address(dev, sa);
836 kfree(sa);
837 if (err)
838 goto errout;
839 send_addr_notify = 1;
840 modified = 1;
841 }
842
843 if (tb[IFLA_MTU]) {
844 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
845 if (err < 0)
846 goto errout;
847 modified = 1;
848 }
849
850 /*
851 * Interface selected by interface index but interface
852 * name provided implies that a name change has been
853 * requested.
854 */
855 if (ifm->ifi_index > 0 && ifname[0]) {
856 err = dev_change_name(dev, ifname);
857 if (err < 0)
858 goto errout;
859 modified = 1;
860 }
861
862 if (tb[IFLA_IFALIAS]) {
863 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
864 nla_len(tb[IFLA_IFALIAS]));
865 if (err < 0)
866 goto errout;
867 modified = 1;
868 }
869
870 if (tb[IFLA_BROADCAST]) {
871 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
872 send_addr_notify = 1;
873 }
874
875 if (ifm->ifi_flags || ifm->ifi_change) {
876 unsigned int flags = ifm->ifi_flags;
877
878 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
879 if (ifm->ifi_change)
880 flags = (flags & ifm->ifi_change) |
881 (dev->flags & ~ifm->ifi_change);
882 err = dev_change_flags(dev, flags);
883 if (err < 0)
884 goto errout;
885 }
886
887 if (tb[IFLA_TXQLEN])
888 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
889
890 if (tb[IFLA_OPERSTATE])
891 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
892
893 if (tb[IFLA_LINKMODE]) {
894 write_lock_bh(&dev_base_lock);
895 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
896 write_unlock_bh(&dev_base_lock);
897 }
898
899 err = 0;
900
901 errout:
902 if (err < 0 && modified && net_ratelimit())
903 printk(KERN_WARNING "A link change request failed with "
904 "some changes comitted already. Interface %s may "
905 "have been left with an inconsistent configuration, "
906 "please check.\n", dev->name);
907
908 if (send_addr_notify)
909 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
910 return err;
911 }
912
913 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
914 {
915 struct net *net = sock_net(skb->sk);
916 struct ifinfomsg *ifm;
917 struct net_device *dev;
918 int err;
919 struct nlattr *tb[IFLA_MAX+1];
920 char ifname[IFNAMSIZ];
921
922 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
923 if (err < 0)
924 goto errout;
925
926 if (tb[IFLA_IFNAME])
927 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
928 else
929 ifname[0] = '\0';
930
931 err = -EINVAL;
932 ifm = nlmsg_data(nlh);
933 if (ifm->ifi_index > 0)
934 dev = dev_get_by_index(net, ifm->ifi_index);
935 else if (tb[IFLA_IFNAME])
936 dev = dev_get_by_name(net, ifname);
937 else
938 goto errout;
939
940 if (dev == NULL) {
941 err = -ENODEV;
942 goto errout;
943 }
944
945 if ((err = validate_linkmsg(dev, tb)) < 0)
946 goto errout_dev;
947
948 err = do_setlink(dev, ifm, tb, ifname, 0);
949 errout_dev:
950 dev_put(dev);
951 errout:
952 return err;
953 }
954
955 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
956 {
957 struct net *net = sock_net(skb->sk);
958 const struct rtnl_link_ops *ops;
959 struct net_device *dev;
960 struct ifinfomsg *ifm;
961 char ifname[IFNAMSIZ];
962 struct nlattr *tb[IFLA_MAX+1];
963 int err;
964
965 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
966 if (err < 0)
967 return err;
968
969 if (tb[IFLA_IFNAME])
970 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
971
972 ifm = nlmsg_data(nlh);
973 if (ifm->ifi_index > 0)
974 dev = __dev_get_by_index(net, ifm->ifi_index);
975 else if (tb[IFLA_IFNAME])
976 dev = __dev_get_by_name(net, ifname);
977 else
978 return -EINVAL;
979
980 if (!dev)
981 return -ENODEV;
982
983 ops = dev->rtnl_link_ops;
984 if (!ops)
985 return -EOPNOTSUPP;
986
987 ops->dellink(dev);
988 return 0;
989 }
990
991 struct net_device *rtnl_create_link(struct net *net, char *ifname,
992 const struct rtnl_link_ops *ops, struct nlattr *tb[])
993 {
994 int err;
995 struct net_device *dev;
996
997 err = -ENOMEM;
998 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
999 if (!dev)
1000 goto err;
1001
1002 if (strchr(dev->name, '%')) {
1003 err = dev_alloc_name(dev, dev->name);
1004 if (err < 0)
1005 goto err_free;
1006 }
1007
1008 dev_net_set(dev, net);
1009 dev->rtnl_link_ops = ops;
1010
1011 if (tb[IFLA_MTU])
1012 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1013 if (tb[IFLA_ADDRESS])
1014 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1015 nla_len(tb[IFLA_ADDRESS]));
1016 if (tb[IFLA_BROADCAST])
1017 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1018 nla_len(tb[IFLA_BROADCAST]));
1019 if (tb[IFLA_TXQLEN])
1020 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1021 if (tb[IFLA_OPERSTATE])
1022 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1023 if (tb[IFLA_LINKMODE])
1024 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1025
1026 return dev;
1027
1028 err_free:
1029 free_netdev(dev);
1030 err:
1031 return ERR_PTR(err);
1032 }
1033
1034 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1035 {
1036 struct net *net = sock_net(skb->sk);
1037 const struct rtnl_link_ops *ops;
1038 struct net_device *dev;
1039 struct ifinfomsg *ifm;
1040 char kind[MODULE_NAME_LEN];
1041 char ifname[IFNAMSIZ];
1042 struct nlattr *tb[IFLA_MAX+1];
1043 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1044 int err;
1045
1046 #ifdef CONFIG_MODULES
1047 replay:
1048 #endif
1049 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1050 if (err < 0)
1051 return err;
1052
1053 if (tb[IFLA_IFNAME])
1054 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1055 else
1056 ifname[0] = '\0';
1057
1058 ifm = nlmsg_data(nlh);
1059 if (ifm->ifi_index > 0)
1060 dev = __dev_get_by_index(net, ifm->ifi_index);
1061 else if (ifname[0])
1062 dev = __dev_get_by_name(net, ifname);
1063 else
1064 dev = NULL;
1065
1066 if ((err = validate_linkmsg(dev, tb)) < 0)
1067 return err;
1068
1069 if (tb[IFLA_LINKINFO]) {
1070 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1071 tb[IFLA_LINKINFO], ifla_info_policy);
1072 if (err < 0)
1073 return err;
1074 } else
1075 memset(linkinfo, 0, sizeof(linkinfo));
1076
1077 if (linkinfo[IFLA_INFO_KIND]) {
1078 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1079 ops = rtnl_link_ops_get(kind);
1080 } else {
1081 kind[0] = '\0';
1082 ops = NULL;
1083 }
1084
1085 if (1) {
1086 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1087
1088 if (ops) {
1089 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1090 err = nla_parse_nested(attr, ops->maxtype,
1091 linkinfo[IFLA_INFO_DATA],
1092 ops->policy);
1093 if (err < 0)
1094 return err;
1095 data = attr;
1096 }
1097 if (ops->validate) {
1098 err = ops->validate(tb, data);
1099 if (err < 0)
1100 return err;
1101 }
1102 }
1103
1104 if (dev) {
1105 int modified = 0;
1106
1107 if (nlh->nlmsg_flags & NLM_F_EXCL)
1108 return -EEXIST;
1109 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1110 return -EOPNOTSUPP;
1111
1112 if (linkinfo[IFLA_INFO_DATA]) {
1113 if (!ops || ops != dev->rtnl_link_ops ||
1114 !ops->changelink)
1115 return -EOPNOTSUPP;
1116
1117 err = ops->changelink(dev, tb, data);
1118 if (err < 0)
1119 return err;
1120 modified = 1;
1121 }
1122
1123 return do_setlink(dev, ifm, tb, ifname, modified);
1124 }
1125
1126 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1127 return -ENODEV;
1128
1129 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1130 return -EOPNOTSUPP;
1131 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1132 return -EOPNOTSUPP;
1133
1134 if (!ops) {
1135 #ifdef CONFIG_MODULES
1136 if (kind[0]) {
1137 __rtnl_unlock();
1138 request_module("rtnl-link-%s", kind);
1139 rtnl_lock();
1140 ops = rtnl_link_ops_get(kind);
1141 if (ops)
1142 goto replay;
1143 }
1144 #endif
1145 return -EOPNOTSUPP;
1146 }
1147
1148 if (!ifname[0])
1149 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1150
1151 dev = rtnl_create_link(net, ifname, ops, tb);
1152
1153 if (IS_ERR(dev))
1154 err = PTR_ERR(dev);
1155 else if (ops->newlink)
1156 err = ops->newlink(dev, tb, data);
1157 else
1158 err = register_netdevice(dev);
1159
1160 if (err < 0 && !IS_ERR(dev))
1161 free_netdev(dev);
1162 return err;
1163 }
1164 }
1165
1166 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1167 {
1168 struct net *net = sock_net(skb->sk);
1169 struct ifinfomsg *ifm;
1170 struct nlattr *tb[IFLA_MAX+1];
1171 struct net_device *dev = NULL;
1172 struct sk_buff *nskb;
1173 int err;
1174
1175 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1176 if (err < 0)
1177 return err;
1178
1179 ifm = nlmsg_data(nlh);
1180 if (ifm->ifi_index > 0) {
1181 dev = dev_get_by_index(net, ifm->ifi_index);
1182 if (dev == NULL)
1183 return -ENODEV;
1184 } else
1185 return -EINVAL;
1186
1187 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1188 if (nskb == NULL) {
1189 err = -ENOBUFS;
1190 goto errout;
1191 }
1192
1193 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1194 nlh->nlmsg_seq, 0, 0);
1195 if (err < 0) {
1196 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1197 WARN_ON(err == -EMSGSIZE);
1198 kfree_skb(nskb);
1199 goto errout;
1200 }
1201 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1202 errout:
1203 dev_put(dev);
1204
1205 return err;
1206 }
1207
1208 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1209 {
1210 int idx;
1211 int s_idx = cb->family;
1212
1213 if (s_idx == 0)
1214 s_idx = 1;
1215 for (idx=1; idx<NPROTO; idx++) {
1216 int type = cb->nlh->nlmsg_type-RTM_BASE;
1217 if (idx < s_idx || idx == PF_PACKET)
1218 continue;
1219 if (rtnl_msg_handlers[idx] == NULL ||
1220 rtnl_msg_handlers[idx][type].dumpit == NULL)
1221 continue;
1222 if (idx > s_idx)
1223 memset(&cb->args[0], 0, sizeof(cb->args));
1224 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1225 break;
1226 }
1227 cb->family = idx;
1228
1229 return skb->len;
1230 }
1231
1232 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1233 {
1234 struct net *net = dev_net(dev);
1235 struct sk_buff *skb;
1236 int err = -ENOBUFS;
1237
1238 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1239 if (skb == NULL)
1240 goto errout;
1241
1242 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1243 if (err < 0) {
1244 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1245 WARN_ON(err == -EMSGSIZE);
1246 kfree_skb(skb);
1247 goto errout;
1248 }
1249 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1250 return;
1251 errout:
1252 if (err < 0)
1253 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1254 }
1255
1256 /* Protected by RTNL sempahore. */
1257 static struct rtattr **rta_buf;
1258 static int rtattr_max;
1259
1260 /* Process one rtnetlink message. */
1261
1262 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1263 {
1264 struct net *net = sock_net(skb->sk);
1265 rtnl_doit_func doit;
1266 int sz_idx, kind;
1267 int min_len;
1268 int family;
1269 int type;
1270 int err;
1271
1272 type = nlh->nlmsg_type;
1273 if (type > RTM_MAX)
1274 return -EOPNOTSUPP;
1275
1276 type -= RTM_BASE;
1277
1278 /* All the messages must have at least 1 byte length */
1279 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1280 return 0;
1281
1282 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1283 if (family >= NPROTO)
1284 return -EAFNOSUPPORT;
1285
1286 sz_idx = type>>2;
1287 kind = type&3;
1288
1289 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1290 return -EPERM;
1291
1292 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1293 struct sock *rtnl;
1294 rtnl_dumpit_func dumpit;
1295
1296 dumpit = rtnl_get_dumpit(family, type);
1297 if (dumpit == NULL)
1298 return -EOPNOTSUPP;
1299
1300 __rtnl_unlock();
1301 rtnl = net->rtnl;
1302 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1303 rtnl_lock();
1304 return err;
1305 }
1306
1307 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1308
1309 min_len = rtm_min[sz_idx];
1310 if (nlh->nlmsg_len < min_len)
1311 return -EINVAL;
1312
1313 if (nlh->nlmsg_len > min_len) {
1314 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1315 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1316
1317 while (RTA_OK(attr, attrlen)) {
1318 unsigned flavor = attr->rta_type;
1319 if (flavor) {
1320 if (flavor > rta_max[sz_idx])
1321 return -EINVAL;
1322 rta_buf[flavor-1] = attr;
1323 }
1324 attr = RTA_NEXT(attr, attrlen);
1325 }
1326 }
1327
1328 doit = rtnl_get_doit(family, type);
1329 if (doit == NULL)
1330 return -EOPNOTSUPP;
1331
1332 return doit(skb, nlh, (void *)&rta_buf[0]);
1333 }
1334
1335 static void rtnetlink_rcv(struct sk_buff *skb)
1336 {
1337 rtnl_lock();
1338 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1339 rtnl_unlock();
1340 }
1341
1342 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1343 {
1344 struct net_device *dev = ptr;
1345
1346 switch (event) {
1347 case NETDEV_UNREGISTER:
1348 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1349 break;
1350 case NETDEV_UP:
1351 case NETDEV_DOWN:
1352 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1353 break;
1354 case NETDEV_REGISTER:
1355 case NETDEV_CHANGE:
1356 case NETDEV_GOING_DOWN:
1357 break;
1358 default:
1359 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1360 break;
1361 }
1362 return NOTIFY_DONE;
1363 }
1364
1365 static struct notifier_block rtnetlink_dev_notifier = {
1366 .notifier_call = rtnetlink_event,
1367 };
1368
1369
1370 static int rtnetlink_net_init(struct net *net)
1371 {
1372 struct sock *sk;
1373 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1374 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1375 if (!sk)
1376 return -ENOMEM;
1377 net->rtnl = sk;
1378 return 0;
1379 }
1380
1381 static void rtnetlink_net_exit(struct net *net)
1382 {
1383 netlink_kernel_release(net->rtnl);
1384 net->rtnl = NULL;
1385 }
1386
1387 static struct pernet_operations rtnetlink_net_ops = {
1388 .init = rtnetlink_net_init,
1389 .exit = rtnetlink_net_exit,
1390 };
1391
1392 void __init rtnetlink_init(void)
1393 {
1394 int i;
1395
1396 rtattr_max = 0;
1397 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1398 if (rta_max[i] > rtattr_max)
1399 rtattr_max = rta_max[i];
1400 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1401 if (!rta_buf)
1402 panic("rtnetlink_init: cannot allocate rta_buf\n");
1403
1404 if (register_pernet_subsys(&rtnetlink_net_ops))
1405 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1406
1407 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1408 register_netdevice_notifier(&rtnetlink_dev_notifier);
1409
1410 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1411 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1412 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1413 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1414
1415 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1416 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1417 }
1418
1419 EXPORT_SYMBOL(__rta_fill);
1420 EXPORT_SYMBOL(rtnetlink_put_metrics);
1421 EXPORT_SYMBOL(rtnl_lock);
1422 EXPORT_SYMBOL(rtnl_trylock);
1423 EXPORT_SYMBOL(rtnl_unlock);
1424 EXPORT_SYMBOL(rtnl_is_locked);
1425 EXPORT_SYMBOL(rtnl_unicast);
1426 EXPORT_SYMBOL(rtnl_notify);
1427 EXPORT_SYMBOL(rtnl_set_sk_err);
1428 EXPORT_SYMBOL(rtnl_create_link);
1429 EXPORT_SYMBOL(ifla_policy);
1430
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