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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / net / core / rtnetlink.c
blob0cb27722fd9f66c5aa14171fa8502d7d5e0c9836
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 /**
278 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
279 * @ops: struct rtnl_link_ops * to unregister
280 *
281 * The caller must hold the rtnl_mutex.
282 */
283 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
284 {
285 struct net_device *dev, *n;
286 struct net *net;
287
288 for_each_net(net) {
289 restart:
290 for_each_netdev_safe(net, dev, n) {
291 if (dev->rtnl_link_ops == ops) {
292 ops->dellink(dev);
293 goto restart;
294 }
295 }
296 }
297 list_del(&ops->list);
298 }
299
300 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
301
302 /**
303 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
304 * @ops: struct rtnl_link_ops * to unregister
305 */
306 void rtnl_link_unregister(struct rtnl_link_ops *ops)
307 {
308 rtnl_lock();
309 __rtnl_link_unregister(ops);
310 rtnl_unlock();
311 }
312
313 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
314
315 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
316 {
317 const struct rtnl_link_ops *ops;
318
319 list_for_each_entry(ops, &link_ops, list) {
320 if (!strcmp(ops->kind, kind))
321 return ops;
322 }
323 return NULL;
324 }
325
326 static size_t rtnl_link_get_size(const struct net_device *dev)
327 {
328 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
329 size_t size;
330
331 if (!ops)
332 return 0;
333
334 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
335 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
336
337 if (ops->get_size)
338 /* IFLA_INFO_DATA + nested data */
339 size += nlmsg_total_size(sizeof(struct nlattr)) +
340 ops->get_size(dev);
341
342 if (ops->get_xstats_size)
343 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
344
345 return size;
346 }
347
348 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
349 {
350 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
351 struct nlattr *linkinfo, *data;
352 int err = -EMSGSIZE;
353
354 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
355 if (linkinfo == NULL)
356 goto out;
357
358 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
359 goto err_cancel_link;
360 if (ops->fill_xstats) {
361 err = ops->fill_xstats(skb, dev);
362 if (err < 0)
363 goto err_cancel_link;
364 }
365 if (ops->fill_info) {
366 data = nla_nest_start(skb, IFLA_INFO_DATA);
367 if (data == NULL)
368 goto err_cancel_link;
369 err = ops->fill_info(skb, dev);
370 if (err < 0)
371 goto err_cancel_data;
372 nla_nest_end(skb, data);
373 }
374
375 nla_nest_end(skb, linkinfo);
376 return 0;
377
378 err_cancel_data:
379 nla_nest_cancel(skb, data);
380 err_cancel_link:
381 nla_nest_cancel(skb, linkinfo);
382 out:
383 return err;
384 }
385
386 static const int rtm_min[RTM_NR_FAMILIES] =
387 {
388 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
389 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
390 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
391 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
392 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
393 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
394 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
395 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
396 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
397 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
398 };
399
400 static const int rta_max[RTM_NR_FAMILIES] =
401 {
402 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
403 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
404 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
405 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
406 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
407 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
408 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
409 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
410 };
411
412 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
413 {
414 struct rtattr *rta;
415 int size = RTA_LENGTH(attrlen);
416
417 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
418 rta->rta_type = attrtype;
419 rta->rta_len = size;
420 memcpy(RTA_DATA(rta), data, attrlen);
421 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
422 }
423
424 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
425 {
426 struct sock *rtnl = net->rtnl;
427 int err = 0;
428
429 NETLINK_CB(skb).dst_group = group;
430 if (echo)
431 atomic_inc(&skb->users);
432 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
433 if (echo)
434 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
435 return err;
436 }
437
438 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
439 {
440 struct sock *rtnl = net->rtnl;
441
442 return nlmsg_unicast(rtnl, skb, pid);
443 }
444
445 int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
446 struct nlmsghdr *nlh, gfp_t flags)
447 {
448 struct sock *rtnl = net->rtnl;
449 int report = 0;
450
451 if (nlh)
452 report = nlmsg_report(nlh);
453
454 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
455 }
456
457 void rtnl_set_sk_err(struct net *net, u32 group, int error)
458 {
459 struct sock *rtnl = net->rtnl;
460
461 netlink_set_err(rtnl, 0, group, error);
462 }
463
464 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
465 {
466 struct nlattr *mx;
467 int i, valid = 0;
468
469 mx = nla_nest_start(skb, RTA_METRICS);
470 if (mx == NULL)
471 return -ENOBUFS;
472
473 for (i = 0; i < RTAX_MAX; i++) {
474 if (metrics[i]) {
475 valid++;
476 NLA_PUT_U32(skb, i+1, metrics[i]);
477 }
478 }
479
480 if (!valid) {
481 nla_nest_cancel(skb, mx);
482 return 0;
483 }
484
485 return nla_nest_end(skb, mx);
486
487 nla_put_failure:
488 return nla_nest_cancel(skb, mx);
489 }
490
491 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
492 u32 ts, u32 tsage, long expires, u32 error)
493 {
494 struct rta_cacheinfo ci = {
495 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
496 .rta_used = dst->__use,
497 .rta_clntref = atomic_read(&(dst->__refcnt)),
498 .rta_error = error,
499 .rta_id = id,
500 .rta_ts = ts,
501 .rta_tsage = tsage,
502 };
503
504 if (expires)
505 ci.rta_expires = jiffies_to_clock_t(expires);
506
507 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
508 }
509
510 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
511
512 static void set_operstate(struct net_device *dev, unsigned char transition)
513 {
514 unsigned char operstate = dev->operstate;
515
516 switch(transition) {
517 case IF_OPER_UP:
518 if ((operstate == IF_OPER_DORMANT ||
519 operstate == IF_OPER_UNKNOWN) &&
520 !netif_dormant(dev))
521 operstate = IF_OPER_UP;
522 break;
523
524 case IF_OPER_DORMANT:
525 if (operstate == IF_OPER_UP ||
526 operstate == IF_OPER_UNKNOWN)
527 operstate = IF_OPER_DORMANT;
528 break;
529 }
530
531 if (dev->operstate != operstate) {
532 write_lock_bh(&dev_base_lock);
533 dev->operstate = operstate;
534 write_unlock_bh(&dev_base_lock);
535 netdev_state_change(dev);
536 }
537 }
538
539 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
540 struct net_device_stats *b)
541 {
542 a->rx_packets = b->rx_packets;
543 a->tx_packets = b->tx_packets;
544 a->rx_bytes = b->rx_bytes;
545 a->tx_bytes = b->tx_bytes;
546 a->rx_errors = b->rx_errors;
547 a->tx_errors = b->tx_errors;
548 a->rx_dropped = b->rx_dropped;
549 a->tx_dropped = b->tx_dropped;
550
551 a->multicast = b->multicast;
552 a->collisions = b->collisions;
553
554 a->rx_length_errors = b->rx_length_errors;
555 a->rx_over_errors = b->rx_over_errors;
556 a->rx_crc_errors = b->rx_crc_errors;
557 a->rx_frame_errors = b->rx_frame_errors;
558 a->rx_fifo_errors = b->rx_fifo_errors;
559 a->rx_missed_errors = b->rx_missed_errors;
560
561 a->tx_aborted_errors = b->tx_aborted_errors;
562 a->tx_carrier_errors = b->tx_carrier_errors;
563 a->tx_fifo_errors = b->tx_fifo_errors;
564 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
565 a->tx_window_errors = b->tx_window_errors;
566
567 a->rx_compressed = b->rx_compressed;
568 a->tx_compressed = b->tx_compressed;
569 };
570
571 static inline size_t if_nlmsg_size(const struct net_device *dev)
572 {
573 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
574 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
575 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
576 + nla_total_size(sizeof(struct rtnl_link_ifmap))
577 + nla_total_size(sizeof(struct rtnl_link_stats))
578 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
579 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
580 + nla_total_size(4) /* IFLA_TXQLEN */
581 + nla_total_size(4) /* IFLA_WEIGHT */
582 + nla_total_size(4) /* IFLA_MTU */
583 + nla_total_size(4) /* IFLA_LINK */
584 + nla_total_size(4) /* IFLA_MASTER */
585 + nla_total_size(1) /* IFLA_OPERSTATE */
586 + nla_total_size(1) /* IFLA_LINKMODE */
587 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
588 }
589
590 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
591 int type, u32 pid, u32 seq, u32 change,
592 unsigned int flags)
593 {
594 struct ifinfomsg *ifm;
595 struct nlmsghdr *nlh;
596
597 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
598 if (nlh == NULL)
599 return -EMSGSIZE;
600
601 ifm = nlmsg_data(nlh);
602 ifm->ifi_family = AF_UNSPEC;
603 ifm->__ifi_pad = 0;
604 ifm->ifi_type = dev->type;
605 ifm->ifi_index = dev->ifindex;
606 ifm->ifi_flags = dev_get_flags(dev);
607 ifm->ifi_change = change;
608
609 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
610 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
611 NLA_PUT_U8(skb, IFLA_OPERSTATE,
612 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
613 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
614 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
615
616 if (dev->ifindex != dev->iflink)
617 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
618
619 if (dev->master)
620 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
621
622 if (dev->qdisc_sleeping)
623 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
624
625 if (1) {
626 struct rtnl_link_ifmap map = {
627 .mem_start = dev->mem_start,
628 .mem_end = dev->mem_end,
629 .base_addr = dev->base_addr,
630 .irq = dev->irq,
631 .dma = dev->dma,
632 .port = dev->if_port,
633 };
634 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
635 }
636
637 if (dev->addr_len) {
638 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
639 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
640 }
641
642 if (dev->get_stats) {
643 struct net_device_stats *stats = dev->get_stats(dev);
644 if (stats) {
645 struct nlattr *attr;
646
647 attr = nla_reserve(skb, IFLA_STATS,
648 sizeof(struct rtnl_link_stats));
649 if (attr == NULL)
650 goto nla_put_failure;
651
652 copy_rtnl_link_stats(nla_data(attr), stats);
653 }
654 }
655
656 if (dev->rtnl_link_ops) {
657 if (rtnl_link_fill(skb, dev) < 0)
658 goto nla_put_failure;
659 }
660
661 return nlmsg_end(skb, nlh);
662
663 nla_put_failure:
664 nlmsg_cancel(skb, nlh);
665 return -EMSGSIZE;
666 }
667
668 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
669 {
670 struct net *net = skb->sk->sk_net;
671 int idx;
672 int s_idx = cb->args[0];
673 struct net_device *dev;
674
675 idx = 0;
676 for_each_netdev(net, dev) {
677 if (idx < s_idx)
678 goto cont;
679 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
680 NETLINK_CB(cb->skb).pid,
681 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
682 break;
683 cont:
684 idx++;
685 }
686 cb->args[0] = idx;
687
688 return skb->len;
689 }
690
691 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
692 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
693 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
694 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
695 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
696 [IFLA_MTU] = { .type = NLA_U32 },
697 [IFLA_LINK] = { .type = NLA_U32 },
698 [IFLA_TXQLEN] = { .type = NLA_U32 },
699 [IFLA_WEIGHT] = { .type = NLA_U32 },
700 [IFLA_OPERSTATE] = { .type = NLA_U8 },
701 [IFLA_LINKMODE] = { .type = NLA_U8 },
702 [IFLA_LINKINFO] = { .type = NLA_NESTED },
703 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
704 };
705
706 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
707 [IFLA_INFO_KIND] = { .type = NLA_STRING },
708 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
709 };
710
711 static struct net *get_net_ns_by_pid(pid_t pid)
712 {
713 struct task_struct *tsk;
714 struct net *net;
715
716 /* Lookup the network namespace */
717 net = ERR_PTR(-ESRCH);
718 rcu_read_lock();
719 tsk = find_task_by_vpid(pid);
720 if (tsk) {
721 struct nsproxy *nsproxy;
722 nsproxy = task_nsproxy(tsk);
723 if (nsproxy)
724 net = get_net(nsproxy->net_ns);
725 }
726 rcu_read_unlock();
727 return net;
728 }
729
730 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
731 {
732 if (dev) {
733 if (tb[IFLA_ADDRESS] &&
734 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
735 return -EINVAL;
736
737 if (tb[IFLA_BROADCAST] &&
738 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
739 return -EINVAL;
740 }
741
742 return 0;
743 }
744
745 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
746 struct nlattr **tb, char *ifname, int modified)
747 {
748 int send_addr_notify = 0;
749 int err;
750
751 if (tb[IFLA_NET_NS_PID]) {
752 struct net *net;
753 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
754 if (IS_ERR(net)) {
755 err = PTR_ERR(net);
756 goto errout;
757 }
758 err = dev_change_net_namespace(dev, net, ifname);
759 put_net(net);
760 if (err)
761 goto errout;
762 modified = 1;
763 }
764
765 if (tb[IFLA_MAP]) {
766 struct rtnl_link_ifmap *u_map;
767 struct ifmap k_map;
768
769 if (!dev->set_config) {
770 err = -EOPNOTSUPP;
771 goto errout;
772 }
773
774 if (!netif_device_present(dev)) {
775 err = -ENODEV;
776 goto errout;
777 }
778
779 u_map = nla_data(tb[IFLA_MAP]);
780 k_map.mem_start = (unsigned long) u_map->mem_start;
781 k_map.mem_end = (unsigned long) u_map->mem_end;
782 k_map.base_addr = (unsigned short) u_map->base_addr;
783 k_map.irq = (unsigned char) u_map->irq;
784 k_map.dma = (unsigned char) u_map->dma;
785 k_map.port = (unsigned char) u_map->port;
786
787 err = dev->set_config(dev, &k_map);
788 if (err < 0)
789 goto errout;
790
791 modified = 1;
792 }
793
794 if (tb[IFLA_ADDRESS]) {
795 struct sockaddr *sa;
796 int len;
797
798 if (!dev->set_mac_address) {
799 err = -EOPNOTSUPP;
800 goto errout;
801 }
802
803 if (!netif_device_present(dev)) {
804 err = -ENODEV;
805 goto errout;
806 }
807
808 len = sizeof(sa_family_t) + dev->addr_len;
809 sa = kmalloc(len, GFP_KERNEL);
810 if (!sa) {
811 err = -ENOMEM;
812 goto errout;
813 }
814 sa->sa_family = dev->type;
815 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
816 dev->addr_len);
817 err = dev->set_mac_address(dev, sa);
818 kfree(sa);
819 if (err)
820 goto errout;
821 send_addr_notify = 1;
822 modified = 1;
823 }
824
825 if (tb[IFLA_MTU]) {
826 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
827 if (err < 0)
828 goto errout;
829 modified = 1;
830 }
831
832 /*
833 * Interface selected by interface index but interface
834 * name provided implies that a name change has been
835 * requested.
836 */
837 if (ifm->ifi_index > 0 && ifname[0]) {
838 err = dev_change_name(dev, ifname);
839 if (err < 0)
840 goto errout;
841 modified = 1;
842 }
843
844 if (tb[IFLA_BROADCAST]) {
845 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
846 send_addr_notify = 1;
847 }
848
849 if (ifm->ifi_flags || ifm->ifi_change) {
850 unsigned int flags = ifm->ifi_flags;
851
852 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
853 if (ifm->ifi_change)
854 flags = (flags & ifm->ifi_change) |
855 (dev->flags & ~ifm->ifi_change);
856 dev_change_flags(dev, flags);
857 }
858
859 if (tb[IFLA_TXQLEN])
860 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
861
862 if (tb[IFLA_OPERSTATE])
863 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
864
865 if (tb[IFLA_LINKMODE]) {
866 write_lock_bh(&dev_base_lock);
867 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
868 write_unlock_bh(&dev_base_lock);
869 }
870
871 err = 0;
872
873 errout:
874 if (err < 0 && modified && net_ratelimit())
875 printk(KERN_WARNING "A link change request failed with "
876 "some changes comitted already. Interface %s may "
877 "have been left with an inconsistent configuration, "
878 "please check.\n", dev->name);
879
880 if (send_addr_notify)
881 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
882 return err;
883 }
884
885 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
886 {
887 struct net *net = skb->sk->sk_net;
888 struct ifinfomsg *ifm;
889 struct net_device *dev;
890 int err;
891 struct nlattr *tb[IFLA_MAX+1];
892 char ifname[IFNAMSIZ];
893
894 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
895 if (err < 0)
896 goto errout;
897
898 if (tb[IFLA_IFNAME])
899 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
900 else
901 ifname[0] = '\0';
902
903 err = -EINVAL;
904 ifm = nlmsg_data(nlh);
905 if (ifm->ifi_index > 0)
906 dev = dev_get_by_index(net, ifm->ifi_index);
907 else if (tb[IFLA_IFNAME])
908 dev = dev_get_by_name(net, ifname);
909 else
910 goto errout;
911
912 if (dev == NULL) {
913 err = -ENODEV;
914 goto errout;
915 }
916
917 if ((err = validate_linkmsg(dev, tb)) < 0)
918 goto errout_dev;
919
920 err = do_setlink(dev, ifm, tb, ifname, 0);
921 errout_dev:
922 dev_put(dev);
923 errout:
924 return err;
925 }
926
927 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
928 {
929 struct net *net = skb->sk->sk_net;
930 const struct rtnl_link_ops *ops;
931 struct net_device *dev;
932 struct ifinfomsg *ifm;
933 char ifname[IFNAMSIZ];
934 struct nlattr *tb[IFLA_MAX+1];
935 int err;
936
937 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
938 if (err < 0)
939 return err;
940
941 if (tb[IFLA_IFNAME])
942 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
943
944 ifm = nlmsg_data(nlh);
945 if (ifm->ifi_index > 0)
946 dev = __dev_get_by_index(net, ifm->ifi_index);
947 else if (tb[IFLA_IFNAME])
948 dev = __dev_get_by_name(net, ifname);
949 else
950 return -EINVAL;
951
952 if (!dev)
953 return -ENODEV;
954
955 ops = dev->rtnl_link_ops;
956 if (!ops)
957 return -EOPNOTSUPP;
958
959 ops->dellink(dev);
960 return 0;
961 }
962
963 struct net_device *rtnl_create_link(struct net *net, char *ifname,
964 const struct rtnl_link_ops *ops, struct nlattr *tb[])
965 {
966 int err;
967 struct net_device *dev;
968
969 err = -ENOMEM;
970 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
971 if (!dev)
972 goto err;
973
974 if (strchr(dev->name, '%')) {
975 err = dev_alloc_name(dev, dev->name);
976 if (err < 0)
977 goto err_free;
978 }
979
980 dev->nd_net = net;
981 dev->rtnl_link_ops = ops;
982
983 if (tb[IFLA_MTU])
984 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
985 if (tb[IFLA_ADDRESS])
986 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
987 nla_len(tb[IFLA_ADDRESS]));
988 if (tb[IFLA_BROADCAST])
989 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
990 nla_len(tb[IFLA_BROADCAST]));
991 if (tb[IFLA_TXQLEN])
992 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
993 if (tb[IFLA_OPERSTATE])
994 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
995 if (tb[IFLA_LINKMODE])
996 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
997
998 return dev;
999
1000 err_free:
1001 free_netdev(dev);
1002 err:
1003 return ERR_PTR(err);
1004 }
1005
1006 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1007 {
1008 struct net *net = skb->sk->sk_net;
1009 const struct rtnl_link_ops *ops;
1010 struct net_device *dev;
1011 struct ifinfomsg *ifm;
1012 char kind[MODULE_NAME_LEN];
1013 char ifname[IFNAMSIZ];
1014 struct nlattr *tb[IFLA_MAX+1];
1015 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1016 int err;
1017
1018 #ifdef CONFIG_KMOD
1019 replay:
1020 #endif
1021 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1022 if (err < 0)
1023 return err;
1024
1025 if (tb[IFLA_IFNAME])
1026 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1027 else
1028 ifname[0] = '\0';
1029
1030 ifm = nlmsg_data(nlh);
1031 if (ifm->ifi_index > 0)
1032 dev = __dev_get_by_index(net, ifm->ifi_index);
1033 else if (ifname[0])
1034 dev = __dev_get_by_name(net, ifname);
1035 else
1036 dev = NULL;
1037
1038 if ((err = validate_linkmsg(dev, tb)) < 0)
1039 return err;
1040
1041 if (tb[IFLA_LINKINFO]) {
1042 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1043 tb[IFLA_LINKINFO], ifla_info_policy);
1044 if (err < 0)
1045 return err;
1046 } else
1047 memset(linkinfo, 0, sizeof(linkinfo));
1048
1049 if (linkinfo[IFLA_INFO_KIND]) {
1050 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1051 ops = rtnl_link_ops_get(kind);
1052 } else {
1053 kind[0] = '\0';
1054 ops = NULL;
1055 }
1056
1057 if (1) {
1058 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1059
1060 if (ops) {
1061 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1062 err = nla_parse_nested(attr, ops->maxtype,
1063 linkinfo[IFLA_INFO_DATA],
1064 ops->policy);
1065 if (err < 0)
1066 return err;
1067 data = attr;
1068 }
1069 if (ops->validate) {
1070 err = ops->validate(tb, data);
1071 if (err < 0)
1072 return err;
1073 }
1074 }
1075
1076 if (dev) {
1077 int modified = 0;
1078
1079 if (nlh->nlmsg_flags & NLM_F_EXCL)
1080 return -EEXIST;
1081 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1082 return -EOPNOTSUPP;
1083
1084 if (linkinfo[IFLA_INFO_DATA]) {
1085 if (!ops || ops != dev->rtnl_link_ops ||
1086 !ops->changelink)
1087 return -EOPNOTSUPP;
1088
1089 err = ops->changelink(dev, tb, data);
1090 if (err < 0)
1091 return err;
1092 modified = 1;
1093 }
1094
1095 return do_setlink(dev, ifm, tb, ifname, modified);
1096 }
1097
1098 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1099 return -ENODEV;
1100
1101 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1102 return -EOPNOTSUPP;
1103 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1104 return -EOPNOTSUPP;
1105
1106 if (!ops) {
1107 #ifdef CONFIG_KMOD
1108 if (kind[0]) {
1109 __rtnl_unlock();
1110 request_module("rtnl-link-%s", kind);
1111 rtnl_lock();
1112 ops = rtnl_link_ops_get(kind);
1113 if (ops)
1114 goto replay;
1115 }
1116 #endif
1117 return -EOPNOTSUPP;
1118 }
1119
1120 if (!ifname[0])
1121 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1122
1123 dev = rtnl_create_link(net, ifname, ops, tb);
1124
1125 if (IS_ERR(dev))
1126 err = PTR_ERR(dev);
1127 else if (ops->newlink)
1128 err = ops->newlink(dev, tb, data);
1129 else
1130 err = register_netdevice(dev);
1131
1132 if (err < 0 && !IS_ERR(dev))
1133 free_netdev(dev);
1134 return err;
1135 }
1136 }
1137
1138 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1139 {
1140 struct net *net = skb->sk->sk_net;
1141 struct ifinfomsg *ifm;
1142 struct nlattr *tb[IFLA_MAX+1];
1143 struct net_device *dev = NULL;
1144 struct sk_buff *nskb;
1145 int err;
1146
1147 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1148 if (err < 0)
1149 return err;
1150
1151 ifm = nlmsg_data(nlh);
1152 if (ifm->ifi_index > 0) {
1153 dev = dev_get_by_index(net, ifm->ifi_index);
1154 if (dev == NULL)
1155 return -ENODEV;
1156 } else
1157 return -EINVAL;
1158
1159 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1160 if (nskb == NULL) {
1161 err = -ENOBUFS;
1162 goto errout;
1163 }
1164
1165 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1166 nlh->nlmsg_seq, 0, 0);
1167 if (err < 0) {
1168 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1169 WARN_ON(err == -EMSGSIZE);
1170 kfree_skb(nskb);
1171 goto errout;
1172 }
1173 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1174 errout:
1175 dev_put(dev);
1176
1177 return err;
1178 }
1179
1180 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1181 {
1182 int idx;
1183 int s_idx = cb->family;
1184
1185 if (s_idx == 0)
1186 s_idx = 1;
1187 for (idx=1; idx<NPROTO; idx++) {
1188 int type = cb->nlh->nlmsg_type-RTM_BASE;
1189 if (idx < s_idx || idx == PF_PACKET)
1190 continue;
1191 if (rtnl_msg_handlers[idx] == NULL ||
1192 rtnl_msg_handlers[idx][type].dumpit == NULL)
1193 continue;
1194 if (idx > s_idx)
1195 memset(&cb->args[0], 0, sizeof(cb->args));
1196 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1197 break;
1198 }
1199 cb->family = idx;
1200
1201 return skb->len;
1202 }
1203
1204 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1205 {
1206 struct net *net = dev->nd_net;
1207 struct sk_buff *skb;
1208 int err = -ENOBUFS;
1209
1210 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1211 if (skb == NULL)
1212 goto errout;
1213
1214 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1215 if (err < 0) {
1216 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1217 WARN_ON(err == -EMSGSIZE);
1218 kfree_skb(skb);
1219 goto errout;
1220 }
1221 err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1222 errout:
1223 if (err < 0)
1224 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1225 }
1226
1227 /* Protected by RTNL sempahore. */
1228 static struct rtattr **rta_buf;
1229 static int rtattr_max;
1230
1231 /* Process one rtnetlink message. */
1232
1233 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1234 {
1235 struct net *net = skb->sk->sk_net;
1236 rtnl_doit_func doit;
1237 int sz_idx, kind;
1238 int min_len;
1239 int family;
1240 int type;
1241 int err;
1242
1243 type = nlh->nlmsg_type;
1244 if (type > RTM_MAX)
1245 return -EOPNOTSUPP;
1246
1247 type -= RTM_BASE;
1248
1249 /* All the messages must have at least 1 byte length */
1250 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1251 return 0;
1252
1253 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1254 if (family >= NPROTO)
1255 return -EAFNOSUPPORT;
1256
1257 sz_idx = type>>2;
1258 kind = type&3;
1259
1260 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1261 return -EPERM;
1262
1263 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1264 struct sock *rtnl;
1265 rtnl_dumpit_func dumpit;
1266
1267 dumpit = rtnl_get_dumpit(family, type);
1268 if (dumpit == NULL)
1269 return -EOPNOTSUPP;
1270
1271 __rtnl_unlock();
1272 rtnl = net->rtnl;
1273 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1274 rtnl_lock();
1275 return err;
1276 }
1277
1278 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1279
1280 min_len = rtm_min[sz_idx];
1281 if (nlh->nlmsg_len < min_len)
1282 return -EINVAL;
1283
1284 if (nlh->nlmsg_len > min_len) {
1285 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1286 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1287
1288 while (RTA_OK(attr, attrlen)) {
1289 unsigned flavor = attr->rta_type;
1290 if (flavor) {
1291 if (flavor > rta_max[sz_idx])
1292 return -EINVAL;
1293 rta_buf[flavor-1] = attr;
1294 }
1295 attr = RTA_NEXT(attr, attrlen);
1296 }
1297 }
1298
1299 doit = rtnl_get_doit(family, type);
1300 if (doit == NULL)
1301 return -EOPNOTSUPP;
1302
1303 return doit(skb, nlh, (void *)&rta_buf[0]);
1304 }
1305
1306 static void rtnetlink_rcv(struct sk_buff *skb)
1307 {
1308 rtnl_lock();
1309 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1310 rtnl_unlock();
1311 }
1312
1313 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1314 {
1315 struct net_device *dev = ptr;
1316
1317 switch (event) {
1318 case NETDEV_UNREGISTER:
1319 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1320 break;
1321 case NETDEV_REGISTER:
1322 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1323 break;
1324 case NETDEV_UP:
1325 case NETDEV_DOWN:
1326 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1327 break;
1328 case NETDEV_CHANGE:
1329 case NETDEV_GOING_DOWN:
1330 break;
1331 default:
1332 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1333 break;
1334 }
1335 return NOTIFY_DONE;
1336 }
1337
1338 static struct notifier_block rtnetlink_dev_notifier = {
1339 .notifier_call = rtnetlink_event,
1340 };
1341
1342
1343 static int rtnetlink_net_init(struct net *net)
1344 {
1345 struct sock *sk;
1346 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1347 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1348 if (!sk)
1349 return -ENOMEM;
1350 net->rtnl = sk;
1351 return 0;
1352 }
1353
1354 static void rtnetlink_net_exit(struct net *net)
1355 {
1356 netlink_kernel_release(net->rtnl);
1357 net->rtnl = NULL;
1358 }
1359
1360 static struct pernet_operations rtnetlink_net_ops = {
1361 .init = rtnetlink_net_init,
1362 .exit = rtnetlink_net_exit,
1363 };
1364
1365 void __init rtnetlink_init(void)
1366 {
1367 int i;
1368
1369 rtattr_max = 0;
1370 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1371 if (rta_max[i] > rtattr_max)
1372 rtattr_max = rta_max[i];
1373 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1374 if (!rta_buf)
1375 panic("rtnetlink_init: cannot allocate rta_buf\n");
1376
1377 if (register_pernet_subsys(&rtnetlink_net_ops))
1378 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1379
1380 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1381 register_netdevice_notifier(&rtnetlink_dev_notifier);
1382
1383 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1384 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1385 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1386 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1387
1388 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1389 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1390 }
1391
1392 EXPORT_SYMBOL(__rta_fill);
1393 EXPORT_SYMBOL(rtnetlink_put_metrics);
1394 EXPORT_SYMBOL(rtnl_lock);
1395 EXPORT_SYMBOL(rtnl_trylock);
1396 EXPORT_SYMBOL(rtnl_unlock);
1397 EXPORT_SYMBOL(rtnl_is_locked);
1398 EXPORT_SYMBOL(rtnl_unicast);
1399 EXPORT_SYMBOL(rtnl_notify);
1400 EXPORT_SYMBOL(rtnl_set_sk_err);
1401 EXPORT_SYMBOL(rtnl_create_link);
1402 EXPORT_SYMBOL(ifla_policy);
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