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[NET]: rtnl_link: fix use-after-free
[deliverable/linux.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/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 static struct sock *rtnl;
64
65 void rtnl_lock(void)
66 {
67 mutex_lock(&rtnl_mutex);
68 }
69
70 void __rtnl_unlock(void)
71 {
72 mutex_unlock(&rtnl_mutex);
73 }
74
75 void rtnl_unlock(void)
76 {
77 mutex_unlock(&rtnl_mutex);
78 netdev_run_todo();
79 }
80
81 int rtnl_trylock(void)
82 {
83 return mutex_trylock(&rtnl_mutex);
84 }
85
86 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
87 {
88 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
89
90 while (RTA_OK(rta, len)) {
91 unsigned flavor = rta->rta_type;
92 if (flavor && flavor <= maxattr)
93 tb[flavor-1] = rta;
94 rta = RTA_NEXT(rta, len);
95 }
96 return 0;
97 }
98
99 int __rtattr_parse_nested_compat(struct rtattr *tb[], int maxattr,
100 struct rtattr *rta, int len)
101 {
102 if (RTA_PAYLOAD(rta) < len)
103 return -1;
104 if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
105 rta = RTA_DATA(rta) + RTA_ALIGN(len);
106 return rtattr_parse_nested(tb, maxattr, rta);
107 }
108 memset(tb, 0, sizeof(struct rtattr *) * maxattr);
109 return 0;
110 }
111
112 static struct rtnl_link *rtnl_msg_handlers[NPROTO];
113
114 static inline int rtm_msgindex(int msgtype)
115 {
116 int msgindex = msgtype - RTM_BASE;
117
118 /*
119 * msgindex < 0 implies someone tried to register a netlink
120 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
121 * the message type has not been added to linux/rtnetlink.h
122 */
123 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
124
125 return msgindex;
126 }
127
128 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
129 {
130 struct rtnl_link *tab;
131
132 tab = rtnl_msg_handlers[protocol];
133 if (tab == NULL || tab[msgindex].doit == NULL)
134 tab = rtnl_msg_handlers[PF_UNSPEC];
135
136 return tab ? tab[msgindex].doit : NULL;
137 }
138
139 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
140 {
141 struct rtnl_link *tab;
142
143 tab = rtnl_msg_handlers[protocol];
144 if (tab == NULL || tab[msgindex].dumpit == NULL)
145 tab = rtnl_msg_handlers[PF_UNSPEC];
146
147 return tab ? tab[msgindex].dumpit : NULL;
148 }
149
150 /**
151 * __rtnl_register - Register a rtnetlink message type
152 * @protocol: Protocol family or PF_UNSPEC
153 * @msgtype: rtnetlink message type
154 * @doit: Function pointer called for each request message
155 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
156 *
157 * Registers the specified function pointers (at least one of them has
158 * to be non-NULL) to be called whenever a request message for the
159 * specified protocol family and message type is received.
160 *
161 * The special protocol family PF_UNSPEC may be used to define fallback
162 * function pointers for the case when no entry for the specific protocol
163 * family exists.
164 *
165 * Returns 0 on success or a negative error code.
166 */
167 int __rtnl_register(int protocol, int msgtype,
168 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
169 {
170 struct rtnl_link *tab;
171 int msgindex;
172
173 BUG_ON(protocol < 0 || protocol >= NPROTO);
174 msgindex = rtm_msgindex(msgtype);
175
176 tab = rtnl_msg_handlers[protocol];
177 if (tab == NULL) {
178 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
179 if (tab == NULL)
180 return -ENOBUFS;
181
182 rtnl_msg_handlers[protocol] = tab;
183 }
184
185 if (doit)
186 tab[msgindex].doit = doit;
187
188 if (dumpit)
189 tab[msgindex].dumpit = dumpit;
190
191 return 0;
192 }
193
194 EXPORT_SYMBOL_GPL(__rtnl_register);
195
196 /**
197 * rtnl_register - Register a rtnetlink message type
198 *
199 * Identical to __rtnl_register() but panics on failure. This is useful
200 * as failure of this function is very unlikely, it can only happen due
201 * to lack of memory when allocating the chain to store all message
202 * handlers for a protocol. Meant for use in init functions where lack
203 * of memory implies no sense in continueing.
204 */
205 void rtnl_register(int protocol, int msgtype,
206 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
207 {
208 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
209 panic("Unable to register rtnetlink message handler, "
210 "protocol = %d, message type = %d\n",
211 protocol, msgtype);
212 }
213
214 EXPORT_SYMBOL_GPL(rtnl_register);
215
216 /**
217 * rtnl_unregister - Unregister a rtnetlink message type
218 * @protocol: Protocol family or PF_UNSPEC
219 * @msgtype: rtnetlink message type
220 *
221 * Returns 0 on success or a negative error code.
222 */
223 int rtnl_unregister(int protocol, int msgtype)
224 {
225 int msgindex;
226
227 BUG_ON(protocol < 0 || protocol >= NPROTO);
228 msgindex = rtm_msgindex(msgtype);
229
230 if (rtnl_msg_handlers[protocol] == NULL)
231 return -ENOENT;
232
233 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
234 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
235
236 return 0;
237 }
238
239 EXPORT_SYMBOL_GPL(rtnl_unregister);
240
241 /**
242 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
243 * @protocol : Protocol family or PF_UNSPEC
244 *
245 * Identical to calling rtnl_unregster() for all registered message types
246 * of a certain protocol family.
247 */
248 void rtnl_unregister_all(int protocol)
249 {
250 BUG_ON(protocol < 0 || protocol >= NPROTO);
251
252 kfree(rtnl_msg_handlers[protocol]);
253 rtnl_msg_handlers[protocol] = NULL;
254 }
255
256 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
257
258 static LIST_HEAD(link_ops);
259
260 /**
261 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
262 * @ops: struct rtnl_link_ops * to register
263 *
264 * The caller must hold the rtnl_mutex. This function should be used
265 * by drivers that create devices during module initialization. It
266 * must be called before registering the devices.
267 *
268 * Returns 0 on success or a negative error code.
269 */
270 int __rtnl_link_register(struct rtnl_link_ops *ops)
271 {
272 if (!ops->dellink)
273 ops->dellink = unregister_netdevice;
274
275 list_add_tail(&ops->list, &link_ops);
276 return 0;
277 }
278
279 EXPORT_SYMBOL_GPL(__rtnl_link_register);
280
281 /**
282 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
283 * @ops: struct rtnl_link_ops * to register
284 *
285 * Returns 0 on success or a negative error code.
286 */
287 int rtnl_link_register(struct rtnl_link_ops *ops)
288 {
289 int err;
290
291 rtnl_lock();
292 err = __rtnl_link_register(ops);
293 rtnl_unlock();
294 return err;
295 }
296
297 EXPORT_SYMBOL_GPL(rtnl_link_register);
298
299 /**
300 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
301 * @ops: struct rtnl_link_ops * to unregister
302 *
303 * The caller must hold the rtnl_mutex.
304 */
305 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
306 {
307 struct net_device *dev, *n;
308 struct net *net;
309
310 for_each_net(net) {
311 restart:
312 for_each_netdev_safe(net, dev, n) {
313 if (dev->rtnl_link_ops == ops) {
314 ops->dellink(dev);
315 goto restart;
316 }
317 }
318 }
319 list_del(&ops->list);
320 }
321
322 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
323
324 /**
325 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
326 * @ops: struct rtnl_link_ops * to unregister
327 */
328 void rtnl_link_unregister(struct rtnl_link_ops *ops)
329 {
330 rtnl_lock();
331 __rtnl_link_unregister(ops);
332 rtnl_unlock();
333 }
334
335 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
336
337 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
338 {
339 const struct rtnl_link_ops *ops;
340
341 list_for_each_entry(ops, &link_ops, list) {
342 if (!strcmp(ops->kind, kind))
343 return ops;
344 }
345 return NULL;
346 }
347
348 static size_t rtnl_link_get_size(const struct net_device *dev)
349 {
350 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
351 size_t size;
352
353 if (!ops)
354 return 0;
355
356 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
357 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
358
359 if (ops->get_size)
360 /* IFLA_INFO_DATA + nested data */
361 size += nlmsg_total_size(sizeof(struct nlattr)) +
362 ops->get_size(dev);
363
364 if (ops->get_xstats_size)
365 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
366
367 return size;
368 }
369
370 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
371 {
372 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
373 struct nlattr *linkinfo, *data;
374 int err = -EMSGSIZE;
375
376 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
377 if (linkinfo == NULL)
378 goto out;
379
380 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
381 goto err_cancel_link;
382 if (ops->fill_xstats) {
383 err = ops->fill_xstats(skb, dev);
384 if (err < 0)
385 goto err_cancel_link;
386 }
387 if (ops->fill_info) {
388 data = nla_nest_start(skb, IFLA_INFO_DATA);
389 if (data == NULL)
390 goto err_cancel_link;
391 err = ops->fill_info(skb, dev);
392 if (err < 0)
393 goto err_cancel_data;
394 nla_nest_end(skb, data);
395 }
396
397 nla_nest_end(skb, linkinfo);
398 return 0;
399
400 err_cancel_data:
401 nla_nest_cancel(skb, data);
402 err_cancel_link:
403 nla_nest_cancel(skb, linkinfo);
404 out:
405 return err;
406 }
407
408 static const int rtm_min[RTM_NR_FAMILIES] =
409 {
410 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
411 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
412 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
413 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
414 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
415 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
416 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
417 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
418 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
419 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
420 };
421
422 static const int rta_max[RTM_NR_FAMILIES] =
423 {
424 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
425 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
426 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
427 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
428 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
429 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
430 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
431 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
432 };
433
434 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
435 {
436 struct rtattr *rta;
437 int size = RTA_LENGTH(attrlen);
438
439 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
440 rta->rta_type = attrtype;
441 rta->rta_len = size;
442 memcpy(RTA_DATA(rta), data, attrlen);
443 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
444 }
445
446 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
447 {
448 size_t ret = RTA_PAYLOAD(rta);
449 char *src = RTA_DATA(rta);
450
451 if (ret > 0 && src[ret - 1] == '\0')
452 ret--;
453 if (size > 0) {
454 size_t len = (ret >= size) ? size - 1 : ret;
455 memset(dest, 0, size);
456 memcpy(dest, src, len);
457 }
458 return ret;
459 }
460
461 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
462 {
463 int err = 0;
464
465 NETLINK_CB(skb).dst_group = group;
466 if (echo)
467 atomic_inc(&skb->users);
468 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
469 if (echo)
470 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
471 return err;
472 }
473
474 int rtnl_unicast(struct sk_buff *skb, u32 pid)
475 {
476 return nlmsg_unicast(rtnl, skb, pid);
477 }
478
479 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
480 struct nlmsghdr *nlh, gfp_t flags)
481 {
482 int report = 0;
483
484 if (nlh)
485 report = nlmsg_report(nlh);
486
487 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
488 }
489
490 void rtnl_set_sk_err(u32 group, int error)
491 {
492 netlink_set_err(rtnl, 0, group, error);
493 }
494
495 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
496 {
497 struct nlattr *mx;
498 int i, valid = 0;
499
500 mx = nla_nest_start(skb, RTA_METRICS);
501 if (mx == NULL)
502 return -ENOBUFS;
503
504 for (i = 0; i < RTAX_MAX; i++) {
505 if (metrics[i]) {
506 valid++;
507 NLA_PUT_U32(skb, i+1, metrics[i]);
508 }
509 }
510
511 if (!valid) {
512 nla_nest_cancel(skb, mx);
513 return 0;
514 }
515
516 return nla_nest_end(skb, mx);
517
518 nla_put_failure:
519 return nla_nest_cancel(skb, mx);
520 }
521
522 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
523 u32 ts, u32 tsage, long expires, u32 error)
524 {
525 struct rta_cacheinfo ci = {
526 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
527 .rta_used = dst->__use,
528 .rta_clntref = atomic_read(&(dst->__refcnt)),
529 .rta_error = error,
530 .rta_id = id,
531 .rta_ts = ts,
532 .rta_tsage = tsage,
533 };
534
535 if (expires)
536 ci.rta_expires = jiffies_to_clock_t(expires);
537
538 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
539 }
540
541 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
542
543 static void set_operstate(struct net_device *dev, unsigned char transition)
544 {
545 unsigned char operstate = dev->operstate;
546
547 switch(transition) {
548 case IF_OPER_UP:
549 if ((operstate == IF_OPER_DORMANT ||
550 operstate == IF_OPER_UNKNOWN) &&
551 !netif_dormant(dev))
552 operstate = IF_OPER_UP;
553 break;
554
555 case IF_OPER_DORMANT:
556 if (operstate == IF_OPER_UP ||
557 operstate == IF_OPER_UNKNOWN)
558 operstate = IF_OPER_DORMANT;
559 break;
560 }
561
562 if (dev->operstate != operstate) {
563 write_lock_bh(&dev_base_lock);
564 dev->operstate = operstate;
565 write_unlock_bh(&dev_base_lock);
566 netdev_state_change(dev);
567 }
568 }
569
570 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
571 struct net_device_stats *b)
572 {
573 a->rx_packets = b->rx_packets;
574 a->tx_packets = b->tx_packets;
575 a->rx_bytes = b->rx_bytes;
576 a->tx_bytes = b->tx_bytes;
577 a->rx_errors = b->rx_errors;
578 a->tx_errors = b->tx_errors;
579 a->rx_dropped = b->rx_dropped;
580 a->tx_dropped = b->tx_dropped;
581
582 a->multicast = b->multicast;
583 a->collisions = b->collisions;
584
585 a->rx_length_errors = b->rx_length_errors;
586 a->rx_over_errors = b->rx_over_errors;
587 a->rx_crc_errors = b->rx_crc_errors;
588 a->rx_frame_errors = b->rx_frame_errors;
589 a->rx_fifo_errors = b->rx_fifo_errors;
590 a->rx_missed_errors = b->rx_missed_errors;
591
592 a->tx_aborted_errors = b->tx_aborted_errors;
593 a->tx_carrier_errors = b->tx_carrier_errors;
594 a->tx_fifo_errors = b->tx_fifo_errors;
595 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
596 a->tx_window_errors = b->tx_window_errors;
597
598 a->rx_compressed = b->rx_compressed;
599 a->tx_compressed = b->tx_compressed;
600 };
601
602 static inline size_t if_nlmsg_size(const struct net_device *dev)
603 {
604 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
605 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
606 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
607 + nla_total_size(sizeof(struct rtnl_link_ifmap))
608 + nla_total_size(sizeof(struct rtnl_link_stats))
609 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
610 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
611 + nla_total_size(4) /* IFLA_TXQLEN */
612 + nla_total_size(4) /* IFLA_WEIGHT */
613 + nla_total_size(4) /* IFLA_MTU */
614 + nla_total_size(4) /* IFLA_LINK */
615 + nla_total_size(4) /* IFLA_MASTER */
616 + nla_total_size(1) /* IFLA_OPERSTATE */
617 + nla_total_size(1) /* IFLA_LINKMODE */
618 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
619 }
620
621 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
622 int type, u32 pid, u32 seq, u32 change,
623 unsigned int flags)
624 {
625 struct ifinfomsg *ifm;
626 struct nlmsghdr *nlh;
627
628 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
629 if (nlh == NULL)
630 return -EMSGSIZE;
631
632 ifm = nlmsg_data(nlh);
633 ifm->ifi_family = AF_UNSPEC;
634 ifm->__ifi_pad = 0;
635 ifm->ifi_type = dev->type;
636 ifm->ifi_index = dev->ifindex;
637 ifm->ifi_flags = dev_get_flags(dev);
638 ifm->ifi_change = change;
639
640 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
641 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
642 NLA_PUT_U8(skb, IFLA_OPERSTATE,
643 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
644 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
645 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
646
647 if (dev->ifindex != dev->iflink)
648 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
649
650 if (dev->master)
651 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
652
653 if (dev->qdisc_sleeping)
654 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
655
656 if (1) {
657 struct rtnl_link_ifmap map = {
658 .mem_start = dev->mem_start,
659 .mem_end = dev->mem_end,
660 .base_addr = dev->base_addr,
661 .irq = dev->irq,
662 .dma = dev->dma,
663 .port = dev->if_port,
664 };
665 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
666 }
667
668 if (dev->addr_len) {
669 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
670 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
671 }
672
673 if (dev->get_stats) {
674 struct net_device_stats *stats = dev->get_stats(dev);
675 if (stats) {
676 struct nlattr *attr;
677
678 attr = nla_reserve(skb, IFLA_STATS,
679 sizeof(struct rtnl_link_stats));
680 if (attr == NULL)
681 goto nla_put_failure;
682
683 copy_rtnl_link_stats(nla_data(attr), stats);
684 }
685 }
686
687 if (dev->rtnl_link_ops) {
688 if (rtnl_link_fill(skb, dev) < 0)
689 goto nla_put_failure;
690 }
691
692 return nlmsg_end(skb, nlh);
693
694 nla_put_failure:
695 nlmsg_cancel(skb, nlh);
696 return -EMSGSIZE;
697 }
698
699 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
700 {
701 struct net *net = skb->sk->sk_net;
702 int idx;
703 int s_idx = cb->args[0];
704 struct net_device *dev;
705
706 idx = 0;
707 for_each_netdev(net, dev) {
708 if (idx < s_idx)
709 goto cont;
710 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
711 NETLINK_CB(cb->skb).pid,
712 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
713 break;
714 cont:
715 idx++;
716 }
717 cb->args[0] = idx;
718
719 return skb->len;
720 }
721
722 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
723 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
724 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
725 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
726 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
727 [IFLA_MTU] = { .type = NLA_U32 },
728 [IFLA_TXQLEN] = { .type = NLA_U32 },
729 [IFLA_WEIGHT] = { .type = NLA_U32 },
730 [IFLA_OPERSTATE] = { .type = NLA_U8 },
731 [IFLA_LINKMODE] = { .type = NLA_U8 },
732 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
733 };
734
735 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
736 [IFLA_INFO_KIND] = { .type = NLA_STRING },
737 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
738 };
739
740 static struct net *get_net_ns_by_pid(pid_t pid)
741 {
742 struct task_struct *tsk;
743 struct net *net;
744
745 /* Lookup the network namespace */
746 net = ERR_PTR(-ESRCH);
747 rcu_read_lock();
748 tsk = find_task_by_vpid(pid);
749 if (tsk) {
750 struct nsproxy *nsproxy;
751 nsproxy = task_nsproxy(tsk);
752 if (nsproxy)
753 net = get_net(nsproxy->net_ns);
754 }
755 rcu_read_unlock();
756 return net;
757 }
758
759 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
760 struct nlattr **tb, char *ifname, int modified)
761 {
762 int send_addr_notify = 0;
763 int err;
764
765 if (tb[IFLA_NET_NS_PID]) {
766 struct net *net;
767 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
768 if (IS_ERR(net)) {
769 err = PTR_ERR(net);
770 goto errout;
771 }
772 err = dev_change_net_namespace(dev, net, ifname);
773 put_net(net);
774 if (err)
775 goto errout;
776 modified = 1;
777 }
778
779 if (tb[IFLA_MAP]) {
780 struct rtnl_link_ifmap *u_map;
781 struct ifmap k_map;
782
783 if (!dev->set_config) {
784 err = -EOPNOTSUPP;
785 goto errout;
786 }
787
788 if (!netif_device_present(dev)) {
789 err = -ENODEV;
790 goto errout;
791 }
792
793 u_map = nla_data(tb[IFLA_MAP]);
794 k_map.mem_start = (unsigned long) u_map->mem_start;
795 k_map.mem_end = (unsigned long) u_map->mem_end;
796 k_map.base_addr = (unsigned short) u_map->base_addr;
797 k_map.irq = (unsigned char) u_map->irq;
798 k_map.dma = (unsigned char) u_map->dma;
799 k_map.port = (unsigned char) u_map->port;
800
801 err = dev->set_config(dev, &k_map);
802 if (err < 0)
803 goto errout;
804
805 modified = 1;
806 }
807
808 if (tb[IFLA_ADDRESS]) {
809 struct sockaddr *sa;
810 int len;
811
812 if (!dev->set_mac_address) {
813 err = -EOPNOTSUPP;
814 goto errout;
815 }
816
817 if (!netif_device_present(dev)) {
818 err = -ENODEV;
819 goto errout;
820 }
821
822 len = sizeof(sa_family_t) + dev->addr_len;
823 sa = kmalloc(len, GFP_KERNEL);
824 if (!sa) {
825 err = -ENOMEM;
826 goto errout;
827 }
828 sa->sa_family = dev->type;
829 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
830 dev->addr_len);
831 err = dev->set_mac_address(dev, sa);
832 kfree(sa);
833 if (err)
834 goto errout;
835 send_addr_notify = 1;
836 modified = 1;
837 }
838
839 if (tb[IFLA_MTU]) {
840 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
841 if (err < 0)
842 goto errout;
843 modified = 1;
844 }
845
846 /*
847 * Interface selected by interface index but interface
848 * name provided implies that a name change has been
849 * requested.
850 */
851 if (ifm->ifi_index > 0 && ifname[0]) {
852 err = dev_change_name(dev, ifname);
853 if (err < 0)
854 goto errout;
855 modified = 1;
856 }
857
858 if (tb[IFLA_BROADCAST]) {
859 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
860 send_addr_notify = 1;
861 }
862
863 if (ifm->ifi_flags || ifm->ifi_change) {
864 unsigned int flags = ifm->ifi_flags;
865
866 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
867 if (ifm->ifi_change)
868 flags = (flags & ifm->ifi_change) |
869 (dev->flags & ~ifm->ifi_change);
870 dev_change_flags(dev, flags);
871 }
872
873 if (tb[IFLA_TXQLEN])
874 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
875
876 if (tb[IFLA_OPERSTATE])
877 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
878
879 if (tb[IFLA_LINKMODE]) {
880 write_lock_bh(&dev_base_lock);
881 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
882 write_unlock_bh(&dev_base_lock);
883 }
884
885 err = 0;
886
887 errout:
888 if (err < 0 && modified && net_ratelimit())
889 printk(KERN_WARNING "A link change request failed with "
890 "some changes comitted already. Interface %s may "
891 "have been left with an inconsistent configuration, "
892 "please check.\n", dev->name);
893
894 if (send_addr_notify)
895 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
896 return err;
897 }
898
899 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
900 {
901 struct net *net = skb->sk->sk_net;
902 struct ifinfomsg *ifm;
903 struct net_device *dev;
904 int err;
905 struct nlattr *tb[IFLA_MAX+1];
906 char ifname[IFNAMSIZ];
907
908 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
909 if (err < 0)
910 goto errout;
911
912 if (tb[IFLA_IFNAME])
913 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
914 else
915 ifname[0] = '\0';
916
917 err = -EINVAL;
918 ifm = nlmsg_data(nlh);
919 if (ifm->ifi_index > 0)
920 dev = dev_get_by_index(net, ifm->ifi_index);
921 else if (tb[IFLA_IFNAME])
922 dev = dev_get_by_name(net, ifname);
923 else
924 goto errout;
925
926 if (dev == NULL) {
927 err = -ENODEV;
928 goto errout;
929 }
930
931 if (tb[IFLA_ADDRESS] &&
932 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
933 goto errout_dev;
934
935 if (tb[IFLA_BROADCAST] &&
936 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
937 goto errout_dev;
938
939 err = do_setlink(dev, ifm, tb, ifname, 0);
940 errout_dev:
941 dev_put(dev);
942 errout:
943 return err;
944 }
945
946 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
947 {
948 struct net *net = skb->sk->sk_net;
949 const struct rtnl_link_ops *ops;
950 struct net_device *dev;
951 struct ifinfomsg *ifm;
952 char ifname[IFNAMSIZ];
953 struct nlattr *tb[IFLA_MAX+1];
954 int err;
955
956 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
957 if (err < 0)
958 return err;
959
960 if (tb[IFLA_IFNAME])
961 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
962
963 ifm = nlmsg_data(nlh);
964 if (ifm->ifi_index > 0)
965 dev = __dev_get_by_index(net, ifm->ifi_index);
966 else if (tb[IFLA_IFNAME])
967 dev = __dev_get_by_name(net, ifname);
968 else
969 return -EINVAL;
970
971 if (!dev)
972 return -ENODEV;
973
974 ops = dev->rtnl_link_ops;
975 if (!ops)
976 return -EOPNOTSUPP;
977
978 ops->dellink(dev);
979 return 0;
980 }
981
982 struct net_device *rtnl_create_link(struct net *net, char *ifname,
983 const struct rtnl_link_ops *ops, struct nlattr *tb[])
984 {
985 int err;
986 struct net_device *dev;
987
988 err = -ENOMEM;
989 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
990 if (!dev)
991 goto err;
992
993 if (strchr(dev->name, '%')) {
994 err = dev_alloc_name(dev, dev->name);
995 if (err < 0)
996 goto err_free;
997 }
998
999 dev->nd_net = net;
1000 dev->rtnl_link_ops = ops;
1001
1002 if (tb[IFLA_MTU])
1003 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1004 if (tb[IFLA_ADDRESS])
1005 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1006 nla_len(tb[IFLA_ADDRESS]));
1007 if (tb[IFLA_BROADCAST])
1008 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1009 nla_len(tb[IFLA_BROADCAST]));
1010 if (tb[IFLA_TXQLEN])
1011 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1012 if (tb[IFLA_OPERSTATE])
1013 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1014 if (tb[IFLA_LINKMODE])
1015 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1016
1017 return dev;
1018
1019 err_free:
1020 free_netdev(dev);
1021 err:
1022 return ERR_PTR(err);
1023 }
1024
1025 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1026 {
1027 struct net *net = skb->sk->sk_net;
1028 const struct rtnl_link_ops *ops;
1029 struct net_device *dev;
1030 struct ifinfomsg *ifm;
1031 char kind[MODULE_NAME_LEN];
1032 char ifname[IFNAMSIZ];
1033 struct nlattr *tb[IFLA_MAX+1];
1034 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1035 int err;
1036
1037 #ifdef CONFIG_KMOD
1038 replay:
1039 #endif
1040 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1041 if (err < 0)
1042 return err;
1043
1044 if (tb[IFLA_IFNAME])
1045 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1046 else
1047 ifname[0] = '\0';
1048
1049 ifm = nlmsg_data(nlh);
1050 if (ifm->ifi_index > 0)
1051 dev = __dev_get_by_index(net, ifm->ifi_index);
1052 else if (ifname[0])
1053 dev = __dev_get_by_name(net, ifname);
1054 else
1055 dev = NULL;
1056
1057 if (tb[IFLA_LINKINFO]) {
1058 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1059 tb[IFLA_LINKINFO], ifla_info_policy);
1060 if (err < 0)
1061 return err;
1062 } else
1063 memset(linkinfo, 0, sizeof(linkinfo));
1064
1065 if (linkinfo[IFLA_INFO_KIND]) {
1066 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1067 ops = rtnl_link_ops_get(kind);
1068 } else {
1069 kind[0] = '\0';
1070 ops = NULL;
1071 }
1072
1073 if (1) {
1074 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1075
1076 if (ops) {
1077 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1078 err = nla_parse_nested(attr, ops->maxtype,
1079 linkinfo[IFLA_INFO_DATA],
1080 ops->policy);
1081 if (err < 0)
1082 return err;
1083 data = attr;
1084 }
1085 if (ops->validate) {
1086 err = ops->validate(tb, data);
1087 if (err < 0)
1088 return err;
1089 }
1090 }
1091
1092 if (dev) {
1093 int modified = 0;
1094
1095 if (nlh->nlmsg_flags & NLM_F_EXCL)
1096 return -EEXIST;
1097 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1098 return -EOPNOTSUPP;
1099
1100 if (linkinfo[IFLA_INFO_DATA]) {
1101 if (!ops || ops != dev->rtnl_link_ops ||
1102 !ops->changelink)
1103 return -EOPNOTSUPP;
1104
1105 err = ops->changelink(dev, tb, data);
1106 if (err < 0)
1107 return err;
1108 modified = 1;
1109 }
1110
1111 return do_setlink(dev, ifm, tb, ifname, modified);
1112 }
1113
1114 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1115 return -ENODEV;
1116
1117 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1118 return -EOPNOTSUPP;
1119 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1120 return -EOPNOTSUPP;
1121
1122 if (!ops) {
1123 #ifdef CONFIG_KMOD
1124 if (kind[0]) {
1125 __rtnl_unlock();
1126 request_module("rtnl-link-%s", kind);
1127 rtnl_lock();
1128 ops = rtnl_link_ops_get(kind);
1129 if (ops)
1130 goto replay;
1131 }
1132 #endif
1133 return -EOPNOTSUPP;
1134 }
1135
1136 if (!ifname[0])
1137 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1138
1139 dev = rtnl_create_link(net, ifname, ops, tb);
1140
1141 if (IS_ERR(dev))
1142 err = PTR_ERR(dev);
1143 else if (ops->newlink)
1144 err = ops->newlink(dev, tb, data);
1145 else
1146 err = register_netdevice(dev);
1147
1148 if (err < 0 && !IS_ERR(dev))
1149 free_netdev(dev);
1150 return err;
1151 }
1152 }
1153
1154 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1155 {
1156 struct net *net = skb->sk->sk_net;
1157 struct ifinfomsg *ifm;
1158 struct nlattr *tb[IFLA_MAX+1];
1159 struct net_device *dev = NULL;
1160 struct sk_buff *nskb;
1161 int err;
1162
1163 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1164 if (err < 0)
1165 return err;
1166
1167 ifm = nlmsg_data(nlh);
1168 if (ifm->ifi_index > 0) {
1169 dev = dev_get_by_index(net, ifm->ifi_index);
1170 if (dev == NULL)
1171 return -ENODEV;
1172 } else
1173 return -EINVAL;
1174
1175 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1176 if (nskb == NULL) {
1177 err = -ENOBUFS;
1178 goto errout;
1179 }
1180
1181 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1182 nlh->nlmsg_seq, 0, 0);
1183 if (err < 0) {
1184 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1185 WARN_ON(err == -EMSGSIZE);
1186 kfree_skb(nskb);
1187 goto errout;
1188 }
1189 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
1190 errout:
1191 dev_put(dev);
1192
1193 return err;
1194 }
1195
1196 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1197 {
1198 int idx;
1199 int s_idx = cb->family;
1200
1201 if (s_idx == 0)
1202 s_idx = 1;
1203 for (idx=1; idx<NPROTO; idx++) {
1204 int type = cb->nlh->nlmsg_type-RTM_BASE;
1205 if (idx < s_idx || idx == PF_PACKET)
1206 continue;
1207 if (rtnl_msg_handlers[idx] == NULL ||
1208 rtnl_msg_handlers[idx][type].dumpit == NULL)
1209 continue;
1210 if (idx > s_idx)
1211 memset(&cb->args[0], 0, sizeof(cb->args));
1212 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1213 break;
1214 }
1215 cb->family = idx;
1216
1217 return skb->len;
1218 }
1219
1220 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1221 {
1222 struct sk_buff *skb;
1223 int err = -ENOBUFS;
1224
1225 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1226 if (skb == NULL)
1227 goto errout;
1228
1229 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1230 if (err < 0) {
1231 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1232 WARN_ON(err == -EMSGSIZE);
1233 kfree_skb(skb);
1234 goto errout;
1235 }
1236 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1237 errout:
1238 if (err < 0)
1239 rtnl_set_sk_err(RTNLGRP_LINK, err);
1240 }
1241
1242 /* Protected by RTNL sempahore. */
1243 static struct rtattr **rta_buf;
1244 static int rtattr_max;
1245
1246 /* Process one rtnetlink message. */
1247
1248 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1249 {
1250 rtnl_doit_func doit;
1251 int sz_idx, kind;
1252 int min_len;
1253 int family;
1254 int type;
1255 int err;
1256
1257 type = nlh->nlmsg_type;
1258 if (type > RTM_MAX)
1259 return -EOPNOTSUPP;
1260
1261 type -= RTM_BASE;
1262
1263 /* All the messages must have at least 1 byte length */
1264 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1265 return 0;
1266
1267 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1268 if (family >= NPROTO)
1269 return -EAFNOSUPPORT;
1270
1271 sz_idx = type>>2;
1272 kind = type&3;
1273
1274 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1275 return -EPERM;
1276
1277 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
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 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1286 rtnl_lock();
1287 return err;
1288 }
1289
1290 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1291
1292 min_len = rtm_min[sz_idx];
1293 if (nlh->nlmsg_len < min_len)
1294 return -EINVAL;
1295
1296 if (nlh->nlmsg_len > min_len) {
1297 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1298 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1299
1300 while (RTA_OK(attr, attrlen)) {
1301 unsigned flavor = attr->rta_type;
1302 if (flavor) {
1303 if (flavor > rta_max[sz_idx])
1304 return -EINVAL;
1305 rta_buf[flavor-1] = attr;
1306 }
1307 attr = RTA_NEXT(attr, attrlen);
1308 }
1309 }
1310
1311 doit = rtnl_get_doit(family, type);
1312 if (doit == NULL)
1313 return -EOPNOTSUPP;
1314
1315 return doit(skb, nlh, (void *)&rta_buf[0]);
1316 }
1317
1318 static void rtnetlink_rcv(struct sk_buff *skb)
1319 {
1320 rtnl_lock();
1321 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1322 rtnl_unlock();
1323 }
1324
1325 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1326 {
1327 struct net_device *dev = ptr;
1328
1329 if (dev->nd_net != &init_net)
1330 return NOTIFY_DONE;
1331
1332 switch (event) {
1333 case NETDEV_UNREGISTER:
1334 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1335 break;
1336 case NETDEV_REGISTER:
1337 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1338 break;
1339 case NETDEV_UP:
1340 case NETDEV_DOWN:
1341 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1342 break;
1343 case NETDEV_CHANGE:
1344 case NETDEV_GOING_DOWN:
1345 break;
1346 default:
1347 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1348 break;
1349 }
1350 return NOTIFY_DONE;
1351 }
1352
1353 static struct notifier_block rtnetlink_dev_notifier = {
1354 .notifier_call = rtnetlink_event,
1355 };
1356
1357 void __init rtnetlink_init(void)
1358 {
1359 int i;
1360
1361 rtattr_max = 0;
1362 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1363 if (rta_max[i] > rtattr_max)
1364 rtattr_max = rta_max[i];
1365 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1366 if (!rta_buf)
1367 panic("rtnetlink_init: cannot allocate rta_buf\n");
1368
1369 rtnl = netlink_kernel_create(&init_net, NETLINK_ROUTE, RTNLGRP_MAX,
1370 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1371 if (rtnl == NULL)
1372 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1373 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1374 register_netdevice_notifier(&rtnetlink_dev_notifier);
1375
1376 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1377 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1378 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1379 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1380
1381 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1382 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1383 }
1384
1385 EXPORT_SYMBOL(__rta_fill);
1386 EXPORT_SYMBOL(rtattr_strlcpy);
1387 EXPORT_SYMBOL(rtattr_parse);
1388 EXPORT_SYMBOL(__rtattr_parse_nested_compat);
1389 EXPORT_SYMBOL(rtnetlink_put_metrics);
1390 EXPORT_SYMBOL(rtnl_lock);
1391 EXPORT_SYMBOL(rtnl_trylock);
1392 EXPORT_SYMBOL(rtnl_unlock);
1393 EXPORT_SYMBOL(rtnl_unicast);
1394 EXPORT_SYMBOL(rtnl_notify);
1395 EXPORT_SYMBOL(rtnl_set_sk_err);
1396 EXPORT_SYMBOL(rtnl_create_link);
1397 EXPORT_SYMBOL(ifla_policy);
Linux kernel - Deliverables
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