blob: 52ea418d53021e717c20732d264076d6402894f1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/errno.h>
20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/socket.h>
23#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#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>
Stephen Hemminger6756ae42006-03-20 22:23:58 -080036#include <linux/mutex.h>
Thomas Graf18237302006-08-04 23:04:54 -070037#include <linux/if_addr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <asm/uaccess.h>
40#include <asm/system.h>
41#include <asm/string.h>
42
43#include <linux/inet.h>
44#include <linux/netdevice.h>
45#include <net/ip.h>
46#include <net/protocol.h>
47#include <net/arp.h>
48#include <net/route.h>
49#include <net/udp.h>
50#include <net/sock.h>
51#include <net/pkt_sched.h>
Thomas Graf14c0b972006-08-04 03:38:38 -070052#include <net/fib_rules.h>
Thomas Grafe2849862007-03-22 11:48:11 -070053#include <net/rtnetlink.h>
Johannes Berg30ffee82009-07-10 09:51:35 +000054#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Thomas Grafe2849862007-03-22 11:48:11 -070056struct rtnl_link
57{
58 rtnl_doit_func doit;
59 rtnl_dumpit_func dumpit;
60};
61
Stephen Hemminger6756ae42006-03-20 22:23:58 -080062static DEFINE_MUTEX(rtnl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64void rtnl_lock(void)
65{
Stephen Hemminger6756ae42006-03-20 22:23:58 -080066 mutex_lock(&rtnl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067}
68
Stephen Hemminger6756ae42006-03-20 22:23:58 -080069void __rtnl_unlock(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Stephen Hemminger6756ae42006-03-20 22:23:58 -080071 mutex_unlock(&rtnl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072}
Stephen Hemminger6756ae42006-03-20 22:23:58 -080073
Linus Torvalds1da177e2005-04-16 15:20:36 -070074void rtnl_unlock(void)
75{
Herbert Xu58ec3b42008-10-07 15:50:03 -070076 /* This fellow will unlock it for us. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 netdev_run_todo();
78}
79
Stephen Hemminger6756ae42006-03-20 22:23:58 -080080int rtnl_trylock(void)
81{
82 return mutex_trylock(&rtnl_mutex);
83}
84
Patrick McHardyc9c10142008-04-23 22:10:48 -070085int rtnl_is_locked(void)
86{
87 return mutex_is_locked(&rtnl_mutex);
88}
89
Adrian Bunk42bad1d2007-04-26 00:57:41 -070090static struct rtnl_link *rtnl_msg_handlers[NPROTO];
Thomas Grafe2849862007-03-22 11:48:11 -070091
92static 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
106static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
107{
108 struct rtnl_link *tab;
109
110 tab = rtnl_msg_handlers[protocol];
Thomas Graf51057f22007-03-22 21:41:06 -0700111 if (tab == NULL || tab[msgindex].doit == NULL)
Thomas Grafe2849862007-03-22 11:48:11 -0700112 tab = rtnl_msg_handlers[PF_UNSPEC];
113
Thomas Graf51057f22007-03-22 21:41:06 -0700114 return tab ? tab[msgindex].doit : NULL;
Thomas Grafe2849862007-03-22 11:48:11 -0700115}
116
117static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
118{
119 struct rtnl_link *tab;
120
121 tab = rtnl_msg_handlers[protocol];
Thomas Graf51057f22007-03-22 21:41:06 -0700122 if (tab == NULL || tab[msgindex].dumpit == NULL)
Thomas Grafe2849862007-03-22 11:48:11 -0700123 tab = rtnl_msg_handlers[PF_UNSPEC];
124
Thomas Graf51057f22007-03-22 21:41:06 -0700125 return tab ? tab[msgindex].dumpit : NULL;
Thomas Grafe2849862007-03-22 11:48:11 -0700126}
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 */
145int __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
172EXPORT_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 */
183void 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
192EXPORT_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 */
201int 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
217EXPORT_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 */
226void 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
234EXPORT_SYMBOL_GPL(rtnl_unregister_all);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Patrick McHardy38f7b872007-06-13 12:03:51 -0700236static 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 */
248int __rtnl_link_register(struct rtnl_link_ops *ops)
249{
Patrick McHardy2d85cba2007-07-11 19:42:13 -0700250 if (!ops->dellink)
251 ops->dellink = unregister_netdevice;
252
Patrick McHardy38f7b872007-06-13 12:03:51 -0700253 list_add_tail(&ops->list, &link_ops);
254 return 0;
255}
256
257EXPORT_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 */
265int 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
275EXPORT_SYMBOL_GPL(rtnl_link_register);
276
Pavel Emelyanov669f87b2008-04-16 00:46:52 -0700277static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
278{
279 struct net_device *dev;
280restart:
281 for_each_netdev(net, dev) {
282 if (dev->rtnl_link_ops == ops) {
283 ops->dellink(dev);
284 goto restart;
285 }
286 }
287}
288
289void 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}
295EXPORT_SYMBOL_GPL(rtnl_kill_links);
296
Patrick McHardy38f7b872007-06-13 12:03:51 -0700297/**
298 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
299 * @ops: struct rtnl_link_ops * to unregister
300 *
Patrick McHardy2d85cba2007-07-11 19:42:13 -0700301 * The caller must hold the rtnl_mutex.
Patrick McHardy38f7b872007-06-13 12:03:51 -0700302 */
303void __rtnl_link_unregister(struct rtnl_link_ops *ops)
304{
Eric W. Biederman881d9662007-09-17 11:56:21 -0700305 struct net *net;
Patrick McHardy2d85cba2007-07-11 19:42:13 -0700306
Eric W. Biederman881d9662007-09-17 11:56:21 -0700307 for_each_net(net) {
Pavel Emelyanov669f87b2008-04-16 00:46:52 -0700308 __rtnl_kill_links(net, ops);
Patrick McHardy2d85cba2007-07-11 19:42:13 -0700309 }
Patrick McHardy38f7b872007-06-13 12:03:51 -0700310 list_del(&ops->list);
311}
312
313EXPORT_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 */
319void rtnl_link_unregister(struct rtnl_link_ops *ops)
320{
321 rtnl_lock();
322 __rtnl_link_unregister(ops);
323 rtnl_unlock();
324}
325
326EXPORT_SYMBOL_GPL(rtnl_link_unregister);
327
328static 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
339static 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
361static 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
391err_cancel_data:
392 nla_nest_cancel(skb, data);
393err_cancel_link:
394 nla_nest_cancel(skb, linkinfo);
395out:
396 return err;
397}
398
Thomas Grafdb46edc2005-05-03 14:29:39 -0700399static const int rtm_min[RTM_NR_FAMILIES] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400{
Thomas Graff90a0a72005-05-03 14:29:00 -0700401 [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)),
Thomas Graf14c0b972006-08-04 03:38:38 -0700404 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
Thomas Graff90a0a72005-05-03 14:29:00 -0700405 [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)),
Thomas Graff90a0a72005-05-03 14:29:00 -0700409 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
410 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411};
412
Thomas Grafdb46edc2005-05-03 14:29:39 -0700413static const int rta_max[RTM_NR_FAMILIES] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414{
Thomas Graff90a0a72005-05-03 14:29:00 -0700415 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
416 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
417 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
Thomas Graf14c0b972006-08-04 03:38:38 -0700418 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
Thomas Graff90a0a72005-05-03 14:29:00 -0700419 [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,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423};
424
425void __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);
Patrick McHardyb3563c42005-06-28 12:54:43 -0700434 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435}
436
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800437int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438{
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800439 struct sock *rtnl = net->rtnl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 int err = 0;
441
Patrick McHardyac6d4392005-08-14 19:29:52 -0700442 NETLINK_CB(skb).dst_group = group;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 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
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800451int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
Thomas Graf2942e902006-08-15 00:30:25 -0700452{
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800453 struct sock *rtnl = net->rtnl;
454
Thomas Graf2942e902006-08-15 00:30:25 -0700455 return nlmsg_unicast(rtnl, skb, pid);
456}
457
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -0800458void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
459 struct nlmsghdr *nlh, gfp_t flags)
Thomas Graf97676b62006-08-15 00:31:41 -0700460{
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800461 struct sock *rtnl = net->rtnl;
Thomas Graf97676b62006-08-15 00:31:41 -0700462 int report = 0;
463
464 if (nlh)
465 report = nlmsg_report(nlh);
466
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -0800467 nlmsg_notify(rtnl, skb, pid, group, report, flags);
Thomas Graf97676b62006-08-15 00:31:41 -0700468}
469
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800470void rtnl_set_sk_err(struct net *net, u32 group, int error)
Thomas Graf97676b62006-08-15 00:31:41 -0700471{
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800472 struct sock *rtnl = net->rtnl;
473
Thomas Graf97676b62006-08-15 00:31:41 -0700474 netlink_set_err(rtnl, 0, group, error);
475}
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
478{
Thomas Graf2d7202b2006-08-22 00:01:27 -0700479 struct nlattr *mx;
480 int i, valid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
Thomas Graf2d7202b2006-08-22 00:01:27 -0700482 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
David S. Millera57d27f2006-08-22 22:20:14 -0700493 if (!valid) {
494 nla_nest_cancel(skb, mx);
495 return 0;
496 }
Thomas Graf2d7202b2006-08-22 00:01:27 -0700497
498 return nla_nest_end(skb, mx);
499
500nla_put_failure:
Thomas Grafbc3ed282008-06-03 16:36:54 -0700501 nla_nest_cancel(skb, mx);
502 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503}
504
Thomas Grafe3703b32006-11-27 09:27:07 -0800505int 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
524EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
David S. Miller93b2d4a2008-02-17 18:35:07 -0800526static void set_operstate(struct net_device *dev, unsigned char transition)
Stefan Rompfb00055a2006-03-20 17:09:11 -0800527{
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;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700543 }
Stefan Rompfb00055a2006-03-20 17:09:11 -0800544
545 if (dev->operstate != operstate) {
546 write_lock_bh(&dev_base_lock);
547 dev->operstate = operstate;
548 write_unlock_bh(&dev_base_lock);
David S. Miller93b2d4a2008-02-17 18:35:07 -0800549 netdev_state_change(dev);
550 }
Stefan Rompfb00055a2006-03-20 17:09:11 -0800551}
552
Thomas Grafb60c5112006-08-04 23:05:34 -0700553static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -0800554 const struct net_device_stats *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555{
Thomas Grafb60c5112006-08-04 23:05:34 -0700556 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Thomas Grafb60c5112006-08-04 23:05:34 -0700565 a->multicast = b->multicast;
566 a->collisions = b->collisions;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Thomas Grafb60c5112006-08-04 23:05:34 -0700568 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Thomas Grafb60c5112006-08-04 23:05:34 -0700575 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Thomas Grafb60c5112006-08-04 23:05:34 -0700581 a->rx_compressed = b->rx_compressed;
582 a->tx_compressed = b->tx_compressed;
583};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Patrick McHardy38f7b872007-06-13 12:03:51 -0700585static inline size_t if_nlmsg_size(const struct net_device *dev)
Thomas Graf339bf982006-11-10 14:10:15 -0800586{
587 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
588 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
Stephen Hemminger0b815a12008-09-22 21:28:11 -0700589 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
Thomas Graf339bf982006-11-10 14:10:15 -0800590 + 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 */
Patrick McHardy38f7b872007-06-13 12:03:51 -0700601 + nla_total_size(1) /* IFLA_LINKMODE */
602 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
Thomas Graf339bf982006-11-10 14:10:15 -0800603}
604
Thomas Grafb60c5112006-08-04 23:05:34 -0700605static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
Patrick McHardy575c3e22007-05-22 17:00:49 -0700606 int type, u32 pid, u32 seq, u32 change,
607 unsigned int flags)
Thomas Grafb60c5112006-08-04 23:05:34 -0700608{
609 struct ifinfomsg *ifm;
610 struct nlmsghdr *nlh;
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -0800611 const struct net_device_stats *stats;
Pavel Emelyanov96e74082008-05-21 14:12:46 -0700612 struct nlattr *attr;
Thomas Grafb60c5112006-08-04 23:05:34 -0700613
614 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
615 if (nlh == NULL)
Patrick McHardy26932562007-01-31 23:16:40 -0800616 return -EMSGSIZE;
Thomas Grafb60c5112006-08-04 23:05:34 -0700617
618 ifm = nlmsg_data(nlh);
619 ifm->ifi_family = AF_UNSPEC;
620 ifm->__ifi_pad = 0;
621 ifm->ifi_type = dev->type;
622 ifm->ifi_index = dev->ifindex;
623 ifm->ifi_flags = dev_get_flags(dev);
624 ifm->ifi_change = change;
625
626 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
627 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
Thomas Grafb60c5112006-08-04 23:05:34 -0700628 NLA_PUT_U8(skb, IFLA_OPERSTATE,
629 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
630 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
631 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
632
633 if (dev->ifindex != dev->iflink)
634 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
635
636 if (dev->master)
637 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
638
Patrick McHardyaf356af2009-09-04 06:41:18 +0000639 if (dev->qdisc)
640 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
Stefan Rompfb00055a2006-03-20 17:09:11 -0800641
Stephen Hemminger0b815a12008-09-22 21:28:11 -0700642 if (dev->ifalias)
643 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
644
Stefan Rompfb00055a2006-03-20 17:09:11 -0800645 if (1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 struct rtnl_link_ifmap map = {
647 .mem_start = dev->mem_start,
648 .mem_end = dev->mem_end,
649 .base_addr = dev->base_addr,
650 .irq = dev->irq,
651 .dma = dev->dma,
652 .port = dev->if_port,
653 };
Thomas Grafb60c5112006-08-04 23:05:34 -0700654 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 }
656
657 if (dev->addr_len) {
Thomas Grafb60c5112006-08-04 23:05:34 -0700658 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
659 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 }
661
Pavel Emelyanov96e74082008-05-21 14:12:46 -0700662 attr = nla_reserve(skb, IFLA_STATS,
663 sizeof(struct rtnl_link_stats));
664 if (attr == NULL)
665 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -0800667 stats = dev_get_stats(dev);
Pavel Emelyanov96e74082008-05-21 14:12:46 -0700668 copy_rtnl_link_stats(nla_data(attr), stats);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
Patrick McHardy38f7b872007-06-13 12:03:51 -0700670 if (dev->rtnl_link_ops) {
671 if (rtnl_link_fill(skb, dev) < 0)
672 goto nla_put_failure;
673 }
674
Thomas Grafb60c5112006-08-04 23:05:34 -0700675 return nlmsg_end(skb, nlh);
676
677nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -0800678 nlmsg_cancel(skb, nlh);
679 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680}
681
Thomas Grafb60c5112006-08-04 23:05:34 -0700682static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900684 struct net *net = sock_net(skb->sk);
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700685 int h, s_h;
686 int idx = 0, s_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 struct net_device *dev;
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700688 struct hlist_head *head;
689 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700691 s_h = cb->args[0];
692 s_idx = cb->args[1];
693
694 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
695 idx = 0;
696 head = &net->dev_index_head[h];
697 hlist_for_each_entry(dev, node, head, index_hlist) {
698 if (idx < s_idx)
699 goto cont;
700 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
701 NETLINK_CB(cb->skb).pid,
702 cb->nlh->nlmsg_seq, 0,
703 NLM_F_MULTI) <= 0)
704 goto out;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700705cont:
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700706 idx++;
707 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 }
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700709out:
710 cb->args[1] = idx;
711 cb->args[0] = h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 return skb->len;
714}
715
Pavel Emelianove7199282007-08-08 22:16:38 -0700716const struct nla_policy ifla_policy[IFLA_MAX+1] = {
Thomas Graf5176f912006-08-26 20:13:18 -0700717 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
Patrick McHardy38f7b872007-06-13 12:03:51 -0700718 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
719 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
Thomas Graf5176f912006-08-26 20:13:18 -0700720 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
Thomas Grafda5e0492006-08-10 21:17:37 -0700721 [IFLA_MTU] = { .type = NLA_U32 },
Thomas Graf76e87302008-02-19 16:12:08 -0800722 [IFLA_LINK] = { .type = NLA_U32 },
Thomas Grafda5e0492006-08-10 21:17:37 -0700723 [IFLA_TXQLEN] = { .type = NLA_U32 },
724 [IFLA_WEIGHT] = { .type = NLA_U32 },
725 [IFLA_OPERSTATE] = { .type = NLA_U8 },
726 [IFLA_LINKMODE] = { .type = NLA_U8 },
Thomas Graf76e87302008-02-19 16:12:08 -0800727 [IFLA_LINKINFO] = { .type = NLA_NESTED },
Eric W. Biedermand8a5ec62007-09-12 13:57:04 +0200728 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
Stephen Hemminger0b815a12008-09-22 21:28:11 -0700729 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
Thomas Grafda5e0492006-08-10 21:17:37 -0700730};
731
Patrick McHardy38f7b872007-06-13 12:03:51 -0700732static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
733 [IFLA_INFO_KIND] = { .type = NLA_STRING },
734 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
735};
736
Thomas Graf1840bb12008-02-23 19:54:36 -0800737static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
738{
739 if (dev) {
740 if (tb[IFLA_ADDRESS] &&
741 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
742 return -EINVAL;
743
744 if (tb[IFLA_BROADCAST] &&
745 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
746 return -EINVAL;
747 }
748
749 return 0;
750}
751
Patrick McHardy0157f602007-06-13 12:03:36 -0700752static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
Patrick McHardy38f7b872007-06-13 12:03:51 -0700753 struct nlattr **tb, char *ifname, int modified)
Patrick McHardy0157f602007-06-13 12:03:36 -0700754{
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800755 const struct net_device_ops *ops = dev->netdev_ops;
Patrick McHardy38f7b872007-06-13 12:03:51 -0700756 int send_addr_notify = 0;
Patrick McHardy0157f602007-06-13 12:03:36 -0700757 int err;
758
Eric W. Biedermand8a5ec62007-09-12 13:57:04 +0200759 if (tb[IFLA_NET_NS_PID]) {
760 struct net *net;
761 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
762 if (IS_ERR(net)) {
763 err = PTR_ERR(net);
764 goto errout;
765 }
766 err = dev_change_net_namespace(dev, net, ifname);
767 put_net(net);
768 if (err)
769 goto errout;
770 modified = 1;
771 }
772
Patrick McHardy0157f602007-06-13 12:03:36 -0700773 if (tb[IFLA_MAP]) {
774 struct rtnl_link_ifmap *u_map;
775 struct ifmap k_map;
776
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800777 if (!ops->ndo_set_config) {
Patrick McHardy0157f602007-06-13 12:03:36 -0700778 err = -EOPNOTSUPP;
779 goto errout;
780 }
781
782 if (!netif_device_present(dev)) {
783 err = -ENODEV;
784 goto errout;
785 }
786
787 u_map = nla_data(tb[IFLA_MAP]);
788 k_map.mem_start = (unsigned long) u_map->mem_start;
789 k_map.mem_end = (unsigned long) u_map->mem_end;
790 k_map.base_addr = (unsigned short) u_map->base_addr;
791 k_map.irq = (unsigned char) u_map->irq;
792 k_map.dma = (unsigned char) u_map->dma;
793 k_map.port = (unsigned char) u_map->port;
794
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800795 err = ops->ndo_set_config(dev, &k_map);
Patrick McHardy0157f602007-06-13 12:03:36 -0700796 if (err < 0)
797 goto errout;
798
799 modified = 1;
800 }
801
802 if (tb[IFLA_ADDRESS]) {
803 struct sockaddr *sa;
804 int len;
805
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800806 if (!ops->ndo_set_mac_address) {
Patrick McHardy0157f602007-06-13 12:03:36 -0700807 err = -EOPNOTSUPP;
808 goto errout;
809 }
810
811 if (!netif_device_present(dev)) {
812 err = -ENODEV;
813 goto errout;
814 }
815
816 len = sizeof(sa_family_t) + dev->addr_len;
817 sa = kmalloc(len, GFP_KERNEL);
818 if (!sa) {
819 err = -ENOMEM;
820 goto errout;
821 }
822 sa->sa_family = dev->type;
823 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
824 dev->addr_len);
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800825 err = ops->ndo_set_mac_address(dev, sa);
Patrick McHardy0157f602007-06-13 12:03:36 -0700826 kfree(sa);
827 if (err)
828 goto errout;
829 send_addr_notify = 1;
830 modified = 1;
831 }
832
833 if (tb[IFLA_MTU]) {
834 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
835 if (err < 0)
836 goto errout;
837 modified = 1;
838 }
839
840 /*
841 * Interface selected by interface index but interface
842 * name provided implies that a name change has been
843 * requested.
844 */
845 if (ifm->ifi_index > 0 && ifname[0]) {
846 err = dev_change_name(dev, ifname);
847 if (err < 0)
848 goto errout;
849 modified = 1;
850 }
851
Stephen Hemminger0b815a12008-09-22 21:28:11 -0700852 if (tb[IFLA_IFALIAS]) {
853 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
854 nla_len(tb[IFLA_IFALIAS]));
855 if (err < 0)
856 goto errout;
857 modified = 1;
858 }
859
Patrick McHardy0157f602007-06-13 12:03:36 -0700860 if (tb[IFLA_BROADCAST]) {
861 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
862 send_addr_notify = 1;
863 }
864
865 if (ifm->ifi_flags || ifm->ifi_change) {
866 unsigned int flags = ifm->ifi_flags;
867
868 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
869 if (ifm->ifi_change)
870 flags = (flags & ifm->ifi_change) |
871 (dev->flags & ~ifm->ifi_change);
Johannes Berg5f9021c2008-11-16 23:20:31 -0800872 err = dev_change_flags(dev, flags);
873 if (err < 0)
874 goto errout;
Patrick McHardy0157f602007-06-13 12:03:36 -0700875 }
876
David S. Miller93b2d4a2008-02-17 18:35:07 -0800877 if (tb[IFLA_TXQLEN])
878 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
Patrick McHardy0157f602007-06-13 12:03:36 -0700879
Patrick McHardy0157f602007-06-13 12:03:36 -0700880 if (tb[IFLA_OPERSTATE])
David S. Miller93b2d4a2008-02-17 18:35:07 -0800881 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
Patrick McHardy0157f602007-06-13 12:03:36 -0700882
883 if (tb[IFLA_LINKMODE]) {
David S. Miller93b2d4a2008-02-17 18:35:07 -0800884 write_lock_bh(&dev_base_lock);
885 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
886 write_unlock_bh(&dev_base_lock);
Patrick McHardy0157f602007-06-13 12:03:36 -0700887 }
888
889 err = 0;
890
891errout:
892 if (err < 0 && modified && net_ratelimit())
893 printk(KERN_WARNING "A link change request failed with "
894 "some changes comitted already. Interface %s may "
895 "have been left with an inconsistent configuration, "
896 "please check.\n", dev->name);
897
898 if (send_addr_notify)
899 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
900 return err;
901}
902
Thomas Grafda5e0492006-08-10 21:17:37 -0700903static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900905 struct net *net = sock_net(skb->sk);
Thomas Grafda5e0492006-08-10 21:17:37 -0700906 struct ifinfomsg *ifm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 struct net_device *dev;
Patrick McHardy0157f602007-06-13 12:03:36 -0700908 int err;
Thomas Grafda5e0492006-08-10 21:17:37 -0700909 struct nlattr *tb[IFLA_MAX+1];
910 char ifname[IFNAMSIZ];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
Thomas Grafda5e0492006-08-10 21:17:37 -0700912 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
913 if (err < 0)
914 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
Thomas Graf5176f912006-08-26 20:13:18 -0700916 if (tb[IFLA_IFNAME])
917 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
Patrick McHardy78e5b8912006-09-13 20:35:36 -0700918 else
919 ifname[0] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 err = -EINVAL;
Thomas Grafda5e0492006-08-10 21:17:37 -0700922 ifm = nlmsg_data(nlh);
Patrick McHardy51055be2007-06-05 12:40:01 -0700923 if (ifm->ifi_index > 0)
Eric Dumazeta3d12892009-10-21 10:59:31 +0000924 dev = __dev_get_by_index(net, ifm->ifi_index);
Thomas Grafda5e0492006-08-10 21:17:37 -0700925 else if (tb[IFLA_IFNAME])
Eric Dumazeta3d12892009-10-21 10:59:31 +0000926 dev = __dev_get_by_name(net, ifname);
Thomas Grafda5e0492006-08-10 21:17:37 -0700927 else
928 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
Thomas Grafda5e0492006-08-10 21:17:37 -0700930 if (dev == NULL) {
931 err = -ENODEV;
932 goto errout;
933 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
Thomas Graf1840bb12008-02-23 19:54:36 -0800935 if ((err = validate_linkmsg(dev, tb)) < 0)
Eric Dumazeta3d12892009-10-21 10:59:31 +0000936 goto errout;
Thomas Grafda5e0492006-08-10 21:17:37 -0700937
Patrick McHardy38f7b872007-06-13 12:03:51 -0700938 err = do_setlink(dev, ifm, tb, ifname, 0);
Thomas Grafda5e0492006-08-10 21:17:37 -0700939errout:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 return err;
941}
942
Patrick McHardy38f7b872007-06-13 12:03:51 -0700943static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
944{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900945 struct net *net = sock_net(skb->sk);
Patrick McHardy38f7b872007-06-13 12:03:51 -0700946 const struct rtnl_link_ops *ops;
947 struct net_device *dev;
948 struct ifinfomsg *ifm;
949 char ifname[IFNAMSIZ];
950 struct nlattr *tb[IFLA_MAX+1];
951 int err;
952
953 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
954 if (err < 0)
955 return err;
956
957 if (tb[IFLA_IFNAME])
958 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
959
960 ifm = nlmsg_data(nlh);
961 if (ifm->ifi_index > 0)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700962 dev = __dev_get_by_index(net, ifm->ifi_index);
Patrick McHardy38f7b872007-06-13 12:03:51 -0700963 else if (tb[IFLA_IFNAME])
Eric W. Biederman881d9662007-09-17 11:56:21 -0700964 dev = __dev_get_by_name(net, ifname);
Patrick McHardy38f7b872007-06-13 12:03:51 -0700965 else
966 return -EINVAL;
967
968 if (!dev)
969 return -ENODEV;
970
971 ops = dev->rtnl_link_ops;
972 if (!ops)
973 return -EOPNOTSUPP;
974
975 ops->dellink(dev);
976 return 0;
977}
978
Eric W. Biederman881d9662007-09-17 11:56:21 -0700979struct net_device *rtnl_create_link(struct net *net, char *ifname,
Pavel Emelianove7199282007-08-08 22:16:38 -0700980 const struct rtnl_link_ops *ops, struct nlattr *tb[])
981{
982 int err;
983 struct net_device *dev;
Eric Dumazet2e59af32009-09-02 18:03:00 -0700984 unsigned int num_queues = 1;
985 unsigned int real_num_queues = 1;
Pavel Emelianove7199282007-08-08 22:16:38 -0700986
Eric Dumazet2e59af32009-09-02 18:03:00 -0700987 if (ops->get_tx_queues) {
988 err = ops->get_tx_queues(net, tb, &num_queues, &real_num_queues);
989 if (err)
990 goto err;
991 }
Pavel Emelianove7199282007-08-08 22:16:38 -0700992 err = -ENOMEM;
Eric Dumazet2e59af32009-09-02 18:03:00 -0700993 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
Pavel Emelianove7199282007-08-08 22:16:38 -0700994 if (!dev)
995 goto err;
996
Eric Dumazet2e59af32009-09-02 18:03:00 -0700997 dev->real_num_tx_queues = real_num_queues;
Pavel Emelianove7199282007-08-08 22:16:38 -0700998 if (strchr(dev->name, '%')) {
999 err = dev_alloc_name(dev, dev->name);
1000 if (err < 0)
1001 goto err_free;
1002 }
1003
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001004 dev_net_set(dev, net);
Pavel Emelianove7199282007-08-08 22:16:38 -07001005 dev->rtnl_link_ops = ops;
1006
1007 if (tb[IFLA_MTU])
1008 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1009 if (tb[IFLA_ADDRESS])
1010 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1011 nla_len(tb[IFLA_ADDRESS]));
1012 if (tb[IFLA_BROADCAST])
1013 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1014 nla_len(tb[IFLA_BROADCAST]));
1015 if (tb[IFLA_TXQLEN])
1016 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1017 if (tb[IFLA_OPERSTATE])
David S. Miller93b2d4a2008-02-17 18:35:07 -08001018 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
Pavel Emelianove7199282007-08-08 22:16:38 -07001019 if (tb[IFLA_LINKMODE])
1020 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1021
1022 return dev;
1023
1024err_free:
1025 free_netdev(dev);
1026err:
1027 return ERR_PTR(err);
1028}
1029
Patrick McHardy38f7b872007-06-13 12:03:51 -07001030static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1031{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001032 struct net *net = sock_net(skb->sk);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001033 const struct rtnl_link_ops *ops;
1034 struct net_device *dev;
1035 struct ifinfomsg *ifm;
1036 char kind[MODULE_NAME_LEN];
1037 char ifname[IFNAMSIZ];
1038 struct nlattr *tb[IFLA_MAX+1];
1039 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1040 int err;
1041
Johannes Berg95a5afc2008-10-16 15:24:51 -07001042#ifdef CONFIG_MODULES
Patrick McHardy38f7b872007-06-13 12:03:51 -07001043replay:
Thomas Graf8072f082007-07-31 14:13:50 -07001044#endif
Patrick McHardy38f7b872007-06-13 12:03:51 -07001045 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1046 if (err < 0)
1047 return err;
1048
1049 if (tb[IFLA_IFNAME])
1050 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1051 else
1052 ifname[0] = '\0';
1053
1054 ifm = nlmsg_data(nlh);
1055 if (ifm->ifi_index > 0)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001056 dev = __dev_get_by_index(net, ifm->ifi_index);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001057 else if (ifname[0])
Eric W. Biederman881d9662007-09-17 11:56:21 -07001058 dev = __dev_get_by_name(net, ifname);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001059 else
1060 dev = NULL;
1061
Thomas Graf1840bb12008-02-23 19:54:36 -08001062 if ((err = validate_linkmsg(dev, tb)) < 0)
1063 return err;
1064
Patrick McHardy38f7b872007-06-13 12:03:51 -07001065 if (tb[IFLA_LINKINFO]) {
1066 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1067 tb[IFLA_LINKINFO], ifla_info_policy);
1068 if (err < 0)
1069 return err;
1070 } else
1071 memset(linkinfo, 0, sizeof(linkinfo));
1072
1073 if (linkinfo[IFLA_INFO_KIND]) {
1074 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1075 ops = rtnl_link_ops_get(kind);
1076 } else {
1077 kind[0] = '\0';
1078 ops = NULL;
1079 }
1080
1081 if (1) {
1082 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1083
1084 if (ops) {
1085 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1086 err = nla_parse_nested(attr, ops->maxtype,
1087 linkinfo[IFLA_INFO_DATA],
1088 ops->policy);
1089 if (err < 0)
1090 return err;
1091 data = attr;
1092 }
1093 if (ops->validate) {
1094 err = ops->validate(tb, data);
1095 if (err < 0)
1096 return err;
1097 }
1098 }
1099
1100 if (dev) {
1101 int modified = 0;
1102
1103 if (nlh->nlmsg_flags & NLM_F_EXCL)
1104 return -EEXIST;
1105 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1106 return -EOPNOTSUPP;
1107
1108 if (linkinfo[IFLA_INFO_DATA]) {
1109 if (!ops || ops != dev->rtnl_link_ops ||
1110 !ops->changelink)
1111 return -EOPNOTSUPP;
1112
1113 err = ops->changelink(dev, tb, data);
1114 if (err < 0)
1115 return err;
1116 modified = 1;
1117 }
1118
1119 return do_setlink(dev, ifm, tb, ifname, modified);
1120 }
1121
1122 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1123 return -ENODEV;
1124
1125 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1126 return -EOPNOTSUPP;
Patrick McHardy0e068772007-07-11 19:42:31 -07001127 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
Patrick McHardy38f7b872007-06-13 12:03:51 -07001128 return -EOPNOTSUPP;
1129
1130 if (!ops) {
Johannes Berg95a5afc2008-10-16 15:24:51 -07001131#ifdef CONFIG_MODULES
Patrick McHardy38f7b872007-06-13 12:03:51 -07001132 if (kind[0]) {
1133 __rtnl_unlock();
1134 request_module("rtnl-link-%s", kind);
1135 rtnl_lock();
1136 ops = rtnl_link_ops_get(kind);
1137 if (ops)
1138 goto replay;
1139 }
1140#endif
1141 return -EOPNOTSUPP;
1142 }
1143
1144 if (!ifname[0])
1145 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001146
Eric W. Biederman881d9662007-09-17 11:56:21 -07001147 dev = rtnl_create_link(net, ifname, ops, tb);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001148
Pavel Emelianove7199282007-08-08 22:16:38 -07001149 if (IS_ERR(dev))
1150 err = PTR_ERR(dev);
1151 else if (ops->newlink)
Patrick McHardy2d85cba2007-07-11 19:42:13 -07001152 err = ops->newlink(dev, tb, data);
1153 else
1154 err = register_netdevice(dev);
Pavel Emelianove7199282007-08-08 22:16:38 -07001155
1156 if (err < 0 && !IS_ERR(dev))
Patrick McHardy38f7b872007-06-13 12:03:51 -07001157 free_netdev(dev);
1158 return err;
1159 }
1160}
1161
Thomas Grafb60c5112006-08-04 23:05:34 -07001162static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001163{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001164 struct net *net = sock_net(skb->sk);
Thomas Grafb60c5112006-08-04 23:05:34 -07001165 struct ifinfomsg *ifm;
Eric Dumazeta3d12892009-10-21 10:59:31 +00001166 char ifname[IFNAMSIZ];
Thomas Grafb60c5112006-08-04 23:05:34 -07001167 struct nlattr *tb[IFLA_MAX+1];
1168 struct net_device *dev = NULL;
1169 struct sk_buff *nskb;
Thomas Graf339bf982006-11-10 14:10:15 -08001170 int err;
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001171
Thomas Grafb60c5112006-08-04 23:05:34 -07001172 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1173 if (err < 0)
Eric Sesterhenn9918f232006-09-26 23:26:38 -07001174 return err;
Thomas Grafb60c5112006-08-04 23:05:34 -07001175
Eric Dumazeta3d12892009-10-21 10:59:31 +00001176 if (tb[IFLA_IFNAME])
1177 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1178
Thomas Grafb60c5112006-08-04 23:05:34 -07001179 ifm = nlmsg_data(nlh);
Eric Dumazeta3d12892009-10-21 10:59:31 +00001180 if (ifm->ifi_index > 0)
1181 dev = __dev_get_by_index(net, ifm->ifi_index);
1182 else if (tb[IFLA_IFNAME])
1183 dev = __dev_get_by_name(net, ifname);
1184 else
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001185 return -EINVAL;
Thomas Grafb60c5112006-08-04 23:05:34 -07001186
Eric Dumazeta3d12892009-10-21 10:59:31 +00001187 if (dev == NULL)
1188 return -ENODEV;
1189
Patrick McHardy38f7b872007-06-13 12:03:51 -07001190 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
Eric Dumazeta3d12892009-10-21 10:59:31 +00001191 if (nskb == NULL)
1192 return -ENOBUFS;
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001193
Patrick McHardy575c3e22007-05-22 17:00:49 -07001194 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1195 nlh->nlmsg_seq, 0, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08001196 if (err < 0) {
1197 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1198 WARN_ON(err == -EMSGSIZE);
1199 kfree_skb(nskb);
Eric Dumazeta3d12892009-10-21 10:59:31 +00001200 } else
1201 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
Thomas Grafb60c5112006-08-04 23:05:34 -07001202
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001203 return err;
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001204}
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001205
Adrian Bunk42bad1d2007-04-26 00:57:41 -07001206static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207{
1208 int idx;
1209 int s_idx = cb->family;
1210
1211 if (s_idx == 0)
1212 s_idx = 1;
1213 for (idx=1; idx<NPROTO; idx++) {
1214 int type = cb->nlh->nlmsg_type-RTM_BASE;
1215 if (idx < s_idx || idx == PF_PACKET)
1216 continue;
Thomas Grafe2849862007-03-22 11:48:11 -07001217 if (rtnl_msg_handlers[idx] == NULL ||
1218 rtnl_msg_handlers[idx][type].dumpit == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 continue;
1220 if (idx > s_idx)
1221 memset(&cb->args[0], 0, sizeof(cb->args));
Thomas Grafe2849862007-03-22 11:48:11 -07001222 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 break;
1224 }
1225 cb->family = idx;
1226
1227 return skb->len;
1228}
1229
1230void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1231{
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001232 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 struct sk_buff *skb;
Thomas Graf0ec6d3f2006-08-15 00:37:09 -07001234 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
Patrick McHardy38f7b872007-06-13 12:03:51 -07001236 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
Thomas Graf0ec6d3f2006-08-15 00:37:09 -07001237 if (skb == NULL)
1238 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239
Patrick McHardy575c3e22007-05-22 17:00:49 -07001240 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08001241 if (err < 0) {
1242 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1243 WARN_ON(err == -EMSGSIZE);
1244 kfree_skb(skb);
1245 goto errout;
1246 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08001247 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1248 return;
Thomas Graf0ec6d3f2006-08-15 00:37:09 -07001249errout:
1250 if (err < 0)
Eric W. Biederman4b3da702007-11-19 22:27:40 -08001251 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252}
1253
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254/* Protected by RTNL sempahore. */
1255static struct rtattr **rta_buf;
1256static int rtattr_max;
1257
1258/* Process one rtnetlink message. */
1259
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001260static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001262 struct net *net = sock_net(skb->sk);
Thomas Grafe2849862007-03-22 11:48:11 -07001263 rtnl_doit_func doit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 int sz_idx, kind;
1265 int min_len;
1266 int family;
1267 int type;
Patrick McHardy1c2d6702007-04-16 16:59:10 -07001268 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 type = nlh->nlmsg_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 if (type > RTM_MAX)
Thomas Graf038890f2007-04-05 14:35:52 -07001272 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273
1274 type -= RTM_BASE;
1275
1276 /* All the messages must have at least 1 byte length */
1277 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1278 return 0;
1279
1280 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001281 if (family >= NPROTO)
1282 return -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 sz_idx = type>>2;
1285 kind = type&3;
1286
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001287 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1288 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289
1290 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001291 struct sock *rtnl;
Thomas Grafe2849862007-03-22 11:48:11 -07001292 rtnl_dumpit_func dumpit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293
Thomas Grafe2849862007-03-22 11:48:11 -07001294 dumpit = rtnl_get_dumpit(family, type);
1295 if (dumpit == NULL)
Thomas Graf038890f2007-04-05 14:35:52 -07001296 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297
Patrick McHardy1c2d6702007-04-16 16:59:10 -07001298 __rtnl_unlock();
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001299 rtnl = net->rtnl;
Patrick McHardy1c2d6702007-04-16 16:59:10 -07001300 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1301 rtnl_lock();
1302 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 }
1304
1305 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1306
1307 min_len = rtm_min[sz_idx];
1308 if (nlh->nlmsg_len < min_len)
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001309 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310
1311 if (nlh->nlmsg_len > min_len) {
1312 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1313 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1314
1315 while (RTA_OK(attr, attrlen)) {
1316 unsigned flavor = attr->rta_type;
1317 if (flavor) {
1318 if (flavor > rta_max[sz_idx])
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001319 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 rta_buf[flavor-1] = attr;
1321 }
1322 attr = RTA_NEXT(attr, attrlen);
1323 }
1324 }
1325
Thomas Grafe2849862007-03-22 11:48:11 -07001326 doit = rtnl_get_doit(family, type);
1327 if (doit == NULL)
Thomas Graf038890f2007-04-05 14:35:52 -07001328 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001330 return doit(skb, nlh, (void *)&rta_buf[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331}
1332
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001333static void rtnetlink_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334{
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001335 rtnl_lock();
1336 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1337 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338}
1339
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1341{
1342 struct net_device *dev = ptr;
Eric W. Biedermane9dc8652007-09-12 13:02:17 +02001343
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 switch (event) {
1345 case NETDEV_UNREGISTER:
1346 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1347 break;
1348 case NETDEV_REGISTER:
1349 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1350 break;
1351 case NETDEV_UP:
1352 case NETDEV_DOWN:
1353 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1354 break;
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
1365static struct notifier_block rtnetlink_dev_notifier = {
1366 .notifier_call = rtnetlink_event,
1367};
1368
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001369
1370static 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;
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001377 net->rtnl = sk;
1378 return 0;
1379}
1380
1381static void rtnetlink_net_exit(struct net *net)
1382{
Denis V. Lunev775516b2008-01-18 23:55:19 -08001383 netlink_kernel_release(net->rtnl);
1384 net->rtnl = NULL;
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001385}
1386
1387static struct pernet_operations rtnetlink_net_ops = {
1388 .init = rtnetlink_net_init,
1389 .exit = rtnetlink_net_exit,
1390};
1391
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392void __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
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001404 if (register_pernet_subsys(&rtnetlink_net_ops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 panic("rtnetlink_init: cannot initialize rtnetlink\n");
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001406
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1408 register_netdevice_notifier(&rtnetlink_dev_notifier);
Thomas Graf340d17f2007-03-22 11:49:22 -07001409
1410 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1411 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001412 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1413 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
Thomas Graf687ad8c2007-03-22 11:59:42 -07001414
1415 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1416 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417}
1418
1419EXPORT_SYMBOL(__rta_fill);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420EXPORT_SYMBOL(rtnetlink_put_metrics);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421EXPORT_SYMBOL(rtnl_lock);
Stephen Hemminger6756ae42006-03-20 22:23:58 -08001422EXPORT_SYMBOL(rtnl_trylock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423EXPORT_SYMBOL(rtnl_unlock);
Patrick McHardyc9c10142008-04-23 22:10:48 -07001424EXPORT_SYMBOL(rtnl_is_locked);
Thomas Graf2942e902006-08-15 00:30:25 -07001425EXPORT_SYMBOL(rtnl_unicast);
Thomas Graf97676b62006-08-15 00:31:41 -07001426EXPORT_SYMBOL(rtnl_notify);
1427EXPORT_SYMBOL(rtnl_set_sk_err);
Pavel Emelianove7199282007-08-08 22:16:38 -07001428EXPORT_SYMBOL(rtnl_create_link);
1429EXPORT_SYMBOL(ifla_policy);