blob: fe776c9ddecab809e68fabe202d24911950803df [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>
Williams, Mitch Aebc08a62010-02-10 01:44:05 +000038#include <linux/pci.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#include <asm/uaccess.h>
41#include <asm/system.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
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
Eric Dumazete0d087a2009-11-07 01:26:17 -080056struct rtnl_link {
Thomas Grafe2849862007-03-22 11:48:11 -070057 rtnl_doit_func doit;
58 rtnl_dumpit_func dumpit;
59};
60
Stephen Hemminger6756ae42006-03-20 22:23:58 -080061static DEFINE_MUTEX(rtnl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63void rtnl_lock(void)
64{
Stephen Hemminger6756ae42006-03-20 22:23:58 -080065 mutex_lock(&rtnl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066}
Eric Dumazete0d087a2009-11-07 01:26:17 -080067EXPORT_SYMBOL(rtnl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
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}
Eric Dumazete0d087a2009-11-07 01:26:17 -080079EXPORT_SYMBOL(rtnl_unlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Stephen Hemminger6756ae42006-03-20 22:23:58 -080081int rtnl_trylock(void)
82{
83 return mutex_trylock(&rtnl_mutex);
84}
Eric Dumazete0d087a2009-11-07 01:26:17 -080085EXPORT_SYMBOL(rtnl_trylock);
Stephen Hemminger6756ae42006-03-20 22:23:58 -080086
Patrick McHardyc9c10142008-04-23 22:10:48 -070087int rtnl_is_locked(void)
88{
89 return mutex_is_locked(&rtnl_mutex);
90}
Eric Dumazete0d087a2009-11-07 01:26:17 -080091EXPORT_SYMBOL(rtnl_is_locked);
Patrick McHardyc9c10142008-04-23 22:10:48 -070092
Paul E. McKenneya898def2010-02-22 17:04:49 -080093#ifdef CONFIG_PROVE_LOCKING
94int lockdep_rtnl_is_held(void)
95{
96 return lockdep_is_held(&rtnl_mutex);
97}
98EXPORT_SYMBOL(lockdep_rtnl_is_held);
99#endif /* #ifdef CONFIG_PROVE_LOCKING */
100
Adrian Bunk42bad1d2007-04-26 00:57:41 -0700101static struct rtnl_link *rtnl_msg_handlers[NPROTO];
Thomas Grafe2849862007-03-22 11:48:11 -0700102
103static inline int rtm_msgindex(int msgtype)
104{
105 int msgindex = msgtype - RTM_BASE;
106
107 /*
108 * msgindex < 0 implies someone tried to register a netlink
109 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
110 * the message type has not been added to linux/rtnetlink.h
111 */
112 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
113
114 return msgindex;
115}
116
117static rtnl_doit_func rtnl_get_doit(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].doit == 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].doit : NULL;
Thomas Grafe2849862007-03-22 11:48:11 -0700126}
127
128static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
129{
130 struct rtnl_link *tab;
131
132 tab = rtnl_msg_handlers[protocol];
Thomas Graf51057f22007-03-22 21:41:06 -0700133 if (tab == NULL || tab[msgindex].dumpit == NULL)
Thomas Grafe2849862007-03-22 11:48:11 -0700134 tab = rtnl_msg_handlers[PF_UNSPEC];
135
Thomas Graf51057f22007-03-22 21:41:06 -0700136 return tab ? tab[msgindex].dumpit : NULL;
Thomas Grafe2849862007-03-22 11:48:11 -0700137}
138
139/**
140 * __rtnl_register - Register a rtnetlink message type
141 * @protocol: Protocol family or PF_UNSPEC
142 * @msgtype: rtnetlink message type
143 * @doit: Function pointer called for each request message
144 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
145 *
146 * Registers the specified function pointers (at least one of them has
147 * to be non-NULL) to be called whenever a request message for the
148 * specified protocol family and message type is received.
149 *
150 * The special protocol family PF_UNSPEC may be used to define fallback
151 * function pointers for the case when no entry for the specific protocol
152 * family exists.
153 *
154 * Returns 0 on success or a negative error code.
155 */
156int __rtnl_register(int protocol, int msgtype,
157 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
158{
159 struct rtnl_link *tab;
160 int msgindex;
161
162 BUG_ON(protocol < 0 || protocol >= NPROTO);
163 msgindex = rtm_msgindex(msgtype);
164
165 tab = rtnl_msg_handlers[protocol];
166 if (tab == NULL) {
167 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
168 if (tab == NULL)
169 return -ENOBUFS;
170
171 rtnl_msg_handlers[protocol] = tab;
172 }
173
174 if (doit)
175 tab[msgindex].doit = doit;
176
177 if (dumpit)
178 tab[msgindex].dumpit = dumpit;
179
180 return 0;
181}
Thomas Grafe2849862007-03-22 11:48:11 -0700182EXPORT_SYMBOL_GPL(__rtnl_register);
183
184/**
185 * rtnl_register - Register a rtnetlink message type
186 *
187 * Identical to __rtnl_register() but panics on failure. This is useful
188 * as failure of this function is very unlikely, it can only happen due
189 * to lack of memory when allocating the chain to store all message
190 * handlers for a protocol. Meant for use in init functions where lack
191 * of memory implies no sense in continueing.
192 */
193void rtnl_register(int protocol, int msgtype,
194 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
195{
196 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
197 panic("Unable to register rtnetlink message handler, "
198 "protocol = %d, message type = %d\n",
199 protocol, msgtype);
200}
Thomas Grafe2849862007-03-22 11:48:11 -0700201EXPORT_SYMBOL_GPL(rtnl_register);
202
203/**
204 * rtnl_unregister - Unregister a rtnetlink message type
205 * @protocol: Protocol family or PF_UNSPEC
206 * @msgtype: rtnetlink message type
207 *
208 * Returns 0 on success or a negative error code.
209 */
210int rtnl_unregister(int protocol, int msgtype)
211{
212 int msgindex;
213
214 BUG_ON(protocol < 0 || protocol >= NPROTO);
215 msgindex = rtm_msgindex(msgtype);
216
217 if (rtnl_msg_handlers[protocol] == NULL)
218 return -ENOENT;
219
220 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
221 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
222
223 return 0;
224}
Thomas Grafe2849862007-03-22 11:48:11 -0700225EXPORT_SYMBOL_GPL(rtnl_unregister);
226
227/**
228 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
229 * @protocol : Protocol family or PF_UNSPEC
230 *
231 * Identical to calling rtnl_unregster() for all registered message types
232 * of a certain protocol family.
233 */
234void rtnl_unregister_all(int protocol)
235{
236 BUG_ON(protocol < 0 || protocol >= NPROTO);
237
238 kfree(rtnl_msg_handlers[protocol]);
239 rtnl_msg_handlers[protocol] = NULL;
240}
Thomas Grafe2849862007-03-22 11:48:11 -0700241EXPORT_SYMBOL_GPL(rtnl_unregister_all);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
Patrick McHardy38f7b872007-06-13 12:03:51 -0700243static LIST_HEAD(link_ops);
244
245/**
246 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
247 * @ops: struct rtnl_link_ops * to register
248 *
249 * The caller must hold the rtnl_mutex. This function should be used
250 * by drivers that create devices during module initialization. It
251 * must be called before registering the devices.
252 *
253 * Returns 0 on success or a negative error code.
254 */
255int __rtnl_link_register(struct rtnl_link_ops *ops)
256{
Patrick McHardy2d85cba2007-07-11 19:42:13 -0700257 if (!ops->dellink)
Eric Dumazet23289a32009-10-27 07:06:36 +0000258 ops->dellink = unregister_netdevice_queue;
Patrick McHardy2d85cba2007-07-11 19:42:13 -0700259
Patrick McHardy38f7b872007-06-13 12:03:51 -0700260 list_add_tail(&ops->list, &link_ops);
261 return 0;
262}
Patrick McHardy38f7b872007-06-13 12:03:51 -0700263EXPORT_SYMBOL_GPL(__rtnl_link_register);
264
265/**
266 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
267 * @ops: struct rtnl_link_ops * to register
268 *
269 * Returns 0 on success or a negative error code.
270 */
271int rtnl_link_register(struct rtnl_link_ops *ops)
272{
273 int err;
274
275 rtnl_lock();
276 err = __rtnl_link_register(ops);
277 rtnl_unlock();
278 return err;
279}
Patrick McHardy38f7b872007-06-13 12:03:51 -0700280EXPORT_SYMBOL_GPL(rtnl_link_register);
281
Pavel Emelyanov669f87b2008-04-16 00:46:52 -0700282static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
283{
284 struct net_device *dev;
Eric Dumazet23289a32009-10-27 07:06:36 +0000285 LIST_HEAD(list_kill);
286
Pavel Emelyanov669f87b2008-04-16 00:46:52 -0700287 for_each_netdev(net, dev) {
Eric Dumazet23289a32009-10-27 07:06:36 +0000288 if (dev->rtnl_link_ops == ops)
289 ops->dellink(dev, &list_kill);
Pavel Emelyanov669f87b2008-04-16 00:46:52 -0700290 }
Eric Dumazet23289a32009-10-27 07:06:36 +0000291 unregister_netdevice_many(&list_kill);
Pavel Emelyanov669f87b2008-04-16 00:46:52 -0700292}
293
294void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
295{
296 rtnl_lock();
297 __rtnl_kill_links(net, ops);
298 rtnl_unlock();
299}
300EXPORT_SYMBOL_GPL(rtnl_kill_links);
301
Patrick McHardy38f7b872007-06-13 12:03:51 -0700302/**
303 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
304 * @ops: struct rtnl_link_ops * to unregister
305 *
Patrick McHardy2d85cba2007-07-11 19:42:13 -0700306 * The caller must hold the rtnl_mutex.
Patrick McHardy38f7b872007-06-13 12:03:51 -0700307 */
308void __rtnl_link_unregister(struct rtnl_link_ops *ops)
309{
Eric W. Biederman881d9662007-09-17 11:56:21 -0700310 struct net *net;
Patrick McHardy2d85cba2007-07-11 19:42:13 -0700311
Eric W. Biederman881d9662007-09-17 11:56:21 -0700312 for_each_net(net) {
Pavel Emelyanov669f87b2008-04-16 00:46:52 -0700313 __rtnl_kill_links(net, ops);
Patrick McHardy2d85cba2007-07-11 19:42:13 -0700314 }
Patrick McHardy38f7b872007-06-13 12:03:51 -0700315 list_del(&ops->list);
316}
Patrick McHardy38f7b872007-06-13 12:03:51 -0700317EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
318
319/**
320 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
321 * @ops: struct rtnl_link_ops * to unregister
322 */
323void rtnl_link_unregister(struct rtnl_link_ops *ops)
324{
325 rtnl_lock();
326 __rtnl_link_unregister(ops);
327 rtnl_unlock();
328}
Patrick McHardy38f7b872007-06-13 12:03:51 -0700329EXPORT_SYMBOL_GPL(rtnl_link_unregister);
330
331static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
332{
333 const struct rtnl_link_ops *ops;
334
335 list_for_each_entry(ops, &link_ops, list) {
336 if (!strcmp(ops->kind, kind))
337 return ops;
338 }
339 return NULL;
340}
341
342static size_t rtnl_link_get_size(const struct net_device *dev)
343{
344 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
345 size_t size;
346
347 if (!ops)
348 return 0;
349
350 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
351 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
352
353 if (ops->get_size)
354 /* IFLA_INFO_DATA + nested data */
355 size += nlmsg_total_size(sizeof(struct nlattr)) +
356 ops->get_size(dev);
357
358 if (ops->get_xstats_size)
359 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
360
361 return size;
362}
363
364static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
365{
366 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
367 struct nlattr *linkinfo, *data;
368 int err = -EMSGSIZE;
369
370 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
371 if (linkinfo == NULL)
372 goto out;
373
374 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
375 goto err_cancel_link;
376 if (ops->fill_xstats) {
377 err = ops->fill_xstats(skb, dev);
378 if (err < 0)
379 goto err_cancel_link;
380 }
381 if (ops->fill_info) {
382 data = nla_nest_start(skb, IFLA_INFO_DATA);
383 if (data == NULL)
384 goto err_cancel_link;
385 err = ops->fill_info(skb, dev);
386 if (err < 0)
387 goto err_cancel_data;
388 nla_nest_end(skb, data);
389 }
390
391 nla_nest_end(skb, linkinfo);
392 return 0;
393
394err_cancel_data:
395 nla_nest_cancel(skb, data);
396err_cancel_link:
397 nla_nest_cancel(skb, linkinfo);
398out:
399 return err;
400}
401
Thomas Grafdb46edc2005-05-03 14:29:39 -0700402static const int rtm_min[RTM_NR_FAMILIES] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403{
Thomas Graff90a0a72005-05-03 14:29:00 -0700404 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
405 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
406 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
Thomas Graf14c0b972006-08-04 03:38:38 -0700407 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
Thomas Graff90a0a72005-05-03 14:29:00 -0700408 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
409 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
410 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
411 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
Thomas Graff90a0a72005-05-03 14:29:00 -0700412 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
413 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414};
415
Thomas Grafdb46edc2005-05-03 14:29:39 -0700416static const int rta_max[RTM_NR_FAMILIES] =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417{
Thomas Graff90a0a72005-05-03 14:29:00 -0700418 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
419 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
420 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
Thomas Graf14c0b972006-08-04 03:38:38 -0700421 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
Thomas Graff90a0a72005-05-03 14:29:00 -0700422 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
423 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
424 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
425 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426};
427
428void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
429{
430 struct rtattr *rta;
431 int size = RTA_LENGTH(attrlen);
432
Eric Dumazete0d087a2009-11-07 01:26:17 -0800433 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 rta->rta_type = attrtype;
435 rta->rta_len = size;
436 memcpy(RTA_DATA(rta), data, attrlen);
Patrick McHardyb3563c42005-06-28 12:54:43 -0700437 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438}
Eric Dumazete0d087a2009-11-07 01:26:17 -0800439EXPORT_SYMBOL(__rta_fill);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800441int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800443 struct sock *rtnl = net->rtnl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 int err = 0;
445
Patrick McHardyac6d4392005-08-14 19:29:52 -0700446 NETLINK_CB(skb).dst_group = group;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 if (echo)
448 atomic_inc(&skb->users);
449 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
450 if (echo)
451 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
452 return err;
453}
454
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800455int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
Thomas Graf2942e902006-08-15 00:30:25 -0700456{
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800457 struct sock *rtnl = net->rtnl;
458
Thomas Graf2942e902006-08-15 00:30:25 -0700459 return nlmsg_unicast(rtnl, skb, pid);
460}
Eric Dumazete0d087a2009-11-07 01:26:17 -0800461EXPORT_SYMBOL(rtnl_unicast);
Thomas Graf2942e902006-08-15 00:30:25 -0700462
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -0800463void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
464 struct nlmsghdr *nlh, gfp_t flags)
Thomas Graf97676b62006-08-15 00:31:41 -0700465{
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800466 struct sock *rtnl = net->rtnl;
Thomas Graf97676b62006-08-15 00:31:41 -0700467 int report = 0;
468
469 if (nlh)
470 report = nlmsg_report(nlh);
471
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -0800472 nlmsg_notify(rtnl, skb, pid, group, report, flags);
Thomas Graf97676b62006-08-15 00:31:41 -0700473}
Eric Dumazete0d087a2009-11-07 01:26:17 -0800474EXPORT_SYMBOL(rtnl_notify);
Thomas Graf97676b62006-08-15 00:31:41 -0700475
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800476void rtnl_set_sk_err(struct net *net, u32 group, int error)
Thomas Graf97676b62006-08-15 00:31:41 -0700477{
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800478 struct sock *rtnl = net->rtnl;
479
Thomas Graf97676b62006-08-15 00:31:41 -0700480 netlink_set_err(rtnl, 0, group, error);
481}
Eric Dumazete0d087a2009-11-07 01:26:17 -0800482EXPORT_SYMBOL(rtnl_set_sk_err);
Thomas Graf97676b62006-08-15 00:31:41 -0700483
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
485{
Thomas Graf2d7202b2006-08-22 00:01:27 -0700486 struct nlattr *mx;
487 int i, valid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
Thomas Graf2d7202b2006-08-22 00:01:27 -0700489 mx = nla_nest_start(skb, RTA_METRICS);
490 if (mx == NULL)
491 return -ENOBUFS;
492
493 for (i = 0; i < RTAX_MAX; i++) {
494 if (metrics[i]) {
495 valid++;
496 NLA_PUT_U32(skb, i+1, metrics[i]);
497 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
David S. Millera57d27f2006-08-22 22:20:14 -0700500 if (!valid) {
501 nla_nest_cancel(skb, mx);
502 return 0;
503 }
Thomas Graf2d7202b2006-08-22 00:01:27 -0700504
505 return nla_nest_end(skb, mx);
506
507nla_put_failure:
Thomas Grafbc3ed282008-06-03 16:36:54 -0700508 nla_nest_cancel(skb, mx);
509 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510}
Eric Dumazete0d087a2009-11-07 01:26:17 -0800511EXPORT_SYMBOL(rtnetlink_put_metrics);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
Thomas Grafe3703b32006-11-27 09:27:07 -0800513int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
514 u32 ts, u32 tsage, long expires, u32 error)
515{
516 struct rta_cacheinfo ci = {
517 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
518 .rta_used = dst->__use,
519 .rta_clntref = atomic_read(&(dst->__refcnt)),
520 .rta_error = error,
521 .rta_id = id,
522 .rta_ts = ts,
523 .rta_tsage = tsage,
524 };
525
526 if (expires)
527 ci.rta_expires = jiffies_to_clock_t(expires);
528
529 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
530}
Thomas Grafe3703b32006-11-27 09:27:07 -0800531EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
David S. Miller93b2d4a2008-02-17 18:35:07 -0800533static void set_operstate(struct net_device *dev, unsigned char transition)
Stefan Rompfb00055a2006-03-20 17:09:11 -0800534{
535 unsigned char operstate = dev->operstate;
536
Eric Dumazete0d087a2009-11-07 01:26:17 -0800537 switch (transition) {
Stefan Rompfb00055a2006-03-20 17:09:11 -0800538 case IF_OPER_UP:
539 if ((operstate == IF_OPER_DORMANT ||
540 operstate == IF_OPER_UNKNOWN) &&
541 !netif_dormant(dev))
542 operstate = IF_OPER_UP;
543 break;
544
545 case IF_OPER_DORMANT:
546 if (operstate == IF_OPER_UP ||
547 operstate == IF_OPER_UNKNOWN)
548 operstate = IF_OPER_DORMANT;
549 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700550 }
Stefan Rompfb00055a2006-03-20 17:09:11 -0800551
552 if (dev->operstate != operstate) {
553 write_lock_bh(&dev_base_lock);
554 dev->operstate = operstate;
555 write_unlock_bh(&dev_base_lock);
David S. Miller93b2d4a2008-02-17 18:35:07 -0800556 netdev_state_change(dev);
557 }
Stefan Rompfb00055a2006-03-20 17:09:11 -0800558}
559
Patrick McHardy3729d502010-02-26 06:34:54 +0000560static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
561 const struct ifinfomsg *ifm)
562{
563 unsigned int flags = ifm->ifi_flags;
564
565 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
566 if (ifm->ifi_change)
567 flags = (flags & ifm->ifi_change) |
568 (dev->flags & ~ifm->ifi_change);
569
570 return flags;
571}
572
Thomas Grafb60c5112006-08-04 23:05:34 -0700573static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -0800574 const struct net_device_stats *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575{
Thomas Grafb60c5112006-08-04 23:05:34 -0700576 a->rx_packets = b->rx_packets;
577 a->tx_packets = b->tx_packets;
578 a->rx_bytes = b->rx_bytes;
579 a->tx_bytes = b->tx_bytes;
580 a->rx_errors = b->rx_errors;
581 a->tx_errors = b->tx_errors;
582 a->rx_dropped = b->rx_dropped;
583 a->tx_dropped = b->tx_dropped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Thomas Grafb60c5112006-08-04 23:05:34 -0700585 a->multicast = b->multicast;
586 a->collisions = b->collisions;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
Thomas Grafb60c5112006-08-04 23:05:34 -0700588 a->rx_length_errors = b->rx_length_errors;
589 a->rx_over_errors = b->rx_over_errors;
590 a->rx_crc_errors = b->rx_crc_errors;
591 a->rx_frame_errors = b->rx_frame_errors;
592 a->rx_fifo_errors = b->rx_fifo_errors;
593 a->rx_missed_errors = b->rx_missed_errors;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
Thomas Grafb60c5112006-08-04 23:05:34 -0700595 a->tx_aborted_errors = b->tx_aborted_errors;
596 a->tx_carrier_errors = b->tx_carrier_errors;
597 a->tx_fifo_errors = b->tx_fifo_errors;
598 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
599 a->tx_window_errors = b->tx_window_errors;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
Thomas Grafb60c5112006-08-04 23:05:34 -0700601 a->rx_compressed = b->rx_compressed;
602 a->tx_compressed = b->tx_compressed;
603};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000605static inline int rtnl_vfinfo_size(const struct net_device *dev)
606{
607 if (dev->dev.parent && dev_is_pci(dev->dev.parent))
608 return dev_num_vf(dev->dev.parent) *
609 sizeof(struct ifla_vf_info);
610 else
611 return 0;
612}
613
Patrick McHardy38f7b872007-06-13 12:03:51 -0700614static inline size_t if_nlmsg_size(const struct net_device *dev)
Thomas Graf339bf982006-11-10 14:10:15 -0800615{
616 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
617 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
Stephen Hemminger0b815a12008-09-22 21:28:11 -0700618 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
Thomas Graf339bf982006-11-10 14:10:15 -0800619 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
620 + nla_total_size(sizeof(struct rtnl_link_ifmap))
621 + nla_total_size(sizeof(struct rtnl_link_stats))
622 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
623 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
624 + nla_total_size(4) /* IFLA_TXQLEN */
625 + nla_total_size(4) /* IFLA_WEIGHT */
626 + nla_total_size(4) /* IFLA_MTU */
627 + nla_total_size(4) /* IFLA_LINK */
628 + nla_total_size(4) /* IFLA_MASTER */
629 + nla_total_size(1) /* IFLA_OPERSTATE */
Patrick McHardy38f7b872007-06-13 12:03:51 -0700630 + nla_total_size(1) /* IFLA_LINKMODE */
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000631 + nla_total_size(4) /* IFLA_NUM_VF */
632 + nla_total_size(rtnl_vfinfo_size(dev)) /* IFLA_VFINFO */
Patrick McHardy38f7b872007-06-13 12:03:51 -0700633 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
Thomas Graf339bf982006-11-10 14:10:15 -0800634}
635
Thomas Grafb60c5112006-08-04 23:05:34 -0700636static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
Patrick McHardy575c3e22007-05-22 17:00:49 -0700637 int type, u32 pid, u32 seq, u32 change,
638 unsigned int flags)
Thomas Grafb60c5112006-08-04 23:05:34 -0700639{
640 struct ifinfomsg *ifm;
641 struct nlmsghdr *nlh;
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -0800642 const struct net_device_stats *stats;
Pavel Emelyanov96e74082008-05-21 14:12:46 -0700643 struct nlattr *attr;
Thomas Grafb60c5112006-08-04 23:05:34 -0700644
645 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
646 if (nlh == NULL)
Patrick McHardy26932562007-01-31 23:16:40 -0800647 return -EMSGSIZE;
Thomas Grafb60c5112006-08-04 23:05:34 -0700648
649 ifm = nlmsg_data(nlh);
650 ifm->ifi_family = AF_UNSPEC;
651 ifm->__ifi_pad = 0;
652 ifm->ifi_type = dev->type;
653 ifm->ifi_index = dev->ifindex;
654 ifm->ifi_flags = dev_get_flags(dev);
655 ifm->ifi_change = change;
656
657 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
658 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
Thomas Grafb60c5112006-08-04 23:05:34 -0700659 NLA_PUT_U8(skb, IFLA_OPERSTATE,
660 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
661 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
662 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
663
664 if (dev->ifindex != dev->iflink)
665 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
666
667 if (dev->master)
668 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
669
Patrick McHardyaf356af2009-09-04 06:41:18 +0000670 if (dev->qdisc)
671 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
Stefan Rompfb00055a2006-03-20 17:09:11 -0800672
Stephen Hemminger0b815a12008-09-22 21:28:11 -0700673 if (dev->ifalias)
674 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
675
Stefan Rompfb00055a2006-03-20 17:09:11 -0800676 if (1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 struct rtnl_link_ifmap map = {
678 .mem_start = dev->mem_start,
679 .mem_end = dev->mem_end,
680 .base_addr = dev->base_addr,
681 .irq = dev->irq,
682 .dma = dev->dma,
683 .port = dev->if_port,
684 };
Thomas Grafb60c5112006-08-04 23:05:34 -0700685 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 }
687
688 if (dev->addr_len) {
Thomas Grafb60c5112006-08-04 23:05:34 -0700689 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
690 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 }
692
Pavel Emelyanov96e74082008-05-21 14:12:46 -0700693 attr = nla_reserve(skb, IFLA_STATS,
694 sizeof(struct rtnl_link_stats));
695 if (attr == NULL)
696 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
Stephen Hemmingereeda3fd2008-11-19 21:40:23 -0800698 stats = dev_get_stats(dev);
Pavel Emelyanov96e74082008-05-21 14:12:46 -0700699 copy_rtnl_link_stats(nla_data(attr), stats);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000701 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
702 int i;
703 struct ifla_vf_info ivi;
704
705 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
706 for (i = 0; i < dev_num_vf(dev->dev.parent); i++) {
707 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
708 break;
709 NLA_PUT(skb, IFLA_VFINFO, sizeof(ivi), &ivi);
710 }
711 }
Patrick McHardy38f7b872007-06-13 12:03:51 -0700712 if (dev->rtnl_link_ops) {
713 if (rtnl_link_fill(skb, dev) < 0)
714 goto nla_put_failure;
715 }
716
Thomas Grafb60c5112006-08-04 23:05:34 -0700717 return nlmsg_end(skb, nlh);
718
719nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -0800720 nlmsg_cancel(skb, nlh);
721 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722}
723
Thomas Grafb60c5112006-08-04 23:05:34 -0700724static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900726 struct net *net = sock_net(skb->sk);
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700727 int h, s_h;
728 int idx = 0, s_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 struct net_device *dev;
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700730 struct hlist_head *head;
731 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700733 s_h = cb->args[0];
734 s_idx = cb->args[1];
735
736 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
737 idx = 0;
738 head = &net->dev_index_head[h];
739 hlist_for_each_entry(dev, node, head, index_hlist) {
740 if (idx < s_idx)
741 goto cont;
742 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
743 NETLINK_CB(cb->skb).pid,
744 cb->nlh->nlmsg_seq, 0,
745 NLM_F_MULTI) <= 0)
746 goto out;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700747cont:
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700748 idx++;
749 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 }
Eric Dumazet7c28bd02009-10-24 06:13:17 -0700751out:
752 cb->args[1] = idx;
753 cb->args[0] = h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
755 return skb->len;
756}
757
Pavel Emelianove7199282007-08-08 22:16:38 -0700758const struct nla_policy ifla_policy[IFLA_MAX+1] = {
Thomas Graf5176f912006-08-26 20:13:18 -0700759 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
Patrick McHardy38f7b872007-06-13 12:03:51 -0700760 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
761 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
Thomas Graf5176f912006-08-26 20:13:18 -0700762 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
Thomas Grafda5e0492006-08-10 21:17:37 -0700763 [IFLA_MTU] = { .type = NLA_U32 },
Thomas Graf76e87302008-02-19 16:12:08 -0800764 [IFLA_LINK] = { .type = NLA_U32 },
Thomas Grafda5e0492006-08-10 21:17:37 -0700765 [IFLA_TXQLEN] = { .type = NLA_U32 },
766 [IFLA_WEIGHT] = { .type = NLA_U32 },
767 [IFLA_OPERSTATE] = { .type = NLA_U8 },
768 [IFLA_LINKMODE] = { .type = NLA_U8 },
Thomas Graf76e87302008-02-19 16:12:08 -0800769 [IFLA_LINKINFO] = { .type = NLA_NESTED },
Eric W. Biedermand8a5ec62007-09-12 13:57:04 +0200770 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
Stephen Hemminger0b815a12008-09-22 21:28:11 -0700771 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000772 [IFLA_VF_MAC] = { .type = NLA_BINARY,
773 .len = sizeof(struct ifla_vf_mac) },
774 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
775 .len = sizeof(struct ifla_vf_vlan) },
776 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
777 .len = sizeof(struct ifla_vf_tx_rate) },
Thomas Grafda5e0492006-08-10 21:17:37 -0700778};
Eric Dumazete0d087a2009-11-07 01:26:17 -0800779EXPORT_SYMBOL(ifla_policy);
Thomas Grafda5e0492006-08-10 21:17:37 -0700780
Patrick McHardy38f7b872007-06-13 12:03:51 -0700781static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
782 [IFLA_INFO_KIND] = { .type = NLA_STRING },
783 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
784};
785
Eric W. Biederman81adee42009-11-08 00:53:51 -0800786struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
787{
788 struct net *net;
789 /* Examine the link attributes and figure out which
790 * network namespace we are talking about.
791 */
792 if (tb[IFLA_NET_NS_PID])
793 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
794 else
795 net = get_net(src_net);
796 return net;
797}
798EXPORT_SYMBOL(rtnl_link_get_net);
799
Thomas Graf1840bb12008-02-23 19:54:36 -0800800static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
801{
802 if (dev) {
803 if (tb[IFLA_ADDRESS] &&
804 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
805 return -EINVAL;
806
807 if (tb[IFLA_BROADCAST] &&
808 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
809 return -EINVAL;
810 }
811
812 return 0;
813}
814
Patrick McHardy0157f602007-06-13 12:03:36 -0700815static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
Patrick McHardy38f7b872007-06-13 12:03:51 -0700816 struct nlattr **tb, char *ifname, int modified)
Patrick McHardy0157f602007-06-13 12:03:36 -0700817{
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800818 const struct net_device_ops *ops = dev->netdev_ops;
Patrick McHardy38f7b872007-06-13 12:03:51 -0700819 int send_addr_notify = 0;
Patrick McHardy0157f602007-06-13 12:03:36 -0700820 int err;
821
Eric W. Biedermand8a5ec62007-09-12 13:57:04 +0200822 if (tb[IFLA_NET_NS_PID]) {
Eric W. Biederman81adee42009-11-08 00:53:51 -0800823 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
Eric W. Biedermand8a5ec62007-09-12 13:57:04 +0200824 if (IS_ERR(net)) {
825 err = PTR_ERR(net);
826 goto errout;
827 }
828 err = dev_change_net_namespace(dev, net, ifname);
829 put_net(net);
830 if (err)
831 goto errout;
832 modified = 1;
833 }
834
Patrick McHardy0157f602007-06-13 12:03:36 -0700835 if (tb[IFLA_MAP]) {
836 struct rtnl_link_ifmap *u_map;
837 struct ifmap k_map;
838
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800839 if (!ops->ndo_set_config) {
Patrick McHardy0157f602007-06-13 12:03:36 -0700840 err = -EOPNOTSUPP;
841 goto errout;
842 }
843
844 if (!netif_device_present(dev)) {
845 err = -ENODEV;
846 goto errout;
847 }
848
849 u_map = nla_data(tb[IFLA_MAP]);
850 k_map.mem_start = (unsigned long) u_map->mem_start;
851 k_map.mem_end = (unsigned long) u_map->mem_end;
852 k_map.base_addr = (unsigned short) u_map->base_addr;
853 k_map.irq = (unsigned char) u_map->irq;
854 k_map.dma = (unsigned char) u_map->dma;
855 k_map.port = (unsigned char) u_map->port;
856
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800857 err = ops->ndo_set_config(dev, &k_map);
Patrick McHardy0157f602007-06-13 12:03:36 -0700858 if (err < 0)
859 goto errout;
860
861 modified = 1;
862 }
863
864 if (tb[IFLA_ADDRESS]) {
865 struct sockaddr *sa;
866 int len;
867
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800868 if (!ops->ndo_set_mac_address) {
Patrick McHardy0157f602007-06-13 12:03:36 -0700869 err = -EOPNOTSUPP;
870 goto errout;
871 }
872
873 if (!netif_device_present(dev)) {
874 err = -ENODEV;
875 goto errout;
876 }
877
878 len = sizeof(sa_family_t) + dev->addr_len;
879 sa = kmalloc(len, GFP_KERNEL);
880 if (!sa) {
881 err = -ENOMEM;
882 goto errout;
883 }
884 sa->sa_family = dev->type;
885 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
886 dev->addr_len);
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800887 err = ops->ndo_set_mac_address(dev, sa);
Patrick McHardy0157f602007-06-13 12:03:36 -0700888 kfree(sa);
889 if (err)
890 goto errout;
891 send_addr_notify = 1;
892 modified = 1;
893 }
894
895 if (tb[IFLA_MTU]) {
896 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
897 if (err < 0)
898 goto errout;
899 modified = 1;
900 }
901
902 /*
903 * Interface selected by interface index but interface
904 * name provided implies that a name change has been
905 * requested.
906 */
907 if (ifm->ifi_index > 0 && ifname[0]) {
908 err = dev_change_name(dev, ifname);
909 if (err < 0)
910 goto errout;
911 modified = 1;
912 }
913
Stephen Hemminger0b815a12008-09-22 21:28:11 -0700914 if (tb[IFLA_IFALIAS]) {
915 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
916 nla_len(tb[IFLA_IFALIAS]));
917 if (err < 0)
918 goto errout;
919 modified = 1;
920 }
921
Patrick McHardy0157f602007-06-13 12:03:36 -0700922 if (tb[IFLA_BROADCAST]) {
923 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
924 send_addr_notify = 1;
925 }
926
927 if (ifm->ifi_flags || ifm->ifi_change) {
Patrick McHardy3729d502010-02-26 06:34:54 +0000928 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
Johannes Berg5f9021c2008-11-16 23:20:31 -0800929 if (err < 0)
930 goto errout;
Patrick McHardy0157f602007-06-13 12:03:36 -0700931 }
932
David S. Miller93b2d4a2008-02-17 18:35:07 -0800933 if (tb[IFLA_TXQLEN])
934 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
Patrick McHardy0157f602007-06-13 12:03:36 -0700935
Patrick McHardy0157f602007-06-13 12:03:36 -0700936 if (tb[IFLA_OPERSTATE])
David S. Miller93b2d4a2008-02-17 18:35:07 -0800937 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
Patrick McHardy0157f602007-06-13 12:03:36 -0700938
939 if (tb[IFLA_LINKMODE]) {
David S. Miller93b2d4a2008-02-17 18:35:07 -0800940 write_lock_bh(&dev_base_lock);
941 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
942 write_unlock_bh(&dev_base_lock);
Patrick McHardy0157f602007-06-13 12:03:36 -0700943 }
944
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000945 if (tb[IFLA_VF_MAC]) {
946 struct ifla_vf_mac *ivm;
947 ivm = nla_data(tb[IFLA_VF_MAC]);
Williams, Mitch A4edb2462010-02-24 21:59:56 +0000948 err = -EOPNOTSUPP;
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000949 if (ops->ndo_set_vf_mac)
950 err = ops->ndo_set_vf_mac(dev, ivm->vf, ivm->mac);
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000951 if (err < 0)
952 goto errout;
953 modified = 1;
954 }
955
956 if (tb[IFLA_VF_VLAN]) {
957 struct ifla_vf_vlan *ivv;
958 ivv = nla_data(tb[IFLA_VF_VLAN]);
Williams, Mitch A4edb2462010-02-24 21:59:56 +0000959 err = -EOPNOTSUPP;
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000960 if (ops->ndo_set_vf_vlan)
961 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
Williams, Mitch A4edb2462010-02-24 21:59:56 +0000962 ivv->vlan,
963 ivv->qos);
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000964 if (err < 0)
965 goto errout;
966 modified = 1;
967 }
968 err = 0;
969
970 if (tb[IFLA_VF_TX_RATE]) {
971 struct ifla_vf_tx_rate *ivt;
972 ivt = nla_data(tb[IFLA_VF_TX_RATE]);
Williams, Mitch A4edb2462010-02-24 21:59:56 +0000973 err = -EOPNOTSUPP;
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000974 if (ops->ndo_set_vf_tx_rate)
975 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, ivt->rate);
Williams, Mitch Aebc08a62010-02-10 01:44:05 +0000976 if (err < 0)
977 goto errout;
978 modified = 1;
979 }
Patrick McHardy0157f602007-06-13 12:03:36 -0700980 err = 0;
981
982errout:
983 if (err < 0 && modified && net_ratelimit())
984 printk(KERN_WARNING "A link change request failed with "
985 "some changes comitted already. Interface %s may "
986 "have been left with an inconsistent configuration, "
987 "please check.\n", dev->name);
988
989 if (send_addr_notify)
990 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
991 return err;
992}
993
Thomas Grafda5e0492006-08-10 21:17:37 -0700994static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900996 struct net *net = sock_net(skb->sk);
Thomas Grafda5e0492006-08-10 21:17:37 -0700997 struct ifinfomsg *ifm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 struct net_device *dev;
Patrick McHardy0157f602007-06-13 12:03:36 -0700999 int err;
Thomas Grafda5e0492006-08-10 21:17:37 -07001000 struct nlattr *tb[IFLA_MAX+1];
1001 char ifname[IFNAMSIZ];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
Thomas Grafda5e0492006-08-10 21:17:37 -07001003 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1004 if (err < 0)
1005 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
Thomas Graf5176f912006-08-26 20:13:18 -07001007 if (tb[IFLA_IFNAME])
1008 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
Patrick McHardy78e5b8912006-09-13 20:35:36 -07001009 else
1010 ifname[0] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 err = -EINVAL;
Thomas Grafda5e0492006-08-10 21:17:37 -07001013 ifm = nlmsg_data(nlh);
Patrick McHardy51055be2007-06-05 12:40:01 -07001014 if (ifm->ifi_index > 0)
Eric Dumazeta3d12892009-10-21 10:59:31 +00001015 dev = __dev_get_by_index(net, ifm->ifi_index);
Thomas Grafda5e0492006-08-10 21:17:37 -07001016 else if (tb[IFLA_IFNAME])
Eric Dumazeta3d12892009-10-21 10:59:31 +00001017 dev = __dev_get_by_name(net, ifname);
Thomas Grafda5e0492006-08-10 21:17:37 -07001018 else
1019 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
Thomas Grafda5e0492006-08-10 21:17:37 -07001021 if (dev == NULL) {
1022 err = -ENODEV;
1023 goto errout;
1024 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025
Eric Dumazete0d087a2009-11-07 01:26:17 -08001026 err = validate_linkmsg(dev, tb);
1027 if (err < 0)
Eric Dumazeta3d12892009-10-21 10:59:31 +00001028 goto errout;
Thomas Grafda5e0492006-08-10 21:17:37 -07001029
Patrick McHardy38f7b872007-06-13 12:03:51 -07001030 err = do_setlink(dev, ifm, tb, ifname, 0);
Thomas Grafda5e0492006-08-10 21:17:37 -07001031errout:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 return err;
1033}
1034
Patrick McHardy38f7b872007-06-13 12:03:51 -07001035static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1036{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001037 struct net *net = sock_net(skb->sk);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001038 const struct rtnl_link_ops *ops;
1039 struct net_device *dev;
1040 struct ifinfomsg *ifm;
1041 char ifname[IFNAMSIZ];
1042 struct nlattr *tb[IFLA_MAX+1];
1043 int err;
1044
1045 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
1052 ifm = nlmsg_data(nlh);
1053 if (ifm->ifi_index > 0)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001054 dev = __dev_get_by_index(net, ifm->ifi_index);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001055 else if (tb[IFLA_IFNAME])
Eric W. Biederman881d9662007-09-17 11:56:21 -07001056 dev = __dev_get_by_name(net, ifname);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001057 else
1058 return -EINVAL;
1059
1060 if (!dev)
1061 return -ENODEV;
1062
1063 ops = dev->rtnl_link_ops;
1064 if (!ops)
1065 return -EOPNOTSUPP;
1066
Eric Dumazet23289a32009-10-27 07:06:36 +00001067 ops->dellink(dev, NULL);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001068 return 0;
1069}
1070
Patrick McHardy3729d502010-02-26 06:34:54 +00001071int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1072{
1073 unsigned int old_flags;
1074 int err;
1075
1076 old_flags = dev->flags;
1077 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1078 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1079 if (err < 0)
1080 return err;
1081 }
1082
1083 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1084 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1085
1086 __dev_notify_flags(dev, old_flags);
1087 return 0;
1088}
1089EXPORT_SYMBOL(rtnl_configure_link);
1090
Eric W. Biederman81adee42009-11-08 00:53:51 -08001091struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1092 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
Pavel Emelianove7199282007-08-08 22:16:38 -07001093{
1094 int err;
1095 struct net_device *dev;
Eric Dumazet2e59af32009-09-02 18:03:00 -07001096 unsigned int num_queues = 1;
1097 unsigned int real_num_queues = 1;
Pavel Emelianove7199282007-08-08 22:16:38 -07001098
Eric Dumazet2e59af32009-09-02 18:03:00 -07001099 if (ops->get_tx_queues) {
Eric W. Biederman81adee42009-11-08 00:53:51 -08001100 err = ops->get_tx_queues(src_net, tb, &num_queues,
Eric Dumazete0d087a2009-11-07 01:26:17 -08001101 &real_num_queues);
Eric Dumazet2e59af32009-09-02 18:03:00 -07001102 if (err)
1103 goto err;
1104 }
Pavel Emelianove7199282007-08-08 22:16:38 -07001105 err = -ENOMEM;
Eric Dumazet2e59af32009-09-02 18:03:00 -07001106 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
Pavel Emelianove7199282007-08-08 22:16:38 -07001107 if (!dev)
1108 goto err;
1109
Eric W. Biederman81adee42009-11-08 00:53:51 -08001110 dev_net_set(dev, net);
1111 dev->rtnl_link_ops = ops;
Patrick McHardy3729d502010-02-26 06:34:54 +00001112 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
Eric Dumazet2e59af32009-09-02 18:03:00 -07001113 dev->real_num_tx_queues = real_num_queues;
Eric W. Biederman81adee42009-11-08 00:53:51 -08001114
Pavel Emelianove7199282007-08-08 22:16:38 -07001115 if (strchr(dev->name, '%')) {
1116 err = dev_alloc_name(dev, dev->name);
1117 if (err < 0)
1118 goto err_free;
1119 }
1120
Pavel Emelianove7199282007-08-08 22:16:38 -07001121 if (tb[IFLA_MTU])
1122 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1123 if (tb[IFLA_ADDRESS])
1124 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1125 nla_len(tb[IFLA_ADDRESS]));
1126 if (tb[IFLA_BROADCAST])
1127 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1128 nla_len(tb[IFLA_BROADCAST]));
1129 if (tb[IFLA_TXQLEN])
1130 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1131 if (tb[IFLA_OPERSTATE])
David S. Miller93b2d4a2008-02-17 18:35:07 -08001132 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
Pavel Emelianove7199282007-08-08 22:16:38 -07001133 if (tb[IFLA_LINKMODE])
1134 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1135
1136 return dev;
1137
1138err_free:
1139 free_netdev(dev);
1140err:
1141 return ERR_PTR(err);
1142}
Eric Dumazete0d087a2009-11-07 01:26:17 -08001143EXPORT_SYMBOL(rtnl_create_link);
Pavel Emelianove7199282007-08-08 22:16:38 -07001144
Patrick McHardy38f7b872007-06-13 12:03:51 -07001145static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1146{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001147 struct net *net = sock_net(skb->sk);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001148 const struct rtnl_link_ops *ops;
1149 struct net_device *dev;
1150 struct ifinfomsg *ifm;
1151 char kind[MODULE_NAME_LEN];
1152 char ifname[IFNAMSIZ];
1153 struct nlattr *tb[IFLA_MAX+1];
1154 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1155 int err;
1156
Johannes Berg95a5afc2008-10-16 15:24:51 -07001157#ifdef CONFIG_MODULES
Patrick McHardy38f7b872007-06-13 12:03:51 -07001158replay:
Thomas Graf8072f082007-07-31 14:13:50 -07001159#endif
Patrick McHardy38f7b872007-06-13 12:03:51 -07001160 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1161 if (err < 0)
1162 return err;
1163
1164 if (tb[IFLA_IFNAME])
1165 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1166 else
1167 ifname[0] = '\0';
1168
1169 ifm = nlmsg_data(nlh);
1170 if (ifm->ifi_index > 0)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001171 dev = __dev_get_by_index(net, ifm->ifi_index);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001172 else if (ifname[0])
Eric W. Biederman881d9662007-09-17 11:56:21 -07001173 dev = __dev_get_by_name(net, ifname);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001174 else
1175 dev = NULL;
1176
Eric Dumazete0d087a2009-11-07 01:26:17 -08001177 err = validate_linkmsg(dev, tb);
1178 if (err < 0)
Thomas Graf1840bb12008-02-23 19:54:36 -08001179 return err;
1180
Patrick McHardy38f7b872007-06-13 12:03:51 -07001181 if (tb[IFLA_LINKINFO]) {
1182 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1183 tb[IFLA_LINKINFO], ifla_info_policy);
1184 if (err < 0)
1185 return err;
1186 } else
1187 memset(linkinfo, 0, sizeof(linkinfo));
1188
1189 if (linkinfo[IFLA_INFO_KIND]) {
1190 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1191 ops = rtnl_link_ops_get(kind);
1192 } else {
1193 kind[0] = '\0';
1194 ops = NULL;
1195 }
1196
1197 if (1) {
1198 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
Eric W. Biederman81adee42009-11-08 00:53:51 -08001199 struct net *dest_net;
Patrick McHardy38f7b872007-06-13 12:03:51 -07001200
1201 if (ops) {
1202 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1203 err = nla_parse_nested(attr, ops->maxtype,
1204 linkinfo[IFLA_INFO_DATA],
1205 ops->policy);
1206 if (err < 0)
1207 return err;
1208 data = attr;
1209 }
1210 if (ops->validate) {
1211 err = ops->validate(tb, data);
1212 if (err < 0)
1213 return err;
1214 }
1215 }
1216
1217 if (dev) {
1218 int modified = 0;
1219
1220 if (nlh->nlmsg_flags & NLM_F_EXCL)
1221 return -EEXIST;
1222 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1223 return -EOPNOTSUPP;
1224
1225 if (linkinfo[IFLA_INFO_DATA]) {
1226 if (!ops || ops != dev->rtnl_link_ops ||
1227 !ops->changelink)
1228 return -EOPNOTSUPP;
1229
1230 err = ops->changelink(dev, tb, data);
1231 if (err < 0)
1232 return err;
1233 modified = 1;
1234 }
1235
1236 return do_setlink(dev, ifm, tb, ifname, modified);
1237 }
1238
1239 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1240 return -ENODEV;
1241
Patrick McHardy3729d502010-02-26 06:34:54 +00001242 if (ifm->ifi_index)
Patrick McHardy38f7b872007-06-13 12:03:51 -07001243 return -EOPNOTSUPP;
Patrick McHardy0e068772007-07-11 19:42:31 -07001244 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
Patrick McHardy38f7b872007-06-13 12:03:51 -07001245 return -EOPNOTSUPP;
1246
1247 if (!ops) {
Johannes Berg95a5afc2008-10-16 15:24:51 -07001248#ifdef CONFIG_MODULES
Patrick McHardy38f7b872007-06-13 12:03:51 -07001249 if (kind[0]) {
1250 __rtnl_unlock();
1251 request_module("rtnl-link-%s", kind);
1252 rtnl_lock();
1253 ops = rtnl_link_ops_get(kind);
1254 if (ops)
1255 goto replay;
1256 }
1257#endif
1258 return -EOPNOTSUPP;
1259 }
1260
1261 if (!ifname[0])
1262 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001263
Eric W. Biederman81adee42009-11-08 00:53:51 -08001264 dest_net = rtnl_link_get_net(net, tb);
1265 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001266
Pavel Emelianove7199282007-08-08 22:16:38 -07001267 if (IS_ERR(dev))
1268 err = PTR_ERR(dev);
1269 else if (ops->newlink)
Eric W. Biederman81adee42009-11-08 00:53:51 -08001270 err = ops->newlink(net, dev, tb, data);
Patrick McHardy2d85cba2007-07-11 19:42:13 -07001271 else
1272 err = register_netdevice(dev);
Dan Carpenter80032cf2010-04-21 23:53:27 +00001273
1274 if (err < 0 && !IS_ERR(dev))
Patrick McHardy38f7b872007-06-13 12:03:51 -07001275 free_netdev(dev);
Dan Carpenter80032cf2010-04-21 23:53:27 +00001276 if (err < 0)
Patrick McHardy3729d502010-02-26 06:34:54 +00001277 goto out;
Eric W. Biederman81adee42009-11-08 00:53:51 -08001278
Patrick McHardy3729d502010-02-26 06:34:54 +00001279 err = rtnl_configure_link(dev, ifm);
1280 if (err < 0)
1281 unregister_netdevice(dev);
1282out:
Eric W. Biederman81adee42009-11-08 00:53:51 -08001283 put_net(dest_net);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001284 return err;
1285 }
1286}
1287
Thomas Grafb60c5112006-08-04 23:05:34 -07001288static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001289{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001290 struct net *net = sock_net(skb->sk);
Thomas Grafb60c5112006-08-04 23:05:34 -07001291 struct ifinfomsg *ifm;
Eric Dumazeta3d12892009-10-21 10:59:31 +00001292 char ifname[IFNAMSIZ];
Thomas Grafb60c5112006-08-04 23:05:34 -07001293 struct nlattr *tb[IFLA_MAX+1];
1294 struct net_device *dev = NULL;
1295 struct sk_buff *nskb;
Thomas Graf339bf982006-11-10 14:10:15 -08001296 int err;
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001297
Thomas Grafb60c5112006-08-04 23:05:34 -07001298 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1299 if (err < 0)
Eric Sesterhenn9918f232006-09-26 23:26:38 -07001300 return err;
Thomas Grafb60c5112006-08-04 23:05:34 -07001301
Eric Dumazeta3d12892009-10-21 10:59:31 +00001302 if (tb[IFLA_IFNAME])
1303 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1304
Thomas Grafb60c5112006-08-04 23:05:34 -07001305 ifm = nlmsg_data(nlh);
Eric Dumazeta3d12892009-10-21 10:59:31 +00001306 if (ifm->ifi_index > 0)
1307 dev = __dev_get_by_index(net, ifm->ifi_index);
1308 else if (tb[IFLA_IFNAME])
1309 dev = __dev_get_by_name(net, ifname);
1310 else
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001311 return -EINVAL;
Thomas Grafb60c5112006-08-04 23:05:34 -07001312
Eric Dumazeta3d12892009-10-21 10:59:31 +00001313 if (dev == NULL)
1314 return -ENODEV;
1315
Patrick McHardy38f7b872007-06-13 12:03:51 -07001316 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
Eric Dumazeta3d12892009-10-21 10:59:31 +00001317 if (nskb == NULL)
1318 return -ENOBUFS;
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001319
Patrick McHardy575c3e22007-05-22 17:00:49 -07001320 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1321 nlh->nlmsg_seq, 0, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08001322 if (err < 0) {
1323 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1324 WARN_ON(err == -EMSGSIZE);
1325 kfree_skb(nskb);
Eric Dumazeta3d12892009-10-21 10:59:31 +00001326 } else
1327 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
Thomas Grafb60c5112006-08-04 23:05:34 -07001328
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001329 return err;
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001330}
Jean Tourrilhes711e2c32006-02-22 15:10:56 -08001331
Adrian Bunk42bad1d2007-04-26 00:57:41 -07001332static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333{
1334 int idx;
1335 int s_idx = cb->family;
1336
1337 if (s_idx == 0)
1338 s_idx = 1;
Eric Dumazete0d087a2009-11-07 01:26:17 -08001339 for (idx = 1; idx < NPROTO; idx++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 int type = cb->nlh->nlmsg_type-RTM_BASE;
1341 if (idx < s_idx || idx == PF_PACKET)
1342 continue;
Thomas Grafe2849862007-03-22 11:48:11 -07001343 if (rtnl_msg_handlers[idx] == NULL ||
1344 rtnl_msg_handlers[idx][type].dumpit == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 continue;
1346 if (idx > s_idx)
1347 memset(&cb->args[0], 0, sizeof(cb->args));
Thomas Grafe2849862007-03-22 11:48:11 -07001348 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 break;
1350 }
1351 cb->family = idx;
1352
1353 return skb->len;
1354}
1355
1356void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1357{
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001358 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 struct sk_buff *skb;
Thomas Graf0ec6d3f2006-08-15 00:37:09 -07001360 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361
Patrick McHardy38f7b872007-06-13 12:03:51 -07001362 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
Thomas Graf0ec6d3f2006-08-15 00:37:09 -07001363 if (skb == NULL)
1364 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365
Patrick McHardy575c3e22007-05-22 17:00:49 -07001366 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08001367 if (err < 0) {
1368 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1369 WARN_ON(err == -EMSGSIZE);
1370 kfree_skb(skb);
1371 goto errout;
1372 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -08001373 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1374 return;
Thomas Graf0ec6d3f2006-08-15 00:37:09 -07001375errout:
1376 if (err < 0)
Eric W. Biederman4b3da702007-11-19 22:27:40 -08001377 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378}
1379
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380/* Protected by RTNL sempahore. */
1381static struct rtattr **rta_buf;
1382static int rtattr_max;
1383
1384/* Process one rtnetlink message. */
1385
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001386static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001388 struct net *net = sock_net(skb->sk);
Thomas Grafe2849862007-03-22 11:48:11 -07001389 rtnl_doit_func doit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 int sz_idx, kind;
1391 int min_len;
1392 int family;
1393 int type;
Patrick McHardy1c2d6702007-04-16 16:59:10 -07001394 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 type = nlh->nlmsg_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 if (type > RTM_MAX)
Thomas Graf038890f2007-04-05 14:35:52 -07001398 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
1400 type -= RTM_BASE;
1401
1402 /* All the messages must have at least 1 byte length */
1403 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1404 return 0;
1405
Eric Dumazete0d087a2009-11-07 01:26:17 -08001406 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001407 if (family >= NPROTO)
1408 return -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 sz_idx = type>>2;
1411 kind = type&3;
1412
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001413 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1414 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415
1416 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001417 struct sock *rtnl;
Thomas Grafe2849862007-03-22 11:48:11 -07001418 rtnl_dumpit_func dumpit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419
Thomas Grafe2849862007-03-22 11:48:11 -07001420 dumpit = rtnl_get_dumpit(family, type);
1421 if (dumpit == NULL)
Thomas Graf038890f2007-04-05 14:35:52 -07001422 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423
Patrick McHardy1c2d6702007-04-16 16:59:10 -07001424 __rtnl_unlock();
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001425 rtnl = net->rtnl;
Patrick McHardy1c2d6702007-04-16 16:59:10 -07001426 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1427 rtnl_lock();
1428 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 }
1430
1431 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1432
1433 min_len = rtm_min[sz_idx];
1434 if (nlh->nlmsg_len < min_len)
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001435 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
1437 if (nlh->nlmsg_len > min_len) {
1438 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
Eric Dumazete0d087a2009-11-07 01:26:17 -08001439 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440
1441 while (RTA_OK(attr, attrlen)) {
1442 unsigned flavor = attr->rta_type;
1443 if (flavor) {
1444 if (flavor > rta_max[sz_idx])
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001445 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 rta_buf[flavor-1] = attr;
1447 }
1448 attr = RTA_NEXT(attr, attrlen);
1449 }
1450 }
1451
Thomas Grafe2849862007-03-22 11:48:11 -07001452 doit = rtnl_get_doit(family, type);
1453 if (doit == NULL)
Thomas Graf038890f2007-04-05 14:35:52 -07001454 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
Thomas Graf1d00a4e2007-03-22 23:30:12 -07001456 return doit(skb, nlh, (void *)&rta_buf[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457}
1458
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001459static void rtnetlink_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460{
Denis V. Lunevcd40b7d2007-10-10 21:15:29 -07001461 rtnl_lock();
1462 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1463 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464}
1465
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1467{
1468 struct net_device *dev = ptr;
Eric W. Biedermane9dc8652007-09-12 13:02:17 +02001469
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 switch (event) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 case NETDEV_UP:
1472 case NETDEV_DOWN:
Patrick McHardy10de05a2010-02-26 06:34:50 +00001473 case NETDEV_PRE_UP:
Eric W. Biedermand90a9092009-12-12 22:11:15 +00001474 case NETDEV_POST_INIT:
1475 case NETDEV_REGISTER:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 case NETDEV_CHANGE:
1477 case NETDEV_GOING_DOWN:
Patrick McHardya2835762010-02-26 06:34:51 +00001478 case NETDEV_UNREGISTER:
Eric W. Biedermand90a9092009-12-12 22:11:15 +00001479 case NETDEV_UNREGISTER_BATCH:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 break;
1481 default:
1482 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1483 break;
1484 }
1485 return NOTIFY_DONE;
1486}
1487
1488static struct notifier_block rtnetlink_dev_notifier = {
1489 .notifier_call = rtnetlink_event,
1490};
1491
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001492
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001493static int __net_init rtnetlink_net_init(struct net *net)
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001494{
1495 struct sock *sk;
1496 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1497 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1498 if (!sk)
1499 return -ENOMEM;
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001500 net->rtnl = sk;
1501 return 0;
1502}
1503
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001504static void __net_exit rtnetlink_net_exit(struct net *net)
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001505{
Denis V. Lunev775516b2008-01-18 23:55:19 -08001506 netlink_kernel_release(net->rtnl);
1507 net->rtnl = NULL;
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001508}
1509
1510static struct pernet_operations rtnetlink_net_ops = {
1511 .init = rtnetlink_net_init,
1512 .exit = rtnetlink_net_exit,
1513};
1514
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515void __init rtnetlink_init(void)
1516{
1517 int i;
1518
1519 rtattr_max = 0;
1520 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1521 if (rta_max[i] > rtattr_max)
1522 rtattr_max = rta_max[i];
1523 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1524 if (!rta_buf)
1525 panic("rtnetlink_init: cannot allocate rta_buf\n");
1526
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001527 if (register_pernet_subsys(&rtnetlink_net_ops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 panic("rtnetlink_init: cannot initialize rtnetlink\n");
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001529
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1531 register_netdevice_notifier(&rtnetlink_dev_notifier);
Thomas Graf340d17f2007-03-22 11:49:22 -07001532
1533 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1534 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
Patrick McHardy38f7b872007-06-13 12:03:51 -07001535 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1536 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
Thomas Graf687ad8c2007-03-22 11:59:42 -07001537
1538 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1539 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540}
1541