xref: /openbmc/linux/net/core/rtnetlink.c (revision 10708f37ae729baba9b67bd134c3720709d4ae62)
11da177e4SLinus Torvalds /*
21da177e4SLinus Torvalds  * INET		An implementation of the TCP/IP protocol suite for the LINUX
31da177e4SLinus Torvalds  *		operating system.  INET is implemented using the  BSD Socket
41da177e4SLinus Torvalds  *		interface as the means of communication with the user level.
51da177e4SLinus Torvalds  *
61da177e4SLinus Torvalds  *		Routing netlink socket interface: protocol independent part.
71da177e4SLinus Torvalds  *
81da177e4SLinus Torvalds  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
91da177e4SLinus Torvalds  *
101da177e4SLinus Torvalds  *		This program is free software; you can redistribute it and/or
111da177e4SLinus Torvalds  *		modify it under the terms of the GNU General Public License
121da177e4SLinus Torvalds  *		as published by the Free Software Foundation; either version
131da177e4SLinus Torvalds  *		2 of the License, or (at your option) any later version.
141da177e4SLinus Torvalds  *
151da177e4SLinus Torvalds  *	Fixes:
161da177e4SLinus Torvalds  *	Vitaly E. Lavrov		RTA_OK arithmetics was wrong.
171da177e4SLinus Torvalds  */
181da177e4SLinus Torvalds 
191da177e4SLinus Torvalds #include <linux/errno.h>
201da177e4SLinus Torvalds #include <linux/module.h>
211da177e4SLinus Torvalds #include <linux/types.h>
221da177e4SLinus Torvalds #include <linux/socket.h>
231da177e4SLinus Torvalds #include <linux/kernel.h>
241da177e4SLinus Torvalds #include <linux/timer.h>
251da177e4SLinus Torvalds #include <linux/string.h>
261da177e4SLinus Torvalds #include <linux/sockios.h>
271da177e4SLinus Torvalds #include <linux/net.h>
281da177e4SLinus Torvalds #include <linux/fcntl.h>
291da177e4SLinus Torvalds #include <linux/mm.h>
301da177e4SLinus Torvalds #include <linux/slab.h>
311da177e4SLinus Torvalds #include <linux/interrupt.h>
321da177e4SLinus Torvalds #include <linux/capability.h>
331da177e4SLinus Torvalds #include <linux/skbuff.h>
341da177e4SLinus Torvalds #include <linux/init.h>
351da177e4SLinus Torvalds #include <linux/security.h>
366756ae4bSStephen Hemminger #include <linux/mutex.h>
371823730fSThomas Graf #include <linux/if_addr.h>
38ebc08a6fSWilliams, Mitch A #include <linux/pci.h>
391da177e4SLinus Torvalds 
401da177e4SLinus Torvalds #include <asm/uaccess.h>
411da177e4SLinus Torvalds #include <asm/system.h>
421da177e4SLinus Torvalds 
431da177e4SLinus Torvalds #include <linux/inet.h>
441da177e4SLinus Torvalds #include <linux/netdevice.h>
451da177e4SLinus Torvalds #include <net/ip.h>
461da177e4SLinus Torvalds #include <net/protocol.h>
471da177e4SLinus Torvalds #include <net/arp.h>
481da177e4SLinus Torvalds #include <net/route.h>
491da177e4SLinus Torvalds #include <net/udp.h>
501da177e4SLinus Torvalds #include <net/sock.h>
511da177e4SLinus Torvalds #include <net/pkt_sched.h>
5214c0b97dSThomas Graf #include <net/fib_rules.h>
53e2849863SThomas Graf #include <net/rtnetlink.h>
5430ffee84SJohannes Berg #include <net/net_namespace.h>
551da177e4SLinus Torvalds 
56e0d087afSEric Dumazet struct rtnl_link {
57e2849863SThomas Graf 	rtnl_doit_func		doit;
58e2849863SThomas Graf 	rtnl_dumpit_func	dumpit;
59e2849863SThomas Graf };
60e2849863SThomas Graf 
616756ae4bSStephen Hemminger static DEFINE_MUTEX(rtnl_mutex);
621da177e4SLinus Torvalds 
631da177e4SLinus Torvalds void rtnl_lock(void)
641da177e4SLinus Torvalds {
656756ae4bSStephen Hemminger 	mutex_lock(&rtnl_mutex);
661da177e4SLinus Torvalds }
67e0d087afSEric Dumazet EXPORT_SYMBOL(rtnl_lock);
681da177e4SLinus Torvalds 
696756ae4bSStephen Hemminger void __rtnl_unlock(void)
701da177e4SLinus Torvalds {
716756ae4bSStephen Hemminger 	mutex_unlock(&rtnl_mutex);
721da177e4SLinus Torvalds }
731da177e4SLinus Torvalds 
741da177e4SLinus Torvalds void rtnl_unlock(void)
751da177e4SLinus Torvalds {
7658ec3b4dSHerbert Xu 	/* This fellow will unlock it for us. */
771da177e4SLinus Torvalds 	netdev_run_todo();
781da177e4SLinus Torvalds }
79e0d087afSEric Dumazet EXPORT_SYMBOL(rtnl_unlock);
801da177e4SLinus Torvalds 
816756ae4bSStephen Hemminger int rtnl_trylock(void)
826756ae4bSStephen Hemminger {
836756ae4bSStephen Hemminger 	return mutex_trylock(&rtnl_mutex);
846756ae4bSStephen Hemminger }
85e0d087afSEric Dumazet EXPORT_SYMBOL(rtnl_trylock);
866756ae4bSStephen Hemminger 
87c9c1014bSPatrick McHardy int rtnl_is_locked(void)
88c9c1014bSPatrick McHardy {
89c9c1014bSPatrick McHardy 	return mutex_is_locked(&rtnl_mutex);
90c9c1014bSPatrick McHardy }
91e0d087afSEric Dumazet EXPORT_SYMBOL(rtnl_is_locked);
92c9c1014bSPatrick McHardy 
93a898def2SPaul E. McKenney #ifdef CONFIG_PROVE_LOCKING
94a898def2SPaul E. McKenney int lockdep_rtnl_is_held(void)
95a898def2SPaul E. McKenney {
96a898def2SPaul E. McKenney 	return lockdep_is_held(&rtnl_mutex);
97a898def2SPaul E. McKenney }
98a898def2SPaul E. McKenney EXPORT_SYMBOL(lockdep_rtnl_is_held);
99a898def2SPaul E. McKenney #endif /* #ifdef CONFIG_PROVE_LOCKING */
100a898def2SPaul E. McKenney 
10142bad1daSAdrian Bunk static struct rtnl_link *rtnl_msg_handlers[NPROTO];
102e2849863SThomas Graf 
103e2849863SThomas Graf static inline int rtm_msgindex(int msgtype)
104e2849863SThomas Graf {
105e2849863SThomas Graf 	int msgindex = msgtype - RTM_BASE;
106e2849863SThomas Graf 
107e2849863SThomas Graf 	/*
108e2849863SThomas Graf 	 * msgindex < 0 implies someone tried to register a netlink
109e2849863SThomas Graf 	 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
110e2849863SThomas Graf 	 * the message type has not been added to linux/rtnetlink.h
111e2849863SThomas Graf 	 */
112e2849863SThomas Graf 	BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
113e2849863SThomas Graf 
114e2849863SThomas Graf 	return msgindex;
115e2849863SThomas Graf }
116e2849863SThomas Graf 
117e2849863SThomas Graf static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
118e2849863SThomas Graf {
119e2849863SThomas Graf 	struct rtnl_link *tab;
120e2849863SThomas Graf 
121e2849863SThomas Graf 	tab = rtnl_msg_handlers[protocol];
12251057f2fSThomas Graf 	if (tab == NULL || tab[msgindex].doit == NULL)
123e2849863SThomas Graf 		tab = rtnl_msg_handlers[PF_UNSPEC];
124e2849863SThomas Graf 
12551057f2fSThomas Graf 	return tab ? tab[msgindex].doit : NULL;
126e2849863SThomas Graf }
127e2849863SThomas Graf 
128e2849863SThomas Graf static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
129e2849863SThomas Graf {
130e2849863SThomas Graf 	struct rtnl_link *tab;
131e2849863SThomas Graf 
132e2849863SThomas Graf 	tab = rtnl_msg_handlers[protocol];
13351057f2fSThomas Graf 	if (tab == NULL || tab[msgindex].dumpit == NULL)
134e2849863SThomas Graf 		tab = rtnl_msg_handlers[PF_UNSPEC];
135e2849863SThomas Graf 
13651057f2fSThomas Graf 	return tab ? tab[msgindex].dumpit : NULL;
137e2849863SThomas Graf }
138e2849863SThomas Graf 
139e2849863SThomas Graf /**
140e2849863SThomas Graf  * __rtnl_register - Register a rtnetlink message type
141e2849863SThomas Graf  * @protocol: Protocol family or PF_UNSPEC
142e2849863SThomas Graf  * @msgtype: rtnetlink message type
143e2849863SThomas Graf  * @doit: Function pointer called for each request message
144e2849863SThomas Graf  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
145e2849863SThomas Graf  *
146e2849863SThomas Graf  * Registers the specified function pointers (at least one of them has
147e2849863SThomas Graf  * to be non-NULL) to be called whenever a request message for the
148e2849863SThomas Graf  * specified protocol family and message type is received.
149e2849863SThomas Graf  *
150e2849863SThomas Graf  * The special protocol family PF_UNSPEC may be used to define fallback
151e2849863SThomas Graf  * function pointers for the case when no entry for the specific protocol
152e2849863SThomas Graf  * family exists.
153e2849863SThomas Graf  *
154e2849863SThomas Graf  * Returns 0 on success or a negative error code.
155e2849863SThomas Graf  */
156e2849863SThomas Graf int __rtnl_register(int protocol, int msgtype,
157e2849863SThomas Graf 		    rtnl_doit_func doit, rtnl_dumpit_func dumpit)
158e2849863SThomas Graf {
159e2849863SThomas Graf 	struct rtnl_link *tab;
160e2849863SThomas Graf 	int msgindex;
161e2849863SThomas Graf 
162e2849863SThomas Graf 	BUG_ON(protocol < 0 || protocol >= NPROTO);
163e2849863SThomas Graf 	msgindex = rtm_msgindex(msgtype);
164e2849863SThomas Graf 
165e2849863SThomas Graf 	tab = rtnl_msg_handlers[protocol];
166e2849863SThomas Graf 	if (tab == NULL) {
167e2849863SThomas Graf 		tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
168e2849863SThomas Graf 		if (tab == NULL)
169e2849863SThomas Graf 			return -ENOBUFS;
170e2849863SThomas Graf 
171e2849863SThomas Graf 		rtnl_msg_handlers[protocol] = tab;
172e2849863SThomas Graf 	}
173e2849863SThomas Graf 
174e2849863SThomas Graf 	if (doit)
175e2849863SThomas Graf 		tab[msgindex].doit = doit;
176e2849863SThomas Graf 
177e2849863SThomas Graf 	if (dumpit)
178e2849863SThomas Graf 		tab[msgindex].dumpit = dumpit;
179e2849863SThomas Graf 
180e2849863SThomas Graf 	return 0;
181e2849863SThomas Graf }
182e2849863SThomas Graf EXPORT_SYMBOL_GPL(__rtnl_register);
183e2849863SThomas Graf 
184e2849863SThomas Graf /**
185e2849863SThomas Graf  * rtnl_register - Register a rtnetlink message type
186e2849863SThomas Graf  *
187e2849863SThomas Graf  * Identical to __rtnl_register() but panics on failure. This is useful
188e2849863SThomas Graf  * as failure of this function is very unlikely, it can only happen due
189e2849863SThomas Graf  * to lack of memory when allocating the chain to store all message
190e2849863SThomas Graf  * handlers for a protocol. Meant for use in init functions where lack
191e2849863SThomas Graf  * of memory implies no sense in continueing.
192e2849863SThomas Graf  */
193e2849863SThomas Graf void rtnl_register(int protocol, int msgtype,
194e2849863SThomas Graf 		   rtnl_doit_func doit, rtnl_dumpit_func dumpit)
195e2849863SThomas Graf {
196e2849863SThomas Graf 	if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
197e2849863SThomas Graf 		panic("Unable to register rtnetlink message handler, "
198e2849863SThomas Graf 		      "protocol = %d, message type = %d\n",
199e2849863SThomas Graf 		      protocol, msgtype);
200e2849863SThomas Graf }
201e2849863SThomas Graf EXPORT_SYMBOL_GPL(rtnl_register);
202e2849863SThomas Graf 
203e2849863SThomas Graf /**
204e2849863SThomas Graf  * rtnl_unregister - Unregister a rtnetlink message type
205e2849863SThomas Graf  * @protocol: Protocol family or PF_UNSPEC
206e2849863SThomas Graf  * @msgtype: rtnetlink message type
207e2849863SThomas Graf  *
208e2849863SThomas Graf  * Returns 0 on success or a negative error code.
209e2849863SThomas Graf  */
210e2849863SThomas Graf int rtnl_unregister(int protocol, int msgtype)
211e2849863SThomas Graf {
212e2849863SThomas Graf 	int msgindex;
213e2849863SThomas Graf 
214e2849863SThomas Graf 	BUG_ON(protocol < 0 || protocol >= NPROTO);
215e2849863SThomas Graf 	msgindex = rtm_msgindex(msgtype);
216e2849863SThomas Graf 
217e2849863SThomas Graf 	if (rtnl_msg_handlers[protocol] == NULL)
218e2849863SThomas Graf 		return -ENOENT;
219e2849863SThomas Graf 
220e2849863SThomas Graf 	rtnl_msg_handlers[protocol][msgindex].doit = NULL;
221e2849863SThomas Graf 	rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
222e2849863SThomas Graf 
223e2849863SThomas Graf 	return 0;
224e2849863SThomas Graf }
225e2849863SThomas Graf EXPORT_SYMBOL_GPL(rtnl_unregister);
226e2849863SThomas Graf 
227e2849863SThomas Graf /**
228e2849863SThomas Graf  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
229e2849863SThomas Graf  * @protocol : Protocol family or PF_UNSPEC
230e2849863SThomas Graf  *
231e2849863SThomas Graf  * Identical to calling rtnl_unregster() for all registered message types
232e2849863SThomas Graf  * of a certain protocol family.
233e2849863SThomas Graf  */
234e2849863SThomas Graf void rtnl_unregister_all(int protocol)
235e2849863SThomas Graf {
236e2849863SThomas Graf 	BUG_ON(protocol < 0 || protocol >= NPROTO);
237e2849863SThomas Graf 
238e2849863SThomas Graf 	kfree(rtnl_msg_handlers[protocol]);
239e2849863SThomas Graf 	rtnl_msg_handlers[protocol] = NULL;
240e2849863SThomas Graf }
241e2849863SThomas Graf EXPORT_SYMBOL_GPL(rtnl_unregister_all);
2421da177e4SLinus Torvalds 
24338f7b870SPatrick McHardy static LIST_HEAD(link_ops);
24438f7b870SPatrick McHardy 
24538f7b870SPatrick McHardy /**
24638f7b870SPatrick McHardy  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
24738f7b870SPatrick McHardy  * @ops: struct rtnl_link_ops * to register
24838f7b870SPatrick McHardy  *
24938f7b870SPatrick McHardy  * The caller must hold the rtnl_mutex. This function should be used
25038f7b870SPatrick McHardy  * by drivers that create devices during module initialization. It
25138f7b870SPatrick McHardy  * must be called before registering the devices.
25238f7b870SPatrick McHardy  *
25338f7b870SPatrick McHardy  * Returns 0 on success or a negative error code.
25438f7b870SPatrick McHardy  */
25538f7b870SPatrick McHardy int __rtnl_link_register(struct rtnl_link_ops *ops)
25638f7b870SPatrick McHardy {
2572d85cba2SPatrick McHardy 	if (!ops->dellink)
25823289a37SEric Dumazet 		ops->dellink = unregister_netdevice_queue;
2592d85cba2SPatrick McHardy 
26038f7b870SPatrick McHardy 	list_add_tail(&ops->list, &link_ops);
26138f7b870SPatrick McHardy 	return 0;
26238f7b870SPatrick McHardy }
26338f7b870SPatrick McHardy EXPORT_SYMBOL_GPL(__rtnl_link_register);
26438f7b870SPatrick McHardy 
26538f7b870SPatrick McHardy /**
26638f7b870SPatrick McHardy  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
26738f7b870SPatrick McHardy  * @ops: struct rtnl_link_ops * to register
26838f7b870SPatrick McHardy  *
26938f7b870SPatrick McHardy  * Returns 0 on success or a negative error code.
27038f7b870SPatrick McHardy  */
27138f7b870SPatrick McHardy int rtnl_link_register(struct rtnl_link_ops *ops)
27238f7b870SPatrick McHardy {
27338f7b870SPatrick McHardy 	int err;
27438f7b870SPatrick McHardy 
27538f7b870SPatrick McHardy 	rtnl_lock();
27638f7b870SPatrick McHardy 	err = __rtnl_link_register(ops);
27738f7b870SPatrick McHardy 	rtnl_unlock();
27838f7b870SPatrick McHardy 	return err;
27938f7b870SPatrick McHardy }
28038f7b870SPatrick McHardy EXPORT_SYMBOL_GPL(rtnl_link_register);
28138f7b870SPatrick McHardy 
282669f87baSPavel Emelyanov static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
283669f87baSPavel Emelyanov {
284669f87baSPavel Emelyanov 	struct net_device *dev;
28523289a37SEric Dumazet 	LIST_HEAD(list_kill);
28623289a37SEric Dumazet 
287669f87baSPavel Emelyanov 	for_each_netdev(net, dev) {
28823289a37SEric Dumazet 		if (dev->rtnl_link_ops == ops)
28923289a37SEric Dumazet 			ops->dellink(dev, &list_kill);
290669f87baSPavel Emelyanov 	}
29123289a37SEric Dumazet 	unregister_netdevice_many(&list_kill);
292669f87baSPavel Emelyanov }
293669f87baSPavel Emelyanov 
294669f87baSPavel Emelyanov void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
295669f87baSPavel Emelyanov {
296669f87baSPavel Emelyanov 	rtnl_lock();
297669f87baSPavel Emelyanov 	__rtnl_kill_links(net, ops);
298669f87baSPavel Emelyanov 	rtnl_unlock();
299669f87baSPavel Emelyanov }
300669f87baSPavel Emelyanov EXPORT_SYMBOL_GPL(rtnl_kill_links);
301669f87baSPavel Emelyanov 
30238f7b870SPatrick McHardy /**
30338f7b870SPatrick McHardy  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
30438f7b870SPatrick McHardy  * @ops: struct rtnl_link_ops * to unregister
30538f7b870SPatrick McHardy  *
3062d85cba2SPatrick McHardy  * The caller must hold the rtnl_mutex.
30738f7b870SPatrick McHardy  */
30838f7b870SPatrick McHardy void __rtnl_link_unregister(struct rtnl_link_ops *ops)
30938f7b870SPatrick McHardy {
310881d966bSEric W. Biederman 	struct net *net;
3112d85cba2SPatrick McHardy 
312881d966bSEric W. Biederman 	for_each_net(net) {
313669f87baSPavel Emelyanov 		__rtnl_kill_links(net, ops);
314881d966bSEric W. Biederman 	}
31538f7b870SPatrick McHardy 	list_del(&ops->list);
31638f7b870SPatrick McHardy }
31738f7b870SPatrick McHardy EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
31838f7b870SPatrick McHardy 
31938f7b870SPatrick McHardy /**
32038f7b870SPatrick McHardy  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
32138f7b870SPatrick McHardy  * @ops: struct rtnl_link_ops * to unregister
32238f7b870SPatrick McHardy  */
32338f7b870SPatrick McHardy void rtnl_link_unregister(struct rtnl_link_ops *ops)
32438f7b870SPatrick McHardy {
32538f7b870SPatrick McHardy 	rtnl_lock();
32638f7b870SPatrick McHardy 	__rtnl_link_unregister(ops);
32738f7b870SPatrick McHardy 	rtnl_unlock();
32838f7b870SPatrick McHardy }
32938f7b870SPatrick McHardy EXPORT_SYMBOL_GPL(rtnl_link_unregister);
33038f7b870SPatrick McHardy 
33138f7b870SPatrick McHardy static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
33238f7b870SPatrick McHardy {
33338f7b870SPatrick McHardy 	const struct rtnl_link_ops *ops;
33438f7b870SPatrick McHardy 
33538f7b870SPatrick McHardy 	list_for_each_entry(ops, &link_ops, list) {
33638f7b870SPatrick McHardy 		if (!strcmp(ops->kind, kind))
33738f7b870SPatrick McHardy 			return ops;
33838f7b870SPatrick McHardy 	}
33938f7b870SPatrick McHardy 	return NULL;
34038f7b870SPatrick McHardy }
34138f7b870SPatrick McHardy 
34238f7b870SPatrick McHardy static size_t rtnl_link_get_size(const struct net_device *dev)
34338f7b870SPatrick McHardy {
34438f7b870SPatrick McHardy 	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
34538f7b870SPatrick McHardy 	size_t size;
34638f7b870SPatrick McHardy 
34738f7b870SPatrick McHardy 	if (!ops)
34838f7b870SPatrick McHardy 		return 0;
34938f7b870SPatrick McHardy 
35038f7b870SPatrick McHardy 	size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
35138f7b870SPatrick McHardy 	       nlmsg_total_size(strlen(ops->kind) + 1);	 /* IFLA_INFO_KIND */
35238f7b870SPatrick McHardy 
35338f7b870SPatrick McHardy 	if (ops->get_size)
35438f7b870SPatrick McHardy 		/* IFLA_INFO_DATA + nested data */
35538f7b870SPatrick McHardy 		size += nlmsg_total_size(sizeof(struct nlattr)) +
35638f7b870SPatrick McHardy 			ops->get_size(dev);
35738f7b870SPatrick McHardy 
35838f7b870SPatrick McHardy 	if (ops->get_xstats_size)
35938f7b870SPatrick McHardy 		size += ops->get_xstats_size(dev);	/* IFLA_INFO_XSTATS */
36038f7b870SPatrick McHardy 
36138f7b870SPatrick McHardy 	return size;
36238f7b870SPatrick McHardy }
36338f7b870SPatrick McHardy 
36438f7b870SPatrick McHardy static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
36538f7b870SPatrick McHardy {
36638f7b870SPatrick McHardy 	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
36738f7b870SPatrick McHardy 	struct nlattr *linkinfo, *data;
36838f7b870SPatrick McHardy 	int err = -EMSGSIZE;
36938f7b870SPatrick McHardy 
37038f7b870SPatrick McHardy 	linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
37138f7b870SPatrick McHardy 	if (linkinfo == NULL)
37238f7b870SPatrick McHardy 		goto out;
37338f7b870SPatrick McHardy 
37438f7b870SPatrick McHardy 	if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
37538f7b870SPatrick McHardy 		goto err_cancel_link;
37638f7b870SPatrick McHardy 	if (ops->fill_xstats) {
37738f7b870SPatrick McHardy 		err = ops->fill_xstats(skb, dev);
37838f7b870SPatrick McHardy 		if (err < 0)
37938f7b870SPatrick McHardy 			goto err_cancel_link;
38038f7b870SPatrick McHardy 	}
38138f7b870SPatrick McHardy 	if (ops->fill_info) {
38238f7b870SPatrick McHardy 		data = nla_nest_start(skb, IFLA_INFO_DATA);
38338f7b870SPatrick McHardy 		if (data == NULL)
38438f7b870SPatrick McHardy 			goto err_cancel_link;
38538f7b870SPatrick McHardy 		err = ops->fill_info(skb, dev);
38638f7b870SPatrick McHardy 		if (err < 0)
38738f7b870SPatrick McHardy 			goto err_cancel_data;
38838f7b870SPatrick McHardy 		nla_nest_end(skb, data);
38938f7b870SPatrick McHardy 	}
39038f7b870SPatrick McHardy 
39138f7b870SPatrick McHardy 	nla_nest_end(skb, linkinfo);
39238f7b870SPatrick McHardy 	return 0;
39338f7b870SPatrick McHardy 
39438f7b870SPatrick McHardy err_cancel_data:
39538f7b870SPatrick McHardy 	nla_nest_cancel(skb, data);
39638f7b870SPatrick McHardy err_cancel_link:
39738f7b870SPatrick McHardy 	nla_nest_cancel(skb, linkinfo);
39838f7b870SPatrick McHardy out:
39938f7b870SPatrick McHardy 	return err;
40038f7b870SPatrick McHardy }
40138f7b870SPatrick McHardy 
402db46edc6SThomas Graf static const int rtm_min[RTM_NR_FAMILIES] =
4031da177e4SLinus Torvalds {
404f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
405f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
406f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
40714c0b97dSThomas Graf 	[RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
408f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
409f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
410f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
411f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
412f90a0a74SThomas Graf 	[RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
413f90a0a74SThomas Graf 	[RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
4141da177e4SLinus Torvalds };
4151da177e4SLinus Torvalds 
416db46edc6SThomas Graf static const int rta_max[RTM_NR_FAMILIES] =
4171da177e4SLinus Torvalds {
418f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
419f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
420f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
42114c0b97dSThomas Graf 	[RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
422f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
423f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
424f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
425f90a0a74SThomas Graf 	[RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
4261da177e4SLinus Torvalds };
4271da177e4SLinus Torvalds 
4281da177e4SLinus Torvalds void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
4291da177e4SLinus Torvalds {
4301da177e4SLinus Torvalds 	struct rtattr *rta;
4311da177e4SLinus Torvalds 	int size = RTA_LENGTH(attrlen);
4321da177e4SLinus Torvalds 
4331da177e4SLinus Torvalds 	rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
4341da177e4SLinus Torvalds 	rta->rta_type = attrtype;
4351da177e4SLinus Torvalds 	rta->rta_len = size;
4361da177e4SLinus Torvalds 	memcpy(RTA_DATA(rta), data, attrlen);
437b3563c4fSPatrick McHardy 	memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
4381da177e4SLinus Torvalds }
439e0d087afSEric Dumazet EXPORT_SYMBOL(__rta_fill);
4401da177e4SLinus Torvalds 
44197c53cacSDenis V. Lunev int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
4421da177e4SLinus Torvalds {
44397c53cacSDenis V. Lunev 	struct sock *rtnl = net->rtnl;
4441da177e4SLinus Torvalds 	int err = 0;
4451da177e4SLinus Torvalds 
446ac6d439dSPatrick McHardy 	NETLINK_CB(skb).dst_group = group;
4471da177e4SLinus Torvalds 	if (echo)
4481da177e4SLinus Torvalds 		atomic_inc(&skb->users);
4491da177e4SLinus Torvalds 	netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
4501da177e4SLinus Torvalds 	if (echo)
4511da177e4SLinus Torvalds 		err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
4521da177e4SLinus Torvalds 	return err;
4531da177e4SLinus Torvalds }
4541da177e4SLinus Torvalds 
45597c53cacSDenis V. Lunev int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
4562942e900SThomas Graf {
45797c53cacSDenis V. Lunev 	struct sock *rtnl = net->rtnl;
45897c53cacSDenis V. Lunev 
4592942e900SThomas Graf 	return nlmsg_unicast(rtnl, skb, pid);
4602942e900SThomas Graf }
461e0d087afSEric Dumazet EXPORT_SYMBOL(rtnl_unicast);
4622942e900SThomas Graf 
4631ce85fe4SPablo Neira Ayuso void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
46497676b6bSThomas Graf 		 struct nlmsghdr *nlh, gfp_t flags)
46597676b6bSThomas Graf {
46697c53cacSDenis V. Lunev 	struct sock *rtnl = net->rtnl;
46797676b6bSThomas Graf 	int report = 0;
46897676b6bSThomas Graf 
46997676b6bSThomas Graf 	if (nlh)
47097676b6bSThomas Graf 		report = nlmsg_report(nlh);
47197676b6bSThomas Graf 
4721ce85fe4SPablo Neira Ayuso 	nlmsg_notify(rtnl, skb, pid, group, report, flags);
47397676b6bSThomas Graf }
474e0d087afSEric Dumazet EXPORT_SYMBOL(rtnl_notify);
47597676b6bSThomas Graf 
47697c53cacSDenis V. Lunev void rtnl_set_sk_err(struct net *net, u32 group, int error)
47797676b6bSThomas Graf {
47897c53cacSDenis V. Lunev 	struct sock *rtnl = net->rtnl;
47997c53cacSDenis V. Lunev 
48097676b6bSThomas Graf 	netlink_set_err(rtnl, 0, group, error);
48197676b6bSThomas Graf }
482e0d087afSEric Dumazet EXPORT_SYMBOL(rtnl_set_sk_err);
48397676b6bSThomas Graf 
4841da177e4SLinus Torvalds int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
4851da177e4SLinus Torvalds {
4862d7202bfSThomas Graf 	struct nlattr *mx;
4872d7202bfSThomas Graf 	int i, valid = 0;
4881da177e4SLinus Torvalds 
4892d7202bfSThomas Graf 	mx = nla_nest_start(skb, RTA_METRICS);
4902d7202bfSThomas Graf 	if (mx == NULL)
4912d7202bfSThomas Graf 		return -ENOBUFS;
4922d7202bfSThomas Graf 
4931da177e4SLinus Torvalds 	for (i = 0; i < RTAX_MAX; i++) {
4942d7202bfSThomas Graf 		if (metrics[i]) {
4952d7202bfSThomas Graf 			valid++;
4962d7202bfSThomas Graf 			NLA_PUT_U32(skb, i+1, metrics[i]);
4971da177e4SLinus Torvalds 		}
4982d7202bfSThomas Graf 	}
4991da177e4SLinus Torvalds 
500a57d27fcSDavid S. Miller 	if (!valid) {
501a57d27fcSDavid S. Miller 		nla_nest_cancel(skb, mx);
502a57d27fcSDavid S. Miller 		return 0;
503a57d27fcSDavid S. Miller 	}
5042d7202bfSThomas Graf 
5052d7202bfSThomas Graf 	return nla_nest_end(skb, mx);
5062d7202bfSThomas Graf 
5072d7202bfSThomas Graf nla_put_failure:
508bc3ed28cSThomas Graf 	nla_nest_cancel(skb, mx);
509bc3ed28cSThomas Graf 	return -EMSGSIZE;
5101da177e4SLinus Torvalds }
511e0d087afSEric Dumazet EXPORT_SYMBOL(rtnetlink_put_metrics);
5121da177e4SLinus Torvalds 
513e3703b3dSThomas Graf int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
514e3703b3dSThomas Graf 		       u32 ts, u32 tsage, long expires, u32 error)
515e3703b3dSThomas Graf {
516e3703b3dSThomas Graf 	struct rta_cacheinfo ci = {
517e3703b3dSThomas Graf 		.rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
518e3703b3dSThomas Graf 		.rta_used = dst->__use,
519e3703b3dSThomas Graf 		.rta_clntref = atomic_read(&(dst->__refcnt)),
520e3703b3dSThomas Graf 		.rta_error = error,
521e3703b3dSThomas Graf 		.rta_id =  id,
522e3703b3dSThomas Graf 		.rta_ts = ts,
523e3703b3dSThomas Graf 		.rta_tsage = tsage,
524e3703b3dSThomas Graf 	};
525e3703b3dSThomas Graf 
526e3703b3dSThomas Graf 	if (expires)
527e3703b3dSThomas Graf 		ci.rta_expires = jiffies_to_clock_t(expires);
528e3703b3dSThomas Graf 
529e3703b3dSThomas Graf 	return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
530e3703b3dSThomas Graf }
531e3703b3dSThomas Graf EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
5321da177e4SLinus Torvalds 
53393b2d4a2SDavid S. Miller static void set_operstate(struct net_device *dev, unsigned char transition)
534b00055aaSStefan Rompf {
535b00055aaSStefan Rompf 	unsigned char operstate = dev->operstate;
536b00055aaSStefan Rompf 
537b00055aaSStefan Rompf 	switch (transition) {
538b00055aaSStefan Rompf 	case IF_OPER_UP:
539b00055aaSStefan Rompf 		if ((operstate == IF_OPER_DORMANT ||
540b00055aaSStefan Rompf 		     operstate == IF_OPER_UNKNOWN) &&
541b00055aaSStefan Rompf 		    !netif_dormant(dev))
542b00055aaSStefan Rompf 			operstate = IF_OPER_UP;
543b00055aaSStefan Rompf 		break;
544b00055aaSStefan Rompf 
545b00055aaSStefan Rompf 	case IF_OPER_DORMANT:
546b00055aaSStefan Rompf 		if (operstate == IF_OPER_UP ||
547b00055aaSStefan Rompf 		    operstate == IF_OPER_UNKNOWN)
548b00055aaSStefan Rompf 			operstate = IF_OPER_DORMANT;
549b00055aaSStefan Rompf 		break;
5503ff50b79SStephen Hemminger 	}
551b00055aaSStefan Rompf 
552b00055aaSStefan Rompf 	if (dev->operstate != operstate) {
553b00055aaSStefan Rompf 		write_lock_bh(&dev_base_lock);
554b00055aaSStefan Rompf 		dev->operstate = operstate;
555b00055aaSStefan Rompf 		write_unlock_bh(&dev_base_lock);
556b00055aaSStefan Rompf 		netdev_state_change(dev);
55793b2d4a2SDavid S. Miller 	}
558b00055aaSStefan Rompf }
559b00055aaSStefan Rompf 
5603729d502SPatrick McHardy static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
5613729d502SPatrick McHardy 					   const struct ifinfomsg *ifm)
5623729d502SPatrick McHardy {
5633729d502SPatrick McHardy 	unsigned int flags = ifm->ifi_flags;
5643729d502SPatrick McHardy 
5653729d502SPatrick McHardy 	/* bugwards compatibility: ifi_change == 0 is treated as ~0 */
5663729d502SPatrick McHardy 	if (ifm->ifi_change)
5673729d502SPatrick McHardy 		flags = (flags & ifm->ifi_change) |
5683729d502SPatrick McHardy 			(dev->flags & ~ifm->ifi_change);
5693729d502SPatrick McHardy 
5703729d502SPatrick McHardy 	return flags;
5713729d502SPatrick McHardy }
5723729d502SPatrick McHardy 
573b60c5115SThomas Graf static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
574eeda3fd6SStephen Hemminger 				 const struct net_device_stats *b)
5751da177e4SLinus Torvalds {
576b60c5115SThomas Graf 	a->rx_packets = b->rx_packets;
577b60c5115SThomas Graf 	a->tx_packets = b->tx_packets;
578b60c5115SThomas Graf 	a->rx_bytes = b->rx_bytes;
579b60c5115SThomas Graf 	a->tx_bytes = b->tx_bytes;
580b60c5115SThomas Graf 	a->rx_errors = b->rx_errors;
581b60c5115SThomas Graf 	a->tx_errors = b->tx_errors;
582b60c5115SThomas Graf 	a->rx_dropped = b->rx_dropped;
583b60c5115SThomas Graf 	a->tx_dropped = b->tx_dropped;
584b60c5115SThomas Graf 
585b60c5115SThomas Graf 	a->multicast = b->multicast;
586b60c5115SThomas Graf 	a->collisions = b->collisions;
587b60c5115SThomas Graf 
588b60c5115SThomas Graf 	a->rx_length_errors = b->rx_length_errors;
589b60c5115SThomas Graf 	a->rx_over_errors = b->rx_over_errors;
590b60c5115SThomas Graf 	a->rx_crc_errors = b->rx_crc_errors;
591b60c5115SThomas Graf 	a->rx_frame_errors = b->rx_frame_errors;
592b60c5115SThomas Graf 	a->rx_fifo_errors = b->rx_fifo_errors;
593b60c5115SThomas Graf 	a->rx_missed_errors = b->rx_missed_errors;
594b60c5115SThomas Graf 
595b60c5115SThomas Graf 	a->tx_aborted_errors = b->tx_aborted_errors;
596b60c5115SThomas Graf 	a->tx_carrier_errors = b->tx_carrier_errors;
597b60c5115SThomas Graf 	a->tx_fifo_errors = b->tx_fifo_errors;
598b60c5115SThomas Graf 	a->tx_heartbeat_errors = b->tx_heartbeat_errors;
599b60c5115SThomas Graf 	a->tx_window_errors = b->tx_window_errors;
600b60c5115SThomas Graf 
601b60c5115SThomas Graf 	a->rx_compressed = b->rx_compressed;
602b60c5115SThomas Graf 	a->tx_compressed = b->tx_compressed;
603*10708f37SJan Engelhardt }
604*10708f37SJan Engelhardt 
605*10708f37SJan Engelhardt static void copy_rtnl_link_stats64(struct rtnl_link_stats64 *a,
606*10708f37SJan Engelhardt 				   const struct net_device_stats *b)
607*10708f37SJan Engelhardt {
608*10708f37SJan Engelhardt 	a->rx_packets = b->rx_packets;
609*10708f37SJan Engelhardt 	a->tx_packets = b->tx_packets;
610*10708f37SJan Engelhardt 	a->rx_bytes = b->rx_bytes;
611*10708f37SJan Engelhardt 	a->tx_bytes = b->tx_bytes;
612*10708f37SJan Engelhardt 	a->rx_errors = b->rx_errors;
613*10708f37SJan Engelhardt 	a->tx_errors = b->tx_errors;
614*10708f37SJan Engelhardt 	a->rx_dropped = b->rx_dropped;
615*10708f37SJan Engelhardt 	a->tx_dropped = b->tx_dropped;
616*10708f37SJan Engelhardt 
617*10708f37SJan Engelhardt 	a->multicast = b->multicast;
618*10708f37SJan Engelhardt 	a->collisions = b->collisions;
619*10708f37SJan Engelhardt 
620*10708f37SJan Engelhardt 	a->rx_length_errors = b->rx_length_errors;
621*10708f37SJan Engelhardt 	a->rx_over_errors = b->rx_over_errors;
622*10708f37SJan Engelhardt 	a->rx_crc_errors = b->rx_crc_errors;
623*10708f37SJan Engelhardt 	a->rx_frame_errors = b->rx_frame_errors;
624*10708f37SJan Engelhardt 	a->rx_fifo_errors = b->rx_fifo_errors;
625*10708f37SJan Engelhardt 	a->rx_missed_errors = b->rx_missed_errors;
626*10708f37SJan Engelhardt 
627*10708f37SJan Engelhardt 	a->tx_aborted_errors = b->tx_aborted_errors;
628*10708f37SJan Engelhardt 	a->tx_carrier_errors = b->tx_carrier_errors;
629*10708f37SJan Engelhardt 	a->tx_fifo_errors = b->tx_fifo_errors;
630*10708f37SJan Engelhardt 	a->tx_heartbeat_errors = b->tx_heartbeat_errors;
631*10708f37SJan Engelhardt 	a->tx_window_errors = b->tx_window_errors;
632*10708f37SJan Engelhardt 
633*10708f37SJan Engelhardt 	a->rx_compressed = b->rx_compressed;
634*10708f37SJan Engelhardt 	a->tx_compressed = b->tx_compressed;
635*10708f37SJan Engelhardt }
636b60c5115SThomas Graf 
637ebc08a6fSWilliams, Mitch A static inline int rtnl_vfinfo_size(const struct net_device *dev)
638ebc08a6fSWilliams, Mitch A {
639ebc08a6fSWilliams, Mitch A 	if (dev->dev.parent && dev_is_pci(dev->dev.parent))
640ebc08a6fSWilliams, Mitch A 		return dev_num_vf(dev->dev.parent) *
641ebc08a6fSWilliams, Mitch A 			sizeof(struct ifla_vf_info);
642ebc08a6fSWilliams, Mitch A 	else
643ebc08a6fSWilliams, Mitch A 		return 0;
644ebc08a6fSWilliams, Mitch A }
645ebc08a6fSWilliams, Mitch A 
64638f7b870SPatrick McHardy static inline size_t if_nlmsg_size(const struct net_device *dev)
647339bf98fSThomas Graf {
648339bf98fSThomas Graf 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
649339bf98fSThomas Graf 	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
6500b815a1aSStephen Hemminger 	       + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
651339bf98fSThomas Graf 	       + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
652339bf98fSThomas Graf 	       + nla_total_size(sizeof(struct rtnl_link_ifmap))
653339bf98fSThomas Graf 	       + nla_total_size(sizeof(struct rtnl_link_stats))
654339bf98fSThomas Graf 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
655339bf98fSThomas Graf 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
656339bf98fSThomas Graf 	       + nla_total_size(4) /* IFLA_TXQLEN */
657339bf98fSThomas Graf 	       + nla_total_size(4) /* IFLA_WEIGHT */
658339bf98fSThomas Graf 	       + nla_total_size(4) /* IFLA_MTU */
659339bf98fSThomas Graf 	       + nla_total_size(4) /* IFLA_LINK */
660339bf98fSThomas Graf 	       + nla_total_size(4) /* IFLA_MASTER */
661339bf98fSThomas Graf 	       + nla_total_size(1) /* IFLA_OPERSTATE */
66238f7b870SPatrick McHardy 	       + nla_total_size(1) /* IFLA_LINKMODE */
663ebc08a6fSWilliams, Mitch A 	       + nla_total_size(4) /* IFLA_NUM_VF */
664ebc08a6fSWilliams, Mitch A 	       + nla_total_size(rtnl_vfinfo_size(dev)) /* IFLA_VFINFO */
66538f7b870SPatrick McHardy 	       + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
666339bf98fSThomas Graf }
667339bf98fSThomas Graf 
668b60c5115SThomas Graf static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
669575c3e2aSPatrick McHardy 			    int type, u32 pid, u32 seq, u32 change,
670575c3e2aSPatrick McHardy 			    unsigned int flags)
671b60c5115SThomas Graf {
672b60c5115SThomas Graf 	struct ifinfomsg *ifm;
6731da177e4SLinus Torvalds 	struct nlmsghdr *nlh;
674eeda3fd6SStephen Hemminger 	const struct net_device_stats *stats;
67596e74088SPavel Emelyanov 	struct nlattr *attr;
6761da177e4SLinus Torvalds 
677b60c5115SThomas Graf 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
678b60c5115SThomas Graf 	if (nlh == NULL)
67926932566SPatrick McHardy 		return -EMSGSIZE;
6801da177e4SLinus Torvalds 
681b60c5115SThomas Graf 	ifm = nlmsg_data(nlh);
682b60c5115SThomas Graf 	ifm->ifi_family = AF_UNSPEC;
683b60c5115SThomas Graf 	ifm->__ifi_pad = 0;
684b60c5115SThomas Graf 	ifm->ifi_type = dev->type;
685b60c5115SThomas Graf 	ifm->ifi_index = dev->ifindex;
686b60c5115SThomas Graf 	ifm->ifi_flags = dev_get_flags(dev);
687b60c5115SThomas Graf 	ifm->ifi_change = change;
6881da177e4SLinus Torvalds 
689b60c5115SThomas Graf 	NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
690b60c5115SThomas Graf 	NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
691b60c5115SThomas Graf 	NLA_PUT_U8(skb, IFLA_OPERSTATE,
692b60c5115SThomas Graf 		   netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
693b60c5115SThomas Graf 	NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
694b60c5115SThomas Graf 	NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
6951da177e4SLinus Torvalds 
696b60c5115SThomas Graf 	if (dev->ifindex != dev->iflink)
697b60c5115SThomas Graf 		NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
6981da177e4SLinus Torvalds 
699b60c5115SThomas Graf 	if (dev->master)
700b60c5115SThomas Graf 		NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
701b60c5115SThomas Graf 
702af356afaSPatrick McHardy 	if (dev->qdisc)
703af356afaSPatrick McHardy 		NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
704b00055aaSStefan Rompf 
7050b815a1aSStephen Hemminger 	if (dev->ifalias)
7060b815a1aSStephen Hemminger 		NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
7070b815a1aSStephen Hemminger 
708b00055aaSStefan Rompf 	if (1) {
7091da177e4SLinus Torvalds 		struct rtnl_link_ifmap map = {
7101da177e4SLinus Torvalds 			.mem_start   = dev->mem_start,
7111da177e4SLinus Torvalds 			.mem_end     = dev->mem_end,
7121da177e4SLinus Torvalds 			.base_addr   = dev->base_addr,
7131da177e4SLinus Torvalds 			.irq         = dev->irq,
7141da177e4SLinus Torvalds 			.dma         = dev->dma,
7151da177e4SLinus Torvalds 			.port        = dev->if_port,
7161da177e4SLinus Torvalds 		};
717b60c5115SThomas Graf 		NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
7181da177e4SLinus Torvalds 	}
7191da177e4SLinus Torvalds 
7201da177e4SLinus Torvalds 	if (dev->addr_len) {
721b60c5115SThomas Graf 		NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
722b60c5115SThomas Graf 		NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
7231da177e4SLinus Torvalds 	}
7241da177e4SLinus Torvalds 
725b60c5115SThomas Graf 	attr = nla_reserve(skb, IFLA_STATS,
726b60c5115SThomas Graf 			sizeof(struct rtnl_link_stats));
727b60c5115SThomas Graf 	if (attr == NULL)
728b60c5115SThomas Graf 		goto nla_put_failure;
729b60c5115SThomas Graf 
730eeda3fd6SStephen Hemminger 	stats = dev_get_stats(dev);
731b60c5115SThomas Graf 	copy_rtnl_link_stats(nla_data(attr), stats);
7321da177e4SLinus Torvalds 
733*10708f37SJan Engelhardt 	attr = nla_reserve(skb, IFLA_STATS64,
734*10708f37SJan Engelhardt 			sizeof(struct rtnl_link_stats64));
735*10708f37SJan Engelhardt 	if (attr == NULL)
736*10708f37SJan Engelhardt 		goto nla_put_failure;
737*10708f37SJan Engelhardt 
738*10708f37SJan Engelhardt 	stats = dev_get_stats(dev);
739*10708f37SJan Engelhardt 	copy_rtnl_link_stats64(nla_data(attr), stats);
740*10708f37SJan Engelhardt 
741ebc08a6fSWilliams, Mitch A 	if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
742ebc08a6fSWilliams, Mitch A 		int i;
743ebc08a6fSWilliams, Mitch A 		struct ifla_vf_info ivi;
744ebc08a6fSWilliams, Mitch A 
745ebc08a6fSWilliams, Mitch A 		NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
746ebc08a6fSWilliams, Mitch A 		for (i = 0; i < dev_num_vf(dev->dev.parent); i++) {
747ebc08a6fSWilliams, Mitch A 			if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
748ebc08a6fSWilliams, Mitch A 				break;
749ebc08a6fSWilliams, Mitch A 			NLA_PUT(skb, IFLA_VFINFO, sizeof(ivi), &ivi);
750ebc08a6fSWilliams, Mitch A 		}
751ebc08a6fSWilliams, Mitch A 	}
75238f7b870SPatrick McHardy 	if (dev->rtnl_link_ops) {
75338f7b870SPatrick McHardy 		if (rtnl_link_fill(skb, dev) < 0)
75438f7b870SPatrick McHardy 			goto nla_put_failure;
75538f7b870SPatrick McHardy 	}
75638f7b870SPatrick McHardy 
757b60c5115SThomas Graf 	return nlmsg_end(skb, nlh);
758b60c5115SThomas Graf 
759b60c5115SThomas Graf nla_put_failure:
76026932566SPatrick McHardy 	nlmsg_cancel(skb, nlh);
76126932566SPatrick McHardy 	return -EMSGSIZE;
7621da177e4SLinus Torvalds }
7631da177e4SLinus Torvalds 
764b60c5115SThomas Graf static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
7651da177e4SLinus Torvalds {
7663b1e0a65SYOSHIFUJI Hideaki 	struct net *net = sock_net(skb->sk);
7677c28bd0bSEric Dumazet 	int h, s_h;
7687c28bd0bSEric Dumazet 	int idx = 0, s_idx;
7691da177e4SLinus Torvalds 	struct net_device *dev;
7707c28bd0bSEric Dumazet 	struct hlist_head *head;
7717c28bd0bSEric Dumazet 	struct hlist_node *node;
7721da177e4SLinus Torvalds 
7737c28bd0bSEric Dumazet 	s_h = cb->args[0];
7747c28bd0bSEric Dumazet 	s_idx = cb->args[1];
7757c28bd0bSEric Dumazet 
7767c28bd0bSEric Dumazet 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
7777562f876SPavel Emelianov 		idx = 0;
7787c28bd0bSEric Dumazet 		head = &net->dev_index_head[h];
7797c28bd0bSEric Dumazet 		hlist_for_each_entry(dev, node, head, index_hlist) {
7801da177e4SLinus Torvalds 			if (idx < s_idx)
7817562f876SPavel Emelianov 				goto cont;
782575c3e2aSPatrick McHardy 			if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
783b6544c0bSJamal Hadi Salim 					     NETLINK_CB(cb->skb).pid,
7847c28bd0bSEric Dumazet 					     cb->nlh->nlmsg_seq, 0,
7857c28bd0bSEric Dumazet 					     NLM_F_MULTI) <= 0)
7867c28bd0bSEric Dumazet 				goto out;
7877562f876SPavel Emelianov cont:
7887562f876SPavel Emelianov 			idx++;
7891da177e4SLinus Torvalds 		}
7907c28bd0bSEric Dumazet 	}
7917c28bd0bSEric Dumazet out:
7927c28bd0bSEric Dumazet 	cb->args[1] = idx;
7937c28bd0bSEric Dumazet 	cb->args[0] = h;
7941da177e4SLinus Torvalds 
7951da177e4SLinus Torvalds 	return skb->len;
7961da177e4SLinus Torvalds }
7971da177e4SLinus Torvalds 
798e7199288SPavel Emelianov const struct nla_policy ifla_policy[IFLA_MAX+1] = {
7995176f91eSThomas Graf 	[IFLA_IFNAME]		= { .type = NLA_STRING, .len = IFNAMSIZ-1 },
80038f7b870SPatrick McHardy 	[IFLA_ADDRESS]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
80138f7b870SPatrick McHardy 	[IFLA_BROADCAST]	= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
8025176f91eSThomas Graf 	[IFLA_MAP]		= { .len = sizeof(struct rtnl_link_ifmap) },
803da5e0494SThomas Graf 	[IFLA_MTU]		= { .type = NLA_U32 },
80476e87306SThomas Graf 	[IFLA_LINK]		= { .type = NLA_U32 },
805da5e0494SThomas Graf 	[IFLA_TXQLEN]		= { .type = NLA_U32 },
806da5e0494SThomas Graf 	[IFLA_WEIGHT]		= { .type = NLA_U32 },
807da5e0494SThomas Graf 	[IFLA_OPERSTATE]	= { .type = NLA_U8 },
808da5e0494SThomas Graf 	[IFLA_LINKMODE]		= { .type = NLA_U8 },
80976e87306SThomas Graf 	[IFLA_LINKINFO]		= { .type = NLA_NESTED },
810d8a5ec67SEric W. Biederman 	[IFLA_NET_NS_PID]	= { .type = NLA_U32 },
8110b815a1aSStephen Hemminger 	[IFLA_IFALIAS]	        = { .type = NLA_STRING, .len = IFALIASZ-1 },
812ebc08a6fSWilliams, Mitch A 	[IFLA_VF_MAC]		= { .type = NLA_BINARY,
813ebc08a6fSWilliams, Mitch A 				    .len = sizeof(struct ifla_vf_mac) },
814ebc08a6fSWilliams, Mitch A 	[IFLA_VF_VLAN]		= { .type = NLA_BINARY,
815ebc08a6fSWilliams, Mitch A 				    .len = sizeof(struct ifla_vf_vlan) },
816ebc08a6fSWilliams, Mitch A 	[IFLA_VF_TX_RATE]	= { .type = NLA_BINARY,
817ebc08a6fSWilliams, Mitch A 				    .len = sizeof(struct ifla_vf_tx_rate) },
818da5e0494SThomas Graf };
819e0d087afSEric Dumazet EXPORT_SYMBOL(ifla_policy);
8201da177e4SLinus Torvalds 
82138f7b870SPatrick McHardy static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
82238f7b870SPatrick McHardy 	[IFLA_INFO_KIND]	= { .type = NLA_STRING },
82338f7b870SPatrick McHardy 	[IFLA_INFO_DATA]	= { .type = NLA_NESTED },
82438f7b870SPatrick McHardy };
82538f7b870SPatrick McHardy 
82681adee47SEric W. Biederman struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
82781adee47SEric W. Biederman {
82881adee47SEric W. Biederman 	struct net *net;
82981adee47SEric W. Biederman 	/* Examine the link attributes and figure out which
83081adee47SEric W. Biederman 	 * network namespace we are talking about.
83181adee47SEric W. Biederman 	 */
83281adee47SEric W. Biederman 	if (tb[IFLA_NET_NS_PID])
83381adee47SEric W. Biederman 		net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
83481adee47SEric W. Biederman 	else
83581adee47SEric W. Biederman 		net = get_net(src_net);
83681adee47SEric W. Biederman 	return net;
83781adee47SEric W. Biederman }
83881adee47SEric W. Biederman EXPORT_SYMBOL(rtnl_link_get_net);
83981adee47SEric W. Biederman 
8401840bb13SThomas Graf static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
8411840bb13SThomas Graf {
8421840bb13SThomas Graf 	if (dev) {
8431840bb13SThomas Graf 		if (tb[IFLA_ADDRESS] &&
8441840bb13SThomas Graf 		    nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
8451840bb13SThomas Graf 			return -EINVAL;
8461840bb13SThomas Graf 
8471840bb13SThomas Graf 		if (tb[IFLA_BROADCAST] &&
8481840bb13SThomas Graf 		    nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
8491840bb13SThomas Graf 			return -EINVAL;
8501840bb13SThomas Graf 	}
8511840bb13SThomas Graf 
8521840bb13SThomas Graf 	return 0;
8531840bb13SThomas Graf }
8541840bb13SThomas Graf 
8550157f60cSPatrick McHardy static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
85638f7b870SPatrick McHardy 		      struct nlattr **tb, char *ifname, int modified)
8570157f60cSPatrick McHardy {
858d314774cSStephen Hemminger 	const struct net_device_ops *ops = dev->netdev_ops;
85938f7b870SPatrick McHardy 	int send_addr_notify = 0;
8600157f60cSPatrick McHardy 	int err;
8610157f60cSPatrick McHardy 
862d8a5ec67SEric W. Biederman 	if (tb[IFLA_NET_NS_PID]) {
86381adee47SEric W. Biederman 		struct net *net = rtnl_link_get_net(dev_net(dev), tb);
864d8a5ec67SEric W. Biederman 		if (IS_ERR(net)) {
865d8a5ec67SEric W. Biederman 			err = PTR_ERR(net);
866d8a5ec67SEric W. Biederman 			goto errout;
867d8a5ec67SEric W. Biederman 		}
868d8a5ec67SEric W. Biederman 		err = dev_change_net_namespace(dev, net, ifname);
869d8a5ec67SEric W. Biederman 		put_net(net);
870d8a5ec67SEric W. Biederman 		if (err)
871d8a5ec67SEric W. Biederman 			goto errout;
872d8a5ec67SEric W. Biederman 		modified = 1;
873d8a5ec67SEric W. Biederman 	}
874d8a5ec67SEric W. Biederman 
8750157f60cSPatrick McHardy 	if (tb[IFLA_MAP]) {
8760157f60cSPatrick McHardy 		struct rtnl_link_ifmap *u_map;
8770157f60cSPatrick McHardy 		struct ifmap k_map;
8780157f60cSPatrick McHardy 
879d314774cSStephen Hemminger 		if (!ops->ndo_set_config) {
8800157f60cSPatrick McHardy 			err = -EOPNOTSUPP;
8810157f60cSPatrick McHardy 			goto errout;
8820157f60cSPatrick McHardy 		}
8830157f60cSPatrick McHardy 
8840157f60cSPatrick McHardy 		if (!netif_device_present(dev)) {
8850157f60cSPatrick McHardy 			err = -ENODEV;
8860157f60cSPatrick McHardy 			goto errout;
8870157f60cSPatrick McHardy 		}
8880157f60cSPatrick McHardy 
8890157f60cSPatrick McHardy 		u_map = nla_data(tb[IFLA_MAP]);
8900157f60cSPatrick McHardy 		k_map.mem_start = (unsigned long) u_map->mem_start;
8910157f60cSPatrick McHardy 		k_map.mem_end = (unsigned long) u_map->mem_end;
8920157f60cSPatrick McHardy 		k_map.base_addr = (unsigned short) u_map->base_addr;
8930157f60cSPatrick McHardy 		k_map.irq = (unsigned char) u_map->irq;
8940157f60cSPatrick McHardy 		k_map.dma = (unsigned char) u_map->dma;
8950157f60cSPatrick McHardy 		k_map.port = (unsigned char) u_map->port;
8960157f60cSPatrick McHardy 
897d314774cSStephen Hemminger 		err = ops->ndo_set_config(dev, &k_map);
8980157f60cSPatrick McHardy 		if (err < 0)
8990157f60cSPatrick McHardy 			goto errout;
9000157f60cSPatrick McHardy 
9010157f60cSPatrick McHardy 		modified = 1;
9020157f60cSPatrick McHardy 	}
9030157f60cSPatrick McHardy 
9040157f60cSPatrick McHardy 	if (tb[IFLA_ADDRESS]) {
9050157f60cSPatrick McHardy 		struct sockaddr *sa;
9060157f60cSPatrick McHardy 		int len;
9070157f60cSPatrick McHardy 
908d314774cSStephen Hemminger 		if (!ops->ndo_set_mac_address) {
9090157f60cSPatrick McHardy 			err = -EOPNOTSUPP;
9100157f60cSPatrick McHardy 			goto errout;
9110157f60cSPatrick McHardy 		}
9120157f60cSPatrick McHardy 
9130157f60cSPatrick McHardy 		if (!netif_device_present(dev)) {
9140157f60cSPatrick McHardy 			err = -ENODEV;
9150157f60cSPatrick McHardy 			goto errout;
9160157f60cSPatrick McHardy 		}
9170157f60cSPatrick McHardy 
9180157f60cSPatrick McHardy 		len = sizeof(sa_family_t) + dev->addr_len;
9190157f60cSPatrick McHardy 		sa = kmalloc(len, GFP_KERNEL);
9200157f60cSPatrick McHardy 		if (!sa) {
9210157f60cSPatrick McHardy 			err = -ENOMEM;
9220157f60cSPatrick McHardy 			goto errout;
9230157f60cSPatrick McHardy 		}
9240157f60cSPatrick McHardy 		sa->sa_family = dev->type;
9250157f60cSPatrick McHardy 		memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
9260157f60cSPatrick McHardy 		       dev->addr_len);
927d314774cSStephen Hemminger 		err = ops->ndo_set_mac_address(dev, sa);
9280157f60cSPatrick McHardy 		kfree(sa);
9290157f60cSPatrick McHardy 		if (err)
9300157f60cSPatrick McHardy 			goto errout;
9310157f60cSPatrick McHardy 		send_addr_notify = 1;
9320157f60cSPatrick McHardy 		modified = 1;
9330157f60cSPatrick McHardy 	}
9340157f60cSPatrick McHardy 
9350157f60cSPatrick McHardy 	if (tb[IFLA_MTU]) {
9360157f60cSPatrick McHardy 		err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
9370157f60cSPatrick McHardy 		if (err < 0)
9380157f60cSPatrick McHardy 			goto errout;
9390157f60cSPatrick McHardy 		modified = 1;
9400157f60cSPatrick McHardy 	}
9410157f60cSPatrick McHardy 
9420157f60cSPatrick McHardy 	/*
9430157f60cSPatrick McHardy 	 * Interface selected by interface index but interface
9440157f60cSPatrick McHardy 	 * name provided implies that a name change has been
9450157f60cSPatrick McHardy 	 * requested.
9460157f60cSPatrick McHardy 	 */
9470157f60cSPatrick McHardy 	if (ifm->ifi_index > 0 && ifname[0]) {
9480157f60cSPatrick McHardy 		err = dev_change_name(dev, ifname);
9490157f60cSPatrick McHardy 		if (err < 0)
9500157f60cSPatrick McHardy 			goto errout;
9510157f60cSPatrick McHardy 		modified = 1;
9520157f60cSPatrick McHardy 	}
9530157f60cSPatrick McHardy 
9540b815a1aSStephen Hemminger 	if (tb[IFLA_IFALIAS]) {
9550b815a1aSStephen Hemminger 		err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
9560b815a1aSStephen Hemminger 				    nla_len(tb[IFLA_IFALIAS]));
9570b815a1aSStephen Hemminger 		if (err < 0)
9580b815a1aSStephen Hemminger 			goto errout;
9590b815a1aSStephen Hemminger 		modified = 1;
9600b815a1aSStephen Hemminger 	}
9610b815a1aSStephen Hemminger 
9620157f60cSPatrick McHardy 	if (tb[IFLA_BROADCAST]) {
9630157f60cSPatrick McHardy 		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
9640157f60cSPatrick McHardy 		send_addr_notify = 1;
9650157f60cSPatrick McHardy 	}
9660157f60cSPatrick McHardy 
9670157f60cSPatrick McHardy 	if (ifm->ifi_flags || ifm->ifi_change) {
9683729d502SPatrick McHardy 		err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
9695f9021cfSJohannes Berg 		if (err < 0)
9705f9021cfSJohannes Berg 			goto errout;
9710157f60cSPatrick McHardy 	}
9720157f60cSPatrick McHardy 
97393b2d4a2SDavid S. Miller 	if (tb[IFLA_TXQLEN])
9740157f60cSPatrick McHardy 		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
9750157f60cSPatrick McHardy 
9760157f60cSPatrick McHardy 	if (tb[IFLA_OPERSTATE])
97793b2d4a2SDavid S. Miller 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
9780157f60cSPatrick McHardy 
9790157f60cSPatrick McHardy 	if (tb[IFLA_LINKMODE]) {
9800157f60cSPatrick McHardy 		write_lock_bh(&dev_base_lock);
9810157f60cSPatrick McHardy 		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
98293b2d4a2SDavid S. Miller 		write_unlock_bh(&dev_base_lock);
9830157f60cSPatrick McHardy 	}
9840157f60cSPatrick McHardy 
985ebc08a6fSWilliams, Mitch A 	if (tb[IFLA_VF_MAC]) {
986ebc08a6fSWilliams, Mitch A 		struct ifla_vf_mac *ivm;
987ebc08a6fSWilliams, Mitch A 		ivm = nla_data(tb[IFLA_VF_MAC]);
9884edb2466SWilliams, Mitch A 		err = -EOPNOTSUPP;
989ebc08a6fSWilliams, Mitch A 		if (ops->ndo_set_vf_mac)
990ebc08a6fSWilliams, Mitch A 			err = ops->ndo_set_vf_mac(dev, ivm->vf, ivm->mac);
991ebc08a6fSWilliams, Mitch A 		if (err < 0)
992ebc08a6fSWilliams, Mitch A 			goto errout;
993ebc08a6fSWilliams, Mitch A 		modified = 1;
994ebc08a6fSWilliams, Mitch A 	}
995ebc08a6fSWilliams, Mitch A 
996ebc08a6fSWilliams, Mitch A 	if (tb[IFLA_VF_VLAN]) {
997ebc08a6fSWilliams, Mitch A 		struct ifla_vf_vlan *ivv;
998ebc08a6fSWilliams, Mitch A 		ivv = nla_data(tb[IFLA_VF_VLAN]);
9994edb2466SWilliams, Mitch A 		err = -EOPNOTSUPP;
1000ebc08a6fSWilliams, Mitch A 		if (ops->ndo_set_vf_vlan)
1001ebc08a6fSWilliams, Mitch A 			err = ops->ndo_set_vf_vlan(dev, ivv->vf,
10024edb2466SWilliams, Mitch A 						   ivv->vlan,
10034edb2466SWilliams, Mitch A 						   ivv->qos);
1004ebc08a6fSWilliams, Mitch A 		if (err < 0)
1005ebc08a6fSWilliams, Mitch A 			goto errout;
1006ebc08a6fSWilliams, Mitch A 		modified = 1;
1007ebc08a6fSWilliams, Mitch A 	}
1008ebc08a6fSWilliams, Mitch A 	err = 0;
1009ebc08a6fSWilliams, Mitch A 
1010ebc08a6fSWilliams, Mitch A 	if (tb[IFLA_VF_TX_RATE]) {
1011ebc08a6fSWilliams, Mitch A 		struct ifla_vf_tx_rate *ivt;
1012ebc08a6fSWilliams, Mitch A 		ivt = nla_data(tb[IFLA_VF_TX_RATE]);
10134edb2466SWilliams, Mitch A 		err = -EOPNOTSUPP;
1014ebc08a6fSWilliams, Mitch A 		if (ops->ndo_set_vf_tx_rate)
1015ebc08a6fSWilliams, Mitch A 			err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, ivt->rate);
1016ebc08a6fSWilliams, Mitch A 		if (err < 0)
1017ebc08a6fSWilliams, Mitch A 			goto errout;
1018ebc08a6fSWilliams, Mitch A 		modified = 1;
1019ebc08a6fSWilliams, Mitch A 	}
10200157f60cSPatrick McHardy 	err = 0;
10210157f60cSPatrick McHardy 
10220157f60cSPatrick McHardy errout:
10230157f60cSPatrick McHardy 	if (err < 0 && modified && net_ratelimit())
10240157f60cSPatrick McHardy 		printk(KERN_WARNING "A link change request failed with "
10250157f60cSPatrick McHardy 		       "some changes comitted already. Interface %s may "
10260157f60cSPatrick McHardy 		       "have been left with an inconsistent configuration, "
10270157f60cSPatrick McHardy 		       "please check.\n", dev->name);
10280157f60cSPatrick McHardy 
10290157f60cSPatrick McHardy 	if (send_addr_notify)
10300157f60cSPatrick McHardy 		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
10310157f60cSPatrick McHardy 	return err;
10320157f60cSPatrick McHardy }
10330157f60cSPatrick McHardy 
1034da5e0494SThomas Graf static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1035da5e0494SThomas Graf {
10363b1e0a65SYOSHIFUJI Hideaki 	struct net *net = sock_net(skb->sk);
1037da5e0494SThomas Graf 	struct ifinfomsg *ifm;
1038da5e0494SThomas Graf 	struct net_device *dev;
10390157f60cSPatrick McHardy 	int err;
1040da5e0494SThomas Graf 	struct nlattr *tb[IFLA_MAX+1];
10411da177e4SLinus Torvalds 	char ifname[IFNAMSIZ];
10421da177e4SLinus Torvalds 
1043da5e0494SThomas Graf 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1044da5e0494SThomas Graf 	if (err < 0)
1045da5e0494SThomas Graf 		goto errout;
10461da177e4SLinus Torvalds 
10475176f91eSThomas Graf 	if (tb[IFLA_IFNAME])
10485176f91eSThomas Graf 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
104978e5b891SPatrick McHardy 	else
105078e5b891SPatrick McHardy 		ifname[0] = '\0';
10511da177e4SLinus Torvalds 
10521da177e4SLinus Torvalds 	err = -EINVAL;
1053da5e0494SThomas Graf 	ifm = nlmsg_data(nlh);
105451055be8SPatrick McHardy 	if (ifm->ifi_index > 0)
1055a3d12891SEric Dumazet 		dev = __dev_get_by_index(net, ifm->ifi_index);
1056da5e0494SThomas Graf 	else if (tb[IFLA_IFNAME])
1057a3d12891SEric Dumazet 		dev = __dev_get_by_name(net, ifname);
1058da5e0494SThomas Graf 	else
1059da5e0494SThomas Graf 		goto errout;
10601da177e4SLinus Torvalds 
1061da5e0494SThomas Graf 	if (dev == NULL) {
1062da5e0494SThomas Graf 		err = -ENODEV;
1063da5e0494SThomas Graf 		goto errout;
1064da5e0494SThomas Graf 	}
10651da177e4SLinus Torvalds 
1066e0d087afSEric Dumazet 	err = validate_linkmsg(dev, tb);
1067e0d087afSEric Dumazet 	if (err < 0)
1068a3d12891SEric Dumazet 		goto errout;
1069da5e0494SThomas Graf 
107038f7b870SPatrick McHardy 	err = do_setlink(dev, ifm, tb, ifname, 0);
1071da5e0494SThomas Graf errout:
10721da177e4SLinus Torvalds 	return err;
10731da177e4SLinus Torvalds }
10741da177e4SLinus Torvalds 
107538f7b870SPatrick McHardy static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
107638f7b870SPatrick McHardy {
10773b1e0a65SYOSHIFUJI Hideaki 	struct net *net = sock_net(skb->sk);
107838f7b870SPatrick McHardy 	const struct rtnl_link_ops *ops;
107938f7b870SPatrick McHardy 	struct net_device *dev;
108038f7b870SPatrick McHardy 	struct ifinfomsg *ifm;
108138f7b870SPatrick McHardy 	char ifname[IFNAMSIZ];
108238f7b870SPatrick McHardy 	struct nlattr *tb[IFLA_MAX+1];
108338f7b870SPatrick McHardy 	int err;
108438f7b870SPatrick McHardy 
108538f7b870SPatrick McHardy 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
108638f7b870SPatrick McHardy 	if (err < 0)
108738f7b870SPatrick McHardy 		return err;
108838f7b870SPatrick McHardy 
108938f7b870SPatrick McHardy 	if (tb[IFLA_IFNAME])
109038f7b870SPatrick McHardy 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
109138f7b870SPatrick McHardy 
109238f7b870SPatrick McHardy 	ifm = nlmsg_data(nlh);
109338f7b870SPatrick McHardy 	if (ifm->ifi_index > 0)
1094881d966bSEric W. Biederman 		dev = __dev_get_by_index(net, ifm->ifi_index);
109538f7b870SPatrick McHardy 	else if (tb[IFLA_IFNAME])
1096881d966bSEric W. Biederman 		dev = __dev_get_by_name(net, ifname);
109738f7b870SPatrick McHardy 	else
109838f7b870SPatrick McHardy 		return -EINVAL;
109938f7b870SPatrick McHardy 
110038f7b870SPatrick McHardy 	if (!dev)
110138f7b870SPatrick McHardy 		return -ENODEV;
110238f7b870SPatrick McHardy 
110338f7b870SPatrick McHardy 	ops = dev->rtnl_link_ops;
110438f7b870SPatrick McHardy 	if (!ops)
110538f7b870SPatrick McHardy 		return -EOPNOTSUPP;
110638f7b870SPatrick McHardy 
110723289a37SEric Dumazet 	ops->dellink(dev, NULL);
110838f7b870SPatrick McHardy 	return 0;
110938f7b870SPatrick McHardy }
111038f7b870SPatrick McHardy 
11113729d502SPatrick McHardy int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
11123729d502SPatrick McHardy {
11133729d502SPatrick McHardy 	unsigned int old_flags;
11143729d502SPatrick McHardy 	int err;
11153729d502SPatrick McHardy 
11163729d502SPatrick McHardy 	old_flags = dev->flags;
11173729d502SPatrick McHardy 	if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
11183729d502SPatrick McHardy 		err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
11193729d502SPatrick McHardy 		if (err < 0)
11203729d502SPatrick McHardy 			return err;
11213729d502SPatrick McHardy 	}
11223729d502SPatrick McHardy 
11233729d502SPatrick McHardy 	dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
11243729d502SPatrick McHardy 	rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
11253729d502SPatrick McHardy 
11263729d502SPatrick McHardy 	__dev_notify_flags(dev, old_flags);
11273729d502SPatrick McHardy 	return 0;
11283729d502SPatrick McHardy }
11293729d502SPatrick McHardy EXPORT_SYMBOL(rtnl_configure_link);
11303729d502SPatrick McHardy 
113181adee47SEric W. Biederman struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
113281adee47SEric W. Biederman 	char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1133e7199288SPavel Emelianov {
1134e7199288SPavel Emelianov 	int err;
1135e7199288SPavel Emelianov 	struct net_device *dev;
11362e59af3dSEric Dumazet 	unsigned int num_queues = 1;
11372e59af3dSEric Dumazet 	unsigned int real_num_queues = 1;
1138e7199288SPavel Emelianov 
11392e59af3dSEric Dumazet 	if (ops->get_tx_queues) {
114081adee47SEric W. Biederman 		err = ops->get_tx_queues(src_net, tb, &num_queues,
1141e0d087afSEric Dumazet 					 &real_num_queues);
11422e59af3dSEric Dumazet 		if (err)
11432e59af3dSEric Dumazet 			goto err;
11442e59af3dSEric Dumazet 	}
1145e7199288SPavel Emelianov 	err = -ENOMEM;
11462e59af3dSEric Dumazet 	dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1147e7199288SPavel Emelianov 	if (!dev)
1148e7199288SPavel Emelianov 		goto err;
1149e7199288SPavel Emelianov 
115081adee47SEric W. Biederman 	dev_net_set(dev, net);
115181adee47SEric W. Biederman 	dev->rtnl_link_ops = ops;
11523729d502SPatrick McHardy 	dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
11532e59af3dSEric Dumazet 	dev->real_num_tx_queues = real_num_queues;
115481adee47SEric W. Biederman 
1155e7199288SPavel Emelianov 	if (strchr(dev->name, '%')) {
1156e7199288SPavel Emelianov 		err = dev_alloc_name(dev, dev->name);
1157e7199288SPavel Emelianov 		if (err < 0)
1158e7199288SPavel Emelianov 			goto err_free;
1159e7199288SPavel Emelianov 	}
1160e7199288SPavel Emelianov 
1161e7199288SPavel Emelianov 	if (tb[IFLA_MTU])
1162e7199288SPavel Emelianov 		dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1163e7199288SPavel Emelianov 	if (tb[IFLA_ADDRESS])
1164e7199288SPavel Emelianov 		memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1165e7199288SPavel Emelianov 				nla_len(tb[IFLA_ADDRESS]));
1166e7199288SPavel Emelianov 	if (tb[IFLA_BROADCAST])
1167e7199288SPavel Emelianov 		memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1168e7199288SPavel Emelianov 				nla_len(tb[IFLA_BROADCAST]));
1169e7199288SPavel Emelianov 	if (tb[IFLA_TXQLEN])
1170e7199288SPavel Emelianov 		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1171e7199288SPavel Emelianov 	if (tb[IFLA_OPERSTATE])
117293b2d4a2SDavid S. Miller 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1173e7199288SPavel Emelianov 	if (tb[IFLA_LINKMODE])
1174e7199288SPavel Emelianov 		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1175e7199288SPavel Emelianov 
1176e7199288SPavel Emelianov 	return dev;
1177e7199288SPavel Emelianov 
1178e7199288SPavel Emelianov err_free:
1179e7199288SPavel Emelianov 	free_netdev(dev);
1180e7199288SPavel Emelianov err:
1181e7199288SPavel Emelianov 	return ERR_PTR(err);
1182e7199288SPavel Emelianov }
1183e0d087afSEric Dumazet EXPORT_SYMBOL(rtnl_create_link);
1184e7199288SPavel Emelianov 
118538f7b870SPatrick McHardy static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
118638f7b870SPatrick McHardy {
11873b1e0a65SYOSHIFUJI Hideaki 	struct net *net = sock_net(skb->sk);
118838f7b870SPatrick McHardy 	const struct rtnl_link_ops *ops;
118938f7b870SPatrick McHardy 	struct net_device *dev;
119038f7b870SPatrick McHardy 	struct ifinfomsg *ifm;
119138f7b870SPatrick McHardy 	char kind[MODULE_NAME_LEN];
119238f7b870SPatrick McHardy 	char ifname[IFNAMSIZ];
119338f7b870SPatrick McHardy 	struct nlattr *tb[IFLA_MAX+1];
119438f7b870SPatrick McHardy 	struct nlattr *linkinfo[IFLA_INFO_MAX+1];
119538f7b870SPatrick McHardy 	int err;
119638f7b870SPatrick McHardy 
119795a5afcaSJohannes Berg #ifdef CONFIG_MODULES
119838f7b870SPatrick McHardy replay:
11998072f085SThomas Graf #endif
120038f7b870SPatrick McHardy 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
120138f7b870SPatrick McHardy 	if (err < 0)
120238f7b870SPatrick McHardy 		return err;
120338f7b870SPatrick McHardy 
120438f7b870SPatrick McHardy 	if (tb[IFLA_IFNAME])
120538f7b870SPatrick McHardy 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
120638f7b870SPatrick McHardy 	else
120738f7b870SPatrick McHardy 		ifname[0] = '\0';
120838f7b870SPatrick McHardy 
120938f7b870SPatrick McHardy 	ifm = nlmsg_data(nlh);
121038f7b870SPatrick McHardy 	if (ifm->ifi_index > 0)
1211881d966bSEric W. Biederman 		dev = __dev_get_by_index(net, ifm->ifi_index);
121238f7b870SPatrick McHardy 	else if (ifname[0])
1213881d966bSEric W. Biederman 		dev = __dev_get_by_name(net, ifname);
121438f7b870SPatrick McHardy 	else
121538f7b870SPatrick McHardy 		dev = NULL;
121638f7b870SPatrick McHardy 
1217e0d087afSEric Dumazet 	err = validate_linkmsg(dev, tb);
1218e0d087afSEric Dumazet 	if (err < 0)
12191840bb13SThomas Graf 		return err;
12201840bb13SThomas Graf 
122138f7b870SPatrick McHardy 	if (tb[IFLA_LINKINFO]) {
122238f7b870SPatrick McHardy 		err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
122338f7b870SPatrick McHardy 				       tb[IFLA_LINKINFO], ifla_info_policy);
122438f7b870SPatrick McHardy 		if (err < 0)
122538f7b870SPatrick McHardy 			return err;
122638f7b870SPatrick McHardy 	} else
122738f7b870SPatrick McHardy 		memset(linkinfo, 0, sizeof(linkinfo));
122838f7b870SPatrick McHardy 
122938f7b870SPatrick McHardy 	if (linkinfo[IFLA_INFO_KIND]) {
123038f7b870SPatrick McHardy 		nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
123138f7b870SPatrick McHardy 		ops = rtnl_link_ops_get(kind);
123238f7b870SPatrick McHardy 	} else {
123338f7b870SPatrick McHardy 		kind[0] = '\0';
123438f7b870SPatrick McHardy 		ops = NULL;
123538f7b870SPatrick McHardy 	}
123638f7b870SPatrick McHardy 
123738f7b870SPatrick McHardy 	if (1) {
123838f7b870SPatrick McHardy 		struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
123981adee47SEric W. Biederman 		struct net *dest_net;
124038f7b870SPatrick McHardy 
124138f7b870SPatrick McHardy 		if (ops) {
124238f7b870SPatrick McHardy 			if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
124338f7b870SPatrick McHardy 				err = nla_parse_nested(attr, ops->maxtype,
124438f7b870SPatrick McHardy 						       linkinfo[IFLA_INFO_DATA],
124538f7b870SPatrick McHardy 						       ops->policy);
124638f7b870SPatrick McHardy 				if (err < 0)
124738f7b870SPatrick McHardy 					return err;
124838f7b870SPatrick McHardy 				data = attr;
124938f7b870SPatrick McHardy 			}
125038f7b870SPatrick McHardy 			if (ops->validate) {
125138f7b870SPatrick McHardy 				err = ops->validate(tb, data);
125238f7b870SPatrick McHardy 				if (err < 0)
125338f7b870SPatrick McHardy 					return err;
125438f7b870SPatrick McHardy 			}
125538f7b870SPatrick McHardy 		}
125638f7b870SPatrick McHardy 
125738f7b870SPatrick McHardy 		if (dev) {
125838f7b870SPatrick McHardy 			int modified = 0;
125938f7b870SPatrick McHardy 
126038f7b870SPatrick McHardy 			if (nlh->nlmsg_flags & NLM_F_EXCL)
126138f7b870SPatrick McHardy 				return -EEXIST;
126238f7b870SPatrick McHardy 			if (nlh->nlmsg_flags & NLM_F_REPLACE)
126338f7b870SPatrick McHardy 				return -EOPNOTSUPP;
126438f7b870SPatrick McHardy 
126538f7b870SPatrick McHardy 			if (linkinfo[IFLA_INFO_DATA]) {
126638f7b870SPatrick McHardy 				if (!ops || ops != dev->rtnl_link_ops ||
126738f7b870SPatrick McHardy 				    !ops->changelink)
126838f7b870SPatrick McHardy 					return -EOPNOTSUPP;
126938f7b870SPatrick McHardy 
127038f7b870SPatrick McHardy 				err = ops->changelink(dev, tb, data);
127138f7b870SPatrick McHardy 				if (err < 0)
127238f7b870SPatrick McHardy 					return err;
127338f7b870SPatrick McHardy 				modified = 1;
127438f7b870SPatrick McHardy 			}
127538f7b870SPatrick McHardy 
127638f7b870SPatrick McHardy 			return do_setlink(dev, ifm, tb, ifname, modified);
127738f7b870SPatrick McHardy 		}
127838f7b870SPatrick McHardy 
127938f7b870SPatrick McHardy 		if (!(nlh->nlmsg_flags & NLM_F_CREATE))
128038f7b870SPatrick McHardy 			return -ENODEV;
128138f7b870SPatrick McHardy 
12823729d502SPatrick McHardy 		if (ifm->ifi_index)
128338f7b870SPatrick McHardy 			return -EOPNOTSUPP;
12840e06877cSPatrick McHardy 		if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
128538f7b870SPatrick McHardy 			return -EOPNOTSUPP;
128638f7b870SPatrick McHardy 
128738f7b870SPatrick McHardy 		if (!ops) {
128895a5afcaSJohannes Berg #ifdef CONFIG_MODULES
128938f7b870SPatrick McHardy 			if (kind[0]) {
129038f7b870SPatrick McHardy 				__rtnl_unlock();
129138f7b870SPatrick McHardy 				request_module("rtnl-link-%s", kind);
129238f7b870SPatrick McHardy 				rtnl_lock();
129338f7b870SPatrick McHardy 				ops = rtnl_link_ops_get(kind);
129438f7b870SPatrick McHardy 				if (ops)
129538f7b870SPatrick McHardy 					goto replay;
129638f7b870SPatrick McHardy 			}
129738f7b870SPatrick McHardy #endif
129838f7b870SPatrick McHardy 			return -EOPNOTSUPP;
129938f7b870SPatrick McHardy 		}
130038f7b870SPatrick McHardy 
130138f7b870SPatrick McHardy 		if (!ifname[0])
130238f7b870SPatrick McHardy 			snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
130338f7b870SPatrick McHardy 
130481adee47SEric W. Biederman 		dest_net = rtnl_link_get_net(net, tb);
130581adee47SEric W. Biederman 		dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
130638f7b870SPatrick McHardy 
1307e7199288SPavel Emelianov 		if (IS_ERR(dev))
1308e7199288SPavel Emelianov 			err = PTR_ERR(dev);
1309e7199288SPavel Emelianov 		else if (ops->newlink)
131081adee47SEric W. Biederman 			err = ops->newlink(net, dev, tb, data);
13112d85cba2SPatrick McHardy 		else
13122d85cba2SPatrick McHardy 			err = register_netdevice(dev);
13133729d502SPatrick McHardy 		if (err < 0 && !IS_ERR(dev)) {
131438f7b870SPatrick McHardy 			free_netdev(dev);
13153729d502SPatrick McHardy 			goto out;
13163729d502SPatrick McHardy 		}
131781adee47SEric W. Biederman 
13183729d502SPatrick McHardy 		err = rtnl_configure_link(dev, ifm);
13193729d502SPatrick McHardy 		if (err < 0)
13203729d502SPatrick McHardy 			unregister_netdevice(dev);
13213729d502SPatrick McHardy out:
132281adee47SEric W. Biederman 		put_net(dest_net);
132338f7b870SPatrick McHardy 		return err;
132438f7b870SPatrick McHardy 	}
132538f7b870SPatrick McHardy }
132638f7b870SPatrick McHardy 
1327b60c5115SThomas Graf static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1328711e2c33SJean Tourrilhes {
13293b1e0a65SYOSHIFUJI Hideaki 	struct net *net = sock_net(skb->sk);
1330b60c5115SThomas Graf 	struct ifinfomsg *ifm;
1331a3d12891SEric Dumazet 	char ifname[IFNAMSIZ];
1332b60c5115SThomas Graf 	struct nlattr *tb[IFLA_MAX+1];
1333b60c5115SThomas Graf 	struct net_device *dev = NULL;
1334b60c5115SThomas Graf 	struct sk_buff *nskb;
1335339bf98fSThomas Graf 	int err;
1336711e2c33SJean Tourrilhes 
1337b60c5115SThomas Graf 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1338b60c5115SThomas Graf 	if (err < 0)
13399918f230SEric Sesterhenn 		return err;
1340b60c5115SThomas Graf 
1341a3d12891SEric Dumazet 	if (tb[IFLA_IFNAME])
1342a3d12891SEric Dumazet 		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1343a3d12891SEric Dumazet 
1344b60c5115SThomas Graf 	ifm = nlmsg_data(nlh);
1345a3d12891SEric Dumazet 	if (ifm->ifi_index > 0)
1346a3d12891SEric Dumazet 		dev = __dev_get_by_index(net, ifm->ifi_index);
1347a3d12891SEric Dumazet 	else if (tb[IFLA_IFNAME])
1348a3d12891SEric Dumazet 		dev = __dev_get_by_name(net, ifname);
1349a3d12891SEric Dumazet 	else
1350b60c5115SThomas Graf 		return -EINVAL;
1351b60c5115SThomas Graf 
1352a3d12891SEric Dumazet 	if (dev == NULL)
1353a3d12891SEric Dumazet 		return -ENODEV;
1354a3d12891SEric Dumazet 
135538f7b870SPatrick McHardy 	nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1356a3d12891SEric Dumazet 	if (nskb == NULL)
1357a3d12891SEric Dumazet 		return -ENOBUFS;
1358711e2c33SJean Tourrilhes 
1359575c3e2aSPatrick McHardy 	err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1360575c3e2aSPatrick McHardy 			       nlh->nlmsg_seq, 0, 0);
136126932566SPatrick McHardy 	if (err < 0) {
136226932566SPatrick McHardy 		/* -EMSGSIZE implies BUG in if_nlmsg_size */
136326932566SPatrick McHardy 		WARN_ON(err == -EMSGSIZE);
136426932566SPatrick McHardy 		kfree_skb(nskb);
1365a3d12891SEric Dumazet 	} else
136697c53cacSDenis V. Lunev 		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1367b60c5115SThomas Graf 
1368711e2c33SJean Tourrilhes 	return err;
1369711e2c33SJean Tourrilhes }
1370711e2c33SJean Tourrilhes 
137142bad1daSAdrian Bunk static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
13721da177e4SLinus Torvalds {
13731da177e4SLinus Torvalds 	int idx;
13741da177e4SLinus Torvalds 	int s_idx = cb->family;
13751da177e4SLinus Torvalds 
13761da177e4SLinus Torvalds 	if (s_idx == 0)
13771da177e4SLinus Torvalds 		s_idx = 1;
13781da177e4SLinus Torvalds 	for (idx = 1; idx < NPROTO; idx++) {
13791da177e4SLinus Torvalds 		int type = cb->nlh->nlmsg_type-RTM_BASE;
13801da177e4SLinus Torvalds 		if (idx < s_idx || idx == PF_PACKET)
13811da177e4SLinus Torvalds 			continue;
1382e2849863SThomas Graf 		if (rtnl_msg_handlers[idx] == NULL ||
1383e2849863SThomas Graf 		    rtnl_msg_handlers[idx][type].dumpit == NULL)
13841da177e4SLinus Torvalds 			continue;
13851da177e4SLinus Torvalds 		if (idx > s_idx)
13861da177e4SLinus Torvalds 			memset(&cb->args[0], 0, sizeof(cb->args));
1387e2849863SThomas Graf 		if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
13881da177e4SLinus Torvalds 			break;
13891da177e4SLinus Torvalds 	}
13901da177e4SLinus Torvalds 	cb->family = idx;
13911da177e4SLinus Torvalds 
13921da177e4SLinus Torvalds 	return skb->len;
13931da177e4SLinus Torvalds }
13941da177e4SLinus Torvalds 
13951da177e4SLinus Torvalds void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
13961da177e4SLinus Torvalds {
1397c346dca1SYOSHIFUJI Hideaki 	struct net *net = dev_net(dev);
13981da177e4SLinus Torvalds 	struct sk_buff *skb;
13990ec6d3f4SThomas Graf 	int err = -ENOBUFS;
14001da177e4SLinus Torvalds 
140138f7b870SPatrick McHardy 	skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
14020ec6d3f4SThomas Graf 	if (skb == NULL)
14030ec6d3f4SThomas Graf 		goto errout;
14041da177e4SLinus Torvalds 
1405575c3e2aSPatrick McHardy 	err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
140626932566SPatrick McHardy 	if (err < 0) {
140726932566SPatrick McHardy 		/* -EMSGSIZE implies BUG in if_nlmsg_size() */
140826932566SPatrick McHardy 		WARN_ON(err == -EMSGSIZE);
140926932566SPatrick McHardy 		kfree_skb(skb);
141026932566SPatrick McHardy 		goto errout;
141126932566SPatrick McHardy 	}
14121ce85fe4SPablo Neira Ayuso 	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
14131ce85fe4SPablo Neira Ayuso 	return;
14140ec6d3f4SThomas Graf errout:
14150ec6d3f4SThomas Graf 	if (err < 0)
14164b3da706SEric W. Biederman 		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
14171da177e4SLinus Torvalds }
14181da177e4SLinus Torvalds 
14191da177e4SLinus Torvalds /* Protected by RTNL sempahore.  */
14201da177e4SLinus Torvalds static struct rtattr **rta_buf;
14211da177e4SLinus Torvalds static int rtattr_max;
14221da177e4SLinus Torvalds 
14231da177e4SLinus Torvalds /* Process one rtnetlink message. */
14241da177e4SLinus Torvalds 
14251d00a4ebSThomas Graf static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
14261da177e4SLinus Torvalds {
14273b1e0a65SYOSHIFUJI Hideaki 	struct net *net = sock_net(skb->sk);
1428e2849863SThomas Graf 	rtnl_doit_func doit;
14291da177e4SLinus Torvalds 	int sz_idx, kind;
14301da177e4SLinus Torvalds 	int min_len;
14311da177e4SLinus Torvalds 	int family;
14321da177e4SLinus Torvalds 	int type;
14331c2d670fSPatrick McHardy 	int err;
14341da177e4SLinus Torvalds 
14351da177e4SLinus Torvalds 	type = nlh->nlmsg_type;
14361da177e4SLinus Torvalds 	if (type > RTM_MAX)
1437038890feSThomas Graf 		return -EOPNOTSUPP;
14381da177e4SLinus Torvalds 
14391da177e4SLinus Torvalds 	type -= RTM_BASE;
14401da177e4SLinus Torvalds 
14411da177e4SLinus Torvalds 	/* All the messages must have at least 1 byte length */
14421da177e4SLinus Torvalds 	if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
14431da177e4SLinus Torvalds 		return 0;
14441da177e4SLinus Torvalds 
14451da177e4SLinus Torvalds 	family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
14461d00a4ebSThomas Graf 	if (family >= NPROTO)
14471d00a4ebSThomas Graf 		return -EAFNOSUPPORT;
14481da177e4SLinus Torvalds 
14491da177e4SLinus Torvalds 	sz_idx = type>>2;
14501da177e4SLinus Torvalds 	kind = type&3;
14511da177e4SLinus Torvalds 
14521d00a4ebSThomas Graf 	if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
14531d00a4ebSThomas Graf 		return -EPERM;
14541da177e4SLinus Torvalds 
14551da177e4SLinus Torvalds 	if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
145697c53cacSDenis V. Lunev 		struct sock *rtnl;
1457e2849863SThomas Graf 		rtnl_dumpit_func dumpit;
14581da177e4SLinus Torvalds 
1459e2849863SThomas Graf 		dumpit = rtnl_get_dumpit(family, type);
1460e2849863SThomas Graf 		if (dumpit == NULL)
1461038890feSThomas Graf 			return -EOPNOTSUPP;
14621da177e4SLinus Torvalds 
14631c2d670fSPatrick McHardy 		__rtnl_unlock();
146497c53cacSDenis V. Lunev 		rtnl = net->rtnl;
14651c2d670fSPatrick McHardy 		err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
14661c2d670fSPatrick McHardy 		rtnl_lock();
14671c2d670fSPatrick McHardy 		return err;
14681da177e4SLinus Torvalds 	}
14691da177e4SLinus Torvalds 
14701da177e4SLinus Torvalds 	memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
14711da177e4SLinus Torvalds 
14721da177e4SLinus Torvalds 	min_len = rtm_min[sz_idx];
14731da177e4SLinus Torvalds 	if (nlh->nlmsg_len < min_len)
14741d00a4ebSThomas Graf 		return -EINVAL;
14751da177e4SLinus Torvalds 
14761da177e4SLinus Torvalds 	if (nlh->nlmsg_len > min_len) {
14771da177e4SLinus Torvalds 		int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
14781da177e4SLinus Torvalds 		struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
14791da177e4SLinus Torvalds 
14801da177e4SLinus Torvalds 		while (RTA_OK(attr, attrlen)) {
14811da177e4SLinus Torvalds 			unsigned flavor = attr->rta_type;
14821da177e4SLinus Torvalds 			if (flavor) {
14831da177e4SLinus Torvalds 				if (flavor > rta_max[sz_idx])
14841d00a4ebSThomas Graf 					return -EINVAL;
14851da177e4SLinus Torvalds 				rta_buf[flavor-1] = attr;
14861da177e4SLinus Torvalds 			}
14871da177e4SLinus Torvalds 			attr = RTA_NEXT(attr, attrlen);
14881da177e4SLinus Torvalds 		}
14891da177e4SLinus Torvalds 	}
14901da177e4SLinus Torvalds 
1491e2849863SThomas Graf 	doit = rtnl_get_doit(family, type);
1492e2849863SThomas Graf 	if (doit == NULL)
1493038890feSThomas Graf 		return -EOPNOTSUPP;
14941da177e4SLinus Torvalds 
14951d00a4ebSThomas Graf 	return doit(skb, nlh, (void *)&rta_buf[0]);
14961da177e4SLinus Torvalds }
14971da177e4SLinus Torvalds 
1498cd40b7d3SDenis V. Lunev static void rtnetlink_rcv(struct sk_buff *skb)
14991da177e4SLinus Torvalds {
15001536cc0dSDenis V. Lunev 	rtnl_lock();
1501cd40b7d3SDenis V. Lunev 	netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
15021536cc0dSDenis V. Lunev 	rtnl_unlock();
15031da177e4SLinus Torvalds }
15041da177e4SLinus Torvalds 
15051da177e4SLinus Torvalds static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
15061da177e4SLinus Torvalds {
15071da177e4SLinus Torvalds 	struct net_device *dev = ptr;
1508e9dc8653SEric W. Biederman 
15091da177e4SLinus Torvalds 	switch (event) {
15101da177e4SLinus Torvalds 	case NETDEV_UP:
15111da177e4SLinus Torvalds 	case NETDEV_DOWN:
151210de05afSPatrick McHardy 	case NETDEV_PRE_UP:
1513d90a909eSEric W. Biederman 	case NETDEV_POST_INIT:
1514d90a909eSEric W. Biederman 	case NETDEV_REGISTER:
15151da177e4SLinus Torvalds 	case NETDEV_CHANGE:
15161da177e4SLinus Torvalds 	case NETDEV_GOING_DOWN:
1517a2835763SPatrick McHardy 	case NETDEV_UNREGISTER:
1518d90a909eSEric W. Biederman 	case NETDEV_UNREGISTER_BATCH:
15191da177e4SLinus Torvalds 		break;
15201da177e4SLinus Torvalds 	default:
15211da177e4SLinus Torvalds 		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
15221da177e4SLinus Torvalds 		break;
15231da177e4SLinus Torvalds 	}
15241da177e4SLinus Torvalds 	return NOTIFY_DONE;
15251da177e4SLinus Torvalds }
15261da177e4SLinus Torvalds 
15271da177e4SLinus Torvalds static struct notifier_block rtnetlink_dev_notifier = {
15281da177e4SLinus Torvalds 	.notifier_call	= rtnetlink_event,
15291da177e4SLinus Torvalds };
15301da177e4SLinus Torvalds 
153197c53cacSDenis V. Lunev 
15322c8c1e72SAlexey Dobriyan static int __net_init rtnetlink_net_init(struct net *net)
153397c53cacSDenis V. Lunev {
153497c53cacSDenis V. Lunev 	struct sock *sk;
153597c53cacSDenis V. Lunev 	sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
153697c53cacSDenis V. Lunev 				   rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
153797c53cacSDenis V. Lunev 	if (!sk)
153897c53cacSDenis V. Lunev 		return -ENOMEM;
153997c53cacSDenis V. Lunev 	net->rtnl = sk;
154097c53cacSDenis V. Lunev 	return 0;
154197c53cacSDenis V. Lunev }
154297c53cacSDenis V. Lunev 
15432c8c1e72SAlexey Dobriyan static void __net_exit rtnetlink_net_exit(struct net *net)
154497c53cacSDenis V. Lunev {
1545b7c6ba6eSDenis V. Lunev 	netlink_kernel_release(net->rtnl);
154697c53cacSDenis V. Lunev 	net->rtnl = NULL;
154797c53cacSDenis V. Lunev }
154897c53cacSDenis V. Lunev 
154997c53cacSDenis V. Lunev static struct pernet_operations rtnetlink_net_ops = {
155097c53cacSDenis V. Lunev 	.init = rtnetlink_net_init,
155197c53cacSDenis V. Lunev 	.exit = rtnetlink_net_exit,
155297c53cacSDenis V. Lunev };
155397c53cacSDenis V. Lunev 
15541da177e4SLinus Torvalds void __init rtnetlink_init(void)
15551da177e4SLinus Torvalds {
15561da177e4SLinus Torvalds 	int i;
15571da177e4SLinus Torvalds 
15581da177e4SLinus Torvalds 	rtattr_max = 0;
15591da177e4SLinus Torvalds 	for (i = 0; i < ARRAY_SIZE(rta_max); i++)
15601da177e4SLinus Torvalds 		if (rta_max[i] > rtattr_max)
15611da177e4SLinus Torvalds 			rtattr_max = rta_max[i];
15621da177e4SLinus Torvalds 	rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
15631da177e4SLinus Torvalds 	if (!rta_buf)
15641da177e4SLinus Torvalds 		panic("rtnetlink_init: cannot allocate rta_buf\n");
15651da177e4SLinus Torvalds 
156697c53cacSDenis V. Lunev 	if (register_pernet_subsys(&rtnetlink_net_ops))
15671da177e4SLinus Torvalds 		panic("rtnetlink_init: cannot initialize rtnetlink\n");
156897c53cacSDenis V. Lunev 
15691da177e4SLinus Torvalds 	netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
15701da177e4SLinus Torvalds 	register_netdevice_notifier(&rtnetlink_dev_notifier);
1571340d17fcSThomas Graf 
1572340d17fcSThomas Graf 	rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1573340d17fcSThomas Graf 	rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
157438f7b870SPatrick McHardy 	rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
157538f7b870SPatrick McHardy 	rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1576687ad8ccSThomas Graf 
1577687ad8ccSThomas Graf 	rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1578687ad8ccSThomas Graf 	rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
15791da177e4SLinus Torvalds }
15801da177e4SLinus Torvalds 
1581