rtnetlink.c 36.6 KB
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/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Routing netlink socket interface: protocol independent part.
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *	Fixes:
 *	Vitaly E. Lavrov		RTA_OK arithmetics was wrong.
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/capability.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/security.h>
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#include <linux/mutex.h>
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#include <linux/if_addr.h>
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#include <linux/pci.h>
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#include <asm/uaccess.h>
#include <asm/system.h>

#include <linux/inet.h>
#include <linux/netdevice.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/arp.h>
#include <net/route.h>
#include <net/udp.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
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#include <net/fib_rules.h>
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#include <net/rtnetlink.h>
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#include <net/net_namespace.h>
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struct rtnl_link {
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	rtnl_doit_func		doit;
	rtnl_dumpit_func	dumpit;
};

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static DEFINE_MUTEX(rtnl_mutex);
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void rtnl_lock(void)
{
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	mutex_lock(&rtnl_mutex);
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}
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EXPORT_SYMBOL(rtnl_lock);
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void __rtnl_unlock(void)
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{
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	mutex_unlock(&rtnl_mutex);
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}
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void rtnl_unlock(void)
{
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	/* This fellow will unlock it for us. */
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	netdev_run_todo();
}
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EXPORT_SYMBOL(rtnl_unlock);
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int rtnl_trylock(void)
{
	return mutex_trylock(&rtnl_mutex);
}
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EXPORT_SYMBOL(rtnl_trylock);
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int rtnl_is_locked(void)
{
	return mutex_is_locked(&rtnl_mutex);
}
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EXPORT_SYMBOL(rtnl_is_locked);
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#ifdef CONFIG_PROVE_LOCKING
int lockdep_rtnl_is_held(void)
{
	return lockdep_is_held(&rtnl_mutex);
}
EXPORT_SYMBOL(lockdep_rtnl_is_held);
#endif /* #ifdef CONFIG_PROVE_LOCKING */

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static struct rtnl_link *rtnl_msg_handlers[NPROTO];
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static inline int rtm_msgindex(int msgtype)
{
	int msgindex = msgtype - RTM_BASE;

	/*
	 * msgindex < 0 implies someone tried to register a netlink
	 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
	 * the message type has not been added to linux/rtnetlink.h
	 */
	BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);

	return msgindex;
}

static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
{
	struct rtnl_link *tab;

	tab = rtnl_msg_handlers[protocol];
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	if (tab == NULL || tab[msgindex].doit == NULL)
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		tab = rtnl_msg_handlers[PF_UNSPEC];

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	return tab ? tab[msgindex].doit : NULL;
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}

static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
{
	struct rtnl_link *tab;

	tab = rtnl_msg_handlers[protocol];
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	if (tab == NULL || tab[msgindex].dumpit == NULL)
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		tab = rtnl_msg_handlers[PF_UNSPEC];

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	return tab ? tab[msgindex].dumpit : NULL;
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}

/**
 * __rtnl_register - Register a rtnetlink message type
 * @protocol: Protocol family or PF_UNSPEC
 * @msgtype: rtnetlink message type
 * @doit: Function pointer called for each request message
 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 *
 * Registers the specified function pointers (at least one of them has
 * to be non-NULL) to be called whenever a request message for the
 * specified protocol family and message type is received.
 *
 * The special protocol family PF_UNSPEC may be used to define fallback
 * function pointers for the case when no entry for the specific protocol
 * family exists.
 *
 * Returns 0 on success or a negative error code.
 */
int __rtnl_register(int protocol, int msgtype,
		    rtnl_doit_func doit, rtnl_dumpit_func dumpit)
{
	struct rtnl_link *tab;
	int msgindex;

	BUG_ON(protocol < 0 || protocol >= NPROTO);
	msgindex = rtm_msgindex(msgtype);

	tab = rtnl_msg_handlers[protocol];
	if (tab == NULL) {
		tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
		if (tab == NULL)
			return -ENOBUFS;

		rtnl_msg_handlers[protocol] = tab;
	}

	if (doit)
		tab[msgindex].doit = doit;

	if (dumpit)
		tab[msgindex].dumpit = dumpit;

	return 0;
}
EXPORT_SYMBOL_GPL(__rtnl_register);

/**
 * rtnl_register - Register a rtnetlink message type
 *
 * Identical to __rtnl_register() but panics on failure. This is useful
 * as failure of this function is very unlikely, it can only happen due
 * to lack of memory when allocating the chain to store all message
 * handlers for a protocol. Meant for use in init functions where lack
 * of memory implies no sense in continueing.
 */
void rtnl_register(int protocol, int msgtype,
		   rtnl_doit_func doit, rtnl_dumpit_func dumpit)
{
	if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
		panic("Unable to register rtnetlink message handler, "
		      "protocol = %d, message type = %d\n",
		      protocol, msgtype);
}
EXPORT_SYMBOL_GPL(rtnl_register);

/**
 * rtnl_unregister - Unregister a rtnetlink message type
 * @protocol: Protocol family or PF_UNSPEC
 * @msgtype: rtnetlink message type
 *
 * Returns 0 on success or a negative error code.
 */
int rtnl_unregister(int protocol, int msgtype)
{
	int msgindex;

	BUG_ON(protocol < 0 || protocol >= NPROTO);
	msgindex = rtm_msgindex(msgtype);

	if (rtnl_msg_handlers[protocol] == NULL)
		return -ENOENT;

	rtnl_msg_handlers[protocol][msgindex].doit = NULL;
	rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;

	return 0;
}
EXPORT_SYMBOL_GPL(rtnl_unregister);

/**
 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 * @protocol : Protocol family or PF_UNSPEC
 *
 * Identical to calling rtnl_unregster() for all registered message types
 * of a certain protocol family.
 */
void rtnl_unregister_all(int protocol)
{
	BUG_ON(protocol < 0 || protocol >= NPROTO);

	kfree(rtnl_msg_handlers[protocol]);
	rtnl_msg_handlers[protocol] = NULL;
}
EXPORT_SYMBOL_GPL(rtnl_unregister_all);
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static LIST_HEAD(link_ops);

/**
 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 * @ops: struct rtnl_link_ops * to register
 *
 * The caller must hold the rtnl_mutex. This function should be used
 * by drivers that create devices during module initialization. It
 * must be called before registering the devices.
 *
 * Returns 0 on success or a negative error code.
 */
int __rtnl_link_register(struct rtnl_link_ops *ops)
{
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	if (!ops->dellink)
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		ops->dellink = unregister_netdevice_queue;
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	list_add_tail(&ops->list, &link_ops);
	return 0;
}
EXPORT_SYMBOL_GPL(__rtnl_link_register);

/**
 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 * @ops: struct rtnl_link_ops * to register
 *
 * Returns 0 on success or a negative error code.
 */
int rtnl_link_register(struct rtnl_link_ops *ops)
{
	int err;

	rtnl_lock();
	err = __rtnl_link_register(ops);
	rtnl_unlock();
	return err;
}
EXPORT_SYMBOL_GPL(rtnl_link_register);

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static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
{
	struct net_device *dev;
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	LIST_HEAD(list_kill);

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	for_each_netdev(net, dev) {
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		if (dev->rtnl_link_ops == ops)
			ops->dellink(dev, &list_kill);
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	}
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	unregister_netdevice_many(&list_kill);
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}

void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
{
	rtnl_lock();
	__rtnl_kill_links(net, ops);
	rtnl_unlock();
}
EXPORT_SYMBOL_GPL(rtnl_kill_links);

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/**
 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 * @ops: struct rtnl_link_ops * to unregister
 *
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 * The caller must hold the rtnl_mutex.
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 */
void __rtnl_link_unregister(struct rtnl_link_ops *ops)
{
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	struct net *net;
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	for_each_net(net) {
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		__rtnl_kill_links(net, ops);
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	}
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	list_del(&ops->list);
}
EXPORT_SYMBOL_GPL(__rtnl_link_unregister);

/**
 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 * @ops: struct rtnl_link_ops * to unregister
 */
void rtnl_link_unregister(struct rtnl_link_ops *ops)
{
	rtnl_lock();
	__rtnl_link_unregister(ops);
	rtnl_unlock();
}
EXPORT_SYMBOL_GPL(rtnl_link_unregister);

static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
{
	const struct rtnl_link_ops *ops;

	list_for_each_entry(ops, &link_ops, list) {
		if (!strcmp(ops->kind, kind))
			return ops;
	}
	return NULL;
}

static size_t rtnl_link_get_size(const struct net_device *dev)
{
	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
	size_t size;

	if (!ops)
		return 0;

	size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
	       nlmsg_total_size(strlen(ops->kind) + 1);	 /* IFLA_INFO_KIND */

	if (ops->get_size)
		/* IFLA_INFO_DATA + nested data */
		size += nlmsg_total_size(sizeof(struct nlattr)) +
			ops->get_size(dev);

	if (ops->get_xstats_size)
		size += ops->get_xstats_size(dev);	/* IFLA_INFO_XSTATS */

	return size;
}

static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
{
	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
	struct nlattr *linkinfo, *data;
	int err = -EMSGSIZE;

	linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
	if (linkinfo == NULL)
		goto out;

	if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
		goto err_cancel_link;
	if (ops->fill_xstats) {
		err = ops->fill_xstats(skb, dev);
		if (err < 0)
			goto err_cancel_link;
	}
	if (ops->fill_info) {
		data = nla_nest_start(skb, IFLA_INFO_DATA);
		if (data == NULL)
			goto err_cancel_link;
		err = ops->fill_info(skb, dev);
		if (err < 0)
			goto err_cancel_data;
		nla_nest_end(skb, data);
	}

	nla_nest_end(skb, linkinfo);
	return 0;

err_cancel_data:
	nla_nest_cancel(skb, data);
err_cancel_link:
	nla_nest_cancel(skb, linkinfo);
out:
	return err;
}

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static const int rtm_min[RTM_NR_FAMILIES] =
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{
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	[RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
	[RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
	[RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
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	[RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
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	[RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
	[RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
	[RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
	[RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
	[RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
	[RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
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};

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static const int rta_max[RTM_NR_FAMILIES] =
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{
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	[RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
	[RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
	[RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
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	[RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
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	[RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
	[RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
	[RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
	[RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
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};

void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
{
	struct rtattr *rta;
	int size = RTA_LENGTH(attrlen);

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	rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
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	rta->rta_type = attrtype;
	rta->rta_len = size;
	memcpy(RTA_DATA(rta), data, attrlen);
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	memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
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}
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EXPORT_SYMBOL(__rta_fill);
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int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
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{
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	struct sock *rtnl = net->rtnl;
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	int err = 0;

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	NETLINK_CB(skb).dst_group = group;
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	if (echo)
		atomic_inc(&skb->users);
	netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
	if (echo)
		err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
	return err;
}

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int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
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{
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	struct sock *rtnl = net->rtnl;

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	return nlmsg_unicast(rtnl, skb, pid);
}
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EXPORT_SYMBOL(rtnl_unicast);
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void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
		 struct nlmsghdr *nlh, gfp_t flags)
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{
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	struct sock *rtnl = net->rtnl;
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	int report = 0;

	if (nlh)
		report = nlmsg_report(nlh);

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	nlmsg_notify(rtnl, skb, pid, group, report, flags);
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}
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EXPORT_SYMBOL(rtnl_notify);
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void rtnl_set_sk_err(struct net *net, u32 group, int error)
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{
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	struct sock *rtnl = net->rtnl;

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	netlink_set_err(rtnl, 0, group, error);
}
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EXPORT_SYMBOL(rtnl_set_sk_err);
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int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
{
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	struct nlattr *mx;
	int i, valid = 0;

	mx = nla_nest_start(skb, RTA_METRICS);
	if (mx == NULL)
		return -ENOBUFS;

	for (i = 0; i < RTAX_MAX; i++) {
		if (metrics[i]) {
			valid++;
			NLA_PUT_U32(skb, i+1, metrics[i]);
		}
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	}

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	if (!valid) {
		nla_nest_cancel(skb, mx);
		return 0;
	}
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	return nla_nest_end(skb, mx);

nla_put_failure:
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	nla_nest_cancel(skb, mx);
	return -EMSGSIZE;
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}
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EXPORT_SYMBOL(rtnetlink_put_metrics);
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int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
		       u32 ts, u32 tsage, long expires, u32 error)
{
	struct rta_cacheinfo ci = {
		.rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
		.rta_used = dst->__use,
		.rta_clntref = atomic_read(&(dst->__refcnt)),
		.rta_error = error,
		.rta_id =  id,
		.rta_ts = ts,
		.rta_tsage = tsage,
	};

	if (expires)
		ci.rta_expires = jiffies_to_clock_t(expires);

	return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
}
EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
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static void set_operstate(struct net_device *dev, unsigned char transition)
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{
	unsigned char operstate = dev->operstate;

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	switch (transition) {
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	case IF_OPER_UP:
		if ((operstate == IF_OPER_DORMANT ||
		     operstate == IF_OPER_UNKNOWN) &&
		    !netif_dormant(dev))
			operstate = IF_OPER_UP;
		break;

	case IF_OPER_DORMANT:
		if (operstate == IF_OPER_UP ||
		    operstate == IF_OPER_UNKNOWN)
			operstate = IF_OPER_DORMANT;
		break;
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	}
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	if (dev->operstate != operstate) {
		write_lock_bh(&dev_base_lock);
		dev->operstate = operstate;
		write_unlock_bh(&dev_base_lock);
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		netdev_state_change(dev);
	}
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}

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static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
					   const struct ifinfomsg *ifm)
{
	unsigned int flags = ifm->ifi_flags;

	/* bugwards compatibility: ifi_change == 0 is treated as ~0 */
	if (ifm->ifi_change)
		flags = (flags & ifm->ifi_change) |
			(dev->flags & ~ifm->ifi_change);

	return flags;
}

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static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
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				 const struct net_device_stats *b)
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{
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	a->rx_packets = b->rx_packets;
	a->tx_packets = b->tx_packets;
	a->rx_bytes = b->rx_bytes;
	a->tx_bytes = b->tx_bytes;
	a->rx_errors = b->rx_errors;
	a->tx_errors = b->tx_errors;
	a->rx_dropped = b->rx_dropped;
	a->tx_dropped = b->tx_dropped;

	a->multicast = b->multicast;
	a->collisions = b->collisions;

	a->rx_length_errors = b->rx_length_errors;
	a->rx_over_errors = b->rx_over_errors;
	a->rx_crc_errors = b->rx_crc_errors;
	a->rx_frame_errors = b->rx_frame_errors;
	a->rx_fifo_errors = b->rx_fifo_errors;
	a->rx_missed_errors = b->rx_missed_errors;

	a->tx_aborted_errors = b->tx_aborted_errors;
	a->tx_carrier_errors = b->tx_carrier_errors;
	a->tx_fifo_errors = b->tx_fifo_errors;
	a->tx_heartbeat_errors = b->tx_heartbeat_errors;
	a->tx_window_errors = b->tx_window_errors;

	a->rx_compressed = b->rx_compressed;
	a->tx_compressed = b->tx_compressed;
};
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static inline int rtnl_vfinfo_size(const struct net_device *dev)
{
	if (dev->dev.parent && dev_is_pci(dev->dev.parent))
		return dev_num_vf(dev->dev.parent) *
			sizeof(struct ifla_vf_info);
	else
		return 0;
}

P
Patrick McHardy 已提交
614
static inline size_t if_nlmsg_size(const struct net_device *dev)
615 616 617
{
	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
618
	       + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
619 620 621 622 623 624 625 626 627 628 629
	       + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
	       + nla_total_size(sizeof(struct rtnl_link_ifmap))
	       + nla_total_size(sizeof(struct rtnl_link_stats))
	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
	       + nla_total_size(4) /* IFLA_TXQLEN */
	       + nla_total_size(4) /* IFLA_WEIGHT */
	       + nla_total_size(4) /* IFLA_MTU */
	       + nla_total_size(4) /* IFLA_LINK */
	       + nla_total_size(4) /* IFLA_MASTER */
	       + nla_total_size(1) /* IFLA_OPERSTATE */
P
Patrick McHardy 已提交
630
	       + nla_total_size(1) /* IFLA_LINKMODE */
631 632
	       + nla_total_size(4) /* IFLA_NUM_VF */
	       + nla_total_size(rtnl_vfinfo_size(dev)) /* IFLA_VFINFO */
P
Patrick McHardy 已提交
633
	       + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
634 635
}

636
static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
637 638
			    int type, u32 pid, u32 seq, u32 change,
			    unsigned int flags)
639 640 641
{
	struct ifinfomsg *ifm;
	struct nlmsghdr *nlh;
642
	const struct net_device_stats *stats;
643
	struct nlattr *attr;
L
Linus Torvalds 已提交
644

645 646
	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
	if (nlh == NULL)
647
		return -EMSGSIZE;
L
Linus Torvalds 已提交
648

649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668
	ifm = nlmsg_data(nlh);
	ifm->ifi_family = AF_UNSPEC;
	ifm->__ifi_pad = 0;
	ifm->ifi_type = dev->type;
	ifm->ifi_index = dev->ifindex;
	ifm->ifi_flags = dev_get_flags(dev);
	ifm->ifi_change = change;

	NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
	NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
	NLA_PUT_U8(skb, IFLA_OPERSTATE,
		   netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
	NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
	NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);

	if (dev->ifindex != dev->iflink)
		NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);

	if (dev->master)
		NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
L
Linus Torvalds 已提交
669

670 671
	if (dev->qdisc)
		NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
S
Stefan Rompf 已提交
672

673 674 675
	if (dev->ifalias)
		NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);

L
Linus Torvalds 已提交
676 677 678 679 680 681 682 683 684
	if (1) {
		struct rtnl_link_ifmap map = {
			.mem_start   = dev->mem_start,
			.mem_end     = dev->mem_end,
			.base_addr   = dev->base_addr,
			.irq         = dev->irq,
			.dma         = dev->dma,
			.port        = dev->if_port,
		};
685
		NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
L
Linus Torvalds 已提交
686 687 688
	}

	if (dev->addr_len) {
689 690
		NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
		NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
L
Linus Torvalds 已提交
691 692
	}

693 694 695 696
	attr = nla_reserve(skb, IFLA_STATS,
			sizeof(struct rtnl_link_stats));
	if (attr == NULL)
		goto nla_put_failure;
697

698
	stats = dev_get_stats(dev);
699
	copy_rtnl_link_stats(nla_data(attr), stats);
L
Linus Torvalds 已提交
700

701 702 703 704 705 706 707 708 709 710 711
	if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
		int i;
		struct ifla_vf_info ivi;

		NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
		for (i = 0; i < dev_num_vf(dev->dev.parent); i++) {
			if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
				break;
			NLA_PUT(skb, IFLA_VFINFO, sizeof(ivi), &ivi);
		}
	}
P
Patrick McHardy 已提交
712 713 714 715 716
	if (dev->rtnl_link_ops) {
		if (rtnl_link_fill(skb, dev) < 0)
			goto nla_put_failure;
	}

717 718 719
	return nlmsg_end(skb, nlh);

nla_put_failure:
720 721
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
L
Linus Torvalds 已提交
722 723
}

724
static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
L
Linus Torvalds 已提交
725
{
726
	struct net *net = sock_net(skb->sk);
727 728
	int h, s_h;
	int idx = 0, s_idx;
L
Linus Torvalds 已提交
729
	struct net_device *dev;
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746
	struct hlist_head *head;
	struct hlist_node *node;

	s_h = cb->args[0];
	s_idx = cb->args[1];

	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
		idx = 0;
		head = &net->dev_index_head[h];
		hlist_for_each_entry(dev, node, head, index_hlist) {
			if (idx < s_idx)
				goto cont;
			if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
					     NETLINK_CB(cb->skb).pid,
					     cb->nlh->nlmsg_seq, 0,
					     NLM_F_MULTI) <= 0)
				goto out;
747
cont:
748 749
			idx++;
		}
L
Linus Torvalds 已提交
750
	}
751 752 753
out:
	cb->args[1] = idx;
	cb->args[0] = h;
L
Linus Torvalds 已提交
754 755 756 757

	return skb->len;
}

758
const struct nla_policy ifla_policy[IFLA_MAX+1] = {
759
	[IFLA_IFNAME]		= { .type = NLA_STRING, .len = IFNAMSIZ-1 },
P
Patrick McHardy 已提交
760 761
	[IFLA_ADDRESS]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
	[IFLA_BROADCAST]	= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
762
	[IFLA_MAP]		= { .len = sizeof(struct rtnl_link_ifmap) },
763
	[IFLA_MTU]		= { .type = NLA_U32 },
764
	[IFLA_LINK]		= { .type = NLA_U32 },
765 766 767 768
	[IFLA_TXQLEN]		= { .type = NLA_U32 },
	[IFLA_WEIGHT]		= { .type = NLA_U32 },
	[IFLA_OPERSTATE]	= { .type = NLA_U8 },
	[IFLA_LINKMODE]		= { .type = NLA_U8 },
769
	[IFLA_LINKINFO]		= { .type = NLA_NESTED },
770
	[IFLA_NET_NS_PID]	= { .type = NLA_U32 },
771
	[IFLA_IFALIAS]	        = { .type = NLA_STRING, .len = IFALIASZ-1 },
772 773 774 775 776 777
	[IFLA_VF_MAC]		= { .type = NLA_BINARY,
				    .len = sizeof(struct ifla_vf_mac) },
	[IFLA_VF_VLAN]		= { .type = NLA_BINARY,
				    .len = sizeof(struct ifla_vf_vlan) },
	[IFLA_VF_TX_RATE]	= { .type = NLA_BINARY,
				    .len = sizeof(struct ifla_vf_tx_rate) },
778
};
E
Eric Dumazet 已提交
779
EXPORT_SYMBOL(ifla_policy);
780

P
Patrick McHardy 已提交
781 782 783 784 785
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
	[IFLA_INFO_KIND]	= { .type = NLA_STRING },
	[IFLA_INFO_DATA]	= { .type = NLA_NESTED },
};

786 787 788 789 790 791 792 793 794 795 796 797 798 799
struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
{
	struct net *net;
	/* Examine the link attributes and figure out which
	 * network namespace we are talking about.
	 */
	if (tb[IFLA_NET_NS_PID])
		net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
	else
		net = get_net(src_net);
	return net;
}
EXPORT_SYMBOL(rtnl_link_get_net);

800 801 802 803 804 805 806 807 808 809 810 811 812 813 814
static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
{
	if (dev) {
		if (tb[IFLA_ADDRESS] &&
		    nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
			return -EINVAL;

		if (tb[IFLA_BROADCAST] &&
		    nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
			return -EINVAL;
	}

	return 0;
}

815
static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
P
Patrick McHardy 已提交
816
		      struct nlattr **tb, char *ifname, int modified)
L
Linus Torvalds 已提交
817
{
818
	const struct net_device_ops *ops = dev->netdev_ops;
P
Patrick McHardy 已提交
819
	int send_addr_notify = 0;
820
	int err;
L
Linus Torvalds 已提交
821

822
	if (tb[IFLA_NET_NS_PID]) {
823
		struct net *net = rtnl_link_get_net(dev_net(dev), tb);
824 825 826 827 828 829 830 831 832 833 834
		if (IS_ERR(net)) {
			err = PTR_ERR(net);
			goto errout;
		}
		err = dev_change_net_namespace(dev, net, ifname);
		put_net(net);
		if (err)
			goto errout;
		modified = 1;
	}

835
	if (tb[IFLA_MAP]) {
L
Linus Torvalds 已提交
836 837 838
		struct rtnl_link_ifmap *u_map;
		struct ifmap k_map;

839
		if (!ops->ndo_set_config) {
L
Linus Torvalds 已提交
840
			err = -EOPNOTSUPP;
841
			goto errout;
L
Linus Torvalds 已提交
842 843 844 845
		}

		if (!netif_device_present(dev)) {
			err = -ENODEV;
846
			goto errout;
L
Linus Torvalds 已提交
847 848
		}

849
		u_map = nla_data(tb[IFLA_MAP]);
L
Linus Torvalds 已提交
850 851 852 853 854 855 856
		k_map.mem_start = (unsigned long) u_map->mem_start;
		k_map.mem_end = (unsigned long) u_map->mem_end;
		k_map.base_addr = (unsigned short) u_map->base_addr;
		k_map.irq = (unsigned char) u_map->irq;
		k_map.dma = (unsigned char) u_map->dma;
		k_map.port = (unsigned char) u_map->port;

857
		err = ops->ndo_set_config(dev, &k_map);
858
		if (err < 0)
859
			goto errout;
L
Linus Torvalds 已提交
860

861
		modified = 1;
L
Linus Torvalds 已提交
862 863
	}

864
	if (tb[IFLA_ADDRESS]) {
865 866 867
		struct sockaddr *sa;
		int len;

868
		if (!ops->ndo_set_mac_address) {
L
Linus Torvalds 已提交
869
			err = -EOPNOTSUPP;
870
			goto errout;
L
Linus Torvalds 已提交
871
		}
872

L
Linus Torvalds 已提交
873 874
		if (!netif_device_present(dev)) {
			err = -ENODEV;
875
			goto errout;
L
Linus Torvalds 已提交
876 877
		}

878 879 880 881
		len = sizeof(sa_family_t) + dev->addr_len;
		sa = kmalloc(len, GFP_KERNEL);
		if (!sa) {
			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);
887
		err = ops->ndo_set_mac_address(dev, sa);
888
		kfree(sa);
L
Linus Torvalds 已提交
889
		if (err)
890
			goto errout;
L
Linus Torvalds 已提交
891
		send_addr_notify = 1;
892
		modified = 1;
L
Linus Torvalds 已提交
893 894
	}

895 896 897
	if (tb[IFLA_MTU]) {
		err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
		if (err < 0)
898
			goto errout;
899
		modified = 1;
L
Linus Torvalds 已提交
900 901
	}

902 903 904 905 906
	/*
	 * Interface selected by interface index but interface
	 * name provided implies that a name change has been
	 * requested.
	 */
907
	if (ifm->ifi_index > 0 && ifname[0]) {
908 909
		err = dev_change_name(dev, ifname);
		if (err < 0)
910
			goto errout;
911
		modified = 1;
L
Linus Torvalds 已提交
912 913
	}

914 915 916 917 918 919 920 921
	if (tb[IFLA_IFALIAS]) {
		err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
				    nla_len(tb[IFLA_IFALIAS]));
		if (err < 0)
			goto errout;
		modified = 1;
	}

922 923 924
	if (tb[IFLA_BROADCAST]) {
		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
		send_addr_notify = 1;
L
Linus Torvalds 已提交
925 926
	}

927
	if (ifm->ifi_flags || ifm->ifi_change) {
928
		err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
929 930
		if (err < 0)
			goto errout;
931
	}
L
Linus Torvalds 已提交
932

933 934
	if (tb[IFLA_TXQLEN])
		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
S
Stefan Rompf 已提交
935

936
	if (tb[IFLA_OPERSTATE])
937
		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
S
Stefan Rompf 已提交
938

939
	if (tb[IFLA_LINKMODE]) {
940 941 942
		write_lock_bh(&dev_base_lock);
		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
		write_unlock_bh(&dev_base_lock);
S
Stefan Rompf 已提交
943 944
	}

945 946 947
	if (tb[IFLA_VF_MAC]) {
		struct ifla_vf_mac *ivm;
		ivm = nla_data(tb[IFLA_VF_MAC]);
948
		err = -EOPNOTSUPP;
949 950 951 952 953 954 955 956 957 958
		if (ops->ndo_set_vf_mac)
			err = ops->ndo_set_vf_mac(dev, ivm->vf, ivm->mac);
		if (err < 0)
			goto errout;
		modified = 1;
	}

	if (tb[IFLA_VF_VLAN]) {
		struct ifla_vf_vlan *ivv;
		ivv = nla_data(tb[IFLA_VF_VLAN]);
959
		err = -EOPNOTSUPP;
960 961
		if (ops->ndo_set_vf_vlan)
			err = ops->ndo_set_vf_vlan(dev, ivv->vf,
962 963
						   ivv->vlan,
						   ivv->qos);
964 965 966 967 968 969 970 971 972
		if (err < 0)
			goto errout;
		modified = 1;
	}
	err = 0;

	if (tb[IFLA_VF_TX_RATE]) {
		struct ifla_vf_tx_rate *ivt;
		ivt = nla_data(tb[IFLA_VF_TX_RATE]);
973
		err = -EOPNOTSUPP;
974 975 976 977 978 979
		if (ops->ndo_set_vf_tx_rate)
			err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, ivt->rate);
		if (err < 0)
			goto errout;
		modified = 1;
	}
L
Linus Torvalds 已提交
980 981
	err = 0;

982
errout:
983 984 985 986 987 988
	if (err < 0 && modified && net_ratelimit())
		printk(KERN_WARNING "A link change request failed with "
		       "some changes comitted already. Interface %s may "
		       "have been left with an inconsistent configuration, "
		       "please check.\n", dev->name);

L
Linus Torvalds 已提交
989 990
	if (send_addr_notify)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
991 992
	return err;
}
L
Linus Torvalds 已提交
993

994 995
static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
996
	struct net *net = sock_net(skb->sk);
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
	struct ifinfomsg *ifm;
	struct net_device *dev;
	int err;
	struct nlattr *tb[IFLA_MAX+1];
	char ifname[IFNAMSIZ];

	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
	if (err < 0)
		goto errout;

	if (tb[IFLA_IFNAME])
		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
	else
		ifname[0] = '\0';

	err = -EINVAL;
	ifm = nlmsg_data(nlh);
	if (ifm->ifi_index > 0)
1015
		dev = __dev_get_by_index(net, ifm->ifi_index);
1016
	else if (tb[IFLA_IFNAME])
1017
		dev = __dev_get_by_name(net, ifname);
1018 1019 1020 1021 1022 1023 1024 1025
	else
		goto errout;

	if (dev == NULL) {
		err = -ENODEV;
		goto errout;
	}

E
Eric Dumazet 已提交
1026 1027
	err = validate_linkmsg(dev, tb);
	if (err < 0)
1028
		goto errout;
1029

P
Patrick McHardy 已提交
1030
	err = do_setlink(dev, ifm, tb, ifname, 0);
1031
errout:
L
Linus Torvalds 已提交
1032 1033 1034
	return err;
}

P
Patrick McHardy 已提交
1035 1036
static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
1037
	struct net *net = sock_net(skb->sk);
P
Patrick McHardy 已提交
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
	const struct rtnl_link_ops *ops;
	struct net_device *dev;
	struct ifinfomsg *ifm;
	char ifname[IFNAMSIZ];
	struct nlattr *tb[IFLA_MAX+1];
	int err;

	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
	if (err < 0)
		return err;

	if (tb[IFLA_IFNAME])
		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);

	ifm = nlmsg_data(nlh);
	if (ifm->ifi_index > 0)
1054
		dev = __dev_get_by_index(net, ifm->ifi_index);
P
Patrick McHardy 已提交
1055
	else if (tb[IFLA_IFNAME])
1056
		dev = __dev_get_by_name(net, ifname);
P
Patrick McHardy 已提交
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
	else
		return -EINVAL;

	if (!dev)
		return -ENODEV;

	ops = dev->rtnl_link_ops;
	if (!ops)
		return -EOPNOTSUPP;

1067
	ops->dellink(dev, NULL);
P
Patrick McHardy 已提交
1068 1069 1070
	return 0;
}

1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
{
	unsigned int old_flags;
	int err;

	old_flags = dev->flags;
	if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
		err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
		if (err < 0)
			return err;
	}

	dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
	rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);

	__dev_notify_flags(dev, old_flags);
	return 0;
}
EXPORT_SYMBOL(rtnl_configure_link);

1091 1092
struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
	char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1093 1094 1095
{
	int err;
	struct net_device *dev;
E
Eric Dumazet 已提交
1096 1097
	unsigned int num_queues = 1;
	unsigned int real_num_queues = 1;
1098

E
Eric Dumazet 已提交
1099
	if (ops->get_tx_queues) {
1100
		err = ops->get_tx_queues(src_net, tb, &num_queues,
E
Eric Dumazet 已提交
1101
					 &real_num_queues);
E
Eric Dumazet 已提交
1102 1103 1104
		if (err)
			goto err;
	}
1105
	err = -ENOMEM;
E
Eric Dumazet 已提交
1106
	dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1107 1108 1109
	if (!dev)
		goto err;

1110 1111
	dev_net_set(dev, net);
	dev->rtnl_link_ops = ops;
1112
	dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
E
Eric Dumazet 已提交
1113
	dev->real_num_tx_queues = real_num_queues;
1114

1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
	if (strchr(dev->name, '%')) {
		err = dev_alloc_name(dev, dev->name);
		if (err < 0)
			goto err_free;
	}

	if (tb[IFLA_MTU])
		dev->mtu = nla_get_u32(tb[IFLA_MTU]);
	if (tb[IFLA_ADDRESS])
		memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
				nla_len(tb[IFLA_ADDRESS]));
	if (tb[IFLA_BROADCAST])
		memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
				nla_len(tb[IFLA_BROADCAST]));
	if (tb[IFLA_TXQLEN])
		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
	if (tb[IFLA_OPERSTATE])
1132
		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
	if (tb[IFLA_LINKMODE])
		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);

	return dev;

err_free:
	free_netdev(dev);
err:
	return ERR_PTR(err);
}
E
Eric Dumazet 已提交
1143
EXPORT_SYMBOL(rtnl_create_link);
1144

P
Patrick McHardy 已提交
1145 1146
static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
1147
	struct net *net = sock_net(skb->sk);
P
Patrick McHardy 已提交
1148 1149 1150 1151 1152 1153 1154 1155 1156
	const struct rtnl_link_ops *ops;
	struct net_device *dev;
	struct ifinfomsg *ifm;
	char kind[MODULE_NAME_LEN];
	char ifname[IFNAMSIZ];
	struct nlattr *tb[IFLA_MAX+1];
	struct nlattr *linkinfo[IFLA_INFO_MAX+1];
	int err;

1157
#ifdef CONFIG_MODULES
P
Patrick McHardy 已提交
1158
replay:
1159
#endif
P
Patrick McHardy 已提交
1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
	if (err < 0)
		return err;

	if (tb[IFLA_IFNAME])
		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
	else
		ifname[0] = '\0';

	ifm = nlmsg_data(nlh);
	if (ifm->ifi_index > 0)
1171
		dev = __dev_get_by_index(net, ifm->ifi_index);
P
Patrick McHardy 已提交
1172
	else if (ifname[0])
1173
		dev = __dev_get_by_name(net, ifname);
P
Patrick McHardy 已提交
1174 1175 1176
	else
		dev = NULL;

E
Eric Dumazet 已提交
1177 1178
	err = validate_linkmsg(dev, tb);
	if (err < 0)
1179 1180
		return err;

P
Patrick McHardy 已提交
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
	if (tb[IFLA_LINKINFO]) {
		err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
				       tb[IFLA_LINKINFO], ifla_info_policy);
		if (err < 0)
			return err;
	} else
		memset(linkinfo, 0, sizeof(linkinfo));

	if (linkinfo[IFLA_INFO_KIND]) {
		nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
		ops = rtnl_link_ops_get(kind);
	} else {
		kind[0] = '\0';
		ops = NULL;
	}

	if (1) {
		struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1199
		struct net *dest_net;
P
Patrick McHardy 已提交
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241

		if (ops) {
			if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
				err = nla_parse_nested(attr, ops->maxtype,
						       linkinfo[IFLA_INFO_DATA],
						       ops->policy);
				if (err < 0)
					return err;
				data = attr;
			}
			if (ops->validate) {
				err = ops->validate(tb, data);
				if (err < 0)
					return err;
			}
		}

		if (dev) {
			int modified = 0;

			if (nlh->nlmsg_flags & NLM_F_EXCL)
				return -EEXIST;
			if (nlh->nlmsg_flags & NLM_F_REPLACE)
				return -EOPNOTSUPP;

			if (linkinfo[IFLA_INFO_DATA]) {
				if (!ops || ops != dev->rtnl_link_ops ||
				    !ops->changelink)
					return -EOPNOTSUPP;

				err = ops->changelink(dev, tb, data);
				if (err < 0)
					return err;
				modified = 1;
			}

			return do_setlink(dev, ifm, tb, ifname, modified);
		}

		if (!(nlh->nlmsg_flags & NLM_F_CREATE))
			return -ENODEV;

1242
		if (ifm->ifi_index)
P
Patrick McHardy 已提交
1243
			return -EOPNOTSUPP;
1244
		if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
P
Patrick McHardy 已提交
1245 1246 1247
			return -EOPNOTSUPP;

		if (!ops) {
1248
#ifdef CONFIG_MODULES
P
Patrick McHardy 已提交
1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262
			if (kind[0]) {
				__rtnl_unlock();
				request_module("rtnl-link-%s", kind);
				rtnl_lock();
				ops = rtnl_link_ops_get(kind);
				if (ops)
					goto replay;
			}
#endif
			return -EOPNOTSUPP;
		}

		if (!ifname[0])
			snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1263

1264 1265
		dest_net = rtnl_link_get_net(net, tb);
		dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1266 1267 1268 1269

		if (IS_ERR(dev))
			err = PTR_ERR(dev);
		else if (ops->newlink)
1270
			err = ops->newlink(net, dev, tb, data);
1271 1272
		else
			err = register_netdevice(dev);
1273
		if (err < 0 && !IS_ERR(dev)) {
P
Patrick McHardy 已提交
1274
			free_netdev(dev);
1275 1276
			goto out;
		}
1277

1278 1279 1280 1281
		err = rtnl_configure_link(dev, ifm);
		if (err < 0)
			unregister_netdevice(dev);
out:
1282
		put_net(dest_net);
P
Patrick McHardy 已提交
1283 1284 1285 1286
		return err;
	}
}

1287
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1288
{
1289
	struct net *net = sock_net(skb->sk);
1290
	struct ifinfomsg *ifm;
1291
	char ifname[IFNAMSIZ];
1292 1293 1294
	struct nlattr *tb[IFLA_MAX+1];
	struct net_device *dev = NULL;
	struct sk_buff *nskb;
1295
	int err;
1296

1297 1298
	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
	if (err < 0)
1299
		return err;
1300

1301 1302 1303
	if (tb[IFLA_IFNAME])
		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);

1304
	ifm = nlmsg_data(nlh);
1305 1306 1307 1308 1309
	if (ifm->ifi_index > 0)
		dev = __dev_get_by_index(net, ifm->ifi_index);
	else if (tb[IFLA_IFNAME])
		dev = __dev_get_by_name(net, ifname);
	else
1310 1311
		return -EINVAL;

1312 1313 1314
	if (dev == NULL)
		return -ENODEV;

P
Patrick McHardy 已提交
1315
	nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1316 1317
	if (nskb == NULL)
		return -ENOBUFS;
1318

1319 1320
	err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
			       nlh->nlmsg_seq, 0, 0);
1321 1322 1323 1324
	if (err < 0) {
		/* -EMSGSIZE implies BUG in if_nlmsg_size */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(nskb);
1325 1326
	} else
		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1327

1328
	return err;
1329 1330
}

A
Adrian Bunk 已提交
1331
static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
L
Linus Torvalds 已提交
1332 1333 1334 1335 1336 1337
{
	int idx;
	int s_idx = cb->family;

	if (s_idx == 0)
		s_idx = 1;
E
Eric Dumazet 已提交
1338
	for (idx = 1; idx < NPROTO; idx++) {
L
Linus Torvalds 已提交
1339 1340 1341
		int type = cb->nlh->nlmsg_type-RTM_BASE;
		if (idx < s_idx || idx == PF_PACKET)
			continue;
1342 1343
		if (rtnl_msg_handlers[idx] == NULL ||
		    rtnl_msg_handlers[idx][type].dumpit == NULL)
L
Linus Torvalds 已提交
1344 1345 1346
			continue;
		if (idx > s_idx)
			memset(&cb->args[0], 0, sizeof(cb->args));
1347
		if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
L
Linus Torvalds 已提交
1348 1349 1350 1351 1352 1353 1354 1355 1356
			break;
	}
	cb->family = idx;

	return skb->len;
}

void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
{
1357
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
1358
	struct sk_buff *skb;
1359
	int err = -ENOBUFS;
L
Linus Torvalds 已提交
1360

P
Patrick McHardy 已提交
1361
	skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1362 1363
	if (skb == NULL)
		goto errout;
L
Linus Torvalds 已提交
1364

1365
	err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1366 1367 1368 1369 1370 1371
	if (err < 0) {
		/* -EMSGSIZE implies BUG in if_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
1372 1373
	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
	return;
1374 1375
errout:
	if (err < 0)
1376
		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
L
Linus Torvalds 已提交
1377 1378 1379 1380 1381 1382 1383 1384
}

/* Protected by RTNL sempahore.  */
static struct rtattr **rta_buf;
static int rtattr_max;

/* Process one rtnetlink message. */

1385
static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
L
Linus Torvalds 已提交
1386
{
1387
	struct net *net = sock_net(skb->sk);
1388
	rtnl_doit_func doit;
L
Linus Torvalds 已提交
1389 1390 1391 1392
	int sz_idx, kind;
	int min_len;
	int family;
	int type;
1393
	int err;
L
Linus Torvalds 已提交
1394 1395 1396

	type = nlh->nlmsg_type;
	if (type > RTM_MAX)
1397
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
1398 1399 1400 1401 1402 1403 1404

	type -= RTM_BASE;

	/* All the messages must have at least 1 byte length */
	if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
		return 0;

E
Eric Dumazet 已提交
1405
	family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1406 1407
	if (family >= NPROTO)
		return -EAFNOSUPPORT;
L
Linus Torvalds 已提交
1408 1409 1410 1411

	sz_idx = type>>2;
	kind = type&3;

1412 1413
	if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
		return -EPERM;
L
Linus Torvalds 已提交
1414 1415

	if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1416
		struct sock *rtnl;
1417
		rtnl_dumpit_func dumpit;
L
Linus Torvalds 已提交
1418

1419 1420
		dumpit = rtnl_get_dumpit(family, type);
		if (dumpit == NULL)
1421
			return -EOPNOTSUPP;
1422

1423
		__rtnl_unlock();
1424
		rtnl = net->rtnl;
1425 1426 1427
		err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
		rtnl_lock();
		return err;
L
Linus Torvalds 已提交
1428 1429 1430 1431 1432 1433
	}

	memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));

	min_len = rtm_min[sz_idx];
	if (nlh->nlmsg_len < min_len)
1434
		return -EINVAL;
L
Linus Torvalds 已提交
1435 1436 1437

	if (nlh->nlmsg_len > min_len) {
		int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
E
Eric Dumazet 已提交
1438
		struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
L
Linus Torvalds 已提交
1439 1440 1441 1442 1443

		while (RTA_OK(attr, attrlen)) {
			unsigned flavor = attr->rta_type;
			if (flavor) {
				if (flavor > rta_max[sz_idx])
1444
					return -EINVAL;
L
Linus Torvalds 已提交
1445 1446 1447 1448 1449 1450
				rta_buf[flavor-1] = attr;
			}
			attr = RTA_NEXT(attr, attrlen);
		}
	}

1451 1452
	doit = rtnl_get_doit(family, type);
	if (doit == NULL)
1453
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
1454

1455
	return doit(skb, nlh, (void *)&rta_buf[0]);
L
Linus Torvalds 已提交
1456 1457
}

1458
static void rtnetlink_rcv(struct sk_buff *skb)
L
Linus Torvalds 已提交
1459
{
1460 1461 1462
	rtnl_lock();
	netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
	rtnl_unlock();
L
Linus Torvalds 已提交
1463 1464 1465 1466 1467
}

static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct net_device *dev = ptr;
1468

L
Linus Torvalds 已提交
1469 1470 1471
	switch (event) {
	case NETDEV_UP:
	case NETDEV_DOWN:
1472
	case NETDEV_PRE_UP:
1473 1474
	case NETDEV_POST_INIT:
	case NETDEV_REGISTER:
L
Linus Torvalds 已提交
1475 1476
	case NETDEV_CHANGE:
	case NETDEV_GOING_DOWN:
1477
	case NETDEV_UNREGISTER:
1478
	case NETDEV_UNREGISTER_BATCH:
L
Linus Torvalds 已提交
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490
		break;
	default:
		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
		break;
	}
	return NOTIFY_DONE;
}

static struct notifier_block rtnetlink_dev_notifier = {
	.notifier_call	= rtnetlink_event,
};

1491

1492
static int __net_init rtnetlink_net_init(struct net *net)
1493 1494 1495 1496 1497 1498 1499 1500 1501 1502
{
	struct sock *sk;
	sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
				   rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
	if (!sk)
		return -ENOMEM;
	net->rtnl = sk;
	return 0;
}

1503
static void __net_exit rtnetlink_net_exit(struct net *net)
1504
{
1505 1506
	netlink_kernel_release(net->rtnl);
	net->rtnl = NULL;
1507 1508 1509 1510 1511 1512 1513
}

static struct pernet_operations rtnetlink_net_ops = {
	.init = rtnetlink_net_init,
	.exit = rtnetlink_net_exit,
};

L
Linus Torvalds 已提交
1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525
void __init rtnetlink_init(void)
{
	int i;

	rtattr_max = 0;
	for (i = 0; i < ARRAY_SIZE(rta_max); i++)
		if (rta_max[i] > rtattr_max)
			rtattr_max = rta_max[i];
	rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
	if (!rta_buf)
		panic("rtnetlink_init: cannot allocate rta_buf\n");

1526
	if (register_pernet_subsys(&rtnetlink_net_ops))
L
Linus Torvalds 已提交
1527
		panic("rtnetlink_init: cannot initialize rtnetlink\n");
1528

L
Linus Torvalds 已提交
1529 1530
	netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
	register_netdevice_notifier(&rtnetlink_dev_notifier);
1531 1532 1533

	rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
	rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
P
Patrick McHardy 已提交
1534 1535
	rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
	rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1536 1537 1538

	rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
	rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
L
Linus Torvalds 已提交
1539 1540
}