rtnetlink.c 47.8 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[RTNL_FAMILY_MAX + 1];
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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;

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	if (protocol <= RTNL_FAMILY_MAX)
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		tab = rtnl_msg_handlers[protocol];
	else
		tab = NULL;

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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;

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	if (protocol <= RTNL_FAMILY_MAX)
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		tab = rtnl_msg_handlers[protocol];
	else
		tab = NULL;

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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;

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	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
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	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
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 * of memory implies no sense in continuing.
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 */
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;

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	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
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	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)
{
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	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
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	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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}

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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;

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	size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
	       nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
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	if (ops->get_size)
		/* IFLA_INFO_DATA + nested data */
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		size += nla_total_size(sizeof(struct nlattr)) +
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			ops->get_size(dev);

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

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static LIST_HEAD(rtnl_af_ops);

static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
{
	const struct rtnl_af_ops *ops;

	list_for_each_entry(ops, &rtnl_af_ops, list) {
		if (ops->family == family)
			return ops;
	}

	return NULL;
}

/**
 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 * @ops: struct rtnl_af_ops * to register
 *
 * The caller must hold the rtnl_mutex.
 *
 * Returns 0 on success or a negative error code.
 */
int __rtnl_af_register(struct rtnl_af_ops *ops)
{
	list_add_tail(&ops->list, &rtnl_af_ops);
	return 0;
}
EXPORT_SYMBOL_GPL(__rtnl_af_register);

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

	rtnl_lock();
	err = __rtnl_af_register(ops);
	rtnl_unlock();
	return err;
}
EXPORT_SYMBOL_GPL(rtnl_af_register);

/**
 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 * @ops: struct rtnl_af_ops * to unregister
 *
 * The caller must hold the rtnl_mutex.
 */
void __rtnl_af_unregister(struct rtnl_af_ops *ops)
{
	list_del(&ops->list);
}
EXPORT_SYMBOL_GPL(__rtnl_af_unregister);

/**
 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 * @ops: struct rtnl_af_ops * to unregister
 */
void rtnl_af_unregister(struct rtnl_af_ops *ops)
{
	rtnl_lock();
	__rtnl_af_unregister(ops);
	rtnl_unlock();
}
EXPORT_SYMBOL_GPL(rtnl_af_unregister);

static size_t rtnl_link_get_af_size(const struct net_device *dev)
{
	struct rtnl_af_ops *af_ops;
	size_t size;

	/* IFLA_AF_SPEC */
	size = nla_total_size(sizeof(struct nlattr));

	list_for_each_entry(af_ops, &rtnl_af_ops, list) {
		if (af_ops->get_link_af_size) {
			/* AF_* + nested data */
			size += nla_total_size(sizeof(struct nlattr)) +
				af_ops->get_link_af_size(dev);
		}
	}

	return size;
}

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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;

E
Eric Dumazet 已提交
627
	switch (transition) {
S
Stefan Rompf 已提交
628 629 630 631 632 633 634 635 636 637 638 639
	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;
640
	}
S
Stefan Rompf 已提交
641 642 643 644 645

	if (dev->operstate != operstate) {
		write_lock_bh(&dev_base_lock);
		dev->operstate = operstate;
		write_unlock_bh(&dev_base_lock);
646 647
		netdev_state_change(dev);
	}
S
Stefan Rompf 已提交
648 649
}

650 651 652 653 654 655 656 657 658 659 660 661 662
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;
}

663
static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
664
				 const struct rtnl_link_stats64 *b)
L
Linus Torvalds 已提交
665
{
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692
	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;
693 694
}

695
static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
696
{
697
	memcpy(v, b, sizeof(*b));
698
}
L
Linus Torvalds 已提交
699

700
/* All VF info */
701 702
static inline int rtnl_vfinfo_size(const struct net_device *dev)
{
703 704 705
	if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {

		int num_vfs = dev_num_vf(dev->dev.parent);
706 707 708 709 710 711
		size_t size = nla_total_size(sizeof(struct nlattr));
		size += nla_total_size(num_vfs * sizeof(struct nlattr));
		size += num_vfs *
			(nla_total_size(sizeof(struct ifla_vf_mac)) +
			 nla_total_size(sizeof(struct ifla_vf_vlan)) +
			 nla_total_size(sizeof(struct ifla_vf_tx_rate)));
712 713
		return size;
	} else
714 715 716
		return 0;
}

717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
static size_t rtnl_port_size(const struct net_device *dev)
{
	size_t port_size = nla_total_size(4)		/* PORT_VF */
		+ nla_total_size(PORT_PROFILE_MAX)	/* PORT_PROFILE */
		+ nla_total_size(sizeof(struct ifla_port_vsi))
							/* PORT_VSI_TYPE */
		+ nla_total_size(PORT_UUID_MAX)		/* PORT_INSTANCE_UUID */
		+ nla_total_size(PORT_UUID_MAX)		/* PORT_HOST_UUID */
		+ nla_total_size(1)			/* PROT_VDP_REQUEST */
		+ nla_total_size(2);			/* PORT_VDP_RESPONSE */
	size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
	size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
		+ port_size;
	size_t port_self_size = nla_total_size(sizeof(struct nlattr))
		+ port_size;

	if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
		return 0;
	if (dev_num_vf(dev->dev.parent))
		return port_self_size + vf_ports_size +
			vf_port_size * dev_num_vf(dev->dev.parent);
	else
		return port_self_size;
}

E
Eric Dumazet 已提交
742
static noinline size_t if_nlmsg_size(const struct net_device *dev)
743 744 745
{
	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
746
	       + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
747 748 749
	       + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
	       + nla_total_size(sizeof(struct rtnl_link_ifmap))
	       + nla_total_size(sizeof(struct rtnl_link_stats))
750
	       + nla_total_size(sizeof(struct rtnl_link_stats64))
751 752 753 754 755 756 757 758
	       + 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
759
	       + nla_total_size(1) /* IFLA_LINKMODE */
760
	       + nla_total_size(4) /* IFLA_NUM_VF */
761
	       + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
762
	       + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
T
Thomas Graf 已提交
763 764
	       + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
	       + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
765 766
}

767 768 769 770 771 772 773 774 775 776 777 778 779
static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
{
	struct nlattr *vf_ports;
	struct nlattr *vf_port;
	int vf;
	int err;

	vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
	if (!vf_ports)
		return -EMSGSIZE;

	for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
		vf_port = nla_nest_start(skb, IFLA_VF_PORT);
780 781
		if (!vf_port)
			goto nla_put_failure;
782 783
		NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
		err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
784 785
		if (err == -EMSGSIZE)
			goto nla_put_failure;
786 787 788 789 790 791 792 793 794 795
		if (err) {
			nla_nest_cancel(skb, vf_port);
			continue;
		}
		nla_nest_end(skb, vf_port);
	}

	nla_nest_end(skb, vf_ports);

	return 0;
796 797 798 799

nla_put_failure:
	nla_nest_cancel(skb, vf_ports);
	return -EMSGSIZE;
800 801 802 803 804 805 806 807 808 809 810 811 812 813
}

static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
{
	struct nlattr *port_self;
	int err;

	port_self = nla_nest_start(skb, IFLA_PORT_SELF);
	if (!port_self)
		return -EMSGSIZE;

	err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
	if (err) {
		nla_nest_cancel(skb, port_self);
814
		return (err == -EMSGSIZE) ? err : 0;
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841
	}

	nla_nest_end(skb, port_self);

	return 0;
}

static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
{
	int err;

	if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
		return 0;

	err = rtnl_port_self_fill(skb, dev);
	if (err)
		return err;

	if (dev_num_vf(dev->dev.parent)) {
		err = rtnl_vf_ports_fill(skb, dev);
		if (err)
			return err;
	}

	return 0;
}

842
static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
843 844
			    int type, u32 pid, u32 seq, u32 change,
			    unsigned int flags)
845 846 847
{
	struct ifinfomsg *ifm;
	struct nlmsghdr *nlh;
848
	struct rtnl_link_stats64 temp;
849
	const struct rtnl_link_stats64 *stats;
T
Thomas Graf 已提交
850 851
	struct nlattr *attr, *af_spec;
	struct rtnl_af_ops *af_ops;
L
Linus Torvalds 已提交
852

853
	ASSERT_RTNL();
854 855
	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
	if (nlh == NULL)
856
		return -EMSGSIZE;
L
Linus Torvalds 已提交
857

858 859 860 861 862 863 864 865 866 867 868 869 870 871
	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);
872
	NLA_PUT_U32(skb, IFLA_GROUP, dev->group);
873 874 875 876 877 878

	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
879

880 881
	if (dev->qdisc)
		NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
S
Stefan Rompf 已提交
882

883 884 885
	if (dev->ifalias)
		NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);

L
Linus Torvalds 已提交
886 887 888 889 890 891 892 893 894
	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,
		};
895
		NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
L
Linus Torvalds 已提交
896 897 898
	}

	if (dev->addr_len) {
899 900
		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
901 902
	}

903 904 905 906
	attr = nla_reserve(skb, IFLA_STATS,
			sizeof(struct rtnl_link_stats));
	if (attr == NULL)
		goto nla_put_failure;
907

908
	stats = dev_get_stats(dev, &temp);
909
	copy_rtnl_link_stats(nla_data(attr), stats);
L
Linus Torvalds 已提交
910

911 912 913 914 915 916
	attr = nla_reserve(skb, IFLA_STATS64,
			sizeof(struct rtnl_link_stats64));
	if (attr == NULL)
		goto nla_put_failure;
	copy_rtnl_link_stats64(nla_data(attr), stats);

917 918 919
	if (dev->dev.parent)
		NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));

920 921 922
	if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
		int i;

923 924 925 926 927 928 929 930 931 932 933
		struct nlattr *vfinfo, *vf;
		int num_vfs = dev_num_vf(dev->dev.parent);

		vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
		if (!vfinfo)
			goto nla_put_failure;
		for (i = 0; i < num_vfs; i++) {
			struct ifla_vf_info ivi;
			struct ifla_vf_mac vf_mac;
			struct ifla_vf_vlan vf_vlan;
			struct ifla_vf_tx_rate vf_tx_rate;
934 935
			if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
				break;
936 937 938 939 940 941 942 943 944 945 946 947 948 949
			vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
			memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
			vf_vlan.vlan = ivi.vlan;
			vf_vlan.qos = ivi.qos;
			vf_tx_rate.rate = ivi.tx_rate;
			vf = nla_nest_start(skb, IFLA_VF_INFO);
			if (!vf) {
				nla_nest_cancel(skb, vfinfo);
				goto nla_put_failure;
			}
			NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
			NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
			NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
			nla_nest_end(skb, vf);
950
		}
951
		nla_nest_end(skb, vfinfo);
952
	}
953 954 955 956

	if (rtnl_port_fill(skb, dev))
		goto nla_put_failure;

P
Patrick McHardy 已提交
957 958 959 960 961
	if (dev->rtnl_link_ops) {
		if (rtnl_link_fill(skb, dev) < 0)
			goto nla_put_failure;
	}

T
Thomas Graf 已提交
962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991
	if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
		goto nla_put_failure;

	list_for_each_entry(af_ops, &rtnl_af_ops, list) {
		if (af_ops->fill_link_af) {
			struct nlattr *af;
			int err;

			if (!(af = nla_nest_start(skb, af_ops->family)))
				goto nla_put_failure;

			err = af_ops->fill_link_af(skb, dev);

			/*
			 * Caller may return ENODATA to indicate that there
			 * was no data to be dumped. This is not an error, it
			 * means we should trim the attribute header and
			 * continue.
			 */
			if (err == -ENODATA)
				nla_nest_cancel(skb, af);
			else if (err < 0)
				goto nla_put_failure;

			nla_nest_end(skb, af);
		}
	}

	nla_nest_end(skb, af_spec);

992 993 994
	return nlmsg_end(skb, nlh);

nla_put_failure:
995 996
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
L
Linus Torvalds 已提交
997 998
}

999
static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
L
Linus Torvalds 已提交
1000
{
1001
	struct net *net = sock_net(skb->sk);
1002 1003
	int h, s_h;
	int idx = 0, s_idx;
L
Linus Torvalds 已提交
1004
	struct net_device *dev;
1005 1006 1007 1008 1009 1010
	struct hlist_head *head;
	struct hlist_node *node;

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

1011
	rcu_read_lock();
1012 1013 1014
	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
		idx = 0;
		head = &net->dev_index_head[h];
1015
		hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1016 1017 1018 1019 1020 1021 1022
			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;
1023
cont:
1024 1025
			idx++;
		}
L
Linus Torvalds 已提交
1026
	}
1027
out:
1028
	rcu_read_unlock();
1029 1030
	cb->args[1] = idx;
	cb->args[0] = h;
L
Linus Torvalds 已提交
1031 1032 1033 1034

	return skb->len;
}

1035
const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1036
	[IFLA_IFNAME]		= { .type = NLA_STRING, .len = IFNAMSIZ-1 },
P
Patrick McHardy 已提交
1037 1038
	[IFLA_ADDRESS]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
	[IFLA_BROADCAST]	= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1039
	[IFLA_MAP]		= { .len = sizeof(struct rtnl_link_ifmap) },
1040
	[IFLA_MTU]		= { .type = NLA_U32 },
1041
	[IFLA_LINK]		= { .type = NLA_U32 },
1042
	[IFLA_MASTER]		= { .type = NLA_U32 },
1043 1044 1045 1046
	[IFLA_TXQLEN]		= { .type = NLA_U32 },
	[IFLA_WEIGHT]		= { .type = NLA_U32 },
	[IFLA_OPERSTATE]	= { .type = NLA_U8 },
	[IFLA_LINKMODE]		= { .type = NLA_U8 },
1047
	[IFLA_LINKINFO]		= { .type = NLA_NESTED },
1048
	[IFLA_NET_NS_PID]	= { .type = NLA_U32 },
1049
	[IFLA_NET_NS_FD]	= { .type = NLA_U32 },
1050
	[IFLA_IFALIAS]	        = { .type = NLA_STRING, .len = IFALIASZ-1 },
1051
	[IFLA_VFINFO_LIST]	= {. type = NLA_NESTED },
1052 1053
	[IFLA_VF_PORTS]		= { .type = NLA_NESTED },
	[IFLA_PORT_SELF]	= { .type = NLA_NESTED },
T
Thomas Graf 已提交
1054
	[IFLA_AF_SPEC]		= { .type = NLA_NESTED },
1055
};
E
Eric Dumazet 已提交
1056
EXPORT_SYMBOL(ifla_policy);
1057

P
Patrick McHardy 已提交
1058 1059 1060 1061 1062
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
	[IFLA_INFO_KIND]	= { .type = NLA_STRING },
	[IFLA_INFO_DATA]	= { .type = NLA_NESTED },
};

1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075
static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
	[IFLA_VF_INFO]		= { .type = NLA_NESTED },
};

static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
	[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) },
};

1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
	[IFLA_PORT_VF]		= { .type = NLA_U32 },
	[IFLA_PORT_PROFILE]	= { .type = NLA_STRING,
				    .len = PORT_PROFILE_MAX },
	[IFLA_PORT_VSI_TYPE]	= { .type = NLA_BINARY,
				    .len = sizeof(struct ifla_port_vsi)},
	[IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
				      .len = PORT_UUID_MAX },
	[IFLA_PORT_HOST_UUID]	= { .type = NLA_STRING,
				    .len = PORT_UUID_MAX },
	[IFLA_PORT_REQUEST]	= { .type = NLA_U8, },
	[IFLA_PORT_RESPONSE]	= { .type = NLA_U16, },
};

1090 1091 1092 1093 1094 1095 1096 1097
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]));
1098 1099
	else if (tb[IFLA_NET_NS_FD])
		net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1100 1101 1102 1103 1104 1105
	else
		net = get_net(src_net);
	return net;
}
EXPORT_SYMBOL(rtnl_link_get_net);

1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
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;
	}

1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
	if (tb[IFLA_AF_SPEC]) {
		struct nlattr *af;
		int rem, err;

		nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
			const struct rtnl_af_ops *af_ops;

			if (!(af_ops = rtnl_af_lookup(nla_type(af))))
				return -EAFNOSUPPORT;

			if (!af_ops->set_link_af)
				return -EOPNOTSUPP;

			if (af_ops->validate_link_af) {
1132
				err = af_ops->validate_link_af(dev, af);
1133 1134 1135 1136 1137 1138
				if (err < 0)
					return err;
			}
		}
	}

1139 1140 1141
	return 0;
}

1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
{
	int rem, err = -EINVAL;
	struct nlattr *vf;
	const struct net_device_ops *ops = dev->netdev_ops;

	nla_for_each_nested(vf, attr, rem) {
		switch (nla_type(vf)) {
		case IFLA_VF_MAC: {
			struct ifla_vf_mac *ivm;
			ivm = nla_data(vf);
			err = -EOPNOTSUPP;
			if (ops->ndo_set_vf_mac)
				err = ops->ndo_set_vf_mac(dev, ivm->vf,
							  ivm->mac);
			break;
		}
		case IFLA_VF_VLAN: {
			struct ifla_vf_vlan *ivv;
			ivv = nla_data(vf);
			err = -EOPNOTSUPP;
			if (ops->ndo_set_vf_vlan)
				err = ops->ndo_set_vf_vlan(dev, ivv->vf,
							   ivv->vlan,
							   ivv->qos);
			break;
		}
		case IFLA_VF_TX_RATE: {
			struct ifla_vf_tx_rate *ivt;
			ivt = nla_data(vf);
			err = -EOPNOTSUPP;
			if (ops->ndo_set_vf_tx_rate)
				err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
							      ivt->rate);
			break;
		}
		default:
			err = -EINVAL;
			break;
		}
		if (err)
			break;
	}
	return err;
}

1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
static int do_set_master(struct net_device *dev, int ifindex)
{
	struct net_device *master_dev;
	const struct net_device_ops *ops;
	int err;

	if (dev->master) {
		if (dev->master->ifindex == ifindex)
			return 0;
		ops = dev->master->netdev_ops;
		if (ops->ndo_del_slave) {
			err = ops->ndo_del_slave(dev->master, dev);
			if (err)
				return err;
		} else {
			return -EOPNOTSUPP;
		}
	}

	if (ifindex) {
		master_dev = __dev_get_by_index(dev_net(dev), ifindex);
		if (!master_dev)
			return -EINVAL;
		ops = master_dev->netdev_ops;
		if (ops->ndo_add_slave) {
			err = ops->ndo_add_slave(master_dev, dev);
			if (err)
				return err;
		} else {
			return -EOPNOTSUPP;
		}
	}
	return 0;
}

1223
static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
P
Patrick McHardy 已提交
1224
		      struct nlattr **tb, char *ifname, int modified)
L
Linus Torvalds 已提交
1225
{
1226
	const struct net_device_ops *ops = dev->netdev_ops;
P
Patrick McHardy 已提交
1227
	int send_addr_notify = 0;
1228
	int err;
L
Linus Torvalds 已提交
1229

1230
	if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1231
		struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
		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;
	}

1243
	if (tb[IFLA_MAP]) {
L
Linus Torvalds 已提交
1244 1245 1246
		struct rtnl_link_ifmap *u_map;
		struct ifmap k_map;

1247
		if (!ops->ndo_set_config) {
L
Linus Torvalds 已提交
1248
			err = -EOPNOTSUPP;
1249
			goto errout;
L
Linus Torvalds 已提交
1250 1251 1252 1253
		}

		if (!netif_device_present(dev)) {
			err = -ENODEV;
1254
			goto errout;
L
Linus Torvalds 已提交
1255 1256
		}

1257
		u_map = nla_data(tb[IFLA_MAP]);
L
Linus Torvalds 已提交
1258 1259 1260 1261 1262 1263 1264
		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;

1265
		err = ops->ndo_set_config(dev, &k_map);
1266
		if (err < 0)
1267
			goto errout;
L
Linus Torvalds 已提交
1268

1269
		modified = 1;
L
Linus Torvalds 已提交
1270 1271
	}

1272
	if (tb[IFLA_ADDRESS]) {
1273 1274 1275
		struct sockaddr *sa;
		int len;

1276
		if (!ops->ndo_set_mac_address) {
L
Linus Torvalds 已提交
1277
			err = -EOPNOTSUPP;
1278
			goto errout;
L
Linus Torvalds 已提交
1279
		}
1280

L
Linus Torvalds 已提交
1281 1282
		if (!netif_device_present(dev)) {
			err = -ENODEV;
1283
			goto errout;
L
Linus Torvalds 已提交
1284 1285
		}

1286 1287 1288 1289
		len = sizeof(sa_family_t) + dev->addr_len;
		sa = kmalloc(len, GFP_KERNEL);
		if (!sa) {
			err = -ENOMEM;
1290
			goto errout;
1291 1292
		}
		sa->sa_family = dev->type;
1293
		memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1294
		       dev->addr_len);
1295
		err = ops->ndo_set_mac_address(dev, sa);
1296
		kfree(sa);
L
Linus Torvalds 已提交
1297
		if (err)
1298
			goto errout;
L
Linus Torvalds 已提交
1299
		send_addr_notify = 1;
1300
		modified = 1;
L
Linus Torvalds 已提交
1301 1302
	}

1303 1304 1305
	if (tb[IFLA_MTU]) {
		err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
		if (err < 0)
1306
			goto errout;
1307
		modified = 1;
L
Linus Torvalds 已提交
1308 1309
	}

1310 1311 1312 1313 1314
	if (tb[IFLA_GROUP]) {
		dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
		modified = 1;
	}

1315 1316 1317 1318 1319
	/*
	 * Interface selected by interface index but interface
	 * name provided implies that a name change has been
	 * requested.
	 */
1320
	if (ifm->ifi_index > 0 && ifname[0]) {
1321 1322
		err = dev_change_name(dev, ifname);
		if (err < 0)
1323
			goto errout;
1324
		modified = 1;
L
Linus Torvalds 已提交
1325 1326
	}

1327 1328 1329 1330 1331 1332 1333 1334
	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;
	}

1335 1336 1337
	if (tb[IFLA_BROADCAST]) {
		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
		send_addr_notify = 1;
L
Linus Torvalds 已提交
1338 1339
	}

1340
	if (ifm->ifi_flags || ifm->ifi_change) {
1341
		err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1342 1343
		if (err < 0)
			goto errout;
1344
	}
L
Linus Torvalds 已提交
1345

1346 1347 1348 1349 1350 1351 1352
	if (tb[IFLA_MASTER]) {
		err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
		if (err)
			goto errout;
		modified = 1;
	}

1353 1354
	if (tb[IFLA_TXQLEN])
		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
S
Stefan Rompf 已提交
1355

1356
	if (tb[IFLA_OPERSTATE])
1357
		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
S
Stefan Rompf 已提交
1358

1359
	if (tb[IFLA_LINKMODE]) {
1360 1361 1362
		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
1363 1364
	}

1365 1366 1367 1368
	if (tb[IFLA_VFINFO_LIST]) {
		struct nlattr *attr;
		int rem;
		nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1369 1370
			if (nla_type(attr) != IFLA_VF_INFO) {
				err = -EINVAL;
1371
				goto errout;
1372
			}
1373 1374 1375 1376 1377
			err = do_setvfinfo(dev, attr);
			if (err < 0)
				goto errout;
			modified = 1;
		}
1378
	}
L
Linus Torvalds 已提交
1379 1380
	err = 0;

1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425
	if (tb[IFLA_VF_PORTS]) {
		struct nlattr *port[IFLA_PORT_MAX+1];
		struct nlattr *attr;
		int vf;
		int rem;

		err = -EOPNOTSUPP;
		if (!ops->ndo_set_vf_port)
			goto errout;

		nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
			if (nla_type(attr) != IFLA_VF_PORT)
				continue;
			err = nla_parse_nested(port, IFLA_PORT_MAX,
				attr, ifla_port_policy);
			if (err < 0)
				goto errout;
			if (!port[IFLA_PORT_VF]) {
				err = -EOPNOTSUPP;
				goto errout;
			}
			vf = nla_get_u32(port[IFLA_PORT_VF]);
			err = ops->ndo_set_vf_port(dev, vf, port);
			if (err < 0)
				goto errout;
			modified = 1;
		}
	}
	err = 0;

	if (tb[IFLA_PORT_SELF]) {
		struct nlattr *port[IFLA_PORT_MAX+1];

		err = nla_parse_nested(port, IFLA_PORT_MAX,
			tb[IFLA_PORT_SELF], ifla_port_policy);
		if (err < 0)
			goto errout;

		err = -EOPNOTSUPP;
		if (ops->ndo_set_vf_port)
			err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
		if (err < 0)
			goto errout;
		modified = 1;
	}
T
Thomas Graf 已提交
1426 1427 1428 1429 1430 1431 1432 1433 1434

	if (tb[IFLA_AF_SPEC]) {
		struct nlattr *af;
		int rem;

		nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
			const struct rtnl_af_ops *af_ops;

			if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1435
				BUG();
T
Thomas Graf 已提交
1436

1437
			err = af_ops->set_link_af(dev, af);
T
Thomas Graf 已提交
1438 1439 1440 1441 1442 1443
			if (err < 0)
				goto errout;

			modified = 1;
		}
	}
1444 1445
	err = 0;

1446
errout:
1447 1448
	if (err < 0 && modified && net_ratelimit())
		printk(KERN_WARNING "A link change request failed with "
L
Lucas De Marchi 已提交
1449
		       "some changes committed already. Interface %s may "
1450 1451 1452
		       "have been left with an inconsistent configuration, "
		       "please check.\n", dev->name);

L
Linus Torvalds 已提交
1453 1454
	if (send_addr_notify)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1455 1456
	return err;
}
L
Linus Torvalds 已提交
1457

1458 1459
static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
1460
	struct net *net = sock_net(skb->sk);
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478
	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)
1479
		dev = __dev_get_by_index(net, ifm->ifi_index);
1480
	else if (tb[IFLA_IFNAME])
1481
		dev = __dev_get_by_name(net, ifname);
1482 1483 1484 1485 1486 1487 1488 1489
	else
		goto errout;

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

E
Eric Dumazet 已提交
1490 1491
	err = validate_linkmsg(dev, tb);
	if (err < 0)
1492
		goto errout;
1493

P
Patrick McHardy 已提交
1494
	err = do_setlink(dev, ifm, tb, ifname, 0);
1495
errout:
L
Linus Torvalds 已提交
1496 1497 1498
	return err;
}

P
Patrick McHardy 已提交
1499 1500
static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
1501
	struct net *net = sock_net(skb->sk);
P
Patrick McHardy 已提交
1502 1503 1504 1505 1506 1507
	const struct rtnl_link_ops *ops;
	struct net_device *dev;
	struct ifinfomsg *ifm;
	char ifname[IFNAMSIZ];
	struct nlattr *tb[IFLA_MAX+1];
	int err;
1508
	LIST_HEAD(list_kill);
P
Patrick McHardy 已提交
1509 1510 1511 1512 1513 1514 1515 1516 1517 1518

	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)
1519
		dev = __dev_get_by_index(net, ifm->ifi_index);
P
Patrick McHardy 已提交
1520
	else if (tb[IFLA_IFNAME])
1521
		dev = __dev_get_by_name(net, ifname);
P
Patrick McHardy 已提交
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531
	else
		return -EINVAL;

	if (!dev)
		return -ENODEV;

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

1532 1533 1534
	ops->dellink(dev, &list_kill);
	unregister_netdevice_many(&list_kill);
	list_del(&list_kill);
P
Patrick McHardy 已提交
1535 1536 1537
	return 0;
}

1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557
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);

1558 1559
struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
	char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1560 1561 1562
{
	int err;
	struct net_device *dev;
E
Eric Dumazet 已提交
1563 1564
	unsigned int num_queues = 1;
	unsigned int real_num_queues = 1;
1565

E
Eric Dumazet 已提交
1566
	if (ops->get_tx_queues) {
1567
		err = ops->get_tx_queues(src_net, tb, &num_queues,
E
Eric Dumazet 已提交
1568
					 &real_num_queues);
E
Eric Dumazet 已提交
1569 1570 1571
		if (err)
			goto err;
	}
1572
	err = -ENOMEM;
E
Eric Dumazet 已提交
1573
	dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1574 1575 1576
	if (!dev)
		goto err;

1577 1578
	dev_net_set(dev, net);
	dev->rtnl_link_ops = ops;
1579
	dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
E
Eric Dumazet 已提交
1580
	dev->real_num_tx_queues = real_num_queues;
1581

1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
	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])
1593
		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1594 1595
	if (tb[IFLA_LINKMODE])
		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1596 1597
	if (tb[IFLA_GROUP])
		dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1598 1599 1600 1601 1602 1603

	return dev;

err:
	return ERR_PTR(err);
}
E
Eric Dumazet 已提交
1604
EXPORT_SYMBOL(rtnl_create_link);
1605

1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
static int rtnl_group_changelink(struct net *net, int group,
		struct ifinfomsg *ifm,
		struct nlattr **tb)
{
	struct net_device *dev;
	int err;

	for_each_netdev(net, dev) {
		if (dev->group == group) {
			err = do_setlink(dev, ifm, tb, NULL, 0);
			if (err < 0)
				return err;
		}
	}

	return 0;
}

P
Patrick McHardy 已提交
1624 1625
static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
1626
	struct net *net = sock_net(skb->sk);
P
Patrick McHardy 已提交
1627 1628 1629 1630 1631 1632 1633 1634 1635
	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;

1636
#ifdef CONFIG_MODULES
P
Patrick McHardy 已提交
1637
replay:
1638
#endif
P
Patrick McHardy 已提交
1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649
	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)
1650
		dev = __dev_get_by_index(net, ifm->ifi_index);
1651 1652 1653 1654 1655 1656
	else {
		if (ifname[0])
			dev = __dev_get_by_name(net, ifname);
		else
			dev = NULL;
	}
P
Patrick McHardy 已提交
1657

E
Eric Dumazet 已提交
1658 1659
	err = validate_linkmsg(dev, tb);
	if (err < 0)
1660 1661
		return err;

P
Patrick McHardy 已提交
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
	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;
1680
		struct net *dest_net;
P
Patrick McHardy 已提交
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719

		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);
		}

1720 1721 1722 1723 1724
		if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
			if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
				return rtnl_group_changelink(net,
						nla_get_u32(tb[IFLA_GROUP]),
						ifm, tb);
P
Patrick McHardy 已提交
1725
			return -ENODEV;
1726
		}
P
Patrick McHardy 已提交
1727

1728
		if (ifm->ifi_index)
P
Patrick McHardy 已提交
1729
			return -EOPNOTSUPP;
1730
		if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
P
Patrick McHardy 已提交
1731 1732 1733
			return -EOPNOTSUPP;

		if (!ops) {
1734
#ifdef CONFIG_MODULES
P
Patrick McHardy 已提交
1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748
			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);
1749

1750
		dest_net = rtnl_link_get_net(net, tb);
1751 1752 1753
		if (IS_ERR(dest_net))
			return PTR_ERR(dest_net);

1754
		dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1755 1756 1757 1758

		if (IS_ERR(dev))
			err = PTR_ERR(dev);
		else if (ops->newlink)
1759
			err = ops->newlink(net, dev, tb, data);
1760 1761
		else
			err = register_netdevice(dev);
1762 1763

		if (err < 0 && !IS_ERR(dev))
P
Patrick McHardy 已提交
1764
			free_netdev(dev);
1765
		if (err < 0)
1766
			goto out;
1767

1768 1769 1770 1771
		err = rtnl_configure_link(dev, ifm);
		if (err < 0)
			unregister_netdevice(dev);
out:
1772
		put_net(dest_net);
P
Patrick McHardy 已提交
1773 1774 1775 1776
		return err;
	}
}

1777
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1778
{
1779
	struct net *net = sock_net(skb->sk);
1780
	struct ifinfomsg *ifm;
1781
	char ifname[IFNAMSIZ];
1782 1783 1784
	struct nlattr *tb[IFLA_MAX+1];
	struct net_device *dev = NULL;
	struct sk_buff *nskb;
1785
	int err;
1786

1787 1788
	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
	if (err < 0)
1789
		return err;
1790

1791 1792 1793
	if (tb[IFLA_IFNAME])
		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);

1794
	ifm = nlmsg_data(nlh);
1795 1796 1797 1798 1799
	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
1800 1801
		return -EINVAL;

1802 1803 1804
	if (dev == NULL)
		return -ENODEV;

P
Patrick McHardy 已提交
1805
	nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1806 1807
	if (nskb == NULL)
		return -ENOBUFS;
1808

1809 1810
	err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
			       nlh->nlmsg_seq, 0, 0);
1811 1812 1813 1814
	if (err < 0) {
		/* -EMSGSIZE implies BUG in if_nlmsg_size */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(nskb);
1815 1816
	} else
		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1817

1818
	return err;
1819 1820
}

A
Adrian Bunk 已提交
1821
static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
L
Linus Torvalds 已提交
1822 1823 1824 1825 1826 1827
{
	int idx;
	int s_idx = cb->family;

	if (s_idx == 0)
		s_idx = 1;
1828
	for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
L
Linus Torvalds 已提交
1829 1830 1831
		int type = cb->nlh->nlmsg_type-RTM_BASE;
		if (idx < s_idx || idx == PF_PACKET)
			continue;
1832 1833
		if (rtnl_msg_handlers[idx] == NULL ||
		    rtnl_msg_handlers[idx][type].dumpit == NULL)
L
Linus Torvalds 已提交
1834 1835 1836
			continue;
		if (idx > s_idx)
			memset(&cb->args[0], 0, sizeof(cb->args));
1837
		if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
L
Linus Torvalds 已提交
1838 1839 1840 1841 1842 1843 1844 1845 1846
			break;
	}
	cb->family = idx;

	return skb->len;
}

void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
{
1847
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
1848
	struct sk_buff *skb;
1849
	int err = -ENOBUFS;
L
Linus Torvalds 已提交
1850

P
Patrick McHardy 已提交
1851
	skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1852 1853
	if (skb == NULL)
		goto errout;
L
Linus Torvalds 已提交
1854

1855
	err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1856 1857 1858 1859 1860 1861
	if (err < 0) {
		/* -EMSGSIZE implies BUG in if_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
1862 1863
	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
	return;
1864 1865
errout:
	if (err < 0)
1866
		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
L
Linus Torvalds 已提交
1867 1868 1869 1870 1871 1872 1873 1874
}

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

/* Process one rtnetlink message. */

1875
static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
L
Linus Torvalds 已提交
1876
{
1877
	struct net *net = sock_net(skb->sk);
1878
	rtnl_doit_func doit;
L
Linus Torvalds 已提交
1879 1880 1881 1882
	int sz_idx, kind;
	int min_len;
	int family;
	int type;
1883
	int err;
L
Linus Torvalds 已提交
1884 1885 1886

	type = nlh->nlmsg_type;
	if (type > RTM_MAX)
1887
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
1888 1889 1890 1891 1892 1893 1894

	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
1895
	family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
L
Linus Torvalds 已提交
1896 1897 1898
	sz_idx = type>>2;
	kind = type&3;

1899 1900
	if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
		return -EPERM;
L
Linus Torvalds 已提交
1901

1902
	if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1903
		struct sock *rtnl;
1904
		rtnl_dumpit_func dumpit;
L
Linus Torvalds 已提交
1905

1906 1907
		dumpit = rtnl_get_dumpit(family, type);
		if (dumpit == NULL)
1908
			return -EOPNOTSUPP;
1909

1910
		__rtnl_unlock();
1911
		rtnl = net->rtnl;
1912 1913 1914
		err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
		rtnl_lock();
		return err;
L
Linus Torvalds 已提交
1915 1916 1917 1918 1919 1920
	}

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

	min_len = rtm_min[sz_idx];
	if (nlh->nlmsg_len < min_len)
1921
		return -EINVAL;
L
Linus Torvalds 已提交
1922 1923 1924

	if (nlh->nlmsg_len > min_len) {
		int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
E
Eric Dumazet 已提交
1925
		struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
L
Linus Torvalds 已提交
1926 1927 1928 1929 1930

		while (RTA_OK(attr, attrlen)) {
			unsigned flavor = attr->rta_type;
			if (flavor) {
				if (flavor > rta_max[sz_idx])
1931
					return -EINVAL;
L
Linus Torvalds 已提交
1932 1933 1934 1935 1936 1937
				rta_buf[flavor-1] = attr;
			}
			attr = RTA_NEXT(attr, attrlen);
		}
	}

1938 1939
	doit = rtnl_get_doit(family, type);
	if (doit == NULL)
1940
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
1941

1942
	return doit(skb, nlh, (void *)&rta_buf[0]);
L
Linus Torvalds 已提交
1943 1944
}

1945
static void rtnetlink_rcv(struct sk_buff *skb)
L
Linus Torvalds 已提交
1946
{
1947 1948 1949
	rtnl_lock();
	netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
	rtnl_unlock();
L
Linus Torvalds 已提交
1950 1951 1952 1953 1954
}

static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct net_device *dev = ptr;
1955

L
Linus Torvalds 已提交
1956 1957 1958
	switch (event) {
	case NETDEV_UP:
	case NETDEV_DOWN:
1959
	case NETDEV_PRE_UP:
1960 1961
	case NETDEV_POST_INIT:
	case NETDEV_REGISTER:
L
Linus Torvalds 已提交
1962
	case NETDEV_CHANGE:
1963
	case NETDEV_PRE_TYPE_CHANGE:
L
Linus Torvalds 已提交
1964
	case NETDEV_GOING_DOWN:
1965
	case NETDEV_UNREGISTER:
1966
	case NETDEV_UNREGISTER_BATCH:
1967 1968
	case NETDEV_RELEASE:
	case NETDEV_JOIN:
L
Linus Torvalds 已提交
1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980
		break;
	default:
		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
		break;
	}
	return NOTIFY_DONE;
}

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

1981

1982
static int __net_init rtnetlink_net_init(struct net *net)
1983 1984 1985
{
	struct sock *sk;
	sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1986
				   rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1987 1988 1989 1990 1991 1992
	if (!sk)
		return -ENOMEM;
	net->rtnl = sk;
	return 0;
}

1993
static void __net_exit rtnetlink_net_exit(struct net *net)
1994
{
1995 1996
	netlink_kernel_release(net->rtnl);
	net->rtnl = NULL;
1997 1998 1999 2000 2001 2002 2003
}

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

L
Linus Torvalds 已提交
2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
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");

2016
	if (register_pernet_subsys(&rtnetlink_net_ops))
L
Linus Torvalds 已提交
2017
		panic("rtnetlink_init: cannot initialize rtnetlink\n");
2018

L
Linus Torvalds 已提交
2019 2020
	netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
	register_netdevice_notifier(&rtnetlink_dev_notifier);
2021 2022 2023

	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
2024 2025
	rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
	rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
2026 2027 2028

	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
2029 2030
}