rtnetlink.c 32.7 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/nsproxy.h>
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#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/string.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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struct rtnl_link
{
	rtnl_doit_func		doit;
	rtnl_dumpit_func	dumpit;
};

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static DEFINE_MUTEX(rtnl_mutex);
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static struct sock *rtnl;
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void rtnl_lock(void)
{
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	mutex_lock(&rtnl_mutex);
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}

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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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	mutex_unlock(&rtnl_mutex);
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	netdev_run_todo();
}

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int rtnl_trylock(void)
{
	return mutex_trylock(&rtnl_mutex);
}

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int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
{
	memset(tb, 0, sizeof(struct rtattr*)*maxattr);

	while (RTA_OK(rta, len)) {
		unsigned flavor = rta->rta_type;
		if (flavor && flavor <= maxattr)
			tb[flavor-1] = rta;
		rta = RTA_NEXT(rta, len);
	}
	return 0;
}

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int __rtattr_parse_nested_compat(struct rtattr *tb[], int maxattr,
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				 struct rtattr *rta, int len)
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{
	if (RTA_PAYLOAD(rta) < len)
		return -1;
	if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
		rta = RTA_DATA(rta) + RTA_ALIGN(len);
		return rtattr_parse_nested(tb, maxattr, rta);
	}
	memset(tb, 0, sizeof(struct rtattr *) * maxattr);
	return 0;
}

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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)
		ops->dellink = unregister_netdevice;

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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);

/**
 * __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_device *dev, *n;
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	struct net *net;
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	for_each_net(net) {
		for_each_netdev_safe(net, dev, n) {
			if (dev->rtnl_link_ops == ops)
				ops->dellink(dev);
		}
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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);

	rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
	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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}

size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
{
	size_t ret = RTA_PAYLOAD(rta);
	char *src = RTA_DATA(rta);

	if (ret > 0 && src[ret - 1] == '\0')
		ret--;
	if (size > 0) {
		size_t len = (ret >= size) ? size - 1 : ret;
		memset(dest, 0, size);
		memcpy(dest, src, len);
	}
	return ret;
}

int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
{
	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, u32 pid)
{
	return nlmsg_unicast(rtnl, skb, pid);
}

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int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
		struct nlmsghdr *nlh, gfp_t flags)
{
	int report = 0;

	if (nlh)
		report = nlmsg_report(nlh);

	return nlmsg_notify(rtnl, skb, pid, group, report, flags);
}

void rtnl_set_sk_err(u32 group, int error)
{
	netlink_set_err(rtnl, 0, group, error);
}

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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:
	return nla_nest_cancel(skb, mx);
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}

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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)
{
	unsigned char operstate = dev->operstate;

	switch(transition) {
	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);
		netdev_state_change(dev);
	}
}

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static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
				 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 size_t if_nlmsg_size(const struct net_device *dev)
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{
	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
	       + 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 */
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	       + nla_total_size(1) /* IFLA_LINKMODE */
	       + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
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}

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static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
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			    int type, u32 pid, u32 seq, u32 change,
			    unsigned int flags)
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{
	struct ifinfomsg *ifm;
	struct nlmsghdr *nlh;
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625 626
	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
	if (nlh == NULL)
627
		return -EMSGSIZE;
L
Linus Torvalds 已提交
628

629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648
	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
649

650 651
	if (dev->qdisc_sleeping)
		NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
S
Stefan Rompf 已提交
652

L
Linus Torvalds 已提交
653 654 655 656 657 658 659 660 661
	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,
		};
662
		NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
L
Linus Torvalds 已提交
663 664 665
	}

	if (dev->addr_len) {
666 667
		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
668 669 670
	}

	if (dev->get_stats) {
671
		struct net_device_stats *stats = dev->get_stats(dev);
L
Linus Torvalds 已提交
672
		if (stats) {
673 674 675 676 677 678 679 680
			struct nlattr *attr;

			attr = nla_reserve(skb, IFLA_STATS,
					   sizeof(struct rtnl_link_stats));
			if (attr == NULL)
				goto nla_put_failure;

			copy_rtnl_link_stats(nla_data(attr), stats);
L
Linus Torvalds 已提交
681 682 683
		}
	}

P
Patrick McHardy 已提交
684 685 686 687 688
	if (dev->rtnl_link_ops) {
		if (rtnl_link_fill(skb, dev) < 0)
			goto nla_put_failure;
	}

689 690 691
	return nlmsg_end(skb, nlh);

nla_put_failure:
692 693
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
L
Linus Torvalds 已提交
694 695
}

696
static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
L
Linus Torvalds 已提交
697
{
698
	struct net *net = skb->sk->sk_net;
L
Linus Torvalds 已提交
699 700 701 702
	int idx;
	int s_idx = cb->args[0];
	struct net_device *dev;

703
	idx = 0;
704
	for_each_netdev(net, dev) {
L
Linus Torvalds 已提交
705
		if (idx < s_idx)
706
			goto cont;
707
		if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
708 709
				     NETLINK_CB(cb->skb).pid,
				     cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
L
Linus Torvalds 已提交
710
			break;
711 712
cont:
		idx++;
L
Linus Torvalds 已提交
713 714 715 716 717 718
	}
	cb->args[0] = idx;

	return skb->len;
}

719
const struct nla_policy ifla_policy[IFLA_MAX+1] = {
720
	[IFLA_IFNAME]		= { .type = NLA_STRING, .len = IFNAMSIZ-1 },
P
Patrick McHardy 已提交
721 722
	[IFLA_ADDRESS]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
	[IFLA_BROADCAST]	= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
723
	[IFLA_MAP]		= { .len = sizeof(struct rtnl_link_ifmap) },
724 725 726 727 728
	[IFLA_MTU]		= { .type = NLA_U32 },
	[IFLA_TXQLEN]		= { .type = NLA_U32 },
	[IFLA_WEIGHT]		= { .type = NLA_U32 },
	[IFLA_OPERSTATE]	= { .type = NLA_U8 },
	[IFLA_LINKMODE]		= { .type = NLA_U8 },
729
	[IFLA_NET_NS_PID]	= { .type = NLA_U32 },
730 731
};

P
Patrick McHardy 已提交
732 733 734 735 736
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
	[IFLA_INFO_KIND]	= { .type = NLA_STRING },
	[IFLA_INFO_DATA]	= { .type = NLA_NESTED },
};

737 738 739 740 741 742 743 744 745 746
static struct net *get_net_ns_by_pid(pid_t pid)
{
	struct task_struct *tsk;
	struct net *net;

	/* Lookup the network namespace */
	net = ERR_PTR(-ESRCH);
	rcu_read_lock();
	tsk = find_task_by_pid(pid);
	if (tsk) {
747 748 749 750
		struct nsproxy *nsproxy;
		nsproxy = task_nsproxy(tsk);
		if (nsproxy)
			net = get_net(nsproxy->net_ns);
751 752 753 754 755
	}
	rcu_read_unlock();
	return net;
}

756
static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
P
Patrick McHardy 已提交
757
		      struct nlattr **tb, char *ifname, int modified)
L
Linus Torvalds 已提交
758
{
P
Patrick McHardy 已提交
759
	int send_addr_notify = 0;
760
	int err;
L
Linus Torvalds 已提交
761

762 763 764 765 766 767 768 769 770 771 772 773 774 775
	if (tb[IFLA_NET_NS_PID]) {
		struct net *net;
		net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
		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;
	}

776
	if (tb[IFLA_MAP]) {
L
Linus Torvalds 已提交
777 778 779 780 781
		struct rtnl_link_ifmap *u_map;
		struct ifmap k_map;

		if (!dev->set_config) {
			err = -EOPNOTSUPP;
782
			goto errout;
L
Linus Torvalds 已提交
783 784 785 786
		}

		if (!netif_device_present(dev)) {
			err = -ENODEV;
787
			goto errout;
L
Linus Torvalds 已提交
788 789
		}

790
		u_map = nla_data(tb[IFLA_MAP]);
L
Linus Torvalds 已提交
791 792 793 794 795 796 797 798
		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;

		err = dev->set_config(dev, &k_map);
799
		if (err < 0)
800
			goto errout;
L
Linus Torvalds 已提交
801

802
		modified = 1;
L
Linus Torvalds 已提交
803 804
	}

805
	if (tb[IFLA_ADDRESS]) {
806 807 808
		struct sockaddr *sa;
		int len;

L
Linus Torvalds 已提交
809 810
		if (!dev->set_mac_address) {
			err = -EOPNOTSUPP;
811
			goto errout;
L
Linus Torvalds 已提交
812
		}
813

L
Linus Torvalds 已提交
814 815
		if (!netif_device_present(dev)) {
			err = -ENODEV;
816
			goto errout;
L
Linus Torvalds 已提交
817 818
		}

819 820 821 822
		len = sizeof(sa_family_t) + dev->addr_len;
		sa = kmalloc(len, GFP_KERNEL);
		if (!sa) {
			err = -ENOMEM;
823
			goto errout;
824 825
		}
		sa->sa_family = dev->type;
826
		memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
827 828 829
		       dev->addr_len);
		err = dev->set_mac_address(dev, sa);
		kfree(sa);
L
Linus Torvalds 已提交
830
		if (err)
831
			goto errout;
L
Linus Torvalds 已提交
832
		send_addr_notify = 1;
833
		modified = 1;
L
Linus Torvalds 已提交
834 835
	}

836 837 838
	if (tb[IFLA_MTU]) {
		err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
		if (err < 0)
839
			goto errout;
840
		modified = 1;
L
Linus Torvalds 已提交
841 842
	}

843 844 845 846 847
	/*
	 * Interface selected by interface index but interface
	 * name provided implies that a name change has been
	 * requested.
	 */
848
	if (ifm->ifi_index > 0 && ifname[0]) {
849 850
		err = dev_change_name(dev, ifname);
		if (err < 0)
851
			goto errout;
852
		modified = 1;
L
Linus Torvalds 已提交
853 854
	}

855 856 857
	if (tb[IFLA_BROADCAST]) {
		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
		send_addr_notify = 1;
L
Linus Torvalds 已提交
858 859
	}

860 861 862 863 864 865 866 867 868
	if (ifm->ifi_flags || ifm->ifi_change) {
		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);
		dev_change_flags(dev, flags);
	}
L
Linus Torvalds 已提交
869

870 871
	if (tb[IFLA_TXQLEN])
		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
S
Stefan Rompf 已提交
872

873 874
	if (tb[IFLA_OPERSTATE])
		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
S
Stefan Rompf 已提交
875

876
	if (tb[IFLA_LINKMODE]) {
S
Stefan Rompf 已提交
877
		write_lock_bh(&dev_base_lock);
878
		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
S
Stefan Rompf 已提交
879 880 881
		write_unlock_bh(&dev_base_lock);
	}

L
Linus Torvalds 已提交
882 883
	err = 0;

884
errout:
885 886 887 888 889 890
	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
891 892
	if (send_addr_notify)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
893 894
	return err;
}
L
Linus Torvalds 已提交
895

896 897
static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
898
	struct net *net = skb->sk->sk_net;
899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
	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)
917
		dev = dev_get_by_index(net, ifm->ifi_index);
918
	else if (tb[IFLA_IFNAME])
919
		dev = dev_get_by_name(net, ifname);
920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935
	else
		goto errout;

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

	if (tb[IFLA_ADDRESS] &&
	    nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
		goto errout_dev;

	if (tb[IFLA_BROADCAST] &&
	    nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
		goto errout_dev;

P
Patrick McHardy 已提交
936
	err = do_setlink(dev, ifm, tb, ifname, 0);
937
errout_dev:
L
Linus Torvalds 已提交
938
	dev_put(dev);
939
errout:
L
Linus Torvalds 已提交
940 941 942
	return err;
}

P
Patrick McHardy 已提交
943 944
static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
945
	struct net *net = skb->sk->sk_net;
P
Patrick McHardy 已提交
946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
	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)
962
		dev = __dev_get_by_index(net, ifm->ifi_index);
P
Patrick McHardy 已提交
963
	else if (tb[IFLA_IFNAME])
964
		dev = __dev_get_by_name(net, ifname);
P
Patrick McHardy 已提交
965 966 967 968 969 970 971 972 973 974 975 976 977 978
	else
		return -EINVAL;

	if (!dev)
		return -ENODEV;

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

	ops->dellink(dev);
	return 0;
}

979
struct net_device *rtnl_create_link(struct net *net, char *ifname,
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995
		const struct rtnl_link_ops *ops, struct nlattr *tb[])
{
	int err;
	struct net_device *dev;

	err = -ENOMEM;
	dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
	if (!dev)
		goto err;

	if (strchr(dev->name, '%')) {
		err = dev_alloc_name(dev, dev->name);
		if (err < 0)
			goto err_free;
	}

996
	dev->nd_net = net;
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
	dev->rtnl_link_ops = ops;

	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])
		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
	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);
}

P
Patrick McHardy 已提交
1022 1023
static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
1024
	struct net *net = skb->sk->sk_net;
P
Patrick McHardy 已提交
1025 1026 1027 1028 1029 1030 1031 1032 1033
	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;

1034
#ifdef CONFIG_KMOD
P
Patrick McHardy 已提交
1035
replay:
1036
#endif
P
Patrick McHardy 已提交
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
	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)
1048
		dev = __dev_get_by_index(net, ifm->ifi_index);
P
Patrick McHardy 已提交
1049
	else if (ifname[0])
1050
		dev = __dev_get_by_name(net, ifname);
P
Patrick McHardy 已提交
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
	else
		dev = NULL;

	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;

		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;

		if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
			return -EOPNOTSUPP;
1116
		if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
P
Patrick McHardy 已提交
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
			return -EOPNOTSUPP;

		if (!ops) {
#ifdef CONFIG_KMOD
			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);
1135

1136
		dev = rtnl_create_link(net, ifname, ops, tb);
1137 1138 1139 1140

		if (IS_ERR(dev))
			err = PTR_ERR(dev);
		else if (ops->newlink)
1141 1142 1143
			err = ops->newlink(dev, tb, data);
		else
			err = register_netdevice(dev);
1144 1145

		if (err < 0 && !IS_ERR(dev))
P
Patrick McHardy 已提交
1146 1147 1148 1149 1150
			free_netdev(dev);
		return err;
	}
}

1151
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1152
{
1153
	struct net *net = skb->sk->sk_net;
1154 1155 1156 1157
	struct ifinfomsg *ifm;
	struct nlattr *tb[IFLA_MAX+1];
	struct net_device *dev = NULL;
	struct sk_buff *nskb;
1158
	int err;
1159

1160 1161
	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
	if (err < 0)
1162
		return err;
1163 1164

	ifm = nlmsg_data(nlh);
1165
	if (ifm->ifi_index > 0) {
1166
		dev = dev_get_by_index(net, ifm->ifi_index);
1167 1168 1169
		if (dev == NULL)
			return -ENODEV;
	} else
1170 1171
		return -EINVAL;

P
Patrick McHardy 已提交
1172
	nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1173 1174 1175 1176 1177
	if (nskb == NULL) {
		err = -ENOBUFS;
		goto errout;
	}

1178 1179
	err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
			       nlh->nlmsg_seq, 0, 0);
1180 1181 1182 1183 1184 1185
	if (err < 0) {
		/* -EMSGSIZE implies BUG in if_nlmsg_size */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(nskb);
		goto errout;
	}
1186
	err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
1187
errout:
1188 1189
	dev_put(dev);

1190
	return err;
1191 1192
}

A
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1193
static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
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{
	int idx;
	int s_idx = cb->family;

	if (s_idx == 0)
		s_idx = 1;
	for (idx=1; idx<NPROTO; idx++) {
		int type = cb->nlh->nlmsg_type-RTM_BASE;
		if (idx < s_idx || idx == PF_PACKET)
			continue;
1204 1205
		if (rtnl_msg_handlers[idx] == NULL ||
		    rtnl_msg_handlers[idx][type].dumpit == NULL)
L
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			continue;
		if (idx > s_idx)
			memset(&cb->args[0], 0, sizeof(cb->args));
1209
		if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
L
Linus Torvalds 已提交
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			break;
	}
	cb->family = idx;

	return skb->len;
}

void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
{
	struct sk_buff *skb;
1220
	int err = -ENOBUFS;
L
Linus Torvalds 已提交
1221

P
Patrick McHardy 已提交
1222
	skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1223 1224
	if (skb == NULL)
		goto errout;
L
Linus Torvalds 已提交
1225

1226
	err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1227 1228 1229 1230 1231 1232
	if (err < 0) {
		/* -EMSGSIZE implies BUG in if_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
1233 1234 1235 1236
	err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
errout:
	if (err < 0)
		rtnl_set_sk_err(RTNLGRP_LINK, err);
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}

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

/* Process one rtnetlink message. */

1245
static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
L
Linus Torvalds 已提交
1246
{
1247
	rtnl_doit_func doit;
L
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1248 1249 1250 1251
	int sz_idx, kind;
	int min_len;
	int family;
	int type;
1252
	int err;
L
Linus Torvalds 已提交
1253 1254 1255

	type = nlh->nlmsg_type;
	if (type > RTM_MAX)
1256
		return -EOPNOTSUPP;
L
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1257 1258 1259 1260 1261 1262 1263 1264

	type -= RTM_BASE;

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

	family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1265 1266
	if (family >= NPROTO)
		return -EAFNOSUPPORT;
L
Linus Torvalds 已提交
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	sz_idx = type>>2;
	kind = type&3;

1271 1272
	if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
		return -EPERM;
L
Linus Torvalds 已提交
1273 1274

	if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1275
		rtnl_dumpit_func dumpit;
L
Linus Torvalds 已提交
1276

1277 1278
		dumpit = rtnl_get_dumpit(family, type);
		if (dumpit == NULL)
1279
			return -EOPNOTSUPP;
1280

1281 1282 1283 1284
		__rtnl_unlock();
		err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
		rtnl_lock();
		return err;
L
Linus Torvalds 已提交
1285 1286 1287 1288 1289 1290
	}

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

	min_len = rtm_min[sz_idx];
	if (nlh->nlmsg_len < min_len)
1291
		return -EINVAL;
L
Linus Torvalds 已提交
1292 1293 1294 1295 1296 1297 1298 1299 1300

	if (nlh->nlmsg_len > min_len) {
		int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
		struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);

		while (RTA_OK(attr, attrlen)) {
			unsigned flavor = attr->rta_type;
			if (flavor) {
				if (flavor > rta_max[sz_idx])
1301
					return -EINVAL;
L
Linus Torvalds 已提交
1302 1303 1304 1305 1306 1307
				rta_buf[flavor-1] = attr;
			}
			attr = RTA_NEXT(attr, attrlen);
		}
	}

1308 1309
	doit = rtnl_get_doit(family, type);
	if (doit == NULL)
1310
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
1311

1312
	return doit(skb, nlh, (void *)&rta_buf[0]);
L
Linus Torvalds 已提交
1313 1314
}

1315
static void rtnetlink_rcv(struct sk_buff *skb)
L
Linus Torvalds 已提交
1316
{
1317 1318 1319
	rtnl_lock();
	netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
	rtnl_unlock();
L
Linus Torvalds 已提交
1320 1321 1322 1323 1324
}

static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct net_device *dev = ptr;
1325 1326 1327 1328

	if (dev->nd_net != &init_net)
		return NOTIFY_DONE;

L
Linus Torvalds 已提交
1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365
	switch (event) {
	case NETDEV_UNREGISTER:
		rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
		break;
	case NETDEV_REGISTER:
		rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
		break;
	case NETDEV_UP:
	case NETDEV_DOWN:
		rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
		break;
	case NETDEV_CHANGE:
	case NETDEV_GOING_DOWN:
		break;
	default:
		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
		break;
	}
	return NOTIFY_DONE;
}

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

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");

1366 1367
	rtnl = netlink_kernel_create(&init_net, NETLINK_ROUTE, RTNLGRP_MAX,
				     rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
L
Linus Torvalds 已提交
1368 1369 1370 1371
	if (rtnl == NULL)
		panic("rtnetlink_init: cannot initialize rtnetlink\n");
	netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
	register_netdevice_notifier(&rtnetlink_dev_notifier);
1372 1373 1374

	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
1375 1376
	rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
	rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1377 1378 1379

	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
1380 1381 1382 1383 1384
}

EXPORT_SYMBOL(__rta_fill);
EXPORT_SYMBOL(rtattr_strlcpy);
EXPORT_SYMBOL(rtattr_parse);
1385
EXPORT_SYMBOL(__rtattr_parse_nested_compat);
L
Linus Torvalds 已提交
1386 1387
EXPORT_SYMBOL(rtnetlink_put_metrics);
EXPORT_SYMBOL(rtnl_lock);
1388
EXPORT_SYMBOL(rtnl_trylock);
L
Linus Torvalds 已提交
1389
EXPORT_SYMBOL(rtnl_unlock);
1390
EXPORT_SYMBOL(rtnl_unicast);
1391 1392
EXPORT_SYMBOL(rtnl_notify);
EXPORT_SYMBOL(rtnl_set_sk_err);
1393 1394
EXPORT_SYMBOL(rtnl_create_link);
EXPORT_SYMBOL(ifla_policy);