rtnetlink.c 24.3 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 <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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#ifdef CONFIG_NET_WIRELESS_RTNETLINK
#include <linux/wireless.h>
#include <net/iw_handler.h>
#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */
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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);
	if (rtnl && rtnl->sk_receive_queue.qlen)
		rtnl->sk_data_ready(rtnl, 0);
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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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struct rtnl_link *rtnl_msg_handlers[NPROTO];

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 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;
	};

	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(int iwbuflen)
{
	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 */
	       + nla_total_size(1) /* IFLA_LINKMODE */
	       + nla_total_size(iwbuflen);
}

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static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
			    void *iwbuf, int iwbuflen, int type, u32 pid,
			    u32 seq, u32 change, unsigned int flags)
{
	struct ifinfomsg *ifm;
	struct nlmsghdr *nlh;
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	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
	if (nlh == NULL)
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		return -EMSGSIZE;
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	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_U32(skb, IFLA_WEIGHT, dev->weight);
	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);
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	if (dev->qdisc_sleeping)
		NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
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	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,
		};
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		NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
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	}

	if (dev->addr_len) {
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		NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
		NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
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	}

	if (dev->get_stats) {
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		struct net_device_stats *stats = dev->get_stats(dev);
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		if (stats) {
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			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);
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		}
	}

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	if (iwbuf)
		NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);

	return nlmsg_end(skb, nlh);

nla_put_failure:
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	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
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}

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static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
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{
	int idx;
	int s_idx = cb->args[0];
	struct net_device *dev;

	read_lock(&dev_base_lock);
	for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
		if (idx < s_idx)
			continue;
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		if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
				     NETLINK_CB(cb->skb).pid,
				     cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
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			break;
	}
	read_unlock(&dev_base_lock);
	cb->args[0] = idx;

	return skb->len;
}

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static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
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	[IFLA_IFNAME]		= { .type = NLA_STRING, .len = IFNAMSIZ-1 },
	[IFLA_MAP]		= { .len = sizeof(struct rtnl_link_ifmap) },
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	[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 },
};

static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
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{
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	struct ifinfomsg *ifm;
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	struct net_device *dev;
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	int err, send_addr_notify = 0, modified = 0;
	struct nlattr *tb[IFLA_MAX+1];
	char ifname[IFNAMSIZ];
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	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
	if (err < 0)
		goto errout;

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	if (tb[IFLA_IFNAME])
		nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
585 586
	else
		ifname[0] = '\0';
587 588 589

	err = -EINVAL;
	ifm = nlmsg_data(nlh);
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	if (ifm->ifi_index >= 0)
		dev = dev_get_by_index(ifm->ifi_index);
592
	else if (tb[IFLA_IFNAME])
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		dev = dev_get_by_name(ifname);
594 595
	else
		goto errout;
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597 598 599 600
	if (dev == NULL) {
		err = -ENODEV;
		goto errout;
	}
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602 603 604
	if (tb[IFLA_ADDRESS] &&
	    nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
		goto errout_dev;
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605

606 607 608
	if (tb[IFLA_BROADCAST] &&
	    nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
		goto errout_dev;
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609

610
	if (tb[IFLA_MAP]) {
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		struct rtnl_link_ifmap *u_map;
		struct ifmap k_map;

		if (!dev->set_config) {
			err = -EOPNOTSUPP;
616
			goto errout_dev;
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		}

		if (!netif_device_present(dev)) {
			err = -ENODEV;
621
			goto errout_dev;
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		}

624
		u_map = nla_data(tb[IFLA_MAP]);
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		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);
633 634
		if (err < 0)
			goto errout_dev;
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636
		modified = 1;
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	}

639
	if (tb[IFLA_ADDRESS]) {
640 641 642
		struct sockaddr *sa;
		int len;

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		if (!dev->set_mac_address) {
			err = -EOPNOTSUPP;
645
			goto errout_dev;
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646
		}
647

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648 649
		if (!netif_device_present(dev)) {
			err = -ENODEV;
650
			goto errout_dev;
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		}

653 654 655 656
		len = sizeof(sa_family_t) + dev->addr_len;
		sa = kmalloc(len, GFP_KERNEL);
		if (!sa) {
			err = -ENOMEM;
657
			goto errout_dev;
658 659
		}
		sa->sa_family = dev->type;
660
		memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
661 662 663
		       dev->addr_len);
		err = dev->set_mac_address(dev, sa);
		kfree(sa);
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		if (err)
665
			goto errout_dev;
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666
		send_addr_notify = 1;
667
		modified = 1;
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	}

670 671 672 673 674
	if (tb[IFLA_MTU]) {
		err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
		if (err < 0)
			goto errout_dev;
		modified = 1;
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	}

677 678 679 680 681 682 683 684 685 686
	/*
	 * Interface selected by interface index but interface
	 * name provided implies that a name change has been
	 * requested.
	 */
	if (ifm->ifi_index >= 0 && ifname[0]) {
		err = dev_change_name(dev, ifname);
		if (err < 0)
			goto errout_dev;
		modified = 1;
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	}

689 690 691 692 693 694 695 696 697 698
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
	if (tb[IFLA_WIRELESS]) {
		/* Call Wireless Extensions.
		 * Various stuff checked in there... */
		err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
					     nla_len(tb[IFLA_WIRELESS]));
		if (err < 0)
			goto errout_dev;
	}
#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */
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700 701 702
	if (tb[IFLA_BROADCAST]) {
		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
		send_addr_notify = 1;
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	}


706 707
	if (ifm->ifi_flags)
		dev_change_flags(dev, ifm->ifi_flags);
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709 710
	if (tb[IFLA_TXQLEN])
		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
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712 713
	if (tb[IFLA_WEIGHT])
		dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
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715 716
	if (tb[IFLA_OPERSTATE])
		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
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718
	if (tb[IFLA_LINKMODE]) {
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719
		write_lock_bh(&dev_base_lock);
720
		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
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		write_unlock_bh(&dev_base_lock);
	}

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	err = 0;

726 727 728 729 730 731 732
errout_dev:
	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);

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	if (send_addr_notify)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);

	dev_put(dev);
737
errout:
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	return err;
}

741
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
742
{
743 744 745 746 747
	struct ifinfomsg *ifm;
	struct nlattr *tb[IFLA_MAX+1];
	struct net_device *dev = NULL;
	struct sk_buff *nskb;
	char *iw_buf = NULL, *iw = NULL;
748
	int iw_buf_len = 0;
749
	int err;
750

751 752
	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
	if (err < 0)
753
		return err;
754 755 756

	ifm = nlmsg_data(nlh);
	if (ifm->ifi_index >= 0) {
757
		dev = dev_get_by_index(ifm->ifi_index);
758 759 760
		if (dev == NULL)
			return -ENODEV;
	} else
761 762 763
		return -EINVAL;


764 765
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
	if (tb[IFLA_WIRELESS]) {
766 767
		/* Call Wireless Extensions. We need to know the size before
		 * we can alloc. Various stuff checked in there... */
768 769 770 771 772 773
		err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
					     nla_len(tb[IFLA_WIRELESS]),
					     &iw_buf, &iw_buf_len);
		if (err < 0)
			goto errout;

774 775
		/* Payload is at an offset in buffer */
		iw = iw_buf + IW_EV_POINT_OFF;
776 777 778
	}
#endif	/* CONFIG_NET_WIRELESS_RTNETLINK */

779
	nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL);
780 781 782 783 784 785 786
	if (nskb == NULL) {
		err = -ENOBUFS;
		goto errout;
	}

	err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
			       NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
787 788 789 790 791 792
	if (err < 0) {
		/* -EMSGSIZE implies BUG in if_nlmsg_size */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(nskb);
		goto errout;
	}
793
	err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
794 795
errout:
	kfree(iw_buf);
796 797
	dev_put(dev);

798
	return err;
799 800
}

801
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;
812 813
		if (rtnl_msg_handlers[idx] == NULL ||
		    rtnl_msg_handlers[idx][type].dumpit == NULL)
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			continue;
		if (idx > s_idx)
			memset(&cb->args[0], 0, sizeof(cb->args));
817
		if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
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			break;
	}
	cb->family = idx;

	return skb->len;
}

825 826
EXPORT_SYMBOL_GPL(rtnl_dump_all);

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void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
{
	struct sk_buff *skb;
830
	int err = -ENOBUFS;
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832
	skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL);
833 834
	if (skb == NULL)
		goto errout;
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836
	err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
837 838 839 840 841 842
	if (err < 0) {
		/* -EMSGSIZE implies BUG in if_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
843 844 845 846
	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. */

855
static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
857
	rtnl_doit_func doit;
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	int sz_idx, kind;
	int min_len;
	int family;
	int type;

	type = nlh->nlmsg_type;
	if (type > RTM_MAX)
865
		return -EINVAL;
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	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;
874 875
	if (family >= NPROTO)
		return -EAFNOSUPPORT;
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	sz_idx = type>>2;
	kind = type&3;

880 881
	if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
		return -EPERM;
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	if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
884
		rtnl_dumpit_func dumpit;
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885

886 887
		dumpit = rtnl_get_dumpit(family, type);
		if (dumpit == NULL)
888
			return -EINVAL;
889

890
		return netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
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	}

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

	min_len = rtm_min[sz_idx];
	if (nlh->nlmsg_len < min_len)
897
		return -EINVAL;
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	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])
907
					return -EINVAL;
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908 909 910 911 912 913
				rta_buf[flavor-1] = attr;
			}
			attr = RTA_NEXT(attr, attrlen);
		}
	}

914 915
	doit = rtnl_get_doit(family, type);
	if (doit == NULL)
916
		return -EINVAL;
L
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917

918
	return doit(skb, nlh, (void *)&rta_buf[0]);
L
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919 920 921 922
}

static void rtnetlink_rcv(struct sock *sk, int len)
{
923
	unsigned int qlen = 0;
924

L
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925
	do {
926
		mutex_lock(&rtnl_mutex);
927
		netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
928
		mutex_unlock(&rtnl_mutex);
L
Linus Torvalds 已提交
929 930

		netdev_run_todo();
931
	} while (qlen);
L
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932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
}

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

974
	rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
975
				     THIS_MODULE);
L
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976 977 978 979
	if (rtnl == NULL)
		panic("rtnetlink_init: cannot initialize rtnetlink\n");
	netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
	register_netdevice_notifier(&rtnetlink_dev_notifier);
980 981 982

	rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
	rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
983 984 985

	rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
	rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
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986 987 988 989 990 991 992
}

EXPORT_SYMBOL(__rta_fill);
EXPORT_SYMBOL(rtattr_strlcpy);
EXPORT_SYMBOL(rtattr_parse);
EXPORT_SYMBOL(rtnetlink_put_metrics);
EXPORT_SYMBOL(rtnl_lock);
993
EXPORT_SYMBOL(rtnl_trylock);
L
Linus Torvalds 已提交
994
EXPORT_SYMBOL(rtnl_unlock);
995
EXPORT_SYMBOL(rtnl_unicast);
996 997
EXPORT_SYMBOL(rtnl_notify);
EXPORT_SYMBOL(rtnl_set_sk_err);