1 files changed, 711 insertions, 0 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
new file mode 100644
index 0000000..d69ad90
--- /dev/null
+++ b/net/core/rtnetlink.c
@@ -0,0 +1,711 @@
+/*
+ * 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/config.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/sched.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>
+
+#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>
+
+DECLARE_MUTEX(rtnl_sem);
+
+void rtnl_lock(void)
+{
+	rtnl_shlock();
+}
+
+int rtnl_lock_interruptible(void)
+{
+	return down_interruptible(&rtnl_sem);
+}
+ 
+void rtnl_unlock(void)
+{
+	rtnl_shunlock();
+
+	netdev_run_todo();
+}
+
+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;
+}
+
+struct sock *rtnl;
+
+struct rtnetlink_link * rtnetlink_links[NPROTO];
+
+static const int rtm_min[(RTM_MAX+1-RTM_BASE)/4] =
+{
+	NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+	NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
+	NLMSG_LENGTH(sizeof(struct rtmsg)),
+	NLMSG_LENGTH(sizeof(struct ndmsg)),
+	NLMSG_LENGTH(sizeof(struct rtmsg)),
+	NLMSG_LENGTH(sizeof(struct tcmsg)),
+	NLMSG_LENGTH(sizeof(struct tcmsg)),
+	NLMSG_LENGTH(sizeof(struct tcmsg)),
+	NLMSG_LENGTH(sizeof(struct tcamsg))
+};
+
+static const int rta_max[(RTM_MAX+1-RTM_BASE)/4] =
+{
+	IFLA_MAX,
+	IFA_MAX,
+	RTA_MAX,
+	NDA_MAX,
+	RTA_MAX,
+	TCA_MAX,
+	TCA_MAX,
+	TCA_MAX,
+	TCAA_MAX
+};
+
+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);
+}
+
+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;
+
+	NETLINK_CB(skb).dst_groups = group;
+	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;
+}
+
+int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
+{
+	struct rtattr *mx = (struct rtattr*)skb->tail;
+	int i;
+
+	RTA_PUT(skb, RTA_METRICS, 0, NULL);
+	for (i=0; i<RTAX_MAX; i++) {
+		if (metrics[i])
+			RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
+	}
+	mx->rta_len = skb->tail - (u8*)mx;
+	if (mx->rta_len == RTA_LENGTH(0))
+		skb_trim(skb, (u8*)mx - skb->data);
+	return 0;
+
+rtattr_failure:
+	skb_trim(skb, (u8*)mx - skb->data);
+	return -1;
+}
+
+
+static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
+				 int type, u32 pid, u32 seq, u32 change)
+{
+	struct ifinfomsg *r;
+	struct nlmsghdr  *nlh;
+	unsigned char	 *b = skb->tail;
+
+	nlh = NLMSG_PUT(skb, pid, seq, type, sizeof(*r));
+	if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
+	r = NLMSG_DATA(nlh);
+	r->ifi_family = AF_UNSPEC;
+	r->ifi_type = dev->type;
+	r->ifi_index = dev->ifindex;
+	r->ifi_flags = dev_get_flags(dev);
+	r->ifi_change = change;
+
+	RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
+
+	if (1) {
+		u32 txqlen = dev->tx_queue_len;
+		RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
+	}
+
+	if (1) {
+		u32 weight = dev->weight;
+		RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
+	}
+
+	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,
+		};
+		RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
+	}
+
+	if (dev->addr_len) {
+		RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
+		RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
+	}
+
+	if (1) {
+		u32 mtu = dev->mtu;
+		RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
+	}
+
+	if (dev->ifindex != dev->iflink) {
+		u32 iflink = dev->iflink;
+		RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
+	}
+
+	if (dev->qdisc_sleeping)
+		RTA_PUT(skb, IFLA_QDISC,
+			strlen(dev->qdisc_sleeping->ops->id) + 1,
+			dev->qdisc_sleeping->ops->id);
+	
+	if (dev->master) {
+		u32 master = dev->master->ifindex;
+		RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
+	}
+
+	if (dev->get_stats) {
+		unsigned long *stats = (unsigned long*)dev->get_stats(dev);
+		if (stats) {
+			struct rtattr  *a;
+			__u32	       *s;
+			int		i;
+			int		n = sizeof(struct rtnl_link_stats)/4;
+
+			a = __RTA_PUT(skb, IFLA_STATS, n*4);
+			s = RTA_DATA(a);
+			for (i=0; i<n; i++)
+				s[i] = stats[i];
+		}
+	}
+	nlh->nlmsg_len = skb->tail - b;
+	return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	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;
+		if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, 0) <= 0)
+			break;
+	}
+	read_unlock(&dev_base_lock);
+	cb->args[0] = idx;
+
+	return skb->len;
+}
+
+static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+	struct ifinfomsg  *ifm = NLMSG_DATA(nlh);
+	struct rtattr    **ida = arg;
+	struct net_device *dev;
+	int err, send_addr_notify = 0;
+
+	if (ifm->ifi_index >= 0)
+		dev = dev_get_by_index(ifm->ifi_index);
+	else if (ida[IFLA_IFNAME - 1]) {
+		char ifname[IFNAMSIZ];
+
+		if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
+		                   IFNAMSIZ) >= IFNAMSIZ)
+			return -EINVAL;
+		dev = dev_get_by_name(ifname);
+	} else
+		return -EINVAL;
+
+	if (!dev)
+		return -ENODEV;
+
+	err = -EINVAL;
+
+	if (ifm->ifi_flags)
+		dev_change_flags(dev, ifm->ifi_flags);
+
+	if (ida[IFLA_MAP - 1]) {
+		struct rtnl_link_ifmap *u_map;
+		struct ifmap k_map;
+
+		if (!dev->set_config) {
+			err = -EOPNOTSUPP;
+			goto out;
+		}
+
+		if (!netif_device_present(dev)) {
+			err = -ENODEV;
+			goto out;
+		}
+		
+		if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
+			goto out;
+
+		u_map = RTA_DATA(ida[IFLA_MAP - 1]);
+
+		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);
+
+		if (err)
+			goto out;
+	}
+
+	if (ida[IFLA_ADDRESS - 1]) {
+		if (!dev->set_mac_address) {
+			err = -EOPNOTSUPP;
+			goto out;
+		}
+		if (!netif_device_present(dev)) {
+			err = -ENODEV;
+			goto out;
+		}
+		if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
+			goto out;
+
+		err = dev->set_mac_address(dev, RTA_DATA(ida[IFLA_ADDRESS - 1]));
+		if (err)
+			goto out;
+		send_addr_notify = 1;
+	}
+
+	if (ida[IFLA_BROADCAST - 1]) {
+		if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
+			goto out;
+		memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
+		       dev->addr_len);
+		send_addr_notify = 1;
+	}
+
+	if (ida[IFLA_MTU - 1]) {
+		if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
+			goto out;
+		err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
+
+		if (err)
+			goto out;
+
+	}
+
+	if (ida[IFLA_TXQLEN - 1]) {
+		if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
+			goto out;
+
+		dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
+	}
+
+	if (ida[IFLA_WEIGHT - 1]) {
+		if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
+			goto out;
+
+		dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
+	}
+
+	if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
+		char ifname[IFNAMSIZ];
+
+		if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
+		                   IFNAMSIZ) >= IFNAMSIZ)
+			goto out;
+		err = dev_change_name(dev, ifname);
+		if (err)
+			goto out;
+	}
+
+	err = 0;
+
+out:
+	if (send_addr_notify)
+		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
+
+	dev_put(dev);
+	return err;
+}
+
+static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	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;
+		if (rtnetlink_links[idx] == NULL ||
+		    rtnetlink_links[idx][type].dumpit == NULL)
+			continue;
+		if (idx > s_idx)
+			memset(&cb->args[0], 0, sizeof(cb->args));
+		if (rtnetlink_links[idx][type].dumpit(skb, cb))
+			break;
+	}
+	cb->family = idx;
+
+	return skb->len;
+}
+
+void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
+{
+	struct sk_buff *skb;
+	int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
+			       sizeof(struct rtnl_link_ifmap) +
+			       sizeof(struct rtnl_link_stats) + 128);
+
+	skb = alloc_skb(size, GFP_KERNEL);
+	if (!skb)
+		return;
+
+	if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change) < 0) {
+		kfree_skb(skb);
+		return;
+	}
+	NETLINK_CB(skb).dst_groups = RTMGRP_LINK;
+	netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_KERNEL);
+}
+
+static int rtnetlink_done(struct netlink_callback *cb)
+{
+	return 0;
+}
+
+/* Protected by RTNL sempahore.  */
+static struct rtattr **rta_buf;
+static int rtattr_max;
+
+/* Process one rtnetlink message. */
+
+static __inline__ int
+rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
+{
+	struct rtnetlink_link *link;
+	struct rtnetlink_link *link_tab;
+	int sz_idx, kind;
+	int min_len;
+	int family;
+	int type;
+	int err;
+
+	/* Only requests are handled by kernel now */
+	if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
+		return 0;
+
+	type = nlh->nlmsg_type;
+
+	/* A control message: ignore them */
+	if (type < RTM_BASE)
+		return 0;
+
+	/* Unknown message: reply with EINVAL */
+	if (type > RTM_MAX)
+		goto err_inval;
+
+	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;
+	if (family >= NPROTO) {
+		*errp = -EAFNOSUPPORT;
+		return -1;
+	}
+
+	link_tab = rtnetlink_links[family];
+	if (link_tab == NULL)
+		link_tab = rtnetlink_links[PF_UNSPEC];
+	link = &link_tab[type];
+
+	sz_idx = type>>2;
+	kind = type&3;
+
+	if (kind != 2 && security_netlink_recv(skb)) {
+		*errp = -EPERM;
+		return -1;
+	}
+
+	if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
+		u32 rlen;
+
+		if (link->dumpit == NULL)
+			link = &(rtnetlink_links[PF_UNSPEC][type]);
+
+		if (link->dumpit == NULL)
+			goto err_inval;
+
+		if ((*errp = netlink_dump_start(rtnl, skb, nlh,
+						link->dumpit,
+						rtnetlink_done)) != 0) {
+			return -1;
+		}
+		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+		if (rlen > skb->len)
+			rlen = skb->len;
+		skb_pull(skb, rlen);
+		return -1;
+	}
+
+	memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
+
+	min_len = rtm_min[sz_idx];
+	if (nlh->nlmsg_len < min_len)
+		goto err_inval;
+
+	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])
+					goto err_inval;
+				rta_buf[flavor-1] = attr;
+			}
+			attr = RTA_NEXT(attr, attrlen);
+		}
+	}
+
+	if (link->doit == NULL)
+		link = &(rtnetlink_links[PF_UNSPEC][type]);
+	if (link->doit == NULL)
+		goto err_inval;
+	err = link->doit(skb, nlh, (void *)&rta_buf[0]);
+
+	*errp = err;
+	return err;
+
+err_inval:
+	*errp = -EINVAL;
+	return -1;
+}
+
+/* 
+ * Process one packet of messages.
+ * Malformed skbs with wrong lengths of messages are discarded silently.
+ */
+
+static inline int rtnetlink_rcv_skb(struct sk_buff *skb)
+{
+	int err;
+	struct nlmsghdr * nlh;
+
+	while (skb->len >= NLMSG_SPACE(0)) {
+		u32 rlen;
+
+		nlh = (struct nlmsghdr *)skb->data;
+		if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
+			return 0;
+		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+		if (rlen > skb->len)
+			rlen = skb->len;
+		if (rtnetlink_rcv_msg(skb, nlh, &err)) {
+			/* Not error, but we must interrupt processing here:
+			 *   Note, that in this case we do not pull message
+			 *   from skb, it will be processed later.
+			 */
+			if (err == 0)
+				return -1;
+			netlink_ack(skb, nlh, err);
+		} else if (nlh->nlmsg_flags&NLM_F_ACK)
+			netlink_ack(skb, nlh, 0);
+		skb_pull(skb, rlen);
+	}
+
+	return 0;
+}
+
+/*
+ *  rtnetlink input queue processing routine:
+ *	- try to acquire shared lock. If it is failed, defer processing.
+ *	- feed skbs to rtnetlink_rcv_skb, until it refuse a message,
+ *	  that will occur, when a dump started and/or acquisition of
+ *	  exclusive lock failed.
+ */
+
+static void rtnetlink_rcv(struct sock *sk, int len)
+{
+	do {
+		struct sk_buff *skb;
+
+		if (rtnl_shlock_nowait())
+			return;
+
+		while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+			if (rtnetlink_rcv_skb(skb)) {
+				if (skb->len)
+					skb_queue_head(&sk->sk_receive_queue,
+						       skb);
+				else
+					kfree_skb(skb);
+				break;
+			}
+			kfree_skb(skb);
+		}
+
+		up(&rtnl_sem);
+
+		netdev_run_todo();
+	} while (rtnl && rtnl->sk_receive_queue.qlen);
+}
+
+static struct rtnetlink_link link_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
+{
+	[RTM_GETLINK  - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo },
+	[RTM_SETLINK  - RTM_BASE] = { .doit   = do_setlink	      },
+	[RTM_GETADDR  - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
+	[RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
+	[RTM_NEWNEIGH - RTM_BASE] = { .doit   = neigh_add	      },
+	[RTM_DELNEIGH - RTM_BASE] = { .doit   = neigh_delete	      },
+	[RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info	      }
+};
+
+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");
+
+	rtnl = netlink_kernel_create(NETLINK_ROUTE, rtnetlink_rcv);
+	if (rtnl == NULL)
+		panic("rtnetlink_init: cannot initialize rtnetlink\n");
+	netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
+	register_netdevice_notifier(&rtnetlink_dev_notifier);
+	rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
+	rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
+}
+
+EXPORT_SYMBOL(__rta_fill);
+EXPORT_SYMBOL(rtattr_strlcpy);
+EXPORT_SYMBOL(rtattr_parse);
+EXPORT_SYMBOL(rtnetlink_links);
+EXPORT_SYMBOL(rtnetlink_put_metrics);
+EXPORT_SYMBOL(rtnl);
+EXPORT_SYMBOL(rtnl_lock);
+EXPORT_SYMBOL(rtnl_lock_interruptible);
+EXPORT_SYMBOL(rtnl_sem);
+EXPORT_SYMBOL(rtnl_unlock);