1 files changed, 711 insertions, 0 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
new file mode 100644
index 000000000000..d69ad90e5811
--- /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);