net/core/rtnetlink.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Routing netlink socket interface: protocol independent part.
   7  *
   8  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   9  *
  10  *              This program is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  *
  15  *      Fixes:
  16  *      Vitaly E. Lavrov                RTA_OK arithmetics was wrong.
  17  */
  18
  19 #include <linux/config.h>
  20 #include <linux/errno.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/socket.h>
  24 #include <linux/kernel.h>
  25 #include <linux/sched.h>
  26 #include <linux/timer.h>
  27 #include <linux/string.h>
  28 #include <linux/sockios.h>
  29 #include <linux/net.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/mm.h>
  32 #include <linux/slab.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/capability.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/init.h>
  37 #include <linux/security.h>
  38
  39 #include <asm/uaccess.h>
  40 #include <asm/system.h>
  41 #include <asm/string.h>
  42
  43 #include <linux/inet.h>
  44 #include <linux/netdevice.h>
  45 #include <net/ip.h>
  46 #include <net/protocol.h>
  47 #include <net/arp.h>
  48 #include <net/route.h>
  49 #include <net/udp.h>
  50 #include <net/sock.h>
  51 #include <net/pkt_sched.h>
  52 #include <net/netlink.h>
  53
  54 DECLARE_MUTEX(rtnl_sem);
  55
  56 void rtnl_lock(void)
  57 {
  58         rtnl_shlock();
  59 }
  60
  61 int rtnl_lock_interruptible(void)
  62 {
  63         return down_interruptible(&rtnl_sem);
  64 }
  65
  66 void rtnl_unlock(void)
  67 {
  68         rtnl_shunlock();
  69
  70         netdev_run_todo();
  71 }
  72
  73 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
  74 {
  75         memset(tb, 0, sizeof(struct rtattr*)*maxattr);
  76
  77         while (RTA_OK(rta, len)) {
  78                 unsigned flavor = rta->rta_type;
  79                 if (flavor && flavor <= maxattr)
  80                         tb[flavor-1] = rta;
  81                 rta = RTA_NEXT(rta, len);
  82         }
  83         return 0;
  84 }
  85
  86 struct sock *rtnl;
  87
  88 struct rtnetlink_link * rtnetlink_links[NPROTO];
  89
  90 static const int rtm_min[RTM_NR_FAMILIES] =
  91 {
  92         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
  93         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
  94         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
  95         [RTM_FAM(RTM_NEWNEIGH)]     = NLMSG_LENGTH(sizeof(struct ndmsg)),
  96         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct rtmsg)),
  97         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
  98         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
  99         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
 100         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
 101         [RTM_FAM(RTM_NEWPREFIX)]    = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 102         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 103         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 104         [RTM_FAM(RTM_NEWNEIGHTBL)]  = NLMSG_LENGTH(sizeof(struct ndtmsg)),
 105 };
 106
 107 static const int rta_max[RTM_NR_FAMILIES] =
 108 {
 109         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 110         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 111         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 112         [RTM_FAM(RTM_NEWNEIGH)]     = NDA_MAX,
 113         [RTM_FAM(RTM_NEWRULE)]      = RTA_MAX,
 114         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 115         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 116         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 117         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 118         [RTM_FAM(RTM_NEWNEIGHTBL)]  = NDTA_MAX,
 119 };
 120
 121 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 122 {
 123         struct rtattr *rta;
 124         int size = RTA_LENGTH(attrlen);
 125
 126         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
 127         rta->rta_type = attrtype;
 128         rta->rta_len = size;
 129         memcpy(RTA_DATA(rta), data, attrlen);
 130         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 131 }
 132
 133 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
 134 {
 135         size_t ret = RTA_PAYLOAD(rta);
 136         char *src = RTA_DATA(rta);
 137
 138         if (ret > 0 && src[ret - 1] == '\0')
 139                 ret--;
 140         if (size > 0) {
 141                 size_t len = (ret >= size) ? size - 1 : ret;
 142                 memset(dest, 0, size);
 143                 memcpy(dest, src, len);
 144         }
 145         return ret;
 146 }
 147
 148 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
 149 {
 150         int err = 0;
 151
 152         NETLINK_CB(skb).dst_group = group;
 153         if (echo)
 154                 atomic_inc(&skb->users);
 155         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 156         if (echo)
 157                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 158         return err;
 159 }
 160
 161 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 162 {
 163         struct rtattr *mx = (struct rtattr*)skb->tail;
 164         int i;
 165
 166         RTA_PUT(skb, RTA_METRICS, 0, NULL);
 167         for (i=0; i<RTAX_MAX; i++) {
 168                 if (metrics[i])
 169                         RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
 170         }
 171         mx->rta_len = skb->tail - (u8*)mx;
 172         if (mx->rta_len == RTA_LENGTH(0))
 173                 skb_trim(skb, (u8*)mx - skb->data);
 174         return 0;
 175
 176 rtattr_failure:
 177         skb_trim(skb, (u8*)mx - skb->data);
 178         return -1;
 179 }
 180
 181
 182 static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 183                                  int type, u32 pid, u32 seq, u32 change,
 184                                  unsigned int flags)
 185 {
 186         struct ifinfomsg *r;
 187         struct nlmsghdr  *nlh;
 188         unsigned char    *b = skb->tail;
 189
 190         nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags);
 191         r = NLMSG_DATA(nlh);
 192         r->ifi_family = AF_UNSPEC;
 193         r->__ifi_pad = 0;
 194         r->ifi_type = dev->type;
 195         r->ifi_index = dev->ifindex;
 196         r->ifi_flags = dev_get_flags(dev);
 197         r->ifi_change = change;
 198
 199         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
 200
 201         if (1) {
 202                 u32 txqlen = dev->tx_queue_len;
 203                 RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
 204         }
 205
 206         if (1) {
 207                 u32 weight = dev->weight;
 208                 RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
 209         }
 210
 211         if (1) {
 212                 struct rtnl_link_ifmap map = {
 213                         .mem_start   = dev->mem_start,
 214                         .mem_end     = dev->mem_end,
 215                         .base_addr   = dev->base_addr,
 216                         .irq         = dev->irq,
 217                         .dma         = dev->dma,
 218                         .port        = dev->if_port,
 219                 };
 220                 RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 221         }
 222
 223         if (dev->addr_len) {
 224                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 225                 RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 226         }
 227
 228         if (1) {
 229                 u32 mtu = dev->mtu;
 230                 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
 231         }
 232
 233         if (dev->ifindex != dev->iflink) {
 234                 u32 iflink = dev->iflink;
 235                 RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
 236         }
 237
 238         if (dev->qdisc_sleeping)
 239                 RTA_PUT(skb, IFLA_QDISC,
 240                         strlen(dev->qdisc_sleeping->ops->id) + 1,
 241                         dev->qdisc_sleeping->ops->id);
 242
 243         if (dev->master) {
 244                 u32 master = dev->master->ifindex;
 245                 RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
 246         }
 247
 248         if (dev->get_stats) {
 249                 unsigned long *stats = (unsigned long*)dev->get_stats(dev);
 250                 if (stats) {
 251                         struct rtattr  *a;
 252                         __u32          *s;
 253                         int             i;
 254                         int             n = sizeof(struct rtnl_link_stats)/4;
 255
 256                         a = __RTA_PUT(skb, IFLA_STATS, n*4);
 257                         s = RTA_DATA(a);
 258                         for (i=0; i<n; i++)
 259                                 s[i] = stats[i];
 260                 }
 261         }
 262         nlh->nlmsg_len = skb->tail - b;
 263         return skb->len;
 264
 265 nlmsg_failure:
 266 rtattr_failure:
 267         skb_trim(skb, b - skb->data);
 268         return -1;
 269 }
 270
 271 static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 272 {
 273         int idx;
 274         int s_idx = cb->args[0];
 275         struct net_device *dev;
 276
 277         read_lock(&dev_base_lock);
 278         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 279                 if (idx < s_idx)
 280                         continue;
 281                 if (vx_info_flags(skb->sk->sk_vx_info, VXF_HIDE_NETIF, 0) &&
 282                         !dev_in_nx_info(dev, skb->sk->sk_nx_info))
 283                         continue;
 284                 if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK,
 285                                           NETLINK_CB(cb->skb).pid,
 286                                           cb->nlh->nlmsg_seq, 0,
 287                                           NLM_F_MULTI) <= 0)
 288                         break;
 289         }
 290         read_unlock(&dev_base_lock);
 291         cb->args[0] = idx;
 292
 293         return skb->len;
 294 }
 295
 296 static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 297 {
 298         struct ifinfomsg  *ifm = NLMSG_DATA(nlh);
 299         struct rtattr    **ida = arg;
 300         struct net_device *dev;
 301         int err, send_addr_notify = 0;
 302
 303         if (ifm->ifi_index >= 0)
 304                 dev = dev_get_by_index(ifm->ifi_index);
 305         else if (ida[IFLA_IFNAME - 1]) {
 306                 char ifname[IFNAMSIZ];
 307
 308                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 309                                    IFNAMSIZ) >= IFNAMSIZ)
 310                         return -EINVAL;
 311                 dev = dev_get_by_name(ifname);
 312         } else
 313                 return -EINVAL;
 314
 315         if (!dev)
 316                 return -ENODEV;
 317
 318         err = -EINVAL;
 319
 320         if (ifm->ifi_flags)
 321                 dev_change_flags(dev, ifm->ifi_flags);
 322
 323         if (ida[IFLA_MAP - 1]) {
 324                 struct rtnl_link_ifmap *u_map;
 325                 struct ifmap k_map;
 326
 327                 if (!dev->set_config) {
 328                         err = -EOPNOTSUPP;
 329                         goto out;
 330                 }
 331
 332                 if (!netif_device_present(dev)) {
 333                         err = -ENODEV;
 334                         goto out;
 335                 }
 336
 337                 if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
 338                         goto out;
 339
 340                 u_map = RTA_DATA(ida[IFLA_MAP - 1]);
 341
 342                 k_map.mem_start = (unsigned long) u_map->mem_start;
 343                 k_map.mem_end = (unsigned long) u_map->mem_end;
 344                 k_map.base_addr = (unsigned short) u_map->base_addr;
 345                 k_map.irq = (unsigned char) u_map->irq;
 346                 k_map.dma = (unsigned char) u_map->dma;
 347                 k_map.port = (unsigned char) u_map->port;
 348
 349                 err = dev->set_config(dev, &k_map);
 350
 351                 if (err)
 352                         goto out;
 353         }
 354
 355         if (ida[IFLA_ADDRESS - 1]) {
 356                 struct sockaddr *sa;
 357                 int len;
 358
 359                 if (!dev->set_mac_address) {
 360                         err = -EOPNOTSUPP;
 361                         goto out;
 362                 }
 363                 if (!netif_device_present(dev)) {
 364                         err = -ENODEV;
 365                         goto out;
 366                 }
 367                 if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 368                         goto out;
 369
 370                 len = sizeof(sa_family_t) + dev->addr_len;
 371                 sa = kmalloc(len, GFP_KERNEL);
 372                 if (!sa) {
 373                         err = -ENOMEM;
 374                         goto out;
 375                 }
 376                 sa->sa_family = dev->type;
 377                 memcpy(sa->sa_data, RTA_DATA(ida[IFLA_ADDRESS - 1]),
 378                        dev->addr_len);
 379                 err = dev->set_mac_address(dev, sa);
 380                 kfree(sa);
 381                 if (err)
 382                         goto out;
 383                 send_addr_notify = 1;
 384         }
 385
 386         if (ida[IFLA_BROADCAST - 1]) {
 387                 if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 388                         goto out;
 389                 memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
 390                        dev->addr_len);
 391                 send_addr_notify = 1;
 392         }
 393
 394         if (ida[IFLA_MTU - 1]) {
 395                 if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 396                         goto out;
 397                 err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
 398
 399                 if (err)
 400                         goto out;
 401
 402         }
 403
 404         if (ida[IFLA_TXQLEN - 1]) {
 405                 if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 406                         goto out;
 407
 408                 dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
 409         }
 410
 411         if (ida[IFLA_WEIGHT - 1]) {
 412                 if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 413                         goto out;
 414
 415                 dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
 416         }
 417
 418         if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
 419                 char ifname[IFNAMSIZ];
 420
 421                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 422                                    IFNAMSIZ) >= IFNAMSIZ)
 423                         goto out;
 424                 err = dev_change_name(dev, ifname);
 425                 if (err)
 426                         goto out;
 427         }
 428
 429         err = 0;
 430
 431 out:
 432         if (send_addr_notify)
 433                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 434
 435         dev_put(dev);
 436         return err;
 437 }
 438
 439 static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 440 {
 441         int idx;
 442         int s_idx = cb->family;
 443
 444         if (s_idx == 0)
 445                 s_idx = 1;
 446         for (idx=1; idx<NPROTO; idx++) {
 447                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 448                 if (idx < s_idx || idx == PF_PACKET)
 449                         continue;
 450                 if (rtnetlink_links[idx] == NULL ||
 451                     rtnetlink_links[idx][type].dumpit == NULL)
 452                         continue;
 453                 if (idx > s_idx)
 454                         memset(&cb->args[0], 0, sizeof(cb->args));
 455                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 456                         break;
 457         }
 458         cb->family = idx;
 459
 460         return skb->len;
 461 }
 462
 463 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 464 {
 465         struct sk_buff *skb;
 466         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
 467                                sizeof(struct rtnl_link_ifmap) +
 468                                sizeof(struct rtnl_link_stats) + 128);
 469
 470         if (vx_flags(VXF_HIDE_NETIF, 0) &&
 471                 !dev_in_nx_info(dev, current->nx_info))
 472                 return;
 473         skb = alloc_skb(size, GFP_KERNEL);
 474         if (!skb)
 475                 return;
 476
 477         if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) {
 478                 kfree_skb(skb);
 479                 return;
 480         }
 481         NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
 482         netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
 483 }
 484
 485 /* Protected by RTNL sempahore.  */
 486 static struct rtattr **rta_buf;
 487 static int rtattr_max;
 488
 489 /* Process one rtnetlink message. */
 490
 491 static __inline__ int
 492 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 493 {
 494         struct rtnetlink_link *link;
 495         struct rtnetlink_link *link_tab;
 496         int sz_idx, kind;
 497         int min_len;
 498         int family;
 499         int type;
 500         int err;
 501
 502         /* Only requests are handled by kernel now */
 503         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 504                 return 0;
 505
 506         type = nlh->nlmsg_type;
 507
 508         /* A control message: ignore them */
 509         if (type < RTM_BASE)
 510                 return 0;
 511
 512         /* Unknown message: reply with EINVAL */
 513         if (type > RTM_MAX)
 514                 goto err_inval;
 515
 516         type -= RTM_BASE;
 517
 518         /* All the messages must have at least 1 byte length */
 519         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
 520                 return 0;
 521
 522         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
 523         if (family >= NPROTO) {
 524                 *errp = -EAFNOSUPPORT;
 525                 return -1;
 526         }
 527
 528         link_tab = rtnetlink_links[family];
 529         if (link_tab == NULL)
 530                 link_tab = rtnetlink_links[PF_UNSPEC];
 531         link = &link_tab[type];
 532
 533         sz_idx = type>>2;
 534         kind = type&3;
 535
 536         if (kind != 2 && security_netlink_recv(skb)) {
 537                 *errp = -EPERM;
 538                 return -1;
 539         }
 540
 541         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 542                 if (link->dumpit == NULL)
 543                         link = &(rtnetlink_links[PF_UNSPEC][type]);
 544
 545                 if (link->dumpit == NULL)
 546                         goto err_inval;
 547
 548                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
 549                                                 link->dumpit, NULL)) != 0) {
 550                         return -1;
 551                 }
 552
 553                 netlink_queue_skip(nlh, skb);
 554                 return -1;
 555         }
 556
 557         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
 558
 559         min_len = rtm_min[sz_idx];
 560         if (nlh->nlmsg_len < min_len)
 561                 goto err_inval;
 562
 563         if (nlh->nlmsg_len > min_len) {
 564                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
 565                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
 566
 567                 while (RTA_OK(attr, attrlen)) {
 568                         unsigned flavor = attr->rta_type;
 569                         if (flavor) {
 570                                 if (flavor > rta_max[sz_idx])
 571                                         goto err_inval;
 572                                 rta_buf[flavor-1] = attr;
 573                         }
 574                         attr = RTA_NEXT(attr, attrlen);
 575                 }
 576         }
 577
 578         if (link->doit == NULL)
 579                 link = &(rtnetlink_links[PF_UNSPEC][type]);
 580         if (link->doit == NULL)
 581                 goto err_inval;
 582         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
 583
 584         *errp = err;
 585         return err;
 586
 587 err_inval:
 588         *errp = -EINVAL;
 589         return -1;
 590 }
 591
 592 static void rtnetlink_rcv(struct sock *sk, int len)
 593 {
 594         unsigned int qlen = 0;
 595
 596         do {
 597                 rtnl_lock();
 598                 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
 599                 up(&rtnl_sem);
 600
 601                 netdev_run_todo();
 602         } while (qlen);
 603 }
 604
 605 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 606 {
 607         [RTM_GETLINK     - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo },
 608         [RTM_SETLINK     - RTM_BASE] = { .doit   = do_setlink            },
 609         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 610         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 611         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
 612         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
 613         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
 614         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 615         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
 616         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
 617 };
 618
 619 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 620 {
 621         struct net_device *dev = ptr;
 622         switch (event) {
 623         case NETDEV_UNREGISTER:
 624                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 625                 break;
 626         case NETDEV_REGISTER:
 627                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
 628                 break;
 629         case NETDEV_UP:
 630         case NETDEV_DOWN:
 631                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
 632                 break;
 633         case NETDEV_CHANGE:
 634         case NETDEV_GOING_DOWN:
 635                 break;
 636         default:
 637                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 638                 break;
 639         }
 640         return NOTIFY_DONE;
 641 }
 642
 643 static struct notifier_block rtnetlink_dev_notifier = {
 644         .notifier_call  = rtnetlink_event,
 645 };
 646
 647 void __init rtnetlink_init(void)
 648 {
 649         int i;
 650
 651         rtattr_max = 0;
 652         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
 653                 if (rta_max[i] > rtattr_max)
 654                         rtattr_max = rta_max[i];
 655         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
 656         if (!rta_buf)
 657                 panic("rtnetlink_init: cannot allocate rta_buf\n");
 658
 659         rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
 660                                      THIS_MODULE);
 661         if (rtnl == NULL)
 662                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
 663         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
 664         register_netdevice_notifier(&rtnetlink_dev_notifier);
 665         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
 666         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
 667 }
 668
 669 EXPORT_SYMBOL(__rta_fill);
 670 EXPORT_SYMBOL(rtattr_strlcpy);
 671 EXPORT_SYMBOL(rtattr_parse);
 672 EXPORT_SYMBOL(rtnetlink_links);
 673 EXPORT_SYMBOL(rtnetlink_put_metrics);
 674 EXPORT_SYMBOL(rtnl);
 675 EXPORT_SYMBOL(rtnl_lock);
 676 EXPORT_SYMBOL(rtnl_lock_interruptible);
 677 EXPORT_SYMBOL(rtnl_sem);
 678 EXPORT_SYMBOL(rtnl_unlock);