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/major.h>
  26 #include <linux/sched.h>
  27 #include <linux/timer.h>
  28 #include <linux/string.h>
  29 #include <linux/sockios.h>
  30 #include <linux/net.h>
  31 #include <linux/fcntl.h>
  32 #include <linux/mm.h>
  33 #include <linux/slab.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/capability.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/init.h>
  38 #include <linux/security.h>
  39
  40 #include <asm/uaccess.h>
  41 #include <asm/system.h>
  42 #include <asm/string.h>
  43
  44 #include <linux/inet.h>
  45 #include <linux/netdevice.h>
  46 #include <net/ip.h>
  47 #include <net/protocol.h>
  48 #include <net/arp.h>
  49 #include <net/route.h>
  50 #include <net/udp.h>
  51 #include <net/sock.h>
  52 #include <net/pkt_sched.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_MAX+1-RTM_BASE)/4] =
  91 {
  92         NLMSG_LENGTH(sizeof(struct ifinfomsg)),
  93         NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
  94         NLMSG_LENGTH(sizeof(struct rtmsg)),
  95         NLMSG_LENGTH(sizeof(struct ndmsg)),
  96         NLMSG_LENGTH(sizeof(struct rtmsg)),
  97         NLMSG_LENGTH(sizeof(struct tcmsg)),
  98         NLMSG_LENGTH(sizeof(struct tcmsg)),
  99         NLMSG_LENGTH(sizeof(struct tcmsg)),
 100         NLMSG_LENGTH(sizeof(struct tcamsg))
 101 };
 102
 103 static const int rta_max[(RTM_MAX+1-RTM_BASE)/4] =
 104 {
 105         IFLA_MAX,
 106         IFA_MAX,
 107         RTA_MAX,
 108         NDA_MAX,
 109         RTA_MAX,
 110         TCA_MAX,
 111         TCA_MAX,
 112         TCA_MAX,
 113         TCAA_MAX
 114 };
 115
 116 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 117 {
 118         struct rtattr *rta;
 119         int size = RTA_LENGTH(attrlen);
 120
 121         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
 122         rta->rta_type = attrtype;
 123         rta->rta_len = size;
 124         memcpy(RTA_DATA(rta), data, attrlen);
 125 }
 126
 127 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
 128 {
 129         size_t ret = RTA_PAYLOAD(rta);
 130         char *src = RTA_DATA(rta);
 131
 132         if (ret > 0 && src[ret - 1] == '\0')
 133                 ret--;
 134         if (size > 0) {
 135                 size_t len = (ret >= size) ? size - 1 : ret;
 136                 memset(dest, 0, size);
 137                 memcpy(dest, src, len);
 138         }
 139         return ret;
 140 }
 141
 142 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
 143 {
 144         int err = 0;
 145
 146         NETLINK_CB(skb).dst_groups = group;
 147         if (echo)
 148                 atomic_inc(&skb->users);
 149         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 150         if (echo)
 151                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 152         return err;
 153 }
 154
 155 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 156 {
 157         struct rtattr *mx = (struct rtattr*)skb->tail;
 158         int i;
 159
 160         RTA_PUT(skb, RTA_METRICS, 0, NULL);
 161         for (i=0; i<RTAX_MAX; i++) {
 162                 if (metrics[i])
 163                         RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
 164         }
 165         mx->rta_len = skb->tail - (u8*)mx;
 166         if (mx->rta_len == RTA_LENGTH(0))
 167                 skb_trim(skb, (u8*)mx - skb->data);
 168         return 0;
 169
 170 rtattr_failure:
 171         skb_trim(skb, (u8*)mx - skb->data);
 172         return -1;
 173 }
 174
 175
 176 static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 177                                  int type, u32 pid, u32 seq, u32 change)
 178 {
 179         struct ifinfomsg *r;
 180         struct nlmsghdr  *nlh;
 181         unsigned char    *b = skb->tail;
 182
 183         nlh = NLMSG_PUT(skb, pid, seq, type, sizeof(*r));
 184         if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
 185         r = NLMSG_DATA(nlh);
 186         r->ifi_family = AF_UNSPEC;
 187         r->ifi_type = dev->type;
 188         r->ifi_index = dev->ifindex;
 189         r->ifi_flags = dev_get_flags(dev);
 190         r->ifi_change = change;
 191
 192         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
 193
 194         if (1) {
 195                 u32 txqlen = dev->tx_queue_len;
 196                 RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
 197         }
 198
 199         if (1) {
 200                 u32 weight = dev->weight;
 201                 RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
 202         }
 203
 204         if (1) {
 205                 struct rtnl_link_ifmap map = {
 206                         .mem_start   = dev->mem_start,
 207                         .mem_end     = dev->mem_end,
 208                         .base_addr   = dev->base_addr,
 209                         .irq         = dev->irq,
 210                         .dma         = dev->dma,
 211                         .port        = dev->if_port,
 212                 };
 213                 RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 214         }
 215
 216         if (dev->addr_len) {
 217                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 218                 RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 219         }
 220
 221         if (1) {
 222                 u32 mtu = dev->mtu;
 223                 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
 224         }
 225
 226         if (dev->ifindex != dev->iflink) {
 227                 u32 iflink = dev->iflink;
 228                 RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
 229         }
 230
 231         if (dev->qdisc_sleeping)
 232                 RTA_PUT(skb, IFLA_QDISC,
 233                         strlen(dev->qdisc_sleeping->ops->id) + 1,
 234                         dev->qdisc_sleeping->ops->id);
 235
 236         if (dev->master) {
 237                 u32 master = dev->master->ifindex;
 238                 RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
 239         }
 240
 241         if (dev->get_stats) {
 242                 unsigned long *stats = (unsigned long*)dev->get_stats(dev);
 243                 if (stats) {
 244                         struct rtattr  *a;
 245                         __u32          *s;
 246                         int             i;
 247                         int             n = sizeof(struct rtnl_link_stats)/4;
 248
 249                         a = __RTA_PUT(skb, IFLA_STATS, n*4);
 250                         s = RTA_DATA(a);
 251                         for (i=0; i<n; i++)
 252                                 s[i] = stats[i];
 253                 }
 254         }
 255         nlh->nlmsg_len = skb->tail - b;
 256         return skb->len;
 257
 258 nlmsg_failure:
 259 rtattr_failure:
 260         skb_trim(skb, b - skb->data);
 261         return -1;
 262 }
 263
 264 static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 265 {
 266         int idx;
 267         int s_idx = cb->args[0];
 268         struct net_device *dev;
 269
 270         read_lock(&dev_base_lock);
 271         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 272                 if (idx < s_idx)
 273                         continue;
 274                 if (vx_info_flags(skb->sk->sk_vx_info, VXF_HIDE_NETIF, 0) &&
 275                         !dev_in_nx_info(dev, skb->sk->sk_nx_info))
 276                         continue;
 277                 if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, 0) <= 0)
 278                         break;
 279         }
 280         read_unlock(&dev_base_lock);
 281         cb->args[0] = idx;
 282
 283         return skb->len;
 284 }
 285
 286 static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 287 {
 288         struct ifinfomsg  *ifm = NLMSG_DATA(nlh);
 289         struct rtattr    **ida = arg;
 290         struct net_device *dev;
 291         int err, send_addr_notify = 0;
 292
 293         if (ifm->ifi_index >= 0)
 294                 dev = dev_get_by_index(ifm->ifi_index);
 295         else if (ida[IFLA_IFNAME - 1]) {
 296                 char ifname[IFNAMSIZ];
 297
 298                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 299                                    IFNAMSIZ) >= IFNAMSIZ)
 300                         return -EINVAL;
 301                 dev = dev_get_by_name(ifname);
 302         } else
 303                 return -EINVAL;
 304
 305         if (!dev)
 306                 return -ENODEV;
 307
 308         err = -EINVAL;
 309
 310         if (ifm->ifi_flags)
 311                 dev_change_flags(dev, ifm->ifi_flags);
 312
 313         if (ida[IFLA_MAP - 1]) {
 314                 struct rtnl_link_ifmap *u_map;
 315                 struct ifmap k_map;
 316
 317                 if (!dev->set_config) {
 318                         err = -EOPNOTSUPP;
 319                         goto out;
 320                 }
 321
 322                 if (!netif_device_present(dev)) {
 323                         err = -ENODEV;
 324                         goto out;
 325                 }
 326
 327                 if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
 328                         goto out;
 329
 330                 u_map = RTA_DATA(ida[IFLA_MAP - 1]);
 331
 332                 k_map.mem_start = (unsigned long) u_map->mem_start;
 333                 k_map.mem_end = (unsigned long) u_map->mem_end;
 334                 k_map.base_addr = (unsigned short) u_map->base_addr;
 335                 k_map.irq = (unsigned char) u_map->irq;
 336                 k_map.dma = (unsigned char) u_map->dma;
 337                 k_map.port = (unsigned char) u_map->port;
 338
 339                 err = dev->set_config(dev, &k_map);
 340
 341                 if (err)
 342                         goto out;
 343         }
 344
 345         if (ida[IFLA_ADDRESS - 1]) {
 346                 if (!dev->set_mac_address) {
 347                         err = -EOPNOTSUPP;
 348                         goto out;
 349                 }
 350                 if (!netif_device_present(dev)) {
 351                         err = -ENODEV;
 352                         goto out;
 353                 }
 354                 if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 355                         goto out;
 356
 357                 err = dev->set_mac_address(dev, RTA_DATA(ida[IFLA_ADDRESS - 1]));
 358                 if (err)
 359                         goto out;
 360                 send_addr_notify = 1;
 361         }
 362
 363         if (ida[IFLA_BROADCAST - 1]) {
 364                 if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 365                         goto out;
 366                 memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
 367                        dev->addr_len);
 368                 send_addr_notify = 1;
 369         }
 370
 371         if (ida[IFLA_MTU - 1]) {
 372                 if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 373                         goto out;
 374                 err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
 375
 376                 if (err)
 377                         goto out;
 378
 379         }
 380
 381         if (ida[IFLA_TXQLEN - 1]) {
 382                 if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 383                         goto out;
 384
 385                 dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
 386         }
 387
 388         if (ida[IFLA_WEIGHT - 1]) {
 389                 if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 390                         goto out;
 391
 392                 dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
 393         }
 394
 395         if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
 396                 char ifname[IFNAMSIZ];
 397
 398                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 399                                    IFNAMSIZ) >= IFNAMSIZ)
 400                         goto out;
 401                 err = dev_change_name(dev, ifname);
 402                 if (err)
 403                         goto out;
 404         }
 405
 406         err = 0;
 407
 408 out:
 409         if (send_addr_notify)
 410                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 411
 412         dev_put(dev);
 413         return err;
 414 }
 415
 416 static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 417 {
 418         int idx;
 419         int s_idx = cb->family;
 420
 421         if (s_idx == 0)
 422                 s_idx = 1;
 423         for (idx=1; idx<NPROTO; idx++) {
 424                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 425                 if (idx < s_idx || idx == PF_PACKET)
 426                         continue;
 427                 if (rtnetlink_links[idx] == NULL ||
 428                     rtnetlink_links[idx][type].dumpit == NULL)
 429                         continue;
 430                 if (idx > s_idx)
 431                         memset(&cb->args[0], 0, sizeof(cb->args));
 432                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 433                         break;
 434         }
 435         cb->family = idx;
 436
 437         return skb->len;
 438 }
 439
 440 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 441 {
 442         struct sk_buff *skb;
 443         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
 444                                sizeof(struct rtnl_link_ifmap) +
 445                                sizeof(struct rtnl_link_stats) + 128);
 446
 447         if (vx_flags(VXF_HIDE_NETIF, 0) &&
 448                 !dev_in_nx_info(dev, current->nx_info))
 449                 return;
 450         skb = alloc_skb(size, GFP_KERNEL);
 451         if (!skb)
 452                 return;
 453
 454         if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change) < 0) {
 455                 kfree_skb(skb);
 456                 return;
 457         }
 458         NETLINK_CB(skb).dst_groups = RTMGRP_LINK;
 459         netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_KERNEL);
 460 }
 461
 462 static int rtnetlink_done(struct netlink_callback *cb)
 463 {
 464         return 0;
 465 }
 466
 467 /* Protected by RTNL sempahore.  */
 468 static struct rtattr **rta_buf;
 469 static int rtattr_max;
 470
 471 /* Process one rtnetlink message. */
 472
 473 static __inline__ int
 474 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 475 {
 476         struct rtnetlink_link *link;
 477         struct rtnetlink_link *link_tab;
 478         int sz_idx, kind;
 479         int min_len;
 480         int family;
 481         int type;
 482         int err;
 483
 484         /* Only requests are handled by kernel now */
 485         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 486                 return 0;
 487
 488         type = nlh->nlmsg_type;
 489
 490         /* A control message: ignore them */
 491         if (type < RTM_BASE)
 492                 return 0;
 493
 494         /* Unknown message: reply with EINVAL */
 495         if (type > RTM_MAX)
 496                 goto err_inval;
 497
 498         type -= RTM_BASE;
 499
 500         /* All the messages must have at least 1 byte length */
 501         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
 502                 return 0;
 503
 504         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
 505         if (family >= NPROTO) {
 506                 *errp = -EAFNOSUPPORT;
 507                 return -1;
 508         }
 509
 510         link_tab = rtnetlink_links[family];
 511         if (link_tab == NULL)
 512                 link_tab = rtnetlink_links[PF_UNSPEC];
 513         link = &link_tab[type];
 514
 515         sz_idx = type>>2;
 516         kind = type&3;
 517
 518         if (kind != 2 && security_netlink_recv(skb)) {
 519                 *errp = -EPERM;
 520                 return -1;
 521         }
 522
 523         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 524                 u32 rlen;
 525
 526                 if (link->dumpit == NULL)
 527                         link = &(rtnetlink_links[PF_UNSPEC][type]);
 528
 529                 if (link->dumpit == NULL)
 530                         goto err_inval;
 531
 532                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
 533                                                 link->dumpit,
 534                                                 rtnetlink_done)) != 0) {
 535                         return -1;
 536                 }
 537                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
 538                 if (rlen > skb->len)
 539                         rlen = skb->len;
 540                 skb_pull(skb, rlen);
 541                 return -1;
 542         }
 543
 544         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
 545
 546         min_len = rtm_min[sz_idx];
 547         if (nlh->nlmsg_len < min_len)
 548                 goto err_inval;
 549
 550         if (nlh->nlmsg_len > min_len) {
 551                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
 552                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
 553
 554                 while (RTA_OK(attr, attrlen)) {
 555                         unsigned flavor = attr->rta_type;
 556                         if (flavor) {
 557                                 if (flavor > rta_max[sz_idx])
 558                                         goto err_inval;
 559                                 rta_buf[flavor-1] = attr;
 560                         }
 561                         attr = RTA_NEXT(attr, attrlen);
 562                 }
 563         }
 564
 565         if (link->doit == NULL)
 566                 link = &(rtnetlink_links[PF_UNSPEC][type]);
 567         if (link->doit == NULL)
 568                 goto err_inval;
 569         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
 570
 571         *errp = err;
 572         return err;
 573
 574 err_inval:
 575         *errp = -EINVAL;
 576         return -1;
 577 }
 578
 579 /*
 580  * Process one packet of messages.
 581  * Malformed skbs with wrong lengths of messages are discarded silently.
 582  */
 583
 584 static inline int rtnetlink_rcv_skb(struct sk_buff *skb)
 585 {
 586         int err;
 587         struct nlmsghdr * nlh;
 588
 589         while (skb->len >= NLMSG_SPACE(0)) {
 590                 u32 rlen;
 591
 592                 nlh = (struct nlmsghdr *)skb->data;
 593                 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
 594                         return 0;
 595                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
 596                 if (rlen > skb->len)
 597                         rlen = skb->len;
 598                 if (rtnetlink_rcv_msg(skb, nlh, &err)) {
 599                         /* Not error, but we must interrupt processing here:
 600                          *   Note, that in this case we do not pull message
 601                          *   from skb, it will be processed later.
 602                          */
 603                         if (err == 0)
 604                                 return -1;
 605                         netlink_ack(skb, nlh, err);
 606                 } else if (nlh->nlmsg_flags&NLM_F_ACK)
 607                         netlink_ack(skb, nlh, 0);
 608                 skb_pull(skb, rlen);
 609         }
 610
 611         return 0;
 612 }
 613
 614 /*
 615  *  rtnetlink input queue processing routine:
 616  *      - try to acquire shared lock. If it is failed, defer processing.
 617  *      - feed skbs to rtnetlink_rcv_skb, until it refuse a message,
 618  *        that will occur, when a dump started and/or acquisition of
 619  *        exclusive lock failed.
 620  */
 621
 622 static void rtnetlink_rcv(struct sock *sk, int len)
 623 {
 624         do {
 625                 struct sk_buff *skb;
 626
 627                 if (rtnl_shlock_nowait())
 628                         return;
 629
 630                 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 631                         if (rtnetlink_rcv_skb(skb)) {
 632                                 if (skb->len)
 633                                         skb_queue_head(&sk->sk_receive_queue,
 634                                                        skb);
 635                                 else
 636                                         kfree_skb(skb);
 637                                 break;
 638                         }
 639                         kfree_skb(skb);
 640                 }
 641
 642                 up(&rtnl_sem);
 643
 644                 netdev_run_todo();
 645         } while (rtnl && rtnl->sk_receive_queue.qlen);
 646 }
 647
 648 static struct rtnetlink_link link_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
 649 {
 650         [RTM_GETLINK  - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo },
 651         [RTM_SETLINK  - RTM_BASE] = { .doit   = do_setlink            },
 652         [RTM_GETADDR  - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 653         [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 654         [RTM_NEWNEIGH - RTM_BASE] = { .doit   = neigh_add             },
 655         [RTM_DELNEIGH - RTM_BASE] = { .doit   = neigh_delete          },
 656         [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info       }
 657 };
 658
 659 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 660 {
 661         struct net_device *dev = ptr;
 662         switch (event) {
 663         case NETDEV_UNREGISTER:
 664                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 665                 break;
 666         case NETDEV_REGISTER:
 667                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
 668                 break;
 669         case NETDEV_UP:
 670         case NETDEV_DOWN:
 671                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
 672                 break;
 673         case NETDEV_CHANGE:
 674         case NETDEV_GOING_DOWN:
 675                 break;
 676         default:
 677                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 678                 break;
 679         }
 680         return NOTIFY_DONE;
 681 }
 682
 683 static struct notifier_block rtnetlink_dev_notifier = {
 684         .notifier_call  = rtnetlink_event,
 685 };
 686
 687 void __init rtnetlink_init(void)
 688 {
 689         int i;
 690
 691         rtattr_max = 0;
 692         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
 693                 if (rta_max[i] > rtattr_max)
 694                         rtattr_max = rta_max[i];
 695         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
 696         if (!rta_buf)
 697                 panic("rtnetlink_init: cannot allocate rta_buf\n");
 698
 699         rtnl = netlink_kernel_create(NETLINK_ROUTE, rtnetlink_rcv);
 700         if (rtnl == NULL)
 701                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
 702         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
 703         register_netdevice_notifier(&rtnetlink_dev_notifier);
 704         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
 705         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
 706 }
 707
 708 EXPORT_SYMBOL(__rta_fill);
 709 EXPORT_SYMBOL(rtattr_strlcpy);
 710 EXPORT_SYMBOL(rtattr_parse);
 711 EXPORT_SYMBOL(rtnetlink_links);
 712 EXPORT_SYMBOL(rtnetlink_put_metrics);
 713 EXPORT_SYMBOL(rtnl);
 714 EXPORT_SYMBOL(rtnl_lock);
 715 EXPORT_SYMBOL(rtnl_lock_interruptible);
 716 EXPORT_SYMBOL(rtnl_sem);
 717 EXPORT_SYMBOL(rtnl_unlock);