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 void set_operstate(struct net_device *dev, unsigned char transition)
 183 {
 184         unsigned char operstate = dev->operstate;
 185
 186         switch(transition) {
 187         case IF_OPER_UP:
 188                 if ((operstate == IF_OPER_DORMANT ||
 189                      operstate == IF_OPER_UNKNOWN) &&
 190                     !netif_dormant(dev))
 191                         operstate = IF_OPER_UP;
 192                 break;
 193
 194         case IF_OPER_DORMANT:
 195                 if (operstate == IF_OPER_UP ||
 196                     operstate == IF_OPER_UNKNOWN)
 197                         operstate = IF_OPER_DORMANT;
 198                 break;
 199         };
 200
 201         if (dev->operstate != operstate) {
 202                 write_lock_bh(&dev_base_lock);
 203                 dev->operstate = operstate;
 204                 write_unlock_bh(&dev_base_lock);
 205                 netdev_state_change(dev);
 206         }
 207 }
 208
 209 static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 210                                  int type, u32 pid, u32 seq, u32 change,
 211                                  unsigned int flags)
 212 {
 213         struct ifinfomsg *r;
 214         struct nlmsghdr  *nlh;
 215         unsigned char    *b = skb->tail;
 216
 217         nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags);
 218         r = NLMSG_DATA(nlh);
 219         r->ifi_family = AF_UNSPEC;
 220         r->__ifi_pad = 0;
 221         r->ifi_type = dev->type;
 222         r->ifi_index = dev->ifindex;
 223         r->ifi_flags = dev_get_flags(dev);
 224         r->ifi_change = change;
 225
 226         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
 227
 228         if (1) {
 229                 u32 txqlen = dev->tx_queue_len;
 230                 RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
 231         }
 232
 233         if (1) {
 234                 u32 weight = dev->weight;
 235                 RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
 236         }
 237
 238         if (1) {
 239                 u8 operstate = netif_running(dev)?dev->operstate:IF_OPER_DOWN;
 240                 u8 link_mode = dev->link_mode;
 241                 RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate);
 242                 RTA_PUT(skb, IFLA_LINKMODE, sizeof(link_mode), &link_mode);
 243         }
 244
 245         if (1) {
 246                 struct rtnl_link_ifmap map = {
 247                         .mem_start   = dev->mem_start,
 248                         .mem_end     = dev->mem_end,
 249                         .base_addr   = dev->base_addr,
 250                         .irq         = dev->irq,
 251                         .dma         = dev->dma,
 252                         .port        = dev->if_port,
 253                 };
 254                 RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 255         }
 256
 257         if (dev->addr_len) {
 258                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 259                 RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 260         }
 261
 262         if (1) {
 263                 u32 mtu = dev->mtu;
 264                 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
 265         }
 266
 267         if (dev->ifindex != dev->iflink) {
 268                 u32 iflink = dev->iflink;
 269                 RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
 270         }
 271
 272         if (dev->qdisc_sleeping)
 273                 RTA_PUT(skb, IFLA_QDISC,
 274                         strlen(dev->qdisc_sleeping->ops->id) + 1,
 275                         dev->qdisc_sleeping->ops->id);
 276
 277         if (dev->master) {
 278                 u32 master = dev->master->ifindex;
 279                 RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
 280         }
 281
 282         if (dev->get_stats) {
 283                 unsigned long *stats = (unsigned long*)dev->get_stats(dev);
 284                 if (stats) {
 285                         struct rtattr  *a;
 286                         __u32          *s;
 287                         int             i;
 288                         int             n = sizeof(struct rtnl_link_stats)/4;
 289
 290                         a = __RTA_PUT(skb, IFLA_STATS, n*4);
 291                         s = RTA_DATA(a);
 292                         for (i=0; i<n; i++)
 293                                 s[i] = stats[i];
 294                 }
 295         }
 296         nlh->nlmsg_len = skb->tail - b;
 297         return skb->len;
 298
 299 nlmsg_failure:
 300 rtattr_failure:
 301         skb_trim(skb, b - skb->data);
 302         return -1;
 303 }
 304
 305 static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 306 {
 307         int idx;
 308         int s_idx = cb->args[0];
 309         struct net_device *dev;
 310
 311         read_lock(&dev_base_lock);
 312         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 313                 if (idx < s_idx)
 314                         continue;
 315                 if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK,
 316                                           NETLINK_CB(cb->skb).pid,
 317                                           cb->nlh->nlmsg_seq, 0,
 318                                           NLM_F_MULTI) <= 0)
 319                         break;
 320         }
 321         read_unlock(&dev_base_lock);
 322         cb->args[0] = idx;
 323
 324         return skb->len;
 325 }
 326
 327 static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 328 {
 329         struct ifinfomsg  *ifm = NLMSG_DATA(nlh);
 330         struct rtattr    **ida = arg;
 331         struct net_device *dev;
 332         int err, send_addr_notify = 0;
 333
 334         if (ifm->ifi_index >= 0)
 335                 dev = dev_get_by_index(ifm->ifi_index);
 336         else if (ida[IFLA_IFNAME - 1]) {
 337                 char ifname[IFNAMSIZ];
 338
 339                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 340                                    IFNAMSIZ) >= IFNAMSIZ)
 341                         return -EINVAL;
 342                 dev = dev_get_by_name(ifname);
 343         } else
 344                 return -EINVAL;
 345
 346         if (!dev)
 347                 return -ENODEV;
 348
 349         err = -EINVAL;
 350
 351         if (ifm->ifi_flags)
 352                 dev_change_flags(dev, ifm->ifi_flags);
 353
 354         if (ida[IFLA_MAP - 1]) {
 355                 struct rtnl_link_ifmap *u_map;
 356                 struct ifmap k_map;
 357
 358                 if (!dev->set_config) {
 359                         err = -EOPNOTSUPP;
 360                         goto out;
 361                 }
 362
 363                 if (!netif_device_present(dev)) {
 364                         err = -ENODEV;
 365                         goto out;
 366                 }
 367
 368                 if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
 369                         goto out;
 370
 371                 u_map = RTA_DATA(ida[IFLA_MAP - 1]);
 372
 373                 k_map.mem_start = (unsigned long) u_map->mem_start;
 374                 k_map.mem_end = (unsigned long) u_map->mem_end;
 375                 k_map.base_addr = (unsigned short) u_map->base_addr;
 376                 k_map.irq = (unsigned char) u_map->irq;
 377                 k_map.dma = (unsigned char) u_map->dma;
 378                 k_map.port = (unsigned char) u_map->port;
 379
 380                 err = dev->set_config(dev, &k_map);
 381
 382                 if (err)
 383                         goto out;
 384         }
 385
 386         if (ida[IFLA_ADDRESS - 1]) {
 387                 if (!dev->set_mac_address) {
 388                         err = -EOPNOTSUPP;
 389                         goto out;
 390                 }
 391                 if (!netif_device_present(dev)) {
 392                         err = -ENODEV;
 393                         goto out;
 394                 }
 395                 if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 396                         goto out;
 397
 398                 err = dev->set_mac_address(dev, RTA_DATA(ida[IFLA_ADDRESS - 1]));
 399                 if (err)
 400                         goto out;
 401                 send_addr_notify = 1;
 402         }
 403
 404         if (ida[IFLA_BROADCAST - 1]) {
 405                 if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 406                         goto out;
 407                 memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
 408                        dev->addr_len);
 409                 send_addr_notify = 1;
 410         }
 411
 412         if (ida[IFLA_MTU - 1]) {
 413                 if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 414                         goto out;
 415                 err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
 416
 417                 if (err)
 418                         goto out;
 419
 420         }
 421
 422         if (ida[IFLA_TXQLEN - 1]) {
 423                 if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 424                         goto out;
 425
 426                 dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
 427         }
 428
 429         if (ida[IFLA_WEIGHT - 1]) {
 430                 if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 431                         goto out;
 432
 433                 dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
 434         }
 435
 436         if (ida[IFLA_OPERSTATE - 1]) {
 437                 if (ida[IFLA_OPERSTATE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
 438                         goto out;
 439
 440                 set_operstate(dev, *((u8 *) RTA_DATA(ida[IFLA_OPERSTATE - 1])));
 441         }
 442
 443         if (ida[IFLA_LINKMODE - 1]) {
 444                 if (ida[IFLA_LINKMODE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
 445                         goto out;
 446
 447                 write_lock_bh(&dev_base_lock);
 448                 dev->link_mode = *((u8 *) RTA_DATA(ida[IFLA_LINKMODE - 1]));
 449                 write_unlock_bh(&dev_base_lock);
 450         }
 451
 452         if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
 453                 char ifname[IFNAMSIZ];
 454
 455                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 456                                    IFNAMSIZ) >= IFNAMSIZ)
 457                         goto out;
 458                 err = dev_change_name(dev, ifname);
 459                 if (err)
 460                         goto out;
 461         }
 462
 463         err = 0;
 464
 465 out:
 466         if (send_addr_notify)
 467                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 468
 469         dev_put(dev);
 470         return err;
 471 }
 472
 473 static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 474 {
 475         int idx;
 476         int s_idx = cb->family;
 477
 478         if (s_idx == 0)
 479                 s_idx = 1;
 480         for (idx=1; idx<NPROTO; idx++) {
 481                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 482                 if (idx < s_idx || idx == PF_PACKET)
 483                         continue;
 484                 if (rtnetlink_links[idx] == NULL ||
 485                     rtnetlink_links[idx][type].dumpit == NULL)
 486                         continue;
 487                 if (idx > s_idx)
 488                         memset(&cb->args[0], 0, sizeof(cb->args));
 489                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 490                         break;
 491         }
 492         cb->family = idx;
 493
 494         return skb->len;
 495 }
 496
 497 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 498 {
 499         struct sk_buff *skb;
 500         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
 501                                sizeof(struct rtnl_link_ifmap) +
 502                                sizeof(struct rtnl_link_stats) + 128);
 503
 504         skb = alloc_skb(size, GFP_KERNEL);
 505         if (!skb)
 506                 return;
 507
 508         if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) {
 509                 kfree_skb(skb);
 510                 return;
 511         }
 512         NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
 513         netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
 514 }
 515
 516 /* Protected by RTNL sempahore.  */
 517 static struct rtattr **rta_buf;
 518 static int rtattr_max;
 519
 520 /* Process one rtnetlink message. */
 521
 522 static __inline__ int
 523 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 524 {
 525         struct rtnetlink_link *link;
 526         struct rtnetlink_link *link_tab;
 527         int sz_idx, kind;
 528         int min_len;
 529         int family;
 530         int type;
 531         int err;
 532
 533         /* Only requests are handled by kernel now */
 534         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 535                 return 0;
 536
 537         type = nlh->nlmsg_type;
 538
 539         /* A control message: ignore them */
 540         if (type < RTM_BASE)
 541                 return 0;
 542
 543         /* Unknown message: reply with EINVAL */
 544         if (type > RTM_MAX)
 545                 goto err_inval;
 546
 547         type -= RTM_BASE;
 548
 549         /* All the messages must have at least 1 byte length */
 550         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
 551                 return 0;
 552
 553         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
 554         if (family >= NPROTO) {
 555                 *errp = -EAFNOSUPPORT;
 556                 return -1;
 557         }
 558
 559         link_tab = rtnetlink_links[family];
 560         if (link_tab == NULL)
 561                 link_tab = rtnetlink_links[PF_UNSPEC];
 562         link = &link_tab[type];
 563
 564         sz_idx = type>>2;
 565         kind = type&3;
 566
 567         if (kind != 2 && security_netlink_recv(skb)) {
 568                 *errp = -EPERM;
 569                 return -1;
 570         }
 571
 572         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 573                 if (link->dumpit == NULL)
 574                         link = &(rtnetlink_links[PF_UNSPEC][type]);
 575
 576                 if (link->dumpit == NULL)
 577                         goto err_inval;
 578
 579                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
 580                                                 link->dumpit, NULL)) != 0) {
 581                         return -1;
 582                 }
 583
 584                 netlink_queue_skip(nlh, skb);
 585                 return -1;
 586         }
 587
 588         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
 589
 590         min_len = rtm_min[sz_idx];
 591         if (nlh->nlmsg_len < min_len)
 592                 goto err_inval;
 593
 594         if (nlh->nlmsg_len > min_len) {
 595                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
 596                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
 597
 598                 while (RTA_OK(attr, attrlen)) {
 599                         unsigned flavor = attr->rta_type;
 600                         if (flavor) {
 601                                 if (flavor > rta_max[sz_idx])
 602                                         goto err_inval;
 603                                 rta_buf[flavor-1] = attr;
 604                         }
 605                         attr = RTA_NEXT(attr, attrlen);
 606                 }
 607         }
 608
 609         if (link->doit == NULL)
 610                 link = &(rtnetlink_links[PF_UNSPEC][type]);
 611         if (link->doit == NULL)
 612                 goto err_inval;
 613         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
 614
 615         *errp = err;
 616         return err;
 617
 618 err_inval:
 619         *errp = -EINVAL;
 620         return -1;
 621 }
 622
 623 static void rtnetlink_rcv(struct sock *sk, int len)
 624 {
 625         unsigned int qlen = 0;
 626
 627         do {
 628                 rtnl_lock();
 629                 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
 630                 up(&rtnl_sem);
 631
 632                 netdev_run_todo();
 633         } while (qlen);
 634 }
 635
 636 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 637 {
 638         [RTM_GETLINK     - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo },
 639         [RTM_SETLINK     - RTM_BASE] = { .doit   = do_setlink            },
 640         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 641         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 642         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
 643         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
 644         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
 645         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 646         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
 647         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
 648 };
 649
 650 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 651 {
 652         struct net_device *dev = ptr;
 653         switch (event) {
 654         case NETDEV_UNREGISTER:
 655                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 656                 break;
 657         case NETDEV_REGISTER:
 658                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
 659                 break;
 660         case NETDEV_UP:
 661         case NETDEV_DOWN:
 662                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
 663                 break;
 664         case NETDEV_CHANGE:
 665         case NETDEV_GOING_DOWN:
 666                 break;
 667         default:
 668                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 669                 break;
 670         }
 671         return NOTIFY_DONE;
 672 }
 673
 674 static struct notifier_block rtnetlink_dev_notifier = {
 675         .notifier_call  = rtnetlink_event,
 676 };
 677
 678 void __init rtnetlink_init(void)
 679 {
 680         int i;
 681
 682         rtattr_max = 0;
 683         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
 684                 if (rta_max[i] > rtattr_max)
 685                         rtattr_max = rta_max[i];
 686         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
 687         if (!rta_buf)
 688                 panic("rtnetlink_init: cannot allocate rta_buf\n");
 689
 690         rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
 691                                      THIS_MODULE);
 692         if (rtnl == NULL)
 693                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
 694         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
 695         register_netdevice_notifier(&rtnetlink_dev_notifier);
 696         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
 697         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
 698 }
 699
 700 EXPORT_SYMBOL(__rta_fill);
 701 EXPORT_SYMBOL(rtattr_strlcpy);
 702 EXPORT_SYMBOL(rtattr_parse);
 703 EXPORT_SYMBOL(rtnetlink_links);
 704 EXPORT_SYMBOL(rtnetlink_put_metrics);
 705 EXPORT_SYMBOL(rtnl);
 706 EXPORT_SYMBOL(rtnl_lock);
 707 EXPORT_SYMBOL(rtnl_lock_interruptible);
 708 EXPORT_SYMBOL(rtnl_sem);
 709 EXPORT_SYMBOL(rtnl_unlock);