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 #include <linux/mutex.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 #include <net/netlink.h>
  54 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
  55 #include <linux/wireless.h>
  56 #include <net/iw_handler.h>
  57 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
  58
  59 static DEFINE_MUTEX(rtnl_mutex);
  60
  61 void rtnl_lock(void)
  62 {
  63         mutex_lock(&rtnl_mutex);
  64 }
  65
  66 void __rtnl_unlock(void)
  67 {
  68         mutex_unlock(&rtnl_mutex);
  69 }
  70
  71 void rtnl_unlock(void)
  72 {
  73         mutex_unlock(&rtnl_mutex);
  74         if (rtnl && rtnl->sk_receive_queue.qlen)
  75                 rtnl->sk_data_ready(rtnl, 0);
  76         netdev_run_todo();
  77 }
  78
  79 int rtnl_trylock(void)
  80 {
  81         return mutex_trylock(&rtnl_mutex);
  82 }
  83
  84 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
  85 {
  86         memset(tb, 0, sizeof(struct rtattr*)*maxattr);
  87
  88         while (RTA_OK(rta, len)) {
  89                 unsigned flavor = rta->rta_type;
  90                 if (flavor && flavor <= maxattr)
  91                         tb[flavor-1] = rta;
  92                 rta = RTA_NEXT(rta, len);
  93         }
  94         return 0;
  95 }
  96
  97 struct sock *rtnl;
  98
  99 struct rtnetlink_link * rtnetlink_links[NPROTO];
 100
 101 static const int rtm_min[RTM_NR_FAMILIES] =
 102 {
 103         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 104         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
 105         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
 106         [RTM_FAM(RTM_NEWNEIGH)]     = NLMSG_LENGTH(sizeof(struct ndmsg)),
 107         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct rtmsg)),
 108         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
 109         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
 110         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
 111         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
 112         [RTM_FAM(RTM_NEWPREFIX)]    = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 113         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 114         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 115         [RTM_FAM(RTM_NEWNEIGHTBL)]  = NLMSG_LENGTH(sizeof(struct ndtmsg)),
 116 };
 117
 118 static const int rta_max[RTM_NR_FAMILIES] =
 119 {
 120         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 121         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 122         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 123         [RTM_FAM(RTM_NEWNEIGH)]     = NDA_MAX,
 124         [RTM_FAM(RTM_NEWRULE)]      = RTA_MAX,
 125         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 126         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 127         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 128         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 129         [RTM_FAM(RTM_NEWNEIGHTBL)]  = NDTA_MAX,
 130 };
 131
 132 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 133 {
 134         struct rtattr *rta;
 135         int size = RTA_LENGTH(attrlen);
 136
 137         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
 138         rta->rta_type = attrtype;
 139         rta->rta_len = size;
 140         memcpy(RTA_DATA(rta), data, attrlen);
 141         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 142 }
 143
 144 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
 145 {
 146         size_t ret = RTA_PAYLOAD(rta);
 147         char *src = RTA_DATA(rta);
 148
 149         if (ret > 0 && src[ret - 1] == '\0')
 150                 ret--;
 151         if (size > 0) {
 152                 size_t len = (ret >= size) ? size - 1 : ret;
 153                 memset(dest, 0, size);
 154                 memcpy(dest, src, len);
 155         }
 156         return ret;
 157 }
 158
 159 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
 160 {
 161         int err = 0;
 162
 163         NETLINK_CB(skb).dst_group = group;
 164         if (echo)
 165                 atomic_inc(&skb->users);
 166         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 167         if (echo)
 168                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 169         return err;
 170 }
 171
 172 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 173 {
 174         struct rtattr *mx = (struct rtattr*)skb->tail;
 175         int i;
 176
 177         RTA_PUT(skb, RTA_METRICS, 0, NULL);
 178         for (i=0; i<RTAX_MAX; i++) {
 179                 if (metrics[i])
 180                         RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
 181         }
 182         mx->rta_len = skb->tail - (u8*)mx;
 183         if (mx->rta_len == RTA_LENGTH(0))
 184                 skb_trim(skb, (u8*)mx - skb->data);
 185         return 0;
 186
 187 rtattr_failure:
 188         skb_trim(skb, (u8*)mx - skb->data);
 189         return -1;
 190 }
 191
 192
 193 static void set_operstate(struct net_device *dev, unsigned char transition)
 194 {
 195         unsigned char operstate = dev->operstate;
 196
 197         switch(transition) {
 198         case IF_OPER_UP:
 199                 if ((operstate == IF_OPER_DORMANT ||
 200                      operstate == IF_OPER_UNKNOWN) &&
 201                     !netif_dormant(dev))
 202                         operstate = IF_OPER_UP;
 203                 break;
 204
 205         case IF_OPER_DORMANT:
 206                 if (operstate == IF_OPER_UP ||
 207                     operstate == IF_OPER_UNKNOWN)
 208                         operstate = IF_OPER_DORMANT;
 209                 break;
 210         };
 211
 212         if (dev->operstate != operstate) {
 213                 write_lock_bh(&dev_base_lock);
 214                 dev->operstate = operstate;
 215                 write_unlock_bh(&dev_base_lock);
 216                 netdev_state_change(dev);
 217         }
 218 }
 219
 220 static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 221                                  int type, u32 pid, u32 seq, u32 change,
 222                                  unsigned int flags)
 223 {
 224         struct ifinfomsg *r;
 225         struct nlmsghdr  *nlh;
 226         unsigned char    *b = skb->tail;
 227
 228         nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags);
 229         r = NLMSG_DATA(nlh);
 230         r->ifi_family = AF_UNSPEC;
 231         r->__ifi_pad = 0;
 232         r->ifi_type = dev->type;
 233         r->ifi_index = dev->ifindex;
 234         r->ifi_flags = dev_get_flags(dev);
 235         r->ifi_change = change;
 236
 237         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
 238
 239         if (1) {
 240                 u32 txqlen = dev->tx_queue_len;
 241                 RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
 242         }
 243
 244         if (1) {
 245                 u32 weight = dev->weight;
 246                 RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
 247         }
 248
 249         if (1) {
 250                 u8 operstate = netif_running(dev)?dev->operstate:IF_OPER_DOWN;
 251                 u8 link_mode = dev->link_mode;
 252                 RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate);
 253                 RTA_PUT(skb, IFLA_LINKMODE, sizeof(link_mode), &link_mode);
 254         }
 255
 256         if (1) {
 257                 struct rtnl_link_ifmap map = {
 258                         .mem_start   = dev->mem_start,
 259                         .mem_end     = dev->mem_end,
 260                         .base_addr   = dev->base_addr,
 261                         .irq         = dev->irq,
 262                         .dma         = dev->dma,
 263                         .port        = dev->if_port,
 264                 };
 265                 RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 266         }
 267
 268         if (dev->addr_len) {
 269                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 270                 RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 271         }
 272
 273         if (1) {
 274                 u32 mtu = dev->mtu;
 275                 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
 276         }
 277
 278         if (dev->ifindex != dev->iflink) {
 279                 u32 iflink = dev->iflink;
 280                 RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
 281         }
 282
 283         if (dev->qdisc_sleeping)
 284                 RTA_PUT(skb, IFLA_QDISC,
 285                         strlen(dev->qdisc_sleeping->ops->id) + 1,
 286                         dev->qdisc_sleeping->ops->id);
 287
 288         if (dev->master) {
 289                 u32 master = dev->master->ifindex;
 290                 RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
 291         }
 292
 293         if (dev->get_stats) {
 294                 unsigned long *stats = (unsigned long*)dev->get_stats(dev);
 295                 if (stats) {
 296                         struct rtattr  *a;
 297                         __u32          *s;
 298                         int             i;
 299                         int             n = sizeof(struct rtnl_link_stats)/4;
 300
 301                         a = __RTA_PUT(skb, IFLA_STATS, n*4);
 302                         s = RTA_DATA(a);
 303                         for (i=0; i<n; i++)
 304                                 s[i] = stats[i];
 305                 }
 306         }
 307         nlh->nlmsg_len = skb->tail - b;
 308         return skb->len;
 309
 310 nlmsg_failure:
 311 rtattr_failure:
 312         skb_trim(skb, b - skb->data);
 313         return -1;
 314 }
 315
 316 static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 317 {
 318         int idx;
 319         int s_idx = cb->args[0];
 320         struct net_device *dev;
 321
 322         read_lock(&dev_base_lock);
 323         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 324                 if (idx < s_idx)
 325                         continue;
 326                 if (vx_info_flags(skb->sk->sk_vx_info, VXF_HIDE_NETIF, 0) &&
 327                         !dev_in_nx_info(dev, skb->sk->sk_nx_info))
 328                         continue;
 329                 if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK,
 330                                           NETLINK_CB(cb->skb).pid,
 331                                           cb->nlh->nlmsg_seq, 0,
 332                                           NLM_F_MULTI) <= 0)
 333                         break;
 334         }
 335         read_unlock(&dev_base_lock);
 336         cb->args[0] = idx;
 337
 338         return skb->len;
 339 }
 340
 341 static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 342 {
 343         struct ifinfomsg  *ifm = NLMSG_DATA(nlh);
 344         struct rtattr    **ida = arg;
 345         struct net_device *dev;
 346         int err, send_addr_notify = 0;
 347
 348         if (ifm->ifi_index >= 0)
 349                 dev = dev_get_by_index(ifm->ifi_index);
 350         else if (ida[IFLA_IFNAME - 1]) {
 351                 char ifname[IFNAMSIZ];
 352
 353                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 354                                    IFNAMSIZ) >= IFNAMSIZ)
 355                         return -EINVAL;
 356                 dev = dev_get_by_name(ifname);
 357         } else
 358                 return -EINVAL;
 359
 360         if (!dev)
 361                 return -ENODEV;
 362
 363         err = -EINVAL;
 364
 365         if (ifm->ifi_flags)
 366                 dev_change_flags(dev, ifm->ifi_flags);
 367
 368         if (ida[IFLA_MAP - 1]) {
 369                 struct rtnl_link_ifmap *u_map;
 370                 struct ifmap k_map;
 371
 372                 if (!dev->set_config) {
 373                         err = -EOPNOTSUPP;
 374                         goto out;
 375                 }
 376
 377                 if (!netif_device_present(dev)) {
 378                         err = -ENODEV;
 379                         goto out;
 380                 }
 381
 382                 if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
 383                         goto out;
 384
 385                 u_map = RTA_DATA(ida[IFLA_MAP - 1]);
 386
 387                 k_map.mem_start = (unsigned long) u_map->mem_start;
 388                 k_map.mem_end = (unsigned long) u_map->mem_end;
 389                 k_map.base_addr = (unsigned short) u_map->base_addr;
 390                 k_map.irq = (unsigned char) u_map->irq;
 391                 k_map.dma = (unsigned char) u_map->dma;
 392                 k_map.port = (unsigned char) u_map->port;
 393
 394                 err = dev->set_config(dev, &k_map);
 395
 396                 if (err)
 397                         goto out;
 398         }
 399
 400         if (ida[IFLA_ADDRESS - 1]) {
 401                 struct sockaddr *sa;
 402                 int len;
 403
 404                 if (!dev->set_mac_address) {
 405                         err = -EOPNOTSUPP;
 406                         goto out;
 407                 }
 408                 if (!netif_device_present(dev)) {
 409                         err = -ENODEV;
 410                         goto out;
 411                 }
 412                 if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 413                         goto out;
 414
 415                 len = sizeof(sa_family_t) + dev->addr_len;
 416                 sa = kmalloc(len, GFP_KERNEL);
 417                 if (!sa) {
 418                         err = -ENOMEM;
 419                         goto out;
 420                 }
 421                 sa->sa_family = dev->type;
 422                 memcpy(sa->sa_data, RTA_DATA(ida[IFLA_ADDRESS - 1]),
 423                        dev->addr_len);
 424                 err = dev->set_mac_address(dev, sa);
 425                 kfree(sa);
 426                 if (err)
 427                         goto out;
 428                 send_addr_notify = 1;
 429         }
 430
 431         if (ida[IFLA_BROADCAST - 1]) {
 432                 if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
 433                         goto out;
 434                 memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
 435                        dev->addr_len);
 436                 send_addr_notify = 1;
 437         }
 438
 439         if (ida[IFLA_MTU - 1]) {
 440                 if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 441                         goto out;
 442                 err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
 443
 444                 if (err)
 445                         goto out;
 446
 447         }
 448
 449         if (ida[IFLA_TXQLEN - 1]) {
 450                 if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 451                         goto out;
 452
 453                 dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
 454         }
 455
 456         if (ida[IFLA_WEIGHT - 1]) {
 457                 if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
 458                         goto out;
 459
 460                 dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
 461         }
 462
 463         if (ida[IFLA_OPERSTATE - 1]) {
 464                 if (ida[IFLA_OPERSTATE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
 465                         goto out;
 466
 467                 set_operstate(dev, *((u8 *) RTA_DATA(ida[IFLA_OPERSTATE - 1])));
 468         }
 469
 470         if (ida[IFLA_LINKMODE - 1]) {
 471                 if (ida[IFLA_LINKMODE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
 472                         goto out;
 473
 474                 write_lock_bh(&dev_base_lock);
 475                 dev->link_mode = *((u8 *) RTA_DATA(ida[IFLA_LINKMODE - 1]));
 476                 write_unlock_bh(&dev_base_lock);
 477         }
 478
 479         if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
 480                 char ifname[IFNAMSIZ];
 481
 482                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
 483                                    IFNAMSIZ) >= IFNAMSIZ)
 484                         goto out;
 485                 err = dev_change_name(dev, ifname);
 486                 if (err)
 487                         goto out;
 488         }
 489
 490 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 491         if (ida[IFLA_WIRELESS - 1]) {
 492
 493                 /* Call Wireless Extensions.
 494                  * Various stuff checked in there... */
 495                 err = wireless_rtnetlink_set(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len);
 496                 if (err)
 497                         goto out;
 498         }
 499 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 500
 501         err = 0;
 502
 503 out:
 504         if (send_addr_notify)
 505                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 506
 507         dev_put(dev);
 508         return err;
 509 }
 510
 511 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 512 static int do_getlink(struct sk_buff *in_skb, struct nlmsghdr* in_nlh, void *arg)
 513 {
 514         struct ifinfomsg  *ifm = NLMSG_DATA(in_nlh);
 515         struct rtattr    **ida = arg;
 516         struct net_device *dev;
 517         struct ifinfomsg *r;
 518         struct nlmsghdr  *nlh;
 519         int err = -ENOBUFS;
 520         struct sk_buff *skb;
 521         unsigned char    *b;
 522         char *iw_buf = NULL;
 523         int iw_buf_len = 0;
 524
 525         if (ifm->ifi_index >= 0)
 526                 dev = dev_get_by_index(ifm->ifi_index);
 527         else
 528                 return -EINVAL;
 529         if (!dev)
 530                 return -ENODEV;
 531
 532 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 533         if (ida[IFLA_WIRELESS - 1]) {
 534
 535                 /* Call Wireless Extensions. We need to know the size before
 536                  * we can alloc. Various stuff checked in there... */
 537                 err = wireless_rtnetlink_get(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len, &iw_buf, &iw_buf_len);
 538                 if (err)
 539                         goto out;
 540         }
 541 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 542
 543         /* Create a skb big enough to include all the data.
 544          * Some requests are way bigger than 4k... Jean II */
 545         skb = alloc_skb((NLMSG_LENGTH(sizeof(*r))) + (RTA_SPACE(iw_buf_len)),
 546                         GFP_KERNEL);
 547         if (!skb)
 548                 goto out;
 549         b = skb->tail;
 550
 551         /* Put in the message the usual good stuff */
 552         nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, in_nlh->nlmsg_seq,
 553                         RTM_NEWLINK, sizeof(*r));
 554         r = NLMSG_DATA(nlh);
 555         r->ifi_family = AF_UNSPEC;
 556         r->__ifi_pad = 0;
 557         r->ifi_type = dev->type;
 558         r->ifi_index = dev->ifindex;
 559         r->ifi_flags = dev->flags;
 560         r->ifi_change = 0;
 561
 562         /* Put the wireless payload if it exist */
 563         if(iw_buf != NULL)
 564                 RTA_PUT(skb, IFLA_WIRELESS, iw_buf_len,
 565                         iw_buf + IW_EV_POINT_OFF);
 566
 567         nlh->nlmsg_len = skb->tail - b;
 568
 569         /* Needed ? */
 570         NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
 571
 572         err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
 573         if (err > 0)
 574                 err = 0;
 575 out:
 576         if(iw_buf != NULL)
 577                 kfree(iw_buf);
 578         dev_put(dev);
 579         return err;
 580
 581 rtattr_failure:
 582 nlmsg_failure:
 583         kfree_skb(skb);
 584         goto out;
 585 }
 586 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 587
 588 static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 589 {
 590         int idx;
 591         int s_idx = cb->family;
 592
 593         if (s_idx == 0)
 594                 s_idx = 1;
 595         for (idx=1; idx<NPROTO; idx++) {
 596                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 597                 if (idx < s_idx || idx == PF_PACKET)
 598                         continue;
 599                 if (rtnetlink_links[idx] == NULL ||
 600                     rtnetlink_links[idx][type].dumpit == NULL)
 601                         continue;
 602                 if (idx > s_idx)
 603                         memset(&cb->args[0], 0, sizeof(cb->args));
 604                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 605                         break;
 606         }
 607         cb->family = idx;
 608
 609         return skb->len;
 610 }
 611
 612 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 613 {
 614         struct sk_buff *skb;
 615         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
 616                                sizeof(struct rtnl_link_ifmap) +
 617                                sizeof(struct rtnl_link_stats) + 128);
 618
 619         if (vx_flags(VXF_HIDE_NETIF, 0) &&
 620                 !dev_in_nx_info(dev, current->nx_info))
 621                 return;
 622         skb = alloc_skb(size, GFP_KERNEL);
 623         if (!skb)
 624                 return;
 625
 626         if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) {
 627                 kfree_skb(skb);
 628                 return;
 629         }
 630         NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
 631         netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
 632 }
 633
 634 /* Protected by RTNL sempahore.  */
 635 static struct rtattr **rta_buf;
 636 static int rtattr_max;
 637
 638 /* Process one rtnetlink message. */
 639
 640 static __inline__ int
 641 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 642 {
 643         struct rtnetlink_link *link;
 644         struct rtnetlink_link *link_tab;
 645         int sz_idx, kind;
 646         int min_len;
 647         int family;
 648         int type;
 649         int err;
 650
 651         /* Only requests are handled by kernel now */
 652         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 653                 return 0;
 654
 655         type = nlh->nlmsg_type;
 656
 657         /* A control message: ignore them */
 658         if (type < RTM_BASE)
 659                 return 0;
 660
 661         /* Unknown message: reply with EINVAL */
 662         if (type > RTM_MAX)
 663                 goto err_inval;
 664
 665         type -= RTM_BASE;
 666
 667         /* All the messages must have at least 1 byte length */
 668         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
 669                 return 0;
 670
 671         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
 672         if (family >= NPROTO) {
 673                 *errp = -EAFNOSUPPORT;
 674                 return -1;
 675         }
 676
 677         link_tab = rtnetlink_links[family];
 678         if (link_tab == NULL)
 679                 link_tab = rtnetlink_links[PF_UNSPEC];
 680         link = &link_tab[type];
 681
 682         sz_idx = type>>2;
 683         kind = type&3;
 684
 685         if (kind != 2 && security_netlink_recv(skb)) {
 686                 *errp = -EPERM;
 687                 return -1;
 688         }
 689
 690         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 691                 if (link->dumpit == NULL)
 692                         link = &(rtnetlink_links[PF_UNSPEC][type]);
 693
 694                 if (link->dumpit == NULL)
 695                         goto err_inval;
 696
 697                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
 698                                                 link->dumpit, NULL)) != 0) {
 699                         return -1;
 700                 }
 701
 702                 netlink_queue_skip(nlh, skb);
 703                 return -1;
 704         }
 705
 706         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
 707
 708         min_len = rtm_min[sz_idx];
 709         if (nlh->nlmsg_len < min_len)
 710                 goto err_inval;
 711
 712         if (nlh->nlmsg_len > min_len) {
 713                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
 714                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
 715
 716                 while (RTA_OK(attr, attrlen)) {
 717                         unsigned flavor = attr->rta_type;
 718                         if (flavor) {
 719                                 if (flavor > rta_max[sz_idx])
 720                                         goto err_inval;
 721                                 rta_buf[flavor-1] = attr;
 722                         }
 723                         attr = RTA_NEXT(attr, attrlen);
 724                 }
 725         }
 726
 727         if (link->doit == NULL)
 728                 link = &(rtnetlink_links[PF_UNSPEC][type]);
 729         if (link->doit == NULL)
 730                 goto err_inval;
 731         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
 732
 733         *errp = err;
 734         return err;
 735
 736 err_inval:
 737         *errp = -EINVAL;
 738         return -1;
 739 }
 740
 741 static void rtnetlink_rcv(struct sock *sk, int len)
 742 {
 743         unsigned int qlen = 0;
 744
 745         do {
 746                 mutex_lock(&rtnl_mutex);
 747                 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
 748                 mutex_unlock(&rtnl_mutex);
 749
 750                 netdev_run_todo();
 751         } while (qlen);
 752 }
 753
 754 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 755 {
 756         [RTM_GETLINK     - RTM_BASE] = {
 757 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 758                                          .doit   = do_getlink,
 759 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 760                                          .dumpit = rtnetlink_dump_ifinfo },
 761         [RTM_SETLINK     - RTM_BASE] = { .doit   = do_setlink            },
 762         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 763         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 764         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
 765         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
 766         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
 767         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 768         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
 769         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
 770 };
 771
 772 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 773 {
 774         struct net_device *dev = ptr;
 775         switch (event) {
 776         case NETDEV_UNREGISTER:
 777                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 778                 break;
 779         case NETDEV_REGISTER:
 780                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
 781                 break;
 782         case NETDEV_UP:
 783         case NETDEV_DOWN:
 784                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
 785                 break;
 786         case NETDEV_CHANGE:
 787         case NETDEV_GOING_DOWN:
 788                 break;
 789         default:
 790                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 791                 break;
 792         }
 793         return NOTIFY_DONE;
 794 }
 795
 796 static struct notifier_block rtnetlink_dev_notifier = {
 797         .notifier_call  = rtnetlink_event,
 798 };
 799
 800 void __init rtnetlink_init(void)
 801 {
 802         int i;
 803
 804         rtattr_max = 0;
 805         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
 806                 if (rta_max[i] > rtattr_max)
 807                         rtattr_max = rta_max[i];
 808         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
 809         if (!rta_buf)
 810                 panic("rtnetlink_init: cannot allocate rta_buf\n");
 811
 812         rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
 813                                      THIS_MODULE);
 814         if (rtnl == NULL)
 815                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
 816         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
 817         register_netdevice_notifier(&rtnetlink_dev_notifier);
 818         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
 819         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
 820 }
 821
 822 EXPORT_SYMBOL(__rta_fill);
 823 EXPORT_SYMBOL(rtattr_strlcpy);
 824 EXPORT_SYMBOL(rtattr_parse);
 825 EXPORT_SYMBOL(rtnetlink_links);
 826 EXPORT_SYMBOL(rtnetlink_put_metrics);
 827 EXPORT_SYMBOL(rtnl);
 828 EXPORT_SYMBOL(rtnl_lock);
 829 EXPORT_SYMBOL(rtnl_trylock);
 830 EXPORT_SYMBOL(rtnl_unlock);