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