SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 222                                  struct net_device_stats *b)
 223 {
 224         a->rx_packets = b->rx_packets;
 225         a->tx_packets = b->tx_packets;
 226         a->rx_bytes = b->rx_bytes;
 227         a->tx_bytes = b->tx_bytes;
 228         a->rx_errors = b->rx_errors;
 229         a->tx_errors = b->tx_errors;
 230         a->rx_dropped = b->rx_dropped;
 231         a->tx_dropped = b->tx_dropped;
 232
 233         a->multicast = b->multicast;
 234         a->collisions = b->collisions;
 235
 236         a->rx_length_errors = b->rx_length_errors;
 237         a->rx_over_errors = b->rx_over_errors;
 238         a->rx_crc_errors = b->rx_crc_errors;
 239         a->rx_frame_errors = b->rx_frame_errors;
 240         a->rx_fifo_errors = b->rx_fifo_errors;
 241         a->rx_missed_errors = b->rx_missed_errors;
 242
 243         a->tx_aborted_errors = b->tx_aborted_errors;
 244         a->tx_carrier_errors = b->tx_carrier_errors;
 245         a->tx_fifo_errors = b->tx_fifo_errors;
 246         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 247         a->tx_window_errors = b->tx_window_errors;
 248
 249         a->rx_compressed = b->rx_compressed;
 250         a->tx_compressed = b->tx_compressed;
 251 };
 252
 253 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 254                             void *iwbuf, int iwbuflen, int type, u32 pid,
 255                             u32 seq, u32 change, unsigned int flags)
 256 {
 257         struct ifinfomsg *ifm;
 258         struct nlmsghdr *nlh;
 259
 260         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 261         if (nlh == NULL)
 262                 return -ENOBUFS;
 263
 264         ifm = nlmsg_data(nlh);
 265         ifm->ifi_family = AF_UNSPEC;
 266         ifm->__ifi_pad = 0;
 267         ifm->ifi_type = dev->type;
 268         ifm->ifi_index = dev->ifindex;
 269         ifm->ifi_flags = dev_get_flags(dev);
 270         ifm->ifi_change = change;
 271
 272         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 273         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
 274         NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
 275         NLA_PUT_U8(skb, IFLA_OPERSTATE,
 276                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
 277         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
 278         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
 279
 280         if (dev->ifindex != dev->iflink)
 281                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
 282
 283         if (dev->master)
 284                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
 285
 286         if (dev->qdisc_sleeping)
 287                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
 288
 289         if (1) {
 290                 struct rtnl_link_ifmap map = {
 291                         .mem_start   = dev->mem_start,
 292                         .mem_end     = dev->mem_end,
 293                         .base_addr   = dev->base_addr,
 294                         .irq         = dev->irq,
 295                         .dma         = dev->dma,
 296                         .port        = dev->if_port,
 297                 };
 298                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 299         }
 300
 301         if (dev->addr_len) {
 302                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 303                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 304         }
 305
 306         if (dev->get_stats) {
 307                 struct net_device_stats *stats = dev->get_stats(dev);
 308                 if (stats) {
 309                         struct nlattr *attr;
 310
 311                         attr = nla_reserve(skb, IFLA_STATS,
 312                                            sizeof(struct rtnl_link_stats));
 313                         if (attr == NULL)
 314                                 goto nla_put_failure;
 315
 316                         copy_rtnl_link_stats(nla_data(attr), stats);
 317                 }
 318         }
 319
 320         if (iwbuf)
 321                 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
 322
 323         return nlmsg_end(skb, nlh);
 324
 325 nla_put_failure:
 326         return nlmsg_cancel(skb, nlh);
 327 }
 328
 329 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 330 {
 331         int idx;
 332         int s_idx = cb->args[0];
 333         struct net_device *dev;
 334
 335         read_lock(&dev_base_lock);
 336         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 337                 if (idx < s_idx)
 338                         continue;
 339                 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
 340                                      NETLINK_CB(cb->skb).pid,
 341                                      cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
 342                         break;
 343         }
 344         read_unlock(&dev_base_lock);
 345         cb->args[0] = idx;
 346
 347         return skb->len;
 348 }
 349
 350 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
 351         [IFLA_IFNAME]           = { .type = NLA_STRING },
 352         [IFLA_MAP]              = { .minlen = sizeof(struct rtnl_link_ifmap) },
 353         [IFLA_MTU]              = { .type = NLA_U32 },
 354         [IFLA_TXQLEN]           = { .type = NLA_U32 },
 355         [IFLA_WEIGHT]           = { .type = NLA_U32 },
 356         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
 357         [IFLA_LINKMODE]         = { .type = NLA_U8 },
 358 };
 359
 360 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 361 {
 362         struct ifinfomsg *ifm;
 363         struct net_device *dev;
 364         int err, send_addr_notify = 0, modified = 0;
 365         struct nlattr *tb[IFLA_MAX+1];
 366         char ifname[IFNAMSIZ];
 367
 368         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 369         if (err < 0)
 370                 goto errout;
 371
 372         if (tb[IFLA_IFNAME] &&
 373             nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ) >= IFNAMSIZ)
 374                 return -EINVAL;
 375
 376         err = -EINVAL;
 377         ifm = nlmsg_data(nlh);
 378         if (ifm->ifi_index >= 0)
 379                 dev = dev_get_by_index(ifm->ifi_index);
 380         else if (tb[IFLA_IFNAME])
 381                 dev = dev_get_by_name(ifname);
 382         else
 383                 goto errout;
 384
 385         if (dev == NULL) {
 386                 err = -ENODEV;
 387                 goto errout;
 388         }
 389
 390         if (tb[IFLA_ADDRESS] &&
 391             nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
 392                 goto errout_dev;
 393
 394         if (tb[IFLA_BROADCAST] &&
 395             nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
 396                 goto errout_dev;
 397
 398         if (tb[IFLA_MAP]) {
 399                 struct rtnl_link_ifmap *u_map;
 400                 struct ifmap k_map;
 401
 402                 if (!dev->set_config) {
 403                         err = -EOPNOTSUPP;
 404                         goto errout_dev;
 405                 }
 406
 407                 if (!netif_device_present(dev)) {
 408                         err = -ENODEV;
 409                         goto errout_dev;
 410                 }
 411
 412                 u_map = nla_data(tb[IFLA_MAP]);
 413                 k_map.mem_start = (unsigned long) u_map->mem_start;
 414                 k_map.mem_end = (unsigned long) u_map->mem_end;
 415                 k_map.base_addr = (unsigned short) u_map->base_addr;
 416                 k_map.irq = (unsigned char) u_map->irq;
 417                 k_map.dma = (unsigned char) u_map->dma;
 418                 k_map.port = (unsigned char) u_map->port;
 419
 420                 err = dev->set_config(dev, &k_map);
 421                 if (err < 0)
 422                         goto errout_dev;
 423
 424                 modified = 1;
 425         }
 426
 427         if (tb[IFLA_ADDRESS]) {
 428                 struct sockaddr *sa;
 429                 int len;
 430
 431                 if (!dev->set_mac_address) {
 432                         err = -EOPNOTSUPP;
 433                         goto errout_dev;
 434                 }
 435
 436                 if (!netif_device_present(dev)) {
 437                         err = -ENODEV;
 438                         goto errout_dev;
 439                 }
 440
 441                 len = sizeof(sa_family_t) + dev->addr_len;
 442                 sa = kmalloc(len, GFP_KERNEL);
 443                 if (!sa) {
 444                         err = -ENOMEM;
 445                         goto errout_dev;
 446                 }
 447                 sa->sa_family = dev->type;
 448                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
 449                        dev->addr_len);
 450                 err = dev->set_mac_address(dev, sa);
 451                 kfree(sa);
 452                 if (err)
 453                         goto errout_dev;
 454                 send_addr_notify = 1;
 455                 modified = 1;
 456         }
 457
 458         if (tb[IFLA_MTU]) {
 459                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
 460                 if (err < 0)
 461                         goto errout_dev;
 462                 modified = 1;
 463         }
 464
 465         /*
 466          * Interface selected by interface index but interface
 467          * name provided implies that a name change has been
 468          * requested.
 469          */
 470         if (ifm->ifi_index >= 0 && ifname[0]) {
 471                 err = dev_change_name(dev, ifname);
 472                 if (err < 0)
 473                         goto errout_dev;
 474                 modified = 1;
 475         }
 476
 477 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 478         if (tb[IFLA_WIRELESS]) {
 479                 /* Call Wireless Extensions.
 480                  * Various stuff checked in there... */
 481                 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
 482                                              nla_len(tb[IFLA_WIRELESS]));
 483                 if (err < 0)
 484                         goto errout_dev;
 485         }
 486 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 487
 488         if (tb[IFLA_BROADCAST]) {
 489                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
 490                 send_addr_notify = 1;
 491         }
 492
 493
 494         if (ifm->ifi_flags)
 495                 dev_change_flags(dev, ifm->ifi_flags);
 496
 497         if (tb[IFLA_TXQLEN])
 498                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
 499
 500         if (tb[IFLA_WEIGHT])
 501                 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
 502
 503         if (tb[IFLA_OPERSTATE])
 504                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 505
 506         if (tb[IFLA_LINKMODE]) {
 507                 write_lock_bh(&dev_base_lock);
 508                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
 509                 write_unlock_bh(&dev_base_lock);
 510         }
 511
 512         err = 0;
 513
 514 errout_dev:
 515         if (err < 0 && modified && net_ratelimit())
 516                 printk(KERN_WARNING "A link change request failed with "
 517                        "some changes comitted already. Interface %s may "
 518                        "have been left with an inconsistent configuration, "
 519                        "please check.\n", dev->name);
 520
 521         if (send_addr_notify)
 522                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 523
 524         dev_put(dev);
 525 errout:
 526         return err;
 527 }
 528
 529 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 530 {
 531         struct ifinfomsg *ifm;
 532         struct nlattr *tb[IFLA_MAX+1];
 533         struct net_device *dev = NULL;
 534         struct sk_buff *nskb;
 535         char *iw_buf = NULL, *iw = NULL;
 536         int iw_buf_len = 0;
 537         int err, payload;
 538
 539         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 540         if (err < 0)
 541                 goto errout;
 542
 543         ifm = nlmsg_data(nlh);
 544         if (ifm->ifi_index >= 0) {
 545                 dev = dev_get_by_index(ifm->ifi_index);
 546                 if (dev == NULL)
 547                         return -ENODEV;
 548         } else
 549                 return -EINVAL;
 550
 551
 552 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 553         if (tb[IFLA_WIRELESS]) {
 554                 /* Call Wireless Extensions. We need to know the size before
 555                  * we can alloc. Various stuff checked in there... */
 556                 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
 557                                              nla_len(tb[IFLA_WIRELESS]),
 558                                              &iw_buf, &iw_buf_len);
 559                 if (err < 0)
 560                         goto errout;
 561
 562                 iw += IW_EV_POINT_OFF;
 563         }
 564 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 565
 566         payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) +
 567                               nla_total_size(iw_buf_len));
 568         nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL);
 569         if (nskb == NULL) {
 570                 err = -ENOBUFS;
 571                 goto errout;
 572         }
 573
 574         err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
 575                                NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
 576         if (err <= 0) {
 577                 kfree_skb(skb);
 578                 goto errout;
 579         }
 580
 581         err = netlink_unicast(rtnl, skb, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 582         if (err > 0)
 583                 err = 0;
 584 errout:
 585         kfree(iw_buf);
 586         dev_put(dev);
 587
 588         return err;
 589 }
 590
 591 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 592 {
 593         int idx;
 594         int s_idx = cb->family;
 595
 596         if (s_idx == 0)
 597                 s_idx = 1;
 598         for (idx=1; idx<NPROTO; idx++) {
 599                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 600                 if (idx < s_idx || idx == PF_PACKET)
 601                         continue;
 602                 if (rtnetlink_links[idx] == NULL ||
 603                     rtnetlink_links[idx][type].dumpit == NULL)
 604                         continue;
 605                 if (idx > s_idx)
 606                         memset(&cb->args[0], 0, sizeof(cb->args));
 607                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 608                         break;
 609         }
 610         cb->family = idx;
 611
 612         return skb->len;
 613 }
 614
 615 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 616 {
 617         struct sk_buff *skb;
 618         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
 619                                sizeof(struct rtnl_link_ifmap) +
 620                                sizeof(struct rtnl_link_stats) + 128);
 621
 622         skb = nlmsg_new(size, GFP_KERNEL);
 623         if (!skb)
 624                 return;
 625
 626         if (rtnl_fill_ifinfo(skb, dev, NULL, 0, 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, CAP_NET_ADMIN)) {
 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] = { .doit   = rtnl_getlink,
 757                                          .dumpit = rtnl_dump_ifinfo      },
 758         [RTM_SETLINK     - RTM_BASE] = { .doit   = rtnl_setlink          },
 759         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 760         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 761         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
 762         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
 763         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
 764 #ifdef CONFIG_FIB_RULES
 765         [RTM_NEWRULE     - RTM_BASE] = { .doit   = fib_nl_newrule        },
 766         [RTM_DELRULE     - RTM_BASE] = { .doit   = fib_nl_delrule        },
 767 #endif
 768         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 769         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
 770         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
 771 };
 772
 773 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 774 {
 775         struct net_device *dev = ptr;
 776         switch (event) {
 777         case NETDEV_UNREGISTER:
 778                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 779                 break;
 780         case NETDEV_REGISTER:
 781                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
 782                 break;
 783         case NETDEV_UP:
 784         case NETDEV_DOWN:
 785                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
 786                 break;
 787         case NETDEV_CHANGE:
 788         case NETDEV_GOING_DOWN:
 789                 break;
 790         default:
 791                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 792                 break;
 793         }
 794         return NOTIFY_DONE;
 795 }
 796
 797 static struct notifier_block rtnetlink_dev_notifier = {
 798         .notifier_call  = rtnetlink_event,
 799 };
 800
 801 void __init rtnetlink_init(void)
 802 {
 803         int i;
 804
 805         rtattr_max = 0;
 806         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
 807                 if (rta_max[i] > rtattr_max)
 808                         rtattr_max = rta_max[i];
 809         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
 810         if (!rta_buf)
 811                 panic("rtnetlink_init: cannot allocate rta_buf\n");
 812
 813         rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
 814                                      THIS_MODULE);
 815         if (rtnl == NULL)
 816                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
 817         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
 818         register_netdevice_notifier(&rtnetlink_dev_notifier);
 819         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
 820         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
 821 }
 822
 823 EXPORT_SYMBOL(__rta_fill);
 824 EXPORT_SYMBOL(rtattr_strlcpy);
 825 EXPORT_SYMBOL(rtattr_parse);
 826 EXPORT_SYMBOL(rtnetlink_links);
 827 EXPORT_SYMBOL(rtnetlink_put_metrics);
 828 EXPORT_SYMBOL(rtnl);
 829 EXPORT_SYMBOL(rtnl_lock);
 830 EXPORT_SYMBOL(rtnl_trylock);
 831 EXPORT_SYMBOL(rtnl_unlock);