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_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
 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 };
 116
 117 static const int rta_max[RTM_NR_FAMILIES] =
 118 {
 119         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 120         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 121         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 122         [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
 123         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 124         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 125         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 126         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 127 };
 128
 129 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 130 {
 131         struct rtattr *rta;
 132         int size = RTA_LENGTH(attrlen);
 133
 134         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
 135         rta->rta_type = attrtype;
 136         rta->rta_len = size;
 137         memcpy(RTA_DATA(rta), data, attrlen);
 138         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 139 }
 140
 141 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
 142 {
 143         size_t ret = RTA_PAYLOAD(rta);
 144         char *src = RTA_DATA(rta);
 145
 146         if (ret > 0 && src[ret - 1] == '\0')
 147                 ret--;
 148         if (size > 0) {
 149                 size_t len = (ret >= size) ? size - 1 : ret;
 150                 memset(dest, 0, size);
 151                 memcpy(dest, src, len);
 152         }
 153         return ret;
 154 }
 155
 156 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
 157 {
 158         int err = 0;
 159
 160         NETLINK_CB(skb).dst_group = group;
 161         if (echo)
 162                 atomic_inc(&skb->users);
 163         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 164         if (echo)
 165                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 166         return err;
 167 }
 168
 169 int rtnl_unicast(struct sk_buff *skb, u32 pid)
 170 {
 171         return nlmsg_unicast(rtnl, skb, pid);
 172 }
 173
 174 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 175 {
 176         struct rtattr *mx = (struct rtattr*)skb->tail;
 177         int i;
 178
 179         RTA_PUT(skb, RTA_METRICS, 0, NULL);
 180         for (i=0; i<RTAX_MAX; i++) {
 181                 if (metrics[i])
 182                         RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
 183         }
 184         mx->rta_len = skb->tail - (u8*)mx;
 185         if (mx->rta_len == RTA_LENGTH(0))
 186                 skb_trim(skb, (u8*)mx - skb->data);
 187         return 0;
 188
 189 rtattr_failure:
 190         skb_trim(skb, (u8*)mx - skb->data);
 191         return -1;
 192 }
 193
 194
 195 static void set_operstate(struct net_device *dev, unsigned char transition)
 196 {
 197         unsigned char operstate = dev->operstate;
 198
 199         switch(transition) {
 200         case IF_OPER_UP:
 201                 if ((operstate == IF_OPER_DORMANT ||
 202                      operstate == IF_OPER_UNKNOWN) &&
 203                     !netif_dormant(dev))
 204                         operstate = IF_OPER_UP;
 205                 break;
 206
 207         case IF_OPER_DORMANT:
 208                 if (operstate == IF_OPER_UP ||
 209                     operstate == IF_OPER_UNKNOWN)
 210                         operstate = IF_OPER_DORMANT;
 211                 break;
 212         };
 213
 214         if (dev->operstate != operstate) {
 215                 write_lock_bh(&dev_base_lock);
 216                 dev->operstate = operstate;
 217                 write_unlock_bh(&dev_base_lock);
 218                 netdev_state_change(dev);
 219         }
 220 }
 221
 222 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 223                                  struct net_device_stats *b)
 224 {
 225         a->rx_packets = b->rx_packets;
 226         a->tx_packets = b->tx_packets;
 227         a->rx_bytes = b->rx_bytes;
 228         a->tx_bytes = b->tx_bytes;
 229         a->rx_errors = b->rx_errors;
 230         a->tx_errors = b->tx_errors;
 231         a->rx_dropped = b->rx_dropped;
 232         a->tx_dropped = b->tx_dropped;
 233
 234         a->multicast = b->multicast;
 235         a->collisions = b->collisions;
 236
 237         a->rx_length_errors = b->rx_length_errors;
 238         a->rx_over_errors = b->rx_over_errors;
 239         a->rx_crc_errors = b->rx_crc_errors;
 240         a->rx_frame_errors = b->rx_frame_errors;
 241         a->rx_fifo_errors = b->rx_fifo_errors;
 242         a->rx_missed_errors = b->rx_missed_errors;
 243
 244         a->tx_aborted_errors = b->tx_aborted_errors;
 245         a->tx_carrier_errors = b->tx_carrier_errors;
 246         a->tx_fifo_errors = b->tx_fifo_errors;
 247         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 248         a->tx_window_errors = b->tx_window_errors;
 249
 250         a->rx_compressed = b->rx_compressed;
 251         a->tx_compressed = b->tx_compressed;
 252 };
 253
 254 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 255                             void *iwbuf, int iwbuflen, int type, u32 pid,
 256                             u32 seq, u32 change, unsigned int flags)
 257 {
 258         struct ifinfomsg *ifm;
 259         struct nlmsghdr *nlh;
 260
 261         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 262         if (nlh == NULL)
 263                 return -ENOBUFS;
 264
 265         ifm = nlmsg_data(nlh);
 266         ifm->ifi_family = AF_UNSPEC;
 267         ifm->__ifi_pad = 0;
 268         ifm->ifi_type = dev->type;
 269         ifm->ifi_index = dev->ifindex;
 270         ifm->ifi_flags = dev_get_flags(dev);
 271         ifm->ifi_change = change;
 272
 273         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 274         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
 275         NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
 276         NLA_PUT_U8(skb, IFLA_OPERSTATE,
 277                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
 278         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
 279         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
 280
 281         if (dev->ifindex != dev->iflink)
 282                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
 283
 284         if (dev->master)
 285                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
 286
 287         if (dev->qdisc_sleeping)
 288                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
 289
 290         if (1) {
 291                 struct rtnl_link_ifmap map = {
 292                         .mem_start   = dev->mem_start,
 293                         .mem_end     = dev->mem_end,
 294                         .base_addr   = dev->base_addr,
 295                         .irq         = dev->irq,
 296                         .dma         = dev->dma,
 297                         .port        = dev->if_port,
 298                 };
 299                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 300         }
 301
 302         if (dev->addr_len) {
 303                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 304                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 305         }
 306
 307         if (dev->get_stats) {
 308                 struct net_device_stats *stats = dev->get_stats(dev);
 309                 if (stats) {
 310                         struct nlattr *attr;
 311
 312                         attr = nla_reserve(skb, IFLA_STATS,
 313                                            sizeof(struct rtnl_link_stats));
 314                         if (attr == NULL)
 315                                 goto nla_put_failure;
 316
 317                         copy_rtnl_link_stats(nla_data(attr), stats);
 318                 }
 319         }
 320
 321         if (iwbuf)
 322                 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
 323
 324         return nlmsg_end(skb, nlh);
 325
 326 nla_put_failure:
 327         return nlmsg_cancel(skb, nlh);
 328 }
 329
 330 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 331 {
 332         int idx;
 333         int s_idx = cb->args[0];
 334         struct net_device *dev;
 335
 336         read_lock(&dev_base_lock);
 337         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 338                 if (idx < s_idx)
 339                         continue;
 340                 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
 341                                      NETLINK_CB(cb->skb).pid,
 342                                      cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
 343                         break;
 344         }
 345         read_unlock(&dev_base_lock);
 346         cb->args[0] = idx;
 347
 348         return skb->len;
 349 }
 350
 351 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
 352         [IFLA_IFNAME]           = { .type = NLA_STRING },
 353         [IFLA_MAP]              = { .minlen = sizeof(struct rtnl_link_ifmap) },
 354         [IFLA_MTU]              = { .type = NLA_U32 },
 355         [IFLA_TXQLEN]           = { .type = NLA_U32 },
 356         [IFLA_WEIGHT]           = { .type = NLA_U32 },
 357         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
 358         [IFLA_LINKMODE]         = { .type = NLA_U8 },
 359 };
 360
 361 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 362 {
 363         struct ifinfomsg *ifm;
 364         struct net_device *dev;
 365         int err, send_addr_notify = 0, modified = 0;
 366         struct nlattr *tb[IFLA_MAX+1];
 367         char ifname[IFNAMSIZ];
 368
 369         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 370         if (err < 0)
 371                 goto errout;
 372
 373         if (tb[IFLA_IFNAME] &&
 374             nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ) >= IFNAMSIZ)
 375                 return -EINVAL;
 376
 377         err = -EINVAL;
 378         ifm = nlmsg_data(nlh);
 379         if (ifm->ifi_index >= 0)
 380                 dev = dev_get_by_index(ifm->ifi_index);
 381         else if (tb[IFLA_IFNAME])
 382                 dev = dev_get_by_name(ifname);
 383         else
 384                 goto errout;
 385
 386         if (dev == NULL) {
 387                 err = -ENODEV;
 388                 goto errout;
 389         }
 390
 391         if (tb[IFLA_ADDRESS] &&
 392             nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
 393                 goto errout_dev;
 394
 395         if (tb[IFLA_BROADCAST] &&
 396             nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
 397                 goto errout_dev;
 398
 399         if (tb[IFLA_MAP]) {
 400                 struct rtnl_link_ifmap *u_map;
 401                 struct ifmap k_map;
 402
 403                 if (!dev->set_config) {
 404                         err = -EOPNOTSUPP;
 405                         goto errout_dev;
 406                 }
 407
 408                 if (!netif_device_present(dev)) {
 409                         err = -ENODEV;
 410                         goto errout_dev;
 411                 }
 412
 413                 u_map = nla_data(tb[IFLA_MAP]);
 414                 k_map.mem_start = (unsigned long) u_map->mem_start;
 415                 k_map.mem_end = (unsigned long) u_map->mem_end;
 416                 k_map.base_addr = (unsigned short) u_map->base_addr;
 417                 k_map.irq = (unsigned char) u_map->irq;
 418                 k_map.dma = (unsigned char) u_map->dma;
 419                 k_map.port = (unsigned char) u_map->port;
 420
 421                 err = dev->set_config(dev, &k_map);
 422                 if (err < 0)
 423                         goto errout_dev;
 424
 425                 modified = 1;
 426         }
 427
 428         if (tb[IFLA_ADDRESS]) {
 429                 struct sockaddr *sa;
 430                 int len;
 431
 432                 if (!dev->set_mac_address) {
 433                         err = -EOPNOTSUPP;
 434                         goto errout_dev;
 435                 }
 436
 437                 if (!netif_device_present(dev)) {
 438                         err = -ENODEV;
 439                         goto errout_dev;
 440                 }
 441
 442                 len = sizeof(sa_family_t) + dev->addr_len;
 443                 sa = kmalloc(len, GFP_KERNEL);
 444                 if (!sa) {
 445                         err = -ENOMEM;
 446                         goto errout_dev;
 447                 }
 448                 sa->sa_family = dev->type;
 449                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
 450                        dev->addr_len);
 451                 err = dev->set_mac_address(dev, sa);
 452                 kfree(sa);
 453                 if (err)
 454                         goto errout_dev;
 455                 send_addr_notify = 1;
 456                 modified = 1;
 457         }
 458
 459         if (tb[IFLA_MTU]) {
 460                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
 461                 if (err < 0)
 462                         goto errout_dev;
 463                 modified = 1;
 464         }
 465
 466         /*
 467          * Interface selected by interface index but interface
 468          * name provided implies that a name change has been
 469          * requested.
 470          */
 471         if (ifm->ifi_index >= 0 && ifname[0]) {
 472                 err = dev_change_name(dev, ifname);
 473                 if (err < 0)
 474                         goto errout_dev;
 475                 modified = 1;
 476         }
 477
 478 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 479         if (tb[IFLA_WIRELESS]) {
 480                 /* Call Wireless Extensions.
 481                  * Various stuff checked in there... */
 482                 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
 483                                              nla_len(tb[IFLA_WIRELESS]));
 484                 if (err < 0)
 485                         goto errout_dev;
 486         }
 487 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 488
 489         if (tb[IFLA_BROADCAST]) {
 490                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
 491                 send_addr_notify = 1;
 492         }
 493
 494
 495         if (ifm->ifi_flags)
 496                 dev_change_flags(dev, ifm->ifi_flags);
 497
 498         if (tb[IFLA_TXQLEN])
 499                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
 500
 501         if (tb[IFLA_WEIGHT])
 502                 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
 503
 504         if (tb[IFLA_OPERSTATE])
 505                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 506
 507         if (tb[IFLA_LINKMODE]) {
 508                 write_lock_bh(&dev_base_lock);
 509                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
 510                 write_unlock_bh(&dev_base_lock);
 511         }
 512
 513         err = 0;
 514
 515 errout_dev:
 516         if (err < 0 && modified && net_ratelimit())
 517                 printk(KERN_WARNING "A link change request failed with "
 518                        "some changes comitted already. Interface %s may "
 519                        "have been left with an inconsistent configuration, "
 520                        "please check.\n", dev->name);
 521
 522         if (send_addr_notify)
 523                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 524
 525         dev_put(dev);
 526 errout:
 527         return err;
 528 }
 529
 530 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 531 {
 532         struct ifinfomsg *ifm;
 533         struct nlattr *tb[IFLA_MAX+1];
 534         struct net_device *dev = NULL;
 535         struct sk_buff *nskb;
 536         char *iw_buf = NULL, *iw = NULL;
 537         int iw_buf_len = 0;
 538         int err, payload;
 539
 540         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 541         if (err < 0)
 542                 goto errout;
 543
 544         ifm = nlmsg_data(nlh);
 545         if (ifm->ifi_index >= 0) {
 546                 dev = dev_get_by_index(ifm->ifi_index);
 547                 if (dev == NULL)
 548                         return -ENODEV;
 549         } else
 550                 return -EINVAL;
 551
 552
 553 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 554         if (tb[IFLA_WIRELESS]) {
 555                 /* Call Wireless Extensions. We need to know the size before
 556                  * we can alloc. Various stuff checked in there... */
 557                 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
 558                                              nla_len(tb[IFLA_WIRELESS]),
 559                                              &iw_buf, &iw_buf_len);
 560                 if (err < 0)
 561                         goto errout;
 562
 563                 iw += IW_EV_POINT_OFF;
 564         }
 565 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 566
 567         payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) +
 568                               nla_total_size(iw_buf_len));
 569         nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL);
 570         if (nskb == NULL) {
 571                 err = -ENOBUFS;
 572                 goto errout;
 573         }
 574
 575         err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
 576                                NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
 577         if (err <= 0) {
 578                 kfree_skb(skb);
 579                 goto errout;
 580         }
 581
 582         err = rtnl_unicast(skb, NETLINK_CB(skb).pid);
 583 errout:
 584         kfree(iw_buf);
 585         dev_put(dev);
 586
 587         return err;
 588 }
 589
 590 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 591 {
 592         int idx;
 593         int s_idx = cb->family;
 594
 595         if (s_idx == 0)
 596                 s_idx = 1;
 597         for (idx=1; idx<NPROTO; idx++) {
 598                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 599                 if (idx < s_idx || idx == PF_PACKET)
 600                         continue;
 601                 if (rtnetlink_links[idx] == NULL ||
 602                     rtnetlink_links[idx][type].dumpit == NULL)
 603                         continue;
 604                 if (idx > s_idx)
 605                         memset(&cb->args[0], 0, sizeof(cb->args));
 606                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 607                         break;
 608         }
 609         cb->family = idx;
 610
 611         return skb->len;
 612 }
 613
 614 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 615 {
 616         struct sk_buff *skb;
 617         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
 618                                sizeof(struct rtnl_link_ifmap) +
 619                                sizeof(struct rtnl_link_stats) + 128);
 620
 621         skb = nlmsg_new(size, GFP_KERNEL);
 622         if (!skb)
 623                 return;
 624
 625         if (rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0) < 0) {
 626                 kfree_skb(skb);
 627                 return;
 628         }
 629         NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
 630         netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
 631 }
 632
 633 /* Protected by RTNL sempahore.  */
 634 static struct rtattr **rta_buf;
 635 static int rtattr_max;
 636
 637 /* Process one rtnetlink message. */
 638
 639 static __inline__ int
 640 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 641 {
 642         struct rtnetlink_link *link;
 643         struct rtnetlink_link *link_tab;
 644         int sz_idx, kind;
 645         int min_len;
 646         int family;
 647         int type;
 648         int err;
 649
 650         /* Only requests are handled by kernel now */
 651         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 652                 return 0;
 653
 654         type = nlh->nlmsg_type;
 655
 656         /* A control message: ignore them */
 657         if (type < RTM_BASE)
 658                 return 0;
 659
 660         /* Unknown message: reply with EINVAL */
 661         if (type > RTM_MAX)
 662                 goto err_inval;
 663
 664         type -= RTM_BASE;
 665
 666         /* All the messages must have at least 1 byte length */
 667         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
 668                 return 0;
 669
 670         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
 671         if (family >= NPROTO) {
 672                 *errp = -EAFNOSUPPORT;
 673                 return -1;
 674         }
 675
 676         link_tab = rtnetlink_links[family];
 677         if (link_tab == NULL)
 678                 link_tab = rtnetlink_links[PF_UNSPEC];
 679         link = &link_tab[type];
 680
 681         sz_idx = type>>2;
 682         kind = type&3;
 683
 684         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
 685                 *errp = -EPERM;
 686                 return -1;
 687         }
 688
 689         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 690                 if (link->dumpit == NULL)
 691                         link = &(rtnetlink_links[PF_UNSPEC][type]);
 692
 693                 if (link->dumpit == NULL)
 694                         goto err_inval;
 695
 696                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
 697                                                 link->dumpit, NULL)) != 0) {
 698                         return -1;
 699                 }
 700
 701                 netlink_queue_skip(nlh, skb);
 702                 return -1;
 703         }
 704
 705         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
 706
 707         min_len = rtm_min[sz_idx];
 708         if (nlh->nlmsg_len < min_len)
 709                 goto err_inval;
 710
 711         if (nlh->nlmsg_len > min_len) {
 712                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
 713                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
 714
 715                 while (RTA_OK(attr, attrlen)) {
 716                         unsigned flavor = attr->rta_type;
 717                         if (flavor) {
 718                                 if (flavor > rta_max[sz_idx])
 719                                         goto err_inval;
 720                                 rta_buf[flavor-1] = attr;
 721                         }
 722                         attr = RTA_NEXT(attr, attrlen);
 723                 }
 724         }
 725
 726         if (link->doit == NULL)
 727                 link = &(rtnetlink_links[PF_UNSPEC][type]);
 728         if (link->doit == NULL)
 729                 goto err_inval;
 730         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
 731
 732         *errp = err;
 733         return err;
 734
 735 err_inval:
 736         *errp = -EINVAL;
 737         return -1;
 738 }
 739
 740 static void rtnetlink_rcv(struct sock *sk, int len)
 741 {
 742         unsigned int qlen = 0;
 743
 744         do {
 745                 mutex_lock(&rtnl_mutex);
 746                 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
 747                 mutex_unlock(&rtnl_mutex);
 748
 749                 netdev_run_todo();
 750         } while (qlen);
 751 }
 752
 753 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 754 {
 755         [RTM_GETLINK     - RTM_BASE] = { .doit   = rtnl_getlink,
 756                                          .dumpit = rtnl_dump_ifinfo      },
 757         [RTM_SETLINK     - RTM_BASE] = { .doit   = rtnl_setlink          },
 758         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 759         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 760         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
 761         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
 762         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
 763 #ifdef CONFIG_FIB_RULES
 764         [RTM_NEWRULE     - RTM_BASE] = { .doit   = fib_nl_newrule        },
 765         [RTM_DELRULE     - RTM_BASE] = { .doit   = fib_nl_delrule        },
 766 #endif
 767         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnl_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);
 831 EXPORT_SYMBOL(rtnl_unicast);