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 static struct sock *rtnl;
  62
  63 void rtnl_lock(void)
  64 {
  65         mutex_lock(&rtnl_mutex);
  66 }
  67
  68 void __rtnl_unlock(void)
  69 {
  70         mutex_unlock(&rtnl_mutex);
  71 }
  72
  73 void rtnl_unlock(void)
  74 {
  75         mutex_unlock(&rtnl_mutex);
  76         if (rtnl && rtnl->sk_receive_queue.qlen)
  77                 rtnl->sk_data_ready(rtnl, 0);
  78         netdev_run_todo();
  79 }
  80
  81 int rtnl_trylock(void)
  82 {
  83         return mutex_trylock(&rtnl_mutex);
  84 }
  85
  86 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
  87 {
  88         memset(tb, 0, sizeof(struct rtattr*)*maxattr);
  89
  90         while (RTA_OK(rta, len)) {
  91                 unsigned flavor = rta->rta_type;
  92                 if (flavor && flavor <= maxattr)
  93                         tb[flavor-1] = rta;
  94                 rta = RTA_NEXT(rta, len);
  95         }
  96         return 0;
  97 }
  98
  99 struct rtnetlink_link * rtnetlink_links[NPROTO];
 100
 101 static const int rtm_min[RTM_NR_FAMILIES] =
 102 {
 103         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 104         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
 105         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
 106         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
 107         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
 108         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
 109         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
 110         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
 111         [RTM_FAM(RTM_NEWPREFIX)]    = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 112         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 113         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
 114 };
 115
 116 static const int rta_max[RTM_NR_FAMILIES] =
 117 {
 118         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
 119         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
 120         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
 121         [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
 122         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
 123         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
 124         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
 125         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
 126 };
 127
 128 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
 129 {
 130         struct rtattr *rta;
 131         int size = RTA_LENGTH(attrlen);
 132
 133         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
 134         rta->rta_type = attrtype;
 135         rta->rta_len = size;
 136         memcpy(RTA_DATA(rta), data, attrlen);
 137         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 138 }
 139
 140 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
 141 {
 142         size_t ret = RTA_PAYLOAD(rta);
 143         char *src = RTA_DATA(rta);
 144
 145         if (ret > 0 && src[ret - 1] == '\0')
 146                 ret--;
 147         if (size > 0) {
 148                 size_t len = (ret >= size) ? size - 1 : ret;
 149                 memset(dest, 0, size);
 150                 memcpy(dest, src, len);
 151         }
 152         return ret;
 153 }
 154
 155 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
 156 {
 157         int err = 0;
 158
 159         NETLINK_CB(skb).dst_group = group;
 160         if (echo)
 161                 atomic_inc(&skb->users);
 162         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 163         if (echo)
 164                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 165         return err;
 166 }
 167
 168 int rtnl_unicast(struct sk_buff *skb, u32 pid)
 169 {
 170         return nlmsg_unicast(rtnl, skb, pid);
 171 }
 172
 173 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
 174                 struct nlmsghdr *nlh, gfp_t flags)
 175 {
 176         int report = 0;
 177
 178         if (nlh)
 179                 report = nlmsg_report(nlh);
 180
 181         return nlmsg_notify(rtnl, skb, pid, group, report, flags);
 182 }
 183
 184 void rtnl_set_sk_err(u32 group, int error)
 185 {
 186         netlink_set_err(rtnl, 0, group, error);
 187 }
 188
 189 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 190 {
 191         struct rtattr *mx = (struct rtattr*)skb->tail;
 192         int i;
 193
 194         RTA_PUT(skb, RTA_METRICS, 0, NULL);
 195         for (i=0; i<RTAX_MAX; i++) {
 196                 if (metrics[i])
 197                         RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
 198         }
 199         mx->rta_len = skb->tail - (u8*)mx;
 200         if (mx->rta_len == RTA_LENGTH(0))
 201                 skb_trim(skb, (u8*)mx - skb->data);
 202         return 0;
 203
 204 rtattr_failure:
 205         skb_trim(skb, (u8*)mx - skb->data);
 206         return -1;
 207 }
 208
 209
 210 static void set_operstate(struct net_device *dev, unsigned char transition)
 211 {
 212         unsigned char operstate = dev->operstate;
 213
 214         switch(transition) {
 215         case IF_OPER_UP:
 216                 if ((operstate == IF_OPER_DORMANT ||
 217                      operstate == IF_OPER_UNKNOWN) &&
 218                     !netif_dormant(dev))
 219                         operstate = IF_OPER_UP;
 220                 break;
 221
 222         case IF_OPER_DORMANT:
 223                 if (operstate == IF_OPER_UP ||
 224                     operstate == IF_OPER_UNKNOWN)
 225                         operstate = IF_OPER_DORMANT;
 226                 break;
 227         };
 228
 229         if (dev->operstate != operstate) {
 230                 write_lock_bh(&dev_base_lock);
 231                 dev->operstate = operstate;
 232                 write_unlock_bh(&dev_base_lock);
 233                 netdev_state_change(dev);
 234         }
 235 }
 236
 237 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 238                                  struct net_device_stats *b)
 239 {
 240         a->rx_packets = b->rx_packets;
 241         a->tx_packets = b->tx_packets;
 242         a->rx_bytes = b->rx_bytes;
 243         a->tx_bytes = b->tx_bytes;
 244         a->rx_errors = b->rx_errors;
 245         a->tx_errors = b->tx_errors;
 246         a->rx_dropped = b->rx_dropped;
 247         a->tx_dropped = b->tx_dropped;
 248
 249         a->multicast = b->multicast;
 250         a->collisions = b->collisions;
 251
 252         a->rx_length_errors = b->rx_length_errors;
 253         a->rx_over_errors = b->rx_over_errors;
 254         a->rx_crc_errors = b->rx_crc_errors;
 255         a->rx_frame_errors = b->rx_frame_errors;
 256         a->rx_fifo_errors = b->rx_fifo_errors;
 257         a->rx_missed_errors = b->rx_missed_errors;
 258
 259         a->tx_aborted_errors = b->tx_aborted_errors;
 260         a->tx_carrier_errors = b->tx_carrier_errors;
 261         a->tx_fifo_errors = b->tx_fifo_errors;
 262         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 263         a->tx_window_errors = b->tx_window_errors;
 264
 265         a->rx_compressed = b->rx_compressed;
 266         a->tx_compressed = b->tx_compressed;
 267 };
 268
 269 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 270                             void *iwbuf, int iwbuflen, int type, u32 pid,
 271                             u32 seq, u32 change, unsigned int flags)
 272 {
 273         struct ifinfomsg *ifm;
 274         struct nlmsghdr *nlh;
 275
 276         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
 277         if (nlh == NULL)
 278                 return -ENOBUFS;
 279
 280         ifm = nlmsg_data(nlh);
 281         ifm->ifi_family = AF_UNSPEC;
 282         ifm->__ifi_pad = 0;
 283         ifm->ifi_type = dev->type;
 284         ifm->ifi_index = dev->ifindex;
 285         ifm->ifi_flags = dev_get_flags(dev);
 286         ifm->ifi_change = change;
 287
 288         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
 289         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
 290         NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
 291         NLA_PUT_U8(skb, IFLA_OPERSTATE,
 292                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
 293         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
 294         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
 295
 296         if (dev->ifindex != dev->iflink)
 297                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
 298
 299         if (dev->master)
 300                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
 301
 302         if (dev->qdisc_sleeping)
 303                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
 304
 305         if (1) {
 306                 struct rtnl_link_ifmap map = {
 307                         .mem_start   = dev->mem_start,
 308                         .mem_end     = dev->mem_end,
 309                         .base_addr   = dev->base_addr,
 310                         .irq         = dev->irq,
 311                         .dma         = dev->dma,
 312                         .port        = dev->if_port,
 313                 };
 314                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
 315         }
 316
 317         if (dev->addr_len) {
 318                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
 319                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
 320         }
 321
 322         if (dev->get_stats) {
 323                 struct net_device_stats *stats = dev->get_stats(dev);
 324                 if (stats) {
 325                         struct nlattr *attr;
 326
 327                         attr = nla_reserve(skb, IFLA_STATS,
 328                                            sizeof(struct rtnl_link_stats));
 329                         if (attr == NULL)
 330                                 goto nla_put_failure;
 331
 332                         copy_rtnl_link_stats(nla_data(attr), stats);
 333                 }
 334         }
 335
 336         if (iwbuf)
 337                 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
 338
 339         return nlmsg_end(skb, nlh);
 340
 341 nla_put_failure:
 342         return nlmsg_cancel(skb, nlh);
 343 }
 344
 345 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 346 {
 347         int idx;
 348         int s_idx = cb->args[0];
 349         struct net_device *dev;
 350
 351         read_lock(&dev_base_lock);
 352         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
 353                 if (idx < s_idx)
 354                         continue;
 355                 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
 356                                      NETLINK_CB(cb->skb).pid,
 357                                      cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
 358                         break;
 359         }
 360         read_unlock(&dev_base_lock);
 361         cb->args[0] = idx;
 362
 363         return skb->len;
 364 }
 365
 366 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
 367         [IFLA_IFNAME]           = { .type = NLA_STRING },
 368         [IFLA_MAP]              = { .minlen = sizeof(struct rtnl_link_ifmap) },
 369         [IFLA_MTU]              = { .type = NLA_U32 },
 370         [IFLA_TXQLEN]           = { .type = NLA_U32 },
 371         [IFLA_WEIGHT]           = { .type = NLA_U32 },
 372         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
 373         [IFLA_LINKMODE]         = { .type = NLA_U8 },
 374 };
 375
 376 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 377 {
 378         struct ifinfomsg *ifm;
 379         struct net_device *dev;
 380         int err, send_addr_notify = 0, modified = 0;
 381         struct nlattr *tb[IFLA_MAX+1];
 382         char ifname[IFNAMSIZ];
 383
 384         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 385         if (err < 0)
 386                 goto errout;
 387
 388         if (tb[IFLA_IFNAME] &&
 389             nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ) >= IFNAMSIZ)
 390                 return -EINVAL;
 391
 392         err = -EINVAL;
 393         ifm = nlmsg_data(nlh);
 394         if (ifm->ifi_index >= 0)
 395                 dev = dev_get_by_index(ifm->ifi_index);
 396         else if (tb[IFLA_IFNAME])
 397                 dev = dev_get_by_name(ifname);
 398         else
 399                 goto errout;
 400
 401         if (dev == NULL) {
 402                 err = -ENODEV;
 403                 goto errout;
 404         }
 405
 406         if (tb[IFLA_ADDRESS] &&
 407             nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
 408                 goto errout_dev;
 409
 410         if (tb[IFLA_BROADCAST] &&
 411             nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
 412                 goto errout_dev;
 413
 414         if (tb[IFLA_MAP]) {
 415                 struct rtnl_link_ifmap *u_map;
 416                 struct ifmap k_map;
 417
 418                 if (!dev->set_config) {
 419                         err = -EOPNOTSUPP;
 420                         goto errout_dev;
 421                 }
 422
 423                 if (!netif_device_present(dev)) {
 424                         err = -ENODEV;
 425                         goto errout_dev;
 426                 }
 427
 428                 u_map = nla_data(tb[IFLA_MAP]);
 429                 k_map.mem_start = (unsigned long) u_map->mem_start;
 430                 k_map.mem_end = (unsigned long) u_map->mem_end;
 431                 k_map.base_addr = (unsigned short) u_map->base_addr;
 432                 k_map.irq = (unsigned char) u_map->irq;
 433                 k_map.dma = (unsigned char) u_map->dma;
 434                 k_map.port = (unsigned char) u_map->port;
 435
 436                 err = dev->set_config(dev, &k_map);
 437                 if (err < 0)
 438                         goto errout_dev;
 439
 440                 modified = 1;
 441         }
 442
 443         if (tb[IFLA_ADDRESS]) {
 444                 struct sockaddr *sa;
 445                 int len;
 446
 447                 if (!dev->set_mac_address) {
 448                         err = -EOPNOTSUPP;
 449                         goto errout_dev;
 450                 }
 451
 452                 if (!netif_device_present(dev)) {
 453                         err = -ENODEV;
 454                         goto errout_dev;
 455                 }
 456
 457                 len = sizeof(sa_family_t) + dev->addr_len;
 458                 sa = kmalloc(len, GFP_KERNEL);
 459                 if (!sa) {
 460                         err = -ENOMEM;
 461                         goto errout_dev;
 462                 }
 463                 sa->sa_family = dev->type;
 464                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
 465                        dev->addr_len);
 466                 err = dev->set_mac_address(dev, sa);
 467                 kfree(sa);
 468                 if (err)
 469                         goto errout_dev;
 470                 send_addr_notify = 1;
 471                 modified = 1;
 472         }
 473
 474         if (tb[IFLA_MTU]) {
 475                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
 476                 if (err < 0)
 477                         goto errout_dev;
 478                 modified = 1;
 479         }
 480
 481         /*
 482          * Interface selected by interface index but interface
 483          * name provided implies that a name change has been
 484          * requested.
 485          */
 486         if (ifm->ifi_index >= 0 && ifname[0]) {
 487                 err = dev_change_name(dev, ifname);
 488                 if (err < 0)
 489                         goto errout_dev;
 490                 modified = 1;
 491         }
 492
 493 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 494         if (tb[IFLA_WIRELESS]) {
 495                 /* Call Wireless Extensions.
 496                  * Various stuff checked in there... */
 497                 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
 498                                              nla_len(tb[IFLA_WIRELESS]));
 499                 if (err < 0)
 500                         goto errout_dev;
 501         }
 502 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 503
 504         if (tb[IFLA_BROADCAST]) {
 505                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
 506                 send_addr_notify = 1;
 507         }
 508
 509
 510         if (ifm->ifi_flags)
 511                 dev_change_flags(dev, ifm->ifi_flags);
 512
 513         if (tb[IFLA_TXQLEN])
 514                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
 515
 516         if (tb[IFLA_WEIGHT])
 517                 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
 518
 519         if (tb[IFLA_OPERSTATE])
 520                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 521
 522         if (tb[IFLA_LINKMODE]) {
 523                 write_lock_bh(&dev_base_lock);
 524                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
 525                 write_unlock_bh(&dev_base_lock);
 526         }
 527
 528         err = 0;
 529
 530 errout_dev:
 531         if (err < 0 && modified && net_ratelimit())
 532                 printk(KERN_WARNING "A link change request failed with "
 533                        "some changes comitted already. Interface %s may "
 534                        "have been left with an inconsistent configuration, "
 535                        "please check.\n", dev->name);
 536
 537         if (send_addr_notify)
 538                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 539
 540         dev_put(dev);
 541 errout:
 542         return err;
 543 }
 544
 545 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 546 {
 547         struct ifinfomsg *ifm;
 548         struct nlattr *tb[IFLA_MAX+1];
 549         struct net_device *dev = NULL;
 550         struct sk_buff *nskb;
 551         char *iw_buf = NULL, *iw = NULL;
 552         int iw_buf_len = 0;
 553         int err, payload;
 554
 555         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
 556         if (err < 0)
 557                 goto errout;
 558
 559         ifm = nlmsg_data(nlh);
 560         if (ifm->ifi_index >= 0) {
 561                 dev = dev_get_by_index(ifm->ifi_index);
 562                 if (dev == NULL)
 563                         return -ENODEV;
 564         } else
 565                 return -EINVAL;
 566
 567
 568 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
 569         if (tb[IFLA_WIRELESS]) {
 570                 /* Call Wireless Extensions. We need to know the size before
 571                  * we can alloc. Various stuff checked in there... */
 572                 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
 573                                              nla_len(tb[IFLA_WIRELESS]),
 574                                              &iw_buf, &iw_buf_len);
 575                 if (err < 0)
 576                         goto errout;
 577
 578                 iw += IW_EV_POINT_OFF;
 579         }
 580 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
 581
 582         payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) +
 583                               nla_total_size(iw_buf_len));
 584         nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL);
 585         if (nskb == NULL) {
 586                 err = -ENOBUFS;
 587                 goto errout;
 588         }
 589
 590         err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
 591                                NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
 592         if (err <= 0) {
 593                 kfree_skb(skb);
 594                 goto errout;
 595         }
 596
 597         err = rtnl_unicast(skb, NETLINK_CB(skb).pid);
 598 errout:
 599         kfree(iw_buf);
 600         dev_put(dev);
 601
 602         return err;
 603 }
 604
 605 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 606 {
 607         int idx;
 608         int s_idx = cb->family;
 609
 610         if (s_idx == 0)
 611                 s_idx = 1;
 612         for (idx=1; idx<NPROTO; idx++) {
 613                 int type = cb->nlh->nlmsg_type-RTM_BASE;
 614                 if (idx < s_idx || idx == PF_PACKET)
 615                         continue;
 616                 if (rtnetlink_links[idx] == NULL ||
 617                     rtnetlink_links[idx][type].dumpit == NULL)
 618                         continue;
 619                 if (idx > s_idx)
 620                         memset(&cb->args[0], 0, sizeof(cb->args));
 621                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
 622                         break;
 623         }
 624         cb->family = idx;
 625
 626         return skb->len;
 627 }
 628
 629 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
 630 {
 631         struct sk_buff *skb;
 632         int err = -ENOBUFS;
 633
 634         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 635         if (skb == NULL)
 636                 goto errout;
 637
 638         err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
 639         if (err < 0) {
 640                 kfree_skb(skb);
 641                 goto errout;
 642         }
 643
 644         err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
 645 errout:
 646         if (err < 0)
 647                 rtnl_set_sk_err(RTNLGRP_LINK, err);
 648 }
 649
 650 /* Protected by RTNL sempahore.  */
 651 static struct rtattr **rta_buf;
 652 static int rtattr_max;
 653
 654 /* Process one rtnetlink message. */
 655
 656 static __inline__ int
 657 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 658 {
 659         struct rtnetlink_link *link;
 660         struct rtnetlink_link *link_tab;
 661         int sz_idx, kind;
 662         int min_len;
 663         int family;
 664         int type;
 665         int err;
 666
 667         /* Only requests are handled by kernel now */
 668         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
 669                 return 0;
 670
 671         type = nlh->nlmsg_type;
 672
 673         /* A control message: ignore them */
 674         if (type < RTM_BASE)
 675                 return 0;
 676
 677         /* Unknown message: reply with EINVAL */
 678         if (type > RTM_MAX)
 679                 goto err_inval;
 680
 681         type -= RTM_BASE;
 682
 683         /* All the messages must have at least 1 byte length */
 684         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
 685                 return 0;
 686
 687         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
 688         if (family >= NPROTO) {
 689                 *errp = -EAFNOSUPPORT;
 690                 return -1;
 691         }
 692
 693         link_tab = rtnetlink_links[family];
 694         if (link_tab == NULL)
 695                 link_tab = rtnetlink_links[PF_UNSPEC];
 696         link = &link_tab[type];
 697
 698         sz_idx = type>>2;
 699         kind = type&3;
 700
 701         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
 702                 *errp = -EPERM;
 703                 return -1;
 704         }
 705
 706         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
 707                 if (link->dumpit == NULL)
 708                         link = &(rtnetlink_links[PF_UNSPEC][type]);
 709
 710                 if (link->dumpit == NULL)
 711                         goto err_inval;
 712
 713                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
 714                                                 link->dumpit, NULL)) != 0) {
 715                         return -1;
 716                 }
 717
 718                 netlink_queue_skip(nlh, skb);
 719                 return -1;
 720         }
 721
 722         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
 723
 724         min_len = rtm_min[sz_idx];
 725         if (nlh->nlmsg_len < min_len)
 726                 goto err_inval;
 727
 728         if (nlh->nlmsg_len > min_len) {
 729                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
 730                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
 731
 732                 while (RTA_OK(attr, attrlen)) {
 733                         unsigned flavor = attr->rta_type;
 734                         if (flavor) {
 735                                 if (flavor > rta_max[sz_idx])
 736                                         goto err_inval;
 737                                 rta_buf[flavor-1] = attr;
 738                         }
 739                         attr = RTA_NEXT(attr, attrlen);
 740                 }
 741         }
 742
 743         if (link->doit == NULL)
 744                 link = &(rtnetlink_links[PF_UNSPEC][type]);
 745         if (link->doit == NULL)
 746                 goto err_inval;
 747         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
 748
 749         *errp = err;
 750         return err;
 751
 752 err_inval:
 753         *errp = -EINVAL;
 754         return -1;
 755 }
 756
 757 static void rtnetlink_rcv(struct sock *sk, int len)
 758 {
 759         unsigned int qlen = 0;
 760
 761         do {
 762                 mutex_lock(&rtnl_mutex);
 763                 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
 764                 mutex_unlock(&rtnl_mutex);
 765
 766                 netdev_run_todo();
 767         } while (qlen);
 768 }
 769
 770 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
 771 {
 772         [RTM_GETLINK     - RTM_BASE] = { .doit   = rtnl_getlink,
 773                                          .dumpit = rtnl_dump_ifinfo      },
 774         [RTM_SETLINK     - RTM_BASE] = { .doit   = rtnl_setlink          },
 775         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 776         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 777         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
 778         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
 779         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
 780 #ifdef CONFIG_FIB_RULES
 781         [RTM_NEWRULE     - RTM_BASE] = { .doit   = fib_nl_newrule        },
 782         [RTM_DELRULE     - RTM_BASE] = { .doit   = fib_nl_delrule        },
 783 #endif
 784         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
 785         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
 786         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
 787 };
 788
 789 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 790 {
 791         struct net_device *dev = ptr;
 792         switch (event) {
 793         case NETDEV_UNREGISTER:
 794                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 795                 break;
 796         case NETDEV_REGISTER:
 797                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
 798                 break;
 799         case NETDEV_UP:
 800         case NETDEV_DOWN:
 801                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
 802                 break;
 803         case NETDEV_CHANGE:
 804         case NETDEV_GOING_DOWN:
 805                 break;
 806         default:
 807                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
 808                 break;
 809         }
 810         return NOTIFY_DONE;
 811 }
 812
 813 static struct notifier_block rtnetlink_dev_notifier = {
 814         .notifier_call  = rtnetlink_event,
 815 };
 816
 817 void __init rtnetlink_init(void)
 818 {
 819         int i;
 820
 821         rtattr_max = 0;
 822         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
 823                 if (rta_max[i] > rtattr_max)
 824                         rtattr_max = rta_max[i];
 825         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
 826         if (!rta_buf)
 827                 panic("rtnetlink_init: cannot allocate rta_buf\n");
 828
 829         rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
 830                                      THIS_MODULE);
 831         if (rtnl == NULL)
 832                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
 833         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
 834         register_netdevice_notifier(&rtnetlink_dev_notifier);
 835         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
 836         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
 837 }
 838
 839 EXPORT_SYMBOL(__rta_fill);
 840 EXPORT_SYMBOL(rtattr_strlcpy);
 841 EXPORT_SYMBOL(rtattr_parse);
 842 EXPORT_SYMBOL(rtnetlink_links);
 843 EXPORT_SYMBOL(rtnetlink_put_metrics);
 844 EXPORT_SYMBOL(rtnl_lock);
 845 EXPORT_SYMBOL(rtnl_trylock);
 846 EXPORT_SYMBOL(rtnl_unlock);
 847 EXPORT_SYMBOL(rtnl_unicast);
 848 EXPORT_SYMBOL(rtnl_notify);
 849 EXPORT_SYMBOL(rtnl_set_sk_err);